CN218489639U - Underground trackless equipment shutdown safety brake control device - Google Patents

Abstract

The utility model provides an underground trackless equipment shuts down safety brake controlling means, include: the parking brake system comprises a power supply assembly, a starter, a generator, a key switch, a brake button, a neutral position switch, a first interlocking relay, a second interlocking relay, a starting relay, a first emergency stop button, a second emergency stop button, an engine controller ECU (electronic control Unit), a time relay, a control relay, a pressure relief solenoid valve, a pressure switch and a parking solenoid valve, wherein the starter and the generator are respectively connected in parallel between a positive polarity end and a negative polarity end of the power supply assembly, a first lead is further led out from the positive polarity end of the power supply assembly, the other end of the first lead is connected with a current input end of the key switch, and a first branch, a second branch and a third branch are led out from a first current output end of the key switch.

Description

Underground trackless equipment shutdown safety brake control device

Technical Field

The utility model relates to an underground trackless equipment technical field, in particular to underground trackless equipment shuts down safety brake controlling means.

Background

At present, underground mining operation belongs to high-risk industry, and provides higher requirements for safe work in the face of more and more complex working conditions. The mining trackless equipment is widely applied, is mainly used for operations such as shoveling, loading, transporting, unloading and the like of ores, has more and more attention paid to equipment safety requirements along with the use of the equipment, not only is the performance of the equipment continuously improved, but also the safety control function of the equipment is shown.

After an engine of the existing equipment is stopped, a hydraulic braking system loop still has pressure, so that the existing equipment has the danger of vehicle sliding; especially when the engine of the equipment on the slope is out of order due to faults, the phenomenon of vehicle sliding is easy to occur, so that the trackless equipment is easy to fall down to cause collision danger. After the equipment is shut down, the pressure of the energy accumulator is relieved, and the energy accumulator needs about 30 seconds to be charged after the engine is restarted.

SUMMERY OF THE UTILITY MODEL

The purpose of the present invention is to solve at least one of the technical drawbacks.

Therefore, an object of the present invention is to provide a safety brake control device for stopping an underground trackless device, so as to solve the problems mentioned in the background art and overcome the disadvantages existing in the prior art.

In order to achieve the above object, an embodiment of the utility model provides an underground trackless equipment shuts down safety brake controlling means, include:

a power supply assembly, a starter, a generator, a key switch, a brake button, a neutral position switch, a first interlocking relay, a second interlocking relay, a starting relay, a first emergency stop button, a second emergency stop button, an engine controller ECU, a time relay, a control relay, a pressure relief electromagnetic valve, a pressure switch and a parking electromagnetic valve,

wherein a starter and a generator are respectively connected in parallel between the positive polarity end and the negative polarity end of the power supply assembly, a first lead is further led out from the positive polarity end of the power supply assembly, the other end of the first lead is connected with the current input end of the key switch, a first branch, a second branch and a third branch are led out from the first current output end of the key switch,

wherein the first branch comprises: the positive pole of the power supply assembly is sequentially connected with a main power switch, a fuse, a first circuit breaker, a second circuit breaker, a key switch, a normally open contact of a brake button, a neutral position switch, a first interlocking relay, a starting relay, a starter, a normally closed contact of a first emergency stop button, a normally closed contact of a second emergency stop button, an engine controller ECU, a generator and a power supply negative pole in series to form a power supply loop of the whole circuit;

the second branch includes: the system comprises a power supply assembly, a power supply main switch, a fuse, a first circuit breaker, a second circuit breaker, a third circuit breaker, a key switch, a normally open contact of a brake button, a neutral position switch, a first interlocking relay, a starting relay, a starter, a normally closed contact of a first emergency stop button, a normally closed contact of a second emergency stop button, an engine controller ECU (electronic control unit), a generator, a time relay, a control relay, a pressure relief electromagnetic valve and a power supply cathode, and a safety brake control loop of the underground trackless equipment after being stopped is formed;

the third branch includes: the system comprises a power supply assembly, a power supply main switch, a fuse, a first circuit breaker, a second circuit breaker, a third circuit breaker, a key switch, a normally open contact of a brake button, a neutral position switch, an interlocking relay, a starting relay, a starter, a normally closed contact of a first emergency stop button, a normally closed contact of a second emergency stop button, an engine controller ECU, a generator, a time relay, a control relay, a pressure relief electromagnetic valve, a second interlocking relay, a hydraulic brake circuit pressure switch, a parking brake electromagnetic valve and a power supply negative electrode, and a safety brake control circuit of the underground trackless equipment after the underground trackless equipment is stopped is formed.

In any of the above solutions, preferably, in the first branch, when the key switch S1 is placed in the "3" position, the brake button is in a pressed state and its normally open contact is closed, and the gear position is placed in the neutral position and the neutral switch is closed.

By any of the above schemes, preferably, in the second branch, no matter where the key switch is located, as long as the engine stall occurs, the D + end of the generator does not have a 24V voltage signal output, and the closed contact of the time relay is powered off within a preset time after the relay coil is powered off, so that the pressure relief electromagnetic valve is powered on, the pressure of the energy accumulator is discharged, and the hydraulic brake circuit is not provided with hydraulic oil equipment and is in a brake state.

Preferably, in the third branch, when the engine ECU signal does not output a 24V voltage signal, the relay coil is de-energized and its normally open contact is in an off state, and when oil leaks from the hydraulic brake circuit of the equipment to make the system pressure lower than the brake opening pressure, the hydraulic brake circuit pressure switch is in the off state and the parking brake solenoid valve coil is de-energized.

Preferably, in any of the above schemes, when the engine of the device is normally shut down, the key door returns to the '0' position, when the engine is abnormally shut down, the key door stays at the I-gear position, and the coil of the power-off delay time relay KT1 is connected to the output signal D + end of the generator.

The utility model provides a simple structure, convenient operation effectively prevents the safety brake controlling means that the rear block collided after trackless equipment shut down. The hydraulic braking system has the advantages that the working state of the engine, the time relay, the relay and the pressure switch are judged to control the on-off of the pressure relief solenoid valve of the hydraulic braking loop and the parking braking solenoid valve, when the pressure relief solenoid valve is electrified, hydraulic oil of the hydraulic braking loop is discharged, and when the parking braking solenoid valve is powered off, parking braking is carried out, so that the safety braking function of equipment in the shutdown state is guaranteed.

The utility model has the main advantages that: after the control device is adopted, the underground trackless equipment can be ensured to be automatically and safely braked after being stopped in normal work. When the engine is abnormally shut down, the safety automatic braking function of the equipment is realized through the interlocking control of the control signals of the power-off delay time relay and the generator. The scheme is simple and convenient to operate, and the safety performance of the scheme is more reliable. The safety brake function is mainly embodied in the abnormal shutdown state of the engine, and the condition that the engine or equipment is suddenly flamed due to unsafe factors cannot be predicted by an operator can be automatically and safely braked, so that the dangerous condition is effectively prevented.

The utility model discloses an engine abnormal flameout back through outage time delay relay KT1, control relay K4 control hydraulic circuit pressure release solenoid valve Y1 and parking braking solenoid valve Y2 break-make to make braking system return circuit oil pressure let out and parking braking solenoid valve Y2 outage, equipment is in the safety braking state automatically.

To sum up, the utility model discloses a safety brake controlling means when underground trackless equipment engine shuts down back safety brake and the unusual flameout condition of engine. After the engine is stopped in any state, the coil of the interlocking relay K4 is de-energized, and the normally open contact of the interlocking relay is in a disconnected state to break a power supply loop of the parking solenoid valve Y2, so that the equipment is in a parking braking state; the D + end of the generator has no voltage signal output, the power-off delay time relay KT1 is powered off, the coil of the relay K3 is controlled to be powered off in a delayed mode, the pressure of the energy accumulator is discharged by the pressure relief electromagnetic valve after the engine is flamed out, and the automatic safety braking function of the device is achieved.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic diagram of a first branch of an underground trackless equipment shutdown safety brake control apparatus according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a second branch of the underground trackless equipment shutdown safety brake control apparatus according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a third branch of the underground trackless equipment shutdown safety brake control device according to the embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In order to guarantee the safety of underground trackless transportation equipment, the safety management of the equipment must be enhanced, and the safety consciousness and the skill of practitioners are improved. Once the equipment breaks down, the smooth production is influenced, and the safe and normal operation of the equipment must be ensured, so that a control system for starting an engine in a neutral position and a parking state is designed for underground trackless transportation equipment, and a safety brake control system for stopping the engine in any state is designed at the same time, so that the safety state protection of normal parking brake of the equipment on people can be realized, and the automatic safety brake function of the equipment after the equipment is stopped can be ensured.

Based on this, the utility model provides an underground trackless equipment shuts down safety braking's controlling means.

As shown in fig. 1 to fig. 3, the utility model discloses secret trackless equipment shutdown safety braking controlling means of embodiment includes: the system comprises a power supply assembly, a starter, a generator, a key switch, a brake button, a neutral position switch, a first interlocking relay, a second interlocking relay, a starting relay, a first emergency stop button, a second emergency stop button, an engine controller ECU (electronic control Unit), a time relay, a control relay, a pressure relief electromagnetic valve, a pressure switch and a parking electromagnetic valve. The starter and the generator are respectively connected in parallel between the positive polarity end and the negative polarity end of the power supply assembly. The power supply assembly is connected with a circuit breaker QF1/QF2/QF3, a starter D, a key switch S1, a brake button SB1, an interlocking relay K2, a neutral position switch SQ, a starting relay K1, an emergency stop button SB2/SB3, a generator F, a time relay KT1, a control relay K3, an interlocking relay K4, a pressure switch KP1, and the starter D and the generator F in parallel.

The positive end of the power supply module further leads out a first lead, the other end of the first lead is connected with the current input end of the key switch, and the first current output end of the key switch leads out a first branch circuit, a second branch circuit and a third branch circuit.

As shown in fig. 1, the positive electrode of the first branch is connected in series with a main power switch S, a fuse FU1, a first breaker QF1, a second breaker QF2, a key switch S1, a normally open contact of a brake button SB1, a neutral switch SQ, an interlock relay K2, a start relay K1, a starter D, a normally closed contact of a first emergency stop button SB2, a normally closed contact of a second emergency stop button SB3, an engine controller ECU, a generator F and a negative electrode of a power supply in sequence to form a power supply loop of the whole circuit.

The first branch is formed by sequentially arranging a power supply assembly with a positive electrode connected in series with a storage battery GB, a power supply main switch S, a fuse FU1, a starter positive electrode 30 and a starter negative electrode 31 into a starting closed loop. When the key switch S1 is placed in a gear position of 3, a normally open contact of a brake button SB1 is closed in a pressed state, a neutral switch SQ of the brake button SB1 is closed in the neutral position, a starting interlocking relay K2 is controlled by engine ECU signals J2 (48) and J2 (33), when the engine rotating speed is less than 300rpm, the normally closed contacts of the ECU signals J2 (48) and J2 (33) without 24V voltage signals output relay K2 are in a closed state, a starting relay coil K1 is electrified, the normally open contact is closed, and the starter starting coil is electrified, so that the engine is successfully started.

As shown in figure 2, the second branch circuit is composed of a power supply assembly, a power main switch S, a fuse FU1, a first breaker QF1, a second breaker QF2, a third breaker QF3, a key switch S1, a normally open contact of a brake button SB1, a neutral switch SQ, an interlocking relay K2, a starting relay K1, a starter D, a normally closed contact of a first emergency stop button SB2, a normally closed contact of a second emergency stop button SB3, an engine controller ECU, a generator F, a time relay KT1, a control relay K3, a pressure relief solenoid valve Y1 and a power negative electrode, and a safety brake control loop of the underground trackless equipment is formed after the underground trackless equipment is stopped

The second branch circuit is a loop formed by a storage battery GB, a power main switch S, a fuse FU1, a breaker QF1/QF2/QF3, a key switch S1, a normally open contact of a brake button SB1, a neutral switch SQ, a normally closed contact of an interlocking relay K2, a starting relay K1, a starter D, a normally closed contact of an emergency stop button SB2, a normally closed contact of an emergency stop button SB3, an engine controller ECU, a generator F, a time relay KT1, a control relay K3, a pressure relief solenoid valve Y1 and a power negative electrode. No matter where the key switch is located, as long as the engine flameout condition appears, the D + end of the generator F does not have 24V voltage signal output, the time relay KT1 is powered off, the closed contact of the time relay KT1 is powered off 30S after the relay coil is powered off, the pressure relief electromagnetic valve Y1 is powered on in the process, the pressure of the energy accumulator is discharged, and the hydraulic brake loop does not have hydraulic oil equipment and is in a brake state.

As shown in fig. 3, the third branch comprises a power supply assembly, a power main switch S, a fuse FU1, a first breaker QF1, a second breaker QF2, a third breaker QF3, a key switch S1, a normally open contact of a brake button SB1, a neutral switch SQ, an interlock relay K2, a start relay K1, a starter D, a normally closed contact of a first emergency stop button SB2, a normally closed contact of a second emergency stop button SB3, an engine controller ECU, a generator F, a time relay KT1, a control relay K3, a pressure relief solenoid valve Y1, an interlock relay K4, a hydraulic brake circuit pressure switch KP1, a parking brake solenoid valve Y2, and a power negative electrode to form a safety brake control circuit of the underground trackless device after shutdown

The third branch circuit is composed of a storage battery GB, a power supply main switch S, a fuse FU1, a breaker QF1/QF2/QF3, a key switch S1, a normally open contact of a brake button SB1, a neutral switch SQ, a normally closed contact of an interlocking relay K2, a starting relay K1, a starter D, a normally closed contact of an emergency stop button SB2, a normally closed contact of an emergency stop button SB3, an engine controller ECU, a generator F, a time relay KT1, a control relay K3, a pressure relief solenoid valve Y1, an interlocking relay K4, a hydraulic brake loop pressure switch KP1, a parking brake solenoid valve Y2 and a power supply cathode to form a safety brake control loop after the underground trackless equipment is stopped, when the brake button SB1 or the emergency stop button SB2/SB3 is pressed or the parking brake is in any state, a coil of the starting interlocking relay K4 is controlled by an engine ECU signal J2 (48) and a J2 (33), when the engine speed is less than 300rpm, the ECU signal J2 (48) and a 24V-free voltage signal output coil K4 are in a coil, the electric coil is in a normally open state, a safety brake loop can be in a state, a safety brake function of the hydraulic brake loop can be realized, when the hydraulic brake loop is opened, and a safety brake loop can be in a safety brake loop can be opened, the safety brake system can be simultaneously, oil leakage can be prevented, and the safety brake loop can be prevented from being used when the safety brake loop can be simultaneously, and the safety brake loop can be prevented from being used.

The main content of this utility model is to provide a simple structure, convenient operation' S secret trackless equipment shut down safety brake controlling means, operating condition through judging the engine, key switch S1, generator F, time relay KT1, control relay K3 controls the circular telegram and the outage of pressure release solenoid valve Y1 and parking brake solenoid valve Y2, the pressure of energy storage ware pressure release automatic implementation braking or hydraulic braking return circuit is low when pressure release solenoid valve Y1 circular telegram, pressure switch KP1 is in normally open state and makes parking brake return circuit outage implement safety braking equally, thereby guarantee that secret trackless equipment shuts down the back equipment and realize automatic safety braking function.

When an engine of underground trackless equipment is started, a key switch S1 is selected to be rotated to a position of 3, a normally open contact of a parking brake button SB1 is pressed to be closed, a gear is arranged at the position of neutral gear, the neutral gear switch SQ is closed, the engine speed is 0rpm, an engine ECU outputs control signals J2 (48) and J2 (33) without voltage signal output, a normally closed contact of a coil of a relay K2 is closed in a power-off state, a normally open contact of a coil of a relay K4 is in an open state in the power-off state, and a normally open contact of the coil of the relay K1 is closed in the power-on state to start the engine. When the rotating speed of the engine reaches 300rpm after the engine is started, an ECU outputs control signals J2 (48) and J2 (33) to output 24V signals, a coil of a relay K2 is in an electrified state, a normally closed contact of the coil of the relay K4 is disconnected, a normally open contact of the coil of the relay K4 is closed in an electrified state, a pressure switch KP1 of a hydraulic braking loop is in a disconnected state, a D + end of a generator outputs 24V after the engine is parked, a normally open contact of the coil of a power-off delay time relay KT1 is electrified is closed, a normally closed contact of the coil of a relay K3 is electrified, the hydraulic braking loop cannot release pressure, the hydraulic system starts to charge an energy accumulator, and the pressure switch KP1 is closed after the pressure value reaches the system pressure, so that the safety braking of equipment and the secondary starting of the starter after the engine is started are effectively guaranteed.

When the engine of the equipment is normally flamed out, the key door returns to the position of 0, when the engine is abnormally flamed out, the key door stays at the position of I gear, and in order to prevent the situation that the power-off delay relay KT1 is still electrified and can not realize the engine shutdown safety braking function, the coil of the power-off delay relay KT1 is connected to the output signal D + end of the generator. As long as the engine stalls the generator D + end and does not have the voltage signal output of 24V, the coil of the time delay relay KT1 of the outage is cut off, its normally open contact time delay 30S breaks off, the control relay K3 coil loses the electricity its normally closed contact is closed to get electricity thus make the pressure relief solenoid valve Y1 get electricity, the energy accumulator begins the pressure relief equipment to implement the safety braking. When the engine is abnormally shut down, the rotating speed of the engine is 0rpm, the control signals J2 (48) and J2 (33) are output by 24V signals, the normally open contact of the coil of the relay K4 is in a disconnection state for the power-off state, the parking braking electromagnetic valve Y2 is powered off, the safety braking function of the equipment is also realized, and the safety problem of an operator and the equipment is greatly guaranteed.

It should be noted that, this utility model electrical diagram is as above shown, and components and parts have all been drawn for the protection, and the diesel engine is automatically controlled engine, and the braking mode of its bridge is spring brake hydraulic pressure release simultaneously, and pressure release solenoid valve Y1's working method is for getting electric pressure release, and parking solenoid valve Y2 working method is for getting electric driving outage parking.

The utility model provides a simple structure, convenient operation effectively prevents the safety brake controlling means that the trolley collided after trackless equipment shut down. The working state, the time relay, the relay and the pressure switch of the engine are judged to control the energization and the power-off of the pressure relief electromagnetic valve and the parking brake electromagnetic valve of the hydraulic brake loop, hydraulic oil of the hydraulic brake loop is discharged when the pressure relief electromagnetic valve is energized, parking brake is implemented when the parking brake electromagnetic valve is powered off, and therefore the safety brake function of the equipment in the shutdown state is guaranteed.

The utility model has the main advantages that: after the control device is adopted, the underground trackless equipment can be ensured to be automatically and safely braked after being stopped in normal work. When the engine is abnormally shut down, the safety automatic braking function of the equipment is realized through the interlocking control of the control signals of the power-off delay time relay and the generator. The scheme is simple and convenient to operate, and the safety performance of the scheme is more reliable. The safety brake function is mainly embodied in the abnormal shutdown state of the engine, and the condition that the engine or equipment which cannot be predicted by an operator suddenly stalls due to unsafe factors can be automatically and safely braked, so that the dangerous condition is effectively prevented.

The utility model discloses an engine abnormal flameout back, through outage time delay relay KT1, control relay K4 control hydraulic circuit pressure release solenoid valve Y1 and parking braking solenoid valve Y2 switching on-off to make braking system return circuit oil pressure let out and parking braking solenoid valve Y2 outage, equipment is automatic in the safety braking state.

To sum up, the utility model discloses a safety brake controlling means when underground trackless equipment engine shuts down back safety brake and the abnormal flame-out condition of engine. After the engine is stopped in any state, the coil of the interlocking relay K4 is de-energized, and the normally open contact of the interlocking relay is in a disconnected state to break a power supply loop of the parking solenoid valve Y2, so that the equipment is in a parking braking state; no voltage signal output exists at the D + end of the generator, the power-off delay time relay KT1 is powered off, the coil of the relay K3 is controlled to be powered off in a delayed mode, the pressure of the energy accumulator is discharged by the pressure relief electromagnetic valve after the engine is shut down, and the automatic safety braking function of the equipment is achieved.

In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

It will be understood by those skilled in the art that the invention, including any combination of the elements of the above description and the detailed description and illustrated in the accompanying drawings, is not limited to the details and should not be construed as limited to the embodiments set forth herein for the sake of brevity. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the invention, and that those skilled in the art may make variations, modifications, substitutions and alterations herein without departing from the spirit and scope of the invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (4)

1. The utility model provides an underground trackless equipment shutdown safety braking controlling means which characterized in that includes: a power supply assembly, a starter, a generator, a key switch, a brake button, a neutral position switch, a first interlocking relay, a second interlocking relay, a starting relay, a first emergency stop button, a second emergency stop button, an engine controller ECU, a time relay, a control relay, a pressure relief electromagnetic valve, a pressure switch and a parking electromagnetic valve,

wherein a starter and a generator are respectively connected in parallel between the positive polarity end and the negative polarity end of the power supply assembly, a first lead is further led out from the positive polarity end of the power supply assembly, the other end of the first lead is connected with the current input end of the key switch, a first branch, a second branch and a third branch are led out from the first current output end of the key switch,

wherein the first branch comprises: the positive pole of the power supply assembly is sequentially connected with a main power switch, a fuse, a first circuit breaker, a second circuit breaker, a key switch, a normally open contact of a brake button, a neutral position switch, a first interlocking relay, a starting relay, a starter, a normally closed contact of a first emergency stop button, a normally closed contact of a second emergency stop button, an engine controller ECU, a generator and a power supply negative pole in series to form a power supply loop of the whole circuit;

the second branch circuit includes: the system comprises a power supply assembly, a power supply main switch, a fuse, a first circuit breaker, a second circuit breaker, a third circuit breaker, a key switch, a normally open contact of a brake button, a neutral position switch, a first interlocking relay, a starting relay, a starter, a normally closed contact of a first emergency stop button, a normally closed contact of a second emergency stop button, an engine controller ECU (electronic control unit), a generator, a time relay, a control relay, a pressure relief electromagnetic valve and a power supply cathode, and a safety brake control loop of the underground trackless equipment after being stopped is formed;

the third branch includes: the system comprises a power supply assembly, a power supply main switch, a fuse, a first circuit breaker, a second circuit breaker, a third circuit breaker, a key switch, a normally open contact of a brake button, a neutral position switch, an interlocking relay, a starting relay, a starter, a normally closed contact of a first emergency stop button, a normally closed contact of a second emergency stop button, an engine controller ECU, a generator, a time relay, a control relay, a pressure relief electromagnetic valve, a second interlocking relay, a hydraulic brake circuit pressure switch, a parking brake electromagnetic valve and a power supply negative electrode, and a safety brake control circuit of the underground trackless equipment after the underground trackless equipment is stopped is formed.

2. A trackless underground equipment safety brake control as claimed in claim 1, wherein in the first branch, when the key switch S1 is in the "3" position, the brake button is in a depressed state with its normally open contacts closed, and the gear is in the neutral position with the neutral switch closed.

3. A safety brake control device for underground trackless equipment shutdown according to claim 1, characterized in that in the third branch, when no 24V voltage signal is output from an engine ECU signal, a relay coil is de-energized, and a normally open contact thereof is in an off state, and when oil leaks from a hydraulic brake circuit of the equipment to make the system pressure lower than the brake opening pressure, a pressure switch of the hydraulic brake circuit is in the off state, and a parking brake solenoid coil is de-energized.

4. A safety brake control device for underground trackless equipment shutdown as claimed in claim 1, wherein the key door returns to "0" position when the equipment engine is normally shut down, and stays in I-range position when the engine is abnormally shut down, and the coil of the power-off delay time relay KT1 is connected to the output signal D + terminal of the generator.

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