Emergency starting system of open-cast mining machine

Abstract

The invention discloses an emergency starting system of an open-cast mining machine, which comprises a set of main hydraulic loop and a set of independent standby power unit which are connected through a multi-position reversing valve. Through oil way switching of the multi-position reversing valve, when an engine works normally, the main hydraulic system and the standby power unit system operate independently; when the engine breaks down, the reversing valve is operated to switch oil ways, so that pressure oil of the standby power unit enters the oil cylinder control valve of the main system, the oil cylinder for controlling the core safety function of the whole machine is driven to conduct emergency operation, and therefore the mining machine is adjusted to be in a safe state. The invention provides a built-in, reliable and easy-to-operate emergency power scheme for the engine fault of the open-cast mining machine, solves the problems that the state of the whole machine cannot be adjusted when the engine fault occurs, and the operation is difficult and unsafe by depending on external equipment, remarkably reduces the labor intensity and potential safety hazards of operators, and improves the working efficiency. And the reliability and the safety of the whole machine are improved.

Description

Technical Field

[0001] This invention relates to a control system, and more particularly to an emergency start system for an open-pit mining machine. Background Technology

[0002] As a type of large-scale engineering machinery, open-pit mining machines typically operate in complex and harsh environments, presenting numerous unpredictable risk factors that pose a continuous threat to the safety of both the machine itself and the operators. In actual operation, the engine, as the core power source of the entire machine, is susceptible to failure. Once the engine fails, the entire machine loses its primary hydraulic power and can only remain stationary in the state it was in at the time of the failure.

[0003] Currently, the industry has relatively mature solutions for handling malfunctions to release the travel brake so that the machine can be towed to a safe area. However, a more challenging problem arises when the machine is in operation (e.g., the working device is not raised, or the casing is open) at the time of the malfunction, requiring the entire machine to be adjusted to a safe driving position first. Adjusting these positions (such as raising the working device or closing the casing) becomes extremely difficult without hydraulic power. Existing technologies typically rely on basic mechanical means, such as directly disassembling the relevant cylinders to release pressure or manually adjusting the mechanical structure. This approach is not only cumbersome and time-consuming, but also often requires the cooperation of other mechanical equipment, posing a high safety risk. Furthermore, performing such operations under complex operating conditions may cause secondary damage to the equipment. Summary of the Invention

[0004] Purpose of the invention: The purpose of this invention is to provide an emergency start system for open-pit mining machines that effectively improves work efficiency and enhances safety.

[0005] Technical solution: The emergency start system for open-pit mining machines described in this invention includes a main hydraulic circuit, a backup power unit, and an oil circuit switching device; the main hydraulic circuit includes a main oil tank, a main hydraulic pump, a check valve, a main control valve, and an oil cylinder that performs the core safety functions of the entire machine, arranged sequentially along the oil circuit direction;

[0006] The oil circuit switching device is a multi-way directional valve, which has at least one pressure oil inlet, two working oil ports and one return oil port; the pressure oil inlet is connected to the oil outlet of the backup power unit, the first working oil port is connected to the oil inlet of at least one auxiliary function control valve, the second working oil port is connected to the oil inlet of the main control valve, and the return oil port is closed.

[0007] The multi-way directional valve is configured as follows:

[0008] In the first working position, the pressure oil inlet is connected to the first working oil port, and the backup power unit supplies oil for auxiliary functions;

[0009] In the second working position, the pressure oil inlet is connected to the second working oil port, and the backup power unit supplies oil to the main control valve to drive the oil cylinder for emergency operation.

[0010] Preferably, the main hydraulic circuit further includes a high-pressure filter disposed between the main hydraulic pump and the check valve.

[0011] Preferably, the backup power unit includes a first power unit and a second power unit, wherein the second power unit is a backup power unit for the first power unit.

[0012] Preferably, the first power unit is an electric pump; the second power unit is a manual pump.

[0013] Preferably, the auxiliary function control valve includes an auxiliary motor control valve and an auxiliary cylinder control valve; the auxiliary motor control valve is connected to the auxiliary motor, and the auxiliary cylinder control valve is connected to the auxiliary cylinder.

[0014] Preferably, the return port of the main control valve is connected to the oil tank, and the return port of the auxiliary function control valve is connected to the return port of the standby power unit.

[0015] Preferably, the system further includes an operating element for controlling the hydraulic cylinder and auxiliary function execution actions, the operating element being electrically or mechanically connected to the main control valve and the auxiliary function control valve.

[0016] Preferably, the main hydraulic pump is a variable displacement pump.

[0017] Preferably, the multi-way directional valve is a three-position four-way directional valve.

[0018] Preferably, the fuel tank in the standby power unit is connected to the main fuel tank.

[0019] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: (1) Improved operational safety, and can quickly adjust the machine to a safe state in the event of engine failure, thus avoiding danger; (2) Simple operation, no need to disassemble the oil cylinder or use external equipment, and emergency start can be completed by switching valves; (3) High system reliability, with the backup power unit using both electric and manual pumps as backups; (4) Effectively reduced labor intensity of operators and improved the working efficiency and reliability of the whole machine. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the hydraulic principle of the present invention. Detailed Implementation

[0021] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0022] As shown in the attached drawings, the present invention includes an oil tank 1, a variable pump 2, a high-pressure filter 3, a one-way valve 4, a cylinder control valve 5, a cylinder 6, a power unit 7, a reversing valve 8, an auxiliary motor control valve 9, an auxiliary motor 10, an auxiliary cylinder control valve 11, an auxiliary cylinder 12, and an operating element.

[0023] 1. System Connection Relationships

[0024] The S port of variable pump 2 is connected to oil tank 1, and the B port of variable pump 2 is connected to port 1 of check valve 4 through high pressure filter 3.

[0025] The P port of the reversing valve 8 is connected to the P port of the power unit 7, the T port of the reversing valve 8 is closed, the A port of the reversing valve 8 is connected to the P ports of the auxiliary motor control valve 9 and the auxiliary cylinder control valve 11 respectively, and the B port of the reversing valve 8 is connected to the 2 port of the check valve 4 and the P port of the cylinder control valve 5 respectively.

[0026] The T-port of the hydraulic cylinder control valve 5 and the T-port of the power unit 7 are connected to the oil tank 1, and the T-port of the auxiliary motor control valve 9 and the T-port of the auxiliary hydraulic cylinder control valve 11 are connected to the T-port of the power unit 7.

[0027] The hydraulic cylinder control valve 5 is connected to the hydraulic cylinder 6, the auxiliary motor control valve 9 is connected to the auxiliary motor 10, and the auxiliary hydraulic cylinder control valve 11 is connected to the auxiliary hydraulic cylinder 12.

[0028] The actuating element is electrically or mechanically connected to control valves 5, 9 and 11 to control the movement of the hydraulic cylinder and motor.

[0029] 2. Functions and Installation of Main Components

[0030] Hydraulic cylinder 6: Installed in the frame, outriggers, working device and other structures of the cold recycling machine, it controls the steering, lifting and lowering, opening and closing of the cover of the whole machine;

[0031] Auxiliary motor 10: Installed on the auxiliary device of the whole machine, as an auxiliary drive device for the milling reducer;

[0032] Auxiliary cylinder 12: Installed on the auxiliary device of the whole machine, driving the movement of the auxiliary device;

[0033] Power unit 7: includes electric pump 7-1 and manual pump 7-2, wherein the manual pump serves as a backup pump for the electric pump to ensure system reliability.

[0034] 3. System Working Principle

[0035] When the engine is operating normally: the three-position four-way directional valve 8 is in the left position. The variable pump 2 draws oil from the oil tank 1, and the pressurized oil passes through the high-pressure filter 3 and the check valve 4 into the cylinder control valve 5, driving the cylinder 6. The oil ultimately returns to the oil tank 1 through the T port of the cylinder control valve 5. At this time, the oil output from the power unit 7 enters the auxiliary control valves 9 and 11 through the P and A ports of the directional valve 8, driving the auxiliary motor 10 and the auxiliary cylinder 12. The return oil returns to the T port of the power unit 7. The main system and the power unit system do not interfere with each other.

[0036] In case of engine failure: Adjust the three-position four-way directional valve 8 to the right position. The pressurized oil output from the power unit 7 enters the P port of the cylinder control valve 5 through the P and B ports of the directional valve 8, thereby driving the cylinder 6 to perform emergency operations (such as raising the working device). The check valve 4 prevents the pressurized oil from back-impacting the high-pressure filter 3, causing damage to the high-pressure filter. The return oil from the cylinder control valve 5 returns to the main oil tank 1. The oil tank in the power unit is connected to the main oil tank 1 to prevent the pump in the power unit from sucking in air. If the electric pump 7-1 fails, the backup manual pump 7-2 can be used to continue operation.

Claims

1. An emergency start system for an open-pit mining machine, characterized in that, It includes a main hydraulic circuit, a backup power unit (7) and an oil circuit switching device; the main hydraulic circuit includes a main oil tank (1), a main hydraulic pump (2), a check valve (4), a main control valve (5) and an oil cylinder (6) that performs the core safety functions of the whole machine, arranged in sequence along the oil circuit direction. The oil circuit switching device is a multi-way directional valve (8) with at least one pressure oil inlet, two working oil ports and one return oil port; the pressure oil inlet (P) is connected to the oil outlet of the backup power unit (7), the first working oil port (A) is connected to the oil inlet of at least one auxiliary function control valve, the second working oil port (B) is connected to the oil inlet of the main control valve (5), and the return oil port (T) is closed. The multi-way directional valve (8) is configured as follows: In the first working position, the pressure oil inlet (P) is connected to the first working oil port (A), and the backup power unit (7) supplies oil for auxiliary functions; In the second working position, the pressure oil inlet (P) is connected to the second working oil port (B), and the backup power unit (7) supplies oil to the main control valve (5) to drive the oil cylinder (6) for emergency operation.

2. The emergency start system according to claim 1, characterized in that, The main hydraulic circuit also includes a high-pressure filter (3) disposed between the main hydraulic pump (2) and the check valve (4).

3. The emergency start system according to claim 1, characterized in that, The backup power unit (7) includes a first power unit and a second power unit, wherein the second power unit is a backup power unit of the first power unit.

4. The emergency start system according to claim 3, characterized in that, The first power unit uses an electric pump (7-1); the second power unit uses a manual pump (7-2).

5. The emergency start system according to claim 1, characterized in that, The auxiliary function control valve includes an auxiliary motor control valve (9) and an auxiliary cylinder control valve (11); the auxiliary motor control valve (9) is connected to the auxiliary motor (10), and the auxiliary cylinder control valve (11) is connected to the auxiliary cylinder (12).

6. The emergency start system according to claim 1, characterized in that, The return port of the main control valve (5) is connected to the oil tank (1), and the return port of the auxiliary function control valve is connected to the return port of the backup power unit (7).

7. The emergency start system according to claim 1, characterized in that, It also includes a control element for controlling the hydraulic cylinder (6) and auxiliary function execution actions, the control element being electrically or mechanically connected to the main control valve (5) and the auxiliary function control valve.

8. The emergency start system according to claim 1, characterized in that, The main hydraulic pump (2) is a variable pump.

9. The emergency start system according to claim 1, characterized in that, The multi-way directional valve (8) is a three-position four-way directional valve.

10. The emergency start system according to claim 9, characterized in that, The oil tank in the backup power unit (7) is connected to the main oil tank (1).

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