A walking wheel type self-aligning tongs hoist for a crane

Abstract

The application provides a walking wheel type self-aligning clamp tongs hoist for a crane, and belongs to the technical field of crane hoists, and comprises two groups of walking guide rails arranged in parallel, a hoisting gantry is slidably connected on the walking guide rails, a gantry guide rail is fixedly arranged on the hoisting gantry, a walking wheel mechanism is slidably connected on the gantry guide rail, a lifting crane is fixedly installed on the walking wheel mechanism, a crane base plate is hoisted on the lifting crane, and the lifting crane is used for driving the crane base plate to move up and down. The inner clamping part and the outer clamping mechanism are integrated, and they can be used alone or in cooperation, the problem of single clamping form and poor universality of the traditional hoist is solved, and the hoisting demand of hollow articles with inner holes and solid articles without inner holes can be flexibly adapted.

Description

Technical Field

[0001] This invention belongs to the field of crane lifting equipment technology, specifically a self-centering clamp lifting equipment with a traveling wheel for cranes. Background Technology

[0002] Lifting and hoisting operations are a core component of modern industrial production, logistics, and engineering construction. Clamping devices, as key end-effectors of cranes, are widely used for loading, unloading, and handling various objects such as steel pipes, profiles, shafts, and components. With the diversification of industrial scenarios, the structural forms of the objects being lifted vary significantly. These range from hollow objects like pipes, cylinders, and coils with a central bore, to solid shafts, block-shaped components, and solid components without internal bores. This places higher demands on the adaptability, versatility, and clamping stability of lifting devices.

[0003] Currently, most conventional crane clamps and lifting devices are single-clamping types, with poor versatility and a narrow range of applications. Dedicated internal support lifting devices can only achieve clamping by tightening the inner hole, and cannot effectively grasp solid objects without an inner hole; dedicated external clamping devices can only clamp from the outside, and are prone to problems such as uneven clamping force, surface damage, and center of gravity shift when dealing with hollow parts such as pipes, and it is difficult to achieve precise centering. Summary of the Invention

[0004] The purpose of this application is to provide a self-centering clamping gripper for cranes with a traveling wheel, which solves the technical problems of traditional crane clamping grippers having a single clamping form, poor versatility, and limited adaptability.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a self-centering clamp lifting device with a traveling wheel type for a crane, comprising two sets of traveling guide rails arranged in parallel, a crane gantry frame slidably connected to the traveling guide rails, a gantry frame guide rail fixedly installed on the crane gantry frame, a traveling wheel mechanism slidably connected to the gantry frame guide rails, a lifting crane fixedly installed on the traveling wheel mechanism, a crane base plate suspended on the lifting crane, and the lifting crane being used to drive the crane base plate to move up and down; The crane base plate is equipped with a clamping drive, and both ends of the clamping drive are equipped with clamping components for fixing and clamping objects. The clamping drive is used to adjust the distance between the two sets of clamping components to achieve centering and clamping of both ends of the object. The clamping assembly includes a fixed support fixedly mounted on a clamping drive. The fixed support is provided with an inner clamping groove, and two sets of inner clamping members for clamping the inner holes of the object are slidably disposed in the inner clamping groove. The fixed support is also provided with an inner clamping drive for adjusting the relative distance between the two sets of inner clamping members. The fixed support is provided with two sets of outer clamping mechanisms for fixing and clamping the outer periphery of the object. The two sets of outer clamping mechanisms are rotatably mounted on the fixed support for adjusting the clamping position on the outer periphery of the object. The inner clamping groove is provided with an outer clamping groove to avoid the rotation of the outer clamping mechanisms. The inner clamping members and the outer clamping mechanisms can be used individually or in combination.

[0006] Preferably, the clamping drive includes a drive support fixedly installed on the crane base plate. Both sides of the drive support are slidably connected to drive guides. The drive guides are located outside the drive support and are fixedly connected to a mounting base plate via a connecting vertical rod. The mounting base plate is used to install the clamping assembly, and the mounting base plate is provided with a base plate guide groove to avoid the sliding of the two sets of inner clamping components.

[0007] Preferably, the drive support is a rectangular through-tube structure. Two sets of support plates are provided inside the drive support, dividing the drive support into a drive guide groove and a drive groove. The drive groove is located between the two sets of support plates, and a limiting guide rail is provided on the side of the support plate closest to the drive groove. The drive guide groove is used to guide and limit the sliding movement of the drive guide component. A drive motor is fixedly installed on the outer wall of the drive support at the center of the drive groove. The output shaft of the drive motor extends into the drive groove and is fixedly installed with a drive gear for driving the two sets of drive guide components to slide relative to each other.

[0008] Preferably, the drive guide includes a guide slide rod slidably disposed at the drive guide groove and a drive rack meshing and transmitting with the drive gear. Two sets of drive racks are distributed in a circular array on the outer periphery of the drive gear. The drive gear drives the two sets of drive racks to move in opposite directions. A rack limiting groove is provided on the side of the drive rack away from the drive gear. A limiting guide rail that cooperates with the rack limiting groove is provided on the support plate. The ends of the guide slide rod and the drive rack extending out of the drive support are fixedly connected by a connecting end plate. The connecting vertical rod is fixedly connected to the connecting end plate.

[0009] Preferably, the fixed support is fixedly mounted on the mounting base plate via a support shaft, a connecting bracket is rotatably mounted on the outer circumference of the support shaft, two sets of external clamping mechanisms are respectively fixedly connected to both ends of the connecting bracket, a driven gear is fixedly mounted on the connecting bracket, a driving gear is meshed on the driven gear, a rotary motor is fixedly mounted on the mounting base plate, and the driving gear is fixedly mounted on the output shaft of the rotary motor.

[0010] Preferably, the internal clamping drive includes a bidirectional lead screw rotatably installed in the internal clamping groove, and an internal clamping motor for driving the bidirectional lead screw to rotate is fixedly installed on the outer periphery of the fixed support. The two ends of the bidirectional lead screw are provided with threads in opposite directions, and two sets of lead screw slides are threadedly connected to the bidirectional lead screw. Both sets of lead screw slides are slidably connected in the internal clamping groove.

[0011] Preferably, the inner clamping component includes an inner clamping base plate disposed on the lead screw slide, an inner clamping adjustment seat is rotatably disposed on the inner clamping base plate, and limit mounting holes are provided around the inner clamping adjustment seat. An inner clamping plate is detachably installed at the limit mounting holes, and the inner clamping plate is replaced with an appropriate specification according to the type of the inner hole of the object.

[0012] Preferably: the inner clamping base plate is provided with four sets of limiting pins, the inner clamping adjusting seat is provided with limiting pin holes adapted to the limiting pins, the center of the inner clamping adjusting seat is provided with an adjusting through hole, a bearing seat is fixedly installed in the adjusting through hole, the inner ring of the bearing seat is slidably connected to an adjusting guide rod along the axial direction, and the adjusting guide rod is circumferentially fixedly connected to the inner ring of the bearing seat, one end of the adjusting guide rod is fixedly connected to the inner clamping base plate, and the other end is rotatably provided with a spring plate, a return spring is sleeved on the outer periphery of the adjusting guide rod, one end of the return spring is connected to the bearing seat, and the other end of the return spring is connected to the clamping assembly spring plate; Different types of inner clamping plates are pre-installed on the outer periphery of the outer clamping mechanism. When the corresponding inner clamping plate needs to be adjusted according to the different specifications of the inner hole of the object, first pull the inner clamping adjustment seat outward to separate the limiting pin hole from the limiting pin rod. Then rotate the inner clamping adjustment seat to rotate the corresponding inner clamping plate to face the inner hole of the object. Then release the inner clamping adjustment seat and move the inner clamping adjustment seat towards the inner clamping base plate under the elastic action of the return spring. Finally, the limiting pin rod is inserted into the limiting pin hole to complete the limiting and fixing of the inner clamping adjustment seat.

[0013] Preferably, the lead screw slide has two sets of slide slots parallel to the bidirectional lead screw. A U-shaped slide is slidably connected through the slide slots. Both ends of the U-shaped slide are fixedly connected to the inner clamping base plate. An electric telescopic rod is fixedly installed on the side of the lead screw slide away from the inner clamping base plate. The output end of the electric telescopic rod is fixedly connected to the U-shaped slide. The distance between the lead screw slide and the surface of the fixed support is not less than the height of the inner clamping adjustment seat. Under the action of the electric telescopic rod, the inner clamping adjustment seat can be completely retracted into the inner clamping slot, making the surface of the fixed support flat. When the object does not have an inner hole on its side, the inner clamping adjustment seat is retracted into the inner clamping slot, and clamping is achieved by the end face of the fixed support pressing against the side wall of the object. When the object has an inner hole on its side, the inner clamping adjustment seat extends out of the surface of the fixed support under the action of the electric telescopic rod to clamp the inner hole of the object.

[0014] Preferably, the external clamping mechanism includes an external clamping support fixedly connected to the end of the connecting bracket, an external clamping screw rotatably mounted inside the external clamping support, an external clamping motor for driving the external clamping screw to rotate fixedly mounted on the outer wall of the external clamping support, a threaded slider threadedly connected to the external clamping screw, the threaded slider slidably connected to the external clamping support, a disassembly and assembly clamping seat detachably mounted on the threaded slider, and an external clamping plate for clamping the outer periphery of the object provided on the disassembly and assembly clamping seat, the external clamping plate having different specifications according to the outer periphery shape of the object.

[0015] The beneficial effects of this invention are as follows: By integrating the inner clamping component and the outer clamping mechanism, and enabling them to be used individually or in combination, the problems of traditional lifting devices' single clamping form and poor versatility are solved. It can flexibly adapt to the lifting needs of hollow objects with inner holes and solid objects without inner holes. Simultaneously, by adjusting the spacing of the clamping components through the clamping drive, the two ends of the object are centered and clamped, preventing center of gravity shift and improving the stability and safety of the lifting operation. Attached Figure Description

[0016] The invention will now be further described with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the assembly structure of the clamping drive and clamping assembly of the present invention; Figure 3 This is a three-dimensional structural schematic diagram of the clamping assembly of the present invention; Figure 4 This is a schematic diagram of the main structure of the clamping assembly of the present invention; Figure 5 This is the present invention. Figure 4 Schematic diagram of the cross-sectional structure along the AA direction; Figure 6 This is a three-dimensional structural schematic diagram of the drive support of the present invention; Figure 7 This is a schematic diagram of the assembly structure of the drive guide component of the present invention; Figure 8 This is a three-dimensional structural schematic diagram of the clamping assembly of the present invention; Figure 9 This is an isometric structural diagram of the clamping assembly of the present invention; Figure 10 This is a schematic diagram of the main structure of the clamping assembly of the present invention; Figure 11 This is a bottom view of the clamping assembly of the present invention; Figure 12 This is a three-dimensional structural schematic diagram of the internal clamping component of the present invention; Figure 13 This is the present invention. Figure 12 Schematic diagram of the cross-sectional structure in the middle BB direction.

[0018] In the diagram: 1. Traveling guide rail; 2. Lifting gantry; 3. Gantry guide rail; 4. Wheel mechanism; 5. Lifting crane; 6. Crane base plate; 7. Clamping drive; 71. Drive support; 711. Support upright plate; 712. Drive guide groove; 713. Drive groove; 714. Limiting guide rail; 72. Drive motor; 73. Drive gear; 74. Drive guide component; 741. Guide slide rod; 742. Drive rack; 743. Connecting end plate; 75. Connecting vertical rod; 76. Mounting base plate; 761. Base plate guide groove; 77. Rotary motor; 8. Clamping assembly; 81. Fixed support; 811. Inner clamping groove; 812. Outer clamping groove; 82. Inner clamping component; 821. U-shaped slide; 822. Electric... 823. Telescopic rod; 8231. Inner clamping base plate; 8231. Limiting pin; 824. Inner clamping adjusting seat; 8241. Limiting mounting hole; 8242. Limiting pin hole; 8243. Adjusting through hole; 825. Bearing seat; 826. Adjusting guide rod; 827. Return spring; 828. Inner clamping plate; 83. Inner clamping drive; 831. Inner clamping motor; 832. Bidirectional lead screw; 833. Lead screw slide; 834. Slide through groove; 84. Outer clamping mechanism; 841. Outer clamping support; 842. Outer clamping motor; 843. Outer clamping lead screw; 844. Threaded slider; 845. Disassembly and assembly clamping seat; 846. Outer clamping plate; 85. Support shaft; 86. Driven gear; 87. Driving gear; 88. Connecting bracket. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0020] Traditional crane grippers are mostly single-clamping devices, lacking versatility and limited applicability. Dedicated internal-support grippers rely solely on internal expansion for clamping, failing to effectively grasp solid objects without internal holes. Dedicated external-clamp grippers can only clamp from the outside, easily leading to uneven clamping force, surface damage, and center of gravity shift in hollow tubular components, and making precise alignment difficult. These issues limit their application in diverse industrial scenarios.

[0021] Please see Figures 1-13As shown, this embodiment of the invention provides a self-centering clamping device with wheels for cranes. It achieves horizontal movement and positioning of the device by setting up two sets of parallel traveling guide rails 1, a crane gantry 2, a gantry guide rail 3, and a wheel mechanism 4. Vertical transport of objects is accomplished by raising and lowering the crane base plate 6 driven by the lifting crane 5. A clamping drive 7 is installed on the crane base plate 6, with clamping components 8 installed at both ends. The distance between the two sets of clamping components 8 can be adjusted to achieve centering clamping of both ends of the object. The clamping components 8 integrate an inner clamping member 82 and an outer clamping mechanism 84. The inner clamping member 82, with its spacing adjusted by the inner clamping drive 83, is used for inner hole clamping; the outer clamping mechanism 84 is rotatably installed for outer circumferential clamping. The inner clamping member 82 and the outer clamping mechanism 84 can be used individually or in combination, thus solving the problems of poor versatility and difficulty in centering of existing lifting devices.

[0022] In the hoisting operation area, two sets of parallel traveling guide rails 1 are installed. The traveling guide rails 1 can be constructed of steel rails or H-beams, laid on the ground or an elevated structure, providing a long-distance horizontal movement path for the entire hoisting system. The hoisting gantry 2 is slidably connected and mounted on the traveling guide rails 1. The hoisting gantry 2 can have a wheel assembly structure, with the wheels driven by a motor to roll along the traveling guide rails 1, thereby enabling the hoisting gantry 2 to move along the direction of the traveling guide rails 1 to cover different work positions.

[0023] A gantry rail 3 is fixedly installed on the gantry 2. The gantry rail 3 can be one or more rails parallel to the crossbeam of the gantry 2, such as I-beams or rectangular rails. A wheel mechanism 4 is slidably connected to the gantry rail 3. The wheel mechanism 4 can be composed of a trolley structure with rollers, driven by manual push-pull or chain drive mechanism, enabling it to move laterally on the gantry rail 3, thereby achieving the positioning of the lifting device in the span direction of the gantry 2.

[0024] A lifting hoist 5 is fixedly installed on the wheel mechanism 4. The lifting hoist 5 can be of various types, such as an electric hoist, pneumatic hoist, or hydraulic lift, and is securely fixed below the wheel mechanism 4. A hoist base plate 6 is mounted on the lifting hoist 5, and the lifting hoist 5 drives the hoist base plate 6 to move up and down. The hoist base plate 6 is connected to the lifting hoist 5 via wire rope, chain, or hydraulic rod. Driven by the lifting hoist 5, the hoist base plate 6 can achieve vertical lifting to meet the lifting needs of objects at different heights.

[0025] A clamping drive 7 is installed on the crane base plate 6. The clamping drive 7 can be in the form of a hydraulic cylinder, pneumatic cylinder, or screw drive mechanism, and is fixed below the crane base plate 6. Clamping components 8 for fixing and clamping objects are installed at both ends of the clamping drive 7. The clamping components 8 are fixed to the moving end of the clamping drive 7 by bolt connection or welding. The clamping drive 7 is used to adjust the distance between the two sets of clamping components 8, thereby achieving centering clamping of both ends of the object. For example, when the clamping drive 7 retracts inward, the distance between the two sets of clamping components 8 decreases; when the clamping drive 7 extends outward, the distance between the two sets of clamping components 8 increases. By controlling its stroke, the center of the object can be aligned with the center of the lifting device.

[0026] The clamping assembly 8 includes a fixed support 81 fixedly mounted on the clamping drive 7. The fixed support 81 can be a box structure or a frame structure, which is connected to the moving end of the clamping drive 7. An inner clamping groove 811 is provided on the fixed support 81. The inner clamping groove 811 can be a pair of parallel guide rails or channels for guiding the movement of the inner clamping members 82. Two sets of inner clamping members 82 for clamping the inner holes of the object are slidably arranged at the inner clamping groove 811. The inner clamping members 82 can be composed of clamping plates with sliders, whose sliders cooperate with the inner clamping groove 811 to ensure sliding.

[0027] The fixed support 81 is also equipped with an inner clamping drive 83 for adjusting the relative distance between the two sets of inner clamping members 82. The inner clamping drive 83 can be in the form of a manual screw, hydraulic cylinder, or pneumatic cylinder, etc., and is installed inside the fixed support 81 and connected to the two sets of inner clamping members 82. By driving the inner clamping drive 83, the two sets of inner clamping members 82 can be moved synchronously inward or outward to accommodate the inner holes of objects of different sizes.

[0028] In addition, the fixed support 81 is provided with two sets of external clamping mechanisms 84 for fixing and clamping the outer periphery of the object. The external clamping mechanism 84 can be composed of a linkage mechanism with clamping blocks, which is mounted on the side of the fixed support 81. The two sets of external clamping mechanisms 84 are rotatably mounted on the fixed support 81 for adjusting the position of clamping the outer periphery of the object. For example, the external clamping mechanism 84 can be connected to the fixed support 81 by a pin or a rotating shaft, and its angle can be adjusted manually or by a gear mechanism to accommodate the outer periphery of objects with different shapes.

[0029] The inner clamping groove 811 is provided with an outer clamping groove 812 to avoid the rotation of the outer clamping mechanism 84. The outer clamping groove 812 can be an arc-shaped or rectangular slot opened on the side wall or bottom of the inner clamping groove 811. Its size and position are designed so that when the outer clamping mechanism 84 rotates, its components will not interfere with the inner clamping groove 811 or the inner clamping member 82, ensuring the smooth operation of the mechanism.

[0030] The inner clamping component 82 and the outer clamping mechanism 84 can be used individually or in combination. When the object has an inner hole, only the inner clamping component 82 can be used for internal support clamping; when the object is solid or not suitable for internal support, only the outer clamping mechanism 84 can be used for external clamping; when the object requires improved clamping stability and safety, the inner clamping component 82 and the outer clamping mechanism 84 can be activated simultaneously to perform double clamping of the object from both inside and outside, thereby improving the versatility and adaptability of the lifting device.

[0031] This embodiment of the wheeled self-centering clamp lifting device integrates an inner clamping component 82 and an outer clamping mechanism 84, allowing them to be used individually or in combination. This solves the problems of traditional lifting devices having a single clamping method and poor versatility, and can flexibly adapt to the lifting needs of hollow objects with inner holes and solid objects without inner holes. At the same time, by adjusting the spacing of the clamping components 8 through the clamping drive 7, the two ends of the object are centered and clamped, avoiding center of gravity shift and improving the stability and safety of the lifting operation.

[0032] In some of the solutions mentioned above in this application, a clamping drive is proposed to adjust the distance between two sets of clamping components to achieve centering and clamping of the two ends of the object. However, in its implementation, there is a lack of reasonable design of the specific structure of the clamping drive, making it difficult to ensure the symmetrical and synchronous movement of the two sets of clamping components, failing to guarantee the centering and clamping accuracy of the object, and also failing to guarantee the guiding stability of the clamping components during movement. This will affect the reliability of the clamping and hoisting operation, and at the same time, it cannot provide a stable and suitable installation position for the clamping components, and cannot meet the sliding operation requirements of adjusting the distance of the inner clamping components.

[0033] In this regard, this application further proposes a self-centering clamp lifting device with a traveling wheel for cranes; please refer to [link to relevant documentation]. Figures 2-7 As shown, the clamping drive 7 includes a drive support 71 fixedly installed on the crane base plate 6. Both sides of the drive support 71 are slidably connected to drive guide members 74. The drive guide members 74 are located outside the drive support 71 and are fixedly connected to a mounting base plate 76 via a connecting vertical rod 75. The mounting base plate 76 is used to install the clamping assembly 8, and the mounting base plate 76 is provided with a base plate guide groove 761 for avoiding the sliding of the two sets of inner clamping members 82.

[0034] Through the above technical solution, this application optimizes the structure of the clamping drive 7. The clamping drive 7 forms a solid base by stably fixing the drive support 71 to the crane base plate 6. The drive guides 74, which are slidably connected on both sides of the drive support 71, precisely drive the external mounting base plate 76 to move through the connecting vertical rod 75. The mounting base plate 76 serves as the mounting platform for the clamping assembly 8, and the base plate guide groove 761 provided on it provides the necessary space for the sliding of the inner clamping member 82. When the drive guides 74 slide on the drive support 71, the mounting base plate 76 and the clamping assembly 8 mounted on it also move synchronously, thereby achieving precise adjustment and centering clamping of the distance between the two ends of the object.

[0035] This structural design effectively solves the problem of a lack of reasonable structural design in the clamping drive. First, the drive support 71, as a stable base, together with the drive guide 74 slidably connected on both sides, ensures that the two sets of clamping components 8 move symmetrically and synchronously when adjusting the spacing, significantly improving the centering and clamping accuracy of the object. Second, the sliding connection of the drive guide 74 on the drive support 71 provides precise guidance, ensuring the stability of the clamping components 8 during movement, effectively avoiding swaying and offset, thereby improving the reliability of clamping and lifting operations. Furthermore, the mounting base plate 76 is fixed to the drive guide 74 by the connecting vertical rod 75 and is located outside the drive support 71, providing ample and stable installation space for the clamping components 8 and avoiding structural interference. At the same time, the base plate guide groove 761 provided on the mounting base plate 76 is specifically designed to avoid the sliding of the inner clamping component 82, ensuring that the inner clamping component 82 is not obstructed by the mounting base plate 76 when adjusting the spacing, thus fully adapting to the sliding operation requirements of the inner clamping component 82. Overall, this solution, by clearly defining the specific components of the clamping drive 7, can not only stably drive the two sets of clamping components 8 to adjust the spacing to achieve centering and clamping, but also provide a stable installation foundation for the clamping components 8, while adapting to the sliding operation requirements of the inner clamping component 82, thus improving the reliability and rationality of the overall structure.

[0036] In some embodiments described above in this application, a clamping drive is proposed to adjust the relative distance between two sets of clamping components to achieve centering and clamping of both ends of an object. However, in its implementation, the original clamping drive's drive support lacks a reasonable internal space layout and a stable sliding limit guide structure, which can easily lead to displacement and misalignment during the drive transmission process. This makes it impossible to guarantee the synchronous and stable relative movement of the two sets of clamping components, which reduces the accuracy of centering and clamping the object and affects the stability of the clamping and hoisting process.

[0037] For this, please refer to Figures 2-7As shown, this application further proposes an optimized scheme for the drive support 71. The drive support 71 is designed as a rectangular through-tube structure, with two sets of support plates 711 inside. These two sets of support plates 711 cleverly divide the internal space of the drive support 71 into a drive guide groove 712 and a drive groove 713. The drive groove 713 is located between the two sets of support plates 711, and a limiting guide rail 714 is also provided on the side of the support plate 711 near the drive groove 713. The drive guide groove 712 is specifically used for sliding guidance and limiting of the drive guide member 74. Furthermore, a drive motor 72 is fixedly installed on the outer wall of the drive support 71 at the center of the drive groove 713. The output shaft of the drive motor 72 extends into the drive groove 713, and a drive gear 73 for driving the relative sliding of the two sets of drive guide members 74 is fixedly installed there.

[0038] Through the above technical solutions, the internal structure of the drive support 71 has been significantly optimized. The rectangular through-tube structure provides a regular and uniform installation space for the internal components, improving the compactness and rigidity of the overall structure. The two sets of support plates 711 precisely divide the internal space into drive guide grooves 712 and drive grooves 713, realizing the partitioned arrangement of functional components, effectively avoiding mutual interference between different components during operation, and ensuring smooth transmission operation. The central arrangement of the drive grooves 713 makes the drive components more evenly and symmetrically stressed, effectively avoiding abnormal structural wear caused by off-center loading, thereby extending the service life of the equipment. The limiting guide rails 714 and drive guide grooves 712 on the support plates 711 provide stable sliding guidance and limiting for the drive guide component 74, ensuring that the drive guide component 74 always maintains precise linear motion during movement, avoiding positional deviation and transmission misalignment. The drive motor 72 is mounted on the outer wall of the center of the drive slot 713 and drives the centrally located drive gear 73. This design ensures that the drive guides 74 on both sides are subjected to uniform force, significantly improving the synchronicity of the movement of the two sets of drive guides 74. Ultimately, these improvements collectively ensure the stability and accuracy of the two sets of clamping assemblies 8 during relative movement, thereby greatly improving the accuracy of centering and clamping the object. This effectively solves the problems of displacement and misalignment and low clamping accuracy that easily occur during the drive transmission process in the original solution, thus enhancing the stability and reliability of the entire clamping and lifting process.

[0039] In some of the embodiments described above in this application, a drive guide is proposed to cooperate with the drive gear to drive two sets of clamping components to move relative to each other, thereby achieving centering and clamping of the object. However, in the implementation process, conventional drive guide structures are prone to transmission offset and insufficient guiding accuracy, making it difficult to ensure that the two sets of clamping components move synchronously and symmetrically, and failing to guarantee the centering and clamping accuracy of the object. At the same time, the stability of the connection structure is insufficient, and it is easy to loosen and shake during the hoisting load, affecting the safety and stability of the clamping operation.

[0040] For this, please refer to Figures 2-7 As shown, this application further proposes a drive guide 74 including a guide slide rod 741 slidably disposed at the drive guide groove 712 and a drive rack 742 meshing and transmitting with the drive gear 73. The two sets of drive racks 742 are distributed in a ring array on the outer periphery of the drive gear 73. The drive gear 73 drives the two sets of drive racks 742 to move in opposite directions. A rack limiting groove is provided on the side of the drive rack 742 away from the drive gear 73. A limiting guide rail 714 that cooperates with the rack limiting groove is provided on the support plate 711. The ends of the guide slide rod 741 and the drive rack 742 extending out of the drive support 71 are fixedly connected by a connecting end plate 743. The connecting vertical rod 75 is fixedly connected to the connecting end plate 743.

[0041] Through the above technical solution, this application optimizes the specific structure of the drive guide 74, effectively solving the problems of offset jamming and insufficient guiding accuracy that may occur during drive movement, thereby significantly improving the symmetry and centering accuracy of the movement of the two sets of clamping components 8. Specifically, the drive guide 74 is divided into two independent parts: a guide slide 741 and a drive rack 742. This clearly defines the division of labor between sliding guidance and meshing transmission functions, avoiding the problem of easy wear and tear caused by excessive functional load on a single component, and improving the reliability of the overall structure. The two sets of drive racks 742 are distributed in a ring array on the outer periphery of the drive gear 73. The synchronous reverse movement of the two sets of drive racks 742 can be achieved by only one drive gear 73. This fundamentally ensures that the two sets of clamping components 8 always maintain symmetry during movement, providing a solid structural foundation for achieving precise centering and clamping of objects. Furthermore, a rack limiting groove is provided on the side of the drive rack 742 away from the drive gear 73, and it cooperates with the limiting guide rail 714 on the support plate 711 to precisely limit and guide the entire movement of the drive rack 742, effectively avoiding possible offset, shaking, jamming, or tooth disengagement during transmission, greatly improving the stability and reliability of the transmission system. Finally, the guide slide rod 741 and the extended end of the drive rack 742 are firmly connected by the connecting end plate 743, and the connecting vertical rod 75 is fixedly connected to this connecting end plate 743, ensuring the synchronous movement of the guide slide rod 741 and the drive rack 742, making the transmission action and guiding action highly consistent, and significantly enhancing the overall stability of the entire drive connection structure. This effectively avoids safety hazards caused by loose connections during heavy lifting operations, thereby ensuring the safety and stability of the clamping operation.

[0042] In some of the embodiments described above in this application, a clamping assembly is proposed to be mounted on a mounting base plate to cooperate with the clamping drive to adjust the centering and clamping of the object. However, in its implementation, the fixed support is simultaneously provided with an inner clamping member for clamping the inner hole of the object and an outer clamping mechanism for clamping the outer periphery of the object. The inner clamping member and the outer clamping mechanism need to meet the requirements of individual or combined use. The original installation method cannot flexibly adjust the position of the outer clamping mechanism. When the inner clamping member needs to be used alone, the outer clamping mechanism will interfere with the clamping operation. When the outer clamping mechanism needs to be used in combination or alone, it is impossible to adjust the outer clamping mechanism to a suitable clamping position. It is also difficult to adapt to the clamping requirements of objects with different structural forms and cannot meet the requirements of the universality of the lifting device.

[0043] In response, this application further proposes an improved method for installing the clamping assembly; please refer to [link / reference]. Figures 8-11 As shown, the fixed support 81 is fixedly installed on the mounting base plate 76 via the support shaft 85. The connecting bracket 88 is rotatably installed on the outer circumference of the support shaft 85. Two sets of external clamping mechanisms 84 are respectively fixedly connected to both ends of the connecting bracket 88. A driven gear 86 is fixedly installed on the connecting bracket 88. A driving gear 87 is meshed on the driven gear 86. A rotary motor 77 is fixedly installed on the mounting base plate 76. The driving gear 87 is fixedly installed on the output shaft of the rotary motor 77.

[0044] Through the above technical solution, this application proposes a rotatable and adjustable external clamping mechanism installation structure, effectively solving the problems of inflexible position adjustment and difficulty in adapting to different object clamping requirements in the prior art. Specifically, the fixed support 81 is fixedly installed on the mounting base plate 76 via the support shaft 85, and the external clamping mechanism 84 is set on the connecting bracket 88, which can rotate around the support shaft 85. This achieves flexible adjustment of the position of the external clamping mechanism 84, thereby meeting the needs of using the inner clamping component 82 and the external clamping mechanism 84 individually or in combination. This design keeps the position of the fixed support 81 and the inner clamping component 82 fixed, only adjusting the position of the external clamping mechanism 84, avoiding the impact on the original positioning accuracy of the inner clamping component 82, and ensuring the accuracy of object centering and clamping. At the same time, the two sets of external clamping mechanisms 84 are synchronously fixed at both ends of the connecting bracket 88. By rotating the connecting bracket 88, the synchronous position switching of the two sets of external clamping mechanisms 84 can be achieved, simplifying the adjustment process and improving operating efficiency. Furthermore, the transmission method employing the meshing of the driving gear 87 and the driven gear 86, powered by a rotary motor 77 fixedly mounted on the mounting base 76, drives the driven gear 86 and the connecting bracket 88 to rotate as a whole. This gear meshing transmission method features high precision and high stability, accurately adjusting the external clamping mechanism 84 to the target clamping position, ensuring accurate position adjustment. Simultaneously, the transmission structure exhibits good stability, capable of withstanding the forces exerted during clamping and lifting, thus enhancing the overall stability of the clamping operation. Mounting the rotary motor 77 on the mounting base 76 provides a stable mounting foundation for the rotary motor 77, ensuring the overall stability of the entire rotation adjustment structure and effectively preventing positional interference between the adjustment structure and other functional structures.

[0045] In some of the embodiments described above in this application, an internal clamping drive is proposed to adjust the relative distance between two sets of internal clamping members to clamp the inner holes of objects of different specifications. However, in the implementation process, ordinary drive structures are difficult to drive the two sets of internal clamping members to move synchronously in opposite directions at the same time, resulting in poor adjustment accuracy. It is impossible to ensure that the two sets of internal clamping members always adjust the distance in a centrally symmetrical manner, making it difficult to achieve self-centering clamping of objects and unable to stably adapt to the clamping requirements of inner holes of objects with different inner diameters.

[0046] For this, please refer to Figures 8-11 As shown, this application further proposes an internal clamping drive 83 including a bidirectional lead screw 832 rotatably installed in an internal clamping groove 811. An internal clamping motor 831 for driving the bidirectional lead screw 832 to rotate is fixedly installed on the outer periphery of the fixed support 81. The two ends of the bidirectional lead screw 832 are provided with threads in opposite directions. Two sets of lead screw slides 833 are threadedly connected to the bidirectional lead screw 832. Both sets of lead screw slides 833 are slidably connected in the internal clamping groove 811.

[0047] Through the above technical solution, the internal clamping drive 83 adopts a structure of bidirectional lead screw 832 and internal clamping motor 831, realizing the synchronous reverse movement of the two sets of internal clamping parts 82, effectively solving the problem that ordinary drive structures cannot guarantee the symmetrical adjustment of the spacing between the two sets of internal clamping parts 82. Specifically, the internal clamping motor 831 drives the bidirectional lead screw 832 to rotate. Since the threads at both ends of the bidirectional lead screw 832 turn in opposite directions, the two sets of lead screw slides 833 threaded on them can move in opposite directions at the same speed under the guidance of the internal clamping groove 811, thereby driving the internal clamping parts 82 to always maintain a symmetrical position relative to the center of the lifting device for spacing adjustment. This not only improves the adjustment accuracy and ensures the self-centering of the object during the clamping process, avoiding center of gravity shift, but also stably adapts to the clamping requirements of objects with different inner diameters, significantly improving the versatility and clamping stability of the lifting device. At the same time, fixing the internal clamping motor 831 to the outer periphery of the fixed support 81 avoids occupying the internal space of the internal clamping groove 811, which is conducive to structural compactness and maintenance convenience.

[0048] In some of the embodiments described above in this application, an inner clamping member is proposed for clamping the inner hole of an object. However, in its implementation, the inner clamping member can only be adapted to the inner hole of an object of a single specification. When it is necessary to adapt to the inner hole of an object of a different specification, the entire inner clamping member needs to be removed and replaced, which is cumbersome, costly, and difficult to flexibly meet the clamping needs of different inner holes of objects, resulting in poor versatility.

[0049] For this, please refer to Figures 8-13 As shown, this application further proposes an inner clamping member 82 including an inner clamping base plate 823 disposed on a lead screw slide 833. An inner clamping adjustment seat 824 is rotatably disposed on the inner clamping base plate 823. Limiting mounting holes 8241 are provided around the inner clamping adjustment seat 824. An inner clamping plate 828 is detachably installed at the limiting mounting holes 8241. The inner clamping plate 828 can be replaced with an appropriate specification according to the type of the inner hole of the object.

[0050] Through the above technical solution, an inner clamping adjustment seat 824 is rotatably mounted on the inner clamping base plate 823, and limiting mounting holes 8241 for detachable installation of the inner clamping plate 828 are provided around it. This application realizes the rapid adaptation of the inner clamping component 82 to the inner holes of objects of different specifications. When it is necessary to clamp objects with different inner hole specifications, the operator does not need to disassemble the entire inner clamping component 82, but only needs to rotate the inner clamping adjustment seat 824 to switch the adapted inner clamping plate 828 pre-installed at different limiting mounting holes 8241 to the working position. In addition, if it is necessary to replace or supplement the inner clamping plate 828, its detachable installation feature also makes the replacement process simple and quick. This design significantly improves the versatility and operating efficiency of the lifting device, reduces the adaptation cost and time caused by changes in object specifications, and enables the crane clamp lifting device to flexibly cope with diverse industrial clamping needs, avoiding the limitations of traditional single-specification inner clamping components.

[0051] In some of the solutions mentioned above in this application, an inner clamping component is proposed to clamp the inner hole of an object. The inner clamping plate can be replaced with an appropriate specification according to the type of the inner hole of the object. However, the existing replacement method requires disassembling and replacing different inner clamping plates, which is cumbersome and requires repeated alignment and calibration. This not only reduces the efficiency of clamping operations, but also easily leads to clamping position deviation, affecting the accuracy of clamping alignment. It is also difficult to quickly adapt to the inner holes of objects of different specifications, and it is difficult to balance adjustment efficiency and clamping accuracy.

[0052] For this, please refer to Figures 8-13As shown, this application proposes an improved internal clamping component. The internal clamping base plate 823 is provided with four sets of limiting pins 8231. The internal clamping adjusting seat 824 is provided with limiting pin holes 8242 adapted to the limiting pins 8231. An adjusting through hole 8243 is provided at the center of the internal clamping adjusting seat 824. A bearing seat 825 is fixedly installed in the adjusting through hole 8243. An adjusting guide rod 826 is axially slidably connected to the inner ring of the bearing seat 825, and the adjusting guide rod 826 is circumferentially fixedly connected to the inner ring of the bearing seat 825. One end of the adjusting guide rod 826 is fixedly connected to the internal clamping base plate 823, and a spring plate is rotatably provided at the other end. A return spring 827 is sleeved on the outer periphery of the adjusting guide rod 826. One end of the spring 827 is connected to the bearing seat 825, and the other end of the return spring 827 is connected to the spring plate of the clamping assembly 8. Different types of inner clamping plates 828 are pre-installed on the outer periphery of the outer clamping mechanism 84. When the corresponding inner clamping plate 828 needs to be adjusted according to the different specifications of the inner hole of the object, the inner clamping adjustment seat 824 is first pulled outward to separate the limiting pin hole 8242 from the limiting pin rod 8231. Then, the inner clamping adjustment seat 824 is rotated to rotate the corresponding inner clamping plate 828 to face the inner hole of the object. Then, the inner clamping adjustment seat 824 is released and moves towards the inner clamping base plate 823 under the elastic action of the return spring 827. Then, the limiting pin rod 8231 is inserted into the limiting pin hole 8242 to complete the limiting and fixing of the inner clamping adjustment seat 824.

[0053] Through the above technical solution, this application sets four sets of limiting pins 8231 on the inner clamping base plate 823 and sets matching limiting pin holes 8242 on the inner clamping adjusting seat 824, realizing multi-angle precise alignment and fixation of the inner clamping adjusting seat 824 after rotational adjustment. This design avoids the tedious process of repeatedly disassembling and assembling the inner clamping plate 828 in the traditional method, significantly improving the replacement efficiency of the inner clamping plate 828. Specifically, a bearing seat 825 is fixedly installed in the adjusting through hole 8243 set in the center of the inner clamping adjusting seat 824. The inner ring of the bearing seat 825 and the adjusting guide rod 826 achieve axial sliding connection and circumferential fixed connection. This structure allows the inner clamping adjusting seat 824 to move axially to release or restore the limiting position, and to rotate around the adjusting guide rod 826 for adjustment. The two actions are independent of each other and do not interfere with each other, greatly improving the reliability of operation. One end of the adjusting guide rod 826 is fixed to the inner clamping base plate 823, and the other end is rotatably equipped with a spring plate and a return spring 827. One end of the return spring 827 is connected to the bearing seat 825, and the other end is connected to the spring plate of the clamping assembly 8. When the operator pulls the inner clamping adjusting seat 824 outward, the limiting pin hole 8242 separates from the limiting pin rod 8231. At this time, the inner clamping adjusting seat 824 can be rotated freely to rotate the inner clamping plates 828 of different specifications that are pre-installed on the outer periphery of the outer clamping mechanism 84 to the desired position. Once the inner clamping adjusting seat 824 is released, the elastic force of the return spring 827 will automatically push the inner clamping adjusting seat 824 toward the inner clamping base plate 823, so that the limiting pin rod 8231 automatically inserts into the limiting pin hole 8242, completing the limiting and fixing of the inner clamping adjusting seat 824. With the above technical solution, operators only need three simple actions—"pull, rotate, and release"—to quickly and accurately switch between inner clamping plates 828 of different specifications, without the need for complex disassembly, assembly, and alignment calibration. This not only significantly improves the efficiency of clamping operations and reduces operation time, but also ensures the positional accuracy and clamping centering accuracy of the inner clamping plate 828 after switching. It effectively solves the problems of cumbersome, inefficient, and inaccurate inner clamping plate replacement operations in existing technologies, enabling the lifting device to quickly adapt to the inner holes of objects of different specifications, thus improving the versatility and operational flexibility of the lifting device.

[0054] In some of the embodiments described above in this application, an inner clamping member is proposed to clamp the inner hole of an object, working in conjunction with an outer clamping mechanism to meet the clamping requirements of different objects. However, in actual lifting operations, not all objects being lifted have inner holes. When clamping solid objects without inner holes on the sides, the originally protruding inner clamping member will protrude from the surface of the fixed support. On the one hand, this will occupy the clamping operation space of the fixed support, interfere with the top pressure clamping of the object by the side wall of the fixed support, and fail to guarantee the stability of the clamping. On the other hand, the protruding inner clamping member is prone to scraping and bumping against the outer wall of the object, and may even cause structural damage to the inner clamping member due to additional force. It cannot meet the clamping requirements of objects with and without inner holes, affecting the versatility and adaptability of the lifting tool.

[0055] For this, please refer to Figures 8-13 As shown, the lead screw slide 833 is provided with two sets of slide slots 834 parallel to the bidirectional lead screw 832. A U-shaped slide 821 is slidably connected through the slide slots 834. The two ends of the U-shaped slide 821 are fixedly connected to the inner clamping base plate 823. An electric telescopic rod 822 is fixedly installed on the side of the lead screw slide 833 away from the inner clamping base plate 823. The output end of the electric telescopic rod 822 is fixedly connected to the U-shaped slide 821, and the distance between the lead screw slide 833 and the surface of the fixed support 81 is not less than that of the inner clamping base 822. Adjusting the height of the inner clamping adjustment seat 824 allows it to be fully retracted into the inner clamping groove 811 under the action of the electric telescopic rod 822, making the surface of the fixed support 81 flat. When the object does not have an inner hole on its side, the inner clamping adjustment seat 824 is retracted into the inner clamping groove 811, and clamping is achieved by pressing the end face of the fixed support 81 against the side wall of the object. When the object has an inner hole on its side, the inner clamping adjustment seat 824 extends out of the surface of the fixed support 81 under the action of the electric telescopic rod 822 to clamp the inner hole of the object.

[0056] Through the above technical solution, this application provides a slide groove 834 parallel to the bidirectional lead screw 832 on the lead screw slide 833, and allows the U-shaped slide 821 to slide through and be connected to this groove. Simultaneously, both ends of the U-shaped slide 821 are fixedly connected to the inner clamping base plate 823, thus providing a stable and controlled telescopic guide structure for the inner clamping member 82. The electric telescopic rod 822 is fixedly installed on the side of the lead screw slide 833 away from the inner clamping base plate 823, and its output end is fixedly connected to the U-shaped slide 821, enabling the electric telescopic rod 822 to precisely drive the U-shaped slide 821, thereby driving the inner clamping base plate 823 and the inner clamping adjustment seat 824 to telescopically move. When the side of the suspended object does not have an inner hole, the electric telescopic rod 822 can drive the inner clamping adjustment seat 824 to fully retract into the inner clamping slide groove 811. Because the distance between the lead screw slide 833 and the surface of the fixed support 81 is not less than the height of the inner clamping adjustment seat 824, it ensures that the inner clamping adjustment seat 824 can be fully submerged, keeping the surface of the fixed support 81 flat. At this time, the flat end face of the fixed support 81 can directly press and clamp the side wall of the object, avoiding interference from protruding parts and effectively preventing the inner clamping component 82 from rubbing against or damaging the object, thus ensuring the stability and safety of the clamping. When the object being lifted has an inner hole on its side, the electric telescopic rod 822 drives the inner clamping adjustment seat 824 to extend out of the surface of the fixed support 81, allowing it to enter the inner hole of the object and clamp it. This telescopic and adjustable structure allows the inner clamping component 82 to flexibly adjust its working state according to whether the object has an inner hole, greatly improving the adaptability and versatility of the lifting device for objects with different structures. Meanwhile, the use of the slide groove 834 on the lead screw slide 833 as a guide simplifies the structural design, reduces complexity, and ensures the structural stability of the inner clamping member 82 during the extension and retraction process.

[0057] In some of the solutions mentioned above in this application, an external clamping mechanism is proposed to adjust the position of clamping the outer periphery of an object, thereby achieving a fixed clamping of the outer periphery of the object. It can be used in conjunction with an internal clamping component or independently. However, in its implementation, only the installation and position adjustment method of the external clamping mechanism is limited. The specific clamping drive structure of the external clamping mechanism and the design for adapting to objects of different shapes and sizes are not given. It is impossible to guarantee stable clamping of objects of different shapes and sizes, and it is also difficult to change the appropriate clamping part according to the shape of the outer periphery of the object. This will reduce the versatility and clamping stability of the lifting device and fail to meet the lifting needs of diversified industrial scenarios.

[0058] For this, please refer to Figures 8-11As shown, the external clamping mechanism 84 includes an external clamping support 841 fixedly connected to the end of the connecting bracket 88. An external clamping screw 843 is rotatably installed inside the external clamping support 841. An external clamping motor 842 for driving the external clamping screw 843 to rotate is fixedly installed on the outer wall of the external clamping support 841. A threaded slider 844 is threadedly connected to the external clamping screw 843. The threaded slider 844 is slidably connected to the external clamping support 841. A disassembly and assembly clamping seat 845 is detachably installed on the threaded slider 844. An external clamping plate 846 for clamping the outer periphery of an object is provided on the disassembly and assembly clamping seat 845. The external clamping plate 846 is provided with different specifications according to the outer periphery shape of the object.

[0059] Through the above technical solution, this application provides a specific adjustable and adaptable structural design for the external clamping mechanism 84, which can meet the peripheral clamping needs of objects with different shapes and sizes, and improve the versatility and clamping stability of the lifting device. The external clamping support 841 is fixedly connected to the end of the connecting bracket 88 and can rotate with the connecting bracket 88 to adjust to the appropriate clamping position, providing a stable installation foundation for the entire external clamping action. The clamping position is pre-adjusted based on the existing rotation adjustment structure. The external clamping screw 843 is rotatably installed inside the external clamping support 841, and the external clamping motor 842 is fixed on the outside of the external clamping support 841 to drive the external clamping screw 843 to rotate. It can convert the rotational power output by the external clamping motor 842 into linear motion driving force. The structure is stable and the drive is reliable, providing stable power output for the clamping action. The external clamping screw 843 is threadedly connected to a threaded slider 844, which is slidably connected to the external clamping support 841. When the external clamping screw 843 rotates, it drives the threaded slider 844 to move linearly along the external clamping support 841, thereby adjusting the relative position of the external clamping plate 846. This enables clamping and releasing operations on objects of different sizes, adapting to the lifting needs of objects of different sizes. A detachable mounting and disassembly clamp 845 can be installed on the threaded slider 844, ensuring the structural stability of the mounting and disassembly clamp 845 after installation and facilitating quick replacement of the mounting and disassembly clamp 845 and the external clamping plate 846 to adapt to different usage requirements. An outer clamping plate 846 is provided on the disassembly and assembly clamping base 845. The outer clamping plate 846 can be prepared in advance according to different specifications based on the outer circumference shape of the object. After replacing the appropriate outer clamping plate 846 for objects with different shapes, it can ensure that the clamping force is evenly distributed, avoid damage to the surface of the object, and ensure the stability of clamping. It is suitable for lifting operations of various types of objects and effectively improves the versatility of the entire lifting tool.

[0060] The following example will provide a more detailed explanation of the above technical solution: In a large industrial production facility, users frequently need to lift and move heavy objects of various shapes and sizes. These objects include steel pipes with a central bore, solid steel shafts, and rectangular steel plates without bores. Traditional single-clamp lifting devices cannot meet this diverse need, resulting in low operational efficiency and often causing problems such as uneven clamping force, surface damage, or center of gravity shift when clamping hollow parts.

[0061] To address the aforementioned issues, the base introduced a novel self-centering wheeled lifting device. The device's overall structure achieves a wide range of horizontal movement through two sets of parallel travel rails 1. The lifting gantry 2 is slidably connected to the travel rails 1, further expanding the device's working area. A gantry guide rail 3 is fixedly mounted on the lifting gantry 2, and the wheel mechanism 4 is slidably connected to the gantry guide rail 3, allowing the lifting device to move laterally within the span of the gantry 2, thereby precisely positioning it above the object to be lifted.

[0062] Once the lifting device is positioned, the lifting hoist 5, fixedly mounted on the wheel mechanism 4, begins operation, driving the hoist base plate 6 to move up and down, lowering the entire clamping mechanism above the object. The hoist base plate 6 is equipped with a clamping drive 7, with clamping components 8 at both ends. The core of the clamping drive 7 lies in its self-centering function; it automatically adjusts the distance between the two sets of clamping components 8 according to the width of the object, ensuring that the object is centered in the lifting device when clamped, avoiding the center-of-gravity shift problem caused by manual misalignment in traditional lifting devices.

[0063] Taking the clamping of a large steel pipe as an example. First, the clamping drive 7 adjusts the distance between the two sets of clamping components 8 to roughly match the length of the steel pipe. Then, the lifting crane 5 lowers the lifting device, bringing the clamping components 8 close to both ends of the steel pipe.

[0064] At this time, the inner clamping member 82 in the clamping assembly 8 comes into play for the inner hole of the steel pipe. The inner clamping drive 83 starts to work, and the threads at both ends of the bidirectional lead screw 832 are opposite, driving the two sets of lead screw slides 833 to slide relative to each other in the inner clamping groove 811. The lead screw slides 833 are connected to the inner clamping base plate 823 through the U-shaped slide 821. The electric telescopic rod 822 on the inner clamping base plate 823 extends out, pushing the inner clamping adjusting seat 824 out of the surface of the fixed support 81. User A can, according to the specifications of the inner hole of the steel pipe, pull the inner clamping adjusting seat 824 to separate its limiting pin hole 8242 from the limiting pin rod 8231 on the inner clamping base plate 823, and then rotate the inner clamping adjusting seat 824 to select the matching inner clamping plate 828 pre-installed at the limiting mounting hole 8241, so that it faces the inner hole of the steel pipe. After releasing the inner clamping adjusting seat 824, the elastic action of the return spring 827 resets it and it is re-limited and fixed by the limiting pin rod 8231. Subsequently, the inner clamping drive 83 further drives the inner clamping member 82 to expand outward, so that the inner clamping plate 828 firmly clamps the inner wall of the steel pipe.

[0065] Meanwhile, to provide more stable clamping, the external clamping mechanism 84 can also be used in conjunction. The rotary motor 77 on the mounting base plate 76 drives the drive gear 87, which meshes with the driven gear 86 on the connecting bracket 88, causing the connecting bracket 88 to rotate. This rotates the two sets of external clamping mechanisms 84, adjusting their angles so that the external clamping support 841 aligns with the outer circumference of the steel pipe. The external clamping motor 842 drives the external clamping screw 843, causing the threaded slider 844 and its mounting / dismounting clamp 845 to move inward, clamping the outer circumference of the steel pipe. The external clamping groove 812 on the internal clamping groove 811 ensures that the external clamping mechanism 84 does not interfere with the internal clamping component 82 when rotating. This coordinated internal and external clamping method significantly improves the clamping stability and safety of hollow objects, effectively avoiding surface damage and center of gravity shift problems that may occur with traditional external clamping lifting devices.

[0066] The versatility of the lifting device is demonstrated when it is necessary to clamp a solid steel shaft or a rectangular steel plate. The clamping drive 7 also performs self-centering adjustment. Since the object has no inner hole, the electric telescopic rod 822 fully retracts the inner clamping adjustment seat 824 into the inner clamping groove 811, making the surface of the fixed support 81 flat. At this time, the outer clamping mechanism 84 becomes the main clamping means. The rotary motor 77 adjusts the angle of the outer clamping mechanism 84 so that its outer clamping support 841 is aligned with the outer periphery of the object. User A can replace the suitable outer clamping plate 846 on the disassembly and assembly clamping seat 845 according to the external shape of the object. The outer clamping motor 842 drives the outer clamping screw 843 to fix and clamp the outer clamping plate 846 to the outer periphery of the object. For rectangular steel plates without inner holes, the end face of the fixed support 81 can even be used to directly press and clamp the side wall of the object after the inner clamping adjustment seat 824 is fully retracted.

[0067] Through the above operations, this wheeled self-centering clamping spreader can flexibly handle various types of objects, including those with internal holes, those without internal holes, and solid or hollow objects, achieving precise centering and clamping. It also provides multiple clamping modes, including internal clamping, external clamping, or a combination of both. This design overcomes the limitations of traditional single-clamping spreaders, which suffer from poor versatility and narrow adaptability, significantly improving the efficiency, safety, and object protection of lifting operations.

[0068] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A self-centering clamp lifting device with a traveling wheel for cranes, characterized in that: It includes two sets of parallel walking guide rails (1), a lifting gantry (2) is slidably connected on the walking guide rails (1), a gantry guide rail (3) is fixedly installed on the lifting gantry (2), a wheel mechanism (4) is slidably connected on the gantry guide rail (3), a lifting crane (5) is fixedly installed on the wheel mechanism (4), a crane seat plate (6) is hoisted on the lifting crane (5), and the lifting crane (5) is used to drive the crane seat plate (6) to move up and down; The crane base plate (6) is equipped with a clamping drive (7), and both ends of the clamping drive (7) are equipped with clamping components (8) for fixing and clamping objects. The clamping drive (7) is used to adjust the distance between the two sets of clamping components (8) to achieve centering and clamping of the two ends of the object. The clamping assembly (8) includes a fixed support (81) fixedly mounted on the clamping drive (7). The fixed support (81) is provided with an inner clamping groove (811). Two sets of inner clamping members (82) for clamping the inner hole of the object are slidably arranged in the inner clamping groove (811). The fixed support (81) is provided with an inner clamping drive (83) for adjusting the relative distance between the two sets of inner clamping members (82). The fixed support (81) is provided with two sets of outer clamping mechanisms (84) for fixing and clamping the outer periphery of the object. The two sets of outer clamping mechanisms (84) are rotatably mounted on the fixed support (81) for adjusting the position of clamping the outer periphery of the object. The inner clamping groove (811) is provided with an outer clamping groove (812) for avoiding the rotation of the outer clamping mechanism (84). The inner clamping members (82) and the outer clamping mechanisms (84) can be used alone or in combination. The inner clamping component (82) includes an inner clamping base plate (823) disposed on a lead screw slide (833). An inner clamping adjustment seat (824) is rotatably disposed on the inner clamping base plate (823). Limiting mounting holes (8241) are provided around the inner clamping adjustment seat (824). An inner clamping plate (828) is detachably installed at the limiting mounting holes (8241). The inner clamping plate (828) can be replaced with a suitable specification according to the type of the inner hole of the object. The inner clamping base plate (823) is provided with four sets of limiting pins (8231), the inner clamping adjusting seat (824) is provided with limiting pin holes (8242) that are adapted to the limiting pins (8231), the center of the inner clamping adjusting seat (824) is provided with an adjusting through hole (8243), a bearing seat (825) is fixedly installed in the adjusting through hole (8243), and the inner ring of the bearing seat (825) is slidably connected to the adjusting guide rod (826) along the axial direction. Furthermore, the adjusting guide rod (826) is circumferentially fixedly connected to the inner ring of the bearing housing (825). One end of the adjusting guide rod (826) is fixedly connected to the inner clamping base plate (823), and the other end is rotatably provided with a spring plate. A return spring (827) is sleeved on the outer periphery of the adjusting guide rod (826). One end of the return spring (827) is connected to the bearing housing (825), and the other end of the return spring (827) is connected to the spring plate of the clamping assembly (8). Different types of inner clamping plates (828) are pre-installed on the outer periphery of the outer clamping mechanism (84). When the corresponding inner clamping plate (828) needs to be adjusted according to the different specifications of the inner hole of the object, the inner clamping adjustment seat (824) is first pulled outward to separate the limiting pin hole (8242) from the limiting pin rod (8231). Then, the inner clamping adjustment seat (824) is rotated to rotate the corresponding inner clamping plate (828) to face the inner hole of the object. Then, the inner clamping adjustment seat (824) is released and moves towards the inner clamping base plate (823) under the elastic action of the return spring (827). Then, the limiting pin rod (8231) is inserted into the limiting pin hole (8242) to complete the limiting and fixing of the inner clamping adjustment seat (824).

2. The self-centering clamp lifting device for a crane with a traveling wheel as described in claim 1, characterized in that: The clamping drive (7) includes a drive support (71) fixedly installed on the crane base plate (6). Both sides of the drive support (71) are slidably connected to drive guides (74). The drive guides (74) are located outside the drive support (71) and are fixedly connected to a mounting base plate (76) via a connecting vertical rod (75). The mounting base plate (76) is used to install the clamping assembly (8), and the mounting base plate (76) is provided with a base plate guide groove (761) to avoid the sliding of the two sets of inner clamping components (82).

3. A self-centering clamp lifting device for a crane with a traveling wheel, as described in claim 2, characterized in that: The drive support (71) is a rectangular through-tube structure. Two sets of support plates (711) are provided inside the drive support (71). The two sets of support plates (711) divide the drive support (71) into a drive guide groove (712) and a drive groove (713). The drive groove (713) is located between the two sets of support plates (711). A limit guide rail (714) is provided on the side of the support plate (711) near the drive groove (713). The drive guide groove (712) is used to guide and limit the sliding of the drive guide (74). A drive motor (72) is fixedly installed on the outer wall of the drive support (71) located at the center of the drive groove (713). The output shaft of the drive motor (72) extends into the drive groove (713) and a drive gear (73) for driving the two sets of drive guides (74) to slide relative to each other is fixedly installed.

4. A self-centering clamp lifting device for a crane with a traveling wheel as described in claim 3, characterized in that: The drive guide (74) includes a guide slide rod (741) slidably disposed in the drive guide groove (712) and a drive rack (742) meshing and transmitting with the drive gear (73). Two sets of drive racks (742) are arranged in a ring array on the outer periphery of the drive gear (73). The drive gear (73) drives the two sets of drive racks (742) to move in opposite directions. A rack limiting groove is provided on the side of the drive rack (742) away from the drive gear (73). A limiting guide rail (714) that cooperates with the rack limiting groove is provided on the support plate (711). The ends of the guide slide rod (741) and the drive rack (742) extending out of the drive support (71) are fixedly connected by a connecting end plate (743). The connecting vertical rod (75) is fixedly connected to the connecting end plate (743).

5. A self-centering clamp lifting device for a crane with a traveling wheel as described in claim 2, characterized in that: The fixed support (81) is fixedly mounted on the mounting base plate (76) via the support shaft (85). A connecting bracket (88) is rotatably mounted on the outer circumference of the support shaft (85). Two sets of external clamping mechanisms (84) are fixedly connected to both ends of the connecting bracket (88). A driven gear (86) is fixedly mounted on the connecting bracket (88). A driving gear (87) is meshed on the driven gear (86). A rotary motor (77) is fixedly mounted on the mounting base plate (76). The driving gear (87) is fixedly mounted on the output shaft of the rotary motor (77).

6. A self-centering clamp lifting device for a crane with a traveling wheel as described in claim 5, characterized in that: The inner clamping drive (83) includes a bidirectional lead screw (832) rotatably installed in the inner clamping groove (811). The outer periphery of the fixed support (81) is fixedly installed with an inner clamping motor (831) for driving the bidirectional lead screw (832) to rotate. The two ends of the bidirectional lead screw (832) are provided with threads with opposite helical directions. Two sets of lead screw slides (833) are threadedly connected to the bidirectional lead screw (832). Both sets of lead screw slides (833) are slidably connected in the inner clamping groove (811).

7. A self-centering clamp lifting device for a crane with a traveling wheel as described in claim 6, characterized in that: The lead screw slide (833) is provided with two sets of slide slots (834) parallel to the bidirectional lead screw (832). A U-shaped slide (821) is slidably connected through the slide slots (834). The two ends of the U-shaped slide (821) are fixedly connected to the inner clamping base plate (823). An electric telescopic rod (822) is fixedly installed on the side of the lead screw slide (833) away from the inner clamping base plate (823). The output end of the electric telescopic rod (822) is fixedly connected to the U-shaped slide (821), and the distance between the lead screw slide (833) and the surface of the fixed support (81) is not less than The height of the inner clamping adjustment seat (824) is adjusted so that the inner clamping adjustment seat (824) can be fully retracted into the inner clamping groove (811) under the action of the electric telescopic rod (822), so that the surface of the fixed support (81) is flat. When the side of the object does not have an inner hole, the inner clamping adjustment seat (824) is retracted into the inner clamping groove (811), and the end face of the fixed support (81) presses against the side wall of the object to achieve clamping. When the side of the object has an inner hole, the inner clamping adjustment seat (824) extends out of the surface of the fixed support (81) under the action of the electric telescopic rod (822) to clamp the inner hole of the object.

8. A self-centering clamp lifting device for a crane with a traveling wheel as described in claim 5, characterized in that: The external clamping mechanism (84) includes an external clamping support (841) fixedly connected to the end of the connecting bracket (88). An external clamping screw (843) is rotatably installed inside the external clamping support (841). An external clamping motor (842) for driving the external clamping screw (843) to rotate is fixedly installed on the outer wall of the external clamping support (841). A threaded slider (844) is threadedly connected to the external clamping screw (843). The threaded slider (844) is slidably connected to the external clamping support (841). A disassembly and assembly clamping seat (845) is detachably installed on the threaded slider (844). An external clamping plate (846) for clamping the outer periphery of an object is provided on the disassembly and assembly clamping seat (845). The external clamping plate (846) is provided with different specifications according to the outer periphery shape of the object.

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