High-flow two-way cut-off two-way cartridge valve based on quantitative control

Abstract

The invention belongs to the technical field of two-way cartridge valves, and particularly relates to a large-flow two-way cut-off two-way cartridge valve based on quantitative control, which comprises a main valve, a pilot electromagnetic valve, a cover plate, a first one-way valve and a second one-way valve, the main valve comprises a main valve sleeve, a main valve core, a main valve spring and a cover pad; the pilot electromagnetic valve comprises a pilot valve sleeve, a pilot valve element, a pilot reset spring, a pilot cone valve element, an armature, a threaded sleeve and a coil. A first working opening and a second working opening are formed in the side face and the bottom of the main valve respectively, the main valve element is arranged in an axial hole of the main valve sleeve, the cover gasket is arranged at one end of the main valve sleeve, the main valve spring is arranged in an inner hole of the main valve element, and the cover plate is fixedly installed at the upper end of the cover gasket. The device solves the problem that the quantitative release effect is influenced by low release amount precision during quantitative release due to the fact that an existing two-way cut-off two-way cartridge valve is large in leakage after being used for a long time, cannot play a role in pressure maintaining and is slow in response time.

Description

Technical Field

[0001] The invention belongs to the technical field of two-way cartridge valves, and in particular relates to a large-flow bidirectional cut-off two-way cartridge valve based on quantitative control. Background Art

[0002] At present, the solenoid valve with a sliding valve structure is commonly used in the existing hydraulic circuit as a pilot solenoid valve to control the two-way cartridge valve to achieve the one-way pressure maintenance function. If a shuttle valve is added, it can achieve a two-way pressure maintenance function. Since the pilot solenoid valve adopts a cylindrical sealing structure, its defect is that it leaks a lot after a long time of use and cannot maintain pressure at all. The shuttle valve is a steel ball structure with a slow response time. In actual use, it is often easy to get the valve core stuck due to the large amount of impurities in the oil, and the pressure maintenance performance is low. In addition, for quantitative release of oil, excessive or insufficient oil release will occur, resulting in poor quantitative accuracy and the main valve core not closing in time. Summary of the invention

[0003] The object of the present invention is to provide a large flow bidirectional cut-off two-way cartridge valve based on quantitative control to solve the problems raised in the above background technology.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: a large flow two-way cut-off two-way cartridge valve based on quantitative control, comprising a main valve, a pilot solenoid valve, a cover plate, a first one-way valve and a second one-way valve, the main valve comprising a main valve sleeve, a main valve core, a main valve spring and a cover gasket, the pilot solenoid valve comprising a pilot valve sleeve, a pilot valve core, a pilot return spring, a pilot cone valve core, an armature, a screw sleeve and a coil; an intelligent control system is arranged inside the pilot solenoid valve, the intelligent control system comprising an oil pressure monitoring module, an elastic force judgment module and a time limit module; the side of the main valve The first working port and the second working port are respectively provided at the bottom, the main valve core is provided in the axial hole of the main valve sleeve, the cover gasket is provided at one end of the main valve sleeve, the main valve spring is provided in the inner hole of the main valve core, the cover plate is fixedly installed on the upper end of the cover gasket, the first damper is provided in the axial direction of the cover plate, and the pilot solenoid valve, the first one-way valve, the second one-way valve and the first damper are sequentially installed in the axial direction of the cover plate, the first control port, the second control port and the return oil port are provided on the bottom surface of the cover plate, the first damper is connected with the main valve spring chamber, and the pilot solenoid valve is provided on one axial side of the cover plate.

[0005] Preferably, one end of the pilot solenoid valve is communicated with the oil return port, the other end of the pilot solenoid valve is communicated with the first damping, the pilot valve core is arranged in the pilot valve sleeve, the pilot cone valve core is arranged in the pilot valve core, the pilot reset spring is arranged between the pilot valve core and the pilot cone valve core, the screw sleeve is installed on the upper end of the pilot valve sleeve, one end of the armature is provided with a T-slot, and the pilot cone valve core is connected to the armature through the T-slot, a pilot spring is arranged in the axial direction of the armature, and the pilot spring is installed between the armature and the screw sleeve. The coil is sleeved on one end of the screw sleeve, the first one-way valve and the second one-way valve each include a screw cover, a one-way valve sleeve, a one-way valve core and a spring, and the first one-way valve is arranged on one axial side of the cover plate; the oil pressure monitoring module is electrically connected to the elastic force judgment module and the time limitation module respectively, the oil pressure monitoring module is used to monitor the oil pressure, the elastic force judgment module is used to judge the elastic force of the main valve spring by conversion, and the time limitation module is used to control the power-off time of the coil and change the pressure of the control oil.

[0006] Preferably, a second damper is connected above the first control port, one end of the first one-way valve is interconnected with the second damper and the first control port, the one-way valve sleeve is arranged in the valve hole, the one-way valve core is arranged in the one-way valve sleeve, the spring is arranged in the one-way valve core, the screw sleeve is arranged at one end of the one-way valve sleeve, and one end of the first one-way valve is connected with the pilot solenoid valve and the first damper; the time limitation module includes a power-off control unit and an oil pressure control unit, the power-off control unit is electrically connected to the oil pressure control unit, the power-off control unit is used to control the advance power-off time of the coil, and the oil pressure control unit is used to change the oil pressure of the control oil.

[0007] Preferably, the operation steps of the intelligent control system include: step S1, the large-flow two-way two-way cut-off cartridge valve is operated, and the intelligent control system is started; step S2, the oil release amount is controlled, thereby controlling the coil power-off to achieve quantitative release of oil, and the early power-off of the coil and the duration of the early power-off are controlled according to the oil pressure; step S3, the elastic force of the main valve spring is determined by conversion through the elastic force judgment module, and the early power-off duration of the coil is optimized according to the elastic force. When the elastic force of the main valve spring is less than a certain value, step S4 is entered, otherwise step S5 is entered; step S4, the control oil pressure is increased, and the pressure of the control oil is changed according to the elastic force of the main valve spring and the oil pressure, and then the early power-off duration of the coil is further optimized according to the pressure of the control oil, and the pressure of the control oil is limited; step S5, the pilot solenoid valve is closed, so that the main valve core is closed and the oil circuit is disconnected.

[0008] Preferably, in step S2, the coil power-off time is controlled according to the quantitatively released oil amount, and the power-off time is set to , then the early power-off duration is , , is the oil pressure, is the maximum oil pressure, is the longest power-off duration; , The time after the coil is de-energized in advance.

[0009] Preferably, in step S3, the reaction force of the main valve spring is set to , , , The opening time of the main valve core under the reaction force of the main valve spring. The opening time of the main valve core under the maximum reaction force of the main valve spring. It is the maximum reaction force of the main valve spring; that is, the main valve core is pulled back to its original position under the influence of the reaction force of the main valve spring. The time of the reset process is combined with the factors affected by the oil pressure to obtain the optimized time after the coil is powered off in advance.

[0010] Preferably, in step S3 and step S4: hour, The main valve spring reaction force set for the system, that is, when the elasticity of the main valve spring decreases: the oil pressure of the control oil changes, and , To control the oil pressure, the control oil pressure increases and , is the limited control oil pressure; when When: the oil pressure of the control oil remains unchanged.

[0011] Preferably, in step S3 and step S4: hour: , , In order to control the opening time of the main valve core under the influence of oil pressure, To control the maximum oil pressure of the oil, To control the opening time of the main valve core under the influence of the maximum oil pressure of the oil; ;when hour: .

[0012] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the main valve of the present invention adopts a sliding structure, the valve core and the valve seat adopt a cone sealing structure, and the operation is reliable and stable; the pilot valve adopts a threaded cartridge structure, and the valve core and the valve seat adopt a cone sealing structure, which solves the problem of no leakage during long-term use and plays a role in maintaining pressure; the valve core is not easy to get stuck, and the switching inflexibility will not occur, so as to achieve the purpose of long service life; the overall structure is simple, the operation is reliable, there is no leakage, the pressure maintaining performance is good, there is no clamping phenomenon, and the service life is long, and it is widely used in two-way cut-off two-way cartridge valve equipment in high-pressure non-leakage pressure maintaining circuits; The greater the oil pressure, the greater the impact force of the oil pressure on the main valve core, and the slower it closes. Correspondingly, the coil can be de-energized earlier, so that pre-de-energization can be performed to ensure the accuracy of the oil release amount. By optimizing the length of time the coil is opened in advance, the oil release amount can be further controlled, and the oil quantitative accuracy can be further improved. The time required for the main valve spring to reset and the time required for the oil pressure to push the main valve core upward to reset are added together, and the coil de-energization time is further advanced, which can ensure that the oil release accuracy is fully guaranteed. When the reaction force of the main valve spring is reduced to a lower level, the elasticity is reduced. After the pilot solenoid valve is closed, the initial oil pressure of the control oil is insufficient to push the main valve spring to deform. At this time, the oil pressure of the control oil is increased to ensure the smooth closure of the main valve core; and the oil pressure of the control oil is not too high, thereby preventing the pilot solenoid valve from being affected by the hydraulic pressure of the control oil and being unable to open smoothly when opening, thereby ensuring the smooth opening and closing of the large-flow two-way stop two-way cartridge valve. Moreover, after the oil pressure of the control oil is increased, the oil pressure, the main valve spring and the oil pressure of the control oil interact with each other, thereby changing the smoothness of the opening and closing of the main valve core. Therefore, the time after the coil is powered off in advance is further optimized to further efficiently control the release amount of oil and play a role in precise quantitative control. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 is a cross-sectional view of the present invention; Figure 3 It is a schematic diagram of the present invention; Figure 4 It is a schematic diagram of the connection relationship of the intelligent control system modules of the present invention; In the figure: 1. main valve sleeve; 2. main valve core; 3. main valve spring; 4. cover gasket; 5. return oil port; 6. first damping; 7. pilot valve sleeve; 8. pilot valve core; 9. pilot return spring; 10. pilot cone valve core; 11. armature; 12. pilot spring; 13. coil; 14. screw sleeve; 15. pilot solenoid valve; 16. first one-way valve; 17. screw cover; 18. spring; 19. one-way valve core; 20. one-way valve sleeve; 21. second damping; 22. first control port; 23. main valve spring chamber; 24. main valve; 25. first working port; 26. second working port; 27. second one-way valve; 28. cover plate; 29. ​​third damping; 30. second control port. DETAILED DESCRIPTION

[0014] The following is a further non-limiting detailed description of the technical solution of the present invention in conjunction with the preferred embodiments and the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] See also Figure 1-4 The present invention provides a technical solution: a large flow two-way cut-off two-way cartridge valve based on quantitative control, including a main valve 24, a pilot solenoid valve 15, a cover plate 28, a first one-way valve 16 and a second one-way valve 27, the main valve 24 includes a main valve sleeve 1, a main valve core 2, a main valve spring 3 and a cover gasket 4; the pilot solenoid valve 15 includes a pilot valve sleeve 7, a pilot valve core 8, a pilot return spring 9, a pilot cone valve core 10, an armature 11, a screw sleeve 14 and a coil 13; the side and bottom of the main valve 24 are respectively provided with a first working port 25 and a second working port 26, the main valve core 2 is arranged in the axial hole of the main valve sleeve 1 , the cover gasket 4 is arranged at one end of the main valve sleeve 1, the main valve spring 3 is arranged in the inner hole of the main valve core 2, the cover plate 28 is fixedly installed on the upper end of the cover gasket 4, the first damper 6 is arranged in the axial direction of the cover plate 28, and the pilot solenoid valve 15, the first one-way valve 16, the second one-way valve 27 and the first damper 6 are sequentially installed in the axial direction of the cover plate 28, the bottom surface of the cover plate 28 is provided with a first control port 22, a second control port 30 and an oil return port 5, the first damper 6 is connected with the main valve spring chamber 23, the pilot solenoid valve 15 is arranged on one axial side of the cover plate 28, and one end of the pilot solenoid valve 15 is connected with the oil return port 5, The other end of the pilot solenoid valve 15 is connected to the first damping 6, the pilot valve core 8 is arranged in the pilot valve sleeve 7, the pilot cone valve core 10 is arranged in the pilot valve core 8, the pilot reset spring 9 is arranged between the pilot valve core 8 and the pilot cone valve core 10, the screw sleeve 14 is installed at the upper end of the pilot valve sleeve 7, one end of the armature 11 is provided with a T-slot, and the pilot cone valve core 10 is connected to the armature 11 through the T-slot, and the pilot spring 12 is arranged in the axial direction of the armature 11, and the pilot spring 12 is installed between the armature 11 and the screw sleeve 14, the coil 13 is sleeved on one end of the screw sleeve 14, the first check valve 16 and the first The two one-way valves 27 each include a screw cover 17, a one-way valve sleeve 20, a one-way valve core 19 and a spring 18. The first one-way valve 16 is arranged on one axial side of the cover plate 28. The second damper 21 is connected above the first control port 22. One end of the first one-way valve 16 is communicated with the second damper 21 and the first control port 22. The one-way valve sleeve 20 is arranged in the valve hole, the one-way valve core 19 is arranged in the one-way valve sleeve 20, the spring 18 is arranged in the one-way valve core 19, the screw sleeve 14 is arranged at one end of the one-way valve sleeve 20, and one end of the first one-way valve 16 is communicated with the pilot solenoid valve 15 and the first damper 6. An intelligent control system is provided inside the pilot solenoid valve 15; When the pilot solenoid valve 15 is not energized, the pilot valve core 8 and the pilot cone valve core 10 are in a closed state, and the control oil from the first control port 22 enters the first check valve 16 through the second damper 21. After the check valve core 19 is opened, the control oil enters the pilot solenoid valve 15, the second check valve 27 and the first damper 6, and the control oil enters the main valve spring chamber 23. Since the effective area of ​​the main valve core 2 spring chamber is larger than the effective area of ​​the second working port 26, the main valve core 2 is in a closed state, playing the role of a check valve; When the pilot solenoid valve 15 is not energized, the pilot valve core 8 and the pilot cone valve core 10 are in a closed state, and the control oil from the second control port 30 enters the second check valve 27 through the third damper 29. After the check valve core 19 is opened, the control oil enters the pilot solenoid valve 15, the first check valve 16 and the first damper 6, and the control oil enters the main valve spring chamber 23. Since the effective area of ​​the main valve core 2 spring chamber is larger than the effective area of ​​the second working port 26, the main valve core 2 is in a closed state, playing the role of a check valve; When the pilot solenoid valve 15 is energized, the coil 13 generates suction, the armature 11 moves upward, and the armature 11 drives the pilot cone valve core 10 to move upward. At this time, the pilot valve core 8 is in an open state, and the control oil from the first control port 22 or the control oil from the second control port 30 flows from the pilot solenoid valve 15 into the oil return port 5. At this time, there is no pressure in the main valve spring chamber 23, and the main valve core 2 is in an open state; The main valve adopts a slide-in structure, and the valve core and valve seat adopt a cone sealing structure, which works reliably and stably; the pilot valve adopts a threaded cartridge structure, and the valve core and valve seat adopt a cone sealing structure, which solves the problem of no leakage during long service life and plays a role in maintaining pressure; the valve core is not easy to get stuck, and there will be no inflexible switching phenomenon, thus achieving the purpose of long service life. The overall structure is simple, the operation is reliable, there is no leakage, the pressure maintaining performance is good, there is no clamping phenomenon, and the service life is long. It is widely used in two-way shut-off two-way cartridge valve equipment in high-pressure non-leakage pressure maintaining circuits.

[0016] The intelligent control system includes an oil pressure monitoring module, an elastic force judgment module and a time limit module; The oil pressure monitoring module is electrically connected to the elastic force judgment module and the time limitation module respectively. The oil pressure monitoring module is used to monitor the oil pressure. The elastic force judgment module is used to judge the elastic force of the main valve spring 3 by conversion. The time limitation module is used to control the power-off time of the coil 13 and change the control oil pressure.

[0017] The time limit module includes a power-off control unit and an oil pressure control unit. The power-off control unit is electrically connected to the oil pressure control unit. The power-off control unit is used to control the advance power-off time of the coil 13. The oil pressure control unit is used to change the oil pressure of the control oil.

[0018] The operation steps of the intelligent control system include: Step S1, the large flow two-way cut-off two-way cartridge valve is operated, and the intelligent control system is started; Step S2, controlling the amount of oil released, thereby controlling the coil 13 to be powered off, achieving quantitative oil release, and controlling the coil 13 to be powered off in advance and the duration of the early power-off according to the oil pressure; Step S3, the elastic force of the main valve spring 3 is determined by the elastic force determination module, and the early power-off time of the coil 13 is optimized according to the elastic force. When the elastic force of the main valve spring 3 is less than a certain value, the process proceeds to step S4, otherwise, the process proceeds to step S5; Step S4, the control oil pressure is increased, and the control oil pressure is changed according to the elastic force of the main valve spring 3 and the oil pressure, and then the early power-off time of the coil 13 is further optimized according to the control oil pressure, and the control oil pressure is limited; Step S5: The pilot solenoid valve 15 is closed, thereby closing the main valve core 2 and disconnecting the oil circuit.

[0019] In step S2, the power-off time of the coil 13 is controlled according to the quantitatively released oil amount, and the power-off time is set to , then the early power-off duration is , , is the oil pressure, is the maximum oil pressure, The longest power outage duration; Right now , The time after the coil 13 is powered off in advance; The greater the oil pressure, the greater the impact force of the oil pressure on the main valve core 2, and the slower it closes. Correspondingly, the coil 13 can be powered off earlier, so that pre-power off can be performed to ensure accurate oil release.

[0020] In step S3, the reaction force of the main valve spring 3 is set to , , , is the opening time of the main valve core 2 under the reaction force of the main valve spring 3, The opening time of the main valve core 2 under the maximum reaction force of the main valve spring 3, The maximum reaction force of the main valve spring 3; That is, the main valve core 2 is pulled back to its original position under the reaction force of the main valve spring 3. The time of the resetting process is combined with the factors affecting the oil pressure to obtain the optimized time after the coil 13 is powered off in advance. The greater the oil pressure, the greater the impact force of the oil pressure on the main valve core, and the slower it closes. Correspondingly, the coil can be de-energized earlier, so that pre-power-off can be performed to ensure the accurate amount of oil release, and by optimizing the length of time the coil is opened in advance, it can further control the amount of oil released, and further improve the oil quantitative accuracy. The time required for the main valve spring to reset, and the time required for the oil pressure to push the main valve core upward to reset, after adding the two together, the time to de-energize the coil can be further advanced, which can ensure that the oil release accuracy is fully guaranteed.

[0021] In step S3 and step S4: when hour, The reaction force of the main valve spring 3 set by the system, that is, when the elasticity of the main valve spring 3 decreases: the oil pressure of the control oil changes, and , To control the oil pressure, the control oil pressure increases and , The oil pressure of the control oil is limited; when When: the oil pressure of the control oil remains unchanged; When the reaction force of the main valve spring is reduced to a lower level, the elasticity is reduced. After the pilot solenoid valve is closed, the initial oil pressure of the control oil is insufficient to push the main valve spring to deform. At this time, the oil pressure of the control oil is increased to ensure the smooth closure of the main valve core; and the oil pressure of the control oil is not too high, thereby preventing the pilot solenoid valve from being affected by the hydraulic pressure of the control oil and being unable to open smoothly when it is opened, thereby ensuring the smooth opening and closing of the large-flow two-way shut-off two-way cartridge valve.

[0022] In step S3 and step S4: when hour: , , In order to control the opening time of the main valve core 2 under the influence of oil pressure, To control the maximum oil pressure of the oil, To control the opening time of the main valve core 2 under the influence of the maximum oil pressure of the oil; Right now ; when hour: ; When the oil pressure of the control oil increases, the interaction force between the oil pressure, the main valve spring and the oil pressure of the control oil changes the smoothness of the opening and closing of the main valve core. Therefore, the time after the coil is powered off in advance is further optimized to further efficiently control the release amount of oil and play a role in precise quantitative control.

[0023] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0024] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents, and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A large flow bidirectional cut-off two-way cartridge valve based on quantitative control, comprising a main valve (24), a pilot solenoid valve (15), a cover plate (28), a first check valve (16) and a second check valve (27), characterized in that: The main valve (24) comprises a main valve sleeve (1), a main valve core (2), a main valve spring (3) and a cover gasket (4); the pilot solenoid valve (15) comprises a pilot valve sleeve (7), a pilot valve core (8), a pilot return spring (9), a pilot cone valve core (10), an armature (11), a screw sleeve (14) and a coil (13); An intelligent control system is arranged inside the pilot solenoid valve (15), and the intelligent control system comprises an oil pressure monitoring module, an elastic force judgment module and a time limit module; The side and bottom of the main valve (24) are respectively provided with a first working port (25) and a second working port (26); the main valve core (2) is arranged in the axial hole of the main valve sleeve (1); the cover gasket (4) is arranged at one end of the main valve sleeve (1); the main valve spring (3) is arranged in the inner hole of the main valve core (2); the cover plate (28) is fixedly installed on the upper end of the cover gasket (4); a first damper (6) is arranged axially inside the cover plate (28); and a pilot solenoid valve (15), a first one-way valve (16), a second one-way valve (27) and the first damper (6) are sequentially installed axially inside the cover plate (28); a first control port (22), a second control port (30) and an oil return port (5) are arranged on the bottom surface of the cover plate (28); the first damper (6) is connected to the main valve spring chamber (23); and the pilot solenoid valve (15) is arranged on one axial side of the cover plate (28).

2. The large flow bidirectional cut-off two-way cartridge valve based on quantitative control according to claim 1 is characterized in that: One end of the pilot solenoid valve (15) is in communication with the oil return port (5), and the other end of the pilot solenoid valve (15) is in communication with the first damper (6). The pilot valve core (8) is arranged in the pilot valve sleeve (7), and the pilot cone valve core (10) is arranged in the pilot valve core (8). The pilot return spring (9) is arranged between the pilot valve core (8) and the pilot cone valve core (10). The screw sleeve (14) is installed on the upper end of the pilot valve sleeve (7). One end of the armature (11) is provided with a T-shaped groove, and the pilot cone valve core (10) is provided with a T-shaped groove. (10) is connected to the armature (11) through a T-slot, a pilot spring (12) is arranged in the axial direction of the armature (11), the pilot spring (12) is installed between the armature (11) and the screw sleeve (14), the coil (13) is sleeved on one end of the screw sleeve (14), the first one-way valve (16) and the second one-way valve (27) both include a screw cover (17), a one-way valve sleeve (20), a one-way valve core (19) and a spring (18), and the first one-way valve (16) is arranged on one axial side of the cover plate (28); The oil pressure monitoring module is electrically connected to the elastic force judgment module and the time limit module respectively. The oil pressure monitoring module is used to monitor the oil pressure. The elastic force judgment module is used to judge the elastic force of the main valve spring (3) by conversion. The time limit module is used to control the power-off time of the coil (13) and change the control oil pressure.

3. The large flow bidirectional cut-off two-way cartridge valve based on quantitative control according to claim 2 is characterized in that: A second damper (21) is connected above the first control port (22); one end of the first one-way valve (16) is in communication with the second damper (21) and the first control port (22); the one-way valve sleeve (20) is arranged in the valve hole; the one-way valve core (19) is arranged in the one-way valve sleeve (20); the spring (18) is arranged in the one-way valve core (19); the screw sleeve (14) is arranged at one end of the one-way valve sleeve (20); and one end of the first one-way valve (16) is in communication with the pilot solenoid valve (15) and the first damper (6); The time limit module comprises a power-off control unit and an oil pressure control unit, wherein the power-off control unit is electrically connected to the oil pressure control unit, the power-off control unit is used to control the advance power-off time of the coil (13), and the oil pressure control unit is used to change the oil pressure of the control oil.

4. The large flow bidirectional cut-off two-way cartridge valve based on quantitative control according to claim 3 is characterized in that: The operation steps of the intelligent control system include: Step S1, the large flow two-way cut-off two-way cartridge valve is operated, and the intelligent control system is started; Step S2, controlling the amount of oil released, thereby controlling the coil (13) to be powered off, achieving quantitative oil release, and controlling the coil (13) to be powered off in advance and the duration of the early power-off according to the oil pressure; Step S3, determining the elastic force of the main valve spring (3) by converting it through the elastic force determination module, and optimizing the early power-off time of the coil (13) according to the elastic force; when the elastic force of the main valve spring (3) is less than a certain value, proceeding to step S4; otherwise, proceeding to step S5; Step S4, the control oil pressure is increased, and the control oil pressure is changed according to the elastic force of the main valve spring (3) and the oil pressure, and then the early power-off time of the coil (13) is further optimized according to the control oil pressure, and the control oil pressure is limited; Step S5: The pilot solenoid valve (15) is closed, thereby closing the main valve core (2) and disconnecting the oil circuit.

5. The large flow bidirectional cut-off two-way cartridge valve based on quantitative control according to claim 4 is characterized in that: In step S2, the power-off time of the coil (13) is controlled according to the quantitatively released amount of oil, and the power-off time is set to , then the early power-off duration is , , is the oil pressure, is the maximum oil pressure, The longest power outage duration; Right now , The time after the coil (13) is de-energized in advance.

6. The large flow bidirectional cut-off two-way cartridge valve based on quantitative control according to claim 5 is characterized in that: In step S3, the reaction force of the main valve spring (3) is set to , , , is the opening time of the main valve core (2) under the reaction force of the main valve spring (3), The opening time of the main valve core (2) under the maximum reaction force of the main valve spring (3), is the maximum reaction force of the main valve spring (3); That is, the main valve core (2) is pulled back to its original position under the influence of the reaction force of the main valve spring (3). The time of the resetting process is combined with the factor of the oil pressure, and the optimized time after the coil (13) is powered off in advance is obtained.

7. The large flow bidirectional cut-off two-way cartridge valve based on quantitative control according to claim 6 is characterized in that: In the steps S3 and S4: when hour, When the reaction force of the main valve spring (3) set by the system, that is, the elasticity of the main valve spring (3) decreases: the oil pressure of the control oil changes, and , To control the oil pressure, the control oil pressure increases and , The oil pressure of the control oil is limited; when When: the oil pressure of the control oil remains unchanged.

8. The large flow bidirectional cut-off two-way cartridge valve based on quantitative control according to claim 7, characterized in that: In the steps S3 and S4: when hour: , , To control the opening time of the main valve core (2) under the influence of the oil pressure, To control the maximum oil pressure of the oil, To control the opening time of the main valve core (2) under the influence of the maximum oil pressure of the control oil; Right now ; when hour: .

Images