152 results about "Screw loosening" patented technology

The utility model discloses a double-diaphragm disc type brake chamber which comprises a front cover assembly, a middle body assembly and a cylinder body assembly. A push rod disc assembly is arranged between the front cover assembly and the middle body assembly, a first leather film is arranged between the push rod disc assembly and the middle body assembly, a dustproof sleeve is fixedly arranged on the front cover assembly and arranged on the outer side of the push rod disc assembly in a sleeving mode, and the cylinder body assembly comprises a second leather film, an aluminum release disc, a cylinder body and a release bolt. According to the double-diaphragm disc type brake chamber, due to the fact that the sealing assembly is arranged, hard friction between the tappet rod and the inner hole of the middle body is reduced, the service life of a product is prolonged, meanwhile, the tappet rod and the tappet rod disc are connected in a riveting pressing mode, the assembling technology is simplified, the assembling cost is reduced, and the potential risk that screws are loosened due to the fact that thread glue is not coated is avoided; center positioning of the release disc is increased through the parking cavity leather film, and damage to the release disc and the spring due to the fact that the leather film and the release disc are not positioned in the prior art when the parking cavity works is reduced.

The invention discloses a screw locking structure with a spring tip cone, which comprises a screw which penetrates through a first connected piece and then is in threaded connection with a second connected piece, the lower section of the screw is a locking section, the locking section is in threaded connection with the second connected piece, the locking section is provided with a first taper hole, and the spring tip cone is arranged in the first taper hole. A convex cone matched with the first conical hole is arranged in the threaded hole of the second connected piece, the smaller end of the convex cone faces the head of the screw, a spring is fixed to the larger end of the convex cone and connected with the second connected piece, gaps are formed in the hole wall of the first conical hole and distributed in the axial direction of the screw, and one end of each gap extends to the bottom of the screw. Compared with the prior art, the structure is simple, the convex cone is sleeved with the first conical hole and downwards extrudes the spring, the convex cone opens the locking section so as to increase radial pressure, and the external thread of the locking section tightly holds the internal thread of the second connected piece so as to achieve the anti-loosening effect; the spring can apply axial force to the screw through the convex cone to increase the pre-tightening force of the screw so as to achieve looseness prevention.

Proposed is a dental and medical mirror used at dentist clinics and hospitals. The mirror includes a mirror body part gripped by the hand during use, and a mirror holder part which is coupled to the mirror body part, and has a mirror provided at one end thereof and is replaced after use for a predetermined period, and employs elastic coupling instead of conventional screw-coupling as the form of coupling of the mirror body part and the mirror holder part, thereby enabling the mirror body part and the mirror holder part to be easily and firmly coupled to each other by a simple fitting operation, and fully solving the problem of screw loosening occurring during a procedure in which the mirror is used.

The invention provides a tool magazine protective door assembly and a machining center. The tool magazine protective door assembly comprises a base, a mounting support, a protective cover, an air cylinder, an air cylinder support, a screw and a pin, and a telescopic rod of the air cylinder drives the protective cover to open or close an inlet and outlet in the mounting support; the cylinder bracket is provided with a central hole, a first bracket fixing hole and a second bracket fixing hole; the Z-axis forward end of the telescopic rod penetrates through the center hole and extends out of the base to be connected with the protective cover. Screws penetrate through the first support fixing holes to be in threaded connection with the base, pins penetrate through the second support fixing holes to be fixedly connected with the base, and the pins are in interference fit or clearance fit with the second support fixing holes. The number of the pins is at least two, and one pin corresponds to one second support fixing hole. According to the tool magazine protective door assembly, the coaxiality of the telescopic rod of the air cylinder and the mounting hole can be guaranteed, rapid and accurate positioning can be guaranteed after a screw is loosened or manually disassembled and assembled, meanwhile, the air cylinder is arranged in the base, the needed mounting space is small, and the movement rigidity of the air cylinder is high.

The invention discloses a gasket for detecting looseness of screws and bolts of a rail operation vehicle and a manufacturing method, and particularly relates to the field of rail operation vehicles, the gasket comprises a gasket and a lower gasket, the upper gasket is arranged above the lower gasket, and the upper gasket and the lower gasket are meshed with each other; the center of the upper gasket and the center of the lower gasket are provided with penetrating holes used for installing bolts, a lower gasket outer edge is integrally arranged on the surface of the outer side of the lower gasket, and a lower gasket inner edge is arranged on the portion, located on the periphery of the penetrating holes, of the inner side of the lower gasket. A groove is formed in the outer surface of the top end of the lower gasket, and the strain material is installed in the groove. According to the gasket type screw looseness detection, the bolt penetrates into the mounting hole of the connecting part, and the gasket and the nut of the device penetrate into the bolt in sequence, so that a bolt standard component does not need to be transformed, the screw is not damaged, and the performance of a bolt connecting piece is prevented from being reduced.

The utility model discloses a precision screw with self-locking and anti-loosening functions, which comprises a screw rod head, a screw rod body is fixedly connected on the side wall of the screw rod head, two sliding chutes which are symmetrically distributed are arranged in the screw rod body, a nut is in threaded connection with the outer side of the screw rod body, and the screw rod head and the screw rod body are in threaded connection. And the upper end of the nut is fixedly connected with two guide rails which are symmetrically distributed. According to the precise screw, the anti-loosening assembly for preventing the nut from loosening is arranged, the manufacturing precision of the precise screw is high, accurate thread fit and fastening force can be guaranteed, and the connection reliability of the precise screw can be further improved through the anti-loosening assembly; due to the design of the anti-loosening assembly, the assembly failure caused by loosening can be reduced, so that the production efficiency is improved, and the production cost is reduced; the anti-loosening assembly can effectively prevent the screw from loosening or falling off caused by external factors such as vibration and impact, so that the stability and safety of equipment or a structure are ensured.

The utility model relates to a motor external power adapter convenient for wiring, which solves the technical problems of extremely complicated wiring process, serious influence on work efficiency, screw loosening leading to poor wire contact and the like. The utility model discloses a power shell with an inner cavity, a circuit board with a direct-current alternating-current conversion circuit is arranged at the inner bottom of the power shell, the opposite sides of the two ends of the power shell are respectively provided with mounting notches, power line connecting seats are respectively arranged in the mounting notches, the end part of the circuit board extends into the mounting notches and is fixedly connected with the power line connecting seats, a plurality of wiring holes are respectively arranged on the power line connecting seats, wiring terminals are arranged in the power line connecting seats, and quick connecting assemblies are movably arranged on the power line connecting seats. The utility model has the advantages that the power line is inserted into the wiring hole, the quick disconnection of the power line and the wiring terminal can be realized by pressing the key, the screwdriver and other tools are not needed, the wiring operation process is greatly simplified, and time and labor are saved.

The utility model relates to the field of wire rolling mills, in particular to a fixing device for an outlet guide pipe of a double-module unit, which comprises a mounting plate, four connecting springs are mounted on the outer wall of one side of the mounting plate, a connecting plate is mounted at the other ends of the connecting springs, and sliding holes are formed in the centers of the connecting plate and the mounting plate. A guide pipe seat is welded to the center of the outer wall of one side of the connecting plate, a guide pipe is slidably connected to the outer wall of the inner side of the guide pipe seat, a funnel-shaped guide pipe hole is formed in the center of the guide pipe, and fixing structures are arranged on the outer walls of the two sides of the guide pipe seat. The fixing structure comprises a movable box welded to the outer wall of the catheter base. After one end of the guide pipe is stressed, the outer wall of the guide pipe is connected into the sliding hole in a sliding mode, the connecting spring is stressed to buffer impact force, one side of the connecting plate makes contact with the supporting block, the impact force is conveniently buffered, screw loosening caused by the impact force is reduced, and installation stability is improved.

The utility model relates to a motor fan housing seat with a stable structure, which comprises an upper cover, a base, a screw, a motor and fan blades, and aims to change the mounting direction of the screw by adding an upper mounting part and a lower mounting part on the structures of the upper cover and the base. The problem that screws of a traditional fan cover seat are loosened due to magnetic field acting force is effectively solved, reliable fastening of the screws is guaranteed, the structural stability of the fan cover seat is improved, and the fan cover seat has remarkable practical value.

This invention relates to the field of workpiece fastening technology, and particularly to an intelligent detection and automatic reset control method for fastening defects based on displacement sensing. The method includes: analyzing fastening depth signals at multiple scales to extract abrupt and steady-state features, providing a comprehensive and crucial data foundation for defect identification; generating feature vectors reflecting the fastening process state by identifying fastening stages and rationally fusing features, thus improving the reliability of defect judgment; identifying multiple fastening defect types by employing models and attention mechanisms, thereby improving the accuracy and comprehensiveness of defect detection; controlling the electric screwdriver's actions by generating a reverse compensation strategy based on steady-state offset features, ensuring fastening quality; determining a reasonable screw removal mode by comprehensively analyzing abrupt energy characteristics and monitoring and judging screw loosening in real time, achieving efficient handling and refeeding of stripped thread defects; and verifying reset results in real time and triggering intervention by accumulating failure counts, ensuring a stable and reliable fastening process.

The utility model discloses a bedstead convenient to assemble, first connecting members are arranged at four corners of a bedstead main body, each first connecting member comprises a first connecting body, a second connecting body and a supporting leg arranged on the first connecting body, at least one part of the second connecting body is lapped on the first connecting body, and the supporting leg is arranged on the second connecting body. A part of the first connecting body is arranged in the first supporting beam in a penetrating mode, and a part of the second connecting body is arranged in the second supporting beam in a penetrating mode. Compared with the traditional design that screws are used for direct connection, the design has the advantages that the gravity including the weight of the bedstead body, bedding articles and people can be effectively and directly acted on the first connecting components, so that the overall weight (including the weight of people and the bedstead body) of the bedstead is transmitted to the ground, and the design enables the force distribution to be more uniform; therefore, concentration of local stress is reduced, the situation that screws directly bear gravity in a traditional design is avoided, the risk that the screws are loosened or damaged due to long-term stress is reduced, and meanwhile the assembling efficiency of the bed frame is improved.

This utility model discloses a turbine housing forming tool, specifically relating to the field of tool technology. It includes a tool body for forming turbine housings, an externally connected snap-fit ​​bracket, an end connector block for fixing an external tool holder at one end of the snap-fit ​​bracket, and an internal fixing cavity for inserting the tool body. A contact mechanism is provided between the inner wall of the fixing cavity and one end of the tool body. Four protrusions are arranged in a ring at equal intervals on the outer wall of the tool body. This utility model, through the contact mechanism, compresses a spring when the positioning pin is inserted into the positioning groove at the end of the tool body, generating a thrust that causes the tool body to move outward. Furthermore, by providing four screw-in screws, a locking effect can be achieved in multiple positions, preventing the tool body from becoming loose due to a single screw loosening.

The utility model discloses a body fixing support of an underwater propeller. The body fixing support comprises a fixing support body, an isolation pad, a first binding band, a second binding band and a third binding band. The upper end and the lower end of the fixing support are provided with bandage through holes, and the fixing support protrudes upwards to form an isolation pad. Bandage via holes are formed in the two sides of the isolation pad, the upper surface of the isolation pad is in an arc shape and is matched with the outer contour of the propeller, and mounting holes are formed in the isolation pad. The first bandage and the second bandage penetrate through the upper end and the lower end of the fixing support respectively, and connecting pieces are arranged at the two ends of the first bandage and the two ends of the second bandage respectively. The third binding band penetrates through the isolation pad, and connecting pieces are arranged at the two ends of the third binding band. The support is provided with the anti-skidding shock insulator, the surface of the shock insulator is matched with the propeller in shape, the propeller is fixed on the shock insulator through the screw, and the screw is prevented from loosening. Three binding bands are arranged at the upper position, the middle position and the lower position of the support, the upper binding band and the lower binding band are fixed to the human body, the middle binding band is fixed to the propeller, and the propeller can be further fixed.

The utility model relates to the technical field of door and window accessories, in particular to a pulley assembly and a door and window. The pulley assembly comprises a connecting base, pulley modules oppositely arranged on the connecting base and a sliding piece connected in the connecting base in a sliding mode, a limiting hole is formed in the connecting base, a threaded hole coaxial with the limiting hole is formed in the sliding piece, a threaded rod is rotationally arranged in the limiting hole, and the threaded rod is connected with the sliding piece in a threaded mode. A threaded hole is formed in the sliding part, the threaded rod is connected with the sliding part in a threaded mode through the threaded hole, a protruding edge corresponding to the door and window sash body and a wedge-shaped protruding block corresponding to the sliding part are arranged on the connecting base, and when the threaded rod drives the sliding part to slide along the connecting base, the wedge-shaped protruding block abuts against the protruding edge. The sliding piece can abut against the wedge-shaped protruding block to protrude out of the connecting base so that the protruding edge can abut against and be locked with the door and window sash body in the direction perpendicular to the sliding direction of the sliding piece. By the adoption of the mode, the probability that abnormal sound is generated due to loosening of the screws can be reduced, and the use stability can be improved.

The utility model provides an intelligent manufacturing mould with a locking structure, which comprises a base, the top of the base is in sliding connection with a lower mould, and the outside of the base is fixedly connected with a fixing frame. The utility model relates to an intelligent manufacturing mold with a locking structure, which records that a lower mold can be limited and prevented from sliding displacement through meshing of a locking block and a rack in the daily use process, and when the lower mold needs to be replaced or maintained and cleaned due to horizontal displacement, the lower mold can be locked by the locking block and the rack. The unlocking rod is pressed to enable the trigger block to generate displacement sliding, the locking block and the rack can be disengaged through linkage of the sliding rod, unlocking is completed, and then the lower die can horizontally slide and move in the base, flexibility and convenience are improved, the lower die can be conveniently and rapidly locked, the working efficiency is improved, and the elastic force of the limiting spring is reduced. And the screw loosening caused by vibration during the operation of the whole device can be avoided, and the stability is improved.

The invention discloses a fault diagnosis method based on displacement vibration of a machine tool feed shaft, and belongs to the technical field of machine tool fault diagnosis. According to the method, acceleration sensors are installed on key parts of a machine tool, sampling frequency is set to collect data, after mean filtering preprocessing, displacement is calculated through integration, data are segmented with the displacement as a horizontal coordinate according to key nodes of a machining technology or a movement track, time domain, frequency domain and time-frequency domain characteristic parameters are extracted, and differences are compared and analyzed. Meanwhile, when a machine tool normally operates and a fault is simulated, displacement is used as an index to construct a sample library to label a fault type and a displacement interval, a convolutional neural network is adopted to input a characteristic parameter training model containing displacement information, and a fault characteristic mode is learned to realize accurate diagnosis of the feed shaft fault. According to the method, faults such as bearing abrasion, lead screw looseness and poor guide rail lubrication can be accurately recognized, the accuracy and real-time performance of machine tool fault diagnosis are effectively improved, the operation reliability and stability of a machine tool are enhanced, and the production loss is reduced.

The utility model relates to the field of self-tapping screws, and provides an anti-torque self-tapping screw for a building shear wall, which comprises a body. The smooth section is arranged on the outer surface of the body, and a bottom plate is fixedly arranged on the outer surface of the smooth section in a sleeving mode. During use, the body is fixed into the shear wall, the fixing plate is rotated to press the reinforcing plate downwards, and then the reinforcing plate makes contact with the surface of the shear wall; the contact area between the screw and a shear wall can be effectively increased through the reinforcing plate, the phenomenon of local stress concentration is reduced, the screw can be more stably fixed in the wall, material damage or screw loosening caused by too large local stress is avoided, the reinforcing plate is composed of the isolation layer, the inner layer, the torsion-resistant layer and the outer layer, and therefore when the screw is used, the screw can be prevented from being damaged by the isolation layer, the inner layer, the torsion-resistant layer and the outer layer. The structural stability, the torsion resistance and the dispersed stress of the screw are improved through the reinforcing plate, and the practicability of the screw is improved.

The invention relates to a bone cement screw, a repair tool and a repair method.The bone cement screw comprises a main screw and a screw base, the main screw comprises a screw head and a screw body, a ball head is arranged at the top of the screw body and connected with the screw head, after the main screw is arranged, the screw head and the screw body are broken and separated, and a third center hole is formed in the screw base; a first containing groove and a second containing groove which are communicated are formed in the bottom end of the third center hole, the first containing groove is located below the second containing groove, a ball support is arranged in the first containing groove, a universal pad is arranged in the second containing groove, the ball support is provided with a lower position and an upper position, and a through hole located in the same central axis with the third center hole is formed in the bottom of the ball support. When the ball support is located at the lower position, the through hole prevents the ball head from passing through, the ball head jacks the ball support to the upper position, the through hole is enlarged, the ball head passes through the ball support, the ball support falls to the lower position under the action of gravity, and the through hole recovers. According to the invention, reworking design in a thread-free assembly form is adopted, corresponding treatment of vertebral slippage after vertebral fracture is allowed, and the problem of thread loosening is avoided.

The utility model provides an internal connection type top end L-shaped elbow for a circular handrail, which relates to the technical field of building decoration and specifically comprises an elbow body, a protruding joint is arranged at one end of the elbow body, the end of the joint close to the elbow body gradually becomes smaller outwards, and the joint extends towards the inside of the elbow body to form a reinforcing rib. The section of the connector is rectangular, and the periphery of the connector protrudes to form a wedge face, so that the elbow can clamp the handrail more firmly, and sliding or falling off is prevented. A round through hole is formed in the center of the connector, and it is guaranteed that the connector can bear certain deformation when a wedge face is extruded in the installation process. According to the utility model, the joint is completely hidden in the handrail, so that the potential safety hazard caused by screw looseness is avoided, the whole handrail looks more concise and smooth, no screw trace exists, the overall appearance quality is greatly improved, the installation and the maintenance are easy, and the handrail is suitable for circular tube-shaped handrails which are made of various materials and have different diameter specifications; and the composite material is widely applied to the fields of stairs, balcony guardrails, public facilities and the like.

The utility model relates to the technical field of buckle type fasteners, and discloses a buckle type fastener convenient for blind installation and positioning, which comprises a screw, a sliding ring is arranged on the outer wall of the screw, the outer wall of the sliding ring is connected with a nut through a buckle assembly so as to limit the sliding ring after the screw is installed, a threaded groove is arranged on the inner wall of the sliding ring, and the threaded groove is connected with the nut. A groove is formed in the top end of the screw, the direction of the threaded groove is the same as the thread direction of the screw, and connecting blocks are fixedly connected to the front end and the rear end of the sliding ring. According to the anti-loosening screw, after the screw is rotated into the sliding ring, the clamping block is clamped on the upper side of the sliding ring to limit the screw, mechanical locking can be formed through rigid meshing of the clamping block and the sliding ring, screw loosening caused by external force such as vibration and impact is effectively resisted, and compared with a traditional anti-loosening mode, the anti-loosening screw has a more stable limiting effect; and the structure is compact and simple, clamping and fixing can be rapidly completed without additional tools during assembling, the assembling efficiency is improved, and positioning time consumption is reduced.

The utility model belongs to the technical field of batteries, particularly relates to automatic equipment for a welding process of zinc-based square battery pole pieces, and aims to solve the problems that in the prior art, screws are easy to loosen, poor connection between pole lugs occurs, poor welding occurs, and positive and negative pole pieces vibrate during friction heat welding due to screw mounting, so that the welding quality is poor. In order to solve the problems, the utility model provides the following scheme that the powder on the pole piece is loosened and falls off, and the device comprises a workbench; the front-back motor module is fixedly installed on the workbench, the up-down motor module is arranged on the front-back motor module, the welding gun fixing block is fixedly installed on the up-down motor module, the cold welding gun is fixedly arranged on the welding gun fixing block, and a protection plate is arranged at one end of the welding gun fixing block. The lithium ion battery is simple in structure, solves the problems of loosening of screws in a screw joint mode, poor welding of a negative plate in a resistance welding mode and falling of powder on the negative plate in an ultrasonic welding mode, and is convenient for people to use.

The stacking machine pallet fork of the special-shaped structure comprises a bottom plate unit, a middle unit and an upper unit, the bottom plate unit comprises a lower-layer fixing plate, a driving motor, a speed reducer, a bottom plate gear and a first transmission rack, and the middle unit comprises a middle-layer special-shaped plate, a second transmission rack and a middle-layer plate gear. The upper unit comprises an upper layer fixing plate and a third transmission rack. According to the utility model, the integrated special-shaped middle-layer book is adopted as a middle driving plate, precise form and location tolerance is achieved, assembly personnel do not need to concern about the assembly problem, and one-time assembly forming can be carried out. And meanwhile, deformation caused by looseness of screws assembled by multiple mechanisms in the prior art does not exist in the long-time using process, high-precision tolerance is achieved, and meanwhile the service life of the pallet fork is greatly prolonged.

The utility model discloses a shower valve control panel assembly, and relates to the technical field of bathroom equipment, the shower valve control panel assembly comprises a bottom plate and a pressing type waterway control assembly arranged on the bottom plate, the pressing type waterway control assembly comprises a pressing substrate, a pressing panel and a waterway control pressing assembly, the bottom plate is provided with a pressing assembly mounting hole, a plurality of clamping holes and a plurality of first pin sleeves; the pressing base plate is provided with a plurality of buckles and a plurality of second pin sleeves. The buckles are clamped in the clamping holes in a one-to-one correspondence manner, and the second pin sleeves are sleeved in the first pin sleeves in a one-to-one correspondence and interference manner; the pressing panel is provided with a plurality of plug pins which are in interference fit with the second pin sleeves in a one-to-one correspondence mode. The connection mode of interference fit of the buckle, the pin bush and the like is adopted, screw connection in the prior art is replaced, and rapid assembly and simple and convenient maintenance are achieved; due to the design of the buckle and the pin sleeve, the installation operation is simplified, the stability of the whole structure is improved, and hidden dangers possibly caused by loosening of the screw are effectively avoided.

This utility model relates to the field of hinge technology, specifically to a two-stage force-buffered hinge for furniture cabinets. This hinge achieves two-stage motion control through the synergistic action of a torsion spring and a damping cylinder. When the cabinet door is opened, the torsion spring accumulates energy while the damping cylinder provides initial buffer resistance. When a specific angle is reached, the damping cylinder automatically switches to progressive strong damping. During the closing process, the torsion spring releases energy to assist in resetting. The damping system offsets the impact force in stages, enabling the cabinet door to achieve stepless hovering at any position, avoiding the sudden opening and closing phenomenon of traditional hinges, significantly reducing cabinet collision noise. The rigid connection between the fixed side plate and the hinge seat ensures the overall load-bearing strength. The rubber gasket continuously absorbs vibration energy to prevent screws from loosening. The linkage structure between the main hinge arm and the inner rocker arm maintains precise motion trajectory. The sliding cooperation between the connecting block and the moving block eliminates mechanical clearance. The fixed shaft maintains the axial stability of the damping assembly.

This utility model discloses a firmly connected sand pump casing, including a housing. A connecting plate is connected to the side of the housing by multiple screws. A circular plate is fixedly connected to the connecting plate. A cylinder is fixedly connected to the side of the circular plate. A circular tube is rotatably and slidably connected to the outside of the cylinder. A top plate is fixedly connected to the side of the cylinder. A first compression spring is provided between the top plate and the cylinder. The first compression spring is sleeved on the outside of the cylinder. A connecting pipe is connected to the side of the circular tube through a connecting seat. A reinforcing seat is rotatably connected to the connecting pipe. The bottom of the reinforcing seat is provided with a regular hexagonal groove adapted to the screw. Multiple first triangular teeth are evenly provided on the outside of the reinforcing seat. Multiple anti-counterclockwise rotation mechanisms are provided on the connecting pipe, which can reinforce the screw, prevent the screw from loosening, and ensure the firmness of the connection between the connecting plate and the housing.

The utility model discloses a kind of paper roll dispensers mounting structure, it is related to the technical field of dispenser, including paper towel box and dispenser, quick connecting mechanism includes connecting seat and connecting block, elastic chucking portion is built into contraction groove, the side of dispenser is equipped with the press type unlocking portion matched with elastic chucking portion;The utility model is by setting elastic chucking portion, with the elastic feature shown under the reset spring effect of locking block, the fixed operation of dispenser is extremely simple, only needs in the process of connecting block insertion connecting seat, entire fixing action can be automatically completed, compared with screw fixing mode generally used in prior art, this elastic chucking portion scheme advantage is remarkable, on the one hand, avoid cumbersome screwing operation, greatly shorten installation time, improve assembly efficiency;On the other hand, reduce the risk that component connection is not firm due to screw loosening, enhance the stability and reliability of structure.

The utility model relates to the technical field of hinges, in particular to a novel durable hinge which comprises a left hinge piece, a right hinge piece is arranged on one side of the left hinge piece, a shaft barrel is welded to the surface of the left hinge piece, a shaft rod is welded to the surface of the right hinge piece, and the shaft rod is installed in the shaft rod. The shaft rod and the shaft barrel are in running fit with each other; an auxiliary rotation structure is arranged between the shaft barrel and the shaft rod, and the auxiliary rotation structure facilitates rotation work of the shaft barrel and the shaft rod; mounting grooves are further formed in the surfaces of the left folding piece and the right folding piece, and reinforcing structures are arranged on the surfaces of the mounting grooves in the upper end and the lower end. According to the hinge, the contact area during bearing is increased, the service life of the hinge is prolonged, and the phenomenon of screw loosening caused by long-time use can be prevented; and the noise phenomenon caused by friction between a shaft barrel and a shaft rod when an existing hinge rotates after being installed is avoided.

To more simply detect looseness of a screw.SOLUTION: In a fastening component, of a plurality of leaf spring parts of a washer, leaf spring parts that are in contact with a portion of a back surface of a screw that does not have a recess are pressed down by the back surface of the screw in a direction toward a substrate, and is electrically connected to one of a plurality of conductive patterns. When one or more of the plurality of leaf spring parts are electrically connected to the plurality of conductive patterns, the plurality of conductive patterns is electrically connected to each other via one or more leaf spring parts.SELECTED DRAWING: Figure 1