Automatic Position Control of Cutter Bar for Tea-Plucking Machine by Means of Electro-Hydraulic Control. (Part 2)

Experiment and Discussion on On-Off Control System

Abstract

1. The experimental apparatus for the laboratory test was constructed and the experiment using this model apparatus was carried out in order to investigate some problems which might be encountered when the electro-hydraulic On-Off control system is employed for the automatic position control of cutter bar for tea-plucking machine.
2. The subject of this experiment was to investigate the effect of vertical movement velocity of the cutter bar, operation interval of the limit switch and setting time of the relay with delay time on the tracking performance of the cutter bar, the width of dead zone of the sensing plate, the period and amplitude of hunting and its occurrence condition, and those mutual relationships were expressed by equations.
3. For improving the accuracy of operation and eliminating a trouble with the On-Off automatic control system, some problems in design and treatment of the apparatus which should be considered were found from the results and discussion of this experiment.