A brake system for a medium-duty mine haul truck

Abstract

This utility model relates to the technical field of hydraulic systems for trackless underground equipment, specifically a braking system suitable for medium-sized mining trucks in underground mines. It includes a hydraulic oil tank, a dual-pump system, a high-pressure filter, a filling valve, an accumulator, a service brake valve, a parking brake valve, a front axle brake, and a rear axle brake. The dual-pump system includes a main pump and an auxiliary pump. The outlet of the hydraulic oil tank is connected to the inlet of the main pump, which is sequentially connected to the high-pressure filter and the filling valve. The filling valve is connected to the accumulator and the service brake valve. The service brake valve is connected to the front axle brake and the rear axle brake, providing braking hydraulic oil to both. The inlet of the auxiliary pump is connected to the outlet of the hydraulic oil tank, and the outlet of the auxiliary pump is connected to port A of the front axle brake, providing cooling hydraulic oil to the front axle brake. The outlet B1 of the accumulator is connected to the inlet A1 of the parking brake valve, and port B of the parking brake valve is connected to a brake disc, realizing the parking brake function.

Description

Technical Field

[0001] This utility model relates to the technical field of hydraulic systems for trackless underground equipment, specifically a braking system suitable for medium-sized mining trucks in underground mines. Background Technology

[0002] The braking system of trackless equipment in underground mines is an indispensable part of the equipment's driving and parking braking, and its performance directly affects the safety and reliability of the equipment's operation. In the application scenarios of medium-sized mining trucks in underground mines, due to the complex underground working conditions, higher requirements are placed on the stability, reliability, and adaptability of the braking system.

[0003] Traditional braking systems for medium-sized underground mining trucks generally suffer from numerous defects. On one hand, excessively high braking system pressure not only increases the load on system components and accelerates wear, but also leads to an uneven braking process and affects braking performance. On the other hand, cross-contamination between hydraulic fluid and transmission fluid is common. This alters the properties of the hydraulic fluid, significantly reducing the performance and effectiveness of the braking system and seriously impacting the safe operation of the entire vehicle.

[0004] Furthermore, traditional braking systems suffer from short service life and inconvenient maintenance, which not only increases operating costs but also affects the normal operating efficiency of equipment. Therefore, there is an urgent need for a braking system that can solve these problems, possesses reliable braking performance, a long service life, and convenient maintenance, to meet the practical application needs of medium-sized mining trucks in underground mines. Utility Model Content

[0005] The purpose of this invention is to provide a braking system suitable for medium-sized underground mining trucks, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a braking system suitable for medium-sized mining trucks used underground, comprising a hydraulic oil tank, a dual oil pump, a high-pressure oil filter, a filling valve, an accumulator, a service brake valve, a parking brake valve, a front axle brake, and a rear axle brake; the dual oil pump includes a main oil pump and an auxiliary oil pump, the oil outlet of the hydraulic oil tank is connected to the oil inlet of the main oil pump, and the main oil pump is sequentially connected to the high-pressure oil filter and the filling valve; the filling valve is connected to the accumulator and the service brake valve respectively. The accumulator provides stable high-pressure oil to the braking system; the service brake valve is connected to the front axle brake and the rear axle brake respectively, providing brake hydraulic oil to the front axle brake and the rear axle brake; the oil inlet of the auxiliary oil pump is connected to the oil outlet of the hydraulic oil tank, and the oil outlet of the auxiliary oil pump is connected to port A of the front axle brake, providing cooling hydraulic oil to the front axle brake; the outlet B1 of the accumulator is connected to the inlet A1 of the parking brake valve, and port B of the parking brake valve is connected to the brake disc to realize the parking brake function.

[0007] Furthermore, pressure switches are connected to the filling valve, service brake valve, and parking brake valve to monitor the pressure of each valve in real time.

[0008] Furthermore, a pressure gauge is connected to the filling valve for real-time pressure monitoring.

[0009] Furthermore, a check valve is provided between the auxiliary oil pump and the front axle brake to prevent hydraulic oil backflow.

[0010] Furthermore, an overflow valve is provided between the main oil pump and the high-pressure oil filter for system overload protection.

[0011] Furthermore, an oil filter is provided between the hydraulic oil tank and the main oil pump to filter impurities in the hydraulic oil.

[0012] Furthermore, the front and rear axle brakes are multi-disc wet brakes to adapt to the working conditions of medium-sized mining trucks underground.

[0013] Compared with existing technologies, the beneficial effects of this utility model are as follows: I. Solving the problem of excessively high braking system pressure. This utility model adopts a dual-pump design. The main pump focuses on providing high-pressure oil to the braking system, in conjunction with a pressure regulation mechanism using a charging valve and accumulator. The accumulator can store stable high-pressure oil, and the charging valve can automatically replenish oil or overflow according to the system pressure, avoiding continuously excessive pressure. By precisely controlling the hydraulic oil pressure, the load and wear on system components caused by high pressure are reduced, making the braking process smoother, improving the stability of the braking effect, and extending the service life of each hydraulic component.

[0014] II. Preventing Hydraulic Oil and Transmission Oil Cross-contamination: This utility model features a main oil pump 1 and an auxiliary oil pump 2 that operate independently. The main oil pump 1 supplies oil to the braking system, while the auxiliary oil pump 2 specifically provides cooling hydraulic oil for the front axle brake 8. The two oil circuits are designed separately. This completely solves the problem of hydraulic oil and transmission oil cross-contamination in traditional systems, maintains stable hydraulic oil performance, avoids a decrease in braking efficiency due to oil mixing, and fundamentally improves the reliability of the braking system.

[0015] III. Extended Service Life and Adaptability to Downhole Conditions The front axle brake 8 and rear axle brake 9 of this utility model adopt multi-disc wet brakes, which are characterized by wear resistance and good heat dissipation, adapting to complex downhole conditions. Furthermore, a dual filtration design (oil filter and high-pressure oil filter) reduces hydraulic oil impurities and lowers component wear; an overflow valve prevents system overload, and a check valve prevents hydraulic oil backflow; these multiple protection mechanisms enhance system durability. The wear-resistant design of the brakes and the multiple protections of the system enable the braking system to maintain stable performance in high-load downhole environments, significantly extending the overall service life and reducing replacement costs due to component damage.

[0016] IV. Enhanced Maintenance Convenience: This utility model features pressure switches connected to the filling valve, service brake valve, and parking brake valve for real-time pressure monitoring. The filling valve is equipped with a pressure gauge for intuitive system pressure display. The oil circuit structure is clear, and the layout of each component facilitates maintenance; for example, the oil filter can be directly disassembled for cleaning or replacement, simplifying the maintenance process. Real-time pressure monitoring allows for rapid location of system faults (such as abnormal pressure or accumulator failure), reducing maintenance and troubleshooting time. The modular design makes component replacement more convenient, reducing maintenance difficulty and improving equipment operating efficiency.

[0017] V. Comprehensive Improvement of Safety and Reliability This utility model integrates a stable oil supply via an integrated accumulator, efficient braking with a multi-disc wet brake, and multiple pressure monitoring and safety protection features (overflow valve, check valve). This ensures the braking system provides reliable braking force during both service and parking braking, preventing brake failure due to pressure fluctuations or component malfunctions, significantly improving the operational safety of medium-sized mining trucks underground and reducing the risk of accidents. Attached Figure Description

[0018] Figure 1 This is a system block diagram of the present invention.

[0019] In the diagram: 1. Main oil pump; 2. Auxiliary oil pump; 3. High-pressure oil filter; 4. Filling valve; 5. Accumulator; 6. Service brake valve; 7. Parking brake valve; 8. Front axle brake; 9. Rear axle brake; 10. Hydraulic oil tank; 11. Oil filter; 12. Pressure switch; 13. Pressure gauge; 14. Relief valve; 15. Check valve; 16. Brake disc. Detailed Implementation

[0020] Please see Figure 1 This utility model discloses a braking system suitable for medium-sized mining trucks in underground mines, which mainly consists of a hydraulic oil tank 10, a dual oil pump, a high-pressure oil filter 3, a filling valve 4, an accumulator 5, a service brake valve 6, a parking brake valve 7, a brake, and safety and monitoring components.

[0021] Specifically, the hydraulic oil tank 10 serves as a hydraulic oil storage container and is connected to the oil inlets of the main oil pump 1 and the auxiliary oil pump 2 through its oil outlet. An oil filter 11 is installed between the main oil pump 1 and the auxiliary oil pump 2 to filter impurities in the hydraulic oil and ensure system cleanliness.

[0022] The dual oil pump system consists of a main oil pump 1 and an auxiliary oil pump 2. The main oil pump 1 is supplied with oil from the hydraulic oil tank 10, and its outlet is connected in sequence to the high-pressure oil filter 3 and the filling valve 4 to provide high-pressure oil for the braking system. The auxiliary oil pump 2 is also supplied with oil from the hydraulic oil tank 10, and its outlet is connected to port A of the front axle brake 8, specifically providing cooling hydraulic oil for the front axle brake 8.

[0023] The high-pressure oil filter 3 is installed between the main oil pump 1 and the filling valve 4 to further filter the hydraulic oil and prevent impurities from entering subsequent precision components.

[0024] The inlet of the filling valve 4 is connected to the high-pressure oil filter 3, and the outlet is connected to the accumulator 5 and the service brake valve 6, respectively. The filling valve 4 is connected to the pressure switch 12 and the pressure gauge 13 for real-time monitoring and display of system pressure.

[0025] Accumulator 5 is connected to charging valve 4 to store high-pressure oil and provide stable hydraulic power to the braking system. The outlet B1 of accumulator 5 is connected to the inlet A1 of parking brake valve 7 to provide hydraulic oil for the parking brake.

[0026] The service brake valve 6 is connected to the filling valve 4, receives high-pressure oil from the accumulator 5, and connects to the front axle brake 8 and the rear axle brake 9 through its outlet to achieve service braking. A pressure switch 12 is installed on the service brake valve 6 to monitor pressure changes during braking.

[0027] The inlet A1 of the parking brake valve 7 is connected to the outlet B1 of the accumulator 5, and the outlet B1 is connected to the brake disc 16 to control the opening and closing of the parking brake. The parking brake valve 7 is also equipped with a pressure switch 12 to monitor the pressure status during parking.

[0028] The brakes include a front axle brake 8 and a rear axle brake 9. The front axle brake 8 is connected to the service brake valve 6, receiving brake hydraulic oil, and simultaneously connected to the auxiliary oil pump 2 via port A, receiving cooling hydraulic oil. A one-way valve 15 is installed between the auxiliary oil pump 2 and the front axle brake 8 to prevent hydraulic oil backflow. The rear axle brake 9 is directly connected to the service brake valve 6, receiving brake hydraulic oil. Both the front axle brake 8 and the rear axle brake 9 are multi-disc wet brakes, suitable for complex downhole working conditions, and feature wear resistance and good heat dissipation.

[0029] Safety and monitoring components include an overflow valve 14, a check valve 15, a pressure switch 12, and a pressure gauge 13. The overflow valve 14 is installed between the main oil pump 1 and the high-pressure oil filter 3, opening when the system pressure exceeds a set value to prevent system overload. In addition to the check valve between the auxiliary oil pump 2 and the front axle brake 8, the check valve 15 also includes other check valves in the system (such as the accumulator circuit) to ensure unidirectional hydraulic oil flow. Pressure switches 12 are installed on the filling valve 4, service brake valve 6, and parking brake valve 7, respectively, to monitor the pressure of each valve in real time, triggering alarms or protection mechanisms when the pressure is abnormal. The pressure gauge 13 is installed on the filling valve 4, visually displaying the real-time pressure of the braking system for easy monitoring by operators.

[0030] Working principle of this utility model:

[0031] (I) Working principle of service brake (foot brake)

[0032] 1. The main hydraulic pump 1 draws hydraulic oil from the hydraulic oil tank 10, filters it through the oil filter 11, and outputs high-pressure oil to the high-pressure oil filter 3 for further filtration of impurities. The high-pressure oil enters the accumulator 5 for storage through the filling valve 4. At the same time, the filling valve 4 automatically adjusts according to the system pressure. When the pressure in the accumulator 5 is insufficient, it replenishes the oil supply; when the pressure is too high, it overflows back to the oil tank.

[0033] 2. Braking Execution: When the driver depresses the foot pedal, the service brake valve 6 opens, and the high-pressure oil in the accumulator 5 enters the front axle brake 8 and the rear axle brake 9 through the service brake valve 6. The high-pressure oil pushes the piston assembly inside the brake, causing the friction pads of the multi-disc wet brake to clamp the brake disc, generating braking force and achieving service braking.

[0034] 3. Pressure Monitoring and Protection: The pressure switch 12 on the service brake valve 6 monitors the brake pressure in real time to ensure braking effectiveness; the pressure gauge 13 on the filling valve 4 displays the system pressure synchronously, and the operator can promptly detect any abnormal pressure (such as excessively low pressure). The overflow valve 14 between the main oil pump 1 and the high-pressure oil filter 3 opens when the system pressure exceeds the safe value to prevent damage to components due to excessive pressure.

[0035] (II) Working principle of parking brake (handbrake)

[0036] 1. The outlet B1 of the hydraulic oil transmission accumulator 5 is connected to the inlet A1 of the parking brake valve 7. When the driver operates the parking brake valve 7, high-pressure oil enters the parking brake valve 7 from the accumulator 5.

[0037] 2. Parking Brake Execution: After the parking brake valve 7 is opened, high-pressure oil enters the brake disc 16 through port B, pushing the brake disc 16 to clamp the wheel, thus realizing the parking brake function. The pressure switch 12 on the parking brake valve 7 monitors the pressure during parking brake operation to ensure that the brake disc 16 remains clamped and prevents the vehicle from rolling away.

[0038] (III) Cooling System Working Principle The auxiliary oil pump 2 draws oil from the hydraulic oil tank 10 and outputs it to port A of the front axle brake 8, providing cooling hydraulic oil for the front axle brake 8. The cooling oil flows through the brake's interior, carrying away the heat generated during braking and preventing the brake from failing due to overheating. A one-way valve 15 is installed between the auxiliary oil pump 2 and the front axle brake 8 to ensure unidirectional flow of the cooling oil and prevent backflow from affecting the cooling effect.

[0039] (iv) System Safety and Monitoring Mechanism: Pressure switch 12 monitors the pressure of filling valve 4, service brake valve 6, and parking brake valve 7 in real time. When the pressure is lower than the set threshold, it can alert the driver through the vehicle alarm system to ensure reliable operation of the braking system. Pressure gauge 13 displays the system pressure visually, facilitating maintenance personnel to check the system status and promptly detect potential faults (such as insufficient accumulator pressure, abnormal oil pump, etc.). Oil filter 11 and high-pressure oil filter 3 provide dual filtration of hydraulic oil to prevent impurities from wearing hydraulic components and extend the system's service life.

[0040] (v) Improvements over traditional systems

[0041] The system employs a dual-pump design, with the main pump 1 dedicated to brake fluid supply and the auxiliary pump 2 independently providing cooling fluid, thus preventing hydraulic fluid from mixing with transmission fluid and improving braking performance.

[0042] Both the front axle brake 8 and the rear axle brake 9 adopt multi-disc wet brakes, which are suitable for downhole working conditions, have good heat dissipation and wear resistance, and, combined with the accumulator, provide stable high-pressure oil supply, solving the problem of unstable pressure in traditional systems.

[0043] Multiple pressure monitoring and safety protections (pressure switch, pressure gauge, relief valve, check valve) improve system reliability and safety and extend service life.

Claims

1. A braking system suitable for medium-sized mining trucks used underground, characterized in that, The system includes a hydraulic oil tank (10), a dual oil pump, a high-pressure oil filter (3), a filling valve (4), an accumulator (5), a service brake valve (6), a parking brake valve (7), a front axle brake (8), and a rear axle brake (9). The dual oil pump includes a main oil pump (1) and an auxiliary oil pump (2). The outlet of the hydraulic oil tank (10) is connected to the inlet of the main oil pump (1). The main oil pump (1) is connected in sequence to the high-pressure oil filter (3) and the filling valve (4). The filling valve (4) is connected to the accumulator (5) and the service brake valve (6). The accumulator (5) provides a stable hydraulic pressure for the braking system. The high-pressure oil is constant; the service brake valve (6) is connected to the front axle brake (8) and the rear axle brake (9) respectively, providing brake hydraulic oil to the front axle brake (8) and the rear axle brake; the oil inlet of the auxiliary oil pump (2) is connected to the oil outlet of the hydraulic oil tank (10), and the oil outlet of the auxiliary oil pump (2) is connected to the A port of the front axle brake (8), providing cooling hydraulic oil to the front axle brake (8); the outlet B1 of the accumulator (5) is connected to the inlet A1 of the parking brake valve (7), and the B port of the parking brake valve (7) is connected to the brake disc (16) to realize the parking brake function.

2. The braking system as described in claim 1, characterized in that, Pressure switches (12) are connected to the filling valve (4), service brake valve (6) and parking brake valve (7) to monitor the pressure of each valve in real time.

3. The braking system as described in claim 1, characterized in that, A pressure gauge (13) is connected to the filling valve (4) for real-time pressure detection.

4. The braking system as described in claim 2, characterized in that, A check valve (15) is provided between the auxiliary oil pump (2) and the front axle brake (8) to prevent hydraulic oil backflow.

5. The braking system as described in claim 3, characterized in that, An overflow valve (14) is provided between the main oil pump (1) and the high-pressure oil filter (3) for system overload protection.

6. The braking system as claimed in claim 1, characterized in that, An oil filter (11) is provided between the hydraulic oil tank (10) and the main oil pump (1) to filter impurities in the hydraulic oil.

7. The braking system as claimed in claim 1, characterized in that, The front axle brake (8) and rear axle brake (9) are multi-disc wet brakes to adapt to the working conditions of medium-sized mining trucks in the mine.

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