阅读说明：本技术 一种保持阀及液压系统 (Holding valve and hydraulic system ) 是由 尹铁军 邹卫 于 2021-02-04 设计创作，主要内容包括：本发明提出了一种保持阀,包括阀块和设置于阀块上的先导控制阀、主控制阀、先导传动阀,以及溢流阀；所述主控制阀设置于所述先导控制阀的一侧,所述溢流阀设置于所述先导控制阀的另一侧,所述先导传动阀设置于所述先导控制阀的一端；所述主控制阀、先导传动阀,以及溢流阀可分别与所述先导控制阀连通；所述先导控制阀包括第二阀套和可移动地设置于所述第二阀套内的第二阀芯,所述第二阀套上设有若干油口,所述阀芯上设有若干个可与若干个所述油口连通的若干个油孔。此结构的保持阀,先导控制阀的结构简单独特,设计新颖,易于维护。总体而言,其具有结构简单、组装方便、可靠性好,以及使用成本低的优点。另一方面,本发明还提出一种包括上述保持阀的液压系统。(The invention provides a holding valve, which comprises a valve block, a pilot control valve, a main control valve, a pilot transmission valve and an overflow valve, wherein the pilot control valve, the main control valve, the pilot transmission valve and the overflow valve are arranged on the valve block; the main control valve is arranged on one side of the pilot control valve, the overflow valve is arranged on the other side of the pilot control valve, and the pilot transmission valve is arranged at one end of the pilot control valve; the main control valve, the pilot transmission valve and the overflow valve can be respectively communicated with the pilot control valve; the pilot control valve comprises a second valve sleeve and a second valve core movably arranged in the second valve sleeve, a plurality of oil ports are formed in the second valve sleeve, and a plurality of oil holes which can be communicated with the oil ports are formed in the valve core. The holding valve and the pilot control valve with the structure have the advantages of simple and unique structure, novel design and easy maintenance. Generally, the device has the advantages of simple structure, convenience in assembly, good reliability and low use cost. In another aspect, the present disclosure also provides a hydraulic system including the above-described holding valve.)

1. A holding valve is characterized by comprising a valve block, a pilot control valve, a main control valve, a pilot transmission valve and an overflow valve, wherein the pilot control valve, the main control valve, the pilot transmission valve and the overflow valve are arranged on the valve block; the main control valve is arranged on one side of the pilot control valve, the overflow valve is arranged on the other side of the pilot control valve, and the pilot transmission valve is arranged at one end of the pilot control valve;

the main control valve, the pilot transmission valve and the overflow valve can be respectively communicated with the pilot control valve;

the pilot control valve comprises a second valve sleeve and a second valve core movably arranged in the second valve sleeve, a plurality of oil ports are formed in the second valve sleeve, and a plurality of oil holes which can be communicated with the oil ports are formed in the valve core.

2. The holding valve according to claim 1, wherein a plurality of screw holes are formed in the valve block, external threads are formed on the peripheries of the main control valve, the pilot transmission valve, the overflow valve and the pilot control valve, and the main control valve, the pilot transmission valve, the overflow valve and the pilot control valve are detachably and fixedly arranged in the plurality of screw holes through the external threads.

3. The holding valve according to claim 2, wherein the valve block is further provided with an A1 oil port, an A2 oil port, a T oil port and an X oil port, the A1 oil port can be communicated with the A2 oil port, the pilot transmission valve is arranged on the X oil port, and the pilot transmission valve and the overflow valve can be respectively communicated with the T oil port.

4. The holding valve according to claim 3, wherein the valve block is provided with a first through hole and a second through hole for communicating the main control valve and the pilot control valve, and the first through hole and the second through hole are provided between the main control valve and the pilot control valve.

5. The holding valve according to claim 4, wherein the valve block is provided with a third through hole for communicating the overflow valve with the T port, and the third through hole is provided between the overflow valve and the T port.

6. The holding valve of claim 5 wherein the pilot operated valve includes a first housing and a drive rod disposed within the first housing, the drive rod having a piston disposed at one end thereof, the drive rod moving to move the piston within the first housing.

7. The holding valve as claimed in claim 6, wherein a push rod is disposed at one end of the pilot control valve close to the pilot transmission valve, one end of the push rod is abutted against the transmission rod, and the transmission rod can drive the push rod to move when moving.

8. The holding valve as claimed in claim 7, wherein a spring is further sleeved on the transmission rod, one end of the spring abuts against the piston, the other end of the spring abuts against the inner wall of the first valve housing, and the spring is compressed when the piston moves towards the push rod.

9. The holding valve of claim 8, wherein the main control valve includes a movable first spool, and during movement of the first spool, oil from the a2 port may enter the first or second port and provide pressurized oil to the pilot control valve.

10. A hydraulic system comprising a holding valve, characterized in that the holding valve is a holding valve according to any one of claims 1 to 9.

Technical Field

The invention relates to the field of hydraulic machinery, in particular to a holding valve and a hydraulic system.

Background

With the development and wide application of hydraulic technology, hydraulic systems of various structures have been widely used in various apparatuses, wherein a holding valve as an important component of the hydraulic system has been developed to several dozen types of structures.

However, the retaining valves widely used in the market at present have the problems of relatively complex structure, inconvenient assembly, relatively poor reliability, high use cost, inconvenient batch production and the like.

In summary, how to provide a retaining valve with simple structure, independent design, convenient assembly, good reliability, low use cost, and convenient mass production, and a hydraulic system including the retaining valves, has become a technical problem that needs to be solved by those skilled in the art.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the holding valve has the advantages of simple structure, independent design, convenience in assembly, good reliability, low use cost and convenience in batch production, and the hydraulic system comprising the holding valves.

The solution of the invention is realized by the following steps: the invention provides a holding valve, which comprises a valve block, a pilot control valve, a main control valve, a pilot transmission valve and an overflow valve, wherein the pilot control valve, the main control valve, the pilot transmission valve and the overflow valve are arranged on the valve block; the main control valve is arranged on one side of the pilot control valve, the overflow valve is arranged on the other side of the pilot control valve, and the pilot transmission valve is arranged at one end of the pilot control valve; the main control valve, the pilot transmission valve and the overflow valve can be respectively communicated with the pilot control valve; the pilot control valve comprises a second valve sleeve and a second valve core movably arranged in the second valve sleeve, a plurality of oil ports are formed in the second valve sleeve, and a plurality of oil holes which can be communicated with the oil ports are formed in the valve core. The retaining valve of this structure compares with the retaining valve of current structure, and every valve body on the valve piece all adopts the stand alone type design, and the equipment is comparatively convenient, when certain valve body wherein damages, direct change can, it is comparatively convenient to maintain. In addition, the pilot control valve has the advantages of simple and unique structure, novel design and easy maintenance. In general, the holding valve has the advantages of simple structure, convenient assembly, good reliability and low use cost.

The other technical scheme of the invention is that on the basis of the above, the valve block is provided with a plurality of screw holes, the peripheries of the main control valve, the pilot transmission valve, the overflow valve and the pilot control valve are all provided with external threads, and the main control valve, the pilot transmission valve, the overflow valve and the pilot control valve are detachably and fixedly arranged in the plurality of screw holes through the external threads.

On the basis, the other technical scheme of the invention is that an A1 oil port, an A2 oil port, a T oil port and an X oil port are further arranged on the valve block, the A1 oil port can be communicated with the A2 oil port, the pilot transmission valve is arranged on the X oil port, and the pilot transmission valve and the overflow valve can be respectively communicated with the T oil port.

In another technical solution of the present invention, on the basis of the above, the valve block is provided with a first through hole and a second through hole for communicating the main control valve and the pilot control valve, and the first through hole and the second through hole are provided between the main control valve and the pilot control valve.

On the basis, the other technical scheme of the invention is that a third through hole for communicating the overflow valve with the T oil port is formed in the valve block, and the third through hole is formed between the overflow valve and the T oil port.

On the basis, the pilot transmission valve comprises a first valve sleeve and a transmission rod arranged in the first valve sleeve, a piston is arranged at one end of the transmission rod, and the transmission rod drives the piston to move in the first valve sleeve when moving.

On the basis, one end of the pilot control valve close to the pilot transmission valve is provided with a push rod, one end of the push rod is abutted against the transmission rod, and the push rod can be driven to move when the transmission rod moves.

In another technical scheme of the present invention, on the basis of the above, a spring is further sleeved on the transmission rod, one end of the spring abuts against the piston, the other end of the spring abuts against the inner wall of the first valve housing, and the spring can be compressed when the piston moves towards the direction of the push rod.

In addition to the above, the main control valve includes a movable first valve spool, and during movement of the first valve spool, oil from the a2 oil port may enter the first through hole or the second through hole and provide pressure oil to the pilot control valve.

In another aspect, the present disclosure also provides a hydraulic system including a holding valve as described above.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention.

FIG. 1 is a schematic view of a retaining valve according to the present invention;

FIG. 2 is a schematic diagram of the pilot operated valve of FIG. 1;

FIG. 3 is a schematic diagram of the pilot control valve of FIG. 1;

fig. 4 is a schematic diagram of the operation of a holding valve of the present invention.

The corresponding relation of the reference signs is as follows:

1 valve block 2 main control valve 3 pilot control valve

4 overflow valve 5 ejector pin 6 pilot transmission valve

7 first joint 8 second joint 9 piston

10 transmission rod 11 spring 12 first valve sleeve

13 first chamber 14 first through hole 15 second through hole

16 second volume 17 third volume 18 third through hole

19 first spool 20 second spool 21 second valve housing

22 first oil hole 23 second oil hole 24 third oil hole

25 first port 26 second port 27 third port

Detailed Description

The present invention will now be described in detail with reference to the drawings, which are given by way of illustration and explanation only and should not be construed to limit the scope of the present invention in any way. Furthermore, features from embodiments in this document and from different embodiments may be combined accordingly by a person skilled in the art from the description in this document.

In the following embodiments of the present invention, please refer to the structure of the holding valve shown in fig. 1 to 4 and the working principle thereof, the holding valve includes a valve block 1, a pilot control valve 3, a main control valve 2, a pilot transmission valve 6, and an overflow valve 4, the main control valve 2 is disposed on one side of the pilot control valve 3, i.e., on the left side shown in fig. 1, the overflow valve 4 is disposed on the other side of the pilot control valve 3, i.e., on the other side shown in the drawings, the pilot transmission valve 6 is disposed on one end of the pilot control valve 3, i.e., on the upper end shown in the drawings, and the main control valve 2, the pilot transmission valve 6, and the overflow valve 4 can be respectively communicated with the pilot control valve 3, i.e., under a predetermined condition. The pilot control valve 3 includes a second valve sleeve 21 and a second valve core 20 movably disposed in the second valve sleeve 21, the second valve sleeve 21 is provided with a plurality of oil ports, and the second valve core 20 is provided with a plurality of oil holes capable of being communicated with the plurality of oil ports. More specifically, as shown in fig. 3, the oil ports include a first oil port 25, a second oil port 26 and a third oil port 27, the first oil port 25 is disposed at the top end of the second valve housing 21, and the second oil port 26 and the third oil port 27 are disposed at intervals on the wall of the second valve housing 21. The oil holes include a first oil hole 22, a second oil hole 23 and a third oil hole 24, the first oil hole 22, the second oil hole 23 and the third oil hole 24 are arranged at intervals, and under specific conditions, a first oil hole 25, a second oil hole 26 and a third oil hole 27 can be respectively communicated with the first oil hole 22, the second oil hole 23 and the third oil hole 24, so that reversing of the pilot control valve is realized. The retaining valve of this structure compares with the retaining valve of current structure, and every valve body on the valve piece 1 all adopts the stand alone type design, and the equipment is comparatively convenient, when certain valve body wherein damages, direct change can, it is comparatively convenient to maintain. In addition, the pilot control valve 3 has a simple and unique structure, a novel design and easy maintenance. In general, the holding valve has the advantages of simple structure, convenient assembly, good reliability and low use cost.

On the basis of the above embodiment, in another embodiment of the present invention, as shown in fig. 1, a plurality of screw holes are formed in a valve block 1, external threads are formed on the peripheries of a main control valve 2, a pilot transmission valve 6, an overflow valve 4, and a pilot control valve 3, and the main control valve 2, the pilot transmission valve 6, the overflow valve 4, and the pilot control valve 3 are detachably and fixedly disposed in the plurality of screw holes through the external threads, that is, the split independent arrangement is adopted. In addition, in order to ensure the sealing performance between each valve body and the valve block 1 and prevent oil leakage, a plurality of groups of sealing components are arranged on the periphery of each valve body.

On the basis of the above embodiment, in another embodiment of the present invention, as shown in fig. 1 to 4, the valve block 1 is further provided with an a1 oil port, an a2 oil port, a T oil port and an X oil port, the T oil port is an oil return port, the a1 oil port can be communicated with the a2 oil port, the pilot transmission valve 6 is disposed on the X oil port, and the pilot transmission valve 6 and the overflow valve 4 can be respectively communicated with the T oil port.

On the basis of the above embodiment, in another embodiment of the present invention, as shown in fig. 1, a first through hole 14 and a second through hole 15 for communicating the main control valve 2 and the pilot control valve 3 are formed in the valve block 1, the first through hole 14 and the second through hole 15 are formed between the main control valve 2 and the pilot control valve 3, and the first through hole 14 and the second through hole 15 are arranged in parallel, so that during operation, oil pressure can enter the pilot control valve 3 from the main control valve 2 through the first through hole 14 and the second through hole 15. In addition, a first containing cavity 13 is further arranged between the first through hole 14 and the main control valve 2, and oil in the main control valve 2 enters the first through hole 14 through the first containing cavity 13.

On the basis of the above embodiment, in another embodiment of the present invention, as shown in fig. 1, a third through hole 18 for communicating the overflow valve 4 and the T port is formed in the valve block 1, the third through hole 18 is formed between the overflow valve 4 and the T port, and during the operation, the turbulent flow can enter the T port from the overflow valve 4 through the third through hole 18, that is, the overflow valve 4 is depressurized and then flows back to the oil tank.

In another embodiment of the present invention based on the above embodiment, as shown in fig. 1 and 2, the pilot transmission valve 6 includes a first valve housing 12 and a transmission rod 10 disposed in the first valve housing 12, one end, i.e., the upper end shown in the figure, of the transmission rod 10 is provided with a piston 9, and when the transmission rod 10 moves up and down, the piston 9 is driven to move up and down in the first valve housing 12. In addition, the pilot transmission valve 6 is also provided with a first joint 7 and a second joint 8, the first joint 7 is a filter screen joint, and the second joint 8 is a transition joint.

On the basis of the above embodiment, in another embodiment of the present invention, as shown in fig. 1, one end of the pilot control valve 3 close to the pilot transmission valve 6, i.e. the upper end shown in the figure, is provided with a push rod 5, one end of the push rod 5, i.e. the upper end shown in the figure, abuts against the transmission rod 10, the transmission rod 10 can move up and down under the action of oil, and then drives the push rod 5 to move, and after the push rod 5 moves, drives the second valve spool 20 in the pilot control valve 3 to move, and when the second valve spool 20 moves, the direction change is further realized. In addition, a third cavity 17 is arranged between the lower end of the mandril 5 and the upper end of the pilot control valve 3.

On the basis of the above embodiment, in another embodiment of the present invention, as shown in fig. 2, a spring 11 is further sleeved on the transmission rod 10, one end, i.e., the upper end shown in the figure, of the spring 11 abuts against the piston 9, and the other end, i.e., the lower end shown in the figure, abuts against the inner wall of the first valve housing 12, when the piston 9 moves towards the push rod 5, i.e., downward, the spring 11 is compressed, and then the transmission rod 10 is reset under the action of the spring 11.

In another embodiment of the present invention, based on the above embodiment, as shown in fig. 1, the main control valve 2 includes a movable first spool 19, and during the movement of the first spool 19, the oil from the a2 oil port can enter the first through hole 14 or the second through hole 15 and provide the pressure oil to the pilot control valve 3. In addition, the lower end of the first valve core 19 is further provided with a second cavity 16, and a return spring is further arranged in the second cavity 16.

As for the pilot-controlled valve 3,

the retaining valve with the structure works according to the following principle:

when in normal position: pressure oil of an A2 oil port enters the pilot control valve 33 from the first containing cavity 13 through the first through hole 14, when the pilot control valve 3 is in a normal position, the corresponding first through hole 14 and the second through hole 15 are conducted, meanwhile, the conduction between the pilot control valve and the third containing cavity 17 is cut off, then the pressure oil flows into the second containing cavity 16 through the second through hole 15, and simultaneously, the pressure oil is communicated with an oil inlet of the overflow valve 4, and because the acting area of the pressure oil of the second containing cavity 16 on the main control valve 2 is larger than the reaction of the pressure oil of the first containing cavity 13 on the main control valve 2, the first valve core 19 in the main control valve 2 is always in a state of cutting off the communication between an A2 oil port and an A1 oil port, so that the state; when the pressure oil rises to exceed the set pressure of the relief valve 4, the relief valve 4 performs relief and the pressure oil returns to the T port from the third through hole 18.

During reversing: the control oil enters the pilot transmission valve 6 from the X oil port (specifically, firstly passes through the joint, and then passes through the action area of the piston 9 to transmit the hydraulic pressure to the transmission rod 10), the pilot transmission valve 6 acts on the ejector rod 5, the ejector rod 5 reverses the pilot control valve 3 (at this moment, the pilot control valve 3 seals the oil of the first through hole 14, the second through hole 15 is communicated with the third accommodating cavity 17), and the second accommodating cavity 16 is communicated with the third accommodating cavity 17 through the second through hole 15 and returns to the T oil port. The pressure oil in the second cavity 16 is unloaded, no pressure oil acts on the second valve core 20 in the main control valve 2, the pressure oil in the first cavity 13 acts on the first valve core 19 to push the first valve core 19 open, the oil port A2 is communicated with the oil port A1, and finally the reversing is realized.

The holding valve of above-mentioned structure, as before, compare with the holding valve of current structure, because every valve body on the valve piece 1 all adopts the stand alone type design, the equipment is comparatively convenient, when certain valve body wherein damages, direct change can, it is comparatively convenient to maintain. Generally, the device has the advantages of simple structure, convenience in assembly, good reliability and low use cost.

Furthermore, the invention also proposes a hydraulic system comprising a holding valve, in particular a holding valve as described above.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.