JP2012045608A - Roll gap measuring device and roll gap measuring method for continuous casting facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for saving labor and time required for measuring and inputting an amount of claw abrasion loss.SOLUTION: A roll gap measuring device for a continuous casting facility includes a nipping type sensor mounted on a dummy bar of a continuous casting facility and comprises a new claw locus storing means, an abraded claw locus storing means, a claw abrasion correction value computing means and a measured roll gap value outputting means. The new claw locus storing means stores the locus of a measured roll gap value measured with a new claw at the first time of measurement together with operating conditions. The abraded claw locus storing means stores the locus of measured roll gap values measured at the second and subsequent times of measurement without changing the claw under the same operating conditions as that at the first time of measurement. The claw abrasion correction value computing means corrects the stored locus so as to make it similar to the locus of the measured roll gap values stored by the new claw locus storing means and obtain the claw abrasion correction value from the difference between the minimum values before and after the correction of the measured roll gap values stored by the abraded claw locus storing means. The measured roll gap value outputting means outputs the value obtained by correcting the minimum value of the measured roll gap stored by the abraded claw locus storing means, as a measured roll gap value.

Description

  The present invention relates to a roll interval measuring device and a roll interval measuring method for measuring a minimum value of a roll interval between opposing rolls that are continuously arranged in a continuous casting facility to form a slab passage, that is, a distance between opposing rolls, In particular, the present invention relates to a roll interval measuring device and a roll interval measuring method for automatically correcting the wear of a claw (contactor) that is in sliding contact with the roll.

  In continuous casting equipment, opposing rolls are continuously arranged to form a slab passage between the rolls. The roll spacing after the secondary cooling zone optimizes the load applied to the solidified shell, and abnormal solidification ( It is an important management item to prevent bulging and cracking of the slab.

  In a conventional general measurement method for measuring the roll interval, a dummy bar that guides a slab to a slab passage between continuous rolls from a mold at the start of casting is sandwiched between opposing rolls and slid onto those rolls. A crab pinching sensor that continuously measures the distance between rolls along the roll surface from the swing angle between two arcuate claws that are in contact with each other and the distance between the rolls from the output signal of the sensor Equipped with a roll interval measuring device that has a transmitter etc. that calculates the minimum value of this and transmits it as a roll interval measurement value to a higher-level data collection device, and transmits when this dummy bar is inserted into the mold away from the dummy barker The roll interval measuring device is activated by the change in the attitude of the tilt switch provided in the machine and starts measurement, and then the dummy bar moves through the slab path between successive rolls. During and are, roll distance measuring device measures each roll distance by the method described above, are transmitted to the data collection device of the upper (for example, see Patent Document 1).

  By the way, the two claws of the crab-clamping sensor are positioned in a direction perpendicular to the roll axis while being slidably in contact with the opposing rolls when continuously measuring the distance between the rolls along the roll surface. In order to move, while the roll interval measurement is performed by moving the slab passage between successive rolls, and further, the roll interval measurement of the entire slab passage is repeated, and the wear gradually increases. Therefore, conventionally, in the data collection device, for the roll interval measurement value transmitted from the transmitter of the roll interval measurement device, the nail wear amount is corrected using the nail wear correction value that is manually input in advance, The corrected value is the true roll interval measurement value.

JP 2004-37089 A

  However, with the above-described nail wear correction method using manual input settings, the amount of nail wear must be measured and manually input to the data collection device before each roll interval measurement, which requires a great amount of labor and time. is required. For this reason, a method of simply estimating the amount of nail wear per time and adding each measurement was tried, but the amount of nail wear is not uniform, so the actual nail wear amount and the estimated value are If they are different, it becomes a big problem. Therefore, in the past, the amount of nail wear is measured and corrected manually by manual input in a periodic repair performed once every one to two months.

  The present invention has been made paying attention to the above-described circumstances, and provides a technique for obtaining the wear amount of the nail during the roll interval measurement and automatically correcting the roll interval measurement value.

In order to solve the above-mentioned problems, the inventor conducted sincerity studies focusing on the behavior of the measured value of the distance between rolls during measurement, and completed the present invention.
That is, the present invention advantageously solves the above-mentioned problems, and the technical idea of the present invention is that the two arc-shaped claws (contacts) sandwiched between opposing rolls and slidably contact with the rolls. A new nail is attached to a crab pinching type sensor that measures the distance between rolls from the swing angle, and the trace of the measured value of the distance between rolls measured under a certain operating condition is stored, and the nail that wears in sequence Correct the trajectory of the measured distance between the rolls measured in step 1 so that it is similar to the trajectory of the new nail stored when measured under the same operating conditions, and adjust the minimum value before correction and the minimum value after correction. This difference is used as a nail wear correction value.

  The roll interval measuring device of the continuous casting equipment of the present invention based on such technical idea is mounted on a dummy bar that is inserted into a slab passage between opposing rolls continuously arranged in the continuous casting equipment and guides the slab, While the dummy bar moves through the slab passage, the distance between the opposing rolls is determined by the swing angle between the two arcuate claws that are sandwiched between the opposing rolls and are in sliding contact with the rolls. The crab pinching type sensor that continuously measures and outputs the calculated value and the minimum value of the distance between the rolls that is continuously output when the crab pinching type sensor passes between the opposing rolls. And a processing unit for outputting a roll interval measurement value obtained based on the roll interval measuring device of a continuous casting facility, wherein the arithmetic processing unit includes a new nail attached to the crab pinching sensor. A new claw trajectory storage means for storing a trajectory of a measured value of the distance between rolls measured at the second time together with an operation condition at the time of measurement, and the crab sandwiching type sensor under the same operation condition as the operation condition of the first measurement. The wear claw trajectory storage means for storing the trajectory of the measured value of the distance between rolls measured after the second time without changing the claw, and the trajectory of the measured value of the distance between rolls stored in the wear claw trajectory storage means. The correction is made to be similar to the measurement value trajectory of the distance between rolls stored in the new claw trajectory storage means, and before the correction of the measurement value of the distance between rolls stored in the wear claw trajectory storage means. The nail wear correction value calculating means for obtaining the difference between the minimum value and the corrected minimum value to obtain the nail wear correction value, and the opposite roll measured by the crab pinching sensor after the second time without changing the nail Is said wear Roll interval measurement value output means for outputting, as a roll interval measurement value, a value obtained by correcting the minimum value of the measured value of the distance between rolls stored in the trajectory storage means with the nail wear correction value. .

  In the roll interval measuring apparatus for continuous casting equipment according to the present invention, the calculation processing means may be provided on the data collection device side without being mounted on the dummy bar, but the calculation processing means is also mounted on the dummy bar. Then, since the conventional data collection device can be used as it is, it is more preferable.

  Further, the roll interval measuring method of the continuous casting equipment of the present invention based on the above technical idea is a dummy bar inserted into a slab passage between opposing rolls continuously arranged in the continuous casting equipment to guide the slab. While the dummy bar moves through the slab passage, the distance between the opposing rolls is determined by the swing angle between the two arcuate claws that are sandwiched between the opposing rolls and are in sliding contact with the rolls. It is equipped with a crab pinching type sensor that continuously measures and outputs along the line, and obtains the minimum value of the distance between the rolls that is continuously output when the crab pinching type sensor passes between the opposing rolls. In the roll interval measurement method for continuous casting equipment that obtains the roll interval measurement value based on the measured value, the trajectory of the measured value of the distance between the rolls measured by the crab pinching sensor with a new nail is measured for the first time. And the trajectory of the measured value of the distance between the rolls measured after the second time without replacing the claw under the same operating condition as the operating condition of the first measurement. The stored locus of the measured value of the distance between rolls memorized after the second time is corrected so as to be similar to the locus of the measured value of the distance between rolls memorized after the first time. And the difference between the minimum value before correction and the minimum value after correction of the measured value of the distance between rolls measured and stored after the second time is used as the nail wear correction value, and the crab pinching sensor For the opposing rolls measured after the second time without changing the nail, a value obtained by correcting the measured value of the distance between the rolls measured after the second time and stored with the nail wear correction value is stored. It is characterized by the roll interval measurement value. To have.

  According to the present invention, without changing the claw (contact), the trajectory of the measured value of the distance between the rolls measured with the claw that gradually wears, the roll between the rolls of the new claw measured under the same operating conditions. Correcting the distance measurement value to resemble the trajectory distorted by wear, correcting the trajectory distorted by wear, and measuring the gap between rolls using the difference between the minimum value before correction and the minimum value after correction as the nail wear correction value The amount of nail wear is calculated and the nail wear correction is automatically performed to obtain an accurate roll interval measurement value, so that a great amount of labor and time required for measuring and inputting the nail wear amount can be saved. . In addition, since the change with time of the nail wear amount can be visually understood, the nail replacement time can be estimated, so that the operability and maintainability of the continuous casting facility can be greatly improved.

1 shows an embodiment in which the roll gap measuring device and the roll gap measuring method of the present invention are applied to an actual continuous casting facility. It is a block diagram which shows the electrical structure of the roll clearance measuring apparatus of the said Example together with the other apparatus related to it. (A), (b) is the side view and top view which illustrate the arrangement configuration of each part of the roll clearance measuring apparatus of the said Example mounted in the dummy bar. It is a flowchart which shows the action | operation of the roll clearance measuring apparatus of the said Example with the action | operation of the data collection apparatus relevant to it. (A) is the trajectory of the measured distance between rolls with a new nail, (b) is the trajectory of the measured distance between rolls measured with a nail worn under the same operating conditions, and (c) is the trajectory of (b). Is a corrected trajectory obtained by correcting the arc into an arc shape similar to the trajectory of (a).

  FIG. 1 shows an embodiment in which the roll gap measuring device and the roll gap measuring method of the present invention are applied to an actual continuous casting facility. In FIG. 1, reference numeral 1 denotes a mold in which molten steel from a tundish (not shown) flows down, and a continuous slab is formed by primary cooling of the molten steel in the mold 1. The inside of the slab passage formed by a plurality of pairs of left and right rolls arranged continuously below the mold 1 is guided in an arc shape.

  The slab passage is formed by a plurality of segments 4 including a plurality of pairs (for example, six pairs) of non-driven guide rolls 2 and a pair of pinch rolls 3 that are rotationally driven by an electric motor (not shown). Since the pinch roll 3 is in contact with the surface of the slab, the slab is moved continuously. In this continuous casting facility, a chain-like multi-joint dummy bar 5 is inserted into the slab passage from the upper surface side of the mold 1 at the start of casting.

  The dummy bar 5 is transported to the immediate vicinity of the mold 1 by the dummy barker 6 and is inserted into the mold 1 from here. The dummy bars 5 inserted into the slab passage from the mold 1 are sequentially moved while being held by the pinch rolls 3 between the opposing guide rolls 2. For example, a roll interval measuring device 7 for measuring the roll interval between the opposing guide rolls 2 is mounted on the dummy bar 5 at an intermediate portion thereof.

  For this roll interval measuring device 7, a known roll interval measuring device can be applied. For example, as shown in FIG. 2, the roll interval is measured at both ends and the central portion of the rolls 2 and 3, respectively. Three crab pinching sensors 8, a tilt sensor (not shown) that detects the tilt of the dummy bar 5, and a transmitter 9 including a control device (not shown) including a normal microcomputer, a data collection device 20 and a transmitter 9 described later , A power supply box 11 incorporating a battery (not shown) that feeds power to the transmitter 9, an electromagnetic coupler 12 that feeds power from the data collection device 20 to the power box 11, and a transmitter 9 And a relay connector box 13 for connecting the three crab pinching sensors 8 to each other.

  Here, the crab pinching type sensor 8 for measuring the roll interval is a publicly known sensor, for example, as shown in FIG. 3 (a), having swinging claws 8a each having an arcuate shape. By opening and closing by contact with the roll, the relative rotation angle of the other of the claws 8a with respect to the other is detected by, for example, a detection unit 8b configured by an absolute encoder or the like. Since this rotation angle changes according to the distance between each roll, a roll space | interval can be detected from this rotation angle.

  The transmitter 9 incorporating the control device corresponding to the arithmetic processing means sequentially detects the roll interval from the output signal of the detection unit 8b, and the nail wear of the nail (contactor) 8a that wears in contact with the roll. Correction is performed and the data is transmitted to the host data collection device 20. The data collection device 20 has a roll NO. The roll interval measurement result from the roll interval measuring device 7 is linked (associated) to the data, and the data is transmitted to the host computer 30. The electric device 40 outputs the position of the dummy bar 5 and the speed information of the pinch roll 3 to the data collection device 20.

  The roll gap measuring method according to the above embodiment implemented by the roll gap measuring apparatus according to the above embodiment configured in the continuous casting equipment will be described below with reference to FIGS. 4 and 5.

  First, a new claw 8a is attached to each of the three crab pinching sensors 8, and the measurement by the new claw is declared (operation input) by the data collection device 20, and the measurement is started. FIG. 4 mainly shows the operation of the roll interval measuring device. The operation of the roll interval measuring device 7 is started when the tilt sensor is tilted and turned on when the dummy bar 5 is inserted into the mold 1 ( Step S1), the transmitter 9 of the roll interval measuring device 7 transmits the fact that the measurement is being performed to the data collecting device 20 after the start of operation, and inquires of the data collecting device 20 whether or not the measurement is performed with a new nail. The measurement data is cleared and the NO. Prepare for measurement of one roll (step S2). Then, whether or not the new nail is measured by the data collection device 20 and NO. Whether or not the measurement is for one roll is received. When the measurement is for one roll (step S3) and the measurement is performed with a new nail (step S4), the nail wear correction value is cleared to zero (step S5), and the subsequent processing is performed.

  Normally, the claw 8a of the crab pinching type sensor 8 is initially opened to the maximum and is closed by sliding contact with the surface of the roll 2 or roll 3, so the maximum value of the distance between the rolls is first detected. Next, the minimum value is detected. The transmitter 9 of the roll interval measuring device 7 stores the trajectory of the series of inter-roll distance measurement values (step S6), and this minimum value is determined as NO. The roll interval measurement value for one roll is stored and transmitted to the data collection device 20 (step S7). Therefore, the transmitter 9 that executes Step S6 corresponds to a new nail locus storage means. In the data collection device 20, the transmitted roll interval measurement value is set to NO. It is linked (associated) with one roll and transmitted to the host computer 30. Operation conditions during one roll measurement, such as pinch roll speed, MD (mold) thickness (measurement thickness), and roll gap set value are stored.

  This is the second measurement after replacement with a new nail. In the measurement of 2 rolls, the transmitter 9 of the roll interval measuring device 7 continuously receives the measured distance between rolls from the crab pinching sensor 8 and stores the trajectory of the measured distance between rolls. In addition, the minimum value is set to NO. It calculates as a roll space | interval measured value of 2 rolls (step S8). Therefore, the transmitter 9 that executes Step S8 corresponds to a wear claw locus storage unit. The transmitter 9 further has a current operation condition of NO. 1 in the first measurement after replacement with a new nail. The data collection device 20 is inquired as to whether or not the operating conditions of one roll are the same, and the data collection device 20 determines whether the current operation conditions are NO. In the first measurement after replacement with a new nail. It is transmitted to the transmitter 9 whether or not the operating conditions are the same for one roll.

  The current operating condition is NO. In the first measurement after replacement with a new nail. If the operating condition is the same as that for one roll (step S9), the transmitter 9 of the roll interval measuring device 7 is set to NO. The trajectory of the measured distance between the rolls of the two rolls is corrected, the roll interval measured value is obtained from the minimum value of the corrected trajectory, and the NO. This NO. The nail wear correction value is obtained by subtracting the roll interval measurement value of the two rolls. By adding this nail wear correction value to the roll interval measurement value of the two rolls, the roll interval measurement value after nail wear correction is obtained and transmitted to the data collection device 20 (step S10). Therefore, the transmitter 9 that executes step S10 corresponds to nail wear correction value calculation means and roll interval measurement value output means.

  The roll NO. In the measurement after replacement with a new nail is obtained. 3 and thereafter, the transmitter 9 of the roll interval measuring device 7 similarly continuously receives the measured distance between rolls from the crab pinching sensor 8 and determines the minimum value of the measured distance between rolls as the roll interval. Calculated as a measurement value, adds the nail wear correction value obtained in step S10 to the roll interval measurement value to obtain the roll interval measurement value after nail wear correction, and transmits it to the data collection device 20 (step S11). ) Is repeated until the tilt sensor returns to the OFF state.

  NO. In the second and subsequent measurements after replacement with a new nail. 1 roll measurement, i.e., NO. When measuring one roll, the transmitter 9 of the roll interval measuring device 7 skips steps S4 to S5, S6, and S7, and proceeds to step S8. 8 is continuously received and the trajectory of the measured distance between rolls is stored, and the minimum value is set to NO. It is calculated as a roll interval measurement value for one roll (step S8). Therefore, the transmitter 9 that executes Step S8 corresponds to a wear claw locus storage unit. The transmitter 9 further has a roll No. in the first measurement after the current operating condition is replaced with a new nail. The data collection device 20 inquires whether or not the operation condition is the same as the operation condition of No. 1, and the data collection apparatus 20 determines whether the current operation condition is the roll No. in the first measurement after replacement with a new nail. 1 is transmitted to the transmitter 9 as to whether or not the operation condition is the same.

  The current operating condition is the roll No. in the first measurement after replacement with a new nail. 1 (step S9), the transmitter 9 of the roll interval measuring device 7 is connected to the current NO. The trajectory of the measured distance between rolls of one roll is corrected, the roll interval measured value is obtained from the minimum value of the corrected trajectory, and the first NO. The current NO. The nail wear correction value is obtained by subtracting the roll interval measurement value of one roll. By adding this nail wear correction value to the roll interval measurement value of one roll, the roll interval measurement value after nail wear correction is obtained and transmitted to the data collection device 20 (step S10). Therefore, the transmitter 9 that executes step S10 corresponds to nail wear correction value calculation means and roll interval measurement value output means. In step S9, the current operation condition is the roll No. in the first measurement after replacement with a new nail. If the operating conditions are not the same as those of the first operation condition, the transmitter 9 of the roll interval measuring device 7 continuously receives the measured distance between rolls from the crab sandwich sensor 8 for the subsequent rolls. The minimum value of the inter-distance measurement values is calculated as the roll interval measurement value, and the roll interval measurement value after nail wear correction is obtained by adding the nail wear correction value obtained in step S10 to the roll interval measurement value. The process of transmitting it to the data collection device 20 (step S11) is repeated until the tilt sensor returns to the OFF state.

  Next, after measurement for the first time after replacement with a new nail, when measuring with a worn nail, for example, the nail wear correction value is obtained by the method shown in FIG. I do. FIG. 5A shows the trajectory of the measured distance between rolls with respect to the movement distance of the actual roll distance measuring device measured with a new nail, and FIG. 5B shows the actual roll distance measured with a nail worn under the same operating conditions. It is a locus | trajectory of the distance measurement value between rolls with respect to the moving distance of a measuring apparatus. The locus of (b) is distorted in the vicinity of the minimum value due to claw wear, and if this is similar to the locus of (a), for example, corrected to an arc shape by an interpolation method or the like, a locus (c) after correction is obtained. The difference between the minimum value of the pre-correction trajectory and the minimum value of the post-correction trajectory was obtained, and this difference became the nail wear correction value, which was used for nail wear correction.

  The nail wear correction value based on the difference between the minimum value of the pre-correction trajectory and the minimum value of the post-correction trajectory described above was 0.7 mm, and the actually measured wear amount (length) was about 0.7 mm. Accordingly, it can be seen that the nail wear correction value is in good agreement with the actually measured wear amount, and a good result is obtained.

  Although the present invention has been described based on the illustrated examples, the present invention is not limited to the above-described examples, and can be appropriately changed within the scope of the claims. For example, the above-described normal crab sandwich type The claw 8a of the sensor 8 is supported at one end so as to be swingable and is urged in the expanding direction by the spring and pressed against the roll surface, so that the spring is most elastically deformed in a state where the minimum value is detected. Since the pressing force of 8a is maximized, the trajectory of the measured distance between the rolls seems to be distorted near the minimum value due to claw wear. If the structure of the crab pinching sensor is different, such as when the claw 8a is energized by electromagnetic force, the nail wear mode may also be different from the above, but even in that case, the measurement was performed with the worn nail according to the present invention. Low If corrected the trajectory between the distance measurement is similar to the trajectory of the inter-roll distance measurement value measured by the new nail, it is possible to obtain the pawl wear correction value to improve matching the amount of wear. Therefore, the crab pinching sensor in the present invention is not limited to the crab pinching sensor 8 of the above-described embodiment.

  In the above example, the control device incorporated in the transmitter 9 functions as a new nail locus storage means, a wear nail locus storage means, a nail wear correction value calculation means, and a roll interval measurement value output means. At least one of the above means may be included in a control device in which the roll interval measuring device 7 mounted on the dummy bar 5 is provided separately from the transmitter 9 or data collection fixed to the continuous casting facility The apparatus 20 may be included (in this case, the data collection apparatus 20 also functions as a part of the roll interval measuring apparatus).

  According to the present invention, in the measurement of the roll interval of the continuous casting equipment, the trajectory of the measured value of the distance between the rolls measured with the claw that gradually wears without replacing the claw (contact) of the crab pinching sensor. Is corrected so that it is similar to the locus of the measured distance between rolls with a new nail measured under the same operating conditions, the locus distorted by wear is corrected, and the minimum value before and after the correction are corrected. As the nail wear correction value, the nail wear amount is obtained during the roll interval measurement, and the nail wear correction is automatically performed to obtain the accurate roll interval measurement value. Can save a great deal of labor and time. In addition, since the change with time of the nail wear amount can be visually understood, the nail replacement time can be estimated, so that the operability and maintainability of the continuous casting facility can be greatly improved.

DESCRIPTION OF SYMBOLS 1 Mold 2 Guide roll 3 Pinch roll 4 Segment 5 Dummy bar 6 Dummy barker 7 Roll interval measuring device 8 Crab pinching type sensor 8a Claw 8b Detector 9 Transmitter 10 Radio 11 Power supply box 12 Electromagnetic coupler 13 Relay connector box 20 Data collection device 30 Host computer 40 Electric device

Claims (3)

Mounted on a dummy bar that is inserted into a slab path between opposing rolls arranged continuously in a continuous casting facility and guides the slab, and is sandwiched between opposing rolls while the dummy bar moves through the slab path. A crab pinching type sensor that continuously measures and outputs the distance between the opposing rolls from the rocking angle between the two arcuate claws that are in sliding contact with the roll of the roll, and the roll surface;
Arithmetic processing means for obtaining the minimum value of the distance between the rolls continuously output when the crab pinching type sensor passes between the opposing rolls, and outputting the roll interval measurement value obtained based on the minimum value;
In the continuous casting equipment roll interval measuring device comprising:
The arithmetic processing means includes:
A new nail trajectory storage means for storing a trajectory of a measured value of the distance between rolls measured first time by the crab pinching type sensor with a new nail, together with an operation condition at the time of the measurement;
Wear claw trajectory storage means for storing a trajectory of a measured value of a distance between rolls measured after the second time without replacing the claw by the crab pinching type sensor under the same operating condition as the operating condition of the first measurement,
While correcting the measurement value locus of the distance between rolls stored in the wear claw locus storage means to be similar to the measurement value locus of the distance between rolls stored in the new nail locus storage means, Nail wear correction value calculation means for obtaining a difference between the minimum value before correction and the minimum value after correction of the measured value of the distance between rolls stored in the wear nail locus storage means, and making it a nail wear correction value;
For the opposing rolls measured by the crab pinching type sensor after the second time without changing the claw, the minimum value of the measured distance between the rolls stored in the wear claw locus storage means is the claw wear correction value. Roll interval measurement value output means for outputting the corrected value as a roll interval measurement value;
A roll interval measuring device for continuous casting equipment, comprising:   2. The roll interval measuring device for continuous casting equipment according to claim 1, wherein said arithmetic processing means is also mounted on said dummy bar. Rolls inserted into the slab path between opposing rolls arranged continuously in the continuous casting facility and guided by the dummy bar that guides the slab, and sandwiched between the opposing rolls while the dummy bar moves through the slab path It is equipped with a crab pinching type sensor that continuously measures and outputs the distance between opposing rolls along the roll surface from the swing angle between the two arcuate claws that are in sliding contact with each other,
In the roll interval measuring method of a continuous casting facility that obtains the minimum value of the distance between rolls continuously output when the crab pinching type sensor passes between opposing rolls and obtains the roll interval measurement value based on the minimum value. ,
The crab pinching sensor stores the trajectory of the measured value of the distance between the rolls measured with the new nail for the first time together with the operation conditions at the time of the measurement,
The trajectory of the measured value of the distance between rolls measured after the second time without changing the claw by the crab pinching type sensor under the same operating condition as the operating condition of the first measurement,
The locus of the measured value of the distance between rolls measured and stored after the second time is corrected so as to be similar to the locus of the measured value of the distance between rolls measured and stored in the first time, The difference between the minimum value before correction and the minimum value after correction of the measured value of the distance between rolls measured and memorized after the second time is obtained as the nail wear correction value,
For the opposing rolls measured after the second time by the crab pinching type sensor without changing the nail, the measured value of the distance between the rolls measured and stored after the second time is stored as the nail wear correction value. A roll interval measurement method for continuous casting equipment, characterized in that the value corrected in step 1 is used as a roll interval measurement value.

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