263 results about "Overhead cable" patented technology

The invention, which relates to the technical field of cable fault detection, discloses a diagnosis device suitable for fault early warning and positioning of an overhead cable of a power transmission line, comprising a detection data acquisition unit, a partial discharge detection unit and a fault detection processing unit. According to the invention, the sensor optimization module is used for optimizing the sensor, the signal auxiliary module is used for assisting the signal, and the electromagnetic interference during cable detection can be reduced after processing, so that the acquired traveling wave signal is stabilized, and the signal is enhanced and the signal-to-noise ratio of the signal is improved through the signal amplification and signal filtering technology. The influence of noise and interference signals on the traveling wave signals is reduced, the traveling wave signals are conveniently and stably obtained, errors during fault diagnosis and positioning are reduced, the accuracy degree of fault diagnosis is ensured, early warning is conducted in time when a fault occurs, positioning is assisted through a distributed optical fiber temperature measurement method, the accuracy of fault positioning can be ensured, and rapid maintenance of a subsequent cable is facilitated.

The present invention describes an overhead cable spacer device for coupling and keeping them separate from each other. The spacer device has a spacer body and at least four spacer arms coupled to the spacer body. Each of said at least four spacer arms includes an entering portion to receive the overhead cables and at least two retaining elements. One of said at least four spacer arms comprises a hole in its upper portion in which a mechanical rod is coupled in order for the spacer device to be installed from the ground, and a retaining element allows the coupling of the overhead cable, by means of pressure, and the other retaining element prevents the uncoupling of the overhead cable.

The invention relates to the technical field of cables, and provides a corrosion-resistant overhead cable which sequentially comprises a conductor, an insulating layer, a shielding layer, a lining layer and an outer sheath layer from inside to outside. The outer sheath layer comprises the following raw materials in parts by weight: 60-70 parts of polyethylene, 20-30 parts of an ethylene-vinyl acetate copolymer, 10-15 parts of polyphenylene sulfide, 25-35 parts of a flame retardant, 0.5-1 part of an antioxidant, 2-3 parts of a lubricant, 3-5 parts of a compatilizer and 15-25 parts of a rectorite / tungsten carbide composite material; the mass ratio of rectorite to tungsten carbide is (1: 9)-(9: 1). According to the technical scheme, the problem of poor corrosion resistance of the overhead cable in the prior art is solved.

The invention relates to the technical field of overhead cable equipment inspection, in particular to an overhead high-voltage cable live inspection device based on infrared thermal imaging, which comprises a control terminal and a clamping frame, a mechanical arm is fixed on the control terminal, the clamping frame is composed of two semicircular frames, one end of the semicircular frame on one side is provided with a hinge, and the other end of the semicircular frame on the other side is provided with a power supply. The hinge is connected with one end of the other semi-circular frame, the two semi-circular frames are connected through the hinge, when a worker inspects an inspection target, the worker only needs to clamp a telegraph pole through the two semi-circular frames, then rotates the screw to fix the semi-circular frames, the device is started, then the target can be inspected, operation is simple, and operation is convenient. Personnel do not need to climb to work, so that the personal safety of the working personnel is guaranteed; the control terminal automatically identifies and records the number of the target, and when the target needs to be maintained, the target can be accurately and quickly positioned, so that a worker can visually know the detected target in the inspection process, and the situation of missing inspection is avoided.

The invention relates to the technical field of power grid deicing, and discloses a power grid deicing device and method based on environment detection and monitoring, and the device comprises a mounting part which sleeves an overhead cable between two power transmission line towers through a configured moving through cavity, so that the device can freely move in the direction of the overhead cable; therefore, monitoring and deicing operations at different positions are realized. The environment monitoring part judges whether icing occurs or not by acquiring environment information (such as temperature, humidity and wind speed) around the overhead cable, extracts character behavior characteristics in combination with image information, and further judges whether suspicious persons exist or not. And if it is judged that the overhead cable is iced, the mounting part can deice by oscillating the overhead cable, and the oscillation amplitude is automatically adjusted according to the environment information monitored in real time, so that the optimal deicing effect is achieved. According to the invention, the environment change can be intelligently monitored, the working strategy can be dynamically adjusted according to the real-time data, and the deicing efficiency and accuracy are improved.

The invention belongs to the technical field of high-altitude wiring, and particularly relates to an auxiliary wiring device for an overhead cable, which comprises a bottom plate, a lifting mechanism and a top plate, the bottom plate is connected with the top plate through the lifting mechanism, the top plate is provided with a wire pulling piece and a guardrail, the guardrail is arranged at the top of the top plate, and the wire pulling piece is arranged at the bottom of the top plate. The two ends of the guardrail are provided with guiding pieces used for guiding the cable, the middle of the guardrail is further provided with a positioning mechanism and a bearing mechanism installed on the positioning mechanism and used for bearing and fixing the cable, and the bottom plate is further provided with a leveling mechanism used for leveling the bottom plate. According to the invention, the lifting mechanism cooperates with the action of the cable pulling piece, the two ends of a broken cable can be pulled to be close to each other, and the cable can be lifted to a specified height under the action of the lifting mechanism, so that the working intensity of workers is reduced, and the high-altitude wiring efficiency and quality are improved.

The invention discloses a wear-resistant flame-retardant insulated overhead cable, which relates to the technical field of cables and comprises asbestos. A wire core for conducting current is arranged near the center of the asbestos, and a plurality of conductors for transmitting electric energy are arranged inside the asbestos. When the wear-resistant flame-retardant insulated overhead cable is arranged outdoors in a residential area, firstly one of the connecting rings is passed through the outer surface of a mounting ring, and then the cable outer sheath is driven to pass through the mounting ring and is sleeved on the outer surface of the cable, so that two telescopic tubes are both sleeved on the outer surface of the cable, and then the other connecting ring is fixed on the outer surface of the mounting ring, and then the other connecting ring can be moved to the other end of the overhead cable and fixed on the outer surface of the other mounting ring, so that the cable outer sheath is sleeved on the outer surface of the cable to protect the cable, thereby solving the problem of low wear resistance of the overhead cable for residential areas affected by the external environment in the prior art.

A drive assembly for an overhead cable management system has an overhead sheet including a first surface and a second surface disposed opposite to the first surface and arranged facing a ground. The drive assembly includes a first roller adapted to be arranged on the first surface and move on the first surface and having at least one first magnet. The drive assembly also includes a second roller adapted to magnetically couple with the first roller and is disposed underneath the overhead sheet, contacting the second surface. The second roller includes at least one second magnet to magnetic couple the second roller assembly with the first roller assembly.

The invention discloses an environment-friendly long-life crosslinked polyethylene insulated overhead cable, and relates to the technical field of cables, the cable comprises a polyethylene insulating layer, a sliding ring groove plate is embedded in the inner side of the polyethylene insulating layer, an annular sliding groove is formed in the inner side of the sliding ring groove plate, an upper rolling column is slidably mounted on the inner side of the annular sliding groove, and a lower rolling column is slidably mounted on the inner side of the upper rolling column. The device is scientific and reasonable in structure and safe and convenient to use, the heat dissipation speed is increased when heat dissipation is needed, a certain amount of heat is generated for heat preservation in cold days, the heat dissipation efficiency is improved, the heat dissipation efficiency is improved, the heat dissipation efficiency is improved, and the service life of the device is prolonged. And then the temperature of the cable is increased in cold days, so that the polyethylene insulating layer can be prevented from being embrittled and damaged, the service life of the cable is prolonged, the cable is prevented from being damaged, and the stable proceeding of power transmission is further ensured.

The invention discloses a blasting deicing device with a guide cylinder and a deicing method, relates to the technical field of overhead cable deicing, aims at improving the deicing operation of an overhead cable, and particularly aims at improving the deicing operation of the overhead cable by taking impact force generated in blasting action as basic power for blasting deicing. The method is characterized in that an upper clamping frame and a lower clamping frame are optimized to independently fix the overhead cable, and instant impact force generated when blasting filler is ignited is applied to the overhead cable, so that the overhead cable swings automatically, and the purpose of naturally shaking off ice covering the overhead cable is achieved. In the whole process, the single overhead cable in the same section can be quickly deiced, the operation difficulty is relatively low, power failure treatment is not needed, on this basis, the eccentric mode between the V-shaped groove in the lower buffer pad and the guide cylinder is further optimized, and the operation efficiency is improved. And by combining the thickness of the ice layer, the overall mounting mode and the linkage in the two actions of hoisting and mounting are changed, so that the deicing effect is adaptively improved, and the operation steps are simplified.

The invention discloses a low-temperature-resistant and tensile 10kv aerial cable, and relates to the technical field of cables, a tensile heat preservation assembly is arranged on the outer side of a spiral inner conductor, the tensile heat preservation assembly comprises an inner insulating layer, a middle supporting piece is arranged among three inner conductors, a heat conduction spiral pipe is connected to the outer side of a heat conduction braided pipe in a sleeving mode, and a tensile braided pipe is connected to the outer side of a middle insulating pipe in a sleeving mode. The outer side of the tensile braided tube is sleeved with a polyurethane foam thermal insulation pipe, one side of the interior of the degradation outer bag is filled with an expansion rubber strip, and an anti-freezing protection assembly is installed on the outer side of the polyurethane foam thermal insulation pipe. In the use process of the cable, by means of the friction force effect, the interior of the cable is twisted mutually, the contact area is increased, and the friction force is increased; the friction force can prevent the spiral inner conductor, the middle supporting piece and the heat conduction spiral pipe from sliding when bearing external force, the overall tensile strength of the cable is enhanced, meanwhile, the middle supporting piece and the heat conduction spiral pipe inside can deform to absorb energy, the cable is not prone to being snapped, and the internal strength is higher.

The utility model discloses a guide cylinder structure adopting a blasting deicing mode, and relates to the technical field of blasting deicing, a detonation filler is arranged in a blasting guide cylinder, an electric ignition structure is provided with an ignition structure corresponding to the detonation filler, and a lower buffer protection pad is installed at the position, corresponding to a blasting assembly, of a lower clamping frame. And a V-shaped groove is formed in the lower buffer protection pad. According to the blasting deicing principle, based on a high-strength blasting guide cylinder, impact force instantly released during combustion of detonation filler serves as source power for vibration deicing of the overhead cable, a lower buffering protection pad serves as a primary protection structure of the overhead cable, and particularly, a V-shaped groove is obtained through optimization and improvement in the lower buffering protection pad; the blasting guide cylinder is used for fully clamping the overhead cable, and the key point is that a staggered clamping position between the blasting guide cylinder and the overhead cable is used for avoiding direct damage to the overhead cable caused by blasting impact force on one hand, facilitating the separation process between the blasting guide cylinder and the overhead cable on the other hand, and particularly improving the deicing efficiency.

The invention relates to the field of inspection unmanned aerial vehicles, in particular to an overhead line power inspection unmanned aerial vehicle. An overhead line electric power inspection unmanned aerial vehicle comprises an unmanned aerial vehicle body, a camera and the like. And four cameras are mounted on the unmanned aerial vehicle body. According to the unmanned aerial vehicle, by controlling the releasing length of the mooring rope, the strength of the deicing bar for impacting the cable body is controlled, so that deicing work of overhead cables of different thicknesses is achieved, damage to the cable body is reduced, and after the folded deicing bar is limited through the guide column and the limiting sleeve, the situation that the deicing bar and the unmanned aerial vehicle body move asynchronously is effectively avoided, and the deicing efficiency is improved. And the heater melts ice and snow attached to the surfaces of the ice removing bars after impacting the cable body, and the situation that the ice and snow attached to the surfaces of the ice removing bars are increased, the overall load of the unmanned aerial vehicle body is increased, energy consumption of the unmanned aerial vehicle body is increased, and the endurance time of the unmanned aerial vehicle body is shortened is avoided.

The invention relates to the technical field of electric power engineering, in particular to a tool carrying platform based on unmanned aerial vehicle overhead cable hot-line work and a working method.The tool carrying platform comprises a mounting frame and a suspension frame which are connected through an electromagnetic lock, the mounting frame is located on the upper top face of a work tool, and the suspension frame is connected with an unmanned aerial vehicle through an insulating rope; a hanging ring connected with the tail end of the insulating rope extends into a U-shaped groove of the electromagnetic lock; the electromagnetic lock comprises a mounting plate with the surface provided with a positioning column and a limiting rib, the positioning column is sleeved with a torsional spring and a locking plate, the limiting rib is fixedly connected with an electromagnet, and the electromagnet is connected with the limiting column through a spring. The locking plate comprises a rotating part connected to the positioning column in a sleeving mode, and the rotating part is provided with a long spring bolt, a short spring bolt and an arc-shaped protrusion arranged in the circumferential direction, wherein the long spring bolt and the short spring bolt are arranged side by side. When the locking plate rotates to a set angle, locking is achieved, in the locking state, the long spring bolt is located at the groove bottom of the U-shaped groove, and the short spring bolt penetrates through the hanging ring and is located in the space above the long spring bolt; an included angle area formed by the edge of the bulge and the surface of the rotating part is clamped with the limiting column.

The invention discloses an overhead line robot combining wheel type walking and wriggling walking and a line climbing method. The overhead line robot mainly comprises a rack, and a walking device and a wriggling device are installed on the rack; the walking devices are arranged at the two ends of the machine frame respectively, each walking device comprises a supporting frame, and traveling wheels are installed in the supporting frames and are driven by a driving motor in a transmission mode. The peristaltic device comprises a first clamping mechanism and a second clamping mechanism, and the first clamping mechanism and the rack are relatively fixed; the second clamping mechanism is driven by a pushing driving mechanism to move in the length direction of the cable, and the pushing driving mechanism is fixed to the rack. According to the overhead line robot combining wheel type walking and wriggling walking and the line climbing method, the robot can walk between large-dip-angle overhead cables and cross obstacles such as damping lines and stockbridge dampers arranged between high-voltage lines.

The present application relates to overhead cable technical field, especially it relates to a heat dissipation and humidity control overhead cable, in order to solve the existing cable only adopts the passive resistance way of simple heat insulation layer, ultimately leading to reduce the effect of cable heat dissipation, the present application introduces the outside air into the cooling cavity through the rectangular groove on the surface of the armor layer, cooperates with the inclined baffle, blocks the rainwater at the same time, utilizes the coolant in the low temperature auxiliary coolant cavity, when the cable core generates heat and transmits the heat to the insulation layer, the spiral pipe and the spiral fin closely attached to the outer surface of the insulation layer will absorb the heat, and the coolant in the aluminum spiral pipe will cool the spiral fin and the insulation layer, since the coolant in the liquid cavity always keeps low temperature, and the coolant in the liquid cavity and the coolant in the spiral pipe are connected through the L tube, at this time, the coolant in the spiral pipe can also keep low temperature, ultimately improves the effect of cable core heat dissipation.

The invention discloses a scratch-resistant and wear-resistant aerial cable and a production process thereof, and relates to the field of aerial cables, the scratch-resistant and wear-resistant aerial cable comprises a conductor, an insulating layer and a sheath layer from inside to outside, and the sheath layer comprises the following raw materials in parts by weight: 60-80 parts of polyurethane resin, 15-25 parts of a heat-conducting filler, 10-15 parts of a flame retardant, 0.8-1.0 part of an ultraviolet light absorber and 1-1.5 parts of an anti-hydrolysis agent. The polyurethane-based cable sheath material has excellent wear resistance, and meets the use requirements of scratch resistance and wear resistance of overhead cables. The synthesized heat-conducting filler comprises boron nitride, a phenothiazine structure, secondary hydroxyl and the like, so that the heat dissipation performance, the mechanical property and the aging resistance of the cable are improved. The synthesized anti-hydrolysis agent comprises a polyurethane structure, a polymeric carbodiimide structure and a polysiloxane chain, so that the hydrolysis resistance and heat resistance of the cable are improved.

The invention discloses an electric power overhead cable sag adjusting device which comprises an installation part, a supporting cross rod is fixedly installed on the installation part, an installation disc is installed on the supporting cross rod in a sliding mode, an adjusting disc is rotatably installed on the installation disc, the adjusting disc is connected with an adjusting drive, an observation cylinder is installed at the upper end of the adjusting disc, and a sight glass is installed at the front end of the observation cylinder. An observation line is arranged in the middle of the sight glass, an eye view window and a camera module are mounted at the rear end of the observation cylinder, the traction pulley is connected with a traction rope, the traction rope is connected with a winch, the traction rope penetrates through the traction pulley and then is connected with a line clamping device, and a display is mounted on the winch. According to the invention, the observation cylinder is arranged at the measurement position, and the observation content is transmitted to the display through the camera module, so that the work of observing through a marker post by an observer and the work of adjusting a tightener by a worker on a tension rod are reduced, and the work intensity and danger are reduced.

This invention discloses a vibration damper structure for overhead cables, comprising: a base; a clamping assembly mounted on the base for clamping overhead cables; a reinforcing assembly connected to the base; spacing adjustment assemblies respectively mounted on opposite sides of the reinforcing assembly; and a vibration damper body detachably connected to the end of the spacing adjustment assembly. The spacing adjustment assembly includes: an adjusting seat, two bearing rings mounted on opposite ends of the adjusting seat, a lead screw connected between the two bearing rings, a guide rod disposed within the adjusting seat, a slider seat meshing with the lead screw, and a positioning shaft tube fastened to the slider seat. The guide rod is located on one side of the lead screw and passes through the slider seat, and the vibration damper body is connected to the positioning shaft tube. The vibration damper structure for overhead cables implementing this invention allows for adjustment of the hammer spacing to adapt to the wind vibration resistance performance of cables of different diameters; it has a simple structure and a wide range of applications.

The invention discloses a silane crosslinked polyethylene overhead cable material for laser etching and a preparation method thereof. The raw materials comprise a material A and a material B according to a weight ratio of 95: (4-6), wherein the material A comprises the following components in parts by weight: 65-75 parts of LLDPE (Linear Low Density Polyethylene) resin 1, 10-25 parts of LLDPE resin 2, 3-4 parts of a processing aid, 1.9-2.1 parts of silane, 0.095-0.105 part of an initiator and 0.09-0.11 part of an antioxidant; and the material B comprises the following components in parts by weight: 50 parts of LLDPE resin 1, 1.9-2.1 parts of catalyst, 3-5 parts of antioxidant, 49-51 parts of carbon black master batch for laser etching and 5 parts of nano filler. According to the invention, the nano filler and the laser-engraved carbon black master batch are added into the material B, and the chemical reaction between the nano filler and the laser-engraved carbon black master batch is utilized, so that the definition of the extruded silane crosslinked polyethylene overhead cable is not influenced by the content of carbon black during laser lettering. The prepared overhead cable material has the advantages of excellent processability, high extrusion speed and smooth and fine extrusion surface.

The invention discloses a railway overhead cable inspection robot, and relates to the technical field of overhead line inspection, the railway overhead cable inspection robot comprises an inspection box, the upper surface of the inspection box is fixedly connected with a working plate, the upper surface of the working plate is fixedly connected with a motor, and the upper surface of the working plate is rotatably connected with a rotating shaft; the outer side of the rotating shaft is fixedly connected with a rotating plate, and the upper end of the rotating shaft is fixedly connected with the output end of a motor. According to the railway overhead cable inspection robot, when the device moves to a cable butt joint part, two groups of rotating plates synchronously release radial extrusion on a first airbag, the volume of a second airbag is synchronously reduced, displacement generated by deformation of the second airbag can drive a driving plate to reversely rotate, and at the moment, two groups of laser detectors can synchronously move outwards under the driving action of a pulling plate; in view of the fact that the width of the cable butt joint part is obviously larger than that of a single overhead cable, the laser detector achieves more accurate coverage detection of the butt joint area through the design of enlarging the distance between the detection modules.

The invention relates to an overhead cable sag adjusting device which comprises a mounting base and sag adjusting assemblies, the sag adjusting assemblies comprise the first sag adjusting assembly, the second sag adjusting assembly and the third sag adjusting assembly, a vertical plate is arranged above the mounting base, the first sag adjusting assembly is arranged in front of the vertical plate, and the third sag adjusting assembly is arranged in front of the vertical plate. The first sag adjusting assembly is longitudinally and slidably connected with the vertical plate; a second sag adjusting assembly is arranged in front of the first sag adjusting assembly, and the second sag adjusting assembly is in longitudinal lifting connection with the first sag adjusting assembly; a transverse plate is installed at the bottom of the first sag adjusting assembly, follow-up sag adjusting assemblies are arranged on the two sides of the upper portion of the transverse plate, and cable pushing assemblies and third sag adjusting assemblies are arranged above the follow-up sag adjusting assemblies. The device has the advantages of being reasonable in structure, capable of improving working efficiency, time-saving, labor-saving, high in error-tolerant rate, convenient to operate and good in safety.

The invention discloses a position optimization method and device for a non-contact magnetic sensing array of a single-circuit overhead line, equipment and a medium, and relates to the technical field of non-contact measurement. The optimization method comprises the following steps: establishing a magnetic induction intensity model of a sensor based on spatial position parameters of a single-circuit three-phase aerial cable and a to-be-arranged magnetic sensing array; establishing an error model of a measured value and an actual value based on the measured value of the magnetic sensing array obtained by the magnetic induction intensity model; converting the problem of solving the error minimization of the error model into the problem of solving the matrix condition number minimization of the sensing coefficient matrix; and taking the matrix condition number as a fitness function, and solving the optimal layout position of the magnetic sensor array through a particle swarm optimization algorithm. According to the invention, a position optimization scheme for arranging the magnetic sensing array on the tower is provided, the problems of measurement and installation of sensors arranged on a non-tower target are solved, and the inverse solution capability of the sensing array to a space electromagnetic field is enhanced.

The invention relates to the technical field of overhead cables, in particular to an overhead conductor cable with a split type diversion mechanism, which comprises a cable body, and the cable body comprises a conductor, a conductor shield, an insulator, an insulation shield, a copper strip shield, a filler, a wrapping tape, an inner sheath, an armor and an outer sheath from inside to outside. According to the overhead conductor cable with the split type flow guide mechanism, the middle flow guide frame is arranged on the armor, and the internal flow guide pipe inserted into the middle flow guide frame is communicated with the split type flow guide mechanism; according to the split type diversion mechanism, diversion nozzles on two sides are inserted into lateral openings of an internal diversion pipe to form a circulating flow channel on a cable body, so that the heat dissipation performance in the cable can be greatly improved, and the cable can stably and efficiently run for a long time; the plurality of annular assembling grooves are formed in the outer side of the outer sheath, the split type flow guide mechanisms are installed on the annular assembling grooves to be fixed to the cable, splicing can be carried out in the later period, and the installation mode is simple and rapid.

The embodiment of the application discloses an overhead cable fault prediction system, which comprises: a parameter calculation module configured to acquire first overhead cable images and second overhead cable images collected at different times, identify cable bending degrees in the first overhead cable images and the second overhead cable images, and obtain first bending parameters and second bending parameters; a scale determination module configured to determine a bending change scale of the cable based on the first bending parameters and the second bending parameters; and a fault result prediction module configured to obtain cable fault prediction parameters based on the bending change scale and time data of the different times, and predict cable faults based on the cable fault prediction parameters. The scheme solves the problem that most schemes in the prior art can only perform fault monitoring but cannot achieve efficient fault prediction, and provides a feasible scheme to realize prediction of cable faults.

The utility model discloses an insulating overhead cable with long service life, which comprises an insulating overhead cable body, a protective rotating cylinder is arranged outside the insulating overhead cable body, a wear-resistant layer is arranged on the outer surface of the protective rotating cylinder, a smooth coating is arranged on the outer surface of the wear-resistant layer, and the outer surface of the smooth coating is provided with a protective layer. A mounting hole is formed in the inner wall of the protective rotating cylinder, and a plastic ball is movably mounted in the mounting hole; and the mounting groove is formed in the outer surface of the insulated aerial cable body. According to the insulated overhead cable with the long service life, the rotatable protective rotating cylinder is arranged on the surface of the insulated overhead cable body, and when birds stay on the protective rotating cylinder, the protective rotating cylinder is stressed to rotate, so that the birds cannot stay on the surface of the protective rotating cylinder, and the birds are prevented from damaging the surface of the insulated overhead cable body; and meanwhile, birds are prevented from staying on the insulated overhead cable, so that the insulated overhead cable is prevented from being damaged due to excessive tensile force, and the service life of the insulated overhead cable body is further prolonged.

The utility model provides a fixing device for overhead cable installation, which relates to the technical field of cable fixation and comprises a trapezoidal plate, an L-shaped plate is fixedly connected to the surface of the trapezoidal plate and close to the bottom, and the top of the L-shaped plate is provided with a first square groove and three grooves; according to the utility model, the cable is embedded into the groove, then the convex plate is covered, the convex plate can extrude the trapezoidal clamping plate in the process, the trapezoidal clamping plate can be embedded into the cross-shaped hole, and after the clamping groove is flush with the trapezoidal clamping plate, the spring can push the cross-shaped plate to enable the trapezoidal clamping plate to be embedded into the clamping groove. According to the cable fixing device, the effect of conveniently fixing the convex plate can be achieved, at the moment, a rotating disc is rotated to drive a screw rod to rotate, the screw rod rotates to enable a clamping plate to descend and be embedded into a first square groove, and the effect of clamping and fixing a cable in a groove can be achieved; therefore, the cable can be conveniently installed and fixed without a tool, and the operation safety can be improved.

The present invention discloses an overhead cable installation rack for electric power construction, which relates to the technical field of cable installation racks and includes a fixed ring, a mounting rack detachably installed on the fixed ring, and two guiding wheel assemblies detachably installed on the mounting rack in the horizontal direction; the guiding wheel assembly includes a support seat, a first wire wheel rotatably assembled on the support seat, and a second wire wheel slidably installed on the support seat through a sliding drive assembly, and the second wire wheel is above the first wire wheel. During the pulling process of the present invention, when the pulling force disappears and the cable slides to the right under its own weight, the second wire wheel slides in an arc above the first wire wheel and the distance between the second wire wheel and the first wire wheel continuously decreases, so that the clamping force of the first wire wheel and the second wire wheel on the cable increases, and the cable is clamped and locked by the first wire wheel and the second wire wheel, thereby avoiding the sliding of the cable and affecting the laying work of the cable.

This utility model relates to the field of power transmission technology, specifically to an aluminum core cross-linked polyethylene insulated overhead cable, comprising four cable cores, a fixing structure, a protective layer, several raised rings, and a positioning component. The four cable cores are arranged in a ring, the fixing structure covers the outside of the four cable cores, the protective layer covers the outside of the fixing structure, the raised rings are fixedly connected to the protective layer, and the positioning component is located outside the raised rings. The positioning component includes two fixing rings, a connecting block, and two fixing blocks. The two fixing rings respectively cover the outside of the corresponding raised rings, the two ends of the connecting block are rotatably connected to the two fixing blocks respectively, and the two fixing blocks are fixedly connected to the corresponding fixing blocks respectively. The two fixing blocks are bolted together. Through the above structural design, the problem of unstable installation of the insulation wear-resistant layer and easy slippage of the cable during hoisting in the prior art is solved.

An HPVC power pipe convenient for mounting an overhead cable relates to the technical field of HPVC power pipes, and comprises a starting outer pipe and a connecting outer pipe which can be connected with each other, a driving inner pipe and a driven inner pipe which can be connected with each other, a driving mechanism, and a limiting support frame detachably mounted on the starting outer pipe or the connecting outer pipe, the limiting rod is detachably installed on the limiting supporting frame, and the traction block can be installed on the limiting rod in a sliding mode. A driving inner pipe is coaxially and rotationally mounted in the starting outer pipe; a driven inner pipe is coaxially and rotatably mounted in the connecting outer pipe; spiral grooves are formed in the inner walls of the driving inner pipe and the driven inner pipe; a pin shaft which can be mounted in the spiral groove in a sliding manner is fixedly arranged on the traction block; the driving mechanism comprises a mounting frame detachably mounted on the starting outer pipe, a driving motor fixedly mounted on the mounting frame, a driving gear rotationally mounted on the mounting frame, and a driven gear ring coaxially and fixedly mounted on the driving inner pipe and meshed with the driving gear.