Screw structure of bulking machine for feed production

Abstract

The invention relates to a screw rod structure of a bulking machine for feed production, and belongs to the technical field of feed production, the screw rod structure of the bulking machine for feed production comprises a plurality of screw rod units and a pressure ring, the plurality of screw rod units are connected in sequence, and the pressure ring is connected with the screw rod units. The screw pitch of the screw unit close to one side of the discharge port of the extrusion barrel is smaller than that of the screw unit close to one side of the feed port of the extrusion barrel, the pressure rings are detachably arranged between the adjacent screw units, the outer walls of the pressure rings are conical surfaces, and the diameters of the conical surfaces are gradually increased in the direction away from the feed port. A plurality of guide grooves are formed in the conical surface of the pressure ring and are distributed at intervals in the circumferential direction of the corresponding pressure ring. The feed bulking machine has the effects of prolonging the residence time of materials in the extrusion cylinder of the bulking machine, improving the gelatinization degree of feed with high requirement on the gelatinization degree, and ensuring the quality of final products to a certain extent.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of feed production, in particular to a screw structure of a feed production bulking machine. BACKGROUND

[0002] The bulking machine is a key equipment in feed production, which bulks materials such as corn and soybeans through high temperature and high pressure to obtain feed products.

[0003] Reference Figure 1 The traditional bulking machine mainly comprises a rack 14, an extrusion barrel 15, a feeding port 16, a discharging port 17, an extrusion screw 18, a forming die plate 19, a cutter 20, a cutter driving member 21 and a driving source 22. The extrusion barrel 15 is installed on the rack 14. The feeding port 16 and the discharging port 17 are designed at two ends of the extrusion barrel 15. The extrusion screw 18 is rotationally arranged in the extrusion barrel 15. The blade pitch of the extrusion screw 18 on the side close to the discharging port 17 is smaller than the blade pitch of the extrusion screw 18 on the side close to the feeding port 16. The forming die plate 19 is installed at the discharging port 17 of the extrusion barrel 15. The cutter 20 is installed outside the forming die plate 19. The cutter driving member 21 and the driving source 22 are both installed on the extrusion barrel 15. The cutter driving member 21 is used to drive the cutter 20 to rotate. The driving source 22 is used to drive the extrusion screw 18 to rotate. The cutter driving member 21 and the driving source 22 can both adopt a motor. When working, the materials enter the extrusion barrel 15 through the feeding port 16. The extrusion screw 18 is driven to rotate by the driving source 22. The extrusion screw 18 conveys the materials towards the discharging port 17. The pressure is increased by the decreasing of the pitch of the helical blade of the extrusion screw 18. The friction and shearing force between the feed and the extrusion screw 18, between the feed and the extrusion barrel 15 and between the internal parts of the feed particles make the feed warm. Then the feed is extruded through the forming die plate 19. The feed product is obtained by cutting the rotating cutter 20.

[0004] For the traditional bulking machine, the feed will quickly pass through the forming die plate 19 at the discharging port 17 during the extrusion screw 18 propulsion process. For some feed with high gelatinization degree requirement, the gelatinization time is insufficient, which affects the quality of the final product. With the improvement of the product quality requirement of the feed industry, how to optimize the screw structure to prolong the material residence time has become one of the key directions of technical improvement. SUMMARY

[0005] In order to help prolong the residence time of the material in the extrusion barrel of the bulking machine, improve the gelatinization degree of the feed with high gelatinization degree requirement and ensure the quality of the final product to some extent, the application provides a screw structure of a feed production bulking machine.

[0006] The screw structure of the feed production bulking machine provided by the application adopts the following technical scheme: The utility model provides a screw structure of a feed production bulking machine, comprising: a plurality of screw units are sequentially connected, and the pitch of the screw unit close to the discharge port side of the extrusion cylinder is smaller than the pitch of the screw unit close to the feed inlet side of the extrusion cylinder; a pressure ring is detachably arranged between adjacent screw units, the outer wall of the pressure ring is a tapered surface, the diameter of the tapered surface increases in the direction away from the feed inlet, and a plurality of guide grooves are arranged on the tapered surface of the pressure ring and are spaced apart along the circumference of the corresponding pressure ring.

[0007] Preferably, the guide grooves are obliquely arranged, and when the screw units rotate to transport the feed towards the discharge port, the end of the guide groove away from the center of the pressure ring is inclined towards the rotation direction of the screw unit.

[0008] Preferably, the screw units are provided in three, the pressure rings are provided in two, and the length of the screw unit close to the discharge port side of the extrusion cylinder is less than one third of the length of the screw unit close to the feed inlet side of the extrusion cylinder.

[0009] Preferably, the length of the screw unit close to the feed inlet side of the extrusion cylinder is equal to the sum of the lengths of the other two screw units.

[0010] Preferably, the pressure ring away from the discharge port side of the extrusion cylinder comprises a fixed ring and a rotating ring, the fixed ring is arranged between the corresponding two screw units, the rotating ring is rotatably arranged on the side of the fixed ring away from the discharge port side of the extrusion cylinder, the tapered surface is located on the rotating ring, a plurality of feed holes are arranged on the fixed ring, a plurality of adjusting holes are arranged on the rotating ring, the adjusting holes are used for aligning or misaligning with the feed holes, and an adjusting member for adjusting the rotation of the rotating ring is arranged on the fixed ring.

[0011] Preferably, the adjusting member comprises a driving motor, a driving gear and a transmission gear segment, the driving motor is arranged in the fixed ring, the driving gear is arranged on the output shaft of the driving motor, the transmission gear segment is slidably arranged in the fixed ring, the transmission gear segment is engaged with the driving gear, the central angle of the transmission gear segment is greater than 180 degrees, a connecting part is arranged on the transmission gear segment, and the rotating ring is connected with the connecting part on the transmission gear segment.

[0012] Preferably, the feed hole group is provided with two groups, each of the feed hole groups comprises two feed hole bodies symmetrically distributed along the center of the fixed ring, the diameter of the feed hole body in one group of feed hole groups is greater than the diameter of the feed hole body in the other group of feed hole groups, the adjusting hole group comprises two adjusting hole bodies symmetrically distributed along the center of the fixed ring, and the diameter of the adjusting hole body is equal to the diameter of the feed hole body in the group of feed hole bodies with larger diameter.

[0013] Preferably, the inner diameter of the adjusting hole body decreases towards the direction close to the fixing ring, and the inner diameter of the material passing hole body decreases towards the direction close to the rotating ring.

[0014] Preferably, the outer diameter of the pressure ring is smaller than the outer diameter of the blade on the screw unit.

[0015] Preferably, the pressure ring is provided with a connecting barrel on two opposite sides, the connecting barrel is used to extend into the corresponding screw unit, and the connecting barrel is used to be detachably connected with the corresponding screw unit.

[0016] In summary, the present application has the following beneficial technical effects: When the extrusion screw composed of the plurality of screw units is rotated in the extrusion barrel, the screw unit transports the feed in the extrusion barrel towards the discharge port, and the pressure ring between the adjacent screw units helps to provide resistance to the transportation of the feed, significantly prolongs the residence time of the material in the extrusion barrel of the puffing machine, improves the gelatinization degree of the feed such as corn which has high requirement on gelatinization degree, and helps to ensure the quality of the final product; at the same time, the pressure ring can be disassembled between the adjacent screw units, so that the number of the pressure rings can be flexibly adjusted according to the gelatinization requirements of different materials, and the adaptability is stronger. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of a traditional puffing machine.

[0018] Figure 2 is a schematic diagram of the overall structure of the embodiment 1 of the present application.

[0019] Figure 3 is a schematic diagram of the local structure of the embodiment 1 of the present application.

[0020] Figure 4 is a schematic diagram of the overall structure of the pressure ring in the embodiment 1 of the present application.

[0021] Figure 5 is a schematic diagram of the overall structure of the pressure ring away from the discharge port in the embodiment 2 of the present application.

[0022] Figure 6 is an exploded view of the overall structure of the pressure ring away from the discharge port in the embodiment 2 of the present application.

[0023] Figure 7 is a schematic diagram of the overall structure of the fixing ring in the embodiment 2 of the present application.

[0024] Explanation of reference signs: 1, screw unit; 2, pressure ring; 3, conical surface; 4, guide groove; 5, fixed ring; 6, rotating ring; 7, material passage body; 8, adjusting hole body; 9, adjusting piece; 91, driving motor; 92, driving gear; 93, transmission gear segment; 10, connecting part; 11, connecting cylinder; 111, cylindrical segment; 112, hexagonal segment; 13, sliding hole; 14, rack; 15, extrusion cylinder body; 16, feed inlet; 17, discharge outlet; 18, extrusion screw; 19, forming die plate; 20, cutter; 21, cutter driving piece; 22, driving source. DETAILED DESCRIPTION

[0025] The following Figures 2-7 The application is further described in detail.

[0026] Example 1: The screw structure of the feed production extruder disclosed by the embodiments of the application. Referring to Figure 2 , the screw structure of the feed production extruder includes a plurality of screw units 1, and the plurality of screw units 1 are connected in sequence. The plurality of screw units 1 connected in sequence are used to rotate and install in the extrusion cylinder body to transport materials. Specifically, each screw unit 1 has helical blades. The pitch of the blades of the screw unit 1 near the discharge outlet side of the extrusion cylinder body is smaller than the pitch of the blades of the screw unit 1 near the feed inlet side of the extrusion cylinder body, which helps to increase the pressure on the materials in the extrusion cylinder body near the discharge outlet.

[0027] Referring to Figure 2 and Figure 3 , the pressure ring 2 is detachably arranged between adjacent screw units 1. The outer wall of the pressure ring 2 is a conical surface 3. The diameter of the conical surface 3 increases in the direction away from the feed inlet. The conical surface 3 of the pressure ring 2 has a plurality of guide grooves 4. The plurality of guide grooves 4 are uniformly and spacedly distributed along the circumference of the corresponding pressure ring 2.

[0028] When the extrusion screw formed by the plurality of screw units 1 rotates in the extrusion cylinder body, the screw unit 1 transports the feed in the extrusion cylinder body towards the discharge outlet. The provision of the pressure ring 2 helps to provide certain resistance to the transportation of the feed. However, the conical surface 3 and the guide groove 4 can guide the materials to ensure that the flowability of the materials does not appear to be residual and discharged. Therefore, the residence time of the materials in the extrusion cylinder body of the extruder is significantly prolonged, the degree of gelatinization of the feed such as corn which requires high degree of gelatinization is improved, and the quality of the final product is ensured. At the same time, since the pressure ring 2 can be disassembled between adjacent screw units 1, the number of pressure rings 2 can be flexibly adjusted according to the gelatinization requirements of different materials, and the adaptability is stronger.

[0029] Referring to Figure 2Further, the screw units 1 are three in number, the pressure rings 2 are two in number, the two screw units 1 at the two ends are of constant pitch, the pitch of the screw unit 1 at the middle position decreases towards the direction close to the discharge port, further, the pitch of the screw unit 1 close to the feeding port is greater than the pitch of the screw unit 1 at the middle position, and the pitch of the screw unit 1 at the middle position is greater than the pitch of the screw unit 1 close to the discharge port. Thus, a feeding section, a transition section and an extruding section are sequentially formed from the feeding port to the discharge port in the extruding barrel, which helps to ensure the quality of the feed product.

[0030] With reference to Figure 2 The length of the screw unit 1 close to the discharge port of the extruding barrel is less than one third of the length of the screw unit 1 close to the feeding port of the extruding barrel, so that one of the pressure rings 2 is close to the discharge port of the extruding barrel, and the feed is further pressurized at the position close to the discharge port to prepare for extrusion through the forming die plate.

[0031] With reference to Figure 2 The length of the screw unit 1 close to the feeding port of the extruding barrel is equal to the sum of the lengths of the other two screw units 1, so that the pressure ring 2 away from the discharge port is located at the middle position of the entire extruding screw, which can prolong the residence time of the material in the extruder and does not affect the smooth feeding of the material in the feeding section.

[0032] With reference to Figure 2 To ensure smooth conveying of the material, the outer diameter of the pressure ring 2 is less than the outer diameter of the blade on the screw unit 1, so that the pressure ring 2 has a certain gap with the inner wall of the extruding barrel.

[0033] With reference to Figure 3 The guide groove 4 is inclined, and when the screw unit 1 rotates to convey the feed towards the discharge port, the end of the guide groove 4 away from the center of the pressure ring 2 is inclined towards the rotation direction of the screw unit 1, specifically, Figure 3 The arrow direction at the end of the screw unit 1 is the rotation direction of the screw unit 1. The inclined guide groove 4 is designed on the conical surface 3 of the pressure ring 2, which helps to convey the material backwards along the guide groove 4 under the rotation of the pressure ring 2, ensuring smooth conveying of the material.

[0034] With reference to Figure 3 and Figure 4To realize the detachable connection of the pressure ring 2 and the screw rod unit 1, the inner wall of the screw rod unit 1 is a regular hexagon, and the pressure ring 2 is integrally formed with a connecting barrel 11 on the opposite sides, and the outer wall of the connecting barrel 11 is a regular hexagon, the connecting barrel 11 is used to extend into the corresponding screw rod unit 1, and the connecting barrel 11 is used to be detachably connected with the corresponding screw rod unit 1, specifically, the connecting barrel 11 and the corresponding screw rod unit 1 are connected through bolts, screws, threads or rivets, which is not limited here, to ensure that the pressure ring 2 is not easy to loosen when the screw rod unit 1 rotates at high speed. Through the detachable connection of the pressure ring 2 and the screw rod unit 1 on both sides, the number and position of the pressure ring 2 can be flexibly adjusted according to the gelatinization requirements of different materials, and the two ends of the adjacent screw rod units 1 can be fixedly connected through the cooperation of the barrel and the bolt after the pressure ring 2 is removed, without the need to modify other parts of the screw rod unit 1, which is flexible and easy to implement. In other embodiments, the pressure ring 2 and the screw rod unit 1 on both sides can also be fixed by welding.

[0035] The implementation principle of the embodiment 1 of the present application is that when the extrusion screw formed by the plurality of screw rod units 1 spliced in the extrusion barrel rotates, the material entering the extrusion barrel is transported towards the discharge port, the setting of the pressure ring 2 helps to provide certain resistance to the transportation of the material, and the tapered surface 3 and the inclined guide groove 4 on the pressure ring 2 can guide the material to be smoothly transported backward, significantly prolonging the residence time of the material in the extrusion barrel of the puffing machine, improving the gelatinization degree of corn and other feed with high gelatinization degree requirements, and helping to ensure the quality of the final product; at the same time, since the pressure ring 2 can be disassembled between the adjacent screw rod units 1, the number and position of the pressure ring 2 can be flexibly adjusted according to the gelatinization requirements of different materials, and the adaptability is stronger.

[0036] Embodiment 2 With reference to Figure 2 and Figure 5 The difference between the present embodiment and the embodiment 1 is that the pressure ring 2 away from the discharge port of the extrusion barrel includes a fixed ring 5 and a rotating ring 6, the fixed ring 5 is detachably arranged between the corresponding two screw rod units 1, specifically, the connecting barrel 11 is integrally formed on the opposite sides of the fixed ring 5, the connecting barrel 11 includes a cylindrical segment 111 and a hexagonal segment 112 which are integrally formed in sequence, the cylindrical segment 111 and the hexagonal segment 112 of each connecting barrel 11 are sequentially distributed away from the fixed ring 5, the outer diameter of the cylindrical segment 111 is equal to the outer diameter of the rod body part of the screw rod unit 1, the hexagonal segment 112 is used to extend into the rod body of the corresponding screw rod unit 1, and the hexagonal segment 112 of the connecting barrel 11 is fixedly connected with the screw rod unit 1 through a bolt, so as to realize the detachable fixed connection of the fixed ring 5 and the two screw rod units 1.

[0037] With reference to Figure 2 and Figure 5The rotating ring 6 is sleeved on the side of the fixed ring 5 away from the discharge port of the extrusion cylinder, the rotating ring 6 is aligned with the cylindrical segment 111 on the side of the fixed ring 5 close to the feed port, the conical surface 3 is located on the rotating ring 6, the fixed ring 5 is provided with a group of through holes, and the rotating ring 6 is provided with a group of adjusting holes.

[0038] With reference to Figure 5 and Figure 6 Specifically, the group of through holes is provided with two groups, each group of through holes includes two through hole bodies 7 which are symmetrically distributed along the center of the fixed ring 5, the diameter of the through hole body 7 in one group of through holes is greater than that in the other group of through holes, the group of adjusting holes includes two adjusting hole bodies 8 which are symmetrically distributed along the center of the rotating ring 6, and the diameter of the adjusting hole body 8 is equal to the diameter of the through hole body 7 in the group of through holes with the greater diameter.

[0039] When the two adjusting hole bodies 8 on the rotating ring 6 are aligned with the group of through holes with the smaller diameter on the fixed ring 5, the obstruction of the rotating ring 6 to the material conveying is relatively reduced; when the two adjusting hole bodies 8 on the rotating ring 6 are aligned with the group of through holes with the greater diameter on the fixed ring 5, the obstruction of the rotating ring 6 to the material conveying is further reduced, so that the rotating ring 6 can be adjusted to align the adjusting hole body 8 with the through hole body 7 at a required position according to the gelatinization requirement of the material, and the adaptability is further improved; and the smoothness of the material conveying is improved by arranging a group of adjusting holes on the rotating ring 6 and two groups of through holes on the fixed ring 5.

[0040] With reference to Figure 6 and Figure 7 In order to facilitate the rotation of the rotating ring 6, the adjusting part 9 includes a driving motor 91, a driving gear 92 and a transmission tooth segment 93, the driving motor 91 is fixedly installed in the connecting cylinder 11 of the fixed ring 5, the driving gear 92 is coaxially fixed on the output shaft of the driving motor 91, specifically, the driving motor 91 adopts a micro motor, the driving motor 91 is battery type and is wirelessly connected with an external control system, so as to facilitate an operator to control the start of the driving motor 91, and when the fixed ring 5 is installed between the two screw rod units 1, the driving motor 91 will not affect the conveying of the material.

[0041] With reference to Figure 6 and Figure 7The transmission tooth segment 93 is slidingly arranged in the connecting barrel 11 of the fixed ring 5, and specifically, the transmission tooth segment 93 is slidingly arranged on the corresponding cylindrical segment 111 along the circumferential direction of the center of the connecting barrel 11. The transmission tooth segment 93 is in mesh with the driving gear 92. The central angle of the transmission tooth segment 93 is greater than 180 degrees. The transmission tooth segment 93 has a connecting portion 10 which is slidingly arranged in the cylindrical segment 111 on the side of the fixed ring 5 close to the rotating ring 6. The cylindrical segment 111 on the side close to the rotating ring 6 is provided with a sliding hole 13 which is in sliding cooperation with the connecting portion 10. The end portion of the connecting portion 10 outside the cylindrical segment 111 is welded with the rotating ring 6. The inner wall of the rotating ring 6 is in abutment with the outer wall of the corresponding cylindrical segment 111. When the rotating ring 6 is in the initial position, the adjusting hole group is located in the middle of the two groups of material passing hole groups. At this time, the driving gear 92 is located in the middle position of the transmission tooth segment 93. Further, the included angle between the connecting line of the corresponding two material passing hole bodies 7 in one group of material passing hole groups and the connecting line of the corresponding two material passing hole bodies 7 in the other group of material passing hole groups on the side close to the adjusting hole group is less than or equal to 90 degrees. Therefore, the transmission tooth segment 93 only needs to be rotated in a small range each time, so as to switch the rotating ring 6 to different modes.

[0042] With reference to Figure 2 and Figure 6 The inner diameter of the adjusting hole body 8 decreases in the direction close to the fixed ring 5. On the one hand, the material can pass through the adjusting hole body 8 well. On the other hand, when the adjusting hole body 8 is not aligned with any material passing hole body 7, the material in the adjusting hole body 8 can be thrown out during the synchronous rotation of the fixed ring 5 and the rotating ring 6 with the screw unit 1, so that the material does not continuously remain in the adjusting hole body 8. Further, the inner diameter of the material passing hole body 7 decreases in the direction close to the rotating ring 6, which is helpful for the material to pass through the material passing hole body 7 smoothly.

[0043] The implementation principle of the embodiment 2 of the present application is as follows: for the feed with high requirement on gelatinization degree, the rotating ring 6 is kept in the initial position. At this time, the adjusting hole group is located in the middle of the two groups of material passing hole groups, that is, the adjusting hole body 8 is not in communication with any group of material passing hole bodies 7. The resistance of the pressure ring 2 formed by the rotating ring 6 and the fixed ring 5 to the material is the largest. Then, the material is introduced from the feeding port, so as to drive the synchronous rotation of the screw unit 1, the fixed ring 5 and the rotating ring 6. Under the action of the two-stage pressure ring 2, the residence time of the material in the extrusion cylinder of the puffing machine can be significantly prolonged, the gelatinization degree of the feed with high requirement on gelatinization degree is improved, and the quality of the final product is helped to be ensured.

[0044] For the feed with relatively low requirement on gelatinization degree, before work, the external control system is started to drive the driving motor 91, the driving motor 91 drives the rotating ring 6 to rotate, the adjusting hole group on the rotating ring 6 is aligned with the small-diameter material passing hole group on the fixed ring 5, then the material is passed from the feeding port, the screw rod unit 1 drives the fixed ring 5 and the rotating ring 6 to rotate synchronously, at this time, part of the material can be conveyed backward through the adjusting hole group and the material passing hole group, the resistance is reduced to a certain extent, which is helpful to relatively prolong the residence time of the material in the extrusion cylinder of the puffing machine, improve the gelatinization degree of the feed with high requirement on gelatinization degree, and ensure the quality of the final product.

[0045] For the feed with further low requirement on gelatinization degree, before work, the external control system is started to drive the driving motor 91, the driving motor 91 drives the rotating ring 6 to rotate relative to the fixed ring 5, the adjusting hole group on the rotating ring 6 is aligned with the large-diameter material passing hole group on the fixed ring 5, then the material is passed from the feeding port, the screw rod unit 1 drives the fixed ring 5 and the rotating ring 6 to rotate synchronously, at this time, part of the material can be conveyed backward through the adjusting hole group and the material passing hole group, the resistance is further reduced, so that the resistance effect of the pressure ring 2 away from the discharging port can be adjusted according to the requirement of the material, and the applicability is higher. Since the high-pressure effect needs to be formed at the discharging port, therefore, in the embodiment, only the pressure ring 2 away from the discharging port is provided with the adjusting resistance effect.

[0046] The above are the preferred embodiments of the application, which do not limit the protection scope of the application, therefore: any equivalent changes made on the structure, shape and principle of the application should be covered within the protection scope of the application.

Claims

1. A screw structure for an extruder used in feed production, characterized in that, The utility model relates to a kind of extrusion barrel and extrusion barrel screw rod unit, including: Screw rod unit (1), the screw rod unit (1) is provided with multiple, multiple the screw rod unit (1) is sequentially connected, the pitch of the screw rod unit (1) near extrusion barrel discharge port side is less than the pitch of the screw rod unit (1) near extrusion barrel feed port side; Pressure ring (2), the pressure ring (2) is detachably arranged between adjacent screw rod unit (1), the outer wall of the pressure ring (2) is taper face (3), the diameter of the taper face (3) increases towards the direction away from feed port, the taper face (3) of the pressure ring (2) has multiple guide slots (4), multiple the guide slot (4) is spaced distribution along the circumference of corresponding pressure ring (2).

2. A screw structure of an expander for feed production according to claim 1, characterized in that: The guide slot (4) is obliquely arranged, when the screw rod unit (1) rotates and transports feed towards discharge port, the end of the guide slot (4) away from the center of the pressure ring (2) is inclined towards the rotating direction of the screw rod unit (1).

3. The screw structure of an expander for feed production according to claim 1, characterized in that: The screw rod unit (1) is provided with three, the pressure ring (2) is provided with two, the length of the screw rod unit (1) near extrusion barrel discharge port end is less than one third of the length of the screw rod unit (1) near extrusion barrel feed port end.

4. A screw structure of an expander for feed production according to claim 3, characterized in that: The length of the screw rod unit (1) near extrusion barrel feed port end is equal to the sum of the length of the remaining two screw rod units (1).

5. The screw structure of an expander for feed production according to claim 3, wherein: The pressure ring (2) away from extrusion barrel discharge port end includes fixed ring (5) and rotating ring (6), the fixed ring (5) is arranged between corresponding two screw rod units (1), the rotating ring (6) is rotatably arranged on the side of the fixed ring (5) away from extrusion barrel discharge port, the taper face (3) is located on the rotating ring (6), the fixed ring (5) is provided with a group of material holes, the rotating ring (6) is provided with an adjusting hole group, the adjusting hole group is used for aligning or misaligning with the material hole group, the fixed ring (5) is provided with adjusting part (9) for adjusting the rotation of the rotating ring (6).

6. A screw structure of an expander for feed production according to claim 5, characterized in that: The adjusting part (9) includes drive motor (91), drive gear (92) and transmission gear segment (93), the drive motor (91) is arranged in the fixed ring (5), the drive gear (92) is arranged on the output shaft of the drive motor (91), the transmission gear segment (93) is slidably arranged in the fixed ring (5), the transmission gear segment (93) is engaged with the drive gear (92), the transmission gear segment (93) is provided with connecting part (10), and the rotating ring (6) is connected with the connecting part (10) on the transmission gear segment (93).

7. The screw structure of an expander for feed production according to claim 5, wherein: The material hole group is provided with two groups, each of the material hole group includes two material hole bodies (7) symmetrically distributed along the center of the fixed ring (5), the diameter of the material hole body (7) in one group of material hole groups is greater than the diameter of the material hole body (7) in another group of material hole groups, the adjusting hole group includes two adjusting hole bodies (8) symmetrically distributed along the center of the fixed ring (5), and the diameter of the adjusting hole body (8) is equal to the diameter of the material hole body (7) in the group of material holes with larger diameter.

8. A screw structure of an extruder for feed production according to claim 7, characterized in that: The inner diameter of the adjusting hole body (8) decreases towards the direction close to the fixed ring (5), and the inner diameter of the material hole body (7) decreases towards the direction close to the rotating ring (6).

9. The screw structure of an expander for feed production according to claim 1, characterized in that: The outer diameter of the pressure ring (2) is less than the outer diameter of the blade on the screw unit (1).

10. The screw structure of an extruder for feed production according to any one of claims 1 to 9, characterized in that: The pressure ring (2) is provided with a connecting cylinder (11) on opposite sides, the connecting cylinder (11) is used to extend into the corresponding screw unit (1), and the connecting cylinder (11) is used for detachable connection with the corresponding side screw unit (1).

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