A hoisting construction device for a steel structure workshop
The steel structure erection device addresses the challenge of unstable lifting by adjusting lift points and using a cushioning system to secure and stabilize variable cross-section components, enhancing safety and longevity.
Patent Information
- Application Number
- CN202510558992.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-30
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2045-04-30
AI Technical Summary
In the prior art, it is difficult to accurately determine the lifting point during lifting of steel components, especially variable cross-sectional components such as large span beams, trusses, cantilever beams, etc., which leads to tilt and shaking during lifting, posing a construction safety hazard.
A steel structure factory hoisting construction device is adopted, including a suspender, a suspender and a wire rope. The suspender is equipped with a driving mechanism and a winch. The driving mechanism controls the rotation of the winch to adjust the length of the wire rope to ensure the level of the component. The suspender is equipped with a fork wall and a tension rope clamping member, which combines a buffer spring and a telescopic column to protect the wire rope to prevent fatigue and breakage.
It improves the stability and safety of steel components lifting, reduces shaking and slipping, extends the service life of the wire rope, and enhances the safety and efficiency of construction.
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Figure CN120057725B_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of steel structure hoisting, and specifically relates to a steel structure factory building hoisting construction device. Background Art
[0002] A steel structure factory building is an industrial building mainly composed of steel as the main load-bearing structure, which is widely used in multiple fields such as manufacturing, warehousing, logistics, and office. It has the advantages of light weight, high strength, flexible shape, and fast construction speed. The hoisting construction of a steel structure factory building is an important link in modern industrial architecture. With the continuous increase in the building scale and structural complexity, the hoisting construction of a steel structure factory building is also facing more and more challenges.
[0003] A patent of Chinese Patent Application CN119079839A discloses a steel structure hoisting device for factory building construction. The key points of its technical solution are: including a sling for fixing at the end of the steel wire rope of a hoisting device. The sling includes a first arc-shaped plate and a second arc-shaped plate. The radian of the first arc-shaped plate is greater than π, and the radian of the second arc-shaped plate is less than π. The first arc-shaped plate and the second arc-shaped plate are hinged to each other and buckled into a cylindrical shape. The second arc-shaped plate is located above the first arc-shaped plate and rotatably buckled into the notch of the first arc-shaped plate. The steel wire rope of the hoisting device is divided into two parts and is respectively fixedly arranged on the outside of the first arc-shaped plate and symmetrically arranged along the axis of the first arc-shaped plate. A receiving seat is slidably arranged in the sling. There are two receiving seats, which are respectively located inside the first arc-shaped plate and the second arc-shaped plate. The receiving seat slides along the arc direction of the first arc-shaped plate and the second arc-shaped plate. A first driving member for driving the receiving seat to slide is arranged in the sling.
[0004] However, the current existing technology usually adopts a two-point hoisting method for steel components. However, in actual operation, it is difficult to accurately determine the hoisting points. Especially for some components with variable cross-sections, such as long-span beams, trusses, cantilever beams, etc., their cross-sectional shapes or sizes change continuously along the length direction, and it is difficult to judge the center of gravity position of the component. Therefore, it is impossible to quickly determine the specific hoisting part of the component during hoisting, resulting in the component tilting and shaking after being lifted, and there are potential construction safety hazards.
[0005] Therefore, the present invention provides a steel structure factory building hoisting construction device. Summary of the Invention
[0006] In order to make up for the deficiencies of the prior art and solve at least one of the technical problems proposed in the background art.
[0007] The technical solution adopted by the present invention to solve its technical problems is: A steel structure factory building hoisting construction device of the present invention includes a suspension seat, a sling, and a steel wire rope; a pair of slings and steel wire ropes are provided;
[0008] A pair of driving mechanisms are fixedly connected to the surface of the suspension seat; a pair of winches are rotatably connected to the bottom of the suspension seat, and the winches are respectively controlled to rotate by the driving mechanisms; a pair of steel wire ropes are respectively connected between the winches and the lifting appliance;
[0009] A pair of mounting blocks are fixedly connected to the side surface of the lifting appliance; a guide post is fixedly connected between the mounting blocks; a pair of fork walls are slidably connected to the surface of the guide post.
[0010] Preferably, a guide rod is fixedly connected to the bottom of the lifting appliance; a pair of movable rings are slidably connected to the surface of the guide rod; support ribs are respectively fixedly connected between the movable rings and the fork walls.
[0011] Preferably, an inclined cylinder is fixedly connected to the top of the lifting appliance; a piston is slidably connected inside the inclined cylinder; a telescopic column is fixedly connected to the upper side of the piston; a buffer spring is fixedly connected between the piston and the inclined cylinder; one end of the telescopic column extending outside the inclined cylinder is connected to the steel wire rope.
[0012] Preferably, a return spring is respectively fixedly connected between the fork wall and the mounting block; a connecting plate is fixedly connected to the top of the telescopic column; a tensioning rope is fixedly connected between the side of the fork wall away from the mounting block and the connecting plate; pulleys are arranged at the turning points of the tensioning rope.
[0013] Preferably, a group of anti-slip convex points are evenly distributed on the upper side surface of the fork wall.
[0014] Preferably, the connection between the piston and the inclined cylinder is a sliding seal connection; an air groove is formed inside the fork wall; a hose is communicated between the air groove and the bottom of the inclined cylinder; a group of guide holes are evenly distributed between the upper side of the fork wall and the air groove.
[0015] Preferably, a group of bent holes are formed inside the anti-slip convex points, and the outer ends of the bent holes are inclined downward; the bent holes are communicated with the guide holes.
[0016] Preferably, an air inlet is communicated with the bottom of the inclined cylinder; check valves are arranged inside the air inlet and the hose.
[0017] Preferably, chutes are formed at the positions corresponding to the steel wire ropes at the bottom of the suspension seat; sliders are slidably connected inside the chutes; compression springs are fixedly connected between the sliders and the chutes; coating rollers are rotatably connected to the bottoms of the sliders;
[0018] A cavity is formed inside the suspension seat; a transmission strip is arranged inside the cavity; the other end of the transmission strip is fixedly connected inside the slider, and the end of the transmission strip is attached to the coating roller; both the coating roller and the transmission strip are made of water-absorbing materials.
[0019] Preferably, a separation cup is fixedly connected to the bottom of the steel wire rope; a storage block is arranged inside the separation cup; the storage block is made of a water-absorbing material.
[0020] The beneficial effects of the present invention are as follows:
[0021] 1. For the steel structure factory building hoisting construction device of the present invention, two lifting tools are placed at both ends of the steel component, a pair of fork walls of the lifting tool are inserted into the groove of the component, and the installation block abuts against the end face of the component. Then, the lifting device is used to lift the lifting seat, so that the steel component rises slightly for a short distance and leaves the ground. At this time, the steel component is in a suspended state. If it tilts, the winch at the lower end of the component is controlled to rotate through the driving mechanism, and a length of the steel wire rope on this side is wound up until the component reaches a horizontal state. After that, normal hoisting operations can be carried out, which can improve the stability of the component after it is suspended, reduce the phenomena of shaking and slipping, and improve the construction safety and efficiency.
[0022] 2. For the steel structure factory building hoisting construction device of the present invention, when hoisting, the steel wire rope can drive the telescopic column to move outward from the inclined cylinder and compress the buffer spring. The buffer spring is used to buffer and relieve the tensile stress at the moment of hoisting, playing a role in protecting the steel wire rope and preventing problems such as fatigue and fracture of the steel wire rope due to excessive tension caused by the overweight of the steel component. It is applicable to large factory building components and extends the service life of this device.
[0023] 3. For the steel structure factory building hoisting construction device of the present invention, when the telescopic column extends upward, it can drive a pair of tension ropes to move upward synchronously through the connecting plate. Then, the lower end of the tension rope drives the fork wall to slide horizontally on the surface of the guide column, so as to promote the pair of fork walls to approach each other and clamp the middle part of the steel component, locking and fixing the lifting tool and the component, and preventing accidental separation between the lifting tool and the component during hoisting. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] The present invention will be further described below with reference to the drawings.
[0025] Figure 1 is a perspective view of the present invention;
[0026] Figure 2 is a schematic structural diagram of the lifting seat in the present invention;
[0027] Figure 3 is a schematic structural diagram of the lifting tool in the present invention;
[0028] Figure 4 is a schematic structural diagram of the lifting tool from another perspective in the present invention;
[0029] Figure 5 is Figure 4 a partial enlarged view at A in
[0030] Figure 6 It is a cross-sectional view of the fork wall in the present invention;
[0031] Figure 7 is Figure 6 the partial enlarged view at position B in
[0032] Figure 8 It is a cross-sectional view of the suspension seat in the present invention;
[0033] Figure 9 is Figure 8 the partial enlarged view at position C in
[0034] In the figure: suspension seat 1, lifting appliance 2, steel wire rope 3, driving mechanism 4, winch 5, mounting block 6, guide post 7, fork wall 8, guide rod 9, movable ring 10, support rib 11, inclined cylinder 12, piston 13, telescopic column 14, buffer spring 15, return spring 16, connecting plate 17, tensioning rope 18, pulley 19, anti-slip convex point 20, air groove 21, hose 22, guide hole 23, bent hole 24, air inlet 25, sliding groove 26, slider 27, compression spring 28, coating roller 29, cavity 30, transmission strip 31, isolation cup 32, storage block 33. Specific embodiments
[0035] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.
[0036] As Figures 1 to 9 shown, a steel structure workshop hoisting construction device described in the present invention includes a suspension seat 1, a lifting appliance 2 and a steel wire rope 3; a pair of the lifting appliance 2 and the steel wire rope 3 are provided;
[0037] A pair of driving mechanisms 4 are fixedly connected to the surface of the suspension seat 1; a pair of winches 5 are rotatably connected to the bottom of the suspension seat 1, and the winches 5 are respectively controlled to rotate by the driving mechanisms 4; a pair of the steel wire ropes 3 are respectively connected between the winches 5 and the lifting appliance 2;
[0038] A pair of mounting blocks 6 are fixedly connected to the side surface of the lifting appliance 2; a guide post 7 is fixedly connected between the mounting blocks 6; a pair of fork walls 8 are slidably connected to the surface of the guide post 7.
[0039] The prior art usually adopts a two-point hoisting method for steel components. However, in actual operation, it is difficult to accurately determine the hoisting points. Especially for some components with variable cross-sections, such as long-span beams, trusses, cantilever beams, etc., their cross-sectional shapes or dimensions change continuously along the length direction, and it is difficult to judge the center of gravity position of the components. Therefore, it is impossible to quickly determine the specific hoisting parts of the components during hoisting, resulting in the inclination and shaking of the components after being lifted, and there are potential construction safety hazards.
[0040] When the present invention is in use, two lifting tools 2 are placed at both ends of the steel member. A pair of fork walls 8 of the lifting tool 2 are inserted into the grooves of the member, and the mounting blocks 6 are abutted against the end face of the member. Then, the lifting device is used to lift the lifting seat 1, so that the steel member rises slightly by a small distance and leaves the ground. At this time, the steel member is in a suspended state. If it tilts, the winch 5 at the lower end of the member is controlled to rotate through the driving mechanism 4, and a length of the steel wire rope 3 on this side is wound up (or the steel wire rope 3 on the other side is released) until the member reaches a horizontal state. After that, normal lifting operations can be carried out, which can improve the stability of the member after it is lifted into the air, reduce the phenomena of shaking and slipping, and improve the construction safety and efficiency.
[0041] A guide rod 9 is fixedly connected to the bottom of the lifting tool 2; a pair of movable rings 10 are slidably connected to the surface of the guide rod 9; support ribs 11 are fixedly connected between the movable rings 10 and the fork walls 8 respectively. By providing the guide rod 9, the movable rings 10 and the support ribs 11, the support strength of the fork walls 8 for the steel member can be enhanced, and the lifting stability can be further improved.
[0042] As another embodiment of the present invention, an inclined cylinder 12 is fixedly connected to the top of the lifting tool 2; a piston 13 is slidably connected inside the inclined cylinder 12; a telescopic column 14 is fixedly connected to the upper side of the piston 13; a buffer spring 15 is fixedly connected between the piston 13 and the inclined cylinder 12; one end of the telescopic column 14 extending outside the inclined cylinder 12 is connected to the steel wire rope 3. When lifting, the steel wire rope 3 can drive the telescopic column 14 to move outside the inclined cylinder 12 and compress the buffer spring 15, and the buffer spring 15 is used to buffer and relieve the tensile stress at the moment of lifting, playing a role in protecting the steel wire rope 3, preventing the problem of fatigue and fracture of the steel wire rope 3 caused by excessive tension due to the overweight of the steel member, being applicable to large factory building members, and prolonging the service life of the device.
[0043] As another embodiment of the present invention, a reset spring 16 is fixedly connected between the fork walls 8 and the mounting blocks 6 respectively; a connecting plate 17 is fixedly connected to the top of the telescopic column 14; a tensioning rope 18 is fixedly connected between the side of the fork wall 8 away from the mounting block 6 and the connecting plate 17; pulleys 19 are arranged at the turning points of the tensioning rope 18. When the telescopic column 14 extends upward, it can drive a pair of tensioning ropes 18 to move upward synchronously through the connecting plate 17. Then, the lower ends of the tensioning ropes 18 drive the fork walls 8 to slide horizontally on the surface of the guide post 7, so as to prompt the pair of fork walls 8 to approach each other and clamp the middle part of the steel member, locking and fixing the lifting tool 2 and the member, and preventing accidental separation between the lifting tool 2 and the member during the lifting process.
[0044] It should be noted that this embodiment is only applicable to members with a middle beam in the cross-sectional shape such as H-shaped steel and I-shaped steel.
[0045] As another embodiment of the present invention, a group of anti-slip bumps 20 are evenly distributed on the upper side surface of the fork wall 8, and the anti-slip bumps 20 have a certain elasticity. After the fork wall 8 is attached to the steel member, the anti-slip bumps 20 can be used to increase the frictional damping between the two, thereby preventing accidental sliding between the fork wall 8 and the member during hoisting, which may cause the member to slip, and further improving the safety factor.
[0046] As another embodiment of the present invention, a sliding seal connection is provided between the piston 13 and the inclined cylinder 12; an air groove 21 is opened inside the fork wall 8; a hose 22 is connected between the air groove 21 and the bottom of the inclined cylinder 12; a group of guide holes 23 are evenly distributed between the upper side of the fork wall 8 and the air groove 21.
[0047] When the telescopic column 14 drives the piston 13 to move upward inside the inclined cylinder 12, negative pressure is generated inside the bottom of the inclined cylinder 12, and air is sucked into the bottom of the inclined cylinder 12. When the steel member is hoisted to the designated position, the steel wire rope 3 is relaxed. At this time, the buffer spring 15 drives the telescopic column 14 and the piston 13 to reset downward inside the inclined cylinder 12, so that the air inside the bottom of the inclined cylinder 12 is compressed and then squeezed into the air groove 21 of the fork wall 8 through the hose 22, and finally sprayed upward through a plurality of guide holes 23. Since the surface of the steel member may have substances such as dust, mud, rust, and scale due to its own or construction site reasons, etc., these substances are likely to remain on the surface of the fork wall 8 after the fork wall 8 contacts the steel member. At this time, jetting air through the guide holes 23 can blow away the residues on the surface of the fork wall 8, keeping the upper side surface clean, thereby preventing the residual substances from reducing the contact effect and anti-slip effect between the fork wall 8 and the member.
[0048] A group of bent holes 24 are opened inside the anti-slip bump 20, and the outer end of the bent hole 24 is inclined downward; the bent hole 24 is in communication with the guide hole 23. When some of the guide holes 23 jet air, the air flow can spray out along the bent holes 24 inside the anti-slip bump 20. And because the outer end of the bent hole 24 is inclined downward, it can guide the air flow. Therefore, when the air flow sprays out, it can directly impact between adjacent anti-slip bumps 20 and the surface of the fork wall 8, thereby improving the wiping effect on the fork wall 8 and increasing the acting area of the air flow.
[0049] The bottom of the inclined cylinder 12 is communicated with an air inlet 25; check valves are arranged inside both the air inlet 25 and the hose 22. By providing the air inlet 25 and the check valves, when the piston 13 moves downward, the check valve of the air inlet 25 is in a closed state, and the check valve of the hose 22 is in a conducting state. Therefore, the air inside the bottom of the inclined cylinder 12 is discharged through the hose 22 to clean the surface of the fork wall 8. When the piston 13 moves upward, the check valve of the air inlet 25 is in a conducting state, and the check valve of the hose 22 is in a closed state. Therefore, the air outside can be re-sucked into the bottom of the inclined cylinder 12 through the air inlet 25, and such a working cycle is formed, enabling the guide hole 23 to only function as an air outlet, avoiding the problem that impurities on the surface of the fork wall 8 are sucked into the air path structure during suction, resulting in blockage.
[0050] As another embodiment of the present invention, chutes 26 are respectively opened at the corresponding positions of the bottom of the suspension seat 1 for the steel wire ropes 3; sliders 27 are slidably connected inside the chutes 26; compression springs 28 are fixedly connected between the sliders 27 and the chutes 26; a coating roller 29 is rotatably connected to the bottom of the sliders 27;
[0051] A cavity 30 is formed inside the suspension seat 1, and the cavity 30 is used to store a curing liquid. The curing liquid is preferably a penetrant lubricant with good fluidity, synthetic grease, petroleum-based grease, etc.; a transmission strip 31 is arranged inside the cavity 30; the other end of the transmission strip 31 is fixedly connected to the inside of the slider 27, and the end of the transmission strip 31 is in contact with the coating roller 29; both the coating roller 29 and the transmission strip 31 are made of water-absorbing materials.
[0052] When the pair of steel wire ropes 3 are working, they are in an open and taut state. At this time, the steel wire ropes 3 can contact the coating roller 29, and with different opening angles, the sliders 27 and the coating roller 29 can be automatically adjusted up and down in cooperation with the compression spring 28. The transmission strip 31 can continuously conduct the curing liquid inside the cavity 30 to the inside of the coating roller 29 by means of capillary penetration. Then, when the winch 5 drives the steel wire ropes 3 to move, the coating roller 29 can roll on the surface of the steel wire ropes 3 and apply the curing liquid to the surface of the steel wire ropes 3. The curing liquid gradually flows downward along the top of the steel wire ropes 3, thereby realizing the function of automatically applying the curing liquid to the steel wire ropes 3, forming a protective film layer on their surfaces, reducing phenomena such as wear, corrosion, rust, and fatigue during use, and extending the service life of the steel wire ropes 3 without the need for manual regular application.
[0053] As another embodiment of the present invention, a separation cup 32 is fixedly connected to the bottom of the steel wire rope 3; a storage block 33 is arranged inside the separation cup 32; the storage block 33 is made of a water-absorbing material. When the curing liquid on the surface of the steel wire rope 3 flows downward to the bottom of the steel wire rope 3, it will be blocked by the separation cup 32, so that the excess curing liquid is stored inside the separation cup 32, preventing the curing liquid from flowing onto the spreader 2 and causing slippage between it and the component. By arranging the storage block 33 to adsorb and fix the curing liquid collected inside the separation cup 32, it is possible to prevent the curing liquid from splashing out of the separation cup 32 under the action of shaking. When the storage block 33 is full, the separation cup 32 is inverted regularly, and the storage block 33 is squeezed from the opening of the separation cup 32 to squeeze out the curing liquid.
[0054] The above front, back, left, right, up, and down are all based on the Figure 1 in the accompanying drawings of the specification. Taking the observation perspective of a person as the standard, the side of the device facing the observer is defined as the front, and the left side of the observer is defined as the left, and so on.
[0055] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of the present invention.
[0056] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.
Claims
1. A hoisting construction device for a steel structure workshop, comprising a lifting seat (1), a lifting tool (2) and a steel wire rope (3); a pair of the lifting tools (2) and the steel wire ropes (3) are provided. It is characterized in that: A pair of driving mechanisms (4) are fixedly connected to the surface of the lifting seat (1); a pair of winches (5) are rotatably connected to the bottom of the lifting seat (1), and the winches (5) are respectively controlled to rotate by the driving mechanisms (4); a pair of the steel wire ropes (3) are respectively connected between the winches (5) and the lifting tools (2). The lifting tool (2) is used to cooperate with the steel structure; a pair of mounting blocks (6) are fixedly connected to the side surface of the lifting tool (2); a guide post (7) is fixedly connected between the mounting blocks (6); a pair of fork walls (8) are slidably connected to the surface of the guide post (7). An inclined cylinder (12) is fixedly connected to the top of the lifting tool (2); a piston (13) is slidably connected inside the inclined cylinder (12); a telescopic column (14) is fixedly connected to the upper side of the piston (13); a buffer spring (15) is fixedly connected between the piston (13) and the inclined cylinder (12); one end of the telescopic column (14) extending outside the inclined cylinder (12) is connected to the steel wire rope (3). A sliding seal connection is provided between the piston (13) and the inclined cylinder (12); an air groove (21) is formed inside the fork wall (8); a hose (22) communicates between the air groove (21) and the bottom of the inclined cylinder (12); a group of guide holes (23) are evenly distributed between the upper side of the fork wall (8) and the air groove (21).
2. The hoisting construction device for a steel structure workshop according to claim 1, wherein: A guide rod (9) is fixedly connected to the bottom of the lifting tool (2); a pair of movable rings (10) are slidably connected to the surface of the guide rod (9); support ribs (11) are respectively fixedly connected between the movable rings (10) and the fork walls (8).
3. The hoisting construction device for a steel structure workshop according to claim 2, characterized in that: Return springs (16) are respectively fixedly connected between the fork walls (8) and the mounting blocks (6); a connecting plate (17) is fixedly connected to the top of the telescopic column (14); a tensioning rope (18) is fixedly connected between the side of the fork wall (8) away from the mounting block (6) and the connecting plate (17); pulleys (19) are provided at the turning points of the tensioning rope (18).
4. The hoisting construction device for a steel structure factory building according to claim 3, wherein: A group of anti-slip convex points (20) are evenly distributed on the upper side surface of the fork wall (8).
5. The hoisting construction device for a steel structure workshop according to claim 4, characterized in that: A group of bent holes (24) are formed inside the anti-slip convex points (20), and the outer ends of the bent holes (24) are inclined downward; the bent holes (24) communicate with the guide holes (23).
6. The hoisting construction device for a steel structure workshop according to claim 5, wherein: An air inlet (25) is communicated with the bottom of the inclined cylinder (12); check valves are provided inside both the air inlet (25) and the hose (22).
7. A hoisting construction device for a steel structure workshop according to claim 1, characterized in that: Chutes (26) are respectively formed at the positions corresponding to the steel wire ropes (3) at the bottom of the lifting seat (1); sliders (27) are slidably connected inside the chutes (26); compression springs (28) are fixedly connected between the sliders (27) and the chutes (26); coating rollers (29) are rotatably connected to the bottoms of the sliders (27). A receiving cavity (30) is formed inside the hanging seat (1); a transmission strip (31) is arranged inside the receiving cavity (30); the other end of the transmission strip (31) is fixedly connected to the inside of the slider (27), and the end of the transmission strip (31) is attached to the coating roller (29); both the coating roller (29) and the transmission strip (31) are made of water-absorbing materials.
8. The hoisting construction device for a steel structure workshop according to claim 7, characterized in that: An isolation cup (32) is fixedly connected to the bottom of the steel wire rope (3); a storage block (33) is arranged inside the isolation cup (32); the storage block (33) is made of water-absorbing materials.
Citation Information
Patent Citations
Steel structure hoisting device for workshop construction
CN119079839A
Lifting hook tackle
CN110228750A
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CN117945255A
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CN118790860A
Special hoist and mount combination rigging of I -steel
CN205241044U
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