CN113844490A - Air backup braking system, braking method and rail transit vehicle - Google Patents
Air backup braking system, braking method and rail transit vehicle Download PDFInfo
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- CN113844490A CN113844490A CN202111185036.8A CN202111185036A CN113844490A CN 113844490 A CN113844490 A CN 113844490A CN 202111185036 A CN202111185036 A CN 202111185036A CN 113844490 A CN113844490 A CN 113844490A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61H—BRAKES OR OTHER RETARDING DEVICES SPECIALLY ADAPTED FOR RAIL VEHICLES; ARRANGEMENT OR DISPOSITION THEREOF IN RAIL VEHICLES
- B61H11/00—Applications or arrangements of braking or retarding apparatus not otherwise provided for; Combinations of apparatus of different kinds or types
- B61H11/06—Applications or arrangements of braking or retarding apparatus not otherwise provided for; Combinations of apparatus of different kinds or types of hydrostatic, hydrodynamic, or aerodynamic brakes
- B61H11/10—Aerodynamic brakes with control flaps, e.g. spoilers, attached to the vehicles
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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
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- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Braking Systems And Boosters (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The invention discloses an air backup braking system, a braking method and a rail transit vehicle, wherein an air supplementing mode or an air non-supplementing mode of air backup braking is selected according to a backup actual mode, and when the air non-supplementing mode is adopted, a front blocking valve of a relay valve can be controlled to be closed or opened according to pressure change of a balance air cylinder controlled by a backup braking valve, so that the air non-supplementing function in the air backup braking mode is realized, and the reliability and the usability of the conventional air backup braking system are improved.
Description
Technical Field
The invention relates to the field of locomotives such as electric power locomotives and internal combustion locomotives, in particular to an air backup braking system, an air backup braking method and a rail transit vehicle.
Background
At present, the conventional locomotive is provided with an air backup brake system, and the system is an emergency operation system after an electric pneumatic brake failure and can realize the control of a train pipe of the vehicle. Because the pressurize of the backup braking mode of present locomotive configuration after the braking is the state of making up the wind, cause the vehicle to alleviate easily when pulling cargo vehicle (cargo vehicle distribution valve is once only alleviates the distribution valve), produce the swift and graceful risk, lead to backup braking mode practicality not strong, influence locomotive operating efficiency.
Disclosure of Invention
The invention aims to solve the technical problem that in order to overcome the defects in the prior art, the invention provides the air backup braking system, the braking method and the rail transit vehicle, and the relay valve front blocking valve is controlled to be closed or opened, so that the non-air-supplementing function in the air backup braking mode is realized, and the reliability and the usability of the existing air backup braking system are improved.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: an air backup brake system comprises a brake mode conversion device, wherein a first output port of the brake mode conversion device is communicated with a first control port of a first switching valve through a first switching passage; the second output port of the braking mode switching device is respectively communicated with the second switching valve control port and the relay valve control port through a second switching passage and a third switching passage which are connected in parallel; the input port and the output port of the first switching valve are respectively communicated with a main wind source of the relay valve and the input port of the relay valve; the relay valve output port is communicated with the second switching valve input port; the output port of the second switching valve is communicated with a train pipe; the switching circuit also comprises a fourth switching path; the fourth switching passage includes a pressure valve; the pressure valve input port is communicated with the third switching channel input end; the pressure valve output port is communicated with the first switching passage; the first control port and the second control port of the pressure valve are communicated with the third switching passage; and the second control port of the pressure valve is communicated with the buffer air cylinder.
The invention is provided with the pressure valve, the passage of the second control port of the fourth switching valve can be controlled by the pressure valve, the first switching valve is controlled by the fourth switching valve to close or open the passage of the total air and the air inlet of the relay valve, the non-air-supplementing function of the backup brake is realized, the output of the relay valve is communicated with the train pipe, the charging and the exhausting of the backup balance air cylinder of the backup brake valve are realized, the pressure of the train pipe is finally controlled, and the reliability and the usability of the existing air backup brake system are improved.
The first switching passage includes a third switching valve; the third switching valve control port is communicated with the first output port of the braking mode conversion device; the input port of the third switching valve is communicated with the output port of the pressure valve; the output port of the third switching valve is communicated with the first control port of the fourth switching valve; the second control port of the fourth switching valve is communicated with the equalizing reservoir; and the input port of the fourth switching valve is communicated with a main air pipe, and the output port of the fourth switching valve is communicated with the first control port of the first switching valve.
The third switching path includes a backup brake valve; the input port of the backup brake valve is communicated with the second output port of the brake mode conversion device through a pressure regulating device; the output port of the backup brake valve is connected with the control port of the relay valve and the balance air cylinder; the input port of the pressure valve is connected between the pressure regulating device and the second output port of the braking mode conversion device through a gas circuit; and the first control port and the second control port of the pressure valve are connected between the output port of the backup brake valve and the control port of the relay valve through gas paths.
And the second control port of the pressure valve is connected between the output port of the backup brake valve and the control port of the relay valve through a flow limiting device. When the pressure reducing rate of the first control port of the pressure valve exceeds the set common brake pressure reducing rate, the pressure valve acts to communicate the input port and the output port of the pressure valve, and the total air is cut off from the first switching valve through the third switching valve and the fourth switching valve, so that the function of cutting off and supplementing the air is realized.
The backup braking mode conversion device has three states of a normal position, an air position air supplementing mode and an air position non-air supplementing mode. And when the main air source is cut off in a normal position, the main air source is communicated with a passage for exhausting air from a control port of the air supply input switching valve and a control port of the relay valve output switching valve, so that the output of the backup relay valve is cut off and the train pipe cannot be controlled.
Under the air position non-air-supplementing mode, the brake mode conversion device communicates the total air with the passage of the control port of the air-supplementing input switching valve and the passage of the control port of the relay valve output switching valve, so that the air-supplementing input switching valve (a third switching valve) communicates with the pressure valve (namely the pressure valve) in the brake state to control the passage of the second control port of the backup block switching valve (a fourth switching valve), the pneumatic control switching valve 1 (a first switching valve) is controlled by the backup block switching valve to close or open the passage of the total air and the air inlet of the relay valve, the non-air-supplementing function of backup brake is realized, the output of the relay valve is communicated with a train pipe, the backup balance air cylinder of the backup brake valve is charged and discharged, and the pressure of the train pipe is finally controlled. In the air level air supplement mode, the brake mode conversion device communicates the total air with a passage of a relay valve output switching valve control port, the pressure of the air supplement input into the switching valve control port is exhausted, the passage of the air exhaust of the switching valve is blocked before the control port of the pneumatic control switching valve 1 is reserved, and the air supplement function of the relay valve during backup braking is realized.
The invention also provides a rail transit vehicle which adopts the air backup braking system.
As an inventive concept, the present invention also provides a method of implementing air backup braking using the above air backup braking system, which includes:
when the braking mode conversion device works at a normal position, the first switching channel and the fourth switching channel are cut off, and the second switching channel and the third switching channel are connected;
when the braking mode conversion device works in an air position non-air-supply mode, the first switching channel, the second switching channel, the third switching channel and the fourth switching channel are all communicated, the equalizing air cylinder is filled with air, the equalizing pressure is increased, and the relay valve continuously supplies air; when the balance air cylinder is fully finished, pressure reduction is started, and when the set value of the pressure reduction rate of the service brake is reached, the relay valve is cut off to supplement air;
when the braking mode conversion device works in an air level air supplementing mode, the first switching passage is cut off, and the pressure of the first control port of the first switching valve is exhausted through the fourth switching valve, so that air supplementing is realized.
As an inventive concept, the present invention also provides a method for implementing no air supplement in an air backup braking mode by using the air backup braking system, which includes: when the braking mode conversion device works in an air position non-air-supply mode, the first switching channel, the second switching channel, the third switching channel and the fourth switching channel are all communicated, the equalizing air cylinder is filled with air, the equalizing pressure is increased, and the relay valve continuously supplies air; and when the equalizing air cylinder is fully completed, pressure reduction is started, and when the set pressure reduction rate value is reached, the relay valve is cut off to supplement air.
Compared with the prior art, the invention has the beneficial effects that: the invention can select the air supplementing or non-air supplementing mode of the air backup brake according to the backup actual mode, and can control the closing or opening of the front blocking valve of the relay valve according to the pressure change of the balance air cylinder controlled by the backup brake valve when the air supplementing mode is not used, thereby realizing the non-air supplementing function in the air backup brake mode and improving the reliability and the usability of the existing air backup brake system.
Drawings
Fig. 1 is a diagram of a control system according to an embodiment of the present invention.
Detailed Description
The invention provides a system and a method for controlling non-air supplement in an air backup brake mode, which comprises a backup brake mode conversion device with three working conditions, a backup pressure regulating device, a backup brake valve, a brake state pressure valve and a control air circuit, a backup front blocking switching valve and a control air circuit, an air supplement input switching valve and a control air circuit, a backup balancing air cylinder, an air control switching valve 1 for controlling the opening and closing of the total air of a relay valve, a relay valve for controlling the pressure of a train pipe of a locomotive vehicle, an air control switching valve 2 for controlling the closing and opening of an output port of the relay valve and the like.
The backup braking mode conversion device has three states of a normal position, an air position air supplementing mode and an air position non-air supplementing mode. The port A1 is connected with a main air pipe, the port A2 is connected with a control port of an air supply input switching valve 105, the port A3 is connected with an input port of a backup pressure regulating device 102 and a port C1 of an air control switching valve 2110, a port A1 of a backup braking mode switching device is cut off in a normal position, a main air source is cut off, a port A2 and a port A3 of the backup braking mode switching device are communicated with a port A4, and a channel for communicating the control ports of the air supply input switching valve control port and a relay valve output switching valve is communicated with the atmosphere through the port A4, so that the output of a backup relay valve is cut off, and train pipes cannot be controlled. Under the air level non-air-supplementing mode, the switching device communicates with the passage of the control port of the main air and air supplementing input switching valve and the passage of the control port of the relay valve output switching valve, so that the air supplementing input switching valve communicates with the passage of the second control port of the backup block switching valve controlled by the pressure valve in the braking state, the pneumatic control switching valve 1 is controlled by the backup block switching valve to close or open the passage of the main air and the air inlet of the relay valve, the non-air-supplementing function of backup braking is realized, the output of the relay valve is communicated with a train pipe, the backup balance air cylinder of the backup brake valve is charged and discharged, and finally the pressure of the train pipe is controlled. In the air level air supplement mode, the switching device communicates the total air with a passage of a relay valve output switching valve control port, the pressure of the air supplement input into the switching valve control port is exhausted, the passage of the air exhaust of the switching valve is blocked before the control port of the pneumatic control switching valve 1 is reserved, and the air supplement function of the relay valve during backup braking is realized.
The backup brake valve has three states of a relieving position, a neutral position and a braking position, when the relieving position is formed, the back-up brake valve is used for communicating the total air subjected to pressure regulation with a passage of the equalizing air cylinder, the equalizing air cylinder is controlled to rise to a constant pressure, and the relay valve outputs the pressure of the train pipe according to the pressure change of the equalizing air cylinder; when the air cylinder is in a neutral position, all air paths are cut off, and the balance air cylinder and the total air are maintained; when the brake position is in the braking position, the balance air cylinder pressure and the air exhaust passage are communicated, and the service braking function is realized.
The pressure valve in the braking state is always in a release position in the air charging process of the equalizing air cylinder, and the second control port of the backup front interceptor switching valve can be emptied by the air supplementing input switching valve, so that the pressure of the control port of the backup front interceptor switching valve emptying pneumatic control switching valve 1 is enabled; in the process of air exhaust of the balanced air cylinder, the pressure difference between a1 st control port and a2 nd control port of the state pressure valve enables the valve to act to a brake position, namely, an outlet of the communication pressure regulating device is fed into a control port of a backup front blocking switching valve through air supplement, the backup front blocking switching valve acts to communicate the total air with a passage of the control port of the pneumatic control switching valve, and the pneumatic control switching valve closes a passage of the total air and an inlet of a relay valve at the moment, so that the function of air supplement is not realized; when the equalizing air cylinder is braked and pressure is maintained, the valve is kept at the braking position because the pressure at two sides is balanced after pressure reduction is finished, and the passage between the total air and the inlet of the relay valve is continuously cut off.
When the pressure of the 2 nd control port of the switching valve is blocked before backup and led into the outlet of the pressure regulating device, no matter how much the pressure of the 1 st control port is, the valve is used for always communicating the total air with the passage of the control port of the pneumatic control switching valve 1 and closing the passage of the total air and the relay valve; when the pressure of the 2 nd control port is exhausted, as long as the 1 st control port has pressure, the valve is used for communicating the control port of the pneumatic control switching valve 1 with the passage of the atmosphere, the pneumatic control switching valve 1 can automatically open the valve port according to the change of the inlet pressure of the pneumatic control switching valve 1, and the main air is communicated with the passage of the inlet of the relay valve to supply air to the relay valve.
Under the condition that the backup braking mode conversion device is not used for supplying air, the air path switching is always performed during the air exhaust process of the air cylinder and during pressure maintaining after the air exhaust, the communication total air enters a passage of an air inlet of the pneumatic control switching valve 1 through the backup front blocking switching valve, the air inlet and an air outlet of the pneumatic control switching valve 1 are closed, and the function of supplying no air is realized.
The pressure valve in the braking state comprises actions of a control port 1 and a control port 2, wherein the control port 2 is connected with a shrinkage cavity and a buffer air cylinder, in the air charging process, the pressure of the control port 1 is higher than that of the control port 2, pressure difference is formed at the two ends to push the pressure valve to move to a release position, and when the pressures at the two ends are balanced, the valve is continuously kept at the release position; in the braking process, because the balance air cylinder exhausts air, the pressure of the No. 2 control port is larger than that of the No. 1 control port due to the effect of shrinkage cavities in the air exhausting process, pressure difference is formed at two ends to push the pressure valve to move to a braking position, and when pressure is maintained after the balance air cylinder brakes, the pressure at two ends of the valve is balanced, and the valve continues to maintain the braking position.
The conversion method comprises the steps that pure air paths are adopted for conversion, and the influence on backup brake operation after the circuits are realized is avoided.
When the air backup brake conversion device is in a normal position, the pressure of the control port of the air exhaust pneumatic control switching valve 2 is used for closing the connection between the backup relay valve and the train pipe, so that the influence on the normal operation of the locomotive caused by the air charging and air exhausting of the train pipe through the backup relay valve under the normal condition is avoided.
Considering that air backup braking is emergency treatment operation under the special working condition of the locomotive, the system is switched by pure gas circuit control, and the design prevents the failure of a locomotive control circuit and the incapability of operating the air backup braking system.
The invention has two modes of air supplement and air non-supplement in the backup braking mode, and a user can select the air supplement mode or the air non-supplement mode according to a locomotive traction passenger car or a truck vehicle. When the air backup brake conversion device is in a normal position, the connection between the backup relay valve and the train pipe is closed through air passage switching, the influence on the normal operation of the locomotive caused by the fact that the train pipe is inflated and exhausted through the backup relay valve under a normal condition is avoided, and the relay valve and the train pipe are communicated through the air passage switching under a backup brake mode, so that the pressure of the train pipe can be normally controlled through the relay valve under the backup brake mode.
The structure of the brake system of the embodiment of the invention is shown in figure 1.
Backup brake mode switching means 101; a backup pressure regulating device 102; a backup brake valve 103; a brake state pressure valve 104; a pre-backup shutoff switching valve 106 (fourth switching valve); a supplementary air input switching valve 105 (third switching valve); a backup equalization reservoir 107; a pneumatic control switching valve 1108 (first switching valve); backup relay valve 109; a pneumatic control switching valve 2110 (second switching valve); a buffer reservoir 111; a flow restriction device T1.
The backup braking mode conversion device has three states of a normal position, an air position air supplementing mode and an air position non-air supplementing mode. And in the normal position, a main air source is cut off, and a channel for communicating the air supplement input switching valve control port 105 and the relay valve output switching valve control port to exhaust air is formed. Under the air level non-air-supplementing mode, the conversion device communicates the total air and the air-supplementing input passage of the control port of the switching valve and the passage of the control port of the relay valve output pneumatic control switching valve. In the air level air supplement mode, the conversion device communicates the total air with a channel of the relay valve output switching valve control port, and the pressure of the air supplement input into the switching valve control port is exhausted.
The backup pressure regulating valve 102 is a pressure regulating valve, and controls the constant pressure of the equalizing reservoir when air backup brake control is performed.
The backup brake valve has three states of a relieving position, a neutral position and a braking position, when the relieving position is formed, the back-up brake valve is used for communicating the total air subjected to pressure regulation with a passage of the equalizing air cylinder, the equalizing air cylinder is controlled to rise to a constant pressure, and the relay valve outputs the pressure of the train pipe according to the pressure change of the equalizing air cylinder; when the air cylinder is in a neutral position, all air paths are cut off, and the balance air cylinder and the total air are maintained; when the brake is in the braking position, the balance air cylinder pressure is communicated with the air exhaust passage of the atmosphere.
In the process of air charging of the equalizing air cylinder, the pressure valve in the braking state can always act at a release position, and the second control port of the backup front interceptor switching valve can be emptied by the air supplementing input switching valve, so that the pressure of the first control port of the backup front interceptor switching valve is emptied by the air control switching valve 1; in the process of air exhaust of the balanced air cylinder, the pressure difference between a control port 1 and a control port 2 of the pressure valve in a braking state enables the pressure valve to act to a braking position, namely, an outlet of the communication pressure regulating device is put into a control port of a backup front blocking switching valve through air supplement, the backup front blocking switching valve acts to communicate the total air with a passage of the control port of the pneumatic control switching valve, and the pneumatic control switching valve closes a passage of the total air and an inlet of a relay valve at the moment, so that the function of air supplement is not realized; when the equalizing air cylinder is braked and pressure is maintained, the pressure valve is kept at the braking position in the braking state because the pressures at the two sides are balanced after pressure reduction is finished, and the passage between the total air and the inlet of the relay valve is continuously cut off.
The check switch valve before backup has two control ports, when the 2 nd control port of the check switch valve is introduced with the pressure at the outlet of the pressure regulating device, no matter what the pressure of the 1 st control port is, the valve will always communicate the total air with the passage of the control port of the pneumatic control switch valve 1, and close the passage of the total air and the relay valve; when the 2 nd control port is exhausted, the valve will communicate the control port of the air control switch valve 1 with the passage of the atmosphere as long as the 1 st control port has pressure.
The pneumatic control switching valve 1 is provided with an air inlet, an air outlet and a control port, when the control port is airless, only the pressure of the air inlet is greater than a certain pressure, and the pneumatic control switching valve can automatically communicate the pressure of the air inlet and the pressure of the air outlet; when the control port has total wind, the air control switching valve 1 cuts off the passage between the air inlet and the air outlet.
The pneumatic control switch valve 2 is provided with an air inlet, an air outlet and a control port, when the control port is windless, the pneumatic control switch valve 1 cuts off the passage between the air inlet and the air outlet, and when the control port has total wind pressure, the pneumatic control switch valve communicates the pressure of the air inlet and the pressure of the air outlet.
The air supplement input switching valve has two working states, when the control port has no air, the A1 and A2 passages are cut off, the A2 and A3 air outlet passages are communicated, when the control port has air pressure, the A3 air outlet passages are cut off, and the A1 and A2 passages are communicated.
When the locomotive electro-pneumatic brake system is in fault or other conditions need to start the backup brake system, the selection of air backup brake air supplementing and non-air supplementing modes can be realized by switching the backup conversion device, and the function of controlling the train pipe by air backup brake is realized.
In the normal position, the backup brake mode switching device cuts off the main wind from the 105 and 110 valve control ports, the 105 valve is in the closed position, the A1 is disconnected from the A2 port, and the 110 valve cuts off the access to the A1 and A2 ports, so that the rail pressure cannot be controlled no matter which position the backup brake valve is in.
When the air level is in the air supplementing mode, firstly, the air backup conversion device 101 communicates the total air with the passages of 105 and 111 valve control ports, the 105 valve A1 port is communicated with the A2 port, the 110 valve A1 port is communicated with the A2 port, the 102 valve outputs the regulated equalizing reservoir constant pressure, the backup brake valve 103 is operated to a relieving position, the equalizing reservoir 107 is charged with air, the equalizing pressure rises, the 104 valve communicates the pressures of the A2 port and the A3 port according to the rising of the equalizing reservoir, the 106 valve C2 port pressure is exhausted, the 106 valve is enabled to exhaust the 108 valve control port pressure, the 108 valve is in the air supplementing state, and the relay valve can be continuously supplemented with air; when the equalizing reservoir is charged with air and is decompressed, the 104 valve firstly communicates the A2 port with the A3 port according to the decompression rate, the 102 valve outlet is communicated with the A1 port and the A2 port through the 105 valve A1 port and the A2 port to the 106 valve C2 port, the 106 valve further communicates the A1 port with the A2 port, the total air is communicated to the 108 valve C1 port, the 108 valve cuts off the A1 port and the A2 port, and the relay valve is cut off for air supplement, so that the air backup brake operation has the function of no air supplement at the moment. The pressure maintaining position after braking (namely the maintaining state of the equalizing air cylinder after braking) is used for continuously maintaining the state during braking, and the pressure maintaining position after the operation position (the relieving position, namely the state after the equalizing air cylinder is inflated or is inflated to the constant pressure) is used for continuously maintaining the state during the operation position.
When the equalizing air cylinder starts to reduce pressure after air charging is finished, when a pressure reduction rate set value in a braking state is reached, the relay valve is cut off for air supplement, the set value is realized by limiting the flow of a port C1 (realized by using a flow limiting device T1, and T1 can be a pressure regulating valve and other devices) and adjusting the volume of the equalizing air cylinder 111, when the pressure reduction rate of a first control port (a port C1) of the pressure valve exceeds a set common braking pressure reduction rate, the port C1 and a port C2 (a second control port) generate pressure difference, the pressure of the port C2 is greater than the pressure of a port C1, 104 acts to communicate with ports A1 and A2, and total air is cut off through 105, 106 and 108 to realize the function of cutting off for air supplement.
In the air level air supplement mode, the air backup conversion device 101 exhausts 105 valve control port pressure, the ports A1 and A2 are disconnected, the 104 valve cannot control the 106 valve through the 105 valve, then the 106 valve cannot communicate the ports A1 and A2, the 108 valve is controlled, and the 108 valve exhausts the control port pressure through the 106 valve, so that the ports A1 and A2 can be communicated as long as the inlet of the 108 valve has pressure, and the air supplement function is realized. The state during braking is consistent with the operation position state.
The invention can integrate and integrate the valves 104, 105, 106 and the like according to actual conditions, and finally realize the air backup braking non-air-supplementing control.
Claims (7)
1. An air backup brake system comprises a brake mode conversion device, wherein a first output port of the brake mode conversion device is communicated with a first control port of a first switching valve through a first switching passage; the second output port of the braking mode switching device is respectively communicated with the second switching valve control port and the relay valve control port through a second switching passage and a third switching passage which are connected in parallel; the input port and the output port of the first switching valve are respectively communicated with a main wind source of the relay valve and the input port of the relay valve; the relay valve output port is communicated with the second switching valve input port; the output port of the second switching valve is communicated with a train pipe; the device is characterized by also comprising a fourth switching path; the fourth switching passage includes a pressure valve; the pressure valve input port is communicated with the third switching channel input end; the pressure valve output port is communicated with the first switching passage; the first control port and the second control port of the pressure valve are communicated with the third switching passage; and the second control port of the pressure valve is communicated with the buffer air cylinder.
2. The air backup brake system according to claim 1, wherein said first switching passage includes a third switching valve; the third switching valve control port is communicated with the first output port of the braking mode conversion device; the input port of the third switching valve is communicated with the output port of the pressure valve; the output port of the third switching valve is communicated with the first control port of the fourth switching valve; the second control port of the fourth switching valve is communicated with the equalizing reservoir; and the input port of the fourth switching valve is communicated with a main air pipe, and the output port of the fourth switching valve is communicated with the first control port of the first switching valve.
3. The air backup brake system according to claim 1, wherein said third switching path includes a backup brake valve; the input port of the backup brake valve is communicated with the second output port of the brake mode conversion device through a pressure regulating device; the output port of the backup brake valve is connected with the control port of the relay valve and the balance air cylinder; the input port of the pressure valve is connected between the pressure regulating device and the second output port of the braking mode conversion device through a gas circuit; and the first control port and the second control port of the pressure valve are connected between the output port of the backup brake valve and the control port of the relay valve through gas paths.
4. An air backup brake system according to claim 3 wherein said pressure valve second control port is connected between said backup brake valve output port and said relay valve control port by a flow restricting device.
5. A rail transit vehicle employing an air backup brake system according to any one of claims 1 to 4.
6. A method of implementing air backup braking using the air backup braking system of any of claims 1-4, comprising:
when the braking mode conversion device works at a normal position, the first switching channel and the fourth switching channel are cut off, and the second switching channel and the third switching channel are connected;
when the braking mode conversion device works in an air position non-air-supply mode, the first switching channel, the second switching channel, the third switching channel and the fourth switching channel are all communicated, the equalizing air cylinder is filled with air, the equalizing pressure is increased, and the relay valve continuously supplies air; when the balance air cylinder is fully completed, pressure reduction is started, and when the set value of the pressure reduction rate is reached, the relay valve is cut off to supplement air;
when the braking mode conversion device works in an air level air supplementing mode, the first switching passage is cut off, and the pressure of the first control port of the first switching valve is exhausted through the fourth switching valve, so that air supplementing is realized.
7. A method for achieving non-air-supplementing in an air backup braking mode by using the air backup braking system as claimed in any one of claims 1 to 4, the method comprising: when the braking mode conversion device works in an air position non-air-supply mode, the first switching channel, the second switching channel, the third switching channel and the fourth switching channel are all communicated, the equalizing air cylinder is filled with air, the equalizing pressure is increased, and the relay valve continuously supplies air; and when the air charging of the balance air cylinder is finished, pressure reduction is started, and when the set pressure reduction rate value in the braking state is reached, the relay valve is cut off to supplement air.
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| CN202111185036.8A CN113844490B (en) | 2021-10-12 | 2021-10-12 | Air backup braking system, braking method and rail transit vehicle |
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| CN201792855U (en) * | 2010-09-03 | 2011-04-13 | 南车株洲电力机车有限公司 | Rail traffic train pipe control system |
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