An extrusion screw for conveying high-temperature PA material of three-layer insulation wire

Abstract

An extrusion screw for conveying high-temperature PA material of three-layer insulated wires, comprising a screw body, the screw body comprising a fixing part, an extrusion part and a connecting part; the threads are spirally distributed on the outer surface of the extrusion part; the extrusion part comprises a compression section, a transition section and a discharge section; the diameter of the extrusion part gradually increases from the compression section to the discharge section, and the volume of the thread grooves between the threads arranged on the outer surface of the extrusion part gradually decreases. The present invention has strong practicality and low energy consumption, can effectively melt PP material and evenly convey PP material to the end of the extrusion part, so that the PP material can enter the mold in equal amounts, equal pressure and uniformly; the pressure of the PP material adhering to the surface of the three-layer insulated wire is increased, so that the fixation between the PP material and the three-layer insulated wire is more firm and the performance is more stable; the fixing part is evenly stressed, which increases the service life of the screw body and improves the quality of the produced three-layer insulated wire.

Description

Technical Field

[0001] The invention belongs to the technical field of production and processing of three-layer insulated wires, and in particular relates to an extrusion screw rod for conveying high-temperature PA material of the three-layer insulated wires. Background Art

[0002] During the production process of three-layer insulated wires, a PP layer is wrapped on the surface of the three-layer insulated wires. At present, three-layer insulated wire manufacturers use granular PP materials as raw materials, then introduce the PP materials into a spiral feeding device, melt the PP materials through the spiral feeding device, and then transport the PP materials into the mold, and wrap them on the surface of the insulated wire through the mold. In the existing spiral feeding device, a screw is usually used for feeding, and a heating device is wrapped on the outside of the screw, so that the PP material can be melted into a liquid and move forward while being transported by the screw. During production, the company found that in the process of the existing screw conveying PP materials, it is difficult to control the amount and pressure of PP materials entering the mold, which makes the PP material wrapped on the insulated wire uneven, affecting the quality of the three-layer insulated wire after production. Therefore, how to control the quality of the PP material layer wrapped on the surface of the three-layer insulated wire has become an urgent problem for the company to solve. Summary of the invention

[0003] In view of this, the technical problem to be solved by the present invention is to provide an extrusion screw which is highly practical and can stably convey PP materials and is used to convey high-temperature PA materials for three-layer insulation wires.

[0004] In order to solve the above technical problems, the present invention adopts the following scheme: an extrusion screw for conveying high-temperature PA material of three-layer insulated wire, comprising a screw body, the screw body comprising a fixed part connected to an external driving device, an extrusion part with a thread on the outer surface, and a connecting part arranged between the fixed part and the extrusion part; the threads are spirally distributed on the outer surface of the extrusion part; the extrusion part comprises a compression section connected to the connecting part, a transition section connected to the compression section, and a discharge section arranged at the end of the screw body and connected to the transition section; the diameter of the extrusion part gradually increases from the compression section to the discharge section, and the volume of the thread groove between the threads arranged on the outer surface of the extrusion part gradually decreases.

[0005] The end of the extrusion part is tapered to better extrude the PP material toward the mold.

[0006] Among them, the thread forms an extrusion surface for extruding the PP material toward the end of the extrusion surface and a guide surface for guiding the movement of the PP material on the outer surface of the extrusion part; the opening of the extrusion surface is toward the end of the extrusion part, and the opening of the guide surface is toward the direction of the connecting part.

[0007] Among them, the depth of the screw grooves between the threads arranged on the outer surface of the extrusion part gradually decreases from the compression section to the discharge section, which reduces the outflow of PP material and facilitates the control of the outflow of PP material, thereby improving the production quality of the three-layer insulated wire.

[0008] Among them, the threads of the compression section are distributed with equal spacing and equal depth; the threads of the discharge end are distributed with equal spacing and equal depth.

[0009] The helical angle of the guide surface of the discharge section is 45 degrees, which can better guide the molten PP material to move toward the end of the extrusion section.

[0010] Wherein, the screw ridge width of the thread is 4 mm.

[0011] Wherein, a feed port is provided on the compression section, and the feed port is located on the extrusion surface of the thread.

[0012] Wherein, the outer surface of the end of the fixing portion is provided with a spline, and the screw body is connected to an external driving device through the spline arranged on the outer surface of the fixing portion.

[0013] Wherein, the screw body is a mutant screw

[0014] Compared with the prior art, the present invention is designed from the structure of the screw, and by changing the distribution of the threads and the volume of the grooves, the performance of the screw body is improved, the difficulty of equipment modification is reduced, and the cost is saved. The improved screw body is highly practical and has low energy consumption, and can effectively melt the PP material and evenly transport the PP material to the end of the extrusion part, so that the PP material can enter the mold in equal amounts, equal pressures, and evenly; the volume of the thread groove gradually decreases, so that the amount of PP material extruded at one time is reduced, and the amount of PP material entering the mold is more convenient to control, and at the same time, the pressure entering the mold can be increased, and the pressure of the PP material adhering to the surface of the three-layer insulated wire is increased, so that the fixation between the PP material and the three-layer insulated wire is more firmly fixed, and the performance is more stable; the fixing part and the external driving device are connected by a spline, so that the screw body has strong stability, the fixing part is evenly stressed, the service life of the screw body is increased, and the entry amount and pressure of the extruded PP material of the screw body are more convenient to control, and the quality of the produced three-layer insulated wire is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention.

[0016] Figure 2 for Figure 1 AA surface section view in. DETAILED DESCRIPTION

[0017] In order to allow those skilled in the art to better understand the technical solution of the present invention, the present invention is further described below in conjunction with the accompanying drawings.

[0018] like Figure 1 and Figure 2 As shown, an extrusion screw for conveying high-temperature PA material of three-layer insulated wire includes a screw body 1 with a length of 890 mm. In order to improve the extrusion efficiency of the screw body, the screw body 1 is a mutant screw. The screw body 1 includes a fixed part 11 connected to an external driving device, an extrusion part 12 with a thread on the outer surface, and a connecting part 13 arranged between the fixed part 11 and the extrusion part 12. The length of the fixed part is 70 mm, the length of the connecting part is 70 mm, and the length of the extrusion part is 750 mm. The outer surface of the end of the fixed part 11 is provided with a spline, and the spline is an internal spline. The external driving device is provided with an internal spline, and the screw body 1 is connected by a spline between the external spline arranged on the outer side of the fixed part 11 and the internal spline of the external driving device, so that the force of the screw body is uniform during extrusion, avoiding the breakage of the screw body due to uneven reception, which affects the service life of the screw body. The rear portion of the connecting portion 13 is provided with a rectangular thread, which is spirally distributed between the connecting portion and the feeding portion. The diameter of the front portion of the connecting portion 13 is 30 mm.

[0019] In order to better extrude PP material and improve the performance of the screw body, a spirally distributed thread is provided on the outer surface of the extrusion part 12, and the PP material is conveyed by forming a thread groove between the threads. The extrusion part 12 includes a compression section 121 connected to the connection part 13, a transition section 122 connected to the compression section, and a discharge section 123 arranged at the end of the screw body 1 and connected to the transition section. The diameter of the extrusion part gradually increases from the compression section 121 to the discharge section 123, and the volume of the thread groove between the threads arranged on the outer surface of the extrusion part 12 gradually decreases. Among them, the end of the extrusion part 12 is conical, and the length of the end of the extrusion part is 3mm. The compression section is mainly used to extrude the PP material toward the end of the extrusion part 13 and gradually melt the PP material. Its length is 415mm and its diameter is 19.9mm. The transition section is mainly used to extrude the gradually melted PP material to the discharge section, thereby realizing the transition from the compression section to the discharge section. Its length is 120mm. The discharge section is mainly used to transport the PP material out of the screw body and to the mold, and then wrap it on the surface of the three-layer insulation wire through the mold to form a PP material layer on the surface of the three-layer insulation wire; the length of the discharge section is 215mm and the diameter is 25.9mm. The PP material layer is one of the three-layer insulation wire structures.

[0020] In order to better extrude the PP material, the thread forms an extrusion surface 14 for extruding the PP material toward the end of the extrusion surface and a guide surface 15 for guiding the PP material to move on the outer surface of the extrusion section 12; the opening of the extrusion surface is toward the end of the extrusion section 12, and the opening of the guide surface is toward the connection section 13. Through the combined action of the extrusion surface and the guide surface, the PP material is extruded and moved toward the end of the extrusion section while guiding the PP material to move. Through the combination of extrusion and guidance, the PP material is better driven to move toward the end of the extrusion section. The helix angle of the guide surface of the discharge section 123 is 45 degrees. The screw ridge width of the thread is 4mm.

[0021] In order to achieve the gradual reduction of the volume of the thread grooves between the threads arranged on the outer surface of the extrusion part 12, the pitch between the threads arranged on the outer surface of the extrusion part remains unchanged, and the pitch is controlled to be 30mm. The depth of the thread grooves between the threads arranged on the outer surface of the extrusion part gradually decreases from the compression section 121 to the discharge section 123. Since the pitch between the threads remains unchanged, the depth of the grooves between the threads becomes shallower, thereby achieving the gradual reduction of the volume of the thread grooves between the threads. In order to better control the melting efficiency and the direction of movement of the PP material, the threads of the compression section 121 are distributed with equal spacing and equal depth; the threads of the discharge end 123 are distributed with equal spacing and equal depth.

[0022] In order to better control the PP material to enter the screw body and be extruded forward through the screw body, a feed port 1211 is provided on the compression section 121, and the feed port 1211 is located on the extrusion surface of the thread.

[0023] During operation, the PP material enters the screw body through the feed port 1211, and the heater on the outside of the screw body heats the PP material, causing the PP material to gradually melt. At the same time, the screw body continues to rotate and drives the PP material to move toward the end of the extrusion part. During the continuous movement of the PP material, the volume of the gong groove is reduced, so it is more convenient to control the feeding of the PP material. At the same time, the pressure of the PP material can be increased, so that the PP material can enter the mold evenly, in equal amounts, and at equal pressure, thereby improving the quality of the PP material wrapped on the surface of the three-layer insulation wire.

[0024] The above embodiments are only specific implementations of the present invention, and their descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, and these obvious replacement forms all belong to the protection scope of the present invention.

Claims

1. An extrusion screw for conveying high-temperature PA material of three-layer insulation wire, characterized in that: The invention comprises a screw body (1), wherein the screw body (1) comprises a fixing portion (11) connected to an external driving device, an extrusion portion (12) having a thread on its outer surface, and a connecting portion (13) arranged between the fixing portion (11) and the extrusion portion (12); the thread is spirally distributed on the outer surface of the extrusion portion; the extrusion portion (12) comprises a compression section (121) connected to the connecting portion (13), a transition section (122) connected to the compression section, and a discharge section (123) arranged at the end of the screw body (1) and connected to the transition section; the diameter of the extrusion portion gradually increases from the compression section (121) to the discharge section (123), and the volume of the thread grooves between the threads arranged on the outer surface of the extrusion portion (12) gradually decreases; The depth of the screw grooves between the threads arranged on the outer surface of the extrusion part gradually decreases from the compression section (121) to the discharge section (123); the threads of the compression section (121) are distributed at equal intervals and equal depths; the threads of the discharge section (123) are distributed at equal intervals and equal depths; the helix angle of the guide surface of the discharge section (123) is 45 degrees; the outer surface of the end of the fixed part (11) is provided with a spline, and the screw body (1) is connected to an external driving device via the spline arranged on the outer surface of the fixed part (11).

2. The extrusion screw for conveying high-temperature PA material of three-layer insulation wire according to claim 1, characterized in that: The end of the extruding portion (12) is tapered.

3. The extrusion screw for conveying high-temperature PA material of three-layer insulation wire according to claim 2, characterized in that: The screw thread forms an extrusion surface (14) on the outer surface of the extrusion portion (12) for extruding the PP material forward and a guide surface (15) for guiding the movement of the PP material; the opening of the extrusion surface faces the end of the extrusion portion, and the opening of the guide surface faces the connection portion.

4. The extrusion screw for conveying high-temperature PA material of triple-layer insulation wire according to claim 1, characterized in that: The screw ridge width of the thread is 4 mm.

5. The extrusion screw for conveying high-temperature PA material of triple-layer insulation wire according to claim 4, characterized in that: The compression section (121) is provided with a feed port (1211), and the feed port (1211) is located on the extrusion surface of the thread.

6. The extrusion screw for conveying high-temperature PA material of triple-layer insulation wire according to claim 1, characterized in that: The screw body (1) is a mutant screw.

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