TWI404928B - Continuous casting of water mist ultrasonic detection method - Google Patents

Abstract

The invention provides a water mist ultrasonic wave detection method for continuous casting. The water mist ultrasonic wave detection method for continuous casting comprises: (a) supplying at least one ultrasonic device for generating an ultrasonic wave that touches a water mist to form a reflective wave signal; (b) capturing the reflective wave signal and; and (c) obtaining the information on the water mist condition based on the collected reflective wave signal. This invention utilizes the ultrasonic device to directly detect the strength and flow amount of the water mist, without having to use a thin film sensor like that in prior art. Therefore, it does not have to face sensor deterioration problem and is more sensitive to low flow water mist detection work. Finally, the water mist ultrasonic wave detection method can also be applied in detecting residue accumulated on the surface of a roller wheel. Thus, abrasion of steel strand can be avoided if the accumulated residue is removed before any harm is done.

Description

Continuous fog casting water mist ultrasonic detection method

The invention relates to a water mist detecting method, in particular to a continuous casting water mist ultrasonic detecting method.

Commonly known methods for detecting water mist ultrasonic waves include: acoustic vibration sensing, acceleration gauge force sensing, and strain gauge deformation sensing. The above three conventional methods for detecting ultrasonic mist are provided by providing a sensing film between the nozzle and the sensor to sense the sound wave vibration or deformation caused by the water mist impact, and indirectly detecting the water mist. status.

Figure 1 shows a schematic diagram of a conventional water mist ultrasonic detecting device. The conventional water mist ultrasonic detecting device 1 includes a sensing film 11 and a sensor 12 (acoustic sensor, accelerometer or strain gauge). The sensing film 11 is disposed on the sensor 12 . The water spray is emitted from the nozzle 13 disposed above the sensing film 11 and impacts the sensing film 11. The sensing film 11 is vibrated or deformed by the impact of the water mist, and the sensor 12 is The vibration or deformation of the sensing film 11 is received to indirectly detect the state of the water mist (for example, the intensity of the water mist).

However, limited by the sensitivity of the sensor 12 and the intensity and aging factor of the sensing film 11, the conventional water mist ultrasonic detecting device 1 is less sensitive to the detection of a smaller flow water mist. Inaccurate. In addition, in the continuous casting process, the conventional water mist ultrasonic detecting device 1 cannot detect the slag on the surface of the roller, and therefore, the problem that the slag scratches the steel blank cannot be avoided.

Therefore, it is necessary to provide an innovative and progressive continuous casting water mist ultrasonic detection method to solve the above problems.

The invention provides a continuous casting water mist ultrasonic detecting method, wherein the continuous casting water mist ultrasonic detecting method comprises: (a) providing at least one ultrasonic device for generating an ultrasonic wave, the ultrasonic wave contacting the ultrasonic wave The water mist forms a reflected wave signal; (b) extracts the reflected wave signal; and (c) obtains the state information of the water mist according to the reflected wave signal.

The present invention utilizes the ultrasonic devices to directly detect the intensity and flow rate information of the water mist, without the need for a sensing film to detect the intensity and flow information of the water mist as in the prior art, so that there is no sensor The problem of aging, and the detection of small flow water mist is more sensitive. Furthermore, the continuous casting water mist ultrasonic detecting method of the present invention can also detect the slag formed on the surface of the roller, so that the slag can be removed early to avoid scratching the steel blank.

2 is a flow chart showing a method for detecting a water mist ultrasonic wave in the continuous casting of the present invention; and FIG. 3 is a view showing a water mist ultrasonic wave detecting method in the continuous casting process of the present invention. The continuous casting process is carried out in a continuous casting apparatus comprising a copper die 2, a dummy bar 3, a plurality of pairs of rollers 5 and at least one nozzle 6. The casting rod 3 can enter between the copper mold 2 and the pair of rollers 5, and the nozzle 6 is disposed between the adjacent roller pairs 5 and located at one side of the casting rod 3.

Wherein, in the continuous casting process, the copper mold 2 is provided with a molten steel 4, the open casting rod 3 guides the molten steel 4 out of the copper mold 2 at a moving speed, and the open casting rod 3 passes through A plurality of pairs of rollers 5 between. After being cooled by heat extraction, the surface of the molten steel 4 that is guided out starts to cool and solidifies to form a crust, and then enters secondary cooling. The zone passes through at least one nozzle 6 disposed between the rollers 5 (the nozzles 6 are disposed between adjacent rollers 5, and only two nozzles 6 are shown in FIG. 3 as an example) to spray water (fog) The shell and the molten steel 4 are cooled to form a fully solidified steel preform.

Referring to FIG. 2 and FIG. 3, first, referring to step S21, at least one ultrasonic device is provided, and the ultrasonic device is fixed on the open casting rod 3 and is located on the same side of the open casting rod 3 as the water. The mist is ejected by the nozzle 6 to the ultrasonic device. In the present embodiment, two ultrasonic devices 7 are used, but are not limited to two ultrasonic devices, and more ultrasonic devices can be used depending on the application. The ultrasonic devices 7 are respectively disposed on two sides of the open casting rod 3 for generating an ultrasonic wave. The ultrasonic device 7 and the open casting rod 3 have the same moving speed. When the ultrasonic wave contacts the water mist, the ultrasonic wave is reflected by the water mist to form a reflected wave signal.

Referring to step S22, the reflected wave signal is captured. In this embodiment, the ultrasonic wave device 7 captures the reflected wave signal, and outputs the reflected wave signal to a signal processing device (not shown), for example, a computer, and then takes the captured signal. The reflected wave signal is converted into an analog signal (for example, voltage), and the voltage signal is also stored and analyzed by the processing device. It should be noted that the reflected wave signal is not limited to being converted into an analog signal.

Referring to step S23, the state information of the water mist is obtained according to the reflected wave signal. The water mist state data includes at least one of the water mist intensity and flow information.

In the present embodiment, in steps S21 to S23, a step of calculating the position of the ultrasonic device 7 is further included. Wherein, in the step of calculating the position of the ultrasonic device 7, the ultrasonic device 7 disposed on the open casting rod 3 is from a pair of rollers 5 A moving speed is moved to the other pair of rollers 5, which lasts for a time. Finally, the position of the ultrasonic device 7 is calculated based on the moving speed of the ultrasonic device 7 and the moving time.

It should be noted that in the continuous casting process, if the surface of the roller 5 has slag 8, the ultrasonic waves generated by the ultrasonic devices 7 will also contact the slag 8, so the reflected wave of the ultrasonic wave The signal also contains information about the slag 8. In addition, with the calculated position of the ultrasonic device 7, it can be detected at which position the slag 8 is formed on the surface of the roller 5 as an early warning, so that the operator can clear the slag 8 as soon as possible. Avoid scratching the steel embryo.

4 is a diagram showing the relationship between the intensity of the water mist intensity-reflected wave signal output signal of the present invention; FIG. 5 is a view showing the positional relationship of the output signal intensity-ultrasonic device of the reflected wave signal using the first type of nozzle of the present invention; The reflected signal of the second type of nozzle is used to output the signal intensity-supersonic device positional relationship diagram.

Referring to Figure 4, it is shown that the intensity of the reflected wave signal output signal is inversely proportional to the water mist intensity. It can be seen from the relationship between the intensity of the reflected wave signal output signal and the water mist intensity that the peak portion in FIG. 5 and FIG. 6 is the anhydrous mist region, and the valley portion is the water mist region. In addition, the state of the water mist (including the intensity of the water mist and the flow rate information) can be known from the waveform change of the water mist region (ie, the voltage of the ultrasonic output signal).

In the waveforms of the reflected wave signal output signals in FIG. 5 and FIG. 6, the signal intensity on the two sides of the peak portion is not attenuated, and the surface of the roller has no slag; on the contrary, if the waveform of the reflected wave signal is output, The signal intensity on the two sides of the peak portion is attenuated, which indicates that slag is formed on the surface of the roller.

The invention directly detects the intensity and flow of the water mist by using the ultrasonic device 7 Information, without the need to use a sensing film to detect the intensity and flow information of the water mist, so there is no problem of sensor aging, and it is sensitive to the detection of small flow water mist. Furthermore, the continuous casting water mist ultrasonic detecting method of the present invention can also detect the slag 8 formed on the surface of the roller 5, so that the slag 8 can be removed early to avoid scratching the steel blank.

The above embodiments are merely illustrative of the principles and effects of the invention and are not intended to limit the invention. Therefore, those skilled in the art can make modifications and changes to the above embodiments without departing from the spirit of the invention. The scope of the invention should be as set forth in the appended claims.

1‧‧‧Study of water mist ultrasonic detection device

2‧‧‧Bronze mold

3‧‧‧Open casting rod

4‧‧‧Steel

5‧‧‧Roller

6‧‧‧ nozzle

7‧‧‧Supersonic device

8‧‧‧ slag

11‧‧‧ Sensor

12‧‧‧Sensing film

13‧‧‧Nozzles

1 is a schematic view showing a conventional water mist ultrasonic detecting device; FIG. 2 is a flow chart showing a continuous casting water mist ultrasonic detecting method according to the present invention; and FIG. 3 is a view showing a water mist ultrasonic wave in a continuous casting process of the present invention. FIG. 4 is a diagram showing the relationship between the intensity of the water mist intensity-reflected wave signal output signal of the present invention; FIG. 5 is a view showing the positional relationship of the output signal intensity-ultrasonic device of the reflected wave signal using the first type of nozzle of the present invention; FIG. 6 shows a positional relationship diagram of the reflected wave signal output signal intensity-ultrasonic device using the second type of nozzle of the present invention.

2‧‧‧Bronze mold

3‧‧‧Open casting rod

4‧‧‧Steel

5‧‧‧Roller

6‧‧‧ nozzle

7‧‧‧Supersonic device

8‧‧‧ slag

Claims (8)

A continuous casting water mist ultrasonic detecting method comprises the following steps: (a) providing at least one ultrasonic device for generating an ultrasonic wave, the ultrasonic wave contacting the water mist to form a reflected wave signal; (b) Taking the reflected wave signal; and (c) obtaining the state data of the water mist according to the reflected wave signal; wherein the continuously casting water mist ultrasonic detecting method is applied to a continuous casting process, wherein the continuous casting process is Performed in a continuous casting apparatus, the continuous casting apparatus comprising a copper mold, an open casting rod, a plurality of pairs of rollers, and at least one nozzle, the open casting rod can enter between the copper mold and the pair of rollers, the nozzle And disposed on the side of one of the adjacent casters, the ultrasonic device is fixed on the open cast rod and is located on the same side of the open cast rod, the water mist is A nozzle is injected to the ultrasonic device. The method for continuously detecting a water mist ultrasonic wave according to claim 1, wherein in the step (b), the ultrasonic wave device extracts the reflected wave signal. The method for continuously detecting a water mist ultrasonic wave of claim 1, wherein after the step (b), the step of outputting the reflected wave signal to a signal processing device is further included. The method for detecting a continuous water mist ultrasonic wave according to claim 3, wherein the signal processing device is a computer. The method for detecting a continuous water mist ultrasonic wave according to claim 1, wherein the reflected wave signal captured in the step (b) is converted into an analog signal. A continuous method for detecting a water mist ultrasonic wave according to claim 1, wherein In the step (c), the state information of the water mist includes at least one of the intensity and the flow rate of the water mist. A method of continuously detecting a water mist ultrasonic wave according to claim 1, wherein in the steps (a) to (c), a step of calculating the position of the ultrasonic device is further included. The method for continuously detecting a water mist ultrasonic wave according to claim 7, wherein in the step of calculating the position of the ultrasonic device, the ultrasonic device disposed on the open casting rod moves from a pair of rollers at a moving speed to The other pair of rollers, for a moving time, calculates the position of the ultrasonic device based on the moving speed of the ultrasonic device and the moving time.