Hydraulic circuit and hydraulic control system for multifunctional accessories of excavator

Abstract

The utility model discloses an excavator multifunctional accessory hydraulic circuit and a hydraulic control system, and relates to the excavator hydraulic technical field, the excavator multifunctional accessory hydraulic circuit comprises an excavator accessory, a main valve, a one-way and two-way switching valve, an overflow valve and a hydraulic oil tank, two working oil ports of the main valve are respectively connected with the excavator accessory to form a left pipeline and a right pipeline; two port overflow valves are arranged at a working oil port of the main valve and are respectively positioned on the left pipeline and the right pipeline; a reversing overflow pipeline is arranged on the right pipeline in parallel, a reversing overflow valve is arranged on the reversing overflow pipeline, and the reversing overflow valve is connected with the hydraulic oil tank; according to the hydraulic shear, the reversing overflow pipeline is arranged, the system pressure during operation of the breaking hammer can be adjusted through the reversing overflow valve, the system pressure during operation of the hydraulic shear is adjusted in cooperation with the two port overflow valves, and rapid switching can be achieved when different excavator accessories are switched according to construction requirements; and the working pressure does not need to be readjusted every time, so that the field working efficiency is greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to excavator hydraulic technology field, concretely relates to a kind of excavator multifunctional accessory hydraulic circuit and hydraulic control system. BACKGROUND

[0002] At present, with the demand of construction site, excavator will be matched with multiple accessories to work, when used in different working conditions such as breaking, shearing, grabbing and clamping, hydraulic system needs to be installed with hydraulic lines corresponding to breaking, shearing, grabbing and clamping accessories of different accessories. But the working pressure of different accessories is not the same, when replacing the accessory, the port relief valve of main valve also needs to be adjusted to meet the needs of different accessories.

[0003] At present, the multifunctional accessory of 13-ton excavator mainly includes one-way breaking hammer and two-way hydraulic shear, and ordinary two-way pipeline is actually used. On the one hand, when the two accessories are switched, it cannot be quickly switched, because the working pressure of the two accessories is different, pressure adjustment is needed when switching accessories, and the working efficiency is low, time-consuming and laborious. On the other hand, when using breaking hammer, breaking oil returns to main valve directly, because the working condition of breaking hammer is relatively harsh, hydraulic oil is easy to be contaminated, causing valve jamming failure, affecting the reliability of the whole machine. CONTENT OF THE UTILITY MODEL

[0004] In view of the deficiencies existing in the prior art, the utility model provides a kind of excavator multifunctional accessory hydraulic circuit and hydraulic control system, can realize the quick switching of breaking hammer and hydraulic shear mode, to meet the needs of different working pressure, and can guarantee the cleanliness under breaking condition.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A kind of excavator multifunctional accessory hydraulic circuit, including excavator accessory, main valve, single-double directional switch valve, reversing relief valve and hydraulic oil tank, two working oil ports of the main valve are connected with the oil port T and the oil port P of excavator accessory respectively, to form left pipeline and right pipeline;Two port relief valves are arranged at the two working oil ports of the main valve, and the two port relief valves are located on the left pipeline and the right pipeline respectively;

[0007] Reversing relief pipeline is provided in parallel on the right pipeline, reversing relief valve is arranged on the reversing relief pipeline, and the reversing relief valve is connected with the hydraulic oil tank;The single-double directional switch valve is arranged in the left pipeline, for switching one-way operation mode and two-way operation mode.

[0008] As a further implementation, the single-double directional switch valve is a two-position three-way electromagnetic valve, the oil inlet and the oil outlet of the single-double directional switch valve are connected in series on the left pipeline, and the oil return port is connected with the hydraulic oil tank.

[0009] As a further implementation manner, the reversing overflow pipeline is further provided with an overflow pipeline control valve, which is arranged between the reversing overflow valve and an oil port P of the excavator accessory.

[0010] As a further implementation manner, the overflow pipeline control valve is a two-position two-way electromagnetic valve.

[0011] As a further implementation manner, in the single-direction operation mode, the overflow pipeline control valve is in the left position, the oil inlet pipeline of the excavator accessory is simultaneously communicated with the reversing overflow pipeline and the main valve, and the system pressure of the breaking hammer is controlled through the reversing overflow valve.

[0012] As a further implementation manner, in the single-direction operation mode, the overflow pipeline control valve is in the left position, the oil inlet pipeline of the excavator accessory is simultaneously communicated with the reversing overflow pipeline and the main valve, and the system pressure of the breaking hammer is controlled through the reversing overflow valve.

[0013] As a further implementation manner, in the bidirectional operation mode, the overflow pipeline control valve and the single-direction bidirectional switch valve are both in the right position, the oil inlet pipeline and the oil return pipeline of the excavator accessory are both communicated with the main valve, the reversing overflow pipeline is disconnected, and the system pressure of the hydraulic shear is controlled through the port overflow valve.

[0014] As a further implementation manner, a pipeline filter is arranged between the oil outlet of the single-direction bidirectional switch valve and the hydraulic oil tank, the returned oil after breaking is filtered and reused, the cleanliness of the oil is further ensured, and the problem of oil pollution under the breaking working condition is reduced.

[0015] As a further implementation manner, the main valve adopts a three-position six-way electro-hydraulic valve to control the reversing of the oil inlet and return of the excavator accessory and ensure the switching of the oil inlet and return of the accessory.

[0016] On the other hand, the utility model provides a kind of excavator hydraulic control system, it includes a kind of excavator multifunctional accessory hydraulic circuit as described in any one of the above.

[0017] Using the above technical solution, the utility model has the following beneficial effects:

[0018] 1, the utility model sets up reversing overflow pipeline, can be adjusted to the system pressure when breaking hammer is operated by reversing overflow valve, is adjusted to the system pressure when hydraulic shear is operated by two port overflow valves, when different excavator accessories are switched according to construction demand, quick switching can be realized, without adjusting working pressure every time, greatly improve the site work efficiency.

[0019] 2, The utility model discloses a single -double -way switch valve can realize the switching of unidirectional operation mode and bidirectional operation mode can realize the quick switching of different working mode when the excavator is equipped with different function's tool, improve the operation efficiency in the complex construction conditions such as crushing, shearing, simultaneously, single -double -way switch valve adopts two -way three -way electromagnetic reversing valve, can connect hydraulic oil tank through oil return port, thereby avoiding the oil return after crushing operation and flowing back to the main valve directly to cause the fault such as the valve sticking of main valve, effectively improve the stability when excavator operation.

[0020] 3, The utility model discloses being equipped with pipeline filter between the oil return port of single -double -way switch valve and hydraulic oil tank, can filter the oil return after crushing operation, avoid the oil pollution due to the bad crushing condition and cause the pipeline failure, effectively guarantee the cleanliness of hydraulic oil. DRAWINGS

[0021] The drawings accompanying the specification of the utility model form a part of the utility model and serve to provide further understanding of the utility model, and the illustrative embodiments of the utility model and their descriptions serve to explain the utility model, and do not constitute improper limitation on the utility model.

[0022] Figure 1 It is hydraulic circuit structure schematic diagram of the utility model embodiment.

[0023] In the drawing: 1, excavator tool;2, main valve;3, single -double -way switch valve;4, hydraulic oil tank;5, pipeline filter;6, reversing overflow valve;7, overflow pipeline control valve;8, first port overflow valve;9, second port overflow valve. DETAILED DESCRIPTION

[0024] It should be noted that the following detailed description is all exemplary, and aims at providing further explanation of the utility model. Unless otherwise specified, all the technical and scientific terms used in the utility model have the same meaning as that understood by the ordinary skilled in the art to which the utility model belongs.

[0025] It should be noted that the terms used herein are only for describing the specific embodiments, and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, they indicate the presence of the features, steps, operations, devices, components and / or their combinations. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without making creative efforts are within the scope of protection of the utility model.

[0026] Embodiment one

[0027] In one typical embodiment of this application, a hydraulic circuit for a multi-functional attachment of an excavator is provided, such as... Figure 1 As shown, the device includes an excavator attachment 1, a main valve 2, a one-way switching valve 3, a reversing relief valve 6, and a hydraulic oil tank 4. The two working ports of the main valve 2 are connected to ports T and P of the excavator attachment 1, respectively, forming a left pipeline and a right pipeline. Two port relief valves are installed at the two working ports of the main valve 2, and the two port relief valves are located on the left pipeline and the right pipeline, respectively.

[0028] A reversing overflow pipeline is connected in parallel on the right pipeline, and a reversing overflow valve 6 is installed on the reversing overflow pipeline. The reversing overflow valve 6 is connected to the hydraulic oil tank 4. The one-way and two-way switching valve 3 is installed in the left pipeline and is used to switch between one-way operation mode and two-way operation mode.

[0029] Specifically, such as Figure 1 As shown, the excavator attachment 1 has two oil ports, namely oil port T and oil port P. Oil port P is directly connected to one of the working oil ports of the main valve 2. A one-way / two-way switching valve is connected in series on the pipeline between oil port T and the working oil port of the main valve 2, which can connect or disconnect the connection pipeline between oil port T and the main valve. In this embodiment, the connection pipelines between oil port T and oil port P and the main valve 2 are referred to as the left pipeline and the right pipeline, respectively. Figure 1 As shown, the left and right pipelines are respectively equipped with a first port relief valve 8 and a second port relief valve 9 at the working oil port of the main valve. The first port relief valve 8 can control the system pressure on the left pipeline when the left pipeline is connected, and the second port relief valve 9 is used to control the system pressure on the right pipeline, so that the working pressure of the pipeline can meet the operating needs of the excavator attachments.

[0030] In this embodiment, the main valve is a three-position six-way electro-hydraulic valve, which controls the switching of the oil inlet and return of the excavator attachments, effectively ensuring the stable switching of the oil inlet and return of the attachments.

[0031] In this embodiment, the bidirectional switching valve 3 is a two-position three-way solenoid valve, including an oil inlet, an oil outlet, and a return oil port. The oil inlet and oil outlet of the bidirectional switching valve 3 are connected in series on the left pipeline, and the return oil port is connected to the hydraulic oil tank 4.

[0032] Specifically, such as Figure 1 As shown, an overflow control valve 7 is also provided on the reversing overflow pipeline. The overflow control valve 7 is located between the reversing overflow valve 6 and the oil port P of the excavator attachment 1, and is used to control the opening and closing of the reversing overflow pipeline. The reversing overflow pipeline is connected in parallel with the pipeline where the main valve 2 is located. When the reversing overflow pipeline is connected, the system pressure can be adjusted by adjusting the reversing overflow valve 6 without changing the second port overflow valve 9. In this embodiment, the overflow control valve is a two-position two-way solenoid valve.

[0033] In this embodiment, as Figure 1 As shown, a pipeline filter 5 is connected in series between the oil return port of the single / dual-way switching valve 2 and the hydraulic oil tank 4, for filtering the broken oil return and reusing, which can effectively ensure the cleanliness of the working oil, avoid the problem of oil pollution under the breaking condition, and improve the stability of the hydraulic system.

[0034] Specifically, when the excavator accessory needs a one-way operation mode, for example, a breaking hammer, at this time, the overflow pipeline control valve 7 is in the left position, the oil inlet pipeline of the excavator accessory 1 is connected to the reversing overflow pipeline and the main valve 2, at this time, the system pressure of the excavator accessory during operation can be controlled through the reversing overflow valve 6; the single / dual-way switching valve 3 is in the left position, the oil return pipeline of the excavator accessory 1 is connected to the hydraulic oil tank 4, avoiding the broken oil return directly to the main valve 2, preventing the main valve from failing due to oil pollution, and improving the reliability of the overall operation process.

[0035] Specifically, when the excavator accessory needs a two-way operation mode, for example, a hydraulic shear and a wood grabber, at this time, the overflow pipeline control valve 7 and the single / dual-way switching valve 3 are both in the right position, the oil inlet pipeline and the oil return pipeline of the excavator accessory 1 are both connected to the main valve 2; at this time, the reversing overflow pipeline is blocked, and the system pressure of the excavator accessory 1 can be controlled through the first port overflow valve 8 and the second port overflow valve 9.

[0036] The working principle of the embodiment is as follows:

[0037] When the excavator accessory uses a breaking hammer, the breaking hammer mode is selected on the instrument, at this time, the reversing overflow valve and the single / dual-way switching valve are in the left position, the breaking oil inlet pressure is set through the pressure of the reversing overflow valve to control the system pressure of the breaking hammer, and the oil return pipeline is connected to the hydraulic oil tank through the single / dual-way switching valve after passing through the pipeline filter, thereby improving the cleanliness of the hydraulic system.

[0038] When the excavator accessory uses a hydraulic shear accessory, the hydraulic shear mode is selected on the instrument, at this time, the reversing overflow valve and the single / dual-way switching valve are in the right position, the oil inlet and return of the hydraulic shear are connected to the main valve, the pressure is set through the two port overflow valves on the main valve, and then the system pressure of the hydraulic shear is controlled.

[0039] The above only describes preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can be variously changed and modified. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A hydraulic circuit for a multi-functional attachment of an excavator, characterized in that, The system includes an excavator attachment, a main valve, a one-way switching valve, a reversing relief valve, and a hydraulic oil tank. The two working ports of the main valve are connected to ports T and P of the excavator attachment, respectively, forming a left pipeline and a right pipeline. Two port relief valves are installed at the two working ports of the main valve, and the two port relief valves are located on the left pipeline and the right pipeline, respectively. The one-way switching valve is a two-position three-way solenoid valve. The oil inlet and outlet of the one-way switching valve are connected in series on the left pipeline, and the oil return port is connected to the hydraulic oil tank. A reversing overflow pipeline is connected in parallel on the right pipeline, a reversing overflow valve is installed on the reversing overflow pipeline, and an overflow pipeline control valve is also installed on the reversing overflow pipeline. The reversing overflow valve is connected to the hydraulic oil tank. The one-way and two-way switching valve is installed in the left pipeline and is used to switch between one-way operation mode and two-way operation mode. When the one-way switching valve is in the left position, the return oil line of the excavator attachment is connected to the hydraulic oil tank, which prevents the return oil from breaking the machine from going directly back to the main valve, prevents the main valve from malfunctioning due to oil contamination, and improves the reliability of the overall operation. In bidirectional operation mode, both the overflow pipeline control valve and the one-way / two-way switching valve are in the right position, and the oil inlet and return pipelines of the excavator attachments are connected to the main valve; the reversing overflow pipeline is disconnected, and the system pressure of the hydraulic shear is controlled through the pipe overflow valve.

2. The hydraulic circuit for a multi-functional excavator attachment as described in claim 1, characterized in that, The overflow pipeline control valve is located between the reversing overflow valve and the oil port P of the excavator attachment.

3. The hydraulic circuit for a multi-functional excavator attachment as described in claim 2, characterized in that, The overflow pipeline control valve is a two-position two-way solenoid valve.

4. The hydraulic circuit for a multi-functional excavator attachment as described in claim 2, characterized in that, In unidirectional operation mode, the overflow pipeline control valve is in the left position, and the oil inlet pipeline of the excavator attachment is simultaneously connected to the reversing overflow pipeline and the main valve. The system pressure of the breaker is controlled by the reversing overflow valve.

5. The hydraulic circuit for a multi-functional excavator attachment as described in claim 1, characterized in that, A pipeline filter is installed between the return port of the one-way and two-way switching valve and the hydraulic oil tank.

6. The hydraulic circuit for a multi-functional excavator attachment as described in claim 1, characterized in that, The main valve is a three-position six-way electro-hydraulic valve.

7. A hydraulic control system for an excavator, characterized in that, Includes a hydraulic circuit for a multi-functional attachment for an excavator as described in any one of claims 1-6.

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