Hydraulic control system for pitching mechanism of stacker

Abstract

The invention discloses a hydraulic control system for a pitching mechanism of a stacker, which comprises a loop formed by communicating a main power element unit, a control element unit and an execution element unit through an oil path, and further comprises an emergency power element unit connected with the main power element unit in parallel. The main power element unit comprises a swash plate type variable displacement piston pump, and the swash plate type variable displacement piston pump provides hydraulic power for extension and retraction of piston rods of double oil cylinders of the execution element unit; a three-position four-way electromagnetic directional valve of the control element unit can change extending and retracting of piston rods of the double oil cylinders, a one-way throttle valve adjusts the extending and retracting speed of the pistons of the double oil cylinders, and a hydraulic control two-way lock controls the piston rods of the double oil cylinders to be fixed at one position. When the main power element unit breaks down, an oil inlet path is switched to the emergency power unit through the two-position two-way electromagnetic directional valve. When the main pump breaks down, the standby power source is switched rapidly, and the out-of-control risk of the cantilever belt conveyor is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic control of engineering machinery, in particular to a hydraulic control system for a pitching mechanism of a stacker. Background Art

[0002] As the main equipment in the material yard, the stacker greatly improves the stacking efficiency of materials. The extension and retraction of the pitch mechanism cylinder of the stacker can adjust the angle of the cantilever belt conveyor and increase the height of the stacked materials.

[0003] At present, the hydraulic system of the stacker's tilting mechanism has the following defects: 1. Single oil circuit design, when the main pump fails, it is impossible to quickly switch to the backup power source, resulting in the risk of cantilever belt conveyor losing control; 2. Lack of real-time working condition monitoring, inability to predict the life of hydraulic components, and high maintenance costs. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the existing stacker pitch mechanism hydraulic system adopts a single oil circuit design. When the main pump fails, it is impossible to quickly switch to the backup power source, resulting in the risk of the cantilever belt conveyor losing control. In order to solve the above problem, a hydraulic control system for the pitch mechanism of a stacker is provided.

[0005] The object of the present invention is achieved in the following manner: A hydraulic control system for a pitching mechanism of a stacker, the hydraulic control system comprising a circuit consisting of a main power element unit, a control element unit and an actuator unit connected via an oil circuit, the hydraulic control system also comprising an emergency power element unit, the emergency power element unit being arranged in parallel with the main power element unit.

[0006] The main power element includes a swash plate variable piston pump 3, the control element unit includes a two-position two-way electromagnetic reversing valve 5, a three-position four-way electromagnetic reversing valve 6, a one-way throttle valve 7, a hydraulically controlled two-way lock 8, and a relief valve 9, and the actuator includes a symmetrically arranged double oil cylinder 10. The swash plate variable piston pump 3 draws oil from the oil tank 15 through a pipeline, and the oil of the swash plate variable piston pump 3 passes through the two-position two-way electromagnetic reversing valve 5, the three-position four-way electromagnetic reversing valve 6, the one-way throttle valve 7, the hydraulically controlled two-way lock 8, and the relief valve 9 to the rodless chamber of the oil cylinder 10, and the rod chamber of the oil cylinder 10 returns to the oil tank through the relief valve 9, the hydraulically controlled two-way lock 8, the one-way throttle valve 7, and the three-position four-way electromagnetic reversing valve 6.

[0007] A one-way valve 4 is provided on the oil path between the swash plate variable displacement plunger pump 3 and the two-position two-way electromagnetic reversing valve 5 .

[0008] The emergency power element includes a hydraulic motor 11, a permanent magnet generator 12, a supercapacitor 13 and a gear directional pump 2 connected in sequence. The hydraulic motor is driven by the return oil pressure. The output of the hydraulic motor is connected to the permanent magnet generator 12, which drives the permanent magnet motor 12 to charge the supercapacitor 13. The supercapacitor 13 supplies power to the gear directional pump 2. The gear directional pump 2 draws oil from the oil tank 15 through a pipeline. The oil of the gear directional pump 2 is connected to the two-position two-way electromagnetic reversing valve 5.

[0009] An oil inlet filter 1 is respectively provided on the pipelines between the swash plate variable displacement piston pump 3 and the gear directional pump 2 and the oil tank 15 , and an oil return filter 14 is provided on the pipeline between the three-position four-way solenoid reversing valve 6 and the oil tank 15 .

[0010] A one-way valve 4 and an accumulator 16 are further provided on the oil circuit between the gear directional pump 2 and the two-position two-way electromagnetic reversing valve 5 .

[0011] The hydraulic control system also includes a monitoring and protection unit, which includes a pressure transmitter 17 arranged on the cylinder 10 for monitoring the pressure value of the inner cavity of the cylinder 10, a displacement sensor 18 built into the piston rod of the cylinder 10, a temperature sensor 19 for monitoring the temperature of the oil in the oil tank 15, and a three-axis acceleration sensor 20 arranged on the oil tank 15 for monitoring the vibration value of the system.

[0012] The invention provides an emergency power unit. When the main power unit fails, a two-position, two-way electromagnetic reversing valve switches the oil supply to the emergency power unit. This allows for rapid switching to a backup power source in the event of a main pump failure, significantly reducing the risk of the cantilever belt conveyor losing control. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a system principle diagram of the present invention.

[0014] Among them, 1- oil inlet filter, 2- gear directional pump, 3- inclined plate variable piston pump, 4- one-way valve, 5- two-position two-way solenoid reversing valve, 6- three-position four-way solenoid reversing valve, 7- one-way throttle valve, 8- hydraulically controlled two-way lock, 9- overflow valve, 10- oil cylinder, 11- hydraulic motor, 12- permanent magnet motor, 13- supercapacitor, 14- return oil filter, 15- oil tank, 16- accumulator, 17- pressure sensor, 18- displacement sensor, 19- temperature sensor, 20- three-axis acceleration sensor. DETAILED DESCRIPTION

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

[0016] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same technical meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0017] like Figure 1 As shown, the present invention discloses a hydraulic control system for the pitching mechanism of a stacker, wherein the hydraulic control system includes a circuit composed of a main power element unit, a control element unit and an execution element unit connected via an oil circuit, and the hydraulic control system also includes an emergency power element unit, which is arranged in parallel with the main power element unit.

[0018] The main power element includes a swash plate variable piston pump 3, the control element unit includes a two-position two-way electromagnetic reversing valve 5, a three-position four-way electromagnetic reversing valve 6, a one-way throttle valve 7, a hydraulically controlled two-way lock 8, and a relief valve 9, and the actuator includes a symmetrically arranged double oil cylinder 10, the piston rod of the double oil cylinder 10 can be extended and retracted.

[0019] The swash plate variable piston pump 3 draws oil from the oil tank 15 through a pipeline to provide power for the stacker's pitch mechanism movement; the oil of the swash plate variable piston pump 3 passes through the two-position two-way electromagnetic reversing valve 5, the three-position four-way electromagnetic reversing valve 6, the one-way throttle valve 7, the hydraulically controlled two-way lock 8, and the relief valve 9 to the rodless chamber of the oil cylinder 10, and the rod chamber of the oil cylinder 10 passes through the relief valve 9, the hydraulically controlled two-way lock 8, the one-way throttle valve 7, and the three-position four-way electromagnetic reversing valve 6 back to the oil tank.

[0020] The two-position, two-way solenoid directional valve 5 controls the switching of the power oil circuit between the main power element unit and the emergency power element unit; the three-position, four-way solenoid directional valve 5 controls the extension and retraction of the piston rod of the dual oil cylinder 10, and the one-way throttle valve 7 adjusts the speed of extension and retraction of the piston rod of the dual oil cylinder 10; when the internal cavity pressure value of the dual oil cylinder 10 is too high, the relief valve 9 starts to overflow, controlling the internal cavity pressure value of the dual oil cylinder; A one-way valve 4 is provided on the oil path between the swash plate variable displacement plunger pump 3 and the two-position two-way electromagnetic reversing valve 5 .

[0021] The emergency power element includes a hydraulic motor 11, a permanent magnet generator 12, a supercapacitor 13 and a gear directional pump 2 connected in sequence. The hydraulic motor is driven by the return oil pressure. The output of the hydraulic motor is connected to the permanent magnet generator 12, which drives the permanent magnet motor 12 to charge the supercapacitor 13. The supercapacitor 13 supplies power to the gear directional pump 2. The gear directional pump 2 draws oil from the oil tank 15 through a pipeline. The oil of the gear directional pump 2 is connected to the two-position two-way electromagnetic reversing valve 5.

[0022] An oil inlet filter 1 is respectively provided on the pipelines between the swash plate variable displacement piston pump 3 and the gear directional pump 2 and the oil tank 15 , and an oil return filter 14 is provided on the pipeline between the three-position four-way solenoid reversing valve 6 and the oil tank 15 .

[0023] A one-way valve 4 and an accumulator 16 are further provided on the oil circuit between the gear directional pump 2 and the two-position two-way electromagnetic reversing valve 5 .

[0024] The hydraulic control system also includes a monitoring and protection unit, which includes a pressure transmitter 17 arranged on the cylinder 10 for monitoring the pressure value of the inner cavity of the cylinder 10, a displacement sensor 18 built into the piston rod of the cylinder 10, a temperature sensor 19 for monitoring the temperature of the oil in the oil tank 15, and a three-axis acceleration sensor 20 arranged on the oil tank 15 for monitoring the vibration value of the system.

[0025] In one embodiment, the swash plate variable piston pump 3 sucks oil through the oil inlet filter 1 to provide hydraulic power for the oil circuit. The one-way valve 4 prevents the hydraulic oil in the oil circuit from flowing back. The three-position four-way electromagnetic reversing valve 6 controls the extension and retraction of the piston rod of the oil cylinder 10. The one-way throttle valve 7 controls the extension and retraction speed of the piston rod of the oil cylinder 10. The hydraulically controlled two-way lock 8 controls the piston rod of the oil cylinder 10 to be fixed in one position. When the pressure value in the inner cavity of the oil cylinder 10 is too high, the overflow valve 9 starts to overflow and controls the pressure value in the inner cavity of the double oil cylinder. The return oil pressure drives the hydraulic motor 11, which drives the permanent magnet motor 12 to charge the supercapacitor 13. The return oil returns to the oil tank through the return oil filter 14, and the oil circuit forms a closed loop.

[0026] In one embodiment, when the swash plate variable displacement piston pump 3 fails and is unable to provide hydraulic power to the oil circuit, the two-position, two-way solenoid reversing valve 5 switches positions, and the gear directional pump 2, powered by the supercapacitor 13, provides hydraulic power to the oil circuit. Simultaneously, the accumulator 16 releases pressure to maintain the pressure level throughout the oil circuit when the hydraulic power is switched.

[0027] In one embodiment, a pressure transmitter 17 monitors the pressure value in the oil cylinder 10; a displacement sensor 18 is built into the piston rod of the oil cylinder 10 to monitor the displacement of the piston rod of the oil cylinder 10 when it is extended and retracted; a temperature sensor 19 monitors the temperature of the oil in the oil tank 15; and a triaxial acceleration sensor 20 monitors the vibration value of the system. When the above monitoring values ​​exceed the normal range, the system is shut down for inspection to reduce maintenance costs. The hydraulic control system for the stacker's pitch mechanism, provided by the present invention, includes a main power element unit, a control element unit, an actuator unit, an auxiliary element unit, an emergency power element unit, and a monitoring and protection unit. The main power element unit includes a swash plate variable displacement piston pump, which provides hydraulic power for extending and retracting the piston rods of the actuator unit's dual oil cylinders. The control element unit's three-position, four-way solenoid directional valve adjusts the extension and retraction speed of the dual oil cylinders' piston rods, a one-way throttle valve adjusts the speed of piston extension and retraction, and a hydraulically controlled two-way lock secures the piston rods of the dual oil cylinders in a fixed position. When the internal pressure of the dual oil cylinders is excessive, the relief valve initiates overflow flow, controlling the internal pressure. The hydraulic motor in the emergency power unit drives a permanent magnet generator to charge a supercapacitor, which provides power for the fixed-displacement gear pump. If the main power element unit fails, the two-position, two-way solenoid directional valve switches the oil supply to the emergency power unit. Rapidly switching to a backup power source in the event of a main pump failure significantly reduces the risk of cantilever belt conveyor loss of control.

[0028] The monitoring and protection unit of this invention features a pressure transmitter that monitors the pressure within the dual oil cylinders; a displacement sensor built into the dual oil cylinder piston rods that monitors the distance they extend and retract; a temperature sensor that monitors the temperature of the oil in the tank; and a triaxial acceleration sensor that monitors the system's vibration. When these monitored values ​​exceed the normal range, the system is shut down for inspection, reducing maintenance costs.

[0029] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several changes and improvements can be made without departing from the overall concept of the present invention, and these should also be regarded as the scope of protection of the present invention.

Claims

1. A hydraulic control system for a pitching mechanism of a stacker, characterized by: The hydraulic control system includes a circuit composed of a main power element unit, a control element unit and an actuator unit connected via an oil circuit. The hydraulic control system also includes an emergency power element unit, which is arranged in parallel with the main power element unit.

2. The hydraulic control system for the pitching mechanism of a stacker according to claim 1, characterized in that: The main power element includes a swash plate type variable piston pump (3), the control element unit includes a two-position two-way electromagnetic reversing valve (5), a three-position four-way electromagnetic reversing valve (6), a one-way throttle valve (7), a hydraulically controlled two-way lock (8), and an overflow valve (9), and the actuator includes a symmetrically arranged double oil cylinder (10). The swash plate type variable piston pump (3) draws oil from the oil tank (15) through a pipeline, and the oil of the swash plate type variable piston pump (3) passes through the two-position two-way electromagnetic reversing valve (5), the three-position four-way electromagnetic reversing valve (6), the one-way throttle valve (7), the hydraulically controlled two-way lock (8), and the overflow valve (9) to the rodless chamber of the oil cylinder (10), and the rod chamber of the oil cylinder (10) returns to the oil tank through the overflow valve (9), the hydraulically controlled two-way lock (8), the one-way throttle valve (7), and the three-position four-way electromagnetic reversing valve (6).

3. The hydraulic control system for the pitching mechanism of a stacker according to claim 2, characterized in that: A one-way valve (4) is provided on the oil circuit between the swash plate variable displacement plunger pump (3) and the two-position two-way electromagnetic reversing valve (5).

4. The hydraulic control system for the pitching mechanism of a stacker according to claim 2, characterized in that: The emergency power element comprises a hydraulic motor (11), a permanent magnet generator (12), a super capacitor (13) and a gear directional pump (2) connected in sequence, wherein the hydraulic motor is driven by return oil pressure, and the output of the hydraulic motor is connected to the permanent magnet generator (12), driving the permanent magnet motor (12) to charge the super capacitor (13), and the super capacitor (13) supplies power to the gear directional pump (2), and the gear directional pump (2) draws oil from the oil tank (15) through a pipeline, and the oil of the gear directional pump (2) is connected to a two-position two-way electromagnetic reversing valve (5).

5. The hydraulic control system for the pitching mechanism of a stacker according to claim 4, characterized in that: An oil inlet filter (1) is provided on the pipelines between the swash plate variable displacement plunger pump (3) and the gear directional pump (2) and the oil tank (15), respectively, and an oil return filter (14) is provided on the pipeline between the three-position four-way electromagnetic reversing valve (6) and the oil tank (15).

6. The hydraulic control system for the pitching mechanism of a stacker according to claim 4, characterized in that: A one-way valve (4) and an accumulator (16) are also provided on the oil circuit between the gear directional pump (2) and the two-position, two-way electromagnetic reversing valve (5).

7. The hydraulic control system for the pitching mechanism of a stacker according to claim 1, characterized in that: The hydraulic control system further includes a monitoring and protection unit, which includes a pressure transmitter (17) provided on the oil cylinder (10) for monitoring the pressure value of the inner cavity of the oil cylinder (10), a displacement sensor (18) built into the piston rod of the oil cylinder (10), a temperature sensor (19) for monitoring the temperature of the oil in the oil tank (15), and a three-axis acceleration sensor (20) provided on the oil tank (15) for monitoring the vibration value of the system.

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