A premixing device for pet additive production

Abstract

The present application relates to powder material mixing device technical field, the present application discloses a kind of premixing device for pet additive production, including shell, drive mechanism, main hollow shaft, floating sleeve, wall scraping stirring frame, torsional spring, internal camshaft and radial block breaking piece.Floating sleeve is rotatably sleeved in main hollow shaft, and is connected with main hollow shaft by torsional spring;Internal camshaft is arranged in main hollow shaft, and is connected with floating sleeve by linkage through circumferential avoiding slot.When wall scraping load makes floating sleeve lag behind rotation relative to main hollow shaft, internal camshaft is relatively rotated and pushes radial block breaking piece to extend into the material area in front of wall scraping stirring frame material side;After load reduction, torsional spring and reset spring drive corresponding component reset.The present application is used for powder or pet additive premixing with a small amount of liquid component.

Description

Technical Field

[0001] This invention relates to the field of powder material mixing equipment, specifically to a premixing device for pet additive production. Background Technology

[0002] Premixed materials for pet additives may include vitamins, amino acids, mineral powders, pharmaceutical excipients, and a small amount of liquid components. The particle size, bulk density, and moisture content of each component differ, and during premixing, some materials may adhere to the inner wall of the mixing chamber, and clumps may also form on the material-facing side of the scraper.

[0003] Existing premixing equipment typically uses a drive shaft to continuously rotate the stirring and scraping components. When the scraping component passes through areas containing agglomerates, the resistance it experiences increases. The continuously penetrating material-breaking component increases motion resistance and wear during normal premixing; configuring separate load detection, control, and a separate agglomeration drive mechanism would increase equipment configuration and maintenance requirements. Powder entering transmission gaps or reciprocating contact areas can also affect the relative motion of the components.

[0004] Therefore, it is necessary to improve the scraping and breaking structure of the premixing device so that local breaking can be triggered when the scraping resistance increases, and the relevant transmission and sliding parts can be adapted to the powder working conditions. Summary of the Invention

[0005] This invention proposes a premixing device for pet additive production, which utilizes the load change of the scraper mixing rack to drive the radial breaking component to extend or retract.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a premixing device for pet additive production, comprising a housing, a drive mechanism, and a main hollow shaft. A premixing chamber is formed inside the housing, and the main hollow shaft is connected to the drive mechanism and extends into the premixing chamber. A floating sleeve capable of relative rotation is fitted around the main hollow shaft, and a wall-scraping agitator is disposed outside the floating sleeve near the inner wall of the premixing chamber. A torsional elastic element connects the main hollow shaft and the floating sleeve. An internal camshaft capable of relative rotation is disposed inside the main hollow shaft, and the internal camshaft is connected to the floating sleeve via a linkage element passing through a circumferential clearance groove on the main hollow shaft. A radially reciprocating piece is disposed on the side wall of the main hollow shaft, and the inner end of the radially reciprocating piece engages with the cam portion of the internal camshaft. The radially reciprocating piece is also connected to a reset elastic element that moves it inward. When the load of the wall-scraping agitator causes the floating sleeve to rotate lagging relative to the main hollow shaft, the floating sleeve drives the internal camshaft to rotate relative to the main hollow shaft via the linkage element, and the cam portion subsequently pushes the radially reciprocating piece outward.

[0007] Furthermore, the floating sleeve is supported outside the main hollow shaft by axially spaced rotating support members and is axially limited relative to the main hollow shaft; the internal camshaft is rotatably and axially limited within the main hollow shaft. The torsional elastic element can be a torque spring, and the linkage element can be a linkage cross pin. The two ends of the circumferential clearance groove constitute the initial limit end and the maximum hysteresis limit end, respectively. The torque spring applies a force to the floating sleeve to move the linkage cross pin toward the initial limit end.

[0008] Furthermore, the cam section of the internal camshaft is an eccentric cam segment, which is sequentially provided with a base circle holding section, a lift section, and a maximum lift section along the relative rotation direction during triggering. When the linkage cross pin is at the initial limit end, the radial breaking component engages with the base circle holding section and is in the retracted position; when the linkage cross pin moves towards the maximum hysteresis limit end, the radial breaking component moves outward along the lift section.

[0009] Furthermore, when the radial breaking component is in the extended position, it is located circumferentially forward on the material-facing side of the scraper agitator, and the radius of gyration of the outer end of the radial breaking component is greater than the radius of gyration of the inner edge of the material-facing side.

[0010] Furthermore, the internal camshaft is provided with multiple eccentric cam segments with the same circumferential phase along the axial direction, and multiple radial breaking pieces are correspondingly provided on the main hollow shaft. The scraper agitator has discharge gaps distributed at intervals along the axial direction, and each radial breaking piece is at the same axial height as a discharge gap.

[0011] Furthermore, a preload adjusting ring capable of circumferential adjustment relative to the main hollow shaft is fitted onto the main hollow shaft, and a locking structure is provided between the preload adjusting ring and the main hollow shaft. One end of the torque spring is connected to the preload adjusting ring, and the other end is connected to the floating sleeve.

[0012] Furthermore, the radial fragmentation component can be a piercing dispersion rod. The floating sleeve has a clearance window penetrating its wall at a position corresponding to the piercing dispersion rod, the clearance window corresponding to the radial movement path of the piercing dispersion rod; the clearance window extends circumferentially along the floating sleeve, its circumferential range covering the circumferential displacement range of the piercing dispersion rod relative to the floating sleeve when the floating sleeve rotates relative to the main hollow shaft from its initial position to its maximum hysteresis position. The piercing dispersion rod passes through the clearance window and moves between a retracted position and an extended position. A wear-resistant guide sleeve is provided on the side wall of the main hollow shaft, and a spring cover is provided at the outer end of the wear-resistant guide sleeve. The piercing dispersion rod has a limiting shoulder located inside the spring cover, and a return spring sleeve is provided outside the piercing dispersion rod and located between the limiting shoulder and the spring cover. An enlarged driven head is provided at the inner end of the piercing dispersion rod, the enlarged driven head cooperating with the inner end of the wear-resistant guide sleeve to form an extension limit, and the limiting shoulder cooperating with the outer end of the wear-resistant guide sleeve to form a retraction limit.

[0013] Furthermore, the driven head can be expanded to include a roller driven head or a sliding driven head with an arc-shaped contact surface. The outer end of the piercing dispersion rod is detachably connected to a barbed tearing head, with the barb tips of the barbed tearing head facing the opposite direction of rotation of the main hollow shaft.

[0014] Furthermore, a sealed transmission cavity is provided above the outer shell, surrounding the main hollow shaft and the upper end of the floating sleeve. A rotary seal is provided between the bottom wall of the sealed transmission cavity and the floating sleeve, and an inter-shaft annular seal is provided between the floating sleeve and the main hollow shaft. The rod segment of the radial fragmenting component extending out of the main hollow shaft is covered with a bellows isolation cover, and the two ends of the bellows isolation cover are respectively sealed to the guide component and the radial fragmenting component.

[0015] With the above structure, the main hollow shaft and the floating sleeve rotate synchronously under normal load. As the resistance to the scraper agitator increases, the floating sleeve rotates with a lag relative to the main hollow shaft. This relative rotation is transmitted to the internal camshaft via the linkage and converted into the extension motion of the radial breaking component. After the material clumps are dislodged or dispersed, and the scraper load decreases, the torsional elastic element and the reset elastic element drive the corresponding components to reset, keeping the radial breaking component retracted during the normal premixing stage. The sealed transmission cavity, the inter-shaft annular seal, and the bellows isolation cover reduce the amount of powder entering the transmission or sliding contact parts. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is an overall cross-sectional view of the present invention; Figure 2 A partial sectional view of the sealed transmission cavity and the transmission part of the floating sleeve; Figure 3 The movable stroke of the linkage pin in the clearance groove; Figure 4 A diagram showing the axial correspondence between multiple radial fragmentation components and the discharge gap of the scraper-mixing frame; Figure 5 This is a partial sectional view of the radial fragmentation component guidance, repositioning, and isolation structure.

[0018] In the diagram: 1. Outer shell; 2. Premixing chamber; 3. Drive motor; 4. Main hollow shaft; 5. Floating sleeve; 6. Scraper agitator; 7. Torque spring; 8. Rotary support; 9. Internal camshaft; 10. Eccentric cam section; 11. Circumferential clearance groove; 12. Linkage pin; 13. Wear-resistant guide sleeve; 14. Puncture dispersion rod; 15. Return spring; 16. Pre-tightening adjustment ring; 17. Locking structure; 18. Spring cover; 19. Limiting shoulder; 20. Enlarged driven head; 21. Barbed tear head; 22. Discharge gap; 23. Sealed transmission chamber; 24. Rotary seal; 25. Inter-shaft annular seal; 26. Bellows isolation cover; 27. Bottom turning plow. Detailed Implementation

[0019] The structure and operation of the present invention will be further described below with reference to the accompanying drawings. The following embodiments are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0020] Please see Figure 1 The premixing device for pet additive production according to this embodiment includes a housing 1, a drive motor 3, a main hollow shaft 4, a floating sleeve 5, a wall-scraping stirring frame 6, an internal camshaft 9, and a piercing dispersing rod 14. A premixing chamber 2 is formed inside the housing 1. The drive motor 3 is disposed above the housing 1, and its output end is connected to the main hollow shaft 4. The main hollow shaft 4 extends along the height direction of the premixing chamber 2. The housing 1 can be provided with corresponding openings according to the requirements of feeding, discharging, and maintenance. The drive mechanism is not limited to the drive motor 3 shown, and other drive forms capable of driving the main hollow shaft 4 to rotate can also be used.

[0021] The floating sleeve 5 is coaxially sleeved outside the main hollow shaft 4, with its upper and lower parts supported on the main hollow shaft 4 by rotating support members 8. The rotating support member 8 can be a wear-resistant support bushing, a sliding bearing, or a sealed bearing. Shoulders, retaining rings, or end caps are provided on both axial sides of the floating sleeve 5 on the main hollow shaft 4 to restrict the axial position of the floating sleeve 5. An annular gap is provided between the inner wall of the floating sleeve 5 and the outer wall of the main hollow shaft 4 to allow relative rotation between the two. The floating sleeve 5 has clearance windows penetrating its wall at axial height and circumferential position corresponding to each puncture dispersion rod 14. The clearance windows correspond to the radial movement path of the puncture dispersion rod 14 and extend circumferentially along the floating sleeve 5; the circumferential range of the clearance windows covers the circumferential displacement range of the puncture dispersion rod 14 relative to the floating sleeve 5 when the floating sleeve 5 rotates relative to the main hollow shaft 4 between the initial position and the maximum hysteresis position.

[0022] The wall-scraping agitator 6 is fixed to the outside of the floating sleeve 5. The wall-scraping agitator 6 includes a vertical frame and scrapers spaced along the vertical frame. The outer edge of the scrapers is close to the inner wall of the premixing chamber 2, and a discharge gap 22 is formed between adjacent scrapers. When the wall-scraping agitator 6 rotates, the scrapers drive the material close to the inner wall of the premixing chamber 2 to move. The scraped material can move towards the center of the premixing chamber 2 through the discharge gap 22.

[0023] Please see Figure 2 and Figure 3 A torque spring 7 is installed between the floating sleeve 5 and the main hollow shaft 4. One end of the torque spring 7 is connected to the floating sleeve 5, and the other end is connected to the preload adjusting ring 16. The preload adjusting ring 16 is sleeved on the main hollow shaft 4 and can rotate relative to the main hollow shaft 4 after the locking structure 17 is released. The locking structure 17 can be a locking screw with an adjusting hole, a clamping ring, or an end face toothed structure. After adjusting the circumferential position of the preload adjusting ring 16, the locking structure 17 fixes the preload adjusting ring 16 to the main hollow shaft 4, thereby changing the initial torsion of the torque spring 7. The preload degree can be determined in combination with the material filling amount, the material flow state, and the normal working load of the scraper agitator 6.

[0024] An internal camshaft 9 is inserted within the main hollow shaft 4. Both ends of the internal camshaft 9 are supported on the main hollow shaft 4 by bearings or support bushings, and axially limited by shoulders, retaining rings, or end face caps, allowing the internal camshaft 9 to rotate relative to the main hollow shaft 4. A circumferential clearance groove 11 extending circumferentially is formed on the upper part of the main hollow shaft 4. A linkage pin 12 passes through the circumferential clearance groove 11, with its inner end connected to the internal camshaft 9 and its outer end connected to the floating sleeve 5. To distribute the load on the linkage pin 12, two or more linkage pins 12 can be spaced apart circumferentially along the main hollow shaft 4, each with a corresponding circumferential clearance groove 11.

[0025] One end of the circumferential clearance groove 11 forms the initial limiting end, and the other end forms the maximum hysteresis limiting end. The torque spring 7 applies a rotational force to the floating sleeve 5 towards its initial position in the assembled state. Under normal load, the linkage pin 12 is located at the initial limiting end, and the main hollow shaft 4 rotates the floating sleeve 5 and the scraper agitator 6 via the torque spring 7. When the scraper agitator 6 encounters lumps on its receiving side, increasing its load, the floating sleeve 5 rotates relative to the main hollow shaft 4 in the hysteresis direction. The linkage pin 12 moves within the circumferential clearance groove 11 towards the maximum hysteresis limiting end, and drives the internal camshaft 9 to rotate relative to the main hollow shaft 4. The circumferential length of the circumferential clearance groove 11 limits the relative angle between the floating sleeve 5 and the main hollow shaft 4. The end of the circumferential clearance groove 11 can be configured as an arc surface adapted to the outer circumference of the linkage pin 12, and a wear-resistant sleeve or buffer sleeve can also be fitted over the linkage pin 12.

[0026] An eccentric cam section 10 is provided on the internal camshaft 9. The eccentric cam section 10 sequentially forms a base circle holding section, a lift section, and a maximum lift section along the relative rotation direction during triggering. When the linkage cross pin 12 is at the initial limit end, the inner end of the puncture dispersion rod 14 engages with the base circle holding section, and the puncture dispersion rod 14 is in the retracted position. When the internal camshaft 9 rotates relative to the main hollow shaft 4, the inner end of the puncture dispersion rod 14 moves along the lift section and gradually extends outward; when the linkage cross pin 12 approaches or reaches the maximum hysteresis limit end, the inner end of the puncture dispersion rod 14 engages with the maximum lift section.

[0027] The rotation direction of the main hollow shaft 4, the lift direction of the eccentric cam section 10, and the material-facing side of the scraper agitator 6 correspond to each other during assembly. When the piercing dispersion rod 14 is in the extended position, its radial axis is located circumferentially forward of the material-facing side of the scraper agitator 6, and its outer end's radius of rotation is greater than the radius of rotation of the inner edge of the material-facing side, allowing the outer end of the piercing dispersion rod 14 to enter the material area in front of the material-facing side of the scraper agitator 6. This positional relationship is determined by the assembly phase fit of the eccentric cam section 10, the circumferential clearance groove 11, and the scraper agitator 6.

[0028] Please see Figure 4 The internal camshaft 9 has multiple eccentric cam segments 10 arranged axially, and the main hollow shaft 4 has multiple piercing and dispersing rods 14 correspondingly arranged. Each eccentric cam segment 10 adopts the same circumferential phase, and each piercing and dispersing rod 14 is located in the same circumferential orientation of the main hollow shaft 4, so that when the internal camshaft 9 rotates relative to the main hollow shaft 4, the multiple piercing and dispersing rods 14 can extend or retract at different axial heights. Each piercing and dispersing rod 14 is at the same axial height as a discharge gap 22, and its extension and retraction trajectory avoids the vertical frame and scraper of the wall-scraping agitator 6.

[0029] Please see Figure 5 A wear-resistant guide sleeve 13 extending radially is fixed to the side wall of the main hollow shaft 4, forming a guide hole for the puncture dispersion rod 14 to slide. The puncture dispersion rod 14 passes through a corresponding clearance window on the floating sleeve 5, and its outer end extends out of the floating sleeve 5 through the clearance window. When the floating sleeve 5 rotates relative to the main hollow shaft 4, the puncture dispersion rod 14 undergoes circumferential displacement relative to the clearance window, and the clearance window provides a clearance range for this displacement circumferentially. When the puncture dispersion rod 14 moves radially under the push of the eccentric cam section 10, it can reciprocate between the retracted position and the extended position through the clearance window. A spring cover 18 is provided at the outer end of the wear-resistant guide sleeve 13, and a limiting shoulder 19 located inside the spring cover 18 is provided on the outer periphery of the puncture dispersion rod 14. A return spring 15 is sleeved on the outside of the puncture dispersion rod 14 and is located between the radially outer side of the limiting shoulder 19 and the outer end wall of the spring cover 18. When the puncture dispersion rod 14 moves outward, it compresses the return spring 15; after the eccentric cam section 10 rotates, the return spring 15 pushes the puncture dispersion rod 14 inward.

[0030] The inner end of the piercing dispersion rod 14 is provided with an enlarged driven head 20, the outer diameter of which is larger than the inner diameter of the guide hole of the wear-resistant guide sleeve 13. When the enlarged driven head 20 abuts against the inner end of the wear-resistant guide sleeve 13, it forms an extension limit; when the limiting shoulder 19 abuts against the outer end of the wear-resistant guide sleeve 13, it forms a retraction limit. The enlarged driven head 20 can be a roller driven head or a sliding driven head with an arc-shaped abutment surface. The former can cooperate with the eccentric cam section 10 in a rolling contact manner, while the latter facilitates reducing the radial installation space.

[0031] The outer end of the piercing and dispersing rod 14 can be detachably connected to the barbed tearing head 21 via a threaded, plug-in, or pin connection. The barbed tips of the barbed tearing head 21 face the opposite direction of rotation of the main hollow shaft 4. After the piercing and dispersing rod 14 extends into the agglomerated material, it continues to rotate with the main hollow shaft 4. The barbed tearing head 21 can produce a prying and hooking effect on the material it contacts; the barbed tearing head 21 can be replaced individually after it wears out.

[0032] A sealed transmission cavity 23 is provided above the outer casing 1, surrounding the upper ends of the main hollow shaft 4 and the floating sleeve 5. The torque spring 7, preload adjusting ring 16, circumferential clearance groove 11, and linkage cross pin 12 are located within the sealed transmission cavity 23. An inspection cover can be installed in the sealed transmission cavity 23. A rotary seal 24 is provided between the bottom wall of the sealed transmission cavity 23 and the outer wall of the floating sleeve 5, and an inter-shaft annular seal 25 is provided between the inner wall of the floating sleeve 5 and the outer wall of the main hollow shaft 4. The rotary seal 24 and the inter-shaft annular seal 25 can be lip seals or sealing rings suitable for relatively rotating parts.

[0033] Both ends of the main hollow shaft 4 are closed. A bellows isolation cover 26 is fitted over the section of each puncture dispersion rod 14 extending out of the main hollow shaft 4. One end of the bellows isolation cover 26 is sealed to the wear-resistant guide sleeve 13 or its outer fixing part, and the other end is sealed to the outer periphery of the puncture dispersion rod 14. When the puncture dispersion rod 14 extends outward or retracts inward, the bellows isolation cover 26 stretches or compresses accordingly. The bellows isolation cover 26 can enclose the spring cover 18, the return spring 15, and the exposed section of the puncture dispersion rod 14.

[0034] A floating sleeve 5 extends from the lower end of the main hollow shaft 4 and connects to a bottom tilting plow 27. The bottom tilting plow 27 rotates synchronously with the main hollow shaft 4, and its outer edge is close to the bottom wall of the premixing chamber 2 and has an inclined working surface, used to drive the material at the bottom of the premixing chamber 2 to move towards the middle or upward. When the floating sleeve 5 rotates lagging behind the main hollow shaft 4, the bottom tilting plow 27 still rotates with the main hollow shaft 4. The bottom tilting plow 27 is an additional component that can be set according to the material deposition situation.

[0035] In use, the pre-tightening adjusting ring 16 is adjusted according to the flow state of the material to be premixed and the normal working load, and fixed by the locking structure 17. After the drive motor 3 starts, the main hollow shaft 4 drives the floating sleeve 5 and the scraper mixing frame 6 to rotate via the torque spring 7. Under normal load, the linkage horizontal pin 12 is located at the initial limit end, and the piercing dispersing rod 14 is in the retracted position. When the scraper mixing frame 6 encounters lumps and the load increases, the floating sleeve 5 rotates with a lag relative to the main hollow shaft 4, and the internal camshaft 9 rotates accordingly, pushing the piercing dispersing rod 14 to extend outward. The piercing dispersing rod 14 enters the material area in front of the material receiving side of the scraper mixing frame 6, piercing, moving, or removing the lumps. After the load decreases, the torque spring 7 drives the floating sleeve 5, the linkage horizontal pin 12, and the internal camshaft 9 to return to the initial position, and the reset spring 15 pushes the piercing dispersing rod 14 to retract.

[0036] During assembly, the initial phase reference can be taken as the state of the linkage pin 12 at the initial limit end, so that the inner end of the piercing dispersion rod 14 corresponds to the base circle holding section of the eccentric cam section 10; then, the lifting direction of the eccentric cam section 10 is determined according to the rotation direction of the main hollow shaft 4 and the position of the scraper agitator 6 on the material receiving side. When the linkage pin 12 is at the maximum hysteresis limit end, the piercing dispersion rod 14 should be axially aligned with the corresponding discharge gap 22 and be able to enter the material area in front of the material receiving side. The torsional elastic element, linkage element, radial breaking element, and reset elastic element can also adopt other structural forms that can form the same motion relationship. The specific dimensions can be determined in combination with the volume of the premixing chamber 2, the material load, and the installation space.

Claims

1. A premixing device for producing pet additives, comprising a housing, a drive mechanism, and a main hollow shaft, wherein a premixing cavity is formed within the housing, and the main hollow shaft is connected to the drive mechanism and extends into the premixing cavity, characterized in that: It also includes a floating sleeve, a wall-scraping agitator, a torsional elastic element, an internal camshaft, and a radial breaking component. The floating sleeve is rotatably fitted around the main hollow shaft. The wall-scraping agitator is disposed outside the floating sleeve and close to the inner wall of the premixing chamber. The torsional elastic element connects the main hollow shaft and the floating sleeve. The internal camshaft is rotatably disposed inside the main hollow shaft and connected to the floating sleeve via a linkage that passes through a circumferential clearance groove on the main hollow shaft. The radial breaking component is disposed on the side wall of the main hollow shaft and can reciprocate radially along the main hollow shaft. The inner end of the radial breaking component engages with the cam portion of the internal camshaft. The radial breaking component is connected to a reset elastic element that moves it toward the inner side of the main hollow shaft. When the load of the wall-scraping agitator causes the floating sleeve to rotate lagging relative to the main hollow shaft, the floating sleeve drives the internal camshaft to rotate relative to the main hollow shaft via the linkage, so that the cam portion pushes the radial breaking component outward.

2. The premixing device for pet additive production according to claim 1, characterized in that, The floating sleeve is supported outside the main hollow shaft by axially spaced rotating support members and is axially limited relative to the main hollow shaft; the internal camshaft is rotatably and axially limited within the main hollow shaft; the torsional elastic member is a torque spring, the linkage member is a linkage cross pin, and the two ends of the circumferential clearance groove respectively form an initial limiting end and a maximum hysteresis limiting end; the torque spring applies a force to the floating sleeve to move the linkage cross pin toward the initial limiting end.

3. The premixing device for pet additive production according to claim 2, characterized in that, The cam section is an eccentric cam segment, which is provided with a base circle holding segment, a lift segment and a maximum lift segment in sequence along the relative rotation direction when triggered; when the linkage cross pin is located at the initial limit end, the radial breaking member cooperates with the base circle holding segment and is in the retracted position; when the linkage cross pin moves towards the maximum hysteresis limit end, the radial breaking member moves outward along the lift segment.

4. The premixing device for pet additive production according to claim 3, characterized in that, When the radial breaking member is in the extended position, it is located circumferentially forward on the material-facing side of the scraper and agitator, and the radius of rotation of the outer end of the radial breaking member is greater than the radius of rotation of the inner edge of the material-facing side.

5. The premixing apparatus for pet additive production according to claim 4, characterized in that, The internal camshaft is provided with multiple eccentric cam segments with the same circumferential phase along the axial direction, and multiple radial breaking pieces are correspondingly provided on the main hollow shaft; the wall scraping and stirring frame has discharge gaps distributed at intervals along the axial direction, and each radial breaking piece is at the same axial height as one of the discharge gaps.

6. The premixing apparatus for pet additive production according to claim 2, characterized in that, A preload adjustment ring capable of circumferential adjustment relative to the main hollow shaft is sleeved on the main hollow shaft, and a locking structure is provided between the preload adjustment ring and the main hollow shaft; one end of the torque spring is connected to the preload adjustment ring, and the other end is connected to the floating sleeve.

7. The premixing apparatus for pet additive production according to claim 3, characterized in that, The radial fragmentation component is a piercing and dispersing rod. The side wall of the main hollow shaft is provided with a wear-resistant guide sleeve for the piercing and dispersing rod to slide. The outer end of the wear-resistant guide sleeve is provided with a spring cover. The piercing and dispersing rod is provided with a limiting shoulder located inside the spring cover. The reset elastic component is a reset spring sleeved on the outside of the piercing and dispersing rod and located between the limiting shoulder and the spring cover. The inner end of the piercing and dispersing rod is provided with an expanding driven head. The expanding driven head cooperates with the inner end of the wear-resistant guide sleeve to form an extension limit. The limiting shoulder cooperates with the outer end of the wear-resistant guide sleeve to form a retraction limit.

8. The premixing apparatus for pet additive production according to claim 7, characterized in that, The enlarged driven head is a roller driven head or a sliding driven head with an arc-shaped contact surface; the outer end of the piercing and dispersing rod is detachably connected to a barbed tearing head, and the barb tip of the barbed tearing head faces the opposite direction of the rotation direction of the main hollow shaft.

9. The premixing apparatus for producing pet additives according to any one of claims 1 to 8, characterized in that, The outer shell is provided with a sealed transmission cavity surrounding the main hollow shaft and the upper end of the floating sleeve. A rotary seal is provided between the bottom wall of the sealed transmission cavity and the floating sleeve. An inter-axial annular seal is provided between the floating sleeve and the main hollow shaft. The radial fragmenting member is covered with a bellows isolation cover on the rod segment extending out of the main hollow shaft. One end of the bellows isolation cover is sealed to a guide member provided on the side wall of the main hollow shaft, and the other end is sealed to the radial fragmenting member.

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