Wheel excavator chassis working hydraulic system and excavator

Abstract

The utility model discloses a wheel excavator chassis working hydraulic system and an excavator, which relate to the technical field of hydraulic control and comprise a dozer blade oil cylinder, a supporting leg oil cylinder, a dozer blade stop valve, a first supporting leg stop valve, a second supporting leg stop valve and an electromagnetic switching valve, an oil port A of the electromagnetic switching valve is connected with rodless cavities of the dozer blade oil cylinder and the supporting leg oil cylinder through a dozer blade stop valve and a first supporting leg stop valve respectively; an oil port B of the electromagnetic switching valve is respectively connected with rodless cavities of the dozer blade oil cylinder and the supporting leg oil cylinder through a second supporting leg stop valve; any action combination mode of the bulldozing blade, the left supporting leg and the right supporting leg can be achieved, the supporting angle of the wheel excavator can be adjusted in time under the rugged working condition, the working stability of the whole excavator is effectively improved, and control is easy and convenient.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic control technology, specifically to a working hydraulic system for a wheeled excavator chassis and the excavator itself. Background Technology

[0002] Wheeled excavators are highly maneuverable and widely used in road construction and other fields. The chassis of a wheeled excavator is typically equipped with a bulldozer blade and retractable left and right outriggers. The power for the bulldozer blade and the outriggers comes from the bulldozer blade cylinder and the outrigger cylinder, respectively. The outrigger cylinders are usually installed on the left and right sides at the front or rear of the vehicle to control the movement of the left and right outriggers.

[0003] The existing wheeled excavator chassis can only have its left and right outriggers working at the same time. When facing complex road conditions or rugged mountain roads, it is impossible for the outriggers to reach a stable support point at the same time, which can easily lead to problems such as unstable center of gravity and machine tipping over.

[0004] The existing hydraulic control system for the outriggers and bulldozer blades of wheeled excavators uses a pilot valve, pressure switch, shuttle valve, and main valve to achieve simultaneous or individual operation of each cylinder. This allows for adjustment of each cylinder as needed when working on uneven surfaces, thereby improving operational stability and comfort. However, this method has drawbacks: the control program is complex, the functional valves mostly use electromagnetic proportional directional valves, which are expensive and have high maintenance costs. Utility Model Content

[0005] To address the shortcomings of the existing technology, this utility model provides a working hydraulic system for a wheeled excavator chassis and an excavator. The support angle can be adjusted by the individual movement of the outriggers, which can improve the stability of the machine in rugged working conditions. It solves the problem that traditional wheeled excavators cannot adjust the support angle when dealing with various working environments and road conditions. Furthermore, the system has a simple structure, low cost, and is easy to maintain.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A working hydraulic system for a wheeled excavator chassis includes a bulldozer blade cylinder, outrigger cylinders, a bulldozer blade shut-off valve, a first outrigger shut-off valve, a second outrigger shut-off valve, and a solenoid switching valve. The oil port A of the solenoid switching valve is connected to the rodless chambers of the bulldozer blade cylinder and the outrigger cylinder via the bulldozer blade shut-off valve and the first outrigger shut-off valve, respectively. The oil port B of the solenoid switching valve is connected to the rodless chambers of the bulldozer blade cylinder and the outrigger cylinder via the second outrigger shut-off valve, respectively.

[0008] The movement and reversing of the bulldozer blade cylinder and outrigger cylinder are controlled by an electromagnetic switching valve.

[0009] As a further implementation, a main pump is also included, which is connected to the oil port P of the solenoid switching valve for supplying oil to the system.

[0010] As a further implementation, the outlet of the main pump is connected to an overflow valve, which is connected to the oil tank and used to control the upper limit of the system's working pressure.

[0011] As a further implementation, the electromagnetic switching valve is a two-position four-way electromagnetic valve, which facilitates the control of the switching of the hydraulic cylinder's actions.

[0012] As a further implementation, the oil port T of the electromagnetic switching valve is connected to the oil tank.

[0013] As a further implementation, a hydraulic lock for outriggers is provided between the outrigger cylinder and the outrigger shut-off valve. The hydraulic lock for outriggers includes a first check valve and a second check valve. One end of the first check valve is connected to the rodless chamber of the outrigger cylinder, and the other end is connected to the first outrigger shut-off valve. One end of the second check valve is connected to the rod chamber of the outrigger cylinder, and the other end is connected to the second outrigger shut-off valve.

[0014] As a further implementation, the outrigger stop valve and the bulldozer blade stop valve are both two-position two-way solenoid valves, which have the advantages of simple structure, stable operation and high reliability.

[0015] As a further implementation, the outrigger cylinder includes a left outrigger cylinder and a right outrigger cylinder, and the left outrigger cylinder and the right outrigger cylinder are respectively connected to outrigger hydraulic locks and the second one-way valves in the two outrigger hydraulic locks are connected.

[0016] As a further implementation, the first outrigger stop valve and the second outrigger stop valve each include two parallel two-position two-way solenoid valves, which are respectively connected to the left outrigger cylinder and the right outrigger cylinder.

[0017] An excavator comprising a working hydraulic system for a wheeled excavator chassis as described in any of the preceding claims.

[0018] By adopting the above technical solution, the beneficial effects of this utility model are as follows:

[0019] 1. This utility model uses an electromagnetic switching valve connected to the two oil chambers of the bulldozer blade cylinder and the outrigger cylinder respectively. By controlling the switching valve, the direction of the bulldozer blade or outrigger movement can be reversed, simplifying the control mode and improving the control efficiency of excavator accessories. At the same time, a bulldozer blade stop valve and an outrigger stop valve are provided. The three electromagnetic valves control the oil circuit of the bulldozer blade cylinder, the left outrigger cylinder and the right outrigger cylinder respectively, which can realize any combination of movement modes of the bulldozer blade, the left outrigger and the right outrigger. This is beneficial for wheeled excavators to adjust the support angle in a timely manner under rough working conditions, effectively improving the stability of the whole machine, and the control is simple and convenient.

[0020] 2. This utility model system has a simple structure, is easy to maintain, and has low cost. It can also cope with different working environments and road conditions, greatly improving the adaptability of the chassis working hydraulic system to the environment and ensuring the stability of the wheeled excavator during operation. Attached Figure Description

[0021] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0022] Figure 1 This is a schematic diagram of the system structure of an embodiment of the present utility model.

[0023] In the diagram: 1. Bulldozer blade cylinder; 2. Outrigger cylinder; 21. Left outrigger cylinder; 22. Right outrigger cylinder; 3. Bulldozer blade shut-off valve; 4. First outrigger shut-off valve; 5. Second outrigger shut-off valve; 6. Solenoid switching valve; 7. Outrigger hydraulic lock; 8. Bulldozer blade hydraulic lock; 9. Main pump; 10. Overflow valve; 11. Oil tank. Detailed Implementation

[0024] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0025] It should be noted that the terminology used herein is for descriptive purposes only and is not intended to limit the exemplary embodiments according to this invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0026] Example 1

[0027] In one typical embodiment of this application, a working hydraulic system for a wheeled excavator chassis is provided, such as... Figure 1 As shown, the device includes a bulldozer blade cylinder 1, an outrigger cylinder 2, a bulldozer blade shut-off valve 3, a first outrigger shut-off valve 4, a second outrigger shut-off valve 5, and a solenoid switching valve 6. The oil port A of the solenoid switching valve 6 is connected to the rodless chambers of the bulldozer blade cylinder 1 and the outrigger cylinder 2 via the bulldozer blade shut-off valve 3 and the first outrigger shut-off valve 4, respectively. The oil port B of the solenoid switching valve 6 is connected to the rodless chambers of the bulldozer blade cylinder 1 and the outrigger cylinder 2 via the second outrigger shut-off valve 5, respectively. The solenoid switching valve 6 controls the movement and reversing of the bulldozer blade cylinder 1 and the outrigger cylinder 2.

[0028] Specifically, such as Figure 1 As shown, the hydraulic system of the wheeled excavator chassis in this embodiment includes a bulldozer blade cylinder 1, outrigger cylinders 2, a bulldozer blade shut-off valve 3, a first outrigger shut-off valve 4, a second outrigger shut-off valve 5, a solenoid switching valve 6, a main pump 9, and an oil tank 11. There are two bulldozer blade cylinders 1, which operate synchronously. The outrigger cylinders 2 include a left outrigger cylinder 21 and a right outrigger cylinder 22 connected in parallel. The left outrigger cylinder 21 and the right outrigger cylinder 22 can operate synchronously or independently, controlled by the two outrigger shut-off valves.

[0029] In this embodiment, the bulldozer blade shut-off valve 3 is a single solenoid valve, and there are two outrigger shut-off valves, namely the first outrigger shut-off valve 4 and the second outrigger shut-off valve 5. The first outrigger shut-off valve 4 and the second outrigger shut-off valve 5 are both double solenoid valves, each including two two-position two-way solenoid valves, which can be connected to the left outrigger cylinder 21 and the right outrigger cylinder 22 respectively to form independent control.

[0030] like Figure 1 As shown, the solenoid switching valve 6 is a two-position four-way solenoid valve, including four ports: A, B, P, and T, facilitating the switching of cylinder movements. Port P of the solenoid switching valve 6 is connected to the outlet of the main pump, serving as an inlet for the main pump 9 to supply hydraulic oil to the system. Simultaneously, the outlet of the main pump 9 is also connected to a relief valve 10, which is connected to the oil tank 11 to control the upper limit of the hydraulic system's working pressure, ensuring safe operation. Port T of the solenoid switching valve 6 is connected to the oil tank 11, serving as an outlet.

[0031] In this embodiment, the oil port A of the electromagnetic switching valve 6 is connected to both the branch of the bulldozer blade cylinder 1 and the branch of the outrigger cylinder 2. On the branch of the bulldozer blade cylinder, oil port A is directly connected to one oil port of the bulldozer blade stop valve 3. The bulldozer blade stop valve 3 is a two-position two-way solenoid valve. The other oil port of the bulldozer blade stop valve 3 is connected to the rodless chamber of the bulldozer blade cylinder 1 through the bulldozer blade hydraulic lock 8. This allows the hydraulic oil supplied by the main pump to flow out from oil port A and then enter the rodless chamber of the bulldozer blade cylinder through the bulldozer blade stop valve and the bulldozer blade hydraulic lock. At this time, the hydraulic rod extends, and the bulldozer blade performs the extension action.

[0032] On the branch line of the outrigger cylinder, oil port A is directly connected to one oil port of the first outrigger shut-off valve 4. In this embodiment, in order to achieve separate control of the actions of the left and right outrigger cylinders, the first outrigger shut-off valve 4 adopts a double solenoid valve, which consists of two two-position two-way solenoid valves. Oil port A is connected to one end of the oil port of both two two-position two-way solenoid valves at the same time, and the other end of the oil port is connected to the rodless chamber of the left and right outrigger cylinders respectively through the outrigger hydraulic lock. After the hydraulic oil supplied by the pump flows out from oil port A, it can enter the left and right outrigger cylinders respectively through the first outrigger shut-off valve 4 and the outrigger hydraulic lock 7. At this time, the hydraulic rod extends, and both the left and right outriggers of the chassis perform the extension action. When the left and right outriggers need to act separately, they can be controlled by opening and closing the two two-position two-way solenoid valves.

[0033] In this embodiment, the oil port B of the electromagnetic switching valve 6 is directly connected to the second outrigger shut-off valve 5. The second outrigger shut-off valve, like the first outrigger shut-off valve, consists of two two-position two-way electromagnetic valves. One end of each of the two two-position two-way electromagnetic valves is directly connected to oil port B, and the other end is connected to the bulldozer blade cylinder 1 and the outrigger cylinder 2, respectively. Specifically, the oil port of one electromagnetic valve is connected to the rod chamber of the bulldozer blade cylinder through the bulldozer blade hydraulic lock, and the oil port of the other electromagnetic valve is connected to the rod chambers of the left and right outrigger cylinders through the outrigger hydraulic lock. This allows the hydraulic oil supplied by the main pump to flow out from the oil port B of the electromagnetic switching valve and enter the rod chambers of the bulldozer blade cylinder and the left and right outrigger cylinders, respectively. At this time, the hydraulic rod retracts, and the bulldozer blade and the left and right outriggers can perform the retraction action.

[0034] Specifically, such as Figure 1As shown, a bulldozer blade hydraulic lock 8 is provided at the bulldozer blade cylinder 1, and a support leg hydraulic lock 7 is provided at the support leg cylinder 2. The bulldozer blade hydraulic lock 8 and the support leg hydraulic lock 7 have the same structure. In this embodiment, the support leg hydraulic lock 7 includes two first check valves and two second check valves. One end of each of the two first check valves is connected to the rodless chamber of the left and right support leg cylinders, respectively, and the other end is connected to the first support leg shut-off valve 4. One end of each of the two second check valves is connected to the rod chamber of the left and right support leg cylinders, respectively, and the other end is connected to the second support leg shut-off valve 5. In this embodiment, the bulldozer blade hydraulic lock is provided to keep the piston rod of the bulldozer blade cylinder extended and not retracted when the bulldozer blade is performing bulldozing and outrigger operation, ensuring a more stable and reliable operation.

[0035] The working principle of this embodiment is as follows:

[0036] When the cylinder extends, the hydraulic oil output by the main pump 9 enters the rodless chamber of the cylinder through the bulldozer blade shut-off valve 3 and the first outrigger shut-off valve 4. At the same time, the hydraulic oil in the rod chamber of the cylinder returns to the oil tank 11 through the second outrigger shut-off valve 5. If you want to control the bulldozer blade to move independently while the outrigger does not move, you need to energize the first outrigger shut-off valve to cut off the oil circuit entering the rodless chamber of the outrigger cylinder. At this time, the bulldozer blade can be operated independently. Similarly, when the outrigger moves independently, you only need to energize the bulldozer blade shut-off valve to cut off the oil circuit of the bulldozer blade to achieve the function of independent outrigger operation.

[0037] When the hydraulic cylinder retracts, the solenoid switching valve 6 is energized and switched. The hydraulic oil output by the main pump 9 enters the rod chamber of the hydraulic cylinder through the solenoid switching valve 6 and the second outrigger shut-off valve 5. At the same time, the oil in the rodless chamber returns to the oil tank through the bulldozer blade shut-off valve 3 and the first outrigger shut-off valve 4. If you want to control the bulldozer blade to move independently while the outriggers do not move, you need to energize the outrigger solenoid valve to cut off the oil circuit entering the large chamber of the outrigger cylinder. At this time, the bulldozer blade can be operated independently. Similarly, when the outriggers are operated independently, you only need to energize the bulldozer blade shut-off valve to cut off the oil circuit of the bulldozer blade to achieve the function of independent outrigger operation.

[0038] When the support angle needs to be adjusted, the opening and closing of two two-position two-way solenoid valves in each outrigger stop valve are controlled to control the oil circuits entering the left and right outrigger cylinders respectively, so that the left and right outrigger cylinders extend to the appropriate length respectively, thereby achieving the effect of adjusting the support angle.

[0039] This embodiment also provides an excavator, which includes the above-mentioned wheeled excavator chassis working hydraulic system, which can effectively ensure the stability of the whole machine under rugged working conditions.

[0040] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it. Those skilled in the art should understand that this utility model can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A hydraulic system for a wheel excavator chassis, characterized in that The device includes a bulldozer blade cylinder, outrigger cylinders, a bulldozer blade shut-off valve, a first outrigger shut-off valve, a second outrigger shut-off valve, and a solenoid switching valve. The oil port A of the solenoid switching valve is connected to the rodless chambers of the bulldozer blade cylinder and the outrigger cylinder via the bulldozer blade shut-off valve and the first outrigger shut-off valve, respectively. The oil port B of the solenoid switching valve is connected to the rodless chambers of the bulldozer blade cylinder and the outrigger cylinder via the second outrigger shut-off valve, respectively.

2. The hydraulic system for a wheel excavator undercarriage according to claim 1, characterized in that, It also includes a main pump, which is connected to the oil port P of the solenoid switching valve to supply oil to the system.

3. The working hydraulic system of a wheeled excavator chassis as described in claim 2, characterized in that, The outlet of the main pump is connected to an overflow valve, which is connected to the oil tank.

4. The hydraulic system for a wheel excavator undercarriage according to claim 1, wherein The electromagnetic switching valve is a two-position four-way electromagnetic valve.

5. A hydraulic system for a wheel excavator undercarriage according to claim 4, c h a r a c t e r i s e d in that The oil port T of the electromagnetic switching valve is connected to the oil tank.

6. The undercarriage hydraulic system of a wheel excavator according to claim 1, wherein A hydraulic lock for outriggers is provided between the outrigger cylinder and the outrigger shut-off valve. The hydraulic lock for outriggers includes a first check valve and a second check valve. One end of the first check valve is connected to the rodless chamber of the outrigger cylinder, and the other end is connected to the first outrigger shut-off valve. One end of the second check valve is connected to the rod chamber of the outrigger cylinder, and the other end is connected to the second outrigger shut-off valve.

7. A hydraulic system for a wheel excavator undercarriage according to claim 6, c h a r a c t e r i s e d in that The outrigger cylinders include a left outrigger cylinder and a right outrigger cylinder. The left outrigger cylinder and the right outrigger cylinder are respectively connected to outrigger hydraulic locks, and the second check valves in the two outrigger hydraulic locks are connected.

8. A hydraulic system for a wheel excavator chassis as claimed in claim 7, characterised in that, The outrigger stop valve and the bulldozer blade stop valve are both two-position two-way solenoid valves.

9. A hydraulic system for a wheel excavator chassis as claimed in claim 8, characterised in that, The first outrigger shut-off valve and the second outrigger shut-off valve each include two parallel two-position two-way solenoid valves, which are respectively connected to the left outrigger cylinder and the right outrigger cylinder.

10. An excavator characterized by comprising: Includes a working hydraulic system for a wheeled excavator chassis as described in any one of claims 1-9.

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