A hydraulic system for controlling the boom suspension of a high-ground-clearance sprayer

Abstract

The invention relates to a high-clearance sprayer spraying rod suspending frame control hydraulic system. According to the system, vertical active and passive suspending frames control a hydraulic unit, and the posture of a spraying rod can be controlled to compensate for the deficiency of a passive suspending frame, so the spraying rod can swing along with a low-frequency trolley body better to ensure that the gap between the spraying rod and the ground or crops is constant; through a dynamic pressure feedback unit, under the circumstance of not changing the steady-state characteristic of thesystem, through the dynamic characteristic that loading dampness in direct proportion to loading pressure changes is generated to improve the hydraulic system, pressure impact and loading pressure vibration of a filtering system are effectively absorbed, the vibration of the spraying rod is reduced, and the pesticide spraying quality is improved; through a loading feedback loop, according to actual loading changes in the work process of the system, the flow of hydraulic oil output to an executing element is adjusted, the control accuracy of the system is improved, and the energy loss of the system is reduced; through an anti-collision device, the problems that in the operation process of the spraying rod in the field, due to the fact that the spraying rod collides with barriers, the spraying rod is damaged and fractures are effectively solved.

Description

technical field [0001] The invention relates to a hydraulic system, in particular to a high-ground-clearance sprayer spray-boom control hydraulic system capable of switching active and passive suspensions, spray-boom height adjustment, folding and anti-collision functions. Background technique [0002] The high-gap boom sprayer is a large-scale high-end plant protection agricultural machine. It has the characteristics of wide application range, high working efficiency, uniform spraying, reasonable dosage application, and low spraying cost. It has been widely used in field operations. With the improvement of people's requirements for the operating speed, operating accuracy and economical and environmental protection of large sprayers, higher requirements are put forward for the response speed, working stability and energy saving of the hydraulic system of the boom suspension. However, the dynamics of the hydraulic system Performance improvement and system stability are often ...

AI Technical Summary

Problems solved by technology

With the improvement of people's requirements for the operating speed, operating accuracy and economical and environmental protection of large sprayers, higher requirements are put forward for the response speed, working stability and energy saving of the hydraulic system of the boom suspension. However, the dynamics of the hydraulic system Performance improvement and system stability are often contradictory, especially in the face of flexible booms with large spans, low stiffness, and weak damping. It is difficult for an underdamped boom suspension hydraulic system to effectively absorb pressure shocks and filter out The system load pressure oscillates, which makes it difficult for the residual vibration after the attitude adjustment of the flexible spray boom to attenuate itself, which not only reduces the stability and spraying accuracy of the spray boom attitude adjustment, but also shortens the service life of the spray boom

Most of the existing spray boom suspension control hydraulic systems are passive balance adjustment systems, which cannot actively reduce the impact of vehicle body swing and terrain changes on spray quality, which affects the operation quality and spraying efficiency of high ground clearance sprayers.

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