Self-balancing lifting appliance for lifting prefabricated square block

Abstract

The utility model relates to a self-balancing 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 and an adjusting 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 suspenders and used for connecting the suspenders; the adjusting piece comprises a vertical adjusting piece or a horizontal adjusting piece; wherein the vertical adjusting piece is arranged on part of the suspender, is in sliding connection with the suspender and is used for adjusting the vertical position of the suspender; the horizontal adjusting piece is arranged at the connecting rod, slidably connected with the connecting rod and used for adjusting the horizontal length of the connecting rod. According to the self-balancing lifting appliance, through the arrangement of the vertical adjusting piece or the horizontal adjusting piece, the lifting appliance can automatically adjust the balance of the prefabricated square block in the lifting process, the inclination problem caused by uneven stress is avoided, and therefore the lifting efficiency and accuracy are improved.

Description

Technical Field

[0001] This utility model belongs to the field of lifting equipment technology, and in particular relates to a self-balancing 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. During the hoisting process, the precast blocks often tilt due to unbalanced forces, resulting in a significant time commitment for adjustment and positioning.

[0004] Therefore, how to provide a lifting device that can achieve self-balancing of prefabricated blocks during the hoisting process is a technical problem that urgently needs to be solved. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a self-balancing lifting device for hoisting precast blocks. By setting vertical or horizontal adjustment components, the lifting device can automatically adjust the balance of the precast blocks during the hoisting process, avoiding tilting problems caused by uneven force, thereby improving hoisting efficiency and accuracy.

[0006] This utility model provides a self-balancing lifting device for hoisting precast blocks, comprising:

[0007] 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;

[0008] A connecting rod is installed between adjacent booms to connect them.

[0009] Adjusting components include vertical adjusting components or horizontal adjusting components; wherein, the vertical adjusting component is disposed on part of the suspension rod and slidably connected to the suspension rod, and is used to adjust the vertical position of the suspension rod; the horizontal adjusting component is disposed on the connecting rod and slidably connected to the connecting rod, and is used to adjust the horizontal length of the connecting rod.

[0010] This technical solution, through the installation of vertical or horizontal adjustment components, enables the lifting equipment to automatically adjust the balance of the precast blocks during the lifting process, avoiding tilting problems caused by uneven force, thereby improving lifting efficiency and accuracy.

[0011] In some embodiments, the vertical adjustment component includes a sleeve fitted around the outer periphery of the boom, with the boom and sleeve slidably connected vertically, and the sleeve fixedly connected to an adjacent connecting rod. This technical solution achieves the vertical adjustment function of the boom through the sliding connection between the sleeve and the boom.

[0012] In some embodiments, the contact surface between the boom and the sleeve is provided with a guide rail, and the contact surface between the sleeve and the boom is provided with a sliding groove, allowing the sleeve to slide vertically along the guide rail via the sliding groove. This technical solution, through the provision of the guide rail and the sliding groove, enables the boom to slide vertically along the direction of the guide rail and the sliding groove, ensuring the vertical adjustment direction of the boom.

[0013] In some embodiments, the leveling component includes a sleeve, which is hollow inside. A first end of the sleeve is connected to the lifting rod, and a second end is open, with the second end used to engage with a connecting rod. This technical solution, through the sleeve, enables the leveling function of the lifting device, while allowing the self-balancing lifting device to adapt to prefabricated blocks of more sizes.

[0014] In some embodiments, the leveling component further includes a connecting pin, which is inserted into the sleeve and a connecting rod sleeved within the sleeve, for connecting the sleeve and the connecting rod. This technical solution, through the use of the connecting pin, enables a stable connection between the sleeve and the connecting rod.

[0015] In some embodiments, a limiting plate is provided inside the sleeve near the end of the lifting rod to limit the insertion depth of the connecting rod. This technical solution, by setting the limiting plate, can limit the insertion depth of the connecting rod, preventing excessive insertion and compromising the structural stability of the connection between the sleeve and the lifting rod.

[0016] In some embodiments, the self-balancing lifting device for hoisting prefabricated blocks further includes:

[0017] 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.

[0018] The traction rope and boom are hollow inside with an opening at the top. One end of the traction rope is connected to the second lifting hook, and the other end passes through the opening and connects to the rotating block to control the state of the rotating block. This technical solution, through the setting of the rotating block, allows the boom to be securely locked within the lifting hole of the precast block, ensuring that the precast block will not shift or fall during hoisting, thus enhancing the stability and safety of the hoisting process. The traction rope also ensures that the equipment can smoothly adjust the state of the rotating block, thereby achieving stable hoisting of the precast block.

[0019] In some embodiments, a fixing shaft for fixing the rotating block is provided inside the through hole, and the rotating block is rotatably connected to the fixing shaft. This technical solution ensures that the rotating block can rotate stably during hoisting by setting a fixing shaft inside the through hole and rotatably connecting the rotating block to the fixing shaft.

[0020] 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 limits the rotation angle of the rotating block when it is retracted by setting a limiting rod inside the through hole, preventing the rotating block from rotating excessively and ensuring that the rotating block can be accurately positioned when it is retracted.

[0021] In some embodiments, the rotating block has a threading hole for threading a traction rope. This technical solution, by providing the threading hole, allows the traction rope to pass smoothly through and connect to the rotating block, facilitating control of the rotating block's state.

[0022] Based on the above solution, the self-balancing lifting device for hoisting precast blocks in this embodiment of the present invention, through the setting of vertical or horizontal adjustment components, can automatically adjust the balance of the precast blocks during the hoisting process, avoiding tilting problems caused by uneven force, thereby improving hoisting efficiency and accuracy; since the lifting device can automatically adjust the balance, the adjustment and positioning time is reduced, thereby improving construction efficiency and saving construction time and costs; furthermore, the self-balancing lifting device in this embodiment has a reasonable structural design, is easy to operate, reduces the reliance on manual adjustment during the hoisting process, and reduces construction difficulty and labor intensity. Attached Figure Description

[0023] 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:

[0024] Figure 1 This is a diagram showing the usage state of the self-balancing lifting device used for hoisting prefabricated blocks in an embodiment of this utility model;

[0025] Figure 2 This is a perspective view of the self-balancing lifting device rotating block used for hoisting prefabricated blocks in an embodiment of the present invention, with the rotating block of the device open.

[0026] Figure 3 This is a perspective view of the retracted rotating block of the self-balancing lifting device used for hoisting prefabricated blocks in an embodiment of the present invention;

[0027] Figure 4 This is a side view of the self-balancing lifting device used for hoisting prefabricated blocks in an embodiment of this utility model;

[0028] Figure 5 for Figure 4Cross-sectional view along section line AA;

[0029] Figure 6 This is a structural schematic diagram of the self-balancing lifting device used for hoisting prefabricated blocks in an embodiment of this utility model;

[0030] Figure 7 This is a schematic diagram of the structure of the self-balancing lifting device for hoisting prefabricated blocks connected to the lifting equipment in an embodiment of this utility model;

[0031] Figure 8 This is a diagram showing the usage state of the self-balancing lifting device used for hoisting prefabricated blocks in an embodiment of this utility model.

[0032] In the picture:

[0033] 1. Lifting rod; 2. Connecting rod; 3. Vertical adjusting component; 4. Horizontal adjusting component; 5. Rotating block; 6. Traction rope; 7. Precast block; 8. First lifting hook; 9. Second lifting hook;

[0034] 101. Lifting lug; 102. Opening; 103. Guide rail; 104. Mounting platform;

[0035] 301. Sleeve;

[0036] 401. Sleeve; 402. Connecting pin; 403. Limiting plate;

[0037] 501. Fixed shaft; 502. Limiting rod; 503. Rope threading hole;

[0038] 701, lifting hole; 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 1-8 As shown, in one embodiment of the self-balancing lifting device for hoisting precast blocks according to this utility model, the self-balancing lifting device for hoisting precast blocks includes a lifting rod 1, a connecting rod 2, and an adjusting component; 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 adjusting component includes a vertical adjusting component 3 or a horizontal adjusting component 4; wherein, the vertical adjusting component 3 is provided on part of the lifting rod 1 and is slidably connected to the lifting rod 1 for adjusting the vertical position of the lifting rod 1; the horizontal adjusting component 4 is provided at the connecting rod 2 and is slidably connected to the connecting rod 2 for adjusting the horizontal length of the connecting rod 2.

[0044] In the above illustrative embodiment, the self-balancing lifting device used for hoisting the precast blocks, through the setting of vertical adjustment component 3 or horizontal adjustment component 4, can automatically adjust the balance of the precast blocks 7 during the hoisting process, avoiding tilting problems caused by uneven force, thereby improving hoisting efficiency and accuracy; since the lifting device can automatically adjust the balance, the adjustment and positioning time is reduced, thereby improving construction efficiency and saving construction time and costs; furthermore, the self-balancing lifting device in this embodiment has a reasonable structural design, is easy to operate, reduces the reliance on manual adjustment during the hoisting process, and reduces construction difficulty and labor intensity.

[0045] It should be noted that the vertical adjusting component 3 and the horizontal adjusting component 4 can be simultaneously installed on a self-balancing lifting device used for hoisting precast blocks, or either the vertical adjusting component 3 or the horizontal adjusting component 4 can be selected as needed. In other words, the vertical adjusting component 3 and the horizontal adjusting component 4 can be installed simultaneously on the self-balancing lifting device to achieve more precise balance adjustment; alternatively, one can be selected based on specific needs to simplify the structure, reduce costs, and still effectively improve stability and safety during the hoisting process.

[0046] In some embodiments, such as Figure 1 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 5, while the lower diameter is larger than the length of the rotating block 5. A horizontal step is provided at the point where the diameter of the lifting hole 701 changes, and the rotating block 5 is locked in the horizontal step when it is in the open state. By limiting the dimensions of the lifting hole 701 and the rotating block 5, it is ensured that the rotating block 5 is securely locked in the lifting hole 701 during the lifting process, further improving the stability and safety of the lifting.

[0047] In some embodiments, such as Figure 5 As shown, the vertical adjustment component 3 includes a sleeve 301 fitted around the outer periphery of the lifting rod 1. The lifting rod 1 and the sleeve 301 are vertically slidably connected, and the sleeve 301 is fixedly connected to the adjacent connecting rod 2. Through the sliding connection between the sleeve 301 and the lifting rod 1, the vertical adjustment function of the lifting rod 1 is realized, enhancing the balance and stability of the precast block 7 during the hoisting process.

[0048] Furthermore, such as Figure 4 As shown, the contact surface between the boom 1 and the sleeve 301 is provided with a guide rail 103, and the contact surface between the sleeve 301 and the boom 1 is provided with a sliding groove. The sleeve 301 slides vertically along the guide rail 103 through the sliding groove. The guide rail 103 and the sliding groove allow the boom 1 to slide vertically along the direction of the guide rail 103 and the sliding groove, ensuring the vertical adjustment direction of the boom 1 and further improving the balance and stability of the lifting process.

[0049] In some embodiments, such as Figure 5 As shown, the outer periphery of the boom 1 is also provided with a locking platform 104 for limiting the sliding position of the boom 1. When the locking platform 104 is locked at the bottom of the sleeve 301, the boom 1 slides to the highest position.

[0050] In some embodiments, such as Figure 6 As shown, the horizontal adjustment component 4 includes a sleeve 401, which is hollow inside. The first end of the sleeve 401 is connected to the lifting rod 1, and the second end is open. The second end of the sleeve 401 is used to connect with the connecting rod 2. The sleeve 401 enables the horizontal adjustment function of the lifting device, and also allows the self-balancing lifting device to adapt to prefabricated blocks 7 of more sizes.

[0051] In some embodiments, such as Figure 7 As shown, the horizontal adjustment component 4 also includes a connecting pin 402, which is inserted into the sleeve 401 and the connecting rod 2 sleeved inside the sleeve 401, for connecting the sleeve 401 and the connecting rod 2. The connecting pin 402 ensures a stable connection between the sleeve 401 and the connecting rod 2, guaranteeing the reliability and safety of the lifting device during horizontal adjustment.

[0052] In some embodiments, such as Figure 8As shown, a limiting plate 403 is provided inside the sleeve 401 near the end of the lifting rod 1 to limit the fitting depth of the connecting rod 2. By setting the limiting plate 403, the fitting depth of the connecting rod 2 can be limited, preventing the connecting rod 2 from being over-inserted and compromising the structural stability of the connection between the sleeve 401 and the lifting rod 1.

[0053] In some embodiments, the self-balancing lifting device for hoisting precast blocks further includes a rotating block 5 and a traction rope 6; wherein, a through hole is provided at the lower part of the lifting rod 1, the rotating block 5 is installed in the through hole and rotatably connected to the lifting rod 1; the rotating block 5 includes an open state and a retracted state, such as... Figure 3 As shown, when the rotating block 5 is in the retracted state, the lifting rod 1 can extend into the lifting hole 701; as Figure 2 As shown, when the rotating block 5 is in the open state, the rotating block 5 is engaged in the lifting hole 701 to lift the prefabricated block 7; as Figure 5 As shown, the boom 1 is hollow inside, with an opening 102 at the top. One end of the traction rope 6 is connected to the second lifting hook 9, and the other end passes through the opening 102 and is connected to the rotating block 5 to control the state of the rotating block 5. With the rotating block 5 in place, the boom 1 can be securely locked in the lifting hole 701 of the precast block 7, ensuring that the precast block 7 will not shift or fall during the lifting process, thus enhancing the stability and safety of the lifting process. The traction rope 6 ensures that the equipment inside can smoothly adjust the state of the rotating block 5, thereby achieving stable lifting of the precast block 7.

[0054] In some embodiments, such as Figure 3 As shown, a fixed shaft 501 for fixing the rotating block 5 is provided inside the through hole, and the rotating block 5 is rotatably connected to the fixed shaft 501. By setting the fixed shaft 501 inside the through hole and making the rotating block 5 rotatably connected to the fixed shaft 501, the rotating block 5 can be stably rotated during the hoisting process, which improves the operational flexibility of the rotating block 5 and the reliability of the hoisting process.

[0055] In some embodiments, such as Figure 4 As shown, a limiting rod 502 is provided inside the through hole. The limiting rod 502 is used to limit the rotation angle of the rotating block 5 when it is retracted. By setting the limiting rod 502 inside the through hole, the rotation angle of the rotating block 5 when it is retracted is limited, preventing the rotating block 5 from rotating excessively and ensuring that the rotating block 5 can be accurately positioned when it is retracted, thereby improving the safety and stability of the hoisting process.

[0056] In some embodiments, such as Figure 3 As shown, the rotating block 5 has a rope hole 503 for threading the traction rope 6. The rope hole 503 allows the traction rope 6 to pass smoothly through and connect to the rotating block 5, facilitating the control of the state of the rotating block 5, thereby achieving precise hoisting and positioning of the precast block 7, and enhancing the convenience and reliability of the operation.

[0057] In some embodiments, such as Figure 1 As shown, the top of the boom 1 is provided with a lifting lug 101. The lifting lug 101 provides a convenient fixing point for connecting lifting equipment, ensuring the safety and stability of the lifting process.

[0058] As an illustrative embodiment, the traction rope 6 is connected to the anchor chain 901, and the anchor chain 901 is connected to the second lifting hook 9; the lifting lug 101 is connected to the sling 801, and the sling 801 is connected to the first lifting hook 8.

[0059] The following describes a lifting method for one embodiment of the self-balancing lifting device of this utility model for lifting precast blocks:

[0060] Connecting the lifting equipment: Connect one end of the traction rope 6 to the second lifting hook 9, and pass the other end through the opening 102 and the inside of the boom 1 and connect it to the rotating block 5. Lift the second lifting hook 9, and the traction rope 6 will drive the rotating block 5 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.

[0061] Lifting precast block 7: Insert the lower part of the lifting rod 1 into the lifting hole 701 inside the precast block 7, and connect the top of the lifting rod 1 to the first lifting hook 8 to lift the precast block 7.

[0062] Precast block 7 self-balancing: The vertical position of the suspension rod 1 or the horizontal length of the connecting rod 2 is automatically adjusted by the adjusting component to make the precast block 7 balanced.

[0063] In the above-described hoisting method, by inserting the lifting rod 1 into the lifting hole 701 of the precast block 7 and connecting it with the lifting hook, the precast block 7 can be quickly hoisted, simplifying the hoisting operation steps. The vertical position of the lifting rod 1 or the horizontal length of the connecting rod 2 is automatically adjusted using adjusting components, allowing the precast block 7 to automatically achieve balance during hoisting, reducing the time and error of manual adjustments. The self-balancing function reduces the risk of the precast block 7 tilting or falling, ensuring the safety of the hoisting process. In summary, the hoisting method provided in this embodiment not only simplifies the operation process but also improves construction efficiency and safety, making it suitable for various gravity-type block wharf or dam construction projects.

[0064] It should be noted that the step of lifting precast block 7 includes, before lifting precast block 7, loosening the second lifting hook 9 and slackening the traction rope 6, as follows: Figure 1 As shown, the rotating block 5 automatically returns to the open state, lifting the first lifting hook 8, and the rotating block 5 is locked in the lifting hole 701.

[0065] It should also be noted that in the self-balancing step of the precast block 7, the method of adjusting the vertical position of the lifting rod 1 using the vertical adjustment component 3 includes: the lifting rod 1, fitted inside the sleeve 301, automatically slides under the gravity of the precast block 7 to adjust the levelness of the precast block 7; the method of adjusting the horizontal length of the connecting rod 2 using the horizontal adjustment component 4 includes: adjusting the length of the connecting rod 2 fitted inside the sleeve 401 according to the size of the precast block 7 and its internal lifting hole 701, and connecting and fixing it using the connecting pin 402. The automatic sliding of the lifting rod 1 under the gravity of the precast block 7 enables adaptive adjustment of the vertical position, thereby ensuring the levelness of the precast block 7; simultaneously, by adjusting the length of the connecting rod 2 fitted inside the sleeve 401 and fixing it with the connecting pin 402, the horizontal length can be precisely adjusted according to the size of the precast block 7 and its lifting hole 701, further improving the stability and safety of the hoisting process.

[0066] In some embodiments, such as Figure 1 As shown, the first lifting hook 8 is connected to the top of the boom 1 via a sling 801, and the second lifting hook 9 is connected to the traction rope 6 via an anchor chain 901.

[0067] Through the description of several embodiments of the self-balancing lifting device for hoisting prefabricated blocks according to the present invention, it can be seen that the embodiments of the self-balancing lifting device for hoisting prefabricated blocks according to the present invention have at least one or more of the following advantages:

[0068] 1. The self-balancing lifting device for hoisting precast blocks provided by this utility model can automatically adjust the balance of the precast blocks 7 during the hoisting process by setting the vertical adjustment component 3 or the horizontal adjustment component 4, so as to avoid the tilting problem caused by uneven force, thereby improving the hoisting efficiency and accuracy.

[0069] 2. The self-balancing lifting device for hoisting precast blocks provided by this utility model can reduce the time for adjusting and positioning the precast blocks 7 during the hoisting process, thereby improving construction efficiency and saving construction time and costs.

[0070] 3. The self-balancing lifting device for hoisting precast blocks provided by this utility model has a reasonable structural design and is easy to operate, reducing the reliance on manual adjustment during the hoisting process and lowering the construction difficulty and labor intensity.

[0071] 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.

[0072] 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 self-balancing spreader for lifting 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 is installed between adjacent booms to connect them. Adjusting components include vertical adjusting components or horizontal adjusting components; wherein, the vertical adjusting component is disposed on part of the suspension rod and slidably connected to the suspension rod, and is used to adjust the vertical position of the suspension rod; the horizontal adjusting component is disposed on the connecting rod and slidably connected to the connecting rod, and is used to adjust the horizontal length of the connecting rod.

2. A self-balancing spreader for lifting precast blocks according to claim 1, characterised in that, The vertical adjustment component includes a sleeve that is fitted around the outer periphery of the boom, the boom and the sleeve are vertically slidably connected, and the sleeve is fixedly connected to the adjacent connecting rod.

3. A self-balancing spreader for lifting precast blocks according to claim 2, characterised in that, The contact surface between the boom and the sleeve is provided with a guide rail, and the contact surface between the sleeve and the boom is provided with a sliding groove, through which the sleeve slides vertically along the guide rail.

4. The self-balancing spreader for lifting precast blocks according to claim 1, characterized in that, The leveling component includes a sleeve, which is hollow inside. One end of the sleeve is connected to the boom, and the second end is open. The second end of the sleeve is used to connect with the connecting rod.

5. The self-balancing lifting device for hoisting precast blocks according to claim 4, characterized in that, The leveling component also includes a connecting pin, which is inserted into the sleeve and the connecting rod sleeved inside the sleeve, for connecting the sleeve and the connecting rod.

6. Self-balancing spreader for hoisting prefabricated blocks according to claim 4 or 5, characterized in that, The sleeve has a limiting plate at one end near the rod to limit the connection depth of the connecting rod.

7. The self-balancing spreader for lifting precast blocks according to claim 1, characterized in that, Also includes: 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 rope is hollow inside the boom with an opening at the top. One end of the traction rope is connected to the second lifting hook, and the other end passes through the opening and is connected to the rotating block to control the state of the rotating block.

8. A self-balancing spreader for lifting precast blocks according to claim 7, characterised 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.

9. The self-balancing spreader for lifting precast blocks according to claim 7, 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.

10. The self-balancing spreader for lifting precast blocks according to claim 7, characterized in that, The rotating block has a rope-threading hole for threading the traction rope.

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