CN217620437U - Workbench for overhauling centrifugal pump - Google Patents

Abstract

A workbench for overhauling a centrifugal pump comprises a platform, a first overhauling frame and a second overhauling frame, wherein the platform is provided with an upward table top; the first maintenance frame is arranged on the table top of the platform, the side wall of the first maintenance frame is provided with a first socket for the first end part of the centrifugal pump to horizontally extend into, and the edge of the first socket is provided with a first supporting part for restraining a first flange on the centrifugal pump on the first supporting part; the second maintenance frame is arranged on the table top of the platform, the top wall of the second maintenance frame is provided with a second socket for the first end part of the centrifugal pump to downwards extend into, and the edge of the second socket is provided with a second supporting part for restraining the first flange on the centrifugal pump on the second supporting part. Compared with the prior art, this application can improve the maintenance efficiency of centrifugal pump.

Description

Workbench for overhauling centrifugal pump

Technical Field

The utility model belongs to the technical field of the centrifugal pump overhauls, concretely relates to a workstation for overhauing centrifugal pump.

Background

The centrifugal pump is a pump for conveying liquid by centrifugal force generated when an impeller rotates, and mainly comprises a pump shell, an impeller, a pump shaft, a bearing, a coupling and the like. After the centrifugal pump is used for a period of time, the parts in the centrifugal pump need to be disassembled and assembled for maintenance.

Because there are safety, machines, efficiency scheduling problem in the field overhaul, current centrifugal pump mostly draws back the factory building to overhaul, and the factory building is overhauld in quality, normalization etc. relatively better control. But the following problems exist in the workshop overhaul: 1. when a factory building is overhauled, the centrifugal pump is basically or directly placed on the ground for overhauling, a uniform overhauling platform is lacked, a tool needs to be manufactured again when overhauling is carried out, the universality is lacked, and the overhauling efficiency is influenced; 2. when the maintenance is carried out on the ground, the maintainers squat on the ground for a long time, which is not good for health and affects the maintenance quality.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that to prior art's current situation, provide a workstation for overhauing centrifugal pump to improve maintenance efficiency and quality.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: a workbench for overhauling a centrifugal pump is provided with a first end part and a second end part which are opposite along the extension direction of a pump shaft of the centrifugal pump, wherein a first flange is arranged on the peripheral wall of a pump shell of the centrifugal pump and is adjacent to the first end part of the centrifugal pump;

it is characterized in that the workbench comprises:

a platform having an upwardly facing deck;

the first maintenance frame is arranged on the table top of the platform, the side wall of the first maintenance frame is provided with a first socket for the first end part of the centrifugal pump to horizontally extend into, and the edge of the first socket is provided with a first supporting part for restraining a first flange on the centrifugal pump on the first supporting part;

and the second maintenance frame is arranged on the table top of the platform, the top wall of the second maintenance frame is provided with a second socket for the first end part of the centrifugal pump to downwards extend into, and the edge of the second socket is provided with a second supporting part for restraining the first flange on the centrifugal pump on the second supporting part.

Preferably, the first maintenance frame comprises two vertically arranged first frames, the two first frames are arranged on the table top of the platform at intervals along a horizontal first direction, and the side walls of the two first frames are arranged at intervals to form the first inserting holes. The two first frames can be two independent pieces or can be connected into a whole.

Preferably, the second maintenance frame comprises two second frames which are vertically arranged, the two second frames are arranged on the platform surface of the platform at intervals along a horizontal first direction, and the second insertion opening into which the first end part of the centrifugal pump extends downwards is formed between the top walls of the two second frames. Similarly, the two first frames may be two independent members or may be integrally connected with each other.

Preferably, the side walls of the first frames extend in the vertical direction, and each side wall of each first frame is provided with a first connecting plate capable of moving up and down as the first supporting part, and part of the first connecting plate extends into the first socket and is provided with a first through hole which horizontally penetrates through the thickness of the first connecting plate and is opposite to the flange hole on the first flange, so that the first flange can be connected with the first nut through the first bolt via the corresponding flange hole and the first through hole to be restrained on the first supporting part;

each roof of second frame all extends along the horizontally, with first direction looks vertically second direction, and all is equipped with the second connecting plate that can remove along the second direction on the roof of each second frame and regards as foretell second supporting part, and the local level of this second connecting plate stretches into in the second socket to be equipped with and link up from top to bottom, and with the relative second through-hole in the flange hole on the first flange, thereby make first flange link to each other with the second nut and restrain on the second supporting part behind second bolt through the flange hole that corresponds, second through-hole.

In order to be able to adapt to centrifugal pumps of different sizes, further, at least one of the two first frames is movably constrained on the table top of the platform along a first direction;

the table top of the platform is provided with first strip-shaped holes extending along a first direction, and the first strip-shaped holes are at least two and are distributed at intervals along a horizontal second direction perpendicular to the first direction; the bottom wall of at least one of the two first frames is provided with a first limiting hole which is opposite to each first strip-shaped hole respectively, and the bottom wall is restrained on the table top of the platform through the connection of the first limiting hole and the first strip-shaped hole which correspond to each bolt and the first nut one;

at least one of the two second frames is movably restrained on the table top of the platform along a first direction;

the table top of the platform is provided with second strip-shaped holes extending along the first direction, and the second strip-shaped holes are at least two and are distributed at intervals along a horizontal second direction vertical to the first direction; and second limiting holes which are respectively opposite to the second strip-shaped holes are formed in the bottom wall of at least one of the two second frames, and the second limiting holes and the second strip-shaped holes are connected with the second nuts through the second bolts and the second nuts to be restrained on the table top of the platform.

In this way, the distance between the two first frames and the distance between the two second frames can be adjusted according to the size of the centrifugal pump.

In each of the above solutions, in order to further facilitate the maintenance of the centrifugal pump, preferably, the second end of the centrifugal pump is provided with a second flange, and the centrifugal pump further includes at least three limiting plates, the at least three limiting plates are circumferentially arranged on the platform surface of the platform at intervals, and a limiting opening for the second end of the centrifugal pump to be restrained in is defined between edges of the three limiting plates; the three limiting plates are arranged in a radial shape and can move along the radial direction under the action of external force, so that the size of the limiting opening is adjusted; meanwhile, each limiting plate is provided with a limiting bottom surface opposite to the platform surface of the platform at intervals, and a space for restraining the second flange is formed between each limiting bottom surface and the platform surface of the platform. Thereby the second flange can be abutted between each limit bottom surface and the platform surface.

In each of the above solutions, in order to facilitate the maintenance of the pump shaft on the workbench, preferably, the pump shaft maintenance platform further includes a fourth maintenance frame installed on the platform surface of the platform and having support wheels for supporting the pump shaft of the centrifugal pump, the two support wheels arranged along the horizontal first direction are taken as a set of support members, the support members have at least two sets and are arranged at intervals along the horizontal second direction perpendicular to the first direction, the rotation axis of each support wheel in each set of support members extends along the second direction, the circumferential walls of the two support wheels in each set of support members are opposite to each other, and form a V-shaped support surface for supporting the pump shaft of the centrifugal pump. Thus, the pump shaft can be rotatably supported on the V-shaped supporting surfaces of the two groups of supporting pieces.

Furthermore, the fourth maintenance frame is further provided with a limiting wheel, the limiting wheel can be rotatably arranged on one group of the supporting pieces, the limiting wheel and two supporting wheels in the group of the supporting pieces are arranged in a triangular mode, the rotating axis of the limiting wheel extends along the second direction, and the vertical distance between the limiting wheel and the corresponding group of the supporting pieces is adjustable. Therefore, when the limit wheel, the corresponding set of supporting pieces and the other set of supporting pieces restrain the pump shaft of the centrifugal pump, the bending detection can be carried out on the pump shaft.

In each of the above schemes, preferably, a circular depressed area with an inner diameter matched with an outer diameter of the first flange of the centrifugal pump is provided at the center of the table top of the platform, a first circular hole penetrating up and down is provided at the center of the circular depressed area, and an aperture of the first circular hole is matched with an outer diameter of a pump shell of the centrifugal pump.

Preferably, the edge of the table top of the platform is provided with a U-shaped hole which is communicated up and down and used for dismounting a coupling of the centrifugal pump, and the opening of the U-shaped hole is horizontally outward.

Furthermore, a second round hole for dismounting the coupling of the centrifugal pump is also arranged on the platform surface of the platform.

Thus, the coupling of the centrifugal pump can be disassembled by a knocking method or a pressing method.

And finally, third round holes for dismounting and mounting the rolling bearings of the centrifugal pump are formed in the platform surface of the platform, the third round holes are arranged at intervals, and the aperture of each third round hole is sequentially increased or decreased progressively along the arrangement direction. Thus, the rolling bearing of the centrifugal pump can be disassembled by a knocking method or a pressing method.

Compared with the prior art, the utility model has the advantages of: through the structure of overhauing the workstation design for having platform, first maintenance frame, second maintenance frame, the maintainer can be according to the waiting to overhaul position of centrifugal pump with centrifugal pump restraint on first maintenance frame, or vertical restraint is on the second maintenance frame, so, the maintainer of being convenient for carries out unified maintenance operation to the centrifugal pump on the workstation, and then can also improve maintenance quality when lightening maintainer working strength. And the application has simple structure and is convenient to implement.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

fig. 2 is a schematic structural diagram of another view angle according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of an embodiment of the present invention at another viewing angle;

fig. 4 is a usage state diagram of the embodiment of the present invention;

fig. 5 is a usage status diagram of another view angle according to the embodiment of the present invention;

fig. 6 is a usage status diagram of the embodiment of the present invention at another viewing angle;

fig. 7 is a usage status diagram of the top view of the embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

As shown in fig. 1 to 7, a preferred embodiment of the present invention is a work table for overhauling a centrifugal pump, wherein the centrifugal pump 6 has a first end 61 and a second end 62 opposite to each other along an extending direction of a pump shaft 60 of the centrifugal pump, a first flange 63 is provided on an outer peripheral wall of a pump casing of the centrifugal pump 6, and the first flange 63 is disposed adjacent to the first end 61 of the centrifugal pump 6; a second flange 64 is provided on the second end 62 of the centrifugal pump 6.

The workstation overhauls frame 3, limiting plate 4, fourth maintenance frame 5 including platform 1, first maintenance frame 2, second.

The platform 1 has an upwardly facing deck 10. The center of the table-board 10 of the platform 1 is provided with a circular depressed area 13 with an inner diameter matched with the outer diameter of the first flange 63 of the centrifugal pump 6, the center of the circular depressed area 13 is provided with a first circular hole 131 which is vertically penetrated, and the aperture of the first circular hole 131 is matched with the outer diameter of the pump shell of the centrifugal pump 6. The edge of the table top 10 of the platform 1 is provided with a U-shaped hole 14 which is communicated up and down and used for disassembling and assembling a coupler of the centrifugal pump 6, and the opening of the U-shaped hole 14 faces outwards horizontally. Meanwhile, a second round hole 15 for assembling and disassembling the coupling of the centrifugal pump 6 is also arranged on the table surface 10 of the platform 1. The table-board 10 of the platform 1 is provided with a plurality of third round holes 16 for dismounting the rolling bearings of the centrifugal pump 6, the third round holes 16 are arranged at intervals, and the aperture of each third round hole 16 is sequentially increased or decreased progressively along the arrangement direction. As shown in fig. 1, in the present embodiment, the U-shaped hole 14 is located at the front side of the circular recessed area 13, and the third circular hole 16 and the second circular hole 15 are located at the right side of the circular recessed area 13 in tandem.

Meanwhile, the platform 1 is supported on the ground and other base surfaces through four supporting feet.

The first service rack 2 is mounted on the leftmost table top 10 of the platform 1, the side wall of which has a first socket 20 into which the first end 61 of the centrifugal pump 6 projects horizontally, the edge of the first socket 20 being provided with a first support 21 for restraining a first flange 63 on the centrifugal pump 6 thereon. In this embodiment, the first maintenance frame 2 includes two vertically disposed first frames 22, the two first frames 22 are disposed on the table top 10 of the platform 1 at intervals along a horizontal first direction (in this embodiment, the first direction is a front-back direction of fig. 1), and the sidewalls of the two first frames are disposed at intervals and form the first socket 20. At the same time, one of the two first frames 22 is movably constrained to the table top 10 of the platform 1 in a first direction. Specifically, a first strip-shaped hole 11 extending along a first direction is formed in the table top 10 of the platform 1, and the first strip-shaped holes 11 are multiple and are distributed at intervals along a horizontal second direction (in this embodiment, the second direction is a left-right direction in fig. 1) perpendicular to the first direction; the bottom wall of one of the two first frames 22 is provided with a first limiting hole 221 which is opposite to each first strip-shaped hole 11, and the bottom wall is constrained on the table top 10 of the platform 1 by connecting a first bolt 26 with a first nut 27 through the corresponding first limiting hole 221 and the first strip-shaped hole 11. In order to better horizontally restrain the centrifugal pump, the side wall of each first frame 22 extends along the up-down direction, and the side wall of each first frame 22 is provided with a first connecting plate 23 capable of moving up and down as the first supporting part 21, a part of the first connecting plate 23 extends into the first socket 20 and is provided with a first through hole 230 horizontally penetrating the plate thickness and opposite to the flange hole on the first flange 63, so that the first flange 63 can be connected with the first nut 25 through the corresponding flange hole and the first through hole 230 by the first bolt 24 and restrained on the first supporting part 21.

Meanwhile, in order to realize that the first connection plate 23 can be constrained on the corresponding side wall of the first frame 22 in a vertically moving manner, the first connection plate 23 is provided with a strip hole 231 extending vertically, the side wall of the first frame 22 is provided with a plurality of mounting holes arranged at intervals vertically, and the first connection plate 23 can be constrained on the side wall of the first frame 22 by being connected with a nut through a bolt after passing through the corresponding strip hole 231 and the mounting holes.

The second service rack 3 is mounted on the table top 10 of the platform 1 and is located on the right side of the first service rack 2, on the left side of the circular depression 13, the top wall of which has a second socket 30 into which the first end 61 of the centrifugal pump 6 projects downwards, the edge of the second socket 30 being provided with a second support 31 for restraining a first flange 63 on the centrifugal pump 6 thereon. In this embodiment, the second service rack 3 includes two vertically disposed second frames 32, the two second frames 32 are disposed on the platform 10 of the platform 1 at intervals along the horizontal first direction, and the second insertion opening 30 into which the first end 61 of the centrifugal pump 6 extends downward is formed between top walls of the two frames. At the same time, one of the two second frames 32 is movably constrained to the table top 10 of the platform 1 along the first direction. Specifically, a plurality of second strip-shaped holes 12 extending along the first direction are formed in the table top 10 of the platform 1, and the second strip-shaped holes 12 are distributed at intervals along the second direction; a second limiting hole 321 opposite to each second strip-shaped hole 12 is formed in the bottom wall of one of the two second frames 32, and the bottom wall is constrained on the table top 10 of the platform 1 by connecting a second bolt 36 with a second nut 37 through the corresponding second limiting hole 321 and the second strip-shaped hole 12. In order to vertically restrain the centrifugal pump, the top wall of each second frame 32 extends along a horizontal second direction perpendicular to the first direction, and a second connecting plate 33 capable of moving along the second direction is provided on the top wall of each second frame 32 as the second support portion 31, a part of the second connecting plate 33 horizontally extends into the second socket 30, and a second through hole 330 is provided, which vertically penetrates through and is opposite to the flange hole on the first flange 63, so that the first flange 63 can be restrained on the second support portion 31 by connecting the second bolt 34 with the second nut 35 after passing through the corresponding flange hole and the second through hole 330.

For the second connecting plate 33 to be movably constrained on the top wall of the corresponding second frame 32 along the second direction, reference may be made to the connecting structure between the first connecting plate 23 and the side wall of the first frame 22 for the connecting structure between the top wall of the second connecting plate 33 and the top wall of the second frame 32, which is not described herein again.

The three limiting plates 4 are arranged on the table top 10 of the platform 1 at intervals along the circumferential direction and are positioned at the rear side of the second maintenance frame 3, and limiting openings 40 for limiting the second end 62 of the centrifugal pump 6 are defined between the edges of the three limiting plates 4; the three limiting plates 4 are arranged in a radial shape and can move along the radial direction under the action of external force, so that the size of the limiting opening 40 is adjusted; meanwhile, each of the position-limiting plates 4 has a position-limiting bottom surface 41 spaced from and facing the table surface 10 of the platform 1, and a space for restraining the second flange 64 is formed between each position-limiting bottom surface 41 and the table surface 10 of the platform 1. In this embodiment, in order to realize that the limiting plates 4 can move along the radiation direction under the action of external force, the limiting plates 4 are provided with strip-shaped holes 42 which extend along the length direction (i.e. the radiation direction) of the limiting plates 4 and are vertically communicated with each other, and the limiting plates 4 are connected with nuts through respective bolts through the corresponding strip-shaped holes 42 and are constrained on the table top 10 of the platform 1. Therefore, the limiting plates 4 are required to be moved outwards along the radial direction, then the second end 62 of the centrifugal pump 6 is restrained downwards among the three limiting plates 4, then the limiting plates 4 are moved inwards, and the bolts are tightened.

The fourth maintenance frame 5 is mounted on the table 10 of the platform 1 and located at the right side of the circular depressed area 13, and has two sets of support wheels 51 for supporting the pump shaft 60 of the centrifugal pump 6, and the two support wheels 51 arranged in the horizontal first direction are a set of support members 50, the support members 50 are arranged at intervals in the second direction, and the rotation axes of the support wheels 51 in each set of support members 50 extend in the second direction, and the peripheral walls of the two support wheels 51 in each set of support members 50 are opposite to each other and form a V-shaped support surface 511 for supporting the pump shaft 60 of the centrifugal pump 6. Meanwhile, the fourth maintenance frame 5 is further provided with a limiting wheel 52, the limiting wheel 52 can be rotatably arranged on one group of the supporting pieces 50, the two supporting wheels 51 of the group of the supporting pieces 50 are arranged in a triangular manner, the rotating axis of the limiting wheel 52 extends along the second direction, and the vertical distance between the limiting wheel 52 and the corresponding group of the supporting pieces 50 is adjustable.

In order to adjust the vertical distance between the limiting wheel 52 and the corresponding supporting member 50, the connection structure between the limiting wheel 52 and the fourth maintenance frame 5, and the connection structure between the supporting member 50 and the fourth maintenance frame 5 may refer to the connection structure between the first connection plate 23 and the sidewall of the first frame 22, which is not described herein again.

So, the maintainer can carry out unified maintenance operation according to waiting to overhaul the position of centrifugal pump with the centrifugal pump restraint on maintenance frame or the limiting plate that corresponds.

In this application, the installation positions of the first maintenance frame 2, the second maintenance frame 3, the limiting plate 4, and the fourth maintenance frame 5 on the table top 10 of the platform 1 are not limited to the arrangement positions in this embodiment, and can be designed as required.

Claims (12)

1. A workbench for overhauling a centrifugal pump is characterized in that the centrifugal pump (6) is provided with a first end part (61) and a second end part (62) which are opposite to each other along the extension direction of a pump shaft (60), the peripheral wall of a pump shell of the centrifugal pump (6) is provided with a first flange (63), and the first flange (63) is arranged adjacent to the first end part (61) of the centrifugal pump (6);

it is characterized in that the workbench comprises:

a platform (1) having an upwardly facing deck (10);

the first maintenance frame (2) is arranged on the table top (10) of the platform (1), the side wall of the first maintenance frame is provided with a first socket (20) for horizontally extending a first end part (61) of the centrifugal pump (6), and the edge of the first socket (20) is provided with a first supporting part (21) for restraining a first flange (63) on the centrifugal pump (6);

and the second maintenance frame (3) is arranged on the table top (10) of the platform (1), the top wall of the second maintenance frame is provided with a second socket (30) for the first end part (61) of the centrifugal pump (6) to downwards extend into, and the edge of the second socket (30) is provided with a second supporting part (31) for restraining the first flange (63) on the centrifugal pump (6) on the second supporting part.

2. The table of claim 1, wherein: first maintenance frame (2) are including two vertical first frames (22) that set up, and two first frames (22) set up on mesa (10) of platform (1) along horizontal first direction interval, and interval sets up and forms foretell first socket (20) between the lateral wall between the two.

3. The table of claim 2, wherein: the second maintenance frame (3) comprises two vertically arranged second frames (32), the two second frames (32) are arranged on the table top (10) of the platform (1) at intervals along a horizontal first direction, and a second inserting opening (30) for downwards extending a first end portion (61) of the centrifugal pump (6) into is formed between the top walls of the two second frames.

4. The table of claim 3, wherein: the side wall of each first frame (22) extends along the vertical direction, a first connecting plate (23) capable of moving up and down is arranged on the side wall of each first frame (22) to serve as the first supporting part (21), and the local part of the first connecting plate (23) extends into the first inserting opening (20) and is provided with a first through hole (230) which horizontally penetrates through the plate thickness of the first connecting plate and is opposite to the flange hole on the first flange (63);

the top wall of each second frame (32) extends along a horizontal second direction perpendicular to the first direction, a second connecting plate (33) capable of moving along the second direction is arranged on the top wall of each second frame (32) and serves as the second supporting portion (31), a part of the second connecting plate (33) horizontally extends into the second inserting opening (30), and a second through hole (330) which is vertically communicated and is opposite to the flange hole in the first flange (63) is arranged.

5. The table of claim 3, wherein: at least one of the two first frames (22) is constrained to the table top (10) of the platform (1) so as to be movable along a first direction;

the table top (10) of the platform (1) is provided with first strip-shaped holes (11) extending along a first direction, and the first strip-shaped holes (11) are at least two and are distributed at intervals along a second horizontal direction perpendicular to the first direction; a first limiting hole (221) which is opposite to each first strip-shaped hole (11) is formed in the bottom wall of at least one of the two first frames (22), and the bottom wall is connected with a first nut (27) through a first bolt (26) and a corresponding first limiting hole (221) and the first strip-shaped hole (11) to be restrained on the table top (10) of the platform (1);

at least one of the two second frames (32) is constrained to the table top (10) of the platform (1) so as to be movable along a first direction;

a table top (10) of the platform (1) is provided with second strip-shaped holes (12) extending along a first direction, and the second strip-shaped holes (12) are at least two and are distributed at intervals along a second horizontal direction perpendicular to the first direction; and second limiting holes (321) which are respectively opposite to the second strip-shaped holes (12) are formed in the bottom wall of at least one of the two second frames (32), and the bottom wall of at least one of the two second frames (32) is connected with a second nut (37) through a second bolt (36) passing through the corresponding second limiting hole (321) and the second strip-shaped hole (12) to be constrained on the table top (10) of the platform (1).

6. The table of claim 1, wherein: a second flange (64) is arranged on the second end part (62) of the centrifugal pump (6), the centrifugal pump further comprises at least three limiting plates (4), the limiting plates (4) are arranged on the platform surface (10) of the platform (1) at intervals along the circumferential direction, and limiting ports (40) for limiting the second end part (62) of the centrifugal pump (6) are defined by the edges of the three limiting plates (4); the three limiting plates (4) are arranged in a radial shape and can move along the radial direction under the action of external force, so that the size of the limiting opening (40) is adjusted; meanwhile, each limit plate (4) is provided with a limit bottom surface (41) opposite to the table top (10) of the platform (1) at intervals, and a space for restraining the second flange (64) is formed between each limit bottom surface (41) and the table top (10) of the platform (1).

7. A workbench according to any of claims 1 to 6, wherein: the maintenance platform is characterized by further comprising a fourth maintenance frame (5) which is arranged on the platform surface (10) of the platform (1) and is provided with supporting wheels (51) used for supporting a pump shaft (60) of the centrifugal pump (6), the two supporting wheels (51) arranged along the horizontal first direction are taken as a group of supporting pieces (50), at least two groups of supporting pieces (50) are arranged at intervals along the horizontal second direction which is perpendicular to the first direction, the rotating axes of the supporting wheels (51) in each group of supporting pieces (50) extend along the second direction, the peripheral walls of the two supporting wheels (51) in each group of supporting pieces (50) are opposite, and a V-shaped supporting surface (511) used for supporting the pump shaft (60) of the centrifugal pump (6) is formed.

8. The table of claim 7, wherein: the fourth maintenance frame (5) is further provided with a limiting wheel (52), the limiting wheel (52) can be rotatably arranged on one group of supporting pieces (50) and is arranged in a triangular mode with two supporting wheels (51) in the group of supporting pieces (50), the rotating axis of the limiting wheel (52) extends along the second direction, and the vertical distance between the limiting wheel (52) and the corresponding group of supporting pieces (50) is adjustable.

9. A workbench according to any of claims 1 to 6, wherein: a circular depressed area (13) with the inner diameter matched with the outer diameter of a first flange (63) of the centrifugal pump (6) is arranged in the center of a platform surface (10) of the platform (1), a first round hole (131) which is communicated up and down is formed in the center of the circular depressed area (13), and the diameter of the first round hole (131) is matched with the outer diameter of a pump shell of the centrifugal pump (6).

10. A workbench according to any of claims 1 to 6, wherein: the edge of the table top (10) of the platform (1) is provided with a U-shaped hole (14) which is communicated up and down and used for dismounting a coupler of the centrifugal pump (6), and the opening of the U-shaped hole (14) is horizontally outward.

11. The table of claim 10, wherein: and a second round hole (15) for dismounting and mounting the coupling of the centrifugal pump (6) is also formed in the table top (10) of the platform (1).

12. A workbench according to any of claims 1 to 6, wherein: the platform surface (10) of the platform (1) is provided with a plurality of third round holes (16) for dismounting and mounting the rolling bearings of the centrifugal pump (6), the third round holes (16) are arranged at intervals, and the aperture of each third round hole (16) is sequentially increased or decreased progressively along the arrangement direction.

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