Oil cylinder buffering pressure control method and system and excavator

Abstract

The invention provides an oil cylinder buffering pressure control method and system and an excavator, and relates to the technical field of excavators. The oil cylinder buffering pressure control method comprises the steps that a buffering pressure value provided by a buffering device located inside an oil cylinder is acquired; the buffering pressure value obtained through detection is compared with a preset pressure value; and when the buffering pressure value obtained through detection is larger than the preset pressure value, the flow of hydraulic oil which is supplied to the oil cylinder and used for movement of a piston is reduced. When the piston of the oil cylinder moves towards the end with the buffering device, the buffering pressure provided by the buffering device is increased along with the process that the piston gets close to the buffering device, and when the buffering pressure value obtained through detection is larger than the preset value, the flow of the hydraulic oil which is inputted into the oil cylinder is reduced. The flow is reduced, the movement speed of the oil cylinder is reduced, and the corresponding buffering pressure is reduced. By means of the oil cylinder buffering pressure control method, the buffering device can be prevented from causing the huge impact on the piston of the oil cylinder, and the service life of the oil cylinder is prolonged.

Description

technical field [0001] The invention relates to the technical field of excavators, in particular to an oil cylinder buffer pressure control method, system and excavator. Background technique [0002] Excavators include boom cylinders, bucket cylinders and stick cylinders. Generally, there are buffer devices in the cylinders. When hydraulic excavator cylinders drive working parts with large mass and fast movement speed, such as buckets and breakers, The buffer device can eliminate the mechanical impact between the piston and the cylinder head caused by the inertial force of the moving parts and the hydraulic pressure, and avoid failures such as damage to the cylinder head. The greater the cushioning pressure, the better the cushioning effect of the cylinder. However, if the buffer pressure is too high, the piston of the oil cylinder will be subjected to a large impact force, which will easily cause deformation of the piston, failure of the piston seal and other failures. ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an oil cylinder buffer pressure control method, system and excavator to alleviate the technical problems of the excessive buffer pressure provided by the buffer device after the excavator replaces the working parts, causing piston deformation, piston seal failure and other technical problems

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