131 results about "Upward displacement" patented technology

The invention provides a wafer back surface and edge detection device which comprises a base, and a rotary lifting module, a clamping lifting module, a motion direction conversion module and a visual detection module which are mounted on the base, the rotary lifting module comprises a rotary mechanism and a lifting mechanism; a supporting part for placing a wafer is arranged in the lifting mechanism, and the lifting mechanism is configured to jack the wafer up / down to a working position; the rotating mechanism is configured to provide a circumferential direction movement trend for the movement direction conversion module; the motion direction conversion module is arranged above the rotary lifting module and the clamping lifting module, and is driven by the clamping lifting module to realize displacement in the vertical direction, and the lifting motion of the clamping lifting module is converted into radial displacement of the motion direction conversion module; and the visual detection module comprises a camera unit, the camera unit faces the wafer, and the visual detection module is configured to perform image acquisition and detection on the wafer.

The application discloses a continuous evaporator and a working method thereof, relates to the technical field of evaporators, and comprises a primary evaporator, a body, an auxiliary component and a matching component, the primary evaporator is communicated with the body through a conveying pipe, a heater is arranged on the primary evaporator, a fixed plate is fixedly connected to the inner wall of the body, a base is fixedly connected to the bottom surface of the body, the auxiliary component is arranged in the body and comprises four auxiliary blocks, intermittent vibration of the four auxiliary blocks is generated through the arrangement of the auxiliary component, the matching component is drivingly connected to the auxiliary component and comprises a displacement plate slidingly connected to the inner wall of the body, the displacement plate is reciprocatingly displaced in the vertical direction and has the features of slow upward displacement and rapid downward displacement through the arrangement of the matching component, and the auxiliary component comprises a main shaft; through mutual cooperation between the above-mentioned structures, the application has the effects of improving overall evaporation efficiency, shortening the time required for boiling of the secondary evaporator and reducing the energy consumption demand.

The invention discloses a high-adaptability elevator car body welding jig which is applied to the related technical field of welding jigs and can simplify the dismounting and mounting process of a limiting assembly, so that the mounting position of the limiting assembly can be quickly changed according to the size and shape of an elevator car part needing to be welded, and the welding efficiency is improved. The problem that in the prior art, a welding jig is difficult to adapt to welding of different parts of lift cars of different sizes is solved, in the process of installing a limiting assembly, by rotating a pre-lifting cushion block, the end cushion block can be driven to move upwards through inclined face matching between a lifting piece and the end cushion block, tight abutting between a jig platform and a bearing strip is achieved, and the welding quality is improved. Therefore, rapid locking of the limiting assembly is completed. Besides, in the welding process, the limiting stability of the limiting assembly on the lift car component can be monitored, so that abnormal deviation or looseness can be found in time, welding under the condition of unstable limiting is effectively avoided, the welding precision of the lift car is effectively guaranteed, and the defective rate is reduced.

The invention discloses a logistics transportation carrying device for large express delivery. The logistics transportation carrying device comprises a device body and a connecting assembly arranged on the device body. The abutting block pulled downwards moves downwards and moves to the bottom of the clamping block, the compressed limiting spring pushes the connected clamping block to move towards the inner side, upward deviation of the abutting block is limited, a connecting plate arranged on the outer wall of a fixing rod fixedly connected to the outer wall of the bearing plate in a sleeving mode is rotated, and an inserting block fixedly connected to the inner side of the connecting plate is driven to move; a compression spring connected to the outer wall of the fixing rod in a sleeving mode is further compressed, a rectangular block fixedly connected to the outer end of the limiting rod is provided with a limiting hole, the pulled insertion block is pushed inwards under the action of the compressed compression spring, the moving insertion block slides into a nickel coin in the limiting hole of the rectangular block, and a clamping block connected to the inner side of the limiting rod is limited. The supporting springs connected to the outer walls of the supporting rods in a sleeving mode are compressed in a high-strength mode, supported goods can have a great buffering effect, and large-amplitude collision is effectively avoided.

The utility model relates to the technical field of betel nut cleaning, and discloses a betel nut cleaning device which comprises a water tank, a lifting rod is fixedly connected to the side wall of the water tank, a top plate is arranged at the top of the lifting rod, a connecting piece is fixedly connected to the side wall of the top plate, and a net cage is fixedly connected to the bottom of the connecting piece. Then the loading groove can be pushed back into the net cage and locked through a sliding plate, then the lifting rod can retract, the net cage is immersed into the water tank, the betel nuts are immersed into water at the moment, then the lifting rod stretches to make the net cage move upwards, then the betel nuts are fished out of the water surface, and then the lifting rod continues to stretch out and draw back; according to the betel nut washing device, betel nuts are repeatedly soaked in water and then fished out of water, so that the betel nuts can be repeatedly washed through water flow, the betel nuts can be conveniently washed, manpower is saved, the betel nuts can be conveniently washed, and the working intensity of workers is reduced.

The utility model discloses a full -automatic static pressure molding machine belongs to static pressure molding machine field, including static pressure molding machine, one side fixed connection of static pressure molding machine has the support frame, the upper surface fixed connection of support frame has the casing, both sides inner wall of casing all are established and have placed the groove, the inner chamber bottom fixed mounting of placed groove has electric push rod, the output fixed connection of electric push rod has the limit frame, the inner chamber of casing is provided with modeling mould, and both sides of the bottom of modeling mould all are fixedly connected with the limit block, through the cooperation of above -mentioned each device, modeling mould carries out quick disassembly and installation, and the limit frame and limit block are driven to the upward displacement through electric push rod to the ejection of modeling mould is driven, and the replacement time of mould is shortened, and the manpower and material resources of reduction are input, and the work efficiency of personnel is improved.

The utility model relates to the technical field of crane detection, and discloses a safety detection device for a tower crane, which comprises an external frame, a compression seat is arranged in the external frame, a lower clamping piece moves upwards to be matched with an upper clamping piece to clamp a steel wire rope through extension of a telescopic rod I, and the steel wire rope is matched in the compression seat at the moment; when a driving motor runs, a roller rotates, then the whole detection device moves along the steel wire rope, and then a microcontroller controls a second telescopic column to stretch, so that a displacement plate drives a pressing seat to press the steel wire rope; meanwhile, the compression force borne by the steel wire rope is sensed by the pressure sensing assembly, data are transmitted to the microcontroller to be processed, and then the numerical value is read out through the loudspeaker, so that the tension data of the steel wire rope in the air or at the position where the detection device is inconvenient to install can be detected by utilizing the detection device capable of moving along the steel wire rope; and convenience in safety detection of the steel wire rope is improved.

This invention provides a structure for improving the vibration reduction performance of fixed frog turnouts, belonging to the field of track technology. It includes a wing rail and a frog vibration-damping metal component. A spacer is provided between the wing rails, and the frog vibration-damping metal component is located between the wing rails. Both sides of the frog vibration-damping metal component have outward protrusions. Multiple sets of limiting blocks are provided on the spacer. The outer side of the outward protrusions is consistent with the arc surface of one side of the wing rail, and one end of each set of limiting blocks is connected to the bottom of the outward protrusion. This invention solves the technical problem of upward force generated at both ends of the vibration-damping device under train load, leading to upward displacement and adversely affecting the wheel flanges. It achieves the technical effect of limiting the upward displacement of the vibration-damping device, improving system stability, and not affecting the compression deformation of the elastic material and the vibration reduction performance.

The utility model relates to connector technical field especially relates to a plug shell, connector shell and connector, plug shell subassembly includes plug shell, shield, first locking structure and second locking structure, the plug shell is equipped with first insertion end face in one side along its insertion direction, be equipped with the insertion part of protruding in first insertion end face on first insertion end face, the shield is annular, the shield fixedly covers and sets in the outer peripheral surface of insertion part, first locking structure links with shield, second locking structure links with insertion part, first locking structure with second locking structure lock, to limit shield displacement along insertion direction of plug shell. Avoid the shield from the insertion part and separate when the plug shell and the socket are inserted, improved the connection stability between shield and insertion part.

The present application belongs to the technical field of rocking table lock tank, and particularly relates to a lock tank device suitable for a supporting tank rocking table, comprising: a base; a rocking table main body rotatably arranged on the top of the base through a rotating piece, both sides of the top of the rocking table main body are provided with rocking arms for supporting a tank cage; a lock block slidingly arranged on the bottom of the rocking table main body through a guide piece, one end of the bottom of the rocking table main body is provided with a lock tank oil cylinder for driving the lock block to move; two release oil cylinders arranged at both ends of the bottom of the inner cavity of the base, the driving end of each release oil cylinder is provided with a limiting sliding block; compared with the prior art, the upward force is dispersed to the whole base through the limiting sliding blocks abutting against both sides of the lock block, active receiving and dispersion of the upward force are realized, the passive force releasing mode of the prior art is replaced, upward displacement of the tank cage when sudden force is applied is avoided, use safety is improved, upward impact force of the tank cage is effectively buffered, displacement of the tank cage is prevented, and safety hazards are eliminated.

The utility model discloses a hot -blast comb planting hair point oil device, it includes the plug -in part, rotation drive part and height adjusting spare, the plug -in part is used for inserting comb cylinder, the shape of plug -in part is with the shape of the inner ring of comb cylinder for inserting handle adaptation, rotation drive part is fixedly connected with plug -in part and drives plug -in part to rotate, height adjusting spare drives plug -in part to displace in vertical direction, thereby make the distance between the position of comb cylinder and oil rubber material disc opposite in the process of comb cylinder rotation all equal. The utility model has the effect of realizing high -efficient point oil through the mechanical drive of dipping oil.

The invention provides a pier sinking support springback displacement compensation device and a design method thereof, and relates to the technical field of pier sinking support springback displacement compensation. The method comprises the steps that the actual settlement displacement (d-h) of a bridge deck is obtained according to the upward displacement compensation amount h of the compensation device and the creep sinking amount d of a pier, calculating to obtain compensation device support loss force P according to the equivalent stiffness coefficient k1 of the upper structure, and further obtaining a sinking ratio P / P according to the compensation device support loss force P and preset original support loss force P; judging whether the sinking ratio P / P is smaller than a preset threshold value or not; if not, adjusting the total rigidity k3 of the spring, and returning to execute the step of acquiring the total rigidity k3 of the spring according to the adjusted total rigidity k3 of the spring until the sinking ratio P / P is smaller than the preset threshold value, and outputting device information of the compensation device to design the compensation device. The technical problems that in the prior art, a common rubber support cannot achieve rebound displacement automatic compensation and is prone to fatigue failure are solved.

The full-automatic flange plate machining device comprises a device body, a mounting bin and a limiting column, a plurality of movable cylinders are movably mounted in the limiting column, telescopic columns are movably mounted on the inner walls of the movable cylinders, and a plurality of limiting plates are movably mounted on the outer wall of the limiting column; a first linkage shaft is movably installed in the device body, and a one-way bearing is arranged at the center end of the first linkage shaft. According to the drilling device, the limiting columns and the limiting plates are arranged, the multiple sets of limiting plates are matched to fix the flange plate from the inner wall, and after drilling operation is completed at one end of the flange plate, the drilling device moves upwards to drive the limiting columns to rotate, so that the multiple sets of limiting plates are driven to rotate, and the drilling position of the flange plate is adjusted; and the other end of the flange plate is moved to the lower end of the drilling device, so that the convenience of adjusting the drilling area of the flange plate is improved, the machining efficiency of the flange plate is improved, and the workload of workers is reduced.

This utility model relates to the field of metal casting mold technology and discloses a mold that facilitates demolding. It includes a receiving groove with a vertical plate fixed to its side wall. After casting, the telescopic rod extends, causing the upper mold to move upwards and detach from the lower mold. Then, the upper top block can be pulled outwards from the bottom of the lower mold. At this point, power is stopped to the electromagnet, releasing the magnetic lock on the lower mold. The lower mold then rotates downwards under the support of the rotating shaft and support frame. The protective strip then collides with the collision strip. The opening of the lower mold faces downwards, allowing the formed material inside to be easily discharged downwards for demolding. Simultaneously, the material is subjected to centrifugal force during the rotation of the lower mold, further facilitating demolding. This solves the problem of common casting molds where the formed material is located inside the lower mold cavity, making demolding difficult and allowing for long-term use of the mold.

This marine vessel includes: a hull; a vehicle deck which is provided on the hull and on which it is possible to mount, side by side, a plurality of trailers of semi-trailers in a longitudinal direction of the trailer in a state in which a trailer support for supporting a front part of the trailer from below is attached; and an engagement part which is provided on the vehicle deck with which a twist lock provided at a lower end of the trailer support can be engaged by inserting the twist lock and rotating the same around an axis extending in the vertical direction. The engagement tool includes: a groove into which the twist lock located at a lock release position extending in the longitudinal direction of the trailer can be vertically inserted and removed; and a restricting part that, when the twist lock inserted into the groove is rotated and the twist lock is set to a lock position extending in a direction crossing the longitudinal direction of the trailer, abuts against the twist lock, thus restricting the upward displacement of the twist lock. A length of the groove is twice or more a length of the twist lock in the longitudinal direction.

The utility model discloses a connecting rod mechanism facilitating opening and closing of a safety cover plate of a wind driven generator, and relates to the technical field of wind driven generators. The device comprises a protective shell, the top of the protective shell is rotatably connected with a rotating shaft, and the circumferential surface of the rotating shaft is fixedly connected with a cover plate; a connecting rod opening and closing device is arranged in the protective shell and comprises a fixing block, and the fixing block is fixedly connected to the inner wall of the protective shell. The force for driving the rotating rod to rotate through the motor is matched with the positioning block, the fixed rod, the supporting rod and other components in the connecting rod opening and closing device, so that the rotating rod is driven to rotate through the rotation of the fixed rod, and the supporting rod is driven to rotate and move upwards through the rotation of the rotating rod; and the supporting rod moves upwards to drive the cover plate to move upwards, so that the effect of automatically opening the cover plate is achieved, the danger possibly caused when the cover plate is manually opened and closed is avoided, and the labor cost is saved.

This utility model relates to the technical field of pile foundation skin friction testing, and discloses a device for rapidly testing the negative skin friction of pile foundations in high-fill mountainous areas. The device includes backfill soil, beneath which lies a strongly weathered rock layer, and below that, a moderately weathered rock layer. A data acquisition system is installed on the left side of the top surface of the backfill soil, and a loading oil pump is installed on the right side. Utilizing the end resistance from the rock foundation load test to provide the reaction force, combined with data from pile stress sensors, the distribution characteristics of negative skin friction on the pile side in high-fill areas can be rapidly and quantitatively analyzed, providing a measured basis for pile foundation bearing capacity assessment and engineering design. This method uses the upward displacement of the pile under the action of a load cell to replace the settlement of the foundation soil, thereby efficiently testing the negative skin friction, significantly reducing testing costs and saving testing time.

The utility model belongs to the technical field of kettles, and particularly relates to a cold extraction coffee pot which comprises a pot body, a pot opening part arranged at an opening of the pot body, a water outlet arranged on the pot opening part and a pot cover matched with the water outlet. The kettle cover is connected with the water outlet through an axial adjusting structure, and a first sealing structure and a flow guide channel communicated with the interior of the kettle body are arranged at the joint of the kettle cover and the water outlet. When the kettle cover moves downwards through the axial adjusting structure, the kettle cover and the first sealing structure are matched with each other to seal the water outlet and the flow guide channel. When the kettle cover moves upwards through the axial adjusting structure to open the water outlet, the flow guide channel is communicated with the outside, the opening size of the water outlet is adjusted by controlling the displacement of the kettle cover, the opening height of the flow guide channel is dynamically controlled, and therefore the water outlet flow is accurately adjusted, and the problem of sudden flow increasing of a traditional open type water outlet is solved; and continuous control over the pouring flow speed can be achieved through linear adjustment, and overflow prevention and fluency are both considered.

The utility model discloses a telescopic fixed support belongs to the heat supply engineering technical field. The support includes the telescopic base fixed on the steel roof beam, and the telescopic base inner chamber sets up spring assembly and support, and spring assembly plays the elastic support effect to support, and the support upper end passes through the guide portion of telescopic base and extends outward and is connected steam pipeline. When the pipeline is heated and expands and contracts, the spring assembly allows the support to move vertically, releases stress, and avoids the fixed support damage. The utility model discloses simple structure, reliable, solved the steam pipeline in the high low arrangement scene and caused the stress concentration problem of the displacement of the upward position, improved the security and service life.

The utility model discloses a quantitative blanking and fertilizing device with mixing and stirring functions, which relates to the technical field of agriculture and comprises a frame, a handle is fixedly mounted on the surface of the frame, a quantitative blanking mechanism is arranged on the surface of the frame, and a mixing and stirring mechanism is arranged on the surface of the quantitative blanking mechanism. When fertilizer enters a fixed sleeve, a rotating movable sleeve divides the interior of the fixed sleeve into multiple groups of spaces through partition plates, quantitative material distribution is achieved, and finally the fertilizer is discharged from a discharging opening, when the fertilizer amount needs to be reduced, an electric telescopic rod pushes a boss, so that two groups of sliding blocks move upwards, and a connecting rod connected with the sliding blocks drives a rotating disc to rotate; at the moment, the adjusting rod moves upwards along the sliding groove to push the adjusting plate to move, and the two sets of rubber pads are attached to each other, so that the gap in the surface of the sliding groove can be filled, and meanwhile normal displacement of the adjusting rod is not affected.

The utility model relates to the technical field of hand sanitizer distillation, and provides a distillation device for producing hand sanitizer, which comprises a distillation barrel, a connecting pipe penetrates through the side surface of the distillation barrel, a collecting barrel penetrates through one end, far away from the distillation barrel, of the connecting pipe, and a valve is arranged at the bottom of the collecting barrel. The force for driving the rotating rod to rotate by the motor is matched with components such as a stirring plate, a fixed plate and a stirring blade in the distillation device, so that when the roller rotates to the side surface of the mounting block, the roller is extruded to move upwards, and then the roller moves upwards to drive the fixed rod to move upwards; the stirring blades are driven to move upwards through displacement of the fixing rods, when the rollers are far away from the mounting blocks, the fixing rods achieve the effect of reciprocating up and down in the rotating process of the stirring blades under the action of self gravity resetting, the stirring effect is improved, the contact area is increased, and uniform stirring among different substances is promoted.

The utility model relates to a sliding door and window field especially a sliding window's slide rail structure, the window frame includes the slide rail, the groove bottom of slide rail inside is equipped with a guide strip, both sides wall of slide rail inside are equipped with b guide strip, the sash frame bottom is provided with the pulley section bar, the pulley section bar includes the upper connecting portion and the lower sliding portion, be provided with the connecting plate portion between the upper connecting portion and the lower sliding portion, the pulley section bar is provided with the bearing pulley and the anti-swing wheel, the top of two b guide strips is provided with the baffle, and the baffle between two has the gap, the connecting plate portion sets up in the gap, and the sash frame utilizes the bearing pulley and the anti-swing wheel with the a guide strip and b guide strip of setting up in the slide rail cooperation, utilizes b guide strip and the anti-swing wheel to prevent the transverse deviation of sash frame, ensure the fluency of sash frame sliding, and is provided with the baffle above b guide strip, and the lower sliding portion is displaced upward through the baffle, and then prevent the pulley section bar from falling off and the sliding cooperation of slide rail.

The invention discloses an efficient gear hobbing machine, and belongs to the technical field of gear hobbing machines. The machine tool mainly comprises a machine tool body, a deburring assembly, a displacement driving assembly and a covering assembly. The deburring assembly comprises an annular sleeve box capable of sliding in the axial direction of the boss and a milling disc. The covering assembly comprises an arc-shaped protecting cover arranged on the clamp base and a driving top shaft. The driving displacement assembly is in linkage with the hob head stroke, the annular sleeve box is driven to move upwards, the arc-shaped protection cover is pushed by the driving jacking shaft loaded by the annular sleeve box to execute the opening action, the milling disc is exposed and tightly attached to the bottom face of the gear to be machined, and autorotation cutting is synchronously executed in the hob return stroke stage. Automatic avoiding, dynamic protection and online cleaning of the deburring mechanism are achieved through mechanical linkage logic, plastic casting burrs at the bottom of a gear are effectively removed, and the machining efficiency and the bottom surface cleanliness are improved while it is guaranteed that a precision assembly is free of chip interference.

The invention discloses a telescopic fixing support, and belongs to the technical field of heat supply engineering. The support comprises a telescopic base fixed to a steel beam, a spring assembly and a support are arranged in an inner cavity of the telescopic base, the spring assembly plays a role in elastically supporting the support, and the upper end of the support penetrates through a guide part of the telescopic base, extends outwards and is connected with a steam pipeline. When the pipeline expands with heat and contracts with cold, the spring assembly allows the support to move vertically, stress is released, and the fixing support is prevented from being damaged. The structure is simple and reliable, the problem of stress concentration caused by upward displacement of the steam pipeline in a high-low arrangement scene is solved, the safety is improved, and the service life is prolonged.

This utility model discloses a paper cutter with an anti-paper shift structure, relating to the field of manual paper cutter technology. The utility model includes a cutting table, a base extending through one side of the bottom of the cutting table, and a base plate extending through the bottom of the base. A top rod is connected to the top of the base plate via a spring. A pressure plate is sleeved on the outside of the top rod, and an anti-slip pad is connected to the bottom of the pressure plate via a first and a second Velcro fastener. An operating lever extends through one side of the pressure plate. This utility model, through the arrangement of the spring, top rod, and pressure plate, allows the pressure plate to be manually pressed downwards, pressing it firmly against thinner stacks or single sheets of paper, preventing paper shift during cutting. After cutting, stopping the pressure plate operation allows the spring to drive the top rod upwards, lifting the pressure plate back to its original position for the next cutting operation. The operation is simple and convenient. Compared to screw and lever-type paper pressing structures, it is even simpler and more convenient for pressing smaller stacks or single sheets of paper; the structure is simple and the operation is convenient.

The utility model relates to the technical field of lithium batteries, and provides a lithium battery sealing body tray loading and conveying device which comprises a supporting frame, the top of the supporting frame is fixedly connected with a protective shell, a discharging box is arranged on the side face of the protective shell, a feeding tray is arranged on the inner wall of the discharging box, and a conveying structure is arranged on the inner wall of the discharging box. And a discharging device is arranged in the supporting frame and comprises a motor, and the motor is fixedly connected to the inner wall of the protective shell. The force for driving the rotating rod to rotate by the motor is matched with components such as a gear, a gear disc and a rotating rod A in the blanking device, so that a rotating shaft rotates to drive a fixed rod to rotate, and then the fixed rod rotates to drive a roller to rotate, so that the roller extrudes a blanking plate to move upwards; the telescopic rods and the springs at the bottom of the discharging plate are stretched, and when the rolling wheels are away from the discharging plate, the discharging plate is reset through the elastic force of the springs.

The invention discloses a rotor wing-fixed wing conversion device, an aircraft and a conversion method, and particularly relates to the technical field of aircrafts, the rotor wing-fixed wing conversion device comprises a rotating mechanism, a conversion mechanism and a connecting rod mechanism, the rotating mechanism comprises a driving device and a T-shaped support, and the conversion mechanism comprises a moving disc and a linear telescopic device; when taking off in a rotor wing mode, the driving device drives the T-shaped support to rotate around the axis of a vertical rod of the T-shaped support, a transverse rod of the T-shaped support synchronously drives wing blades on the two sides to rotate, and when the rotor wing mode is converted into a fixed wing mode, the linear telescopic device is started to extend to push the movable disc to move upwards along the vertical rod of the T-shaped support; upward displacement of the movable disc is transmitted to the wing connecting rod through the connecting rod mechanism, so that the wing connecting rod rotates around a cross rod of the T-shaped support until the wing blades complete 90-degree directional overturning, and rigid conversion of the wing blades from a rotor wing mode to a fixed wing mode is completed. The unmanned aerial vehicle has the flexibility of vertical take-off and landing and the high efficiency of high-speed cruise, and is light in structure and high in aerodynamic efficiency.

The present application belongs to the technical field of sensor detection equipment, and discloses a kind of calibration device and method of resistance strain type displacement sensor, calibration device includes force support, fulcrum support, fulcrum spring piece, beam, lower center block and upper center block, fulcrum support is oppositely arranged with force support, one end of beam is connected to fulcrum support by fulcrum spring piece, and the other end is connected with force support;Upper center block is connected with lower center block, and both are respectively provided with first semicircular cone convex and second semicircular cone convex, first semicircular cone convex and second semicircular cone convex are oppositely spaced;Lower center block is slidably connected with beam;Force support is used to drive one end of beam to move up and down, so that second semicircular cone convex or first semicircular cone convex applies an upward displacement or downward displacement to free end.The present application can reduce displacement feed amount to increase calibration point number, effectively improve the calibration precision and accuracy of resistance strain type displacement sensor.

The invention discloses a combined supporting rail piece for a turnout wheel load conversion area, which comprises a fixed rail, a movable rail and a supporting frame, and the supporting frame is rigidly combined with the fixed rail; the bearing frame is arranged in the longitudinal direction of the fixed rail to form a longitudinal continuous sliding bearing face to support the rail bottom of the movable rail. A limiting groove is formed in the side edge of the supporting frame on the sliding bearing surface, and the non-working edge of the rail bottom of the movable rail is embedded into the limiting groove; when the movable rail is in a normal state, a preset gap d1 is formed between the rail bottom of the non-working edge of the movable rail and the inner wall of the limiting groove; when the movable rail is lifted, a lifting gap d2 is formed between the rail bottom of the movable rail and the sliding bearing face, the upper surface of the rail bottom of the non-working edge of the movable rail makes contact with the inner wall of the limiting groove, and rigid limiting is formed. The precise matching between the movable rail and the fixed rail can be ensured to be stably kept for a long time, and the continuous and controllable constraint on the upward displacement of the movable rail is realized through the integrated supporting frame.