Improved hoisting device

Abstract

The utility model discloses an improved hoisting device, relates to jumbolter technical field, wherein the jumbolter includes the mast that extends along the longitudinal direction, the improved hoisting device includes fixed seat, support table, first telescopic subassembly and hoisting arm, fixed seat is connected with the mast, support table drive connection first telescopic subassembly, hoisting arm drive connection first telescopic subassembly, hoisting arm drive connection first telescopic subassembly, hoisting arm drive connection first telescopic subassembly. The top end of the supporting table located at the first position is far away from the fixing base and is rotationally connected with the hoisting arm, the hoisting arm is provided with an abutting face on the circumferential side face, the improved hoisting device has a hoisting state and a storage state, in the hoisting state, the hoisting arm extends in the transverse direction, the abutting face abuts against the top end face of the mast, and in the storage state, the hoisting arm extends in the transverse direction. The supporting table is located at a first position; in the storage state, the hoisting arm extends longitudinally, the top end face of the hoisting end does not exceed the top end face of the mast, and the supporting table is located at the second position. According to the technical scheme provided by the utility model, the space occupied by the improved hoisting device can be reduced when the mast is stored in the jumbolter.

Description

Technical Field

[0001] The utility model relates to the technical field of anchor drilling machines, in particular to a reformable hoisting device. Background Art

[0002] Anchor drilling rigs are foundation construction machinery, mainly used in landslide control projects and dangerous rock anchoring projects for railways, highways, water conservancy and hydropower facilities, control of building displacement and other high slope rock anchoring projects, and are also used in the construction of urban deep foundation pit support and foundation reinforcement engineering holes, blasting holes for blasting projects, and tunnel pipe support holes.

[0003] The current anchor drilling rig structure on the market integrates hoisting and drilling. Specifically, a modified hoisting device is fixedly connected to the top of the anchor drilling rig's mast, enabling the hoisting of materials through the modified hoisting device, allowing materials to be brought from high altitude to ground facilities and transported to confined spaces. When the anchor drilling rig is not in use, the mast equipped with the modified hoisting device is placed horizontally within the anchor drilling rig. Due to the length of the mast itself, and the combined installation of the mast and modified hoisting device, the modified hoisting device takes up a large amount of space within the anchor drilling rig, making it difficult to store the mast. Utility Model Content

[0004] The main purpose of the utility model is to provide a modified hoisting device, which aims to reduce the space occupied by the modified hoisting device when the mast is stored in the anchor drilling rig.

[0005] To achieve the above-mentioned purpose, the utility model proposes a modified lifting device for an anchor drilling rig, wherein the anchor drilling rig includes a mast extending longitudinally. The modified lifting device includes:

[0006] The mounting assembly includes a fixed seat, a support platform, and a first telescopic assembly, wherein the fixed seat is provided on a side of the mast, the support platform is drivingly connected to the first telescopic assembly so as to be slidable longitudinally on the fixed seat and has a first position and a second position, wherein the top end of the support platform in the first position is away from the fixed seat; and

[0007] The lifting arm has a relative connecting end and a lifting end, the connecting end is rotatably arranged at the top end of the support platform, and has an abutment surface on the peripheral side surface, the modified lifting device has a lifting state and a storage state, in the lifting state, the lifting arm extends horizontally and the abutment surface abuts against the top end surface of the mast, and the support platform is in the first position; in the storage state, the lifting arm extends longitudinally and the top end surface of the lifting end does not exceed the top end surface of the mast, and the support platform is in the second position.

[0008] In one embodiment, the first telescopic assembly includes a first driving member, the support platform includes a table plate and two telescopic rods arranged below the table plate, the two telescopic rods are arranged at intervals, the fixed seat includes two sliding grooves arranged relative to the telescopic rods, the first driving member is arranged on the fixed seat and is located between the two sliding grooves, and the driving rod of the first driving member is connected to the table plate, and the telescopic rod can slide longitudinally in the sliding groove.

[0009] In one embodiment, the telescopic rod is provided with a limiting protrusion, and the slide groove is provided with a guide hole, which extends longitudinally. The limiting protrusion can move in the guide hole. In the first position, the limiting protrusion abuts against one end of the guide hole close to the lifting arm; in the second position, the limiting protrusion abuts against one end of the guide hole away from the lifting arm.

[0010] In one embodiment, the support platform also includes a support frame, which is arranged on the upper side of the table plate. The connection between the lifting arm and the support frame has a rotation axis, and the rotation axis is arranged close to the connection end. The lifting arm rotates around the rotation axis and has a third position and a fourth position. In the third position, the lifting arm rotates to extend laterally and the abutting surface abuts against the top surface of the mast to correspond to the lifting state; in the fourth position, the lifting arm extends longitudinally.

[0011] In one embodiment, the mounting assembly further includes a limiting support rod, one end of the limiting support rod is rotatably connected to the table and disposed close to the support frame, and the other end is detachably connected to the connecting end, and the support frame extends longitudinally. In the third position, the limiting support rod is connected to the connecting end and extends obliquely in the longitudinal direction away from the mast; in the fourth position, the limiting support rod is detached from the connecting end.

[0012] In one embodiment, the mounting assembly further includes a second telescopic assembly, which is capable of driving the lifting arm to rotate between the third position and the fourth position, and the limiting support rod and the second telescopic assembly are configured as the same structure.

[0013] In one embodiment, the support frame includes two support arms arranged at intervals, the lifting arm and the second telescopic assembly are both arranged between the two support arms, and the lifting arm is connected to the support arm at the top end of the support arm.

[0014] In one embodiment, the second telescopic assembly includes a second driving member, a first set of rods and a second set of rods, the first set of rods is sleeved on the second set of rods, and the second driving member is provided on the support platform and drives the first set of rods to move along the axial direction of the second set of rods.

[0015] In one embodiment, the lifting arm includes a lifting rope and a hook, and the lifting arm is provided with a through hole, which extends along the thickness direction of the lifting arm and is provided at one end of the lifting arm away from the mast. The lifting arm includes a mounting surface arranged opposite to the abutment surface, and part of the lifting rope is arranged on the mounting surface. The free end of the lifting rope passes through the through hole from the mounting surface and is connected to the hook on the abutment surface.

[0016] In one embodiment, the hook and the free end of the lifting rope are connected through a buffer fixing assembly, and a rope winding wheel is further provided on the mounting surface. Part of the lifting rope on the mounting surface is wound on the rope winding wheel, and the rope winding wheel can rotate to retract and release the lifting rope so that the hook has a fifth position and a sixth position. In the fifth position, the hook is close to the through hole, and the buffer fixing assembly is in contact with the through hole; in the sixth position, the hook is away from the through hole.

[0017] In one embodiment, the buffer fixing assembly includes a fixing plate, an elastic member and an abutment member connected in sequence, the fixing plate is connected to the hook, and the free end of the lifting rope is connected to pass through the abutment member and the elastic member in sequence and connected to the fixing plate.

[0018] In the technical solution of the present invention, the orientations and directions appearing in the above text are all based on the state when the modified lifting device and the mast are in the working scene, that is, when the mast is vertically installed on the anchor drilling rig.

[0019] In the technical solution of the present invention, by changing the extension direction of the lifting arm and the positional relationship of the lifting arm with respect to the mast in the extension direction of the mast, the top end of the lifting arm of the modified lifting device in the stored state is lower than the bottom end of the mast, and the extension direction of the lifting arm is consistent with the extension direction of the mast, that is, the lifting arm is attached to the circumference of the mast, so as to avoid the modified lifting device protruding from the mast in the axial direction of the mast and at the same time reduce the space occupied by the modified lifting device in the radial direction of the mast. The modified lifting device in the technical solution of the present invention has no structure protruding from the top end of the mast in the stored state and does not occupy too much space in the radial direction of the mast, which can avoid the modified lifting device from occupying too much space in the anchor drilling rig and prevent the mast from being unstable or unable to be placed on the anchor drilling rig. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0021] Figure 1 This is a structural diagram of an embodiment of the modified hoisting device provided by the present utility model in a hoisting state;

[0022] Figure 2 for Figure 1 A front view of the modified lifting device shown in the stowed state.

[0023] Description of Figure Numbers:

[0024] 100, mounting assembly; 11, fixing seat; 111, slide groove; 112, guide hole; 12, support platform; 121, platform; 122, telescopic rod; 123, support frame; 124, support arm; 125, limiting protrusion; 13, first telescopic assembly; 131, first driving member; 14, second telescopic assembly; 141, first set of rods; 142, second set of rods;

[0025] 200, lifting arm; 21, connecting end; 22, lifting end; 23, lifting rope; 24, hook; 25, through hole; 26, rope reel;

[0026] 300, buffer fixing assembly; 31, fixing plate; 32, elastic member; 33, abutting member;

[0027] 400. Mast.

[0028] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0030] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0031] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0032] The utility model provides a reformed lifting device.

[0033] See also Figures 1 to 2 In one embodiment of the present invention, the modified lifting device is used for an anchor drilling rig, the anchor drilling rig includes a mast 400 extending longitudinally, and the modified lifting device includes:

[0034] The mounting assembly 100 includes a fixed seat 11, a support platform 12, and a first telescopic assembly 13. The fixed seat 11 is provided on the side of the mast 400. The support platform 12 is driven and connected to the first telescopic assembly 13 so as to be slidable longitudinally on the fixed seat 11 and has a first position and a second position. In the first position, the top end of the support platform 12 is away from the fixed seat 11.

[0035] The lifting arm 200 has a relative connecting end 21 and a lifting end 22. The connecting end 21 is rotatably arranged at the top end of the support platform 12 and has an abutting surface on the peripheral side. The modified lifting device has a lifting state and a storage state. In the lifting state, the lifting arm 200 extends horizontally and the abutting surface abuts against the top end surface of the mast 400, and the support platform 12 is in the first position; in the storage state, the lifting arm 200 extends longitudinally and the top end surface of the lifting end 22 does not exceed the top end surface of the mast 400, and the support platform 12 is in the second position.

[0036] In the technical solution of the present invention, the orientations and directions appearing in the above text are all based on the state when the modified lifting device and the mast 400 are in the working scene, that is, the mast 400 is vertically installed on the anchor drilling rig. For the sake of ease of understanding and writing, the orientations and directions appearing in the following text are all based on the state when the modified lifting device and the mast 400 are in the working scene.

[0037] In the technical solution of the present invention, by changing the extension direction of the lifting arm 200 and the positional relationship of the lifting arm 200 with respect to the mast 400 in the extension direction, the top end of the lifting arm 200 of the modified lifting device in the stowed state is lower than the bottom end of the mast 400, and the extension direction of the lifting arm 200 is consistent with the extension direction of the mast 400. In other words, the lifting arm 200 is in close contact with the circumference of the mast 400. This prevents the modified lifting device from protruding from the mast 400 in the axial direction of the mast 400 and simultaneously reduces the space occupied by the modified lifting device in the radial direction of the mast 400. In the stowed state, the modified lifting device of the present invention has no structure protruding from the top end of the mast 400 and does not occupy excessive space in the radial direction of the mast 400. This prevents the modified lifting device from occupying excessive space within the anchor drilling rig, thereby preventing the mast 400 from being unstable or impossible to place on the anchor drilling rig.

[0038] In one embodiment, the first telescopic assembly 13 includes a first driving member 131. The support platform 12 includes a platform 121 and two telescopic rods 122 disposed below the platform 121, with the two telescopic rods 122 spaced apart. The fixed base 11 includes two slide slots 111 disposed relative to the telescopic rods 122. The first driving member 131 is disposed on the fixed base 11 and positioned between the two slide slots 111. The driving rod of the first driving member 131 is connected to the platform 121 to lift the platform 121 for longitudinal movement. The telescopic rods 122 can slide longitudinally within the slide slots 111. The slide slots 111 restrict the movement direction of the telescopic rods 122, thereby preventing the platform 121 from shaking during longitudinal movement, thereby affecting the lifting stability of the lifting arm 200. In other embodiments, the first driving member 131 can also be disposed within the slide slots 111 to lift the telescopic rods 122.

[0039] In one embodiment, the telescopic rod 122 is provided with a limiting protrusion 125, and the slide groove 111 is provided with a guide hole 112, which extends longitudinally, and the limiting protrusion 125 can move in the guide hole 112. In the first position, the limiting protrusion 125 abuts against the end of the guide hole 112 close to the lifting arm 200. When the lifting end 22 of the lifting arm 200 has a lifting object, the limiting protrusion 125 and the guide hole 112 can strengthen the connection between the telescopic rod 122 and the slide groove 111 to prevent the telescopic rod 122 from disengaging from the slide groove 111; in the second position, the limiting protrusion 125 abuts against the end of the guide hole 112 away from the lifting arm 200. During the longitudinal movement of the support platform 12, the guide hole 112 and the limiting block can further limit the moving direction of the support platform 12 to prevent the support platform 12 from shaking relative to the fixed seat 11 during the longitudinal movement. In other embodiments, the limiting protrusion 125 and the guide hole 112 may not be provided, and a blocking piece abutting against the telescopic rod 122 is provided at the top of the slide groove 111 to prevent the telescopic rod 122 from falling out of the slide groove 111 in the first position.

[0040] In one embodiment, the support platform 12 also includes a support frame 123, which is arranged on the upper side of the table 121. The connection between the lifting arm 200 and the support frame 123 has a rotation axis, and the rotation axis is arranged close to the connection end 21. The lifting arm 200 rotates around the rotation axis and has a third position and a fourth position. In the third position, the lifting arm 200 rotates to extend laterally and the abutting surface abuts against the top surface of the mast 400 to correspond to the lifting state; in the fourth position, the lifting arm 200 extends longitudinally. It can be understood that when the fixing seat 11 is installed on the mast 400, the first driving member 131 drives the support platform 12 to move from the second position to the first position. When the support sleeve moves to the first position, the lifting arm 200 rotates from the fourth position to the third position. At this time, the modified lifting device is in a lifting state. When the anchor drilling rig completes the lifting operation, the lifting arm 200 is first rotated from the third position to the fourth position to make the extension direction of the lifting arm 200 consistent with the extension direction of the mast 400. Finally, the first driving member 131 drives the support platform 12 from the first position back to the second position. At this time, the modified lifting device is in a storage state. In other embodiments, the support frame 123 may not be provided, and the lifting arm 200 is provided with fixed structures on the mast 400 and the support platform 12 respectively. When the lifting arm 200 is connected to the fixed structure on the mast 400, the lifting arm 200 extends in the horizontal direction. When the lifting arm 200 is connected to the fixed structure on the support platform 12, the lifting arm 200 extends in the longitudinal direction. The installation position of the lifting arm 200 can be changed through manual operation.

[0041] In one embodiment, the mounting assembly 100 further includes a limited support rod, one end of which is rotatably connected to the platform 121 and disposed adjacent to the support frame 123, and the other end of which is detachably connected to the connecting end 21. The support frame 123 extends longitudinally. In a third position, the limited support rod is connected to the connecting end 21 and extends longitudinally away from the mast 400 at an angle. In a fourth position, the limited support rod is detached from the connecting end 21. When in the hoisting state, since the rotation axis is disposed adjacent to the connecting end 21, the torque transmission path from the connecting end 21 to the rotation axis to the hoisting end 22 forms a force-saving lever. When the hoisting end 22 is loaded with material, the hoisting end 22 is subjected to a downward pull. At this time, the limited support rod, the support frame 123, and the hoisting arm 200 form a triangular force-bearing structure that can effectively withstand the pull transmitted from the hoisting end 22. The abutment surface and the top end of the mast 400 are located between the rotation axis and the support end to assist in the hoisting arm 200. When the crane arm 200 needs to be rotated from the third position to the fourth position, the crane arm 200 can be smoothly rotated by detaching the connection end 21 and the limit support rod. In other embodiments, the limit support rod may not be provided, and the support frame 123 extends longitudinally in an inclined direction away from the mast 400, so that the support frame 123, the mast 400, and the crane arm 200 form a triangular force-bearing structure.

[0042] In one embodiment, the mounting assembly 100 further includes a second telescopic assembly 14, which is capable of driving the lifting arm 200 to rotate between a third position and a fourth position, thereby enabling automatic rotation of the lifting arm 200. The position-limiting support rod and the second telescopic assembly 14 are configured as the same structure. Specifically, the second telescopic assembly 14 includes a second driving member, a first rod 141, and a second rod 142. The first rod 141 is sleeved within the second rod 142. The second driving member is disposed on the support platform 12 and drives the first rod 141 to move along the axis of the second rod 142. In other embodiments, the second telescopic assembly 14 may also include a hydraulic cylinder.

[0043] In one embodiment, the support frame 123 includes two spaced-apart support arms 124, with the lifting arm 200 and the second telescopic assembly 14 both disposed between the two support arms 124. This minimizes energy loss during torque transmission when the second telescopic assembly 14 acts on the lifting arm 200. Furthermore, in the stowed state, the second telescopic assembly 14 can be accommodated between the two support arms 124, further reducing the size of the modified lifting device in the stowed state. The lifting arm 200 is connected to the support arm 124 at its top end. In other embodiments, the lifting arm 200 may be sandwiched between the support frame 123 and the second telescopic assembly 14.

[0044] In one embodiment, the lifting arm 200 includes a lifting rope 23 and a hook 24. The lifting arm 200 is provided with a through hole 25 extending along the thickness direction of the lifting arm 200 and is located at the end of the lifting arm 200 away from the mast 400. The lifting arm 200 includes a mounting surface disposed opposite the abutment surface. A portion of the lifting rope 23 is disposed on the mounting surface. The free end of the lifting rope 23 passes through the through hole 25 from the mounting surface and connects to the hook 24 at the abutment surface. The hoisted material can be hung on the hook 24. In other embodiments, the hook 24 can be omitted, and the free end of the lifting rope 23 can be used to tie the material for lifting and transportation.

[0045] During anchor drilling rig operations, which involve drilling at a certain angle, the modified lifting device will be directly above the operating table of the anchor drilling rig. At this time, if the hook swings, there will be a certain danger to the operator on the operating table.

[0046] In one embodiment, the hook 24 and the free end of the lifting rope 23 are connected by a buffer fixing assembly 300. A rope reel 26 is also provided on the mounting surface. A portion of the lifting rope 23 is wound around the rope reel 26. The rope reel 26 is rotatable to retract and release the lifting rope 23, allowing the hook 24 to have a fifth position and a sixth position. In the fifth position, the hook 24 is close to the through hole 25, and the buffer fixing assembly 300 abuts the through hole 25 to prevent the hook 24 from dangling under the lifting arm 200. In the sixth position, the hook 24 is away from the through hole 25. In other embodiments, the hook 24 can be moved to the fifth position when the operator of the anchor drilling rig is performing complex tasks or when the anchor drilling rig is temporarily shut down to prevent the hook 24 from dangling in mid-air and causing an accident. When the angle of the lifting arm 200 is adjusted or the anchor drilling rig resumes operation, the hook 24 can be moved from the fifth position to the sixth position. In other embodiments, the buffer fixing assembly 300 may not be provided, and the hook 24 can pass through the through hole 25 in the fifth position.

[0047] In one embodiment, the buffer fixing assembly 300 includes a fixing plate 31, an elastic member 32, and an abutment member 33 connected in sequence. The fixing plate 31 is connected to the hook 24. The free end of the lifting rope 23 passes through the abutment member 33 and the elastic member 32 in sequence and is connected to the fixing plate 31. In the fifth position, the abutment member 33 can abut against the end face of the through hole 25. After the hook 24 moves from the sixth position to the fifth position, the abutment member 33 is squeezed by the lifting arm 200 and squeezes the elastic member 32, so that the elastic member 32 is deformed and can buffer the inertia generated during the movement of the hook 24. This prevents the service life of the buffer fixing assembly 300 from being shortened due to multiple impacts of the hook 24 and the lifting arm 200. In other embodiments, the elastic member 32 may not be provided, and the material of the abutment member 33 may be an elastic material.

[0048] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A modified lifting device for an anchor drilling rig, characterized in that: The anchor drilling rig includes a mast extending longitudinally, and the modified lifting device includes: The mounting assembly includes a fixed seat, a support platform, and a first telescopic assembly, wherein the fixed seat is provided on a side of the mast, the support platform is drivingly connected to the first telescopic assembly so as to be slidable longitudinally on the fixed seat and has a first position and a second position, wherein the top end of the support platform in the first position is away from the fixed seat; and The lifting arm has a relative connecting end and a lifting end, the connecting end is rotatably arranged at the top end of the support platform, and has an abutment surface on the peripheral side surface, the modified lifting device has a lifting state and a storage state, in the lifting state, the lifting arm extends horizontally and the abutment surface abuts against the top end surface of the mast, and the support platform is in the first position; in the storage state, the lifting arm extends longitudinally and the top end surface of the lifting end does not exceed the top end surface of the mast, and the support platform is in the second position.

2. The modified lifting device according to claim 1, characterized in that: The first telescopic assembly includes a first driving member, the support platform includes a table plate and two telescopic rods arranged below the table plate, the two telescopic rods are arranged at intervals, the fixed seat includes two sliding grooves arranged relative to the telescopic rods, the first driving member is arranged on the fixed seat and is located between the two sliding grooves, and the driving rod of the first driving member is connected to the table plate, and the telescopic rod can slide longitudinally in the sliding groove.

3. The modified lifting device according to claim 2, characterized in that: The telescopic rod is provided with a limiting protrusion, and the slide groove is provided with a guide hole, which extends longitudinally. The limiting protrusion can move in the guide hole. In the first position, the limiting protrusion abuts against one end of the guide hole close to the lifting arm; in the second position, the limiting protrusion abuts against one end of the guide hole away from the lifting arm.

4. The modified lifting device according to claim 2, characterized in that: The support platform also includes a support frame, which is arranged on the upper side of the table plate. The connection between the lifting arm and the support frame has a rotation axis, and the rotation axis is arranged close to the connection end. The lifting arm rotates around the rotation axis and has a third position and a fourth position. In the third position, the lifting arm rotates to extend laterally and the abutting surface abuts against the top surface of the mast to correspond to the lifting state; in the fourth position, the lifting arm extends longitudinally.

5. The modified lifting device according to claim 4, characterized in that: The mounting assembly also includes a limiting support rod, one end of which is rotatably connected to the table and arranged close to the support frame, and the other end is detachably connected to the connecting end. The support frame extends longitudinally. In the third position, the limiting support rod is connected to the connecting end and extends obliquely in the longitudinal direction away from the mast; in the fourth position, the limiting support rod is detached from the connecting end.

6. The modified lifting device according to claim 5, characterized in that: The mounting assembly further includes a second telescopic assembly, which is capable of driving the hoisting arm to rotate between the third position and the fourth position. The position-limiting support rod and the second telescopic assembly are configured as the same structure.

7. The modified lifting device according to claim 6, characterized in that: The support frame includes two support arms arranged at intervals, the lifting arm and the second telescopic assembly are both arranged between the two support arms, and the lifting arm is connected to the support arm at the top end of the support arm; And / or, the second telescopic assembly includes a second driving member, a first set of rods and a second set of rods, the first set of rods is sleeved on the second set of rods, the second driving member is arranged on the support platform, and drives the first set of rods to move along the axial direction of the second set of rods.

8. The modified lifting device according to claim 1, characterized in that: The lifting arm includes a lifting rope and a hook. The lifting arm is provided with a through hole. The through hole extends along the thickness direction of the lifting arm and is provided at one end of the lifting arm away from the mast. The lifting arm includes a mounting surface arranged opposite to the abutting surface. Part of the lifting rope is arranged on the mounting surface. The free end of the lifting rope passes through the through hole from the mounting surface and is connected to the hook on the abutting surface.

9. The modified lifting device according to claim 8, characterized in that: The hook and the free end of the lifting rope are connected by a buffer fixing assembly, and a rope winding wheel is also provided on the mounting surface. Part of the lifting rope on the mounting surface is wound on the rope winding wheel, and the rope winding wheel can rotate to retract and release the lifting rope so that the hook has a fifth position and a sixth position. In the fifth position, the hook is close to the through hole, and the buffer fixing assembly is in contact with the through hole; in the sixth position, the hook is away from the through hole.

10. The modified lifting device according to claim 9, characterized in that: The buffer fixing assembly includes a fixing plate, an elastic member and an abutment member connected in sequence, the fixing plate is connected to the hook, and the free end of the lifting rope passes through the abutment member and the elastic member in sequence and is connected to the fixing plate.

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