阅读说明：本技术 一种依靠液压缸油口位置控制液压缸动作顺序的控制系统 (Control system for controlling action sequence of hydraulic cylinder by means of hydraulic cylinder oil port position ) 是由 马强维 陈世龙 陆勇建 张建 于 2019-10-21 设计创作，主要内容包括：本发明提供了一种液压缸动作顺序的控制系统,包括换向阀,第一液压缸、第二液压缸,第一液控单向阀和第二液控单向阀,所述的第一液压缸上设置有第一油口、第二油口,以及设置于第一油口与第二油口之间的第三油口,所述的第二液压缸上设置有第一油口、第二油口,以及设置于第一油口与第二油口的第三油口。本发明通过在液压缸增加油口,实现液压缸之间动作的顺序关系,本发明提供的液压控制系统结构简单,连接方便,有效避免了因顺序阀带来的不稳定性,能够有效提高液缸动作位置的准确性,在带有顺序控制的机构中具有良好的适用性。(The invention provides a control system for the action sequence of hydraulic cylinders, which comprises a reversing valve, a first hydraulic cylinder, a second hydraulic cylinder, a first hydraulic control one-way valve and a second hydraulic control one-way valve, wherein the first hydraulic cylinder is provided with a first oil port, a second oil port and a third oil port arranged between the first oil port and the second oil port, and the second hydraulic cylinder is provided with a first oil port, a second oil port and a third oil port arranged between the first oil port and the second oil port. The hydraulic control system provided by the invention has the advantages that the hydraulic oil ports are additionally arranged on the hydraulic cylinders, the sequential relation of the actions of the hydraulic cylinders is realized, the hydraulic control system is simple in structure and convenient to connect, the instability caused by the sequential valve is effectively avoided, the accuracy of the action position of the hydraulic cylinders can be effectively improved, and the hydraulic control system has good applicability in a mechanism with sequential control.)

1. The utility model provides a control system of pneumatic cylinder action sequence, includes switching-over valve (1), first pneumatic cylinder (2), second pneumatic cylinder (4), first liquid accuse check valve (3) and second liquid accuse check valve (5), its characterized in that: the hydraulic cylinder is characterized in that the first hydraulic cylinder (2) is provided with a first oil port (21), a second oil port (22) and a third oil port (23) arranged between the first oil port and the second oil port, and the second hydraulic cylinder (4) is provided with a first oil port (41), a second oil port (42) and a third oil port (43) arranged between the first oil port (41) and the second oil port (42).

2. The control system for the sequence of hydraulic cylinder actuations of claim 1, wherein: a first oil port (11) of the reversing valve (1) is communicated with a first oil port (21) of the first hydraulic cylinder (2); the third oil port (23) of the first hydraulic cylinder (2) is communicated with the first oil port (41) of the second hydraulic cylinder (4), and a first hydraulic control one-way valve (3) is arranged between the communicating pipelines.

3. The control system for the sequence of actions of hydraulic cylinders according to claim 1 or 2, characterized in that: and a first oil port (41) of the second hydraulic cylinder (4) is communicated with a first outlet (11) of the reversing valve (1) through a first hydraulic control one-way valve (3).

4. The control system for the sequence of hydraulic cylinder actuations of claim 1, wherein: the flow direction of the first hydraulic control one-way valve (3) is from the first outlet (11) to the first oil port (41).

5. The control system for the sequence of actions of hydraulic cylinders according to claim 1 or 2, characterized in that: the second outlet (12) of the reversing valve (1) is communicated with the second oil port (42) of the second hydraulic cylinder (4), the third oil port (43) of the second hydraulic cylinder (4) is communicated with the second oil port (22) of the first hydraulic cylinder (2), and a second hydraulic control one-way valve (5) is arranged between the communicating pipelines.

6. The control system for the sequence of actions of hydraulic cylinders according to claim 1 or 5, characterized in that: and the second oil port (22) of the first hydraulic cylinder (2) is communicated with the second outlet (12) of the reversing valve (1) through a second hydraulic control one-way valve (5).

7. The control system for the sequence of hydraulic cylinder actuations of claim 1, wherein: the flow direction of the second hydraulic control one-way valve (5) is from the second outlet (12) to the second oil port (22).

8. The control system for the sequence of hydraulic cylinder actuations of claim 1, wherein: the first oil port (21) and the second oil port (22) are respectively positioned at two ends of the first hydraulic cylinder (2).

9. The control system for the sequence of hydraulic cylinder actuations of claim 1, wherein: the first oil port (41) and the second oil port (42) are respectively positioned at two ends of the second hydraulic cylinder (4).

10. The control system for the sequence of hydraulic cylinder actuations of claim 1, wherein: the reversing valve is used for changing an oil inlet passage and reversing and controlling the extension and retraction of a piston rod of the hydraulic cylinder; the reversing valve is selected from a manual reversing valve or an electromagnetic reversing valve.

Technical Field

The invention belongs to the technical field of hydraulic pressure, and relates to a control system for controlling the action sequence of a hydraulic cylinder by depending on the position of an oil port of the hydraulic cylinder.

Background

In the prior art, sequence valves are mostly adopted to control the sequence control process of hydraulic cylinders. When the sequence valve is used for control, the opening of the sequence valve is controlled by the pressure of a hydraulic system, and once the pressure is reached, the sequence valve is opened. Under the condition that a piston of one hydraulic cylinder is blocked, when the pressure of the sequence valve reaches a set value, the other hydraulic cylinder can act, sequence disorder is easily caused, and misoperation is caused.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a control system for controlling the action sequence of a hydraulic cylinder.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a control system of control pneumatic cylinder action sequence, includes switching-over valve, first pneumatic cylinder, second pneumatic cylinder, first hydraulically controlled check valve and second hydraulically controlled check valve, wherein: the first hydraulic cylinder is provided with a first oil port and a second oil port of the first hydraulic cylinder, and a third oil port arranged between the first oil port and the second oil port, and the second hydraulic cylinder 4 is provided with a first oil port and a second oil port of the second hydraulic cylinder, and a third oil port arranged between the first oil port and the second oil port.

The invention is further preferred:

a first outlet of the reversing valve is communicated with a first oil port of the first hydraulic cylinder; a third oil port of the first hydraulic cylinder is communicated with a first oil port of the second hydraulic cylinder, and a first hydraulic control one-way valve is arranged between the communicating pipelines; and a first oil port of the second hydraulic cylinder is communicated with a first outlet of the reversing valve through a first hydraulic control one-way valve.

The flow direction of the first hydraulic control one-way valve is from the first outlet to the first oil port of the second hydraulic cylinder.

A second outlet of the reversing valve is communicated with a second oil port of the second hydraulic cylinder; a third oil port of the second hydraulic cylinder is communicated with a second oil port 22 of the first hydraulic cylinder, and a second hydraulic control one-way valve is arranged between the communicating pipelines; and the second hydraulic oil port of the first hydraulic cylinder is communicated with the second outlet of the reversing valve through a hydraulic control one-way valve.

The flow direction of the second hydraulic control one-way valve is from the second outlet to the second oil port of the first hydraulic cylinder.

The first oil port and the second oil port of the first hydraulic cylinder are respectively positioned at two ends of the first hydraulic cylinder.

And the first oil port and the second oil port of the second hydraulic cylinder are respectively positioned at two ends of the second hydraulic cylinder. The reversing valve is used for changing an oil inlet passage and reversing and controlling the extension and retraction of a piston rod of the hydraulic cylinder; the reversing valve is selected from a manual reversing valve or an electromagnetic reversing valve.

The working principle of the hydraulic control system provided by the invention is as follows:

when the hydraulic cylinder retracts, that is, when the first hydraulic cylinder piston retracts to the third oil port of the first hydraulic cylinder, hydraulic oil flows from the third oil port of the first hydraulic cylinder to the first hydraulic control one-way valve, the first hydraulic control one-way valve is opened, hydraulic oil at the first outlet of the reversing valve 1 enters the first oil port of the second hydraulic cylinder from the first hydraulic control one-way valve through which the first fork passes, and the piston of the second hydraulic cylinder starts to retract. The hydraulic oil in the second oil port of the first hydraulic cylinder is communicated with the second outlet of the reversing valve through a hydraulic control one-way valve, and the hydraulic oil in the first hydraulic cylinder is communicated with the second outlet of the reversing valve through the second one-way valve and flows back to the reversing valve; the second hydraulic cylinder has a second port directly connected to the second outlet of the directional control valve, so that the distance L1 between the first and third ports of the first hydraulic cylinder can be designed according to the control sequence.

Extending a hydraulic cylinder: the second export of switching-over valve and the second hydraulic fluid port intercommunication of second pneumatic cylinder, be equipped with the second hydraulic control check valve between the third hydraulic fluid port of second pneumatic cylinder and the intercommunication pipeline of the second hydraulic fluid port of first pneumatic cylinder, when the second pneumatic cylinder piston stretches out the third hydraulic fluid port of second pneumatic cylinder, hydraulic oil flows to the second hydraulic control check valve from the third hydraulic fluid port of second pneumatic cylinder, open the second hydraulic control check valve, the second hydraulic fluid port that the hydraulic oil of the second export mouth of switching-over valve passes through the hydraulic control check valve from the second fork and gets into first pneumatic cylinder, first pneumatic cylinder piston begins to stretch out, the first hydraulic fluid port hydraulic oil of second pneumatic cylinder communicate through the first export of first hydraulic control check valve and switching-over valve: hydraulic oil in the second hydraulic cylinder is communicated with a first outlet of the reversing valve through a first hydraulic control one-way valve and flows back to the reversing valve; and a first oil port of the first hydraulic cylinder is directly communicated with a first outlet of the reversing valve. Wherein L1 is the distance between the first port and the second port; l2 is the distance between the second oil port and the third oil port; when the first outlet of the electromagnetic directional valve is filled with oil, the oil filling time of the first outlet of the second hydraulic cylinder can be controlled by the distance L1 in the first hydraulic cylinder, namely when the piston of the first hydraulic cylinder retracts to the position of the third oil port of the first hydraulic cylinder, the first oil port of the second hydraulic cylinder is filled with oil, and the piston rod of the second hydraulic cylinder begins to retract; when the oil enters the second outlet of the electromagnetic directional valve, the oil entering time of the second outlet of the first hydraulic cylinder can be controlled by the distance L2 in the second hydraulic cylinder, namely when the piston of the second hydraulic cylinder extends to the position L2, the oil enters the second oil port of the first hydraulic cylinder, and the piston rod of the first hydraulic cylinder begins to extend. The distance L2 between the second and third ports of the second hydraulic cylinder can be designed according to the timing of the control sequence during the sequence control process.

The invention has the following beneficial effects:

according to the invention, the third oil port is added to the conventional hydraulic cylinder, so that the sequence relation of the actions of the hydraulic cylinders is realized, the instability caused by the sequence valve is effectively avoided, and the accuracy of the action position of the hydraulic cylinder can be effectively improved. The control system provided by the invention has the advantages of simple and stable structure and convenience in operation.

Drawings

Fig. 1 is a schematic diagram of a hydraulic control system according to an exemplary embodiment of the present invention.

FIG. 2 is a schematic illustration of retraction of a cylinder piston in a hydraulic control system in accordance with an exemplary embodiment of the present invention.

FIG. 3 is a schematic illustration of the extension of the piston of the hydraulic cylinder in an example embodiment of the invention.

Description of reference numerals:

1, 2 a reversing valve, 2 a first hydraulic cylinder,

3 a first hydraulic control one-way valve and 4 a second hydraulic cylinder.

5 a second hydraulic control one-way valve;

21 a first oil port, 22 a second oil port,

23, a third oil port, 24 a first piston,

41 a fourth port, 43 a fifth port,

43 a sixth oil port, 44, a second piston;

11 a first outlet, 12 a second outlet;

13 a first fork and 14 a second fork.

Detailed Description

The invention will be further illustrated with reference to the following specific examples.

The hydraulic cylinder in the prior art generally has only two oil ports, and a sequence valve is mostly adopted for control in the sequence control process of the hydraulic cylinder in a hydraulic system. Since the sequence valve opening is controlled by the pressure of the hydraulic system, the sequence valve will open once the pressure is reached. Under the condition that a piston of one hydraulic cylinder is blocked, when the pressure of the sequence valve reaches a set value, the other hydraulic cylinder can act, sequence disorder is easily caused, and misoperation is caused. Compared with the prior art, the hydraulic cylinder has the advantages that the hydraulic cylinder is additionally provided with the oil port, various inconveniences caused by design of a control valve or a sequence valve are effectively solved, the sequence relation of actions among the hydraulic cylinders is realized, the hydraulic cylinder is simple in structure and convenient to connect, instability caused by the sequence valve is effectively avoided, the accuracy of the action position of the hydraulic cylinder can be effectively improved, and the hydraulic cylinder has good applicability in a mechanism with sequence control.

The invention is further illustrated below with reference to the figures and examples.

In an exemplary embodiment of the present invention (as shown in fig. 1), a control system for controlling the operation sequence of hydraulic cylinders comprises a directional control valve 1, a first hydraulic cylinder 2, a second hydraulic cylinder 4, a first pilot-operated check valve 3 and a second pilot-operated check valve 5, wherein: the first hydraulic cylinder 2 is provided with a first port 21, a second port 22, and a third port 23 disposed between the first port and the second port, and the second hydraulic cylinder 4 is provided with a first port 41, a second port 42, and a third port 43 disposed between the first port 41 and the second port 42.

In a preferred embodiment of the present invention (as shown in fig. 2), the first outlet 11 of the directional control valve 1 is communicated with the first oil port 21 of the first hydraulic cylinder 2, the third oil port 23 of the first hydraulic cylinder 2 is communicated with the first oil port 41 of the second hydraulic cylinder 4, and the pilot-controlled check valve 3 is arranged between the communication pipelines; the first oil port 41 of the second hydraulic cylinder 4 is communicated with the first outlet 11 of the reversing valve 1 through the pilot operated check valve 3.

In a preferred embodiment of the present invention, the pilot operated check valve 3 flows toward the first outlet 11 to the first port 41.

In a preferred embodiment of the present invention (as shown in fig. 3), the second outlet 12 of the directional control valve 1 is communicated with the second oil port 42 of the second hydraulic cylinder 4, the third oil port 43 of the second hydraulic cylinder 4 is communicated with the second oil port 22 of the first hydraulic cylinder 2, and the pilot-controlled check valve 5 is arranged between the communication pipelines; the second oil port 22 of the first hydraulic cylinder 2 is communicated with the second outlet 12 of the reversing valve 1 through the hydraulic control one-way valve 5.

In a preferred embodiment of the present invention, the pilot operated check valve 5 flows toward the second outlet 12 to the second port 22.

In a preferred embodiment of the present invention, the first and second ports 21 and 22 are respectively located at both ends of the first hydraulic cylinder 2.

In a preferred embodiment of the present invention, the first and second oil ports 41 and 42 are respectively located at both ends of the second hydraulic cylinder 3.

In a preferred embodiment of the invention, the reversing valve is used for changing an oil inlet path and reversing and controlling the extension and retraction of a piston rod of the hydraulic cylinder; the reversing valve is selected from a manual reversing valve or an electromagnetic reversing valve.

In a preferred embodiment of the present invention, when the piston of the hydraulic cylinder is retracted (as shown in fig. 2), the first outlet 11 of the directional control valve 1 is communicated with the first port 21 of the first hydraulic cylinder 2 through the first branch 13, and the pilot operated check valve 3 is disposed between the communication lines of the third port 23 of the first hydraulic cylinder 2 and the first port 41 of the second hydraulic cylinder 4. When the first piston 24 of the first hydraulic cylinder 2 retracts to the third oil port 23 of the first hydraulic cylinder 2, the hydraulic oil flows from the third oil port 23 of the first hydraulic cylinder 2 to the pilot operated check valve 3, the pilot operated check valve 3 is opened, the hydraulic oil at the first outlet 11 of the reversing valve 1 passes through the first fork 13 from the 11 point, enters the first oil port 41 of the second hydraulic cylinder 4 through the pilot operated check valve 3, and the piston of the second hydraulic cylinder 4 starts to retract.

When the piston of the hydraulic cylinder extends (as shown in fig. 3), the second outlet 12 of the directional control valve 1 is communicated with the second oil port 42 of the second hydraulic cylinder 4 through the second fork 14, a pilot operated check valve 5 is arranged between the communication pipelines of the third oil port 43 of the second hydraulic cylinder 4 and the second oil port 42 of the first hydraulic cylinder 2, when the second piston 44 of the second hydraulic cylinder 4 extends out of the third oil port 43 of the second hydraulic cylinder 4, hydraulic oil flows from the third oil port 43 of the second hydraulic cylinder 4 to the pilot operated check valve 5, the pilot operated check valve 5 is opened, hydraulic oil at the second outlet 12 of the reversing valve 1 enters the second oil port 22 of the first hydraulic cylinder 2 from the 12 point through the pilot operated check valve 5, the piston of the first hydraulic cylinder 2 starts to extend out, hydraulic oil at the first oil port 41 of the second hydraulic cylinder 4 is communicated with the 11 th port of the reversing valve 1 through the pilot operated check valve 3, and the first oil port 21 of the first hydraulic cylinder 2 is directly communicated with the first outlet 11 of the reversing valve 1 through the first fork.

When the piston of the first hydraulic cylinder 2 retracts, the hydraulic oil of the third oil port 23 of the first hydraulic cylinder 2 only opens the pilot operated check valve 3, 11 points of hydraulic oil pass through the first oil port 41 reaching the second hydraulic cylinder 4 from the pilot operated check valve 3, the hydraulic oil of the third oil port 23 of the first hydraulic cylinder 2 only plays a role in opening the check valve 3, and the hydraulic oil of the third oil port 23 of the first hydraulic cylinder 2 cannot flow into the pipelines of the 11 points and the first oil port 41 of the second hydraulic cylinder 4.

When the piston of the second hydraulic cylinder 4 extends, the hydraulic oil of the third oil port 43 in the hydraulic cylinder 4 only opens the pilot operated check valve 5, so that 12 points of hydraulic oil pass through the second oil port 22 of the first hydraulic cylinder 2 from the pilot operated check valve 5, the hydraulic oil of the third oil port 43 of the second hydraulic cylinder 4 only plays a role in opening the check valve 5, and the hydraulic oil of the third oil port 43 of the second hydraulic cylinder 4 cannot flow into the 12 points and the second oil port 22 pipeline of the first hydraulic cylinder 2. In the above embodiments, the total inlet of the oil path in the reversing valve 1 is a port P, and the total outlet is a port T all the time.

The embodiments described above are intended to facilitate one of ordinary skill in the art in understanding and using the present invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the embodiments described herein, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.