CN116714625A - Train pipe constant pressure conversion system and control method - Google Patents

Abstract

The application relates to a locomotive train pipe constant pressure conversion system and a control method, wherein the system comprises the following components: the system comprises a first balanced pressure regulating valve, a second balanced pressure regulating valve, a switching valve and an electric interlocking switching plug door, wherein the first end of the electric interlocking switching plug door is communicated with a main air pipe, and the second end of the electric interlocking switching plug door is communicated with a pre-control port of the switching valve; the electric interlocking switch is connected with the electric interlocking switching plug door; the gas circuit cutting-off unit is connected between the switching valve and the equalizing reservoir; and the exhaust unit is communicated with the equalizing reservoir. The system realizes the conversion of the constant pressure of the train pipe between the set value of the first balance pressure regulating valve and the set value of the second balance pressure regulating valve by controlling the electric interlocking switching plug door, and when the second balance pressure regulating valve is switched into the first balance pressure regulating valve, the air charging passage and the air discharging passage of the balance air cylinder are controlled by utilizing the electric interlocking feedback signal of the electric interlocking switching plug door, so that the pressure of the balance air cylinder is reduced in a period of time.

Description

Train pipe constant pressure conversion system and control method

Technical Field

The application belongs to the technical field of train pipe pressure control, and particularly relates to a train pipe constant pressure conversion system and a control method.

Background

The freight train in China always uses two train pipes of 500kPa and 600kPa for constant pressure. The locomotive controls the pressure of the train pipe in an indirect mode, a balancing air cylinder with fixed volume and a relay valve are inserted between the automatic braking valve and the train pipe, the automatic braking valve controls the balancing air cylinder with small volume, and the balancing air cylinder with small volume controls the air charging and discharging actions of the large-volume train pipe through the relay valve to control the pressure of the train pipe.

When the constant pressure is changed from 600kPa to 500kPa, drivers and passengers firstly need to adjust the pressure regulating valve of the equalizing reservoir to the required pressure, and the cab brake controller is operated to implement excessive pressure reduction so as to ensure that the locomotive and the vehicle can be relieved when being charged again. When the constant pressure is converted into the constant pressure of 500kPa from 600kPa, if the pressure reduction of the locomotive balancing reservoir is insufficient, the locomotive working reservoir and the auxiliary reservoir pressure of the vehicle still approach or even exceed 500kPa, so that an effective pressure difference cannot be formed between a train pipe and the locomotive working reservoir or between the locomotive working reservoir and the auxiliary reservoir of the vehicle when the constant pressure is converted into 500kPa and then the air is charged, the locomotive and the vehicle cannot be relieved, and finally band-type brake faults are caused, the risk of train wheel scratch is brought, and the driving safety is affected.

Disclosure of Invention

Aiming at the defects existing in the related art, the application provides a locomotive train pipe pressure control system and a control method, so as to improve the accuracy of train pipe pressure control.

The application provides a locomotive train pipe pressure control system, comprising:

a total air duct;

the input port of the relay valve is connected with the main air pipe;

a train pipe connected to an output port of the relay valve;

a balancing reservoir connected to a control port of the relay valve;

further comprises:

the input port of the first balance pressure regulating valve is connected with the main air pipe;

the input port of the second balance pressure regulating valve is connected with the main air pipe, and the set value of the second balance pressure regulating valve is larger than that of the first balance pressure regulating valve;

the first air inlet of the switching valve is communicated with the output port of the first balance pressure regulating valve, and the second air inlet of the switching valve is communicated with the output port of the second balance pressure regulating valve;

the first end of the electric interlocking switching plug door is communicated with the main air pipe, and the second end of the electric interlocking switching plug door is communicated with a pre-control port of the switching valve;

the electric interlocking switch is connected with the electric interlocking switching plug door;

the gas circuit cutting unit is connected between the switching valve and the equalizing reservoir; the gas path cutoff unit has: the gas circuit cutting unit enables the switching valve to be communicated with the balancing air cylinder in a first working state; in the second working state, the gas circuit cutting unit cuts off the switching valve and the balancing air cylinder for a period of time and then communicates the switching valve and the balancing air cylinder;

and an exhaust unit which is communicated with the equalizing reservoir and provided with: the third working state is that the exhaust unit cuts off the communication between the equalizing reservoir and the outside; in a fourth working state, the air exhaust unit enables the equalizing reservoir to be communicated with the outside for a period of time and then disconnected;

when the air outlet of the electric interlocking switching plug door is communicated with the air outlet, the pre-control opening of the switching valve does not have preset air pressure, the second air inlet of the switching valve is communicated with the air outlet, the electric interlocking switch is disconnected, the air passage cutting unit is in a first working state, and the air exhaust unit is in a third working state;

when the air inlet and the air outlet of the electric interlocking conversion plug door are communicated, the pre-control port of the switching valve has preset air pressure, the first air inlet and the air outlet of the switching valve are communicated, the electric interlocking switch is closed, the air passage cutting unit enters the second working state, and the air exhaust unit enters the fourth working state.

According to the locomotive train pipe constant pressure conversion system, the constant pressure conversion of a locomotive is simplified into one-step operation, and the train pipe constant pressure can be converted between the set value of the first balanced pressure regulating valve and the set value of the second balanced pressure regulating valve by controlling the communication between the air inlet and the air outlet of the electric interlocking conversion plug door or the communication between the air outlet and the air outlet of the electric interlocking conversion plug door. When the second balance pressure regulating valve is switched to the first balance pressure regulating valve, the air circuit cutting-off unit is controlled to cut off in a certain time by utilizing an electric lock feedback signal of the electric lock conversion plug door, so that an air charging passage of the balance air cylinder is cut off in a certain time, and meanwhile, the air discharging unit is briefly communicated with the outside, namely, the air discharging passage of the balance air cylinder is communicated for a certain time, so that the pressure of the balance air cylinder is forced to be reduced to a certain extent, the pressure reduction of a train pipe is ensured to be large enough, and an effective pressure difference can be formed between the train pipe and a locomotive working air cylinder or a locomotive auxiliary air cylinder during recharging, and the locomotive and a locomotive can be normally relieved; after a period of time, the air charging passage of the equalizing reservoir is restored, and the air discharging passage of the equalizing reservoir is cut off at the same time, so that the equalizing reservoir can be ensured to perform normal charging and discharging control according to an external instruction.

In some of these embodiments, the gas path cutoff unit includes:

the air inlet of the shutoff valve is communicated with the air outlet of the switching valve, and the air outlet of the shutoff valve is communicated with the equalizing reservoir;

the blocking electromagnetic valve is electrically connected with the electric interlocking switch, an air inlet of the blocking electromagnetic valve is communicated with the main air pipe, and an air outlet of the blocking electromagnetic valve is communicated with a pre-control port of the blocking valve;

when the blocking electromagnetic valve is powered off, the air inlet of the blocking electromagnetic valve is disconnected with the air outlet of the blocking electromagnetic valve, the pre-control port of the blocking valve does not have preset air pressure, and the air inlet of the blocking valve is communicated with the air outlet;

when the blocking electromagnetic valve is powered on, an air inlet of the blocking electromagnetic valve is communicated with an air outlet of the blocking electromagnetic valve, a preset air pressure exists at a pre-control port of the blocking valve, and the air inlet of the blocking valve is disconnected from the air outlet for a period of time and then is communicated with the air outlet;

in the first working state, the interruption electromagnetic valve is powered off; in the second working state, the interruption electromagnetic valve is powered off after being powered on for a period of time.

In some of these embodiments, the exhaust unit comprises:

the air inlet of the air exhaust electromagnetic valve is communicated with the equalizing reservoir; when the exhaust electromagnetic valve is powered on, an air inlet of the exhaust electromagnetic valve is communicated with an air outlet, and the equalizing reservoir exhausts to the outside; when the exhaust electromagnetic valve is powered off, the air inlet and the air outlet of the exhaust electromagnetic valve are disconnected, and the equalizing reservoir maintains pressure;

in a third working state, the exhaust electromagnetic valve is powered off; in the fourth working state, the exhaust electromagnetic valve is kept powered for a period of time and then is powered off.

In some of these embodiments, the train pipe constant pressure conversion system further comprises:

the first power-off delay relay is connected with the interruption electromagnetic valve and the electric interlocking switch in series;

the second outage delay relay is connected with the exhaust electromagnetic valve and the electric interlocking switch in series;

when the electric interlocking switch is closed, the first power-off delay relay is electrified, the shutoff electromagnetic valve enters a second working state, meanwhile, the second power-off delay relay is electrified, and the exhaust electromagnetic valve enters a fourth working state.

In some embodiments, the first power-off delay relay is powered on, and a normally open contact of the first power-off delay relay is closed, so that the blocking electromagnetic valve is powered on, and after the delay is finished, the normally open contact of the first power-off delay relay is opened, so that the blocking electromagnetic valve is powered off;

the second power-off delay relay is powered on, and a normally open contact of the second power-off delay relay is closed, so that the exhaust electromagnetic valve is powered on, and after the delay is finished, the normally open contact of the second power-off delay relay is disconnected, so that the exhaust electromagnetic valve is powered off.

In some of these embodiments, the train pipe constant pressure conversion system further comprises:

the release electromagnetic valve is arranged between the switching valve and the balancing air cylinder, and the air outlet of the release electromagnetic valve is communicated with the balancing air cylinder; when the relieving electromagnetic valve is powered on, an air inlet of the relieving electromagnetic valve is communicated with an air outlet, and the balancing air cylinder is inflated; when the relieving electromagnetic valve is powered off, the air inlet and the air outlet of the relieving electromagnetic valve are disconnected, and the equalizing reservoir maintains pressure;

the air inlet of the braking electromagnetic valve is communicated with the equalizing reservoir, and the air outlet of the braking electromagnetic valve is communicated with the air outlet; when the brake electromagnetic valve is powered on, the air inlet of the brake electromagnetic valve is communicated with the air outlet, and the balancing air cylinder is used for exhausting air; when the brake electromagnetic valve is powered off, the air inlet and the air outlet of the brake electromagnetic valve are disconnected, and the balancing air cylinder is used for maintaining pressure.

In some of these embodiments, the train pipe constant pressure conversion system further comprises:

the brake control unit is used for controlling the brake electromagnetic valve and the release electromagnetic valve according to a brake or release instruction of the train; under the braking instruction, the braking control unit controls the braking electromagnetic valve to be electrified and controls the relieving electromagnetic valve to lose electricity, and the balancing air cylinder exhausts air through the braking electromagnetic valve; and under the release instruction, the brake control unit controls the brake electromagnetic valve to lose electricity and controls the release electromagnetic valve to be electrified, and the balancing air cylinder is charged with air through the release electromagnetic valve.

Besides, the application also provides a train pipe constant pressure conversion control method, which comprises the following steps of:

receiving a second constant voltage conversion instruction;

connecting a second balance pressure regulating valve with the balance air cylinder so that the balance air cylinder obtains the pressure of a second set value;

the train pipe obtains a second constant pressure through the amplification effect of the relay valve;

receiving a first constant voltage conversion instruction;

controlling the equalizing reservoir to decompress to zero;

switching on a first balance pressure regulating valve and the balance air cylinder so that the balance air cylinder obtains the pressure of a first set value;

the train pipe obtains a first constant pressure through the amplification effect of the relay valve;

wherein the first set value is smaller than the second set value.

In some embodiments, the train pipe constant pressure conversion control method comprises the following steps:

the electric locking conversion plug door cuts off the pressure of the main air pipe from being transmitted to a pre-control port of the switching valve, and the pressure is regarded as the second constant pressure conversion instruction;

the second air inlet and the air outlet of the switching valve are communicated, and the second balance pressure regulating valve and the switching valve are further connected;

the normally open contact of the electric interlocking switch is opened;

the air passage cutting-off unit is communicated with the second balance pressure regulating valve and the balance air cylinder, and the air exhaust unit cuts off the balance air cylinder from the outside, so that the second balance pressure regulating valve, the switching valve and the shutoff valve are connected, and the balance air cylinder obtains the pressure of a second set value;

the train pipe obtains the second constant pressure through the amplification effect of the relay valve;

the electric interlocking conversion plug valve conveys the pressure of the total air pipe to a pre-control port of the switching valve, and the pressure is regarded as the first constant pressure conversion instruction;

the first air inlet and the air outlet of the switching valve are communicated, and then the first balance pressure regulating valve and the switching valve are communicated;

the electric interlocking switch receives a feedback signal of the electric interlocking switching plug door, and a normally open contact of the electric interlocking switching plug door is closed;

the air circuit cutting unit cuts off the communication between the first balance pressure regulating valve and the balance air cylinder, and the air exhaust unit communicates the balance air cylinder with the outside, so that the balance air cylinder is depressurized to zero;

the air circuit cutting-off unit is communicated with the second balance pressure regulating valve and the balance air cylinder, the air exhaust unit cuts off the balance air cylinder and the outside, and then the first balance pressure regulating valve and the balance air cylinder are connected, so that the balance air cylinder obtains the pressure of a first set value;

and through the amplification effect of the relay valve, the train pipe obtains the first constant pressure.

In some embodiments, the gas circuit cutting unit and the electric interlocking switch are connected in series with a first power-off delay relay;

the exhaust unit and the electric interlocking switch are connected in series with a second outage delay relay;

when the electric lock switch is closed, the first power-off delay relay is powered on, the air circuit cutting-off unit cuts off the communication between the first balance pressure regulating valve and the balance air cylinder, meanwhile, the second power-off delay relay is powered on, and the air exhaust unit is communicated with the balance air cylinder and the outside, so that the balance air cylinder is depressurized to zero;

after the delay is finished, the air circuit cutting-off unit is communicated with the first balance pressure regulating valve and the balance air cylinder, and the air exhaust unit is used for cutting off the balance air cylinder and the outside, so that the first balance pressure regulating valve, the blocking valve and the balance air cylinder are connected, and the balance air cylinder obtains the pressure of the first set value.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:

FIG. 1 is a schematic diagram of a circuit principle of an embodiment of a train pipe constant pressure conversion system according to the present application, wherein an air outlet of an electric interlocking conversion plug door is communicated with an air outlet;

fig. 2 is a schematic circuit diagram of an electrically-locked switch, a first power-off delay relay and a second power-off delay relay of the train pipe constant voltage conversion system in fig. 1;

FIG. 3 is an enlarged view of a portion A of FIG. 1;

FIG. 4 is an enlarged view of a portion B of FIG. 1;

FIG. 5 is a schematic diagram of the piping principle of one embodiment of the inventive train pipe constant voltage switching system in which the air inlet and air outlet of the electrically interlocked switching plug door are in communication and the normally open contacts of the power-off delay relay are closed;

fig. 6 is a schematic circuit diagram of the electric lock switch, the first power-off delay relay and the second power-off delay relay of the train pipe constant voltage conversion system in fig. 5;

FIG. 7 is a schematic diagram of the piping principle of one embodiment of the inventive train pipe constant voltage switching system in which the air inlet and air outlet of the electrically interlocked switching plug are connected and the normally open contacts of the power-off delay relay are disconnected;

in the figure:

1. a relay valve; 2. a train pipe; 3. equalizing the reservoir; 4. a first equalization pressure regulating valve; 5. a second equalization pressure regulating valve; 6. a switching valve; 7. electrically locking the conversion plug door; 8. a shutoff solenoid valve; 9. a shutoff valve; 10. an exhaust electromagnetic valve; 11. an electric lock switch; 12. a relief solenoid valve; 13. a brake solenoid valve; 14. a dispensing valve; 15. a working air cylinder; k11, a first power-off delay relay; k12, a second outage delay relay.

Detailed Description

The technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

It is apparent that the drawings in the following description are only some examples or embodiments of the present application, and it is possible for those of ordinary skill in the art to apply the present application to other similar situations according to these drawings without inventive effort. Moreover, it should be appreciated that while such a development effort might be complex and lengthy, it would nevertheless be a routine undertaking of design, fabrication, or manufacture for those of ordinary skill having the benefit of this disclosure, and thus should not be construed as having the benefit of this disclosure.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is to be expressly and implicitly understood by those of ordinary skill in the art that the described embodiments of the application can be combined with other embodiments without conflict.

It is to be understood that, although the figures may show a particular order of method steps, the order of the steps may differ from what is depicted. Furthermore, two or more steps may be performed simultaneously or partially simultaneously. Such variations will depend on the software and hardware selected and the designer's choice. All such variations are within the scope of the present disclosure.

The terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", or a third "may explicitly or implicitly include one or more such feature.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

The train pipe constant pressure refers to a target pressure when the train pipe is full in the air brake system before braking, and the train pipe pressure is controlled by the equalizing reservoir pressure.

As shown in fig. 1 to 4, in an exemplary embodiment of the train pipe constant pressure conversion system of the present application, the train pipe constant pressure conversion system includes:

a total air duct;

the input port of the relay valve 1 is connected with the main air pipe;

a train pipe 2 connected to an output port of the relay valve 1;

a balancing reservoir 3 connected to the control port of the relay valve 1;

further comprises:

the first balance pressure regulating valve 4, the input port of the first balance pressure regulating valve is connected with the total air pipe;

the input port of the second balance pressure regulating valve is connected with the main air pipe, and the set value of the second balance pressure regulating valve 5 is larger than the set value of the first balance pressure regulating valve 4;

a switching valve 6, the first air inlet 61 of which is communicated with the output port of the first balance pressure regulating valve 4, and the second air inlet 62 of which is communicated with the output port of the second balance pressure regulating valve 5;

the first end of the electric interlocking switching plug door 7 is communicated with the main air pipe, and the second end of the electric interlocking switching plug door 7 is communicated with a pre-control port 63 of the switching valve;

an electric lock switch 11 connected with the electric lock changeover cock 7;

the gas path cutting unit is connected between the switching valve 6 and the equalizing reservoir 3; the gas circuit cutting unit has a first working state: the gas circuit cutting unit enables the switching valve 6 to be communicated with the equalizing reservoir 3; and a second working state: the gas circuit cutting-off unit cuts off the switching valve 6 and the equalizing reservoir 3 for a period of time and then communicates the switching valve and the equalizing reservoir;

and an exhaust unit which is communicated with the equalizing reservoir 3 and comprises: in the third working state, the exhaust unit disconnects the equalizing reservoir 3 from the outside; in a fourth working state, the air exhaust unit enables the equalizing reservoir 3 to be communicated with the outside for a period of time and then disconnected;

referring to fig. 1 to 4, when the air outlet 72 of the electric interlocking switching plug door is communicated with the air outlet 73, the pre-control port 63 of the switching valve does not have preset air pressure, the second air inlet 62 of the switching valve is communicated with the air outlet 64 of the switching valve, the electric interlocking switch 11 is turned off to enable the air passage cutting unit to be in the first working state, and the air exhaust unit is in the third working state;

referring to fig. 5, 6 and 7, when the air inlet 71 and the air outlet 72 of the electric interlocking switching plug door are communicated, the pre-control port 63 of the switching valve has preset air pressure, so that the first air inlet 61 of the switching valve is communicated with the air outlet 64 of the switching valve, and simultaneously, the electric interlocking switching plug door 7 outputs a feedback signal to the electric interlocking switch 11, so that the electric interlocking switch 11 is closed, the air passage cut-off unit is brought into the second working state, and the air exhaust unit is brought into the fourth working state.

In the above-described exemplary embodiment, the train pipe constant pressure conversion system simplifies the constant pressure conversion of the locomotive into one operation, and the train pipe constant pressure conversion between the set value of the first balance pressure regulating valve 4 and the set value of the second balance pressure regulating valve 5 can be achieved by controlling the communication between the air inlet 71 and the air outlet 72 of the electric interlocking conversion plug door or the communication between the air outlet 72 and the air outlet 73 of the electric interlocking conversion plug door. In addition, referring to fig. 5 and 6, when the second balancing pressure regulating valve 5 is switched to the first balancing pressure regulating valve 4, the electric lock feedback signal of the electric lock switching plug door 7 is used for controlling the electric lock switch 11, so that the air path cutting unit cuts off in a certain time, the air charging path of the balancing air cylinder 3 is cut off in a certain time, and meanwhile, the air discharging unit communicated with the balancing air cylinder 3 is briefly communicated with the outside, so that the air discharging path of the balancing air cylinder 3 is communicated for a certain time, the pressure of the balancing air cylinder 3 is forced to drop to a certain extent, the pressure reduction amount of a train pipe is ensured to be large enough, the train pipe and the locomotive working air cylinder or the locomotive auxiliary air cylinder can form an effective pressure difference during recharging, and the locomotive can be normally relieved; referring to fig. 7, after a period of time, the air charging passage of the equalizing reservoir 3 is restored, and the air discharging passage of the equalizing reservoir 3 is cut off at the same time, so as to ensure that the equalizing reservoir 3 can perform normal air charging and discharging control according to an external command.

In the train pipe constant pressure conversion system provided in the present embodiment, the first balance pressure regulating valve 4 and the second balance pressure regulating valve 5 correspond to two kinds of constant pressures of the train pipe, respectively. For example, for a railway freight train, two trains of 500kPa and 600kPa are respectively responsible for constant pressure. In the present embodiment, the first and second balance pressure regulating valves are pressure regulating valves, the setting value of the first balance pressure regulating valve 4 is 500kPa, and the setting value of the second balance pressure regulating valve 5 is 600kPa. The electric interlocking switching plug door 7 is a two-position three-way electrified interlocking feedback component, and the electric interlocking switching plug door 7 is provided with two positions of constant pressure 600kPa and constant pressure 500 kPa. When the constant pressure is 600kPa, the electric locking conversion plug door cuts off a total air supply passage, and simultaneously the pressure of the pre-control port 63 of the switching valve is discharged to the atmosphere through the air outlet 72 and the air outlet 73 of the electric locking conversion plug door; when the constant pressure is 500kPa, the air inlet 71 of the electric interlocking switching plug door is communicated with the air outlet 72, and total wind is transmitted to the pre-control port 63 of the switching valve through the electric interlocking switching plug door 7, and meanwhile, a high-level feedback signal is output. The switching valve 6 controls the constant pressure switching according to whether the pilot port 63 is pressure-controlled.

The switching valve 6 is a two-position three-way valve, when the electric interlocking switching plug door is in the position of 'constant pressure 600 kPa', the pre-control port 63 of the switching valve is pressureless, the second air inlet 62 is communicated with the air outlet 64 under the action of the spring pressure at the bottom of the switching valve 6, and when the electric interlocking switching plug door is in the position of 'constant pressure 500 kPa', the switching valve 6 overcomes the spring pressure at the bottom of the switching valve 6 under the action of the total wind pressure of the pre-control port 63, so that the first air inlet 61 is communicated with the air outlet 64.

Referring to fig. 1, 5 and 7, in another exemplary embodiment, the gas path cut-off unit includes:

the blocking valve 9, the air inlet of the blocking valve 9 is communicated with the air outlet of the switching valve 6, and the air outlet of the blocking valve 9 is communicated with the equalizing reservoir 3;

the shutoff solenoid valve 8, the shutoff solenoid valve 8 is electrically connected with the electric interlocking switch 11, the air inlet of the shutoff solenoid valve 8 is communicated with the main air pipe, and the air outlet of the shutoff solenoid valve 8 is communicated with the pre-control port of the shutoff valve 9;

when the shutoff solenoid valve 8 is powered off, the air inlet of the shutoff solenoid valve 8 is disconnected with the air outlet of the shutoff solenoid valve 8, the pre-control port of the shutoff valve 9 does not have preset air pressure, and the air inlet of the shutoff valve 9 is communicated with the air outlet;

when the shutoff solenoid valve 8 is powered on, an air inlet of the shutoff solenoid valve 8 is communicated with an air outlet of the shutoff solenoid valve 8, a preset air pressure exists at a pre-control port of the shutoff valve 9, and the air inlet of the shutoff valve 9 is disconnected from the air outlet for a period of time and then is communicated with the air outlet;

in the first working state, the shutoff electromagnetic valve 8 is powered off; in the second working state, the interruption solenoid valve 8 is powered off after a period of time. The shutoff solenoid valve 8 is a two-position three-way solenoid valve. The shutoff valve is a two-position two-way valve and is used for controlling the switching valve to close and open the gas path of the equalizing reservoir according to whether the pre-control port is provided with pressure or not. The air circuit cutting unit can also independently adopt a high-flow electromagnetic valve mode, and is used for cutting off the air charging passage of the equalizing air cylinder within a certain time when the electric interlocking conversion plug door is converted from constant pressure 600kPa to constant pressure 500 kPa.

Referring to fig. 1, 5 and 7, in another exemplary embodiment, the air discharge unit includes:

the air exhaust electromagnetic valve 10, the air inlet of the air exhaust electromagnetic valve 10 is communicated with the equalizing reservoir 3; when the air exhaust electromagnetic valve is powered on, the air inlet of the air exhaust electromagnetic valve 10 is communicated with the air outlet, and the equalizing reservoir 3 exhausts air to the outside; when the air exhaust electromagnetic valve 10 is powered off, the air inlet and the air outlet of the air exhaust electromagnetic valve 10 are disconnected, and the pressure is maintained by the balancing air cylinder 3;

in the third working state, the exhaust electromagnetic valve 10 is powered off; in the fourth operating state, the exhaust solenoid valve 10 remains energized for a period of time and then loses power. The exhaust electromagnetic valve is a two-position two-way electromagnetic valve. The exhaust unit can also adopt a mode of controlling a pilot electromagnetic valve and an air release valve combination, and the mode is used for ensuring that the pressure of a balanced air cylinder is reduced to a certain degree in a certain time when the electric interlocking conversion plug door is converted from constant pressure 600kPa to constant pressure 500kPa, and ensuring that the pressure of a train pipe which is charged with air again and the pressure of a secondary air cylinder of an individual vehicle form normal relief pressure difference (generally at least 20 kPa) when the constant pressure of 500kPa is ensured. For example, the exhaust unit may control the equalization reservoir exhaust pressure to zero.

Referring to fig. 1, 4, 5, 6 and 7, in another exemplary embodiment, the train pipe constant pressure conversion system further comprises:

the first power-off delay relay K11 is connected with the shutoff solenoid valve 8 and the electric interlocking switch 11 in series;

the second outage delay relay K12 is connected with the exhaust electromagnetic valve 10 and the electric interlocking switch 11 in series;

when the electric interlocking switch 11 is closed, the first power-off delay relay K11 is powered on, the shutoff electromagnetic valve 8 enters a second working state, meanwhile, the second power-off delay relay K12 is powered on, and the exhaust electromagnetic valve 10 enters a fourth working state.

The first power-off delay relay K11 is powered on, a normally open contact of the first power-off delay relay K11 is closed, so that the interruption electromagnetic valve 8 is powered on, and after the delay is finished, the normally open contact of the first power-off delay relay K11 is disconnected, so that the interruption electromagnetic valve 8 is powered off;

the second outage delay relay K12 is powered on, a normally open contact of the second outage delay relay K12 is closed, the exhaust electromagnetic valve 10 is powered on, and after the delay is finished, the normally open contact of the second outage delay relay K12 is opened, so that the exhaust electromagnetic valve 10 is powered off. When the power is lost, normally open contacts of the power-off delay relays K11 and K12 are kept in an open state. The magnitude of the pressure reduction amount can be controlled by adjusting the first power-off delay relay and the delay time length of the first power-off delay relay.

In another exemplary embodiment, the train pipe constant pressure conversion system further comprises:

the relief electromagnetic valve 12 is arranged between the switching valve 6 and the equalizing reservoir 3, and the air outlet of the relief electromagnetic valve 12 is communicated with the equalizing reservoir; when the relieving electromagnetic valve 12 is powered on, the air inlet and the air outlet of the relieving electromagnetic valve 12 are communicated, and the equalizing reservoir 3 is inflated; when the electromagnetic valve 12 is released from losing electricity, the air inlet and the air outlet of the electromagnetic valve 12 are disconnected, and the air cylinder 3 is balanced for pressure maintaining;

the air inlet of the brake electromagnetic valve 13 is communicated with the equalizing reservoir 3, and the air outlet of the brake electromagnetic valve 13 is communicated with the air outlet; when the brake electromagnetic valve 13 is powered on, the air inlet of the brake electromagnetic valve 13 is communicated with the air outlet, and the air cylinder 3 is balanced for exhausting air; when the brake electromagnetic valve 13 is powered off, the air inlet and the air outlet of the brake electromagnetic valve 13 are disconnected, and the pressure maintaining of the air cylinder 3 is balanced.

In another exemplary embodiment, the train pipe constant pressure conversion system further comprises:

a brake control unit for controlling the brake solenoid valve 13 and the brake solenoid valve 12 according to a brake or brake release instruction of the train; under a braking instruction, the braking control unit controls the braking electromagnetic valve 13 to be powered on, and controls the relief electromagnetic valve 12 to lose electricity, and the equalizing reservoir 3 exhausts air through the braking electromagnetic valve 13; under the release instruction, the brake control unit controls the brake solenoid valve 13 to lose electricity and controls the release solenoid valve 12 to be powered on, and the equalizing reservoir 3 is charged with air through the release solenoid valve 12.

Another exemplary embodiment of the present application discloses a method for controlling constant pressure conversion of a train pipe, which is based on the foregoing constant pressure conversion system of the train pipe, comprising:

receiving a second constant voltage conversion instruction;

connecting a second balance pressure regulating valve with the balance air cylinder so that the balance air cylinder obtains the pressure of a second set value;

the train pipe obtains a second constant pressure through the amplification effect of the relay valve;

receiving a first constant voltage conversion instruction;

controlling the equalizing reservoir to decompress;

switching on a first balance pressure regulating valve and the balance air cylinder so that the balance air cylinder obtains the pressure of a first set value;

the train pipe obtains a first constant pressure through the amplification effect of the relay valve;

wherein the first set value is smaller than the second set value.

Wherein, the first constant pressure conversion instruction is converted by the electric interlocking conversion plug door into that when the air inlet 71 and the air outlet 72 of the electric interlocking conversion plug door are communicated, the pre-control port 63 of the switching valve has a preset air pressure. The second constant pressure conversion instruction is converted by the electric interlocking conversion stopper into that when the air outlet 72 of the electric interlocking conversion stopper is communicated with the air outlet 73, the pre-control port 63 of the switching valve does not have the preset air pressure. It should be noted that the second constant pressure conversion command and the first constant pressure conversion command are not limited in sequence, and specifically, the first constant pressure conversion command or the second constant pressure conversion command is determined according to the constant pressure before the constant pressure conversion of the train pipe. For example, the constant pressure of the train pipe is 500kPa, and at this time, the constant pressure is converted to 600kPa, and the conversion from the low pressure to the high pressure is performed according to the received second constant pressure conversion command.

In another exemplary embodiment, the train pipe constant pressure conversion control method includes:

the electric locking conversion plug door cuts off the pressure of the main air pipe from being transmitted to a pre-control port of the switching valve, and the pressure is regarded as the second constant pressure conversion instruction;

the second air inlet and the air outlet of the switching valve are communicated, and the second balance pressure regulating valve and the switching valve are further connected;

the normally open contact of the electric interlocking switch is not closed;

the air passage cutting-off unit is communicated with the second balance pressure regulating valve and the balance air cylinder, and the air exhaust unit cuts off the balance air cylinder from the outside, so that the second balance pressure regulating valve, the switching valve and the shutoff valve are connected, and the balance air cylinder obtains the pressure of a second set value;

the train pipe obtains the second constant pressure through the amplification effect of the relay valve;

the electric interlocking conversion plug valve conveys the pressure of the total air pipe to a pre-control port of the switching valve, and the pressure is regarded as the first constant pressure conversion instruction;

the first air inlet and the air outlet of the switching valve are communicated, and then the first balance pressure regulating valve and the switching valve are communicated;

the electric interlocking switch receives a feedback signal of the electric interlocking switching plug door, and a normally open contact of the electric interlocking switching plug door is closed;

the air circuit cutting unit cuts off the communication between the first balance pressure regulating valve and the balance air cylinder, and the air exhaust unit is communicated with the balance air cylinder and the outside, so that the balance air cylinder is depressurized;

the air circuit cutting-off unit is communicated with the second balance pressure regulating valve and the balance air cylinder, the air exhaust unit cuts off the balance air cylinder and the outside, and then the first balance pressure regulating valve and the balance air cylinder are connected, so that the balance air cylinder obtains the pressure of a first set value;

and through the amplification effect of the relay valve, the train pipe obtains the first constant pressure.

In another exemplary embodiment, the train pipe constant pressure conversion control method includes:

the gas circuit cutting-off unit and the electric interlocking switch are connected in series with a first power-off delay relay;

the exhaust unit and the electric interlocking switch are connected in series with a second outage delay relay;

when the electric lock switch is closed, the first power-off delay relay is powered on, the air circuit cutting-off unit cuts off the communication between the first balance pressure regulating valve and the balance air cylinder, meanwhile, the second power-off delay relay is powered on, and the air exhaust unit is communicated with the balance air cylinder and the outside, so that the balance air cylinder is depressurized;

after the delay is finished, the air circuit cutting-off unit is communicated with the first balance pressure regulating valve and the balance air cylinder, and the air exhaust unit is used for cutting off the balance air cylinder and the outside, so that the first balance pressure regulating valve, the blocking valve and the balance air cylinder are connected, and the balance air cylinder obtains the pressure of the first set value.

Finally, it should be noted that: in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.

The above embodiments are only for illustrating the technical solution of the present application and not for limiting the same; while the application has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present application or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the application, it is intended to cover the scope of the application as claimed.

Claims (10)

1. A train pipe constant pressure conversion system, comprising:

a total air duct; the input port of the relay valve is connected with the main air pipe; a train pipe connected to an output port of the relay valve; a balancing reservoir connected to a control port of the relay valve;

further comprises:

the input port of the first balance pressure regulating valve is connected with the main air pipe;

the input port of the second balance pressure regulating valve is connected with the main air pipe, and the set value of the second balance pressure regulating valve is larger than that of the first balance pressure regulating valve;

the first air inlet of the switching valve is communicated with the output port of the first balance pressure regulating valve, and the second air inlet of the switching valve is communicated with the output port of the second balance pressure regulating valve;

the first end of the electric interlocking switching plug door is communicated with the main air pipe, and the second end of the electric interlocking switching plug door is communicated with a pre-control port of the switching valve;

the electric interlocking switch is connected with the electric interlocking switching plug door;

the gas circuit cutting unit is connected between the switching valve and the equalizing reservoir; the gas path cutoff unit has: the gas circuit cutting unit enables the switching valve to be communicated with the balancing air cylinder in a first working state; in the second working state, the gas circuit cutting unit cuts off the switching valve and the balancing air cylinder for a period of time and then communicates the switching valve and the balancing air cylinder;

and an exhaust unit which is communicated with the equalizing reservoir and provided with: the third working state is that the exhaust unit cuts off the communication between the equalizing reservoir and the outside; in a fourth working state, the air exhaust unit enables the equalizing reservoir to be communicated with the outside for a period of time and then disconnected;

when the air outlet of the electric interlocking switching plug door is communicated with the air outlet, the pre-control opening of the switching valve does not have preset air pressure, the second air inlet of the switching valve is communicated with the air outlet, the electric interlocking switch is disconnected, the air passage cutting unit is in a first working state, and the air exhaust unit is in a third working state;

when the air inlet and the air outlet of the electric interlocking conversion plug door are communicated, the pre-control port of the switching valve has preset air pressure, the first air inlet and the air outlet of the switching valve are communicated, the electric interlocking switch is closed, the air passage cutting unit enters the second working state, and the air exhaust unit enters the fourth working state.

2. The train pipe constant pressure conversion system according to claim 1, wherein the gas path cut-off unit includes:

the air inlet of the shutoff valve is communicated with the air outlet of the switching valve, and the air outlet of the shutoff valve is communicated with the equalizing reservoir;

the blocking electromagnetic valve is electrically connected with the electric interlocking switch, an air inlet of the blocking electromagnetic valve is communicated with the main air pipe, and an air outlet of the blocking electromagnetic valve is communicated with a pre-control port of the blocking valve;

when the blocking electromagnetic valve is powered off, the air inlet of the blocking electromagnetic valve is disconnected with the air outlet of the blocking electromagnetic valve, the pre-control port of the blocking valve does not have preset air pressure, and the air inlet of the blocking valve is communicated with the air outlet;

when the blocking electromagnetic valve is powered on, an air inlet of the blocking electromagnetic valve is communicated with an air outlet of the blocking electromagnetic valve, a preset air pressure exists at a pre-control port of the blocking valve, and the air inlet of the blocking valve is disconnected from the air outlet for a period of time and then is communicated with the air outlet;

in the first working state, the interruption electromagnetic valve is powered off; in the second working state, the interruption electromagnetic valve is powered off after being powered on for a period of time.

3. The train pipe constant pressure conversion system according to claim 2, wherein the exhaust unit comprises:

the air inlet of the air exhaust electromagnetic valve is communicated with the equalizing reservoir; when the exhaust electromagnetic valve is powered on, an air inlet of the exhaust electromagnetic valve is communicated with an air outlet, and the equalizing reservoir exhausts to the outside; when the exhaust electromagnetic valve is powered off, the air inlet and the air outlet of the exhaust electromagnetic valve are disconnected, and the equalizing reservoir maintains pressure;

in a third working state, the exhaust electromagnetic valve is powered off; in the fourth working state, the exhaust electromagnetic valve is kept powered for a period of time and then is powered off.

4. The train pipe constant pressure conversion system according to claim 3, further comprising:

the first power-off delay relay is connected with the interruption electromagnetic valve and the electric interlocking switch in series;

the second outage delay relay is connected with the exhaust electromagnetic valve and the electric interlocking switch in series;

when the electric interlocking switch is closed, the first power-off delay relay is electrified, the shutoff electromagnetic valve enters a second working state, meanwhile, the second power-off delay relay is electrified, and the exhaust electromagnetic valve enters a fourth working state.

5. The train pipe constant pressure conversion system according to claim 4, wherein,

the first power-off delay relay is powered on, a normally open contact of the first power-off delay relay is closed, so that the interruption electromagnetic valve is powered on, and after the delay is finished, the normally open contact of the first power-off delay relay is disconnected, so that the interruption electromagnetic valve is powered off;

the second power-off delay relay is powered on, and a normally open contact of the second power-off delay relay is closed, so that the exhaust electromagnetic valve is powered on, and after the delay is finished, the normally open contact of the second power-off delay relay is disconnected, so that the exhaust electromagnetic valve is powered off.

6. The train pipe constant pressure conversion system according to claim 1, further comprising:

the release electromagnetic valve is arranged between the switching valve and the balancing air cylinder, and the air outlet of the release electromagnetic valve is communicated with the balancing air cylinder; when the relieving electromagnetic valve is powered on, an air inlet of the relieving electromagnetic valve is communicated with an air outlet, and the balancing air cylinder is inflated; when the relieving electromagnetic valve is powered off, the air inlet and the air outlet of the relieving electromagnetic valve are disconnected, and the equalizing reservoir maintains pressure;

the air inlet of the braking electromagnetic valve is communicated with the equalizing reservoir, and the air outlet of the braking electromagnetic valve is communicated with the air outlet; when the brake electromagnetic valve is powered on, the air inlet of the brake electromagnetic valve is communicated with the air outlet, and the balancing air cylinder is used for exhausting air; when the brake electromagnetic valve is powered off, the air inlet and the air outlet of the brake electromagnetic valve are disconnected, and the balancing air cylinder is used for maintaining pressure.

7. The train pipe constant pressure conversion system according to claim 6, further comprising:

the brake control unit is used for controlling the brake electromagnetic valve and the release electromagnetic valve according to a brake or release instruction of the train; under the braking instruction, the braking control unit controls the braking electromagnetic valve to be electrified and controls the relieving electromagnetic valve to lose electricity, and the balancing air cylinder exhausts air through the braking electromagnetic valve; and under the release instruction, the brake control unit controls the brake electromagnetic valve to lose electricity and controls the release electromagnetic valve to be electrified, and the balancing air cylinder is charged with air through the release electromagnetic valve.

8. A train pipe constant pressure conversion control method based on the train pipe constant pressure conversion system according to any one of claims 1 to 7, comprising:

receiving a second constant voltage conversion instruction;

connecting a second balance pressure regulating valve with the balance air cylinder so that the balance air cylinder obtains the pressure of a second set value;

the train pipe obtains a second constant pressure through the amplification effect of the relay valve;

receiving a first constant voltage conversion instruction;

controlling the equalizing reservoir to decompress;

switching on a first balance pressure regulating valve and the balance air cylinder so that the balance air cylinder obtains the pressure of a first set value;

the train pipe obtains a first constant pressure through the amplification effect of the relay valve;

wherein the first set value is smaller than the second set value.

9. The train pipe constant pressure conversion control method according to claim 8, comprising:

the electric locking conversion plug door cuts off the pressure of the main air pipe from being transmitted to a pre-control port of the switching valve, and the pressure is regarded as the second constant pressure conversion instruction;

the second air inlet and the air outlet of the switching valve are communicated, and the second balance pressure regulating valve and the switching valve are further connected;

the normally open contact of the electric interlocking switch is opened;

the air passage cutting-off unit is communicated with the second balance pressure regulating valve and the balance air cylinder, and the air exhaust unit cuts off the balance air cylinder from the outside, so that the second balance pressure regulating valve, the switching valve and the shutoff valve are connected, and the balance air cylinder obtains the pressure of a second set value;

the train pipe obtains the second constant pressure through the amplification effect of the relay valve;

the electric interlocking conversion plug valve conveys the pressure of the total air pipe to a pre-control port of the switching valve, and the pressure is regarded as the first constant pressure conversion instruction;

the first air inlet and the air outlet of the switching valve are communicated, and then the first balance pressure regulating valve and the switching valve are communicated;

the electric interlocking switch receives a feedback signal of the electric interlocking switching plug door, and a normally open contact of the electric interlocking switching plug door is closed;

the air circuit cutting unit cuts off the communication between the first balance pressure regulating valve and the balance air cylinder, and the air exhaust unit is communicated with the balance air cylinder and the outside, so that the balance air cylinder is depressurized;

the air circuit cutting-off unit is communicated with the second balance pressure regulating valve and the balance air cylinder, the air exhaust unit cuts off the balance air cylinder and the outside, and then the first balance pressure regulating valve and the balance air cylinder are connected, so that the balance air cylinder obtains the pressure of a first set value;

and through the amplification effect of the relay valve, the train pipe obtains the first constant pressure.

10. The train pipe constant pressure conversion control method according to claim 9, wherein:

the gas circuit cutting-off unit and the electric interlocking switch are connected in series with a first power-off delay relay;

the exhaust unit and the electric interlocking switch are connected in series with a second outage delay relay;

when the electric lock switch is closed, the first power-off delay relay is powered on, the air circuit cutting-off unit cuts off the communication between the first balance pressure regulating valve and the balance air cylinder, meanwhile, the second power-off delay relay is powered on, and the air exhaust unit is communicated with the balance air cylinder and the outside, so that the balance air cylinder is depressurized;

after the delay is finished, the air circuit cutting-off unit is communicated with the first balance pressure regulating valve and the balance air cylinder, and the air exhaust unit is used for cutting off the balance air cylinder and the outside, so that the first balance pressure regulating valve, the blocking valve and the balance air cylinder are connected, and the balance air cylinder obtains the pressure of the first set value.