Particle crushing mechanism before mixing of color masterbatch

Abstract

The invention discloses a particle crushing mechanism before color masterbatch mixing, belongs to the field of plastic film production, is used for plastic film production, and comprises a supporting frame body rotationally connected with an outer shaft body, and an outer shaft body driving wheel drives a crushing inner barrel to rotate through the outer shaft body; a trumpet-shaped feeding hole is formed in the top end of the crushing outer cylinder, and an outer cylinder bottom hole is formed in the bottom end of the crushing outer cylinder; a gap is reserved between the crushing inner cylinder and the crushing outer cylinder, and inner cylinder outer spiral teeth and inner cylinder screen holes are formed in the outer wall, corresponding to the gap, of the crushing inner cylinder; an inner cylinder bottom hole is formed in the bottom of the crushing inner cylinder; a bottom end gap for arranging a discharging inclined plate is reserved between the crushing inner cylinder and the crushing outer cylinder; the inner shaft body is provided with a plurality of crushing cutter connecting rods connected with the crushing cutters, and the cutting edge parts of the crushing cutters are in contact with the inner wall of the crushing inner cylinder; the inner shaft body penetrates through the outer shaft body and then is connected with the inner shaft body driving wheel. By improving the crushing structure, the transmission form is simplified, the crushing effect and efficiency of plastic particles are improved, and subsequent heating and melting of small plastic particles are facilitated.

Description

Technical Field

[0001] The present application belongs to the field of plastic film production, and more specifically, relates to a particle crushing mechanism for color masterbatch before mixing. Background Art

[0002] Masterbatch refers to a mixture of high-concentration color doped with a large amount of pigments or dyes and configured with resin raw materials. The pigments or dyes are evenly attached to the resin. Generally, during processing, a certain amount of masterbatch and uncolored resin are added and mixed to obtain a colored film product with a designed color concentration. However, after the masterbatch and the uncolored resin are mixed, or before the masterbatch is mixed with the uncolored resin, the degree of fineness (granularity) of the two particles needs to be unified to ensure that the film products produced during the coloring production process have a consistent color distribution and avoid defects caused by unmelted particles. Therefore, it is necessary to crush the masterbatch and uncolored resin particles before melt mixing.

[0003] Referring to a plastic film processing system disclosed in Chinese patent publication number CN110901112A, the plastic film processing system can fully and repeatedly crush plastic particles through a plastic crushing mechanism, crush the plastic particles with originally larger particle sizes into plastic particles with smaller particle sizes through the particle crushing mechanism, and then heat and melt the crushed plastic particles with smaller particle sizes, and continuously stir during the heating and melting process to achieve uniform heating of the smaller plastic particles, which helps to ensure that the molded plastic is not mixed with incompletely melted plastic particles and ensures that the composition of the molded plastic particles is uniform.

[0004] Furthermore, the crushing mechanism disclosed in patent document No. CN110901112A crushes the plastic particles in the crushing barrel by driving the rotation of three crushing knives through a telescopic transmission mechanism. At the same time, the particle crushing mechanism starts to drive the three crushing knives to reciprocate up and down to more fully crush the plastic particles in the crushing barrel, so as to crush the large particles in the crushing barrel into fine particles that fall into an inverted cone-shaped heating bin for heating and melting. The telescopic transmission mechanism heats the plastic particles so that they are heated evenly.

[0005] However, the crushing knife drive form using a reciprocating telescopic structure may result in omissions during the crushing process, and the crushing effect is not ideal; secondly, the transmission form of the reciprocating telescopic structure is relatively complex, and the driving structure and the rotation speed need to be precisely coordinated to achieve the ideal crushing effect, and the complexity is relatively high. Summary of the invention

[0006] The purpose of the present application is to provide a particle crushing mechanism before masterbatch mixing, which can achieve secondary crushing of plastic particles by improving the crushing structure and simplifying the transmission form without adopting a lifting and reciprocating motion structure, so as to improve the crushing effect and efficiency of plastic particles and facilitate the subsequent heating and melting of smaller plastic particles.

[0007] To achieve the above objectives, this application is implemented through the following technical solutions:

[0008] The present application discloses a particle crushing mechanism before masterbatch mixing, comprising a support frame, the support frame is connected to an outer shaft body through a bearing structure, the top of the outer shaft body is fixedly connected to an outer shaft body driving wheel, the bottom end of the outer shaft body is connected to a crushing inner cylinder, the crushing inner cylinder is located inside the crushing outer cylinder and is coaxially arranged with the crushing outer cylinder; the top end of the crushing outer cylinder is a trumpet-shaped feeding port, the bottom end of the crushing outer cylinder has an outer cylinder bottom hole connected to the inside of the crushing outer cylinder; a gap for crushing plastic particles is left between the outer wall of the crushing inner cylinder and the inner wall of the crushing outer cylinder, a plurality of inner cylinder outer spiral teeth are distributed on the outer wall of the crushing inner cylinder corresponding to the gap for crushing plastic particles, and a plurality of inner cylinder outer spiral teeth are distributed on the side wall of the crushing inner cylinder corresponding to the inner cylinder outer spiral teeth The inner cylinder sieve holes are connected with the internal chamber of the crushing inner cylinder; the bottom of the crushing inner cylinder is also provided with an inner cylinder bottom hole, and the inner cylinder bottom hole is connected with the internal chamber of the crushing inner cylinder; a bottom end gap is left between the bottom end of the crushing inner cylinder and the bottom end of the crushing outer cylinder, and a plurality of discharge inclined plates are arranged in the bottom end gap, and the discharge inclined plates are fixedly connected with the inner shaft body; a plurality of radially distributed crushing knife connecting rods are arranged at the position of the inner shaft body located in the internal area of ​​the crushing inner cylinder, and the crushing knife connecting rods are fixedly connected with the crushing knife, and the cutting edge of the crushing knife contacts with the inner wall of the crushing inner cylinder; the inner shaft body extends out after passing through the outer shaft body at the top end of the crushing inner cylinder and is connected with the inner shaft body driving wheel, and a cylinder bearing is arranged at the connection position of the inner shaft body and the outer shaft body.

[0009] As one of the preferred technical solutions of the present application, the inner wall of the trumpet-shaped feed port is provided with a plurality of inner guide ribs, which are fixed as a whole with the trumpet-shaped feed port and extend to the connection position between the trumpet-shaped feed port and the crushing outer cylinder; a plurality of inlet support ribs are distributed at the connection position between the outer wall of the inner guide rib and the crushing outer cylinder, and the bottom end of the inlet support rib is fixedly connected to the annular bottom plate, which is located on the outer wall of the crushing outer cylinder.

[0010] As one of the preferred technical solutions of the present application, the crushing inner cylinder has an inner cylinder conical section, and an inner cylinder bottom hole is distributed at the bottom end of the inner cylinder conical section; the bottom end of the crushing outer cylinder has an outer cylinder conical section, and the outer cylinder bottom hole is located at the bottom end of the outer cylinder conical section; a gap for crushing plastic particles is left between the outer wall of the inner cylinder conical section and the inner wall of the outer cylinder conical section, and a number of secondary crushing teeth are distributed on the outer wall of the inner cylinder conical section.

[0011] As one of the preferred technical solutions of the present application, the secondary crushing teeth are spiral protrusions, and the density of the secondary crushing teeth is greater than the density of the outer spiral teeth of the inner cylinder, and the gap left between the outer end surface of the secondary crushing teeth and the inner wall of the conical section of the outer cylinder is smaller than the gap left between the outer end surface of the outer spiral teeth of the inner cylinder and the inner wall of the crushing outer cylinder.

[0012] As one of the preferred technical solutions of the present application, the grinding inner cylinder is provided with a spiral feeding piece inside the inner cylinder conical section, and the spiral feeding piece is fixed to the position of the inner shaft body located at the inner cylinder conical section and rotates with the rotation of the inner shaft body.

[0013] As one of the preferred technical solutions of the present application, the crushing inner cylinder includes a cylinder section with a hollow cylindrical structure, a plurality of inner cylinder outer spiral teeth are distributed on the outer wall of the cylinder section, and a plurality of inner cylinder sieve holes are distributed on the cylinder section between adjacent inner cylinder outer spiral teeth; the top opening of the cylinder section is blocked by a top frustum section, and the bottom opening of the cylinder section is blocked by an inner cylinder conical section, the inner cylinder conical section has a bottom surface, and an inner cylinder bottom hole is provided on the bottom surface of the inner cylinder conical section; the top end of the top frustum section is fixedly connected to the outer shaft body.

[0014] As one of the preferred technical solutions of the present application, the connection position of the top frustum section and the cylindrical section is flush with the connection position of the trumpet-shaped feed inlet and the crushing outer cylinder.

[0015] Compared with the prior art, the beneficial effects of this application are:

[0016] The present application arranges a relatively moving crushing inner cylinder and a crushing outer cylinder, and in the gap between the crushing inner cylinder and the crushing outer cylinder, inner cylinder outer spiral teeth, inner cylinder sieve holes, secondary crushing teeth and other structures are respectively arranged, which cooperate with the crushing knife in the crushing inner cylinder to achieve the crushing of plastic particles with larger particle sizes, improve the crushing effect of plastic particles, reduce the problems of high precision requirements, complex transmission matching forms, and possible increase in omission rate caused by the reciprocating lifting method, and ensure the subsequent melting operation of plastic particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This application is a three-dimensional Figure 1 .

[0018] Figure 2 This application is a three-dimensional Figure 2 .

[0019] Figure 3 It is a top view of the present application.

[0020] Figure 4 yes Figure 3 Cross-sectional view of the AA portion.

[0021] Figure 5It is a schematic diagram of the structure and relative position of the inner cylinder and the inner shaft in this application.

[0022] Figure 6 yes Figure 5 A partial enlarged view of part I.

[0023] In the figure: 1. Support frame; 2. Trumpet-shaped feed inlet; 3. Inner guide ribs; 4. Inlet support ribs; 5. Annular bottom plate; 6. Crushing outer cylinder; 7. Conical section of outer cylinder; 8. Bottom hole of outer cylinder; 9. Inner shaft driving wheel; 10. Inner shaft; 11. Outer shaft driving wheel; 12. Cylinder bearing; 13. Outer shaft; 14. Crushing inner cylinder; 15. Outer spiral teeth of inner cylinder; 16. Screen holes of inner cylinder; 17. Crushing knife connecting rod; 18. Crushing knife; 19. Spiral feeding piece; 20. Discharge inclined plate; 21. Bottom hole of inner cylinder; 22. Conical section of inner cylinder; 23. Secondary crushing teeth; 24. Cylinder section; 25. Top cone section. DETAILED DESCRIPTION

[0024] The technical solution described in this application is further described below in conjunction with the accompanying drawings. It should be noted that the directional nouns that may be involved in the following paragraphs, including but not limited to "up, down, left, right, front, back", etc., are based on the visual directions shown in the corresponding drawings of the specification, and they should not and should not be regarded as limiting the scope of protection of this technical solution. Their purpose is only to facilitate technicians in this field to better understand the technical solution described in the specification.

[0025] In the description of the following paragraphs, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" and similar expressions should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances combined with the common knowledge, design specifications, standard documents, etc. in this field.

[0026] See also Figures 1 to 6 A particle crushing mechanism before masterbatch mixing comprises a coaxially arranged inner crushing cylinder 14 and an outer crushing cylinder 6, wherein the outer crushing cylinder 6 is a hollow cylinder structure, and an outer crushing cylinder conical section 7 is provided at the bottom of the outer crushing cylinder 6, wherein the bottom end of the outer crushing cylinder conical section 7 is a closed structure and has a bottom surface, and a plurality of outer crushing cylinder bottom holes 8 are processed on the bottom surface of the outer crushing cylinder conical section 7. The top end of the inner crushing cylinder 14 is fixedly connected with a trumpet-shaped feed port 2, and the top end of the trumpet-shaped feed port 2 is open and the inner diameter is larger than the inner diameter at the connection position between the inner crushing cylinder 14 and the outer crushing cylinder 6.

[0027] A plurality of inner guide ribs 3 are evenly distributed around the central axis of the trumpet-shaped feed port 2 on the inner wall thereof, and the inner guide ribs 3 are integrated with the trumpet-shaped feed port 2. An inlet support rib 4 is arranged at the connection position between the trumpet-shaped feed port 2 and the crushing outer cylinder 6, and the inlet support rib 4 is evenly distributed around the central axis of the crushing outer cylinder 6, and the bottom ends of the inlet support ribs 4 are fixed to the annular bottom plate 5, and the annular bottom plate 5 is an annular plate body, and the inner wall of the annular bottom plate 5 is fixedly connected to the outer wall of the crushing outer cylinder 6.

[0028] The pulverizing inner cylinder 14 includes a cylindrical section 24 of a hollow cylindrical structure, and a top frustum section 25 is fixedly connected to the top opening of the cylindrical section 24. The cylindrical section 24 is a frustum-shaped hollow shell, which can achieve the blocking of the top opening of the cylindrical section 24 and can achieve fixed connection with the inner shaft body 10. The inner cylinder conical section 22 is fixedly connected to the bottom opening of the cylindrical section 24, and the blocking of the bottom opening of the cylindrical section 24 is achieved by the inner cylinder conical section 22. The inner cylinder conical section 22 has the same shape and structure as the top frustum section 25, except that a plurality of inner cylinder bottom holes 21 are processed at the bottom end of the inner cylinder conical section 22, and the inner cylinder bottom holes 21 are connected to the closed cavity formed by the inner cylinder conical section 22, the cylindrical section 24, and the top frustum section 25.

[0029] A gap is left between the outer wall of the crushing inner cylinder 14 and the inner wall of the crushing outer cylinder 6 for crushing plastic particles. A plurality of inner cylinder outer spiral teeth 15 are arranged at the gap position corresponding to the gap between the cylindrical section 24 and the crushing outer cylinder 6 for crushing plastic particles. The inner cylinder outer spiral teeth 15 are distributed around the central axis of the crushing inner cylinder 14. A plurality of inner cylinder sieve holes 16 are processed on the cylindrical section 24 between adjacent inner cylinder outer spiral teeth 15. The inner cylinder sieve holes 16 are connected to the internal cavity of the cylindrical section 24.

[0030] A plurality of secondary crushing teeth 23 are arranged at the gap position for crushing plastic particles corresponding to the inner cylinder conical section 22 and the outer cylinder conical section 7. The secondary crushing teeth 23 are spiral protrusions, and the distribution density of the secondary crushing teeth 23 on the inner cylinder conical section 22 is greater than the distribution density of the inner cylinder outer spiral teeth 15 on the cylindrical section 24. The distance between the end surface of the secondary crushing teeth 23 facing the outer cylinder conical section 7 and the inner wall of the outer cylinder conical section 7 is smaller than the distance between the end surface of the inner cylinder outer spiral teeth 15 facing the inner wall of the crushing outer cylinder 6 and the inner wall of the crushing outer cylinder 6, so as to achieve further crushing of the plastic particles at this position.

[0031] A gap is left between the bottom surface of the inner cylinder conical section 22 and the bottom surface of the outer cylinder conical section 7 for the discharge of plastic particles. A plurality of discharge inclined plates 20 are arranged in the gap. The discharge inclined plates 20 are fixed on the inner shaft body 10 and rotate under the rotation of the inner shaft body 10. The bottom end of the inner shaft body 10 is fixed on the bottom surface of the outer cylinder conical section 7 through a bearing seat, and the bearing seat has a sealed bearing structure. The discharge inclined plates 20 are inclined relative to the bottom surface of the outer cylinder conical section 7 and the bottom surface of the inner cylinder conical section 22, and the angle between the two is an acute angle. A cutting edge is processed at the position where the discharge inclined plates 20 contact the bottom surface of the outer cylinder conical section 7. The high-speed rotation of the discharge inclined plates 20 along with the inner shaft body 10 can accelerate the speed of the plastic particles passing through the inner cylinder bottom hole 21 and the inner cylinder conical section 22, thereby improving the discharge efficiency.

[0032] At the same time, in order to assist the work of the discharge inclined plate 20, a spiral feeding piece 19 is also provided in the inner cylinder conical section 22 of the crushing inner cylinder 14. The spiral feeding piece 19 is located on the inner shaft body 10 and rotates at high speed with the inner shaft body 10, which can help the material falling into the inner cylinder conical section 22 to be discharged through the inner cylinder bottom hole 21.

[0033] The inner shaft body 10 is provided with a plurality of radially distributed crushing knife connecting rods 17 at a position above the inner shaft body driving wheel 9 and inside the cylindrical section 24. The crushing knife connecting rods 17 are fixedly connected with crushing knives 18 at the end away from the inner shaft body 10, and the crushing knife connecting rods 17 are evenly distributed in the length direction of the crushing knives 18. The crushing knives 18 have a cutting edge in contact with the inner wall of the crushing inner cylinder 14 (i.e., the inner wall of the cylindrical section 24). When the crushing knives 18 rotate at high speed with the inner shaft body 10, the plastic particles entering the inner cylinder 14 through the inner cylinder sieve holes 16 can be crushed.

[0034] The top end of the inner shaft body 10 passes through the top cone section 25 and enters the interior of the outer shaft body 13, and the inner barrel outer spiral teeth 15 are provided with a cylindrical bearing 12 at the position where the outer shaft body 13 is penetrated, and the cylindrical bearing 12 is located inside the outer shaft body 13. The top end of the outer shaft body 13 is fixedly connected with an outer shaft driving wheel 11. The inner shaft body 10 is fixedly connected with an inner shaft driving wheel 9 at the top end where the inner shaft body 10 penetrates the outer shaft body 13, and the inner shaft driving wheel 9 and the outer shaft driving wheel 11 are connected to an external power mechanism, such as a driving motor, through a transmission belt, so as to drive the above two to rotate in different directions, and then increase the relative motion speed by rotating in opposite directions, thereby improving the crushing effect.

[0035] The outer shaft body 13 is connected to the support frame body 1 through a bearing structure. The support frame body 1 has multiple shafts, which are only schematically shown in the drawings.

[0036] Based on the above embodiments, the following paragraphs will continue to describe in detail the technical features involved and the functions and roles played by the technical features in the present technical solution, so as to help technicians in this field to fully understand the technical solution and reproduce it.

[0037] After entering the trumpet-shaped feed port 2, the plastic particles will roll down along the inner wall of the trumpet-shaped feed port 2 under the action of a number of inner guide ribs 3 to the gap between the crushing outer cylinder 6 and the crushing inner cylinder 14 for crushing plastic particles; the plastic particles entering the above gap will gradually pass through the inner cylinder sieve holes 16 into the inner cavity of the crushing inner cylinder 14 under the action of the inner cylinder outer spiral teeth 15 of the cylindrical section 24, and the crushing inner cylinder 14 and the crushing blade 18 will rotate in the opposite direction to achieve high-speed crushing of the plastic particles. The plastic particles that do not pass through the inner cylinder sieve holes 16 and enter the crushing inner cylinder 14 will also move downward to the gap of the conical section where the inner secondary crushing teeth 23 are located under the action of the inner cylinder outer spiral teeth 15. Since the gap between the secondary crushing teeth 23 and the gap between the inner and outer spiral teeth 15 leaves a smaller plastic crushing distance, the secondary crushing teeth 23 can realize secondary crushing of plastic particles under relative motion, and there are no sieve holes for plastic particles to enter at the inner and outer conical sections 22 and 7, respectively. The crushed plastic particles will enter the discharge inclined plate 20 under the action of the secondary crushing teeth 23, and will be discharged from the bottom hole 8 of the outer cylinder through the discharge inclined plate 20.

[0038] The plastic particles crushed by the crushing knife 18 in the crushing inner cylinder 14 enter the inner cylinder conical section 22, and the crushed plastic particles enter the inner cylinder bottom hole 21 through the spiral feeding piece 19 in the inner cylinder conical section 22. The inner cylinder bottom hole 21 feeds the plastic particles to the discharge inclined plate 20, and the discharge inclined plate 20 discharges the plastic particles through the outer cylinder bottom hole 8.

[0039] Finally, although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A particle crushing mechanism before masterbatch mixing, comprising a support frame (1), the support frame (1) being connected to an outer shaft (13) via a bearing structure, the top end of the outer shaft (13) being fixedly connected to an outer shaft driving wheel (11), characterized in that: The bottom end of the outer shaft (13) is connected to the pulverizing inner cylinder (14), and the pulverizing inner cylinder (14) is located inside the pulverizing outer cylinder (6) and is coaxially arranged with the pulverizing outer cylinder (6); the top end of the pulverizing outer cylinder (6) is a trumpet-shaped feed port (2), and the bottom end of the pulverizing outer cylinder (6) has an outer cylinder bottom hole (8) connected to the inside of the pulverizing outer cylinder (6); a gap for pulverizing plastic particles is left between the outer wall of the pulverizing inner cylinder (14) and the inner wall of the pulverizing outer cylinder (6), and a plurality of inner cylinder outer spiral teeth (15) are distributed on the outer wall of the pulverizing inner cylinder (14) corresponding to the gap for pulverizing plastic particles, and a plurality of inner cylinder sieve holes (16) are distributed on the side wall of the pulverizing inner cylinder (14) corresponding to the inner cylinder outer spiral teeth (15), and the inner cylinder sieve holes (16) are connected to the internal chamber of the pulverizing inner cylinder (14); the bottom of the pulverizing inner cylinder (14) is also provided with an inner cylinder bottom hole (21 ), the bottom hole (21) of the inner cylinder is connected to the internal chamber of the crushing inner cylinder (14); a bottom gap is left between the bottom end of the crushing inner cylinder (14) and the bottom end of the crushing outer cylinder (6), a plurality of discharge inclined plates (20) are arranged in the bottom gap, and the discharge inclined plates (20) are fixedly connected to the inner shaft body (10); a plurality of radially distributed crushing knife connecting rods (17) are arranged at the position of the inner area of ​​the crushing inner cylinder (14), the crushing knife connecting rods (17) are fixedly connected to the crushing knife (18), and the cutting edge of the crushing knife (18) contacts the inner wall of the crushing inner cylinder (14); the inner shaft body (10) passes through the outer shaft body (13) at the top end of the crushing inner cylinder (14) and then extends out and is connected to the inner shaft body driving wheel (9), and a cylinder bearing (12) is arranged at the connection position between the inner shaft body (10) and the outer shaft body (13).

2. The particle crushing mechanism before masterbatch mixing according to claim 1 is characterized in that: The inner wall of the trumpet-shaped feed port (2) is provided with a plurality of inner guide ribs (3), the inner guide ribs (3) and the trumpet-shaped feed port (2) are fixed as a whole and extend to the connection position between the trumpet-shaped feed port (2) and the crushing outer cylinder (6); a plurality of inlet support ribs (4) are distributed at the connection position between the outer wall of the inner guide ribs (3) and the crushing outer cylinder (6), the bottom end of the inlet support rib (4) is fixedly connected to the annular bottom plate (5), and the annular bottom plate (5) is located on the outer wall of the crushing outer cylinder (6).

3. The particle crushing mechanism before masterbatch mixing according to claim 1 is characterized in that: The crushing inner cylinder (14) has an inner cylinder conical section (22), and an inner cylinder bottom hole (21) is distributed at the bottom end of the inner cylinder conical section (22); the crushing outer cylinder (6) has an outer cylinder conical section (7) at the bottom end, and the outer cylinder bottom hole (8) is located at the bottom end of the outer cylinder conical section (7); a gap for crushing plastic particles is left between the outer wall of the inner cylinder conical section (22) and the inner wall of the outer cylinder conical section (7), and a plurality of secondary crushing teeth (23) are distributed on the outer wall of the inner cylinder conical section (22).

4. The particle crushing mechanism before masterbatch mixing according to claim 3 is characterized in that: The secondary crushing teeth (23) are spiral protrusions, and the density of the secondary crushing teeth (23) is greater than the density of the inner cylinder outer spiral teeth (15), and the gap between the outer end surface of the secondary crushing teeth (23) and the inner wall of the outer cylinder conical section (7) is smaller than the gap between the outer end surface of the inner cylinder outer spiral teeth (15) and the inner wall of the crushing outer cylinder (6).

5. The particle crushing mechanism before masterbatch mixing according to claim 3 is characterized by: The crushing inner cylinder (14) is provided with a spiral feeding piece (19) inside the inner cylinder conical section (22); the spiral feeding piece (19) is fixed to the inner shaft body (10) at a position located in the inner cylinder conical section (22) and rotates with the rotation of the inner shaft body (10).

6. A particle crushing mechanism before masterbatch mixing according to any one of claims 1 to 5, characterized in that: The pulverizing inner cylinder (14) comprises a cylinder section (24) of a hollow cylinder structure, a plurality of inner cylinder outer spiral teeth (15) are distributed on the outer wall of the cylinder section (24), and a plurality of inner cylinder sieve holes (16) are distributed on the cylinder section (24) between adjacent inner cylinder outer spiral teeth (15); the top opening of the cylinder section (24) is blocked by a top frustum section (25), and the bottom opening of the cylinder section (24) is blocked by an inner cylinder conical section (22); the inner cylinder conical section (22) has a bottom surface, and the bottom surface of the inner cylinder conical section (22) is provided with an inner cylinder bottom hole (21); the top end of the top frustum section (25) is fixedly connected to the outer shaft body (13).

7. The particle crushing mechanism before masterbatch mixing according to claim 6 is characterized by: The connection position between the top frustum section (25) and the cylindrical section (24) is flush with the connection position between the trumpet-shaped feed inlet (2) and the pulverizing outer cylinder (6).

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