Rubber extrusion screw

Abstract

A rubber extrusion screw comprises a rod body and a screw flight arranged on the rod body, the screw flight comprises a feeding section, a melting section and a discharging section, the feeding section comprises a first feeding section and a second feeding section, and the first feeding section and the second feeding section are smoothly connected end to end. A forced conveying structure capable of increasing the material bearing capacity and increasing material shearing is arranged on the rod body corresponding to the first feeding section, the forced conveying structure is connected with the side wall of the first feeding section, the forced conveying structure comprises a spiral groove, and the spiral direction of the spiral groove is the same as that of the spiral flight. The forced conveying structure has the advantages that the forced conveying structure can increase the material bearing capacity and increase material shearing, so that materials are better pushed to enter the first feeding section, and the problem that in the prior art, the material shearing effect at the feeding position is not ideal enough is solved. Under the condition of the same unit volume, the forced conveying structure can increase the pressure change received by the materials, increase the axial and axial flow of the materials, and further promote the shearing treatment of the materials.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of injection molding machine extrusion screw technical field, especially refer to a kind of rubber extrusion screw. BACKGROUND

[0002] A kind of extrusion screw with the patent number CN202121066028.7 and the name of the Chinese utility model patent is disclosed, which includes a rod body and a screw rib arranged on the rod body, the screw rib is divided into a feeding section, a melting section and a discharge section, the feeding section screw rib is double screw rib, the feeding section screw rib includes first screw rib and second screw rib arranged at intervals, the axial section of the second screw rib is a triangular structure capable of cutting materials to improve the material flow effect, the melting section screw rib is composed of N sections of screw rib strips arranged at intervals. The utility model has the advantages that: when processing materials with poor fluidity such as rubber, the material can still be effectively cut, the material is pushed to flow forward, the material feeding becomes smooth, and the material is effectively prevented from being blocked in the feeding section;The screw rib strips arranged at intervals increase the residence time of the material in the melting section, fully extrude the bubbles, and increase the pushing effect of the screw rib end face on the material entering the melting section, change the flow track of the material, realize multi-directional stirring and multiple stirring of the material, and further improve the extrusion effect. However, the extrusion screw still has room for improvement in terms of material shearing effect at the feeding position, and the feeding position of the existing structure is not ideal for conveying materials such as rubber with high viscosity, so the structure of the extrusion screw needs to be further improved. SUMMARY

[0003] The utility model solves the technical problem to provide a kind of rubber extrusion screw with simple structure, can forcibly transport large viscous material, feeding is smooth, and shearing effect is good.

[0004] The technical scheme adopted by the utility model to solve the above technical problems is as follows: the rubber extrusion screw includes a rod body and a screw rib arranged on the rod body, the screw rib includes a feeding section, a melting section and a discharge section, characterized in that: the feeding section includes a first feeding section and a second feeding section, the first feeding section and the second feeding section are smoothly connected end to end, and a forced conveying structure capable of increasing the material carrying capacity and increasing the material shearing is arranged on the rod body corresponding to the first feeding section, the forced conveying structure is connected with the side wall of the first feeding section, and the forced conveying structure includes a spiral groove, the spiral groove has the same spiral direction as the screw rib.

[0005] As an improvement, the specific structure of the forced conveying structure can preferably be that the side wall of the feeding first section is provided with helical auxiliary flight, the auxiliary flight covers the surface of the rod body between the feeding first sections, the auxiliary flight is provided with helical groove, and the flight pitch of the helical groove is smaller than that of the feeding first section. The helical groove is provided on the auxiliary flight, the pressure change received by the material is increased under the condition of the same unit volume, the axial and radial flow of the material is increased, and the shearing treatment of the material is further promoted.

[0006] Further improvement, the distance between the starting position of the helical groove and the starting position of the feeding first section can preferably be 8-25 cm. The processing of the helical groove is facilitated.

[0007] Further improvement, the starting position of the helical groove can preferably destroy the feeding first section at the corresponding position, so that the protruding flight at the position becomes a groove lower than the surface of the rod body. The change of the flight profile is further increased, the flow direction of the material at the feeding position is changed, and the shearing treatment effect of the material is promoted.

[0008] Further improvement, the feeding first section can preferably be four flights. This structure can increase the forward pushing effect of the material.

[0009] As an improvement, the feeding second section can preferably be double flight.

[0010] As an improvement, the rod body corresponding to the melting section can preferably be a conical cylinder with gradually decreasing diameter.

[0011] As an improvement, the flight of the melting section can preferably be provided with flight gaps at intervals, which can be passed through by the stirring pin connected to the corresponding barrel, and the opening direction of the flight gap is parallel to the rotation direction of the flight.

[0012] As an improvement, the discharging section can preferably be double flight.

[0013] As an improvement, a cooling liquid through hole penetrating through the rod body can be provided in the middle part of the rod body. The overheating of the rod body and the material can be avoided through heat conduction, the service life of the rod body is prolonged, and the material processing effect is improved.

[0014] Compared with the prior art, the advantages of the utility model lie in that the feeding first section and the feeding second section are smoothly connected at the tail, the forced conveying structure is arranged on the rod body corresponding to the feeding first section, the forced conveying structure is connected with the side wall of the feeding first section, the forced conveying structure comprises a helical groove, the helical direction of the helical groove is the same as that of the flight, the forced conveying structure can increase the material carrying capacity and the material shearing, so as to better push the material into the feeding first section and improve the problem that the shearing effect of the material at the feeding position in the prior art is not ideal. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1is a front projection view of the utility model embodiment;

[0016] Figure 2 is Figure 1 a front projection view of the utility model embodiment;

[0017] Figure 3 is Figure 2 a sectional view along line A-A in the utility model embodiment;

[0018] Figure 4 is Figure 1 an enlarged view of I part in the utility model embodiment;

[0019] Figure 5 is Figure 1 an enlarged view of II part in the utility model embodiment. DETAILED DESCRIPTION

[0020] The utility model will be described further in detail below in combination with the drawings.

[0021] As Figures 1 to 5 shown, the rubber extrusion screw of the embodiment includes a rod body 1 and screw ribs arranged on the rod body 1, the screw ribs include a feeding section A, a melting section B and a discharging section C, the feeding section A includes a feeding first section A1 and a feeding second section A2, the feeding first section A1 and the feeding second section A2 are smoothly connected at the head and tail, a forced conveying structure 11 capable of increasing material carrying capacity and increasing material shearing is arranged on the rod body 1 corresponding to the feeding first section A1, the forced conveying structure 11 is connected with the side wall of the feeding first section A1, the forced conveying structure 11 includes a spiral groove 111, the spiral groove 111 is the same as the spiral direction of the screw rib.

[0022] The specific structure of the forced conveying structure 11 is that the auxiliary screw rib 112 in spiral shape is arranged on the side wall of the feeding first section A1, the auxiliary screw rib 112 covers the rod body surface between the feeding first section A1, the spiral groove 111 is arranged on the auxiliary screw rib 112, the screw rib spacing of the spiral groove 111 is smaller than the screw rib spacing of the feeding first section A1. The distance between the starting position of the spiral groove 111 and the starting position of the feeding first section A1 is 8-25cm. The starting position of the spiral groove 111 destroys the feeding first section A1 at the corresponding position, so that the screw rib protrusion at the position becomes a groove lower than the rod body surface.

[0023] The feeding first section A1 is four screw ribs. The feeding second section A2 is double screw ribs. The rod body 1 corresponding to the melting section is a tapered cylinder with gradually decreasing diameter. The screw ribs of the melting section B are provided with screw rib gaps 12 capable of allowing stirring pins connected to the corresponding cylinder to pass through at intervals, the opening direction of the screw rib gap 12 is parallel to the screw rotation direction. The discharging section C is double screw ribs. The cooling liquid through hole 13 penetrating through the rod body 1 is arranged in the middle part of the rod body 1.

Claims

1. A rubber extrusion screw comprising a barrel (1) and screw flights provided on the barrel (1), the screw flights comprising a feed section (A), a melting section (B) and a discharge section (C), characterized in that: The feeding section (A) comprises a feeding first section (A1) and a feeding second section (A2), the feeding first section (A1) and the feeding second section (A2) are smoothly connected in sequence, the feeding first section (A1) is provided with a forced conveying structure (11) capable of increasing the material carrying capacity and the material shearing, the forced conveying structure (11) is connected with the side wall of the feeding first section (A1), the forced conveying structure (11) comprises a spiral groove (111), and the spiral groove (111) has the same spiral direction as the spiral rib.

2. Rubber extrusion screw according to claim 1, characterized in that: The forced conveying structure (11) comprises a spiral groove (111), and the spiral groove (111) has the same spiral direction as the spiral rib.

3. Rubber extrusion screw according to claim 2, characterized in that: The distance between the starting position of the spiral groove (111) and the starting position of the feeding first section (A1) is 8-25 cm.

4. The rubber extrusion screw of claim 3, wherein: The starting position of the spiral groove (111) destroys the feeding first section (A1) at the corresponding position, so that the rib protrusion at the position becomes a groove lower than the surface of the rod body.

5. The rubber extrusion screw of claim 4, wherein: The feeding first section (A1) is a four-rib.

6. Rubber extrusion screw according to any one of claims 1 to 5, characterized in that: The feeding second section (A2) is a double-rib.

7. Rubber extrusion screw according to any one of claims 1 to 5, characterized in that: The corresponding rod body (1) of the melting section is a tapered cylinder with gradually decreasing diameter.

8. Rubber extrusion screw according to any one of claims 1 to 5, characterized in that: The rib of the melting section (B) is provided with a rib gap (12) capable of allowing the stirring pin connected to the corresponding barrel to pass through, and the opening direction of the rib gap (12) is parallel to the rotation direction of the rib.

9. Rubber extrusion screw according to any one of claims 1 to 5, characterized in that: The discharging section (C) is a double-rib.

10. Rubber extrusion screw according to any one of claims 1 to 5, characterized in that: A cooling liquid through hole (13) is arranged in the middle of the rod body (1) and penetrates the rod body (1).

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