Grounding box for cable protection

Abstract

The application relates to a grounding box for cable protection and belongs to the technical field of cable grounding boxes. The application comprises a box body, a wire-through pipe arranged on the vertical wall of the box body, a fixed clamping sleeve arranged in the axial direction of the wire-through pipe in the box body, a sliding sleeve, the sliding sleeve being slidably arranged in the wire-through pipe in the axial direction of the wire-through pipe, a conical sleeve connected to one end of the sliding sleeve in the direction of the box body, the small-diameter end of the conical sleeve being in the direction of the box body and the inner diameter of the small-diameter end of the conical sleeve being matched with the outer diameter of the cable connecting end, the inner diameter of the fixed clamping sleeve in the loosened state being matched with the inner diameter of the small-diameter end of the conical sleeve, and the sliding sleeve being capable of sliding in the direction of the box body to drive the small-diameter end of the conical sleeve to move to the entrance of the fixed clamping sleeve. The application can make the connecting end of the cable more easily inserted into the fixed clamping sleeve, and the assembly efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of cable grounding box technology, and in particular to a grounding box for cable protection. Background Technology

[0002] Cable grounding boxes are critical protective devices in high-voltage single-core power cable lines. Their main function is to control the induced voltage on the cable's metal sheath, prevent overvoltage from breaking down the outer sheath, suppress circulating currents, and ensure the safe operation of the cable. A cable grounding box mainly consists of three parts: a protective outer shell, an internal electrical connection and insulation system, and core protective components.

[0003] For example, the patent disclosed in authorization announcement number CN219394334U discloses a cable protection grounding box. The grounding box includes a shell, epoxy grounding hardware, E-type clamps, movable clamps, and limiting bottom sleeves. The E-type clamps and limiting bottom sleeves are both located inside the shell, the epoxy grounding hardware is located outside the shell, the movable clamps are located above the limiting bottom sleeves, and an installation base is fixedly installed on the lower outer surface of the shell. An outlet pipe is fixedly connected to the front end of the outer surface of the shell. The E-type clamps can firmly fix the inner core of the cable. The cooperation between the movable clamps and the limiting bottom sleeves can firmly secure the surface of the coaxial cable passing through the shell, thus increasing the stability of the coaxial cable after installation and improving the safety of use. In addition, the silicone rubber jacket and insulating support plate provide insulation, giving the grounding box an insulating effect.

[0004] In this type of cable grounding box, there is usually a gap between the outlet pipe and the clamp. In practical applications, in order to ensure that the heat of the cable can be better dissipated during operation and to facilitate the cable passing through the inlet pipe, electrical installation specifications usually require that the cross-sectional area of ​​the cable does not exceed 40% of the cross-sectional area inside the outlet pipe. The diameter of the outlet pipe is usually much larger than the diameter of the cable. At the same time, the end of the cable usually has a certain curvature. Thus, when assembling the cable onto the grounding box, it is usually difficult to ensure that the end of the cable can accurately extend into the clamping area of ​​the clamp after passing through the inlet pipe. The assembler needs to constantly adjust the position of the cable during the process of inserting the cable into the grounding box, or first pass the end of the cable through the outlet pipe into the box, and then grasp the end of the cable that extends into the box and lead the cable to the clamping area of ​​the clamp. This makes the cable threading process cumbersome and affects the assembly efficiency. Summary of the Invention

[0005] This invention provides a grounding box for cable protection to solve the technical problem in the prior art where the process of inserting the cable end into the clamping area of ​​the grounding box's inner sleeve when assembling the cable onto the grounding box is cumbersome and affects assembly efficiency.

[0006] To solve the above problems, the present invention provides a grounding box for cable protection, which adopts the following technical solution:

[0007] A grounding box for cable protection includes a box body with a conduit on its vertical wall. Inside the box body is a fixed sleeve arranged axially along the conduit. It also includes a sliding sleeve that slides axially through the conduit. A tapered sleeve is connected to the end of the sliding sleeve facing inwards. The smaller diameter end of the tapered sleeve faces inwards, and its inner diameter matches the outer diameter of the cable connection end. The fixed sleeve has a clamping area; when the fixed sleeve is in the open state, the inner diameter of the clamping area matches the inner diameter of the smaller diameter end of the tapered sleeve. The sliding sleeve can slide within the conduit, allowing the smaller diameter end of the tapered sleeve to move to the entrance of the fixed sleeve. After the cable connection end is fixed to the fixed sleeve, the sliding sleeve can move away from the fixed sleeve, exposing the area of ​​the cable near the connection end. The box body also includes a locking structure for locking the sliding sleeve onto the box body after it has moved a set distance away from the fixed sleeve.

[0008] By employing the above technical solution, a sliding sleeve is installed inside the conduit, and a tapered sleeve is installed at the end of the sliding sleeve facing inwards from the enclosure. The sliding sleeve slides inwards until the small-diameter end of the tapered sleeve contacts the fixed clamp. After the cable end is inserted into the conduit, the cable connection end, guided by the sliding sleeve and tapered sleeve, directly exits through the small-diameter end of the tapered sleeve into the clamping area of ​​the fixed clamp. Due to the guidance of the sliding sleeve and tapered sleeve, the cable connection end can be blindly inserted into the clamping area of ​​the fixed clamp, making the cable insertion process more convenient and faster. After the cable is inserted into the clamping area of ​​the fixed clamp through the sliding sleeve and tapered sleeve, the cable connection end is fixed to the fixed clamp. Then, the sliding sleeve can be pushed outwards from the enclosure, exposing the area of ​​the cable near the connection end, facilitating the subsequent wrapping of waterproof tape around this area. After moving a set distance outwards from the enclosure, the sliding sleeve is locked to the enclosure by a locking structure, preventing the sliding sleeve from shaking on the enclosure.

[0009] Furthermore, an elastic element capable of extending and retracting along the axial direction of the sliding sleeve is provided between the sliding sleeve and the inner wall of the housing. When the elastic element is in a free state, the small-diameter end of the tapered sleeve is located at the entrance of the fixed clamp. The locking structure includes a limiting rack, which is elastically and slidably mounted on the housing. The bottom of the limiting rack is provided with multiple locking teeth arranged at intervals along the axial direction of the sliding sleeve. The side of the locking teeth facing the fixed clamp is a guide slope that slopes downwards and away from the fixed clamp. The side of the locking teeth away from the fixed clamp is a vertical limiting plane. A locking plate is connected to the side of the tapered sleeve facing the fixed clamp. When the sliding sleeve moves away from the fixed clamp, the locking plate pushes the limiting rack past the locking teeth through the guide slope and is locked.

[0010] Using the above technical solution, an elastic element is provided between the sliding sleeve and the housing. The elastic element directly keeps the small diameter end of the tapered sleeve in contact with the fixed clamp. It is not necessary to manually push the sliding sleeve toward the inside of the housing to make its small diameter end contact the fixed clamp. By setting a limiting rack and a locking plate, the sliding sleeve can be locked and positioned by simply pushing the sliding sleeve toward the outside of the housing a set distance. The locking method is simple, convenient to operate, and more efficient.

[0011] Furthermore, an unlocking pull ring is connected to the limiting rack. The unlocking pull ring can be pulled to move the limiting rack away from the sliding sleeve, so that the sliding sleeve is released under the action of the elastic element until the small diameter end of the tapered sleeve is located at the entrance of the fixed sleeve.

[0012] Using the above technical solution, the sliding sleeve can be unlocked by pulling the unlocking ring.

[0013] Furthermore, the inner wall of the conical sleeve is provided with a flexible rubber layer.

[0014] Using the above technical solution, as the cable connection end passes through the conical sleeve towards the inside of the box, it will abut against the inner wall of the conical sleeve and slide on the inner wall of the conical sleeve. By setting a flexible rubber groove on the inner wall of the conical sleeve, hard metal friction between the cable connection end and the conical sleeve can be avoided, thus preventing wear on the cable connection end.

[0015] Furthermore, the inner side of the sliding sleeve is provided with multiple support members, which are evenly distributed around the axis of the sliding sleeve. Each support member has a connecting side and a supporting side. The connecting side is attached to the inner wall of the sliding sleeve and is rotatably mounted on the sliding sleeve around a rotation axis parallel to the axis of the sliding sleeve. A torsion spring is provided between the connecting side and the sliding sleeve. When the torsion spring is in a free state, the supporting side is attached to the inner wall of the sliding sleeve. The multiple support members can rotate synchronously around the rotation axis of the connecting side, so as to drive the supporting sides of the multiple support members to swing synchronously away from the inner wall of the sliding sleeve and press against the outer wall of the cable.

[0016] By employing the above technical solution, support components are installed inside the sliding sleeve. By swinging multiple support components until their supporting sides press against the outer wall of the cable, the portion of the cable located inside the sliding sleeve can be supported. This ensures that the portion of the cable inside the sliding sleeve remains relatively fixed to the sleeve, preventing violent shaking between the cable and the sleeve due to wind during operation of the junction box. This avoids deformation or damage to the heat-shrinkable sealing tube on the outside of the conduit and cable at the outer end of the conduit. Simultaneously, the support components pressing firmly against the outside of the cable effectively adds a fixing structure to the cable, making the cable more securely fixed to the junction box.

[0017] Furthermore, one end of the support member facing the outside of the housing is connected to an eccentric shaft with an axis parallel to the rotation axis of the support member. A coaxial trigger ring is provided inside the sliding sleeve. Multiple strip holes extending radially along the trigger ring are evenly distributed on the trigger ring. Each eccentric shaft passes through each strip hole. The trigger ring and the sliding sleeve are screwed together so that the trigger ring can rotate while moving relative to the sliding sleeve toward the inside of the housing.

[0018] By adopting the above technical solution, the trigger ring can be rotated by pushing it to move along the axial direction. When the trigger ring rotates, it can drive each support component to swing synchronously, thereby pressing it onto the cable. The method of adjusting the state of the support components is more convenient.

[0019] Furthermore, the outer end of the conduit is provided with an annular baffle, and a push rod is vertically connected to the annular baffle facing the inner wall of the box. During the process of the sliding sleeve moving away from the fixed clamp, the trigger ring contacts the push rod and is pushed by the push rod to move towards the fixed clamp, thereby driving each support component to rotate so that each support side is pressed on the outer wall of the cable.

[0020] Using the above technical solution, the conduit is equipped with an annular baffle, and a push rod is connected to the annular baffle. After the cable passes through the tapered sleeve and is connected to the fixed clamp, when the sliding sleeve is pushed towards the outside of the box, the push rod directly pushes the trigger ring to move towards the inside of the box, thereby causing each support component to swing synchronously until it is pressed against the outer wall of the cable on the support side. When the locking plate is locked by the strip-shaped teeth, the position of each support component is also locked, so there is no need to set up a separate locking structure for locking the support components.

[0021] Furthermore, a coaxial transition sleeve is provided inside the conduit. One end of the transition sleeve is connected to the inner ring of the annular baffle. The transition sleeve is located inside the trigger ring and has multiple clearance intervals on it to avoid each support component.

[0022] By adopting the above technical solution, a transition sleeve is set to prevent the cable from being blocked by the trigger ring during the process of passing the cable from the sliding sleeve to the tapered sleeve.

[0023] Furthermore, the outer wall of the conduit is provided with multiple annular grooves arranged at intervals along the axial direction of the conduit.

[0024] Using the above technical solution, the heat-shrinkable sealing tube, which is fitted onto the outside of the conduit and cable, can be inserted into the annular groove after heat shrinking, making the heat-shrinkable sealing tube more firmly connected to the outside of the conduit and avoiding sealing failure.

[0025] Furthermore, the top of the box is provided with a connecting edge, and a sealing groove is provided on the connecting edge, with a sealing strip inside the sealing groove.

[0026] By adopting the above technical solution, the sealing effect can be improved.

[0027] The beneficial effects of the grounding box for cable protection provided by this invention are as follows: By setting a sliding sleeve and a tapered sleeve inside the conduit, and ensuring that the small-diameter end of the tapered sleeve contacts the fixed clamp, the cable connection end is directly guided into the clamping area of ​​the fixed clamp after passing through the sliding sleeve and the tapered sleeve. This allows for blind insertion of the cable connection end, making the cable threading process more convenient and faster. By setting a support member, the portion of the cable located inside the conduit remains relatively fixed to the conduit. This prevents severe relative shaking between the cable and the conduit when the junction box is in operation due to wind, thus avoiding damage to the heat-shrinkable sealing tube sleeved on the outside of the conduit and cable at the outlet end of the conduit where stress is more concentrated. Attached Figure Description

[0028] Figure 1 A three-dimensional structural diagram of a grounding box for cable protection provided by the present invention;

[0029] Figure 2 This invention provides a three-dimensional structural diagram of a grounding box for cable protection after removing the box cover.

[0030] Figure 3 A cross-sectional view of a grounding box for cable protection provided by the present invention. Figure 1 ;

[0031] Figure 4 A cross-sectional view of a grounding box for cable protection provided by the present invention. Figure 2 ;

[0032] Figure 5 A three-dimensional structural diagram of the sliding sleeve in a grounding box for cable protection provided by the present invention;

[0033] Figure 6 A cross-sectional view of the trigger point in a grounding box for cable protection provided by the present invention;

[0034] Figure 7 A schematic diagram of the state of the trigger ring and support in a grounding box for cable protection provided by the present invention when the support is not tightened over the cable;

[0035] Figure 8 A schematic diagram of the state of the trigger ring and support member in a grounding box for cable protection provided by the present invention when the support member tightens the cable;

[0036] Figure 9 A front view of a conduit in a grounding box for cable protection provided by the present invention;

[0037] Figure 10 This is a cross-sectional view of a grounding box for cable protection provided by the present invention.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. Lid; 2. Body; 201. Connecting edge; 202. Sealing groove; 3. Handle; 4. Assembly plate; 401. U-shaped hole; 5. Conduit; 501. Annular groove; 502. Strip groove; 6. Annular baffle; 7. Mounting plate; 8. Fixing sleeve; 801. Main body; 802. Moving part; 9. Locking plate; 901. Extension plate segment; 10. Reinforcing plate; 11. Support plate; 12. Unlocking pull ring; 13. Limiting tooth 131. Clip; 14. Guide rod; 15. Elastic element three; 16. Conical sleeve; 17. Elastic element one; 18. Strip slider; 19. Elastic element two; 20. Connecting shaft; 21. Support rod; 22. Connecting plate; 23. Eccentric shaft; 24. Trigger ring; 241. Strip hole; 25. Connecting plate; 26. Limiting plate; 27. Turning plate; 28. Sliding sleeve; 29. ​​Push rod; 30. Arc baffle; 31. Reinforcing rib. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0041] The following is one embodiment of a grounding box for cable protection provided by the present invention:

[0042] like Figures 1-10 As shown, a grounding box for cable protection includes a box body 2, a sliding sleeve 28, and a locking structure.

[0043] like Figure 2 As shown, the top of the enclosure 2 is open, while the sides and bottom are closed. Four conduits 5, evenly spaced along the left-right direction, are installed on the rear wall of the enclosure 2. These conduits 5 are fixed to the enclosure 2 by laser welding and communicate with the inner cavity of the enclosure 2. Figure 9 , Figure 10 As shown, an annular baffle 6 is connected to the rear end of the conduit 5. Three push rods 29, evenly distributed around the axis of the conduit 5, are vertically connected to the side of the annular baffle 6 facing the inside of the housing 2. Multiple annular grooves 501, evenly distributed along the front-back direction, are provided on the outer wall of the conduit 5. The annular grooves 501 are used to allow the heat-shrinkable sealing tube on the outside of the conduit 5 to be inserted.

[0044] like Figure 3 , Figure 4As shown, each conduit 5 has a sliding sleeve 28 inserted inside it. The outer wall of the sliding sleeve 28 is provided with a strip-shaped slider 18 extending back and forth, and the inner wall of the conduit 5 is provided with a strip-shaped groove 502 extending back and forth. The strip-shaped slider 18 is inserted into the strip-shaped groove 502, so that the sliding sleeve 28 is guided to slide through the conduit 5, and the relative rotation between the sliding sleeve 28 and the conduit 5 is stopped.

[0045] like Figure 4 , Figure 5 As shown, a tapered sleeve 16 is coaxially connected to the front end of the sliding sleeve 28. The tapered sleeve 16 has a tapered inner hole, with its small-diameter end facing forward. The inner diameter of the small-diameter end of the tapered sleeve 16 is matched with the outer diameter of the cable connection end. Here, "matched" means that the inner diameter of the small-diameter end of the tapered sleeve 16 is slightly larger than the outer diameter of the cable connection end. This is because the outer diameter of the main body of the cable near the connection end is slightly larger than the outer diameter of the connection end, ensuring that the main body of the cable near the connection end can pass through. A ring-shaped locking plate 9 is connected to the front end of the tapered sleeve 16. The top of the locking plate 9 has a protruding extension plate section 901. An elastic element 17 capable of elastic expansion and contraction is provided between the locking plate 9 and the rear inner wall of the housing 2. The elastic element 17 is fitted onto the outside of the tapered sleeve.

[0046] To prevent hard wear between the cable connection end and the inner wall of the tapered sleeve 16, a flexible rubber layer is provided on the inner wall of the tapered sleeve 16. The flexible rubber layer is cut into a fan-shaped ring and attached to the inner wall of the tapered sleeve 16 with a strong adhesive.

[0047] like Figure 4 , Figure 5 As shown, two sets of connecting plates are connected to the inner wall of the sliding sleeve 28, arranged at intervals. Each set of connecting plates includes three connecting plates 25 evenly arranged around the axis of the sliding sleeve 28. A support member is provided between each pair of corresponding connecting plates 25. The support member includes a connecting shaft 20, a support rod 21, and two connecting plates 22. The connecting shaft 20 extends in the front-to-back direction and is rotatably connected between the two opposing connecting plates 25. The front and rear ends of the connecting shaft 20 extend to the outer sides of the two connecting plates 25, respectively. The support rod 21 is parallel to the connecting shaft 20. The two connecting plates 22 are arranged at intervals and are respectively connected between the support rod 21 and the front and rear ends of the connecting shaft 20. The side where the connecting shaft 20 is located is the connecting side of the support member, and the side where the support rod 21 is located is the supporting side of the support member.

[0048] like Figure 4 , Figure 5 As shown, a bending plate 27 is vertically connected to the rear end of the connecting shaft 20, and an eccentric shaft 23 extending forward and backward is connected to the rear side of the bending plate 27. The eccentric shaft 23 is parallel to the connecting shaft 20.

[0049] like Figure 4 , Figure 6 As shown, the inner side of the sliding sleeve 28 is also provided with a coaxial trigger ring 24. Three radially extending slots 241 are evenly distributed on the trigger ring 24, and each eccentric shaft 23 passes through one of the slots 241 on the trigger ring 24. The trigger ring 24 is screwed into the sliding sleeve 28. An elastic element 19 capable of retracting back and forth is provided between the trigger ring 24 and the connecting plate assembly located at the rear. Figure 7 As shown, when the elastic element 19 is in a free state, the position of the trigger ring 24 keeps the eccentric shaft 23 in a state where the support rod 21 in the support member is against the inner wall of the sliding sleeve 28. Figure 8 As shown, when the trigger ring 24 is pushed forward, the trigger ring 24 can be driven to rotate. At the same time, the strip hole 241 on the trigger ring 24 drives each eccentric shaft 23 to swing, which in turn drives the support to swing. The support rod 21 in each support is pressed against the outer wall of the cable to support the cable.

[0050] like Figure 2 , Figure 3 As shown, four support plates 11 are arranged at equal intervals along the left and right directions on the rear inner side wall of the aforementioned box 2. Each support plate 11 is arranged above each sliding sleeve 28. A reinforcing plate 10 is provided between the left and right sides of each support plate 11 and the rear inner side wall of the box 2.

[0051] like Figure 3 As shown, the locking structure includes a limiting rack 13, located between the sliding sleeve 28 and the support plate 11. The bottom of the limiting rack 13 has multiple teeth 131 arranged at equal intervals front to back. The front side of each tooth 131 has a guide slope that slopes downwards and backwards, and the rear side of each tooth 131 has a vertically arranged limiting plane. Two vertically extending guide rods 14 are connected to the top of the limiting rack 13, arranged at intervals front to back. The guide rods 14 slide vertically through the support plate 11, and the top of each guide rod 14 is connected to a horizontal limiting plate 26. A U-shaped unlocking pull ring 12 with its opening facing downwards is connected between the two limiting plates 26. Two vertically extendable elastic elements 15 are connected between the support plate 11 and the limiting rack 13. The two elastic elements 15 are respectively sleeved on the outside of the two guide rods 14. When the elastic elements 15 are in a free state, the bottom end of the limiting rack 13 is lower than the top end of the aforementioned extension plate segment 901.

[0052] like Figure 2As shown, a horizontal mounting plate 7 is provided in the middle of the inner cavity of the housing 2. Four fixing sleeves 8 are arranged at equal intervals along the left-right direction on the mounting plate 7. Each fixing sleeve 8 includes a main body 801 and a movable part 802 hinged to the main body 801. A torsion spring is also provided between the movable part 802 and the main body 801. An arc-shaped groove is provided on each side of the main body 801 and the movable part 802 facing each other. The area between two arc-shaped grooves is the clamping area on the fixing sleeve 8. When the movable part 802 is in a state away from the fixing part, that is, when the fixing sleeve 8 is in an open state, the inner diameter of the clamping area is consistent with the inner diameter of the small diameter end of the conical sleeve, and each clamping area is aligned front-to-back with the small diameter end of each conical sleeve. A locking bolt extending to the left and right along an axis is threaded through the movable part 802. The locking bolt passes through the movable part 802 and is screwed onto the main body 801. By screwing the locking bolt, the movable part 802 is brought closer to the fixed part, thereby clamping the cable connection end onto the fixed sleeve 8.

[0053] When the aforementioned elastic element 17 is in a free state, the conical sleeve remains in a state where it extends to the inside of the housing 2 and the front end of the conical sleeve abuts against the rear side of the fixed clamp 8.

[0054] like Figure 2 As shown, the top of the box 2 is provided with a connecting edge 201, and the connecting edge 201 is also provided with a sealing groove 202 for placing the sealing strip. Multiple connecting holes are provided on the connecting edge 201 outside the sealing groove 202. The box 2 is provided with a box cover 1 on top. The box cover 1 is fixedly connected to the top of the box 2 by bolts. The box cover 1 presses the sealing strip between the box cover 1 and the box 2 to achieve sealing of the grounding wire. The top of the box cover 1 is also provided with two handles 3 arranged at intervals on the left and right. The handles 3 are used for people to hold and move the junction box or remove the box cover 1.

[0055] The box body 2 and the box cover 1 are made of stainless steel. Each of the four corners of the inner cavity of the box body 2 is provided with a reinforcing rib 31. Each of the four corners of the bottom of the box body 2 is connected to an assembly plate 4. The assembly plate 4 is provided with U-shaped holes 401 for fixing the box body 2 to other structures.

[0056] like Figure 10As shown, to prevent the trigger ring 24 at the rear end of the sliding sleeve 28 located inside the conduit 5 from obstructing the cable passing through the conduit 5 when the locking plate 9 and the fixed clamp 8 are in contact, a transition sleeve is coaxially connected inside the conduit 5. The rear end of the transition sleeve is connected to the inner ring of the annular baffle 6. The inner diameter of the transition sleeve is smaller than the inner diameter of the trigger ring 24. The transition sleeve passes inside the trigger ring 24. The transition sleeve includes three arc-shaped baffles 30 evenly arranged around the axis of the conduit 5. There is a gap between any two adjacent arc-shaped baffles 30. This gap is the clearance gap on the transition sleeve. The three clearance gaps correspond to the positions of three support members to avoid rotating support members. When assembling the cable, the cable connection end is attached to one of the arc-shaped baffles 30 and passed through the transition sleeve to the conical sleeve 16.

[0057] In use, the tapered sleeve 16 is initially held at the entrance of the fixed sleeve by the elastic element 17, with its small diameter end located at the entrance of the fixed sleeve, i.e., the front end of the tapered sleeve 16 abuts against the rear end of the fixed sleeve 8. At this time, the inner cavities of the sliding sleeve 28 and the tapered sleeve 16 are sequentially connected to the clamping area on the fixed sleeve 8. The end of the cable is inserted into the transition sleeve inside the sliding sleeve 28 and then into the inner side of the tapered sleeve 16. The connection end of the cable is on the inner wall of the tapered sleeve 16. Guided by the small-diameter end of the tapered sleeve 16, it is directly inserted into the clamping area of ​​the fixed clamp 8. The locking bolt is tightened to fix the cable connection end to the fixed clamp 8. Then, the locking plate 9 is pushed backward. The extension plate segment 901 at the top of the locking plate 9 contacts the teeth 131 at the bottom of the limiting teeth 131. It moves backward in sequence past each tooth 131. As the locking plate 9 moves backward, it drives the tapered sleeve 16 and the sliding sleeve 28 to move backward. The inner side of the sliding sleeve 28 The trigger ring 24 contacts the push rod 29 and is pushed forward by the push rod 29. When the trigger ring 24 moves forward, it will also rotate due to the helical engagement with the sliding sleeve 28. When the trigger ring 24 rotates, it pushes the eccentric shaft 23 relative to the axis of the connecting shaft 20 through the inner wall of each strip hole 241 on it, thereby driving the connecting shaft 20 to rotate. The connecting shaft 20 drives the support rod 21 to swing through the connecting plate 22. The support rod 21 swings to press against the outer wall of the cable. Multiple support rods 21 support the cable in the middle of the inner cavity of the sliding sleeve 28. When the locking plate 9 can no longer be pushed backward, it means that each support rod 21 has clamped the cable. At this time, the locking plate 9 is released. The locking plate 9 is locked in the position by the tooth 131 at the bottom of the limiting rack 13. The position of each support remains fixed, and each support rod 21 also remains pressed against the outer wall of the cable. At this time, the connection and fixation of one of the cables is completed.

[0058] At this point, the portion of the cable near the connection end is exposed. A layer of waterproof tape is wrapped around this area to seal the connection end of the cable with its outer protective layer, preventing liquid from entering and damaging the cable. Then, the heat-shrinkable sealing tube, which is sleeved on the conduit 5 and located on the outside of the box 2, is heated. After heating, the sealing tube shrinks and gets stuck in the annular groove 501 on the conduit 5, making the sealing tube more securely fixed to the outside of the conduit 5.

[0059] After all the cables are connected, place the sealing strip in the sealing groove 202 on the connecting edge 201 of the box 2, place the box cover 1 on top of the box 2, and use the connecting bolts to fix the box cover 1 to the box 2 to complete the connection and assembly of the cables and the grounding box.

[0060] If it is necessary to replace or disassemble the junction box or some of its cables later, the box cover 1 can be removed first, and then the unlocking ring 12 can be pulled up to disengage the limiting rack 13 from the extension plate 901 on the locking plate 9. At this time, the tapered sleeve 16 and the sliding sleeve 28 move forward under the action of the elastic element 17, and the support rod 21 in each support component loosens the cable. Then, the locking bolt is loosened, the connection end of the cable is removed from the fixed clamp 8, the heat shrink sleeve is torn off, and the cable is pulled out from the box 2, thus completing the disassembly of the cable.

[0061] This invention, by setting a sliding sleeve 28 and a conical sleeve 16, allows the connecting end of the cable to directly enter the clamping area of ​​the fixed clamp 8 when it is inserted into the housing 2, achieving blind insertion and higher cable pulling efficiency. This invention also sets a support body and makes the support body drively connected to the sliding sleeve 28. When the sliding sleeve 28 and the conical sleeve 16 move backward to expose the main body of the cable near the connecting end, the support body is driven to swing, thereby pressing the support rod 21 against the outer wall of the cable and clamping the part of the cable located inside the sliding sleeve 28. This can achieve double fixation of the cable and keep the part of the cable located inside the sliding sleeve 28 relatively fixed to the sliding sleeve 28, avoiding the cable shaking relative to the sliding sleeve 28, which would cause the sealing heat shrink sleeve sleeved on the outside of the cable pulling tube 5 to be easily damaged at the outlet end of the cable pulling tube 5.

[0062] In this embodiment, the locking structure includes a limiting rack 13. During the process of pushing the conical sleeve 16 backward, the extension plate segment 901 is blocked by the locking teeth 131 at the bottom of the limiting rack 13, thereby locking the position of the conical sleeve 16 and the sliding sleeve 28 in the front-back direction. In other embodiments, the locking structure can be a bolt. A connecting hole 1 is opened on the locking plate 9, and an L-shaped plate is connected to the rear inner side wall of the housing 2. The horizontal section of the L-shaped plate is connected to the rear inner side wall of the housing 2, and a connecting hole 2 is provided on the vertical section of the L-shaped plate, which is coaxial with the connecting hole. When the conical sleeve 16 moves backward to the point where it can no longer move backward, the bolt is inserted into the connecting hole 1 and the connecting hole 2, and the nut is tightened to fix the position of the conical sleeve 16 and the sliding sleeve 28 in the front-back direction.

[0063] In this embodiment, the tapered sleeve 16 is an integral sleeve. In other embodiments, the tapered sleeve 16 includes three sleeve units evenly arranged around its axis. The three sleeve units can be spliced ​​to form a complete tapered sleeve 16. The rear end of each sleeve unit is hinged to the sliding sleeve 28 around an axis tangential to the outer wall of the sliding sleeve 28, and a torsion spring is provided between the sleeve unit and the sliding sleeve 28. In this case, the inner diameter of the small-diameter end of the tapered sleeve 16 can be consistent with the outer diameter of the cable connection end, only slightly larger than the outer diameter of the cable connection end. The portion wider than the cable connection end can push the sleeve unit open when the cable moves forward, so that the main body of the cable, which is wider than the connection end, can easily pass through the small-diameter end of the tapered sleeve 16. In this way, the size of the small-diameter end of the tapered sleeve 16 can be made closer to the size of the cable connection end, thereby improving the alignment accuracy between the cable connection end passing through the small-diameter end and the fixed clamp.

Claims

1. A grounding box for cable protection, comprising a box body, a conduit for threading cables provided on the vertical wall of the box body, and a fixing sleeve arranged axially on the conduit inside the box body, characterized in that, It also includes a sliding sleeve, which slides along the axial direction of the conduit and is installed inside the conduit. A tapered sleeve is connected to the end of the sliding sleeve facing the inside of the housing. The small diameter end of the tapered sleeve faces the inside of the housing, and the inner diameter of the small diameter end of the tapered sleeve is adapted to the outer diameter of the cable connection end. The fixed clamp has a clamping area. When the fixed clamp is in the loose state, the inner diameter of the clamping area is adapted to the inner diameter of the small diameter end of the tapered sleeve. The sliding sleeve can slide inside the conduit so that the small diameter end of the tapered sleeve can move to the entrance of the fixed clamp. The sliding sleeve can move away from the fixed clamp after the cable connection end is fixed on the fixed clamp so that the area of ​​the cable near the connection end is exposed. The housing is also provided with a locking structure, which is used to lock the sliding sleeve on the housing after the sliding sleeve moves away from the fixed clamp a set distance. An elastic element capable of extending and retracting along the axial direction of the sliding sleeve is provided between the sliding sleeve and the inner wall of the housing. When the elastic element is in a free state, the small-diameter end of the tapered sleeve is located at the entrance of the fixed clamp. The locking structure includes a limiting rack, which is elastically and slidably mounted on the housing. The bottom of the limiting rack is provided with multiple locking teeth arranged at intervals along the axial direction of the sliding sleeve. The side of the locking teeth facing the fixed clamp is a guide slope that slopes downwards and away from the fixed clamp. The side of the locking teeth away from the fixed clamp is a vertical limiting plane. A locking plate is connected to the side of the tapered sleeve facing the fixed clamp. When the sliding sleeve moves away from the fixed clamp, the locking plate pushes the limiting rack past the locking teeth through the guide slope and is locked.

2. The grounding box for cable protection according to claim 1, characterized in that, The limiting rack is connected to an unlocking pull ring. The unlocking pull ring can be pulled to move the limiting rack away from the sliding sleeve, so that the sliding sleeve is released under the action of the elastic element until the small diameter end of the tapered sleeve is located at the entrance of the fixed sleeve.

3. A grounding box for cable protection according to claim 1 or 2, characterized in that, The inner wall of the conical sleeve is provided with a flexible rubber layer.

4. A grounding box for cable protection according to claim 1 or 2, characterized in that, The inner side of the sliding sleeve is also provided with multiple support members. The multiple support members are evenly distributed around the axis of the sliding sleeve. Each support member has a connecting side and a supporting side. The connecting side is attached to the inner wall of the sliding sleeve and is rotatably mounted on the sliding sleeve around a rotation axis parallel to the axis of the sliding sleeve. A torsion spring is provided between the connecting side and the sliding sleeve. When the torsion spring is in a free state, the supporting side is attached to the inner wall of the sliding sleeve. The multiple support members can rotate synchronously around the rotation axis of the connecting side, so as to drive the supporting side of the multiple support members to swing synchronously away from the inner wall of the sliding sleeve and press against the outer wall of the cable.

5. A grounding box for cable protection according to claim 4, characterized in that, One end of the support member facing the outside of the housing is connected to an eccentric shaft with an axis parallel to the rotation axis of the support member. A coaxial trigger ring is provided inside the sliding sleeve. Multiple strip holes extending radially along the trigger ring are evenly distributed on the trigger ring. Each eccentric shaft passes through each strip hole. The trigger ring and the sliding sleeve are screwed together so that the trigger ring can rotate while moving relative to the sliding sleeve toward the inside of the housing.

6. A grounding box for cable protection according to claim 5, characterized in that, The outer end of the conduit is equipped with an annular baffle. A push rod is vertically connected to the annular baffle facing the inner wall of the box. As the sliding sleeve moves away from the fixed sleeve, the trigger ring contacts the push rod and is pushed by the push rod toward the fixed sleeve, thereby driving each support component to rotate so that each support side is pressed onto the outer wall of the cable.

7. A grounding box for cable protection according to claim 6, characterized in that, The conduit is equipped with a coaxial transition sleeve. One end of the transition sleeve is connected to the inner ring of the annular baffle. The transition sleeve is located inside the trigger ring and has multiple clearance intervals for avoiding each support component.

8. A grounding box for cable protection according to claim 1 or 2, characterized in that, The outer wall of the conduit has multiple annular grooves arranged at intervals along the axial direction of the conduit.

9. A grounding box for cable protection according to claim 1 or 2, characterized in that, The top of the box has a connecting edge, and a sealing groove is provided on the connecting edge, with a sealing strip inside the sealing groove.

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