Gear press mounting process with ultra-high pressure proportional regulating system and control method

Abstract

The application discloses a kind of superhigh pressure proportional adjusting system and control method for gear press mounting process, including motor, superhigh pressure plunger pump, oil tank, two safety valves, three electromagnetic stop valves, two pressure sensors, three throttle dampings, proportional overflow valve and electromagnetic pressure maintaining valve;When oil only returns through proportional overflow valve, overflow pressure of proportional overflow valve is controlled, linear pressure loading and pressure relief of tensioning tool in 0-70MPa are realized;When oil returns through throttle damping and proportional overflow valve simultaneously, according to the number of different throttle dampings passed, overflow pressure of proportional overflow valve is controlled, linear pressure loading and pressure relief of tensioning tool in 70-120, 120-170, 170-200MPa are realized.The application can realize the segmented regulation of 200MPa hydraulic system loading pressure, and can control the tensioning pressure in 0-200MPa pressure rise amplitude and pressure rise slope.

Description

Technical Field

[0001] The present invention relates to the field of ultra-high pressure hydraulic transmission, and in particular to an ultra-high pressure proportional adjustment system and a control method for a gear press-fitting process. Background Art

[0002] The gear press-fitting process requires ultra-high-pressure hydraulic oil to enter the tensioner, causing it to expand or release pressure. To ensure control accuracy during the press-fitting process, it is necessary to be able to adjust and control the pressure increase and release values ​​of the tensioner, as well as the time of pressure change. A proportional relief valve can control the pressure of the ultra-high-pressure system, but the maximum pressure in the tensioner can reach 200 MPa. Currently, the maximum adjustable pressure of the proportional relief valve is only 70 MPa, making it difficult to linearly increase or decrease pressures above 70 MPa. Summary of the Invention

[0003] In response to the deficiencies of the prior art, the present invention provides an ultra-high pressure proportional regulation system and control method for a gear press-fitting process, which can achieve linear adjustment of the pressure increase / decompression within the tensioning tooling of the gear press-fitting process within the range of 0-200MPa.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] An ultra-high pressure proportional control system for a gear press-fitting process includes a motor, an ultra-high pressure plunger pump, an oil tank, a first safety valve, a first electromagnetic stop valve, a second electromagnetic stop valve, a third electromagnetic stop valve, a second safety valve, a first pressure sensor, a first throttle damper, a second throttle damper, a third throttle damper, a proportional relief valve, an electromagnetic pressure maintaining valve, and a second pressure sensor;

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

[0007] The inlet of the first safety valve is connected to the outlet of the ultra-high pressure plunger pump, and the outlet is connected to the oil tank; the first pressure sensor is connected to the outlet oil line of the ultra-high pressure plunger pump to feedback the pressure of the ultra-high pressure proportional regulation system;

[0008] The inlets of the first electromagnetic stop valve and the first throttle damper are both connected to the outlet oil circuit of the ultra-high pressure plunger pump, and the outlets of the first electromagnetic stop valve and the first throttle damper are both connected to the inlets of the second throttle damper and the second electromagnetic stop valve; the outlets of the second throttle damper and the second electromagnetic stop valve are both connected to the inlets of the third throttle damper and the third electromagnetic stop valve, and the outlets of the third throttle damper and the third electromagnetic stop valve are both connected to the inlets of the proportional relief valve and the second safety valve, and the outlets of the proportional relief valve and the second safety valve are both connected to the oil tank;

[0009] The two oil ports of the electromagnetic pressure-maintaining valve are respectively connected to the outlet oil circuit of the ultra-high-pressure plunger pump and the oil inlet of the tensioning tooling in the gear press-fitting process;

[0010] The second pressure sensor is connected to the oil inlet circuit of the tensioning fixture and is used to feed back the oil pressure in the tensioning fixture.

[0011] Furthermore, the first safety valve and the second safety valve are both manual relief valve structures.

[0012] Furthermore, the first electromagnetic stop valve, the second electromagnetic stop valve and the third electromagnetic stop valve are all normally open structures.

[0013] Furthermore, the first throttling damping, the second throttling damping and the third throttling damping are all fixed opening damping, and the pressure difference generated by a single throttling damping is 50 MPa.

[0014] Furthermore, the pressure ratio of the proportional relief valve is adjustable in a range of 0-70 MPa.

[0015] Furthermore, the pressure of the second safety valve is set to 70 MPa, so as to protect the inlet pressure of the proportional relief valve from not exceeding 70 MPa; the pressure of the first safety valve is set to 210 MPa.

[0016] Furthermore, the electromagnetic pressure-maintaining valve is a normally-off structure, and the valve core is a cone valve structure, which can lock the high-pressure side pressure in the power-off state.

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

[0018] A control method for an ultra-high pressure proportional regulation system for a gear press-fitting process is disclosed. The pressure control of 0-200 MPa within the tensioning tooling during the gear press-fitting process is divided into four stages: 0-70 MPa, 70-120 MPa, 120-170 MPa, and 170-200 MPa. The details are as follows:

[0019] The 0-70MPa pressurization control process is as follows: the first electromagnetic stop valve, the second electromagnetic stop valve, the third electromagnetic stop valve, and the electromagnetic pressure maintaining valve are all in the on state, the motor rotates to drive the ultra-high pressure plunger pump to discharge hydraulic oil, and the oil quickly fills the tensioning tooling through the electromagnetic pressure maintaining valve. After the oil filling is completed, the tensioning tooling becomes a closed cavity, and the tensioning pressure is consistent with the system pressure; the oil returns to the oil tank through the first electromagnetic stop valve, the second electromagnetic stop valve, the third electromagnetic stop valve, and the proportional relief valve; by adjusting the current of the proportional relief valve, the pressure of the ultra-high pressure proportional regulation system is controlled to rise; by adjusting the slope of the current increase, the pressure rise curve of the oil in the tensioning tooling is controlled;

[0020] The 70-120 MPa pressurization control process is as follows: the first solenoid stop valve is in the disconnected state, the second solenoid stop valve, the third solenoid stop valve, and the solenoid pressure-maintaining valve are all in the connected state, the motor rotates to drive the ultra-high-pressure plunger pump to discharge hydraulic oil, and the oil returns to the oil tank through the first throttle damper, the second solenoid stop valve, the third solenoid stop valve, and the proportional relief valve; the outlet pressure of the first throttle damper is controlled by the proportional relief valve, and the oil flows through the first throttle damper to generate a 50 MPa pressure difference. By adjusting the pressure of the proportional relief valve within the range of 20-70 MPa, the tensioning pressure in the tensioning tool is controlled to be pressurized within the range of 70-120 MPa; the pressure rise curve of the oil in the tensioning tool is controlled by adjusting the slope of the current change;

[0021] The pressurization control process of 120-170 MPa is as follows: the first electromagnetic stop valve and the second electromagnetic stop valve are in the disconnected state, the third electromagnetic stop valve and the electromagnetic pressure maintaining valve are both in the connected state, the motor rotates to drive the ultra-high pressure plunger pump to discharge hydraulic oil, and the oil returns to the oil tank through the first throttle damper, the second throttle damper, the third electromagnetic stop valve, and the proportional relief valve; the outlet pressure of the second throttle damper is controlled by the proportional relief valve, and the oil flows through the first throttle damper and the second throttle damper to generate a pressure difference of 100 MPa. By adjusting the pressure of the proportional relief valve within the range of 20-70 MPa, the tensioning pressure in the tensioning tool is controlled to be pressurized within the range of 120-170 MPa; by adjusting the slope of the current change, the pressure rise curve of the oil in the tensioning tool is controlled;

[0022] The pressurization control process of 170-200 MPa is as follows: the first electromagnetic stop valve, the second electromagnetic stop valve, and the third electromagnetic stop valve are all in the disconnected state, the electromagnetic pressure maintaining valves are all in the connected state, the motor rotates to drive the ultra-high-pressure plunger pump to discharge hydraulic oil, and the oil returns to the oil tank through the first throttle damper, the second throttle damper, the third throttle damper, and the proportional relief valve; the outlet pressure of the third throttle damper is controlled by the proportional relief valve, and the oil flows through the first throttle damper, the second throttle damper, and the third throttle damper to generate a total pressure difference of 150 MPa. By adjusting the pressure of the proportional relief valve within 20-50 MPa, the tensioning pressure in the tensioning tool is controlled to be pressurized within the range of 170-200 MPa; and the pressure rise curve of the oil in the tensioning tool is controlled by adjusting the slope of the current change.

[0023] During the entire pressurizing process, the tensioning pressure in the tensioning tool is accurately controlled through the pressure feedback of the second pressure sensor.

[0024] Further, the pressure reduction control in the 200~0MPa range in the gear press-fitting process is divided into four stages: 200-170Mpa, 170-120Mpa, 120-70Mpa, and 70-0Mpa, and the details are as follows:

[0025] The pressure reduction control process in the 200-170Mpa range is as follows: the first electromagnetic cut-off valve, the second electromagnetic cut-off valve, and the third electromagnetic cut-off valve are all in the off state, the electromagnetic pressure maintaining valves are all in the on state, the motor rotates to drive the super-high pressure plunger pump to discharge hydraulic oil, the oil is returned to the oil tank through the first throttling damper, the second throttling damper, the third throttling damper, and the proportional overflow valve; the outlet pressure of the third throttling damper is controlled by the proportional overflow valve, the oil flows through the first throttling damper, the second throttling damper, and the third throttling damper to generate a total pressure difference of 150MPa, the pressure of the proportional overflow valve is adjusted to change in the range of 50-20MPa, and the pressure in the tightening tool is controlled to reduce in the range of 200-170Mpa; the slope of the current change is adjusted to control the pressure drop curve of the oil in the tightening tool;

[0026] The pressure reduction control process in the 170-120Mpa range is as follows: the first electromagnetic cut-off valve and the second electromagnetic cut-off valve are in the off state, the third electromagnetic cut-off valve and the electromagnetic pressure maintaining valve are in the on state, the motor rotates to drive the super-high pressure plunger pump to discharge hydraulic oil, the oil is returned to the oil tank through the first throttling damper, the second throttling damper, the third electromagnetic cut-off valve (7), and the proportional overflow valve; the outlet pressure of the second throttling damper is controlled by the proportional overflow valve, the oil flows through the first throttling damper and the second throttling damper to generate a pressure difference of 100MPa, the pressure of the proportional overflow valve is adjusted to change in the range of 70-20MPa, and the pressure in the tightening tool is controlled to reduce in the range of 170-120Mpa; the slope of the current change is adjusted to control the pressure drop curve of the oil in the tightening tool;

[0027] The pressure reduction control process in the 120-70Mpa range is as follows: the first electromagnetic cut-off valve is in the off state, the second electromagnetic cut-off valve, the third electromagnetic cut-off valve, and the electromagnetic pressure maintaining valve are in the on state, the motor rotates to drive the super-high pressure plunger pump to discharge hydraulic oil, the oil is returned to the oil tank through the first throttling damper, the second electromagnetic cut-off valve, the third electromagnetic cut-off valve, and the proportional overflow valve; the outlet pressure of the first throttling damper is controlled by the proportional overflow valve, the oil flows through the first throttling damper to generate a pressure difference of 50MPa, the pressure of the proportional overflow valve is adjusted to change in the range of 70-20MPa, and the pressure in the tightening tool is controlled to reduce in the range of 120-70Mpa; the slope of the current change is adjusted to control the pressure drop curve of the oil in the tightening tool;

[0028] The 70-0 MPa pressure reduction control process is as follows: the first electromagnetic stop valve, the second electromagnetic stop valve, the third electromagnetic stop valve, and the electromagnetic pressure maintaining valve are all in the on state, the motor rotates to drive the ultra-high pressure plunger pump to discharge hydraulic oil, and the oil is quickly filled into the tightening tooling through the electromagnetic pressure maintaining valve. After the oil filling is completed, the tightening tooling becomes a closed cavity, and the tightening pressure is consistent with the system pressure; the oil returns to the oil tank through the first electromagnetic stop valve, the second electromagnetic stop valve, the third electromagnetic stop valve, and the proportional relief valve; by adjusting the current of the proportional relief valve to reduce, the pressure drop of the ultra-high pressure proportional regulation system is controlled; by adjusting the slope of the current reduction, the pressure drop curve of the oil in the tightening tooling is controlled;

[0029] During the entire decompression control process, the tensioning pressure in the tensioning tool is accurately controlled through the pressure feedback of the second pressure sensor.

[0030] The beneficial effects of the present invention are as follows:

[0031] 1. The present invention can be used in 200MPa-level ultra-high-pressure hydraulic systems to achieve segmented adjustment of loading pressure.

[0032] 2. The present invention can control the pressure increase amplitude and pressure increase slope of the tightening pressure in the range of 0-200MPa.

[0033] 3. The present invention can control the pressure reduction amplitude and pressure reduction curve of the tensioning pressure in the range of 200-0 MPa. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of an ultra-high pressure proportional regulation system for a gear press-fitting process according to an embodiment of the present invention.

[0035] Figure 2 This is a diagram of the oil circuit for controlling the internal pressure of the tensioning tooling of an embodiment of the present invention, which is 0-70 MPa pressurization / 70-0 MPa decompression.

[0036] Figure 3 This is a state switching oil circuit diagram when the tightening pressure increases to 70 MPa or decreases to 120 MPa in an embodiment of the present invention.

[0037] Figure 4 This is a diagram of the oil circuit for controlling the internal pressure of the tensioning fixture to be 70-120 MPa pressurized / 120-70 MPa depressurized in an embodiment of the present invention.

[0038] Figure 5 This is an oil circuit diagram for switching between the tightening pressure rising to 120 MPa and falling to 170 MPa in an embodiment of the present invention.

[0039] Figure 6This is a diagram of the oil circuit for controlling the internal pressure of the tensioning tooling of an embodiment of the present invention, which is 120-170 MPa pressurization / 170-120 MPa decompression.

[0040] Figure 7 This is a diagram of the oil circuit for switching when the tightening pressure rises to 170 MPa in an embodiment of the present invention.

[0041] Figure 8 This is a diagram of the oil circuit for controlling the internal pressure of the tensioning fixture to be 170-200 MPa pressurized / 200-170 MPa decompressed in an embodiment of the present invention.

[0042] Figure 9 This is a diagram of the oil circuit for switching when the pressure inside the tensioning fixture drops to 70 MPa according to an embodiment of the present invention.

[0043] In the figure, 1 is the motor, 2 is the ultra-high pressure plunger pump, 3 is the oil tank, 4 is the first safety valve, 5 is the first solenoid stop valve, 6 is the second solenoid stop valve, 7 is the third solenoid stop valve, 8 is the second safety valve, 9 is the first pressure sensor, 10 is the first throttle damper, 11 is the second throttle damper, 12 is the third throttle damper, 13 is the proportional overflow valve, 14 is the solenoid pressure maintaining valve, 15 is the second pressure sensor, and 16 is the tensioning fixture. DETAILED DESCRIPTION

[0044] The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments, and the purpose and effects of the present invention will become more apparent. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0045] like Figure 1 As shown, the ultra-high pressure proportional regulation system for the gear pressing process of this embodiment includes a motor 1, an ultra-high pressure plunger pump 2, an oil tank 3, a first safety valve 4, a first electromagnetic stop valve 5, a second electromagnetic stop valve 6, a third electromagnetic stop valve 7, a second safety valve 8, a first pressure sensor 9, a first throttle damper 10, a second throttle damper 11, a third throttle damper 12, a proportional overflow valve 13, an electromagnetic pressure maintaining valve 14 and a second pressure sensor 15.

[0046] Motor 1 drives ultra-high-pressure plunger pump 2 to rotate and discharge hydraulic oil. Ultra-high-pressure plunger pump 2 is a radial plunger pump with a maximum output pressure greater than 200 MPa. Ultra-high-pressure plunger pump 2 draws oil from oil tank 3, and all return oil in the system returns to oil tank 3.

[0047] The inlet of the first safety valve 4 is connected to the outlet of the ultra-high-pressure plunger pump 2 and is a manual relief valve with a pressure setting of 210 MPa. The inlet of the first solenoid stop valve 5 is connected to the outlet oil circuit of the ultra-high-pressure plunger pump 2 and is a normally open structure. The inlet of the second solenoid stop valve 6 is connected to the outlet of the first solenoid stop valve 5 and is also a normally open structure. The inlet of the third solenoid stop valve 7 is connected to the outlet of the second solenoid stop valve 6 and is also a normally open structure. The inlet of the second safety valve 8 is connected to the outlet of the third solenoid stop valve 7 and is a manual relief valve.

[0048] The first pressure sensor 9 is connected to the outlet oil line of the ultra-high pressure plunger pump 2 and is used to feedback the ultra-high pressure system pressure.

[0049] The first throttle damper 10 is a fixed-opening damper, with its inlet connected to the outlet oil circuit of the ultra-high-pressure plunger pump 2 and its outlet connected to the outlet of the first solenoid shut-off valve 5. The second throttle damper 11 is a fixed-opening damper, with its inlet connected to the outlet of the first throttle damper 10 and its outlet connected to the outlet of the second solenoid shut-off valve 6. The third throttle damper 12 is a fixed-opening damper, with its inlet connected to the outlet of the second throttle damper 11 and its outlet connected to the outlet of the third solenoid shut-off valve 7. A pressure differential of 50 MPa is generated between the inlets and outlets of the first, second, and third throttle dampers 10, 11, and 12.

[0050] The inlet of the proportional relief valve 13 is connected to the outlet of the third throttle damper 12, and the outlet is connected to the oil tank 3. The pressure proportional adjustable range of the relief valve is 0-70MPa, and the pressure of the second safety valve 8 is set to 70Mpa, which is used to protect the inlet pressure of the proportional relief valve 13 from exceeding 70MPa.

[0051] The two oil ports of the electromagnetic pressure maintaining valve 14 are respectively connected to the outlet oil circuit of the ultra-high pressure plunger pump 2 and the oil inlet of the tightening tooling 16. It is a normally-off structure, and the valve core is a cone valve structure, which can lock the high-pressure side pressure in the power-off state.

[0052] The second pressure sensor 15 is connected to the oil inlet circuit of the tensioning fixture 16 to provide feedback on the oil pressure in the tensioning fixture.

[0053] The cavity of the tensioning fixture 16 is a closed cavity, and its oil inlet and oil outlet are the same oil port.

[0054] The pressure control process of the tensioning tooling with a pressure of 0-200MPa is as follows:

[0055] like Figure 2As shown, the pressure control process of the tensioning tool is as follows: the first electromagnetic cut-off valve 5, the second electromagnetic cut-off valve 6 and the third electromagnetic cut-off valve 7 are kept in the power-off state, and the electromagnetic pressure maintaining valve 14 is in the power-on state. The motor 1 rotates to drive the super-high pressure plunger pump 2 to discharge hydraulic oil, the oil is quickly filled into the tensioning tool 16 through the electromagnetic pressure maintaining valve 14, and the tensioning tool 16 becomes a closed cavity after the filling of the oil is completed, so that the tensioning pressure is consistent with the system pressure, the oil is returned to the oil tank 3 through the first electromagnetic cut-off valve 5, the second electromagnetic cut-off valve 6, the third electromagnetic cut-off valve 7 and the proportional overflow valve 13, the super-high pressure system pressure is increased by increasing the current of the overflow valve 13, the pressure rising curve of the oil in the tensioning tool 1 is controlled by adjusting the slope of the current increase, and the tensioning pressure is accurately controlled through the pressure feedback of the second pressure sensor 15. When the pressure feedback of the second pressure sensor 15 reaches 70 MPa, the pressure control is completed.

[0056] As shown in Figure 3 When the tensioning pressure rises to 70 MPa, the state is switched as follows: the electromagnetic pressure maintaining valve 14 is in the power-off state, the current of the proportional overflow valve 13 is adjusted to 0, the outlet pressure of the super-high pressure plunger pump is reduced to 0 MPa, and the pressure in the tensioning tool 16 is still kept at 70 MPa due to the pressure maintaining effect of the electromagnetic pressure maintaining valve 14, the first electromagnetic cut-off valve 5 is in the power-on state, the oil at the pump outlet is returned to the oil tank through the first throttling damper 10, the second electromagnetic cut-off valve 6, the third electromagnetic cut-off valve 7 and the proportional overflow valve 13, a pressure difference of 50 MPa is generated on the first throttling damper 10, the pump outlet pressure is 50 MPa, the current of the proportional overflow valve 13 is increased, and when the pressure feedback of the first pressure sensor 9 reaches 70 MPa, the pressure switching state is completed.

[0057] As shown in Figure 4 The pressure control process of the tensioning tool is as follows: the first electromagnetic cut-off valve 5 and the electromagnetic pressure maintaining valve 14 are in the power-on state, and the second electromagnetic cut-off valve 6 and the third electromagnetic cut-off valve 7 are kept in the power-off state. The oil discharged by the super-high pressure plunger pump 2 is returned to the oil tank through the first throttling damper 10, the second electromagnetic cut-off valve 6, the third electromagnetic cut-off valve 7 and the proportional overflow valve 13, the outlet pressure of the first throttling damper 10 is controlled by the proportional overflow valve 13, a pressure difference of 50 MPa is generated when the oil flows through the first throttling damper 10, the tensioning pressure is increased from 70 MPa to 120 MPa by adjusting the pressure of the proportional overflow valve 13 to rise from 20 MPa to 70 MPa, the pressure rising curve of the oil in the tensioning tool 16 is controlled by adjusting the slope of the current increase, and the tensioning pressure is accurately controlled through the pressure feedback of the second pressure sensor 15. When the pressure feedback of the second pressure sensor 15 reaches 120 MPa, the pressure control is completed.

[0058] As shown in Figure 5As shown, when the tightening pressure rises to 120 MPa, the state switches to: the electromagnetic pressure-maintaining valve 14 loses power, the current of the proportional relief valve 13 is adjusted to 0, and the outlet pressure of the ultra-high-pressure plunger pump drops to 50 MPa. Due to the pressure-maintaining effect of the electromagnetic pressure-maintaining valve 14, the pressure in the tightening tooling 16 is still maintained at 120 MPa. The first electromagnetic stop valve 5 and the second electromagnetic stop valve 6 are energized, and the oil at the pump outlet returns through the first throttle damper 10, the second throttle damper 11, the third electromagnetic stop valve 7, and the proportional relief valve 13. The oil generates a pressure difference of 50 MPa on the first throttle damper 10 and the second throttle damper 11 respectively. The pump outlet pressure is 100 MPa, and the current of the proportional relief valve 13 is controlled to increase. When the feedback pressure of the first pressure sensor 9 reaches 120 MPa, the pressurization switching state is completed.

[0059] like Figure 6 As shown, the process for controlling the pressure within the tensioner 16 to 120-170 MPa is as follows: the first solenoid shut-off valve 5, the second solenoid shut-off valve 6, and the solenoid pressure-maintaining valve 14 are energized, while the third solenoid shut-off valve 7 is de-energized. The ultra-high-pressure plunger pump 2 discharges oil back to the tank through the first throttle damper 10, the second throttle damper 11, the third solenoid shut-off valve 7, and the proportional relief valve 13. The outlet pressure of the second throttle damper 11 is controlled by the proportional relief valve 13. The oil flowing through the two throttle dampers generates a pressure differential of 100 MPa. By adjusting the pressure of the proportional relief valve 13 within a range of 20-70 MPa, the tensioning pressure can be controlled to increase from 120-170 MPa. Adjusting the slope of the current increase controls the pressure rise curve within the tensioner 16. Pressure feedback from the second pressure sensor 15 allows for precise control of the tensioning pressure. When the pressure feedback from the second pressure sensor 15 reaches 170 MPa, the pressure increase is complete.

[0060] like Figure 7 As shown, when the tightening pressure rises to 170 MPa, the state switches to the following: the electromagnetic pressure-maintaining valve 14 loses power, the current of the proportional relief valve 13 is adjusted to 0, and the outlet pressure of the ultra-high-pressure plunger pump drops to 100 MPa. Due to the pressure-maintaining effect of the electromagnetic pressure-maintaining valve 14, the pressure in the tightening tooling 16 remains at 170 MPa. The first electromagnetic stop valve 5, the second electromagnetic stop valve 6, and the third electromagnetic stop valve 7 are energized, and the oil at the pump outlet returns through the first throttle damper 10, the second throttle damper 11, the third throttle damper 12, and the proportional relief valve 13. The oil generates a pressure difference of 50 MPa on the first throttle damper 10, the second throttle damper 11, and the third throttle damper 12, respectively. The pump outlet pressure is 150 MPa, and the current of the proportional relief valve 13 is controlled to increase. When the feedback pressure of the first pressure sensor 9 reaches 170 MPa, the pressurization switching state is completed.

[0061] like Figure 8As shown, the process for controlling the pressure within the tensioner to 170-200 MPa is as follows: the first solenoid shut-off valve 5, the second solenoid shut-off valve 6, the third solenoid shut-off valve 7, and the solenoid pressure-maintaining valve 14 are energized. The ultra-high-pressure plunger pump 2 discharges oil through the first throttle damper 10, the second throttle damper 11, the third throttle damper 12, and the proportional relief valve 13, returning the oil to the oil tank 3. The outlet pressure of the third throttle damper 12 is controlled by the proportional relief valve 13. The oil flowing through the three throttle dampers generates a pressure differential of 150 MPa. By adjusting the pressure of the proportional relief valve 13 within a range of 20-50 MPa, the tensioning pressure can be controlled to 170-200 MPa. Adjusting the slope of the current increase controls the pressure rise curve of the oil within the tensioner 16. Pressure feedback from the second pressure sensor 15 allows for precise control of the tensioning pressure.

[0062] The pressure control process of the tensioning tooling with a pressure of 200-0MPa is as follows:

[0063] like Figure 8 As shown, the pressure reduction control process for the tensioner fixture (200-170 MPa) is as follows: the first solenoid shut-off valve 5, the second solenoid shut-off valve 6, the third solenoid shut-off valve 7, and the solenoid pressure-maintaining valve 14 are energized. The ultra-high-pressure plunger pump 2 discharges oil through the first throttle damper 10, the second throttle damper 11, the third throttle damper 12, and the proportional relief valve 13, returning the oil to the tank. The oil flowing through the three throttle dampers generates a pressure differential of 150 MPa. By adjusting the pressure drop of the proportional relief valve 13 between 50 and 20 MPa, the tensioning pressure can be reduced from 200 to 170 MPa. Adjusting the slope of the current drop controls the pressure drop curve of the oil inside the tensioner fixture 16. Pressure feedback from the second pressure sensor 15 allows precise control of the tensioning pressure. Pressure reduction control is complete when the pressure feedback from the second pressure sensor 15 drops to 170 MPa.

[0064] like Figure 5 As shown, when the tightening pressure drops to 170 MPa, the state switches to: the electromagnetic pressure maintaining valve 14 and the third electromagnetic stop valve 7 lose power, the first electromagnetic stop valve 5 and the second electromagnetic stop valve 6 remain energized, the current of the proportional relief valve 13 remains unchanged, and the oil flowing through the first throttle damper 10 and the second throttle damper 11 will generate a pressure difference of 100 MPa. Combined with the 20 MPa pressure difference maintained by the current of the proportional relief valve 13, the outlet pressure of the ultra-high pressure plunger pump drops to 120 MPa, and the current of the proportional relief valve 13 is controlled to increase. When the feedback pressure of the first pressure sensor 9 reaches 170 MPa, the pressure reduction switching state is completed.

[0065] like Figure 6As shown, the pressure reduction control process for the tensioner fixture (170-120 MPa) is as follows: the first solenoid shut-off valve 5, the second solenoid shut-off valve 6, and the solenoid pressure-maintaining valve 14 are energized, while the third solenoid shut-off valve 7 is de-energized. The ultra-high-pressure plunger pump 2 discharges oil through the first throttle damper 10, the second throttle damper 11, the third solenoid shut-off valve 7, and the proportional relief valve 13, returning the oil to the tank. The oil flowing through the first and second throttle dampers 10 and 11 generates a pressure differential of 100 MPa. By adjusting the pressure drop of the proportional relief valve 13 between 70 and 20 MPa, the tensioning pressure can be reduced from 170 to 120 MPa. Adjusting the slope of the current drop controls the pressure drop curve of the oil inside the tensioner fixture 16. Pressure feedback from the second pressure sensor 15 allows for precise control of the tensioning pressure. Pressure reduction control is complete when the pressure feedback from the second pressure sensor 15 drops to 120 MPa.

[0066] like Figure 3 As shown, when the tightening pressure drops to 120 MPa, the state switches to: the electromagnetic pressure maintaining valve 14, the second electromagnetic stop valve 6, and the third electromagnetic stop valve 7 lose power, the first electromagnetic stop valve 5 remains energized, the current of the proportional relief valve 13 remains unchanged, and the oil flowing through the first throttle damper 10 will generate a pressure difference of 50 MPa. Combined with the 20 MPa pressure difference maintained by the current of the proportional relief valve 13, the outlet pressure of the ultra-high pressure plunger pump drops to 70 MPa. Due to the pressure maintaining effect of the electromagnetic pressure maintaining valve 14, the pressure in the tightening tooling 16 is still maintained at 120 MPa, and the current of the proportional relief valve 13 is controlled to increase. When the feedback pressure of the first pressure sensor 9 reaches 120 MPa, the pressure reduction switching state is completed.

[0067] like Figure 4 As shown, the pressure reduction control process for the tensioner fixture (120-70 MPa) is as follows: the first solenoid shut-off valve 5 and the solenoid pressure-maintaining valve 14 are energized, while the second and third solenoid shut-off valves 6 and 7 remain de-energized. The oil discharged from the ultra-high-pressure plunger pump 2 returns to the tank through the first throttle damper 10, the second solenoid shut-off valve 6, the third solenoid shut-off valve 7, and the proportional relief valve 13. The oil flowing through the first throttle damper 10 generates a 50 MPa pressure differential. By adjusting the pressure drop of the proportional relief valve 13 between 70 and 20 MPa, the tensioning pressure can be controlled from 120 to 70 MPa. Adjusting the slope of the current drop controls the pressure drop curve of the oil inside the tensioner fixture 16. Pressure feedback from the second pressure sensor 15 allows for precise control of the tensioning pressure. Pressure reduction control is complete when the pressure feedback from the second pressure sensor 15 drops to 70 MPa.

[0068] like Figure 9As shown, when the tightening pressure drops to 70 MPa, the state switches to: the electromagnetic pressure maintaining valve 14, the first electromagnetic stop valve 5, the second electromagnetic stop valve 6, and the third electromagnetic stop valve 7 lose power, the current of the proportional relief valve 13 remains unchanged, and the oil flows through the proportional relief valve 13. Due to the 20 MPa pressure difference maintained by the current of the proportional relief valve 13, the outlet pressure of the ultra-high pressure plunger pump drops to 20 MPa. Due to the pressure maintaining effect of the electromagnetic pressure maintaining valve 14, the pressure in the tightening tooling 16 is still maintained at 70 MPa. The current of the proportional relief valve 13 is controlled to increase. When the feedback pressure of the first pressure sensor 9 reaches 70 MPa, the pressure reduction switching state is completed.

[0069] like Figure 2 As shown, the pressure reduction control process for the tensioner 1 from 70 MPa to 0 MPa is as follows: the first, second, and third solenoid shut-off valves 5, 6, and 7 remain de-energized, while the solenoid pressure-maintaining valve 14 remains energized. The ultra-high-pressure plunger pump 2 discharges oil, which is then returned to the oil tank 3 through the first, second, and third solenoid shut-off valves 5, 6, and 7, along with the proportional relief valve 13. The ultra-high-pressure system pressure drop is controlled by reducing the current flowing through the relief valve 13. Adjusting the slope of the current reduction modifies the pressure drop curve of the oil within the tensioner 1. Pressure feedback from the second pressure sensor 15 allows for precise control of the tensioning pressure. Pressure reduction control is complete when the pressure feedback from the second pressure sensor 15 drops to 0 MPa.

[0070] During the entire pressurization / depressurization process, the speed of the motor 1 remains unchanged, so that the oil discharge volume of the ultra-high pressure plunger pump 2 remains unchanged. Only by switching the various valves and adjusting the current of the proportional relief valve 13 can the precise linear adjustment of the pressure in the tightening tooling be achieved.

[0071] Those skilled in the art will understand that the foregoing descriptions are merely preferred embodiments 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 will still be able to modify the technical solutions described in the foregoing examples or substitute equivalents for some of the technical features therein. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the invention shall be included within the scope of protection of the invention.

Claims

1. An ultra-high pressure proportional control system for a gear press-fitting process, characterized in that: It includes a motor, an ultra-high pressure plunger pump, a fuel tank, a first safety valve, a first electromagnetic stop valve, a second electromagnetic stop valve, a third electromagnetic stop valve, a second safety valve, a first pressure sensor, a first throttle damper, a second throttle damper, a third throttle damper, a proportional relief valve, an electromagnetic pressure maintaining valve and a second pressure sensor; The motor drives the ultra-high pressure plunger pump to rotate and discharge hydraulic oil; The inlet of the first safety valve is connected to the outlet of the ultra-high pressure plunger pump, and the outlet is connected to the oil tank; the first pressure sensor is connected to the outlet oil line of the ultra-high pressure plunger pump to feedback the pressure of the ultra-high pressure proportional regulation system; The inlets of the first electromagnetic stop valve and the first throttle damper are both connected to the outlet oil circuit of the ultra-high pressure plunger pump, and the outlets of the first electromagnetic stop valve and the first throttle damper are both connected to the inlets of the second throttle damper and the second electromagnetic stop valve; the outlets of the second throttle damper and the second electromagnetic stop valve are both connected to the inlets of the third throttle damper and the third electromagnetic stop valve, and the outlets of the third throttle damper and the third electromagnetic stop valve are both connected to the inlets of the proportional relief valve and the second safety valve, and the outlets of the proportional relief valve and the second safety valve are both connected to the oil tank; The two oil ports of the electromagnetic pressure-maintaining valve are respectively connected to the outlet oil circuit of the ultra-high-pressure plunger pump and the oil inlet of the tensioning tooling in the gear press-fitting process; The second pressure sensor is connected to the oil inlet circuit of the tensioning fixture and is used to feed back the oil pressure in the tensioning fixture.

2. The ultra-high pressure proportional adjustment system for gear press-fitting process according to claim 1, characterized in that: The first safety valve and the second safety valve are both manual relief valve structures.

3. The ultra-high pressure proportional adjustment system for gear press-fitting process according to claim 1, characterized in that: The first electromagnetic stop valve, the second electromagnetic stop valve and the third electromagnetic stop valve are all normally open structures.

4. The ultra-high pressure proportional adjustment system for gear press-fitting process according to claim 1, characterized in that: The first throttling damping, the second throttling damping and the third throttling damping are all fixed opening dampings, and the pressure difference generated by a single throttling damping is 50 MPa.

5. The ultra-high pressure proportional adjustment system for gear press-fitting process according to claim 1, characterized in that: The pressure ratio of the proportional relief valve is adjustable in the range of 0-70 MPa.

6. The ultra-high pressure proportional adjustment system for the gear press-fitting process according to claim 5, characterized in that: The pressure of the second safety valve is set to 70 MPa to protect the inlet pressure of the proportional relief valve from not exceeding 70 MPa; the pressure of the first safety valve is set to 210 MPa.

7. The ultra-high pressure proportional adjustment system for gear press-fitting process according to claim 1, characterized in that: The electromagnetic pressure maintaining valve is of a normally-off structure, and the valve core is a cone valve structure, which can lock the high-pressure side pressure in the power-off state.

8. The ultra-high pressure proportional adjustment system for gear press-fitting process according to claim 1, characterized in that: The ultra-high pressure plunger pump is a radial plunger pump with a maximum output pressure greater than 200 MPa.

9. A control method for an ultra-high pressure proportional regulation system for a gear press-fitting process according to claim 1, characterized in that: The pressure control of 0~200MPa in the tensioning tooling during the gear press-fitting process is divided into four stages: 0-70Mpa, 70-120Mpa, 120-170Mpa and 170-200Mpa, as follows: The 0-70MPa pressurization control process is as follows: the first electromagnetic stop valve, the second electromagnetic stop valve, the third electromagnetic stop valve, and the electromagnetic pressure maintaining valve are all in the on state, the motor rotates to drive the ultra-high pressure plunger pump to discharge hydraulic oil, and the oil quickly fills the tensioning tooling through the electromagnetic pressure maintaining valve. After the oil filling is completed, the tensioning tooling becomes a closed cavity, and the tensioning pressure is consistent with the system pressure; the oil returns to the oil tank through the first electromagnetic stop valve, the second electromagnetic stop valve, the third electromagnetic stop valve, and the proportional relief valve; by adjusting the current of the proportional relief valve, the pressure of the ultra-high pressure proportional regulation system is controlled to rise; by adjusting the slope of the current increase, the pressure rise curve of the oil in the tensioning tooling is controlled; The 70-120 MPa pressurization control process is as follows: the first solenoid stop valve is in the disconnected state, the second solenoid stop valve, the third solenoid stop valve, and the solenoid pressure-maintaining valve are all in the connected state, the motor rotates to drive the ultra-high-pressure plunger pump to discharge hydraulic oil, and the oil returns to the oil tank through the first throttle damper, the second solenoid stop valve, the third solenoid stop valve, and the proportional relief valve; the outlet pressure of the first throttle damper is controlled by the proportional relief valve, and the oil flows through the first throttle damper to generate a 50 MPa pressure difference. By adjusting the pressure of the proportional relief valve within the range of 20-70 MPa, the tensioning pressure in the tensioning tool is controlled to be pressurized within the range of 70-120 MPa; the pressure rise curve of the oil in the tensioning tool is controlled by adjusting the slope of the current change; The pressurization control process of 120-170 MPa is as follows: the first electromagnetic stop valve and the second electromagnetic stop valve are in the disconnected state, the third electromagnetic stop valve and the electromagnetic pressure maintaining valve are both in the connected state, the motor rotates to drive the ultra-high pressure plunger pump to discharge hydraulic oil, and the oil returns to the oil tank through the first throttle damper, the second throttle damper, the third electromagnetic stop valve, and the proportional relief valve; the outlet pressure of the second throttle damper is controlled by the proportional relief valve, and the oil flows through the first throttle damper and the second throttle damper to generate a pressure difference of 100 MPa. By adjusting the pressure of the proportional relief valve within the range of 20-70 MPa, the tensioning pressure in the tensioning tool is controlled to be pressurized within the range of 120-170 MPa; by adjusting the slope of the current change, the pressure rise curve of the oil in the tensioning tool is controlled; The pressurization control process of 170-200 MPa is as follows: the first electromagnetic stop valve, the second electromagnetic stop valve, and the third electromagnetic stop valve are all in the disconnected state, the electromagnetic pressure maintaining valves are all in the connected state, the motor rotates to drive the ultra-high-pressure plunger pump to discharge hydraulic oil, and the oil returns to the oil tank through the first throttle damper, the second throttle damper, the third throttle damper, and the proportional relief valve; the outlet pressure of the third throttle damper is controlled by the proportional relief valve, and the oil flows through the first throttle damper, the second throttle damper, and the third throttle damper to generate a total pressure difference of 150 MPa. By adjusting the pressure of the proportional relief valve within 20-50 MPa, the tensioning pressure in the tensioning tool is controlled to be pressurized within the range of 170-200 MPa; and the pressure rise curve of the oil in the tensioning tool is controlled by adjusting the slope of the current change. During the entire pressurizing process, the tensioning pressure in the tensioning tool is accurately controlled through the pressure feedback of the second pressure sensor.

10. The control method of the ultra-high pressure proportional regulation system for the gear press-fitting process according to claim 9, characterized in that: The pressure reduction control of 200~0MPa in the tensioning tool in the gear press-fitting process is divided into four stages: 200-170Mpa, 170-120Mpa, 120-70Mpa, and 70-0Mpa, as follows: The pressure reduction control process of 200-170 MPa is as follows: the first electromagnetic stop valve, the second electromagnetic stop valve, and the third electromagnetic stop valve are all in the disconnected state, and the electromagnetic pressure maintaining valves are all in the connected state. The motor rotates to drive the ultra-high-pressure plunger pump to discharge hydraulic oil, and the oil returns to the oil tank through the first throttle damper, the second throttle damper, the third throttle damper, and the proportional relief valve; the outlet pressure of the third throttle damper is controlled by the proportional relief valve, and the oil flows through the first throttle damper, the second throttle damper, and the third throttle damper to generate a total pressure difference of 150 MPa. By adjusting the pressure of the proportional relief valve within 50-20 MPa, the tensioning pressure in the tensioning tool is controlled to be reduced within the range of 200-170 MPa; the pressure drop curve of the oil in the tensioning tool is controlled by adjusting the slope of the current change; The pressure reduction control process of 170-120 MPa is as follows: the first electromagnetic stop valve and the second electromagnetic stop valve are in the disconnected state, the third electromagnetic stop valve and the electromagnetic pressure maintaining valve are in the connected state, the motor rotates to drive the ultra-high pressure plunger pump to discharge the hydraulic oil, and the oil returns to the oil tank through the first throttle damper, the second throttle damper, the third electromagnetic stop valve (7), and the proportional relief valve; the outlet pressure of the second throttle damper is controlled by the proportional relief valve, and the oil flows through the first throttle damper and the second throttle damper to generate a pressure difference of 100 MPa. By adjusting the pressure of the proportional relief valve to change between 70-20 MPa, the tensioning pressure in the tensioning tool is controlled to be reduced within the range of 170-120 MPa; by adjusting the slope of the current change, the pressure drop curve of the oil inside the tensioning tool is controlled; The pressure reduction control process of 120-70 MPa is as follows: the first electromagnetic stop valve is in the disconnected state, the second electromagnetic stop valve, the third electromagnetic stop valve, and the electromagnetic pressure maintaining valve are all in the connected state, the motor rotates to drive the ultra-high-pressure plunger pump to discharge hydraulic oil, and the oil returns to the oil tank through the first throttle damper, the second electromagnetic stop valve, the third electromagnetic stop valve, and the proportional relief valve; the outlet pressure of the first throttle damper is controlled by the proportional relief valve, and the oil flows through the first throttle damper to generate a pressure difference of 50 MPa. By adjusting the pressure of the proportional relief valve to change between 70-20 MPa, the tensioning pressure in the tensioning tool is controlled to be reduced within the range of 120-70 MPa; the pressure drop curve of the oil in the tensioning tool is controlled by adjusting the slope of the current change; The 70-0 MPa pressure reduction control process is as follows: the first electromagnetic stop valve, the second electromagnetic stop valve, the third electromagnetic stop valve, and the electromagnetic pressure maintaining valve are all in the on state, the motor rotates to drive the ultra-high pressure plunger pump to discharge hydraulic oil, and the oil is quickly filled into the tightening tooling through the electromagnetic pressure maintaining valve. After the oil filling is completed, the tightening tooling becomes a closed cavity, and the tightening pressure is consistent with the system pressure; the oil returns to the oil tank through the first electromagnetic stop valve, the second electromagnetic stop valve, the third electromagnetic stop valve, and the proportional relief valve; by adjusting the current of the proportional relief valve to reduce, the pressure drop of the ultra-high pressure proportional regulation system is controlled; by adjusting the slope of the current reduction, the pressure drop curve of the oil in the tightening tooling is controlled; During the entire decompression control process, the tensioning pressure in the tensioning tool is accurately controlled through the pressure feedback of the second pressure sensor.

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