Conductor processing die for reducing shielding embedding of medium-voltage cable conductor

Abstract

The utility model relates to the field of cable preparation, in particular to a conductor processing die for reducing embedding of a medium-voltage cable conductor shield, which comprises a die sleeve, a first core die and a second core die which are sequentially sleeved from outside to inside, one end of the die sleeve far away from an extrusion port is fixed and communicated with a first die sleeve, and one end of the first core die far away from the extrusion port is fixed and communicated with a second die sleeve. The end, away from the extrusion opening, of the second core mold is fixedly communicated with a third mold sleeve, the first mold sleeve and the second mold sleeve are slidably connected, the second mold sleeve and the third mold sleeve are slidably connected, the third mold sleeve and the first mold sleeve are slidably connected, and fixing structures are arranged between the first mold sleeve and the second mold sleeve and between the third mold sleeve and the first mold sleeve. By adopting the first die sleeve, the second die sleeve, the third die sleeve and the fixing structure, the gaps among the die sleeves, the core die I and the core die II can be flexibly adjusted, the purpose of adjusting the extrusion pressure of the processing die is achieved, and the production requirements of medium-voltage cables with less or completely eliminated conductor shielding embedding are flexibly met.

Description

Technical Field

[0001] This utility model relates to a conductor processing mold that reduces the embedding of conductor shielding in medium-voltage cables, and particularly to a conductor processing mold that reduces the embedding of conductor shielding in medium-voltage cables applied in the field of cable manufacturing. Background Technology

[0002] The production of insulated cores for medium-voltage cross-linked cables currently mostly employs a three-layer co-extrusion method, where the inner and outer semi-conductive shielding layers and the insulation layer are extruded in a single process. This improves the roundness of the insulated core and the smoothness and tightness of the interface between the insulation and semi-conductive layers, thereby enhancing the cable's withstand voltage and service life. However, despite the use of three-layer co-extrusion equipment and production technology, the issue of conductor shield embedding still exists during the production process.

[0003] To address the issue of embedded conductor shielding, a method for reducing the embedded conductor shielding in medium-voltage cross-linked polyethylene cables employs an improved extrusion die structure design and has achieved a certain market share.

[0004] Chinese invention patent CN117153486A discloses a method for reducing conductor shield embedding in medium-voltage cross-linked polyethylene cables. This method improves the conductor shield embedding by addressing technical improvements in several aspects, including conductor production control, production equipment adjustment, conductor shielding material selection, mold design improvement, and production process control. Through equipment and process modifications, it significantly reduces conductor embedding and improves insulation damage and breakdown caused by partial discharge. It has the advantages of high operability and no additional cost.

[0005] Existing processing molds are usually integrally formed or fixedly installed. After installation, the gap between the mold sleeve and the core mold cannot be adjusted. This means that if it is necessary to adjust the extrusion pressure during the production process to produce medium-voltage cables with less or no conductor shielding, the only way is to adjust the feeding speed through the feeding mechanism. However, the adjustment effect through the feeding mechanism is limited. The width of the mold's extrusion orifice directly affects the extrusion pressure during discharge (the smaller the orifice, the greater the extrusion pressure under the condition of constant feeding speed). Therefore, if the gap between the mold sleeve and the core mold can be adjusted, the extrusion pressure can be adjusted quickly and effectively to obtain a better adjustment effect. Utility Model Content

[0006] In view of the above-mentioned prior art, the technical problem to be solved by this utility model is how to design a processing mold that can adjust the extrusion gap so as to facilitate the adjustment of extrusion pressure.

[0007] To solve the above problems, this utility model provides a conductor processing mold for reducing the embedding of conductor shield in medium voltage cables, including a mold sleeve, a core mold one and a core mold two that are sequentially nested from the outside to the inside. The end of the mold sleeve away from the extrusion port is fixed and connected to the first mold sleeve. The end of the core mold one away from the extrusion port is fixed and connected to the second mold sleeve. The end of the core mold two away from the extrusion port is fixed and connected to the third mold sleeve.

[0008] The first mold sleeve, the second mold sleeve, and the third mold sleeve are sequentially nested from the outside to the inside, and the first mold sleeve and the second mold sleeve, the second mold sleeve and the third mold sleeve, and the third mold sleeve and the first mold sleeve are all slidably connected. The first mold sleeve and the second mold sleeve, and the third mold sleeve and the first mold sleeve are all provided with a fixing structure, which is used to fix the first mold sleeve and the second mold sleeve, and the third mold sleeve and the first mold sleeve.

[0009] In the aforementioned conductor processing mold for reducing the embedded conductor shield of medium-voltage cables, by improving the traditional fixed processing mold into three sets of adjustable, mutually cooperating molds, the gap between the mold sleeve, core mold one, and core mold two can be flexibly adjusted to achieve the purpose of adjusting the extrusion pressure of the processing mold, thus flexibly adapting to the production needs of medium-voltage cables with less or no embedded conductor shield.

[0010] As a further improvement of this application, a first feed pipe is fixed and connected to the periphery of the first mold sleeve, a spacer ring is fixed to the inner side of the first mold sleeve, the inner side of the spacer ring is slidably sealed with the outer side of the second mold sleeve, the first feed pipe is located on the side of the spacer ring near the extrusion port, a first sliding hole is also provided on the periphery of the first mold sleeve, the first sliding hole is located on the side of the spacer ring away from the extrusion port, and the end of the first mold sleeve away from the extrusion port forms a closed end.

[0011] The second mold sleeve is fixed around its periphery and connected to the second feed tube. The second feed tube movably passes through the first sliding hole and extends to the outside of the first mold sleeve. The end of the second mold sleeve away from the extrusion port also forms a closed end.

[0012] The third mold sleeve slides through the closed end of the second mold sleeve, and the outer side of the third mold sleeve is sealed and fitted with the inner wall of the closed end of the second mold sleeve. The end of the third mold sleeve away from the extrusion port is integrally formed with a third feed tube, which slides through the closed end of the first mold sleeve, and the outer side of the third feed tube is sealed and fitted with the inner side of the closed end of the first mold sleeve.

[0013] As a further improvement to this application, the fixing structure includes:

[0014] The second sliding hole is formed on the first mold sleeve and penetrates the side wall of the first mold sleeve radially.

[0015] A connecting protrusion is integrally formed on the outside of the second mold sleeve, and the position of the connecting protrusion corresponds to that of the second sliding hole.

[0016] The fastening bolt has one end threaded onto the connecting protrusion and the other end abuts against the outer wall of the first mold sleeve.

[0017] As a further improvement of this application, the second sliding hole includes a through hole and a limiting groove. The through hole penetrates the side wall of the first mold sleeve and allows the stud of the fastening bolt to move through it. The limiting groove is opened on the outside of the first mold sleeve and communicates with the through hole. The diameter of the nut part of the fastening bolt is larger than the width of the through hole, and the nut part of the fastening bolt is abutted and embedded in the limiting groove.

[0018] As another improvement of this application, the fixing structure also includes an adjusting screw ring, which is rotatably connected to the outer side of the first die sleeve away from the extrusion port. The adjusting screw ring is rotatably sleeved on the third feed tube, and a threaded portion adapted to the thread of the adjusting screw ring is formed on the outer side of the third feed tube.

[0019] As another improvement of this application, the mold sleeve and the first mold sleeve, the first core mold and the second mold sleeve, and the second core mold and the third mold sleeve are all fixed by a detachable structure. The detachable structure includes an outer threaded ring and a threaded groove. Multiple outer threaded rings are provided and fixed to the side of the first mold sleeve, the second mold sleeve, and the third mold sleeve near the extrusion port. Multiple threaded grooves are also provided and opened on the side of the mold sleeve, the first core mold, and the second core mold away from the extrusion port. The outer threaded ring and the threaded groove are threadedly matched.

[0020] Sealing gaskets are movably embedded in the inner side of the connection between the first mold sleeve and the mold sleeve, the inner and outer sides of the connection between the second mold sleeve and the first core mold, and the inner and outer sides of the connection between the third mold sleeve and the second core mold.

[0021] In summary, by sliding the first, second, and third mold sleeves sequentially from the outside to the inside and setting corresponding fixing structures, the positions of the second and third mold sleeves relative to the first mold sleeve can be relatively fixed. This allows for axial adjustment of the relative positions of the first, second, and third mold sleeves, thereby changing the gap between the mold sleeves, core mold one, and core mold two. This achieves the purpose of adjusting the spacing between the mold sleeves, core mold one, and core mold two, facilitating the adjustment of the extrusion pressure of the processing die and flexibly adapting to the production needs of medium-voltage cables with less or no conductor shielding. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the first embodiment of this application;

[0023] Figure 2 This is a cross-sectional view of the first embodiment of this application;

[0024] Figure 3 for Figure 2 Enlarged view of the structure at point A in the image;

[0025] Figure 4This is an exploded view of the first embodiment of this application.

[0026] Explanation of the labels in the diagram:

[0027] 1. Mold sleeve, 2. Core mold one, 3. Core mold two, 4. First mold sleeve, 401. First feed tube, 402. First sliding hole, 403. Second sliding hole, 4031. Through hole, 4032. Limiting groove, 404. Spacer ring, 5. Second mold sleeve, 501. Second feed tube, 502. Connecting protrusion, 6. Third mold sleeve, 601. Third feed tube, 7. Fastening bolt, 8. Adjusting screw ring, 9. External screw ring, 10. Sealing washer, 11. Thread groove. Detailed Implementation

[0028] The following describes one embodiment of this application in detail with reference to the accompanying drawings.

[0029] Implementation method 1:

[0030] Figure 1-4 The present invention illustrates a conductor processing mold for reducing the embedding of conductor shield in medium voltage cables, comprising a mold sleeve 1, a core mold 1 2 and a core mold 2 3 sequentially nested from the outside to the inside. The end of the mold sleeve 1 away from the extrusion port is fixed and connected to the first mold sleeve 4. The end of the core mold 1 away from the extrusion port is fixed and connected to the second mold sleeve 5. The end of the core mold 2 away from the extrusion port is fixed and connected to the third mold sleeve 6.

[0031] The first mold sleeve 4, the second mold sleeve 5, and the third mold sleeve 6 are sequentially sleeved from the outside to the inside, and the first mold sleeve 4 is slidably connected to the second mold sleeve 5, the second mold sleeve 5 is slidably connected to the third mold sleeve 6, and the third mold sleeve 6 is slidably connected to the first mold sleeve 4. The first mold sleeve 4 is slidably connected to the second mold sleeve 5, and the third mold sleeve 6 is slidably connected to the first mold sleeve 4. The fixing structure is used to fix the first mold sleeve 4 to the second mold sleeve 5 and the third mold sleeve 6 to the first mold sleeve 4.

[0032] Based on the above structure, by sliding the first mold sleeve 4, the second mold sleeve 5, and the third mold sleeve 6 sequentially from the outside to the inside, and setting corresponding fixing structures, the positions of the second mold sleeve 5, the third mold sleeve 6, and the first mold sleeve 4 can be relatively fixed. This allows for axial adjustment of the relative positions of the first mold sleeve 4, the second mold sleeve 5, and the third mold sleeve 6, thereby changing the gap between the mold sleeve 1, the core mold 1 2, and the core mold 2 3. This achieves the purpose of adjusting the spacing between the mold sleeve 1, the core mold 1 2, and the core mold 2 3, thus facilitating the adjustment of the extrusion pressure of the processing die and flexibly adapting to the production needs of medium-voltage cables with less or no conductor shielding.

[0033] Furthermore, a first feed pipe 401 is fixed and connected to the periphery of the first mold sleeve 4, a spacer ring 404 is fixed inside the first mold sleeve 4, and the inner side of the spacer ring 404 is slidably sealed with the outer side of the second mold sleeve 5. The first feed pipe 401 is located on the side of the spacer ring 404 near the extrusion port. A first sliding hole 402 is also provided on the periphery of the first mold sleeve 4. The first sliding hole 402 is located on the side of the spacer ring 404 away from the extrusion port. The end of the first mold sleeve 4 away from the extrusion port forms a closed end.

[0034] The second mold sleeve 5 is fixed around its periphery and connected to the second feed pipe 501. The second feed pipe 501 movably passes through the first sliding hole 402 and extends to the outside of the first mold sleeve 4. The end of the second mold sleeve 5 away from the extrusion port also forms a closed end.

[0035] The third mold sleeve 6 slides through the closed end of the second mold sleeve 5, and the outer side of the third mold sleeve 6 is sealed and fitted with the inner wall of the closed end of the second mold sleeve 5. The end of the third mold sleeve 6 away from the extrusion port is integrally formed with a third feed pipe 601. The third feed pipe 601 slides through the closed end of the first mold sleeve 4, and the outer side of the third feed pipe 601 is sealed and fitted with the inner side of the closed end of the first mold sleeve 4.

[0036] Furthermore, the fixing structure includes:

[0037] The second sliding hole 403 is formed on the first mold sleeve 4 and penetrates the side wall of the first mold sleeve 4 radially.

[0038] Connecting protrusion 502 is integrally formed on the outside of the second mold sleeve 5, and the position of connecting protrusion 502 corresponds to that of the second sliding hole 403;

[0039] Fastening bolt 7, one end of which is threaded onto connecting protrusion 502, and one end of fastening bolt 7 is pressed against the outer wall of first mold sleeve 4.

[0040] Furthermore, the second sliding hole 403 includes a through hole 4031 and a limiting groove 4032. The through hole 4031 penetrates the side wall of the first mold sleeve 4 and allows the stud of the fastening bolt 7 to move through. The limiting groove 4032 is opened on the outside of the first mold sleeve 4 and communicates with the through hole 4031. The diameter of the nut part of the fastening bolt 7 is larger than the width of the through hole 4031, and the nut part of the fastening bolt 7 is abutted and embedded in the limiting groove 4032.

[0041] Furthermore, the fixing structure also includes an adjusting screw ring 8, which is rotatably connected to the outer side of the first die sleeve 4 away from the extrusion port. The adjusting screw ring 8 is rotatably sleeved on the third feed pipe 601, and the outer side of the third feed pipe 601 has a threaded portion that is adapted to the thread of the adjusting screw ring 8.

[0042] Workers can adjust the positions of core mold 1 2 and core mold 2 3 by rotating and loosening the fastening bolt 7 or rotating the adjusting screw ring 8. Specifically, when the worker loosens the fastening bolt 7, the nut part of the fastening bolt 7 separates from the limiting groove 4032, so that the second mold sleeve 5 can slide freely along the axial direction of the mold sleeve 1 within the first mold sleeve 4, thereby driving the core mold 1 2 to move and changing the distance between the core mold 1 2 and the mold sleeve 1 and core mold 2 3. After adjustment, simply tightening the fastening bolt 7 is enough to fix the second mold sleeve 5, thereby fixing the position of the core mold 1 2.

[0043] When the operator rotates the adjusting screw ring 8, the adjusting screw ring 8 uses its threaded engagement with the threaded part of the third feed pipe 601 to drive the third feed pipe 601 to slide along the axial direction of the mold sleeve 1, thereby adjusting the position of the third mold sleeve 6 and achieving the purpose of adjusting the distance between the second core mold 3 and the first core mold 2. After adjustment, the adjusting screw ring 8 can form a thread self-locking effect with the threaded part of the third feed pipe 601, so that the position of the third mold sleeve 6 remains fixed.

[0044] Furthermore, mold sleeve 1 is fixed to the first mold sleeve 4, core mold 1 2 to the second mold sleeve 5, and core mold 2 3 to the third mold sleeve 6 by a detachable structure. The detachable structure includes an outer threaded ring 9 and a threaded groove 11. Multiple outer threaded rings 9 are provided and fixed to the side of the first mold sleeve 4, the second mold sleeve 5, and the third mold sleeve 6 near the extrusion port. Multiple threaded grooves 11 are also provided and opened on the side of the mold sleeve 1, the core mold 1 2, and the core mold 2 3 away from the extrusion port. The outer threaded ring 9 and the threaded groove 11 are threadedly matched.

[0045] Sealing gaskets 10 are movably embedded in the inner side of the connection between the first mold sleeve 4 and the mold sleeve 1, the inner and outer sides of the connection between the second mold sleeve 5 and the first core mold 2, and the inner and outer sides of the connection between the third mold sleeve 6 and the second core mold 3.

[0046] By making the die sleeve 1 and the first die sleeve 4, the first core mold 2 and the second die sleeve 5, and the second core mold 3 and the third die sleeve 6 all detachable, it is convenient for workers to disassemble and assemble the die sleeve 1, the first core mold 2, and the second core mold 3. During use, since the die sleeve 1, the first core mold 2, and the second core mold 3 are the main pressure-bearing components of the extrusion, they are more prone to damage than the first die sleeve 4, the second die sleeve 5, and the third die sleeve 6. The easy disassembly and assembly structure makes it easy to replace the die sleeve 1, the first core mold 2, and the second core mold 3 when they are damaged. Compared with replacing the entire processing die, the maintenance cost is lower, and the maintenance efficiency can be improved, reducing the economic losses caused by die damage (mainly reflected in the fact that the longer the maintenance time, the greater the economic losses caused by production delays).

[0047] In light of current practical needs, the above-described embodiments adopted in this application are not limited to this scope of protection. Any changes made within the scope of knowledge possessed by those skilled in the art without departing from the concept of this application still fall within the protection scope of this utility model.

Claims

1. A conductor processing mold for reducing the embedding of conductor shielding in medium-voltage cables, comprising a mold sleeve (1), a first core mold (2), and a second core mold (3) sequentially fitted from the outside to the inside, wherein the end of the mold sleeve (1) away from the extrusion port is fixed and connected to a first mold sleeve (4), the end of the first core mold (2) away from the extrusion port is fixed and connected to a second mold sleeve (5), and the end of the second core mold (3) away from the extrusion port is fixed and connected to a third mold sleeve (6), characterized in that: The first mold sleeve (4), the second mold sleeve (5), and the third mold sleeve (6) are sequentially sleeved from the outside to the inside, and the first mold sleeve (4) and the second mold sleeve (5), the second mold sleeve (5) and the third mold sleeve (6), and the third mold sleeve (6) and the first mold sleeve (4) are all slidably connected. The first mold sleeve (4) and the second mold sleeve (5), and the third mold sleeve (6) and the first mold sleeve (4) are all provided with a fixing structure, which is used to fix the first mold sleeve (4) and the second mold sleeve (5), and the third mold sleeve (6) and the first mold sleeve (4).

2. The conductor processing mold for reducing the embedding of conductor shielding in medium-voltage cables according to claim 1, characterized in that: The first mold sleeve (4) is fixed and connected to a first feed pipe (401) on its periphery. A spacer ring (404) is fixed on the inner side of the first mold sleeve (4). The inner side of the spacer ring (404) is slidably sealed with the outer side of the second mold sleeve (5). The first feed pipe (401) is located on the side of the spacer ring (404) near the extrusion port. A first sliding hole (402) is also provided on the periphery of the first mold sleeve (4). The first sliding hole (402) is located on the side of the spacer ring (404) away from the extrusion port. The end of the first mold sleeve (4) away from the extrusion port forms a closed end. The second mold sleeve (5) is fixed around its periphery and connected to a second feed pipe (501). The second feed pipe (501) moves through the first sliding hole (402) and extends to the outside of the first mold sleeve (4). The end of the second mold sleeve (5) away from the extrusion port also forms a closed end. The third mold sleeve (6) slides through the closed end of the second mold sleeve (5), and the outer side of the third mold sleeve (6) is sealed and fitted with the inner wall of the closed end of the second mold sleeve (5). The third mold sleeve (6) has a third feed tube (601) integrally formed at the end away from the extrusion port. The third feed tube (601) slides through the closed end of the first mold sleeve (4), and the outer side of the third feed tube (601) is sealed and fitted with the inner side of the closed end of the first mold sleeve (4).

3. The conductor processing mold for reducing the embedding of conductor shielding in medium-voltage cables according to claim 2, characterized in that: The fixing structure includes: The second sliding hole (403) is formed on the first mold sleeve (4) and penetrates the side wall of the first mold sleeve (4) radially. A connecting protrusion (502) is integrally formed on the outside of the second mold sleeve (5), and the connecting protrusion (502) corresponds to the position of the second sliding hole (403); A fastening bolt (7) is provided, one end of which is threaded onto a connecting protrusion (502), and the other end of which is pressed against the outer wall of the first mold sleeve (4).

4. The conductor processing mold for reducing the embedding of conductor shielding in medium-voltage cables according to claim 3, characterized in that: The second sliding hole (403) includes a through hole (4031) and a limiting groove (4032). The through hole (4031) penetrates the side wall of the first mold sleeve (4) and allows the stud of the fastening bolt (7) to move through. The limiting groove (4032) is opened on the outside of the first mold sleeve (4) and communicates with the through hole (4031). The diameter of the nut part of the fastening bolt (7) is larger than the width of the through hole (4031), and the nut part of the fastening bolt (7) is abutted and embedded in the limiting groove (4032).

5. A conductor processing mold for reducing the embedding of conductor shielding in medium-voltage cables according to claim 2, characterized in that: The fixing structure also includes an adjusting screw ring (8), which is rotatably connected to the outer side of the first die sleeve (4) away from the extrusion port. The adjusting screw ring (8) is rotatably sleeved on the third feed pipe (601), and the outer side of the third feed pipe (601) has a threaded portion that is adapted to the thread of the adjusting screw ring (8).

6. The conductor processing mold for reducing the embedding of conductor shielding in medium-voltage cables according to claim 1, characterized in that: The mold sleeve (1) is fixed to the first mold sleeve (4), the core mold one (2) is fixed to the second mold sleeve (5), and the core mold two (3) is fixed to the third mold sleeve (6) by a detachable structure. The detachable structure includes an outer threaded ring (9) and a threaded groove (11). The outer threaded ring (9) is provided in multiple ways and is fixed to the side of the first mold sleeve (4), the second mold sleeve (5), and the third mold sleeve (6) near the extrusion port. The threaded groove (11) is also provided in multiple ways and is opened on the side of the mold sleeve (1), the core mold one (2), and the core mold two (3) away from the extrusion port. The outer threaded ring (9) and the threaded groove (11) are threadedly matched. Sealing gaskets (10) are movably embedded in the inner side of the connection between the first mold sleeve (4) and the mold sleeve (1), the inner and outer sides of the connection between the second mold sleeve (5) and the first core mold (2), and the inner and outer sides of the connection between the third mold sleeve (6) and the second core mold (3).

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