Gear press mounting process with ultra-high pressure stabilizing regulation system and control method

Abstract

The application discloses a kind of superhigh pressure pressure regulating system and control method for gear press mounting process, including motor, superhigh pressure plunger pump, pressure regulating valve, first check valve, pressure stabilizing damper block, second check valve, first pressure sensor, second pressure sensor, unloading valve;In superhigh pressure system, flow is small, pressure regulating valve displacement opening is very small, and pressure fluctuation is prone to occur, gear tensioning tool needs to realize linear loading and pressure relief in 0-200MPa range, when the present application is pressurized and regulated, oil passes through first check valve to pressurize tensioning tool, first check valve can inhibit pressure fluctuation in tool, when pressure is reduced and regulated, pressure in tool is reduced by pressure stabilizing damper block, damping effect can reduce working internal pressure fluctuation, whether pressure is in place is fed back through two groups of pressure sensors, pressure reduction process will be slowed down after damper block is blocked, when the difference between pressure in tool and pump outlet pressure is greater than the opening pressure of second check valve, pressure in tool can be relieved through second check valve, and the pressure relief process maintains good linearity.

Description

Technical Field

[0001] This invention relates to the field of ultra-high pressure hydraulic transmission, specifically to an ultra-high pressure stabilizing and regulating system and control method for gear pressing processes. Background Technology

[0002] In the gear press-fitting process, ultra-high pressure hydraulic oil is required to enter the tensioning fixture, causing it to expand or depressurize. To ensure control accuracy during the press-fitting process, it is necessary to be able to adjust and control the pressure increase and decrease values, as well as the pressure change time, of the tensioning fixture. While a pressure regulating valve can control the pressure of the ultra-high pressure system, the pressure inside the tensioning fixture can reach up to 200 MPa, and the ultra-high pressure flow rate is relatively small. Furthermore, the valve core displacement of the pressure regulating valve is small, making pressure regulation highly susceptible to fluctuations. This results in significant pressure fluctuations within the tensioning fixture, affecting the press-fitting effect. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides an ultra-high pressure stabilization and adjustment system and control method for gear press-fitting processes. This system enables linear adjustment of the internal pressure of the tensioning fixture within the gear press-fitting process from 0 to 200 MPa, and effectively stabilizes the pressure in the tensioning chamber.

[0004] The objective of this invention is achieved through the following technical solution:

[0005] A high-pressure stabilizing and regulating system for gear press fitting process includes a motor, a high-pressure plunger pump, a pressure regulating valve, a first check valve, a pressure stabilizing damping block, a second check valve, a first pressure sensor, a second pressure sensor, and an unloading valve.

[0006] The motor drives the ultra-high pressure plunger pump to rotate and discharge hydraulic oil;

[0007] The inlet of the pressure regulating valve is connected to the outlet of the ultra-high pressure plunger pump, and the outlet is connected to the oil tank.

[0008] The first pressure sensor is connected to the outlet oil line of the ultra-high pressure plunger pump to provide feedback on the inlet pressure of the pressure regulating valve.

[0009] The first one-way valve has its forward port connected to the outlet of the ultra-high pressure plunger pump and its reverse port connected to the inlet of the tensioning fixture. The forward opening pressure is less than 1 bar.

[0010] One end of the pressure-stabilizing damping block is connected to the outlet of the ultra-high pressure plunger pump, and the other end is connected to the inlet of the tensioning fixture.

[0011] The second one-way valve has its reverse port connected to the outlet of the ultra-high pressure plunger pump and its forward port connected to the inlet of the tensioning fixture. The forward opening pressure is greater than 10 MPa, and the opening pressure can be set by the spring preload.

[0012] The second pressure sensor is connected to the oil inlet circuit of the tensioning fixture to provide feedback on the oil pressure inside the tensioning fixture.

[0013] One port of the unloading valve is connected to the oil inlet of the tensioning fixture, and the other port is connected to the oil tank.

[0014] Furthermore, the pressure regulating valve is an electro-proportional pressure regulating valve or a hydraulically controlled proportional pressure regulating valve, and the set pressure can be linearly adjusted according to the current signal or hydraulic pressure.

[0015] Furthermore, the voltage-stabilizing damping block consists of multiple threaded damping holes connected in series.

[0016] Furthermore, the unloading valve is a two-position two-way ultra-high pressure electromagnetic shut-off valve, which is shut off and disconnected at both ports when power is off.

[0017] Furthermore, the ultra-high pressure plunger pump is a radial plunger pump with a maximum output pressure greater than 200 MPa.

[0018] A control method for an ultra-high pressure stabilizing and regulating system used in gear press fitting process, wherein the positive opening pressure of the second one-way valve needs to be set to be greater than the pressure fluctuation amplitude of the pressure regulating valve, and the tensioning pressure control method and pressure stabilization process in gear press fitting process includes three working conditions: tensioning and pressurizing, tensioning pressure holding, and tensioning and depressurizing, as detailed below:

[0019] Tensioning and pressurizing process: By adjusting the current of the pressure regulating valve or the external control pressure, the pump outlet pressure is increased at a certain slope. When there is pressure fluctuation in the pressure regulating valve, if the inlet pressure of the pressure regulating valve is greater than the pressure inside the tensioning fixture, the pump outlet pressure is transmitted to the tensioning fixture through the first one-way valve. The pressure inside the fixture increases with the set pressure of the pressure regulating valve. When the pressure fluctuation value of the pressure regulating valve is less than the pressure inside the tensioning fixture, because the damping orifice inside the pressure stabilizing damping block is very small and has a strong throttling effect, its pressure reduction is much smaller than the fluctuation amplitude of the pressure regulating valve. During the tensioning and pressurizing process, the feedback value of the second pressure sensor is used to determine whether the tensioning pressure has reached the set pressure.

[0020] Tensioning pressure maintenance process: When the pressure regulating valve is set to a fixed value but the pump outlet pressure fluctuates, when the pressure fluctuation increases upward, the pump outlet pressure is quickly transmitted to the tensioning fixture through the first check valve, and the pressure inside the fixture increases rapidly. When the pressure regulating valve pressure decreases downward, the first check valve isolates the tensioning pressure from the pump outlet pressure in the opposite direction. The oil inside the tensioning fixture is connected to the pump outlet oil through the damping hole of the pressure stabilizing damping block. Because the damping hole is very small and has a strong throttling effect, the tensioning pressure slowly decreases towards the pump outlet pressure. The magnitude of the pressure decrease is much smaller than the downward fluctuation of the pressure regulating valve. Therefore, the pressure inside the tensioning fixture fluctuates slightly near the peak pressure of the pressure fluctuation of the pressure regulating valve, thereby achieving the effect of stabilizing the tensioning pressure.

[0021] Tensioning and decompression process: By adjusting the current of the pressure regulating valve or the external control pressure, the pump outlet pressure is reduced at a certain slope. The first check valve isolates the tensioning pressure from the pump outlet pressure in the opposite direction. The oil in the tensioning fixture is connected to the pump outlet oil through the damping hole of the pressure stabilizing damping block. The pressure reduction fluctuation amplitude in the fixture is less than the pump outlet pressure fluctuation amplitude, and the pressure reduction in the fixture lags behind the pump outlet pressure. The more internal thread damping holes in the pressure stabilizing damping block and the smaller the damping holes, the smaller the pressure fluctuation amplitude and the longer the pressure lag time in the fixture. During the tensioning and decompression process, the feedback value of the first pressure sensor is used to determine whether the tensioning pressure has reached the set pressure. After the pump outlet pressure reaches the set value, the current of the pressure regulating valve or the external control pressure is maintained, waiting for the pressure in the tensioning fixture to decrease to the set value.

[0022] Furthermore, when the damping orifice in the pressure-stabilizing damping block becomes blocked, causing the throttling orifice to be too small or completely disconnected, the tensioning and pressurizing process and the tensioning pressure holding process are basically unaffected. During the tensioning and depressurizing process, the pressure reduction lag time in the tensioning fixture will become longer. After the damping block is completely blocked, the tensioning fixture cannot complete the tensioning and depressurizing process. The second one-way valve can achieve the function of reducing tensioning pressure and stabilizing pressure.

[0023] When the pressure regulating valve is adjusted to reduce pressure, when the difference between the pump outlet pressure and the pressure inside the tensioning fixture is greater than the set opening pressure of the second check valve, the oil inside the tensioning fixture is discharged through the second check valve to the pump outlet (pressure regulating valve inlet). When the pressure of the pressure regulating valve fluctuates, when the pressure regulating pressure fluctuates upward so that the difference between the pump outlet pressure and the pressure inside the tensioning fixture is less than the opening pressure of the second check valve, the pressure in the tensioning chamber remains unchanged, which can effectively stabilize the pressure in the tensioning chamber. When the pressure value fed back by the first pressure sensor reaches the set pressure in the tensioning chamber, the pressure in the tensioning chamber detected by the second pressure sensor will be greater than the value of the first pressure sensor (the difference is the opening pressure of the second check valve). Therefore, in the tensioning and pressure reduction control, the final pressure of the pressure regulating valve needs to be set to be a certain value lower than the final pressure inside the required tensioning fixture (the difference is the opening pressure of the second check valve), and the feedback value of the second pressure sensor is used to determine whether the tensioning pressure has reached the set pressure.

[0024] When the pressure of the pressure regulating valve is reduced to zero, the tensioning fixture will still be locked at a certain pressure by the second one-way valve. The tensioning pressure can be completely released by energizing the unloading valve.

[0025] The beneficial effects of this invention are as follows:

[0026] 1. This invention can be used in ultra-high pressure hydraulic systems of 200MPa level to achieve adjustment of loading pressure.

[0027] 2. This invention can control the tensioning pressure to reduce pressure fluctuations and achieve linear adjustment of the tensioning pressure.

[0028] 3. This invention can completely relieve the pressure in the tension chamber. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the ultra-high pressure stabilizing and regulating system for gear press fitting process according to an embodiment of the present invention.

[0030] Figure 2 This is an oil circuit diagram of the pressure stabilization control process within the tensioning fixture according to an embodiment of the present invention.

[0031] Figure 3 This is a diagram of the pressure reduction and stabilization control oil circuit within the tensioning fixture according to an embodiment of the present invention.

[0032] Figure 4 This is a comparison diagram of the pressure stabilization curves during the tightening and holding processes of an embodiment of the present invention.

[0033] Figure 5 This is a comparison diagram of the pressure stabilization curves during the tensioning, decompression, and pressure holding processes according to an embodiment of the present invention.

[0034] Figure 6 This is a comparison chart of the tensioning pressure reduction curves when the pressure-stabilizing damping block is blocked and no second check valve is installed.

[0035] Figure 7 This is a diagram of the pressure reduction and stabilization control oil circuit in the tensioning fixture after the pressure-stabilizing damping block is blocked, according to an embodiment of the present invention.

[0036] Figure 8 This is a comparison chart of the pressure stabilization curves during the tightening, decompression, and pressure holding processes of the pressure stabilizing damping block after blockage, according to an embodiment of the present invention.

[0037] In the diagram, 1 is the motor, 2 is the ultra-high pressure plunger pump, 3 is the regulating valve, 4 is the first check valve, 5 is the pressure stabilizing damping block, 6 is the second check valve, 7 is the first pressure sensor, 8 is the second pressure sensor, 9 is the unloading valve, and 10 is the tensioning fixture. Detailed Implementation

[0038] The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments. The purpose and effects of the present invention will become clearer. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0039] like Figure 1 As shown, the ultra-high pressure stabilizing and regulating system for gear press fitting in this embodiment includes a motor 1, an ultra-high pressure plunger pump 2, a pressure regulating valve 3, a first check valve 4, a pressure stabilizing damping block 5, a second check valve 6, a first pressure sensor 7, a second pressure sensor 8, and an unloading valve 9.

[0040] Motor 1 drives ultra-high pressure plunger pump 2 to rotate and discharge hydraulic oil;

[0041] The inlet of the pressure regulating valve 3 is connected to the outlet of the ultra-high pressure plunger pump 2, and the outlet is connected to the oil tank. The pressure regulating valve 3 is an electro-proportional pressure regulating valve or a hydraulic proportional pressure regulating valve. The set pressure can be linearly adjusted according to the current signal or hydraulic pressure.

[0042] The first pressure sensor 7 is connected to the outlet oil line of the ultra-high pressure plunger pump 2 to provide feedback on the inlet pressure of the pressure regulating valve.

[0043] The first check valve 4 has its forward port connected to the outlet of the ultra-high pressure plunger pump 2 and its reverse port connected to the inlet of the tensioning fixture 10. The forward opening pressure is less than 1 bar.

[0044] One end of the pressure stabilizing damping block 5 is connected to the outlet of the ultra-high pressure plunger pump 2, and the other end is connected to the inlet of the tensioning fixture 10. The pressure stabilizing damping block consists of multiple threaded damping holes connected in series.

[0045] The second check valve 6 has its reverse port connected to the outlet of the ultra-high pressure plunger pump 2 and its forward port connected to the inlet of the tensioning fixture 10. The forward opening pressure is greater than 10 MPa and can be set by the spring preload.

[0046] The second pressure sensor 8 is connected to the oil inlet circuit of the tensioning fixture 10 to provide feedback on the oil pressure inside the tensioning fixture.

[0047] One port of the unloading valve 9 is connected to the oil inlet of the tensioning fixture 10, and the other port is connected to the oil tank. The unloading valve is a two-position two-way ultra-high pressure electromagnetic shut-off valve. When the power is off, both ports are shut off and disconnected.

[0048] The positive opening pressure of the second one-way valve 6 needs to be set to be greater than the pressure fluctuation amplitude of the pressure regulating valve 3. The tensioning pressure control method and pressure stabilization process in the gear press-fitting process includes three working conditions: tensioning and pressurizing, tensioning pressure holding, and tensioning and depressurizing. Taking the pressure fluctuation amplitude of the pressure regulating valve ±5Mpa as an example, the details are as follows:

[0049] The process of tightening and pressurizing: such as Figure 2 As shown, the pump outlet pressure is increased at a certain slope by adjusting the current of the pressure regulating valve 3 or the external control pressure. When there is pressure fluctuation in the pressure regulating valve 3, if the inlet pressure of the pressure regulating valve is greater than the pressure inside the tensioning fixture, the pump outlet pressure is transmitted to the tensioning fixture through the first one-way valve 4. The pressure inside the fixture increases with the set pressure of the pressure regulating valve. When the pressure fluctuation value of the pressure regulating valve is less than the pressure inside the tensioning fixture, the pressure reduction is much smaller than the fluctuation amplitude of the pressure regulating valve 6 because the damping orifice inside the pressure stabilizing damping block 5 is very small and has a strong throttling effect. During the tensioning pressurization process, the feedback value of the second pressure sensor 8 is used to determine whether the tensioning pressure has reached the set pressure.

[0050] Tensioning pressure maintenance process: When the pressure of the pressure regulating valve 3 is set to a fixed value but the pump outlet pressure fluctuates, when the pressure fluctuation increases upward, the pump outlet pressure is quickly transmitted to the tensioning fixture through the first one-way valve 4, and the pressure inside the fixture increases rapidly. When the pressure fluctuation of the pressure regulating valve decreases downward, the first one-way valve 4 isolates the tensioning pressure from the pump outlet pressure in the opposite direction. The oil inside the tensioning fixture is connected to the pump outlet oil through the damping hole of the pressure stabilizing damping block 5. Since the damping hole is very small and has a strong throttling effect, the tensioning pressure slowly decreases towards the pump outlet pressure. The magnitude of the pressure decrease is much smaller than the downward fluctuation of the pressure regulating valve. Therefore, the pressure inside the tensioning fixture fluctuates slightly near the peak pressure of the pressure fluctuation of the pressure regulating valve, thereby achieving the effect of stabilizing the tensioning pressure.

[0051] The process of tightening and decompression: such as Figure 3 As shown, the pump outlet pressure is reduced at a certain slope by the current or external control pressure of the pressure regulating valve 3. The first one-way valve 4 isolates the tensioning pressure from the pump outlet pressure in the opposite direction. The oil in the tensioning fixture is connected to the pump outlet oil through the damping hole of the pressure stabilizing damping block 5. The pressure reduction fluctuation amplitude in the fixture is smaller than the pump outlet pressure fluctuation amplitude, and the pressure reduction in the fixture lags behind the pump outlet pressure. The more internal thread damping and the smaller the damping hole of the pressure stabilizing damping block 5, the smaller the pressure fluctuation amplitude and the longer the pressure lag time in the fixture. During the tensioning and pressure reduction process, the feedback value of the first pressure sensor 7 is used to determine whether the tensioning pressure has reached the set pressure. After the pump outlet pressure reaches the set value, the current of the pressure regulating valve or the external control pressure is maintained, waiting for the pressure in the tensioning fixture to decrease to the set value.

[0052] like Figure 4 As shown, the curve of the tensioning pressure rising from 100MPa to 200MPa and then maintaining that pressure shows a maximum pressure fluctuation of 10MPa at the pump outlet pressure during both the rise and the pressure maintenance phases. After the pressure stabilization adjustment of this invention, the amplitude of the pressure fluctuation in the tensioning chamber is reduced to 2MPa.

[0053] like Figure 5 As shown, the curve of the tensioning pressure being reduced from 200MPa to 120MPa and then maintained shows that the pump outlet pressure fluctuates by a maximum difference of 10MPa during both the pressure increase and pressure maintenance. After the pressure stabilization adjustment of the present invention, the fluctuation amplitude during the pressure reduction process of the tensioning chamber is reduced to 1MPa, and the fluctuation amplitude during the pressure maintenance process is reduced to 2MPa.

[0054] When the damping orifice inside the pressure-stabilizing damping block 5 becomes blocked, causing the throttling orifice to be too small or completely disconnected, its tensioning and pressurizing process and tensioning pressure holding process are basically unaffected. However, the pressure reduction lag time inside the tensioning fixture will become longer during the tensioning and depressurization process. If the system does not have a second check valve 6 installed, the tensioning fixture will not be able to complete the tensioning and depressurization process after the damping block becomes completely blocked.

[0055] like Figure 6 The figure shows the curve of the tensioning pressure being reduced from 200MPa to 100MPa (pressure reduction set time 10s) and maintained when the damping orifice in the pressure stabilizing damping block 5 is reduced due to the decrease in the blockage of the second one-way valve 6 in a system without the second one-way valve 6. When the pump outlet pressure drops to 100MPa, the tensioning pressure only drops to 180MPa. After 20s, the tensioning pressure still has not dropped to 100MPa. The pressure reduction pressure and pressure reduction time are not controlled.

[0056] This invention, by adding a second one-way valve 6, can control the pressure reduction process and stabilize the pressure after the pressure-stabilizing damping block 5 is blocked.

[0057] like Figure 7 As shown, when the pressure regulating valve 3 is adjusted to reduce pressure, when the difference between the pump outlet pressure and the pressure inside the tensioning fixture is greater than the set opening pressure of the second one-way valve 6, the oil inside the tensioning fixture is discharged through the second one-way valve 6 to the pump outlet (pressure regulating valve inlet). When the pressure of the pressure regulating valve 3 fluctuates, when the pressure regulating pressure fluctuates upward so that the difference between the pump outlet pressure and the pressure inside the tensioning fixture is less than the opening pressure of the second one-way valve 6, the pressure in the tensioning chamber remains unchanged, which can effectively stabilize the pressure in the tensioning chamber. When the pressure value fed back by the first pressure sensor 7 reaches the set pressure in the tensioning chamber, the pressure in the tensioning chamber detected by the second pressure sensor 8 will be greater than the value of the first pressure sensor (the difference is the opening pressure of the second one-way valve). Therefore, in the tensioning and pressure reduction control, the final pressure of the pressure regulating valve 3 needs to be set to be a certain value lower than the required final pressure inside the tensioning fixture (the difference is half the opening pressure of the second one-way valve), and the feedback value of the second pressure sensor 8 is used to determine whether the tensioning pressure has reached the set pressure.

[0058] After designing the second check valve circuit in this invention, the opening pressure of the second check valve 6 is set to 12MPa. If the pressure-stabilizing damping block becomes blocked, such as... Figure 8 As shown, the curve of the tensioning pressure being reduced from 200MPa to 100MPa (reduction time set at 10s) and maintained shows that the fluctuation range of the tensioning pressure during the reduction process is much smaller than that of the pump outlet pressure. The tensioning pressure can be reduced to 100MPa within 10s. Due to the influence of the opening pressure of the second one-way valve 6, the final pressure of the pressure regulating valve needs to be set to 94MPa to ensure that the pressure in the tensioning chamber can be reduced to 100MPa.

[0059] When the pressure of the pressure regulating valve 3 is reduced to zero, the tensioning fixture will still be locked at a certain pressure by the second one-way valve 6. The tensioning pressure can be completely released by energizing the unloading valve 9.

[0060] It will be understood by those skilled in the art that the above descriptions are merely preferred examples of the invention and are not intended to limit the invention. Although the invention has been described in detail with reference to the foregoing examples, those skilled in the art can still modify the technical solutions described in the foregoing examples or make equivalent substitutions for some of the technical features. All modifications and equivalent substitutions made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A high-pressure stabilizing and regulating system for gear press-fitting process, characterized in that, Includes a motor, an ultra-high pressure plunger pump, a pressure regulating valve, a first check valve, a pressure stabilizing damping block, a second check valve, a first pressure sensor, a second pressure sensor, and an unloading valve; The motor drives the ultra-high pressure plunger pump to rotate and discharge hydraulic oil; The inlet of the pressure regulating valve is connected to the outlet of the ultra-high pressure plunger pump, and the outlet is connected to the oil tank. The pressure regulating valve is an electro-proportional pressure regulating valve or a hydraulically controlled proportional pressure regulating valve. The set pressure can be linearly adjusted according to the current signal or hydraulic pressure. The first pressure sensor is connected to the outlet oil line of the ultra-high pressure plunger pump to provide feedback on the inlet pressure of the pressure regulating valve. The first one-way valve has its forward port connected to the outlet of the ultra-high pressure plunger pump and its reverse port connected to the inlet of the tensioning fixture. The forward opening pressure is less than 1 bar. One end of the pressure-stabilizing damping block is connected to the outlet of the ultra-high pressure plunger pump, and the other end is connected to the inlet of the tensioning fixture. The pressure-stabilizing damping block consists of multiple threaded damping holes connected in series. The second one-way valve has its reverse port connected to the outlet of the ultra-high pressure plunger pump and its forward port connected to the inlet of the tensioning fixture. The forward opening pressure is greater than 10 MPa, and the opening pressure can be set by the spring preload. The second pressure sensor is connected to the oil inlet circuit of the tensioning fixture to provide feedback on the oil pressure inside the tensioning fixture. One port of the unloading valve is connected to the oil inlet of the tensioning fixture, and the other port is connected to the oil tank. The unloading valve is a two-position two-way ultra-high pressure electromagnetic shut-off valve, which is shut off and disconnected when the power is off.

2. The ultra-high pressure stabilizing and regulating system for gear press-fitting process according to claim 1, characterized in that, The positive opening pressure of the second one-way valve needs to be set to be greater than the pressure fluctuation amplitude of the pressure regulating valve. The tensioning pressure control method and pressure stabilization process in the gear press fitting process includes three working conditions: tensioning and pressurizing, tensioning pressure holding, and tensioning and depressurizing.

3. The ultra-high pressure stabilizing and regulating system for gear press-fitting process according to claim 2, characterized in that, Tensioning and pressurizing process: By adjusting the current of the pressure regulating valve or the external control pressure, the pump outlet pressure is increased at a certain slope. When there is pressure fluctuation in the pressure regulating valve, if the inlet pressure of the pressure regulating valve is greater than the pressure inside the tensioning fixture, the pump outlet pressure is transmitted to the tensioning fixture through the first one-way valve. The pressure inside the fixture increases with the set pressure of the pressure regulating valve. When the pressure fluctuation value of the pressure regulating valve is less than the pressure inside the tensioning fixture, because the damping orifice inside the pressure stabilizing damping block is very small and has a strong throttling effect, its pressure reduction is much smaller than the fluctuation amplitude of the pressure regulating valve. During the tensioning and pressurizing process, the feedback value of the second pressure sensor is used to determine whether the tensioning pressure has reached the set pressure.

4. The ultra-high pressure stabilizing and regulating system for gear press-fitting process according to claim 2, characterized in that, Tensioning pressure maintenance process: When the pressure regulating valve is set to a fixed value but the pump outlet pressure fluctuates, when the pressure fluctuation increases upward, the pump outlet pressure is quickly transmitted to the tensioning fixture through the first check valve, and the pressure inside the fixture increases rapidly. When the pressure regulating valve pressure decreases downward, the first check valve isolates the tensioning pressure from the pump outlet pressure in the opposite direction. The oil inside the tensioning fixture is connected to the pump outlet oil through the damping hole of the pressure stabilizing damping block. Because the damping hole is very small and has a strong throttling effect, the tensioning pressure slowly decreases towards the pump outlet pressure. The magnitude of the pressure decrease is much smaller than the downward fluctuation of the pressure regulating valve. Therefore, the pressure inside the tensioning fixture fluctuates slightly near the peak pressure of the pressure fluctuation of the pressure regulating valve, thereby achieving the effect of stabilizing the tensioning pressure.

5. The ultra-high pressure stabilizing and regulating system for gear press-fitting process according to claim 2, characterized in that, Tensioning and decompression process: By adjusting the current of the pressure regulating valve or the external control pressure, the pump outlet pressure is reduced at a certain slope. The first check valve isolates the tensioning pressure from the pump outlet pressure in the opposite direction. The oil in the tensioning fixture is connected to the pump outlet oil through the damping hole of the pressure stabilizing damping block. The pressure reduction fluctuation amplitude in the fixture is less than the pump outlet pressure fluctuation amplitude, and the pressure reduction in the fixture lags behind the pump outlet pressure. The more internal thread damping holes in the pressure stabilizing damping block and the smaller the damping holes, the smaller the pressure fluctuation amplitude and the longer the pressure lag time in the fixture. During the tensioning and decompression process, the feedback value of the first pressure sensor is used to determine whether the tensioning pressure has reached the set pressure. After the pump outlet pressure reaches the set value, the current of the pressure regulating valve or the external control pressure is maintained, waiting for the pressure in the tensioning fixture to decrease to the set value.

6. The ultra-high pressure stabilizing and regulating system for gear press-fitting process according to claim 1, characterized in that, When the damping orifice in the pressure-stabilizing damping block becomes blocked, causing the throttling orifice to be too small or completely disconnected, the tensioning and pressurizing process and the tensioning pressure holding process are basically unaffected. During the tensioning and depressurizing process, the pressure reduction lag time in the tensioning fixture will become longer. After the damping block is completely blocked, the tensioning fixture cannot complete the tensioning and depressurizing process. The second one-way valve can realize the tensioning pressure reduction and pressure stabilization function.

7. The ultra-high pressure stabilizing and regulating system for gear press-fitting process according to claim 6, characterized in that, When the pressure regulating valve is adjusted to reduce pressure, when the difference between the pump outlet pressure and the pressure inside the tensioning fixture is greater than the set opening pressure of the second check valve, the oil inside the tensioning fixture is discharged to the pump outlet through the second check valve. When the pressure of the pressure regulating valve fluctuates, when the pressure regulating pressure fluctuates upward so that the difference between the pump outlet pressure and the pressure inside the tensioning fixture is less than the opening pressure of the second check valve, the pressure in the tensioning chamber remains unchanged, which can effectively stabilize the pressure in the tensioning chamber. When the pressure value fed back by the first pressure sensor reaches the set pressure in the tensioning chamber, the pressure in the tensioning chamber detected by the second pressure sensor will be greater than the value of the first pressure sensor. Therefore, when controlling the tensioning and depressurization, the final pressure of the pressure regulating valve needs to be set to be a certain value lower than the final pressure inside the required tensioning fixture, and the feedback value of the second pressure sensor is used to determine whether the tensioning pressure has reached the set pressure. When the pressure of the pressure regulating valve is reduced to zero, the tensioning fixture will still be locked at a certain pressure by the second one-way valve. The tensioning pressure can be completely released by energizing the unloading valve.

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