KR810001579B1 - Shape detection device for detecting flatness of strips - Google Patents

Abstract

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Description

Shape detection device for detecting the flatness of the script

1 is a side view of a rolling apparatus using the shape detector of the present invention.

2 is a front view of the shape detector of the first embodiment of the present invention.

3 is a cross-sectional view taken along line III-III of FIG.

4 and 5 are signal diagrams of the shape detector of the present invention.

FIG. 6 is an enlarged view of the portion “A” of FIG. 3.

7 is a cross-sectional view taken along line 6 of FIG.

8 is an enlarged view of the portion 'A' of FIG. 3 as a second embodiment of the present invention.

9 is a cross-sectional view taken along line X-ray of FIG.

10 is an enlarged view of the portion 'A' of FIG. 3 as a third embodiment of the present invention.

11 is an enlarged view of the portion 'A' of FIG. 3 as a fourth embodiment of the present invention.

12 is an enlarged view of the portion “A” of FIG. 3 as a fifth embodiment of the present invention.

13 is a front view of a shape detector as a sixth embodiment of the present invention.

14 is a sectional view taken along line XIV-XIV of FIG.

15 is a front view of a shape detector as a seventh embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting the shape of a strip during rolling. The present invention relates to a method of detecting flatness in a strip width by pressing a plurality of rings divided in the width direction of a strip against a strip. Relates to a device.

In cold rolling the flatness of the strip is of great concern. That is, the thinner the thickness of the final product of the rolled strip, the more serious the control of the flatness of the strip, ie the control of the shape, is to be solved.

If there are irregularities in the rolled strip, the unevenness of the strip can be easily found visually without tension being applied to the strip. However, when the strip is tensioned during rolling, the unevenness of the strip increases and cannot be detected visually. Therefore, various shape detectors have been developed to detect the shape of the strip continuously while the strip is in tension and while the strip is running.

For example, by pressing a plurality of rings divided in the width direction of the strip to the strip by measuring the component of the tension of the strip applied to each ring to detect the shape of the strip from the distribution of the tension in the width direction of the strip There is a shape detector.

This shape detector is based on the principle that in the state where tension is applied, the shape of the strip, that is, the irregularities appear as a change in the width direction of the strip and the distribution of the tension, and the shape is detected by measuring the distribution of the tension.

As a representative example of such a split ring type shape detector, a roller bearing is inserted into an axis traversing a strip, and a plurality of rings are rotatably inserted so that the distribution of the tension of the strip applied to each ring is installed between the roller bearing and the shaft. detection with a load cell-weight detector). (See, for example, US Patent No. 3,902,363.) However, such shape detectors require roller bearings on the inner circumference of each ring to ensure smooth rotation between the ring and the shaft. Generally, roller bearings, no matter how precisely manufactured, have looseness of tens to hundreds of microns (μ), while the shape of the plate requires flatness of several tens of microns. Therefore, even if the tension component is measured using a high precision load cell, it is difficult to detect the shape of the plate due to the looseness of the roller bearing.

In addition, the surface of the ring which is in constant contact with the strip may be abraded by friction with the strip, or the flaw of the surface of the strip and the flaw due to minute irregularities need to be frequently polished. However, since the roller bearing is built in the inner circumference of the ring as described above, there is a problem that the ring surface is eccentrically polished due to the looseness of the roller bearing even when the roller bearing is rotated and polished while the ring is inserted on the side.

In addition, a plurality of load cells are built into each ring inside the ring. Since this load cell requires a high load detection capability, a good measuring atmosphere is required, it is very expensive, and there is a weak problem in impact load.

Therefore, despite the need for regular inspection, since the load cell is embedded in the ring, it is difficult to disassemble.

On the other hand, a high pressure fluid flows between the shaft and the bearing without using a load cell and roller bearing to form smooth weaving between the ring and the shaft, and the fluid pressure between the ring and the shaft is applied to the tension component. There is a shape detector which detects the fluid pressure from proportional to the formation detection (US Pat. No. 3,499,306). However, also in this detector it is necessary to incorporate a device for detecting the fluid pressure in the shaft, a thin nozzle installed on the shaft Since the fluid is ejected from the nozzle toward the ring, it is necessary to manage such as removing dust from the fluid.

As the most desirable shape detector, it is necessary to say that the detection capability is always high, but it is easy to disassemble and repair without using a load cell that requires little repair and no expensive load cells in the rotating part, and a built-in load cell that requires repair. It is a shape detector.

SUMMARY OF THE INVENTION An object of the present invention is to provide a shape detector capable of shape detection with high accuracy, a simple structure and a low cost.

The present invention is characterized in that both ends are rotatably fitted with an elastic body and a plurality of rings are inserted outside of the shaft to prevent the eccentricity of the ring caused by the bending of the elastic body. ), And the shape of the strip is detected by detecting the amount of eccentricity with a gap detecting device arranged on the outer circumference of the ring.

The present invention will be described in detail by way of examples.

1 shows an example in which the shape detector 1 of the present invention is disposed between the rolling mill 2 and the winding machine 3. The strip 6 rolled between the rolls 4 of the rolling mill 2 is wound on the winder 3 with tension. The shape detector 1 detects the distribution state of the component of tension in the direction perpendicular to the movement of the strip 6 while being pressed against the strip 6. The detection signal is converted into a shape signal by the calculator 5 and used for shape control of the strip as an input of rolling-reduction control and bending force control.

Hereinafter, the first embodiment of the shape detector of the present invention will be described in detail with reference to FIGS. 2 and 3. As shown in FIG. 2, the shape detector 1 is fixed between the guide frames 10 and on the lifting frame 9 which can be lifted and lowered by the hydraulic cylinder 12. Both ends of the shaft 8 are rotatably supported by roller bearings 14 fixed to the elevating frame 9, and the support of the shaft 8 is integrally rotatable with the shaft 8 and has a constant distance from each other. Many rings 11 are fitted. The strip 6 while traveling is wound while rotating the ring 11 and the shaft 8 in contact with the outer circumference of the ear ring 11. On the other hand, on the side not in contact with the strip 6 of the ring 11, i.e., below the ring 11 in FIG. 2, an interval detector 7 equal to the number of the rings 11 is fixed on the elevating frame 9 It is.

Next, FIG. 3 is explained. The gap detector 7 has a gap G that does not come into contact with the ring 11 and is inserted into a holder 15 below the ring 11. The top of the holder 15 is covered with a lid 16 to prevent fouling of the gap detector 7 and filled with cooling water for cooling the gap detector 7. Under the holder 15 a signal line 17 of the gap detector 7 is drawn out and the signal lines of each gap detector are collected and guided out through a duct 18. Both sides of the holder 15 are provided with nozzles 19 opened in the circumferential tangential direction of the ring 11 to blow a scale or the like attached to the outer circumferential surface of the ring 11.

On the other hand, between the ring 11 and the shaft 8, many cylindrical springs 20 made of cylindrical pipes are sandwiched in a direction parallel to the axis center of the shaft 8. The cylindrical spring 20 is bent in an elliptical cross-sectional shape in the direction perpendicular to the axis by the force of the tension of the strip applied to the ring 11. Since the amount of bending is linearly proportional to the component of tension, when the amount of bending, i.e., the distance between the gap detector 7 and the ring 11, is detected by the gap detector 7, The strip width direction distribution state is detected.

As a result, the principle of the shape detector of the present invention converts the difference in tension due to the unevenness of the strip into the amount of bending of the elastic body inserted between the ring 11 and the axis 8, as shown in FIG. The amount of eccentricity from the shaft center of the shaft 8 of 11) is taken as the amount of change in the distance between the distance detector 7 and the outer peripheral surface of the ring 11. The signal of each gap detector 7 thus detected is transmitted to the rolling control device 52 as a shape signal integrated in the calculator 51.

As described above, the shape detector of the present invention has high accuracy without causing looseness such as roller bearing and film bearing between the ring 11 in contact with the strip and the shaft 8 supporting the ring 11. ), It is possible to detect the shape, and since the load cell is not embedded in the ring requiring maintenance, it has the advantage of simple structure and easy disassembly.

Shown in FIG. 5 is an embodiment of the present invention having a device for correcting errors due to the amount of deflection and eccentricity of the shaft. It is preferable that the shaft 8 penetrating the ring 11 has a thickness such that the shaft 8 does not bend even under tension of the strip. However, there is a limit to increasing the outer diameter of the ring 11 in view of the accuracy of shape detection. Therefore, inevitably, an upper limit occurs even in the thickness of the shaft 8, and it is inevitable that the shaft is bent as shown by the dotted line 81 in FIG. Moreover, the roller bearing 14 which supports the both ends of the shaft 8 rotatably also causes some looseness, and causes an eccentric movement of the shaft. Therefore, in the present embodiment, a pair of gap detectors 71 are provided inside the roller bearings 14 at both ends of the shaft to detect the amount of eccentricity and the amount of bending of the shaft 8. That is, the amount of bending in the strip width direction of the axis 8 is calculated mechanically from the eccentricity and the amount of bending of the axis detected by the distance detector 71 by the calculator 53, and from the signal at each interval detector 7, Subtraction in 51) can detect the unevenness of the removed pure strip of eccentricity and curvature of the shaft 8 from the signal at the gap detector 7.

6 and 7 illustrate the first embodiment of the elastic body 20 in detail. In this embodiment, the elastic body is composed of a metallic cylindrical spring 201 having the same straightness and thickness. The cylindrical string 201 is accommodated in the groove 81 in the axial direction of the main surface of the shaft 8. The groove 81 is of a depth sufficiently shallower than the diameter of the cylindrical spring 201. The cylindrical spring 201 is in contact with the inner circumferential surface of the ring 11 at the same time. Each cylindrical spring 201 is provided with a number corresponding to the number of rings 11 and a spacer ring 21 so as not to contact them between the ring 11 and the corresponding cylindrical spring 201. Is installed. The spacer ring 21 is arranged to surround the shaft 8 and has a protrusion 22, 23 on a part thereof. The protrusions 22 and 23 are provided to support the spacer ring 21 so as not to rotate about the ring 11 and the shaft 8, and the grooves 111 and the shaft 8 of the ring 11, respectively. It is inserted in the groove 81. Another spacing ring 24 is inserted between the rings 11.

As the elastic body, various kinds can be applied. 8 and 9 show a second embodiment of the present invention using a solid shaft with a staircase as an elastic body. The outer periphery of the shaft 8 is provided with the projection 82 in the position which opposes the ring 11, The U-shaped groove 83 is opened in this projection 82. As shown in FIG. The solid shaft 202, which has a staircase, has a large diameter head (h), a small diameter central portion (b), and a neck portion located between the head (h) and the central portion (b) ( n). The central portion b of the solid shaft is accommodated in the groove 83 and supported by the bottom of the groove 83. The head h is in contact with the ring 11. Here, when the tension component of the strip is applied to the ring 11, the hollow shaft 202 is bent and the ring 11 is eccentric with respect to the shaft center of the shaft 8.

10 shows a third embodiment of an elastic body. On the outer circumference of the shaft 80, a plurality of projections 84 extending in the axial direction are provided, and a ring 28 is fitted so as to contact the projections 84. At the outer circumference of the ring 28, a cylindrical shaft 29 is disposed at a position away from the projection 84. When a tension component of the tension of the strip is applied to the ring 11, the ring 28 is deformed through the axis 29 abutting the ring 11 so that the ring 11 corresponds to the component force of the tension 8 at the center of the shaft 8. Eccentric about

Like the embodiment of FIG. 6 of the shaft 29, it is fixed by the spacing ring 21. As shown in FIG.

11 shows a fourth embodiment of an elastic body. Like the embodiment of FIG. 10, the shaft 8 is provided with the projection 84, and the outer periphery of the projection 84 is fitted with a ring 28 having a projection 29 projecting from a position away from the projection 84. have. The projection 29 of the ring 28 is in contact with the inner circumference of the ring 11. Therefore, when a strong component of the strip is applied to the ring 11, the ring 28 is deformed so that the ring 11 is eccentric with respect to the axis of the shaft 8 corresponding to the component of tension. The ring 28 is fixed with a suitable device so that the relative positional relationship with the shaft 8 and the ring 11 does not change like the embodiment of FIG.

FIG. 12 shows the fifth embodiment of the elastic body, in which the shaft 8 is provided with a plurality of projections 84 in the axial direction as in the embodiments of FIGS. 10 and 11. An elastic plate 30 is sandwiched between the protrusions 84. Moreover, the protrusion 112 of the ring 11 is provided in the position which opposes the outer peripheral surface of each board. Therefore, when the component of tension of the strip is applied to the outer circumference of the ring 11, a load is applied to the plate 30 through the protrusion 112 and the plate is bent. By bending of the plate, the ring 11 is eccentric with respect to the shaft center of the shaft 8 corresponding to the component of tension.

As described above, various kinds of elastic bodies can be considered. In other words, any one may be used as long as a predetermined amount of eccentricity is applied to the ring 11 in response to the load applied to the ring by being interposed between the ring 11 and the shaft 8.

In the embodiment shown in FIGS. 13 and 14, in order to correct the detection error due to the bending of the shaft 8, the shaft 8 is vacant in the center, and both ends of the support plate 41 are disposed in the hollow portion of the shaft 8. The shaft 42 fixed to the shaft is incorporated to detect the curvature of the shaft 8 inside the shaft 8.

As shown in detail in FIG. 14, one or more gap detectors 72 are fixed to the shaft 42 so as to face at predetermined intervals in the inner circumference of the hole of the shaft 8. Here, if the shaft 8 is shaken by the tension of the strip or eccentricity by the looseness of the roller bearing 14, the distance between the hole inner circumference of the shaft 8 and the distance detector 72 changes, causing the bending of the shaft 8 and Eccentricity can be detected. This detected value is processed by the calculator 53 similarly to the detected value obtained by the interval detector 71 of FIG. 5, and may be applied to the calculator 51 as a shape correction signal.

Therefore, the present embodiment can detect the net bending amount of the elastic body by the component of tension of the strip by subtracting the bending portion of the shaft 8 from the bending amount of the elastic body 20 including the bending of the shaft 8 and having a shape detecting ability. This is improved.

In the above description, the embodiment of detecting the component of tension in pressing the ring 11 against the surface of the strip has been described. It goes without saying, however, that the same effect can be obtained by pressing the ring 11 against the surface of the strip as shown in FIG. In addition, although the gap detector 7 described the embodiment arrange | positioned at the side which is not in contact with the strip of the ring 11, it is not necessarily limited to this, For example, the gap detector 7 and the ring 11 like FIG. 15 are shown. The strip may be interposed between the strips. In this case, the strip may contact the gap detector, and the gap detector may be embedded in the plate 91.

As described above, according to the present invention, there is no roller bearing and film bearing which cause looseness between the ring contacting the strip and the axis penetrating the ring, so that the detection error can be made extremely small. In addition, although the roller bearing 14 is provided at both ends of the shaft 8, the eccentricity of the shaft caused by the looseness of the roller bearing and the bending of the shaft may be easily removed from the eccentricity of the ring due to the component of tension of the strip.檢出 精度 is very high. In addition, compared with the shape detector in which a detector such as a load cell is incorporated in the ring, the detector is located outside of the ring, so that the maintenance and inspection can be easily performed.

In addition, since the tension component of the strip is once converted to the amount of bending of the elastic body, the amount of bending is detected by the gap detector, which does not require an expensive load cell.

Claims (1)

A plurality of rings arranged in the strip width direction while traveling, the outer circumference of which is in contact with the strip surface, a shaft 8 rotatably supported at both ends through the ring, and interposed between the ring 11 and the shaft 8 An elastic body 20 which supports the ring 11 to rotate integrally with the shaft 8, while the center of the ring 11 is eccentrically supported with respect to the shaft center of the shaft 8, the respective rings As the distance detector 7 which is disposed at a position opposite to the outer circumference of the 11 and detects the amount of eccentricity of the ring 11 due to the load that the ring 11 receives from the strip as a distance from the outer circumference of the ring 11. Shape detection device for detecting the flatness of the strip, characterized in that configured.

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