CN108757625B

CN108757625B - Control valve

Info

Publication number: CN108757625B
Application number: CN201810480632.0A
Authority: CN
Inventors: 邵立坤
Original assignee: Ningbo Zhenge Hydraulic Technology Co ltd
Current assignee: Wuxi Xuanhang Hydraulic Technology Co.,Ltd.
Priority date: 2018-05-18
Filing date: 2018-05-18
Publication date: 2020-07-03
Anticipated expiration: 2038-05-18
Also published as: CN108757625A

Abstract

The invention proposes a control valve comprising: the valve comprises a valve body, a first overflow valve, a second overflow valve, a third overflow valve, a first valve core, a second valve core, a first left end cover, a first right end cover, a second left end cover, a second right end cover, a first left spring, a first right spring, a second left spring and a second right spring, wherein the first valve core is switchable among a first position, a second position, a third position and a fourth position, when the first valve core is located at the first position, the second valve core is located at a fifth position, when the first valve core is located at the second position, the second valve core is located at a sixth position, when the first valve core is located at the third position, the second valve core is located at a seventh position, and when the first valve core is located at the fourth position, the second valve core is located at an eighth position. The control valve provided by the embodiment of the invention has the advantages of simple structure and low manufacturing cost, and can realize automatic control of the double-cylinder turnover plow.

Description

Control valve

Technical Field

The invention relates to the technical field of valves, in particular to a control valve.

Background

In recent years, hydraulic reversible plows have begun to be popularized and applied in most areas of China. The turnover plow is used for plowing and turning operation, and has the advantages of no ridge opening and closing, high production efficiency, energy conservation and the like. The hydraulic turnover plow uses the hydraulic system of tractor to control the alternate operation of left and right plow bodies, so as to achieve the purpose of no opening and closing ridges.

At present, a single oil cylinder control mode is generally adopted for small-sized turnover plows, and a double-oil cylinder control mode is adopted for large-sized turnover plows. The hydraulic turnover plow controlled by double oil cylinders mainly comprises a lifting oil cylinder and a turnover oil cylinder, wherein the two oil cylinders are controlled by a hydraulic system of a tractor, and when the plow is in a working state, the lifting oil cylinder and the turnover oil cylinder are both in a maximum extension state. When the plough needs to be overturned and reversed, the lifting oil cylinder needs to be controlled to be shortened to lift the plough, the overturning oil cylinder is controlled to retract to drive the plough beam to overturn upwards after the plough beam is lifted to the right position, the overturning oil cylinder is controlled to extend out when the plough beam rotates to a position close to the vertical position, the plough beam is enabled to cross a dead point position, the plough beam continues to rotate under the action of the thrust and the gravity of the oil cylinder until the overturning oil cylinder extends out completely, and then the lifting oil cylinder is controlled to extend out completely. The turnover control valve for controlling the double oil cylinders at home and abroad is mainly a manual hydraulic turnover control valve. The manual mode is that a tractor driver directly operates a manual slide valve to control an oil way of a lifting oil cylinder to lift a bidirectional plough first, then operates the manual slide valve to reverse to control a reversing oil cylinder to start reversing, the plough shifts a shifting fork at an over-center position to drive a rotary valve to change the oil way of the oil cylinder to complete reversing, and then manually operates the slide valve to control the lifting oil cylinder to extend out; and meanwhile, three control slide valves (1 slide valve for controlling the lifting oil cylinder and 2 slide valves for controlling the overturning) are adopted, so that the structure is complex and the cost is high.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.

Therefore, the invention aims to provide the control valve which is simple in structure, low in manufacturing cost and capable of realizing automatic control of the double-cylinder turnover plow.

A control valve according to an embodiment of the present invention includes:

the valve body is provided with a first valve hole, a second valve hole, a first oil port, a second oil port, a third oil port, a fourth oil port, a fifth oil port and a sixth oil port, the first valve hole is communicated with the valve body along the left-right direction, the second valve hole is positioned on the first valve hole and is communicated with the valve body along the left-right direction, the first valve hole comprises a first left control cavity, a first through groove, a second through groove, a third through groove, a fourth through groove, a fifth through groove and a first right control cavity which are sequentially arranged from left to right at intervals, the fifth through groove is communicated with the first right control cavity, the second valve hole comprises a second left control cavity, a sixth through groove, a seventh through groove, an eighth through groove, a ninth through groove, a tenth through groove and a second right control cavity which are sequentially arranged from left to right at intervals, the tenth through groove is communicated with the second right control cavity, the first through flow groove is communicated with the first oil port, the third through flow groove is communicated with the second oil port, the fourth through flow groove is communicated with the third oil port, the fourth oil port is communicated with the fifth oil port, the seventh through flow groove is communicated with the fifth oil port, the ninth through flow groove is communicated with the sixth oil port, the fourth through flow groove is communicated with the first through flow groove through a first damping hole and is communicated with the fifth through flow groove through a first flow passage, the ninth through flow groove is communicated with the sixth through flow groove through a second damping hole and is communicated with the tenth through flow groove through a second flow passage, the first left control cavity is communicated with the first oil port through a third damping hole, the first left control cavity is communicated with the second left control cavity through a first through flow hole, the first through flow groove is communicated with the sixth through flow hole through a second through flow hole, the second through-flow groove is communicated with the eighth through-flow groove through a third through-flow hole;

the first overflow valve is arranged on the valve body and used for normally disconnecting the fourth oil port and the fifth oil port, the second overflow valve is arranged on the valve body and used for normally disconnecting the first damping hole and the fourth through groove, and the third overflow valve is arranged on the valve body and used for normally disconnecting the second damping hole and the ninth through groove;

the valve comprises a first valve core and a second valve core, wherein the first valve core is arranged in a first valve hole in a left-right moving mode, a first left blind hole is formed in the left end of the first valve core, a first right blind hole is formed in the right end of the first valve core, a first through hole communicated with the first left blind hole is formed in the side wall of the first valve core, a fourth damping hole communicated with the first right blind hole is formed in the side wall of the first valve core, the second valve core is arranged in a second valve hole in a left-right moving mode, a second left blind hole is formed in the left end of the second valve core, a second right blind hole is formed in the right end of the second valve core, a second through hole communicated with the second left blind hole is formed in the side wall of the second valve core, and a fifth damping hole communicated with the second right blind hole is formed in the side wall of the second valve core;

the first left end cover is arranged on the valve body to seal the left opening end of the first valve hole, the first right end cover is arranged on the valve body to seal the right opening end of the first valve hole, the second left end cover is arranged on the valve body to seal the left opening end of the second valve hole, and the second right end cover is arranged on the valve body to seal the right opening end of the second valve hole;

the left end of the first left spring is abutted against the first left end cover, the right end of the first left spring extends into the first left blind hole to abut against the first valve core, the first right spring is arranged in the first valve hole, the left end of the first right spring extends into the first right blind hole to abut against the first valve core, the right end of the first right spring is abutted against the first right end cover, the second left spring is arranged in the second valve hole, the left end of the second left spring is abutted against the second left end cover, the right end of the second left spring extends into the second left blind hole to abut against the second valve core, the second right spring is arranged in the second valve hole, the left end of the second right spring extends into the second right blind hole to abut against the second valve core, and the right end of the second right spring is abutted against the second valve core An end cap;

the first valve core is switchable among a first position, a second position, a third position and a fourth position, when the first valve core is in the first position, the second valve core is in the fifth position, when the first valve core is in the second position, the second valve core is in the sixth position, when the first valve core is in the third position, the second valve core is in the seventh position, and when the first valve core is in the fourth position, the second valve core is in the eighth position.

Advantageously, when the first valve core is in the first position, the first valve core closes the first through-flow groove, the first valve core enables the second through-flow groove to communicate with the first left control chamber through the first through hole, the first valve core disconnects the second through-flow groove from the third through-flow groove and closes the fourth damping hole, the first valve core enables the third through-flow groove to communicate with the fourth through-flow groove, the first valve core disconnects the fourth through-flow groove from the fifth through-flow groove, at this time, the second valve core is in a fifth position, the second valve core closes the sixth through-flow groove, the second valve core enables the seventh through-flow groove to communicate with the second left control chamber through the second through hole, the second valve core disconnects the seventh through-flow groove from the eighth through-flow groove and closes the fifth damping hole, the second spool communicates the eighth through-flow groove with the ninth through-flow groove, and the second spool 3b disconnects the ninth through-flow groove from the tenth through-flow groove.

Advantageously, when the first valve core is in the second position, the first valve core moves from left to right under the action of an external force, the first valve core opens the first through flow groove to enable the first through flow groove to communicate with the first left control chamber, the first valve core enables the second through flow groove to communicate with the first left control chamber through the first through hole, the first valve core disconnects the second through flow groove from the third through flow groove and closes the fourth damping hole, the first valve core enables the third through flow groove to communicate with the fourth through flow groove, the first valve core disconnects the fourth through flow groove from the fifth through flow groove, at this time, the second valve core is in a sixth position, the second valve core moves from left to right under the action of an external force, and the second valve core opens the sixth through flow groove to enable the sixth through flow groove to communicate with the second left control chamber, the second valve core enables the seventh through flow groove to be communicated with the second left control cavity through the second through hole, the second valve core breaks the connection between the seventh through flow groove and the eighth through flow groove and closes the fifth damping hole, the second valve core enables the eighth through flow groove to be communicated with the ninth through flow groove, and the second valve core breaks the connection between the ninth through flow groove and the tenth through flow groove.

Advantageously, when the first valve core is in the third position, the first valve core moves from right to left under the action of an external force, the first valve core disconnects the first flow passage from the first left control chamber and communicates the first flow passage with the first through hole, the first valve core connects the second flow passage with the third flow passage and communicates the fourth orifice with the second flow passage, the first valve core disconnects the third flow passage from the fourth flow passage, the first valve core connects the fourth flow passage with the fifth flow passage, and at this time, the second valve core is in a seventh position, the second valve core moves from left to right under the action of an external force, the second flow passage core opens the sixth flow passage to communicate the sixth flow passage with the second left control chamber, and the second valve core communicates the seventh flow passage with the second left control chamber through the second through hole, the second valve spool disconnects the seventh through flow groove from the eighth through flow groove and closes the fifth damping hole, the eighth through flow groove is communicated with the ninth through flow groove by the second valve spool, and the ninth through flow groove is disconnected from the tenth through flow groove by the second valve spool.

Advantageously, when the first valve core is in the fourth position, the first valve core moves from right to left under the action of an external force, the first valve core disconnects the first through-flow groove from the first left control chamber and communicates the first through-flow groove with the first through hole, the first valve core connects the second through-flow groove with the third through-flow groove and communicates the fourth orifice with the second through-flow groove, the first valve core disconnects the third through-flow groove from the fourth through-flow groove, the first valve core connects the fourth through-flow groove with the fifth through-flow groove, and at this time, the second valve core is in an eighth position, the second valve core moves from right to left under the action of an external force, the second valve core disconnects the sixth through-flow groove from the second left control chamber and communicates the sixth through-flow groove with the second through hole, the second valve element enables the seventh through flow groove to be communicated with the eighth through flow groove and enables the fifth damping hole to be communicated with the seventh through flow groove, the second valve element disconnects the eighth through flow groove from the ninth through flow groove, and the second valve element enables the ninth through flow groove to be communicated with the tenth through flow groove.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Figure 1 is a block diagram of a control valve according to one embodiment of the present invention,

FIG. 2 is a cross-sectional view taken along line D-D of FIG. 1;

figure 3 is a cross-sectional view taken along line E-E of figure 1,

FIG. 4 is a hydraulic schematic of a control valve according to one embodiment of the present invention;

FIG. 5 is a hydraulic schematic of one application scenario of a control valve according to one embodiment of the present invention;

FIG. 6 is a schematic illustration of a position of a control valve at a time of reversal according to an embodiment of the present invention;

FIG. 7 is a schematic illustration of another reverse position of the control valve according to an embodiment of the present invention;

FIG. 8 is a schematic illustration of a further reverse position of the control valve according to one embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

A control valve according to an embodiment of the present invention is described in detail below with reference to the accompanying drawings.

As shown in fig. 1 to 8, a control valve according to an embodiment of the present invention includes: the valve comprises a valve body 1, a first overflow valve 8, a second overflow valve 7a, a third overflow valve 7b, a first valve core 3a, a second valve core 3b, a first left end cover 5a, a first right end cover 6a, a second left end cover 5b, a second right end cover 6b, a first left spring 4a, a first right spring 2a, a second left spring 4b and a second right spring 2 b.

Specifically, the valve body 1 includes a first valve hole, a second valve hole, a first port T, a second port P, a third port V1, a fourth port C1, a fifth port C2, and a sixth port V2.

As shown in fig. 1, the first valve hole penetrates the valve body 1 in the left-right direction, and the second valve hole is located above the first valve hole and penetrates the valve body 1 in the left-right direction.

The first valve hole comprises a first left control cavity 1a, a first through flow groove 101, a second through flow groove 102, a third through flow groove 103, a fourth through flow groove 104, a fifth through flow groove 105 and a first right control cavity 1b which are sequentially arranged from left to right at intervals, and the fifth through flow groove 105 is communicated with the first right control cavity 1 b.

The second valve hole comprises a second left control cavity 1c, a sixth flow through groove 106, a seventh flow through groove 107, an eighth flow through groove 108, a ninth flow through groove 109, a tenth flow through groove 110 and a second right control cavity 1d which are sequentially arranged from left to right at intervals, and the tenth flow through groove 110 is communicated with the second right control cavity 1 d.

The first through flow groove 101 is communicated with the first oil port T, the third through flow groove 103 is communicated with the second oil port P, the fourth through flow groove 104 is communicated with the third oil port V1, the fourth oil port C1 is communicated with the fifth oil port C2, the seventh through flow groove 107 is communicated with the fifth oil port C2, and the ninth through flow groove 109 is communicated with the sixth oil port V2.

The fourth runner 104 is communicated with the first runner 101 through the first orifice 1e, and the fourth runner 104 is communicated with the fifth runner 105 through the first runner 1 m; the ninth through-flow groove 109 and the sixth through-flow groove 106 are communicated through the second orifice 1f and the ninth through-flow groove 109 and the tenth through-flow groove 110 are communicated through the second flow passage 1 n; the first left control chamber 1a is communicated with the first oil port T through a third orifice 1 g.

The first left control chamber 1a communicates with the second left control chamber 1c through the first through-hole 1h, the first through-flow groove 101 communicates with the sixth through-flow groove 106 through the second through-hole 1i, and the second through-flow groove 102 communicates with the eighth through-flow groove 108 through the third through-hole 1 j.

The first overflow valve 8 is arranged on the valve body 1 and is used for normally disconnecting the fourth port C1 and the fifth port C2; the second overflow valve 7a is arranged on the valve body 1 and is used for normally disconnecting the first damping hole 1e and the fourth overflow groove 104; the third relief valve 7b is provided on the valve body 1 for normally disconnecting the second orifice 1f from the ninth vent groove 109.

The first valve core 3a is arranged in the first valve hole in a left-right moving mode, the left end of the first valve core 3a is provided with a first left blind hole, the right end of the first valve core 3a is provided with a first right blind hole, the side wall of the first valve core 3a is provided with a first through hole 3a2 communicated with the first left blind hole, and the side wall of the first valve core 3a is provided with a fourth damping hole 3a1 communicated with the first right blind hole; the second valve core 3b is arranged in the second valve hole in a left-right moving mode, the left end of the second valve core 3b is provided with a second left blind hole, the right end of the second valve core 3b is provided with a first right blind hole, the side wall of the second valve core 3b is provided with a second through hole 3b2 communicated with the second left blind hole, and the side wall of the second valve core 3b is provided with a fifth damping hole 3b1 communicated with the second right blind hole.

A first left end cover 5a is arranged on the valve body 1 to close the left opening end of the first valve hole, and a first right end cover 6a is arranged on the valve body 1 to close the right opening end of the first valve hole; the second left end cover 5b is arranged on the valve body 1 to close the left opening end of the second valve hole, and the second right end cover 6b is arranged on the valve body 1 to close the right opening end of the second valve hole.

A first left spring 4a is arranged in the first valve hole, the left end of the first left spring 4a abuts against a first left end cover 5a, the right end of the first left spring 4a extends into the first left blind hole to abut against a first valve core 3a, a first right spring 2a is arranged in the first valve hole, the left end of the first right spring 2a extends into the first right blind hole to abut against the first valve core 3a, and the right end of the first right spring 2a abuts against a first right end cover 6 a; the second left spring 4b is arranged in the second valve hole, the left end of the second left spring 4b abuts against the second left end cover 5b, the right end of the second left spring 4b extends into the second left blind hole to abut against the second valve spool 3b, the second right spring 2b is arranged in the second valve hole, and the left end of the second right spring 2b extends into the second right blind hole to abut against the second valve spool 3b and the right end of the second right spring 2b abuts against the second right end cover 6 b.

Wherein the first spool 3a is switchable between a first position, a second position, a third position and a fourth position, and when the first spool 3a is in the first position, the second spool 3b is in a fifth position; when the first spool 3a is in the second position, the second spool 3b is in a sixth position; when the first spool 3a is in the third position, the second spool 3b is in the seventh position; when the first spool 3a is in the fourth position, the second spool 3b is in an eighth position.

More specifically, as shown in fig. 1 to 3, when the first spool 3a is in the first position, the first spool 3a closes the first vent groove 101, the first spool 3a makes the second vent groove 102 communicate with the first left control chamber 1a through the first through hole 3a2, the first spool 3a disconnects the second vent groove 102 from the third vent groove 103 and closes the fourth orifice 3a1, the first spool 3a makes the third vent groove 103 communicate with the fourth vent groove 104, and the first spool 3a disconnects the fourth vent groove 104 from the fifth vent groove 105. At this time, the second spool 3b is in the fifth position, the second spool 3b closes the sixth flow groove 106, the second spool 3b causes the seventh flow groove 107 to communicate with the second left control chamber 1c through the second through hole 3b2, the second spool 3b disconnects the seventh flow groove 107 from the eighth flow groove 10 and closes the fifth orifice 3b1, the second spool 3b causes the eighth flow groove 108 to communicate with the ninth flow groove 109, and the second spool 3b disconnects the ninth flow groove 109 from the tenth flow groove 110.

As shown in fig. 6, when the first valve element 3a is in the second position, the first valve element 3a moves from left to right under the action of an external force, the first valve element 3a opens the first through-flow groove 101 to enable the first through-flow groove 101 to communicate with the first left control chamber 1a, the first valve element 3a enables the second through-flow groove 102 to communicate with the first left control chamber 1a through the first through hole 3a2, the first valve element 3a disconnects the second through-flow groove 102 from the third through-flow groove 103 and closes the fourth damping hole 3a1, the first valve element 3a enables the third through-flow groove 103 to communicate with the fourth through-flow groove 104, and the first valve element 3a disconnects the fourth through-flow groove 104 from the fifth through-flow groove 105. At this time, the second spool 3b is in the sixth position, the second spool 3b moves from left to right by an external force, the second spool 3b opens the sixth vent groove 106 to communicate the sixth vent groove 106 with the second left control chamber 1c, the second spool 3b communicates the seventh vent groove 107 with the second left control chamber 1c through the second through hole 3b2, the second spool 3b disconnects the seventh vent groove 107 from the eighth vent groove 108 and closes the fifth damping hole 3b1, the second spool 3b communicates the eighth vent groove 108 with the ninth vent groove 109, and the second spool 3b disconnects the ninth vent groove 109 from the tenth vent groove 110.

As shown in fig. 7, when the first valve body 3a is in the third position, the first valve body 3a moves from right to left by an external force, the first valve body 3a disconnects the first through-flow groove 101 from the first left control chamber 1a and connects the first through-flow groove 101 to the first through-hole 3a2, the first valve body 3a connects the second through-flow groove 102 to the third through-flow groove 103 and connects the fourth orifice 3a1 to the second through-flow groove 102, the first valve body 3a disconnects the third through-flow groove 103 from the fourth through-flow groove 104, and the first valve body 3a connects the fourth through-flow groove 104 to the fifth through-flow groove 105. At this time, the second spool 3b is in the seventh position, the second spool 3b moves from left to right by an external force, the second spool 3b opens the sixth vent groove 106 to communicate the sixth vent groove 106 with the second left control chamber 1c, the second spool 3b communicates the seventh vent groove 107 with the second left control chamber 1c through the second through hole 3b2, the second spool 3b disconnects the seventh vent groove 107 from the eighth vent groove 108 and closes the fifth orifice 3b1, the second spool 3b communicates the eighth vent groove 108 with the ninth vent groove 109, and the second spool 3b disconnects the ninth vent groove 109 from the tenth vent groove 110.

As shown in fig. 8, when the first valve body 3a is in the fourth position, the first valve body 3a moves from right to left by an external force, the first valve body 3a disconnects the first through-flow groove 101 from the first left control chamber 1a and connects the first through-flow groove 101 to the first through-hole 3a2, the first valve body 3a connects the second through-flow groove 102 to the third through-flow groove 103 and connects the fourth orifice 3a1 to the second through-flow groove 102, the first valve body 3a disconnects the third through-flow groove 103 from the fourth through-flow groove 104, and the first valve body 3a connects the fourth through-flow groove 104 to the fifth through-flow groove 105. At this time, the second spool 3b is in the eighth position, the second spool 3b moves from right to left by the external force, the second spool 3b disconnects the sixth vent groove 106 from the second left control chamber 1c and communicates the sixth vent groove 101 with the second vent hole 3b2, the second spool 3b connects the seventh vent groove 107 with the eighth vent groove 108 and communicates the fifth orifice 3b1 with the seventh vent groove 107, the second spool 3b disconnects the eighth vent groove 108 from the ninth vent groove 109, and the second spool 3b communicates the ninth vent groove 109 with the tenth vent groove 110.

The operation of the control valve according to an embodiment of the invention is described below with reference to the accompanying drawings:

for convenience of description, a hydraulic lock connected to the lift cylinder G1 and the tilt cylinder G2 by using a hydraulic principle is omitted, as shown in fig. 5, when the hydraulic lock is applied, the second port P and the first port T are respectively connected to the working port a1 and the working port B1 of the electromagnetic directional valve 10 for controlling oil supply, the third port V1 is connected to the rod chamber of the lift cylinder G1, the fourth port C1 is connected to the rodless chamber of the lift cylinder G1, the sixth port V2 is connected to the rod chamber of the tilt cylinder G2, and the fifth port C2 is connected to the rodless chamber of the tilt cylinder G2. The input end of the hydraulic pump 9 is connected with the oil tank 11, the output end of the hydraulic pump 9 is connected with the working oil port P1 of the electromagnetic directional valve 10, and the working oil port T1 of the electromagnetic directional valve 10 is connected with the oil tank 11.

When the turnover plow is in a working state and does not need to be turned over, the electromagnetic directional valve 10 is in a power-off state, the second oil port P and the first oil port T return to the T1 port through the working oil ports a1 and B1 of the electromagnetic directional valve 10 to be in an unloading state, under the combined action of the first left spring 4a and the first right spring 2a, the first valve core 3a is in a position as shown in fig. 1 to 3, and at the moment, the third through flow groove 103 is communicated with the fourth through flow groove 104, so that the second oil port P is communicated with the third oil port V1.

Under the combined action of the second left spring 4b and the second right spring 2b, the second spool 3b is in the position shown in fig. 1 to 3, and the eighth flow groove 108 is communicated with the ninth flow groove 109 and thus communicated with the sixth oil port V2.

When the turnover plow needs to be controlled to turn over, the electromagnetic directional valve 10 is electrified, the second port P is communicated with the outlet of the hydraulic pump 9, the first port T is connected with the oil tank 11, the oil at the outlet of the hydraulic pump 9 sequentially passes through the third tee flow groove 103, the fourth cross flow groove 104 and the third port V1 by the second port P and then enters the rod cavity of the lifting cylinder G1, the lifting cylinder G1 is pushed to retract, the oil in the rodless cavity of the lifting cylinder G1 acts on the first overflow valve 8 through the fourth port C1, the first overflow valve 8 is pushed to open the passage from the fourth port C1 to the fifth port C2 (equivalent to the function of a one-way valve), and thus the oil sequentially passes through the fifth port C2, the seventh through flow groove 107, the second through hole 3b2, the second left control cavity 1C, the first through hole 1h, the first left control cavity 1a and the third damping hole 1G by the fourth port C1 and returns to the first damping hole 1G, and the left control cavity is generated by the back pressure of the first damping hole 1a and the left control cavity, at this time, the movement speed of the lift cylinder G1 is slow, the back pressures of the first left control chamber 1a and the second left control chamber 1C push the first valve core 3a and the second valve core 3b to move rightward to the positions shown in fig. 6, so that the opening between the second port P and the third port V1 is larger, at this time, the oil of the fourth port C1 sequentially passes through the fifth port C2, the seventh through-flow groove 107, and the second through-hole 3b2 to reach the second left control chamber 1C, then one path of the oil of the second left control chamber 1C returns to the first port T through the first through-flow hole 1h, the first left control chamber 1a, and the first through-flow groove 101, and the other path sequentially passes through the sixth through-flow groove 106 and the first through-flow groove 101 to reach the first port T, and the retraction speed of the lift cylinder G1 is increased.

When the lift cylinder G1 retracts to the head, the pressure of the third port V1 rises rapidly, and when the pressure rises to the set pressure of the second overflow valve 7a communicated with the third port V1, the second overflow valve 7a opens, the oil enters the first right control chamber 1b through the third port V1 and the valve port of the second overflow valve 7a, and pushes the first valve spool 3a to move to the left to the position shown in fig. 7, at this time, the second overflow valve 7a is closed, but the oil of the second port P enters the first right control chamber 1b through the fourth damping hole 3a1, so that the first valve spool 3a is kept at the position shown in fig. 7; the oil of the second port P sequentially passes through the third through-flow groove 103, the second through-flow groove 102, the third through-flow hole 1j, the eighth through-flow groove 108 and the sixth port V2 and then enters the rod cavity of the turnover cylinder G2 to push the turnover cylinder G2 to retract so as to drive the turnover plow to turn upwards, the oil of the rodless cavity of the turnover cylinder G2 sequentially passes through the fifth port C2, the seventh through-flow groove 107, the second through-hole 3b2, the second left control cavity 1C, the sixth through-flow groove 106 and the first through-flow groove 101 to return to the first port T, and thus the turnover cylinder G2 continuously retracts.

When the reversing cylinder G2 retracts to the bottom, that is, the reversing plow reaches the dead point position, the pressure of the sixth port V2 rises rapidly, when the pressure rises to the set pressure of the third overflow valve 7b, the third overflow valve 7b opens, the oil enters the second right control chamber 1d to push the second valve spool 3b to move to the left to the position shown in fig. 8, at this time, the third overflow valve 7b is closed, but the oil of the second port P enters the second right control chamber 1d through the fifth damping hole 3b1 to keep the second valve spool 3b at the position shown in fig. 8; oil of the second port P sequentially passes through the third through flow groove 103, the second through flow groove 102, the third through flow hole 1j, the eighth through flow groove 108, the seventh through flow groove 107 and the fifth through flow hole C2 and then enters a rodless cavity of the turnover cylinder G2 to push the turnover cylinder G2 to extend out to drive the turnover plow to turn over downwards, the oil of a rod cavity of the turnover cylinder G2 sequentially passes through the sixth through flow hole V2, the ninth through flow groove 109, the tenth through flow groove 110, the second through hole 3b2, the second right control cavity 1d, the second damping hole 1f, the sixth through flow groove 106, the second through flow hole 1i and the first through flow groove 101 to return to the first through flow hole T, so that the turnover cylinder G2 continuously extends to drive the turnover plow to turn over downwards.

When the turnover oil cylinder G2 completely extends out, that is, the turnover plow completes the whole turnover process, the pressure of the fifth port C2 rapidly rises, when the pressure of the fifth port C2 rises to the set pressure of the first overflow valve 8, the first overflow valve 8 is opened, the oil of the second port P sequentially passes through the third through flow groove 103, the second through flow groove 102, the third through flow hole 1j, the eighth through flow groove 108, the seventh through flow groove 107 and the fourth port C1 and then enters the rodless cavity of the lifting cylinder G1 to push the lifting cylinder G1 to extend out and lower the turnover plow, the oil of the rod cavity of the lifting cylinder G1 sequentially passes through the fourth through flow groove 104, the fifth through flow groove 105, the first damping hole 1e and the first through flow groove 101 and then returns to the first T, and when the lifting cylinder G1 completely extends out, the electromagnetic directional valve 10 is powered off.

Through the above description, the driver only needs to power on/off the electromagnetic directional valve 10, and the whole processes of retracting and lifting the lifting cylinder G1, retracting and upwards overturning the overturning cylinder G2, extending and downwards overturning the overturning cylinder G2, and extending and downwards lowering the lifting cylinder G1 can be automatically and sequentially completed, so that the automation degree is high, and a complex electric control device is not needed.

The control valve according to the embodiment of the invention has the following advantages:

(1) the structure is simple, the integration level is high, the installation is convenient, and the cost is low;

(2) the lifting and overturning control can be realized automatically and sequentially only by supplying oil, the manual operation of a driver is not needed, and the automation degree is high.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although the embodiments of the present invention have been shown and described, it is understood that the embodiments are illustrative and not restrictive, and that those skilled in the art may make changes, modifications, substitutions and alterations to the embodiments without departing from the scope of the present invention.

Claims

1. A control valve, comprising:

2. The control valve of claim 1, wherein when the first spool is in the first position, the first spool closes the first vent groove, the first spool connects the second vent groove to the first left control chamber through the first through hole, the first spool disconnects the second vent groove from the third vent groove and closes the fourth damping hole, the first spool connects the third vent groove to the fourth vent groove, the first spool disconnects the fourth vent groove from the fifth vent groove, and when the second spool is in a fifth position, the second spool closes the sixth vent groove, the second spool connects the seventh vent groove to the second left control chamber through the second through hole, the second spool disconnects the seventh vent groove from the eighth vent groove and closes the fifth damping hole, the second spool communicates the eighth through-flow groove with the ninth through-flow groove, and the second spool 3b disconnects the ninth through-flow groove from the tenth through-flow groove.

3. The control valve of claim 1, wherein when the first valve spool is in the second position, the first valve spool moves from left to right under an external force, the first valve spool opens the first vent groove to communicate the first vent groove with the first left control chamber, the first valve spool connects the second vent groove with the first left control chamber through the first through hole, the first valve spool disconnects the second vent groove from the third vent groove and closes the fourth orifice, the first valve spool connects the third vent groove with the fourth vent groove, the first valve spool disconnects the fourth vent groove from the fifth vent groove, and when the second valve spool is in a sixth position, the second valve spool moves from left to right under an external force, the second valve spool opens the sixth vent groove to communicate the sixth vent groove with the second left control chamber, the second valve core enables the seventh through flow groove to be communicated with the second left control cavity through the second through hole, the second valve core breaks the connection between the seventh through flow groove and the eighth through flow groove and closes the fifth damping hole, the second valve core enables the eighth through flow groove to be communicated with the ninth through flow groove, and the second valve core breaks the connection between the ninth through flow groove and the tenth through flow groove.

4. The control valve of claim 1 wherein when the first spool is in the third position, the first spool moves from right to left under an external force, the first spool disconnects the first vent groove from the first left control chamber and communicates the first vent groove with the first through hole, the first spool disconnects the third vent groove from the third vent groove and communicates the fourth orifice with the second vent groove, the first spool disconnects the third vent groove from the fourth vent groove, the first spool connects the fourth vent groove with the fifth vent groove, the second spool is in a seventh position when the second spool moves from left to right under an external force, the second spool opens the sixth vent groove to communicate the sixth vent groove with the second left control chamber, the second valve core enables the seventh through flow groove to be communicated with the second left control cavity through the second through hole, the second valve core breaks the connection between the seventh through flow groove and the eighth through flow groove and closes the fifth damping hole, the second valve core enables the eighth through flow groove to be communicated with the ninth through flow groove, and the second valve core breaks the connection between the ninth through flow groove and the tenth through flow groove.

5. The control valve of claim 1 wherein when the first spool is in the fourth position, the first spool moves from right to left under an applied force, the first spool disconnects the first left control chamber and communicates the first vent port with the first through-hole, the first spool disconnects the second vent port with the third vent port and communicates the fourth orifice with the second vent port, the first spool disconnects the third vent port with the fourth vent port, the first spool connects the fourth vent port with the fifth vent port, the second spool is in the eighth position, the second spool moves from right to left under an applied force, the second spool disconnects the sixth vent port with the second left control chamber and communicates the sixth vent port with the second vent port, the second valve element enables the seventh through flow groove to be communicated with the eighth through flow groove and enables the fifth damping hole to be communicated with the seventh through flow groove, the second valve element disconnects the eighth through flow groove from the ninth through flow groove, and the second valve element enables the ninth through flow groove to be communicated with the tenth through flow groove.