JPH07209108A - Method and device for measuring tension during strip rolling - Google Patents

Abstract

(57) [Summary] [Purpose] To measure the tension at any position in the width direction of the strip. [Structure] A nozzle 24 that directs the strip 12 is disposed on an upper horizontal piece 22a of a support member 22 that is disposed so as to sandwich the traveling path of the strip 12. The compressed air blown from the nozzle 24 displaces the strip 12 in the thickness direction. A displacement sensor 28 is arranged on the lower horizontal piece 22b of the support member 22 so as to face the nozzle 24 with the strip 12 in between. The calculation unit 30 calculates the tension based on the amount of displacement of the strip 12 detected by the sensor 28. The support member 22 is the strip 12
The slider 34 is arranged so as to be movable in the width direction. An endless belt 40 traveling in forward and reverse directions is fixed to the slider 34 by a positioning motor 42. That is, by driving the motor 42 forward and backward, the nozzle 24
And the displacement sensor 28 moves to an arbitrary position in the width direction of the strip 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for measuring tension during strip rolling, and more specifically, the width of a long strip having a thin plate-like cross section, such as a rolled metal strip. The present invention relates to a tension measuring method and device capable of measuring tension at an arbitrary position in a direction.

[0002]

2. Description of the Related Art In rolling a strip material represented by a metal strip steel, for example, in order to perform accurate rolling, it is desirable that the tension applied to the strip material at each position in the width direction during rolling be uniform. Therefore, the distribution of tension in the width direction of the rolled strip is measured, and the rolling mill is adjusted based on the data. As a device for measuring the tension of the strip, a tension detection roll in which a load cell is embedded in the width direction of the strip is contacted with the strip to obtain a tension, or an electromagnet is used to displace the strip to measure the tension. A means for obtaining the tension from the displacement amount is known.

When the above-mentioned tension detecting roll is used, the roll comes into contact with the strip material, which causes a problem that the surface of the strip material is damaged. Further, when an electromagnet is used, it cannot be used for measuring the tension of a non-magnetic material such as austenitic stainless steel, and it is pointed out that the material of the strip material is limited.

One proposal for addressing the above problems is
The applicant of the present application has filed an invention relating to Japanese Patent Application No. 4-191059 as "method of measuring tension distribution in the sheet width direction during rolling of a metal strip and apparatus used therefor". In the device according to the present invention, a plurality of fluid spraying means and displacement sensors, which are opposed to each other with the strip plate in between, are arranged at predetermined intervals in the width direction of the strip plate. That is, the fluid is sprayed onto the strip plate by each spraying means, the displacement of the strip plate at this time is detected by the corresponding displacement sensor, and the tension is measured based on the detected value.

[0005]

Since the tension measuring device described above can measure the tension of the strip in a non-contact manner, the strip is not damaged and the material of the strip is not limited. So it was something that could be evaluated.
However, since a plurality of spraying means and displacement sensors are provided, the manufacturing cost increases and the maintenance becomes complicated. Further, since the characteristics of each sensor vary, there is a problem in that the accuracy of the tension value at a plurality of positions in the width direction of the strip varies.

Further, since the spraying means and the displacement sensor are fixedly arranged at a required interval, the width of the strip is changed when the position for measuring the tension needs to be changed or the order is changed. In some cases, there are drawbacks that cannot be dealt with quickly. It is also pointed out that a dead zone cannot be detected between the displacement sensors.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks inherent in the conventional tension measuring method and apparatus, and was proposed in order to suitably solve the drawbacks. It is an object of the present invention to provide a novel tension measuring method and device capable of measuring the tension at an arbitrary position in the direction and capable of promptly responding to the change of the measuring position and the change of the width dimension of the strip.

[0008]

[Means for Solving the Problems] In order to solve the above-mentioned problems and preferably achieve an intended purpose, a tension measuring method at the time of strip rolling according to the present invention is carried out by rolling by a rolling mill. By moving the fluid spraying means for spraying a fluid from the thickness direction on the strip and the displacement detecting means for detecting the displacement of the strip caused by the spraying of the fluid in the width direction of the strip, It is characterized in that the tension at an arbitrary position in the width direction of the strip is measured based on the detection value of the displacement detection means.

Further, a tension measuring device at the time of rolling a strip according to another invention of the present application for achieving the above object is to apply a fluid from a thickness direction to a strip which is rolled by a rolling mill and is running. A fluid spraying means for spraying, a displacement detecting means for detecting a displacement of the strip caused by the spraying of the fluid, and a moving means for moving the fluid spraying means and the displacement detecting means in the width direction of the strip. A width of the strip by moving the fluid spraying means and the displacement detecting means in the width direction of the strip. It is characterized in that it is configured so that the tension at an arbitrary position in the direction can be calculated.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a method and apparatus for measuring tension during strip rolling according to the present invention will be described below with reference to the accompanying drawings, with reference to preferred embodiments. FIG. 1 is a schematic configuration diagram of a tension measuring device according to a preferred embodiment of the present invention, and the device 10 is arranged at a required position of a rolling device 14 for a metal strip 12. In the rolling device 14, the strip material 12 pulled out from the roll body 16 is subjected to required rolling by a rolling machine 18 having a plurality of roll groups arranged vertically with the traveling path of the strip material 12 interposed therebetween, The strip 12 is wound around the winding roll 20 on the downstream side.

The tension measuring device 10 is arranged between the rolling mill 18 and the winding roll 20. As shown in FIG. 1, the tension measuring device 10 is provided with a support member 22 having a U-shape arranged so as to sandwich the traveling path of the belt member 12, and extends in parallel with the belt member 12 of the support member 22. A nozzle 24 that directs the strip 12 is disposed on the existing upper horizontal piece 22a. Compressed air is supplied to the nozzle 24 from a supply source (not shown) through the tube 26. As shown in FIG. 2, the compressed air blown from the nozzle 24 at a required pressure causes the strip 12 to be removed. It is configured to be displaced in the thickness direction. The pressure of the compressed air blown out from the nozzle 24 is appropriately adjusted depending on the thickness dimension of the strip 12 and the material.

A displacement sensor 28 is disposed on the lower horizontal piece 22b of the support member 22 at a position facing the nozzle 24 with the strip 12 interposed therebetween, and the sensor 28 detects the displacement of the strip 12. Has become. Then, based on the value detected by the displacement sensor 28, the calculating means 30 described later is set to calculate the tension. As the displacement sensor 28, an eddy current displacement meter, an ultrasonic displacement meter, a laser distance meter, an optical sensor, an autofocus optical sensor, or the like can be preferably used.

As shown in FIG. 1, a pair of guide rails 32, 32, which are arranged in parallel at a predetermined interval in the running direction, are provided below the running path of the strip 12 in a direction intersecting the running direction ( It extends for a required length in the width direction of the strip 12.
The lower horizontal portion 22b of the support member 22 is disposed and fixed to a slider 34 slidably disposed on the guide rails 32,32. Further, the drive pulley 36 and the driven pulley 3 are separated by a predetermined distance in the extending direction of the guide rails 32, 32.
8 is rotatably arranged on a fixed portion (not shown), and the slider 34 is fixed to an appropriate portion of an endless belt 40 wound between both pulleys 36 and 38. A positioning motor 42, such as a servo motor or a stepping motor, is connected to the drive pulley 36, and the support member 22 causes the belt member to move along with the endless belt 40 that runs in the forward and reverse directions by driving the motor 42 in the forward and reverse directions. 12 in the width direction.
Thereby, the nozzle 24 and the displacement sensor 28 are
It can be moved to any position in the width direction of the strip 12. In order to accurately control the positions of the nozzle 24 and the displacement sensor 28, it is recommended that the pulleys 36, 38 and the belt 40 be toothed.

The displacement amount (detection value) of the strip material 12 detected by the displacement sensor 28 is input to the calculating means 30 shown in FIG. 1, and the calculating means 30 is set to calculate the tension. As the equation for calculating the tension, for example, the following equation is used. F = Kf / d F: Tension K: Constant f: Compressed air pressure d: Displacement In the vicinity of the widthwise edge of the strip 12, the amount of displacement changes depending on the distance from the edge. Therefore, an appropriate correction is made.

The tension data calculated by the calculation means 30 is input to the control means 44, which controls the rolling mill 18 according to the tension distribution in the width direction of the strip 12 (see FIG. 3). Is configured to be feedback controlled. The control means 44 uses the positioning motor 4
The drive control 2 is performed to move the nozzle 24 and the displacement sensor 28 to a preset tension measurement position. Further, the tension distribution data is displayed on a monitor (not shown) provided in the control means 44 so that the operator can confirm the data.

[0016]

Next, the actual measurement by the tension measuring device according to the embodiment will be described with reference to the flowchart of FIG. When the tension of the strip 12 being rolled is measured by the rolling device 14, the position to be measured according to the material and width of the strip 12 is input in advance to the control means 44. When the tension measuring device 10 is started, the positioning motor 4
2 is driven in the required direction, and the support member 22 is moved in the width direction of the strip 12 by the running of the endless belt 40. Then, when the nozzle 24 and the displacement sensor 28 arrive at the preset positions, the positioning motor 42 stops. Next, compressed air is supplied to the nozzle 24 through the tube 26, and this compressed air is blown onto the strip 12 from the thickness direction, and the corresponding portion of the strip 12 is displaced downward as shown in FIG. . In the displacement sensor 28, the strip 1
The displacement of 2 is detected, the detected value is input to the calculation means 30, and the tension is calculated by the above-described calculation formula. And
The obtained tension data is input to the control means 44.

By performing the above-mentioned tension measurement at a plurality of positions in the width direction of the strip 12, the tension distribution in the strip 12 in the width direction can be obtained as shown in the graph of FIG. 3, for example. In the graph of the embodiment, the tension varies in the width direction, and in this case, the rolling mill 10 is adjusted by the control means 44 so that the tension becomes uniform in the width direction. As the adjustment, the rolling amount in the rolling mill 18 is tilted in the width direction, the amount of reduction is adjusted by changing the deflection of the backup roll, and the amount of cooling oil supplied in the width direction of the strip 12 is adjusted. It can be mentioned. The measuring position and the number of tensions on the strip 12 can be easily changed by changing the input setting to the control means 44.

In this embodiment, the nozzle 24 and the displacement sensor 2 are
Since only one and 8 are used, the cost can be reduced and the maintenance can be simplified. Further, it is possible to promptly respond to a change in the tension measurement position on the strip 12 and a change in the width dimension of the strip 12. In addition, it is possible to measure the tension at all positions in the width direction of the strip 12 and there is an advantage that a dead zone does not occur. In addition, based on the data obtained by the tension measurement by the tension measuring device 10,
The rolling mill 18 can be adjusted automatically.

The measuring method shown in the flow chart of FIG. 4 measures the tension distribution at a plurality of measuring positions in the width direction of the strip material 12.
It is also possible to measure a continuous tension distribution in the width direction of the strip 12 as shown in the flowchart of FIG. That is, the nozzle 24 and the displacement sensor 28 are attached to the strip 12
To one end in the width direction. The nozzle 24 and the displacement sensor 28 are continuously moved in the width direction of the strip 12 while blowing the compressed air from the nozzle 24 in the thickness direction of the strip 12, so that the strip sensor 12 is moved by the displacement sensor 28.
The displacement of is continuously detected. By inputting the value detected by the displacement sensor 28 to the calculation means 30, the continuous tension in the width direction of the strip 12 is calculated based on the above-described calculation formula. Further, the tension data is input to the control means 44, and the continuous tension distribution is displayed on the monitor.
Thus, when measuring the continuous tension distribution in the width direction of the strip 12, the nozzle 24 and the displacement sensor 28 are used.
Since it is not necessary to stop at the required position, the measurement time can be shortened.

[0020]

[Another embodiment] FIG. 6 shows another embodiment of the tension measuring device 10, which is a nozzle 2 for blowing out compressed air.
4 and the displacement sensor 26 are arranged in parallel on one side of the strip 12 in the thickness direction. That is, a rectangular support base 46 is disposed on the slider 34 slidably disposed below the traveling path of the belt material 12, and the nozzle 24 is disposed on the support base 46 in an upward direction. It is set up. Further, a holding piece 48 is provided so as to project from the support base 46, and the displacement sensor 26 is arranged on the holding piece 48 in parallel with the nozzle 24. Therefore, in this alternative embodiment, the nozzle 2
The band material 12 is displaced upward by the compressed air blown from the nozzle 4, and the displacement at this time is detected by the displacement sensor 26 located below.

As in another embodiment shown in FIG. 6, the measuring device 10 can be made compact in a configuration in which the nozzle 24 and the displacement sensor 28 are arranged below the traveling path of the strip 12. In addition, the support base 46 can be moved stably.

FIGS. 7 and 8 show still another embodiment of the tension measuring device 10, in which an eddy current displacement meter is adopted as the displacement sensor 28, and the nozzle 24 and the displacement sensor 26 are shown in FIG. As in the embodiment, the strip 12 is coaxially arranged on one side in the thickness direction. That is, the displacement sensor 28, which is an eddy current displacement meter disposed on the support base 46, has a coaxial hollow portion 50 as shown in FIG. 8, and the nozzle 24 is integrally incorporated into this hollow portion 50. There is. With the configuration of this alternative embodiment, the device 10 can be made more compact than that of the embodiment shown in FIG.

[0023]

[Modification] In the embodiments, the combination of the pulley and the endless belt has been described as an example of the moving means of the nozzle and the displacement sensor. However, the present invention is not limited to this, and the combination of the sprocket and the chain. It may be a combination. Further, it may be configured such that a pinion that is normally and reversely rotated by a positioning motor is meshed with a rack provided on a support member or a support base. Further, it is also possible to adopt a configuration in which a ball screw which is normally and reversely rotated by a positioning motor is screwed into a nut arranged on the support member or the support base. Furthermore, the nozzle and the displacement sensor may be moved by independent moving means.

Further, in the embodiment apparatus shown in FIG. 1, the displacement sensor is arranged above and the nozzle is arranged below the strip material, and in the embodiment apparatus shown in FIG. 6 and FIG. It is possible to adopt a configuration in which the nozzle and the displacement sensor are arranged above the material. Furthermore, the tension measuring device of the embodiment can be used for measuring the tension of not only metal but also thin plates and films made of synthetic resin. The fluid blown out from the nozzle is not limited to gas, and liquids such as water and oil can be used.

[0025]

As described above, according to the tension measuring method and apparatus for rolling a strip according to the present invention, the fluid spraying means and the displacement detecting means are moved in the width direction of the strip,
The tension at any position in the width direction of the strip can be measured. That is, it is possible to easily change the tension measurement position and the number of measurements, and it is possible to quickly respond to the change of the width dimension of the strip material due to the order change.

Further, since the displacement of the strip is detected by a single displacement detecting means, there is no variation in accuracy among a plurality of detected values, performance management becomes easy, and maintenance can be simplified. . Further, since the obtained tension data can be fed back to the rolling mill, rolling can always be performed with high accuracy.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a tension measuring device according to a preferred embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a state in which a displacement of a strip is detected.

FIG. 3 is a graph showing the results of measuring the tension at a plurality of positions in the width direction of the strip.

FIG. 4 is a flow chart when tension is measured by the tension measuring device according to the embodiment.

FIG. 5 is a flowchart diagram when tension is measured by another method by the tension measuring device according to the embodiment.

FIG. 6 is an explanatory diagram showing a main part of a tension measuring device according to another preferred embodiment of the present invention.

FIG. 7 is an explanatory diagram showing a main part of a tension measuring device according to still another preferred embodiment of the present invention.

8 is a schematic cross-sectional view of a nozzle and a displacement sensor of the tension measuring device shown in FIG.

[Explanation of symbols]

 12 band material 18 rolling mill 24 nozzle 28 displacement sensor 30 calculation means 34 slider 36 drive pulley 38 driven pulley 40 endless belt 42 positioning motor 44 control means

Claims (6)

[Claims] 1. A fluid spraying means (24) for spraying a fluid from a thickness direction onto a running strip (12) rolled by a rolling mill (18), and a strip produced by spraying the fluid ( Displacement detection means (28) for detecting the displacement of 12), by moving in the width direction of the strip (12), based on the detection value of the displacement detection means (28) of the strip (12) A tension measuring method at the time of strip rolling, wherein the tension at any position in the width direction is measured. 2. A fluid spraying means (24) for spraying a fluid from the thickness direction onto a running strip (12) which is rolled by a rolling mill (18), and is produced by spraying the fluid. Displacement detecting means (28) for detecting the displacement of the strip (12), and moving means for moving the fluid spraying means (24) and the displacement detecting means (28) in the width direction of the strip (12) ( 34,36,38,4
0, 42) and a calculating means (30) for calculating the tension of the strip (12) based on the detection value of the displacement detecting means (28), the fluid spraying means (24) and the displacement detecting means. (28) with strip
A tension measuring device at the time of rolling a strip, which is configured to be able to calculate the tension at an arbitrary position in the width direction of the strip (12) by moving in the width direction of the strip (12). 3. The fluid spraying means (24) and displacement detecting means
The tension measuring device at the time of rolling the strip material according to claim 2, wherein the (28) and the strip material (12) are arranged to face each other in the thickness direction. 4. The fluid spraying means (24) and displacement detecting means
The tension measuring device at the time of rolling the strip material according to claim 2, wherein the (28) and the strip material (12) are arranged in parallel on one side in the thickness direction of the strip material (12). 5. The fluid spraying means (24) and displacement detecting means
The tension measuring device during rolling of a strip material according to claim 2, wherein the (28) is coaxially arranged on one side in the thickness direction of the strip material (12). 6. The strip material calculated by the calculating means (30)
The tension measuring device during strip rolling according to claim 2, further comprising control means (44) for performing feedback control of the rolling mill (18) based on the tension of the (12).