Ring Die Pellet Machine


Ring die pellet machine has the advantages of high efficiency, energy saving, environmental protection, easy operation and low maintenance cost.

It is mainly used in animal feed industry, biomass energy industry and organic fertilizer industry, etc. Especially in the field of biomass pellet fuel, ring die pellet mill has a wide range of application prospects.

The ring die pellet machines we can provide include: ring die feed pellet machine, ring die wood pellet machine, ring die biomass pellet machine, ring die organic fertilizer pellet machine, ring die cat litter pellet machine…


Ring Die Pellet Machine

What is ring die pellet machine?

What is ring die pellet machine

Ring die pellet making machine is the most widely used pellet mill, no one else.

Ring die pellet machine is the main mechanical equipment for producing feed pellets, wood pellets, biomass pellets, straw pellets, grass pellets, organic fertilizer pellets, cat litter pellets and other types of pellets.

Its performance largely determines the processing output of pellets and occupies a very important position in the pellet processing process.

Ring die pellet presses are widely used in animal feed production lines, wood pellet production lines, biomass pellet production lines, poultry feed production lines, livestock feed production lines, cattle feed production lines, fish feed production lines, organic fertilizer production projects, cat litter production lines, etc.

RICHI Machinery, as a company specializing in pellet machine manufacturing, has produced pellet mills that are favored by the market for their high efficiency, high output and high cost performance.

Types of ring die pellet machines

According to the purpose of the ring die pellet machine, it can be divided into two types: ring die feed pellet machine and ring die wood pellet machine.

Ring die feed pellet machine for sale

Ring die feed pellet machine

  • Model: SZLH
  • Output: 1-42T/H (single machine)
  • Application: animal feed mill plant, poultry feed plant, aqua feed mill, cattle feed mill, chicken feed mill plant, sheep feed mill, pig feed mill, cat litter factory, etc.
  • Types of pellets that can be pressed: various livestock and poultry feed pellets, fish feed pellets, shrimp feed pellets, fermented feed pellets, alfalfa pellets, grass feed pellets, tofu cat litter pellets, cassava pellets, bentonite cat litter pellets, grain pellets, kitchen waste pellets, etc.
ring die wood pellet machine for sale

ring die wood pellet machine

Technical features of ring die pellet machine

  • The main transmission box is a casting with large load-bearing capacity, good stability and long service life.
  • Adopting high-precision aviation-grade gear grinding technology to ensure smooth gear transmission and low noise.
  • The feeding system of this machine is controlled by a stepless frequency conversion motor, which is convenient for speed regulation.
  • Equipped with a safety pin. If the main motor is overloaded, the safety pin breaks and plays an overload protection role.
  • Equipped with 2 cutters, the length of the finished pellets can be effectively controlled.
  • The feeding auger, conditioner and door cover are made of stainless steel to avoid pollution of raw materials due to equipment corrosion and have a longer service life.
  • The main drive also uses high-precision gear rotation, and the ring die adopts a quick-release hoop type.
  • The transmission part of the whole ring die pellet machine uses high-quality imported bearings and oil seals to ensure efficient, stable and low-noise transmission.
  • The internationally advanced level of compensation type serpentine spring coupling has novel structure, compactness, safety and low fault performance.
  • The working strength of the main working parts is strengthened from the material, heat treatment and other processes to meet the pelletizing requirements of pellets.
  • There are many innovative designs on the ring die, which mainly improve the problems of ring die cracking prevention, hourly output increase, and total output increase.
  • Equipped with overload protection device to increase the service life of the equipment.

ring die pellet machine design (structural composition)

The structural design of the ring die pellet machine is very distinctive. The main components of the equipment include feeding system, compression device, ring die, cutting device, discharging system, conditioner, etc.

Feeding system

The feeding system includes feeding port, feeder, pressure regulating mechanism, etc. The raw materials are input through the feed port, and the feeder evenly transports the raw materials to the ring die.

The pressure regulating mechanism adjusts the speed and pressure of the raw materials entering the ring die to control the size and density of the formed pellets.

Compression device

The compression device consists of a main shaft, gears, reducers, bearings, etc. The main shaft rotates through the gears and reducers, driving the ring die to rotate and compressing the raw materials into pellets. At the same time, the compression device is also responsible for applying high pressure to the pellet machine die.

Ring die

The ring die is one of the most critical components in the ring die pellet machine. It consists of a die hole, a die hole thickness adjustment device, and a hardened coating on the inner wall of the die hole.

The size and shape of the die hole determine the size and shape of the formed pellets, and the die hole thickness adjustment device can adjust the thickness of each die hole to control the pellet density.

Cutting device

The cutting device consists of a cutting knife, a cutting knife seat, a spring, etc. When the pellets come out of the ring die, the cutting knife will cut them off in time to ensure the consistency of the pellet size and shape.

Discharging system

The discharging system consists of a discharging port, a piston, a reducer, etc. The compression device compresses the raw material into granules and outputs it through the discharge port. The piston discharges the material during discharge. The reducer controls the speed and stability of the discharge port.

Working principle of ring die pellet machine

Working principle of ring die pellet machine

During operation, the raw material is input through the feeding system and evenly transported to the ring die by the feeder. After the compression device is started, the ring die is driven to rotate through the rotation of the gears and reducer.

At the same time, the compression device applies high pressure to compress the raw material into granules and enter the die hole for molding. After the granules come out of the die hole, they are cut by the cutting device and output through the discharge port.

This is the working principle of the ring die wood pellet mill machine. The working principle of the ring die feed pellet machine is basically the same as it, but it needs to add a conditioning step.

After the raw materials enter the feeding port, they will be matured and gelatinized, and then enter the pelletizing chamber for pelletizing.

Specifications of ring die pellet machine

01 Technical parameters of ring die feed pellet mill

modelSZLH250SZLH320SZLH350SZLH420SZLH508SZLH558SZLH678SZLH768SLZH858
Output (t/h)1~23~45~78~1210~1815~2520~3025~4028~45
Main motor power (kw)223755110160180/200220/250250/280315/355
Main motor series4P
Feeder power (kw)1.11.51.51.52.22.22.22.22.2
Conditioner power (kw)1.52.237.51111111115
Ring die diameter (mm)250320350420508558673762858
Finished pellet diameter (mm)2~12

02 Technical parameters of ring die wood pellet mill

ModelMZLH320MZLH350MZLH420MZLH520MZLH768MZLH858
Output (t/h)0.3~40.5~61.0~102.0~152.5~304~40
Main motor power (kw)223790132250280
Main motor series8P
Ring die diameter (mm)320350420520762858
Finished pellet diameter (mm) 6-12mm

ring die pellet machine projects

ring die pellet mill for sale indonesia

ring die pellet mill for sale indonesia

  • model: MZLH420
  • pellet type: straw wood fuel
  • pellet Size:6-10mm
  • date: 2022.09.27
ring die pellet mill for sale romania

ring die pellet mill for sale romania

  • model: MZLH520
  • pellet type: wood pellets
  • pellet Size: 8mm
  • date: 2022.10.27
ring die pellet mill for sale poland

ring die pellet mill for sale poland

  • model: MZLH520
  • pellet type: Waste tire
  • pellet Size: 3-6mm
  • Date: 2022.12. 06
ring die pellet mill for sale canada

ring die pellet mill for sale canada

  • model: SZLH350
  • pellet type: sawdust pellets
  • pellet Size: 8-10mm
  • Date: 2022.11.06
ring die pellet mill for sale Algeria

ring die pellet mill for sale Algeria

  • model: SZLH420
  • pellet type: chicken feed
  • pellet Size: 2-6mm
  • Date: Sep 31th, 2023
ring die pellet mill for sale Uzbekistan

ring die pellet mill in Uzbekistan

  • model: SZLH508
  • pellet type: cattle & broiler
  • pellet Size: 2-8mm
  • Date: July 1th, 2019
ring die pellet mill for sale Peru

ring die pellet mill for sale Peru

  • model: SZLH350
  • pellet type: poultry feed
  • pellet Size: 3-6mm
  • Date: February 2021
ring die pellet mill for sale Malaysia

ring die pellet mill for sale Malaysia

  • model: SZLH350
  • pellet type: chicken feed
  • pellet Size: 2-4mm
  • Date: October 29, 2021
ring die pellet mill in El Salvador

ring die pellet mill in El Salvador

  • model: SZLH350
  • pellet type: grass feed
  • pellet Size: 4-8mm
  • date: 2022. 09.13
ring die pellet mill for sale Thailand

ring die pellet mill for sale Thailand

  • model: SZLH508
  • pellet type: straw feed
  • pellet Size: 5-8mm
  • date: 2021. 07. 22
ring die pellet mill for sale Vietnam

ring die pellet mill for sale Vietnam

  • model: SZLH678
  • pellet type: compound feed
  • pellet Size: 2-6mm
  • Date: June 2019
ring die pellet mill for sale russia

ring die pellet mill for sale russia

  • model: SZLH678
  • pellet type: alfalfa pellets
  • pellet Size: 4-8mm
  • Date: December 2022
small ring die pellet mill in Nigeria

small ring die pellet mill in Nigeria

  • model: SZLH250
  • pellet type: chicken feed
  • pellet Size:2-4mm
  • Date: June 30, 2020
ring die pellet mill for sale Afghanistan

ring die pellet mill in Afghanistan

  • model: SZLH558
  • pellet type: livestock feed
  • pellet Size: 2-8mm
  • Date: December 2020
ring die pellet mill for sale Kazakhstan

ring die pellet mill in Kazakhstan

  • model: SZLH320
  • pellet type: ruminant feed
  • pellet Size: 4-10mm
  • date: 2022.06.09
ring die pellet mill for sale Angola

ring die pellet mill for sale Angola

  • model: SZLH420
  • pellet type: poultry & cattle
  • pellet Size: 2-8mm
  • Project date: 2023.09.13

Faqs of ring die pellet machine

Q-ico

What’s the Ring die pellet mill price?

The ring die pellet machine cost is generally between 7,000 and 100,000 USD.

The factors that affect the price of a ring die granulator include the following:

1. Equipment price

The price of the ring die pellet machine itself is an important factor in the cost of the equipment. The prices of equipment of different types and brands vary greatly, and the quality and stability of performance are also factors that directly affect the cost of the equipment.

Some high-end equipment is expensive, but has a long service life and relatively low maintenance costs. Therefore, when purchasing equipment, factors such as the service life and maintenance costs of the equipment should be considered, and the purchase cost and subsequent maintenance costs of the equipment should be considered comprehensively.

2. Equipment maintenance and maintenance costs

In addition to the price of the ring die pellet machine itself, the maintenance and maintenance costs of the equipment will also affect the total cost of the equipment. The maintenance and maintenance costs of the equipment include equipment repair costs and regular equipment maintenance costs.

The parts and materials used in some high-end equipment are expensive, and the cost of repairing and replacing parts will also increase accordingly. Therefore, when purchasing equipment, it is necessary to consider the maintenance and maintenance costs of the equipment and choose reliable manufacturers and equipment.

3. Energy consumption of equipment

The energy consumption of the ring die pellet machine will also affect the cost. The energy consumption of equipment of different types and brands varies greatly. Although some high-efficiency equipment is more expensive, it can save energy and reduce energy waste during use. In the long run, it can save costs and improve benefits.

4. Efficiency of equipment

The impact of the efficiency of the ring die pellet mill on the cost cannot be ignored. The efficiency of the equipment is high, and the work efficiency will be relatively improved, which can complete the production tasks faster, thereby improving production benefits and reducing production costs.

Therefore, when purchasing equipment, it is necessary to comprehensively consider the efficiency and cost of the equipment and choose efficient equipment.

Q-ico

What are the differences between horizontal ring die pellet machine and vertical ring die pellet mills?

Generally speaking, only when processing wood biomass pellets is it necessary to compare horizontal ring die pelletizers and vertical ring die pelletizers. These are two models with similar working principles.

01 Origin

The origin of the horizontal pelletizer is much earlier than that of the vertical pelletizer. The technology is mature and stable. World-renowned pelletizer manufacturers such as CPM, Buhler, and Andrit all adopt horizontal structure design.

The horizontal ring die pellet machine originated in 1883, and the vertical ring die pellet machine originated in Shandong Province, China in the past decade. Compared with the vertical pelletizer, the horizontal pelletizer has a longer service life and higher stability.

02 Raw material applicability

The horizontal pelletizer has large torque, low-speed output, and wide applicability to raw materials. It can be used for raw materials with high moisture, uneven thickness, and complex types. The vertical ring die pellet mill is somewhat “picky” about raw materials.

03 Sealing

The pelletizing chamber of the horizontal pelletizer adopts a sealed structure, and all raw material dust is isolated in the closed space of the ring die to prevent ash leakage.

The main shaft of the vertical pellet machine is installed vertically, and the dust raw material is in direct contact with the transmission mechanism, which increases the wear of the transmission mechanism.

04 Granulation quality

The horizontal pellet machine has a large mass of driving wheel and ring die, which generates a large torque on the material when rotating around the axis. During the molding process, the material is molded at high speed and high pressure to obtain high-quality pellets.

The vertical ring die pellet mill uses a pressure roller to directly carry the load, which is light in weight, small in relative rotational inertia, slow in pressing speed, and the molding effect is slightly worse than the horizontal type.

05 Parts replacement and blockage maintenance

The door cover of the horizontal pellet machine is opened from the side, which is convenient for replacing wearing parts. The main shaft must be removed to disassemble the vertical ring die pellet machine, which is troublesome to maintain.

When the horizontal type encounters material blockage or suffocation, just turn off the machine and open the door cover to clean it. The vertical ring die pellet machine must remove all the mechanisms above the ring die to clean it.

In addition, the horizontal pellet machine has an overload protection device that can respond quickly to protect the motor and transmission parts, while the vertical type does not.

06 Granulation and molding

The feeding method of the horizontal pellet machine is to equip it with a forced feeding device, which can force the material into the pelletizing chamber to increase the filling rate of the pelletizing chamber. The material is easy to form, and the vertical ring die pellet mill relies on the material’s own weight to fall into the pelletizing chamber.

If the auxiliary materials are uneven or the thickness of the materials varies greatly, the heavy materials will sink to the bottom first, and the light materials will always float on the top, which will eventually make the material difficult to form.

07 Service life

The temperature inside the pelletizing chamber of the closed horizontal pellet machine is high, causing frequent damage to the ring die bearing. The roller of the vertical ring die pellet machine is installed vertically, and due to neutral reasons, the bearings often burn out due to lack of oil.

Q-ico

What are the differences between the ring die pellet machine and the flat die pellet machine?

The ring die pellet machine and the flat die pelletizer are two completely different models. In the field of commercial pellet processing, the ring die pelletizer is always the best choice.

In comparison, the flat die pelletizer is only suitable for very small farm applications because the output of this type of equipment is very low. This is originally a device specially designed for small or mini scale.

If you have a small farm or want to process wood stove pellets for your own use, it is certainly a better option to choose a flat die pellet mill. For this type of pellet processor, it is unnecessary to choose a ring die pellet mill.

No matter how the pellet mill manufacturer promotes, as long as the pellet output you want to process (feed processing is greater than 1t/h, wood chip biomass pellet output is greater than 0.3t/h), and you have quality requirements for the pellets to be processed, you can directly exclude the flat die pellet mill as an option.

Because whether it is output or pellet quality, the flat die pellet mill cannot be compared with the ring die pellet machine at all.

Q-ico

How to choose a suitable ring die pellet machine manufacturer for yourself? What factors should be considered?

1. Clear business needs and budget

Before choosing a ring die pellet mill, you should have a clear understanding of your business needs and budget.

This includes the type of pellets to be processed, the type of raw materials to be pelletized, the power of the equipment, and the size of the pellets. After understanding this information, you can more accurately find a manufacturer that suits your needs.

2. Preliminary selection of manufacturers

Based on market research and peer recommendations, select several manufacturers with strength and scale for inspection. Specifically include production scale, delivery cycle, transaction method, delivery instructions, training method, after-sales matters and other details.

3. Inspect the performance and configuration

When inspecting the ring die granulator manufacturer, you need to pay attention to important accessories such as bearings, ring dies, rollers, motors, cutters, and the brands of these accessories.

These parts directly affect the output and pelletizing effect of the ring die pelleting machine, and the prices of different brands are also very different. Avoid being deceived by bad manufacturers using domestic accessories to impersonate imported accessories.

4. Pay attention to the strength and experience of the manufacturer

A strong manufacturer usually has a standardized production workshop, many years of production experience and continuous research and development capabilities. These factors can guarantee the quality and performance of the ring die pellet machine. When choosing a  manufacturer, be sure to pay attention to their strength and experience.

5. Understand the processing technology

The processing technology of the ring die pellet machine is closely related to factors such as lasers and power. When choosing a manufacturer, understand their processing technology and equipment configuration.

In addition, the proficiency of the operator will also affect the performance of the ring die pellet mill, so the manufacturer should provide professional training and technical support.

6. Pay attention to the after-sales service system

A perfect after-sales service system is an important guarantee for the rights and interests of users. A powerful ring die pellet machine manufacturer will provide customers with one-stop after-sales service from the user’s perspective, including equipment installation, commissioning, training, repair and maintenance. When choosing a manufacturer, do not ignore the importance of after-sales service.

In short, when choosing a manufacturer that suits you, you should consider it comprehensively from many aspects such as demand, budget, manufacturer strength, equipment performance, processing technology and after-sales service. I hope this article can provide you with some useful suggestions and references when choosing a ring die pellet mill manufacturer.

7. Understand customer evaluation and word of mouth

When choosing a manufacturer, it is also very important to understand other customers’ evaluation and word of mouth about the manufacturer.

You can learn about the performance and service quality of the manufacturer from peers, friends, or forums, social media and other platforms on the Internet. This will help you more accurately evaluate the level and reputation of the manufacturer.

8. On-site visits and actual operation

Before purchasing a ring die pellet machine, you can ask the manufacturer to arrange for you to visit the site and observe the actual operation process of the ring die pellet mill.

In this way, you can more intuitively understand the performance, stability and ease of operation of the equipment. If possible, try to operate the equipment and conduct actual pelletizing tests to ensure that the purchased ring die pellet machine can meet your needs.

9. Compare quotations and comprehensive cost performance

After collecting quotations from multiple ring die pellet machine manufacturers, you can make a comprehensive comparison, weighing factors such as equipment performance, brand, after-sales service, and choose the one with the highest cost performance.

Please note that you should not blindly pursue low prices, because too low prices may mean unreliable equipment quality and after-sales service.

10. Sign a contract and ensure relevant terms

After determining the manufacturer to purchase the ring die pellet mill, sign a formal contract and ensure that the relevant terms are clear. These terms should include detailed specifications of the equipment, price, delivery period, payment method, after-sales service, etc. Before signing the contract, be sure to read it carefully to ensure that your rights and interests are protected.

By considering the above aspects, you can more confidently choose a ring die pellet machine manufacturer that suits your needs. I hope you can find a suitable partner to provide strong support for your business development.

Q-ico

How to choose a pellet machine ring die?

Speaking of the pelletizing industry, excessive wear and tear of ring die pellet machine accessories is a long-standing problem for enterprises, among which the loss of ring die accounts for 25%-30% of the production workshop cost.

Since the ring die is porous and thin-walled, its quality will seriously affect the output, production efficiency and quality of finished pellets of the pellet machine. If you want to reduce production costs and improve pellet quality, you must select the right ring die parameters for the pressed raw materials and use high-quality ring dies.

What factors should be considered when buying a ring die? When choosing a pellet machine ring die, RICHI Machinery recommends that you consider the following factors:

1. Ring die material

Since the pellet mill ring die is subjected to greater pressure and wear during processing, its material should have high strength, high hardness and wear resistance.

Most high-quality ring dies on the market are made of alloy steel or stainless steel to ensure that the ring die maintains stable performance and a longer service life during long-term use. Alloy steel ring dies have higher hardness and strength, and are suitable for producing large-size, high-yield pellet products.

Stainless steel ring dies have good corrosion resistance and wear resistance, and are suitable for producing high-quality and high-precision pellet products.

The difference between alloy steel ring dies and stainless steel ring dies is that the corrosion resistance of alloy steel ring dies is worse than that of stainless steel ring dies, the wear resistance and toughness of alloy steel ring dies are better than those of stainless steel ring dies, and the cost of alloy steel ring dies is lower than that of stainless steel ring dies.

2. Specifications and sizes of ring dies

There are countless manufacturers and models of ring die pellet machines on the market, and not all manufacturers have the same size of the same model of ring dies. Similarly, the parameter design of the ring die also varies depending on the raw materials and production environment being pressed, so it is very important to choose the appropriate specifications and sizes.

Comprehensive consideration should be given to the size, shape and output of the ring die, such as the accurate size of the ring die, die hole, appropriate compression ratio, etc. In addition, if the opening rate of the ring die is too high, it will increase the possibility of cracking. Reasonable design can improve the uniformity and quality of pellet molding.

3. Manufacturing process

The manufacturing process has an important influence on the quality and use effect of the pellet ring die. Ring die is very important from reasonable hole design, opening rate, blank forging, processing accuracy, die hole finish, suitable heat treatment process, etc., and its results affect the service life, output and product quality of ring die.

Selecting pellet mill die that has been precision machined, heat treated and surface treated can ensure that it has high precision, wear resistance and corrosion resistance.

High-precision ring die can produce better quality and more stable pellet products, and can maintain less wear during long-term production, reduce the number of ring die replacements, and reduce production costs.

4. After-sales service

Choosing a pelletizer die accessories customization manufacturer with good after-sales service can provide timely consultation and technical support to ensure the continuity and stability of the production process.

The same is a pellet machine ring die, how would you choose?

Some cheap but poor quality pellet press dies have rough processing and low service life, and also have disadvantages such as low precision, poor concentricity, and large working surface runout.

The advantage of high-quality ring die customization is that it has a long service life, is more efficient and energy-saving, produces pellets with good appearance quality, low powder content, and reduces the probability of ring die damage due to improper matching. High-quality ring die customization appears to have a higher cost-effectiveness.

Q-ico

What kind of ring die pellet machine roller is more durable?

In ring die pelletizing equipment, whether it is a flat die pellet machine or a ring die pellet machine, the die and roller are the most important working parts and vulnerable parts.

The pellet machine roller is used to extrude materials into the die and extrude them from the die hole. In order to prevent slipping and increase the grabbing force, its outer circumferential surface is processed into shapes such as tooth grooves or honeycombs.

Its performance and quality affect the output and quality of pellet processing. Since the diameter ratio of the roller to the die is about 0.4:1, the linear speeds of the two are basically equal, and the wear rate of the roller is 2.5 times higher than that of the die. It is a vulnerable part with a large consumption in the pellet processing process.

The service life of the roller is related to its manufacturing process and use environment, and maintenance cannot be ignored:

Manufacturing process

  • Roller material:
    The metal material composition and performance of the roller are prerequisites for determining its wear resistance. Commonly used high-quality roller materials are C50, 20CrMnTi, and GCr15. It is not recommended to use inferior roller materials for cheapness. The hardness and wear resistance of the ring die pellet machine roller should be guaranteed from the source.
  • Heat treatment:
    The heat treatment methods of rollers of different materials are also different. The appropriate heat treatment process can make the roller skin have a longer service life. Generally speaking, ordinary rollers HRC54-58, low hardness and poor wear resistance; RICHI roller heat treatment hardness value reaches HRC58-62, with higher strength and wear resistance.
  • Processing:
    As a measure of roller manufacturing quality, the effective width, effective thickness, and surface roughness of the material hole are closely related to the output. For example, the grinding process, the turning process is coarser than the grinding process, the inner hole is larger than the measurement result, the gap is larger, and the matching accuracy is affected.

Impact of granulation environment

  • Contains too much debris:
    The raw materials contain more impurities such as sand, stone, etc. Processing these raw materials will greatly reduce the service life of the roller.
  • Die roller gap:
    If the die roller gap is too large, the material will slip and the discharge rate will be low; if the gap is too small, the mechanical wear will be large, affecting the life of the whole machine.

    The gap is generally 0.1-0.3mm, which can be increased to 0.5mm when pressing grass powder. The control of the gap is also related to the circular runout of the inner diameter and end face of the die roller to the installation positioning reference surface.

Generally, there is a certain limit to the adjustment of the eccentricity of the roller. When it is worn to a certain extent and the eccentricity cannot be adjusted to the required gap, a new roller should be replaced. If the new roller is installed and still cannot be adjusted to the required gap, in order to ensure the quality of the pellets, a pair of rollers with a slightly larger outer diameter can be customized for continued use.

RICHI reminds everyone that roller maintenance is the key to extending the service life of the die. During installation, check whether the bearings, roller retaining rings, and retaining covers in the roller are installed in place, check whether the oil injection holes of the roller eccentric shaft are blocked, check the roller for abnormal wear regularly, and lubricate the roller.

Q-ico

How to calculate the ton consumption cost of the pellet machine ring die?

The ring die pellet machine is a key equipment in the pellet production process, and the ring die is one of its key components.

The pellet machines with different ring die specifications have different productivity and quality of pellets, while the feed wood pellet machines with the same ring die specifications have different quality and production efficiency of pellets made from different raw materials.

The die loss cost of pellet machine accounts for more than 25%-30% of the maintenance cost of the entire production workshop.

Under the condition of the same production efficiency and production power consumption, it is meaningful to compare the total output of pellets produced by ring die, or the ring die cost per ton loss.

The following is a research on the ton consumption of a pellet machine ring die of a certain customer. The equipment is a certain 420 model. The ring dies produced by two die manufacturers are all made of stainless steel, with the same aperture and compression ratio. The same formula raw materials are produced in the same period of time.

Ring dies produced by different die manufacturers, low-priced products do not necessarily have low production costs; ring dies with high ton loss do not necessarily have high production costs.

Selecting high-quality ring dies requires material selection, design, and manufacturing processes. In addition, low-priced ring dies may use products with low material standards, relatively simple production processes, and low opening rates.

In actual pelletizing production, some friends choose cheap ring dies when purchasing. Such products may eventually have a relatively short service life of the ring dies, low production efficiency, and high power consumption.

As a result, the price is reduced, but the amount of ring dies used is increased, and the production efficiency is reduced, and the comprehensive production cost is increased. This situation is very common.

Q-ico

What kind of pellet machine ring die is more durable?

Ring die is an important part of ring die pellet machine, and it is also a consumable part of pellet production. Every replacement and maintenance requires a lot of manpower and time costs, which greatly increases the production cost.

In order to achieve high output and low loss and extend its service life, RICHI believes that the following reasons are analyzed:

  • Material: The material quality of the ring die is the key factor affecting its life. High-quality alloy steel and stainless steel are mostly used. The factors affecting its service life are mainly the wear resistance, corrosion resistance and fracture resistance of the ring die.
  • Wear resistance. Most ring dies fail due to inner surface wear and die hole wear during repeated use. The wear resistance of the ring die material is a key factor directly affecting the life of the ring die. It is closely related to the metallographic structure, surface hardness and chemical composition of the material. To improve the wear resistance of the ring die, it is necessary to select the appropriate ring die material and heat treatment method.
  • Corrosion resistance. Some raw material formulas contain chemical components. Under high temperature and high pressure, the chemical components react chemically to release acidic substances, causing pitting of the pressure roller and corrosion of the ring die.
  • Fracture resistance. During the pelletizing process, the pellet machine die is subjected to great pressure, which may cause instantaneous fracture of the ring die, or may cause damage accumulation due to the increase in the use time of the ring die, and eventually cause fatigue damage to the ring die.

The selection of pellet mill ring die materials, heat treatment of materials, and the size and distribution of die holes are all key factors that determine the fracture resistance of the ring die. Increasing the hardness of the ring die can improve wear resistance, but this will reduce its fracture resistance.

Materials with strong corrosion resistance have low fracture resistance and low wear resistance. Therefore, the material of the ring die should be selected by comprehensively considering its usage.

  1. Working environment
    During the working process, the ring die pellet machine needs to withstand complex environments such as high temperature, high pressure, and high speed. If the ring die is in a high temperature, high pressure, and high speed environment for a long time during use, it is easy to cause the ring die to deform or crack due to heat, thereby affecting its service life.

    After the pellet machine stops working, if the next production time is long, the raw materials left in the hole need to be removed in time. For raw materials that need to be adjusted in size, they should be treated with impurities and adjusted to a stable and uniform size to avoid internal damage caused by the raw materials.
  2. Manual operation
    Improper use of pellet machine ring die is also one of the reasons why the ring die is not durable. Common improper use includes: failure to fully check or adjust the equipment before starting, excessive load on the pellet machine, etc. Specific raw materials and raw material moisture are matched with specific ring die compression ratios.

    The gap between the roller and the ring die has a great impact on the efficiency of the pellet machine and the service life of the equipment. The gap should be maintained between 0.1mm-0.3mm. Reduce the time of cavity running without material and running short of material.
Q-ico

Which one is better for the hardness of the ring die roller?

The choice of roller material also has an important impact on the service life of the ring die pellet machine. When it is working, the linear speed of the die and roller is basically the same, but the diameter of the roller is small, so the wear rate of the roller is greater than that of the ring die.

In order to replace the die and roller at the same time as much as possible, the hardness of the roller should be 5-6HRC higher than that of the ring die, so in practical applications, rollers made of high carbon alloy steel are generally selected.

Due to the irregular wear of the ring die, when the new roller is used with the old ring die, the service life of the roller is shorter and difficult to repair.

To achieve the goal of matching new dies with new rollers and old dies with old rollers, the surface shapes of the ring die and the pressure roller are close to the shape-matching state, and the local gaps between the ring die and the pressure roller are roughly the same. This can make the stress and discharge of the entire ring die very uniform, and improve production efficiency.

Q-ico

What are the common die holes of pellet machine ring die? Which hole type is suitable for your ring die?

The ring die pellet machine is one of the main machines for making pellet feed. The ring die is a multi-porous and uniformly distributed die. The raw materials are forced to pass through the die holes of the ring die under the extrusion of the ring die and the pressure roller.

High-quality pellet machine ring dies are mostly based on two aspects: one is the material selection of the ring die itself and the corresponding heat treatment technology, and the other is the die hole processing of the ring die.

Today we will talk about the common die hole types of ring die. Common die hole shapes include straight holes, stepped holes (release stepped holes, compression stepped holes), inner tapered holes and outer tapered holes.

  • Straight holes have moderate performance, are easy to manufacture, and are widely used;
  • Stepped holes reduce the length of the die hole, shorten the material extrusion time, and are widely used;
  • Inner conical holes have high extrusion density, high hardness, and low pulverization rate;
  • Outer conical holes are conducive to the passage of particles, with low extrusion density and low hardness.
  • The aperture of the release hole is larger than the diameter of the die hole, and no friction is generated when the material passes through the pressure relief hole.

Taking the processing of feed pellets as an example, straight holes and stepped holes are suitable for pressing compound feed; external tapered holes are suitable for processing high-fiber materials such as defatted bran; internal tapered holes are suitable for pressing larger pasture pellet feed.

In addition, the size and structural shape of the feed hole of the die hole have a great influence on the ring die. The feed hole is also called the guide hole or the guide cone hole. The shapes of cone holes and straight holes are more commonly used, which is conducive to the material entering the die hole and reducing the resistance to the hole.

The difference in cone angle and feed cavity length will also affect the service life and particle forming of the ring die. The diameter should be larger than the aperture. The ratio of the feed port area to the cross-sectional area of the die hole is the compression rate.

The compression ratio and compression rate are easy to confuse. The compression rate of small die holes can be smaller, and the compression rate of large die holes can be larger. During the use of the ring die, the guide hole wears the fastest, and the guide hole must be repaired during use.

Q-ico

How to read the specifications and models of pellet machine ring die?

How to read the specifications and models of pellet machine ring die? What data are used to name it?

Ring die specifications and models In fact, the specifications and models of ring die pellet machines are similar.

Some newly established small manufacturers will modify the basic data of pellet machines of some large manufacturers, or upgrade their original pellet machines, so the size of the pellet machine ring die is different. The specifications and models of pellet machine ring dies are generally named according to the inner diameter value of the ring die.

For example, the outer diameter/inner diameter*height of the 350 ring die is 465/350*155, and 350 represents the inner diameter of the ring die of 350 mm.

However, some manufacturers are inconsistent, such as the 560 ring die, the outer diameter/inner diameter*height is 690/548*195, and 548 represents the inner diameter of the ring die of 548 mm, so the specific details should be based on the drawings or actual measurements.

When you are considering ring die customization, if you are not sure about its model size, aperture and compression ratio, you can send samples, and RICHI will provide free measurement services for everyone.

Q-ico

There are so many types of pellet machine roller tooth types, which one is the best?

The roller is an important part of the ring die pellet machine, and its main functions include cutting, kneading, inlaying, and extrusion. Its outer circumferential surface is processed into tooth grooves or honeycomb shapes to increase contact with the object, increase the friction between the material and the roller when the die moves, and drive the rotation.

When the diameter of the roller teeth is worn to the limit, only the roller needs to be replaced, and the ring die and roller can work normally again.

Types of pellet machine roller teeth

The tooth surface form of the pellet machine roller shell has a certain influence on the pelletizing performance. There are three most commonly used tooth types, namely, through groove type, closed groove type, honeycomb type, and some other tooth types, such as human tooth type, through groove step tooth type, helical tooth type, etc.

  1. Through groove type:
    The straight groove of the through groove roller is located in the middle of the axial direction of the outer surface of the roller shell, and the length is equal to the width of the roller shell.

    It can play the role of slot-to-smooth material, and can partially release pressure when the pressure is too high, reducing the wear of the roller ring die. The coiling performance is good and the operation is relatively stable. It is just that the two ends are prone to leakage, causing losses; the wear on the ring die will be uneven.
  2. Closed groove type:
    Closed groove type roller is also called closed groove type. The straight groove is located in the middle of the axial direction of the outer cylindrical surface of the roller shell, and the length is less than the width of the roller shell.

    During its operation, the material is not easy to slide to both sides, it is difficult to leak, and the coiling performance is good. But the material leveling effect is relatively stiff.
  3. Honeycomb type:
    Honeycomb type roller is also a perforated type. There are several rows of small holes evenly distributed in the circumferential direction of the outer cylindrical surface of the shell. The small holes are arranged in the middle of the axial direction of the outer cylindrical surface of the roller shell.

    The length of each row of small holes is less than the width of the roller shell. It wears the ring die evenly and can effectively extend the service life of the ring die. But the coiling performance is relatively poor.

How to choose the roller tooth type?

We have summarized some experience and analyzed it from the following aspects, hoping to help you:

  1. The tooth groove type roller includes through grooves and closed grooves, with good coiling performance, and is widely used in animal feed mills and biomass pellet plants. Toothed rollers can be divided into coarse teeth and fine teeth: for small-hole ring dies, fine-toothed rollers are often selected to match them, while coarse-toothed rollers are mainly used for large-diameter ring dies.
  2. Honeycomb and through-groove rollers are mostly used for pelleting livestock and poultry feeds.
  3. Closed-groove rollers are mostly used for pelleting of aquatic feeds and raw materials with fine particle sizes. The raw materials are not easy to slide to both sides during extrusion. In pellet production, users will choose a more suitable roller tooth type according to the raw materials they press.

RICHI reminds everyone that due to the working principle and harsh working conditions of the ring die pellet machine, even if the roller quality is good, it needs to be replaced regularly after being worn. Its life is shorter than that of the ring die and the consumption is large.

Q-ico

What is the die hole structure of the pellet machine ring die?

The structural characteristic parameters of the pellet machine ring die are usually expressed by the die hole diameter, ring die thickness, effective working length, pressure relief hole depth, feed orifice diameter, feed orifice angle, ring die opening rate and aspect ratio. Its parameters have a certain influence on the quality of pellet molding.

There are multiple rows of forming through holes spaced apart from each other on the ring die. The through holes are mainly composed of three parts: feed hole (material guide hole), forming straight hole and discharge hole. The form of die hole is designed and selected according to the characteristics of different raw materials.

1. Feed hole

The diameter of the feed hole should be larger than the diameter of the die hole, so as to reduce the resistance of the material to the hole and facilitate their entry into the die hole. There are three basic forms of feed holes, namely straight hole, conical hole and curved hole.

At present, the most common feed hole is the conical hole form, which is a funnel-shaped structure, also called a bell mouth, which makes it easier for the material to enter the forming straight hole and prevents the material from accumulating on the inner wall of the ring die to cause a stuffy car.

2. Forming straight hole

The ratio of the effective length of the forming straight hole to its aperture is called the aspect ratio (compression ratio). This compression ratio is a parameter closely related to the density and strength of the pressed pellets, and is an indicator of the extrusion strength of the particles. The larger the compression ratio, the stronger the extruded pellets.

For the compression ratio of the straight hole ring die, the effective length of the ring die hole is the total thickness of the ring die, and the minimum diameter is the diameter of the die hole itself.

3. Discharge hole

The discharge hole can be designed as a pressure relief hole (release hole), an outer conical hole or an inner conical hole. The pressure relief hole is trumpet-shaped outward, and the purpose is to make it easier for the extruded pellets to be demolded and discharged. The molded straight hole is an important structure for granulation.

When the diameter of the straight hole remains unchanged and its length is extended, the compression ratio becomes larger, and the holding time of the raw material after being squeezed into the straight hole will also become longer.

The pressed pellets have a large density, a smooth appearance and are not easy to break and deform. However, due to the long holding time of the particles, the production efficiency of the pellet machine will decrease and the production cost will increase.

Therefore, the diameter and length of the molded through hole should be determined according to the material conditions and the requirements of the size of the molded pellets.

In addition, the roughness of the ring die hole is also an important indicator for measuring the quality of the ring die. Under the same compression ratio, the larger the roughness value, the greater the particle extrusion resistance and the more difficult the discharge.

Excessive roughness also affects the quality of the particle surface. Generally, the appropriate roughness value should be between 0.8-1.6.

Q-ico

How to design the ring die of animal cattle sheep feed pellet machine?

In the production of ring die pellet machine, the production of feed is an important link. Ring die design is one of the key links in the production of cattle and sheep feed.

Reasonable ring die design can improve the production efficiency and quality of ring die pellet machine. Below RICHI will introduce some key points of ring die design required for animal cattle sheep feed production.

  1. Ring die aperture size:
    The size of the ring die aperture directly affects the size of the pellets. For cattle and sheep feed, the pellet size is generally required to be between 4-10mm. Therefore, when designing the ring die, it is necessary to determine the appropriate aperture size according to the feeding needs of cattle and sheep.
  2. Hole area distribution uniformity:
    The uniformity of the distribution of the ring die hole area is also an important design consideration. In the production of cattle and sheep feed, to ensure the uniform size of the particles, it is necessary to design a ring die with a uniform hole area distribution. Through a reasonable hole area distribution design, the situation of particles being too large or too small can be avoided.
  3. The shape of the ring die hole:
    The shape of the ring die hole will also affect the shape of the pellets. For cattle and sheep feed production, circular holes or circular holes with tapers are generally used. Circular holes can produce more regular pellet shapes, while taper holes can help reduce hole blockage.
  4. Ring die hole density:
    The density of the ring die hole also needs to be considered. On the one hand, too low hole density will lead to a decrease in output, and on the other hand, too high hole density will increase power consumption and ring die wear. Therefore, when designing the ring die, it is necessary to comprehensively consider the balance between output and energy consumption.
  5. Ring die material selection:
    The material selection of the ring die is also very important. In general, materials with high hardness and high wear resistance are more suitable for use in cattle and sheep feed production. Common ring die materials include alloy steel and stainless steel, etc., and suitable materials can be selected according to production needs.

In short, the design of ring die in cattle and sheep feed production is a process that comprehensively considers multiple factors, and it is necessary to determine reasonable ring die parameters according to the characteristics of the feed and production requirements.

Through reasonable ring die design, the production efficiency and product quality of the ring die pellet machine can be improved to meet the feeding needs of cattle and sheep.

Q-ico

How to design cutter of ring die pellet mill?

The cutter of the ring die pellet machine is mainly used to cut the formed pellets. The design of the cutter has a great influence on the size and shape of the pellets. At present, most of the cutters of the ring die pellet mills on the market use rotary cutters.

The working principle of the rotary cutter is to use a high-speed rotating disc to cut the pellets into the required size. The disc is equipped with a blade, and the pellets fall from the top into the gap between the disc and the blade, and after being cut by the blade, they fall into the collector below.

This cutter design can effectively ensure the uniform shape and size of the pellets, making the pellets more competitive in the market.

In addition, in order to ensure that the cutter of the ring die pellet machine can work normally and improve its wear resistance and life, the cutter material is also very important. The commonly used cutter materials on the market are high chromium alloy, high-speed steel, cemented carbide, etc.

Among them, cemented carbide is a material with excellent wear resistance and hardness, which is widely used in the production of blades for ring die pellet machines. (Find RICHI on youtube)

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