CN219549254U - Get-off support leg multi-way valve capable of enabling support legs to retract safely - Google Patents

Abstract

A lower support leg multi-way valve capable of enabling support legs to retract safely. Solves the problem that the existing supporting leg cannot be retracted reliably. The hydraulic control valve comprises a valve body, a main overflow valve, a first selection valve and a plurality of first landing leg working joints, wherein a main oil inlet, an oil return opening and a hydraulic cylinder small cavity interface are arranged on the valve body, the hydraulic control valve also comprises a third selection valve, a remote control overflow valve, a hydraulic control reversing valve and a working oil port, the main oil inlet is connected with the first selection valve and the main overflow valve, an oil outlet of the first selection valve is connected with the second selection valve, the third selection valve and the hydraulic cylinder small cavity interface respectively, the working oil port is connected with the oil return opening through the remote control overflow valve, and the hydraulic control reversing valve is provided with a first position and a closed second position, wherein a pilot control cavity of the remote control overflow valve is communicated with the oil return opening. The utility model also has the advantages of simple structure, convenient assembly, reliable action, long service life and the like.

Description

Get-off support leg multi-way valve capable of enabling support legs to retract safely

Technical Field

The utility model relates to a get-off multi-way valve, in particular to a get-off landing leg multi-way valve capable of enabling landing legs to retract safely.

Background

The automobile chassis plays an important role in engineering machinery, namely, the running cab and the upper operating room are arranged separately, so that the automobile chassis has the advantages of good maneuverability, convenience and rapidness in transition and the like, and the chassis can be supported by operating the supporting leg oil cylinder before the operation of the crane to provide a horizontal stable working platform for the upper operating mechanism, so that the automobile crane is an engineering machinery arranged on a common automobile chassis or a special automobile chassis and is widely applied.

As a hoisting special device, the truck crane also has the risk of accidents during operation. In a middle and small tonnage automobile crane, in order to make the structure more compact, a center revolving structure is generally arranged between two bridges and three bridges, so that the center of gravity of a chassis deviates from the center revolving structure and is positioned in the direction of a front supporting leg, and when the crane is hoisted in a front working area, the crane is easy to tip due to uneven gravity of the front part and the rear part of the center revolving structure. In order to improve the omnibearing working capacity of the automobile crane, a fifth supporting leg is usually required to be arranged at the front end (the bottom of an engine) of the automobile crane.

Detecting the flexible state of fifth landing leg, it is most in China to adopt the visual method, and operating personnel need judge through other people's help or by oneself to ground, because the fifth landing leg position is comparatively hidden, neglects easily and causes misjudgment, if this hoist of fifth landing leg non-withdrawal is in the state of traveling again can cause the damage of the bruising of landing leg even the damage of vehicle, has very big potential safety hazard.

Disclosure of Invention

In order to solve the problem that the existing supporting leg cannot be reliably retracted in the background art, the utility model provides the lower supporting leg multi-way valve capable of enabling the supporting leg to be retracted safely.

The technical scheme of the utility model is as follows: the utility model provides a make landing leg multichannel valve of going down of landing leg safety retract, includes valve body, main overflow valve, first selection valve and a plurality of first landing leg work allies oneself with, every first landing leg work allies oneself with including the big chamber interface of second selection valve, the big chamber interface of vertical cylinder that links to each other with the second selection valve, the big chamber interface of horizontal cylinder that links to each other with the second selection valve, the valve body on be equipped with main oil inlet, oil return opening, the little chamber interface of pneumatic cylinder, still include third selection valve, remote control overflow valve, hydraulically controlled switching-over valve and work hydraulic fluid port, main oil inlet link to each other with first selection valve, main overflow valve, the oil-out of first selection valve link to each other with second selection valve, third selection valve, little chamber interface of pneumatic cylinder respectively, the work hydraulic fluid port link to each other with the oil return opening through the remote control overflow valve, hydraulically controlled switching-over valve have the first position and the second position of closing that open and make the pilot control chamber and the oil return opening of remote control overflow valve be linked together.

As a further development of the utility model, the first selector valve has a first position in which the leg is extended, a second position in which the leg is retracted, and a third position in which the pilot operated directional valve is in the first position when the first selector valve is in the third position.

As a further improvement of the utility model, the pilot control chamber of the remote control overflow valve is connected with the oil return port through the hydraulic control reversing valve and the first selection valve when the first selection valve is in the third position.

As a further improvement of the utility model, the opening pressure of the main relief valve is larger than the opening pressure when the pilot control cavity of the remote relief valve is full of control oil, and the opening pressure when the pilot control cavity of the remote relief valve is full of control oil is larger than the opening pressure when the pilot control cavity of the remote relief valve is communicated with the oil return port.

As a further improvement of the utility model, the working oil port is communicated with the pilot control cavity of the remote control overflow valve through an orifice.

As a further improvement of the utility model, when the first selector valve is in the first position and the second position, the small cavity interface of the hydraulic cylinder is communicated with the oil return port through the first selector valve.

As a further improvement of the utility model, the valve body is provided with a vehicle passing interface, and the main oil inlet is communicated with the vehicle passing interface when the first selection valve is positioned at the second position.

As a further improvement of the utility model, the valve body is integrally molded by casting.

As a further improvement of the utility model, the hydraulic control reversing valve comprises a hydraulic control cavity and a spring cavity, the hydraulic control cavity and the spring cavity are matched with each other to control the opening of the hydraulic control reversing valve, the hydraulic control cavity is connected with a small cavity interface of the hydraulic cylinder, an elastic piece for driving the hydraulic control reversing valve to tend to move towards the second position is arranged in the spring cavity, and a pilot control cavity of the remote control overflow valve is communicated with the hydraulic control reversing valve when the hydraulic control reversing valve is positioned at the first position.

As a further improvement of the utility model, each first supporting leg working link is provided with a one-way valve, the valve body is provided with a pressure limiting valve, and an oil outlet of the one-way valve is connected with an oil return port through the pressure limiting valve.

The utility model has the beneficial effects that the remote control overflow valve and the hydraulic control reversing valve are arranged, and the hydraulic control reversing valve and the remote control overflow valve are matched for use, so that the preferential automatic retraction of the fifth supporting leg is realized, and the unnecessary loss or casualties caused by manual misoperation without retracting the fifth supporting leg are avoided. The utility model also has the advantages of simple structure, convenient assembly, reliable action, long service life and the like.

Drawings

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

Fig. 2 is a schematic diagram of the hydraulic principle of an embodiment of the present utility model.

Fig. 3 is a schematic diagram of the hydraulic principle of the remote control relief valve according to the embodiment of the present utility model.

In the figure, 1, a valve body; 2. a main overflow valve; 3. a first selector valve; 4. the first supporting leg is connected with the work; 5. a second selector valve; 6. a third selection valve; 7. remote control overflow valve; 71. a pilot control chamber; 72. an orifice; 8. a hydraulically controlled reversing valve; 81. A hydraulic control cavity; 82. a spring cavity; 9. a one-way valve; 10. a pressure limiting valve; A. a horizontal cylinder large cavity interface; B. a vertical cylinder large cavity interface; C. a working oil port; p, a main oil inlet; o, an oil return port; H. a small cavity interface of the hydraulic cylinder; v, connecting the on-vehicle interface.

Detailed Description

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

the lower landing leg multi-way valve for safely retracting the landing leg is shown by combining fig. 1 with fig. 2-3 and comprises a valve body 1, a main overflow valve 2, a first selection valve 3 and a plurality of first landing leg working links 4, wherein each first landing leg working link 4 comprises a second selection valve 5, a vertical cylinder large cavity interface B connected with the second selection valve 5 and a horizontal cylinder large cavity interface A connected with the second selection valve 5, a main oil inlet P, an oil return port O and a hydraulic cylinder small cavity interface H are arranged on the valve body 1, and the lower landing leg multi-way valve is characterized by further comprising a third selection valve 6, a remote control overflow valve 7, a hydraulic control reversing valve 8 and a working oil port C, wherein the main oil inlet P is connected with the first selection valve 3 and the main overflow valve 2, an oil outlet of the first selection valve 3 is respectively connected with the second selection valve 5, the third selection valve 6 and the hydraulic cylinder small cavity interface H, the working oil port C is connected with the oil return port O through the remote control overflow valve 7, and the hydraulic control reversing valve 8 is provided with a first position which is opened to enable the oil return port 71 of the overflow valve 7 to be communicated with the first position and the closed position of the pilot control cavity O. The utility model has the beneficial effects that the remote control overflow valve and the hydraulic control reversing valve are arranged, and the hydraulic control reversing valve and the remote control overflow valve are matched for use, so that the preferential automatic retraction of the fifth supporting leg is realized, and the unnecessary loss or casualties caused by manual misoperation without retracting the fifth supporting leg are avoided. The utility model also has the advantages of simple structure, convenient assembly, reliable action, long service life and the like. Specifically, the first leg work unit comprises four second selector valves, and each second selector valve correspondingly controls one leg. The third selection valve is used for controlling the fifth supporting leg, the second overflow valve of the fifth supporting leg adopts the remote control overflow valve, and the opening pressure of the main overflow valve is controlled remotely through the change of the control pressure of the remote control port, so that the use condition is enriched. By updating the new principle of the get-off multi-way valve, the hydraulic control reversing valve and the remote control overflow valve are matched for use, so that the preferential automatic retraction of the fifth supporting leg is realized, and unnecessary loss or casualties caused by manual misoperation without retracting the fifth supporting leg are avoided.

The first selector valve 3 has a first position in which the support leg extends, a second position in which the support leg is neutral, and a third position in which the support leg is retracted, and the pilot operated directional valve 8 is in the first position when the first selector valve 3 is in the third position. Specifically, the pilot control chamber 71 of the remote control relief valve 7 is connected to the oil return port O through the pilot operated directional valve 8 and the first selector valve 3 when the first selector valve 3 is in the third position. When the operation ends and the landing leg is retracted, even if the fifth landing leg is misoperation, the working valve rod (the third selection valve) is still in the middle position or the wrong selection gear, the main control reversing valve rod (the first selection valve) is moved to the retraction gear (the third position), at the moment, the pilot control cavity 71 of the remote control overflow valve 7 is connected with the oil return port O through the hydraulic control reversing valve 8 and the first selection valve 3, and the fifth landing leg is also preferentially and automatically retracted; specifically, when the remote control port (pilot control cavity) of the overflow valve is connected with the oil return box port, the pressure oil in the large cavity (working oil port C) of the oil cylinder of the fifth support leg can be unloaded by opening the remote control overflow valve with a smaller pressure value, the fifth support leg is retracted, the energy consumption is low, and the third selection valve is not required to be operated, so that unnecessary loss or casualties caused by manual misjudgment of not retracting the fifth support leg are effectively avoided.

The opening pressure of the main relief valve 2 is larger than the opening pressure when the pilot control cavity 71 of the remote relief valve 7 is full of control oil, and the opening pressure when the pilot control cavity 71 of the remote relief valve 7 is full of control oil is larger than the opening pressure when the pilot control cavity 71 of the remote relief valve 7 is communicated with the oil return port O. Specifically, when the pilot control cavity of the remote control relief valve is connected with the port B1 (namely the working oil port C), the remote control relief valve ensures the safety of the oil path of the supporting leg, and relief is realized when the oil path exceeds the set pressure of the remote control relief valve. When hydraulic oil in a pilot control cavity of the remote control overflow valve passes through the hydraulic control reversing valve and returns to the oil tank, the remote control overflow valve is equivalent to a one-way valve with small spring pressure, and the pressure oil of a working oil port of the supporting leg can be unloaded at low pressure, so that energy consumption is reduced. Specifically, a two-position two-way hydraulic control reversing valve is added on the original integrally-cast get-off multi-way valve, the control port of the hydraulic control valve is connected with a small cavity control oil way H of the hydraulic cylinder, when the control oil way H for controlling the retraction of the fifth supporting leg oil cylinder does not have pressure, the pilot control cavity of the remote control overflow valve is closed, the inlet pressure of the remote control overflow valve exceeds the set pressure, and the main valve core of the remote control overflow valve is opened to enter an overflow state for overload protection.

When the control oil way H (namely the small cavity interface of the hydraulic cylinder) generates pressure, the hydraulic control reversing valve reverses, the pilot control cavity of the remote control overflow valve is opened, the pilot oil is directly returned to the oil tank, the pressure difference at the two ends of the main valve core of the remote control overflow valve is caused, the main valve opens overflow, the system is unloaded with an extremely low pressure drop, and the fifth supporting leg is retracted.

The working oil port C is communicated with a pilot control cavity 71 of the remote control relief valve 7 through an orifice 72. Therefore, the remote control overflow valve can be controlled by the pilot oil, and the energy consumption is reduced.

When the first selector valve 3 is in the first position and the second position, the small cavity interface H of the hydraulic cylinder is communicated with the oil return port O through the first selector valve 3.

The valve body 1 is provided with a vehicle passing interface V, and the main oil inlet P is communicated with the vehicle passing interface V when the first selector valve 3 is positioned at the second position. The structure is convenient for the boarding action.

The valve body 1 is integrally molded by casting. Specifically, the valve body is formed by integral casting, so that the product is convenient to process, the weight of the product is reduced, the production cost is reduced, the through-flow capacity of the product is improved, and the pressure loss of the system is reduced.

The hydraulic control reversing valve 8 comprises a hydraulic control cavity 81 and a spring cavity 82, the hydraulic control cavity 81 and the spring cavity 82 are matched with each other to control the opening of the hydraulic control reversing valve 8, the hydraulic control cavity 81 is connected with a small cavity interface H of the hydraulic cylinder, an elastic piece which drives the hydraulic control reversing valve 8 to tend to move towards a second position is arranged in the spring cavity 82, and a pilot control cavity 71 of the remote control overflow valve 7 is communicated with the hydraulic control reversing valve 8 when the hydraulic control reversing valve 8 is positioned at a first position.

Each first supporting leg working link 4 is provided with a one-way valve 9, the valve body 1 is provided with a pressure limiting valve 10, and an oil outlet of the one-way valve 9 is connected with an oil return port O through the pressure limiting valve 10. The structure ensures that the other supporting legs are convenient and reliable to control, and the system safety is higher.

The principle of the utility model is further explained by referring to the attached drawings, a pressure oil inlet P is connected with an oil return port O through a main overflow valve, and meanwhile, the pressure oil inlet P is communicated with a small cavity interface H of a hydraulic cylinder, an on-vehicle interface V and 5 working link oil inlets through a first selection valve (5 working links respectively control 5 supporting legs, wherein the first supporting leg working link is four and can be described as a first supporting leg, a second supporting leg, a third supporting leg and a fourth supporting leg; an outlet of the fifth landing leg selection valve (a third selection valve) is communicated with a large cavity B1 (namely a working oil port C) of the vertical hydraulic cylinder; the two outlets on the other four-way selector valves are communicated with the respective vertical cylinder large cavity interfaces B2, B3, B4 and B5 and the horizontal cylinder large cavity interfaces A2, A3, A4 and A5. Each horizontal cylinder large cavity A2, A3, A4 and A5 is respectively communicated with a corresponding one-way valve, and each one-way valve is further communicated with an oil return port O through a horizontal cylinder large cavity pressure limiting valve 10.

The fifth support leg working link is provided with a remote control overflow valve, an oil inlet of the remote control overflow valve is communicated with a working oil port C, an oil drain port is communicated with an oil return port O, and a remote control port (a pilot control cavity 71) is communicated with the hydraulic control reversing valve. When the operation is finished, the landing leg is retracted, the fifth landing leg selection valve (the third selection valve) is in the middle position or the wrong gear Y4 due to misoperation of the artificial factors, and the large cavity (the working oil port C) of the vertical hydraulic cylinder of the fifth landing leg is closed and cannot return oil. And moving the total control reversing valve (the first selector valve) to a 'retraction' Y2 position, enabling pressure oil to enter the hydraulic cylinder small cavity interface H through the total control reversing valve and reach the hydraulic control cavity 81 of the hydraulic control reversing valve, and reversing and communicating the hydraulic control valve when the pressure of the hydraulic control cavity 81 is larger than the set pressure of the hydraulic control reversing valve. At the moment, a remote control port (a pilot control cavity) of the remote control overflow valve is communicated with an oil return port O through a hydraulic control reversing valve. The hydraulic oil is directly returned to the oil tank from the remote control port through the damping hole on the main valve core of the remote control overflow valve, the pilot oil can not open the pilot valve port of the overflow valve, at the moment, the remote control overflow valve is similar to a one-way valve with lower opening pressure, and the two ends of the main valve core of the remote control overflow valve generate pressure difference, so that the main valve core opens overflow, the hydraulic oil in the large vertical cylinder cavity B1 (the large vertical cylinder cavity of the fifth supporting leg, the hydraulic oil port C is used for the convenience of description) is unloaded with an extremely low pressure drop, and the fifth supporting leg is retracted.

When the operation stretches out the fifth landing leg, the third selection valve is pushed to the Y3 position, the total control reversing valve is pushed to the 'stretching' Y1 position, at the moment, the control cavity of the hydraulic control reversing valve is communicated with the oil return port O through the total control reversing valve, the hydraulic control reversing valve is closed in a two-way manner, the remote control port of the remote control overflow valve is closed, the inlet pressure of the overflow valve exceeds the set pressure, the pilot valve port is opened, the main valve core is opened to overflow, and overload protection is carried out.

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 (10)

1. The lower support leg multi-way valve capable of enabling support legs to retract safely comprises a valve body (1), a main overflow valve (2), a first selection valve (3) and a plurality of first support leg working linkages (4), wherein each first support leg working linkage (4) comprises a second selection valve (5), a vertical cylinder large cavity interface (B) connected with the second selection valve (5), a horizontal cylinder large cavity interface (A) connected with the second selection valve (5), a main oil inlet (P), an oil return port (O) and a hydraulic cylinder small cavity interface (H) are arranged on the valve body (1), and the lower support leg multi-way valve is characterized by further comprising a third selection valve (6), a remote control overflow valve (7), a hydraulic control reversing valve (8) and a working oil port (C), wherein the main oil inlet (P) is connected with the first selection valve (3) and the main overflow valve (2), the oil outlet of the first selection valve (3) is connected with the second selection valve (5), the third selection valve (6) and the hydraulic cylinder small cavity interface (H) respectively, and the working oil port (C) is connected with the second selection valve (7) through the oil return port (7) and the position of the remote control reversing valve (7) is communicated with the second overflow valve (71).

2. A drop leg multiplex valve for providing a safe retraction of a leg according to claim 1, wherein said first selector valve (3) has a first position for extending the leg, a neutral second position and a third position for retracting the leg, said pilot operated directional valve (8) being in the first position when said first selector valve (3) is in the third position.

3. The lower support leg multi-way valve for enabling the support legs to retract safely according to claim 2 is characterized in that a pilot control cavity (71) of the remote control overflow valve (7) is connected with an oil return port (O) through a hydraulic control reversing valve (8) and the first selection valve (3) when the first selection valve (3) is in a third position.

4. A lower leg multiple-way valve for enabling a leg to retract safely according to claim 1, 2 or 3, wherein the opening pressure of the main relief valve (2) is larger than the opening pressure when the pilot control cavity (71) of the remote relief valve (7) is filled with control oil, and the opening pressure when the pilot control cavity (71) of the remote relief valve (7) is filled with control oil is larger than the opening pressure when the pilot control cavity (71) of the remote relief valve (7) is communicated with the oil return port (O).

5. The lower support leg multi-way valve for safely retracting the support legs is characterized in that the working oil port (C) is communicated with a pilot control cavity (71) of the remote control overflow valve (7) through an orifice (72).

6. The lower support leg multi-way valve for safely retracting the support legs is characterized in that when the first selector valve (3) is in a first position and a second position, the small cavity interface (H) of the hydraulic cylinder is communicated with the oil return port (O) through the first selector valve (3).

7. The multi-way valve for the lower support legs, which enables the support legs to retract safely, is characterized in that the valve body (1) is provided with a vehicle passing interface (V), and the main oil inlet (P) is communicated with the vehicle passing interface (V) when the first selector valve (3) is in the second position.

8. The lower support leg multi-way valve for safely retracting the support legs is characterized in that the valve body (1) is integrally molded by casting.

9. The lower support leg multi-way valve for safely retracting the support legs is characterized in that the hydraulic control reversing valve (8) comprises a hydraulic control cavity (81) and a spring cavity (82), the hydraulic control cavity (81) and the spring cavity (82) are matched with each other to control the opening of the hydraulic control reversing valve (8), the hydraulic control cavity (81) is connected with a small hydraulic cylinder cavity interface (H), an elastic piece which drives the hydraulic control reversing valve (8) to tend to move towards a second position is arranged in the spring cavity (82), and a pilot control cavity (71) of the remote control overflow valve (7) is communicated with the hydraulic control reversing valve (8) when the hydraulic control reversing valve (8) is in a first position.

10. The get-off leg multiway valve for enabling the legs to retract safely according to claim 1 is characterized in that a one-way valve (9) is arranged on each first leg working unit (4), a pressure limiting valve (10) is arranged on the valve body (1), and an oil outlet of the one-way valve (9) is connected with an oil return port (O) through the pressure limiting valve (10).