An Excavator Swing Energy Saving System

Abstract

The invention discloses a rotary energy saving system of an excavator. When the excavator rotates to be started, corresponding flow is supplied according to a demand of a rotary motor, so that overflow loss of the system is reduced. A flow control valve is arranged between an overload buffering valve and an oil tank. In a process of accelerating rotary starting, the flow control valve works in a throttling mode; flow, namely overflow of the system, of the flow control valve is calculated according to pressure at an oil inlet of the flow control valve, and the discharge capacity of a hydraulic pump is adjusted according to the overflow of the system; when the overflow is increased, the discharge capacity of the hydraulic pump is reduced, so that most of the pump output flow is absorbed by the rotary motor, and energy loss is reduced; when the overflow is reduced, the discharge cavity of the hydraulic pump is improved, so that the requirement of the rotary motor can be met; moreover, the inlet pressure of the rotary motor is always kept at an overflow pressure value, and the rotary torque is increased, so that the rotary acceleration performance is guaranteed; and in a process of rotary deceleration brake, the flow control valve works in a direct through mode, so that oil can be normally filled into the rotary motor.

Description

technical field [0001] The invention relates to the technical field of engineering machinery energy saving, in particular to an excavator rotary energy saving system. Background technique [0002] The slewing system occupies a very important position in the working process of hydraulic excavators. In each working cycle of the excavator, two rotations are required: full bucket rotation and empty bucket rotation, and each rotation includes at least two processes of starting acceleration and deceleration braking. Due to the large mass and large inertia of the body of the excavator, the acceleration is very slow. In the initial stage of start-up, the rotation speed of the swing motor is low, and the flow demand is small. The output flow of the hydraulic pump is much greater than the flow required by the swing motor. The excess flow overflows through the overload buffer valve, resulting in a large amount of energy loss. This part of energy loss will not only increase fuel consu...

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Problems solved by technology

But this needs to change the hydraulic system mechanism, which makes the system more complicated and increases the cost of the whole machine

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