Water pump rotor bearing press fitting machine

Abstract

The application discloses a water pump rotor bearing press-fitting machine and relates to the field of water pump processing.The water pump rotor bearing press-fitting machine comprises a device main body, a processing area arranged on the upper end of the device main body, a limiting mechanism, a placing seat, an arc-shaped upper end of the placing seat, a rotor main body placed on the placing seat, a first air cylinder arranged on the upper end of the rear side of the placing seat, a clamping plate fixedly connected to the telescopic end of the first air cylinder, a double-end press-fitting mechanism, two connecting seats, one of which is a fixed seat and the other of which is a moving seat, and a telescopic assembly installed on one side of the processing area and used for moving the corresponding connecting seat leftward and rightward.The press-fitting machine can simultaneously press-fit the bearings at the two ends of the water pump rotor during actual use, and the continuous feeding device is used, so that the overall processing efficiency is greatly improved, and the press-fitting operation is facilitated.

Description

Technical Field

[0001] This invention relates to the field of water pump processing, and more particularly to a water pump rotor bearing press-fitting machine. Background Technology

[0002] In the field of water pump manufacturing, the press-fitting of water pump rotor bearings is one of the key processes, and its press-fitting quality directly affects the operational stability, service life and performance of the water pump.

[0003] Traditional water pump rotor bearing press-fitting process usually adopts single-end press-fitting method, that is, the bearings at both ends of the rotor are press-fitted independently in sequence. Single-end operation requires repeated adjustment of equipment parameters, and the processing cycle is long, which is difficult to meet the efficiency requirements of large-scale production.

[0004] In addition, bearings and shafts usually use an interference fit. During the press-fit operation, since a large pressure is generally used to overcome the press-fit resistance, that is, the inner diameter of the bearing is slightly smaller than the diameter of the shaft or the diameter of the bearing housing. When the bearing size is large or the interference is high, direct press-fit requires the application of a large external force. The large friction will increase the overall load of the device, reduce the service life of the device, and easily damage the connection. Therefore, how to solve the above problems needs to be considered. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and propose a water pump rotor bearing press-fitting machine. In actual use, this press-fitting machine can simultaneously press-fit the bearings at both ends of the water pump rotor. Combined with a continuous feeding device, it greatly improves the overall processing efficiency.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A water pump rotor bearing press-fitting machine includes a main body and a processing area set at the upper end of the main body. It also includes a limiting mechanism, which includes a placement seat with an arc-shaped upper end for placing the rotor body. A first cylinder is mounted on the upper rear side of the placement seat, and a clamping plate is fixedly connected to the telescopic end of the first cylinder. A double-end press-fitting mechanism includes two connecting seats, one of which is a fixed seat and the other is a movable seat. A telescopic component for moving the corresponding connecting seat left and right is installed on one side of the processing area. A connecting column is horizontally inserted and fixed to each of the two connecting seats. A pressing groove is opened on the opposite side of each of the two connecting columns, and a through hole is opened on the opposite sidewall of each pressing groove. One side of the placement seat is elastically connected to the corresponding connecting seat via a fourth spring. A guide rod is fixedly connected to the side of the placement seat near the telescopic component, and the other end of the guide rod passes through the corresponding placement seat and is slidably connected.

[0008] Preferably, two guide strips are symmetrically fixedly connected between the inner walls of the left and right sides of the processing area. The connecting seat on the side away from the telescopic component is fixedly connected to the two guide strips, and the placement seat and another connecting seat are both guidedly connected to the two guide strips.

[0009] Preferably, the device further includes a feeding mechanism, which includes two temporary storage bars arranged symmetrically and fixedly connected to the upper end of the corresponding connecting seat. Temporary storage grooves are provided on opposite sides of the two temporary storage bars. A feeding cylinder communicating with the temporary storage groove is fixedly connected to the upper end of each of the two temporary storage bars. A third cylinder is installed on the opposite sides of each of the two temporary storage bars. The telescopic end of each third cylinder extends to the corresponding temporary storage groove. A sliding abutment bar is fixedly connected to the telescopic end of each third cylinder. A guide plate is fixedly connected to opposite sides of the two temporary storage bars. A notch groove that mates with the guide plate is provided on the inner top of each of the two pressing slots.

[0010] Preferably, an extension bar is fixedly connected to each of the two temporary storage bars on opposite sides, a second cylinder is installed at the upper end of each of the two extension bars, the telescopic ends of the two second cylinders pass through the corresponding extension bars, and a baffle plate is fixedly connected to the telescopic ends of the two second cylinders.

[0011] Preferably, the system further includes a heating and lubrication mechanism, which includes two connecting cylinders fixedly connected to the lower ends of the corresponding temporary storage bars. Each connecting cylinder is connected to the corresponding temporary storage groove. Each connecting cylinder is provided with a magnetic sliding plate that can slide up and down. The upper end of each magnetic sliding plate is fixedly connected to a temperature-conducting column. Each temperature-conducting column is embedded with an electric heating component. An electromagnet is installed at the bottom of the inner side of each connecting cylinder. When each electromagnet is energized, it attracts the adjacent surfaces of the corresponding magnetic sliding plate with opposite polarities. The lower end of each magnetic sliding plate is elastically connected to the bottom of the inner side of the corresponding connecting cylinder through a first spring.

[0012] Preferably, each of the connecting cylinders has a columnar groove at its inner top, and each columnar groove has a slidable piston block. Each piston block is fixedly connected to a corresponding magnetic sliding plate via a fixing rod. Each columnar groove has a first one-way tube at its inner bottom. Each temperature-conducting column, its corresponding fixing rod, and the piston block all have a one-way channel. Each temperature-conducting column has an annular groove at its upper end. Each temperature-conducting column has a rubber ring installed at its outer edge. Each one-way channel is connected to the corresponding annular groove via two connecting holes.

[0013] Preferably, each of the one-way channels and the first one-way pipe is equipped with a one-way valve. The flow direction of the one-way valve inside the one-way channel is from bottom to top, and the flow direction of the one-way valve inside the first one-way pipe is to enter the bottom space of the columnar groove from the outside.

[0014] Preferably, the system further includes a cooling mechanism, which includes an L-shaped plate fixedly connected to a connecting seat on the side away from the telescopic component. A piston cylinder is fixedly connected to one vertical part of the L-shaped plate, and a first piston plate that can slide left and right is disposed inside the piston cylinder. A vertical plate is fixedly connected to the lower end of another connecting seat, and one side of the vertical plate is fixedly connected to the first piston plate via a sliding rod. A gas storage cylinder is fixedly connected to one vertical part of the L-shaped plate, and a second piston plate that can slide left and right is disposed inside the gas storage cylinder. One side of the second piston plate is elastically connected to the corresponding side wall of the gas storage cylinder via a third spring. The space on the side of the gas storage cylinder away from the piston cylinder is connected to the outside through a pressure stabilizing hole. The space on the side of the piston cylinder close to the gas storage cylinder is connected to the outside through a first one-way port. The space on the side of the piston cylinder close to the gas storage cylinder is connected to the space on the side of the gas storage cylinder close to the piston cylinder via a second one-way port.

[0015] Preferably, the placement base is equipped with an installation plate, and two second springs are fixedly connected to both sides of the installation plate. The other ends of the two second springs are fixedly connected to jet tubes. Flat jet nozzles are opened on the front sidewalls of the two jet tubes. Rectangular guide plates are fixedly connected to the opposite sides of the two jet tubes. The two rectangular guide plates pass through the corresponding installation plates and are slidably connected. L-shaped abutment plates are fixedly connected to the opposite sides of the two connecting bases. The two jet tubes are connected through a first U-shaped tube. The first U-shaped tube is connected to the space near the piston cylinder of the gas accumulation cylinder through a second one-way tube. The diameter of the second one-way tube is one-third of the diameter of the second one-way opening. An annular cavity is provided inside the two connecting columns. Multiple negative pressure holes are opened on the opposite sidewalls of the two annular cavities. The two annular cavities are connected through the second U-shaped tube. The second U-shaped tube and the second one-way tube are connected through a connecting pipe. A third one-way tube is connected at the second one-way opening.

[0016] Preferably, one-way valves are installed inside the first one-way port, the second one-way port, the second one-way tube, the third one-way tube, and the connecting pipe. The one-way valve inside the first one-way port allows the outside to enter the space near the gas accumulator cylinder from the outside. The one-way valve inside the second one-way port allows the outside to enter the space near the piston cylinder from the piston cylinder. The one-way valve inside the third one-way tube allows the outside to enter the second one-way port from the outside. The one-way valve inside the second one-way tube allows the gas accumulator cylinder to enter the first U-shaped tube from the inside. The one-way valve inside the connecting pipe allows the outside to enter the second one-way tube from the second U-shaped tube.

[0017] Compared with the prior art, the beneficial effects of this invention are as follows:

[0018] 1. The double-end pressing mechanism adopts a design where the left and right connecting seats move relative to each other. Combined with the through holes, it can completely press the bearing into both ends of the rotor in one operation, achieving a complete pressing operation. Only a drive source is needed, simplifying the operation process, improving pressing efficiency, and reducing equipment costs.

[0019] 2. The feeding mechanism utilizes a structure including a temporary storage bar, a feeding cylinder, a stop bar, and a guide plate to achieve automatic feeding of bearings. The baffle plate prevents bearings from being ejected from their mounting slots due to inertia, ensuring accurate and stable feeding, reducing manual intervention, and improving the degree of production automation.

[0020] 3. The heating and lubrication mechanism heats the inner ring of the bearing before press fitting to cause thermal expansion, while simultaneously applying lubricating oil evenly to the inner ring to form a uniform oil film. This effectively reduces press fitting resistance, minimizes damage to the bearing and rotor, and improves press fitting quality and component lifespan.

[0021] 4. During the pressing process, the cooling mechanism uses a jet nozzle and airflow guide to ensure that the cold airflow acts evenly on the thin shaft body, avoiding affecting the bearing temperature and ensuring smooth pressing. At the same time, it achieves uniform cooling and shrinkage of the thin shaft body, which facilitates pressing.

[0022] 5. Utilizing the negative pressure generated by high-speed airflow, negative pressure is formed from the negative pressure hole to limit the bearing, ensuring the stability of the bearing before press-fitting, ensuring the stability and accuracy of subsequent press-fitting operations, and improving the success rate of press-fitting.

[0023] 6. During the reset phase after pressing, residual cold air is released, and the pressing area is cooled down quickly again to prevent the connection tightness from being affected by excessive temperature. This allows for direct follow-up operations and improves production efficiency. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of Embodiment 1 proposed in this invention;

[0025] Figure 2 A schematic diagram showing the coordination between the limit mechanism and the double-end pressing mechanism;

[0026] Figure 3 This is a schematic diagram of the structure of one of the connectors;

[0027] Figure 4 for Figure 3 Partial cross-sectional schematic diagram;

[0028] Figure 5 for Figure 4 A schematic diagram of the front structure;

[0029] Figure 6 for Figure 5 Enlarged view of the connection between the middle connecting cylinder and the magnetic sliding plate;

[0030] Figure 7 for Figure 6 Enlarged view of point A;

[0031] Figure 8 This is a schematic diagram of the structure of Embodiment 2 proposed in this invention;

[0032] Figure 9 for Figure 8 Enlarged view of the structure at the center of the seat;

[0033] Figure 10 for Figure 8 Rear view diagram;

[0034] Figure 11 for Figure 8 A schematic diagram of the structure of the left-side connecting seat;

[0035] Figure 12 for Figure 11 A schematic diagram of the cross-sectional structure;

[0036] Figure 13 for Figure 12 Enlarged view of point B;

[0037] Figure 14 This is a schematic diagram from the left side showing the contact between the cold airflow and the shaft.

[0038] In the diagram: 1. Main body of the device; 2. Controller; 3. Processing area; 4. Telescopic component; 5. Connecting seat; 6. Placement seat; 7. Sliding rod; 8. First cylinder; 9. Clamping plate; 10. Guide rod; 11. Fourth spring; 12. Guide bar; 13. Connecting column; 14. Temporary storage bar; 15. Temporary storage slot; 16. Feeding cylinder; 17. Second cylinder; 18. Baffle plate; 19. Guide plate; 20. Pressing slot; 21. Through hole; 22. Third cylinder; 23. Abutting bar; 24. Connecting cylinder; 25. Electromagnet; 26. Columnar groove; 27. First one-way tube; 28. Piston block; 29. ​​First spring; 30. Magnetic sliding plate. 31 Temperature guiding column, 32 One-way channel, 33 Annular groove, 34 Rubber ring, 35 Connecting hole, 36 Vertical plate, 37 First piston plate, 38 L-shaped plate, 39 Gas accumulation cylinder, 40 First one-way port, 41 L-shaped abutment plate, 42 Mounting plate, 43 First U-shaped tube, 44 Jet tube, 45 Flat jet nozzle, 46 Rectangular guide plate, 47 Second spring, 48 Second U-shaped tube, 49 Connecting pipe, 50 Second one-way tube, 51 Piston cylinder, 52 Second one-way port, 53 Third one-way tube, 54 Second piston plate, 55 Third spring, 56 Annular cavity, 57 Negative pressure hole. Detailed Implementation

[0039] 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.

[0040] Example 1: Refer to Figures 1-7 A water pump rotor bearing press-fitting machine includes a main body 1 and a processing area 3 set on the upper end of the main body 1. The processing area 3 is a rectangular space. A controller 2 is also installed on the main body 1 for controlling various electrical components.

[0041] This also includes a limiting mechanism, which includes a placement seat 6. The upper end of the placement seat 6 is arc-shaped and used to place the rotor body. The rotor body is existing technology, specifically as follows: Figure 1 As shown, it consists of a cylindrical body and shafts at both ends. Further, the shafts are composed of a thin shaft away from the cylindrical body and a thick shaft close to the cylindrical body. During the press-fitting operation, the bearing will eventually be pressed to the connection between the thin shaft and the thick shaft. The upper rear side of the placement seat 6 is fitted with a first cylinder 8. The telescopic end of the first cylinder 8 is fixedly connected to a clamping plate 9. In actual use, the rotor to be pressed is placed on the arc surface of the placement seat 6, and then the second cylinder 17 is activated to extend, which can realize the downward movement of the clamping plate 9 and limit the rotor to be pressed.

[0042] This also includes a double-end pressing mechanism, which comprises two connecting seats 5, one of which is a fixed seat and the other is a movable seat. A telescopic component 4 for moving the corresponding connecting seat 5 left and right is installed on one side of the processing area 3. This telescopic component 4 can use either actuated telescopic or hydraulic telescopic methods to achieve the pressing operation. Each of the two connecting seats 5 has a horizontally extending connecting post 13 fixed to it. Each of the two connecting posts 13 has a pressing groove 20 on its opposite side. The pressing groove 20 is used to place the bearing to be pressed. The two pressing grooves 20 are opposite to each other. Each side wall has a through hole 21. The through hole 21 ensures that after the shaft passes through the bearing, it can pass through the through hole 21, thus fully pressing the bearing into the connection between the thin and thick shafts, achieving a complete press-fit operation. One side of the placement seat 6 is elastically connected to the corresponding connecting seat 5 via a fourth spring 11. A guide rod 10 is fixedly connected to the side of the placement seat 6 near the telescopic component 4. The other end of the guide rod 10 passes through the corresponding placement seat 6 and is slidably connected. With this structure, only a single drive source is needed to move the corresponding connecting seat 5, allowing the bearing to be fully pressed into both ends of the rotor. After subsequent retraction, it can be restored. Figure 1 This position facilitates the handling of the press-fitted rotor;

[0043] In this process area 3, two guide bars 12 are symmetrically and fixedly connected between the inner walls on the left and right sides. The connecting seat 5 on the side away from the telescopic component 4 is fixedly connected to the two guide bars 12. The placement seat 6 and the other connecting seat 5 are both guided and connected to the two guide bars 12. By using the guide bars 12, the movement of the placement seat 6 and the connecting seat 5 can be relatively stable and smooth.

[0044] The system also includes a feeding mechanism, which comprises two temporary storage bars 14 arranged symmetrically and fixedly connected to the upper ends of corresponding connecting seats 5. Temporary storage slots 15 are provided on opposite sides of each of the two temporary storage bars 14. A feeding cylinder 16 communicating with the temporary storage slot 15 is fixedly connected to the upper end of each of the two temporary storage bars 14. A third cylinder 22 is installed on the opposite sides of each of the two temporary storage bars 14. The telescopic end of each third cylinder 22 extends to the corresponding temporary storage slot 15, and a sliding abutment bar 23 is fixedly connected to the telescopic end of each third cylinder 22. A guide plate 19 is fixedly connected to opposite sides of each of the two temporary storage bars 14. A notch groove that mates with the guide plate 19 is provided on the inner top of each of the two pressing slots 20. Extension bars are fixedly connected to the opposite sides of 14. A second cylinder 17 is installed at the upper end of each extension bar. The telescopic ends of the two second cylinders 17 pass through the corresponding extension bars. A baffle plate 18 is fixedly connected to the telescopic ends of the two second cylinders 17. Before each bearing loading operation, multiple second cylinders 17 are activated and extended, causing the baffle plate 18 to move down, thereby blocking the opening of the pressing groove 20. After the bearing enters the pressing groove 20, it will not be pushed out of the pressing groove 20 due to inertia. During the specific loading operation, the height of the bearing is slightly lower than the height of the temporary storage groove 15, and the height of the abutment bar 23 is slightly lower than the height of the bearing. Multiple bearings are stacked in the loading cylinder 16, and the lowest bearing is located inside the temporary storage groove 15.

[0045] The system also includes a heating and lubrication mechanism, comprising two connecting cylinders 24 fixedly connected to the lower ends of corresponding temporary storage bars 14. Each connecting cylinder 24 is connected to a corresponding temporary storage groove 15. Each connecting cylinder 24 contains a vertically sliding magnetic sliding plate 30, and a temperature-conducting column 31 is fixedly connected to the upper end of each magnetic sliding plate 30. Each temperature-conducting column 31 contains an embedded heating element, which is a conventional heating coil. The heating temperature can be selected according to requirements; in this solution, the heating temperature can be 120℃-150℃ to heat the temperature-conducting column 31. It should be noted that the temperature should be adjusted according to actual needs. To ensure that the final bearing inner ring temperature is 80℃-120℃ before press-fitting, the lubricating oil has a better lubrication effect at this temperature, and the thermal expansion range of the bearing inner ring can also meet the actual requirements. The temperature-conducting column 31 is made of a temperature-conducting material with a low coefficient of thermal expansion. Each connecting cylinder 24 is equipped with an electromagnet 25 at its inner bottom. After each electromagnet 25 is energized, it attracts the adjacent surfaces of the corresponding magnetic sliding plate 30 with opposite polarities. The lower end of each magnetic sliding plate 30 is elastically connected to the inner bottom of the corresponding connecting cylinder 24 through a first spring 29. Furthermore, the outer ring diameter of the bearing is larger than the inner diameter of the connecting cylinder 24, and the temperature-conducting column 31 can fully contact the bearing inner ring and slide.

[0046] Each connecting cylinder 24 has a columnar groove 26 at its inner top, and a slidable piston block 28 is installed in each columnar groove 26. Each piston block 28 is fixedly connected to a corresponding magnetic sliding plate 30 via a fixing rod. The inner bottom of each columnar groove 26 is connected to a first one-way tube 27, which is a flexible tube, and its other end is connected to an external liquid lubricating oil tank. A one-way channel 32 is provided in the lower end of each temperature-conducting column 31, the corresponding fixing rod, and the piston block 28. An annular groove 33 is provided in the upper end of each temperature-conducting column 31. Rubber rings 34 are installed on the outer edges of the bearing. The rubber rings 34 are made of high-temperature resistant materials. When the rubber rings 34 are located inside the bearing, they are in a slightly compressed state to ensure that the rubber rings 34 can still fit with the inner ring of the bearing after thermal expansion. Each one-way channel 32 is connected to the corresponding annular groove 33 through two connecting holes 35. Each one-way channel 32 and the first one-way tube 27 are equipped with a one-way valve. The flow direction of the one-way valve inside the one-way channel 32 is from bottom to top, and the flow direction of the one-way valve inside the first one-way tube 27 is to enter the bottom space of the columnar groove 26 from the outside.

[0047] Before each pressing operation, the heating element is activated to heat the inner ring of the bearing, causing it to expand slightly. At the same time, in the initial state, the bottom space of the columnar groove 26, the one-way channel 32, the connecting hole 35, and the annular groove 33 are all filled with lubricating oil, and the lubricating oil level in the annular groove 33 is flush with the upper end face of the rubber ring 34. When the bearing is ready to be loaded, the electromagnet 25 is activated first. After the temperature guide column 31 moves down and leaves the inner ring of the bearing, the third cylinder 22 is activated, which drives the abutment bar 23 to move and push the bearing to the guide plate 19. The bearing enters the pressing groove 20 along the guide plate 19 and is in the ready-to-press state. During pressing, the telescopic component 4 is activated, and the second cylinder 17 is activated to retract, no longer blocking the bearing, thus realizing the pressing operation.

[0048] It should be noted that during the downward movement of the magnetic sliding plate 30, when it drives the temperature-conducting column 31 downward, the lubricating oil in the columnar groove 26 can be pressed into the annular groove 33 through the one-way channel 32. As the amount of oil in the annular groove 33 increases, it will evenly overflow the annular groove 33. The overflowing oil will evenly contact the inner ring of the bearing. With the downward movement of the rubber ring 34, a uniform oil film layer can be evenly "pulled out" on the inner wall of the bearing inner ring, which facilitates the subsequent press-fitting operation.

[0049] In this invention, in the initial state stage, multiple bearings are placed inside the two loading cylinders 16, and the lowest bearing is located in the temporary storage tank 15. Multiple second cylinders 17 are activated and extended, causing the baffle plate 18 to move down and block the opening of the pressing tank 20 to prevent subsequent bearings from being thrown out due to inertia after entering the pressing tank 20.

[0050] Before each press-fit, the heating element is activated to heat the inner ring of the bearing, causing slight thermal expansion. After a fixed time period, the bearing is fully heated, and the electromagnet 25 is activated, attracting the corresponding magnetic sliding plate 30, which moves the magnetic sliding plate 30 downward, thereby moving the temperature-conducting column 31 downward. During the downward movement, the magnetic sliding plate 30 drives the piston block 28 to slide down in the columnar groove 26 via the fixed rod, pressing the lubricating oil in the columnar groove 26 into the annular groove 33 through the one-way channel 32. As the oil in the annular groove 33 increases, it will evenly overflow the annular groove 33, and the overflowing oil will evenly contact the inner ring of the bearing. Combined with the downward movement of the rubber ring 34, a uniform oil film layer is "pulled out" on the inner wall of the bearing inner ring.

[0051] After the temperature guide column 31 moves down and leaves the inner ring of the bearing, the third cylinder 22 starts, driving the abutment bar 23 to move and abut the bearing against the guide plate 19. The bearing then enters the pressing slot 20 along the guide plate 19 and is in the pressing state. Subsequently, the electromagnet 25 is de-energized, and at the same time, the third cylinder 22 retracts, returning to its original position. Figure 5 state;

[0052] The first cylinder 8 extends, causing the clamping plate 9 to move downwards and limit the rotor to be pressed. The telescopic component 4 is activated, driving the corresponding connecting seat 5 to move. The two connecting columns 13 move relative to each other. The shaft passes through the bearing and then through the through hole 21, pressing the bearing completely into the connection between the thin shaft and the thick shaft, thus completing the pressing operation. During pressing, the second cylinder 17 retracts, no longer obstructing the bearing. Since the bearing has been heated and evenly lubricated, the pressing resistance is effectively reduced, ensuring the overall pressing is completed and reducing damage to the bearing and the rotor.

[0053] The telescopic component 4 drives the corresponding connecting seat 5 to return to its original position, and the placement seat 6 also returns to its original position under the action of the spring 11, returning to the initial state, making it convenient to pick up the pressed rotor. Then the first cylinder 8 retracts to release the limit, while the second cylinder 17 extends to prepare for the next operation.

[0054] Example 2: Refer to Figures 8-14The difference between this embodiment and Embodiment 1 is that it also includes a cooling mechanism. The cooling mechanism includes an L-shaped plate 38 fixedly connected to the side of the connecting seat 5 away from the telescopic component 4. A piston cylinder 51 is fixedly connected to one vertical side of the L-shaped plate 38. A first piston plate 37, which can slide left and right, is disposed inside the piston cylinder 51. A vertical plate 36 is fixedly connected to the lower end of another connecting seat 5. One side of the vertical plate 36 is fixedly connected to the first piston plate 37 via a sliding rod 7. A gas accumulation cylinder 39 is fixedly connected to one vertical side of the L-shaped plate 38. The gas storage cylinder 39 is provided with a second piston plate 54 that can slide left and right. One side of the second piston plate 54 is elastically connected to the corresponding side wall of the gas storage cylinder 39 through a third spring 55. The space on the side of the gas storage cylinder 39 away from the piston cylinder 51 is connected to the outside through a pressure stabilizing hole. The space on the side of the piston cylinder 51 close to the gas storage cylinder 39 is connected to the outside through a first one-way port 40. The space on the side of the piston cylinder 51 close to the gas storage cylinder 39 is connected to the space on the side of the gas storage cylinder 39 close to the piston cylinder 51 through a second one-way port 52.

[0055] The mounting plate 42 is installed on the placement seat 6. The two sides of the mounting plate 42 are fixedly connected to the second spring 47. The other ends of the two second springs 47 are fixedly connected to the jet tubes 44. The front side walls of the two jet tubes 44 are provided with flat jet nozzles 45. The two flat jet nozzles 45 are directly opposite the two thin shafts of the water pump rotor and initially cover the thin shafts. The opposite sides of the two jet tubes 44 are fixedly connected to the rectangular guide plates 46. The two rectangular guide plates 46 pass through the corresponding mounting plate 42 and are slidably connected. The opposite sides of the two connecting seats 5 are fixedly connected to the L-shaped abutment plates 41.

[0056] By utilizing the rectangular guide plate 46 in conjunction with the second spring 47, and since the two flat jet nozzles 45 continuously eject low-temperature gas, when the placement seat 6 moves, before the thin shaft body contacts the bearing, the corresponding jet cylinder 44 contacts the corresponding L-shaped abutment plate 41. In this way, the jet cylinder 44 changes from being initially stationary relative to the thin shaft body to subsequently moving relative to it. This method ensures that the cold airflow will never blow towards the connection between the thin shaft body and the bearing during the pressing process, preventing the cold airflow from lowering the bearing temperature at the beginning of the pressing stage and affecting the pressing process. Furthermore, in this method, when the airflow is ejected to the thin shaft body, although it contacts the thin shaft body from the rear, due to hydrodynamic effects, the gas will form a wall adhesion effect when passing through the convex structure, such as... Figure 14 As shown, the actual contact between the cold airflow and the shaft is relatively uniform, and the cooling effect is also relatively uniform.

[0057] Two jet tubes 44 are connected by a first U-shaped tube 43. The first U-shaped tube 43 is connected to the gas storage cylinder 39 near the piston cylinder 51 via a second one-way tube 50. The diameter of the second one-way tube 50 is one-third of the diameter of the second one-way port 52. Both connecting columns 13 have annular cavities 56 inside. Multiple negative pressure holes 57 are opened on the opposite sidewalls of the two annular cavities 56. The two annular cavities 56 are connected by a second U-shaped tube 48. The second U-shaped tube 48 and the second one-way tube 50 are connected by a connecting pipe 49. A third one-way tube 53 is connected to the second one-way port 52. Furthermore, the other end of the third one-way tube 53 is connected to an external liquid nitrogen tank. When a high-speed airflow is generated at the second one-way port 52, due to the high... The airflow generates low pressure, which can draw in some liquid nitrogen. After a small amount of liquid nitrogen enters, it mixes with the air, instantly cooling the air. It then enters the space on the side of the gas storage cylinder 39 near the piston cylinder 51 (in specific settings, the actual final gas temperature can be controlled by the diameter of the third one-way tube 53 in conjunction with the corresponding gas flow rate, so that it is near 0°C). Since the diameter of the second one-way tube 50 is small, when a large amount of gas is released, the space on the side of the gas storage cylinder 39 near the piston cylinder 51 will always be under high pressure, causing the second piston plate 54 to move and compress the third spring 55, thereby accumulating low-temperature gas. After the high-speed airflow is discharged from the second one-way tube 50, it finally enters the two jet tubes 44 through the first U-shaped tube 43.

[0058] The negative pressure generated by the high-speed airflow inside the second one-way tube 50 can reduce the overall air pressure in the space formed by the two annular cavities 56 and the second U-shaped tube 48 through the connecting pipe 49, and form negative pressure from multiple negative pressure holes 57. This negative pressure can limit the bearing and ensure that after the two baffles 18 move upward, the bearing is still relatively stable in the pressing groove 20 before pressing, ensuring the stable progress of subsequent pressing.

[0059] Furthermore, after the press-fitting is completed, during the retraction of the telescopic assembly 4, although the first piston plate 37 moves back relative to the piston cylinder 51, the second piston plate 54 will move back under the elastic action of the third spring 55, releasing the residual cold air. Under the elastic action of the second spring 47, during the retraction process, the flat jet nozzle 45 is again aimed at the press-fitting area, which can achieve rapid cooling of the press-fitting area and avoid the connection tightness caused by excessive bearing temperature or friction after press-fitting. This facilitates the subsequent operation process. In particular, this solution is more suitable for application scenarios where the bearing thermal expansion coefficient is greater than the shaft thermal expansion coefficient. Even if the final reduced temperature is lower than the room temperature, the bearing will still be tightly connected to the shaft.

[0060] One-way valves are installed inside the first one-way port 40, the second one-way port 52, the second one-way pipe 50, the third one-way pipe 53, and the connecting pipe 49. The one-way valve inside the first one-way port 40 allows the flow to enter the space near the gas accumulator 39 of the piston cylinder 51 from the outside. The one-way valve inside the second one-way port 52 allows the flow to enter the space near the piston cylinder 51 of the gas accumulator 39 from the piston cylinder 51. The one-way valve inside the third one-way pipe 53 allows the flow to enter the second one-way port 52 from the outside. The one-way valve inside the second one-way pipe 50 allows the flow to enter the first U-shaped pipe 43 from the gas accumulator 39. The one-way valve inside the connecting pipe 49 allows the flow to enter the second one-way pipe 50 from the second U-shaped pipe 48.

[0061] In this invention, the telescopic component 4 drives the corresponding connecting seat 5 to move for pressing operation. The vertical plate 36 at the lower end of the corresponding connecting seat 5 drives the first piston plate 37 to move inside the piston cylinder 51 via the sliding rod 7. High pressure is generated in the space near the gas storage cylinder 39 of the piston cylinder 51, and gas is forced into the space near the piston cylinder 51 of the gas storage cylinder 39 through the second one-way port 52. When a high-speed airflow is generated at the second one-way port 52, the high-speed airflow generates low pressure, and some liquid nitrogen is drawn in through the third one-way pipe 53. After a small amount of liquid nitrogen enters, it mixes with the air, instantly cooling the air, so that the temperature of the gas entering the space near the piston cylinder 51 of the gas storage cylinder 39 is close to 0°C. Since the diameter of the second one-way pipe 50 is one-third of the diameter of the second one-way port 52, when a large amount of gas is released, the space near the piston cylinder 51 of the gas storage cylinder 39 is always in a high-pressure state, pushing the second piston plate 54 to move and compressing the third spring 55, thereby realizing the accumulation of low-temperature gas.

[0062] The gas is released through the second one-way tube 50 and finally continuously ejected from the two flat jet nozzles 45 of the gas storage cylinder 39. Due to the hydrodynamic effect, the gas will form a wall adhesion effect when passing through the convex structure. The cold airflow actually has a relatively uniform contact with the shaft. During the pressing process, the cold airflow will never blow towards the connection between the thin shaft and the bearing, so as to achieve uniform cooling of the thin shaft, causing it to shrink, which further facilitates the subsequent pressing.

[0063] Before the bearing is ready for press fitting, a high-speed airflow is generated inside the second one-way tube 50. The resulting negative pressure reduces the overall air pressure in the space formed by the two annular cavities 56 and the second U-shaped tube 48 through the connecting pipe 49. Negative pressure is formed from multiple negative pressure holes 57 to limit the bearing and ensure that the bearing can be stably located in the press fitting groove 20 during the period before press fitting after the two baffles 18 move upward, thus ensuring the subsequent press fitting is carried out stably.

[0064] During the movement of the placement seat 6, when the thin shaft body does not contact the bearing, the corresponding jet tube 44 contacts the corresponding L-shaped abutment plate 41. The jet tube 44 changes from being relatively stationary with respect to the thin shaft body to moving relative to it, thus preventing the cold airflow from lowering the bearing temperature at the beginning of the pressing process and affecting the pressing process.

[0065] During the subsequent reset phase after press-fitting, the telescopic assembly 4 retracts, and the first piston plate 37 moves back relative to the piston cylinder 51. At this time, the third spring 55 is in a compressed state. Under the elastic action, the second piston plate 54 moves back, releasing the residual cold air. Under the elastic action of the second spring 47, during the retraction process, the flat jet nozzle 45 again targets the press-fitting area, achieving rapid cooling of the press-fitting area. This prevents the bearing from becoming loose due to excessive temperature immediately after press-fitting or high temperature generated by friction (when the connection tightness is relatively poor) and being touched or subjected to other external forces, thus improving the overall processing efficiency.

[0066] 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. A water pump rotor bearing press mounting machine comprising a device body (1) and a processing area (3) provided at the upper end of the device body (1), characterized in that, Also include: Limiting mechanism, the limiting mechanism includes the placement seat (6), the upper end of the placement seat (6) is arc-shaped, for placing the rotor body, the rear side upper end of the placement seat (6) is packed with the first air cylinder (8), the telescopic end of the first air cylinder (8) is fixedly connected with the clamping plate (9); Double-end press fitting mechanism, the double-end press fitting mechanism includes two connecting seats (5), one of the connecting seats (5) is a fixed seat, the other connecting seat (5) is a moving seat, one side of the processing area (3) is provided with a telescopic assembly (4) for moving the corresponding connecting seat (5) left and right, the connecting column (13) fixedly connected with the two connecting seats (5) is provided with a connecting column (13) fixedly connected with the two connecting seats (5), the opposite sides of the two connecting columns (13) are provided with a to-be-pressed groove (20), the opposite sides of the two to-be-pressed grooves (20) are provided with a through hole (21), one side of the placement seat (6) is elastically connected with the corresponding connecting seat (5) through the fourth spring (11), one side of the placement seat (6) close to the telescopic assembly (4) is fixedly connected with the guide rod (10), the other end of the guide rod (10) penetrates through the corresponding placement seat (6) and is slidingly connected; Also include cooling mechanism, the cooling mechanism includes L-shaped plate (38) fixedly connected on one side of the connecting seat (5) away from the telescopic assembly (4), the vertical part of the L-shaped plate (38) is fixedly connected with the piston cylinder (51), the piston cylinder (51) is provided with a first piston plate (37) that can slide left and right, the lower end of the other connecting seat (5) is fixedly connected with the vertical plate (36), one side of the vertical plate (36) is fixedly connected with the first piston plate (37) through the sliding rod (7), the vertical part of the L-shaped plate (38) is fixedly connected with the gas accumulation cylinder (39), the gas accumulation cylinder (39) is provided with a second piston plate (54) that can slide left and right, one side of the second piston plate (54) is elastically connected with the corresponding side wall of the gas accumulation cylinder (39) through the third spring (55), the space on the side of the gas accumulation cylinder (39) away from the piston cylinder (51) is communicated with the outside through the pressure stabilizing hole, the space on the side of the piston cylinder (51) close to the gas accumulation cylinder (39) is communicated with the outside through the first one-way port (40), the space on the side of the piston cylinder (51) close to the gas accumulation cylinder (39) is communicated with the space on the side of the gas accumulation cylinder (39) close to the piston cylinder (51) through the second one-way port (52). The mounting plate (42) is fixedly connected with the second spring (47) on both sides, the other end of the second spring (47) is fixedly connected with the air jet cylinder (44), the flat air jet (45) is arranged on the front side wall of the air jet cylinder (44), the opposite side of the air jet cylinder (44) is fixedly connected with the rectangular guide plate (46), the rectangular guide plate (46) penetrates through the corresponding mounting plate (42) and is connected in a sliding mode, the opposite side of the connecting seat (5) is fixedly connected with the L-shaped abutting plate (41), the two air jet cylinders (44) are communicated through the first U-shaped pipe (43), the first U-shaped pipe (43) is communicated with the space on the side of the gas storage cylinder (39) close to the piston cylinder (51) through the second one-way pipe (50), the diameter of the second one-way pipe (50) is one third of the diameter of the second one-way port (52), the annular cavity (56) is arranged in the connecting column (13), a plurality of negative pressure holes (57) are arranged on the opposite side walls of the annular cavity (56), the two annular cavities (56) are communicated through the second U-shaped pipe (48), the second U-shaped pipe (48) and the second one-way pipe (50) are communicated through the connecting pipe (49), and the third one-way pipe (53) is communicated at the second one-way port (52).

2. The water pump rotor bearing press mounting machine according to claim 1, characterized in that, The left and right side inner walls of the processing area (3) are fixedly connected with two guide strips (12) in a symmetrical mode, the connecting seat (5) away from the telescopic assembly (4) is fixedly connected with the two guide strips (12), and the placing seat (6) and the other connecting seat (5) are guidedly connected to the two guide strips (12).

3. The water pump rotor bearing press mounting machine of claim 1, wherein, The feeding mechanism comprises two temporary storage strips (14), the two temporary storage strips (14) are arranged in a symmetrical mode and fixedly connected to the upper ends of the corresponding connecting seats (5), the opposite sides of the two temporary storage strips (14) are provided with temporary storage grooves (15), the upper ends of the two temporary storage strips (14) are fixedly connected with feeding cylinders (16) communicated with the temporary storage grooves (15), the opposite sides of the two temporary storage strips (14) are fixedly connected with guide plates (19), and the inner top portions of the two waiting pressing grooves (20) are provided with notch grooves matched with the guide plates (19).

4. The water pump rotor bearing press mounting machine of claim 3, wherein, The opposite sides of the two temporary storage strips (14) are fixedly connected with extension strips, the upper ends of the two extension strips are provided with second cylinders (17), the telescopic ends of the two second cylinders (17) penetrate through the corresponding extension strips, and the telescopic ends of the two second cylinders (17) are fixedly connected with shielding plates (18).

5. The water pump rotor bearing press mounting machine of claim 3, wherein, The heating lubricating mechanism comprises two connecting barrels (24) fixedly connected to the lower ends of the corresponding temporary storage strips (14) respectively, each connecting barrel (24) is communicated with the corresponding temporary storage groove (15), each connecting barrel (24) is provided with a magnetic sliding plate (30) capable of sliding up and down, the upper end of each magnetic sliding plate (30) is fixedly connected with a temperature guide column (31), each temperature guide column (31) is embedded with an electric heating assembly, the inner bottom of each connecting barrel (24) is provided with an electromagnet (25), each electromagnet (25) is attracted to the adjacent surface of the corresponding magnetic sliding plate (30) after being electrified, and the lower end of each magnetic sliding plate (30) is elastically connected to the inner bottom of the corresponding connecting barrel (24) through a first spring (29).

6. The water pump rotor bearing press mounting machine of claim 5, wherein, The inner top of each connecting barrel (24) is provided with a cylindrical groove (26), each cylindrical groove (26) is provided with a piston block (28) capable of sliding, each piston block (28) is fixedly connected with the corresponding magnetic sliding plate (30) through a fixed rod, the inner bottom of each cylindrical groove (26) is communicated with a first one-way pipe (27), the lower end of each temperature guide column (31), the corresponding fixed rod and the piston block (28) are all provided with a one-way channel (32), the upper end of each temperature guide column (31) is provided with an annular groove (33), the outer side edge of each temperature guide column (31) is provided with a rubber ring (34), and each one-way channel (32) is communicated with the corresponding annular groove (33) through two connecting holes (35).

7. The water pump rotor bearing press mounting machine of claim 6, wherein, Each one-way channel (32) and first one-way pipe (27) is internally provided with a one-way valve, the flow direction of the one-way valve in the one-way channel (32) is from bottom to top, and the flow direction of the one-way valve in the first one-way pipe (27) is one-way from outside to the bottom space of the cylindrical groove (26).

8. The water pump rotor bearing press mounting machine of claim 1, wherein, The first one-way port (40), the second one-way port (52), the second one-way pipe (50), the third one-way pipe (53) and the connecting pipe (49) are internally provided with one-way valves, the flow direction of the one-way valve in the first one-way port (40) is one-way from the outside to the space on the side of the piston cylinder (51) close to the gas storage cylinder (39), the flow direction of the one-way valve in the second one-way port (52) is one-way from the piston cylinder (51) to the space on the side of the gas storage cylinder (39) close to the piston cylinder (51), the flow direction of the one-way valve in the third one-way pipe (53) is one-way from the outside to the second one-way port (52), the flow direction of the one-way valve in the second one-way pipe (50) is one-way from the gas storage cylinder (39) to the first U-shaped pipe (43), and the flow direction of the one-way valve in the connecting pipe (49) is one-way from the second U-shaped pipe (48) to the second one-way pipe (50).

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