Extrusion mold core for cable

Abstract

The utility model discloses an extrusion mold core for a cable, which comprises a main body 1, two ends of the main body 1 are respectively a connecting end 1.1 and an extrusion end 1.2, the outer side of the main body 1 is in the shape of a cone of which the diameter is reduced from the connecting end 1.1 to the extrusion end 1.2, the main body 1 is axially provided with a conical hole 1.3 of which the diameter is reduced from the connecting end 1.1 to the extrusion end 1.2, and the outer side of the main body 1 is in the shape of a cone of which the diameter is reduced from the connecting end 1.1 to the extrusion end 1.2. A conical hole 1.3 is formed in the middle of the body 1, an extrusion hole 1.4 is formed in the tail end of the conical hole 1.3, a copper pipe 2 is fixedly connected into the extrusion hole 1.4, the length of the copper pipe 2 is smaller than that of the extrusion hole 1.4, and the end, away from the conical hole 1.3, of the copper pipe 2 is located in the extrusion hole 1.4. The utility model provides the extrusion molding die core for the cable, which can avoid high-temperature heat transfer caused by contact between a conductor and an extrusion hole when the conductor penetrates out of the extrusion hole, avoid oxidation of the extrusion hole and ensure the extrusion molding quality.

Description

Technical Field

[0001] This utility model relates to the field of cable manufacturing, specifically to an extrusion die core for cables. Background Technology

[0002] During cable production, an insulation layer is extruded onto the surface of the cable conductor. During the extrusion process, the conductor needs to move along the axis of the extrusion die to ensure high-quality molding on the conductor. However, in actual production, the conductor vibrates continuously as it moves under traction, resulting in poor extrusion molding quality on the conductor surface. In some cases, the vibration amplitude is even significant, especially when the conductor just leaves the extrusion orifice, directly contacting the extrusion die core. This leads to several molding quality problems: First, heat transfer occurs between the conductor and the extrusion die core, causing the contact area to heat up. This delays the setting of the extruded material surrounding that area, leading to cooling and setting deviations. The extruded material is prone to delamination, reducing its overall integrity. Second, after premature setting, the thickness of the extruded layer is significantly uneven, with the thinner side failing to provide adequate insulation. Third, friction occurs when the conductor contacts the extrusion orifice, causing wear and tear. This increases the risk of electric shock during use, potentially damaging the cable. Furthermore, damage to the extrusion orifice surface can lead to oxidation of the orifice structure, hindering the long-term use of the extrusion die core. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide an extrusion die core for cables that avoids high-temperature heat transfer when the conductor comes into contact with the extrusion hole when it passes through the extrusion hole, avoids oxidation of the extrusion hole, and ensures extrusion quality.

[0004] The technical solution adopted by this utility model to solve the above problems is as follows: an extrusion die core for cables, comprising a main body, the two ends of the main body being a connecting end and an extrusion end, the outer side of the main body being a tapered shape with a diameter decreasing from the connecting end to the extrusion end, the main body having a tapered hole with a diameter decreasing from the connecting end to the extrusion end along its axial direction, an extrusion hole being provided at the end of the tapered hole, a copper tube being fixedly connected inside the extrusion hole, the length of the copper tube being shorter than the length of the extrusion hole, and the end of the copper tube away from the tapered hole being inside the extrusion hole.

[0005] Compared with existing technologies, the advantages of this invention are as follows: The conical hole design ensures the density of the extruded material in the extrusion die core, guarantees the molding quality of the extruded material on the conductor, and reduces the formation of air bubbles; the design of the copper tube inside the extrusion hole effectively improves the extrusion quality. Because the copper tube is located inside the extrusion hole, during conductor vibration, the conductor will first contact the copper tube to reduce the vibration amplitude of the conductor, thereby preventing the conductor from contacting the extrusion hole. The end of the copper tube away from the conical hole is inside the extrusion hole, thus preventing the conductor from contacting the outlet end of the extrusion hole. The distance between the extrusion hole and the copper tube ensures the coating effect of the extruded material and prevents the conductor from penetrating. After passing through the extrusion orifice, the conductor may be exposed due to vibration. Simultaneously, when the conductor contacts the copper tube, the contact area remains within the extrusion orifice. The temperature rise caused by this contact will significantly decrease before the conductor leaves the orifice, reducing cooling and shaping deviations in the contact area after separation. This lowers the probability of extrusion delamination and ensures extrusion quality. Furthermore, the copper tube design prevents friction between the conductor and the extrusion orifice, avoiding wear and oxidation. Since both the copper tube and conductor are made of copper, which is relatively soft, friction between them is less likely to cause wear, thus ensuring conductor quality, extrusion quality, and ultimately, cable forming quality.

[0006] As an improvement of this utility model, the outer layer of the copper tube is wrapped with a steel tube, the copper tube and the steel tube are fixedly connected, the steel tube is used to fix the connection with the main body, and the inner hole of the steel tube is used as an extrusion hole. With this improvement, the copper tube is softer and used for connection strength. It is also easy to deform when subjected to external pressure. Therefore, in order to ensure the connection strength of the copper tube, a layer of steel tube is fixed on the outer layer of the copper tube, and the copper tube is fixed by fixing the steel tube.

[0007] As an improvement of this utility model, the extrusion end of the steel pipe has a protruding main body design. Through this improvement, in the traditional design, the outlet of the extrusion end of the extrusion die core is designed as a cylindrical tube to better ensure the stability of the extrusion structure. However, in this utility model, due to the design requirements of the steel pipe, the steel pipe is made of the same material as the die core, and the cylindrical tube design is directly incorporated into the steel pipe, so that the steel pipe has the function of a cylindrical tube, thereby reducing the processing requirements of the die core.

[0008] As an improvement of this utility model, the steel pipe is detachably connected to the main body. This improvement facilitates the replacement of the copper pipe. Although the wear between the copper pipe and the conductor is small, it will still experience significant wear after prolonged use, affecting the extrusion quality and requiring replacement. In this case, only the copper pipe needs to be replaced, without replacing the main body, thus saving replacement costs. Furthermore, by directly changing the specifications of the copper pipe, the outer layer extrusion of different cable conductors can be performed without reinstalling the main body or correcting the axiality of the extrusion holes, reducing installation difficulty and improving replacement efficiency.

[0009] As an improvement of this utility model, a limiting annular groove is provided on the outer wall of the steel pipe. The limiting annular groove is located at the position where the steel pipe protrudes from the main body. A fixing sleeve is fitted around the outer ring of the steel pipe. The end of the fixing sleeve close to the main body is threadedly fixed to the outer side of the main body. The end of the fixing sleeve away from the main body is provided with an abutment rib. The abutment rib abuts against the limiting annular groove along the axial direction to restrict the movement of the steel pipe away from the main body. Through this improvement, the steel pipe is fixed on the main body.

[0010] As an improvement of this utility model, the main body is provided with a spring stop block, which is located at the connection between the conical hole and the extrusion end. The end of the steel pipe near the conical hole is provided with a spring hole, and a spring is provided between the spring stop block and the spring hole. Through this improvement, in order to ensure the stability of the fixed connection of the steel pipe, a transition fit is adopted between the steel pipe and the extrusion hole. Therefore, when it is necessary to remove the steel pipe, there is a certain resistance. Through the spring design, the difficulty of removing the steel pipe can be reduced. The design of the spring stop block and the spring hole are both to ensure the stability of the contact between the spring and the steel pipe in the extrusion hole.

[0011] As an improvement of this utility model, the thickness of the spring stop is greater than the thickness of the steel pipe. The side of the spring stop near the axis abuts against the copper pipe, and the contact surface between the spring stop and the copper pipe is parallel to the conical surface of the conical hole. Through this improvement, the spring stop covers the splicing surface between the steel pipe and the copper pipe, preventing the extruded material from being squeezed into the space between the steel pipe and the copper pipe during the extrusion process. The design of the contact surface between the spring stop and the copper pipe is to prevent the extruded material from being squeezed into the space between the spring stop and the copper pipe.

[0012] As an improvement of this utility model, the outer surface of the fixing sleeve is provided with friction texture, which facilitates tightening the threaded connection between the fixing sleeve and the main body. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall cross-sectional structure of this utility model.

[0014] Figure 2 This is a schematic cross-sectional view of the extrusion hole connection structure of this utility model.

[0015] Figure 3 This is a schematic diagram of the fixing sleeve structure of this utility model.

[0016] The figure shows: 1. Main body, 1.1. Connecting end, 1.2. Extrusion end, 1.3. Conical hole, 1.4. Extrusion hole, 1.5. Spring stop, 2. Copper tube, 3. Steel tube, 3.1. Limiting annular groove, 3.2. Spring hole, 4. Fixing sleeve, 4.1. Abutment rib, 4.2. Friction texture, 5. Spring. Detailed Implementation

[0017] The embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0018] like Figure 1-2 As shown, an extrusion core for cables includes a main body 1, with a connecting end 1.1 and an extrusion end 1.2 at its two ends. The outer side of the main body 1 is tapered, with the diameter decreasing from the connecting end 1.1 to the extrusion end 1.2. A tapered hole 1.3 with the diameter decreasing from the connecting end 1.1 to the extrusion end 1.2 is provided on the axial direction of the main body 1. An extrusion hole 1.4 is provided at the end of the tapered hole 1.3. A copper tube 2 is fixedly connected inside the extrusion hole 1.4. The length of the copper tube 2 is shorter than the length of the extrusion hole 1.4, and the end of the copper tube 2 away from the tapered hole 1.3 is inside the extrusion hole 1.4.

[0019] The copper tube 2 is wrapped with a steel tube 3. The copper tube 2 and the steel tube 3 are fixedly connected. The steel tube 3 is used to fix the main body 1. The inner hole of the steel tube 3 serves as an extrusion hole 1.4. The extrusion end of the steel tube 3 is designed to protrude from the main body 1. The copper tube 2 and the steel tube 3 can be fixed by welding or by high-temperature extrusion.

[0020] The steel pipe 3 is detachably connected to the main body 1. The outer wall of the steel pipe 3 is provided with a limiting annular groove 3.1. The limiting annular groove 3.1 is located at the position where the steel pipe 3 protrudes from the main body 1. The outer ring of the steel pipe 3 is fitted with a fixing sleeve 4. The end of the fixing sleeve 4 near the main body 1 is threadedly fixed to the outer side of the main body 1. The end of the fixing sleeve 4 away from the main body 1 is provided with an abutment rib 4.1. The abutment rib 4.1 and the limiting annular groove 3.1 abut against each other along the axial direction to restrict the movement of the steel pipe 3 away from the main body 1. The main body 1 is provided with a spring stop 1.5. The spring stop 1.5 is located at the connection between the conical hole 1.3 and the extrusion end 1.2. The end of the steel pipe 3 near the conical hole 1.3 is provided with a spring hole 3.2. A spring 5 is provided between the spring stop 1.5 and the spring hole 3.2. The design of the abutment rib 4.1 and the spring stop 1.5 limits the two ends of the steel pipe 3, ensuring that the steel pipe 3 is fixedly connected to the main body 1. At the same time, the steel pipe 3 and the main body 1 adopt a transition fit to ensure the tightness and coaxiality of the connection between the steel pipe 3 and the main body 1. When making a small change in the extrusion diameter specification, the copper pipe 2 specification can be changed instead of replacing the main body 1. This reduces the need for coaxiality correction during the installation of the main body 1 and improves the replacement efficiency.

[0021] The thickness of the spring stop 1.5 is greater than the thickness of the steel pipe 3. The side of the spring stop 1.5 closest to the axis abuts against the copper pipe 2, and the contact surface between the spring stop 1.5 and the copper pipe 2 is parallel to the conical surface of the conical hole 1.3.

[0022] like Figure 3 As shown, the outer surface of the fixing sleeve 4 is provided with friction texture 4.2, which is arranged along the length direction of the fixing sleeve 4, so as to facilitate the application of force when the fixing sleeve 4 is screwed.

[0023] By designing the extrusion die core for cables, during the extrusion molding of the conductor surface, the conductor vibrates and only contacts the copper tube 2, avoiding contact with the steel tube 3. This also prevents the conductor from rapidly heating up and directly passing through the extrusion hole 1.4, thus avoiding affecting the shaping efficiency of the extruded material on the conductor surface. This avoids the phenomenon of extruded material delamination during shaping and also prevents friction between the conductor and the extrusion hole 1.4, which could cause damage to both. Furthermore, it improves the efficiency of changing extruded specifications and ensures the quality of replacement.

[0024] The above description only illustrates the preferred embodiment of this utility model and should not be construed as limiting the scope of the claims. This utility model is not limited to the above embodiments, and variations in its specific structure are permitted. All changes made within the scope of the independent claims of this utility model are also within the scope of protection of this utility model.

Claims

1. An extruded core for cables, characterized in that: The device includes a main body (1), with a connecting end (1.1) and an extrusion end (1.2) at its two ends. The outer side of the main body (1) is tapered, with the diameter decreasing from the connecting end (1.1) to the extrusion end (1.2). The main body (1) has a tapered hole (1.3) with the diameter decreasing from the connecting end (1.1) to the extrusion end (1.2) along its axial direction. The end of the tapered hole (1.3) is provided with an extrusion hole (1.4). A copper tube (2) is fixedly connected inside the extrusion hole (1.4). The length of the copper tube (2) is shorter than the length of the extrusion hole (1.4). The end of the copper tube (2) away from the tapered hole (1.3) is inside the extrusion hole (1.4).

2. The extrusion core for cables according to claim 1, characterized in that: The copper tube (2) is wrapped with a steel tube (3) on the outside. The copper tube (2) and the steel tube (3) are fixedly connected. The steel tube (3) is used to fix the main body (1). The inner hole of the steel tube (3) serves as an extrusion hole (1.4).

3. The extrusion core for cables according to claim 2, characterized in that: The extruded end of the steel pipe (3) is designed to protrude from the main body (1).

4. The extrusion core for cables according to claim 3, characterized in that: The steel pipe (3) is detachably connected to the main body (1).

5. The extrusion core for cables according to claim 4, characterized in that: The outer wall of the steel pipe (3) is provided with a limiting annular groove (3.1). The limiting annular groove (3.1) is located at the position where the steel pipe (3) protrudes from the main body (1). The outer ring of the steel pipe (3) is fitted with a fixing sleeve (4). The end of the fixing sleeve (4) close to the main body (1) is threadedly fixed to the outer side of the main body (1). The end of the fixing sleeve (4) away from the main body (1) is provided with an abutting rib (4.1). The abutting rib (4.1) and the limiting annular groove (3.1) abut against each other along the axial direction to restrict the movement of the steel pipe (3) away from the main body (1).

6. The extrusion core for cables according to claim 5, characterized in that: The main body (1) is provided with a spring stop (1.5), which is located at the connection between the conical hole (1.3) and the extrusion end (1.2). The steel pipe (3) is provided with a spring hole (3.2) at one end near the conical hole (1.3), and a spring (5) is provided between the spring stop (1.5) and the spring hole (3.2).

7. The extrusion core for cables according to claim 6, characterized in that: The thickness of the spring stop (1.5) is greater than the thickness of the steel pipe (3). The side of the spring stop (1.5) closest to the axis abuts against the copper pipe (2), and the contact surface between the spring stop (1.5) and the copper pipe (2) is parallel to the conical surface of the conical hole (1.3).

8. The extrusion core for cables according to claim 5, characterized in that: The outer surface of the fixing sleeve (4) is provided with friction texture (4.2).

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