38results about How to "Solve loose" patented technology

The utility model relates to fish ball machine shell (20) technical field, especially a cutting knife plate clamping device. The utility model discloses a frame, a pair of respectively along the frame front -back direction interval arrangement rotation setting and respectively along the frame upper -down vertical direction set in the frame top of one pair of material distribution sleeve, the blade clamp plate of screw mounting in the frame below, a pair of cutting blade that are closely arranged along the frame upper -down height direction are located in the blade clamp plate and along the frame left -right direction sliding arrangement, a pair of respectively with each material distribution sleeve one -to -one and the blanking hole of penetrating frame and blade clamp plate, two groups with each blade clamp plate one -to -one and respectively set up in the left and right sides of frame's mounting assembly and set up on fish ball machine shell (20) and be used for synchronous drive two cutting blades to the opposite direction activity's drive assembly. The device solves the problem that the fixed screw is easy to come off in the movable process of cutting knife plate.

This utility model provides a temple connection structure and eyeglasses, relating to the field of eyeglasses. It solves the problem that fixing the temples to the frame with screws is prone to loosening and wear, leading to a decrease in fixing force. The temple connection structure includes a receiving shaft, a plug-in shaft, and a rubber gasket. One of the temples and the frame has a single hinge plate fixed to it, while the other has a mating groove. The single hinge plate extends into the mating groove and has a first hole. The rubber gasket is located on one side or opposite sides of the single hinge plate, with a portion of the gasket extending into the first hole. The receiving shaft passes through the groove wall of the mating groove and the first hole. The plug-in shaft is inserted into the receiving shaft with an interference fit, thereby rotatably connecting the temples to the frame. The rubber gasket is clamped between the groove wall of the mating groove and the single hinge plate. The plug-in shaft, inserted into the receiving shaft with an interference fit, forms a solid whole, achieving a hinged connection between the temples and the frame. The rubber gasket provides smooth and uniform damping for opening and closing the temples.

The utility model belongs to the technical field of mechanical parts, and particularly relates to a two-wheeled vehicle adjusting nut with an anti-loosening function, which comprises a screw rod, a main nut and an anti-loosening nut, the main nut is in threaded connection with the screw rod, one end of the main nut is fixedly connected with a circular truncated cone-shaped extension cylinder, and the other end of the main nut is fixedly connected with the anti-loosening nut. The inner wall of the extension cylinder is provided with an internal thread connected with the main nut, and the outer wall of the extension cylinder is provided with an external thread along the curved surface. According to the two-wheeled vehicle adjusting nut with the anti-loosening function, after the main nut is screwed down, the anti-loosening nut is rotated to be in threaded connection with the outer wall of the extending cylinder, so that the main nut is subjected to force in the axial direction of the anti-loosening nut, and then the probability that the main nut is loosened due to vibration is reduced; a larger contact surface can be provided, the friction force between the threads on the outer wall of the periphery of the extension cylinder and the threads on the inner wall of the periphery of the locknut is improved, and therefore the stability of connection is improved.

The utility model discloses a kind of firm terminal plug, it includes terminal seat, front inner shell, front shell, tail shell, front lock cap, rear lock cap, tail rubber sleeve, upper half lock hoop, lower half lock hoop and locking screw, terminal seat is located in front inner shell, front shell is sleeved on front inner shell to form annular slot, for inserting corresponding component.Tail shell front end is connected with front inner shell through front lock cap, tail rubber sleeve front end is connected with tail shell tail end through rear lock cap, the connecting lug of rear lock cap both sides is connected with upper half lock hoop, lower half lock hoop by locking screw, to hold fixedly tail rubber sleeve, so that tail rubber sleeve contraction is closely connected with cable, avoid cable tension direct action in the connecting place of cable and terminal, effectively solve the problem that traditional terminal plug is without fixed structure due to shell and cable, lead to cable back and forth to pull and make connecting place loose or disengagement, greatly improve the working stability and reliability of terminal plug, reduce the risk of electrical signal or power interruption, and long service life.

The invention relates to the technical field of lamps, and provides a plant lamp and a control method thereof.The plant lamp comprises a lamp body assembly, a first connecting assembly and a second connecting assembly, and the first connecting assembly and the second connecting assembly are fixedly connected to the two ends of the lamp body assembly correspondingly; the first connecting assembly comprises a first joint, and the first joint is provided with a first electric connecting part and a first connecting part; the second connecting assembly comprises a second connector, and the second connector is correspondingly provided with a second electric connecting part and a second connecting part. According to the plant lamp, electric connection and mechanical fixed connection of the plant lamp are both arranged in the first connecting assembly and the second connecting assembly, when at least two plant lamps are connected, the adjacent plant lamps are electrically connected through the first electric connecting part and the second electric connecting part, and the first connecting part and the second connecting part are fixedly connected; the first connector of one plant lamp is connected with the second connector of the other plant lamp, so that electric connection and mechanical fixed connection of the plant lamp and the plant lamp can be completed, and the problems that an outer shell is loosened and internal electric connection is unreliable can be effectively solved.

The utility model provides a kind of high-pressure threaded connector, including cylindrical connector, its front end is equipped with threaded hole, bottom center has the through-hole of penetrating rear end, threaded hole bottom has coaxial inner tube, inner tube front end is slotted and is equipped with protruding positioning part.Outside wall is also included with outer thread connecting pipe, and threaded hole is threadedly connected, its inner wall is equipped with the positioning recess corresponding with positioning part, positioning part is embedded recess and realizes circumferential fixation when screwing.In addition, slotted and threaded hole bottom interval promotes sealing;Inner tube front end extends and facilitates fluid transition;Connector rear end has output pipe;Outside wall ridge helps hand-held operation;Positioning recess side wall chamfer facilitates assembly.The present application is suitable for various medical high-pressure pipeline connection, effectively improves connection reliability.

The utility model belongs to the field of noon break chairs, and provides an inclination adjusting mechanism for a chair back and a noon break chair, the inclination adjusting mechanism comprises a chair frame, the chair frame, the chair back and a chair back rotating shaft, the chair back rotating shaft is provided with a rotation assisting mechanism and a positioning mechanism, and the rotation assisting mechanism comprises auxiliary bolts which are respectively arranged on two sides of the end part of the chair back rotating shaft and can rotate; the auxiliary bolt and the chair back rotating shaft are arranged in parallel, a second supporting plate is arranged on the chair frame, and a guide hole for the auxiliary bolt to move is formed in the second supporting plate. By arranging the two auxiliary bolts and arranging the two auxiliary bolts on the two sides of the rotating shaft bolt respectively, three-point connection is formed between the chair back and the chair frame, so that the connection effect can be better improved, the connection stability is effectively improved, and the problem that in the prior art, due to the fact that only one rotating shaft is arranged between the chair back and the chair frame for supporting, the chair back and the chair frame cannot be supported is solved. The connection stability is poor, so that the connection of the chair back and the chair frame is loose as a whole.

The utility model relates to photovoltaic power generation equipment technical field, concretely is a kind of installation base of photovoltaic power generation equipment, including pedestal, the pedestal is evenly provided with a plurality of rotating grooves, structure bin is opened in the pedestal, structure bin is communicated with rotating groove, rotating groove is rotatably connected with fixed block, fixed hole is arranged on the fixed block, fixed bolt is arranged in the fixed hole, the installation base of this photovoltaic power generation equipment, by setting up fixed block, oil silk rope, fixed pulley and the linkage structure of lifting column, when photovoltaic board is resisted by wind resistance, wind force gives the upward force of photovoltaic board, drives lifting column to move upwards, to realize rotation by oil silk rope and pull fixed block, the bottom end of fixed bolt is inclined to outside, increase the friction of fixed bolt and ground, to effectively prevent photovoltaic power generation device from being swept away by wind and damaged, and simultaneously setting up adjusting component can solve the problem of lifting column loosening caused by oil silk rope stretching.

The utility model discloses a thread locking type industrial furnace roller, which comprises a central shaft, a first shaft bumper, a circular ring piece and a second shaft bumper, the first shaft bumper is fixed at the left end of the central shaft, the right end part of the central shaft is provided with an external thread, the right end part of the central shaft is provided with a locking nut, the locking nut is screwed on the external thread, and the second shaft bumper is fixed on the circular ring piece. The locking nut is in pressing contact with the second shaft bumper; in conclusion, a nut locking structure is adopted to replace a traditional clamping mode, so that the assembly efficiency and the maintenance convenience are remarkably improved; the problem that the nut is loosened in a high-temperature vibration environment is effectively solved through the cooperation of the cotter pin and the cotter nut, the design of the belleville spring set and various anti-loosening schemes. Meanwhile, the high-temperature-resistant and self-repairing characteristics of the fiber roller surface are reserved, and the influence of surface sintering oxidation on the product quality is avoided; the structure is easy and convenient to install, the overall reliability of the furnace roller is greatly improved, and the service life of the furnace roller is greatly prolonged.

The present application relates to the field of ore fluidization magnetization roasting, and particularly provides a dust leakage and gas backflow prevention hood for a suspension roasting furnace and a use method, the hood comprises a wind cover, a fixing plate and a core pipe; a gas cavity is formed in the wind cover, a plurality of wind cover air outlets are uniformly arranged on the wind cover in the circumferential direction of the wind cover body, and the gas cavity is in communication with the wind cover air outlets; the core pipe is arranged in the gas cavity of the wind cover, a core pipe gas channel coaxial with the core pipe is formed in the longitudinal direction of the core pipe, the core pipe gas channel is located in the gas cavity, one end of the core pipe gas channel is a core pipe air outlet, the core pipe air outlet is in communication with the gas cavity, the other end of the core pipe gas channel is a core pipe air inlet, and shunt pipes in communication with the core pipe gas channel are arranged on both sides of the core pipe gas channel; the shunt pipes are arranged in an inclined downward manner; the inclination directions of adjacent shunt pipes on the left and right sides are different, and the inclination directions of adjacent shunt pipes on the same side are the same; the hood for the suspension roasting furnace has good dust leakage and gas backflow prevention performance, and ensures stable, efficient and safe operation of the suspension magnetization roasting furnace.

The utility model relates to door and window technical field, concretely relates to a kind of card slot type heat insulation strip and its broken bridge aluminum profile, it includes first profile, second profile, third profile, fourth profile, upper heat insulation strip, lower heat insulation strip, soundproof cotton, sealing rubber strip and the like component.Heat insulation strip adopts card slot type design, main part is equipped with reinforcing rib, surface is coated with weatherable coating, and it is realized convenient replacement by modular structure;Sealing rubber strip is used in conjunction with soundproof cotton, and improves sealing performance and heat insulation effect.The application can significantly improve profile connection stability, enhance the replaceability of heat insulation strip, and optimize the sealing performance, suitable for building door and window field, with the advantages of high efficiency, stability and easy maintenance.

This utility model discloses an anti-loosening quick-installation and quick-disassembly locking device, belonging to the field of locking and installation technology. The utility model includes a lower base, sliding locking blocks, and an upper base. The lower base has three first slide rail positions and two second slide rail positions. Three sliding locking blocks are provided, with first and second sliders respectively located on both sides of the bottom end of each sliding locking block. Through optimization and upgrades, the design of the three sets of sliding locking blocks allows for smoother thread engagement and more stable function. It can be used for the installation of ordinary faucets as well as faucets with 2-4 hoses. The product can be pre-installed with hoses and tested for sealing before leaving the factory, eliminating the need to remove the hoses, improving product yield and reducing customer complaints. It achieves quick installation and disassembly, greatly reducing labor costs. The installed product effectively prevents loosening, solving the problem of loosening at its source. It is highly practical, low-cost, and suitable for widespread application.

The utility model belongs to the technical field of aerial cables, and particularly relates to a highly wear-resistant aerial cable, which comprises a conductor and an insulating layer, the insulating layer is arranged on the peripheral side of the conductor, a heat-insulating layer is arranged on the peripheral side of the insulating layer, a heat-resistant reinforcing layer is arranged on the peripheral side of the heat-insulating layer, a heat-resistant layer is arranged on the peripheral side of the heat-resistant reinforcing layer, and a flame-retardant layer is arranged on the peripheral side of the heat-resistant layer. A protective layer is arranged on the peripheral side of the flame-retardant layer, and a wear-resistant coating is arranged on the peripheral side of the protective layer. According to the utility model, the problems that when the cable is exposed in the sun for a long time, the material on the surface of the cable is possibly subjected to thermal aging and further cracks due to poor high temperature resistance of the cable are solved, and the problem that the cable is loosened or fractured due to structural damage caused by frictional wear in the long-term use process is solved.

This invention relates to the field of hay baling technology, specifically a livestock hay baling device. The invention includes a base, a support mechanism on the top surface of the base, a baling mechanism fixedly connected to the side of the support mechanism, a lifting assembly between the support mechanism and the base, and a circumferential pressing mechanism installed in the lifting assembly; a top pressing mechanism on the top surface of the support mechanism; a discharge conveying device and a feeding plate on the side of the support mechanism, an infeed conveying device on one side of the feeding plate, and an infeeding assembly on the top surface of the feeding plate that works in conjunction with the infeed conveying device; and a discharge assembly within the top pressing mechanism. This invention, through the circumferential and top pressing mechanisms, can compress the hay bales before baling, increasing the density of the hay bales and solving the problem of loosening during transportation and loading.

The utility model relates to embankment maintenance technical field discloses a kind of embankment maintenance devices for water conservancy management, including soil embankment, and soil embankment inside is evenly provided with positioning hole in four diagonal positions, and soil embankment upper end is paved with embankment slope protection net, and four positioning holes are all provided with inner support positioning unit for embankment slope protection net to be tightly laid on the upper surface of soil embankment, and inner support positioning unit includes positioning assembly, and the outer side annular arrangement of positioning assembly is provided with multiple expansion inner support mechanism for being attached with the inner wall of positioning hole, and the mutual cooperation between positioning assembly, synchronous assembly, transmission assembly, driving assembly and expansion inner support mechanism, effectively solve the problem that slope protection net is loose or deformed in traditional embankment maintenance, and positioning assembly is combined with expansion inner support mechanism by accurate positioning, ensure that embankment slope protection net always maintains tension state, and the cooperation of synchronous assembly and transmission assembly guarantees the accurate deployment and retraction of expansion inner support mechanism.

The utility model discloses a silk screen mounting structure in an adsorber, and relates to the technical field of adsorbers. The device comprises a mounting disc, a fixing disc and a turncap, the fixing disc is arranged at the top end of the mounting disc, mounting rods are fixed to the top end of the mounting disc in an annular array mode, the mounting rods penetrate through the fixing disc and extend out of the top end, the turncap is movably connected to the periphery of the mounting rods above the fixing disc, an inner cavity is formed in the turncap, and a mounting screw is fixed to the top in the inner cavity. And the mounting screw rod is in threaded connection in the mounting rod. According to the silk screen installation structure in the adsorber, the installation disc, the fixing disc and the turncap are arranged, so that the problems that the installation operation of the silk screen installation structure in the adsorber is troublesome, and the silk screen can be loosened after working for a long time are solved, and the silk screen installation structure in the adsorber has the advantages that the installation operation is simpler and more convenient; and the looseness of the mounting structure caused by vibration of the silk screen can be compensated by pressing.

The invention belongs to the technical field of petroleum yield increasing transformation, and particularly relates to a shale oil horizontal well high-pressure drainage system and method. The drainage and mining system comprises a wellhead casing gate valve, a drainage and mining device, a control system and a pressure transmitter, the drainage and mining device comprises a four-way joint, an oil nozzle valve and a parallel gate valve which are communicated in sequence, the four-way joint is communicated with the wellhead casing gate valve, and a production oil nozzle is installed in the oil nozzle valve. The pressure transmitter is installed to monitor the discharge and production pressure in real time, so that the production oil nozzle with the proper specification is adjusted and installed according to the wellhead pressure and the liquid amount. The production oil nozzle is mounted in the oil nozzle valve, so that sufficient mounting positions can be provided for the production oil nozzle, the production oil nozzle is mounted along the flow direction of production oil, and the oil nozzle can be firmer when subjected to impact and rotating force of the oil flow during normal production; the problems of loosening and tripping of oil nozzle threads caused by rotating force generated by high-pressure fluid are solved.

The utility model discloses an oblique folding wave anti-blocking counter flow type cooling tower packing sheet with bonding points, and belongs to the technical field of cooling tower packing. The cooling structure comprises a group of transverse flow channel cooling structures and oblique flow channel cooling structures, the transverse flow channel cooling structure comprises a set of first protrusions, a vertical first channel is formed between every two adjacent first protrusions, and a set of first retention areas are arranged in each first channel. The inclined flow channel cooling structure comprises a group of second bulges, an inclined second channel is formed between the adjacent second bulges, and a group of second retention areas are arranged in the second channel; the first channels and the second channels are in one-to-one correspondence and staggered arrangement, and inclined flow guide planes are arranged between the first channels and the second channels. Based on the alternate structural design of the transverse flow channels and the inclined flow channels, the transverse flow channels can provide a larger contact area, so that cooling water can be in full contact with the surface of the filler, and the heat and mass transfer efficiency is improved; the introduction of the inclined flow channel provides flow paths in different directions for the water flow, so that the water flow can be more uniformly and stably distributed in the whole filler.

This invention discloses an installation structure and its automotive alternator, including a housing, a hinge component, a first tensioning structure, and a connecting plate. The housing has an installation cavity, and a first buffer mechanism is installed on the inner wall of the installation cavity and connected to the hinge component. The end of the hinge component facing away from the first buffer mechanism is connected to the connecting plate. By connecting the motor body to the engine block through the installation structure, even if the crankshaft belt at the motor body output end becomes loose, continuous tension can be maintained based on the deformation of the belt. This invention's installation structure solves the problem of drastic fluctuations in engine crankshaft speed, which can easily lead to loosening of the crankshaft belt at the automotive alternator output end after long-term use. Compared to the tensioner pulley method of maintaining tension, this invention, through the setting of the first tensioning structure, can maintain continuous tension even after the belt deforms and loosens, thus possessing an adjustable and adaptable function.

The utility model discloses a power supply control mechanism with a quick-release waterproof function and an electric camping car, the power supply control mechanism comprises a shell assembly, and the shell assembly is respectively provided with a first accommodating cavity and at least one second accommodating cavity; the circuit board is fixedly arranged in the first accommodating cavity; the at least one battery assembly is detachably arranged in the corresponding second accommodating cavity and can be electrically connected with the circuit board; a male electric connecting sheet is fixedly arranged in the second accommodating cavity in a penetrating manner and is electrically connected with the circuit board; the battery assembly is provided with a female electric connection card, and the female electric connection card is detachably and electrically connected to the male electric connection sheet. According to the utility model, the female electric connection card is detachably and electrically connected with the male electric connection sheet, so that the problem that the electric connection position of the energy supply battery and the control panel of the existing electric camping car is loose is effectively solved.

The invention discloses a water supply and drainage pipeline with a quick assembly function, and relates to the technical field of water supply and drainage engineering. The combined pipeline specifically comprises a first combined pipeline body and a second combined pipeline body, and the first combined pipeline body and the second combined pipeline body are connected in an inserted fit mode. An automatic locking mechanism is arranged at the joint of the first combined pipeline and the second combined pipeline and comprises a clamping assembly and a pressure bearing assembly. When the first combined pipeline and the second combined pipeline are connected in an inserted mode, the pressure bearing assembly is pressed to relieve limitation on the clamping assembly, and therefore the clamping assembly is triggered to move to the locking position under the action of elastic bias. The invention further comprises a rotary fastening assembly which is configured to apply axial fastening force to the joint when the rotary fastening assembly is screwed in. The invention aims to solve the problems that existing pipeline assembly depends on a large number of accessories, the efficiency is low, and the sealing effect is poor due to looseness.

The utility model relates to wood tray processing technical field, concretely is a kind of transfer equipment for wood tray processing, including support plate, its top two sides symmetry fixed with two limit baffle, the top of support plate is provided with the clamping plate, and clamping plate is provided with tightening mechanism between two sides limit baffle;Hollow bottom shell, its fixed connection in the middle bottom of support plate, positioning mechanism is provided between the middle part of support plate and clamping plate.The utility model reaches the effect of limiting the lateral displacement of stacked wood tray by the cooperation of positioning rod and wood tray middle part crosspiece, solves the problem that wood tray is unstable in the process of stacking due to lateral deviation caused by inertia in the prior art.

The utility model relates to POS machine safety terminal related technical field, especially with double bottom shell anti -disassembly point POS machine safety terminal, including terminal upper cover, the lower extreme of terminal upper cover is provided with terminal lower cover, the lower extreme fixed mounting of terminal upper cover has the nut, the both ends of terminal lower cover all are fixedly installed and are penetrated to have first connecting rod, the front end fixed mounting of first connecting rod has first limit block, the front end of terminal lower cover is provided with limit slot, through with first limit block precision card into limit slot as benchmark, firmly lock the moving path of first connecting rod, avoid the transmission deviation of traditional structure because of no benchmark, again by first connecting rod synchronous drive second limit block directional push one of third limit blocks, make it separate from the tooth groove of first gear and realize one -sided unlocking, reserve another third limit block under the elastic pre -tightening effect always resist first gear, form only allow first gear unidirectional rotation, reverse be firmly locked mechanical logic.

The utility model discloses an improved floating plate upper -placed formula slab shear hinge, this shear hinge includes the embedded sleeve pipe in the floating plate, installs the stud in this embedded sleeve pipe, the upper surface of low side's floating plate places the height -adjusting base plate, and the height -adjusting base plate or the floating plate is provided with the buffer pad and the shear plate, and the shear plate, buffer pad, height -adjusting base plate realize the fixed through the double -layer single -cut groove self -locking nut and flat washer of stud top. Wherein, be provided with stiffened plate on shear plate, and through the optimization shear hinge stud's layout position solved the uneven problem of existing shear hinge stud stress. Through the optimization shear plate shape, reduced the thickness of shear plate, saved the use of material, embedded steel sleeve pipe bottom 2 layer bottom plate for increasing the pullout resistance of embedded steel sleeve pipe. The stud only sets up the screw thread in the lower part, is used for the axial force that the stud received is transmitted to the inside of floating plate, reduces the stress level of floating plate surface concrete to reduce or avoid the damage of the board body.

The application provides a screw anti-loosening structure for a fuel cell and a stack clamping device, which comprises a rotation-stopping block and a rotation-stopping spring, the rotation-stopping block is provided with a through hole, the rotation-stopping spring is arranged in the through hole; a threaded hole is arranged on a mounting body, the rotation-stopping block is threadedly connected with the threaded hole, one end of a screw rod is threadedly connected with the threaded hole through the through hole and the rotation-stopping spring; the rotation-stopping spring is a spiral structure, the screw rod is threadedly connected with the rotation-stopping spring; a limiting groove is arranged on the through hole, limiting columns are arranged at two ends of the rotation-stopping spring, and the limiting columns are located in the limiting groove; a nut on the screw rod abuts against the rotation-stopping block. The application solves the problem of loosening of a double-end screw rod during vibration, impact and large temperature change of a stack, reduces the dismounting difficulty of the anti-loosening structure, and improves the stability of the stack operation.

This invention discloses a phototherapy lamp for assisting depression treatment with high sunlight simulation, comprising a panel with multiple through-holes; lamp bodies are installed in each hole, and finned heat sinks are connected to the top of the lamp bodies; hanging rods are detachably connected to the four edges of the top surface of the panel, suspending the panel from the ceiling; a bottom frame is magnetically attached to the bottom surface of the panel; and the lamp bodies contain a full-spectrum LED light source with an increased wavelength of 475-485nm. The purpose of this invention is to provide a phototherapy lamp that better simulates natural light, reduces blue light components, and increases the 480nm wavelength band, which has the highest response efficiency for photosensitive optic nerve cells, effectively enhancing the auxiliary treatment of depression and improving its therapeutic effect. Simultaneously, it eliminates additional devices such as fans, making the overall structure more compact, reducing the size and weight of the lamp, and lowering the overall height and center of gravity. It is also more convenient for ceiling embedding.

The utility model discloses an assembly type tilt angle sensor for engineering machinery, and belongs to the technical field of engineering machinery. An assembly type tilt angle sensor for engineering machinery comprises a tilt angle sensor body, a mounting box and a mechanical arm, a mounting hole is formed in the mechanical arm, an avoiding groove is formed in the outer side of the mounting box, a U-shaped clamping plate is arranged in the avoiding groove, the U-shaped clamping plate is in sliding connection with the mounting box through a telescopic plate, a clamping groove is formed in the telescopic plate, and a lifting clamping block is arranged in the mounting box. And the lifting clamping block is matched with the clamping groove through driving of the screw rod, so that the U-shaped clamping plate is locked with the edge of the mounting hole. The screw drives the lifting clamping block to be wedged into the slope self-locking mechanism of the clamping groove to form continuous tensioning force, so that the U-shaped clamping plate is tightly abutted against the edge of the mounting hole of the mechanical arm, and the problem of nut loosening caused by vibration in traditional bolt connection is solved. The limiting block and the limiting groove restrain the lifting clamping block to only move linearly, and the flange of the cross-shaped groove head of the screw is matched with the annular groove to prevent axial movement.

The utility model discloses a zip pull together fatigue test device, include: frame, be provided with panel and a plurality of trigger, and panel can show the trigger number of times of triggering, be connected with the first clamping component of frame, including the first upper clamping piece and first lower clamping piece that clamped first chain cloth upside and downside respectively, be connected with the second clamping component of frame, including the second upper clamping piece and second lower clamping piece that clamped second chain cloth upside and downside respectively, second upper clamping piece and second lower clamping piece, pull head, can reciprocating motion in vertical direction on frame, to reciprocating close and open the chain tooth of first chain cloth and second chain cloth, first upper clamping piece, first lower clamping piece, second upper clamping piece and second lower clamping piece are all elastically installed in frame, and can reciprocating displacement when chain tooth and close and open, to reciprocating trigger trigger. Accurate simulation zip real pull together action, direct monitoring open and close times, adapt to different chain cloth, ensure that test data is accurate and reliable.