Lifting spreader with self-balancing function

Abstract

The present application relates to the technical field of lifting appliance, and specifically discloses a lifting appliance with self-balancing function, which comprises a supporting device, a moving device, a clamping device, a fixing device, a rotary support bearing and a speed reducer; the moving device is arranged in the inner cavity of the supporting device and can move forward and backward in the supporting device; the clamping device is four in number and is arranged on the left and right sides of the moving device respectively, and the moving device can drive the four clamping devices to clamp the container; the fixing device is four in number and is arranged on the bottom surface of the four clamping devices respectively. The moving device drives the gear to rotate through the brake motor, drives the rack and the connecting rod to link together, makes the four sliding blocks move forward and backward in the sliding groove, accurately adjusts the lateral spacing of the clamping device, quickly matches the fork groove position of the container of different sizes, can adapt to containers of various specifications without replacing the lifting appliance, greatly reduces the time consumption of equipment replacement, improves the loading and unloading efficiency, and reduces the operation cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lifting devices, in particular to a lifting device with self-balancing function. BACKGROUND

[0002] In the field of container loading and unloading and transportation, the lifting device, as the core component connecting the hoisting equipment and the container, its performance is directly related to the safety and efficiency of the operation. The existing lifting device generally adopts a plug rod type fixing structure, and only through the insertion of the plug rod into the fork groove at the bottom of the container to achieve the preliminary connection. However, during the transportation process, especially in the face of bumpy road or inclined working conditions, the container is easy to slide or even fall off due to inertial force or vibration, which poses a serious safety hazard. Although some improved schemes try to add fixing structures, there are generally problems such as complex operation, lagging response or insufficient adaptability, which are difficult to meet the diversified operation requirements.

[0003] In addition, the traditional lifting device is usually designed for a specific size of container (such as 20 feet or 40 feet standard box), and due to the difference in the position and size of the fork groove of different containers, the lifting device needs to be frequently replaced during operation, resulting in low loading and unloading efficiency, increased complexity of equipment operation, and high additional cost. Therefore, developing a lifting device with high safety and strong versatility has become a technical problem to be solved in the field. SUMMARY

[0004] The present application aims to provide a lifting device with self-balancing function to solve the problems raised in the background.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a lifting device with self-balancing function, comprising a support device, a moving device, a clamping device, a fixing device, a rotary support bearing and a speed reducer, the support device is used for connecting with the lifting hook of the lifting truck; the moving device is arranged in the inner cavity of the support device, and the moving device can move forward and backward in the support device; the clamping device is four in number, and is arranged on the left and right sides of the moving device respectively, and the moving device can drive the four clamping devices to clamp the container; the fixing device is four in number, and is arranged on the bottom surface of the four clamping devices respectively, and the four clamping devices can drive the four fixing devices to insert into the fork groove at the bottom of the container, so that the fixing device is fixed in the fork groove at the bottom of the container; the rotary support bearing is arranged at the center of the support device; the speed reducer is arranged on the bottom surface near the center of the top of the support device, the gear of the output end of the speed reducer is engaged with the rotary support bearing, and the speed reducer can drive the rotary support bearing to rotate, so that the bottom of the support device connected with the outer ring of the rotary support bearing can rotate.

[0006] Preferably, in order to be connected with the loading and unloading crane hook, the supporting device comprises a lifting lug, a connecting plate, a fixed cylindrical block, a fixed circular plate, a supporting plate, a first cavity and a sliding groove. The number of the lifting lug is two, which is used to be connected with the hook of the lifting loading and unloading crane. The connecting plate is arranged on the bottom surface of the two lifting lugs. The bottom surface of the connecting plate near the center is fixedly provided with a speed reducer. The fixed cylindrical block is arranged on the bottom surface of the center of the connecting plate. The fixed circular plate is arranged on the bottom surface of the fixed cylindrical block. The inner ring of the slewing support bearing is fixedly connected with the fixed circular plate through a screw rod. The supporting plate is arranged on the bottom surface of the outer ring of the slewing support bearing. The outer ring of the slewing support bearing is fixedly connected with the top surface of the supporting plate through a screw rod. The first cavity is arranged in the supporting plate. The left and right sides of the outer wall of the supporting plate are provided with sliding grooves. The two sliding grooves are connected with the first cavity.

[0007] Preferably, in order to drive the clamping device to be vertically aligned with the bottom fork groove of the loading and unloading crane, the moving device comprises a sliding block, a connecting rod, a first groove, a rack, a gear and a brake motor. The number of the sliding block is four, which is arranged in the two sliding grooves respectively. The four sliding blocks can move forward and backward in the two sliding grooves. Every two left and right aligned sliding blocks form a group. The number of the connecting rod is two, which is arranged between the two groups of sliding blocks respectively. The bottom of the two connecting rods is provided with a front and back through first groove. The two first grooves are staggered. The number of the rack is two, which is arranged on one side of the outer wall of the two connecting rods respectively. The two racks are arranged in the two first grooves respectively. The two racks can move forward and backward in the two first grooves respectively. The gear is arranged between the two racks. The gear is meshed with the two racks. The gear is arranged in the bottom center of the first cavity through a rotating shaft. The brake motor is arranged in the top center of the first cavity. The output end of the brake motor is fixedly connected with the gear.

[0008] Preferably, the brake motor drives the gear to rotate. The gear drives the two connecting rods to move and stretch through the rack. The four sliding blocks move and stretch forward and backward in the two sliding grooves respectively.

[0009] Preferably, in order to insert the fixed device into the fork groove, the clamping device comprises a limiting rod, a second groove, a first moving groove, an electric push rod, a first moving block and a second moving block. The limiting rod is arranged on one side of the outer wall of the sliding block. The bottom surface of the outer wall of the limiting rod is provided with a second groove. The front and back sides of the second groove are provided with a first moving groove respectively. The electric push rod is arranged in the right end of the second groove. The first moving block is arranged at the output end of the electric push rod. The number of the second moving block is two, which is arranged on the front and back sides of the first moving block respectively. The two second moving blocks can move left and right in the two first moving grooves respectively. The heavy load electric push rod is arranged on the bottom surface of the outer wall of the first moving block.

[0010] Preferably, the electric push rod drives the first moving block to move along the first moving groove, the bottom surface of the first moving block is fixed with a heavy-load electric push rod, and the heavy-load electric push rod is used for vertically inserting the fixing device into the container fork groove.

[0011] Preferably, in order to be fixed with the inner wall of the fork groove, the fixing device comprises a plug rod, a rectangular block, a second cavity, a second moving groove, a third groove, a flat DC brushless motor, a rotating plate, an arc-shaped groove, a moving rod, a sliding rod and a fixing block, the plug rod is arranged at the output end of the heavy-load electric push rod; the rectangular block is arranged at the left end of the plug rod, a second cavity penetrating up and down is arranged at the center of the top surface of the rectangular block, second moving grooves are arranged at the front and back of the rectangular block, third grooves are arranged at the front and back of the top surface of the rectangular block, the output end of the flat DC brushless motor is arranged in the second cavity, the rotating plate is arranged at the output end of the flat DC brushless motor and can rotate in the second cavity, arc-shaped grooves are arranged on the surface of the rotating plate, the moving rods are arranged in the second moving grooves and can move forward and backward along the second moving grooves, the sliding rods are arranged at the top surface of the extension end of the second moving groove, the top end of the sliding rod is arranged in one end of the arc-shaped groove, and the fixing block is arranged at the other end of the moving rod.

[0012] Preferably, the flat DC brushless motor drives the rotating plate to rotate through the two arc-shaped grooves to drive the two sliding rods to move and expand the two moving rods, so that the two fixing blocks expand and fix the inner wall of the container bottom fork groove.

[0013] Compared with the prior art, the beneficial effects of the present application are:

[0014] 1. Adapt to multiple sizes of containers: the moving device drives the gear to rotate through the brake motor, drives the rack and the connecting rod to link, moves the four sliding blocks forward and backward in the sliding groove, accurately adjusts the transverse spacing of the clamping device, quickly matches the fork groove position of different size containers, does not need to replace the lifting appliance, can adapt to multiple specifications of containers, greatly reduces the time consumption of equipment replacement, improves the loading and unloading efficiency, and reduces the operation cost.

[0015] 2. Double fixation: the fixing device adopts a "plug rod insertion and expansion fixation" double locking mechanism; first, the plug rod is inserted into the container fork groove through a heavy-duty electric push rod to achieve primary fixation; then, the flat DC brushless motor drives the rotating plate to rotate, through the arc-shaped groove to drive the sliding rod and the moving rod linkage, so that the fixing block expands towards the inner wall of the fork groove, forming secondary mechanical locking; each fork groove is bidirectionally clamped by two fixing blocks, and four fork grooves are synchronously fixed, effectively resisting the vibration and inertial force in the transportation process, eliminating the risk of container sliding or falling, and significantly improving the operation safety.

[0016] 3. Rotational balance: the slewing bearing cooperates with the reducer to drive the support device to rotate stably through gear meshing, so that the container can be flexibly adjusted in posture during lifting, while ensuring stable center of gravity; this design not only improves the accuracy of loading and unloading operation, but also effectively reduces the risk of rollover caused by rotational imbalance, especially suitable for container transfer under complex working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic diagram of the present application;

[0018] Figure 2 is a structural schematic diagram of the support device of the present application;

[0019] Figure 3 is a structural schematic diagram of the slewing bearing of the present application;

[0020] Figure 4 is an exploded structural schematic diagram of the slewing bearing of the present application;

[0021] Figure 5 is a structural schematic diagram of the moving device of the present application;

[0022] Figure 6 is a gear position structural schematic diagram of the moving device of the present application;

[0023] Figure 7 is an exploded structural schematic diagram of two racks of the moving device of the present application;

[0024] Figure 8 is an exploded structural schematic diagram of the gear assembly of the moving device of the present application;

[0025] Figure 9 is a brake motor position structural schematic diagram of the moving device of the present application;

[0026] Figure 10 is a structural schematic diagram of the four clamping devices of the present application;

[0027] Figure 11 is a limit rod cross-sectional structural schematic diagram of the clamping device of the present application;

[0028] Figure 12 Structure diagram of four fixing devices of the present application;

[0029] Figure 13 Structure diagram of position of the fixing device of the present application;

[0030] Figure 14 Structure diagram of rectangular block section of the fixing device of the present application;

[0031] Figure 15 Structure diagram of third groove of the fixing device of the present application;

[0032] Figure 16 Structure diagram of section of the fixing device of the present application;

[0033] Figure 17 Structure diagram of fixing block of the fixing device of the present application;

[0034] Figure 18 Structure diagram of the fixing device of the present application.

[0035] In the figure: 1, support device; 2, moving device; 3, clamping device; 4, fixing device; 5, rotary support bearing; 6, speed reducer; 11, lifting lug; 12, connecting plate; 13, fixed cylindrical block; 14, fixed circular plate; 15, support plate; 16, first cavity; 17, chute; 21, sliding block; 22, connecting rod; 23, first groove; 24, rack; 25, gear; 26, brake motor; 31, limiting rod; 32, second groove; 33, first moving slot; 34, electric push rod; 35, first moving block; 36, second moving block; 37, heavy load electric push rod; 41, insertion rod; 42, rectangular block; 43, second cavity; 44, second moving slot; 45, third groove; 46, flat type DC brushless motor; 47, rotating plate; 48, arc-shaped slot; 49, moving rod; 410, sliding rod; 411, fixed block. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0037] Please refer to Figures 1-18The application provides a lifting sling with a self-balancing function, which is characterized by comprising a supporting device 1, a moving device 2, a clamping device 3, a fixing device 4, a rotary support bearing 5 and a speed reducer 6. The supporting device 1 is used for being connected with a lifting hook of a lifting truck. The moving device 2 is arranged in the inner cavity of the supporting device 1, and the moving device 2 can move forward and backward in the supporting device 1. The clamping device 3 is four in number and is arranged on the left and right sides of the moving device 2, and the moving device 2 can drive the four clamping devices 3 to clamp a container. The fixing device 4 is four in number and is arranged on the bottom surface of the four clamping devices 3, and the four clamping devices 3 can drive the four fixing devices 4 to be inserted into the fork groove at the bottom of the container, so that the fixing device 4 is fixed in the fork groove at the bottom of the container. The rotary support bearing 5 is arranged at the center of the supporting device 1, the rotary support bearing 5 has a certain bearing capacity and can bear the gravity of containers of any size and has a certain stability. The speed reducer 6 is arranged on the bottom surface of the supporting device 1 near the center at the top, the gear on the output end of the speed reducer 6 is engaged with the rotary support bearing 5, and the speed reducer 6 can drive the rotary support bearing 5 to rotate, so that the bottom of the supporting device 1 connected with the outer ring of the rotary support bearing 5 can rotate. The cooperation of the moving device 2, the clamping device 3 and the fixing device 4 can be suitable for the fork groove of containers of any size, and the application range is wide. The cooperation of the rotary support bearing 5 and the speed reducer 6 can ensure the stability and safety of the container during rotation, and the rotary support bearing 5 and the speed reducer 6 can ensure the stability of the gravity center when the container rotates.

[0038] As a preferred solution, further, as shown in Figure 2 、 Figure 3 and Figure 4 , the supporting device 1 comprises a lifting lug 11, a connecting plate 12, a fixed cylindrical block 13, a fixed circular plate 14, a supporting plate 15, a first cavity 16 and a sliding groove 17. The lifting lug 11 is two in number and is used for being connected with the lifting hook of the lifting truck. The inner side of the lifting lug 11 is provided with a wear-resistant bushing, and the lifting lug 11 is connected with the lifting hook of the lifting truck by using a quick-release pin shaft, so that the lifting lug 11 can be quickly assembled and disassembled. The connecting plate 12 is arranged on the bottom surface of the two lifting lugs 11. The bottom surface of the connecting plate 12 near the center is fixedly provided with the speed reducer 6. A rubber shock pad is arranged between the connecting plate 12 and the speed reducer 6, so as to reduce the influence of transmission vibration on the upper structure. The fixed cylindrical block 13 is arranged on the bottom surface of the connecting plate 12. The inner ring of the rotary support bearing 5 is fixedly connected with the fixed circular plate 14 through a screw rod. The supporting plate 15 is arranged on the bottom surface of the outer ring of the rotary support bearing 5, and the outer ring of the rotary support bearing 5 is fixedly connected with the top surface of the supporting plate 15 through a screw rod. The first cavity 16 is arranged in the supporting plate 15. The sliding grooves 17 are arranged on the left and right sides of the outer wall of the supporting plate 15, and the two sliding grooves 17 penetrate into the first cavity 16.

[0039] As a preferred solution, further, as shown inFigure 5 、 Figure 6 、 Figure 7 、 Figure 8 and Figure 9 As shown in FIGS. 1-9, the mobile device 2 comprises sliders 21, connecting rods 22, first grooves 23, racks 24, gears 25 and brake motors 26. The sliders 21 are four in number and are arranged in two slide grooves 17 respectively. The sliders 21 can move forward and backward in the slide grooves 17. The four sliders 21 are aligned left and right in two groups. The sliders 21 are made of wear-resistant material, which reduces the frequency of equipment maintenance and prolongs the service life of the equipment. The connecting rods 22 are two in number and are arranged between the two groups of sliders 21. The bottom of each connecting rod 22 is provided with a first groove 23 extending forward and backward. The two first grooves 23 are staggered. The arrangement of the two first grooves 23 allows the two racks 24 to move without affecting the two connecting rods 22. The racks 24 are two in number and are arranged on one side of the outer wall of the two connecting rods 22. The two racks 24 are arranged in the two first grooves 23 respectively. The two racks 24 can move forward and backward in the two first grooves 23 respectively. The gear 25 is arranged between the two racks 24. The gear 25 is engaged with the two racks 24. The gear 25 is arranged at the bottom center of the first cavity 16 through a rotating shaft. The brake motor 26 is arranged at the top center of the first cavity 16. The output end of the brake motor 26 is fixedly connected with the gear 25. The brake motor 26 can rotate bidirectionally to drive the gear 25 to rotate bidirectionally. The brake motor 26 drives the gear 25 to rotate, which drives the two connecting rods 22 to move and expand through the rack 24. Thus, the four sliders 21 move and expand forward and backward in the two slide grooves 17 respectively. The cooperation of the gear 25 and the two racks 24 allows the two connecting rods 22 to expand, so that the four clamping devices 3 are vertically aligned in the four fork grooves.

[0040] As a preferred solution, further, as Figure 10 and Figure 11As shown, the clamping device 3 comprises a limiting rod 31, a second groove 32, a first moving groove 33, an electric push rod 34, a first moving block 35 and a second moving block 36. The limiting rod 31 is arranged on one side of the outer wall of the sliding block 21. The outer wall bottom surface of the limiting rod 31 is provided with the second groove 32. The front and back sides of the second groove 32 are both provided with the first moving groove 33. The electric push rod 34 is arranged at the right end in the second groove 32. The electric push rod 34 is selected to be a multi-section electric push rod, so that the structure is more compact. The first moving block 35 is arranged at the output end of the electric push rod 34. The second moving block 36 is two in number and is arranged on the front and back sides of the first moving block 35 respectively. The two second moving blocks 36 can move left and right in the two first moving grooves 33 respectively. The two second moving blocks 36 are made of wear-resistant material, so as to prolong the service life of the equipment. The heavy-load electric push rod 37 is arranged on the outer wall bottom surface of the first moving block 35. The first moving block 35 can bear the gravity on the bottom through the two second moving blocks 36, so as to have a certain bearing capacity.

[0041] As a preferred solution, further, as Figure 12 、 Figure 13 、 Figure 14 、 Figure 15 、 Figure 16 、 Figure 17 and Figure 18As shown, the fixing device 4 comprises a plug rod 41, a rectangular block 42, a second cavity 43, a second moving groove 44, a third groove 45, a flat DC brushless motor 46, a rotating plate 47, an arc-shaped groove 48, a moving rod 49, a sliding rod 410 and a fixing block 411, the plug rod 41 is arranged at the output end of the heavy-duty electric push rod 37; the rectangular block 42 is arranged at the left end of the plug rod 41, the second cavity 43 is arranged in the center of the rectangular block 42, the second moving groove 44 is arranged on the front and back sides of the rectangular block 42, the third groove 45 is arranged at the top of the rectangular block 42, the flat DC brushless motor 46 is arranged at the bottom of the rectangular block 42, the output end of the flat DC brushless motor 46 is inserted into the second cavity 43, the flat DC brushless motor 46 is flat, which can make the fixing device 4 inserted into the fork groove without being affected by the length of the flat DC brushless motor 46, the rotating plate 47 is arranged at the output end of the flat DC brushless motor 46, and the rotating plate 47 is arranged in the top of the second cavity 43 and can rotate, the arc-shaped groove 48 is arranged on the surface of the rotating plate 47; the moving rod 49 is arranged in the second moving groove 44, and the moving rod 49 can move forward and backward along the second moving groove 44, one end of the second moving groove 44 extends into the second cavity 43, and the second moving groove 44 has the functions of limiting and supporting the moving rod 49; the sliding rod 410 is arranged on the top of the second moving groove 44, and the top end of the sliding rod 410 is arranged in one end of the arc-shaped groove 48, and the sliding rod 410 can move in the arc-shaped groove 48; the fixing block 411 is arranged at the other end of the moving rod 49, the rotating plate 47 driven by the flat DC brushless motor 46 rotates through the two arc-shaped grooves 48 to drive the two sliding rods 410 to make the two moving rods 49 move and expand, so that the two fixing blocks 411 expand and fix the inner wall of the container bottom fork groove; the device can make the loading and unloading more stable during the rotation of the container, and has safety, four plug rods 41 are inserted into four fork grooves, which belongs to primary fixation, because the container needs to be rotated and maintained in the center during transportation, and in order to improve safety, the inner wall of one fork groove is fixed by the expansion of the two fixing blocks 411, and the inner wall of the four fork grooves is fixed by the two fixing blocks 411, which greatly improves the safety of the device for container transportation.

[0042] The detailed connection means is a known technology in the art, and the working principle and process are mainly introduced as follows.

[0043] The lifting lug 11 of the support device 1 is connected with the loading and unloading hook through a quick release pin shaft, the connecting plate 12 is fixed with the speed reducer 6 through a rubber damping pad to form a load bearing foundation, the inner ring of the rotary support bearing 5 is connected with the fixed circular plate 14 through a screw rod, and the outer ring is fixed with the support plate 15, so that the bottom device can rotate around the center;

[0044] When the lifting appliance moves above the container, the brake motor 26 drives the gear 25 to rotate, the connecting rod 22 is driven to move forward and backward through the meshing rack 24, and then the sliding block 21 is driven to slide in the sliding groove 17, four groups of sliding blocks 21 are divided into left and right groups, and two sliding blocks 21 in each group move synchronously, so that the clamping device 3 installed on the outer side of the sliding block 21 can be adjusted in transverse spacing, and the four fork grooves at the bottom of the container can be accurately aligned;

[0045] When the limiting rod 31 moves to the top of the fork groove along with the sliding block 21, the electric push rod 34 drives the first moving block 35 to move downward along the second groove 32, the second moving blocks 36 on the two sides slide in the first moving groove 33, and the heavy load electric push rod 37 is ensured to move vertically downward;

[0046] The heavy load electric push rod 37 pushes the insertion rod 41 to insert into the fork groove at the bottom of the container, so that the initial mechanical connection is realized, at this time, the insertion rod 41 only bears the vertical load and is not fixed with the inner wall of the fork groove, and further secondary locking is needed to enhance the stability;

[0047] After the insertion rod 41 is inserted into the fork groove, the flat type brushless DC motor 46 drives the rotating plate 47 to rotate, the arc-shaped groove 48 on the surface of the rotating plate 47 drives the sliding rod 410 to move along the groove rail, the sliding rod is fixedly connected with the moving rod 49, when the rotating plate 47 rotates, the sliding rod 410 moves in a curve in the arc-shaped groove 48, and the moving rod 49 is pushed to expand to the two sides along the second moving groove 44;

[0048] The fixed block 411 at the end of the moving rod 49 expands along with the moving rod 49, is tightly attached to the inner wall of the fork groove, and forms mechanical locking in the horizontal direction, two fixed blocks 411 are bidirectionally abutted to each fork groove, and four fork grooves are synchronously fixed, so that the connection strength of the lifting appliance and the container is significantly improved, and the vibration and inertial force in transportation are resisted;

[0049] The gear 25 at the output end of the speed reducer 6 is engaged with the outer ring of the rotary support bearing 5, when it is needed to adjust the posture of the container, the speed reducer 6 drives the rotary support bearing 5 to rotate, drives the support plate 15 and the bottom device to rotate, since the inner ring of the rotary support bearing 5 is fixed at the center of the support device 1, the outer ring of the rotary support bearing 5 rotates synchronously with the container, the stability of the center of gravity in the rotating process is ensured, the risk of rollover caused by centrifugal force is avoided, in the process of loading and unloading, the container angle can be adjusted through the support device 1 to adapt to different loading and unloading position requirements, when bumps or inclined conditions are encountered in the transportation process, the rotating balance mechanism can dynamically adjust the posture of the container, and the safety is further improved.

[0050] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. A lifting device with self-balancing function, characterized in that, include: Support device (1) for connecting to the hook of a crane loading and unloading vehicle; The moving device (2) is disposed in the inner cavity of the support device (1), and the moving device (2) is capable of moving back and forth within the support device (1); There are four clamping devices (3), which are respectively set on the left and right sides of the moving device (2), and the moving device (2) can drive the four clamping devices (3) to move. The number of fixing devices (4) is four, which are respectively set on the bottom surface of the four clamping devices (3), and the four clamping devices (3) can drive the four fixing devices (4) to be inserted into the fork slots at the bottom of the container, so that the fixing devices (4) are fixed in the fork slots at the bottom of the container. A slewing support bearing (5) is disposed at the center of the support device (1); The reducer (6) is located on the bottom surface of the support device (1) near the center. The gear at the output end of the reducer (6) meshes with the slewing support bearing (5). The reducer (6) can drive the slewing support bearing (5) to rotate, so that the bottom of the support device (1) connected to the outer ring of the slewing support bearing (5) can rotate. The support device (1) includes: A support plate (15) is provided on the bottom surface of the outer ring of the slewing support bearing (5), and the outer ring of the slewing support bearing (5) is fixedly connected to the top surface of the support plate (15) by a screw. A first cavity (16) is provided in the support plate (15). Slide grooves (17) are provided on both the left and right sides of the outer wall of the support plate (15), and both slide grooves (17) extend into the first cavity (16). The mobile device (2) includes: There are four sliders (21), which are respectively set in the two slide grooves (17) and can move back and forth within the two slide grooves (17). The four sliders (21) are arranged in pairs, left and right, to form a group. There are two connecting rods (22), which are respectively set between the two sets of sliders (21). The bottom of each of the two connecting rods (22) is provided with a first groove (23) that runs through the front and back, and the two first grooves (23) are staggered. Two racks (24) are respectively disposed on one side of the outer wall of the two connecting rods (22). The two racks (24) are respectively disposed in the two first grooves (23), and the two racks (24) can move back and forth in the two first grooves (23); A gear (25) is disposed between the two racks (24), and the gear (25) meshes with the two racks (24). The gear (25) is disposed at the bottom center of the first cavity (16) via a rotating shaft. A brake motor (26) is located at the top center of the first cavity (16), and the output end of the brake motor (26) is rotatably connected to the gear (25); The clamping device (3) includes: A limiting rod (31) is provided on one side of the outer wall of the slider (21). A second groove (32) is provided on the bottom surface of the outer wall of the limiting rod (31). A first moving groove (33) is provided on both the front and rear sides of the second groove (32). An electric push rod (34) is disposed at the right end within the second groove (32); The first moving block (35) is disposed at the output end of the electric push rod (34); There are two second moving blocks (36), which are respectively set on the front and rear sides of the first moving block (35), and the two second moving blocks (36) can move left and right within the two first moving slots (33); A heavy-duty electric push rod (37) is disposed on the bottom surface of the outer wall of the first moving block (35); The fixing device (4) includes: Insert rod (41) is provided at the output end of the heavy-duty electric push rod (37); A rectangular block (42) is disposed at the left end of the insertion rod (41). A second cavity (43) is formed in the center of the rectangular block (42) and extends vertically. A second moving groove (44) is formed on both the front and rear sides of the rectangular block (42). A third groove (45) is formed at both the front and rear ends of the top face of the rectangular block (42), and the two third grooves (45) extend into the two second moving grooves (44) respectively. A flat brushless DC motor (46) is disposed on the bottom surface of the rectangular block (42), and the output end of the flat brushless DC motor (46) extends into the second cavity (43). A rotating plate (47) is disposed at the output end of the flat DC brushless motor (46), and the rotating plate (47) is disposed in the top of the second cavity (43) and can rotate. Two arc-shaped grooves (48) are opened on the surface of the rotating plate (47). There are two movable rods (49), which are respectively embedded in the two second movable slots (44), and the two movable rods (49) can move back and forth along the two second movable slots (44) respectively. One end of each of the two second movable slots (44) extends into the second cavity (43). There are two slide rods (410), which are respectively set on the top surface of the moving rod (49), and the top ends of the two slide rods (410) are respectively set in one end of the arc groove (48), and the two slide rods (410) can be limited to move within the two arc grooves (48); There are two fixed blocks (411), which are respectively set at one end of the two moving rods (49).

2. A lifting device with self-balancing function according to claim 1, characterized in that, The support device (1) also includes: Lifting lugs (11), two in number, are used to connect with the hook of the crane loading and unloading vehicle; A connecting plate (12) is provided on the bottom surface of the two lifting lugs (11), and a reducer (6) is fixedly provided on the bottom surface of the connecting plate (12) near the center. A fixed cylindrical block (13) is disposed at the center of the bottom surface of the connecting plate (12); A fixed circular plate (14) is set on the bottom surface of the fixed cylindrical block (13), and the inner ring of the rotary support bearing (5) is fixedly connected to the fixed circular plate (14) by a screw.

3. A lifting device with self-balancing function according to claim 2, characterized in that, The brake motor (26) drives the gear (25) to rotate, so that the gear (25) drives the two connecting rods (22) to move and extend through the rack (24), so that the slider (21) moves and extends in the two slide grooves (17) respectively.

4. A lifting device with self-balancing function according to claim 3, characterized in that, The electric push rod (34) drives the first moving block (35) to move along the first moving groove (33). The heavy-duty electric push rod (37) fixed on the bottom surface of the first moving block (35) is used to move the fixing device (4) vertically.

5. A lifting device with self-balancing function according to claim 4, characterized in that, The flat DC brushless motor (46) drives the rotating plate (47) to rotate, and drives the two slide rods (410) through the two arc grooves (48), causing the two moving rods (49) to move and expand, thereby causing the two fixed blocks (411) to expand and fix the inner wall of the container bottom fork slot.

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