JPH04350511A - Shape of metal strip detector and usage thereof - Google Patents

Abstract

PURPOSE:To prevent a deposit to a detection roll from being built up by providing a spray nozzle for injecting a washing water toward this surface and a brush roll for abrading the detection roll surface near a shape detection roll. CONSTITUTION:A spray nozzle 4 and a brush roll 5 are installed on front and rear surfaces of a lower portion of a shape-detection roll 3. The brush 5 can be in contact with or released from the roll 3 by an air cylinder 6 and is normally being released. A low-pressure water can be constantly injected from the nozzle 4 toward a surface of the roll 3 and a surface of the roll 3 is washed, thus preventing adhesion of a metal powder dust, etc. Detection values based on a displacement of the roll 3 which is divided into a plurality of portions in plate width direction of a metal strip 1 are compared for adjacent rolls 3. When a detection value which is different from adjacent values is obtained, it is regarded that there was a deposit of an adhered object, the cylinder 6 is activated, and the brush 5 is allowed to contact the roll 3, thus enabling the adhered object to be eliminated. While the brush 5 is in operation, an abnormal value may be detected. Therefore, no shape detection is performed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shape detection device in a continuous processing line for metal strips.

0002

BACKGROUND OF THE INVENTION Conventionally, as shown in Japanese Patent Publication No. 57-28890 and Japanese Patent Application Laid-Open No. 62-207906, a ring-shaped roll divided in the width direction of the metal strip is used in a continuous processing line for metal strips. The shape of a metal strip is detected by bringing it into contact with the metal strip and measuring its displacement.

[0003] Here, the shape of a metal strip refers to the state of length distribution obtained by dividing the metal strip in the width direction and measuring each section. Typical shape defects include selvage, selvage, There is some stretching etc. Figure 3 shows the special public service from 1984-28.
FIG. 4 is a diagram showing the overall configuration of the shape measuring device disclosed in Japanese Patent No. 890, FIG. 4 is a configuration diagram of the shape measuring device, and FIG. 5 is a diagram showing the principle of detection of the shape detecting roll. As can be seen in Figure 2, two transport rolls in a continuous processing line for metal strip 1, in this figure intermediate between deflector roll 2 and rolling roll 2', push the metal strip up to a slightly higher position than both rolls. A split roll 3 for shape measurement is installed.

In FIG. 3, a metal strip 1 having a shape distribution indicated by TD is pushed upward by a dividing roll 3.
The vertically downward reaction force due to the line tension of the metal strip 1 caused by this pushing up is detected as the displacement of the dividing roll for each division in the width direction of the metal strip 1 by the sensor 9, and converted into a load by the calculator 11. In addition, the eccentricity caused by the deflection of the shaft of the split roll 3 is calculated by the selector 1.
3 and is displayed on the display meter 14. FIG. 4 shows the principle of the detection part, in which the amount of displacement of the divided rolls differs depending on the length of the metal strip 1 in the width direction, and this is detected as a distance h by the lower sensor.

By the way, in a continuous processing line for metal strips, it is inevitable that metal powder generated within the line and dust entering from the surrounding environment adhere to the metal strips and the rolls in the line. There is no particular problem as long as the dust is of the type that detaches quickly after it adheres, but for example, zinc powder from galvanizing lines has strong adhesion and
They tend to grow in successive deposits, and if such deposits occur on the individual rings of the split roll, the thickness will cause an error in displacement detection, so even if there is no shape defect in the actual metal strip, it will be displayed. The meter will display a defect.
Performing corrective operations that were originally unnecessary may cause meandering or defective shapes in the metal strip.
In extreme cases, this results in the worst situation of constriction or strip breakage. Furthermore, the deposits themselves can cause scratches on the strip, causing defects.

[0006] For this reason, in an example of a continuous hot-dip galvanizing line for cold-rolled steel strips, line stoppages due to zinc adhesion occur once or twice a month, and the stoppage time due to maintenance of the detection roll is 5-7%. had also been reached. On the other hand, various roll wipers that use fluid pressure or mechanical scraping are known as means for cleaning line rolls in continuous processing lines for metal strips. It was necessary to interrupt the shape measurement and operate the machine intermittently, which led to a decrease in line efficiency.Additionally, if a margin was taken on the safety side, excessive cleaning was likely to occur.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to solve these problems and provide a means for preventing deposits from accumulating on the shape detection roll under optimal conditions without impairing line efficiency. shall be.

[0008]

[Means for Solving the Problems] The present invention provides a metal strip shape detection device comprising a shape detection roll divided in the strip width direction, in which a shape detection roll is provided near the shape detection roll.
It is characterized by the installation of a spray nozzle that sprays cleaning water toward the surface of the shape detection roll, and a brush roll that comes into contact with and polishes the surface of the shape detection roll.

[0009]

[Operation] According to the present invention, cleaning water is sprayed onto the surface of the shape detection roll, and detected values based on the displacement of the shape detection roll divided in the board width direction are compared for adjacent rolls. When a detected value is obtained, it is assumed that there has been an accumulation of deposits, and the brush roll is brought into contact with the shape detection roll to clean the surface of the shape detection roll, thereby maintaining the surface of the shape detection roll in a good condition. , can always detect the correct shape.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a side view showing the structure of an embodiment of the present invention. A spray nozzle 4 and a brush roll 5 are installed on the lower front and rear surfaces of a shape detection roll 3 installed between two deflector rolls 2, 2 on the exit side of a temper rolling mill, tension leveler, etc. in a continuous processing line for metal strips. The brush roll 5 can be brought into contact with and separated from the shape detection roll 3 by an air cylinder 6. Normally, the line is operated in a separated state.

In FIG. 1, water is always sprayed from a spray nozzle 4 toward the surface of the shape detection roll to clean the roll surface and prevent metal powder from adhering to it. However, since a position sensor is linked to the shape detection roll, the water should be low-pressure so as not to affect this. with this,
Most of the adhesion of dust, etc. can be prevented. FIG. 2 shows an example of the output of a shape detector using the shape detection roll 3 divided into ten parts in the width direction and an example of data processing. (a)
is a direct display value, and the part that changes continuously in the width direction is considered to represent the shape, but the fourth value from the left that is far away from the values on both sides is detected. As shown in (b), the sum of the differences between the displayed values with the adjacent sections is calculated, and if this is, for example, three times or more the set value D1 of the difference caused by normal shape defects determined experimentally, then the deposit is detected. It is determined that the value is an abnormal value.

[0012] When it is recognized that deposits have occurred,
The air cylinder 6 is operated to bring the brush roll 5 into contact with the shape detection roll to remove deposits. While the brush roll is in operation, there is a risk of detecting an abnormal value, so it is better not to perform shape detection.

[0013]

[Effects of the Invention] According to the present invention, there is no need to remove and clean the shape detector due to adhesion or accumulation of zinc, etc., and the line downtime due to brush roll operation is reduced to less than 0.02%, resulting in significant line operation. An improvement in the rate was observed.

[Brief explanation of drawings]

FIG. 1 is a side view showing the configuration of the present invention.

FIG. 2 is a graph showing the display and processing of the shape detector according to the present invention.

FIG. 3 is an overall layout diagram of a conventional device.

FIG. 4 is a configuration diagram of a device in the prior art.

FIG. 5 is a cross-sectional view of a shape detection roll in the prior art.

[Explanation of symbols]

1 Metal strip 3 Shape detection roll 4 Spray nozzle 5 Brush roll 6 Air cylinder

Claims (3)

[Claims] 1. A metal strip shape detection device comprising a shape detection roll divided in the width direction of the metal strip, comprising: a spray nozzle disposed near the shape detection roll for spraying cleaning water toward the surface of the shape detection roll; A shape detection device for a metal strip, comprising: a brush roll that comes into contact with and polishes the surface of the shape detection roll. 2. The metal strip shape detection device according to claim 1, wherein the brush roll is installed so as to be able to come into contact with and separate from the surface of the shape detection roll. 3. Comparing detection values based on displacement of shape detection rolls divided in the sheet width direction for adjacent rolls,
A metal strip shape detection device characterized in that when a detection value that is far different from that on both sides is obtained, it is assumed that deposits have been deposited, and a brush roll is brought into contact with a shape detection roll to clean the surface of the shape detection roll. how to use.