33 results about "Lifting - difficulty" patented technology

The invention provides a bearing supporting device used for a wind generating set, an installing method and the wind generating set. The wind generating set comprises an impeller and a generator. A main bearing pedestal of the generator is sleeved with a hub of the impeller. The bearing supporting device used for the wind generating set comprises at least one locking connecting part, and the locking connecting parts are provided with locking wedges arranged between the main bearing pedestal and the hub. The lifting difficulty can be lowered through the bearing supporting device used for the wind generating set.

The invention discloses a light combined hanging box with recyclable baseplate steels. The light combined hanging box comprises a baseplate, four wall bodies, an outrigger, and lateral stable support beams which are connected between the outrigger and the wall bodies; wherein the four wall bodies are connected by a support frame; a lifting lug is arranged at the upper end face of outrigger; a jack placing beam is arranged under the outrigger; the outrigger is connected with the baseplate by a supporting column; a jack is arranged between the outrigger and the jack placing beam; the lower end of the jack placing beam is connected with the top end of a steel casing. The light combined hanging box has the following advantages: 1, the bearing abilities of bamboo plywood and bottom sealing concrete are fully used under a condition that a poor sea state of open seas is overcome, the turning of the baseplate steels is effectively realized, and the steel consumption is greatly reduced; 2, the structure is light; for the hanging box of the same specification, the lifting weight of the combined baseplate hanging box is similar to the self weight of a traditional steel baseplate hanging box, so that relative to the concrete prefabricated baseplate steel hanging box, the rated load weight and the lifting difficulty of a floating crane are effectively reduced.

The invention discloses a light prefabricated type concrete plate column foundation and a construction method thereof. The foundation comprises a prefabricated lightweight aggregate concrete stand column and an assembly lightweight aggregate concrete bottom plate, a connecting sleeve is connected to the tail ends of longitudinal steel bars of the prefabricated stand column, one end of the connecting sleeve is flush with the concrete bottom face of the stand column, the prefabricated bottom plate extends out by a certain length of reserved steel bars, the bottom plate is combined into a whole through a connecting part, and is connected with the stand column through grouting of the connecting sleeve, the construction efficiency of the foundation can be obviously improved through the foundation, the transport cost is saved, and the construction lifting difficulty is reduced; and the capacity of resisting the adverse environmental impact by the foundation is improved, the service life is prolonged, energy and resources are saved, and the pressure on the environment is reduced.

The invention provides an installation process for a back well drilling type platform sleeving-free wellhead. The installation process comprises the following installation steps that 1, a water insulation casing pipe is divided into three or four sections of water insulation casing pipe bodies, the first two or three sections of water insulation casing pipe bodies are made to reach the designed driving depth after penetration into the seabed, and the tail section of water insulation casing pipe body is reserved; 2, a pipe guide frame is installed on the sea; 3, the first two or three sections of water insulation casing pipe bodies which reach the designed driving depth after penetration into the seabed are installed on the sea; 4, an upper assembling block is built on the land, and the tail section of water insulation casing pipe body is installed and fixed to a wellhead area of the upper assembling block; 5, the upper assembling block and the tail section of water insulation casing pipe body fixed to the upper assembling block are transported on the sea; and 6, after the upper assembling block is installed on the sea, fixing of the tail section of water insulation casing pipe body is removed, and the tail section of water insulation casing pipe body is connected back to the first two or three sections of water insulation casing pipe bodies. According to the installation process for the back well drilling type platform sleeving-free wellhead, the problems that the lifting difficulty of the upper assembling block on the sea is large, and the requirements for a weather window and the sea conditions are high are solved; and in addition, wellhead sleeving is avoided, so that the installation risk of the upper assembling block on the sea is reduced.

The invention discloses a turning process method for a large container component. The method is characterized by comprising the steps of: turning the container component from the vertical direction to the horizontal direction, and turning the container component from the horizontal direction to the vertical direction. The problem that the large container component is turned without a lug is solved in a process from sling mounting to turning, a flange sealing surface is protected through an additionally arranged sealing base plate for protection, a method for applying a pre-tightening force on the bolt is adopted, the frictional resistance of the contact surface between a sling and the container component is increased, a double-end main bolt is prevented from bearing the shear force, and the fatigue limit of the bolt is reduced. In addition, a uniaxial double-wheel sling is hung on two wheels by utilizing two annular steel wire ropes, so that the container component is stable during turning and lifting, and the turning and lifting difficulty and risk are reduced.

The invention relates to a wind generating set foundation anchor bolt assembly and a construction method of a connecting tower cylinder thereof. The wind generating set foundation anchor bolt assemblycomprises an upper anchor plate, a lower anchor plate, multiple anchor bolts, a supporting casing pipe set and a protecting casing pipe; the anchor bolts are connected with the upper anchor plate andthe lower anchor plate, the supporting casing pipe set comprises a first supporting pipe, a second supporting pipe and a connecting pipe fixedly connected with the first supporting pipe and the second supporting pipe, two adjacent anchor bolts are sleeved with the first supporting pipe and the second supporting pipe correspondingly, the upper anchor plate is supported by the first supporting pipeand the second supporting pipe, the protecting casing pipe is arranged on remaining anchor bolts in a sleeving manner, two adjacent anchor bolts are sleeved with the integrated supporting casing pipeset, deviation of the anchor bolts in the horizontal direction after the anchor bolts are arranged on the upper anchor plate and the lower anchor plate can be limited, whole torsion deforming of theanchor bolts around a vertical shaft of the foundation anchor bolt assembly is avoided, whole precision of the wind generating set foundation anchor bolt assembly is improved, the quality of the windgenerating set foundation anchor bolt assembly is improved, and the tower cylinder lifting difficulty is reduced.

The invention discloses an adjustable assembly type lifting appliance which comprises a lifting beam. A sliding seat is slidably connected to the lifting beam in a sleeving manner; an elastic clamping piece mechanism is transversely arranged in the lifting beam; the elastic clamping piece mechanism comprises a fixing plate and a connecting plate; the fixing plate and the connecting plate are located in the lifting beam, wherein the fixing plate is transversely and fixedly installed in the lifting beam; the connecting plate is connected with the fixing plate through a spring set arranged at the bottom; limiting columns are evenly arranged on the upper portion of the connecting plate; a lifting lug mechanism is further fixedly arranged on the upper portion of the sliding seat; and a lifting hook mechanism is arranged at the bottom of the sliding seat. According to the adjustable assembly type lifting appliance, the lifting beam and the sliding seat are adjustably assembled and connected, so that fabricated prefabricated parts and parts with different shapes and different processes can be efficiently lifted, the lifting difficulty is effectively reduced, and the applicability of the lifting appliance to the fabricated prefabricated parts and the parts is improved.

The invention discloses an assembly-type cone-column-plate-column-combined foundation for an electric transmission line and a construction method thereof. The assembly-type cone-column-plate-column-combined foundation comprises a base and a supporting section connected onto the base. The supporting section comprises a cone column section and a hollow section which are sequentially arranged from top to bottom, and an embedded part is connected to the top end of the cone column section. The base comprises a middle concrete crossbeam connected with the supporting section through a flange, external concrete crossbeams are arranged on the two sides of the long edge of the middle concrete crossbeam in parallel, and the middle concrete crossbeam and the external concrete crossbeams are fixed together through a plurality of concrete battens arranged in parallel. A steel reinforcement cage is poured with concrete in the cone column section, and the steel reinforcement cage and the flange are welded or mechanically connected together. By means of the foundation, frozen-earth and frost-heaving damage can be avoided, self-weight is small, the size of jointed components is small, the transportation cost is saved, lifting difficulty is lowered, the quantity of concrete materials and the structural self-weight are reduced, and structural design is more economical; due to prefabricated concrete components, the construction period is shortened, and concrete quality is guaranteed.

The invention relates to a high-altitude lifting construction method for an overweight steel truss of a transferring layer. The high-altitude lifting construction method comprises the following steps of: firstly paving tracks on the floor at the lifting area of the transferring layer, then using a crane to lift a rod piece of the steel truss onto the tracks paved on the floor in advance, then arranging a guide pulley block, sliding the rod piece of the steel truss to be in position by the tracks, finally utilizing the matching of the pulley block and the crane, lifting the rod piece of the steel truss to the installing position and finishing the assembling construction. The innovative construction technology has the advantages that the high-altitude lifting difficulty in hoisting of a transferring truss is successfully solved, and the smooth and safe completion of the lifting operation in shortest time can be ensured. The high-altitude lifting construction method overcomes the limit of lifting of a large-tonnage truck crane adopted in the prior art, is safer and more reliable, can shorten the construction period and save the cost and the like, can lay the foundation for successful completion of a main engineering and is an optimal construction scheme for high-altitude lifting of the similar overweight steel truss of the transferring layer.

The invention discloses a lifting tool and method special for lifting brick fuel and a crane for the lifting tool and method. A jacking device (1), a lifting tool device (2) and a rotation mechanism (3) are arranged, the rotation mechanism (3) is connected with the jacking device (1) and the lifting tool device (2), and the lifting tool device (2) rotates in the horizontal direction along with therotation mechanism (3); the lifting tool device (2) rotates by a certain angle along with the rotation mechanism (3), a clamp body (22) rotates along with the lifting tool device (2), meanwhile, a connecting rod device (13) descends, and a clamping plate (224) clamps the brick fuel with the best angle. The lifting tool is provided with the rotation mechanism, angle conversion of a clamp body is achieved, the problem of brick fuel lifting difficulty caused by disordered brick fuel stacking is solved, and the brick fuel is clamped with the best angle in the working process of the clamp body; meanwhile, the clamp body is of a parallelogram connecting rod structure, movement of the clamping plate in the linear horizontal direction is guaranteed, the largest contact area between the clamp bodyand the brick fuel is guaranteed, and the clamping force is increased.

A coupling device for a frame and bodywork is characterized by being composed of the bodywork, the frame, a bodywork traction seat, a hanging plate and a hanging hook plate. The hanging plate is welded to the frame, and hooks are arranged in the middle of the side wall of the hanging plate. The bodywork traction seat is welded to the bottom of the bodywork, the hanging hook plate is installed and fixed to the traction seat through bolts, spring cushions and a large gasket, hooks on the hanging hook plate and the hooks on the hanging plate are combined together, and therefore the coupling device for the frame and the bodywork of a rail car truck is formed. According to the coupling device, a rubber joint of an axle box pull rod and a hydraulic shock absorber are protected against damage, the lifting difficulty and potential safety risks after transferring or hoisting for maintenance or derailing of a car are avoided, the maintenance time is shortened, and economic benefits of an enterprise are improved.

The invention discloses a power emergency logistics support cold storage square cabin. The power emergency logistics support cold storage square cabin comprises a square cabin body, a buffer plate isfixedly arranged at the bottom of the square cabin body, two fixing holes are formed in the top of the buffer plate, buffer columns are arranged in the two fixing holes in a sliding mode, the bottom ends of the two buffer columns are fixedly provided with the same bottom plate, first pressure springs sleeves the outer sides of the two buffer columns, four mounting seats are fixedly arranged at thebottom of the bottom plate, mounting grooves are formed in the bottoms of the mounting seats, sliding seats are slidably arranged in the mounting grooves, and second pressure springs are fixedly arranged at the top ends of the sliding seats. The power emergency logistics support cold storage square cabin is economical and practical, shaking of the square cabin body is relieved under the elastic action of the first pressure spring, the second pressure spring and the third pressure spring, the buffering and damping effects are enhanced, damage to the interior of the square cabin body is avoided, a base is driven to move through a stepping motor, so that the height of the square cabin body can be adjusted conveniently, the lifting difficulty is small, and meanwhile, the position of the square cabin body after moving can be fixed.

The invention discloses a special purpose machine tool for circular mold drilling. The special machine tool comprises a machine tool bed body, wherein main shaft seats are arranged on the two sides ofthe top end of the machine tool bed body, and the two sides of the top ends of the two main shaft seats are correspondingly provided with main shafts; the middle part of the top end of the machine tool bed body is provided with a hydraulic telescopic rod, the middle part of the top end of the hydraulic telescopic rod is provided with a rotating table, and the middle part of the top end of the rotating table is provided with a clamping jaw; and a groove is formed in the middle end of the outer surface of the rotating table, and the middle part of the inner wall of the groove is provided with apositioning mechanism. The special purpose machine tool for the circular mold drilling is scientific and reasonable in structure, and safe and convenient to use; a bugle ring, a connecting ring, a connecting rod, a circular ring, a positioning rod, a limiting plate, a vertical plate, a fixing plate and the hydraulic telescopic rod are arranged, so that the lifting of the clamping jaw can be facilitated, and the lifting difficulty of the clamping jaw is lowered; and meanwhile, the clamping jaw can be positioned, the positioning difficulty between the clamping jaw and the main shafts is reduced, and the drilling machining of a circular mold on the clamping jaw can be further facilitated.

The invention discloses a window glass lifting system. The window glass lifting system comprises a window glass, a window glass lifter and two parallel guide rails. The window glass is in a double-curvature bent shape. Trajectories of the guide rails refer to rotating hook face spiral lines. According to the window glass lifting system, the trajectories of the guide rails are set to be the rotating hook face spiral lines, the window glass lifting trajectories are turned to be spiral lifting, the deviation of window glass movement and the rotating hook face is basically zero during theoreticaldesign, the deviation of the guide rail trajectories and the window glass edge is also basically zero, the effect that the key factors of lifting difficulties and failures for the window glass cannotoccur is guaranteed, and the lifting movement requirements of the double-curvature bent shape glass are met.

The invention discloses a gear-rack bolt lifting system and a lifting method thereof. The gear-rack bolt lifting system is arranged on a pile leg in a sleeving way, and comprises a moving ring beam, alifting rack, a lifting unit, a lifting foundation and a bolt mechanism, wherein the lifting foundation is arranged on a deck of an offshore platform; the lifting unit is arranged on the lifting foundation; the bottom end of the lifting rack penetrates through the lifting foundation; and the lifting rack meshes with a lifting gear. The intermittent lifting of the offshore platform is realized; and compared with a hydraulic bolt lifting system, the average lifting speed is faster, the gear-rack bolt lifting system is stable and reliable, the use of a lifting oil cylinder easy to leak and difficult to maintain is avoided, the lifting efficiency is high, and the average lifting speed can reach to 30m / h. The lifting rack is arranged on the bottom part of the moving ring beam, and no pile fixing chamber and a fixed ring beam is needed to be used, so that the structure is simplified, the cost is greatly saved, and the lifting difficulty is reduced.

The invention discloses a climbing type scaffold and a climbing and mounting method thereof and a construction method of a fabricated building. The climbing type scaffold comprises anti-overturning supports arranged on a wall body in at least two rows, guide rails, a frame body, an upper lifting steel beam, a lower lifting steel beam, and an electric hoist; each row of supports comprise a plurality of anti-overturning supports longitudinally distributed along the wall body; the guide rails are embedded in each row of anti-overturning supports, and the guide rails ascend or descend relative to the anti-overturning supports; the frame body is arranged on the guide rails; the upper lifting steel beam is arranged on the wall body and is positioned at the upper end of the frame body; the lower lifting steel beam is arranged at the lower end of the frame body, and the lower lifting steel beam and the upper lifting steel beam are correspondingly arranged; and the electric hoist is arranged on the upper lifting steel beam, and a suspension wire of the electric hoist is connected to the lower lifting steel beam. According to the climbing type scaffold and the climbing and mounting method thereof and the construction method of the fabricated building, the lifting difficulty of the scaffold is reduced, the safety risk is reduced, the construction efficiency is improved, cracks generated at the joint between the frame body and the building structure are reduced, the construction quality is improved, and the cost is reduced.

The invention discloses a light combined hanging box with recyclable baseplate steels. The light combined hanging box comprises a baseplate, four wall bodies, an outrigger, and lateral stable support beams which are connected between the outrigger and the wall bodies; wherein the four wall bodies are connected by a support frame; a lifting lug is arranged at the upper end face of outrigger; a jack placing beam is arranged under the outrigger; the outrigger is connected with the baseplate by a supporting column; a jack is arranged between the outrigger and the jack placing beam; the lower end of the jack placing beam is connected with the top end of a steel casing. The light combined hanging box has the following advantages: 1, the bearing abilities of bamboo plywood and bottom sealing concrete are fully used under a condition that a poor sea state of open seas is overcome, the turning of the baseplate steels is effectively realized, and the steel consumption is greatly reduced; 2, the structure is light; for the hanging box of the same specification, the lifting weight of the combined baseplate hanging box is similar to the self weight of a traditional steel baseplate hanging box, so that relative to the concrete prefabricated baseplate steel hanging box, the rated load weight and the lifting difficulty of a floating crane are effectively reduced.

The invention discloses a detection method for lifting difficulty and lifting slowness with a displacement fault of a compartment of a tilting cart. The detection method is characterized by comprising the following steps that (a) oil return at an oil return connector of a lifting oil cylinder is detected; (b) the rotating speed of an engine is increased, and the ascending speed of the oil cylinder is detected; (c) the compartment continues being lifted after being lifted by a certain distance, and whether the displacement fault exists is detected. By executing the detection method for lifting difficulty and lifting slowness with the displacement fault of the compartment of the tilting cart step by step, the fault part can be rapidly judged, the overhaul efficiency can be improved, the matching precision of all components can be guaranteed, and the service life can be prolonged.

The invention provides a liftable operation platform for soft soil foundation construction and a building method. The liftable operation platform comprises an inflatable cushion, a force transmission platform, an operation platform, latticed columns and hoisting mechanisms, wherein the inflatable cushion is placed on a soft soil foundation in a foundation pit, the force transmission platform is placed on the inflatable cushion, the latticed columns are evenly fixed to the force transmission platform, the hoisting mechanism is installed at the upper end of each latticed column, and the hoisting mechanisms drag the periphery of the operation platform through hoisting chains, so that the operation platform are lifted. The scheme of modular combination, simple assembly and disassembly and repeated turnover is adopted, a novel operation platform system is designed, and on the premise that the construction requirement under the soft soil foundation condition is met, the construction time is greatly shortened, engineering resources are saved, the engineering cost is reduced, and the lifting difficulty of the platform is reduced; and therefore, the technical problem can be solved conveniently and effectively by adopting the turnover foundation pit support inner support construction operation platform system under the condition of soft soil texture.

The invention provides a straight leg lifting functional exercise belt, and relates to the technical field of medical instruments. The straight leg lifting functional exercise belt comprises a supporting seat, a measuring plate, two leg hook pieces and a limiting rod; the bottom of the supporting seat is hollow, and an elastic stretching belt is located at the bottom of the supporting seat; the measuring plate is connected with lifting rods, a connecting hole is formed in the front end of each lifting rod, and the front end of each lifting rod is connected with the supporting seat through the elastic stretching belt; the two leg hook pieces are arranged in a bilateral symmetry mode, and the lifting rods are fixedly connected with the leg hook pieces through bolts; and the limiting rod is connected into the top of the measuring plate. The ankle of an exerciser is attached to the inner sides of the leg hook pieces, when straight leg lifting of the exerciser is performed, the leg hook pieces drive the lifting rods to rotate and lift, the elastic stretching belt applies reverse tension to the front ends of the lifting rods, the straight leg lifting difficulty of the exerciser is increased, and the effect of enhancing the leg muscle strength is achieved.

The invention provides an electric power window lifting test bed and a test method. The test bed comprises: a touch screen, a start switch and an indicator light which are arranged on a panel; a socket on the lateral surface of the test bed; and a central processor, a detection unit, a contactor, an entire machine power supply and a lifter motor power supply which are arranged in the test bed, wherein the detection unit is used for detecting the current and voltage output to a glass lifting motor, and the contactor controls the start and the stop of the glass lifting motor. A control device and the detection device are used to detect all the lifting parameters of the electric power window like the control function on a whole vehicle and count without manual intervention. Therefore, whether a whole vehicle glass lifting system satisfies the design performance requirements of products or not, is monitored and evaluated and the fault phenomena such as glass lifting difficulty and abnormal noise are analyzed by the technical personnel in aid of the test bed.

The invention relates to a safe lifting support for high-altitude pipeline mounting. The safe lifting support for high-altitude pipeline mounting comprises a safe bottom plate, inclined struts, a fixed sleeving rod, a movable mandrel, limiting bolts and an anti-rolling support limiter, one end of the fixed sleeving rod is vertically welded at the center of the safe bottom plate, one ends of the inclined struts are welded on the safe bottom plate while the other ends thereof are welded on the outer wall of the fixed sleeving rod, multiple pairs of equidistant equal-diameter holes are chiseled on a rod body of the fixed sleeving rod and a body of the movable mandrel, the internal diameter of the limiting bolts is matched with the internal diameter of the holes on the fixed sleeving rod and the movable mandrel, mantle fibers are arranged at two ends of each limiting bolt, the movable mandrel is inserted into the fixed sleeving rod and fixed together with the same through the limiting bolts and nuts, and the anti-rolling support limiter is mounted at the top of the movable mandrel. The safe lifting support for high-altitude pipeline mounting can be produced in height according to actual situations, the problems of potential safety hazards and low construction efficiency due to on-site one-time over-height lifting of large-diameter pipelines are solved, lifting difficulty of the large-diameter pipelines is lowered greatly, mounting of equipment such as roof chain block is avoided, and on-site construction efficiency is improved greatly.

The invention discloses a crane shoulder pole method lifting method. The method is characterized by comprising the following construction steps: (1) a shoulder pole lifting device is produced; and a lever is selected according to the weight of a lifting part; (2) manufacturing of lifting lugs: the lifting lugs are manufactured according to the weight magnitude of the lifting part; the lifting lugs take the shape of half-arcs; three lifting lugs are provided; one lifting lug is arranged in the center of the upper surface of the lever; and the other two lifting lugs are respectively arranged at the two ends of the lower surface of the lever; (3) a lifting belt and the lifting part are fixed on a crane lifting hook and the lifting lug of the lever; and a traction rope is tightened on a balance lifting part; and (4) the crane is operated to reversely transport the lifting part to a lifting position; the lever is used for conveying the lifting part in place; and the traction rope is used for finely adjusting the lifting part to guarantee the accurate position of the lifting part. The crane shoulder pole method lifting method has the advantages of solving the lifting difficulties of pipes and components at gable edges of factory buildings, saving the mechanical use and improving the lifting efficiency.

The invention provides a ring chain type electric hoist with a shock absorption effect. The ring chain type electric hoist with the shock absorption effect comprises a control cabinet, a chain container, a fixed rod, a motor, shock absorption devices, a gravity sensor, a fixed plate and a chain, wherein the control cabinet is arranged on the support through a bolt; a slide rail is arranged on a cross rod of the support; the motor and the chain container are arranged on the slide rail of the cross rod of the support; the chain container is arranged on the motor; a chain winding device is arranged at the output end of the motor; the fixed rod is arranged in the chain container; a rear cover is arranged on the chain container; one end of the chain is arranged on the chain winding device; a pothook is arranged at the other end of the chain; the gravity sensor and a camera are arranged at the bottom end of the chain; and the shock absorption devices are arranged on support legs of the support. Compared with the prior art, the ring chain type electric hoist with the shock absorption effect provided by the invention has the following beneficial effects that the pothook can be convenientlyand accurately hung on an object to be hung since the camera is arranged, and the lifting difficulty is reduced.

The invention relates to a middle beam reinforcing and lifting device for steel structure transformation. The middle beam reinforcing and lifting device can effectively solve the problems that in the prior art, a crane cannot enter a construction area, a reinforced object cannot be manually lifted to a specified position, and the safety and the efficiency are low. According to the technical scheme, the middle beam reinforcing and lifting device comprises an original building lifting point setting device and a lifted object lifting point device, the original building lifting point setting device is composed of a first fixing plate, a second fixing plate, a lifting supporting plate, a reinforcing rib plate, a hand-screwing jackscrew and a nut, and the lifted object lifting point device is composed of supporting plates connected with one another. The middle beam reinforcing and lifting device is novel and unique in structure, simple and reasonable, easy to produce, small in lifting difficulty, safe, reliable, simple lifting operation of a transformed object, convenient to mount and demount, capable of greatly shortening the lifting time, capable of reducing the lifting difficulty, capable of saving time and labor, capable of being widely applied to super high-rise reconstruction and lifting of the transformed object in limited space, and innovative for the middle beam reinforcing and lifting device for steel structure reconstruction.

The invention relates to a slidable lifting auxiliary device. The slidable lifting auxiliary device comprises a frame body (1), a rotating bearing (2), a middle connecting plate (3), a screw rod (4),a transmission rod (6), a hinging bolt (7), a plane bearing (8), a supporting platform (9), a baffle plate (10), a side face connecting plate (11) and a supporting platform (19), the screw rod (4) arranged in the frame body (1) drives the middle connecting plate (3), the middle connecting plate (3) drives the rotating bearing (2), the rotating bearing (2) is used for stably lifting the supportingplatform (9) through the transmission rod (6), so that lifting of a large-scale switch mechanism is realized, fixing gears (13) in the supporting platform (19) at the lower portion of the device rotate to drive a chain (15), then the chain (15) drives the frame body (1) to move stably so that the relative position of the large-scale switch mechanism can be slidably adjusted. According to the slidable lifting auxiliary device, the technical defects that in the case of the large-scale switch mechanism, lifting difficulty is large, and the relative position can not be slidably adjusted are overcome.

A hitching device for a rail car frame and a bearing box is characterized in that a side wall of a hook seat is welded to the frame, the upper end of a hydraulic shock absorber and an upper cross arm of the hook seat are installed together through hinges, and the lower end of the hydraulic shock absorber and an upper supporting arm of the bearing box are installed together through hinges; a hanging hook groove is formed in a hanging hook at the lower end of the side wall of the hook seat, and a T-shaped hanging hook at the upper end of a lifting plate is located in the hanging hook groove in the hook seat; the lower end of the lifting plate is installed and fixed to the bearing box through nuts, bolts and spring cushions, a rail car wheel pair is installed on a wheel shaft in the bearing box, and therefore the hitching device for the rail car frame and the bearing box is formed. According to the hitching device, the rail car frame and the bearing box can be hitched together safely and reliably, the lifting difficulty and potential safety risks after transferring or hoisting for maintenance or derailing of a car are avoided, and economic benefits of an enterprise are improved.