JPS60256001A - Shape detecting apparatus - Google Patents

Abstract

PURPOSE:To effect stabilized shape detection of a surface of plate, by mounting a hollow multi-division rotor of nonmagnetic material provided with heat-resisting property so that a gap is maintanined by air injection between shaft and outerperiphery of the shaft. CONSTITUTION:On a hollow fixed shaft 1 a hollow multi-division rotor of heat- resistant and nonmagnetic material is mounted free to rotate in such a way that the required gap is maintained between the shaft and the outer periphery of the shaft 1. A number of injection holes 4 are perforated along the peripheral direction of the shaft 1 and air introduced under pressure to the inside of the shaft 1 is made to blow out from each holes 4 to form an air bearing with the aid of a cap 2 and a good conductive layer 5 is constructed on the inner surface of each rotor 3. Further, an eddy current system displacement-meters 6, 6 utilizing impedance changes are fixed on top and bottom position of the shaft 1 and wires connected with these meters 6, 6 are led to a computer 8 and then to a display apparatus 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a shape detector for detecting the surface shape of a rolled plate.

[Prior Art] A hollow multi-segmented roll method is known as one of the methods for detecting the shape of a rolled plate. That is, as shown in FIG. 1, a hollow rotor C, which is divided into multiple parts so as to form a required gap b between the outer periphery of the shaft a, is rotatably fitted on a hollow shaft a, and By drilling a large number of jet holes d in the circumferential direction of the shaft a and jetting air from inside the shaft a through each jet hole d, a so-called air bearing is formed by the gap b. , air pressure measurement holes e, e are provided at the upper and lower positions corresponding to each rotor C, and the air pressure measurement hole e
, e is a pipe f connected to an external static converter.
, f are connected by introducing them into the shaft a, and when the gap changes due to the shape of the plate running around the outer periphery of each rotor C, that change is reflected as a change in air pressure through the upper and lower air pressure measurement holes e, e,
It is sent to a pneumatic converter via pipes f and f, where it is converted into an electrical value and the plate shape is detected.

However, in a shape detector using such hollow multi-split roll cleaning, the rotor Q is made of metal, so when it receives heat from the rolled plate, it expands due to the gap b and the rotor C.
, C or even if the air supply pressure changes slightly, an error occurs in the detected pressure, making it impossible to accurately detect the shape, resulting in a stability problem.

In particular, when forming an air bearing, the inner and outer diameters of rotor C (7) should be approximately 300xm and 350mm.
When the width of the rotor C is about 75u+, the gap b between the rotor C and the axis a needs to be about 0.075u, and the gap between the rotors C and C needs to be about 0.15m5.

Now, when the 0-tor C is installed on the shaft a with a width of 1800+ am, 24 rotors C are installed, but at this time, the total gap between the rotors C and C must not be less than about 1.0-1. Then, the stability of 〇-ta C becomes worse. By the way, although it is necessary to form such an air bearing with strict precision, if the rotor C is made of iron-based metal, its linear expansion coefficient α is about 1.28×10 −5 . Therefore, when the temperature of rotor C increases by 40'C, the amount of thermal expansion δW in the width direction of rotor C is 6W = α-W-fl -1, 28X10i
X75X40-0.0384 an, 0.0 for 24 pieces.
It becomes about 921 gv, and the gap between ○-ta C and C disappears, and an air bearing is not formed. Gap b is -1x 300x 1,2 with temperature rise of 40℃
Since it expands by 8 x 10'5 x 40 - 0.07685 m, the effect of temperature rise on detection accuracy is very large.

Therefore, it is possible to detect the gap b between the rotor C and the shaft 8 by impedance change or actance change.
Especially in displacement meters that use eddy currents, if the rotor C is made of metal, eccentricity and uneven hardness will affect impedance and reactance, and the displacement meters are likely to interfere with each other via the rotor C. becomes.

[Problems to be Solved by the Invention] In view of the above circumstances, the present invention is designed to stably perform shape detection.

[Means for Solving the Problems] The shape detector of the present invention has a hollow polygon made of a heat-resistant non-magnetic material on the shaft so that a gap between the shaft and the outer periphery is maintained by blowing air. A split rotor is fitted, a good conductor is provided on the inner surface of each rotor, and a displacement meter that utilizes impedance change is installed on the shaft, and the plate shape can be detected by the output of the displacement meter. have

[Example] Hereinafter, the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 2 and 3, on a hollow fixed shaft 1,
To form a required gap 2 between the outer periphery of the shaft 1,
The hollow multi-segmented rotor 3 made of heat-resistant non-magnetic material can be rotated freely lol! At the same time, a large number of jet holes 4 are bored in the circumferential direction of the shaft 1, and air forced into the shaft 1 is blown out from each jet hole 4 to form an air bearing with the gap 2, and each of the rotors A good conductor 5 is installed on the inner surface of 3.
Also, eddy current type displacement meters 6, 6 that utilize impedance changes are attached to the upper and lower positions of the shaft 1, and the wiring 7 connected to the displacement meters 6, 6 is led to the calculation M8, and the calculation! Connect the display device 9 to the i8.

For the rotor 3, it is preferable to use a non-magnetic resin having heat resistance, for example, using carbon fiber such as carbon fiber with little unevenness in hardness and little temperature change. As the good conductor 5, copper, aluminum, or metal can be used, and M! 1,
It can be provided by plating, inserting, pasting, etc.

Note that the thickness may be about 0.11.

When the shape detector thus configured is brought into contact with the rolled plate 11 coming out of the rolling mill 1110 with a required pressing force as shown in FIG. 4, the surface shape of the rolled plate 11 can be detected. That is, when the surface shape of the rolled plate 11 is flat, the gap 2 between each rotor 3 and the shaft 1 is maintained constant, but when the surface shape is not flat, the convex portion partially covers the row 93. Press down. When the rotor 3 is pushed down, the gap 2 at that portion changes, and based on this, the impedance changes between the displacement gauges 6, 6 and the good conductor 5, and the generated eddy current changes. Therefore, the value is sent to the calculator 8, and the calculation result is sent to the display 9 and displayed as the shape of the rolled plate 11 in the width direction. In this case, the change in the gap 2 can be measured using only the upper displacement meter 6, but by using the upper and lower displacement meters 6.6, the relative difference can be determined, and the accuracy is further improved.

In the above, since each rotor 3 is made of a heat-resistant non-magnetic material such as carbon fiber, the rolled plate 1
There is almost no thermal influence from 1, and the permittivity of good conductor 5 does not change even if it receives heat, and even if the air supply pressure changes slightly, air pressure is not used to measure gap 2. Therefore, detected values can be obtained accurately and stably.

FIG. 5 shows another embodiment of the present invention. In the embodiment described above, a good conductor 5 was provided on the entire inner circumference of the rotor 3, but in this embodiment, insensitive members 12 (cuts) were provided on the entire surface at appropriate intervals. notch)
is formed. Note that the length of the dead zone 12 is preferably about three times the diameter of the displacement meter 6.6.

In the case of this method, the gap 2 at the absolute position can be measured using a change in impedance, reactance, etc. as a trigger. That is, the measurement position of the rotor 3 after t seconds can be determined based on the position of the dead zone 12.

By detecting the shape in this manner, for example, even if the rotor 3 is eccentric during manufacturing, the influence of the eccentricity can be removed.

In the above, when using a non-magnetic resin containing carbon fibers for the rotor 3, if the carbon fibers are exposed on the surface, there is a risk of damaging the rolled plate, so it is necessary to apply chrome plating, etc., for example. There is. Also, when carbon fiber is included in epoxy resin, for example, the specific weight is 2000 km-
Since the weight can be reduced to about 100%, it is possible to make a rotor that is about 2/7 lighter than an iron-based rotor. Alternatively, if the air supply pressure is kept constant, an air bearing with high load resistance can be obtained.

It should be noted that the present invention is not limited only to the above-mentioned embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

[Effects of the Invention] As explained above, according to the shape detector of the present invention, accurate and stable shape detection can be performed without being influenced by heat from a rolled plate or fluctuations in air pressure. , it can produce excellent effects.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of a conventional shape detector using the hollow multi-segmented roll method, Fig. 2 is an explanatory diagram showing a partially broken shape detector of the present invention, and Fig. 3 is an explanatory diagram of the shape detector of the present invention. Cross-sectional view of the detector,
FIG. 4 is an explanatory diagram of the state of use, and FIG. 5 is a sectional view of another embodiment of the present invention. 1 is a shaft, 2 is a gap, 3 is a rotor, 4 is a jet hole, 5 is a good conductor, 6 is a displacement gauge, 11 is a rolled plate, and 12 is a dead zone. Patent application Hitoshi Kawajima Harima Heavy Industries Co., Ltd. Figure 2 Figure 4 Figure 5

Claims (1)

[Claims] 1) A hollow multi-segmented rotor made of heat-resistant non-magnetic material is fitted on the shaft so that a dark gap with the outer periphery of the shaft is maintained by blowing air, and a good conductor is provided on the inner surface of each rotor. A shape detector, further comprising: a displacement meter that utilizes impedance change provided on the shaft, and a plate shape that can be detected by the output of the displacement meter.