Continuous casting machine terminal roller way casting blank temperature measuring method

Abstract

The invention relates to the technical field of casting blank temperature measurement, in particular to a continuous casting machine terminal roller way casting blank temperature measurement method, which adopts an infrared temperature measurement probe to carry out temperature measurement on a cutting section of a casting blank on a terminal roller way, accesses an analog quantity signal of casting blank temperature measurement into a main PLC (Programmable Logic Controller), and adopts a program to set a shunting mark position; when the steel hooking machine runs to a casting blank of a corresponding flow, marking a flow division serial number; and when the small cooling bed pushes the casting blank to the temperature measuring position of the infrared temperature measuring probe, the measured temperature is associated with the flow dividing mark position, and the temperature of the multi-flow casting blank is measured by the single infrared temperature measuring probe. The infrared temperature measurement probe is used for measuring the temperature of the cutting section of the casting blank on the terminal roller way, the situation that the measured temperature is inaccurate due to air convection and oxide scale on the outer surface of the steel blank is avoided, and the temperature measurement value is relatively stable and accurate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of casting blank temperature measurement, in particular to a continuous casting machine terminal roller bed casting blank temperature measurement method. BACKGROUND

[0002] The casting blank on the terminal roller bed is originally measured by manual operation. The temperature measurement method has no benchmark, and the incident angle of each steel temperature measurement is not unified. The temperature measured by the casting blank on the terminal roller bed cannot explain its accuracy. Secondly, manual measurement is interval measurement, which cannot guarantee the continuity of the casting blank temperature measurement, and causes great difficulty in checking the original temperature of the casting blank and judging whether the casting blank is qualified.

[0003] After producing special steel, especially after producing hot blank directly entering the next process, a new challenge is brought to the casting blank temperature measurement link. First, the frequency of temperature measurement of the on-site operator is increased, and the work intensity of the on-site operator is increased. Secondly, in order to ensure that the casting blank entering the next process is maintained at 600 degrees Celsius or above, the technical requirements of the temperature measurement link are also improved. Based on this, the present application provides a continuous casting machine terminal roller bed casting blank temperature measurement method. SUMMARY

[0004] The present application overcomes the shortcomings of the prior art and provides a continuous casting machine terminal roller bed casting blank temperature measurement method. The cutting section of the casting blank on the terminal roller bed is measured by using an infrared temperature measurement probe, so as to avoid the inaccurate measurement caused by air convection and iron oxide skin on the surface of the steel blank, and the temperature measurement value is relatively stable and accurate.

[0005] The continuous casting machine terminal roller bed casting blank temperature measurement method provided by the present application specifically includes the following steps: S1, using an infrared temperature measurement probe to measure the temperature of the cutting section of the casting blank on the terminal roller bed; S2, connecting the analog signal of the casting blank temperature measurement to the main PLC; S3, using a program to set a shunt mark bit, when the steel hooking machine runs to the corresponding flow of the casting blank, the shunt serial number is marked; when the small cooling bed pushes the casting blank to the temperature measurement position of the infrared temperature measurement probe, the measured temperature is associated with the shunt mark bit, so as to realize the temperature measurement of multiple flow casting blanks by a single infrared temperature measurement probe.

[0006] Further, the S1 specifically includes installing the infrared temperature measurement probe on the limiting support bracket of the terminal roller bed small cooling bed area, adjusting the position of the bracket and the infrared temperature measurement probe, so that the infrared temperature measurement probe is directly opposite to the end face of the casting blank on the terminal roller bed, and the temperature measurement incident angle is constant, and the temperature of the cutting section of the casting blank on the terminal roller bed is measured by using the infrared temperature measurement probe.

[0007] Further, when the infrared temperature measuring probe is used to measure the temperature of the cutting section of the casting blank on the terminal roller, the temperature is used to calibrate the temperature measuring system, the temperature measuring refractive index is determined to be 0.76, the temperature measured by the infrared temperature measuring probe on site is divided by 0.76, and the actual temperature of the casting blank is obtained.

[0008] Further, the S2 specifically includes that the output signal line and the power line of the infrared temperature measuring probe are introduced into the on-site transition box of the terminal area hook steel machine through the bridge, the signal isolation grid is connected in the transition box to maintain the strength of the analog signal, the probe analog signal is connected through the preset standby cable in the transition box, is introduced into the under-table operation group through the underground bridge, and is connected to the signal isolation grid, and the analog quantity of the casting blank temperature is connected to the PLC of the casting blank weighing, the analog signal of the casting blank temperature is transmitted to the main PLC of the continuous casting machine through the communication between the PLC of the casting blank weighing and the main PLC of the continuous casting machine.

[0009] Further, the analog signal received in the main PLC of the continuous casting machine is generated on the man-machine interface to generate a historical trend, and the analog points of the casting blank temperature are uploaded to the EMS, and the real-time temperature is checked by the downstream production unit through the secondary network.

[0010] Further, the temperature measuring range of the infrared temperature measuring probe is 0-1000 degrees Celsius.

[0011] The beneficial effects of the present application are: (1) The continuous casting machine terminal roller casting blank temperature measuring method adopts the infrared temperature measuring probe to measure the temperature of the cutting section of the casting blank on the terminal roller, avoids the inaccurate measurement of the temperature caused by the air convection and the iron oxide skin existing on the surface of the steel blank, and the temperature measuring value is relatively stable and accurate; on the basis of the original manual temperature measurement, an automatic temperature measuring system is added, after temperature measurement, the temperature is automatically uploaded to the secondary network, automatically displayed on the man-machine interface, and the temperature record can be checked, and the measured temperature can also be recorded separately according to the shunt.

[0012] (2) The present application can realize the function of measuring the temperature of multiple casting streams by a temperature measuring probe by setting a mark for each flow, and gradually converting the voltage signal of the temperature measurement into a digital signal of the casting machine PLC through the construction of the analog signal channel, so as to facilitate calculation, recording, display and sharing. DETAILED DESCRIPTION

[0013] The continuous casting machine terminal roller casting blank temperature measuring method provided by the present application specifically includes the following steps: After many experiments, it is found that the non-contact temperature measuring device is not only lower, but also unstable when measuring the temperature of the billet side, because the billet surface is covered with uneven iron oxide scale, and the influence of thermal convection on the billet surface is more obvious. When measuring the temperature of the cutting section, the end surface of the billet has less iron oxide scale, and the thermal convection is relatively stable, so the measured result is closer to the actual temperature and relatively stable. Therefore, the temperature measuring probe is installed at the tail of the billet terminal. At the same time, the temperature of the billet is measured by a contact type temperature measuring instrument. After the temperature measuring system is complete, the temperature measured by the contact type instrument is used to calibrate the temperature measuring system. The actual experiment shows that the temperature measuring refractive index is 0.76, that is, the temperature measured on site is consistent with the result measured by the contact type instrument after being divided by the coefficient 0.76.

[0014] A limiting support bracket is welded in the terminal roller table small cooling bed area. After the bracket is fixed, an infrared temperature measuring probe (0-1000 degrees Celsius) is installed on the bracket. The position of the bracket and the temperature measuring probe is adjusted so that it is directly opposite to the end surface of the billet on the terminal roller table. The temperature measuring incident angle is kept constant, and the vibration of the billet hooking machine during movement is avoided to affect the position of the probe.

[0015] The output signal line and the power line of the infrared temperature measuring probe are led into the terminal area billet hooking machine field transition box. In the transition box, a signal isolation grid is connected to maintain the strength of the analog signal. Two spare cables originally placed in the billet hooking machine intermediate transition box are connected to the probe analog signal. The cables are led into the underfloor operation group through the underground bridge and connected to the signal isolation grid to enhance the signal strength.

[0016] The input analog point left in the PLC of the billet weighing project is used to connect the billet temperature measuring analog quantity to the PLC of the billet weighing.

[0017] The billet temperature measuring analog signal is transmitted to the main PLC of the 4# continuous casting machine through the communication between the PLC of the billet weighing and the main PLC.

[0018] The analog signal point transmitted from the main PLC of the 4# continuous casting machine is used to make a historical trend on the human-machine interface for easy viewing by Intouch.

[0019] The billet temperature measuring analog point is uploaded to EMS through the secondary network, which is convenient for downstream production units to check, so that other factories can also see the real-time temperature of the billet temperature measuring of the 4# continuous casting machine of our factory.

[0020] A shunt marking bit is set in the program. When the billet hooking machine runs to the billet of the shunt, the shunt serial number is marked. When the billet is pushed to the position of the temperature measuring probe by the small cooling bed, the measured temperature is associated with the shunt mark, so that one probe can be used to measure the temperature of the billets of five flows.

[0021] It can be understood that the application increases the automatic temperature measurement system on the basis of the original artificial temperature measurement. After temperature measurement, it is automatically uploaded to the secondary network, automatically displayed on the man-machine interface, and the temperature record can be checked. At the same time, the measured temperature can also be recorded separately according to the shunt.

[0022] And through many experiments, it is found that when measuring the surface temperature of the casting blank, there is air convection and iron oxide scale on the outer surface of the steel blank, the measured temperature is inaccurate, and the end part has less iron oxide scale and uniform thickness, and the direction of air convection has less effect on temperature measurement, so the temperature measurement value is relatively stable, and is stabilized at the refractive index of 0.76.

[0023] The temperature measurement system of the continuous casting machine terminal roller is increased, and in particular, when the temperature measurement probe is placed on the steel hooking machine, through program setting, a mark position is added to each flow, so that the function of measuring the temperature of multiple casting flows by one temperature measurement probe can be realized.

[0024] By constructing the analog signal channel, the voltage signal of temperature measurement is gradually converted into the digital signal of the continuous casting machine PLC, so as to facilitate calculation, recording, display and sharing, and to ensure that the on-site operator can clearly see the temperature of the casting blank, which provides a reference for the temperature measurement system of other continuous casting machines in the later period.

[0025] In addition to the above embodiments, the application can also have other implementation manners. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the application.

Claims

1. A method for measuring the temperature of billet cast on the terminal roller conveyor of a continuous casting machine, characterized in that, Includes the following steps: S1. Use an infrared temperature probe to measure the temperature of the cut surface of the billet on the terminal roller conveyor. S2. Connect the analog signal of the billet temperature measurement to the main PLC; S3. The flow diversion mark is set by program. When the steel hook machine runs to the corresponding flow of billet, the flow diversion sequence number is marked. When the small cooling bed pushes the billet to the temperature measurement position of the infrared temperature probe, the measured temperature is associated with the shunt marker, so as to realize the temperature measurement of multi-flow billet by a single infrared temperature probe.

2. The method for measuring the temperature of the billet at the terminal roller table of a continuous casting machine according to claim 1, characterized in that, S1 specifically includes installing the infrared temperature measuring probe on the limiting support bracket in the small cooling bed area of ​​the terminal roller conveyor, adjusting the position of the bracket and the infrared temperature measuring probe so that the infrared temperature measuring probe is facing the end face of the casting billet on the terminal roller conveyor, and ensuring that the temperature measurement incident angle is constant, and using the infrared temperature measuring probe to measure the temperature of the cut surface of the casting billet on the terminal roller conveyor.

3. The method for measuring the temperature of the billet on the terminal roller conveyor of a continuous casting machine according to claim 2, characterized in that, When using an infrared temperature probe to measure the temperature of the cut surface of the billet on the terminal roller conveyor, the temperature is used to calibrate the temperature measurement system. The refractive index of the temperature measurement is determined to be 0.

76. The actual temperature of the billet is obtained by dividing the temperature measured by the infrared temperature probe on site by 0.

76.

4. The method for measuring the temperature of the billet on the terminal roller conveyor of a continuous casting machine according to claim 1, characterized in that, S2 specifically includes introducing the output signal line and power line of the infrared temperature measurement probe into the on-site transition box of the hook steel machine in the terminal area via a cable tray. A signal isolation barrier is connected in the transition box to maintain the analog signal strength. The analog signal of the probe is connected through a spare cable preset in the transition box, introduced into the operating group under the platform via a tunnel cable tray and connected to the signal isolation barrier. Then, the analog signal of the billet temperature measurement is connected to the billet weighing PLC. Through the communication between the billet weighing PLC and the main PLC of the continuous casting machine, the analog signal of the billet temperature measurement is transmitted to the main PLC of the continuous casting machine.

5. The method for measuring the temperature of the billet on the terminal roller conveyor of a continuous casting machine according to claim 1, characterized in that, Also includes: The analog signals received by the main PLC of the continuous casting machine are used to generate historical trends on the human-machine interface; and the analog temperature points of the billet are uploaded to the EMS, so that downstream production units can view the real-time temperature through the secondary network.

6. The method for measuring the temperature of the billet on the terminal roller conveyor of a continuous casting machine according to claim 1, characterized in that, The infrared temperature measuring probe has a temperature measurement range of 0-1000 degrees Celsius.