JPS63285409A - Roll profile measuring apparatus - Google Patents

Abstract

PURPOSE:To measure a roll profile accurately without depending on mechanical errors in the distortion and gradient of a guide, by moving a detector frame having three detectors along longitudinally a roll body. CONSTITUTION:A detector frame 9 carrying three detectors 6, 7 and 8 for gaps between rolls moves along longitudinally by a roll body through a guide 10. Gaps measured with the detectors 6, 7 and 8 are represented by (a), (b) and (c). Roll profile and gradient and distortion of the guides 9 and 10 are calculated by computation from measurement signals of the gaps (a), (b) and (c). This enables correction of the roll profile without depending on mechanical errors in the distortion and gradient of the guide, which unavoidably raises a problem in off-line/on-line operations.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a roll profile measuring device using an inter-roll gap detector. [Prior Art] As shown in Fig. 3, a roll profile measurement device that has been commonly used in the past moves a detector 1 that detects the gap to the roll surface along a guide 2, and measures the amount of the gap. The roll profile is measured from the change in
No. 07, JP-A-58-92807, etc. are well known.

[Problem that the invention seeks to solve]

In the prior art, it is difficult to accurately measure the roll profile due to the slope of the guide 2 due to the misalignment of the mounting position between the detector drive base 3 and the top surface of the roll chock 4 shown in FIG. 3, or the deflection of the guide 2 due to its own weight. could not.

FIG. 4 shows the deviation of the amount of roll displacement with respect to the length of the roll body. In particular, online, even if the detector pedestal 3 is attached to the chock 4 with high accuracy, the attachment may become misaligned over time due to impacts such as when the rolled material is caught, making it difficult to continuously measure the correct roll profile. It cannot be implemented.

The present invention aims to improve this type of problem.

[Means to solve the problem]

In the present invention, at least three or more inter-roll gap detectors are installed in the same circumferential direction as the roll, and each of the detectors is installed with its detection surface facing the roll center axis, and each of the detectors is
At the same time, the roll can be moved in the longitudinal direction along the guide,
This makes it possible to apply it online, which was not possible with conventional techniques.

The difference between the present invention and the conventional roll profile measuring device is that, instead of the detector 1 shown in FIG. 3, a detector stand on which three detectors are arranged is moved in the length direction of the roll body.

FIG. 1 shows a cross section of a roll and a detector which is an embodiment of the present invention. The detector pedestal 9 carries three inter-roll gap detectors i6, 7.8 and moves along the guide 10 in the roll cylinder length direction. The gap amounts measured by the detectors 6, 7.8 are denoted as a, b, and c. In the present invention, a, b, c
From the measurement signal of the roll profile and guides 9 and 10
The slope and amount of deflection are calculated by calculation. The calculation method will be explained below with reference to FIG.

FIG. 2 shows how the position of the guide shifts when the detectors 6 and 7 move along the guide. The solid line is the reference position, and the broken line indicates the detector position shifted along the movement. aQwl)Ill is the measurement signal of the gap detector at the reference position; a.

b is the gap detector signal during movement. Between the two, a=ao+x+rcosθa °°(1)b=b
o+x+rcosθb (2) Oa: Angle between the roll normal to the detector 6 and the moving direction of the guide cross section, Ob: An angle between the roll normal to the detector 7 and the moving direction of the guide cross section.

rThe amount of deviation of the guide cross section from the reference position due to the slope and sag of the guide.

X: Height change amount with respect to the reference position of the roll profile, The relationship holds true.

Although not shown in FIG. 2, similarly, for the detector 8, c:c(1+x+rcosθcel(3)co:
The following holds true: gap detector signal at the reference position, C: gap detector signal during movement, θC: angle between the roll normal to the detector 8 and the moving direction of the guide cross section. Here, θa, θb, and θC are not independent, and θ
C=θa+δ1...(4) θC=θa+δ
2...(5) δ1: Detector 6 shown in Figure 1
．． Angle between 7 and δ2: An angle between detectors 6 and 8 shown in FIG.

There is a relationship between However, for the purpose of measuring the roll profile, it is assumed that the measurement lines of the detectors 6, 7, and 8 pass through the center of the roll and are perpendicular to the roll surface.

Substituting equations (4) and (5) into equations (1), (2), and (3), we get a−a(3=x+(rcos(la)
”(6)b-bo=x+(rcosOa)sin
δ1-(rsinOa)sinδt...(7)c-C
Q =x+(rcosOa)sinδ2-(rsinO
a) sin δ2''·(8).

Furthermore, if T represents transposition and is written in the form of an inverted vector, Tr = (a, b, c) + Tta = (aa * b
o*co)Tz=(x, rcosOa, rsin
Oa) and can be expressed as AX=rr, . . . (9).

This simultaneous linear equation can be solved only when I A I =sin(δ1-52)≠0 (11 represents an inverted equation), and using equation (g), 3
Based on the measurement signals of the detectors, X, that is, the amount of height displacement of the roll profile
It becomes possible to measure cos θa and r sin Oa.

〔Effect of the invention〕

According to the present invention, it is possible to correct the roll profile without relying on mechanical errors in guide deflection and slope, which are problems when offline/online. As a result, the guide that was previously adjusted correctly offline,
Problems such as misalignment and inability to perform measurements when online have been resolved, and when installing the guide itself, as long as it is straight, there is no need for excessive installation precision; This makes it easier to maintain.

[Brief explanation of the drawing]

FIG. 1 shows the components of the present invention. Figure 3 shows a side view of a detector pedestal with three detectors and a cross-sectional view of the roll. FIG. 2 shows the slope of the guide in the measuring device of the present invention,
FIG. 7 is a side view showing the positional deviation of the detectors 6 and 7 due to deflection or the like. FIG. 3 is a front view showing an example of a conventional roll profile meter. FIG. 4 is a graph showing an example of measurement using a conventional roll profile meter. 1: Gap detector 2 Guide 3: Detector drive stand
5: Roll 4: Roll chock 6: Gap detector 1
7: Gap detector 8: Gap detector 39: Detector stand 10 guide Figure 1 Figure 2

Claims (1)

[Claims] At least three or more inter-roll gap detectors are installed in the same circumferential direction as the roll, with the detection surfaces of each detector facing the roll center axis, and each of the detectors simultaneously moves along the guide to the roll cylinder. A roll profile measuring device that can be moved in the longitudinal direction.