A hoisting device and its hoisting method

Abstract

This invention relates to the field of hoisting devices and discloses a hoisting device and its hoisting method, which effectively solves the problem that when the weight of the object being hoisted is heavy, the position of the two movable pulleys on both sides is easily offset, resulting in unstable hoisting. The device includes two hoisting fixed platforms, with a connecting platform installed equidistantly between the two platforms. A hoisting adjustment assembly is installed on each hoisting fixed platform. The hoisting adjustment assembly includes two fixing rings symmetrically installed on both sides of the bottom end of the hoisting fixed platform, with a steel wire rope between the two fixing rings. The two ends of the steel wire rope are fixedly connected to the two fixing rings respectively. In this invention, an electromagnet, when energized, generates an attractive force on a magnetic block, thereby pulling a movable plate towards the screw via a movable block. This causes a friction vertical plate to press against the side wall of the friction groove, generating significant frictional resistance between the friction vertical plate and the friction groove, thus pressing and positioning the screw, limiting the downward movement of the screw under force, and improving hoisting stability.

Description

Technical Field

[0001] This invention belongs to the field of hoisting devices, specifically a hoisting device and its hoisting method. Background Technology

[0002] In daily life and production, hoisting and lifting are frequently carried out at midday. During the hoisting of heavy objects, the varying lengths of the objects make it difficult to lift loads of different lengths. According to the patent document with authorization announcement number "CN218809845U" and invention titled "A Building Floor Slab Hoisting Device," the description states that to better adapt to the smooth lifting and lowering of floor slabs of different sizes, a movable pulley is installed on a steel wire rope, and a hook is installed on the movable pulley to facilitate connecting the hoisted load. The device also includes a mounting plate. The connected steel wire rope drives the movable pulley and the fixed pulley to move up and down together; the movable pulley can move up the steel wire rope to adjust the position of the hook, thus meeting the needs of adjusting the position of the hook for floor slabs of different lengths, expanding the application range of the device. It is designed with a lifting component that adjusts the distance between the hook and the mounting plate to further adjust the distance between the hook and the mounting plate to adjust the suspension of floor slabs of different lengths, improving the overall stability of the hoisted floor slab. It can adapt to the need to adjust for changes in the thickness and length of the hoisted floor slab. However, the following shortcomings still exist:

[0003] Because there are many types of objects to be lifted, such as those made of wood or plastic and lightweight, which can be lifted directly using lifting equipment, heavy objects, such as reinforced concrete slabs, are much heavier. During lifting, the weight can easily generate strong tension on the wire rope, which in turn can generate significant tension on the fixed pulley. This can cause the threaded bushing to rotate under stress, the screw to move downwards under stress, and consequently, the position of the moving pulleys on both sides to shift, making the lifting unstable and even causing the object to come off the hook and be damaged. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a hoisting device and hoisting method, which effectively solves the problem that when the weight of the hoisted object is heavy, the position of the two movable pulleys on both sides is easily offset, resulting in unstable hoisting.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a hoisting device, comprising two hoisting fixing platforms, a connecting platform being installed at equal intervals between the two hoisting fixing platforms, and a hoisting adjustment component being installed on the hoisting fixing platforms;

[0006] The hoisting adjustment assembly includes two fixed rings symmetrically installed on both sides of the bottom of the hoisting platform. A steel wire rope is installed between the two fixed rings, with each end of the steel wire rope fixedly connected to one of the two fixed rings. Three movable pulleys are installed on the steel wire rope, and the steel wire rope contacts the bottom wall of the rollers on the movable pulleys. Hooks are installed at the bottom of the movable pulleys. Fixed pulleys are installed between two adjacent movable pulleys, and the steel wire rope contacts the top wall of the rollers on the fixed pulleys. The hoisting platform has symmetrically opened rotating grooves, and a screw is installed at the top of the fixed pulley. An adjusting screw sleeve is threaded to the outside of the screw and is rotatably installed in the inner part of the rotating groove. The top and bottom of the rotating groove are symmetrically equipped with limit plates. The two limit plates contact the top wall and bottom wall of the hoisting platform, respectively. The top of the screw is equipped with a top horizontal plate. Two mounting plates are symmetrically arranged above the hoisting platform. The two mounting plates are located above the two top horizontal plates. Two guide support rods are symmetrically installed at the bottom of the mounting plates. The guide support rods are fixedly installed at the top of the hoisting platform. A guide groove is opened on the top horizontal plate. One of the guide support rods on the mounting plate is slidably connected to the guide groove. A fixed pulley positioning assembly is installed on the mounting plate.

[0007] A central groove is provided between the two rotating grooves. An installation shaft is installed in the middle of the central groove. Two second pulleys are symmetrically installed on the installation shaft. Two first pulleys are installed on two adjusting screw sleeves respectively. The two first pulleys are flush with the two second pulleys on the installation shaft. Synchronous belts are installed on the outer sides of the two second pulleys on the installation shaft and the two first pulleys respectively. The installation shaft is fixedly connected to the output shaft of the motor. The motor is fixedly installed at the top center of the hoisting platform.

[0008] The fixed pulley positioning assembly includes a groove inside the mounting plate, extending to the bottom of the mounting plate. A friction groove is provided on the top horizontal plate, located below the groove and on the side of the screw away from the guide groove. A slider is slidably installed inside the groove. An auxiliary limiting unit is installed at the top of the slider. A movable plate is installed at the bottom of the slider, and a screw sleeve limiting unit is installed at the bottom of the movable plate. The movable plate is located inside the friction groove. A friction vertical plate is installed on the side of the movable plate near the screw. A fixed box is provided on the side of the movable plate near the friction vertical plate. The fixed box is fixedly installed on the bottom wall of the mounting plate. A movable block is movably installed inside the fixed box. A pull rod is installed on the side of the movable block near the movable plate. One end of the pull rod extends to the outside of the fixed box and is fixedly connected to the movable plate. A first spring is symmetrically installed on the side of the movable block away from the pull rod. A magnetic block is installed on the side of the movable block away from the pull rod. An electromagnet is installed on the end of the fixed box away from the movable plate. The electromagnet and the magnetic block are magnetically connected.

[0009] Preferably, the screw sleeve limiting unit includes a movable groove formed inside the bottom end of the movable plate, a movable plate is movably installed inside the movable groove, a pressure rod is installed at the bottom end of the movable plate, the bottom end of the pressure rod extends to the bottom end of the movable plate, a friction block is installed at the bottom end of the pressure rod, two second springs are symmetrically installed at the bottom end of the movable plate, a friction ring is fixedly installed on the outside of the limiting plate above the adjusting screw sleeve, and the friction block is located above the friction ring.

[0010] Preferably, the top of the movable groove is provided with an upper groove, and a first rod groove is provided on the side of the upper groove near the friction vertical plate. A connecting rod is movably installed inside the first rod groove. One end of the connecting rod is fixedly connected to the friction vertical plate, and the other end of the connecting rod is fixedly installed with a movable vertical plate. The movable vertical plate is slidably installed inside the upper groove, and the side of the movable vertical plate near the friction vertical plate is in contact with the inner wall of the upper groove on the side near the friction vertical plate. A rotating rod is provided at the bottom of the movable vertical plate. One end of the rotating rod is hinged to the bottom of the movable vertical plate, and the other end of the rotating rod is hinged to the top of the movable plate on the side away from the friction vertical plate.

[0011] Preferably, the auxiliary limiting unit includes a top groove formed at the top of the slide groove, the top groove extending to the top of the mounting plate, a top plate installed at the top of the slider, the top plate being slidably installed inside the top groove, an inflatable clamping member being provided on the side of the top plate near the fixed box, and a movable pulley positioning assembly being provided on the side of the top plate away from the fixed box.

[0012] Preferably, the inflatable clamping component includes two limiting grooves formed on the top horizontal plate. A limiting airbag is provided inside each limiting groove. The outer wall of the limiting airbag contacts the inner wall of the limiting groove. A first connecting pipe is installed at the top of the limiting airbag, with one end extending through to the top of the mounting plate. A connecting box is installed at the top of the mounting plate. The two first connecting pipes are connected to the connecting box. An inflation nozzle is installed at the top of the connecting box. An air cylinder is installed at the top of the mounting plate, located on the side of the connecting box near the top plate. A second connecting pipe is installed at the end of the air cylinder near the connecting box, connecting the air cylinder and the connecting box. A piston is movably installed inside the air cylinder, with its outer wall tightly against the inner wall of the air cylinder. A crossbar is installed on the side of the piston near the top plate, with one end extending through to the outside of the air cylinder and fixedly connected to the top plate.

[0013] Preferably, the movable pulley positioning assembly includes symmetrical sliding grooves inside the hoisting platform. The two sliding grooves are symmetrically located on the side away from each other of the two rotating grooves, and the two sliding grooves are respectively located above the two movable pulleys on both sides. The sliding grooves are arranged in an inverted U-shape. A sliding block is slidably installed inside the sliding groove. A bottom cylinder is installed at the bottom end of the sliding block. A vertical rod is movably installed inside the inner cavity of the bottom cylinder. A first connecting frame is installed at the bottom end of the vertical rod. The first connecting frames at the bottom ends of the two vertical rods are respectively fixedly connected to the top ends of the two movable pulleys on both sides. Longitudinal grooves are symmetrically opened on both sides of the inner wall of the inner cavity of the bottom cylinder. Sliding blocks are symmetrically installed on both sides of the top ends of the vertical rods. The sliding blocks are slidably installed inside the longitudinal grooves. A transverse movement limiting unit is installed inside the sliding grooves. A longitudinal movement limiting unit is installed on the bottom cylinder.

[0014] Preferably, the lateral movement limiting unit includes side grooves symmetrically opened on the front and back of the sliding groove. The top of the side groove has a through groove that extends to the top of the hoisting platform. A clamping plate is slidably installed inside the side groove. The length of the clamping plate is equal to the length of the sliding groove. A longitudinal plate is installed at the top of the clamping plate and is slidably installed inside the through groove. An installation groove is opened on the mounting plate and is located above the through groove. Both longitudinal plates are slidably installed inside the installation groove. A third spring is provided between the two longitudinal plates, and the two ends of the third spring are fixedly connected to the two longitudinal plates respectively.

[0015] Preferably, a pressure block is installed on each of the two longitudinal plates on the side away from each other. The pressure block is located above the mounting plate. A pressure surface is formed on the side of the pressure block away from the top plate. Two extrusion blocks are symmetrically arranged on the side of the two longitudinal plates away from each other. An extrusion surface is formed at the end of the extrusion block near the pressure block. The inclination angle of the extrusion surface is the same as the inclination angle of the pressure surface. The extrusion surface and the pressure surface are in close contact. A connecting plate is installed on each of the two extrusion blocks on the side away from each other. A second connecting frame is provided on the side of the longitudinal plate near the top plate. The second connecting frame consists of a pull plate, two first pull rods and a second pull rod. The two first pull rods are symmetrically installed on the side of the pull plate near the longitudinal plate. The two first pull rods are fixedly connected to the two connecting plates respectively. The second pull rod is fixedly installed on the side of the pull plate near the top plate and is fixedly connected to the top plate.

[0016] Preferably, the longitudinal movement limiting unit includes two vertical grooves symmetrically formed inside the bottom cylinder. The two vertical grooves are located on both sides of the bottom cylinder in the direction perpendicular to the longitudinal groove. A second rod groove is formed on the side of the bottom end of the vertical groove near the inner cavity of the bottom cylinder. The second rod groove extends into the inner cavity of the bottom cylinder. A vertical plate is movably installed inside the vertical groove. A clamping rod is installed on the side of the vertical plate near the inner cavity of the bottom cylinder. The clamping rod is movably installed inside the second rod groove. Two end grooves are symmetrically formed inside the sliding block. The two end grooves extend to the front and back of the sliding block, respectively. The top ends of the two vertical grooves are respectively connected to the two end grooves. An end block is slidably installed inside the end groove. The bottom end of the end block is fixedly connected to the top end of the vertical plate. One end of the end block is located outside the end groove. A vertical plate is installed on the side of the top ends of the two end blocks that are far apart from each other. A fourth spring is symmetrically installed on the side of the vertical plate near the inside of the end groove. One end of the fourth spring is fixedly connected to the inner wall of the end groove.

[0017] Preferably, a method for hoisting a hoisting device includes the following hoisting steps:

[0018] S1. Turn on the motor to drive the two adjusting screw sleeves to rotate. Since the adjusting screw sleeves are threadedly connected to the screw rod, and the top horizontal plate at the top of the screw rod is slidably connected to the guide support rod, the screw rod is driven to move longitudinally to adjust the height of the fixed pulley. This causes the two movable pulleys on both sides to slide relative to each other on the wire rope, thereby adjusting the distance between the two movable pulleys on both sides. This facilitates the hoisting of objects of different lengths. During hoisting, the hook is attached to the object to be hoisted, and the equipment and the object to be hoisted are lifted together by the crane for transportation.

[0019] S2. When hoisting heavy objects, the electromagnet is energized and attracts the magnetic block, pulling the moving plate towards the screw. This causes the friction vertical plate to press against the side wall of the friction groove, resulting in greater frictional resistance between the friction vertical plate and the friction groove, thus limiting the screw.

[0020] S3. When the friction vertical plate is pressed against the side wall of the friction groove, the moving vertical plate moves laterally inside the upper groove, causing the rotating rod to rotate downward and push the friction block downward, pressing it against the friction ring and generating frictional resistance on the friction ring, thereby positioning the adjusting screw sleeve.

[0021] S4. When the moving plate moves, it drives the top plate to move toward the air cylinder, thereby pushing the piston toward the connecting box, thereby continuously pushing air into the two limiting airbags, causing the limiting airbags to inflate. Since the limiting airbags are located inside the limiting grooves on the top horizontal plate, they limit the top horizontal plate after the limiting airbags inflate.

[0022] S5. After the top plate moves, it drives the extrusion block to move and generate a thrust on the pressure surface, pushing the two longitudinal plates closer to each other. Then, it drives the two clamping plates below the two longitudinal plates closer to each other. After the clamping plates contact the sliding block, the two clamping plates clamp and fix the sliding block.

[0023] S6. After the two clamping plates approach each other, they push the end block on the sliding block to move into the end groove. The end block is fixed to the clamping rod through the vertical plate, which in turn drives the clamping rod to move towards the vertical rod, so that the two clamping rods clamp and fix the vertical rod, thereby positioning the movable pulley and the fixed pulley, thus ensuring the stability of the hook position and improving the lifting stability of heavy objects.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] (1) In this invention, an electromagnet is energized to attract the magnetic block, thereby pulling the movable plate towards the screw side by the movable block, so that the friction vertical plate is pressed against the side wall of the friction groove, resulting in a large frictional resistance between the friction vertical plate and the friction groove, thereby pressing and positioning the screw, limiting the downward movement of the screw under force, and improving the hoisting stability.

[0026] (2) When the friction vertical plate is pressed against the side wall of the friction groove, the friction vertical plate and the moving plate move closer together under pressure, pushing the moving vertical plate to move laterally. Then, the rotating rod pushes the movable plate to move downward, pushing the friction block to move downward and pressing the friction ring, generating frictional resistance on the friction ring, thereby positioning the adjusting screw sleeve, preventing the adjusting screw sleeve from rotating under force, further limiting the downward movement of the screw, and improving the hoisting stability.

[0027] (3) When the moving plate moves, the top plate moves toward the air cylinder, which pushes the piston to move and continuously pushes air into the two limiting airbags, causing the limiting airbags to expand. Under the action of air pressure, the frictional resistance of the limiting airbags on the top horizontal plate is increased, which restricts the downward movement of the screw and improves the hoisting stability. At the same time, after the limiting airbags expand, the parts of the limiting airbags located on the upper and lower sides of the top horizontal plate bulge out, which further positions the top horizontal plate and further restricts the downward movement of the screw, thus improving the hoisting stability.

[0028] (4) After the top plate moves, the invention drives the extrusion block to move and generate a thrust on the pressure surface, pushing the two longitudinal plates closer to each other, and then driving the two clamping plates below the two longitudinal plates closer to each other. After the clamping plates contact the sliding block, the two clamping plates clamp and fix the sliding block, thereby limiting the position of the movable pulley, improving the hook connection stability, and improving the hoisting stability.

[0029] (5) The invention pushes the end block on the sliding block to move into the end groove after the two clamping plates come close to each other. The end block is fixed to the clamping rod through the vertical plate, which in turn drives the clamping rod to move towards the vertical rod, so that the two clamping rods clamp and fix the vertical rod, thereby further limiting the position of the movable pulley, improving the hook connection stability and hoisting stability. Attached Figure Description

[0030] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0031] In the attached diagram:

[0032] Figure 1 This is a schematic diagram of the hoisting device of the present invention;

[0033] Figure 2 This is a schematic diagram of the hoisting and adjusting assembly structure of the present invention;

[0034] Figure 3 This is a schematic diagram of the mounting shaft structure of the present invention;

[0035] Figure 4 This is a schematic diagram of the fixed pulley positioning assembly structure of the present invention;

[0036] Figure 5 This is a schematic diagram of the screw sleeve limiting unit structure of the present invention;

[0037] Figure 6 This is a schematic diagram of the auxiliary limiting unit structure of the present invention;

[0038] Figure 7 This is a schematic diagram of the structure of the movable pulley positioning assembly of the present invention;

[0039] Figure 8 This is a schematic diagram of the transverse movement limiting unit structure of the present invention;

[0040] Figure 9 This is a schematic diagram of the longitudinal movement limiting unit structure of the present invention;

[0041] In the diagram: 1. Lifting platform; 2. Connecting platform; 3. Lifting adjustment assembly; 301. Fixing ring; 302. Steel wire rope; 303. Fixed pulley; 304. Moving pulley; 305. Hook; 306. Rotating groove; 307. Adjusting screw sleeve; 308. Screw; 309. Top horizontal plate; 310. Guide groove; 311. Mounting plate; 312. Guide support rod; 313. Middle groove; 314. Limiting plate; 315. First pulley; 316. Mounting shaft; 317. Second pulley; 318. Synchronous belt; 319. Motor; 4. Fixed pulley positioning assembly; 401 402. Sliding groove; 403. Sliding block; 404. Moving plate; 405. Friction vertical plate; 406. Friction groove; 407. Fixed box; 408. Movable block; 409. Pull rod; 410. First spring; 411. Magnet; 412. Electromagnet; 413. Screw sleeve limiting unit; 414. Friction ring; 415. Movable groove; 416. Movable plate; 417. Pressure rod; 418. Friction block; 419. Second spring; 4100. Upper groove; 4121. First rod groove; 4122. Connecting rod; 41210. Moving vertical plate; 41211. Rotation 413. Rod; 4131. Auxiliary limiting unit; 4132. Limiting groove; 4133. Limiting airbag; 4134. First connecting pipe; 4135. Connecting box; 4136. Inflator; 4137. Second connecting pipe; 4138. Air cylinder; 4139. Piston; 41310. Crossbar; 41310. Top plate; 41311. Top groove; 5. Moving pulley positioning assembly; 501. Sliding groove; 502. Sliding block; 503. Bottom cylinder; 504. Vertical rod; 505. First connecting frame; 506. Longitudinal groove; 507. Sliding block; 508. Lateral movement limiting unit; 5 081, Side groove; 5082, Through groove; 5083, Clamping plate; 5084, Longitudinal plate; 5085, Mounting groove; 5086, Pressure block; 5087, Pressure surface; 5088, Third spring; 5089, Extrusion block; 50810, Extrusion surface; 50811, Connecting plate; 50812, Second connecting frame; 509, Longitudinal movement limiting unit; 5091, Vertical groove; 5092, Second rod groove; 5093, Vertical plate; 5094, Clamping rod; 5095, End groove; 5096, End block; 5097, Vertical plate; 5098, Fourth spring. Detailed Implementation

[0042] 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.

[0043] Example 1, by Figures 1-9As shown, the present invention includes two hoisting and fixing platforms 1, a connecting platform 2 is installed at equal intervals between the two hoisting and fixing platforms 1, and a hoisting adjustment assembly 3 is installed on the hoisting and fixing platforms 1;

[0044] The hoisting adjustment assembly 3 includes two fixing rings 301 symmetrically installed on both sides of the bottom end of the hoisting platform 1. A steel wire rope 302 is provided between the two fixing rings 301, and the two ends of the steel wire rope 302 are fixedly connected to the two fixing rings 301 respectively. Three movable pulleys 304 are installed on the steel wire rope 302, and the steel wire rope 302 contacts the bottom wall of the roller on the movable pulley 304. A hook 305 is installed at the bottom end of the movable pulley 304. A fixed pulley 303 is provided between two adjacent movable pulleys 304, and the steel wire rope 302 contacts the top wall of the roller on the fixed pulley 303. The hoisting platform 1 has symmetrically arranged rotating grooves 306. A screw 308 is installed at the top of a fixed pulley 303. An adjusting sleeve 307 is threaded onto the outer side of the screw 308 and rotatably mounted inside the rotating groove 306. Limiting plates 314 are symmetrically installed at the top and bottom of the rotating groove 306, respectively contacting the top and bottom walls of the hoisting platform 1. A top horizontal plate 309 is installed at the top of the screw 308. Two mounting brackets are symmetrically arranged above the hoisting platform 1. Mounting plates 311 are located above two top horizontal plates 309. Two guide support rods 312 are symmetrically installed at the bottom of each mounting plate 311. The guide support rods 312 are fixedly installed at the top of the hoisting platform 1. A guide groove 310 is provided on the top horizontal plate 309. One of the guide support rods 312 on the mounting plate 311 is slidably connected to the guide groove 310. A fixed pulley positioning assembly 4 is installed on the mounting plate 311. A central groove 313 is provided between the two rotating grooves 306. The central groove 313... The unit is equipped with a mounting shaft 316, on which two second pulleys 317 are symmetrically mounted. Two adjusting screw sleeves 307 are respectively equipped with two first pulleys 315. The two first pulleys 315 are flush with the two second pulleys 317 on the mounting shaft 316. Synchronous belts 318 are installed on the outer sides of the two second pulleys 317 and the two first pulleys 315 respectively. The mounting shaft 316 is fixedly connected to the output shaft of the motor 319. The motor 319 is fixedly mounted at the top center of the hoisting platform 1.

[0045] The fixed pulley positioning assembly 4 includes a groove 401 formed inside the mounting plate 311, extending to the bottom end of the mounting plate 311. A friction groove 405 is formed on the top horizontal plate 309, located below the groove 401 and on the side of the screw 308 away from the guide groove 310. A slider 402 is slidably mounted inside the groove 401. An auxiliary limiting unit 413 is mounted on the top of the slider 402, and a movable plate 403 is mounted on the bottom of the slider 402. A threaded sleeve limiting unit 412 is mounted on the bottom of the movable plate 403. The movable plate 403 is located inside the friction groove 405. A friction vertical plate 404 is mounted on the side of the movable plate 403 near the screw 308. A fixed box 406 is provided on the side of the movable plate 403 near the friction vertical plate 404. The fixed box 406 is fixedly mounted on the bottom wall of the mounting plate 311, and a movable sleeve is movably mounted inside the fixed box 406. The movable block 407 has a pull rod 408 installed on the side of the movable block 407 near the moving plate 403. One end of the pull rod 408 extends through to the outside of the fixed box 406 and is fixedly connected to the moving plate 403. A first spring 409 is symmetrically installed on the side of the movable block 407 away from the pull rod 408. A magnetic block 410 is installed on the side of the movable block 407 away from the pull rod 408. An electromagnet 411 is installed on the end of the fixed box 406 away from the moving plate 403. The electromagnet 411 is magnetically connected to the magnetic block 410. When the electromagnet 411 is energized, it attracts the magnetic block 410, thereby pulling the moving plate 403 towards the screw 308 via the movable block 407. This causes the friction vertical plate 404 to press against the side wall of the friction groove 405, resulting in a large frictional resistance between the friction vertical plate 404 and the friction groove 405. This presses and positions the screw 308, restricting the downward movement of the screw 308 under force and improving the hoisting stability.

[0046] The screw sleeve limiting unit 412 includes a movable groove 4122 formed inside the bottom end of the movable plate 403. A movable plate 4123 is movably installed inside the movable groove 4122. A pressure rod 4124 is installed at the bottom end of the movable plate 4123. The bottom end of the pressure rod 4124 extends to the bottom end of the movable plate 403. A friction block 4125 is installed at the bottom end of the pressure rod 4124. Two second springs 4126 are symmetrically installed at the bottom end of the movable plate 4123. The outer side of the limiting plate 314 above the adjusting screw sleeve 307 is fixed. A friction ring 4121 is fixedly installed, and a friction block 4125 is located above the friction ring 4121. An upper groove 4127 is formed at the top of the movable groove 4122. A first rod groove 4128 is formed on the side of the upper groove 4127 near the friction vertical plate 404. A connecting rod 4129 is movably installed inside the first rod groove 4128. One end of the connecting rod 4129 is fixedly connected to the friction vertical plate 404, and the other end of the connecting rod 4129 is fixedly installed with a movable vertical plate 41210. The movable vertical plate 41210 is slidably installed inside the upper groove 4127, and the side of the movable vertical plate 41210 near the friction vertical plate 404 contacts the inner wall of the upper groove 4127 near the friction vertical plate 404. A rotating rod 41211 is provided at the bottom end of the movable vertical plate 41210. One end of the rotating rod 41211 is hinged to the bottom end of the movable vertical plate 41210, and the other end of the rotating rod 41211 is hinged to the top of the movable plate 4123 away from the friction vertical plate 404. The friction vertical plate 404 and the friction groove 405 are... When the wall is pressed, under pressure, the friction vertical plate 404 and the moving plate 403 continuously approach each other, pushing the moving vertical plate 41210 to move laterally. Then, through the rotating rod 41211, the moving plate 4123 is pushed downward, pushing the friction block 4125 downward to press the friction ring 4121, generating frictional resistance on the friction ring 4121, thereby positioning the adjusting screw sleeve 307, preventing the adjusting screw sleeve 307 from rotating under force, further limiting the downward movement of the screw 308 under force, and improving the hoisting stability.

[0047] The auxiliary limiting unit 413 includes a top groove 41311 formed at the top of the slide 401, extending through to the top of the mounting plate 311. A top plate 41310 is mounted on the top of the slider 402, and the top plate 41310 is slidably mounted inside the top groove 41311. An inflatable clamping member is provided on the side of the top plate 41310 near the fixed box 406, and a movable pulley positioning assembly 5 is provided on the side of the top plate 41310 away from the fixed box 406. The inflatable clamping member includes two limiting grooves 4131 formed on the top horizontal plate 309, and the interior of the limiting grooves 4131 is provided with... A limiting airbag 4132 has its outer wall in contact with the inner wall of a limiting groove 4131. A first connecting tube 4133 is installed at the top of the limiting airbag 4132, with one end of the first connecting tube 4133 extending to the top of the mounting plate 311. A connecting box 4134 is installed at the top of the mounting plate 311, with two first connecting tubes 4133 communicating with the connecting box 4134. An inflation nozzle 4135 is installed at the top of the connecting box 4134, and an air cylinder 4137 is installed at the top of the mounting plate 311, located on the side of the connecting box 4134 near the top plate 41310. A second connecting pipe 4136 is installed at one end of the air cylinder 4137 near the connecting box 4134, connecting the air cylinder 4137 and the connecting box 4134. A piston 4138 is movably installed inside the air cylinder 4137, with the outer wall of the piston 4138 in close contact with the inner wall of the air cylinder 4137. A crossbar 4139 is installed on the side of the piston 4138 near the top plate 41310, with one end of the crossbar 4139 extending to the outside of the air cylinder 4137 and fixedly connected to the top plate 41310. When the moving plate 403 moves, it drives the top plate 41310. 310 moves toward the air cylinder 4137, pushing the piston 4138 to move and continuously pushing air into the two limiting airbags 4132, causing the limiting airbags 4132 to expand. Under the action of air pressure, the frictional resistance of the limiting airbags 4132 against the top horizontal plate 309 is increased, restricting the downward movement of the screw 308 under force and improving the hoisting stability. At the same time, after the limiting airbags 4132 expand, the parts of the limiting airbags 4132 located on the upper and lower sides of the top horizontal plate 309 bulge out, further positioning the top horizontal plate 309 and further restricting the downward movement of the screw 308 under force, thus improving the hoisting stability.

[0048] The movable pulley positioning assembly 5 includes two sliding grooves 501 symmetrically formed inside the hoisting platform 1. The two sliding grooves 501 are symmetrically located on opposite sides of the two rotating grooves 306, and are respectively positioned above the two movable pulleys 304 on both sides. The sliding grooves 501 are arranged in an inverted U-shape. A sliding block 502 is slidably installed inside the sliding groove 501. A bottom cylinder 503 is installed at the bottom end of the sliding block 502. A vertical rod 504 is movably installed inside the inner cavity of the bottom cylinder 503. The bottom of the 04 is equipped with a first connecting frame 505. The first connecting frame 505 at the bottom of the two vertical rods 504 is fixedly connected to the top of the two movable pulleys 304 on both sides. The inner wall of the bottom cylinder 503 is symmetrically provided with longitudinal grooves 506 on both sides. Sliding blocks 507 are symmetrically installed on both sides of the top of the vertical rods 504. The sliding blocks 507 are slidably installed inside the longitudinal grooves 506. The sliding grooves 501 are equipped with transverse movement limiting units 508. The bottom cylinder 503 is equipped with longitudinal movement limiting units 509.

[0049] The lateral movement limiting unit 508 includes side grooves 5081 symmetrically opened on the front and back of the sliding groove 501. A through groove 5082 is opened at the top of the side groove 5081, extending to the top of the hoisting platform 1. A clamping plate 5083 is slidably installed inside the side groove 5081. The length of the clamping plate 5083 is equal to the length of the sliding groove 501. A longitudinal plate 5084 is installed at the top of the clamping plate 5083, slidably installed inside the through groove 5082. An installation groove 5085 is opened on the mounting plate 311, located above the through groove 5082. Two longitudinal... Both longitudinal plates 5084 are slidably disposed inside the mounting groove 5085. A third spring 5088 is provided between the two longitudinal plates 5084, and the two ends of the third spring 5088 are respectively fixedly connected to the two longitudinal plates 5084. A pressure block 5086 is installed on the side of the two longitudinal plates 5084 that is far away from each other. The pressure block 5086 is located above the mounting plate 311. A pressure surface 5087 is provided on the side of the pressure block 5086 that is far away from the top plate 41310. Two extrusion blocks 5089 are symmetrically provided on the side of the two longitudinal plates 5084 that is far away from each other. An extrusion surface is provided at the end of the extrusion block 5089 near the pressure block 5086. The pressing surface 50810 has the same inclination angle as the pressure surface 5087. The pressing surface 50810 and the pressure surface 5087 are in close contact. Connecting plates 50811 are installed on the sides of the two pressing blocks 5089 that are far apart from each other. A second connecting frame 50812 is provided on the side of the longitudinal plate 5084 near the top plate 41310. The second connecting frame 50812 consists of a pulling plate, two first pulling rods and a second pulling rod. The two first pulling rods are symmetrically installed on the side of the pulling plate near the longitudinal plate 5084. The two first pulling rods are fixed to the two connecting plates 50811 respectively. The second pull rod is fixedly installed on the side of the pull plate near the top plate 41310, and the second pull rod is fixedly connected to the top plate 41310. After the top plate 41310 moves, it drives the pressing block 5089 to move and generate a pushing force on the pressure surface 5087, pushing the two longitudinal plates 5084 closer to each other, and then driving the two clamping plates 5083 below the two longitudinal plates 5084 closer to each other. After the clamping plates 5083 contact the sliding block 502, the two clamping plates 502 clamp and fix the sliding block 502, thereby limiting the position of the movable pulley 304, improving the hanging stability of the hook 305, and improving the hoisting stability.

[0050] The longitudinal movement limiting unit 509 includes two vertical grooves 5091 symmetrically formed inside the bottom cylinder 503. The two vertical grooves 5091 are located on both sides of the bottom cylinder 503 in a direction perpendicular to the longitudinal groove 506. A second rod groove 5092 is formed on the bottom end of the vertical groove 5091 near the inner cavity of the bottom cylinder 503, extending into the inner cavity of the bottom cylinder 503. A vertical plate 5093 is movably installed inside the vertical groove 5091. A clamping rod 5094 is installed on the side of the vertical plate 5093 near the inner cavity of the bottom cylinder 503, and is movably installed inside the second rod groove 5092. Two end grooves 5095 are symmetrically formed inside the sliding block 502, extending to the front and back of the sliding block 502 respectively. The top ends of the two vertical grooves 5091 are connected to the two end grooves 5095 respectively. An end block 5096 is slidably installed inside the end grooves 5095. The bottom end of the end block 5096 is fixedly connected to the top end of the vertical plate 5093. One end of the end block 5096 is located outside the end groove 5095. Vertical plates 5097 are installed on the sides of the top ends of the two end blocks 5096 that are far apart from each other. A fourth spring 5098 is symmetrically installed on the side of the vertical plate 5097 that is close to the inside of the end groove 5095. One end of the fourth spring 5098 is fixedly connected to the inner wall of the end groove 5095. After the two clamping plates 5083 approach each other, they push the end block 5096 on the sliding block 502 to move towards the inside of the end groove 5095. The end block 5096 is fixed to the clamping rod 5094 through the vertical plate 5093, which in turn drives the clamping rod 5094 to move towards the vertical rod 504, so that the two clamping rods 5094 clamp and fix the vertical rod 504, thereby further limiting the position of the movable pulley 304, improving the hooking stability of the hook 305, and improving the hoisting stability.

[0051] Working principle: When lifting an object, the hook 305 at the bottom of the movable pulley 304 lifts the object. Due to varying object lengths, when lifting a longer object, the motor 319 is positively energized, causing the mounting shaft 316 to rotate. This, in turn, moves the two synchronous belts 318, which in turn rotate the two adjusting sleeves 307. Since the adjusting sleeves 307 are threadedly connected to the screw 308, and the top horizontal plate 309 at the top of the screw 308 is slidably connected to the guide support rod 312, the screw 308 moves upward, thereby causing the fixed pulley 304 to... 3. Move upwards. At this time, the movable pulley 304 located between the fixed pulley 303 and the fixed ring 301 moves a certain distance toward the fixed ring 301, so that the distance between the two movable pulleys 304 is longer, which makes it easier to lift longer objects. When it is necessary to lift shorter objects, the motor 319 is supplied with reverse current, which makes the second pulley 317 rotate in the opposite direction, driving the adjusting screw sleeve 307 to rotate in the opposite direction, which makes the fixed pulley 303 move downwards, and then makes the two movable pulleys 304 on both sides move closer to each other, which makes it easier to lift shorter objects.

[0052] When hoisting a heavy object, after adjusting the position of the movable pulleys 304 on both sides, the electromagnet 411 is energized to attract the magnetic block 410, thereby pulling the movable block 407 towards the electromagnet 411, and then pulling the movable plate 403 towards the screw 308, so that the friction vertical plate 404 is pressed against the side wall of the friction groove 405, resulting in a large frictional resistance between the friction vertical plate 404 and the friction groove 405, thereby pressing and positioning the screw 308, limiting the downward movement of the screw 308 under force, and improving the hoisting stability.

[0053] When the friction vertical plate 404 is pressed against the side wall of the friction groove 405, the friction vertical plate 404 moves towards the moving plate 403 and presses against the moving plate 403. Then, the moving vertical plate 41210 moves laterally inside the upper groove 4127, causing the rotating rod 41211 to rotate downward and push the movable plate 4123 to move downward. Then, it pushes the friction block 4125 to move downward. During the movement of the moving plate 403, the friction block 4125 is moved to the top of the friction ring 4121. Then, when the friction block 4125 moves downward, it presses the friction ring 4121, generating frictional resistance on the friction ring 4121. This positions the adjusting screw sleeve 307, preventing the adjusting screw sleeve 307 from rotating under force, further limiting the downward movement of the screw 308 under force, and improving the hoisting stability.

[0054] When the movable plate 403 moves, it drives the top plate 41310 to move towards the air cylinder 4137, thereby pushing the piston 4138 towards the connecting box 4134. This continuously pushes air into the two limiting airbags 4132, causing the limiting airbags 4132 to inflate. Since the limiting airbags 4132 are located inside the limiting grooves 4131 on the top horizontal plate 309, after the limiting airbags 4132 inflate, the frictional resistance between the limiting airbags 4132 and the top horizontal plate 309 increases under the action of air pressure, thereby limiting the downward movement of the screw 308 under force and improving the lifting effect. To improve stability, after the limiting airbag 4132 inflates, the portions of the limiting airbag 4132 located on the upper and lower sides of the top horizontal plate 309 bulge out and contact the upper and lower side walls of the top horizontal plate 309 respectively, further positioning the top horizontal plate 309 and further limiting the downward movement of the screw 308 under force, thereby improving hoisting stability. During use, it is necessary to check the inflation status inside the limiting airbag 4132. During use, air is inflated into the limiting airbag 4132 through the inflation nozzle 4135, causing the limiting airbag 4132 to inflate into a rod shape for easy use.

[0055] Since the top of the movable pulley 304 is connected to the vertical rod 504 through the first connecting frame 505, the vertical rod 504 can move longitudinally within the bottom cylinder 503, while the sliding block 502 at the top of the bottom cylinder 503 can move laterally within the sliding groove 501. This allows the movable pulley 304 to move on the wire rope 302 when the fixed pulley 303 moves longitudinally, thus normally adjusting the distance between the two movable pulleys 304 on both sides. After the position of the movable pulley 304 is determined, the top plate 41310 moves, driving the second connecting frame 50812 to move, which in turn drives the pressing block 5089 towards the pressure point. When block 5086 moves, the pressing surface 50810 on the pressing block 5089 is in close contact with the pressing surface 5087 on the pressing block 5086, thereby generating a pushing force on the pressing surface 5087 and pushing the two longitudinal plates 5084 closer to each other. The two clamping plates 5083 at the bottom of the two longitudinal plates 5084 are respectively located on the front and back of the sliding block 502. After the two longitudinal plates 5084 are close to each other, the two clamping plates 5083 are close to each other to clamp and fix the sliding block 502, thereby limiting the position of the movable pulley 304, improving the hooking stability of the hook 305, and improving the hoisting stability.

[0056] When the two clamping plates 5083 approach each other, they push the end block 5096 on the sliding block 502 to move into the end groove 5095. The end block 5096 is fixed to the clamping rod 5094 through the vertical plate 5093, which in turn drives the clamping rod 5094 to move towards the vertical rod 504. This causes the two clamping rods 5094 to clamp and fix the vertical rod 504, thereby further limiting the position of the movable pulley 304, improving the hooking stability of the hook 305, improving the hoisting stability, sharing the downward pull on the fixed pulley 303, and reducing the probability of the screw 308 moving downward.

Claims

1. A hoisting device comprising two hoisting platforms (1), characterized in that: A connecting platform (2) is installed at equal intervals between the two hoisting fixing platforms (1), and a hoisting adjustment assembly (3) is installed on the hoisting fixing platform (1). The hoisting adjustment assembly (3) includes two fixed rings (301) symmetrically installed on both sides of the bottom end of the hoisting fixed platform (1). A wire rope (302) is provided between the two fixed rings (301). The two ends of the wire rope (302) are fixedly connected to the two fixed rings (301) respectively. Three movable pulleys (304) are installed on the wire rope (302). The wire rope (302) contacts the bottom wall of the roller on the movable pulley (304). A hook (305) is installed at the bottom end of the movable pulley (304). Two adjacent movable pulleys... A fixed pulley (303) is provided between the wheels (304). The wire rope (302) contacts the top wall of the roller on the fixed pulley (303). A rotating groove (306) is symmetrically opened on the hoisting platform (1). A screw (308) is installed at the top of the fixed pulley (303). An adjusting screw sleeve (307) is threaded on the outside of the screw (308). The adjusting screw sleeve (307) is rotatably installed inside the rotating groove (306). Limit plates (314) are symmetrically installed at the top and bottom of the rotating groove (306). A central groove (313) is provided between the two rotating grooves (306). A mounting shaft (316) is installed in the middle of the central groove (313). Two second pulleys (317) are symmetrically mounted on the mounting shaft (316). Two adjusting screw sleeves (307) are respectively mounted with two first pulleys (315). The two first pulleys (315) are flush with the two second pulleys (317) on the mounting shaft (316). Synchronous belts (318) are installed on the outer sides of the two second pulleys (317) on the mounting shaft (316). The mounting shaft (316) is fixedly connected to the output shaft of the motor (319). The motor (319) is fixedly installed at the top center of the hoisting platform (1). Two limiting plates ( 314) respectively contact the top wall and bottom wall of the hoisting platform (1), the top of the screw (308) is equipped with a top horizontal plate (309), two mounting plates (311) are symmetrically arranged above the hoisting platform (1), the two mounting plates (311) are respectively located above the two top horizontal plates (309), two guide support rods (312) are symmetrically installed at the bottom of the mounting plate (311), the guide support rods (312) are fixedly installed at the top of the hoisting platform (1), the top horizontal plate (309) is provided with a guide groove (310), one of the guide support rods (312) on the mounting plate (311) is slidably connected to the guide groove (310), and a fixed pulley positioning assembly (4) is installed on the mounting plate (311). The fixed pulley positioning assembly (4) includes a groove (401) opened inside the mounting plate (311), the groove (401) extending to the bottom end of the mounting plate (311), a friction groove (405) opened on the top horizontal plate (309), the friction groove (405) being located below the groove (401), and the friction groove (405) being located on the side of the screw (308) away from the guide groove (310), a slider (402) being slidably installed inside the groove (401), an auxiliary limiting unit (413) being installed at the top of the slider (402), a moving plate (403) being installed at the bottom end of the slider (402), a screw sleeve limiting unit (412) being installed at the bottom end of the moving plate (403), the moving plate (403) being located inside the friction groove (405), and a friction vertical plate (405) being installed on the side of the moving plate (403) near the screw (308). 04), a fixed box (406) is provided on the side of the movable plate (403) near the friction vertical plate (404). The fixed box (406) is fixedly installed on the bottom wall of the mounting plate (311). A movable block (407) is movably installed inside the fixed box (406). A pull rod (408) is installed on the side of the movable block (407) near the movable plate (403). One end of the pull rod (408) passes through to the outside of the fixed box (406) and is fixedly connected to the movable plate (403). A first spring (409) is symmetrically installed on the side of the movable block (407) away from the pull rod (408). A magnetic block (410) is installed on the side of the movable block (407) away from the pull rod (408). An electromagnet (411) is installed on the end of the fixed box (406) away from the movable plate (403). The electromagnet (411) and the magnetic block (410) are magnetically connected.

2. The hoisting device according to claim 1, characterized in that: The screw sleeve limiting unit (412) includes a movable groove (4122) opened inside the bottom end of the movable plate (403). A movable plate (4123) is movably installed inside the movable groove (4122). A pressure rod (4124) is installed at the bottom end of the movable plate (4123). The bottom end of the pressure rod (4124) extends through to the bottom end of the movable plate (403). A friction block (4125) is installed at the bottom end of the pressure rod (4124). Two second springs (4126) are symmetrically installed at the bottom end of the movable plate (4123). A friction ring (4121) is fixedly installed on the outside of the limiting plate (314) above the adjusting screw sleeve (307). The friction block (4125) is located above the friction ring (4121).

3. A hoisting device according to claim 2, characterized in that: The top of the movable groove (4122) is provided with an upper groove (4127). A first rod groove (4128) is provided on the side of the upper groove (4127) near the friction vertical plate (404). A connecting rod (4129) is movably installed inside the first rod groove (4128). One end of the connecting rod (4129) is fixedly connected to the friction vertical plate (404), and the other end of the connecting rod (4129) is fixedly installed with a movable vertical plate (41210). The movable vertical plate (41210) is slidably installed on the upper groove (4122). Inside the groove (4127), the side of the movable vertical plate (41210) near the friction vertical plate (404) is in contact with the inner wall of the upper groove (4127) near the friction vertical plate (404). The bottom end of the movable vertical plate (41210) is provided with a rotating rod (41211). One end of the rotating rod (41211) is hinged to the bottom end of the movable vertical plate (41210), and the other end of the rotating rod (41211) is hinged to the top of the movable plate (4123) away from the friction vertical plate (404).

4. A hoisting device according to claim 3, characterized in that: The auxiliary limiting unit (413) includes a top groove (41311) opened at the top of the slide groove (401), the top groove (41311) extends through to the top of the mounting plate (311), the top of the slider (402) is equipped with a top plate (41310), the top plate (41310) is slidably installed inside the top groove (41311), the top plate (41310) is provided with an inflatable clamping member on the side of the top plate (41310) close to the fixed box (406), and a movable pulley positioning assembly (5) is provided on the side of the top plate (41310) away from the fixed box (406).

5. A hoisting device according to claim 4, characterized in that: The inflatable clamping component includes two limiting grooves (4131) formed on the top horizontal plate (309). A limiting airbag (4132) is provided inside the limiting groove (4131). The outer wall of the limiting airbag (4132) contacts the inner wall of the limiting groove (4131). A first connecting pipe (4133) is installed at the top of the limiting airbag (4132). One end of the first connecting pipe (4133) extends through to the top of the mounting plate (311). A connecting box (4134) is installed at the top of the mounting plate (311). The two first connecting pipes (4133) are connected to the connecting box (4134). An inflation nozzle (4135) is installed at the top of the connecting box (4134). An air cylinder (4137) is installed at the top of the mounting plate (311). The air cylinder (4137) is located on the side of the connecting box (4134) near the top plate (41310). A second connecting pipe (4136) is installed on the end of the air cylinder (4137) near the connecting box (4134). The second connecting pipe (4136) connects the air cylinder (4137) and the connecting box (4134). A piston (4138) is installed inside the air cylinder (4137). The outer wall of the piston (4138) is in close contact with the inner wall of the air cylinder (4137). A crossbar (4139) is installed on the side of the piston (4138) near the top plate (41310). One end of the crossbar (4139) extends through to the outside of the air cylinder (4137), and one end of the crossbar (4139) is fixedly connected to the top plate (41310).

6. A hoisting device according to claim 5, characterized in that: The movable pulley positioning assembly (5) includes sliding grooves (501) symmetrically opened inside the hoisting platform (1). The two sliding grooves (501) are symmetrically located on the side away from each other of the two rotating grooves (306), and the two sliding grooves (501) are respectively located above the two movable pulleys (304) on both sides. The sliding grooves (501) are arranged in an inverted U-shape. A sliding block (502) is slidably installed inside the sliding groove (501). A bottom cylinder (503) is installed at the bottom end of the sliding block (502). A vertical rod (504) is movably installed inside the inner cavity of the bottom cylinder (503). The bottom of the two vertical rods (504) is equipped with a first connecting frame (505). The first connecting frame (505) at the bottom of the two vertical rods (504) is fixedly connected to the top of the two movable pulleys (304) on both sides respectively. The inner wall of the bottom cylinder (503) is symmetrically provided with longitudinal grooves (506). The top of the vertical rods (504) is symmetrically provided with sliding blocks (507). The sliding blocks (507) are slidably installed inside the longitudinal grooves (506). The sliding grooves (501) are equipped with transverse movement limiting units (508). The bottom cylinder (503) is equipped with longitudinal movement limiting units (509).

7. A hoisting device according to claim 6, characterized in that: The lateral movement limiting unit (508) includes side grooves (5081) symmetrically opened on the front and back of the sliding groove (501). The top of the side groove (5081) is provided with a through groove (5082), which extends to the top of the hoisting platform (1). A clamping plate (5083) is slidably installed inside the side groove (5081). The length of the clamping plate (5083) is equal to the length of the sliding groove (501). A longitudinal plate (5084) is installed at the top of the clamping plate (5083), and the longitudinal plate (5084) is slidably installed inside the through groove (5082). The mounting plate (311) has a mounting groove (5085) located above the through groove (5082). Two longitudinal plates (5084) are slidably disposed inside the mounting groove (5085). A third spring (5088) is provided between the two longitudinal plates (5084), and the two ends of the third spring (5088) are fixedly connected to the two longitudinal plates (5084) respectively. A pressure block (5086) is installed on the side of the two longitudinal plates (5084) that is far apart from each other, and the pressure block (5086) is located above the mounting plate (311). The pressure block (5086) has a pressure surface (5087) on the side away from the top plate (41310). Two extrusion blocks (5089) are symmetrically arranged on the sides of the two longitudinal plates (5084) that are away from each other. The extrusion block (5089) has an extrusion surface (50810) at the end near the pressure block (5086). The inclination angle of the extrusion surface (50810) is the same as the inclination angle of the pressure surface (5087). The extrusion surface (50810) is in close contact with the pressure surface (5087). A connecting plate is installed on the side of the two extrusion blocks (5089) that are away from each other. 50811), a second connecting frame (50812) is provided on the side of the longitudinal plate (5084) near the top plate (41310). The second connecting frame (50812) consists of a pull plate, two first pull rods and a second pull rod. The two first pull rods are symmetrically installed on the side of the pull plate near the longitudinal plate (5084). The two first pull rods are fixedly connected to the two connecting plates (50811) respectively. The second pull rod is fixedly installed on the side of the pull plate near the top plate (41310) and is fixedly connected to the top plate (41310).

8. A hoisting device according to claim 7, characterized in that: The longitudinal movement limiting unit (509) includes two vertical grooves (5091) symmetrically opened inside the bottom cylinder (503). The two vertical grooves (5091) are located on both sides of the bottom cylinder (503) in a direction perpendicular to the longitudinal groove (506). A second rod groove (5092) is opened on the side of the bottom end of the vertical groove (5091) near the inner cavity of the bottom cylinder (503). The second rod groove (5092) extends into the inner cavity of the bottom cylinder (503). A vertical plate (5093) is movably installed inside the vertical groove (5091). A clamping rod (5094) is installed on the side of the vertical plate (5093) near the inner cavity of the bottom cylinder (503). The clamping rod (5094) is movably installed inside the second rod groove (5092). Two end grooves (5094) are symmetrically opened inside the sliding block (502). 95), two end slots (5095) respectively penetrate to the front and back of the sliding block (502), the tops of two vertical slots (5091) are respectively connected to the two end slots (5095), an end block (5096) is slidably installed inside the end slot (5095), the bottom end of the end block (5096) is fixedly connected to the top of the vertical plate (5093), one end of the end block (5096) is located outside the end slot (5095), a vertical plate (5097) is installed on the side of the tops of the two end blocks (5096) that are far apart from each other, a fourth spring (5098) is symmetrically installed on the side of the vertical plate (5097) that is close to the inside of the end slot (5095), and one end of the fourth spring (5098) is fixedly connected to the inner wall of the end slot (5095).

9. A lifting method for a lifting device as described in claim 8, characterized in that: The hoisting steps are as follows: S1. Turn on the motor (319) to drive the two adjusting screw sleeves (307) to rotate. Since the adjusting screw sleeves (307) are threadedly connected to the screw (308), and the top horizontal plate (309) at the top of the screw (308) is slidably connected to the guide support rod (312), the screw (308) is driven to move longitudinally, and the height of the fixed pulley (303) is adjusted. Then, the two movable pulleys (304) on both sides slide relative to each other on the wire rope (302), thereby adjusting the distance between the two movable pulleys (304) on both sides, so as to facilitate the hoisting of objects of different lengths. During hoisting, the hook (305) is attached to the object to be hoisted, and the hoisting device and the object to be hoisted are lifted together by the crane for hoisting. S2. When hoisting heavy objects, the electromagnet (411) is energized and attracts the magnetic block (410), pulling the moving plate (403) towards the screw (308), so that the friction vertical plate (404) is pressed against the side wall of the friction groove (405), resulting in a large frictional resistance between the friction vertical plate (404) and the friction groove (405), which limits the screw (308). S3. When the friction vertical plate (404) is pressed against the side wall of the friction groove (405), the moving vertical plate (41210) moves laterally inside the upper groove (4127), causing the rotating rod (41211) to rotate downward and push the friction block (4125) to move downward, pressing against the friction ring (4121) and generating frictional resistance on the friction ring (4121), thereby positioning the adjusting screw sleeve (307); S4. When the moving plate (403) moves, it drives the top plate (41310) to move toward the air cylinder (4137), thereby pushing the piston (4138) toward the connecting box (4134), thereby continuously pushing air into the two limiting airbags (4132), causing the limiting airbags (4132) to expand. Since the limiting airbags (4132) are located inside the limiting groove (4131) on the top horizontal plate (309), the top horizontal plate (309) is limited after the limiting airbags (4132) expand. S5. After the top plate (41310) moves, it drives the pressing block (5089) to move and generate a thrust on the pressure surface (5087), pushing the two longitudinal plates (5084) closer to each other, and then driving the two clamping plates (5083) below the two longitudinal plates (5084) to move closer to each other. After the clamping plate (5083) contacts the sliding block (502), the two clamping plates (5083) clamp and fix the sliding block (502). S6. After the two clamping plates (5083) approach each other, they push the end block (5096) on the sliding block (502) to move towards the end groove (5095). The end block (5096) is fixed to the clamping rod (5094) through the vertical plate (5093), which in turn drives the clamping rod (5094) to move towards the vertical rod (504), so that the two clamping rods (5094) clamp and fix the vertical rod (504), and then position the movable pulley (304) and the fixed pulley (303), thereby ensuring the stability of the hook (305) and improving the lifting stability of heavy objects.

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