JP3038704B2 - Roll spacing measurement method for continuous casting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of measuring a roll interval of a continuous casting facility, and more particularly to a method of measuring a roll distance of a dummy bar which is transferred prior to the transfer of a slab, based on distance information detected by a distance sensor provided on the dummy bar. Also in this case, the present invention relates to a method of measuring a roll interval of a continuous casting facility for calculating a true roll interval.

[0002]

2. Description of the Related Art In the operation of continuous casting, the interval between rolls of a pair of rolls which are arranged in the thickness direction of a slab of a group of rolls which sandwich a slab to be drawn from a mold and transport the slab along a predetermined path is set. One of the most important issues is role management to keep it properly.

[0003] In a continuous casting facility, an inner roll group and an outer roll group are provided to face each other along a path of drawing a slab from a mold, and the interval between the rolls facing each other within a predetermined range. If not maintained, various inconveniences such as poor shape and internal cracks occur in the cast slab obtained as a product. If the roll gap is left undetected without any abnormality detected, the load on other roll pairs adjacent to the roll pair in which the abnormality has occurred increases, and an abnormality is induced in the adjacent roll pair to operate. In some cases, a stoppage may occur.

As described above, in the operation of the continuous casting facility, it is important to control the roll interval between each pair of rolls. However, since the number of roll pairs to be arranged is several tens to several hundreds, each roll pair is required. It is not easy to always manage the roll interval of the rolls in terms of man-hours and costs. Therefore, prior to the operation of continuous casting, there has been conventionally known a roll interval measuring device for managing a roll interval using a dummy bar inserted as a pseudo bottom of a mold. A conventional roll distance measuring device is, for example, as disclosed in Japanese Patent Application Laid-Open No. 4-15510 by the applicant of the present invention, in which a roll distance measuring device is disposed on a dummy bar, and the roll distance is measured each time the dummy bar passes through each roll pair. Some devices are configured to detect a roll interval.

FIG. 10 shows an embodiment of a roll distance measuring device disclosed in Japanese Patent Application Laid-Open No. 4-015510. In FIG.
The roll interval measuring device 30 attached to the dummy bar 31 with the bolts and nuts 37 is provided with a cylinder 3 protruding in the vertical direction.
2a and 32b, and detection heads 33a and 33b are provided at the tips of the cylinders 32a and 32b. The cylinders 32a and 32b are urged in a vertical protruding direction by a spring 34a (and 34b (not shown)). When the dummy bar 31 is transferred, the detection heads 33a and 33b contact the outer circumferences of the upper roll La and the lower roll Lb, respectively. And is configured to apply a pressing force.

Further, the roll distance measuring device 30 has a built-in displacement gauge 35a (and 35b not shown), and connects a displacement detecting rod 36a (and 36b not shown) to the cylinders 32a and 32b, and the upper roll La and the lower roll La. Cylinder 32 generated by being pressed by the outer periphery of side roll Lb
a, 32b in the vertical direction can be detected by the displacement meter 35a (and 35b (not shown)), and based on the displacement detected by the displacement meter 35a (and 35b (not shown)), the reference position of the roll distance measuring device 30 is determined. Detection head 33
It is configured so that the distances to the leading ends of the a and 33b (the outer circumferences of the roll La and the roll Lb) can be measured.

[0007]

Problems to be Solved by the Invention
The roll gap measuring device disclosed in Japanese Patent Application Laid-Open No. H10-260, as shown in the explanatory diagram of the pair of roll gaps facing each other in FIG. 11, a center line Y connecting the centers of the upper roll La and the lower roll Lb of the roll pair, In the case where the center line C in the transfer direction of the dummy bar 31 is in a vertical relationship (a), the roll interval measuring device 30 is connected via the detection heads 33a and 33b shown in FIG.
Is a value corresponding to the true roll interval, but the dummy bar 31 is inclined and the center line C _A in the transfer direction is detected.
Has a tilt angle θ from the center line C in the case of FIG.
There is a problem that the amount of displacement detected by the roll gap measuring device 30 via the detection heads 33a and 33b does not become a value corresponding to the true roll gap. When the dummy bar 31 is transported along a path constituted by a plurality of roll pairs, it is often transported with a tilt angle θ as shown in FIG.

FIG. 11 shows a problem in the case where the dummy bar 31 has a vertical inclination angle θ with respect to the transport direction. Similarly, when the dummy bar 31 is tilted around the longitudinal axis of the dummy bar 31 or when the dummy bar 31 There is a problem that the displacement amount detected by the roll interval measuring device 30 does not become a value corresponding to the true roll interval even when the roll interval is skewed with respect to the transport direction.

A first object of the present invention is to provide a continuous casting apparatus capable of calculating a true roll interval even when a dummy bar is tilted around the longitudinal axis of the dummy bar. An object of the present invention is to provide a method for measuring a roll interval.

A second object of the present invention is to provide a method for measuring a roll interval of a continuous casting facility which can calculate a true roll interval even when a dummy bar is skewed with respect to a transport direction and tilts around a longitudinal axis. Is to do.

[0011]

According to a first aspect of the present invention, there is provided a method for measuring a roll interval of a continuous casting facility.
The roll interval between a plurality of vertically opposed roll pairs that sandwich a slab to be drawn from a mold and transport along a predetermined path is predetermined in the dummy bar width direction above and below a dummy bar that is transported prior to the slab. A roll spacing measuring method for continuous casting equipment that calculates based on the distance to a pair of rolls detected by a plurality of distance sensors arranged at predetermined intervals in the width direction of the dummy bar above and below a plurality of distance sensors arranged at intervals. Wherein the true roll interval is measured in the following steps even when the dummy bar is inclined around the longitudinal axis. Step 1: The distance sensor interval (S) of the distance sensors arranged on the dummy bar is stored. Step 2: The distance information (J _XU , J _XD ) to the upper roll and the lower roll of an arbitrary roll pair is continuously detected at predetermined timing by the distance sensors facing up and down, and the detected distance information ( J _XU , J _XD ) are stored. Step 3: Deviation (ΔJ = J) of each minimum distance information (J _XDM , J _YDM ) to the lower roll (or upper roll) of an arbitrary roll pair detected by the adjacent distance sensor
_{XDM- JYDM} ) is divided by the distance sensor interval (S) to calculate the inclination angle (θ _R ). Step 4: Lower roll (or upper roll) of a predetermined roll pair detected by any of the opposed distance sensors
Minimum distance information (J _XDM), distance information to the minimum distance information (J _XDM) given roll pair of upper roll detected by the other distance sensor at the same timing of detection (or, lower roll) to (J _XU ) and the angle of inclination (θ
_R ) is multiplied by the cosine value (cos θ _R ) to calculate the true roll interval (L).

According to a first aspect of the present invention, there is provided a method for measuring a roll interval of a continuous casting facility, wherein the minimum distance information (J _XDM ) to a lower roll (or an upper roll) of an arbitrary roll pair detected by an adjacent distance sensor is provided. , J _YDM ) (ΔJ = J
_XDM -J _YDM ) by the distance sensor spacing (S) to calculate the tilt angle (θ _R ), followed by the lower roll (or
The minimum distance information to the upper roll) (J _XDM), until the minimum distance information (J _XDM) given roll pair of upper roll detected by the other distance sensor at the same timing of detection (or, lower roll) it is possible to cosine value of the distance information of the tilt angle to the sum of (J _XU) (θ _R) by multiplying the (cos [theta] _R) calculating the true roll distance (L), slope dummy bar is a longitudinal axis around Even when the rolls are transported, it is possible to correct the inclination angle (θ _R ) to accurately calculate the roll interval between the upper roll and the lower roll of any roll pair, and determine whether the roll interval is normal. it can.

According to a second aspect of the present invention, there is provided a method for measuring a roll interval of a continuous casting facility, comprising:
The rolls of a continuous casting facility which are calculated based on distance information to the roll pair detected by a plurality of distance sensors arranged at predetermined intervals in the dummy bar width direction, facing up and down a dummy bar transferred prior to the slab. In the interval measuring method, the dummy bar is skewed with respect to the transport direction (inclination angle δ with respect to the roll axis) and inclined around the longitudinal axis (inclination angle θ _R ).
In this case, the true roll interval is measured in the following steps. Step 1: The distance sensor spacing (S) of the distance sensors arranged on the dummy bar and the Nth and (N + 1) th roll installation design pitches (P) arranged in the roll cavity are stored. Step 2: Time difference (to) when adjacent distance sensors detect the minimum distance information (J _XUM , J _YUM ) to the upper roll (or lower roll) of an arbitrary roll pair
Is calculated. Step 3: One of the adjacent distance sensors is
Minimum distance information between Nth and N + 1th rolls (J _XUM )
Is calculated, the time difference (T) between the rolls is calculated. Step 4: The ratio of the roll installation design pitch (P) and the time difference between the rolls (T) is calculated to transfer the dummy bar (V).
Is calculated. Step 5: Time difference (t) in transfer speed (V) of dummy bar
o) multiplied by, calculates the distance to the dummy bar and the other of the distance sensor when one detects the minimum distance information (J _XuM) distance adjacent sensor detects the minimum distance information (J _YUM) (X) I do. Step 6: The inclination angle δ of the skewed dummy bar is calculated from the distance sensor interval (S) and the distance (X), and the virtual sensor interval (S _A ) is calculated from the distance sensor interval (S) and the cosine value (cos δ) of the inclination angle δ. ) Is calculated. Step 7: The deviation of each of the minimum distance information (J _XUM , J _YUM ) detected in Step 2 is determined by the virtual sensor interval (S _A ).
To calculate the inclination angle (θR) of the dummy bar around the longitudinal axis. Step 8: Upper roll (or lower roll) of a given pair of rolls detected by any of the opposed distance sensors
The minimum distance information to (J _XuM), distance information to the lower roll of the minimum distance information (J _XuM) given roll pair detected by the other distance sensor at the same timing of detection (or, upper roll) (J _XD ) and the angle of inclination (θ
_R ) is multiplied by the cosine value (cos θ _R ) to calculate the true roll interval (L).

According to a second aspect of the present invention, there is provided a method of measuring a roll interval of a continuous casting facility, wherein a time difference (T) between rolls when the minimum distance information (J _XUM ) between the _{Nth and} (N + 1) th rolls is detected, and a roll installation design pitch (P ) Is used to calculate the transfer speed (V) of the dummy bar.
_XUM , J _YUM ) and the distance (X) are calculated from the time difference (to) at which it was detected and the transport speed (V), and the distance sensor interval (S)
And the distance (X), the skew (inclination angle δ) of the dummy bar with respect to the transfer direction can be calculated. Subsequently, a virtual sensor interval (S _A ) is obtained from the calculated inclination angle δ and the distance sensor interval (S), and the minimum distance information (J) to the upper roll of the roll pair detected by the adjacent distance sensor.
After calculating the inclination angle (θ _R ) of the dummy bar around the longitudinal axis by dividing the deviation of _XUM , J _YUM ) by the virtual sensor interval (S _A ), the minimum distance to the upper roll detected by one of the opposed distance sensors is calculated. The distance information (J _XUM ) and the minimum distance information (J
The sum of _XuM) the distance information at the same timing detected to the lower roll and the other distance sensor detects (J _XD), by multiplying the cosine value of the inclination angle (θ _R) (cosθ _R) true roll Since the interval (L) can be calculated, even when the dummy bar is inclined with respect to the transport direction (inclination angle δ) and inclined around the longitudinal axis (inclination angle θ _R ), the inclination angle (δ) can be calculated. By correcting the inclination angle (θ _R ), the roll interval between the upper roll and the lower roll of an arbitrary roll pair can be accurately calculated.

According to a third aspect of the present invention, there is provided a method for measuring a roll interval of a continuous casting facility, wherein a preset rotation speed (V _X ) of a driving roll of a pair of rolls is applied instead of the transfer speed (V).

Since the preset rotation speed (V _X ) of the driving roll of the roll pair is applied instead of the transfer speed (V) of the dummy bar, the process of calculating the movement speed (V) can be omitted.

[0017]

Embodiments of the present invention will be described below with reference to the accompanying drawings. In addition, the present invention is based on distance information to a pair of rolls detected by a distance sensor arranged on a dummy bar, the roll interval between a plurality of roll pairs that sandwiches a slab drawn from a mold and transfers the roll along a predetermined path. Calculate the roll interval of the continuous casting equipment that can measure the true roll interval even if the dummy bar is inclined around the longitudinal axis, or the dummy bar is skewed with respect to the transport direction and inclined around the longitudinal axis. It provides a measuring method.

FIG. 1 is an overall configuration diagram of one embodiment of a continuous casting facility to which the method for measuring a roll interval of a continuous casting facility according to the present invention is applied. In FIG. 1, the continuous casting facility includes a dummy bar 8, a roll group 9, a distance sensor 2A (not shown, 2B) mounted on the dummy bar 8, and a roll group 9 based on distance information detected by the distance sensor 2A (2B, not shown). Is provided with the roll interval measuring device 1 for calculating the roll interval between all the roll pairs La and Lb.

The dummy bar 8 is used to test-transfer a plurality of pairs of rolls for nipping the slab to be drawn from the mold and transferring the slab along a predetermined path prior to the slab. At a predetermined interval, a plurality of bent sections 8a, 8b,
, 8i, and is transported in the path of a roll group 9 composed of a plurality of opposing upper rolls La and lower rolls Lb.

[0020] The distance sensor 2A, the distance sensor 2A _U for detecting the distance to the upper roll La on the upper side of the dummy bar 8
When, the dummy bar 8 and a distance sensor 2A _D for detecting the distance to the lower roll Lb on the lower side of the dummy bar 8 as a set
The dummy bar 8 is transported in the path of a roll group 9 composed of a plurality of opposed upper rolls La and lower rolls Lb, and passes through the respective roll pairs La and Lb. When doing, each upper roll La,
The distance of the lower roll Lb is detected, and distance information is continuously output at a predetermined timing.

FIG. 2 is an arrangement diagram of a distance sensor on a dummy bar. At a predetermined position of the dummy bar 8, a plurality of opposed distance sensors 2A to 2C are arranged in the width direction. The distance sensors 2A to 2C are respectively two distance sensors 2A _U , 2A _D ,
2B _U dummy bar 8, 2B _D, 2C _U, the 2C _D as a set
The distance sensors 2A _U , 2B _U , and 2
C _U detects the distance to the upper roll La of any roll pair, while the distance sensors 2A _D , 2B _D , and 2C _D detect the distance to the lower roll Lb of any roll pair. When transported through the gap, the distances from each distance sensor to the rolls of all roll pairs are continuously detected at a predetermined timing, and corresponding distance information is output.
Note that FIG. 2 shows an example in which three sets of distance sensors 2 </ b> A to 2 </ b> C are arranged.

Returning to the description of FIG.
Is based on a microprocessor, and includes a data processing unit 11, a data operation unit 12, a data storage unit 13, a determination unit 1
4. A display unit 15 that performs data processing, calculation of distance data, and the like based on the analog distance information supplied from the distance sensor 2A, and sets the calculated roll interval as a permissible value of the roll interval. After the comparison, the comparison result is displayed for all the roll pairs or the roll pairs that exceed the allowable value. Note that transmission and reception of distance information and control signals between the distance sensor 2A and the roll distance measuring device 1 are performed, for example, by wireless signals and are processed in real time. Further, a data storage medium (for example, a floppy disk) in which a control signal is recorded is provided to the dummy bar 8 and connected to the distance sensor 2A. Once stored, batch processing may be performed using the roll interval measuring device 1.

The data processing unit 11 includes a transmission / reception unit,
A / D converter, a timing signal generator, a memory, and the like, receive analog distance information transmitted from the distance sensor 2A at a predetermined timing, perform A / D conversion, and perform digital distance information (for example, J _XU and J _XD described later)
After that, the distance information (J _XU , J _XD ) is temporarily stored and provided to the data calculation unit 12.

The data operation unit 12 has various operation functions.
Digital distance information (J _XU , J _XD ) supplied from the data processing unit 11 and information preset in the data storage unit 13 (for example, distance sensor interval S, roll installation design pitch P, roll rotation speed V _X, etc.) ), The roll interval L of all roll pairs is calculated, and the calculated roll interval L
Is supplied to the determination unit 14.

The determination unit 14 a comparator, includes a memory, compared with the allowable value L _K of the calculated roll gap L between preset roll gap, roll spacing L is determined whether within the tolerance L _K, The determination signal is output to the display unit 15. The determination signal is a roll interval L for all roll pairs.
To form the deviation of the tolerance L _K or deviation tolerance roll pair exceeding L _K,.

The display unit 15 displays, printers, and a combination of speaker, roll spacing L is tolerance L _K
It visually and audibly displays whether or not it is inside.

Next, a description will be given of a roll gap measuring method for measuring the roll gap between roll pairs applied to the continuous casting facility of FIG. FIG. 3 is an explanatory view of the method for measuring the roll interval of the continuous casting facility according to the first aspect. In FIG. 3, a dummy bar 8 is provided between an arbitrary pair of rolls including an upper roll La (N) and a lower roll Lb (N) in parallel with the axis of the upper roll La (N) and the axis of the lower roll Lb (N). Is transported from the back side of the paper surface to the front side (the longitudinal axis direction of the dummy bar 8), a set of opposed distance sensors 2A each arranged at a distance sensor interval S at points X1, Y1 and Z1 of the dummy bar 8 Upper roll La detected by 2B, 2C
The distance L _U to the lower roll Lb and the distance L _D to the lower roll Lb are all equal, and if the thickness of the dummy bar 8 is ignored, the upper roll La
And the roll interval L (= L _U + L _D ) between the lower roll Lb and the lower roll Lb are values directly corresponding to the distance information detected by the distance sensors 2A, 2B, and 2C, respectively. Note that (N) represents the N-th roll pair.

Next, a case where the dummy bar 8 is transferred while being inclined at an arbitrary inclination angle θ _R around the longitudinal axis will be described. When the dummy bar 8 is tilted by the tilt angle θ _R, the distance sensors 2A, 2B, and 2C disposed at the X1, Y1, and Z1 points on the dummy bar 8 respectively have the X2 point,
Move to point Y2 and point Z2. Note that, for simplicity of description, in FIG. 3, the Y1 point and the Y2 point are set to the same position.

The distance sensor 2A of the dummy bar 8 the upper distance sensor 2A _U is the distance to the upper roll La (N) for detecting the X _U (distance information J _XU), under which a distance sensor 2A _D of the dummy bar 8 the lower detects the distance to the side roll Lb (N) becomes X _D (distance information J _XD). Similarly, the distance sensor 2
B, a distance sensor 2B _U of 2C, 2C _U each distance to the upper roll La (N) Y _U which detects (distance information J _YU), Z _U (distance information J _ZU), and the distance sensor 2
B _D, 2C _D the distance to the lower roll Lb (N) which is detected) each Y _D (distance information J _YD), Z _D (distance information J
_ZD ). Note that the distance information J _XU , J _XD , J _YU , J _YD ,
J _ZU and J _ZD represent values that are continuously detected at predetermined timings by the respective distance sensors and digitally converted by the roll distance measuring device 1 shown in FIG.

Sum of distances X _U and X _D (X _U + X _D ), distance Y _U
The sum of the _{Y D (Y U + Y D} ), and the distance Z _U and Z _D sum of (Z _U
+ Z _D ) is equal, but is not equal to the roll interval L (= L _U + L _D ) due to the influence of the inclination angle θR.

If the inclination angle θ _R is known, (X _U + X _D ), (Y _U
+ Y _D ) or (Z _U + Z _D ) to roll interval L (= L _U +
Since L _D ) can be calculated, a method of calculating the inclination angle θ _R will be described below. Note that the distance sensor is used to calculate the inclination angle θ _R.
And a distance sensor 2A _D for detecting the distance to the lower roll Lb of the distance sensor 2A;
Distance sensor 2 for detecting the distance to the lower roll Lb of B
A distance sensor adjacent to _BD is used.

FIG. 4 is an explanatory diagram for calculating the inclination angle θ _R. A right triangle OPQ is drawn from the distance X _D (distance information J _XD ), the distance Y _D (distance information J _YD ), the distance sensor interval S, and the inclination angle θ _R. As is apparent from the right triangle OPQ, tan θ _R is obtained by (Y _D −X _D ) / S.

[0033] Therefore, distance information J minimum distance information J _XDM in _XD, distance information J minimum distance information J _YDM in _YD, and prestored tilt angle using the distance sensor interval S are theta _R
Can be calculated from Equation 1.

[0034]

## EQU1 ## θ _R = tan ⁻¹ (J _YDM −J _XDM ) / S

When the inclination angle θ _R is obtained, (X _U +
X _D) and the inclination angle theta _R from the true roll spacing _{L (= L U + L D} )
Can be requested.

This is because the minimum distance information J _XDM in the distance information J _XD and the distance information J _XU detected at the same timing as when the minimum distance information J _XDM is detected (usually the minimum distance information J _XUM
And the inclination angle θ _R of Equation 1 can be calculated from Equation 2.

[0037]

L = (J _XDM + J _XU ) * cos θ _R

FIG. 5 is an operation flowchart of the method for measuring the roll interval of the continuous casting equipment according to the first aspect. When the dummy bar is transferred to the roll pair, the roll interval measuring device 1 is initialized (initialized). In step S1, the distance sensor interval S between the distance sensors 2A and 2B or the distance sensors 2B and 2C arranged on the dummy bar 8 is stored. I do.

Next, in step S2, the distance sensors 2A _U , 2A _D (2
B _U , 2B _D , or 2C _U , 2C _D ) in each of the upper roll La (N) and lower roll L of any roll pair
The distance information J _XU , J _XD (J _YU , J _YD or J _ZU , J _ZD ) up to b (N) is continuously detected at a predetermined timing, and the detected distance information J _XU , J _XD (J _YU , J _YD or J _ZU ,
J _ZD ) is stored.

[0040] Subsequently, in step S3, the distance adjacent sensor 2A _D and 2B _D (or 2A _U and 2B _U) under any pair of rolls has detected that side roll Lb (N) (or, upper roll La ( N)) the minimum distance information J _XDM , J of the distance information J _XD , J _YD (or J _XU , J _YU )
Deviation ΔJ of _YDM (or J _XUM , J _YUM ) (= J _XDM −J
_YDM or = J _XUM -J _YUM ) and calculate the deviation ΔJ
Is divided by the distance sensor interval S to calculate the inclination angle θ _R from Equation 1.

In step S4, minimum distance information J _XDM to the lower roll Lb (N) detected by the distance sensor 2A _D
At the same timing as when the minimum distance information J _XDM is detected, the sum of the distance information J _XU to the upper roll La (N) detected by the distance sensor 2A _U facing the distance sensor 2A _D is calculated. multiplied by the cosine value cos [theta] _R of the corner theta _R calculated from Equation 2 the true roll distance L to.

In step S5, the true roll interval L calculated in step S4 is compared with the allowable roll interval L _K set in advance in the roll interval measuring device 1, and the true roll interval L is determined to be equal to the allowable value L _K. if within the normal determination, whereas, by the determination of abnormality if outside true roll distance L is tolerance L _K the true roll spacing L tolerance L _K deviation (=
L-L _K) is recorded.

Then, steps S2 to S6 are repeated from the first to the last roll pair of the roll group 9, and
Normal / abnormal judgment for each role pair
The information including the deviation between the true roll interval L and the allowable value L _K (= L−L _K ) is displayed on a display or a printer.

In this embodiment, the distance sensors 2A and 2B adjacent to each other have been described. However, the present invention can be similarly applied to a combination of the distance sensors 2B and 2C or a combination of the distance sensors 2A and 2C. In the case of the distance sensors 2A and 2C, the distance sensor interval 2S may be used instead of the distance sensor interval S in steps S1 and S3.

In this embodiment, the true roll interval L
Distance information J _XDM detected by the distance sensor 2A in the calculation of
The sum of the distance information J _XU detected at the same timing as the above is used, but the sum of the distance information J _YU detected at the same timing as the minimum distance information J _YDM detected by the distance sensor 2B or the minimum distance detected by the distance sensor 2C The sum of the distance information J _ZU detected at the same timing as the information J _ZDM may be used.

As described above, according to the method of measuring a roll interval of a continuous casting facility according to the first aspect, the minimum distance to the lower roll (or upper roll) of an arbitrary pair of rolls detected by the adjacent distance sensor is determined. The deviation (ΔJ = J _XDM −J _YDM ) of the information (J _XDM , J _YDM ) is divided by the distance sensor interval (S) to calculate the inclination angle (θ _R ), and then one of the arbitrary facing distance sensors The minimum distance information (J) to the lower roll (or upper roll) of the predetermined roll pair detected in
_XDM ) and the sum of the distance information (J _XU ) to the upper roll (or lower roll) of the given roll pair detected by the other distance sensor at the same timing when the minimum distance information (J _XDM ) is detected. To the cosine value (cos θ _R ) of the inclination angle (θ _R )
, The true roll interval (L) can be calculated. Therefore, even when the dummy bar is transported while being tilted around the longitudinal axis, the tilt angle (θ _R ) is corrected and the upper side of any roll pair is corrected. The true roll interval L between the roll and the lower roll is accurately calculated, and the determination as to whether the roll interval is normal or not can be made for all roll pairs in the roll group by comparing with the allowable value L _K of the roll interval. .

FIG. 6 is an explanatory diagram of a method for measuring the roll interval of the continuous casting equipment according to the second aspect. FIG. 6 shows only the case where the dummy bar 8 is inclined with respect to the transport direction (the inclination angle δ with respect to the roll axis), and the state where the dummy bar 8 is inclined by the inclination angle θ _R around the longitudinal axis of the dummy bar 8 is shown. , FIG.
Alternatively, they are the same as those in FIG.

In FIG. 6, the dummy bar 8 is skewed with respect to the transport direction (inclination with the roll axis C at an inclination angle δ in the horizontal direction), so that the dummy bar 8 is disposed adjacent to the dummy bar 8 in the width direction. positional relationship between the distance sensor 2A _U and the distance sensor 2B _U for detecting the distance to the sensor 2A and the distance sensor 2B of the N-th pair of rolls of the upper roll La (N) is
For example, when the distance sensor 2A _U detects the minimum distance information J _XUM to the upper roll La (N), the distance sensor 2B _U
There distance to the detection of the minimum distance information J _{Y UM} to upper roll La (N) becomes X. Note that the distance X is perpendicular to the roll axis C.

[0049] Figure 7 is a distance sensor 2A _U, 2B _U is the minimum distance information J _XuM, the time difference to detect the J _YUM (to) characteristic diagram. 7, the time at which the dummy bar 8 the distance sensor 2A _U is transported detects a minimum distance information J _XuM to upper roll La (N) of the N-th roll pair and t1, the distance sensors 2B _U minimum distance information The time when J _YUM is detected is t
When 2, the time difference to the distance sensor 2A _U is from the detection of the minimum distance information J _XuM a distance sensor 2B _U detects a minimum distance information J _YUM becomes (t2-t1). In the roll distance measuring device 1, the distance sensor 2 </ b> A _U detects the minimum distance information J.
And _XUM the detected time t1, the distance sensors 2B _U minimum distance information J _YUM the detected time t2 Metropolitan from the time difference-to (= t
2-t1) is calculated. Since the time difference to has been determined,
When the transfer speed V of the dummy bar 8 is determined, the distance X shown in FIG. 6 is uniquely determined.

FIG. 8 shows that the distance sensors 2A _U are Nth and N + 1.
Minimum distance information J of the third upper roll La (N, N + 1)
_It is a time difference (T) characteristic diagram which detects _XUM . 8, the distance sensor 2A _U is the minimum distance information time of detecting the J _XuM to upper roll La (N) of the N-th roll pair and T1, followed by (N + 1) th upper roll L of roll pairs
_Assuming that the time when the minimum distance information J _XUM up to a (N + 1) is detected is T2, the distance sensor 2A _U
The time difference T transported from (N) to the upper roll La (N + 1) is (T2-T1).

Assuming that the roll installation design pitch of the Nth roll pair and the (N + 1) th roll pair is P, the distance sensor 2A
The transfer speed V of the dummy bar 8 on which _U is arranged is expressed by Expression 3 from the roll installation design pitch P and the time difference T.

[0052]

## EQU3 ## V = P / T

In equation (3), the transfer speed V of the dummy bar 8 is calculated from the ratio of the roll installation design pitch P to the time difference T.
It can be applied to rotational speed V _X of either the drive rolls of the upper roll of the roll pair La (N) or lower roll Lb (N) in place of the transport speed V.

The distance X shown in FIG. 6 is calculated from Equation 4 by multiplying the transfer speed V of Equation 3 by the time difference to.

[0055]

X = V * to

[0056] Since the number 4 from the distance X is calculated, the inclination angle δ indicating the distance sensor 2A _U and the distance sensor 2B distance between _U sensor interval S, be calculated from Equation 5 by using the distance X 6 Can be.

[0057]

Δ = sin ⁻¹ (X / S)

When the inclination angle δ of the dummy bar 8 is calculated,
From the distance sensor 2A _U, virtual sensor interval S _A distance sensor 2B _U to an intersection of the roll axis C and distances X are orthogonal, the distance sensor 2A _U and the distance the distance sensor spacing S between the sensor 2B _U
Is multiplied by the cosine value cos δ of the inclination angle δ, and is calculated from Expression 6.

[0059]

S _A = S * cos δ

[0060] Thus, even when obliquely with respect dummy bar 8 transport direction, a distance sensor 2A adjacent _U, 2B _U minimum distance information J, respectively to the upper roll La (N)
_XUM , the time difference to detect the minimum distance information J _YUM , and the distance sensor 2A _U having the Nth and (N + 1) th upper rolls La
(N), the virtual sensor interval S _A is calculated from the time difference T until the minimum distance information J _XUM to the upper roll La (N + 1) is detected, the roll installation design pitch P, and the roll interval S, and the inclination angle δ is calculated. Can be corrected.

Next, the inclination angle θ _R about the longitudinal axis of the dummy bar 8 is determined by the distance sensors 2A _U and 2B _U which are arranged adjacent to each other in the width direction of the dummy bar 8 as shown in FIG.
Of the Nth roll pair detected by each of the upper rolls L
Based on the minimum distance information J _XUM and J _YUM up to a (N) and the virtual sensor interval S _A calculated in _Equation 6, it can be calculated from _Equation 1 and is represented by _Equation 7.

[0062]

[ _Equation 7] Tilt angle θ _R = tan ^-1 (J _YUM −J _XUM ) / S _A

[0063] If the inclination angle theta _R a longitudinal axis around the dummy bar 8 is calculated, among the pair of distance sensors 2A disposed opposite and below the dummy bar 8, the distance sensor 2A _U is N th detecting The minimum distance information J _XUM to the upper roll La (N) of the roll pair and the lower roll Lb (N) of the Nth roll pair detected by the distance sensor 2A _D at the same timing as the detection of the minimum distance information J _XUM. The true roll interval L can be calculated from Equation 2 based on the distance information J _XD of

[0064]

L = (J _XUM + J _XD ) * cos θ _R

As described above, even if the dummy bar 8 is skewed in the transport direction (inclination angle δ in the horizontal direction with respect to the roll axis C) and further inclined about the longitudinal axis by the inclination angle θ _R , the adjacent distances sensor 2A _U, 2B _U each upper roll La
Minimum distance information J _XuM up (N), the minimum distance information J _YUM deviation (= J _YUM -J _XUM), calculates the inclination angle theta _R from the virtual sensor interval S _A, and the inclination angle theta _R, the distance sensor 2A is to compensate for the inclination angle theta _R and a minimum distance information J _{XU M} and distance information J _XD detected can be calculated true roll spacing L.

In this embodiment, the distance sensor 2A _U and the distance sensor 2B _U are used for calculating the time difference to, and the distance for detecting the distance information to the upper roll La (N) of the distance sensor 2A _U is used for calculating the time difference T. Using a sensor, the lower roll L
a distance sensor 2A _D for detecting distance information up to b (N);
It can also be used 2B _D.

FIG. 9 is an operation flow chart of the method for measuring the roll interval of the continuous casting equipment according to the second aspect. When the dummy bar is transferred to the roll pair, the roll interval measuring device 1 is initialized (initialized). In step P1, the distance sensor interval S between the distance sensors 2A and 2B disposed on the dummy bar 8 and the preset roll The Nth and N + 1th roll installation design pitches P arranged in the cavity are stored.

Next, in step P2, the distance adjacent sensors 2A _U and the distance sensor 2B minimum distance information J of the _U to the upper roll La (N) of any roll pair to be detected
_XuM, time for detecting the J _YUM t1, difference from t2 time to
(= T2−t1) is calculated.

[0069] Then, in step P3, one of the distance sensors 2A _U or distance sensor 2B _U next to each other (distance in Figure 8 sensors 2A _U) is, N-th and (N + 1) th upper roll La (N), upper roll The time difference T from the times T1 and T2 for detecting the minimum distance information J _XUM to La (N + 1)
(= T2-T1) is calculated.

In step P4, the ratio of the roll installation design pitch P and the time difference T stored in advance is calculated, and the transfer speed V of the dummy bar 8 is calculated.

[0071] Incidentally, instead of the process of calculating the moving speed V of the steps 3 and 4, can be applied rotational speed V _X of the drive roll of preset roll pair.

[0072] At step P5, multiplied by the time difference to the moving speed V of the dummy bar 8, the minimum one of the distance sensors 2A _U of adjacent distance information J _XuM other distance sensor 2B _U minimum distance information upon detection of the The distance X shown in FIG. 6 of the dummy bar 8 for detecting J _YUM is calculated.

Subsequently, in step P6, the inclination angle δ shown in FIG. 6 is calculated from the distance sensor interval S stored in advance and the distance X calculated in step P5, and the cosine value of the distance sensor interval S and the inclination angle δ is calculated. The virtual sensor interval S _A is calculated by multiplying cos δ.

In step P7, the deviation ΔJ between the minimum distance information J _XUM and J _YUM detected in step 2 (= J _YUM −
J _XUM ) and the virtual sensor interval S _A are calculated to calculate the inclination angle θ _R of the dummy bar 8 around the longitudinal axis.

Next, in step P8, the minimum distance information J _XuM to opposing pair of distance sensors 2A of the distance sensor 2A _U is detected upper roll La (N), and detecting a minimum distance information J _{X UM} Distance sensor 2 at the same time as
Distance information J to lower roll Lb of B _U is detected (N)
By multiplying the cosine value cos [theta] _R of the inclination angle theta _R to the sum of the _XD calculating a true roll spacing L.

In step P9, the calculated true roll interval L is compared with a preset roll interval allowable value L _K ,
If the true roll interval L is within the range of the allowable value L _K , the normal roll is determined. On the other hand, if the true roll interval L is out of the range of the allowable value L _K, an abnormality is determined. The deviation between the interval L and the permissible value L _K (= L−L _K ) is recorded.

Then, from step S2 to step S10
Is repeated from the first roll pair to the last roll pair of the roll group 9, and the determination of normal or abnormal for each roll pair is made based on the deviation between the true roll interval L and the allowable value L _K (= L−L _K ).
And display it on a display or printer.

As described above, according to the roll spacing measuring method of the continuous casting equipment according to the second aspect, the step P1 of storing the spacing (S) of the adjacent distance sensors and the Nth and (N + 1) th roll installation design pitches (P). Step P2 of calculating a time difference (to) when adjacent distance sensors detect respective minimum distance information (J _XDM , J _YDM ) to the lower roll (or upper roll) of an arbitrary roll pair; Step P3 of calculating a time difference (T) until one of the distance sensors detects the minimum distance information (J _XUM ) to the _{Nth and} (N + 1) th upper rolls (or lower rolls);
Step P for calculating the ratio of the roll installation design pitch (P) to the time difference (T) to obtain the transfer speed (V) of the dummy bar 8
4, a step P5 of calculating the distance (X) by multiplying the transfer speed (V) and the time difference (to), and calculating the inclination angle δ of the dummy bar 8 skewed from the distance sensor interval (S) and the distance (X). Step P6 which can calculate and further calculate the virtual sensor interval (S _A ) from the distance sensor interval (S) and the inclination angle δ, the minimum distance information (J _XUM , J _YUM ) and the virtual sensor interval (S _A ) P7 that can calculate the inclination angle θ _R of the dummy bar 8 around the longitudinal axis from the minimum distance information (J _XUM ) detected by one of the opposed distance sensors
(J _XUM + J _XD ) of the distance information (J _XD ) detected by the other distance sensor at the same timing as when the minimum distance information (J _XUM ) is detected, and the cosine value (cos θ) of the inclination angle θ _{R R} 8) to calculate the true roll interval (L), and multiplying the true roll interval (L) by comparing the multiplied true roll interval (L) with a preset roll interval allowable value (L _K ). Step P9 for determining whether the roll interval (L) is normal or not, and when the true roll interval (L) is out of the allowable roll interval (L _K ), the true roll interval (L) is determined. A step P10 of recording a deviation (L−L _K ) of the tolerance (L _K ), even if the dummy bar is skewed with respect to the transfer direction and transferred while being inclined about the longitudinal axis. The true roll spacing of all of the groups can be calculated.

[0079]

As described above, in the method for measuring the roll interval of the continuous casting equipment according to the first aspect, the step 1 of storing the interval (S) of the distance sensors arranged on the dummy bar;
The distance information (J _XU , J _XD ) to an upper roll and a lower roll of an arbitrary roll pair is continuously detected at predetermined timings by the distance sensors facing up and down, and the detected distance information (J _XU , Step 2 for storing J _XD )
And the deviation (ΔJ = J _XDM −) of the minimum distance information (J _XDM , J _YDM ) to the lower roll (or upper roll) of an arbitrary roll pair detected by the adjacent distance sensor.
_JYDM ) is divided by the distance sensor interval (S) to calculate the inclination angle (θ _R ), and the lower roll (or upper side) of a predetermined roll pair detected by one of the distance sensors facing each other. Minimum distance information to roll) (J _XDM )
At the same timing when the minimum distance information (J _XDM ) is detected, and the distance information (J _XU ) to the upper roll (or lower roll) of the predetermined roll pair detected by the other distance sensor. Cosine value of angle (θ _R ) (cos θ _R )
To calculate the true roll interval (L) by multiplying
Even if the dummy bar is transported inclined with respect to the longitudinal axis, it is possible to calculate all true roll intervals of the roll group, and to calculate the roll interval with a simple calculation and a short working time. Can be.

Further, according to the method for measuring the roll interval of the continuous casting equipment according to the second aspect, the distance (S) between the adjacent distance sensors,
Step 1 for storing the N-th and (N + 1) -th roll installation design pitches (P), and the adjacent distance sensors respectively providing the minimum distance information (J _XDM ) to the lower roll (or upper roll) of an arbitrary roll pair. , J _YDM ) to calculate the time difference (to), and one of the distance sensors detects the minimum distance information (J _XUM ) to the _{Nth and} (N + 1) th upper rolls (or lower rolls). Step 3 for calculating the time difference (T) up to, and calculating the ratio between the roll installation design pitch (P) and the time difference (T) to calculate the dummy bar 8.
Step 4 for calculating the transfer speed (V) of the data, Step 5 for calculating the distance (X) by multiplying the transfer speed (V) and the time difference (to), and calculating the distance from the distance sensor interval (S) and the distance (X). The virtual sensor interval (S) is calculated from the distance sensor interval (S) and the tilt angle δ.
_A ) that can calculate _A ), and 7 that can calculate the inclination angle θ _R around the longitudinal axis of the dummy bar 8 from the minimum distance information (J _XUM , J _YUM ) and the virtual sensor interval (S _A ). And the minimum distance information (J _XUM ) detected by one of the opposed distance sensors and the distance information (J _XD ) detected by the other distance sensor at the same timing as when the minimum distance information (J _XUM ) is detected. the sum of (J _XUM + J _XD) to the cosine value of the inclination angle θ _R (cosθ _R) multiplied to the a step 8 of calculating the true roll distance (L), and skew dummy bar is relative to the transport direction In addition, even in the case where the roll is transported while being inclined about the longitudinal axis, the true roll intervals of all the roll groups can be calculated, and the roll intervals can be measured with a simple calculation and in a short working time.

Further, in the method for measuring the roll interval of the continuous casting equipment according to claim 3, a preset rotation speed (V) _X of the drive roll of the roll pair is applied instead of the transfer speed (V) of the dummy bar. Therefore, the operation can be further simplified.

Therefore, it is possible to provide a method for measuring the roll interval of a continuous casting facility which has good work efficiency and is economical.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of one embodiment of a continuous casting facility to which a method for measuring a roll interval of the continuous casting facility according to the present invention is applied.

FIG. 2 is a layout diagram of a distance sensor on a dummy bar.

FIG. 3 is an explanatory view of a method of measuring a roll interval of the continuous casting equipment according to claim 1.

FIG. 4 is a diagram illustrating the calculation of the inclination angle θ _R

FIG. 5 is an operation flowchart of the method for measuring the roll interval of the continuous casting equipment according to claim 1.

FIG. 6 is an explanatory diagram of a method of measuring a roll interval of a continuous casting facility according to claim 2;

[7] The distance sensor 2A _U, 2B _U minimum distance information J _XuM, the time difference to detect the J _YUM (to) characteristic diagram

FIG. 8 is a time difference (T) characteristic diagram in which the distance sensor 2A _U detects the minimum distance information J _XUM of the N-th and (N + 1) -th upper rolls La (N, N + 1).

FIG. 9 is an operation flow chart of the method for measuring the roll interval of the continuous casting equipment according to claim 2;

FIG. 10 shows an embodiment of a conventional roll interval measuring device.

FIG. 11 is an explanatory diagram of measurement of a pair of rolls facing each other.

[Explanation of symbols]

1. Roll interval measuring device, 2A, 2A _U , 2A _D , 2B,
_{2B U, 2B D, 2C,} 2C U, 2C D ... distance sensor, 8 ...
Dummy bar, 8a to 8i: bent section, 9: roll group, 11
... Data processing unit, 12 Data operation unit, 13 Data storage unit, 14 Judgment unit, 15 Display unit, L (= L _U + L _D )
... Roll interval, La (N) ... Upper roll, Lb (N) ...
Lower _{roll, L U, X U, Y} U, the distance to the Z _U ... upper roll _{La, L D, X D,} Y D, the distance to the Z _D ... lower roll _{Lb, J XU, J XD,} J _YU , _JYD , _JZU , _JZD ... distance information,
_{J XUM, J XDM, J YUM} , J YDM ... minimum distance information, P ... roll installation design pitch, S ... distance sensor spacing, S _A ... virtual Sansa intervals, to, T ... time difference, V ... transport velocity, V _X ... Roll rotation speed, X: distance, θ _R : inclination angle around the longitudinal axis,
δ is the angle of inclination with respect to the roll axis.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B22D 11/16 104 B22D 11/08

Claims (3)

(57) [Claims] 1. A roll interval between a plurality of pairs of rolls, which sandwiches a slab to be drawn from a mold and transfers the slab along a predetermined path, is set above and below a dummy bar transferred prior to the slab, and the width of the dummy bar is adjusted. In a roll spacing measuring method of a continuous casting facility, which calculates based on distance information to the roll pair detected by a plurality of distance sensors arranged at predetermined intervals in a direction, even when the dummy bar is inclined around a longitudinal axis, Measuring the true roll spacing in the step (c). Step 1: The distance sensor interval (S) of the distance sensors arranged on the dummy bar is stored. Step 2: The distance information (J _XU , J _XD ) to the upper roll and the lower roll of an arbitrary roll pair is continuously detected at predetermined timing by the distance sensors facing up and down, and the detected distance information ( J _XU , J _XD ) are stored. Step 3: Deviation (ΔJ = J) of each minimum distance information (J _XDM , J _YDM ) to the lower roll (or upper roll) of an arbitrary roll pair detected by the adjacent distance sensor
_{XDM- JYDM} ) is divided by the distance sensor interval (S) to calculate the inclination angle (θ _R ). Step 4: Lower roll (or upper roll) of a predetermined roll pair detected by any of the opposed distance sensors
Minimum distance information (J _XDM), distance information to the minimum distance information (J _XDM) given roll pair of upper roll detected by the other distance sensor at the same timing of detection (or, lower roll) to (J _XU ) and the angle of inclination (θ
_R ) is multiplied by the cosine value (cos θ _R ) to calculate the true roll interval (L). 2. The method according to claim 1, wherein a plurality of pairs of rolls for nipping a slab to be drawn from the mold and transferring the slab along a predetermined path are positioned above and below a dummy bar transferred prior to the slab. A roll interval measuring method for a continuous casting facility, which calculates based on distance information to the roll pair detected by a plurality of distance sensors arranged at predetermined intervals in a direction, wherein the dummy bar is skewed with respect to a transfer direction (to the roll axis). Tilt angle δ) and tilt around the longitudinal axis (tilt angle θ _R )
A method of measuring the roll interval of a continuous casting facility, wherein the true roll interval is measured in the following steps even when the roll interval is determined. Step 1: The distance sensor spacing (S) of the distance sensors arranged on the dummy bar and the Nth and (N + 1) th roll installation design pitches (P) arranged in the roll cavity are stored. Step 2: Time difference (to) when adjacent distance sensors detect the minimum distance information (J _XUM , J _YUM ) to the upper roll (or lower roll) of an arbitrary roll pair
Is calculated. Step 3: One of the adjacent distance sensors is
Minimum distance information between Nth and N + 1th rolls (J _XUM )
Is calculated, the time difference (T) between the rolls is calculated. Step 4: The ratio of the roll installation design pitch (P) and the time difference between the rolls (T) is calculated to transfer the dummy bar (V).
Is calculated. Step 5: Time difference (t) in transfer speed (V) of dummy bar
o) multiplied by, calculates the distance to the dummy bar and the other of the distance sensor when one detects the minimum distance information (J _XuM) distance adjacent sensor detects the minimum distance information (J _YUM) (X) I do. Step 6: The inclination angle δ of the skewed dummy bar is calculated from the distance sensor interval (S) and the distance (X), and the virtual sensor interval (S _A ) is calculated from the distance sensor interval (S) and the cosine value (cos δ) of the inclination angle δ. ) Is calculated. Step 7: The deviation of each of the minimum distance information (J _XUM , J _YUM ) detected in Step 2 is determined by the virtual sensor interval (S _A ).
To calculate the inclination angle (θR) of the dummy bar around the longitudinal axis. Step 8: Upper roll (or lower roll) of a given pair of rolls detected by any of the opposed distance sensors
The minimum distance information to (J _XuM), distance information to the lower roll of the minimum distance information (J _XuM) given roll pair detected by the other distance sensor at the same timing of detection (or, upper roll) (J _XD ) and the angle of inclination (θ
_R ) is multiplied by the cosine value (cos θ _R ) to calculate a true roll interval (L). 3. The continuous casting facility according to claim 2, wherein a preset rotation speed (V _X ) of the drive roll of the pair of rolls is applied instead of the transfer speed (V) in Steps 3 and 4. Roll interval measurement method.