521 results about "Fixed hinge" patented technology

The utility model discloses an automobile engine cover hinge assembly correcting device which comprises a base plate and a top plate, the base plate and the top plate are fixedly connected through a vertical plate, the base plate is provided with a first fixing seat, the lower end face of the top plate is provided with a linear motor module, the linear motor module is provided with an electric cylinder, and the electric cylinder is provided with a second fixing seat. One end of the electric cylinder is connected with a driving plate, a hinge assembly main body is placed on the first fixing seat, and the hinge assembly main body is located between the first fixing seat and the driving plate; the hinge assembly is fixed in a negative pressure adsorption mode, the connection mode between the hinge assembly and the automobile body and the connection mode between the hinge assembly and the engine cover are simulated, the electric cylinder drives the driving plate to do axial reciprocating motion, and the opening and closing action of the automobile engine cover is simulated; when the hinge arm of the hinge assembly is in the bent state, the position of the second hinge base relative to the first hinge base is adjusted and corrected through the linear motor module, manual correction is replaced, and the correction efficiency is improved.

The present invention discloses a robot shoulder joint device, which is installed on a back plate in a robot body and is used to connect a robot arm, including a fixed hinge support and a joint seat; the fixed hinge support is fixedly connected to the back plate, a joint seat hinge hole is provided on the fixed hinge support, the central axis of the joint seat hinge hole is perpendicular to the back plate, a joint seat hinge shaft matching the joint seat hinge hole is provided at the bottom of the joint seat, and the joint seat is hinged to the fixed hinge support; an arm connecting flange is provided on the joint seat; a meshing worm wheel and worm are provided on the fixed hinge support, the output center axis of the worm wheel is fixedly connected to the hinge shaft of the joint seat, and an arm side-swing reduction motor is connected to the input shaft of the worm; the robot shoulder joint device of the technical solution of the present invention utilizes a worm gear pair to realize the lateral swing of the robot arm, and the device utilizes a motor-built-in reduction motor, so that the robot shoulder joint has the advantages of small size, light weight and large output torque.

The invention discloses a roller screw external thread grinding force measuring method. The method comprises the steps that a to-be-measured screw is installed on an external thread grinding machine tool in the mode that the to-be-measured screw is clamped by tips at the two ends of the machine tool; the two mechanical sensors are installed at the center position right facing the lead screw to be measured and face the normal grinding force direction and the tangential grinding force direction respectively; a to-be-measured lead screw clamped by double tips is regarded as a simply supported beam structure of which one end is fixed and hinged and the other end is movable and hinged, a mechanical sensor is regarded as an elastic support, a mechanical model is established, and the relationship among the measurement result of the mechanical sensor, an actual method and tangential grinding force at different grinding positions is obtained; and according to the measurement result of the mechanical sensor, the actual method and the tangential grinding force are obtained by utilizing the relation between the measurement result of the mechanical sensor at different grinding positions and the actual method and the tangential grinding force, and the actual grinding force is obtained after vector superposition. The device has the characteristics of clear and definite measurement principle, accurate and reliable measurement result, simple structure and convenience in assembly.

The invention relates to a floating icebreaking simulation test device for a large-scale icebreaking structure model, which comprises a base platform, a plurality of pressurizing mechanisms are fixed at the top of the base platform at intervals, and pressure is applied to a typical icebreaking structure through the pressurizing mechanisms; each pressurizing mechanism structurally comprises an electro-hydraulic servo loading actuator, the output end of the electro-hydraulic servo loading actuator is connected with the working end face of an input pressure head, the input pressure head and one end of a lever cross beam are rotationally installed, the other end of the lever cross beam and an output pressure head are rotationally installed, and the working end face of the output pressure head is fixed to the top end face of a distribution beam. The two ends of the bottom end face of the distribution beam are provided with a fixed hinge support and a sliding support in a matched mode respectively. The device can be used for simulating the stress state of a typical icebreaking structure of an underwater vehicle under a floating icebreaking working condition, collecting strain response data and deformation response data of the typical icebreaking structure under the action of a distributed ice load, and obtaining the ultimate bearing capacity breaking pressure and the breaking form of the typical icebreaking structure.

The utility model provides a hinge device and refrigeration equipment, and the hinge device comprises a fixed hinge part which is used for being fixed on a box body; one end of the connecting rod assembly is movably connected to the fixed hinge piece, and the other end of the connecting rod assembly is used for being connected to a door body; the power assisting mechanism is provided with a rotating end and a force applying end, the rotating end is rotationally connected to the fixed hinge piece, the force applying end is opposite to the rotating end and used for acting on one connecting rod in the connecting rod assembly, the force applying end is provided with a limiting shaft, the fixed hinge piece is provided with a limiting groove, and when the power assisting mechanism rotates around the rotating end, the limiting shaft is driven by the limiting groove to rotate. The limiting shaft moves in the limiting groove; the corresponding power-assisted door closing angle / power-assisted door opening angle and the disengaging angle of the power-assisted mechanism and the connecting rod assembly can be controlled by setting the track and the length of the limiting groove, and the smoothness of door opening and closing is improved.

The utility model discloses a shallow sea seaweed planting platform and relates to the technical field of marine ecological restoration. Comprising a traction ship, an offshore platform, a mesh belt reel, a seed mesh belt, compression rollers, degradable nails and supporting rods. The traction ship is connected with the offshore platform and can drive the offshore platform to move; the mesh belt reel is fixedly mounted on the offshore platform, the seed mesh belt is wound on the mesh belt reel, and the degradable nails are used for fixing one end of the seed mesh belt on the seabed in a needle pricking manner; one end of each supporting rod is in hinged connection with the offshore platform through a fixed hinge point, so that the supporting rods can rotate around the corresponding hinge points, the supporting rods rotate in a plane, and the net belt reel and the rotating plane are coplanar; and a compression roller is arranged at the other end of the supporting rod and can rotate on the corresponding end point of the supporting rod. The planting efficiency is improved, manual operation is partially replaced, and the operation process is simplified.

The utility model provides a folding chair frame and a folding dining chair, the folding chair frame comprises a plurality of supporting leg rods and a plurality of connecting assemblies, the plurality of connecting assemblies are connected between every two adjacent supporting leg rods in a one-to-one correspondence mode, and fixed hinge pieces and sliding hinge pieces are arranged on the supporting leg rods. The sliding hinge piece is located between the fixed hinge piece and the bottom end of the supporting leg rod, and the sliding hinge piece can slide along the supporting leg rod; the connecting assembly comprises crossed rods which are arranged in pairs in a crossed mode, the crossed rods are hinged to one another at the crossed positions, the top ends of the crossed rods are hinged to the fixed hinge pieces on the supporting leg rods on one side, and the bottom ends of the crossed rods are hinged to the sliding hinge pieces on the supporting leg rods on the other side; and the bottom ends of the supporting leg rods can be telescopically adjusted. According to the folding chair frame provided by the utility model, when the folding chair frame is unfolded, the bottom ends of the supporting leg rods can still be telescopically adjusted, so that the height of the folding chair frame can be flexibly adjusted, and the adaptability of the folding chair applying the folding chair frame provided by the utility model to complex scenes is ensured.

The invention relates to the technical field of hinge assembly, and discloses a hinge assembly system and process, and the hinge assembly system comprises a first jig, a second jig, a third jig and a fourth jig. The first jig is provided with a lower-layer clamping mechanism and an upper-layer clamping mechanism and is used for clamping a hinge part; the second jig is provided with a first clamping mechanism and a second clamping mechanism which are arranged in a sliding mode and used for clamping and assembling the hinge. The third jig is provided with an inclined pushing mechanism and a side pushing mechanism and is used for positioning and turning over the product; the fourth jig is provided with an inclined pushing mechanism and an upper pressing plate, and the first jig, the second jig, the third jig and the fourth jig are sequentially distributed according to the assembly sequence. The assembling technology comprises the steps that the hinge products are clamped, assembled, positioned and fixed in sequence through the jigs, and finally the final assembly of the hinge is completed in the reserved space through the mechanical arm. All the steps are independent and cooperate with one another, automatic assembly of the hinge is achieved, manual intervention is reduced, and the assembly efficiency and precision are improved.

Provided relates to a hinge-type connector for connecting one-touch folding tent frame members that comprise: at least 4 base frame members and at least 2 frame members on the free end of each base frame that is connected in a line by a hinge-type connector; a spring that presses the sleeve toward the locking direction of the fixed hinge and a spring seat for supporting the lower end of the spring.

The present invention provides an integral coordinated concrete explosion-proof wall. The present invention belongs to the field of explosion-proof engineering. Through the impact force acting on the explosion-proof fiber concrete, the energy is transferred to the energy absorption and shock absorption layer and the external arch-type connected energy-absorbing steel plate. With the help of high-strength fixed hinges and ordinary fixed hinges, the energy-absorbing extrusion support steel plate fan and the energy-absorbing support connection steel plate are deformed and consume energy through elastic support connecting rods and elastic transmission connecting rods. At the same time, the concrete filled with damping materials is squeezed and energy is consumed. Fixed hinges and elastic connecting rods are set to make the coordinated connection performance of the energy-absorbing steel plate fan good, disperse and conduct the explosion impact force, and significantly improve the energy consumption efficiency. Through the coordination of the structure itself, the impact force is buffered in multiple layers. At the same time, the supporting effect of multiple energy-absorbing extrusion support steel plate fans makes the overall structure have explosion-proof shock absorption and buffering energy consumption while having sufficient strength.

The invention relates to the technical field of spherical elastic bearings, in particular to a multi-layer rubber bearing for a vehicle body hinging device and an application and design method of the multi-layer rubber bearing. The multi-layer rubber bearing for the vehicle body hinge device comprises an upper connector, a plurality of spacers and a lower connector which are sequentially arranged and a rubber layer integrally formed among the upper connector, the spacers and the lower connector, the upper connector comprises a convex spherical surface end, the lower connector comprises a concave spherical surface end, the spacers are hemispherical spacers, and the rubber layer is arranged between the upper connector and the lower connector. The convex spherical surface end of the upper connector, the concave spherical surface end of the lower connector and all the spacers share the same sphere center, and the convex spherical surface end of the upper connector extends into the concave spherical surface end of the lower connector. The application method of the multi-layer rubber bearing for the vehicle body hinging device comprises the step that the far ends of the upper fixed hinge and the lower fixed hinge are connected with adjacent vehicle bodies respectively. The design method of the multi-layer rubber bearing for the vehicle body hinge device comprises the step of adjusting the product performance by changing the characters of the rubber layers and the spacers.

The utility model discloses a working face belt conveyor telescopic conveying device which comprises a plurality of belt telescopic devices, a guide rail pushing device and a machine body traction device and is connected with two parallel bearing guide rails through lifting oil cylinders, idler wheels and guide rail hydraulic clamping devices. Adjacent fuselage telescopic devices are connected and fixed through multiple pairs of telescopic hinges, the number of the hinges is adjustable, and different telescopic distance requirements are met. The belt telescopic device is provided with an upper carrier roller assembly, a lower carrier roller assembly, and an oil cylinder, a roller and a guide rail hydraulic clamp which are used for the guide rail pushing device; the guide rail pushing device comprises a pushing oil cylinder, a pushing oil cylinder sliding end, a bearing guide rail and a guide rail hydraulic clamping device. The machine body traction device is mainly composed of a traction mechanism connecting frame, a hydraulic motor, a traction roller, a traction rope and the like and used for unfolding the belt conveyor folding machine body.

The invention provides a charging port cover and a vehicle, and relates to the technical field of vehicle charging port covers. The charging port cover comprises a base which is fixed on a vehicle body and is provided with a peripheral port; the outer plate rotates relative to the base, and the outer plate is configured to cover and expose the base on the vehicle body; the hinge arm is rotationally connected with the base and fixed to the outer plate, and the hinge arm comprises a connecting part rotationally connected with the base; the main body part is fixed with the connecting part, and when the outer plate covers the base, the main body part is inserted into the peripheral opening; the soft rubber part is arranged on the periphery, close to the outer plate side, of the main body part, and when the outer plate covers the base, the soft rubber part abuts against the peripheral side of the peripheral opening; the soft rubber part abuts against the outer plate in an interference mode, and a drainage groove surrounding the main body part by a circle is formed between the soft rubber part and the outer plate. The soft rubber part abuts against the outer plate in an interference mode, water flow is blocked on the outer side of the soft rubber part, in other words, water cannot enter the main body part through the gap between the outer plate and the main body part, and therefore water absorption deformation of the main body part is effectively reduced.

This utility model discloses an improved automotive door hinge assembly, including a fixed hinge, an opening hinge, an elastic element, and a pivot. The fixed hinge has a connecting seat, the opening hinge has a connecting arm, and the pivot is located at the connection between the connecting arm and the connecting seat. The fixed hinge has a limiting element that restricts the rotation angle of the opening hinge, and the limiting element includes a connecting rod. The connecting seat has an arc-shaped groove that slides with the connecting rod. The beneficial effects are as follows: When the protrusion of the sliding block slides with the groove, a large force is required to make the relative displacement between the sliding block and the damping block occur because the sliding block and the damping block are tightly engaged. When the sliding block and the damping block are disengaged, the resistance experienced by the sliding block is reduced, so the sliding of the sliding block in the sliding cavity is smoother. This application achieves that the resistance is large when the car door is first opened, and the resistance decreases when the car door is opened to a certain angle.

The auxiliary support comprises a bottom plate, one end in the bottom plate is rotationally connected with a fixed hinge shaft, the two sides of the fixed hinge shaft are hinged to one ends of movable connecting rods respectively, and the other ends of the movable connecting rods are rotationally connected with the two ends of a movable hinge shaft respectively. The middle of the supporting shaft is fixedly connected with a connecting base, one end of the connecting base is fixedly connected with one end of a threaded rod, and the other end of the threaded rod is connected with one end of an inner threaded cylinder in a sleeved mode through a threaded structure. The other end of the internal thread cylinder is rotationally connected with a clamping block, the clamping block is clamped and matched with a clamping groove, and the clamping groove is concavely formed in the middle of the top surface of the bottom plate; sliding openings are formed in the two sides of the bottom plate respectively, adjusting bases are slidably arranged in the sliding openings, one ends of the adjusting bases are hinged to one ends of supporting connecting rods, and the other ends of the supporting connecting rods are hinged to one sides of movable connecting rods respectively.

The utility model discloses a hinge mechanism for a window and a ship window, which comprises a fixed hinge seat and a movable hinge plate, the fixed hinge seat is fixedly connected with a window frame, the movable hinge plate is fixedly connected with a window leaf, the movable hinge plate is rotatably connected to the fixed hinge seat through a pin shaft, and the hinge mechanism also comprises a locking assembly, the locking assembly is used for achieving locking of the window sash. Compared with the prior art, through the arrangement of the locking assembly, the window sash can be effectively locked, the situation that the window sash is blown by wind to be collided and damaged is avoided, the structure is simple, and operation is convenient.

This utility model relates to the technical field of vehicle protection devices, specifically disclosing a folding bracket for a protective grille. It includes fixed hinges, a locking mechanism, a folding post, and a folding crossbeam. Several fixed hinges are fixedly installed on the vehicle body surface, with a locking mechanism hinged to each hinge. A folding post is installed on the locking mechanism, and a folding crossbeam is provided above the folding post, hinged to the folding post. By providing the locking mechanism and fixed hinges, the protective grille can be folded down when needed by the folding action of the folding post, thereby lowering the position of the folding crossbeam and the protective grille on it. The folding post and locking mechanism are connected by a socket joint, allowing for quick replacement if the folding post, folding crossbeam, or protective grille is damaged.

The invention discloses an air conditioner mounting rack, and relates to the technical field of mounting racks, and the air conditioner mounting rack is characterized by comprising a hook plate and a connecting box, the hook plate is provided with a plurality of first fixing holes, the connecting box is provided with a plurality of second fixing holes penetrating through the connecting box, and the hook plate is detachably connected with the connecting box through the first fixing holes and the second fixing holes; a plurality of connecting plates are arranged in the connecting box, fixing hinges are rotationally connected to the two side walls of the connecting plates, a plurality of third fixing holes are formed in the fixing hinges, the adjacent fixing hinges can be fixedly connected through the third fixing holes and bolts, and the fixing hinges can be fixedly connected through the third fixing holes, the second fixing holes and bolts. Installation modes can be flexibly selected according to different installation scenes, the connecting strips are formed through the multiple connecting plates and the fixing hinges in the device and assembled on the structural framework, the device is not limited by sites during installation, and therefore the installation efficiency is improved, and the applicability is higher.

The utility model relates to a tension test device for detecting the bonding strength of a concrete block. The utility model is suitable for the technical field of tension test equipment. The technical problem to be solved by the utility model is to provide the tension test device for detecting the bonding strength of the concrete block. According to the technical scheme, the tension test device for detecting the bonding strength of the concrete block comprises a support, a tension test device and a tension test device, the horizontal hydraulic cylinder is arranged on the support, the output end of the horizontal hydraulic cylinder is connected with a lifting lug through a lifting shaft, and the horizontal hydraulic cylinder is connected with a first test concrete block through the lifting lug; the fixed hinged support is arranged on the support, the fixed hinged support is connected with the lifting lug through the lifting shaft, the fixed hinged support is connected with a second test concrete block through the lifting lug, and the first test concrete block and the second test concrete block are bonded through a binder; the control cabinet is arranged on the adjacent side of the support and used for controlling opening and closing of the horizontal hydraulic cylinder.

The utility model relates to the technical field of mobile phone supports, in particular to a magnetic type card-carrying mobile phone support, which mainly solves the problem that a mobile phone support sleeve in the prior art is too thick and single in function, and is provided with a support body consisting of a supporting hinge and a fixed hinge, the top ends of the supporting hinge and the fixed hinge are connected through any stop hinge, and the fixed hinge can be adsorbed on the back of a mobile phone. The support page can be turned over to be away from the fixed page and suspended, and forms an eave structure capable of supporting a mobile phone to obliquely stand on a horizontal plane with the fixed page, thereby playing a role of a mobile phone support, not sacrificing the holding hand feeling of the mobile phone, enriching the functions of the support body, and being provided with a card carrying bag which can be used for containing cards, thereby being convenient to use. The mirror surface layer can provide a cosmetic mirror for a female user, and has the advantages of simple and fast installation, good mobile phone supporting effect, comfortable holding hand feeling, rich functions and capability of identifying true and false.

The present invention relates to the technical field of railway maintenance machinery, and specifically, to a three-sleeper tamping device. The three-sleeper tamping device includes a frame, at least one excitation device, at least two opening and closing drive devices, tamping arms, and at least two tamping arm transmission devices; the excitation device is installed on the frame and is connected to one end of the opening and closing drive device; the other end of the opening and closing drive device is hinged to the top of the tamping arm; the tamping arm transmission device is hinged between the tamping arms; the tamping arms are all arranged in the vertical direction, with tampers installed at the bottom ends, and the middle parts are hinged to the frame through fixed hinge points and can rotate around the hinge points with the frame. The three-sleeper tamping device has the characteristics of simple structure, few components, and low manufacturing cost.

A refrigerator door mountable for swinging movement between opened and closed positions at the front opening of a refrigerator cabinet by a left-side hinge and a right-side hinge. A left-side handle is associated with the left-side hinge and may be manipulated to release a hinge catch to free a hinge pin of the left-side hinge from a captured condition to allow a left-hand swing opening and closing of the refrigerator door about a hinge pin of the right-side hinge while in a captured condition. A right-side handle is associated with the right-side hinge and is manipulable to release a hinge catch to free the hinge pin of the right-side hinge from a captured condition to allow a right-hand swing opening and closing of the refrigerator door about the hinge pin of the left-side hinge while in a captured condition. A removable hinge block may be positioned to place the hinge pin of the right-side hinge in the captured condition to allow the left-hand swing opening and closing of the refrigerator door or may alternatively be positioned to place the hinge pin of the left-side hinge in the captured condition to allow the right-hand swing opening and closing of the refrigerator door.

The utility model discloses a PVC pipe production discharging traction device which comprises a traction rod, the two ends of the traction rod are fixedly connected with fixed hinge seats, the traction rod is movably sleeved with a movable hinge seat, and the fixed hinge seats and the movable hinge seat are movably hinged to inner supporting plates arranged in the circumferential direction of the traction rod at equal intervals through a driven connecting rod and a driving connecting rod respectively. And a spring buckle which is movably clamped with the traction rod is arranged on the movable hinge seat. By arranging the two groups of fixed hinge seats, the movable hinge seats, the driven connecting rods, the driving connecting rods, the inner supporting plates, the spring buckles and the locking clamping grooves, the inner supporting plates are supported like an umbrella while the end part of the PVC extrusion pipe is cooled and shaped through a towel dipped with cold water, and the fixing effect during traction is achieved through supporting friction force; the umbrella is very convenient to mount and operate, the umbrella is also closed during dismounting, and the dismounting operation is very simple, so that the umbrella is a special tool for pulling the PVC extrusion pipe and the PVC traction pipe, the dismounting operation every time is simple, the use is convenient, and the efficiency is improved.

The water-rich tunnel water inflow dynamic monitoring device comprises a water guide pipe, a supporting rod and a horizontal rod, a fixed hinge shaft is arranged on the pipe wall of the water outlet end of the water guide pipe, the first end of the supporting rod is hinged to the water guide pipe through the fixed hinge shaft, and the first end of the supporting rod is further fixedly connected with an angle measuring scale. A sliding groove is formed in the supporting rod in the length direction, a sliding hinge shaft is connected into the sliding groove in a sliding mode, and one end of the horizontal rod is hinged to the supporting rod through the sliding hinge shaft. When the water inflow of different positions is monitored, the angle of the water guide pipe can be flexibly adjusted, the adjusted angle can be directly read through the angle measuring scale, the device can be rapidly suitable for monitoring the water inflow of drill holes in different positions in a tunnel, especially the water inflow which is difficult to measure such as non-horizontal drill holes, the water inflow is dynamically monitored in real time, the flexibility is high, and the measurement accuracy is high. Operation is simple, and the application range is wide.

A folding sliding door system is applied to a cabinet body with an opening, an upper guide rail is installed at the top of the opening of the cabinet body, and the system comprises a first door body, a second door body and a sliding door, one side of the second door body is connected with the other side of the first door body through a hinge in a swinging mode, and the guide pulley block is installed on the top of the other side of the second door body and connected with the upper guide rail in a sliding mode. The sliding type sliding door has the beneficial effects that the advantages of two opening and closing modes of a sliding door and a sliding type sliding door are combined. By means of the linkage mode of folding first and then sliding, the opening of the whole cabinet body can be completely exposed, and the full-opening effect of the cabinet door is achieved. According to the core advantage, the problem that the opening degree of a traditional sliding door is limited is thoroughly solved, a user does not need to be limited by half or less opening width any more, and objects, including large objects, at any position in the cabinet can be easily stored and taken out without obstacles.

The utility model relates to the technical field of electronic sphygmomanometers, in particular to a rotating shaft structure for an electronic sphygmomanometer, which comprises a base, a rotating shaft component and a movable component, a hinge groove is arranged on one side of the base, hinge mounting tables are arranged on two sides of the hinge groove, and the rotating shaft component comprises a fixed hinge, a movable hinge and a damping rotating shaft. The fixed hinge is connected with the movable hinge through a damping rotating shaft, and the fixed hinge is arranged on the hinge mounting table; the movable assembly comprises a movable shell and a movable connecting base, the movable shell is provided with a rotating shaft connecting table, one end of the movable connecting base is connected with the movable hinge, and the other end of the movable connecting base is connected with the rotating shaft connecting table. Multiple technical effects of stable supporting, stable movement, accurate control, high flexibility, high stability and the like are achieved.

The utility model relates to the technical field of automobile hinges, and discloses a high-strength automobile hinge which comprises a main body mechanism and an auxiliary mechanism, the auxiliary mechanism is located at the outer end of the main body mechanism, the main body mechanism comprises a hinge body, a fixed hinge and a movable hinge, the fixed hinge is located at the rear end of the hinge body, and the movable hinge is located at the rear end of the hinge body. The movable hinge is positioned at the front end of the hinge body; the main body mechanism further comprises a metal copper layer, an anti-corrosion coating, a waterproof coating and a wear-resistant coating, the metal copper layer is fixedly arranged at the inner end of the hinge body, the anti-corrosion coating is fixedly arranged at the outer end of the metal copper layer and fixedly connected with the metal copper layer, the waterproof coating is fixedly arranged at the outer end of the anti-corrosion coating, and the wear-resistant coating is fixedly connected with the waterproof coating. And the waterproof coating is fixedly connected with the anti-corrosion coating. According to the high-strength automobile hinge, by installing the main body mechanism, the protection effect of the automobile hinge is conveniently improved, the problem that the strength is reduced after long-time use is avoided, the service life of the automobile hinge is prolonged, and the practicability is improved.

An automatic flip-top device for a rolled sample bar insulation box is used to automatically flip the insulation box of the rolled sample bar at the sampling station of the bar rolling production line. The device includes a fixed hinge motor (1), a dual output shaft reducer (2), a first connecting rod (3), a power mounting base (4), a movable hinge motor (5), a reducer (6), a clutch (7), a joint shaft (8), a second connecting rod (9), an electromagnet mounting base (10), and an electromagnet (11). The beneficial technical effects of the automatic flip-top device for a rolled sample bar insulation box of the present invention include: (1) By energizing and de-energizing the clutch, the joint can be switched between an active joint and a passive compliant joint, so that the flip-top device has better adaptability to the size and placement error of different insulation boxes, and the flip-top action is more stable and smooth; (2) The entire flip-top device can be folded and stored to reduce space occupation when waiting for work or when idle.

The invention discloses a broadband piezoelectric energy harvesting system based on multi-frequency cooperative resonance and a power generation method. The system comprises a fixed support, a main resonance subsystem and at least two secondary resonance subsystems. The main resonance subsystem comprises a main elastic beam component and a first piezoelectric conversion element fixedly coupled to the main elastic beam component; each secondary resonance subsystem comprises a secondary elastic beam member and a second piezoelectric conversion element fixedly coupled to the secondary elastic beam member. The near end of the main resonance subsystem is connected to the fixed support through a fixed hinge; the near ends of the sub-resonance subsystems are connected to the fixed support in parallel through movable hinges. The far end of the secondary resonance subsystem can be selectively connected to the fixed support through a fixed hinge or a movable hinge. And the main resonance subsystem and each secondary resonance subsystem are independently configured with inherent frequencies to form a multi-frequency-point resonance structure. Through the main-secondary multi-frequency-point parallel cooperative resonance design, the system can effectively respond under wide-spectrum fluid excitation, and the working frequency band range of energy capture is remarkably widened.

A push-pull folding cabinet door system comprises a cabinet body, the front end of the cabinet body is provided with an opening, the top of the opening is provided with an upper hanger rail, and the bottom of the opening is provided with a lower guide rail; one side of the first door body is mounted on the cabinet body through a fixed hinge, so that the first door body can swing to be opened and closed relative to the cabinet body; the other side of the first door body is connected with one side of the second door body through a hinge, and the first door body and the second door body can swing relative to each other and be folded to open the cabinet door. The top of the other side of the second door body is provided with a hanging door pulley block connected with the upper hanging rail, and the bottom of the other side of the second door body is provided with a guide pulley block connected with the lower guide rail. The beneficial effect of the invention is that the full-open effect of the cabinet door is realized. The problem that the opening degree of a traditional sliding door is limited is thoroughly solved, a user can easily store and take articles at any position in the cabinet without obstacles, and the utilization efficiency of the space in the cabinet and the taking and taking convenience are greatly improved.