High-low voltage cable branch box with insulation repair structure

Abstract

The invention discloses a high-low voltage cable branch box with an insulation repair structure, and relates to the technical field of cable branch boxes, and the high-low voltage cable branch box comprises a cabinet body and a cable passing through the bottom of the cabinet body; the sealing rubber is arranged on the inner side of the cabinet body and is used for sealing and isolating the cable and the cabinet body to form an insulation protection state; and the sealing repairer is positioned in the cabinet body and is used for repairing the sealing rubber with the sealing protection failure. Through mutual cooperation of the sealing repairing device and the digging assembly, when sealing leakage occurs to sealing rubber, local part can be dug and filled with repairing liquid, so that the sealing rubber is subjected to sealing operation again under the cooperation of the repairing liquid; therefore, insulation failure caused by exposure of insulation parts in the cabinet body in external medium environments such as rainwater, dust, moisture and the like due to sealing leakage of the sealing rubber is avoided, and the overall sealing performance of the device is improved.

Description

Technical Field

[0001] This invention relates to the field of cable branch box technology, specifically a high- and low-voltage cable branch box with an insulation repair structure. Background Technology

[0002] High and low voltage cable distribution boxes are core equipment in power distribution systems used for branching, connecting, and distributing electrical energy from cable lines. They primarily solve the problem of "the main cable cannot directly supply power to multiple load points," enabling "one input and multiple outputs" or "multiple inputs and multiple outputs" power distribution functions. Their core value lies in simplifying the power distribution network, reducing cable laying, lowering power distribution costs, and simultaneously ensuring the safety and reliability of power transmission.

[0003] In actual operation and maintenance, existing high and low voltage cable distribution boxes, because cables need to pass through the bottom of the box and rely on sealant to achieve sealing and isolation between the cable and the box, are prone to the core technical problem of "seal failure leading to insulation degradation, and lack of targeted automated insulation repair methods" after long-term use. The specific manifestations are as follows:

[0004] 1. The bottom sealant is prone to cracking and damage after long-term use, directly leading to seal failure and allowing harmful external media to enter. The existing branch box bottom cable connection area seal relies on a single sealant (such as silicone sealant or polyurethane sealant). Over time, it is affected by environmental temperature changes (temperature difference between day and night causing thermal expansion and contraction of the sealant layer), slight cable vibration (displacement caused by thermal expansion and contraction of the cable during operation), and harsh outdoor environment (rain erosion, salt spray corrosion, dust accumulation). The sealant is prone to cracking, shrinkage, and peeling from the substrate, leading to bottom seal failure. After failure, rainwater, dust, moisture and other external media can enter the inner cavity of the box along the gap between the cable and the box, creating hidden dangers for subsequent insulation deterioration.

[0005] 2. External media intrusion can cause deterioration of internal insulation components, leading to decreased insulation performance or even insulation failure, thus inducing safety malfunctions. The intrusion of rainwater and moisture through the bottom seal can directly affect critical insulation components inside the enclosure: For high-voltage branch boxes, this can cause moisture absorption in the cable joint insulation layer (heat-shrink / cold-shrink tubing), surface creepage on insulators, and moisture absorption in the SF6 gas insulation chamber (if it is a gas-insulated type), resulting in a sharp drop in insulation resistance (from the acceptable value ≥1000MΩ to <100MΩ), which in severe cases can lead to insulation breakdown, arc discharge, or even phase-to-phase short circuits; For low-voltage branch boxes, this can cause damage to the cable outer sheath insulation, moisture absorption in the busbar insulation partition, and malfunction of the leakage current protection device, resulting in a drop in insulation resistance (from the acceptable value ≥500MΩ to <50MΩ), causing the enclosure to become energized and the leakage current to trip, threatening personal safety and the continuity of power supply to the terminal loads.

[0006] To address this issue, we provide a high- and low-voltage cable branch box with an insulation repair structure. Summary of the Invention

[0007] The purpose of this invention is to address the problem that cables need to be inserted from the bottom of the box and rely on sealant to achieve a seal between the cable and the box, which is prone to "seal failure leading to insulation deterioration" after long-term use. This invention provides a high and low voltage cable branch box with an insulation repair structure.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a high- and low-voltage cable branch box with an insulation repair structure, comprising: a cabinet and a cable passing through the bottom of the cabinet; and a sealing rubber installed inside the cabinet to seal and isolate the cable from the cabinet, forming an insulation protection state; a sealing repair device located inside the cabinet for repairing the sealing rubber that has failed to provide sealing protection, the sealing repair device comprising: a connecting cover fixedly connected inside the cabinet, the inner side of the connecting cover being provided with a digging component for digging out the damaged sealing rubber, and cooperating with the sealing repair device to achieve sealing repair; and a stepped pressing auxiliary component located inside the connecting cover for pressing down the filled repair fluid, the stepped pressing auxiliary component comprising: three stepped pressing blocks disposed above the sealing rubber, the three stepped pressing blocks being slidably connected to each other in pairs.

[0009] As a further embodiment of the present invention: the excavation assembly includes a connecting plate disposed inside the connecting cover, an excavation blade disposed at the bottom of the connecting plate, an electric push rod for driving the excavation blade to move downwards mounted on the top of the connecting plate, and a collection bin for collecting waste material is provided inside the connecting cover.

[0010] As a further embodiment of the present invention: the excavation assembly further includes a spur gear ring rotatably connected to the inner side of the connecting cover, a drive motor is installed on the top of the connecting cover, and the output end of the drive motor passes through the inner side of the connecting cover and is fixedly connected to a spur gear that meshes with the spur gear ring, a suspension shell is fixedly connected to the bottom of the spur gear ring, and a guide rod is slidably connected to the inner side of the suspension shell, and the bottom of the guide rod is fixedly connected to the connecting plate.

[0011] As a further embodiment of the present invention: the sealing repair device further includes a second rectangular slide rod slidably connected to the inner side of the connecting plate, a second auxiliary spring is installed between the second rectangular slide rod and the connecting plate, the bottom of the second rectangular slide rod extends through to the bottom of the connecting plate and is fixedly connected to a flow guide shell, a hydraulic cylinder for driving the connecting plate to move longitudinally is installed on one side of the suspension shell, and a quantitative feeding assembly is provided between the flow guide shell and the connecting cover.

[0012] As a further embodiment of the present invention: the quantitative feeding assembly includes a rotating cover rotatably connected to the inside of the connecting cover, a storage box fixedly connected to one side of the rotating cover, the storage box being fixedly connected to the spur gear ring via a suspension seat, a piston block being slidably connected to the inside of the storage box, a connecting spring being installed between the piston block and the storage box, a first one-way valve being installed at the inlet of the storage box, and one end of the first one-way valve penetrating into the interior of the connecting cover, a second one-way valve being fixedly connected to the outlet of the storage box, and the second one-way valve communicating with the guide shell via a connecting hose.

[0013] As a further embodiment of the present invention: the quantitative feeding assembly further includes a spherical rod fixedly connected to the top of the piston block, a drive ring fixedly connected to the inner side of the connecting cover, a spiral inclined surface provided at the bottom of the drive ring, and a plane provided between the lowest point and the highest point of the spiral inclined surface, and the plane is parallel to the lowest point of the spiral inclined surface.

[0014] As a further embodiment of the present invention: the stepped clamping auxiliary assembly includes a first rectangular slide rod fixedly connected to the top of each clamping block, one end of the first rectangular slide rod extending through to the top of the connecting plate and slidably connected to the connecting plate, and a first auxiliary spring installed between the connecting plate and the first rectangular slide rod.

[0015] As a further embodiment of the present invention: the three clamping blocks are combined with the flow guide shell in a stepped clamping shape, and the inner side of the clamping blocks is provided with a slope.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. By setting up a seal repairer and a digging component to work together, when the sealing rubber leaks, the local area can be dug out and filled with repair fluid. This allows the sealing rubber to be resealed with the help of the repair fluid, thus preventing the insulation components inside the cabinet from being exposed to external media such as rainwater, dust, and moisture due to sealing rubber leakage, which could lead to insulation failure. This improves the overall sealing performance of the device.

[0018] 2. By setting up the cooperation of components such as the clamping blocks, when the guide shell discharges the repair fluid, the clamping blocks, which are assembled into a stepped structure, can squeeze the filled repair fluid in a stepped manner. After the repair fluid is discharged through the guide shell, it is easy to mix in tiny air bubbles in the initial filling state (such as air introduced during glue supply, or air bubbles formed by moisture on the cable surface). If it is cured naturally by gravity alone, the air bubbles will form "leakage channels" in the glue layer. However, the stepped clamping can completely remove the air bubbles by "gradually increasing pressure", thereby improving the repair and sealing effect.

[0019] 3. By setting up components such as spherical rods, when the connecting plate drives the storage box to rotate circumferentially, the spherical rods are gradually squeezed along the "spiral inclined plane" at the bottom of the drive ring, pushing the piston block, compressing the connecting spring, and the "progressive squeezing" design of the spiral inclined plane. This allows the repair fluid to be squeezed out from the second one-way valve at a uniform speed (rather than gushing out instantly), and the amount squeezed out is precisely matched with the height difference of the inclined plane (such as squeezing out a fixed amount per degree of rotation), ensuring that "the excavated annular groove is completely filled without any local lack of glue, thereby improving the filling effect of the repair fluid." Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a cross-sectional view of the present invention;

[0022] Figure 3 This is a schematic diagram of the inner structure of the connecting cover of the present invention;

[0023] Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle;

[0024] Figure 5 This is a schematic diagram of the bottom structure of the spur gear ring of the present invention;

[0025] Figure 6 This is a schematic diagram of the bottom structure of the connecting plate of the present invention;

[0026] Figure 7 This is a schematic diagram of the clamping block structure of the present invention;

[0027] Figure 8 This is a cross-sectional view of the flow guide shell of the present invention;

[0028] Figure 9 This is a schematic diagram of the excavation blade structure of the present invention.

[0029] In the diagram: 1. Cabinet; 2. Cable; 3. Sealing rubber; 4. Connecting cover; 5. Rotating cover; 6. Collection bin; 7. Drive motor; 8. Spur gear ring; 9. Drive ring; 10. First check valve; 11. Storage box; 12. Flow guide shell; 13. Second check valve; 14. Connecting hose; 15. Connecting spring; 16. Suspension shell; 17. Guide rod; 18. Hydraulic cylinder; 19. Spur gear; 20. Suspension seat; 21. Piston block; 22. Connecting plate; 23. Digging blade; 24. Ball rod; 25. Clamping block; 26. First rectangular slide rod; 27. Second rectangular slide rod; 28. First auxiliary spring; 29. ​​Second auxiliary spring. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0031] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" 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 of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0032] Please see Figures 1-9This embodiment provides a high- and low-voltage cable branch box with an insulation repair structure, including: a cabinet 1 and a cable 2 passing through the bottom of the cabinet 1; and a sealing rubber 3 installed inside the cabinet 1 to seal and isolate the cable 2 from the cabinet 1 to form an insulation protection state; and a sealing repair device located inside the cabinet 1 for repairing the sealing rubber 3 when the sealing protection fails. The sealing repair device includes: a connecting cover 4 fixedly connected inside the cabinet 1, and a digging component provided inside the connecting cover 4 for digging out the damaged sealing rubber 3, which works in conjunction with the sealing repair device to achieve sealing repair. The digging component includes a connecting plate 22 provided inside the connecting cover 4. A digging blade 23 is provided at the bottom of the connecting plate 22, and an electric push rod for driving the digging blade 23 to move downward is installed at the top of the connecting plate 22. A collection chamber 6 for collecting waste is provided inside the connecting cover 4. The digging assembly also includes a spur gear ring 8 rotatably connected to the inside of the connecting cover 4. A drive motor 7 is installed at the top of the connecting cover 4, and the output end of the drive motor 7 extends through to the inside of the connecting cover 4 and is fixedly connected to a spur gear 19 that meshes with the spur gear ring 8. A suspension shell 16 is fixedly connected to the bottom of the spur gear ring 8, and a guide rod 17 is slidably connected to the inside of the suspension shell 16. The bottom of the guide rod 17 is fixedly connected to the connecting plate 22. The sealing repair device also includes... The system includes a second rectangular slide rod 27 slidably connected to the inner side of the connecting plate 22. A second auxiliary spring 29 is installed between the second rectangular slide rod 27 and the connecting plate 22. The bottom of the second rectangular slide rod 27 extends through to the bottom of the connecting plate 22 and is fixedly connected to a guide shell 12. A hydraulic cylinder 18 for driving the connecting plate 22 to move longitudinally is installed on one side of the suspension shell 16. A quantitative feeding assembly is provided between the guide shell 12 and the connecting cover 4. The quantitative feeding assembly includes a rotating cover 5 rotatably connected to the inner side of the connecting cover 4. A storage box 11 is fixedly connected to one side of the rotating cover 5. The storage box 11 is fixedly connected to the spur gear ring 8 through a suspension seat 20. The inner side of the storage box 11 is slidably connected to... There is a piston block 21, and a connecting spring 15 is installed between the piston block 21 and the storage box 11. A first one-way valve 10 is installed at the inlet of the storage box 11, and one end of the first one-way valve 10 extends into the interior of the connecting cover 4. A second one-way valve 13 is fixedly connected at the outlet of the storage box 11, and the second one-way valve 13 is connected to the guide shell 12 through the connecting hose 14. The quantitative feeding assembly also includes a ball rod 24 fixedly connected to the top of the piston block 21. A drive ring 9 is fixedly connected to the inner side of the connecting cover 4. A spiral inclined surface is provided at the bottom of the drive ring 9, and a plane is provided between the lowest point and the highest point of the spiral inclined surface, and the plane is parallel to the lowest point of the spiral inclined surface.

[0033] First, the sealing rubber 3 is initially attached to the outer wall of the cable 2. A sensor for detecting moisture is installed on the inner side of the connecting cover 4. When moisture is detected flowing from inside the connecting cover 4 to the outside, the signal is transmitted to the PLC controller. The PLC controller starts the hydraulic cylinder 18, which drives the connecting plate 22 to move downward, so that the digging blade 23 is inserted into the sealing rubber 3. Then, the drive motor 7 is started. The output end of the drive motor 7 drives the spur gear 19 to rotate in a circle, thereby driving the spur gear ring 8 to drive the digging blade 23 to rotate in a circle, thereby digging in a circle on the top of the sealing rubber 3. The excavated waste is collected through the collection bin 6.

[0034] The connecting cover 4 is filled with repair fluid, which can be a sealing adhesive or other materials. After the digging blade 23 digs the waste around the circumference, the digging blade 23 is reset under the drive of the electric push rod (so that the bottom of the digging blade 23 is away from the bottom of the guide shell 12). Then, during the circumferential rotation of the connecting plate 22, the ball rod 24 is gradually squeezed along the spiral inclined surface at the bottom of the drive ring 9, so that the repair fluid stored inside the guide shell 12 can be gradually squeezed out from the second one-way valve 13 and discharged through the guide shell 12 to the dug-out part. The repair fluid can repair the gap between the cable 2 and the sealing rubber 3. The above circumferential rotation can be stopped after two rotations.

[0035] When the ball rod 24 rotates to the initial position, the piston block 21 is reset under the action of the connecting spring 15, so that the repair fluid stored inside the connecting cover 4 can be drawn into the storage box 11 through the first one-way valve 10, so as to facilitate the next repair operation.

[0036] The sealing rubber 3 initially adheres to the outer wall of the cable 2. When the sealing rubber 3 develops tiny gaps (such as 0.5-1mm) due to aging or cracking, external moisture will first penetrate into the interior of the connecting cover 4 (instead of directly entering the cabinet 1). At this time, the moisture sensor can accurately detect the "sudden increase in local moisture concentration" and trigger the PLC to start repair, preventing moisture from further invading the interior of the cabinet. The above operation steps are existing technology, so they are not described in detail in this solution.

[0037] Traditional manual inspections rely on visual inspection of whether water has accumulated in the cabinet. This is often only discovered after the seal has failed, causing water to enter the cabinet and the cable sheath / joints to become damp. This solution, however, can intervene in the early stage when moisture has only seeped in and has not yet formed water accumulation. It can completely cut off the chain of faults of "moisture → decreased insulation resistance → leakage → tripping" and protect the internal insulation system of the cabinet (such as busbars and insulators) from moisture.

[0038] The drive motor 7 drives the digging blade 23 to rotate around the annular sealing surface of the cable 2-sealing rubber 3 via the spur gear 19 and spur gear ring 8. At the same time, the hydraulic cylinder 18 drives the digging blade to insert downwards. This design can accurately remove the annular area of ​​the failed sealing rubber (rather than partial digging), avoiding the problem of "residual failed rubber causing poor adhesion of the repair fluid". For example, if the sealing rubber has an annular gap due to shrinkage, the digging will form a "regular annular groove", providing uniform space for subsequent filling of the repair fluid.

[0039] When the connecting plate 22 drives the storage box 11 to rotate, the ball rod 24 is gradually squeezed along the "spiral slope" at the bottom of the drive ring 9, pushing the piston block 21 to compress the connecting spring 15. The "progressive squeezing" design of the spiral slope allows the repair fluid to be squeezed out from the second one-way valve 13 at a uniform speed (instead of gushing out instantly), and the amount squeezed out is precisely matched with the height difference of the slope (such as squeezing out a fixed amount for every 1° of rotation), ensuring that "the excavated annular groove is completely filled without any local lack of glue".

[0040] Circular adhesive supply + two-circle rotation: ensuring no dead corners: the repair fluid is discharged through the guide shell 12 and rotates in two circles - the first circle is for initial filling and the second circle is for supplementary coverage, avoiding "local missed coating due to slight cable eccentricity", and finally forming a complete annular sealing band of "cable 2 - sealing rubber 3 - repair fluid", completely blocking the moisture penetration path.

[0041] Please see Figures 6-7 The stepped clamping auxiliary component, located inside the connecting cover 4, is used to press down the filled repair fluid. The stepped clamping auxiliary component includes three stepped clamping blocks 25 disposed above the sealing rubber 3. The three stepped clamping blocks 25 are slidably connected to each other in pairs. The stepped clamping auxiliary component includes a first rectangular slide rod 26 fixedly connected to the top of each clamping block 25. One end of the first rectangular slide rod 26 extends through to the top of the connecting plate 22 and is slidably connected to the connecting plate 22. A first auxiliary spring 28 is installed between the connecting plate 22 and the first rectangular slide rod 26. The three clamping blocks 25 and the guide shell 12 are combined to form a stepped clamping shape, and the inner side of the clamping blocks 25 is provided with a slope.

[0042] As the connecting plate 22 moves downward, it drives the guide shell 12 and multiple clamping blocks 25 to move downward. When the guide shell 12 and multiple clamping blocks 25 encounter resistance, they can automatically retract under the action of the first auxiliary spring 28 and the second auxiliary spring 29, until they move to the place after the waste has been dug out. When the digging blade 23 rotates once, it is reset under the drive of the electric push rod. At this time, the spur gear ring 8 rotates once more to perform the filling operation.

[0043] When the guide shell 12 discharges the repair fluid, the filling repair fluid can be squeezed in a step-by-step manner by the stepped clamping blocks 25. After the repair fluid is discharged through the guide shell, it is easy to mix in tiny air bubbles in the initial filling state (such as air introduced during glue supply, or air bubbles formed by moisture on the cable surface). If it is cured naturally by gravity alone, the air bubbles will form "leakage channels" in the glue layer. However, the stepped clamping can completely remove the air bubbles by "gradually increasing pressure", thereby improving the repair and sealing effect.

[0044] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high- and low-voltage cable branch box with an insulation repair structure, characterized in that, include: Cabinet (1) and cable (2) passing through the bottom of said cabinet (1); And a sealing rubber (3) installed inside the cabinet (1) to seal and isolate the cable (2) from the cabinet (1) to form an insulating protective state. A seal repair device, located inside the cabinet (1), is used to repair the sealing rubber (3) that has failed in its sealing protection function. The seal repair device includes: A connecting cover (4) is fixedly connected inside the cabinet (1). The inner side of the connecting cover (4) is provided with a digging component for digging out the damaged sealing rubber (3) and a sealing repairer is used to achieve sealing repair. A stepped clamping auxiliary component, located inside the connecting cover (4), is used to press down the filled repair fluid. The stepped clamping auxiliary component includes: Three stepped clamping blocks (25) are arranged above the sealing rubber (3), and the three stepped clamping blocks (25) are slidably connected to each other in pairs.

2. A high- and low-voltage cable branch box with an insulation repair structure according to claim 1, characterized in that, The excavation assembly includes a connecting plate (22) disposed inside the connecting cover (4), an excavation blade (23) disposed at the bottom of the connecting plate (22), an electric push rod for driving the excavation blade (23) to move downwards is mounted on the top of the connecting plate (22), and a collection bin (6) for collecting waste is provided inside the connecting cover (4).

3. A high- and low-voltage cable branch box with an insulation repair structure according to claim 2, characterized in that, The excavation assembly also includes a spur gear ring (8) rotatably connected to the inner side of the connecting cover (4). A drive motor (7) is installed on the top of the connecting cover (4), and the output end of the drive motor (7) passes through the inner side of the connecting cover (4) and is fixedly connected to a spur gear (19) that meshes with the spur gear ring (8). A suspension shell (16) is fixedly connected to the bottom of the spur gear ring (8), and a guide rod (17) is slidably connected to the inner side of the suspension shell (16). The bottom of the guide rod (17) is fixedly connected to the connecting plate (22).

4. A high- and low-voltage cable branch box with an insulation repair structure according to claim 3, characterized in that, The sealing repair device also includes a second rectangular slide rod (27) slidably connected to the inner side of the connecting plate (22). A second auxiliary spring (29) is installed between the second rectangular slide rod (27) and the connecting plate (22). The bottom of the second rectangular slide rod (27) extends through to the bottom of the connecting plate (22) and is fixedly connected to a flow guide shell (12). A hydraulic cylinder (18) for driving the connecting plate (22) to move longitudinally is installed on one side of the suspension shell (16). A quantitative feeding assembly is provided between the flow guide shell (12) and the connecting cover (4).

5. A high- and low-voltage cable branch box with an insulation repair structure according to claim 4, characterized in that, The quantitative feeding assembly includes a rotating cover (5) rotatably connected to the inside of the connecting cover (4). A storage box (11) is fixedly connected to one side of the rotating cover (5). The storage box (11) is fixedly connected to the spur gear ring (8) through a suspension seat (20). A piston block (21) is slidably connected to the inside of the storage box (11). A connecting spring (15) is installed between the piston block (21) and the storage box (11). A first one-way valve (10) is installed at the inlet of the storage box (11), and one end of the first one-way valve (10) extends into the inside of the connecting cover (4). A second one-way valve (13) is fixedly connected at the outlet of the storage box (11), and the second one-way valve (13) is connected to the guide shell (12) through a connecting hose (14).

6. A high- and low-voltage cable branch box with an insulation repair structure according to claim 5, characterized in that, The quantitative feeding assembly also includes a spherical rod (24) fixedly connected to the top of the piston block (21), and a drive ring (9) fixedly connected to the inner side of the connecting cover (4). The bottom of the drive ring (9) is provided with a spiral inclined surface, and a plane is provided between the lowest point and the highest point of the spiral inclined surface, and the plane is parallel to the lowest point of the spiral inclined surface.

7. A high- and low-voltage cable branch box with an insulation repair structure according to claim 5, characterized in that, The stepped clamping auxiliary assembly includes a first rectangular slide bar (26) fixedly connected to the top of each clamping block (25). One end of the first rectangular slide bar (26) extends through to the top of the connecting plate (22) and is slidably connected to the connecting plate (22). A first auxiliary spring (28) is installed between the connecting plate (22) and the first rectangular slide bar (26).

8. A high- and low-voltage cable branch box with an insulation repair structure according to claim 7, characterized in that, The three clamping blocks (25) are combined with the flow guide shell (12) in a stepped clamping shape, and the inner side of the clamping blocks (25) is provided with a slope.

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