An extruded pellet feed processing equipment

Abstract

This invention discloses an extruded pellet feed processing device, comprising a support unit, and an extrusion unit, a feeding unit, a control unit, a rotary cutting unit, and a pressure sensing unit mounted on the support unit. The extrusion unit includes a screw assembly located inside the barrel. The screw assembly includes an octagonal hollow shaft. A first fixed screw structure is fixedly connected to one end of the octagonal hollow shaft, and a compensating screw structure is fixed to the other end. The variable-pitch screw structure is connected to a second fixed screw structure, slidably connected to the octagonal hollow shaft, and located between the first fixed screw structure and the compensating screw structure. The variable-pitch screw structure and the compensating screw structure are made of elastic metal material. The pressure sensing unit detects the pressure within the extrusion unit and controls the compression or extension of the variable-pitch screw structure based on the pressure, thereby adjusting the pitch of the variable-pitch screw structure to ensure that different types of materials can be fully extruded, kneaded, and cooked.

Description

Technical Field

[0001] This invention relates to feed processing technology, and more particularly to an extruded pellet feed processing device. Background Technology

[0002] Existing extrusion methods employ single-screw or twin-screw structures, using a spiral feeding mechanism to gradually compress the straw volume at the outlet, generating high temperature and pressure to achieve straw extrusion. However, existing extrusion equipment suffers from low extrusion efficiency, uneven extruded material quality, and poor material maturation.

[0003] Existing technologies, such as CN107969725A, use a stepped variable-pitch spiral structure instead of a traditional transmission spiral structure. At the feed inlet of the twin screw, a double-headed spiral structure with a double spiral diameter and large pitch is used. The large pitch increases the material feed rate, and the double-headed spiral ensures more uniform feeding. Three positive kneading blocks arranged in the forward spiral direction are added to the discharge end of the double-headed spiral structure with a double spiral diameter and large pitch, which evenly disperses and kneads the material. A 1.5 times double spiral structure is connected to the discharge end of the three positive kneading blocks as a conveying spiral, which naturally pressurizes the material and increases its mechanical energy. A first-stage three-positive-three-reverse kneading block is set at the discharge end of the 1.5 times double spiral structure, further dispersing the material while increasing discharge resistance, achieving the effects of kneading and increasing mechanical energy, resulting in more thorough material processing.

[0004] The forming quality and grade of screw extrusion puffed feed are related to the pressure, temperature and shear rate of the material inside the screw. Different types of materials have different variable thresholds inside the screw. Therefore, for different types of materials, it is necessary to re-develop reasonable and effective extrusion puffing processes and related equipment. Summary of the Invention

[0005] To address the shortcomings of the existing technology, this invention proposes an extruded pellet feed processing device. By installing a pressure sensor at one end to detect the pressure inside the processing device, the screw pitch is adjusted according to the pressure to improve the kneading efficiency and make the material more fully cooked.

[0006] The technical solution of this invention is implemented as follows:

[0007] An extruded pellet feed processing device includes a support unit, and an extrusion unit, a feeding unit, a control unit, a rotary cutting unit, and a pressure sensing unit mounted on the support unit, characterized in that...

[0008] The puffing unit includes a first motor, a distribution assembly, a barrel, and a screw assembly. The screw assembly is located inside the barrel. The output shaft of the first motor is connected to the screw assembly via the distribution assembly. The screw assembly includes an octagonal hollow shaft. A first fixed screw structure, a variable pitch screw structure, a second fixed screw structure, and a compensating screw structure are sequentially mounted on the octagonal hollow shaft. The first fixed screw structure is fixedly connected to one end of the octagonal hollow shaft, and the compensating screw structure is fixed to the other end of the octagonal hollow shaft. The variable pitch screw structure is connected to the second fixed screw structure, slidably connected to the octagonal hollow shaft, and located between the first fixed screw structure and the compensating screw structure. The variable pitch screw structure and the compensating screw structure are made of elastic metal material.

[0009] The feeding unit is used to feed materials into the extrusion unit;

[0010] The rotary cutting unit is used to granulate the material fed from the extrusion unit;

[0011] The pressure sensing unit is installed on one side of the barrel to detect the pressure inside the expansion unit and control the compression or tension of the variable pitch screw structure according to the pressure inside the expansion unit, thereby adjusting the pitch of the variable pitch screw structure.

[0012] In this invention, the pitch of the first fixed screw structure is J1, the pitch of the second fixed screw structure is J3, and the pitch of the variable pitch screw structure is J2, where J1 > J3 > J2.

[0013] The first fixed screw structure, the variable pitch screw structure, the second fixed screw structure, and the compensating screw structure are all provided with an octagonal sleeve. The first fixed screw structure, the variable pitch screw structure, the second fixed screw structure, and the compensating screw structure are connected to the octagonal hollow shaft through the octagonal sleeve. The first fixed screw structure, the variable pitch screw structure, the second fixed screw structure, and the compensating screw structure are also provided with grooves.

[0014] In this invention, a first kneading structure is fixedly connected to one end of the first fixed screw structure, a second kneading structure is connected to one end of the variable pitch screw structure and to the other end of the first kneading structure, the second kneading structure is connected to the second fixed screw structure, a third kneading structure is fixedly connected to one end of the second fixed screw structure away from the second kneading structure, and a compensation screw structure is located at the end of the octagonal hollow shaft, one end of the compensation screw structure is fixedly connected to the end of the octagonal hollow shaft and the other end is fixedly connected to the third kneading structure.

[0015] In this invention, a sliding shaft is installed inside the octagonal hollow shaft. The sliding shaft is keyed to the octagonal hollow shaft. Keyways are provided at both ends of the octagonal hollow shaft. The sliding shaft consists of a long shaft and several key blocks. A first key block is provided at the end of the long shaft furthest from the first motor, and a second key block is provided at the end closest to the first motor. The first and second key blocks are slidably connected to the keyways on the octagonal hollow shaft.

[0016] The first flat key block is fixedly connected to the second kneading structure. The sliding shaft slides inside the eight-sided hollow shaft, which will drive the second kneading structure, the second fixed screw structure and the third kneading structure to slide on the eight-sided hollow shaft. During the sliding process, the variable pitch screw structure and the compensation screw structure are compressed or stretched.

[0017] In this invention, the dispensing assembly includes a base, with a first flange and a second flange at both ends. The first flange has a port, and an octagonal hollow shaft is mounted on the port via bearings and connected to the output shaft of a first motor.

[0018] A sliding groove is installed on the lower inner wall of the base, and a sliding ring is installed on the sliding groove. An adjusting cylinder is installed on the upper inner wall of the base, and the output shaft of the adjusting cylinder abuts against the upper end of the sliding ring.

[0019] In this invention, the sliding ring is composed of a ring, an upper end, and a lower end, which are integrally formed. The lower end has protrusions on both sides, which are connected to the sliding groove. The output shaft of the adjusting cylinder abuts against the upper end. A circular groove is also provided inside the ring. The second flat key block is located in the central groove and rotates within the central groove. The movement of the sliding ring is driven by the second flat key block to move the sliding shaft together.

[0020] In this invention, a roller is provided on the second flat key block, and the roller is located in the central groove. The roller is used to reduce the friction between the second flat key block and the central groove.

[0021] In this invention, the sliding groove has several positioning holes on both sides, and the lower end of the sliding ring is provided with a locking rod. The locking rod is slidably connected to both sides of the lower end by a reset spring, and the locking rod is located in one of the positioning holes.

[0022] In this invention, the rotary cutting unit includes a mounting plate, a drive motor, and a rotary cutting blade. The mounting plate is fixedly connected to one end of the barrel, the drive motor is fixed to one side of the mounting plate, and the output shaft of the drive motor is fixedly connected to the rotary cutting blade. The drive motor drives the rotary cutting blade to rotate, and the rotary cutting blade cuts the puffed material output from the barrel to produce puffed feed pellets.

[0023] In this invention, the pressure sensing unit includes a sealing disc, a detection probe, a sensor, and a connector. The sealing disc is fixedly installed at one end of the barrel, the detection probe is installed inside the sealing disc, one end of the detection probe is connected to the sensor, and one end of the sensor is also provided with a connector, one end of which is connected to the distribution assembly.

[0024] The extruded pellet feed processing equipment of this invention has the following beneficial effects:

[0025] This invention installs a pressure sensing unit in the barrel to detect the pressure inside the puffing unit and controls the compression or tension of the variable pitch screw structure based on the pressure inside the puffing unit, thereby adjusting the pitch of the variable pitch screw structure. This allows different types of materials to be fully extruded, kneaded, and cooked, solving the problem that existing puffing equipment requires a new extrusion puffing process for different types of materials. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the extruded pellet feed processing equipment of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of the puffing unit of the present invention;

[0028] Figure 3 This is a partial cross-sectional view of the puffing unit of the present invention;

[0029] Figure 4 This is a partially obscured view of the screw assembly of the present invention;

[0030] Figure 5 This is a schematic diagram of the first fixing screw structure of the present invention;

[0031] Figure 6 This is a schematic diagram of the variable pitch screw structure of the present invention;

[0032] Figure 7 This is a schematic diagram of the second fixing screw structure of the present invention;

[0033] Figure 8 This is a schematic diagram of the compensation screw structure of the present invention;

[0034] Figure 9 This is a partial cross-sectional view of the screw assembly of the present invention;

[0035] Figure 10 A partial cross-sectional view of the components allocated in this invention;

[0036] Figure 11 This is a schematic diagram of the sliding ring structure of the present invention.

[0037] The reference numerals in the attached drawings are as follows: 10-support unit, 20-expansion unit, 21-first motor, 22-connecting plate, 23-distribution assembly, 231-base, 232-first flange, 233-port, 234-second flange, 235-adjusting cylinder, 236-sliding ring, 237-sliding groove, 238-positioning hole. 24-Barrel, 25-Feed inlet, 26-Support frame, 27-Screw assembly, 271-First fixed screw structure, 272-First kneading structure, 273-Variable pitch screw structure, 274-Second kneading structure, 275-Second fixed screw structure, 276-Third kneading structure, 277-Compensating screw structure, 278-Eight-sided hollow shaft, 279-Sliding shaft, 30-Feeding unit, 31-Second motor, 32-Feeder, 33-Feeding port, 40-Control unit, 50-Vessel cutting unit, 51-Mounting plate, 52-Drive motor, 53-Vessel cutting blade, 60-Pressure sensing unit, 61-Sealing disc, 62-Detection probe, 63-Sensor, 64-Connector. Detailed Implementation

[0038] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0039] like Figure 1 As shown, the extruded pellet feed processing equipment of the present invention includes a support unit 10, an extrusion unit 20, a feeding unit 30, a control unit 40, a rotary cutting unit 50, and a pressure sensing unit 60. The extrusion unit 20 is mounted on the upper surface of the support unit 10.

[0040] like Figures 2 to 11 As shown, the puffing unit 20 includes a first motor 21, a connecting plate 22, and a distribution assembly 23. The output shaft of the first motor 21 passes through the connecting plate 22 and is connected to the distribution assembly 23. A cylinder 24 is located at the end of the distribution assembly 23 furthest from the first motor 21. A feed inlet 25 is located at the top of the cylinder 24, which is connected to the feeding unit 30. The material to be puffed is fed into the cylinder 24 through the feed inlet 25. A support frame 26 is located at the end of the cylinder 24 furthest from the first motor 21, ensuring the stable installation of the cylinder 24. A screw assembly 27 is also installed inside the cylinder 24. The output shaft of the first motor 21 drives the screw assembly 27 to rotate via the distribution assembly 23. The screw assembly 27 is used to transport, compress, and puff the material.

[0041] The feeding unit 30 is located above the puffing unit 20 and is used to feed materials into the puffing unit 20. The feeding unit 30 includes a second motor 31 and a feeder 32. The output shaft of the second motor 31 is connected to the feeder 32, and one end of the feeder 32 is provided with a feeding port 33, which is connected to the feed inlet 25.

[0042] like Figure 4 , Figure 9 As shown, the screw assembly 27 includes an octagonal hollow shaft 278, which is connected to the output shaft of the first motor 21. The octagonal hollow shaft 278 is sequentially mounted with a first fixed screw structure 271, a first kneading structure 272, a variable pitch screw structure 273, a second kneading structure 274, a second fixed screw structure 275, a third kneading structure 276, and a compensating screw structure 277. The first fixed screw structure 271 and the first kneading structure 272 are fixedly connected to the octagonal hollow shaft 278. The variable pitch screw structure 273 and the second kneading structure 274 are slidably connected to the octagonal hollow shaft 278. One end of the variable pitch screw structure 273 is fixedly connected to the first kneading structure 272, and the other end is fixedly connected to the second kneading structure 274. The second fixing screw structure 275 is fixedly connected to the end of the second kneading structure 274 away from the variable pitch screw structure 273. The end of the second fixing screw structure 275 away from the second kneading structure 274 is also fixedly connected to a third kneading structure 276. The compensating screw structure 277 is located at the end of the octagonal hollow shaft 278. One end of the compensating screw structure 277 is fixedly connected to the end of the octagonal hollow shaft 278, and the other end is fixedly connected to the third kneading structure 276. The variable pitch screw structure 273 and the compensating screw structure 277 are made of elastic metal material.

[0043] like Figure 9 As shown, a sliding shaft 279 is also installed inside the octagonal hollow shaft 278, and the sliding shaft 279 is in parallel key engagement with the octagonal hollow shaft 278. Both ends of the octagonal hollow shaft 278 are provided with keyways 278'1. The sliding shaft 279 consists of a long shaft 279'1 and several key blocks. A first key block 279'2 is provided at the end of the long shaft 279'1 furthest from the first motor 21, and a second key block 279'3 is provided at the end closer to the first motor 21. The first key block 279'2 and the second key block 279'3 are slidably connected to the keyways 278'1 on the octagonal hollow shaft 278. The first flat key block 279'2 is fixedly connected to the second kneading structure 274. The sliding shaft 279 slides inside the octagonal hollow shaft 278, which will drive the second kneading structure 274, the second fixed screw structure 275 and the third kneading structure 276 to slide on the octagonal hollow shaft 278. During the sliding process, the variable pitch screw structure 273 and the compensation screw structure 277 will be compressed or stretched.

[0044] The distribution component 23 is used to control the sliding shaft 279 to slide within the octagonal hollow shaft 278. For example... Figures 10 to 11As shown, the distribution assembly 23 includes a base 231, with a first flange 232 and a second flange 234 at both ends. A port 233 is provided on the first flange 232. An octagonal hollow shaft 278 is mounted on the port 233 via bearings and connected to the output shaft of the first motor 21. A sliding groove 237 is installed on the lower inner wall of the base 231, and a sliding ring 236 is installed on the sliding groove 237. An adjusting cylinder 235 is installed on the upper inner wall of the base 231, with the output shaft of the adjusting cylinder 235 abutting against the upper end of the sliding ring 236.

[0045] like Figure 11 As shown, the sliding ring 236 consists of a ring 236'1, an upper end 236'2, and a lower end 236'4. The ring 236'1, upper end 236'2, and lower end 236'4 are integrally formed. The lower end 236'4 has protrusions on both sides, which connect to the sliding groove 237 to ensure the stability of the sliding ring 236. The output shaft of the adjusting cylinder 235 abuts against the upper end 236'2, further ensuring the stability of the sliding ring 236. A circular groove 236'3 is also provided inside the ring 236'1. The second flat key block 279'3 is located within the circular groove 236'3 and rotates within it. The movement of the sliding ring 236 will cause the sliding shaft 279 to move along with it via the second flat key block 279'3.

[0046] In this embodiment, the material to be expanded is fed into the feeder 32, and the second motor 31 is started to intermittently feed the material into the barrel 24 through the feed inlet 25. At this time, the first motor 21 is started, driving the screw assembly 27 to rotate via the connecting plate 22 and the distribution component 23. The screw assembly 27 conveys and compresses the material. For example, Figure 9 As shown, the pitch of the first fixed screw structure 271 is twice that of the second fixed screw structure 275. When material is transported by the first fixed screw structure 271, its residence time within the barrel 24 can be increased, improving the material's maturation function. For example... Figure 10As shown, the variable pitch screw structure 273 is in a compressed state, and the compensating screw structure 277 is in a stretched state. The output shaft of the adjusting cylinder 235 is in an extended state, and the output shaft of the adjusting cylinder 235 abuts against the upper end of the sliding ring 236 to prevent the variable pitch screw structure 273 and the compensating screw structure 277 from resetting and causing the sliding shaft 279 to move closer to the compensating screw structure 277. Relying solely on the adjusting cylinder 235 to prevent the variable pitch screw structure 273 and the compensating screw structure 277 from resetting may damage the adjusting cylinder 235. Therefore, several positioning holes 238 are provided on both sides of the sliding groove 237, and a locking rod 236'5 is provided on the lower end 236'4 of the sliding ring 236. The locking rod 236'5 is slidably connected to both sides of the lower end 236'4 via a return spring 236'6. The locking rod 236'5 is located in one of the positioning holes 238. Through the cooperation between the locking rod 236'5 and the positioning hole 238, the variable pitch screw structure 273 and the compensation screw structure 277 are further restricted from resetting, preventing the adjustment cylinder 235 from being damaged by relying solely on the adjustment cylinder 235.

[0047] Furthermore, the second flat key block 279'3 on the sliding shaft 279 is rotatably connected to the central groove 236'3. In order to reduce the friction between the second flat key block 279'3 and the central groove 236'3, a roller 279'4 is provided on the second flat key block 279'3. The roller 279'4 reduces the friction that occurs when the second flat key block 279'3 rotates with the central groove 236'3.

[0048] Both the rotary cutting unit 50 and the pressure sensing unit 60 are installed on one side of the extrusion unit 20. The rotary cutting unit 50 is used to cut the material output from the extrusion unit 20 to produce extruded feed pellets. The rotary cutting unit 50 includes a mounting plate 51, a drive motor 52, and a rotary cutting blade 53. The mounting plate 51 is fixedly connected to one end of the barrel 24, and the drive motor 52 is fixedly connected to one side of the mounting plate 51. The output shaft of the drive motor 52 is fixedly connected to the rotary cutting blade 53. The drive motor 52 drives the rotary cutting blade 53 to rotate, and the rotary cutting blade 53 cuts the extruded material output from the barrel 24 to produce extruded feed pellets.

[0049] A pressure sensing unit 60 is installed on one side of the barrel 24 to detect the pressure inside the expansion unit 20. The pressure sensing unit 60 includes a sealing disc 61, a detection probe 62, a sensor 63, and a connector 64. The sealing disc 61 is fixedly installed at one end of the barrel 24. The detection probe 62 is installed inside the sealing disc 61, and one end of the detection probe 62 is connected to the sensor 63. A connector 64 is also provided at one end of the sensor 63. One end of the connector 64 is connected to the dispensing assembly 23.

[0050] In this embodiment, the detection probe 62 is located inside the barrel 24 and is used to detect the pressure inside the barrel 24. When the detection probe 62 detects that the pressure inside the barrel 24 exceeds a set value, the sensor 63 controls the regulating cylinder 235 to contract and controls the two locking rods 236'4 to move towards each other, causing the locking rods 236'4 to disengage from the positioning hole 238 and no longer restrict the movement of the sliding ring 236. The variable pitch screw structure 273 resets and changes its pitch to improve the kneading efficiency and make the material more fully cooked. The pitch adjustment range of the variable pitch screw structure 273 is between the first fixed screw structure 271 and the second fixed screw structure 275. Electromagnets that attract each other can be set at both ends of the locking rods 236'4. The sensor 63 controls the electromagnets to be energized, thereby causing the locking rods 236'4 to move towards each other and disengage from the positioning hole 238.

[0051] Specifically, such as Figures 5 to 8 As shown, the first fixed screw structure 271 has a length of L1 and a pitch of J1, while the second fixed screw structure 275 has a length of L3 and a pitch of J3. The lengths L1 and L3 of both the first and second fixed screw structures are fixed. The pitch J1 of the first fixed screw structure 271 is twice the pitch J3 of the second fixed screw structure 275. The variable pitch screw structure 273 has a length of L2, which varies with the compression elongation of the variable pitch screw structure 273. The pitch J2 of the variable pitch screw structure 273 also varies with the compression elongation of the variable pitch screw structure 273, with J1 > J3 > J2. The variable pitch screw structure 273 is used to adjust the pitch according to the pressure inside the barrel 24, ensuring that different types of materials can be fully extruded, kneaded, and matured, thus addressing the deficiency of existing extrusion equipment that requires a completely new extrusion and extrusion process for different types of materials.

[0052] The compensating screw structure 277 has a length of L4 and a pitch of J4. The length L4 of the compensating screw structure 277 changes with the compression elongation of the compensating screw structure 277, and the pitch J4 of the compensating screw structure 277 also changes with the compression elongation of the compensating screw structure 277. The compensating screw structure 277 is used to ensure that when the variable pitch screw structure 273 is compressed or stretched, the screw can still transport the material out of the barrel 24.

[0053] Furthermore, such as Figures 5 to 8As shown. The first fixed screw structure 271, the variable pitch screw structure 273, the second fixed screw structure 275, and the compensating screw structure 277 are all equipped with an octagonal sleeve a. These structures are connected to the octagonal hollow shaft 278 via the octagonal sleeve a. Each of the three structures also has a groove b, which slows down the material conveying speed, acts as a backflow mechanism, and prolongs the material's maturation time within the cavity.

[0054] In this embodiment, after the material enters the barrel 24, it is transported by the first fixed screw structure 271. The first fixed screw structure 271 is a screw with a double pitch. The large pitch of the first fixed screw structure 271 can increase the material feeding capacity and make the feeding more uniform. One end of the first fixed screw structure 271 is connected to the first kneading structure 272, which consists of five kneading blocks arranged at a 45° clockwise direction of the spiral, used to evenly disperse and knead the material. One end of the first kneading structure 272 is connected to the variable pitch screw structure 273, which can naturally pressurize the material and improve its mechanical energy. One end of the variable pitch screw structure 273 is connected to the second kneading structure 274, which consists of three kneading blocks arranged at a 45° clockwise direction of the spiral, further dispersing the material and increasing the discharge resistance, achieving the effects of kneading and improving mechanical energy. One end of the second kneading structure 274 is connected to a second fixed screw structure 275, which is a single-pitch screw that applies secondary pressure to the material, increasing its mechanical energy. The other end of the second fixed screw structure 275 is equipped with a third kneading structure 276, which consists of two kneading blocks arranged at a 45° clockwise spiral direction, ultimately breaking up the material. The material, after being broken up and kneaded by the third kneading structure 276, is output by the compensating screw structure 277.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A puffed pellet feed processing equipment, comprising a support unit, a puffing unit, a feeding unit, a control unit, a rotary cutting unit and a pressure sensing unit mounted on the support unit, characterized in that, the puffing unit comprises a first motor, a distribution assembly, a barrel and a screw assembly, the screw assembly is located inside the barrel, the output shaft of the first motor is connected with the screw assembly through the distribution assembly, the screw assembly comprises an eight-surface hollow shaft, a first fixed screw structure, a variable pitch screw structure, a second fixed screw structure and a compensation screw structure are sequentially mounted on the eight-surface hollow shaft, the first fixed screw structure is fixedly connected at one end of the eight-surface hollow shaft, the compensation screw structure is fixed at the other end of the eight-surface hollow shaft, the variable pitch screw structure is connected with the second fixed screw structure and is slidingly connected on the eight-surface hollow shaft and located between the first fixed screw structure and the compensation screw structure, wherein the variable pitch screw structure and the compensation screw structure are made of elastic metal material; the feeding unit is used for feeding materials into the puffing unit; the rotary cutting unit is used for making the materials sent out by the puffing unit into pellets; the pressure sensing unit is installed on one side of the barrel and is used for detecting the pressure in the puffing unit and controlling the variable pitch screw structure to compress or stretch according to the pressure in the puffing unit so as to adjust the pitch of the variable pitch screw structure.

2. The expanded pellet feed processing apparatus according to claim 1, characterized by the pitch of the first fixed screw structure is J1, the pitch of the second fixed screw structure is J3, and the pitch of the variable pitch screw structure is J2, J1 > J3 > J2, wherein, the first fixed screw structure, the variable pitch screw structure, the second fixed screw structure and the compensation screw structure are all provided with an eight-surface sleeve, the first fixed screw structure, the variable pitch screw structure, the second fixed screw structure and the compensation screw structure are connected with the eight-surface hollow shaft through the eight-surface sleeve, and the first fixed screw structure, the variable pitch screw structure, the second fixed screw structure and the compensation screw structure are all provided with grooves.

3. The expanded pellet feed processing apparatus according to claim 1, wherein one end of the first fixed screw structure is fixedly connected with a first rubbing structure, one end of the variable pitch screw structure is connected with the first rubbing structure, the other end is connected with a second rubbing structure, the second rubbing structure is connected with the second fixed screw structure, one end of the second fixed screw structure away from the second rubbing structure is also fixedly connected with a third rubbing structure, and one end of the compensation screw structure at the end of the eight-surface hollow shaft is fixedly connected with the third rubbing structure.

4. The expanded pellet feed processing apparatus according to claim 3, wherein a sliding shaft is installed inside the eight-surface hollow shaft, the sliding shaft is in flat key cooperation with the eight-surface hollow shaft, both ends of the eight-surface hollow shaft are provided with flat key grooves, the sliding shaft is composed of a long shaft and a plurality of flat key blocks, one end of the long shaft away from the first motor is provided with a first flat key block, one end close to the first motor is provided with a second flat key block, and the first flat key block and the second flat key block are respectively slidingly connected with the flat key grooves on the eight-surface hollow shaft, wherein the first flat key block is fixedly connected with the second rubbing structure, the sliding shaft slides in the eight-surface hollow shaft and drives the second rubbing structure, the second fixed screw structure and the third rubbing structure to slide on the eight-surface hollow shaft, and the variable pitch screw structure and the compensation screw structure are compressed or stretched in the sliding process.

5. The expanded pellet feed processing apparatus according to claim 4, wherein The distribution assembly comprises a base, first and second flanges are arranged at two ends of the base, a port is arranged on the first flange, an eight-surface hollow shaft is mounted on the port through a bearing and is connected with an output shaft of a first motor, wherein, A sliding groove is mounted on an inner wall of the base, a sliding ring is mounted on the sliding groove, an adjusting cylinder is mounted on an upper inner wall of the base, and an output shaft of the adjusting cylinder abuts against an upper end of the sliding ring.

6. The expanded pellet feed processing apparatus according to claim 5, wherein The sliding ring is composed of a ring, an upper end and a lower end, and the ring, the upper end and the lower end are integrally formed, the lower end has protrusions on both sides, the protrusions are connected with the sliding groove, the output shaft of the adjusting cylinder abuts against the upper end, a circular groove is arranged in the ring, a second flat key block is located in the circular groove and rotates in the circular groove, and the sliding ring moves to drive the sliding shaft to move through the second flat key block.

7. The expanded pellet feed processing apparatus according to claim 6, wherein A roller is arranged on the second flat key block and located in the circular groove, and the roller is used to reduce the friction between the second flat key block and the circular groove.

8. The expanded pellet feed processing apparatus according to claim 7, wherein A plurality of positioning holes are arranged on both side walls of the sliding groove, a clamping rod is arranged on the lower end of the sliding ring, the clamping rod is slidably connected to both sides of the lower end through a reset spring, and the clamping rod is located in one of the positioning holes.

9. The expanded pellet feed processing apparatus according to claim 1, 2 or 8, characterized by The rotary cutting unit comprises a mounting plate, a driving motor and a rotary cutter, the mounting plate is fixedly connected to one end of the cylinder, the driving motor is fixedly connected to one side of the mounting plate, an output shaft of the driving motor is fixedly connected with the rotary cutter, the driving motor drives the rotary cutter to rotate, the rotary cutter cuts the expanded material output by the cylinder to produce expanded feed pellets.

10. The expanded pellet feed processing apparatus according to claim 1, 2 or 8, characterized by The pressure sensing unit comprises a sealing disc, a detection probe, a sensor and a connecting head, the sealing disc is fixedly mounted on one end of the cylinder, the detection probe is mounted in the sealing disc, one end of the detection probe is connected with the sensor, and one end of the sensor is further provided with a connecting head, and one end of the connecting head is connected with the distribution assembly.

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