CN-122006987-A - Automatic shading control method and system for UV (ultraviolet) furnace based on process parameter linkage

CN122006987ACN 122006987 ACN122006987 ACN 122006987ACN-122006987-A

Abstract

The invention relates to the field of industrial automation control, in particular to an automatic shading control method and system for a UV (ultraviolet) furnace based on process parameter linkage. The method comprises the steps of obtaining a reference pulse count value of the tail end of a workpiece on a conveyor belt, obtaining instantaneous pulse frequency related to the speed of the conveyor belt and pulse frequency change rate related to acceleration, calculating a dynamic displacement prediction index, generating a corrected trigger pulse threshold value, subtracting the dynamic displacement prediction index from the sum of the reference pulse count value and the set pulse number of the physical distance from a sensor to a light shielding plate, and sending a closing instruction to the light shielding mechanism when the real-time pulse count value reaches the trigger pulse threshold value. The scheme of the invention can enable the automatic shading control of the UV furnace to be more accurate.

Inventors

WU JIEFEI
XIAO YUANJIE
TANG ZHICHENG

Assignees

东莞市海派自动化科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260209

Claims (10)

1. The automatic shading control method for the UV furnace based on the linkage of the technological parameters is characterized by comprising the following steps: acquiring a reference pulse count value of the tail end of a workpiece on a conveyor belt; acquiring an instantaneous pulse frequency related to the speed of the conveyor belt and a pulse frequency change rate related to acceleration; Calculating a dynamic displacement prediction index, wherein the dynamic displacement prediction index is determined by an instantaneous pulse frequency and a pulse frequency change rate according to a kinematic model; Generating a corrected trigger pulse threshold value, wherein the trigger pulse threshold value is equal to the sum of the reference pulse count value and the set pulse number of the physical distance from the sensor to the light shielding plate, and subtracting the dynamic displacement prediction index; And when the real-time pulse count value reaches the trigger pulse threshold, sending a closing instruction to the shading mechanism.
2. The automatic shading control method for a UV furnace based on technological parameter linkage according to claim 1, wherein the dynamic displacement prediction index is The calculation method of (1) is as follows: ; Wherein, the For the instantaneous pulse frequency; For the pulse frequency rate of change; is the inherent response time of the shade mechanism.
3. The process parameter linkage-based automatic shading control method for a UV furnace according to claim 1 or 2, wherein the corrected trigger pulse threshold value The calculation method of (1) is as follows: ; Wherein, the -Counting the number of reference pulses; the number of pulses for the physical distance; the dynamic displacement prediction index is used; The safety margin coefficient is a safety margin coefficient with the value range of 1.0-1.05.
4. The process parameter linkage-based automatic shading control method for a UV furnace according to claim 1, wherein obtaining the instantaneous pulse frequency and the pulse frequency change rate comprises: performing differential processing on the pulse signal of the encoder within a set time window to obtain the instantaneous pulse frequency; and carrying out differential processing on a plurality of continuous instantaneous pulse frequencies to obtain the pulse frequency change rate.
5. The process parameter linkage-based automatic shading control method for a UV furnace according to claim 1, further comprising: Calculating the deviation between the actual position and a target position, wherein the target position is the sum of the reference pulse count value and the physical distance pulse number; The intrinsic response time is self-correcting based on the deviation.
6. The process parameter linkage-based automatic shading control method for a UV furnace according to claim 1, wherein the self-correction comprises: If the actual closing position is advanced in the conveying direction from the target closing position, reducing the mechanical response time; If the actual closing position lags the target closing position in the conveying direction, the mechanical response time is increased.
7. The process parameter linkage-based automatic shading control method for a UV furnace according to claim 1, wherein obtaining the reference pulse count value comprises: and when the photoelectric sensor detects that the tail end of the workpiece passes, recording the current pulse count value of the encoder as the reference pulse count value.
8. The process parameter linkage-based automatic shading control method for a UV furnace according to claim 1, wherein the inherent response time of the shading mechanism is a pre-calibrated physical time constant, representing the time period from when the controller sends a closing command to when the shading mechanism completes an effective shading action.
9. The automatic shading control method for the UV furnace based on the technological parameter linkage according to claim 1, wherein the shading mechanism is a pneumatic shutter or an electric shutter mechanism.
10. Automatic shading control system of UV stove based on technology parameter linkage, its characterized in that includes: A processor; A memory storing computer instructions for process parameter linkage based UV furnace automatic shade control, which when executed by the processor, cause the system to perform the process parameter linkage based UV furnace automatic shade control method according to any one of claims 1-9.

Description

Automatic shading control method and system for UV (ultraviolet) furnace based on process parameter linkage Technical Field The invention relates to the field of industrial automation control. More particularly, the invention relates to an automatic shading control method and system for a UV furnace based on process parameter linkage. Background UV light curing technology (Ultraviolet Curing) has become a core process for PCB fabrication, semiconductor thin film curing, and precision optical element packaging due to its second level curing, low contamination, and space saving properties. In these fields, stable operation of the conveyor belt and accurate opening of the UV lamp tube are key to ensuring yield. To cope with the gap created by intermittent feeding or irregular arrangement, the prior art often employs pulse counting position synchronization algorithms based on incremental encoders. The pulse counting position synchronization algorithm based on the incremental encoder determines the triggering position of the action of the light shielding plate by recording the pulse value of the encoder when the workpiece passes through the sensor and combining the fixed pulse increment corresponding to the physical distance between the sensor and the light shielding plate, so that the light shielding plate is closed in a gap period when no workpiece passes through to save energy and reduce emission. However, the existing pulse counting control means has a significant technical limitation, that is, the existing pulse counting control means often ignores the coupling relation between the physical lag time of the actuator and the speed of the conveyor belt, that is, the problem of speed-position mismatch. Specifically, mechanical shade mechanisms (e.g., pneumatic shutters or electric rams) require an inherent physical response time (e.g., 200 milliseconds) from receiving a command to fully closing. However, in conventional algorithms, the pulse threshold for triggering an action is typically fixed. The 200 ms corresponds to a shorter transport distance when the conveyor is running at low speed, and the distance the workpiece moves within the same 200 ms increases significantly when the conveyor is running at high speed or in an acceleration phase. This difference results in the mask not being closed in place at high drive speeds, the workpiece may have entered the mask area (causing light leakage) or the mask closing too late (causing edge ineffective illumination), whereas at low speeds the closing may be advanced causing pinching of the workpiece. Therefore, the existing static pulse counting cannot meet the high-precision shading requirement under variable-frequency speed regulation or unsteady speed, so that the automatic shading control of the UV furnace has the problem of inaccuracy. Disclosure of Invention The invention aims to provide an automatic shading control method and system for a UV (ultraviolet) furnace based on technological parameter linkage, which are used for solving the problem that the automatic shading control of the UV furnace is inaccurate due to the fact that the existing algorithm in the prior art cannot adapt to the high-precision shading requirement under variable-frequency speed regulation or unsteady speed. In a first aspect, the method for controlling automatic shading of a UV furnace based on linkage of process parameters provided by the invention comprises the following steps: acquiring a reference pulse count value of the tail end of a workpiece on a conveyor belt; acquiring an instantaneous pulse frequency related to the speed of the conveyor belt and a pulse frequency change rate related to acceleration; Calculating a dynamic displacement prediction index, wherein the dynamic displacement prediction index is determined by an instantaneous pulse frequency and a pulse frequency change rate according to a kinematic model; Generating a corrected trigger pulse threshold value, wherein the trigger pulse threshold value is equal to the sum of the reference pulse count value and the set pulse number of the physical distance from the sensor to the light shielding plate, and subtracting the dynamic displacement prediction index; And when the real-time pulse count value reaches the trigger pulse threshold, sending a closing instruction to the shading mechanism. According to the scheme, the instantaneous pulse frequency (speed) and the pulse frequency change rate (acceleration) of the conveyor belt are obtained in real time, and the displacement prediction index of the light shielding mechanism in the inherent response time is dynamically calculated, so that the mechanical hysteresis is compensated in real time when the trigger threshold is generated, the problem that the conventional static pulse counting technology cannot adapt to the speed change or the unsteady operation of the conveyor belt is effectively solved, the light shielding time deviation caused by the mismatch of the speed a