Excavator auxiliary function hydraulic system and excavator

Abstract

The utility model discloses an auxiliary function hydraulic system of excavator, including oil tank, pump group, main valve, foot valve and replaceable auxiliary component, the first working oil port of main valve is connected with the first working oil port of auxiliary component, and the second working oil port of main valve is connected with the second working oil port of auxiliary component through switching valve, when switching valve is in first working position, the second working oil port of auxiliary component is connected with the second working oil port of main valve, and when switching valve is in second working position, the second working oil port of auxiliary component is connected with oil tank through filter and radiator. Filter and cooling treatment to hydraulic oil, improve hydraulic oil cleanliness, slow down equipment wear and tear and avoid blockage, avoid the oil leakage failure of the whole machine oil temperature high, applicable to different types of auxiliary component, improve applicability and reliability. The utility model discloses still a kind of excavator including above-mentioned auxiliary function hydraulic system of excavator.

Description

Technical Field

[0001] This utility model relates to the field of construction machinery, and in particular to a hydraulic system for excavator auxiliary functions. Furthermore, this utility model also relates to an excavator including the aforementioned hydraulic system for excavator auxiliary functions. Background Technology

[0002] To adapt to the complex environment of on-site construction, excavators are equipped with different types of auxiliary tools, such as hydraulic shears and hydraulic breakers, and different auxiliary tools have different requirements for the hydraulic system.

[0003] In existing technologies, to ensure the normal operation of auxiliary components, it is necessary to achieve oil inlet and return for these components. This can be achieved by directly installing an electrically controlled directional valve. However, excavators operate under high loads and continuous operation for extended periods, leading to concerns about reliability over time. Alternatively, oil inlet and return can be achieved through the main valve. However, if the excavator uses a hydraulic breaker as an auxiliary component, the hydraulic breaker's return oil flows directly through the main valve core. Due to the poor cleanliness of the hydraulic oil returning from the breaker, the main valve core inevitably wears down over extended operating time, and the main valve's throttle orifice becomes clogged, ultimately leading to main valve failure.

[0004] Therefore, how to provide a hydraulic system for excavator auxiliary functions that can stably operate different types of auxiliary components is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide a hydraulic system for excavator auxiliary functions, which, through a switching valve, enables different oil return methods when using different auxiliary components, thereby improving equipment reliability and applicability. Another purpose of this invention is to provide an excavator incorporating the aforementioned hydraulic system for excavator auxiliary functions.

[0006] To solve the above-mentioned technical problems, this utility model provides a hydraulic system for excavator auxiliary functions, including an oil tank, a pump set, a main valve, a foot valve, and replaceable auxiliary components. The oil inlet of the pump set is connected to the oil tank, and the oil outlet of the pump set is connected to the oil inlet of the main valve and the oil inlet of the foot valve, respectively. The working oil port of the foot valve is connected to the hydraulic control port of the main valve. The first working oil port of the main valve is connected to the first working oil port of the auxiliary component. The second working oil port of the main valve is connected to the second working oil port of the auxiliary component through a switching valve. When the switching valve is in the first working position, the second working oil port of the auxiliary component is connected to the second working oil port of the main valve. When the switching valve is in the second working position, the second working oil port of the auxiliary component is connected to the oil tank through a filter and a radiator.

[0007] Preferably, the main valve includes a three-position four-way hydraulic directional valve, the oil inlet of which is connected to the oil outlet of the pump unit, and the oil return port of which is connected to the oil tank.

[0008] Preferably, the pipeline between the first working port of the three-position four-way hydraulic directional valve and the first working port of the auxiliary component is connected to the oil tank through a first overflow valve, and the pipeline between the second working port of the three-position four-way hydraulic directional valve and the switching valve is connected to the oil tank through a second overflow valve.

[0009] Preferably, the return port of the foot valve is connected to the oil tank; when the foot pedal is released, the working port of the foot valve is connected to the return port of the foot valve; when the foot pedal is depressed, the working port of the foot valve is connected to the inlet port of the foot valve.

[0010] Preferably, the working oil port of the foot pedal valve is connected to the hydraulic control port of the foot pedal valve via a pipeline.

[0011] Preferably, it includes two foot valves that are controlled separately, and the working ports of the two foot valves are respectively connected to the two hydraulic control ports of the three-position four-way hydraulic control directional valve.

[0012] Preferably, the switching valve is a two-position three-way manual directional valve. The first working port of the two-position three-way manual directional valve is connected to the second working port of the main valve. The second working port of the two-position three-way manual directional valve is connected to the oil tank. The third working port of the two-position three-way manual directional valve is connected to the second working port of the auxiliary component. When the two-position three-way manual directional valve is in the first working position, the third working port of the two-position three-way manual directional valve is connected to the first working port of the two-position three-way manual directional valve. When the two-position three-way manual directional valve is in the second working position, the third working port of the two-position three-way manual directional valve is connected to the second working port of the two-position three-way manual directional valve.

[0013] Preferably, the pump set includes a main pump and a gear pump connected in parallel, the main pump being connected to the main valve and the gear pump being connected to the foot valve.

[0014] Preferably, the auxiliary tool is a hydraulic shear and the switching valve is in the first working position, or the auxiliary tool is a hydraulic breaker and the switching valve is in the second working position.

[0015] This utility model also provides an excavator, including the excavator auxiliary function hydraulic system as described in any of the above.

[0016] This utility model provides a hydraulic system for excavator auxiliary functions, including an oil tank, a pump set, a main valve, a foot valve, and replaceable auxiliary components. The oil inlet of the pump set is connected to the oil tank, and the oil outlet of the pump set is connected to the oil inlet of the main valve and the oil inlet of the foot valve, respectively. The working oil port of the foot valve is connected to the hydraulic control port of the main valve. The first working oil port of the main valve is connected to the first working oil port of the auxiliary component. The second working oil port of the main valve is connected to the second working oil port of the auxiliary component through a switching valve. When the switching valve is in the first working position, the second working oil port of the auxiliary component is connected to the second working oil port of the main valve. When the switching valve is in the second working position, the second working oil port of the auxiliary component is connected to the oil tank through a filter and a radiator.

[0017] During operation, pressing or releasing the foot pedal controls the main valve to switch the oil inlet and outlet of the auxiliary components. Some auxiliary components return oil normally, with the switching valve in the first working position. For other auxiliary components, the return oil needs to be filtered and cooled, with the switching valve in the second working position. This ensures that the hydraulic oil is filtered and cooled under high load and long-term working conditions, improving hydraulic oil cleanliness, reducing equipment wear and preventing blockages, and avoiding oil leakage caused by excessively high overall oil temperature. It is suitable for different types of auxiliary components, improving applicability and reliability.

[0018] This utility model also provides an excavator including the above-mentioned excavator auxiliary function hydraulic system. Since the above-mentioned excavator auxiliary function hydraulic system has the above-mentioned technical effects, the above-mentioned excavator should also have the same technical effects, which will not be described in detail here. Attached Figure Description

[0019] Figure 1 This is a hydraulic schematic diagram of a specific embodiment of the excavator auxiliary hydraulic system provided by this utility model.

[0020] Among them, 1-pump set; 11-main pump; 12-gear pump; 2-main valve; 21-three-position four-way hydraulic directional valve; 22-first relief valve; 23-second relief valve; 4-foot valve; 5-auxiliary components; 6-manual directional valve; 7-filter; 8-radiator. Detailed Implementation

[0021] The core of this invention is to provide a hydraulic system for excavator auxiliary functions. By switching valves, different oil return methods are achieved when using different auxiliary components, thereby improving the reliability and applicability of the equipment. Another core aspect of this invention is to provide an excavator that includes the aforementioned hydraulic system for excavator auxiliary functions.

[0022] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Please refer to Figure 1 , Figure 1 This is a hydraulic schematic diagram of a specific embodiment of the excavator auxiliary hydraulic system provided by this utility model.

[0024] This utility model provides a hydraulic system for excavator auxiliary functions, including an oil tank, a pump unit 1, a main valve 2, a foot valve 4, and replaceable auxiliary components 5. The oil inlet of the pump unit 1 is connected to the oil tank, and the oil outlet of the pump unit 1 is connected to the oil inlet of the main valve 2 and the oil inlet of the foot valve 4. High-pressure oil is input to the main valve 2 and the foot valve 4 through the pump unit 1. The working port of the foot valve 4 is connected to the hydraulic control port of the main valve 2. By pressing and releasing the pedal, the high-pressure oil is controlled to enter the hydraulic control port of the main valve 2. The main valve 2 is also provided with a first working port and a second working port. The first working port of the main valve 2 is connected to the first working port of the auxiliary component 5. The second working port of the main valve 2 is connected to the second working port of the auxiliary component 5 through a switching valve. When the switching valve is in the first working position, the second working port of the auxiliary component 5 is connected to the second working port of the main valve 2. When the switching valve is in the second working position, the second working port of the auxiliary component 5 is connected to the oil tank through the filter 7 and the radiator 8.

[0025] During operation, by pressing or releasing the foot pedal of the foot valve 4, the main valve 2 is controlled to switch the oil inlet and outlet of the auxiliary component 5. Some auxiliary components 5 return oil normally, and the switching valve is in the first working position. The oil return of other auxiliary components 5 needs to be filtered and cooled, and the switching valve is in the second working position. This ensures that the hydraulic oil is filtered and cooled under high load and long-term working conditions, improving the cleanliness of the hydraulic oil, reducing equipment wear and preventing blockages, and avoiding oil leakage caused by high overall oil temperature. It is applicable to different types of auxiliary components 5, improving applicability and reliability.

[0026] Specifically, the main valve 2 includes a three-position four-way hydraulically controlled directional valve 21, which has an inlet, an outlet, a first working port, and a second working port. The two ends of the three-position four-way hydraulically controlled directional valve 21 are respectively provided with a first hydraulic control port and a second hydraulic control port. The inlet of the three-position four-way hydraulically controlled directional valve 21 is connected to the outlet of the pump unit 1, the return port of the three-position four-way hydraulically controlled directional valve 21 is connected to the oil tank, the first working port of the three-position four-way hydraulically controlled directional valve 21 is connected to the first working port of the auxiliary component 5, and the second working port of the three-position four-way hydraulically controlled directional valve 21 is connected to the switching valve.

[0027] To improve system safety, the pipeline between the first working port of the three-position four-way hydraulic directional valve 21 and the first working port of the auxiliary component 5 is connected to the oil tank via a first relief valve 22, and the pipeline between the second working port of the three-position four-way hydraulic directional valve 21 and the switching valve is connected to the oil tank via a second relief valve 23. When the output pressure is too high, the hydraulic oil in the pipeline is discharged back to the oil tank through the corresponding relief valve.

[0028] The foot valve 4 has an oil inlet, an oil return port, and a hydraulic control port. The oil return port of the foot valve 4 is connected to the oil tank. When the foot pedal of the foot valve 4 is released, the working oil port of the foot valve 4 is connected to the oil return port of the foot valve 4, causing the hydraulic control port of the three-position four-way hydraulic control directional valve 21 to depressurize and be in a low-pressure state. When the foot pedal of the foot valve 4 is depressed, the working oil port of the foot valve 4 is connected to the oil inlet of the foot valve 4, causing the hydraulic control port of the three-position four-way hydraulic control directional valve 21 to be pressurized and be in a high-pressure state.

[0029] Furthermore, the working oil port of the foot pedal valve 4 is connected to the hydraulic control port of the foot pedal valve 4 through a pipeline. When the pedal is pressed, the high-pressure oil enters the hydraulic control port and also flows to the foot pedal valve 4, generating a thrust that resets the foot pedal valve 4, so that the pedal can quickly reset when it is released.

[0030] Two foot valves 4 can be set to be controlled separately, and the working oil ports of the two foot valves 4 are respectively connected to the two hydraulic ports of the three-position four-way hydraulic control directional valve 21.

[0031] In the excavator auxiliary hydraulic system provided in the specific embodiment of this utility model, the switching valve is characterized in that the switching valve is specifically a two-position three-way manual directional valve 6. The first working port of the two-position three-way manual directional valve 6 is connected to the second working port of the main valve 2. The second working port of the two-position three-way manual directional valve 6 is connected to the oil tank. The third working port of the two-position three-way manual directional valve 6 is connected to the second working port of the auxiliary component 5. When the two-position three-way manual directional valve 6 is in the first working position, the third working port of the two-position three-way manual directional valve 6 is connected to the first working port of the two-position three-way manual directional valve 6. When the two-position three-way manual directional valve 6 is in the second working position, the third working port of the two-position three-way manual directional valve 6 is connected to the second working port of the two-position three-way manual directional valve 6.

[0032] Pump set 1 includes a main pump 11 and a gear pump 12 connected in parallel. The main pump 11 is connected to the main valve 2 to provide high-pressure oil for system operation, and the gear pump 12 is connected to the foot valve 4 to provide control oil for system control.

[0033] Based on the excavator auxiliary hydraulic system provided in the above specific embodiments, the auxiliary component 5 is a hydraulic shear with the switching valve in the first working position, or the auxiliary component 5 is a breaker with the switching valve in the second working position.

[0034] When the excavator uses the hydraulic shear auxiliary function, the pilot pressure provided by the gear pump 12, when the foot valve 4 is operated, flows into the hydraulic control port of the three-position four-way hydraulic control directional valve 21 through the foot valve 4, thereby pushing its valve core to slide. The main oil circuit provided by the main pump 11 enters the hydraulic shear element through the three-position four-way hydraulic control directional valve 21 and the manual directional valve 6. The manual directional valve 6 is in the first working position, realizing the bidirectional oil inlet and outlet of the hydraulic shear, thus enabling the hydraulic shear to work normally.

[0035] When the excavator uses the hydraulic breaker accessory function, the first step is to manually control the manual directional valve 6 to switch it to the second working position. The hydraulic return oil flows back to the oil tank through the filter 7 and radiator 8. Then, operate the foot valve 4. The pilot pressure provided by the gear pump 12 flows into the first hydraulic control port through the foot valve 4 to push the valve core of the three-position four-way hydraulic directional valve 21 to slide to the left. The main oil circuit provided by the main pump 11 enters the hydraulic breaker's oil inlet end through the first working oil port of the three-position four-way hydraulic directional valve 21. The hydraulic breaker's return oil returns to the oil tank through the manual directional valve 6, the filter 7, and the radiator 8, thus filtering and cooling the hydraulic fluid and enabling the hydraulic breaker to work normally.

[0036] The type and connection method of each valve can be adjusted according to the situation, or different auxiliary components 5 can be adjusted, all of which are within the protection scope of this utility model.

[0037] In addition to the aforementioned hydraulic system for excavator auxiliary functions, this utility model also provides an excavator that includes the aforementioned hydraulic system for excavator auxiliary functions. For the structure of other parts of the excavator, please refer to the prior art, which will not be repeated here.

[0038] The excavator auxiliary hydraulic system and excavator provided by this utility model have been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A hydraulic system for excavator auxiliary functions, characterized in that, The system includes an oil tank, a pump assembly (1), a main valve (2), a foot valve (4), and replaceable auxiliary components (5). The oil inlet of the pump assembly (1) is connected to the oil tank. The oil outlet of the pump assembly (1) is connected to the oil inlet of the main valve (2) and the oil inlet of the foot valve (4). The working port of the foot valve (4) is connected to the hydraulic control port of the main valve (2). The first working port of the main valve (2) is connected to the first working port of the auxiliary component (5). The second working port of the main valve (2) is connected to the second working port of the auxiliary component (5) through a switching valve. When the switching valve is in the first working position, the second working port of the auxiliary component (5) is connected to the second working port of the main valve (2). When the switching valve is in the second working position, the second working port of the auxiliary component (5) is connected to the oil tank through a filter (7) and a radiator (8).

2. The hydraulic system for excavator auxiliary functions according to claim 1, characterized in that, The main valve (2) includes a three-position four-way hydraulic control directional valve (21). The oil inlet of the three-position four-way hydraulic control directional valve (21) is connected to the oil outlet of the pump group (1), and the oil return port of the three-position four-way hydraulic control directional valve (21) is connected to the oil tank.

3. The hydraulic system for excavator auxiliary functions according to claim 2, characterized in that, The pipeline between the first working port of the three-position four-way hydraulic directional valve (21) and the first working port of the auxiliary component (5) is connected to the oil tank through the first overflow valve (22), and the pipeline between the second working port of the three-position four-way hydraulic directional valve (21) and the switching valve is connected to the oil tank through the second overflow valve (23).

4. The hydraulic system for excavator auxiliary functions according to claim 3, characterized in that, The return port of the foot valve (4) is connected to the oil tank. When the foot pedal of the foot valve (4) is released, the working port of the foot valve (4) is connected to the return port of the foot valve (4). When the foot pedal of the foot valve (4) is pressed down, the working port of the foot valve (4) is connected to the inlet port of the foot valve (4).

5. The hydraulic system for excavator auxiliary functions according to claim 4, characterized in that, The working oil port of the foot pedal valve (4) is connected to the hydraulic control port of the foot pedal valve (4) through a pipeline.

6. The hydraulic system for excavator auxiliary functions according to claim 5, characterized in that, It includes two foot valves (4) that are controlled separately, and the working ports of the two foot valves (4) are respectively connected to the two hydraulic ports of the three-position four-way hydraulic control directional valve (21).

7. The hydraulic system for excavator auxiliary functions according to claim 1, characterized in that, The switching valve is specifically a two-position three-way manual directional valve (6). The first working port of the two-position three-way manual directional valve (6) is connected to the second working port of the main valve (2). The second working port of the two-position three-way manual directional valve (6) is connected to the oil tank. The third working port of the two-position three-way manual directional valve (6) is connected to the second working port of the auxiliary component (5). When the two-position three-way manual directional valve (6) is in the first working position, the third working port of the two-position three-way manual directional valve (6) is connected to the first working port of the two-position three-way manual directional valve (6). When the two-position three-way manual directional valve (6) is in the second working position, the third working port of the two-position three-way manual directional valve (6) is connected to the second working port of the two-position three-way manual directional valve (6).

8. The hydraulic system for excavator auxiliary functions according to claim 1, characterized in that, The pump set (1) includes a main pump (11) and a gear pump (12) connected in parallel. The main pump (11) is connected to the main valve (2), and the gear pump (12) is connected to the foot valve (4).

9. The hydraulic system for excavator auxiliary functions according to any one of claims 1 to 8, characterized in that, The auxiliary component (5) is a hydraulic shear, and the switching valve is in the first working position; or the auxiliary component (5) is a hydraulic breaker, and the switching valve is in the second working position.

10. An excavator, characterized in that, Includes the excavator auxiliary function hydraulic system as described in any one of claims 1 to 9.

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