Stepped screw head extrusion screw of laser cladding layer

Abstract

The utility model discloses a step type screw head extrusion screw of a laser cladding layer, which comprises a screw head, a screw body, a screw head, an upper thread, an upper leakage ring, a mixing lug, an inner layer alloy lug, a stirring column, a lower leakage ring and a lower thread, the screw head is arranged at the top of the screw body, the screw head is arranged on the screw head, the upper thread is arranged outside the upper end of the screw body, and the mixing lug is arranged on the lower leakage ring. A lower thread is arranged outside the lower end of the screw body; according to the utility model, when the screw body rotates and moves backwards in the extruding and discharging stage, the screw head rotates backwards along with the screw body, and compared with a pure screw head structure, the added screw head structure can enable extruded plastic materials to change the flow speed and the direction at a discharging port and promote dissipation of bubbles; when the screw body rotates and moves backwards, the plane sections of the upper leakage ring and the lower leakage ring can stir, cut and stretch materials, so that the injection molding effect is good.

Description

Technical Field

[0001] The utility model relates to the field of screw processing, in particular to an extrusion screw with a stepped screw head having a laser cladding layer. 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 the core component of the extruder or injection molding machine. The threads of the main section of the extruder screw in the prior art are all spiral structures from top to bottom, which leads to the inability to fully process the rubber compound during mixing, resulting in a large number of bubbles in the extruded product, affecting the quality of the extruded product. In order to solve the above difficulties, it is necessary to develop a stepped screw head extrusion screw with a variable structure of screw teeth and a laser cladding layer that can improve mixing efficiency. Utility Model Content

[0003] The utility model aims to solve the shortcomings in the prior art and proposes an extrusion screw with a stepped screw head having a laser cladding layer.

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

[0005] A stepped screw head extrusion screw with a laser cladding layer comprises a screw head, a screw body, a screw head, an upper thread, an upper leakage ring, a mixing ear, an inner alloy ear, a stirring column, a lower leakage ring and a lower thread. The top of the screw body is a screw head, a screw head is installed on the screw head, an upper thread is arranged outside the upper end of the screw body, a lower thread is arranged outside the lower end of the screw body, the upper thread and the lower thread are spiraled outside the screw body from top to bottom, an upper leakage ring is arranged on the screw body, the upper leakage ring is located below the upper thread, a plurality of mixing ears are arranged on the screw body, the upper section of the mixing ear is larger than the lower section of the mixing ear, and a stirring column is installed in the middle of the mixing ear.

[0006] The inner layer of the mixing ear is an inner alloy ear, and the outer layer of the mixing ear is a laser cladding layer.

[0007] The number of mixing ears on the outer circumference of the screw body is four, and the heights of the four mixing ears are inconsistent.

[0008] There are two groups of upper leakage rings outside the screw body.

[0009] The screw head is a hemispherical structure.

[0010] In the utility model, during the extrusion discharging stage, when the screw body rotates and moves backward, the screw head rotates backward with the screw body. The added screw head structure can change the flow rate and direction of the extruded plastic material at the discharging port, and promote the dissipation of bubbles, compared with the simple screw head structure; when the screw body rotates and moves backward, the plane sections of the upper leakage ring and the lower leakage ring will play a role in stirring, cutting and stretching the material, so that the injection molding effect is good, the bubbles in the material can be quickly removed, and the material can be fully extended and stirred, so that the discharged product quality is better and there are no bubbles; at the same time, the notch parts of the upper leakage ring and the lower leakage ring can make the material flow forward smoothly during the extension process; the mixing ear can play a role in transverse plate cutting and extrusion of the material, and because the height of the mixing ear forms a drop inclined to one side, the material as a whole can flow forward smoothly during the transverse cutting process, and the transverse radii of the upper section and the lower section of the mixing ear are inconsistent, which can promote the mixing of the material; the conical stirring column in the mixing ear can play a role in annular cutting of the material flowing forward. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a front view of the extrusion screw of the stepped screw head with laser cladding layer proposed in the utility model;

[0012] Figure 2 It is a top view of the upper leakage ring of the utility model;

[0013] Figure 3 It is a top view of the mixing ear of the utility model;

[0014] Figure 4 It is a bottom view of the lower leakage ring of the utility model;

[0015] In the figure: 1, screw head, 2, screw body, 3, screw head, 4, upper thread, 5, upper leakage ring, 6, mixing ear, 7, inner alloy ear, 8, stirring column, 9, lower leakage ring, 10, lower 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 stepped screw head extrusion screw of the laser cladding layer includes a screw head 1, a screw body 2, a screw head 3, an upper thread 4, an upper leakage ring 5, a mixing ear 6, an inner alloy ear 7, a stirring column 8, a lower leakage ring 9 and a lower thread 10. The top of the screw body 2 is the screw head 1, and the screw head 3 is installed on the screw head 1. The upper end of the screw body 2 is provided with an upper thread 4, and the lower end of the screw body 2 is provided with a lower thread 10. The upper thread 4 and the lower thread 10 are spiraled outside the screw body 2 from top to bottom. The screw body 2 is provided with an upper leakage ring 5, and the upper leakage ring 5 is located below the upper thread 4. The screw body 2 is provided with a plurality of mixing ears 6, the upper section of the mixing ear 6 is larger than the lower section of the mixing ear 6, and the middle part of the mixing ear 6 is provided with a stirring column 8.

[0018] The inner layer of the mixing ear 6 is an inner alloy ear 7, and the outer layer of the mixing ear 6 is a laser cladding layer.

[0019] The number of mixing ears 6 on the outer circumference of the screw body 2 is four, and the heights of the four mixing ears 6 are inconsistent.

[0020] There are two groups of upper leakage rings 5 ​​outside the screw body 2.

[0021] The screw head 3 is a hemispherical structure.

[0022] In the utility model, during the extrusion discharging stage, when the screw body 2 rotates and moves backward, the screw head 1 rotates backward with the screw body 2. Compared with the simple screw head 1 structure, the added screw head 3 structure and the screw head 1 form a stepped screw head structure, which can change the flow rate and direction of the extruded plastic material at the discharge port and promote the dissipation of bubbles; when the screw body 2 rotates and moves backward, the plane sections of the upper leakage ring 5 and the lower leakage ring 9 will stir, cut and stretch the material, so that the injection molding effect is good, the bubbles in the material can be quickly removed, and the material can be The material is fully extended and stirred, so that the quality of the discharged product is better and there are no bubbles; at the same time, the notches of the upper leakage ring 5 and the lower leakage ring 9 can enable the material to flow forward smoothly during the extension process; the mixing ear 6 can play a transverse plate cutting and extrusion role on the material, and because the height of the mixing ear 6 forms a drop inclined to one side, the whole material can flow forward smoothly during the transverse cutting process, and the transverse radii of the upper and lower sections of the mixing ear 6 are inconsistent, which can promote the mixing of the material; the conical stirring column 8 in the mixing ear 6 can play a circumferential cutting role on the material flowing forward.

[0023] In this embodiment, laser cladding technology is used for the mixing ear 6. By utilizing the extremely high focusing energy of the laser beam, the surface of the mixing ear 6 base is instantly melted to obtain a dense cladding structure that is metallurgically bonded to the base, thereby improving the overall wear resistance of the mixing ear 6.

[0024] In this embodiment, Figure 4The mixing ear 6 on the left side of the screw body 2 is the highest and is closest to the screw head 1. The two ears on the front and rear sides of the screw body 2 are of the same height but lower than the mixing ear 6 on the left. The mixing ear 6 on the right side is lower than the mixing ear 6 on the front side, and the mixing ear 6 on the right side is farthest from the screw head 1. The four mixing ears 6 as a whole form a downwardly inclined structure, which can mix, stir, cut and tear the materials to the maximum extent.

[0025] 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 step-type screw head extrusion screw for laser cladding layer, comprising a screw head (1), a screw body (2), a screw head (3), an upper thread (4), an upper leakage ring (5), a mixing ear (6), an inner alloy ear (7), a stirring column (8), a lower leakage ring (9) and a lower thread (10), characterized in that: The top of the screw body (2) is a screw head (1), on which a screw head (3) is mounted, an upper thread (4) is arranged on the upper end of the screw body (2), and a lower thread (10) is arranged on the lower end of the screw body (2), the upper thread (4) and the lower thread (10) are spiraled from top to bottom outside the screw body (2), an upper leakage ring (5) is arranged on the screw body (2), and the upper leakage ring (5) is located below the upper thread (4), a plurality of mixing ears (6) are arranged on the screw body (2), the upper section of the mixing ear (6) is larger than the lower section of the mixing ear (6), and a stirring column (8) is mounted in the middle of the mixing ear (6).

2. The laser cladding layer step-type screw head extrusion screw according to claim 1, characterized in that: The inner layer of the mixing ear (6) is an inner alloy ear (7), and the outer layer of the mixing ear (6) is a laser cladding layer.

3. The laser cladding layer step-type screw head extrusion screw according to claim 1, characterized in that: The number of mixing ears (6) on the outer circumference of the screw body (2) is four, and the heights of the four mixing ears (6) are inconsistent.

4. The laser cladding layer step-type screw head extrusion screw according to claim 1, characterized in that: The upper leakage rings (5) outside the screw body (2) are divided into two groups.

5. The laser cladding layer extrusion screw with a stepped screw head according to claim 1, characterized in that: The screw head (3) is a hemispherical structure.

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