JPH0560585A - Multi-function sensor between stands - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a multi-function sensor suitable for installation between finishing stands of a hot rolling mill. [Structure] A U-shaped sensor holder 8 is installed between the stands of a finishing stand so that it can be freely taken in and out, an X-ray generator 14a is attached to its upper frame 8a, and an X-ray generator is attached to its lower frame 8b.
The line detector 14b is attached to measure the central plate thickness of the strip, and three pairs of two-dimensional laser rangefinders 15, 16 and 17 are attached to the left and right of the X-ray generator 14a at predetermined intervals so that both ends of the strip are positioned. The height of the strip by mounting a one-dimensional laser distance meter 18 back and forth at the same position as the X-ray generator 14a and measuring the plate height of the strip, and further by mounting a speed sensor 19 on the lower frame 8b. By measuring, it is possible to measure the strip thickness, strip width, shape, etc. at the same time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inter-stand multi-function sensor installed between finishing stands of a hot rolling mill.

[0002]

2. Description of the Related Art Conventionally, when a strip is rolled by a hot rolling mill, not only various dimensions such as strip thickness, strip width and crown but also flatness, shape of camber and degree of meandering Since it has a great influence on the product quality, the rolling position and roll bender are controlled during the rolling process to maintain the desired accuracy. Therefore, it is essential to measure the shape and dimensions of the strip during rolling.

That is, for example, in controlling the strip thickness, the strip thickness is measured using an X-ray thickness gauge installed on the delivery side of the rolling mill, the deviation from the target strip thickness is obtained, and this strip thickness deviation is fed back. A so-called BISRA type AGC or the like is often used in which the rolling reduction is performed. Regarding the plate width, for example, a plate width meter using an image sensor, a meandering sensor, or a camber meter is used, which contributes to maintaining the quality of the strip.

[0004]

By the way, in recent years, prompt control is required due to an increase in quality demands on strips, and the above-mentioned sensors are provided between the same stands as much as possible so that feedforward control and feedback control can be performed at the same time. Is requested. However, the environment between the stands is extremely poor because it is filled with strip coolant, steam, dust, oil mist, etc., and is narrow, so that the above-mentioned various sensors are installed on the downstream side of the final stand. It was normal.

As an example of installing a sensor between the stands so far, an example of installing an X-ray thickness gauge and using it for feedforward control (for example, "Steel and Steel" 77th year
(1991), No. 4, p. 528 to 535), or an example in which a meandering sensor is installed to perform meandering control (for example, "Ishikawajima Harima Technical Report", 1986, vol. 26, p. 35). However, in each of these, only one type of sensor is installed according to its purpose, and a multifunctional sensor that measures all the originally required information as described above is installed. It is not an example.

The present invention has been made in order to solve the problems of the prior art as described above, and provides a multi-functional sensor between stands that can be installed in a narrow environment even in a narrow stand. The purpose is to do.

[0007]

DISCLOSURE OF THE INVENTION The present invention is a multi-functional sensor between stands installed between finishing stands of a hot rolling mill, which is movable in a direction perpendicular to a strip pass line. A square-shaped sensor holder, an X-ray generator attached to the central portion of the upper frame of the sensor holder so as to correspond to the central portion of the strip, and an X-ray attached to the lower frame at a position facing the X-ray generator. An X-ray plate thickness gauge for measuring the central plate thickness of the strip, which comprises a line detector, and a one-dimensional laser for measuring the plate height of the strip, which is mounted back and forth at the same position as the X-ray generator of the upper frame. A distance meter and at least one pair of two-dimensional laser distance meters which are arranged at equal intervals on both sides of the X-ray generator to detect the end position of the strip, and the upper frame or the lower frame. Attached is in an interstand multifunction sensor, characterized in that comprising a speed sensor for measuring the traveling speed of the strip.

It should be noted that another pair of 2's are provided on the lower frame of the sensor holder at a position facing the two-dimensional laser rangefinder.
A dimensional laser range finder may be provided.

[0009]

[Operation] As a result of various experiments and studies for installing the multi-function sensor between the stands, the present inventors were able to obtain the following findings. In other words, a laser-type sensor is effective as a multifunctional sensor that simultaneously measures the plate width, meandering, and shape. However, when it is attempted to detect the plate edge part two-dimensionally using a laser type sensor, depending on the mounting location, for example, when the strip moves while the looper is lowered, the strip slides on the lower liner. However, when the strip is pressed against the rising portion of the entry side guide, there is a problem that the end of the strip cannot be identified. Therefore, it was found that the space that can be measured without this obstacle is limited to an extremely narrow range between the looper and the side guide. On the other hand, when measuring the plate thickness, an X-ray plate thickness gauge is usually used, and the X-ray generator and the X-ray detector are vertically arranged in a U-shaped sensor holder called a C frame with a pass line in between. It needs to be housed and placed, but it must be installed between the looper and the side guides, which creates a space constraint that it will be in the same position as the above-mentioned installation position of the multifunction sensor. .. Therefore, in order to install the X-ray thickness gauge and the multifunction sensor at the same position, the sensor holder that is usually used as the X-ray thickness gauge is shared, and only the upper frame is enlarged so that the multifunction sensor can be installed. It should be stored. As a result, it is possible to freely move in and out of the maintenance yard when changing rolls, etc., and it is possible to reliably maintain accuracy due to maintenance.

Therefore, according to the present invention, a two-dimensional laser range finder in which at least one pair of an X-ray plate thickness meter and a one-dimensional laser range finder is provided in a sensor holder having a C-frame structure which can be freely put in and taken out from a pass line, Since the multi-function sensor consisting of the speed sensor is housed integrally, in addition to measuring the plate thickness even between narrow stands, the plate width, meander, plate height and camber, steepness, plate crown, plate wedge, etc. It is possible to measure the shape at the same time and to measure all the information needed for strip quality control.

[0011]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a side view showing an embodiment of a sensor holder for accommodating the multifunction sensor of the present invention.
Is the A-A arrow view. In FIG. 1, reference numeral 1 is a rolling roll of, for example, a No. 5 stand, which is one before the final finishing stand, and is rotatably supported by the housing 2. 3 is a rolling roll of No. 6 stand, which is a final finishing stand, and is rotatably supported by the housing 4.
Reference numeral 6 is a looper that is provided on the exit side of the rolling roll 1 of the No. 5 stand and that can vertically move the strip from the surface of the pass line 5.

Numeral 7 is a side guide arranged on both sides of the pass line 5 on the entrance side of the rolling roll 3 of the No. 6 stand. Reference numeral 8 is a U-shaped sensor holder that accommodates the multifunction sensor arranged between the looper 6 and the side guide 7, 9 is a wheel for moving the sensor holder 8, and 10 is a pair of left and right rails. .. As shown in FIG. 2, the rail 10 is supported by columns 11 and laid from the drive side of the housing 4 to the maintenance yard 13. The sensor holder 8 is moved from the maintenance yard 13 to the center of the pass line 12 by a driving device (not shown). It can be taken in and out freely.

FIG. 3 is a partially cutaway side view of the sensor holder 8. In the figure, 14 is an X-ray plate thickness gauge for measuring the center plate thickness of the strip, and the upper frame 8
The X-ray generator 14a provided in a and the X-ray detector 14b provided in the lower frame 8b are arranged to face each other. 15 is
By detecting both ends of the strip, the width, meandering, camber,
This is a first two-dimensional laser range finder capable of measuring steepness and the like, and sensors 15a, 15 are provided on the left and right sides of the X-ray generator 14a.
The pair of b's are arranged at equal intervals so that the positions of both ends of the strip can be detected. Reference numeral 16 is a second two-dimensional laser range finder. Similarly, sensors 16 are provided on the left and right sides of the X-ray generator 14a.
A pair of a and 16b are arranged at equal intervals such that b (where b> a). Reference numeral 17 denotes a third two-dimensional laser range finder, which is similarly arranged as a pair of sensors 17a and 17b on the left and right of the X-ray generator 14a at equal intervals of c (where c> b). Here, the distance a between these two-dimensional laser rangefinders 15, 16, 17
The values of b and c are determined according to the strip width dimension of the rolled strip. The number of these two-dimensional laser rangefinders is three.
The number is not limited to a set, and may be increased, or conversely, a pair of right and left may be used by moving it according to the plate width by using an appropriate moving means.

Reference numeral 18 denotes a one-dimensional laser range finder capable of measuring the plate height (height of the looper 6) and the steepness of the central portion of the strip, which is the same as the X-ray generator 14a as shown in FIG. It is provided in the position. Reference numeral 19 denotes a speed sensor such as a laser Doppler speed meter, which is provided on the lower frame 8b, but may be mounted on the upper frame 8a if there is space. Reference numeral 20 denotes a terminal box that pools the wiring from each sensor and enables connection with external cables. twenty one
Is a counter weight, which acts to maintain the balance of the sensor holder 8.

Next, various dimensions by the two-dimensional laser range finder 15, the one-dimensional laser range finder 18, and the speed sensor 19, that is,
A method for measuring the plate width, the amount of meandering, the plate height, the flatness, the camber, the plate wave and the steepness thereof will be described with reference to FIG. Now, the left and right sensors 15a and 15b of the two-dimensional laser range finder 15 are 1
It is assumed that the two-dimensional laser range finder 18 is arranged at an interval of W ₀ , and the scanning distance is W _S.
The measurable range W by the three-dimensional laser range finder 15 is W = W ₀ +
The 2W _S. Further, the distance between the outer ends m and n of the measurable range W and the plate ends m ′ and n ′ of the strip P is ΔW, respectively.
₁ and ΔW ₂ , the measurement distance to the strip P by the one-dimensional laser range finder 18 is L ₀ , and the measurement distance to the strip P by each sensor 15a, 15b of the two-dimensional laser range finder 15 is L
₁ and L ₂ . (1) Measurement of the plate width _{W P: W P = W 0} + 2W S - (ΔW 1 + ΔW 2) = W- (ΔW 1 + ΔW 2) (2) Measurement of meandering amount _{Δx: Δx = ΔW 1 -ΔW 2} ( 3) Measurement of plate height L: L = L ₀ (4) Measurement of flatness δ: δ = {(L ₁ + L ₂ ) / 2} −L ₀ (5) Measurement of camber C: Strip by speed sensor 19 Since the amount of movement of P can be measured, it can be measured by tracking the change state of the meandering amount Δx in (2) in accordance with the amount of movement. (6) Measurement of plate wave and its steepness: The change in the distance L _{0 in} the case of abdominal extension and the change in the distances L ₁ and L _{2 in} the case of ear extension are monitored in correspondence with the movement amount of the strip P. Therefore, the steepness can be known as a matter of course.

In the above embodiment, the two-dimensional laser range finder 15 is described as being arranged on the upper frame 8a of the sensor holder 8, but the two-dimensional laser range finder is similarly arranged at the opposite position of the lower frame 8b. By doing so, it is possible to measure the plate crown and the plate wedge.

[0017]

As is apparent from the above description, according to the present invention, an X-ray plate thickness meter and a one-dimensional laser distance meter, at least a pair of two-dimensional laser distance meters, and a U-shaped sensor holder are further provided. Since the speed sensor is integrated, it is possible to construct a compact multifunctional sensor.
As a result, it is possible to install it between the finishing stands freely and collect all the information necessary for quality control of the strip, which greatly contributes to the improvement of product quality and yield.

Further, according to the present invention, since environmental measures for the sensor holder need only be concentrated on the local area near the sensor, the amount of purge air can be reduced, and equipment for draining mill spray water can be reduced. It is possible to

[Brief description of drawings]

FIG. 1 is a side view showing an installed state of a sensor holder that houses a multifunction sensor of the present invention.

FIG. 2 is a view on arrow AA of FIG.

FIG. 3 is a side view showing a sensor holder partially broken away.

FIG. 4 is a partially cutaway top view of the sensor holder.

FIG. 5 is a diagram illustrating a method of measuring various dimensions by the multifunction sensor of the present invention.

[Explanation of symbols]

 1,3 Rolling rolls 2,4 Housing 5 Pass line 6 Looper 7 Side guide 8 Sensor holder 10 Rail 14 X-ray plate thickness gauge 15, 16, 17 Two-dimensional laser distance meter 18 One-dimensional laser distance meter 19 Speed sensor

Claims (2)

[Claims] 1. A multi-functional sensor between stands installed between finishing stands of a hot rolling mill, the sensor holder having a U-shape that is movable in a direction perpendicular to a strip pass line. A strip comprising an X-ray generator attached to the center of the upper frame of the sensor holder so as to correspond to the center of the strip and an X-ray detector attached to the lower frame at a position facing the X-ray generator. An X-ray plate thickness meter for measuring the central plate thickness, a one-dimensional laser range finder for measuring the plate height of the strip, which is mounted back and forth at the same position as the X-ray generator of the upper frame to measure the plate height of the strip,
At least one pair of two-dimensional laser rangefinders arranged on both sides of the line generator to detect the end position of the strip, and a speed attached to the upper frame or the lower frame to measure the traveling speed of the strip. A multi-functional sensor between stands, comprising a sensor. 2. A plurality of stand-to-stand multi-units according to claim 1, wherein another pair of two-dimensional laser rangefinders is provided at a position facing the pair of two-dimensional laser rangefinders on the lower frame of the sensor holder. Function sensor.