Lifting appliance with compact structure

Abstract

The utility model discloses a lifting appliance with a compact structure, which comprises an opening and closing device, the opening and closing device comprises a rack, and a motor and a speed reducing mechanism are mounted on the rack; the speed reducing mechanism comprises a first-stage speed reducing mechanism and a second-stage speed reducing mechanism; the motor is horizontally arranged; in the vertical direction, the motor and the first-stage speed reducing mechanism are located at the same height, and the motor and an output shaft of the second-stage speed reducing mechanism are not equal in height. And the secondary speed reducing mechanism is used for driving the lifting transmission mechanism to open and close the clamp mechanism. According to the opening and closing device, the motor is arranged in the horizontal direction, the first-stage speed reducing mechanism and the motor are located at the same height in the vertical direction, the output shaft of the second-stage speed reducing mechanism and the motor are not equal in height in the vertical direction, and the size of the opening and closing device in the vertical direction and the size of the opening and closing device in the horizontal direction are reduced; due to the structural layout, the opening and closing device is more compact, and the size of the corresponding rack can be reduced, so that the size and the weight of the lifting appliance are reduced, the requirement on the bearing capacity of the lifting lug is reduced, the service life of the lifting lug is prolonged, and meanwhile, the cost of the lifting appliance is reduced.

Description

Technical Field

[0001] This utility model relates to the field of crane lifting equipment technology, and in particular to a compact lifting equipment. Background Technology

[0002] Lifting tools are widely used in machinery, metallurgy, petroleum, chemical, port, and shipbuilding industries. Especially in large steel enterprises, almost all product transfers are accomplished using lifting tools. Steel billet lifting typically employs billet clamps, which utilize leverage to lift the billet. For large billets, a power source is needed to drive an opening and closing device for unlocking. However, existing opening and closing devices are vertically long, resulting in a large overall size and weight, placing high demands on the load-bearing capacity of the lifting lugs, shortening their lifespan, and increasing the overall cost of the lifting tool. Utility Model Content

[0003] This utility model provides a compact lifting device to solve the above-mentioned technical problems.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] A compact lifting device includes an opening and closing mechanism, which includes a frame on which a motor and a reduction mechanism are mounted. The reduction mechanism includes a primary reduction mechanism and a secondary reduction mechanism. The motor is positioned horizontally. In the vertical direction, the motor and the primary reduction mechanism are at the same height but not at the same height as the output shaft of the secondary reduction mechanism. The secondary reduction mechanism is used to drive the lifting transmission mechanism to open and close the clamping mechanism.

[0006] Preferably, the reduction mechanism further includes a three-stage reduction mechanism, wherein the output shaft of the three-stage reduction mechanism and the output shaft of the two-stage reduction mechanism are at the same height in the vertical direction.

[0007] Preferably, in the horizontal direction: the output shaft of the secondary reduction mechanism is located on the side of the output shaft of the primary reduction mechanism facing the motor, and the output shaft of the tertiary reduction mechanism is located on the side of the output shaft of the secondary reduction mechanism away from the output shaft of the primary reduction mechanism.

[0008] Preferably, the first-stage reduction mechanism adopts a speed reducer mechanism, the second-stage reduction mechanism adopts a chain drive, and the third-stage reduction mechanism adopts a gear drive.

[0009] Preferably, the frame has an installation space, and the motor and reduction gear are installed in the installation space.

[0010] Preferably, the lifting transmission mechanism includes a rotating wheel and a sling. The rotating wheel is mounted on the output shaft of the three-stage reduction mechanism. One end of the sling is fixed to the rotating wheel and is wound / released as the rotating wheel rotates. The other end passes through the frame and is fixedly connected to the clamping mechanism.

[0011] Preferably, the opening and closing device is mounted on the frame, and a heat insulation cover is installed on the outside of the frame.

[0012] Preferably, a rotating mechanism is installed on the upper part of the frame, and a lifting lug is installed on the rotating mechanism. The rotating mechanism is used to drive the frame to rotate.

[0013] Preferably, a clamping mechanism is installed at the lower part of the frame.

[0014] Preferably, the clamping mechanism includes an inner clamp arm and an outer clamp arm arranged in a clamp shape. The middle parts of the inner and outer clamp arms are rotatably connected to the positioning seat, and their rotation axes do not coincide. The upper end of the inner clamp arm is rotatably connected to the lower end of the outer pull rod, and the upper end of the outer pull rod is rotatably connected to the lower part of the frame. The upper end of the outer clamp arm is rotatably connected to the lower end of the inner pull rod, and the upper end of the inner pull rod is rotatably connected to the lower part of the frame. The jaws of both the inner and outer clamp arms are provided with clamp teeth. The lifting transmission mechanism is connected to the positioning seat, and the two-stage reduction mechanism drives the lifting transmission mechanism to raise and lower the positioning seat to control the opening and closing of the inner and outer clamp arms.

[0015] Beneficial effects:

[0016] The compact lifting device disclosed in this application reduces the vertical and horizontal dimensions of the opening and closing device by setting the motor horizontally, making the first-stage reduction mechanism and the motor at the same height in the vertical direction, and the output shaft of the second-stage reduction mechanism at different heights in the vertical direction from the motor. This structural layout makes the opening and closing device more compact, and the corresponding frame size can be reduced, thereby reducing the volume and weight of the lifting device, lowering the load-bearing capacity requirements of the lifting lugs, which helps to extend the service life of the lifting lugs, and at the same time reducing the cost of the lifting device. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a structural schematic diagram of a compact lifting device disclosed in this utility model;

[0019] Figure 2 for Figure 1 Sectional view of AA;

[0020] Figure 3 This is a schematic diagram of the structure of a compact lifting device with the second vertical plate hidden.

[0021] Figure 4This is a front view of a compact lifting device disclosed in this utility model, without concealing the second vertical plate.

[0022] Figure 5 This is a top view of a compact lifting device disclosed in this utility model;

[0023] Figure 6 for Figure 5 Sectional view of BB;

[0024] Figure 7 for Figure 5 Sectional view of CC;

[0025] Figure 8 This is a schematic diagram of a compact lifting clamp mechanism disclosed in this utility model;

[0026] Figure 9 This is a front view of a compact lifting clamp mechanism disclosed in this utility model;

[0027] Figure 10 This is a top view of a compact lifting clamp mechanism disclosed in this utility model;

[0028] Figure 11 for Figure 10 A sectional view of DD.

[0029] 1. Opening and closing device; 11. Frame; 111. Base plate; 112. First upright plate; 113. Second upright plate; 114. Support base; 12. Motor; 131. First-stage reduction mechanism; 132. Second-stage reduction mechanism; 133. Third-stage reduction mechanism; 141. Rotating wheel; 142. Lifting sling;

[0030] 2. Clamping mechanism; 21. Inner clamp arm; 211. Inner bent arm plate; 212. First positioning block; 22. Outer clamp arm; 221. Outer bent arm plate; 222. Connecting block; 223. Second positioning block; 23. Positioning seat; 231. Support plate; 232. Positioning plate; 24. Outer pull rod; 25. Inner pull rod; 26. Clamping teeth; 27. Synchronizing rod;

[0031] 3. Frame; 31. Heat insulation cover; 4. Rotating mechanism; 5. Lifting lugs. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0033] A compact lifting device, combining Figures 1-7 As shown, the device includes an opening and closing device 1, which includes a frame 11 on which a motor 12 and a reduction mechanism are mounted. The reduction mechanism includes a primary reduction mechanism 131 and a secondary reduction mechanism 132. The motor 12 is positioned horizontally. In the vertical direction, the motor 12 and the primary reduction mechanism 131 are at the same height, but the output shaft of the secondary reduction mechanism 132 is not at the same height. The secondary reduction mechanism 132 is used to drive the lifting transmission mechanism to open and close the clamping mechanism 2. By positioning the motor 12 horizontally and ensuring that the primary reduction mechanism 131 and the motor 12 are at the same height in the vertical direction, while the output shaft of the secondary reduction mechanism 132 is not at the same height as the motor 12 in the vertical direction, the size of the opening and closing device in both the vertical and horizontal directions is reduced. This avoids the problem of the opening and closing device 1 being too large due to a series connection of stages in a single direction. The structural layout of this opening and closing device 1 makes the structure more compact, and the size of the corresponding frame 11 can be reduced, thereby reducing the volume and weight of the lifting device, reducing the load-bearing capacity requirements of the lifting lugs, which helps to extend the service life of the lifting lugs, and at the same time reducing the cost of the lifting device.

[0034] Preferably, the reduction mechanism further includes a three-stage reduction mechanism 133, wherein the output shaft of the three-stage reduction mechanism 133 is at the same height as the output shaft of the two-stage reduction mechanism 132 in the vertical direction. The three-stage reduction mechanism 133 can reduce the size and volume of each stage of the reduction mechanism while meeting the output torque requirements, thereby further reducing the structural weight.

[0035] Preferably, in the horizontal direction: the output shaft of the secondary reduction mechanism 132 is located on the side of the primary reduction mechanism 131's output shaft facing the motor 12, and the output shaft of the tertiary reduction mechanism 133 is located on the side of the secondary reduction mechanism 132's output shaft away from the primary reduction mechanism 131's output shaft. This arrangement ensures that the output shafts of the secondary reduction mechanism 132 and the tertiary reduction mechanism 133 are horizontally away from the primary reduction mechanism 131's output shaft, preventing interference between the transmission components on the output shafts of the secondary and tertiary reduction mechanisms 132 and the housing of the primary reduction mechanism 131.

[0036] Specifically, the length of the motor 12 is set in the horizontal direction and is located on the side of the first-stage reduction mechanism 131 facing the output shaft of the third-stage reduction mechanism 133, so that the dimensions of the second-stage reduction mechanism 132 and the third-stage reduction mechanism 133 in the horizontal direction coincide with the length direction of the motor 12, further shortening the dimensions in the horizontal direction and making the structure of the opening and closing device 1 more compact.

[0037] Specifically, the three-stage reduction mechanism 133 is located below the motor 12, allowing the lifting transmission mechanism to be directly connected to the clamping mechanism 2 below. The horizontal arrangement of the motor 12 and its horizontal overlap with the three-stage reduction mechanism 133 do not affect the operation of the lifting transmission mechanism. At the same time, it brings the center of gravity of the entire structure close to the output shaft of the three-stage reduction mechanism 133, preventing a large offset from affecting the center of gravity distribution of the entire lifting device, which is beneficial for maintaining stability during the lifting process.

[0038] Preferably, the first-stage reduction mechanism 131 adopts a speed reducer mechanism, the second-stage reduction mechanism 132 adopts a chain drive, and the third-stage reduction mechanism 133 adopts a gear drive. By fully utilizing the compact structure of the speed reducer mechanism and the gear drive, and supplementing it with the chain drive to facilitate adjustment of the center distance between the input and output shafts, the position of the output shaft of the second-stage reduction mechanism 132 can be easily adjusted so that it is horizontally offset from the speed reducer housing of the first-stage reduction mechanism 131, thereby making full use of the space below the motor 12.

[0039] Specifically, in this embodiment, the motor 12 and the first-stage reduction mechanism 131 are both geared motors, with the specific model being LKA77-40.62-DMP-112M.

[0040] Preferably, the frame 11 has an installation space, in which the motor 12 and the reduction mechanism are installed, and the frame 11 provides support and protection for the motor 12 and the reduction mechanism.

[0041] Specifically, the frame 11 includes a base plate 111, a first upright plate 112, a second upright plate 113, and a support base 114. The first upright plate 112 and the second upright plate 113 are arranged parallel to each other and spaced apart, and are both fixedly installed on the upper surface of the base plate 111. The support base 114 is installed between the first upright plate 112 and the second upright plate 113 and is located at the edge of the base plate 111. The base plate 111, the first upright plate 112, and the second upright plate 113 form an installation space. The motor 12 is installed on the inner wall of the first upright plate 112, and the first-stage reduction mechanism 131 is installed on the support base 114. That is, the reducer of the reduction motor is supported by the support base 114, and the motor is supported by the first upright plate 112. The output shafts of the first-stage reduction mechanism 131 are supported at both ends by bearings on the first vertical plate 112 and the second vertical plate 113, respectively. Similarly, the output shafts of the second-stage reduction mechanism 132 are supported at both ends by bearings on the support base 114 and the second vertical plate 113, and the output shafts of the third-stage reduction mechanism 133 are also supported at both ends by bearings on the first vertical plate 112 and the second vertical plate 113. This ensures that the output shafts of the first-stage, second-stage, and third-stage reduction mechanisms 131, are all supported at both ends, guaranteeing the rigidity and reliability of the structure under high output torque.

[0042] Specifically, the base plate 111, the first upright plate 112, and the second upright plate 113 are designed to reduce weight.

[0043] Preferably, the lifting transmission mechanism includes a rotating wheel 141 and a sling 142. The rotating wheel 141 is mounted on the output shaft of the three-stage reduction mechanism 133. One end of the sling 142 is fixed to the rotating wheel 141 and rotates with the rotating wheel 141 to retract / unwind, while the other end passes through the frame 11 and is fixedly connected to the clamping mechanism 2. When the output shaft of the three-stage reduction mechanism 133 drives the rotating wheel 141 to rotate clockwise, the sling 142 continuously winds around the rotating wheel 141 to retract, thus opening the clamping mechanism 2. When the output shaft of the three-stage reduction mechanism 133 drives the rotating wheel 141 to rotate counterclockwise, the sling 142 continuously unwinds from the rotating wheel 141 to lower, thus closing the clamping mechanism 2 under the action of gravity.

[0044] In this embodiment, the rotating wheel 141 is a sprocket, and the sling 142 is a chain. One end of the chain is fixed to the sprocket, and the sprocket rotates to wind or lower the chain.

[0045] Preferably, the opening and closing device 1 is mounted on the frame 3, and a heat insulation cover 31 is installed on the outside of the frame 3. The frame 3 supports the opening and closing device 1, and the heat insulation cover 31 provides heat insulation protection for the frame 3 and the opening and closing device 1. Because the opening and closing device 1 has a more compact structure and smaller size, the volume and weight of the frame 3 and the heat insulation cover 31 are also significantly reduced.

[0046] Preferably, a rotating mechanism 4 is installed on the upper part of the frame 3, and a lifting lug 5 is installed on the rotating mechanism 4. The rotating mechanism 4 is used to drive the frame 3 to rotate, so as to drive the frame 3 to adjust its posture angle.

[0047] Specifically, the rotating mechanism 4 includes a drive motor and a slewing bearing. The inner ring of the slewing bearing is connected to the lug 5, and the outer ring of the slewing bearing is connected to the top of the frame 3. The drive motor drives the gear to drive the teeth of the outer ring of the slewing bearing to rotate, thereby driving the frame 3 to rotate.

[0048] Preferably, a clamping mechanism 2 is installed at the lower part of the frame 3, and the clamping mechanism 2 is used to grip the steel billet.

[0049] Preferably, combined with Figure 1 , Figure 2 , Figure 8 , Figure 9 , Figure 10 and Figure 11 As shown, the clamping mechanism 2 includes an inner clamping arm 21 and an outer clamping arm 22 arranged in a clamping shape. The middle parts of the inner clamping arm 21 and the outer clamping arm 22 are rotatably connected to the positioning seat 23, and their rotation axes do not coincide. The upper end of the inner clamping arm 21 is rotatably connected to the lower end of the outer pull rod 24, and the upper end of the outer pull rod 24 is rotatably connected to the lower part of the frame 3. The upper end of the outer clamping arm 22 is rotatably connected to the lower end of the inner pull rod 25, and the upper end of the inner pull rod 25 is rotatably connected to the lower part of the frame 3. The jaws of the inner clamping arm 21 and the outer clamping arm 22 are both provided with clamping teeth 26. The lifting transmission mechanism is connected to the positioning seat 23, and the secondary reduction mechanism 132 drives the lifting transmission mechanism to drive the positioning seat 23 to rise and fall to control the opening and closing of the inner clamping arm 21 and the outer clamping arm 22.

[0050] Specifically, the outer clamp arm 22 includes two outwardly bent arm plates 221 that are arranged opposite to each other and spaced apart. A connecting block 222 is provided at the lower end of the two outwardly bent arm plates 221. The connecting block 222 is located between the two outwardly bent arm plates 221 and is fixedly connected to each other by welding. The lower ends of the two outwardly bent arm plates 221 and the connecting block 222 form the jaws of the outer clamp arm 22, and the clamp teeth 26 are installed on the connecting block 222.

[0051] The inner clamp arm 21 includes two inner bent arm plates 211 that are arranged opposite to each other and spaced apart. A connecting block 222 is provided at the lower end of the two inner bent arm plates 211. The connecting block 222 is located between the inner bent arm plates 211 and is fixedly connected to each other by welding. The lower ends of the two inner bent arm plates 211 and the connecting block 222 form the jaws of the inner clamp arm 21, and the clamp teeth 26 are installed on the connecting block 222.

[0052] The positioning base 23 includes two supporting uprights 231 located outside the two outwardly bent arm plates 221 and a positioning plate 232 connecting the two supporting uprights 231. The positioning plate 232 is welded and fixed to the bottom end of the two supporting uprights 231. The inner clamp arm 21 passes between the two outwardly bent arm plates 221 of the outer clamp arm 22. The two innerly bent arm plates 211 of the inner clamp arm 21 are respectively hinged to the two supporting uprights 231, and the two outwardly bent arm plates 221 of the outer clamp arm 22 are respectively hinged to the two supporting uprights 231. The portion of the outer bent arm plate 221 from the hinge axis of the outer bent arm plate 221 and the support upright plate 231 to the upper end of the outer bent arm plate 221 is located above the hinge axis of the inner clamp arm 21 and the support upright plate 231. The portion of the inner bent arm plate 211 from the hinge axis of the inner bent arm plate 211 and the support upright plate 231 to the upper end of the inner clamp arm 21 is located above the hinge axis of the outer clamp arm 22 and the support upright plate 231.

[0053] Two inner tie rods 25 are arranged opposite each other and spaced apart. The lower ends of the two inner tie rods 25 are respectively hinged to the upper ends of the two outer bent arm plates 221 and located between the two outer bent arm plates 221. Similarly, two outer tie rods 24 are arranged opposite each other and spaced apart. The lower ends of the two outer tie rods 24 are respectively hinged to the upper ends of the two inner bent arm plates 211 and located outside the two inner bent arm plates 211. The two outer tie rods 24 are located outside the two inner tie rods 25. The outer tie rods 24 and inner tie rods 25 on the same side are hinged to the lower part of the frame 3 through the same hinge axis. A distance is left between the hinge axes of the outer tie rods 24 and inner tie rods 25 on both sides for the sling 142 to pass through and connect to the positioning seat 23.

[0054] The lifting equipment moves the frame 3 vertically via the lifting lug 5, thereby changing the distance between the hinge axis of the outer tie rod 24 and the inner tie rod 25 and the positioning plate 232 of the frame 3. This causes the outer tie rod 24 and the inner tie rod 25 to rotate the inner clamp arm 21 and the outer clamp arm 22 relative to the positioning seat 23. The opening and closing device 1 lowers the sling 142 to unlock the clamping mechanism 2. The frame 3 moves down, causing the inner clamp arm 21 and the outer clamp arm 22 to open. The frame 3 moves up, causing the inner clamp arm 21 and the outer clamp arm 22 to close. The opening and closing device 1 then retracts the sling 142, locking the clamping mechanism 2.

[0055] Specifically, the positioning plate 232 is horizontally positioned and located above the clamping space formed by the inner clamp arm 21 and the outer clamp arm 22. When the clamping mechanism 2 is lowered, the inner clamp arm 21 and the outer clamp arm 22 open, and the positioning plate 232 abuts against the upper surface of the steel billet to achieve positioning. When the frame 3 moves upward, the inner pull rod 25 and the outer pull rod 24 rotate to make the inner clamp arm 21 and the outer clamp arm 22 close, thereby gripping the side of the steel billet with the clamp teeth 26 to achieve the gripping of the steel billet.

[0056] Specifically, a synchronizing rod 27 is provided between the inner clamp arm 21 and the outer clamp arm 22 to ensure that the inner clamp arm 21 and the outer clamp arm 22 rotate synchronously. The synchronizing rod 27 is located between the two inner bent arm plates 211 of the inner clamp arm 21. One end of the synchronizing rod 27 is hinged to the two inner bent arm plates 211, and the other end is hinged to the two outer bent arm plates 221 of the outer clamp arm 22. The hinge axes at both ends of the synchronizing rod 27, the hinge axis between the inner clamp arm 21 and the positioning seat 23, and the hinge axis between the outer clamp arm 22 and the positioning seat 23 form a parallelogram. The line connecting the hinge axis between the inner clamp arm 21 and the positioning seat 23 and the hinge axis between the outer clamp arm 22 and the positioning seat 23, and the synchronizing rod 27 serve as the hinge axis of the parallelogram.

[0057] Specifically, two inner bent arm plates 211 are fixedly welded with a first positioning block 212, and two outer bent arm plates 221 are fixedly welded with a second positioning block 223. The first positioning block 212 and the second positioning block 223 on the same side of the inner bent arm plate 211 and the outer bent arm plate 221 cooperate. When the clamping mechanism 2 is opened, the inner bent arm plate 211 and the outer bent arm plate 221 on the same side rotate relative to the positioning seat 23, and the corresponding first positioning block 212 and the second positioning block 223 move closer to each other. When the first positioning block 212 and the second positioning block 223 abut against each other, the rotation angle of the inner bent arm plate 211 and the outer bent arm plate 221 can be limited, thereby limiting the maximum opening angle of the inner clamp arm 21 and the outer clamp arm 22.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A compact lifting device, comprising an opening and closing device (1), characterized in that, The opening and closing device (1) includes a frame (11), on which a motor (12) and a reduction mechanism are mounted; the reduction mechanism includes a primary reduction mechanism (131) and a secondary reduction mechanism (132); the motor (12) is arranged horizontally; in the vertical direction, the motor (12) is at the same height as the primary reduction mechanism (131) and is not at the same height as the output shaft of the secondary reduction mechanism (132); the secondary reduction mechanism (132) is used to drive the lifting transmission mechanism to open and close the clamping mechanism (2).

2. The compact lifting device according to claim 1, characterized in that, The deceleration mechanism also includes a three-stage deceleration mechanism (133), and in the vertical direction, the output shaft of the three-stage deceleration mechanism (133) is at the same height as the output shaft of the two-stage deceleration mechanism (132).

3. The compact lifting device according to claim 2, characterized in that, In the horizontal direction: the output shaft of the secondary reduction mechanism (132) is located on the side of the output shaft of the primary reduction mechanism (131) facing the motor (12), and the output shaft of the tertiary reduction mechanism (133) is located on the side of the output shaft of the secondary reduction mechanism (132) away from the output shaft of the primary reduction mechanism (131).

4. The compact lifting device according to claim 2, characterized in that, The first-stage reduction mechanism (131) adopts a speed reducer mechanism, the second-stage reduction mechanism (132) adopts a chain drive, and the third-stage reduction mechanism (133) adopts a gear drive.

5. A compact lifting device according to claim 1, characterized in that, The frame (11) is provided with an installation space, and the motor (12) and the reduction mechanism are installed in the installation space.

6. A compact lifting device according to claim 2, characterized in that, The lifting transmission mechanism includes a rotating wheel (141) and a sling (142). The rotating wheel (141) is mounted on the output shaft of the three-stage reduction mechanism (133). One end of the sling (142) is fixed to the rotating wheel (141) and is wound / released as the rotating wheel (141) rotates. The other end passes through the frame (11) and is fixedly connected to the clamping mechanism (2).

7. A compact lifting device according to claim 1, characterized in that, The opening and closing device (1) is installed on the frame (3), and a heat insulation cover (31) is installed on the outside of the frame (3).

8. A compact lifting device according to claim 7, characterized in that, A rotating mechanism (4) is installed on the upper part of the frame (3), and a lifting lug (5) is installed on the rotating mechanism (4). The rotating mechanism (4) is used to drive the frame (3) to rotate.

9. A compact lifting device according to claim 7, characterized in that, The lower part of the frame (3) is equipped with a clamping mechanism (2).

10. A compact lifting device according to claim 9, characterized in that, The clamping mechanism (2) includes an inner clamp arm (21) and an outer clamp arm (22) arranged in a clamp shape. The middle parts of the inner clamp arm (21) and the outer clamp arm (22) are rotatably connected to the positioning seat (23) and their rotation axes do not coincide. The upper end of the inner clamp arm (21) is rotatably connected to the lower end of the outer pull rod (24), and the upper end of the outer pull rod (24) is rotatably connected to the lower part of the frame (3). The upper end of the outer clamp arm (22) is rotatably connected to the lower end of the inner pull rod (25), and the upper end of the inner pull rod (25) is rotatably connected to the lower part of the frame (3). The jaws of the inner clamp arm (21) and the outer clamp arm (22) are provided with clamp teeth (26). The lifting transmission mechanism is connected to the positioning seat (23), and the secondary reduction mechanism (132) drives the lifting transmission mechanism to drive the positioning seat (23) to rise and fall to control the opening and closing of the inner clamp arm (21) and the outer clamp arm (22).

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