A crane spreader for lifting a steel pipe

Abstract

The application discloses a lifting machine lifting tool for lifting a steel pipe, and belongs to the technical field of cranes, which comprises a main body module and a centrifugal braking module, the main body module comprises a frame plate, the top of the frame plate is fixedly connected with two mounting seats, a winding roller is rotationally connected between the interiors of the two mounting seats, one of the mounting seats is provided with a driving motor, the output shaft of the driving motor is connected with one end of the winding roller, and the inner idle roller, the linking disc, the centrifugal linking assembly, the resistance ring, the auxiliary brake assembly and the resistance assembly are arranged, so that when the rotating speed of the winding roller is too high, the movable centrifugal linking assembly will automatically open the transmission auxiliary brake assembly, thereby realizing the braking operation of the winding roller, avoiding the property loss and the safety hidden danger caused by the falling of goods, and directly responding to the centrifugal force, so that the structure is simple, convenient to operate and easy to maintain.

Description

Technical Field

[0001] This invention relates to the field of crane technology, and more specifically, to a lifting device for lifting steel pipes. Background Technology

[0002] When transporting or installing steel pipes, a crane is needed to lift them.

[0003] According to the search, patent CN219009766U discloses a lifting device for a gantry crane, including a frame, a hanging mechanism for hanging items and easy to disassemble, and a lifting mechanism for enabling the device to lift and lower and stabilize the lifting. The lifting mechanism is installed in the middle of the frame, and the hanging mechanism is installed at the lower end of the lifting mechanism. With the above technical solution, when lifting items, the lifting plate can be limited by the sliding cooperation between the two ends of the lifting plate and the limiting shaft. Through the coordinated use of the lifting equipment and the hanging mechanism, the lifting plate can rise or fall relatively smoothly during lifting, making it less likely for the lifted items to shake or become dislodged.

[0004] Regarding the aforementioned technologies, existing lifting devices typically take the form described above. During use, a motor drives a lifting rope to raise the cargo to a designated height before lowering it. The lifting device is equipped with a braking system to assist in the lifting process, stopping the descending cargo. In the event of motor failure, the braking system can prevent the cargo from falling. However, the braking system is prone to failure under various conditions such as insufficient air pressure, worn brake components, or heavy cargo. Although such situations are only occasional accidents, the falling cargo can cause significant property damage and safety hazards. Therefore, we propose a lifting device for lifting steel pipes. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a lifting device for hoisting steel pipes, employing the following technical solution:

[0006] A lifting device for lifting steel pipes includes a main module and a centrifugal braking module. The main module includes a frame plate, with two mounting seats fixedly connected to the top of the frame plate. A winding roller is rotatably connected between the interiors of the two mounting seats. A drive motor is mounted on one of the mounting seats, and the output shaft of the drive motor is connected to one end of the winding roller. Two lifting steel cables are mounted on the outer surface of the winding roller, and a brake roller is located in the middle of the outer surface of the winding roller. A brake adapted to the brake roller is mounted on the top of the frame plate. The centrifugal braking module... The block includes a hollow frame fixedly connected to the top of the frame plate. An inner hollow rotating roller is rotatably connected inside the hollow frame. A connecting plate is fixedly connected to the other end of the take-up roller rod. The connecting plate is located inside the inner hollow rotating roller. A movable centrifugal connecting assembly is provided between the connecting plate and the inner wall of the inner hollow rotating roller. A resistance ring is fixedly connected to one side of the inner hollow rotating roller. An auxiliary braking assembly is provided between the top of the frame plate and the outer surface of the take-up roller rod. The auxiliary braking assembly is connected to one side of the resistance ring. A resistance assembly is provided between the outer surface of the hollow frame and the outer surface of the resistance ring.

[0007] Furthermore, the auxiliary braking assembly includes two fixed seats, each fixedly connected to the top of the frame plate. A bidirectional lead screw is rotatably connected inside each of the two fixed seats, with adjacent ends of the two bidirectional lead screws connected to each other. A limiting groove is formed on the top of the frame plate, and four brake plates are slidably connected inside the limiting groove. The four brake plates are threadedly connected to the outer surfaces of the two bidirectional lead screws, and a brake pad is fixedly connected to the adjacent side of each pair of bidirectional lead screws. Two brake discs are fixedly connected to the outer surface of the take-up roller, with the two brake discs located between the two brake pads.

[0008] Furthermore, the auxiliary braking assembly also includes a driven gear fixedly connected to the other end of one of the bidirectional lead screws, and a driving gear is fixedly connected to one side of the resistance ring, the driving gear meshing with the outer surface of the driven gear.

[0009] Furthermore, the movable centrifugal connecting assembly includes a ratchet groove formed on the inner wall of the inner idler roller, and multiple limiting mounting grooves formed on the outer surface of the connecting disc. Each of the four limiting mounting grooves has a ratchet block movably connected inside. One end of each of the four ratchet blocks is adapted to the inner wall of the ratchet groove. Each of the four limiting mounting grooves has a fixed plate fixedly connected inside. The other end of each of the four ratchet blocks is fixedly connected to a first magnetic block and a first spring. The four first magnetic blocks pass through the four fixed plates respectively, and one end of each of the four first springs is fixedly connected to the four fixed plates respectively. Each of the four limiting mounting grooves has a second magnetic block movably connected inside, and the four second magnetic blocks are magnetically connected to the four first magnetic blocks respectively.

[0010] Furthermore, the movable centrifugal connecting assembly also includes four pull plates, which are respectively fixedly connected to four ratchet blocks. Connecting arms are hinged to the outer surfaces of the four second magnetic blocks, and the four connecting arms and the four pull plates extend to the outside of the four limiting mounting slots.

[0011] Furthermore, the movable centrifugal connecting assembly also includes a threaded sleeve rotatably connected to one side of the connecting disc. The threaded sleeve has a first threaded rod internally threaded, and one end of the first threaded rod is fixedly connected to a connecting block. One end of each of the four connecting arms is hinged to the outer surface of the connecting block.

[0012] Furthermore, the resistance assembly includes multiple lifting slots, each opened inside the hollow frame. Each of the multiple lifting slots has a lifting plate slidably connected inside it. Each of the multiple lifting plates has a square rod movably connected inside it. One end of each of the multiple square rods is fixedly connected to a resistance plate. The outer surfaces of each of the multiple resistance plates are in contact with the outer surface of a resistance ring. Each of the multiple lifting plates has a second spring fixedly connected to it. One end of each of the multiple second springs is fixedly connected to the outer surface of the multiple resistance plates. The multiple second springs are located outside the multiple square rods.

[0013] Furthermore, the resistance assembly also includes a plurality of second screws rotatably connected inside a plurality of lifting slots, each of the outer surfaces of the plurality of second screws being fixedly connected with a bevel gear, and the outer surfaces of the plurality of second screws being threadedly connected to the inner surfaces of the plurality of lifting plates.

[0014] Furthermore, the resistance assembly also includes a conical gear ring, which is rotatably connected to one side of the hollow frame, and the outer surface of the hollow frame meshes with the outer surfaces of a plurality of conical gears.

[0015] Furthermore, the main module includes multiple mounting plates, all of which are fixedly connected to the frame plate, and each of the mounting plates has mounting holes inside.

[0016] In summary, the present invention has the following beneficial technical effects:

[0017] (1) By setting up an inner empty rotating roller, a connecting plate, a centrifugal connecting component, a resistance ring, an auxiliary braking component, and a resistance component, the present invention enables the movable centrifugal connecting component to automatically open the transmission auxiliary braking component when the winding roller rotates too fast, thereby realizing the braking operation of the winding roller, avoiding the property damage and safety hazards caused by the falling of goods. This braking method utilizes centrifugal force, and the response is more direct. At the same time, the structure is simple, convenient to operate, and easy to maintain.

[0018] (2) The present invention, through the setting of threaded sleeve, first threaded rod, connecting arm and second magnetic block, makes it possible to change the threshold value of ratchet block triggering, so that the triggering conditions can be adjusted, which facilitates the use of the device and makes it easier for staff to operate according to their needs.

[0019] (3) The present invention, through the setting of conical toothed ring, conical gear, first magnetic block and second spring, can increase the resistance when the resistance ring rotates, assist the subsequent braking operation, and the resistance can be adjusted as needed. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the internal air-rotating roller structure of the present invention;

[0022] Figure 3 This is an exploded structural diagram of the auxiliary braking component of the present invention;

[0023] Figure 4 For the present invention Figure 3 A magnified structural diagram at point A;

[0024] Figure 5 This is an exploded structural diagram of the centrifugal connection assembly of the present invention;

[0025] Figure 6 This is an exploded cross-sectional view of the centrifugal connection assembly of the present invention;

[0026] Figure 7 For the present invention Figure 6 Enlarged structural diagram at point B.

[0027] Explanation of the labels in the diagram:

[0028] 100. Main module; 110. Frame plate; 120. Mounting base; 130. Take-up roller; 140. Drive motor; 150. Lifting cable; 160. Brake roller; 170. Brake; 180. Mounting plate; 190. Mounting hole;

[0029] 200. Centrifugal braking module; 210. Hollow frame; 220. Inner hollow rotating roller; 230. Connecting disc; 240. Centrifugal connecting assembly; 241. Ratchet groove; 242. Limiting mounting groove; 243. Ratchet block; 244. Fixing plate; 245. First magnetic block; 246. First spring; 247. Second magnetic block; 248. Connecting block; 249. Pull plate; 2410. Connecting arm; 2411. Threaded sleeve; 2412. ... 1. Threaded rod; 250. Resistance ring; 260. Auxiliary braking assembly; 261. Fixed base; 262. Double-acting screw; 263. Brake plate; 264. Brake pad; 265. Brake disc; 266. Driven gear; 267. Drive gear disc; 270. Resistance assembly; 271. Lifting plate; 272. Square rod; 273. Resistance plate; 274. Second spring; 275. Second screw; 276. Bevel gear; 277. Bevel gear ring. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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 the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] The following is in conjunction with the appendix Figure 1-7 The present invention will be described in further detail below.

[0034] Please see Figure 1-7A lifting device for lifting steel pipes includes a main module 100 and a centrifugal braking module 200. The main module 100 includes a frame plate 110, with two mounting seats 120 fixedly connected to the top of the frame plate 110. A winding roller 130 is rotatably connected between the interiors of the two mounting seats 120. A drive motor 140 is mounted on one of the mounting seats 120, and the output shaft of the drive motor 140 is connected to one end of the winding roller 130. Two lifting steel cables 150 are provided on the outer surface of the winding roller 130, and a brake roller 160 is provided in the middle of the outer surface of the winding roller 130. A brake 170 adapted to the brake roller 160 is mounted on the top of the frame plate 110. The centrifugal braking module 200 includes... The system includes a hollow frame 210 fixedly connected to the top of the frame plate 110. An inner hollow roller 220 is rotatably connected inside the hollow frame 210. A connecting plate 230 is fixedly connected to the other end of the take-up roller 130. The connecting plate 230 is located inside the inner hollow roller 220. A movable centrifugal connecting assembly 240 is provided between the connecting plate 230 and the inner wall of the inner hollow roller 220. A resistance ring 250 is fixedly connected to one side of the inner hollow roller 220. An auxiliary braking assembly 260 is provided between the top of the frame plate 110 and the outer surface of the take-up roller 130. The auxiliary braking assembly 260 is connected to one side of the resistance ring 250. A resistance assembly 270 is provided between the outer surface of the hollow frame 210 and the outer surface of the resistance ring 250.

[0035] In use, the drive motor 140 drives the take-up roller 130 to rotate, thereby raising and lowering the hoisting cable 150 to lift the goods. The brake 170, in conjunction with the brake roller 160, stops the hoisting cable 150 during descent. If the drive motor 140 fails to stop the descent, the take-up roller 130 will rotate rapidly. This rapid rotation will cause the movable centrifugal connecting assembly 240 to spring open and connect to the inner idle roller 220. The inner idle roller 220 will then drive the resistance ring 250 to rotate. The resistance ring 250 will be resisted by the resistance assembly 270 during rotation, assisting in subsequent braking. The rotation of the resistance ring 250 will also drive the auxiliary braking assembly 260, which will stop the take-up roller 130, thus preventing the goods from falling and causing property damage and safety hazards. This braking method utilizes centrifugal force, resulting in a more direct response, and its simple structure makes it easy to maintain.

[0036] The auxiliary braking assembly 260 includes two fixed seats 261, both fixedly connected to the top of the frame plate 110. A double-acting lead screw 262 is rotatably connected inside each fixed seat 261, with adjacent ends of the two double-acting lead screws 262 interconnected. A limit groove is formed on the top of the frame plate 110, and four brake plates 263 are slidably connected inside the limit groove. The four brake plates 263 are threadedly connected to the outer surfaces of the two double-acting lead screws 262, and a brake pad 264 is fixedly connected to the adjacent side of each pair of double-acting lead screws 262. Two brake discs 265 are fixedly connected to the outer surface of the take-up roller 130. The two brake discs 265 are located between two brake pads 264. The auxiliary braking assembly 260 also includes a driven gear 266 fixedly connected to the other end of one of the bidirectional lead screws 262. A drive gear 267 is fixedly connected to one side of the resistance ring 250. The drive gear 267 meshes with the outer surface of the driven gear 266. The movable centrifugal connecting assembly 240 includes a ratchet groove 241 formed in the inner wall of the inner idle roller 220. The outer surface of the connecting disc 230... Multiple limiting mounting slots 242 are formed on the surface. Each of the four limiting mounting slots 242 has a ratchet block 243 movably connected inside. One end of each of the four ratchet blocks 243 is adapted to the inner wall of the ratchet groove 241. A fixing plate 244 is fixedly connected inside each of the four limiting mounting slots 242. A first magnetic block 245 and a first spring 246 are fixedly connected to the other end of each of the four ratchet blocks 243. The four first magnetic blocks 245 pass through the four fixing plates 244 respectively, and one end of each of the four first springs 246 is connected to the four fixing plates respectively. The four limiting mounting slots 242 are fixedly connected, and each of the four limiting mounting slots 242 is movably connected to a second magnetic block 247. The four second magnetic blocks 247 are magnetically connected to the four first magnetic blocks 245 respectively. The movable centrifugal connecting assembly 240 also includes four pull plates 249. The four pull plates 249 are fixedly connected to the four ratchet blocks 243 respectively. The outer surfaces of the four second magnetic blocks 247 are hinged with connecting arms 2410. The four connecting arms 2410 and the four pull plates 249 extend to the outside of the four limiting mounting slots 242 respectively.

[0037] When the drive motor 140 fails to stop the brake 170, the take-up roller 130 will rotate rapidly. During this rapid rotation, the ratchet block 243 will be subjected to centrifugal force, causing the first magnetic block 245 to separate from the second magnetic block 247. The first spring 246 pushes the ratchet block 243 into the ratchet groove 241, causing the inner idler roller 220 to drive the resistance ring 250 to rotate. When the resistance ring 250 rotates, it will drive the drive gear 267 to drive the driven gear 266. The driven gear 266 will drive the bidirectional lead screw 262 to rotate. When the bidirectional lead screw 262 rotates, it will drive the two brake plates 263 to move closer to each other. The brake plates 263 will drive the two brake pads 264 to contact the brake disc 265 to stop the vehicle. The auxiliary braking assembly 260 will stop the take-up roller 130, thereby preventing the goods from falling and causing property damage and safety hazards. This braking method utilizes centrifugal force, has a more direct response, and has a simple structure that is easy to maintain.

[0038] The movable centrifugal connecting assembly 240 also includes a threaded sleeve 2411 rotatably connected to one side of the connecting plate 230. The threaded sleeve 2411 has a first threaded rod 2412 internally threaded. One end of the first threaded rod 2412 is fixedly connected to a connecting block 248. One end of each of the four connecting arms 2410 is hinged to the outer surface of the connecting block 248.

[0039] The rotating threaded sleeve 2411 drives the first threaded rod 2412, which in turn moves the connecting block 248. The connecting block 248 then pulls the second magnetic block 247 away from the fixed plate 244 via the connecting arm 2410. The pull plate 249 then pulls the ratchet block 243, which in turn moves the first magnetic block 245, causing the first magnetic block 245 to be magnetically connected to the second magnetic block 247. At this point, the first spring 246 is compressed to a greater extent, and the ratchet block 243 receives a greater thrust. As a result, when the ratchet block 243 is subjected to a smaller centrifugal force, the first magnetic block 245 will separate from the second magnetic block 247. This changes the trigger threshold of the ratchet block 243, allowing the triggering conditions to be adjusted. This facilitates the use of the device and makes it easier for operators to perform operations as needed.

[0040] The resistance assembly 270 includes multiple lifting slots, each formed inside the hollow frame 210. Lifting plates 271 are slidably connected inside each of the lifting slots. Square rods 272 are movably connected inside each of the lifting plates 271. A resistance plate 273 is fixedly connected to one end of each of the square rods 272. The outer surfaces of the resistance plates 273 contact the outer surface of the resistance ring 250. Second springs 274 are fixedly connected to each of the lifting plates 271. One end of each second spring 274 is fixedly connected to the outer surface of the resistance plates 273. The second springs 274 are located outside the square rods 272. The resistance assembly 270 also... The system includes multiple second screws 275 rotatably connected to multiple lifting slots. The outer surfaces of the multiple second screws 275 are fixedly connected to bevel gears 276. The outer surfaces of the multiple second screws 275 are respectively threadedly connected to the inner surfaces of multiple lifting plates 271. The resistance component 270 also includes a bevel gear ring 277, which is rotatably connected to one side of the hollow frame 210. The outer surface of the hollow frame 210 meshes with the outer surfaces of the multiple bevel gears 276. The main module 100 includes multiple mounting plates 180, which are fixedly connected to the frame plate 110. The interior of each mounting plate 180 is provided with mounting holes 190.

[0041] The resistance plate 273 is pressed against the outer surface of the resistance ring 250 by the elastic force of the second spring 274, so that the resistance ring 250 will be resisted by the resistance plate 273 when it rotates, which assists in subsequent braking. By rotating the conical toothed ring 277, the conical toothed ring 277 can drive the conical gear 276 to drive the second screw 275 to rotate, thereby causing the lifting plate 271 to descend. The descent of the lifting plate 271 will compress the second spring 274, thereby increasing the pressure of the second spring 274 on the resistance plate 273, thus increasing the resistance provided by the resistance plate 273 to the resistance ring 250, so that the resistance can be adjusted as needed.

[0042] The implementation principle of this invention is as follows: In use, the drive motor 140 drives the take-up roller 130 to rotate, thereby allowing the lifting cable 150 to lift and lower the goods. The brake 170, in conjunction with the brake roller 160, stops the lifting cable 150 during descent. If the drive motor 140 fails to stop the brake 170, the take-up roller 130 will rotate rapidly. During this rapid rotation, the ratchet block 243 will be subjected to centrifugal force, causing the first magnetic block 245 to separate from the second magnetic block 247. The first spring 246 pushes the ratchet block 243 into the ratchet groove 241, causing the inner idler roller 220 to drive the resistance ring 250 to rotate, thus preventing the resistance ring from rotating. When the force ring 250 rotates, it drives the drive gear 267 to drive the driven gear 266. The driven gear 266 drives the double-acting screw 262 to rotate. When the double-acting screw 262 rotates, it drives the two brake plates 263 to move closer to each other. The brake plates 263 drive the two brake pads 264 to contact the brake disc 265 to stop the vehicle. The auxiliary braking assembly 260 will realize the braking operation of the take-up roller 130, thereby avoiding the fall of goods and causing property damage and safety hazards. This braking method uses centrifugal force, which has a more direct response. At the same time, the structure is simple and easy to maintain. The first threaded rod 2412 can be driven by rotating the threaded sleeve 2411. The first threaded rod 2412 will drive the connecting block. When 248 moves, connecting block 248 will pull the second magnetic block 247 away from the fixed plate 244 via connecting arm 2410. Then, pulling plate 249 will pull ratchet block 243 to move the first magnetic block 245, causing the first magnetic block 245 to be magnetically connected to the second magnetic block 247. At this time, the first spring 246 will be compressed to a greater extent, and the ratchet block 243 will be subjected to a greater thrust. Thus, when the ratchet block 243 is subjected to a smaller centrifugal force, the first magnetic block 245 will separate from the second magnetic block 247, thereby changing the triggering threshold of the ratchet block 243, allowing the triggering conditions to be adjusted, facilitating the use of the device, and making it more convenient for operators. The device requires operation. When the resistance ring 250 rotates, the resistance plate 273 is pressed against the outer surface of the resistance ring 250 by the elastic force of the second spring 274. This causes the resistance ring 250 to be subjected to resistance provided by the resistance plate 273 when rotating, assisting in subsequent braking. By rotating the conical toothed ring 277, the conical toothed ring 277 can drive the conical gear 276 to drive the second screw 275 to rotate, thereby causing the lifting plate 271 to descend. The descent of the lifting plate 271 will compress the second spring 274, thereby increasing the pressure of the second spring 274 on the resistance plate 273, thus increasing the resistance provided by the resistance plate 273 to the resistance ring 250, so that the resistance can be adjusted as needed.

[0043] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A lifting device for lifting steel pipes, comprising a main module (100) and a centrifugal braking module (200), characterized in that: The main module (100) includes a frame plate (110), and two mounting seats (120) are fixedly connected to the top of the frame plate (110). A take-up roller (130) is rotatably connected between the interiors of the two mounting seats (120). A drive motor (140) is provided on one of the mounting seats (120). The output shaft of the drive motor (140) is connected to one end of the take-up roller (130). Two hoisting steel cables (150) are provided on the outer surface of the take-up roller (130). A brake roller (160) is provided in the middle of the outer surface of the take-up roller (130). A brake (170) adapted to the brake roller (160) is installed on the top of the frame plate (110). The centrifugal braking module (200) includes a hollow frame (210) fixedly connected to the top of the frame plate (110). An inner hollow rotating roller (220) is rotatably connected inside the hollow frame (210). A connecting plate (230) is fixedly connected to the other end of the take-up roller (130). The connecting plate (230) is located inside the inner hollow rotating roller (220). A movable centrifugal connecting assembly (240) is provided between the connecting plate (230) and the inner wall of the inner hollow rotating roller (220). A resistance ring (250) is fixedly connected to one side of the inner hollow rotating roller (220). An auxiliary braking assembly (260) is provided between the top of the frame plate (110) and the outer surface of the take-up roller (130). The auxiliary braking assembly (260) is connected to one side of the resistance ring (250). A resistance assembly (270) is provided between the outer surface of the hollow frame (210) and the outer surface of the resistance ring (250). The auxiliary braking assembly (260) includes two fixed seats (261) fixedly connected to the top of the frame plate (110). The two fixed seats (261) are rotatably connected to a double-acting screw (262). The two double-acting screws (262) are connected to each other at adjacent ends. The top of the frame plate (110) is provided with a limit groove. The limit groove is slidably connected to four brake plates (263). The four brake plates (263) are threadedly connected to the outer surfaces of the two double-acting screws (262). A brake pad (264) is fixedly connected to the adjacent side of each pair of double-acting screws (262). The outer surface of the take-up roller (130) is fixedly connected to two brake discs (265). The two brake discs (265) are located between the two brake pads (264). The auxiliary braking assembly (260) also includes a driven gear (266) fixedly connected to the other end of one of the bidirectional lead screws (262), and a drive gear (267) fixedly connected to one side of the resistance ring (250), the drive gear (267) meshing with the outer surface of the driven gear (266); The movable centrifugal connecting assembly (240) includes a ratchet groove (241) formed on the inner wall of the inner idle roller (220). Four limiting mounting grooves (242) are formed on the outer surface of the connecting disc (230). Each of the four limiting mounting grooves (242) has a ratchet block (243) movably connected inside. One end of each of the four ratchet blocks (243) is adapted to the inner wall of the ratchet groove (241). Each of the four limiting mounting grooves (242) has a fixed plate (244) fixedly connected inside. The other end of each ratchet block (243) is fixedly connected to a first magnetic block (245) and a first spring (246). The four first magnetic blocks (245) pass through the four fixed plates (244) respectively. One end of each of the four first springs (246) is fixedly connected to the four fixed plates (244) respectively. The interior of each of the four limiting mounting slots (242) is movably connected to a second magnetic block (247). The four second magnetic blocks (247) are magnetically connected to the four first magnetic blocks (245) respectively.

2. The lifting device for lifting steel pipes according to claim 1, characterized in that: The movable centrifugal connecting assembly (240) also includes four pull plates (249), which are fixedly connected to four ratchet blocks (243) respectively. The outer surfaces of the four second magnetic blocks (247) are all hinged with connecting arms (2410), and the four connecting arms (2410) and the four pull plates (249) extend to the outside of the four limiting mounting slots (242) respectively.

3. A lifting device for lifting steel pipes according to claim 2, characterized in that: The movable centrifugal connecting assembly (240) also includes a threaded sleeve (2411) rotatably connected to one side of the connecting disc (230). The threaded sleeve (2411) is internally threaded with a first threaded rod (2412). One end of the first threaded rod (2412) is fixedly connected to a connecting block (248). One end of each of the four connecting arms (2410) is hinged to the outer surface of the connecting block (248).

4. A lifting device for lifting steel pipes according to claim 3, characterized in that: The resistance assembly (270) includes multiple lifting slots, each opened inside the hollow frame (210). Each of the multiple lifting slots is slidably connected to a lifting plate (271). Each of the multiple lifting plates (271) is movably connected to a square rod (272). One end of each of the multiple square rods (272) is fixedly connected to a resistance plate (273). The outer surface of each of the multiple resistance plates (273) is in contact with the outer surface of the resistance ring (250). Each of the multiple lifting plates (271) is fixedly connected to a second spring (274). One end of each of the multiple second springs (274) is fixedly connected to the outer surface of each of the multiple resistance plates (273). The multiple second springs (274) are located outside the multiple square rods (272).

5. A lifting device for lifting steel pipes according to claim 4, characterized in that: The resistance assembly (270) also includes a plurality of second screws (275) that are rotatably connected inside a plurality of lifting slots. The outer surfaces of the plurality of second screws (275) are fixedly connected with bevel gears (276), and the outer surfaces of the plurality of second screws (275) are respectively threadedly connected to the inner threads of the plurality of lifting plates (271).

6. A lifting device for lifting steel pipes according to claim 5, characterized in that: The resistance assembly (270) also includes a conical gear ring (277) which is rotatably connected to one side of the hollow frame (210), and the outer surface of the hollow frame (210) meshes with the outer surfaces of a plurality of bevel gears (276).

7. A lifting device for lifting steel pipes according to claim 6, characterized in that: The main module (100) includes multiple mounting plates (180), all of which are fixedly connected to the frame plate (110), and each of the multiple mounting plates (180) has mounting holes (190) inside.

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