40results about How to "Reduce swing" patented technology

The present application relates to a kind of rotary compressor, gas compression system, refrigeration system and heat pump system, rotary compressor includes cylinder, piston, crankshaft, swing block and sliding vane, the compression chamber and swing groove are arranged inside cylinder, piston is arranged in the compression chamber, swing block is rotationally arranged in swing groove, sliding slot is arranged on swing block, sliding vane is slidably arranged in sliding slot, and one end of sliding vane and the side wall of piston abut, the other end between the inner side wall of the cylinder is provided with the driving assembly for driving the one end of the sliding vane and the side wall of the piston abut, crankshaft is linked with piston, and drives piston to eccentric rotation in the compression chamber, swing block is synchronously swung back and forth in swing groove. By the sliding vane and the rocker block of prior art are designed as a whole, the swing amplitude of sliding vane and swing block can be greatly reduced, the friction power consumption is effectively reduced, and the cold leakage between sliding vane and piston can be reduced, the lubrication state between swing block and cylinder is improved, and the friction loss between sliding vane and cylinder is reduced.

This application discloses a method and system for planning the hoisting trajectory of a UAV based on industrial vision, relating to the field of UAV technology. The planning method includes the following steps: S1: Real-time acquisition of image data of the hoisting scene using industrial vision equipment; S2: Identification of obstacles, target placement area, and the position and shape information of the hoisted object from the preprocessed image; S3: Establishment of a dynamic model of the UAV-hoisted object system based on the information acquired by industrial vision; S4: Construction of a multi-constraint trajectory optimization objective function based on the dynamic model of the UAV-hoisted object system; S5: Generation of an initial hoisting trajectory; S6: Output of the final UAV hoisting trajectory. This method and system for planning the hoisting trajectory of a UAV based on industrial vision uses industrial vision equipment to acquire environmental information in real time, enabling timely perception of changes in the position of obstacles and targets in the dynamic environment, thus improving the adaptability of trajectory planning to the dynamic environment.

The application discloses a windproof device and method for improving the safety of a unit curtain wall, which comprises a base, an adsorption assembly, a winch, a cable, a counterweight assembly, a buffer tire assembly and a handrail. The adsorption assembly adsorbs and fixes the base to the surface of the unit curtain wall, the winch tightens the cable, so that the unit curtain wall is in tension constraint with the hook, the temporary anchor point or the adsorption fulcrum, thereby inhibiting the rotation and swing in the hoisting process; the counterweight assembly lowers the gravity center, the buffer tire assembly absorbs the in-place impact, and the handrail facilitates manual fine adjustment and positioning. The application can reduce the traditional cable wind rope layout, and improve the hoisting safety and efficiency of the unit curtain wall.

The utility model relates to a kind of multi-airbag coordinated trim's offshore semi-submersible vessel, belong to offshore semi-submersible vessel technical field, including semi-submersible vessel ontology, the front and rear sides of the left side of the upper surface of semi-submersible vessel ontology are all fixed with several first airbags by large cylinder bracket, one side of semi-submersible vessel ontology is equipped with anti-drop mechanism, and the anti-drop mechanism includes the fixed frame of being fixed in one side of semi-submersible vessel ontology and the number of two. The multi-airbag coordinated trim's offshore semi-submersible vessel, the stability when the ship dives can be increased by the buoyancy of several first airbags of front and rear sides, reduce swing and vibration, two second airbags are fixed in the two sides of semi-submersible vessel ontology, further enhance the lateral stability of ship, ensure that ship keeps balance in diving process, by the cooperation of fixed plate and protection frame, the outside protection performance of several first airbags of front and rear sides is promoted, reduce the impact of airbag in diving process by external object.

The utility model discloses a kind of blown film machines for film production, it is related to blown film machine technical field, including blown film mechanism, flattening mechanism, winding mechanism and cooling mechanism;Blown film mechanism includes material cylinder, and material cylinder is provided with hopper and die head;Flattening mechanism includes frame, and frame is provided with herringbone and the flattening roller group located in herringbone upper end;Winding mechanism includes machine table, and machine table is provided with winding roller group;Cooling mechanism includes air supply source and the cooling air ring being set in die head upper end, air supply source is connected with cooling air ring by pipeline, and the inner ring wall of cooling air ring is provided with multiple air outlets, and each air outlet central axis is inclined to be set relative to horizontal plane to oblique upper side;Air outlet central axis is inclined to be set relative to horizontal plane to oblique upper side, so that cooling airflow and bubble contact form angle, airflow continues to flow upwards after contacting bubble, improve the time and area of airflow and bubble contact, enhance the cooling effect to bubble.

The utility model relates to air conditioner installation technical field, and disclose a kind of air conditioner mounting plate's leveling device, the air conditioner mounting plate's leveling device, including support, two groups of scale board are fixedly connected in support bottom;Further include negative pressure adsorption mechanism, negative pressure adsorption mechanism includes the suction disc being set in the both sides of support top, suction disc bottom is fixedly connected with the hollow cylinder body that passes through support interior, piston head is movably installed in hollow cylinder body interior, and one end of piston head is fixedly connected with the support pole that extends out hollow cylinder body interior.Movable suction disc contact mounting plate, air is discharged through hollow cylinder body and one-way valve pipe, suction disc negative pressure adsorption, judge mounting plate level by scale board, when disassembling, pull support pole and drive piston head to leave hollow cylinder body, air enters to cancel adsorption, piston head resets seal after hand release, avoid to cause mounting plate deformation displacement to pull support.

The embodiment of the present application provides an engine multi-connecting rod mechanism, an engine and a vehicle, relates to the technical field of engines, and aims at improving the technical problem that the piston impacts the cylinder wall under the action of the connecting rod in the prior art, thereby causing poor NVH performance.The engine multi-connecting rod mechanism comprises a crankshaft, a piston and an intermediate connecting rod; the intermediate connecting rod comprises a first arm rod and a second arm rod; one end of the first connecting rod, which is away from the crankshaft, is movably connected with the first arm rod; one end of the second connecting rod, which is away from the piston, is movably connected with the connecting part; and one end of the second arm rod, which is away from the first arm rod, is movably connected with the cylinder wall.The intermediate connecting rod is arranged, and the first arm rod and the second arm rod are arranged at an included angle, so that the swing range of the second connecting rod is reduced, the piston is prevented from impacting the cylinder wall during movement in the cylinder wall, vibration and noise caused by the piston impacting the cylinder wall are weakened, and the NVH performance of the engine is improved.

The utility model relates to the technical field of unmanned aerial vehicle devices, in particular to an agricultural unmanned aerial vehicle hoisting device based on multi-mode stable suspension, which comprises a multi-mode suspension structure arranged at the bottom of an unmanned aerial vehicle main body, and is characterized in that the multi-mode suspension structure comprises an electromagnetic lock hook, and a main sling and an auxiliary sling which are arranged on the unmanned aerial vehicle main body; the electromagnetic lock hook is controlled by a circular power source, the main sling is driven by a main sling motor, the auxiliary sling is driven by an auxiliary sling micro motor, and the movable ends of the main sling and the auxiliary sling are jointly connected with the electromagnetic lock hook. Through cooperative control of the main sling and the auxiliary sling, the material swing amplitude can be reduced, the materials are prevented from impacting an unmanned aerial vehicle body or surrounding obstacles, and the flight safety in a complex farmland environment is guaranteed.

The application relates to a stirrer fixing device and relates to the technical field of sewage treatment, which comprises a mounting frame, a stirring assembly, a lifting assembly and a guide assembly. The mounting frame is fixedly installed on the wall of a sewage pool requiring stirring, the stirring assembly is installed on the mounting frame, the stirring assembly is used for stirring in the sewage pool, the lifting assembly is installed on the mounting frame, the lifting assembly is used for moving the stirring assembly, the guide assembly is installed between the mounting frame and the stirring assembly, and the guide assembly is used for stably moving the stirring assembly. The application has the effect of conveniently maintaining and repairing the stirrer.

This utility model discloses a pressure test device for hydrogeological engineering surveys, including a main body and a support mechanism located on one side of the main body. This support mechanism reduces the sagging caused by the device connecting to the hose through bottom support, ensuring the stability of the connection end. The support mechanism includes a side frame fixedly connected to one side of the foot pad. Water is introduced through an external hose when the valve body is opened. Water is introduced into the pressure test air chamber at one end of the water inlet pipe through a water meter and the valve body. After being pressurized in the pressure test air chamber, water is discharged through a drain pipe. This effectively reduces the sagging caused by the device connecting to the external hose during the assembly and use of pressure tests in hydrogeological engineering surveys. This also ensures that during long-term use, the connection end is not affected by external force accidental contact or impact force generated during water supply, thus reducing the shaking amplitude caused by the impact force. This improves the confidentiality of the connection and reduces the occurrence of water leakage after loosening.

This utility model relates to the field of connector electrical testing, specifically to a connector electrical testing device. It primarily addresses the problem of loose connections between terminals and proposes the following technical solution: It includes a base, with a drive motor fixedly connected to the bottom of the base. The base is fitted with a sliding test assembly, which includes a mounting plate. A micro probe is disposed through the mounting plate, and the end face of the micro probe movably abuts against a gold-plated steel pin holder. This utility model allows the micro probe to slide through the side of the mounting plate, replacing the elastic lever arm with direct sliding, thus avoiding loose connections during testing. Furthermore, by allowing the micro probe to abut against the gold-plated steel pin holder, it ensures that when the micro probe is pushed by an external force, it first contacts the gold-plated steel pin holder, and then the gold-plated steel pin holder continues to move under force. During this displacement, the micro probe does not directly contact the product pins, which helps reduce the oscillation of the micro probe.

The utility model belongs to the field of sliding plug door, concretely refers to sliding plug door door shaft subassembly, sliding plug door drive arrangement, sliding plug door and vehicle. Sliding plug door door shaft subassembly includes door shaft and is fixed on the upper crooked arm of door shaft, still includes the link frame link for hinging with connecting seat, link frame link and upper crooked arm are connected through connecting rod, and upper crooked arm, link frame link and connecting rod form four connecting rod mechanism, and the part of four connecting rod mechanism far from upper crooked arm is hinged with the transmission rod for connecting the swing end of guide frame, to make swing end drive door shaft rotation through transmission rod and four connecting rod mechanism. Sliding plug door drive arrangement includes above-mentioned sliding plug door door shaft subassembly. Sliding plug door and vehicle all include above-mentioned sliding plug door drive arrangement. Through the configuration link frame link and connecting rod, the upper crooked arm of door shaft is changed into a rod of four connecting rod mechanism, and the utility model only needs to adopt shorter transmission rod to transmit the left and right swing of guide frame as the reciprocating rotation of door shaft, saves a large amount of space near door shaft, helps to promote the utilization of vehicle front wall space.

This utility model relates to the field of automotive headrest support rod manufacturing technology, and in particular to a ring-shaped LED lighting lamp. The mounting base and base have interconnected grooves inside. Multiple movable locking blocks are installed on the inner walls of the base and grooves. Movable fixing posts are provided inside the grooves of the mounting base and base. Limiting components that cooperate with the locking blocks are provided at the top and outer sides of the fixing posts. By engaging the upper hemisphere of the limiting component with the locking blocks, the lighting lamp can be installed simply by pushing it upwards. Pushing the lighting lamp upwards again releases the limiting component, allowing it to be removed. Two upward pushes are sufficient for both installation and removal of the lighting lamp, making it faster than existing technologies and minimizing the swaying of the worker's body during installation.

The utility model provides a kind of drill pipe with righting assembly and applicable to multi-caliber drilling, the drill pipe with righting assembly and applicable to multi-caliber drilling includes multi-section drill pipe and righting assembly, righting assembly is equipped at the connecting place of two adjacent sections drill pipe, the righting assembly includes sleeve and coarse diameter joint, the coarse diameter joint is fixedly connected with two adjacent sections drill pipe, the sleeve is equipped above the coarse diameter joint and is sleeved on the drill pipe, the outer diameter of the sleeve is greater than the outer diameter of the coarse diameter joint. The drill pipe with righting assembly and applicable to multi-caliber drilling of the utility model embodiment, by setting righting assembly to limit the movement of drill pipe, the swing amplitude of drill pipe can be effectively reduced, so as to avoid the drill pipe in drilling to be waveform bending, reduce the probability of broken rod condition, improve the safety of construction.

The utility model belongs to hoisting equipment technical field, and disclose a kind of steel structure processing hoisting equipment, including bottom plate, the upper surface of bottom plate is fixedly connected with portal frame, hoist body is installed on portal frame, the inboard of portal frame is fixedly connected with mounting seat, the lower surface of mounting seat is fixedly connected with motor, the output of motor is fixedly connected with screw rod, screw rod is threadedly connected with threaded block, the outer surface of threaded block is fixedly connected with mounting plate, the outer surface of mounting plate is fixedly connected with electric telescopic rod, the end of electric telescopic rod away from mounting plate is fixedly connected with adjustable clamp, the upper surface of bottom plate is fixedly connected with four support rods, by the cooperation of motor, screw rod, threaded block, electric telescopic rod and adjustable clamp, after hoisting, certain force's clamping work piece, its guiding effect and certain supporting effect can be played, can reduce the shaking and swing of work piece, reduce operation difficulty, make hoisting process operation more easily control.

The utility model relates to bridge construction technical field, the utility model discloses prefabricated bridge deck system positioning installation equipment, including U type connecting seat, the top of U type connecting seat is fixed with the handle, clamping mechanism, install on the U type connecting seat, for clamping and fixing this equipment on the laying spare, clamping mechanism includes: first electric push rod, is provided with two groups, and is fixedly installed respectively on the both sides of U type connecting seat, clamping plate, fixedly installed the output end of first electric push rod, this prefabricated bridge deck system positioning installation equipment, through the synergies of clamping mechanism and positioning guide mechanism, can effectively reduce the swing of laying spare U type groove seat due to environmental factors, such as wind force, ensure that the installation position of U type groove seat is accurate on the both sides of bridge deck, this greatly improves the installation accuracy, and reduces the adjustment time in the installation process, thereby the efficiency of entire installation flow is improved significantly.

This utility model discloses a tank support device for a skid-mounted gas station, specifically relating to the field of skid-mounted gas station technology. It includes a base, a tank mounted on top of the base, two positioning components installed at the top of the base, and a support mechanism mounted on the base. Each positioning component includes a positioning ring, which is welded and fixed to the outer side of the tank. Two positioning blocks are fixedly connected to the outer side of the positioning ring, with positioning holes at the bottom of each block and two slots on the outer side. A lifting lug is welded to the top of the positioning ring. This utility model, by setting up positioning components and a support mechanism, provides multiple positioning options in front of the tank, ensuring consistent tank installation position each time, reducing offset during installation, and improving installation accuracy. Simultaneously, it forms a three-dimensional frame structure on the outer side of the tank, effectively reducing tank sway and the risk of overturning due to center of gravity shift, thus enhancing structural stability.

This invention discloses a heavy-duty anti-sway dual-winch synchronous lifting tower crane device and its control method, belonging to the technical field of construction equipment. Addressing the problems of existing tower cranes with single-winch single-lifting structures, such as easy swaying during long load lifting, poor adaptability to non-irregularly shaped loads, low synchronous control accuracy, and insufficient operational stability, this invention's device includes a lifting frame, tower crane boom, a first lifting module, a second lifting module, wire rope, a first winch module, a second winch module, hooks, a fixed platform, and a rotating platform. It is equipped with a dedicated synchronous anti-sway control method, which uses the dual winch modules to coordinate and synchronously wind up and down the rope, achieving traction and sway suppression at both ends of long loads. The winch speed can also be independently adjusted, and the height of the two hooks can be differentiated to adapt to the lifting of non-irregularly shaped loads. This invention combines optimized equipment structure with intelligent synchronous anti-sway control. Components are neatly numbered, and the platform layers do not interfere with each other. It offers stable operation and strong lifting adaptability, suitable for various high-altitude heavy-duty lifting operations in construction, significantly improving lifting stability, operational efficiency, and construction safety.

The utility model provides a kind of sofa headrest folding frame, including folding mechanism, folding mechanism includes support, support is provided with connecting rod assembly, front support rod, rear support rod and folding seat, front support rod and rear support rod are installed on connecting rod assembly, with connecting rod assembly and move, folding seat is installed on front support rod and rear support rod, folding seat is installed on front support rod and rear support rod, front support rod and rear support rod are respectively hinged with folding seat, and front support rod is hinged with folding seat in the first position of folding seat, rear support rod is hinged with folding seat in the second position of folding seat, front support rod has the front bending portion that is bent back, rear support rod has the rear bending portion that is bent forward, connecting rod assembly moves, drives front support rod and rear support rod to move, second position rotates relative to first position, folding seat unfolds or folds.The folding seat of the utility model product is used to install the headrest of sofa seat, can both stand up headrest, can also fold back headrest to lie flat, and front support rod and rear support rod occupy small movable space.

The application discloses an ultrasonic catheter and an ultrasonic device, and relates to the technical field of medical devices. The ultrasonic catheter comprises a pipe body and an ultrasonic probe. The ultrasonic probe is connected to the distal end of the pipe body. The pipe body comprises a first pipe and a second pipe. The distal end of the first pipe comprises a deflection section. The deflection section can be controlled to bend so as to change the spatial orientation of the working surface of the ultrasonic probe. The second pipe is coaxially arranged with the first pipe. The second pipe can be driven to rotate circumferentially so as to drive the working surface of the ultrasonic probe to rotate relative to the first pipe. The ultrasonic probe is bent along with the first pipe and rotates along with the second pipe, thereby emitting ultrasonic waves in multiple directions of spatial orientation. The ultrasonic catheter is controlled to bend through the deflection section and to rotate through the second pipe, thereby effectively solving the problem that the ultrasonic catheter in the prior art cannot simultaneously realize deflection and rotation functions.

The utility model discloses an unmanned plane aerial surveying and mapping device relates to unmanned plane technical field, the utility model discloses an unmanned plane body, the unmanned plane body bottom is provided with surveying and mapping camera, the unmanned plane body bottom is provided with automatic leveling mechanism, and the automatic leveling mechanism includes the installation shell of setting in the unmanned plane body bottom, the rotating stand of fixed connection in the installation shell top, and the counterweight of fixed connection in the installation shell one side. The utility model discloses through the cooperation of automatic leveling mechanism and counterweight, can dynamic adjustment surveying and mapping camera's horizontal state in the unmanned plane flight process, ensures that the picture always is perpendicular to the ground, effectively reduces image tilt and distortion, significantly improves surveying and mapping precision, and the airbag, catheter and check valve design in the stop gear, can buffer swing in the leveling process, prevent the shaking caused by gas backflow, further enhance the stability of camera in dynamic adjustment.

This invention relates to the field of airborne geophysical exploration, and more particularly to an intelligent monitoring and predictive guidance method for helicopter-towed pods. This method involves arranging multiple GPS arrays on the flexible structure of the pod, fusing airborne GPS, radar altimeter, attitude sensor, video, and meteorological data to construct a pod oscillation model incorporating structural modes and identifying deformation parameters online. A multi-model adaptive fusion framework is established, employing extended Kalman filtering and a Bayesian weight update mechanism to achieve state estimation. The spatial wind field gradient is inverted and injected into the forced pendulum dynamics equation to predict the trajectory, calculating the ground contact risk index to trigger graded alarms. Pilot cognitive load is assessed based on eye-tracking and joystick spectral analysis, dynamically simplifying the guidance interface. Lateral / longitudinal oscillation patterns are identified in the body coordinate system, generating differentiated control commands. This invention achieves intelligent monitoring and predictive guidance of the pod's state, improving flight safety and data quality.

The utility model discloses a gun drill guiding auxiliary device of promoting pressure injection rod deep hole machining precision belongs to gun drill processing technical field, including auxiliary frame, the auxiliary frame upper surface rotationally connected with the fixed frame, and the auxiliary frame upper surface slidingly connected with the lower guide block, and the lower guide block upper end slidingly connected with the upper guide block, and the upper guide block outside is pasted with the fixed frame inner wall simultaneously, the upper guide block inside is all set up with the lower guide block inside connection groove, and the connection groove surface fixedly connected with the reinforcing rib. The gun drill guiding auxiliary device of promoting pressure injection rod deep hole machining precision, through setting up the auxiliary frame and the fixed frame, effectively avoid the gun drill and appear deviation when initial drilling, from the machining starting stage just has guaranteed the position precision of deep hole machining, restricts the displacement of gun drill in each direction simultaneously, controls position deviation in the extremely small range, effectively reduces the accumulation of position deviation, guarantees the straightness and cylindricity of deep hole machining.

This utility model discloses a horizontal movement hook for a vertical wire rod mill, including a hook body, a hook seat at one end of the hook body, a baffle at the upper end of the hook seat, bolts threaded to both sides of the upper end of the baffle, washers fitted on the outer walls of the bolts, and a set of washers movably connected to one side of the hook seat. The protective mechanism effectively prevents the hook from falling off due to misoperation or external force during operation, reducing wear on the hook and ensuring operator safety. Simultaneously, the protective mechanism simplifies the disassembly and installation of the hook, improving work efficiency. The locking mechanism, with the cooperation of the swing shaft, stop arm, and torsion spring, ensures the stability and reliability of the hook during use, reducing swaying and noise caused by equipment vibration, achieving multiple functions and convenient operation.

This utility model discloses a coating machine that facilitates uniform coating, relating to the field of coating machine technology. The utility model includes a base and a coating assembly; the coating assembly includes two support plates fixed to the base, a connecting plate between the two support plates, a glue applicator slidably fitted to the bottom of the connecting plate, a sliding plate slidably fitted inside the support plates, a guide roller rotatably fitted between the two sliding plates, a scraper engaging between the two sliding plates, and a positioning plate engaging inside the support plates, one end of the positioning plate located inside the sliding plates. This utility model, by setting a cooperative structure of guide roller and scraper between the two sliding plates, with the guide roller rotatably connected to the sliding plates via a rotating rod, can rotate with the movement of the substrate and provide guidance, and the scraper is fixed between the two sliding plates by a locking block engaging a slot. With the auxiliary guidance of the guide roller, the scraper maintains a vertical state during coating, reducing the problem of substrate tilting.

The application discloses a bone conduction earphone, which comprises two earphone heads (1), two warehouse bodies (2), ear hanging lines (3) connected between the earphone heads (1) and the warehouse bodies (2), and neck wearing lines (4) connected between the two warehouse bodies (2). When the neck wearing line (4) is in a horizontal state, the warehouse body (2) extends vertically downward or extends downward and inclines toward the side where the earphone head (1) is located. In the application, the center of gravity of the warehouse body is closer to the fulcrum where the ear hanging line contacts the ear, the center of gravity of the whole bone conduction earphone is closer to the front, the tendency of the bone conduction earphone to swing around the fulcrum during movement is inhibited, the swing amplitude is reduced, the bone conduction earphone is more stable and reliable when worn on the head, and the use experience is better.

This utility model relates to the field of civil engineering technology, specifically to an anti-overturning vibration isolation building. The utility model includes a vibration isolation building body supported on a foundation by elastic vibration isolation devices, and also includes an external support structure and an anti-overturning structure. The external support structure includes soil and rock around the vibration isolation building body, a retaining wall, or an external support structure fixedly connected to the foundation. The anti-overturning structure includes at least two layers of horizontal elastic support groups arranged vertically between the vibration isolation building body and the external support structure. Each horizontal elastic support group includes multiple horizontally spaced elastic support devices. This utility model can significantly improve the safety and reliability of the vibration isolation building body during earthquakes, has excellent vibration and seismic control performance, and features a simple structure, good economy, high cost-effectiveness, and high safety and reliability. It can be widely applied in various vibration isolation building projects with external support structures.

This invention relates to the field of 3D printing technology, and in particular to a 3D printer with a fully enclosed infrared constant temperature cavity, including a printer body, a gantry set inside the printer body, and an extruder movably mounted on the gantry. The gantry has a built-in transmission system for driving the extruder to move laterally and longitudinally inside the printer body. A forming platform is provided at the bottom of the gantry, which is driven by the transmission system to move up and down. This invention realizes the reciprocating swing motion of the swing plate and swing ring through the swing heating component, so that the annular heating tube and the long strip heating tube can dynamically radiate the side area of ​​the forming platform in layers and at multiple angles. The fixed-point temperature compensation component is always accurately aligned with the extruded material to ensure the continuity and accuracy of temperature compensation, which significantly improves the printing quality and success rate. The turbulence temperature control component makes the infrared heat radiation continuously dispersed by the rotating turbulence plate and evenly cover all areas of the bottom of the forming platform.

The utility model relates to galvanization equipment technical field, and specifically is a kind of iron galvanized workpiece hoist and use fixing device, including mobile base, crosspiece, branch and branch B, mobile base one side is equipped with motor A, the position of mobile base inside one side corresponding motor A is installed reciprocating screw rod A by pivot, the position of mobile base other side corresponding reciprocating screw rod A is fixed slide rail A by bolt, reciprocating screw rod A and slide rail A between being equipped with support plate, support plate top is equipped with hydraulic cylinder, the top drive end welding of hydraulic cylinder has electric rotary disc.Motor B drives slide sleeve B to rotate to drive left hook to move relatively along slide rail B and right hook, to adjust the interval between, to hook up different sizes of iron galvanized workpiece, the anti-skid coating of polyurethane material can reduce the swing amplitude of galvanized workpiece, avoids workpiece to slip.

A special crane for transporting precast concrete box culverts for subways includes a crane frame, a lifting trolley at the top of the crane frame, a lifting mechanism at the top of the lifting trolley, symmetrically arranged outriggers at the bottom of the crane frame, a trolley traveling mechanism at the bottom of the lower beam, and a lifting device below the lifting trolley. The lifting device includes an upper lifting frame, a movable pulley assembly at the top of the upper lifting frame, the movable pulley assembly being connected to the lifting mechanism of the lifting trolley via a wire rope, a lower lifting frame below the lifting mechanism, a slewing mechanism between the lower and upper lifting frames, a support frame below the lower lifting frame, the top of the support frame being fixed to the lower lifting frame, and sliding beams slidably mounted on the support frame. The outer ends of the sliding beams are equipped with claws for engaging the precast concrete box culverts, and the support frame is equipped with a drive mechanism for driving the four sliding beams to slide. This invention has a simple structure and is easy to use.