CN108626188B - an automatic control valve - Google Patents

Abstract

The invention discloses an automatic control valve which is provided with a P oil port, a T oil port, a V1 working oil port, a V2 working oil port, a C1 working oil port and a C2 working oil port and comprises a first reversing valve, a second reversing valve, a first overflow valve, a second overflow valve, a first hydraulic control one-way valve and a second hydraulic control one-way valve, wherein the first reversing valve and the second reversing valve are two-position four-way reversing valves, the P1 oil port of the first reversing valve is divided into two paths, one path is communicated with the P oil port, the other path is communicated with a right control cavity of the first reversing valve, and the T1 oil port of the first reversing valve is communicated with the T oil port.

Description

an automatic control valve

technical field

The invention relates to the technical field of hydraulic valves, in particular to an automatic control valve.

Background technique

In recent years, most areas in my country have begun to popularize the application of hydraulic turning plows. The ploughing and ploughing industry with the overturned plough has the advantages of no opening and closing ridges, high production efficiency, and energy saving. The hydraulic overturning plough uses the hydraulic system of the tractor to control the alternating operation of the left and right plough bodies, so as to achieve the purpose of no opening and closing ridges. At present, the control method of single oil cylinder is generally used for small turning plows, while the control method of double oil cylinders is adopted for large turning plows. The hydraulic overturning plow controlled by double oil cylinder mainly includes a lifting oil cylinder and a turning oil cylinder. The two oil cylinders are controlled by the hydraulic system of the tractor. When the plow is in working state, both the lifting oil cylinder and the turning oil cylinder are in the maximum extension state. When it is necessary to reverse the direction, it is necessary to first control the lifting cylinder to shorten and lift the plow. When the lifting cylinder is in place, control the retraction of the overturning cylinder to drive the plough beam upwards. When the plough beam rotates to a nearly vertical position, control the overturning cylinder to extend. Make the plough beam over the "dead point" position, and continue to rotate under the action of the thrust and gravity of the oil cylinder until the overturning oil cylinder is fully extended, and then control the lifting cylinder to fully extend. At present, the rollover control valve used to control the double oil cylinder at home and abroad is mainly a manual hydraulic rollover control valve. The manual control type is that the tractor driver directly controls the manual slide valve to control the oil circuit of the lifting cylinder so that the two-way plow is lifted first, and then the manual slide valve is reversed to control the overturning cylinder to start overturning. The rotary valve converts the oil circuit of the oil cylinder to complete the turning direction, and then manually controls the spool valve to control the extension of the lifting oil cylinder. When the headland turns, the tractor driver must control the steering wheel and lift the plough. Overturning the control valve, it is very tense and hectic to complete these actions in a very short time, and the labor intensity increases; at the same time, three control slide valves (one slide valve for lifting the oil cylinder control, one slide valve for the overturn control) are required. Two valves) are not only complex in structure, but also high in cost.

SUMMARY OF THE INVENTION

(1) Technical problems to be solved

The purpose of the present invention is to overcome the defects in the prior art, and to provide a valve with simple structure and low manufacturing cost, which can realize automatic control of the double-cylinder overturning plow.

(2) Technical solutions

In order to achieve the above purpose, the present invention provides an automatic control valve, which is provided with a P oil port, a T oil port, a V1 working oil port, a V2 working oil port, a C1 working oil port, and a C2 working oil port, which includes a first change Directional valve, second reversing valve, first relief valve, second relief valve, first hydraulically controlled check valve, second hydraulically controlled check valve, the first reversing valve and the second reversing valve Both are two-position four-way reversing valves. The P1 oil port of the first reversing valve is divided into two paths, one of which is connected to the P oil port, and the other is connected to the right control chamber of the first reversing valve. The T1 oil port of the first reversing valve is connected to the T oil port; the P2 oil port of the second reversing valve is divided into two paths, and one port is connected to the A1 oil port of the first reversing valve. The other way is connected with the right control chamber of the second reversing valve; the T2 oil port of the second reversing valve is connected with the T oil port; the B1 oil of the first reversing valve The port is connected with the V1 working oil port, the A2 oil port of the second reversing valve is divided into two paths, one is connected with the C2 working oil port, and the other works with the C1 through the one-way relief valve. The oil ports are communicated, and the B2 oil port of the second reversing valve is communicated with the V2 working oil port;

The oil inlet of the first relief valve is communicated with the V1 working oil port, and the oil outlet of the first relief valve is communicated with the control oil port of the first hydraulic control check valve; so The oil inlet of the second relief valve is communicated with the V2 working oil port, and the oil outlet of the second relief valve is communicated with the control oil port of the second hydraulic control check valve;

The oil inlet of the first hydraulic control check valve is communicated with the left control cavity of the first reversing valve, and the left control cavity of the first reversing valve is provided with a first spring; the first The oil outlet of the hydraulic control check valve is communicated with the T oil port, the oil inlet of the second hydraulic control check valve is communicated with the left control cavity of the second reversing valve, and the second hydraulic control check valve is communicated with the left control cavity of the second direction valve. A second spring is arranged in the left control cavity of the reversing valve; the oil outlet of the second hydraulic control check valve is communicated with the T oil port;

The A1 oil port of the first reversing valve is communicated with the control oil port of the first hydraulic control check valve through the first damper; the A2 oil port of the second reversing valve is connected to the control oil port through the second damper. The control oil ports of the second hydraulic control check valve are communicated.

Through the above technical solution, when the automatic control hydraulic valve is working, the P oil port is connected to the oil outlet of the hydraulic pump, the T oil port is connected to the oil tank, the V1 working oil port is connected to the rod cavity of the lifting cylinder, and the C1 working oil port is connected to the rod cavity of the lifting cylinder. It is connected to the rodless cavity of the lifting cylinder, the V2 working oil port is connected to the rod cavity of the overturning cylinder, and the C2 working oil port is connected to the rodless cavity of the overturning cylinder; when it is necessary to control the overturning plow to turn over, the first reversing valve is in the first spring The second reversing valve is also in the left position under the action of the second spring. At this time, the P1 oil port is connected with the B1 oil port, and the A1 oil port is connected with the T1 oil port The P2 oil port is connected with the B2 oil port, and the A2 oil port is connected with the T2 oil port; the oil in the P oil port enters the lift through the P1 oil port, the B1 oil port and the V1 oil port The rod cavity of the oil cylinder pushes the lifting cylinder to retract, and the oil in the rodless cavity of the lifting cylinder flows to the T oil port through the C1 working oil port, the one-way relief valve, the A2 oil port and the T2 oil port, and the lifting oil cylinder continues to Retract; when the lift cylinder is retracted to the end, the pressure of the V1 working oil port rises rapidly. When it rises to the set pressure of the first relief valve that communicates with the V1 working oil port, the first relief valve opens, and the oil After passing through the P1 oil port, the B1 oil port and the first relief valve in sequence, it enters the control oil port of the first hydraulic control check valve, so that the first hydraulic control check valve is opened to unload the left control cavity of the first reversing valve. , the right control chamber of the first reversing valve is communicated with the P1 oil port, so that the first reversing valve overcomes the elastic force of the first spring to reverse to the right position, and at this time the first relief valve has been closed, but the oil in the P oil port The fluid enters the control oil port of the first hydraulic control check valve after passing through the P1 oil port, the A1 oil port and the first damper, so that the first hydraulic control check valve is in an unloaded state and the first reversing valve is kept in the right position. ;The oil of P port enters the rod cavity of the overturning cylinder through P1 oil port, A1 oil port, P2 oil port, B2 oil port, V2 working oil port in turn, pushes the overturning oil cylinder to retract, and drives the overturning plow to start to turn upwards and turn over. The oil in the rodless cavity of the cylinder goes through the C2 working oil port, the A2 oil port, and the T2 oil port in turn, and then returns to the T oil port, so that the overturning oil cylinder continues to retract; when the overturning oil cylinder retracts to the bottom, that is, the overturning plow reaches the dead center position. When the pressure of the V2 working oil port rises rapidly, when it rises to the set pressure of the second relief valve, the second relief valve opens, and the oil enters the control port of the second hydraulic control check valve, so that the second oil The control check valve opens to unload the left control cavity of the second reversing valve, and the right control cavity of the second reversing valve communicates with the P2 oil port, so that the second reversing valve overcomes the elastic force of the second spring and changes to the right position , and the second relief valve has been closed at this time, but the oil in the P port enters the second hydraulic control check valve through the P1 oil port, A1 oil port, P2 oil port, A2 oil port, and the second damper. Control the oil port to make the second hydraulic control check valve in the unloaded state to keep the second reversing valve in the right position; the oil in the P oil port passes through the P1 oil port, the A1 oil port, the P2 oil port, and the A2 oil port in turn. , After the C2 working oil port enters the rodless cavity of the flipping cylinder, push the flipping cylinder to extend and drive the flipping plow to start flipping down. The oil in the rod cavity of the flipping cylinder passes through the V2 working oil port and the B2 oil port in turn. , The T2 oil port returns to the T oil port, so that the overturning cylinder continues to extend to drive the overturning plow to overturn downwards; when the overturning oil cylinder is fully extended, that is, the entire overturning process of the overturning plow is completed, and the pressure of the C2 working oil port rises rapidly. When the pressure of the C2 working oil port rises to the opening pressure of the one-way relief valve, the oil of the P oil port enters the lifting cylinder through the P1 oil port, the A1 oil port, the P2 oil port, the A2 oil port and the C1 oil port in turn. The rodless cavity pushes the lifting cylinder out and lowers the overturning plow. The oil in the rod cavity of the lifting cylinder passes through the V1 working oil port, the B1 oil port, and the T1 oil port in turn, and then returns to the T oil port. When the lifting oil cylinder is fully extended, The hydraulic pump can stop rotating; the automatic control hydraulic valve is not only simple in structure, high in integration, convenient in installation, and low in cost, but also can automatically control the lifting and turning in sequence only by supplying oil, without the need for manual operation by the driver, and the degree of automation high.

In a further technical solution, the P1 oil port of the first reversing valve is communicated with the left control chamber of the first reversing valve through the third damper, and the P2 oil port of the second reversing valve is connected to the left control chamber of the first reversing valve through the third damper. The four dampers are communicated with the left control chamber of the second reversing valve; this arrangement can reliably keep the first reversing valve and the second reversing valve in their corresponding positions under the action of pressure and spring.

In a further technical solution, when the first reversing valve is in the left position, the P1 oil port is in communication with the B1 oil port, and the A1 oil port is in communication with the T1 oil port; the first reversing valve is in the left position. When the valve is in the right position, the P1 oil port is connected with the A1 oil port, and the B1 oil port is connected with the T1 oil port; when the second reversing valve is in the left position, the P2 oil port is connected with the oil port. The B2 oil port is connected, and the A2 oil port is connected with the T2 oil port; when the second reversing valve is in the right position, the P2 oil port is connected with the A2 oil port, and the B2 oil port is connected with The T2 oil ports are connected.

(3) Beneficial effects

Compared with the prior art, the technical solution of the present invention has the following advantages:

(1) Simple structure, high integration, convenient installation and low cost;

(2) The control of lifting and turning can be automatically realized in sequence only by supplying oil, without manual operation by the driver, and the degree of automation is high.

Description of drawings

Fig. 1 is the hydraulic principle diagram of the present invention;

FIG. 2 is a schematic diagram of the applied hydraulic pressure of the present invention.

Detailed ways

1-2, the present invention provides an automatic control valve, which is provided with a P oil port, a T oil port, a V1 working oil port, a V2 working oil port, a C1 working oil port, and a C2 working oil port, which includes a first oil port. Reversing valve 1, second reversing valve 2, first relief valve 3, second relief valve 4, first hydraulically controlled check valve 5, second hydraulically controlled check valve 6, the first reversing valve Valve 1 and the second reversing valve 2 are two-position four-way reversing valves. The P1 oil port of the first reversing valve 1 is divided into two paths, one of which is connected to the P oil port, and the other is connected to the The right control chamber of the first reversing valve 1 is connected, the T1 oil port of the first reversing valve 1 is connected to the T oil port; the P2 oil port of the second reversing valve 2 is divided into two paths, One way is connected to the A1 oil port of the first reversing valve 1, and the other way is connected to the right control chamber of the second reversing valve 2; the T2 oil port of the second reversing valve 2 is connected to the The T oil port is connected; the B1 oil port of the first reversing valve 1 is connected to the V1 working oil port, and the A2 oil port of the second reversing valve 2 is divided into two paths, one of which works with the C2 The oil port is connected, the other way is connected with the C1 working oil port through the one-way relief valve 7, and the B2 oil port of the second reversing valve 2 is connected with the V2 working oil port.

The oil inlet of the first relief valve 3 is connected with the V1 working oil port, and the oil outlet of the first relief valve 3 is connected with the control oil port of the first hydraulic control check valve 5 The oil inlet of the second relief valve 4 is communicated with the V2 working oil port, and the oil outlet of the second relief valve 4 is connected to the control oil of the second hydraulic control check valve 6 The oil inlet of the first hydraulic control check valve 5 is communicated with the left control cavity of the first reversing valve 1, and the left control cavity of the first reversing valve 1 is provided with a third A spring 13; the oil outlet of the first hydraulic control check valve 5 is connected to the T oil port, and the oil inlet of the second hydraulic control check valve 6 is connected to the second reversing valve 2 The left control cavity of the second reversing valve 2 is connected with the left control cavity, and the left control cavity of the second reversing valve 2 is provided with a second spring 14; the oil outlet of the second hydraulic control check valve 6 is communicated with the T oil port; The A1 oil port of the first reversing valve 1 is communicated with the control oil port of the first hydraulic control check valve 5 through the first damper 8; the A2 oil port of the second reversing valve 2 The second damper 9 is communicated with the control oil port of the second hydraulic control check valve 6 .

The P1 oil port of the first reversing valve 1 communicates with the left control chamber of the first reversing valve 1 through the third damper 11, and the P2 oil port of the second reversing valve 3 passes through the fourth damper The valve 12 is communicated with the left control chamber of the second reversing valve 2; this arrangement can make the first reversing valve 1 and the second reversing valve 2 reliably maintain the corresponding positions under the action of pressure and spring.

When the first reversing valve 1 is in the left position, the P1 oil port is in communication with the B1 oil port, and the A1 oil port is in communication with the T1 oil port; the first reversing valve 1 is in the right position , the P1 oil port is connected with the A1 oil port, the B1 oil port is connected with the T1 oil port; when the second reversing valve 2 is in the left position, the P2 oil port and the B2 oil port The A2 oil port is connected with the T2 oil port; when the second reversing valve 2 is in the right position, the P2 oil port is connected with the A2 oil port, and the B2 oil port is connected with the T2 port is connected.

In application, the P oil port and the T oil port of the present invention are respectively connected with the A working oil port and the B working oil port of the electromagnetic reversing valve 10 for controlling oil supply, and the V1 working oil port of the present invention is connected to the lifting oil cylinder G1. The C1 working oil port is connected to the rodless cavity of the lifting cylinder G1, the V2 working oil port is connected to the rod cavity of the overturning cylinder G2, and the C2 working oil port is connected to the rodless cavity of the overturning cylinder G2.

When the turning plow is in the working state and does not need to be turned over, the solenoid valve 10 is in a de-energized state, and the P oil port and the T oil port flow back to the unloaded state through the A working oil port and the B working oil port of the electromagnetic reversing valve 10. The first reversing valve 1 is in the left position under the action of the first spring 13, and the second reversing valve 2 is also in the left position under the action of the second spring 14. At this time, the P1 oil port is connected to the B1 oil port , the A1 oil port is communicated with the T1 oil port, the P2 oil port is communicated with the B2 oil port, and the A2 oil port is communicated with the T2 oil port.

When it is necessary to control the overturning plow to turn over, make the electromagnetic reversing valve 10 electrified, the oil in the P oil port enters the rod cavity of the lifting cylinder G1 after passing through the P1 oil port, the B1 oil port and the V1 working oil port, and pushes the lifting oil cylinder G1 When retracted, the oil in the rodless cavity of the lift cylinder G1 flows to the T oil port through the C1 working oil port, the one-way relief valve 7, the A2 oil port, and the T2 oil port, and the lift oil cylinder G1 continues to retract; when the lift oil cylinder After G1 retracts to the head, the pressure of the V1 working oil port rises rapidly. When it rises to the set pressure of the first relief valve 3 that communicates with the V1 working oil port, the first relief valve 3 opens, and the oil flows through P1 in turn. After the oil port, B1 oil port, and the first relief valve 3 enter the control oil port of the first hydraulic control check valve 5, the first hydraulic control check valve 5 is opened, and the left control cavity of the first reversing valve 1 is unloaded. load, the right control chamber of the first reversing valve 1 is communicated with the P1 oil port, so that the first reversing valve 1 is reversed to the right position against the elastic force of the first spring 13, and the first relief valve 3 has been closed at this time, but The oil in the P oil port enters the control oil port of the first hydraulic control check valve 5 through the P1 oil port, the A1 oil port and the first damper 8, so that the first hydraulic control check valve 5 is in an unloaded state, so that the first hydraulic control check valve 5 is in an unloaded state. A reversing valve 1 is kept in the right position; the oil in the P port enters the rod cavity of the reversing oil cylinder G2 through the P1 oil port, A1 oil port, P2 oil port, B2 oil port and V2 working oil port in turn to push the reversing oil cylinder The retraction of G2 drives the flip plow to turn upward, and the oil in the rodless cavity of the flip cylinder G2 passes through the C2 working oil port, the A2 oil port, and the T2 oil port in turn, and then returns to the T oil port, so that the flip cylinder G2 continues to retract; When the oil cylinder G2 is retracted to the bottom, that is, when the overturned plow reaches the dead center position, the pressure of the V2 working oil port rises rapidly. When it rises to the set pressure of the second relief valve 4, the second relief valve 4 is opened, and the oil Entering the control oil port of the second hydraulic control check valve 6 makes the second hydraulic control check valve 6 open to unload the left control chamber of the second direction valve 2, and the right control chamber of the second direction valve 2 is connected to P2. The oil ports are connected so that the second reversing valve 2 is reversed to the right position against the elastic force of the second spring 14, and the second relief valve 4 has been closed at this time, but the oil in the P oil port passes through the P1 oil port and the A1 oil port. , P2 oil port, A2 oil port, and the second damper 9 enter the control oil port of the second hydraulic control check valve 6, so that the second hydraulic control check valve 6 is in an unloaded state, so that the second reversing valve 2 is maintained. In the right position; the oil in the P port enters the rodless cavity of the turning cylinder G2 through the P1 oil port, A1 oil port, P2 oil port, A2 oil port, and C2 working oil port in turn, and pushes the turning oil cylinder G2 to extend to drive the turning plow. Start to turn down, the oil in the rod cavity of the turning cylinder G2 returns to the T oil port through the V2 working oil port, the B2 oil port, and the T2 oil port in turn, so that the turning oil cylinder G2 continues to extend to drive the turning plow to turn downward; Cylinder G2 is fully extended, that is, the flipping plow has completed the entire flipping process, and the pressure of the C2 working oil port rises rapidly. When the pressure of the C2 working oil port rises to the opening pressure of the one-way relief valve 7, the oil in the P port will rise. The fluid enters the rodless cavity of the lift cylinder G1 through the P1 oil port, A1 oil port, P2 oil port, A2 oil port, and C1 oil port in turn to promote the lift. Cylinder G1 extends and lowers the plough. The oil in the rod cavity of the lifting cylinder G1 passes through the V1 working oil port, the B1 oil port and the T1 oil port in turn, and then returns to the T oil port. When the lifting oil cylinder G1 is fully extended in place, replace the electromagnetic Power off the valve 10; the automatic control hydraulic valve is not only simple in structure, high in integration, convenient in installation and low in cost, but also can automatically realize the control of lifting and turning in order only by supplying oil, without the need for manual operation by the driver, automatic high degree.

The above descriptions are only the preferred embodiments of the present invention, and it should be pointed out that for those skilled in the art, without departing from the technical principles of the present invention, several improvements and modifications can also be made. It should also be regarded as the protection scope of the present invention.

Claims (2)

1. An automatic control valve is provided with a P oil port, a T oil port, a V1 working oil port, a V2 working oil port, a C1 working oil port and a C2 working oil port, and is characterized by comprising a first reversing valve, a second reversing valve, a first overflow valve, a second overflow valve, a first hydraulic control one-way valve and a second hydraulic control one-way valve, wherein the first reversing valve and the second reversing valve are two-position four-way reversing valves, the P1 oil port of the first reversing valve is divided into two paths, one path is communicated with the P oil port, the other path is communicated with a right control cavity of the first reversing valve, and the T1 oil port of the first reversing valve is communicated with the T oil port; the oil port P2 of the second reversing valve is divided into two paths, one path is communicated with the oil port A1 of the first reversing valve, and the other path is communicated with the right control cavity of the second reversing valve; the T2 oil port of the second reversing valve is communicated with the T oil port; the B1 oil port of the first reversing valve is communicated with the V1 working oil port, the A2 oil port of the second reversing valve is divided into two paths, one path is communicated with the C2 working oil port, the other path is communicated with the C1 working oil port through a one-way overflow valve, and the B2 oil port of the second reversing valve is communicated with the V2 working oil port;

an oil inlet of the first overflow valve is communicated with the V1 working oil port, and an oil outlet of the first overflow valve is communicated with a control oil port of the first hydraulic control check valve; an oil inlet of the second overflow valve is communicated with the V2 working oil port, and an oil outlet of the second overflow valve is communicated with a control oil port of the second hydraulic control check valve;

an oil inlet of the first hydraulic control one-way valve is communicated with a left control cavity of the first reversing valve, and a first spring is arranged in the left control cavity of the first reversing valve; an oil outlet of the first hydraulic control one-way valve is communicated with the T oil port, and a left control cavity of the second reversing valve is internally provided with a second spring; an oil inlet of the second hydraulic control one-way valve is communicated with a left control cavity of the second reversing valve, and an oil outlet of the second hydraulic control one-way valve is communicated with the T oil port;

the A1 oil port of the first reversing valve is communicated with the control oil port of the first hydraulic control one-way valve through a first damper; the A2 oil port of the second reversing valve is communicated with the control oil port of the second hydraulic control check valve through a second damper;

the P1 oil port of the first reversing valve is communicated with the left control cavity of the first reversing valve through a third damper, and the P2 oil port of the second reversing valve is communicated with the left control cavity of the second reversing valve through a fourth damper.

2. The automatic control valve of claim 1, wherein when the first reversing valve is in the left position, the P1 port is in communication with the B1 port, and the a1 port is in communication with the T1 port; when the first reversing valve is in the right position, the P1 oil port is communicated with the A1 oil port, and the B1 oil port is communicated with the T1 oil port; when the second reversing valve is in the left position, the P2 oil port is communicated with the B2 oil port, and the A2 oil port is communicated with the T2 oil port; when the second reversing valve is in the right position, the P2 oil port is communicated with the A2 oil port, and the B2 oil port is communicated with the T2 oil port.

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