Wire tightening device for power construction

Abstract

A wire tightening device for power construction comprises a bottom plate. The bottom plate is provided with a wire spool driven by a rotating piece, and automatic wire tightening is carried out. A sliding resistor is arranged on the bottom plate and connected into a rotating speed control circuit of the rotating part, a sliding piece of the sliding resistor is connected with the telescopic end of the telescopic part, a roller shaft part is installed at the telescopic end, the cable penetrates through the roller shaft part in a sliding mode, and the stringing degree is automatically adjusted through changes of the sliding resistor. A piezoresistive high-frequency dynamic pressure sensor is arranged at the contact position of the roller shaft piece and the cable, an electromagnetic coil connected with a circuit is arranged in the telescopic piece, magnetorheological fluid is arranged in the telescopic piece, and the resistance of the telescopic piece to instantaneous acting force is improved through the magnetorheological fluid capable of increasing resistance through electrification. An elastic assembly is arranged on a roller shaft of the roller shaft piece and used for reducing the influence of wind blowing vibration on the wire tightening precision. According to the invention, under the condition that stepless adjustment is carried out on cable tightening, the adjustment precision and stability during cable tightening are further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power equipment, and in particular to a line tightening device for electric power construction. Background Art

[0002] In power construction projects, cable laying is a key link to ensure the stable operation of the power system. Cable laying in my country is mainly based on the installation method of overhead transmission lines. The drooping part of the loose cable may generate arc discharge due to wind swing or temperature changes, resulting in waste of electricity or even short circuit. In addition, the loose cable is easily swung by external forces, resulting in loose connection points or wear of the insulation layer. Therefore, during the laying process of overhead transmission lines, the cables need to be tightened to improve the stability, safety and durability of the cables.

[0003] When laying cables, power workers usually lay and tighten the cables on transmission towers. By winding the free ends of the cables, the cables between the two transmission towers are tightened. However, due to the long length and heavy weight of the cables, power workers alone cannot tighten the cables. Existing tightening devices generally rely on manual operation, such as using a crank to drive a threaded rod or a ratchet mechanism to gradually tighten the cable. For example, a tightening device for power construction proposed in Chinese patent document CN202411696684.3 is equipped with a stop assembly to prevent reverse rotation, but the crank must be manually turned to drive the reel to reel in the cable. The entire process requires manual operation, which is inefficient and cannot achieve continuous operation.

[0004] Therefore, in order to solve the above problems, it is necessary to provide a tightening device that can automatically tighten the wire and automatically adjust the degree of tightening.

[0005] However, the automatic tensioning device is susceptible to external factors during the tensioning process. Cables are typically laid at the tops of poles and towers. When working in outdoor, high-altitude environments, wind-induced cable vibrations are random and unstable. When this vibration is transmitted to the automatic tensioning device, the vibration force mixes with the tensioning force, easily affecting the device's ability to accurately adjust the tension. Furthermore, when strong winds exert a strong force on the cable, or when the cable becomes entangled and hung during laying or wind-induced wind, a strong instantaneous force is generated at the automatic tensioning device where the cable is connected. This sudden change in force can easily lead to excessive pressure on the tensioning end of the automatic tensioning device, causing structural damage.

[0006] Therefore, in order to address the above problems, it is necessary to further eliminate the vibration caused by wind at the tensioning end on the basis of setting up an automatic tensioning device, improve the accuracy of automatic tensioning adjustment, and further improve the resistance of the automatic tensioning device to instantaneous forces to maintain the stability of the automatic tensioning device. Summary of the Invention

[0007] The object of the present invention is to provide a cable tightening device for electric power construction, which can realize automatic cable tightening and automatically adjust the cable tightening degree, thereby further improving the adjustment accuracy and stability during cable tightening.

[0008] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0009] A wire tightening device for electric power construction comprises a bottom plate.

[0010] Preferably, a winding drum driven by a rotating member is provided on the bottom plate, and the winding drum winds up the fixed end of the cable.

[0011] Preferably, a roller component, a telescopic component, and a sliding resistor are provided on the bottom plate.

[0012] Preferably, the sliding resistor is connected to the speed control circuit of the rotating part, the sliding piece of the sliding resistor is connected to the telescopic end of the telescopic part, a roller part is installed on the telescopic end, and the cable is slidably passed through the roller part.

[0013] Preferably, a piezoresistive high-frequency dynamic pressure sensor is provided at the contact position between the roller member and the cable. The piezoresistive high-frequency dynamic pressure sensor is connected to the control switch and the switch controller of the rotating component through a circuit, and an electromagnetic coil connected to the circuit is provided inside the telescopic member.

[0014] Preferably, a liquid medium is provided inside the telescopic part of the telescopic member, and the liquid medium is configured as a magnetorheological fluid.

[0015] Preferably, an elastic component is provided on the roller shaft of the roller member, one elastic end of the elastic component is connected to one end of the roller shaft, and the other end abuts against the cable sliding on the roller shaft.

[0016] Preferably, a pre-tensioning mechanism is provided on the bottom plate, and the pre-tensioning mechanism includes a clamp, and the cable is sequentially passed through the clamp, the roller and the winding drum.

[0017] Preferably, a vertical plate is provided on one side of the bottom plate, and two first hoops are provided on the side of the vertical plate facing away from the bottom plate, and the two first hoops are aligned in the vertical direction.

[0018] Preferably, the roller member includes a third guide roller and a lifting plate, and the telescopic member includes two telescopic rods.

[0019] Preferably, the two telescopic rods are distributed on both sides of the top of the base plate, the lifting plate is fixedly set on the top of the telescopic rods, the two ends of the third guide roller are set on the lifting plate through two second mounting plates, and the two ends of the third guide roller are rotatably connected to the second mounting plates.

[0020] Preferably, the sliding resistor is arranged in the control box, and the sliding resistor includes a resistor body, a slider, a push block and a slide rod. The resistor body and the slide rod are vertically arranged in the control box, the push block is sleeved on the slide rod, the push block and the slide rod are slidably connected, and a slider is provided on the push block, the slider is in electrical contact with the resistor body, and the slider can move on the surface of the resistor body.

[0021] Preferably, a first through hole and a second through hole are provided on the top of the control box, the first through hole is located above the push block, and the second through hole is located above the switch, and a first push rod and a second push rod are provided at the bottom of the lifting plate, the bottom of the first push rod passes through the first through hole and is fixedly connected to the push block, the second push rod is located above the second through hole, and an insulating block is provided at the bottom of the second push rod.

[0022] Preferably, the pre-tensioning mechanism includes a second vertical plate and a clamp, the second vertical plate is fixedly arranged on the top of the base plate, the clamp is arranged on the side of the vertical plate close to the control mechanism, the clamp includes a slider and a second clamp for clamping the cable, the second clamp is fixedly arranged on the slider, a horizontal slide groove is provided on the vertical plate, and the slider is slidably connected to the slide groove.

[0023] Preferably, the second vertical plate is also provided with a first guide roller and a second guide roller, the first guide roller is fixedly set on the top of the vertical plate, the second guide roller is set below the slide groove, the two ends of the second guide roller are set on the vertical plate through two first mounting plates, and the two ends of the second guide roller are rotatably connected to the first mounting plate.

[0024] Preferably, the first guide roller, the second guide roller and the third guide roller are each provided with a wire block, the wire block is a circular ring structure, the wire block is coaxially sleeved on the first guide roller, the second guide roller and the third guide roller, the wire block is slidingly connected to the first guide roller, the second guide roller and the third guide roller, and a circle of wire groove is provided on the outer surface of the wire block.

[0025] Preferably, the elastic components are respectively arranged on the second guide roller and the third guide roller, and the elastic components are arranged as springs. Two springs are respectively sleeved on each guide roller, and the outer ends of the two springs are respectively fixed on the two ends of each guide roller, and the inner ends of the two springs are respectively fixed on the two side surfaces of the wire block on each guide roller.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. In the present invention, in order to achieve automatic cable tightening, a rotatable winding drum controlled by a motor is provided to automatically tighten the cable. In order to adjust the cable tension in real time during the automatic cable tightening process, a sliding resistor is connected to the speed control circuit of the motor, and a roller member that is retractable by cable pressure is provided to control the resistance change of the sliding resistor, thereby controlling the speed of the winding drum and automatically and steplessly adjusting the cable tension during cable tightening.

[0028] 2. In the present invention, in order to improve the resistance of the retractable roller member to the instantaneous force applied by the external cable during automatic tensioning (the instantaneous force will affect the telescopic accuracy of the roller member), a piezoresistive high-frequency dynamic pressure sensor is provided on the roller member, and a magnetorheological fluid is provided in the telescopic member. When the piezoresistive high-frequency dynamic pressure sensor senses the instantaneous pressure change of the cable, it will send a signal to energize the electromagnetic coil in the telescopic member, provide magnetic force for the magnetorheological fluid, and change it from a liquid medium to a high-resistance solid medium, thereby protecting the telescopic member, improving the resistance of the telescopic member to the instantaneous force outside the telescopic direction, maintaining the telescopic accuracy of the telescopic member, thereby improving the resistance change accuracy of the sliding resistor, improving the tension adjustment accuracy of the winding reel, and maintaining the stability of the automatic tensioning device;

[0029] 3. In the present invention, in order to reduce the influence of external wind vibration on the automatic adjustment of tension, a plurality of guide rollers arranged up and down on the roller member are used to absorb the vertical vibration force of the cable thereon, and an elastic component is provided on the roller shaft of the roller member to absorb and buffer the lateral vibration of the cable on the roller shaft. When the external cable is laid or subjected to wind vibration, the vibration force transmitted to the tensioning device can be absorbed by the roller member and the elastic component, thereby reducing the influence of the vibration force on the downward pressure of the cable when pressing the telescopic member, thereby reducing the influence of the vibration on the accuracy of the telescopic amount, thereby further improving the tension adjustment accuracy of the winding drum.

[0030] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings:

[0031] Figure 1 Schematic diagram of the structure of the present invention Figure 1 ;

[0032] Figure 2 Schematic diagram of the structure of the present invention Figure 2 ;

[0033] Figure 3 It is a side view of the present invention;

[0034] Figure 4 is a cross-sectional view of the telescopic rod of the present invention;

[0035] Figure 5 A top view of the present invention;

[0036] Figure 6 This is a schematic diagram of the control box structure of the present invention;

[0037] The reference numerals are as follows:

[0038] 1-base plate, 11-universal wheel, 12-first vertical plate, 13-first hoop, 2-second vertical plate, 21-first guide roller, 22-slider, 23-slide, 24-second hoop, 25-first mounting plate, 26-second guide roller, 3-control mechanism, 31-third guide roller, 32-lifting plate, 33-second mounting plate, 34-telescopic rod, 341-cylinder, 342-sliding column, 35-spring, 36 -First push rod, 37-Second push rod, 38-Insulation block, 4-Control box, 41-First through hole, 42-Second through hole, 43-Resistor, 44-Slider, 45-Push block, 46-Slider, 47-Switch, 5-Winding reel, 51-Support plate, 52-Rotary motor, 6-Wire block, 61-Wire slot, 7-Piezoresistive high-frequency dynamic pressure sensor, 8-Magnetorheological fluid, 9-Control switch, 91-Electromagnetic coil. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but rather merely represents selected embodiments of the present application. Based on the embodiments in this application, all other embodiments obtained by a person of ordinary skill in the art without making any creative effort are within the scope of protection of this application. It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0041] In the description of this application, it should be noted that if the terms "center", "upper", "lower", "inner", "outer" and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the application is usually placed when in use, it is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, if the terms "set", "install", and "connect" appear, they should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the internal parts of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] Example

[0043] like Figure 1-5 As shown, a wire tensioning device for power construction includes a base plate 1. A plurality of universal wheels 11 are installed at the bottom of the base plate 1 to facilitate the movement of the entire device. A winding drum 5 driven by a rotating part is provided on the base plate 1 for winding the cable to be tightened.

[0044] A control mechanism 3 is also provided on the base plate 1, which includes a roller member, a telescopic member, and a sliding resistor, wherein the sliding resistor is connected to the speed control circuit of the rotating member, and the slider 44 of the sliding resistor is connected to the telescopic end of the telescopic member, on which a roller member is installed. When the cable slides through the roller member and is wound on the winding drum 5, the rotating member drives the winding drum 5 to wind the cable to tighten the line. The cable is subjected to the tension of the winding, and the generated force (tensioning force) will act on the roller member, causing the telescopic member to contract, thereby driving the slider 44 to slide in the sliding resistor, changing its resistance value, so that the current in the speed control circuit of the rotating member changes accordingly due to the change in resistance value, thereby adjusting the speed of the rotating member, so that the greater the cable tension, the greater the telescopic amount, the greater the resistance value, the smaller the current, the smaller the speed of the rotating member, and the slower the winding and tightening speed of the winding drum 5; thereby achieving stepless adjustment of the cable tightening amplitude.

[0045] A pre-tensioning mechanism is also provided on the base plate 1, which includes a clamp. The cable for tightening the wire passes through the clamp first, then passes through the roller member of the control mechanism 3, and finally is wound on the winding drum 5. When the winding drum 5 rotates to tighten the wire, the cable will slide on the roller member and in the clamp. When the cable slides through the clamp, part of the cable that has collapsed due to accumulation will be straightened due to the tension of the winding drum 5 and the force of the roller member, thereby performing pre-tensioning and reducing the occurrence of loose cables wound in the winding drum 5.

[0046] A piezoresistive high-frequency dynamic pressure sensor 7 is also installed at the contact point between the pretensioning mechanism and the cable. This sensor is connected to a control switch 9 and the switch 47 controller of the rotating assembly via circuits. The control switch 9 is connected to an external power source, and an electromagnetic coil 91 connected to the circuit is installed inside the telescopic element. A liquid medium is placed inside the telescopic element. When the telescopic element is extended or retracted, it squeezes the liquid medium, thereby providing reset pressure to the telescopic end, allowing the telescopic end to reset after extension.

[0047] The liquid medium is a magnetorheological fluid 8 , which is a liquid medium with normal resistance when not magnetized, and a solid medium (or semi-solid medium) with high resistance and low fluidity when magnetized. When a cable segment under construction in an external environment is subjected to construction accidents such as wind vibration, impact, or line hanging, the cable segment where the cable is being tightened will be subjected to instantaneous pressure changes (pressure will suddenly increase or decrease). At this time, the tensioning degree of the device will also change violently with the pressure changes. During the repeated tightening process, the cable is easily broken, and the device is easily damaged due to excessive external pressure. Therefore, when the piezoresistive high-frequency dynamic pressure sensor 7 on the pre-tensioning mechanism that first contacts the cable senses the instantaneous increase in pressure, it will send a signal to the control switch 9. The control switch 9 will pass current through the electromagnetic coil 91 to generate a magnetic field. Through electromagnetic induction, the magnetorheological fluid 8 inside the telescopic member becomes a medium with greater resistance, limiting the expansion and contraction of the telescopic member and providing support for the telescopic member to prevent damage. The piezoresistive high-frequency dynamic pressure sensor 7 will also send a signal to the switch 47 section of the rotating member to stop the rotating member, thereby stopping the tensioning work of the entire device. The sudden pressure change in the cable will not cause the tensioning amplitude to change violently, thereby reducing the probability of cable breakage, protecting the entire tensioning device, and improving construction safety.

[0048] In addition, an elastic component is provided on the roller shaft of the roller member. One elastic end of the elastic component is connected to one end of the roller shaft, while the other elastic end abuts the cable sliding on the roller shaft. Because some cable installations are carried out in high-altitude environments, they are susceptible to wind. When strong winds blow, the cable segments installed at high altitudes will continue to swing irregularly. The vibration generated by this swinging cable segment is transmitted to the entire tensioning device, causing the cable to continue to swing and vibrate on the roller shaft during the tensioning process. This vibration of the cable causes the pressure applied to the roller shaft to be subjected to additional vibration, resulting in frequent pressure fluctuations. This affects the pressure applied by the cable on the roller shaft, further affecting the displacement accuracy of the telescopic member. This reduces the adjustment accuracy of the rotating member that continuously adjusts the cable tension through the telescopic member, making it difficult to ensure accurate cable tension adjustment. Therefore, the elastic component on the roller shaft elastically absorbs the additional vibration force from the cable, reducing the occurrence of low tensioning accuracy caused by the cable's own vibration.

[0049] Please refer to Figure 1 and Figure 2 In some feasible embodiments, a pair of support plates 51 distributed on both sides are provided on the top of the base plate 1. The two ends of the winding drum 5 are rotatably connected to the support plates 51. The rotating part is set as a rotating motor 5. A rotating motor 52 for driving the winding drum 5 is fixed on the support plate 51 on one side of the winding drum 5. A spiral groove is provided on the disk surface of the winding drum 5. When the end of the cable fixing end is stuck in the groove, the cable segment is wound in the spiral groove to pre-tighten the cable fixing end, improve the torque resistance of the cable fixing end when it is subjected to tension, reduce the slippage of the cable fixing end on the winding drum 5, and suppress the occurrence of cable loosening and jumper phenomenon.

[0050] When in use, the fixed end of the cable is first fixed, and then the rotary motor 52 is started to drive the winding drum 5 to rotate, and the cable is wound and tightened.

[0051] In some feasible embodiments, a vertical plate is provided on one side of the base plate 1, and two first clamps 13 are provided on the side of the vertical plate facing away from the base plate 1. The two first clamps 13 are aligned in the vertical direction. The two first clamps 13 are put on the electric pole to fix the device, thereby preventing the device from moving due to excessive tension in the cable during the tightening process.

[0052] Furthermore, when the cable is first wound, the free end of the cable is in a relatively loose state, and the tension on the cable will gradually increase during the tightening process. If the cable is directly wound on the winding drum 5, it will cause the cable to be partially loose and the tension in some parts to be too large. The control mechanism 3 can adjust the speed of the rotating motor 52 according to the tension on the cable. The greater the tension on the cable, the smaller the speed of the rotating motor 52, which can improve the uniformity of the cable winding on the winding drum 5, reduce the possibility of local stress concentration in the cable, and improve the durability of the cable.

[0053] Please refer to Figures 1-4 In some feasible embodiments, the roller shaft component of the control mechanism 3 includes a third guide roller 31 , a lifting plate 32 , and a second mounting plate 33 , and the telescopic component is configured as a telescopic rod 34 .

[0054] Specifically, the two telescopic rods 34 are distributed on both sides of the top of the base plate 1, the lifting plate 32 is fixedly set on the top of the telescopic rods 34, and the two ends of the third guide roller 31 are set on the lifting plate 32 through two second mounting plates 33. The two ends of the third guide roller 31 are rotatably connected to the second mounting plates 33. The cable passes through the third guide roller 31. Under the action of the cable's own gravity and the tension applied by the laying end, the cables on both sides of the third guide roller 31 are lower than the third guide roller 31 (one side is affected by the force of the winding drum 5, and the other side is affected by the tension of the laying end). The cable will exert a downward force on the third guide roller 31, and the third guide roller 31 will exert a downward force on the lifting plate 32. Since a telescopic rod 34 is provided at the bottom of the lifting plate 32, the lifting plate 32 will drop due to the contraction of the telescopic rod 34. The greater the tension of the cable, the greater the force applied by the cable to the third guide roller 31, and the greater the distance the lifting plate 32 drops. However, since there is still liquid medium in the telescopic rod 34, the liquid medium will be squeezed when the telescopic rod contracts. The volume of the liquid medium is compressed, which will exert a reaction force on the telescopic end of the telescopic rod 34. When the tension of the cable decreases, the lifting plate 32 will reset and rise under the reaction of the compressed liquid medium in the telescopic rod 34.

[0055] Among them, please refer to Figure 2 and Figure 4 In some feasible embodiments, the telescopic rod 34 includes a cylinder 341 and a slide 342. The cylinder 341 is fixed to the base plate 1. The cylinder 341 has a sliding cavity. The slide 342 is vertically slidably inserted into the cavity. The slide 342 slides vertically to achieve the telescopic effect of the telescopic rod 34. The sliding cavity of the cylinder 341 is pressurized with magnetorheological fluid 8, which provides a liquid medium for the entire cavity. When the slide 342 slides into the cylinder 341 under external force, it squeezes the magnetorheological fluid 8, allowing the slide 342 to move upward and reset after being freed from external force.

[0056] A second vertical plate 2 is fixed on the bottom plate 1, and a first guide roller 21 is fixedly arranged on the top of the vertical plate. The cable slides in contact with the upper part of the first guide roller 21, which can prevent the cable from rubbing on the top of the second vertical plate 2 and causing damage to the outer surface of the cable. A piezoresistive high-frequency dynamic pressure sensor is provided on the top of the second vertical plate 2. Two piezoresistive high-frequency dynamic pressure sensors 7 are correspondingly arranged at both ends of the first guide roller 21, and the sensing end of the piezoresistive high-frequency dynamic pressure sensor 7 is in contact with the lower end of the first guide roller 21. When the cable slides on the upper part of the first guide roller 21 and generates downward pressure, the sensing end of the piezoresistive high-frequency dynamic pressure sensor 7 will feel the pressure transmitted by the first guide roller 21, thereby sensing the instantaneous pressure changes generated by the cable segment in the external environment.

[0057] A control switch 9 is also fixedly provided on the bottom plate 1 . The control switch 9 is connected to an electromagnetic coil 91 through an electrical circuit. The electromagnetic coil 91 is fixed to the bottom of the cavity of the cylinder.

[0058] Because the piezoresistive high-frequency dynamic pressure sensor 7 is different from the commonly used pressure sensors, the piezoresistive high-frequency dynamic pressure sensor 7 uses the principle of piezoresistive effect to measure both steady-state pressure and transient pressure. It displays a stable static pressure when the transformer is working normally, while a rapid pressure peak will appear during transient changes in pressure, causing the piezoresistive high-frequency dynamic pressure sensor 7 to output a corresponding electrical signal at the moment of sensing the transient pressure. The electrical signal will be transmitted to the control switch and the switch controller of the rotating motor 52 at the same time through the circuit, stopping the tightening work and providing support for the telescopic rod 34 as a whole.

[0059] The tension on the cable 342 is greater than the tension on the cable 341. The tension on the cable 342 is greater than the tension on the cable 341. The interior of the sliding column 342 may also be configured as a cavity and filled with magnetorheological fluid 8 to improve the robustness of the sliding column 342 .

[0060] A control box 4 is provided at the bottom of the control mechanism 3. A sliding resistor and a switch 47 are provided in the control box 4. The sliding resistor and the switch 47 are connected in series in the circuit between the rotary motor 52 and the power supply. The sliding resistor is vertically arranged in the control box 4. The sliding resistor includes a resistor body 43, a slider 44, a push block 45, and a slide rod 46. The resistor body 43 and the slide rod 46 are vertically arranged in the control box 4. The push block 45 is sleeved on the slide rod 46. The push block 45 and the slide rod 46 are slidably connected. The push block 45 is provided with a slider 44. The slider 44 is in electrical contact with the resistor body 43 and can move on the surface of the resistor body 43. Changing the position of the slider 44 on the resistor body 43 can change the resistance of the resistor body 43 connected to the circuit, thereby changing the speed of the rotary motor 52. Moving the push block 45 will cause the push block 45 to move up and down in the slide rod 46, thereby driving the slider 44 to slide on the surface of the resistor body 43, changing the resistance of the resistor body 43 connected to the circuit.

[0061] A fixed contact and a movable contact are provided in the switch 47. Under normal circumstances, the fixed contact and the movable contact are in contact to form a current path. When the movable contact is pushed and separated from the fixed contact, the circuit is disconnected.

[0062] A first through hole 41 and a second through hole 42 are provided at the top of the control box 4. The first through hole 41 is located above the push block 45, and the second through hole 42 is located above the switch 47. A first push rod 36 and a second push rod 37 are provided at the bottom of the lifting plate 32. The first push rod 36 is longer than the second push rod 37. The bottom of the first push rod 36 passes through the first through hole 41 and is fixedly connected to the push block 45. The second push rod 37 is located above the second through hole 42. An insulating block 38 is provided at the bottom of the second push rod 37. When the lifting plate 32 moves, it drives the first push rod 36 and the second push rod 37 to move synchronously. The first push rod 36 drives the push block 45 to move up and down, changing the resistance of the resistor 43 connected to the circuit. When the second push rod 37 moves downward to its maximum displacement, the insulating sheet at the bottom of the second push rod 37 inserts into the switch 47, pushing the movable contact in the switch 47 away from the fixed contact, disconnecting the circuit. At this time, the rotating motor 52 does not work. Except when the second push rod 37 is at the maximum downward displacement, when the second push rod 37 is at any other position, the insulating sheet will not be inserted into the switch 47 to disconnect the circuit.

[0063] Specifically, the cable passes over the third guide roller 31 and enters the winding drum 5 to be wound into a roll. The tension of the cable will continue to change during the tightening process. When the tension becomes larger, the third guide roller 31 drops, driving the lifting plate 32 to drop, and then driving the bottom of the first push rod 36 and the second push rod 37 to move downward. The first push rod 36 moves downward to push the push block 45. The resistance value of the resistor 43 connected to the circuit increases, which reduces the speed of the rotating motor 52. The lifting plate 32 continues to move downward. When the tension of the cable reaches a preset value, the second push rod 37 reaches When the cable is tightened, the third guide roller 31 rises, driving the lifting plate 32 to rise, thereby driving the bottom of the first push rod 36 and the second push rod 37 to move upward, and the first push rod 36 moves upward to drive the push block 45 to move upward, and the resistance value of the resistor 43 connected to the circuit decreases, thereby increasing the speed of the rotating motor 52. When the lifting plate 32 continues to move upward to the highest point, the resistance value of the resistor 43 connected to the circuit is the smallest, and the speed of the rotating motor 52 is the largest.

[0064] In some feasible embodiments, the pretensioning mechanism includes a second riser 2 and a clamping assembly. The second riser 2 is fixedly mounted on the top of the base plate 1. The clamping assembly is positioned on a side of the riser near the control mechanism 3. The clamping assembly includes a slider 22 and a second clamping ring 24 for clamping the cable. The second clamping ring 24 is fixedly mounted on the slider 22. A horizontal slot 23 is provided on the riser, and the slider 22 is slidably connected to the slot 23. The second clamping ring 24 can clamp the cable but does not completely secure it. The cable can move relative to the second clamping ring 24. Specifically, a sponge pad is attached to the clamping surface of the second clamping ring 24. The sponge pad is elastic and made of a soft material. When the cable slides within the second clamping ring 24, the sponge pad is squeezed by the cable sheath, exerting frictional resistance on the cable. When the other end of the cable is wound by the winding drum 5, the friction force causes the cable to be slightly stretched as it slides through the second clamping ring 24, preventing it from collapsing. This allows the cable to be wound onto the winding drum 5 in a stretched state, reducing the possibility of loosening of the cable on the winding drum 5. Moreover, the soft and porous structure of the sponge pad can remove water stains and mud stains on the cable surface without damaging the cable surface, reducing the risk of cable surface stains adhering to the surface of the winding drum 5, which may cause the wound cable to slip easily.

[0065] The clamping force of the second clamp 24 needs to be controlled so as not to affect the control function of the control mechanism 3 .

[0066] In some feasible embodiments, the second riser 2 is further provided with a second guide roller 26 . The second guide roller 26 is disposed below the chute 23 . The ends of the second guide roller 26 are mounted on the riser via two first mounting plates 25 . The ends of the second guide roller 26 are rotatably connected to the first mounting plates 25 . After the cable passes through the second clamping hoop 24 , it passes through the bottom of the second guide roller 26 . The second guide roller 26 serves to straighten and guide the cable. The cable passes sequentially through the first guide roller 21 , the second clamping hoop 24 , and the second guide roller 26 .

[0067] In some feasible embodiments, a conductor block 6 is provided on each of the first guide roller 21, the second guide roller 26, and the third guide roller 31. The conductor block 6 is a circular ring structure and is coaxially sleeved on the first guide roller 21, the second guide roller 26, and the third guide roller 31. The conductor block 6 is slidably connected to the first guide roller 21, the second guide roller 26, and the third guide roller 31. A wire groove 61 is provided on the outer surface of the conductor block 6. During the cable tensioning process, the cable will inevitably swing left and right at high frequencies on the first guide roller 21, the second guide roller 26, and the third guide roller 31 due to cable laying movement or high-altitude wind. Therefore, the cable is placed in the wire groove 61 of the conductor block 6, allowing the conductor block 6 to move on the first guide roller 21, the second guide roller 26, and the third guide roller 31. This does not hinder the left and right movement of the cable, thus reducing the impact on cable laying. At the same time, it also prevents the cable from rubbing against the surfaces of the first guide roller 21, the second guide roller 26, and the third guide roller 31, which could cause damage to the cable surface.

[0068] Among them, the second guide roller 26 and the third guide roller 31 are also provided with elastic components, which are configured as springs 35. Two springs 35 are respectively sleeved on each guide roller, and the outer ends of the two springs 35 are respectively fixed at the two ends of each guide roller, and the inner ends of the two springs 35 are respectively fixed on the two side surfaces of the wire block 6 on each guide roller, providing elastic buffering for the sliding of the wire block 6.

[0069] When the cable vibrates due to laying or wind, the vibration will be transmitted to the cable section on the guide roller. The vertical vibration force will be absorbed by the fixed first guide roller 21 and the second guide roller 26 in the guide, while the lateral vibration force will be further absorbed by the springs 35 on each guide roller, thereby reducing the vibration force transmitted to the telescopic rod 34, resulting in the telescopic amount of the telescopic rod 34 being affected, and the tensioning accuracy being affected.

[0070] It is worth noting that because the two telescopic rods 34 are arranged at both ends of the lifting plate 32, when the lateral vibration force acts on the two telescopic rods 34, the two telescopic rods 34 will be subjected to different lateral forces, resulting in the increase of the friction resistance generated by the lateral force when the sliding column 342 of the telescopic rod 34 slides in the cylinder body 341, thereby causing the telescopic rod 34 at one end of the lifting plate 32 to slide smoothly, while the telescopic rod 34 at the other end is blocked from sliding, thereby affecting the overall telescopic amount of the two telescopic rods 34, and then affecting the tensioning accuracy. Therefore, it is also necessary to absorb the lateral vibration.

[0071] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art. So far, the various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here. The scope of the present disclosure is defined by the appended claims.

Claims

1. A wire tightening device for electric power construction, comprising a base plate (1), characterized in that: The base plate (1) is provided with a winding drum (5) driven by a rotating member, and the winding drum (5) winds the fixed end of the cable; The bottom plate (1) is provided with a roller shaft component, a telescopic component, and a sliding resistor; The sliding resistor is connected to the speed control circuit of the rotating part, the sliding piece (44) of the sliding resistor is connected to the telescopic end of the telescopic part, the telescopic end is equipped with a roller part, and the cable is slidably passed through the roller part; A piezoresistive high-frequency dynamic pressure sensor (7) is provided at the contact position between the roller member and the cable. The piezoresistive high-frequency dynamic pressure sensor (7) is connected to a control switch (9) and a switch (47) controller of a rotating assembly through a circuit, and an electromagnetic coil (91) connected to the circuit is provided inside the telescopic member. A liquid medium is provided inside the telescopic part of the telescopic member, and the liquid medium is provided as a magnetorheological fluid (8); An elastic component is provided on the roller shaft of the roller shaft member, one elastic end of the elastic component is connected to one end of the roller shaft, and the other end abuts against the cable sliding on the roller shaft.

2. A wire tightening device for electric power construction according to claim 1, characterized in that: The base plate (1) is provided with a pre-tensioning mechanism, which comprises a clamping hoop, and the cable is sequentially passed through the clamping hoop, the roller shaft and the winding drum (5).

3. A wire tightening device for electric power construction according to claim 1, characterized in that: A vertical plate is provided on one side of the bottom plate (1), and two first hoops (13) are provided on the side of the vertical plate facing away from the bottom plate (1), wherein the two first hoops (13) are aligned in a vertical direction.

4. A wire tightening device for electric power construction according to claim 1, characterized in that: The roller shaft member includes a third guide roller (31) and a lifting plate (32), and the telescopic member includes two telescopic rods (34); The two telescopic rods (34) are distributed on both sides of the top of the base plate (1); the lifting plate (32) is fixedly arranged on the top of the telescopic rods (34); the two ends of the third guide roller (31) are arranged on the lifting plate (32) through two second mounting plates (33); and the two ends of the third guide roller (31) are rotatably connected to the second mounting plates (33).

5. A wire tightening device for electric power construction according to claim 1, characterized in that: The sliding resistor is arranged in a control box (4), and the sliding resistor comprises a resistor body (43), a slide (44), a push block (45) and a slide rod (46). The resistor body (43) and the slide rod (46) are vertically arranged in the control box (4), the push block (45) is sleeved on the slide rod (46), the push block (45) and the slide rod (46) are slidably connected, the push block (45) is provided with a slide (44), the slide (44) is in electrical contact with the resistor body (43), and the slide (44) can move on the surface of the resistor body (43).

6. A wire tightening device for electric power construction according to claim 5, characterized in that: The control box (4) is provided with a first through hole (41) and a second through hole (42) on the top, the first through hole (41) is located above the push block (45), and the second through hole (42) is located above the switch (47). The bottom of the lifting plate (32) is provided with a first push rod (36) and a second push rod (37), the bottom of the first push rod (36) passes through the first through hole (41) and is fixedly connected to the push block (45), the second push rod (37) is located above the second through hole (42), and the bottom of the second push rod (37) is provided with an insulating block (38).

7. A wire tightening device for electric power construction according to claim 2, characterized in that: The pre-tensioning mechanism comprises a second vertical plate (2) and a clamp, wherein the second vertical plate (2) is fixedly arranged on the top of the base plate (1), and the clamp is arranged on a side of the vertical plate close to the control mechanism (3), and the clamp comprises a slider (22) and a second clamp (24) for clamping the cable, and the second clamp (24) is fixedly arranged on the slider (22), and a horizontal slide groove (23) is provided on the vertical plate, and the slider (22) is slidably connected to the slide groove (23).

8. A wire tightening device for electric power construction according to claim 7, characterized in that: The second vertical plate (2) is further provided with a first guide roller (21) and a second guide roller (26), wherein the first guide roller (21) is fixedly arranged on the top of the vertical plate, and the second guide roller (26) is arranged below the slide groove (23), and both ends of the second guide roller (26) are arranged on the vertical plate through two first mounting plates (25), and both ends of the second guide roller (26) are rotatably connected to the first mounting plates (25).

9. A wire tightening device for electric power construction according to claim 8, characterized in that: The first guide roller (21), the second guide roller (26) and the third guide roller (31) are all provided with a conductor block (6), the conductor block (6) is a circular ring structure, the conductor block (6) is coaxially sleeved on the first guide roller (21), the second guide roller (26) and the third guide roller (31), the conductor block (6) is slidably connected to the first guide roller (21), the second guide roller (26) and the third guide roller (31), and a circle of wire grooves (61) are provided on the outer surface of the conductor block (6).

10. The wire tightening device for electric power construction according to claim 1, characterized in that: The elastic components are respectively arranged on the second guide roller (26) and the third guide roller (31), and the elastic components are arranged as springs (35). Two springs (35) are respectively sleeved on each guide roller, and the outer ends of the two springs (35) are respectively fixed on the two ends of each guide roller, and the inner ends of the two springs (35) are respectively fixed on the two side surfaces of the wire block (6) on each guide roller.

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