183results about "Adjusting/maintaining mechanical tension" patented technology

The invention discloses a quick-insertion type strain clamp which comprises an insulating shield, a clamp pressing plate, a wedge block sliding groove, a wedge-shaped sliding block, a compression spring, a pressing type plug pin assembly, an insulator connecting block, an end insulator, a wire plug, a jumper plug, a nylon nut, a T-shaped copper wire clamp and a spring contact finger. The wedge block sliding groove, the pressing type plug pin assembly, the T-shaped copper wire clamp and the insulator connecting block are sequentially installed on the wire clamp pressing plate and are combined into a whole through the wire clamp pressing plate, and the insulating protective cover wraps the outer side of the whole structure. The strain clamp designed by the invention forms a whole body, a wire is pressed during construction, and the installation can be completed by inserting a plug according to requirements. An integral insulation form is adopted, the insulation performance is better, the U-shaped structure is adopted at the end part, and the cable can be suitable for tower types of various angles, and the universality is good.

The invention relates to the technical field of electric power fittings, in particular to an anti-loosening electric power fitting for high-voltage wire clamping, which comprises a fitting frame body, the side wall of the fitting frame body is fixedly connected with a bearing plate, the two side walls of the fitting frame body are both provided with wire clamping guide grooves, and the bearing plate is fixedly connected with the wire clamping guide grooves. And inner arc wire pressing blocks are connected in the two wire clamping guide grooves in a sliding manner. According to the invention, through the arranged automatic adjusting assembly, the clamping force of the wire can be automatically adjusted so as to ensure that a connection point is continuously kept in an optimal pressing state, through the arranged screw locking assembly, the clamping force can be kept stable for a long time, through the arranged locking opening and closing assembly, the intelligent switching of a locking state can be realized, and the clamping force is ensured to be stable for a long time. According to the anti-loosening device, accurate data support can be provided for automatic adjustment through the arranged side end loosening sensing assembly, fine adjustment compensation of the position of the inner arc wire pressing block can be achieved through the arranged side end adjusting assembly, and therefore the anti-loosening function is effectively achieved.

The utility model discloses a strain clamp with stable connection, which comprises a clamp body, two inner sides of the clamp body are provided with clamping pieces, the clamping pieces are provided with pushing blocks, the pushing blocks are fixedly connected with the clamp body through screws, the clamping pieces are provided with threading holes for accommodating wire groups, and the threading holes are connected with the clamping pieces through screws. The wire clamp body is provided with a plurality of wire penetrating holes, the wire penetrating holes are provided with a plurality of clamping plates at equal intervals from left to right, the inner walls of the clamping plates are provided with a plurality of tooth parts protruding at equal intervals, and springs are arranged in the clamping pieces and act on the two ends of the clamping plates so that the clamping plates can move towards the middle of the wire clamp body. The tooth part is embedded into the outer wall of the wire group, so that the friction force is enhanced; the clamping force of the clamping plate is dynamically adjusted by pushing the clamping plate through the spring according to the real-time change of the diameter of the wire set, so that the tooth part is always kept in close contact with the outer wall of the wire set, the phenomena of connection loosening and loosening are effectively prevented, and the connection stability of the wire clamp body and the clamping plate is further improved through the screw.

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 utility model relates to the technical field of strain clamps, and discloses a split type strain clamp for a large-cross-section wire, which comprises a strain clamp main body, a wire main body is arranged in the strain clamp main body, a splicing mechanism is arranged at the top of the strain clamp main body, a fixing mechanism is arranged on the right side of the splicing mechanism, and a clamping mechanism is arranged on the right side of the fixing mechanism. The splicing mechanism comprises a splicing assembly and a locking assembly, the splicing assembly is arranged at the top of the strain clamp body, the locking assembly is arranged on the left side of the splicing assembly, and the fixing mechanism comprises a clamping assembly and a limiting assembly. According to the split type strain clamp for the large-section wire, through the arrangement of the splicing mechanism, a worker can lock or unlock the fixed screw cylinder I and the sleeve frame only by rotating a bolt, so that the worker can disassemble and assemble the wire frame conveniently, the worker can disassemble and assemble the wire frame according to use requirements, and the split type strain clamp is convenient for the worker to use.

This invention discloses a rapid assembly method for an anti-detachment tension buffer spacer and its main structure, belonging to the field of power fittings technology for transmission lines. It includes a main structure, a rubber core, and pre-twisted wire. The main structure comprises two relatively spaced frames, and multiple wire clamps and multiple rigid arc tubes disposed between the two frames. The rubber core serves as a buffer layer covering the outer periphery of the transmission line, and the pre-twisted wire is wound and wrapped around the outer periphery of the combination of the transmission line and the rubber core. The invention also includes an assembly method for rapidly manufacturing the main structure based on a dedicated quick-assembly workbench for anti-detachment spacers. This invention achieves rapid assembly of the anti-detachment spacer through multi-station synchronous operation and dynamic bolt control strategies, significantly shortening the assembly cycle of a single product and greatly improving batch production efficiency.

The invention discloses a distribution line anti-breaking mechanical support device and a tension control method, the device comprises a support, a fixed end and a movable end, the movable end is slidably connected with the other side of the top of the support, the tops of the fixed end and the movable end are provided with semicircular grooves, and the tops of the fixed end and the movable end are provided with wire clamps. A wire is arranged in the semicircular groove, a buffering section is arranged on the section, located between the fixed end and the movable end, of the wire, the bottom end of the support is fixedly connected with a tension buffering mechanism connected with the movable end, and the tension buffering mechanism is used for driving the movable end to move in the first direction when the tension of the wire is increased so as to release the effective length of the wire. The invention relates to the technical field of power line protection. According to the mechanical supporting device for preventing the distribution line from being broken and the tension control method, the tension change of the electric wire can be dynamically responded, the effective length of the electric wire is automatically adjusted, overtension is effectively buffered, the electric wire is prevented from being broken, and state monitoring and remote management capabilities are achieved.

The invention relates to the technical field of insulated wire clamps, in particular to a cable threading insulated wire clamp with an internal locking structure, which comprises a shell assembly, a guide assembly and a locking assembly. A ratchet wheel and pawl assembly is arranged in the guide assembly, a rack meshed with a pawl is arranged in the locking assembly, and the ratchet wheel and the rack cooperate to form a mechanical one-way locking mechanism, so that the cable cannot return after penetrating. Meanwhile, a wedge-shaped auxiliary limiting assembly with a spring is further arranged in the cable clamp, and radial self-adaptive holding can be achieved in the cable locking process. By integrating guiding, one-way locking and radial clamping functions, positioning, retreating prevention and fixing of a cable are completed at a time in the threading process, the defects of an existing cable clamp in the aspects of retreating prevention, function integration and self-adaptive clamping are effectively overcome, and the cable clamp has the advantages of being easy and convenient to install, high in reliability, high in applicability and good in cable protection.

The present application relates to the technical field of electric power fittings, in particular to a high-voltage wire clamping electric power fitting capable of preventing loosening, comprising a fitting frame body, a load-bearing plate fixedly connected to the side wall of the fitting frame body, wire clamping guide grooves formed in the side walls of the fitting frame body, and inner-arc wire pressing blocks slidably connected to the wire clamping guide grooves. The automatic adjustment assembly provided by the present application can automatically adjust the wire clamping force, thereby ensuring that the connection point continuously maintains the optimal pressing state. The screw locking assembly provided by the present application can ensure that the clamping force remains stable for a long time. The locking opening and closing assembly provided by the present application can intelligently switch the locking state. The side end loosening sensing assembly provided by the present application can provide accurate data support for automatic adjustment. The side end adjusting assembly provided by the present application can fine-tune and compensate the position of the inner-arc wire pressing blocks, thereby effectively preventing loosening.

The application discloses a self-adaptive wire clamp module and a self-adaptive cable clamp, wherein the self-adaptive wire clamp module comprises a shell and a plurality of telescopic cable clamping mechanisms arranged in the inner cavity of the shell; a plurality of guide holes are arranged on the shell in contact with the cable in the axial direction of the cable; according to the softening degree of the cable insulation layer, the clamping portions of the plurality of telescopic cable clamping mechanisms are extended out of the shell through the one-to-one corresponding plurality of guide holes to compress the cable by corresponding lengths. The self-adaptive wire clamp module quantizes the cable into smaller sections according to the number of the plurality of telescopic cable clamping mechanisms on the clamped cable section; the softening degree of the cable insulation layer caused by different temperatures is different; the length of the clamping portion corresponding to each small cable section is different; and the self-adaptive clamping of the cable under different temperature working environments is achieved, and the stability of the clamped cable is improved. The application improves the stability of the wire clamp clamped cable under different temperature working environments.

The heart-shaped ring comprises a heart-shaped ring body, the heart-shaped ring body comprises an annular part, the upper end and the lower end of the outer wall of one side of the annular part are integrally provided with extending parts which are distributed in parallel towards one side, the outer wall of the periphery of the annular part is provided with an annular groove used for containing the strain clamp, and the annular groove is provided with an annular groove used for containing the strain clamp. Clamping structures are detachably connected to one ends of the two extending parts, each clamping structure comprises a clamping block, limiting grooves corresponding to the U-shaped rings are formed in the surfaces of the two sides of each clamping block and the surface of the end, facing the annular part, of each clamping block, and limiting structures are arranged on the surfaces of the top and the bottom of each clamping block; the clamping block is connected with the extending part through a fastener, the clamping block is used for replacing a traditional bolt to achieve hooking of the U-shaped ring, the limiting grooves corresponding to the U-shaped ring in structure are formed in the surfaces of the three sides of the clamping block so that axial limiting of the U-shaped ring can be achieved, and the possibility that the U-shaped ring rotates, so that the non-bent part of the U-shaped ring deforms due to stress is avoided.

The utility model discloses a cable clamping mechanism for electrical installation engineering, which is characterized in that a supporting plate is arranged on the side surface of an installation plate, a positioning disc is arranged at one end, far away from the installation plate, of the supporting plate, a plurality of first limiting seats are uniformly distributed on one side of the positioning disc, a first transmission rod is slidably connected onto the first limiting seats, and a second transmission rod is slidably connected onto the first transmission rod. And a [-shaped limiting frame is arranged at one end of the first transmission rod, two arc-shaped clamping blocks are symmetrically arranged on the inner side of the limiting frame, a first limiting rod is arranged on one side of each arc-shaped clamping block, and the first limiting rods penetrate through the side wall of the limiting frame. According to the cable tensioning device, multiple sets of arc-shaped clamping blocks are arranged, a transmission disc is rotated, and a first transmission rod can drive the multiple sets of arc-shaped clamping blocks to slide on a first limiting seat at the same time under the cooperation effect of an adjusting knob and a first sliding groove, so that the tensioning degree of a cable can be adjusted, and the cable can be prevented from being broken due to too large tensioning force; and the applicability of the cable clamping mechanism is improved.

This invention provides a suspension wire support hardware and suspension wire support method that reduce the burden on workers during the anchoring work of communication cables with suspension wires, while improving work efficiency. [Solution] The suspension wire support fitting 10 comprises a hook portion 11 supported by the anchoring portion of the support, a first grip portion 12 extending spirally from one end of the hook portion 11, and a second grip portion 13 extending spirally from the other end of the hook portion 11 and gripping the suspension wire 40 by wrapping around the first grip portion 12. A friction-increasing material is applied to the inner surfaces of the first grip portion 12 and the second grip portion 13, and the outer surfaces of the first grip portion 12 and the second grip portion 13 and the inner surfaces to which the friction-increasing material is applied are covered with a resin coating 14.

The utility model relates to the technical field of power transmission lines, in particular to a power transmission line wire clamping device, which comprises a clamping seat, a fixed clamping plate is fixed at one end of the clamping seat, a movable clamping plate is arranged above the fixed clamping plate, a connecting rod part is mounted on the surface of the clamping seat, and the connecting rod part drives the movable clamping plate to be matched with the fixed clamping plate to clamp and fix a wire. An anti-skid protruding strip is arranged between the fixed clamping plate and the movable clamping plate, a reinforcing mechanism is arranged on the surface of the fixed clamping plate and the surface of the movable clamping plate, a locking screw and a reinforcing assembly are arranged in the reinforcing mechanism, a replacing mechanism is arranged on the surface of the anti-skid protruding strip, and a connecting block, a positioning sliding groove and a fastening bolt are arranged in the replacing mechanism. According to the utility model, not only is the firmness degree of the lead clamping device in use improved, but also the convenience degree of the lead clamping device in replacement of the anti-slip raised lines is improved.

The invention discloses a wear-resistant insulating strain clamp and a preparation method thereof, and belongs to the technical field of cable or wire installation. The wire clamp comprises an integrated insulating shell, a layered clamping lining and an elastic locking mechanism, the layered clamping lining sequentially comprises a wear-resisting layer, an elastic buffering layer and an insulating layer from inside to outside, and the inner surface of the wear-resisting layer is provided with friction textures or coarsening structures so as to increase friction and resist sliding. The elastic locking mechanism is composed of a spring, a locking mandrel and a locking block, the clamping face of the locking block is an arc face or a V-shaped face and is provided with an insection structure, and self-locking clamping which is tighter and tighter when being pulled is formed under the action of spring pre-tightening and external pulling force. The limiting seat limits the stroke of the locking block, and the positioning ring achieves axial positioning and limiting. Compared with the prior art, the wear-resistant insulation strain clamp has the advantages of insulation protection, wear resistance, vibration reduction, high grip strength, slippage prevention and high assembly reliability.

The utility model discloses a high-voltage power transmission network connection structure, and relates to the technical field of power transmission equipment, the high-voltage power transmission network connection structure comprises a guide rail mechanism, and the left and right sides of the guide rail mechanism are oppositely provided with longitudinally arranged guide grooves. According to the utility model, the whole structure is convenient to install and fix through the arranged installation holes, the installation efficiency is improved, the lead assembly inside the guide frame mechanism and the servo push rod outside the guide frame mechanism are convenient to install and fix, and the guide frame mechanism is convenient to install and fix. The movable assembly, the contact rod and other parts can be accurately moved to the designated position, accurate butt joint of the connecting lantern ring and the wire assembly is achieved, compared with a traditional connection mode, complex calibration and fixing steps are not needed, operation is more convenient, connection and disconnection operation can be rapidly completed, and construction difficulty is reduced.

The utility model relates to the technical field of power transmission lines, in particular to an extra-strong steel core soft aluminum stranded wire tightening device with a wire displacement prevention function, which comprises a lower clamping seat, one end of the lower clamping seat is rotatably connected with an upper clamping seat, the inner sides of the upper clamping seat and the lower clamping seat are provided with clamping rings, the bottom of the lower clamping seat is fixedly provided with a safety ring, and the safety ring is fixedly connected with the lower clamping seat. A wire tightening mechanism is arranged between the lower clamping seat and the upper clamping seat, an anti-skid plate and a wire tightening assembly are arranged in the wire tightening mechanism, a replacement mechanism is arranged on the outer side of the clamping ring, and the replacement mechanism is composed of a limiting piece, a fastening stud, a guide sliding groove and a guide sliding strip. According to the utility model, the phenomenon of wire displacement during use of the wire tightening equipment is avoided, the wire tightening equipment can tighten stranded wires with different sizes, and the flexibility of the wire tightening equipment during use is improved.

An anti-drop wire clamp device for a power transmission line across a resident gathering area comprises a connecting assembly and a wire clamp, the wire clamp is fixedly arranged on a wire, the connecting assembly comprises a main adjusting plate and a plurality of auxiliary adjusting plates, the main adjusting plate is connected with a tower, a dovetail groove is formed in the edge of the main adjusting plate, and the auxiliary adjusting plates are connected with the dovetail groove. A plurality of dovetail blocks matched with the dovetail grooves are arranged in the dovetail grooves in a sliding mode, the dovetail blocks are connected with the auxiliary adjusting plates in a one-to-one correspondence mode, the auxiliary adjusting plates are connected with the wires in a one-to-one correspondence mode through connecting pipes, reinforcing assemblies are further connected between the auxiliary adjusting plates and the wires, and each reinforcing assembly comprises at least one adjusting rod; one end of the adjusting rod is connected with a wire through a wire clamp, and the other end of the adjusting rod is connected with the auxiliary adjusting plate. According to the utility model, the wire of a power transmission line crossing a resident gathering area is prevented from dropping, and the flexibility of wire tension adjustment is improved at the same time.

The present application belongs to the technical field of power supply device, and particularly relates to a wire clamp for a line, which comprises at least one set of supporting units, each set of supporting units comprises two triangular elastic connecting assemblies, the top corners of the two triangular elastic connecting assemblies are connected with a first winding rod, and the two bottom corners of the two triangular elastic connecting assemblies are respectively connected with a second winding rod, each set of supporting units can be independently connected in series on a wire in the line, or multiple sets of supporting units can be connected in series and share one second winding rod two by two in turn to form a set of supporting units arranged on the wire, and the wire can pass through one second winding rod of a single set of supporting units, and then pass through the first connecting rod and another second winding rod of the set of supporting units in turn. The device can make the wire in the line itself have the elastic function, so that more space is not needed for the line during construction, and the thermal expansion and contraction requirement of the wire can be met.

The invention discloses an integrated assembly of an anti-loosening strain clamp and a spring device for an electric power fitting, and belongs to the technical field of electric power fittings, and the integrated assembly comprises a mounting main body, a pressing plate is arranged on the inner side of the mounting main body, a fixing ring sleeves the outer wall, close to the pressing plate, of the mounting main body, and a fixing plate slidably sleeves the lower end of the outer wall, away from the pressing plate, of the fixing ring; fixing bolts are installed at the lower ends of the fixing rings in a threaded mode, a connecting block is fixedly installed at the lower end, away from the fixing plate, of the mounting body, a damping mechanism is fixedly connected to the end, away from the mounting body, of the connecting block, and a spring mechanism is rotationally installed at the side end, away from the fixing rings, of the mounting body; the locking ring is driven to rotate to enable the locking block to be close to the wire through bending generated when the tension of the wire fluctuates, the pre-tightening force on the wire is increased, the wire is straightened, the tension of the wire is reduced, and the wire is prevented from loosening and sliding out of the wire clamp due to too large tension.

To provide a tension balancer which can be used for a long period of time at a proper stroke length.SOLUTION: A tension balancer comprises first to n-th cylinder members, first to (n-1)th coil springs, a first hook attached to the first cylinder member, a second hook attached to the n-th cylinder member, and a scale attached to the n-th cylinder member. The scale extends in a first direction parallel with center axes of the first to n-th cylinder members, is located outside the n-th cylinder member, overlapped on n-th cylinder member in a second direction which is vertical to the first direction, and is able to be telescopic in the first direction. The first to n-th cylinder members are arranged so that a j-th cylinder member selected from the first to n-th cylinder members is surrounded by a (j+1)th cylinder member. The cylinder members and the coil springs are alternately arranged. The n is a natural number equal to or larger than 3, and the j is a variable which is selected from a natural number which is equal to or larger than 1, and equal to or smaller than (n-1).SELECTED DRAWING: Figure 1

The invention discloses a cable clamping device for thermal power plant equipment installation, and relates to the technical field of thermal power plants, the cable clamping device comprises an installation seat assembly and a pressing cover assembly which are distributed side by side up and down, and the pressing cover assembly is located above the installation seat assembly. The first clamping assembly and the second clamping assembly are located in the installation base assembly and the pressing cover assembly side by side, distributed side by side in the left-right direction and used for clamping a cable. The allowance assembly is located between the first clamping assembly and the second clamping assembly, the cable sequentially penetrates through the first clamping assembly, the allowance assembly and the second clamping assembly, and the allowance assembly is used for winding the cable while fixing the pressing cover assembly and providing allowance needed when the cable swings. When the cable is pulled by non-parallel force, the cable is stressed to synchronously drive the first clamping assembly and the second clamping assembly to rotate, and abrasion of the clamping position of the cable and the first clamping assembly is avoided.

The utility model relates to the technical field of strain clamps, and discloses a strain clamp which comprises two connecting shells and a fixing clamp, the left and right sides of the two connecting shells are fixedly connected with clamping shells, the adjacent sides of the multiple clamping shells are provided with limiting grooves, the left and right ends of the outer wall of the fixing clamp are fixedly connected with limiting columns, and the limiting columns are fixedly connected with the clamping shells. And the outer walls of the two limiting columns are slidably connected with the corresponding limiting grooves correspondingly, locking plates are rotationally connected to the front side and the rear side of the bottom connecting shell correspondingly, locking grooves are formed in the front side and the rear side of the top connecting shell correspondingly, and the tops of the two locking plates are clamped with the corresponding locking grooves correspondingly. According to the utility model, through rotation of the bolt, locking of the locking plate and the top connecting shell can be released, then the locking plate is turned over, the two connecting shells can be unlocked, meanwhile, the clamping shell is separated synchronously, replacement of the fixing clamp of the strain clamp can be completed, and the problem that the service life of the integrally designed strain clamp is shortened is avoided.

Clamps disclosed herein can help to effectively secure a cable to a support structure. The clamps advantageously use a polymer composite material to improve durability and performance. An example clamp includes a body, a keeper coupled to the body, and a securing member coupled to the body, where at least one of the body or the keeper include the polymer composite material.

The invention discloses a cable fixing and stress dispersing device for power transmission and distribution, relates to the technical field of cable connection, aims to solve the technical problem that a cable joint is easy to damage, and comprises a fixed rack, a swinging mechanism, a hanging seat, two clamping assemblies, a roller, a supporting arm and an arc sliding arm. Downward pressure is generated on the two supporting arms through the self-weight effect of the two ends of the cable, the initial supporting force of the spring is overcome, the supporting arms are pushed to move along the surface of the rolling wheel, the arc sliding arm slides downwards along the arc sliding groove, and under the elastic acting force of the spring, the two cable fixing cavities are matched with sags at the two ends of the cable correspondingly; the clamping assembly is used for clamping the arc sliding arm and locking the supporting angle of the supporting arm, cable supporting loosening is avoided, cable self-adaptive attaching fixed supporting is achieved, the contact area of the cable connecting position is increased, stress damage to the cable connecting position is reduced, and the technical problem that the cable connecting position is prone to damage is solved.

The application discloses a composite cable connecting assembly, a strain-type fitting and a mounting method, and belongs to the technical field of composite material products. The composite cable connecting assembly comprises a composite cable core, the composite cable core comprises a composite core rod and aluminum strands covering the composite core rod, a part of the composite core rod is exposed outside the aluminum strands, and the composite cable connecting assembly further comprises at least one tapered portion fixed to the composite core rod exposed outside the aluminum strands, wherein the tapered portion is integrally wrapped and solidified by the same material as the composite core rod, and an accessory is fixed to the composite core rod through fastening cooperation with an outer tapered surface of the tapered portion. The composite cable connecting assembly, the strain-type fitting and the mounting method have better fatigue resistance, high connection stability, light overall weight and the advantage of convenient construction.

The utility model relates to a fine adjustment type strain clamp for an electric power optical cable and a hoisting structure, which comprise an adjustable suspension device, and two ends of the adjustable suspension device are respectively connected with a U-shaped suspension ring and a heart-shaped ring. The adjustable suspension device comprises an adjusting frame and a fixing pin shaft, the two sides of the adjusting frame are in threaded connection with a first adjusting suspension rod and a second adjusting suspension rod, a first sliding ring and a second sliding ring are slidably arranged in the middle of the adjusting frame, the outer ends of the first adjusting suspension rod and the second adjusting suspension rod are of suspension ring structures, and screw pin holes are formed in the first adjusting suspension rod and the second adjusting suspension rod. The first slip ring and the second slip ring are provided with slip ring pin holes; the first adjusting suspender and the second adjusting suspender are opposite in thread turning direction. According to the utility model, the surface of the power optical cable is sequentially wrapped with the tension-resistant inner-layer twisted wire, the tension-resistant middle-layer twisted wire and the tension-resistant outer-layer twisted wire, the tension-resistant middle-layer twisted wire and the tension-resistant outer-layer twisted wire are respectively connected with the heart-shaped ring, and the U-shaped hanging ring is connected with the iron tower.