JPH0252979B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for detecting protrusions on the surface of a slab.

[Prior Art] In order to protect devices placed close to the slab surface, it may be necessary to detect protrusions on the slab surface in advance. This will be explained in the case of a current flaw detector. ITV is a method for detecting surface flaws (vertical cracks, horizontal cracks, pinholes, baldness, etc.) in slabs manufactured by continuous casting in a hot state.
There are various methods such as laser method, induction heating method, and eddy current method.

The basic principle of the eddy current method is that when a metal material to be inspected is inserted into a coil through alternating current or brought close to it, an induced current called an eddy current flows inside the metal through the alternating magnetic field created by the coil. occurs. The size and change of this eddy current are of course related to the magnitude and frequency of the alternating current flowing through the coil, but also the distance between the metal and the coil, the dimensions of the metal, the electrical inductivity, etc.
Affected by magnetic permeability, cracks, etc. However, as it is, the materials of these metal materials,
Technically, changes in composition, dimensions, and shape all change the eddy current and are measured as changes in the impedance of the coil, so it is accepted that there are some changes in the metal material, but it is not possible to determine the cause of the change. It is not possible to know what is based on it. Fortunately, the alternating voltage detected as the coil end voltage contains three pieces of information: amplitude, phase, and modulation, so unnecessary conditions that affect eddy currents can be removed, classified, and processed. be able to.

By the way, the most important thing in this eddy current method is the inspection object and the eddy current testing coil (hereinafter referred to as the probe).
The smaller the gap, the better the detection ability. Therefore, it is necessary to minimize the gap between the probe for detecting vertical flaws (flaws in the longitudinal direction of the slab) and horizontal flaws (flaws in the width direction of the slab) on the surface of the continuous cast slab and the continuous cast slab. on the other hand,
If the set gap is shortened, there is a risk that abnormal protrusions (spatter caused by torch cutting, slag adhesion due to failure in slag removal, stepped part, crops due to failure in cutting, adhesion of burrs, etc.) may hit the probe and damage the probe.

Therefore, it is necessary to detect abnormal protrusions in advance to prevent damage to the probe, and for this purpose, for example, a device for detecting protrusions on the surface of a hard plate is disclosed in Japanese Patent Publication No. 46-42138. It has been known.

[Problem to be Solved by the Invention] The above-mentioned Japanese Patent Publication No. 46-42138 discloses a surface protrusion detection device for manufacturing a hard plate-like body such as a glass plate or a synthetic resin plate. , is a device that only detects protrusions on the surface of a hard plate.
The protrusions are also foreign matter such as insoluble matter in the galaf raw material, and it is unlikely that the foreign matter will destroy the equipment installed in the production line.
However, when manufacturing slabs in the steelmaking process, an eddy current flaw detector is installed to detect defects on the front and back surfaces of the slab, as well as defects that have penetrated into the inside of the slab. There was a problem of damage due to abnormal protrusions.

[Means for Solving the Problems] The present invention was made to solve the above-mentioned problems regarding slabs, and it mechanically detects abnormal protrusions on the slab surface in advance and prevents damage to equipment close to the slab surface. The aim is to provide a device to prevent this.

The device for detecting protrusions on the surface of a slab according to the present invention includes supports 3 disposed on both sides of a slab 1 being transported, a drive shaft 5 rotatably supported between both supports 3, and a drive shaft 5 that rotates. A driving device 8 that moves, one end of a first link 13 is connected to the drive shaft 5, and a second
A parallel link mechanism 12 in which one end of the link 14 is connected to the support body 3, an elevating frame 21 connected to the other ends of the first link 13 and the second link 14 and arranged to cross the slab 1, and an elevating frame. 21 and is rotatably attached to the lifting frame 21; a detection plate extending along the lifting frame 21 and attached to the lifting frame 21 via a spring so as to be tiltable and restorable in the slab conveying direction; 25 and a protrusion detection device 2 consisting of a means 30 for detecting the tilting of the detection plate 25, a slab position detection device 49 is installed upstream of the protrusion detection device, and a retractable excessive current flaw detection device is installed downstream of this protrusion detection device. The gist of the present invention is a device for detecting protrusions on a slab surface, which is characterized by being equipped with a device 47.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is a perspective view of the apparatus of the present invention. Although this figure only shows the device placed above the slab 1, similar devices are also placed below the slab 1.

As shown in FIG. 1, pillars 3 are provided on both sides of the slab being transported. This pillar 3
Although not shown, it is part of a portal frame that straddles the slab 1.

A drive shaft 5 is spanned between both columns 3.
Both ends of the drive shaft 5 are supported by bearings 6 fixed to the pillars 3, respectively.

An air cylinder 8 is attached to one of the columns 3, and a rod 9 of the air cylinder 8 is connected to one end of the drive shaft 5 via an arm 10.

In addition, a parallel link mechanism 12 that includes a first link 13 and a second link 14 on both columns 3, respectively.
is installed. One end of the first link 13 is connected to the drive shaft 5, and one end of the second link 14 is connected to the pin 1.
5, respectively. The pin 15 is supported by a bearing 16 fixed to the column 3.

An elevating frame 21 is arranged between both supports 3 so as to cross the slab 1. The other ends of the first link 13 and the second link 14 are connected to both sides of the elevating frame 21 via pins 17 and 18, respectively. (See FIG. 2) The elevating frame 21 moves up and down while maintaining a horizontal posture by the movement of the parallel link mechanism 12.

A touch roll 23 extending along the lower part of the lifting frame 21 is rotatably attached. The length of the tatsuchi roll 23 is smaller than the width of the slab 1.

Further, as shown in FIG. 3, a detection plate 25 is attached to the rear side of the elevating frame 21 so as to be tiltable back and forth with a pin 26. The detection plate 25 extends along the lifting frame 21 and is slightly longer than the width of the slab 1. The detection plate 25 is divided into upper and lower parts so that the height can be adjusted, and the upper and lower members are connected by screws 27.
are connected with.

A striker 29 is fixed to the detection plate 25. The striker 29 is in contact with an arm 31 of a limit switch 30 attached to the lifting frame 21.

FIG. 4 shows the vertical posture holding mechanism 33 of the detection plate 25. As shown in FIG. As shown in the drawing, lifting frame 2
1 is attached to a sleeve 34, and a rod 35 facing the detection plate 25 is slidably inserted into the sleeve 34. A stopper 36 is fixed to the front end of the rod 35, and a stopper 37 is attached to the rear end of the rod 35 passing through the hole 28 of the detection plate 25. Further, a push rod 39 passes through the elevating frame 21, and a push metal fitting 40 that contacts the detection plate 25 is fixed to the rear end of the push rod 39. A spring receiver 41 is provided in the middle of the push rod 39, and a coil spring 42 is attached between this and the lifting frame 21.

In FIG. 4, the sleeve 34, rod 35, etc. are attached to the upper lifting frame 21, the push rod 39, the push metal fitting 4, etc.
0, etc. are shown on the lower elevating frame 21, but all these members are provided on the upper and lower elevating frames 21, respectively.

In the figure, 49 is a slab position detection device, and 47 is an eddy current flaw detector.

[Function] The function of the device of the present invention will be explained below. For convenience of explanation, the upper device will be described, but the lower device is exactly the same.

Slab 1 is sent in the direction of arrow A by table roller 45 and passes through protrusion detection device 2 and current flaw detector 47 . When the tip of the slab 1 reaches the front of the protrusion detection device 2, the slab position detection device 49
detects this.

A control valve (not shown) is actuated by a signal from the slab position detection device 49, and the head side of the air cylinder 8 is pressurized. Thereby, the air cylinder 8 rotates the drive shaft 5 via the arm 10. As the drive shaft 5 rotates, the elevating frame 21 is lowered via the parallel link mechanism 12 until the touch roll 23 comes into contact with the surface of the slab 1.

The touch roll 23 rotates as the slab 1 moves while in contact with the surface of the slab 1. At this time, a preset gap (for example, 4 mm) is left between the lower end surface of the detection plate 25 and the surface of the slab 1.

If there is a protrusion on the surface of the slab 1 with a height equal to or greater than the set gap, it abuts against the lower end of the detection plate 25, and as the slab 1 moves, the detection plate 25 tilts forward around the pin 26. The striker 29 moves forward due to the tilting of the detection plate 25, and the limit switch 30 is activated.

The signal from the limit switch 30 causes the eddy current flaw detector 47 to retreat in a direction away from the surface of the slab 1. Further, the control valve is activated and the rod side of the air cylinder 8 is pressurized. As a result, the drive shaft 5 rotates and the elevating frame 21 is retracted upward together with the detection plate 25.

When the detection plate 25 tilts around the pin 26, the push rod 39 is pushed forward by the detection plate 25, and the coil spring 42 is compressed. Then, when the elevating frame 21 rises, the detection plate 25 returns to its original position by the force of the compressed coil spring 42. At this time, the detection plate 25 is stopped in a vertical position by the stopper 37 whose position is adjusted by the stopper 36.

[Effects of the Invention] As described above, in the present invention, the detection plate is attached to the lifting frame together with the tatsuchi roll, so even if the thickness of the slab changes or the slab is warped, the slab surface and the detection plate The gap with the lower (upper) end of is always constant. Therefore, protrusions with a height exceeding the set gap can be reliably detected despite changes in the thickness of the slab.

Further, since the elevating frame is attached to the support column through a parallel link mechanism, the elevating frame can always maintain a horizontal posture. Therefore, regardless of the height position of the lifting frame,
The distance between the lower (upper) end of the tatsuki roll and the lower (upper) end of the detection plate is constant, that is, the set gap is constant.

When a protrusion is detected, the detection plate rises to prevent damage to the detection plate itself, and after rising, it returns to its original state due to the restoring force of the spring and is ready to detect the next protrusion. When a protrusion is detected, it retreats away from the slab.
Contact with protrusions on the slab surface can be prevented.
It is possible to detect protrusions on slabs over a long period of time.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the entire device of the present invention;
3 is a side view of the parallel link mechanism of the device shown in FIG. 1, FIG. 3 is a side view of the detection plate of the device, and FIG. 4 is a side view of the vertical posture holding mechanism of the detection plate. 1...Slab, 2...Protrusion detection device, 3...
Pillar, 5... Drive shaft, 13, 14... Link, 2
1...Lifting frame, 23...Tatsuchiroll, 2
5...Detection plate, 30...Limit switch, 45
...Table roller, 47 ...Eddy current flaw detection device, 4
9...Slab position detection device.

Claims (1)

[Claims] 1 Supports 3 disposed on both sides of the slab 1 to be transported, a drive shaft 5 rotatably supported between both supports 3, a drive device 8 for rotating the drive shaft 5, and a first link 13. a parallel link mechanism 12 having one end connected to the drive shaft 5 and one end of a second link 14 connected to the support body 3;
3 and the other end of the second link 14, and is arranged to cross the slab 1.
1. A touch roll 23 extending along the lifting frame 21 and rotatably attached to the lifting frame 21; a touch roll 23 extending along the lifting frame 21 and attached to the lifting frame 21 via a spring so as to be tiltable and restorable in the slab transport direction; detected plate 2
5 and means 30 for detecting the tilting of the detection plate 25
A protrusion detection device 2 is installed, and a slab position detection device 49 is installed upstream of this protrusion detection device.
An apparatus for detecting protrusions on a slab surface, characterized in that a current flaw detector 47 is provided on the downstream side so as to be retractable.