Lifting device for constructional engineering maintenance

Abstract

The lifting device for constructional engineering maintenance comprises an electric vehicle and a rotating box, the rotating box is installed in the center of the top end of the electric vehicle, a rotating shaft is movably installed in the rotating box and extends to the outside of the rotating box, a turnover frame is installed at the top end of the rotating shaft, and the turnover frame is movably installed in the rotating box. An inner frame is movably mounted at the top end of the overturning frame, an outer frame is mounted in the inner frame, and a connecting block is arranged outside the inner frame. According to the device, the maintenance position can be conveniently and rapidly adjusted in a transverse moving and circumferential rotating mode, the device is folded and stored in a deflection mode, flexible transverse moving adjustment and large-range maintenance operation during maintenance operation are facilitated, and the transverse moving convenience and the moving and carrying convenience of the device are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lifting devices, and particularly relates to a lifting device for building engineering maintenance. Background Technique

[0002] Over time, various problems will inevitably occur in buildings, and building engineering maintenance has become an essential task. As a place for human production and life, buildings carry important functions and significance. During the long-term use of buildings, various problems often occur. If these problems are not repaired in a timely manner, it will not only affect the normal use of the buildings, but also may cause huge losses to people's lives and property. Regular maintenance can extend the service life of buildings. Various problems will occur in normally used buildings after a certain period of time. Regular maintenance and replacement can delay the occurrence of these problems and extend the service life of buildings. Maintenance can also reduce maintenance costs because timely minor repairs can avoid subsequent larger-scale and more expensive repair work.

[0003] As disclosed in a lifting device for building engineering maintenance with the authorization publication number of CN213679699U, which includes a box body, moving wheels, a switch door, a support plate, a fixed column and an auxiliary support rod. Moving wheels are fixedly installed on both sides of the bottom end of the box body. A lifting mechanism is arranged inside the box body. A support plate is arranged at the top end of the box body. A fixed column is fixedly installed in the middle of the upper end of the support plate. An auxiliary support rod is installed at the top of the fixed column. A workbench is installed at the top of the auxiliary support rod. A lifting guardrail is arranged at the upper end of the workbench. A plurality of safety buckles are arranged around the upper surface of the lifting guardrail;

[0004] Although it realizes the lifting adjustment of the height of the workbench and the lifting guardrail, making it applicable to building engineering maintenance sites with different heights, improving its scope of use and increasing the use effect;

[0005] However, it does not solve the problem that the existing lifting devices are not convenient for convenient lateral movement and circumferential rotation to adjust the maintenance position, and folding and storing the device in a deflection manner is not convenient for flexible lateral movement adjustment and large-scale maintenance operations during maintenance work, greatly affecting the convenience of the device's lateral movement and the convenience of moving and carrying. Content of the Utility Model

[0006] The purpose of the utility model is to provide a lifting device for building engineering maintenance, so as to solve the problem proposed in the above background technique that the lifting device is not convenient for convenient lateral movement and circumferential rotation to adjust the maintenance position, folding and storing the device in a deflection manner is not convenient for flexible lateral movement adjustment and large-scale maintenance operations during maintenance work, and affecting the convenience of the device's lateral movement and the convenience of moving and carrying.

[0007] To achieve the above object, the present utility model provides the following technical solution: a lifting device for building engineering maintenance, including an electric vehicle and a rotating box. A rotating box is installed at the central position of the top end of the electric vehicle. A rotating shaft is movably installed inside the rotating box, and the rotating shaft extends to the outside of the rotating box. A flipping frame is installed at the top end of the rotating shaft. An inner frame is movably installed at the top end of the flipping frame. An outer frame is installed inside the inner frame. Connecting blocks are arranged outside the inner frame. Slide frames are symmetrically and slidably sleeved on the outer wall of the outer frame. First arms are symmetrically arranged between the inner frame and the connecting blocks. Second arms are symmetrically arranged between the inner frame and the connecting blocks on one side of the first arms. Right clamping shafts are movably installed at one ends of the first arms close to the slide frames, and the first arms are connected to the slide frames through the right clamping shafts. The bottom ends of the second arms are movably connected to the inner frame. Hinge shafts are movably installed at the central positions of the outer walls of the first arms, and the first arms are movably connected to the second arms through the hinge shafts. A cross frame is slidably installed on one side of the connecting block close to the inner frame. Left clamping shafts are movably installed at the top ends of the second arms on one side of the cross frame, and the second arms are movably connected to the cross frame through the left clamping shafts. Four groups of walking wheels are installed at equal intervals at the bottom end of the electric vehicle.

[0008] Preferably, chutes are symmetrically arranged on the side walls of the connecting blocks on one side of the cross frame. Sliders are slidably installed inside the chutes, and the sliders extend to the outside of the chutes, and the sliders are connected to the cross frame. A lower fork arm hoist is installed on the outer wall of the connecting block far from the second arm. An upper fork arm hoist is installed at the top end of the lower fork arm hoist. A workbench is installed at the top end of the upper fork arm hoist.

[0009] Preferably, four groups of telescopic sleeves are arranged at equal intervals on the outer wall of the electric vehicle below the rotating box. Power shafts are movably installed at one ends of the telescopic sleeves close to the electric vehicle, and the electric vehicle is movably connected to the telescopic sleeves through the power shafts.

[0010] Preferably, locking bolts are arranged at the top ends of the electric vehicles on one side of the power shafts, and the locking bolts extend to the surface of the telescopic sleeves. Lower electric push rods are installed at the ends of the telescopic sleeves far from the electric vehicle. Brake blocks are installed at the bottom ends of the lower electric push rods.

[0011] Preferably, left electric push rods are symmetrically and movably installed on the side walls of the inner frame on one side of the second arms. Left linkage shafts are movably installed at the output ends of the left electric push rods, and the output ends of the left electric push rods are movably connected to the second arms through the left linkage shafts.

[0012] Preferably, a stepping motor is installed inside the rotating box above the electric vehicle. A worm is installed at the output end of the stepping motor.

[0013] Preferably, a worm gear is installed inside the rotating box on one side of the worm, and the worm gear meshes with the worm, and the top end of the worm gear is connected to the rotating shaft.

[0014] Preferably, right electric push rods are symmetrically and movably installed at the top end of the flipping frame, the output ends of the right electric push rods are all movably installed with right linkage shafts, and the output ends of the right electric push rods are all movably connected to the outer frame through the right linkage shafts.

[0015] Preferably, support shafts are symmetrically and movably installed at the bottom end of the inner frame, and the flipping frames are all movably connected to the inner frame through the support shafts.

[0016] Preferably, a remote controller is installed on the side wall of the rotating box above the electric vehicle, and the output end of the remote controller is electrically connected to the input ends of the electric vehicle, the lower fork arm hoist, the upper fork arm hoist, the left electric push rod, the right electric push rod, the stepping motor, and the lower electric push rod.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows: The lifting device not only realizes convenient lateral movement type and circumferential rotation type adjustment of the maintenance position, deflects and folds and stores the device, which facilitates flexible lateral movement adjustment during maintenance operations and large-scale maintenance operations, but also improves the convenience of lateral movement of the device and the convenience of movement and carrying of the device;

[0018] (1) The left electric push rod drives the second arm to rotate around the left clamping shaft through the left linkage shaft, the inner frame movably supports the second arm, at the same time the second arm drives the cross frame to slide upward through the left clamping shaft, the cross frame drives the slider to slide upward inside the chute, the second arm drives the first arm to rotate through the hinge shaft, the connecting block movably supports the first arm, the first arm drives the sliding frame to rotate around the right clamping shaft through the right clamping shaft, the first arm drives the sliding frame to slide upward along the surface of the outer frame through the right clamping shaft, and the connecting block drives the lower fork arm hoist, the upper fork arm hoist, the workbench and the maintenance personnel to move inward to the inner frame, so as to conveniently move the maintenance personnel laterally to the next position for maintenance operations, realizing convenient lateral movement type adjustment of the position for maintenance operations of the lifting device for building engineering maintenance, facilitating flexible lateral movement adjustment during maintenance operations, increasing the range of lateral movement, and improving the convenience of lateral movement of the device;

[0019] (2) The stepping motor drives the worm to rotate, the worm drives the worm gear to rotate, at the same time the worm gear drives the flipping frame to rotate through the rotating shaft, and the flipping frame drives the outer frame, the inner frame, the second arm, the connecting block, the lower fork arm hoist, the upper fork arm hoist, the workbench and the maintenance personnel to rotate synchronously, so as to conveniently rotate the maintenance personnel circumferentially to the designated building position, realizing convenient circumferential rotation type adjustment of the maintenance position of the lifting device for building engineering maintenance, and facilitating large-scale maintenance operations of the maintenance device;

[0020] (3) The lower electric push rod drives the brake block to move upward until the brake block is separated from the ground. At this time, the walking wheels are in contact with the ground. The maintenance personnel remove the locking bolt inside the electric vehicle, and the locking bolt changes from pressing the telescopic sleeve and the electric vehicle to loosening them. The maintenance personnel rotate the telescopic sleeve around the power shaft to rotate the telescopic sleeve until it contacts the side wall of the electric vehicle, reducing the floor area occupied by the device after storage. The right electric push rod drives the outer frame and the inner frame to rotate around the support shaft through the right linkage shaft, so as to rotate the outer frame and the inner frame to the surface of the flipping frame. The outer frame and the inner frame drive the lower fork arm lifter, the upper fork arm lifter and the workbench to rotate synchronously through the connecting block, facilitating the folding and contraction of the device, reducing the floor space, realizing the convenient deflection type folding and storage of the lifting device for building engineering maintenance, reducing the occupied space, and improving the convenience of device movement and carrying. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a three-dimensional structure schematic diagram of the present utility model;

[0022] Figure 2 is a front view structure schematic diagram of the present utility model;

[0023] Figure 3 is a three-dimensional structure schematic diagram of the first arm of the present utility model;

[0024] Figure 4 is a three-dimensional structure schematic diagram of the right electric push rod of the present utility model;

[0025] Figure 5 is a front view sectional structure schematic diagram of the rotating box of the present utility model.

[0026] In the figure: 1, electric vehicle; 2, rotating box; 3, rotating shaft; 4, flipping frame; 5, outer frame; 6, inner frame; 7, sliding frame; 8, first arm; 9, second arm; 10, hinge shaft; 11, cross frame; 12, connecting block; 13, lower fork arm lifter; 14, upper fork arm lifter; 15, workbench; 16, telescopic sleeve; 17, brake block; 18, lower electric push rod; 19, left electric push rod; 20, right clamping shaft; 21, left linkage shaft; 22, right electric push rod; 23, left clamping shaft; 24, right linkage shaft; 25, support shaft; 26, stepping motor; 27, worm; 28, worm gear; 29, remote controller; 30, chute; 31, slider; 32, locking bolt; 33, power shaft; 34, walking wheel. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] To further elaborate on the technical means and effects adopted by the present utility model to achieve the predetermined utility model purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation manners, structures, features and their effects of the present utility model as follows.

[0028] Please refer to Figures 1-5 For an embodiment provided by the present utility model: A lifting device for building engineering maintenance, including an electric vehicle 1 and a rotating box 2. A rotating box 2 is installed at the central position of the top end of the electric vehicle 1. A rotating shaft 3 is movably installed inside the rotating box 2, and the rotating shaft 3 extends to the outside of the rotating box 2. The top end of the rotating shaft 3 is installed with a turning frame 4. The top end of the turning frame 4 is movably installed with an inner frame 6. An outer frame 5 is installed inside the inner frame 6. A connecting block 12 is arranged outside the inner frame 6. Slide frames 7 are symmetrically and slidably sleeved on the outer wall of the outer frame 5. First arms 8 are symmetrically arranged between the inner frame 6 and the connecting block 12. Second arms 9 are symmetrically arranged between the inner frame 6 and the connecting block 12 on one side of the first arms 8. Right clamping shafts 20 are movably installed at one ends of the first arms 8 close to the slide frames 7, and the first arms 8 are all connected to the slide frames 7 through the right clamping shafts 20. The bottom ends of the second arms 9 are all movably connected to the inner frame 6. Hinge shafts 10 are movably installed at the central positions of the outer walls of the first arms 8, and the first arms 8 are all movably connected to the second arms 9 through the hinge shafts 10. A cross frame 11 is slidably installed on one side of the connecting block 12 close to the inner frame 6. Left clamping shafts 23 are movably installed at the top ends of the second arms 9 on one side of the cross frame 11, and the second arms 9 are all connected to the cross frame 11 through the left clamping shafts 23. Four groups of walking wheels 34 are installed at equal intervals at the bottom end of the electric vehicle 1;

[0029] Chute grooves 30 are symmetrically arranged on the side walls of the connecting block 12 on one side of the cross frame 11. Sliders 31 are slidably installed inside the chute grooves 30, and the sliders 31 all extend to the outside of the chute grooves 30, and the sliders 31 are all connected to the cross frame 11. A lower fork arm hoist 13 is installed on the outer wall of the connecting block 12 far from the second arm 9. An upper fork arm hoist 14 is installed at the top end of the lower fork arm hoist 13. A workbench 15 is installed at the top end of the upper fork arm hoist 14;

[0030] Four groups of telescopic sleeves 16 are arranged at equal intervals on the outer wall of the electric vehicle 1 below the rotating box 2. Power shafts 33 are movably installed at one ends of the telescopic sleeves 16 close to the electric vehicle 1, and the electric vehicle 1 is all movably connected to the telescopic sleeves 16 through the power shafts 33. Locking bolts 32 are arranged at the top ends of the electric vehicle 1 on one side of the power shafts 33, and the locking bolts 32 extend to the surface of the telescopic sleeves 16. Lower electric push rods 18 are installed at the ends of the telescopic sleeves 16 far from the electric vehicle 1. Brake blocks 17 are installed at the bottom ends of the lower electric push rods 18;

[0031] Left electric push rods 19 are symmetrically and movably installed on the side walls of the inner frame 6 on one side of the second arm 9. Left linkage shafts 21 are movably installed at the output ends of the left electric push rods 19, and the output ends of the left electric push rods 19 are all movably connected to the second arm 9 through the left linkage shafts 21;

[0032] First, the maintenance personnel turn on the electric vehicle 1 by operating the remote controller 29. The electric vehicle 1 moves the device to the designated construction project location. The maintenance personnel turn on the lower electric push rod 18 by operating the remote controller 29. The lower electric push rod 18 drives the brake block 17 to move. At the same time, the lower electric push rod 18 contacts the ground. At this time, the walking wheels 34 are separated from the ground, and the brake block 17 plays an auxiliary supporting role. At this time, the maintenance personnel turn on the lower fork arm hoist 13 and the upper fork arm hoist 14 by operating the remote controller 29, and change the lower fork arm hoist 13 and the upper fork arm hoist 14 from the extended state to the retracted state to facilitate the maintenance personnel to enter the inside of the workbench 15. The models of the lower fork arm hoist 13 and the upper fork arm hoist 14 are the same as those of the fixed scissor lift of Jinan Longyu Lifting Machinery Co., Ltd. When the maintenance personnel stand on the workbench 15, they turn on the lower fork arm hoist 13 and the upper fork arm hoist 14 in reverse by operating the remote controller 29. Under the combined action of the lower fork arm hoist 13 and the upper fork arm hoist 14, the maintenance personnel are lifted to the designated height to facilitate the maintenance personnel to perform maintenance at the designated location. When it is necessary to horizontally move the position of the maintenance personnel, supported by the inner frame 6, the left electric push rod 19 is turned on by operating the remote controller 29. The left electric push rod 19 drives the second arm 9 to rotate around the left clamping shaft 23 through the left linkage shaft 21. The inner frame 6 supports the second arm 9 movably. At the same time, the second arm 9 drives the cross frame 11 to slide upward through the left clamping shaft 23. The cross frame 11 drives the slider 31 to slide upward inside the chute 30. The second arm 9 drives the first arm 8 to rotate through the hinge shaft 10. The connecting block 12 supports the first arm 8 movably. The first arm 8 drives the carriage 7 to rotate around the right clamping shaft 20 through the right clamping shaft 20. The first arm 8 drives the carriage 7 to slide upward along the surface of the outer frame 5 through the right clamping shaft 20. Under the cooperation of the second arm 9 and the hinge shaft 10, the connecting block 12 drives the lower fork arm hoist 13, the upper fork arm hoist 14, the workbench 15 and the maintenance personnel to move towards the inner frame 6 to facilitate the horizontal movement of the maintenance personnel to the next position for maintenance operations, realizing the convenient horizontal movement and position adjustment of the lifting device for construction project maintenance, facilitating the flexible horizontal movement adjustment during maintenance operations, increasing the horizontal movement range, and improving the convenience of the horizontal movement of the device;

[0033] A stepping motor 26 is installed inside the rotating box 2 above the electric vehicle 1. The stepping motor 26 plays a role in power driving. The output end of the stepping motor 26 is installed with a worm 27. A worm gear 28 is installed inside the rotating box 2 on one side of the worm 27. The worm gear 28 meshes with the worm 27, and the top end of the worm gear 28 is connected to the rotating shaft 3;

[0034] When maintenance is required at different building locations, the stepping motor 26 is turned on by operating the remote controller 29. Supported by the rotating box 2, the stepping motor 26 drives the worm 27 to rotate. Under the meshing action of the worm 27 and the worm gear 28, the worm 27 drives the worm gear 28 to rotate. At the same time, the worm gear 28 drives the turning frame 4 to rotate through the rotating shaft 3, and the turning frame 4 drives the outer frame 5, the inner frame 6, the second arm 9, the connecting block 12, the lower fork arm lifter 13, the upper fork arm lifter 14, the workbench 15 and the maintenance personnel to rotate synchronously, so as to conveniently rotate the maintenance personnel circumferentially to the designated building location, realizing the convenient circumferential rotation adjustment of the maintenance position of the lifting device for building engineering maintenance, and facilitating the maintenance device to carry out a large range of maintenance operations;

[0035] The top of the turning frame 4 is symmetrically and movably provided with right electric push rods 22. The output ends of the right electric push rods 22 are all movably provided with right linkage shafts 24, and the output ends of the right electric push rods 22 are all movably connected to the outer frame 5 through the right linkage shafts 24. The bottom ends of the inner frames 6 are symmetrically and movably provided with support shafts 25, and the turning frames 4 are all movably connected to the inner frames 6 through the support shafts 25;

[0036] A remote controller 29 is installed on the side wall of the rotating box 2 above the electric vehicle 1, and the output end of the remote controller 29 is electrically connected to the input ends of the electric vehicle 1, the lower fork arm lifter 13, the upper fork arm lifter 14, the left electric push rod 19, the right electric push rod 22, the stepping motor 26, and the lower electric push rod 18;

[0037] When the device needs to be summarized, the maintenance personnel operate the remote controller 29 to reverse-open the lower electric push rod 18. The lower electric push rod 18 drives the brake block 17 to move upward, so that the brake block 17 is separated from the ground. At this time, the traveling wheels 34 are in contact with the ground. The maintenance personnel remove the locking bolt 32 from the inside of the electric vehicle 1, and the locking bolt 32 changes from pressing the telescopic sleeve 16 and the electric vehicle 1 to loosening. The maintenance personnel rotate the telescopic sleeve 16 around the power shaft 33 to rotate the telescopic sleeve 16 until it contacts the side wall of the electric vehicle 1, so as to reduce the floor area of the device after storage. By operating the remote controller 29 to open the right electric push rod 22, supported by the turning frame 4, the right electric push rod 22 drives the outer frame 5 and the inner frame 6 to rotate around the support shaft 25 through the right linkage shaft 24, so as to rotate the outer frame 5 and the inner frame 6 to the surface of the turning frame 4. The outer frame 5 and the inner frame 6 drive the lower fork arm lifter 13, the upper fork arm lifter 14 and the workbench 15 to rotate synchronously through the connecting block 12, so as to facilitate the folding and contraction of the device, reduce the occupied space, and realize the convenient deflection type folding and storage of the lifting device for building engineering maintenance, reduce the occupied space, and improve the convenience of device movement and carrying.

[0038] Working principle: When in use, with an external power supply, first, the lower electric push rod 18 drives the brake block 17 to move. At the same time, the lower electric push rod 18 contacts the ground, and at this time, the walking wheels 34 are separated from the ground. The brake block 17 plays an auxiliary supporting role. At this time, the maintenance personnel operate the remote controller 29 to turn on the lower fork arm lifter 13 and the upper fork arm lifter 14, changing the lower fork arm lifter 13 and the upper fork arm lifter 14 from the extended state to the contracted state, to facilitate the maintenance personnel to enter the interior of the workbench 15. Under the combined action of the lower fork arm lifter 13 and the upper fork arm lifter 14, the maintenance personnel are lifted to the specified height to facilitate the maintenance personnel to perform maintenance at the specified position. The left electric push rod 19 drives the second arm 9 to rotate around the left clamping shaft 23 through the left linkage shaft 21. The inner frame 6 supports the second arm 9 movably. At the same time, the second arm 9 drives the cross frame 11 to slide upward through the left clamping shaft 23. The cross frame 11 drives the slider 31 to slide upward inside the chute 30. The second arm 9 drives the first arm 8 to rotate through the hinge shaft 10. The connecting block 12 supports the first arm 8 movably. The first arm 8 drives the carriage 7 to rotate around the right clamping shaft 20 through the right clamping shaft 20. The first arm 8 drives the carriage 7 to slide upward along the surface of the outer frame 5 through the right clamping shaft 20. Under the cooperation of the second arm 9 and the hinge shaft 10, the connecting block 12 drives the lower fork arm lifter 13, the upper fork arm lifter 14, the workbench 15 and the maintenance personnel to move towards the inner frame 6 to facilitate the lateral movement of the maintenance personnel to the next position for maintenance operations. The stepping motor 26 drives the worm 27 to rotate. The worm 27 drives the worm wheel 28 to rotate. At the same time, the worm wheel 28 drives the turning frame 4 to rotate through the rotating shaft 3. The turning frame 4 drives the outer frame 5, the inner frame 6, the second arm 9, the connecting block 12, the lower fork arm lifter 13, the upper fork arm lifter 14, the workbench 15 and the maintenance personnel to rotate synchronously to facilitate the circumferential rotation of the maintenance personnel to the specified building position. When the device needs to be stored, the maintenance personnel operate the remote controller 29 to reverse the lower electric push rod 18. The lower electric push rod 18 drives the brake block 17 to move upward until the brake block 17 is separated from the ground. At this time, the walking wheels 34 contact the ground. The maintenance personnel remove the locking bolt 32 from the inside of the electric vehicle 1. The locking bolt 32 changes from pressing the telescopic sleeve 16 and the electric vehicle 1 to loosening them. The maintenance personnel drive the telescopic sleeve 16 to rotate around the power shaft 33 to rotate the telescopic sleeve 16 to contact the side wall of the electric vehicle 1, reducing the floor area of the device after storage. The right electric push rod 22 drives the outer frame 5 and the inner frame 6 to rotate around the support shaft 25 through the right linkage shaft 24 to rotate the outer frame 5 and the inner frame 6 to the surface of the turning frame 4. The outer frame 5 and the inner frame 6 drive the lower fork arm lifter 13, the upper fork arm lifter 14 and the workbench 15 to rotate synchronously to facilitate the folding and contraction of the device, reducing the occupied space and completing the use of the lifting device.

[0039] The above are only the preferred embodiments of the present utility model, and do not impose any formal limitations on the present utility model. Although the present utility model has been disclosed above with the preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to equivalent embodiments with equivalent changes within the scope of the technical solution of the present utility model by using the disclosed technical content above. However, as long as it does not depart from the content of the technical solution of the present utility model, any brief modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims

1. A lifting device for building engineering maintenance, comprising an electric vehicle and a rotating box, characterized in that: A rotating box is installed at the central position of the top end of the electric vehicle. A rotating shaft is movably installed inside the rotating box, and the rotating shaft extends to the outside of the rotating box. The top end of the rotating shaft is installed with a flipping frame. The top end of the flipping frame is movably installed with an inner frame. An outer frame is installed inside the inner frame. Connecting blocks are arranged outside the inner frame. Slide frames are symmetrically and slidably sleeved on the outer wall of the outer frame. First arms are symmetrically arranged between the inner frame and the connecting blocks. Second arms are symmetrically arranged between the inner frame and the connecting blocks on one side of the first arms. Right clamping shafts are movably installed at one ends of the first arms close to the slide frames, and the first arms are all connected to the slide frames through the right clamping shafts. The bottom ends of the second arms are all movably connected to the inner frame. Hinge shafts are movably installed at the central positions of the outer walls of the first arms, and the first arms are all movably connected to the second arms through the hinge shafts. A cross frame is slidably installed on one side of the connecting block close to the inner frame. Left clamping shafts are movably installed at the top ends of the second arms on one side of the cross frame, and the second arms are all movably connected to the cross frame through the left clamping shafts. Four groups of walking wheels are installed at equal intervals at the bottom end of the electric vehicle.

2. The lifting device for building engineering maintenance according to claim 1, wherein: Chute grooves are symmetrically arranged on the side wall of the connecting block on one side of the cross frame. Sliding blocks are slidably installed inside the chute grooves, and the sliding blocks all extend to the outside of the chute grooves and are all connected to the cross frame. A lower fork arm hoist is installed on the outer wall of the connecting block far from the second arm. The top end of the lower fork arm hoist is installed with an upper fork arm hoist. The top end of the upper fork arm hoist is installed with a workbench.

3. A lifting device for building engineering maintenance according to claim 1, characterized in that: Four groups of telescopic sleeves are arranged at equal intervals on the outer wall of the electric vehicle below the rotating box. Power shafts are movably installed at one ends of the telescopic sleeves close to the electric vehicle, and the electric vehicle is all movably connected to the telescopic sleeves through the power shafts.

4. A lifting device for building engineering maintenance according to claim 3, characterized in that: Locking bolts are arranged at the top ends of the electric vehicle on one side of the power shafts, and the locking bolts extend to the surface of the telescopic sleeves. Lower electric push rods are installed at the ends of the telescopic sleeves far from the electric vehicle. Brake blocks are installed at the bottom ends of the lower electric push rods.

5. The lifting device for building engineering maintenance according to claim 1, characterized in that: Left electric push rods are symmetrically and movably installed on the side wall of the inner frame on one side of the second arms. Output ends of the left electric push rods are movably installed with left linkage shafts, and the output ends of the left electric push rods are all movably connected to the second arms through the left linkage shafts.

6. The lifting device for building engineering maintenance according to claim 1, wherein: A stepping motor is installed inside the rotating box above the electric vehicle. The output end of the stepping motor is installed with a worm.

7. An elevating device for building engineering maintenance according to claim 6, characterized in that: A worm gear is installed inside the rotating box on one side of the worm, and the worm gear meshes with the worm, and the top end of the worm gear is connected to the rotating shaft.

8. The lifting device for building engineering maintenance according to claim 1, wherein: Right electric push rods are symmetrically and movably installed at the top ends of the flipping frame. Output ends of the right electric push rods are movably installed with right linkage shafts, and the output ends of the right electric push rods are all movably connected to the outer frame through the right linkage shafts.

9. The lifting device for building engineering maintenance according to claim 1, characterized in that: Support shafts are symmetrically and movably installed at the bottom ends of the inner frame, and the flipping frame is all movably connected to the inner frame through the support shafts.

10. A lifting device for building engineering maintenance according to claim 1, characterized in that: A remote controller is installed on the side wall of the rotating box above the electric vehicle, and the output end of the remote controller is electrically connected to the input ends of the electric vehicle, the lower fork arm hoist, the upper fork arm hoist, the left electric push rod, the right electric push rod, the stepping motor, and the lower electric push rod.

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