Protection tube for installing small-specification extrusion die core

Abstract

The utility model discloses a protective tube for installing a small-specification extrusion die core, which comprises a first semicircular block and a second semicircular block, the middle parts of the outer walls of the first semicircular block and the second semicircular block are outer cylindrical surfaces, and the two end parts are outer conical surfaces; according to the utility model, through the combination of the first semi-circular block and the second semi-circular block, the outside of the small mold core is protected, when the small mold core passes through a guide wheel or a wire storage device, a conductor at the combination part is subjected to a bending effect, so that the small mold core is prevented from being damaged, and the service life of the small mold core is prolonged. The bent conductor firstly acts on the two ends of the protection tube, the conductor is almost linear in the combined part, the small mold core is not stressed, and the combined body is not dislocated in the circumferential direction after being subjected to radial acting force through the combination of the concave part and the convex part, so that the small mold core is further protected from being deformed, and the service life of the small mold core is prolonged. Therefore, the subsequent small mold core can be smoothly and perfectly combined with the inner mold core required by large-specification conductor production.

Description

Technical Field

[0001] The utility model relates to the technical field of cable production, in particular to a protective tube for installing a small-size extrusion die core. Background Art

[0002] In the production of insulated wire cores of cross-linked polyethylene insulated power cables and rubber insulated power cables, a set of three-layer co-extrusion heads and dies are required to extrude three different materials, conductor shielding, insulation, and insulation shielding, onto the conductor at the same time. During production, when changing the specifications of the conductor, due to the different conductor diameters, even if the extrusion layer thickness of different specifications of conductors of the same voltage level is the same, it is necessary to stop the machine, disassemble and clean the head, and replace the inner, middle, and outer dies of three different specifications.

[0003] In cable production, when large-sized conductors need to be replaced with small-sized conductors, in order to avoid a series of operations that reduce production efficiency when changing the mold, a small mold core is usually put on the end of the small-sized conductor. Following the conductor routing direction, the small mold core is combined with the inner mold core required for the production of large-sized conductors, so that the mold can be replaced without stopping the machine, and the production of three-layer co-extruded insulated wire cores for small-sized conductors can be quickly switched. However, due to the thin wall thickness of the small mold core, the small mold core is easily deformed when passing through the guide wheel or wire storage device. Therefore, a protective tube for the installation of small-sized extrusion mold cores is needed to meet the needs. Utility Model Content

[0004] The utility model aims to provide a protective tube for installing a small-sized extrusion die core, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a protective tube for installing a small-sized extrusion mold core, comprising a first semicircular block and a second semicircular block, the middle parts of the outer walls of the first semicircular block and the second semicircular block are both outer cylindrical surfaces, and both ends are outer conical surfaces, the interiors of the first semicircular block and the second semicircular block are respectively provided with a first inner cylindrical surface, an inner conical surface and a second inner cylindrical surface, a small mold core is sleeved on the inner conical surface and the second inner cylindrical surface, one end of the small mold core is a cylindrical tube, and the other end is a conical tube, a recessed portion is provided on one end of the plane of the first semicircular block, and a raised portion is provided on one end of the plane of the second semicircular block, and the raised portion is fitted into the recessed portion.

[0006] Preferably, the aperture of the first inner cylindrical surface is the same as the aperture of the second inner cylindrical surface.

[0007] Preferably, the inner conical surface has the same taper as the conical tube.

[0008] Preferably, the aperture of the second inner cylindrical surface is the same as the diameter of the cylindrical tube.

[0009] Preferably, the depth of the recessed portion recessed inward from the plane of the first semicircular block is slightly greater than the length of the raised portion protruding outward from one end of the plane of the second semicircular block.

[0010] Preferably, both ends of the recessed portion do not completely penetrate the transition between the outer cylindrical surface and the outer conical surface, and both ends of the raised portion do not completely extend to the transition between the outer cylindrical surface and the outer conical surface.

[0011] Preferably, a plurality of sockets may be added to one end of the first semicircular block located on the plane, and a plurality of pins may be added to one end of the second semicircular block located on the plane, and the pins may be plugged into the sockets.

[0012] The beneficial effects of the utility model are:

[0013] In the utility model, the outside of the small mold core is protected by the combination of the first semicircular block and the second semicircular block. When passing through the guide wheel or the wire storage device, the conductor at the combined part is subjected to bending, and the bent conductor first acts on the two ends of the protection tube. The conductor is almost straight inside the combined part, and the small mold core will not be subjected to the effect of force. Moreover, through the combination of the recessed part and the raised part, the combination will not be misplaced in the circumferential direction after being subjected to radial force, thereby further protecting the small mold core from deformation, thereby ensuring that the subsequent small mold core can be smoothly and perfectly combined with the inner mold core required for the production of large-size conductors.

[0014] In the utility model, the outer conical surfaces at both ends of the protection tube are arranged so that the assembly can easily pass through obstacles, reduce the resistance when the conductor moves forward, and increase the bending radius. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of a protective tube for installing a small-sized extrusion die core proposed by the utility model;

[0016] Figure 2 This is a schematic diagram of the first semicircular block structure of a protective tube for installing a small-sized extrusion die core proposed by the utility model;

[0017] Figure 3 This is a schematic plan view of the first semicircular block of a protective tube for installing a small-sized extrusion die core proposed by the utility model;

[0018] Figure 4 This is a schematic diagram of the structure of the second semicircular block of a protective tube for installing a small-sized extrusion die core proposed by the utility model;

[0019] Figure 5 This is a schematic plan view of the second semicircular block of a protective tube for installing a small-sized extrusion die core proposed by the utility model;

[0020] Figure 6This is a schematic diagram of a small die core structure of a protective tube for installing a small-sized extrusion die core proposed by the utility model;

[0021] Figure 7 The utility model provides a schematic plan view of the internal structure of a protective tube for installing a small-sized extrusion die core.

[0022] In the figure: 1. first semicircular block; 2. second semicircular block; 3. outer cylindrical surface; 4. outer conical surface; 5. first inner cylindrical surface; 6. inner conical surface; 7. second inner cylindrical surface; 8. small mold core; 9. cylindrical tube; 10. conical tube; 11. recessed part; 12. raised part; 13. socket; 14. latch. DETAILED DESCRIPTION

[0023] 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.

[0024] Reference Figure 1-7 A protective tube for installing a small-sized extrusion mold core comprises a first semicircular block 1 and a second semicircular block 2. The middle parts of the outer walls of the first semicircular block 1 and the second semicircular block 2 are both outer cylindrical surfaces 3, and both ends are outer conical surfaces 4. The first semicircular block 1 and the second semicircular block 2 are respectively provided with a first inner cylindrical surface 5, an inner conical surface 6 and a second inner cylindrical surface 7. A small mold core 8 is sleeved on the inner conical surface 6 and the second inner cylindrical surface 7. One end of the small mold core 8 is a cylindrical tube 9, and the other end is a conical tube 10. A recessed portion 11 is provided on one end of the plane of the first semicircular block 1, and a raised portion 12 is provided on one end of the plane of the second semicircular block 2. The raised portion 12 fits in the recessed portion 11.

[0025] The inner mold core, middle mold, and outer shielding mold sleeve used for normal production of large-sized cables are retained. When it is necessary to replace the small-sized conductor, the small mold core 8 is first put on the end of the small-sized conductor. Along the conductor routing direction, the cylindrical tube 9 of the small mold core 8 is in front, and the conical tube 10 is in the back. Then, the first semicircular block 1 and the second semicircular block 2 are installed on the outside of the small mold core 8 respectively. After installing the protective tube, tape is wrapped around the outside to connect the large-sized conductor and the small-sized conductor, so that the small-sized conductor with the small mold core 8 and the protective tube can move forward with the large-sized conductor. Before the assembly is about to enter the three-layer co-extrusion head, the tape is quickly cut with a tool, the protective tube is removed, and the small mold core 8 is left. Because the three-layer co-extrusion head is generally tilted downward or vertically downward, the small mold core 8 is in the conductor Under the action of gravity and friction of the body, it easily enters the inner mold core, and the two mold cores are completely combined into one. At this time, it is equivalent to installing a small-sized inner mold core online. The gap between the small-sized conductor and the small mold core 8 is within the process range, and no eccentricity will occur. After the small-sized conductor enters the mold, since the diameter of the conductor is smaller than the diameter of the large-sized conductor produced previously, under the premise that the screw speed of the three extruders remains unchanged, that is, the extrusion rate remains unchanged, in order to ensure the size of the three-layer co-extrusion, it is only necessary to increase the line speed, thus realizing multi-specification production without stopping the machine to change the mold, and quickly switching to the production of small-sized three-layer co-extruded insulated wire cores, shortening the time for changing conductor specifications, reducing production costs, and improving the reliability of the extrusion layer.

[0026] Specifically, in this embodiment, the aperture of the first inner cylindrical surface 5 is the same as the aperture of the second inner cylindrical surface 7 .

[0027] Specifically, in this embodiment, the inner conical surface 6 and the conical tube 10 have the same taper.

[0028] Specifically, in this embodiment, the aperture of the second inner cylindrical surface 7 is the same as the diameter of the cylindrical tube 9 .

[0029] Specifically, in this embodiment, the depth of the recessed portion 11 recessed inward from the plane of the first semicircular block 1 is slightly greater than the length of the raised portion 12 protruding outward from one end of the plane of the second semicircular block 2, so that a partial gap is left at the junction of the raised portion 12 and the recessed portion 11, which is convenient for quick identification when the protective tube is removed later.

[0030] Specifically, in this embodiment, both ends of the recessed portion 11 do not completely penetrate the transition between the outer cylindrical surface 3 and the outer conical surface 4, and both ends of the raised portion 12 do not completely extend to the transition between the outer cylindrical surface 3 and the outer conical surface 4, so as to avoid axial displacement between the first semicircular block 1 and the second semicircular block 2 before the tape is wrapped.

[0031] Specifically, in the present embodiment, a plurality of sockets 13 may be added to the first semicircular block 1 at one end of the plane, and a plurality of pins 14 may be added to the second semicircular block 2 at one end of the plane. The pins 14 may be plugged into the sockets 13, which may replace the tape winding method to achieve the connection between the first semicircular block 1 and the second semicircular block 2, thereby improving the installation and disassembly efficiency of the protective tube.

[0032] The above are only preferred specific implementation methods of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the utility model, who makes equivalent replacements or changes based on the technical scheme and utility model concept of the utility model, should be covered by the protection scope of the utility model.

Claims

1. A protective tube for installing a small-sized extrusion die core, comprising a first semicircular block (1) and a second semicircular block (2), characterized in that: The middle parts of the outer walls of the first semicircular block (1) and the second semicircular block (2) are both outer cylindrical surfaces (3), and both ends are outer conical surfaces (4). The first semicircular block (1) and the second semicircular block (2) are each provided with a first inner cylindrical surface (5), an inner conical surface (6) and a second inner cylindrical surface (7) in sequence. A small mold core (8) is sleeved on the inner conical surface (6) and the second inner cylindrical surface (7). One end of the small mold core (8) is a cylindrical tube (9) and the other end is a conical tube (10). A recessed portion (11) is provided on one end of the plane of the first semicircular block (1), and a raised portion (12) is provided on one end of the plane of the second semicircular block (2). The raised portion (12) fits in the recessed portion (11).

2. A protective tube for installing a small-sized extrusion die core according to claim 1, characterized in that: The aperture of the first inner cylindrical surface (5) is the same as the aperture of the second inner cylindrical surface (7).

3. A protective tube for installing a small-sized extrusion die core according to claim 1, characterized in that: The inner conical surface (6) and the conical tube (10) have the same taper.

4. A protective tube for installing a small-sized extrusion die core according to claim 1, characterized in that: The aperture of the second inner cylindrical surface (7) is the same as the diameter of the cylindrical tube (9).

5. The protective tube for installing a small-sized extrusion die core according to claim 1, characterized in that: The depth of the recessed portion (11) recessed inward from the plane of the first semicircular block (1) is slightly greater than the length of the raised portion (12) protruding outward from one end of the plane of the second semicircular block (2).

6. A protective tube for installing a small-sized extrusion die core according to claim 1, characterized in that: Both ends of the recessed portion (11) do not completely penetrate the transition between the outer cylindrical surface (3) and the outer conical surface (4), and both ends of the raised portion (12) do not completely extend to the transition between the outer cylindrical surface (3) and the outer conical surface (4).

7. The protective tube for installing a small-sized extrusion die core according to claim 1, characterized in that: The first semicircular block (1) is located at one end of the plane and can be provided with a plurality of plug holes (13). The second semicircular block (2) is located at one end of the plane and can be provided with a plurality of plug pins (14). The plug pins (14) can be plugged into the plug holes (13).

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