Construction method and device of multi-spraying-head flow control model

A technology of flow control and construction method, which is applied in the direction of flow control using electric devices, etc., and can solve the problems that the flow control model of the nozzle is not enough to apply to the working scene of multiple nozzles, and cannot be corrected.

A technology of flow control and construction method, which is applied in the direction of flow control using electric devices, etc., and can solve the problems that the flow control model of the nozzle is not enough to apply to the working scene of multiple nozzles, and cannot be corrected.

CN109725655AActive Publication Date: 2019-05-07SOUTH CHINA AGRI UNIV
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  • Construction method and device of multi-spraying-head flow control model
  • Construction method and device of multi-spraying-head flow control model
  • Construction method and device of multi-spraying-head flow control model

Examples

Experimental program
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Effect test

Embodiment 1

[0104] For example, a fine mist hollow cone nozzle with a fog cone angle of 80° is used; a total of 4 nozzles are used, the working pressure is 0.4-0.5MPa, and the corresponding flow range is 1.82-2.03L / min. If the 4 nozzles are turned on at the same time, the total The flow rate can reach up to 8.12L / min. Working pressure: The maximum working pressure of the variable spray device is 0.5MPa. In order to improve the reliability of the control, a solenoid valve with a working pressure exceeding 0.5MPa should be selected. A direct-acting solenoid valve is selected to work at a higher switching frequency. The variable spray device uses a total of 4 nozzles, and each nozzle is individually controlled by a 2-point solenoid valve.

[0105] Using the above test platform, the user interface provided by the PC host computer can adjust the experimental parameters in real time, and set the frequency and duty cycle of the control signal output by the solenoid valve controller. The PWM co...

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Abstract

The invention discloses a construction method and device of a multi-spraying-head flow control model. The construction method comprises the steps: the pipeline pressure and the PWM control signal frequency of a solenoid valve are obtained; based on a control variable method, according to the pipeline pressure and the PWM control signal frequency of the solenoid valve, the PWM control signal duty ratio of the solenoid valve is adjusted to enable the solenoid valve to be opened and closed for multiple times so as to control the work flow; flow data are fed back in real time through a flow sensorto obtain a flow dataset; according to the duty ratio and the flow dataset, a fitting curve is obtained through polynomial fitting, and a dynamic function of a multi-spraying-head flow about the PWMcontrol signal duty ratio of the solenoid valve is generated; the dynamic function is analyzed and processed through the polynomial fitting curve; and a PWM control signal duty ratio function, takingthe multi-spraying-head flow as a variable, of the solenoid valve is calculated, and the multi-spraying-head flow control model is constructed. The multi-spraying-head flow control model provides a dynamic adjustment strategy for the multi-spraying-head flow, and can be applied to multi-spraying-head working scenes.

Description

technical field [0001] The invention relates to the technical field of agricultural information detection and data, in particular to a method and device for constructing a multi-nozzle flow control model. Background technique [0002] In the pesticide spraying of mountain orchards, the application of the pipeline constant pressure spray system ensures the uniformity and better penetration of spray droplets; in the flow control link of the constant pressure spray system of mountain orchards, it is common to change the The rotational speed of the liquid medicine pump reaches the control of the flow in the pipeline. The flow control method based on PWM technology can make the solenoid valve switch frequently through the PWM signal, so as to control the working flow stably and efficiently; the pipeline flow is mainly determined by the pipeline liquid pressure, the frequency and duty cycle of the PWM control signal controlling the solenoid valve Decide. [0003] The existing no...

Claims

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Application Information

Patent Timeline
07 May 2019
Publication
CN109725655A
IPC
G05D7/06
Inventors
宋淑然; 孙少立