CN-122012890-A - Continuous annealing system for wide aluminum alloy plate

CN122012890ACN 122012890 ACN122012890 ACN 122012890ACN-122012890-A

Abstract

The invention relates to the technical field of aluminum processing equipment and discloses a wide aluminum alloy plate continuous annealing system which comprises an air cushion furnace, an air supply cooling mechanism, a flow field sensing array and a central control device, wherein the sensing array is used for collecting pressure in the furnace, a signal collecting module is used for decomposing the pressure into a time-average component and a pulsation component, a dynamic baseline reconstruction module is used for calculating a normalized pressure factor by utilizing a flow resistance network model and combining a fan rotating speed and a valve opening degree to eliminate equipment action interference, a plate shape analysis module is used for adjusting the valve array according to the normalized factor to control a plate shape, a flutter monitoring module is used for adjusting the fan rotating speed according to the pulsation component to change pneumatic rigidity to inhibit flutter, and a heat balance module is used for correcting the linear speed of a plate according to heat exchange capacity change. The invention decouples the plate-shaped detection signal and the equipment operation state, realizes the cooperative control of multiple physical fields, and ensures the flatness, the running stability and the constant process temperature of the plate.

Inventors

ZHU ZHENDONG
ZHANG QUANCHENG
ZHANG JIANHUA
WANG XIANGLING
WANG XIAOJIANG
WU YONGXIN
YE KAI
YU YUE

Assignees

江苏常铝铝业集团股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260121

Claims (10)

1. The wide aluminum alloy plate continuous annealing system is characterized by comprising an air cushion type annealing furnace main body (10), an air supply and cooling executing mechanism (20), a multidimensional flow field sensing array (30) and a central control device (40); A hearth channel is arranged in the air cushion type annealing furnace main body (10) along the running direction of the plate (2), and an upper static pressure box (11) and a lower static pressure box (12) are arranged on the upper side and the lower side of the hearth channel; the air supply and cooling executing mechanism (20) comprises a circulating fan (21) and an air quantity adjusting valve array (22); The multi-dimensional flow field sensing array (30) comprises a pressure sensor (31); the central control device (40) is used for: The signal acquisition and distribution module (41) is used for decomposing an original pressure signal acquired by the pressure sensor (31) into a time-sharing pressure component and a pulsation pressure component; The dynamic baseline reconstruction module (42) calculates theoretical reference pressure according to the rotating speed of the circulating fan (21) and the opening degree of the air quantity regulating valve array (22), and combines the time-sharing pressure components to generate a normalized pressure factor; the plate shape characteristic analysis module (43) adjusts the air quantity adjusting valve array (22) to control the plate shape according to the normalized pressure factor; And the vibration monitoring and rigidity changing module (44) adjusts the rotating speed of the circulating fan (21) according to the pulsating pressure component to restrain the plate (2) from vibrating.
2. A continuous annealing system for wide aluminum alloy sheet as set forth in claim 1, wherein said multi-dimensional flow field sensing array (30) follows a laterally arrayed and vertically aligned layout; The circulating fan (21) is connected with the upper static pressure box (11) and the lower static pressure box (12), and the air quantity adjusting valve array (22) is used for controlling transverse air inlet of the upper static pressure box (11) and the lower static pressure box (12); Pressure taking points are arranged in the upper static pressure box (11) and the lower static pressure box (12) at equal intervals along the transverse width direction, and the pressure taking points in the upper static pressure box (11) are aligned with corresponding pressure taking points in the lower static pressure box (12) in the vertical direction; The pressure sensors (31) are communicated with the upper static pressure box (11) and the lower static pressure box (12) through high-temperature-resistant pressure guiding pipes, and all the pressure sensors (31) execute high-frequency synchronous acquisition based on the same clock source.
3. A continuous annealing system for wide aluminum alloy sheet according to claim 1, wherein said signal acquisition and distribution module (41) performs a two-pass digital filtering process: Extracting the time-sharing pressure component reflecting hydrostatic characteristics from the original pressure signal by a low-pass filtering algorithm; extracting said pulsating pressure component reflecting hydrodynamic features from the raw pressure signal by means of a high-pass filtering algorithm or a band-pass filtering algorithm; and the system performs time sequence alignment compensation on the filtered signals in the processing process, so that the time-sharing pressure component and the pulse pressure component which are output at the same moment correspond to the same physical sampling moment.
4. A continuous annealing system for wide-format aluminum alloy sheets as claimed in claim 1, characterized in that the dynamic baseline reconstruction module (42) stores a flow resistance network model for eliminating the disturbance of the air supply and cooling actuator (20) to the measurement data in the plate shape decoupling calculation; the flow resistance network model defines the circulating fan (21) as a pressure potential source and the air quantity regulating valve array (22) as a variable fluid resistance; The theoretical reference pressure is calculated based on a pre-calibrated equipment fluid characteristic map, and pressure values which the upper static pressure tank (11) and the lower static pressure tank (12) should have under a standard no-load state are determined according to the current rotating speed of the circulating fan (21) and the opening degree of the air quantity regulating valve array (22).
5. A continuous annealing system for wide aluminum alloy sheet material as set forth in claim 4, wherein said dynamic baseline reconstruction module (42) generates said normalized pressure factor by calculating a ratio of said time-averaged pressure component measured to said theoretical reference pressure calculated; The normalized pressure factor is used for representing the deviation degree of the actual suspension gap of the plate (2) relative to the nominal design gap, and the numerical value of the normalized pressure factor is independent of the rotating speed adjusting action of the circulating fan (21) and the opening adjusting action of the air quantity adjusting valve array (22).
6. A continuous annealing system for wide aluminum alloy sheet material according to claim 5, characterized in that said plate shape feature analyzing module (43) is for: Calculating a plate shape characteristic index according to the differential ratio of the normalized pressure factors corresponding to the upper static pressure tank (11) and the lower static pressure tank (12) on the same transverse section, and reconstructing the transverse plate shape profile of the plate (2) based on the plate shape characteristic index; According to the thermoelastic mechanics principle, calculating the transverse temperature difference distribution required by the geometric deformation in the transverse elimination plate-shaped profile, mapping the transverse temperature difference distribution into a target opening instruction of the air quantity regulating valve array (22) of the cooling section, and generating corrected thermal stress by establishing a non-uniform temperature field on the transverse width of the plate (2).
7. A continuous annealing system for wide aluminum alloy sheet according to claim 1, wherein said flutter monitoring and stiffness varying module (44) is adapted to: Performing frequency spectrum analysis on the pulsating pressure component to obtain power spectrum density, and calculating a flutter intensity index; generating a rotational speed frequency adjustment instruction for the circulating fan (21) when the flutter intensity index indicates that the system is in a flutter latency state or a flutter divergence state; The rotating speed frequency adjusting instruction is used for changing pneumatic vertical rigidity of the air cushion supporting system, so that the natural frequency of the air cushion supporting system avoids the current dominant flutter frequency of the plate (2).
8. A continuous annealing system for wide aluminum alloy sheet according to claim 1, wherein said central control device (40) further comprises a thermal balance co-compensation module (45), said thermal balance co-compensation module (45) being adapted to: Aiming at the adjustment of the opening degree of the air quantity adjusting valve array (22) and the adjustment of the rotating speed of the circulating fan (21), calculating the change rate of the comprehensive heat exchange capacity factor based on the real-time rotating speed frequency of the circulating fan (21) and the flow correction coefficient of the air quantity adjusting valve array (22); And generating a correction instruction for the running line speed of the plate (2) according to the change rate of the comprehensive heat exchange capacity factor and the law of conservation of energy, and maintaining the target metal temperature of the plate (2) to be constant in the annealing process.
9. The continuous annealing system for wide aluminum alloy sheet material in accordance with claim 4, wherein said equipment fluid property profile is generated by full condition traversal scan calibration, the calibration process comprising: and under the standard no-load state, controlling the circulating fan (21) to perform stepped adjustment within a rated working range, simultaneously controlling the air quantity adjusting valve array (22) to perform stepped sweep within a full stroke range, recording pressure equalizing force measured values corresponding to each working point when the upper static pressure box (11) and the lower static pressure box (12) are used, and obtaining a functional relation about the rotating speed frequency and the opening position by utilizing least square fitting.
10. The continuous annealing system for wide aluminum alloy sheets according to claim 6, wherein said air supply and cooling actuator (20) performs opening calculation by using a preset inverse model of valve flow characteristics when executing said target opening command; And the valve flow characteristic inverse model reversely calculates the target opening instruction after eliminating the influence of the valve nonlinear flow characteristic according to the target volume flow and the real-time pressure difference or estimated pressure difference at the two ends of the air quantity regulating valve array (22), and performs dead zone verification and amplitude limiting processing on the output instruction.

Description

Continuous annealing system for wide aluminum alloy plate Technical Field The invention relates to the technical field of aluminum processing equipment, in particular to a continuous annealing system for a wide aluminum alloy plate. Background With the development of the automobile light-weight and aerospace industries, the demand for high surface quality wide-width aluminum alloy sheets has increased. The air cushion type continuous annealing furnace forms an air cushion by utilizing high-speed air flows sprayed by the upper nozzle and the lower nozzle, realizes the non-contact suspension support and heat treatment of the plate, and avoids surface scratch caused by a roller hearth furnace. However, existing systems have signal coupling problems in terms of plate shape evaluation. The common technology relies on the static pressure distribution of an air cushion to reversely push the plate shape, but the static pressure value is simultaneously influenced by the plate suspension gap, the rotating speed of a circulating fan and the opening of a regulating valve. When the air quantity is adjusted to adapt to the process, the pressure baseline drifts, and the control system is difficult to distinguish whether the pressure change is caused by plate defects or equipment adjustment, so that the plate shape identification accuracy is insufficient. In addition, the broad-width plate is easy to generate flutter under the air flow support. The existing air cushion has fixed supporting rigidity, lacks an active inhibition means, and is easy to generate unstable flapping and even scraping under a high-speed working condition. At the same time, adjusting the fan or valve changes the convective heat transfer coefficient. The conventional control strategy often ignores the influence of the flow field change on the plate temperature, so that the annealing temperature fluctuation is caused when the plate shape correction or vibration suppression operation is performed, and the product performance consistency is affected. Disclosure of Invention The invention provides a wide aluminum alloy plate continuous annealing system which can eliminate coupling interference among plate shape correction, pneumatic stability control and process temperature maintenance and realize high-precision plate shape flatness and high-speed stable operation. The invention provides a wide aluminum alloy plate continuous annealing system which comprises an air cushion type annealing furnace main body, an air supply and cooling executing mechanism, a multidimensional flow field sensing array and a central control device. And a hearth channel is arranged in the air cushion type annealing furnace main body along the running direction of the plate, and an upper static pressure box and a lower static pressure box for generating air cushion supporting force are arranged on the upper side and the lower side of the hearth channel. The air supply and cooling executing mechanism comprises a circulating fan connected with the upper static pressure box and the lower static pressure box and an air quantity regulating valve array for controlling the transverse air inlet distribution of the upper static pressure box and the lower static pressure box. The multi-dimensional flow field sensing array includes pressure sensors disposed within the upper static pressure tank and the lower static pressure tank. The central control device comprises a signal acquisition and distribution module, a pressure sensor and a pressure sensor, wherein the signal acquisition and distribution module is used for acquiring signals of the pressure sensor and decomposing original pressure signals into a time-sharing pressure component representing hydrostatic characteristics and a pulsating pressure component representing the hydrodynamic characteristics; The dynamic baseline reconstruction module is used for calculating theoretical reference pressure according to the rotating speed of the circulating fan and the opening degree of the air quantity regulating valve array, generating a normalized pressure factor by combining the time-sharing pressure component, and eliminating the interference of the air supply and cooling execution mechanism on measurement data; The plate shape characteristic analysis module is used for adjusting the air quantity adjusting valve array to control the plate shape according to the normalized pressure factor; and the vibration monitoring and rigidity changing module is used for adjusting the rotating speed of the circulating fan according to the pulsating pressure component so as to inhibit the plate vibration. Preferably, the multidimensional flow field sensing array adopts a layout mode of transverse array and vertical alignment, namely pressure taking points are arranged in the upper static pressure box and the lower static pressure box at equal intervals along the transverse width direction, and the corresponding pressure taking points in the upper static p