110kv high-voltage polypropylene insulated power cable production equipment and production method

Abstract

The application relates to the field of cable production equipment, in particular to 110kv high-voltage polypropylene insulated power cable production equipment and a production method thereof, which comprises: a sliding plate, which is slidingly arranged on the conical inner wall of the discharge end of a mold core; a plurality of rollers a are rotatably arranged on the sliding plate; a rotating extrusion mechanism drives the plurality of sliding plates to move so as to clamp the cable through the plurality of rollers a; and a support frame, which is rotatably arranged on the conical inner wall of the discharge end of the mold core; a roller b is rotatably arranged at the end of the support frame; a moving extrusion mechanism drives the plurality of support frames to synchronously rotate so as to clamp or loosen the cable through the plurality of rollers b. The application can adapt to cables of different sizes and has a wider application range by extruding and positioning the cables of different diameters through the plurality of rollers a and the rollers b; and the limiting effect is better by circularly limiting the cable at two positions. In addition, the surface dust of the cable is cleaned and adsorbed before the cable is coated, which helps to improve the coating quality of the insulation layer.

Description

Technical Field

[0001] This invention relates to the field of cable production equipment, and more particularly to a production equipment and method for 110kV high-voltage polypropylene insulated power cables. Background Technology

[0002] 110kV high-voltage polypropylene insulated power cable is a type of power cable that uses polypropylene (PP) as insulation material and is used to transmit high-voltage power. Compared with traditional cross-linked polyethylene insulated cables, this cable has the advantages of being environmentally friendly, having good thermoplasticity, and good heat resistance. During the cable production process, an insulation layer is applied to the outside of the conductor using an extruder.

[0003] Chinese Patent CN114843045B discloses a composite cable and its production equipment, including an extrusion tube, a limiting component, a connecting component, and a cable. During the extrusion of the composite cable, the wire bundle passes through the extrusion tube and the sleeve. By controlling the connecting component, the movement of the limiting component is driven. The limiting component restricts the wire bundle and reduces its sway, thus making the wire bundle more stable when passing through the extrusion tube. This avoids uneven coating during extrusion due to constant swaying of the extrusion tube, resulting in more stable cable production quality and a lower defect rate.

[0004] However, the above-mentioned publicly available solutions have the following shortcomings: the wire harness is limited by the pressure rod and spring structure. Due to the elasticity of the spring and the fact that there is no limiting structure for a certain distance before and after the extruder, the wire harness will cause multiple springs to move asynchronously when it vibrates. This still cannot effectively limit the irregular shaking of the wire harness. In addition, the position of the pressure rod limit is still a considerable distance away from the wrapping outlet, which further reduces the positioning and anti-shaking effect of the wire harness. Summary of the Invention

[0005] The purpose of this invention is to address the problem that the adjustable limiting structure of the spring structure in the background technology cannot effectively limit the vibration of the wire harness, and that due to structural limitations, the positioning position is a long distance from the covering outlet. The invention proposes a production equipment and method for 110kV high-voltage polypropylene insulated power cables.

[0006] On one hand, this invention proposes a 110kV high-voltage polypropylene insulated power cable production equipment, including a screw feeding device, a die head, and a cable. The screw feeding device conveys molten insulating raw material to the die head, and the die head coats the cable with an insulation layer. The die head includes, from the outside to the inside, a die head shell, a die sleeve, a die core, and a die set on the inner wall of the die head shell; it also includes:

[0007] The slide plate is slidably set on the conical inner wall of the mold core discharge end. Rollers a are rotatably set on the slide plate. Multiple slide plates are set along the circumference. A rotary extrusion mechanism is set on the inner wall of the mold core. The rotary extrusion mechanism drives multiple slide plates to move so as to clamp the cable through multiple rollers a.

[0008] The support frame is rotatably mounted on the conical inner wall of the mold core discharge end. Roller b is rotatably mounted at the end of the support frame. Roller b is located between roller a and the mold core discharge port. A movable extrusion mechanism is mounted on the inner wall of the mold core. The movable extrusion mechanism drives multiple support frames to rotate synchronously, thereby clamping or releasing the cable through multiple rollers b.

[0009] Preferably, the die head housing is provided with a feed pipe connected to the output end of the screw feeding device; the outer wall of the die sleeve is provided with a flow groove communicating with the feed pipe, and the flow groove forms an opening at the discharge end of the die sleeve.

[0010] Preferably, it also includes a die adjusting mechanism for adjusting the position of the die along the axial direction of the die core.

[0011] Preferably, the inner wall of the die core feed end is provided with threads; the rotary extrusion mechanism includes a rotating ring that engages with the threads, a support ring rotatably disposed on the rotating ring, and connecting rods at both ends that are rotatably connected to the support ring and the slide plate, respectively.

[0012] Preferably, multiple guide rods are provided on the end face of the support ring facing away from the rotating ring, and multiple guide plates are provided on the inner wall of the mold core, with guide holes provided on the guide plates for the guide rods to pass through.

[0013] Preferably, multiple fixing blocks are provided on the conical inner wall of the mold core, and a support rod is rotatably arranged between two fixing blocks, with the support frame mounted on the support rod.

[0014] Preferably, the movable extrusion mechanism includes a pull rope a, a pull rope b, a movable ring a, and a movable ring b; both movable ring a and movable ring b are slidably disposed on the inner wall of the mold core along the direction of the cable axis, with movable ring a located between movable ring b and the rotating ring; one end of pull rope a is connected to movable ring a, and the other end is connected to and wound around the support rod, one end of pull rope b is connected to movable ring b, and the other end is connected to and wound around the support rod, with pull rope a and pull rope b wound in opposite directions and located on both sides of the support frame respectively.

[0015] Preferably, the support frame is provided with multiple bristles and clearance grooves. A flexible hose passes through the clearance grooves, and the flexible hose is provided with multiple suction holes. A connecting pipe is provided on the flexible hose, and the connecting pipe connects to an external vacuuming device.

[0016] On the other hand, the present invention proposes a production method for a 110kV high-voltage polypropylene insulated power cable production equipment, comprising the following steps:

[0017] S1. The cable is pulled through the machine head. According to the cable diameter, the rotating ring is rotated and moved back and forth at the same time. Then, the support ring and connecting rod drive the slide plate to move. The slide plate moves along the conical surface of the mold core, so that multiple rollers a squeeze the cable from all sides to complete the cable limit.

[0018] S2. Adjust the axial position of moving ring a and moving ring b according to the diameter of the cable. By tensioning the pull rope a or pull rope b, the roller b is pressed against the cable to further limit the cable. At the same time, the brush cleans the surface of the cable. The dust that is cleaned off is absorbed by the hose to ensure the quality of the subsequent insulation layer coating.

[0019] S3. The screw feeding device delivers the molten insulating material to the die head to complete the coating of the insulation layer.

[0020] Compared with the prior art, the present invention has the following beneficial technical effects:

[0021] 1. Based on the adjustment of the rotary extrusion mechanism and the moving extrusion mechanism, multiple rollers a and b are used to extrude and position cables of different diameters. On the one hand, it can adapt to cables of different sizes and has a wider range of applications. On the other hand, by setting the cable in two positions with a ring-shaped limit, the limiting effect is better.

[0022] 2. By cleaning and adsorbing dust on the surface of the cable before wrapping, defects such as bubbles and bulges caused by dust during the wrapping of the insulation layer can be avoided, which helps to improve the wrapping quality of the insulation layer. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of one embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the machine head structure;

[0025] Figure 3 and Figure 4 These are all schematic diagrams of the interior of the engine head casing;

[0026] Figure 5 This is a schematic diagram of the mold core structure;

[0027] Figure 6 This is a schematic diagram of the internal structure of the mold core;

[0028] Figure 7 and Figure 8 All Figure 6 Partial structural diagram;

[0029] Figure 9 for Figure 6 Enlarged diagram of point A in the diagram;

[0030] Reference numerals: 1. Screw feeding device; 2. Die head; 3. Cable; 4. Insulation layer; 5. Connecting frame; 6. Die head housing; 7. Feed pipe; 8. Die sleeve; 9. Flow channel; 10. Die core; 11. Slide plate; 12. Slider; 13. Roller a; 14. Connecting rod; 15. Sphere; 16. Sphere mounting base; 17. Support ring; 18. Guide rod; 19. Guide plate; 20. Rotating ring; 21. Rotating lever; 22. 23. Fixed block; 24. Support rod; 25. Pull rope a; 26. Pull rope b; 27. Support frame; 28. Roller b; 29. ​​Brush bristles; 30. Clearance groove; 31. Flexible hose; 32. Connecting pipe; 33. Moving ring a; 34. Moving ring b; 35. Slide groove; 36. Screw a; 37. Screw b; 38. Fixed plate; 39. Nut; 40. Mouth mold; 41. Adjusting bolt; 42. Dust flow hole; 43. Suction pipe. Detailed Implementation

[0031] Example 1, as Figures 1-8 As shown, the present invention proposes a 110kV high-voltage polypropylene insulated power cable production equipment, including a screw feeding device 1, a die head 2, and a cable 3. The screw feeding device 1 conveys molten insulating material to the die head 2. The die head 2 coats the cable 3 with an insulation layer 4. The die head 2 includes, from the outside to the inside, a die head shell 6, a die sleeve 8, a die core 10, and a die 39 disposed on the inner wall of the die head shell 6. The insulating material is extruded from the gap between the inner wall of the die 39 and the outer wall of the discharge end of the die core 10 and coats the cable 3; it also includes:

[0032] A slide plate 11 is slidably disposed on the conical inner wall of the discharge end of the mold core 10. Rollers a13 are rotatably disposed on the slide plate 11. Multiple slide plates 11 are disposed along the circumferential direction. A rotary extrusion mechanism is disposed on the inner wall of the mold core 10. The rotary extrusion mechanism drives multiple slide plates 11 to move so as to clamp the cable 3 through multiple rollers a13. In an optional embodiment, a slider 12 is disposed on the slide plate 11, and a slide rail is disposed on the conical inner wall of the mold core 10. The slider 12 slides on the slide rail.

[0033] And support frame 26, which is rotatably set on the conical inner wall of the discharge end of mold core 10. Roller b27 is rotatably set at the end of support frame 26. Roller b27 rolls in contact with cable 3. Roller b27 is located between roller a13 and discharge port of mold core 10. Multiple support frames 26 are provided. A movable extrusion mechanism is set on the inner wall of mold core 10. The movable extrusion mechanism drives multiple support frames 26 to rotate synchronously, thereby clamping or releasing cable 3 through multiple rollers b27.

[0034] Furthermore, multiple connecting frames 5 are provided on the die head housing 6, and the connecting frames 5 are connected to the screw feeding device 1. A feed pipe 7 is provided on the die head housing 6, and the feed pipe 7 is connected to the output end of the screw feeding device 1. A flow groove 9 is provided on the outer wall of the die sleeve 8, and the flow groove 9 is connected to the feed pipe 7. The flow groove 9 forms an opening at the discharge end of the die sleeve 8. The molten insulating layer material enters the gap between the die 39 and the die core 10 after passing through the feed pipe 7 and the flow groove 9.

[0035] Furthermore, it also includes a die adjustment mechanism, specifically an adjusting bolt 40; the inner surface of the die 39 is a conical surface, and an extension plate is provided on the die 39, with a threaded hole on the extension plate. The machine head housing 6 has a through hole opposite to the threaded hole. The adjusting bolt 40 passes through the threaded hole and is inserted into the through hole. The end of the adjusting bolt 40 is rotatably connected to the inner wall of the through hole. The extension plate is locked to the machine head housing 6 by the adjusting bolt 40. By rotating the adjusting bolt 40, the axial position of the die 39 can be changed, thereby changing the size of the gap between the die 39 and the die core 10, thus changing the thickness of the insulating layer 4. In an optional embodiment, a smooth rod is provided at the end of the adjusting bolt 40, and the smooth rod is rotatably connected to the inner wall of the through hole by a bearing.

[0036] Example 2, as Figures 6-9 As shown, this invention proposes a 110kV high-voltage polypropylene insulated power cable production equipment. Compared with Embodiment 1, this embodiment details the structure of the rotary extrusion mechanism.

[0037] The inner wall of the feed end of the die core 10 is provided with threads. The rotary extrusion mechanism includes a rotating ring 20 that engages with the threads, a support ring 17 that is rotatably disposed on the rotating ring 20, and a connecting rod 14 whose two ends are respectively rotatably connected to the support ring 17 and the slide plate 11. In an optional embodiment, a ball mounting seat 16 is provided on both the support ring 17 and the slide plate 11. A ball 15 is rotatably disposed on the ball mounting seat 16. Both ends of the connecting rod 14 are connected to the ball 15. Multiple connecting rods 14 are provided along the circumferential direction. In addition, in order to facilitate the rotation of the rotating ring 20, multiple rotating levers 21 are provided on the end face of the rotating ring 20 facing away from the support ring 17.

[0038] Furthermore, an annular groove is provided on the rotating ring 20, and an annular guide rail is provided on the support ring 17. The annular guide rail and the annular groove cooperate. Multiple guide rods 18 are provided on the end face of the support ring 17 facing away from the rotating ring 20. Multiple guide plates 19 are provided on the inner wall of the mold core 10. Guide plates 19 are provided with guide holes for the guide rods 18 to pass through.

[0039] Example 3, as Figures 6-9 As shown, this invention proposes a 110kV high-voltage polypropylene insulated power cable production equipment. Compared with Embodiment 2, this embodiment details the structure of the moving extrusion mechanism.

[0040] Multiple fixing blocks 22 are provided on the conical inner wall of the mold core 10. A support rod 23 is rotatably arranged between two fixing blocks 22, and a support frame 26 is arranged on the support rod 23. The movable extrusion mechanism includes a pull rope a24, a pull rope b25, a movable ring a32, and a movable ring b33. The movable rings a32 and b33 are both slidably arranged on the inner wall of the mold core 10 along the axial direction of the cable 3. The movable ring a32 is located between the movable ring b33 and the rotating ring 20. The inner diameter of the movable ring a32 is smaller than the inner diameter of the movable ring b33. In an optional embodiment, a groove 34 is provided on the outer circumferential surface of both the movable ring a32 and the movable ring b33. Multiple guide rails are provided on the inner wall of the mold core 10. The grooves 34 cooperate with the guide rails to achieve sliding. In this embodiment, there are three grooves 34. In addition, to adjust and fix the positions of the moving rings a32 and b33, screws a35 and b36 are respectively provided along the axial direction of the moving rings a32 and b33. Two fixing plates 37 are provided at the end of the mold core 10. The fixing plates 37 are provided with threaded holes for the screws a35 and b36 to pass through. Nuts 38 are rotatably installed on the fixing plates 37. Nuts 38 cooperate with screws a35 and b36. The rotatable connection between nuts 38 and fixing plates 37 is as follows: an annular groove is provided on the fixing plates 37. The cross-section of the annular groove is dovetail-shaped. An annular slide rail is installed in the annular groove. Then, the annular slide rail and nuts 38 are connected by spot welding. For easy installation, both the fixing plates 37 and the annular slide rail are spliced ​​from multiple sections. One end of the pull rope a24 is connected to the moving ring a32, and the other end... The pull rope b25 is connected to and wound around the support rod 23. One end of the pull rope b25 is connected to the moving ring b33, and the other end is connected to and wound around the support rod 23. The winding directions of the pull rope a24 and the pull rope b25 are opposite and are located on both sides of the support frame 26 respectively. Moving the moving ring a32 outward causes the pull rope a24 to move, making the support frame 26 rotate counterclockwise. The roller b27 presses against the cable 3. Moving the moving ring b33 outward causes the support frame 26 to rotate clockwise. The roller b27 unfolds outward and disengages from the cable 3, which can be used to clamp cables 3 with a larger diameter. It should be noted that when moving the moving ring a32 outward, the pull rope b25 must first be loosened by moving the moving ring b33 in the opposite direction. Conversely, when moving the moving ring b33 outward, the pull rope a24 must first be loosened by moving the moving ring a32 in the opposite direction.

[0041] Example 4, as Figure 9 As shown, the present invention proposes a 110kV high-voltage polypropylene insulated power cable production equipment. Compared with Embodiment 3, this embodiment details the cleaning structure of the cable 3 before the insulation layer 4 is applied.

[0042] Multiple brush bristles 28 are provided on the support frame 26, and the brush bristles 28 contact the cable 3. The support frame 26 is provided with clearance grooves 29, and flexible hoses 30 pass through the multiple clearance grooves 29. Multiple dust suction holes are provided on the flexible hoses 30, and connecting pipes 31 are provided on the flexible hoses 30. The connecting pipes 31 are connected to external dust suction equipment. Specifically, dust flow holes 41 are opened on the mold core 10 and the mold sleeve 8, and the dust flow holes 41 are connected to the connecting pipes 31. A dust suction pipe 42 is provided on the machine head housing 6, which is opposite to the dust flow holes 41, and the dust suction pipe 42 is connected to external dust suction equipment. The dust suction holes are closer to the discharge port of the mold core 10, which can clean the surface of the cable 3 before the insulation layer 4 is wrapped around the cable 3, so as to ensure the wrapping quality.

[0043] Example 5: A method for producing a 110kV high-voltage polypropylene insulated power cable according to the present invention, using the 110kV high-voltage polypropylene insulated power cable production equipment of Example 4, specifically includes the following steps:

[0044] S1. Cable 3 is pulled through the machine head 2. According to the diameter of cable 3, the rotating ring 20 is rotated and moved back and forth at the same time. Then, the support ring 17 and the connecting rod 14 drive the slide plate 11 to move. The slide plate 11 moves along the conical surface of the mold core 10, so that multiple rollers a13 squeeze the cable 3 from all sides, thus completing the limiting of cable 3.

[0045] S2. According to the diameter of the cable 3, adjust the axial position of the moving ring a32 and the moving ring b33. By tensioning the pull rope a24 or pull rope b25, the roller b27 is pressed against the cable 3 to further limit the cable 3. At the same time, the brush 28 cleans the surface of the cable 3. The dust that is cleaned off is absorbed by the hose 30 to ensure the quality of the subsequent insulation layer coating.

[0046] S3. The screw feeding device 1 conveys the molten insulating raw material to the die head 2 to complete the coating of the insulating layer 4.

[0047] In summary, when in use, this invention, through the adjustment of the rotary extrusion mechanism and the moving extrusion mechanism, uses multiple rollers a13 and b27 to extrude and position cables 3 of different diameters. On the one hand, it can adapt to cables 3 of different sizes, thus broadening its application range. On the other hand, by using annular limiting at two positions on the cable 3, the limiting effect is better, because single-point limiting in the prior art is difficult to limit the transmission of cable 3's own vibration. However, limiting at two positions can effectively suppress the transmission of cable 3's own vibration, allowing the cable 3 at the position of the insulation layer 4 to move stably. Furthermore, due to the proximity of roller b27 to the covering position and the rigid limiting of rollers a13 and b27, cables 3 of different sizes can be pulled and moved very stably. In addition, by cleaning and adsorbing dust on the surface of the cable 3 before covering it, defects such as bubbles and bulges caused by dust during the covering of the insulation layer 4 can be avoided, which helps to improve the covering quality of the insulation layer 4.

[0048] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A 110kV high-voltage polypropylene insulated power cable production equipment, comprising a screw feeding device (1), a die head (2), and a cable (3), wherein the screw feeding device (1) conveys molten insulating raw material to the die head (2), the die head (2) covers the cable (3) with an insulation layer (4), and the die head (2) comprises, from the outside to the inside, a die head shell (6), a die sleeve (8), a die core (10), and a die (39) disposed on the inner wall of the die head shell (6); characterized in that, Also includes: The slide plate (11) is slidably set on the conical inner wall of the discharge end of the mold core (10). Roller a (13) is rotatably set on the slide plate (11). Multiple slide plates (11) are set along the circumferential direction. A rotary extrusion mechanism is set on the inner wall of the mold core (10). The rotary extrusion mechanism drives multiple slide plates (11) to move so as to clamp the cable (3) through multiple rollers a (13). And support frame (26), multiple of which are rotatably arranged on the conical inner wall of the discharge end of the mold core (10), and roller b (27) is rotatably arranged at the end of the support frame (26). The roller b (27) is located between the roller a (13) and the discharge port of the mold core (10). A movable extrusion mechanism is arranged on the inner wall of the mold core (10). The movable extrusion mechanism drives multiple support frames (26) to rotate synchronously, thereby clamping or releasing the cable (3) through multiple rollers b (27). The die core (10) has a threaded inner wall at the feed end; the rotary extrusion mechanism includes a rotating ring (20) that engages with the thread, a support ring (17) that is rotatably mounted on the rotating ring (20), and a connecting rod (14) that is rotatably connected at both ends to the support ring (17) and the slide plate (11), respectively; multiple fixing blocks (22) are provided on the conical inner wall of the die core (10), a support rod (23) is rotatably mounted between two fixing blocks (22), and a support frame (26) is mounted on the support rod (23); The movable extrusion mechanism includes a pull rope a (24), a pull rope b (25), a movable ring a (32), and a movable ring b (33); the movable ring a (32) and the movable ring b (33) are both slidably disposed on the inner wall of the mold core (10) along the axial direction of the cable (3), and the movable ring a (32) is located between the movable ring b (33) and the rotating ring (20); one end of the pull rope a (24) is connected to the movable ring a (32), and the other end is connected to and wound around the support rod (23); one end of the pull rope b (25) is connected to the movable ring b (33), and the other end is connected to and wound around the support rod (23); the winding directions of the pull rope a (24) and the pull rope b (25) are opposite and are located on both sides of the support frame (26).

2. The 110kV high-voltage polypropylene insulated power cable production equipment according to claim 1, characterized in that, The housing (6) of the die head is provided with a feed pipe (7) that is connected to the output end of the screw feeding device (1); the outer wall of the die sleeve (8) is provided with a flow groove (9) that communicates with the feed pipe (7), and the flow groove (9) forms an opening at the discharge end of the die sleeve (8).

3. The 110kV high-voltage polypropylene insulated power cable production equipment according to claim 1, characterized in that, It also includes a die adjustment mechanism for adjusting the position of the die (39) along the axial direction of the die core (10).

4. The 110kV high-voltage polypropylene insulated power cable production equipment according to claim 1, characterized in that, Multiple guide rods (18) are provided on the end face of the support ring (17) facing away from the rotating ring (20), and multiple guide plates (19) are provided on the inner wall of the mold core (10). The guide plates (19) are provided with guide holes for the guide rods (18) to pass through.

5. The 110kV high-voltage polypropylene insulated power cable production equipment according to claim 1, characterized in that, Multiple brush bristles (28) are provided on the support frame (26), and clearance grooves (29) are provided on the support frame (26). A hose (30) passes through the multiple clearance grooves (29). Multiple suction holes are provided on the hose (30), and a connecting pipe (31) is provided on the hose (30). The connecting pipe (31) connects to the external vacuuming equipment.

6. A method for producing a 110kV high-voltage polypropylene insulated power cable, using the 110kV high-voltage polypropylene insulated power cable production equipment as described in claim 5, characterized in that, Includes the following steps: S1. The cable (3) is pulled through the machine head (2). According to the diameter of the cable (3), the rotating ring (20) is rotated to make it rotate and move back and forth at the same time. Then, the sliding plate (11) is driven to move through the support ring (17) and the connecting rod (14). The sliding plate (11) moves along the conical surface of the mold core (10) so that multiple rollers a (13) squeeze the cable (3) from all sides to complete the limiting of the cable (3). S2. According to the diameter of the cable (3), adjust the axial position of the moving ring a (32) and the moving ring b (33). By tensioning the pull rope a (24) or pull rope b (25), the roller b (27) is pressed against the cable (3) to further limit the cable (3). At the same time, the brush bristles (28) clean the surface of the cable (3). The dust that is cleaned off is absorbed by the hose (30) to ensure the quality of the subsequent insulation layer coating. S3. The screw feeding device (1) conveys the molten insulating material to the die head (2) to complete the coating of the insulating layer (4).

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