JP2971177B2 - Method of using metal strip shape detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to relates to the use of shape detection equipment in the continuous processing line for metal strips.

[0002]

2. Description of the Related Art Conventionally, as shown in, for example, Japanese Patent Publication No. 57-28890, Japanese Patent Application Laid-Open No. 62-207906, etc., a ring-shaped roll divided in a sheet width direction is used in a continuous processing line of a metal strip. 2. Description of the Related Art A shape of a metal strip is detected by contacting the metal strip and measuring a displacement of the metal strip.

[0003] Here, the shape of the metal strip refers to the state of length distribution measured by dividing the metal strip in the width direction and measuring each section. There is a one-sided expansion. FIG. 3 is an overall layout diagram of a shape measuring device disclosed in Japanese Patent Publication No. 57-28890, and FIG.
Is a configuration diagram of a shape measuring device, and FIG. 5 is a detection principle diagram of a shape detection roll. As shown in FIG. 3, the metal strip 1 is pushed up to a position slightly higher than the two transport rolls in the continuous processing line, in this figure, between the deflector roll 2 and the rolling roll 2 ′ and slightly higher than both rolls. A shape detection roll 3 for measuring the shape is provided.

In FIG. 4, a metal strip 1 having a shape distribution indicated by TD is pushed upward by a shape detecting roll 3, and a reaction force of the metal strip 1 caused by the pushing in a vertical downward direction due to an in-line tension of the metal strip 1 is divided by a split roll. The displacement of the metal strip 1 is detected by the sensor 9 for each divided section in the width direction, converted into a load by the calculator 11, and the eccentricity caused by the deflection of the shaft of the shape detection roll 3 is removed by the selector 13 and displayed. Displayed in total 14. FIG. 5 shows the principle of the detection portion. The displacement amount of the split roll differs due to the difference in the length of the metal strip 1 in the width direction, and this is detected as the distance h by the sensor below.

[0005] In a continuous processing line for metal strips, it is inevitable that metal powder generated in the line, dust entering from the surrounding environment, and the like adhere to the metal strip and rolls in the line. There is no particular problem as long as the dust is a kind of dust that comes off immediately after it adheres.For example, zinc powder in a galvanizing line has strong adhesion,
Since there is a tendency to grow by depositing one after another, and such deposition occurs on each ring of the shape detecting roll, an error occurs in the detection of displacement by the thickness thereof. Defects are displayed on the indicator, and by performing corrective operations that were originally unnecessary, the metal strip may meander or cause a shape defect.In extreme cases, the worst case is squeezing or strip breakage. The consequences of that are the consequences. In addition, the deposit itself generates a pressing flaw on the strip, which causes a defect.

For this reason, in an example of a continuous hot-dip galvanizing line for a cold-rolled steel strip, such a line stoppage due to the adhesion of zinc occurs once or twice a month, and the stoppage time due to maintenance of the shape detection roll is 5 to 7%. Had also reached. On the other hand, as a means for cleaning line rolls in a continuous processing line for metal strips, various types of roll wipers by fluid pressure or mechanical scraping are known. It was necessary to interrupt the shape measurement and operate intermittently, leading to a decrease in line efficiency. Also, if there was a margin on the safe side, it was likely that excessive cleaning would occur.

[0007]

[0008] The present invention is to solve this problem, the shape detection equipment to prevent accumulation of deposits in the shape detection roll under optimum conditions without compromising line efficiency
The purpose of this is to provide a method of using.

[0008]

[Means for Solving the Problems]

According to the present invention, the detection values based on the displacement of the shape detection rolls divided in the sheet width direction are compared for adjacent rolls. This is a method of using a metal strip shape detecting device, characterized in that a brush roll is brought into contact with a shape detecting roll to clean the surface of the shape detecting roll.

[0010]

According to the present invention, washing water is sprayed on the surface of the shape detection roll, and the detection values based on the displacement of the shape detection roll divided in the sheet width direction are compared for adjacent rolls, and are greatly separated from the adjacent rolls. When the detected value is obtained, it is considered that deposits have accumulated, and the brush roll is brought into contact with the shape detecting roll, and the surface of the shape detecting roll is maintained in a good condition by cleaning the surface of the shape detecting roll. , The correct shape can always be detected.

[0011]

FIG. 1 is a side view for explaining a method of using the present invention. A spray nozzle 4 and a brush roll 5 are provided on the front and rear lower surfaces of a shape detecting roll 3 installed between two deflector rolls 2 on the output side of a temper rolling mill, a tension leveler, etc. in a continuous processing line for metal strip. The brush roll 5 can be brought into contact with or separated from the shape detection roll 3 by an air cylinder 6. Usually, the line is operated in a state of being separated.

In FIG. 1, water is always sprayed from the spray nozzle 4 toward the surface of the shape detecting roll, and the roll surface is washed to prevent adhesion of metal powder and the like. However, since the position sensor is linked to the shape detecting roll 3, the water is low-pressure water so as not to affect the position sensor. Thus, adhesion of dust and the like can be almost prevented. FIG. 2 shows an example of an output of a shape detector using a 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 it is considered that a portion continuously changing in the width direction represents a shape.
Secondly, a value far from both neighbors is detected. This is calculated as shown in (b), and the sum of the difference between the display values of the two adjacent segments is calculated.
If this is experimentally-determined normal shape differences caused by bad setting value D ₁ of the example 3 times or more, to determine an abnormal value due to deposits.

If it is determined that deposits have been deposited,
The air cylinder 6 is actuated to bring the brush roll 5 into contact with the shape detection roll 3 to remove extraneous matter. During operation of the brush roll 5, there is a possibility that an abnormal value may be detected, so it is better not to perform shape detection.

[0014]

According to the present invention, there is no need to remove and clean the shape detecting roll due to adhesion and deposition of zinc and the like.
A remarkable improvement in the line operation rate was observed, such as the line stoppage time due to the operation of the brush roll was reduced to 0.02% or less.

[Brief description of the drawings]

FIG. 1 is a side view illustrating a method of using the present invention.

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

FIG. 3 is an overall layout view of an apparatus according to the related art.

FIG. 4 is a configuration diagram of an apparatus according to a conventional technique.

FIG. 5 is an explanatory diagram showing a principle of detection by a shape detection roll in a conventional technique.

[Explanation of symbols]

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

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G01B 21/00-21/32

Claims (1)

(57) [Claims] 1. A detection value based on the displacement of a shape detection roll divided in a sheet width direction is compared for adjacent rolls, and when a detection value that is far apart from both adjacent rolls is obtained, it is considered that deposits have accumulated. A method for using a metal strip shape detecting device, comprising: bringing a brush roll into contact with a shape detecting roll to clean the surface of the shape detecting roll.