CN220869768U

CN220869768U - Flow control valve

Info

Publication number: CN220869768U
Application number: CN202322834115.8U
Authority: CN
Inventors: 姜伟; 史浙安; 郑志雨; 张善同; 肖斌
Original assignee: Shanghai Shengbang Hydraulic Co ltd; Xuzhou Shengbang Machinery Co Ltd; Zhejiang Sunbun Technology Co Ltd; Sunbun Group Co Ltd
Current assignee: Shanghai Shengbang Hydraulic Co ltd; Xuzhou Shengbang Machinery Co Ltd; Zhejiang Sunbun Technology Co Ltd; Sunbun Group Co Ltd
Priority date: 2023-10-23
Filing date: 2023-10-23
Publication date: 2024-04-30
Anticipated expiration: 2033-10-23

Abstract

A flow control valve. The problem of current loader arm hydro-cylinder float decline speed is faster, and the product rocks greatly is solved. The valve body on be equipped with guide's hydraulic fluid port, first interface, second interface and first oil return port, the valve body in be equipped with the mounting hole, the mounting hole in be equipped with the case and form spring chamber and control chamber, the case have the first position when installing and make first interface, the second position that first oil return port is linked together, spring chamber and control chamber locate the both sides of case, guide's hydraulic fluid of guide's hydraulic fluid port lets in the control intracavity and mutually support the position of control case with the elastic force in spring chamber. According to the utility model, the first interface and the second interface which are connected with the oil cylinder are connected or disconnected through the position change of the valve core, so that floating is realized when the oil cylinder scrapes the ground, the descending speed of the oil cylinder is controllable, the floating descending time is controlled, and the whole vehicle is kept stable in the floating descending process.

Description

Flow control valve

Technical Field

The utility model relates to a large-tonnage loader engineering vehicle, in particular to a flow control valve.

Background

The loader is widely applied to complex working conditions such as coal mines, sandy soil and the like as important engineering equipment, and the stability of the whole loader is an important investigation index and even affects the safety problem. The existing loader basically has a floating function, when the floating function of the loader is the floating function, the rodless cavity and the rod cavity of the movable arm oil cylinder are simultaneously communicated with the hydraulic oil tank, and the movable arm oil cylinder is in a free floating state along with the ground and the dead weight, so that the ground scraping operation is realized. The current common practice in foreign countries is to adopt a cartridge valve combination mode, and the flow is relatively small due to the limitation of the cartridge. For some loaders with lengthened arms, because the gravity center of the bucket moves forward, the floating descending speed is relatively high, the whole loader is greatly swayed, and uncomfortable feeling is brought to a driver.

Disclosure of utility model

The utility model provides a flow control valve, which aims to solve the problems of high floating descending speed and large product shaking of a movable arm oil cylinder of an existing loader in the background art.

The technical scheme of the utility model is as follows: the utility model provides a flow control valve, includes the valve body, the valve body on be equipped with the guide hydraulic fluid port, be used for the first interface that is linked together with hydro-cylinder rodless chamber, be used for the hydro-cylinder to have the second interface that the pole chamber is connected and be used for the first oil return port of return oil, the valve body in be equipped with the mounting hole, the mounting hole in be equipped with the case and form spring chamber and control chamber, the case have the first position when installing and make the second position that first interface, first oil return port are linked together, spring chamber and control chamber locate the both sides of case, the guide oil of guide hydraulic fluid port lets in the control intracavity and controls the position of case with the elastic force cooperation in spring chamber.

As a further improvement of the utility model, the valve core is provided with a sealing part, the sealing part is matched with the inner wall of the mounting hole, the mounting hole is divided into a first cavity and a second cavity by the sealing part when the valve core is positioned at the first position, the first cavity is connected with the first interface, and the second cavity is connected with the second interface.

As a further improvement of the utility model, the sealing part is arranged in a conical surface.

As a further improvement of the utility model, the second cavity is connected with the first oil return port through a one-way valve, and the one-way valve supplements oil from the position of the second oil return port and conveys the oil to the second interface.

As a further development of the utility model, the valve element is milled with a throttle opening at the second chamber.

As a further improvement of the utility model, a first guide part is arranged at the position of the valve core, which is close to the control cavity, and the first guide part is jointed with the inner wall of the mounting hole and is in sliding fit with the valve body.

As a further improvement of the utility model, a valve sleeve is arranged in the mounting hole, the valve core comprises a second guide part, and the second guide part is arranged close to the spring cavity and is in sliding fit with the valve sleeve.

As a further improvement of the utility model, the outer side of the end part of the valve core is provided with an end cover, and the end cover is propped against the valve sleeve through a retaining sleeve and is used for limiting the valve sleeve.

As a further improvement of the utility model, a nut is arranged on the outer side of the end part of the valve core, the nut is in threaded connection with the valve body, and the nut, the valve core and the valve body are mutually matched to form the control cavity.

As a further improvement of the utility model, a second oil return port is arranged on the valve body, the spring cavity is connected with the second oil return port, and the spring cavity and the control cavity are arranged at two sides of the valve core.

The utility model has the beneficial effects that the valve core is arranged, the first interface and the second interface which are connected with the oil cylinder are connected or disconnected through the position change of the valve core, so that floating is realized when the oil cylinder scrapes the ground, the descending speed of the oil cylinder is controlled through the pilot oil, the floating descending time is controlled, the whole vehicle is kept stable in the floating descending process, and the problem of shaking of the whole vehicle caused by impact generated by the too fast descending speed is avoided.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present utility model.

Fig. 2 is a schematic cross-sectional view of an embodiment of the present utility model.

Fig. 3 is a schematic diagram of the hydraulic principle of an embodiment of the present utility model.

In the figure, 1, a valve body; 11. a pilot oil port; 12. a first interface; 13. a second interface; 14. a first oil return port; 15. a second oil return port; 2. a mounting hole; 21. a spring cavity; 22. a control chamber; 23. a first chamber; 24. a second chamber; 3. a valve core; 31. a sealing part; 32. a choke; 33. a first guide part; 34. a second guide part; 4. a one-way valve; 5. a valve sleeve; 6. an end cap; 7. a blocking sleeve; 8. and (5) a screw cap.

Detailed Description

Embodiments of the utility model are further described below with reference to the accompanying drawings:

The flow control valve is shown by combining fig. 1 with fig. 2-3, and comprises a valve body 1, wherein a pilot oil port 11, a first interface 12 used for being communicated with a rodless cavity of an oil cylinder, a second interface 13 used for being connected with a rod cavity of the oil cylinder and a first oil return port 14 used for oil return are arranged on the valve body 1, a mounting hole 2 is formed in the valve body 1, a valve core 3 is arranged in the mounting hole 2, a spring cavity 21 and a control cavity 22 are formed, the valve core 3 is provided with a first position during mounting and a second position enabling the first interface 12 and the first oil return port 14 to be communicated, the spring cavity 21 and the control cavity 22 are arranged on two sides of the valve core 3, and pilot oil of the pilot oil port 11 is introduced into the control cavity 22 and is mutually matched with elastic force of the spring cavity 21 to control the position of the valve core 3. The utility model has the beneficial effects that the valve core is arranged, the first interface and the second interface which are connected with the oil cylinder are connected or disconnected through the position change of the valve core, so that floating is realized when the oil cylinder scrapes the ground, the descending speed of the oil cylinder is controlled through the pilot oil, the floating descending time is controlled, the whole vehicle is kept stable in the floating descending process, and the problem of shaking of the whole vehicle caused by impact generated by the too fast descending speed is avoided. Further description will be made in connection with the principle of hydraulics: the large cavity of the movable arm oil cylinder is connected with a C+ port (a first interface), the small cavity is connected with a C-port (a second interface), a T port (a first oil return port) is connected with an oil return tank, an X port (a pilot oil port) is connected with pilot pressure, a D port (a second oil return port) is connected with oil return, when the movable arm oil cylinder reaches a floating position, the pilot pressure is higher, the movable arm oil cylinder rapidly descends, at the moment, the small cavity supplements oil, under the action of the self weight of a bucket, the large cavity pressure difference of the movable arm oil cylinder is controlled by controlling the opening of a valve core through pilot pressure regulation, so that the oil return flow of the movable arm large cavity is controlled, the floating descending time is controlled, the whole vehicle is kept stable in the floating descending process, and the problem of shaking of the whole vehicle caused by the impact generated due to the too fast descending speed is avoided.

The valve core 3 is provided with a sealing part 31, the sealing part 31 is matched with the inner wall of the mounting hole 2, the mounting hole 2 is divided into a first cavity 23 and a second cavity 24 by the sealing part 31 when the valve core 3 is positioned at a first position, the first cavity 23 is connected with the first interface 12, and the second cavity 24 is connected with the second interface 13. Specifically, the sealing portion 31 is provided in a tapered surface. The sealing part adopts a cone valve sealing design, so that the leakage is extremely low, and the movable arm oil cylinder is ensured not to drop due to internal leakage.

The second cavity 24 is connected with the first oil return port 14 through the one-way valve 4, and the one-way valve 4 supplements oil from the position of the first oil return port 14 and conveys the oil to the second interface 13. The first oil return port can supplement oil through the one-way valve to push the oil cylinder cavity of the oil cylinder to quickly descend.

The valve core 3 is milled with a throttle 32 at the second chamber 24. The arrangement of the throttle opening enables the product to act more stably.

The valve core 3 is provided with a first guide part 33 near the control cavity 22, and the first guide part 33 is jointed with the inner wall of the mounting hole 2 and is in sliding fit with the valve body 1. Specifically, the valve sleeve 5 is disposed in the mounting hole 2, the valve core 3 includes a second guiding portion 34, and the second guiding portion 34 is disposed near the spring cavity 21 and slidingly engages with the valve sleeve 5. The guide parts are arranged, and the two sides of the valve core are arranged by the guide parts, so that the valve core is guided when acting, and the action reliability is high.

An end cover 6 is arranged on the outer side of the end part of the valve core 3, and the end cover 6 is propped against the valve sleeve 5 through a retaining sleeve 7 and used for limiting the valve sleeve 5. Specifically, a nut 8 is arranged at the outer side of the end part of the valve core 3, the nut 8 is in threaded connection with the valve body 1, and the nut 8, the valve core 3 and the valve body 1 are mutually matched to form the control cavity 22. The structure is convenient for the disassembly and the connection of the valve core, has simple structure, convenient installation, reliable fixation and convenient maintenance and replacement.

The valve body 1 is provided with a second oil return port 15, the spring cavity 21 is connected with the second oil return port 15, and the spring cavity 21 and the control cavity 22 are arranged on two sides of the valve core 3. The spring cavity and the control cavity (pilot oil port) are independently controlled, the back pressure can not influence the flow, and the control is more accurate.

In the description of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art. Furthermore, in the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

The skilled person will know: while the utility model has been described in terms of the foregoing embodiments, the inventive concepts are not limited to the utility model, and any modifications that use the inventive concepts are intended to be within the scope of the appended claims.

Claims

1. A flow control valve comprises a valve body (1) and is characterized in that a pilot oil port (11), a first interface (12) used for being communicated with a rodless cavity of an oil cylinder, a second interface (13) used for being connected with a rod cavity of the oil cylinder and a first oil return port (14) used for returning oil are arranged on the valve body (1), a mounting hole (2) is formed in the valve body (1), a valve core (3) is arranged in the mounting hole (2) and forms a spring cavity (21) and a control cavity (22), the valve core (3) is provided with a first position during mounting and a second position enabling the first interface (12) and the first oil return port (14) to be communicated, the spring cavity (21) and the control cavity (22) are arranged on two sides of the valve core (3), and pilot oil of the pilot oil port (11) is led into the control cavity (22) and is matched with elastic force of the spring cavity (21) to control the position of the valve core (3).

2. A flow control valve according to claim 1, characterized in that the valve core (3) is provided with a sealing part (31), the sealing part (31) is matched with the inner wall of the mounting hole (2), and when the valve core (3) is in the first position, the mounting hole (2) is separated into a first cavity (23) and a second cavity (24) by the sealing part (31), the first cavity (23) is connected with the first interface (12), and the second cavity (24) is connected with the second interface (13).

3. A flow control valve according to claim 2, characterized in that the sealing portion (31) is conically arranged.

4. A flow control valve according to claim 2, characterized in that the second chamber (24) is connected to the first return port (14) via a non-return valve (4), said non-return valve (4) being supplied with oil from the first return port (14) and being fed to the second connection port (13).

5. A flow control valve according to claim 2, characterized in that the valve element (3) is milled with a restriction (32) at the second chamber (24).

6. A flow control valve according to claim 1, characterized in that the valve core (3) is provided with a first guiding part (33) near the control cavity (22), and the first guiding part (33) is jointed with the inner wall of the mounting hole (2) and is in sliding fit with the valve body (1).

7. A flow control valve according to claim 1, characterized in that a valve sleeve (5) is provided in the mounting hole (2), the valve element (3) comprises a second guiding part (34), and the second guiding part (34) is arranged close to the spring cavity (21) and is in sliding fit with the valve sleeve (5).

8. The flow control valve according to claim 7, characterized in that an end cover (6) is arranged on the outer side of the end part of the valve core (3), and the end cover (6) is propped against the valve sleeve (5) through a retaining sleeve (7) and is used for limiting the valve sleeve (5).

9. The flow control valve according to claim 1, characterized in that a nut (8) is arranged on the outer side of the end part of the valve core (3), the nut (8) is in threaded connection with the valve body (1), and the nut (8), the valve core (3) and the valve body (1) are mutually matched to form the control cavity (22).

10. A flow control valve according to claim 1, characterized in that the valve body (1) is provided with a second oil return port (15), the spring chamber (21) is connected with the second oil return port (15), and the spring chamber (21) and the control chamber (22) are arranged at two sides of the valve core (3).