Super-long reinforcement cage hoisting hoist

Abstract

The application provides a super-long steel reinforcement cage hoisting hoist, which comprises a plurality of embracing rings, a first end embracing ring, a second end embracing ring and intermediate embracing rings which are sleeved on the outside of the steel reinforcement cage, the first end embracing ring and the second end embracing ring are respectively arranged at the two ends of the steel reinforcement cage, the intermediate embracing rings are one or more, the intermediate embracing rings are arranged between the first end embracing ring and the second end embracing ring, the hoist further comprises a main hoisting arm and an auxiliary hoisting arm, the main hoisting arm is provided with a first sling, the first sling is hoisted on the first end embracing ring, the auxiliary hoisting arm is provided with at least two second slings, the lower ends of the two second slings are provided with a main trolley, and a third sling is further arranged, one end of the third sling is hoisted on the intermediate embracing ring, and the other end of the third sling is hoisted on the second end embracing ring by passing through the main trolley, so that the problem of preventing deformation during hoisting of the super-long steel reinforcement cage is solved.

Description

Technical Field

[0001] This invention relates to the field of steel cage hoisting, and in particular to a hoisting tool for ultra-long steel cages. Background Technology

[0002] Extra-long steel cages are commonly used in large-scale projects such as bridges, tunnels, subways, and high-rise buildings. They are an important means of reinforcing concrete structures by weaving steel bars into a cage-like structure according to certain shapes and sizes.

[0003] Extra-long steel cages are typically installed into pre-excavated pits or holes using a hoisting method. During hoisting, at least two crane booms are usually used to lift both ends and adjust the cage's posture in the air. Due to the considerable length of the extra-long steel cage, its middle section will naturally bend under gravity during lateral hoisting, causing deformation. Summary of the Invention

[0004] This invention provides a lifting tool for ultra-long steel cages, which solves the problem of preventing deformation during the lifting of ultra-long steel cages.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an ultra-long steel cage hoisting device, comprising multiple clamps, wherein the clamps are sleeved on the outside of the steel cage, including a first end clamp, a second end clamp, and a middle clamp. The first end clamp and the second end clamp are respectively located at both ends of the steel cage, and there are one or more middle clamps located between the first end clamp and the second end clamp. The device also includes a main boom and an auxiliary boom. The main boom is provided with a first sling, which is suspended from the first end clamp. The auxiliary boom is provided with at least two second slings, and the lower ends of the two second slings are provided with a main pulley. A third sling is also provided, one end of which is suspended from the middle clamp, and the other end of which passes around the main pulley to suspend the second end clamp.

[0006] In the preferred embodiment, a secondary pulley and a fourth sling are also provided. The intermediate clamp includes a first intermediate clamp and a second intermediate clamp. One end of the third sling is connected to the first intermediate clamp, and the other end of the third sling passes around the main pulley to connect to the secondary pulley. One end of the fourth sling is connected to the second intermediate clamp, and the other end of the fourth sling passes around the secondary pulley to connect to the second intermediate clamp.

[0007] In the preferred embodiment, the retaining ring includes a semi-circular arc-shaped support plate and a second sliding cavity. The arc-shaped support plate and the second sliding cavity are joined together to form a ring. The arc-shaped support plate is located below the arc-shaped cover. Lifting lugs are provided at both ends of the arc-shaped support plate. A friction sleeve is provided on the inner side of the arc-shaped support plate, and the friction sleeve is tightly attached to the reinforcing cage.

[0008] In a preferred embodiment, the arc-shaped support plate has a second sliding cavity, and a slidable pull block is provided inside the second sliding cavity. The arc-shaped support plate also has a lifting frame, and one side of the lifting frame has multiple stop pins. One end of the stop pin passes through the arc-shaped support plate and protrudes from the inner side of the arc-shaped support plate. The other side of the lifting frame has a first guide rod, and the arc-shaped support plate has a first sliding cavity. The first guide rod is slidably inserted into the first sliding cavity. The arc-shaped support plate has a first spring, one end of which abuts against the lifting frame. It also has a fixed pulley and a connecting cable. One end of the connecting cable is connected to the lifting frame, and the other end of the connecting cable passes around the fixed pulley to connect with the pull block. The lower middle part of the arc-shaped support plate has a rotatable winding cylinder, and a pull cable is also provided. One end of the pull cable is connected to the pull block, and the other end of the pull cable is wound on the winding cylinder of the adjacent arc-shaped support plate.

[0009] In a preferred embodiment, a rotatable drive shaft is provided on the arc-shaped support plate, and a winding cylinder is sleeved on the outside of the drive shaft. A rotatable first transmission wheel is provided inside the arc-shaped support plate at one end of the winding cylinder. The first transmission wheel is connected to the end of the drive shaft. A second transmission wheel and a third transmission wheel that drive the first transmission wheel are respectively provided on both sides of the first transmission wheel. The ends of two adjacent arc-shaped support plates are attached together so that the second transmission wheel drives the adjacent third transmission wheel.

[0010] In a preferred embodiment, a lifting plate is located on the side of the first drive wheel away from the winding drum. A pin is provided on one side of the lifting plate, and a side insertion hole is provided on the side of the winding drum. The pin passes through the first drive wheel to slidably engage with the side insertion hole. A pin part is provided on the other side of the lifting plate. A slidable slide block is provided inside the arc-shaped support plate. The slide block is also provided with a pin clearance hole. A second spring is provided inside the arc-shaped support plate. The second spring abuts against one end of the slide block, and a top rod is provided at the other end of the slide block. A third spring is also provided inside the arc-shaped support plate. One end of the third spring abuts against the lifting plate. Adjacent arc-shaped support plates press the top rod to cause the slide block to move laterally. The pin part is inserted into the pin clearance hole to disengage the pin from the side insertion hole.

[0011] In the preferred embodiment, one end of the arc-shaped support plate is provided with a guide slope, and a positioning hole is provided at the guide slope. The other end of the arc-shaped support plate is provided with a retractable positioning pin, which is used to insert into the positioning hole. One end of the positioning pin is provided with a fourth spring that abuts against the arc-shaped support plate.

[0012] In the preferred embodiment, one end of the positioning pin is provided with an unlocking lever, and a fourth spring is sleeved on the outside of the unlocking lever, with the unlocking lever protruding from the arc-shaped support plate.

[0013] In the preferred embodiment, the winding drum is provided with a first side plate and a second side plate. The first side plate is rotatably connected to the arc-shaped support plate, and the drive shaft is rotatably sleeved with the first side plate. The first side plate is provided with an annular groove, and the arc-shaped support plate is provided with a locking pin, which is locked in the annular groove.

[0014] The beneficial effects of this invention are as follows: Multiple lifting points are extended using main and auxiliary pulleys and lifting slings to lift the middle of the reinforcing cage, preventing central deformation; a clamping device with an arc-shaped support plate is used to lift the reinforcing cage, allowing simultaneous surface contact with multiple reinforcing bars to prevent lifting point deformation; the arc-shaped support plate has friction sleeves and stop pins to effectively prevent slippage of the lifting points during hoisting; a drive motor can be installed on the second-end clamping ring, using a cable to pull the middle clamping ring towards the second-end clamping ring, automatically retracting the middle clamping ring and changing its position, avoiding frequent interruptions and disassembly of the clamping ring during the lowering of the reinforcing cage; a relay-style retraction and retraction is used, with each retraction and retraction process only pulling one arc-shaped support plate, and the drive motor only bearing the frictional resistance of one arc-shaped support plate, avoiding the accumulation of frictional resistance that could cause the resistance to exceed the driving force. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a front view of the lifting mechanism of the present invention.

[0017] Figure 2 This is a side view of the lifting mechanism of the present invention.

[0018] Figure 3 This is a schematic diagram of the relay pull-up arc-shaped support plate of the present invention.

[0019] Figure 4 This is a cross-sectional view of the arc-shaped support plate of the present invention.

[0020] Figure 5 This is a top view of the lifting frame of the present invention.

[0021] Figure 6 This is a partial cross-sectional view of the lifting frame of the present invention.

[0022] Figure 7 This is a schematic diagram of the connection between adjacent arc-shaped trays of the present invention.

[0023] Figure 8 This is a partial cross-sectional view of the lifting plate of the present invention.

[0024] In the diagram: First end clamp 1; Arc-shaped support plate 101; Stop pin 102; First sliding cavity 103; Second sliding cavity 104; Second end clamp 2; Middle clamp 3; First middle clamp 301; Second middle clamp 302; Arc-shaped cover 4; Friction sleeve 401; Main boom 5; Auxiliary boom 6; First main trolley 601; Second main trolley 602; First auxiliary trolley 603; Second auxiliary trolley 604; Lifting frame 7; First guide rod 701; Intermediate connecting plate 702; First spring 703; Fixed pulley 704; Pull block 705; Connecting cable 706; Cable 70 7; Winding drum; Drive shaft; First transmission wheel; Second transmission wheel; Third transmission wheel; Second guide rod; Lifting plate; Pin rod; Sliding block; Pin clearance hole; Pin part; Second spring; Third spring; Side insertion hole; Unlocking hole; First side plate; Second side plate; Ring groove; Locking pin; Top rod; Guide slope; Positioning hole; Positioning pin; Fourth spring; Unlocking lever; 905. Detailed Implementation

[0025] like Figure 1-8 A lifting device for an ultra-long steel cage includes multiple clamps. The clamps are fitted around a first end clamp 1, a second end clamp 2, and a middle clamp 3 on the outside of the steel cage. The first end clamp 1 and the second end clamp 2 are respectively located at both ends of the steel cage. There are one or more middle clamps 3, which are located between the first end clamp 1 and the second end clamp 2. The device also includes a main boom 5 and an auxiliary boom 6. The main boom 5 is equipped with a first sling, which is suspended from the first end clamp 1. The auxiliary boom 6 is equipped with at least two second slings. The lower ends of the two second slings are equipped with a main pulley, i.e., a pulley device. A third sling is also provided. One end of the third sling is suspended from the middle clamp 3, and the other end of the third sling passes around the main pulley to suspend the second end clamp 2.

[0026] In the preferred embodiment, a secondary pulley and a fourth sling are also provided. The intermediate sling 3 includes a first intermediate sling 301 and a second intermediate sling 302. One end of the third sling is connected to the first intermediate sling 301, and the other end of the third sling passes around the main pulley to connect to the secondary pulley. One end of the fourth sling is connected to the second intermediate sling 302, and the other end of the fourth sling passes around the secondary pulley to connect to the second intermediate sling 2.

[0027] The main pulley includes a first main pulley 601 and a second main pulley 602, and the auxiliary pulley includes a first auxiliary pulley 603 and a second auxiliary pulley 604. The first, second, third and fourth slings are all at least two in number, which are respectively connected to the two sides of the first end ring 1, the second end ring 2 and the middle ring 3 to ensure the balance of the sling.

[0028] The main boom 5 lifts the lower end of the reinforcing cage. When the reinforcing cage is lifted horizontally, the first end clamp 1, the second end clamp 2, and the middle clamp 3 are evenly distributed along the length of the reinforcing cage to prevent it from bending. When it approaches the borehole, the main boom 5 lowers and the auxiliary boom 6 rises, and the reinforcing cage gradually becomes more vertical. The first end clamp 1 is then removed, and the lower end of the reinforcing cage begins to enter the borehole. As the reinforcing cage is lowered, the middle clamp 3 is gradually removed, and finally the second end clamp 2 is removed.

[0029] In the preferred embodiment, the retaining ring includes a semi-circular arc-shaped support plate 101 and a second sliding cavity 104. The arc-shaped support plate 101 and the second sliding cavity 104 are joined together to form a ring. The arc-shaped support plate 101 is located below the arc-shaped cover 4. The arc-shaped support plate 101 has lifting lugs at both ends. The inner side of the arc-shaped support plate 101 is provided with a friction sleeve 401, which is tightly attached to the reinforcing cage.

[0030] During hoisting, the friction sleeve 401 is tightly fitted against the reinforcing steel hoop on the outer ring of the reinforcing steel cage, providing a certain amount of friction to prevent the retaining ring from slipping. The second sliding cavity 104 does not need to contact the reinforcing steel cage, avoiding localized deformation of the reinforcing steel cage.

[0031] In a preferred embodiment, the arc-shaped support plate 101 is provided with a second sliding cavity 104, and a slidable pull block 705 is provided within the second sliding cavity 104. The arc-shaped support plate 101 is also provided with a lifting frame 7. Multiple stop pins 102 are provided on one side of the lifting frame 7, with one end of each stop pin 102 passing through the arc-shaped support plate 101 and protruding from the inner side of the arc-shaped support plate 101. A first guide rod 701 is provided on the other side of the lifting frame 7. A first sliding cavity 103 is provided within the arc-shaped support plate 101, and the first guide rod 701 is slidably inserted into the first sliding cavity 103. The pallet 101 is provided with a first spring 703, one end of which abuts against the lifting frame 7. It is also provided with a fixed pulley 704 and a connecting cable 706. One end of the connecting cable 706 is connected to the lifting frame 7, and the other end of the connecting cable 706 passes around the fixed pulley 704 to connect with the pull block 705. The lower middle part of the arc-shaped pallet 101 is provided with a rotatable winding cylinder 8 and a pull cable 707. One end of the pull cable 707 is connected to the pull block 705, and the other end of the pull cable 707 is wound on the winding cylinder 8 of the adjacent arc-shaped pallet 101.

[0032] The lifting frame 7 is H-shaped. The lifting frame 7 has at least four corner stop pins 102. The lifting frame 7 has two horizontal plates. The stop pins 102 are located at the ends of the horizontal plates. The middle connecting plate 702 is located in the middle to connect the two horizontal plates. The connecting cable 706 connects the middle of the lower end face of the middle connecting plate 702.

[0033] The fixed pulley 704 is connected to the lower end of the arc-shaped support plate 101 through the connecting frame. The fixed pulley 704 plays a steering role for the connecting cable 706. The two ends of the second sliding cavity 104 are narrow to prevent the pull block 705 from coming out.

[0034] Because the friction of the friction sleeve 401 is limited, when the steel cage is horizontal, each stop pin 102 is inserted into the hollow part of the side wall of the steel cage and is stopped by the steel ring, which plays a role in preventing slippage.

[0035] The winding drum 8 of the arc-shaped support plate 101 of the second end ring 2 can be driven to rotate by a motor. When the steel cage is tilted or close to vertical, the winding drum 8 rotates to wind the cable 707 and pulls the pull block 705 to slide. The pull block 705 pulls the connecting cable 706. The connecting cable 706 passes through the small hole of the arc-shaped support plate 101 and connects to the intermediate connecting plate 702. When the lifting frame 7 is pulled, the second end ring 2 retracts into the arc-shaped support plate 101. At the same time, the lifting frame 7 compresses the first spring 703. At this time, since the component of gravity in the direction of the normal pressure on the friction sleeve 401 is reduced, the friction is reduced. The adjacent arc-shaped support plates 101 can be pulled and move closer to the arc-shaped support plate 101 of the second end ring 2. When the two arc-shaped support plates 101 are close, the pull block 705 can be stopped. The stop pin 102 springs back under the elastic force of the first spring 703 and is inserted into the hollow side wall of the steel cage.

[0036] The front end of the stop pin 102 can be chamfered to reduce the probability of hitting the steel bar ring. When the conical surface hits the ring, it can guide itself and push the arc-shaped support plate 101 to move laterally as a whole.

[0037] In a preferred embodiment, the arc-shaped support plate 101 is provided with a rotatable drive shaft 801, and the winding drum 8 is sleeved on the outside of the drive shaft 801. A rotatable first transmission wheel 802 is provided inside the arc-shaped support plate 101 at one end of the winding drum 8. The first transmission wheel 802 is connected to the end of the drive shaft 801. A second transmission wheel 803 and a third transmission wheel 804 are respectively provided on both sides of the first transmission wheel 802, which drive the first transmission wheel 802. The ends of two adjacent arc-shaped support plates 101 are attached together so that the second transmission wheel 803 drives the adjacent third transmission wheel 804.

[0038] The drive shaft 801 is used to install the drive motor, which drives the winding drum 8 to rotate. When the winding drum 8 pulls the cable 707, the stop pin 102 is unlocked, and the adjacent arc-shaped support plate 101 moves closer to the arc-shaped support plate 101. One end of the arc-shaped support plate 101 has an indentation, and the other end has a guide protrusion. When the end faces of the two arc-shaped support plates 101 are in contact and positioned, the third transmission wheel 804 of the front arc-shaped support plate 101 is in contact with the second transmission wheel 803 of the rear arc-shaped support plate 101 and can transmit torque. Therefore, the power of the drive shaft 801 is transmitted to the winding drum 8 of the other arc-shaped support plate 101, and the winding drum 8 can continue to pull the arc-shaped support plate 101 further ahead, and so on.

[0039] The first transmission wheel 802, the second transmission wheel 803, and the third transmission wheel 804 can adopt common transmission forms such as gears or friction wheels.

[0040] In a preferred embodiment, a lifting plate 806 is located on the side of the first drive wheel 802 away from the winding drum 8. A pin 807 is provided on one side of the lifting plate 806, and a side insertion hole 813 is provided on one side of the winding drum 8. The pin 807 passes through the first drive wheel 802 to slidably engage with the side insertion hole 813. A pin portion 810 is provided on the other side of the lifting plate 806. A slidable sliding block 808 is provided inside the arc-shaped support plate 101, and a pin clearance hole 80 is also provided on the sliding block 808. 9. A second spring 811 is provided inside the arc-shaped support plate 101. The second spring 811 abuts against one end of the sliding block 808. The other end of the sliding block 808 is provided with a push rod 9. A third spring 812 is also provided inside the arc-shaped support plate 101. One end of the third spring 812 abuts against the lifting plate 806. The adjacent arc-shaped support plate 101 presses the push rod 9 to make the sliding block 808 move laterally. The pin part 810 is inserted into the pin clearance hole 809 to make the pin rod 807 disengage from the side insertion hole 813.

[0041] The lifting plate 806 is provided with a second guide rod 805, the first transmission wheel 802 is slidably sleeved with the second guide rod 805, and the third spring 812 is sleeved on the outside of the second guide rod 805.

[0042] When the front arc-shaped support plate 101 abuts against the rear arc-shaped support plate 101, it blocks the top rod 9. The sliding block 808 moves laterally so that the pin part 810 can be aligned with the pin clearance hole 809. Under the elastic force of the third spring 812, the lifting plate 806 moves upward, and the pin rod 807 is pulled out from the side insertion hole 813. The winding drum 8 and the first transmission wheel 802, which were originally rotating synchronously, are disengaged. At this time, when the drive motor drives the drive shaft 801 to rotate, only the first transmission wheel 802 follows the rotation, so as to prevent the winding drum 8 from continuing to pull the cable 707 of the front arc-shaped support plate 101 and causing the drive motor to jam.

[0043] The inner side of the arc-shaped support plate 101 is provided with an unlocking hole 814 coaxial with the pin part 810. The inserted pin part 810 can be pushed from here to make it retract. At this time, the pin rod 807 is re-inserted into the side insertion hole 813. Under the push of the second spring 811, the sliding stop 808 moves laterally to block the pin part 810 again.

[0044] In a preferred embodiment, one end of the arc-shaped support plate 101 is provided with a guide slope 901, and a positioning hole 902 is provided at the guide slope 901. The other end of the arc-shaped support plate 101 is provided with a retractable positioning pin 903, which is used to insert into the positioning hole 902. One end of the positioning pin 903 is provided with a fourth spring 904 that abuts against the arc-shaped support plate 101.

[0045] The end of the positioning pin 903 is rounded. When the guide slope 901 of the adjacent arc-shaped support plate 101 presses against the end of the positioning pin 903, the positioning pin 903 presses against the fourth spring 904 and retracts inward. When the guide slope 901 comes into position, the positioning pin 903 aligns with the positioning hole 902. Under the elastic force of the fourth spring 904, the positioning pin 903 is inserted into the positioning hole 902, and the two arc-shaped support plates 101 are then locked.

[0046] In the preferred embodiment, one end of the positioning pin 903 is provided with an unlocking lever 905, and the fourth spring 904 is sleeved on the outside of the unlocking lever 905. The unlocking lever 905 protrudes from the arc-shaped support plate 101.

[0047] Pulling the unlocking lever 905 will cause the positioning pin 903 to retract, thereby unlocking the two adjacent arc-shaped support plates 101.

[0048] In a preferred embodiment, the winding drum 8 is provided with a first side plate 815 and a second side plate 816. The first side plate 815 is rotatably connected to the arc-shaped support plate 101, and the drive shaft 801 is rotatably sleeved with the first side plate 815. The first side plate 815 is provided with an annular groove 817, and the arc-shaped support plate 101 is provided with a locking pin 818, which is locked in the annular groove 817.

[0049] The locking pin 818 only restricts the axial movement of the first side plate 815, but does not restrict its circumferential rotation.

[0050] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A lifting device for ultra-long steel cages, characterized in that: It includes multiple clasps, with a first end clasp (1), a second end clasp (2), and a middle clasp (3) fitted around the outside of the steel cage. The first end clasp (1) and the second end clasp (2) are respectively located at both ends of the steel cage. There are one or more middle clasps (3), which are located between the first end clasp (1) and the second end clasp (2). It also includes a main boom (5) and an auxiliary boom (6). The main boom (5) is equipped with a first sling, which is suspended on the first end clasp (1). The auxiliary boom (6) is equipped with at least two second slings, with a main pulley at the lower end of the two second slings. It is also equipped with a third sling, with one end of the third sling being suspended on the middle clasp (3) and the other end of the third sling passing around the main pulley to suspend the second end clasp (2). The retaining ring includes a semi-circular arc-shaped support plate (101) and a second sliding cavity (104). The arc-shaped support plate (101) is provided with a second sliding cavity (104), and a slidable pull block (705) is provided in the second sliding cavity (104). The arc-shaped support plate (101) is also provided with a lifting frame (7). Multiple stop pins (102) are provided on one side of the lifting frame (7). One end of the stop pin (102) passes through the arc-shaped support plate (101) and protrudes from the inner side of the arc-shaped support plate (101). A first guide rod (701) is provided on the other side of the lifting frame (7). A first sliding cavity (103) is provided in the arc-shaped support plate (101). The first guide rod (701) is slidably inserted into the first sliding cavity (103). The first spring (703) is provided inside the lifting frame (7), one end of the first spring (703) abuts against the lifting frame (7), and a fixed pulley (704) and a connecting cable (706) are also provided. One end of the connecting cable (706) is connected to the lifting frame (7), and the other end of the connecting cable (706) passes around the fixed pulley (704) to connect with the pull block (705). The lower middle part of the arc-shaped support plate (101) is provided with a rotatable winding cylinder (8), and a pull cable (707) is also provided. One end of the pull cable (707) is connected to the pull block (705), and the other end of the pull cable (707) is wound on the winding cylinder (8) of the adjacent arc-shaped support plate (101). A rotatable drive shaft (801) is provided on the arc-shaped support plate (101). The winding drum (8) is sleeved on the outside of the drive shaft (801). A rotatable first transmission wheel (802) is provided inside the arc-shaped support plate (101) at one end of the winding drum (8). The first transmission wheel (802) is connected to the end of the drive shaft (801). A second transmission wheel (803) and a third transmission wheel (804) that drive the first transmission wheel (802) are respectively provided on both sides of the first transmission wheel (802). The ends of two adjacent arc-shaped support plates (101) are attached together so that the second transmission wheel (803) drives the adjacent third transmission wheel (804). On the side of the first drive wheel (802) away from the winding drum (8), there is a lifting plate (806). A pin (807) is provided on one side of the lifting plate (806), and a side insertion hole (813) is provided on one side of the winding drum (8). The pin (807) passes through the first drive wheel (802) to slide into the side insertion hole (813). A pin portion (810) is provided on the other side of the lifting plate (806). A slidable sliding block (808) is provided inside the arc-shaped support plate (101). A pin clearance hole (809) is also provided on the sliding block (808). The tray (101) is provided with a second spring (811), which abuts against one end of the sliding block (808). The other end of the sliding block (808) is provided with a top rod (9). The arc-shaped tray (101) is also provided with a third spring (812), one end of which abuts against the lifting plate (806). The adjacent arc-shaped tray (101) presses the top rod (9) to make the sliding block (808) move laterally. The pin part (810) is inserted into the pin clearance hole (809) to make the pin rod (807) disengage from the side insertion hole (813).

2. The lifting device for ultra-long steel cages according to claim 1, characterized in that: It is also equipped with a secondary pulley and a fourth sling. The intermediate sling (3) includes a first intermediate sling (301) and a second intermediate sling (302). One end of the third sling is connected to the first intermediate sling (301), and the other end of the third sling goes around the main pulley to connect to the secondary pulley. One end of the fourth sling is connected to the second intermediate sling (302), and the other end of the fourth sling goes around the secondary pulley to connect to the second end sling (2).

3. The lifting device for ultra-long steel cages according to claim 2, characterized in that: The arc-shaped support plate (101) and the second sliding cavity (104) are joined together to form a ring. The arc-shaped support plate (101) is located below the arc-shaped cover (4). The arc-shaped support plate (101) has lifting lugs at both ends. The inner side of the arc-shaped support plate (101) is provided with a friction sleeve (401), which is close to the steel cage.

4. The lifting device for ultra-long steel cages according to claim 1, characterized in that: One end of the arc-shaped support plate (101) is also provided with a guide slope (901), and a positioning hole (902) is provided at the guide slope (901). The other end of the arc-shaped support plate (101) is provided with a retractable positioning pin (903). The positioning pin (903) is used to insert into the positioning hole (902). One end of the positioning pin (903) is provided with a fourth spring (904) that abuts against the arc-shaped support plate (101).

5. The lifting device for ultra-long steel cages according to claim 4, characterized in that: The positioning pin (903) has an unlocking lever (905) at one end, and the fourth spring (904) is sleeved on the outside of the unlocking lever (905). The unlocking lever (905) protrudes from the arc-shaped support plate (101).

6. The lifting device for ultra-long steel cages according to claim 1, characterized in that: The winding drum (8) is provided with a first side plate (815) and a second side plate (816). The first side plate (815) is rotatably connected to the arc-shaped support plate (101). The drive shaft (801) is rotatably sleeved with the first side plate (815). The first side plate (815) is provided with an annular groove (817). The arc-shaped support plate (101) is provided with a locking pin (818), which is locked in the annular groove (817).

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