1005 results about "Hinge point" patented technology

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.

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 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 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 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 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 relates to the technical field of valves, and discloses a rectangular valve and a self-locking type opening and closing device thereof.The rectangular valve comprises a mounting frame and a driving part, the mounting frame is fixedly connected with the driving part, a connecting rod is fixedly connected to an output shaft of the driving part, and the two ends of the connecting rod are each sequentially hinged to a first hinge rod, a second hinge rod and a valve rod; one end of the first hinge rod is hinged to the connecting rod, the other end of the first hinge rod is hinged to one end of the second hinge rod, a roller is rotationally connected to the hinge point, the other end of the second hinge rod is hinged to one end of the valve rod, the other end of the valve rod penetrates through the mounting frame, and guide rails matched with the roller in a self-locking mode are arranged on the two sides of the mounting frame. The first hinge rod and the connecting rod are located on the same horizontal straight line, and the first hinge rod is perpendicular to the second hinge rod. The connecting rod and the first hinge rod form a straight line, so that the roller is limited in the clamping groove, the roller is locked, and then the valve element is locked at the sealing position.

The utility model relates to a pull rod locking structure on a folding shopping cart. The pull rod locking structure comprises a shopping cart box body and a pull rod assembly arranged on a shopping cart body. A rear box plate of the shopping cart box body is provided with a pull rod groove. The pull rod assembly is hinged to the lower portion of the pull rod groove. A locking assembly is arranged on the pull rod assembly, and a locking seat is arranged in the pull rod groove; when the pull rod assembly rotates along the hinge point to be embedded into the pull rod groove, the output end of the locking assembly is clamped into the locking seat, and the pull rod assembly is limited in the pull rod groove. The locking device is characterized in that the locking assembly comprises a buckle plate arranged on the pull rod assembly in a longitudinal moving mode, a spring bolt fixed to the buckle plate and an elastic component used for driving the buckle plate and the spring bolt to stretch out and reset; when the buckle plate longitudinally moves relative to the pull rod assembly, the lock tongue can be driven to advance and retreat relative to the locking base, and clamping locking or separation unlocking of the lock tongue and the locking base is achieved. The scheme has the advantages of simplified structure, convenience in operation and high locking stability.

A telescopic joint suitable for a novel magnetic levitation track comprises main crown rails, auxiliary crown rails and an equipartition connecting rod mechanism, the main crown rails are fixed below flange plates on the two sides of a T-shaped track beam joint, and the auxiliary crown rails are arranged between the main crown rails; a transverse slide way and two longitudinal slide ways are arranged in the middle of the top face of the auxiliary crown rail, and the two longitudinal slide ways are symmetrically distributed on the two sides of the transverse slide way. The equally-divided connecting rod mechanism is a four-connecting-rod mechanism and is arranged on the top of the auxiliary crown rail, hinge points of the four-connecting-rod mechanism are correspondingly connected with the sliding ways in a sliding mode, and the two ends of the four-connecting-rod mechanism are hinged to the top of the front main crown rail and the top of the rear main crown rail respectively. When the main crown rail stretches and retracts along with the T-shaped rail beam, the auxiliary crown rail is driven to move through the equipartition connecting rod mechanism, and gaps between the front end and the rear end of the auxiliary crown rail and the main crown rail are always kept equal. Interference with an electromagnetic module below the bogie of the maglev train can be avoided, and it can be guaranteed that front and rear telescopic gaps of the connector are equal.

The invention relates to the technical field of athletic equipment, and specifically to a trigger mechanism for crossbow. It comprises a bracket, a trigger system assembled on the bracket and a bow string; said string locking safety device comprises a sear, a sear connecting rod, a sear toggle lever, a trigger connecting rod and a safety button. In the whole attaching string and firing process of the trigger mechanism described in the invention, each hinged point is in pivoting friction contact in a full cycle manner, the contact surface of each hinged point does not change, and the pressure ratio of each contact surface doesn't increase significantly, and an increase in pressure ratio of the contact surface will not occur due to the friction contact surface decrease along with firing; there is no accelerated wear and tear of various moving parts and the service life is long.

A positive pressure chock system has a first arm with a first wheel chock and a second arm with a second wheel chock. The first wheel chock is attached at a bottom end of the first arm and the second wheel chock is positioned at a bottom end of the second arm. The first arm and the second arm are attached at a hinge point such that the first wheel chock and the second wheel chock are movable between an open position where the first wheel chock and the second wheel chock move away from each other and a closed position in which the first wheel chock is biased towards the second wheel chock.

The feeding mechanism comprises a conveying mechanism, and a material guiding mechanism, a feeding channel and a workpiece pushing-out mechanism are sequentially arranged on the conveying mechanism in the part conveying direction. The guide mechanism comprises a guide plate which is obliquely arranged and a protective plate which linearly extends in the conveying direction, the guide plate is fixedly connected with one side of a rack of the conveying mechanism through a supporting frame, and the small end of a guide opening is communicated with the feeding channel; a pushing mechanism is arranged at the position, close to the feeding channel, of the guide plate and comprises a pushing plate, a hinge point is arranged at one end of the pushing plate, and the pushing plate is rotationally connected with the supporting frame through the hinge point. Meanwhile, the push plate is connected with a driving unit, and the driving unit drives the push plate to rotate around a hinge point; a stroke stop block is fixedly arranged on the protective plate and corresponds to the material pushing mechanism in position. The small piston part feeding device is simple in structure, efficient and low in cost, solves the problem that materials are accumulated and clamped on site, and meets the requirement for automatic feeding of small piston parts on a production site.

The present invention discloses a space deployable unit and a large-scale deployable platform. The space deployable unit is a symmetrical multi-closed loop mechanism, including a first platform, a second platform, and a plurality of planar 4R branches connected to the first platform and the second platform; the planar 4R branch has a first connecting rod, a second connecting rod and a third connecting rod, one end of the first connecting rod is connected to the first platform through a first hinge point, the other end of the first connecting rod is connected to the second connecting rod through a second hinge point, one end of the third connecting rod is hinged to the second connecting rod through a third hinge point, and the other end of the third connecting rod is connected to the second platform through a fourth hinge point; wherein the rotation axes of the revolving pairs formed at the first hinge point, the second hinge point, the third hinge point and the fourth hinge point are parallel to each other; the second connecting rods in adjacent planar 4R branches are connected by two symmetrically distributed planar 3R branches. The present invention has the advantages of good symmetry, high rigidity, light weight, structural stability and high reliability.

The technical scheme belongs to the technical field of reclining chairs, and particularly relates to a stably adjustable folding reclining chair which comprises a seat body, supporting legs movably arranged on the two opposite sides of the seat body and armrest parts, the seat body comprises a seat part and a chair back part, the chair back part is hinged to the rear side of the seat part to form a hinge point, and a positioning structure is arranged between the seat body and the supporting legs. The positioning structure comprises a clamping part arranged on the rear side of the supporting leg and a clamping and embedding part arranged on the base body, the clamping and embedding part and the hinge point are coaxially arranged, the clamping part is provided with a positioning groove for the clamping part to be embedded and matched, and the clamping part abuts against the side wall of the positioning groove to limit overturning of the base body and the supporting leg. The seat body is matched with the supporting legs to be folded; the pressure applied by the sitting posture of a human body abuts against the side walls of the positioning grooves through the clamping parts on the two sides and is transmitted to the supporting legs provided with the clamping and embedding parts, stable supporting is formed, the seat body and the supporting legs cannot be driven to be folded when the chair back part is adjusted, and the using stability of the deck chair is improved.

The utility model discloses a foldable baby carriage which comprises a bottom frame, a folding mechanism and a folding mechanism. Wheels used for supporting the baby carriage to walk are mounted on the bottom frame; the push handle rod comprises a telescopic rod body and a connecting base hinged to the bottom of the rod body, the connecting base is installed on the bottom frame in a sliding mode, first sliding locking mechanisms which are matched with each other are arranged between the bottom of the rod body and the bottom frame, and the first sliding locking mechanisms and stretching and retracting of the rod body are unlocked in a linkage mode; the inclined supporting rod is connected with the pushing handle rod through a first hinge point, the inclined supporting rod and the pushing handle rod form a retainer, and the bottom of the inclined supporting rod is connected to the bottom frame through a second hinge point; the seat is connected to the push handle rod through a third hinge point, the top of the inclined supporting rod is installed on the seat in a sliding mode, when the baby carriage is folded, the seat is close to the bottom frame, and the retainer deforms correspondingly. The folding mode of the baby carriage is improved, and a linkage unlocking mode is adopted, so that use is more convenient.

The invention relates to the technical field of well repairing equipment, in particular to a connecting rod mechanism and a pipe rod transferring mechanical arm. The connecting rod mechanism comprises a vertical frame, a first connecting rod, a second connecting rod and a third connecting rod; the right end of the first connecting rod and the upper end of the second connecting rod are hinged to form a second hinge point, the lower end of the second connecting rod and the right end of the third connecting rod are hinged to form a third hinge point, and the left end of the third connecting rod and the vertical frame are hinged to form a fourth hinge point. The device is reasonable in structure and ingenious in design, the purpose of converting the angle of the pipe rod gripper is achieved through the connecting rod mechanism, the purpose of controlling the inclination angle of a pipe rod in the pipe rod lifting operation is achieved through the pipe rod transferring mechanical arm, and a hardware foundation is provided for automatic operation of transferring the pipe rod between a wellhead and a catwalk machine.

The invention discloses an adjustable wall-mounted basketball stand. The adjustable wall-mounted basketball stand comprises a backboard, a fixing frame, a first connecting assembly and a second connecting assembly, wherein the first connecting assembly and the second connecting assembly are hinged to the backboard and the fixing frame respectively; the device further comprises an adjusting mechanism, the adjusting mechanism comprises a first adjusting piece and a second adjusting piece, the first adjusting piece is fixedly connected with the first connecting assembly, the second adjusting piece is rotationally connected with the fixing frame through two rotating shafts, and the first adjusting piece and the second adjusting piece can keep the relative position fixed so as to limit rotation of the first connecting assembly and the second connecting assembly. The first adjusting piece and the second adjusting piece can get close to each other or get away from each other so as to drive the first connecting assembly and the second connecting assembly to rotate and drive the backboard to ascend or descend. The two rotating shafts are matched with the fixing frame to form a triangular supporting structure, that is, the first hinge point is located at the end point of a triangle, and the two rotating shafts and the fixing frame play a role in stably supporting the second adjusting piece together.

This invention discloses a built-in hinge for a high-load-bearing, high-safety outward-opening window and a method for installing the window sash. The built-in hinge includes a slide rail, a slider, a long rod, a middle rod, a short rod, and a support arm. One end of the long rod is hinged to the slide rail, and one end of the middle rod and one end of the short rod are slidably connected to the slide rail. The middle rod and the short rod are cross-hinged. The other end of the middle rod is connected to the long rod, and the other ends of the short rod and the long rod are connected to the support arm. The hinge points A and B between the middle rod and the long and short rods, and the hinge points C and D between the support arm and the short and long rods, form a quadrilateral ABCD. The connection point on the support arm that fixes the window sash is eccentrically inward towards the line connecting the hinge points CD. During the opening and closing process of the hinge of this invention, the gap between the frame and sash profiles is reduced from the conventional 7mm or more to 4mm, preventing collision between the window sash profile and the window frame profile. This shortens the distance between the two profiles, improving the aesthetics of the window while also enhancing the overall thermal insulation, sealing, and safety of the window.

The invention relates to the technical field of welding tools, and discloses a 4200-level box bottom longitudinal seam friction stir welding tool which comprises a tool base, a rotary table base is arranged at the top of the tool base, a rotating mechanism is arranged at the lower end of the rotary table base, and a rotary table upper pedestal is rotationally connected to the top of the rotary table base; the top of the rotary table base is fixedly connected with a circular ring mold, the surface of the circular ring mold is fixedly connected with a fixing block, and an elastic steel belt is arranged on the surface of the circular ring mold. According to the friction welding device, the output end of the air cylinder pushes the swing rod to move downwards, so that the pressing block fixes a scalloped segment workpiece to the surface of the circular ring mold, the scalloped segment workpiece is prevented from moving in the friction welding process, and the welding effect and quality are guaranteed; and the longitudinal seam pressing arm rotates around the hinge point of the pressing arm seat, so that the welded scalloped segment workpiece can be conveniently taken down subsequently.

The utility model discloses a tensioning device, an air conditioner compressor transmission system and engineering machinery, the upper part of a rotating bracket is hinged with the upper part of a fixed bracket, and the rotating bracket can rotate around a hinge point; the right-hand thread knuckle bearing connecting rod comprises a rod part and a bearing part, and the bearing part is hinged to the lower end of the rotating support. The left-hand thread knuckle bearing connecting rod comprises a rod part and a bearing part, and the bearing part is hinged to the lower end of the fixing support; one end of the positive and negative thread adjusting long nut is in threaded connection with the rod part of the positive thread joint bearing connecting rod, the other end of the positive and negative thread adjusting long nut is in threaded connection with the rod part of the negative thread joint bearing connecting rod, and the positive and negative thread adjusting long nut is rotated in the positive or negative direction to enable the positive and negative thread joint bearing connecting rods to move in the opposite direction or back direction; and then the rotary support is driven to rotate towards or away from the fixed support, and the problem that the tensioning efficiency is low is solved.

The utility model belongs to the technical field of electric power engineering, especially relate to a support for replacing insulator, including joint plate, support rod, frame and first extension rod etc., two joint plates are in parallel distribution and are slidably arranged on the frame, and the support rods distributed on the same side are a group, and there are two groups in total, and each support rod is fixedly connected on each joint plate, and each first extension rod is slidably arranged between every two support rods in longitudinal alignment. Through setting the position adjustable joint plate and the length adjustable support rod, can flexible adaptation different length's insulator, and with the help of the clamping mechanism that clamping rod, torsional spring and rotating frame constitute, only need to place the insulator between two joint plates, utilize its own weight can trigger clamping rod around rotating frame hinge point positive rotation, make originally low clamping rod positive rotation to high place, complete the clamping fixation to insulator, do not need extra tool and complex operation, realize installation automation convenient, and it is convenient for later quick replacement, simplifies the process.

The utility model relates to the technical field of building doors and windows, and particularly discloses a horizontal sliding hinge structure and a horizontal sliding window. The horizontal pushing hinge structure comprises a cross link rod and a lock rod, the cross link rod can stretch out and draw back in the x-axis direction and the y-axis direction. A plurality of first hinge points and a plurality of second hinge points are arranged at the two ends, in the x-axis direction, of the cross connecting rod correspondingly. The lock rod is arranged in the z-axis direction of the first hinge point; the lock rod and the first hinge point can slide relatively in the y-axis direction. According to the scheme, the first hinge point and the lock rod are overlapped in the z-axis direction, so that the first hinge point and the lock rod can be arranged in the same rail on the horizontal sliding window provided with the horizontal sliding hinge structure; meanwhile, as the lock rod can slide relative to the lock rod in the y-axis direction, control over the lock rod cannot interfere with operation of the cross link rod, the horizontal sliding window with the horizontal sliding hinge structure can have a more compact structure, and the problem that an existing horizontal sliding window is poor in compactness is effectively solved.

A handheld assembly tool for interference press fitting of a small plug-in and a small socket comprises an installation support, a cam, a pressing head, an adjustable supporting rod, a handle, a pressing rod and a spring. The cam is provided with a front end part and a tail part, the front end part is hinged to the cam connecting part, the tail part is connected with a pressing rod, and the cam can rotate around a hinge point; the upper end of the pressure head is in contact with the cam, and the lower end of the pressure head abuts against the small plug-in; the spring is assembled between the pressure head and the mounting support; the adjustable supporting rod is in threaded connection with the lower end of the mounting support; the handle is fixed on the handle connecting part; an anti-disengagement check ring is further arranged, a pair of L-shaped sliding grooves are formed in the anti-disengagement check ring, and a pair of clamping heads are arranged on the pressing head. The interference press-fitting device has the advantages that interference press-fitting can be accurately controlled under the condition that no external power exists, and the yield reaches 98%; 2, the weight of the tool is only 0.68 kg, the operation is convenient, and the assembly efficiency is improved by 50%; 3, compatibility is good, the device is suitable for multi-model assembly parts, and rapid switching of the assembly parts of different models can be completed within 60 seconds. And 4, the manufacturing cost is low.

According to the box body assembly and the refrigeration equipment, a reference point of a door body coincides with one, farthest from a second reference plane, of the starting position and the ending position of a first hinge point, and in the process that the door body is opened to a first opening angle from a closed state, the door body is closed; a first vertical distance from the reference point to the outer edge and a second vertical distance from the reference point to the inner edge are gradually reduced, a third included angle between the first vertical line and the first reference plane is gradually reduced in a range of 0-90 degrees, and a fourth included angle between the second vertical line and the first reference plane is gradually increased; in the process that the door body is opened from the first opening angle to the second opening angle, the first vertical distance is gradually decreased, the third included angle is gradually decreased in the range of 0-90 degrees, the fourth included angle is gradually increased from smaller than 90 degrees to larger than 90 degrees, the second vertical distance is gradually decreased and then gradually increased, and in the preset angle range before the second opening angle, the first vertical distance is gradually decreased, and then the second vertical distance is gradually increased. The sine value of the fourth included angle is reduced while the second vertical distance is increased.

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.

The foldable ladder comprises a basic ladder, an upper foldable ladder body and a lower foldable ladder body, the upper foldable ladder body and the lower foldable ladder body are hinged to the upper end and the lower end of the basic ladder, and the upper foldable ladder body and the lower foldable ladder body are attached to the front side face of the basic ladder after being overturned around the hinge points of the upper foldable ladder body and the lower foldable ladder body; after the upper folding ladder and the lower folding ladder are unfolded on the basic ladder and are flush with the basic ladder, the positions of the upper folding ladder and the lower folding ladder are fixed at the hinged position of the upper folding ladder and the basic ladder and the hinged position of the lower folding ladder and the basic ladder through at least one anti-overturning component respectively. The storable folding ladder can be stored in a toolbox in the longitudinal beam after being folded, can meet the height requirement for getting on and off the vehicle after being unfolded, and has high practicability.

The utility model discloses a ring piece rapid roundness correction device which comprises a base, a first round rod arranged on the base, a first sliding sleeve sleeved on the first round rod, a height adjusting mechanism arranged on the first sliding sleeve, a second sliding sleeve fixed on one side of the first sliding sleeve, a second round rod arranged in the second sliding sleeve in a penetrating mode, and a third sliding sleeve sleeved on the other end of the second round rod. A fourth sliding sleeve is fixed to one side of the third sliding sleeve, the lower end of a third round rod penetrates into the fourth sliding sleeve, a transverse sleeve is fixed to the top end of the third round rod, the rear end of a fourth round rod penetrates into the transverse sleeve, a laser base is hinged to the front end of the fourth round rod, and the laser base and the fourth round rod can be fixed after a screw on a hinge point of the laser base is tightened. And a large circular ring laser is fixed on the laser seat. The rapid roundness correction device for the ring piece can project a standard large circular ring, and can match the large circular ring to the inner ring and the outer ring of the ring piece by adjusting the height and the position of the large circular ring laser, so that the roundness of the ring piece can be rapidly corrected by referring to the standard large circular ring.