Design and Test of Spray Boom Height Control System for 3WSH-500 Boom Sprayer
Aiming at the problem of the fluctuation of the boom height of the self-propelled high-clearance sprayer caused by the fluctuation of the ground,this paper taked Yongjia 3WSH-500 high-clearance sprayer as the test plat-form,used the electric push rod as the boom height adjustment drive component,and adopted the hysteresis control princi-ple.A boom height control system based on ultrasonic detection was designed.Firstly,the calibration test of the feedback current signal of the ultrasonic sensor and the detection curve of the boom height under three kinds of pavements(cement pavement,field uncultivated pavement and field plowing pavement)was carried out to obtain the boom height monitoring curves of three kinds of pavements.Secondly,the static test of boom height adjustment was carried out.By changing the boom height,the response curve of boom height adjustment under static adjustment was obtained,and the static optimal hysteresis value was determined to be 10 mm.The performance test and performance control test of the sprayer speed on the height adjustment of the boom under three kinds of road surfaces were carried out.According to the vibration range when the boom height tends to be stable,the dynamic optimal hysteresis value was determined to be 50 mm,and the boom height was set to be 1 000 mm.When the speed was 2.5 km/h,5.0 km/h,6.0 km/h and 8.0 km/h,the test results showed that the speed had little effect on the control performance of the system boom height,while the ground fluctuation had a significant effect on the stability of the system boom height control.The dynamic performance control test was used as the control group.The control qualification rate of uncultivated pavement in the field increased from 83%-95%to 93%-97%.In the field ploughing pavement with large terrain fluctuation,the control qualification rate of boom height increased from 2%-16%to 72%-87%.This study can provide technical reference for improving the performance of boom height control.
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