A multi-stage water pump maintenance platform and its use method

Abstract

The present invention discloses a multi-stage water supply pump maintenance platform and a method for using the same. The multi-stage water supply pump maintenance platform comprises: a base, a middle component is provided on the upper part of the base, a front-end component is provided at the front end of the base, and a rear-end component is provided at the rear end of the base, wherein the front-end component and the rear-end component are mirror-symmetrical; the middle component comprises two middle jacks, the two middle jacks are mounted in two rectangular grooves of the base in a one-to-one correspondence, the tops of the two middle jacks are connected to the groove-shaped brackets, the two sides of the base are respectively connected to the retaining walls, and the lifting and lowering adjustment knobs of the two middle jacks extend out from the two rectangular holes of the front retaining wall in a one-to-one correspondence. The present invention effectively solves the problems of poor precision of the wedge-shaped fit of the middle section of the multi-stage water supply pump during the existing maintenance process, the easy damage to the roundness of the middle section, and the deviation of the measurement data, optimizes the precision of the assembly of the multi-stage water supply pump after maintenance, and improves the efficiency of maintenance and assembly.

Description

Technical Field

[0001] The invention belongs to the technical field of water pump maintenance, and in particular relates to a multi-stage water pump maintenance platform and a use method thereof. Background Art

[0002] At present, most boilers used in industrial and mining enterprises adopt high-pressure multi-stage water supply pumps for water supply. For a high-pressure, high-speed, multi-stage boiler water supply pump, the maintenance and assembly requirements are very high, which will directly affect the normal operation and efficiency of the water supply pump.

[0003] At present, in the maintenance of high-pressure multi-stage water supply pumps, their disassembly, splitting and assembly are mostly carried out with the help of ordinary pump stands, whose function is only to serve as a bracket. Therefore, the following problems will inevitably arise during the maintenance process: First, due to the wedge-shaped fit between the various stages of the middle section of the pump, since the ordinary pump stand only supports the two ends of the pump shaft, the precision of the wedge-shaped fit will be affected under the action of its own gravity, resulting in poor sealing between the various stages of the middle section; second, the stoppers of the middle section are easily squeezed and stuck to each other during disassembly, resulting in the need to apply a large external force to the gap of the stoppers to forcibly separate them, which will cause damage to the roundness of the middle section; third, it is inconvenient to measure the data of key components (such as: pump shaft curvature, end face runout data, etc.) after the multi-stage water supply pump is disassembled, which will lead to deviation in the measurement data and reduce the reliability of the pump shaft and impeller.

[0004] The Chinese patent specification discloses a multi-stage centrifugal pump maintenance device and method (publication number CN105987026A), specifically disclosing the following: It includes a flange connected to the inlet section of the multi-stage centrifugal pump, an intermediate bracket that primarily bears weight and provides support, an adjustment plate mounted on the bracket, and an adjustment bolt mounted in the middle of the adjustment plate to adjust its position according to the length of the pump shaft. The uppermost portion of the adjustment bolt is equipped with a support plate to support pump shafts of varying sizes, and the lower portion is a fixed base plate. The technical solution adopted by this invention is to place the entire pump body vertically, which makes the lifting process inconvenient and unstable, and also affects the accuracy of testing and calibration. Summary of the Invention

[0005] 1. Technical Problems to be Solved

[0006] The present invention proposes a multi-stage water supply pump maintenance platform and its use method, which aims to solve the problems of poor precision of the middle section wedge fit, easy damage to the middle section roundness and deviation of the measurement data during the existing maintenance process of the multi-stage water supply pump.

[0007] 2. Technical Solution

[0008] In order to achieve the above objectives, the present invention adopts the following technical solutions.

[0009] The multi-stage water pump maintenance platform of the present invention comprises:

[0010] The base has a middle component on its upper part, a front-end component on its front end, and a rear-end component on its rear end, and the front-end component is mirror-symmetrical to the rear-end component; the middle component includes two middle jacks, which are installed one-to-one in two rectangular grooves of the base, and the tops of the two middle jacks are connected to the groove-shaped brackets. The two sides of the base are connected to the retaining walls respectively, and the lifting adjustment knobs of the two middle jacks extend one-to-one from the two rectangular holes of the front retaining wall.

[0011] Furthermore, the front-end assembly includes a front-end jack, the lower part of the front-end jack is rotatably connected to the front pitch-adjusting screw, the other end of the front pitch-adjusting screw is threadedly connected to the front end face of the base, the front-end jack is slidably connected to the dovetail groove on the front-end box body, the top of the front-end jack is connected to the V-shaped front-end support block, the front side of the front-end support block is provided with a front-end vertical plate, the upper part of the front-end vertical plate is threadedly connected to the front-end pump shaft pin, the lower part of the front-end vertical plate is slidably connected to the strip groove on the front-end box body, the upper part of the front-end face of the front-end box body is threadedly connected to the front fastening screw, and the lower part of the front-end face of the front-end box body is connected to the U-shaped front clamp.

[0012] Furthermore, the rear end component includes a rear end jack, the lower part of the rear end jack is rotatably connected to the rear pitch adjusting screw, the other end of the rear pitch adjusting screw is threadedly connected to the rear end face of the base, the rear end jack is slidably connected to the dovetail groove on the rear end box body, the top of the rear end jack is connected to the V-shaped rear end support block, the rear side of the rear end support block is provided with a rear end vertical plate, the upper part of the rear end vertical plate is threadedly connected to the rear end pump shaft pin, the lower part of the rear end vertical plate is slidably connected to the strip groove on the rear end box body, the upper part of the rear end face of the rear end box body is threadedly connected to the rear fastening screw, and the lower part of the rear end face of the rear end box body is connected to the U-shaped rear clamp.

[0013] Preferably, the middle jack, the front end jack and the rear end jack are all scissor-type jacks, which include a left upper arm, a left lower arm, a right upper arm, a right lower arm, and a threaded rod. The upper end of the left upper arm is rotatably connected to the support plate through the upper pin shaft on the left side, the lower end of the left upper arm is rotatably connected to the upper end of the left lower arm through the middle pin shaft on the left side, and the lower end of the left lower arm is rotatably connected to the support plate through the lower pin shaft on the left side; the upper end of the right upper arm is rotatably connected to the support plate through the upper pin shaft on the right side, the lower end of the right lower arm is rotatably connected to the upper end of the right lower arm through the middle pin shaft on the right side, and the lower end of the right lower arm is rotatably connected to the support plate through the lower pin shaft on the right side; the middle pin shaft on the right side is rotatably connected to the threaded sleeve, the threaded rod is threadedly connected to the threaded sleeve, the left end of the threaded rod is rotatably connected to the connecting head, the other end of the connecting head is rotatably connected to the middle pin shaft on the left side, and the right end of the threaded rod is connected to the lifting adjustment knob.

[0014] Furthermore, it also includes a basket adjustment component, which includes a basket adjustment rod. The upper part of the basket adjustment rod is connected to the shaft sleeve through a screw rod, and the lower part of the basket adjustment rod is threadedly connected to a bolt, and the end of the bolt is connected to the rotating handle.

[0015] The method for using the multi-stage water pump maintenance platform of the present invention includes the following specific steps:

[0016] 1) Remove the front vertical plate, and ensure that the front supporting block on the front jack and the rear supporting block on the rear jack are at the lowest height. Hoist the multi-stage water supply pump to be repaired onto the grooved supporting piece on the multi-stage water supply pump repair platform;

[0017] 2) Turn the two middle jacks at the same time to make the trough-shaped support slowly rise and support the multi-stage water pump horizontally;

[0018] 3) Remove the coupling, mechanical seal assembly, bearing bushing, balance plate, bearing seat and other accessories of the multi-stage water pump;

[0019] 4) Slightly lift the shaft head on the water inlet side of the multi-stage water pump shaft, and place a protective copper sheet under the shaft hole on the water inlet side;

[0020] 5) Insert the bushing of the basket adjustment assembly into the shaft head on the water inlet side of the pump shaft, place the bolt in the U-shaped notch of the clamp, turn the handle to the bottom of the clamp, turn the basket adjustment lever, pull down the shaft head on the water inlet side, and slightly lift the shaft head on the water outlet side;

[0021] 6) Use the diagonal disassembly method to remove the cylinder bolts of the multi-stage water pump and mark each component;

[0022] 7) Use a copper rod to hit the inner side of the foot of the outlet section to separate the outlet section from the middle section and lift it out;

[0023] 8) Remove the outlet ring, impeller and other parts;

[0024] 9) Starting from the last level in the middle section, use a copper rod to hammer each level in the middle section and remove each level in the middle section;

[0025] 10) Turn the rear pitch adjustment screw so that the V-shaped rear end support block is located below the shaft head on the water outlet side. Rotate the crank handle of the rear end jack so that the V-shaped rear end support block rises and contacts the shaft head on the water outlet side.

[0026] 11) Remove the sleeve on the shaft head on the water inlet side, turn the front pitch screw so that the V-shaped front end support block is located below the shaft head on the water inlet side, and rotate the crank of the front jack so that the V-shaped front end support block rises and contacts the shaft head on the water inlet side;

[0027] 12) Install the front vertical plate on the front box body, adjust the front pump shaft ejector pin on the front vertical plate and the rear pump shaft ejector pin on the rear vertical plate respectively, and adjust the front jack and rear jack to rise or fall at the same time, push the front pump shaft ejector pin into the correction blind hole on the shaft head end face on the water inlet side, push the rear pump shaft ejector pin on the rear vertical plate into the correction blind hole on the shaft head end face on the water outlet side, and then tighten the front fastening screw and the rear fastening screw respectively;

[0028] 13) Place a dial indicator on the multi-stage water supply pump maintenance platform to measure the pump shaft bending of the multi-stage water supply pump and record it;

[0029] 14) After the repair of the impeller, mouth ring and other components is completed, the data measurement of the relevant components of the multi-stage water supply pump and the assembly of the multi-stage water supply pump will be carried out in sequence.

[0030] The data measurement of the multi-stage water supply pump related components specifically includes the following steps:

[0031] 1) Remove the front and rear vertical plates at both ends of the multi-stage water supply pump shaft;

[0032] 2) Insert the shaft sleeve of the basket adjustment assembly into the shaft head on the water inlet side of the pump shaft, place the bolt in the U-shaped notch of the clamp, turn the handle to the bottom of the clamp, turn the basket adjustment rod, and tighten the shaft head on the water inlet side of the pump shaft downward;

[0033] 3) Turn the crank of the rear jack, and the V-shaped rear support block will drop to the lowest position;

[0034] 4) Assemble the impeller, ring, seal and other components in sequence, and set a dial indicator on the grooved support to measure the runout and deflection of the above components one by one;

[0035] 5) Repair or replace substandard parts again until all parts meet the standards.

[0036] The assembly of the multi-stage water supply pump specifically comprises the following steps:

[0037] 1) Insert the impeller, mouth ring, middle section, sealing ring and water inlet section into the shaft head on the water outlet side of the pump shaft in sequence;

[0038] 2) Insert the cylinder bolts and pre-tighten them;

[0039] 3) Remove the shaft sleeve on the water inlet side shaft head, take out the protective copper sheet at the bottom of the water inlet shaft hole, and simultaneously rotate the two middle jacks to lower the trough-shaped support and separate it from the middle section of the multi-stage water feed pump;

[0040] 4) Select four measuring points at equal distances along the circumference of the middle section, measure the axial length of the middle section starting from each measuring point, and adjust the tightness of the cylinder bolts based on the measured data;

[0041] 5) Install mechanical seal components, bearings, balance plates, couplings, etc. to complete the assembly of the multi-stage water supply pump.

[0042] 3. Beneficial Effects

[0043] The present invention provides a multi-stage water supply pump maintenance platform and a method for using the same, which effectively solves the problems of poor precision of the wedge-shaped fit of the middle section, easy damage to the roundness of the middle section, and deviation in measurement data that occur during the existing maintenance process of the multi-stage water supply pump, optimizes the accuracy of assembly of the multi-stage water supply pump after maintenance, and improves the efficiency of maintenance and assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a schematic diagram of the three-dimensional structure of the multi-stage water supply pump maintenance platform of the present invention.

[0045] Figure 2 It is a schematic diagram of the three-dimensional structure of the front-end component and the rear-end component of the multi-stage water supply pump maintenance platform of the present invention.

[0046] Figure 3 The utility model is a schematic diagram of the main structure of the scissor jack of the multi-stage water supply pump maintenance platform of the present invention.

[0047] Figure 4 It is a schematic diagram of the three-dimensional structure of the basket adjustment component of the multi-stage water pump maintenance platform of the present invention.

[0048] Figure 5 This is a schematic diagram of the use of the multi-stage water pump maintenance platform of the present invention Figure I .

[0049] Figure 6 This is a schematic diagram of the use of the multi-stage water pump maintenance platform of the present invention Figure II . DETAILED DESCRIPTION

[0050] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can have a clearer understanding.

[0051] Example 1

[0052] As the multi-stage water pump maintenance platform of the present invention, Figure 1 As shown, it includes a base 1, a middle component 2 is provided on the upper part of the base, a front end component 3 is provided at the front end of the base, and a rear end component 4 is provided at the rear end of the base, and the front end component 3 is mirror-symmetrical to the rear end component 4; the middle component 2 includes two middle jacks 21, and the two middle jacks 21 are installed in two rectangular grooves of the base in a one-to-one correspondence. The tops of the two middle jacks 21 are connected to the groove-shaped bracket 22, and the two sides of the base are respectively connected to the retaining wall 23, and the lifting adjustment knobs 210 of the two middle jacks 21 extend out from the two rectangular holes of the front retaining wall in a one-to-one correspondence.

[0053] like Figure 2 As shown, the front end assembly 3 includes a front end jack 31, the lower part of the front end jack is rotatably connected to the front pitch adjusting screw 311, the other end of the front pitch adjusting screw is threadedly connected to the front end face of the base 1, the front end jack is slidably connected to the dovetail groove on the front end box 32, and rotating the front pitch adjusting screw can make the front end jack move back and forth on the front end box 32, the top of the front end jack is connected to the V-shaped front end support block 33, the front side of the front end support block 33 is provided with a front end vertical plate 34, the upper part of the front end vertical plate is threadedly connected to the front end pump shaft pin 35, the lower part of the front end vertical plate 34 is slidably connected to the strip groove on the front end box 32, the upper part of the front end face of the front end box is threadedly connected to the front fastening screw 36, which is used to fasten the front end vertical plate 34, and the lower part of the front end face of the front end box 32 is connected to the U-shaped front clamp 310.

[0054] like Figure 2 As shown, the rear end assembly 4 includes a rear end jack 41, the lower part of the rear end jack is rotatably connected to the rear pitch adjusting screw 411, and the other end of the rear pitch adjusting screw is threadedly connected to the rear end face of the base 1, and the rear end jack is slidably connected to the dovetail groove on the rear end box 42. Rotating the rear pitch adjusting screw can make the rear end jack move back and forth on the rear end box 42, and the top of the rear end jack is connected to the V-shaped rear end support block 43. The rear side of the rear end support block 43 is provided with a rear end vertical plate 44, the upper part of the rear end vertical plate is threadedly connected to the rear end pump shaft pin 45, the lower part of the rear end vertical plate 44 is slidably connected to the strip groove on the rear end box 42, the upper part of the rear end face of the rear end box is threadedly connected to the rear fastening screw 46 for fastening the rear end vertical plate 44, and the lower part of the rear end face of the rear end box 42 is connected to the U-shaped rear clamp 410.

[0055] like Figure 3 As shown, in this embodiment, the middle jack 21, the front jack 31, and the rear jack 41 are all scissor jacks, which include a left upper arm 211, a left lower arm 212, a right upper arm 213, a right lower arm 214, and a threaded rod 221. The upper end of the left upper arm is rotatably connected to the supporting plate 216 via the upper pin shaft 215 on the left side, the lower end of the left upper arm is rotatably connected to the upper end of the left lower arm 212 via the middle pin shaft 217 on the left side, and the lower end of the left lower arm 212 is rotatably connected to the supporting plate 219 via the lower pin shaft 218 on the left side. The upper end of the right upper arm 213 is rotatably connected to the supporting plate via the upper pin shaft on the right side, the lower end of the right upper arm 213 is rotatably connected to the upper end of the right lower arm 214 via the middle pin shaft on the right side, and the lower end of the right lower arm 214 is rotatably connected to the supporting plate via the lower pin shaft on the right side; the middle pin shaft on the right side is rotatably connected to the threaded sleeve 220, the threaded rod 221 is threadedly connected to the threaded sleeve, the left end of the threaded rod is rotatably connected to the connecting head 222, the other end of the connecting head is rotatably connected to the middle pin shaft on the left side, and the right end of the threaded rod is connected to the lifting adjustment knob (210).

[0056] like Figure 4As shown, the multi-stage water pump maintenance platform of the present invention also includes a basket adjustment component 5, which includes a basket adjustment rod 51, the upper part of the basket adjustment rod is connected to the shaft sleeve 52 through a screw, the lower part of the basket adjustment rod is threadedly connected to the bolt 53, and the end of the bolt is connected to the rotating handle 54.

[0057] The method for using the multi-stage water pump maintenance platform of the present invention includes the following specific steps:

[0058] 1) Remove the front vertical plate 34, and ensure that the front support block 33 on the front jack 31 and the rear support block 43 on the rear jack 41 are at the lowest height. Hoist the multi-stage water supply pump to be repaired onto the grooved support 22 of the multi-stage water supply pump repair platform;

[0059] 2) Simultaneously rotate the two middle jacks 21 to slowly raise the trough-shaped support 22 and horizontally support the multi-stage water pump;

[0060] 3) Remove the coupling, mechanical seal assembly, bearing bushing, balance plate, bearing seat and other accessories of the multi-stage water pump;

[0061] 4) If Figure 5 As shown, slightly lift the shaft head of the multi-stage water supply pump shaft 63 on the water inlet section 61 side, and place a protective copper sheet under the shaft hole on the water inlet section side;

[0062] 5) If Figure 5 As shown, insert the shaft sleeve 52 of the basket adjustment assembly 5 into the shaft head on the water inlet side of the pump shaft 63, place the bolt 53 in the U-shaped notch of the clamp 310, turn the handle 54 to the bottom of the clamp, turn the basket adjustment rod 51, pull down the shaft head on the water inlet side, and slightly lift the shaft head on the water outlet side;

[0063] 6) Use the diagonal disassembly method to remove the cylinder bolts of the multi-stage water pump and mark each component;

[0064] 7) Use a copper rod to hit the inner side of the outlet section footing to separate the outlet section from the middle section 62 and lift it out;

[0065] 8) Remove the outlet ring, impeller and other parts;

[0066] 9) Starting from the last stage of the middle section 62, hammer each stage of the middle section 62 with a copper rod and remove each stage of the middle section;

[0067] 10) If Figure 6 As shown, the rear pitch adjusting screw 411 is rotated to position the V-shaped rear end support block 43 below the shaft head on the water outlet side. The crank of the rear end jack 41 is rotated to cause the V-shaped rear end support block 43 to rise and contact the shaft head on the water outlet side.

[0068] 11) If Figure 6As shown, remove the sleeve 52 on the shaft head on the water inlet side, rotate the front pitch screw 311, so that the V-shaped front end support block 33 is located below the shaft head on the water inlet side, and rotate the crank of the front end jack 31, so that the V-shaped front end support block 33 rises and contacts the shaft head on the water inlet side;

[0069] 12) If Figure 6 As shown, the front vertical plate 34 is installed on the front box body 42, and the front pump shaft ejector pin 35 on the front vertical plate 34 and the rear pump shaft ejector pin 45 on the rear vertical plate 44 are adjusted respectively. At the same time, the front jack 31 and the rear jack 41 are adjusted to rise or fall. The front pump shaft ejector pin 35 is pushed into the correction blind hole on the end face of the shaft head on the water inlet side, and the rear pump shaft ejector pin 45 on the rear vertical plate 44 is pushed into the correction blind hole on the end face of the shaft head on the water outlet side. Then, the front fastening screw 36 and the rear fastening screw 46 are tightened respectively.

[0070] 13) If Figure 6 As shown, a dial indicator 7 is placed on the multi-stage water supply pump maintenance platform to measure the pump shaft bending of the multi-stage water supply pump and record it;

[0071] 14) After the repair of the impeller, mouth ring and other components is completed, the data measurement of the relevant components of the multi-stage water supply pump and the assembly of the multi-stage water supply pump will be carried out in sequence.

[0072] The data measurement of the multi-stage water supply pump related components specifically includes the following steps:

[0073] 1) Remove the front end plate 34 and the rear end plate 44 at both ends of the multi-stage water supply pump shaft;

[0074] 2) Insert the shaft sleeve 52 of the basket adjustment assembly 5 into the shaft head on the water inlet side of the pump shaft, place the bolt 53 into the U-shaped notch of the clamp 310, turn the handle 54 to the bottom of the clamp, and turn the basket adjustment rod 51 to tighten the shaft head on the water inlet side of the pump shaft downward;

[0075] 3) Turn the crank of the rear jack 41, and the V-shaped rear support block 43 drops to the lowest position;

[0076] 4) Assemble the impeller, ring, seal and other components in sequence, and set a dial indicator 7 on the grooved support 22 to measure the runout and deflection of the above components one by one;

[0077] 5) Repair or replace substandard parts again until all parts meet the standards.

[0078] The assembly of the multi-stage water supply pump specifically comprises the following steps:

[0079] 1) Insert the impeller, mouth ring, middle section, sealing ring and water inlet section into the shaft head on the water outlet side of the pump shaft in sequence;

[0080] 2) Insert the cylinder bolts and pre-tighten them;

[0081] 3) Remove the shaft sleeve 52 on the water inlet side shaft head, remove the protective copper sheet at the bottom of the water inlet shaft hole, and simultaneously rotate the two middle jacks 21 to lower the trough-shaped support 22 and separate it from the middle section of the multi-stage water supply pump;

[0082] 4) Select four measuring points at equal distances along the circumference of the middle section, measure the axial length of the middle section starting from each measuring point, and adjust the tightness of the cylinder bolts based on the measured data;

[0083] 5) Install mechanical seal components, bearings, balance plates, couplings, etc. to complete the assembly of the multi-stage water supply pump.

[0084] The present invention provides a multi-stage water supply pump maintenance platform and a method for using the same, which effectively solves the problems of poor precision of the wedge-shaped fit of the middle section, easy damage to the roundness of the middle section, and deviation in measurement data that occur during the existing maintenance process of the multi-stage water supply pump, optimizes the accuracy of assembly of the multi-stage water supply pump after maintenance, and improves the efficiency of maintenance and assembly.

[0085] The present invention is not limited to the above-mentioned specific embodiments. Various improvements made by those skilled in the art to the technical solution based on the concept of the present invention should fall within the scope of protection required by the present invention.

Claims

1. A multi-stage water pump maintenance platform, comprising a base (1), characterized in that: The upper part of the base is provided with a middle component (2), the front end of the base is provided with a front end component (3), and the rear end of the base is provided with a rear end component (4), and the front end component (3) and the rear end component (4) are mirror-symmetrical; the middle component (2) includes two middle jacks (21), and the two middle jacks (21) are installed in two rectangular grooves of the base in a one-to-one correspondence. The tops of the two middle jacks (21) are connected to the groove-shaped bracket (22), and the two sides of the base are respectively connected to the retaining wall (23). The two middle jacks (2 1) of the lifting adjustment knob (210) extends out from the two rectangular holes of the front side retaining wall in a one-to-one correspondence; the front end assembly (3) includes a front end jack (31), the lower part of the front end jack is rotatably connected to the front pitch screw (311), the other end of the front pitch screw is threadedly connected to the front end surface of the base (1), the front end jack is slidably connected to the dovetail groove on the front end box (32), the top of the front end jack is connected to the V-shaped front end support block (33), the front side of the front end support block (33) is provided with a front end vertical plate (34), the front end The upper part of the vertical plate is threadedly connected to the front pump shaft ejector pin (35), the lower part of the front vertical plate (34) is slidably connected to the strip groove on the front box (32), the upper part of the front end surface of the front box is threadedly connected to the front fastening screw (36), and the lower part of the front end surface of the front box (32) is connected to the U-shaped front clamp (310); the rear end assembly (4) includes a rear end jack (41), the lower part of the rear end jack is rotatably connected to the rear pitch adjustment screw (411), the other end of the rear pitch adjustment screw is threadedly connected to the rear end surface of the base (1), and the rear end assembly (4) includes a rear end jack (41), the lower part of the rear end jack is rotatably connected to the rear pitch adjustment screw (411), and the other end of the rear pitch adjustment screw is threadedly connected to the rear end surface of the base (1). The rear end jack is slidably connected to the dovetail groove on the rear end box (42), the top of the rear end jack is connected to the V-shaped rear end support block (43), the rear side of the rear end support block (43) is provided with a rear end vertical plate (44), the upper part of the rear end vertical plate is threadedly connected to the rear end pump shaft ejector pin (45), the lower part of the rear end vertical plate (44) is slidably connected to the strip groove on the rear end box (42), the upper part of the rear end surface of the rear end box is threadedly connected to the rear fastening screw (46), and the lower part of the rear end surface of the rear end box (42) is connected to the U-shaped rear clamp (410).

2. The multi-stage water pump maintenance platform according to claim 1 is characterized in that: The middle jack (21), the front jack (31), and the rear jack (41) are all scissor jacks, which include a left upper arm (211), a left lower arm (212), a right upper arm (213), a right lower arm (214), and a threaded rod (221). The upper end of the left upper arm is rotatably connected to the support plate (216) through the upper pin shaft (215) on the left side, the lower end of the left upper arm is rotatably connected to the upper end of the left lower arm (212) through the middle pin shaft (217) on the left side, and the lower end of the left lower arm (212) is rotatably connected to the support plate (219) through the lower pin shaft (218) on the left side. The upper end of the right upper arm (213) is rotatably connected to the support plate via the upper pin shaft on the right side, the lower end of the right upper arm (213) is rotatably connected to the upper end of the right lower arm (214) via the middle pin shaft on the right side, and the lower end of the right lower arm (214) is rotatably connected to the support plate via the lower pin shaft on the right side; the middle pin shaft on the right side is rotatably connected to the threaded sleeve (220), the threaded rod (221) is threadedly connected to the threaded sleeve, the left end of the threaded rod is rotatably connected to the connector (222), the other end of the connector is rotatably connected to the middle pin shaft on the left side, and the right end of the threaded rod is connected to the lifting adjustment knob (210).

3. The multi-stage water pump maintenance platform according to claim 2 is characterized in that: It also includes a basket adjustment assembly (5), which includes a basket adjustment rod (51), the upper part of the basket adjustment rod is connected to the shaft sleeve (52) through a screw rod, the lower part of the basket adjustment rod is threadedly connected to a bolt (53), and the end of the bolt is connected to a rotating handle (54).

4. A method for using the multi-stage water pump maintenance platform according to claim 3, characterized in that: The specific steps include: 1) Remove the front vertical plate (34), the front support block (33) on the front jack (31) and the rear support block (43) on the rear jack (41) are both at the lowest height, and the multi-stage water supply pump to be repaired is hoisted onto the grooved support (22) of the multi-stage water supply pump repair platform; 2) Turn the two middle jacks (21) at the same time, so that the trough-shaped support (22) slowly rises and horizontally supports the multi-stage water pump; 3) Remove the coupling, mechanical seal assembly, bearing bushing, balance plate, and bearing seat accessories of the multi-stage water pump; 4) Slightly lift the shaft head of the multi-stage water pump shaft (63) on the water inlet section (61) side, and place a protective copper sheet on the lower part of the shaft hole on the water inlet section side; 5) Insert the shaft sleeve (52) of the basket adjustment assembly (5) into the shaft head on the water inlet side of the pump shaft (63), place the bolt (53) in the U-shaped notch of the front clamp (310), turn the handle (54) to the bottom of the front clamp, turn the basket adjustment rod (51), pull down the shaft head on the water inlet side, and slightly lift the shaft head on the water outlet side; 6) Use the diagonal disassembly method to remove the cylinder bolts of the multi-stage water supply pump and mark each component; 7) Use a copper rod to hammer the inner side of the outlet section footing to separate the outlet section from the middle section (62) and lift it out; 8) Remove the outlet ring and impeller components; 9) Starting from the last stage of the middle section (62), use a copper rod to hammer each stage of the middle section in turn and remove each stage of the middle section; 10) Turn the rear pitch adjustment screw (411) so that the V-shaped rear end support block (43) is located below the shaft head on the water outlet side, and rotate the crank of the rear end jack (41) so that the V-shaped rear end support block (43) rises and contacts the shaft head on the water outlet side; 11) Remove the sleeve (52) on the shaft head on the water inlet side, rotate the front pitch screw (311) so that the V-shaped front end support block (33) is located at the lower part of the shaft head on the water inlet side, rotate the crank of the front end jack (31), and the V-shaped front end support block (33) rises and contacts the shaft head on the water inlet side; 12) Install the front vertical plate (34) on the front box (42), adjust the front pump shaft ejector pin (35) on the front vertical plate (34) and the rear pump shaft ejector pin (45) on the rear vertical plate (44), and adjust the front jack (31) and the rear jack (41) to rise or fall, and push the front pump shaft ejector pin (35) into the correction blind hole of the shaft head end face on the water inlet side, and push the rear pump shaft ejector pin (45) on the rear vertical plate (44) into the correction blind hole of the shaft head end face on the water outlet side, and then tighten the front fastening screw (36) and the rear fastening screw (46) respectively; 13) Place a dial indicator (7) on the multi-stage water supply pump maintenance platform to measure the pump shaft bending of the multi-stage water supply pump and record it; 14) After the impeller and mouth ring components are repaired, the data measurement of the relevant components of the multi-stage water supply pump and the assembly of the multi-stage water supply pump will be carried out in sequence.

5. The method for using the multi-stage water pump maintenance platform according to claim 4, characterized in that: The data measurement of the multi-stage water supply pump related components specifically includes the following steps: 1) Remove the front end plate (34) and the rear end plate (44) at both ends of the multi-stage water supply pump shaft; 2) Insert the shaft sleeve (52) of the basket adjustment assembly (5) into the shaft head on the water inlet side of the pump shaft, place the bolt (53) in the U-shaped notch of the front clamp (310), turn the handle (54) to the bottom of the front clamp, turn the basket adjustment rod (51), and tighten the shaft head on the water inlet side of the pump shaft downward; 3) Turn the crank of the rear end jack (41), and the V-shaped rear end support block (43) drops to the lowest position; 4) Assemble the impeller, the mouth ring, and the machine seal components in sequence, and set a dial indicator on the grooved support (22) to measure the runout and deflection of the above components one by one; 5) Repair or replace substandard parts again until all parts meet the standards.

6. The method for using the multi-stage water pump maintenance platform according to claim 5, characterized in that: The assembly of the multi-stage water supply pump specifically comprises the following steps: 1) Insert the impeller, mouth ring, middle section, sealing ring and water inlet section into the shaft head on the water outlet side of the pump shaft in sequence; 2) Insert the cylinder bolts and pre-tighten them; 3) Remove the shaft sleeve (52) on the shaft head on the water inlet section side, remove the protective copper sheet at the lower part of the shaft hole of the water inlet section, and simultaneously rotate the two middle jacks (21) to lower the grooved support (22) and separate it from the middle section of the multi-stage water supply pump; 4) Select four measuring points at equal distances along the circumference of the middle section, measure the axial length of the middle section starting from each measuring point, and adjust the tightness of the cylinder bolts based on the measured data; 5) Install the mechanical seal assembly, bearings, balance disc, and coupling to complete the assembly of the multi-stage water supply pump.

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