JPH0117768B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a rolled material suitable for use in setting the width or meandering of a rolled material in hot rolling, continuous casting equipment, etc., particularly a heated metal ingot. The present invention relates to a width direction position detection device.

[Conventional technology]

In rolling or continuous casting processing, precise sheet width control is desired in order to improve product yield. Particularly in the case of hot rolling, horizontal reduction is performed using rolling rolls, so that the width of the rolled material increases. If rolling is repeated while this condition is left as is, the width of the product sheet will become much larger than the set value, and the portion to be cut off during side trimming in subsequent processes will increase, resulting in a decrease in yield.

In addition, meandering is likely to occur in tension-free rolled materials such as the tip passage portion of reverse rolling with a single stand or rolling with a continuous stand. Therefore, a load meter is generally attached to the rolling device of the rolling mill, and the level of the rolling device is adjusted so that the difference in rolling load between the left and right sides becomes zero.

However, since meandering is detected based on the difference in rolling load, differences in rolling load that occur during rolling of two-sheet ends due to end bending of the rolled material or irregularly shaped parts at the leading and trailing ends are determined to be meandering phenomena. This may disturb the pressure level adjustment. Each time this occurs, the operator must intervene to stop the meandering control circuit and manually adjust the reduction level, which is cumbersome.

Recently, it has become desirable to control the plate width or meandering of heated metal ingots such as hot-rolled materials and continuously cast materials with high precision, and optical width direction positioning is used as a basis for detecting the plate width or meandering. A detection device has been developed.
This device was originally developed for measuring the width of cold-rolled materials, and is based on the measurement principle shown in FIG. That is, the elongated light projector 2 projects light onto the rolled material 1 from below the rolled material 1, and the amount of light in the portion not shielded by the rolled material 1 is measured by the receiver 3 provided above, that is, in the surface direction of the rolled material 1. Detect plate width. The light receiver 3 includes one using a photoelectric element (photodiode), one using a television camera type image pickup tube, and the like. Here, a method using a photoelectric element will be explained, but the principle remains the same even when a television camera type image pickup tube is used.
A plurality of photoelectric elements 5 are arranged in a straight line parallel to the elongated projector 2 (a "bit" is generally used as a unit of number), and emit an electric signal 7 proportional to the amount of light of an image focused through a lens 6. This amount of light is sliced at a constant level by a predetermined converter and converted into two types of synchronization signals 8: on and off. Since the detection distance per 1 bit is determined by the condensing angle 2α (or condensing range L) of the lens 6 and the distance H between the rolled material 1 to be measured and the lens 6, the total number of photoelectric elements is N.
N ₁ is the number of photoelectric elements that turned on upon receiving light,
If N is ₂ bits, the plate width B can be calculated using the following formula.

B=L×{N-(N ₁ +N ₂ )}/N = 2Htanα×{N-(N ₁ +N ₂ )}/N ……(1) Such sheet width detection means can be used to detect meandering of rolled material etc. It is also considered to be applied to That is, both ends of the elongated light projector 2 are used as fixed reference light sources, and the difference in the number of bits N ₁ and N ₂ of the left and right photoelectric elements 5 that receive light is compared. When the rolled material 1 meanderes, the distance between the widthwise end of the rolled material 1 and both ends of the reference light source, that is, the elongated light projector 2 changes between the left and right sides, and the number of photoelectric elements that receive light also differs between the left and right sides. The meandering amount is determined as the deviation amount of the center position of the rolled material 1 in the width direction based on this difference N ₁ −N ₂ .

[Problem to be solved by the invention]

In this meandering detection means, it is desired that the irradiation position from both ends of the elongated light projector 2 as a fixed reference light source is stable, and that the reference light position can be reliably detected at both ends of the photoelectric element 5 of the light receiver 3. However, in the conventional position, the long floodlight 2 was placed below the rolled material 1, so rolling dust, cooling water, etc. that fall on both sides of the rolled material 1 adhere to both ends of the long floodlight 2 and irradiate the material. If the patient's mouth was closed, the irradiation position would fluctuate, which could easily cause measurement errors. Furthermore, since the elongated light projector 2 is located below the rolled material 1, it is difficult to adjust its position and it is difficult to obtain a stable, stationary light source. In addition, as an example of this type of conventional device,
There is JP-A No. 55-35270, etc.

In addition, in hot rolling where the rolled material exhibits a high temperature of 900°C or more, the rolled material itself emits red-hot light, so the long light projector 2 of the plate width and meandering detection device for cold rolling described above is omitted. A method is known that utilizes the luminescence of the rolled material itself. FIG. 2 shows an example in which the red-hot light from the rolled material 1 is received by the light receiver 3 through the lens 6, and the number of bits of the photoelectric element 5 is
Assuming N ₀ , the plate width B is determined by the following formula based on the same principle as described above.

B=L×N ₀ /N = 2Htanα×N ₀ /N (1)A In addition, in this device, each distance B ₁ from the optical axis A of the lens 6 to the left and right ends of the rolled material 1 ,B ₂
It is also known that it is possible to determine the change in the amount of light received by the left and right photoelectric elements 5 of the light receiver 3, and to detect the meandering of the rolled material 1 based on this difference using the same principle as in the cold rolling described above.

However, in actual rolling equipment, vibrations during operation cause the light receiver 5 and lens 6 to tilt, causing errors due to angular shifts in the converging surface of the light receiver 5 and the optical axis of the lens 6, making it difficult to detect the amount of meandering. There is a problem that accuracy deteriorates.

An object of the present invention is to provide a widthwise position detection device for a heated metal lump that can reliably detect the width and meandering of a heated metal lump that emits red-hot light, such as a hot-rolled material, with a simple system configuration. It is.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention is provided in a conveying device that conveys a heated metal lump that emits red-hot light, and is fixedly arranged on both sides of the heated metal lump, and is irradiated with light directed in a direction perpendicular to the conveying surface of the transportation device. has a mouth;
A floodlight serving as a reference light source whose height of the irradiation port is approximately the same as the surface height of the heated metal lump, and a portion where the surface of the heated metal lump and the irradiation port of the projector are viewed from a direction perpendicular to the conveying surface of the transport device. installed, detects the reference light from the floodlight and the red-hot light from the heated metal mass,
The width of the heated metal lump is detected based on the distance between the reference light sources of each floodlight and the distance between the heated metal lump and each reference light source, and the width of the heated metal lump and the distance between the heated metal lump and each reference light source is detected.
The present invention proposes a width direction position detection device for a heated metal lump, which is equipped with a light receiver that detects the deviation amount of the center position of the heated metal lump based on the difference in the distance between the heated metal lumps.

The light receiver may include a plurality of light receivers arranged so that their detection ranges overlap in the width direction of the heated metal.

[Effect]

In the present invention, the projectors are fixedly arranged on both sides of the heated metal lump, and the irradiation port is not blocked by dust, etc., making it an immovable light source, so that the incandescent light emitted by the heated metal lump can be By comparatively detecting both of them with a light receiver, the width and center position deviation amount of the heated metal mass can be reliably detected with high precision regardless of vibrations of the light receiver.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 3 and 4.

In this embodiment, the device of the present invention is applied to a strip width and meandering control device for hot rolling equipment. first,
The basic configuration and operation of the detection device will be explained with reference to FIG.

10 is a conveyance roller provided at the outlet of the rolling mill;
11 is a heated metal lump, ie, a rolled material, which exhibits a high temperature of 900°C or more and emits red-hot light. At both sides of the rolled material 11, the respective irradiation ports 13 are directed upward, that is, toward the surface of the rolled material 11, and the height of the irradiation ports 13 is made substantially equal to the surface height of the rolled material 11, so as to serve as a reference light source. A pair of projectors 12 are fixedly arranged. Therefore, the reference light from the projector 12 and the red-hot light from the rolled material 11 are radiated upward.
At least a pair of light receivers 14 and 15 are disposed above the rolled material 11 in the surface direction so that their condensing ranges overlap in the width direction of the rolled material 11. These light receivers 14 and 15 are equipped with a photoelectric element, a converter, a setting device, etc., and sense the reference light from the projector 12 and the red-hot light from the rolled material 11, and detect both sides of the rolled material 11 and each of the projectors 12. The distance between them is calculated, and the width and center position deviation amount of the rolled material 11 are detected.

The plate width B ₁ of the rolled material 11 is the difference between the distance l ₁ between each reference light source and the distances C ₁ and D ₁ between the rolled material and the light source l ₁ -
(C ₁ + D ₁ ), this board width B ₁ is equal to the distance C ₁ ,
It can be detected based on the synchronization signals of the light receivers 14 and 15 corresponding to _D1 . In other words, each light receiver 14, 15
Since the signals S ₁ and S ₂ of the waveform shown in the lower part of FIG. 3 are obtained corresponding to the irradiation position, the number of bits N ₃ corresponding to the interval C ₁ and D ₁ of the signals S ₁ and S ₂ is Based on _N7 , the light emitting distance _H1 , and the light receiving range _L1 , the plate width _B1 can be determined by the following formula.

B=l ₁ −(N ₃ +N ₇ )×L ₁ /N (2) In Fig. 3, N is the total number of photoelectric elements in the receiver, and N ₁ and N ₅ are the number of outer frames of each emitter. The number of bits for the width, N ₂ and N ₆ are the number of bits for the width of the irradiation port of each emitter, and N ₄ and N ₈ are the number of bits for the width of each receiver.
This is the number of bits turned on by 11 glowing lights. Among these, N ₁ , N ₂ , N ₅ , and N ₆ can be known in advance, so
If N ₄ and N ₈ are known, N ₃ and N ₇ can be found.

In addition, if the rolled material 11 meandered, this rolled material 1
The deviation amount △B of the axial center position of 1 is calculated by the following formula based on the difference N ₃ - N ₇ between the number of bits of the signals S ₁ and S ₂ corresponding to the difference C ₁ - D ₁ between the left and right 〓 described above. It can be found by

△ _B = | _{N 3 − N 7 |} Vessel 15 side...(4).

In this embodiment, in which the plate width B ₁ and center position deviation amount of the rolled material 11 are determined, the floodlights 12 are fixedly arranged on both sides of the rolled material 11, so unlike conventional devices, the rolling dust of the rolled material 11 is There is no risk that the irradiation port 13 will be blocked by water, cooling water, etc., and detection accuracy can be maintained at a high level for a long period of time due to the immovable reference light source. Moreover, when the projector 12 is arranged in this manner, the position adjustment work becomes easier, unlike the conventional example in which the projector 12 is arranged below the rolled material.

Furthermore, floodlights 12 are provided on both sides of the rolled material 11.
is fixed, and using this as a reference light source, the position of the red-hot light on the rolled material 11 itself is detected to determine the strip width and center position deviation. Even if the light is tilted, by setting the light receiving range sufficiently outside the projector 12, there will be no errors like in the past, and the deviation amount of the board width and center position can be increased based on the fixed reference light source. Can be detected accurately. In particular, the accuracy of detecting the center position deviation amount, that is, the amount of meandering of the rolled material is significantly improved.

In addition, the light focusing range of the light receivers 14 and 15 is set to the rolled material 1.
1 in the width direction, even if the rolled material 11 having a plate width of 1/2 or less of the length of the conveying roller 10 is shifted to one side from the center position,
It becomes possible to detect the board width and meandering.

Next, a meandering control device for rolling equipment will be explained with reference to FIG. Note that the meandering detection section is given the same reference numeral as the corresponding part in FIG. 3, and the explanation thereof will be omitted. The arithmetic unit 16 is connected to the light receivers 14 and 15, and the calculations of the above-mentioned equations (3) and (4) are executed to obtain the axial center position deviation ΔB and the direction in which the deviation occurs. A hydraulic pressure reduction control device 17 is connected to the calculation device 16, and an adjustment valve 18 and a hydraulic jack 1 are connected to the control device 17.
9 are connected to form a servo circuit. In addition,
20 is a work roll, and 21 is a reinforcing roll. One side of the reinforcing roll 21 is supported by a hydraulic jack 19.

The hydraulic pressure reduction control device 17 sets the pressure reduction position of the hydraulic jack 19 based on the calculation results of the center position deviation amount ΔB and deviation direction obtained by the calculation device 16,
A pressure reduction level adjustment control signal for the hydraulic jack 19 is outputted via the adjustment valve 18. The reduction level adjustment operation is performed by supplying and draining oil to the hydraulic jack 19 in a direction that reduces the gap between the rolls on the side where the center position deviation has occurred and widens the gap on the opposite side. Ultimately, control is performed so that the center position deviation amount ΔB of the rolled material 11 becomes zero.

According to the device of this embodiment, it is possible to directly inform the operator of the meandering state of the rolled material 11 as seen from the top of the rolling mill stand. Therefore, unlike the conventional meandering control device that detects the rolling load, there is no malfunction, meandering can be reliably detected, and abnormal situations can be quickly dealt with. As a result, operations can be stabilized during sheet threading, which is a problem in continuous rolling mills and the like.

In the embodiment described above, a plurality of light receivers 1 are arranged so that the light collecting ranges overlap in the width direction of the rolled material 11.
4 and 15 are arranged, but this is suitable for use in a large rolling mill, and when applied to a small rolling mill, it is also possible to use a single light receiver.

Furthermore, although the embodiment described above is applied to a meandering control device for a rolling mill, the present invention can also be widely applied to a conveyance device for a continuous casting machine and other conveyance devices for heated metal ingots that emit red-hot light.

〔Effect of the invention〕

According to the present invention, it is possible to reliably detect the width and meandering of a heated metal lump that emits red-hot light, such as a hot rolled material or a continuous cast material, and to detect the width and meandering of a heated metal lump such as a continuous rolling mill or a continuous casting machine. and meandering control becomes accurate and easy.

[Brief explanation of drawings]

Fig. 1 is a principle diagram showing a conventional example of a widthwise position detecting device for cold-rolled materials, etc.; Fig. 2 is a principle diagram showing a conventional example of a widthwise position detecting device for a heated metal lump that emits red-hot light; FIG. 4 is a principle diagram showing an embodiment of the widthwise position detecting device according to the present invention, and FIG. 4 is a schematic diagram showing an example of application of the detecting device according to the present invention to a hot rolling mill. DESCRIPTION OF SYMBOLS 1... Rolled material, 2... Emitter, 3... Light receiver, 5... Photoelectric element, 6... Lens, 7... Electric signal, 8... Synchronization signal, 10... Conveyance roller, 11... Heated metal lump, 12
... Emitter, 13... Irradiation port, 14... Light receiver, 15...
Light receiver, 16... Arithmetic device, 17... Hydraulic pressure reduction control device, 18... Adjustment valve, 19... Hydraulic jack, 2
0...Work roll, 21...Reinforcement roll.

Claims (1)

[Scope of Claims] 1. A transport device that transports a heated metal lump that emits red-hot light has irradiation ports fixedly arranged on both sides of the heated metal lump and facing in a direction perpendicular to the transport surface of the transport device. a light source that serves as a reference light source and has an irradiation port whose height substantially matches the surface height of the heated metal lump; and irradiation of the heated metal lump surface and the floodlight from a direction perpendicular to the conveyance surface of the conveyance device. The distance between the reference light sources of each of the projectors and the distance between the heated metal lump and each reference light source is provided at a part where the mouth is viewed, and detects the reference light from the projector and the red-hot light from the heated metal lump. a light receiver that detects the width of the heated metal lump based on the distance, and detects the center position deviation amount of the heated metal lump based on the difference in the distance between the heated metal lump and each reference light source; A device for detecting a position in the width direction of a heated metal lump. 2. The width of the heated metal lump according to claim 1, wherein the light receiver is comprised of a plurality of light receivers arranged so that their detection ranges overlap in the width direction of the heated metal lump. Directional position detection device.