5391 results about "Pull force" patented technology

The invention relates to the field of wafer processing, and discloses a wafer grinding and polishing adjustment control system based on a tension sensor, which comprises a processing pressure acquisition module for acquiring the gravity of a heavy object, acquiring the tension of an electric cylinder in real time based on the tension sensor, calculating the processing pressure through a formula, and acquiring grinding state parameters of a wafer in real time; the processing pressure stability analysis module comprises a first analysis unit and a second analysis unit; the first analysis unit is used for calculating the accumulated variable quantity of the processing pressure in a preset monitoring period, comparing the accumulated variable quantity with a change threshold value and sending out an alarm signal; the second analysis unit inputs the grinding state parameters into a grinding state model to analyze a grinding state value, and reversely evaluates the state of the grinding disc; the adjusting control module adjusts the pulling force of the electric cylinder based on the first analysis unit and judges whether the grinding disc is replaced based on the second analysis unit. Accurate monitoring and stability control of the machining pressure are achieved, the state of the grinding disc can be effectively evaluated, and the wafer grinding and polishing quality and efficiency are improved.

The invention discloses a state transition pump shaft simulation load run-out detection system which comprises a pump, a dial indicator and a pull and push dynamometer. The pump shaft is provided with a driving disc and a stress disc, and the driving disc, the pump shaft and the stress disc are located on the same central axis. The dial indicator can be selectively configured in a radial run-out detection state by adjusting the position of the dial indicator and the direction of a measuring head, wherein the measuring head is perpendicular to the central axis and abuts against the outer circumferential surface of the pump shaft; in the axial run-out detection state, the measuring head is overlapped or parallel to the central axis and abuts against the axial end face of the pump shaft; the push-pull dynamometer can be selectively configured in a radial force application state by adjusting the position of the push-pull dynamometer and the direction of a force application end, wherein the force application end is perpendicular to the central axis and abuts against the outer circumferential surface of the stress disc, and a radial simulation load is applied; in the axial force application state, the force application end is parallel to the central axis and abuts against the disc end face of the stress disc, and an axial simulation load is applied. Through the state conversion of the same detection and force application device, the radial and axial runout integrated detection of the pump shaft under the simulated load is realized.

The present invention relates to the field of construction machinery, and in particular to a tensioning force control device for prestressed sleepers. The present invention solves the problems of a large prestress deviation and low tensioning positioning efficiency during tensioning of prestressed steel wires. The device comprises a tensioning module, a tensioning rod and a locking module. The tensioning module comprises a tensioning jack and a tensioning rod connector. The tensioning jack comprises a plurality of cylinder bodies provided with piston rods. Oil injection cavities of the plurality of cylinder bodies are communicated and oil return cavities thereof are also communicated. The piston rods are connected to the tensioning rod connector. The tensioning rod connector is temporarily connected to the tensioning rod when in use. The outer wall of the tensioning rod is provided with a nut gear in threaded fit with the tensioning rod. The tensioning rod is provided with a tensioning stepped hole. The locking module comprises a locking motor and a locking gear that is engaged with the nut gear when in use. The locking motor is connected to the locking gear. Each piston rod is used for tensioning one prestressed steel wire, and synchronized oil intake and return for the plurality of piston rods are achieved, alleviating the overlarge prestress deviation between the prestressed steel wires. The locking module allows for time-saving and labor-saving tensioning positioning.

The invention discloses an open caisson construction deviation rectifying device and relates to the technical field of open caisson construction deviation rectifying, the deviation rectifying device is used for rectifying an inclined well wall, the deviation rectifying device comprises a supporting frame, a connecting module, a driving motor, a rope collecting module, a lifting module, a gripper, a mooring rope and a ground anchor, the supporting frame is fixed to the ground, and the top end of the supporting frame is fixedly connected with the connecting module; the connecting module is fixedly connected with the rope collecting module and slidably connected with the lifting module, the driving motor is fixedly connected with the connecting module and fixedly connected with the rope collecting module, the lifting module applies downward pressure to the highest point, the rope collecting module pulls a gripper to apply downward pulling force to the two ends of the highest point, and well wall deformation caused by stress concentration during deviation rectification is prevented. The ground anchor can change the direction of the mooring rope position adjusting force, pressure can be accurately applied, secondary deviation of the open caisson caused by too large pressure is prevented, force can be applied from multiple directions to enable the open caisson to be evenly stressed during deviation rectification, and the deviation rectification stability is improved.

The invention relates to the technical field of grease detection, discloses a method for detecting the height of grease in an oil tank and sampling, and aims to solve the problems of high labor intensity and low operation efficiency and accuracy in the conventional method for detecting the height of grease in the oil tank. Controlling the gear motor to drive the reel to rotate, so that the plumb bob descends from the initial position at a constant speed, and acquiring a pressure value detected by the tension sensor in real time when the plumb bob descends; according to the pressure value, the starting moment when a plumb bob makes contact with the liquid level and the ending moment when the plumb bob makes contact with the tank bottom are determined, the descending length of the lifting rope between the starting moment and the ending moment is determined, and the descending length is the height of grease in the oil tank. According to the invention, the labor intensity of grease height detection and sampling is reduced, and the working efficiency and accuracy are improved.

The utility model belongs to the technical field of mechanical transmission, and particularly relates to an electric cylinder with a built-in force sensor, which comprises a lead screw assembly, a force sensor assembly and a force sensor assembly, the lead screw assembly comprises a nut and a screw rod, and the nut is movably sleeved on the outer side of the screw rod; the piston rod is fixedly connected with the nut; the bearing seat is arranged on the screw rod in a sleeving mode, the front end and the rear end of the bearing seat in the axial direction are connected with first bearings correspondingly, and the first bearings are connected with the screw rod; and the force sensor is arranged on the screw rod in a sleeving manner, and the force sensor is connected with the bearing seat. The axial tension and the axial pressure from the screw rod are transmitted to the bearing seat through the two first bearings respectively, and then the tension and the pressure are transmitted to the force sensor through the bearing seat respectively, so that output of pressure signals and pressure signals is realized.

The invention relates to a hand-held pulling and compression device for driving inter-changeable pulling and pressing tools, with a drive unit having a battery-operated electric motor and a scew drive with a threaded spindle connected to the electric motor and mounted rotatably on a housing body and a threaded nut mounted rotatably on the threaded spindle and non-rotatably on the housing body via a bearing unit. In order to provide a hand-held pulling and compression device which is suitable for driving inter-changeable pulling and pressing tools, it is provided that the hand-held pulling and compression device has a coupling unit which is connected to a tool holder and is connected to the threaded nut in such a way that pulling and compressive forces resulting from the direction of rotation of the threaded spindle are transmitted to the coupling unit.

The invention provides an axial anti-pulling water-blocking cable, and relates to the technical field of water-blocking cables, a cable core is spirally twisted on a central anti-pulling bearing unit, the central anti-pulling bearing unit is used for bearing main pulling force, and due to the winding mode of the cable core, when the cable core is subjected to pulling force, the cable core can be prevented from being damaged. The cable core can extrude the central tensile bearing unit towards the center so as to obtain a certain extension buffer space, so that the conductor is prevented from being broken, and the liquid foaming agent capsule in the central tensile bearing unit is extruded and broken by utilizing an extrusion force exceeding a limited value; therefore, the first foaming agent in the cable penetrates through the woven central tensile bearing unit to be combined with the second foaming agent in the twisting gap of the cable core, a large amount of foam colloid is generated, a high-stress area, where water leakage possibly occurs, of the cable is pressurized and subjected to leaking stoppage, and active response to water blocking according to local stress sudden change is achieved. Compared with a traditional passive water blocking technology, the response speed is higher, and the water blocking effect is better.

The utility model relates to a foldable propeller and a cross-medium aircraft with the same, the foldable propeller comprises a propeller hub controlled to rotate, a limiting structure arranged at the end part of the propeller hub and a plurality of blades uniformly arranged around the axis of the propeller hub, and each blade is hinged with the propeller hub; the hinged axis between the paddle and the propeller hub is perpendicular to the rotating axis of the propeller hub, and the limiting structure is located at the front end of the propeller hub in the direction of the pulling force generated when the paddle rotates along with the propeller hub; when the propeller hub rotates, the blades hinged to the propeller hub rotate and unfold under the action of centrifugal force to abut against the limiting structure. When the propeller hub stops rotating, the blades hinged to the propeller hub are folded to be close to the rotating axis of the propeller hub due to self weight or fluid resistance in the underwater flight process. The propellers are configured to be of a foldable structural form, so that the propellers are not prone to being impacted by water flow and damaged, meanwhile, turbulent flow generated when the water flow passes through the propellers is reduced, and the speed and stability of the cross-medium aircraft in the underwater flight process are improved.

A strength training machine includes a bracket and a pulling assembly. The pulling assembly includes a handle assembly and a counterweight device, an end of the bracket is formed with a cavity structure, and the counterweight device is arranged in the cavity structure, where the counterweight device includes a resistance adjusting assembly and a drive wheel, the handle assembly includes a pulling piece, a first end of the pulling piece is used to apply a pulling force, and a second end of the pulling piece is attached to the drive wheel, and the drive wheel rotates under the driving of the resistance adjusting assembly, so that the pulling piece is coiled on a wheel surface of the drive wheel while generating a counterweight pulling force, where a sliding assembly is arranged at one of a bottom or a side of the cavity structure.

The invention discloses a cascaded auto-disturbance rejection rotating speed stability control method with a quasi-resonance link based on propeller load, and the method comprises the following steps: S1, building a speed ring mathematical equation containing disturbance according to the basic structure and working principle of a surface-mounted permanent magnet synchronous motor; s2, according to aerodynamic characteristics of the propeller, establishing a mathematical model of tension and load torque of the propeller; s3, establishing a quasi-resonance cascade active-disturbance-rejection speed controller containing disturbance compensation according to the S1 and the S2, and performing stability analysis on a cascade expansion observer equation according to a Lyapunov stability theorem; and S4, a cascade active disturbance rejection control method with a quasi-resonance link is used to realize suppression of periodic and non-periodic disturbance of the rotating speed so as to realize high-performance speed control. According to the method, the motor and the propeller are integrally modeled, the influence of periodic disturbance and non-periodic disturbance on the rotating speed is considered at the same time, and the method has better dynamic performance and steady-state performance.

The invention relates to the technical field of part machining and positioning, in particular to a positioning device for part machining and a using method.The positioning device comprises a mounting rail, a primary clamping mechanism, a non-planar clamping mechanism, a shape follow-up mechanism, an axis keeping mechanism and a clamping, locking and pressurizing mechanism; the outer wall of the main gear is engaged with a displacement rack, and a fixed seat and a sliding seat are arranged above the mounting rail. Primary axis positioning is conducted on the shaft part through the primary clamping mechanism, then when one end of the machined shaft part is in a special shape, the shape follow-up mechanisms are attached to the special-shaped end face, and then any shape follow-up mechanism can trigger the axis maintaining mechanism to lock the position of each shape follow-up column at the moment; the shape follow-up mechanism is suitable for special-shaped faces of any shapes, and the shape follow-up mechanism can be matched with the clamping, locking and pressurizing mechanism to enable the non-planar clamping mechanism to pull force downwards and inwards, so that clamping of the clamping rubber on the outer walls of the special-shaped shaft parts is enhanced.

The invention relates to the technical field of machine tool cross beams, in particular to a numerical control gantry machine tool cross beam anti-deformation device which comprises a cross beam, two symmetrically-distributed top connecting pieces are rotationally installed at the top of an inner cavity of the cross beam, and two symmetrically-distributed bottom connecting pieces are rotationally installed at the bottom of the inner cavity of the cross beam. The distance between the two bottom connecting pieces is smaller than that between the two top connecting pieces, tensioning assemblies with adjustable tightness are installed between the bottom connecting pieces and the adjacent top connecting pieces, the two top connecting pieces are located at the two ends of the cross beam, and the two bottom connecting pieces are located in the middle of the cross beam. According to the invention, through the top connecting piece, the bottom connecting piece and the tensioning assembly, an obliquely upward pulling force is applied to the cross beam, the pulling force is decomposed into a vertically upward force and a horizontal force, and the vertical force can offset the gravity of the middle part of the cross beam, so that the downward bending deformation of the cross beam is reduced, and the purpose of reversible deformation is achieved.

The invention relates to the technical field of tire stacking, in particular to a stacking device for tire production. Comprising a conveying base; the fixing plate is fixedly connected to the conveying base; the first motor is fixedly connected to the fixing plate, and an output shaft of the first motor is provided with a straight gear; the sliding plate is connected to the fixed plate in a limiting and sliding mode, the sliding plate is fixedly connected with a rack frame, and the rack frame is meshed with the straight gear; the two clamping plates are connected to the sliding plate in a limiting and sliding manner; the baffle shaft is connected to the sliding plate in a sliding mode, and the two clamping plates are both connected with the baffle shaft in a sliding mode. According to the tire stacking device, when tire stacking is clamped, pulling force is applied to the force reducing shafts, stress concentration at the connecting position of the external fixing plate and the sliding plate and the connecting position of the clamping plates and the sliding plate is counteracted, the situation that the sliding plate and the two clamping plates are stuck due to deformation caused by long-time stress concentration is avoided, and therefore it is guaranteed that the tire stacking speed is stable.

The invention relates to the technical field of bridge construction, and discloses a bridge prestress tensioning device which comprises a prefabricated box girder, a plurality of tensioning assemblies are arranged on the prefabricated box girder, and the tensioning assemblies are used for applying tensioning force to the prefabricated box girder. The tensioning assembly comprises a corrugated pipe, a fixing clamping block, a first limiting block, a conical clamping sleeve clamping piece, a steel strand, a protective outer cover, a hydraulic driving assembly, a spiral fixing strip, a grouting hole, a second limiting block and a protruding block, and the spiral fixing strip arranged on the conical clamping sleeve clamping piece is in a spiral shape matched with the twisting direction of the steel strand; in this way, when the hydraulic driving assembly abuts against the second limiting block, the conical clamping sleeve clamping piece can exert certain twisting acting force on the steel strand, and therefore the fixing stability of the steel strand is enhanced, and the situation that in a traditional mode, when a clamping piece sleeve with the smooth inner wall is used for fixing, the clamping piece sleeve cannot be fixed easily is avoided. And the problem that the steel strand is difficult to fix stably for a long time due to single clamping force is solved.

The invention provides a rotary table bearing-torque motor thermal vibration coupling modeling method, and relates to the technical field of machine tool reliability analysis. Comprising the steps of calculating bearing restoring force, torque and elastic rigidity; giving a dynamic balance equation of the main shaft system; unbalanced magnetic pulling force and unbalanced mass excitation are calculated; a displacement field is solved, and load changes caused by the displacement field are transmitted to the thermal model; the contact force borne by the bearing is updated by considering the load effect related to displacement, and the friction heat generation of the bearing and the heat generation of each part of the motor are calculated; calculating thermal deformation and thermal displacement of the bearing; thermal resistance among nodes is calculated, and a temperature field equilibrium equation is given through a thermal resistance network to achieve rapid thermal-mechanical coupling analysis; the thermal equilibrium equation is solved to calculate temperature response; importing the latest temperature into the kinetic model; lubricating grease viscosity and bearing thermal deformation are updated; and repeating the steps to finally obtain the main shaft displacement field and temperature field response. The method is high in accuracy, high in universality, low in test cost and high in test efficiency.

The invention provides a system and method for testing the shear resistance of an anchoring structural plane under water-force coupling, and the system comprises a prestress loading device which provides a prestress for an anchoring body sample, so that the structural plane is provided with a water flow channel with controllable opening degree; the shearing device is used for applying shearing force to the anchoring body sample to enable the structural surface to slide so as to damage the mortar protective layer; the high-pressure corrosion device is used for providing an osmotic pressure environment for the anchoring body sample so that a corrosion solution permeates into the structural surface to corrode the anchor cable, and the data acquisition device is used for monitoring sliding displacement, shearing force, pulling force, water pressure and ion concentration of the structural surface; the anchor cable corrosion damage coefficient calculation device is used for obtaining an anchor cable corrosion damage coefficient in the anchoring structure surface; the residual shear strength calculating device is used for obtaining the residual shear strength of the anchored structural surface after corrosion; and the anchoring body safety evaluation device is used for evaluating the safety state of the anchoring body. The method solves the problem of testing the residual shear strength of the anchoring structural surface considering the corrosion damage of the anchor cable under the synergistic effect of multiple factors.

The invention relates to the technical field of insertion and extraction force testing, and discloses a detection device and method for automobile exterior trimming part assembling, and the device comprises a bottom frame, a tension testing assembly, a vibration mechanism, and an extrusion mechanism, the vibration mechanism comprises a gear-missing column, a moving plate, a first electric push rod, a placing plate, and a vibration spring, and the bottom frame is provided with a sliding groove. The moving plate is slidably connected into the sliding groove, the first electric push rod is fixedly installed in the sliding groove, the output end of the first electric push rod is fixedly connected with the side wall of one end of the moving plate, one end of the vibration spring is fixedly connected to the bottom frame, the placing plate is fixedly connected to the other end of the vibration spring, and a mounting block is arranged on the bottom frame. According to the device, the vibration mechanism and the extrusion mechanism are matched, so that the bumper support on the placement plate continuously shakes, various road surface vibrations borne by an automobile in the driving process are simulated, and the reliability of the buckle under long-term vibration is accurately evaluated.

The invention relates to the technical field of spiral drill rod production, and discloses welding equipment for a low guide vane spiral drill rod, which comprises a welding machine tool for the spiral drill rod, a spindle box is arranged on the welding machine tool for the spiral drill rod, a tailstock is arranged on the welding machine tool for the spiral drill rod, and chucks are arranged on the spindle box and the tailstock. The spiral blade can be screwed to be loosened and locked on the drill rod under the reverse control of the two adjusting motors, so that the tightness of the spiral blade on the drill rod can be effectively adjusted, the welding surface can be more tightly attached to the drill rod by adjusting the tightness of the spiral blade, the welding defects such as air holes and slag inclusion are reduced, and the welding quality of the drill rod is improved. Therefore, the welding strength is greatly improved, the improvement of the welding strength means the enhancement of the overall performance of the drill rod, in the drilling process, the drill rod with high welding strength can bear larger torque and tension, the downtime caused by breakage or falling of the drill rod is shortened, and the drilling efficiency is improved.

The present invention relates to the field of crane equipment, and in particular to a sway reduction and stabilization device for a crane hoist. In view of the problem in the prior art that a steel wire rope will inevitably shake during the speed regulation of a trolley, a sway reduction and stabilization device for a crane hoist is provided. Two first auxiliary ropes that are cross-arranged with each other are respectively arranged on the front and rear sides between a stabilization plate and a mounting plate. The lower ends of the first auxiliary ropes are respectively fixedly connected to fixed plates. When the crane trolley drives the hoist to move, the fixed plates are pulled mutually by the first auxiliary ropes that are cross-arranged with each other. Under the action of a two-way ratchet self-locking structure, while ensuring that the first auxiliary rope can be retracted and released by a first winding wheel, the pulling force from the first auxiliary rope cannot drive the first winding wheel to rotate, so that the first auxiliary rope can effectively maintain traction, reduce the shaking of the hoist during movement, and enhance the stability of the hoist during movement.

The utility model belongs to the technical field of anti-corrosion steel pipes, and particularly relates to an adhesive force testing frame for an anti-corrosion layer of a three-PE (Poly Ethylene) anti-corrosion steel pipe. The device comprises a support; the force application mechanism is arranged at the top end of the support, the force application mechanism comprises a pull rope, and the pull rope penetrates through the top end of the support and extends into the lower portion of the support; one end of the dynamometer is connected with the pull rope; and the clamp is connected with the other end of the dynamometer and is used for clamping the anti-corrosion layer. The tensile test device is used for solving the technical problems that in the prior art, the tensile test can be completed only by sampling the anti-corrosion steel pipe and feeding the sample into a test room, and the tensile test cannot be directly performed on the anti-corrosion steel pipe in the production and sales processes.

The invention relates to the technical field of welding equipment, in particular to an adjusting device for steel structure welding. Comprising a base, a clamp is installed on the base, the device further comprises a measuring mechanism, the measuring mechanism comprises a U-shaped plate, the clamp is installed on the top face of the U-shaped plate, the U-shaped plate is arranged on the upper side of the base, a swing frame is hinged to the front side of the U-shaped plate, a first torsion spring is arranged between the swing frame and the U-shaped plate, a rectangular plate is fixedly connected to the top of the swing frame, and a universal shaft is fixedly connected to one side of the rectangular plate. According to the invention, through the design of the measuring mechanism, in the process of placing the I-shaped steel, the inclined surface of the I-shaped steel is contacted with and extrudes the rear side surface of the contact plate, so that the contact plate can rotate by taking the joint of the universal shaft as the circle center, and tension or thrust is applied to the telescopic ends of the first telescopic rod and the second telescopic rod; therefore, the inclined plane of the I-shaped steel is measured, the angle of the I-shaped steel can be adjusted subsequently, and the I-shaped steel can be welded more conveniently.

The utility model discloses a tension hydraulic compensation adjusting mechanism based on strip steel coiling, and relates to the technical field of strip steel coiling. Comprising a mounting plate, three guide rollers arranged side by side are arranged at the upper end of the front face of the mounting plate, a linear empty groove is formed in the other side of the mounting plate, and an adjusting roller is arranged in the linear empty groove; the clamping assembly is located between the two front guide rollers; and the tension compensation assembly is arranged on the other side of the back surface of the mounting plate. A grating ruler is connected to a first protruding plate at one end of a movable plate, a hydraulic rod is arranged on the back face of a mounting plate, the hydraulic rod is matched with a second protruding plate through a pull block on an output shaft of the hydraulic rod to drive the movable plate to move downwards, an adjusting roller can be driven to move downwards when the tension of a spring is insufficient, and the tension of the adjusting roller is compensated; and the situation that the steel belt is loosened due to insufficient tension is avoided.

The invention provides a spring steel wire tension detection device capable of being quickly disassembled and assembled, which belongs to the technical field of steel wire detection and comprises a tensile machine, a buffer mechanism, a fixing mechanism, a locking mechanism and a triggering mechanism. The tensile machine comprises two clamps, and each clamp comprises a buffer mechanism arranged on the tensile machine and used for providing buffer force for a spring steel wire; the fixing mechanism is connected with the buffering mechanism, and the fixing mechanism is matched with the buffering mechanism to clamp and fix the spring steel wire; the locking mechanism is arranged on the buffering mechanism, and the fixing mechanism is limited and locked by the locking mechanism; and the triggering mechanism is arranged on the buffering mechanism, and the buffering mechanism triggers the triggering mechanism to move so as to relieve limiting of the locking mechanism to the fixing mechanism. According to the device, limiting can be automatically relieved after the spring steel wire is broken, an operator does not need to manually conduct complex unlocking operation, the spring steel wire can be rapidly pulled away, rapid dismounting of the spring steel wire is achieved, and the working efficiency is remarkably improved.

The invention relates to the technical field of welding, in particular to a welding method. According to the method provided by the invention, when the length of the wire harness is less than or equal to 500mm and the second end and the second terminal of the wire harness are welded, the first end of the wire harness is slightly influenced by vibration, and the tension value of the first terminal at the first end and the wire harness is reduced, so that after the welding parameters are adjusted, on one hand, the welding tension effect of the second end is reduced; on the other hand, vibration generated during welding is reduced, so that damage to the welding position of the first end is reduced, and tension values of the front end and the rear end can be balanced. In addition, the first end of the wire harness welded with the first terminal is clamped in the welding process, so that vibration generated when the second end of the wire harness is welded is counteracted by the clamping mechanism, propagation of the vibration to the first end is greatly reduced, and the influence on the first end is reduced.

Typically, for new swim students, the most critical prerequisite towards swimming is overcoming the fear of sinking when starting to learn how to swim, by gaining selfconfidence, reducing fear, relaxing their bodies, and getting buoyant on water. Accordingly, a swim and water activity training and assistance apparatus, comprising: an anchoring device configured to support a pulling force exerted by a player in a swimming pool, the anchoring device having a proximal end, and a base affixed to an anchorage neighboring to the swimming pool; a pulling device having a first end affixed to the proximal end of the anchoring device, a second end, and at least a rescue point between the first end and the second end inclusive configured to support a grasping and the pulling force exerted by the player while in the swimming pool is disclosed.

The utility model discloses a crane lifting rope limiting device in the technical field of crane lifting hooks, which comprises an anti-falling mechanism, the anti-falling mechanism comprises a hook, the hook comprises a connecting end and a hook body, the tail end of the hook body is fixedly connected with the lower end of the connecting end, an assembly groove is formed in the hook in a penetrating manner, a winding disc is rotatably arranged in the assembly groove, and the winding disc is fixedly connected with the hook body. A rotating shaft is movably inserted into the winding disc, the two ends of the rotating shaft are sleeved with anti-disengaging pieces, the head end of the hook body is fixedly connected with a limiting block, and the ends, away from the rotating shaft, of the anti-disengaging pieces abut against the limiting block. The limiting mechanism comprises a torsional spring arranged on the winding disc in a sleeving manner; during use, when the torsion spring drives the winding disc and the anti-disengaging piece to deflect upwards, a steel cable is unwound, at the moment, the limiting piece loses tension, meanwhile, the limiting piece is pushed to move upwards through the first spring, at the moment, the lifting rope is conveniently limited through the limiting piece, the possibility that the lifting rope continuously shakes in the hook body is reduced, and the lifting rope is more convenient to limit.

The invention discloses a jumper string capable of preventing a lead tension string from inclining, relates to the technical field of jumper strings, and aims to solve the problems that due to the blowing of wind power, leads swing and tend to drive the tension string to incline, and after the tension string inclines, the distance between the leads on two sides is increased, so that a jumper is separated from the leads, and the circulation of a conductive path is influenced. Through cooperation of an outer groove ring and an inner convex ring, before fixation, a clamping block can rotate between a clamping frame and a sliding plate and can be adjusted according to the angles of wires on the two sides of a tower, after fixation, the outer groove ring and the inner convex ring are tightly attached, an annular protrusion of the inner convex ring is clamped into an annular groove of the outer groove ring, and the contact area between the outer groove ring and the inner convex ring is increased; when a wire swings to drive a tension string of a tower to incline, a pulling force is transmitted to the clamping block through the tension wire clamp, so that the clamping block is limited by the outer groove ring and the inner convex ring, and the situation that the jumper wire and the wire are disconnected due to inclination of the tension string after the jumper wire is connected, a conductive path is disconnected, and power transmission is affected is prevented.

The invention discloses a bolt guarantee load testing method based on ultrasonic waves, which comprises the following steps: pasting a ceramic patch on the head of a bolt, and measuring the length change of the bolt before and after loading by using the ultrasonic waves to judge whether the bolt meets the guarantee load requirement, and comprises the following steps: firstly, measuring the initial length L0 of the bolt; a guarantee load is applied according to the GB / T3098.1 standard and kept for 15 seconds, the length L1 of the bolt is measured again after unloading, and if the difference value of L1 and L0 is within the range of + / -5 microns, the bolt is judged to be qualified; otherwise, increasing 3% of the load for retesting; according to the method, the contact error of traditional mechanical measurement is avoided, the measurement precision is improved, and a more accurate and convenient technical means is provided for quality control of high-requirement fasteners.