An extrusion mold for continuous production of low-voltage wires and cables

Abstract

This utility model relates to an extrusion mold for continuously producing low-voltage wires and cables, including a mold core. The key technical feature is that the mold core has a two-part structure, formed by the mating of a first semi-circular mold core piece and a second semi-circular mold core piece of the same size and symmetrically arranged. A positioning structure is provided on the mating surface of the first and second semi-circular mold core pieces. A first external thread is provided at the rear end of the mold core, and a mold core support tube is connected via this first external thread. A second external thread is provided at the rear end of the mold core support tube, and an adjusting nut is connected via this second external thread. This mold allows for the replacement of cable mold cores without stopping the machine, ensuring continuous production without stopping when changing specifications during the production process, thereby significantly reducing production costs.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, specifically to an extrusion mold for low-voltage wires and cables that can be continuously produced. Background Technology

[0002] In particular, the extrusion insulation and sheathing processes for plastic insulated cables require machine shutdown and mold replacement for each specification change. Each specification requires at least 50-80 meters of traction cable at startup, depending on the length of the cooling water tank, and at least 20-30 meters of tail cable at shutdown. These two sections of cable are unusable after use, and each specification change also requires approximately 3 hours of heating and mold adjustment time. This directly increases economic costs by approximately 2000-3000 yuan, wasting materials, energy, and time, thus raising product costs. Utility Model Content

[0003] The purpose of this invention is to provide a reasonably structured, reliable, and continuously producible extrusion mold for low-voltage wires and cables, which allows for the replacement of the cable core without stopping the machine, ensuring continuous production without stopping when changing specifications, thereby greatly reducing production costs.

[0004] The technical solution of this utility model is:

[0005] An extrusion mold for continuously producing low-voltage wires and cables includes a mold core. The key technical features are: the mold core has a two-part structure, formed by the joining of a first semi-circular mold core piece and a second semi-circular mold core piece of the same size and symmetrically arranged; a positioning structure is provided on the joining surface of the first and second semi-circular mold core pieces; a first external thread is provided at the rear end of the mold core, and a mold core support tube is connected to the first external thread; a second external thread is provided at the rear end of the mold core support tube, and an adjusting nut is connected to the second external thread.

[0006] The aforementioned extrusion mold for continuously producing low-voltage wires and cables includes a positioning structure comprising a first positioning hole on a first semi-circular mold core, a second positioning hole on a second semi-circular mold core and opposite to the first positioning hole, and a positioning pin with one end inserted into the first positioning hole and the other end inserted into the second positioning hole.

[0007] In the aforementioned extrusion mold for continuously producing low-voltage wires and cables, the adjusting nut is a T-shaped nut.

[0008] The aforementioned extrusion mold for continuously producing low-voltage wires and cables comprises an expanded cylindrical surface, a conical surface connected to the front end of the expanded cylindrical surface, a small-diameter cylindrical surface connected to the front end of the conical surface, and a reduced-diameter cylindrical surface connected to the rear end of the expanded cylindrical surface. The first external thread is located on the reduced-diameter cylindrical surface, and the outer diameter of the expanded cylindrical surface is equal to the outer diameter of the mold core support tube.

[0009] The beneficial effects of this utility model are:

[0010] 1. The mold core support tube is fixed inside the mold cavity of the extruder head during use. The mold core is delivered to the designated position through the mold core support tube. When changing, the mold core is also pulled out through it. It serves to connect and fix the mold core. Moreover, the mold core can be changed without stopping the machine through the mold core support tube.

[0011] 2. The mold core adopts a two-part structure and uses a positioning structure for docking and positioning. The positioning structure can effectively prevent the first semicircular mold core part and the second semicircular mold core part from moving in the same direction, and is easy to disassemble and replace.

[0012] 3. After installing this mold on the extruder head, adjust the nut clockwise with the extruder head as the fulcrum. This will move the mold core backward through the mold core support tube. Conversely, turning it counterclockwise will move the mold core forward through the mold core support tube. This will adjust the position of the mold core, which is beneficial for adjusting the extrusion pressure in conjunction with the extruder head to adapt to different plastic materials. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the structure of the mold core of this utility model;

[0015] Figure 3 yes Figure 2 A schematic diagram of the cross-section;

[0016] Figure 4 This is a schematic diagram of the adjusting nut of this utility model.

[0017] In the figure: 1. Mold core, 101. First semicircular mold core petal, 102. Second semicircular mold core petal, 2. Mold core support tube, 3. Adjusting nut, 4. Locating pin, 5. First external thread. Detailed Implementation

[0018] The present invention will be described in detail with reference to the accompanying drawings.

[0019] like Figures 1-4 As shown, the extrusion mold for continuously producing low-voltage wires and cables includes a mold core 1, which is a two-part structure. It is formed by joining a first semi-circular mold core part 101 and a second semi-circular mold core part 102 of the same size and symmetrically arranged. The joining surfaces of the first semi-circular mold core part 101 and the second semi-circular mold core part 102 are provided with positioning structures. The rear end of the mold core 1 is provided with a first external thread 5, and a mold core support tube 2 is connected to it through the first external thread 5. The rear end of the mold core support tube 2 is provided with a second external thread, and an adjusting nut 3 is connected to it through the second external thread.

[0020] In this embodiment, the positioning structure includes a first positioning hole on the first semicircular mold core 101, a second positioning hole on the second semicircular mold core 102 opposite to the first positioning hole, and a positioning pin 4 with one end inserted into the first positioning hole and the other end inserted into the second positioning hole. The adjusting nut 3 is a T-shaped nut. The outer peripheral wall of the mold core 1 is composed of an expanded diameter cylindrical surface, a conical surface connected to the front end of the expanded diameter cylindrical surface, a small diameter cylindrical surface connected to the front end of the conical surface, and a reduced diameter cylindrical surface connected to the rear end of the expanded diameter cylindrical surface. The first external thread is located on the reduced diameter cylindrical surface, and the outer diameter of the expanded diameter cylindrical surface is equal to the outer diameter of the mold core support tube 2.

[0021] To enhance positioning, there are two first positioning holes and two second positioning holes, located on the two mating surfaces of the first semicircular mold core 101 and the second semicircular mold core 102. The length of the first external thread 5 at the rear end of the mold core 1 is 10mm, and the length of the internal thread at the front end of the mold core support tube 2 that connects to the first external thread 5 is 15mm. The length of the second external thread at the rear end of the mold core support tube 2 is 100mm, and the length of the internal thread of the adjusting nut 3 is 20mm. The inner diameter of the mold core support tube 2 is 20-100mm, and its length is 500mm.

[0022] All components of this mold are made of 38CrMoAl or 45 steel, with a quenching hardness between HRC55 and 58, and a maximum value of HRC62. The tempering hardness is between HRC20 and HRC30. The heat treatment process requirements are: nitriding layer depth 0.2-0.5mm, temperature 500-550℃, and time 40-60 hours.

[0023] The embodiments of this utility model have been described in detail above, but the content described is only a preferred embodiment of this utility model and should not be considered as limiting the scope of implementation of this utility model. All equivalent changes and improvements made within the scope of this utility model should still fall within the scope of this utility model.

Claims

1. A continuously producible extrusion die for low voltage electric wire and cable comprising a die core, characterized in that: The mold core has a two-part structure, which is formed by the joining of a first semi-circular mold core part and a second semi-circular mold core part of the same size and symmetrically arranged. The joining surfaces of the first semi-circular mold core part and the second semi-circular mold core part are provided with positioning structures. The rear end of the mold core is provided with a first external thread, and a mold core support tube is connected by the first external thread. The rear end of the mold core support tube is provided with a second external thread, and an adjusting nut is connected by the second external thread.

2. The continuously producible extrusion die for low voltage wire and cable according to claim 1, characterized in that: The positioning structure includes a first positioning hole on the first semicircular mold core, a second positioning hole on the second semicircular mold core and opposite to the first positioning hole, and a positioning pin with one end inserted into the first positioning hole and the other end inserted into the second positioning hole.

3. The continuously producible extrusion die for low voltage wire and cable according to claim 1, characterized in that: The adjusting nut is a T-shaped nut.

4. The continuously producible extrusion die for low voltage wire and cable according to claim 1, characterized in that: The outer peripheral wall of the mold core is composed of an expanded cylindrical surface, a conical surface connected to the front end of the expanded cylindrical surface, a small-diameter cylindrical surface connected to the front end of the conical surface, and a reduced-diameter cylindrical surface connected to the rear end of the expanded cylindrical surface. The first external thread is located on the reduced-diameter cylindrical surface, and the outer diameter of the expanded cylindrical surface is equal to the outer diameter of the mold core support tube.

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