Hydraulic lifting control system of pneumoelectric control type wide-body dumper for mine

Abstract

The utility model discloses a hydraulic lifting control system of a pneumoelectric control type wide-body dumper for a mine. Comprising a lifting cylinder, a travel switch used for detecting the position state of the lifting cylinder, a hydraulic oil tank, a lifting pump, a power takeoff used for driving the lifting pump, an air control hydraulic lifting valve used for switching the hydraulic flowing direction, a manual lifting valve used for manually controlling the air control hydraulic lifting valve and a manual power takeoff valve connected with the manual lifting valve. The pneumatic control limiting valve is used for controlling the lifting cylinder, the electromagnetic valve DT6 is used for switching the pneumatic control hydraulic lifting valve to a descending position, the electromagnetic valve DT7 is used for switching the pneumatic control hydraulic lifting valve to a lifting position, and the electromagnetic valve DT8 is used for controlling the power takeoff. Hydraulic oil pumped out by the lifting pump controls the lifting cylinder to ascend and descend through the pneumatic control hydraulic lifting valve. The number of valves is reduced, and pipeline arrangement is optimized.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic systems, in particular to a gas-electric controlled hydraulic lifting control system for a wide-body mining dump truck. Background Art

[0002] At present, domestic mines are in a period of vigorous development, and various mining machinery are also flourishing. Wide-body dump trucks are favored by major mines due to their advantages of light weight and heavy load. However, due to the harsh working environment and high labor intensity in mines, it is becoming increasingly difficult to recruit wide-body truck drivers. Therefore, unmanned driving has become a development trend of mining vehicles.

[0003] At present, the control of the hydraulic lifting system of unmanned wide-body dump trucks adopts the control method of shuttle valve plus two-position three-way solenoid valve. The disadvantages of the existing technology are: a. The shuttle valve is easy to get stuck, causing system failure; b. The number of valves is large, making the system pipeline complex; c. The increase in the number of valves will increase the purchase cost and maintenance cost of the system. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a gas-electric controlled wide-body mining dump truck hydraulic lifting control system, which reduces the number of valves and optimizes the pipeline layout.

[0005] In order to solve the above technical problems, the technical solution of the utility model is: a gas-electrically controlled hydraulic lifting control system for a wide-body mining dump truck, including a lifting cylinder, a travel switch for detecting the position state of the lifting cylinder, a hydraulic oil tank, a lifting pump, a power take-off for driving the lifting pump, an air-controlled hydraulic lifting valve for switching the hydraulic flow direction, a manual lifting valve for manually controlling the air-controlled hydraulic lifting valve, a manual power take-off valve connected to the manual lifting valve, an air-controlled limit valve for controlling the lifting cylinder, a solenoid valve DT6 for switching the air-controlled hydraulic lifting valve to a descending position, a solenoid valve DT7 for switching the air-controlled hydraulic lifting valve to a lifting position, and a solenoid valve DT8 for controlling the power take-off; the hydraulic oil pumped out by the lifting pump controls the lifting of the lifting cylinder through the air-controlled hydraulic lifting valve. Principle of the utility model: the hydraulic oil tank is used to store hydraulic oil, the power take-off provides mechanical power for the lifting pump, and the lifting pump pumps out high-pressure hydraulic oil to push the lifting cylinder to move; the air-controlled hydraulic lifting valve switches the flow direction of the hydraulic oil to realize the lifting, middle stop and lowering actions of the lifting cylinder; the travel switch detects the position state of the lifting cylinder; the air-controlled limit valve automatically switches the air-controlled limit valve to the middle stop position after the lifting is in place, saving energy; the manual lifting valve manually controls the switching of the air-controlled hydraulic lifting valve; the solenoid valve DT7 can control the valve through an electrical signal to control the switching of the air-controlled hydraulic lifting valve; the solenoid valve DT8 can control the valve through an electrical signal to control the on and off of the power take-off.

[0006] As an improvement, the solenoid valve DT7 is a two-position three-way pneumatic solenoid valve.

[0007] As an improvement, the P port of the solenoid valve DT6 is connected to the air source, the R port is connected to the descending air port of the manual lifting valve, and the A port is connected to the descending control end of the air-controlled hydraulic lifting valve.

[0008] As an improvement, the P port of the solenoid valve DT7 is connected to the air source, the R port is connected to the lifting air port of the manual lifting valve, the A port is connected to the air inlet of the air-controlled limit valve, and the air outlet of the air-controlled limit valve is connected to the lifting control end of the air-controlled hydraulic lifting valve.

[0009] As an improvement, the P port of the solenoid valve DT8 is connected to the air source, the A port is connected to the air inlet of the power take-off, and the R port is connected to the air outlet of the manual power take-off valve.

[0010] Compared with the prior art, the utility model has the following beneficial effects:

[0011] 1. Control the hydraulic lifting system with electrical signals to facilitate unmanned driving;

[0012] 2. During the lifting process, the travel switch will feedback its status and provide parameters for electrical control;

[0013] 3. By realizing unmanned driving, the driver's labor intensity can be reduced, management costs can be saved for mines, and the occurrence of safety accidents can be reduced or even avoided;

[0014] 4. The improved hydraulic lifting system has very few additional and modified parts, which greatly saves the manufacturing cost of the vehicle;

[0015] 5. The operating habits of manual driving will not be changed at all, and manual driving can be quickly intervened when the unmanned driving system fails;

[0016] 6. The system eliminates the shuttle valve, which can effectively reduce the failure rate of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the hydraulic pipeline diagram of the utility model. DETAILED DESCRIPTION

[0018] The utility model will be further described below in conjunction with the accompanying drawings.

[0019] like Figure 1As shown, a gas-electrically controlled hydraulic lifting control system for a wide-body mining dump truck includes a lifting cylinder 5, a travel switch 4 for detecting the position state of the lifting cylinder 5, a hydraulic oil tank, a lifting pump 1, a power take-off 2 for driving the lifting pump 1, an air-controlled hydraulic lifting valve 3 for switching the hydraulic flow direction, a manual lifting valve 7 for manually controlling the air-controlled hydraulic lifting valve 3, a manual power take-off valve 8 connected to the manual lifting valve 7, an air-controlled limit valve 6 for controlling the lifting cylinder 5, a solenoid valve DT6 for switching the air-controlled hydraulic lifting valve 3 to a descending position, a solenoid valve DT7 for switching the air-controlled hydraulic lifting valve 3 to a lifting position, and a solenoid valve DT8 for controlling the power take-off 2. The hydraulic oil pumped out by the lifting pump 1 controls the lifting of the lifting cylinder 5 through the air-controlled hydraulic lifting valve 3; the hydraulic oil tank is used to store the hydraulic oil, the power take-off 2 provides mechanical power for the lifting pump 1, and the lifting pump 1 pumps out high-pressure hydraulic oil to push the lifting cylinder 5 to move; the air-controlled hydraulic lifting valve 3 switches the flow direction of the hydraulic oil to realize the lifting, middle stop and lowering of the lifting cylinder 5; the travel switch 4 detects the position state of the lifting cylinder 5; the air-controlled limit valve 6 automatically switches the air-controlled limit valve 6 to the middle stop position after the lifting is in place, saving energy; the manual lifting valve 7 manually controls the switching of the air-controlled hydraulic lifting valve 3; the P port of the solenoid valve DT6 is connected to the air source, and the R port is connected to the descending air port of the manual lifting valve 7, The A port is connected to the descending control end of the air-controlled hydraulic lifting valve 3; the P port of the solenoid valve DT7 is connected to the air source, the R port is connected to the lifting air port of the manual lifting valve 7, the A port is connected to the air inlet of the air-controlled limit valve 6, and the air outlet of the air-controlled limit valve 6 is connected to the lifting control end of the air-controlled hydraulic lifting valve 3. The solenoid valve DT7 can control the valve through an electrical signal to control the switching of the air-controlled hydraulic lifting valve 3; the P port of the solenoid valve DT8 is connected to the air source, the A port is connected to the air inlet of the power take-off 2, and the R port is connected to the air outlet of the manual power take-off valve 8. The solenoid valve DT8 can control the valve through an electrical signal to control the on and off of the power take-off 2; the manual lifting valve 7 and the manual power take-off valve 8 are both connected to the air source.

[0020] When the vehicle is in unmanned driving mode, when the vehicle runs to the designated unloading location, the mine dispatching system issues a lifting command to the on-board computer. The computer first energizes the electromagnet DT8, so that the power take-off 2 is combined with the lifting pump 1, driving the lifting pump 1 to rotate; then energizes the electromagnet DT7, and under the action of air pressure, the lifting valve is switched to the lifting position, and the oil outlet of the lifting pump 1 is connected to the lifting cylinder 5 to lift the cargo box; the travel switch 4 that has fallen to the position feedbacks to the computer that the cargo box has left the frame, and the vehicle is prohibited from moving at this time. During the lifting process, when it is necessary to stop, the computer cuts off the power to the electromagnet DT7 to achieve a mid-stop of the cargo box; when the lifting is in place, it will trigger the lifting travel switch 4, and the travel switch 4 feedbacks to the computer that the cargo box has been lifted in place, and then the computer will cut off the power to the electromagnets DT7 and DT8. When it is necessary to descend, the computer energizes the electromagnet DT6, the lifting valve switches to the descending position, the lifting cylinder 5 is connected to the hydraulic oil tank, and the hydraulic oil in the lifting cylinder 5 flows back to the tank to realize the descent of the cargo box; when the cargo box is lowered into place, it will trigger the descent limit switch 4, and the limit switch 4 will feedback to the computer that the cargo box has been lowered into place, and the vehicle can move at this time.

[0021] When the vehicle is in manned driving mode, the two-position three-way pneumatic solenoid valves are all in the middle position, which is equivalent to the function of the air pipe; when lifting is required, first press the power take-off 2 switch, and then move the lifting handle to the lifting position, and the cargo box can be lifted. When lowering is required, move the handle to the lowering position to lower it, and stop lifting when it is moved to the middle stop position.

Claims

1. A gas-electric controlled wide-body mining dump truck hydraulic lifting control system, characterized in that: It includes a lifting cylinder, a travel switch for detecting the position status of the lifting cylinder, a hydraulic oil tank, a lifting pump, a power take-off for driving the lifting pump, an air-controlled hydraulic lifting valve for switching the hydraulic flow direction, a manual lifting valve for manually controlling the air-controlled hydraulic lifting valve, a manual power take-off valve connected to the manual lifting valve, an air-controlled limit valve for controlling the lifting cylinder, a solenoid valve DT6 for switching the air-controlled hydraulic lifting valve to a descending position, a solenoid valve DT7 for switching the air-controlled hydraulic lifting valve to a lifting position, and a solenoid valve DT8 for controlling the power take-off; the hydraulic oil pumped out by the lifting pump controls the lifting of the lifting cylinder via the air-controlled hydraulic lifting valve.

2. The gas-electric controlled wide-body mining dump truck hydraulic lifting control system according to claim 1 is characterized by: The solenoid valve DT7 is a two-position three-way pneumatic solenoid valve.

3. The hydraulic lifting control system of a gas-electric controlled wide-body mining dump truck according to claim 1 is characterized in that: The P port of the solenoid valve DT6 is connected to the air source, the R port is connected to the descending air port of the manual lifting valve, and the A port is connected to the descending control end of the air-controlled hydraulic lifting valve.

4. The gas-electric controlled wide-body mining dump truck hydraulic lifting control system according to claim 1 is characterized in that: The P port of the solenoid valve DT7 is connected to the air source, the R port is connected to the lifting air port of the manual lifting valve, the A port is connected to the air inlet of the air-controlled limit valve, and the air outlet of the air-controlled limit valve is connected to the lifting control end of the air-controlled hydraulic lifting valve.

5. The hydraulic lifting control system of a gas-electric controlled wide-body mining dump truck according to claim 1 is characterized in that: The P port of the solenoid valve DT8 is connected to the air source, the A port is connected to the air inlet of the power take-off, and the R port is connected to the air outlet of the manual power take-off valve.

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