CN107351828B - Mining vehicle hydraulic system with automatic protection device for vehicle braking failure - Google Patents
Mining vehicle hydraulic system with automatic protection device for vehicle braking failure Download PDFInfo
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- CN107351828B CN107351828B CN201710344552.8A CN201710344552A CN107351828B CN 107351828 B CN107351828 B CN 107351828B CN 201710344552 A CN201710344552 A CN 201710344552A CN 107351828 B CN107351828 B CN 107351828B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
- B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
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- Mechanical Engineering (AREA)
- Regulating Braking Force (AREA)
- Braking Systems And Boosters (AREA)
Abstract
The invention belongs to the technical field of mining vehicle hydraulic systems, and provides a mining vehicle hydraulic system with an automatic protection device for vehicle braking failure, which aims to solve the technical problems that no safety braking measures exist and potential safety hazards exist when the existing mining vehicle hydraulic system fails and causes pressure loss. The invention can effectively protect the driving safety, has high automation degree and plays a role in protecting personnel and vehicles.
Description
Technical Field
The invention belongs to the technical field of mining vehicle hydraulic systems, and particularly relates to a mining vehicle hydraulic system with an automatic protection device for braking failure of a vehicle.
Background
The underground coal mine personnel carrier vehicle and the material carrier vehicle are widely used, but the underground coal mine ramp has a plurality of slopes and poor vehicle running conditions, and in the using process, accidents caused by braking failure occur, so that certain personnel and property losses are caused, and the underground coal mine ramp becomes a potential safety hazard of a modern mine.
The existing mining vehicle full-hydraulic braking system takes hydraulic oil generated by a hydraulic pump driven by a diesel engine as braking energy, and when the vehicle is started, high-pressure oil generated by the hydraulic pump driven by the engine charges liquid into two independent energy accumulators through a hydraulic valve to reach a specified value. When the vehicle brakes, the driver presses the foot brake pedal, high-pressure oil of the two energy accumulators respectively enters the front axle brake and the rear axle brake through the foot brake valve to push the piston to compress the friction disc, so that the vehicle brakes wheels.
When the hydraulic pipeline of the full hydraulic braking system is blocked and broken, the hydraulic system is out of pressure due to the fault; when the friction plate is in transitional wear failure and other problems, other standby safety braking measures are not available, and potential safety hazards exist. In addition, the underground pavement of the coal mine is narrow, the ramp is more, and once the braking fault occurs, the effective buffering and decelerating measures are lacking, so that the driving safety cannot be ensured.
Disclosure of Invention
The invention provides a mining vehicle hydraulic system with an automatic protection device for braking failure of a vehicle, which solves the technical problems that no safety braking measures exist and potential safety hazards exist when the existing mining vehicle hydraulic system fails to cause pressure loss.
The technical scheme adopted by the invention is as follows:
the mining vehicle hydraulic system comprises a hydraulic pump, a liquid filling valve, an energy accumulator I, an energy accumulator II, a service brake valve, a front wheel service brake, a rear wheel service brake and a vehicle brake failure automatic protection device, wherein the hydraulic pump is connected with the liquid filling valve, the liquid filling valve is respectively connected with the energy accumulator I and the energy accumulator II, the energy accumulator I is connected with the front wheel service brake through the service brake valve, the energy accumulator II is connected with the rear wheel service brake through the service brake valve, the vehicle brake failure automatic protection device comprises a pressure sensor I, a pressure sensor II, an explosion-proof electromagnetic valve I, an explosion-proof electromagnetic valve II, an air source, an air cylinder, a connecting rod mechanism and a drag coupler, the pressure sensor I is arranged between the service brake valve and the front wheel service brake, the pressure sensor II is arranged between the service brake valve and the rear wheel service brake, the pressure sensor I is connected with the explosion-proof electromagnetic valve I through the electromagnet II, the explosion-proof electromagnetic valve I is connected with the air source through the service brake valve I in series, the explosion-proof electromagnetic valve II is connected with the air source through the service brake valve, the air inlet end of the air cylinder, the connecting rod end of the explosion-proof electromagnetic valve II is connected with the piston of the air cylinder is connected with the piston end of the air cylinder, the drag coupler mechanism is arranged on the other end of the connecting rod mechanism, the drag coupler is convenient to be inserted into a connecting plate and fixed on the bottom of a pin shaft of a connecting plate is arranged on the vehicle, and the other end is fixed on the end of the connecting plate is conveniently to be welded on the bottom of a connecting plate is fixed by a connecting plate and is arranged on a vertical and has.
A manual reversing valve is arranged between the air source and the air cylinder, and the manual reversing valve is connected with an explosion-proof electromagnetic valve I and an explosion-proof electromagnetic valve II in parallel.
The invention has the beneficial effects that: when the vehicle braking fails, the vehicle hydraulic system can effectively protect the driving safety through effective braking, and the protection system has high degree of automation and protects personnel and vehicles.
Drawings
FIG. 1 is a schematic diagram of a hydropneumatic system of the present invention;
in the figure: the hydraulic system comprises a front wheel service brake, a rear wheel service brake, a 3-pressure sensor II, a 4-pressure sensor I, a 5-service brake valve, a 6-energy accumulator II, a 7-energy accumulator I, an 8-charging valve, a 9-hydraulic pump, a 10-air source, an 11-electromagnet I, a 12-electromagnet II, a 13-explosion-proof electromagnetic valve I, a 14-explosion-proof electromagnetic valve II, a 15-cylinder, a 16-connecting rod mechanism, a 17-towing coupler, a 18-pin shaft, a 19-vehicle bottom and a 20-manual reversing valve.
Detailed Description
As shown in fig. 1, a mining vehicle hydraulic system with an automatic protection device for vehicle brake failure comprises a hydraulic pump 9, a charging valve 8, an accumulator I7, an accumulator II6, a service brake valve 5, a front wheel service brake 1, a rear wheel service brake 2 and the automatic protection device for vehicle brake failure, wherein the hydraulic pump 9 is connected with the charging valve 8, the charging valve 8 is respectively connected with the accumulator I7 and the accumulator II6, the accumulator I7 is connected with the front wheel service brake 1 through the service brake valve 5, the accumulator II6 is connected with the rear wheel service brake 2 through the service brake valve 5, the automatic protection device for vehicle brake failure comprises a pressure sensor I4, a pressure sensor II3, an explosion-proof electromagnetic valve I13, an explosion-proof electromagnetic valve II14, an air source 10, an air cylinder 15, a connecting rod mechanism 16 and a drag 17, the pressure sensor I4 is arranged between the service brake valve 5 and the coupler 1, the pressure sensor II3 is arranged between the service brake valve 5 and the rear wheel service brake 2, the pressure sensor I4 is connected with the explosion-proof electromagnetic valve I13 through the electromagnet I11, the pressure sensor II3 is connected with the explosion-proof electromagnetic valve II14 through the electromagnet II12, the explosion-proof electromagnetic valve I13 is connected with the explosion-proof electromagnetic valve II14 in series, the explosion-proof electromagnetic valve I13 is connected with the air source 10, the explosion-proof electromagnetic valve II14 is connected with the air inlet end of the air cylinder 15, the piston rod end of the air cylinder 15 is connected with one end of the connecting rod mechanism 16, the other end of the connecting rod mechanism 16 is provided with a pin shaft 18, one end of the drag coupler 17 is hinged and fixed at the bottom 19 of the vehicle, the upper part of the other end of the drag coupler 17 is welded with a connecting plate perpendicular to the drag coupler 17, the upper end of the connecting plate is provided with a hanging ring which is convenient for the pin shaft 18 on the connecting rod mechanism 16 to pass through, the drag coupler 17 is inserted into a hanging ring on a connecting plate through a pin shaft 18 on the link mechanism 16 and is fixed at the bottom 19 of the vehicle.
The hydraulic pump 9 is driven by an engine, and the hydraulic pump 9 runs after the engine is started; the charging valve 8 is a double-way charging valve, and has the main functions of charging the accumulator I7 and the accumulator II6 and controlling charging pressure of the accumulator I and the accumulator II; the energy accumulator I7 and the energy accumulator II6 mainly have the functions of storing and releasing hydraulic energy required by braking, stabilizing braking oil pressure and ensuring a large amount of oil supply during continuous foot braking, and the front wheel service brake 1 and the rear wheel service brake 2 are provided with independent energy accumulators; the service brake valve 5 adopts a double-circuit service brake valve, and has the main function of controlling pressure oil in the accumulator I7 and the accumulator II6 to enter the front wheel service brake 1 and the rear wheel service brake 2 so as to realize vehicle braking, and if one brake circuit fails, the other brake circuit can still work. The front wheel service brake 1 and the rear wheel service brake 2 adopt the form of hydraulic braking and spring release, when the pedal of the double-loop service brake valve 5 is stepped on, pressure oil in the accumulator I7 and the accumulator II6 respectively enter the front wheel service brake 1 and the rear wheel service brake 2 through the upper cavity and the lower cavity of the valve, act on the brake piston, compress the friction plate to apply braking to the wheels, and the output braking pressure is proportional to the angle of the stepped on brake pedal. When the pedal is released, high-pressure oil in the brake flows back to the oil tank to release the brake.
The braking failure of the mining vehicle is mainly that when the oil pressure entering the front and rear wheel service brakes 1 and the rear wheel service brakes 2 is reduced to the pressure setting limit at the same time, the front wheel service brakes 1 and the rear wheel service brakes 2 lose braking at the same time, so that the whole vehicle is in a non-braking state, particularly when the vehicle descends a slope, the vehicle speed is out of control, and safety accidents caused by stall are caused.
Based on the principle, the principle is shown in fig. 1, when in a normal working state, the pressure sensor I4 and the pressure sensor II3 are both in normal values, the explosion-proof electromagnetic valve I13 and the explosion-proof electromagnetic valve II14 are not powered, the air source P10 is in an upper position, the air inlet of the air cylinder 15 is not pressurized, and the air source P10 is in a spring release state.
When the front driving brake pressure sensor I4 falls to a design value, a signal is sent to the explosion-proof electromagnetic valve I13, the electromagnet I11 is powered, the electromagnetic valve I13 is switched to the lower position, the air source P10 is communicated with the P2 of the explosion-proof electromagnetic valve II14 through P1 to A1 of the explosion-proof electromagnetic valve I13, and if the rear driving brake pressure is normal, the P2 is in a closed state, and then the air cylinder 15 does not act; only when the front and rear service brake pressures simultaneously reach the limit value, the pressure sensor I4 and the pressure sensor II3 simultaneously send signals, the electromagnet I11 and the electromagnet II12 of the explosion-proof electromagnetic valve I13 and the explosion-proof electromagnetic valve II14 are simultaneously powered on, the two valves are simultaneously reversed to the lower position, the air source P10 is communicated with the P2 of the explosion-proof electromagnetic valve II14 through the P1 to A1 of the explosion-proof electromagnetic valve I13, the P2 is communicated with the A2 to enter the air inlet P3 of the air cylinder 15, and the air cylinder 15 is pushed to act; the cylinder 15 is connected with a link mechanism 16 for fixing the towing coupler 17, and the link mechanism 16 moves towards the rear of the vehicle along with the pushing of the cylinder 15, so that a pin shaft 18 on the link mechanism 16 is driven to move backwards, and finally the towing coupler 17 loses the fixation of the pin shaft 18 and falls along with gravity. The dragging coupler 17 drops to hook the speed-limiting steel wire rope which is arranged in the roadway in advance, the speed-limiting steel wire rope which is connected with the two energy absorbers applies constant external force to the vehicle, and after a certain distance is buffered, the vehicle is braked in a decelerating way, and finally the vehicle is stopped.
In addition, for safety, a manual directional valve 20 is provided between the gas source 10 and the gas cylinder 15, the manual directional valve 20 being provided in parallel with the explosion-proof solenoid valve I13 and the explosion-proof solenoid valve II 14. The manual directional control valve 20 is in a closing state at ordinary times, when the limit condition that the normal braking and the vehicle braking failure protection device do not work occurs in the running process, a driver can operate in a cab, press an operating mechanism of the manual directional control valve 20, and the air source 10 enters the air cylinder 15 through the opened manual directional control valve 20.
When the vehicle braking fails, the vehicle hydraulic system can effectively protect the driving safety through effective braking, and the protection system has high degree of automation and protects personnel and vehicles.
Claims (2)
1. A mining vehicle hydraulic system with an automatic protection device against vehicle brake failure, characterized in that: comprises a hydraulic pump (9), a charging valve (8), an accumulator I (7), an accumulator II (6), a service brake valve (5), a front wheel service brake (1), a rear wheel service brake (2) and an automatic protection device for vehicle brake failure, wherein the hydraulic pump (9) is connected with the charging valve (8), the charging valve (8) is respectively connected with the accumulator I (7) and the accumulator II (6), the accumulator I (7) is connected with the front wheel service brake (1) through the service brake valve (5), the accumulator II (6) is connected with the rear wheel service brake (2) through the service brake valve (5), the automatic protection device for vehicle brake failure comprises a pressure sensor I (4), a pressure sensor II (3), an explosion-proof electromagnetic valve I (13), an explosion-proof electromagnetic valve II (14), an air source (10), an air cylinder (15), a connecting rod mechanism (16) and a drag coupler (17), the pressure sensor I (4) is arranged between the service brake valve (5) and the front wheel service brake (1), the pressure sensor II (3) is arranged between the service brake valve (5) and the rear wheel service brake (2) and the electromagnetic valve (2) through the explosion-proof electromagnetic valve I (11), the pressure sensor II (3) is connected with the explosion-proof electromagnetic valve II (14) through the electromagnet II (12), the explosion-proof electromagnetic valve I (13) is connected with the explosion-proof electromagnetic valve II (14) in series, the explosion-proof electromagnetic valve I (13) is connected with the air source (10), the explosion-proof electromagnetic valve II (14) is connected with the air inlet end of the air cylinder (15), the piston rod end of the air cylinder (15) is connected with one end of the connecting rod mechanism (16), the other end of the connecting rod mechanism (16) is provided with a pin shaft (18), one end of the dragging coupler (17) is hinged and fixed at the bottom (19) of the vehicle, the upper part of the other end of the dragging coupler (17) is perpendicular to the dragging coupler (17) and welded with a connecting plate, the upper end of the connecting plate is provided with a hanging ring which is convenient for the pin shaft (18) on the connecting rod mechanism (16) to pass through, and the dragging coupler (17) is inserted into the hanging ring on the connecting plate through the pin shaft (18) on the connecting rod mechanism (16) to be fixed at the bottom (19) of the vehicle;
when the front and rear service brake pressures simultaneously reach the limit value, the pressure sensor I (4) and the pressure sensor II (3) simultaneously send signals, the electromagnet I (11) and the electromagnet II (12) of the explosion-proof electromagnetic valve I (13) and the explosion-proof electromagnetic valve II (14) are simultaneously powered on, the two valves are simultaneously reversed to the lower position, the air source (10) is communicated with the P2 of the explosion-proof electromagnetic valve II (14) through the P1 to A1 of the explosion-proof electromagnetic valve I (13), the P2 is communicated with the A2 to enter the air inlet P3 of the air cylinder (15), and the air cylinder (15) is pushed to act; the cylinder (15) is connected with a connecting rod mechanism (16) for fixing the dragging coupler (17), the connecting rod mechanism (16) moves towards the rear part of the vehicle along with the pushing of the cylinder (15), a pin shaft (18) on the connecting rod mechanism (16) is driven to move backwards, the dragging coupler (17) finally loses the fixation of the pin shaft (18), the dragging coupler (17) drops along with gravity and hooks a speed-limiting steel wire rope which is arranged in a roadway in advance, the speed-limiting steel wire rope for connecting the two energy absorbers applies constant external force to the vehicle, and the vehicle is braked slowly until the vehicle stops after a certain distance is buffered.
2. A mining vehicle hydraulic system having an automatic vehicle brake fail-safe device as defined in claim 1, wherein: a manual reversing valve (20) is arranged between the air source (10) and the air cylinder (15), and the manual reversing valve (20) is connected with an explosion-proof electromagnetic valve I (13) and an explosion-proof electromagnetic valve II (14) in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710344552.8A CN107351828B (en) | 2017-05-16 | 2017-05-16 | Mining vehicle hydraulic system with automatic protection device for vehicle braking failure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710344552.8A CN107351828B (en) | 2017-05-16 | 2017-05-16 | Mining vehicle hydraulic system with automatic protection device for vehicle braking failure |
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| Publication Number | Publication Date |
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| CN107351828A CN107351828A (en) | 2017-11-17 |
| CN107351828B true CN107351828B (en) | 2023-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710344552.8A Active CN107351828B (en) | 2017-05-16 | 2017-05-16 | Mining vehicle hydraulic system with automatic protection device for vehicle braking failure |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109610966B (en) * | 2018-11-20 | 2020-05-08 | 中国煤炭科工集团太原研究院有限公司 | Safety linkage device for controlling opening and closing of passenger compartment door by gas and liquid for mining explosion-proof man car |
| CN109435928B (en) * | 2018-12-29 | 2024-04-30 | 徐工集团工程机械股份有限公司 | Unmanned vehicle electrohydraulic braking system |
| CN112477912B (en) * | 2020-11-26 | 2021-11-23 | 湘潭市恒欣实业有限公司 | Passive braking system of railway vehicle |
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