179 results about "Lifting capacity" patented technology

A hybrid system for drones and other modes of transport. A combustion engine provides range and / or lifting capacity for drones while electric motors / generators provide both control and maneuverability. One or more combustion engines, in conjunction with one or more electric motors / generators form a propulsion system whereby each is connected to and drives its own driving pinion in one or more planetary gear sets, and provide continuously variable transmission for driving propellers or driveshafts. The combustion engine may be connected directly to one of the planetary gear's driving pinions, or can drive one of the planetary gear's driving pinions. If the propellers are only driven by either a combustion engine, or an electric motor / generator, the other engine / motor will be kept at rest by a braking device for a combustion engine or a braking device for an electric motor / generator.

The invention discloses a weldless integral high-strength feeding drill rod and a preparation method thereof. The drill rod comprises a female connector, an elevator groove, a thick-wall slip clamping section, a drill rod pipe body and a male connector which are integrally formed and have the same inner diameter. The drill rod is manufactured by integrally machining a solid bar or a thick-wall pipe body. The yield strength of the drill rod pipe body, the yield strength of the thick-wall slip clamping section and the yield strength of the elevator groove are 135 ksi-180 ksi, and the yield strength of the male connector and the yield strength of the female connector are 130 ksi-150 ksi; the outer diameter of the thick-wall slip clamping section is larger than that of the drill rod pipe body; the outer diameter of the elevator groove is smaller than that of the clamping section of the thick-wall slip; the outer diameter of the elevator groove is not smaller than that of the drill rod pipe body. The outer diameter of the connector does not need to be obviously increased, meanwhile, enough elevator lifting capacity is guaranteed, and the problem of poor structure performance caused by friction welding seams and welding area heat treatment is avoided. Complicated welding, postweld heat treatment and other procedures are omitted, the possibility that a weld joint serves as a performance weak link is avoided, higher comprehensive tensile mechanical performance is achieved, and the method is suitable for well drilling application of extra-deep wells, ocean deep wells and the like.

The present invention discloses a method for offshore construction of an extra-large single pile: by using a full-rotation crane vessel, a jack-up pile-stabilizing platform, a set of main hoisting ropes of a balance beam, and a set of auxiliary hoisting ropes of a pile-turning clamp, and adopting the method of single-vessel single-hook stern lifting, the offshore construction of the extra-large single pile is realized. Among them, the main and auxiliary hoisting riggings of the single pile are installed by berthing the transport ship parallel to the crane vessel, and the transport ship is rotated to the stern position convenient for the crane vessel to lift through the main hoisting machine and cable ropes of the crane vessel, so as to realize the lifting, turning over and pile driving of the extra-large single pile, giving full play to the construction flexibility of the crane of an ordinary full-rotation crane vessel and the lifting capacity of the fixed stern lifting of the crane, alleviating the contradiction of the shortage of construction vessels and machinery for extra-large single piles in China, and optimizing the single-pile construction process to improve work efficiency.

The invention provides a segmented vertical assembly method and system for a jacket, and the method comprises the steps: building a plurality of segments of the jacket in a horizontal assembly manner, and splitting the segments according to the maximum lifting capacity of a tower; and for each section, the lifting points on the two sides of the section are controlled through the first tower and the second tower, so that the section is turned over from the horizontal type to the vertical type, if the section is the first section, the section is placed at the storage position, otherwise, the section is in butt joint with the assembly body located at the storage position till assembly of all the sections is completed, and the jacket is obtained. And the assembled body is an assembled segment combination. The requirements for reducing the construction cost, reducing the construction operation risk, improving the construction efficiency and improving the construction weight of the jacket can be met at the same time.

The invention provides a wave rider capable of vertically ascending and descending, and belongs to the technical field of wide-speed-range aircrafts, the wave rider specifically comprises a front edge shock wave generating surface, a central fuselage and sweepback wings located on the two sides of the central fuselage, the two sweepback wings are provided with mounting holes penetrating through the upper surface and the lower surface of the wave rider, and lift fans are mounted in the mounting holes; the lift fans are embedded into the mounting holes and used for providing vertical lift force for the wave rider, the axes of the lift fans are parallel to the vertical axis of the wave rider, and the lift fans on the two sweepback wings are symmetrically distributed on the two sides of the central fuselage. According to the treatment scheme, the vertical lifting capacity is provided for the wave rider, and the high-speed flight aerodynamic performance is considered.

The invention provides a half-through concrete filled steel tube arch bridge lattice beam construction method, which optimizes the division of construction segments of a lattice beam, prevents the lattice beam from being installed in place by avoiding arch ribs and cross brace structures among the arch ribs, and enables each construction segment of the lattice beam, especially an arch rib intersection segment, to move to an installation position through horizontal and vertical displacement. Therefore, the arch rib intersection section does not need to be inclined at a large angle to penetrate through the arch rib, and the construction risk caused by unbalanced stress of a lifting point or no stress of the lifting point in the large-angle inclined lifting process of the arch rib intersection section is avoided. And meanwhile, the hoisting capacity is designed by combining with a cable crane, the total number of construction segments of the lattice beam is reduced by dividing the optimized lattice beam segments, the hoisting frequency is reduced, the weight of the construction segments of the lattice beam is close to that of the arch rib segments, and then the construction efficiency is improved, and the construction cost is reduced.

The invention provides a deep-sea self-propelled and self-elevating offshore wind power installation ship and a design method thereof. The installation ship comprises a main ship body, a ship body and a ship body, wherein the main ship body is in streamline design; the lifting system comprises pile legs, pile shoes, trunk and guide structures, pile holding chambers and pile holding lifting equipment, the four sets of trunk and guide structures are arranged at the four corners of the main ship body respectively, one pile leg is arranged in each trunk, the pile holding chambers and the pile holding lifting equipment are connected to the upper portions of the pile legs, and the pile shoes are connected to the bottoms of the pile legs; the length of the pile leg is greater than or equal to 130m; the hoisting capacity of the main hoisting equipment is 1600 t, the hoisting height is 175 m, the main hoisting equipment is combined with one lifting system, and a trunk and a guide structure are used as a supporting structure of the hoisting equipment; except for the occupation of the lifting equipment and the bow residential area, the rest deck surface of the main hull adopts a plane design, the area of the deck is greater than or equal to 3400m < 2 >, and the deck is reinforced according to the uniformly distributed load of 15t / m < 2 >. The sailing resistance can be reduced, and the sailing capability can be improved; the problems of operation water depth and insufficient lifting capacity are solved.

The invention provides an excavator hoisting threshold acquisition method and a hoisting alarm method. The method comprises the following steps: acquiring attitude data of a current attitude of an excavator; according to the posture data and the weight data of the multiple parts of the excavator, the tipping load of the excavator is obtained; according to the posture data, the weight data and oil cylinder parameters of the movable arm oil cylinder, the hydraulic lifting value of the movable arm oil cylinder is obtained; and according to the tipping load and the hydraulic lifting value, the lifting threshold value of the excavator is obtained. According to the method, the lifting threshold value can be obtained by combining the postures of all the parts of the excavator according to the actual application scene, the flexibility of obtaining the lifting threshold value is improved, and the lifting capacity of the excavator is improved.

The invention relates to a lifting ring tilting device and a top drive drilling system, the lifting ring tilting device comprises a rotating head, a fixing assembly, an oil cylinder assembly and two lifting rings, the two lifting rings are oppositely installed on the two sides of the rotating head, and the upper ends of the two lifting rings are rotationally connected with the rotating head; the fixing assembly is fixedly installed on the rotating head, and the oil cylinder assembly is fixedly installed on the fixing assembly, rotationally connected with the two lifting rings through the inclining assembly and used for driving the two lifting rings to incline. The tilting device has the beneficial effects that the structure is compact, the design is reasonable, the lifting capacity of the tilting device can be improved, and the problem that the boundary dimension of an existing tilting device is increased along with the increase of the bearing capacity is effectively solved.

The utility model discloses a cotton topping self-propelled vehicle which comprises a vehicle body, a topping device and a control device. The power driving device is arranged on the vehicle body and is in transmission connection with the wheel group; the lifting device is arranged on the vehicle body, and a topping operation module is arranged on the lifting device; the topping operation module moves along with the vehicle body, topping operation does not need to be conducted through traction of a tractor, and meanwhile the lifting device can enable the topping operation module to have the overall lifting capacity. And when the cotton tops of different land parcels or different positions of the same land parcels have large height difference caused by various factors such as water, fertilizer and illumination when the cotton is planted in a field, the adaptability is higher.

The application discloses a hoisting method for an ultra-high superstructure unit section of an ultra-large container ship, and is mainly used for hoisting the complete superstructure unit section of the ultra-large container ship. The method solves the problems of the interference and the ultra-highness of the superstructure after the structure of the superstructure is completed, and ensures the safety of hoisting the superstructure under the premise of the complete structure by means of reasonable hoisting methods and strengthened design under the condition that the lifting capacity and lifting height of the gantry crane are limited. The hoisting scheme comprises a lifting ring on a cab deck, structure strengthening, temporary strengthening and a steel wire rope of the gantry crane. The application can solve the problem of the structural integrity of the superstructure, shorten the dock period, reduce the high-altitude operation, and ensure the safety of hoisting the ultra-high superstructure.

The invention relates to the technical field of data simulation analysis, in particular to a simulation data driving-based loader load process prediction method. The method comprises the following steps that a loading lifting capacity optimization mechanical relation model is established based on structure parameters of the skid steer loader; establishing a multi-domain loader oil way-dynamics simulation coupling model; and carrying out loading machine lifting mechanical collaborative optimization processing on the multi-domain loading machine oil way-dynamics simulation coupling model through the loading lifting capacity optimization mechanical relation model so as to obtain a loading machine working condition multi-domain collaborative simulation model. Transmitting the loading machine working condition multi-source load data to a loading machine working condition multi-domain collaborative simulation model to analyze loading machine multi-domain collaborative simulation load process characteristic data; and based on the loader multi-domain collaborative simulation load history characteristic data, establishing a loader multi-domain collaborative precision optimization load history prediction mapping relationship, and generating an optimized loader multi-domain collaborative load history prediction model. According to the invention, accurate prediction of the loading process of the loader is realized.

According to the intelligent positioning method for tower crane type selection and site visual arrangement, the working efficiency of tower crane scheme compiling personnel is greatly improved through visual hoisting requirements and tower crane hoisting capacity, the visual arrangement process of the tower crane is intelligently optimized based on a genetic algorithm improved by engineering priori knowledge, and the working efficiency of the tower crane scheme compiling personnel is greatly improved. The scheme with the lowest price is found while the lifting capacity requirement is met and space collision is avoided.

The invention discloses a large-lifting-capacity multi-claw lifting hook and an assembling method and a detecting method thereof, and belongs to the technical field of lifting hooks. The large-lifting-capacity multi-claw lifting hook comprises a lifting rod, and a thrust self-aligning roller bearing is installed on the lifting rod; the hook body comprises a hook body and a hook tip, and the hook body and the hook tip are welded; the thrust self-aligning roller bearing supports the hook body, the self-aligning roller bearing is installed on the hook body, the suspender penetrates through the self-aligning roller bearing and the center of the hook body, and the hook body rotates relative to the suspender. And the large lifting capacity is more than 3500t. According to the invention, the large-lifting-capacity multi-claw lifting hook can be assembled and detected.

The invention relates to the technical field of bridge engineering, and discloses a bridge prefabricated box girder hoisting method and a hoisting positioning device.The bridge prefabricated box girder hoisting method comprises the following steps that S1, a box girder is placed on a transport trailer, and the transport trailer is moved to a bridge head; s2, a main crane and an auxiliary crane are adopted for cooperative operation, the rated lifting weight of the main crane is larger than that of the auxiliary crane, and the main crane and the auxiliary crane both stay at a bridge head; s3, the main crane is used for hoisting the far end of the box girder relative to the bridge head, the auxiliary crane is used for hoisting the near end of the box girder relative to the bridge head, the main crane bears the main hoisting moment, the auxiliary crane assists in adjusting the posture of the box girder, and the box girder is hoisted to the designated position; in the hoisting process, the total station is used for monitoring the axis deviation of the box girders relative to the supports and the height difference of the adjacent box girders in real time. The adverse effect of box girder installation on river passage can be reduced.

The utility model discloses a manual and electric chain hoist which comprises a shell, a five-tooth long shaft and a driving assembly. The five-tooth long shaft is rotationally installed on the shell and lifts a heavy object through rotation of the first side. The driving assembly is installed on the second side of the five-tooth long shaft, and the driving end of the driving assembly extends out of the shell. An actuating piece outside the shell drives the driving end in a manual or electric mode so as to drive the five-tooth long shaft to rotate. The lifting device has the beneficial effects that the driving assembly is driven by the external actuating piece to rotate the five-tooth long shaft, and the driving force arm can be adaptively changed according to the lifting requirement so as to improve the lifting capacity. Meanwhile, manual operation is changed into electric operation under the condition that the operation working condition of the chain hoist is not changed, the working efficiency can be effectively improved, the labor intensity can be effectively relieved, and meanwhile a traditional mechanism can be optimized.

The invention discloses a multi-stage gripper shoe type chambering vertical shaft heading machine, and belongs to the technical field of vertical shaft heading. The equipment comprises a tunneling module used for reaming excavation of a vertical shaft; the lining module is arranged above the tunneling module and used for subsequent pouring lining of the wall face of the vertical shaft, and the lining module comprises a step changing unit; the rear matched supporting columns are arranged between the tunneling module and the lining module, and the rear matched supporting columns are used for connecting the tunneling module and the lining module and providing supporting points for descending and propelling of the subsequent lining module; according to the invention, during the tunneling process, the weight of the lining module is directly transmitted to the double-layer gripper shoe assembly in the tunneling module through the rear supporting column, so that the requirement on the hoisting capacity of a wellhead is reduced, and the well wall lining support closely follows the excavation operation, so that the bareness time of surrounding rock is shortened; in the step changing process, the weight of the tunneling module is borne by the lining module and does not depend on the integrity and strength of the rock stratum in front of the cutterhead any more, and the construction safety is improved.

The invention discloses a lifting system and a loading and unloading lifting machine, and relates to the technical field of lifting machines, in particular to the lifting system and the loading and unloading lifting machine, the lifting system comprises a cross beam, the near end of the cross beam is provided with a near-end guide wheel set, the far end of the cross beam is provided with a far-end guide wheel set, and the rotating shaft position of the far-end guide wheel set is provided with a pin shaft sensor; the traction rope is wound between the near-end guide wheel set and the far-end guide wheel set, the two ends of the traction rope are wound in the winding drum, and any section of the traction rope between the near-end guide wheel set and the far-end guide wheel set is wound in the combined pulley set. According to the lifting system and the loading and unloading lifting machine, the mode that the winch assembly is arranged at one end of the cross beam is adopted, the self weight of the walking trolley is reduced, the single traction rope is reused in the mode that the traction rope is turned and folded back at the far-end guide wheel set, and therefore the overall maximum lifting capacity of equipment is improved.

The present invention relates to the field of shipbuilding technology, and discloses a large pile-circling crane base, comprising a base, a mounting base disposed on top of the base, and a connecting base disposed on top of the mounting base. The bottom of the base is fixedly connected to the hull structure, and the mounting base includes three box-shaped legs, which enclose a mounting cavity for mounting a lifting device, and a mounting hole for a lifting unit assembly of the lifting device is formed between two adjacent box-shaped legs. The three box-shaped legs are respectively a first box-shaped leg, a second box-shaped leg, and a third box-shaped leg. The first box-shaped leg is a long strip box-shaped structure, and the second and third box-shaped legs are both triangular box-shaped structures, and the second and third box-shaped legs are axially symmetrical structures. The present invention can solve the problem of difficult installation and disassembly of the lifting unit assembly of the lifting device, has low overall processing difficulty, and is suitable for large pile-circling cranes with a lifting capacity of more than 2,000 tons.

The present application provides an installation method for a construction platform of an enclosure system, including building the construction platform on a bracket platform; arranging a plurality of mobile trolleys at the bottom of the construction platform, and installing a first track on the bracket platform so that the plurality of mobile trolleys can carry the construction platform and move along the first track; marking a plurality of column positioning points on the inner bottom of the liquid cargo hold and installing a second track so that the mobile trolleys can move along the second track; lifting and moving the bracket platform so that the upper surface of the bracket platform is flush with the upper surface of the inner bottom of the liquid cargo hold, and the first track is aligned with the second track; separating the bottom of the column from the bracket platform, mounting the construction platform on the plurality of mobile trolleys, sliding the mobile trolleys onto the second track so that each column of the construction platform is aligned with the corresponding column positioning point on the inner bottom of the liquid cargo hold; lowering the column and fixing it on the inner bottom of the liquid cargo hold. This method enables the overall positioning and installation of the construction platform module into the liquid hold without the need for lifting capacity.

The utility model relates to the field of petroleum and natural gas drainage and gas recovery, in particular to a gas well shaft drainage device capable of moving continuously. Comprising a device body and connecting pieces detachably and symmetrically connected with the two ends of the device body correspondingly. A first fluid channel is formed in the top of the device body, a second fluid channel is formed in the bottom of the device body, moving parts are arranged in the first fluid channel and the second fluid channel, openings communicated with the first fluid channel and the second fluid channel respectively are formed in the device body, and the moving parts move in the first fluid channel or the second fluid channel. The bypass mechanism is composed of the first fluid channel, the second fluid channel and the opening, opening and closing of the bypass mechanism are achieved by means of movement of the moving part, stability of the bypass mechanism in the operation process is guaranteed, accidental closing of the bypass mechanism in the midway is effectively prevented, and the safety of the bypass mechanism is improved. And the problem of insufficient water lifting capacity caused by bypass failure is avoided.

The invention relates to an auxiliary crane and a mounting method of an arm laying frame thereof, which comprises the following steps of: before a ship enters water, mounting a main body on a ship deck; a supporting tool is manufactured according to the theoretical height of an arm placing frame of the auxiliary crane; the supporting tool is installed to a designated position on a ship deck, and the arm placing frame is installed to the supporting tool; one end of the suspension arm is connected with the main body, and the other end of the suspension arm is folded and installed on the arm placing frame; and stringing, wiring and debugging of the auxiliary crane are completed. After the ship is launched, the arm placing frame is separated from the supporting tool; and after the arm placing frame is separated from the supporting tool, the arm placing frame is hoisted to the theoretical installation position of the ship broadside through the auxiliary crane. According to the installation method, construction operations such as fixing of the arm placing frame, installation of the suspension arm and threading of the steel wire rope can be completed before the ship is launched, and installation of the arm placing frame can be achieved through the hoisting capacity of the auxiliary crane after the ship is launched. Therefore, the overall installation procedure of the ship auxiliary crane is moved forward, the construction cost is greatly reduced, and the ship building period is shortened.

This invention provides a deep-sea self-propelled and self-elevating offshore wind power installation vessel and its design method. The installation vessel includes: a streamlined main hull design; an elevator system comprising legs, pile shoes, cofferdams and guide structures, a pile clamping chamber and pile clamping and lifting equipment; four sets of cofferdams and guide structures are respectively located at the four corners of the main hull; each cofferdam contains one leg; the upper part of the leg is connected to the pile clamping chamber and pile clamping and lifting equipment, and the bottom of the leg is connected to a pile shoe; the leg length is greater than or equal to 130m; the main crane has a lifting capacity of 1600t and a lifting height of 175m; the main crane is integrated with one of the elevator systems, utilizing the cofferdams and guide structures as the support structure for the crane; excluding the elevator equipment and the bow living area, the remaining deck surface of the main hull is designed as a flat surface, with a deck area greater than or equal to 3400m². 2 The deck is designed to withstand 15 t / m 2 The uniform load distribution is enhanced. This invention can reduce navigation resistance and improve navigation capacity; it also solves the problems of insufficient operating water depth and lifting capacity.

This application discloses a weight-controlled lifting device, belonging to the field of lifting equipment machinery. It involves adding multiple sets of winches to the top of the lifting arm, each set corresponding to a main rope. The bottom ends of these main ropes are connected to a pressure detector mounted on the hook via an upper load-bearing cable. The pressure detector measures the weight of the load lifted by the hook and compares it with the maximum lifting capacity of the winches. This allows for the selection of whether to use a single main rope or multiple main ropes in combination to drive the load, achieving reasonable lifting without overloading. The added winding roller, winding belt, and magnetic collar work together to wind up the connected main ropes. This prevents unwinded main ropes from tangling at the bottom when only a single winch or a few winches are used for winding, which could affect normal lifting. This reduces the number of times the drive equipment needs to be used and improves safety.

The utility model discloses a force limiting electric control system, and aims to provide a force limiting electric control system which solves the influence of the lifting capacity on the stability of a whole vehicle in the engineering machinery and agricultural machinery industries. The system comprises a power controller which is used for providing a stable power supply for the control system; the controller is connected with a control valve block and is electrically connected with the power controller; the operating handle is electrically connected with the controller; the force limiter is electrically connected with the controller; the force limit display is electrically connected with the controller; the big arm oil cylinder group is electrically connected with the control valve block; and the accessory oil cylinder group is electrically connected with the control valve block. The utility model has the beneficial effects that the influence of the lifting capacity on the stability of the whole vehicle in engineering machinery and agricultural machinery industries is solved, and the stability of the whole vehicle is greatly improved.

The invention discloses a multi-capacity combined type travelling crane hoist which comprises a walking track, a rack parallel to the walking track is arranged at the bottom of the walking track, a driving crane and an auxiliary crane are connected to the walking track, a connecting frame is arranged at the bottom of the driving crane and the bottom of the auxiliary crane, and a first hoist and a second hoist are arranged at the bottom of the connecting frame. An electrical control box is arranged on the side wall of the connecting frame. The invention designs a multi-capacity combined electric travelling crane hoist, two hoists share one travelling crane, have different lifting capacities and lifting speeds, and comprise main components such as a driving travelling crane, an auxiliary travelling crane, a connecting frame, a high-capacity hoist and a low-capacity hoist. Through the integrated electrically-driven crane and the connecting frame, hoists with different high and low capacities can run under one crane, the beam hanging requirement is reduced, the cost is saved, the space requirement is reduced, and furthermore, an auxiliary line remote control device is further arranged, so that different hoists can be switched at any time to lift objects and walk along a track beam.

The present invention relates to the technical field of performance testing of a ro-ro passenger ship stern ramp, and more specifically to a floating test method for testing the performance of a ship stern ramp. The performance testing floating test method comprises the following steps: (1) determining the lifting capacity of a crane according to the load lifted by the stern ramp; (2) selecting a crane; (3) determining the position of the crane and installing and moving the crane to a dock; (4) the crane lifts the stern ramp and tests it; (5) drawing a test conclusion and verifying it; and (6) ending the floating test. The above method has the advantages of being simple, having a high test accuracy, and being able to correct the stern ramp in time.

The utility model discloses a movable sliding table for carrying a mold, and belongs to the technical field of carrying devices. Comprising a walking track which is provided with a mold production station and a mold replacement station; the moving platform is movably arranged on the walking track, and the moving platform is used for bearing a mold and transferring the mold between a mold production station and a mold replacement station; and the at least two fixed platforms are symmetrically arranged on the two sides of the mold replacement station of the walking track and are respectively used for bearing a to-be-replaced mold and receiving a replaced mold. Compared with a traditional traveling crane, the movable sliding table design specially considers the carrying requirement of a large mold, it is guaranteed that the large-weight mold can be stably borne and transferred, and the problems caused by the fact that the traveling crane is limited by the lifting capacity are effectively solved.

The utility model relates to the technical field of hoisting balance beams, in particular to an adjustable rolling mill stand hoisting balance beam which comprises a balance beam body, the balance beam body is of two plate beam structures, the two sides of the balance beam body are fixedly connected through limiting check blocks, adjustable lifting lug assemblies are arranged on the outer sides of the two ends of the balance beam body in a sleeved mode, and a hoisting ring is arranged in the middle of the balance beam body in a sleeved mode. A middle groove is formed in the bottom end of the hoisting ring, butt joint grooves are formed in the two sides of the middle groove in the bottom end of the hoisting ring in a penetrating mode, connecting assemblies are arranged in the butt joint grooves, and a rolling mill rack is fixed to the bottom ends of the connecting assemblies. The connecting assembly comprises a flange plate fixed to the top end of a rolling mill rack, a rack lifting lug fixed to the top end of the flange plate and a pin shaft arranged in the middle of the rack lifting lug and in a butt joint groove in a sleeved mode, and the two-side adjustable lifting lug assembly comprises sliding lifting lugs and hook rods arranged at the top ends of the sliding lifting lugs. The rolling mill stand structure can be lifted more stably, and the problem of installation of a rolling mill with insufficient lifting capacity of a single travelling crane is solved.

The utility model discloses a dismounting-free on-load displacement counterweight device for a crane. The counterweight device comprises a vehicle body, a crane main body is mounted on the vehicle body, supporting assemblies are symmetrically arranged at the bottom end of the rear part of the vehicle body, a connecting plate is arranged on the vehicle body through an adjusting mechanism, a counterweight assembly is arranged on the connecting plate, and the connecting plate is connected with the vehicle body through a positioning assembly. The position of the counterweight assembly can be conveniently adjusted according to use requirements, the lifting capacity and stability of the automobile crane can be remarkably improved by adjusting the position of the counterweight device, the operation performance of the crane can be improved by adjusting the counterweight position, the vibration of an arm frame can be reduced by optimizing the counterweight position, and the service life of the crane is prolonged. The stability and safety of the crane are improved, the crane is relatively simple and convenient, positioning and fixing can be carried out after adjustment is completed, and firmness during use is ensured.