CN212643209U - Hydraulic control reversing valve for controlling internal oil supply - Google Patents

Abstract

The utility model discloses a liquid accuse switching-over valve that supplies in control oil, including the valve body, the valve body is provided with oil inlet and a plurality of pneumatic cylinder interface, and every pneumatic cylinder interface all communicates an oil return opening, communicates mutually between a plurality of oil return openings, and slidable mounting has the case that is used for controlling break-make between oil inlet and the pneumatic cylinder interface in the valve body, and slidable mounting has the valve shaft in the case, and valve shaft and oil inlet and oil return opening intercommunication, the valve shaft also communicates with the case mounting hole in the valve body. The trend of the control oil path is changed through the position of the valve shaft, so that the position of the valve core is changed. The control oil is taken from the main oil way and supplied internally, the structure is simple, and the main oil way is higher than the external oil supply way in oil pressure, the reversing speed is high, and the position is accurate.

Description

Hydraulic control reversing valve for controlling internal oil supply

Technical Field

The utility model relates to a hydraulic pressure field especially relates to a liquid accuse switching-over valve of confession in control oil.

Background

The reversing valve is a directional control valve with more than two flow forms and more than two oil ports. The valve realizes communication, cutting off and reversing of a hydraulic oil way, pressure unloading and sequential action control. The valve core is divided into two positions, three positions and the like according to the number of the working positions of the valve core staying in the valve body; the oil way connected with the valve body is divided into a two-way, a three-way, a four-way, a six-way and the like; the motion modes of the valve core are divided into manual, motor, electric, hydraulic, electrohydraulic and other modes.

The existing hydraulic control reversing valve controls oil supply, and a control push rod is of a piston type. The reversing valve adopts control oil supply, so that the reversing valve and accessories thereof are more, the structure is numerous and complicated, the volume is larger, and the piston type push rod is adopted, so that easily damaged sealing parts such as rubber rings are needed, the end cover structure is complicated, the oil quantity required to be controlled is more, and the reversing speed is slow.

The existing electromagnetic directional valve needs to be electrified when in use and has short service life.

The manual control reversing valve on the market has the problem that the opening handle cannot be accurately controlled and is easy to damage. In the hydraulic mechanism, hydraulic oil cylinders are adopted in a plurality of places, and when two cylinders or a plurality of cylinders are required to act in sequence in the same device, the system control requirements can be realized through hydraulic elements such as a mechanical device, a logic circuit, a hydraulic loop control hydraulic cylinder, an electromagnetic directional valve and the like. These methods all make the system more complex, reduce reliability and increase cost.

Disclosure of Invention

To these problems, the utility model discloses a liquid accuse switching-over valve of confession in control oil changes the control oil circuit trend through the valve shaft position for case position changes. The control oil is taken from the main oil way and supplied internally, the structure is simple, and the main oil way is higher than the external oil supply way in oil pressure, the reversing speed is high, and the position is accurate.

The utility model provides a hydraulically controlled switching-over valve that confession in control oil, includes the valve body, the valve body is provided with oil inlet and a plurality of pneumatic cylinder interface, and every pneumatic cylinder interface all communicates an oil return opening, communicates each other between a plurality of oil return openings, slidable mounting has the case that is used for controlling break-make between oil inlet and the pneumatic cylinder interface in the valve body, slidable mounting has the valve shaft in the case, valve shaft and oil inlet intercommunication, the valve shaft also communicates with the oil return opening, the valve shaft also communicates with the case mounting hole in the valve body.

Preferably, both ends of the valve shaft penetrate through and protrude out of the valve core.

Preferably, the protruding parts at the two ends of the valve shaft are coaxially provided with oil through blind holes, the oil through blind holes are communicated with oil guide holes, and the oil guide holes are communicated with the valve body.

Preferably, a spring chamber and a pressure chamber which are communicated with the oil guide hole are arranged in the valve body, the spring chamber is communicated with the oil return hole, and the pressure chamber is communicated with the oil inlet.

Preferably, a pressure spring is installed in the spring chamber, and a limit ball is arranged between the pressure spring and the valve shaft.

Preferably, the valve shaft, the valve core and the valve body are coaxially arranged.

Preferably, the valve body is formed by combining three parts, namely an end cover A, a main valve body and an end cover B from top to bottom in sequence.

The utility model has the advantages that:

the utility model discloses a valve shaft position changes the intercommunication state of passageway and valve shaft in the valve body, forms different control oil circuit for case both ends atress direction changes, and the case action makes the inside action chamber of valve body take place corresponding change, realizes the switching-over of hydro-cylinder action. The control oil is taken from the main oil way, the reversing valve has compact structure and accurate action, and the main oil way has higher oil pressure, higher reversing speed and accurate position compared with an external oil supply way.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a structural diagram of the valve core before reversing the valve shaft of the present invention;

FIG. 2 is a schematic view of the valve core and valve shaft of the present invention after being reversed;

in the figure, 1, a valve shaft, 2, an end cover A, 3, a main valve body, 4, an end cover B, 5, an oil return channel A, 6, a valve core, 7, a hydraulic cylinder interface A, 8, a hydraulic cylinder interface B, 9, an oil return opening A, 10, an oil return opening B, 11, a spring chamber A, 12, a spring chamber B, 13, a pressure chamber B, 14, a pressure chamber A, 15, an oil inlet, 16, an oil inlet channel A, 17, an oil inlet channel B, 18 and an oil return channel B.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present invention, it should be understood that the terms "inside", "outside", "left" and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

The utility model discloses a liquid accuse switching-over valve of confession in control oil as shown in fig. 1-2, for processing convenience and realize the intercommunication between the inside hole, set up the valve body into the triplex combination formula, the intermediate portion is the main valve body 3 promptly, end cover A2 is connected to the upper end, end cover B4 is connected to the lower extreme, and both ends cover passes through bolt and nut with the main valve body and is connected as a whole. A valve core 6 and a valve shaft 1 are coaxially arranged in the valve body in sequence, and two ends of the valve shaft penetrate through and protrude out of the outer side of the valve core. The both ends bulge of valve shaft all is coaxial to be provided with logical oily blind hole, and inwards in proper order transversely process from the tip on the valve shaft have with lead to the first oil guide hole and the second oil guide hole of oily blind hole intercommunication. A pressure cavity and a spring chamber are transversely processed on the end cover, an oil return channel and an oil inlet channel are longitudinally processed on the valve body, and an oil inlet 15, an oil return port A9, an oil return port B10, a hydraulic cylinder interface A7 and a hydraulic cylinder interface B8 are transversely processed on the valve body. The oil inlet 15 is communicated with the pressure chamber A14 through an oil inlet channel 16 at the end A, communicated with the oil through a blind oil through hole of the first oil guide hole, and further enters a space between the valve core 6 and the valve body through a second oil guide hole. The oil through blind hole at the end B is communicated with a spring chamber B12 through a first oil guide hole, a return oil passage B18 is communicated with an oil return port B10, and the oil return port A9 and the oil return port B10 are communicated through an internal passage of the valve body. The A oil return port 9 is communicated with a hydraulic cylinder port A7 through an internal channel of the valve body, and the B oil return port 10 is communicated with a hydraulic cylinder port B8 through an internal channel.

And a pressure spring is arranged in the spring chamber, and a limiting ball is arranged between the pressure spring and the valve shaft and used for judging whether the valve shaft moves in place.

The working process of the structure is as follows:

when the valve shaft 1 is located at the limit ball of the B spring chamber 12: the state of the reversing valve is shown in figure 1, a spring chamber B12 is communicated with an oil through blind hole in a valve shaft, a spring chamber A11 is closed, meanwhile, a pressure chamber A14 is communicated with the oil through blind hole of the valve shaft through a first oil guide hole, the through blind hole is communicated with an inner cavity of a valve body through a second oil guide hole, the pressure chamber B is closed, hydraulic oil flows through the pressure chamber A14 from an oil inlet P15 to act on the upper end face of a valve core 6, at the lower end of the valve core, the oil in the valve body cavity flows into the oil through blind hole from the second oil guide hole, flows into the spring chamber B12 through the first oil guide hole, flows through an oil return passage B10 and an oil return opening A. The valve core is acted by the acting force from the end cover A2 to the end cover B4 and moves downwards, and the lower end of the valve core is attached to the inner surface of the end cover B. The valve shaft also moves downward under the power of hydraulic oil.

The direction of the oil path of the reversing valve is as follows: the hydraulic oil flows through the hydraulic cylinder interface B8 from the oil inlet 17, flows into the reverse oil inlet pipe of the bidirectional oil cylinder, flows through the hydraulic cylinder interface A7 from the reverse oil return pipe, flows back to the hydraulic station from the oil return port A9 and the oil return port B10. At the moment, the bidirectional oil cylinder reversely acts.

When the valve shaft moves to the limiting ball of the A spring chamber 11: the diverter valve state is shown in figure 2. At this time, the position of the valve shaft is changed, the A spring chamber 11 is communicated with the valve shaft, the B spring chamber 12 is closed, the B pressure chamber 13 is communicated with the valve shaft, and the A pressure chamber 14 is closed. Hydraulic oil flows from the oil inlet 15 through the B pressure cavity 13 from the B end oil inlet channel 16, flows into the oil through blind hole in the valve shaft through the first oil guide hole, flows out from the second oil guide hole and acts on the lower end face of the valve core 6, and oil in the cavity at the upper end of the valve core flows from the A pressure cavity 11 through the A oil outlet channel, the oil return port A9 and the oil return port B10 and flows back to the hydraulic station. The valve core moves upwards under the action of the force directed to the end cover A from the end cover B, and the upper surface of the valve core is attached to the inner surface of the end cover A.

When the upper end of the valve core is attached to the surface of the end cover A, the switching action is completed, the reversing valve is in a working state 2, and the oil path of the reversing valve at the moment moves: hydraulic oil flows through a hydraulic cylinder connector A7 from an oil inlet 15, flows into a positive oil inlet pipe of the bidirectional oil cylinder, flows through a hydraulic cylinder connector B8 from a positive oil return pipe, and flows back to the hydraulic station from an oil return port B10 and an oil return port A9. At the moment, the oil supply direction of the bidirectional oil cylinder changes the positive direction action, and the reversing control of the action of the oil cylinder is realized.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (7)

1. The hydraulic control reversing valve is characterized by comprising a valve body, wherein the valve body is provided with an oil inlet and a plurality of hydraulic cylinder interfaces, each hydraulic cylinder interface is communicated with an oil return port, the plurality of oil return ports are communicated with each other, a valve core used for controlling the on-off between the oil inlet and the hydraulic cylinder interfaces is arranged in the valve body in a sliding mode, a valve shaft is arranged in the valve core in the sliding mode, the valve shaft is communicated with the oil inlet and also communicated with the oil return ports, and the valve shaft is also communicated with a valve core mounting hole in the valve body.

2. A pilot-operated directional control valve for internal supply of oil according to claim 1, wherein both ends of the valve shaft penetrate and protrude outside the valve body.

3. A pilot-controlled directional control valve for controlling internal supply of oil according to claim 1, wherein the projections at both ends of the valve shaft are coaxially provided with blind oil through holes, the blind oil through holes are communicated with oil guide holes, and the oil guide holes are communicated with the valve body.

4. A pilot-operated directional control valve for internal supply of oil according to claim 3, wherein a spring chamber and a pressure chamber are provided in said valve body in communication with said oil guide hole, said spring chamber being in communication with the oil return port, said pressure chamber being in communication with the oil inlet port.

5. A pilot-operated directional control valve for internal supply of oil according to claim 4, wherein a pressure spring is installed in the spring chamber, and a limit ball is provided between the pressure spring and the valve shaft.

6. A pilot-operated directional control valve for internal supply of oil according to claim 1, wherein the valve shaft, the spool, and the valve body are coaxially disposed.

7. A pilot-operated directional control valve for internal supply of oil according to claim 1, wherein the valve body is formed by combining three parts, namely an a end cover, a main valve body and a B end cover from top to bottom.

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