Hydraulic oil cylinder control device and control method

Abstract

The invention provides a hydraulic oil cylinder control device and method, and relates to the field of hydraulic equipment. The device comprises a first hydraulic oil cylinder and a second hydraulic oil cylinder, an upper cavity of the first hydraulic oil cylinder is connected with a first directional alternating one-way valve, a normally-opened opening of the first directional alternating one-way valve is connected with a first manual operation valve, and a normally-closed opening of the first directional alternating one-way valve is connected with a first electro-hydraulic control reversing valve. A lower cavity of the first hydraulic oil cylinder is connected with a second directional alternating one-way valve, a normally-closed opening of the second directional alternating one-way valve is connected with a second electro-hydraulic control reversing valve, and a normally-opened opening of the second directional alternating one-way valve is connected with a first manual operation valve. The hydraulic oil cylinder control device provided by the invention can be matched with a manual operation mode and an electro-hydraulic control mode, can meet the working control requirements of the hydraulic oil cylinder in the scenes of sudden power failure, electronic equipment interference, insufficient voltage, narrow manual operation space and the like, and improves the working and using flexibility of the hydraulic oil cylinder.

Description

Technical Field

[0001] The invention relates to a control device, in particular to a hydraulic cylinder control device and a control method, belonging to the technical field of hydraulic equipment. Background Art

[0002] The hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). It has a simple structure and reliable operation. When using it to achieve reciprocating motion, the deceleration device can be eliminated, and there is no transmission gap, and the movement is smooth, so it is widely used in the hydraulic systems of various machines. The output force of the hydraulic cylinder is proportional to the effective area of ​​the piston and the pressure difference on both sides; the hydraulic cylinder is basically composed of a cylinder barrel and a cylinder head, a piston and a piston rod, a sealing device, a buffer device and an exhaust device. In the actual application process of the hydraulic cylinder, a control device will be set to control the operation of the hydraulic cylinder.

[0003] For example, the existing patent application number is: 200920308473.2. The utility model relates to a dual-cylinder hydraulic control device, including a first oil cylinder, a second oil cylinder, a reversing valve and an angle rotary valve. The angle rotary valve is provided with oil ports A, B, C, D, and E. The oil ports A and B are connected to the oil supply pipeline and the oil return pipeline of the hydraulic system through the reversing valve. The oil circuit of the oil port A in the angle rotary valve is divided into two paths, one of which is connected to the oil port C and is connected to the lower cavity oil port of the second oil cylinder through the oil port C, and the other is connected to the reversing interface A1. The oil circuit of the oil port B is also divided into two paths, one of which is connected to the oil port E and is connected to the upper cavity oil port of the second oil cylinder through the oil port E.

[0004] However, in actual application, the existing hydraulic cylinder control device has a single control mode, using electro-hydraulic control or manual control, which cannot adapt to different work needs and has poor ability to deal with unexpected situations, resulting in the hydraulic cylinder operation control steps affecting normal work. Summary of the invention

[0005] In order to solve the problem that the above hydraulic cylinder control device has a single control mode in actual application, uses electro-hydraulic control or manual control, and cannot adapt to different work needs, the present invention is implemented through the following technical scheme: the hydraulic cylinder control device comprises a hydraulic cylinder 1 and a hydraulic cylinder 2, the upper chamber of the hydraulic cylinder 1 is connected with a directional alternating one-way valve 1, the normally open port of the directional alternating one-way valve 1 is connected with a manually operated valve 1, the normally closed port of the directional alternating one-way valve 1 is connected with an electro-hydraulic controlled reversing valve 1, the lower chamber of the hydraulic cylinder 1 is connected with a directional alternating one-way valve 2, the directional alternating one-way valve 1 is normally open and connected with a manually operated valve 1, the normally closed port of the directional alternating one-way valve 1 is connected with an electro-hydraulic controlled reversing valve 1, the lower chamber of the hydraulic cylinder 1 is connected with a directional alternating one-way valve 2, the directional alternating one-way valve 1 is normally closed and connected with an electro-hydraulic controlled reversing valve 1, the The normally closed port of the directional alternating one-way valve 2 is connected to the electro-hydraulic controlled reversing valve 2, and the normally open port of the directional alternating one-way valve 2 is connected to the manually operated valve 1; the upper chamber of the hydraulic cylinder 2 is connected to the directional alternating one-way valve 4, and the normally open port of the directional alternating one-way valve 4 is connected to the electro-hydraulic controlled reversing valve 1, and the normally closed port of the directional alternating one-way valve 4 is connected to the manually operated valve 2; the lower chamber of the hydraulic cylinder 2 is connected to the directional alternating one-way valve 3, and the normally open port of the directional alternating one-way valve 3 is connected to the manually operated valve 2, and the normally closed port of the directional alternating one-way valve 3 is connected to the electro-hydraulic controlled reversing valve 2.

[0006] Preferably, the upper chamber of the hydraulic cylinder one is connected to the output port of the directional alternating one-way valve one, the electro-hydraulic control reversing valve one includes a connection port three and a connection port four, the normally closed port of the directional alternating one-way valve one is connected to the connection port three of the electro-hydraulic control reversing valve one, and the normally open port of the directional alternating one-way valve four is connected to the connection port four of the electro-hydraulic control reversing valve one.

[0007] Preferably, the lower chamber of the hydraulic cylinder one is connected to the output port of the directional alternating one-way valve two, the electro-hydraulic control reversing valve two includes a connection port one and a connection port two, the normally closed port of the directional alternating one-way valve two is connected to the connection port one of the electro-hydraulic control reversing valve two, and the normally closed port of the directional alternating one-way valve three is connected to the connection port two of the electro-hydraulic control reversing valve two.

[0008] Preferably, the upper chamber of the hydraulic cylinder 2 is connected to the output port of the directional alternating one-way valve 4, and the lower chamber of the hydraulic cylinder 2 is connected to the output port of the directional alternating one-way valve 3.

[0009] The hydraulic cylinder control method comprises the following steps:

[0010] Step 1: When the hydraulic cylinder 1 is extended alone by using the electro-hydraulic controlled reversing valve 1, all the manual operating valves 1 and 2 are in the neutral state, and the emulsion passes through the emulsion inlet pipeline from the pump station and the electro-hydraulic controlled reversing valve 2 and enters the normally closed port of the directional alternating check valve 2. As the emulsion pressure increases, the normally closed port of the directional alternating check valve 2 opens, and the emulsion enters the lower chamber of the hydraulic cylinder 1. The emulsion in the upper chamber of the hydraulic cylinder 1 enters from the output port of the directional alternating check valve 1 and flows out from the normally closed port of the directional alternating check valve 1. The emulsion finally enters the emulsion return pipeline through the electro-hydraulic controlled reversing valve 1;

[0011] Step 2: When the hydraulic cylinder 2 is extended alone by using the electro-hydraulic controlled reversing valve 1, all the manually operated valves 2 are in the neutral state at this time, and the emulsion passes from the pump station through the emulsion inlet pipeline and the connection port 2 of the electro-hydraulic controlled reversing valve 2 into the normally closed port of the directional alternating check valve 3. As the emulsion pressure increases, the normally closed port of the directional alternating check valve 3 opens, and the emulsion enters the lower chamber of the hydraulic cylinder 2. The emulsion in the upper chamber of the hydraulic cylinder 2 enters from the output port of the directional alternating check valve 4, and flows out from the normally open port of the directional alternating check valve 4. The emulsion enters the emulsion return pipeline through the electro-hydraulic controlled reversing valve 1;

[0012] Step 3: When the electro-hydraulic controlled reversing valve 2 is used to retract the hydraulic cylinder 1 and the electro-hydraulic controlled reversing valve 1 to retract the hydraulic cylinder 2 at the same time, all the manual operated valves 1 and 2 are in the neutral state at this time, and the emulsion flows from the pump station through the emulsion inlet pipeline through the electro-hydraulic controlled reversing valve 1 into the normally open positions of the directional alternating check valve 1 and the directional alternating check valve 4, flows out from the output ports of the directional alternating check valve 1 and the directional alternating check valve 4, and enters the upper chambers of the hydraulic cylinder 1 and the hydraulic cylinder 2. The emulsion in the lower chamber of the hydraulic cylinder and the lower chamber of the hydraulic cylinder 2 enters from the output ports of the directional alternating check valve 2 and the directional alternating check valve 3, and flows out from the normally open positions of the directional alternating check valve 2 and the directional alternating check valve 3, and the emulsion enters the emulsion return pipeline through the manually operated valve 1 and the manually operated valve 2;

[0013] Step 4: When the hydraulic cylinder 1 is extended alone by the manual operation valve 1, the emulsion flows from the pump station through the emulsion inlet pipeline and the manual operation valve 1 into the normally open position of the directional alternating one-way valve 2, flows out from the output port of the directional alternating one-way valve 2 into the lower chamber of the hydraulic cylinder 1, the emulsion in the upper chamber of the hydraulic cylinder 1 enters from the output port of the directional alternating one-way valve 1, flows out from the normally closed port of the directional alternating one-way valve 1, the normally closed port of the directional alternating one-way valve 1 is connected to the connection port 3 of the electro-hydraulic control reversing valve 1, and the emulsion enters the emulsion return pipeline through the electro-hydraulic control reversing valve 1;

[0014] Step 5: When the hydraulic cylinder 2 is extended alone by manually operating the valve 2, the emulsion flows from the pump station through the emulsion inlet pipeline and the manual operating valve 2 into the normally open position of the directional alternating one-way valve 3, flows out from the output port of the directional alternating one-way valve 3 and enters the lower chamber of the hydraulic cylinder 2, the emulsion in the upper chamber of the hydraulic cylinder 2 enters from the output port of the directional alternating one-way valve 4, flows out from the normally open position of the directional alternating one-way valve 4, and the emulsion enters the emulsion return pipeline through the electro-hydraulic control reversing valve 1;

[0015] Step 6: When the hydraulic cylinder 1 is retracted alone by using the manual operation valve 1, the emulsion flows from the pump station through the emulsion inlet pipeline and the manual operation valve 1 into the normally closed port of the directional alternating one-way valve 1. As the emulsion pressure increases, the normally closed port of the directional alternating one-way valve 1 opens, and the emulsion enters from the normally closed port of the directional alternating one-way valve 1, flows out from the output port of the directional alternating one-way valve 1 and enters the upper chamber of the hydraulic cylinder 1. The emulsion in the lower chamber of the hydraulic cylinder 1 enters from the output port of the directional alternating one-way valve 2, flows out from the normally open port of the directional alternating one-way valve 2, and enters the emulsion return pipeline through the manual operation valve 1;

[0016] Step seven: When the hydraulic cylinder two is retracted alone by using the manual operation valve two, the emulsion flows from the pump station through the emulsion inlet pipe and the manual operation valve two into the normally closed port of the directional alternating one-way valve four. As the emulsion pressure increases, the normally closed port of the directional alternating one-way valve four opens, and the emulsion enters from the normally closed port of the directional alternating one-way valve four, flows out from the output port of the directional alternating one-way valve four and enters the upper chamber of the hydraulic cylinder two. The emulsion in the lower chamber of the hydraulic cylinder two enters from the output port of the directional alternating one-way valve three, flows out from the normally open port of the directional alternating one-way valve three, and enters the emulsion return pipe through the manual operation valve two.

[0017] The present invention provides a hydraulic cylinder control device and a control method, which have the following beneficial effects:

[0018] Manual operation valve 1, manual operation valve 2, electro-hydraulic control reversing valve 2, electro-hydraulic control reversing valve 1, directional alternating check valve 3, directional alternating check valve 4, directional alternating check valve 2, directional alternating check valve 1 and other structures constitute a hydraulic cylinder control device that can cooperate with manual operation mode and electro-hydraulic control mode. It can adapt to the hydraulic cylinder working control needs in scenarios such as sudden power outages, interference from electronic equipment, insufficient voltage, and narrow manual operation space, and improve the flexibility of hydraulic cylinder operation and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0020] Explanation of the accompanying drawings: 1. Manually operated valve one; 2. Manually operated valve two; 3. Electro-hydraulic controlled reversing valve two; 31. Connection port one; 32. Connection port two; 4. Electro-hydraulic controlled reversing valve one; 41. Connection port three; 42. Connection port four; 5. Hydraulic cylinder one; 6. Hydraulic cylinder two; 7. Directional alternating one-way valve three; 8. Directional alternating one-way valve four; 9. Directional alternating one-way valve two; 10. Directional alternating one-way valve one. DETAILED DESCRIPTION

[0021] Embodiments of the present invention provide a hydraulic cylinder control device and a control method.

[0022] See also Figure 1 The hydraulic cylinder control device includes a hydraulic cylinder 15 and a hydraulic cylinder 26. The upper chamber of the hydraulic cylinder 15 is connected with a directional alternating one-way valve 10. The upper chamber of the hydraulic cylinder 15 is connected with the output port of the directional alternating one-way valve 10. The normally open port of the directional alternating one-way valve 10 is connected with a manual operation valve 1. The normally closed port of the directional alternating one-way valve 10 is connected with an electro-hydraulic control reversing valve 4. The electro-hydraulic control reversing valve 4 includes a connection port 3 41 and a connection port 4 42. The normally closed port of the directional alternating one-way valve 10 is connected with the electro-hydraulic control reversing valve 4. The connection port 341 is connected to the lower chamber of the hydraulic oil cylinder 15, and the lower chamber of the hydraulic oil cylinder 15 is connected to the output port of the directional alternating check valve 29. The normally closed port of the directional alternating check valve 29 is connected to the electro-hydraulic control reversing valve 23. The electro-hydraulic control reversing valve 23 includes a connection port 131 and a connection port 232. The normally closed port of the directional alternating check valve 29 is connected to the connection port 131 of the electro-hydraulic control reversing valve 23, and the normally open port of the directional alternating check valve 29 is connected to the manual operation valve 1; the upper chamber of the hydraulic oil cylinder 26 is connected to A directional alternating one-way valve 48 is connected, the upper chamber of the hydraulic oil cylinder 26 is connected to the output port of the directional alternating one-way valve 48, the normally open port of the directional alternating one-way valve 48 is connected to the electro-hydraulic control reversing valve 14, the normally open port of the directional alternating one-way valve 48 is connected to the connection port 442 of the electro-hydraulic control reversing valve 14, the normally closed port of the directional alternating one-way valve 48 is connected to the manual operation valve 22, the lower chamber of the hydraulic oil cylinder 26 is connected to the directional alternating one-way valve 37, the lower chamber of the hydraulic oil cylinder 26 is connected to the output port of the directional alternating one-way valve 37, the directional alternating one-way valve The normally open port of valve 37 is connected to the manual operation valve 2, the normally closed port of directional alternating one-way valve 37 is connected to the electro-hydraulic control reversing valve 23, and the normally closed port of directional alternating one-way valve 37 is connected to the connection port 232 of the electro-hydraulic control reversing valve 23. The above-mentioned structure cooperates to provide a hydraulic cylinder control device that can cooperate with the manual operation mode and the electro-hydraulic control mode, which can adapt to the hydraulic cylinder working control needs in scenarios such as sudden power outages, interference from electronic equipment, insufficient voltage, and narrow manual operation space, thereby improving the flexibility of hydraulic cylinder operation and use.

[0023] The hydraulic cylinder control method comprises the following steps:

[0024] Step 1: When the hydraulic cylinder 15 is extended alone by using the electro-hydraulic controlled reversing valve 14, all the manual operating valves 1 and 2 are in the middle position at this time, and the emulsion passes from the pump station through the emulsion inlet pipeline and the electro-hydraulic controlled reversing valve 23 to the normally closed port of the directional alternating one-way valve 29. As the emulsion pressure increases, the normally closed port of the directional alternating one-way valve 29 opens, the lower chamber of the hydraulic cylinder 15 is connected to the output port of the directional alternating one-way valve 29, and the emulsion enters the lower chamber of the hydraulic cylinder 15. The emulsion in the upper chamber of the hydraulic cylinder 15 enters from the output port of the directional alternating one-way valve 10 and flows out from the normally closed port of the directional alternating one-way valve 10. The normally closed port of the directional alternating one-way valve 10 is connected to the connection port 3 41 of the electro-hydraulic controlled reversing valve 14, and the emulsion finally enters the emulsion return pipeline through the electro-hydraulic controlled reversing valve 4;

[0025] Step 2: When the hydraulic cylinder 2 6 is extended alone by using the electro-hydraulic controlled reversing valve 1 4, all the manually operated valves 2 2 are in the neutral state at this time, and the emulsion flows from the pump station through the emulsion inlet pipeline and the connection port 2 32 of the electro-hydraulic controlled reversing valve 2 3 into the normally closed port of the directional alternating one-way valve 3 7. As the emulsion pressure increases, the normally closed port of the directional alternating one-way valve 3 7 opens, the lower chamber of the hydraulic cylinder 2 6 is connected to the output port of the directional alternating one-way valve 3 7, and the emulsion enters the lower chamber of the hydraulic cylinder 2 6. The emulsion in the upper chamber of the hydraulic cylinder 2 6 enters from the output port of the directional alternating one-way valve 4 8 and flows out from the normally open port of the directional alternating one-way valve 4 8. The normally open port of the directional alternating one-way valve 4 8 is connected to the connection port 4 42 of the electro-hydraulic controlled reversing valve 1 4, and the emulsion enters the emulsion return pipeline through the electro-hydraulic controlled reversing valve 1 4;

[0026] Step 3: When the electro-hydraulic controlled reversing valve 23 is used to make the hydraulic cylinder 15 and the electro-hydraulic controlled reversing valve 14 retract the hydraulic cylinder 26 at the same time, at this time, all the manual operation valves 11 and the manual operation valve 22 are in the middle state, and the emulsion passes through the emulsion inlet pipeline from the pump station through the electro-hydraulic controlled reversing valve 14 and enters the normally open position of the directional alternating check valve 10 and the directional alternating check valve 48, flows out from the output port of the directional alternating check valve 10 and the directional alternating check valve 48, enters the upper chamber of the hydraulic cylinder 15 and the hydraulic cylinder 26, and the emulsion in the lower chamber of the hydraulic cylinder 15 and the lower chamber of the hydraulic cylinder 26 enters from the output port of the directional alternating check valve 29 and the directional alternating check valve 37, flows out from the normally open position of the directional alternating check valve 29 and the directional alternating check valve 37, and the emulsion enters the emulsion return pipeline through the manual operation valve 11 and the manual operation valve 22;

[0027] Step 4: When the manual operation valve 1 is used to extend the hydraulic cylinder 5 alone, the emulsion flows from the pump station through the emulsion inlet pipeline through the manual operation valve 1 to the normally open position of the directional alternating one-way valve 29, flows out from the output port of the directional alternating one-way valve 29 to enter the lower chamber of the hydraulic cylinder 5, and the emulsion in the upper chamber of the hydraulic cylinder 5 enters from the output port of the directional alternating one-way valve 10, and flows out from the normally closed port of the directional alternating one-way valve 10. The normally closed port of the directional alternating one-way valve 10 is connected to the connection port 3 41 of the electro-hydraulic control reversing valve 4, and the emulsion enters the emulsion return pipeline through the electro-hydraulic control reversing valve 4;

[0028] Step 5: When the manual operation valve 22 is used to extend the hydraulic cylinder 26 alone, the emulsion flows from the pump station through the emulsion inlet pipeline through the manual operation valve 22 into the normally open position of the directional alternating one-way valve 37, flows out from the output port of the directional alternating one-way valve 37 into the lower chamber of the hydraulic cylinder 26, and the emulsion in the upper chamber of the hydraulic cylinder 26 enters from the output port of the directional alternating one-way valve 48, and flows out from the normally open position of the directional alternating one-way valve 48. The normally open position of the directional alternating one-way valve 48 is connected to the connection port 442 of the electro-hydraulic control reversing valve 14, and the emulsion enters the emulsion return pipeline through the electro-hydraulic control reversing valve 14;

[0029] Step 6: When the manual operation valve 1 is used to retract the hydraulic cylinder 5 alone, the emulsion flows from the pump station through the emulsion inlet pipeline and the manual operation valve 1 into the normally closed port of the directional alternating one-way valve 10. As the emulsion pressure increases, the normally closed port of the directional alternating one-way valve 10 opens, and the emulsion enters from the normally closed port of the directional alternating one-way valve 10, flows out from the output port of the directional alternating one-way valve 10 and enters the upper chamber of the hydraulic cylinder 5. The emulsion in the lower chamber of the hydraulic cylinder 5 enters from the output port of the directional alternating one-way valve 29, and flows out from the normally open port of the directional alternating one-way valve 29. The normally open port of the directional alternating one-way valve 29 is connected to the manual operation valve 1, and the emulsion enters the emulsion return pipeline through the manual operation valve 1;

[0030] Step seven: When the manual operating valve 22 is used to retract the hydraulic cylinder 26 alone, the emulsion flows from the pump station through the emulsion inlet pipeline and the manual operating valve 22 into the normally closed port of the directional alternating one-way valve 48. As the emulsion pressure increases, the normally closed port of the directional alternating one-way valve 48 opens, and the emulsion enters from the normally closed port of the directional alternating one-way valve 48, flows out from the output port of the directional alternating one-way valve 48 and enters the upper chamber of the hydraulic cylinder 26. The emulsion in the lower chamber of the hydraulic cylinder 26 enters from the output port of the directional alternating one-way valve 37, and flows out from the normally open port of the directional alternating one-way valve 37. The normally open port of the directional alternating one-way valve 37 is connected to the manual operating valve 22, and the emulsion enters the emulsion return pipeline through the manual operating valve 22.

Claims

1. A hydraulic cylinder control device, comprising a hydraulic cylinder 1 (5) and a hydraulic cylinder 2 (6), characterized in that: The upper chamber of the hydraulic cylinder 1 (5) is connected to a directional alternating check valve 1 (10), the normally open port of the directional alternating check valve 1 (10) is connected to a manually operated valve 1 (1), the normally closed port of the directional alternating check valve 1 (10) is connected to an electro-hydraulic controlled reversing valve 1 (4), the lower chamber of the hydraulic cylinder 1 (5) is connected to a directional alternating check valve 2 (9), the normally closed port of the directional alternating check valve 2 (9) is connected to an electro-hydraulic controlled reversing valve 2 (3), and the normally open port of the directional alternating check valve 2 (9) is connected to the manually operated valve 1 (1); The upper chamber of the hydraulic cylinder 2 (6) is connected to a directional alternating check valve 4 (8), the normally open port of the directional alternating check valve 4 (8) is connected to the electro-hydraulic control reversing valve 1 (4), the normally closed port of the directional alternating check valve 4 (8) is connected to the manually operated valve 2 (2), the lower chamber of the hydraulic cylinder 2 (6) is connected to a directional alternating check valve 3 (7), the normally open port of the directional alternating check valve 3 (7) is connected to the manually operated valve 2 (2), and the normally closed port of the directional alternating check valve 3 (7) is connected to the electro-hydraulic control reversing valve 2 (3).

2. The hydraulic cylinder control device according to claim 1, characterized in that: The upper chamber of the hydraulic cylinder 1 (5) is connected to the output port of the directional alternating one-way valve 1 (10), the electro-hydraulic control reversing valve 1 (4) includes a connection port 3 (41) and a connection port 4 (42), the normally closed port of the directional alternating one-way valve 1 (10) is connected to the connection port 3 (41) of the electro-hydraulic control reversing valve 1 (4), and the normally open port of the directional alternating one-way valve 4 (8) is connected to the connection port 4 (42) of the electro-hydraulic control reversing valve 1 (4).

3. The hydraulic cylinder control device according to claim 1, characterized in that: The lower chamber of the hydraulic cylinder 1 (5) is connected to the output port of the directional alternating one-way valve 2 (9), the electro-hydraulic control reversing valve 2 (3) comprises a connection port 1 (31) and a connection port 2 (32), the normally closed port of the directional alternating one-way valve 2 (9) is connected to the connection port 1 (31) of the electro-hydraulic control reversing valve 2 (3), and the normally closed port of the directional alternating one-way valve 3 (7) is connected to the connection port 2 (32) of the electro-hydraulic control reversing valve 2 (3).

4. The hydraulic cylinder control device according to claim 1, characterized in that: The upper chamber of the hydraulic cylinder 2 (6) is connected to the output port of the directional alternating one-way valve 4 (8), and the lower chamber of the hydraulic cylinder 2 (6) is connected to the output port of the directional alternating one-way valve 3 (7).

5. A hydraulic cylinder control method, applicable to a hydraulic cylinder control device as claimed in any one of claims 1 to 4, characterized in that: The steps include: Step 1: When the hydraulic cylinder 1 (5) is extended independently by using the electro-hydraulic control reversing valve 1 (4), all the manual operation valves 1 (1) and 2 (2) are in the neutral state, and the emulsion flows from the pump station through the emulsion inlet pipeline and the electro-hydraulic control reversing valve 2 (3) into the normally closed port of the directional alternating check valve 2 (9). As the emulsion pressure increases, the normally closed port of the directional alternating check valve 2 (9) opens, and the lower chamber of the hydraulic cylinder 1 (5) and the directional alternating check valve 2 (9) are closed. The output port of the one-way valve 2 (9) is connected, and the emulsion enters the lower chamber of the hydraulic cylinder 1 (5). The emulsion in the upper chamber of the hydraulic cylinder 1 (5) enters from the output port of the directional alternating one-way valve 1 (10), and flows out from the normally closed port of the directional alternating one-way valve 1 (10). The normally closed port of the directional alternating one-way valve 1 (10) is connected to the connection port 3 (41) of the electro-hydraulic control reversing valve 1 (4), and the emulsion finally enters the emulsion return pipe through the electro-hydraulic control reversing valve 1 (4); Step 2: When the hydraulic cylinder 2 (6) is extended independently by using the electro-hydraulic control reversing valve 1 (4), all the manually operated valves 2 (2) are in the neutral state, and the emulsion enters the normally closed port of the directional alternating check valve 3 (7) from the pump station through the emulsion inlet pipeline and the connecting port 2 (32) of the electro-hydraulic control reversing valve 2 (3). As the emulsion pressure increases, the normally closed port of the directional alternating check valve 3 (7) opens, and the lower chamber of the hydraulic cylinder 2 (6) is in contact with the fixed position. The output port of the directional alternating check valve 3 (7) is connected, and the emulsion enters the lower chamber of the hydraulic cylinder 2 (6). The emulsion in the upper chamber of the hydraulic cylinder 2 (6) enters from the output port of the directional alternating check valve 4 (8) and flows out from the normally open port of the directional alternating check valve 4 (8). The normally open port of the directional alternating check valve 4 (8) is connected to the connection port 4 (42) of the electro-hydraulic control reversing valve 1 (4), and the emulsion enters the emulsion return pipe through the electro-hydraulic control reversing valve 1 (4); Step 3: When the hydraulic cylinder 1 (5) and the hydraulic cylinder 2 (6) are retracted simultaneously by using the electro-hydraulic control reversing valve 2 (3), all the manual operation valves 1 (1) and 2 (2) are in the neutral state, and the emulsion flows from the pump station through the emulsion inlet pipeline and the electro-hydraulic control reversing valve 1 (4) into the normally open positions of the directional alternating check valve 1 (10) and the directional alternating check valve 4 (8), and then flows out from the directional alternating check valve 1 (10) and the directional alternating check valve 4 (8). The emulsion flows out of the output port of the directional alternating check valve 4 (8) and enters the upper chambers of the hydraulic cylinder 1 (5) and the hydraulic cylinder 2 (6). The emulsion in the lower chamber of the hydraulic cylinder 1 (5) and the hydraulic cylinder 2 (6) enters from the output ports of the directional alternating check valve 2 (9) and the directional alternating check valve 3 (7), and flows out from the normally opened ports of the directional alternating check valve 2 (9) and the directional alternating check valve 3 (7). The emulsion enters the emulsion return pipe through the manually operated valve 1 (1) and the manually operated valve 2 (2); Step 4: When the hydraulic cylinder 1 (5) is extended independently by using the manual operation valve 1 (1), the emulsion flows from the pump station through the emulsion inlet pipe and the manual operation valve 1 (1) into the normally open position of the directional alternating check valve 2 (9), flows out from the output port of the directional alternating check valve 2 (9) into the lower chamber of the hydraulic cylinder 1 (5), the emulsion in the upper chamber of the hydraulic cylinder 1 (5) enters from the output port of the directional alternating check valve 1 (10), flows out from the normally closed port of the directional alternating check valve 1 (10), the normally closed port of the directional alternating check valve 1 (10) is connected to the connection port 3 (41) of the electro-hydraulic control reversing valve 1 (4), and the emulsion flows into the emulsion return pipe through the electro-hydraulic control reversing valve 1 (4); Step 5: When the hydraulic cylinder 2 (6) is extended independently by manually operating the valve 2 (2), the emulsion flows from the pump station through the emulsion inlet pipe and the manual operating valve 2 (2) into the normally open position of the directional alternating check valve 3 (7), flows out from the output port of the directional alternating check valve 3 (7) into the lower chamber of the hydraulic cylinder 2 (6), the emulsion in the upper chamber of the hydraulic cylinder 2 (6) enters from the output port of the directional alternating check valve 4 (8), flows out from the normally open position of the directional alternating check valve 4 (8), the normally open position of the directional alternating check valve 4 (8) is connected to the connection port 4 (42) of the electro-hydraulic control reversing valve 1 (4), and the emulsion flows into the emulsion return pipe through the electro-hydraulic control reversing valve 1 (4); Step 6: When the hydraulic cylinder 1 (5) is withdrawn independently by using the manual operation valve 1 (1), the emulsion flows from the pump station through the emulsion inlet pipeline and the manual operation valve 1 (1) into the normally closed port of the directional alternating check valve 1 (10). As the emulsion pressure increases, the normally closed port of the directional alternating check valve 1 (10) opens, and the emulsion enters from the normally closed port of the directional alternating check valve 1 (10), flows out from the output port of the directional alternating check valve 1 (10) and enters the upper chamber of the hydraulic cylinder 1 (5). The emulsion in the lower chamber of the hydraulic cylinder 1 (5) enters from the output port of the directional alternating check valve 2 (9), flows out from the normally open port of the directional alternating check valve 2 (9), and the normally open port of the directional alternating check valve 2 (9) is connected to the manual operation valve 1 (1), and the emulsion enters the emulsion return pipeline through the manual operation valve 1 (1); Step 7: When the manual operation valve 2 (2) is used to retract the hydraulic cylinder 2 (6) alone, the emulsion flows from the pump station through the emulsion inlet pipeline and the manual operation valve 2 (2) into the normally closed port of the directional alternating check valve 4 (8). As the emulsion pressure increases, the normally closed port of the directional alternating check valve 4 (8) opens, and the emulsion enters from the normally closed port of the directional alternating check valve 4 (8), flows out from the output port of the directional alternating check valve 4 (8) and enters the upper chamber of the hydraulic cylinder 2 (6). The emulsion in the lower chamber of the hydraulic cylinder 2 (6) enters from the output port of the directional alternating check valve 3 (7), flows out from the normally open port of the directional alternating check valve 3 (7), and the normally open port of the directional alternating check valve 3 (7) is connected to the manual operation valve 2 (2). The emulsion enters the emulsion return pipeline through the manual operation valve 2 (2).

Images