Auxiliary fixture for disassembling and assembling impeller of multistage centrifugal pump

Abstract

The invention discloses an auxiliary fixture for disassembling and assembling an impeller of a multistage centrifugal pump. The auxiliary fixture comprises a gate-type bracket, an impeller shaft clamping mechanism, an impeller clamping mechanism and a traction mechanism, the impeller shaft clamping mechanism is used for clamping and fixing the lower end of an impeller shaft of the multi-stage centrifugal pump, so that the impeller of the multi-stage centrifugal pump is kept in a vertical state; the number of the impeller clamping mechanisms is at least two, the impeller clamping mechanisms are evenly distributed in the circumferential direction of the impeller shaft clamping mechanism in a surrounding mode, each impeller clamping mechanism comprises a plurality of impeller clamping assemblies and a plurality of connecting assemblies, and the impeller clamping assemblies are arranged in the longitudinal direction; the traction mechanism comprises a linear moving assembly and a mounting seat; the impeller shaft clamping mechanism is used for clamping and fixing the lower end of the impeller shaft of the multi-stage centrifugal pump, a disassembling and transferring space is reserved above the impeller shaft, the impeller clamping mechanism and the traction mechanism are matched, the multi-stage impeller is separated, the clamping position does not need to be adjusted back and forth, and therefore the tedious process of the whole disassembling operation is reduced, and the disassembling efficiency is improved. And the timeliness of the dismantling operation is improved.

Description

Technical Field

[0001] The invention relates to the technical field of centrifugal pump impeller disassembly, in particular to a multi-stage centrifugal pump impeller disassembly and assembly auxiliary clamp. Background Art

[0002] The main function of a multistage centrifugal pump is to achieve high-lift fluid transportation by absorbing and pressing water in multiple stages. A multistage centrifugal pump is mainly composed of a pump body, an impeller shaft and multiple impellers. Each impeller is stacked in the pump to convert the kinetic energy of the fluid into static pressure energy, thereby increasing the pressure of the fluid so that it can be transported to a higher position or in situations where high pressure is required.

[0003] During long-term use, multi-stage centrifugal pumps need to be maintained and serviced in order to extend their service life and keep them in good working condition. Therefore, the impellers of the multi-stage centrifugal pumps need to be disassembled, cleaned and inspected. Since the multi-stage centrifugal pumps have many impeller stages, the impellers and the impeller shafts usually have excessive or interference fits, and during long-term use, there is too much resistance at the connection, which makes it difficult to disassemble directly by hand, but requires special disassembly tools.

[0004] When disassembling and assembling the impeller of a multi-stage centrifugal pump, the current assembly tools usually use a clamping structure to hold the outermost impeller tightly and use pulling to separate the impeller from the impeller shaft. Since there are a large number of impellers in a multi-stage centrifugal pump, the above-mentioned disassembly process adopts a method of disassembling each impeller in turn. During the disassembly process, the position of the clamping structure needs to be constantly adjusted, and the installation position of the clamping structure is unreasonable. The disassembled impeller is difficult to be directly removed from the clamping structure, which makes the entire disassembly and assembly process too cumbersome. For example, the patent with publication number CN214661092U discloses a special tool for disassembling the impeller of a multi-stage centrifugal pump, which discloses that a top plate is arranged above the impeller shaft, and pull rods are detachably connected on both sides of the top plate. The ends of the pull rods are provided with a buckle sleeve locking structure detachably connected to the impeller, and a jack is arranged between the impeller shaft and the top plate. The reaction force generated by the extension and contraction of the jack changes the longitudinal spacing between the top plate and the impeller shaft, and the impeller is pulled and separated from top to bottom in sequence by using the pull rod and the buckle sleeve locking structure. However, each time an impeller is disassembled, the position of the pull rod needs to be adjusted so that the buckle sleeve locking structure is connected to the next impeller correspondingly, which involves a cumbersome disassembly and installation positioning process, and the presence of the jack will hinder the separated impeller, making it difficult to directly remove the separated impeller from the impeller shaft. The jack needs to be taken out first, and the disassembled impeller needs to be transferred before the disassembly process of the next stage impeller can be realized, which greatly increases the operation time of the disassembly process. Summary of the invention

[0005] The purpose of the present invention is to provide a multi-stage centrifugal pump impeller disassembly and assembly auxiliary clamp to solve the problem in the prior art that when using the disassembly and assembly auxiliary clamp to disassemble and assemble the multi-stage centrifugal pump impeller, the disassembly and assembly clamping position needs to be frequently adjusted and the clamp itself hinders the transfer process of the impeller after disassembly, making the disassembly process cumbersome and affecting the timeliness of the disassembly operation.

[0006] The technical solution of the present invention is:

[0007] A multi-stage centrifugal pump impeller disassembly and assembly auxiliary clamp, comprising a gate-type bracket, an impeller shaft clamping mechanism, an impeller clamping mechanism and a pulling mechanism; the impeller shaft clamping mechanism is arranged on the inner side of the gate-type bracket, and is used to clamp and fix the lower end of the impeller shaft of the multi-stage centrifugal pump, so that the impeller of the multi-stage centrifugal pump remains in an upright state; there are at least two groups of impeller clamping mechanisms, and they are evenly distributed around the circumference of the impeller shaft clamping mechanism, each group of impeller clamping mechanisms includes multiple groups of impeller clamping assemblies and multiple connecting assemblies, the multiple groups of impeller clamping assemblies are arranged in the longitudinal direction, and each impeller clamping assembly includes two parallel clamping claws and a driving structure, and the driving structure It is used to drive the two clamping jaws to open and close to clamp the upper and lower inner plate surfaces of the impeller casing of a single-stage centrifugal pump. The driving structures of two adjacent impeller clamping assemblies are connected together through the connecting assembly to achieve simultaneous clamping of the impeller casing of a multi-stage centrifugal pump. The pulling mechanism includes a linear moving assembly and a mounting seat. The linear moving assembly is arranged on the crossbeam of the gantry bracket, the moving end of the linear moving assembly is connected to the mounting seat, and the impeller clamping mechanism is connected to the bottom of the mounting seat. Under the drive of the linear moving assembly, the mounting seat and the impeller clamping mechanism are driven to move vertically upward to separate the impeller of the multi-stage centrifugal pump from the impeller shaft.

[0008] Preferably, as a further improvement of the present invention, the connecting assembly includes a connecting block and a connecting rod; the side wall of the connecting block is connected to the shell part of the driving structure in the impeller clamping assembly through a fixing rod; one end of the connecting rod is fixed to the top of the connecting block, and the other end of the connecting rod is fixed to the bottom of the connecting block in the adjacent connecting assembly on the upper side, and the other end of the connecting rod in the uppermost connecting assembly is connected to the bottom of the mounting seat.

[0009] Preferably, as a further improvement of the present invention, a cavity is provided inside the connecting block, the cavity is in an inverted T-shape and passes through the top of the connecting block, strip grooves are provided on both sides of the connecting block, and the strip grooves are connected to the cavity, the connecting rod is a T-shaped connecting rod, having a horizontal section and a vertical section, the horizontal end of the T-shaped connecting rod is slidably connected in the cavity, and sliders are fixed on both sides of the horizontal end of the T-shaped connecting rod, the two sliders are respectively slidably connected in the two strip grooves, a spring is connected between the horizontal end of the T-shaped connecting rod and the inner top surface of the cavity, and the vertical end of the T-shaped connecting rod passes through the cavity and extends to the outside of the connecting block and is fixed to the bottom of the connecting block in the adjacent connecting assembly on the upper side.

[0010] Preferably, as a further improvement of the present invention, a horizontal spacing adjustment mechanism is provided between each group of impeller clamping mechanisms and the longitudinal beam of the gantry bracket, and the horizontal spacing adjustment mechanism comprises a telescopic rod, a vertical sliding assembly and a horizontal sliding assembly; the telescopic rod is horizontally arranged, one end of the telescopic rod is fixed to the vertical end side wall of the T-shaped connecting rod in the connecting assembly located at the uppermost side; the vertical sliding assembly comprises a limit groove and a limit block, the limit groove is arranged on the longitudinal beam of the gantry bracket and is arranged longitudinally thereof, the limit block is slidably connected in the limit groove, and the other end of the telescopic rod is fixed to the side wall of the limit block; the horizontal sliding assembly comprises a slide groove and a slide seat, the slide groove is arranged at the bottom of the mounting seat and is arranged along the length direction of the slide groove, the cross-section of the slide groove is T-shaped, the slide seat is slidably connected to the inside of the large-diameter groove cavity of the slide groove, and the vertical end of the T-shaped connecting rod in the connecting assembly located at the uppermost side extends into the slide groove and is fixed to the bottom of the slide seat.

[0011] Preferably, as a further improvement of the present invention, the cross-section of the limiting groove is dovetail-shaped, and the shape of the limiting block matches the shape of the limiting groove.

[0012] Preferably, as a further improvement of the present invention, the linear motion assembly includes two multi-stage hydraulic telescopic cylinders, the cylinder body of each multi-stage hydraulic telescopic cylinder is fixed to the bottom of the crossbeam of the gantry bracket, and the piston rod end of each multi-stage hydraulic telescopic cylinder is fixed to the top of the mounting seat.

[0013] Preferably, as a further improvement of the present invention, an impeller shaft abutment mechanism is provided directly above the impeller shaft clamping mechanism, and the impeller shaft abutment mechanism includes a push rod and a lifting assembly; the push rod is vertically arranged, and the diameter of the push rod is smaller than the diameter of the multi-stage centrifugal pump shaft body, and a through hole for the push rod to pass through is provided in the middle of the cross beam of the gantry bracket and the mounting seat; the lifting assembly is arranged on the cross beam of the gantry bracket, and the moving end of the lifting assembly is connected to the push rod, which is used to drive the push rod to move vertically downward to abut the upper end of the impeller shaft of the multi-stage centrifugal pump during disassembly.

[0014] Preferably, as a further improvement of the present invention, vertically arranged guide sleeves are fixed inside the through holes of the gantry bracket and the mounting seat respectively, and the support rod is slidably inserted into the guide sleeves.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The impeller shaft clamping mechanism is used to clamp and fix the lower end of the impeller shaft of the multi-stage centrifugal pump, so that the impeller of the multi-stage centrifugal pump remains in an upright state, and a disassembly and transfer space is reserved above the impeller shaft to prevent affecting the picking and placing process. The impeller clamping mechanism set up can form a clamping and fixing function for the impeller of each stage of the centrifugal pump. Driven by the pulling mechanism, the process of pulling and separating the impellers of the multi-stage centrifugal pump from the impeller shaft is realized. There is no need to adjust the clamping position back and forth. The separated impeller can be directly removed from the disassembly and transfer space reserved above the impeller shaft, thereby reducing the cumbersome process of the entire dismantling operation and improving the timeliness of the dismantling operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the main structure of a multi-stage centrifugal pump impeller disassembly and assembly auxiliary clamp of the present invention.

[0018] Figure 2 The present invention is a schematic diagram of the main cross-sectional structure of a multi-stage centrifugal pump impeller disassembly and assembly auxiliary clamp.

[0019] Figure 3 For the present invention Figure 2 A local enlarged schematic diagram of point A in the figure.

[0020] Figure 4 For the present invention Figure 2 A local enlarged schematic diagram of point B in the figure. DETAILED DESCRIPTION

[0021] The following is combined with Figure 1 To the attached Figure 4 , the specific implementation methods of the present invention are described in detail. In the description of the invention, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0022] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the invention, unless otherwise specified, "plurality" means two or more.

[0023] Example

[0024] like Figures 1 to 4As shown, an embodiment of the present invention provides a multi-stage centrifugal pump impeller disassembly and assembly auxiliary clamp, including a portal bracket 1, which serves as an installation support carrier of the clamp; the multi-stage centrifugal pump impeller serves as the core structure of the centrifugal pump. During disassembly and assembly, the multi-stage centrifugal pump impeller and its impeller shaft need to be removed from the pump body, and then the multi-stage centrifugal pump impeller needs to be removed from the impeller shaft.

[0025] In order to keep the impeller of the multi-stage centrifugal pump in an upright state during disassembly and assembly and to facilitate the removal of the impeller, an impeller shaft clamping mechanism 2 is provided. Specifically, the impeller shaft clamping mechanism 2 can adopt a three-jaw chuck or a bench vise. The impeller shaft clamping mechanism 2 is used to clamp and fix the lower end of the impeller shaft, thereby facilitating the removal of the impeller from above.

[0026] In the present embodiment, considering that the impellers of a multi-stage centrifugal pump are to be disassembled and there are a large number of impellers, it is troublesome to disassemble them one by one, so at least two groups of impeller clamping mechanisms and pulling mechanisms are provided, which can realize the removal of multiple centrifugal pump impellers on the impeller shaft at one time. Among them, taking two groups of impeller clamping mechanisms as an example, when in use, they are symmetrically arranged on both sides of the impeller shaft clamping mechanism 2, each group of impeller clamping mechanisms includes multiple groups of impeller clamping assemblies 3 and multiple connecting assemblies 4, and the multiple groups of impeller clamping assemblies 3 are arranged in the longitudinal direction. Each impeller clamping assembly 3 includes two parallelly arranged clamping jaws and a driving structure. The driving structure is used to drive the two clamping jaws to open and close to realize the clamping of the upper and lower inner plate surfaces of the impeller casing of a single-stage centrifugal pump. Specifically, during implementation, A two-finger parallel pneumatic finger or a hydraulic opener is used, which has an outer shell and relies on hydraulic or air pressure as a power source to drive the two parallel clamps to open and close to realize the clamping process. The driving structures of the two adjacent impeller clamping assemblies 3 are connected together by a connecting assembly 4 to realize the simultaneous clamping process of the impeller casing of the multi-stage centrifugal pump; the pulling mechanism includes a linear moving assembly 51 and a mounting seat 52, the linear moving assembly 51 is arranged on the crossbeam of the gantry bracket 1, the moving end of the linear moving assembly 51 is connected to the mounting seat 52, and the two sets of impeller clamping mechanisms are connected to the bottom of the mounting seat 52. Under the drive of the linear moving assembly 51, the mounting seat 52 and the two sets of impeller clamping mechanisms are driven to move vertically upward to separate the impeller of the multi-stage centrifugal pump from the impeller shaft.

[0027] Specifically, Figure 1 As shown, the connecting assembly 4 includes a connecting block 41 and a connecting rod 42; the side wall of the connecting block 41 is connected to the shell part of the driving structure in the impeller clamping assembly 3 through a fixing rod; one end of the connecting rod 42 is fixed to the top of the connecting block 41, and the other end of the connecting rod 42 is fixed to the bottom of the connecting block 41 in the upper adjacent connecting assembly 4, and the other end of the connecting rod 42 in the uppermost connecting assembly 4 is connected to the bottom of the mounting seat 52.

[0028] Furthermore, considering that when the centrifugal pump impellers are pulled and separated synchronously by the connection component 4, the resistance is too large and the separation process may not be achieved. Therefore, in this embodiment, the structure of the connection component 4 is optimized so that it can separate the centrifugal pump impellers in sequence from top to bottom in steps, such as Figure 2 and Figure 3 As shown, a cavity 411 is provided inside the connecting block 41, and the cavity 411 is in an inverted T-shape and passes through the top of the connecting block 41. Strip slots 412 are provided on both sides of the connecting block 41, and the strip slots 412 are connected to the cavity 411. The connecting rod 42 is a T-shaped connecting rod, which has a horizontal section and a vertical section. The horizontal end of the T-shaped connecting rod is slidably connected in the cavity 411, and sliders 43 are fixed on both sides of the horizontal end of the T-shaped connecting rod. The two sliders 43 are respectively slidably connected in the two strip slots 412. A spring 44 is connected between the horizontal end of the T-shaped connecting rod and the inner top surface of the cavity 411. The vertical end of the T-shaped connecting rod passes through the cavity 411 and extends to the outside of the connecting block 41 and is fixed to the bottom of the connecting block 41 in the upper adjacent connecting assembly 4.

[0029] In this embodiment, refer to Figure 3 , the spring 44 arranged in the cavity 411 is always in a compressed state, so that before the traction separation, the horizontal end of the connecting rod 42 is kept in contact with the bottom surface of the cavity 411, and the slider 43 is located at the bottom of the strip groove 412, which is also convenient for positioning the connecting block 41, ensuring that the spacing of each connecting block 41 is equal to the spacing of each impeller, so that each clamping claw is convenient to extend for clamping. When the pulling separation is performed after clamping, the connecting rod 42 located in the uppermost connecting component 4 is firstly driven by the traction force given by the linear moving component 51 to drive the slider 43 to move vertically along the strip groove 412, and the spring 44 is continuously compressed during the movement until The slider 43 moves along the strip slot 412 until it contacts the top of the strip slot 412, and then starts to move upward as a whole, thereby driving the impeller clamping assembly 3 connected thereto to move upward to pull and separate the top centrifugal pump impeller. As the top connecting assembly 4 moves and separates, the second-stage separation process begins. The same as the above principle, due to the presence of the spring 44 and the strip slot 412, the separation process is not carried out simultaneously, but there is a certain time difference. After the previous separation, it takes a period of time for the spring 44 to stretch and deform and the slider 43 to move before the next separation comes, thereby avoiding simultaneous force.

[0030] Furthermore, in order to facilitate the removal of the impeller, a horizontal spacing adjustment mechanism is provided between each set of impeller clamping mechanisms and the longitudinal beam of the gantry bracket 1, and the horizontal spacing adjustment mechanism includes a telescopic rod 61, a vertical sliding assembly and a horizontal sliding assembly; the telescopic rod 61 is arranged horizontally, and one end of the telescopic rod 61 is fixed to the vertical end side wall of the T-shaped connecting rod in the uppermost connecting assembly 4; the vertical sliding assembly includes a limiting groove 11 and a limiting block 62, and the limiting groove 11 is provided on the longitudinal beam of the gantry bracket 1 and is longitudinally opened It is assumed that the limit block 62 is slidably connected in the limit groove 11, and the other end of the telescopic rod 61 is fixed to the side wall of the limit block 62; the horizontal sliding component includes a slide groove 521 and a slide seat 63, the slide groove 521 is opened at the bottom of the mounting seat 52 and is arranged along the length direction of the slide groove 521, the cross-section of the slide groove 521 is T-shaped, and the slide seat 63 is slidably connected inside the large-diameter groove cavity of the slide groove 521, and the vertical end of the T-shaped connecting rod in the uppermost connecting component 4 extends into the slide groove 521 and is fixed to the bottom of the slide seat 63.

[0031] Among them, in order to avoid the lack of support and positioning of the telescopic rod 61 when it is horizontally extended and retracted, the cross-section of the limit groove 11 is made into a dovetail shape, and the shape of the limit block 62 matches the shape of the limit groove 11. Through the cooperation of the dovetail limit groove 11 and the dovetail limit block 62, the horizontal limitation of the limit block 62 can be achieved to prevent the limit block 62 from detaching from the limit groove 11, and the cylinder body of the telescopic rod 61 is supported when the telescopic rod 61 is retracted.

[0032] Specifically, Figure 1 and Figure 2 As shown, the linear motion assembly 51 includes two multi-stage hydraulic telescopic cylinders, the cylinder body of each multi-stage hydraulic telescopic cylinder is fixed to the bottom of the crossbeam of the gantry support 1, and the piston rod end of each multi-stage hydraulic telescopic cylinder is fixed to the top of the mounting seat 52.

[0033] In another embodiment of the present invention, considering that the lower end of the impeller shaft is clamped and fixed by the impeller shaft clamping mechanism 2 alone, when multiple centrifugal pump impellers are disassembled and separated by the impeller clamping mechanism and the pulling mechanism, the resistance is large and it is difficult to stably maintain the clamping limit of the impeller shaft, and there is a problem of pulling out the impeller shaft. Therefore, an impeller shaft abutment mechanism is provided just above the impeller shaft clamping mechanism 2, such as Figure 1 , Figure 2 and Figure 4As shown, the impeller shaft abutment mechanism includes a push rod 7 and a lifting assembly 8; the push rod 7 is vertically arranged, and the diameter of the push rod 7 is smaller than the diameter of the multi-stage centrifugal pump shaft body. The cross beam of the gantry bracket 1 and the middle part of the mounting seat 52 are provided with a through hole for the push rod 7 to pass through; the lifting assembly 8 is arranged on the cross beam of the gantry bracket 1, and the moving end of the lifting assembly 8 is connected to the push rod 7, which is used to drive the push rod 7 to move vertically downward to abut the upper end of the impeller shaft of the multi-stage centrifugal pump during disassembly, forming a limit on the longitudinal displacement of the impeller shaft, and assisting the impeller shaft clamping mechanism 2 in the clamping and limiting function of the impeller shaft to avoid the problem of the impeller shaft being pulled and moved. At the same time, by making the diameter of the push rod 7 smaller than the diameter of the multi-stage centrifugal pump shaft body, the multi-stage centrifugal pump impeller that is pulled and separated can continue to move to avoid obstruction. When the separation is completed, the push rod 7 is lifted by the lifting assembly 8 to facilitate removal from the impeller clamping mechanism.

[0034] Specifically, the lifting assembly 8 includes a motor 81, a reducer 82, a gear 83 and a rack 84. The motor 81 is fixed on the top of the crossbeam of the gantry bracket 1. The output shaft of the motor 81 is connected to the input shaft of the reducer 82. The output shaft of the reducer 82 is fixedly connected to the gear 83. The side wall of the push rod 7 is provided with a mounting groove 71 along its longitudinal direction. A rack 84 is fixed in the mounting groove 71. One side of the gear 83 extends into the mounting groove 71 and meshes with the rack 84. The motor 81 is controlled to drive the reducer 82 to rotate. The reducer 82 transmits power to the gear 83 to drive the gear 83 to rotate. The rotation of the gear 83 drives the rack 84 to realize vertical movement, thereby driving the push rod 7 to perform vertical lifting and lowering movement, and the push rod 7 is used to abut the upper end of the impeller shaft.

[0035] Furthermore, in order to achieve vertical guidance during the movement of the push rod 7 and prevent it from being offset, vertically arranged guide sleeves 9 are respectively fixed inside the through holes opened in the gantry bracket 1 and the mounting seat 52, and the push rod 7 is slidably inserted into the guide sleeves 9.

[0036] The above disclosures are only several preferred specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A multi-stage centrifugal pump impeller disassembly and assembly auxiliary fixture, comprising a door-type bracket (1), characterized in that: Also includes: An impeller shaft clamping mechanism (2) is arranged on the inner side of the door-type bracket (1) and is used to clamp and fix the lower end of the impeller shaft of the multi-stage centrifugal pump so that the impeller of the multi-stage centrifugal pump remains in an upright state; At least two groups of impeller clamping mechanisms are evenly distributed around the circumference of the impeller shaft clamping mechanism (2), each group of impeller clamping mechanisms comprises a plurality of groups of impeller clamping assemblies (3) and a plurality of connecting assemblies (4), the plurality of groups of impeller clamping assemblies (3) are arranged in the longitudinal direction, each impeller clamping assembly (3) comprises two parallel clamping jaws and a driving structure, the driving structure is used to drive the two clamping jaws to open and close to clamp the upper and lower inner plate surfaces of the impeller casing of a single-stage centrifugal pump, the driving structures of two adjacent impeller clamping assemblies (3) are connected together via the connecting assembly (4) to simultaneously clamp the impeller casings of the multi-stage centrifugal pump; The pulling mechanism comprises a linear moving component (51) and a mounting seat (52), wherein the linear moving component (51) is arranged on a crossbeam of a gantry support (1), the moving end of the linear moving component (51) is connected to the mounting seat (52), and the impeller clamping mechanism is connected to the bottom of the mounting seat (52). The linear moving component (51) drives the mounting seat (52) and the impeller clamping mechanism to move vertically upward to separate the impeller of the multi-stage centrifugal pump from the impeller shaft.

2. The multi-stage centrifugal pump impeller disassembly and assembly auxiliary fixture according to claim 1, characterized in that: The connection component (4) comprises: A connecting block (41), the side wall of which is connected to a housing portion of a driving structure in the impeller clamping assembly (3) via a fixing rod; A connecting rod (42) has one end fixed to the top of the connecting block (41) and the other end fixed to the bottom of the connecting block (41) in the upper adjacent connecting assembly (4); the other end of the connecting rod (42) in the uppermost connecting assembly (4) is connected to the bottom of the mounting seat (52).

3. The multi-stage centrifugal pump impeller disassembly and assembly auxiliary fixture according to claim 2, characterized in that: A cavity (411) is provided inside the connection block (41). The cavity (411) is in an inverted T-shape and passes through the top of the connection block (41). Strip notches (412) are provided on both sides of the connection block (41), and the strip notches (412) are communicated with the cavity (411). The connecting rod (42) is a T-shaped connecting rod having a horizontal section and a vertical section. The horizontal end of the T-shaped connecting rod is slidably connected in the cavity (411), and sliders (43) are fixed on both sides of the horizontal end of the T-shaped connecting rod. The two sliders (43) are respectively slidably connected in the two strip notches (412). A spring (44) is connected between the horizontal end of the T-shaped connecting rod and the inner top surface of the cavity (411). The vertical end of the T-shaped connecting rod passes through the cavity (411) and extends to the outside of the connection block (41) to be fixed to the bottom of the connection block (41) located in the upper adjacent connection assembly (4).

4. The multi-stage centrifugal pump impeller disassembly and assembly auxiliary fixture according to claim 3, characterized in that: A horizontal spacing adjustment mechanism is provided between each set of impeller clamping mechanisms and the longitudinal beam of the portal support (1), and the horizontal spacing adjustment mechanism comprises: A telescopic rod (61) is arranged horizontally, and one end of the telescopic rod (61) is fixed to a vertical end side wall of a T-shaped connecting rod in the uppermost connecting assembly (4); A vertical sliding assembly comprises a limiting groove (11) and a limiting block (62), wherein the limiting groove (11) is provided on the longitudinal beam of the portal bracket (1) and is provided along the longitudinal direction thereof, the limiting block (62) is slidably connected in the limiting groove (11), and the other end of the telescopic rod (61) is fixed to the side wall of the limiting block (62); The horizontal sliding assembly comprises a slide groove (521) and a slide seat (63). The slide groove (521) is opened at the bottom of the mounting seat (52) and is arranged along the length direction of the slide groove (521). The cross section of the slide groove (521) is T-shaped. The slide seat (63) is slidably connected inside the large-diameter groove cavity of the slide groove (521). The vertical end of the T-shaped connecting rod in the uppermost connecting assembly (4) extends into the slide groove (521) and is fixed to the bottom of the slide seat (63).

5. The multi-stage centrifugal pump impeller disassembly and assembly auxiliary fixture according to claim 4, characterized in that: The cross section of the limiting groove (11) is dovetail-shaped, and the shape of the limiting block (62) matches the shape of the limiting groove (11).

6. The multi-stage centrifugal pump impeller disassembly and assembly auxiliary fixture according to claim 4, characterized in that: The linear motion assembly (51) comprises two multi-stage hydraulic telescopic cylinders, the cylinder body of each multi-stage hydraulic telescopic cylinder is fixed to the bottom of the crossbeam of the gantry support (1), and the piston rod end of each multi-stage hydraulic telescopic cylinder is fixed to the top of the mounting seat (52).

7. The multi-stage centrifugal pump impeller disassembly and assembly auxiliary fixture according to any one of claims 2 to 6, characterized in that: An impeller shaft abutment mechanism is provided directly above the impeller shaft clamping mechanism (2), and the impeller shaft abutment mechanism comprises a butt rod (7) and a lifting assembly (8). The butt rod (7) is vertically arranged, and the diameter of the butt rod (7) is smaller than the diameter of the multi-stage centrifugal pump shaft body. A through hole for the butt rod (7) to pass through is provided in the middle of the cross beam of the gantry bracket (1) and the mounting seat (52). The lifting assembly (8) is arranged on the cross beam of the gantry bracket (1), and the movable end of the lifting assembly (8) is connected to the butt rod (7) to drive the butt rod (7) to move vertically downward to abut against the upper end of the impeller shaft of the multi-stage centrifugal pump during disassembly.

8. The multi-stage centrifugal pump impeller disassembly and assembly auxiliary fixture according to claim 7, characterized in that: A vertically arranged guide sleeve (9) is fixed inside the through holes provided in the door-type bracket (1) and the mounting seat (52), and the support rod (7) is slidably inserted into the guide sleeve (9).

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