Assembly equipment for subway flood prevention pump

Abstract

The invention relates to the field of water pump production, and particularly discloses subway flood prevention pump assembling equipment which comprises a base, a three-jaw chuck used for limiting a shaft body to be assembled is installed at the upper end of the base, and a telescopic mechanism is arranged above the base; the device comprises a telescopic mechanism and a pressing plate, the telescopic mechanism is used for lifting the pressing plate, a plurality of arc-shaped protrusions are fixedly connected to the lower end of the pressing plate and matched with the wheel face of an impeller to be assembled, two L-shaped connecting plates are symmetrically and fixedly connected to the upper end of the pressing plate, and two first round rods are symmetrically and fixedly connected to the lower ends of the two L-shaped connecting plates. When the equipment is used, low-temperature heating is used in cooperation with press fitting, compared with single press fitting and single heating assembly, on the basis that it is guaranteed that press fitting damage is reduced, the subsequent time for waiting for cooling is effectively shortened, after press fitting, detection after one-time press fitting can be simulated in the high-temperature state, and the detection efficiency is improved. And the high-temperature environment requirement when the pump body works is met.

Description

Technical Field

[0001] This invention relates to the field of water pump manufacturing, and more particularly to an assembly device for a subway flood control pump. Background Technology

[0002] In the subway operation system, flood control pumps are key equipment, bearing the important mission of dealing with flooding and ensuring the safe operation of the subway. Their assembly quality directly affects the reliability and stability of the flood control pumps in complex environments. Traditional subway flood control pump assembly methods mainly employ single press-fitting or single heating assembly. In single press-fitting, due to the lack of effective buffering and auxiliary means, the surfaces of components are easily damaged by excessive pressure when pressing them into their mating positions, resulting in scratches, deformation, and other damage. This damage not only affects the appearance of the flood control pump but also reduces the precision and tightness of the components, thus impacting the overall performance and service life of the pump. While single heating assembly can reduce press-fitting damage to some extent, after assembly, it requires waiting for the components to cool naturally to a suitable temperature, a time-consuming process that significantly reduces assembly efficiency and increases production cycle and cost. Furthermore, in the press-fitting process, existing technologies lack positioning components, making it difficult to ensure the impeller and shaft centerline coincide during press-fitting, affecting subsequent press-fitting. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing an assembly device for a subway flood control pump. This device utilizes a combination of lower-temperature heating and press fitting, which, compared to single press fitting and single heating assembly, effectively reduces the time required for subsequent cooling while minimizing press fitting damage. Furthermore, after press fitting, a post-press fitting test can be simulated under high-temperature conditions, meeting the high-temperature environment requirements of the pump during operation.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: An assembly device for a subway flood control pump includes a base. A three-jaw chuck for limiting the shaft to be assembled is installed on the upper end of the base. A telescopic mechanism is provided above the base. A pressure plate is also included. The telescopic mechanism is used to raise and lower the pressure plate. Multiple arc-shaped protrusions are fixedly connected to the lower end of the pressure plate and mate with the impeller surface to be assembled. Two L-shaped connecting plates are symmetrically fixedly connected to the upper end of the pressure plate. Two first round rods are symmetrically fixedly connected to the lower end of each of the two L-shaped connecting plates. A limit plate is fixedly connected to the lower end of each first round rod. A connecting strip is provided through each pair of mating first round rods. Each connecting bar is elastically connected to its corresponding L-shaped connecting plate via a first spring. Two second round rods are symmetrically fixedly connected to opposite sides of each connecting bar. A connecting block is provided through each second round rod. Each connecting block is elastically connected to its corresponding connecting bar via a second spring. A support seat is fixedly connected between every two corresponding connecting blocks. Both support seats are semi-circular and can be combined to form a circular plate. A semi-circular groove is provided at the upper end of each support seat. A semi-circular opening is provided at the bottom of the inner side of each semi-circular groove. The two semi-circular grooves form a circular groove, and the two semi-circular openings form a circular opening. The plate surface to be fitted with the impeller contacts the bottom of the circular groove.

[0005] Preferably, the telescopic mechanism includes two L-shaped frames symmetrically fixedly connected to the upper end of the base. A mounting plate is fixedly connected between the two L-shaped frames. A hydraulic rod is installed at the upper end of the mounting plate. The telescopic end of the hydraulic rod passes through the mounting plate and is fixedly connected to a lifting plate. A connecting pipe is fixedly connected to the lower end of the lifting plate. The lower end of the connecting pipe is fixedly connected to a pressure plate. A vertical through-hole is provided on the pressure plate for the insertion of the shaft to be assembled later.

[0006] Preferably, a guide sleeve is fixedly connected to the upper end of the lifting plate. The guide sleeve is composed of multiple guide rods and a top U-shaped plate. The multiple guide rods all pass through the mounting plate and are slidably connected.

[0007] Preferably, it also includes a separation mechanism, which enables the two support seats to separate when the telescopic mechanism extends. The separation mechanism includes two guide plates fixedly connected to the base. One side of each guide plate is a guide surface. One side of each support seat is fixedly connected to an abutment column that cooperates with the corresponding guide plate. The end of each abutment column is symmetrically fixedly connected to two L-shaped correction plates. One side of each L-shaped correction plate is in contact with the corresponding guide plate and is slidably connected.

[0008] Preferably, it further includes an anti-reset mechanism, which includes two piston cylinders, which are respectively fixed to opposite sides of two connecting bars. A first piston block is slidably connected inside each of the two piston cylinders. A piston rod is fixedly connected to the opposite side of each of the two first piston blocks. The opposite ends of the two piston rods pass through the corresponding connecting bars and are fixedly connected to the corresponding support seats.

[0009] Preferably, the spaces on opposite sides of the two piston cylinders are connected to the outside through a first one-way pipe and a second one-way pipe. The first one-way pipe is a pipe extending backward along the piston cylinder. Two baffles are symmetrically fixedly connected to the upper end of the base, and the front side of each baffle is engaged with the rear side of the corresponding first one-way pipe.

[0010] Preferably, both the first one-way pipe and the second one-way pipe are equipped with one-way valves. The flow direction of the one-way valve inside the first one-way pipe is one-way from the outside to the piston cylinder, and the flow direction of the one-way valve inside the second one-way pipe is one-way from the piston cylinder to the outside.

[0011] Preferably, the system further includes a cooling mechanism, which comprises two air accumulators, each fixedly connected to a corresponding piston cylinder. Each air accumulator contains a slidable second piston block. The opposite sides of the two piston blocks are elastically connected to the inner wall of the corresponding air accumulator via a third spring. The other ends of the two second one-way pipes are connected to the side of the corresponding air accumulator away from the support. Each support has an arc-shaped cavity inside, and multiple exhaust holes are provided on the inner side of each arc-shaped cavity. The opposing spaces of the two air accumulators are connected to the corresponding arc-shaped cavity via release pipes.

[0012] Preferably, each of the two air accumulators has a through port on its opposite sidewall, and a normally open solenoid valve is installed inside the release pipe, which opens and closes synchronously with the hydraulic rod.

[0013] Preferably, it further includes a support detection mechanism, which includes two support bars. Rectangular grooves are provided on the opposite sides of the two support seats. Every two rectangular grooves form a rectangular cavity. A support bar is slidably connected in each rectangular cavity. One side of each support bar is elastically connected to the interior of the corresponding rectangular cavity through a fourth spring. An inclined surface is provided on the side of each support bar away from the corresponding fourth spring.

[0014] Compared with the prior art, the beneficial effects of this invention are as follows: 1. This invention preheats the impeller to be assembled and uses a support base, a first spring, and a circular groove structure to pre-position the impeller, making it horizontal and aligning its center with the circular opening. The central axis of the circular opening coincides with the central axis of the fixed shaft, which facilitates subsequent assembly operations. While ensuring reduced pressure-fitting damage, the subsequent waiting time for cooling is effectively reduced.

[0015] 2. The arc-shaped protrusion at the lower end of the pressure plate matches the impeller surface, expanding the pressure contact range, making the pressure uniform, and avoiding localized deformation.

[0016] 3. During the press-fitting process, the piston rod and other structures are used to press the gas into the gas storage cylinder when the support seat separates. After the press-fitting is completed, the gas is released into the arc-shaped cavity inside the support seat through the release pipe and discharged from the exhaust port, which cools the workpiece to about 50°C. The cooling temperature at this stage is low, which does not generate excessive stress and does not affect the quality of the workpiece. At the same time, it greatly reduces the time to wait for the subsequent cooling to room temperature, which solves the problem of long natural cooling time after single heating assembly, which reduces assembly efficiency, increases production cycle and cost.

[0017] 4. During the return phase after pressing, the first one-way pipe is blocked by the baffle plate and cannot be replenished with gas, so the first piston block cannot return, which in turn prevents the support seat from returning. During the return process, the two support seats remain separated and do not interfere with the impeller after pressing, making it convenient to remove the assembled impeller and shaft. When the first one-way pipe no longer contacts the baffle plate and is replenished with gas at the end of the return, all components are reset, making it convenient for the next operation.

[0018] 5. When the two support seats are not separated, the support bar connects the two support seats. After the impeller to be assembled is placed in, the support stability is improved. After the press fitting is completed, the support seat is moved up so that the edge of the impeller contacts the inclined surface of the support bar. Controlling the upward movement speed can simulate the stability of the impeller assembly with the shaft under high temperature environment and detect the tightness of the connection between the two under the extreme conditions of high impeller temperature and relatively low shaft temperature. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the assembly equipment for a subway flood control pump proposed in this invention; Figure 2 for Figure 1 Diagram showing the fit between the two support seats; Figure 3 for Figure 2 Enlarged view of the left side; Figure 4 for Figure 1 A top-down view; Figure 5 for Figure 4 AA-direction cross-section diagram; Figure 6 for Figure 5 Enlarged view of point B; Figure 7 for Figure 5 Enlarged view of point C; Figure 8 for Figure 1 A schematic diagram of the structure after removing the two support bases; Figure 9 for Figure 2 Front view; Figure 10 for Figure 9 DD-direction cross-sectional view of the two supports; Figure 11 for Figure 10 Enlarged view of point E.

[0020] In the diagram: 1. Base, 2. Three-jaw chuck, 3. L-shaped frame, 4. Mounting plate, 5. Hydraulic rod, 6. Lifting plate, 7. Guide sleeve, 8. Connecting pipe, 9. Pressure plate, 10. Guide plate, 11. Cover plate, 12. Support seat, 13. L-shaped connecting plate, 14. Connecting strip, 15. Semicircular groove, 16. Piston cylinder, 17. Exhaust hole, 18. First round rod, 19. First spring, 20. Limiting plate, 21. Piston rod, 22. Air accumulator, 23. Release pipe, 24. First one-way pipe, 25. Abutment column, 26. L-shaped correction plate, 27. Second one-way pipe, 28. First piston block, 29. Second piston block, 30. Third spring, 31. Conductor port, 32. Arc-shaped protrusion, 33. Semicircular opening, 34. Rectangular groove, 35. Fourth spring, 36. Support strip, 37. Inclined surface, 38. Second round rod, 39. Second spring, 40. Connecting block, 41. Arc-shaped cavity. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0022] Reference Figures 1-11 An assembly device for a subway flood control pump includes a base 1. A three-jaw chuck 2 for limiting the shaft to be assembled is installed on the upper end of the base 1. In the initial stage of assembly, the shaft to be assembled can be fixed by the three-jaw chuck 2. The positioning property of the three-jaw chuck 2 itself can ensure that the central axis of the shaft to be assembled coincides with the central axis of the three-jaw chuck 2 after positioning is completed. A telescopic mechanism is provided above the base 1. The telescopic mechanism includes two L-shaped frames 3 symmetrically fixedly connected to the upper end of the base 1. A mounting plate 4 is fixedly connected between the two L-shaped frames 3. A hydraulic rod 5 is installed on the upper end of the mounting plate 4. The hydraulic rod 5 can be a DYTP series electric hydraulic push rod. The telescopic end of the hydraulic rod 5 passes through the mounting plate 4 and is fixedly connected to a lifting plate 6. A connecting pipe 8 is fixedly connected to the lower end of the lifting plate 6.

[0023] The upper end of the lifting plate 6 is fixedly connected to a guide sleeve 7, which consists of multiple guide rods and a top U-shaped plate. The multiple guide rods all pass through the mounting plate 4 and are slidably connected. The structure of the guide sleeve 7 can ensure the stability during the pressing process, thereby improving the actual pressing effect.

[0024] The device also includes a pressure plate 9, with the lower end of the connecting pipe 8 fixedly connected to the pressure plate 9. The pressure plate 9 has a vertical through-hole for the connecting pipe 8 to be inserted into the shaft to be assembled. The lower end of the pressure plate 9 is fixedly connected to multiple arc-shaped protrusions 32, which mate with the impeller surface to be assembled (the impeller to be assembled is a single-plate impeller, which consists of a wheel surface and a plate surface). During the subsequent pressing operation, the use of multiple arc-shaped protrusions 32 can achieve a larger contact range for pressurization, achieve pressure uniformity, and avoid the occurrence of local deformation due to excessive pressure concentration. Two L-shaped connecting plates 13 are symmetrically fixedly connected to the upper end of the pressure plate 9. Two first round rods 18 are symmetrically fixedly connected to the lower ends of each L-shaped connecting plate 13. A limit plate 20 is fixedly connected to the lower end of each first round rod 18. A connecting strip 14 is provided through each pair of mating first round rods 18. Each connecting strip 14 is elastically connected to the corresponding L-shaped connecting plate 13 via a first spring 19. Furthermore, the first springs 19 are springs with a large stiffness coefficient. The support provided by multiple first springs 19 ensures that the impeller to be pressed and heated will not be compressed excessively after placement. The height of the arc-shaped protrusion 32 is the same as the height of the impeller's wheel strip. Initially, the arc-shaped protrusion 32 is at a distance from the bottom of the semi-circular groove 15. The distance is less than the thickness of the impeller plate to ensure that after the impeller is installed, its upper and lower sides are in contact with the semi-circular groove 15 or the pressure plate 9 (arc protrusion 32). Two second round rods 38 are symmetrically fixedly connected to the opposite sides of the two connecting bars 14. A connecting block 40 is provided through each second round rod 38. Each connecting block 40 is elastically connected to the corresponding connecting bar 14 through a second spring 39. A support seat 12 is fixedly connected between every two corresponding connecting blocks 40. The two support seats 12 are semi-circular and can be combined to form a circular plate. A semi-circular groove 15 is opened at the upper end of each support seat 12. A semi-circular opening 33 is opened at the bottom of the inner side of each semi-circular groove 15. The two semi-circular grooves 15 form a circular groove, and the two semi-circular openings 33 form a circular opening. The plate surface of the impeller to be installed is in contact with the bottom of the circular groove. The placement process of the impeller to be assembled is as follows: First, the impeller to be assembled is heated to about 80°C. Then, the user moves the two support seats 12 downwards against the elastic action of multiple first springs 19, exposing the circular groove. The impeller to be assembled is then placed into the circular groove. At this time, due to the positioning effect of the circular groove, the impeller to be assembled is horizontal, and the center of the impeller to be assembled is aligned with the circular opening. The central axis of the circular opening coincides with the central axis of the shaft body to be assembled after it has been fixed, thus achieving pre-positioning and facilitating subsequent assembly operations.

[0025] The system also includes a separation mechanism that enables the two support seats 12 to separate when the telescopic mechanism is extended. The separation mechanism includes two guide plates 10 fixedly connected to the base 1. One side of each guide plate 10 is a guide surface. One side of each support seat 12 is fixedly connected to an abutment post 25 that cooperates with the corresponding guide plate 10. The end of each abutment post 25 is symmetrically fixedly connected to two L-shaped correction plates 26. One side of each L-shaped correction plate 26 is in contact with the corresponding guide plate 10 and is slidably connected. like Figure 1 As shown in the diagram, the two guide plates 10 are staggered, with the left support 12 cooperating with the right guide plate 10, and the right support 12 cooperating with the left guide plate 10. The guide surface on one side of the guide plate 10 is composed of a vertical plane and an inclined plane. During the press-fitting process, initially, the impeller to be assembled does not contact the shaft. At this time, the abutment column 25 only slides on the vertical plane, so the two support seats 12 do not separate. When the impeller contacts the shaft, the abutment column 25 just contacts the corresponding inclined plane. With continued pressure, under the action of the inclined plane, the two support seats 12 will move in opposite directions, compressing the corresponding second spring 39, thereby achieving separation. Furthermore, after the overall press-fitting is completed, the two support seats 12 are completely separated, and the distance between them is greater than the diameter of the impeller. In this way, during the subsequent return process, the impeller will not interfere with the support seat 12.

[0026] The system also includes an anti-reset mechanism, which comprises two piston cylinders 16. The two piston cylinders 16 are fixed to opposite sides of two connecting bars 14. Each piston cylinder 16 has a first piston block 28 slidably connected inside it. Piston rods 21 are fixedly connected to opposite sides of the two first piston blocks 28. The opposite ends of the two piston rods 21 pass through the corresponding connecting bars 14 and are fixedly connected to the corresponding support seats 12. The spaces on opposite sides of the two piston cylinders 16 are connected to the outside through a first one-way pipe 24 and a second one-way pipe 27. The tube 24 is a tube extending backward along the piston cylinder 16, and its rear end is provided with an annular sealing ring to ensure its contact sealing with the baffle plate 11. Two baffle plates 11 are symmetrically fixedly connected to the upper end of the base 1. The front side of the two baffle plates 11 is matched with the rear side of the corresponding first one-way tube 24. One-way valves are installed inside the first one-way tube 24 and the second one-way tube 27. The flow direction of the one-way valve inside the first one-way tube 24 is one-way entry into the piston cylinder 16 from the outside, and the flow direction of the one-way valve inside the second one-way tube 27 is one-way discharge from the piston cylinder 16 to the outside. During the press-fitting operation, the separation of the support seat 12 is achieved by the piston rod 21, which causes the two first piston blocks 28 to move in opposite directions. Gas is then forced into the corresponding gas storage cylinder 22 through the one-way valve in the second one-way tube 27, completing the return phase of the press-fitting. Under the elastic action of the second spring 39, the two support seats 12, piston rod 21, and first piston blocks 28 tend to return. However, because the rear side of the corresponding first one-way tube 24 is blocked and sealed by the baffle plate 11 during the upward movement, gas cannot be replenished. As a result, the first piston block 28 cannot return during this process, and ultimately the support seat 12 cannot return. Therefore, during the return process, the two support seats 12 remain in a separated state and will not interfere with the press-fitted impeller, facilitating the subsequent removal of the assembled impeller and shaft. When the return phase after press-fitting is completed, the first one-way tube 24 no longer contacts the baffle plate 11. Therefore, after gas replenishment, the support seat 12, piston rod 21, and first piston blocks 28 are all reset, facilitating the next operation.

[0027] The system also includes a cooling mechanism, which comprises two air accumulators 22, each fixedly connected to a corresponding piston cylinder 16. Each air accumulator 22 contains a slidable second piston block 29. The opposite sides of the two second piston blocks 29 are elastically connected to the inner wall of the corresponding air accumulator 22 via a third spring 30. The other ends of the two second one-way pipes 27 are connected to the side of the corresponding air accumulator 22 away from the support base 12. Each support base 12 has an arc-shaped cavity 41 inside. The inner side of each arc-shaped cavity 41 has multiple exhaust holes 17. The opposite sides of the two air accumulators 22 are connected to the corresponding arc-shaped cavity 41 via a release pipe 23. The opposite side walls of the two air accumulators 22 have a guide port 31. The release pipe 23 is equipped with a normally open solenoid valve, which opens and closes synchronously with the hydraulic rod 5. During the press-fitting process, gas is replenished into the accumulator 22. Since the normally open solenoid valve and the hydraulic rod 5 open and close synchronously, the release pipe 23 is sealed during press-fitting, preventing gas from being released. This causes the second piston block 29 to move closer to the support seat 12 and compress the third spring 30. After press-fitting is completed, the normally open solenoid valve is de-energized, so this part of the gas is released. Furthermore, the diameter of the release pipe 23 can be set to a smaller size to control the gas release speed. The released gas is finally discharged at the exhaust port 17 of the arc-shaped cavity 41, cooling the press-fitted workpiece to about 50°C. Complete cooling is not required. Compared with the existing hot assembly process, the time required for the workpiece to cool down to room temperature is significantly reduced using this method.

[0028] This also includes a support detection mechanism, which comprises two support bars 36. Rectangular grooves 34 are formed on the opposite sides of the two support seats 12, with each pair of rectangular grooves 34 forming a rectangular cavity. A support bar 36 is slidably connected within each rectangular cavity. One side of each support bar 36 is elastically connected to the corresponding rectangular cavity via a fourth spring 35. An inclined surface 37 is provided on the side of each support bar 36 away from the corresponding fourth spring 35. Figure 11 As shown, one end of the fourth spring 35 of the two support bars 36 is located in the rectangular groove 34 on the left and the other end is located in the rectangular groove 34 on the right, so that the force is more even during the testing operation. By using the support bar 36, the two support seats 12 can be connected before they are separated. When the impeller to be assembled is placed in, the two support seats 12 will be evenly stressed, improving the support stability. After separation, i.e. after pressing is completed, although the distance between the two support seats 12 is greater than the diameter of the impeller, the two support bars 36 are in a state of protruding from the support seats 12. Their upward movement will interfere with the impeller. The edge of the impeller will contact the inclined surface 37 of the corresponding support bar 36. Furthermore, the upward movement speed can be controlled to make the upward movement process faster. In this way, the impeller will collide with the inclined surface 37 and eventually push the inclined surface 37 to detach from the impeller. By changing the inclination angle of the inclined surface 37 and the upward movement speed, the magnitude of the impact force can be controlled. This impact can simulate the stability of the impeller assembly with the shaft under high temperature conditions. It is important to note that the impeller being at a high temperature while the shaft is at a relatively low temperature represents an extreme situation under current usage scenarios. If, under this condition (i.e., the impeller experiences slight thermal expansion while the shaft remains almost unchanged), the connection between the two remains tight, then the assembled pump will possess extremely strong stability. This extreme situation typically occurs during the continuous use of flood control pumps, where the floodwater contains numerous fine impurities (that cannot be filtered by a filter). These impurities rub against the impeller, causing it to heat up, while the shaft experiences less friction and a relatively lower temperature. It may also occur when the inlet of the flood control pump becomes blocked, leading to a similar situation where the impeller becomes stagnant and heats up.

[0029] In this invention, the impeller to be assembled is first heated to approximately 80°C. The user then moves the two support seats 12 downwards against the elastic force of multiple first springs 19. During this process, the first springs 19 are compressed. Because the first springs 19 are springs with a large stiffness coefficient, they do not compress significantly after the heated impeller is placed in, exposing the circular groove. The impeller to be assembled is then placed into the circular groove. At this point, due to the positioning effect of the circular groove, the impeller to be assembled is horizontal, and the center of the impeller is aligned with the circular opening. The central axis of the circular opening coincides with the central axis of the shaft body to be assembled after it has been fixed, achieving pre-positioning and facilitating subsequent assembly operations. The hydraulic rod 5 at the upper end of the mounting plate 4 is activated, and its telescopic end drives the lifting plate 6 to move downward. The guide sleeve 7 on the lifting plate 6 ensures the stability of the pressing process. The connecting pipe 8 at the lower end of the lifting plate 6 drives the pressure plate 9 to move downward. The multiple arc-shaped protrusions 32 at the lower end of the pressure plate 9 cooperate with the wheel surface of the impeller to be assembled, which can achieve a larger pressure contact range, make the pressure uniform, and avoid local deformation due to stress. In the initial stage of pressing, the impeller to be assembled is not in contact with the shaft. At this time, the abutment column 25 slides on the vertical plane of the guide surface of the guide plate 10, and the two support seats 12 will not separate. When the impeller contacts the shaft, the abutment column 25 just contacts the corresponding inclined plane. As the pressure continues to be applied, under the action of the inclined plane, the two support seats 12 move in opposite directions, and at the same time compress the corresponding second spring 39 to achieve separation. When the support seats 12 separate, the piston rod 21 makes the two first piston blocks 28 move in opposite directions, and the gas is pressed into the corresponding gas storage cylinder 22 through the one-way valve in the second one-way tube 27. After the press installation is completed, the two support seats 12 separate to the farthest position. Furthermore, during the pressing process, gas is replenished into the accumulator 22. Since the normally open solenoid valve and the hydraulic rod 5 open and close synchronously, the release pipe 23 is sealed during pressing, preventing gas from being released. The second piston block 29 moves close to the support seat 12 and compresses the third spring 30. After pressing is completed, the normally open solenoid valve is de-energized, and the gas in the accumulator 22 is released through the release pipe 23 into the arc-shaped cavity 41 inside the support seat 12, and finally discharged from the exhaust port 17, cooling the pressed workpiece to approximately 50°C. Due to the relatively low cooling temperature at this stage, excessive stress is not generated, thus not affecting the quality of the workpiece, and significantly reducing the subsequent waiting time for it to cool to room temperature. During the return phase after pressing, under the elastic action of the second spring 39, the two support seats 12, piston rod 21, and first piston block 28 tend to return. However, because the rear side of the corresponding first one-way pipe 24 is blocked and sealed by the baffle plate 11 during the upward movement, gas cannot be replenished, and the first piston block 28 cannot return, thus preventing the support seats 12 from returning. During the return process, the two support seats 12 remain separated and will not interfere with the press-fitted impeller, facilitating the subsequent removal of the assembled impeller and shaft. When the return phase after pressing is completed, the first one-way pipe 24 no longer contacts the baffle plate 11. After gas replenishment, the support seats 12, piston rod 21, and first piston block 28 are finally reset, facilitating the next operation. It is important to note that when the two support seats 12 are not separated, the two support bars 36 connect them. After the impeller to be assembled is placed in the mounting, the two support seats 12 are evenly stressed, improving support stability. After press-fitting, the distance between the two support seats 12 is greater than the diameter of the impeller, but the two support bars 36 are partially protruding from the support seats 12. When the support seats 12 are moved upward, the edge of the impeller will contact the inclined surface 37 of the corresponding support bar 36. By controlling the upward movement speed to be relatively fast, the impeller will collide with the inclined surface 37, eventually pushing the inclined surface 37 away from the impeller. This impact can simulate the stability of the impeller assembly with the shaft under high temperature conditions, and test the tightness of the connection between the two under extreme conditions of high impeller temperature and relatively low shaft temperature.

[0030] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An assembly device for a subway flood control pump, characterized in that, include: The base (1) is equipped with a three-jaw chuck (2) for limiting the shaft to be assembled at its upper end, and a telescopic mechanism is provided above the base (1). The pressure plate (9) is used for lifting and lowering by the telescopic mechanism. Multiple arc-shaped protrusions (32) are fixedly connected to the lower end of the pressure plate (9) and mate with the impeller surface to be assembled. Two L-shaped connecting plates (13) are symmetrically fixedly connected to the upper end of the pressure plate (9). Two first round rods (18) are symmetrically fixedly connected to the lower ends of the two L-shaped connecting plates (13). A limit plate (20) is fixedly connected to the lower end of each first round rod (18). A connecting strip (14) is provided through each pair of mating first round rods (18). Each connecting strip (14) is elastically connected to the corresponding L-shaped connecting plate (13) via a first spring (19). The two connecting strips (14)... Two second round rods (38) are symmetrically fixedly connected on opposite sides. Each second round rod (38) is provided with a connecting block (40). Each connecting block (40) is elastically connected to the corresponding connecting strip (14) through a second spring (39). A support seat (12) is fixedly connected between each pair of corresponding connecting blocks (40). Both support seats (12) are semi-circular and can be combined to form a circular plate. A semi-circular groove (15) is opened at the upper end of each support seat (12). A semi-circular opening (33) is opened at the bottom of the inner half of each semi-circular groove (15). The two semi-circular grooves (15) form a circular groove, and the two semi-circular openings (33) form a circular opening. The plate surface to be assembled with the impeller contacts the bottom of the circular groove.

2. The assembly equipment for a subway flood control pump according to claim 1, characterized in that, The telescopic mechanism includes two L-shaped frames (3) symmetrically fixedly connected to the upper end of the base (1). A mounting plate (4) is fixedly connected between the two L-shaped frames (3). A hydraulic rod (5) is installed on the upper end of the mounting plate (4). The telescopic end of the hydraulic rod (5) passes through the mounting plate (4) and is fixedly connected to a lifting plate (6). A connecting pipe (8) is fixedly connected to the lower end of the lifting plate (6). The lower end of the connecting pipe (8) is fixedly connected to a pressure plate (9). A vertical through-hole is opened on the pressure plate (9) for the insertion of the shaft body to be assembled later.

3. The assembly equipment for a subway flood control pump according to claim 2, characterized in that, The upper end of the lifting plate (6) is fixedly connected to a guide sleeve (7), which is composed of multiple guide rods and a top U-shaped plate. The multiple guide rods all pass through the mounting plate (4) and are slidably connected.

4. The assembly equipment for a subway flood control pump according to claim 2, characterized in that, It also includes a separation mechanism, which enables the two support seats (12) to separate when the telescopic mechanism is extended. The separation mechanism includes two guide plates (10) fixedly connected to the base (1). One side of each guide plate (10) is a guide surface. One side of each support seat (12) is fixedly connected to an abutment column (25) that cooperates with the corresponding guide plate (10). The end of each abutment column (25) is symmetrically fixedly connected to two L-shaped correction plates (26). One side of each L-shaped correction plate (26) is in contact with the corresponding guide plate (10) and is slidably connected.

5. The assembly equipment for a subway flood control pump according to claim 2, characterized in that, It also includes an anti-reset mechanism, which includes two piston cylinders (16), the two piston cylinders (16) are respectively fixed on opposite sides of two connecting bars (14), and a first piston block (28) is slidably connected inside the two piston cylinders (16). A piston rod (21) is fixedly connected to the opposite side of the two first piston blocks (28). The opposite ends of the two piston rods (21) pass through the corresponding connecting bars (14) and are fixedly connected to the corresponding support base (12).

6. The assembly equipment for a subway flood control pump according to claim 5, characterized in that, The opposing spaces of the two piston cylinders (16) are connected to the outside through the first one-way pipe (24) and the second one-way pipe (27). The first one-way pipe (24) is a pipe extending backward along the piston cylinder (16). Two baffles (11) are symmetrically fixedly connected to the upper end of the base (1). The front side of the two baffles (11) is engaged with the rear side of the corresponding first one-way pipe (24).

7. The assembly equipment for a subway flood control pump according to claim 6, characterized in that, Both the first one-way pipe (24) and the second one-way pipe (27) are equipped with one-way valves. The flow direction of the one-way valve inside the first one-way pipe (24) is one-way from the outside to the piston cylinder (16), and the flow direction of the one-way valve inside the second one-way pipe (27) is one-way from the piston cylinder (16) to the outside.

8. The assembly equipment for a subway flood control pump according to claim 7, characterized in that, It also includes a cooling mechanism, which includes two air storage cylinders (22). Both air storage cylinders (22) are fixedly connected to the corresponding piston cylinders (16). Each of the two air storage cylinders (22) is provided with a sliding second piston block (29). The opposite sides of the two second piston blocks (29) are elastically connected to the inner wall of the corresponding air storage cylinder (22) through a third spring (30). The other end of each of the two second one-way pipes (27) is connected to the side of the corresponding air storage cylinder (22) away from the support seat (12). Each of the two support seats (12) has an arc-shaped cavity (41) inside. Each of the two arc-shaped cavities (41) has multiple exhaust holes (17) on the inner side of each arc-shaped cavity (41). The opposite side spaces of the two air storage cylinders (22) are connected to the corresponding arc-shaped cavity (41) through a release pipe (23).

9. The assembly equipment for a subway flood control pump according to claim 8, characterized in that, Both of the two air accumulators (22) have a guide port (31) on their opposite sidewalls. The release pipe (23) is equipped with a normally open solenoid valve, which opens and closes synchronously with the hydraulic rod (5).

10. The assembly equipment for a subway flood control pump according to claim 6, characterized in that, It also includes a support detection mechanism, which includes two support bars (36). Rectangular grooves (34) are provided on the opposite sides of the two support seats (12). Each pair of rectangular grooves (34) forms a rectangular cavity. A support bar (36) is slidably connected in each rectangular cavity. One side of each support bar (36) is elastically connected to the inside of the corresponding rectangular cavity through a fourth spring (35). An inclined surface (37) is provided on the side of each support bar (36) away from the corresponding fourth spring (35).

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