Brake system for underground mine car

Abstract

The utility model belongs to the technical field of mining transportation equipment, and particularly relates to a braking system for an underground mine car, which comprises an oil tank, a foot valve and a brake, a hydraulic pump is arranged at an outlet of the oil tank and is a load-sensitive plunger pump, an inlet of the hydraulic pump is connected with an outlet of the oil tank through a hydraulic pipeline, and an outlet of the hydraulic pump is connected with a sequence valve. The load-sensitive variable pump is arranged, displacement is adjusted according to requirements of a system, the sequence valve is arranged at the same time, after system pressure reaches a set value, the liquid filling valve and the energy accumulator are sequentially arranged on the downstream portion of the sequence valve, the pedal valve is connected with the brake, a pressure relief opening of the pedal valve is connected with the oil tank, and an oil inlet of the pedal valve is connected with the liquid filling valve. The control system supplies oil to external hydraulic components, and power waste is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of mining transportation equipment, in particular to a braking system for underground mining vehicles. Background Art

[0002] Underground ore trucks are a type of mining machinery specifically used for mining and transportation. They play a vital role in mining operations and are core equipment for ensuring the efficient transportation of mineral resources. Due to their heavy weight and load capacity, and the harsh working environment, the safety and reliability of the braking system are particularly important. Hydraulic braking systems can provide large output force and high stability, and are widely used in underground ore trucks and other mining machinery.

[0003] Since the braking system of mining machinery and equipment uses a spring-activated, hydraulic-released model, when the vehicle stops, the spring in the brake acts to clamp the brake pads against the brake disc to implement the parking brake. Before the vehicle moves, the pressure provided by the hydraulic system offsets the spring force, causing the brake pads to separate from the brake disc and release the brake. To meet the demand for short-term large-scale oil supply, an accumulator is generally installed in the braking system. The hydraulic pump first fills the accumulator with oil. When the oil pressure in the accumulator reaches the set value, the system starts to release the pressure. At this time, the hydraulic energy in the system no longer participates in energy conversion, resulting in energy loss and reducing the energy conversion efficiency of the system. Utility Model Content

[0004] The main technical problem to be solved by the utility model is to provide a braking system for underground mining vehicles. By setting a load-sensitive variable pump, the displacement is adjusted according to system requirements. At the same time, a sequence valve is set. After the system pressure reaches the set value, the control system supplies oil to the external hydraulic components to reduce power waste.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A braking system for an underground mining vehicle comprises an oil tank, a foot valve and a brake. A hydraulic pump is provided at the outlet of the oil tank. The hydraulic pump is a load-sensitive plunger pump. The inlet of the hydraulic pump is connected to the outlet of the oil tank through a hydraulic pipeline. The outlet of the hydraulic pump is connected to a sequence valve. A charging valve and an accumulator are provided downstream of the sequence valve in sequence. The foot valve is connected to the brake. The pressure relief port of the foot valve is connected to the oil tank. The oil inlet of the foot valve is connected to the charging valve.

[0007] The following is a further optimization of the above technical solution by the present invention:

[0008] The sequence valve is provided with a first oil inlet, a feedback port, a first oil outlet, a second oil outlet and a first pressure relief port. The first oil inlet and the feedback port are respectively connected to the hydraulic pump through hydraulic pipelines.

[0009] Further optimization: a filter is provided between the sequence valve and the filling valve, the inlet of the filter is connected to the first oil outlet of the sequence valve, and the outlet of the filter is connected to the inlet of the filling valve.

[0010] Further optimization: the second oil outlet of the sequence valve is connected to the external hydraulic component through a hydraulic pipeline, and the first pressure relief port of the sequence valve is connected to the filling valve through a hydraulic pipeline.

[0011] Further optimization: The braking system also includes an emergency motor pump, the inlet of the emergency motor pump is connected to the oil tank, and the outlet of the emergency motor pump is connected to a relief valve.

[0012] Further optimization: Two brake solenoid valves are integrated into the filling valve to control the parking brakes of the front and rear axles respectively.

[0013] Further optimization: the brake includes a front axle brake and a rear axle brake.

[0014] The utility model adopts the above technical solution, which has the following beneficial effects:

[0015] The hydraulic pump of the utility model adopts a load-sensitive plunger pump, which can adjust the pressure and flow of the output hydraulic oil according to the size of the system load, thereby improving the efficiency of the system, reducing energy consumption, and ensuring the stability and reliability of the system.

[0016] The brake system of the present invention is provided with a sequence valve, which controls the hydraulic pump to give priority to filling the charging valve and accumulator to ensure the reliability of the brake system. When the pressure of the charging valve reaches the set value, the sequence valve is reversed and the hydraulic pump supplies oil to the external hydraulic components, further improving the energy utilization rate.

[0017] The filling valve of the utility model has two built-in brake solenoid valves, which respectively control the parking brakes of the front axle and the rear axle. When one of the oil circuits of the front axle or the rear axle fails, the other oil circuit can still brake normally, thereby improving the reliability of the system.

[0018] The braking system of the present invention is also provided with an emergency motor pump. When the vehicle engine fails, the hydraulic pump cannot work. At this time, the emergency motor pump is started to supply oil to the braking system instead of the hydraulic pump, so that the vehicle can be quickly released from the brakes and towed to the maintenance site.

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model.

[0021] In the figure: 1. Oil tank; 2. Hydraulic pump; 3. Sequence valve; 301. First oil inlet; 302. Feedback port; 303. First oil outlet; 304. Second oil outlet; 305. First pressure relief port; 306. Reversing valve; 4. Filter; 5. Filling valve; 501. Brake solenoid valve; 6. Accumulator; 7. Foot valve; 8. Brake; 801. Front axle brake; 802. Rear axle brake; 9. Emergency motor pump; 10. Overflow valve. DETAILED DESCRIPTION

[0022] like Figure 1 As shown, a braking system for an underground mining vehicle includes a fuel tank 1. A hydraulic pump 2 is provided at the outlet of the fuel tank 1. The inlet of the hydraulic pump 2 is connected to the outlet of the fuel tank 1 through a hydraulic pipeline. The hydraulic pump 2 converts the mechanical energy output by the engine into hydraulic energy, so that the hydraulic oil in the fuel tank 1 is transported out at a certain pressure and flow rate for use by the entire system.

[0023] In this embodiment, the hydraulic pump 2 is a load-sensitive plunger pump. The load-sensitive plunger pump senses the size of the system load and adjusts its output pressure and flow to provide hydraulic oil that meets the system requirements. This design can improve the efficiency of the system, reduce energy consumption, and ensure the smoothness and reliability of the system operation.

[0024] The outlet of the hydraulic pump 2 is connected to a sequence valve 3, which is provided with a first oil inlet 301, a feedback port 302, a first oil outlet 303, a second oil outlet 304 and a first pressure relief port 305. The first oil inlet 301 is connected to the outlet of the hydraulic pump 2 through a hydraulic pipeline to form a hydraulic passage; the feedback port 302 is connected to the hydraulic pump 2 through a hydraulic pipeline to feed back the system load information to the hydraulic pump 2 so that the hydraulic pump 2 can adjust the output pressure and flow.

[0025] The first oil outlet 303 of the sequence valve 3 is connected to a filter 4 through a hydraulic pipeline, and the second oil outlet 304 is connected to an external hydraulic component through a hydraulic pipeline. The filter 4 is used to filter out large particles in the hydraulic oil to ensure the cleanliness of the hydraulic oil passing through the brake system, prevent malfunctions such as valve sticking, and increase the reliability of the brake system.

[0026] The outlet of the filter 4 is connected to the charging valve 5 and the accumulator 6 in sequence through a hydraulic pipeline, and the first pressure relief port 305 of the sequence valve 3 is connected to the charging valve 5 through a hydraulic pipeline.

[0027] Initially, the hydraulic pump 2 works to deliver the hydraulic oil to the first oil inlet 301 of the sequence valve 3. A reversing valve 306 is provided in the sequence valve 3. Since the pressure of the first oil inlet 301 is less than the pressure of the pressure-regulating spring inside the reversing valve 306, the valve core remains in a closed state, and the hydraulic oil flows out from the first oil outlet 303 and enters the filter 4 to charge the downstream charging valve 5 and accumulator 6; when the pressure in the charging valve 5 reaches the set upper limit value, the hydraulic oil flowing through the sequence valve 3 flows into the charging valve 5 through the first pressure relief port 305 to relieve the pressure, and the reversing valve 306 in the sequence valve 3 is reversed, and the first oil inlet 301 is connected to the second oil outlet 304. At this time, the hydraulic oil delivered by the hydraulic pump 2 is used by external hydraulic components.

[0028] The braking system of the present invention also includes a foot valve 7 and a brake 8. The foot valve 7 and the brake 8 are connected through a hydraulic pipeline. The inlet of the foot valve 7 is connected to the filling valve 5, and the pressure relief port of the foot valve 7 is connected to the oil tank 1. The brake 8 includes a front axle brake 801 and a rear axle brake 802, which are used to control the service braking of the front axle and the rear axle respectively. When service braking is required, the driver steps on the foot valve 7, and the hydraulic oil in the brake 8 is relieved through the foot valve 7. At this time, the hydraulic pressure in the brake 8 cannot balance the force of the brake spring, and the brake spring implements braking.

[0029] When the service brake needs to be released, the foot valve 7 is released, the valve core of the foot valve 7 is reversed, and the hydraulic oil stored in the accumulator 6 is delivered to the brake 8 through the foot valve 7. The pressure of the hydraulic oil is used to balance the force of the brake spring and release the brake. After several braking operations, the pressure in the accumulator 6 drops to the set value, the valve core in the sequence valve 3 returns to the closed state, and the hydraulic pump 2 works to fill the downstream charging valve 5 and accumulator 6 again.

[0030] Two brake solenoid valves 501 for parking brake are integrated in the filling valve 5, so that the parking brakes of the front axle and the rear axle can be controlled separately, avoiding the failure of braking of both axles due to a fault in one oil circuit of the front axle or the rear axle, thereby improving the reliability of the system.

[0031] The filling valve 5 is also integrated with a pressure sensor and a pressure switch, and is connected to the display screen signal in the cab. The pressure information of the braking system can be transmitted to the display screen in real time, making it easier for the driver to understand the braking condition of the vehicle and improving driving comfort and safety.

[0032] In order to ensure that the brakes can be quickly released and the vehicle can be towed to a repair site when the vehicle engine fails, the braking system also includes an emergency motor pump 9. The inlet of the emergency motor pump 9 is connected to the oil tank 1, which is used to replace the hydraulic pump 2 to provide hydraulic oil to the braking system when the engine fails.

[0033] The outlet of the emergency motor pump 9 is connected to a relief valve 10 , which is used to limit the system pressure when the emergency motor pump 9 is working, thereby ensuring the safety of the system.

[0034] For ordinary technicians in this field, based on the teachings of this utility model, without departing from the principles and spirit of this utility model, changes, modifications, substitutions and variations made to the implementation methods are still within the scope of protection of this utility model.

Claims

1. A braking system for an underground mining vehicle, comprising a fuel tank (1), a pedal valve (7) and a brake (8), wherein a hydraulic pump (2) is provided at the outlet of the fuel tank (1), the hydraulic pump (2) being a load-sensitive plunger pump, and an inlet of the hydraulic pump (2) being connected to the outlet of the fuel tank (1) via a hydraulic pipeline, and characterized in that: The outlet of the hydraulic pump (2) is connected to a sequence valve (3), a charging valve (5) and an accumulator (6) are sequentially arranged downstream of the sequence valve (3), a foot valve (7) is connected to a brake (8), a pressure relief port of the foot valve (7) is connected to an oil tank (1), and an oil inlet of the foot valve (7) is connected to the charging valve (5).

2. The braking system for an underground mining vehicle according to claim 1, characterized in that: The sequence valve (3) is provided with a first oil inlet (301), a feedback port (302), a first oil outlet (303), a second oil outlet (304) and a first pressure relief port (305). The first oil inlet (301) and the feedback port (302) are respectively connected to the hydraulic pump (2) via hydraulic pipelines.

3. The braking system for an underground mining vehicle according to claim 2, characterized in that: A filter (4) is provided between the sequence valve (3) and the filling valve (5), the inlet of the filter (4) is connected to the first oil outlet (303) of the sequence valve (3), and the outlet of the filter (4) is connected to the inlet of the filling valve (5).

4. The braking system for an underground mining vehicle according to claim 3, characterized in that: The second oil outlet (304) of the sequence valve (3) is connected to an external hydraulic component via a hydraulic pipeline, and the first pressure relief port (305) of the sequence valve (3) is connected to the filling valve (5) via a hydraulic pipeline.

5. The braking system for an underground mining vehicle according to claim 4, characterized in that: The braking system further comprises an emergency motor pump (9), an inlet of the emergency motor pump (9) is connected to the oil tank (1), and an outlet of the emergency motor pump (9) is connected to a relief valve (10).

6. The braking system for an underground mining vehicle according to claim 5, characterized in that: Two brake solenoid valves (501) are integrated in the filling valve (5) and are used to control the parking brakes of the front axle and the rear axle respectively.

7. The braking system for an underground mining vehicle according to claim 6, characterized in that: The brake (8) comprises a front axle brake (801) and a rear axle brake (802).

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