Large equipment lifting slings with adjustable length and hook protection structure

Abstract

The invention discloses a large-scale equipment lifting sling with adjustable length and having a hook protection structure, comprising a sling box, an inner wall of the sling box is rotatably connected to a winding spool, surfaces of both winding spools are wound with a sling rope, surfaces of both winding spools are fixedly sleeved with a first gear, one end of one of the winding spools extends to the outside of the sling box and is movably sleeved with a movable plate; a plurality of clamping grooves are provided on one side of the sling box, wherein the inner cavities of the two clamping grooves are clamped with clamping blocks, the two clamping blocks are fixedly connected to the movable plate, a square groove is provided at one end of the winding spool, a rotating rod is provided at one end of the sling box, a square block is fixedly connected to one end of the rotating rod, the square block is adapted to the square groove, and a first wire clamp and a second wire clamp are provided in the inner cavity of the sling box; a hook is provided at the lower end of the sling rope, a hook protection structure is provided on the outer side of the hook, a fixing piece is provided on the surface of one end of the sling rope, a mounting plate is movably sleeved on the surface of the fixing piece, and a protection box is fixedly installed on the lower surface of the mounting plate.

Description

Technical Field

[0001] The invention relates to the technical field of slings, and in particular to a large equipment hoisting sling with adjustable length and a hook protection structure. Background Art

[0002] Slings are often used in construction to connect crane hooks and hoisted equipment. Currently, the slings used in construction are usually of fixed length. When hoisting large equipment, the slings may be insufficient or too long, making it inconvenient to hoist. There is no better adjustment device, and the slings need to be replaced, which is cumbersome. In addition, existing hooks are usually exposed to the outside and have no protective device for the hooks, which may cause the hooks to collide with each other and lose paint. When the hooks are exposed to rain, they may rust, affecting their normal use. Summary of the invention

[0003] The object of the present invention is to provide a large equipment hoisting sling with adjustable length and a hook protection structure to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides a large-scale equipment lifting sling with adjustable length and a hook protection structure, which includes a sling box, the inner wall of the sling box is rotatably connected to a winding shaft, the number of the winding shafts is two, the surfaces of the two winding shafts are both wound with a lifting rope, the surfaces of the two winding shafts are both fixedly sleeved with a first gear, the two first gears are meshed, one end of one of the winding shafts extends to the outside of the sling box and is movably sleeved with a movable plate; a plurality of clamping grooves are provided on one side of the sling box, wherein the inner cavities of the two clamping grooves are both clamped with clamping blocks, and the two clamping blocks are fixed to the movable plate Connection, one end of the winding shaft is provided with a square groove, one end of the sling box is provided with a rotating rod, one end of the rotating rod is fixedly connected with a square block, the square block is adapted to the square groove, the inner cavity of the sling box is provided with a first wire clamp and a second wire clamp, the inner walls of the first wire clamp and the second wire clamp are both provided with a barb structure; a hook is provided at the lower end of the sling rope, a hook protection structure is provided on the outside of the hook, the hook protection structure includes a fixing part, a mounting plate and a protection box, wherein a fixing part is provided on the surface of one end of the sling rope, the surface of the fixing part is movably sleeved with the mounting plate, and the lower surface of the mounting plate is fixedly installed with a protection box.

[0005] In a preferred embodiment, a rack is fixedly installed on one side of the inner wall of the protection box, and a fixing plate is provided in the inner cavity of the protection box. The fixing plate is fixedly sleeved to the surface of the fixing part, and a rotating groove is opened inside the fixing plate. The inner cavity of the rotating groove is rotatably connected to a rotating shaft, and a second gear and a second worm gear are fixedly sleeved on the surface of the rotating shaft, and the second gear is meshed with the rack.

[0006] In a preferred embodiment, the inner cavity of the rotating groove is rotatably connected to a second worm, the second worm is meshed with a second worm wheel, a second motor is fixedly installed inside the fixed plate, and the output end of the second motor extends to the inner cavity of the rotating groove and is fixedly connected to the second worm.

[0007] In a preferred embodiment, threaded holes are provided on both sides of the sling box, and bolts are threadedly connected to the inner cavities of the threaded holes. One end of the bolt extends into the inner cavity of the sling box and is rotatably connected to the first wire clamp.

[0008] In a preferred embodiment, a first slide groove is opened inside the sling box, a first electromagnet is fixedly installed in the inner cavity of the first slide groove, a guide rod is fixedly installed in the inner cavity of the first slide groove, a first slider is movably sleeved on the surface of the guide rod, the first slider is fixedly connected to the first wire clamp, and a first magnetic block is fixedly installed on the lower surface of the first slider.

[0009] In a preferred embodiment, a mounting groove is provided inside the sling box, the inner cavity of the mounting groove is rotatably connected to the first worm gear, a second sliding groove is provided inside the sling box and on both sides corresponding to the mounting groove, the inner cavity of the second sliding groove is rotatably connected to a threaded rod, one end of the threaded rod extends to the inner cavity of the mounting groove and is fixedly connected to the first worm gear, a second sliding block is threadedly sleeved on the surface of the threaded rod, a second magnetic block is fixedly installed on the lower surface of the second sliding block, a second electromagnet is fixedly installed inside the second sliding groove, and the second electromagnet is in contact with the second magnetic block.

[0010] In a preferred embodiment, the inner cavity of the sling box is rotatably connected to a first worm, the first worm is meshed with a first worm wheel, a first motor is fixedly installed on the outer side of the sling box, and the output end of the first motor extends to the inner cavity of the sling box and is fixedly connected to the first worm.

[0011] In a preferred embodiment, a third sliding groove is provided on the other side of the inner wall of the protection box, a third sliding block is slidably connected to the inner cavity of the third sliding groove, and the third sliding block is fixedly connected to the fixing plate.

[0012] In a preferred embodiment, a guide plate is fixedly mounted on the upper surface of the mounting plate, and a sealing gasket is provided in the inner cavity of the mounting plate.

[0013] In a preferred embodiment, a connecting piece is fixedly installed on the top of the sling box, and the connecting piece is connected to the connecting rope.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The present invention provides a movable plate, a wire winding shaft, a clamping groove, a clamping block, a square groove, a square block and a rotating rod. The movable plate is moved to move the clamping block out of the inner cavity of the clamping groove, and the limit of the clamping groove on the clamping block is released, so that the wire winding shaft can be rotated. One end of the rotating rod is brought into contact with one end of the wire winding shaft, so that the square block extends into the inner cavity of the square groove. The rotating rod is rotated, and the cooperation of the square block and the square groove is utilized to drive one of the wire winding shafts to rotate, so that one of the first gears rotates. Since the two first gears are meshed, the other first gear is driven to rotate, so that the two wire winding shafts rotate at the same time, so that the length of the suspension rope can be adjusted more conveniently.

[0016] 2. The present invention drives the first wire clamp to move by rotating the bolt and utilizing the cooperation between the bolt and the threaded hole, and drives the first worm to rotate by the first motor. Since the first worm wheel is meshed with the first worm, the first worm drives the first worm wheel to rotate, and then the threaded rod is rotated, and the second slider is driven to move by the rotation of the threaded rod, so that the second wire clamp approaches the first wire clamp, and the first wire clamp and the second wire clamp are used to fix the lifting rope, and the second magnetic block and the second electromagnet are used to fix the second slider, and at the same time, the first magnetic block and the first electromagnet are used to fix the first wire clamp, and the cooperation between the first wire clamp, the second wire clamp, the barb, the clamping groove and the clamping block is used to prevent the lifting rope from moving downward when lifting large equipment.

[0017] 3. The present invention drives the second worm to rotate through the second motor. Since the second worm is meshed with the second worm wheel, the second worm wheel rotates. Since the second worm wheel and the second gear are fixedly sleeved on the surface of the rotating shaft, the second worm wheel drives the rotating shaft to rotate, so that the second gear rotates. Since the second gear is meshed with the rack, and the fixed plate and the fixing member are fixedly connected, the second gear drives the rack to move, so as to drive the protection box to move up and down, so that the hook is located in the inner cavity of the protection box. When not in use, the protection box can be used to protect the hook to avoid collision between multiple hooks, resulting in paint falling off.

[0018] 4. The present invention can prevent rainwater from falling on the surface of the hook and causing the hook to rust by arranging a guide plate on the upper surface of the mounting plate and a sealing gasket between the mounting plate and the fixing member. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic cross-sectional view of the overall structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 3 for Figure 1 A magnified view of the structure at center A;

[0022] Figure 4 for Figure 1 A magnified view of the structure at B in the middle;

[0023] Figure 5 for Figure 1 A magnified view of the structure at C in the middle;

[0024] Figure 6 It is a structural schematic diagram of the side surface of the movable plate of the present invention;

[0025] Figure 7 It is a schematic cross-sectional structural diagram of the first wire clamp and the second wire clamp of the present invention;

[0026] Figure 8 It is a schematic cross-sectional structural diagram of the side of the sling box of the present invention.

[0027] Description of reference numerals:

[0028] 1. Sling box; 2. Wire reel; 3. Sling; 4. First gear; 5. Movable plate; 6. Snap-in groove; 7. Snap-in block; 8. Square groove; 9. Rotating rod; 10. Square block; 11. First wire clamp; 12. Second wire clamp; 13. Threaded hole; 14. Bolt; 15. First slide groove; 16. Guide rod; 17. First slider; 18. First magnetic block; 19. First electromagnet; 20. Mounting groove; 21. First worm gear; 22. Second slide groove; 23. Threaded rod; 24. Second slider; 25. Second magnetic block; 26. Second electromagnet; 27. First motor; 28. First worm; 29. ​​Mounting plate; 30. Protection box; 31. Rack; 32. Fixed plate; 33. Rotating groove; 34. Rotating shaft; 35. Second gear; 36. Second worm gear; 37. Second worm; 38. Second motor; 39. Third slide groove; 40. Third slider; 41. Guide plate; 42. Sealing pad; 43. Barb; 44. Connector; 45. Connecting rope; 46. Fixing piece; 47. Hook. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention are described clearly and completely below. The embodiments of the present invention and all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0030] Example 1

[0031] like Figure 1-8As shown, the large equipment hoisting sling with adjustable length and hook protection structure according to the preferred embodiment of the present invention comprises a sling box 1, the inner wall of the sling box 1 is rotatably connected with a winding shaft 2, the number of the winding shafts 2 is two, and the surfaces of the two winding shafts 2 are both wound with a lifting rope 3. The surfaces of the two winding shafts 2 are both fixedly sleeved with a first gear 4, the two first gears 4 are meshed, one end of one of the winding shafts 2 extends to the outside of the sling box 1 and is movably sleeved with a movable plate 5. A plurality of snap-in grooves 6 are provided on one side of the sling box 1, wherein the inner cavities of the two snap-in grooves 6 are both snap-in with a snap-in block 7, and the two snap-in blocks 7 are both fixedly connected to the movable plate 5, and a square groove 8 is provided at one end of the winding shaft 2. One end of the sling box 1 is provided with a rotating rod 9, and one end of the rotating rod 9 is fixedly connected with a square block 10, which is adapted to the square slot 8. By moving the movable plate 5, the clamping block 7 is moved out of the inner cavity of the clamping slot 6, and the clamping slot 6 releases the limit of the clamping block 7, so that the winding shaft 2 can be rotated. One end of the rotating rod 9 is brought into contact with one end of the winding shaft 2, so that the square block 10 extends into the inner cavity of the square slot 8, and the rotating rod 9 is rotated. The square block 10 and the square slot 8 are used to drive one of the winding shafts 2 to rotate, so that one of the first gears 4 rotates. Since the two first gears 4 are meshed, one of the first gears 4 drives the other first gear 4 to rotate, so that the two winding shafts 2 rotate at the same time, and then the length of the sling rope 3 can be adjusted, which is more convenient. The inner cavity of the sling box 1 is provided with a first wire clamp 11 and a second wire clamp 12, and the inner walls of the first wire clamp 11 and the second wire clamp 12 are both provided with a barb structure 43. A hook is provided at the lower end of the sling rope, and a hook protection structure is provided on the outer side of the hook. The hook protection structure includes a fixing part, a mounting plate and a protection box, wherein a fixing part is provided on the surface of one end of the sling rope, and a mounting plate is movably sleeved on the surface of the fixing part, and a protection box is fixedly installed on the lower surface of the mounting plate.

[0032] Furthermore, threaded holes 13 are provided on both sides of the sling box 1, and bolts 14 are threadedly connected to the inner cavity of the threaded holes 13, and one end of the bolt 14 extends to the inner cavity of the sling box 1 and is rotatably connected to the first wire clamp 11. A first slide 15 is provided inside the sling box 1, and a first electromagnet 19 is fixedly installed in the inner cavity of the first slide 15, and a guide rod 16 is fixedly installed in the inner cavity of the first slide 15, and a first slider 17 is movably sleeved on the surface of the guide rod 16, and the first slider 17 is fixedly connected to the first wire clamp 11, and a first magnetic block 18 is fixedly installed on the lower surface of the first slider 17.

[0033] Furthermore, a mounting groove 20 is provided inside the sling box 1, and the inner cavity of the mounting groove 20 is rotatably connected to the first worm gear 21. A second sliding groove 22 is provided inside the sling box 1 and on both sides corresponding to the mounting groove 20. The inner cavity of the second sliding groove 22 is rotatably connected to a threaded rod 23. One end of the threaded rod 23 extends to the inner cavity of the mounting groove 20 and is fixedly connected to the first worm gear 21. A second sliding block 24 is threadedly sleeved on the surface of the threaded rod 23. A second magnetic block 25 is fixedly installed on the lower surface of the second sliding block 24. A second electromagnet 26 is fixedly installed inside the second sliding groove 22, and the second electromagnet 26 is in contact with the second magnetic block 25.

[0034] Furthermore, the inner cavity of the sling box 1 is rotatably connected to a first worm 28, which is meshed with the first worm wheel 21. A first motor 27 is fixedly installed on the outer side of the sling box 1, and the output end of the first motor 27 extends to the inner cavity of the sling box 1 and is fixedly connected to the first worm 28.

[0035] By rotating the bolt 14, the first wire clamp 11 is driven to move by utilizing the cooperation between the bolt 14 and the threaded hole 13, and the first worm 28 is driven to rotate by the first motor 27. Since the first worm wheel 21 is meshed with the first worm wheel 28, the first worm wheel 28 drives the first worm wheel 21 to rotate, thereby rotating the threaded rod 23, and the second slider 24 is driven to move by the rotation of the threaded rod 23, so that the second wire clamp 12 is close to the first wire clamp 11, and the first wire clamp 11 and the second wire clamp 12 are used to fix the lifting rope 3, and the second magnetic block 25 and the second electromagnet 26 are used to fix the second slider 24, and at the same time, the first magnetic block 18 and the first electromagnet 19 are used to fix the first wire clamp 11, and the cooperation between the first wire clamp 11, the second wire clamp 12, the barb 43, the clamping groove 6 and the clamping block 7 is used to prevent the lifting rope 3 from moving downward when lifting large equipment.

[0036] Example 2

[0037] In a preferred embodiment, a rack 31 is fixedly installed on one side of the inner wall of the protection box 30, and a fixing plate 32 is provided in the inner cavity of the protection box 30. The fixing plate 32 is fixedly sleeved on the surface of the fixing member 46, and a rotating groove 33 is opened inside the fixing plate 32. The inner cavity of the rotating groove 33 is rotatably connected with a rotating shaft 34, and the surface of the rotating shaft 34 is fixedly sleeved with a second gear 35 and a second worm gear 36, the second gear 35 is meshed with the rack 31, and the inner cavity of the rotating groove 33 is rotatably connected with a second worm 37, and the second worm 37 is meshed with the second worm gear 36. A second motor 38 is fixedly installed inside the fixing plate 32, and the output end of the second motor 38 extends to the inner cavity of the rotating groove 33 and is fixedly connected to the second worm 37.

[0038] Furthermore, a third sliding groove 39 is opened on the other side of the inner wall of the protection box 30 , and a third sliding block 40 is slidably connected to the inner cavity of the third sliding groove 39 , and the third sliding block 40 is fixedly connected to the fixing plate 32 .

[0039] The second motor 38 drives the second worm 37 to rotate. Since the second worm 37 is meshed with the second worm wheel 36, the second worm wheel 36 rotates. Since the second worm wheel 36 and the second gear 35 are both fixedly sleeved on the surface of the rotating shaft 34, the second worm wheel 36 drives the rotating shaft 34 to rotate, so that the second gear 35 rotates. Since the second gear 35 is meshed with the rack 31, and the fixing plate 32 and the fixing member 46 are fixedly connected, the second gear 35 drives the rack 31 to move, and drives the protection box 30 to move up and down, so that the hook 47 is located in the inner cavity of the protection box 30. When not in use, the protection box 30 can be used to protect the hook 47 to avoid collision between multiple hooks 47, resulting in paint falling off.

[0040] Furthermore, a guide plate 41 is fixedly mounted on the upper surface of the mounting plate 29, and a sealing pad 42 is provided in the inner cavity of the mounting plate 29. A connecting piece 44 is fixedly mounted on the top of the sling box 1, and the connecting piece 44 is connected to a connecting rope 45.

[0041] By providing a guide plate 41 on the upper surface of the mounting plate 29 and providing a sealing gasket 42 between the mounting plate 29 and the fixing member 46 , it is possible to prevent rainwater from dripping onto the surface of the hook 47 and causing the hook 47 to rust.

[0042] Example 3

[0043] The specific working principle of the present invention is described below:

[0044] When the present invention is used, first move the movable plate 5 to move the clamping block 7 out of the inner cavity of the clamping groove 6, release the limit of the clamping groove 6 on the clamping block 7, so that the winding shaft 2 can rotate, and make one end of the rotating rod 9 contact with one end of the winding shaft 2, so that the square block 10 extends into the inner cavity of the square groove 8, rotate the rotating rod 9, and use the cooperation between the square block 10 and the square groove 8 to drive one of the winding shafts 2 to rotate, so that one of the first gears 4 rotates, and since the two first gears 4 are meshed, one of the first gears 4 drives the other first gear 4 to rotate, so that the two winding shafts 2 rotate at the same time, and then the length of the suspension rope 3 can be adjusted.

[0045] After the suspension rope 3 is adjusted to an appropriate length, the bolt 14 is rotated, and the first wire clamp 11 is driven to move by the cooperation between the bolt 14 and the threaded hole 13, and the first motor 27 is started, and the first worm 28 is driven to rotate by the first motor 27. Since the first worm wheel 21 is meshed with the first worm 28, the first worm 28 drives the first worm wheel 21 to rotate, and then the threaded rod 23 is rotated. The second slider 24 is driven to move by the rotation of the threaded rod 23, so that the second wire clamp 12 approaches the first wire clamp 11, and the suspension rope 3 is fixed by the first wire clamp 11 and the second wire clamp 12. At the same time, the first magnetic block 18 and the first electromagnet 19 are used to fix the first wire clamp 11, and the second magnetic block 25 and the second electromagnet 26 are used to fix the second slider 24, and then the second wire clamp 12 is fixed, and the suspension rope 3 is further fixed by the barb 43. When not in use, start the second motor 38, and the second motor 38 drives the second worm 37 to rotate. Since the second worm 37 is meshed with the second worm wheel 36, the second worm wheel 36 rotates. Since the second worm wheel 36 and the second gear 35 are fixedly sleeved on the surface of the rotating shaft 34, the second worm wheel 36 drives the rotating shaft 34 to rotate, so that the second gear 35 rotates. Since the second gear 35 is meshed with the rack 31, and the fixing plate 32 and the fixing member 46 are fixedly connected, the second gear 35 drives the rack 31 to move, and drives the protection box 30 to move up and down, so that the hook 47 is located in the inner cavity of the protection box 30.

[0046] When not in use, the protective box 30 can be used to protect the hook 47. By providing a guide plate 41 on the upper surface of the mounting plate 29 and a sealing gasket 42 between the mounting plate 29 and the fixing member 46, it is possible to prevent rain from dripping onto the surface of the hook 47 and causing the hook 47 to rust.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A large equipment lifting sling with adjustable length and hook protection structure, characterized in that: The large equipment lifting sling with adjustable length and having a hook protection structure comprises a sling box (1), the inner wall of the sling box (1) is rotatably connected to a winding shaft (2), the number of the winding shafts (2) is two, the surfaces of the two winding shafts (2) are both wound with a lifting rope (3), the surfaces of the two winding shafts (2) are both fixedly sleeved with a first gear (4), the two first gears (4) are meshed with each other, one end of one of the winding shafts (2) extends to the outside of the sling box (1) and is movably sleeved with a movable plate (5); A plurality of snap-in grooves (6) are provided on one side of the sling box (1), wherein the inner cavities of two of the snap-in grooves (6) are snap-in with snap-in blocks (7), and the two snap-in blocks (7) are fixedly connected to the movable plate (5); a square groove (8) is provided on one end of the winding shaft (2); a rotating rod (9) is provided on one end of the sling box (1), and a square block (10) is fixedly connected to one end of the rotating rod (9), and the square block (10) is matched with the square groove (8); a first wire clamp (11) and a second wire clamp (12) are provided in the inner cavity of the sling box (1), and the inner walls of the first wire clamp (11) and the second wire clamp (12) are provided with barb structures (43); A hook (47) is provided at the lower end of the lifting rope (3), a hook protection structure is provided on the outer side of the lifting hook (47), and the hook protection structure comprises a fixing member (46), a mounting plate (29) and a protection box (30), wherein a fixing member (46) is provided on the surface of one end of the lifting rope (3), a mounting plate (29) is movably sleeved on the surface of the fixing member (46), and a protection box (30) is fixedly mounted on the lower surface of the mounting plate (29); The sling box (1) is provided with threaded holes (13) on both sides, the inner cavity of the threaded hole (13) is threadedly connected with a bolt (14), one end of the bolt (14) extends into the inner cavity of the sling box (1) and is rotatably connected to the first wire clamp (11); the interior of the sling box (1) is provided with a first slide groove (15), the inner cavity of the first slide groove (15) is fixedly installed with a first electromagnet (19), the inner cavity of the first slide groove (15) is fixedly installed with a guide rod (16), the surface of the guide rod (16) is movably sleeved with a first slider (17), the first slider (17) is fixedly connected to the first wire clamp (11), and the lower surface of the first slider (17) is fixedly installed with a first magnetic block (18); the interior of the sling box (1) is provided with a mounting groove (20), the inner cavity of the mounting groove (20) is rotatably connected with a first worm gear (21), the interior of the sling box (1) and located in the mounting groove (20) ) are provided with second slide grooves (22) on both sides corresponding to each other, the inner cavity of the second slide groove (22) is rotatably connected to a threaded rod (23), one end of the threaded rod (23) extends to the inner cavity of the mounting groove (20) and is fixedly connected to the first worm gear (21), the surface of the threaded rod (23) is threadedly sleeved with a second slider (24), the lower surface of the second slider (24) is fixedly installed with a second magnetic block (25), the interior of the second slide groove (22) is fixedly installed with a second electromagnet (26), the second electromagnet (26) is in contact with the second magnetic block (25); the inner cavity of the sling box (1) is rotatably connected to a first worm (28), the first worm (28) is meshed with the first worm gear (21), the outer side of the sling box (1) is fixedly installed with a first motor (27), the output end of the first motor (27) extends to the inner cavity of the sling box (1) and is fixedly connected to the first worm (28).

2. The large equipment hoisting sling with adjustable length and hook protection structure according to claim 1 is characterized in that: A rack (31) is fixedly mounted on one side of the inner wall of the protection box (30); a fixing plate (32) is provided in the inner cavity of the protection box (30); the fixing plate (32) is fixedly sleeved on the surface of the fixing member (46); a rotation groove (33) is provided inside the fixing plate (32); a rotation shaft (34) is rotatably connected to the inner cavity of the rotation groove (33); a second gear (35) and a second worm gear (36) are fixedly sleeved on the surface of the rotation shaft (34); the second gear (35) is meshed with the rack (31).

3. The large equipment hoisting sling with adjustable length and hook protection structure according to claim 2 is characterized in that: A second worm (37) is rotatably connected to the inner cavity of the rotating groove (33), and the second worm (37) is meshed with a second worm wheel (36). A second motor (38) is fixedly installed inside the fixed plate (32), and an output end of the second motor (38) extends to the inner cavity of the rotating groove (33) and is fixedly connected to the second worm (37).

4. The large equipment hoisting sling with adjustable length and hook protection structure according to claim 3 is characterized in that: A third sliding groove (39) is provided on the other side of the inner wall of the protection box (30), a third sliding block (40) is slidably connected to the inner cavity of the third sliding groove (39), and the third sliding block (40) is fixedly connected to the fixing plate (32).

5. The large equipment hoisting sling with adjustable length and hook protection structure according to claim 1, characterized in that: A guide plate (41) is fixedly mounted on the upper surface of the mounting plate (29), and a sealing gasket (42) is provided in the inner cavity of the mounting plate (29).

6. The large equipment hoisting sling with adjustable length and hook protection structure according to claim 4, characterized in that: A connecting piece (44) is fixedly mounted on the top of the sling box (1), and the connecting piece (44) is connected to a connecting rope (45).

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