JPS60187429A - Billet confirming device of seamless tube rolling line - Google Patents

Abstract

PURPOSE:To confirm number and size automatically, highten reliability and speed up work by calculating number, length and outer diameter of billets by information taken in by a two-dimensional optical sensor and comparing with set values. CONSTITUTION:Billets 21 placed on a fixed skid 24 are irradiated by a light 30, and projected image is taken in a camera 25. The picture is converted to electric signals and stored in a memory 26. Scanning is made in the direction of Y in a picture processing circuit 27, and outer diameter and number of billets are calculated. Then, the light 30 is put off and a light 29 is put on. The billets 21 are irradiated from above and reflected image is taken in the camera 25. Similarly, the picture is stored in the memory 26, and scanned in the direction of X in the picture processing circuit 27, and length of each billet is calculated. Calculated number, length and outer diameter of the billets are compared with set number, length and outer diameter in the picture processing circuit 27, and if they are different, an alarm signal is outputted and an alarm device 28 is operated. At the same time, carrying of the billets 21 to a heating furnace is deterred.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for checking the number, length, and outer diameter of steel slabs conveyed to a heating furnace in a seamless tube rolling line.

Figure 1 shows an example of a seamless tube rolling line.
A billet yard (not shown) is provided at the entrance of the rolling line in which a suitable amount of steel pieces can be temporarily placed. In this seamless tube rolling line, steel billets brought in from the earthworks by a carrier vehicle and temporarily placed are unloaded by a crane 1 onto a conveyor device 2 such as a loop truck, which is loaded into the mill line from the billet yard. etc. conveyance device 2
is carried to the entrance of the conveyance path 4 to the rotary heating furnace 3,
There, it is transferred to the carrier 5 by a claw crane or the like. The steel pieces transferred to the carrier 5 are transported by the carrier 5 to the rotary heating furnace 3, housed in the rotary heating furnace 3, and heated. The heated steel billet is taken out from the rotary heating furnace 3 and sent to a piercer 6, where it is pierced into a shell.

The shell is then sent to an elongator 7, where it is rolled for outer diameter and wall thickness, and then sent to a mandrel mill 8. The shell sent to the mandrel mill 8 is rolled there so that the wall thickness is thin and the outside diameter of the tube is small, and then sent to the sipe 9 where it is reduced and rolled to a predetermined outside diameter and becomes a blank tube. . Further, the raw tube is sent to a hardening facility 10 to be hardened, then cooled in a cooling bed 11 to perform quality control during the hot process, and then to a straightening machine 12.
sent to. The raw pipe sent to the straightening machine 12 is debent there, and then sent to the cooling bed 13 where quality control is performed again. The raw tube is then sent to an ultrasonic flaw detector 14, where it is inspected for flaws on the inner and outer surfaces.
sent to. The raw tube thus sent to the cutting machine 15 is cut into a predetermined size there and then sent to a processing step.

By the way, seamless pipe production lines produce a wide variety of products.

It is required to produce high-quality products in small quantities with high efficiency.

They are rolled in lots. Therefore, mixing of different materials, that is, replacement between lots, is absolutely not allowed.

Therefore, in seamless pipe manufacturing lines, the number, length, and outer diameter of steel slabs are checked at the inlet of the heating furnace, which is the receiving port. However, in the past, this checking work was performed manually, which not only made the work complicated but also less reliable.

Therefore, this invention was made to solve the above problems, and includes a fixed skid that is installed in a steel billet conveyance area to a heating furnace and supports a plurality of steel billets in parallel at appropriate intervals, and the fixed skid. A light that illuminates the steel piece above, a two-dimensional optical sensor that is located above the fixed skid and that images the steel piece on the fixed skid, and based on information captured by the two-dimensional optical sensor. It is characterized by comprising an image processing circuit that calculates the number, length, and outer diameter of the steel pieces and outputs an alarm signal when these values differ from set values, and an alarm that is activated by the alarm signal. has.

The present invention will be described below with reference to embodiments and drawings.

FIG. 2 is a perspective view showing the main parts of this invention, FIG. 3 is a front view conceptually showing the entire invention, and FIG.
The figure is a diagram for explaining the detection action.

As shown in the drawings, the device of the present invention includes a holding mechanism 22 that holds a plurality of steel pieces 21 in a predetermined position, measures the number, length, and outer diameter of the steel pieces 21, and measures the number, length, and outer diameter of the steel pieces 21, and A sensor mechanism 2 that determines whether the number, length, and outer diameter are specified, and issues an alarm if the number, length, and outer diameter are not specified.
It consists of 3.

The holding mechanism 22 is a loading platform 2 of a conveying device 2 such as a loop truck.
It is installed on a. This holding mechanism 22 is a loading platform 2a.
It is configured by fixed skids 24 fixedly installed at the front and rear parts of the carrier in a direction perpendicular to the traveling direction of the conveying device 2 such as a loop truck. and,
Arc-shaped recesses 24a are formed in the fixed skid 24 at predetermined intervals so that the steel pieces 21 are parallel to each other. The steel piece 21 is placed on these four arcuate parts 24a and is always held in a constant position.

The sensor mechanism 23 includes a camera 25 with a built-in two-dimensional image sensor installed above the travel path of the transport device 2 such as a loop truck, a memory 26 that stores images captured by the camera 25, and a memory 26 that stores images captured by the camera 25. The image processing circuit 27 that processes the stored image and determines whether it is correct or not, and its image processing time! f! ! It consists of an alarm device 28 which issues an alarm in response to an alarm signal output from r27, and lights 29 and 30 which illuminate the steel piece 21. The light 29 is installed at a position close to the camera 25 and illuminates the entire steel piece 21 placed on the fixed skid 24. Further, the light 30 is rod-shaped and is installed on the loading platform 2 of the transport device 2 such as a loop truck so as to be parallel to the fixed skid 24, and illuminates the back side of each steel piece 21.

The steel piece 21 placed on the fixed skid 24 is transported by a transport device 2 such as a loop truck into the field of view of the camera 25 and stopped there. Those steel pieces 21 are lights 30
The projected image is captured by the camera 25. The image captured by camera 25 is converted into an electrical signal by an image sensor within camera 25 and stored in memory 26 . The image stored in the memory 26 is scanned in the X direction by the image processing circuit 27 as shown in FIG.
~d6 is calculated, and the number n of steel slabs 21 is calculated. Light 30 is then turned off and light 29 is turned on. Then, the steel piece 21 is irradiated from above, and the reflected image is captured by the camera 25. Images captured by the camera 25 are stored in the memory 25 in the same manner as described above.
6, and further scanned in the X direction in the image processing circuit 27, and the lengths 11 to 16 of each steel piece 21 are calculated. The number n of steel slabs 21 calculated in this way,
lengths 11 to 16, outer diameters d, ~dau, and a preset number n in the image processing circuit 27; , length io
and outer diameter d. are compared with each other. If the steel pieces 21 do not have a predetermined number, length, and outer diameter, an alarm signal is output from the image processing circuit 27, and the alarm 28 is activated by the alarm signal.

At the same time, this alarm signal locks, for example, a claw crane or the like to prevent the steel piece 21 from being conveyed to the heating furnace 3.

In the above embodiment, two types of lights 29 and 30 are used, but if detection is possible, only the light 29 may be used. In the embodiment, the holding mechanism 22 for the steel billet 21 is installed on the conveying device 2 such as a loop truck, but this holding mechanism 22 may be installed on another truck 4. 2
1 to the heating furnace 3 from a predetermined place in the billet yard where
Anywhere within the steel billet conveyance area up to this point is acceptable. That is, during this period, the steel billet 21 is equipped with a first-in, first-out system, so that all lots can be checked no matter where the confirmation work is performed.

Furthermore, in the embodiments described above, a camera with a built-in image sensor is used as the optical sensor, but it goes without saying that other similar sensors such as an ITV camera can be used.

As explained above, according to the present invention, it is possible to automatically check whether the number, length, and outer diameter of steel billets in each lot have the predetermined number and dimensions, and if Since a warning is issued if foreign materials are mixed in, reliability is high and work can be speeded up.

[Brief explanation of drawings]

Fig. 1 is a layout diagram of each equipment showing a seamless tube rolling line, Fig. 2 is a perspective view showing a part of the apparatus of the present invention,
Figure 3 is a conceptual diagram showing the entire device of this invention;
The figure is a diagram showing image processing. In the drawings, 2... Loop truck, 2a... Loading platform, 3... Heating furnace, 21... Steel piece, 22... Holding mechanism, 23... Sensor mechanism, 24
...Fixed skid, 24a...Four arcuate parts, 25
...Camera, 26...Memory. 27... Image processing circuit, 28... Alarm device, 29.
30...Light. Applicant Nippon Kokan Co., Ltd. Agent Natsuo Shioya (and 2 others)

Claims (1)

[Scope of Claims] A fixed skid that is installed in a steel billet conveyance area to a heating furnace and supports a plurality of steel billets in parallel at appropriate intervals; a light that irradiates the steel billets on the fixed skid; a two-dimensional optical sensor located above a fixed skid to image the steel pieces on the fixed skid, and a number, length, and outer diameter of the steel pieces based on information captured by the two-dimensional optical sensor. Confirmation of steel billets in a seamless tube rolling line, characterized by comprising an image processing circuit that performs calculations and outputs an alarm signal when the values differ from set values, and an alarm activated by the alarm signal. Device. 1-