Quick-change device control valve group, hydraulic system and excavator
A device control and hydraulic system technology, which is applied in the testing of fluid pressure actuation systems, fluid pressure actuation devices, and mechanical equipment. Fast and efficient results that meet diverse functional requirements
Pending Publication Date: 2021-12-28
中联重科土方机械有限公司
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Problems solved by technology
Therefore, the hydraulic system of the existing quick change device is relatively simple, and there are defects such as inconvenient adjustment of the pressure value, low pressure and no pressure supplement function.
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[0047] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.
[0048] The quick change device control valve group and the excavator according to the present invention will be described below with reference to the accompanying drawings.
[0049] Aiming at the shortcomings of the hydraulic system of the quick change device in the prior art, the invention discloses a novel control valve group of the quick change device. see figure 1 , figure 2 In a specific embodiment shown, the quick change device control valve group 1 includes:
[0050] Valve body 1-1, valve body 1-1 is provided with valve group oil inlet P, valve group oil return port T, and rod chambers and rodless chambers for external connection to the hydraulic cyli...
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The invention discloses a quick-change device control valve group, a hydraulic system and an excavator. The quick-change device control valve group comprises a valve body, a main reversing valve, a first pressure sensor and an adjustable pressure reducing valve, one side of the main reversing valve is provided with a reversing valve oil inlet connected with a valve group oil inlet and a reversing valve oil return port connected with a valve group oil return port, and a first reversing working oil port connected with a rodless cavity connecting oil port and a second reversing working oil port connected with a rod cavity connecting oil port are formed in the other side of the main reversing valve; the first pressure sensor is used for detecting the working oil pressure of the rodless cavity connecting oil port; the adjustable pressure reducing valve is arranged in an oil inlet connecting oil way between the valve group oil inlet and the reversing valve oil inlet, and the pressure of an oil outlet of the pressure reducing valve can be adjusted. The pressure of a hydraulic oil cylinder of the quick-change device can be manually or automatically matched according to different accessories, the pressure of the hydraulic oil cylinder of the quick-change device can achieve the pressure supplementing function along with load increase, and meanwhile the double functions of pressure reduction and overflow are achieved.
Description
technical field [0001] The invention relates to the technical field of hydraulic control of engineering machinery, in particular to an excavator, its hydraulic system, and a quick change device control valve group. Background technique [0002] There are many types of excavator operations, such as excavation, crushing, hydraulic shears, grabs, etc. These operations will use different working device attachments (i.e. attachments), and they are often replaced according to different working conditions. Among them, if the manual disassembly and assembly method is adopted, it not only increases the labor intensity, but also takes time and effort, and the work efficiency is extremely low. Therefore, construction machines such as excavators are mostly equipped with quick-change devices for attachments, so as to realize rapid replacement of attachments of working devices. [0003] Taking excavators as an example, the hydraulic system of common quick-change devices can only meet som...
Claims
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Login to View More IPC IPC(8): F15B13/04F15B11/08F15B19/00
CPCF15B13/0401F15B11/08F15B19/00
Inventor 李文举梅广红宫永辉杨正维张磊
Owner 中联重科土方机械有限公司