CN220906946U - Lifting tool for marine boiler - Google Patents

Abstract

The utility model belongs to the technical field of marine boilers, and provides a lifting tool of a marine boiler, which comprises the following components: two support frames positioned at two ends of the boiler, wherein the support frames are positioned at the outer side of the boiler; the two support beams are symmetrically arranged between the two support frames, one ends of the two support beams are respectively fixedly arranged with the two support frames, and the other ends of the two support beams are respectively detachably arranged with the two support frames; according to the utility model, the roller A is arranged at the bottom of the support frame, and after the two support frames are mutually disassembled, the roller A at the bottom of the support frame is convenient to move out of the bottom of the boiler, so that the support frame is more convenient and labor-saving to disassemble, the problem that the lifting tool is inconvenient to move and more laborious to disassemble is effectively solved, and the support frame is convenient to disassemble after the boiler is fixedly installed.

Description

Lifting tool for marine boiler

Technical Field

The utility model relates to the field of marine boilers, in particular to a lifting tool of a marine boiler.

Background

The marine boiler is a boiler for supplying steam to a steam power machine for propelling a ship, and structurally, the boiler can adapt to navigation conditions such as ship swinging, tilting, impact and the like; the marine boiler has certain steam and water storage volume to meet the requirement of steam power machine for frequent and great change in load.

In the related art, the marine boiler is easy to be damaged by equipment during integral lifting due to large mass and volume, so that a lifting tool suitable for the marine supercharged boiler is provided in the literature with the prior art publication number of CN208856786U, and the device comprises four lifting arms, two lifting arms are fixedly connected on each bearing bracket, and four supporting beams are adopted; the lifting force directly acts on the base of the bearing bracket through the tool, and in order to strengthen the bearing capacity of the base, the two bases are also fixedly connected through the reinforcing rib plate; the base is of a frame type structure, and a plurality of reinforcing rib plates can be additionally arranged to improve the connection strength, so that the stress of the boiler thin-wall shell is avoided; the hoisting speed is controlled, so that the brick lining of the boiler and the welding and expansion joint parts are not vibrated and impacted, and the integral safety of equipment is protected; in order to adapt to the lifting of a pressurized boiler which is not less than 50t (without the dead weight of the tool), the inclination angle beta of the side arm relative to the base is 60 degrees; the arc surfaces of the side arms are arranged in an inclined manner, so that the matching with the outer arc surface of the supercharged boiler is met, the materials are saved, and the lifting requirement is met; the angle is set, so that the gravity center of the boiler is not deviated in the transportation process, and the safety and reliability of the marine supercharged boiler in the transportation process are ensured, and the damage risk is avoided.

The above-mentioned prior art scheme is through base and can realize the effect of stabilizing the handling to the boiler with two side arms, but need dismantle base and lateral wall after the boiler is installed to be convenient for repeatedly usable, need be located the base and the side arm at the corbel both ends need dismantle when dismantling for base and side arm can be removed from the outside of boiler, because lateral wall and base are steel construction, and quality and volume are great, remove inconveniently when dismantling, comparatively laborious when leading to handling frock to dismantle.

In view of this, we propose a handling frock of marine boiler.

Disclosure of utility model

The lifting tool for the marine boiler is used for solving the technical problem that the lifting tool in the background art is inconvenient to move and laborious to detach, and achieves the technical effect of convenient movement when the lifting tool is detached.

The technical scheme provided by the utility model is as follows: a handling tooling for a marine boiler, comprising:

Two support frames positioned at two ends of the boiler, wherein the support frames are positioned at the outer side of the boiler;

The two support beams are symmetrically arranged between the two support frames, one ends of the two support beams are respectively fixedly arranged with the two support frames, and the other ends of the two support beams are respectively detachably arranged with the two support frames;

The roller A is symmetrically and rotatably arranged at the bottom of the support frame;

The roller B is rotatably arranged at the bottom of the supporting beam;

lifting lugs are symmetrically and fixedly arranged at the top of the supporting frame.

Through adopting above-mentioned technical scheme, when the handling, remove the both ends of boiler with two support frames through gyro wheel A and gyro wheel B, then be close to each other with two support frames, make the corbel of support frame one side insert the inboard of another support frame, make two support frames assemble each other, then with rope and lug interconnect, lift up the support frame through lifting device, make support frame cooperation corbel shift marine boiler, after the boiler shifts fixedly, slowly put down the support frame again, gyro wheel A and gyro wheel B of support frame and corbel bottom have guaranteed stability this moment, prevent support frame and corbel topple over, then keep away from each other with two support frames, make support frame drive corbel and another support frame break away from each other, so that support frame and corbel pass through gyro wheel A and gyro wheel B and move the outside of taking the boiler, the convenience is dismantled support frame and corbel behind boiler fixed mounting.

In a feasible embodiment, the support frame comprises a support, two ends of the support are fixedly provided with side arms, the tops of the side arms are fixedly provided with suspension arms, arc-shaped supporting parts matched with the outer side of the boiler are arranged between the suspension arms and the side arms, lifting lugs are fixedly arranged at the tops of the suspension arms, rollers A are symmetrically arranged at the bottoms of the support, a supporting beam is fixedly arranged at one side of the support, and the other ends of the supporting beam are detachably arranged with another support.

Through adopting above-mentioned technical scheme, support the boiler through the support to protect the outside of boiler through the arc supporting part at both ends, guaranteed the stability of boiler handling in-process, and when dismantling two supports, keep away from each other with the support through gyro wheel A, make the support drive the automatic mutual dismantlement of supporting beam in outside and another support, make the support more convenient laborsaving when shifting out the boiler outside.

In one possible embodiment, a reinforcing arm is fixedly arranged on the outer side of the suspension arm at one end of the support, a slot is formed in the outer side of the suspension arm at the other end of the support, and the reinforcing arm on the outer side of one suspension arm is inserted into the slot on the outer side of the other suspension arm.

Through adopting above-mentioned technical scheme, when the support drives the corbel and the mutual assembly of another support, the support drives simultaneously that the arm that strengthens in the davit outside is pegged graft with in the slot in another davit outside, makes two adjacent davits consolidate through the arm that strengthens in handling, prevents that the davit from taking place to warp and cause the damage to the boiler to dismantle conveniently.

In a feasible embodiment, a roller A is rotatably arranged at the bottom of a support, a wheel frame A is rotatably arranged at the outer side of the roller A, a rotating block A is fixedly arranged at the top of the wheel frame A, the rotating block A is rotatably arranged at the bottom of the support, a locking plate B is fixedly arranged at the outer side of the rotating block A, a bolt A is inserted into the inner side of the locking plate B, a jack A is formed in the inner side of the support corresponding to the bolt A, a locking block A is fixedly arranged at the outer side of the support, and when the roller A is accommodated, the bolt A is inserted into the inner side of the locking block A.

Through adopting above-mentioned technical scheme, when the bottom of boiler is higher apart from ground, the inboard bolt A of jam plate B inserts in jack A's inboard this moment, jam plate B drives rotating block A and makes inboard gyro wheel A of wheel carrier A support to the support, make the support pass through gyro wheel A convenient removal, after the bottom of boiler is removed to the support, with davit and rope interconnect, lift by rope guarantees the stability of support, when the boiler bottom is nearer apart from ground, insert jam plate B inboard bolt A's inboard, jam plate B drives rotating block A and rotates ninety degrees this moment, rotating block A drives gyro wheel A through wheel carrier A and leans on the bottom of support, lower gyro wheel A to the occupation of support bottom space, then through connecting the bottom that the rope removed the support to boiler both ends with the lug, in order to adapt to different service conditions.

In one possible embodiment, the inner side of the support seat is provided with an assembly hole corresponding to one end of the supporting beam, the assembly hole is matched with one end of the supporting beam, and one side of the support seat away from the supporting beam is fixedly provided with a limiting plate corresponding to the assembly hole.

Through adopting above-mentioned technical scheme, when equipment support and corbel, insert the inboard pilot hole of another support with the corbel in one of them support outside, can't continue to insert after the one end of corbel reaches the limiting plate, and then make the corbel between two supports easy to assemble and dismantle.

In one possible embodiment, a lock plate A is fixedly arranged on the outer side of the supporting beam, a jack B and a jack C are formed in the inner side of the lock plate A, a connecting block is fixedly arranged at the bottom of the supporting beam, and a roller B is rotatably arranged on the outer side of the connecting block;

The roller B is rotatably provided with a wheel carrier B outside, the top of the wheel carrier B is fixedly provided with a rotating block B, the rotating block B is rotatably arranged on the outer side of the connecting block, one side, close to the locking plate A, of the wheel carrier B is fixedly provided with a locking block B, a bolt B is inserted into the inner side of the locking block B, the bolt B is inserted into the inner side of the jack C, and when the roller B is accommodated, the bolt B is inserted into the inner side of the jack B.

Through adopting above-mentioned technical scheme, when gyro wheel A drives the support and removes, bolt B inserts in jack C and locking piece B's inboard, and gyro wheel B drives the corbel and removes together with the support this moment, has guaranteed the stability of removal, and when gyro wheel A accomodates, is located the bottom of corbel through rotating gyro wheel B, makes the locking piece B in the wheel carrier B outside align with the inboard jack B of locking plate A, then inserts bolt B and accomodates gyro wheel B with locking piece B's inboard, makes gyro wheel B cooperation gyro wheel A satisfy different user demands.

Compared with the prior art, the utility model has the beneficial effects that:

(1) According to the lifting tool for the marine boiler, the roller A is arranged at the bottom of the supporting frame, and after the two supporting frames are mutually detached, the roller A at the bottom of the supporting frame is convenient to move out of the bottom of the boiler, so that the supporting frame is more convenient and labor-saving to detach, the problem that the lifting tool is inconvenient to move and is more laborious to detach when being detached is effectively solved, and the purpose of conveniently detaching the supporting frame after the boiler is fixedly installed is achieved.

(2) According to the lifting tool for the marine boiler, the supporting beams are arranged between the two supporting frames, one ends of the two supporting beams are respectively fixed with the two supporting frames, and the other ends of the two supporting beams are respectively detached from the two supporting frames, so that the supporting beams can be driven to be detached together when the supporting frames are detached from each other, the stability of the supporting frames and the stability of the supporting beams are ensured through the roller B at the bottom of the supporting beams, the supporting frames and the supporting beams are prevented from being toppled over when the supporting frames and the supporting beams are detached, and the lifting tool is more labor-saving to use.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the handling tool of the present utility model;

FIG. 2 is a schematic view of the structure of the support frame and corbel of the present utility model;

FIG. 3 is a schematic view of the structure of the roller A of the present utility model after being accommodated;

fig. 4 is a schematic structural view of the roller B after being accommodated in the present utility model.

The reference numerals are as follows: 1. the support frame, 11, the support, 111, the pilot hole, 112, the limiting plate, 113, jack A,114, locking piece A,12, side arm, 13, the davit, 131, slot, 132, strengthening arm, 14, arc supporting part, 2, corbel, 21, locking piece A,211, jack B,212, jack C,22, connecting block, 3, gyro wheel A,31, wheel carrier A,32, turning piece A,33, locking piece B,34, bolt A,4, gyro wheel B,41, wheel carrier B,42, turning piece B,43, locking piece B,44, bolt B,5, lug.

Detailed Description

The utility model will be described in further detail below with reference to the drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the application herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In the present utility model, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are only used to better describe the present utility model and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations.

Referring to fig. 1 and 2, the embodiment of the application discloses a lifting tool for a marine boiler, which comprises support frames 1 positioned at the outer sides of two ends of the boiler, wherein one side of each support frame 1 is fixedly provided with a supporting beam 2, each supporting beam 2 is symmetrically arranged between the two support frames 1, the other ends of the two supporting beams 2 are respectively detachably connected with the support frames 1, rollers A3 are symmetrically arranged at the bottoms of the two support frames 1, rollers B4 are arranged at the bottoms of the two supporting beams 2, and lifting lugs 5 for connecting ropes are symmetrically and fixedly arranged at the bottoms of the support frames 1.

When handling, remove the both ends of boiler with two support frames 1 through gyro wheel A3 and gyro wheel B4, then be close to each other with two support frames 1, make the corbel 2 of support frame 1 one side insert the inboard of another support frame 1, make two support frames 1 assemble each other, then with rope and lug 5 interconnect, lift up support frame 1 through lifting by crane equipment, make support frame 1 cooperation corbel 2 shift marine boiler, after the boiler shifts fixedly, slowly put down support frame 1 again, gyro wheel A3 and gyro wheel B4 of support frame 1 and corbel 2 bottom have guaranteed stability this moment, prevent support frame 1 and corbel 2 topple over, then keep away from each other with two support frames 1, make support frame 1 drive corbel 2 and another support frame 1 break away from each other, so that support frame 1 and corbel 2 pass through gyro wheel A3 and gyro wheel B4 and move the outside of taking the boiler, the convenience is dismantled support frame 1 and corbel 2 after boiler fixed mounting.

Referring to fig. 1 and 2, the support frame 1 includes support 11, and support 11 both ends are all fixed and are provided with side arm 12, and side arm 12 top is all fixed and is provided with davit 13, is provided with between davit 13 and the side arm 12 and mutually supports arc supporting part 14 with the boiler outside, and davit 13 top is all fixed and is provided with lug 5, and support 11 bottom is all symmetry and is provided with gyro wheel A3, and support 11 one side is all fixed and is provided with corbel 2, and corbel 2 other end and another support 11 can dismantle the setting.

Support the boiler through support 11 to protect the outside of boiler through the arc supporting part 14 at both ends, guaranteed the stability of boiler handling in-process, and when dismantling two supports 11, keep away from each other with support 11 through gyro wheel A3, make support 11 drive the automatic mutual dismantlement of supporting beam 2 in outside and another support 11, make support 11 more convenient laborsaving when shifting out the boiler outside.

Referring to fig. 1 and 2, a reinforcing arm 132 is fixedly arranged on the outer side of the suspension arm 13 at one end of the support 11, a slot 131 is formed on the outer side of the suspension arm 13 at the other end of the support 11, and the reinforcing arm 132 on the outer side of one suspension arm 13 is inserted into the slot 131 on the outer side of the other suspension arm 13.

When the support 11 drives the corbel 2 to be assembled with another support 11, the support 11 drives the reinforcing arm 132 on the outer side of the suspension arm 13 to be inserted into the slot 131 on the outer side of another suspension arm 13, so that two adjacent suspension arms 13 are reinforced through the reinforcing arm 132 in the lifting process, the suspension arm 13 is prevented from deforming to damage a boiler, and the boiler is convenient to detach.

Referring to fig. 1 and 3, a roller A3 is rotatably disposed at the bottom of a support 11, a wheel frame a31 is rotatably disposed at the outer side of the roller A3, a rotating block a32 is fixedly disposed at the top of the wheel frame a31, the rotating block a32 is rotatably disposed at the bottom of the support 11, a locking plate B33 is fixedly disposed at the outer side of the rotating block a32, a bolt a34 is inserted into the inner side of the locking plate B33, an insertion hole a113 is formed in the inner side of the support 11 corresponding to the bolt a34, a locking block a114 is fixedly disposed at the outer side of the support 11, and when the roller A3 is accommodated, the bolt a34 is inserted into the inner side of the locking block a 114.

When the bottom of the boiler is higher from the ground, the bolt A34 on the inner side of the lock plate B33 is inserted on the inner side of the insertion hole A113, the lock plate B33 drives the rotating block A32 to enable the roller A3 on the inner side of the wheel frame A31 to support the support 11, the support 11 is enabled to conveniently move through the roller A3, after the support 11 moves to the bottom of the boiler, the suspension arm 13 is connected with a rope, the stability of the support 11 is guaranteed through the rope hoisting, when the bottom of the boiler is closer to the ground, the bolt A34 on the inner side of the lock plate B33 is inserted on the inner side of the lock block A114, at the moment, the lock plate B33 drives the rotating block A32 to rotate ninety degrees, the rotating block A32 drives the roller A3 to lean against the bottom of the support 11 through the wheel frame A31, occupation of the space on the bottom of the support 11 by the roller A3 is reduced, and then the support 11 is moved to the bottoms of two ends of the boiler through connecting the rope by the lifting lug 5, so that different use conditions can be adapted.

Referring to fig. 2 and 3, an assembly hole 111 is formed in the inner side of the support 11 corresponding to one end of the supporting beam 2, the assembly hole 111 is matched with one end of the supporting beam 2, and a limiting plate 112 is fixedly arranged on one side, away from the supporting beam 2, of the support 11 corresponding to the assembly hole 111.

When the support 11 and the support beams 2 are assembled, the support beam 2 outside one support 11 is inserted into the assembly hole 111 inside the other support 11, and when one end of the support beam 2 reaches the limit plate 112, the support beam 2 between the two supports 11 cannot be inserted continuously, so that the support beams 2 between the two supports 11 are convenient to install and detach.

Referring to fig. 2 and 4, a lock plate a21 is fixedly arranged on the outer side of the supporting beam 2, an insertion hole B211 and an insertion hole C212 are formed in the inner side of the lock plate a21, a connecting block 22 is fixedly arranged at the bottom of the supporting beam 2, and a roller B4 is rotatably arranged on the outer side of the connecting block 22;

The roller B4 is provided with a wheel carrier B41 in a rotating mode, a rotating block B42 is fixedly arranged at the top of the wheel carrier B41, the rotating block B42 is arranged on the outer side of the connecting block 22 in a rotating mode, a locking block B43 is fixedly arranged on one side, close to the locking plate A21, of the wheel carrier B41, a plug pin B44 is inserted into the inner side of the locking block B43, the plug pin B44 is inserted into the inner side of the jack C212, and when the roller B4 is stored, the plug pin B44 is inserted into the inner side of the jack B211.

When the roller A3 drives the support 11 to move, the bolt B44 is inserted into the inner sides of the insertion hole C212 and the locking block B43, and at the moment, the roller B4 drives the supporting beam 2 to move together with the support 11, so that the moving stability is guaranteed, when the roller A3 is stored, the locking block B43 on the outer side of the wheel frame B41 is aligned with the insertion hole B211 on the inner side of the locking plate A21 by rotating the bottom of the supporting beam 2, and then the bolt B44 is inserted into the insertion hole B211 and the inner side of the locking block B43 to store the roller B4, so that the roller B4 is matched with the roller A3 to meet different use requirements.

In view of the above, when the lifting tool of the marine boiler disclosed in the embodiment of the application is used, if the bottom of the boiler is higher from the ground, the bolt a34 on the inner side of the lock plate B33 is inserted into the inner side of the insertion hole a113, the lock plate B33 drives the rotating block a32 to enable the roller A3 on the inner side of the wheel frame a31 to support the support 11, the support 11 is enabled to conveniently move through the roller A3, the bolt B44 is inserted into the inner side of the insertion hole C212 and the lock block B43, the roller B4 drives the corbel 2 to move together with the support 11, the stability of movement is ensured, after the support 11 moves to the bottom of the boiler, the corbel 2 on the outer side of one support 11 is inserted into the assembly hole 111 on the inner side of the other support 11 by mutually approaching the two supports 11, when one end of the corbel 2 reaches the limiting plate 112, and when the support 11 drives the corbel 2 to be mutually assembled with the other support 11, the support 11 drives the reinforcing arm 132 on the outer side of the boom 13 to be inserted into the insertion hole 131 on the outer side of the other support 13, and the two adjacent booms 13 are reinforced through the reinforcing arm 132 in the lifting process, and finally, the rope and the rope is connected with the boom 11 through the rope to ensure stability;

If the bottom of the boiler is closer to the ground, the bolt A34 on the inner side of the lock plate B33 is inserted into the inner side of the lock block A114, at this time, the lock plate B33 drives the rotating block A32 to rotate ninety degrees, the rotating block A32 drives the roller A3 to lean against the bottom of the support 11 through the wheel frame A31, the occupation of the roller A3 to the bottom space of the support 11 is low, the lock block B43 on the outer side of the wheel frame B41 is aligned with the jack B211 on the inner side of the lock plate A21 through rotating the roller B4, then the bolt B44 is inserted into the jack B211 and the inner side of the lock block B43 to store the roller B4, the roller B4 is matched with the roller A3 to meet different use requirements, then the lifting lug 5 is connected with the rope to move the support 11 to the lower sides of the two supports 11 to mutually assemble in the lifting process, and the support 11 is slowly lifted to be positioned at the bottom of the boiler after the assembly.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (6)

1. The utility model provides a handling frock of marine boiler which characterized in that includes:

two support frames (1) positioned at two ends of the boiler, wherein the support frames (1) are positioned at the outer side of the boiler;

The two support beams (2) are symmetrically arranged between the two support frames (1), one ends of the two support beams (2) are respectively fixedly arranged with the two support frames (1), and the other ends of the two support beams are respectively detachably arranged with the two support frames (1);

The roller A (3) is symmetrically and rotatably arranged at the bottom of the support frame (1);

the roller B (4) is rotatably arranged at the bottom of the supporting beam (2);

Lifting lugs (5), the lifting lugs (5) are symmetrically and fixedly arranged at the top of the supporting frame (1).

2. The lifting tool for the marine boiler according to claim 1, wherein the supporting frame (1) comprises a supporting seat (11), side arms (12) are fixedly arranged at two ends of the supporting seat (11), a suspension arm (13) is fixedly arranged at the top of each side arm (12), an arc-shaped supporting part (14) matched with the outer side of the boiler is arranged between each suspension arm (13) and each side arm (12), lifting lugs (5) are fixedly arranged at the top of each suspension arm (13), rollers A (3) are symmetrically arranged at the bottom of the supporting seat (11), a supporting beam (2) is fixedly arranged at one side of the supporting seat (11), and the other end of the supporting beam (2) is detachably arranged with the other supporting seat (11).

3. The lifting tool of a marine boiler according to claim 2, wherein a reinforcing arm (132) is fixedly arranged on the outer side of the suspension arm (13) at one end of the support (11), a slot (131) is formed on the outer side of the suspension arm (13) at the other end of the support (11), and the reinforcing arm (132) on the outer side of one suspension arm (13) is in plug-in connection with the slot (131) on the outer side of the other suspension arm (13).

4. A lifting tool for a marine boiler according to claim 3, wherein a roller a (3) is rotatably arranged at the bottom of the support (11), a wheel frame a (31) is rotatably arranged at the outer side of the roller a (3), a rotating block a (32) is fixedly arranged at the top of the wheel frame a (31), the rotating block a (32) is rotatably arranged at the bottom of the support (11), a locking plate B (33) is fixedly arranged at the outer side of the rotating block a (32), a plug a (34) is inserted into the inner side of the locking plate B (33), a plug a (113) is formed in the inner side of the support (11) corresponding to the plug a (34), a locking block a (114) is fixedly arranged at the outer side of the support (11), and the plug a (34) is inserted into the inner side of the locking block a (114) when the roller a (3) is accommodated.

5. The lifting tool of a marine boiler according to claim 4, wherein an assembly hole (111) is formed in the inner side of the support (11) corresponding to one end of the supporting beam (2), the assembly hole (111) is matched with one end of the supporting beam (2), and a limiting plate (112) is fixedly arranged on one side, away from the supporting beam (2), of the support (11) corresponding to the assembly hole (111).

6. The lifting tool for the marine boiler according to claim 5, wherein a locking plate A (21) is fixedly arranged on the outer side of the supporting beam (2), an inserting hole B (211) and an inserting hole C (212) are formed in the inner side of the locking plate A (21), a connecting block (22) is fixedly arranged at the bottom of the supporting beam (2), and a roller B (4) is rotatably arranged on the outer side of the connecting block (22);

The roller B (4) is provided with a wheel carrier B (41) in a rotating mode, a rotating block B (42) is fixedly arranged at the top of the wheel carrier B (41), the rotating block B (42) is rotatably arranged on the outer side of the connecting block (22), a locking block B (43) is fixedly arranged on one side, close to the locking plate A (21), of the wheel carrier B (41), a bolt B (44) is inserted into the inner side of the locking block B (43), the bolt B (44) is inserted into the inner side of the jack C (212), and when the roller B (4) is stored, the bolt B (44) is inserted into the inner side of the jack B (211).