A power cable laying device

Abstract

The present invention discloses a power cable pay-off device, which comprises a pay-off mechanism and a reverse prevention mechanism; the pay-off mechanism includes a pay-off mechanism frame provided with a lifting platform, and a cable reel is rotatably arranged on the lifting platform; the reverse prevention mechanism includes a reverse prevention mechanism base, and a first guide seat, a reverse prevention structure, a reverse prevention trigger structure and a second guide seat are arranged in the reverse prevention mechanism base. Guide rollers matching the outer diameter of the cable are rotatably arranged in both the first guide seat and the second guide seat. The reverse prevention structure includes a reverse prevention structure housing, and a cable accommodation cavity with inclined surfaces formed by inward contraction of the left and right rear side surfaces is arranged in the reverse prevention structure housing. Cable clamping wedges are slidably arranged on the left and right sides in the cable accommodation cavity respectively, and a cable clamping wedge limit structure is arranged on the outer side of the cable clamping wedge. The present invention can effectively prevent the reverse slipping phenomenon of the cable during the pay-off work.

Description

Technical Field

[0001] The present invention relates to the field of power line installation, and particularly to a power cable pay-off device. Background Art

[0002] At present, in power construction operations, a cable winder is a commonly used pay-off and take-up device for cooperating with the pay-off and take-up work during cable erection. However, due to the large volume of the existing cable winder, its use is greatly affected by the site. In many cases, manual dragging is still used for pay-off work, such as in the cable laying work in a cable trench. Due to many accidental factors in manual pay-off work, the phenomenon of reverse slippage of the cable is extremely likely to occur, bringing great potential safety hazards and easily triggering safety accidents. Summary of the Invention

[0003] The purpose of the present invention is to provide a power cable pay-off device that can be applicable to various actual use occasions, can effectively prevent the reverse slippage of the cable during pay-off work, eliminate potential safety hazards, and is applicable to various relatively narrow spaces.

[0004] The present invention adopts the following technical solutions:

[0005] A power cable pay-off device includes a pay-off mechanism and a reverse prevention mechanism;

[0006] The pay-off mechanism includes a pay-off mechanism frame, on which a lifting platform is arranged. A cable reel is rotatably arranged on the lifting platform, and the cable is wound around the cable reel;

[0007] The reverse prevention mechanism includes a reverse prevention mechanism base. From back to front, a first guide seat, a reverse prevention structure, a reverse prevention trigger structure, and a second guide seat are sequentially arranged in the reverse prevention mechanism base. Guide rollers matching the outer diameter of the cable are rotatably arranged in both the first guide seat and the second guide seat. The reverse prevention structure includes a reverse prevention structure housing, in which a cable accommodation cavity with inclined surfaces formed by inward contraction of the left and right rear sides is arranged. Cable clamping wedges are slidably arranged on the left and right in the cable accommodation cavity. A cable clamping wedge limiting structure is arranged outside the cable clamping wedges. Before the cable clamping wedge limiting structure is released from the limit, the cable clamping wedges do not clamp the cable; after the cable clamping wedge limiting structure is released from the limit, the cable clamping wedges clamp the cable, and when the cable moves backward, the cable clamping wedges move backward to lock the cable, and the movement of the cable is restricted by the inclined surfaces on the left and right sides at the rear end of the cable accommodation cavity; A unidirectionally rotating clamping roller is rotatably arranged up and down in the reverse prevention trigger structure. When the cable moves backward, the cable drives one clamping roller to move backward, and the clamping roller drives the cable clamping wedge limiting structure to release the limit through a triggering device.

[0008] On the upper surface of the check valve structure housing, there is a cable accommodation cavity that is open on both the front and rear sides. The inner diameters of the openings on both the front and rear sides of the cable accommodation cavity are larger than the outer diameter of the cable. On the left and right sides of the rear part of the cable accommodation cavity, both sides contract inward to form inclined surfaces. On both sides of the rear part of the cable accommodation cavity, there are cable clamping wedge block chutes arranged along the front-rear direction. The left and right cable clamping wedge blocks are both trapezoidal blocks. The inclined surfaces of the cable clamping wedge blocks match the slopes of the inclined surfaces at the rear part of the cable accommodation cavity. On the inclined surfaces of both cable clamping wedge blocks, there are cable clamping wedge block sliding rods. The cable clamping wedge blocks are slidably connected to the check valve structure housing through the cable clamping wedge block sliding rods and the cable clamping wedge block chutes, and the outer ends of the cable clamping wedge block sliding rods protrude outside the left and right sides of the check valve structure housing. On the side surface of the cable clamping wedge block opposite to the inclined surface, there is an arc-shaped cable accommodation groove opened.

[0009] The cable clamping wedge block limiting structure includes a clamping groove arranged along the circumferential direction on the outer circumferential surface of the outer end of the cable clamping wedge block sliding rod. On the outer surfaces of the left and right sides of the check valve structure housing, there are clamping plates. The middle of the clamping plate is rotatably connected to the check valve structure housing through a rotating shaft. A limiting portion is vertically arranged at the upper end of the clamping plate, and the limiting portion is clamped with the clamping groove. When the lower end of the clamping plate is driven backward, the limiting portion at the upper end of the clamping plate is separated from the clamping groove. On the front surfaces of both cable clamping wedge blocks, there are spring installation columns. A wedge block driving spring is sleeved on the spring installation columns. The front end of the wedge block driving spring is connected to the spring installation plate at the front opening of the cable accommodation cavity. Before the limiting structure releases the limiting action, the wedge block driving spring is in a compressed state, and the limiting portion at the upper end of the clamping plate is clamped in the clamping groove.

[0010] The check valve triggering structure includes a check valve triggering housing. Inside the check valve triggering housing, a first clamping roller and a second clamping roller are respectively arranged up and down. The rotating shafts at both ends of the first clamping roller and the second clamping roller are fixedly connected to the inner ring of the one-way check bearing. On the lower parts of the left and right side housings of the check valve triggering housing, there are lower bearing horizontal sliding grooves horizontally arranged. A lower bearing seat is slidably arranged in the lower bearing horizontal sliding groove. The outer ring of the one-way check bearing installed with the second clamping roller is fixedly connected to the lower bearing seat.

[0011] On the front end of the outer surface of the lower bearing seat, there is a first spring connection column. On the outer surface of the check valve triggering housing in front of the lower bearing horizontal sliding groove, there is a second spring connection column. A bearing seat driving spring is arranged between the first spring connection column and the second spring connection column. When the lower bearing seat is located at the frontmost position of the lower bearing horizontal sliding groove, the bearing seat driving spring is in a stretched state.

[0012] The described triggering device includes a triggering link horizontally arranged at the rear of the outer surface of the lower bearing seat. A link drive shaft long hole is arranged along the length direction of the lower part of the clamping plate. The link drive shaft is arranged in the link drive shaft long hole. The front end of the triggering link is fixedly connected to the rear of the outer surface of the lower bearing seat, and the rear end of the triggering link is connected to the lower part of the clamping plate through the link drive shaft and the link drive shaft long hole.

[0013] On the upper parts of the left and right side shells of the anti-reverse trigger housing, upper bearing vertical sliding grooves are arranged up and down. An upper bearing seat is slidably arranged in the upper bearing vertical sliding grooves. The outer ring of the one-way anti-reverse bearing on which the first clamping roller is installed is fixedly connected to the upper bearing seat. Threaded holes communicating with the upper bearing vertical sliding grooves are arranged on the left and right sides of the upper surface of the anti-reverse trigger housing. A threaded rod is arranged in the threaded holes. The lower end of the threaded rod is rotatably connected to the upper end of the upper bearing seat.

[0014] The described wire pay-off mechanism frame includes a left wire pay-off machine support and a right wire pay-off machine support that are symmetrically arranged left and right and have the same structure. The left wire pay-off machine support includes a support base, a support top seat, a lifting support column group, and a stabilizing support column. The lifting support column group includes two support columns arranged front and rear between the support base and the support top seat. A number of pin holes are evenly arranged up and down on both support columns. The lifting platform includes a fixed plate, a lifting plate, and a hydraulic cylinder. Sleeves matching the support columns are fixedly arranged at both ends of the fixed plate and the lifting plate. The fixed plate and the lifting plate are slidably connected to the lifting support column group through the sleeves. The fixed plate and the lifting plate are arranged on the lifting support column group through fixed pins and pin holes. The bottom end of the hydraulic cylinder is arranged on the upper surface of the fixed plate, and the movable end of the hydraulic cylinder is arranged on the lower surface of the lifting plate. The hydraulic cylinder drives the lifting plate to move up and down along the lifting support column group; a wire reel rotating shaft support device is arranged on the upper surface of the lifting plate. The wire reel rotating shaft is arranged in the wire reel rotating shaft support device; A number of stabilizing support columns are arranged between the support base and the support top seat outside the lifting support column group.

[0015] The lower part of the front end of the described wire pay-off mechanism frame is detachably connected to an anti-reverse mechanism mounting seat. The anti-reverse mechanism base and the anti-reverse mechanism mounting seat are detachably connected. A support leg is arranged at the front end of the anti-reverse mechanism mounting seat.

[0016] The described first guide seat, anti-reverse structure, anti-reverse trigger structure, and second guide seat are detachably connected to the anti-reverse mechanism base.

[0017] The present invention adopts a left wire pay-off machine bracket and a right wire pay-off machine bracket that are symmetrically arranged on the left and right and have the same structure to support the cable reel; a lifting platform is used to lift the cable reel so that its lower end is separated from the ground to achieve rotation. The present invention designs a reverse prevention structure with a special mechanism. A trapezoidal cable clamping wedge is used to hold the retracting cable tightly, and the left and right inclined planes on the rear end of the cable accommodating cavity limit the movement of the cable, effectively increasing the contact area between the cable clamping wedge and the cable. It can not only prevent the cable from continuing to retract, but also avoid the large squeezing force on the cable that is likely to damage the core inside the cable; the present invention also designs a reverse prevention trigger structure installed with a one-way reverse bearing. Firstly, it can play a certain reverse prevention effect in the first place; secondly, it can drive the limit release of the cable clamping wedge limit structure, thereby realizing the action of the first reverse prevention structure; finally, it can also play a certain role in straightening the cable during wire pay-off. The present invention can effectively prevent the reverse slippage of the cable during wire pay-off work and eliminate potential safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the right wire pay-off machine bracket in the present invention;

[0019] Figure 2 It is a schematic structural diagram of the first guide seat in the present invention;

[0020] Figure 3 It is a schematic structural diagram of the reverse prevention structure housing in the present invention;

[0021] Figure 4 It is a schematic structural diagram of the left and right cable clamping wedges in the present invention;

[0022] Figure 5 It is a schematic structural diagram of the reverse prevention trigger structure in the present invention;

[0023] Figure 6 It is a schematic connection diagram of the reverse prevention structure and the reverse prevention trigger structure in the present invention;

[0024] Figure 7 It is a schematic diagram of the positional relationship when the clamping plate is clamped with the card slot on the outer circumferential surface of the outer end of the cable clamping wedge slide bar;

[0025] Figure 8 It is a schematic diagram of the positional relationship between the clamping plate and the card slot on the outer circumferential surface of the outer end of the cable clamping wedge slide bar when the clamping plate moves backward;

[0026] Figure 9 It is a schematic diagram of the positional relationship when the clamping plate is completely separated from the card slot on the outer circumferential surface of the outer end of the cable clamping wedge slide bar. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The present invention will be described in detail below with reference to the drawings and embodiments:

[0028] AsFigures 1 to 9 As shown in the figure, the power cable pay-off device of the present invention includes a pay-off mechanism and a reverse prevention mechanism;

[0029] The pay-off mechanism includes a pay-off mechanism frame 1. A lifting platform is arranged on the pay-off mechanism frame 1. A cable reel 2 is rotatably arranged on the lifting platform, and the cable is wound around the cable reel 2. When the present invention is in use, after the pay-off mechanism frame 1 is set to the designated use position, the cable reel 2 wound with the cable is installed on the pay-off mechanism frame 1 through the lifting platform, and then the reverse prevention mechanism is installed and the pay-off work is carried out. The pay-off mechanism frame 1 is used to achieve a supporting effect, and the lifting platform is used to lift the cable reel 2 so that its lower end is separated from the ground to achieve rotation, which is applicable to various actual application occasions to meet the use requirements such as space and outdoor harsh environments, and has strong general performance. The reverse prevention mechanism is used to prevent the cable from slipping back.

[0030] In the present invention, the pay-off mechanism frame 1 includes a left pay-off machine support and a right pay-off machine support that are symmetrically arranged left and right and have the same structure. The left pay-off machine support includes a support base 3, a support top seat 4, a lifting pillar group and a stabilizing pillar 5. The lifting pillar group includes two support pillars 6 arranged front and back between the support base 3 and the support top seat 4. A number of pin holes 7 are evenly arranged up and down on both of the two support pillars 6. The lifting platform includes a fixing plate 8, a lifting plate 9 and a hydraulic cylinder 10. Sleeves 11 matching the support pillars 6 are fixedly arranged at both ends of the fixing plate 8 and the lifting plate 9. The fixing plate 8 and the lifting plate 9 are slidably connected to the lifting pillar group through the sleeves 11. The bottom end of the hydraulic cylinder 10 is arranged on the upper surface of the fixing plate 8, and the movable end of the hydraulic cylinder 10 is arranged on the lower surface of the lifting plate 9. The hydraulic cylinder 10 drives the lifting plate 9 to move up and down along the lifting pillar group. When the fixing plate 8 and the lifting plate 9 reach the set position, the fixing plate 8 and the lifting plate 9 are arranged on the lifting pillar group through a fixing pin 12 and the pin holes 7. A cable reel rotating shaft support device is arranged on the upper surface of the lifting plate 9, and the cable reel rotating shaft 13 is arranged in the cable reel rotating shaft support device to achieve the support of the cable reel 2. The cable reel rotating shaft support device can adopt two rotating rollers 14 arranged in parallel, and the lower left and right sides of the cable reel rotating shaft 13 are respectively arranged on the two rotating rollers 14. A number of stabilizing pillars 5 are arranged between the support base 3 and the support top seat 4 outside the lifting pillar group to ensure the structural stability of the left pay-off machine support.

[0031] When assembling the wire pay-off mechanism and the cable reel 2, first set the left wire pay-off machine bracket and the right wire pay-off machine bracket at the designated use position. To ensure its stability, the support base 3 can be fixed to the ground using a fixing device. Then, according to the outer diameter of the cable reel 2, adjust the height of the fixing plate 8, and make the fixing plate 8 stable through the fixing pin 12 and the pin hole 7. Then, push the cable reel 2 between the left wire pay-off machine bracket and the right wire pay-off machine bracket, insert the cable reel rotating shaft 13 into the bearing seat in the middle of the cable reel 2, and make both ends of the cable reel rotating shaft 13 located above the lifting plates 9 of the left wire pay-off machine bracket and the right wire pay-off machine bracket respectively. Then, control the hydraulic cylinder 10 to work to raise the lifting plate 9, and lift the cable reel rotating shaft 13 through the cable reel rotating shaft support device until the lower end of the cable reel 2 is separated from the ground. Subsequently, use the fixing pin 12 and the pin hole 7 to make the position of the lifting plate 9 stable. The hydraulic rod and the fixing pin 12 can effectively ensure the stable support of the cable reel rotating shaft 13.

[0032] In the present invention, the anti-reverse mechanism includes an anti-reverse mechanism base. Inside the anti-reverse mechanism base, from the back to the front (from the incoming line direction, i.e., the position of the cable reel 2, to the outgoing line direction), a first guide seat 15, an anti-reverse structure 16, an anti-reverse trigger structure 17, and a second guide seat are sequentially arranged. In both the first guide seat 15 and the second guide seat, a guide roller 18 matching the outer diameter of the cable is rotatably arranged. The first guide seat 15 and the second guide seat have the same structure, and the guide roller 18 is used to guide the cable to run in a straight line direction, ensuring that the cable passes through the anti-reverse structure 16 and the anti-reverse trigger structure 17 in the correct posture.

[0033] Some existing wire pay-off anti-reverse devices use an eccentric pendulum wheel to achieve anti-reverse. However, since the contact area between the lower end surface of the eccentric pendulum wheel and the cable is small, if only the eccentric pendulum wheel is used to stop the backward movement of the cable, on the one hand, if the backward force of the cable is too large (such as when the cable reel 2 suddenly rotates), the anti-reverse effect will be poor, and the cable may continue to move backward. On the other hand, the relatively large extrusion force of the eccentric pendulum wheel on the cable is extremely likely to damage the wire core inside the cable, resulting in the cable being unable to work properly and being difficult to troubleshoot, which is likely to cause potential safety hazards. Therefore, the present invention designs an anti-reverse structure 16 with a special structure.

[0034] The anti-reverse structure 16 includes an anti-reverse structure housing 19. Inside the anti-reverse structure housing 19, a cable accommodation cavity 20 is provided, and the left and right sides of the rear part of the cable accommodation cavity 20 are both inwardly contracted to form inclined surfaces. Cable clamping wedges 21 are slidably arranged on the left and right sides of the cable accommodation cavity 20 respectively. A cable clamping wedge limit structure is arranged outside the cable clamping wedges 21. Before the cable clamping wedge limit structure is released from the limit, the cable clamping wedges 21 do not clamp the cable; after the cable clamping wedge limit structure is released from the limit, the cable clamping wedges 21 clamp the cable, and when the cable moves backward, the cable clamping wedges 21 move backward to lock the cable, and the movement of the cable is restricted by the inclined surfaces on the left and right sides at the rear end of the cable accommodation cavity 20.

[0035] In the present invention, on the upper surface of the check valve structure housing 19, there is a cable accommodating cavity 20 that is open on both the front and rear sides. The inner diameters of the openings on both the front and rear sides of the cable accommodating cavity 20 are larger than the outer diameter of the cable, facilitating the passage of the cable. On the left and right side surfaces of the rear part of the cable accommodating cavity 20, they both contract inward to form inclined surfaces 21. On both sides of the rear part of the cable accommodating cavity 20, there are cable clamping wedge block chutes 22 arranged along the front-rear direction. The left and right cable clamping wedge blocks 21 are both trapezoidal blocks. The slope of the inclined surface 23 of the cable clamping wedge block 21 matches the slope of the inclined surface 21 at the rear part of the cable accommodating cavity 20. On the inclined surfaces of both cable clamping wedge blocks 21, there are cable clamping wedge block slide rods 24. The cable clamping wedge blocks 21 are slidably connected to the check valve structure housing 19 through the cable clamping wedge block slide rods 24 and the cable clamping wedge block chutes 22, and the outer ends of the cable clamping wedge block slide rods 24 protrude outside the left and right sides of the check valve structure housing 19. On the surface of the cable clamping wedge block 21 opposite to the inclined surface 23, there is an arc-shaped cable accommodating groove 25. It is possible to contact the cable with the larger-area cable accommodating groove 25, and use the backward movement of the cable to drive the cable clamping wedge block 21, and then use the inclined surface to drive the cable clamping wedge block 21 to automatically clamp the cable to prevent backward movement.

[0036] In this embodiment, the cable clamping wedge block limiting structure includes a clamping groove 26 arranged on the outer circumferential surface of the outer end of the cable clamping wedge block slide rod 24 along the circumferential direction. On the outer surfaces of the left and right sides of the check valve structure housing 19, there are clamping plates 27. The middle of the clamping plate 27 is rotatably connected to the check valve structure housing 19 through a rotating shaft. A limiting portion 28 is vertically arranged at the upper end of the clamping plate 27, and the limiting portion 28 is engaged with the clamping groove 26. When the lower end of the clamping plate 27 is driven backward, the limiting portion 28 at the upper end of the clamping plate 27 is separated from the clamping groove 26. On the front surfaces of both cable clamping wedge blocks 21, there are spring installation columns 29. A wedge block driving spring 30 is sleeved on the spring installation columns 29. The front end of the wedge block driving spring 30 is connected to a spring installation plate 31 at the front end opening of the cable accommodating cavity 20. Before the limiting structure releases the limiting action, the wedge block driving spring 30 is in a compressed state, and the limiting portion 28 at the upper end of the clamping plate 27 is engaged in the clamping groove 26. When the cable clamping wedge block limiting structure releases the limit, that is, when the lower end of the clamping plate 27 is driven backward to separate the limiting portion 28 at the upper end of the clamping plate 27 from the clamping groove 26, at this time, under the action of the wedge block driving spring 30, the cable clamping wedge block 21 quickly moves backward to clamp the cable, and then drives the cable clamping wedge block 21 through the backward movement of the cable, and uses the inclined surface to drive the cable clamping wedge block 21 to automatically clamp the cable to prevent backward movement. The check valve structure 16 can increase the contact area with the cable, minimize the damage to the cable as much as possible, and at the same time use the inclined surface to achieve clamping and preventing backward movement, preventing the drawbacks brought by relying solely on the eccentric swing wheel to prevent backward movement.

[0037] In the present invention, a one-way rotating clamping roller is rotatably arranged up and down inside the anti-reverse trigger structure 17. When the cable moves backward, the cable drives one clamping roller to move backward, and the backward moving clamping roller drives the cable clamping wedge limiting structure to release the limit through the trigger device. The anti-reverse trigger structure 17 has three functions in total: First, it can play a certain anti-reverse effect in the first place; Second, it can drive the cable clamping wedge limiting structure to release the limit, so as to realize the action of the anti-reverse structure 16; Finally, it can also play a certain role in straightening the cable during cable laying.

[0038] In this embodiment, the anti-reverse trigger structure 17 includes an anti-reverse trigger housing 32. Inside the anti-reverse trigger housing 32, a first clamping roller 33 and a second clamping roller 34 are respectively arranged up and down. The rotating shafts at both ends of the first clamping roller 33 and the second clamping roller 34 are fixed to the inner ring of the one-way anti-reverse bearing 35. Lower bearing horizontal sliding grooves 36 are horizontally arranged at the lower parts of the left and right side casings of the anti-reverse trigger housing 32. A lower bearing seat 37 is slidably arranged in the lower bearing horizontal sliding grooves 36. The outer ring of the one-way anti-reverse bearing 35 installed by the second clamping roller 34 is fixedly connected to the lower bearing seat 37. The one-way anti-reverse bearing 35 has the function of restricting one-way rotation and can achieve instant locking during reverse rotation. The one-way anti-reverse bearing 35 is a commercially available product and will not be elaborated here. Considering that the surface insulating layer of the cable has a certain elasticity, the distance between the first clamping roller 33 and the second clamping roller 34 can be about 0.3 cm less than the outer diameter of the cable, which can not only damage the cable but also straighten the cable by using the first clamping roller 33 and the second clamping roller 34.

[0039] Since the distance between the first clamping roller 33 and the second clamping roller 34 is adapted to the outer diameter of the cable, when the cable slips backward in the reverse direction, the first clamping roller 33 and the second clamping roller 34 are simultaneously locked, and the fastest anti-reverse effect can be achieved.

[0040] To ensure the normal operation of the anti-reverse trigger structure 17 during cable outlet, a first spring connection column 38 is arranged at the front end of the outer surface of the lower bearing seat 37, and a second spring connection column 39 is arranged on the outer surface of the anti-reverse trigger housing 32 in front of the lower bearing horizontal sliding groove 36. A bearing seat driving spring 40 is arranged between the first spring connection column 38 and the second spring connection column 39. When the lower bearing seat 37 is located at the forefront of the lower bearing horizontal sliding groove 36, the bearing seat driving spring 40 is in a stretched state. The acting force of the bearing seat driving spring 40 offsets the backward acting force generated by the cable on the second clamping roller 34 during cable outlet. At the same time, by adjusting the elastic force of the bearing seat driving spring 40, the reaction speed of the anti-reverse trigger structure 17 can be adjusted.

[0041] Since the outer ring of the one-way non-return bearing 35 installed on the second clamping roller 34 is fixed to the lower bearing seat 37, and the lower bearing seat 37 is slidably arranged in the lower bearing horizontal sliding groove 36, when the cable continues to move backward overcoming the clamping force of the first clamping roller 33 and the second clamping roller 34 and the elastic force of the bearing seat driving spring 40, the cable moving backward will drive the lower bearing seat 37 to move backward, thereby driving the limit structure to release the limit and triggering the action of the non-return structure 16.

[0042] In the present invention, the triggering device includes a triggering link 41 horizontally arranged at the rear part of the outer surface of the lower bearing seat 37. A link driving shaft long hole 43 is arranged along the length direction of the lower part of the clamping plate 27. The link driving shaft 42 is arranged in the link driving shaft long hole 43. The front end of the triggering link 41 is fixedly connected to the rear part of the outer surface of the lower bearing seat 37, and the rear end of the triggering link 41 is connected to the lower part of the clamping plate 27 through the link driving shaft 42 and the link driving shaft long hole 43. When the lower bearing seat 37 moves backward, the triggering link 41 drives the lower end of the clamping plate 27 to move backward, thereby driving the limiting part 28 at the upper end of the clamping plate 27 to move forward and separate from the clamping groove 26, realizing the release of the limit, and thus making the non-return structure 16 act.

[0043] Considering that the outer diameters of different cables are inconsistent, in the present invention, upper bearing vertical sliding grooves 44 are vertically arranged on the upper parts of the left and right side shells of the non-return triggering housing 32. An upper bearing seat 45 is slidably arranged in the upper bearing vertical sliding grooves 44. The outer ring of the one-way non-return bearing 35 installed on the first clamping roller 33 is fixedly connected to the upper bearing seat 45. Threaded holes communicating with the upper bearing vertical sliding grooves 44 are arranged on the left and right sides of the upper surface of the non-return triggering housing 32. A threaded rod 46 is arranged in the threaded holes. The lower end of the threaded rod 46 is rotatably connected to the upper end of the upper bearing seat 45. By rotating the threaded rod 46, the height of the first clamping roller 33 can be adjusted to improve the versatility of the present invention.

[0044] During the wire paying-off process of the present invention, the wire on the wire reel 2 enters the first guide seat 15 from below. To ensure that the wire can enter the anti-reverse structure 16 horizontally, a lower part at the front end of the wire paying-off mechanism frame 1 is detachably connected with an anti-reverse mechanism mounting seat 47, and the height can be adjusted, such as by using pin holes or bolts for fixation. The anti-reverse mechanism base and the anti-reverse mechanism mounting seat 47 are detachably connected. A support leg 48 is provided at the front end of the anti-reverse mechanism mounting seat 47, and the height of the support leg 48 is adjustable, which can be realized by using existing structures such as telescopic legs. Through the installation of the anti-reverse mechanism base and the anti-reverse mechanism mounting seat 47, it not only ensures the stable connection between the anti-reverse mechanism and the wire paying-off mechanism frame 1, but also ensures that the wire output from the wire reel 2 is horizontal when entering the first guide seat 15, the anti-reverse structure 16, the anti-reverse trigger structure 17 and the second guide seat, improving the anti-reverse effect. The first guide seat 15, the anti-reverse structure 16, the anti-reverse trigger structure 17 and the second guide seat are detachably connected with the anti-reverse mechanism base, which is convenient for better maintenance or adjustment.

Claims

1. A power cable pay-off device, characterized in that: It includes a wire pay-off mechanism and a backstop mechanism; The wire pay-off mechanism includes a wire pay-off mechanism frame, on which a lifting platform is arranged. A cable reel is rotatably arranged on the lifting platform, and the cable is wound around the cable reel; The backstop mechanism includes a backstop mechanism base. From back to front, a first guide seat, a backstop structure, a backstop trigger structure and a second guide seat are sequentially arranged in the backstop mechanism base. Guide rollers matching the outer diameter of the cable are rotatably arranged in both the first guide seat and the second guide seat. The backstop structure includes a backstop structure housing, and a cable accommodating cavity with inclined surfaces formed by inward contraction of the left and right side surfaces at the rear is arranged in the backstop structure housing. Cable clamping wedges are slidably arranged on the left and right in the cable accommodating cavity. A cable clamping wedge limiting structure is arranged outside the cable clamping wedges. Before the cable clamping wedge limiting structure is released from the limit, the cable clamping wedges do not clamp the cable; after the cable clamping wedge limiting structure is released from the limit, the cable clamping wedges clamp the cable, and when the cable moves backward, the cable clamping wedges move backward to lock the cable, and the movement of the cable is restricted by the inclined surfaces on the left and right sides at the rear end of the cable accommodating cavity; In the backstop trigger structure, a unidirectionally rotating clamping roller is rotatably arranged up and down. When the cable moves backward, the cable drives one clamping roller to move backward, and the clamping roller drives the cable clamping wedge limiting structure to release the limit through a triggering device; The lower part of the front end of the wire pay-off mechanism frame is detachably connected with a backstop mechanism mounting seat. The backstop mechanism base and the backstop mechanism mounting seat are detachably connected, and support legs are arranged at the front end of the backstop mechanism mounting seat; The first guide seat, the backstop structure, the backstop trigger structure and the second guide seat are detachably connected to the backstop mechanism base.

2. The power cable laying device according to claim 1, characterized in that: On the upper surface of the backstop structure housing, a cable accommodating cavity with both front and rear openings is arranged. The inner diameters of the front and rear openings of the cable accommodating cavity are both larger than the outer diameter of the cable; the left and right side surfaces at the rear of the cable accommodating cavity both inwardly contract to form inclined surfaces. Cable clamping wedge chutes are respectively arranged along the front-rear direction on both sides at the rear of the cable accommodating cavity. The left and right cable clamping wedges are both trapezoidal blocks. The slopes of the inclined surfaces of the cable clamping wedges match the slopes of the inclined surfaces at the rear of the cable accommodating cavity. Cable clamping wedge sliding rods are arranged on the inclined surfaces of both cable clamping wedges. The cable clamping wedges are slidably connected to the backstop structure housing through the cable clamping wedge sliding rods and the cable clamping wedge chutes, and the outer ends of the cable clamping wedge sliding rods protrude outside the left and right sides of the backstop structure housing; an arc-shaped cable accommodating groove is formed on the surface of the cable clamping wedge opposite to the inclined surface.

3. The power cable pay-off device according to claim 2, wherein: The described cable clamping wedge limit structure includes a card slot provided on the circumferential surface of the outer end of the cable clamping wedge slide rod along the circumferential direction. Card plates are provided on the outer surfaces of the left and right sides of the anti-reverse structure housing. The middle of the card plate is rotationally connected to the anti-reverse structure housing through a rotating shaft. A limit portion is vertically provided at the upper end of the card plate, and the limit portion is engaged with the card slot. When the lower end of the card plate is driven backward, the limit portion at the upper end of the card plate is separated from the card slot. Spring mounting posts are provided on the front surfaces of both cable clamping wedges. A wedge driving spring is sleeved on the spring mounting posts. The front end of the wedge driving spring is connected to the spring mounting plate at the front opening of the cable accommodating cavity. Before the limit release action of the limit structure, the wedge driving spring is in a compressed state, and the limit portion at the upper end of the card plate is engaged in the card slot.

4. The power cable laying device according to claim 3, characterized in that: The described anti-reverse trigger structure includes an anti-reverse trigger housing. A first clamping roller and a second clamping roller are respectively provided in the upper and lower parts of the anti-reverse trigger housing. The rotating shafts at both ends of the first clamping roller and the second clamping roller are fixedly connected to the inner ring of the one-way anti-reverse bearing. Lower bearing horizontal sliding grooves are horizontally provided at the lower parts of the left and right side housings of the anti-reverse trigger housing. A lower bearing seat is slidably provided in the lower bearing horizontal sliding groove. The outer ring of the one-way anti-reverse bearing installed with the second clamping roller is fixedly connected to the lower bearing seat.

5. The power cable pay-off device according to claim 4, characterized in that: A first spring connection post is provided on the front outer surface of the lower bearing seat. A second spring connection post is provided on the outer surface of the anti-reverse trigger housing in front of the lower bearing horizontal sliding groove. A bearing seat driving spring is provided between the first spring connection post and the second spring connection post. When the lower bearing seat is located at the forefront of the lower bearing horizontal sliding groove, the bearing seat driving spring is in a stretched state.

6. The power cable laying device according to claim 5, characterized in that: The described trigger device includes a trigger link horizontally provided at the rear of the outer surface of the lower bearing seat. A long hole for the link driving shaft is provided along the length direction of the lower part of the card plate. The link driving shaft is provided in the long hole for the link driving shaft. The front end of the trigger link is fixedly connected to the rear of the outer surface of the lower bearing seat. The rear end of the trigger link is connected to the lower part of the card plate through the link driving shaft and the long hole for the link driving shaft.

7. The power cable laying device according to claim 6, wherein: Upper bearing vertical sliding grooves are vertically provided at the upper parts of the left and right side housings of the anti-reverse trigger housing. An upper bearing seat is slidably provided in the upper bearing vertical sliding groove. The outer ring of the one-way anti-reverse bearing installed with the first clamping roller is fixedly connected to the upper bearing seat. Threaded holes communicating with the upper bearing vertical sliding groove are provided on both sides of the upper surface of the anti-reverse trigger housing. Threaded rods are provided in the threaded holes. The lower end of the threaded rod is rotationally connected to the upper end of the upper bearing seat.

8. The power cable laying device according to claim 1, wherein: The described wire pay-off mechanism frame includes a left wire pay-off machine bracket and a right wire pay-off machine bracket which are symmetrically arranged left and right and have the same structure. The left wire pay-off machine bracket includes a support base, a support top seat, a lifting pillar group and a stabilizing pillar. The lifting pillar group includes two support pillars arranged front and back between the support base and the support top seat. A number of pin holes are evenly arranged up and down on both of the two support pillars. The lifting platform includes a fixed plate, a lifting plate and a hydraulic cylinder. Sleeves matching the support pillars are fixedly arranged at both ends of the fixed plate and the lifting plate. The fixed plate and the lifting plate are slidably connected to the lifting pillar group through the sleeves. The fixed plate and the lifting plate are arranged on the lifting pillar group through fixing pins and pin holes. The bottom end of the hydraulic cylinder is arranged on the upper surface of the fixed plate, and the movable end of the hydraulic cylinder is arranged on the lower surface of the lifting plate. The hydraulic cylinder drives the lifting plate to move up and down along the lifting pillar group; a wire reel rotating shaft support device is arranged on the upper surface of the lifting plate, and the wire reel rotating shaft is arranged inside the wire reel rotating shaft support device; a number of stabilizing pillars are arranged between the support base and the support top seat outside the lifting pillar group.

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