CN114033767A - Control method of brake unloading liquid-filling valve bank - Google Patents
Control method of brake unloading liquid-filling valve bank Download PDFInfo
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- CN114033767A CN114033767A CN202111066276.6A CN202111066276A CN114033767A CN 114033767 A CN114033767 A CN 114033767A CN 202111066276 A CN202111066276 A CN 202111066276A CN 114033767 A CN114033767 A CN 114033767A
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 47
- 230000009471 action Effects 0.000 claims abstract description 7
- 230000001502 supplementing effect Effects 0.000 claims abstract description 4
- 239000003921 oil Substances 0.000 claims description 164
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 239000010720 hydraulic oil Substances 0.000 claims description 12
- 230000008859 change Effects 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 claims description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/70—Electrical control in fluid-pressure brake systems by fluid-controlled switches
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
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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
- F15B13/024—Pressure relief valves
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/10—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
- F16K37/0091—For recording or indicating the functioning of a valve in combination with test equipment by measuring fluid parameters
-
- 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
- F15B2013/002—Modular valves, i.e. consisting of an assembly of interchangeable components
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Transportation (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a control method of a braking unloading liquid-filled valve group, when the pressure at an oil outlet A is reduced, a switching shuttle valve automatically switches to a low-pressure side, a control oil path of the unloading valve is communicated with the oil outlet, when the pressure is lower than the set value of the unloading valve by a certain proportion, the unloading valve is closed, a pilot-controlled reversing valve is controlled to be in a cut-off state, the pressure of a system rises at the moment, oil supply for an oil path A is started, when the pressure of the oil path A reaches the set value, the switching shuttle valve automatically switches to an oil outlet B, oil supply is carried out for an oil path B, and 2 oil paths are all charged to the set value; after the oil filling and pressure supplementing of the oil path A and the oil path B are finished, the control oil pressure of the unloading valve reaches the set value of the unloading valve, the unloading valve is opened, the hydraulic control reversing valve is controlled to be in a communicated state, the system is in an unloading state at the moment, the oil supply path P is unloaded, an oil path T is returned, and then the oil tank is returned. The invention provides a control method of a middle-braking unloading liquid filling valve group, which ensures that 2 liquid filling paths can automatically complete switching after pressure is reduced by the existence of a switching shuttle valve, and realizes the action of respectively filling liquid in the 2 paths.
Description
Technical Field
The invention relates to the field of vehicle brake control, in particular to a brake unloading liquid filling valve bank.
Background
The liquid filling scheme of the hydraulic brake system of the existing large engineering vehicle mainly adopts an accumulator liquid filling valve to keep the pressure of an accumulator within a certain range, and meets the requirements of relevant standards on a full-power energy storage type hydraulic brake system. The existing liquid filling valves mostly adopt the structural design of plate type valves, the materials of the liquid filling valves are all made of cast iron materials, the liquid filling valves are large in overall dimension, heavy in mass, complex in structure, large in assembly difficulty of parts, high in requirements on valve core machining processes, and poor in product performance consistency. The unloading/load ratio of the existing liquid charging valve product can not be changed at will after factory setting, and the liquid storage capacity of the energy accumulator is limited. Therefore, there is a need in the art for a plug-in brake charging valve set with a simple structure and easy adjustment, which automatically charges the accumulator and automatically unloads the accumulator after reaching a set pressure, so as to achieve the best braking effect.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a braking unloading liquid filling valve group which can realize the functions of automatic liquid filling of 2 oil ways and unloading after liquid filling.
In order to solve the technical problems, the invention adopts the technical scheme that:
a control method of a brake unloading liquid-filled valve group comprises a safety valve, a hydraulic control reversing valve, a pressure sensor, a first one-way valve, a second one-way valve, an unloading valve, a switching shuttle valve, a first pressure measuring joint, a second pressure measuring joint, a port P, a port T, a port A and a port B; the port P is connected with a conversion shuttle valve through a first oil way, the first oil way is provided with a first one-way valve, a second one-way valve and a pressure sensor, the conversion shuttle valve is divided into two ways to be connected with the port A and the port B, and the oil ways of the port A and the port B are respectively provided with a pressure measuring joint; the T port is connected with the unloading valve, the hydraulic control reversing valve and the safety valve through a second oil way, a third oil way is connected with the first oil way and the second oil way, and the safety valve is arranged on the third oil way; the fourth oil way is connected with the first oil way and the second oil way, the fourth oil way is provided with a hydraulic control reversing valve, the fifth oil way is connected with the first oil way and the second oil way, the fifth oil way is provided with an unloading valve, and a pilot cavity connecting point of the unloading valve is arranged between the first one-way valve and the second one-way valve; an oil inlet of the unloading valve is connected with a pilot cavity of the hydraulic control reversing valve, and the unloading valve is used as a pilot valve of the hydraulic control reversing valve to form a quick unloading valve;
hydraulic oil enters the valve group through an oil supply P port, and a pressure sensor is arranged on the path and used for measuring the pressure of the P port; when the pressure of the hydraulic oil exceeds the set value of the safety valve, the hydraulic oil can be discharged back to the oil return T port from the safety valve and then back to the oil tank;
when the pressure at the oil outlet A is reduced, the switching shuttle valve automatically switches to the low-pressure side, a control oil way of the unloading valve is communicated with the oil outlet, when the pressure is lower than the set value of the unloading valve by a certain proportion, the unloading valve is closed, the hydraulic control reversing valve is controlled to be in a stop state, the pressure of the system rises at the moment, the oil supply of the oil way A is started, when the pressure of the oil way A reaches the set value, the switching shuttle valve automatically switches to the oil outlet B, the oil is supplied to the oil way B, and until 2 oil ways are all charged to the set value;
after the oil filling and pressure supplementing of the oil path A and the oil path B are finished, the control oil pressure of the unloading valve reaches the set value of the unloading valve, the unloading valve is opened, the hydraulic control reversing valve is controlled to be in a communicated state, the system is in an unloading state at the moment, the oil supply path P is unloaded, an oil path T is returned, and then the oil tank is returned.
Preferably, the unloading valve has a plurality of pressure ratios of unloading to loading, preferably 60%.
Preferably, the upper surface of the valve body is provided with a first pressure measuring joint, a second pressure measuring joint, a safety valve, a second one-way valve and a hydraulic control reversing valve, a first side surface connected with the upper surface is provided with a conversion shuttle valve and a first one-way valve, a second side surface opposite to the first side surface is provided with an unloading valve, an oil outlet A and an oil outlet B are arranged on a third side surface, the third side surface is adjacent to the first side surface and the second side surface, and a pressure sensor, an oil return port T and an oil supply port P are arranged on a fourth side surface opposite to the third side surface.
Preferably, the front, back, left, right, up and down directions are determined by the upper surface being an upper surface and the first side being a left side and a third side, the upper surface is of a stepped structure, and a high step and a low step are respectively formed from left to right, wherein the first pressure measuring joint, the second check valve and the hydraulic control reversing valve are arranged on the upper step, the safety valve is arranged on the lower step, the first pressure measuring joint and the second pressure measuring joint are arranged on the rear portion, and the safety valve and the hydraulic control reversing valve are arranged on the front portion.
Preferably, the oil return port T is arranged above the oil supply port P, the pressure sensor is arranged on the left side of the oil return port T and the oil supply port P, and the port B is arranged on the left side of the port a; the first check valve is arranged in the front, the second check valve is arranged on the lower left side, and the switching shuttle valve is arranged on the upper right side.
The safety valve protection system does not exceed a set safety pressure; the hydraulic control reversing valve regulates the system pressure under the control of the unloading valve; the pressure sensor can measure the pressure value of the position for pressure monitoring, and the one-way valve controls the one-way circulation of the oil way; the unloading valve is used as a pilot valve of the hydraulic control reversing valve and used for controlling the hydraulic control reversing valve to start unloading after the pressure of the control system reaches a set working pressure value, and the switching shuttle valve is used for automatically switching to charge liquid after 2 paths of output oil paths are lower than the working pressure.
The safety valve is used for protecting the maximum pressure of the valve bank from exceeding a set value and protecting an oil source.
According to the braking unloading liquid filling valve bank, the unloading valve is used as a pilot valve of the hydraulic control reversing valve, reversing of the hydraulic control reversing valve is controlled through change of load pressure, reversing is continuous, and the oil source is controlled to be in an idle load state after liquid filling is completed.
In the braking unloading liquid-filling valve group, the pressure sensor is used for acquiring the system pressure and displaying the system pressure on the control panel in real time.
In the braking unloading liquid-filled valve group, the check valve is used for controlling one-way circulation of the oil way, and meanwhile, a certain pressure difference is formed between the front oil way and the rear oil way by the opening pressure of the check valve.
According to the braking unloading liquid filling valve bank, the switching shuttle valve can realize automatic switching of liquid filling actions of the two oil ways.
In the brake unloading liquid filling valve group, when the pressure of control oil of the unloading valve is lower than a selected ratio load value, the valve is closed, the controlled hydraulic control reversing valve is in a cut-off state, the system pressure is increased, liquid filling is started, and the unloading valve has multiple selectable ratios of 60%, 70% and 80%.
The safety valve, the hydraulic control reversing valve, the first one-way valve, the second one-way valve, the unloading valve and the conversion shuttle valve of the braking unloading liquid filling valve bank adopt a plug-in mounting structure and are integrated on one valve body, and the braking unloading liquid filling valve bank has the advantages of small volume, compact structure, replaceable elements and the like.
In the braking unloading liquid-filling valve bank, the 2 oil outlet paths are provided with pressure measuring joints which are used for connecting a pressure gauge and displaying the pressure of the oil path.
After adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. the invention provides a control method of a middle-braking unloading liquid filling valve group, which ensures that 2 liquid filling paths can automatically complete switching after pressure is reduced by the existence of a switching shuttle valve, and realizes the action of respectively filling liquid in the 2 paths.
2. According to the valve bank, the safety valve, the hydraulic control reversing valve, the pressure sensor, the first one-way valve, the second one-way valve, the unloading valve, the switching shuttle valve, the first pressure measuring joint, the second pressure measuring joint, the P port, the T port, the A port, the B port and other parts are integrated on one base body, the valve bank is lighter in weight, more compact in structure, more in reaction and higher in response precision, and the functions of automatic liquid filling of 2 oil paths and unloading after liquid filling are achieved.
3. The whole of a plurality of components of the invention adopts plug-in type integrated installation, the structure is more compact, the weight is lighter, and the maintenance and overhaul are simple.
4. The hydraulic control reversing valve controlled by the unloading valve ensures that the situation of over-high pressure or insufficient pressure does not occur in the liquid filling process.
5. The valve seat can automatically realize low-pressure liquid filling action through the switching shuttle valve, and automatically realize high-pressure unloading action through the unloading valve controlling the hydraulic control reversing valve.
6. The oil inlet path of the invention is provided with a pressure sensor for detecting the system pressure in real time.
7. The 2 oil outlet paths are provided with pressure measuring joints which are used for connecting pressure gauges and detecting the pressure of the oil paths.
8. The selected cartridge unloading valve has a plurality of unloading/load ratios of 60%, 70% and 80% which are selectable, different unloading ratios 9 of the brake unloading liquid-filled valve group can be realized by replacing unloading valves with different ratios, and the oil inlet circuit of the invention is provided with a safety valve for protecting an oil source.
Drawings
Fig. 1 is a schematic structure diagram of a brake unloading liquid filling valve group of the invention.
Fig. 2 is a left side schematic view of a brake unloading charging valve set of the present invention.
Fig. 3 is a right side schematic view of a brake unloading charging valve set of the present invention.
In the above drawings:
1. a safety valve; 2. a hydraulic control directional control valve; 3. a first check valve; 4. a pressure sensor; 5. a second one-way valve; 6. an unloading valve; 7. a shuttle valve is switched; 8. a first pressure tap; 9. a second pressure tap; 10. a valve body.
Detailed Description
The invention will be further described with reference to the accompanying drawings to assist in understanding the invention.
Fig. 1-3 disclose a brake unloading charge valve pack of the present invention. As shown in fig. 1-3, a brake unloading liquid-filled valve group comprises a valve body 10, wherein a safety valve 1, a hydraulic control reversing valve 2, a pressure sensor 4, a first one-way valve 3, a second one-way valve 5, an unloading valve 6, a switching shuttle valve 7, a first pressure measuring joint 8, a second pressure measuring joint 9, a port P, a port T, a port a and a port B are arranged on the valve body; the port P is connected with a conversion shuttle valve 7 through a first oil way, a first check valve 3, a second check valve 5 and a pressure sensor 4 are arranged on the first oil way, the conversion shuttle valve 7 is divided into two ways to be connected with a port A and a port B, a second measuring point 9 is arranged on the oil way of the port A, and a first measuring point 8 is arranged on the oil way of the port B; the T port is connected with an unloading valve 6, a hydraulic control reversing valve 2 and a safety valve 1 through a second oil way, a third oil way is connected with a first oil way and a second oil way, the safety valve 1 is arranged on the third oil way, a fourth oil way is connected with the first oil way and the second oil way, the hydraulic control reversing valve 2 is arranged on the fourth oil way, a fifth oil way is connected with the first oil way and the second oil way, the unloading valve 6 is arranged on the fifth oil way, and a pilot cavity connecting point of the unloading valve 6 is arranged between a first check valve 3 and a second check valve 5; an oil inlet of the unloading valve 6 is connected with a pilot cavity of the hydraulic control reversing valve 2, and the unloading valve 6 is used as a pilot valve of the hydraulic control reversing valve 2 to form a quick unloading valve;
the hydraulic control valve is characterized in that a first pressure measuring joint 8, a second pressure measuring joint 9, a safety valve 1, a second one-way valve 5 and a hydraulic control reversing valve 2 are arranged on the upper surface of the valve body 10, a first side surface connected with the upper surface is provided with a conversion shuttle valve 7 and a first one-way valve 3, a second side surface opposite to the first side surface is provided with an unloading valve 6, an oil outlet A and an oil outlet B are arranged on a third side surface, the third side surface is adjacent to the first side surface and the second side surface, and a pressure sensor 4, an oil return port T and an oil supply port P are arranged on a fourth side surface opposite to the third side surface.
The invention provides a middle brake unloading liquid filling valve group, which ensures that 2 liquid filling paths can be automatically switched after pressure is reduced by the existence of a switching shuttle valve 7, so as to realize the action of respectively filling the 2 liquid filling paths.
Preferably, the safety valve, the hydraulic control reversing valve, the first one-way valve, the second one-way valve, the unloading valve and the conversion shuttle valve are installed in a plug-in mounting type integration mode, the disassembly and the assembly are convenient, and the maintenance and the overhaul are simple.
Preferably, the front, back, left, right, up and down directions are determined by the upper surface being an upper surface and the first side being a left side and a third side, the upper surface is of a stepped structure, and the left side and the right side are respectively a high step and a low step, wherein the first pressure measuring joint 8, the second pressure measuring joint 9, the second check valve 5 and the pilot operated directional control valve 2 are arranged on the upper step, the safety valve 1 is arranged on the lower step, wherein the first pressure measuring joint and the second pressure measuring joint are arranged on the rear portion, and the safety valve and the pilot operated directional control valve are arranged on the front portion.
Preferably, the oil return port T is arranged above the oil supply port P, the pressure sensor is arranged on the left side of the oil return port T and the oil supply port P, and the port B is arranged on the left side of the port a; the first check valve is arranged in the front, the second check valve is arranged on the lower left side, and the switching shuttle valve is arranged on the upper right side.
According to the invention, through the arrangement of all the components, the arrangement of the valve body saves space, and the structure is more compact. And through the layout and the arrangement of all the parts, the pipeline connection layout is simplified, and the hidden danger of brake oil leakage is reduced.
The selected cartridge unloading valve has a plurality of unloading/loading ratios of 60%, 70% and 80% which can be selected, and different unloading ratios of the brake unloading liquid-filled valve group can be realized by replacing unloading valves with different ratios.
Preferably, the safety valve protection system does not exceed a set safety pressure; the hydraulic control reversing valve regulates the system pressure under the control of pilot oil; the pressure sensor can detect the pressure value of the system in real time, and the one-way valve controls the one-way circulation of the oil way; the unloading valve is used for controlling the hydraulic control reversing valve to start unloading after the system pressure reaches a set working pressure value, and the switching shuttle valve is used for automatic liquid filling after the 2-path oil path is lower than the working pressure. According to the pilot ratio of the selected unloading valve, the automatic liquid filling can be realized after the selected ratio is lower than the set value, and the automatic unloading function can be realized after the set pressure is reached.
The specific mode for realizing the functions of the braking unloading liquid-filling valve group is as follows:
hydraulic oil enters the valve group through an oil supply P port, and a pressure sensor is arranged on the path and used for measuring the pressure of the P port; when the pressure of the hydraulic oil exceeds the set value of the safety valve 1, the hydraulic oil can be discharged back to the oil return T port from the safety valve 1 and then back to the oil tank;
the hydraulic oil enters the valve group through an oil supply port P, passes through the first one-way valve 3, then passes through the second one-way valve 5, and finally passes through the conversion shuttle valve 7 to output two paths of hydraulic oil, namely an oil outlet A and an oil outlet B, the oil path is provided with a pressure measuring joint 8 and a pressure measuring joint 9, and the two paths of hydraulic oil are connected with an energy accumulator and a brake.
One way of control oil is arranged between the first one-way valve 3 and the second one-way valve 5 to control the opening and closing of the unloading valve 6, the unloading valve 6 has a plurality of unloading and loading pressure ratios, in this case, 60% is taken as an example, the unloading valve 6 is used as a pilot valve of the hydraulic control reversing valve 2, and the hydraulic control reversing valve 2 is positioned between an oil supply P port and an oil return T port.
When the pressure at the oil outlet A is reduced, the switching shuttle valve 7 is automatically switched to the low-pressure side, the control oil way of the unloading valve 6 is communicated with the oil outlet A, when the pressure is lower than 60% of the set value of the unloading valve 6, the unloading valve 6 is closed, the pilot-controlled reversing valve 2 is controlled to be in a stop state, the system pressure rises at the moment, oil supply for the oil way A is started, when the pressure of the oil way A reaches the set value, the switching shuttle valve is automatically switched to the oil outlet B, oil supply is carried out for the oil way B, and the pressure of 2 oil ways is increased to the set value.
After the oil filling and pressure supplementing of the oil path A and the oil path B are finished, the control oil pressure of the unloading valve 6 reaches the set value of the unloading valve 6, the unloading valve 6 is opened, the hydraulic control reversing valve 2 is controlled to be in a communicated state, the system is in an unloading state at the moment, the oil path T is formed by unloading the oil supply path P, and then the oil tank returns.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A control method of a brake unloading liquid-filled valve group comprises a safety valve, a hydraulic control reversing valve, a pressure sensor, a first one-way valve, a second one-way valve, an unloading valve, a switching shuttle valve, a first pressure measuring joint, a second pressure measuring joint, a port P, a port T, a port A and a port B; the port P is connected with a conversion shuttle valve through a first oil way, the first oil way is provided with a first one-way valve, a second one-way valve and a pressure sensor, the conversion shuttle valve is divided into two ways to be connected with the port A and the port B, and the oil ways of the port A and the port B are respectively provided with a pressure measuring joint; the T port is connected with the unloading valve, the hydraulic control reversing valve and the safety valve through a second oil way, a third oil way is connected with the first oil way and the second oil way, and the safety valve is arranged on the third oil way; the fourth oil way is connected with the first oil way and the second oil way, the fourth oil way is provided with a hydraulic control reversing valve, the fifth oil way is connected with the first oil way and the second oil way, the fifth oil way is provided with an unloading valve, and a pilot cavity connecting point of the unloading valve is arranged between the first one-way valve and the second one-way valve; an oil inlet of the unloading valve is connected with a pilot cavity of the hydraulic control reversing valve, and the unloading valve is used as a pilot valve of the hydraulic control reversing valve to form a quick unloading valve;
hydraulic oil enters the valve group through an oil supply P port, and a pressure sensor is arranged on the path and used for measuring the pressure of the P port; when the pressure of the hydraulic oil exceeds the set value of the safety valve, the hydraulic oil can be discharged back to the oil return T port from the safety valve and then back to the oil tank;
when the pressure at the oil outlet A is reduced, the switching shuttle valve automatically switches to the low-pressure side, a control oil way of the unloading valve is communicated with the oil outlet, when the pressure is lower than the set value of the unloading valve by a certain proportion, the unloading valve is closed, the hydraulic control reversing valve is controlled to be in a stop state, the pressure of the system rises at the moment, the oil supply of the oil way A is started, when the pressure of the oil way A reaches the set value, the switching shuttle valve automatically switches to the oil outlet B, the oil is supplied to the oil way B, and until 2 oil ways are all charged to the set value;
after the oil filling and pressure supplementing of the oil path A and the oil path B are finished, the control oil pressure of the unloading valve reaches the set value of the unloading valve, the unloading valve is opened, the hydraulic control reversing valve is controlled to be in a communicated state, the system is in an unloading state at the moment, the oil supply path P is unloaded, an oil path T is returned, and then the oil tank is returned.
2. A method of controlling a brake unloading charging valve pack according to claim 1, wherein the unloading valve has a plurality of unloading to loading pressure ratios, preferably 60%.
3. A method of controlling a brake unloader fill valve set according to claim 1, wherein the relief valve protection system does not exceed a set relief pressure; the hydraulic control reversing valve regulates the system pressure under the control of the unloading valve; the pressure sensor can measure the pressure value of the position for pressure monitoring, and the one-way valve controls the one-way circulation of the oil way; the unloading valve is used as a pilot valve of the hydraulic control reversing valve and used for controlling the hydraulic control reversing valve to start unloading after the pressure of the control system reaches a set working pressure value, and the switching shuttle valve is used for automatically switching to charge liquid after 2 paths of output oil paths are lower than the working pressure.
4. The method for controlling the brake unloading liquid-filled valve group according to claim 1, wherein the unloading valve is used as a pilot valve of a hydraulic control reversing valve, the reversing of the hydraulic control reversing valve is controlled through the change of load pressure, the reversing is continuous, and an oil source is controlled to be in an idle state after the liquid filling action is completed.
5. A method of controlling a brake-unloading liquid-filled valve group as claimed in claim 1, comprising an integrated valve body, wherein a first pressure measuring joint, a second pressure measuring joint, a safety valve, a second check valve and a hydraulic control reversing valve are provided on the upper surface of the valve body, a switching shuttle valve and a first check valve are provided on a first side surface connected to the upper surface, an unloading valve is provided on a second side surface opposite to the first side surface, an oil outlet a and an oil outlet B are provided on a third side surface adjacent to the first side surface and the second side surface, and a pressure sensor, an oil return port T and an oil supply port P are provided on a fourth side surface opposite to the third side surface.
6. The method of controlling a brake-unloading charge valve group according to claim 4, wherein the front, rear, left, right, and up-down directions are determined with the upper surface being an upper surface and the first side being a left side and a third side being a front surface, the upper surface has a stepped structure with a high step and a low step from left to right, respectively, wherein the first pressure measuring tap, the second check valve, and the pilot operated directional control valve are provided on the upper step, and the safety valve is provided on the lower step, wherein the first pressure measuring tap, the second pressure measuring tap are provided on the rear portion, and the safety valve and the pilot operated directional control valve are provided on the front portion.
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| CN114033767B (en) | 2023-12-12 |
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