Pilot buffer device of excavator hydraulic motor

Abstract

The invention discloses a pilot buffer device of an excavator hydraulic motor, which comprises a hydraulic motor, a three-position six-way hydraulic changeover valve, an operation handle, a first control valve, a second control valve and a pilot buffer valve, wherein the pilot buffer valve comprises a first hydraulic control one-way valve and a second hydraulic control one-way valve, a first throttling valve and a second throttling valve; the first hydraulic control one-way valve and the second hydraulic control one-way valve are respectively connected with the first throttling valve and the second throttling valve in parallel, and hydraulic ends of the first hydraulic control one-way valve and the second hydraulic control one-way valve are interlocked. In the invention, a multi-valve combined pilot buffer valve with a compact structure is additionally provided, when the operation handle returns to a neutral position, returned oil at one end of a valve plug of the three-position six-way hydraulic changeover valve is subjected to damping action, the moving speed of the valve plug is reduced, the speed of the hydraulic motor is slowly reduced, therefore, impact and vibration to a hydraulic system when the hydraulic motor is suddenly stopped are avoided, the reliability of the excavator hydraulic system is improved, the service life of hydraulic elements is prolonged, and an excavator is convenient and accurate in throwing soil.

Description

technical field [0001] The invention relates to a working device of an excavator, in particular to a buffer device when the excavator turns and stops, and belongs to the technical field of engineering machinery. Background technique [0002] Excavators are widely used in civil engineering, hydraulic power, electric power, road traffic, mines, ports, and national defense projects. When the excavator is working, the boom cylinder, arm cylinder and bucket cylinder are coordinated with each other to complete excavation, lifting, and loading. , leveling, bulldozing, impact crushing and other different construction operations. During excavation, the bucket fetches soil first, then the hydraulic motor drives the main body of the excavator to drive the boom and stick to rotate to a predetermined position, and the bucket cylinder drives the bucket to throw soil. The existing excavator hydraulic motor rotation device uses a three-position six-way hydraulic reversing valve to directly...

AI Technical Summary

Problems solved by technology

The existing excavator hydraulic motor rotation device uses a three-position six-way hydraulic reversing valve to directly control the start, rotation and stop of the hydraulic motor. One end of the spool of the three-position six-way hydraulic reversing valve enters oil, pushing the spool to the middle position quickly. Since the oil ports of the valve body are all closed at this time, the hydraulic motor stops suddenly, and the high-pressure oil produces a water hammer impact effect on the hydraulic system. The oil pipe produces strong vibration, which increases the probability of failure of the hydraulic system and also affects the throwing of soil by the bucket

Images