Precast pile self-unhooking rotary lifting appliance

Abstract

The invention discloses a precast pile self-unhooking rotary lifting appliance, and relates to the field of constructional engineering lifting equipment.The precast pile self-unhooking rotary lifting appliance comprises a strip-shaped lifting appliance reference block and a U-shaped groove formed in the strip-shaped lifting appliance reference block, the opening direction of the U-shaped groove faces downwards, and a metal lifting hook is inserted into an opening in the bottom end of the U-shaped groove; the metal lifting hook is rotationally connected with the strip-shaped lifting tool reference block through a thickened metal connecting shaft, an unhooking lever plate is arranged at the top end of the metal lifting hook, when the metal lifting hook is in a lifting state, the unhooking lever plate is arranged in a state of inclining and extending towards the upper left side, and unhooking balancing weights are welded to the front end and the rear end of the top of the unhooking lever plate; the outsides of the two unhooking balancing weights are connected with an unhooking angle limiting controllable device, and the maximum unhooking rotation angle of the metal lifting hook can be precisely limited by changing the fixed position of an unhooking angle limiting stop lever in an arc-shaped rotation sliding groove; therefore, the problem of excessive rotation caused by uncontrollable gravity action in the traditional self-unhooking lifting appliance is avoided.

Description

Technical Field

[0001] This invention belongs to the technical field of hoisting equipment for construction engineering, and specifically relates to a self-unhooking rotating hoist for precast piles. Background Technology

[0002] The precast pile self-unhooking rotating hoist is a core piece of specialized equipment for hoisting precast piles in building foundation construction. By integrating automatic unhooking and 360° rotation functions, it replaces the traditional manual hooking, unhooking, and orientation operations, realizing fully automated operation of the entire process of precast pile lifting, transportation, alignment, and lowering. This greatly improves construction efficiency, reduces the safety risks of high-altitude operations, and is widely applicable to the hoisting and construction needs of concrete square piles and pipe piles in scenarios such as building construction, bridges, and municipal engineering. However, existing precast pile self-unhooking rotating lifting tools have fixed unhooking angles when unhooking, which cannot be flexibly adjusted according to the lifting point size and shape of different specifications of precast piles. This results in poor adaptability. Some lifting tools are prone to hook structure deformation and subsequent hooking difficulties due to excessive unhooking angles. This not only affects the continuity of lifting operations, but may also cause safety hazards such as collisions and falling off of precast piles. Summary of the Invention

[0003] The purpose of this invention is to provide a precast pile self-unhooking rotating lifting device to solve the problems mentioned in the background art, such as the fixed unhooking angle of existing precast pile self-unhooking rotating lifting devices, which are difficult to adapt to different specifications of precast pile lifting points, and the excessive angle can easily cause hook deformation, subsequent hooking difficulties, affect the continuity of operation, and may also cause safety hazards such as precast pile collision and falling off.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a precast pile self-unhooking rotating lifting device, comprising a strip-shaped lifting device reference block and a U-shaped groove formed therein, wherein the opening of the U-shaped groove faces downward, and a metal hook is inserted into the bottom opening of the U-shaped groove, and the metal hook is rotatably connected to the strip-shaped lifting device reference block through a thickened metal connecting shaft. The top of the metal hook is provided with a release lever plate, and when the metal hook is in the lifting state, the release lever plate is set in a state of tilting upward to the left, and release counterweights are welded to both the front and rear ends of the top of the release lever plate, and a release angle limiting control device is connected to the outside of the two release counterweights.

[0005] As a further improvement of the present invention, the unhooking angle limiting controllable device includes an arc-shaped metal guide A, a fixing ring and an arc-shaped metal guide B. The left ends of the arc-shaped metal guide A and the arc-shaped metal guide B are both welded with fixing rings. The two fixing rings are respectively sleeved on the outside of the two unhooking counterweights, and the arc-shaped metal guide A and the arc-shaped metal guide B are respectively located in front of and behind the strip-shaped lifting reference block.

[0006] As a further improvement of the present invention, the unhooking angle limiting controllable device also includes fixing screws and anti-deformation connecting blocks. Both fixing rings are fixedly connected to the unhooking counterweight block by multiple fixing screws. An anti-deformation connecting block is fixedly connected between the right ends of the arc-shaped metal guide A and the arc-shaped metal guide B, which can prevent the right ends of the arc-shaped metal guide A and the arc-shaped metal guide B from getting close to each other, so as to ensure that neither the arc-shaped metal guide A nor the arc-shaped metal guide B contacts the front and rear end outer walls of the strip-shaped lifting reference block.

[0007] As a further improvement of the present invention, the arc-shaped metal guide A and the arc-shaped metal guide B are arranged symmetrically front and back, and the center of their arcs coincides with the center of rotation of the metal hook. That is, when the metal hook and the release lever plate rotate clockwise and counterclockwise, the arc-shaped metal guide A and the arc-shaped metal guide B rotate synchronously.

[0008] As a further improvement of the present invention, the unhooking angle limiting controllable device further includes an arc-shaped rotating groove and an unhooking angle limiting stop bar. The arc-shaped metal guide bar A and the arc-shaped metal guide bar B are both provided with arc-shaped rotating grooves arranged along their arc direction. An unhooking angle limiting stop bar is provided between the arc-shaped metal guide bar A and the arc-shaped metal guide bar B. The front and rear ends of the unhooking angle limiting stop bar are respectively in contact with the arc-shaped metal guide bar A and the arc-shaped metal guide bar B, and the unhooking angle limiting stop bar can slide between the arc-shaped metal guide bar A and the arc-shaped metal guide bar B.

[0009] As a further improvement of the present invention, the unhooking angle limiting controllable device further includes a threaded slide head and a stop bar locking nut. The unhooking angle limiting stop bar is located on the right side of the strip-shaped lifting device reference block, and threaded slide heads are welded to both its front and rear ends. The two threaded slide heads respectively penetrate the arc-shaped rotating grooves inside the arc-shaped metal guide bar A and the arc-shaped metal guide bar B. The stop bar locking nuts are threadedly sleeved on the outside of the two threaded slide heads. After the stop bar locking nuts are tightened, they can be clamped at the front end of the arc-shaped metal guide bar A and the rear end of the arc-shaped metal guide bar B respectively by the unhooking angle limiting stop bar. This prevents the hook-off angle limiting stop from moving between the arc-shaped metal guide A and the arc-shaped metal guide B. By changing its fixed position between the arc-shaped metal guide A and the arc-shaped metal guide B, the hook-off angle limiting stop can limit the angle at which the hook-off lever plate drives the metal hook to rotate for hook-off. That is, when the hook-off lever plate rotates counterclockwise through the hook-off counterweight block to make the metal hook rotate for hook-off, the hook-off angle limiting stop prevents the hook-off lever plate from rotating further by blocking the right end of the strip-shaped lifting device reference block, thereby limiting the maximum rotation angle of the metal hook for hook-off.

[0010] As a further improvement of the present invention, a hook fixing shaft is vertically provided at the top center of the strip-shaped lifting reference block, and a rotating connecting seat is sleeved on its outside. The rotating connecting seat can rotate clockwise and counterclockwise outside the hook fixing shaft. A metal stop block is sleeved on the top of the hook fixing shaft, which blocks the top of the rotating connecting seat to prevent the rotating connecting seat from separating from the hook fixing shaft.

[0011] As a further improvement of the present invention, the metal block is fixedly connected to the hook fixing shaft by a plurality of embedded screws, and cable connecting rings are welded to the top of the left and right ends of the rotating connecting seat.

[0012] Compared with the prior art, the present invention provides a precast pile self-unhooking rotating lifting tool, which has the following beneficial effects: This invention achieves adjustable limit control of the rotation angle of the metal hook driven by the release lever plate by setting a release angle limiting control device on the outside of the release counterweight block and utilizing the relative position cooperation between the arc-shaped metal guide bar A, arc-shaped metal guide bar B and the release angle limiting stop bar. By changing the fixed position of the release angle limiting stop bar in the arc-shaped rotating groove, the maximum release rotation angle of the metal hook can be precisely limited, thereby avoiding the problem of excessive rotation caused by uncontrollable gravity in traditional self-release lifting devices. This significantly improves the safety and controllability of the precast pile lifting, positioning and unloading process, and is especially suitable for the lifting operation of precast piles of different specifications and different lifting point structures. Meanwhile, the arc-shaped metal guide bar A and the arc-shaped metal guide bar B are arranged symmetrically back and forth, with their arc center aligned with the rotation center of the metal hook. They are reinforced as a whole by anti-deformation connecting blocks, so that the hook angle limiting structure is subjected to balanced force during rotation and is not prone to deformation. This structurally ensures the long-term stability of the limiting accuracy. Combined with the locking method of the threaded slide and the stop rod locking nut, the hook angle can be quickly adjusted and reliably locked without the need for complicated tools. Furthermore, the unhooking angle limiting control device is arranged entirely on the outside of the strip-shaped lifting tool reference block, and does not rub against the front and rear end outer walls of the strip-shaped lifting tool reference block. It will not interfere with the normal unhooking action of the metal hook, nor will it affect the directional adjustment function of the rotating connecting seat on the overall direction of the lifting tool. This allows the lifting rotation, unhooking unloading and angle limiting to work independently and collaboratively, improving the stability and construction adaptability of the lifting operation, and meeting the invention's requirements for simple structure, safe use and on-site adaptability. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of a precast pile self-unhooking rotating lifting device in the lifting state according to the present invention.

[0014] Figure 2 This is a three-dimensional structural diagram of a precast pile self-unhooking rotating lifting device in the unhooking state according to the present invention.

[0015] Figure 3 This is a front-view three-dimensional structural diagram of the unhooking angle limiting controllable device of the present invention.

[0016] Figure 4This is a three-dimensional disassembly diagram of the unhooking angle limiting controllable device of the present invention.

[0017] Explanation of reference numerals in the attached figures: 1. Thickened metal connecting shaft; 2. Strip-shaped lifting device reference block; 3. Unhooking lever plate; 4. Unhooking counterweight block; 5. Rotary connecting seat; 6. Cable connecting ring; 7. Metal stop block; 8. Hook fixing shaft; 9. Unhooking angle limiting controllable device; 10. U-shaped groove; 11. Metal hook; 12. Arc-shaped metal guide bar A; 13. Threaded slide head; 14. Arc-shaped rotating slide groove; 15. Fixing ring; 16. Fixing screw; 17. Arc-shaped metal guide bar B; 18. Stop bar locking nut; 19. Unhooking angle limiting stop bar; 20. Anti-deformation connecting block. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] This invention provides, for example Figure 1-4 The diagram shows a precast pile self-unhooking rotating lifting device. The strip-shaped lifting device reference block 2 is the core load-bearing body of the precast pile self-unhooking rotating lifting device. A U-shaped groove 10 is opened along the length direction inside the groove 2. The opening of the U-shaped groove 10 faces downward, which is used to provide clearance space for the installation, swinging and unhooking rotation of the metal hook 11. The metal hook 11 is inserted into the bottom opening of the U-shaped groove 10. The metal hook 11 is rotatably connected to the strip-shaped lifting device reference block 2 through a thickened metal connecting shaft 1. The thickened metal connecting shaft 1 is made of high-strength metal material, which can provide a stable rotation fulcrum while ensuring the load-bearing strength. This ensures that after the metal hook 11 applies radial load and impact load to the thickened metal connecting shaft 1 during the lifting and lowering of the precast pile, the metal hook 11 can still rotate smoothly around the thickened metal connecting shaft 1 as the rotation center during the unhooking process.

[0020] like Figure 1 and Figure 2As shown, a hook fixing shaft 8 is vertically installed at the top center of the strip-shaped lifting reference block 2. A rotating connecting seat 5 is sleeved on the outside of the hook fixing shaft 8. The rotating connecting seat 5 can rotate clockwise or counterclockwise around the hook fixing shaft 8, so that the entire lifting device has the ability to automatically adjust direction during the lifting process, avoiding torsional stress caused by the precast pile due to the limited lifting angle. A metal stop 7 is sleeved on the top of the hook fixing shaft 8. The metal stop 7 is fixedly connected to the hook fixing shaft 8 by multiple embedded screws. The metal stop 7 is located above the rotating connecting seat 5 and is used to limit the axial displacement of the rotating connecting seat 5 to prevent it from detaching during lifting or rotation, further improving the stability and safety of the overall structure of the lifting device. Cable connecting rings 6 are symmetrically welded to the top of the left and right ends of the rotating connecting seat 5 for connecting with the cable or hook of the lifting equipment, so that the lifting load is evenly transmitted to the strip-shaped lifting reference block 2.

[0021] like Figure 1 and Figure 2 As shown, a release lever plate 3 is integrally provided at the top of the metal hook 11. When the metal hook 11 is in the normal lifting state, the release lever plate 3 is inclined to the upper left relative to the strip-shaped lifting reference block 2. This structure makes the release lever plate 3 in a force-balanced position during the lifting state, creating conditions for subsequent automatic release by gravity. Release counterweights 4 are welded to both the front and rear ends of the top of the release lever plate 3. The release counterweights 4 increase the mass of the side of the release lever plate 3 away from the rotation axis, forming a significant torque change when the metal hook 11 loses its tension constraint. When the precast pile is lowered to the designated position and the tension on the metal hook 11 gradually decreases until it disappears, the release counterweights 4 drive the release lever plate 3 to rotate counterclockwise around the thickened metal connecting shaft 1 under the action of gravity, thereby driving the metal hook 11 to rotate synchronously, realizing the automatic release of the precast pile without manual intervention, reducing the risk of high-altitude unhooking operations.

[0022] like Figure 1 , Figure 3 and Figure 4As shown, to overcome the problems of the non-adjustable hooking angle and poor adaptability of traditional gravity-type self-unhooking lifting devices, hooking angle limiting and controllable devices 9 are respectively installed on the outside of the two hooking counterweights 4. These devices are used to limit and adjust the maximum rotation angle of the metal hook 11 during the hooking process. The hooking angle limiting and controllable device 9 includes an arc-shaped metal guide bar A12, a fixing ring 15, an arc-shaped metal guide bar B17, a fixing screw 16, an anti-deformation connecting block 20, an arc-shaped rotating slide 14, a hooking angle limiting stop bar 19, a threaded slide bar 13, and a stop bar locking nut 18. The left ends of the arc-shaped metal guide bar A12 and the arc-shaped metal guide bar B17 are each welded with a fixing ring 15. The two fixing rings 15 are respectively sleeved on the outside of the corresponding hooking counterweights 4 and are fixedly connected by multiple fixing screws 16, so that the arc-shaped metal guide bar A12 and the arc-shaped metal guide bar B17 can rotate synchronously with the hooking counterweights 4 and the hooking lever plate 3.

[0023] like Figure 1 , Figure 3 and Figure 4 As shown, arc-shaped metal guide bars A12 and B17 are respectively arranged on the front and rear sides of the strip-shaped lifting device reference block 2, and are symmetrically arranged. The center of their arcs coincides with the rotation center of the metal hook 11, structurally ensuring that the relative distance between the arc-shaped metal guide bars A12 and B17 and the rotation center of the metal hook 11 remains consistent during the unhooking rotation process. An anti-deformation connecting block 20 is fixedly connected between the right ends of the arc-shaped metal guide bars A12 and B17. This block restricts the two arc-shaped metal guide bars from approaching each other or warping under stress, thereby maintaining the geometric stability of the entire limiting structure and ensuring that the arc-shaped metal guide bars A12 and B17 maintain a gap with the strip-shaped lifting device reference block 2 during rotation, preventing frictional contact.

[0024] like Figure 1 , Figure 3 and Figure 4 As shown, both the arc-shaped metal guide A12 and the arc-shaped metal guide B17 have arc-shaped rotating grooves 14 along their arc direction inside. A hook-off angle limiting stop 19 is provided between the two arc-shaped rotating grooves 14. The hook-off angle limiting stop 19 is located on the right side of the strip-shaped lifting device reference block 2, and its front and rear ends are respectively attached to the arc-shaped metal guide A12 and the arc-shaped metal guide B17. Threaded slide heads 13 are welded to both the front and rear ends of the hook-off angle limiting stop 19. The two threaded slide heads 13 pass through the corresponding arc-shaped rotating grooves 14, and their external threads are fitted with stop nut locking nuts 18. By tightening the stop nut locking nuts 18, the hook-off angle limiting stop 19 can be reliably locked in any preset position of the arc-shaped rotating groove 14. By loosening the stop nut locking nuts 18, the hook-off angle limiting stop 19 can slide along the arc-shaped rotating groove 14, thereby changing its limiting position.

[0025] In the above configuration, the trajectory of the arc-shaped rotating slide 14 is consistent with the rotation trajectory of the metal hook 11, so that the position of the unhooking angle limiting stop 19 in the arc-shaped rotating slide 14 directly corresponds to the maximum rotation stroke of the unhooking lever plate 3. When adjusting the unhooking angle limiting stop 19, it is easy to determine the maximum rotation angle of the metal hook 11. At the same time, it can ensure that no matter what position the unhooking angle limiting stop 19 is adjusted to, it can always make limiting contact with the same position on the right end of the strip-shaped lifting reference block 2, preventing the arc-shaped metal guide bar from interfering with other components or the angle limiting stop 19 from failing to contact the strip-shaped lifting reference block 2 during rotation.

[0026] like Figure 1 , Figure 3 and Figure 4 As shown, since the trajectory of the arc-shaped rotating chute 14 is consistent with the rotation trajectory of the metal hook 11, the position of the disengagement angle limiting stop 19 in the arc-shaped rotating chute 14 directly corresponds to the maximum rotation stroke of the disengagement lever plate 3. When the precast pile is lowered and the disengagement counterweight 4 drives the disengagement lever plate 3 to rotate counterclockwise, the arc-shaped metal guide bar A12 and the arc-shaped metal guide bar B17 rotate synchronously. When the disengagement angle reaches the set value, as... Figure 2 As shown, the unhooking angle limiting stop 19 makes limiting contact with the right end of the strip-shaped lifting reference block 2, preventing the unhooking lever plate 3 from continuing to rotate, thereby precisely limiting the unhooking rotation angle of the metal hook 11. This structure can prevent the metal hook 11 from being subjected to abnormal stress due to an excessively large unhooking angle or affecting subsequent rehooping, and can also avoid incomplete unhooking due to an insufficient unhooking angle, thus ensuring the safety and reliability of the precast pile hoisting and unloading process.

[0027] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A precast pile self-unhooking rotating lifting device, comprising a strip-shaped lifting device reference block (2) and a U-shaped groove (10) formed therein, wherein the opening of the U-shaped groove (10) faces downward, and a metal hook (11) is inserted into the bottom opening of the U-shaped groove (10), and the metal hook (11) is rotatably connected to the strip-shaped lifting device reference block (2) through a thickened metal connecting shaft (1), characterized in that: The metal hook (11) is provided with a release lever plate (3) at the top. When the metal hook (11) is in the hoisting state, the release lever plate (3) is set in a state of tilting upward to the left. The release lever plate (3) is welded with release counterweights (4) at both the front and rear ends. The two release counterweights (4) are connected to a release angle limiting control device (9). The unhooking angle limiting controllable device (9) includes an arc-shaped metal guide bar A (12), a fixing ring (15) and an arc-shaped metal guide bar B (17). The left ends of the arc-shaped metal guide bar A (12) and the arc-shaped metal guide bar B (17) are both welded with fixing rings (15). The two fixing rings (15) are respectively fitted on the outside of the two unhooking counterweights (4), and the arc-shaped metal guide bar A (12) and the arc-shaped metal guide bar B (17) are respectively located in front of and behind the strip-shaped lifting reference block (2).

2. The precast pile self-unhooking rotating lifting device according to claim 1, characterized in that: The unhooking angle limiting controllable device (9) also includes fixing screws (16) and anti-deformation connecting block (20). Both fixing rings (15) are fixedly connected to the unhooking counterweight block (4) by multiple fixing screws (16). An anti-deformation connecting block (20) is fixedly connected between the right ends of the arc-shaped metal guide A (12) and the arc-shaped metal guide B (17), which can prevent the right ends of the arc-shaped metal guide A (12) and the arc-shaped metal guide B (17) from getting close to each other, so as to ensure that neither the arc-shaped metal guide A (12) nor the arc-shaped metal guide B (17) contacts the front and rear end outer walls of the strip-shaped lifting reference block (2).

3. The precast pile self-unhooking rotating lifting device according to claim 2, characterized in that: The arc-shaped metal guide bar A (12) and the arc-shaped metal guide bar B (17) are arranged symmetrically front and back, and the center of their arcs coincides with the center of rotation of the metal hook (11).

4. The precast pile self-unhooking rotating lifting device according to claim 3, characterized in that: The unhooking angle limiting controllable device (9) further includes an arc-shaped rotating slide groove (14) and an unhooking angle limiting stop bar (19). The arc-shaped metal guide bar A (12) and the arc-shaped metal guide bar B (17) are both provided with an arc-shaped rotating slide groove (14) arranged along their arc direction. An unhooking angle limiting stop bar (19) is provided between the arc-shaped metal guide bar A (12) and the arc-shaped metal guide bar B (17). The front and rear ends of the unhooking angle limiting stop bar (19) are respectively in contact with the arc-shaped metal guide bar A (12) and the arc-shaped metal guide bar B (17). The unhooking angle limiting stop bar (19) can slide between the arc-shaped metal guide bar A (12) and the arc-shaped metal guide bar B (17).

5. The precast pile self-unhooking rotating lifting device according to claim 4, characterized in that: The unhooking angle limiting controllable device (9) also includes a threaded slide (13) and a stop bar locking nut (18). The unhooking angle limiting stop bar (19) is located on the right side of the strip-shaped lifting tool reference block (2). Threaded slides (13) are welded to both its front and rear ends. The two threaded slides (13) pass through the arc-shaped rotating grooves (14) inside the arc-shaped metal guide bar A (12) and the arc-shaped metal guide bar B (17), respectively. Stop bar locking nuts (18) are threaded onto the outside of both threaded slides (13). After the stop bar locking nuts (18) are tightened, they can be clamped at the front end of the arc-shaped metal guide bar A (12) and the rear end of the arc-shaped metal guide bar B (17) respectively through the unhooking angle limiting stop bar (19) to prevent... The angle limiting stop (19) for disengagement moves between the arc-shaped metal guide bar A (12) and the arc-shaped metal guide bar B (17). The angle limiting stop (19) for disengagement can limit the angle at which the disengagement lever plate (3) drives the metal hook (11) to disengage by changing the fixed position between the arc-shaped metal guide bar A (12) and the arc-shaped metal guide bar B (17). That is, when the disengagement lever plate (3) rotates counterclockwise through the disengagement counterweight block (4) to make the metal hook (11) rotate and disengage, the angle limiting stop (19) for disengagement prevents the disengagement lever plate (3) from rotating further by blocking the right end of the strip-shaped lifting reference block (2), so as to limit the maximum rotation angle of the metal hook (11) for disengagement.

6. The precast pile self-unhooking rotating lifting device according to claim 1, characterized in that: The top center of the strip-shaped lifting reference block (2) is provided with a hook fixing shaft (8), and a rotating connecting seat (5) is sleeved on its outside. The rotating connecting seat (5) can rotate clockwise and counterclockwise outside the hook fixing shaft (8). A metal stop block (7) is sleeved on the top of the hook fixing shaft (8), which blocks the top of the rotating connecting seat (5) to prevent the rotating connecting seat (5) from separating from the hook fixing shaft (8).

7. The precast pile self-unhooking rotating lifting device according to claim 7, characterized in that: The metal block (7) is fixedly connected to the hook fixing shaft (8) by multiple embedded screws, and the top of the left and right ends of the rotating connecting seat (5) is welded with cable connecting rings (6).

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