Jiangsu University

Zhan Zhao

Zhong Tang

Jing Zhou

Jianjun Yin

Fang Qin

Yue Zhou

Hedong Huang

Chunjie Tian

A system includes a hollow shaft, a drum, an absolute encoder, a driving mechanism, a conveyor belt, a photoelectric sensor, and a controller. A structural optimization design method of the drum is provided on the basis of theoretical calculation of a seeding track of the drum-type seed-metering device, a theoretical model of a conveying position of a tray and a seed-metering angle is built with the aim of continuously sowing grains to the center of each hole, the conveying position of the tray and a rotating position of suction holes on the drum are monitored in real time on a seedling raising line, and a difference value between the actual position of the suction holes and the theoretical seed-metering angle and a change rate of the difference value are calculated and serve as input parameters to design a fuzzy controller of the rotation speed of the drum.

System and method for controlling continuous hole seeding of air-suction drum-type seed-metering device

The present invention provides a three-degree-of-freedom hybrid vibratory screening mechanism, a control method thereof, and a harvester. The three-degree-of-freedom hybrid vibratory screening mechanism comprises a frame, a vibrating screen, a first driving mechanism, a second driving mechanism, sensors and a controller; parallel drive of hydraulic motors are used for achieving two-degree-of-freedom rotational adjustment of the horizontal attitude angle and inclination angle of the screen surface of the vibrating screen, and the first driving mechanism drives the vibrating screen to reciprocate in one degree of freedom, so as to realize three-degree-of-freedom vibration adjustment of the screen surface; a vibration parameter control model is established by means of theoretical analysis in combination with experiment. In the operating process, the sensors installed at the tail part of the vibrating screen monitor the loss rate and distribution of the grains in real time, and the horizontal attitude angle of the screen surface, inclination angle of the screen surface and vibration frequency are self-adaptively optimized and adjusted to promote uniform and discrete distribution of the material on the screen surface, so that the screening efficiency of the material under a condition of non-uniform material feeding is effectively improved and the loss rate of the grains is decreased.

Three-degree-of-freedom hybrid vibratory screening mechanism, control method thereof, and harvester

A self-adaptive control system comprises a feeding device, a rotary coder, a displacement sensor, a hydraulic regulation system and a controller, wherein, the input end of the controller is electrically connected with the rotary coder, the displacement sensor, a first oil pressure sensor and a second oil pressure sensor respectively, and the output end of the controller is electrically connected with a solenoid directional valve via an interlocking controller; the controller takes the bearing force of piston rods and the rotation speed and the rotation speed change rate of a feeding knife roller as input variables and takes the positions of the piston rods as an output variable, to establish a fuzzy control model of the feeding mouth opening of the feeding device, the extension and retraction of the piston rods in a left oil cylinder and a right oil cylinder under hydraulic driving are regulated actively by controlling a three-position four-way solenoid directional valve, and thereby self-adaptive control of the feeding mouth opening is achieved.

Self-adaptive control system for feed opening degree of round baler, and control method therefor

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Jiangsu, China

Zhan Zhao