Hydraulic rubber hoses are subject to great hydraulic impact during the actual working process, which causes a great potential safety hazard. Therefore, it is necessary to carry out pressure tests on hose assemblies to ensure its quality, so providing a high pressure for the hydraulic hose has become the key technology of this problem. Aiming at solving the problem of detection of pressure resistance in hydraulic rubber hose cleaning machines, this paper analyzed the pressurization mechanism of the hydraulic pressurized cylinder and proposed a method of continuous pressurization. This paper also theoretically analyzed the pressure expansion of the rubber hose, and the conclusion is that for the maximum hose capacity (hose size is Φ25 mm × 6 m), the volume of water required to provide water in the hose from 10 MPa to 100 MPa is 0.59 L. The pressurized cylinder was designed and checked theoretically and analyzed by the finite element method. It is concluded that the maximum stress of the pressurized cylinder is concentrated at the bottom of the high-pressure chamber, and the outlet hole at the bottom of the cylinder barrel of the high-pressure chamber is the weakest part of the pressurized cylinder. The performance of the supercharging cylinder is verified by experiments, which proves the feasibility, rapidity and stability of the supercharging cylinder.
In order to investigate the effect of the air deflector sprayer deflector angle on the droplet drift, this paper based on the particle tracking technology of the discrete phase model of CFD, studied the characteristics of droplets at different positions of the deflector angle. In this paper, six groups of nozzles are set at the air outlet in the cuboid calculation area with the conditions of 4000mm × 2000mm × 3300mm. Under the same wind conditions, the sprayer’s deflector changes and the droplet motion characteristics are analyzed. The results show that the droplets are accelerated by the high-speed airflow, and the velocity gradually becomes smaller as the distance increases. The speed is stable at a position close to the canopy of the fruit tree, and the speed is roughly between 8m / s-15m / s, which is almost the same as the wind speed delivered.
Aiming at the problem of excessive vertical bending and deformation of the frame due to the excessive weight of the air-driven electrostatic sprayer when fully loaded, and the crossbeam of the frame is prone to deformation. In this paper, the design and research of the frame are based on the mechanical principle, the Solidworks software is used to model the frame, and the ANSYS software is used to perform static analysis on the frame of the air-driven electrostatic sprayer when fully loaded, so as to obtain the stress and displacement of the frame. Verify the rationality and correctness of the finite element analysis. Finally, with the maximum deformation as the constraint, the lightweight design of the frame structure is carried out to complete the structural optimization of the frame.
The movement and distribution of the airflow field of the sprayer are very important for the distribution and penetration of the droplets. It is the focus and difficulty of the research to find the airflow field distribution of the fan outlet that matches the parameters of the canopy of the fruit tree. In order to study the influence of the angle change of the deflector of the orchard air-driven sprayer on the three-dimensional spatial distribution of the external air velocity field, this paper numerically simulated the external flow field based on computational fluid dynamics. The spray requirements of different fruit tree crown shapes were analyzed. The ICEM CFD software was used to model the external flow field. In order to improve the calculation efficiency, the model was divided into mixed grids. The k-ε turbulence model and Fluent solver are used for numerical solution. The flow fields of different deflectors are analyzed, and the influence of different positions and different sizes of deflector angles on the external flow field is determined.
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