JPH09257611A - Method for managing tension meter roll and level gage therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To highly accurately manage a winding angle by measuring differences in level between a sensing roll and front and rear line rolls with a level gage provided with a micrometer head respectively and managing the winding angle on the basis thereof. SOLUTION: A sensing roll 4 is provided between line rolls 2, 3 for carrying a steel strip 1 to measure tension thereof, and downward load received from the steel strip 1 of the roll 4 is detected with a load cell 6. A winding angle of the steel strip 1 for the roll 4 therefrom, a load cell-measured value of the load cell 6 and the tension of the steel strip 1 are calculated with an operation processing means. Here, difference in level between the roll 4 and the front and rear rolls 2, 3 are measured with a level gage 10 provided with a micrometer head 14 respectively, and the winding angle is managed on the basis of the measured difference in level. Thus, installation precision of the roll 4 can be measured in a micron unit, and accurate measurement is made possible at low cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control method for controlling a steel strip winding angle of a tension meter roll in a tension measuring device (tension meter) for a steel strip in a continuous process line, and a tension meter roll used in this method. It is about the level gauge.

[0002]

BACKGROUND OF THE INVENTION Problems to be Solved by the Invention
In continuous processes such as continuous annealing furnaces that process steel strips, it is necessary to measure and manage and control the tension of the strips.
This is the most important item for stabilizing the operation. As a tension meter (tension meter) used in such a continuous process line, for example, as shown in FIG.
In general, a load cell 6 is attached to the lower portion of the bearing 5 of the sensing roll 4 provided between the line rolls 2 and 3 that conveys the steel strip 1, and the downward force applied to the sensing roll 4 is detected by the load cell 6. is there.

FIG. 5 (b) shows the measuring principle of a load cell type tensiometer, in which the tension applied to the steel strip 1 is T ₁
If the vertical load component applied to the sensing roll 4 when it is (N) is T ₃ (N), the tension T _{1 of the} steel strip 1 is calculated from the vertical load component T ₃ detected by the load cell 6.
The equation for obtaining is geometrically determined as shown in the following equation (1).

T ₃ = T ₁ sin θ ₁ + T ₁ sin θ ₂ T ₁ = T ₃ / (sin θ ₁ + sin θ ₂ ) ... (1) θ ₁ , θ ₂ : Winding angles before and after the sensing roll T ₃ : Sensing Vertical load component applied to roll In this equation (1), θ (= θ ₁ + θ ₂ ) is the winding angle (rad) at which the steel strip 1 contacts the sensing roll 4, and as shown in FIG. The sensing roll 4 and the line rolls 2 and 3 before and after the sensing roll 4 are geometrically determined by the three roll installation positions and the respective roll diameters, as shown in the following formula (2).

[0005]

[Equation 1]

As can be seen from the equation (1), the wrapping angle θ must be accurate in order to detect the tension accurately. Further, as can be seen from the formula (2), the wrapping angle θ determines the wrapping angle accuracy, that is, the tension accuracy, depending on how much the installation accuracy H, L of each tension meter roll is as designed. .

Regarding this wrapping angle management method, three non-contact type distance meters are provided on a fixing member provided on the upper part of the sensing roll, and the wrapping angle θ ( A tension measuring device for determining θ ₁ + θ ₂ (Japanese Patent Laid-Open No. 4-262215) or a tension measuring device for changing the wrapping angle of the steel strip with respect to the sensing roll by moving up and down the line rolls before and after the sensing roll (actual) (Kaisho 60-1508) is proposed.

Although all of the above-mentioned conventional methods are excellent, the former method of providing the distance meter on the upper part of the sensing roll is because three distance meters are arranged on the fixing member installed on the upper part of the roll. However, it is practically difficult to use a normal continuous process line due to restrictions on equipment layout. Further, in the latter method of raising and lowering the line rolls before and after the sensing roll, the precision of the raising and lowering device and the position detector is inevitably caused, and the roll position precision becomes worse than the normal installation precision of the roll that does not move up and down.

The present invention has been made to solve the above-mentioned problems, and its purpose is to install a tension meter roll with a relatively simple structure without newly introducing equipment and sensors. An object of the present invention is to provide a tension meter roll control method and level gauge capable of measuring the precision in micron units and accurately controlling the wrapping angle of a steel strip with respect to a sensing roll.

[0010]

As shown in FIG. 1 (a), a tension meter roll management method according to the present invention is arranged between a plurality of line rolls for transporting a steel strip 1 so that the steel strip A sensing roll 4 for measuring tension, a load cell 6 for detecting a downward load T ₃ received from the steel strip of the sensing roll, a winding angle θ of the steel strip with respect to the sensing roll, and a load measurement value T ₃ from the load cell.
In the steel strip tension meter, which is composed of arithmetic processing means for calculating the tension T ₁ of the steel strip from the sensing roll 4 and the line rolls 2 before and after the sensing roll 4, as shown in FIG.
3 is measured by a level gauge 10 each equipped with a micrometer head 14, and the winding angle θ is managed based on the obtained height difference X.

As shown in FIG. 1 (b), the tension gauge roll level gauge according to the present invention is positioned at one roll position of the tension meter rolls 2 and 3, and the roll peripheral surface is in contact therewith. Base 13 having reference surface 11
And a detection unit 15 having a micrometer head 14 located at another roll position and capable of measuring the displacement in the direction orthogonal to the reference plane 11.

In the structure as described above, the level gauge 10 has a shape, for example, as shown in FIG.
The reference surface 11 of 3 may be in contact with the lower surface of the line roll 2, and the tip of the micrometer head 14 of the detection unit 15 may be in contact with the upper surface of the sensing roll 4. The level gauge 10 whose height-direction distance between the measurement surface of the micrometer head 14 and the measurement surface of the micrometer head 14 is adjusted to the reference roll height difference X ^* is set horizontally on the roll, and the actual displacement is calculated from the deviation amount ΔX of the micrometer head 14. A roll height difference X (= X ^* ± ΔX) is obtained. Thereby, the height difference X of the roll is accurately measured (in units of microns). From the height difference X, the variable H in the above equation (2) is obtained using the following equation (3).

[0013] _{H = D 1/2 + D} 2/2-X ......... (3) D 1: Line roll 2 with a diameter D _2: the diameter H of the sensing roll 4: the height difference between the center of each tension meter roll (2) To obtain θ ₁ and θ ₂ from H ₁ , H ₂ , L ₁ , L ₂ , D ₁ and D _{2 according} to the formula, and to obtain the tension T ₁ from θ ₁ , θ ₂ and T _{3 according} to formula (1). You can

As described above, since the height difference between the two tension meter rolls can be accurately measured in micron units, it becomes possible to control the installation precision in micron units when the tension meter rolls are replaced. Conventionally, when replacing the tension meter roll, the installation accuracy of each tension meter roll is checked by a general scale, and in this conventional method, the control is performed in mm units at the most, and as in the present invention, it is performed in micron units. It cannot be managed. For example, in the case of the roll arrangement as shown in FIG. 4, when the line roll 2 is displaced from the reference position by 1 mm, the following table 1 is obtained.

[0015]

[Table 1]

Each tension meter roll has a standard value of 10 m
Even if it is installed on m streets, there is nothing to confirm whether it really is so, so it is actually 9 mm or 11
Sometimes it is mm. At that time, an error of about 8% occurs in the actual tension. This error has a great adverse effect on the quality and stability of operation in the continuous process. In the present invention, such an error can be eliminated.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to an embodiment shown in the drawings. This is an example of a level gauge that accurately measures the height difference of two tension meter rolls of a three-roll tension meter roll in units of microns. The tension measurement state and the level difference measurement state with a level gauge are shown. FIG. 2 shows an embodiment of the level gauge according to the present invention. FIG. 3 shows the configuration of the micrometer head according to the present invention and its mounting portion.

In FIG. 1 and FIG. 2, this level gauge 1
0 is an example of measuring the height difference X between the lower surface of the line roll 2 or 3 and the upper surface of the sensing roll 4, and is mainly a plate-like base portion on which upper and lower reference surfaces 11 and 12 having good surface accuracy are formed. 13 and a plate-shaped detector 15 provided with a micrometer head 14, and a level 16 provided in the detector 15. The base 13 as a whole is positioned horizontally below the line rolls 2 or 3 for detection. The portion 15 is shaped so as to be positioned horizontally above the sensing roll 4. The level gauge 10 is not limited to this, and may be configured to measure the height difference X between the upper surface of the line roll 2 or 3 and the upper surface of the sensing roll 4.

The base 13 is a substantially U-shaped plate member having a plate thickness of about 12 mm integrally formed with a connecting piece 13a extending obliquely upward, and the detection unit 15 is a linear plate having a plate thickness of about 6 mm. The connecting piece 13a is attached to the end of the detection unit 15 and fixed to the rivet by spot welding. Further, the base 13 is provided with a rubber band hooking metal 13b to which a fixing rubber band is attached and a pin 13c.

The upper reference surface 11 is brought into contact with the lower surface of the line roll 2 or 3, and the micrometer head 14 is located above the sensing roll 4, so that different roll pitches P ₁ and P ₂ can be accommodated. The micrometer head 14 causes the detection unit 15 to have a predetermined distance P ₁ · P from the reference point O.
_Two are placed apart from each other. The level 16 is a special grade product, and is fixed to the upper surface of the detection unit 15 in the middle of the two micrometer heads 14.

As shown in FIGS. 2 and 3, the micrometer head 14 includes a spindle 14a, a thimble 14b with an indicator, and a friction (ratchet) stop 1.
4c and the like (movable range: 25 mm, minimum scale: 0.01 mm), and its lower portion is attached to the moving member 18 by the attaching member 17. The moving member 18 is the detection unit 15
A pair of left and right guides 19 fixed by spot welding to a fixing pin on the surface of the are engaged by knife edges and movably supported in a vertical direction orthogonal to the reference planes 11 and 12. Also,
The moving member 18 has a pair of vertically long bolt holes 20 formed on the left and right sides, and can be fixed at any vertical position by tightening a fixing bolt (screw) 21 inserted into the bolt hole 20. There is.

The level gauge 10 having the above structure is used as follows. Now, for example, line roll 2
The case where the height difference X between the sensing roll 4 and X = 14 mm is the reference value will be described.

(1) First, as shown in FIGS. 6A and 6B, a reference having a height Y corresponding to the sum Z of the height Z of the base portion 13 of the level gauge 10 and the reference roll height difference X ^*. Block 22
(The finishing accuracy of the surface is about ± 5 μm). For example, considering the case where the height Z of the base portion 13 is 25 mm, the reference block 22 has a height of 39 mm.

(2) As shown in FIG. 6C, the reference block 22 is placed on the pedestal 23 having a good flatness on the surface, and the reading of the micrometer head 14 is set to 2 mm. The micrometer head 14 is set on the pedestal 23, and the micrometer head 14 is set on the detection unit 15. Next, after confirming that the level 16 is horizontal, the micrometer head 14, that is, the moving member 18 is fixed to the bolt 2 for fixing.
It is fixed to the detection unit 15 by 1.

(3) Next, as shown in FIG. 6A, the level gauge 10 prepared as described above is applied to the actual line roll 2 and the sensing roll 4, and the base portion 13 is attached by the rubber band 24. Is fixed to the line roll 2.

(4) The spindle 14a, which is in contact with the upper surface of the sensing roll 4 of the micrometer head 14, is moved back and forth so that the level 16 becomes horizontal. The reading (± minute of 2 mm setting) of the micrometer head 14 when the level 16 becomes horizontal becomes the deviation amount ΔX from the reference value.

(5) If the deviation amount ΔX from the reference value is known,
Since the height difference X between the actual line roll 2 and the sensing roll 4 is 14 mm ± ΔX, the winding angle θ ₁ can be obtained using the equations (3) and (2). By performing the same measurement on the line roll 3, the winding angle θ ₂
Can be requested.

By using the level gauge 10, it is possible to accurately measure in a micron unit how much each tension meter roll is displaced from the reference position up and down, and from this, the wrapping angle is also actually measured. Therefore, the tension can be accurately detected. Table 2 shows the effect of the present invention in the roll arrangement example of FIG.

[0029]

[Table 2]

As described above, the micrometer, level, and
Judging from the accuracy of the reference block and the pedestal, the tension meter roll level gauge's detection accuracy is considered ± 100μ
Considering the case of m (± 0.1 mm), the accuracy of the present invention is 10 times higher than that of the conventional general scale method.

[0031]

According to the present invention, the level difference between the sensing roll and the line rolls before and after it is measured by a level gauge equipped with a micrometer head, and the winding angle is controlled based on the obtained level difference. As a result, the following effects are achieved.

(1) The installation accuracy of the tension meter roll can be measured in micron units with a relatively simple structure without newly installing equipment (distance meter, roll lifting equipment, etc.) as in the past. It enables low-cost and accurate measurement.

(2) It is possible to accurately measure how much each tension meter roll deviates vertically from the reference position in units of micron, and by considering the wrapping angle calculation formula, the deviation amount can be measured by using the steel strip. It is possible to accurately measure the tension of, and this can greatly contribute to the stabilization of product quality in a continuous process line.

[Brief description of drawings]

FIG. 1 is a tension meter according to the present invention,
(A) is a front view which shows the tension measurement state of a steel strip, (b) is a front view which shows the height difference measurement state by a level gauge.

FIG. 2 is an embodiment of a level gauge according to the present invention, (a) is a front view and (b) is a plan view.

FIG. 3 is a perspective view showing a micrometer head of a level gauge according to the present invention and a mounting portion thereof.

FIG. 4 is a schematic view showing an arrangement example of tension meter rolls.

5A is a front view showing an example of a tension meter of a continuous process line, FIG. 5B is an explanatory view of a measurement principle of a load cell type tension meter, and FIG. 5C is an explanatory view of a winding angle of a steel strip. .

FIG. 6A is a front view showing how the level gauge is attached to a roll, and FIG. 6B is a perspective view showing a reference block.
(C) is a front view showing a set state before measurement of the level gauge.

[Explanation of symbols]

 1 ... Steel band 2,3 ... Line roll 4 ... Sensing roll 5 ... Bearing 6 ... Load cell 10 ... Level gauge 11,12 ... Reference surface 13 ... Base 14 ... Micrometer head 15 ... Detector 16 ... Level 17 ... Mounting member 18 ... Moving member 19 ... Guide 20 ... Bolt hole 21 ... Fixing bolt 22 ... Reference block 23 ... Pedestal 24 ... Rubber band

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G01L 5/10 G01L 5/10 Z

Claims (2)

[Claims] 1. A sensing roll arranged between a plurality of line rolls for conveying a steel strip to measure the tension of the steel strip,
A load cell for detecting a downward load received from the steel strip of the sensing roll, a wrapping angle of the steel strip with respect to the sensing roll, and a steel strip made up of arithmetic processing means for computing the tension of the steel strip from the load measurement value from the load cell. In the tension meter, the height difference between the sensing roll and the line rolls before and after it is measured by a level gauge equipped with a micrometer head, and the wrapping angle is controlled based on the obtained height difference. Tension meter roll management method. 2. A base portion having a reference surface located at one roll position of the tension meter roll and contacting the roll peripheral surface, and a base portion located at another roll position in a direction orthogonal to the reference surface. A level gauge for a tension meter roll, comprising: a detector having a micrometer head capable of measuring displacement.