A synchronous control device and synchronous control method for a hydraulic flap unloading machine platform

Abstract

The invention discloses a synchronous control device and synchronous control method for a hydraulic flap unloading machine platform, comprising two five-stage plunger hydraulic cylinders, two hydraulically controlled one-way valves, a bypass oil leakage correction valve, a flow splitter and collector valve, an electromagnetic reversing valve, an electro-hydraulic reversing valve, a programmable PLC controller, two one-way valves, an overflow valve, an oil pump motor unit and an oil tank. The flow splitter and collector valves are used to control the speeds of the two hydraulic cylinders to be basically consistent. The deflection angle of the platform is detected by a dual-axis inclination sensor. When the deflection angle exceeds plus or minus 0.5, the programmable PLC controller controls the bypass oil leakage correction valve to be electrified and drain oil. When the deflection angle is corrected to plus or minus 0.1 degrees, the programmable PLC controller controls the bypass oil leakage correction valve to lose power. The programmable PLC controller controls the bypass oil leakage correction valve to drain and correct oil, thereby performing synchronous closed-loop control, thereby realizing synchronous operation of the two five-stage plunger hydraulic cylinders. The device has high synchronization accuracy, simple control, convenient installation, large flow range and low manufacturing cost.

Description

Technical Field

[0001] The present invention belongs to the technical field of a flap unloading machine platform, and in particular relates to a synchronous control device and a synchronous control method of a hydraulic flap unloading machine platform. Background Art

[0002] The hydraulic flap unloading platform is a car unloading device that integrates electronic weighing and automatic unloading. It is currently widely used in all industries with bulk materials, such as grain and oil processing, feed processing, and mining. The flipping of the hydraulic flap unloading platform is completed by the lifting of two five-stage plunger hydraulic cylinders on both sides of the platform. The platform is lifted by the five-stage plunger hydraulic cylinder to the inclination angle required by the customer. In order to ensure the smooth operation of the hydraulic flap unloading platform, the synchronous operation of the two five-stage plunger hydraulic cylinders is particularly critical. During the lifting process of the hydraulic flap unloading platform, the platform deflection angle is too large, the platform is out of alignment, and the vibration occurs due to the large synchronization deviation of the two five-stage plunger hydraulic cylinders. In severe cases, safety accidents such as vehicle tipping may occur. Therefore, from the perspective of the safety and reliability of the hydraulic flap unloading platform, higher requirements are put forward for the synchronization accuracy of the two hydraulic cylinders in the smooth lifting of the hydraulic flap unloading platform. Due to the strict cost control in the hydraulic flap unloading platform industry, if a proportional valve or servo valve and a displacement sensor are used to form a closed loop for synchronous control, the synchronization accuracy is high, and key components rely on imports, which are expensive and difficult to maintain; and the two five-stage plunger hydraulic cylinders have a long working stroke and a large capacity, and it is difficult to control them using volume synchronization; therefore, flow synchronization control is currently a common method, but the flow synchronization accuracy is relatively low and the terminal error is high, so it cannot meet the synchronization requirements of the hydraulic flap unloading platform. Summary of the invention

[0003] The object of the present invention is to overcome the deficiencies of the above-mentioned prior art and to provide a synchronous control device and a synchronous control method for a hydraulic flap unloading machine platform.

[0004] The technical solution provided by the present invention is as follows: a synchronous control device for a hydraulic flap unloading platform, which includes two five-stage plunger hydraulic cylinders and an oil tank connected to the unloading platform, characterized in that the oil tank is connected to an oil pump motor unit, and the oil pump motor unit is respectively connected to the inlet of a second one-way valve and an inlet of a relief valve through a hydraulic oil pipe; the outlet of the second one-way valve is respectively connected to the P port of an electro-hydraulic reversing valve and the inlet of a first one-way valve, the outlet of the first one-way valve is respectively connected to the control oil port X port of the electro-hydraulic reversing valve and the P port of an electromagnetic reversing valve, and the A port of the electromagnetic reversing valve is respectively connected to the control oil port X port of two hydraulically controlled one-way valves; the electro-hydraulic The A port of the reversing valve is connected to the inlet of the diverter and collector valve, and the two outlets of the diverter and collector valve are respectively connected to the inlet of two hydraulically controlled one-way valves, and the outlets of the two hydraulically controlled one-way valves are respectively connected to the rodless chambers of two five-stage plunger hydraulic cylinders; the A port and B port of the bypass oil leakage correction valve are respectively connected to the inlet of the two hydraulically controlled one-way valves, and the T port of the bypass oil leakage correction valve, the T port of the electro-hydraulic reversing valve, and the outlet of the overflow valve are all connected back to the oil tank; a dual-axis inclination sensor is provided on the platform of the hydraulic flap unloading machine, and the dual-axis inclination sensor is connected to the programmable PLC controller, and the programmable PLC controller is connected to the bypass oil leakage correction valve and the electromagnetic reversing valve.

[0005] A synchronous control method for a hydraulic flap unloading machine platform, characterized in that it specifically comprises the following steps:

[0006] 1) The oil pump motor unit sucks oil from the oil tank, and the oil flows into the overflow valve through the hydraulic oil pipe and then flows into the oil tank to achieve overload protection; the oil flows through the hydraulic oil pipe and the second one-way valve to the P port of the electro-hydraulic reversing valve, and the electro-hydraulic reversing valve is energized in parallel, and the P port of the electro-hydraulic reversing valve is connected to the A port, and the oil is supplied to the flow dividing and collecting valve through the A port of the electro-hydraulic reversing valve, and then enters the two hydraulically controlled one-way valves through the flow dividing and collecting valve, and then enters the rodless chambers of the two five-stage plunger hydraulic cylinders respectively, thereby realizing the lifting of the two five-stage plunger hydraulic cylinders;

[0007] 2) A part of the oil passes through the second one-way valve and passes through the first one-way valve to provide oil to the control oil port X of the electro-hydraulic reversing valve and the P port of the electromagnetic reversing valve. When the electromagnetic reversing valve is energized, the P port of the electromagnetic reversing valve is connected to the A port, and the oil flows into the control oil port X of the two hydraulic control one-way valves, opening the two hydraulic control one-way valves; the oil in the two five-stage plunger hydraulic cylinders flows into the diverter and collector valves in the opposite direction through the two hydraulic control one-way valves. At this time, the electro-hydraulic reversing valve is energized in the cross position, and the A port of the electro-hydraulic reversing valve is connected to the T port. The oil finally returns to the oil tank through the T port of the electro-hydraulic reversing valve, realizing the descent of the five-stage plunger hydraulic cylinder; the speed of the two five-stage plunger hydraulic cylinders is controlled by the diverter and collector valve, so that their lifting speeds are consistent and synchronous operation is achieved;

[0008] 3) When the two five-stage plunger hydraulic cylinders are out of sync, the dual-axis inclination sensor on the hydraulic flap unloading platform detects the deflection angle of the hydraulic flap unloading platform. The maximum deflection angle of the hydraulic flap unloading platform is plus or minus 0.5 degrees;

[0009] 4) During the lifting or lowering process, when the deflection angle is greater than positive 0.5 degrees, the programmable PLC controller controls the electromagnetic reversing valve to be energized, and its P port is connected to A port. The pressure oil enters the P port of the electromagnetic reversing valve from the outlet of the first side check valve, and flows into the control oil port X of the hydraulic control check valve through the A port, pushing open the hydraulic control check valve; the programmable PLC controller simultaneously opens the switch of the bypass oil leakage correction valve, so that the right electromagnet is energized, the bypass oil leakage correction valve is switched to the parallel position, and its B port is connected to the T port. The oil in the rodless chamber of the right five-stage plunger hydraulic cylinder flows in the opposite direction through the hydraulic control check valve to the B port of the bypass oil leakage correction valve, and is discharged back to the oil tank from the T port;

[0010] 5) When the deflection angle is greater than negative 0.5 degrees, the programmable PLC controller controls the electromagnetic reversing valve to be energized, and its P port is connected to A port. The pressure oil enters the P port of the electromagnetic reversing valve from the outlet of the first side check valve, and flows into the control oil port X port of the hydraulic control check valve through A port, pushing open the hydraulic control check valve; the programmable PLC controller simultaneously turns on the switch of the bypass oil leakage correction valve, so that the electromagnet on its left side is energized, and the bypass oil leakage correction valve is switched to the cross position, and its A port is connected to T port. The oil in the rodless chamber of the left five-stage plunger hydraulic cylinder flows in the opposite direction through the hydraulic control check valve to the A port of the bypass oil leakage correction valve, and is discharged back to the oil tank from T port;

[0011] 6) After the programmable PLC controller controls the bypass oil leakage correction valve to leak oil for 80ms, the switch of the bypass oil leakage correction valve is closed, the solenoid loses power, and the bypass oil leakage correction valve returns to the middle position; at this time, if the deflection angle is not corrected to within plus or minus 0.1 degrees, continue the above actions until the deflection angle is controlled to within plus or minus 0.1 degrees, stop the correction, and the bypass oil leakage correction valve loses power.

[0012] The beneficial effects of the present invention are as follows: the two five-stage plunger hydraulic cylinders of the present invention are connected to the bypass oil leakage correction valve, the diverter and collector valve, and the electromagnetic reversing valve through two hydraulically controlled one-way valves, and the oil pump motor unit connected to the oil tank is connected to the electro-hydraulic reversing valve and the electromagnetic reversing valve through a one-way valve. The diverter and collector valve controls the speeds of the two five-stage plunger hydraulic cylinders to remain basically consistent. The deflection angle of the hydraulic flap unloading machine platform is detected by a dual-axis inclination sensor and fed back to the programmable PLC controller. The programmable PLC controller controls the bypass oil leakage correction valve to perform synchronous closed-loop control, thereby realizing the synchronous operation of the two five-stage plunger hydraulic cylinders, which has high synchronization accuracy, simple control, convenient installation, large flow range, and low manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1It is a schematic diagram of the structural principle of the present invention. Implementation

[0014] The specific implementation of the present invention is described in detail below with reference to the accompanying drawings:

[0015] like Figure 1 As shown, a synchronous control device for a hydraulic flap unloading platform includes two five-stage plunger hydraulic cylinders 1 connected to the unloading platform, two hydraulically controlled one-way valves 2, a bypass oil leakage correction valve 3, a diverter and collector valve 4, an electromagnetic reversing valve 5, an electro-hydraulic reversing valve 6, a programmable PLC controller 7, a first one-way valve 8, a second one-way valve 9, an overflow valve 10, an oil pump motor unit 11 and an oil tank 12.

[0016] The oil pump motor group 11 is connected to the oil tank 12, and the oil pump motor group 11 is connected to the inlet of the second check valve 9 and the inlet of the overflow valve 10 through the hydraulic oil pipe. The outlet of the second check valve 9 is connected to the P port of the electro-hydraulic reversing valve 6 and the inlet of the first check valve 8 respectively, and the outlet of the first check valve 8 is connected to the control oil port X port of the electro-hydraulic reversing valve 6 and the P port of the electromagnetic reversing valve 5 respectively, and the A port of the electromagnetic reversing valve 5 is connected to the control oil port X port of the two hydraulically controlled check valves 2 respectively. The A port of the electro-hydraulic reversing valve 6 is connected to the inlet of the diverter and collector valve 4, and the two outlets of the diverter and collector valve 4 are connected to the inlet of the two hydraulically controlled check valves 2 respectively, and the outlets of the two hydraulically controlled check valves 2 are connected to the rodless chambers of the two five-stage plunger hydraulic cylinders 1 respectively. The A port and the B port of the bypass oil leakage correction valve 3 are connected to the inlet of the two hydraulically controlled check valves 2 respectively, and the bypass oil leakage correction valve 3 realizes the oil leakage correction function by reversing. The T port of the bypass oil leakage correction valve 3, the T port of the electro-hydraulic reversing valve 6, and the outlet of the overflow valve 10 are all connected back to the oil tank 12. A dual-axis inclination sensor 13 is provided on the hydraulic flap unloading machine platform, and the dual-axis inclination sensor 13 is connected to the programmable PLC controller 7, and the programmable PLC controller 7 is connected to the bypass oil leakage correction valve 3 and the electromagnetic reversing valve 5.

[0017] A synchronous control method for a hydraulic flap unloading machine platform, the oil pump motor unit 11 sucks oil from the oil tank 12, the oil flows into the inlet of the second one-way valve 9 through the hydraulic oil pipe, and the other branch is connected to the overflow valve 10 to realize the overload protection of the hydraulic system. The oil passes through the outlet of the second one-way valve 9 to the P port of the electro-hydraulic reversing valve 6, the electro-hydraulic reversing valve 6 is energized in parallel, the P port of the electro-hydraulic reversing valve 6 is connected to the A port, and the oil is supplied to the flow dividing and collecting valve 4 through the A port of the electro-hydraulic reversing valve 6, and enters the inlet of the two hydraulic control one-way valves 2 through the two outlets of the flow dividing and collecting valve 4, and the pressure oil enters the rodless chambers of the two five-stage plunger hydraulic cylinders 1 through the outlets of the two hydraulic control one-way valves 2, thereby realizing the lifting of the two five-stage plunger hydraulic cylinders 1. A part of the oil at the outlet of the second check valve 9 passes through the first check valve 8 to provide oil to the control oil port X of the electro-hydraulic reversing valve 6 and the P port of the electromagnetic reversing valve 5. When the electromagnetic reversing valve 5 is energized, the P port of the electromagnetic reversing valve 5 is connected to the A port, and the oil flows into the control oil port X of the two hydraulic control check valves 2, thereby opening the two hydraulic control check valves 2. The oil in the two five-stage plunger hydraulic cylinders 1 can flow into the diverter and collector valves 4 in the opposite direction through the two hydraulic control check valves 2. At this time, the electro-hydraulic reversing valve 6 is energized at the cross position, and the A port of the electro-hydraulic reversing valve 6 is connected to the T port. The oil finally returns to the oil tank through the T port of the electro-hydraulic reversing valve 6, realizing the descent of the five-stage plunger hydraulic cylinder 1. The speed of the two five-stage plunger hydraulic cylinders 1 is roughly controlled by the diverter and collector valve 4, so that their lifting speeds remain basically consistent, achieving a certain degree of synchronous operation. When the two five-stage plunger hydraulic cylinders 1 are out of sync, the dual-axis tilt sensor 13 on the hydraulic flap unloading platform detects the deflection angle of the hydraulic flap unloading platform. The maximum deflection angle of the hydraulic flap unloading platform is plus or minus 0.5 degrees. During the lifting process, the synchronization of the hydraulic flap unloading platform is judged according to the size of the deflection angle, and then fed back to the programmable PLC controller 7. The programmable PLC controller 7 controls the switching frequency of the bypass oil leakage correction valve 3 to form negative feedback to automatically adjust the deflection angle of the hydraulic flap unloading platform, and always keep the deflection angle of the hydraulic flap unloading platform within plus or minus 0.5 degrees. During the lifting or lowering process, the programmable PLC controller 7 performs comparison processing based on the deflection angle signal. When the deflection angle is greater than positive 0.5 degrees, the programmable PLC controller 7 controls the electromagnetic reversing valve 5 to be energized, and its P port is connected to the A port. The pressure oil enters the P port of the electromagnetic reversing valve 5 from the outlet of the first side check valve 8, and flows into the control oil port X port of the hydraulic control check valve 2 through the A port, and pushes the hydraulic control check valve 2. The programmable PLC controller 7 simultaneously turns on the switch of the bypass oil leakage correction valve 3, so that the right electromagnet is energized, the bypass oil leakage correction valve is switched to the parallel position, and its B port is connected to the T port. The oil in the rodless chamber of the five-stage plunger hydraulic cylinder 1 on the right side flows in the reverse direction through the hydraulic control check valve 2 to the B port of the bypass oil leakage correction valve 3, and is discharged back to the oil tank 12 from the T port.When the deflection angle is greater than negative 0.5 degrees, the programmable PLC controller 7 controls the electromagnetic reversing valve 5 to be energized, and its P port is connected to the A port. The pressure oil enters the P port of the electromagnetic reversing valve 5 from the outlet of the first side check valve 8, and flows into the control oil port X port of the hydraulic control check valve 2 through the A port, pushing the hydraulic control check valve 2. The programmable PLC controller 7 simultaneously opens the switch of the bypass oil leakage correction valve 3, so that its left electromagnet is energized, and the bypass oil leakage correction valve is switched to the cross position, and its A port is connected to the T port. The oil in the rodless chamber of the left five-stage plunger hydraulic cylinder 1 flows in the reverse direction through the hydraulic control check valve 2 to the A port of the bypass oil leakage correction valve 3, and is discharged back to the oil tank 12 from the T port. After the programmable PLC controller 7 controls the bypass oil leakage correction valve 3 to discharge oil for 80ms, the switch of the bypass oil leakage correction valve 3 is closed, and its electromagnet loses power, and the bypass oil leakage correction valve 3 returns to the middle position. At this time, if the deflection angle is not corrected to within plus or minus 0.1 degrees, continue the above action until the deflection angle is controlled to within plus or minus 0.1 degrees, stop the correction, and the bypass oil leakage correction valve 3 loses power, thereby achieving the purpose of improving the synchronization accuracy of the two cylinders.

[0018] It should be understood that the parts not elaborated in detail in this specification belong to the prior art. The above embodiments are only descriptions of the preferred implementation methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made by ordinary engineers and technicians in this field to the technical solution of the present invention should fall within the protection scope determined by the claims of the present invention.

Claims

1. A synchronous control device for a hydraulic flap unloading platform, comprising two five-stage plunger hydraulic cylinders and an oil tank connected to the unloading platform, characterized in that The oil tank is connected to the oil pump motor unit, and the oil pump motor unit is connected to the inlet of the second one-way valve and the inlet of the overflow valve through the hydraulic oil pipe; the outlet of the second one-way valve is connected to the P port of the electro-hydraulic reversing valve and the inlet of the first one-way valve respectively, the outlet of the first one-way valve is connected to the control oil port X port of the electro-hydraulic reversing valve and the P port of the electromagnetic reversing valve respectively, and the A port of the electromagnetic reversing valve is connected to the control oil port X port of the two hydraulically controlled one-way valves respectively; the A port of the electro-hydraulic reversing valve is connected to the inlet of the diverter and collector valve, and the two outlets of the diverter and collector valve are connected to the two The inlet of the two hydraulically controlled one-way valves is connected, and the outlets of the two hydraulically controlled one-way valves are respectively connected to the rodless chambers of two five-stage plunger hydraulic cylinders; the A port and B port of the bypass oil leakage correction valve are respectively connected to the inlet of the two hydraulically controlled one-way valves, and the T port of the bypass oil leakage correction valve, the T port of the electro-hydraulic reversing valve and the outlet of the overflow valve are all connected back to the oil tank; a dual-axis inclination sensor is provided on the platform of the hydraulic flap unloading machine, and the dual-axis inclination sensor is connected to the programmable PLC controller, and the programmable PLC controller is connected to the bypass oil leakage correction valve and the electromagnetic reversing valve.

2. A synchronous control method for a hydraulic flap unloading machine platform, characterized in that It specifically includes the following steps: 1) The oil pump motor unit sucks oil from the oil tank, and the oil flows into the overflow valve through the hydraulic oil pipe and then flows into the oil tank to achieve overload protection; the oil flows through the hydraulic oil pipe and the second one-way valve to the P port of the electro-hydraulic reversing valve, and the electro-hydraulic reversing valve is energized in parallel, and the P port of the electro-hydraulic reversing valve is connected to the A port, and the oil is supplied to the flow dividing and collecting valve through the A port of the electro-hydraulic reversing valve, and then enters the two hydraulically controlled one-way valves through the flow dividing and collecting valve, and then enters the rodless chambers of the two five-stage plunger hydraulic cylinders respectively, thereby realizing the lifting of the two five-stage plunger hydraulic cylinders; 2) A part of the oil passes through the second one-way valve and passes through the first one-way valve to provide oil to the control oil port X of the electro-hydraulic reversing valve and the P port of the electromagnetic reversing valve. When the electromagnetic reversing valve is energized, the P port of the electromagnetic reversing valve is connected to the A port, and the oil flows into the control oil port X of the two hydraulic control one-way valves, opening the two hydraulic control one-way valves; the oil in the two five-stage plunger hydraulic cylinders flows into the diverter and collector valves in the opposite direction through the two hydraulic control one-way valves. At this time, the electro-hydraulic reversing valve is energized in the cross position, and the A port of the electro-hydraulic reversing valve is connected to the T port. The oil finally returns to the oil tank through the T port of the electro-hydraulic reversing valve, realizing the descent of the five-stage plunger hydraulic cylinder; the speed of the two five-stage plunger hydraulic cylinders is controlled by the diverter and collector valve, so that their lifting speeds are consistent and synchronous operation is achieved; 3) When the two five-stage plunger hydraulic cylinders are out of sync, the dual-axis inclination sensor on the hydraulic flap unloading platform detects the deflection angle of the hydraulic flap unloading platform. The maximum deflection angle of the hydraulic flap unloading platform is plus or minus 0.5 degrees; 4) During the lifting or lowering process, when the deflection angle is greater than positive 0.5 degrees, the programmable PLC controller controls the electromagnetic reversing valve to be energized, and its P port is connected to A port. The pressure oil enters the P port of the electromagnetic reversing valve from the outlet of the first side check valve, and flows into the control oil port X of the hydraulic control check valve through the A port, pushing open the hydraulic control check valve; the programmable PLC controller simultaneously opens the switch of the bypass oil leakage correction valve, so that the right electromagnet is energized, the bypass oil leakage correction valve is switched to the parallel position, and its B port is connected to the T port. The oil in the rodless chamber of the right five-stage plunger hydraulic cylinder flows in the opposite direction through the hydraulic control check valve to the B port of the bypass oil leakage correction valve, and is discharged back to the oil tank from the T port; 5) When the deflection angle is greater than negative 0.5 degrees, the programmable PLC controller controls the electromagnetic reversing valve to be energized, and its P port is connected to A port. The pressure oil enters the P port of the electromagnetic reversing valve from the outlet of the first side check valve, and flows into the control oil port X port of the hydraulic control check valve through A port, pushing open the hydraulic control check valve; the programmable PLC controller simultaneously turns on the switch of the bypass oil leakage correction valve, so that the electromagnet on its left side is energized, and the bypass oil leakage correction valve is switched to the cross position, and its A port is connected to T port. The oil in the rodless chamber of the left five-stage plunger hydraulic cylinder flows in the opposite direction through the hydraulic control check valve to the A port of the bypass oil leakage correction valve, and is discharged back to the oil tank from T port; 6) After the programmable PLC controller controls the bypass oil leakage correction valve to leak oil for 80ms, the switch of the bypass oil leakage correction valve is closed, the solenoid loses power, and the bypass oil leakage correction valve returns to the middle position; at this time, if the deflection angle is not corrected to within plus or minus 0.1 degrees, continue the above actions until the deflection angle is controlled to within plus or minus 0.1 degrees, stop the correction, and the bypass oil leakage correction valve loses power.

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