Extrusion screw for extruder

Abstract

An extrusion screw for an extruder comprises a rod body and screw flights, the screw flights comprise a feeding section, a mixing section and a discharging section, auxiliary screw flights capable of increasing the material feeding speed are arranged on the rod body between the adjacent screw flights of the feeding section, the rotating direction of the auxiliary screw flights is the same as that of the feeding section, and the auxiliary screw flights are arranged on the rod body. The auxiliary screw flight is provided with a spiral notch capable of increasing the flowing speed of materials in front of and behind the auxiliary screw flight, and the spiral direction of the spiral notch is opposite to the spiral direction of the auxiliary screw flight. The screw has the advantages that the rotating direction of the auxiliary screw flights is the same as that of the feeding section, and the auxiliary screw flights can increase the stirring frequency of materials and push the materials to the discharging section more quickly, so that the feeding speed of the materials can be increased, and the feeding of the screw at the inlet of the feeding section is smooth; the spiral notch accelerates the flowing speed of materials in front of and behind the auxiliary screw flight, so that the materials are promoted to pass through the feeding section more smoothly.

Description

Technical Field

[0001] The utility model relates to the technical field of screw rods, in particular to an extrusion screw rod used in an extruder. Background Art

[0002] There is a Chinese utility model patent with patent number CN202420528301.0 entitled "An Extrusion Screw", which discloses an extrusion screw, including a rod body, a threaded portion at one end of the rod body, a connecting rod at the end of the threaded portion, the rod body including a feeding section, a mixing section and an extrusion section, a first spiral sleeve is provided on the outside of the feeding section, the first spiral sleeve includes a first spiral leaf, a second spiral sleeve is provided on the outside of the mixing section, the second spiral sleeve includes a second spiral leaf, a third spiral sleeve is provided on the outside of the extrusion section, the third spiral sleeve includes a third spiral leaf, a first nut is connected to the outside of the threaded portion, the first nut abuts one end of the first spiral sleeve to limit the movement of the first spiral sleeve, the second spiral sleeve and the third spiral sleeve, and rotating the rod body can synchronously drive the first spiral sleeve, the second spiral sleeve and the third spiral sleeve to rotate. This utility model can greatly facilitate the cleaning of the extrusion screw by providing a detachable feeding section, mixing section and extrusion section. However, the extrusion screw lacks a specific structure to improve the feeding effect, so the structure of the extrusion screw needs further improvement. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide an extrusion screw for an extruder with smooth feeding 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 extrusion screw for the extruder comprises a rod body and screw ribs arranged on the rod body, the screw ribs comprising a feeding section, a mixing section and a discharging section, and is characterized in that auxiliary screw ribs that can accelerate the feeding speed of the material are arranged on the rod body between adjacent screw ribs of the feeding section, the rotation direction of the auxiliary screw ribs is the same as the rotation direction of the feeding section, and a spiral notch that can accelerate the flow speed of the material before and after the auxiliary screw ribs is arranged on the auxiliary screw ribs, and the spiral direction of the spiral notch is opposite to the spiral direction of the auxiliary screw ribs.

[0005] As an improvement, the opening direction of the spiral notch may preferably be perpendicular to the axial direction of the rod body.

[0006] As a further improvement, the auxiliary screw flight may preferably be a double screw flight.

[0007] As a further improvement, the auxiliary screw flight can preferably divide the screw flight spacing at the initial position of the feed section into three equal parts.

[0008] As an improvement, the width of the auxiliary screw flight may preferably be smaller than the width of the screw flight in the feed section.

[0009] As an improvement, the mixing section may preferably include a mixing section one and a mixing section two, both of which are single-screw sections, and a spiral notch is provided on the mixing section two, the spiral direction of the spiral notch being opposite to that of the mixing section two.

[0010] As a further improvement, the opening direction of the spiral notch may preferably be perpendicular to the axial direction of the rod body.

[0011] As a further improvement, the discharge section may preferably be a single screw wing, and the discharge section is connected end to end with the second mixing section.

[0012] As an improvement, the flight pitch of the feed section may preferably be larger than the flight pitch of the mixing section and the discharge section.

[0013] As a further improvement, the screw flight may preferably be a structure with a narrow top and a wide root and a trapezoidal cross section.

[0014] Compared with the prior art, the advantages of the present invention are that: auxiliary spiral fins are provided on the rod body between adjacent spiral fins of the feed section, and the rotation direction of the auxiliary spiral fins is the same as that of the feed section. The auxiliary spiral fins can increase the stirring frequency of the material and push the material to the discharge section faster, thereby speeding up the material feeding speed and making the screw feed smoothly at the inlet position of the feed section; a spiral notch is provided on the auxiliary spiral fin, and the spiral direction of the spiral notch is opposite to the spiral direction of the auxiliary spiral fin. The material entering the rear of the auxiliary spiral fin can enter the front of the auxiliary spiral fin through the spiral notch, thereby speeding up the material flow speed before and after the auxiliary spiral fin, reducing material congestion at the feed section, and promoting the material to pass through the feed section more smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A perspective view of an embodiment of the present utility model;

[0016] Figure 2 for Figure 1 A top view of

[0017] Figure 3 yes Figure 2 Enlarged view of part I;

[0018] Figure 4 yes Figure 3 Sectional view along line AA. DETAILED DESCRIPTION

[0019] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0020] like Figures 1 to 4As shown, the extrusion screw for an extruder of this embodiment includes a rod body 1 and a flight disposed on the rod body 1. The flight is a structure with a narrow top and a wide base, and a trapezoidal cross-section. The flight comprises a feed section A, a mixing section B, and a discharge section C. Auxiliary flights 11 are disposed on the rod body 1 between adjacent flights of the feed section A to accelerate the material feed rate. The direction of rotation of the auxiliary flights 11 is the same as that of the feed section A. Furthermore, the auxiliary flights 11 are provided with spiral notches 111 to accelerate the flow of material before and after the auxiliary flights. The spiral direction of the spiral notches 111 is opposite to that of the auxiliary flights 11. The opening direction of the spiral notches 111 is perpendicular to the axial direction of the rod body. The auxiliary flights 11 are double flights. The auxiliary flights 11 divide the flight spacing at the initial position of the feed section into three equal parts. The width of the auxiliary flights 11 is smaller than the width of the flight 12 of the feed section.

[0021] Mixing section B comprises mixing section B1 and mixing section B2. Both mixing section B1 and mixing section B2 have single flight. Screw notches 121 are provided in mixing section B2, with the spiral direction of notches 121 being opposite to that of mixing section B2. The opening of notches 121 is perpendicular to the axial direction of the rod. Discharge section C has a single flight and is connected end-to-end to mixing section B2. The flight pitch of feed section A is greater than that of mixing section B and discharge section C.

Claims

1. An extrusion screw for an extruder, comprising a rod body (1) and screw flights arranged on the rod body (1), wherein the screw flights include a feeding section (A), a mixing section (B) and a discharging section (C), and characterized in that: An auxiliary screw ridge (11) capable of accelerating the material feeding speed is provided on the rod body (1) between adjacent screw ridges of the feeding section (A); the rotation direction of the auxiliary screw ridge (11) is the same as that of the feeding section (A); and a spiral notch (111) capable of accelerating the material flow speed before and after the auxiliary screw ridge is provided on the auxiliary screw ridge (11); the spiral direction of the spiral notch (111) is opposite to the spiral direction of the auxiliary screw ridge (11).

2. The extrusion screw according to claim 1, characterized in that: The opening direction of the spiral notch (111) is perpendicular to the axial direction of the rod body.

3. The extrusion screw according to claim 2, characterized in that: The auxiliary screw fin (11) is a double screw fin.

4. The extrusion screw according to claim 3, characterized in that: The auxiliary screw flights (11) divide the screw flight spacing at the initial position of the feed section into three equal parts.

5. The extrusion screw according to claim 1, characterized in that: The width of the auxiliary screw flight (11) is smaller than the width of the feed section screw flight (12).

6. The extrusion screw according to any one of claims 1 to 5, characterized in that: The mixing section (B) includes a mixing section (B1) and a mixing section (B2), wherein both the mixing section (B1) and the mixing section (B2) are single-spiral. A spiral notch (121) is provided on the mixing section (B2), and the spiral direction of the spiral notch (121) is opposite to the spiral direction of the mixing section (B2).

7. The extrusion screw according to claim 6, characterized in that: The opening direction of the spiral notch (121) is perpendicular to the axial direction of the rod body.

8. The extrusion screw according to claim 6, characterized in that: The discharging section (C) is a single screw fin, and the discharging section (C) is connected end to end with the second mixing section (B2).

9. The extrusion screw according to any one of claims 1 to 5, characterized in that: The flight pitch of the feeding section (A) is greater than the flight pitch of the mixing section (B) and the discharge section (C).

10. The extrusion screw according to any one of claims 1 to 5, characterized in that: The screw flight is a structure with a narrow top and a wide root and a trapezoidal cross section.

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