Experimental Study On Collision And Sedimentation Of Combined Spray System With Top Spray And Side Spray

Spray technology is now the most mainstream of a plant protection operations,and the diversification of spray boom is also a social trend.It has a wide range of attention to the spray technology in china,but the spray machine of spray boom mainly uses the horizontal boom as a technology,with the structure of a single,need more diversified structure of the spray boom to be applied in the agriculture,and combined with the new electrostatic spray technology,So as to a greater extent to improve the efficiency of spraying operations.In view of the above phenomenon,I have read a number of literature and combined with the actual situation,to design combined electrostatic spray test device combined with top spray and side spray,the device combines the top spray and side spray,to achieve a multi-directional application of technology with the electrostatic spray technology,and it provide a better basis for the future development of industry of plant protection.They include the following aspects in the main research and work results:(1)Design of combined electrostatic spray test system combined with top spray and side sprayIt is the design of combined electrostatic spray test system combined with top spray and side spray,including the design of the spray boom structure and electrostatic spray system design.In which the spring on the combined spray boom and the overall size of the selection were compared and tested,to select the appropriate size and material of the spring,with a contact charge method.(2)Study on the collision between boom and branch by numerical simulation method.The finite element model of boom and cotton is established by simulating the collision process of LS-DYNA of boom and cotton,and the finite element model is used to establish the finite element model.The error value is less than 10% compared to the offset distance of the position H2312 on the boom on the boom in the simulation.The actual variation curve of the contact force between the boom and the cotton is also analyzed and compared.The result of the verification is that the changetrend of the force in the experiment is less than 10% of the variation of the contact force in the simulation and the result is considered to be mutually validated.(3)The test of collision and analysis of the result of boom in combined spray boom In addition,the distance between the nozzle and the contact force F of the boom is simulated by two factors,and the change rule of the maximum deviation distance S_max of the nozzle under the change of the collision speed v and the contact position h is obtained.The offset distance S_max is linearly related to the collision velocity v and the contact position h.Through the simulation experiment of the laboratory based on high-speed imaging technology,the trajectory of the nozzle is obtained and the area of heavy spray and mist spray on the plant is obtained,and the electrostatic spray can promote the uniformity of the spray deposition in the middle layer of the plant and reduce the phenomenon of heavy spray and leakage leakage.(4)Spray deposition test of electrostatic boom sprayingThe influence of various factors on the coverage and coefficient of variation of spray deposition is studied by the spray system in the second chapter.The test mainly considered whether the effects of static electricity,spray pressure,spray speed and spray height on the depositional distribution are considered.The experimental design method of orthogonal design is also used to design the experimental parameter arrangement.The optimum values for the combination of spray pressure,spray height and operating speed in the absence of static electricity and electrostatic environment are 0.5mpa,350 mm,1.0m / s and 0.4mpa,350 mm,1.0m / s.The influence of the experimental parameters on the deposition effect under static and non-electrostatic spraying is studied by using the variance analysis method.The deposition performance in the practical application of the horizontal boom is also compared with that of the combined electrostatic spray analysis.