Excavator swing hydraulic control system

Abstract

The invention relates to a hydraulic control system for rotation of an excavator in order to solve the problem that energy overflow loss exists when an existing hydraulic excavator is started in a rotation mode. The hydraulic control system for rotation of the excavator comprises a rotary motor assembly, a main pump, a first three-position four-way solenoid directional valve, a main pump proportional electromagnetic valve, a main pump pressure sensor, a guide handle and a controller. A pump inlet of the main pump is connected with a port P of the first three-position four-way solenoid directional valve. A port A and a port B of the first three-position four-way solenoid directional valve are connected with a port A and a port B of the rotary motor assembly correspondingly. The control output end of the guide handle and the main pump pressure sensor are connected with the input end of the controller. The electromagnet control input end of the first three-position four-way solenoid directional valve is connected with the output end of the controller. The hydraulic control system for rotation of the excavator has the advantages that a small number of components are additionally arranged, the technology is relatively mature, the cost is low, an electronic control system and the hydraulic control system are combined, control is flexible and reliable, the energy utilization rate is high, the start overflow loss is reduced, and the energy saving effect is obvious.

Description

technical field [0001] The invention relates to a hydraulic control system, in particular to a hydraulic control system for excavator slewing. Background technique [0002] The most common working condition of hydraulic excavators is excavation and loading, and each excavation cycle will go through two slewing start and slewing braking processes. In the most common excavator slewing system, when slewing brakes, the overflow of the relief valve at the working oil port of the slewing motor generates a reverse torque, which makes the slewing decelerate until it stops. During the braking process, the hydraulic oil overflows through the relief valve, which generates a large amount of heat, that is, the kinetic energy of the rotation is converted into the heat energy of the hydraulic oil and consumed. In the process of slewing start-up, the slewing torque required in the initial stage of starting is very large, and the slewing relief valve will also reach the overflow pressure. W...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an excavator rotary hydraulic control system that can recover energy and reduce energy overflow loss during rotary startup in view of the existing hydraulic excavator's problem of energy overflow loss during rotary startup

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