A hydraulic system suitable for a large-tonnage mine truck

Abstract

This utility model discloses a hydraulic system suitable for large-tonnage mining trucks in underground mines, relating to the field of hydraulic system technology. It includes a hydraulic oil tank for supplying oil to the hydraulic system; a first hydraulic circuit unit for controlling the lifting and lowering of the mining truck; a second hydraulic circuit unit for controlling the steering of the mining truck; a third hydraulic circuit unit for controlling the braking of the mining truck; and a fourth hydraulic circuit unit for controlling the cooling of the mining truck. The first, second, third, and fourth hydraulic circuit units are respectively connected to the hydraulic oil tank to form an oil supply circuit. This utility model can adapt to the high-load, frequent start-stop operating conditions in underground mines, reducing the frequency of failures.

Description

Technical Field

[0001] This utility model relates to the technical field of hydraulic systems for mining trucks, and specifically to a hydraulic system suitable for large-tonnage mining trucks used underground. Background Technology

[0002] In underground mining operations, heavy-duty mining trucks play a crucial role. However, the underground working environment is characterized by high loads and frequent start-stop cycles, which places extremely high demands on the performance of mining trucks, especially their hydraulic systems.

[0003] Traditional hydraulic systems for mining trucks have several shortcomings when dealing with complex underground working conditions. First, functional modules lack effective isolation; functions such as steering, lifting, braking, and cooling affect each other, and a failure in one module can impact others, reducing the stability and reliability of the entire hydraulic system. Second, energy distribution is not optimized, making it difficult to adapt to the high-load, frequent start-stop demands of underground operations, resulting in energy waste and increased operating costs. Furthermore, traditional hydraulic systems are poorly adaptable to the unique underground working environment, prone to failure, affecting the normal operation of mining trucks, and consequently impacting the efficiency and safety of underground operations.

[0004] For example, in the metallurgical furnace construction process, conventional steel tape measures cannot meet the requirements for measuring certain dimensions of joints, reflecting the limitations of related tools and equipment in special operating scenarios. Similarly, the hydraulic systems of heavy-duty mining trucks underground also need to be innovated and improved in design to adapt to the complex working environment and high-load operation requirements underground. Therefore, developing a hydraulic system suitable for heavy-duty mining trucks underground has significant practical implications. Utility Model Content

[0005] The purpose of this invention is to provide a hydraulic system suitable for large-tonnage mining trucks in underground mines, aiming to solve the problems of existing hydraulic systems in the background art being prone to failure and unable to meet the high-load working requirements in underground mines.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a hydraulic system suitable for large-tonnage mining trucks in underground mines, comprising a hydraulic oil tank for supplying oil to the hydraulic system; a first oil circuit unit for controlling the lifting and lowering of the mining truck; a second oil circuit unit for controlling the steering of the mining truck; a third oil circuit unit for controlling the braking of the mining truck; and a fourth oil circuit unit for controlling the cooling of the mining truck; the first, second, third, and fourth oil circuit units are respectively connected to the hydraulic oil tank to form an oil supply circuit.

[0007] Furthermore, the first oil circuit unit includes a first oil pump, a flow amplifier, a steering gear, a steering valve, a steering safety valve, and a steering cylinder connected in sequence to complete the steering function control of the mining truck. The first oil pump is connected to the hydraulic oil tank, the outlet of the steering valve is connected to the return valve block, the steering cylinder includes a left steering cylinder and a right steering cylinder, the steering valve is used to control the left steering cylinder and the right steering cylinder, and the steering safety valve is used for oil circuit pressure limiting and stabilization.

[0008] Furthermore, the second oil circuit unit includes a main valve and a lifting cylinder connected to the main valve. The hydraulic oil flowing out of the EF port of the flow amplifier enters the main valve and the lifting cylinder in sequence, and finally flows back to the hydraulic oil tank through the T port of the main valve and the HT port of the flow amplifier, and through the return oil filter, thus completing the lifting or lowering function control of the mining truck.

[0009] Furthermore, the third oil circuit unit includes a second oil pump, a check valve, an oil filter, a filling valve, an accumulator, a reversing valve, a shuttle valve, and a foot brake valve. The second oil pump, the check valve, and the oil filter are connected in sequence. The oil flows through the second oil pump, the check valve, and the oil filter in sequence into the P port of the filling valve, then through the A port of the filling valve into the P port of the accumulator, and then flows through the reversing valve, the shuttle valve, and the foot brake valve in sequence into the front axle and the rear axle, thus completing the braking function control of the mining truck.

[0010] Furthermore, the fourth oil circuit unit includes a first oil branch circuit and a second oil branch circuit. The first oil branch circuit includes a second oil pump, a check valve, and a hydraulic motor for driving the radiator, which are connected in sequence. The second oil branch circuit includes a cooling safety valve, a radiator, a first-stage flow divider valve, and a second-stage flow divider valve. The hydraulic oil flowing out of the O port of the filling valve passes through the A port of the cooling safety valve, the radiator, the first-stage flow divider valve, and the second-stage flow divider valve in sequence. The first-stage flow divider valve and the second-stage flow divider valve are used to guide the oil into the brake cylinders of the front axle and the rear axle to cool the front axle and the rear axle.

[0011] This utility model has the following beneficial effects:

[0012] This utility model provides a hydraulic system suitable for large-tonnage mining trucks in underground mines. It adopts a modular design and is divided into four functional modules: steering, lifting, braking, and cooling. The functions are isolated through independent oil circuits, while sharing a hydraulic oil tank, a first oil pump, and a second oil pump. The system optimizes energy distribution through key components such as flow amplifiers and accumulators to adapt to the high-load and frequent start-stop working conditions in underground mines. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] In the diagram: 1. Hydraulic oil tank; 2. First oil pump; 3. Second oil pump; 4. Flow amplifier; 5. Steering gear; 6. Steering valve; 7. Steering safety valve; 8. Main valve; 9. Lifting cylinder; 10. Steering cylinder; 11. Return oil filter; 12. Check valve; 13. Oil filter; 14. Filling valve; 15. Accumulator; 16. Directional valve; 17. Shuttle valve; 18. Foot brake valve; 19. Front axle; 20. Rear axle; 21. Radiator; 22. Hydraulic motor; 23. Cooling safety valve; 24. First-stage flow divider valve; 25. Second-stage flow divider valve. Detailed Implementation

[0015] like Figure 1 As shown, a hydraulic system suitable for large-tonnage mining trucks in underground mines is characterized by comprising a hydraulic oil tank 1 for supplying oil to the hydraulic system; a first hydraulic circuit unit for controlling the lifting and lowering of the mining truck; a second hydraulic circuit unit for controlling the steering of the mining truck; a third hydraulic circuit unit for controlling the braking of the mining truck; and a fourth hydraulic circuit unit for controlling the cooling of the mining truck. The first, second, third, and fourth hydraulic circuit units are respectively connected to the hydraulic oil tank to form an oil supply circuit.

[0016] The first hydraulic circuit unit includes a first oil pump 2, a flow amplifier 4, a steering gear 5, a steering valve 6, a steering safety valve 7, and a steering cylinder 10 connected in sequence. It completes the steering function control of the mining truck. The first oil pump 2 is connected to the hydraulic oil tank 1. The outlet of the steering valve 6 is connected to the return valve block. The steering cylinder 10 includes a left steering cylinder and a right steering cylinder. The steering valve 6 is used to control the left steering cylinder and the right steering cylinder. The steering safety valve 7 is used for oil circuit pressure limiting and stabilization. The steering safety valve 7 is connected to the left steering cylinder and the right steering cylinder respectively. The steering valve 6 is used to control the start and stop of the steering cylinder 10, and also to control the hydraulic oil flow direction, thereby controlling the truck to complete the steering. The steering safety valve 7 is a superimposed double relief valve, used for oil circuit pressure limiting and stabilization, preventing overpressure damage to components, and helping to stabilize steering performance.

[0017] The second hydraulic circuit unit includes a main valve 8 and a lifting cylinder 9 connected to the main valve 8. The hydraulic oil flowing out of the EF port of the flow amplifier 4 enters the main valve 8 and the lifting cylinder 9 in sequence, and finally flows back to the hydraulic oil tank 1 through the T port of the main valve 8 and the HT port of the flow amplifier 4, and through the return oil filter 11, thus completing the lifting or lowering function control of the mining truck. The main valve 8 is used to drive the loader to perform lifting and lowering actions.

[0018] The third hydraulic circuit unit includes a second oil pump 3, a check valve 12, an oil filter 13, a filling valve 14, an accumulator 15, a reversing valve 16, a shuttle valve 17, and a foot brake valve 18. The second oil pump 3, the check valve 12, and the oil filter 13 are connected in sequence. The oil flows through the second oil pump 3, the check valve 12, and the oil filter 13 into the P port of the filling valve 14, then through the A port of the filling valve 14 into the P port of the accumulator 15, and then flows through the reversing valve 16, the shuttle valve 17, and the foot brake valve 18 in sequence into the front axle 19 and the rear axle 20, thus completing the braking function control of the mining truck. The oil filter 13 is used to filter impurities in the oil, the filling valve 14 is used for rapid oil replenishment or drainage, the accumulator 15 is used for pressure maintenance and replenishment, the reversing valve 16 is used to control the on / off of the third hydraulic circuit unit, the shuttle valve 17 is used to ensure consistent pressure between the front and rear axles, and the foot brake valve 18 controls the distribution of braking pressure to the front and rear axles.

[0019] The fourth oil circuit unit includes a first oil branch circuit and a second oil branch circuit. The first oil branch circuit is used to drive the radiator. The first oil branch circuit includes a second oil pump 3, a one-way valve 12, and a hydraulic motor 22 for driving the radiator 21, which are connected in sequence. The second oil branch circuit includes a cooling safety valve 23, a radiator 21, a first-stage flow divider valve 24, and a second-stage flow divider valve 25. The hydraulic oil flowing out of the filling valve 140 port passes through the A port of the cooling safety valve 23, the radiator 21, the first-stage flow divider valve 24, and the second-stage flow divider valve 25 in sequence. The first-stage flow divider valve 24 and the second-stage flow divider valve 25 are used to guide the oil into the brake cylinders of the front axle and the rear axle to cool the front axle and the rear axle. The brake cylinders of the front axle and the rear axle are connected to return valves.

[0020] The specific operation process of this utility model is as follows:

[0021] When the steering system is working, the first oil pump 2 draws oil from the hydraulic oil tank 1 and delivers the hydraulic oil to the flow amplifier 4. The oil then passes through the steering gear 5 and the steering valve 6. The steering valve 6 controls the movement of the left and right steering cylinders, thereby achieving steering of the mining truck. The steering safety valve 7 is used to limit and stabilize the pressure in the oil circuit, ensuring the safe and stable operation of the system. The outlet of the steering valve 6 is connected to the return valve block, allowing the hydraulic oil to flow back to the corresponding circuit.

[0022] During lifting, the hydraulic oil flowing from the EF port of the flow amplifier 4 sequentially enters the main valve 8 and the lifting cylinder 9, driving the lifting cylinder 9 to achieve the lifting or lowering action of the mining truck. Finally, the hydraulic oil flows back to the hydraulic oil tank through the T port of the main valve 8 and the HT port of the flow amplifier, and then through the return oil filter.

[0023] When the directional valve disconnects the third hydraulic circuit unit, the truck is in manual parking mode. When the third hydraulic circuit unit is connected and the foot brake valve 18 is not activated, the third oil pump delivers oil through the check valve 12 and the oil filter 13 to the P port of the filling valve 14 for rapid filling. The oil then flows through the A port of the filling valve 14 into the P port of the accumulator 15 for energy storage. Afterward, the hydraulic oil flows sequentially through the directional valve 16, the shuttle valve 17, and the foot brake valve 18 before entering the brake cylinders of the front axle 19 and the rear axle 20. Under pressure, the baffles open, and the oil flows back to the hydraulic oil tank through the return valve. When the third hydraulic circuit unit is connected and the foot brake valve 18 is activated, the first outlet of the foot brake valve 18 closes, and the second outlet opens. The oil flows through the second outlet into the return valve. At the same time, since there is no continuous oil inflow, the baffles inside the front and rear axle brake cylinders close, and the brake cylinders brake the front axle 19 and the rear axle 20, thus braking the truck.

[0024] During cooling, the hydraulic oil output by the second oil pump 3 drives the hydraulic motor 22 through the check valve 12, causing the radiator 21 to operate; the hydraulic oil flowing out of the O port of the filling valve 14 passes sequentially through the A port of the cooling safety valve 23, the radiator 21, the first-stage diverter valve 24, and the second-stage diverter valve 25; the first-stage diverter valve 24 and the second-stage diverter valve 25 guide the oil into the brake cylinders of the front axle and the rear axle, and the oil mixes with the oil in the brake cylinders, thereby achieving the cooling of the front axle 19 and the rear axle 20.

Claims

1. A hydraulic system suitable for large-tonnage mining trucks underground, characterized in that, The system includes a hydraulic tank (1), a first hydraulic circuit unit for controlling the steering of the mining truck, a second hydraulic circuit unit for controlling the lifting and lowering of the mining truck, a third hydraulic circuit unit for controlling the braking of the mining truck, and a fourth hydraulic circuit unit for controlling the cooling of the mining truck. The first, second, third, and fourth hydraulic circuit units are connected to the hydraulic tank (1). The third hydraulic circuit unit includes a second oil pump (3), a check valve (12), an oil filter (13), a filling valve (14), an accumulator (15), a reversing valve (16), a shuttle valve (17), a foot brake valve (18), a front axle (19), and a rear axle (20). The second oil pump (3), the check valve (12), and the oil filter (13) are connected in sequence. The oil flows through the second oil pump (3), the check valve (12), and the oil filter (13) into the P port of the filling valve (14), and then flows into the accumulator through the A port of the filling valve (14). The oil flows through the P port of the device (15), then through the reversing valve (16), shuttle valve (17), foot brake valve (18) and into the front axle (19) and rear axle (20). The fourth oil circuit unit includes a first oil circuit and a second oil circuit. The first oil circuit includes a second oil pump (3), a check valve (12) and a hydraulic motor (22) for driving the radiator (21) to run, which are connected in sequence. The second oil circuit includes a cooling safety valve (23), radiator (21), first-stage diverter valve (24) and second-stage diverter valve (25). The hydraulic oil flowing out of the O port of the filling valve (14) passes through the A port of the cooling safety valve (23), radiator (21), first-stage diverter valve (24) and second-stage diverter valve (25) in sequence. The first-stage diverter valve (24) and second-stage diverter valve (25) are used to guide the oil into the brake cylinders of the front axle (19) and rear axle (20) to cool the front axle (19) and rear axle (20).

2. The hydraulic system according to claim 1, characterized in that, The first oil circuit unit includes a first oil pump (2), a flow amplifier (4), a steering gear (5), a steering valve (6), a steering safety valve (7), and a steering cylinder (10) connected in sequence. The first oil pump (2) is connected to the hydraulic oil tank (1). The outlet of the steering valve (6) is connected to the return valve block. The steering cylinder (10) includes a left steering cylinder and a right steering cylinder.

3. The hydraulic system according to claim 2, characterized in that, The second oil circuit unit includes a main valve (8) and a lifting cylinder (9) connected to the main valve (8). The hydraulic oil flowing out of the EF port of the flow amplifier (4) enters the main valve (8) and the lifting cylinder (9) in sequence, and finally flows back to the hydraulic oil tank (1) through the T port of the main valve (8) and the HT port of the flow amplifier (4) and the return oil filter (11).

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