CN-121979118-A - Intelligent control method for traction speed of solar glass tube drawing machine

CN121979118ACN 121979118 ACN121979118 ACN 121979118ACN-121979118-A

Abstract

The invention relates to the technical field of industrial automation control, in particular to an intelligent control method for the traction speed of a solar glass tube drawing machine. The method comprises the steps of collecting an actual speed sequence of a traction motor, an actual measurement diameter sequence of a laser calliper and electrode current data of an electric melting furnace, preprocessing the actual speed sequence, the actual measurement diameter sequence of the laser calliper and the electrode current data to obtain a time sequence alignment sequence containing a plurality of continuous sampling points, carrying out linear regression analysis on the time sequence alignment sequence based on a preset sliding window, calculating actual control sensitivity, calculating a geometric sensitivity reference according to a preset target diameter, further obtaining a thermal speed coupling efficiency factor, carrying out lower limit limiting on the thermal speed coupling efficiency factor, carrying out dynamic compensation on PID gain by utilizing the thermal speed coupling efficiency factor, superposing a current feedforward quantity generation instruction, and driving the traction motor to carry out relevant adjustment. The invention effectively inhibits the control oscillation caused by the thermal speed reverse coupling effect, and realizes the safe and self-adaptive accurate control of the traction speed.

Inventors

ZHAO ZUNQING
KONG LINGXING
GAO FUJIAN
MO ZHENXIN
ZHANG ZAIZHI
ZHOU GUANGKUN
GAO JINCUN
Ming Xiliang

Assignees

山东信和光热有限公司

Dates

Publication Date: 20260505
Application Date: 20260130

Claims (10)

1. The intelligent control method for the traction speed of the solar glass tube drawing machine is characterized by comprising the following steps of: Acquiring the actual speed sequence of the traction motor, the actual measured diameter sequence of the glass tube and the electrode current data of the electric melting furnace in real time through a preset multidimensional data acquisition unit, and preprocessing to obtain a time sequence alignment sequence comprising a plurality of continuous sampling points; Presetting a sliding window, carrying out linear regression analysis on the time sequence alignment sequence based on the sliding window, calculating actual control sensitivity, and calculating a geometric sensitivity reference according to a preset target diameter; Based on the actual control sensitivity and the geometric sensitivity reference, calculating to obtain a thermal speed coupling efficiency factor, simultaneously calculating the change rate of the electrode current data, and constructing a feedforward compensation quantity by combining a pre-calibrated thermal speed conversion coefficient; and dynamically compensating the PID control gain based on the thermal speed coupling efficiency factor, and generating an adaptive speed control instruction by combining the feedforward compensation quantity so as to drive the traction motor to make relevant adjustment.
2. The intelligent control method for the traction speed of the solar glass tube drawing machine according to claim 1, wherein the actual control sensitivity satisfies the relation: Wherein, the Sensitivity is controlled for the actual; a length of the sliding window; for the serial number of the sampling point in the sliding window, the value range is 1 to ; Is the first in the sliding window The traction speed of each sampling point; is the first in the sliding window The measured diameters of the sampling points; an arithmetic average of the traction speeds of all the sampling points in the sliding window; and the arithmetic average value of the measured diameters of all the sampling points in the sliding window is obtained.
3. The intelligent control method for the traction speed of the solar glass tube drawing machine according to claim 1, wherein the geometric sensitivity reference is calculated based on a volume flow conservation law by combining an arithmetic average value of the target diameter and the traction speeds of all the sampling points in the sliding window.
4. The intelligent control method for the traction speed of the solar glass tube drawing machine according to claim 1, wherein the adaptive speed control instruction satisfies the relation: Wherein, the -Providing said adaptive speed control command; is the reference speed; is the thermal coupling efficiency factor; 、 Respectively preset proportional parameters and integral parameters; the deviation between the actual measured diameter of the current sampling point in the time sequence alignment sequence and the target diameter is obtained; The term is the historical cumulative sum of the deviations; for the thermal rate conversion coefficient to be the same, A rate of change for the electrode current data; The term is the feedforward compensation amount.
5. The intelligent control method for the traction speed of the solar glass tube drawing machine according to claim 1, wherein the thermal speed conversion coefficient is comprehensively calibrated through an open loop step experiment.
6. The intelligent control method for the traction speed of the solar glass tube drawing machine according to claim 1, wherein the preprocessing comprises the steps of unifying length measurement units of collected data, and performing time sequence alignment on the actual speed sequence and the actually measured diameter sequence to obtain the time sequence alignment sequence.
7. The intelligent control method for the traction speed of the solar glass tube drawing machine according to claim 1, wherein the step of collecting the actual speed sequence of the traction motor comprises the steps of reading the real-time operation frequency of the traction motor through a communication interface of a frequency converter driving the traction motor and converting the real-time operation frequency into a linear speed.
8. The intelligent control method for the traction speed of the solar glass tube drawing machine according to claim 1, wherein the multidimensional data acquisition unit comprises a traction motor encoder for acquiring the actual speed sequence, a laser calliper for acquiring the actual diameter sequence and a current transformer for acquiring the electrode current data.
9. The intelligent control method of the traction speed of the solar glass tube drawing machine according to claim 1, wherein the length of the sliding window is determined based on the transmission delay time of the traction motor in the traction process.
10. The method according to claim 1, further comprising presetting a lower safety threshold, determining whether the thermal coupling efficiency factor is smaller than the lower safety threshold, if so, assigning the thermal coupling efficiency factor as the lower safety threshold, and if not, the thermal coupling efficiency factor is unchanged.

Description

Intelligent control method for traction speed of solar glass tube drawing machine Technical Field The invention relates to the technical field of industrial automation control, in particular to an intelligent control method for the traction speed of a solar glass tube drawing machine. Background In the production and manufacture of glass tubes, the Danner or Vello method is usually adopted for shaping, in this process, a traction motor is a key actuator for controlling the geometric dimension of the glass tube, and directly controls the final diameter of the glass tube by changing the traction speed, and the diameter of the glass tube is reduced and conversely, the diameter is increased as the traction speed is increased according to the law of conservation of volume flow. However, the conventional control technology generally adopts a standard PID control algorithm, wherein a linear and stable inverse relation exists between the preset speed and the diameter, PID parameters are usually set to be a fixed value, but obvious thermal speed inverse coupling effect exists in actual production, and the method is characterized in that when a controller commands a traction motor to accelerate in order to reduce the pipe diameter of a glass pipe, high-temperature glass liquid in an electric melting furnace can be rapidly brought out by accelerated glass flow, the temperature of a forming area is increased, the viscosity of the glass liquid is reduced and becomes soft, the softened glass liquid is excessively thinned under the action of gravity, and the viscosity of the glass liquid is reduced and also the transmission efficiency of traction force of the traction motor is reduced. In addition, the fixed PID parameters are difficult to adapt to the thermal environment change caused by long-term production, and only can carry out hysteresis adjustment on the diameter error which occurs, so that potential interference existing in the enthalpy change inside the electric melting furnace can not be perceived. Disclosure of Invention In order to solve the problems of control failure and system oscillation caused by neglecting a thermal speed reverse coupling effect in the prior art, the invention provides an intelligent control method for the traction speed of a solar glass tube drawing machine, which comprises the following steps: The method comprises the steps of acquiring an actual speed sequence of a traction motor, an actual diameter sequence of a glass tube and electrode current data of an electric melting furnace in real time through a preset multidimensional data acquisition unit, preprocessing the actual speed sequence, the actual diameter sequence of the glass tube and the electrode current data of the electric melting furnace to obtain a time sequence alignment sequence comprising a plurality of continuous sampling points, presetting a sliding window, carrying out linear regression analysis on the time sequence alignment sequence based on the sliding window, calculating actual control sensitivity, calculating a geometric sensitivity reference according to a preset target diameter, calculating a thermal speed coupling efficiency factor based on the actual control sensitivity and the geometric sensitivity reference, calculating the change rate of the electrode current data, constructing a feedforward compensation quantity by combining a pre-calibrated thermal speed conversion coefficient, dynamically compensating PID control gain based on the thermal speed coupling efficiency factor, generating a self-adaptive speed control instruction by combining the feedforward compensation quantity, and driving the traction motor to carry out relevant adjustment. According to the invention, by constructing a comparison model of actual control sensitivity and geometric sensitivity reference, the influence degree of the traction speed of the traction motor on the diameter of the glass tube under the current process environment, particularly when the viscosity of the glass liquid is changed, is evaluated in real time, and the PID gain is dynamically adjusted accordingly, so that the control force can be automatically adjusted no matter how the viscosity of the glass liquid is changed. Further, the actual control sensitivity satisfies the relation: Wherein, the Sensitivity is controlled for the actual; a length of the sliding window; for the serial number of the sampling point in the sliding window, the value range is 1 to ;Is the first in the sliding windowThe traction speed of each sampling point; is the first in the sliding window The measured diameters of the sampling points; an arithmetic average of the traction speeds of all the sampling points in the sliding window; and the arithmetic average value of the measured diameters of all the sampling points in the sliding window is obtained. Compared with simple differential calculation, the method can effectively inhibit micro-jitter and high-frequency random noise of the multi