Wear-resistant and bending-resistant plastic power line and manufacturing equipment thereof

Abstract

The invention discloses a wear-resistant and bending-resistant plastic power line and manufacturing equipment thereof, and relates to the technical field of wire and cable manufacturing, the wear-resistant and bending-resistant plastic power line comprises a conductor layer, a first insulating layer is fixedly arranged on the outer layer of the conductor layer, and a reinforcing layer is fixedly wound on the outer ring of the first insulating layer; the reinforcing layer is made of aramid fibers and spirally wound on the outer side of the first insulating layer, a second insulating layer is fixedly arranged on the outer side of the reinforcing layer, the extrusion molding equipment for the insulating layers comprises an extruder, a mixing box is fixedly arranged on the extruder, a first driving motor is fixedly arranged at one end of the extruder, and a second driving motor is fixedly arranged at the other end of the extruder. One end of the PVC sheath is fixedly connected with the base, the other end of the PVC sheath is fixedly connected with a PVC extrusion die, the PVC extrusion die is fixedly connected with a cooling box, and two times of molding cooling can be carried out in the cooling box, so that the problems that in the prior art, a conventional PVC sheath is prone to surface abrasion, and the extrusion process of traditional molding equipment easily causes insufficient bonding force of all layers and has interlayer stripping risks are solved.

Description

Technical Field

[0001] This invention relates to the field of wire and cable manufacturing technology, specifically to a wear-resistant and bend-resistant plastic power cord and its manufacturing equipment. Background Technology

[0002] Power cords are wires that connect power sources and electrical equipment to transmit electrical energy. Most existing power cords use PVC sheaths to increase their heat resistance and ductility. The sheaths are extruded using molding equipment.

[0003] Chinese utility model patent CN215921200U discloses a PVC plastic power cord forming device, comprising a support frame and an extruder and a limiting mechanism respectively mounted on the support frame. One end of the limiting mechanism is connected to the discharge end of the extruder, and the output end of the extruder is provided with an extrusion die for extruding PVC pipe. One end of the limiting mechanism is connected to the outer wall of the extrusion die. The limiting mechanism includes a fixed frame, a limiting sleeve, and a hollow rotating shaft for limiting the PVC pipe. The fixed frame is mounted on the support frame, and the limiting sleeve is mounted on the fixed frame. The limiting sleeve has a concentric circle structure. This PVC plastic power cord forming device rapidly cools and shapes the PVC pipe through the cooperation of a heat dissipation ring, a cooling pipe, and a hollow rotating shaft. A second motor drives the hollow rotating shaft to rotate, facilitating the smoothing of the outer surface of the PVC pipe connected to the inner wall of the hollow rotating shaft.

[0004] 1. The design of the cooling pipe and heat dissipation ring inside the limiting sleeve allows the PVC pipe to cool down quickly. The outer layer solidifies rapidly while the inner layer remains at a high temperature, creating a temperature gradient. This results in uneven material shrinkage, and the difference in shrinkage between the inner and outer layers generates internal stress, weakening the interlayer bonding force. Over long-term use, this can easily lead to interlayer peeling.

[0005] 2. When PVC raw materials are fed into the extruder through the feed port to produce PVC sheaths, the raw materials are easily not mixed sufficiently. In addition, conventional PVC sheaths are prone to surface wear under frequent friction, which leads to a decrease in insulation performance. Summary of the Invention

[0006] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a wear-resistant and bend-resistant plastic power cord and its manufacturing equipment, which solves the problems in the prior art where conventional PVC sheaths are prone to surface wear under frequent friction scenarios, and where the traditional sheath molding equipment's extrusion process directly cools the PVC pipe from the outer ring, easily leading to internal stress caused by the difference in shrinkage between the inner and outer layers, weakening the interlayer bonding force, and posing a risk of interlayer peeling in subsequent cable manufacturing.

[0007] To achieve the above objectives, the present invention proposes a wear-resistant and bend-resistant plastic power cord. The wear-resistant and bend-resistant plastic power cord includes a conductor layer, a first insulation layer fixedly disposed on the outer layer of the conductor layer, a reinforcing layer fixedly wound around the outer ring of the first insulation layer, the reinforcing layer being made of aramid fiber and spirally wound on the outside of the first insulation layer, and a second insulation layer fixedly disposed on the outside of the reinforcing layer.

[0008] As a further aspect of the present invention: the conductor layer is a multi-strand tin-plated copper wire stranded structure, and the first insulating layer is made of modified PVC with 15-25% nano-silica added.

[0009] As a further aspect of the present invention: the second insulating layer is made of TPU elastomer.

[0010] As a further aspect of the present invention: a protective coating is coated on the outer side of the second insulating layer, the protective coating being a UV-curable polyurethane coating.

[0011] The manufacturing equipment for the aforementioned wear-resistant and bend-resistant plastic power cord includes a mounting base plate, on which an extruder is fixedly mounted. A mixing chamber is fixedly mounted on the extruder. A first drive motor is fixedly mounted at one end of the extruder, and a PVC extrusion die is fixedly connected to the other end. A cooling box is fixedly connected to the PVC extrusion die. A screw conveyor connected to the first drive motor is rotatably mounted inside the extruder. Baffles are fixedly mounted at both ends of the cooling box. A water-cooling jacket is fixedly mounted inside the baffles near the PVC extrusion die. A pair of suspension supports are fixedly mounted inside the cooling box. A magnetic levitation tube is suspended inside the suspension supports. A water-cooling component for secondary cooling is provided on the side of the cooling box.

[0012] As a further embodiment of the present invention: a first bracket and a second bracket are fixedly provided on the mounting base plate; the extruder is fixedly provided on the first bracket, the cooling box is fixedly provided on the second bracket, a third bracket is fixedly provided on the extruder, and the mixing box is fixedly provided on the third bracket.

[0013] As a further aspect of the present invention: a second drive motor is fixedly installed on the mixing box, a first inlet is provided on the mixing box, and a stirring element is fixedly connected to the output shaft of the second drive motor, the stirring element being disposed inside the mixing box.

[0014] As a further embodiment of the present invention: a discharge port is provided below the mixing box, a second inlet is provided above the extruder, the discharge port is located directly above the second inlet, and a valve is fixedly provided on the discharge port.

[0015] As a further embodiment of the present invention: the water-cooling assembly includes a water storage tank and a water pump; the water storage tank is placed on the mounting base plate, the water pump is fixedly installed on the mounting base plate near the water storage tank, the water inlet end of the water pump is fixedly provided with a water pumping pipe, the water outlet end of the water pump is fixedly provided with a water injection pipe, the water pumping pipe is connected to the water storage tank, and the water injection pipe is connected to the cooling tank.

[0016] As a further aspect of the present invention, a water outlet pipe is fixedly installed between the water storage tank and the cooling tank.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. By setting a first insulation layer made of modified PVC with 15-25% nano silica added outside the conductive layer, the overall tensile strength of the cable is improved. A reinforcing layer made of aramid fiber is fixedly wound around the outer ring of the first insulation layer, and a second insulation layer made of TPU (thermoplastic polyurethane) elastomer is fixedly set outside the reinforcing layer to increase the cable's anti-kink performance and improve its resilience after repeated bending, which can increase the cable's wear resistance and bending resistance.

[0019] 2. By installing a mixing chamber on the extruder, the raw materials can be fully mixed before extrusion. The cooling chamber incorporates two cooling processes: pre-cooling and secondary cooling. The outer ring of the PVC pipe sleeve is initially cooled by a water-cooling jacket, while the inner ring is initially cooled by a magnetic levitation tube. This achieves relatively uniform pre-cooling of the inner and outer rings of the PVC pipe sleeve, preventing easy delamination during subsequent installation. After pre-cooling, secondary cooling is achieved through a water-cooling assembly. Secondary cooling involves direct rinsing with cooling water; the pre-cooling process prevents direct contact with cooling water and avoids shrinkage of the PVC pipe sleeve. Attached Figure Description

[0020] Figure 1 This is an exploded view of a wear-resistant and bend-resistant plastic power cord according to the present invention.

[0021] Figure 2 This is a three-dimensional structural diagram of a manufacturing equipment suitable for wear-resistant and bend-resistant plastic power cords according to the present invention;

[0022] Figure 3 For the present invention Figure 2 A sectional view;

[0023] Figure 4 For the present invention Figure 3 Explosion diagram of the cooling box;

[0024] Figure 5 For the present invention Figure 3 Enlarged view of point A;

[0025] Figure 6 For the present invention Figure 3 Enlarged view of point B.

[0026] In the diagram: 1. Conductor layer; 2. First insulation layer; 3. Reinforcing layer; 4. Second insulation layer; 5. Mounting base plate; 6. Extruder; 7. First drive motor; 8. Mixing box; 9. Second feed inlet; 10. PVC extrusion die; 11. Cooling box; 12. Water storage tank; 13. Water injection pipe; 14. Water pump; 15. Water extraction pipe; 16. Water outlet pipe; 17. First support; 18. Second support; 19. Third support; 20. Second drive motor; 21. First feed inlet; 22. Screw conveyor; 23. Magnetic levitation tube; 24. Discharge port; 25. Valve; 26. Suspension support; 27. Baffle; 28. Water cooling jacket. Detailed Implementation

[0027] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] like Figure 1 As shown, a wear-resistant and bend-resistant plastic power cord includes a conductor layer 1, which is a multi-strand tin-plated copper wire stranded structure used for power transmission. The multi-strand stranding arrangement balances conductivity and reduces skin effect. A first insulation layer 2 is fixedly disposed on the outer layer of the conductor layer 1. The first insulation layer 2 is made of modified PVC with 15-25% added nano-silica. The first insulation layer 2 provides electrical isolation between the conductor layer 1 and the external environment, improves the overall tensile strength of the cable, reduces cold flow, and inhibits deformation during long-term use. The outer ring of the first insulation layer 2 is fixed. A reinforcing layer 3 is provided in the fixed winding. The reinforcing layer 3 is made of aramid fiber and is spirally wound on the outside of the first insulation layer 2. The reinforcing layer 3 is used to absorb external impact energy and reduce the risk of stress concentration in the conductor layer 1. A second insulation layer 4 is fixedly provided on the outside of the reinforcing layer 3. The second insulation layer 4 is made of TPU (thermoplastic polyurethane) elastomer. It is used to increase the cable's anti-kink performance and improve its resilience after repeated bending. In order to further increase the cable's abrasion resistance, a protective coating can be applied to the outside of the second insulation layer 4. Specifically, it can be a UV-cured polyurethane coating.

[0029] like Figure 2-6As shown, a manufacturing device suitable for wear-resistant and bend-resistant plastic power cords includes a mounting base plate 5, an extruder 6 fixedly mounted on the mounting base plate 5, a mixing chamber 8 fixedly mounted on the extruder 6, a first drive motor 7 fixedly mounted at one end of the extruder 6, and a PVC extrusion die 10 fixedly connected to the other end, a cooling chamber 11 fixedly connected to the PVC extrusion die 10, a first bracket 17 and a second bracket 18 fixedly mounted on the mounting base plate 5; the extruder 6 is fixedly mounted on the first bracket 17, the cooling chamber 11 is fixedly mounted on the second bracket 18, a third bracket 19 is fixedly mounted on the extruder 6, the mixing chamber 8 is fixedly mounted on the third bracket 19, a screw conveyor 22 is rotatably mounted inside the extruder 6, the output shaft of the first drive motor 7 is fixedly connected to the screw conveyor 22, a second drive motor 20 is fixedly mounted on the mixing chamber 8, a first feed inlet 21 is provided on the mixing chamber 8, a stirring component is fixedly connected to the output shaft of the second drive motor 20, the stirring component is located inside the mixing chamber 8, the stirring component is a conventional stirring shaft and stirring rod connection structure, and the second drive motor 20... The output shaft of 0 is fixedly connected to the stirring shaft in the stirring component. The structure of the stirring component is not shown in the figure. A discharge port 25 is provided below the mixing box 8, and a second inlet port 9 is provided above the extruder 6. The discharge port 25 is located directly above the second inlet port 9. A valve 24 is fixedly provided on the discharge port 25. A mixture of PVC raw material and nano silica is added to the mixing box 8 through the first inlet port 21. The second drive motor 20 is started to drive the stirring component to stir the mixture. Then, the valve 24 is opened to inject the mixture into the extruder 6 through the second inlet port 9. The first drive motor 7 is started to drive the screw conveyor 22 to rotate and input the mixture into the PVC extrusion die 10 at a uniform speed. The PVC extrusion die 10 is the prior art. The PVC tube sleeve extruded through the extrusion shaft of the PVC extrusion die 10 enters the cooling box 11. After being cooled twice in the cooling box 11, it is discharged through the end of the cooling box 11. In specific implementation, a collection component can be set on the side of the cooling box 11 away from the PVC extrusion die 10 to assist in the conveying and collection of the PVC tube sleeve.

[0030] In one embodiment of this invention, baffles 27 are fixedly installed at both ends of the cooling box 11. A water-cooling jacket 28 is fixedly installed inside the baffle 27 near the PVC extrusion mold 10. PVC pipes discharged from the PVC extrusion mold 10 enter through the water-cooling jacket 28, and exit through the baffle 27 at the other end where no water-cooling jacket 28 is installed. A pair of suspension supports 26 are fixedly installed inside the cooling box 11. A magnetic levitation tube 23 is suspended inside the suspension supports 26. The magnetic levitation tube 23 is a titanium alloy tube filled with liquid CO2 and coated with a diamond-like carbon coating to reduce... To reduce friction between the PVC pipe sleeve and the casing, liquid CO2 is injected for heat absorption. The PVC pipe sleeve, discharged from the PVC extrusion mold 10, is pulled out and fitted onto the outer ring of the magnetic levitation tube 23. The outer ring of the PVC pipe sleeve is initially cooled by the water-cooling jacket 28, and the PVC pipe sleeve ring is initially cooled by the magnetic levitation tube 23. This achieves relatively uniform pre-cooling of the PVC pipe sleeve. After pre-cooling, it undergoes secondary cooling through the water-cooling assembly. The secondary cooling is a direct flushing cooling with cooling water. Since the PVC pipe sleeve comes into direct contact with cooling water after pre-cooling, it will not shrink.

[0031] In one embodiment of this invention, the water-cooling assembly includes a water storage tank 12 and a water pump 14. The water storage tank 12 is placed on a mounting base plate 5, and the water pump 14 is fixedly mounted on the mounting base plate 5 near the water storage tank 12. A water inlet pipe 15 is fixedly installed on the water inlet end of the water pump 14, and a water outlet pipe 13 is fixedly installed on the water outlet end of the water pump 14. The water inlet pipe 15 is connected to the water storage tank 12, and the water outlet pipe 13 is connected to the cooling tank 11. A water outlet pipe 16 is fixedly installed between the water storage tank 12 and the cooling tank 11, and water is discharged from the outlet. Pipe 16 is located at the bottom of cooling tank 11. The water pump 14 is started to draw cooling water from water storage tank 12 and pump it into cooling tank 11 through water injection pipe 13 to perform secondary cooling on the pre-cooled PVC pipe sleeve. The cooling water flows back to water storage tank 12 through water outlet pipe 16 to realize the recycling of cooling water. In this embodiment, the cooling water in water storage tank 12, water cooling jacket 28, and magnetic levitation pipe 23 need to be replaced regularly. This device is suitable for the preparation of the first and second insulation layers of wear-resistant and bend-resistant plastic power cords.

[0032] Working principle:

[0033] A mixture of PVC raw materials and nano-silica is added to the mixing chamber 8 through the first feed port 21. The second drive motor 20 is started to drive the agitator to stir the mixture. Then, the discharge port 24 is opened, and the mixture is injected into the extruder 6 through the second feed port 9. The first drive motor 7 is started to drive the screw conveyor 22 to rotate, and the mixture is fed into the PVC extrusion die 10 at a uniform speed. The PVC extrusion die 10 is existing technology. The PVC tube extruded through the extrusion shaft of the PVC extrusion die 10 enters the cooling box 11, where it undergoes two processes. After cooling, the water is discharged through the end of the cooling tank 11. Specifically, the outer ring of the PVC pipe sleeve is initially cooled by the water cooling jacket 28, and the PVC pipe sleeve ring is initially cooled by the magnetic levitation tube 23; thus achieving relatively uniform pre-cooling of the PVC pipe sleeve. After pre-cooling, secondary cooling is performed by the water cooling assembly. The water pump 14 is started to draw cooling water from the water storage tank 12 and pump it into the cooling tank 11 through the water injection pipe 13 to perform secondary cooling of the pre-cooled PVC pipe sleeve. The cooling water flows back to the water storage tank 12 through the water outlet pipe 16 to achieve the recycling of cooling water.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A wear-resistant and bend-resistant plastic power cord, characterized in that, It includes a conductor layer (1), a first insulating layer (2) is fixedly disposed on the outer layer of the conductor layer (1), a reinforcing layer (3) is fixedly wound around the outer ring of the first insulating layer (2), the reinforcing layer (3) is made of aramid fiber and spirally wound around the outside of the first insulating layer (2), and a second insulating layer (4) is fixedly disposed on the outside of the reinforcing layer (3).

2. The wear-resistant and bend-resistant plastic power cord according to claim 1, characterized in that, The conductor layer (1) is a multi-strand tin-plated copper wire stranded structure, and the first insulating layer (2) is made of modified PVC with 15-25% nano silica added.

3. The wear-resistant and bend-resistant plastic power cord according to claim 1, characterized in that, The second insulating layer (4) is made of TPU elastomer.

4. The wear-resistant and bend-resistant plastic power cord according to claim 1, characterized in that, The outer side of the second insulating layer (4) is coated with a protective coating, which is a UV-curable polyurethane coating.

5. A manufacturing equipment applicable to any one of claims 1-3 for a wear-resistant and bend-resistant plastic power cord, characterized in that, The system includes a mounting base plate (5), on which an extruder (6) is fixedly mounted. A mixing box (8) is fixedly mounted on the extruder (6). A first drive motor (7) is fixedly mounted at one end of the extruder (6), and a PVC extrusion mold (10) is fixedly connected at the other end. A cooling box (11) is fixedly connected to the PVC extrusion mold (10). A screw conveyor (22) connected to the first drive motor (7) is rotatably mounted inside the extruder (6). Baffles (27) are fixedly mounted at both ends of the cooling box (11). A water-cooling jacket (28) is fixedly mounted inside the baffles (27) near the PVC extrusion mold (10). A pair of suspension supports (26) are fixedly mounted inside the cooling box (11). A magnetic levitation tube (23) is suspended inside the suspension supports (26). A water-cooling component for secondary cooling is mounted on the side of the cooling box (11).

6. The manufacturing equipment for a wear-resistant and bend-resistant plastic power cord according to claim 5, characterized in that, The mounting base plate (5) is fixedly provided with a first bracket (17) and a second bracket (18); the extruder (6) is fixedly provided on the first bracket (17), the cooling box (11) is fixedly provided on the second bracket (18), the extruder (6) is fixedly provided with a third bracket (19), and the mixing box (8) is fixedly provided on the third bracket (19).

7. The manufacturing equipment for a wear-resistant and bend-resistant plastic power cord according to claim 5, characterized in that, A second drive motor (20) is fixedly installed on the mixing box (8), and a first feed port (21) is provided on the mixing box (8). The output shaft of the second drive motor (20) is fixedly connected to a stirring component, which is located inside the mixing box (8).

8. The manufacturing equipment for a wear-resistant and bend-resistant plastic power cord according to claim 7, characterized in that, A discharge port (25) is provided below the mixing box (8), and a second feed port (9) is provided above the extruder (6). The discharge port (25) is located directly above the second feed port (9), and a valve (24) is fixedly provided on the discharge port (25).

9. The manufacturing equipment for a wear-resistant and bend-resistant plastic power cord according to claim 5, characterized in that, The water-cooling assembly includes a water storage tank (12) and a water pump (14). The water storage tank (12) is placed on the mounting base plate (5). The water pump (14) is fixedly installed on the mounting base plate (5) on one side close to the water storage tank (12). A water pump pipe (15) is fixedly installed at the water inlet end of the water pump (14). A water injection pipe (13) is fixedly installed at the water outlet end of the water pump (14). The water pump pipe (15) is connected to the water storage tank (12), and the water injection pipe (13) is connected to the cooling tank (11).

10. The manufacturing equipment for a wear-resistant and bend-resistant plastic power cord according to claim 9, characterized in that, A water outlet pipe (16) is fixedly installed between the water storage tank (12) and the cooling tank (11).

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