JPH06128653A - Device for detecting identification hole in steel sheet in furnace - Google Patents

Abstract

PURPOSE:To automatically detect an identification hole in a steel sheet during shifting in a furnace part in a continuous steel sheet treating device having an annealing furnace. CONSTITUTION:Mutually faced opening holes 2e, 2r are opened at the furnace wall parts while holding the shifting line of the steel sheet, and an optical source 10e at the outside of one side in the two opening holes and an optical detector 10r at the outside of the other side of the opening hole are disposed. Shield bodies 3e, 3r having opening holes are placed between each opening hole and the optical source and the optical detector respectively and two sliders 7e, 7r having windows with optical transmitting plates are arranged between the opening hole in one side of the shielding body and the optical source and between the opening hole in the other side of the shielding body and the optical detector, respectively to detect the identification hole in the steel sheet in the furnace. In inner space of each shielding body, a pipe for N2 purge is introduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting an identification hole in a steel sheet in a furnace, and more particularly, but not exclusively, to detecting an identification hole in a steel sheet moving in a continuous annealing furnace. .

[0002]

2. Description of the Related Art For example, in a continuous annealing furnace for transferring a steel sheet at a high speed, a steel sheet transfer path length in the furnace is as long as 2,000 m in order to secure a residence time in the furnace at each point of the steel sheet. This long path length
In order to secure with a relatively short furnace length, the steel plate is guided back and forth in the ninety-nine fold by reciprocating vertically in the guide roll. This is a furnace section according to applications such as heating and cooling, and between adjacent furnaces, a furnace wall gap in the height direction that horizontally guides the steel sheet is a narrow neck. Generally, the annealing temperature control is performed for each furnace. In order to continuously pass the steel sheet through such a continuous annealing furnace, the steel sheet is a continuous body in which the tail end of the preceding steel plate is welded to the tip of the following steel plate, and therefore different steel plates are continuously connected and continuously connected. Flows in the annealing furnace. The heat treatment conditions in the annealing furnace may differ for each steel sheet before connection, and in this case, it is necessary to track the position of the steel sheet in the furnace and execute temperature control corresponding to the steel sheet present in each furnace. is there.
Therefore, the connecting portion of the steel plate is provided with two or four holes indicating the joint portion, that is, a joint identification hole. At the furnace entrance, these holes are detected with a photo sensor to automatically detect the arrival of joints, and in conjunction with the movement of the steel plates in the furnace, the joints are automatically tracked to recognize the position of each steel plate in the furnace. Based on the above, the required temperature control is performed in each furnace for each steel plate (one steel plate between the joints).

[0003]

Since the total length of the steel sheet from the furnace inlet to the outlet reaches 2,000 m, the position tracking error of each steel sheet increases as it approaches the furnace outlet, and the temperature control accuracy of each steel sheet is Especially, it becomes lower at the leading end (near the leading joint) and the trailing end (near the trailing joint). In the furnace, there are expansion and contraction of the steel plate due to heating and cooling, slip of the steel plate and the roll, etc. Even if the moving speed of the steel plate at the furnace inlet and the furnace outlet is the same and constant, it is locally Since the speed of the steel sheet varies, the accuracy of the position tracking data of each steel plate in the furnace is low. Therefore, not only the furnace inlet but also various holes in the furnace are detected for joint identification, and the position tracking data is corrected there, or each steel plate in the section up to the next hole detection position at each hole detection position ( Accurately, it is preferable to suppress the accumulation of position tracking errors by, for example, performing position tracking at each stitch. For that purpose, it is indispensable to detect holes for identifying joints of steel plates in the furnace.

An object of the present invention is to provide an identification hole detecting device for performing this type of detection.

[0005]

The identification hole detection device of the present invention is a furnace wall (Lt-Lt) facing each other with a steel plate transfer line (Lt-Lt) in the furnace portion of a continuous steel strip processing facility having an annealing furnace interposed therebetween. First opening (2e) and second opening (2r) facing each other opened in 1e, 1r); surrounding the first opening (2e) and second opening (2r) outside the furnace and facing these openings A first shielding material (3e) and a second shielding material (3r) having an opening (4e / 4r) at a portion to be formed; a first shielding material (3e)
The first light-transmissive plate (8e) which closes the opening (4e) of the first light-transmitting plate and allows light passing through the opening (4e) to substantially pass therethrough; the opening (4r) of the second shielding material (3r)
And a second light-transmissive plate (8r) through which the light passing through the opening (4r) can be substantially transmitted; the plate (8r) being located outside the first light-transmissive plate (8e). 8e), a light source device (10e) that emits light toward the second opening (2r) through the opening (4e) and the first opening (2e) of the first shielding material (3e); and the second light transmission. A second light-transmitting plate outside the flexible plate (8r) and passing through the first opening (2e), the second opening (2r) and the opening (4r) of the second shielding material (3r). body
(8r) to detect the light arriving, the steel plate transfer line (Lt-
(Lt) equipped with a photodetector (10r) for detecting the identification hole of the steel plate moving along, the symbols shown in the above parentheses are for reference to the reference numerals of corresponding elements in Examples described later. Although shown, the components of the present invention are not limited to the specific components in the embodiments.

[0006]

[Operation] The light source device (through the first opening (2e) and the second opening (2r) facing each other opened in the facing furnace walls (1e, 1r) of the furnace part of the continuous steel strip processing equipment having the annealing furnace The light detection device (10r) receives the light emitted by 10e). When the steel plate is present in the steel plate transfer line (Lt-Lt) between the first opening (2e) and the second opening (2r), the light detection device (10r) does not substantially receive the light emitted by the light source device (10e). . If the steel plate has a hole for identification, the light detecting device (10r) detects the light passing through the hole. That is, a hole for identifying the steel plate is detected.

In a preferred embodiment of the present invention, the first shielding material
The inner space of (3e) and a second shielding member (3r), Pa - N ₂ for di
It is equipped with pipes (11e, 12e / 11r, 12r) for supplying gas. According to this, the N ₂ gas blocks the gas in the furnace from entering the inner space of the shielding material (3e / 3r), and thus the furnace wall (1e, 1r)
Of the light-transmissive plate (8e / 8r) facing the first opening (2e) and the second opening (2r) is suppressed, and the light-transmissive plate (8e / 8r) and those The surrounding members are cooled.

Furthermore, in a preferred embodiment of the present invention, the first light-transmissive plate (8e) and the second light-transmissive plate (8e).
r) each has two or more sets (8e, 9e / 8r, 9r) and one set (8e / 8
When (r) is placed at the opening (2e / 2r) position, the other (9e / 9r) is placed in the retracted position and one set (8e / 8r) of plate bodies is opened.
Open the first position and the other (9e / 9r) to be placed at the position (2e / 2r) (2e / 2
Slider (7e / 7r) that can be moved to the second position, which is located at position r)
Equipped with. According to this, the atmosphere inside and outside the furnace has a lot of dust and the like, and the light transmissive plate (8e / 8r) is easily soiled, but one set of plate (8e / 8r) is opened (4e / 4r). Position 1st position and others (9e /
9r) can be moved to the second position where it is located at the opening (4e / 4r) position, so after cleaning the plate (9e / 9r) in the retracted position, slide the slider (7e / 7r) to the second position. By sliding the furnace opening (2e / 2r) to the outside air,
A clean light-transmitting plate (9e / 9r) can be placed at the furnace opening (2e / 2r) position. That is, the light-transmissive plate (8e, 9e / 8r, 9r) covering the furnace opening (2e / 2r) can be cleaned during the operation of the furnace, and the work therefor is simple, and therefore the light-transmissive plate Plates (8e, 9e / 8r, 9r) can always be kept clean.

Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.

[0010]

1 and 2 show an embodiment of the present invention.
FIG. 1 shows horizontally guiding steel sheets between adjacent furnaces in a continuous annealing furnace in which tandem (serial) furnaces that guide the steel sheet vertically in a longitudinal direction by a guide roll are arranged in a zigzag manner. Steel plate transfer line Lt at the neck with a narrow furnace wall gap in the height direction
2 shows a vertical cross section taken along line -Lt, and FIG. 2 shows a cross section of the neck portion orthogonal to the steel plate transfer line Lt-Lt. That is, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, FIG. 1 is a sectional view taken along the line II of FIG. 2, and the line Wd-Wd in FIG. 2 indicates the width direction of the steel sheet. A first opening 2e and a second opening 2r are formed in the lower furnace wall 1e of the neck shown in these drawings and the upper furnace wall 1r facing the lower furnace wall 1r so as to face each other.

A substantially rectangular box-shaped shield 3e surrounding the first opening 2e is fixed to the outer surface of the lower furnace wall 1e.
The upper wall of the shield 3e has an opening (upper opening) aligned with the first opening 2e, and the lower wall facing the upper opening also has an opening (lower opening). Guide rails 13e and 14e extending along the steel sheet transfer line Lt-Lt are fixed to the lower surface of the lower wall so as to sandwich the lower opening, and the slider 7e is attached to these guide rails 13e and 14e. It is movably guided in a direction along the steel plate transfer line Lt-Lt. The slider 7e is provided with two openings 5e and 6e arranged in a direction along the steel plate transfer line Lt-Lt, and these openings 5e and 6e are closed by tempered Pyrex glass 8e and 9e each having a thickness of 10 mm. ing.

A support arm 15e is fixed to the lower furnace wall 1e, and a light source device 10e containing a cooling medium tube is fixed to the support arm 15e. This light source device 1
0e radiates slit light having a spread in the steel plate width direction Wd-Wd. The light source of the light source device 10e is a plurality of infrared LEDs that show a light intensity peak at a wavelength of 950 nm, and these are arranged at a predetermined pitch in the steel plate width direction Wd-Wd. Therefore, to be precise, the light emitted from the light source device 10e is a linear array of light having a linear or conical spread.

A substantially rectangular box-shaped shield 3r surrounding the second opening 2r is fixed to the outer surface of the upper furnace wall 1r.
The lower wall of the shield 3r has an opening (lower opening) aligned with the second opening 2r, and the upper wall facing the lower opening also has an opening (upper opening). Guide rails 13r and 14r extending along the steel sheet transfer line Lt-Lt are fixed to the upper surface of the upper wall so as to sandwich the upper opening, and the slider 7r is attached to these guide rails 13r and 14r. It is movably guided in a direction along the steel plate transfer line Lt-Lt. The slider 7r is provided with two openings 5r and 6r arranged in the direction along the steel plate transfer line Lt-Lt, and these openings 5r and 6r are closed by tempered Pyrex glass 8r and 9r having a thickness of 10 mm, respectively. ing.

A support arm 15r is fixed to the upper furnace wall 1r, and a photodetector 10r containing a cooling medium tube is fixed to the support arm 15r. This photo-detecting device 10r is a photoelectric conversion element array in which a plurality of n photoelectric conversion elements are arranged at a predetermined pitch in the direction along the steel plate transfer line Lt-Lt, and the signal of each element is processed to indicate light reception / non-light reception. A signal processing circuit for generating a set of value signals, a sampling circuit for picking up n sets of binary signals substantially simultaneously at a predetermined sampling period and writing them in a shift latch (memory) of n columns and m stages, and n × m of shift latches. The memory cell includes a light receiving pattern detection circuit that detects the presence or absence of the identification hole from the binary signal level distribution indicating "light reception" and outputs an identification hole detection electric signal. Therefore, the light source device 10e
When the identification hole exists between the light detection device 10r and the light detection device 10r (passes), the light detection device 10r generates the identification hole detection signal.

N ₂ gas pipes 11e, 12e and 11r, 12r are introduced into the inner spaces of the shields 3e and 3r, respectively, and N ₂ gas is supplied to them. N ₂ gas pipe 11e, 12e and 11r, the 12r, respectively and nozzle is opened for injecting the N ₂ gas to the opening 4e and the 4r, N ₂ Gasupa - opening by di 4e and 4r
The inner surfaces of the glasses 8e and 8r that close the glass are kept clean and the glasses 8e and 8r and their surrounding components are cooled. The N ₂ gas exiting the gas pipes 11e, 12e and 11r, 12r and hitting the glasses 8e and 8r enters the furnace through the openings 2e, 2r. These N ₂ gas flows make it difficult for the gas in the furnace to enter the inner spaces of the shielding members 3e and 3r.

The operator may, if necessary or regularly,
The sliders 7e and 7r are slid along the guide rails 13e and 13r to replace the glass facing the openings 2e and 2r. For example, as shown in FIG. 1, glasses 8e, 8
When r is opposed to the openings 2e, 2r, first, the front and back surfaces of the glass 9e, 9r are cleanly cleaned, and then the sliders 7e, 7r are slid rightward to clean the glass 9e, 9r into the openings 2e, 2r. Face each other. As a result, the glasses 8e and 8r are located on the right side of the shielding members 3e and 3r, and the front and back surfaces of the glasses 8e and 8r can be cleaned this time. In this way, the openings 2e,
You can replace the glass facing 2r with a cleaned one,
Cleaning the glass is easy. The inner space of the shielding members 3e and 3r is not opened to the outside air when the glass is replaced in this way.

[0017]

As described above, according to the identification hole detecting device of the present invention, the identification holes of the steel plate moving in the furnace of the continuous steel strip processing equipment having the annealing furnace are detected, so that it can be detected in various places in the furnace. A hole for joint identification is detected and the position tracking data is corrected there, or the position of each steel plate (to be exact, each stitch) in the section up to the next hole detection position at each hole detection position is tracked. For example, the accuracy of tracking the position of the steel plate in the furnace can be improved by carrying out such a process.

[Brief description of drawings]

FIG. 1 Horizontally guides a steel sheet between adjacent blocks of a continuous annealing furnace in which a furnace that guides the steel sheet in a longitudinal direction by a guide roll in a zigzag manner is arranged in tandem (serial). FIG. 3 is a vertical cross-sectional view of a neck portion having a narrow furnace wall gap in the height direction along a steel plate transfer line Lt-Lt, which is a cross-sectional view taken along the line I-I of FIG. 2.

FIG. 2 is a sectional view taken along line II-II of FIG.

[Explanation of symbols]

1e: Lower furnace wall 1r: Upper furnace wall 2e: First opening 2r: Second opening 3e: First shield 3r: Second shield 4e: Opening 4r: Opening 5e, 6e: Opening 5r, 6r: Opening 7e: First slider 7r: Second slider 8e, 9e: Light-transmissive plate 8r, 9r: Light-transmissive plate 10e: Light source device 10r: Photodetector 11e, 12e: N ₂ gas pipe 11r, 12r:
N ₂ gas pipes 13e, 14e: guide rails 13r, 14r:
Guide rail 15e: Support arm 15r: Support arm
Mu

Claims (3)

[Claims] 1. A first opening and a second opening, which face each other and which face each other with a steel plate transfer line in a furnace portion of a continuous steel strip processing facility having an annealing furnace, which are opened in the furnace wall facing each other; A first shielding material and a second shielding material that surround the opening and the second opening and have openings at portions opposite to these openings; light that passes through the opening of the first shielding material and that substantially passes through the first shielding material; A first light-transmissive plate member; a second light-transmissive plate member which closes an opening of the second shielding material and allows light passing through the opening to substantially pass therethrough;
A light source device which is outside the light-transmissive plate body, emits light toward the second opening through the plate body, the opening of the first shielding material, and the first opening; Along the steel plate transfer line, which is on the outside of the plate body and detects the light arriving from the first opening through the second opening and the opening of the second shielding material to the second light-transmissive plate body. An identification hole detection device for a steel plate in a furnace, comprising: an optical detection device for detecting an identification hole of a moving steel plate. 2. The identification hole detection device for the in-reactor steel plate according to claim 1, further comprising a tube body for supplying gas to the inner space of the first shielding material and the second shielding material. 3. A relationship in which two or more sets of a first light-transmissive plate body and a second light-transmissive plate body are provided, and when one set is placed at the opening position, the other is in a retracted position. Placed in 1
The identification of the in-reactor steel plate according to claim 1 or 2, further comprising a slider that can be moved to a first position for placing a set of plates at the position of the opening and a second position for placing the other plate at the position of the opening. Hole detection device.