CN108501908A - The anti-lock and energy regenerating brake fluid system of mining electric locomotive - Google Patents

Abstract

The invention provides an anti-lock and energy recovery hydraulic braking system of a mining electric locomotive, which has the characteristics of safety, reliability and production efficiency under the condition of satisfying the braking force. The anti-lock subsystem includes the anti-lock subsystem and the energy recovery subsystem; the anti-lock subsystem includes the brake pedal, the brake master cylinder, the three-position three-way solenoid valve and the liquid reservoir, the brake pedal is connected to the brake master cylinder, and the three Three-position three-way solenoid valves are respectively connected to the brake master cylinder, wheel brakes and liquid reservoirs through pipelines. The oil supply end of the cylinder is connected to the liquid reservoir through the first pump and the pipeline; the energy recovery subsystem includes the driving axle arranged between the wheels and the driving motor arranged on the vehicle, the driving motor is connected to the wheel shaft through the transmission device, and the wheel shaft is connected to the wheel shaft through the driving axle and the clutch connection, the oil inlet end of the second pump is connected to the fuel tank, and the oil outlet end of the second pump is connected to the accumulator; the accumulator is also connected to the wheel brake.

Description

Anti-lock braking and energy recovery hydraulic braking system for mining electric locomotive

technical field

The invention relates to a hydraulic braking system, in particular to an anti-lock and energy recovery hydraulic braking system of a mining electric locomotive, and belongs to the technical field of mining electric locomotives.

Background technique

Rail transportation is still the most important and extensive transportation mode in modern coal mines, and it can adapt to the change of transportation distance and the curvature of the roadway. There are millions of mine cars running on the coal mine track, and the braking system is the most closely related to the active safety of the vehicle during the operation of the vehicle. The braking performance of the vehicle is an important indicator of the driving safety of the vehicle. index of.

At present, the traction locomotive for underground track is provided by the traction head and realizes mechanical braking. The mechanical braking system mainly includes the brake shoe and the brake control mechanism. The control methods of the brake shoe brake device include manual, pneumatic, and hydraulic control. three kinds. Its main problems are insufficient power, poor braking performance, large operation advance, and difficulty in controlling the vehicle in case of emergency. Moreover, the special operating conditions and harsh working environment in coal mines require higher braking requirements for underground vehicles. In addition to meeting certain braking force conditions, explosion-proof, pollution-proof, safety and reliability must also be considered.

Therefore, the research on the braking system of underground rail vehicles is very important. The improved design and optimization of the braking system can not only effectively improve the safety of underground transportation and ensure safe production; it can also reduce the failure rate of underground transportation vehicles, greatly Improve production efficiency and bring economic benefits.

Contents of the invention

The object of the present invention is to provide an anti-lock and energy recovery hydraulic braking system for a mining electric locomotive, which has the characteristics of safety, reliability and production efficiency under the condition of satisfying the braking force.

The present invention is realized through the following technical solutions:

An anti-lock braking and energy recovery hydraulic braking system for a mining electric locomotive, including an anti-lock braking subsystem and an energy recovery subsystem; wherein the anti-lock braking subsystem includes a brake pedal, a brake master cylinder, a three-position three-way The solenoid valve is connected to the liquid reservoir, the brake pedal and the brake master cylinder. The three-position three-way solenoid valve is connected to the brake master cylinder, wheel brake and liquid reservoir respectively through pipelines. The three-position three-way solenoid valve can Realize three working states of pressurization, pressure maintenance and decompression. The oil supply end of the brake master cylinder is connected to the reservoir through the first pump and the pipeline, and the first pump is connected to the brake motor as the power source of the first pump; energy recovery The subsystem includes a drive axle arranged between the wheels and a drive motor arranged on the vehicle. The drive motor is connected to the wheel shaft through the transmission device, and the wheel shaft is connected to the second pump through the drive axle and the clutch as the power source of the second pump. The second pump enters the The oil end is connected to the fuel tank, and the oil outlet of the second pump is connected to the accumulator; the accumulator is also connected to the wheel brake.

The preferred scheme of the anti-lock braking and energy recovery hydraulic braking system for mining electric locomotives. A normally open solenoid valve is installed on one oil circuit of the wheel brakes to control the flow of pressure oil from the wheel brakes to the fluid reservoir. The wheel brakes also have an oil circuit. There is a normally closed solenoid valve in the circuit, which is used to control the flow of pressure oil from the accumulator to the wheel brake.

The preferred scheme of anti-lock braking and energy recovery hydraulic braking system for mining electric locomotives, which also includes a controller, the sensor is installed on the wheel, the sensor is installed on the wheel and connected to the input end of the controller, and the measured vehicle speed is fed back to the controller , the output of the controller is connected to the normally open solenoid valve and the normally closed solenoid valve.

The preferred scheme of the anti-lock and energy recovery hydraulic braking system for electric locomotives used in mines. The inlet of the second pump is connected to the oil tank through the filter, and the outlet of the second pump is connected to the check valve. The oil circuit outlet of the check valve is divided into two branches. Oil circuit, one branch oil circuit is connected with the accumulator, and the other branch oil circuit is connected with the fuel tank and is provided with an overflow valve.

The preferred scheme of the anti-lock and energy recovery hydraulic braking system of the mining electric locomotive, the oil outlet of the first pump is connected with a one-way control valve.

In the preferred scheme of the anti-lock braking and energy recovery hydraulic braking system of the mining electric locomotive, there are two wheel brakes, which are arranged on the wheels.

The advantage of the present invention is that: the three-position three-way solenoid valve can be in three working states, so that the pressure of the brake master cylinder is near the set value, which plays the role of anti-lock, and the energy storage device is used to store the deceleration process of the mining electric locomotive. The kinetic energy is converted into hydraulic energy, and the controller controls the pressure oil of the accumulator to enter the wheel brakes, so that the mining electric locomotive can be braked; it can not only effectively improve the safety of underground transportation and ensure safe production; it can also reduce The failure rate of underground transportation vehicles greatly improves production efficiency and brings economic benefits.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, and are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention.

Figure 1 is a schematic diagram of the hydraulic anti-lock braking system of a mining electric locomotive.

Figure 2 is a schematic diagram of the principle of hydraulic energy recovery.

In the figure: 1. Brake pedal; 2. Brake master cylinder; 3. Hydraulic pipeline; 4. Three-position three-way solenoid valve; 5. Brake motor; 6. First pump; 7. One-way control valve 7 ;8, liquid reservoir; 9, normally open solenoid valve; 10, normally closed solenoid valve; 11, wheel brake; 12, sensor; 13, wheel; 14, controller; 15, accumulator; 16, drive Motor; 17, transmission; 18, drive axle; 19, axle; 20, clutch; 21, oil tank; 22, filter; 23, second pump; 24, one-way valve; 25, overflow valve.

Detailed ways

The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

Referring to Fig. 1, an anti-lock braking and energy recovery hydraulic braking system of a mining electric locomotive includes an anti-lock braking subsystem and an energy recovery subsystem; wherein the anti-lock braking subsystem includes a brake pedal 1, a brake master cylinder 2. The three-position three-way solenoid valve 4 and the liquid reservoir 8 are connected to the brake pedal 1 and the brake master cylinder 2, and the three-position three-way solenoid valve 4 is respectively connected to the brake master cylinder 2, the wheel brake 11 and the brake master cylinder 2 through the hydraulic pipeline 3. The liquid reservoir 8 and the three-position three-way solenoid valve 16 can realize three working states of boosting, pressure maintaining and decompression by changing the current. The oil supply end of the brake master cylinder 2 is connected to the liquid storage through the first pump 6 and the pipeline. 8, the first pump 6 is connected to the brake motor 5 as the power source of the first pump 6; the energy recovery subsystem includes a drive axle 18 arranged between the wheels 13, a drive motor 16 arranged on the vehicle, and the drive motor 16 passes through The transmission device 17 is connected to the axle 19, and the axle 19 is connected to the second pump 23 as the power source of the second pump through the drive axle 18 and the clutch 20. The oil inlet end of the second pump 23 is connected to the fuel tank 21, and the oil outlet end of the second pump 23 is connected to the energy storage 15; the accumulator 15 is also connected to the wheel brake 11.

In this embodiment, a normally open electromagnetic valve 9 is provided on one oil circuit of the wheel brake 11 to control the flow of pressure oil from the wheel brake to the liquid reservoir 8, and an oil channel of the wheel brake 11 is provided with a normally closed electromagnetic valve 10. It is used to control the flow of pressure oil from the accumulator 15 to the wheel brakes 11 .

In the present embodiment, also comprise controller 14, sensor 12 is located at wheel 13, and sensor 12 is located at wheel 13 and is connected with controller 14 input end and the measured vehicle speed is fed back to controller 14, and the output end of controller 3 is connected To normally open solenoid valve 9 and normally closed solenoid valve 10. The controller 14 controls the working state of the normally open solenoid valve 9 to keep the pressure of the brake master cylinder 2 at an appropriate value, and the controller 14 controls the working state of the normally closed solenoid valve 10 so that the pressure oil of the accumulator 15 enters the brake, The mine electric locomotive is braked.

In this embodiment, the inlet of the second pump 23 is connected to the oil tank 21 through the filter 22, and the outlet of the second pump 23 is connected to the one-way valve 24. The accumulator 15 and the other oil branch communicate with the oil tank 21 and are provided with an overflow valve 25 . The one-way valve 24 prevents the hydraulic oil of the accumulator 15 from flowing backward.

In this embodiment, the oil outlet end of the first pump 6 is connected with a one-way control valve 7 .

In this embodiment, there are two wheel brakes 11 , which are arranged on the wheels 13 .

In the normal driving state of the mine electric locomotive, the drive motor 16 is used as a power source, and the wheel shaft 19 and the wheel 13 are driven to rotate through the transmission device 17, so that the locomotive runs normally on the track; Electricity loses power, the clutch is connected, and the mine electric locomotive is still in a state of motion under the state of inertia. The kinetic energy of the mine electric locomotive is transmitted through the drive axle 18 and the clutch 20, driving the second pump 23 to work, and the second pump 23 extracts The pressure oil in the oil tank 21 is delivered to the accumulator 15 through the hydraulic pipeline and the one-way valve 24 for storage. If the pressure in the accumulator 15 exceeds a limit value, it can be discharged into the oil tank 21 through the overflow valve 25 . When the mining electric locomotive is on a curve or a road section that requires conventional deceleration, the controller 14 receives an order to drive the normally open high-speed switch solenoid valve 9 to close, and the normally closed solenoid valve 10 to open, and then the pressure oil in the accumulator 15 enters the brake 11. Make the friction plate in the brake 11 press the brake disc to achieve braking. After braking, the normally open solenoid valve 9 is opened and the normally closed solenoid valve 10 is closed, and the pressure oil in the brake 11 can be discharged into the liquid reservoir 8 through the normally open solenoid valve 9, so that the mine electric locomotive can operate normally. run. When the mining electric locomotive is in emergency braking, the drive motor 16 is powered off and loses power, the driver steps on the brake pedal 1, the brake pedal 1 drives the piston movement in the brake master cylinder 2, and the pressure oil in the brake master cylinder 2 The three-position three-way solenoid valve 4 flows to the brake 11 to realize the braking of the mining electric locomotive; when the driver continues to step on the brake pedal 1 hard, the oil pressure in the brake 11 will be too large, the wheels 13 will be locked, and the sensor 12 Detecting that the wheel 13 is locked, the sensor 12 transmits the signal to the controller through the signal line 14, and the controller controls the working state of the three-position three-way solenoid valve 4, so that the brake 11 communicates with the liquid reservoir 8, and the pressure oil in the brake 11 It is discharged into the liquid reservoir 8, so that the three-position three-way solenoid valve 4 can realize the conversion of each working state under the control of the controller, and realize the boosting, pressure maintaining and decompression of the brake, so that the emergency brake of the mine electric locomotive Move to anti-lock. When the brake pedal 1 of the mining electric locomotive fails to brake, the controller 14 controller receives an order to drive the normally open high-speed switch solenoid valve 9 to close, and the normally closed high-speed switch solenoid valve 10 to open, and then the accumulator 15 The pressure oil enters the brake 11, so that the friction plate in the brake 11 presses the brake disc to achieve braking.

Finally, it should be noted that: the above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still The technical solutions recorded in the foregoing embodiments may be modified, or some technical features thereof may be equivalently replaced. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (6)

1. an anti-lock braking and energy recovery hydraulic braking system of a mining electric locomotive, characterized in that: comprise an anti-lock braking subsystem and an energy recovery subsystem; wherein The anti-lock braking subsystem includes brake pedal (1), brake master cylinder (2), three-position three-way solenoid valve (4) and fluid reservoir (8), brake pedal (1) brake master cylinder (2 ), the three-position three-way solenoid valve (4) is connected to the brake master cylinder (2), wheel brake (11) and fluid reservoir (8) respectively through pipelines, and the three-position three-way solenoid valve (16) changes the current The size can realize three working states of pressurization, pressure maintenance and decompression. The oil supply end of the brake master cylinder (2) is connected to the liquid reservoir (8) through the first pump (6) and the pipeline, and the first pump (6) Connect the braking motor (5) as the power source of the first pump (6); The energy recovery subsystem includes a drive axle (18) arranged between the wheels (13), a drive motor (16) arranged on the vehicle, the drive motor (16) is connected to the wheel shaft (19) through the transmission device (17), and the wheel shaft ( 18) Connect the second pump (23) through the drive axle (18) and clutch (20) as the power source of the second pump, the oil inlet end of the second pump (23) is connected to the oil tank (21), and the outlet of the second pump (23) The oil end is connected to the accumulator (15); The accumulator (15) is also connected to the wheel brakes (11). 2. according to the anti-lock braking system of the mine electric locomotive described in claim 1 and the energy recovery hydraulic braking system, it is characterized in that: the wheel brake (11) is provided with a normally open solenoid valve (9) on an oil circuit for controlling The pressure oil flows from the wheel brake to the liquid reservoir (8), and the wheel brake (11) also has a normally closed solenoid valve (10) in the oil circuit, which is used to control the flow of pressure oil from the accumulator (15) to the wheel brake (11 ). 3. the anti-lock braking and energy recovery hydraulic braking system of mine electric locomotive according to claim 2, is characterized in that: it also comprises controller (14), and sensor (12 is located at wheel (13), and sensor (12 The wheel (13) is connected to the input end of the controller (14) and the measured vehicle speed is fed back to the controller (14), and the output end of the controller (3) is connected to the normally open solenoid valve (9) and the normally closed Type solenoid valve (10). 4. the antilock and energy recovery hydraulic braking system of electric locomotive for mining according to claim 1, is characterized in that: the inlet of the second pump (23) is connected to the oil tank (21) through the filter (22), and the second pump The outlet of (23) connects check valve (24), and the oil passage outlet of check valve (24) is divided into two branch oil passages, and one branch oil passage connects accumulator (15), and another branch oil passage and fuel tank ( 21) are communicated and are provided with an overflow valve (25). 5. According to the anti-lock braking and energy recovery hydraulic braking system of any one of claims 1 to 4, the mining electric locomotive is characterized in that: the oil outlet of the first pump (6) is connected with a one-way control valve (7) . 6. According to the anti-lock braking and energy recovery hydraulic braking system of the mine electric locomotive according to any one of claims 1 to 4, it is characterized in that: there are two wheel brakes (11), which are arranged on the wheels (13).