A load holding valve for oil cylinder of engineering machinery

Abstract

The invention relates to a load holding valve for construction machinery oil cylinder, which comprises a valve sleeve, which is provided with a first oil port and a second oil port; a screw sleeve, which is threaded on the upper end of the valve sleeve; a valve seat, which is fixedly connected to In the valve sleeve; the one-way valve core is slid in the valve sleeve, and has an inner cone surface to form a line seal with the lower end surface of the valve seat; the adjustment rod is threaded on the screw sleeve; the control spool is slid in the valve seat Inside; control spring. The load holding valve for engineering machinery oil cylinder of the present invention has the advantages of simple structure, compact volume, easy integration and long service life.

Description

technical field [0001] The invention belongs to the technical field of engineering machinery, and in particular relates to a load holding valve used for an oil cylinder of an engineering machinery. Background technique [0002] In the field of construction machinery and construction machinery, many equipment such as excavators, loaders, and two-headed excavators rely on oil cylinders to bear loads, so oil cylinders are required to have a load holding function. However, the action control of the oil cylinder mainly relies on the valve, and the valve usually has the problem of oil leakage during work. In this way, when the weight of the oil cylinder is heavier, the leakage of the oil cylinder will increase, which will lead to its working process. The load holding performance will be worse. [0003] In order to solve the impact on the load holding performance of the oil cylinder due to the valve leakage problem, in the Chinese patent with the application number 201510193345.8 ...

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Problems solved by technology

[0004] However, the load holding valves disclosed in the above two patents have the following technical problems: 1. They are all plate valve structures, so they need to be fixedly installed on the bracket with screws during actual use, and then pass through pipelines, oil cylinders and multiple valves. 2. When controlling the lifting and lowering of the oil cylinder, the load holding valves disclosed in the above two patents are both It is realized by controlling the repeated opening and closing actions of a spool, and the frequent operation of construction machinery will increase the number of opening and closing of the corresponding spool, thereby aggravating the wear of the spool, resulting in poor sealing and leakage , resulting in shortened service life of the entire valve

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