Horizontal Ring Die Wood Pellet Mill

Horizontal Ring Die Pellet Mill is also named pellet machine, pellet maker, pellet press, pelletizer, pellet making machine, and pellet mill. Which is the main machine in the wood pellet line. it is retrofit over products according to the characteristics of biomass fuel particles based on our feed pellet machine, it mainly used for pressing flammable biomass materials such as sawdust from softwood and hardwood, wood chips, wood shavings, straw, stalk, grass, rice husk, bagasse, peanut shell, sunflower husk, coconut shell, EFB, and any other biomass material to pellets, so it is the most popular and most utility pellet mill among the three kind pellet machines.

Mature technology, stable working status, high efficiency for both soft and hard raw material. Ring die with special compression ratio according to different kind raw material. Horizontal structure, easy to change ring die and rollers. Best pellet mill to make EN and DIN A+ standard pellets.

Variable frequency feeding motor work together with forcing feeding device to ensure uniformly feeding without blockage. Overload protection device and iron removing device are installed to ensure safety production. Automatic lubrication system for bearings，saves both time and labor，more safety and reliably. Alloy steel ring die is made by international advanced German gun drill and American vacuum furnace, has long service life and ensure smoothly pelletizing and high quality. The international advanced compensation type flexible coupling is of novel and compact structure, safety, low noise and less trouble.

Horizontal Ring Die Wood Pellet Mill Structure

Ring die wood pellet mill is made up of a base frame, motor, coupling, gearbox, main shaft, hollow shaft, rollers, ring die, force-feeding system, feeding system, and control system.

1. The feeding system is the feeder auger on top of the pellet mill, it adopts frequency control to change the feeding speed by VFD, thus avoiding material block in the pellet mill and overload, from the feeder auger, raw material go to force feeder by gravity.

2. The force feeder pushes the raw material go to the pelletizing room, force feeder is an important part of the horizontal ring die pellet mill even it is a small part because the bulk density of biomass material is low, the mobility is not good, so the force feeder can help to push the material into pelletizing chamber.

3. In a pelletizing room of the horizontal ring die pellet mill, there is a feeder scraper, rollers, ring die, main shaft, and hollow shaft, the rollers are fixed on the main shaft which is stable during machine working, but the roller shell is running, the ring die is fixed on the hollow shaft by a hoop, the ring die is running during machine working. After the material goes to the pelletizing room, the rollers and scraper will press the material into holes on the ring die, the material will press out from the holes to get pellets. The diameter and effective extrusion length of the holes decide the size of final pellets, the ratio between effective extrusion length of the hole on the ring die and diameter of the hole is called compression ratio, which is an important data of the ring die, it decides the quality of final pellets. According to the character of different raw materials, we can make a special compression ratio ring die for one kind of raw material, so just change the ring die can make the pellet mill suitable for different raw materials.

Horizontal Ring Die Wood Pellet Mill Technical Parameters

Item	SZLH250	SZLH320	SZLH350	SZLH420	SZLH508	SZLH558	SZLH678	SZLH768
capacity	0.1-0.2T/H	0.3-0.5T/H	0.6T/H	1T/H	1.5T/H	1.8-2T/H	3T/H	4T/H
Main Power	22KW	37/45KW	55KW	90KW	110KW	132KW	220KW	315KW
Power of Feeding Auger	0.75KW	1.1KW	1.5KW	2.2KW	2.2KW	2.2KW	3KW	4KW
Power of Conditioner	0.75KW	0.75KW	0.75KW	1.1KW	1.1KW	1.1KW	1.5KW	2.2KW
Inner Diameter of Die	250mm	320mm	350mm	420mm	508mm	558mm	678mm	768mm
Die Speed	150RPM	150RPM	150RPM	150RPM	150RPM	150RPM	150RPM	150RPM
Feeder Auger Speed	12-120RPM
Pellet Size	6, 8, 10, 12mm. etc.
Roller Number	2
Noise	≤86dB(A)				≤90dB(A)
Die Working Temperature	≤85℃

Ring Die Pellet Mill

In complete pellet production line, ring die pellet mill is the key equipment to process raw materials like wood chips, tree braches, sawdust, logs, crop straw, etc. into pellets. The capacity of single ring die biomass pellet machine ranges from 500kg/h to 3 tons/h, which allows both small scale and large scale pellet production.

The origin of the name of ring die pellet machine is derived from its structure with the die shaped of “circle ring”. In the ring, there are 2 or 3 rollers inside to rotate and extrude the material in the middle, thus the material go through the die holes to be cylindrical pellets.

Types of Ring Die Pellet Mill Machine – Vertical & Horizontal

Ring die pellet mill machine is divided into two types: Vertical Ring Die Pellet Mill & Horizontal Ring Die Pellet Mill. Each type has its own unique features.

Vertical Ring Die Pellet Mill Working Principle

The vertical ring die pellet mill is specially designed to press the material which is hard to be bonded and shaped. The material can be loaded into the pelleting chamber in its own weight. Then, under the strong pressure between the rotating roller and the ring die, the material enters into the die holes to be formed into pellets. The vertical ring die pellet mill is called light-weight material pellet mill as well. Because vertical pellet mill is more suitable for managing the materials with light weight, such as, rice hull, grass with light weight, straw, melon and fruit hull and the material which is not easy to form.

Vertical pellet mill the ring die is fixed, and the roller rotate in high speed. The shaped pellets will pushed out directly from the holes, so there is no second hit between pellets, the pellets length are more uniform and less sawdust. Higher successful rate for pellet making.

Horizontal Ring Die Pellet Mill Working Principle

Differ from the vertical ring die pellet mill, the horizontal ring die pellet mill adopts the feeding auger to feed the material into the pelleting chamber through the stock bin. The material begin to be soft in the sealed pelleting chamber, and under the great extrusion between rotating ring die in a high speed and the roller, the soft material is pressed into the holes uniformly distributed on the die. After that, the formed cylindrical solid body out of the holes will be cut by the knife, thus discharged through the export hole.

Features between Vertical VS Horizontal Ring Die Pellet Mill

As the different types of ring die pelleting mill, the two type of ring die pellet machine have their own unique advantages.

Vertical Ring Die Pellet Mill

Vertical ring die pellet mill is applicable for difficult molding materials with low adhesion rate, for example peanut shell, rice husk, fruit shell and sunflower husk; branches, bark, stem and other wood residues, various of crop stalks etc.

The new generation gearbox adopts high-precision gears, automatic lubricant pump system, keeping the gearbox working stability and warranty period.

In this vertical ring die pellet mill, the die holes with equidistant distribution are centered by the output shaft, making more powerful and stability of machine working.

Automatic lubrication system. The gear box is configured with circulation pump lubricating system controlled by the pinch roller to inject oil in timing. The oil pump motor can lubricate with automation and circulation making sure the shaft can be fully lubricated thus making the pellet machine running safely.

The blower system is equipped in side of the working bin, controlling the working time freely.

Feeding vertically with frequency conversion makes the feedstock uniform with no arch camber and easy heat dissipation.

Horizontal Ring Die Pellet Mill

The all-stainless steel feeder, configured with original imported frequency converter to control feeding uniformly and accurately.

Monitoring system is equipped, solving the problem of high temperature hazard in the pelleting chamber caused by the improper operation thus efficiently avoiding the danger of bursting and fire.

The components is made by international advanced manufacturing craft and designed according to the characteristics of the material from the customers, prolonging the service time of the equipment.

The ring die of feed machine with quick-release coupling reduces the time of replacing the ring die and improves the production efficiency.

Double-motor drive. The high strength SPB narrow V-belt drive transmit with stability and reliability but with low noise.

The horizontal ring die pelleting mill is configured with many kinds of ring dies with different aperture diameters and compression ratio, the customers can choose according to their needs.

Flat Die VS Ring Die Pellet Mill

According to the production capacity, pellet mills also can be divided into flat die pellet mill and ring die pellet mill.Flat die pellet mill use flat dies with many holes. When the material is introduced into the top of the die, the drum or die can start to rotateand the material will be squeezed through the holes in the die. A cutter on the other side of the mold will cut the exposed particles out of the mold. Ring die pellet mill use ring dies with radial grooves. The material is first fed into the inside of the mold and distributed evenly by the spreader. Then they will be compressed by two rollers through the die hole, and the particles coming out of the die will be cut out by two cutters.

Feeding Method: The ring die granulator adopts mechanical feeding method. The raw material enters the granulation chamber at high speed by means of rotary centrifugation. The feed is distributed by the oil cloth machine to achieve uniform feeding; the flat die granulator falls into the granulation chamber by its own weight to achieve uniform feeding.

Pellet Formation: Flat die types have a circular perforated disk on which two or more rollers rotate and force the material through the holes to form pellets. Ring die presses have a rotating perforated ring on which rollers (usually two or three) press the material to the inner circumference to form pellets.

Adjustment of the rollers: The ring die pellet granulator machine utilizes two screws on the eccentric gear located in the center of the rolls to adjust the pressure. The flat die granulator adopts the way of center adjusting screw. It has the characteristics of bearing hundreds of tons of top pressure, falling smoothly, hitting softly, and being evenly pressed.

Different Pressure: At the same die diameter, the rollers of the ring die feed granulator machine are limited by the die diameter and therefore the pressure. The pressure of the flat die feed granulator machine is adjustable. The flat die diameter is not limited by the die diameter, which can expand the inner bearing space. The use of large bearings not only enhances the bearing capacity of the rollers, but also prolongs the service life.

Production Capacity: The maximum output of the flat die granulator is about 80-1000 kg/hour, while the maximum output of the ring die granulator is about 500-4000kg per hour.

Purchasing Price: flat die pellet mill has small size and light weight, also low production capacity, surely the buying flat die pellet mill price for sale is low cost and it is very low and is affordable for everyone. so it is popular for home use, or small farmers. ring die pellet mill has large size, heavy weight, and high production capacity, the ring die pellet mill price for sale is higher cost,and it is very higher, and not everyone can afford it, usually it is used for commercial use.

Power Source:flat die pellet machine can be powered by electric motor or diesel engine motor, but ring die pellet machine can only be powered by electric motor, because the different transportation structure, the motor is connected directly with the shaft. it can not be connected with diesel engine.

Flat die vs ring die pellet mill which one is better?

The flat die wood pellet granulator machine has low energy consumption and high fluidity, and is suitable for small family workshops

Ring die wood pellet mill generate less wear and tear when pelletizing. Ring die pellet mills being adopted in most large scale pellet production lines. The ring die granulator also has the characteristics of good granulation shape and high density (1-1.3%). The ring die pellet mill will be much easier to produce high quality pellets and high efficiency output.

Definitly no choice is the best, they have different advantages and disadvantages,and for different usage. you should choose flat die pellet mill or ring die pellet mill according to your use.

Notes on Biomass Pellet Raw Materials

Raw material types and features can exert great influence on biomass pellet production. For example:

–Biomass pellet made from hard wood has smaller productivity than that made from soft wood as hard wood like birch, elm are drier and denser than soft wood like pine, spruce and firs, thus wood pellet capacity is elastic.

–Raw material should not be completely fine powder, although the fiber material in powder is in favor of wood pellet forming, the powder should be 3-5mm,neither too small nor too big.

So for super quality wood pellets production, choosing the proper material type is significant.

Ring Die Pellet Machine Production Line

Crushing process—–crusher/hammer mill

If the raw material is big logs with diameter less 300mm or big timber cutter, our BX-Series Chipping and Crushing Machine is your best choices; while tear-circle crusher/Hammer Mill is widely used to crush each kind of straw, wood chip, tree branch, bark and leftover bits from agricultural wastes. The best moisture content in the Crushing Process is less 18%, and the thickness of the wood chip is less 5mm. The moving full-wide operation door facilitates maintenance and replacement. It is widely used in various feed mills, oil plants, alcohol plants, citric acid plants, etc.

Drying priocess—–Rotary Dryers

The best moisture content to pelletizing is about 14-16%. Our new Air-Current Rotary Dryer is made up of Burning Stove and Main Rotary Dryer, which can realize to reduce the moisture from 50% to 10%, and save about 30% energy consumption comparing the old Rotary Dryer. Our burning stove is fueled by coal and wood material, which can save electricity consumption largely. If the users want to use the other fuel such as gas and electricity, one Burner is necessary, but the extra cost will be charged.

Pelletizing Process—–Ring die pellet mill

(1). The lubrication system for wood pellet mill adopts the tracing and inspecting system controlled by the microcomputer. When the temperature of the bearing is over the normal temperature, the microcomputer will start the round closed Auto-Lubrication System to lubricate the bearings, which complete solved the trouble of lubricating roller depending on the operation experience. (2). Driving Gear adopts the high precision gear transmission structure. The wear bearing is made from China Biggest Bearing Manufacturer according to our special requests. The ring die adopts the hoop fastening method, which increased the speed of discharge (3). As to the ring die and roller of the pellet mill, we have the fine machining with the alloy steel, such as 40Cr and stainless steel, such as 4 Cr13 . And our heating treatment is also different from the other domestic manufacturer, our lithium grease treatment improves the anti-abrasion of the ring die and roller more than 10 times, it can save the production cost greatly.

Cooling and screening process—–Pellet coolers

The temperature of the pellet is about 70 degree, and the moisture content of the wood pellet is about 15%, so we need use Cooler to reduce about 3-4% moisture, in this way, the pellet is easy to store and transport.

Packing and storing and storing process—–Pellet Packing Machines

Ring Die Wood Pellet Machine Manufacturer

We are now one of largest wood pellet mill manufacturers in China, providing factory price flat die pellet mill, vertical ring die pellet machine and horizontal ring die pellet mill. We offer turnkey solutions to build biomass pellet plant projects, including equipment selection, equipment manufacturing, onsite installation and commissioning. We have built complete wood pellet production plant in many countries like Indonesia, Canada, Italy, United States, Russia, Morocco, Peru, Romania, etc.. Besides,the factory price of our machine is reasonable,the quality is guaranteed,and the service is superior.

If you are also interested in setting up biomass pellet production line, here, we have complete project report that are valuable for project cost estimation. Any questions about our ring die pellet mill machine, please contact us, we are here for your needs!