CN113983017B

CN113983017B - Multi-way valve reversing linkage and hydraulic system

Info

Publication number: CN113983017B
Application number: CN202111181987.8A
Authority: CN
Inventors: 罗炎热; 周启迪; 蒋淋
Original assignee: Changde Zhonglian Zhongke Hydraulic Co ltd
Current assignee: Changde Zhonglian Zhongke Hydraulic Co ltd
Priority date: 2021-10-11
Filing date: 2021-10-11
Publication date: 2022-11-04
Anticipated expiration: 2041-10-11
Also published as: CN113983017A

Abstract

The invention relates to a hydraulic valve, and discloses a multi-way valve reversing linkage which comprises a valve body and a valve structure arranged in the valve body, wherein the valve structure comprises a main valve structure, a compensation valve structure, a retaining valve structure and a retaining pilot valve structure, the main valve structure comprises a main valve rod and a main valve cavity, the main valve rod is arranged in the main valve cavity and can move in the main valve cavity under the control of hydraulic oil of a first control oil port and a second control oil port so as to switch the communication state between the first working oil port and the second working oil port and between an oil inlet and an oil return port, the compensation valve structure is connected with the main valve structure so as to perform pressure compensation on the hydraulic oil output by the main valve structure, and the retaining valve structure is connected with the first working oil port, the main valve structure and the retaining pilot valve structure so as to block an oil path between the first working oil port and the main valve structure under the control of retaining pilot valve structure. Has the advantages of compact structure and less external oil circuit. The invention also provides a hydraulic system.

Description

Multi-way valve reversing linkage and hydraulic system

Technical Field

The invention relates to a hydraulic valve, in particular to a multi-way valve reversing linkage. In addition, the invention also relates to a hydraulic system.

Background

In a hydraulic system, the elements used to control or regulate the flow direction, pressure and flow of hydraulic oil are collectively referred to as hydraulic valves. The hydraulic valve is widely applied to a hydraulic system, and the multiway valve is a hydraulic valve for controlling the flow direction of hydraulic oil and is commonly used for controlling the movement direction of a hydraulic actuator in the hydraulic system.

The multi-way valve of small engineering machinery usually adopts a plate type structure, and a reversing link for controlling single action is combined in parallel or series connection and the like to realize the control of independent or composite action of a plurality of actuating mechanisms. Some of the reversing links for controlling single action have extremely high leakage requirements because the controlled load of the reversing links has a neutral load holding function, and in the common reversing links, a valve body and a valve core are matched to form a slide valve sealing structure, so that the leakage requirements cannot be met. In order to solve the leakage problem, a holding valve is usually installed between the oil cylinder and the main valve core, and the oil path between the main valve core and the oil cylinder is cut off by the cone seal of the holding valve, so as to prevent the internal leakage.

An existing multi-way valve reversing linkage with a holding valve is shown in fig. 1, and the existing multi-way valve reversing linkage mainly comprises a valve body 9, a main valve core 10, an overflow valve 11, an end cover 12, a main valve core return spring 13, a one-way valve 14, a compensation valve 15, a holding valve and the like, wherein the holding valve is provided with a two-stage structure of a holding main valve and a holding pilot control valve, the holding main valve mainly comprises a1 holding valve core, a 2 holding valve core return spring and a 3 holding valve positioning plug, and the holding pilot valve mainly comprises a 4 pilot valve plug, a 5 pilot valve core return spring, a 6 pilot valve core and a 7 pilot valve sleeve. The working principle of the multi-way valve reversing linkage is as follows: the main valve element 10 controls the movement direction of the actuator under the action of pilot signals pa1 and pb 1; the overflow valve 11 plays a role of overload protection; the check valve 14 prevents the oil from flowing backwards; the compensating valve 15 maintains the front-back pressure difference of the main valve core 10 unchanged, so that the movement speed of the actuator is only controlled by the opening area of the main valve core. When the reversing valve is in the middle position, oil passages among P, A, B and T are cut off by the main valve element 10, meanwhile, the cone seal between the valve element 1 and the valve body 9 is kept to block oil from leaking from a load port B to the main valve element 10, and the load is kept static in the middle position; when pa1 is signaled, the main valve element 10 moves to the left, the valve element 1 is kept to be opened in the positive direction, oil paths between P and A, and oil paths between B and T are communicated, and the load rises; when pb1 signal is given, a signal of a pilot valve control oil port is given at the same time, the main valve core 10 moves rightwards, the pilot valve is kept to reverse, the pilot valve is made to open reversely, oil paths between P and B, and between A and T are communicated, and the load is lowered.

The multi-way valve reversing linkage has the following defects: (1) The retaining pilot valve in the multi-way valve reversing linkage is arranged on the valve body through a screw, and due to the fact that the installation space of the small mechanical multi-way valve is limited, the overall size of the multi-way valve is increased by externally connecting the retaining valve, the limited assembly space is occupied, and the installation difficulty is increased; (2) The pilot valve control oil port and the pilot valve oil drain port are externally connected with oil liquid through the oil pipe, so that an external oil path of the multi-way valve is messy, and the prior assembly and the later maintenance are not facilitated; (3) The pilot valve is kept to adopt a structure of a valve core and a valve sleeve, so that the pilot valve is complex in structure, high in production cost and poor in structural stability.

Disclosure of Invention

The invention aims to solve the technical problem of providing a multi-way valve reversing connection which is compact in structure and few in external oil way.

The invention further aims to solve the technical problem of providing a hydraulic system which can keep the middle position of a hydraulic actuating mechanism, has a compact structure and has few external oil paths.

In order to solve the technical problems, the present invention provides a multi-way valve reversing linkage, including a valve body and a valve structure disposed in the valve body, wherein the valve body is provided with an oil inlet, an oil return port, a first working oil port, a second working oil port, a first control oil port and a second control oil port, which are connected to each other, the valve structure includes a main valve structure, a compensation valve structure, a maintenance valve structure and a maintenance pilot valve structure, the main valve structure includes a main valve rod and a main valve cavity, the main valve rod is disposed in the main valve cavity and is capable of moving in the main valve cavity under the control of hydraulic oil from the first control oil port and the second control oil port to switch the communication state between the first working oil port and the second working oil port and the oil inlet and the oil return port, the compensation valve structure is connected to the main valve structure to perform pressure compensation on hydraulic oil output through the main valve structure, and the maintenance valve structure is connected to the first working oil port, the main valve structure and the maintenance pilot valve structure to block an oil path between the first working oil port and the main valve structure under the control of the maintenance pilot valve structure.

Preferably, the main valve cavity includes a control cavity, a first oil return cavity, a first working cavity, a first pressure compensation cavity, a pressure cavity, a second pressure compensation cavity, a third pressure compensation cavity, a second working cavity, a second oil return cavity and a spring cavity, the control cavity is connected to the first control oil port, the first oil return cavity and the second oil return cavity are both connected to the oil return port, the first working cavity is connected to the holding valve structure, the first pressure compensation cavity, the second pressure compensation cavity and the third pressure compensation cavity are all connected to the compensation valve structure, the pressure cavity is connected to the oil inlet, the second working cavity is connected to the second working oil port, the spring cavity is connected to the second control oil port, and the main valve rod can move in the main valve cavity, when the main valve rod is in the first working position, the first working cavity is communicated with the first pressure compensation cavity, the pressure cavity is communicated with the second pressure compensation cavity, the second working cavity is communicated with the second oil return cavity, when the main valve rod is in the second working position, the first working cavity is communicated with the first oil return cavity, the pressure cavity is communicated with the second pressure compensation cavity, the second working cavity is communicated with the third pressure compensation cavity, when the main valve rod is in the middle position, the first working cavity is not communicated with the first oil return cavity and the first pressure compensation cavity, the pressure cavity is communicated with the second pressure compensation cavity, and the second working cavity is not communicated with the third pressure compensation cavity and the second oil return cavity. Through this preferred technical scheme, can conveniently switch the confession oil return state of first work hydraulic fluid port and second work hydraulic fluid port to can carry out pressure compensation to the hydraulic oil of exporting the work hydraulic fluid port through the compensating valve structure.

Preferably, the compensation valve structure includes a pressure compensation valve core and a pressure compensation valve cavity, the pressure compensation valve cavity includes a compensation valve oil inlet cavity and a compensation valve oil outlet cavity, the compensation valve oil inlet cavity is connected to the second pressure compensation cavity, the compensation valve oil outlet cavity is respectively connected to the first pressure compensation cavity and the third pressure compensation cavity, and the pressure compensation valve core can move in the pressure compensation valve cavity under the action of the pressure of the hydraulic oil in the compensation valve oil inlet cavity, so that the pressure difference between the hydraulic oil in the compensation valve oil inlet cavity and the compensation valve oil outlet cavity is kept at a set level. In this preferred technical scheme, the compensating valve structure can carry out pressure compensation to the hydraulic oil of supplying to first working oil mouth and second working oil mouth respectively through first pressure compensation chamber and third pressure compensation chamber.

Preferably, the holding valve structure comprises a holding valve core, a holding valve return spring and a holding valve cavity, the holding valve cavity comprises a holding valve oil inlet, a holding valve oil outlet cavity and a holding valve control cavity, the holding valve core is arranged in the holding valve cavity to block the holding valve oil inlet and the holding valve oil outlet cavity from the holding valve control cavity, the holding valve control cavity is connected with the holding pilot valve structure, and the holding valve return spring is arranged in the holding valve control cavity to enable one end of the holding valve core to press the holding valve oil inlet to form a conical seal between the holding valve oil inlet and the holding valve oil outlet cavity. Through the preferred technical scheme, the retaining valve structure can effectively separate the first working oil port and the multi-way valve when the main valve rod is positioned at the middle position under the control of the retaining pilot valve structure, prevent hydraulic oil from leaking through the multi-way valve and retain the original state of the hydraulic actuating mechanism; when the main valve rod is located at the first working position, hydraulic oil is guaranteed to be smoothly supplied to the first working oil port through the retaining valve structure; and when the main valve rod is located at the second working position, hydraulic oil of the first working oil port can flow back to the oil return port through the retaining valve structure.

Further preferably, the valve core of the holding valve is provided with a spring hole, a central hole and a damping hole, the spring hole is arranged at one end of the valve core of the holding valve, the central hole is communicated with the spring hole, the damping hole is connected with the central hole and the outer wall of the valve core of the holding valve so as to connect the oil outlet cavity of the holding valve with the control cavity of the holding valve, and the other end of the valve core of the holding valve is provided with a conical sealing surface. Through this preferred technical scheme can make the hydraulic oil that keeps in the valve oil cavity of exporting can get into through damping orifice, centre bore and spring hole and keep the valve control chamber, can prevent that the pressure of the intraoral hydraulic oil of first work oil from leading to keeping the valve case open, can also be through controlling the pressure that keeps the valve control intracavity for keep the valve case to open when first work oil port returns oil, guarantee that the hydraulic oil of first work oil port department can flow back to the oil return opening through keeping the valve structure.

Preferably, the pilot valve holding structure comprises a pilot valve holding core and a pilot valve holding cavity, the pilot valve holding cavity comprises a pilot signal oil cavity, a pilot oil inlet cavity and a pilot oil unloading cavity, the pilot signal oil cavity is connected with the second control oil port, the pilot oil inlet cavity is connected with the pilot valve holding structure, the pilot oil unloading cavity is connected with a pilot signal oil unloading port arranged on the valve body, and the pilot valve holding core is arranged in the pilot valve holding cavity and can move in the pilot valve holding cavity under the pressure control of the second control oil port so as to control the communication state between the pilot oil inlet cavity and the pilot oil unloading cavity. Through this preferred technical scheme, the hydraulic oil that comes from the second control hydraulic fluid port can promote and keep the pilot valve core in keeping pilot valve intracavity motion to can control the control end that keeps the valve structure and the pilot signal unloads the connected state of hydraulic fluid port, thereby control the action that keeps the valve structure.

Preferably, the pilot-holding valve core comprises a control sealing part, a channel part, a conical sealing part and a spring mounting part which are sequentially arranged, the pilot-holding valve core is mounted in the pilot-holding valve cavity, so that the control sealing part is positioned between the pilot signal oil cavity and the pilot oil inlet cavity to form sealing between the pilot signal oil cavity and the pilot oil inlet cavity, a pilot liquid flow channel communicated with the pilot oil inlet cavity is formed between the channel part and the pilot-holding valve cavity, the conical sealing part is positioned at the joint of the pilot oil discharge cavity and the pilot liquid flow channel, and a pilot valve spring is arranged on the spring mounting part to form thrust for pushing the pilot-holding valve core to move towards the pilot signal oil cavity. Through the preferable technical scheme, the pressure of the hydraulic oil in the pilot signal oil cavity can act on the end part of the control sealing part, the control sealing part and a pilot valve spring jointly push the pilot valve core to move in the pilot valve keeping cavity, the control conical sealing part tightly presses the pilot liquid flow channel between the pilot oil unloading cavity and the pilot oil inlet cavity to form conical sealing between the pilot oil unloading cavity and the pilot liquid flow channel, or the distance between the conical sealing part and the pilot liquid flow channel is controlled, and the size of a valve port between the pilot oil unloading cavity and the pilot liquid flow channel is controlled.

Preferably, the multi-way valve reversing link further comprises a working port overflow valve, and the working port overflow valve is arranged between the first working oil port and the oil return port and between the second working oil port and the oil return port. In this preferred technical scheme, the working port overflow valve can respectively control the pressure of the hydraulic oil of the first working oil port and the second working oil port, and when the pressure of the first working oil port and/or the second working oil port exceeds a set pressure, the working port overflow valve is opened to perform the drainage on the hydraulic oil at the first working oil port and/or the second working oil port.

Preferably, the multi-way valve reversing linkage of the present invention further comprises a check valve disposed between the compensation valve structure and the main valve structure. In this preferred technical scheme, the setting of check valve can prevent that the hydraulic oil of work hydraulic fluid port from flowing back to the compensating valve structure, reduces revealing of hydraulic oil.

Preferably, the valve body includes the main valve body, first end cover and second end cover are installed in the both sides of the main valve body, the main valve chamber runs through the main valve body sets up, just the control chamber sets up in the first end cover, the spring chamber sets up in the second end cover, first control hydraulic fluid port and second control hydraulic fluid port set up respectively on first end cover and the second end cover. Through this preferred technical scheme, can make things convenient for main valve stem's installation and maintenance.

In a second aspect, the invention provides a hydraulic system, which comprises the multi-way valve reversing link provided by the first aspect of the invention.

Through the technical scheme, the pilot valve structure is arranged in the valve body, so that the multi-way valve reversing linkage is more compact in structure, the overall size of the multi-way valve reversing linkage is reduced, the occupation of limited assembly space is reduced, and the assembly of the multi-way valve reversing linkage is facilitated. The connection oil path between the retaining pilot valve structure and the retaining valve structure and the connection oil path between the retaining pilot valve structure and other hydraulic structures in the multi-way valve are arranged in the valve body, so that the external oil path of the multi-way valve reversing connection is simplified, and the earlier-stage assembly and later-stage maintenance of the multi-way valve reversing connection are more convenient and efficient. In the preferred technical scheme of the invention, the structure for keeping the pilot valve core is simplified, and the traditional throttling groove and multi-step design on the pilot valve core are eliminated; the pilot valve core is directly arranged in the pilot valve maintaining cavity, the traditional pilot valve maintaining cavity is omitted, the production efficiency of the pilot valve maintaining structure is greatly improved, and the processing cost is saved.

The hydraulic system of the invention also has the corresponding advantages of the multi-way valve reversing connection of the invention due to the use of the multi-way valve reversing connection of the invention.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

FIG. 1 is a schematic structural diagram of a conventional multiple-way valve reversing link;

FIG. 2 is a schematic diagram of the operation of one embodiment of the multiple-way valve reversing assembly of the present invention;

FIG. 3 is a schematic structural diagram of one embodiment of a multiple-way valve reversing assembly of the present invention;

FIG. 4 is a schematic view of a holding valve spool in one embodiment of the multiple-way valve reversal assembly of the present invention;

FIG. 5 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 3;

FIG. 6 is a schematic view of a pilot-holding spool in one embodiment of the multiple-way valve reversal assembly of the present invention.

Description of the reference numerals

1. Main valve structure 11 main valve stem

12. Main valve chamber 100 control chamber

101. First oil return cavity 102 first working cavity

103. First pressure compensation chamber 104 pressure chamber

105. Second pressure compensation Chamber 106 third pressure compensation Chamber

107. Second working chamber 108 second scavenge chamber

109. Spring cavity 2 compensation valve structure

21. Pressure compensation valve core 22 pressure compensation valve cavity

221. Compensation valve oil inlet cavity 222 and compensation valve oil outlet cavity

3. Holding valve structure 31 holds valve spool

311. Spring hole 312 center hole

312. Orifice 32 hold valve return spring

301. Retention valve oil inlet 302 retention valve oil outlet cavity

303. Keep valve control chamber 4 and keep pilot valve structure

41. Keeping the pilot valve spool 411 controlling the seal

412. Passage 413 tapered seal

414. Spring mounting 42 holds the pilot valve cavity

421. Pilot signal oil cavity 422 pilot oil inlet cavity

423. Pilot valve spring of pilot oil relief cavity 43

5. Working opening overflow valve 6 one-way valve

71. First end cap 72 second end cap

8. First working oil port of working hydraulic cylinder A

B second working oil port P oil inlet

pa1 first control oil port pb1 second control oil port

T oil return port Y pilot signal oil discharge port

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are given by way of illustration and explanation only, not limitation.

In the present invention, unless otherwise stated, the directional or positional relationship indicated by the directional words such as "left" and "right" used herein is based on the directional or positional relationship shown in the drawings, and the directional or positional relationship does not represent the directional or positional relationship of the multiple-way valve train and its components in actual use.

The terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, and therefore the features defined "first", "second", "third" may explicitly or implicitly include one or more of the features described.

In the description of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "disposed," and "connected" are to be construed broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection; either directly or indirectly through intervening media, either internally or in any combination thereof. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

As shown in fig. 2 to 6, one embodiment of the multiple-way valve reversing linkage of the invention comprises a valve body and a valve structure arranged in the valve body. An oil inlet P, an oil return port T, a first working oil port A, a second working oil port B, a first control oil port pa1 and a second control oil port pb1 which are used for being connected with the outside are arranged on the valve body. Be connected with hydraulic system's hydraulic pump through oil inlet P, be connected with hydraulic system's oil return case through oil return opening T, be connected with hydraulic actuator through first working oil port A and second working oil port B, be connected with the control oil circuit of difference among hydraulic system through first control oil port pa1 and second control oil port pb1. The valve structure comprises a main valve structure 1, a compensation valve structure 2, a holding valve structure 3 and a holding pilot valve structure 4. The main valve structure 1 includes a main valve rod 11 and a main valve cavity 12, the main valve rod 11 is disposed in the main valve cavity 12, a first control oil port pa1 and a second control oil port pb1 are connected to two end portions of the main valve cavity 12 through an oil duct disposed in the valve body, hydraulic oil input through the first control oil port pa1 or the second control oil port pb1 can act on two ends of the main valve structure 1 to push the main valve rod 11 to move back and forth in the main valve cavity 12, and a communication state between the first working oil port a and the oil inlet P and the oil return port T and a communication state between the second working oil port B and the oil inlet P and the oil return port T are switched through a valve core structure disposed on the main valve rod 11, thereby controlling a working state of a hydraulic actuator connected to the first working oil port a and the second working oil port B. The compensation valve structure 2 is connected to the main valve structure 1, and is configured to perform pressure compensation on hydraulic oil output through the main valve structure 1, so as to keep a pressure difference between hydraulic oil before and after a valve opening of the main valve rod 11 constant. At this time, the flow rate of the hydraulic oil passing through the main valve structure 1 is controlled only by the valve port area of the main valve stem 11, and therefore, the movement speed of the hydraulic actuator is also controlled only by the valve port area of the main valve stem 11. Keep valve structure 3 and first working fluid port A, main valve structure 1 and keep pilot valve structure 4 to be connected, can control the case position that keeps valve structure 3 through keeping pilot valve structure 4, make when first working fluid port A and oil inlet P and oil return opening T all are not linked together, keep valve structure 3 to form the awl of inside oil duct sealed, block the oil circuit between first working fluid port A and the main valve structure 1, prevent that the hydraulic oil of first working fluid port A department from revealing to oil return opening T through the gap between main valve pole 11 and the main valve chamber 12.

In some embodiments of the multiple-way valve linkage of the present invention, as shown in fig. 3, the main valve chamber 12 includes a control chamber 100, a first oil return chamber 101, a first working chamber 102, a first pressure compensation chamber 103, a pressure chamber 104, a second pressure compensation chamber 105, a third pressure compensation chamber 106, a second working chamber 107, a second oil return chamber 108, and a spring chamber 109 arranged in series. The control cavity 100 is connected with the first control oil port pa1 through an oil passage arranged in the valve body, the first oil return cavity 101 and the second oil return cavity 108 are connected with the oil return port T through the oil passage arranged in the valve body, the first working cavity 102 is connected with the maintaining valve structure 3 through the oil passage arranged in the valve body, the first pressure compensation cavity 103, the second pressure compensation cavity 105 and the third pressure compensation cavity 106 are connected with the compensation valve structure 2 through the oil passage arranged in the valve body, the pressure cavity 104 is connected with the oil inlet P through the oil passage arranged in the valve body, the second working cavity 107 is connected with the second working oil port B through the oil passage arranged in the valve body, and the spring cavity 109 is connected with the second control oil port pb1 through the oil passage arranged in the valve body. The movement of the main valve stem 11 in the main valve chamber 12 allows the main valve stem 11 to assume a first operating position, a neutral position and a second operating position. When the main valve rod 11 is in the first operating position, the first working chamber 102 communicates with the first pressure compensation chamber 103, the pressure chamber 104 communicates with the second pressure compensation chamber 105, and the second working chamber 107 communicates with the second return chamber 108. At this time, hydraulic oil at the oil inlet P can flow into the compensation valve structure 2 through the pressure chamber 104 and the second pressure compensation chamber 105, and after pressure compensation is performed by the compensation valve structure 2, the hydraulic oil flows into the holding valve structure 3 through the first pressure compensation chamber 103 and the first working chamber 102, so as to push the holding valve structure 3 to open, and the hydraulic oil flowing out through the holding valve structure 3 supplies oil to the hydraulic actuator through the first working oil port a; meanwhile, return oil of the hydraulic actuator flows back to the oil return port T through the second working oil port B via the second working chamber 107 and the second oil return chamber 108. When the main valve rod 11 is in the second operating position, the first working chamber 102 communicates with the first oil return chamber 101, the pressure chamber 104 communicates with the second pressure compensation chamber 105, and the second working chamber 107 communicates with the third pressure compensation chamber 106. At this time, the hydraulic oil at the oil inlet P can flow into the compensation valve structure 2 through the pressure chamber 104 and the second pressure compensation chamber 105, and after pressure compensation is performed by the compensation valve structure 2, the hydraulic oil flows into the second working oil port B through the third pressure compensation chamber 106 and the second working chamber 107 to supply oil to the hydraulic actuator; meanwhile, return oil of the hydraulic actuator flows into the holding valve structure 3 through the first working oil port a, the holding valve structure 3 is opened under the control of the holding pilot valve structure 4, and hydraulic oil flows out of the holding valve structure 3 and flows back to the oil return port T through the first working cavity 102 and the first oil return cavity 101. When the main valve rod 11 is in the neutral position, the first working chamber 102 is not communicated with the first oil return chamber 101 and the first pressure compensation chamber 103, the pressure chamber 104 is communicated with the second pressure compensation chamber 105, and the second working chamber 107 is not communicated with the third pressure compensation chamber 106 and the second oil return chamber 108. At this time, the tapered seal inside the valve structure 3 is maintained to block the oil path between the first working port a and the main valve structure 1 well, so as to prevent the hydraulic oil at the first working port a from entering the first working chamber 102 and leaking to the first oil return chamber 101 through the gap between the main valve stem 11 and the main valve chamber 12.

In some embodiments of the multiple-way valve train of the present invention, as shown in fig. 3, the compensation valve structure 2 includes a pressure compensation valve spool 21 and a pressure compensation valve chamber 22. The pressure compensation valve cavity 22 is provided with a compensation valve oil inlet cavity 221 and a compensation valve oil outlet cavity 222, wherein the compensation valve oil inlet cavity 221 is connected with the second pressure compensation cavity 105, and the compensation valve oil outlet cavity 222 is respectively connected with the first pressure compensation cavity 103 and the third pressure compensation cavity 106. The pressure compensating spool 21 is installed in the compensating valve inlet chamber 22 and can move in the pressure compensating valve chamber 22 under the pressure of the hydraulic oil in the compensating valve inlet chamber 221, so as to control the flow rate between the compensating valve inlet chamber 221 and the compensating valve outlet chamber 222, and to maintain the pressure difference between the first working chamber 102 or the second working chamber 107 and the compensating valve outlet chamber 222 at a fixed level, so that the flow rate of the hydraulic oil supplied to the hydraulic actuator through the main valve structure 1 is only related to the opening degree of the valve port of the main valve structure 1. In this way, the movement speed of the hydraulic actuator is controlled only by the opening degree of the valve port of the main valve structure 1.

In some embodiments of the multiple-way valve train of the present invention, as shown in fig. 3 and 4, the holding valve structure 3 includes a holding valve spool 31, a holding valve return spring 32, and a holding valve chamber. A holding valve oil inlet 301, a holding valve oil outlet cavity 302 and a holding valve control cavity 303 are arranged in the holding valve cavity, the holding valve oil outlet cavity 302 and the holding valve control cavity 303 are respectively arranged at the positions of two ends of the holding valve cavity, and the holding valve oil inlet 301 is arranged at the end part of one end of the holding valve oil outlet cavity 302 in the holding valve cavity. The valve core 31 of the holding valve and the return spring 32 of the holding valve are arranged in the holding valve cavity, and are arranged at the opening of the holding valve cavity by using plugs to form a seal at the opening of the holding valve cavity. The holding valve control chamber 303 is located between the holding valve spool 31 and a plug at the opening of the holding valve chamber, and the holding valve control chamber 303 and the holding valve oil outlet chamber 302 are blocked by the holding valve spool 31. The retainer valve return spring 32 is installed between the retainer valve spool 31 and a plug at the opening of the retainer valve chamber, and urges the retainer valve spool 31 toward the retainer valve oil inlet 301 so that a tapered sealing surface at the end of the retainer valve spool 31 presses against the outlet edge of the retainer valve oil inlet 301 to form a tapered seal between the retainer valve oil inlet 301 and the retainer valve oil outlet chamber 302. The conical seal has better sealing performance, and can block the leakage of hydraulic oil to the oil inlet 301 of the holding valve through the oil outlet cavity 302 of the holding valve, so that the original working state of the hydraulic actuator connected to the first working oil port a is maintained when the main valve structure 1 is located at the middle position. The holding valve control cavity 303 is connected with the holding pilot valve structure 4, and the pressure of hydraulic oil in the holding valve control cavity 303 can be controlled through the holding pilot valve structure 4, so that the communication state between the holding valve oil inlet 301 and the holding valve oil outlet cavity 302 is controlled.

As a specific embodiment of the multiple-way valve switching mechanism of the present invention, as shown in fig. 3 and 4, a spring hole 311 is provided at one end of the holding valve spool 31, one end of the holding valve return spring 32 is installed in the spring hole 311, and the other end is located in the holding valve control chamber 303. A center hole 312 extending toward the other end of the holding valve body 31 is provided at the bottom end of the spring hole 311, and the center hole 312 is a blind hole not extending to the end face of the holding valve body 31. A damping hole 313 communicating with the center hole 312 is provided on the outer side surface of the portion of the holding valve spool 31 located in the holding valve oil outlet chamber 302, so that the holding valve oil outlet chamber 302 can communicate with the holding valve control chamber 303 through the damping hole 313, the center hole 312, and the spring hole 311. In this way, the hydraulic oil at the first working oil port a can enter the holding valve oil outlet cavity 302 and enter the holding valve control cavity 303 through the damping hole 313, the central hole 312 and the spring hole 311, so that pressure on the end surface of the holding valve spool 31 is formed in the holding valve control cavity 303, and the pressure on the end surface of the other end of the holding valve spool 31 formed by the hydraulic oil in the holding valve oil outlet cavity 302 is cancelled out, thereby ensuring that the holding valve spool 31 can press the holding valve oil inlet 301 tightly under the elastic force of the holding valve return spring 32. When the hydraulic oil in the holding valve control chamber 303 is unloaded under the control of the holding pilot valve structure 4, the damping hole 313 forms a hydraulic pressure difference between the holding valve oil outlet chamber 302 and the holding valve control chamber 303, the hydraulic pressure difference acts on the holding valve spool 31 to push the holding valve spool 31 to move towards one end of the holding valve control chamber 303 against the elastic force of the holding valve return spring 32, and the holding valve oil inlet 301 is communicated with the holding valve oil outlet chamber 302.

In some embodiments of the multiple-way valve directional link of the present invention, as shown in fig. 3 and 5, the pilot valve holding structure 4 includes a pilot valve holding core 41, a pilot valve holding cavity 42 and a pilot valve spring 43, the pilot valve holding core 41 and the pilot valve spring 43 are installed in the pilot valve holding cavity 42, the pilot valve holding cavity 42 is a cavity with one open end disposed in the valve body, and the opening is sealed by a plug. The pilot valve chamber 42 is provided with a pilot signal oil chamber 421, a pilot oil inlet chamber 422 and a pilot oil relief chamber 423 which are arranged at one time. The pilot signal oil cavity 421 is connected to the second control oil port pb1, the pilot oil inlet cavity 422 is connected to the holding valve structure 3, and the pilot oil discharge cavity 423 is connected to the pilot signal oil discharge port Y provided in the valve body. The holding pilot spool 41 is disposed in the holding pilot valve chamber 42, and the pilot valve spring 43 is disposed between the holding pilot spool 41 and the plug of the holding pilot valve chamber 42. The holding pilot spool 41 can move in the holding pilot valve chamber 42 under the pressure control of the second control oil port pb1 to be able to control the communication state between the pilot oil inlet chamber 422 and the pilot oil relief chamber 423, thereby controlling the pressure of the hydraulic oil in the pilot oil inlet chamber 422 connected to the holding valve structure 3.

As an embodiment of the multi-way valve switching mechanism of the present invention, as shown in fig. 5 and 6, the pilot-holding valve body 41 includes a control seal portion 411, a passage portion 412, a tapered seal portion 413, and a spring mounting portion 414, which are arranged in this order. The pilot-holding spool 41 is installed in the pilot-holding valve chamber 42 such that the control seal 411 is located between the pilot signal oil chamber 421 and the pilot oil chamber 422, isolating the pilot signal oil chamber 421 and the pilot oil chamber 422 from each other. The passage portion 412 is located between the pilot oil inlet chamber 422 and the pilot oil relief chamber 423, and a pilot fluid flow passage is formed between the passage portion 412 and the pilot retaining valve chamber 42. The conical sealing portion 413 is located in the pilot oil relief cavity 423, the pilot valve spring 43 is mounted on the spring mounting portion 414, and can push and hold the pilot valve core 41 to move towards the pilot signal oil cavity 421, so that the conical sealing portion 413 presses the pilot fluid channel to form conical sealing between the pilot oil relief cavity 423 and the pilot fluid channel. The hydraulic oil in the second control oil port pb1 can act on the end face of the control sealing portion 411 through the pilot signal oil chamber 421, and the pilot valve core 41 is pushed and kept to move towards the pilot oil relief chamber 423 direction against the elastic force of the pilot valve spring 43, so that a through-flow valve port is formed between the conical sealing portion 413 and the pilot fluid channel, and the size of the through-flow valve port between the conical sealing portion 413 and the pilot fluid channel can be controlled by controlling the pressure of the hydraulic oil in the second control oil port pb1. The structure of the pilot valve core 41 replaces the throttling groove and multi-step design in the traditional pilot valve core, the pilot valve sleeve in the traditional pilot valve structure is eliminated, the pilot valve core 41 is directly installed in the pilot valve cavity 42, and the structure of the pilot valve structure 4 is simplified.

In some embodiments of the multi-way valve reversing train of the present invention, as shown in fig. 2 and 3, the multi-way valve reversing train of the present invention further includes a working port relief valve 5. The working port overflow valve 5 can be arranged between the first working port A and the oil return port T, the working port overflow valve 5 can be specifically arranged between the oil outlet cavity 302 of the holding valve and the first oil return cavity 101, when the hydraulic oil pressure of the first working port A exceeds the set pressure, the working port overflow valve 5 is opened, the hydraulic oil of the first working port A leaks to the oil return port T through the working port overflow valve 5, and therefore the pressure of the first working port A is controlled below the set pressure. A working port overflow valve 5 may also be disposed between the second working port B and the oil return port T, and when the hydraulic oil pressure of the second working port B exceeds the set pressure, the working port overflow valve 5 is opened, and the hydraulic oil of the second working port B is discharged to the oil return port T through the working port overflow valve 5, so as to control the pressure of the second working port B below the set pressure. Therefore, the oil supply pressure of the first working oil port A and/or the second working oil port B can be limited, the hydraulic actuating mechanism is guaranteed to work under the set pressure, and the working safety of the hydraulic actuating mechanism is guaranteed.

In some embodiments of the multiple-way valve reversing assembly of the present invention, as shown in fig. 2 and 3, the multiple-way valve reversing assembly of the present invention further comprises a check valve 6. The check valve 6 is provided between the compensation valve structure 2 and the main valve structure 1, and specifically, may be provided between the compensation valve oil outlet chamber 222 and the first pressure compensation chamber 103, and between the compensation valve oil outlet chamber 222 and the third pressure compensation chamber 106, and prevents the hydraulic oil in the main valve structure 1 from flowing backward toward the compensation valve structure 2.

In some embodiments of the multiple-way valve string of the present invention, as shown in FIG. 3, the valve body includes a main valve body, a first end cap 71 and a second end cap 72. The first end cap 71 and the second end cap 72 are mounted on both sides of the main valve body, the main valve chamber 12 is disposed through the main valve body, the control chamber 100 is disposed in the first end cap 71, the spring chamber 109 is disposed in the second end cap 72, and when the first end cap 71 and the second end cap 72 are mounted on the main valve body, the control chamber 100, the main valve chamber structure in the main valve body, and the spring chamber 109 are combined into an integral main valve chamber 12. Seals are provided between the main valve body and the first and second end caps 71, 72 to ensure sealing of the main valve chamber 12 assembly. The split structure of the main valve body and the first end cover 71 and the second end cover 72 facilitates the installation of the main valve stem 11 and its accessories in the main valve cavity 12, and facilitates the maintenance of the main valve structure 1 and the oil passages in the valve body. The first and second control oil ports pa1 and pb1 are respectively provided on the first and second end caps 71 and 72, and are respectively connected to the control chamber 100 and the spring chamber 109 through internal oil passages.

The working principle of the multi-way valve reversing linkage of the invention is described below by taking the preferred embodiment as shown in the attached drawings as an example:

when no hydraulic oil control signal is input into the first control oil port pa1 and the second control oil port pb1, the main valve rod 11 is in the middle position, and oil paths among the oil inlet P, the first working oil port a, the second working oil port B and the oil return port T are cut off by the seal formed between the main valve rod 11 and the main valve cavity 12. Meanwhile, the valve core 31 of the holding valve presses the oil inlet 301 of the holding valve tightly under the action of the holding valve return spring 32 to form a conical seal between the oil inlet 301 of the holding valve and the oil outlet cavity 302 of the holding valve, and the oil is blocked from leaking from the first working oil port a through a gap between the main valve rod 11 and the main valve cavity 12, so that the working hydraulic cylinders 8 connected to the first working oil port a and the second working oil port B are kept in an original telescopic state, and the hydraulic execution mechanism is kept static at an original position.

When the first control oil port pa1 inputs a high-pressure signal, the main valve rod 11 moves left and is located at the first working position. At this time, the first working chamber 102 communicates with the first pressure compensation chamber 103, the pressure chamber 104 communicates with the second pressure compensation chamber 105, and the second working chamber 107 communicates with the second oil return chamber 108. High-pressure hydraulic oil at the oil inlet P flows into the compensation valve structure 2 through the pressure cavity 104 and the second pressure compensation cavity 105, flows into a holding valve oil inlet 301 of the holding valve structure 3 through the first pressure compensation cavity 103 and the first working cavity 102 after pressure compensation is carried out on the compensation valve structure 2, pushes the holding valve spool 31 to move towards the direction of the holding valve return spring 32, and enables the holding valve oil inlet 301 to be communicated with the holding valve oil outlet cavity 302. The holding valve oil inlet 301 is communicated with an oil inlet P, the holding valve control cavity 303 is communicated with the first working oil port A through a damping hole 313, the pressure of the oil inlet P is higher than that of the first working oil port A, the holding valve core 31 is pushed to enable the holding valve oil inlet 301 to be communicated with the holding valve oil outlet cavity 302, and high-pressure hydraulic oil enters the rodless cavity of the working hydraulic cylinder 8 through the first working oil port A; the hydraulic oil in the rod cavity of the working hydraulic cylinder 8 flows back to the oil return port T through the second working oil port B, the second working cavity 107 and the second oil return cavity 108, and the working hydraulic cylinder 8 extends out to push the hydraulic actuating mechanism to work.

When the second control oil port pb1 inputs a high-pressure signal, the main valve stem 11 moves to the right and is located at a second working position. At this time, the first working chamber 102 communicates with the first oil return chamber 101, the pressure chamber 104 communicates with the second pressure compensation chamber 105, and the second working chamber 107 communicates with the third pressure compensation chamber 106. The high-pressure hydraulic oil at the oil inlet P flows into the compensation valve structure 2 through the pressure cavity 104 and the second pressure compensation cavity 105, and flows into the rod cavity of the working hydraulic cylinder 8 through the third pressure compensation cavity 106, the second working cavity 107 and the second working oil port B after being subjected to pressure compensation by the compensation valve structure 2; meanwhile, the second control oil port pb1 enters the pilot signal oil chamber 421 through an oil passage inside the valve body, and pushes the pilot valve core 41 to be kept open, so that the pilot oil inlet chamber 422 is communicated with the pilot oil unloading chamber 423, and the valve control chamber 303 is kept unloaded. Meanwhile, the high-pressure hydraulic oil at the first working oil port a acts on the tapered sealing end of the holding valve spool 31 to push the holding valve spool 31 to open. Hydraulic oil in a rodless cavity of the working hydraulic cylinder 8 flows back to the oil return port T through the first working oil port a, the holding valve oil outlet cavity 302, the holding valve oil inlet 301, the first working cavity 102 and the first oil return cavity 101, and the working hydraulic cylinder 8 retracts to push the hydraulic actuating mechanism to return.

The hydraulic system provided by the invention also has the advantages of the multi-way valve reversing linkage response embodiment due to the use of the multi-way valve reversing linkage provided by any embodiment of the invention.

In the description of the present invention, reference to the description of the terms "one embodiment," "some embodiments," "a specific embodiment," etc., means 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 present invention. In the present disclosure, the schematic representations of the terms used above do not necessarily 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.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, numerous simple variants are possible, comprising the combination of the individual specific technical features in any suitable manner. The invention is not described in detail in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.

Claims

1. The multi-way valve reversing connector comprises a valve body and a valve structure arranged in the valve body, and is characterized in that the valve body is provided with an oil inlet (P), an oil return port (T), a first working oil port (A), a second working oil port (B), a first control oil port (pa 1) and a second control oil port (pb 1) which are connected with each other, the valve structure comprises a main valve structure (1), a compensation valve structure (2), a retaining valve structure (3) and a retaining pilot valve structure (4), the main valve structure (1) comprises a main valve rod (11) and a main valve cavity (12), the main valve rod (11) is arranged in the main valve cavity (12), and can be controlled by hydraulic oil of the first control oil port (pa 1) and the second control oil port (pb 1) to move in the main valve cavity (12) so as to switch the communication state between the first working oil port (a) and the second working oil port (B) and the oil inlet (P) and the oil return port (T), the compensation valve structure (2) is connected with the main valve structure (1) so as to perform pressure compensation on the hydraulic oil output through the main valve structure (1), the holding valve structure (3) is connected with the first working oil port (a), the main valve structure (1) and the holding pilot valve structure (4) so as to block the first working oil port (a) and the main valve structure (4) under the control of the holding pilot valve structure (4) Oil passages among the structures (1);

the main valve cavity (12) comprises a control cavity (100), a first oil return cavity (101), a first working cavity (102), a first pressure compensation cavity (103), a pressure cavity (104), a second pressure compensation cavity (105), a third pressure compensation cavity (106), a second working cavity (107), a second oil return cavity (108) and a spring cavity (109), the control cavity (100) is connected with the first control oil port (pa 1), the first oil return cavity (101) and the second oil return cavity (108) are both connected with the oil return port (T), the first working cavity (102) is connected with the holding valve structure (3), the first pressure compensation cavity (103), the second pressure compensation cavity (105) and the third pressure compensation cavity (106) are all connected with the compensation valve structure (2), the main valve (104) is connected with the oil inlet (P), the second working cavity (107) is connected with the second working oil port (B), the spring cavity (109) is connected with the second control oil port (1), the main valve cavity (104) is connected with the first working cavity (11) and the second working cavity (11) is positioned in the first working cavity (11), and the first working cavity (11) and the second working cavity (11) can be positioned in the first position when the first working cavity (11) and the first pressure compensation cavity (11) are connected with the second working cavity (11), the pressure chamber (104) is communicated with the second pressure compensation chamber (105), the second working chamber (107) is communicated with the second oil return chamber (108), when the main valve rod (11) is located at a second working position, the first working chamber (102) is communicated with the first oil return chamber (101), the pressure chamber (104) is communicated with the second pressure compensation chamber (105), the second working chamber (107) is communicated with the third pressure compensation chamber (106), when the main valve rod (11) is located at a middle position, the first working chamber (102) is not communicated with the first oil return chamber (101) and the first pressure compensation chamber (103), the pressure chamber (104) is communicated with the second pressure compensation chamber (105), and the second working chamber (107) is not communicated with the third pressure compensation chamber (106) and the second oil return chamber (108).

2. The multi-way valve linkage according to claim 1, wherein the compensation valve structure (2) comprises a pressure compensation valve core (21) and a pressure compensation valve cavity (22), the pressure compensation valve cavity (22) comprises a compensation valve oil inlet cavity (221) and a compensation valve oil outlet cavity (222), the compensation valve oil inlet cavity (221) is connected with the second pressure compensation cavity (105), the compensation valve oil outlet cavity (222) is respectively connected with the first pressure compensation cavity (103) and the third pressure compensation cavity (106), and the pressure compensation valve core (21) can move in the pressure compensation valve cavity (22) under the pressure of hydraulic oil in the compensation valve oil inlet cavity (221), so that the pressure difference between the hydraulic oil in the compensation valve oil inlet cavity (221) and the compensation valve oil outlet cavity (222) is kept at a set level.

3. The multiple-way valve reversing linkage according to claim 1, characterized in that the holding valve structure (3) comprises a holding valve spool (31), a holding valve return spring (32), and a holding valve cavity comprising a holding valve oil inlet (301), a holding valve oil outlet cavity (302), and a holding valve control cavity (303), the holding valve spool (31) is disposed in the holding valve cavity to block the holding valve oil inlet (301) and the holding valve oil outlet cavity (302) from the holding valve control cavity (303), the holding valve control cavity (303) is connected with the holding pilot valve structure (4), and the holding valve return spring (32) is disposed in the holding valve control cavity (303) to enable one end of the holding valve spool (31) to press against the holding valve oil inlet (301) to form a cone seal between the holding valve oil inlet (301) and the holding valve oil outlet cavity (302).

4. The multi-way valve reversing linkage according to claim 3, characterized in that a spring hole (311), a central hole (312) and a damping hole (313) are arranged on the retaining valve core (31), the spring hole (311) is arranged at one end of the retaining valve core (31), the central hole (312) is communicated with the spring hole (311), the damping hole (313) is connected with the central hole (312) and the outer wall of the retaining valve core (31) to connect the retaining valve oil outlet cavity (302) and the retaining valve control cavity (303), and a conical sealing surface is arranged at the other end of the retaining valve core (31).

5. The multi-way valve reversing linkage according to claim 1, characterized in that the pilot retaining valve structure (4) comprises a pilot retaining valve spool (41) and a pilot retaining valve cavity (42), the pilot retaining valve cavity (42) comprises a pilot signal oil cavity (421), a pilot oil inlet cavity (422) and a pilot oil discharge cavity (423), the pilot signal oil cavity (421) is connected with the second control oil port (pb 1), the pilot oil inlet cavity (422) is connected with the pilot retaining valve structure (3), the pilot oil discharge cavity (423) is connected with a pilot signal oil discharge port (Y) arranged on the valve body, and the pilot retaining valve spool (41) is arranged in the pilot retaining valve cavity (42) and can move in the pilot retaining valve cavity (42) under the pressure control of the second control oil port (pb 1) to control the communication state between the pilot oil inlet cavity (422) and the pilot oil discharge cavity (423).

6. The multiple-way valve reversing linkage according to claim 5, characterized in that the pilot-maintaining valve core (41) comprises a control sealing part (411), a channel part (412), a conical sealing part (413) and a spring mounting part (414) which are arranged in sequence, the pilot-maintaining valve core (41) is mounted in the pilot-maintaining valve cavity (42) so that the control sealing part (411) is positioned between the pilot signal oil cavity (421) and the pilot oil inlet cavity (422) to form a seal between the pilot signal oil cavity (421) and the pilot oil inlet cavity (422), a pilot liquid flow channel communicated with the pilot oil inlet cavity (422) is formed between the channel part (412) and the pilot-maintaining valve cavity (42), the conical sealing part (413) is positioned at the connection part of the pilot oil cavity (423) and the pilot liquid flow channel, and a pilot valve spring (43) is arranged on the spring mounting part (414) to form a thrust force for pushing the pilot-maintaining valve core (41) to move towards the pilot signal oil cavity (421).

7. The multi-way valve linkage according to any one of claims 1 to 6, further comprising a working port overflow valve (5), wherein the working port overflow valve (5) is disposed between the first working port (A) and the oil return port (T), and between the second working port (B) and the oil return port (T).

8. Multiple-way valve linkage according to any one of claims 1 to 6, characterized by further comprising a one-way valve (6), the one-way valve (6) being arranged between the compensation valve arrangement (2) and the main valve arrangement (1).

9. The multiple-way valve linkage according to any one of claims 1 to 6, wherein the valve body comprises a main valve body, a first end cover (71) and a second end cover (72), the first end cover (71) and the second end cover (72) are mounted on two sides of the main valve body, the main valve cavity (12) is arranged through the main valve body, the control cavity (100) is arranged in the first end cover (71), the spring cavity (109) is arranged in the second end cover (72), and the first control oil port (pa 1) and the second control oil port (pb 1) are respectively arranged on the first end cover (71) and the second end cover (72).

10. A hydraulic system comprising a multiple-way valve reversing coupling according to any one of claims 1-9.