CN108839649B - Air brake unit air-electricity interlocking control system and control method - Google Patents
Air brake unit air-electricity interlocking control system and control method Download PDFInfo
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- CN108839649B CN108839649B CN201810711339.0A CN201810711339A CN108839649B CN 108839649 B CN108839649 B CN 108839649B CN 201810711339 A CN201810711339 A CN 201810711339A CN 108839649 B CN108839649 B CN 108839649B
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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
- 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
- B60T13/58—Combined or convertible systems
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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
- 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
- B60T13/74—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 electrical assistance or drive
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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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- 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
- B61H11/14—Combinations of different types of brakes, e.g. brake blocks acting on wheel-rim combined with disc brakes
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- Engineering & Computer Science (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 brake unit air-electricity interlocking control system and a control method, wherein the air brake unit air-electricity interlocking control system comprises a three-way electromagnetic valve, a switching valve and a two-way electromagnetic valve, wherein a first port of the three-way electromagnetic valve is connected with a pre-control port of the switching valve, a second port of the three-way electromagnetic valve is communicated with the atmosphere, and a third port of the three-way electromagnetic valve is connected with a main air cylinder; the air inlet of the switching valve is connected with a brake cylinder pipe, and the air outlet of the switching valve is connected with a brake cylinder; a first port of the two-way electromagnetic valve is connected with the pre-control port, and a second port of the two-way electromagnetic valve is communicated with the atmosphere; the gas path drift diameter between the first port of the two-way electromagnetic valve and the pre-control port of the switching valve is larger than that between the first port of the three-way electromagnetic valve and the pre-control port of the switching valve; the brake control unit is used for controlling the three-way electromagnetic valve and the two-way electromagnetic valve to be powered on or powered off. The air brake unit air-electric interlocking device is simple in structure, improves the reliability and stability of the air brake unit air-electric interlocking function, and is high in safety parking probability under the condition that the electromagnetic valve fails.
Description
Technical Field
The invention belongs to the technical field of locomotive brake control, and particularly relates to an air brake unit air-electricity interlocking control system and a control method.
Background
The stability of the performance of a brake system, which is one of the most important systems of a locomotive, is directly related to whether the locomotive can be operated safely. The air brake and the electric brake cannot be applied simultaneously, and when the air brake is applied, the electric brake is automatically cut off; the air brake is automatically removed when the electric brake is applied.
As shown in fig. 1, the conventional air brake unit air-electric interlock control system includes a three-way electromagnetic valve and a mechanical switching valve, wherein a first port of the three-way electromagnetic valve is connected to a pre-control port of the switching valve, a second port of the three-way electromagnetic valve is communicated with the atmosphere, a third port of the three-way electromagnetic valve is connected to a master reservoir, and a control end of the three-way electromagnetic valve is electrically connected to a brake control unit; the air inlet of the switching valve is connected with a brake cylinder pipe, the air outlet of the switching valve is connected with a brake cylinder, and the air outlet of the switching valve is communicated with the atmosphere; the brake cylinder pipe is connected with the distribution valve.
The operation of the electro-pneumatic interlock control system of the air brake unit shown in fig. 1 is as follows:
when the brake control unit cuts off the air-electricity interlocking signal of the air brake unit, the brake control unit controls the three-way electromagnetic valve to lose electricity, the first port and the third port of the three-way electromagnetic valve are turned off, the first port and the second port of the three-way electromagnetic valve are communicated, the pre-control port of the switching valve is communicated with the atmosphere sequentially through the first port of the three-way electromagnetic valve and the second port of the three-way electromagnetic valve, and the air of the pre-control port of the switching valve is exhausted to the atmosphere. When the pressure of the pilot port of the switching valve is reduced to be lower than a conduction threshold value, the air inlet of the switching valve is communicated with the air outlet, the distribution valve controls compressed air in the brake cylinder pipe to enter the brake cylinder through the switching valve, and the air brake unit applies air brake. At this time, the locomotive is in a braking state.
When the brake control unit sends an air-electricity interlocking signal to the air brake unit, the brake control unit controls the three-way electromagnetic valve to be electrified, the first port and the third port of the three-way electromagnetic valve are communicated, the first port and the second port of the three-way electromagnetic valve are disconnected, the main air cylinder is communicated with the pre-control port of the switching valve sequentially through the third port of the three-way electromagnetic valve and the first port of the three-way electromagnetic valve, compressed air in the main air cylinder enters the pre-control port of the switching valve, and the pressure of the pre-control port of the switching valve rises. When the pressure of the pilot control port of the switching valve rises to exceed the conduction threshold value, the air inlet and the air outlet of the switching valve are blocked, and compressed air in the brake cylinder pipe cannot enter the brake cylinder through the switching valve. Meanwhile, the brake cylinder, the air outlet of the switching valve and the exhaust port of the switching valve are sequentially communicated with the atmosphere, compressed air in the brake cylinder is exhausted to the atmosphere through the switching valve, and the air brake unit is in a brake relieving state. The locomotive is in a relaxed or electric braking state.
One of the most important functions of the brake system of the locomotive with the electro-pneumatic interlocking function is the stability of the performance of the brake system and the safety of the whole brake system.
The three-way solenoid valve has a limited service life due to the long-term effects of water vapor, oil and small particles in the air. Because the realization of the air-electricity interlocking function of the existing air brake unit is mainly realized by the three-way electromagnetic valve and the switching valve, when the three-way electromagnetic valve breaks down, the phenomenon that the brake cylinder cannot be normally inflated or exhausted occurs, so that the problem that the brake cylinder is not braked or is not relieved after being braked occurs, and certain hidden trouble is brought to the safe operation of a locomotive. Therefore, the reliability and the stability of the existing air brake unit air-electric interlocking control system are low, and the safe stop of the locomotive cannot be ensured under the condition that the three-way electromagnetic valve fails.
Disclosure of Invention
The existing air brake unit air-electricity interlocking control system is low in reliability and stability, and the safe stop of a locomotive cannot be guaranteed under the condition that a three-way electromagnetic valve fails. The invention aims to provide an air brake unit electro-pneumatic interlocking control system and a control method aiming at the defects of the prior art, the air brake unit electro-pneumatic interlocking control system is simple in structure, the reliability and the stability of the electro-pneumatic interlocking function of the air brake unit are improved to a certain extent, and the probability of safe shutdown of a locomotive is high under the condition that an electromagnetic valve fails.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
an air-electric interlocking control system of an air brake unit comprises a three-way electromagnetic valve and a switching valve, wherein a first port of the three-way electromagnetic valve is connected with a pre-control port of the switching valve, a second port of the three-way electromagnetic valve is communicated with the atmosphere, a third port of the three-way electromagnetic valve is connected with a main air cylinder, and a control end of the three-way electromagnetic valve is electrically connected with a brake control unit; the air inlet of the switching valve is connected with a brake cylinder pipe, the air outlet of the switching valve is connected with a brake cylinder, and the air outlet of the switching valve is communicated with the atmosphere; the brake cylinder pipe is connected with the distribution valve; wherein the content of the first and second substances,
a brake control unit: the three-way electromagnetic valve is used for controlling the three-way electromagnetic valve to be powered on or powered off according to whether an empty power interlocking signal is sent to the air brake unit or not;
three-way electromagnetic valve: when the power is on, the first port is communicated with the third port, and the first port is disconnected with the second port; when power is lost, the first port and the third port are switched off, and the first port and the second port are switched on;
switching valves: when the pressure of the pre-control port is larger than a conduction threshold value, the air inlet and the air outlet are cut off; when the pressure of the pre-control port is smaller than the conduction threshold value, the air inlet is communicated with the air outlet;
the brake control device is characterized by also comprising a two-way electromagnetic valve, wherein a first port of the two-way electromagnetic valve is connected with a pre-control port of the switching valve, a second port of the two-way electromagnetic valve is communicated with the atmosphere, and a control end of the two-way electromagnetic valve is electrically connected with the brake control unit; the gas path drift diameter between the first port of the two-way electromagnetic valve and the pre-control port of the switching valve is larger than that between the first port of the three-way electromagnetic valve and the pre-control port of the switching valve;
wherein the content of the first and second substances,
a brake control unit: the air brake unit is also used for controlling the two-way electromagnetic valve to be powered on or powered off according to whether an empty power interlocking signal is sent to the air brake unit;
two-way solenoid valve: when the power is on, the first port and the second port are closed; when the power is lost, the first port is communicated with the second port.
As a preferable mode, the gas path drift diameter between the first port of the two-way electromagnetic valve and the pre-control port of the switching valve is 4.5 mm-5.5 mm, and the gas path drift diameter between the first port of the three-way electromagnetic valve and the pre-control port of the switching valve is 0.5 mm-1.5 mm.
Based on the same invention concept, the invention also provides a method for performing the air-electricity interlocking control by using the air brake unit air-electricity interlocking control system, which comprises the following steps:
when the brake control unit cuts off the air-electricity interlocking signal of the air brake unit, the brake control unit controls the three-way electromagnetic valve to lose electricity, and air at the pre-control port of the switching valve is discharged to the atmosphere through the first port of the three-way electromagnetic valve and the second port of the three-way electromagnetic valve in sequence;
when the pressure of the pilot control port of the switching valve is reduced below a conduction threshold value, an air inlet and an air outlet of the switching valve are conducted, compressed air in a brake cylinder pipe is controlled by a distributing valve to enter a brake cylinder through the switching valve, and an air brake unit applies air brake;
when the brake control unit cuts off the air-electricity interlocking signal of the air brake unit, the brake control unit also controls the two-way electromagnetic valve to lose electricity, and the air at the pre-control port of the switching valve is discharged to the atmosphere through the first port of the two-way electromagnetic valve and the second port of the two-way electromagnetic valve in sequence.
Further, when the brake control unit sends an air-electricity interlocking signal to the air brake unit, the brake control unit controls the three-way electromagnetic valve and the two-way electromagnetic valve to be electrified, compressed air in the main air reservoir sequentially enters the switching valve pre-control port through the third port of the three-way electromagnetic valve and the first port of the three-way electromagnetic valve, and the pressure of the switching valve pre-control port continuously rises; when the pressure of the pilot control port of the switching valve rises to exceed the conduction threshold value, the air inlet and the air outlet of the switching valve are cut off, meanwhile, the brake cylinder, the air outlet of the switching valve and the exhaust port of the switching valve are sequentially communicated with the atmosphere, compressed air in the brake cylinder is exhausted to the atmosphere through the switching valve, and the air brake unit is in a brake release state.
Compared with the prior art, the invention has the following beneficial effects:
1. under the condition that the three-way electromagnetic valve and the two-way electromagnetic valve have no fault clamping stagnation, the air brake unit can normally realize the air-electricity interlocking function.
2. If only the two-way electromagnetic valve fails and is blocked, the air brake unit brakes:
when the brake control unit cuts off the air-electricity interlocking signal of the air brake unit, compressed air of the pre-control port of the switching valve cannot be discharged to the atmosphere through the two-way electromagnetic valve, and the compressed air of the pre-control port of the switching valve can be discharged to the atmosphere through the three-way electromagnetic valve, so that the air brake unit can brake normally.
When the brake control unit sends an air-electricity interlocking signal to the air brake unit, compressed air at the pre-control port of the switching valve is exhausted to the atmosphere through the two-way electromagnetic valve, meanwhile, the main air cylinder inflates the pre-control port of the switching valve through the three-way electromagnetic valve, because the air path drift diameter between the first port of the two-way electromagnetic valve and the pre-control port of the switching valve is larger than that between the first port of the three-way electromagnetic valve and the pre-control port of the switching valve, the exhaust rate of the pre-control port is larger than the inflation rate, the pre-control port of the switching valve cannot build pressure, the air inlet and the air outlet of the switching valve are communicated, compressed air in the.
3. If only three-way solenoid valve breaks down and is stuck, the air braking unit brakes:
when the brake control unit cuts off the air-electricity interlocking signal of the air brake unit, the main air cylinder inflates air to the switching valve pre-control port through the three-way electromagnetic valve, compressed air at the switching valve pre-control port is exhausted to the atmosphere through the two-way electromagnetic valve, and the air path drift diameter between the first port of the two-way electromagnetic valve and the switching valve pre-control port is larger than that between the first port of the three-way electromagnetic valve and the switching valve pre-control port, so that even if the three-way electromagnetic valve inflates the switching valve, the pressure of the switching valve pre-control port can be rapidly reduced through the exhaust action of the two-way electromagnetic valve, and the air brake.
When the brake control unit sends an air-electricity interlocking signal to the air brake unit, the pressure of the pre-control port of the switching valve is exhausted to the atmosphere through the three-way electromagnetic valve, the air inlet and the air outlet of the switching valve are communicated, the distribution valve controls compressed air in the brake cylinder pipe to enter the brake cylinder through the switching valve, and the air brake unit applies air brake.
4. If the three-way electromagnetic valve and the two-way electromagnetic valve simultaneously have faults and are blocked:
when the brake control unit cuts off the air-electricity interlocking signal of the air brake unit, the main air cylinder inflates to the switching valve pre-control opening through the three-way electromagnetic valve, compressed air at the switching valve pre-control opening cannot be exhausted to the atmosphere through the two-way electromagnetic valve, so that the air inlet and the air outlet of the switching valve are cut off, a brake cylinder pipe cannot inflate to a brake cylinder through the switching valve, and the air brake unit cannot brake.
When the brake control unit sends an air-electricity interlocking signal to the air brake unit, the pressure of the pilot control port of the switching valve is exhausted to the atmosphere through the three-way electromagnetic valve and the two-way electromagnetic valve, the pressure of the pilot control port of the switching valve is rapidly reduced, the air inlet and the air outlet of the switching valve are communicated, the distribution valve controls compressed air in the brake cylinder to enter the brake cylinder through the switching valve, and the air brake unit applies air brake.
Therefore, the reliability and the stability of the air brake unit air-electric interlocking function are improved to a certain extent, the air brake unit cannot brake only when the three-way electromagnetic valve and the two-way electromagnetic valve are in failure and stuck, and the probability of safe parking of the locomotive is high.
Drawings
Fig. 1 is a schematic structural diagram of an air-electric interlocking control system of an air brake unit in the prior art.
FIG. 2 is a schematic structural diagram of an electro-pneumatic interlock control system of the air brake unit of the present invention.
The system comprises a brake cylinder, a three-way electromagnetic valve, a switching valve, a master air cylinder, a brake control unit, a brake cylinder pipe, a brake cylinder, a distribution valve and a two-way electromagnetic valve, wherein the 1 is the three-way electromagnetic valve, the 2 is the switching valve, the 3 is the master air cylinder, the 4 is the brake control unit, the 5 is the brake cylinder pipe, the 6 is the.
Detailed Description
As shown in fig. 2, the air-to-electric interlocking control system of the air brake unit of the invention comprises a three-way electromagnetic valve and a switching valve 2, wherein a first port of the three-way electromagnetic valve 1 is connected with a pre-control port of the switching valve 2, a second port of the three-way electromagnetic valve 1 is communicated with the atmosphere, a third port of the three-way electromagnetic valve 1 is connected with a main air cylinder 3, and a control end of the three-way electromagnetic valve 1 is electrically connected with a brake control unit 4; an air inlet of the switching valve 2 is connected with a brake cylinder pipe 5, an air outlet of the switching valve 2 is connected with a brake cylinder 6, and an air outlet of the switching valve 2 is communicated with the atmosphere; the brake cylinder pipe 5 is connected with a distribution valve 7; wherein the content of the first and second substances,
the brake control unit 4: the three-way electromagnetic valve 1 is used for controlling power on or power off according to whether an air-electricity interlocking signal is sent to the air brake unit;
three-way electromagnetic valve 1: when the power is on, the first port is communicated with the third port, and the first port is disconnected with the second port; when power is lost, the first port and the third port are switched off, and the first port and the second port are switched on;
a switching valve 2: when the pressure of the pre-control port is larger than a conduction threshold value, the air inlet and the air outlet are cut off; when the pressure of the pre-control port is smaller than the conduction threshold value, the air inlet is communicated with the air outlet;
the air brake unit air-electricity interlocking control system further comprises a two-way electromagnetic valve 8, wherein a first port of the two-way electromagnetic valve 8 is connected with a pre-control port of the switching valve 2, a second port of the two-way electromagnetic valve 8 is communicated with the atmosphere, and a control end of the two-way electromagnetic valve 8 is electrically connected with the brake control unit 4; the gas path drift diameter between the first port of the two-way electromagnetic valve 8 and the pre-control port of the switching valve 2 is larger than that between the first port of the three-way electromagnetic valve 1 and the pre-control port of the switching valve 2;
the brake control unit 4: the two-way electromagnetic valve 8 is also used for controlling power on or power off according to whether an idle electric interlocking signal is sent to the air brake unit;
two-way electromagnetic valve 8: when the power is on, the first port and the second port are closed; when the power is lost, the first port is communicated with the second port.
The gas path drift diameter between the first port of the two-way electromagnetic valve 8 and the pre-control port of the switching valve 2 is 5mm, and the gas path drift diameter between the first port of the three-way electromagnetic valve 1 and the pre-control port of the switching valve 2 is 1 mm.
The method for performing the air-electricity interlocking control by using the air brake unit air-electricity interlocking control system comprises the following steps:
when the brake control unit 4 cuts off an air-electricity interlocking signal of the air brake unit, the brake control unit 4 controls the three-way electromagnetic valve 1 to lose electricity, the first port and the third port of the three-way electromagnetic valve 1 are turned off, the first port and the second port of the three-way electromagnetic valve 1 are communicated, the pre-control port of the switching valve 2 is communicated with the atmosphere sequentially through the first port of the three-way electromagnetic valve 1 and the second port of the three-way electromagnetic valve 1, and the air at the pre-control port of the switching valve 2 is discharged to the atmosphere sequentially through the first port of the three-way electromagnetic valve 1 and the second port of the;
when the pilot port of the selector valve 2 is exhausted to the atmosphere and the pressure of the pilot port of the selector valve 2 is continuously decreased, and when the pilot port pressure of the selector valve 2 is decreased to a conduction threshold or less, the inlet port and the outlet port of the selector valve 2 are conducted, the distribution valve 7 controls the compressed air in the cylinder pipe 5 to enter the brake cylinder 6 through the selector valve 2, and the air brake unit applies air brake. At this time, the locomotive is in a braking state.
When the brake control unit 4 cuts off the no-load interlock signal of the air brake unit, the brake control unit 4 also controls the two-way electromagnetic valve 8 to lose power, the first port and the second port of the two-way electromagnetic valve 8 are communicated, the pre-control port of the switching valve 2 is communicated with the atmosphere sequentially through the first port of the two-way electromagnetic valve 8 and the second port of the two-way electromagnetic valve 8, and the air at the pre-control port of the switching valve 2 is exhausted to the atmosphere sequentially through the first port of the two-way electromagnetic valve 8 and the second port of the two-way electromagnetic valve 8.
When the brake control unit 4 sends an air-electricity interlocking signal to the air brake unit, the brake control unit 4 controls the three-way electromagnetic valve 1 and the two-way electromagnetic valve 8 to be electrified simultaneously, the first port and the second port of the two-way electromagnetic valve 8 are closed, and a path of air exhaust of the pre-control port of the switching valve 2 through the two-way electromagnetic valve 8 is cut off. The first port and the third port of the three-way electromagnetic valve 1 are communicated, the first port and the second port of the three-way electromagnetic valve 1 are closed, the main air cylinder 3 is communicated with the pre-control port of the switching valve 2 sequentially through the third port of the three-way electromagnetic valve 1 and the first port of the three-way electromagnetic valve 1, compressed air in the main air cylinder 3 sequentially enters the pre-control port of the switching valve 2 sequentially through the third port of the three-way electromagnetic valve 1 and the first port of the three-way electromagnetic valve 1, and the pressure of the pre-control port of the switching valve 2 continuously rises; when the pilot port pressure of the switching valve 2 rises above the conduction threshold, the air inlet and the air outlet of the switching valve 2 are blocked, and the compressed air in the brake cylinder pipe 5 cannot enter the brake cylinder 6 through the switching valve 2. Meanwhile, the brake cylinder 6, the air outlet of the switching valve 2 and the air outlet of the switching valve 2 are sequentially communicated with the atmosphere, compressed air in the brake cylinder 6 is exhausted to the atmosphere through the switching valve 2, and the air brake unit is in a brake release state. The locomotive is in a relaxed or electric braking state.
The working logic of the invention is as follows:
1. under the condition that the three-way electromagnetic valve 1 and the two-way electromagnetic valve 8 have no fault and clamping stagnation, the air brake unit normally realizes the air-electricity interlocking function according to the method of the invention.
2. If only the two-way electromagnetic valve 8 fails and is blocked, the air brake unit brakes:
when the brake control unit 4 cuts off the no-power interlock signal of the air brake unit, the two-way solenoid valve 8 and the three-way solenoid valve 1 are simultaneously de-energized, but the two-way solenoid valve 8 is clamped due to failure, so that the three-way solenoid valve 1 is in a normal de-energized state, and the two-way solenoid valve 8 is equivalently in an energized state. At this time, the pilot port compressed air of the switching valve 2 cannot be discharged to the atmosphere through the two-way electromagnetic valve 8, but the pilot port compressed air of the switching valve 2 can be discharged to the atmosphere through the three-way electromagnetic valve 1, and finally the air inlet and the air outlet of the switching valve 2 are communicated, so that the air brake unit can be normally braked.
When the brake control unit 4 sends an air-electricity interlocking signal to the air brake unit, the two-way solenoid valve 8 and the three-way solenoid valve 1 are powered on at the same time, but the two-way solenoid valve 8 is blocked due to faults, so that the three-way solenoid valve 1 is in a normal power-on state, and the two-way solenoid valve 8 is equivalently in a power-off state. At this time, compressed air at the pre-control port of the switching valve 2 is exhausted to the atmosphere through the two-way electromagnetic valve 8, meanwhile, the main air cylinder 3 inflates the pre-control port of the switching valve 2 through the three-way electromagnetic valve 1, the air path drift diameter between the first port of the two-way electromagnetic valve 8 and the pre-control port of the switching valve 2 is larger than that between the first port of the three-way electromagnetic valve 1 and the pre-control port of the switching valve 2, therefore, the exhaust rate of the pre-control port is larger than the inflation rate, the pre-control port of the switching valve 2 cannot build pressure, the air inlet and the air outlet of the switching valve 2 are communicated, the distribution valve 7 controls the compressed air in the.
3. If only three-way solenoid valve 1 breaks down and is stuck, the air braking unit brakes:
when the brake control unit 4 cuts off the no-power interlock signal of the air brake unit, the two-way electromagnetic valve 8 and the three-way electromagnetic valve 1 are simultaneously de-energized, but the three-way electromagnetic valve 1 is clamped due to failure, so that the two-way electromagnetic valve 8 is in a normal de-energized state, and the three-way electromagnetic valve 1 is equivalently in an energized state. At this time, the master cylinder 3 charges the pilot port of the switching valve 2 through the three-way electromagnetic valve 1, compressed air at the pilot port of the switching valve 2 is simultaneously discharged to the atmosphere through the two-way electromagnetic valve 8, and the gas path drift diameter between the first port of the two-way electromagnetic valve 8 and the pilot port of the switching valve 2 is larger than that between the first port of the three-way electromagnetic valve 1 and the pilot port of the switching valve 2, so that even if the three-way electromagnetic valve 1 charges the switching valve 2, the pressure of the pilot port of the switching valve 2 can be rapidly reduced through the exhaust action of the two-way electromagnetic valve 8, and the air inlet and the air outlet of the switching valve 2 are communicated, thereby.
When the brake control unit 4 sends an air-electricity interlocking signal to the air brake unit, the two-way electromagnetic valve 8 and the three-way electromagnetic valve 1 are powered on at the same time, but the three-way electromagnetic valve 1 is blocked due to faults, so that the two-way electromagnetic valve 8 is in a normal power-on state, and the three-way electromagnetic valve 1 is equivalently in a power-off state. At this time, the pressure at the pilot port of the selector valve 2 is released to the atmosphere by the three-way electromagnetic valve 1, and finally the inlet port and the outlet port of the selector valve 2 are communicated with each other, and the distribution valve 7 controls the compressed air in the brake cylinder pipe 5 to enter the brake cylinder 6 through the selector valve 2, so that the air brake unit applies air brake.
4. If the three-way electromagnetic valve 1 and the two-way electromagnetic valve 8 are in failure and are blocked:
when the braking control unit 4 cuts off the air-electricity interlocking signal of the air braking unit, the two-way electromagnetic valve 8 and the three-way electromagnetic valve 1 lose electricity at the same time, but because the three-way electromagnetic valve 1 and the two-way electromagnetic valve 8 are in failure and clamping stagnation, the two-way electromagnetic valve 8 and the three-way electromagnetic valve 1 are equivalently in an electrified state. At this time, the master reservoir 3 is charged to the pilot port of the switching valve 2 through the three-way solenoid valve 1, and at this time, since the pilot port compressed air of the switching valve 2 cannot be discharged to the atmosphere through the two-way solenoid valve 8, the gap between the inlet port and the outlet port of the switching valve 2 is blocked, the brake cylinder pipe 5 cannot be charged to the brake cylinder 6 through the switching valve 2, and the pressure of the brake cylinder 6 is discharged to the atmosphere through the switching valve 2, so that the brake cylinder 6 is cut off, and the air brake unit cannot.
When the brake control unit 4 sends an air-electricity interlocking signal to the air brake unit, the two-way solenoid valve 8 and the three-way solenoid valve 1 are powered on at the same time, but because the three-way solenoid valve 1 and the two-way solenoid valve 8 are both in failure and clamping stagnation, the two-way solenoid valve 8 and the three-way solenoid valve 1 are both equivalently in a power-off state. At this time, the pressure at the pilot port of the selector valve 2 is released to the atmosphere through the three-way solenoid valve 1 and the two-way solenoid valve 8, the pressure at the pilot port of the selector valve 2 is rapidly reduced, the inlet port and the outlet port of the selector valve 2 are communicated, the distribution valve 7 controls the compressed air in the brake cylinder pipe 5 to enter the brake cylinder 6 through the selector valve 2, and the air brake unit applies air brake.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (4)
1. An air-electric interlocking control system of an air brake unit comprises a three-way electromagnetic valve (1) and a switching valve (2), wherein a first port of the three-way electromagnetic valve (1) is connected with a pre-control port of the switching valve (2), a second port of the three-way electromagnetic valve (1) is communicated with the atmosphere, a third port of the three-way electromagnetic valve (1) is connected with a main air cylinder (3), and a control end of the three-way electromagnetic valve (1) is electrically connected with a brake control unit (4); an air inlet of the switching valve (2) is connected with a brake cylinder pipe (5), an air outlet of the switching valve (2) is connected with a brake cylinder (6), and an air outlet of the switching valve (2) is communicated with the atmosphere; the brake cylinder pipe (5) is connected with the distribution valve (7); wherein the content of the first and second substances,
brake control unit (4): the three-way electromagnetic valve (1) is controlled to be powered on or powered off according to whether an air-electricity interlocking signal is sent to the air brake unit or not;
three-way solenoid valve (1): when the power is on, the first port is communicated with the third port, and the first port is disconnected with the second port; when power is lost, the first port and the third port are switched off, and the first port and the second port are switched on;
switching valve (2): when the pressure of the pre-control port is larger than a conduction threshold value, the air inlet and the air outlet are cut off; when the pressure of the pre-control port is smaller than the conduction threshold value, the air inlet is communicated with the air outlet;
the brake system is characterized by further comprising a two-way electromagnetic valve (8), wherein a first port of the two-way electromagnetic valve (8) is connected with a pre-control port of the switching valve (2), a second port of the two-way electromagnetic valve (8) is communicated with the atmosphere, and a control end of the two-way electromagnetic valve (8) is electrically connected with the brake control unit (4); the gas path drift diameter between the first port of the two-way electromagnetic valve (8) and the pre-control port of the switching valve (2) is larger than that between the first port of the three-way electromagnetic valve (1) and the pre-control port of the switching valve (2); wherein the content of the first and second substances,
brake control unit (4): the air brake unit is also used for controlling the two-way electromagnetic valve (8) to be powered on or powered off according to whether an empty power interlocking signal is sent to the air brake unit;
two-way solenoid valve (8): when the power is on, the first port and the second port are closed; when the power is lost, the first port is communicated with the second port.
2. An electro-pneumatic interlock control system for an air brake unit according to claim 1, wherein the gas path between the first port of the two-way solenoid valve (8) and the pre-control port of the switching valve (2) has a path diameter of 4.5mm to 5.5mm, and the gas path between the first port of the three-way solenoid valve (1) and the pre-control port of the switching valve (2) has a path diameter of 0.5mm to 1.5 mm.
3. A method of performing electro-pneumatic interlock control using the electro-pneumatic interlock control system of the air brake unit according to claim 1 or 2, comprising:
when the brake control unit (4) cuts off the air-electricity interlocking signal of the air brake unit, the brake control unit (4) controls the three-way electromagnetic valve (1) to lose electricity, and air at the pre-control port of the switching valve (2) is discharged to the atmosphere through the first port of the three-way electromagnetic valve (1) and the second port of the three-way electromagnetic valve (1) in sequence;
when the pressure of the pilot control port of the switching valve (2) is continuously reduced while the pilot control port of the switching valve (2) exhausts to the atmosphere, when the pressure of the pilot control port of the switching valve (2) is reduced to be below a conduction threshold value, an air inlet and an air outlet of the switching valve (2) are conducted, a distribution valve (7) controls compressed air in a brake cylinder pipe (5) to enter a brake cylinder (6) through the switching valve (2), and an air brake unit applies air brake;
it is characterized in that the preparation method is characterized in that,
when the brake control unit (4) cuts off the no-load interlocking signal of the air brake unit, the brake control unit (4) also controls the two-way electromagnetic valve (8) to lose power, and the air of the pre-control port of the switching valve (2) is discharged to the atmosphere through the first port of the two-way electromagnetic valve (8) and the second port of the two-way electromagnetic valve (8) in sequence.
4. The method of performing an electro-pneumatic interlock control according to claim 3,
when the brake control unit (4) sends an air-electricity interlocking signal to the air brake unit, the brake control unit (4) controls the three-way electromagnetic valve (1) and the two-way electromagnetic valve (8) to be electrified, compressed air in the main air cylinder (3) sequentially passes through a third port of the three-way electromagnetic valve (1) and a first port of the three-way electromagnetic valve (1) to enter a pre-control port of the switching valve (2), and the pressure of the pre-control port of the switching valve (2) continuously rises; when the pressure of the pilot control port of the switching valve (2) rises to exceed the conduction threshold value, the air inlet and the air outlet of the switching valve (2) are blocked, meanwhile, the brake cylinder (6), the air outlet of the switching valve (2) and the exhaust port of the switching valve (2) are communicated with the atmosphere in sequence, compressed air in the brake cylinder (6) is exhausted to the atmosphere through the switching valve (2), and the air brake unit is in a brake release state.
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| CN112706740B (en) * | 2021-02-24 | 2021-12-17 | 中车株洲电力机车有限公司 | Locomotive and brake cylinder pressure control system and method during emergency braking of locomotive |
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Effective date of registration: 20220809 Address after: 266012 south side of Xinye road and west side of Herong Road, Qingdao high tech Industrial Development Zone, Qingdao, Shandong Province Patentee after: CRRC Brake System Co.,Ltd. Address before: 412001 Tianxin garden in Shi Feng District, Zhuzhou, Hunan Patentee before: CRRC ZHUZHOU LOCOMOTIVE Co.,Ltd. |