Spiral boosting extrusion screw

Abstract

A spiral boosting extrusion screw comprises a rod body and screw flights arranged on the rod body, shearing concave parts are distributed on the end face of the rod body at intervals, and the bottom faces of the shearing concave parts are gradually lifted to be in smooth transition with the side walls of the screw flights on the end face of the rod body. The shearing concave part and the corresponding screw edge on the end surface of the rod body form a shearing convex angle for extruding and shearing materials, and the bottom surface of the shearing concave part is a step-shaped table surface capable of preventing the materials from being bonded. The material shearing device has the advantages that material shearing can be increased, material uniformity is improved, meanwhile, the stepped table board reduces the area of the end face of the rod body on the same plane, materials are not prone to being attached, material attachment is reduced, and the cleanliness of the end face is high in the working process; pressure can be rapidly gathered and then rapidly released, materials can be separated from the end face of the rod body, and material adhesion is further reduced.

Description

Technical Field

[0001] The invention relates to the technical field of extrusion screws, in particular to a spiral boosting extrusion screw. Background Art

[0002] There is an existing Chinese invention patent application with application number CN201880008653.0 and the name of "High Specific Mechanical Energy Extrusion Screw Assembly" which discloses a high specific mechanical energy extruder screw assembly and a complete extruder, which include a wide thread intermediate screw section, the axial thread width of the wide thread intermediate screw section is greater than the thread width of the inlet and outlet screw sections on the opposite sides of the intermediate section. The intermediate section provides increased friction and shear, which is used to enhance the SME given to the edible food material during the processing of the edible food material. However, the extrusion screw in the extrusion screw assembly cannot solve the problem of screw end sticking, and there is room for improvement, so the structure of the extrusion screw needs to be further improved. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a spiral boost extrusion screw with high end face cleanliness during operation and capable of effectively avoiding material adhesion in view of the above-mentioned existing technical status.

[0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: the spiral boost extrusion screw comprises a rod body and a screw edge arranged on the rod body, and is characterized in that shearing recesses are spaced apart on the end face of the rod body, the bottom surface of the shearing recesses is gradually raised and smoothly transitions with the side wall of the screw edge of the corresponding end face of the rod body, the shearing recesses and the screw edge of the corresponding end face of the rod body form a shearing convex angle for extruding and shearing materials, and the bottom surface of the shearing recesses is a stepped table surface that can prevent material adhesion.

[0005] As an improvement, each step of the stepped table top can be preferably inclined and smoothly transitioned. The material pressurization transition is smooth, thereby improving the material processing effect.

[0006] As a further improvement, the bottom surface of each step can preferably be an arc surface with the middle portion bent inwards, thereby increasing the material carrying capacity of each step, releasing the material squeezing force more quickly, and helping the material to separate from the end surface of the rod body.

[0007] As an improvement, there may preferably be two shearing recesses, which are evenly spaced and distributed on the end surface of the rod body.

[0008] As a further improvement, the shearing recess and the shearing convex corner may preferably be smoothly connected into a whole via an arc surface.

[0009] As a further improvement, the arcuate surface may preferably be an arcuate concave surface having a larger width close to the outer wall of the rod body and a smaller width close to the central axis of the rod body.

[0010] As an improvement, the screw flight may preferably be a double screw flight.

[0011] As an improvement, the end of the rod body may preferably be provided with a connecting head that can be fixed to the screw drive mechanism.

[0012] As a further improvement, the connector may preferably be a columnar structure, and a limiting groove capable of inserting a limiting key is provided on a side wall of the columnar structure.

[0013] As a further improvement, positioning recessed holes for facilitating positioning of the rod body may be preferably symmetrically provided at the end of the connector and the other end of the rod body, and the bottom surface of the positioning recessed holes is a conical surface.

[0014] Compared with the prior art, the advantages of the present invention are: shearing recesses are distributed at intervals on the end face of the rod body, and the shearing recesses and the corresponding screw edges of the end face of the rod body form shearing convex angles for extruding and shearing materials. The bottom surface of the shearing recess is a stepped table surface that can prevent material adhesion. This structure can increase the shearing of materials and improve the uniformity of materials. At the same time, the stepped table surface reduces the area of ​​the end face of the rod body on the same plane, and the material is not easy to adhere, thereby reducing material adhesion and improving the cleanliness of the end face during operation; the bottom surface of the shearing recess is gradually raised and smoothly transitions to the side wall of the screw edge of the corresponding end face of the rod body. This structure can quickly accumulate pressure and then quickly release it, which helps the material to separate from the end face of the rod body and further reduces material adhesion. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A three-dimensional diagram of an embodiment of the present invention;

[0016] Figure 2 for Figure 1 A stereogram at another angle;

[0017] Figure 3 yes Figure 1 A top view of

[0018] Figure 4 yes Figure 3 Sectional view along line AA;

[0019] Figure 5 yes Figure 1 Side projection of

[0020] Figure 6 yes Figure 2 A magnified view of part I;

[0021] Figure 7 yes Figure 4Enlarged view of part II. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below with reference to the accompanying drawings.

[0023] like Figures 1 to 7 As shown, the spiral boost extrusion screw of this embodiment includes a rod body 1 and a screw rib 2 arranged on the rod body 1. Shearing recesses 11 are distributed at intervals on the end face of the rod body 1. The bottom surface of the shearing recess 11 is gradually raised and smoothly transitions with the side wall of the screw rib 2 of the corresponding rod body end face. The shearing recess 11 and the screw rib 2 of the corresponding rod body end face form a shearing convex angle 12 for extruding and shearing materials. The bottom surface of the shearing recess 11 is a stepped table 13 that can prevent the material from sticking. Each step of the stepped table 13 is inclined and smoothly transitioned. The bottom surface of each step is an arc surface 131 with the middle part bent inward. There are two shearing recesses 11, and the two shearing recesses 11 are distributed at equal intervals on the end face of the rod body. The shearing recess 11 and the shearing convex angle 12 are smoothly connected to form a whole through an arc surface. The arc surface is an arc surface concave surface with a large width close to the outer wall of the rod body and a small width close to the central axis of the rod body.

[0024] The screw 2 is a double screw. The end of the rod body 1 is provided with a connector 3 that can be fixed to the screw drive mechanism. The connector 3 is a columnar structure, and a limit groove 31 that can be inserted with a limit key is provided on the side wall of the columnar structure. A positioning concave hole 32 for convenient positioning of the rod body 1 is symmetrically provided at the end of the connector 3 and the other end of the rod body 1, and the bottom surface of the positioning concave hole is a conical surface.

Claims

1. A spiral boost extrusion screw, comprising a rod body (1) and a screw flight (2) arranged on the rod body (1), characterized in that: Shearing recesses (11) are spaced apart on the end surface of the rod body (1), the bottom surface of the shearing recesses (11) gradually rises and smoothly transitions with the side wall of the screw ridge (2) on the corresponding end surface of the rod body, the shearing recesses (11) and the screw ridge (2) on the corresponding end surface of the rod body form a shearing convex angle (12) for extruding and shearing materials, and the bottom surface of the shearing recesses (11) is a stepped table surface (13) capable of preventing materials from sticking.

2. The spiral boost extrusion screw according to claim 1, characterized in that: Each step of the stepped table top (13) is inclined and smoothly transitioned.

3. The spiral boost extrusion screw according to claim 2, characterized in that: The bottom surface of each step is an arc surface (131) with the middle portion bending inwards.

4. The spiral boost extrusion screw according to any one of claims 1 to 3, characterized in that: There are two shearing recesses (11), which are evenly spaced and distributed on the end surface of the rod body.

5. The spiral boost extrusion screw according to claim 4, characterized in that: The shearing recess (11) and the shearing convex corner (12) are smoothly connected to form a whole through an arc surface.

6. The spiral boost extrusion screw according to claim 5, characterized in that: The arc surface is a concave arc surface with a larger width close to the outer wall of the rod body and a smaller width close to the central axis of the rod body.

7. The spiral boost extrusion screw according to any one of claims 1 to 3, characterized in that: The screw fin (2) is a double screw fin.

8. The spiral boost extrusion screw according to any one of claims 1 to 3, characterized in that: The end of the rod body (1) is provided with a connecting head (3) which can be fixed to a screw drive mechanism.

9. The spiral boost extrusion screw according to claim 8, characterized in that: The connector (3) is a columnar structure, and a limiting groove (31) capable of inserting a limiting key is provided on the side wall of the columnar structure.

10. The spiral boost extrusion screw according to claim 9, characterized in that: Positioning recessed holes (32) for conveniently positioning the rod body (1) are symmetrically arranged at the end of the connector (3) and the other end of the rod body (1); the bottom surface of the positioning recessed holes is a conical surface.

Images