KR100939315B1 - Device for measuring crop profile and velocity of hot bar by using optical fiber - Google Patents

Abstract

The present invention relates to an apparatus for measuring the front and rear crop shape of the hot bar and the speed of the hot bar while passing through the roughing mill of the hot rolling mill, and at least two or more between rollers of the roller table to which the hot bar passing through the roughing mill is conveyed. A hot bar detector, which is an optical fiber sensor that is excreted and detects light in the infrared region; A crop shape detector arranged in front of the crop cutter which is the end of the roller table, the hot bar detector being arranged in a width direction of the hot bar on the fixing member; A signal processor electrically connected to the hot bar detector, calculating a moving speed of the hot bar using a distance and a moving time between the hot bar detectors, and connected to a crop shape detector to receive crop shape information by scanning through the hot bar detector; It includes a PLC for controlling the driving of the crop cutter based on the speed information and the shape information received through the signal processor.

According to the present invention, a hot bar detector and a crop shape detector can accurately read and cut a crop cutting position at the front and rear ends of the hot bar without any influence of water vapor generated on the surface of the hot bar.

Description

DEVICE FOR MEASURING CROP PROFILE AND VELOCITY OF HOT BAR BY USING OPTICAL FIBER}

1 is a schematic configuration diagram showing a facility for measuring the crop shape and speed of a conventional hot bar;

2 is a specific configuration diagram of a conventional measuring equipment,

3 is a schematic configuration diagram of a measuring device of the present invention;

Figure 4 is a detailed cross-sectional view of the hot bar detector constituting the measuring device of the present invention,

5 and 6 are a perspective view and an installation state of the crop shape detector constituting the measuring device of the present invention.

Explanation of symbols on the main parts of the drawings

1 .... crude rolling mill 2 .... hot bar

4 .... crop cutter 5 .... roller table

20..Hotbar detector 22..Condensing lens

24 .... optical fiber 26 .... sheath

30..Crop shape detector 32..Fixing member

40 .... Signal Processor 42 .... Avalanche Photodiode (APD)

50 .... PLC

The present invention relates to a device for measuring the front and rear crop shape and hot bar speed of a hot bar made while passing through a roughing mill of a hot rolling mill, and more specifically, for a post process using a hot bar detector and a crop shape detector using an optical fiber. The present invention relates to an apparatus for measuring crop shape and speed of a hot bar using an optical fiber in which unnecessary portions can accurately detect and cut the front and rear crops of the hot bar.

Conventionally, as illustrated in FIG. 1, a CCD sensor is used to measure the cropping shape and the speed of the hot bar 2 generated at the front and rear ends of the hot bar 2 while passing through the roughing mill 1. The line scan type CCD camera head 3 is installed above the cropping machine 4 and the front roller table 5 to scan the line, and then transmits a scan signal to the signal processor 6, and the signal processor 6 scans the line. After analyzing the signal to calculate the shape of the crop and the speed of the hot bar (2), the calculation information is sent to the upper controller (7), and the PLC (7) controls the crop cutter (4) based on the signal. Crop generated was cut.

By the way, the CCD camera head 3 is arranged with a plurality of cell-shaped CCD sensors 8 as shown in Fig. 2, and the CCD camera head 3 is arranged in the width direction of the hot bar 2. Therefore, the water vapor generated by the cooling water sprayed to cool the roller table 5 or the cooling water sprayed to remove the scale generated on the surface of the hot bar 2 maintained at about 1000 ° C is viewed in the field of view of the CCD camera head 3. Frequently, the detection of the hot bar's crop shape and speed was disturbed.

In addition, the line scan type CCD camera head (3) is a combination of a CCD camera consisting of a plurality of CCD sensors (8), so the configuration is complicated, because it is exposed in a high-temperature working environment separate cooling to cool it There was a disadvantage that means were required.

The present invention has been made in view of the above-mentioned problems of the prior art, and has been created to solve the above problems. The hot bar detector using the optical fiber and the crop shape detector, regardless of water vapor generated on the surface of the hot bar using the crop shape and It is an object of the present invention to provide a hot bar crop shape and a speed measuring device using a simple optical fiber that does not require a separate cooling means, as well as to cut the unnecessary parts more precisely by measuring the speed accurately.

The above object of the present invention is a hot bar detector, which is an optical fiber sensor for detecting light in the infrared region and at least two or more disposed between the rollers of the roller table to which the hot bar passed through the roughing mill is conveyed; A crop shape detector arranged in front of the crop cutter which is the end of the roller table, the hot bar detector being arranged in a width direction of the hot bar on the fixing member; A signal processor electrically connected to the hot bar detector, calculating a moving speed of the hot bar using a distance and a moving time between the hot bar detectors, and connected to a crop shape detector to receive crop shape information by scanning through the hot bar detector; It is achieved by providing a crop shape and speed measuring device of a hot bar using an optical fiber, characterized in that it comprises a PLC for controlling the driving of the crop cutter based on the speed information and shape information received through the signal processor.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

3 is a schematic configuration diagram showing an installation state of a measuring apparatus according to the present invention.

As shown in the drawing, the measuring device of the present invention has rollers at the rear end side of the roller table 5 before the hot bar 2 having passed the rough mill 1 enters the crop cutter 4 through the roller table 5. Hot bar detector 20 disposed between at least two, the crop shape detector 30 disposed in front of the crop cutter 4 at a distance from the hot bar detector 20, and the hot bar detector 20 And the signal processor 40 electrically connected to receive the detected signal through the crop shape detector 30 and the signal processor 40 and control the cutting operation of the crop cutter 4 according to the processing signal. Is composed of a PLC (PROGRAMMABLE LOGIC CONTROLLER) 50.

The hot bar detector 20 is a kind of photodetector or optical sensor using an optical fiber, which is well known, and receives light in an infrared region that emits light from a high temperature hot bar 2 near 1000 ° C. An element for detecting the hot bar 2.

As illustrated in FIG. 4, the hot bar detector 20 includes a condenser lens 22 that collects light in an infrared region emitted from the hot bar 2 and avalanche having received light in the signal processor 40. It consists of an optical fiber 24 connected to be transferred to an AVALANCHE PHOTO DIODE (hereinafter referred to as 'APD') 42 and a protective tube 26 that is covered around its outer periphery to protect the optical fiber 24.

Crop shape detector 30 is to scan the shape of the crop to display it in the shape as shown in Figure 5 and 6, the hot bar detector 20 of the above-described configuration is the length of the fixing member 32 In the direction of a plurality of closely spaced intervals, each hot bar detector 20 is connected to each of the APD 42 and the optical fiber 24, and the fixing member 32 is each roller of the roller table (5) In particular, it is arrange | positioned in the width direction of the hot bar 2 in the crop shape detector 30 especially.

The signal processor 40 uses the digital signal converted through the APD 42 with the APD 42 described above to calculate the speed of the hot bar 2 by a speed calculation equation to be described later, as well as the crop shape. The shape of the scanned crop is read through the detector 30, and the calculated and read information is electrically connected to each other so that it can be sent to the PLC 50.

The PLC 50 determines the cutting position of the hot bar 2 in consideration of the calculated speed of the hot bar 2 by receiving the information of the signal processor 40 and drives the crop cutter 4 according to the determined position. It is configured to be controlled.

The operating relationship of the present invention made of such a configuration is as follows.

The light in the infrared region emitted while the hot bar 2 is transferred is received through the condenser lens 22 and then transmitted to the APD 42 through the optical fiber 24 to start the speed measurement operation of the hot bar 2.

At the same time as the measurement start, the signal processor 40 obtains the speed of the hot bar 2. The speed can be easily calculated by dividing the moving distance of the object by the time it takes to move the object. The speed of the hot bar 2 is obtained.

That is, as in Equation 1 below,

(Equation 1)

v = s / t

(v is the velocity of movement at the front or rear of the hotbar,

s is the distance of the hot bar detection period (installation interval)

t is its travel time (i.e., the period of the digital signal converted in the APD)

The obtained information about the moving speed of the hot bar 2 is sent to the PLC 50.

In addition, at the time when the front end or the rear end of the hot bar 2 passes through the crop shape detector 30, it passes through a plurality of hot bar detectors 20 arranged in the fixing member 32 of the crop shape detector 30 according to its shape. Since the viewpoints are different, the shapes can be confirmed by converting and displaying each viewpoint into an electrical signal.

Information about the shape is immediately transmitted to the PLC (50), the PLC 50 determines the shape information transmitted from the signal processor 40 and the speed information of the hot bar (2) to operate the crop cutter (4) By controlling, it is possible to cut the crop at the correct cutting position.

As described in detail above, the present invention can accurately read and cut the cropping position of the front and rear ends of the hot bar without any influence of water vapor generated on the surface of the hot bar through the hot bar detector and the crop shape detector.

Claims (3)

A hot bar detector 20, which is an optical fiber sensor disposed at least two or more between the rollers of the roller table 5 through which the hot bar 2 passed through the roughing mill 1 is transferred, and detects light in the infrared region; A plurality of hot bar detectors 20 are arranged on the fixing member 32 at regular intervals in the width direction of the hot bar 2 and disposed in front of the crop cutter 4 adjacent to the roller table 5. 30; A signal processor that is electrically connected to the hot bar detector 20 and calculates a moving speed of the hot bar 2 by the following equation, and is connected to the crop shape detector 30 to receive the crop shape information by scanning through the crop shape detector 30. 40; And a PLC (50) for controlling the driving of the crop cutter (4) based on the speed information and the shape information received through the signal processor (40). The hot bar detector 20 includes a condenser lens 22 that collects light in an infrared region, an optical fiber 24 that transmits light received through the condenser lens 22, and a protective lens 22 for protecting the optical fiber 24. Crop shape and speed measurement apparatus of a hot bar using an optical fiber, characterized in that it comprises a protective tube (26) covered on the outer periphery. (expression) v = s / t (v is the moving speed of the front or rear end of the hot bar, s is the distance between the hot bar detectors (installation interval, t is the moving time) delete The method of claim 1, The signal processor 40 has a built-in APD 42 for converting the optical signal of the infrared region transmitted through the optical fiber 24 of the hot bar detector 20 and the crop shape detector 30 into a digital signal. Crop shape and speed measuring device of hot bar using optical fiber.

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