Characteristic test bench of pulse-width modulation (PWM) intermittent spray variable spraying system

Abstract

The invention discloses a characteristic test bench of a pulse-width modulation (PWM) intermittent spray variable spraying system. The characteristic test bench comprises a measurement and control system and a pipeline system, wherein the measurement and control system comprises an industrial personal computer, a signal conditioning unit, a power output module and an amplifier; the pipeline system comprises a diaphragm pump liquid supply device, an electric overflow device, a plurality of variable spraying units, a constant pressure liquid supply branch, a constant pressure outlet branch, an electromagnetic valve dynamic characteristic test unit and a multi-source pressure surge coupling characteristic test unit; a plurality of transparent pipeline sections and pressure sensors are arranged on a connection pipeline among a diaphragm pump outlet, a proportional overflow valve outlet, an electromagnetic valve inlet and outlet hole, a main pipeline and an electromagnetic valve, so as to carry out internal flow field characteristic test of the pipeline and pressure monitoring by using a high-speed image collection system or a flow field test system. The characteristic test bench of the PWM intermittent spray variable spraying system can be applied to testing of diaphragm pump pressure pulsation characteristics of the PWM intermittent spray variable spraying system, proportional overflow valve dynamic characteristics, electromagnetic valve dynamic characteristics and propagation characteristics of a multi-source pressure surge in the pipeline.

Description

technical field [0001] The invention relates to a characteristic test bench of a PWM intermittent spray type variable spraying system, which belongs to the field of characteristic testing and optimal design of agricultural equipment, in particular to the field of characteristic testing and optimal design of variable-variable spraying machines. Background technique [0002] In order to improve the effective utilization rate of pesticides, reduce the loss of pesticides, and improve the control effect, pesticide spraying equipment should spray the required amount of pesticides evenly and accurately to the affected areas according to the specific conditions of crop diseases, insect pests and weeds in each small area of ​​the farmland. That is, the variable is sprayed on the target. Variable target spraying can realize the low-pollution and high-efficiency utilization of pesticides, and it is an important development direction of plant protection machinery and pesticide applicati...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiency that the existing PWM intermittent spray type variable spraying test system cannot test the internal flow field of the pipeline, the present invention provides a PWM intermittent spray type variable spray system characteristic test bench, which can realize the outlet pipeline of the diaphragm pump, the proportional overflow The internal flow field test and pressure monitoring of the inlet pipeline of the flow valve and the inlet and outlet pipeline of the solenoid valve, etc., so as to lay the test foundation for the characteristic test, performance optimization and reasonable matching of each hydraulic component in the PWM intermittent spray variable spraying system

Images