| CPC B65G 43/08 (2013.01) [B65G 47/848 (2013.01); B65G 2201/0202 (2013.01); B65G 2203/0233 (2013.01); B65G 2203/044 (2013.01); B65G 2811/095 (2013.01)] | 7 Claims |
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1. A method for controlling continuous hole seeding of an air-suction drum-type seed-metering device, comprising a system for controlling continuous hole seeding of the air-suction drum-type seed-metering device, wherein the system for controlling continuous hole seeding of the air-suction drum-type seed-metering device comprises a hollow shaft, a drum, an absolute encoder, a driving mechanism, a conveyor belt, a photoelectric sensor, and a controller;
the hollow shaft is horizontally mounted on a line frame, the drum is mounted on the hollow shaft, the drum and the hollow shaft have a common axis, and arrayed suction holes are disposed on the drum;
one end of the hollow shaft is connected to a negative pressure fan and the other end of the hollow shaft is connected to a positive pressure fan, a positive pressure end of the hollow shaft is provided with a vertical through pipe, a partition plate is mounted below the vertical through pipe, the partition plate is attached to an inner wall of the drum through a preloaded spring to form a closed positive pressure cavity, a plurality of through holes are disposed on a negative pressure end of the hollow shaft, and a negative pressure cavity is formed in the drum;
the absolute encoder is mounted on the drum and is used for measuring a rotation state of the drum, that is, a position angle of the suction holes in each row, the driving mechanism is connected to the drum, and the drum rotates about an axis of the hollow shaft;
the conveyor belt is located below the drum, and the photoelectric sensor is mounted on the conveyor belt and is used for detecting a position of a tray conveyed by the conveyor belt;
the controller is connected to the absolute encoder, the photoelectric sensor, and the driving mechanism;
the method comprises the following steps:
determining a seed-metering angle θ0 and a contact height h between the partition plate and the drum;
establishing a matching relationship between a rotation speed of the drum and a conveying speed of the tray;
determining a theoretical model of a conveying position of the tray and the seed-metering angle;
recording a time when the photoelectric sensor detects the tray according to the theoretical model of the conveying position of the tray and the seed-metering angle;
measuring, by the absolute encoder, an actual angle of the corresponding suction holes on the drum, and calculating a deviation of the seed-metering angle and a deviation change rate of the drum;
inputting the deviation of the seed-metering angle and the deviation change rate into the controller to build a fuzzy controller of the rotation speed of the drum, that is, an adjustment control model of the rotation speed of the drum;
setting, by the controller, a speed of the conveyor belt and the rotation speed of the drum according to the matching relationship between the rotation speed of the drum and the conveying speed of the tray;
collecting, by the controller, output signals from the absolute encoder and the photoelectric sensor in real time and calculating the rotation speed of the drum according to the adjustment control model of the rotation speed of the drum; and
controlling, by the controller, the driving mechanism to adjust the rotation speed of the drum, so that an actual seed-metering angle is kept within a set range.
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