CN113565819B - Support boots pressure control system based on high-speed switch valve - Google Patents
Support boots pressure control system based on high-speed switch valve Download PDFInfo
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- CN113565819B CN113565819B CN202110889327.9A CN202110889327A CN113565819B CN 113565819 B CN113565819 B CN 113565819B CN 202110889327 A CN202110889327 A CN 202110889327A CN 113565819 B CN113565819 B CN 113565819B
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- 238000006073 displacement reaction Methods 0.000 claims abstract description 35
- 239000010720 hydraulic oil Substances 0.000 claims description 54
- 239000003921 oil Substances 0.000 claims description 35
- 238000000034 method Methods 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 8
- 238000012423 maintenance Methods 0.000 claims description 3
- 230000003749 cleanliness Effects 0.000 abstract description 3
- 230000036632 reaction speed Effects 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 abstract 1
- 238000013461 design Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
- F15B19/005—Fault detection or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The application discloses a supporting shoe pressure control system based on a high-speed switch valve, which comprises a double-acting single-rod hydraulic cylinder group, wherein a second chamber of the double-acting single-rod hydraulic cylinder group is respectively connected with a first port B of the high-speed switch valve and a second port B of the high-speed switch valve, a second port A of the high-speed switch valve is connected with a third port B of the high-speed switch valve, and the double-acting single-rod hydraulic cylinder group is connected with a displacement sensor. The system has the advantages that the control of the valve port flow of the high-speed switch valve is realized by adjusting the duty ratio of the PWM signals based on three high-speed switch valves controlled by the PWM signals, and compared with the traditional shoe supporting pressure control system, the system has the advantages of low cost, insensitivity of the high-speed switch valve to oil liquid cleanliness, high reaction speed, high control precision, capability of detecting internal leakage and the like.
Description
Technical Field
The application relates to a shoe supporting pressure control system based on a high-speed switch valve, which has the functions of on-line adjustment of shoe supporting pressure, on-line detection of internal leakage and the like on the premise of realizing the shoe supporting function.
Background
The shoe supporting pressure control system is widely applied in tunnel construction, the shoe supporting pressure control system needs to have certain pressure online adjustment capability and internal leakage online detection capability, the traditional shoe supporting pressure control system is difficult to meet the requirements, a TBM propulsion supporting hydraulic system with thrust and supporting force being coupled and regulated in real time is mentioned in Chinese patent application No. CN104373398B, high-pressure low-flow oil sources and low-pressure high-flow oil sources which are not possessed by a general hydraulic system are adopted for parallel control, and a method for controlling a shoe supporting oil cylinder by adopting a pressure reducing valve cannot realize reliable and accurate control and intelligent detection of pressure when the shoe supporting oil cylinder is tightly supported.
Disclosure of Invention
Aiming at the problems, the design of the supporting shoe pressure control system has the advantages of on-line supporting shoe pressure adjustment and on-line internal leakage detection. The system is based on three high-speed switch valves controlled by PWM signals, realizes the control of the valve port flow of the high-speed switch valve by adjusting the duty ratio of the PWM signals, and has the advantages of low cost, insensitivity of the high-speed switch valve to oil cleanliness, high reaction speed, high control precision, capability of detecting internal leakage and the like compared with the traditional shoe supporting pressure control system. The technical scheme is that the supporting shoe pressure control system based on the high-speed switch valve comprises a double-acting single-rod hydraulic cylinder group, wherein a second chamber of the double-acting single-rod hydraulic cylinder group is connected with a first port B of the high-speed switch valve and a second port B of the high-speed switch valve respectively, a second port A of the high-speed switch valve is connected with a second port B of a third high-speed switch valve, and the double-acting single-rod hydraulic cylinder group is connected with a displacement sensor.
Furthermore, the first port of the high-speed switch valve, the second port of the high-speed switch valve and the double-acting single-rod hydraulic cylinder group are connected with the first pressure sensor.
Furthermore, the second port A of the high-speed switch valve and the third port B of the high-speed switch valve are respectively connected with the second pressure sensor, and the second pressure sensor is connected with the energy accumulator.
The system comprises a hydraulic circuit, wherein the hydraulic circuit comprises a high-speed switch valve III, a high-speed switch valve II and a high-speed switch valve I; the port A of the high-speed switch valve III is connected with the oil tank, and the port B is respectively connected with the port A of the pressure sensor II, the accumulator and the high-speed switch valve II; the port B of the high-speed switch valve II is respectively connected with the port A of the pressure sensor I, the port B of the high-speed switch valve I and the port B of the double-acting single-rod hydraulic cylinder group; the port A of the first high-speed switch valve is connected with the oil tank; the port A of the double-acting single-rod hydraulic cylinder group is connected with an oil tank.
Further, the boosting process of the shoe supporting hydraulic system is as follows:
when the pressure signal of the first pressure sensor is lower than the preset pressure, the first pressure sensor transmits the pressure signal to the pressure controller through the control circuit d, the pressure controller transmits the PWM control signal to the second high-speed switch valve through the control circuit f according to the pressure signal of the first pressure sensor, the valve core of the second high-speed switch valve is controlled to realize high-speed switching of the left position and the right position, the control of the flow rate of the two valve ports of the high-speed switch valve is realized by adjusting the duty ratio of the PWM control signal, when the port A and the port B of the second high-speed switch valve are in a conducting state, high-pressure oil in the accumulator flows out through the port A, hydraulic oil flowing out of the port A of the accumulator flows into the second pressure sensor through the control circuit d, the hydraulic oil flows into the first pressure sensor through the second high-speed switch valve, the first chamber of the double-acting single-output-rod hydraulic cylinder directly flows back to the oil tank through the first chamber of the single-output-rod hydraulic cylinder, the pressure of the double-acting single-rod hydraulic cylinder is gradually increased through the high-speed switching of the valve core, and when the pressure of the hydraulic oil reaches the preset pressure of the first pressure of the pressure sensor, the pressure of the first pressure sensor is adjusted through the control circuit d, the pressure sensor is controlled to realize the high-speed switching of the pressure sensor, and the pressure signal is transmitted to the high-speed control system through the PWM control circuit to the control circuit.
Further, the pressure release process of the shoe supporting hydraulic system is as follows:
when the pressure signal of the first pressure sensor is higher than the preset pressure, the first pressure sensor transmits the pressure signal to the pressure controller through the control line d, the pressure controller transmits the PWM control signal to the first high-speed switch valve through the control line e according to the pressure signal of the first pressure sensor, the valve core of the first high-speed switch valve is controlled to realize high-speed switching between the left position and the right position, the control of the valve port flow of the first high-speed switch valve is realized by adjusting the duty ratio of the PWM control signal, when the opening A and the opening B of the first high-speed switch valve are in a conducting state, hydraulic oil of the second chamber of the double-acting single-rod cylinder group respectively flows into the first pressure sensor and the first high-speed switch valve, the hydraulic oil flows back to the oil tank from the opening A of the first high-speed switch valve after passing through the first high-speed switch valve, the pressure of the hydraulic oil of the second chamber of the single-rod hydraulic cylinder group is gradually reduced, when the pressure of the first high-speed switch valve reaches the preset pressure of the first pressure sensor, the pressure sensor transmits the pressure signal to the pressure controller through the double-acting control line d, the pressure controller transmits the hydraulic oil control signal to the second chamber through the control line e, the pressure controller transmits the hydraulic oil to the second chamber of the second chamber to realize the high-speed switch valve, and the duty ratio of the hydraulic valve is adjusted to realize the high-speed switching, and the pressure control valve is adjusted to the duty ratio to be zero.
Further, the pressure maintaining process of the accumulator is as follows:
when the pressure of the second pressure sensor is lower than the preset pressure, the second pressure sensor transmits a pressure signal to a pressure controller through a control line c, the pressure controller transmits a PWM control signal to a third high-speed switch valve through a control line g, the valve core of the third high-speed switch valve is controlled to realize high-speed switching between the left position and the right position by adjusting the duty ratio of the PWM control signal, and when an opening A and an opening B of the third high-speed switch valve are in a conducting state, hydraulic oil in a hydraulic oil source flows into the second pressure sensor through the third high-speed switch valve; the pressure controller transmits a PWM control signal to the third high-speed switch valve through a control line g when the pressure of the second pressure sensor reaches the preset pressure, and the third high-speed switch valve is controlled to be in the right position by adjusting the duty ratio of the PWM control signal to zero so as to realize the pressure maintenance of the energy accumulator.
Further, the online detection process of the internal leakage of the shoe supporting hydraulic system comprises the following steps:
the pressure sensor I transmits the pressure signal to the pressure controller through the control circuit d, the displacement sensor I and the displacement sensor II transmit the displacement signal of the double-acting single-rod hydraulic cylinder group to the pressure controller through the control circuit a and the control circuit B respectively, when the double-acting single-rod hydraulic cylinder group is leaked internally, the pressure of hydraulic oil in a second cavity is reduced, the pressure controller transmits PWM control signals to the high-speed switch valve II through the control circuit f according to the pressure signal of the pressure sensor I, the high-speed switching between the left position and the right position of a valve core of the high-speed switch valve II is controlled, when an opening A and an opening B of the high-speed switch valve II are in a conducting state, the high-pressure oil in the energy accumulator flows out through the opening A of the energy accumulator and flows out of the high-speed switch valve II respectively, the hydraulic oil flows out of the opening B of the high-speed switch valve II after passing through the high-speed switch valve II flows back into the pressure sensor I and the second cavity of the double-acting single-rod hydraulic cylinder group, and the hydraulic oil in the oil tank of the first cavity of the double-acting single-rod hydraulic cylinder group flows back directly; through the high-speed switching of the left position and the right position of the valve core of the high-speed switching valve II, the pressure of hydraulic oil in the second chamber of the double-acting single-rod hydraulic cylinder group gradually rises, when the pressure of the hydraulic oil returns to the front of internal leakage, the pressure sensor I transmits a pressure signal to the pressure controller through the control line d, the pressure controller transmits a PWM control signal to the high-speed switching valve II through the control line f, the high-speed switching valve II is controlled to be switched to the right position by adjusting the duty ratio of the PWM control signal to zero, the valve port flow of the high-speed switching valve is calculated according to the displacement signals of the displacement sensor I and the displacement sensor II, the pressure signals of the pressure sensor I and the pressure sensor II and the control signal of the high-speed switching valve II, and then the internal leakage of the double-acting single-rod hydraulic cylinder is calculated.
Advantageous effects
The design of the supporting shoe pressure control system has the advantages of on-line supporting shoe pressure adjustment and on-line internal leakage detection. The system is based on three high-speed switch valves controlled by PWM signals, realizes the control of the valve port flow of the high-speed switch valve by adjusting the duty ratio of the PWM signals, and has the advantages of low cost, insensitivity to oil cleanliness, high reaction speed, high control precision, capability of detecting internal leakage and the like compared with the traditional shoe supporting pressure control system.
Drawings
FIG. 1 is a schematic diagram of the structure of the present application;
the hydraulic system comprises a 1-first double-acting single-rod hydraulic cylinder, a 2-second double-acting single-rod hydraulic cylinder, a 3-displacement sensor I, a 4-displacement sensor II, a 5-pressure sensor I, a 6-high-speed switch valve I, a 7-high-speed switch valve II, an 8-energy accumulator, a 9-pressure sensor II, a 10-high-speed switch valve III, an 11-hydraulic oil source, a 12-oil tank, a 13-pressure controller, a control circuit a, a control circuit b, a control circuit c, a control circuit d, a control circuit e, a control circuit f and a control circuit g.
Detailed Description
The following detailed description is exemplary and is intended to provide further explanation of the application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application.
The hydraulic control system comprises a first double-acting single-rod hydraulic cylinder 1, a second double-acting single-rod hydraulic cylinder 2, a first displacement sensor 3, a second displacement sensor 4, a first pressure sensor 5, a first high-speed switch valve 6, a second high-speed switch valve 7, an energy accumulator 8, a second pressure sensor 9, a third high-speed switch valve 10, a hydraulic oil source 11, an oil tank 12, a pressure controller 13, a control line a, a control line b, a control line c, a control line d, a control line e, a control line f and a control line g.
The double-acting single-rod hydraulic cylinder group comprises a first double-acting single-rod hydraulic cylinder 1 and a second double-acting single-rod hydraulic cylinder 2.
System hydraulic circuit: an A port (10A) of the high-speed switch valve III 10 is connected with an oil tank 11; the port B (10B) of the high-speed switch valve III 10 is respectively connected with the port A (9A) of the pressure sensor II 9, the port A (8A) of the energy accumulator 8 and the port A (7A) of the high-speed switch valve II 7; the port B (7B) of the high-speed switch valve II 7 is respectively connected with the port A (5A) of the pressure sensor I5, the port B (6B) of the high-speed switch valve I6, the port B (1B) of the first double-acting single-rod hydraulic cylinder 1 and the port B (2B) of the second double-acting single-rod hydraulic cylinder 2; an A port (6A) of the first high-speed switch valve 6 is connected with an oil tank 12; the port A (1A) of the first double-acting single-rod hydraulic cylinder 1 is connected with an oil tank 12; port a (2A) of the second double-acting single-rod hydraulic cylinder 2 and the oil tank 12.
System control loop: the pressure controller 13 is respectively connected with the displacement sensor I3 through a line a; is connected with a second displacement sensor 4 through a line b; the second pressure sensor is connected with the second pressure sensor 9 through a control circuit c; is connected with the first pressure sensor 5 through a control line d; the high-speed switch valve I6 is connected with the control circuit e; the high-speed switch valve II is connected with the high-speed switch valve II 7 through a control circuit f; is connected with a high-speed switch valve III 10 through a control line g. The first displacement sensor 3 measures the displacement of the hydraulic rod of the first single-rod hydraulic cylinder 1, and the second displacement sensor 4 measures the displacement of the hydraulic rod of the second single-rod hydraulic cylinder 2.
When the first high-speed switch valve 6, the second high-speed switch valve 7 and the third high-speed switch valve 10 are positioned at the left position, the port A and the port B are in a communication state; when the device is positioned at the right position, the port A and the port B are in a disconnected state.
Boost of the shoe hydraulic system: when the pressure signal of the first pressure sensor 5 is lower than the preset pressure, the first pressure sensor 5 transmits the pressure signal to the pressure controller 13 through the control line d, the pressure controller 13 transmits PWM control signals to the second high-speed switch valve 7 through the control line f according to the pressure signal of the first pressure sensor 5, the valve core of the second high-speed switch valve 7 is controlled to realize high-speed switching between the left position and the right position, the control of the valve port flow of the second high-speed switch valve 7 is realized by adjusting the duty ratio of the PWM control signals, when the port A (7A) and the port B (7B) of the second high-speed switch valve 7 are in a conducting state, high-pressure oil in the accumulator 8 flows out through the port A (8A) of the accumulator 8 and flows into the pressure sensor 9 through the port A (9A) of the pressure sensor 9 respectively, flows out through the port A (7A) of the second high-speed switch valve 7, flows out through the port B (7B) of the high-speed switch valve 7 after passing through the second high-speed switch valve 7, the hydraulic oil flows out of the port B (7B) of the high-speed switch valve B) and flows into the single-acting hydraulic cylinder (2A) through the first rod (2A) of the first rod (2) of the second rod) of the first high-speed switch valve, flows out of the first rod (2A) and directly flows into the first rod (2A) of the first rod (2) of the second rod) of the first rod, and the second rod (2) directly flows out of the first rod (2B) of the second rod) of the high-speed rod, and the second rod (2) is directly flows out of the second rod) through the second rod (2B) and the second rod, the valve is directly, when the pressure of hydraulic oil in the second chamber of the first double-acting single-rod hydraulic cylinder 1 and the second chamber of the second double-acting single-rod hydraulic cylinder 2 gradually rises, the pressure sensor I5 transmits a pressure signal to the pressure controller 13 through a control line d when the pressure of the hydraulic oil reaches the preset pressure of the pressure sensor I5, the pressure controller 13 transmits a PWM control signal to the high-speed switch valve II 7 through a control line f, the duty ratio of the PWM control signal is adjusted to zero, the high-speed switch valve II 7 is controlled to be switched to the right position, and the pressurization of the shoe supporting hydraulic system is completed.
Decompression of shoe supporting hydraulic system: when the pressure signal of the pressure sensor I5 is higher than the preset pressure, the pressure sensor I5 transmits the pressure signal to the pressure controller 13 through the control circuit d, the pressure controller 13 transmits the PWM control signal to the high-speed switch valve I6 through the control circuit e according to the pressure signal of the pressure sensor I5, the valve core of the high-speed switch valve I6 is controlled to realize the high-speed switching of the left position and the right position, the control of the valve port flow of the high-speed switch valve I6 is realized by adjusting the duty ratio of the PWM control signal, when the port A (6A) and the port B (6B) of the high-speed switch valve I6 are in a conducting state, the hydraulic oil of the second chamber of the first double-acting single-output rod cylinder 1 flows out through the port B (1B) of the hydraulic oil in the second chamber of the second double-acting single-output rod cylinder 2, the hydraulic oil flowing out of the port B (1B) of the first double-acting single-rod cylinder 1 and the port B (2B) of the second double-acting single-rod cylinder 2 respectively flows into the pressure sensor 5 through the port A (5A) of the pressure sensor 1, flows into the high-speed switch valve 6 through the port B (6B) of the high-speed switch valve 6, flows out of the port A of the high-speed switch valve 6 after passing through the high-speed switch valve 6, directly flows back to the oil tank 12, the pressure of the hydraulic oil in the second chamber of the first double-acting single-rod cylinder 1 and the second chamber of the second double-acting single-rod cylinder 2 is gradually reduced through the high-speed switch valve 6 by the high-speed switch of the valve core of the high-speed switch valve 6, when the pressure of the hydraulic oil reaches the preset pressure of the pressure sensor 1, the pressure sensor 5 transmits the pressure signal to the pressure controller 13 through the control circuit d, the pressure controller 13 transmits a PWM control signal to the first high-speed switch valve 6 through the control circuit e, the duty ratio of the PWM control signal is adjusted to zero, the first high-speed switch valve 6 is controlled to be switched to the right position, and the pressure release of the shoe supporting hydraulic system is completed.
Pressure maintenance of the accumulator: when the pressure of the second pressure sensor 9 is lower than the preset pressure, the second pressure sensor 9 transmits a pressure signal to the pressure controller 13 through the control line c, the pressure controller 13 transmits a PWM control signal to the third high-speed switch valve 10 through the control line g, the valve core of the third high-speed switch valve 10 is controlled to realize high-speed switching of the left position and the right position by adjusting the duty ratio of the PWM control signal, the control of the flow rate of the third high-speed switch valve 10 is realized, when the port A (10A) and the port B (10B) of the third high-speed switch valve 10 are in a conducting state, hydraulic oil in the hydraulic oil source 11 flows into the third high-speed switch valve 10 through the port A (10A) of the third high-speed switch valve 10, the hydraulic oil flows out of the port B (10B) of the third high-speed switch valve 10 through the port A (9A) of the second pressure sensor 9 respectively, the hydraulic oil flows into the accumulator 8 through the port A (8A) of the accumulator 8, and when the pressure controller of the second pressure switch valve 9 is preset, the pressure of the pressure sensor reaches the third high-speed switch valve 10 through the control line g, the PWM control signal is kept to reach the high-speed switch valve 10, and the high-speed switch valve is adjusted to reach the duty ratio of zero, and the PWM signal is completely adjusted.
On-line detection of leakage in a shoe hydraulic system: the first pressure sensor 5 transmits the pressure signal to the pressure controller 13 through the control circuit d, the second pressure sensor 9 transmits the pressure signal to the pressure controller 13 through the control circuit c, the first displacement sensor 3 transmits the displacement signal of the first double-acting single-rod hydraulic cylinder 1 to the pressure controller 13 through the control circuit a, the second displacement sensor 4 transmits the displacement signal of the second double-acting single-rod hydraulic cylinder 2 to the pressure controller 13 through the control circuit B, when the first double-acting single-rod hydraulic cylinder 1 and the second double-acting single-rod hydraulic cylinder 2 leak inwards, the pressure of hydraulic oil in the second chamber of the first double-acting single-rod hydraulic cylinder 1 and the second chamber of the second double-acting single-rod hydraulic cylinder 2 decreases, the pressure controller 13 transmits PWM control signals to the high-speed switch valve II 7 through the control circuit f according to the pressure signals of the pressure sensor I5, controls the high-speed switching of the left position and the right position of the valve core of the high-speed switch valve II 7, realizes the control of the flow rate of the high-speed switch valve II 7, when the port A (7A) and the port B (7B) of the high-speed switch valve II 7 are in a conducting state, high-pressure oil in the accumulator 8 flows out through the port A (8A) of the accumulator 8, hydraulic oil flowing out of the port A (8A) of the accumulator 8 flows into the pressure sensor 9 through the port A (9A) of the pressure sensor II 9 respectively, flows into the high-speed switch valve II 7 through the port A (7A) of the high-speed switch valve II 7, hydraulic oil flows out through the port B (7B) of the high-speed switch valve II 7 after passing through the high-speed switch valve II, hydraulic oil flowing out through the port B (7B) of the high-speed switch valve II flows into the pressure sensor 5 through the port A (5A) of the pressure sensor I5 respectively, the hydraulic oil flowing into the second chamber through the port B (1B) of the first double-acting single-rod hydraulic cylinder 1 flows into the second chamber through the port B (2B) of the second double-acting single-rod hydraulic cylinder 2, the hydraulic oil of the first chamber of the first double-acting single-rod hydraulic cylinder 1 directly flows back to the oil tank 12 through the port A (1A), the hydraulic oil of the first chamber of the second double-acting single-rod hydraulic cylinder 2 directly flows back to the oil tank 12 through the port A (2A), the high-speed switching of the left position and the right position of the valve core of the high-speed switching valve II 7 is performed, the pressure of the hydraulic oil in the second chamber of the first double-acting single-rod hydraulic cylinder 1 and the second chamber of the second double-acting single-rod hydraulic cylinder 2 is gradually increased, when the pressure of the hydraulic oil returns to the internal leakage, the first pressure sensor 5 transmits the pressure signal to the pressure controller 13 through the control line d, the pressure controller 13 transmits the PWM control signal to the high-speed switching valve II 7 through the control line f, the high-speed switching valve II is controlled to zero through the duty ratio of the control signal, the high-speed switching valve II 7 is controlled to be switched to the high-speed switching valve 7, the displacement signal of the high-speed switching valve II is calculated according to the displacement signal of the high-speed switching valve 4, and the displacement signal of the high-speed switching valve 4 is calculated according to the displacement signal of the high-speed switching valve 4, and the displacement signal of the high-speed switching valve signal, and the displacement signal of the high-speed switching valve 4.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (5)
1. The shoe supporting pressure control system based on the high-speed switch valve is characterized by comprising a double-acting single-rod hydraulic cylinder group, a system hydraulic circuit and a pressure controller, wherein a second chamber of the double-acting single-rod hydraulic cylinder group is respectively connected with a first port B of the high-speed switch valve and a second port B of the high-speed switch valve, a second port A of the high-speed switch valve is connected with a third port B of the high-speed switch valve, and the double-acting single-rod hydraulic cylinder group is connected with a displacement sensor;
the first port B of the high-speed switch valve, the second port B of the high-speed switch valve and the double-acting single-rod hydraulic cylinder group are connected with the first pressure sensor;
the second port A of the high-speed switch valve and the third port B of the high-speed switch valve are respectively connected with the second pressure sensor, and the second pressure sensor is connected with the energy accumulator;
the hydraulic circuit comprises a third high-speed switch valve, a second high-speed switch valve and a first high-speed switch valve; the port A of the high-speed switch valve III is connected with the oil tank, and the port B is respectively connected with the port A of the pressure sensor II, the accumulator and the high-speed switch valve II; the port B of the high-speed switch valve II is respectively connected with the port A of the pressure sensor I, the port B of the high-speed switch valve I and the port B of the double-acting single-rod hydraulic cylinder group; the port A of the first high-speed switch valve is connected with the oil tank; the port A of the double-acting single-rod hydraulic cylinder group is connected with an oil tank;
the pressure controller collects pressure signals of the first pressure sensor, the valve port flow of the second high-speed switch valve or the first high-speed switch valve is controlled by adjusting the duty ratio of the PWM control signals, and when an opening A and an opening B of the second high-speed switch valve are in a conducting state, high-pressure oil in the energy accumulator flows into a second chamber of the double-acting single-output-rod hydraulic cylinder group, so that the boost of the shoe supporting hydraulic system is realized; when the opening A and the opening B of the high-speed switch valve I are in a conducting state, hydraulic oil of the second chamber of the double-acting single-rod cylinder group directly flows back to the oil tank through the opening A of the high-speed switch valve I, so that pressure relief of the shoe supporting hydraulic system is realized.
2. The shoe pressure control system based on the high-speed switch valve according to claim 1, wherein the boosting process of the shoe hydraulic system is as follows: when the pressure signal of the first pressure sensor is lower than the preset pressure, the first pressure sensor transmits the pressure signal to the pressure controller through the control circuit d, the pressure controller transmits the PWM control signal to the second high-speed switch valve through the control circuit f according to the pressure signal of the first pressure sensor, the valve core of the second high-speed switch valve is controlled to realize high-speed switching of the left position and the right position, the control of the flow rate of the two valve ports of the high-speed switch valve is realized by adjusting the duty ratio of the PWM control signal, when the port A and the port B of the second high-speed switch valve are in a conducting state, high-pressure oil in the accumulator flows out through the port A, hydraulic oil flowing out of the port A of the accumulator flows into the second pressure sensor through the control circuit d, the hydraulic oil flows into the first pressure sensor through the second high-speed switch valve, the first chamber of the double-acting single-output-rod hydraulic cylinder directly flows back to the oil tank through the first chamber of the single-output-rod hydraulic cylinder, the pressure of the double-acting single-rod hydraulic cylinder is gradually increased through the high-speed switching of the valve core, and when the pressure of the hydraulic oil reaches the preset pressure of the first pressure of the pressure sensor, the pressure of the first pressure sensor is adjusted through the control circuit d, the pressure sensor is controlled to realize the high-speed switching of the pressure sensor, and the pressure signal is transmitted to the high-speed control system through the PWM control circuit to the control circuit.
3. The shoe pressure control system based on the high-speed switch valve according to claim 1, wherein the pressure release process of the shoe hydraulic system is as follows: when the pressure signal of the first pressure sensor is higher than the preset pressure, the first pressure sensor transmits the pressure signal to the pressure controller through the control line d, the pressure controller transmits the PWM control signal to the first high-speed switch valve through the control line e according to the pressure signal of the first pressure sensor, the valve core of the first high-speed switch valve is controlled to realize high-speed switching between the left position and the right position, the control of the valve port flow of the first high-speed switch valve is realized by adjusting the duty ratio of the PWM control signal, when the opening A and the opening B of the first high-speed switch valve are in a conducting state, hydraulic oil of the second chamber of the double-acting single-rod cylinder group respectively flows into the first pressure sensor and the first high-speed switch valve, the hydraulic oil flows back to the oil tank from the opening A of the first high-speed switch valve after passing through the first high-speed switch valve, the pressure of the hydraulic oil of the second chamber of the single-rod hydraulic cylinder group is gradually reduced, when the pressure of the first high-speed switch valve reaches the preset pressure of the first pressure sensor, the pressure sensor transmits the pressure signal to the pressure controller through the double-acting control line d, the pressure controller transmits the hydraulic oil control signal to the second chamber through the control line e, the pressure controller transmits the hydraulic oil to the second chamber of the second chamber to realize the high-speed switch valve, and the duty ratio of the hydraulic valve is adjusted to realize the high-speed switching, and the pressure control valve is adjusted to the duty ratio to be zero.
4. The high-speed switch valve-based shoe pressure control system according to claim 1, wherein the accumulator pressure maintaining process is: when the pressure of the second pressure sensor is lower than the preset pressure, the second pressure sensor transmits a pressure signal to a pressure controller through a control line c, the pressure controller transmits a PWM control signal to a third high-speed switch valve through a control line g, the valve core of the third high-speed switch valve is controlled to realize high-speed switching between the left position and the right position by adjusting the duty ratio of the PWM control signal, and when an opening A and an opening B of the third high-speed switch valve are in a conducting state, hydraulic oil in a hydraulic oil source flows into the second pressure sensor through the third high-speed switch valve; the pressure controller transmits a PWM control signal to the third high-speed switch valve through a control line g when the pressure of the second pressure sensor reaches the preset pressure, and the third high-speed switch valve is controlled to be in the right position by adjusting the duty ratio of the PWM control signal to zero so as to realize the pressure maintenance of the energy accumulator.
5. The shoe pressure control system based on the high-speed switch valve according to claim 1, wherein the on-line detection process of the internal leakage of the shoe hydraulic system is as follows: the pressure sensor I transmits the pressure signal to the pressure controller through the control circuit d, the displacement sensor I and the displacement sensor II transmit the displacement signal of the double-acting single-rod hydraulic cylinder group to the pressure controller through the control circuit a and the control circuit B respectively, when the double-acting single-rod hydraulic cylinder group is leaked internally, the pressure of hydraulic oil in a second cavity is reduced, the pressure controller transmits PWM control signals to the high-speed switch valve II through the control circuit f according to the pressure signal of the pressure sensor I, the high-speed switching between the left position and the right position of a valve core of the high-speed switch valve II is controlled, when an opening A and an opening B of the high-speed switch valve II are in a conducting state, the high-pressure oil in the energy accumulator flows out through the opening A of the energy accumulator and flows out of the high-speed switch valve II respectively, the hydraulic oil flows out of the opening B of the high-speed switch valve II after passing through the high-speed switch valve II flows back into the pressure sensor I and the second cavity of the double-acting single-rod hydraulic cylinder group, and the hydraulic oil in the oil tank of the first cavity of the double-acting single-rod hydraulic cylinder group flows back directly; through the high-speed switching of the left position and the right position of the valve core of the high-speed switching valve II, the pressure of hydraulic oil in the second chamber of the double-acting single-rod hydraulic cylinder group gradually rises, when the pressure of the hydraulic oil returns to the front of internal leakage, the pressure sensor I transmits a pressure signal to the pressure controller through the control line d, the pressure controller transmits a PWM control signal to the high-speed switching valve II through the control line f, the high-speed switching valve II is controlled to be switched to the right position by adjusting the duty ratio of the PWM control signal to zero, the valve port flow of the high-speed switching valve is calculated according to the displacement signals of the displacement sensor I and the displacement sensor II, the pressure signals of the pressure sensor I and the pressure sensor II and the control signal of the high-speed switching valve II, and then the internal leakage of the double-acting single-rod hydraulic cylinder is calculated.
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