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Method for controlling flow velocity of LED coating machine coating head

A flow rate control and coating machine technology, applied in the directions of injection devices, electrical components, circuits, etc., can solve problems such as low yield, affect coating uniformity, and unstable nozzle flow rate, to ensure uniformity and improve yield. Effect

Inactive Publication Date: 2020-04-28
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the traditional LED coating machine does not strictly control the flow rate of the nozzle. With the reduction of material in the barrel or other disturbance factors, the flow rate of the nozzle is always in an unstable state, which affects the uniformity of the final coating and the yield rate. Low

Method used

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  • Method for controlling flow velocity of LED coating machine coating head
  • Method for controlling flow velocity of LED coating machine coating head

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Embodiment Construction

[0028] The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0029] like figure 1 , a method for controlling the flow rate of a nozzle of an LED coating machine, comprising the following steps:

[0030] Step 1. According to the actual operation of the LED coating machine, analyze the relevant input and output volumes, and filter out the variables that can affect the flow rate of the nozzle of the LED coating machine. As the input of the BP neural network model, the nozzle of the LED coating machine The flow rate is taken as the output of the BP neural network. Finally, the cylinder air pressure x1, nozzle thimble opening x2, material concentration x3, peristaltic pump motor speed x4, material height in the barrel x5 are selected as input, and the flow rate y1 of the nozzle of the LED coating machine is used as output. .

[0031]...

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Abstract

The invention discloses a method for controlling flow velocity of an LED coating machine coating head. The method comprises the following steps of selecting a correlation quantity as an input of a BPneural network model according to the actual operation condition of an LED coating machine, and taking the coating flow velocity as an output of a BP neural network; recording and storing on-site historical data, selecting the data as a training sample set, and obtaining predicted coating head flow velocity through a BP neural network method; and adopting a historical data iteration mode to adjustthe coating head flow velocity predicted by a charging cylinder body air pressure control model to be continuously close to ideal flow velocity. According to the method, the problem of poor uniformity due to the fact that the flow velocity of the coating head is unstable in the coating process of the LED coating machine can be solved.

Description

technical field [0001] The invention relates to the field of nozzle flow rate control, in particular to a method for controlling the nozzle flow rate of an LED coating machine. Background technique [0002] The BP neural network does not need to determine the mathematical equation of the mapping relationship between input and output in advance, but only learns certain rules through its own training, and obtains the result closest to the expected output value when the input value is given. Its basic idea is the gradient descent method, which uses gradient search technology to minimize the mean square error between the actual output value of the network and the expected output value. [0003] White LED is a new type of semiconductor all-solid-state lighting source. Compared with traditional lighting technology, this new type of light source has leading advantages such as high efficiency and energy saving, long life, small size, easy maintenance, green environmental protection...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05B12/00H01L33/50
CPCB05B12/00H01L33/50H01L2933/0041
Inventor 胡跃明曹连洋王欢
Owner SOUTH CHINA UNIV OF TECH