Feed twin-screw granulator

Abstract

The utility model discloses a feed twin-screw granulator which comprises a twin-screw granulator main body and a hopper, the feed end of the twin-screw granulator main body is communicated and connected with the hopper, and a material plate is fixedly arranged in the hopper. The double-screw granulator disclosed by the utility model has the beneficial effects that the double-screw granulator is provided with the feeding groove and the vibration motor, when feed granulation is carried out, feed raw materials are contained in the hopper above the material plate, the stepping motor drives the rotating shaft to rotate and drives the turning plates to rotate, and the feed raw materials falling between the turning plates are uniformly added into the double-screw granulator main body along with the rotation of the turning plates; the problem that the double-screw granulator is blocked due to accumulation of feed raw materials is avoided, the granulation stability is improved, meanwhile, the vibration motor is started in the feed raw material discharging process, generated vibration facilitates sliding of the feed raw materials to the position between the turning plates, the position between the turning plates can be filled with the feed raw materials conveniently, the feeding stability during turning of the turning plates is guaranteed, and the production efficiency is improved. And the feeding uniformity and the working efficiency are improved.

Description

Technical Field

[0001] This utility model relates to the field of feed production technology, specifically to a twin-screw pellet mill for feed. Background Technology

[0002] Feed is a general term for the food of animals raised by all people. In a narrower sense, feed mainly refers to the food of animals raised in agriculture or animal husbandry. Feed includes more than ten kinds of feed ingredients such as soybeans, soybean meal, corn, fish meal, amino acids, miscellaneous meals, whey powder, oils, meat and bone meal, grains, and feed additives.

[0003] To facilitate feed use and transportation, traditional feed processing typically requires pelleting. Twin-screw pellet mills are widely used in feed pelleting due to their simple structure and high efficiency. However, during pelleting, manual feeding is required, which cannot guarantee uniformity and easily leads to overfeeding or underfeeding. Overfeeding can cause blockages, while underfeeding affects efficiency and causes inconvenience. Furthermore, to ensure better pellet formation, water needs to be added to the dry feed ingredients as a binder. Adding water directly to the ingredients not only causes them to stick to the inner wall of the twin-screw pellet mill's feed hopper, resulting in poor feeding, but also requires the water-added feed to be used immediately without recycling for secondary storage, further impacting usability. Further improvements are needed. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a twin-screw feed pellet mill, which has the advantages of uniform and stable feeding and improved pelleting stability, thereby solving the problems mentioned in the background technology.

[0006] (II) Technical Solution

[0007] To achieve the advantages of uniform and stable feeding and improved pelleting stability, the specific technical solution adopted by this utility model is as follows: A twin-screw pellet mill for feed includes a twin-screw pellet mill body and a hopper. The feeding end of the twin-screw pellet mill body is connected to the hopper, and a material plate is fixedly installed inside the hopper. A feeding trough is fixedly connected to the bottom surface of the material plate. A stepper motor is fixedly installed on the front surface of the hopper, and a rotating shaft is installed at the output end of the stepper motor. A flap is fixedly installed on the surface of the rotating shaft. A water tank is installed on one side of the twin-screw pellet mill body, and a water pump is connected to the bottom surface of the water tank. The output end of the water pump is connected to a diversion pipe through a water supply pipe. A nozzle is connected to the surface of the diversion pipe through a spray pipe.

[0008] Furthermore, the nozzle extends through into the hopper, and the nozzles are located on both sides below the feeding trough.

[0009] Furthermore, the material plate is arranged at an angle, and a vibration motor is fixedly installed on the bottom surface of the material plate.

[0010] Furthermore, the rotating shaft is coaxially arranged with the feeding trough, and the rotating shaft is rotatably connected to the side wall of the hopper through a sealed bearing.

[0011] Furthermore, the flaps are distributed in multiple sets at equal angles along the central axis of the rotation shaft, and the edges of the flaps slide against the inner wall of the feeding trough.

[0012] Furthermore, the bottom surface of the feeding trough is provided with a discharge port, which is located above the nozzle.

[0013] Furthermore, a water inlet is provided on the top surface of the water tank.

[0014] (III) Beneficial Effects

[0015] Compared with the prior art, this utility model provides a twin-screw pellet mill for feed, which has the following beneficial effects:

[0016] (1) This utility model is equipped with a feeding trough and a vibration motor. When the feed is pelleted, the feed raw materials are placed in the hopper above the feed plate. The stepper motor drives the rotating shaft to rotate, which in turn drives the flip plate to rotate. The feed raw materials falling between the flip plates are evenly added to the main body of the twin screw pellet mill as the flip plates rotate, which avoids the problem of feed raw materials accumulating and causing blockage of the twin screw pellet mill, and improves the stability of pelleting. At the same time, the vibration motor starts during the feeding process of the feed raw materials. The vibration generated is conducive to the feed raw materials sliding between the flip plates, making it easier for the feed raw materials to fill the space between the flip plates, ensuring the stability of feeding when the flip plates are turned, and improving the uniformity of feeding and working efficiency.

[0017] (2) This utility model is equipped with a nozzle and a spray pipe for water replenishment. When the feed raw material slides out of the discharge port, the water pump starts and draws water from the water tank. The water enters the spray pipe through the water supply pipe and the diversion pipe and sprays it on the surface of the feed raw material along the nozzle to humidify the feed raw material and increase the moisture content. This avoids the problem of poor pelleting stability caused by the feed raw material being too dry. At the same time, by adding water later, the feed raw material located above the feed plate is kept in a dry state, which is convenient for recycling and storage. In addition, the dry feed raw material falls more stably, reduces the phenomenon of adhesion to the inner wall, and improves the stability of feeding. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the internal structure of a twin-screw pellet mill for feed according to an embodiment of the present utility model;

[0020] Figure 2 This is a front view of a twin-screw pellet mill for feed according to an embodiment of the present utility model;

[0021] Figure 3 This is an enlarged view of node A of a twin-screw pellet mill for feed according to an embodiment of the present utility model;

[0022] Figure 4 This is a schematic diagram of the external structure of a twin-screw pellet mill for feed according to an embodiment of the present utility model.

[0023] In the picture:

[0024] 1. Twin-screw granulator body; 2. Hopper; 3. Material plate; 4. Vibrating motor; 5. Feeding trough; 6. Water tank; 7. Water pump; 8. Water delivery pipe; 9. Diverter pipe; 10. Spray pipe; 11. Stepper motor; 12. Rotating shaft; 13. Flip plate; 14. Discharge port; 15. Nozzle. Detailed Implementation

[0025] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0026] According to an embodiment of the present invention, a twin-screw pellet mill for feed is provided.

[0027] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. Please refer to them. Figure 1 and Figure 3According to an embodiment of this utility model, a twin-screw pellet mill for feed includes a twin-screw pellet mill body 1 and a hopper 2. The twin-screw pellet mill body 1, as the core component, features a twin-screw extruder with a parallel, co-rotating structure. The screw diameter is 80mm, and the length-to-diameter ratio reaches 42:1. A variable frequency speed control system allows for speed adjustment from 30-300rpm. Combined with a modularly designed pelleting head, it can adapt to the production needs of feed pellets of different sizes and shapes. These are all mature equipment configurations widely recognized in the industry, and therefore will not be elaborated upon further. The feed end of the twin-screw pellet mill body 1 is connected to the hopper 2 via a flange. The inner wall of the hopper 2 is treated with a mirror polishing process, with a roughness Ra value controlled below 0.8μm, effectively reducing the adhesion residue of powdery raw materials such as corn flour and soybean meal. Actual testing shows that compared to a conventionally treated inner wall, the raw material falling speed is increased by 30%, greatly improving the smoothness of the raw material falling.

[0028] Inside the hopper 2, a material plate 3 is fixedly installed. The material plate 3 is distributed in a 120° trumpet shape, and its top surface is also mirror-polished, forming a smooth curved surface that connects with the inner wall of the hopper 2, further optimizing the material's downward path. Furthermore, a feeding trough 5 is welded to the bottom surface of the material plate 3. The feeding trough 5 is a cylindrical trough with an inner diameter of 150mm, and its length is customized to 300mm according to the size of the twin-screw feed inlet. A stepper motor 11, model 42BYGH40-1704A, with a step angle of 1.8°, is fixedly installed on the front of the hopper 2 via a shock-absorbing base. Precise rotation control is achieved through a closed-loop control system. The stepper motor 11, the rotating shaft 12, and the feeding trough 5 are strictly coaxially arranged. The rotating shaft 12 is made of 45# steel and heat-treated, combined with a high-precision deep groove ball bearing, ensuring that the radial runout error of the rotating shaft 12 is controlled within 0.02mm, significantly improving rotational stability. Furthermore, a rotating shaft 12 is installed at the output end of the stepper motor 11 via a flexible coupling. Six sets of flaps 13 are evenly welded on the surface of the rotating shaft 12. A 2mm thick polyurethane wear-resistant pad is fixedly bonded to the edge of the flap 13. The wear-resistant pad has a Shore hardness of 80A and has good wear resistance and elasticity.

[0029] A 200L water tank 6 is mounted on one side of the twin-screw granulator body 1 via a bracket. The water tank 6 contains softened purified water, effectively preventing nozzle clogging. A centrifugal pump 7 is threadedly installed on the bottom of the water tank 6. This pump has a flow rate of 15L / min and a head of 10m. Its input end is connected to the bottom of the water tank 6 via a 12mm inner diameter high-pressure suction pipe, and its output end is connected to a distribution pipe 9 via a 16mm outer diameter water delivery pipe 8. Two sets of Y-shaped diversion pipes 9 extend upwards to both sides of the hopper 2. Spray pipes 10 are welded to the surface of the diversion pipes 9. There are 8 sets of spray pipes 10 and nozzles 15. The distance between adjacent spray pipes is 100mm. The nozzles are fan-shaped atomizing nozzles with an atomization angle of 90°. During feed pelleting, the feed raw materials are placed in the hopper 2 above the feed plate 3. The stepper motor 11 drives the rotating shaft 12 to rotate at a speed of 5rpm, which drives the flip plate 13 to rotate synchronously. The feed raw materials falling between the flip plates 13 are evenly added to the main body 1 of the twin-screw pellet mill at a stable flow rate of 15kg per minute as the flip plate 13 rotates. After multiple tests, this structural design can reduce the probability of raw material accumulation at the twin-screw feed inlet by 85%, effectively avoid the problem of blockage of the twin-screw pellet mill caused by the accumulation of feed raw materials, and significantly improve the stability of pelleting. Meanwhile, the vibration motor 4 is started during the feeding process. The vibration motor 4 is a YZU-2-2 type with a vibration frequency of 50Hz and an excitation force of 2kN. The vibration generated helps the feed materials slide into the flaps 13. According to actual tests, the flap filling rate under vibration increased from 70% to 95%, which makes it easier for the feed materials to fill the flaps 13, ensuring the stability of feeding when the flaps 13 are turned, and improving the uniformity of feeding and work efficiency.

[0030] Please refer to Figure 1 and Figure 3 The spray nozzle 10 extends through the inside of the hopper 2, with a 45° angled inclination through the bottom inclined section of the hopper 2. The nozzles 15 are located on both sides below the feeding trough 5, forming a cross-spray coverage area. Water is sprayed from both sides of the feed raw materials to humidify them. Compared with single-sided spraying, the humidification efficiency is increased by 40%, expanding the humidification range and efficiency, and improving work efficiency. When the feed raw materials slide out of the discharge port 14, the water pump 7 starts, drawing water from the water tank 6 and sending it through the water supply pipe 8 and the diversion pipe 9 into the spray nozzle 10. The water is then sprayed along the nozzles 15 onto the surface of the feed raw materials to humidify them, increasing the moisture content from the initial 12% to the optimal pelleting range of 16%-18%. This avoids the problem of poor pelleting stability caused by overly dry feed raw materials. At the same time, by adding water later, the feed raw materials above the feed plate 3 are kept in a dry state, facilitating recycling and storage. In addition, the dry feed raw materials fall more stably. Tests show that the adhesion to the inner wall is reduced by 70%, improving the stability of feeding.

[0031] Please refer to Figure 1 and Figure 3 The tilt angle of the material plate 3 is designed to be 30°, and four sets of vibration motors 4 are fixedly installed on the bottom surface of the material plate 3 by bolts. The power of the vibration motors 4 is calculated and set to 0.1kW. After dynamic simulation verification, this power setting will not interfere with the normal operation of the rotating shaft 12 and the flip plate 13.

[0032] Please refer to Figure 1 and Figure 3 The rotating shaft 12 is coaxially arranged with the feeding trough 5, and the rotating shaft 12 is rotatably connected to the side wall of the hopper 2 through a 6205 type sealed bearing. The bearing adopts a double-sided sealing structure and the protection level reaches IP65, which effectively prevents dust from entering and improves the rotation stability of the rotating shaft 12.

[0033] Please refer to Figure 1 and Figure 3 There are 6 sets of flaps 13 distributed at equal angles along the central axis of the rotating shaft 12, and the edge of flap 13 slides against the inner wall of the feeding trough 5. Specifically, the wear-resistant pad on the edge of flap 13 slides against the inner wall of the feeding trough 5. While ensuring the sealing effect, after 200 hours of continuous operation test, the wear of the feeding trough 5 and the edge of flap 13 is only 0.3mm, which plays a good role in sealing and wear resistance.

[0034] Please refer to Figure 1 and Figure 3 The bottom surface of the feeding trough 5 is provided with a discharge port 14, which is located above the nozzle 15. The length of the discharge port 14 is equal to the length of the feeding trough 5, and the width is designed to be 80mm to facilitate the discharge of feed raw materials. The edges of the discharge port 14 are rounded to avoid material jamming.

[0035] Please refer to Figure 2 and Figure 4 The top surface of water tank 6 has a 50mm diameter water inlet. Water tank 6 is made of transparent PC material with a light transmittance of 90%, making it easy to observe the remaining water. When the water level is lower than the set minimum water level line, the float-type liquid level switch installed in the water tank will sound an alarm, so that the staff can add water in time.

[0036] Working Principle: During feed pelleting, feed ingredients are placed in the hopper 2 above the feed plate 3. The stepper motor 11 drives the rotating shaft 12 to rotate according to a preset program, which in turn drives the flip plate 13 to rotate. The feed ingredients falling between the flip plates 13 are evenly fed into the twin-screw pellet mill body 1 as the flip plates 13 rotate, effectively preventing feed ingredient accumulation and blockage of the twin-screw pellet mill body 1, thus improving pelleting stability. Simultaneously, the vibration motor 4 starts during feed ingredient feeding, and the resulting vibration promotes smoother sliding of the feed ingredients between the flip plates 13, ensuring feeding stability when the flip plates 13 rotate, improving feeding uniformity and work efficiency. When the feed ingredients slide out of the discharge port 14, the water pump 7 starts, drawing water from the water tank 6 and channeling it through the water pipe 8 and the diversion pipe 9 into the spray pipe 10. The water is then sprayed onto the surface of the feed ingredients along the nozzle 15, humidifying the feed ingredients and increasing their moisture content, thereby preventing the feed ingredients from becoming too dry and causing poor pelleting stability later. The innovative design of adding water after feeding keeps the feed ingredients above the feed plate 3 dry, which facilitates recycling and storage, ensures stable falling of the dry feed ingredients, reduces adhesion to the inner wall, and comprehensively improves the stability of feeding and pelleting efficiency.

[0037] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A twin-screw pellet mill for feed, comprising a twin-screw pellet mill body and a hopper, characterized in that, The twin-screw granulator has a hopper connected to its main body at the feed end, and a material plate is fixedly installed inside the hopper. A feeding trough is fixedly connected to the bottom surface of the material plate. A stepper motor is fixedly installed on the front of the hopper, and a rotating shaft is installed at the output end of the stepper motor. A flap is fixedly installed on the surface of the rotating shaft. A water tank is installed on one side of the twin-screw granulator, and a water pump is connected to the bottom of the water tank. A diversion pipe is connected to the output end of the water pump through a water supply pipe, and a nozzle is connected to the surface of the diversion pipe through a spray pipe.

2. The feed twin-screw pellet mill according to claim 1, characterized in that, The nozzle extends through the inside of the hopper, and the nozzles are located on both sides below the feeding trough.

3. The feed twin-screw pellet mill according to claim 1, characterized in that, The material plate is arranged at an angle, and a vibration motor is fixedly installed on the bottom surface of the material plate.

4. A twin-screw pellet mill for feed according to claim 1, characterized in that, The rotating shaft is coaxially arranged with the feeding trough, and the rotating shaft is rotatably connected to the side wall of the hopper through a sealed bearing.

5. A twin-screw pellet mill for feed according to claim 1, characterized in that, The flaps are distributed in multiple sets at equal angles along the central axis of the rotation shaft, and the edges of the flaps slide against the inner wall of the feeding trough.

6. A twin-screw pellet mill for feed according to claim 1, characterized in that, The bottom surface of the feeding trough is provided with a discharge port, which is located above the nozzle.

7. A twin-screw pellet mill for feed according to claim 1, characterized in that, The water tank has a water inlet on its top surface.

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