Double-clamp wire type power fitting

Abstract

The application relates to a double-clamping type electric power fitting and belongs to the technical field of electric power fittings. The application comprises clamping structure one and clamping structure two. The clamping structure one comprises a connecting seat one, two arc-shaped clamping plates one with opposite openings, a connecting seat two, a locking knob, a one-way limiting structure, a screw locking piece and a pushing rod. The connecting seat one is used for being fixed in a grounding box. The connecting seat one is provided with a slot. The two arc-shaped clamping plates one are arranged in the slot and fixed in the axial direction of the slot. The two arc-shaped clamping plates one are slidably arranged on the connecting seat one. The connecting seat two is used for being installed in the grounding box and located on the side of the arc-shaped clamping plate one away from the connecting seat one. The connecting seat two is provided with a hole two coaxial with the slot. The connecting seat two can slide along the axial direction of the hole two. The application can make the compression force more evenly distributed along the length direction of the cable, make the force on the cable more uniform, and has the effect of preventing loosening.

Description

Technical Field

[0001] This invention relates to the field of power fittings technology, and more particularly to a double-clamped power fitting. Background Technology

[0002] In modern power systems, especially medium and high voltage cable networks, grounding boxes are key equipment to ensure the safe and reliable operation of the system. They undertake important functions such as grounding of the cable's metal sheath or shielding layer, overvoltage protection, and cross-connection. The reliability of the electrical connections inside the grounding box is directly related to the safety of the cable itself, the level of line loss, and the stability of the entire power distribution network.

[0003] The functionality of a grounding box does not solely depend on its outer casing; its internal electrical connection system plays a crucial role. This system, comprised of various electrical fittings, is responsible for connecting multiple conductors to the grounding busbar or the terminals of the protection device. Therefore, the long-term reliability of a grounding box essentially depends on whether the connections provided by its internal fittings are safe, durable, and have low resistance.

[0004] Existing power fittings, such as the double-clamping type power fitting disclosed in patent CN213602382U, include a fixing base, a second fixing strip, a second fixing plate, a first nut, and a groove. A fixing block is placed on the fixing base, a first bolt passes through the fixing block, and the first fixing plate is fixed to the fixing block. A first fixing strip is fixed to the first fixing plate, a second bolt passes through the first fixing strip, a connecting rod passes through the fixing base, a hammer is fixed to the connecting rod, a second nut is installed on the second bolt, and the second fixing plate is fixed to the fixing base. This double-clamping type power fitting has two sets of fixing strips, left and right. The interaction between the first and second fixing strips provides excellent fixation for the fixing plate. Simultaneously, the mutual contact between the fixing base 1 and the fixing block 2 in the middle of the fixing strip further increases the force between the fixing plates, achieving double clamping of the conductor.

[0005] Although this power fitting can improve the clamping force on the cable through double clamping, the multiple clamping points require tightening multiple connecting bolts during cable assembly, making the operation cumbersome and the assembly efficiency low. At the same time, since this power fitting mainly relies on connecting bolts to clamp the cable, the main stress areas on the cable are actually distributed in a discrete point-like pattern. Some areas of the cable are overly stressed, which makes the connection area of ​​the cable prone to deformation and mechanical damage. After long-term use, under thermal expansion and contraction or external vibration, fatigue fracture is likely to occur. Summary of the Invention

[0006] This invention provides a double-clamping type power fitting to solve the technical problem that the assembly efficiency of existing power fittings is low and that the cables are prone to mechanical damage in the clamping area.

[0007] To solve the above problems, the present invention provides a double-clamped power fitting with the following technical solution:

[0008] A double-clamping type power fitting includes a clamping structure one and a clamping structure two. The clamping structure one includes:

[0009] Connector 1 is used for fixing inside the grounding box, and connector 1 is provided with a slot;

[0010] Two arc-shaped clamps with opposite openings are inserted at one end into the slot and fixed relative to the connecting seat in the axial direction of the slot. Both arc-shaped clamps are slidably mounted on the connecting seat along the opening direction.

[0011] Connector 2 is used to be installed inside the grounding box and is located on the side of the arc-shaped clamp 1 facing away from connector 1. Connector 2 is provided with hole 2 coaxial with the slot and connector 2 can slide along the axis of hole 2.

[0012] The locking knob is coaxial with the slot and rotatably mounted on the connecting seat, and rotatably sleeved on the outer side of the two arc-shaped clamps.

[0013] A one-way limiting structure is located between the locking knob and the connecting seat to lock the reversed locking knob;

[0014] The spiral locking component is spirally fitted on the outer side of two arc-shaped clamping plates. One end is connected to the locking knob, and the other end is connected to the connecting seat. The spiral locking component rotates in the same direction as the locking knob.

[0015] The push rod, parallel to the groove axis and movable along the length of the rod, is installed in the grounding box. One end of the push rod abuts against the second connecting seat, and the other end is connected to the locking knob through a transmission assembly so that when the locking knob is rotated forward, it drives the push rod to push the second connecting seat away from the first connecting seat.

[0016] Using the above technical solution, the end of the cable is inserted between two arc-shaped clamps. Then, the locking knob is turned, causing one end of the spiral locking component connected to the locking knob to rotate in the spiral direction of the spiral locking component. At the same time, the locking knob also drives the connecting seat two to move away from the connecting seat one through the push rod. The connecting seat two causes the other end of the spiral locking component to move away from the connecting seat one. The two ends of the spiral locking component move away from each other, and one end rotates in the spiral direction, making the spiral locking component thinner and longer, that is, the inner diameter of the spiral locking component becomes smaller. The spiral locking component is tightly wrapped around the outside of the two arc-shaped baffles, pushing the two arc-shaped clamps one closer together and clamping the cable. The spiral locking component is spirally arranged along the length of the two arc-shaped clamping plates. The clamping area is more evenly distributed along the length of the cable. Compared with the existing technology that sets bolt fastening points in different areas along the length of the cable, the clamping force on the cable is more evenly distributed and the force distribution is better. Moreover, the cable can be locked by simply turning the locking knob. Compared with the existing technology that requires turning multiple bolts, the operation steps are simpler and the assembly efficiency is higher.

[0017] Furthermore, the second clamping structure includes:

[0018] Two arc-shaped clamps with opposite openings are inserted into the hole and fixed relative to the connecting seat in the axial direction of the hole. Both arc-shaped clamps are slidably installed on the connecting seat in the direction of their openings. The end of the arc-shaped clamp that faces away from the connecting seat extends to the outside of the connecting seat. The outer wall of the arc-shaped clamp is conical, and the smaller diameter end faces away from the connecting seat.

[0019] Connector 3 is used to be fixed in the grounding box and is located on the side of connector 2 that is away from connector 1. Connector 3 has a hole 3 that is coaxial with hole 2. The small diameter end of arc-shaped clamp 2 passes through hole 3. The inner diameter of hole 3 is smaller than the outer diameter of the large diameter end of arc-shaped clamp 2.

[0020] When the second connecting seat is pushed towards the third connecting seat by the push rod, the two arc-shaped clamping plates are pushed closer to each other by the inner wall of the third hole.

[0021] By adopting the above technical solution, the clamping structure 2 is set to clamp another area at the end of the cable, making the connection between the cable and the grounding box more secure. At the same time, the push rod pushes the connecting seat 2 to move away from the connecting seat 1, while the connecting seat 3 squeezes the two arc-shaped clamping plates 2 to clamp the other area at the end of the cable. The clamping of the two areas at the end of the cable can be achieved by simply rotating the locking knob, which makes the clamping more secure and the assembly efficiency higher.

[0022] Furthermore, the one-way limiting structure includes a ratchet and a ratchet tooth. The ratchet is annular and sleeved on the outer side of two arc-shaped clamps. The ratchet is coaxial with the locking knob and relatively fixed. The ratchet tooth is elastically connected to the connecting seat on a rotation axis parallel to the groove axis. The ratchet tooth is locked in the slot on the ratchet. When the ratchet rotates forward, it can pass over the ratchet tooth, and when it rotates backward, it is blocked by the ratchet tooth.

[0023] The above technical solution uses a ratchet and tooth structure to control the locking knob to rotate only in one direction, which has the advantages of strong load-bearing capacity, simple structure, and high control accuracy.

[0024] Furthermore, the transmission assembly includes a spiral sleeve, a driving gear, and a driven gear. The spiral sleeve is rotatably mounted in the grounding box about a rotation axis parallel to the groove axis. The push rod is guided and slidably mounted in the grounding box along the axial direction of the spiral sleeve. The push rod spirally passes through the spiral sleeve. The driving gear is coaxial with the locking knob and relatively fixed. The driven gear is sleeved on the outside of the spiral sleeve to prevent rotation. The driving gear and the driven gear mesh.

[0025] Furthermore, the spiral sleeve is radially movable inside the grounding box, and an elastic element is provided between the spiral sleeve and the grounding box. When the elastic element is in a free state, the driving gear and the driven gear mesh.

[0026] Using the above technical solution, the driven gear can slide elastically. In the design, the number of turns of the locking knob required for the spiral locking component to clamp the cable is greater than the number of turns required for the two arc-shaped clamping plates to clamp the cable. In this way, during the process of turning the locking knob, the connecting seat 2 is first pushed to a state where it can no longer move toward the connecting seat 3. The two arc-shaped clamping plates clamp the cable first. At this time, the rotational resistance of the driven gear increases, and the driving gear can no longer drive the driven gear to rotate. The pressure between the driving gear and the driven gear increases, overcoming the elastic force of the elastic component 1, and pushing the driven gear open to continue rotating until the two arc-shaped clamping plates clamp the cable, ensuring that both sets of clamping structures can be clamped in place.

[0027] Furthermore, the spiral locking element can be detachably connected between the connecting seat and the locking knob.

[0028] Using the above technical solution, the spiral locking component is detachable, making it easy to replace.

[0029] Furthermore, the connecting seat 1 is provided with a movable column coaxial with the slot. The movable column is slidably installed on the connecting seat 1 along the axial direction. An elastic element 2 is provided between the movable column and the connecting seat 1. The elastic element 2 applies an elastic force to the movable column toward the connecting seat 2. When the elastic element 2 is in a free state, the connecting column passes through the slot. An anti-detachment push rod is provided between the connecting seat 1 and the connecting seat 2. The anti-detachment push rod is slidably installed on the connecting seat 1 and the connecting seat 2 along a direction parallel to the slot axis. The anti-detachment push rod is connected to the movable column. A one-way locking structure is provided between the anti-detachment push rod and the connecting seat 2. The one-way locking structure prevents the movement of the anti-detachment push rod toward the connecting seat 2.

[0030] Using the above technical solution, when installing the cable, insert the cable between two arc-shaped clamps and two arc-shaped clamps, and push the movable column with the end of the cable, causing the movable column to move out of the slot. At the same time, the anti-detachment push rod is connected to the connecting seat 2 through a one-way locking structure. During the process of the movable column moving out of the slot, the connecting seat 2 does not affect the movement of the anti-detachment push rod. When the movable column moves towards the connecting seat 2, the anti-detachment push rod and the stop 2 of the connecting seat 2 can push the connecting seat 2 to move. If the cable becomes loose and slides between the two arc-shaped clamps, the movable column moves towards the connecting seat 2 under the action of the elastic element 2, causing the connecting seat 2 to move away from the connecting seat 1. At this time, the spiral locking element continues to be stretched, and the inner diameter decreases, so that the two arc-shaped clamps clamp the cable again, preventing the cable from slipping.

[0031] Furthermore, the one-way locking structure includes a locking block and multiple limiting teeth. The connecting seat 2 has a through hole, the locking block is located in the through hole and is elastically slidably mounted on the connecting seat 2. The locking block has a limiting slope on the side facing away from the connecting seat 1. Multiple limiting teeth are arranged at intervals on the anti-detachment rod along the rod length direction. The limiting teeth have a pushing slope on the side facing the connecting seat 1. The anti-detachment rod passes through the through hole, and the pushing slope fits against the limiting slope.

[0032] Furthermore, a pressure block is connected to one end of the push rod facing the second connecting seat. The pressure block has two horizontally spaced pressing ends, which press against the second connecting seat.

[0033] By adopting the above technical solution, the force distribution of the second connecting seat is more uniform, making it easier to move the second connecting seat.

[0034] Furthermore, a ring of anti-slip protrusions is provided on the outer wall of the locking knob.

[0035] Using the above technical solution, the anti-slip protrusions can increase friction and make it easier to turn the locking knob.

[0036] The beneficial effects of the double-clamping power fitting provided by this invention are as follows: This invention can achieve simultaneous clamping at multiple locations in the cable simply by turning the locking knob, simplifying the cable installation process and increasing installation efficiency. Furthermore, the spiral locking element in this invention allows the clamping force to be distributed more evenly along the cable length, resulting in more uniform stress on the cable and preventing mechanical damage or deformation caused by stress concentration. Attached Figure Description

[0037] Figure 1 A three-dimensional structural diagram of a double-clamped power fitting provided by the present invention. Figure 1 ;

[0038] Figure 2 A three-dimensional structural diagram of a double-clamped power fitting provided by the present invention. Figure 2 ;

[0039] Figure 3 A top view of a double-clamped power fitting provided by the present invention;

[0040] Figure 4 A side view of a double-clamped power fitting provided by the present invention;

[0041] Figure 5 A side sectional view of a double-clamped electrical fitting provided by the present invention;

[0042] Figure 6 for Figure 5 Enlarged structural diagram at point A;

[0043] Figure 7 A top-view sectional view of a double-clamped electrical fitting provided by the present invention;

[0044] Figure 8 This is a cross-sectional view of the unidirectional limiting structure in a double-clamped power fitting provided by the present invention.

[0045] Explanation of reference numerals in the attached figures:

[0046] 1. Connecting seat one; 101. Groove; 102. Guide hole; 2. Connecting seat two; 201. Through hole; 3. Connecting seat three; 4. Arc-shaped clamping plate one; 5. Spiral locking component; 6. Locking knob; 7. Arc-shaped clamping plate two; 8. Drive gear; 9. Spring three; 10. Support frame; 11. Push rod; 111. Guide rod section; 12. Movable column; 13. Elastic component two; 14. Mounting plate; 15. Anti-detachment push rod; 151. Limiting tooth; 152. Pushing inclined surface; 16. Pressure block; 17. Driven gear; 18. Cable; 19. Ratchet; 191. Slot; 20. Spiral sleeve; 21. Mounting frame; 22. Elastic component one; 23. Ratchet; 24. Limiting ring; 241. Receiving groove; 25. Locking block; 251. Limiting inclined surface. Detailed Implementation

[0047] 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.

[0048] The following is one embodiment of a double-clamped power fitting provided by the present invention:

[0049] like Figures 1-8 As shown, a double-clamped power fitting includes a clamping structure one, a clamping structure two, and an anti-loosening component arranged in a grounding box.

[0050] like Figures 1-4 As shown, the clamping structure includes a connecting seat 1, an arc-shaped clamping plate 4, a connecting seat 2, a locking knob 6, a one-way limiting structure, a spiral locking component 5, and a push rod 11.

[0051] like Figure 1 , Figure 8 As shown, connector 1 is fixed in the grounding box, and connector 1 has a slot 101 with the opening facing backward. Connector 1 has a guide hole 102 with a square cross-section and penetrating from front to back at the middle position of the bottom.

[0052] A limiting ring 24 coaxial with the slot 101 is connected to the rear side of the connecting seat 1. The limiting ring 24 is provided with a plurality of evenly arranged receiving slots 241.

[0053] like Figure 3As shown, there are two arc-shaped clamps 4, with their openings facing each other and arranged symmetrically from left to right. The front ends of the two arc-shaped clamps 4 pass through the slots 101 on the connecting seat 1, and their rear ends extend to the rear of the arc-shaped clamps 4. Both arc-shaped clamps 4 are slidably connected to the connecting seat 1 in the left-right direction, and a spring 1 that can extend and retract in the left-right direction is provided between the arc-shaped clamps 4 and the connecting seat 1. When the spring 1 is in the free state, there is a gap between the two arc-shaped clamps 4, and the size of the area between the two arc-shaped clamps is larger than the outer diameter of the end of the cable 18 to be assembled, so that the cable 18 can be inserted between the two arc-shaped clamps 4.

[0054] The connecting seat 2 is slidably installed in the grounding box in the front-to-back direction. The connecting seat 2 has a through hole 2 that runs through the front and back, and the through hole 2 is coaxial with the slot 101.

[0055] like Figure 7 As shown, the connecting seat 2 has two through holes 201 arranged at intervals in the left and right directions below the hole 2.

[0056] like Figure 3 As shown, a support frame 10 is connected to the front side of the connecting seat 2 2 and the side of the through hole 201.

[0057] The locking knob 6 is rotated and fitted on the outside of the two arc-shaped clamps 4. The outer side of the locking knob 6 is provided with a ring of anti-slip protrusions.

[0058] like Figure 8 As shown, the one-way limiting structure includes a ratchet 19 and ratchet teeth 23. The ratchet 19 is located in front of the locking knob 6, and the ratchet 19 is coaxial with the locking knob 6 and remains relatively fixed to the locking knob 6. The ratchet 19 is annular, and multiple slots 191 are evenly arranged around its axis on the inner ring of the ratchet 19.

[0059] Multiple ratchet teeth 23 are provided, and the multiple ratchet teeth 23 are evenly distributed around the axis of the slot 101 in the connecting seat 1. Each ratchet tooth 23 is located in the receiving slot 241 on the limiting ring 24. One end of the ratchet tooth 23 is rotatably mounted on the connecting seat 1 around the front-to-back extending rotation axis, and a torsion spring is provided between the ratchet tooth 23 and the connecting seat 1. When the torsion spring is in the free state, the other end of the ratchet tooth 23 extends to the outside of the receiving slot 241 and protrudes outward from the limiting ring 24.

[0060] Ratchet 19 is fitted onto the outside of the limiting ring 24. When ratchet 19 rotates forward, the inclined groove sidewall of the slot 191 on ratchet 19 pushes the ratchet 23, causing the ratchet 23 to rotate into the receiving groove, thus passing over the ratchet 23 and ensuring that ratchet 19 can rotate smoothly forward. When ratchet 19 rotates in reverse, the vertical groove sidewall of the slot 191 on ratchet 19 pushes the ratchet 23 to the outside of the receiving groove 241, and the ratchet 23 blocks the reverse rotation of ratchet 19, thus allowing ratchet 19 to rotate only forward and not in reverse.

[0061] like Figure 2 As shown, the spiral locking component 5 is flexible and made of plastic-coated annealed soft iron wire, bent into a spiral shape. The spiral locking component 5 is fitted onto the outside of the two arc-shaped clamping plates 4, as shown. Figure 3 As shown, the front end of the spiral locking component 5 is connected to the locking knob 6 by a connecting bolt, and the rear end of the spiral locking component 5 is connected to the connecting seat 2 by a connecting bolt.

[0062] like Figure 4 As shown, the push rod 11 extends in the front-to-back direction and is located directly below the screw locking member 5. The push rod 11 and the locking knob 6 are connected by a transmission assembly.

[0063] The rear end of the push rod 11 is connected to a pressure block 16. The pressure block 16 has two pressing ends arranged at left and right intervals, and the two pressing ends are pressed onto the connecting seat 2.

[0064] like Figure 2 , Figure 4 As shown, the front end of the push rod 11 has a guide rod segment 111 with a square cross section. The guide rod segment 111 is inserted into the guide hole 102 on the connecting seat 1, so that the push rod 11 cannot rotate.

[0065] like Figure 5 , Figure 6 As shown, the transmission assembly includes a driving gear 8, a driven gear 17, and a spiral sleeve 20. The driving gear 8 is coaxial with the locking knob 6 and fixedly connected to the front end of the locking knob 6. The aforementioned ratchet 19 is fixedly connected to the front end of the driving gear 8. When the locking knob 6 rotates, it drives the driving gear 8 and the ratchet 19 to rotate synchronously.

[0066] like Figure 6 As shown, a mounting bracket 21 is provided below the drive gear 8 inside the grounding box. The mounting bracket 21 is slidably installed in the grounding box in the vertical direction, and an elastic element 22 is provided between the mounting bracket 21 and the grounding box. The spiral sleeve 20 extends back and forth along its own axis and is rotatably installed on the mounting bracket 21. The front and rear positions of the spiral sleeve 20 on the mounting bracket 21 are relatively fixed. The push rod 11 is spirally inserted into the spiral sleeve 20, and the rear end of the push rod 11 is inserted into the guide hole 102 on the connecting seat 1.

[0067] The driven gear 17 is fixed to the outside of the spiral sleeve 20. When the elastic element 22 is in a free state, the driven gear 17 and the driving gear 8 are in a meshing state.

[0068] When the locking knob 6 is turned, the driving gear 8 drives the driven gear 17 to reverse, the driven gear 17 drives the spiral sleeve 20 to reverse, the spiral sleeve 20 drives the push rod 11 to move backward, the push rod 11 pushes the connecting seat 2 to move backward, one end of the spiral locking part is driven by the locking knob 6 to continue winding around the outside of the two arc-shaped clamps 4 along its direction of rotation, and the other end is pushed by the connecting seat 2 to be stretched. The spiral locking part becomes thin and tightly wound around the outside of the two arc-shaped clamps 4, so that the two arc-shaped clamps 4 are close to each other.

[0069] like Figure 2 As shown, the clamping structure two includes an arc-shaped clamping plate two 7 and a connecting seat three 3.

[0070] like Figure 3 , Figure 4 As shown, there are two arc-shaped clamps 7. The openings of the two arc-shaped clamps 7 are opposite each other and arranged symmetrically from left to right. The two arc-shaped clamps 7 are inserted into the holes 2 on the connecting seat 2. Both arc-shaped clamps 7 are slidably installed on the connecting seat 2 in the left and right direction. A spring 2 is connected between the arc-shaped clamps 7 and the connecting seat 2. When the spring 2 is in the free state, there is a gap between the two arc-shaped clamps 7. The size of the area between the two arc-shaped clamps 7 is larger than the outer diameter of the cable 18.

[0071] The outer wall of the arc-shaped clamp 7 is conical, with the smaller diameter end facing backward.

[0072] Connector 3 is located behind connector 2 and is fixedly installed inside the junction box. Connector 3 has a through hole 3, which is coaxial with hole 2. The diameter of hole 3 is smaller than the outer diameter of the large diameter section of arc-shaped clamp 7. When connector 2 is pushed backward, connector 3 pushes against the outer walls of the two arc-shaped clamps 7, causing the two arc-shaped clamps 7 to come closer together and clamp the cable 18.

[0073] like Figure 5 , Figure 7 As shown, the anti-loosening assembly includes a movable column 12 and an anti-loosening push rod 15.

[0074] The movable column 12 is slidably mounted on the connecting seat 1 in the front-to-back direction, and an elastic element 13 is connected between the movable column 12 and the connecting seat 1. The elastic element 13 can extend and retract in the front-to-back direction, and applies a rearward elastic force to the movable column 12. When the elastic element 13 is in a free state, the movable column 12 is located in the slot 101. A mounting plate 14 is vertically connected to the front end of the movable column 12.

[0075] There are two anti-detachment push rods 15, which are arranged at intervals on the left and right sides and are connected to the mounting plate 14 at their front ends. The front end of the anti-detachment push rod 15 passes through the connecting seat 1 in the front-back direction and is connected to the mounting plate 14. The rear end of the anti-detachment push rod 15 passes through the through hole 201 on the connecting seat 2 in the front-back direction.

[0076] like Figure 7 As shown, a one-way locking structure is provided between the anti-detachment push rod 15 and the connecting seat 2. The one-way locking structure includes a locking block 25 and multiple limiting teeth 151. There are two locking blocks 25, which are arranged symmetrically on the left and right and are located in two through holes 201 respectively. The locking blocks 25 can slide in the left and right direction. A spring 3 9 that can extend and retract in the left and right direction is connected between the locking blocks 25 and the connecting seat 2. A limiting slope 251 is provided on the rear side of the locking blocks 25. The two limiting slopes 251 on the two locking blocks 25 are arranged facing each other and moving away from each other from front to back.

[0077] The limiting teeth 151 are connected to the anti-detachment push rods 15 and are located on the side of the anti-detachment push rods 15 opposite to the other anti-detachment push rod 15. Each anti-detachment push rod 15 has multiple limiting teeth 151 arranged at equal intervals along the front-rear direction connected to its rear section. The front side of each limiting tooth 151 has a pushing slope 152. The pushing slopes 152 on the two opposing limiting teeth 151 on the two anti-detachment push rods 15 move away from each other from front to back.

[0078] The rear section of the anti-detachment push rod 15 passes through two through holes 201 on the connecting seat 2, and the limiting teeth 151 on the anti-detachment push rod 15 face the locking block 25. When the anti-detachment push rod 15 moves from back to front, the limiting teeth 151 push the locking block 25 to the side, thereby moving it forward past the limiting teeth 151. When the anti-detachment push rod 15 moves backward, the limiting teeth 151 push the locking block 25 backward, thereby causing the connecting seat 2 to move backward.

[0079] In use, the operator holds the cable 18 with one hand, inserting the end of the cable 18 sequentially into the area between the two arc-shaped clamps 7 and the area between the two arc-shaped clamps 4. The front end of the cable 18 pushes the movable column 12 forward, opening it. With the other hand, the operator rotates the locking knob 6 clockwise. The locking knob 6 drives the front end of the spiral locking member 5 to rotate in the spiral direction of the spiral locking member 5. At the same time, the driving gear 8 drives the driven gear 17 and the spiral sleeve 20 to rotate. The push rod 11 is driven by the spiral sleeve 20 to move forward. As the connecting seat 2 moves backward, the push rod 11 pushes the connecting seat 2 to move backward. The spiral locking part 5 is wrapped around the outside of the two arc-shaped clamping plates 4 on one side, and the two ends are stretched away from each other, which reduces the inner diameter of the spiral locking part 5. The spiral locking part 5 is tightly wrapped around the outside of the two arc-shaped clamping plates 4, and the two arc-shaped clamping plates 4 move closer to each other. At the same time, when the connecting seat 2 is pushed backward, the connecting seat 3 squeezes the two arc-shaped clamping plates 7, making the two arc-shaped clamping plates 7 move closer to each other, thereby clamping the cable 18 and fixing the cable 18 to the grounding box.

[0080] When the connecting seat 2 is moved backward until the two arc-shaped clamping plates 7 completely clamp the cable 18 and the connecting seat 2 can no longer move backward, the rotational resistance at the driven gear 17 increases. At this time, the pressure at the driving gear 8 and the driven gear 17 can overcome the elastic force of the elastic element 22. The driven gear 17 is pushed down by the driving gear 8. The driving gear 8 no longer drives the driven gear 17 to rotate. The locking knob 6 is turned and continues to rotate forward, thereby driving the front end of the spiral locking element 5 to continue to wrap around the outside of the two arc-shaped clamping plates 4 until the locking knob 6 can no longer rotate. Then the two arc-shaped clamping plates 4 completely clamp the cable 18.

[0081] During subsequent use, when the cable 18 is subjected to a backward pulling force, the connecting seat 2 is dragged backward by the cable 18, which causes the rear end of the spiral locking part 5 to be stretched backward, and the inner diameter of the spiral locking part 5 is further reduced, thereby enhancing the clamping force of the two arc-shaped clamping plates 7 on the cable 18, and having an anti-loosening effect.

[0082] After prolonged use, if cable 18 becomes loose and moves backward, the front end of cable 18 will leave the movable column 12. The movable column 12 will move backward under the action of the elastic element 13, causing the two anti-detachment push rods 15 to move backward. The limiting teeth 151 on the two anti-detachment push rods 15 will push the locking block 25 to move backward, causing the connecting seat 2 to move backward, pulling the spiral locking element 5 backward and reducing the inner diameter of the spiral locking element 5. The two arc-shaped clamps 4 will move closer to each other, and at the same time, the two arc-shaped clamps 7 will be squeezed closer to each other by the connecting seat 3, clamping the cable 18 and preventing the cable 18 from slipping out of the grounding box.

[0083] This invention enables simultaneous clamping of multiple locations on the cable 18 by turning the locking knob 6, improving installation efficiency. It also prevents cable damage caused by concentrated clamping force and provides an anti-loosening effect, making the connection between the cable and the grounding box safer and more reliable.

Claims

1. A double-clamping type power fitting, comprising a clamping structure one and a clamping structure two, characterized in that, The clamping structure includes: a connecting seat 1 for fixed installation inside the grounding box, the connecting seat 1 having a slot; two arc-shaped clamping plates 1 with opposite openings, one end of which passes through the slot and is fixed relative to the connecting seat 1 in the axial direction of the slot, both arc-shaped clamping plates 1 being slidably mounted on the connecting seat 1 along the opening direction; a connecting seat 2 for installation inside the grounding box, located on the side of the arc-shaped clamping plate 1 facing away from the connecting seat 1, the connecting seat 2 having a hole 2 coaxial with the slot, the connecting seat 2 being able to slide along the axial direction of the hole 2; and a locking knob, coaxial with the slot and rotatably mounted on the connecting seat 1, rotatably sleeved on the two arc-shaped clamping plates 1. The outer side of the shaped clamping plate; a one-way limiting structure, located between the locking knob and the connecting seat, is used to lock the reverse-rotating locking knob; a spiral locking component, spirally fitted on the outer side of the two arc-shaped clamping plates, one end connected to the locking knob and the other end connected to the connecting seat, the spiral locking component rotating in the same direction as the locking knob; a push rod, parallel to the slot axis and movable along the length of the rod, is installed in the grounding box, one end of the push rod abutting against the connecting seat, the other end being connected to the locking knob via a transmission assembly, so that when the locking knob rotates forward, the push rod drives the push rod to push the connecting seat away from the connecting seat; The clamping structure two includes: two arc-shaped clamping plates with opposite openings, which are inserted into the hole two and fixed relative to the connecting seat two in the axial direction of the hole two. Both arc-shaped clamping plates are slidably installed on the connecting seat two along the opening direction. The end of the arc-shaped clamping plate two facing away from the connecting seat one extends to the outside of the connecting seat two. The outer wall of the arc-shaped clamping plate two is conical, and the small diameter end faces away from the connecting seat one. The connecting seat three is used to be fixed in the grounding box and is located on the side of the connecting seat two facing away from the connecting seat one. The connecting seat three has a hole three coaxial with the hole two. The small diameter end of the arc-shaped clamping plate two is inserted into the hole three. The inner diameter of the hole three is smaller than the outer diameter of the large diameter end of the arc-shaped clamping plate two. When the connecting seat two is pushed towards the connecting seat three by the push rod, the two arc-shaped clamping plates two are pushed closer to each other by the inner wall of the hole three.

2. The double-clamped power fitting according to claim 1, characterized in that, The one-way limiting structure includes a ratchet and a ratchet tooth. The ratchet is ring-shaped and sleeved on the outer side of two arc-shaped clamps. The ratchet is coaxial with the locking knob and relatively fixed. The ratchet tooth is elastically connected to the connecting seat on a rotation axis parallel to the groove axis. The ratchet tooth is locked in the groove on the ratchet. When the ratchet rotates forward, it can pass over the ratchet tooth. When it rotates in reverse, it is blocked by the ratchet tooth.

3. A double-clamped power fitting according to claim 2, characterized in that, The transmission assembly includes a spiral sleeve, a driving gear, and a driven gear. The spiral sleeve is rotatably mounted in the grounding box about a rotation axis parallel to the groove axis. The push rod is guided and slidably mounted in the grounding box along the axial direction of the spiral sleeve. The push rod spirally passes through the spiral sleeve. The driving gear is coaxial with the locking knob and relatively fixed. The driven gear is sleeved on the outside of the spiral sleeve to prevent rotation. The driving gear and the driven gear mesh.

4. A double-clamped power fitting according to claim 3, characterized in that, The spiral sleeve is radially movable inside the grounding box. An elastic element is provided between the spiral sleeve and the grounding box. When the elastic element is in a free state, the driving gear and the driven gear mesh.

5. A double-clamped power fitting according to any one of claims 1-4, characterized in that, The spiral locking element is detachably connected between the connecting seat and the locking knob.

6. A double-clamped power fitting according to any one of claims 1-4, characterized in that, Connecting seat 1 has a movable column coaxial with the slot. The movable column is slidably installed on connecting seat 1 along the axial direction. There is an elastic element 2 between the movable column and connecting seat 1. The elastic element 2 applies an elastic force to the movable column toward connecting seat 2. When the elastic element 2 is in a free state, the connecting column passes through the slot. There is an anti-detachment push rod between connecting seat 1 and connecting seat 2. The anti-detachment push rod is slidably installed on connecting seat 1 and connecting seat 2 along a direction parallel to the slot axis. The anti-detachment push rod is connected to the movable column. There is a one-way locking structure between the anti-detachment push rod and connecting seat 2. The one-way locking structure prevents the movement of the anti-detachment push rod toward connecting seat 2.

7. A double-clamped power fitting according to claim 6, characterized in that, The one-way locking structure includes a locking block and multiple limiting teeth. The connecting seat 2 has a through hole. The locking block is located in the through hole and is elastically slidably mounted on the connecting seat 2. The locking block has a limiting slope on the side facing away from the connecting seat 1. Multiple limiting teeth are arranged at intervals on the anti-detachment rod along the rod length direction. The limiting teeth have a pushing slope on the side facing the connecting seat 1. The anti-detachment rod passes through the through hole, and the pushing slope fits against the limiting slope.

8. A double-clamped type power fitting according to any one of claims 1-4, characterized in that, One end of the push rod facing the second connecting seat is connected to a pressure block. The pressure block has two horizontally spaced pressing ends, which press against the second connecting seat.

9. A double-clamped type power fitting according to any one of claims 1-4, characterized in that, The outer wall of the locking knob has a ring of anti-slip protrusions.

Images