1227 results about "Hinge point" patented technology

In a sofa seat stretching device, one end of a second support facing away from a first support, and a second leg rest plate connector are hinged at a fourth hinge point, so that the stretching assembly's stretching speed is reduced in a process of switching from a sitting position state to a lying position state when a driving assembly acts in the same way, and the weightlessness feeling can be effectively avoided. Moreover, the driving assembly drives the stretching assembly so that the process of switching the stretching assembly from the lying position state to the sitting position state is smoother.

The invention relates to the field of constructional engineering concrete detection, in particular to a reamer bit and a concrete repairing method.The reamer bit comprises a mounting base, at least two drill arms and at least two supporting rods; one end of the drill arm is hinged with the mounting seat, a fixing pipe is arranged between the hinge points of the drill arm and the mounting seat, the fixing pipe is connected with a positioning rod in a sliding manner, one end of the supporting rod is hinged with the positioning rod, and the other end of the supporting rod is hinged with the drill arm. When the reamer bit is used, the angle of the drill arm can be flexibly adjusted by pressing the positioning rod, the hole diameter of a reaming hole can be accurately controlled according to actual repairing requirements, and the reamer bit is suitable for repairing scenes of coring holes of different sizes and depths; the formed horn mouth with the wide inside and the narrow outside can be embedded into original concrete like a tenon after concrete is poured, the combining capacity of new concrete and old concrete is greatly improved, and it is guaranteed that a repaired area is not prone to separation.

A solar powered plane configured to operate in the stratosphere includes a hinged vertical stabiliser that that pivots about a hinge; the stabiliser extends both above the fuselage and also below the fuselage, and the base of the vertical stabiliser includes a skid. The hinged vertical stabiliser is configured such that when the skid contacts the ground on landing, the top of the vertical stabiliser pivots forwards around the hinge point, minimising damage to the aircraft on landing. the skid includes a lightweight, replaceable sacrificial layer.

The knee joint assembly comprises a first thigh web, a knee joint motor is arranged at the upper end of the side wall of the first thigh web in the X direction, and the output end of the knee joint motor is connected with a first flange plate; a knee joint connecting rod is hinged to the eccentric part of one end of the first flange away from the knee joint motor; the lower end of the side wall of the first thigh web is rotationally connected with a shank web in the X direction. The end, away from the first flange plate, of the knee joint connecting rod is hinged to the upper end of the shank web. The hinge point of the knee joint connecting rod and the first flange plate, the rotating shaft point of the first flange plate, the hinge point of the knee joint connecting rod and the shank web and the rotating shaft point of the shank web form a contra-parallelogram structure. The motion angle range of the knee joint connecting rod can be narrowed on the basis that the requirement for large-angle-range motion of the knee joint of the humanoid robot is met.

The utility model provides a pivot mechanism and lighting fixture, including first swing link component, first swing link component includes swing link base, swing link subassembly and first steering head, swing link subassembly includes first lever arm and second lever arm, the both ends of first lever arm are respectively articulated with swing link base and first steering head at first articulation point and second articulation point, two ends of the second lever arm are respectively hinged with the swing rod base and the first steering head at a third hinge point and a fourth hinge point; a compensation fine adjustment structure is arranged at the end, close to the first steering head, of the second lever arm, and the second lever arm is hinged to the first steering head at a fourth hinge point through the compensation fine adjustment structure. A connecting port is formed in the first steering head, and the distance between the third hinge point and the fourth hinge point is adjusted by adjusting the length of the compensation fine adjustment structure in the axis direction of the second lever arm, so that the first steering head rotates around the second hinge point to keep the orientation of the connecting port in the preset direction.

The invention relates to the technical field of space flight and aviation, in particular to a recoverable rocket landing supporting mechanism which comprises a plurality of folding, unfolding and folding mechanisms. Each folding, unfolding and folding mechanism comprises an on-arrow locking mechanism, an auxiliary air cylinder, a telescopic assembly, a supporting assembly and a buffering device. The upper end of the telescopic assembly is hinged to the rocket body, the lower end of the telescopic assembly is hinged to the bottom end of the supporting assembly through a buffering device, the top end of the supporting assembly is hinged to the rocket body through a left hinge joint and a right hinge joint, and the left hinge joint and the right hinge joint are coaxial and located below the upper end of the telescopic assembly. The locking mechanism on the rocket is located on the rocket body and locks the edge of the supporting assembly after the supporting assembly is tightly attached to the rocket wall; one end of the auxiliary air cylinder is fixed to the arrow body, the other end of the auxiliary air cylinder extends outwards and downwards, the auxiliary air cylinder is located below the telescopic assembly, and when the supporting assembly is tightly attached to the arrow wall, the other end of the auxiliary air cylinder makes contact with the supporting assembly. The invention has the characteristics of large folding-unfolding ratio, reliable locking, high landing stability, small impact peak value and small aerodynamic resistance.

The utility model discloses a mahjong machine with arc-shaped tile feeding and a tile pushing mechanism thereof, the tile pushing mechanism comprises a tile pushing rod, a tile pushing disc and a driving assembly, the tail end of the tile pushing rod is movably connected with a hinge point, a tile pushing groove is formed in the middle of the tile pushing rod, and the head end of the tile pushing rod is used for pushing tiles; a tile pushing bearing is arranged on the top end face of the tile pushing disc and extends into the tile pushing groove to drive the tile pushing rod to swing around the hinge point in a reciprocating mode. The driving assembly is used for driving the tile pushing disc to rotate. When the tile pushing disc rotates, the tile pushing bearing can rotate with the center of the tile pushing disc as the center axis, and due to the fact that the tile pushing bearing is located in the tile pushing groove, rotation of the tile pushing bearing can drive the tile pushing rod to swing in a reciprocating mode, and then the tile pushing action is carried out. The tile pushing mechanism with a novel structure is provided for the mahjong machine. Due to the fact that the tail end of the tile pushing rod is fixed through the hinge point, when force is applied to the middle of the tile pushing rod, the tile pushing bearing can endow the head end of the tile pushing rod with a large swing amplitude with a small rotating radius, and labor is saved.

Sealing plates are detachably installed at the two ends of a lower frame and the two ends of an upper frame, a vertical frame is fixedly installed between the lower frame and the upper frame, an extension rod on one side is pushed to slide, then a rack slides in the upper frame, meanwhile, the rack drives the other rack to slide through a gear in the middle, and the two racks are folded at the same time; the other end of the rack compresses the spring, the rack can drive the sliding rod to slide in the arc-shaped hole through the limiting strip while sliding, then the clamping base, the clamping rod and the lock rod rotate with the hinge point of the clamping rod and the transverse frame as the circle center, the lock rod rotates to extrude the lock head, the lock head rotates around the hinge point of the lock head, and after the lock rod crosses the lock head, the lock head is locked. The lock head falls under the influence of self weight, the bottom of the lock head stops the lock rod from rotating reversely to return, in the process, the extending rod is pushed on one side, the multiple sets of clamping rods can be rotated and erected, and the clamping rods do not need to be straightened one by one by personnel.

An umbrella framework with a smaller umbrella folding size comprises a first main rib, a second main rib and a third main rib, the first main rib is hinged to the second main rib through a first connector, and the second main rib is hinged to the third main rib through a second connector; the second connector comprises a third hinge point and a fourth hinge point, and the fourth hinge point is located on the protruding part of the second connector and hinged to one end of a second stay wire; the protruding part is arranged in the direction away from the third main rib. The folding umbrella has the advantage that the folding umbrella is smaller in size.

A bracket assembly for overhead roll-up doors includes a bracket body, and a head stop extending from the bracket body. The head stop is configured to limit travel of a roll-up door. The head stop includes perforated sections that create a hinge line in the material, allowing bending or rotation relative to the bracket body. The perforated sections include small, precisely spaced holes enabling the head stop to bend or fold into position. The bracket body and head stop form a gap at their intersection, creating a natural hinge point for bending the head stop. The head stop includes punched holes for attaching to vertical guides and additional head stops. The bracket body includes a bracket opening to receive an axle, a bracket stop cap, a tensioning drive, and guide tabs. The bracket body integrating the head stop reduces installation complexity and improves reliability compared to traditional separate component configurations.

The invention discloses an electric pedal and an optimization design method and device thereof, and relates to the technical field of optimization design of electric pedals. According to the technical scheme, when design optimization is conducted on the electric pedal driven by the four-connecting-rod contraction and expansion mechanism to turn over, whether the pedal body of the electric pedal has inward horizontal displacement or not in the outward turning-over process of the electric pedal is judged during optimization, and when the pedal body has inward horizontal displacement, the electric pedal is driven to turn over by the four-connecting-rod contraction and expansion mechanism; if the outward displacement of the pedal in the horizontal direction cannot be accurately controlled on the basis of the structure of the current four-connecting-rod contraction and expansion mechanism, the position of the hinge point of the four-connecting-rod contraction and expansion mechanism is readjusted until the pedal is smoothly unfolded outwards in the overturning process. According to the technical scheme, the four-connecting-rod contraction and expansion mechanism of the electric pedal can be optimized, and the accuracy of horizontal displacement control during overturning of the electric pedal is improved. Meanwhile, according to the optimization design method, the overturning process of the electric pedal can be smoother, and the sensing quality of the electric pedal is improved.

The invention relates to the field of medical instruments, in particular to an abduction assisting device for shoulder joints, which comprises a support, a support plate for bearing arms is hinged to the top of the support, and a driving mechanism, an adjusting mechanism, a fitting mechanism, a support mechanism and a locking mechanism are arranged on the support; the driving mechanism is used for driving the adjusting mechanism, the laminating mechanism and the supporting mechanism to operate synchronously; the adjusting mechanism is used for driving the supporting plate to rotate around the hinge point so as to adjust the abduction angle. The attaching mechanism comprises an air bag fixedly connected to the supporting plate, and the attaching mechanism is used for synchronously inflating or deflating when the angle is adjusted by the adjusting mechanism so as to be attached to the arm; the supporting mechanism is used for synchronously providing or releasing additional supporting force for the supporting plate when the adjusting mechanism adjusts the angle; the locking mechanism is used for locking the adjusting mechanism after angle adjustment is completed. The use process is simplified, the operation threshold is lowered, the rehabilitation preparation time can be saved, and the clinical use efficiency is improved.

The invention discloses a composite toggle type displacement amplification damping device of a self-resetting damper and an assembly method, and belongs to the technical field of structural engineering and structural earthquake resistance, the device comprises a steel frame structure, the self-resetting damper installed on the steel frame structure, a toggle type supporting rod piece and a right-angle curved bar; one end of the self-resetting damper is hinged to the steel frame structure, the other end of the self-resetting damper is hinged to a right-angle curved bar, the end of the first supporting piece and the end of the second supporting piece are hinged to the steel frame structure, and the end of the third supporting piece is hinged to the right-angle curved bar which is hinged to the steel frame structure. A movable triangular plane is formed among the second supporting piece, the third supporting piece, the right-angle curved bar and the self-resetting damper, and a plane formed by connecting lines between hinge points on the right-angle curved bar is a right triangle. The damper can solve the problems of low damping efficiency and large post-earthquake residual deformation caused by insufficient relative deformation of the two ends of an existing damper and incapability of fully dissipating earthquake energy.

The invention relates to the field of pipeline robots, and particularly discloses a pipeline robot and a control method thereof.The pipeline robot comprises a first section body, a second section body, a third section body and a fourth section body which are sequentially hinged, the hinged axes of all the hinged positions are parallel to one another, and the first section body, the second section body, the third section body and the fourth section body are connected into an M shape; the multiple sets of wheel set mechanisms are arranged, and the multiple sets of wheel set mechanisms are arranged at the hinged positions correspondingly and used for driving the first section body, the second section body, the third section body and the fourth section body to advance along the axis of the pipeline; one elastic assembly is arranged between the first section body and the second section body in a tensioning mode, and the other elastic assembly is arranged between the third section body and the fourth section body in a tensioning mode; one driven wheel set is arranged at the end, away from the second section body, of the first section body, and the other driven wheel set is arranged at the end, away from the third section body, of the fourth section body. The pipeline robot has the effect that the pipeline robot needs to adapt to different pipe diameters.

The utility model discloses a condenser pipe multi-pipe end combined processing all-in-one machine, which comprises a rack and a clamping mechanism arranged on the rack and used for clamping a condenser pipe, the rack is provided with a translation seat I and a translation seat II, and the clamping mechanism is positioned between the translation seat I and the translation seat II. The first translation seat is driven by a linear moving mechanism to move on the machine frame, lifting seats are arranged on the first translation seat and the second translation seat, the first translation seat and the second translation seat are connected with the lifting seats through corresponding lifting mechanisms, an inclined pipe machining device with the adjustable angle is arranged on the first translation seat, and an inclined pipe machining device with the adjustable angle is arranged on the second translation seat. The inclined pipe machining device comprises a mounting plate and an adjusting plate hinged to the mounting plate, an angle adjusting and pushing mechanism capable of pushing the adjusting plate to rotate around a hinge point is arranged on the mounting plate, and a plurality of machining units are arranged on the lifting seat and the adjusting plate. According to the structure, the machining efficiency is high, machining of a plurality of procedures is completed through one-time positioning, and therefore the machining precision is improved, and the machining cost is reduced.

The invention relates to the technical field of high-pressure guns, in particular to a labor-saving high-pressure gun which comprises a valve mechanism, the valve mechanism comprises a gun valve sleeve, a valve assembly, a cam and an ejector rod sleeve, the gun valve sleeve comprises a valve body and a hinge body, a water inlet, a water outlet and a valve hole are formed in the valve body, and the valve assembly is arranged in the valve body. The valve assembly can penetrate through the valve hole to be exposed out of the valve body, the cam is provided with a first hinge point and a second hinge point, the first hinge point is connected with the hinge body in a relatively rotating mode through a first fastener, the ejector rod sleeve is fixedly connected with the valve assembly exposed out of the valve body, and the ejector rod sleeve is attached to the surface of the cam. Rotation of the cam can drive the ejector rod sleeve to move, and the ejector rod sleeve drives the valve assembly to move and controls communication of a water inlet channel and a water outlet channel in the valve body. The high-pressure water gun solves the technical problems that an operator needs to keep large hand-holding trigger force for a long time in the whole high-pressure spraying process, and the operator with small hand-holding force cannot normally use the high-pressure water gun.

The utility model relates to the technical field of transfer devices, in particular to a movable support with a folding handle and a household appliance. The inner moving part is arranged in the outer groove plate and can slide relative to the outer groove plate; the lifting mechanism is connected with the outer trough plate and the inner moving part, and when the inner moving part slides relative to the outer trough plate, the lifting mechanism enables the outer trough plate to ascend or descend; the wrench assembly comprises a rotating part, the rotating part is hinged to the outer groove plate and is in transmission connection with the inner moving part, and when the rotating part rotates, the rotating part drives the inner moving part to slide relative to the outer groove plate; the handle part is hinged to the rotating part through a first hinge point; the locking mechanism is used for enabling the handle part and the rotating part to rotate synchronously. According to the utility model, one part of the longer wrench assembly is folded, so that the storage, the packaging and the transportation are facilitated. The utility model also avoids the inconvenience that all the wrench assemblies need to be reassembled when the movable bracket is used.

The present application relates to the field of outdoor folding tables. Disclosed are a linkage folding support assembly, a folding frame and a folding table. The support assembly comprises side table plates and two support leg assemblies, wherein each support leg assembly comprises a bottom frame, support legs, sliding members and inclined support rods; each support leg is provided with a first hinge point and a second hinge point, and one of the two hinge points is located on the sliding member; fourth hinge points are provided in the middle of the bottom frame; the bottom frames of the two support leg assemblies are hinged to each other, at least one of the two support leg assemblies is provided with a side table plate, and the side table plate is provided with third hinge points; each support leg assembly further comprises support strips, the support strips are hinged to the side table plate at the third hinge points, one party of the support strips and the side table plate is hinged to one party of the bottom frame and the inclined support rods at the first hinge points, and the other party of the support strips and the side table plate is hinged to the other party of the bottom frame and the inclined support rods at the second hinge points; and the inclined support rods are hinged to the bottom frame at the fourth hinge points. The linkage folding support assembly has the advantages of being quick to disassemble and assemble and improving the usage experience of a user.

The utility model relates to the technical field of carts, and specifically to a flat-folding cart, comprising two vertical frames arranged opposite to each other and two side frames arranged opposite to each other, the two vertical frames and the two side frames together form a frame, and a bottom frame is provided at the bottom of the frame; the side frames include two folding frames, and the folding frames include connecting rods, struts and pull rods; one end of the connecting rod is hinged to the vertical frame and forms a first hinge point; the connecting rod is provided with a sliding member that can slide along the length direction of the connecting rod, and a positioning member that limits the maximum downward sliding position of the sliding member; one end of the strut is hinged to the sliding sleeve, and the other end is hinged to the vertical frame to form a second hinge point; one end of the pull rod is hinged to the sliding sleeve, and the other end is hinged to the bottom frame; in the same side frame, the ends of the two connecting rods away from the vertical frame are hinged; in this scheme, the height of the cart in the folded state will not increase compared with the height in the unfolded state, which is conducive to packaging or storing the folded cart.

The invention relates to a cabin door connecting rod mechanism, a cabin door assembly, an unmanned aerial vehicle garage and a vehicle, the cabin door connecting rod mechanism is used for opening and closing a cabin door installed on the unmanned aerial vehicle garage, and the cabin door connecting rod mechanism comprises a first connecting rod and a second connecting rod, the base is suitable for being rotationally connected to the base of the unmanned aerial vehicle garage through a second hinge point F; the second connecting rod is suitable for being rotationally connected to the first connecting rod through a third hinge point C; the third connecting rod is suitable for being rotationally connected to the cabin door through a fourth hinge point B and is suitable for being rotationally connected to the base through a fifth hinge point G; wherein a first virtual connecting line AF is defined as a virtual line segment connected between the first hinge point A and the second hinge point F, and the orthographic projection of the third hinge point C on the first virtual connecting line is located between the midpoint M of the first virtual connecting line and the second hinge point F.

The utility model belongs to the technical field of agricultural machinery assembly auxiliary equipment, and particularly relates to a roller welding device which comprises a machine frame and a middle frame, the middle frame is installed on the machine frame in a sliding mode, an upper layer frame is hinged to the middle frame, at least two sets of clamping units are arranged on the upper layer frame, and the clamping units are connected with the middle frame. The clamping unit comprises clamping mechanisms which are oppositely arranged, and the clamping mechanisms jointly clamp the roller ring. The middle frame is installed on the machine frame in a sliding mode, translation carrying before and after roller welding is achieved, the upper-layer frame is installed on the middle frame in a hinged mode, unloading after roller welding is achieved through overturning of the upper-layer frame around the hinged point, manual carrying is not needed, and the labor intensity of workers is greatly reduced. The roller ring is clamped during welding through the oppositely-arranged clamping mechanisms, the stability of the roller ring during welding is guaranteed, and therefore the welding quality is guaranteed.

The utility model discloses a lifting type connection table which comprises a table body, a lifting mechanism and two connection assemblies arranged on the table body. Wherein one connection assembly is fixedly installed on the table body, the other connection assembly is hinged to the table body, the lifting mechanism is installed on the table body, and the output end of the lifting mechanism is connected with the connection assembly hinged to the table body and can drive the connection assembly to rotate with the hinge point as the center. According to the utility model, through the lifting mechanism and the lifting of one connection assembly, the connection requirements of different heights and angles are met; automatic lifting is achieved through an air cylinder or hydraulic cylinder driving mode, manual intervention is reduced, and the operation efficiency is improved. The distance adjusting assembly is adopted in the connection assembly, accurate adjustment is achieved in a ball screw motor mode, and the conveying requirements of different sizes are met.

The invention relates to the field of workpiece positioning, and discloses a positioning mechanism for automobile part machining and welding, which comprises a working platform and a plurality of adjustable limiting and clamping mechanisms detachably connected to the working platform, the adjustable limiting clamping mechanism comprises a lower supporting mechanism detachably connected to the working platform, two hinge point adjusting mechanisms symmetrically connected to the lower supporting mechanism, a torque adjusting mechanism fixedly connected to the hinge point adjusting mechanisms and an upper pressing mechanism arranged over the lower supporting mechanism. The lower supporting mechanism and the upper pressing mechanism are hinged through the hinge point adjusting mechanism. The hinge point of the clamp type clamp can be automatically adjusted, the position and the opening and closing state of the hinge area of the clamp type clamp can be adjusted on the premise that the clamp type clamp can stably clamp a workpiece, and therefore the clamp type clamp can adapt to the process that a welding mechanical arm surrounds the workpiece to conduct continuous welding; and the welding manipulator cannot be blocked in the continuous surrounding process, the cost is low, and the economic benefit is high.

The utility model discloses a bead feeding mechanism capable of clamping and feeding various embroidery beads, which comprises a base and a bead pulley, and the bead feeding pulley is provided with an elastic bead feeding clamp capable of advancing to a bead embroidering position or retreating to a bead receiving position under the driving of the bead feeding pulley. The front end of the elastic bead feeding clamp is provided with a jaw which can be folded or unfolded under the combined action of friction force between the bead feeding pulley and the base and friction force between the elastic bead feeding clamp and the base, the bead feeding mechanism capable of clamping and feeding various embroidery beads further comprises a bead guide block, and the bead guide block is located above the elastic bead feeding clamp and hinged to the base. A front bead guide hole and a rear bead guide hole are formed in the bead guide block, the base is provided with a driving mechanism which drives the bead guide block to rotate with the hinge point as the axis so as to switch the positions of the front bead guide hole and the rear bead guide hole, and when the elastic bead feeding clamp retreats to the bead receiving position, the jaw is opened and aligned with the front bead guide hole or the rear bead guide hole. And a bead blocking plate is arranged between the bead guide block and the elastic bead feeding clamp. The utility model has the advantages of simple structure, smaller stroke, higher speed and better stability.

The utility model provides a three-head down-pressing training device which comprises a machine frame, an adjusting pull rod, a seat plate installed on the machine frame and two swing arms hinged to the machine frame respectively, the two swing arms are located on the two sides of the seat plate respectively, a handle is arranged at the end, close to the seat plate, of each swing arm, the other end of each swing arm is hinged to an adjusting arm, and the adjusting pull rod is arranged on the adjusting arm. A barbell shaft is fixed to the adjusting arm, and the hinged point of the swing arm and the rack is located between the adjusting arm and the handle. One end of the adjusting pull rod is hinged to the rack, and the other end of the adjusting pull rod is hinged to the adjusting arm. The swing arm, the adjusting arm and the adjusting pull rod form a force arm adjusting mechanism, and the length of a force arm can be changed along with the action change of a trainer, so that the trainer can press down and start more easily, and meanwhile, the load is ensured to meet the training requirement.

The invention provides an arm support device and engineering machinery, and the arm support device comprises an arm support structure with a first end hinged to a first hinge point of a rotary table; the first end of the variable-amplitude oil cylinder is hinged to the second hinge point of the rotary table, and the second end of the variable-amplitude oil cylinder is hinged to the third hinge point of the arm support structure; the first end of the auxiliary oil cylinder is hinged to a fourth hinge point of the rotary table, the second end of the auxiliary oil cylinder is hinged to a fifth hinge point of the arm support structure, the variable-amplitude oil cylinder and the auxiliary oil cylinder are used for synchronously driving the arm support structure to rise an arm, the fourth hinge point is located between the first hinge point and the second end of the arm support structure, and the fourth hinge point is arranged close to the first hinge point. According to the cantilever crane device, the variable-amplitude oil cylinder and the auxiliary oil cylinder are installed on the rotary table, the variable-amplitude oil cylinder and the auxiliary oil cylinder are supported through the rotary table, the variable-amplitude oil cylinder and the auxiliary oil cylinder are matched to jointly conduct arm lifting driving on the cantilever crane structure, insufficient arm lifting thrust is avoided, and meanwhile the supporting strength can be ensured; and the safety and the reliability of arm lifting of the arm support structure are ensured.

The utility model relates to a rapid clamping device and a boring machine, and belongs to the technical field of machining. The quick clamping device comprises a base, a connecting rod, a pressing plate, a rotating block and a screw, one end of the connecting rod is hinged to the pressing plate, the other end of the connecting rod is hinged to the base, the hinge point of the connecting rod and the pressing plate is a rotating fulcrum of the pressing plate, a threaded hole is formed in the base, a U-shaped groove is formed in the rear end of the pressing plate, and the two ends of the rotating block are in pin joint to the two side walls of the U-shaped groove. The threaded rod penetrates through the rotating block and is in threaded connection with the interior of the threaded hole, a check ring is fixed to the threaded rod and located below the rotating block, and when the threaded rod moves upwards, the rear end of the pressing plate is jacked up by the check ring. The boring machine comprises the rapid clamping device. According to the utility model, the pressing plate is rotated by rotating the screw rod, and a workpiece is clamped by utilizing the lever principle, so that the clamping process is simplified; the boring machine can clamp two workpieces at the same time, the boring machining efficiency is improved, the downtime of equipment is shortened, and the labor intensity of workers is relieved.

The invention relates to the technical field of track vibration reduction, in particular to a vibration isolation track based on multiple negative stiffness mechanisms, which comprises a floating slab track bed and a railway track arranged on the top surface of the track bed, two symmetrical vertical rigidity variable vibration isolation supports are arranged at the bottom of the floating slab ballast bed; the vertical rigidity variable type vibration isolation support comprises an outer sleeve, an inner sleeve with a clamping opening, a belleville spring, a steel spring and a shaft rod. A motorized negative stiffness hinge mechanism is arranged in the center of the bottom of the ballast bed; the motorized negative stiffness hinge mechanism is formed by hinging a plurality of connecting rod pieces through a plurality of hinge points; elastic buffer assemblies are symmetrically arranged on the side edges of the ballast bed; the elastic buffer assembly is arranged between the ballast bed and the inner wall of the tunnel; and the elastic buffer assembly comprises an inclined pre-bent steel plate, an inclined pre-tensioning steel spring and a horizontal pre-pressing steel spring, so that the whole ballast bed has a relatively large negative stiffness effect, the natural vibration frequency of the whole system is further reduced, and a very obvious vibration isolation effect is provided.

The present application discloses a cabinet assembly and a refrigeration device, wherein the cabinet assembly includes a door body, a cabinet and a hinge assembly, wherein the second hinge point is arranged away from the outer edge of the door body compared to the first hinge point, and a first angle and a second angle are respectively formed between the first hinge point and the first reference plane in a first movement direction relative to the cabinet, the second hinge point and the second movement direction relative to the cabinet, and during the process of the door body opening from a closed state to a first opening angle, the difference between the second angle and the first angle at the same actual opening angle of the door body relative to the cabinet gradually increases to offset the increase of the projection line of the line connecting the second hinge point and the outer edge on the first reference plane, and the increase of the projection line of the line connecting the second hinge point and the inner edge on the second reference plane, thereby reducing the problem of squeezing the cabinet and exceeding the side of the cabinet assembly when the door body is opened.

The invention provides a door-shaped support for a large truss type landing gear, and belongs to the technical field of aircraft landing gear, the door-shaped support comprises a door-shaped support body, the lower side of the door-shaped support body is provided with an opening, and the opening is used for forming a motion space of a buffer installed on a landing gear supporting column; wherein a first connecting lug is arranged on the upper side of an opening of the door-shaped support, a rear set of undercarriage supporting columns are supported through the first connecting lug, a second connecting lug is arranged at the corner of the opening of the door-shaped support, connection between the door-shaped support and an airframe structure is achieved through the second connecting lug, and wide double lugs are formed on the two sides of the opening of the door-shaped support. The wide double-lug piece is installed at the hinge point position of the undercarriage supporting column and the rocker arm and is connected with the undercarriage supporting column and the rocker arm through the same connecting shaft.