JPH01254360A - Apparatus and method for measuring roll alignment and roll interval - Google Patents

Abstract

PURPOSE:To quicken measurement and to improve safety by arranging an angle gage and one pair of displacement gages to a reference standard of length satisfying the specific condition and shifting the reference standard stored in a frame in passage of a cast slab. CONSTITUTION:The reference standard 1 sliding along a line of outside guide rolls 2 is fitted to the frame 5, and the angle gage 4 is fitted to the center part thereof. Then, the length (l) of linear plane part of the guide gage 1 is made so as to satisfy the inequality I. Further, elastic body 8 is set between the reference standard 1 and an inner roll pushing plate 7 and the displacement gages 9, 10 for outside guide roll and for inner side guide roll. The reference standard 1 is shifted in the passage of the cast slab between the rolls together with the frame 5, and at the same time, interval between the guide rolls and angle between the rolls are measured with the displacement gages 9, 10 and the angle gage 4. By simplifying the work, the measurement is quickened and the stability of the measuring work is improved.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a device for measuring roll alignment and roll spacing of a group of support rolls constituting a continuous casting machine, and a method for measuring using the device. .

(Prior art) For example, in a curved continuous casting machine, the slab pulled out of the mold reaches a group of support rolls arranged in an approximately 1/4 arc shape, and is guided and moved while being supported by the group of support rolls. Then, spray water is injected from the U-ru gap to cool it down.

The support roll group has an arc shape and consists of a roll group located inside the slab pulled out from the mold and a roll group located outside the mold, and the slab moves between these two opposing roll groups. However, when operating continuous casting (hereinafter abbreviated as "continuous casting"), the most important issues are roll alignment of the roll group and roll management to maintain an appropriate distance between rolls facing each other in the thickness direction of the slab. In other words, each roll group must be aligned so that the envelope of the slab contact point on each roll in the inner roll group and the outer roll group forms an arc with no irregularities, and this roll alignment may not be set properly. Or, if the distance between the opposing rolls deviates from the appropriate value, various defects such as internal cracks and axial center cracks may occur in the slab, which has unsolidified molten steel inside and is at a high temperature and has a low solidified shell strength. , which causes significant problems in terms of slab quality. This roll alignment and roll spacing are due to roll wear and
It easily fluctuates due to rattling. For this reason, it is necessary to actually measure the roll alignment or roll spacing, determine the deviation of the point of contact with the slab from the design reference position for each roll, and quickly correct the roll position.

Accordingly, various apparatuses and methods for measuring roll alignment, in particular of roll alignment and roll spacing, have been proposed and put into practice. An example is shown below.

■ A method in which a worker enters the roll cavity during non-casting, presses the standard R gauge against the outer roll, and measures the gap between the roll and the R gauge using a feeler gauge.

(2) A device that measures roll alignment using the same coordinate transformation of the roll apex coordinates (Japanese Patent Application Laid-Open No. 151515/1984, etc.).

In other words, since it is not possible to measure all the roll vertices of a roll group at the same time, roll alignment for all rolls is determined by measuring several rolls at a time, piecing together the measurement results, and converting them to the same coordinates. be.

■ The base sliding plate, the inclination angle meter installed on the reference sliding plate, the roll position detection switch installed on both ends of the base V sliding plate, and the control switch placed in the middle position of the roll position detection switch. A roll alignment measuring device (Japanese Patent Publication No. 16544/1983).

(Problems to be Solved by the Invention) However, the above-described devices and methods each have the following problems.

Regarding method ①, the work environment is poor as the roll cavity is a place of high temperature and high humidity, and there are many unsafe elements as the work is done in a narrow space surrounded by rolls, and accidents such as workers falling. It's happening a lot.

Furthermore, as mentioned above, this is a manual operation in a narrow space, and there are problems with measurement accuracy, such as variations in measured values depending on the operator.

Regarding the device (2), when determining roll alignment by performing measurements and coordinate transformations about 10 times for several rolls, each measurement value is influenced by the measurement values of neighboring rolls, and measurement errors are added to each coordinate transformation. , are multiplied and accumulated, so there is a maximum of about 300 between the most upstream roll and the most downstream roll of the roll group.
There is a possibility that a conversion error of mm may occur, and strict control of roll alignment cannot be expected at all.

Regarding the device (2), in this roll alignment measuring device, in order to determine whether the measured values are valid or not, the measured values are discarded using the logic shown in Figure 8 in Japanese Patent Publication No. 59-16544. However, such logic requires three position detection switches for position determination, making the configuration complicated.

In addition, to prevent erroneous measurements when the roll pitch is small (
3 rolls (7j: To prevent erroneous measurements when slight sliding is applied), in addition to two roll position detection switches, a control switch is installed in the center, but when the center roll is normal, Although erroneous measurements can be prevented,
If the center roll shown to a foreigner is in a concave state, the 9th
There is a problem of erroneous measurements because it is indistinguishable from the case where the roll pitch is large as shown in Figure B.

The present invention aims to provide a roll alignment and roll spacing measuring device and measuring method that can solve the above-mentioned problems.

(Means for Solving the Problems) In order to achieve the above object, the present invention measures the roll alignment and roll spacing of the slab passage of a continuous casting machine, which is composed of slab guide rolls arranged in pairs. (i) a reference gauge having a linear plane with a length l that satisfies PsAx≦a<3・P,4IN; (ii) the reference gauge so that the reference gauge conforms to and touches the guide roll row; (iii) an elastic body that presses the gauge directly or a frame to which the reference gauge is attached against the guide roll row with the required force, and (iii) is attached to the reference gauge and measures the vertical angle or the equivalent inclination angle made by the reference gauge. (iv) a roll to be measured that is installed near the tip or rear end of the reference gauge with respect to the moving direction of the mount, and in contact with the reference gauge with reference to the reference gauge or a fixed point of the mount, and a pair thereof; a pair of displacement meters for measuring the distance between the two rolls; and (v) a data storage device for collecting and storing data from the angle meter and the displacement meter. The value that minimizes the sum of the displacement meter outputs for the guide rolls is determined as the roll spacing of the guide rolls, and with this time point as the reference, the angle value measured after or before a certain period of time is the guide that the reference gauge contacts. Roll alignment and roll spacing are measured by determining the inclination angle formed by two rolls: a roll and a guide roll adjacent to the guide roll.

(Function) In the present invention, when measuring the pass line of a slab passage in continuous casting equipment formed by slab guide rolls arranged in pairs, an elastic body is used to press against the guide rolls. using a stand configured such that the reference gauge moved in the slab passage while contacting two guide rolls of the guide roll group, and an angle meter disposed on the reference gauge disposed on the stand; and a pair of displacement meters to measure the inclination angle and roll interval of the reference gauge.

(Example) The present invention will be described below based on an example not shown in the accompanying drawings.

FIG. 1 shows an embodiment of a measuring device according to the present invention, in which (a) shows a front view and (b) shows a bottom view.

In FIG. 1, l is a reference gauge having a linear plane that slides along the two rows of outer guide rolls, and at the front and rear ends of the reference gauge 1 are provided to prevent the reference gauge 1 from hitting the outer guide roll 2. A guide section 3 is provided. In addition,
The length of this reference gauge 1 must be within a certain range, and this length will be explained in detail below.

Reference numeral 4 denotes an angle meter which is disposed at, for example, the center position of the reference gauge 1 and measures the vertical angle or an equivalent inclination angle of the reference gauge 1, and is not susceptible to the effects of vibrations that occur when the device is moved, for example. Servo-type angle meters, etc. are used.

5 indicates the reference gauge 1 in the vertical direction shown in FIG. 1(A);
In other words, it is a pedestal mounted so as to be movable in the direction toward and away from two rows of outer guide rolls, and an inner roll pressing plate 7 is fixedly arranged on the side of this pedestal 5 opposite to the reference gauge 1, that is, on the side of the 6th row of inner guide rolls. ing.

Between the reference gauge 1 and the inner roll pressing plate 1, there is an elastic body such as a pressing spring 8, which presses the reference gauge 1 and the inner roll pressing plate 7 against the outer and inner guide rolls 2.7 with a required force, respectively. These reference gauges are also interposed
For example, on the tip side of the inner roll pressing plate 7, an outer guide roll displacement meter 9 and an inner guide roll displacement meter are installed to measure the distance from the reference gauge 1 or the pedestal 5 to the outer guide roll 2 or the inner guide roll 6, respectively. IO are installed in pairs. As these displacement meters 9 and 10, any suitable device such as a differential transformer, laser distance meter, linear scale, or magne scale may be used as long as the distance can be measured.

In FIG. 1, reference numeral 11 indicates a stopper that limits the maximum amount of expansion of the pressing spring 8, 12 indicates a portion for fixing the pressing spring 8 to the pedestal 5, and 13 indicates a portion for fixing the displacement meter 9.10 to the pedestal 5. .

Further, although the data storage device is not shown, it may be incorporated into the pedestal 5, but since the pedestal 5 is narrow, it may be configured to be led out from the pedestal 5 via a separate lead wire.

The device of the present invention is constructed as described above, and can be attached to a part of a dummy bar, or inserted alone into the pass line of a slab passage in continuous casting equipment when not in casting mode to perform measurements.

The following describes how to attach it to a dummy pad and insert it from below for measurement.

As shown in FIG. 2, the roll interval between the first outer guide roll 2 and the first outer guide roll 2 is DI, and the distance between the first outer guide roll 2 and the first outer guide roll 2 is DI. ．． 2i. Let the vertical angle of the first pass line be θI, and the roll pitch of the first and 1+1th lines be Pl.

Generally, >D, , >D, ◆2・θ electric〈θτ・1, so the inclination angle θ and the roll distance measured at the time of insertion behave as shown in FIG. 3.

That is, the measurement target outer guide roll 2 of the reference gauge 1
Since the output of the angle meter 4 behaves as shown in Fig. 3 depending on the contact situation with the
That is, it is necessary for the reference gauge 1 shown in FIG. 4(a) to be placed on the guide rolls 21.3.28.2 on both sides and to take in the output in a stable position.

Incidentally, drawings corresponding to periods A to E in FIG. 3 are shown in FIGS. 4(A) to 4(E).

The solution to this problem is roll spacing measurements.
The point in time (time T in FIG. 3) when the sum of the measured values of the roll spacing shown in FIG. ) is used as a reference, and the inclination angle θ is preferably taken in after a certain period of time T has elapsed. This fixed time T is the average processing of the device insertion speed V, the length β from the displacement meter 9.10 position to the end position of the reference gauge 1, the maximum roll pitch P□8, and the measured angle value θ1. Limited by number of times.

In addition, since the measured angle value θ1 is the average of the values measured N times for each tN′″$, it is obtained as follows, tH = 10 to 1000. N = 1 to 10
It's about the same amount of time.

At this time, T is ■ It is necessary to meet the following conditions.

Furthermore, the length l of the reference gauge 1 is limited by the maximum value P, AX, and minimum value P HIN of the roll pitch, and in the normal measurement method described above, 2 P WIN > l ≧ P MAX It is necessary to meet the following conditions.

However, as shown in FIG. 5, the displacement gauges 9 and 10 are placed at two locations 9I, 92 and 10. ．． 10□ Attach or change the value of T according to the roll pitch design value,
That is, by decreasing the value of T for a large roll pitch and increasing it for a small roll pitch, it is possible to extend the limit to the condition 3 PMIN > p≧P, ^.

In this example, the roll spacing measurement value shown in FIG. 3, that is, the point in time (the third Although we have shown an example in which the inclination angle θ is taken after a certain period of time T has elapsed from the time T in the figure as a reference, it is also possible to adopt a method of taking in the inclination angle θ around 1 before the elapse of a certain time T. . In other words, the inclination angle θ formed by the two rolls is based on the timing of capturing the roll interval measurement value.
It takes in.

(Effects of the Invention) As explained above, according to the present invention, the reference gauge stored in the pedestal and the roll pressing plate can be moved in the slab passage while being in contact with the surfaces of the paired rolls of the continuous casting machine. This makes it possible to safely, quickly, and accurately measure roll alignment and roll spacing, which have a major effect on internal cracking and center segregation, which are particularly problematic during high-speed casting, using a device with a simple configuration.

Therefore, there is no need for workers to enter the narrow slab passageway to take measurements as in the past, improving safety and measurement accuracy.
In addition, it has excellent effects such as improving the quality of slabs through thorough equipment management.

In addition, if the 7 alignments of the inner guide roll are also required, they may have the same structure as the outer guide roll. That is, the inner roll pressing plate may be replaced with a reference gauge and an angle meter may be provided.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of the measuring device according to the present invention, (a) is a front view, (b) is a bottom view, and Fig. 2 is an explanation of the guide roll interval and the vertical angle of the outer guide roll. figure,
Figure 3 is a drawing showing the output value of the inclination angle and the output value of the roll spacing when the guide rolls pass, and Figures 4 (A) to (E).
3 is an explanatory diagram of the contact state of the reference gauge to the guide roll corresponding to the period A-H shown in FIG. 3, and FIG. 5 is an explanatory diagram of the case where displacement meters are attached at two locations. ■ is the reference gauge, 2 is the outer guide roll, 4 is the angle meter,
5 is a frame, 6 is an inner guide roll, 8 is a pressing spring, 9.
10 is a displacement meter. Figure 1 (a) Base case 5 (b)

Claims (2)

[Claims] (1) Roll alignment of the slab passage of a continuous casting machine consisting of slab guide rolls arranged in pairs;
In a device for measuring roll spacing, (i) P_M_A_X≦l<3・P_M_I_N However,
P_M_A_X: Maximum value of roll pitch to be measured P_M_
I_X:〃Minimum value l: A reference gauge having a linear plane with a length l that satisfies the reference gauge length; an elastic body that presses the pedestal on which the gauge is attached against the guide roll row with a required force; (iii) an angle meter that is attached to the reference gauge and measures the vertical angle made by the reference gauge or an inclination angle equivalent thereto; iv) The distance between the roll to be measured, which is installed near the tip or near the rear end of the reference gauge with respect to the moving direction of the mount, and which the reference gauge touches with reference to the reference gauge or a fixed point of the mount, and the roll that forms a pair with it. A roll alignment characterized by comprising: a pair of displacement meters for measuring; (v) a data storage device for collecting and storing data from the angle meter and the displacement meter;
Roll spacing measuring device. (2) Using the measuring device according to claim 1, the value at which the sum of the displacement meter outputs for a pair of guide rolls is the minimum is determined as the roll interval of the guide rolls, and a certain period of time has elapsed with this time point as a reference. A method for measuring roll alignment and roll spacing, characterized in that the angle value measured before or after is determined as the inclination angle formed by two rolls: a guide roll in contact with a reference gauge and a guide roll adjacent to the guide roll.