Multistage pump dismounting and mounting tool

Abstract

This utility model discloses a multi-stage pump assembly and disassembly fixture, including a maintenance support and a hoisting device. The maintenance support includes a base plate, columns, a tray, and positioning pins. The base plate is placed horizontally on a maintenance platform. Multiple columns are vertically mounted on the base plate and correspond to different tension bolt holes on the pump body of the multi-stage pump. The lower end of each column is fixedly connected to the base plate, and the upper end passes through the tension bolt holes on the pump body and has a positioning hole that matches the positioning pin. The positioning pin is inserted into the positioning hole. The upper middle part of the column has a ladder corresponding to the pump body of the multi-stage pump. The tray is fixed in the middle of the base plate, and the lower end of the pump shaft of the multi-stage pump rests on the tray. This utility model adopts a vertical assembly and disassembly method and uses a hoisting device to move multi-stage pump components, which not only reduces the number of employees required, reduces the labor intensity of employees, improves work efficiency, and reduces production costs, but also facilitates the alignment of components and greatly improves the assembly accuracy of the multi-stage pump.

Description

Technical Field

[0001] This utility model relates to a disassembly and assembly fixture suitable for multi-stage pumps, which can reduce the labor intensity of maintenance personnel, improve the maintenance efficiency and assembly accuracy of multi-stage pumps, and belongs to the field of non-positive displacement pump technology. Background Technology

[0002] A multistage pump has two or more impellers mounted on its shaft, enabling segmented, multi-stage water intake and discharge. The outlet section, intermediate stages, and inlet section are connected by six tension bolts evenly distributed around the pump shaft. Due to their advantages such as high head and high pressure, multistage pumps are widely used in water supply, metallurgy, and water treatment industries. However, multistage pumps present numerous challenges in routine maintenance due to difficulties in disassembly and reassembly, and the potential for inaccurate assembly. A common method for disassembling and assembling multistage pumps is to place the pump horizontally (with the pump shaft horizontal) on a maintenance platform, then manually remove the outlet section bearing housing, seals, balance disc, tension bolts, intermediate stages, and inlet section, eliminating any defects in the components before manually reassembling. Due to the lack of specialized tooling and the considerable weight of the impeller, at least four people are needed to move the intermediate section after it is removed from the pump shaft. The entire disassembly and assembly process requires the cooperation of multiple employees, which is not only labor-intensive and time-consuming, but also prone to damage from rubbing between components if the coordination among multiple people is poor, affecting the quality of maintenance and increasing the loss of spare parts and auxiliary materials. In addition, during horizontal assembly, sleepers need to be placed at the bottom of the intermediate section to prevent it from falling off. However, due to differences in the timing and position of the sleepers, the fit between components is not perfect, and the assembly accuracy is difficult to meet the design requirements. Therefore, designing a disassembly and assembly tooling suitable for multi-stage pumps is essential. Utility Model Content

[0003] The purpose of this utility model is to address the shortcomings of existing technologies by providing a multi-stage pump disassembly and assembly tool to improve the maintenance efficiency and assembly accuracy of multi-stage pumps and reduce the labor intensity of workers.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A multi-stage pump assembly / disassembly fixture includes a maintenance support and a hoisting device. The maintenance support includes a base plate, columns, a tray, and positioning pins. The base plate is placed horizontally on a maintenance platform. Multiple columns are vertically mounted on the base plate and correspond to different tension bolt holes on the pump body of the multi-stage pump. The lower end of each column is fixedly connected to the base plate, and the upper end passes through the tension bolt holes on the pump body and has a positioning hole that matches the positioning pin. The positioning pin is inserted into the positioning hole. The upper middle part of the column has a ladder corresponding to the pump body of the multi-stage pump. The tray is fixed in the middle of the base plate, and the lower end of the pump shaft of the multi-stage pump rests on the tray.

[0006] The aforementioned multi-stage pump assembly and disassembly fixture has an annular gasket fitted on each column. The lower surface of the annular gasket is in contact with the ladder platform, and the upper surface is in contact with the pump body of the multi-stage pump.

[0007] The aforementioned multi-stage pump assembly and disassembly fixture has a stud fixed to the lower part of the tray, and the lower end of the stud is screwed into a threaded hole in the middle of the base plate.

[0008] The aforementioned multi-stage pump assembly and disassembly fixture has a column whose lower end passes through the mounting hole on the base plate and is fixed by a fixing nut.

[0009] The aforementioned multi-stage pump assembly and disassembly fixtures include three or four columns.

[0010] The aforementioned multi-stage pump assembly and disassembly fixture includes a lifting device comprising a crossbeam, lifting straps, side lifting rings, a main lifting ring, and a main lifting chain hoist. The main lifting chain hoist is installed at the lifting point. The main lifting ring is fixed to the middle of the top surface of the crossbeam and connected to the hook of the main lifting chain hoist via a wire rope. Two side lifting rings are symmetrically fixed to the lower ends of both ends of the crossbeam. The upper ends of the two lifting straps are connected to the two side lifting rings respectively, and the lower ends are connected to the two sides of the object being lifted.

[0011] The aforementioned multi-stage pump assembly and disassembly tooling has a ring sleeve at the lower end of the lifting strap.

[0012] The aforementioned multi-stage pump assembly and disassembly fixture includes an adjusting chain hoist installed between the upper end of a lifting sling and a side lifting ring. The adjusting chain hoist is mounted on the side lifting ring, and its hook is connected to the upper end of the lifting sling.

[0013] This invention adopts a vertical disassembly and assembly method and uses a hoisting device to move multi-stage pump components. This not only reduces the number of employees required, lowers the labor intensity of employees, improves work efficiency, and reduces production costs, but also facilitates the alignment of components, greatly improving the assembly accuracy of the multi-stage pump. Attached Figure Description

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0015] Figure 1 This is a schematic diagram of the structure of the maintenance bracket of this utility model;

[0016] Figure 2 This is a sectional view of the maintenance support;

[0017] Figure 3 This is a structural schematic diagram of the hoisting device of this utility model;

[0018] Figure 4 This is a schematic diagram of the preparatory work before dismantling a multi-stage pump;

[0019] Figure 5 This is a schematic diagram of the process of disassembling a multi-stage pump using this utility model;

[0020] Figure 6 This is a schematic diagram of the assembly process of a multi-stage pump using this utility model;

[0021] Figure 7 This is a schematic diagram of a multi-stage pump assembled on a maintenance platform.

[0022] The following are the labels in the diagram: 1. Base plate, 2. Column, 3. Tray, 4. Fixing nut, 5. Positioning pin, 6. Positioning hole, 7. Annular washer, 8. Crossbeam, 9. Adjusting chain hoist, 10. Lifting belt, 11. Side lifting ring, 12. Main lifting ring, 13. Main lifting chain hoist, 14. Bearing body, 15. Pump connector, 16. Tensioning bolt, 17. Pump body, 18. Pump shaft, 19. Ladder platform, 20. Ring sleeve. Detailed Implementation

[0023] This utility model mainly includes a maintenance bracket and a hoisting device.

[0024] See Figure 1 and Figure 2 The maintenance support includes a base plate 1, columns 2, a tray 3, a fixing nut 4, a positioning pin 5, a positioning hole 6, and an annular gasket 7. The base plate 1 is placed horizontally on the maintenance platform. There are three or four columns 2. If there are three columns, they are arranged in an equilateral triangle. The figure shows four columns 2 (the following description uses four columns 2 as an example). The four columns 2 are arranged in a rectangle and are vertically fixed on the base plate 1. The lower end of each column 2 passes through the mounting hole on the base plate 1 and is fixed by the fixing nut 4. The upper end passes through the tension bolt hole on the pump body 17 and is provided with a positioning hole 6 that matches the positioning pin 5. The upper middle part of the column 2 is provided with a ladder 19 for supporting the pump body 17. The annular gasket 7 is fitted on the outside of the column 2 and its lower surface is in contact with the ladder 19. After the upper ends of the four columns 2 pass through the four tension bolt holes on the pump body 17, the pump body 17 presses on the annular gasket 7. The annular gasket 7 can increase the contact area between the maintenance bracket and the pump body 17 and avoid damage caused by concentrated force on the pump body 17. Four positioning pins 5 are inserted into the positioning holes 6 at the upper ends of the four columns 2 to position the pump body 17. The lower part of the tray 3 is provided with studs. The lower end of the studs is screwed into the threaded hole in the middle of the base plate 1. The tray 3 is used to support the pump shaft 18 of the multi-stage pump. The studs at the bottom of the tray 3 are used to adjust the height of the tray 3 so that the tray 3 and the four columns 2 jointly bear the weight of the multi-stage pump.

[0025] The function of the maintenance support is to support the multi-stage pump, keeping it in a vertical position during disassembly and assembly. This facilitates the disassembly, assembly, and hoisting of various components, as well as the alignment of components, thus improving assembly accuracy.

[0026] See Figure 3The hoisting device includes a crossbeam 8, an adjusting chain hoist 9, hoisting belts 10, side lifting rings 11, a main lifting ring 12, and a main hoisting chain hoist 13. The main hoisting chain hoist 13 is installed at the hoisting point. The main lifting ring 12 is fixed in the middle of the top surface of the crossbeam 8. The hook of the main hoisting chain hoist 13 is connected to the main lifting ring 12 through a wire rope. The two side lifting rings 11 are symmetrically fixed at the lower ends of the crossbeam 8. The upper ends of the two hoisting belts 10 are connected to the two side lifting rings 11 respectively, and the lower ends are provided with ring sleeves 20 for easy connection with the hoisted object.

[0027] Lifting devices are used to lift components during the assembly and disassembly of multi-stage pumps, improving the maintenance efficiency of multi-stage pumps and reducing the labor intensity of employees.

[0028] During the disassembly and assembly of the multi-stage pump, the lower ends of the two lifting belts 10 are connected to the two sides of the component being lifted via rings 20. In order to keep the component being lifted balanced, an adjusting chain hoist 9 is installed between the upper end of one lifting belt 10 and the side lifting ring 11. By adjusting the chain hoist 9, the height difference between the two ends of the component being lifted can be adjusted to keep it within the set range.

[0029] The specific method for disassembling and assembling a multi-stage pump using this utility model is as follows:

[0030] Preparation:

[0031] S1: Lift the multistage pump to the maintenance platform and clean its exterior, such as... Figure 4 As shown in (a);

[0032] S2: Remove the front and rear bearing housings, sealing components, and balance disc, such as Figure 4 As shown in (b);

[0033] S3: Remove the four symmetrical rectangular tension bolts 16 from the multistage pump (Note: retain at least two symmetrical tension bolts in a tightened state) to prepare for disassembly of the vertical multistage pump, such as... Figure 4 As shown in (c);

[0034] Disassembly of a multistage pump:

[0035] S4: Use an electric hoist to vertically lift the multistage pump and fix it on the maintenance bracket (the upper ends of the four columns 2 pass through the four tension bolt holes on the pump body 17, the pump body 17 is pressed on the annular gasket 7, and the four positioning pins 5 are inserted into the positioning holes 6 at the upper ends of the four columns 2. Adjust the height of the tray 3 by rotating it so that the pump shaft 18 of the multistage pump rests on the tray 3). Then remove the other tension bolts 16 to put the pump body in a natural connection state, such as... Figure 5As shown in (a); mark the pump outlet section, intermediate section, impeller, and impeller bushing, and dismantle them step by step using a hoisting device, placing them sequentially on the maintenance platform. Note: When dismantling each component, first loosen them using a hammer, copper rod, and heating device. When hoisting out components, someone should gently shake them to prevent rubbing and jamming caused by uneven gaps. Figure 5 (b)- Figure 5 As shown in (f);

[0036] S5: Remove the pump shaft and lower the inlet section from the maintenance bracket, placing it horizontally. Figure 5 (g) and Figure 5 As shown in (h);

[0037] S6: Clean, polish, and survey each component, eliminate defects in each component, and conduct a pre-assembly.

[0038] Assembly of multistage pumps:

[0039] S7: Pass the pump shaft with sleeve and key through the inlet section, and simultaneously install the inlet section seal and bearing housing. Note: Do not fill with sealing packing, such as... Figure 6 (a) and Figure 6 (b) explains the bearing housing condition before installation: The multistage pump uses NU series cylindrical roller bearings or deep groove ball bearings with fixed inner rings and sliding outer rings in the bearing housing, which does not affect the measurement of "center alignment" and movement.

[0040] S8: Vertically lift the inlet section, its accessories, and the pump shaft together and secure them to the maintenance bracket, such as... Figure 6 As shown in (c);

[0041] S9: After laying a layer of barley paper pad on the inlet section, reinstall the first-stage impeller and impeller sleeve, ensuring the impeller is close to the front shaft sleeve. Then, using a pry bar and the tray as a fulcrum, pry the pump shaft until the center of the first-stage impeller outlet aligns with the center of the first-stage guide vane inlet. At this point, make a mark on the shaft front end relative to the packing gland end face for later inspection of the impeller and guide vane alignment. Note: When aligning the first-stage impeller outlet center with the guide vane inlet center, the impeller should be close to the front shaft sleeve and maintain an appropriate gap from the inlet section. Figure 6 As shown in (c);

[0042] S10: After laying a layer of barley paper pad on the intermediate section, install the secondary impeller, impeller sleeve, intermediate section, and third-stage impeller, up to the outlet section. Reinstall the two tension bolts and tighten them. Special emphasis: After installing each intermediate section, lift the pump shaft and rotate it 180° to observe whether there is resistance or friction with other parts during rotation. If so, adjust it promptly. Simultaneously measure the lifting height of the pump shaft as a reference for the total axial movement of the pump unit. Figure 6 (d)- Figure 6As shown in (h); install the tension bolts diagonally and tighten them to prepare for the next lifting step, as follows. Figure 6 (i) Figure 6 As shown in (j);

[0043] The multistage pump is finally assembled on the maintenance platform:

[0044] S11: Lift the pump body off the maintenance bracket and place it on the maintenance platform, such as... Figure 7 As shown in (a), a specially made retaining sleeve with a length greater than the sum of the balance disc hub length and the total axial movement was installed. The shaft sleeve was then installed and tightened with a lock nut. The total axial movement of the multi-stage pump was measured. After removing the specially made retaining sleeve, the balance disc was installed and tightened, and the operational axial movement was measured. Total axial movement S 总 With the running axial movement S 运 The relationship between them is: S 总 / 2-0.5=S 运 ,like Figure 7 As shown in (b).

[0045] S12: After all data meet the design requirements, reinstall the outlet section seal and bearing body, manually rotate the pump, and observe whether there is resistance during rotation or rubbing against other parts. If so, adjust promptly. If not, reinstall other auxiliary components of the pump set, add sealing packing, and adjust the tightness of the packing gland. Figure 7 As shown in (c);

[0046] S13: Install a pump connection, clean the site, and set up offline backup. Figure 7 (c) is shown. Note: Pump connection must be heated during installation and cannot be forcibly installed.

[0047] The beneficial effects of this utility model are:

[0048] 1) Reduce manpower and increase efficiency. Replacing traditional horizontal disassembly and assembly with vertical disassembly and assembly, and replacing the need for multiple people to move parts with hoisting equipment, reduces the number of on-site maintenance personnel, lowers labor intensity, and improves work efficiency. It also avoids collisions between parts due to poor coordination among multiple people during disassembly and assembly, reducing the loss of spare parts and auxiliary materials, and lowering production costs. Compared with horizontal disassembly and assembly, the maintenance days are shortened from 6 days to 4 days, labor intensity is reduced by 60%, and the number of maintenance personnel is reduced from 7 to 4.

[0049] 2) High installation accuracy. Vertical assembly facilitates component alignment, allows for initial verification of pump unit technical requirements at the beginning of reassembly, and further verification of technical requirements during reassembly of each stage, ensuring installation accuracy.

Claims

1. A multi-stage pump disassembly tool, characterized by, The system includes a maintenance support and a hoisting device. The maintenance support includes a base plate (1), columns (2), a tray (3), and a positioning pin (5). The base plate (1) is placed horizontally on the maintenance platform. Multiple columns (2) are vertically arranged on the base plate (1) and correspond to different tension bolt holes on the pump body (17) of the multi-stage pump. The lower end of each column (2) is fixedly connected to the base plate (1), and the upper end passes through the tension bolt hole on the pump body (17) and is provided with a positioning hole (6) that matches the positioning pin (5). The positioning pin (5) is inserted into the positioning hole (6). The upper middle part of the column (2) is provided with a platform (19) corresponding to the pump body (17) of the multi-stage pump. The tray (3) is fixed in the middle of the base plate (1), and the lower end of the pump shaft (18) of the multi-stage pump rests on the tray (3).

2. The multi-stage pump disassembly tool of claim 1, wherein, Each column (2) is fitted with an annular gasket (7), the lower surface of which is in contact with the platform (19) and the upper surface is in contact with the pump body (17) of the multi-stage pump.

3. The multi-stage pump dismounting tool according to claim 1 or 2, characterized in that The lower part of the tray (3) is fixed with a stud, and the lower end of the stud is screwed into the threaded hole in the middle of the base plate (1).

4. The multi-stage pump disassembly tool of claim 3, wherein, The lower end of the column (2) passes through the mounting hole on the base plate (1) and is fixed by the fixing nut (4).

5. The multi-stage pump disassembly tool of claim 4, wherein, The column (2) is provided in three or four pieces.

6. The multi-stage pump disassembly tool of claim 5, wherein, The hoisting device includes a crossbeam (8), hoisting belts (10), side lifting rings (11), main lifting rings (12), and a total hoisting chain hoist (13). The total hoisting chain hoist (13) is installed at the hoisting point. The main lifting ring (12) is fixed in the middle of the top surface of the crossbeam (8) and connected to the hook of the total hoisting chain hoist (13) by a wire rope. The two side lifting rings (11) are symmetrically fixed at the lower ends of the crossbeam (8). The upper ends of the two hoisting belts (10) are connected to the two side lifting rings (11) respectively, and the lower ends are connected to the two sides of the hoisted object respectively.

7. The multi-stage pump disassembly tool of claim 6, wherein, The lower end of the lifting sling (10) is provided with a loop (20).

8. The multi-stage pump disassembly tool of claim 7, wherein, An adjusting chain hoist (9) is installed between the upper end of a lifting sling (10) and a side lifting ring (11). The adjusting chain hoist (9) is installed on the side lifting ring (11), and the hook of the adjusting chain hoist (9) is connected to the upper end of the lifting sling (10).

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