CN218491247U - Manually adjusted multifunctional roller lifting appliance - Google Patents

Abstract

The utility model discloses a manually adjusted multifunctional roller hanger, which comprises a hoisting mechanism, wherein the top end of the hoisting mechanism is fixedly installed with a suspension arm mechanism of a travelling crane; the clamp tongue mechanism is fixedly arranged on the hoisting mechanism and used for hoisting the upper supporting roller; the clamp tongue mechanism comprises two symmetrically arranged clamp tongue components and is detachably connected with the two sides of the upper supporting roller; the hoisting block mechanism is arranged on the hoisting mechanism and used for hoisting the lower supporting roller; the hoisting block mechanism comprises two symmetrically arranged hoisting block assemblies, and the hoisting block assemblies are detachably connected with the lower support roller; the chain wheel adjusting mechanism comprises two chain wheel assemblies symmetrically arranged on the hoisting mechanism, and the chain wheel assemblies are in transmission connection with the hoisting block assemblies. The utility model overcomes among the prior art the operation is dangerous high, and hoist and mount need change the hoist, and is inefficient, and need the people to carry out the limitation of hoist and mount to pit cooperation installation hoist during hoist and mount, has improved hoist and mount efficiency, has guaranteed personal safety, has reduced the cost of labor.

Description

Manually adjusted multifunctional roller lifting appliance

Technical Field

The utility model relates to a jacking equipment technical field especially relates to a multi-functional roll hoist of manual regulation.

Background

After the supporting roller in the steel plate line of the steel mill continuous casting and rolling production line is used for a long time, in order to ensure the requirement of surface roughness of the produced steel plate, the supporting roller needs to be detached on a station, the roller surface is subjected to roller grinding operation, and the supporting roller is installed on the original station after reaching the precision requirement, so that the production line can normally produce the qualified steel plate. The supporting roll is heavy in assembly dead weight and large in appearance, the traditional design of the lifting appliance is that an upper roll and a lower roll are provided with two independent lifting appliances, the lifting appliances need to be repeatedly replaced when the rolls are replaced, the labor cost is increased, and the production efficiency is reduced. Because of the production requirement, the lower supporting roller is assembled in a pit with the depth of three meters, and a lifting tool needs to be installed by people from below during lifting, so that the lifting risk is increased, and the efficiency is low. Therefore, the multifunctional roller lifting appliance with manual adjustment needs to be researched and developed, and the requirements of safer operation and quicker replacement are met.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a manually regulated's multi-functional roll hoist to solve the problem that above-mentioned prior art exists.

In order to achieve the above purpose, the utility model provides a following scheme: the utility model provides a manually adjusted's multi-functional roll hoist, include:

the top end of the hoisting mechanism is fixedly installed with a suspension arm mechanism of the travelling crane and is used for hoisting;

the clamp tongue mechanism is fixedly arranged on the hoisting mechanism and is used for hoisting the upper supporting roller; the clamp tongue mechanism comprises two clamp tongue components which are symmetrically arranged, the clamp tongue components are rotationally connected to the hoisting mechanism, and the clamp tongue mechanism is detachably connected with two sides of the upper supporting roller;

the hoisting block mechanism is arranged on the hoisting mechanism and used for hoisting the lower supporting roller; the hoisting block mechanism comprises two symmetrically arranged hoisting block assemblies, the hoisting block assemblies are fixedly arranged on the hoisting mechanism, and the hoisting block assemblies are detachably connected with the lower support roller;

a sprocket adjustment mechanism; the chain wheel adjusting mechanism comprises two chain wheel assemblies symmetrically arranged on the hoisting mechanism, and the chain wheel assemblies are in transmission connection with the hoisting block assemblies.

Preferably, the hoisting mechanism comprises a hoisting beam fixedly installed at the bottom end of the hoisting arm mechanism, two ends of the hoisting beam are respectively provided with a supporting leg, the two supporting legs are symmetrically arranged, and the distance between the two supporting legs is matched with the lengths of the upper supporting roller and the lower supporting roller; the clamp tongue assembly, the hoisting block assembly and the chain wheel assembly are respectively installed on the supporting legs.

Preferably, the nipper assembly comprises a rotating shaft which is rotatably connected to the supporting legs, a nipper plate is fixedly sleeved on the rotating shaft and extends out of the side walls opposite to the two supporting legs, and the nipper plate is detachably connected with the upper supporting roller.

Preferably, a copper sleeve is arranged between the tonque grip and the rotating shaft; the two ends of the rotating shaft are fixedly arranged on the supporting legs through circular clamping structures, and the rotating shaft is rotatably connected with the circular clamping structures.

Preferably, the hoisting block assembly comprises hoisting blocks in sliding connection with the supporting legs, and the hoisting blocks extend out from one sides opposite to the two supporting legs and are detachably connected with the lower supporting roller; and one ends of the hoisting blocks, which are far away from each other, are respectively in threaded connection with a lead screw, and one ends of the lead screws, which are far away from the hoisting blocks, extend out of the supporting legs and are in transmission connection with the sprocket assembly.

Preferably, a guide nut is embedded in the hoisting block and is connected to the screw rod in a sliding manner; and one end of the screw rod, which is positioned in the hoisting block, is provided with an anti-falling part.

Preferably, the outer wall cover of lead screw establishes the rigid coupling and is equipped with the bearing, the outer wall cover of bearing establishes the rigid coupling and is equipped with fixed lid, fixed lid fixed mounting in the landing leg lateral wall.

Preferably, the chain wheel assembly comprises an upper chain wheel and a lower chain wheel which are correspondingly arranged up and down; the upper chain wheel is rotatably connected to the supporting leg, and the lower chain wheel is sleeved at one end of the screw rod, which is far away from the hoisting block; the upper chain wheel is in transmission connection with the lower chain wheel through a chain.

Preferably, the supporting legs are provided with chain wheel fixing pieces, and the upper chain wheel is rotationally connected to the chain wheel fixing pieces; the chain wheel fixing part is provided with a jacking structure, and the jacking structure is detachably connected with the upper chain wheel.

The utility model discloses a following technological effect: the utility model discloses a manually-adjusted multifunctional roll lifting appliance, which mainly aims to overcome the limitations that the operation danger is high, the lifting appliance needs to be replaced when two types of supporting rolls are lifted, the efficiency is low, and meanwhile, people need to cooperate with a pit to install the lifting appliance for lifting when the lower supporting roll is lifted; the clamp tongue mechanism is clamped and separated from the upper supporting roller through the movement of the hoisting mechanism, and the hoisting work of the upper supporting roller is completed; when the lower supporting roll is hoisted, the chain wheel component of the chain wheel adjusting mechanism drives the hoisting block mechanism to be detachably connected with the lower supporting roll, and the automatic separation effect of the hoisting block component is realized after hoisting, so that the lower supporting roll realizes the installation and disassembly of the lower supporting roll assembly function in the pit in the assembly stage, workers are not needed to install and disassemble the hoisting block in the pit, the hoisting efficiency is improved, the personal safety is ensured, and the labor cost is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a three-view diagram of the manually adjustable multifunctional roll sling of the present invention;

FIG. 2 is a schematic view of the upper supporting roller for hoisting of the utility model;

FIG. 3 is a schematic view of the lower supporting roll of the utility model;

FIG. 4 is a schematic view of the lower support roller in the hoisting pit of the utility model;

FIG. 5 is a schematic structural view of the latch mechanism of the present invention;

FIG. 6 is a schematic structural view of the hoisting block mechanism of the present invention;

FIG. 7 is a schematic view of the structure of the sprocket adjusting mechanism of the present invention;

wherein, 1, a suspension arm mechanism; 2. a hoisting mechanism; 3. a clamp tongue mechanism; 4. a hoisting block mechanism; 5. a sprocket adjustment mechanism; 6. an upper support roller; 7. a lower support roller; 21. a hoisting beam; 22. a support leg; 31. a rotating shaft; 32. a tonque plate; 33. a copper sleeve; 34. a circular card structure; 41. hoisting the blocks; 42. a lead screw; 43. a guide nut; 44. a drop-off prevention member; 45. a bearing; 46. a fixed cover; 51. an upper sprocket; 52. a lower sprocket; 53. a chain; 54. a sprocket fixing member; 55. and (5) a jacking structure.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the following detailed description.

Referring to fig. 1-7, the utility model provides a manually adjusted multifunctional roll hoist, include:

the top end of the hoisting mechanism 2 is fixedly arranged with the crane jib mechanism 1 of the crane and is used for hoisting;

the clamp tongue mechanism 3 is fixedly arranged on the hoisting mechanism 2 and is used for hoisting the upper supporting roller 6; the clamp tongue mechanism 3 comprises two symmetrically arranged clamp tongue components, the clamp tongue components are rotationally connected to the hoisting mechanism 2, and the clamp tongue mechanism 3 is detachably connected with two sides of the upper supporting roller 6;

the hoisting block mechanism 4 is arranged on the hoisting mechanism 2 and used for hoisting the lower supporting roll 7; the hoisting block mechanism 4 comprises two symmetrically arranged hoisting block assemblies, the hoisting block assemblies are fixedly arranged on the hoisting mechanism 2, and the hoisting block assemblies are detachably connected with the lower support roller 7;

a sprocket adjusting mechanism 5; the chain wheel adjusting mechanism 5 comprises two chain wheel assemblies symmetrically arranged on the hoisting mechanism 2, and the chain wheel assemblies are in transmission connection with the hoisting block assemblies.

The utility model discloses a manually-adjusted multifunctional roll hanger, which mainly aims to overcome the defects that the operation danger is high, the hanger needs to be replaced when two types of supporting rolls are hoisted, the efficiency is low, and meanwhile, people need to go to a pit to be matched with the hanger for installing the hanger for hoisting; the clamp tongue mechanism 3 is clamped and separated with the upper supporting roller 6 through the movement of the hoisting mechanism 2, and the hoisting work of the upper supporting roller 6 is completed; when the lower supporting roll 7 is hoisted, the chain wheel assembly of the chain wheel adjusting mechanism 5 drives the hoisting block mechanism 4 to be detachably connected with the lower supporting roll 7, and the automatic separation effect of the hoisting block assembly is realized after hoisting, so that the lower supporting roll 7 is assembled and disassembled in a pit in the assembling stage, the assembling function of the lower supporting roll 7 is realized, workers are not needed to assemble and disassemble the hoisting block 41 in the pit, the hoisting efficiency is improved, the personal safety is ensured, and the labor cost is reduced.

According to a further optimized scheme, the hoisting mechanism 2 comprises a hoisting beam fixedly mounted at the bottom end of the hoisting arm mechanism, two ends of the hoisting beam 21 are respectively provided with supporting legs 22, the two supporting legs 22 are symmetrically arranged, and the distance between the two supporting legs 22 is matched with the lengths of the upper supporting roller 6 and the lower supporting roller 7; the tong tongue assembly, the lifting block assembly and the sprocket assembly are respectively mounted on the legs 22. The top end of the hanging beam 21 is connected with a hanging arm mechanism 1 of the travelling crane to hoist an object; the lifting appliance is used for lifting the supporting roller in the steel plate line of the steel mill continuous casting and rolling production line, so that the distance between the two supporting legs 22 is matched with the quotient of the supporting roller, and the lifting is convenient; the two tong tongue components are symmetrically arranged on the opposite surfaces of the two supporting legs 22 respectively and are used for hoisting the upper supporting roller 6; the two hoisting block assemblies are also respectively arranged on the opposite surfaces of the two supporting legs 22 and are used for hoisting the lower supporting roller 7; two chain wheel assemblies are also respectively arranged on the two supporting legs 22 and used for controlling the hoisting block assembly to hoist the lower supporting roller 7.

According to a further optimized scheme, the clamp tongue assembly comprises a rotating shaft 31 which is rotatably connected to the supporting legs 22, a clamp tongue plate 32 is fixedly sleeved on the rotating shaft 31, the clamp tongue plate 32 extends out of the side wall of each supporting leg 22, and the clamp tongue plate 32 is detachably connected with the upper supporting roller 6; a copper sleeve 33 is arranged between the tonque grip 32 and the rotating shaft 31; the two ends of the rotating shaft 31 are fixedly mounted on the supporting legs 22 through the circular clamping structures 34, and the rotating shaft 31 is rotatably connected with the circular clamping structures 34. When the upper supporting roller 6 is hoisted, a worker controls the crane boom mechanism 1 to move above the upper supporting roller 6, so that the upper supporting roller 6 is positioned between the two supporting legs 22, then the crane boom mechanism 1 is controlled to descend, and in the descending process of the supporting legs 22, the cover plate structure of the upper supporting roller 6 contacts the tongue clamping plate 32 firstly, so that the tongue clamping plate 32 is turned upwards by taking the rotating shaft 31 as an axial direction to enter the groove in the supporting legs 22 and is propped against the groove and can not rotate; the supporting legs 22 continuously descend until the hoisting grooves of the cover plates are aligned with the clamp tongue plates 32, the clamp tongue plates 32 rotate and are leveled under the action of gravity and clamped into the hoisting grooves, the supporting legs 22 are lifted at the moment, and the upper supporting rollers 6 are driven by the clamp tongue plates 32 to be hoisted; when the pliers are required to be released, the upper supporting roller 6 is placed at a specified position for stable supporting, then the supporting leg 22 is moved downwards continuously, the bottom edge of the pliers tongue plate 32 is in contact with the bottom edge of the hoisting groove, the pliers tongue plate is pushed by the bottom edge of the hoisting groove to turn upwards again to enter the groove and be separated from the upper supporting roller 6, the supporting leg 22 is translated at the moment, and the two supporting legs 22 are separated from the upper supporting roller 6 to complete separation without manual separation.

Further, the tonque tongue plate 32 is in a horizontal state in a free state, the bottom edge of the tonque tongue plate is arc-shaped, and when the tonque tongue plate is hoisted, the cover plate of the upper supporting roller 6 is in contact with the bottom edge of the tonque tongue plate 32 and pushes the tonque tongue plate 32 to turn over; after being turned over, the cover plate is constructed to abut against the legs 22 and prevent the rotation of the tonque plate 32 until it is aligned with the lifting slot.

According to a further optimized scheme, the hoisting block assembly comprises hoisting blocks 41 in sliding connection with the supporting legs 22, and the hoisting blocks 41 extend out from one sides, opposite to the two supporting legs 22, and are detachably connected with the lower supporting roller 7; one ends of the two hoisting blocks 41, which are far away from each other, are respectively in threaded connection with a lead screw 42, and one ends of the lead screws 42, which are far away from the hoisting blocks 41, extend out of the supporting legs 22 and are in transmission connection with the chain wheel assembly; a guide nut 43 is embedded in the hoisting block 41, and the guide nut 43 is connected to the screw rod 42 in a sliding manner; one end of the screw rod 42 positioned in the hoisting block 41 is provided with an anti-falling piece 44; the outer wall of the screw rod 42 is sleeved and fixedly connected with a bearing 45, the outer wall of the bearing 45 is sleeved and fixedly connected with a fixed cover 46, and the fixed cover 46 is fixedly installed on the side wall of the supporting leg 22. When the lower supporting roller 7 is hoisted, the two supporting legs are moved above the lower supporting roller 7, then the supporting legs 22 are lowered, and the tongue tong plate 32 is pushed back into the groove by the lower supporting roller 7, so that hoisting is not influenced; after the hoisting groove of the lower supporting roller 7 is aligned with the hoisting block 41, the chain wheel assembly drives the screw rod 42 to rotate, so that the hoisting block 41 moves towards the lower supporting roller 7 and is clamped into the hoisting groove, and then the lower supporting roller 7 can be hoisted by lifting the supporting legs 22; when the lower supporting roller 7 needs to be loosened in the pit, the lower supporting roller 7 is firstly grounded, then the screw rod 42 is controlled to rotate reversely through the chain wheel assembly, the hoisting block 41 is retracted into the supporting leg 22, the supporting leg 22 is separated from the lower supporting roller 7, workers do not need to enter the pit in the hoisting process, the hoisting efficiency is improved, and the hoisting danger is reduced.

In a further optimized scheme, the chain wheel assembly comprises an upper chain wheel 51 and a lower chain wheel 52 which are correspondingly arranged up and down; the upper chain wheel 51 is rotationally connected to the supporting leg 22, and the lower chain wheel 52 is sleeved at one end of the screw rod 42 far away from the hoisting block 41; the upper chain wheel 51 is in transmission connection with the lower chain wheel 52 through a chain 53; a chain wheel fixing piece 54 is arranged on the supporting leg 22, and the upper chain wheel 51 is rotationally connected to the chain wheel fixing piece 54; the chain wheel fixing piece 54 is provided with a jacking structure 55, and the jacking structure 55 is detachably connected with the upper chain wheel 51. The upper chain wheel 51 is in transmission connection with a power source (not shown in the figure), the chain 53 drives the lower chain wheel 52 to rotate, and the rotation of the screw rod 42 is controlled to move the hoisting block 41 so as to clamp and separate the hoisting block from the lower support roller 7; the tight structure 55 in top is used for locking going up chain wheel 51, prevents the rotatory hoist and mount error that leads to of hoist and mount in-process going up chain wheel 51, improves the security.

The using method comprises the following steps:

the lifting appliance needs to be matched with a conventional travelling crane for use, and the lifting beam 21 is arranged below a lifting arm mechanism 1 of the travelling crane;

when the upper supporting roller 6 is hoisted, the boom mechanism 1 moves to the position above the upper supporting roller 6, then the boom mechanism 1 is controlled to descend, the cover plate structure of the upper supporting roller 6 pushes the nipper plate 32 to turn upwards and enter the groove in the supporting leg 22 until the hoisting groove of the upper supporting roller 6 is aligned with the nipper plate 32, the nipper plate 32 rotates and is laid flat under the action of gravity, the nipper plate is clamped into the hoisting groove, and the supporting leg 22 is lifted, so that the upper supporting roller 6 can be hoisted; when the support device needs to be released, the upper support roller 6 is placed at a specified position for stable support, then the support legs 22 are continuously moved downwards, the clamp tongue plate 32 is pushed by the bottom edge of the hoisting groove to turn upwards again to enter the groove and be separated from the upper support roller 6, and at the moment, the support legs 22 are translated to enable the two support legs 22 to be separated from the upper support roller 6, so that separation is completed;

when the lower supporting roller 7 is hoisted, the two supporting legs are moved above the lower supporting roller 7, then the supporting legs 22 are lowered, after a hoisting groove of the lower supporting roller 7 is aligned with the hoisting block 41, the chain wheel assembly drives the screw rod 42 to rotate, so that the hoisting block 41 moves towards the lower supporting roller 7 and is clamped into the hoisting groove, the upper chain wheel 51 is clamped through the jacking structure 55, and then the supporting legs 22 are raised, so that the lower supporting roller 7 can be hoisted; when the lower supporting roller 7 needs to be loosened in the pit, the lower supporting roller 7 is firstly grounded, then the tightening structure 55 is loosened, the screw rod 42 is controlled to rotate reversely through the chain wheel assembly, the hoisting block 41 is retracted into the supporting leg 22, and the supporting leg 22 is separated from the lower supporting roller 7.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description of the present invention, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

The above embodiments are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims (9)

1. The utility model provides a multi-functional roll hoist of manual regulation which characterized in that includes:

the top end of the hoisting mechanism (2) is fixedly arranged with the crane jib mechanism (1) of the travelling crane and is used for hoisting;

the clamp tongue mechanism (3) is fixedly arranged on the hoisting mechanism (2) and is used for hoisting the upper supporting roller (6); the clamp tongue mechanism (3) comprises two symmetrically arranged clamp tongue components, the clamp tongue components are rotationally connected to the hoisting mechanism (2), and the clamp tongue mechanism (3) is detachably connected with two sides of the upper supporting roller (6);

the hoisting block mechanism (4) is installed on the hoisting mechanism (2) and used for hoisting a lower supporting roller (7); the hoisting block mechanism (4) comprises two symmetrically arranged hoisting block assemblies, the hoisting block assemblies are fixedly arranged on the hoisting mechanism (2), and the hoisting block assemblies are detachably connected with the lower supporting roll (7);

a sprocket adjusting mechanism (5); sprocket adjustment mechanism (5) include that two symmetries are installed sprocket assembly on hoisting machine constructs (2), sprocket assembly with hoist and mount block subassembly transmission is connected.

2. The manually adjustable multifunctional roll spreader according to claim 1, characterized in that: the hoisting mechanism (2) comprises a hoisting beam (21) fixedly mounted at the bottom end of the hoisting arm mechanism (1), two ends of the hoisting beam (21) are respectively provided with supporting legs (22), the two supporting legs (22) are symmetrically arranged, and the distance between the two supporting legs (22) is matched with the lengths of the upper supporting roller (6) and the lower supporting roller (7); the clamp tongue assembly, the lifting block assembly and the chain wheel assembly are respectively arranged on the supporting leg (22).

3. The manually adjusted multifunctional roll spreader according to claim 2, characterized in that: the tong tongue component comprises a rotating shaft (31) which is rotatably connected to the supporting legs (22), a tong tongue plate (32) is fixedly connected to the rotating shaft (31) in a sleeved mode, the tong tongue plate (32) extends out of the two opposite side walls of the supporting legs (22), and the tong tongue plate (32) is detachably connected with the upper supporting roller (6).

4. The manually adjustable multifunctional roll spreader according to claim 3, characterized in that: a copper sleeve (33) is arranged between the tonque tongue plate (32) and the rotating shaft (31); the both ends of pivot (31) are passed through circle card structure (34) fixed mounting and are in on landing leg (22), pivot (31) with circle card structure (34) rotate to be connected.

5. The manually adjusted multi-function roll spreader according to claim 2, characterized in that: the hoisting block assembly comprises hoisting blocks (41) which are in sliding connection with the supporting legs (22), and the hoisting blocks (41) extend out from one sides of the two supporting legs (22) and are detachably connected with the lower supporting roller (7); two the one end that hoist and mount piece (41) kept away from each other has lead screw (42) respectively threaded connection, lead screw (42) are kept away from the one end of hoist and mount piece (41) stretches out landing leg (22) and with sprocket assembly transmission is connected.

6. The manually adjustable multi-function roll spreader according to claim 5, characterized in that: a guide nut (43) is embedded in the hoisting block (41), and the guide nut (43) is connected to the lead screw (42) in a sliding manner; and one end of the screw rod (42) positioned in the hoisting block (41) is provided with an anti-falling part (44).

7. The manually adjustable multi-function roll spreader according to claim 5, wherein: the rigid coupling is established to the outer wall cover of lead screw (42) and is equipped with bearing (45), the rigid coupling is established to the outer wall cover of bearing (45) and is equipped with fixed lid (46), fixed lid (46) fixed mounting in landing leg (22) lateral wall.

8. The manually adjustable multi-function roll spreader according to claim 5, wherein: the chain wheel component comprises an upper chain wheel (51) and a lower chain wheel (52) which are arranged up and down correspondingly; the upper chain wheel (51) is rotationally connected to the supporting leg (22), and the lower chain wheel (52) is sleeved at one end, far away from the hoisting block (41), of the lead screw (42); the upper chain wheel (51) is in transmission connection with the lower chain wheel (52) through a chain (53).

9. The manually adjustable multi-function roll spreader according to claim 8, characterized in that: a chain wheel fixing piece (54) is arranged on the supporting leg (22), and the upper chain wheel (51) is rotationally connected to the chain wheel fixing piece (54); the chain wheel fixing piece (54) is provided with a jacking structure (55), and the jacking structure (55) is detachably connected with the upper chain wheel (51).

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