A bypass oil passage

Abstract

This invention provides a circuit for cutting off hydraulic oil. When the pressure compensation valve receives hydraulic oil, the pressure compensation valve outputs one hydraulic oil to drive the actuator, and at the same time, the pressure compensation valve outputs another signal oil to conduct a signal amplifier, generating a load signal for the variable pump station. When there is a load, the output feedback signal is quickly generated.

Description

Technical Field

[0001] This invention relates to the field of multi-way valve hydraulics, and more specifically to a shut-off oil circuit. Background Technology

[0002] Various actuators are driven by multi-way valves, which in turn drive the actuators to move in different directions. Chinese patent application No. 201810521144.X, published on October 16, 2018, discloses a three-position, five-way load port independent control multi-way valve with a Y-type center position function. Each section of this valve includes a pressure compensator, two three-position, five-way directional valves, two three-way pressure reducing valves, and a check valve. The component connections in each section are identical, and all sections share a unified inlet oil line P, return oil line T, and load feedback oil line LS. The pressure reducing valves output corresponding pressure to control the opening degree of the two directional valves, thereby controlling the speed and direction of the actuators.

[0003] In this multi-way valve, when the actuator pressure controlled by one of the multi-way valves is not the highest load pressure of the system, the valve core of the pressure compensator is in the neutral position, and the oil port connected to the load oil circuit LS is cut off. As a result, the hydraulic oil cannot transmit the feedback signal through the load oil circuit LS. Thus, when the pressure compensator outputs hydraulic oil, it cannot output the corresponding feedback signal. Summary of the Invention

[0004] This invention provides a method for cutting off an oil circuit and quickly outputting a feedback signal when under load.

[0005] To achieve the above objectives, the technical solution of the present invention is: an oil circuit shut-off device, comprising an oil inlet pipe P, an oil return pipe T, a multi-way valve, a pressure compensation valve, an actuator, and a feedback oil circuit. The oil inlet pipe P is connected to the first end of the multi-way valve and a variable pump station. The oil return pipe T is connected to the first end of the multi-way valve and an oil tank. The variable pump station is connected to the oil tank. The second end of the multi-way valve is connected to the control end and the input end of the pressure compensation valve. The output end of the pressure compensation valve is connected to the first input end of a first shuttle valve and the first end of the multi-way valve. The second end of the multi-way valve is also connected to the actuator.

[0006] When hydraulic oil is input to the pressure compensation valve, the pressure compensation valve connects the multi-way valve and the feedback oil circuit. The pressure compensation valve is also equipped with a first oil port and a second oil port, which are connected to each other. The feedback oil circuit includes the LY feedback oil circuit and the LS feedback oil circuit.

[0007] One end of the LS feedback oil circuit is connected to the first port of the pressure compensation valve, and the other end of the LS feedback oil circuit is connected to the variable pump station.

[0008] One end of the LY feedback oil circuit is connected to the first port of the pressure compensation valve, the other end of the LY feedback oil circuit is connected to the control terminal of the signal amplifier, the input terminal of the signal amplifier is connected to the oil inlet pipeline P, and the output terminal of the signal amplifier is connected to the feedback terminal of the variable pump station.

[0009] In the above hydraulic system, the hydraulic oil output from the variable pump station is input into the inlet line P, then flows through one port of the multi-way valve, then through the pressure compensation valve, and then outputs hydraulic oil from the pressure compensation valve. Part of the hydraulic oil flows into the other port of the multi-way valve and then to the actuator, driving the actuator to move; part of the hydraulic oil flows through the first shuttle valve into the LS feedback circuit, then flows through the first and second ports of the pressure compensation valve into the LY feedback circuit, and then flows to the control terminal of the signal amplifier, making the signal amplifier conduct, and thus the hydraulic oil output from the variable pump station enters the feedback terminal of the variable pump station.

[0010] When the pressure compensation valve receives hydraulic oil, it outputs one hydraulic oil path to drive the actuator, and simultaneously outputs another signal oil path to activate the signal amplifier, generating a load signal to the variable pump station. The variable pump station then increases its hydraulic oil output. As the hydraulic oil output between the variable pump station and the actuator increases, both the oil pressure and flow rate increase, thus shortening the time it takes for the hydraulic oil to travel from the variable pump station to the actuator. This reduces the reaction time between the variable pump station and the actuator, enabling rapid response. Furthermore, it increases the output hydraulic oil volume, allowing the actuator to operate at full load at maximum speed with high reliability.

[0011] In the conduction oil circuit of the multi-way valve, when the control end of the pressure compensator receives hydraulic oil, the input end and output end of the pressure compensator are connected. It is not necessary to consider the pressure of the hydraulic system, so that the output feedback signal can be quickly obtained when there is a load.

[0012] Furthermore, a second check valve is connected between the oil inlet line P and the input terminal of the signal amplifier.

[0013] The above settings, by installing a second check valve, prevent the hydraulic oil output from the inlet line P from flowing back.

[0014] Furthermore, an unloading relief valve is connected between the oil inlet line P and the oil return line T.

[0015] The above settings, by setting an unloading relief valve, allow the hydraulic oil in the inlet line P to flow into the return line T through the unloading relief valve when the actuator stops operating, and then flow into the oil tank.

[0016] Furthermore, the C1 port of the multi-way valve is connected to the oil inlet line P, the D1 port of the multi-way valve is connected to the input and control ends of the pressure compensation valve, the P1 port of the multi-way valve is connected to the input end of the pressure compensation valve, the B1 port of the multi-way valve is connected to one end of the actuator, the A1 port of the multi-way valve is connected to the other end of the actuator, and the T1 port of the multi-way valve is connected to the return line T.

[0017] In the above hydraulic system, the multi-way valve switches in one direction. The hydraulic oil output from the inlet pipe P flows from port C1 of the multi-way valve to port D1, and then flows into the control end of the pressure compensation valve, making the pressure compensation valve open. Then, the hydraulic oil output from port D1 of the multi-way valve is input into the pressure compensation valve. A portion of the hydraulic oil output from the pressure compensation valve passes through the feedback oil circuit conduction signal amplifier, which causes the variable pump to engage and increase the output of the hydraulic oil. At the same time, another portion of the hydraulic oil output from the pressure compensation valve flows through port P1 of the multi-way valve to port B1, and then flows into the actuator to drive the actuator to move in one direction. It also flows from port A1 of the multi-way valve to port T1, increasing the output of the hydraulic oil from the variable pump station, thereby increasing the flow rate and oil pressure of the hydraulic oil input to the winch.

[0018] The multi-way valve reverses in another direction, and another part of the hydraulic pressure output from the pressure compensation valve flows through the P1 port of the multi-way valve to the A1 port of the multi-way valve. Then, after the first relief valve is opened, it flows to the actuator to drive the actuator to move in another direction, and then flows from the B1 port of the multi-way valve to the T1 port of the multi-way valve. Attached Figure Description

[0019] Figure 1 This is a hydraulic schematic diagram of the oil supply to the actuator of the present invention.

[0020] Figure 2 for Figure 1 A magnified view of the Z-axis. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] like Figure 1-2 As shown, a shut-off oil circuit includes an inlet oil line P, a return oil line T, a multi-way valve 1, a pressure compensation valve 2, and a feedback oil circuit. The inlet oil line P connects the first end of the multi-way valve 1 to a variable displacement pump station (not shown in the figure). The return oil line T connects the first end of the multi-way valve 1 to an oil tank (not shown in the figure). The variable displacement pump station is connected to the oil tank. The second end of the multi-way valve 1 is connected to the control end 23 and the input end 24 of the pressure compensation valve. The output end 25 of the pressure compensation valve is connected to the first input end of the first shuttle valve 5 and the first end of the multi-way valve 1. The second end of the multi-way valve 1 is also connected to an actuator 3. The actuator 3 can be a winch or a hydraulic cylinder; in this embodiment, the actuator 3 is a winch.

[0023] When hydraulic oil is input to pressure compensation valve 2, pressure compensation valve 2 connects multi-way valve 1 and feedback oil circuit. Pressure compensation valve 2 is also provided with first oil port 21 and second oil port 22, and first oil port 21 and second oil port 22 are connected. The feedback oil circuit includes LY feedback oil circuit and LS feedback oil circuit.

[0024] One end of the LS feedback oil circuit is connected to the first oil port 21 of the pressure compensation valve 2, and the other end of the LS feedback oil circuit is connected to the variable pump station.

[0025] One end of the LY feedback oil circuit is connected to the second oil port 22 of the pressure compensation valve 2, and the other end of the LY feedback oil circuit is connected to the control terminal of the signal amplifier 4. The input terminal of the signal amplifier 4 is connected to the oil inlet pipeline P, and the output terminal of the signal amplifier 4 is connected to the feedback terminal of the variable pump station.

[0026] In the above hydraulic system, the hydraulic oil output from the variable pump station is input into the inlet pipeline P, then flows through one port of the multi-way valve 1, then through the pressure compensation valve 2, and then outputs hydraulic oil from the pressure compensation valve 2. Part of the hydraulic oil flows into the other port of the multi-way valve 1 and then to the actuator 3, driving the actuator 3 to move. Part of the hydraulic oil flows into the LS feedback oil circuit through the first shuttle valve 5, then flows through the first port 21 and the second port 22 of the pressure compensation valve 2 into the LY feedback oil circuit, and then flows to the control terminal of the signal amplifier 4, making the signal amplifier 4 conduct, and then the hydraulic oil output from the output terminal of the variable pump station enters the feedback terminal of the variable pump station.

[0027] When pressure compensation valve 2 receives hydraulic oil, it outputs one path of hydraulic oil to drive actuator 3, and simultaneously outputs another path of signal oil to activate signal amplifier 4, generating a load signal to the variable pump station. The variable pump station increases the output of hydraulic oil. As the output of hydraulic oil between the variable pump station and actuator 3 increases, both the oil pressure and flow rate of the hydraulic oil increase. Consequently, the time it takes for hydraulic oil to be delivered from the variable pump station to actuator 3 is shortened, reducing the reaction time between the variable pump station and actuator 3. This achieves rapid response between the variable pump station and actuator 3. At the same time, it increases the displacement of the output hydraulic oil, enabling actuator 3 to operate at full load at maximum speed with high reliability.

[0028] In this embodiment, the initial output flow rate and the load output flow rate of the hydraulic oil are set, and the load output flow rate is greater than the initial output flow rate. When the variable pump station starts, the flow rate of the hydraulic oil output by the variable pump station is the initial output flow rate. After the feedback signal is input to the feedback terminal of the variable pump station through the signal amplifier, the flow rate of the hydraulic oil output by the variable pump station is the load output flow rate.

[0029] In the conduction oil circuit of multi-way valve 1, when the control end of the pressure compensator receives hydraulic oil, the input end and output end of the pressure compensator are connected. It is not necessary to consider the pressure of the hydraulic system, so that the output feedback signal can be quickly obtained when there is a load.

[0030] Specifically, port C1 of multi-way valve 1 is connected to the inlet oil line P, port D1 of multi-way valve 1 is connected to the input and control ends of pressure compensation valve 2, port P1 of multi-way valve 1 is connected to the input end of pressure compensation valve 2, port B1 of multi-way valve 1 is connected to one end of actuator 3, port A1 of multi-way valve 1 is connected to the other end of actuator 3, and port T1 of multi-way valve 1 is connected to the return oil line T. When the multi-way valve 1 switches in one direction, the hydraulic oil output from the inlet pipe P flows from port C1 of the multi-way valve 1 to port D1 of the multi-way valve 1, and then flows into the control terminal 23 of the pressure compensation valve, causing the pressure compensation valve 2 to be turned on. Then, the hydraulic oil output from port D1 of the multi-way valve 1 is input into the pressure compensation valve 2. A portion of the hydraulic oil output from the pressure compensation valve 2 passes through the feedback oil circuit conduction signal amplifier, causing the variable pump to be turned on and increasing the output of the hydraulic oil. At the same time, another portion of the hydraulic oil output from the pressure compensation valve 2 flows through port P1 of the multi-way valve 1 to port B1 of the multi-way valve 1, and then flows into the actuator 3 to drive the actuator 3 to move in one direction. It also flows from port A1 of the multi-way valve 1 to port T1 of the multi-way valve 1, increasing the output of the hydraulic oil from the variable pump station, thereby increasing the flow rate and oil pressure of the hydraulic oil input to the winch 31.

[0031] The multi-way valve 1 reverses direction, and another part of the hydraulic pressure output from the pressure compensation valve 2 flows through the P1 port of the multi-way valve 1 to the A1 port of the multi-way valve 1. Then, after the first relief valve 32 is opened, it flows to the actuator 3 to drive the actuator 3 to move in another direction. Then, it flows from the B1 port of the multi-way valve 1 to the T1 port of the multi-way valve 1.

[0032] In this embodiment, a second check valve 6 is connected between the oil inlet pipe P and the input terminal of the signal amplifier 4. By setting the second check valve 6, the hydraulic oil output from the oil inlet pipe P is prevented from flowing back. An unloading relief valve 7 is also connected between the oil inlet pipe P and the return pipe T. When the actuator 3 stops operating, the unloading relief valve 7 is opened to unload the hydraulic oil, so that the hydraulic oil in the oil inlet pipe P flows into the return pipe T through the unloading relief valve and then flows into the oil tank.

Claims

1. A bypass passage including an oil inlet line P, an oil return line T, a multi-way valve, a pressure compensating valve, and a feedback oil line, characterized by: The oil inlet line P connects the first end of the multi-way valve to the variable pump station, the oil return line T connects the first end of the multi-way valve to the oil tank, the variable pump station is connected to the oil tank, the second end of the multi-way valve is connected to the control end and input end of the pressure compensation valve, the output end of the pressure compensation valve is connected to the first input end of the first shuttle valve and the first end of the multi-way valve, and the second end of the multi-way valve is also connected to the actuator. When hydraulic oil is input to the pressure compensation valve, the pressure compensation valve connects the multi-way valve and the feedback oil circuit. The pressure compensation valve is also provided with a first oil port and a second oil port, which are connected to the second oil port. The feedback oil circuit includes the LY feedback oil circuit and the LS feedback oil circuit. One end of the LS feedback oil circuit is connected to the first oil port of the pressure compensation valve, and the other end of the LS feedback oil circuit is connected to the variable pump station. One end of the LY feedback oil circuit is connected to the second oil port of the pressure compensation valve, the other end of the LY feedback oil circuit is connected to the control terminal of the signal amplifier, the input terminal of the signal amplifier is connected to the oil inlet pipeline P, and the output terminal of the signal amplifier is connected to the feedback terminal of the variable pump station. The C1 port of the multi-way valve is connected to the inlet oil line P, the D1 port of the multi-way valve is connected to the input and control ends of the pressure compensation valve, the P1 port of the multi-way valve is connected to the input end of the pressure compensation valve, the B1 port of the multi-way valve is connected to one end of the actuator, the A1 port of the multi-way valve is connected to the other end of the actuator, and the T1 port of the multi-way valve is connected to the return oil line T.

2. A by-pass passage according to claim 1, characterized in that: A second check valve is connected between the oil inlet line P and the input terminal of the signal amplifier.

3. A by-pass passage according to claim 1, characterized in that: An unloading relief valve is also connected between the oil inlet line P and the oil return line T.

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