JPH0263657A - Torch droop sticking detector for continuously cast slab - Google Patents

Abstract

PURPOSE:To allow the decision of whether discrete droop sticking exists or not with each of detecting rods and to surely detect partial torch droop sticking by deciding the presence or absence of the torch droop from a change in the angles of inclination of the detecting rods as an ingot is transported. CONSTITUTION:Plural pieces of the detecting rods 4 mounted with revolving shafts 5 are provided in the transverse direction of a slab to the lower side of the pass line between transporting table rollers 3. Each of the rods 4 is projected upward from the pass line of the rollers 3 by a weight 7 mounted to one end thereof so that the rod comes into contact with the rear surface of the slab even if the slab 1 has an inferior condition such as warpage. Plural pieces of the rods 4 are respectively mounted with inclination angle detectors 6 so that the discrete decision of the presence or absence of the droop sticking with each of the rods 4 can be executed by feeding the change in the angles of inclination of each of the respective rods 4 into a decision device 9. The detection of the partial torch droop sticking is possible as well.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is applicable to continuous casting equipment (torch cuff) for casting slabs.
This invention relates to a device that detects the presence or absence of torch sag on both ends of a slab in the longitudinal direction, which sometimes occurs.

<Prior art> Torch sag 2, 2', which is not shown in Fig. 6, which adheres to the lower edges of both longitudinal ends of the continuously cast slab 1 when cutting it with a torch, is removed by the torch to prevent the occurrence of defects in hot rolled products. Although sag is removed by a torch sag removal device installed after the center, sometimes the sagging is not completely removed and slabs with torch sag still attached are produced.

As a method for detecting adhesion blur at this time, Japanese Patent Application Laid-Open No. 58903
As shown in Publication No. 61, there is a technique for determining the presence or absence of sag by attaching a vibration detector to the conveyance roller support member and comparing the amount of vibration detected with a set standard value. The amount of vibration detected varies greatly depending on the shape of the warp, etc., making it difficult to reliably detect the presence or absence of torch sag. Therefore, at present, there is no torch sag detection device that can reliably detect torch sag, and the operator is forced to perform a visual check, which increases labor costs and other costs.

<Problems to be Solved by the Invention> The conventional discrimination technology based on the amount of vibration has problems such as the occurrence of erroneous judgments due to the shape of the slab such as upward warping and downward warping, and the difference in weight of the slab, as well as the problem shown in Fig. 6 (b). Since there has been a problem in that a visual check is required because partial sag cannot be detected, the present invention solves this problem and provides a detection device that can reliably detect whether or not sag is attached to a continuously cast slab. It was made for the purpose of

Means for Solving the Problem> The present invention is a device for detecting torch sag attached to the lower part of the end of a continuously cast slab on a general conveyance table, which includes: A plurality of detection rods that are attached to a shaft and are pushed upward so that one end is pressed against the lower surface of the slab, a device that detects changes in the inclination angle of the detection rods as the slab is conveyed, and the inclination This is a torch sag adhesion detection device for continuously cast slabs, characterized in that it is provided with a determining device for determining the presence or absence of sag based on a change in angle.

<Operation> When the slab is conveyed in the direction of the arrow in Fig. 1, its tip comes into contact with the tips of the plurality of detection rods 4, and the tips are pushed down, so that the slab is detected as shown in Fig. 2. The plate inclination angle is calculated from angle α to time t, and thereafter from the broken line 20. As shown by the solid line 21, it decreases to β. At this time, if 1--Chida μ is not attached to the lower edge of the tip of the slab, the tip of the detection rod remains in contact with the lower surface of the slab and the slab is moved at the time t.
2 to time t5, and the inclination angle is maintained at β between t2 and t5.

However, if the slab is warped downward or upward, the inclination angle becomes somewhat larger (β') or smaller (β'') between times t2 and t5, as shown by the dashed-dot line 22 and the dashed-double line 23.
It happens. After time t5, the tip of the detection rod ceases contact with the lower surface of the slab and becomes free, so the inclination angle increases again due to the action of the balance weight 70 and returns to the original inclination angle α at time t6 after a certain period of time.

If torch sag remains attached to the lower edge of the front and rear ends of the slab, the inclination angle of the detection rod changes as shown by the solid line 21 in Fig. 2, and between times L2 and t9, the detection rod The inclination angle decreases to the minimum value T determined by the thickness of the torch sag, and when the torch sag passes, it returns to the inclination angle β determined by the bottom surface of the slab. If torch sag is also attached to the bottom edge of the rear end of the slab, the inclination angle of the detection rod becomes smaller than β due to the torch sag between time t4 and t5, and decreases to the angle γ2 around 1 determined by the thickness of the torch sag, but after that, the bottom surface of the slab The tip of the detection rod separates from the edge t6
At that time, the balance weight returns to the original angle of inclination α.

If there is a torch sag remaining on the bottom edge of the slab, as mentioned above, between times t2 and t3 and between times 14 and 15, the inclination angle will rapidly decrease to T1 and/or γ2 and return to angle β, so the inclination angle should be changed. If we differentiate with respect to time, we get
Figure 5 shows the time transition, and between times 12 and 13, a
, b, between times t4 and t6, the minimum and maximum values are shown as at times c and d, respectively, so find the difference (ba) and (dC) between these minimum and maximum values and determine this in advance. Comparing it with the determination setting value X input into the apparatus, if (b-c)≧x and (d-c)≧X, it can be determined that the remaining number of torches is sagged.

<Example> An example of the present invention will be described with reference to FIGS. 1 and 3.

The slab 1 moves on the conveyance table roller 3 in the direction of the arrow. Below the path line between the conveyance table rollers 3, a plurality of detection rods 4 are installed in the slug width direction, which are attached to the rotating shaft 5 via bearings. It usually protrudes about 50 to 100 mm above the pass line,
Even when the shape of the slab is bad, such as when it is warped, it comes into contact with the bottom surface of the slab.

In addition, a tilt angle detector 6 is attached to each of the plurality of detection rods 4 (see Fig. 3), and the change in the tilt angle of each detection rod 4 is determined via a connecting lead wire 8. Device 9
By feeding the torch into the torch, it is possible to individually determine the presence or absence of sagging for each detection rod, and it is also possible to detect partial torch sag, as shown in FIG. 6(b). The balance weight 7 serves to return the detection rod 4 to its original position after the rear end of the slab has passed, and to prevent the detection rod 4 from bouncing while in contact with the slab 1 and press it with sufficient pressure. It is something.

If the determination device 9 determines that there is sagging, the warning device 10 issues an alarm to the operator or sends the detection information to the upper process computer 11 to return the slab to the sag removal device again and perform control such as removing torch sag. is possible.

In the embodiment described above, the balance weight 7 was used as a means for pressing the detection rod 4, but as shown in FIG. For the spring hook provided, a tension spring 15 having an appropriate spring constant may be hooked to the metal fitting to press the other end of the crossing detection portion upward. In addition, as shown in FIG. 4, the tip of the detection rod 4 is made U-shaped in order to prevent wear of the contact portion with the slab, and a touch roller 16 is mounted between the two through a touch roller bearing 17, so that the touch roller It may be configured to rotate in contact with the lower surface of the slab.

<Effects of the Invention> The present invention has a configuration in which a plurality of detection rods are provided that are rotatable independently in the width direction of the slab in contact with the lower end of the slab, and the determination is made based on the change pattern of the time differential value of the inclination angle. Therefore, it is not affected by the shape or weight of the slab, and by installing multiple detection rods and detectors in the width direction of the slab, it is possible to detect partial sag. Accuracy has been greatly improved.

In addition, this device is composed of inexpensive equipment such as a detection rod, a detector, and a determination device, can be installed between one table roller, and is easy to maintain.

Furthermore, improvements in detection accuracy have resulted in labor savings.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of the present invention, FIG. 2 is a characteristic diagram showing an example of a change pattern of the detection rod inclination angle in the embodiment of the present invention, and FIG. 3 is a diagram showing the inclination angle according to the present invention. FIG. 4 is an enlarged perspective view of a detection unit, FIG. 4 is an enlarged perspective view of another tilt angle detection unit according to the present invention, and FIG. Characteristic diagram showing changes,
FIG. 6 is a schematic diagram of a slab with torch sagging. 1... Slab, 2... Torch sag (tip)
, 2'... Torch sagging (rear end), 3... Conveyance table roller, 4... Detection rod, 5...
・Rotation axis, 6... Tilt angle detector, 7.
...Balance weight, 8...Connection lead wire, 9
...judgment device, 10...alarm device, 11.
...Upper computer, 12...Rotation hair ring,
13... Spring fixing member, 14... Spring hook, 15... Spring,
16... Touch roller, 17... Touch roller bearing, 20... Characteristic curve without sag, 21... Characteristic curve with sag, 22... Characteristic curve of warped slab, 23...Characteristic curve of downward warped slab. Patent applicant Kawasaki Steel Corporation Figure 1 Slab tip arrival Figure Figure R Figure Figure (b) (Time)

Claims (1)

[Claims] This is a device for detecting torch sag attached to the lower part of the slab end on a continuously cast slab conveyance table, and is attached to a rotating shaft located under the pass line of the conveyance table, so that one end is pressed against the bottom surface of the slab. The present invention is equipped with a plurality of detection rods that are pushed upward, a device that detects changes in the inclination angle of the detection rods as the slab is transported, and a determination device that determines the presence or absence of torch sag from the change in the inclination angle. Features: Torch sag adhesion detection device for continuously cast slabs.