Design Of Control System Of Intelligentized Tobacco Topping Machine Based On ATmega128

Tobacco topping can increase tobacco production, improve the quality of tobacco. After decapitation, axillary buds will consume large amounts of nutrients, which prevent growth of leaves and the accumulation of material. So while topping tobacco, we must control the growth of axillary bud. Intelligentized tobacco topping machine was developed which can simultaneously topping tobacco and control suckers. The machine not only improved the backward situation of manual topping and separate operation of mechanical tobacco topping and sucker controlling, but also avoided the situation of"indiscriminate"topping. Intelligentized tobacco topping machine was to to accomplish tobacco intelligent topping and suckercide precision spraying. Control system was used to control intelligent tobacco topping system and suckercide spraying system to ensure the machine normal operating. The main contents are as follows:(1) Determination of the control system program. According to the design requirements and the actual situation of tobacco production, a program was determited that not only satisfied design requirements but also can be used in the actual production.(2) Design of intelligent tobacco topping system. Intelligent tobacco topping system was used to accomplish tobacco height automatic identification and tool carriage automatic lifting, which achieved intelligent tobacco topping. According to the working principle, we chosed the tobacco height identification device was fifteen E3F-DS30C4 infrared photoelectric sensors. We chosed the execute component was an 86BYGH450C-02 step motor. Fifteen infrared photoelectric sensors of the system were used to profile of tobacco height and deliver measure information to the microcontroller system. Microcontroller unit was used for controlling rotation direction and rotation angle of stepping motor for lifting or dipping the tool carriage, so the tobaccowere topped at the appropriate height.(3) Design of suckercide spraying system. Suckercide spraying system was used to accomplish detection of tobacco stem after topping and suckercide precision spraying. According to the working principle, we chosed the tobacco stem detecting element was an E3F-DS30C4 infrared photoelectric sensor. We chosed the suckercide spraying execute component was a 3WE5A6.0F/AG24NZ5L solenoid valve. Suckercide spraying device was placed at the back of topping device. After topping, tobacco passed through by the front of infrared photoelectric sensor. Microcontroller unit controled solenoid valve spray suckercide solution to tobacco for a while.(4) Design of keyboard and LCD display module. Keyboard and LCD display module was used to complete human-machine communication. The operator can not only use the keyboard to complete the required work but also can observe control system working status through the LCD display module at any time.The results of reliability tests indicated that:①Intelligent tobacco topping system can accurately measure the height of tobacco. The photoelectric sensors were low-cost and reliable. Effective recognition rate of sensors came to100% and measuring accuracy came to 98%. Accuracy topping rate of the system came to 93%, which satisfied the demand of operation.②The best operating condition of the solenoid valve were: the opening time is 0.125 seconds, the working pressure is 0.325 MPa～0.5 MPa. Single spraying amount of solenoid valve came to 20～25 ml, which satisfied the actual needs.