Precise variable mist-spraying test device based on or including electric pump rotating speed regulation

Abstract

The invention provides a precise variable mist-spraying test device based on or including electric pump rotating speed regulation. By means of the test device, cost of a variable mist-spraying device can be effectively lowered, quality of variable mist spraying operation can be improved, and application of precise variable mist spraying to practical production is promoted. The test device comprises a mist-spraying parameter acquisition device, an operating velocity simulator, a mist spraying structure, a display device and a controller; the operating velocity simulator comprises a velocity sensor; the mist spraying structure comprises a liquid chemical box, electric pumps, a pressure tank and a chemical conveying pipe which are sequentially connected, and more than one spray nozzles are arranged on the chemical conveying pipe; the mist-spraying parameter acquisition device comprises a flow sensor arranged at an inlet of the pressure tank and a pressure sensor mounted on the pressure tank; the controller is connected with the display device, the flow sensor, the pressure sensor and the velocity sensor.

Description

technical field [0001] The invention relates to the technical field of precision agricultural machinery, in particular to a precise variable spray test device based on or including the adjustment of the rotational speed of an electric pump. Background technique [0002] At present, precision variable spraying technology has become the key development direction of farmland pesticide application technology, and is a research hotspot in the field of precision agriculture at home and abroad. The main control methods of precision variable spraying technology are: pressure regulation, direct injection concentration regulation and flow regulation There are three types. Among them, the control method of pressure adjustment adopts reciprocating diaphragm pump as the liquid supply device. By controlling the opening degree of the solenoid valve, the pressure of the outlet pipeline is adjusted to achieve the purpose of indirectly adjusting the flow rate. The cost of this control method ...

AI Technical Summary

Problems solved by technology

Among them, the control method of pressure adjustment adopts reciprocating diaphragm pump as the liquid supply device. By controlling the opening degree of the solenoid valve, the pressure of the outlet pipeline is adjusted to achieve the purpose of indirectly adjusting the flow rate. The cost of this control method is low, but due to the electromagnetic The response time of the valve switch is long, which cannot meet the requirements of real-time changes in the spray volume according to the operating speed in the field operation state; the direct injection concentration adjustment method separates the agent and the solvent, and pumps them out through the respective liquid pumps and mixes them in the pipeline. After reaching the nozzle, the variable spray can be realized by changing the concentration of the mixed liquid medicine by changing the pumping amount of the medicine. This method can effectively avoid the corrosion of the liquid medicine on the liquid tank, but there are uneven mixing of the liquid medicine and the volume, variable spray response time Long problem; the flow-adjustable variable spray system adjusts the actual spray flow of the nozzle by changing the signal frequency and duty cycle of the solenoid valve of the nozzle. Its flow adjustment range is large and the atomization characteristics are consistent. The atomization effect and the stability of spray volume, and the need to install a high-frequency solenoid valve on each nozzle, greatly increases the cost of the variable spray system and limits the practical application of this variable spray system

[0003] In summary, the existing variable spray technology has problems such as long response time, uneven mixing of liquid medicine, poor atomization effect consistency, and high cost, which affect the popularization and application of variable spray technology in actual production.

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