CN114033767B - Control method of brake unloading liquid filling valve group - Google Patents
Control method of brake unloading liquid filling valve group Download PDFInfo
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- CN114033767B CN114033767B CN202111066276.6A CN202111066276A CN114033767B CN 114033767 B CN114033767 B CN 114033767B CN 202111066276 A CN202111066276 A CN 202111066276A CN 114033767 B CN114033767 B CN 114033767B
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000007788 liquid Substances 0.000 title abstract description 33
- 230000009471 action Effects 0.000 claims abstract description 8
- 239000003921 oil Substances 0.000 claims description 164
- 238000006243 chemical reaction Methods 0.000 claims description 19
- 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
- 239000012530 fluid Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 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
- 238000005516 engineering process Methods 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000004044 response 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
-
- 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
-
- 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
-
- 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
Landscapes
- 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 filling 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 way of an unloading valve is communicated with the oil outlet, when the pressure is lower than a set value of the unloading valve by a certain proportion, the unloading valve is closed, a hydraulic control reversing valve is controlled to be in a cut-off state, at the moment, the pressure of a system rises, oil supply to 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 an oil outlet B, oil is supplied to the oil way B until 2 oil ways are all pressurized to the set value; when the oil circuit A and the oil circuit B are filled with oil and the pressure is completed, 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 communicating state, the system is in an unloading state, the oil supply circuit P is unloaded, the oil circuit T is returned, and then the oil circuit is returned. According to the control method of the braking unloading liquid filling valve group, through the existence of the switching shuttle valve, 2 liquid filling paths can be automatically switched according to the fact that the pressure is reduced, and 2 paths of liquid filling actions are achieved respectively.
Description
Technical Field
The invention relates to the field of vehicle brake control, in particular to a brake unloading liquid filling valve group.
Background
The charging scheme of the hydraulic brake system of the large-scale industrial vehicle mainly adopts an accumulator charging valve to keep the pressure of the accumulator within a certain range, thereby meeting the requirements of related standards on the full-power energy-storage type hydraulic brake system. Most of the existing liquid filling valves adopt the structural design of plate valves, cast iron materials are adopted as the materials, the external dimension is large, the quality is heavy, the structure is complex, the assembly difficulty of parts is large, the requirements on the valve core processing technology are high, and the product performance consistency is poor. The unloading/loading ratio of the existing liquid filling valve product cannot be changed at will after delivery setting, so that the liquid storage capacity of the accumulator is limited. Therefore, there is an urgent need in the art for a plug-in type brake charging valve set with a simple structure and convenient adjustment, which automatically realizes the charging and charging of an accumulator, and automatically unloads after the set pressure is reached, so as to achieve the best braking effect.
In view of this, the present invention has been made.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art, and provides a brake unloading liquid filling valve group which can realize the functions of automatic liquid filling of 2 oil ways and unloading after liquid filling is finished.
In order to solve the technical problems, the invention adopts the basic conception of the technical scheme that:
a control method of a brake unloading and filling 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 conversion shuttle valve, a first pressure measuring joint, a second pressure measuring joint, a P port, a T port, an A port and a B port; the port P is connected with a conversion shuttle valve through a first oil way, a first one-way valve, a second one-way valve and a pressure sensor are arranged on the first oil way, the conversion shuttle valve is connected with the port A and the port B in two ways, and pressure measuring connectors are respectively arranged on the oil ways of the port A and the port B; 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, an unloading valve is arranged on the fifth oil way, 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 rapid unloading valve;
hydraulic oil enters the valve group through an oil supply P port, and the pressure sensor is arranged on the valve group and is 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 drained back to the oil return port T from the safety valve and then returned to the oil tank;
when the pressure at the oil outlet A is reduced, the switching shuttle valve automatically switches to a low pressure side, a control oil way of the unloading valve is communicated with the oil outlet, when the pressure is lower than a 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 cut-off state, at the moment, the system pressure rises to start oil supply to the oil way A, and when the pressure of the oil way A reaches the set value, the switching shuttle valve automatically switches to the oil outlet B to supply oil to the oil way B until 2 oil ways are all pressurized to the set value;
when the oil circuit A and the oil circuit B are filled with oil and the pressure is completed, 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 communicating state, the system is in an unloading state, the oil supply circuit P is unloaded, the oil circuit T is returned, and then the oil circuit is returned.
Preferably, the unloading valve has a plurality of unloading to loading pressure ratios, preferably 60%.
Preferably, a first pressure measuring joint, a second pressure measuring joint, a safety valve, a second one-way valve and a hydraulic control reversing valve are arranged on the upper surface of the valve body, a conversion shuttle valve and a first one-way valve are arranged on the first side surface connected with the upper surface, an unloading valve is arranged on the second side surface opposite to the first side surface, 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-rear, left-right, up-down and down directions are determined by taking the upper surface as an upper surface, the first side surface as a left side surface and the front of a third side surface, the upper surface is of a ladder structure, a high ladder and a low ladder are respectively arranged from left to right, wherein the first pressure measuring connector, the second one-way valve and the hydraulic control reversing valve are arranged on the upper ladder, the safety valve is arranged on the lower ladder, the first pressure measuring connector, the second pressure measuring connector are arranged at the rear part, and the safety valve and the hydraulic control reversing valve are arranged at the front part.
Preferably, the oil return port T is arranged at the upper part of the oil supply port P, the pressure sensor is arranged at the left sides of the oil return port T and the oil supply port P, and the port B is arranged at the left side of the port A; the first check valve is arranged in front, the second check valve is arranged at the lower left side, and the conversion shuttle valve is arranged at 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 where the pressure sensor is positioned for pressure monitoring, and the one-way valve controls one-way circulation of the oil way; the unloading valve is used as a pilot valve of the hydraulic control reversing valve and is used for controlling the hydraulic control reversing valve to begin unloading after the pressure of the system reaches a set working pressure value, and the switching shuttle valve is used for automatically switching liquid filling after the output 2 paths of oil paths are lower than the working pressure.
The brake unloading liquid filling valve group is characterized in that the safety valve is used for protecting the maximum pressure of the valve group from exceeding a set value and protecting an oil source.
According to the braking unloading liquid filling valve group, the unloading valve is used as a pilot valve of the liquid control reversing valve, the reversing of the liquid control reversing valve is controlled through the change of load pressure, the reversing is continuous, and the oil source is controlled to be in an idle state after the liquid filling action is completed.
The brake unloading liquid filling valve group is characterized in that the pressure sensor is used for collecting the system pressure and displaying the system pressure on the control panel in real time.
The braking unloading liquid filling valve group is characterized in that the check valve is used for controlling one-way circulation of the oil paths, and meanwhile, the opening pressure of the check valve enables a certain pressure difference to be formed between the front oil path and the rear oil path.
According to the brake unloading liquid filling valve group, the switching shuttle valve can realize automatic switching of liquid filling actions of two oil ways.
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, the filling of the fluid is started, and the unloading valve has more than 60%, 70% and 80% of selectable ratios.
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 integrated on one valve body by adopting a plug-in structure, and the brake unloading and filling valve has the advantages of small volume, compact structure, replaceable elements and the like.
According to the brake unloading liquid filling valve group, 2 oil outlet paths are provided with pressure measuring connectors and are used for being connected with a pressure gauge to display the oil path pressure.
After the technical scheme is adopted, compared with the prior art, the invention has the following beneficial effects:
1. according to the control method of the braking unloading liquid filling valve group, through the existence of the switching shuttle valve, 2 liquid filling paths can be automatically switched according to the fact that the pressure is reduced, and 2 paths of liquid filling actions are achieved respectively.
2. The valve group integrates 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 conversion shuttle valve, a first pressure measuring joint, a second pressure measuring joint, a P port, a T port, an A port, a B port and other parts on one base body, has lighter weight, more compact structure, more reaction blocks and higher response precision, and can realize the functions of automatic filling of 2 oil ways and unloading after the completion of filling.
3. The components of the invention are integrally installed by plug-in type, so that the structure is more compact, the weight is lighter, and the maintenance and repair are simple.
4. According to the invention, the hydraulic control reversing valve controlled by the unloading valve ensures that the condition of too high or insufficient pressure in the filling process can not occur.
5. The valve seat can automatically realize low-pressure liquid filling action through the change-over shuttle valve, and the unloading valve controls the hydraulic control reversing valve to automatically realize high-pressure unloading action.
6. The oil inlet path is provided with a pressure sensor for detecting the system pressure in real time.
7. The 2 oil outlet ways are provided with pressure measuring joints which are used for connecting with a pressure gauge and detecting the pressure of an oil way.
8. The plug loading and unloading valve has 60%, 70% and 80% of unloading/loading ratio, the different unloading ratio 9 of the braking unloading and filling valve group can be realized by replacing the unloading valves with different ratios, and the oil inlet path of the invention is provided with a safety valve for protecting oil sources.
Drawings
FIG. 1 is a schematic block diagram of a brake unloading fluid-filled valve set of the present invention.
FIG. 2 is a left side schematic view of the brake unloading and charging valve set of the present invention.
FIG. 3 is a right-hand schematic view of the brake unloading valve set of the present invention.
In the above figures:
1. a safety valve; 2. a hydraulically controlled reversing valve; 3. a first one-way valve; 4. a pressure sensor; 5. a second one-way valve; 6. an unloading valve; 7. a switching shuttle valve; 8. a first pressure tap; 9. a second pressure tap; 10. and a valve body.
Detailed Description
The invention will be further described with reference to the drawings to aid in understanding the invention.
Fig. 1-3 disclose a brake unloading and charging valve set of the present invention. As shown in fig. 1-3, a brake unloading and charging 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 shuttle switching 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 one-way valve 3, a second one-way valve 5 and a pressure sensor 4 are arranged on the first oil way, the conversion shuttle valve 7 is connected with a port A and a port B in two ways, 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 the first check valve 3 and the second check valve 5; an oil inlet of the unloading valve 6 is connected with a pilot cavity of the pilot operated directional control valve 2, and the unloading valve 6 is used as a pilot valve of the pilot operated directional control valve 2 to form a quick unloading valve;
the upper surface of the valve body 10 is provided with 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, 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 brake unloading liquid filling valve group, which ensures that 2 liquid filling paths can be automatically switched according to the fact that the pressure is reduced by the aid of a conversion shuttle valve 7, and realizes the action of 2 paths of liquid filling respectively.
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 integrally installed by adopting plug-in mounting, so that 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 convenient to assemble and disassemble and simple to maintain and overhaul.
Preferably, the front-back, left-right, up-down directions are determined by taking the upper surface as an upper surface, the first side surface as a left side surface and the front of a third side surface, the upper surface is of a ladder structure, a high ladder and a low ladder are respectively arranged from left to right, wherein the first pressure measuring connector 8, the second pressure measuring connector 9, the second one-way valve 5 and the hydraulic control reversing valve 2 are arranged on the upper ladder, the safety valve 1 is arranged on the lower ladder, the first pressure measuring connector and the second pressure measuring connector are arranged at the rear, and the safety valve and the hydraulic control reversing valve are arranged at the front.
Preferably, the oil return port T is arranged at the upper part of the oil supply port P, the pressure sensor is arranged at the left sides of the oil return port T and the oil supply port P, and the port B is arranged at the left side of the port A; the first check valve is arranged in front, the second check valve is arranged at the lower left side, and the conversion shuttle valve is arranged at the upper right side.
According to the invention, through the arrangement of all the parts, the arrangement of the valve body saves space and has a more compact structure. And through the overall arrangement and the setting of each part, simplified the piping connection overall arrangement, reduced brake fluid and revealed hidden danger.
The plug loading and unloading valve selected by the invention has a plurality of unloading/loading ratios of 60%, 70% and 80%, and can realize different unloading ratios of the braking unloading liquid filling valve group 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 the pilot oil; the pressure sensor can detect the pressure value of the system in real time, and the one-way valve controls one-way circulation of the oil circuit; the unloading valve is used for controlling the hydraulic control reversing valve to begin unloading after the system pressure reaches the set working pressure value, and the switching shuttle valve is used for automatically filling liquid after the 2-way oil way is lower than the working pressure. According to the pilot ratio of the selected unloading valve, the automatic filling after the ratio is lower than the selected ratio of the set value can be realized, and the automatic unloading function after the set pressure is reached can be realized.
The specific mode of realizing the functions of the brake unloading and filling valve group is as follows:
hydraulic oil enters the valve group through an oil supply P port, and the pressure sensor is arranged on the valve group and is 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 drained back to the oil return port T from the safety valve 1 and then returned to the oil tank;
hydraulic oil enters the valve group through an oil supply P port, passes through a first one-way valve 3, then passes through a second one-way valve 5, finally passes through a conversion shuttle valve 7 to output two paths of hydraulic oil, namely an oil outlet A and an oil outlet B, wherein a pressure measuring joint 8 and a pressure measuring joint 9 are arranged on an oil path, and an energy accumulator and a brake are connected behind the two paths of hydraulic oil.
Between the first check valve 3 and the second check valve 5 there is a control oil controlling the opening and closing of the unloading valve 6, the unloading valve 6 has a plurality of unloading to load pressure ratios, here for example 60%, the unloading valve 6 is used as a pilot valve of the pilot operated directional valve 2, and the pilot operated directional valve 2 is located between the oil supply P port and the 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, a control oil way of the unloading valve 6 is communicated with the oil outlet A, when the pressure is lower than 60% of a set value of the unloading valve 6, the unloading valve 6 is closed, the pilot operated reversing valve 2 is controlled to be in a cut-off state, the system pressure is increased at the moment, oil supply to 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 is supplied to the oil way B, and until 2 oil ways are all pressurized to the set value.
When the oil circuit A and the oil circuit B are filled with oil and the pressure is completed, 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 control hydraulic control reversing valve 2 is in a communication state, the system is in an unloading state, the oil circuit T is formed when the oil supply circuit P is unloaded, and then the oil returns to the oil tank.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (5)
1. A control method of a brake unloading and filling 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 conversion shuttle valve, a first pressure measuring joint, a second pressure measuring joint, a P port, a T port, an A port and a B port; the port P is connected with a conversion shuttle valve through a first oil way, a first one-way valve, a second one-way valve and a pressure sensor are arranged on the first oil way, the conversion shuttle valve is connected with the port A and the port B in two ways, and pressure measuring connectors are respectively arranged on the oil ways of the port A and the port B; 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, an unloading valve is arranged on the fifth oil way, 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 rapid unloading valve;
hydraulic oil enters the valve group through an oil supply P port, and the pressure sensor is arranged on the valve group and is 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 drained back to the oil return port T from the safety valve and then returned to the oil tank;
when the pressure at the oil outlet A is reduced, the switching shuttle valve automatically switches to a low pressure side, a control oil way of the unloading valve is communicated with the oil outlet, when the pressure is lower than a 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 cut-off state, at the moment, the system pressure rises to start oil supply to the oil way A, and when the pressure of the oil way A reaches the set value, the switching shuttle valve automatically switches to the oil outlet B to supply oil to the oil way B until 2 oil ways are all pressurized to the set value;
when the oil circuit A and the oil circuit B are filled with oil and the pressure is completed, 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 communicating state, the system is in an unloading state, the oil supply circuit P is unloaded, the oil circuit T is returned, and then the oil circuit is returned.
2. The control method of a brake unloading and filling valve set according to claim 1, wherein 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 where the pressure sensor is positioned for pressure monitoring, and the one-way valve controls one-way circulation of the oil way; the unloading valve is used as a pilot valve of the hydraulic control reversing valve and is used for controlling the hydraulic control reversing valve to begin unloading after the pressure of the control system reaches a set working pressure value, and the switching shuttle valve is used for automatically switching filling after the output 2 paths of oil paths are lower than the working pressure.
3. The control method of a brake unloading and filling valve set 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 by the change of load pressure, the reversing has continuity, and the oil source is controlled to be in an idle state after the filling action is completed.
4. The control method of a brake unloading and filling valve group according to claim 1, comprising an integrated valve body, wherein a first pressure measuring joint, a second pressure measuring joint, a safety valve, a second one-way valve and a hydraulic control reversing valve are arranged on the upper surface of the valve body, a switching shuttle valve and a first one-way valve are arranged on a first side surface connected with the upper surface, an unloading valve is arranged on a second side surface opposite to the first side surface, 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.
5. The control method of the brake unloading and filling valve group according to claim 3, wherein the front, rear, left, right, up and down directions are determined by taking an upper surface as an upper surface, taking a first side surface as a left side surface and taking a third side surface as a front surface, taking a ladder structure as an upper surface, taking a high ladder and a low ladder from left to right respectively, wherein a first pressure measuring connector, a second one-way valve and a hydraulic control reversing valve are arranged on the upper ladder, a safety valve is arranged on the lower ladder, wherein the first pressure measuring connector, the second pressure measuring connector are arranged at the rear part, and the safety valve and the hydraulic control reversing valve are arranged at the front part.
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