CN107931554B - Continuous casting billet positioning calculation method - Google Patents
Continuous casting billet positioning calculation method Download PDFInfo
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- CN107931554B CN107931554B CN201711243982.7A CN201711243982A CN107931554B CN 107931554 B CN107931554 B CN 107931554B CN 201711243982 A CN201711243982 A CN 201711243982A CN 107931554 B CN107931554 B CN 107931554B
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- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/163—Controlling or regulating processes or operations for cutting cast stock
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Abstract
The application discloses a continuous casting billet positioning calculation method, which comprises the following steps: acquiring and transmitting the instantaneous speed of a frequency converter of the withdrawal and straightening machine in real time; setting a fixed sampling period in a control system of a continuous casting machine, and calculating a rotation angle of the fixed sampling period of a withdrawal and straightening machine motor according to the instantaneous speed and the fixed sampling period; calculating the displacement of the fixed sampling period of the casting blank according to the rotation angle of the fixed sampling period of the motor of the withdrawal and straightening machine; and accumulating the displacement of the fixed sampling period of the casting blank to obtain the displacement of the casting blank, and obtaining the coordinate of the casting blank according to the displacement of the casting blank. According to the method, the investment of measuring equipment such as an encoder and a control template is not needed, a control system of the continuous casting machine can calculate and obtain the casting blank coordinate according to the acquired parameters such as the instantaneous speed of a frequency converter of the withdrawal and straightening machine, the fixed sampling period and the like, the calculation precision of the method is stable, the requirements of casting blank tracking and fixed-length cutting are completely met, and the fault rate is zero; the application effect meets the production requirement, reduces the equipment maintenance amount and further reduces the labor intensity of maintenance personnel.
Description
Technical Field
The application relates to the technical field of automatic control, in particular to a continuous casting billet positioning calculation method.
Background
The molten steel smelted in the steelmaking process is continuously cast into a casting blank by a continuous casting machine, and the casting blank is straightened by a straightening machine, sized on a roller way and cut into a casting blank with a certain length by a cutting machine according to the requirements of the next process. In the casting production process of the continuous casting machine, secondary cooling water distribution, casting blank pressure conversion of a withdrawal and straightening machine, withdrawal and straightening roller lifting and pressing, dummy ingot conveying, cut-to-length cutting of a flame cutting machine and other equipment actions need to be controlled according to the position of a casting blank head of the casting blank, and the production of the continuous casting machine is seriously influenced by inaccurate positioning coordinates or non-counting of the continuous casting blank.
In the prior art, a counting encoder is generally installed on a motor shaft of a withdrawal and straightening machine of a continuous casting machine, the motor drives a casting blank to travel through a speed reducer and a withdrawal and straightening roller, the counting encoder collects the rotation angle and the rotation number of turns of the motor shaft, and then the position of the casting blank is calculated according to the rotation angle and the rotation number of turns of the motor shaft of the withdrawal and straightening machine, so that the casting blank is positioned.
However, during the production of casting blanks, the temperature of the withdrawal and straightening unit is very high, so that the frequent failure of a counting encoder is easily caused, and the production of a continuous casting machine is severely restricted. Meanwhile, the encoder is installed in the withdrawal and straightening machine, so that the installation and maintenance difficulty is high.
Disclosure of Invention
The application provides a continuous casting positioning calculation method, which aims to solve the technical problems that the positioning of the existing continuous casting depends on an encoder, and the encoder is easy to break down in a complex environment.
In order to solve the technical problem, the embodiment of the application discloses the following technical scheme:
the embodiment of the application discloses a continuous casting billet positioning calculation method, which comprises the following steps:
acquiring and transmitting the instantaneous speed of a frequency converter of the withdrawal and straightening machine in real time;
setting a fixed sampling period in a control system of a continuous casting machine, and calculating a rotation angle of the fixed sampling period of a withdrawal and straightening machine motor according to the instantaneous speed and the fixed sampling period;
calculating the displacement of the fixed sampling period of the casting blank according to the rotation angle of the fixed sampling period of the motor of the withdrawal and straightening machine;
and accumulating the displacement of the fixed sampling period of the casting blank to obtain the displacement of the casting blank, and obtaining the coordinate of the casting blank according to the displacement of the casting blank.
Optionally, the acquiring and transmitting the instantaneous speed of the frequency converter of the withdrawal and straightening unit in real time includes:
the control system of the continuous casting machine is in communication connection with the frequency converter of the withdrawal and straightening machine;
and transmitting the acquired instantaneous speed of the frequency converter of the withdrawal and straightening unit to the control system of the continuous casting machine.
Optionally, the instantaneous speed of the frequency converter of the withdrawal and straightening unit is transmitted to the control system of the continuous casting machine through an industrial ethernet, a field bus or an analog signal.
Optionally, the calculating a fixed sampling rotation angle of the withdrawal and straightening unit motor according to the instantaneous speed and the fixed sampling period includes:
the continuous casting machine control system receives the instantaneous speed of the withdrawal and straightening machine frequency converter;
and calculating to obtain the fixed sampling rotation angle of the motor of the withdrawal and straightening machine according to the following formula.
And fixing a sampling rotation angle of the motor of the tension leveler, namely the instantaneous speed of the frequency converter of the tension leveler, and sampling period and correction coefficient.
Optionally, calculating a casting blank fixed sampling period displacement according to the fixed sampling period rotation angle of the withdrawal and straightening unit motor includes:
the continuous casting machine control system calculates the displacement of the fixed sampling period of the casting blank according to the following formula;
and (3) casting blank fixed sampling period displacement, namely fixed sampling period rotation angle of a motor of the withdrawal and straightening machine, and motor reduction ratio, namely withdrawal and straightening roller perimeter, and correction coefficient.
Optionally, the obtaining of the casting blank displacement by accumulating the displacement of the casting blank fixed sampling period includes:
transmitting the fixed sampling period displacement of the casting blank to the control system of the continuous casting machine;
and the continuous casting machine control system carries out accumulation calculation on the received displacement of the fixed sampling period to obtain the casting blank displacement.
Optionally, obtaining a casting blank coordinate according to the casting blank displacement includes:
when the continuous casting machine is started, the continuous casting crystallizer is used as a coordinate zero point, and the casting blank displacement is the casting blank head coordinate.
Compared with the prior art, the beneficial effect of this application is:
the continuous casting billet positioning calculation method provided by the embodiment of the application comprises the following steps: acquiring and transmitting the instantaneous speed of a frequency converter of the withdrawal and straightening machine in real time; setting a fixed sampling period in a control system of a continuous casting machine, and calculating a rotation angle of the fixed sampling period of a withdrawal and straightening machine motor according to the instantaneous speed and the fixed sampling period; calculating the displacement of the fixed sampling period of the casting blank according to the rotation angle of the fixed sampling period of the motor of the withdrawal and straightening machine; and accumulating the displacement of the fixed sampling period of the casting blank to obtain the displacement of the casting blank, and obtaining the coordinate of the casting blank according to the displacement of the casting blank. The continuous casting billet positioning calculation method is simple, reliable and novel, investment of measuring equipment such as an encoder and a control template is not needed, a continuous casting machine control system can calculate and obtain casting billet coordinates according to parameters such as the acquired instantaneous speed of a frequency converter of a withdrawal and straightening machine and a fixed sampling period, the accuracy of a result obtained by the positioning calculation method is stable, the requirements of casting billet tracking and fixed-length cutting can be completely met, and the fault rate is zero; the application effect meets the production requirement, the equipment maintenance amount can be reduced, and the labor intensity of maintenance personnel can be reduced.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a continuous casting billet positioning calculation method according to an embodiment of the present invention;
FIG. 2 is a schematic block diagram of a method for calculating a continuous casting slab positioning according to an embodiment of the present invention;
fig. 3 is one of the cut-to-length application interfaces in the continuous casting slab positioning calculation method according to the embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, a flowchart of a continuous casting billet positioning calculation method according to an embodiment of the present invention is provided.
As shown in fig. 1, a method for calculating a slab positioning according to an embodiment of the present invention includes:
s100: and acquiring and transmitting the instantaneous speed of the frequency converter of the withdrawal and straightening machine in real time.
The tension leveler has the function of ensuring the stretching and straightening of the hot billet in the processes of inserting the dummy bar and casting, is driven by the motor and is subjected to frequency conversion and speed regulation by the frequency converter, and the frequency converter of the tension leveler changes the voltage of the motor of the tension leveler by changing the frequency so as to change the rotating speed of a motor shaft. Therefore, the instantaneous speed of the frequency converter of the withdrawal and straightening machine can be acquired and transmitted in real time through the speed sensor, and the acquired instantaneous speed is transmitted to the control system of the continuous casting machine for processing.
Specifically, the frequency converter of the withdrawal and straightening unit is in communication connection with a control system of the continuous casting machine, is transmitted to the control system of the continuous casting machine through an industrial Ethernet or a field bus or an analog signal, and is stored in a data block of the control system of the continuous casting machine for subsequent use.
If the continuous casting machine adopts a multi-frame withdrawal and straightening machine driving mode, the speed feedback of a horizontal section withdrawal and straightening machine is generally collected, and meanwhile, the speed feedback of a plurality of withdrawal and straightening machines can be collected to serve as the backup calculation data, so that the casting blank positioning is prevented from being influenced when a single withdrawal and straightening machine breaks down.
S200: and setting a fixed sampling period in a control system of the continuous casting machine, and calculating a rotation angle of the fixed sampling period of the withdrawal and straightening machine motor according to the instantaneous speed and the fixed sampling period.
Manually setting a fixed sampling period in a control system of a continuous casting machine, acquiring the instantaneous speed of a frequency converter of the withdrawal and straightening machine once in each fixed sampling period, and calculating the rotation angle of the fixed sampling period of a motor of the withdrawal and straightening machine according to a formula, wherein the formula is as follows:
correcting coefficient of fixed sampling rotation angle of motor of withdrawal straightening machine, namely instantaneous speed of transducer of withdrawal straightening machine, sampling period
The shorter the sampling period, the more accurate the corresponding calculation data, as allowed by the control system hardware conditions.
S300: and calculating the displacement of the fixed sampling period of the casting blank according to the rotation angle of the fixed sampling period of the motor of the withdrawal and straightening machine.
Because the withdrawal and straightening machine is the main driving device of the continuous casting billet, the casting billet is tightly clamped and pulled out through the speed reducer and the withdrawal and straightening roller, so that the displacement of the fixed sampling period of the casting billet can be calculated through the rotation angle of the fixed sampling period of the motor of the withdrawal and straightening machine on the premise of no slipping between the withdrawal and straightening machine and the casting billet, and the calculation formula is as follows:
and (3) casting blank fixed sampling period displacement, namely fixed sampling period rotation angle of a motor of the withdrawal and straightening machine, and motor reduction ratio, namely withdrawal and straightening roller perimeter, and correction coefficient.
S400: and accumulating the displacement of the fixed sampling period of the casting blank to obtain the displacement of the casting blank, and obtaining the coordinate of the casting blank according to the displacement of the casting blank.
And accumulating the calculated displacement of the casting blank in the fixed sampling period by the control system of the continuous casting machine to obtain the displacement of the casting blank corresponding to all the sampling periods. When the continuous casting machine is started, the continuous casting crystallizer is used as a coordinate zero point, and the head coordinate of the casting blank can be obtained according to the displacement of the casting blank, so that the coordinate positioning and tracking of the casting blank in the production of the continuous casting machine are realized.
The casting blank coordinate is obtained and then stored in a data block of a continuous casting machine control system, so that the continuous casting machine control system can conveniently transmit the casting blank coordinate data to each control subsystem of dynamic secondary cooling water distribution, tension leveler casting blank pressure conversion, tension leveler roller lifting and pressing, dummy ingot conveying, flame cutting machine sizing and cutting, casting blank coordinate zero clearing conditions and correction coefficients are set according to the control requirements of each system, and a corresponding control interface is established.
As shown in fig. 2, when the continuous casting positioning calculation method provided by the embodiment of the present invention is applied to continuous casting production, a fixed sampling period is manually set in a continuous casting machine control system, and the continuous casting machine control system is in communication connection with a withdrawal and straightening unit frequency converter (implemented by using various manners such as an industrial ethernet, a field bus, and analog quantity signal input/output); then, acquiring and transmitting the instantaneous speed of a frequency converter of the withdrawal and straightening machine in real time in a fixed sampling period, and transmitting the instantaneous speed to a continuous casting machine control system, wherein the continuous casting machine control system calculates the rotation angle of the fixed sampling period of the motor of the withdrawal and straightening machine according to the instantaneous speed and the fixed sampling period; then the continuous casting machine control system calculates the displacement of the fixed sampling period of the casting blank according to the rotation angle of the fixed sampling period of the withdrawal and straightening machine motor; then accumulating the displacement of the casting blank in a fixed sampling period by a continuous casting machine control system, and calculating to obtain the displacement of the casting blank; then obtaining a casting blank coordinate according to the displacement of the casting blank; and finally, transmitting the casting blank coordinates to control subsystems such as a dynamic secondary cooling water distribution subsystem, a straightening roll control subsystem, a dummy ingot feeding control subsystem and a flame cutting machine sizing subsystem, and performing corresponding actions by the control subsystems such as the dynamic secondary cooling water distribution subsystem, the straightening roll control subsystem, the dummy ingot feeding control subsystem and the flame cutting machine sizing subsystem according to the casting blank coordinates.
In control systems such as dynamic secondary cooling water distribution, casting blank pressure conversion of a withdrawal and straightening machine, withdrawal and straightening roller lifting and reduction and the like, only real-time data of casting blank coordinates are needed. In the dummy ingot feeding control system, it is necessary to establish a coordinate initialization condition, set an initial coordinate, and the like.
In a fixed-length cutting system of a flame cutting machine, the fixed-length, the pre-clamping length, the correction coefficient and the fixed-length zero clearing condition need to be determined firstly, and the control interface is shown in figure 3; and calculating the action condition of the fire cutter device according to the casting blank positioning coordinates to control the continuous casting blank cut-to-length operation.
The continuous casting billet positioning calculation method provided by the embodiment of the application comprises the following steps: acquiring and transmitting the instantaneous speed of a frequency converter of the withdrawal and straightening machine in real time; setting a fixed sampling period in a continuous casting machine control system in the continuous casting machine control system, and calculating by the continuous casting machine control system according to the received instantaneous speed and sampling period of a withdrawal and straightening machine frequency converter to obtain a fixed sampling period rotating angle of a withdrawal and straightening machine motor; the continuous casting machine control system calculates to obtain the fixed sampling period displacement of the casting blank according to the fixed sampling period rotation angle of the withdrawal and straightening machine motor; and the continuous casting machine control system carries out accumulated calculation on the displacement of the fixed sampling period of the casting blank to obtain the displacement of the casting blank, and obtains the coordinates of the casting blank according to the displacement of the casting blank. The continuous casting billet positioning calculation method is simple, reliable and novel, investment of measuring equipment such as an encoder and a control template is not needed, and the casting billet coordinates can be calculated only by a continuous casting machine control system according to parameters such as the instantaneous speed and the sampling period of a frequency converter of a withdrawal and straightening machine; after the continuous casting billet positioning calculation method is used, under the condition of stable continuous casting billet pulling speed production, the calculation precision of the casting billet tracking coordinate is stable, the requirements of casting billet tracking and fixed-length cutting are completely met, and the fault rate is zero; in addition, the application effect meets the production requirement, the equipment maintenance amount is reduced, and the labor intensity of maintenance personnel is further reduced.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
The above-described embodiments of the present application do not limit the scope of the present application.
Claims (5)
1. A continuous casting billet positioning calculation method is characterized by comprising the following steps:
acquiring and transmitting the instantaneous speed of a frequency converter of the withdrawal and straightening machine in real time;
setting a fixed sampling period in a control system of a continuous casting machine, and calculating a rotation angle of the fixed sampling period of a withdrawal and straightening machine motor according to the instantaneous speed and the fixed sampling period;
calculating the displacement of the fixed sampling period of the casting blank according to the rotation angle of the fixed sampling period of the motor of the withdrawal and straightening machine;
transmitting the fixed sampling period displacement of the casting blank to the control system of the continuous casting machine;
the continuous casting machine control system carries out accumulation calculation on the received displacement of the fixed sampling period to obtain the displacement of the casting blank;
when the continuous casting machine is started, the continuous casting crystallizer is used as a coordinate zero point, and the casting blank displacement is the casting blank head coordinate.
2. The method as claimed in claim 1, wherein the real-time collecting and transmitting the instantaneous speed of the frequency converter of the withdrawal and straightening unit comprises:
the control system of the continuous casting machine is in communication connection with the frequency converter of the withdrawal and straightening machine;
and transmitting the acquired instantaneous speed of the frequency converter of the withdrawal and straightening unit to the control system of the continuous casting machine.
3. The method as claimed in claim 2, characterized in that the instantaneous speed of the withdrawal and straightening unit frequency converter is transmitted to the continuous casting machine control system via an industrial ethernet or fieldbus or an analog signal.
4. The method as claimed in claim 1, wherein the calculating of the fixed sampling rotation angle of the withdrawal and straightening unit motor according to the instantaneous speed and the fixed sampling period comprises:
the continuous casting machine control system receives the instantaneous speed of the withdrawal and straightening machine frequency converter;
calculating to obtain a fixed sampling rotation angle of a motor of the withdrawal and straightening machine according to the following formula;
and fixing a sampling rotation angle of the motor of the tension leveler, namely the instantaneous speed of the frequency converter of the tension leveler, and sampling period and correction coefficient.
5. The method according to claim 1, wherein the calculating a casting blank fixed sampling period displacement according to the fixed sampling period rotation angle of the withdrawal and straightening unit motor comprises:
the continuous casting machine control system calculates the displacement of the fixed sampling period of the casting blank according to the following formula;
and (3) casting blank fixed sampling period displacement, namely fixed sampling period rotation angle of a motor of the withdrawal and straightening machine, and motor reduction ratio, namely withdrawal and straightening roller perimeter, and correction coefficient.
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| CN111531143A (en) * | 2020-05-29 | 2020-08-14 | 山东莱钢永锋钢铁有限公司 | Continuous casting machine system |
| CN115338382B (en) * | 2022-08-12 | 2023-06-27 | 宝武集团鄂城钢铁有限公司 | Continuous casting billet head position analysis method and related equipment |
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| EP1707290B1 (en) * | 2003-11-27 | 2010-02-10 | JFE Steel Corporation | Method for detecting solidification completion position of continuous casting cast piece, detector, and method for producing continuous casting cast piece |
| DE102005026259A1 (en) * | 2005-06-08 | 2006-12-14 | Sms Demag Ag | Method and apparatus for continuous casting of liquid metals, in particular of liquid steel materials, with a strand guide of support roller segments |
| CN102921911A (en) * | 2012-10-30 | 2013-02-13 | 鞍钢股份有限公司 | Method for tracking continuous casting flow and marking quality event |
| CN105328154B (en) * | 2015-11-11 | 2018-03-13 | 北京首钢股份有限公司 | A kind of strand cutting localization method and system |
| CN105710323B (en) * | 2016-02-16 | 2018-01-02 | 山信软件股份有限公司 | A kind of slab scale surveys long method and system |
| CN105665673B (en) * | 2016-02-26 | 2018-03-09 | 山东钢铁股份有限公司 | A kind of continuous-cast blank method for scaling and system |
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