Supporting leg hydraulic system of wheel excavator

Abstract

The utility model belongs to the technical field of excavator hydraulic systems, and particularly discloses a wheel type excavator landing leg hydraulic system which comprises a landing leg oil cylinder, a reversing valve, a hydraulic pipeline and an electric control duplex stop valve, the landing leg oil cylinder comprises a rod cavity and a rodless cavity, and the rod cavity and the rodless cavity are respectively provided with an oil port. The reversing valve is connected with rodless cavity oil ports of the two supporting leg oil cylinders through an electric control duplex stop valve. According to the utility model, the electric control duplex stop valve is additionally arranged on the hydraulic pipeline between the reversing valve and the oil cylinder of the original hydraulic system, so that the oil inlet quantity and the oil return quantity of the oil cylinders of the two supporting legs can be independently controlled, and the actions of the two supporting legs can be respectively controlled; finally, the problem that an existing wheel excavator is difficult to stably support when working on a rugged road surface is solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to excavator hydraulic system technical field, especially relates to a wheeled excavator outrigger hydraulic system. BACKGROUND

[0002] The outrigger can keep the wheeled excavator stable during work, and the existing chassis outrigger hydraulic system of the wheeled excavator is connected with the reversing valve simultaneously for two outrigger cylinders, so that the oil inlet amount and the oil return amount of the two cylinders are same, and therefore the two outriggers can only act simultaneously. The working condition of the current wheeled excavator is not always on the stable road surface, and when the wheeled excavator is on the rugged road surface, the two outriggers of the chassis working device need to act independently, and the two outriggers are adjusted to different support angles, so as to enhance the stability of the working posture. At present, the function of the independent action of the outrigger needs to be added on the basis of the chassis hydraulic system of the original wheeled excavator, so as to cope with various working condition requirements in the market. SUMMARY

[0003] The utility model aims at providing a wheeled excavator outrigger hydraulic system, which can at least solve one of the above technical problems.

[0004] In order to achieve the above-mentioned purpose, one or more embodiments of the utility model provide a wheeled excavator outrigger hydraulic system, which comprises two outrigger cylinders, a reversing valve, an electric control double block valve, a first hydraulic pipeline, a second hydraulic pipeline, a third hydraulic pipeline, a fourth hydraulic pipeline and a hydraulic lock. The outrigger cylinder comprises a rod cavity and a rodless cavity, and each of the rod cavity and the rodless cavity has one oil port. The reversing valve is connected with the electric control double block valve, and the electric control double block valve is connected with the rodless cavity oil ports of the two outrigger cylinders.

[0005] Further, the reversing valve comprises two working oil ports, and each of the two ends of the electric control double block valve has two oil ports.

[0006] Further, the two working oil ports of the reversing valve are connected with one end of the first hydraulic pipeline and the second hydraulic pipeline respectively.

[0007] Further, the other end of the second hydraulic pipeline is divided into two branches and connected with the rod cavity oil ports of the two outrigger cylinders.

[0008] Further, the other end of the first hydraulic pipeline is divided into two branches and connected with the two oil ports at one end of the electric control double block valve.

[0009] Further, the two oil ports at the other end of the electric control double block valve are connected with one end of the third hydraulic pipeline and the fourth hydraulic pipeline respectively.

[0010] Further, the other end of the third hydraulic pipeline and the fourth hydraulic pipeline is connected with the rodless cavity oil ports of the two outrigger cylinders respectively.

[0011] Further, the hydraulic lock is composed of four one-way valves.

[0012] Further, the four one-way valves are arranged on the third hydraulic pipeline, the fourth hydraulic pipeline and two second hydraulic pipeline branches.

[0013] Further, the four one-way valves are arranged on the third hydraulic pipeline, the fourth hydraulic pipeline and two second hydraulic pipeline branches.

[0014] The beneficial effects of one or more of the above technical solutions are:

[0015] The utility model discloses a hydraulic system reversing valve and the hydraulic pipeline between the outrigger cylinder rodless cavity oil port increase one electric control double stop valve, realize the oil inlet or the oil return of two outrigger cylinders can be controlled independently, and then realize two outrigger of the wheel excavator can be controlled independently and act independently, finally solve the problem that two outrigger of the wheel excavator can not realize different support angle and be difficult to support stably when operating on the rugged road. BRIEF DESCRIPTION OF DRAWINGS

[0016] In the drawings, the size and the proportion do not represent the size and the proportion of actual product. The drawings are merely illustrative, and some unnecessary elements or features are omitted for the sake of clarity.

[0017] Figure 1 For the improvement front wheel excavator outrigger cylinder hydraulic system structure diagram.

[0018] Figure 2 For the improvement front wheel excavator outrigger cylinder hydraulic system hydraulic principle diagram.

[0019] Figure 3 For the utility model wheel excavator outrigger cylinder hydraulic system structure diagram.

[0020] Figure 4 For the utility model wheel excavator outrigger cylinder hydraulic system hydraulic principle diagram.

[0021] In the drawing, 1, electric control double stop valve, 2, reversing valve, 3, rod cavity, 4, rodless cavity, 5, one-way valve, 6, first hydraulic pipeline, 7, second hydraulic pipeline, 8, third hydraulic pipeline, 9, fourth hydraulic pipeline. DETAILED DESCRIPTION

[0022] The utility model will be further described below in connection with the drawings and examples.

[0023] It should be noted that the following detailed description is exemplary, and is intended to provide further description of the utility model. Unless otherwise specified, all technical and scientific terms used in this paper have the same meaning as that generally understood by ordinary skilled persons in the technical field to which the utility model belongs.

[0024] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used in this description, the singular forms“a,”“an,” and“the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms“comprises” and / or“comprising,” when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0025] In the present application, the terms such as“upper”,“lower”,“side”,“bottom” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only a relationship word determined for the purpose of conveniently describing the structural relationship of the components or elements of the present application, and is not intended to specify any component or element in the present application, and cannot be understood as a limitation of the present application.

[0026] In the present application, the terms such as“connection” and the like should be broadly understood, which means that it can be fixedly connected, integrally connected or detachably connected; it can be directly connected or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be determined according to the specific circumstances, and cannot be understood as a limitation of the present application.

[0027] In the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0028] As shown in Figure 1 , Figure 2 , the existing wheel excavator outrigger oil cylinder hydraulic system is connected to one end of the first hydraulic pipeline 6 and the second hydraulic pipeline 7 through the reversing valve 2, the other end of the first hydraulic pipeline 6 is connected to the rodless cavity 4 oil port of the two outrigger oil cylinders through two branches, and the other end of the second hydraulic pipeline 7 is connected to the rod cavity 3 oil port of the two outrigger oil cylinders through two branches. Therefore, the oil inlet and oil return of the first outrigger oil cylinder and the second outrigger oil cylinder can only be synchronized, and the actions of the two outriggers can only be synchronized, and cannot be individually actuated.

[0029] One or more embodiments of the present application provide a wheel excavator outrigger hydraulic system, an electrically controlled double block valve 1 is arranged between the oil port of the rodless cavity 4 and the connecting oil path of the reversing valve 2, so that the oil inlet and oil return of the rodless cavity 4 of the two outrigger oil cylinders are controlled respectively, the two outriggers can be individually actuated, and when passing through a rugged road, the two outriggers of the wheel excavator can be individually actuated to adapt to the road, so that the wheel excavator is more stable during operation.

[0030] As shown in Figure 3 , Figure 4As shown, the hydraulic oil circuit is connected with one end of the first hydraulic pipeline 6 and the second hydraulic pipeline 7 through the reversing valve 2, the first hydraulic pipeline 6 is divided into two branches and connected with two oil inlets of one end of the electric control double stop valve 1, the second hydraulic pipeline 7 is divided into two branches and connected with the rod cavity 3 oil port of the two branch leg oil cylinders.

[0031] The specific implementation process of the branch leg hydraulic system is that when the working state of the reversing valve 2 is that the oil is imported into the rod cavity 3 connected with the second hydraulic pipeline 7, the oil is returned from the rodless cavity 4 connected with the third hydraulic pipeline 8 and the fourth hydraulic pipeline 9, the piston is retracted to the rodless cavity 4 direction, and the branch leg is lifted up. The third hydraulic pipeline 8 and the fourth hydraulic pipeline 9 are connected with the reversing valve 2 through the electric control double stop valve 1, so that the oil return amount of the rodless cavity 4 of the two branch leg oil cylinders can be controlled respectively by adjusting the electric control double stop valve 1, the retraction amount of the piston is controlled respectively, and therefore the action amplitude of the branch leg is controlled respectively. When the working state of the reversing valve 2 is that the oil is returned from the rod cavity 3 connected with the second hydraulic pipeline 7, the oil is imported into the rodless cavity 4 connected with the third hydraulic pipeline 8 and the fourth hydraulic pipeline 9, the piston is extended to the rod cavity 3 direction, and the branch leg is lowered. The third hydraulic pipeline 8 and the fourth hydraulic pipeline 9 are connected with the reversing valve 2 through the electric control double stop valve 1, so that the oil import amount of the two branch leg oil cylinders can be controlled respectively, the extension amount of the piston is controlled respectively, and therefore the action amplitude of the branch leg is controlled respectively.

[0032] By arranging the electric control double stop valve 1 between the reversing valve 2 and the branch leg oil cylinder, the oil import amount and the oil return amount of the two oil cylinders are controlled individually, so that the action of the two branch legs is controlled individually, and the two branch legs can be respectively actuated to form different support angles, thereby ensuring the stability of the wheel excavator working on the rugged ground.

[0033] The branch leg hydraulic system further comprises a hydraulic lock, and the hydraulic lock is composed of four one-way valves 5, which are arranged on the third hydraulic pipeline 8, the fourth hydraulic pipeline 9 and the two branches of the second hydraulic pipeline 7 respectively. The installation direction of the four one-way valves 5 is that the oil outlet of the one-way valve 5 faces the oil port of the branch leg oil cylinder. The one-way valve 5 can prevent the hydraulic oil entering the branch leg oil cylinder from flowing back to cause the piston rod to move and affect the operation stability of the wheel excavator.

[0034] The protection scope of the utility model is only limited by the claims. Thanks to the teaching of the utility model, those skilled in the art can easily recognize that the alternative structure of the disclosed structure of the utility model can be used as a feasible alternative embodiment, and the disclosed embodiments of the utility model can be combined to produce new embodiments, which also fall within the scope of the appended claims.

Claims

1. A hydraulic system for a support leg of a wheel excavator, characterized in that The utility model relates to a hydraulic system of a two-axle trailer, comprising: Two outrigger cylinders, a reversing valve, an electrically controlled double block valve, a first hydraulic line, a second hydraulic line, a third hydraulic line, a fourth hydraulic line, and a hydraulic lock, wherein the outrigger cylinders comprise a rod cavity and a rodless cavity, each of which has an oil port, the reversing valve is connected to the electrically controlled double block valve, and the electrically controlled double block valve is connected to the rodless cavity oil ports of the two outrigger cylinders.

2. The wheel excavator support leg hydraulic system as recited in claim 1, wherein, The reversing valve comprises two working oil ports, and the electrically controlled double block valve has two oil ports at each end.

3. The hydraulic support leg system for a wheel excavator as claimed in claim 2, characterized in that, The two working oil ports of the reversing valve are respectively connected to one end of the first hydraulic line and the second hydraulic line.

4. The wheel excavator support leg hydraulic system as recited in claim 3, wherein, The other end of the second hydraulic line is divided into two branches to connect the rod cavity oil ports of the two outrigger cylinders.

5. The wheel excavator support leg hydraulic system as recited in claim 3, wherein, The other end of the first hydraulic line is divided into two branches to connect the two oil ports at one end of the electrically controlled double block valve.

6. The wheel excavator support leg hydraulic system as recited in claim 5, wherein, The two oil ports at the other end of the electrically controlled double block valve are respectively connected to one end of the third hydraulic line and the fourth hydraulic line.

7. The wheel excavator support leg hydraulic system as recited in claim 6, wherein, The other end of the third hydraulic line and the fourth hydraulic line is respectively connected to the rodless cavity oil ports of the two outrigger cylinders.

8. The wheel excavator support leg hydraulic system as claimed in claim 1, characterized by, The hydraulic lock is composed of four check valves.

9. The wheel excavator support leg hydraulic system as recited in claim 8, wherein, The four check valves are arranged on the third hydraulic line, the fourth hydraulic line, and the two branches of the second hydraulic line.

10. The wheel excavator support leg hydraulic system as claimed in claim 8, characterized in that, The four check valves are installed with the outlet oil ports of the check valves facing the oil ports of the outrigger cylinders.

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