An electro-hydraulic control multi-way valve and its control method

Abstract

The present invention provides an electro-hydraulic control multi-way valve and its control method, which includes several hydraulic integrated valve blocks. A control signal is sent to each of the hydraulic integrated valve blocks through a controller to realize the control of the hydraulic integrated valve blocks over different hydraulic actuators. A feedforward-feedback composite control method is adopted to control several proportional flow control valves and several two-position two-way proportional solenoid valves in the hydraulic integrated valve blocks in real time, which can realize the extension and retraction control of a double-acting hydraulic cylinder under the main and passive working conditions, solve the problem that when the traditional load port independent control system encounters the compound movement of multiple hydraulic actuators, it is difficult to recalculate the flow rate of each hydraulic actuator and perform flow rate distribution, and the control method has hysteresis, realizes the independent control of the inlet and outlet valves, effectively reduces the throttling loss at the valve port, and realizes the flow regeneration function.

Description

Technical Field

[0001] The present invention relates to the technical field of electro-hydraulic control, and particularly relates to an electro-hydraulic control multi-way valve and a control method thereof. Background Art

[0002] Electro-hydraulic control multi-way valves have been widely used in the fields of construction machinery and the like due to their characteristics such as compact structure, small pressure loss, multi-position function, and simple manufacturing. Electro-hydraulic control multi-way valves are the most important components in electro-hydraulic control technology, and their function is to continuously control the direction, pressure, and flow rate of fluid flow. The excellent performance of electro-hydraulic control multi-way valves directly affects the use performance of mechanical equipment.

[0003] Traditional multi-way valves are usually multi-way linkage valves, with throttling at both the inlet and outlet simultaneously. At the same time, they can only control the pressure and flow rate of a single actuator, and the controllability is relatively poor. Moreover, there are problems such as throttling loss and low efficiency. In particular, it is very difficult to control the pressure and flow rate of the two chambers of the hydraulic actuator under active load conditions and passive load conditions, resulting in huge energy consumption and poor control performance.

[0004] Currently, for the key problems existing in traditional multi-way valves, the existing solution is to adjust the pressure and flow rate of hydraulic actuator components by adding a pressure compensator. Although the pressure compensating valve can effectively control the inlet and outlet flow rate and pressure of the valve without being affected by the load pressure, the actual fluid passing through the valve will cause energy consumption. Therefore, we have made improvements and proposed an electro-hydraulic control multi-way valve. The present invention uses a two-position two-way proportional solenoid valve and a proportional flow control valve to independently control the inlet and outlet flow rate and pressure of the valve, can achieve the function of flow regeneration, reduce the pressure loss of the system, and has characteristics such as good controllability and compact structure. Summary of the Invention

[0005] An electro-hydraulic control multi-way valve disclosed by the present invention solves the problem that when the traditional load port independent control system encounters the compound movement of multiple hydraulic actuators, it is difficult to calculate the flow rate of each hydraulic actuator again and perform flow rate distribution, and the control method has large difficulty and hysteresis. It realizes the independent control of the inlet and outlet valves, effectively reduces the throttling loss at the valve port, and realizes the function of flow regeneration.

[0006] To achieve the above object, the technical solution of the present invention is specifically realized as follows:

[0007] On the one hand, the present invention discloses an electro-hydraulic control multi-way valve, including a plurality of hydraulic integrated valve blocks, and a controller sends control signals to each of the hydraulic integrated valve blocks to realize the control of different hydraulic actuators by the hydraulic integrated valve blocks.

[0008] Further, the hydraulic integrated valve block includes a first proportional flow control valve, a second proportional flow control valve, a third proportional flow control valve, a fourth proportional flow control valve, a first two-position two-way proportional solenoid valve, a second two-position two-way proportional solenoid valve, a third two-position two-way proportional solenoid valve, a fourth two-position two-way proportional solenoid valve, a fifth two-position two-way proportional solenoid valve, a first oil port connector, a second oil port connector, a first pressure sensor, a second pressure sensor, a third pressure sensor, and a fourth pressure sensor. The first proportional flow control valve, the second proportional flow control valve, the third proportional flow control valve, and the fourth proportional flow control valve are installed on one side of the hydraulic integrated valve block. The first two-position two-way proportional solenoid valve, the second two-position two-way proportional solenoid valve, the third two-position two-way proportional solenoid valve, the fourth two-position two-way proportional solenoid valve, and the fifth two-position two-way proportional solenoid valve are installed on the side of the hydraulic integrated valve block opposite to the first proportional flow control valve, the second proportional flow control valve, the third proportional flow control valve, and the fourth proportional flow control valve. The first oil port connector and the second oil port connector are installed above the hydraulic integrated valve block. The first pressure sensor and the second pressure sensor are installed on the same side as the first proportional flow control valve, the second proportional flow control valve, the third proportional flow control valve, and the fourth proportional flow control valve. The third pressure sensor and the fourth pressure sensor are installed on the same side as the first two-position two-way proportional solenoid valve, the second two-position two-way proportional solenoid valve, the third two-position two-way proportional solenoid valve, the fourth two-position two-way proportional solenoid valve, and the fifth two-position two-way proportional solenoid valve. The hydraulic integrated valve block is cast with a first oil inlet P1 and a second oil inlet P2 that are interconnected, a first oil outlet T1 and a second oil outlet T2 that are interconnected, a first working oil port A, a second working oil port B, a monitoring pressure oil port Mp, a monitoring pressure oil port Mt, a monitoring pressure oil port Ma, and a monitoring oil port Mb. The first pressure sensor is connected to the first oil inlet P1, the second pressure sensor is connected to the first working oil port A, the third pressure sensor is connected to the second working oil port B, and the fourth pressure sensor is connected to the first oil outlet T1.

[0009] Further, an electro-hydraulic control multi-way valve includes three hydraulic integrated valve blocks.

[0010] Further, the first proportional flow control valve, the second proportional flow control valve, the third proportional flow control valve, and the fourth proportional flow control valve are installed on one side of the hydraulic integrated valve block by means of cartridge mounting.

[0011] Further, the first two-position two-way proportional solenoid valve, the second two-position two-way proportional solenoid valve, the third two-position two-way proportional solenoid valve, the fourth two-position two-way proportional solenoid valve, and the fifth two-position two-way proportional solenoid valve are installed on the hydraulic integrated valve block by means of cartridge mounting.

[0012] Further, the first oil port joint and the second oil port joint are installed above the hydraulic integrated valve block by means of threaded connection.

[0013] Further, the first pressure sensor and the second pressure sensor are installed on the same side as the first proportional flow control valve, the second proportional flow control valve, the third proportional flow control valve, and the fourth proportional flow control valve by means of threaded connection; the third pressure sensor and the fourth pressure sensor are installed on the same side as the first two-position two-way proportional solenoid valve, the second two-position two-way proportional solenoid valve, the third two-position two-way proportional solenoid valve, the fourth two-position two-way proportional solenoid valve, and the fifth two-position two-way proportional solenoid valve by means of threaded connection.

[0014] Further, the inlet of the first proportional flow control valve is connected to the first oil inlet P1 and the second oil inlet P2, and the outlet of the first proportional flow control valve is connected to the first working oil port A; the inlet of the second proportional flow control valve is connected to the first oil outlet T1 and the second oil outlet T2, and the outlet of the second proportional flow control valve is connected to the first working oil port A; the inlet of the third proportional flow control valve is connected to the first oil inlet P1 and the second oil inlet P2, and the outlet of the third proportional flow control valve is connected to the second working oil port B; the inlet of the fourth proportional flow control valve is connected to the first oil outlet T1 and the second oil outlet T2, and the outlet of the fourth proportional flow control valve is connected to the second working oil port B; the inlet of the first two-position two-way proportional solenoid valve is connected to the first working oil port A, and the outlet of the first two-position two-way proportional solenoid valve is connected to the second working oil port B; the inlet of the second two-position two-way proportional solenoid valve is connected to the first oil inlet P1 and the second oil inlet P2, and the outlet of the second two-position two-way proportional solenoid valve is connected to the first working oil port A; the inlet of the third two-position two-way proportional solenoid valve is connected to the first oil outlet T1 and the second oil outlet T2, and the outlet of the third two-position two-way proportional solenoid valve is connected to the first working oil port A; the inlet of the fourth two-position two-way proportional solenoid valve is connected to the first oil inlet P1 and the second oil inlet P2, and the outlet of the fourth two-position two-way proportional solenoid valve is connected to the second working oil port B; the inlet of the fifth two-position two-way proportional solenoid valve is connected to the first oil outlet T1 and the second oil outlet T2, and the outlet of the fifth two-position two-way proportional solenoid valve is connected to the second working oil port B; the inlet of the first proportional flow control valve is connected to the inlet of the second two-position two-way proportional solenoid valve, and the outlet of the first proportional flow control valve is connected to the outlet of the second two-position two-way proportional solenoid valve; the inlet of the second proportional flow control valve is connected to the inlet of the third two-position two-way proportional solenoid valve, and the outlet of the second proportional flow control valve is connected to the outlet of the third two-position two-way proportional solenoid valve; the inlet of the third proportional flow control valve is connected to the inlet of the fourth two-position two-way proportional solenoid valve, and the outlet of the third proportional flow control valve is connected to the outlet of the fourth two-position two-way proportional solenoid valve; the inlet of the fourth proportional flow control valve is connected to the inlet of the fifth two-position two-way proportional solenoid valve, and the outlet of the fourth proportional flow control valve is connected to the outlet of the fifth two-position two-way proportional solenoid valve; and the first pressure sensor is connected to the first oil inlet P1, the second pressure sensor is connected to the first working oil port A, the third pressure sensor is connected to the second working oil port B, and the fourth pressure sensor is connected to the first oil outlet T1.

[0015] On the other hand, the present invention discloses a control method for an electro-hydraulic control multi-way valve, including the following steps:

[0016] Step 1: Start. The automatic control system of the electro-hydraulic control multi-way valve starts.

[0017] Step 2: Initialize. Initialize the automatic control system of the electro-hydraulic control multi-way valve.

[0018] Step 3: Data acquisition. The controller controls the first pressure sensor, the second pressure sensor, the third pressure sensor, and the fourth pressure sensor to collect relevant signals through the operation buttons on the operation box, and then proceeds to the next step;

[0019] Step 4: Judgment of active and passive working conditions. If the system is in the active working condition, execute Step 5.1; if the system is in the passive working condition, execute 5.2;

[0020] Step 5.1: When the system is judged to be in the active working condition, the hydraulic oil flows from the pump source through the internal pipeline from the oil inlet P 1 into the first flow control valve and the second two-position two-way proportional solenoid valve. At this time, the valve ports of the first flow control valve and the second two-position two-way proportional solenoid valve are fully open. Then the hydraulic oil enters the rodless cavity of the hydraulic cylinder, and the hydraulic oil in the rod cavity passes through the third specific flow control valve and the fourth two-position two-way proportional solenoid valve and enters the fuel tank. At this time, the valve ports of the third specific flow control valve and the fourth two-position two-way proportional solenoid valve are adjusted proportionally for speed regulation, and the hydraulic oil in the rod cavity flows into the rodless cavity through the first two-position two-way proportional solenoid valve to achieve flow regeneration;

[0021] Step 5.2: When the system is judged to be in the passive working condition, at this time, the hydraulic oil flows from the pump source through the internal pipeline from the oil inlet P 1 into the fourth flow control valve and the fifth two-position two-way proportional solenoid valve. At this time, the valve ports of the fourth flow control valve and the fifth two-position two-way proportional solenoid valve are adjusted proportionally for speed regulation. Then the hydraulic oil enters the rod cavity of the hydraulic cylinder, and the hydraulic oil in the rodless cavity passes through the second specific flow control valve and the third two-position two-way proportional solenoid valve and enters the fuel tank. At this time, the valve ports of the second specific flow control valve and the third two-position two-way proportional solenoid valve are fully open to achieve the movement in the passive working condition;

[0022] Step 6: The automatic control of the movement of the main and passive working hydraulic cylinders is completed, and the control is stopped.

[0023] Beneficial technical effects:

[0024] 1. The present invention discloses an electro-hydraulic control multi-way valve, which includes a plurality of hydraulic integrated valve blocks. The controller sends control signals to each of the hydraulic integrated valve blocks to realize the control of the hydraulic integrated valve blocks on different hydraulic actuators, solving the problem that when the traditional load port independent control system encounters the combined movement of multiple hydraulic actuators, it is difficult to recalculate the flow rate of each hydraulic actuator and perform flow distribution control method, and has hysteresis. It realizes the independent control of the inlet and outlet valves, effectively reduces the throttling loss at the valve port, and realizes the flow regeneration function;

[0025] 2. In the present invention, the hydraulic integrated valve block includes a first proportional flow control valve, a second proportional flow control valve, a third proportional flow control valve, a fourth proportional flow control valve, a first two-position two-way proportional solenoid valve, a second two-position two-way proportional solenoid valve, a third two-position two-way proportional solenoid valve, a fourth two-position two-way proportional solenoid valve, and a fifth two-position two-way proportional solenoid valve. The flow rate and pressure of the inlet and outlet ports are controlled by four proportional flow control valves and four two-position two-way proportional solenoid valves. By adjusting the opening degrees of the four proportional flow control valves and the four two-position two-way proportional solenoid valves, independent control of the inlet and outlet valves can be achieved, thereby effectively reducing the throttling loss at the valve ports.

[0026] 3. In the present invention, the hydraulic integrated valve block includes a first proportional flow control valve. By performing logical control on the first two-position two-way proportional solenoid valve, the flow regeneration function is achieved.

[0027] 4. The electro-hydraulic control multi-way valve in the present invention can correspondingly increase the number of hydraulic integrated valve blocks according to the number of hydraulic actuators. An electrical signal is sent to each independent control valve by the controller to achieve the control of each hydraulic actuator by each independent control valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the present invention, the drawings required for the description of the embodiments will be briefly introduced below.

[0029] Figure 1 It is a schematic diagram of the overall structure of an electro-hydraulic control multi-way valve according to an embodiment of the present invention;

[0030] Figure 2 It is an exploded view of the hydraulic integrated valve block in an electro-hydraulic control multi-way valve according to an embodiment of the present invention;

[0031] Figure 3 It is an internal flow path diagram of the hydraulic integrated valve block in an electro-hydraulic control multi-way valve according to an embodiment of the present invention;

[0032] Figure 4 It is a schematic diagram of the hydraulic system principle of the hydraulic integrated valve block in an electro-hydraulic control multi-way valve according to an embodiment of the present invention;

[0033] Figure 5 It is a schematic diagram of the principle of the piston rod extension of the active load force in an electro-hydraulic control multi-way valve according to an embodiment of the present invention;

[0034] Figure 6 It is a schematic diagram of the principle of the piston rod extension of the passive load force in an electro-hydraulic control multi-way valve according to an embodiment of the present invention;

[0035] Figure 7 It is a schematic diagram of the control flow of a control method of an electro-hydraulic control multi-way valve according to an embodiment of the present invention.

[0036] Among them, 1 is a hydraulic integrated valve block, 11 is a first proportional flow control valve, 12 is a second proportional flow control valve, 13 is a third proportional flow control valve, 14 is a fourth proportional flow control valve, 15 is a first two-position two-way proportional solenoid valve, 16 is a second two-position two-way proportional solenoid valve, 17 is a third two-position two-way proportional solenoid valve, 18 is a fourth two-position two-way proportional solenoid valve, 19 is a fifth two-position two-way proportional solenoid valve, 1a is a first oil port joint, 1b is a second oil port joint, 1c is a first pressure sensor, 1d is a second pressure sensor, 1e is a third pressure sensor, 1f is a fourth pressure sensor, 2 is a second hydraulic integrated valve block, 3 is a third hydraulic integrated valve block, 4 is a controller, 5 is an operation box, and 6 is a display. Specific embodiments

[0037] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0038] The embodiments of the present invention will be described in detail below in conjunction with the drawings.

[0039] On the one hand, the present invention discloses an electro-hydraulic control multi-way valve. Refer to Figure 1 , which includes several hydraulic integrated valve blocks 1. The controller sends control signals to each of the hydraulic integrated valve blocks 1 to realize the control of the hydraulic integrated valve blocks 1 over different hydraulic actuators. In the embodiments of the present invention, there are three hydraulic integrated valve blocks 1. Of course, it can be understood that the number of hydraulic integrated valve blocks 1 can be increased according to the number of actuators, and the structures of each hydraulic integrated valve block are exactly the same.

[0040] As an embodiment of the present invention, the hydraulic integrated valve block 1 includes a first proportional flow control valve 11, a second proportional flow control valve 12, a third proportional flow control valve 13, a fourth proportional flow control valve 14, a first two-position two-way proportional solenoid valve 15, a second two-position two-way proportional solenoid valve 16, a third two-position two-way proportional solenoid valve 17, a fourth two-position two-way proportional solenoid valve 18, a fifth two-position two-way proportional solenoid valve 19, a first oil port joint 1a, a second oil port joint 1b, a first pressure sensor 1c, a second pressure sensor 1d, a third pressure sensor 1e, and a fourth pressure sensor 1f. Refer to Figure 2, specifically, the first proportional flow control valve 11, the second proportional flow control valve 12, the third proportional flow control valve 13, and the fourth proportional flow control valve 14 are installed on one side of the hydraulic integrated valve block 1. Preferably, the first proportional flow control valve 11, the second proportional flow control valve 12, the third proportional flow control valve 13, and the fourth proportional flow control valve 14 are installed on one side of the hydraulic integrated valve block 1 by the cartridge insertion method; the first two-position two-way proportional solenoid valve 15, the second two-position two-way proportional solenoid valve 16, the third two-position two-way proportional solenoid valve 17, the fourth two-position two-way proportional solenoid valve 18, and the fifth two-position two-way proportional solenoid valve 19 are installed on the side of the hydraulic integrated valve block 1 opposite to the first proportional flow control valve 11, the second proportional flow control valve 12, the third proportional flow control valve 13, and the fourth proportional flow control valve 14. Preferably, the first two-position two-way proportional solenoid valve 15, the second two-position two-way proportional solenoid valve 16, the third two-position two-way proportional solenoid valve 17, the fourth two-position two-way proportional solenoid valve 18, and the fifth two-position two-way proportional solenoid valve 19 are installed on the side of the hydraulic integrated valve block 1 opposite to the first proportional flow control valve 11, the second proportional flow control valve 12, the third proportional flow control valve 13, and the fourth proportional flow control valve 14 by the cartridge insertion method; the first oil port joint 1a and the second oil port joint 1b are installed above the hydraulic integrated valve block 1. Preferably, the first oil port joint 1a and the second oil port joint 1b are installed above the hydraulic integrated valve block 1 by means of threaded connection; the first pressure sensor 1c and the second pressure sensor 1d are installed on the same side as the first proportional flow control valve 11, the second proportional flow control valve 12, the third proportional flow control valve 13, and the fourth proportional flow control valve 14. Preferably, the first pressure sensor 1c and the second pressure sensor 1d are installed on the same side as the first proportional flow control valve 11, the second proportional flow control valve 12, the third proportional flow control valve 13, and the fourth proportional flow control valve 14; the third pressure sensor 1e and the fourth pressure sensor 1f are installed on the same side as the first two-position two-way proportional solenoid valve 15, the second two-position two-way proportional solenoid valve 16, the third two-position two-way proportional solenoid valve 17, the fourth two-position two-way proportional solenoid valve 18, and the fifth two-position two-way proportional solenoid valve 19. Preferably, the third pressure sensor 1e and the fourth pressure sensor 1f are installed on the same side as the first two-position two-way proportional solenoid valve 15, the second two-position two-way proportional solenoid valve 16, the third two-position two-way proportional solenoid valve 17, the fourth two-position two-way proportional solenoid valve 18, and the fifth two-position two-way proportional solenoid valve 19;On the hydraulic integrated valve block 1, there are cast a first oil inlet P1 and a second oil inlet P2 that are interconnected, a first oil outlet T1 and a second oil outlet T2 that are interconnected, a first working oil port A, a second working oil port B, a monitoring pressure oil port Mp (monitoring the oil port pressure of the first oil inlet P1), a monitoring pressure oil port Mt (monitoring the oil port pressure of the first oil outlet T1), a monitoring pressure oil port Ma (monitoring the oil port pressure of the first working oil port A), and a monitoring oil port Mb (monitoring the oil port pressure of the second working oil port B).;

[0041] As an embodiment of the present invention, for the internal connection relationship of the hydraulic integrated valve block, refer to Figure 3, specifically, the inlet of the first proportional flow control valve 11 is connected to the first oil inlet P1 and the second oil inlet P2, and the outlet of the first proportional flow control valve 11 is connected to the first working oil port A; the inlet of the second proportional flow control valve 12 is connected to the first oil outlet T1 and the second oil outlet T2, and the outlet of the second proportional flow control valve 12 is connected to the first working oil port A; the inlet of the third proportional flow control valve 13 is connected to the first oil inlet P1 and the second oil inlet P2, and the outlet of the third proportional flow control valve 13 is connected to the second working oil port B; the inlet of the fourth proportional flow control valve 14 is connected to the first oil outlet T1 and the second oil outlet T2, and the outlet of the fourth proportional flow control valve 14 is connected to the second working oil port B; the inlet of the first two-position two-way proportional solenoid valve 15 is connected to the first working oil port A, and the outlet of the first two-position two-way proportional solenoid valve 15 is connected to the second working oil port B; the inlet of the second two-position two-way proportional solenoid valve 16 is connected to the first oil inlet P1 and the second oil inlet P2, and the outlet of the second two-position two-way proportional solenoid valve 16 is connected to the first working oil port A; the inlet of the third two-position two-way proportional solenoid valve 17 is connected to the first oil outlet T1 and the second oil outlet T2, and the outlet of the third two-position two-way proportional solenoid valve 17 is connected to the first working oil port A; the inlet of the fourth two-position two-way proportional solenoid valve 18 is connected to the first oil inlet P1 and the second oil inlet P2, and the outlet of the fourth two-position two-way proportional solenoid valve 18 is connected to the second working oil port B; the inlet of the fifth two-position two-way proportional solenoid valve 19 is connected to the first oil outlet T1 and the second oil outlet T2, and the outlet of the fifth two-position two-way proportional solenoid valve 19 is connected to the second working oil port B; the inlet of the first proportional flow control valve 11 is connected to the inlet of the second two-position two-way proportional solenoid valve 16, and the outlet of the first proportional flow control valve 11 is connected to the outlet of the second two-position two-way proportional solenoid valve 16; the inlet of the second proportional flow control valve 12 is connected to the inlet of the third two-position two-way proportional solenoid valve 17, and the outlet of the second proportional flow control valve 12 is connected to the outlet of the third two-position two-way proportional solenoid valve 17; the inlet of the third proportional flow control valve 13 is connected to the inlet of the fourth two-position two-way proportional solenoid valve 18, and the outlet of the third proportional flow control valve 13 is connected to the outlet of the fourth two-position two-way proportional solenoid valve 18; the inlet of the fourth proportional flow control valve 14 is connected to the inlet of the fifth two-position two-way proportional solenoid valve 19, and the outlet of the fourth proportional flow control valve 14 is connected to the outlet of the fifth two-position two-way proportional solenoid valve 19; and the first pressure sensor 1c is connected to the first oil inlet P1, the second pressure sensor 1d is connected to the first working oil port A, the third pressure sensor 1e is connected to the second working oil port B, and the fourth pressure sensor 1f is connected to the first oil outlet T1.

[0042] The working principle of the hydraulic integrated valve block 1 disclosed in the present invention is shown in Figure 4 、 Figure 5 and Figure 6, when the piston rod of the working hydraulic cylinder extends under the active load, at this time, when the first working oil port A admits oil and the second working oil port B returns oil, after receiving the working instruction signal, the electromagnets of the first proportional flow control valve 11 and the fourth proportional flow control valve 14 are energized. The hydraulic oil enters the hydraulic circuit through the first oil inlet P1 or the second oil inlet P2, passes through the first proportional flow control valve 11 with the energized electromagnet, enters the working chamber of the hydraulic actuator from the first working oil port A, then returns to the B oil port from the oil return chamber of the hydraulic actuator, passes through the fourth proportional flow control valve 14 with the energized electromagnet and returns to the first oil outlet T1 or the second oil outlet T2, and finally returns to the fuel tank. At the same time, the pressure of the first oil inlet P1 is monitored by Mp, the pressure of the first oil outlet T1 is monitored by Mt, the pressure of the first working oil port A is monitored by Ma, and the pressure of the second working oil port B is monitored by Mb. At this time, the valve port of the first proportional flow control valve 11 is fully open, and the valve port of the fourth proportional flow control valve is adjusted proportionally for speed regulation. The first two-position two-way proportional solenoid valve 15 can be opened proportionally according to requirements under the active working condition, and the flow regeneration function can be realized; when the piston rod of the working hydraulic cylinder retracts under the passive load, at this time, the first working oil port A returns oil and the second working oil port B admits oil. The working principle of the hydraulic circuit of the electro-hydraulic control multi-way valve is similar to the aforementioned working principle. After receiving the working instruction signal, the electromagnets of the second proportional flow control valve 12 and the third proportional flow control valve 13 are energized. The hydraulic oil enters the hydraulic circuit through the first oil inlet P1 or the second oil inlet P2, passes through the third proportional flow control valve 13 with the energized electromagnet, enters the working chamber of the hydraulic actuator from the second working oil port B, then returns to the A oil port from the oil return chamber of the hydraulic actuator, passes through the second proportional flow control valve 12 with the energized electromagnet and returns to the first oil outlet T1 or the second oil outlet T2, and finally returns to the fuel tank. At the same time, the pressure of the first oil inlet P1 is monitored by Mp, the pressure of the first oil outlet T1 is monitored by Mt, the pressure of the first working oil port A is monitored by Ma, and the pressure of the second working oil port B is monitored by Mb. At this time, the valve port of the third proportional flow control valve 13 is adjusted proportionally for speed regulation, and the valve port of the second proportional flow control valve is fully open;

[0043] An electro-hydraulic control multi-way valve automatic control system disclosed by the present invention comprises a controller 4, a first pressure sensor 1c, a second pressure sensor 1d, a third pressure sensor 1e, a fourth pressure sensor 1f, an operation box 5, a display 6, electromagnets of a first proportional flow control valve 11, electromagnets of a second proportional flow control valve 12, electromagnets of a third proportional flow control valve 13, electromagnets of a fourth proportional flow control valve 14, electromagnets of a first two-position two-way proportional solenoid valve 15, electromagnets of a second two-position two-way proportional solenoid valve 16, electromagnets of a third two-position two-way proportional solenoid valve 17, electromagnets of a fourth two-position two-way proportional solenoid valve 18, and electromagnets of a fifth two-position two-way proportional solenoid valve 19. Operation buttons such as start-stop buttons, speed setting buttons, alarm buttons, and emergency braking buttons are installed on the operation box 5. The operation buttons of the operation box 5 are connected to the input terminals of the controller 4 through electric wires. The input terminals of the first pressure sensor 1c, the second pressure sensor 1d, the third pressure sensor 1e, the fourth pressure sensor 1f, the electromagnets of the first proportional flow control valve 11, the electromagnets of the second proportional flow control valve 12, the electromagnets of the third proportional flow control valve 13, the electromagnets of the fourth proportional flow control valve 14, the electromagnets of the first two-position two-way proportional solenoid valve 15, the electromagnets of the second two-position two-way proportional solenoid valve 16, the electromagnets of the third two-position two-way proportional solenoid valve 17, the electromagnets of the fourth two-position two-way proportional solenoid valve 18, and the electromagnets of the fifth two-position two-way proportional solenoid valve 19 are connected to the output terminals of the controller 4 through electric wires.

[0044] The working principle of the electro-hydraulic control multi-way valve automatic control system disclosed by the present invention is as follows: When the working hydraulic cylinder is subjected to an active load and the piston rod extends, at this time, according to the loading force displayed on the display 6, the pressures of the solenoids of the first proportional flow control valve 11 and the second two-position two-way proportional solenoid valve 16 are adjusted, and a current value is input to the solenoids of the first proportional flow control valve 11 and the second two-position two-way proportional solenoid valve 16 through the controller 4. Then, the high-pressure hydraulic oil is input from the hydraulic source, flows through the first proportional flow control valve 11 and the second two-position two-way proportional solenoid valve 16 from the oil inlet P1 through the internal pipeline, flows into the rodless cavity of the working hydraulic cylinder, and flows back to the oil tank through the rod cavity of the working hydraulic cylinder, the third proportional flow control valve 13 and the fourth two-position two-way proportional solenoid valve 18. Since the rodless cavity of the working hydraulic cylinder is at high pressure and the rod cavity is at low pressure, due to the pressure difference, the hydraulic oil will push the piston of the working hydraulic cylinder to produce an extending movement; when the working hydraulic cylinder is subjected to a passive load and the piston rod retracts, at this time, according to the loading force displayed on the display 6, the pressures of the solenoids of the fourth proportional flow control valve 14 and the fifth two-position two-way proportional solenoid valve 19 are adjusted, and a current value is input to the solenoids of the fourth proportional flow control valve 14 and the fifth two-position two-way proportional solenoid valve 19 through the controller 5. Then, the high-pressure hydraulic oil is input from the hydraulic source, flows through the fourth proportional flow control valve 14 and the fifth two-position two-way proportional solenoid valve 19 from the oil inlet P2 through the internal pipeline, flows into the rod cavity of the working hydraulic cylinder, and flows back to the oil tank through the rodless cavity of the working hydraulic cylinder, the second proportional flow control valve 12 and the third two-position two-way proportional solenoid valve 17. Since the rod cavity of the working hydraulic cylinder is at high pressure and the rodless cavity is at low pressure, due to the pressure difference, the hydraulic oil will push the piston of the working hydraulic cylinder to produce a retracting movement.

[0045] On the other hand, the present invention discloses an automatic control usage method for an electro-hydraulic control multi-way valve, including the following steps:

[0046] Step 1: Start. The automatic control system of the electro-hydraulic control multi-way valve starts.

[0047] Step 2: Initialization. Initialize the automatic control system of the electro-hydraulic control multi-way valve, check whether the system works normally. If it is not normal, do not execute downward and give an alarm; if it is normal, execute downward.

[0048] Step 3: Data acquisition. The controller collects relevant signals through the operation buttons on the operation box, the first pressure sensor 1c, the second pressure sensor 1d, the third pressure sensor 1e, and the fourth pressure sensor 1f, and then proceeds to the next step.

[0049] Step 4: Judgment of active working condition and passive working condition. If the system is in the active working condition, execute Step 5.1; if the system is in the passive working condition, execute 5.2.

[0050] Step 5.1: When the system determines it is in the active working condition, the hydraulic oil flows from the pump source through the internal pipeline from the oil inlet P 1 and enters the first flow control valve 11 and the second two-position two-way proportional solenoid valve 16. At this time, the valve ports of the first flow control valve 11 and the second two-position two-way proportional solenoid valve 16 are fully open. Then the hydraulic oil enters the rodless cavity of the hydraulic cylinder, and the hydraulic oil in the rod cavity passes through the third flow control valve 13 and the fourth two-position two-way proportional solenoid valve 18 and enters the fuel tank. At this time, the valve ports of the third flow control valve 13 and the fourth two-position two-way proportional solenoid valve 18 are adjusted proportionally for speed regulation. The hydraulic oil in the rod cavity flows into the rodless cavity through the first two-position two-way proportional solenoid valve 15 to achieve flow regeneration;

[0051] Step 5.2: When the system determines it is in the passive working condition, at this time the hydraulic oil flows from the pump source through the internal pipeline from the oil inlet P 1 and enters the fourth flow control valve 14 and the fifth two-position two-way proportional solenoid valve 19. At this time, the valve ports of the fourth flow control valve 14 and the fifth two-position two-way proportional solenoid valve 19 are adjusted proportionally for speed regulation. Then the hydraulic oil enters the rod cavity of the hydraulic cylinder, and the hydraulic oil in the rodless cavity passes through the second flow control valve 12 and the third two-position two-way proportional solenoid valve 17 and enters the fuel tank. At this time, the valve ports of the second flow control valve 12 and the third two-position two-way proportional solenoid valve 17 are fully open to realize the movement in the passive working condition;

[0052] Step 6: The automatic control of the movement of the main and passive working hydraulic cylinders is completed, and the control stops.

[0053] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0054] The above embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention should all fall within the protection scope determined by the claims of the present invention.

Claims

1. An electro-hydraulic control multi-way valve, characterized in that, it includes a number of hydraulic integrated valve blocks (1), and the controller sends control signals to each of the hydraulic integrated valve blocks (1) to achieve the control of different hydraulic actuators by the hydraulic integrated valve blocks (1); the hydraulic integrated valve block (1) includes a first proportional flow control valve (11), a second proportional flow control valve (12), a third proportional flow control valve (13), a fourth proportional flow control valve (14), a first two-position two-way proportional solenoid valve (15), a second two-position two-way proportional solenoid valve (16), a third two-position two-way proportional solenoid valve (17), a fourth two-position two-way proportional solenoid valve (18), a fifth two-position two-way proportional solenoid valve (19), a first oil port joint (1a), a second oil port joint (1b), a first pressure sensor (1c), a second pressure sensor (1d), a third pressure sensor (1e) and a fourth pressure sensor (1f). The first proportional flow control valve (11), the second proportional flow control valve (12), the third proportional flow control valve (13) and the fourth proportional flow control valve (14) are installed on one side of the hydraulic integrated valve block (1). The first two-position two-way proportional solenoid valve (15), the second two-position two-way proportional solenoid valve (16), the third two-position two-way proportional solenoid valve (17), the fourth two-position two-way proportional solenoid valve (18) and the fifth two-position two-way proportional solenoid valve (19) are installed on the side of the hydraulic integrated valve block (1) opposite to the first proportional flow control valve (11), the second proportional flow control valve (12), the third proportional flow control valve (13) and the fourth proportional flow control valve (14). The first oil port joint (1a) and the second oil port joint (1b) are installed above the hydraulic integrated valve block (1). The first pressure sensor (1c) and the second pressure sensor (1d) are installed on the same side as the first proportional flow control valve (11), the second proportional flow control valve (12), the third proportional flow control valve (13) and the fourth proportional flow control valve (14). The third pressure sensor (1e) and the fourth pressure sensor (1f) are installed on the same side as the first two-position two-way proportional solenoid valve (15), the second two-position two-way proportional solenoid valve (16), the third two-position two-way proportional solenoid valve (17), the fourth two-position two-way proportional solenoid valve (18) and the fifth two-position two-way proportional solenoid valve (19). The hydraulic integrated valve block (1) is cast with a first oil inlet P1 and a second oil inlet P2 that are interconnected, a first oil outlet T1 and a second oil outlet T2 that are interconnected, a first working oil port A, a second working oil port B, a monitoring pressure oil port Mp, a monitoring pressure oil port Mt, a monitoring pressure oil port Ma, and a monitoring oil port Mb. And the first pressure sensor (1c) is connected to the first oil inlet P1, the second pressure sensor (1d) is connected to the first working oil port A, the third pressure sensor (1e) is connected to the second working oil port B, and the fourth pressure sensor (1f) is connected to the first oil outlet T1; The inlet of the first proportional flow control valve (11) is connected to the first oil inlet P1 and the second oil inlet P2, and the outlet of the first proportional flow control valve (11) is connected to the first working oil port A; the inlet of the second proportional flow control valve (12) is connected to the first oil outlet T1 and the second oil outlet T2, and the outlet of the second proportional flow control valve (12) is connected to the first working oil port A; the inlet of the third proportional flow control valve (13) is connected to the first oil inlet P1 and the second oil inlet P2, and the outlet of the third proportional flow control valve (13) is connected to the second working oil port B; the inlet of the fourth proportional flow control valve (14) is connected to the first oil outlet T1 and the second oil outlet T2, and the outlet of the fourth proportional flow control valve (14) is connected to the second working oil port B; the inlet of the first two-position two-way proportional solenoid valve (15) is connected to the first working oil port A, and the outlet of the first two-position two-way proportional solenoid valve (15) is connected to the second working oil port B; the inlet of the second two-position two-way proportional solenoid valve (16) is connected to the first oil inlet P1 and the second oil inlet P2, and the outlet of the second two-position two-way proportional solenoid valve (16) is connected to the first working oil port A; the inlet of the third two-position two-way proportional solenoid valve (17) is connected to the first oil outlet T1 and the second oil outlet T2, and the outlet of the third two-position two-way proportional solenoid valve (17) is connected to the first working oil port A; the inlet of the fourth two-position two-way proportional solenoid valve (18) is connected to the first oil inlet P1 and the second oil inlet P2, and the outlet of the fourth two-position two-way proportional solenoid valve (18) is connected to the second working oil port B; the inlet of the fifth two-position two-way proportional solenoid valve (19) is connected to the first oil outlet T1 and the second oil outlet T2, and the outlet of the fifth two-position two-way proportional solenoid valve (19) is connected to the second working oil port B; the inlet of the first proportional flow control valve (11) is connected to the inlet of the second two-position two-way proportional solenoid valve (16), and the outlet of the first proportional flow control valve (11) is connected to the outlet of the second two-position two-way proportional solenoid valve (16); the inlet of the second proportional flow control valve (12) is connected to the inlet of the third two-position two-way proportional solenoid valve (17), and the outlet of the second proportional flow control valve (12) is connected to the outlet of the third two-position two-way proportional solenoid valve (17); the inlet of the third proportional flow control valve (13) is connected to the inlet of the fourth two-position two-way proportional solenoid valve (18), and the outlet of the third proportional flow control valve (13) is connected to the outlet of the fourth two-position two-way proportional solenoid valve (18); the inlet of the fourth proportional flow control valve (14) is connected to the inlet of the fifth two-position two-way proportional solenoid valve (19), and the outlet of the fourth proportional flow control valve (14) is connected to the outlet of the fifth two-position two-way proportional solenoid valve (19); and the first pressure sensor (1c) is connected to the first oil inlet P1, the second pressure sensor (1d) is connected to the first working oil port A, the third pressure sensor (1e) is connected to the second working oil port B, and the fourth pressure sensor (1f) is connected to the first oil outlet T1.

2. The electro-hydraulic control multi-way valve according to claim 1, characterized in that It includes three hydraulic integrated valve blocks (1).

3. The electro-hydraulic control multi-way valve according to claim 1, characterized in that, the first proportional flow control valve (11), the second proportional flow control valve (12), the third proportional flow control valve (13) and the fourth proportional flow control valve (14) are installed on one side of the hydraulic integrated valve block (1) by means of cartridge mounting.

4. The electro-hydraulic control multi-way valve according to claim 1, characterized in that, the first two-position two-way proportional solenoid valve (15), the second two-position two-way proportional solenoid valve (16), the third two-position two-way proportional solenoid valve (17), the fourth two-position two-way proportional solenoid valve (18) and the fifth two-position two-way proportional solenoid valve (19) are installed on the hydraulic integrated valve block (1) by means of cartridge mounting.

5. The electro-hydraulic control multi-way valve according to claim 1, characterized in that, the first oil port joint (1a) and the second oil port joint (1b) are installed above the hydraulic integrated valve block (1) by means of threaded connection.

6. The electro-hydraulic control multi-way valve according to claim 1, characterized in that, the first pressure sensor (1c) and the second pressure sensor (1d) are installed on the same side as the first proportional flow control valve (11), the second proportional flow control valve (12), the third proportional flow control valve (13) and the fourth proportional flow control valve (14); the third pressure sensor (1e) and the fourth pressure sensor (1f) are installed on the same side as the first two-position two-way proportional solenoid valve (15), the second two-position two-way proportional solenoid valve (16), the third two-position two-way proportional solenoid valve (17), the fourth two-position two-way proportional solenoid valve (18) and the fifth two-position two-way proportional solenoid valve (19).

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