Repair tool for high-voltage cable

Abstract

The utility model discloses a repairing tool for a high-voltage cable, which comprises a repairing shell and an extrusion molding gun, two annular sealing grooves are arranged in the repairing shell along the axial direction, a repairing area is arranged between the two sealing grooves, sealing rings are arranged in the sealing grooves, a material injection port is arranged at the upper end of the repairing shell, the material injection port is arranged between the two sealing grooves, and the extrusion molding gun is arranged in the repairing shell. The extrusion molding gun is provided with an extrusion molding outlet in threaded connection with the injection port, the extrusion molding outlet is formed in one end of the extrusion molding gun, the other end of the extrusion molding gun is provided with a feeding port used for placing extrusion molding material particles, and the axis of the extrusion molding gun is provided with a pushing screw used for pushing the extrusion molding material from the feeding port to the extrusion molding outlet. And the extruded material particles are converted from a solid state to a liquid state in the feeding process and then are injected into the injection port. The utility model provides a repairing tool for a high-voltage cable, which can eliminate bubbles in a protective layer formed by repairing.

Description

Technical Field

[0001] The utility model relates to the field of cable repair, in particular to a repair tool for high-voltage cables. Background Art

[0002] During long-term use of the cable, if the cable is damaged due to high-voltage breakdown or environmental factors, or if the length of the cable is less than the required length of the cable, and the cable needs to be continued, the surface layer of the cable needs to be peeled off first, and then the conductors of the cable are connected, and then the insulating layer, molded protective layer and other structures are wrapped on the surface of the conductor to ensure the insulation and sealing of the cable to comply with electrical insulation regulations.

[0003] The traditional protective layer structure will wrap the cable area to be repaired with a repair tooling mold, and then directly inject liquid protective layer material into the repair tooling mold through a pressure extrusion gun, and then wait for the protective layer material to solidify and take shape. However, if there are bubbles in the liquid protective layer material injected by simple pressure extrusion, the bubbles cannot be eliminated after solidification, thereby affecting the strength of the protective layer and being detrimental to the long-term use of the protective layer. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a repair tool for high-voltage cables which can eliminate bubbles in a protective layer formed by repair.

[0005] The technical solution adopted by the utility model to solve the above-mentioned problems is: a repair tool for high-voltage cables, comprising a repair shell for covering the repair area and an extrusion gun for injecting cable outer layer repair material into the repair shell, two annular sealing grooves are arranged in the repair shell along the axial direction, the repair area is arranged between the two sealing grooves, a sealing ring is arranged in the sealing groove, an injection port is arranged at the upper end of the repair shell, the injection port is arranged between the two sealing grooves, an extrusion outlet threadedly connected to the injection port is arranged on the extrusion gun, the extrusion outlet is arranged at one end of the extrusion gun, a feed port for placing extruded material particles is arranged at the other end of the extrusion gun, a pushing screw for pushing the extruded material from the feed port to the extrusion outlet is arranged on the axis of the extrusion gun, and the extruded material particles are injected into the injection port after completing the transformation from solid state to liquid state during the feeding process.

[0006] Compared with the prior art, the utility model has the following advantages: in the extrusion process, the extrusion is carried out by means of screw pushing. Compared with the pressure extrusion method, under the condition of the same driving power, although the screw pushing method increases the extrusion stroke, the extrusion force is increased, so that a higher density protective layer can be formed in the repair shell, thereby increasing the strength of the protective layer; at the same time, in the pressure extrusion method, the protective layer materials are in a relatively static state, and the existing bubbles are difficult to eliminate inside the protective layer, while through the spiral propulsion method of the pushing screw, the protective layer material can be continuously turned over, thereby continuously exposing the bubbles in the protective layer material and eliminating them, thereby protecting the protective layer. The first step is to ensure the quality of the formed protective layer; the second step is to choose the material of the protective layer. Due to the limitations of the environmental conditions for repair, traditional protective layer materials are mostly made of rubber that is liquid at room temperature and then slowly solidifies after contact with oxygen. The solidification period is long and it is easy to deform. The utility model uses solid particles at room temperature to melt in an extrusion gun and then forms a protective layer for repair. The solidification period of the protective layer will be greatly shortened, the repair efficiency will be improved, and it will not be easy to deform. Among other technical features, the design of the sealing groove and the sealing ring can ensure the stability and sealing of the protective layer formation area, and avoid the leakage of the protective layer material during the extrusion process.

[0007] As an improvement of the utility model, the repair shell is formed by splicing two repair half shells, and the connection between the two repair half shells is fixed by fastening screws. Through the improvement, the repair shell is formed by splicing two repair half shells, which is more suitable for repairing cables. The cable can be directly wrapped radially to complete the repair without the need to insert the cable from the end for repair.

[0008] As an improvement of the present invention, an expansion gap is provided on the outer side of the repair half shell. Through the improvement, in order to ensure high-quality repair of the protective layer, the thickness of the protective layer after molding should be the same as the thickness of the original protective layer of the high-voltage cable. Therefore, the inner diameter of the repair shell should be the same as the original protective layer. However, due to the design requirements of the sealing ring, the repair shell will expand outward. Therefore, the expansion gap is designed to provide space for the repair half shell to expand and deform, so as to avoid the situation where the two repair half shells cannot be closed due to the resistance of the sealing ring when splicing the two repair half shells.

[0009] As an improvement of the present invention, the repair shell is made of heat-conducting material, and a plurality of heating elements for heating the repair shell are arranged on the outer circumference of the repair shell. Through the improvement, not only the original protective layer can be heated, which helps the adhesion of the original protective layer and the new protective layer, but also the environment inside the repair shell can be preheated to avoid the injected protective layer material from solidifying prematurely.

[0010] As an improvement of the utility model, the injection port is provided with an external thread, and the extrusion outlet is rotatably connected to an internal threaded sleeve threadedly connected to the injection port. Through the improvement, a fixed connection between the injection port and the extrusion outlet is achieved, ensuring the stability of the protection layer material transportation.

[0011] As an improvement of the utility model, the extrusion outlet includes an outlet pipe, the outlet end of the outlet pipe is provided with a rotating flange which is sealingly and rotatably connected to the internal threaded sleeve, the inner diameter of the internal threaded sleeve is larger than the inner diameter of the outlet pipe, and a one-way exhaust valve is provided on the rotating flange. Through the improvement, the rotational connection between the internal threaded sleeve and the extrusion outlet is realized through the design of the rotating flange, and the design that the inner diameter of the internal threaded sleeve is larger than the inner diameter of the outlet pipe can move the original air in the repair shell toward the internal threaded sleeve when the protective layer material is injected into the repair shell, and then the air is discharged through the one-way exhaust valve to ensure high-quality molding of the protective layer.

[0012] As an improvement of the present invention, the extrusion gun includes an inner tube wall and an outer tube wall, the inner tube wall is made of heat-conducting material, the outer tube wall is made of heat-insulating material, heat-insulating cotton is arranged between the inner tube wall and the outer tube wall, and the inner tube wall is provided with a plurality of heating elements for heating the inner tube wall. Through the improvement, the extrusion gun is heated to achieve the conversion of the protective layer material from a granular solid state to a liquid state. At the same time, the design of the heat-insulating material of the outer tube wall and the heat-insulating cotton can avoid scalding the staff.

[0013] As an improvement of the utility model, a handle and a control system connecting seat are provided at the bottom end of the extrusion gun. Through the improvement, the handle can be held with one hand and the control system connecting seat can be supported with the other hand, so that handheld extrusion work can be realized, which is suitable for outdoor unsupported environments.

[0014] As an improvement of the present invention, the bottom end of the handle is threadedly connected to a height adjustment rod, and the bottom end of the control system connecting seat is threadedly connected to a height adjustment seat. Through the improvement, the length of the handle and the height of the control system connecting seat can be adjusted, so that the extrusion gun can be adaptably fixed in some relatively flat supporting environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0016] Figure 2 It is a schematic diagram of the repair shell structure of the utility model.

[0017] Figure 3 It is a schematic diagram of the cross-sectional structure of the repair shell of the utility model along the connecting surface of the repair half shells.

[0018] Figure 4 The utility model is a schematic diagram of the cross-sectional structure of an extrusion gun.

[0019] Figure 5 It is a schematic diagram of the cross-sectional structure of the inner tube wall and the outer tube wall of the utility model.

[0020] As shown in the figure: 1. Repair shell, 1.1. Sealing groove, 1.2. Sealing ring, 1.3. Injection port, 1.4. Repair half shell, 1.5. Expansion gap, 2. Extrusion gun, 2.1. Extrusion outlet, 2.1.1. Outlet pipe, 2.1.2. Rotating flange, 2.1.3. One-way exhaust valve, 2.2. Feed inlet, 2.3. Push screw, 2.4. Internal threaded sleeve, 2.5. Inner pipe wall, 2.6. Outer pipe wall, 2.7. Insulation cotton, 2.8. Handle, 2.8.1. Height adjustment rod, 2.8.2. Self-locking nut, 2.9. Control system connecting seat, 2.9.1. Height adjustment seat, 3. Heating element. DETAILED DESCRIPTION

[0021] The embodiments of the present utility model are further described below in conjunction with the accompanying drawings.

[0022] like Figure 1 As shown, a repair tool for high-voltage cables comprises a repair shell 1 for covering the repair area and an extrusion gun 2 for injecting cable outer layer repair material into the repair shell 1. Two annular sealing grooves 1.1 are arranged in the repair shell 1 along the axial direction, and the repair area is arranged between the two sealing grooves 1.1. A sealing ring 1.2 is arranged in the sealing groove 1.1. The sealing ring 1.2 is formed by a sealing strip wrapped around the outer layer of the cable, and then heated and fixed into a ring at the ends. An injection port 1.3 is arranged at the upper end of the repair shell 1. 3 is arranged between the two sealing grooves 1.1, the extrusion gun 2 is provided with an extrusion outlet 2.1 threadedly connected with the injection port 1.3, the extrusion outlet 2.1 is arranged at one end of the extrusion gun 2, the other end of the extrusion gun 2 is provided with a feed port 2.2 for placing extrusion material particles, and the axis of the extrusion gun 2 is provided with a push screw 2.3 for pushing the extrusion material from the feed port 2.2 to the extrusion outlet 2.1. The extrusion material particles are injected into the injection port 1.3 after completing the transformation from the solid state of the particles to the liquid state during the feeding process.

[0023] like Figure 2 , Figure 3 As shown, the repair shell 1 is formed by splicing two repair half shells 1.4, and the connection between the two repair half shells 1.4 is fixed by fastening screws. The outer side of the repair half shell 1.4 is provided with an expansion gap 1.5. The repair shell 1 is made of heat-conducting material, and a plurality of heating elements 3 for heating the repair shell 1 are provided on the outer circumference of the repair shell 1.

[0024] like Figure 2-4As shown, the injection port 1.3 is provided with an external thread, the extrusion outlet 2.1 is rotatably connected to an internal threaded sleeve 2.4 threadedly connected to the injection port 1.3, the extrusion outlet 2.1 includes an outlet pipe 2.1.1, the outlet end of the outlet pipe 2.1.1 is provided with a rotating flange 2.1.2 sealed and rotatably connected to the internal threaded sleeve 2.4, the side wall of the rotating flange 2.1.2 is rotatably and tightly connected to the inner wall of the internal threaded sleeve 2.4, the inner diameter of the internal threaded sleeve 2.4 is larger than the inner diameter of the outlet pipe 2.1.1, and a one-way exhaust valve 2.1.3 is provided on the rotating flange 2.1.2.

[0025] like Figure 5 As shown, the extrusion gun 2 includes an inner tube wall 2.5 and an outer tube wall 2.6, the inner tube wall 2.5 is made of heat-conducting material, the outer tube wall 2.6 is made of heat-insulating material, heat-insulating cotton 2.7 is arranged between the inner tube wall 2.5 and the outer tube wall 2.6, and a plurality of heating elements 3 for heating the inner tube wall 2.5 are arranged on the inner tube wall 2.5.

[0026] A motor for driving the pushing screw 2.3 to rotate is provided at one end of the pushing screw 2.3. During the pushing and rotating process, the extruded material will be continuously turned over, and because the heating element 3 on the inner tube wall 2.5 is heated, the extruded material particles will be continuously melted, so that the anti-extrusion material can be melted more evenly and stably during the pushing process, and the bubbles in the extruded material can be discharged in time to ensure the extrusion quality of the extruded material.

[0027] like Figure 4As shown, the bottom end of the extrusion gun 2 is provided with a handle 2.8 and a control system connection seat 2.9, the bottom end of the handle 2.8 is threadedly connected to a height adjustment rod 2.8.1, and the bottom end of the control system connection seat 2.9 is damped and movablely connected to a height adjustment seat 2.9.1. A self-locking nut 2.8.2 is provided between the height adjustment rod 2.8.1 and the handle 2.8. After the height adjustment rod 2.8.1 is adjusted to a specified height, the self-locking nut 2.8.2 is moved to abut against the bottom end of the handle 2.8, so that the thread self-locking can be formed to prevent the height adjustment rod 2.8.1 and the handle 2.8 from rotating relative to each other during the use of the extrusion gun 2. Two movable connecting rods are arranged at one end of the height adjustment seat 2.9. The two movable connecting rods and the control system connection seat 2.9 are fixed in a high friction damping manner, and the friction damping can prevent the movable connecting rods and the control system connection seat 2.9 from moving relative to each other only under the influence of the gravity of the extrusion gun 2. At the same time, during use, the bottom end of the handle 2.8 and the control system connection seat 2.9 are often much higher than the ground. If the handheld extrusion gun 2 is not used for the extrusion process, a temporary base can be made to support the handle 2.8 and the control system connection seat 2.9, and then the support and contact state between the handle 2.8 and the base can be fine-tuned by the height adjustment rod 2.8.1, and the support and contact state between the control system connection seat 2.9 and the base can be fine-tuned by the height adjustment seat 2.9.1.

[0028] A plurality of control components are arranged in the control system connection seat 2.9, which are used to control the pushing speed of the pushing screw 2.3 and the heating temperature of the heating element 3 on the inner tube wall 2.5.

[0029] The heating element 3 on the inner tube wall 2.5 and the heating element 3 on the repair shell 1 are both conventional technologies and can be heated by just turning on electricity.

[0030] The above description is only for the best embodiment of the utility model, but it cannot be understood as a limitation of the claims. The utility model is not limited to the above embodiments, and its specific structure is allowed to be changed. All changes made within the protection scope of the independent claims of the utility model are within the protection scope of the utility model.

Claims

1. A repair tool for high voltage cables, characterized in that: The invention comprises a repair shell (1) for covering a repair area and an extrusion gun (2) for injecting a cable outer layer repair material into the repair shell (1), wherein two annular sealing grooves (1.1) are arranged in the repair shell (1) along the axial direction, the repair area is arranged between the two sealing grooves (1.1), a sealing ring (1.2) is arranged in the sealing groove (1.1), an injection port (1.3) is arranged at the upper end of the repair shell (1), and the injection port (1.3) is arranged between the two sealing grooves (1.1), and an injection port (1.3) is arranged on the upper end of the extrusion gun (2). An extrusion outlet (2.1) threadedly connected to an injection port (1.3) is provided, the extrusion outlet (2.1) being arranged at one end of an extrusion gun (2), the other end of the extrusion gun (2) being provided with a feed port (2.2) for placing extrusion material particles, a push screw (2.3) for pushing the extrusion material from the feed port (2.2) to the extrusion outlet (2.1) is provided on the axis of the extrusion gun (2), and the extrusion material particles are injected into the injection port (1.3) after completing the transformation from a solid state to a liquid state during the feeding process.

2. A repair tool for high voltage cables according to claim 1, characterized in that: The repair shell (1) is formed by splicing two repair half shells (1.4), and the connection between the two repair half shells (1.4) is fixedly connected by fastening screws.

3. A repair tool for high voltage cables according to claim 2, characterized in that: An expansion gap (1.5) is provided on the outer side surface of the repair half shell (1.4).

4. The repair tool for high voltage cables according to claim 1, characterized in that: The repair shell (1) is made of a heat-conducting material, and a plurality of heating elements (3) for heating the repair shell (1) are provided on the outer circumference of the repair shell (1).

5. The repair tool for high voltage cables according to claim 1, characterized in that: The injection port (1.3) is provided with an external thread, and the extrusion outlet (2.1) is rotatably connected to an internal thread sleeve (2.4) threadably connected to the injection port (1.3).

6. A repair tool for high voltage cables according to claim 5, characterized in that: The extrusion outlet (2.1) comprises an outlet pipe (2.1.1), the outlet end of which is provided with a rotating flange (2.1.2) which is sealingly and rotatably connected to an internal threaded sleeve (2.4), the inner diameter of which is larger than that of the outlet pipe (2.1.1). 2.1.1), and a one-way exhaust valve (2.1.3) is provided on the rotating flange (2.1.2).

7. The repair tool for high voltage cables according to claim 1, characterized in that: The extrusion gun (2) comprises an inner tube wall (2.5) and an outer tube wall (2.6); the inner tube wall (2.5) is made of a heat-conducting material, the outer tube wall (2.6) is made of a heat-insulating material, heat-insulating cotton (2.7) is provided between the inner tube wall (2.5) and the outer tube wall (2.6), and a plurality of heating elements (3) for heating the inner tube wall (2.5) are provided on the inner tube wall (2.5).

8. The repair tool for high voltage cables according to claim 1, characterized in that: The bottom end of the extrusion gun (2) is provided with a handle (2.8) and a control system connection seat (2.9).

9. A repair tool for high voltage cables according to claim 8, characterized in that: The bottom end of the handle (2.8) is threadedly connected to a height adjustment rod (2.8.1), and the bottom end of the control system connection seat (2.9) is damped and movably connected to a height adjustment seat (2.9.1).

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