Unloading loop control system

Abstract

The invention discloses an unloading loop control system, which belongs to the field of control systems and comprises a two-way hydraulic control one-way valve, an electromagnetic proportional reversing valve, a manual reversing valve, a shuttle valve, a one-way throttle valve, a hydraulic control reversing valve and an electric control functional component. Wherein the two-way hydraulic control one-way valve comprises a first hydraulic control one-way valve and a second hydraulic control one-way valve; the first hydraulic control one-way valve is communicated with the shuttle valve; the shuttle valve is communicated with the electromagnetic proportional reversing valve; the second hydraulic control one-way valve is communicated with the hand-operated direction valve; the one-way throttle valve is used for adjusting the initial back pressure of the system and the pressure for opening the hydraulic control reversing valve; the shuttle valve is used for driving the left working position and the right working position of the electromagnetic proportional reversing valve and transmitting pressure oil to a control port of the hydraulic control reversing valve. When the manual reversing valve and the electromagnetic proportional reversing valve are in the original state, the bidirectional hydraulic control one-way valve ensures that the oil inlet and the oil return port are in the pressure maintaining state, high-pressure impact of the internal oil port can be avoided, and the service life of the valve is prolonged.

Description

Technical Field

[0001] This invention relates to the field of control system technology, and in particular to an unloading loop control system. Background Technology

[0002] Because proportional valves are expensive and servo valves need to have a long service life, there is an urgent need for a way to ensure the service life of valve components. Summary of the Invention

[0003] The purpose of this invention is to provide an unloading circuit control system to solve the problems in the prior art. This invention ensures a preset pressure at the oil inlet during the switching process of the proportional directional valve, preventing shock startup.

[0004] To solve the above-mentioned technical problems, the present invention provides an unloading loop control system, comprising:

[0005] Two-way hydraulic control check valve, electromagnetic proportional directional valve, manual directional valve, shuttle valve, one-way throttle valve, hydraulic control directional valve and electrically controlled functional components; wherein the two-way hydraulic control check valve includes a first hydraulic control check valve and a second hydraulic control check valve.

[0006] The first hydraulically controlled check valve is connected to the shuttle valve, and the shuttle valve is connected to the electromagnetic proportional directional valve; the second hydraulically controlled check valve is connected to the manual directional valve.

[0007] The one-way throttle valve is used to adjust the initial back pressure of the system and the pressure required to open the hydraulically controlled directional valve.

[0008] The shuttle valve is used to drive the electromagnetic proportional directional valve to its left and right working positions, and to transmit the pressure oil to the control port of the hydraulic directional valve.

[0009] When the manual directional valve and the electromagnetic proportional directional valve are in their original states, the bidirectional hydraulic check valve ensures that the oil inlet and return ports are in a pressure-holding state.

[0010] In one embodiment, under initial unloading conditions, the system receives oil through port P, which connects the hydraulic directional valve and the electromagnetic proportional directional valve, and returns the oil to port T via the hydraulic directional valve and the one-way throttle valve. The opening size of the one-way throttle valve is adjusted, and port P is preset to be at a preset pressure in this state to prevent high-pressure impact on the internal oil port when the electromagnetic proportional directional valve switches.

[0011] In one embodiment, during operation, the system receives oil through the P port connecting the hydraulic directional valve and the electromagnetic proportional directional valve, with an initial preset pressure. When the left side of the electromagnetic proportional directional valve is energized, an analog signal is provided, and hydraulic oil enters the right oil circuit. The control hydraulic oil then passes through the shuttle valve to the control port of the hydraulic directional valve, driving the valve to switch its operating position. At this time, the hydraulic directional valve cuts off the inlet and the one-way throttle valve, remaining in a closed state with no unloading function. The hydraulic oil entering the right oil circuit of the hydraulic directional valve returns to the return port, driving the relevant actuators to operate.

[0012] In one implementation, if the system malfunctions, oil is added to port P1 of the manual directional valve via a mobile pump station, and the working position of the manual directional valve is manually switched to achieve the function of controlling the oil entering the corresponding port of the actuator.

[0013] The present invention provides an unloading circuit control system that can avoid high pressure impact on internal oil ports and extend the service life of valve components. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the unloading circuit control system provided by the present invention. Detailed Implementation

[0015] The unloading loop control system proposed in this invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of this invention will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise scales, and are only used to facilitate and clarify the illustration of the embodiments of this invention.

[0016] This invention provides an unloading circuit control system, which consists of an electromagnetic proportional directional valve 3, a manual directional valve 4, a bidirectional hydraulic control check valve (including hydraulic control check valve 1.1 and hydraulic control check valve 1.2), a shuttle valve 2, a one-way throttle valve 5, a hydraulic control directional valve 6, and electronic control functional components.

[0017] Initial unloading state: The system receives oil from port P, which returns to port T via hydraulic directional valve 6 and one-way throttle valve 5. The opening size of one-way throttle valve 5 is adjusted. In this state, port P is preset to a preset pressure to prevent high pressure impact on the internal oil port when the electromagnetic proportional directional valve 3 switches.

[0018] Operating status: The system receives oil from port P, which has an initial preset pressure. When the left side of the electromagnetic proportional directional valve 3 is energized, an analog signal is provided, and hydraulic oil enters the right oil circuit. Then, through shuttle valve 2, the control hydraulic oil is introduced into the control port of the hydraulic directional valve 6, driving the hydraulic directional valve 6 to switch its operating position. At this time, the hydraulic directional valve 6 cuts off the inlet and the one-way throttle valve 5; this state is closed and has no unloading function. The hydraulic oil entering the right oil circuit of the hydraulic directional valve 6 enters the return port, driving the relevant actuators to operate.

[0019] The electromagnetic proportional directional valve 3 supplies signals on the right side in the same principle as the left side, and its function is as described above, so it will not be repeated here.

[0020] Manual function: When the system malfunctions, the oil in port P1 can be added by moving the pump station, and the working position of the manual directional valve 4 can be manually switched to control the oil entering the corresponding port of the actuator.

[0021] The one-way throttle valve 5 is used to adjust the initial back pressure of the system and the pressure required to open the hydraulic control directional valve 6.

[0022] When the shuttle valve 2 is used in both the left and right working positions of the electromagnetic proportional directional valve 3, it can transmit pressure oil to the control port of the hydraulic directional valve 6.

[0023] The bidirectional hydraulic check valve ensures that the oil inlet and return ports are in a pressure-holding state when the manual directional valve 4 and the electromagnetic proportional directional valve 3 are in their original states.

[0024] The above description is merely a description of preferred embodiments of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. An unloading circuit control system characterized by comprising: Comprise: Bidirectional hydraulic control check valve, electromagnetic proportional directional valve, manual directional valve, shuttle valve, one-way throttle valve, hydraulic control directional valve and electric control function components; wherein the bidirectional hydraulic control check valve comprises a first hydraulic control check valve and a second hydraulic control check valve; The first hydraulic control check valve is in communication with the shuttle valve, and the shuttle valve is in communication with the electromagnetic proportional directional valve; the second hydraulic control check valve is in communication with the manual directional valve; The one-way throttle valve is used to adjust the initial back pressure of the system and the pressure for opening the hydraulic control directional valve; The shuttle valve is used to drive the electromagnetic proportional directional valve to the left and right two working positions, and to transmit the pressure oil to the control port of the hydraulic control directional valve; When the manual directional valve and the electromagnetic proportional directional valve are in the original state, the bidirectional hydraulic control check valve ensures that the oil inlet and the oil return port are in a pressure maintaining state.

2. The unloading circuit control system according to claim 1, characterized by, In the initial unloading state, the system is supplied with oil through the P port of the connected hydraulic control directional valve and electromagnetic proportional directional valve, and returns to the T port through the hydraulic control directional valve and the one-way throttle valve; the opening size of the one-way throttle valve is adjusted, and the P port is preset to a preset pressure in this state to prevent high pressure impact on the internal oil port of the electromagnetic proportional directional valve when switching.

3. The unloading circuit control system of claim 1, wherein In the working state, the system is supplied with oil through the P port of the connected hydraulic control directional valve and electromagnetic proportional directional valve; in this state, there is an initial preset pressure, and when the electromagnetic proportional directional valve is powered on at the left side, an analog signal is given, hydraulic oil enters the right oil way, and then the control hydraulic oil is introduced into the control port of the hydraulic control directional valve through the shuttle valve to drive the hydraulic control directional valve to act and switch the working position; at this time, the hydraulic control directional valve cuts off the inlet and the one-way throttle valve, and the state is in a closed state without unloading function; the hydraulic oil entering the right oil way of the hydraulic control directional valve enters the oil return port to drive the related actuator to act.

4. The unloading circuit control system of claim 1, wherein When the system function fails, the P1 port connected with the manual directional valve is supplied with oil by moving the pump station, the working position of the manual directional valve is manually switched, and the function of controlling the oil inlet into the corresponding oil port of the actuator is achieved.

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