Extrusion screw

Abstract

The extrusion screw rod comprises a rod body and screw flights arranged on the rod body, each screw flights comprises 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. And a notch part capable of increasing the material bearing volume is arranged on the auxiliary screw flight. Compared with the prior art, the screw rod has the advantages that the auxiliary screw flights 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 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 stirring efficiency is improved. The feeding of the screw rod at the inlet position of the feeding section is smooth; and the notch parts are arranged on the auxiliary screw flights and can increase the material bearing volume, so that the inner cavity of the machine barrel corresponding to the feeding section is not blocked after the feeding is accelerated, the normal operation of the extruder is realized, and the normal work of the extrusion screw rod is favorably realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of screw technology field, especially refer to a kind of extrusion screw that feeding is smooth. BACKGROUND

[0002] The utility model discloses a kind of extrusion screw, including stem, stem one end is equipped with threaded portion, threaded portion end is equipped with connecting rod, stem includes feeding section, mixing section and extrusion section, feeding section outside is equipped with first spiral cover, first spiral cover includes first spiral blade, mixing section outside is equipped with second spiral cover, second spiral cover includes second spiral blade, extrusion section outside is equipped with third spiral cover, third spiral cover includes third spiral blade, threaded portion outside is connected with first nut by thread, first nut abuts first spiral cover one end, to limit first spiral cover, second spiral cover and third spiral cover activity, stem is rotated, it can synchronously drive first spiral cover, second spiral cover and third spiral cover rotation. The utility model discloses by setting detachable feeding section, mixing section and extrusion section, can greatly facilitate the cleaning of extrusion screw. However, the extrusion screw lacks the specific structure for improving feeding effect, so the structure of the extrusion screw still needs to be further improved. SUMMARY

[0003] The utility model provides a kind of extrusion screw that feeding is smooth to the technical problem to be solved by the utility model is in view of the above prior art status.

[0004] The technical scheme for solving the above technical problem adopted by the utility model is as follows: the extrusion screw, including stem and the screw rib being set on stem, the screw rib includes feeding section, mixing section and extrusion section, characterized by: the stem between the adjacent screw rib of feeding section is provided with the auxiliary screw rib that can accelerate the feeding speed of material, the rotation direction of the auxiliary screw rib is same with the rotation direction of feeding section, and, the auxiliary screw rib is provided with the notch portion that can increase the material carrying volume.

[0005] As improvement, the width of the auxiliary screw rib can be preferably less than the width of the feeding section screw rib.

[0006] Further improvement, the auxiliary screw rib can be preferably double screw rib.

[0007] Further improvement, the auxiliary screw rib can preferably trisect the screw rib spacing of the initial position of feeding section.

[0008] Further improvement, the axial section height of the auxiliary screw rib can be preferably slightly less than or equal to the axial section height of the feeding section screw rib.

[0009] As improvement, the auxiliary screw rib can be preferably the structure that root is thick and top is thin and section is trapezoidal.

[0010] As an improvement, check grooves can preferably be spaced out on the rod near the feed end of the rod.

[0011] As an improvement, the mixing section may preferably include a first mixing section and a second mixing section, wherein the first mixing section is a single-threaded section and the second mixing section is a double-threaded section with gradually decreasing thread spacing.

[0012] As an improvement, the extrusion section can preferably be a double-screw section, and a blank section without screws is provided between the extrusion section and the mixing section.

[0013] As an improvement, the spiral ridge can preferably be a structure with a narrow top, a thick root, and a trapezoidal cross-section.

[0014] Compared with the prior art, the advantages of this utility model are as follows: auxiliary screw ribs are provided on the rod between adjacent screw ribs in the feeding section. The rotation direction of the auxiliary screw ribs is the same as that of the feeding section. The auxiliary screw ribs can increase the stirring frequency of the material and push the material to the discharge section more quickly, thereby accelerating the material feeding speed and ensuring smooth feeding of the screw at the inlet position of the feeding section. The auxiliary screw ribs are provided with notches, which can increase the material carrying volume and prevent blockage of the barrel cavity corresponding to the feeding section after the feeding speed is increased, so as to realize the normal operation of the extruder and help to realize the normal operation of the extrusion screw. Attached Figure Description

[0015] Figure 1 This is a perspective view of an embodiment of the present utility model;

[0016] Figure 2 for Figure 1 Top view;

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

[0018] Figure 4 yes Figure 3 Cross-sectional view along line AA. Detailed Implementation

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

[0020] like Figures 1 to 4 As shown, the extrusion screw of this embodiment includes a rod body 1 and screw ribs disposed on the rod body 1. The screw ribs have a narrow top, a thicker root, and a trapezoidal cross-section. The screw ribs include a feeding section A, a mixing section B, and an extrusion section C. An auxiliary screw rib 11 is disposed on the rod body 1 between adjacent screw ribs in the feeding section A to accelerate the material feeding speed. The rotation direction of the auxiliary screw rib 11 is the same as that of the feeding section A, and a notch 111 is disposed on the auxiliary screw rib 11 to increase the material carrying volume.

[0021] The width of the auxiliary screw flight 11 is less than that of the feed section screw flight 12. The auxiliary screw flight 11 is a double flight. The auxiliary screw flight 11 equally divides the screw flight spacing at the initial position of the feed section. The axial cross-sectional height of the auxiliary screw flight 11 is slightly less than or equal to the axial cross-sectional height of the feed section screw flight 12. The auxiliary screw flight 11 is a structure with a thick root and a thin top, and a trapezoidal cross-section.

[0022] The non-return groove 13 is spacedly distributed on the rod body near the feed end of the rod body. The mixing section B includes a mixing first section B1 and a mixing second section B2. The mixing first section B1 is a single flight, and the mixing second section B2 is a double flight with gradually decreasing screw flight spacing. The extrusion section C is a double flight, and a blank section K without screw flight is arranged between the extrusion section C and the mixing section B.

Claims

1. An extrusion screw comprising a barrel (1) and screw flights provided on the barrel (1), the screw flights comprising a feed section (A), a mixing section (B) and an extrusion section (C), characterized in that: The auxiliary screw (11) is arranged on the shaft (1) between the adjacent screw flights of the feeding section (A) to accelerate the feeding speed of the material, the auxiliary screw (11) has the same rotation direction as the feeding section (A), and the auxiliary screw (11) is provided with a notch part (111) to increase the material carrying volume.

2. The extrusion screw of claim 1, wherein: The width of the auxiliary screw (11) is less than the width of the feeding section screw (12).

3. The extrusion screw of claim 2, wherein: The auxiliary screw (11) is a double screw.

4. The extrusion screw of claim 3, wherein: The auxiliary screw (11) divides the screw flight spacing of the initial position of the feeding section into three equal parts.

5. The extrusion screw of claim 4, wherein: The axial cross-sectional height of the auxiliary screw (11) is slightly less than or equal to the axial cross-sectional height of the feeding section screw (12).

6. The extrusion screw of any one of claims 1 to 5, wherein: The auxiliary screw (11) is a structure with a thick root and a thin top, and the cross section is trapezoidal.

7. The extrusion screw of any one of claims 1 to 5, wherein: The non-return groove (13) is arranged on the shaft in a spaced manner close to the feeding end of the shaft.

8. The extrusion screw of any one of claims 1 to 5, wherein: The mixing section (B) includes a mixing section (B1) and a mixing section (B2), the mixing section (B1) is a single screw, and the mixing section (B2) is a double screw with gradually decreasing screw flight spacing.

9. The extrusion screw of any one of claims 1 to 5, wherein: The extrusion section (C) is a double screw, and a blank section (K) without screw is arranged between the extrusion section (C) and the mixing section (B).

10. The extrusion screw of any one of claims 1 to 5, wherein: The screw is a structure with a narrow top and a thick root, and the cross section is trapezoidal.

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