Full-hydraulic working and steering system of underground medium-sized mining truck

Abstract

The utility model relates to the technical field of hydraulic systems of underground trackless equipment, in particular to a full-hydraulic working and steering system of an underground medium-sized mining truck, which comprises a hydraulic oil tank, an oil suction filter, an oil pump, a flow amplifier, a steering gear, a steering cylinder, a main valve, a pilot oil supply valve, a pilot control valve, a lifting cylinder, an oil return valve block, an oil return filter and a hydraulic oil tank. The hydraulic oil tank is connected with the oil pump through the oil suction filter; hydraulic oil of the oil pump flows through a port HP of the flow amplifier and sequentially flows into a port P of the steering gear and a port P of the pilot oil supply valve through a port P of the flow amplifier. The system prevents element overload, reduces operating force, realizes accurate reversing, and improves steering reliability; pipelines are optimized, connection is simplified, the service life of elements is prolonged, and maintenance frequency is reduced; when a fault occurs, quick positioning is facilitated, troubleshooting difficulty is avoided, and convenient use, stable steering, efficient maintenance and whole vehicle safety are achieved.

Description

Technical Field

[0001] This utility model relates to the technical field of hydraulic systems for trackless underground equipment, specifically a fully hydraulic working and steering system for a medium-sized underground mining truck. Background Technology

[0002] Specialized underground rail transport vehicles are designed to adapt to the limited space in roadways, and include types such as freight cars, personnel cars, and material cars. Among them, mine cars, as narrow-gauge transport carriers for bulk materials (coal, ore, waste rock, etc.), need to be pulled by locomotives or winches. According to their structure and unloading methods, they are divided into five categories: fixed type (materials, flatbed cars), tipping type, single-sided curved rail side-discharge type, bottom (side) discharge type, and shuttle type mine cars, forming a systematic equipment system.

[0003] The working and steering system of trackless underground equipment is the most critical core component during the equipment's movement or turning process, and its performance directly affects the overall operating efficiency and safety of the equipment. However, traditional working and steering systems generally suffer from excessively high working and steering system pressure and complex piping layouts. These problems not only increase the difficulty of system maintenance but also make troubleshooting difficult when malfunctions occur, resulting in a significant decrease in steering performance and posing a serious threat to the safety of the entire vehicle. Utility Model Content

[0004] The purpose of this utility model is to provide a fully hydraulic working and steering system for underground medium-sized mining trucks, which solves the problems of excessive pressure and complicated pipeline layout that are common in traditional working and steering systems. This not only increases the difficulty of maintenance, but also makes it difficult to troubleshoot when a fault occurs, thereby greatly reducing steering performance and seriously threatening the safety of the entire vehicle.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a fully hydraulic working and steering system for a medium-sized underground mining truck, comprising a hydraulic oil tank, an oil pump, a flow amplifier, a steering gear, a steering cylinder, a main control valve, a pilot supply valve, a pilot control valve, a lifting cylinder, and a return valve block; the hydraulic oil tank is connected to the oil pump; the hydraulic oil output by the oil pump flows through the HP port of the flow amplifier, and then sequentially flows through the P port of the flow amplifier into the P port of the steering gear and the P port of the pilot supply valve; the EF port of the flow amplifier directs the hydraulic oil into the P port of the main control valve; the L, R, and LS ports of the steering gear cooperate with the L, R, and LS ports of the flow amplifier to control the steering of the steering cylinder; the pilot supply valve directs the hydraulic oil from the PV port into the pilot control valve, and the lifting or lowering of the lifting cylinder is achieved through the reversing mechanism of the main control valve; the return oil from the flow amplifier, steering gear, main control valve, pilot supply valve, and pilot control valve all flows back to the hydraulic oil tank through the return valve block.

[0006] Furthermore, the hydraulic oil tank is connected to a suction filter; the hydraulic oil tank and the oil pump are connected through the suction filter.

[0007] Furthermore, the outlet of the return oil valve block is connected to a return oil filter, and the return oil from the flow amplifier, the diverter, the main control valve, the pilot supply valve, and the pilot control valve all flows back to the hydraulic oil tank through the return oil valve block and the return oil filter.

[0008] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0009] 1. The working and steering system of this utility model solves the problems of excessive pressure and complex pipeline layout faced by traditional trackless equipment during working and steering. It adopts the HP port and EF port of the flow amplifier to distribute hydraulic oil in a coordinated manner, avoiding the problem of component overload caused by excessive system pressure. At the same time, through the low-pressure pilot control mechanism of the pilot oil supply valve and the pilot control valve, precise reversing is achieved while reducing the operating force, thereby improving the reliability of steering performance from the root. When the system malfunctions, the valve block design and oil circuit routing facilitate quick location of the problem, avoiding the troubleshooting difficulties caused by traditional complicated pipelines. Ultimately, it achieves the effects of convenient use, stable steering performance, convenient maintenance, and safe operation of the entire vehicle.

[0010] 2. In terms of pipeline layout, the return oil path of each component is integrated through the return oil valve block. Combined with the dual filtration design of suction oil filter and return oil filter, it not only simplifies pipeline connection and reduces complicated layout, but also extends the service life of hydraulic components and reduces maintenance frequency through oil circulation filtration. Attached Figure Description

[0011] Figure 1 This is a schematic diagram illustrating the working principle of the fully hydraulic working and steering system of the underground medium-sized mining truck of this utility model.

[0012] In the diagram: 1. Suction filter; 2. Oil pump; 3. Flow amplifier; 4. Steering gear; 5. Steering cylinder; 6. Main control valve; 7. Pilot supply valve; 8. Pilot control valve; 9. Return valve block; 10. Return filter; 11. Hydraulic oil tank; 12. Lifting cylinder. Detailed Implementation

[0013] Please see Figure 1A fully hydraulic working and steering system for a medium-sized underground mining truck includes a hydraulic oil tank 11, an oil pump 2, a flow amplifier 3, a steering gear 4, a steering cylinder 5, a main control valve 6, a pilot supply valve 7, a pilot control valve 8, a lifting cylinder 12, and a return valve block 9. The hydraulic oil output from the oil pump 2 flows through the HP port of the flow amplifier 3 and then sequentially flows through the P port of the flow amplifier 3 into the P port of the steering gear 4 and the P port of the pilot supply valve 7. This realizes the distribution and utilization of hydraulic oil, which not only ensures that the steering system can obtain stable and sufficient hydraulic power, but also improves the sensitivity and accuracy of steering.

[0014] The EF port (ExtraFlow port) of the flow amplifier 3 directs hydraulic oil into the P port of the main control valve 6; the EF port directly delivers hydraulic oil to the main control valve 6, forming an oil supply channel for the working system independent of the steering oil circuit, realizing dynamic balance of hydraulic power between the steering and lifting systems, avoiding pressure fluctuation problems during action switching in traditional single oil circuit systems, and improving system pressure stability.

[0015] The L, R, and LS ports of the steering gear 4 are coordinated with the L, R, and LS ports of the flow amplifier 3 to control the steering cylinder 5. The coordination between the L, R, and LS ports of the steering gear 4 and the L, R, and LS ports of the flow amplifier 3 can control the extension and retraction of the steering cylinder 5, thereby achieving the adjustment of the vehicle's steering.

[0016] The pilot supply valve 7 directs hydraulic oil from the PV (Pilot Valve) port into the pilot control valve 8, and through the switching mechanism of the main control valve 6, it raises or lowers the lifting cylinder 12. The hydraulic oil output from the PV port of the pilot supply valve 7 serves as the control oil source, driving the pilot control valve 8 in a low-pressure pilot mode to achieve the switching operation of the main control valve 6, thereby improving the ease of operation. When the pilot control valve 8 receives the operation command, it adjusts the flow direction of the control oil to push the valve core of the main control valve 6 to move, thereby achieving the directional supply of high-pressure oil to the lifting cylinder 12, thus completing the lifting or lowering action.

[0017] The hydraulic oil tank 11 is connected to a suction filter 1, which connects the hydraulic oil tank 11 to the oil pump 2. The suction filter 1 intercepts impurities and particles in the hydraulic oil, preventing them from entering the oil pump 2. This avoids wear, jamming, or even damage to the oil pump 2, extending its service life and reducing maintenance costs. Simultaneously, clean hydraulic oil entering the system reduces wear on hydraulic components, improves the overall operating efficiency and stability of the hydraulic system, and ensures that the equipment maintains efficient and safe operation even under complex working conditions.

[0018] The outlet of the return valve block 9 is connected to the return oil filter 10. The return oil from the flow amplifier 3, the diverter 4, the main control valve 6, the pilot supply valve 7, and the pilot control valve 8 all flows back to the hydraulic oil tank 11 through the return valve block 9 and the return oil filter 10. The return valve block 9 is used to collect multiple return oil flows and guide them to the return oil filter 10. The return oil filter 10 performs secondary purification on the return oil, intercepting impurities such as metal particles and colloidal deposits generated during the operation of the hydraulic system, thereby improving the cleanliness of the oil flowing back to the hydraulic oil tank 11.

[0019] Working process and principle: When the hydraulic oil in the hydraulic oil tank 11 is working, it is filtered by the suction filter 1 and then drawn in and pressurized by the oil pump 2. The pressurized hydraulic oil is output from the oil pump 2 and flows through the HP port of the flow amplifier 3. Then, it is split into two paths through its P port. One path flows into the P port of the steering gear 4 for steering control, and the other path flows into the P port of the pilot supply valve 7 to supply pressure to the pilot system. At the same time, the EF port of the flow amplifier 3 sends a portion of the hydraulic oil into the P port of the main control valve 6 as reserve pressure oil for the lifting system. When steering, the operator turns the steering gear 4, and its L, R, and LS ports are connected to the corresponding interfaces of the flow amplifier 3. In coordination, the hydraulic oil flow is controlled to the steering cylinder 5, pushing the piston to achieve steering. During lifting, the PV port of the pilot supply valve 7 sends pressurized oil to the pilot control valve 8, controlling the main control valve 6 to switch, and the hydraulic oil enters the rodless chamber of the lifting cylinder 12 to achieve lifting. When switching to the lowering position, the lifting cylinder 12 returns oil to complete the lowering. The return oil from the flow amplifier 3, steering gear 4, main control valve 6, pilot supply valve 7, and pilot control valve 8 is collected by the return oil valve block 9, filtered by the return oil filter 10, and flows back to the hydraulic oil tank 11, ensuring the cleanliness and recycling of the system's hydraulic oil, thereby ensuring the efficient and stable operation of the entire working and steering system. This system achieves coordinated and reliable operation of steering and lifting functions through flow distribution, pilot control, and dual filtration.

[0020] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A fully hydraulic working and steering system for a medium-sized underground mining truck, characterized in that, The system includes a hydraulic oil tank (11), an oil pump (2), a flow amplifier (3), a steering gear (4), a steering cylinder (5), a main control valve (6), a pilot supply valve (7), a pilot control valve (8), a lifting cylinder (12), and a return valve block (9). The hydraulic oil tank (11) is connected to the oil pump (2). The hydraulic oil output by the oil pump (2) flows through the HP port of the flow amplifier (3) and then through the P port of the flow amplifier (3) into the P port of the steering gear (4) and the P port of the pilot supply valve (7). The EF port of the flow amplifier (3) directs the hydraulic oil flow... The P port of the main control valve (6) is connected to the L, R and LS ports of the steering gear (4) and the L, R and LS ports of the flow amplifier (3) to control the steering cylinder (5) to turn; the pilot oil supply valve (7) directs the hydraulic oil from the PV port into the pilot control valve (8) and realizes the lifting or lowering of the lifting cylinder (12) through the reversing mechanism of the main control valve (6); the return oil from the flow amplifier (3), steering gear (4), main control valve (6), pilot oil supply valve (7) and pilot control valve (8) all flow back to the hydraulic oil tank (11) through the return oil valve block (9).

2. The working and steering system according to claim 1, characterized in that, The hydraulic oil tank (11) is connected to a suction filter (1); the hydraulic oil tank (11) and the oil pump (2) are connected through the suction filter (1).

3. The working and steering system according to claim 1, characterized in that, The outlet of the return valve block (9) is connected to the return oil filter (10). The return oil from the flow amplifier (3), the diverter (4), the main control valve (6), the pilot supply valve (7), and the pilot control valve (8) all flows back to the hydraulic oil tank (11) through the return oil filter (10) via the return oil block (9).

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