Durable protective extrusion screw with gradually-changed lead angle

Abstract

The utility model discloses a durable protection type lead angle gradient extrusion screw which comprises a first screw body, a first transition section, a second transition section, a third transition section, a fourth transition section, a third screw body, a first screw head, a second screw head, a first thread, a second screw body, a second thread, a first stirring column, a second stirring column, a fourth screw body and a fourth thread, a first stirring column and a second stirring column are arranged on the third screw body, the first stirring column and the second stirring column are uniformly coiled outside the third screw body, and fourth transition sections are arranged at the upper end and the lower end of the third screw body; according to the variable-diameter screw rod, the diameter of the third screw rod body is smaller than that of the second screw rod body, the diameter of the second screw rod body is smaller than that of the fourth screw rod body, and the diameter of the second screw rod body is smaller than that of the first screw rod body, so that reducing of the whole screw rod body is achieved.

Description

Technical Field

[0001] The utility model relates to the field of screw processing, in particular to a durable protective type extrusion screw with a gradually changing thread lead angle. Background Art

[0002] The outer surface of the screw is a cylinder with spiral grooves or a cone with conical spiral grooves. The screw is an important accessory for plastic processing. The general structure is a cylindrical screw with spiral threads from top to bottom, or surrounded by spiral ridges of other structures from top to bottom. Generally, the outer diameter of the main cylindrical screw of this extruder screw is fixed, resulting in the distance between the thread and the stud being too short, and the rubber cannot be cut and mixed deeply, affecting the quality of the extruded product. In order to solve the above difficulties, it is necessary to develop a durable protective extrusion screw with a gradual thread rise angle that can improve mixing efficiency, with different stud structures on the top and bottom of the screw. Utility Model Content

[0003] The utility model aims to solve the shortcomings in the prior art and proposes a durable protective type extrusion screw with a gradually variable thread lead angle.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A durable protective extrusion screw with a gradual change in thread lead angle comprises a first screw body, a first transition section, a second transition section, a third transition section, a fourth transition section, a third screw body, a first screw head, a second screw head, a first thread, a second screw body, a second thread, a first stirring column, a second stirring column, a fourth screw body and a fourth thread, wherein the third screw body is provided with a first stirring column and a second stirring column, the first stirring column and the second stirring column are evenly spiraled outside the third screw body, the third screw body is provided with a fourth transition section at both upper and lower ends, the fourth transition section is provided with a third transition section, the third transition section is provided with a second screw body, the second screw body spirals with a second thread from top to bottom, the other end of the second screw body is provided with a second transition section, the other end of the second transition section is provided with a first transition section, the first transition section above is provided with a first screw body, the first screw body spirals with a first thread from top to bottom, the first screw body is provided with a second screw head, the second screw head is provided with a first screw head, the first transition section below is provided with a fourth screw body, and the fourth screw body spirals with a fourth thread from top to bottom.

[0006] The lead angle of the fourth thread is the same as that of the first thread, which is 30°.

[0007] The lead angle of the second thread is 15°.

[0008] The second stirring column is located in the middle of the two groups of first stirring columns, and the diameter of the contact portion between the first stirring column and the third screw body is smaller than the diameter of the contact portion between the second stirring column and the third screw body.

[0009] The first stirring column is a conical structure stirring column.

[0010] The second stirring column is a conical structure stirring column.

[0011] In the utility model, the structure that one end of the first transition section and the other end of the second transition section are larger can avoid hiding the rubber, so that the rubber at the rear can move forward smoothly, and at the same time, the strength between screw bodies with different diameters is improved to avoid breaking or damage of the screw bodies; by setting the diameter of the third screw body to be smaller than the second screw body, the diameter of the second screw body to be smaller than the fourth screw body, and the diameter of the second screw body to be smaller than the first screw body, the diameter change of the entire screw body is achieved, the distance between the threads on different screw bodies and the screw body can be changed, and the different lead angles of the threads at different parts can be combined to achieve in-depth and sufficient cutting and mixing of the rubber, thereby improving the quality of the product after extrusion molding; the first stirring column and the second stirring column on the third screw body can fully tear the rubber during mixing, and at the same time, through the different bottom diameter structures of the first stirring column and the second stirring column, the rubber changes the flow channel during the rotation mixing process; the combination of the first screw head and the second screw head can make the rubber discharge quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a front view of the durable protective extrusion screw with a gradually variable thread lead angle proposed by the utility model;

[0013] Figure 2 It is a bottom view of the second transition section of the utility model;

[0014] Figure 3 It is a top view of the first transition section of the utility model;

[0015] In the figure: 1, first screw body, 2, first transition section, 3, second transition section, 4, third transition section, 5, fourth transition section, 6, third screw body, 7, first screw head, 8, second screw head, 9, first thread, 10, second screw body, 11, second thread, 12, first stirring column, 13, second stirring column, 14, fourth screw body, 15, fourth thread. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0017] Reference Figure 1-3The invention discloses a durable protective type extrusion screw with a gradual change in thread lead angle, comprising a first screw body 1, a first transition section 2, a second transition section 3, a third transition section 4, a fourth transition section 5, a third screw body 6, a first screw head 7, a second screw head 8, a first thread 9, a second screw body 10, a second thread 11, a first stirring column 12, a second stirring column 13, a fourth screw body 14 and a fourth thread 15. The third screw body 6 is provided with a first stirring column 12 and a second stirring column 13, the first stirring column 12 and the second stirring column 13 are evenly spiraled outside the third screw body 6, the third screw body 6 is provided with a fourth transition section 5 at both upper and lower ends, and the fourth thread 15 is provided with a first stirring column 12 and a second stirring column 13. A third transition section 4 is provided on the transition section 5, a second screw body 10 is provided on the third transition section 4, a second thread 11 is spiraled on the second screw body 10 from top to bottom, a second transition section 3 is provided on the other end of the second screw body 10, a first transition section 2 is provided on the other end of the second transition section 3, a first screw body 1 is provided on the upper first transition section 2, a first thread 9 is spiraled outside the first screw body 1 from top to bottom, a second screw head 8 is provided on the first screw body 1, a first screw head 7 is provided on the second screw head 8, a fourth screw body 14 is provided under the lower first transition section 2, a fourth thread 15 is spiraled outside the fourth screw body 14 from top to bottom.

[0018] In this embodiment, the connection parts between the first transition section 2, the second transition section 3, the third transition section 4, the fourth transition section 5 and the screw body are all laser cladding technology. By precisely controlling the light beam, the surface of the screw is processed, and the bonding strength between the alloy layer and the base material is high, forming a surface-strengthened screw.

[0019] The lead angle of the fourth thread 15 is the same as that of the first thread 9, which is 30°.

[0020] The lead angle of the second thread 11 is 15°.

[0021] The second stirring column 13 is located in the middle of the two groups of first stirring columns 12 , and the diameter of the contact portion between the first stirring column 12 and the third screw body 6 is smaller than the diameter of the contact portion between the second stirring column 13 and the third screw body 6 .

[0022] The first stirring column 12 is a conical structure stirring column.

[0023] The second stirring column 13 is a conical stirring column.

[0024] The first transition section 2, the second transition section 3, the third transition section 4, the fourth transition section 5, the first screw body 1, the second screw body 10, the third screw body 6, and the fourth screw body 14 are all machined by integrated turning, rough turning, and normalizing treatment.

[0025] In the utility model, the structure in which one end of the first transition section 2 and the other end of the second transition section 3 is larger than the other end can avoid the rubber from being hidden, so that the rubber at the rear can move forward smoothly, and at the same time, the strength between the screw bodies with different diameters is improved to avoid the screw bodies from being broken or damaged; by setting the diameter of the third screw body 6 to be smaller than the second screw body 10, the diameter of the second screw body 10 to be smaller than the fourth screw body 14, and the diameter of the second screw body 10 to be smaller than the first screw body 1, the diameter of the entire screw body is changed, the distance between the threads on different screw bodies and the screw body can be changed, and the depth of the screw body can be achieved. The rubber material can be fully cut and mixed, thereby improving the quality of the extruded product; the thread angles of different parts are different, thereby achieving sufficient treatment of the rubber material during processing and promoting the dissipation of bubbles; the first stirring column 12 and the second stirring column 13 on the third screw body 6 can fully tear the rubber material during mixing, and at the same time, the different bottom diameter structures of the first stirring column 12 and the second stirring column 13 can change the flow channel of the rubber material during the rotation and mixing process, thereby promoting the dissipation of bubbles; the combination of the first screw head 7 and the second screw head 8 can enable the rubber material to be discharged quickly.

[0026] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A durable protective extrusion screw with a gradual change in thread lead angle, comprising a first screw body (1), a first transition section (2), a second transition section (3), a third transition section (4), a fourth transition section (5), a third screw body (6), a first screw head (7), a second screw head (8), a first thread (9), a second screw body (10), a second thread (11), a first stirring column (12), a second stirring column (13), a fourth screw body (14) and a fourth thread (15), characterized in that: The third screw body (6) is provided with a first stirring column (12) and a second stirring column (13), the first stirring column (12) and the second stirring column (13) are evenly coiled outside the third screw body (6), the third screw body (6) is provided with a fourth transition section (5) at both upper and lower ends, the fourth transition section (5) is provided with a third transition section (4), the third transition section (4) is provided with a second screw body (10), the second screw body (10) is coiled with a second thread (11) from top to bottom, and the other end of the second screw body (10) A second transition section (3) is provided on the top, a first transition section (2) is provided at the other end of the second transition section (3), a first screw body (1) is provided on the top first transition section (2), a first thread (9) is spiraled from top to bottom outside the first screw body (1), a second screw head (8) is provided on the first screw body (1), a first screw head (7) is provided on the second screw head (8), a fourth screw body (14) is provided under the bottom first transition section (2), a fourth thread (15) is spiraled from top to bottom outside the fourth screw body (14).

2. The durable protective extrusion screw with a gradual change in thread lead angle according to claim 1, characterized in that: The fourth thread (15) has the same lead angle as the first thread (9), which is 30°.

3. The durable protective extrusion screw with a gradual change in thread lead angle according to claim 1, characterized in that: The lead angle of the second thread (11) is 15°.

4. The durable protective extrusion screw with a gradual change in thread lead angle according to claim 1, characterized in that: The second stirring column (13) is located between the two groups of first stirring columns (12), and the diameter of the contact portion between the first stirring column (12) and the third screw body (6) is smaller than the diameter of the contact portion between the second stirring column (13) and the third screw body (6).

5. The durable protective extrusion screw with a gradual change in thread lead angle according to claim 1, characterized in that: The first stirring column (12) is a conical structure stirring column.

6. The durable protective extrusion screw with a gradual change in thread lead angle according to claim 1, characterized in that: The second stirring column (13) is a stirring column with a conical structure.

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