Lifting appliance for lifting prefabricated square block

Abstract

The utility model relates to a lifting appliance for lifting a prefabricated square block, which belongs to the technical field of lifting appliances and comprises a lifting rod, a connecting rod, a rotating block, a traction piece and an elastic piece, wherein at least one lifting rod is arranged, the top of the lifting rod is used for being connected with a first lifting hook, and the lower portion of the lifting rod is used for stretching into a lifting hole in a prefabricated square block to lift the prefabricated square block; the connecting rods are mounted between the adjacent hanging rods; a through hole is formed in the lower portion of the suspender, and the rotating block is installed in the through hole and rotatably connected with the suspender. The rotating block is clamped in the lifting hole to lift the prefabricated square block; the traction piece is arranged in the lifting rod and used for pulling the rotating block to be folded; the elastic piece is elastically connected with the rotating block and used for releasing elastic force to enable the rotating block to restore to the open state. According to the lifting appliance, through the arrangement of the rotating block, the traction piece and the elastic piece, it can be ensured that the prefabricated square block can be lifted more rapidly, operation such as lifting, positioning and mounting of the prefabricated square block can be completed rapidly, and the lifting efficiency of the prefabricated square block is greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of lifting equipment technology, and in particular relates to a lifting equipment for lifting prefabricated blocks. Background Technology

[0002] Gravity block piers or dikes are walls formed by a certain number of precast solid or hollow concrete blocks constructed using a specific masonry method. During the construction of gravity piers, the precast blocks need to be accurately placed in designated locations to ensure the structural stability and durability of the pier; therefore, the hoisting of the precast blocks is crucial.

[0003] Currently, the traditional process for hoisting precast blocks involves using a floating crane vessel connected to a hoisting device to lift, position, install, and adjust the blocks. The automatic unhooking technology of the hoisting device greatly assists in the hoisting process.

[0004] In the prior art, Chinese invention patent application CN112173969A proposes a hydraulic self-balancing lifting system and its working method for large components. This system lifts large components using lifting rings at the bottom of the lifting frame, monitors the position and attitude parameters of the large component using wireless tilt sensors mounted on the lifting frame and on the bottom surface of the large component, and adjusts the attitude of the large component using hydraulic cylinders. While this patent can accurately lift large components to a preset position, its complex structure and cumbersome operation result in low lifting efficiency and make it unsuitable for lifting prefabricated blocks in engineering projects.

[0005] Therefore, how to provide hoisting equipment for lifting precast blocks is a technical problem that urgently needs to be solved. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides a lifting device for hoisting precast blocks. By setting a rotating block at the lower part of the lifting rod, the lifting rod can be firmly locked into the lifting hole of the precast block, ensuring that the precast block can be lifted more quickly and without shifting during hoisting and placement. At the same time, through the setting of traction components and elastic components, the rotating block can be quickly switched between the open and retracted states, thereby enabling the lifting, positioning and installation of precast blocks to be completed quickly, greatly improving the hoisting efficiency of precast blocks.

[0007] This utility model provides a lifting device for hoisting precast blocks, comprising:

[0008] A lifting rod is provided, at least one lifting rod is provided, the top of the lifting rod is used to connect the first lifting hook, and the lower part of the lifting rod is used to extend into the lifting hole inside the precast block to lift the precast block;

[0009] A connecting rod is installed between adjacent booms to connect them.

[0010] The rotating block has a through hole at the bottom of the lifting rod. The rotating block is installed in the through hole and is rotatably connected to the lifting rod. The rotating block has an open state and a retracted state. When the rotating block is in the retracted state, the lifting rod can extend into the lifting hole. When the rotating block is in the open state, the rotating block is locked in the lifting hole to lift the precast block.

[0011] The traction component is hollow inside the boom. One end of the traction component is connected to the second lifting hook, and the other end is connected to the rotating block. It is used to pull the rotating block to retract.

[0012] An elastic element is also provided in the through hole at the lower part of the rod. The elastic element is elastically connected to the rotating block and is used to release the elastic force so that the rotating block returns to the open state. When the rotating block is in the retracted state, the elastic element is in the stretched state; when the rotating block is in the open state, the elastic element is in the contracted state.

[0013] This technical solution incorporates a rotating block at the bottom of the lifting rod, allowing the rod to be securely engaged within the lifting holes of the precast block. This ensures the precast block can be lifted more quickly and without shifting during lifting and placement. Furthermore, the use of traction and elastic components enables rapid switching between the open and retracted states of the rotating block, facilitating quick lifting, positioning, and installation of the precast block and significantly improving lifting efficiency.

[0014] In some embodiments, a limiting rod is provided inside the through hole to limit the rotation angle of the rotating block when it is retracted. This technical solution, through the setting of the limiting rod, ensures that the rotating block accurately reaches the preset retraction angle.

[0015] In some embodiments, the elastic element is a tension spring, with one end fixed to the bottom of the through hole and the other end connected to the rotating block. In this technical solution, when the traction element is released, the tension spring can quickly and stably release the stored elastic potential energy, allowing the rotating block to quickly and accurately return to the open state.

[0016] In some embodiments, fasteners for securing the tension spring are installed at the bottom of the through-hole and on the rotating block. This technical solution improves the overall stability of the lifting device and effectively avoids abnormal switching of the rotating block state due to unstable tension spring fixing.

[0017] In some embodiments, the elastic element is a torsion spring, with the helical portion of the torsion spring wound around the limiting rod, and the torsion arm of the torsion spring contacting the rotating block. In this technical solution, when the traction element is released, the torsion spring quickly releases its stored energy, using a stable and precise torque to push the rotating block back to the open state quickly.

[0018] In some embodiments, a fixing shaft is provided inside the through hole for fixing the rotating block, and the rotating block is rotatably connected to the fixing shaft. The fixing shaft in this technical solution provides a stable and reliable structural foundation for the installation and rotation of the rotating block, while defining the rotation path and position of the rotating block.

[0019] In some embodiments, the traction component includes a traction rope, an opening at the top of the boom, and a rope-passing hole on the rotating block for threading the traction rope. One end of the traction rope is connected to the second lifting hook, and the other end is connected to the rotating block through the opening and the rope-passing hole. This technical solution, through the traction rope, allows for convenient movement of the rotating block, thus enabling the switching of the rotating block's state.

[0020] In some embodiments, the top of the boom is provided with a lifting lug for connecting the lifting equipment. This technical solution addresses the issue that the lifting lug provides a stable and standardized connection point for the boom, making the connection between the boom and the lifting equipment more reliable and convenient.

[0021] In some embodiments, a support leg is provided below the connecting rod to limit the depth of the lifting rod's insertion into the precast block. The support leg is arranged parallel to the lifting rod, and when the lifting rod is inserted into the lifting hole inside the precast block, the bottom of the support leg rests against the surface of the precast block. This technical solution, through the setting of the support leg, can accurately limit the insertion depth of the lifting rod, avoiding safety accidents such as tilting or falling of the precast block due to improper insertion depth of the lifting rod.

[0022] In some embodiments, the upper diameter of the lifting hole is larger than the diameter of the lifting rod but smaller than the length of the rotating block, while the lower diameter is larger than the length of the rotating block. This technical solution not only meets the needs of different stages during the lifting operation but also ensures the stability of the connection between the rotating block and the lifting hole.

[0023] Based on the above solution, the lifting device for hoisting precast blocks in this embodiment of the invention features a rotating block at the lower part of the lifting rod, allowing the lifting rod to be firmly engaged in the lifting hole of the precast block. This ensures that the precast block can be lifted more quickly and without shifting during hoisting and placement. Simultaneously, the inclusion of traction and elastic components allows for rapid switching between the open and retracted states of the rotating block, enabling quick completion of lifting, positioning, and installation operations for the precast blocks, significantly improving hoisting efficiency. Furthermore, the lifting device in this embodiment has a simple structure and is easy to operate, requiring no complex adjustment or monitoring equipment, reducing the skill requirements for operators and effectively lowering construction costs. Attached Figure Description

[0024] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0025] Figure 1 This is a perspective view of the rotating block in the lifting device used for hoisting prefabricated blocks in Embodiment 1 of this utility model when it is retracted;

[0026] Figure 2 This is a perspective view of the rotating block in the lifting device used for hoisting prefabricated blocks in Embodiment 1 of this utility model when it is open;

[0027] Figure 3 This is a side view of the lifting device used for hoisting prefabricated blocks according to Embodiment 1 of this utility model;

[0028] Figure 4 for Figure 3 A sectional view along line AA.

[0029] Figure 5 This is a schematic diagram of the connection between the lifting device and the hoisting equipment used for hoisting precast blocks in Embodiment 1 of this utility model;

[0030] Figure 6 This is a schematic diagram of the lifting device used for lifting prefabricated blocks in Embodiment 1 of this utility model.

[0031] Figure 7 This is a perspective view of the rotating block in the lifting device used for hoisting prefabricated blocks in Embodiment 2 of this utility model when it is open;

[0032] Figure 8 This is a perspective view of the rotating block in the lifting device used for hoisting prefabricated blocks in Embodiment 2 of this utility model when it is retracted;

[0033] Figure 9 This is a side view of the lifting device used for hoisting prefabricated blocks in Embodiment 2 of this utility model.

[0034] In the picture:

[0035] 1. Lifting boom; 2. Connecting rod; 3. Rotating block; 4. Traction component; 5. Tension spring; 6. Torsion spring; 7. Precast block; 8. First lifting hook; 9. Second lifting hook; 10. Outrigger;

[0036] 101. Lifting lug; 102. Opening;

[0037] 301. Fixed shaft; 302. Limiting rod; 303. Rope threading hole;

[0038] 701, lifting hole; 702, pad block; 801, lifting strap; 901, anchor chain. Detailed Implementation

[0039] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0040] In the description of this utility model, it should be understood that the terms "center", "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0041] The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature.

[0042] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0043] like Figures 1-9As shown, in one embodiment of the lifting device for hoisting precast blocks according to this utility model, the lifting device for hoisting precast blocks includes a lifting rod 1, a connecting rod 2, a rotating block 3, a traction member 4, and an elastic member; wherein, at least one lifting rod 1 is provided, the top of the lifting rod 1 is used to connect to a first lifting hook 8, and the lower part of the lifting rod 1 is used to extend into the lifting hole 701 inside the precast block 7 to lift the precast block 7; the connecting rod 2 is installed between adjacent lifting rods 1 for connecting the lifting rods 1; the lower part of the lifting rod 1 has a through hole, and the rotating block 3 is installed in the through hole and rotatably connected to the lifting rod 1; The rotating block 3 has an open state and a retracted state. When the rotating block 3 is in the retracted state, the lifting rod 1 can extend into the lifting hole 701; when the rotating block 3 is in the open state, the rotating block 3 is locked in the lifting hole 701 to lift the precast block 7; the lifting rod 1 is hollow inside, and the traction member 4 is set inside the lifting rod 1, one end of which is connected to the second lifting hook 9, and the other end is connected to the rotating block 3, for pulling the rotating block 3 to retract; an elastic member is also provided in the through hole at the lower part of the lifting rod 1, and the elastic member is elastically connected to the rotating block 3, for releasing the elastic force to make the rotating block 3 return to the open state; Figure 1 As shown, when the rotating block 3 is in the retracted state, the elastic element is in the stretched state; as Figure 2 As shown, when the rotating block 3 is in the open state, the elastic element is in the contracted state.

[0044] In the above illustrative embodiment, the lifting device for hoisting the precast blocks utilizes a rotating block 3 at the lower part of the lifting rod 1. This allows the lifting rod 1 to be securely engaged within the lifting hole 701 of the precast block 7, ensuring that the precast block 7 can be lifted more quickly and without shifting during hoisting and placement. Simultaneously, the traction member 4 and elastic member enable rapid switching between the open and retracted states of the rotating block 3, thereby quickly completing the lifting, positioning, and installation of the precast block 7, significantly improving the hoisting efficiency. Furthermore, the lifting device in this embodiment has a simple structure and is easy to operate, requiring no complex adjustment or monitoring equipment, reducing the skill requirements for operators and effectively lowering construction costs.

[0045] In some embodiments, such as Figure 3 As shown, a fixed shaft 301 for fixing the rotating block 3 is provided inside the through hole, and the rotating block 3 is rotatably connected to the fixed shaft 301. The fixed shaft 301 provides a stable and reliable structural foundation for the installation and rotation of the rotating block 3, while limiting the rotation path and position of the rotating block 3. This ensures that the rotating block 3 can accurately and stably switch between open and retracted states within the through hole of the rod 1, avoiding instability such as shaking or offset during the movement of the rotating block 3, and improving the accuracy and reliability of the rotating block 3's operation.

[0046] In some embodiments, such as Figure 4As shown, the traction component 4 includes a traction rope. The top of the boom 1 has an opening 102, and the rotating block 3 has a rope-passing hole 303 for threading the traction rope. One end of the traction rope is connected to the second lifting hook 9, and the other end passes through the opening 102 and the rope-passing hole 303 to connect to the rotating block 3. The traction rope allows for easy movement of the rotating block 3, enabling the switching of its state and making state adjustment more convenient and efficient.

[0047] Furthermore, such as Figure 5 As shown, an anchor chain 901 is also provided between the traction rope and the second lifting hook 9. One end of the anchor chain 901 is connected to the traction rope, and the other end is connected to the second lifting hook 9. When it is necessary to adjust the rotating block 3 to the retracted state, the second lifting hook 9 is lifted, and the anchor chain 901 and the traction rope are pulled upward in sequence to lift one end of the rotating block 3 to adjust the rotating block 3 to the retracted state. When it is necessary to adjust the rotating block 3 to the open state, the second lifting hook 9 is loosened, the anchor chain 901 and the traction rope are slack, and the rotating block 3 is quickly restored to the open state by the elastic force of the elastic element. When lifting the second lifting hook 9, the anchor chain 901 and the traction rope pull one end of the rotating block 3 in sequence to accurately adjust the rotating block 3 to the retracted state. When the second lifting hook 9 is loosened, the anchor chain 901 and the traction rope are slack, and the rotating block 3 slowly restores to the open state by its own weight. If a rapid restoration to the open state is required, it can also be combined with the adjusting element. The anchor chain 901 not only optimizes the controllability of the state transition of the rotating block 3, but also provides a variety of speed adjustment options, enhancing the adaptability of the lifting equipment under different working conditions, meeting diverse lifting operation needs, and further improving the flexibility and convenience of lifting operations.

[0048] In some embodiments, such as Figure 3 As shown, the top of the boom 1 is provided with a lifting lug 101 for connecting to the lifting equipment. The lifting lug 101 provides a stable and standardized connection point for the boom 1, making the connection between the boom 1 and the lifting equipment more reliable and convenient.

[0049] Furthermore, such as Figure 5 As shown, a lifting strap 801 passes through the lifting lug 101, with one end of the lifting strap 801 connected to each lifting lug 101 and to the first lifting hook 8. By setting up the lifting strap 801, the flexibility and good load-bearing capacity of the lifting strap 801 can be utilized to adapt to changes in different angles and stress conditions while ensuring connection strength.

[0050] In some embodiments, such as Figure 9As shown, a support leg 10 is provided below the connecting rod 2 to limit the depth of the lifting rod 1 inside the precast block 7. The support leg 10 is set parallel to the lifting rod 1. When the lifting rod 1 is inserted into the lifting hole 701 inside the precast block 7, the bottom of the support leg 10 abuts against the surface of the precast block 7. By setting the support leg 10, the insertion depth of the lifting rod 1 can be accurately limited, avoiding safety accidents such as tilting or falling off of the precast block 7 due to improper insertion depth of the lifting rod 1. Moreover, it helps to ensure the consistency of the installation position of the precast block 7 during the construction of gravity block wharves or dams, thus improving the quality of the entire project.

[0051] It should be noted that, as Figure 6 As shown, the upper diameter of the lifting hole 701 is larger than the diameter of the lifting rod 1 but smaller than the length of the rotating block 3, while the lower diameter is larger than the length of the rotating block 3. Through the design of the lifting hole 701's diameter, combined with the working principle of the lifting device, the upper diameter of the lifting hole 701 allows the lifting rod 1 to smoothly extend into the lifting hole 701, and the rotating block 3 can also pass smoothly when retracted. The lower diameter of the lifting hole 701, being larger than the length of the rotating block 3, ensures that the rotating block 3 can be stably locked within the lifting hole 701 when open, providing reliable support for lifting the precast block 7. This satisfies the needs of different stages during the lifting operation and ensures the stability of the connection between the rotating block 3 and the lifting hole 701.

[0052] In some embodiments, such as Figure 6 As shown, a pad 702 is also provided in the lifting hole 701 inside the precast block 7. When the rotating block 3 is in the open state, the rotating block 3 and the pad 702 are in contact. By setting the pad 702, the friction and support area of ​​the contact part between the rotating block 3 and the precast block 7 are increased. During the lifting process, the weight of the precast block 7 can be better distributed, reducing the local stress concentration between the rotating block 3 and the lifting hole 701, reducing the risk of damage to the rotating block 3 or the lifting hole 701, thereby ensuring the safety and reliability of the precast block 7 lifting process, helping to extend the service life of the lifting equipment and the precast block 7, and ensuring the smooth progress of the precast block 7 lifting operation during the construction of gravity block wharves or dams.

[0053] In some embodiments, such as Figure 7 As shown, there are four lifting rods 1 and four connecting rods 2. The four connecting rods 2 are connected end to end, and the lifting rods 1 are installed at the joints of every two connecting rods 2. Through the installation of the four lifting rods 1 and connecting rods 2, a stable frame system is formed. The four connecting rods 2 and the lifting rods 1 cooperate with each other to evenly distribute the weight of the precast block 7, improving the overall load-bearing capacity and stability of the lifting equipment. Furthermore, this regular structural layout can better resist external interference, maintain the balance of the precast block 7, and reduce the swaying or tilting of the precast block 7 caused by uneven force, thereby improving the safety and accuracy of the lifting operation, while also facilitating installation, debugging and maintenance.

[0054] Example 1

[0055] In some embodiments, such as Figure 4 As shown, a limiting rod 302 is provided inside the through hole. The limiting rod 302 is used to limit the rotation angle of the rotating block 3 when it is retracted. By setting the limiting rod 302, it can be ensured that the rotating block 3 accurately reaches the preset retraction angle, avoiding interference between the rotating block 3 and the lifting rod 1 or other components due to excessive rotation, or insufficient rotation angle that cannot meet the lifting requirements.

[0056] Furthermore, such as Figure 3 As shown, the elastic element is a tension spring 5, with one end fixed to the bottom of the through hole and the other end connected to the rotating block 3. The tension spring 5 has excellent elastic properties, effectively storing elastic potential energy when the rotating block 3 is pulled up by the traction member 4. When the traction member 4 is released, the tension spring 5 can quickly and stably release the stored elastic potential energy, allowing the rotating block 3 to quickly and accurately return to the open state. The elastic force of the tension spring 5 can be reasonably selected and adjusted according to the weight of the prefabricated block 7 and actual hoisting requirements to ensure that the rotating block 3 can smoothly complete the opening action under different working conditions.

[0057] In some embodiments, such as Figure 3 As shown, fasteners for fixing the tension spring 5 are installed at the bottom of the through hole and on the rotating block 3. In an illustrative embodiment, the fasteners are T-shaped. The vertical end of the T-shaped fastener is installed at the bottom of the through hole or on the rotating block 3, and the horizontal bar of the T-shaped fastener is used to connect the tension spring 5. By installing T-shaped fasteners for fixing the tension spring 5 at the bottom of the through hole and on the rotating block 3, the stability and reliability of the tension spring 5's fixation are greatly enhanced. The vertical end of the T-shaped structure is firmly installed at the bottom of the through hole or on the rotating block 3, ensuring a firm connection between the fastener and the component, preventing loosening or detachment. The horizontal bar connects the tension spring 5, providing a reliable connection point so that the tension spring 5 can accurately transmit elastic force during stretching and contraction, ensuring smooth switching of the rotating block 3 between its retracted and open states. This fixing method improves the overall stability of the lifting device structure, effectively avoiding abnormal state switching of the rotating block 3 due to unstable fixing of the tension spring 5, ensuring safe and smooth lifting operations of the precast block 7, and improving the working performance and service life of the lifting device.

[0058] Example 2

[0059] In some embodiments, such as Figure 8 As shown, a limiting rod 302 is provided inside the through hole. The limiting rod 302 is used to limit the rotation angle of the rotating block 3 when it is retracted. By setting the limiting rod 302, it can be ensured that the rotating block 3 accurately reaches the preset retraction angle, avoiding interference between the rotating block 3 and the lifting rod 1 or other components due to excessive rotation, or insufficient rotation angle that cannot meet the lifting requirements.

[0060] In some embodiments, such as Figure 9 As shown, the elastic element is a torsion spring 6. The helical portion of the torsion spring 6 is wound around the limiting rod 302, and the torsion arm of the torsion spring 6 contacts the rotating block 3. The torsion spring 6 has excellent torque characteristics, and can effectively store torsional elastic potential energy during the process of the rotating block 3 being pulled up by the traction component 4. When the traction component 4 is released, the torsion spring 6 quickly releases the stored energy, pushing the rotating block 3 to quickly return to the open state with a stable and precise torque. Its torque can be reasonably selected and adjusted according to the actual needs such as the weight of the precast block 7 and the lifting conditions, ensuring that the rotating block 3 can smoothly complete the opening action under different conditions. This elastic reset method based on the torsion spring 6 greatly enhances the overall performance of the lifting device and significantly improves the efficiency and safety of the precast block 7 lifting operation.

[0061] The above embodiments 1 and 2 provide two different elastic element setting schemes, each of which can release the elastic force to restore the rotating block 3 to the open state.

[0062] The following describes the lifting method of the lifting device for lifting precast blocks according to this utility model:

[0063] S1, use the traction component 4 to adjust the rotating block 3 to the retracted state; connect the top of the boom 1 to the first lifting hook 8, lift the first lifting hook 8, and control the boom 1 to enter the lifting hole 701 of the precast block 7;

[0064] S2, by adjusting the rotating block 3 to the open state via the elastic element, the first lifting hook 8 is raised, as follows: Figure 6 As shown, the rotating block 3 is locked in the lifting hole 701, and the lifting rod 1 drives the precast block 7 to be lifted to the preset position;

[0065] S3, lower the first lifting hook 8, use the traction component 4 to adjust the rotating block 3 to the retracted state, and raise the first lifting hook 8 again so that the lifting rod 1 leaves the lifting hole 701.

[0066] It should be noted that the method of adjusting the rotating block 3 to the retracted state using the traction component 4 includes: connecting the traction component 4 to the second lifting hook 9, lifting the second lifting hook 9, and the rotating block 3 rotating upwards and retracting with the traction component 4.

[0067] It should also be noted that when the rotating block 3 retracts upward with the traction member 4, the elastic member stores force. The method of adjusting the rotating block 3 to the open state using the elastic member includes: releasing the second lifting hook 9, slackening the traction member 4, and the rotating block 3 returning to the open state under the elastic force of the elastic member. Specifically, in embodiment 1, the rotating block 3 returns to the open state under the elastic force of the tension spring 5; in embodiment 2, the rotating block 3 returns to the open state under the elastic force of the torsion spring 6.

[0068] Through the description of several embodiments of the lifting device for hoisting precast blocks according to the present invention, it can be seen that the embodiments of the lifting device for hoisting precast blocks according to the present invention have at least one or more of the following advantages:

[0069] 1. The lifting device for hoisting precast blocks provided by this utility model, by setting a rotating block 3 at the lower part of the lifting rod 1, allows the lifting rod 1 to be firmly locked in the lifting hole 701 of the precast block 7, ensuring that the precast block 7 can be lifted more quickly and that no displacement will occur during the hoisting and placement process;

[0070] 2. The lifting device for hoisting precast blocks provided by this utility model, through the setting of the traction component 4 and the elastic component, can quickly realize the conversion between the open state and the retracted state of the rotating block 3, thereby enabling the lifting, positioning and installation of the precast block 7 to be completed quickly, greatly improving the hoisting efficiency of the precast block 7.

[0071] 3. The lifting device for hoisting precast blocks provided by this utility model has a simple structure and is easy to operate. It does not require complex adjustment and monitoring equipment, which reduces the technical requirements for operators and can effectively reduce construction costs.

[0072] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0073] The above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A lifting device for hoisting precast blocks, characterized in that, include: A lifting rod is provided, at least one lifting rod is provided, the top of the lifting rod is used to connect the first lifting hook, and the lower part of the lifting rod is used to extend into the lifting hole inside the precast block to lift the precast block; A connecting rod, which is installed between adjacent booms, is used to connect the booms; The rotating block has a through hole at the bottom of the lifting rod. The rotating block is installed in the through hole and is rotatably connected to the lifting rod. The rotating block has an open state and a retracted state. When the rotating block is in the retracted state, the lifting rod can extend into the lifting hole. When the rotating block is in the open state, the rotating block is locked in the lifting hole to lift the precast block. The traction component is hollow inside the boom. One end of the traction component is connected to the second lifting hook, and the other end is connected to the rotating block. It is used to pull the rotating block to retract. An elastic element is also provided in the through hole at the lower part of the rod. The elastic element is elastically connected to the rotating block and is used to release the elastic force so that the rotating block returns to the open state. When the rotating block is in the retracted state, the elastic element is in the stretched state; when the rotating block is in the open state, the elastic element is in the contracted state.

2. The lifting device for hoisting precast blocks according to claim 1, characterized in that, A limiting rod is provided inside the through hole, which is used to limit the rotation angle when the rotating block is retracted.

3. The lifting device for hoisting precast blocks according to claim 2, characterized in that, The elastic element is a tension spring, with one end fixed to the bottom of the through hole and the other end connected to the rotating block.

4. The lifting device for hoisting precast blocks according to claim 3, characterized in that, Fixtures for securing the tension spring are installed at the bottom of the through hole and on the rotating block.

5. The lifting device for hoisting precast blocks according to claim 2, characterized in that, The elastic element is a torsion spring, the helical part of which is wound around the limiting rod, and the torsion arm of the torsion spring is in contact with the rotating block.

6. The lifting device for hoisting precast blocks according to claim 1, characterized in that, The through hole has a fixed shaft for fixing the rotating block, and the rotating block is rotatably connected to the fixed shaft.

7. The lifting device for hoisting precast blocks according to claim 1, characterized in that, The traction component includes a traction rope, an opening at the top of the boom, and a rope threading hole for threading the traction rope through the rotating block. One end of the traction rope is connected to the second lifting hook, and the other end is connected to the rotating block through the opening and the rope threading hole.

8. The lifting device for hoisting precast blocks according to claim 1, characterized in that, The top of the boom is equipped with lugs for connecting lifting equipment.

9. The lifting device for hoisting precast blocks according to claim 1, characterized in that, Below the connecting rod is a support leg for limiting the depth of the rod's insertion into the precast block. The support leg is set parallel to the rod, and when the rod is inserted into the lifting hole inside the precast block, the bottom of the support leg abuts against the surface of the precast block.

10. The lifting device for hoisting precast blocks according to claim 1, characterized in that, The upper diameter of the lifting hole is larger than the diameter of the lifting rod but smaller than the length of the rotating block, while the lower diameter is larger than the length of the rotating block.

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