Lifting sling with self-balancing function

Abstract

The invention relates to the technical field of lifting appliances, and particularly discloses a lifting appliance with a self-balancing function, which comprises a supporting device, a moving device, a clamping device, a fixing device, a rotary supporting bearing and a speed reducer, the moving device is arranged in an inner cavity of the supporting device and can move back and forth in the supporting device in a limited mode. The four clamping devices are arranged on the left side and the right side of the moving device correspondingly, and the moving device can drive the four clamping devices to clamp a container. The four fixing devices are arranged on the bottom faces of the four clamping devices correspondingly. The moving device drives a gear to rotate through a brake motor and drives a rack to be in linkage with a connecting rod, so that four sliding blocks move front and back in sliding grooves, the transverse distance between the clamping devices is accurately adjusted, fork pocket positions of containers of different sizes are rapidly matched, the lifting appliance can adapt to the containers of various specifications without replacing the lifting appliance, the equipment replacement time is greatly shortened, and the equipment replacement efficiency is improved. Loading and unloading efficiency is improved and operation cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of slings, in particular to a lifting sling with a self-balancing function. Background Art

[0002] In the field of container loading and unloading and transportation, the performance of the spreader, as the core component connecting the lifting equipment and the container, is directly related to the safety and efficiency of the operation. Existing spreaders generally adopt a plug-in fixed structure, and the initial connection is only achieved by inserting the plug-in rod into the fork groove at the bottom of the container. However, during transportation, especially when facing bumpy roads or inclined conditions, the container is prone to sliding or even falling off due to inertia or vibration, posing a serious safety hazard. Although some improvement plans have attempted to add a fixed structure, there are generally problems such as complex operation, delayed response or insufficient adaptability, which makes it difficult to meet the diverse operational needs.

[0003] In addition, traditional spreaders are usually designed for containers of specific sizes (such as 20-foot or 40-foot standard containers). Due to the differences in fork slot positions and sizes of different containers, spreaders need to be frequently replaced during operation, resulting in low loading and unloading efficiency, increased equipment operation complexity, and high additional costs. Therefore, developing a spreader device that is both highly safe and highly versatile has become a technical problem that needs to be solved urgently in this field. Summary of the invention

[0004] The purpose of the present invention is to provide a lifting device with a self-balancing function to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a lifting device with a self-balancing function, comprising a supporting device, a moving device, a clamping device, a fixing device, a slewing support bearing and a reducer, wherein the supporting device is used to be connected to a hook of a lifting loading and unloading vehicle; the moving device is arranged in the inner cavity of the supporting device, and the moving device can move forward and backward within the supporting device within a limited position; there are four clamping devices, which are respectively arranged on the left and right sides of the moving device, and the moving device can drive the four clamping devices to clamp the container; there are four fixing devices, which are respectively arranged on the bottom surfaces of the four clamping devices, and the four clamping devices can drive the four fixing devices to be inserted into the fork grooves at the bottom of the container, so that the fixing devices are fixed in the fork grooves at the bottom of the container; the slewing support bearing is arranged at the center of the supporting device; the reducer is arranged on the bottom surface of the top of the supporting device close to the center, and the gear at the output end of the reducer is meshed with the slewing support bearing, and the reducer can drive the slewing support bearing to rotate, so that the bottom of the supporting device connected to the outer ring of the slewing support bearing can rotate.

[0006] Preferably, for connecting with the loading and unloading truck hook, the support device includes lifting lugs, a connecting plate, a fixed cylindrical block, a fixed circular plate, a support plate, a first cavity, and a chute. There are two lifting lugs for connecting with the hook of the suspended loading and unloading truck. The connecting plate is arranged on the bottom surfaces of the two lifting lugs, and a speed reducer is fixedly arranged on the bottom surface of the connecting plate near the center. The fixed cylindrical block is arranged at the center of the bottom surface of the connecting plate. The fixed circular plate is arranged on the bottom surface of the fixed cylindrical block, and the inner ring of the slewing bearing is fixedly connected with the fixed circular plate through a screw. The support plate is arranged on the bottom surface of the outer ring of the slewing bearing, and the outer ring of the slewing bearing is fixedly connected with the top surface of the support plate through a screw. A first cavity is formed in the support plate, and chutes are formed on the left and right sides of the outer wall of the support plate, and both chutes penetrate into the first cavity.

[0007] Preferably, to drive the clamping device to be vertically aligned with the bottom fork slot of the loading and unloading truck, the moving device includes sliders, connecting rods, first grooves, racks, gears, and a braking motor. There are four sliders, which are respectively arranged in the two chutes and can be limited to move back and forth in the two chutes. Every two of the four sliders are aligned left and right as a group. There are two connecting rods, which are respectively arranged between the two groups of sliders. First grooves penetrating front and back are formed at the bottoms of the two connecting rods, and the two first grooves are offset. There are two racks, which are respectively arranged on one side of the outer walls of the two connecting rods. The two racks are respectively arranged in the two first grooves and can respectively move back and forth in the two first grooves. The gear is arranged between the two racks and meshes with the two racks. The gear is arranged at the center of the bottom of the first cavity through a rotating shaft. The braking motor is arranged at the center of the top of the first cavity, and the output end of the braking motor is fixedly connected with the gear.

[0008] Preferably, the braking motor drives the gear to rotate, so that the gear drives the two connecting rods to move telescopically through the racks, and thus the four sliders are respectively limited to move telescopically back and forth in the two chutes.

[0009] Preferably, to insert the fixing device into the fork slot, the clamping device includes a limiting rod, a second groove, a first moving slot, 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 slider. A second groove is formed on the bottom surface of the outer wall of the limiting rod, and first moving slots are formed on the front and back sides in the second groove. The electric push rod is arranged at the right end in the second groove. The first moving block is arranged at the output end of the electric push rod. There are two second moving blocks, which are respectively arranged on the front and back sides of the first moving block, and the two second moving blocks can respectively move left and right and be limited in the two first moving slots. A heavy-duty 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, and the heavy-duty electric push rod fixed on the bottom surface of the first moving block is used to vertically insert the fixing device into the container fork groove.

[0011] Preferably, in order to fix with the inner wall of the fork groove, the fixing device includes an insertion rod, a rectangular block, a second cavity, a second movable groove, a third groove, a flat DC brushless motor, a rotating plate, an arc groove, a movable rod, a sliding rod and a fixed block, the insertion 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 insertion rod, a second cavity penetrating from top to bottom is opened in the center of the rectangular block, second movable grooves are opened on the front and rear sides of the rectangular block, third grooves are opened on the front and rear ends of the top surface of the rectangular block, and the two third grooves are respectively penetrated into the two second movable grooves, the flat DC brushless motor is arranged on the bottom surface of the rectangular block, and the output end of the flat DC brushless motor penetrates into the second cavity. , a rotating plate is arranged at the output end of the flat DC brushless motor, and the rotating plate is arranged in the top of the second cavity and can rotate, and two arc grooves are opened on the surface of the rotating plate through the top and the bottom; there are two moving rods, which are respectively embedded in the two second moving grooves, and the two moving rods can respectively move forward and backward along the two second moving grooves, and one end of the two second moving grooves extends into the second cavity; there are two sliding rods, which are respectively arranged on the top surface of the extended end of the second moving groove, and the top ends of the two sliding rods are respectively arranged in one end of the arc groove, and the two sliding rods can respectively move in the two arc grooves; there are two fixed blocks, which are respectively arranged at the other end of the two moving rods.

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

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. Adapt to containers of various sizes: The mobile device drives the gear to rotate through the brake motor, driving the rack and the connecting rod to move the four sliders back and forth in the slide slot, accurately adjusting the lateral spacing of the clamping device, and quickly matching the fork slot position of containers of different sizes. It can adapt to containers of various specifications without changing the spreader, greatly reducing the time spent on equipment replacement, improving loading and unloading efficiency, and reducing operating costs.

[0014] 2. Double fixation: The fixing device adopts a double locking mechanism of "rod insertion and expansion fixation"; first, the rod is inserted into the container fork slot through a heavy-duty electric push rod to achieve a primary fixation; then the flat DC brushless motor drives the rotating plate to rotate, and the sliding rod and the moving rod are linked through the arc groove, so that the fixing block expands toward the inner wall of the fork slot to form a secondary mechanical lock; each fork slot is tightened in both directions by two fixing blocks, and the four fork slots are double fixed synchronously, which effectively resists vibration and inertia during transportation, eliminates the risk of sliding or falling off of the container, and significantly improves operational safety.

[0015] 3. Rotational balance: The slewing support bearing cooperates with the reducer to drive the support device to rotate smoothly through gear meshing, so that the container can flexibly adjust its posture during lifting while ensuring a stable center of gravity. This design not only improves the accuracy of loading and unloading operations, but also effectively reduces the risk of rollover caused by rotational imbalance, and is especially suitable for container transshipment under complex working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a schematic structural diagram of the supporting device of the present invention; Figure 3 It is a schematic structural diagram of the slewing support bearing of the present invention; Figure 4 It is a schematic diagram of the exploded structure of the slewing support bearing of the present invention; Figure 5 It is a structural schematic diagram of the mobile device of the present invention; Figure 6 It is a schematic diagram of the gear position structure of the mobile device of the present invention; Figure 7 It is a schematic diagram of the exploded structure of two racks of the mobile device of the present invention; Figure 8 It is a schematic diagram of the exploded structure of the gear assembly of the mobile device of the present invention; Figure 9 It is a schematic diagram of the brake motor position structure of the mobile device of the present invention; Figure 10 It is a schematic diagram of the structure of four clamping devices of the present invention; Figure 11 It is a schematic diagram of the cross-sectional structure of the limit rod of the clamping device of the present invention; Figure 12 It is a schematic diagram of the structure of four fixing devices of the present invention; Figure 13 It is a schematic diagram of the position structure of the fixing device of the present invention; Figure 14 It is a schematic diagram of the cross-sectional structure of a rectangular block of the fixing device of the present invention; Figure 15Schematic diagram of the third groove structure of the fixing device of the present invention; Figure 16 Schematic diagram of the sectional structure of the fixing device of the present invention; Figure 17 Schematic diagram of the fixing block structure of the fixing device of the present invention; Figure 18 Schematic diagram of the structure of the fixing device of the present invention.

[0017] In the figure: 1, support device; 2, moving device; 3, clamping device; 4, fixing device; 5, slewing support bearing; 6, reducer; 11, lifting lug; 12, connecting plate; 13, fixed cylindrical block; 14, fixed circular plate; 15, support plate; 16, first cavity; 17, chute; 21, slider; 22, connecting rod; 23, first groove; 24, rack; 25, gear; 26, braking motor; 31, limiting rod; 32, second groove; 33, first moving groove; 34, electric push rod; 35, first moving block; 36, second moving block; 37, heavy-duty electric push rod; 41, inserting rod; 42, rectangular block; 43, second cavity; 44, second moving groove; 45, third groove; 46, flat-type DC brushless motor; 47, rotating plate; 48, arc-shaped groove; 49, moving rod; 410, sliding rod; 411, fixing block. Detailed implementation manners

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] Please refer to Figures 1 - 18, the present invention provides a technical solution for a lifting spreader with a self - balancing function: It includes a support device 1, a moving device 2, a clamping device 3, a fixing device 4, a slewing bearing 5 and a speed reducer 6. The support device 1 is used to connect with the hook of a sling loader. The moving device 2 is arranged inside the support device 1, and the moving device 2 can be limited to move back and forth inside the support device 1. The number of the clamping devices 3 is four, which are respectively 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 the container. The number of the fixing devices 4 is four, which are respectively arranged on the bottom surfaces of the four clamping devices 3, and the four clamping devices 3 can drive the four fixing devices 4 to insert 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. The slewing bearing 5 is arranged at the center of the support device 1. The slewing bearing 5 has a certain load - bearing capacity and can bear the gravity of any size container with a certain stability. The speed reducer 6 is arranged on the bottom surface near the center at the top of the support device 1, and the gear at the output end of the speed reducer 6 meshes with the slewing bearing 5, and the speed reducer 6 can drive the slewing bearing 5 to rotate, so that the bottom of the support device 1 connected to the outer ring of the slewing bearing 5 can rotate. The cooperation of the moving device 2, the clamping device 3 and the fixing device 4 can be applicable to the fork slots of any size container, with a wide range of applications. The cooperation of the slewing bearing 5 and the speed reducer 6 can ensure the stability and safety of the rotation balance during container transportation, and the slewing bearing 5 and the speed reducer 6 can ensure the stability of the center of gravity when the container rotates.

[0020] As a preferred solution, further, as Figure 2 , Figure 3 and Figure 4 shown, the support device 1 includes a lifting lug 11, a connecting plate 12, a fixed cylindrical block 13, a fixed circular plate 14, a support plate 15, a first cavity 16 and a chute 17. The number of the lifting lugs 11 is two, which are used to connect with the hook of a sling loader. Wear - resistant bushings are arranged inside the lifting lugs 11 and are connected to the hook of the sling loader by quick - release pin shafts to support rapid loading and unloading. The connecting plate 12 is arranged on the bottom surfaces of the two lifting lugs 11. The speed reducer 6 is fixedly arranged on the bottom surface of the connecting plate 12 near the center. A rubber shock - absorbing pad is installed between the connecting plate 12 and the speed reducer 6 to reduce the influence of transmission vibration on the upper structure. The fixed cylindrical block 13 is arranged at the center of the bottom surface of the connecting plate 12. The fixed circular plate 14 is arranged on the bottom surface of the fixed cylindrical block 13. The inner ring of the slewing bearing 5 is fixedly connected to the fixed circular plate 14 by a screw. The support plate 15 is arranged on the bottom surface of the outer ring of the slewing bearing 5, and the outer ring of the slewing bearing 5 is fixedly connected to the top surface of the support plate 15 by a screw. A first cavity 16 is opened inside the support plate 15, and chutes 17 are opened on both the left and right sides of the outer wall of the support plate 15, and both of the two chutes 17 penetrate through to the inside of the first cavity 16.

[0021] As a preferred solution, further, asFigure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 As shown in, the mobile device 2 includes a slider 21, a connecting rod 22, a first groove 23, a rack 24, a gear 25 and a braking motor 26. The number of sliders 21 is four, which are respectively arranged in two sliding grooves 17 and can be limited to move back and forth in the two sliding grooves 17. Every two of the four sliders 21 are aligned left and right as a group. The four sliders 21 are made of wear-resistant material, which reduces the maintenance frequency of the equipment and extends the service life of the equipment; The number of connecting rods 22 is two, which are respectively arranged between two groups of sliders 21. The bottoms of the two connecting rods 22 are both provided with a first groove 23 that penetrates through from front to back, and the two first grooves 23 are offset. The opening of the two first grooves 23 enables the two racks 24 not to affect the two connecting rods 22 and thus move; The number of racks 24 is two, which are respectively arranged on one side of the outer walls of the two connecting rods 22. The two racks 24 are respectively arranged in the two first grooves 23, and the two racks 24 can respectively move back and forth in the two first grooves 23; The gear 25 is arranged between the two racks 24, and the gear 25 meshes with the two racks 24. The gear 25 is arranged at the center of the bottom of the first cavity 16 through a rotating shaft; The braking motor 26 is arranged at the center of the top of the first cavity 16, and the output end of the braking motor 26 is fixedly connected to the gear 25. The braking motor 26 can rotate bidirectionally, thereby driving the gear 25 to rotate bidirectionally. The braking motor 26 drives the gear 25 to rotate, so that the gear 25 drives the two connecting rods 22 to move and expand through the racks 24, so that the four sliders 21 are respectively limited to move back and forth and expand in the two sliding grooves 17. Through the mutual cooperation of the gear 25 and the two racks 24, the two connecting rods 22 are extended so that the four clamping devices 3 are respectively vertically aligned with the four fork grooves.

[0022] As a preferred solution, furthermore, as Figure 10 and Figure 11As shown in the figure, the clamping device 3 includes 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 slider 21. A second groove 32 is formed in the bottom surface of the outer wall of the limiting rod 31. First moving grooves 33 are formed in both the front and rear sides inside the second groove 32. The electric push rod 34 is arranged at the right end inside the second groove 32. The electric push rod 34 is a multi-section electric push rod, making the structure more compact. The first moving block 35 is arranged at the output end of the electric push rod 34. The number of the second moving blocks 36 is two, which are respectively arranged on the front and rear sides of the first moving block 35, and the two second moving blocks 36 can respectively move left and right in the two first moving grooves 33 in a limited way. The two second moving blocks 36 are made of wear-resistant materials to extend the service life of the equipment. The heavy-duty electric push rod 37 is arranged on the bottom surface of the outer wall of the first moving block 35. The first moving block 35 can bear the gravity at the bottom through the two second moving blocks 36 and has a certain load-bearing capacity.

[0023] As a preferred solution, further, as Figure 12 , Figure 13 , Figure 14 , Figure 15 , Figure 16 , Figure 17 and Figure 18As shown in the figure, the fixing device 4 includes 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 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. A second cavity 43 that penetrates up and down is provided in the center of the rectangular block 42. Second moving grooves 44 are provided on both the front and rear sides of the rectangular block 42. Third grooves 45 are provided at both the front and rear ends of the top surface of the rectangular block 42, and the two third grooves 45 respectively penetrate into the two second moving grooves 44. The flat DC brushless motor 46 is arranged on the bottom surface of the rectangular block 42, and the output end of the flat DC brushless motor 46 penetrates into the second cavity 43. The flat DC brushless motor 46 is flat, which can enable the fixing device 4 to be 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 inside the top of the second cavity 43 and can rotate. Two arc grooves 48 that penetrate up and down are provided on the surface of the rotating plate 47; the number of moving rods 49 is two, which are respectively embedded in the two second moving grooves 44, and the two moving rods 49 can respectively move forward and backward along the two second moving grooves 44 in a limited manner. One end of each of the two second moving grooves 44 extends into the second cavity 43. The two second moving grooves 44 respectively have the functions of limiting and supporting the two moving rods 49; the number of sliding rods 410 is two, which are respectively arranged on the top surface of the extended end of the second moving groove 44, and the tops of the two sliding rods 410 are respectively arranged inside one end of the arc groove 48, and the two sliding rods 410 can respectively move in a limited manner in the two arc grooves 48; the number of fixing blocks 411 is two, which are respectively arranged at the other ends of the two moving rods 49. The flat DC brushless motor 46 drives the rotating plate 47 to rotate, and drives the two sliding rods 410 through the two arc grooves 48 to move the two moving rods 49 to expand, so that the two fixing blocks 411 expand and fix the inner wall of the fork groove at the bottom of the container; this device can make the loading and unloading vehicle more stable during the process of rotating and transporting the container, and has safety. Inserting the four plug rods 41 into the four fork slots is a primary fixation. Because it is necessary to rotate to maintain the center stability during the transportation of the container, and in order to improve safety, the inner wall of one fork slot is fixed by the expansion of the two fixing blocks 411. Similarly, the inner walls of the four fork slots are all secondarily fixed by the two fixing blocks 411, which greatly improves the safety of this device for transporting the container.

[0024] The detailed connection means are well-known techniques in the art. The following mainly introduces the working principle and process, and the specific work is as follows.

[0025] The lifting lug 11 of the support device 1 is connected to the loading and unloading vehicle hook through a quick-release pin shaft. The connecting plate 12 is fixed to the reducer 6 through a rubber shock pad to form a load-bearing foundation. The inner ring of the slewing bearing 5 is connected to the fixed circular plate 14 through a screw, and the outer ring is fixed to the support plate 15, enabling the bottom device to rotate around the center; When the lifting appliance moves above the container, the braking motor 26 drives the gear 25 to rotate. Through the meshing rack 24, it drives the connecting rod 22 to move back and forth, and then pushes the slider 21 to slide in the chute 17. The four groups of sliders 21 are divided into left and right groups, and the two sliders 21 in each group move synchronously, making the lateral spacing of the clamping device 3 installed outside the slider 21 adjustable, and accurately aligning with the four fork slots at the bottom of the container; After the limiting rod 31 moves with the slider 21 to directly above the fork slot, the electric push rod 34 drives the first moving block 35 to move downward along the second groove 32, and the two second moving blocks 36 on both sides are limited to slide in the first moving slot 33 to ensure that the heavy-duty electric push rod 37 moves vertically downward; The heavy-duty electric push rod 37 pushes the insertion rod 41 into the fork slot at the bottom of the container to achieve a preliminary mechanical connection. At this time, the insertion rod 41 only bears the vertical load and is not fixed to the inner wall of the fork slot. It is necessary to further enhance the stability through secondary locking; After the insertion rod 41 is inserted into the fork slot, the flat-type DC brushless motor 46 drives the rotating plate 47 to rotate. The arc-shaped groove 48 on its surface drives the sliding rod 410 to move along the groove track. The sliding rod is fixedly connected to the moving rod 49. When the rotating plate 47 rotates, the sliding rod 410 makes a curvilinear motion in the arc-shaped groove 48, pushing the moving rod 49 to expand along the second moving slot 44 to both sides; The fixed block 411 at the end of the moving rod 49 expands with the moving rod 49 and closely adheres to the inner wall of the fork slot, forming a mechanical lock in the horizontal direction. Each fork slot is tightly clamped bidirectionally by two fixed blocks 411, and the four fork slots are synchronously secondarily fixed, significantly enhancing the connection strength between the lifting appliance and the container and resisting vibration and inertial forces during transportation; The gear 25 at the output end of the reducer 6 meshes with the outer ring of the slewing bearing 5. When it is necessary to adjust the attitude of the container, the reducer 6 drives the slewing bearing 5 to rotate, driving the support plate 15 and the bottom device to rotate. Since the inner ring of the slewing bearing 5 is fixed to the center of the support device 1, the outer ring of the slewing bearing 5 rotates synchronously with the container, ensuring the stability of the center of gravity during the rotation process and avoiding the risk of rollover caused by centrifugal force; During the lifting and transportation by the loading and unloading vehicle, the angle of the container can be adjusted through the support device 1 to meet the requirements of different loading and unloading positions; When encountering bumpy or inclined working conditions during transportation, the rotation balance mechanism can dynamically adjust the attitude of the container to further improve safety.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A lifting spreader with a self-balancing function, characterized in that, Comprising: A supporting device (1) for connecting with the hook of a suspended loading and unloading vehicle; A moving device (2) is arranged in the inner cavity of the supporting device (1), and the moving device (2) can be limited to move back and forth within the supporting device (1); A clamping device (3), with a quantity of four, which are respectively 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 the container; Fixing devices (4), with a quantity of four, which are respectively arranged on the bottom surfaces of the four clamping devices (3), and the four clamping devices (3) can drive the four fixing devices (4) to insert 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 bearing (5) is arranged at the center of the supporting device (1); A speed reducer (6) is arranged on the bottom surface near the center at the top of the supporting device (1), and the gear at the output end of the speed reducer (6) meshes with the slewing bearing (5), and the speed reducer (6) can drive the slewing bearing (5) to rotate, so that the bottom of the supporting device (1) connected to the outer ring of the slewing bearing (5) can rotate.

2. The lifting spreader with self - balancing function according to claim 1, characterized in that, The supporting device (1) includes: Two lifting lugs (11) for connecting with the hook of the suspended loading and unloading vehicle; A connecting plate (12) is arranged on the bottom surface of the two lifting lugs (11), and a speed reducer (6) is fixedly arranged on the bottom surface of the connecting plate (12) near the center; A fixed cylindrical block (13) is arranged at the center of the bottom surface of the connecting plate (12); A fixed circular plate (14) is arranged on the bottom surface of the fixed cylindrical block (13), and the inner ring of the slewing bearing (5) is fixedly connected to the fixed circular plate (14) through a screw; A support plate (15) is arranged on the bottom surface of the outer ring of the slewing bearing (5), and the outer ring of the slewing bearing (5) is fixedly connected to the top surface of the support plate (15) through a screw. A first cavity (16) is formed in the support plate (15), and sliding grooves (17) are formed on both the left and right sides of the outer wall of the support plate (15), and both of the two sliding grooves (17) penetrate through to the inside of the first cavity (16).

3. The lifting spreader with self - balancing function according to claim 2, wherein, The moving device (2) includes: Four sliders (21), which are respectively arranged in the two sliding grooves (17), and can be limited to move back and forth in the two sliding grooves (17). Every two of the four sliders (21) are aligned left and right as a group; Two connecting rods (22), which are respectively arranged between the two groups of sliders (21). First grooves (23) that penetrate through from front to back are formed at the bottoms of the two connecting rods (22), and the two first grooves (23) are offset; Two racks (24), which are respectively arranged on one side of the outer walls of the two connecting rods (22). The two racks (24) are respectively arranged in the two first grooves (23), and the two racks (24) can respectively move back and forth in the two first grooves (23); A gear (25) is arranged between the two racks (24), and the gear (25) meshes with the two racks (24). The gear (25) is arranged at the center of the bottom of the first cavity (16) through a rotating shaft; The braking motor (26) is arranged at the center of the top of the first cavity (16), and the output end of the braking motor (26) is fixedly connected to the gear (25).

4. The lifting spreader with self-balancing function according to claim 3, characterized in that, The braking motor (26) drives the gear (25) to rotate, so that the gear (25) drives the two connecting rods (22) to move telescopically through the rack (24), and thus the four sliders (21) are respectively limited to move telescopically back and forth in the two chutes (17).

5. A lifting spreader with a self - balancing function according to claim 4, characterized in that, The clamping device (3) includes: The limiting rod (31) is arranged on one side of the outer wall of the slider (21). A second groove (32) is formed on the bottom surface of the outer wall of the limiting rod (31), and first moving grooves (33) are formed on both the front and rear sides in the second groove (32); The electric push rod (34) is arranged at the right end in the second groove (32); The first moving block (35) is arranged at the output end of the electric push rod (34); The second moving blocks (36) are two in number and are respectively arranged on the front and rear sides of the first moving block (35), and the two second moving blocks (36) can respectively move left and right in the two first moving grooves (33) in a limited manner; The heavy-duty electric push rod (37) is arranged on the bottom surface of the outer wall of the first moving block (35).

6. A lifting spreader with a self-balancing function according to claim 5, 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 to the bottom surface of the first moving block (35) is used to vertically insert the fixing device (4) into the container fork slot.

7. The lifting spreader with a self-balancing function according to claim 6, characterized in that, The fixing device (4) includes: The insertion 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 insertion rod (41). A second cavity (43) is formed through the center of the rectangular block (42) from top to bottom. Second moving grooves (44) are formed on both the front and rear sides of the rectangular block (42). Third grooves (45) are formed at both the front and rear ends of the top surface of the rectangular block (42), and the two third grooves (45) respectively penetrate into the two second moving grooves (44); The flat DC brushless motor (46) is arranged on the bottom surface of the rectangular block (42), and the output end of the flat DC brushless motor (46) penetrates into the second cavity (43); The rotating plate (47) is arranged at the output end of the flat DC brushless motor (46), and the rotating plate (47) is arranged inside the top of the second cavity (43) and can rotate. Two arc-shaped grooves (48) are formed through the surface of the rotating plate (47); The moving rods (49) are two in number and are respectively embedded in the two second moving grooves (44), and the two moving rods (49) can respectively move back and forth in a limited manner along the two second moving grooves (44). One end of each of the two second moving grooves (44) extends into the second cavity (43); The sliding rods (410) are two in number and are respectively arranged on the top surface of the extended end of the second moving groove (44), and the top ends of the two sliding rods (410) are respectively arranged inside one end of the arc-shaped groove (48), and the two sliding rods (410) can respectively move in a limited manner in the two arc-shaped grooves (48); There are two fixing blocks (411), which are respectively arranged at the other ends of the two moving rods (49).

8. The lifting spreader with self-balancing function according to claim 7, characterized in that, The flat DC brushless motor (46) drives the rotating plate (47) to rotate, and drives the two sliding rods (410) through the two arc-shaped grooves (48) to move and expand the two moving rods (49), so that the two fixing blocks (411) expand and fix the inner walls of the fork slots at the bottom of the container.

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