Steel construction holder

Abstract

The utility model discloses a kind of steel structure clamps, belong to heavy component hoisting equipment technical field.The clamp includes girder, and its both ends are fixedly connected mounting plate;Lifting lug is fixed on the upper end of girder;Connecting rod is rotatably connected in the lower part of mounting plate by pin shaft;Clamping claw is rotatably connected with connecting rod by pin shaft;Connecting plate is rotatably connected with clamping claw by fixed shaft;Middle plate is slidably sleeved on fixed shaft;Rear plate is fixed in the lower end of girder middle part;Front plate is fixedly connected in the lower end of rear plate and forms stepped limiting structure.By adjusting the spacing of two middle plates, the front plate, rear plate or girder selectively contacts the middle plate, achieving the step control of clamping claw small, medium and large three kinds of opening degree.The utility model uses pure mechanical type adjusting mechanism, without tool disassembly during operation, and the clamping range can be quickly switched, combined with the design of damping vibration resistance to ensure that hoisting process parameter is stable, solve the problem of low efficiency of traditional clamp adjustment, especially suitable for the batch hoisting operation of special-shaped cross-section component.

Description

Technical Field

[0001] This utility model belongs to the technical field of steel structure construction equipment, specifically relating to a heavy component hoisting equipment used in construction, bridge and other engineering projects, and in particular a steel structure clamp. This clamp, through an innovative mechanical adjustment mechanism, achieves intelligent graded control of the clamping opening, mainly solving the problem of low adjustment efficiency of traditional clamps when hoisting steel structures of different sizes. Background Technology

[0002] In modern steel structure projects such as large stadiums and bridges, efficient and safe component hoisting is a critical aspect of construction. Traditional clamps generally employ bolt-positioned opening adjustment mechanisms, requiring operators to repeatedly disassemble fasteners, manually move components, and re-lock them to adjust the clamping range. This method suffers from significant efficiency drawbacks—each adjustment process is time-consuming, severely hindering construction progress. With the widespread adoption of modular building technologies, the need for batch hoisting of components with different cross-sectional dimensions has become a bottleneck in engineering projects. Especially when frequent switching of hoisting specifications for irregularly shaped components such as H-beams and box girders is required on construction sites, traditional technologies struggle to meet the demands of efficient and continuous industrial operations.

[0003] Current grippers have room for improvement in their structural design. The spatial overlap between the gripper linkage mechanism and the main load-bearing beam causes mechanical interference during the opening and closing process, which can easily lead to component deformation or even structural failure over long-term operation. The design of requiring complete replacement of the gripper claws after the gripping surface wears out further increases maintenance costs. In particular, traditional devices lack physical constraints on the maximum gripping opening, which dramatically increases the risk of falls from heights. This hazard is especially prominent in the operation of non-standard components such as variable cross-section columns and diagonal braces.

[0004] As heavy steel structures evolve towards large-scale, high-paced construction, the industry urgently needs to overcome three core pain points: In terms of operational efficiency, the tool-free disassembly method must be completely eliminated, enabling rapid tool-less switching of opening angles; in terms of safety performance, the mechanism must possess self-adaptive constraint capabilities to fundamentally prevent positioning failures; and in terms of full-cycle cost management, key wear parts must support independent replacement. While existing bolt positioning solutions are structurally simple, their efficiency bottlenecks are becoming increasingly apparent in industrial settings. Therefore, the market urgently needs a mechanical clamp that, through innovative mechanism design, simultaneously achieves precise opening grading, zero motion interference, and vibration and displacement resistance, thereby improving overall construction efficiency while ensuring inherent safety. Summary of the Invention

[0005] The purpose of this invention is to provide a steel structure clamp to solve the problem of low adjustment efficiency of existing traditional clamps when hoisting steel structures of different sizes.

[0006] To address the aforementioned problems, this utility model provides a steel structure clamp, comprising:

[0007] The main beam has mounting plates fixedly connected to both ends;

[0008] The lifting lugs are fixedly connected to the upper end of the main beam;

[0009] The connecting rod is rotatably connected to the lower part of the mounting plate via a pin.

[0010] The clamping claw is rotatably connected to the connecting rod via a pin.

[0011] The connecting plate is rotatably connected to the clamping claw via a fixed shaft;

[0012] The intermediate plate is slidably fitted onto the fixed shaft;

[0013] The rear plate is fixed to the lower middle part of the main beam;

[0014] The front plate is fixedly connected to the lower end of the rear plate.

[0015] Furthermore, the lower end of the mounting plate is provided with a hole for the pin to pass through, and the connecting rod forms a rotating pair with the mounting plate through the pin.

[0016] Furthermore, the rear plate and the front plate form a stepped limiting structure.

[0017] Furthermore, the connecting plate includes symmetrically arranged inner and outer plates that are connected to each other by pins.

[0018] Furthermore, the clamping part of the clamping claw is fixed with a plate with a serrated surface.

[0019] Furthermore, the insert is detachably fixed to the clamping portion of the clamping claw by bolts.

[0020] Furthermore, the spacing between the two intermediate plates is adjustable.

[0021] Furthermore, the projected area of ​​the front panel is smaller than the projected area of ​​the rear panel.

[0022] Furthermore, a reinforcing rib is provided between the lifting lug and the main beam, and the lifting lug is provided with a hole for the lifting bolt to pass through.

[0023] Furthermore, a damping structure is provided within the through-hole of the intermediate plate.

[0024] This utility model has the following beneficial effects:

[0025] (1) This utility model achieves graded control of the clamping opening through the synergistic effect of a stepped limiting structure and a sliding adjustment mechanism. The stepped limiter consists of two contact planes formed by front and rear plates with a height difference design. Combined with the adjustable spacing of the sliding middle plate, the three clamping opening modes can be accurately switched by simply adjusting the spacing between the two middle plates. This mechanical adjustment mechanism eliminates the traditional bolt positioning method, and the operation process does not require disassembly of any parts, which greatly shortens the hoisting conversion time of steel components of different specifications. At the same time, the stepped limiting structure effectively constrains the maximum opening of the clamping claw, fundamentally avoiding the positioning failure problem caused by excessive opening, and significantly improving the gripping reliability of irregular cross-section components. In practical applications, this design can quickly respond to the hoisting needs of steel structures of various sizes and shows excellent adaptability in complex construction site environments.

[0026] (2) The layout of the connecting rod outside the main beam completely eliminates the risk of interference between the movement trajectory of the clamping claw and the main beam, ensuring smooth and unobstructed opening and closing. The polymer damping ring built into the intermediate plate suppresses unexpected displacement caused by equipment vibration through continuous static friction, so that the adjusted opening parameters remain stable during hoisting. The modular panel design supports quick replacement of the clamping panel according to the working conditions.

[0027] (3) The linkage structure and clamping mechanism of this utility model efficiently convert the vertical lifting force into radial clamping force. During the hoisting process, only a single lifting action is needed to complete the entire process of grabbing and locking, reducing the number of operation steps compared to traditional clamps. The detachable panel design and tool-less adjustment mode significantly reduce maintenance costs. Users can replace the serrated panel individually according to the wear condition, avoiding the scrapping of the entire equipment. The physical stop structure of the stepped limiter eliminates common failures. These characteristics make it particularly suitable for batch hoisting scenarios of heavy steel structures, improving work efficiency while extending the service life of the equipment. Attached Figure Description

[0028] Figure 1 This is an isometric view of the steel structure clamp of this utility model embodiment;

[0029] Figure 2 This is a front view of the steel structure clamp according to an embodiment of the present utility model;

[0030] Figure 3 This is a top view of the steel structure clamp of this utility model embodiment;

[0031] Figure 4 This is a side view of the steel structure clamp according to an embodiment of the present utility model;

[0032] Figure 5 This is a cross-sectional view of the steel structure clamp according to an embodiment of the present utility model;

[0033] Figure 6This is a structural diagram of the steel structure clamp according to an embodiment of the present utility model.

[0034] Explanation of reference numerals in the attached drawings: 1-Connecting plate; 2-Clamping claw; 3-Connecting rod; 4-Mounting plate; 5-Main beam; 6-Lifting lug; 7-Lifting bolt; 8-Front plate; 9-Fixed shaft; 10-Intermediate plate; 11-Installation plate; 12-Rear plate. Detailed Implementation

[0035] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0036] To fully understand this utility model, detailed steps and structures will be presented in the following description to illustrate the technical solution of this utility model. Preferred embodiments of this utility model are described in detail below; however, in addition to these detailed descriptions, this utility model may have other embodiments.

[0037] like Figures 1 to 6 In one embodiment of the steel structure clamp of this utility model, the clamp achieves dynamic adjustment of the clamping range through the synergistic effect of mechanical linkage and sliding limit mechanism. The structural relationship and functional implementation of each component are as follows:

[0038] The main beam 5 serves as the core load-bearing component, with mounting plates 4 fixed at both ends. Through holes are provided at the bottom of the mounting plates 4 for pin installation. A lifting lug 6 is fixed at the center of the upper end face of the main beam 5. A through hole is provided at the top of the lifting lug 6 for the lifting bolt 7 to pass through, so that the lifting force of the crane is accurately transmitted along the longitudinal centerline of the main beam 5.

[0039] In one embodiment, a reinforcing rib is provided at the joint area between the lifting lug 6 and the main beam 5, which significantly improves fatigue resistance by expanding the stress distribution area.

[0040] Link 3 is rotatably connected to the lower part of mounting plate 4 via a pin, and clamping claw 2 is rotatably connected to link 3 via a pin. Link 3 and clamping claw 2 are symmetrically arranged on both sides of the lower end of mounting plate 4, forming a horizontal clamping arm and a vertical transmission arm. Link 3 is a rectangular cross-section rod, and its inner end is rotatably connected to a pre-drilled hole at the lower part of mounting plate 4 via a pin, forming the first rotating pair.

[0041] A through hole is opened at the upper end of the vertical transmission arm of the clamping claw 2, and a second rotating joint is formed with the outer end of the connecting rod 3 through a pin. The first and second rotating joints enable the clamping claw 2 to perform a fan-shaped opening and closing motion around the lower edge axis of the mounting plate 4, while the connecting rod 3 avoids spatial interference with the main beam 5 by being externally mounted through the mounting plate 4.

[0042] In one embodiment, the clamping arm of the clamping claw 2 is detachably mounted with a plate 11 by high-strength bolts. The working surface of the plate 11 is machined with a continuous and staggered serrated pattern to form a serrated surface, which effectively resists the slippage of the steel structure during the hoisting process by increasing the surface friction coefficient.

[0043] The connecting plate 1 is located inside the clamping jaw 2 and is a rigid frame formed by two sets of parallel inner and outer plates connected by a transverse pin. The upper end of the connecting plate 1 is rotatably connected to the through hole in the middle of the clamping jaw 2 via a fixed shaft 9, forming a third rotating pair. Two independently sliding intermediate plates 10 are fitted on the fixed shaft 9.

[0044] In one embodiment, a damping ring made of polymer material is embedded in the inner wall of the central through hole of the intermediate plate 10 to suppress unexpected displacement caused by equipment vibration through continuous static friction.

[0045] The rear plate 12 is fixed to the lower end face of the middle part of the main beam 5, and its plate surface projection is rectangular; the front plate 8 is fixed to the lower end of the rear plate 12, and its projected area is smaller than that of the rear plate 12. The two together form a stepped limiting structure. The step height difference between the rear plate 12 and the front plate 8 forms two contact planes with different heights, and the clamping opening is controlled in stages by selectively contacting the intermediate plate 10.

[0046] Before the main beam 5 is lowered, the spacing of the intermediate plates 10 is configured according to the size of the steel structure being clamped. When the crane moves the lifting lugs 6 through the lifting bolts 7 to lower the clamp as a whole, the connecting rod 3 rotates clockwise around the pin of the mounting plate 4, and the clamping claws 2 unfold outward. The insert plates 11 of the clamping part of the clamping claws 2 are located on both sides of the steel structure, and the insert plates 11 form a gap with the side wall of the steel structure to be lifted. Then the crane lifts the main beam 5, and the mounting plate 4 pulls the upper end of the clamping claws 2 inward through the connecting rod 3. The rotating joint of the connecting rod 3 and the mounting plate 4 converts the vertical lifting force into the radial clamping force until the serrated surface of the insert plate 11 presses tightly against the side wall of the steel structure to form a self-locking grip.

[0047] The opening angle of the clamping claw 2 is adjusted by changing the relative distance between the two intermediate plates 10: When the minimum clamping opening is required, the distance between the two intermediate plates 10 is adjusted to the minimum critical value. At this time, during the downward movement of the main beam 5, the front plate 8 contacts the intermediate plate 10 first. Due to the higher limiting height of the front plate 8, the opening angle of the clamping claw 2 is limited to a small range. When a medium clamping opening is required, the distance between the intermediate plates 10 is increased so that its total width is greater than the length of the front plate 8 but less than the length of the rear plate 12. When the main beam 5 moves downward, the rear plate 12 contacts the intermediate plate 10. The lower limiting height of the rear plate 12 allows the clamping claw 2 to open at a larger angle. When the maximum clamping opening is required, the distance between the intermediate plates 10 is further increased so that it exceeds the length of the rear plate 12. When the main beam 5 moves to its limit position, its lower end face directly contacts the upper surface of the intermediate plate 10. At this time, the opening angle of the clamping claw 2 reaches the maximum value allowed by the design. Switching between modes only requires adjusting the distance between the intermediate plates 10, without disassembling any parts.

[0048] The core advantages of this invention are firstly reflected in the design of the connecting rod 3 being externally positioned under the main beam 5 via the mounting plate 4, ensuring that the opening and closing trajectory of the clamping claw 2 completely avoids the space of the main beam 5, thus eliminating the risk of motion interference. Secondly, the stepped limiting structure formed by the rear plate 12 and the front plate 8, combined with the sliding characteristics of the intermediate plate 10, allows for rapid switching between three opening modes simply by adjusting the distance between the two plates, significantly improving operational efficiency compared to traditional bolt positioning methods. Furthermore, the damping ring within the through hole of the intermediate plate 10 creates continuous frictional resistance, ensuring the adjusted distance remains stable in the vibration environment of hoisting. Finally, the modular design of the insert plate 11 supports the rapid replacement of clamping panels with different tooth profiles according to working conditions. Practical application shows that this structural design can adapt to the rapid conversion and hoisting of steel components of various cross-sectional sizes, significantly reducing manual adjustment time and operational safety risks. Simultaneously, the stepped limiting mechanism effectively prevents positioning failure caused by excessive opening of the clamping claw 2.

[0049] The preferred embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, nor is it limited to steel structure clamps. Devices and structures not described in detail herein should be understood as being implemented in a manner common to the art. Any person skilled in the art can make many possible variations and modifications to the technical solution of this utility model, or modify it into equivalent embodiments, without departing from the scope of the technical solution of this utility model. This does not affect the essential content of this utility model. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model, without departing from the content of the technical solution of this utility model, still fall within the protection scope of the technical solution of this utility model.

Claims

1. A steel structure clamp, characterized in that, include: The main beam (5) has mounting plates (4) fixedly connected to both ends; The lifting lug (6) is fixedly connected to the upper end of the main beam (5); The connecting rod (3) is rotatably connected to the lower part of the mounting plate (4) via a pin; The clamping claw (2) is rotatably connected to the connecting rod (3) via a pin; The connecting plate (1) is rotatably connected to the clamping claw (2) via a fixed shaft (9); The intermediate plate (10) is slidably sleeved on the fixed shaft (9); The rear plate (12) is fixed to the lower middle part of the main beam (5); The front plate (8) is fixedly connected to the lower end of the rear plate (12).

2. The steel structure clamp according to claim 1, characterized in that: The mounting plate (4) has a hole at its lower end for the pin to pass through, and the connecting rod (3) forms a rotating pair with the mounting plate (4) through the pin.

3. The steel structure clamp according to claim 1, characterized in that: The rear plate (12) and the front plate (8) form a stepped limiting structure.

4. The steel structure clamp according to claim 1, characterized in that: The connecting plate (1) includes symmetrically arranged inner and outer plates that are connected to each other by pins.

5. The steel structure clamp according to claim 1, characterized in that: The clamping part of the clamping claw (2) is fixed with a serrated plate (11).

6. The steel structure clamp according to claim 5, characterized in that: The insert (11) is detachably fixed to the clamping part of the clamping claw (2) by bolts.

7. The steel structure clamp according to claim 1, characterized in that: The spacing between the two intermediate plates (10) is adjustable.

8. The steel structure clamp according to claim 3, characterized in that: The projected area of ​​the front plate (8) is smaller than the projected area of ​​the rear plate (12).

9. The steel structure clamp according to claim 1, characterized in that: A reinforcing rib is provided between the lifting lug (6) and the main beam (5), and a hole is provided on the lifting lug (6) for the lifting bolt (7) to pass through.

10. The steel structure clamp according to claim 7, characterized in that: The intermediate plate (10) has a damping structure inside the through hole.

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