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A consistency control method and system for jet dispensing process

A control method and consistency technology, which is applied to the device and coating of the surface coating liquid, can solve the problems of inability to measure the volume of glue droplets in real time and poor consistency of glue spraying volume, etc.

Inactive Publication Date: 2016-08-31
CENT SOUTH UNIV
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Problems solved by technology

[0005] The invention provides a consistency control method and system for the jet dispensing process, aiming at the problem that the jet dispensing cannot provide real-time feedback measurement of the sprayed glue droplet volume and the poor consistency of the sprayed glue volume in the industrial process. The mathematical model realizes soft measurement feedback. Based on this soft measurement, two feedback loops are used to realize the consistent real-time control of the controller and the consistent compensation control, and finally realize the improvement of the consistency of jet dispensing

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  • A consistency control method and system for jet dispensing process
  • A consistency control method and system for jet dispensing process
  • A consistency control method and system for jet dispensing process

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] In the process of LED jet dispensing, batch dispensing often takes a relatively long time. During this time, the viscosity of silica gel will undergo drift changes, and the viscosity will gradually increase with time. For this reason, the ability of the glue spray valve to spray glue will gradually weaken, and the volume of glue droplets will gradually decrease. Ultimately lead to poor volume consistency of the batch glue droplet.

[0028] The main function of the invention is to compensate the glue supply pressure of the glue spray valve in real time through the control algorithm and the monitoring of the glue weight, so that the volume of the finally sprayed glue can maintain a better consistency.

[0029] Such as figure 1 As shown, it is a schematic diagram of hardware connection for implementing consistency control according to the method ...

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Abstract

The invention discloses a spraying dispensing and consistency control method and system. A glue drop volume demand signal R and a soft measurement feedback signal Y1 are taken as error signals E of an input controller C, a glue supply pressure signal U1 output from the controller and a glue supply pressure compensating signal U2 output from a filter F are superposed to act in the actual glue spraying process, and an electronic pressure regulating valve in a glue spraying system is regulated to control the volume Y of glue drops sprayed from the glue spraying system. The method of performing soft measurement feedback through an internal mathematic model is used for performing real-time detection on the volume of the glue drops. The glue drops sprayed from the glue spraying system are weighed by a precision scale in batches, the mean value of the weight results obtained by weighing is figured out and is compared with the output of the internal mathematic model, then the internal mathematic model is regulated based on a self-adaptive regulation strategy to enable the internal mathematic model to keep the identical relation with the input and the output in the dispensing process, and thus the spraying and dispensing consistency is improved.

Description

technical field [0001] The invention belongs to the field of industrial control process, and relates to a consistency control method and system for the jet dispensing process. Background technique [0002] In the LED manufacturing process, the dispensing process has an important impact on the key quality factors of LEDs. The viscosity and other properties of the glue will change during the working process, resulting in a change in the volume consistency of the glue droplet. The volume consistency of glue droplets can directly affect the uniformity of heating and color temperature of LEDs. For example, uneven heating can cause LEDs to easily fail, and poor color temperature consistency will lead to the need to divide batches according to the color temperature of the product during the production process, which will increase additional costs; it will also affect the appearance of the LED due to inconsistent color temperature during use. . [0003] In the current industrial ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B05C11/10B05C5/00
Inventor 李涵雄沈平
Owner CENT SOUTH UNIV
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