| Cotton stalks are abundant in Xinjiang,and straw return to the field is an important treatment method for cotton stalks,i.e.,the stalks are crushed by mechanized means and then turned into the soil,which is convenient and fast while increasing the content of organic matter in the soil,enhancing soil microbial activity and cultivating soil fertility.In the face of the problem of increased pests and diseases in the next crop due to cotton straw return to the field,we designed a spraying and killing device before the straw crushing and return operation for the 66+10cm planting pattern of cotton fields in Xinjiang,drawing on many domestic and foreign scholars’ treatment methods and pest and disease control initiatives.Main work: A set of spraying device can be mounted on a mobile platform or mounted on the front of the tractor by means of front suspension,and for the spraying operation,the spraying effect is easily affected by external airflow,and designed a set of STM32 microcontroller as the core of the auxiliary control system,through the establishment of two-input two-output fuzzy controller,using fuzzy algorithm to achieve the spraying device in different external environmental factors,increase or decrease the output compensation to improve the effect of spraying operation,the main research content is as follows:(1)The overall structure of the spraying and killing device was designed,and the three-dimensional model of the device was designed and drawn using SolidWorks to determine the composition of each functional module and their relative positions and sizes,as well as the design and selection of the main components of the device,determining the parameters and types of nozzles,pumps,as well as sensors,electric control valves,servos and other components to meet the needs of actual operation.(2)In order to investigate the change of mechanical properties of cotton straw after spraying,i.e.the effect of spraying on the mechanical properties of cotton straw,a ternary quadratic regression orthogonal rotation experiment was designed to provide a reference for the adjustment of straw return parameters after spraying and elimination.(3)Based on the principle of fluid mechanics,the working process of slit-type fan nozzle was simulated using the Fluent module of ANSYS workbench workbench to explore the principle of fog liquid breaking and to simulate the drift of fog liquid under the influence of external airflow.A spray test bench was built and experiments were designed for the determination of the mist droplet drift rate to explore the effects on the spraying operation under the influence of different factors,which involved single factors as well as the coordinated effects of each factor,providing a basis for the establishment of a fuzzy controller.(4)A control system for spraying and killing devices was designed.A fuzzy controller with two inputs(wind,wind direction)and two outputs(rudder movement angle,electric regulating valve opening)based on the mamdani model was designed using fuzzy algorithms,and the corresponding affiliation functions were established.MIT App Inventor2 developed an Android control app,which is connected to the cell phone via Bluetooth to realize remote control of the system. |
