Lifting control valve group, lifting control system of mine dump truck and mine dump truck

Abstract

The utility model relates to a kind of lifting control valve group of mine dump truck, lifting control system and mine dump truck, including lifting main valve, shunt block, balance valve and lifting control valve;Wherein, the lifting control valve is electrically connected with the lifting main valve, the lifting control valve is used to control the hydraulic oil output flow of the lifting main valve;The balance valve is set on the oil outlet pipeline of the lifting main valve, and the balance valve is used to balance the impact load in lifting process;The shunt block is set on the oil return pipeline of the lifting main valve, and the shunt block is used to integrate complex pipeline. Two-stage regulation is realized by lifting control valve and lifting main valve, and smaller control power is used to control high-power lifting working condition, so as to reduce the control cost of large flow, and thus stepless regulation of lifting speed is realized.

Description

Technical Field

[0001] This utility model relates to the technical field of mining dump trucks, and in particular to a lifting control valve group, a lifting control system, and a mining dump truck. Background Technology

[0002] Mining dump trucks are used for ore extraction and transportation in mines. They transport unprocessed ore loaded in cargo boxes to fixed crushing points and other locations, where the ore is dumped through the lifting and lowering of the cargo box, completing the production process. Traditional mining dump truck lifting systems mostly use manual on / off valves or ordinary solenoid valves for control. The lifting speed is not adjustable, and the stopping position accuracy is not high, resulting in a high material spillage rate. Therefore, this paper proposes a lifting control valve group, a lifting control system, and a mining dump truck. Utility Model Content

[0003] This utility model provides a lifting control valve group, a lifting control system, and a mining dump truck, to solve at least one of the above-mentioned technical problems.

[0004] This utility model provides a lifting control valve group for a mining dump truck, including a lifting main valve, a flow divider, a balance valve, and a lifting control valve; The lifting control valve is electrically connected to the lifting main valve, and the lifting control valve is used to control the hydraulic oil output flow of the lifting main valve. The balance valve is installed on the oil outlet line of the lifting main valve, and the balance valve is used to balance the impact load during the lifting process. The flow divider is installed on the return oil line of the lifting main valve, and the flow divider is used to integrate complex pipelines.

[0005] In one embodiment, a bypass valve is also included, which is connected to the lifting main valve. The bypass valve is used to merge all return oil and facilitates access to the bypass hydraulic oil cooling system.

[0006] In one embodiment, the system further includes a valve assembly bracket on which the lifting main valve, the flow divider, the bypass flow divider, the balance valve, and the lifting control valve are all mounted.

[0007] In one embodiment, the lifting main valve is a four-piece assembly.

[0008] A lifting control system for a mining dump truck includes a lifting control valve group and a hydraulic pump group, wherein the hydraulic pump group is connected to the lifting main valve.

[0009] In one embodiment, a plurality of hydraulic oil tanks are included, the plurality of hydraulic oil tanks being connected to a bypass diverter valve, the hydraulic oil tanks being used to recover hydraulic oil.

[0010] In one embodiment, the system further includes a plurality of lifting cylinders, each of which has an oil inlet connected to the balance valve and an oil outlet connected to the diverter block.

[0011] In one embodiment, the system also includes a frame on which the lifting control valve assembly, the plurality of hydraulic tanks, the hydraulic pump assembly, and the plurality of lifting cylinders are mounted.

[0012] In one embodiment, a control system is also included, which is electrically connected to the lifting control valve and the hydraulic pump assembly, respectively.

[0013] A mining dump truck, including a lifting control system for the mining dump truck.

[0014] Compared with the prior art, the advantages of this utility model are that it achieves two-stage regulation through the lifting control valve and the lifting main valve, uses a smaller control power to control the high-power lifting condition, thereby reducing the cost of high-flow control and thus realizing stepless regulation of the lifting speed. Attached Figure Description

[0015] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0016] Figure 1 This is an overall schematic diagram of the lifting control valve assembly of this utility model; Figure 2 yes Figure 1 Exploded view; Figure 3 This is a schematic diagram of the lifting control valve assembly of this utility model; Figure 4 This is a schematic diagram of the lifting control system of this utility model; Figure label: 1. Lifting control valve assembly; 11. Lifting main valve; 12. Valve assembly bracket; 13. Bypass diverter valve; 14. Diverter block; 15. Balance valve; 16. Lifting control valve; 2. Lifting cylinder; 3. Chassis; 4. Hydraulic pump assembly; 5. Hydraulic oil tank. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] Existing lifting control valve assemblies in mining dump trucks rely on the driver's experience, which cannot meet the fully automated operation requirements of unmanned mining dump trucks, such as automatic addressing lifting and precise unloading. Furthermore, traditional methods suffer from significant hydraulic shock during valve core reversal in the main lifting valve, reducing the lifespan of the cylinders and chassis, especially during heavy-duty lifting. Existing direct proportional valve control schemes are costly, energy-intensive, and slow to respond at high flow rates, making them unsuitable for large-tonnage mining dump trucks. Additionally, open-loop control cannot compensate for lifting position deviations caused by load changes in real time. This utility model aims to provide a high-precision, anti-interference, and low-impact unmanned mining dump truck with a cargo box lifting control valve group, a lifting control system, and a mining dump truck equipped with the lifting control system. This enables fully automatic closed-loop control of cargo box lifting and lowering in unmanned driving mode. The cost of high-flow control is reduced by using a pilot proportional control valve + lifting main valve for two-stage regulation. A ramp flow control algorithm is used to eliminate hydraulic shock. The structural optimization of the valve core of the lifting control valve group can improve its anti-pollution capability under harsh mining conditions.

[0019] Please refer to Figure 1 and Figure 2 A lifting control valve assembly for a mining dump truck includes a lifting main valve 11, a flow divider 14, a balance valve 15, and a lifting control valve 16. The lifting control valve 16 is electrically connected to the lifting main valve 11 and controls the hydraulic oil output flow of the lifting main valve 11. The balance valve 15 is located on the oil outlet line of the lifting main valve 11 and is used to balance the impact load during the lifting process, improving the operational stability of the lifting control valve assembly 16. The flow divider 14 is located on the oil return line of the lifting main valve 11 and is used to integrate complex pipelines.

[0020] To better implement this utility model, refer to Figure 2 In one embodiment, the lifting control valve group 16 further includes a bypass diverter valve 13. The lifting main valve 11 is connected to the bypass diverter valve 13. The bypass diverter valve 13 is used to merge all return oil and provides a bypass cooling interface for easy access to a bypass hydraulic oil cooling system, such as... Figure 3 As shown in the figure, the E1 port on the left side of the bypass valve 13 is connected to the rear brake cooling port, and the E2 port is connected to the rear brake cooling return port; the F1 port on the right side of the bypass valve 13 is connected to the front brake cooling port, and the F2 port is connected to the front brake cooling return port.

[0021] To better implement this utility model, refer to Figure 1 and Figure 2In one embodiment, the lifting control valve 16 assembly further includes a valve assembly bracket 12, on which the lifting main valve 11, flow divider 14, bypass flow divider valve 13, balance valve 15, and lifting control valve 16 are all mounted. In this embodiment, the lifting main valve 11 is preferably a four-piece assembly, and the valve assembly bracket 12 uses customized steel structural components to fix the various components.

[0022] A lifting control system for a mining dump truck includes 16 lifting control valves, a hydraulic pump assembly 4, multiple hydraulic oil tanks 5, multiple lifting cylinders 2, and a chassis 3. The hydraulic pump assembly 4 is connected to a lifting main valve 11. Figure 3 As shown, hydraulic pump unit 4 is connected at points P1 and P2; multiple hydraulic oil tanks 5 are connected to bypass diverter valve 13, as shown. Figure 3 As shown, T1 and T2 are connected to hydraulic oil tank 5, which is used to recover hydraulic oil; the oil inlet of each lifting cylinder 2 is connected to the balance valve 15, and the oil outlet of each lifting cylinder 2 is connected to the diverter block 14; the lifting control valve 16 group, multiple hydraulic oil tanks 5, hydraulic pump group 4 and multiple lifting cylinders 2 are all mounted on the frame 3.

[0023] Specifically, in this embodiment, there are two sets of lifting cylinders 2, respectively located on both sides of the frame 3. The lifting main valve 11 is a power stage valve group that provides lifting power to the lifting cylinders 2. The oil outlet of the lifting main valve 11 is connected to the balance valve 15. The balance valve 15 sends hydraulic oil to the two lifting cylinders 2 through the oil circuit. The balance valve 15 is connected to the oil inlets A1 and A2 of the two lifting cylinders 2 respectively. During the lifting process, the hydraulic oil enters the lifting cylinders 2. The hydraulic oil in the entire lifting control system needs to be circulated. At this time, the hydraulic oil in the two lifting cylinders 2 will flow from the oil outlets B1 and B2 to the flow divider block 14, and return to the lifting main valve 11 from the oil return port of the lifting main valve 11 through the oil circuit between the flow divider block 14 and the lifting main valve 11. The flow divider block 14 is used to integrate complex pipelines and improve integration.

[0024] To better implement this utility model, in one embodiment, the lifting control system further includes a control system, which is electrically connected to the lifting control valve 16 and the hydraulic pump group 4 respectively. The control system is used to control the operation of the lifting control valve 16 and the hydraulic pump group 4. The lifting control valve 16 introduces the pressure of the control hydraulic circuit to supply two pilot proportional control valves in the lifting control valve 16, so that the lifting control valve 16 can transmit proportional electrical signals to the lifting main valve 11. Through these two pilot proportional control valves, the displacement of the valve core of the lifting main valve 11 can be accurately controlled, thereby accurately controlling the output flow of the lifting main valve 11. In the whole process, the hydraulic oil of the lifting main valve 11 comes from the hydraulic pump group 4. The performance of the lifting control valve 16 directly determines the performance of the entire lifting control system. Therefore, in this embodiment, the lifting control valve 16 is preferably a valve with high frequency response, linearity and high load-bearing accuracy.

[0025] The lifting control system in this invention requires no additional valves. In wired mode, the input current of the pilot proportional control valve is controlled by commands, allowing the control mode to be in lifting, holding, forced descent, or floating positions, thus achieving unmanned cargo box lifting. The lifting control system has built-in wired control functionality. During actual operation, signals are sent from the control system, which compares these feedback signals with set values ​​to calculate the required pressure or flow rate for each hydraulic interface. This allows for real-time monitoring of the cable deployment and retraction status, and precise control of the mechanism to ensure stable system operation.

[0026] A mining dump truck, including a lifting control system for the mining dump truck.

[0027] The lifting control system of this invention can achieve stepless speed regulation of lifting speed, high stopping position accuracy, and avoid excessive material spillage. This lifting control system does not rely on driver experience and can meet the fully automatic operation requirements of unmanned mining dump trucks. It can effectively avoid hydraulic shock during the valve core switching process of the 16th lifting control valve group. Using a pilot stage for control, it can control high-power lifting conditions with relatively small control power, and facilitate real-time compensation and position accumulation deviation of open-loop control.

[0028] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A lift control valve group of a mining dump truck, characterized in that, Includes the main lifting valve, flow divider, balance valve, and lifting control valve; The lifting control valve is electrically connected to the lifting main valve, and the lifting control valve is used to control the hydraulic oil output flow of the lifting main valve. The balance valve is installed on the oil outlet line of the lifting main valve, and the balance valve is used to balance the impact load during the lifting process. The flow divider is installed on the return oil line of the lifting main valve, and the flow divider is used to integrate complex pipelines.

2. The lifting control valve assembly for a mining dump truck according to claim 1, characterized in that, It also includes a bypass valve, which is connected to the lifting main valve. The bypass valve is used to combine all return oil and facilitates the connection of the bypass hydraulic oil cooling system.

3. The lift control valve group of a mining dump truck according to claim 2, characterized in that, It also includes a valve assembly bracket, on which the lifting main valve, the flow divider, the bypass flow divider valve, and the balance valve and the lifting control valve are all mounted.

4. The lift control valve group of a mining dump truck according to claim 3, characterized in that, The lifting main valve is a four-piece assembly.

5. A lift control system for a mining dump truck comprising a lift control valve group according to any one of claims 1-4, characterized in that, It also includes a hydraulic pump unit, which is connected to the lifting main valve.

6. The lift control system of a mining dump truck according to claim 5, characterized in that, It includes multiple hydraulic oil tanks, which are connected to a bypass valve, and the hydraulic oil tanks are used to recover hydraulic oil.

7. The lift control system of a mining dump truck according to claim 6, characterized in that, It also includes multiple lifting cylinders, each of which has an oil inlet connected to the balance valve and an oil outlet connected to the diverter block.

8. The lifting control system for the mining dump truck according to claim 7, characterized in that, It also includes a chassis, on which the lifting control valve assembly, the plurality of hydraulic oil tanks, the hydraulic pump assembly and the plurality of lifting cylinders are all mounted.

9. The lift control system of a mining dump truck according to claim 8, characterized in that, It also includes a control system, which is electrically connected to the lifting control valve and the hydraulic pump unit, respectively.

10. A mining dump truck characterized in that, The lifting control system of the mining dump truck as described in any one of claims 5-9.

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