JPS61118654A - Eddy current flaw detection apparatus - Google Patents

Abstract

PURPOSE:To make it possible to perform the flaw detection of a hot rolled material efficiently with good accuracy, by allowing the eddy current flaw detection probes attached to a lift table and a traversing table to well follow the surface of the hot rolled material during running. CONSTITUTION:Guide apparatuses 41, 51 guide a hot rolled material W to a predetermined position to prescribe a running position. In an up-and-down flaw detection machine 1, a drive apparatus drives lift tables 6, 8 so as to move the same to the direction approaching the rolled material W during running to contact touch rollers 12, 14 with the rolled material W under pressure and the eddy current flaw detection probes 11, 13 attached to the lift tables 6, 8 are allowed to follow the upper and upper surfaces of the rolled material W. In a side surface flaw detection machine 21, the drive apparatus drives a traversing table 24 to the direction approaching the rolled material during running to contact a touch roller 30 with the rolled material W and the eddy current flaw detection probe attached to the traversing table 24 is allowed to follow the side surface of the rolled material W.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an eddy current flaw detection device, and more particularly to a device for performing eddy current flaw detection on a hot rolled material while it is running.

(Prior Art) Conventionally, as a method for inspecting surface flaws in hot-rolled flat steel, it has been common to cool the flat steel and then visually inspect the flaws or perform magnetic flaw detection.

(Problems to be solved by the invention) However, in all of the above methods, the work efficiency was poor because each flat bar was inspected one by one after being cooled, and there was a large difference in the ability of the operator to detect flaws by visual inspection. . Therefore, it may be possible to perform eddy current flaw detection (eddy current testing) on running flat steel during hot rolling or immediately after exiting the finishing mill, but flat steel running at high speeds vibrates a lot, making the flaw detection accuracy difficult. difficult to raise.

This invention has been made in view of the above points, and an object thereof is to provide an eddy current flaw detection device that has excellent followability of an eddy current flaw detection probe to the material to be inspected and can accurately and efficiently detect flaws in hot rolled materials. It is.

(Means for Solving the Problems) However, the eddy current flaw detection device of the present invention is equipped with an eddy current flaw detection probe and a touch roller that face each of the upper and lower surfaces of the hot rolled material while it is running. an upper and lower surface flaw detector comprising a pair of elevating tables that are guided so as to be able to move closer and further apart, and a drive device that drives each of the elevating tables toward and away from the rolled material and presses the touch roller against the rolled material; A pair of traversing tables each equipped with an eddy current flaw detection probe and a touch roller facing each side of the rolled material and guided so as to be able to move toward and away from the rolled material; A side flaw detector equipped with a driving device for driving and pressing the touch roller against the rolled material, and a guide device for guiding the rolled material are arranged in the running direction of the rolled material. This is an eddy current flaw detection device.

In the present invention, the arrangement order of the upper and lower surface flaw detectors, the side surface flaw detectors, and the guide device can be selected as appropriate, but it is preferable to provide a guide device at least at the inlet of the hot rolled material.

(Function) In the eddy current flaw detection device of the present invention, the guide device guides the hot rolled material to a predetermined position and regulates the traveling position, and in the upper and lower surface flaw detector, the drive device guides the hot rolled material to a predetermined position and controls the traveling position of the hot rolled material. The touch roller is brought into pressure contact with the rolled material by driving in the approaching direction, and the eddy current flaw detection probe attached to the lifting platform is made to follow the upper and lower surfaces of the rolled material. In addition, in the side surface flaw detector, the drive device drives the traverse table in a direction approaching the traveling rolled material, presses the touch roller against the rolled material, and brings the eddy current flaw detection probe attached to the traversal table into contact with the rolled material. Follow the sides. When the end of the rolled material passes, the elevating table and the traversing table are each driven by a drive device in a direction away from the rolled material, so that the eddy current flaw detection probe, touch roller, etc. are not damaged by the end. be evacuated to the position.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

In the figure, reference numeral 1 denotes a top and bottom surface flaw detector, in which a pair of left and right levers 4.4 and 5.5 are swingably pivoted to a column 3a of a gate-shaped frame 3 that is erected and fixed to a base 2. A lifting platform 6 is swingably connected to the tip of the lever 5 via a horizontal shaft 7.
An elevator platform 8 is swingably connected to the tip of the platform by a horizontal shaft 9. On the upper lifting platform 6, a wide eddy current flaw detection probe 11 facing the upper surface of the traveling flat steel W is fixedly attached, and two touch rollers 12 facing the flat steel W (with their outer peripheries) are fixedly mounted. It is pivoted. Also, the lower lifting platform 8
A wide 1] eddy current detection probe 13 facing the lower surface of the flat bar W is fixedly attached thereto, and two touch rollers 14 facing the flat bar W (with their outer peripheries) are pivotally mounted. . 15 is an air cylinder for driving the lifting platform 6, and the end of the cylinder is attached to a bracket 1 fixed to the upper beam 3b of the frame 3.
6, and the tip of the piston rod 15a is pivotally connected to a shaft 7 for supporting the lifting platform 6. Also, 17 is the elevator platform 8
An air cylinder for driving, the end of which is pivotally connected to a bracket 18 fixed to the base 2, and the piston rod 1
The distal end of the arm 19 is pivotally connected to the distal end of the arm 19, and the base end of the arm 19 is fixedly connected to a rotation shaft 20 fixed to the base of the lever 5 for supporting the lifting platform 8.

Next, 21 is a side flaw detector, which is installed on the exit side of the upper and lower surface flaw detector 1, and has two rods 23 fixed horizontally and parallel to a box-shaped frame 22 fixed to the base 2. The rampart 2
4.24 is slidably guided by both rods 23. The traversing table 24 is made up of a slider 26 equipped with a bush 25 that is slidable along the rod 23, and a roller block 28 that is swingably attached around a pin 27 that is erected on the slider 26. A substantially U-shaped eddy current flaw detection probe 29 facing the side surface of the flat steel W is fixedly attached to the roller block 28 at the center thereof.
Two touch rollers 30 with V-grooves facing each other (outer peripheral portions) are pivotally mounted on the side surfaces of the flat steel W. 31 is the transverse platform 24
This is an air cylinder for driving, and the cylinder is attached to the frame 22.
The tip of the piston rod 31a is connected to the slider 26. 32 is a guide block equipped with a guide hole 33 for guiding the flat steel;
It is fixedly installed in the center of the front wall.

Reference numeral 41 denotes a roller-type guide device disposed on the entrance side of the upper and lower surface flaw detector 1, and a horizontal roller 4 that supports the lower surface of the flat steel W
2 is pivotally supported on the frame 43, and a guide roller 44 with a V groove facing the side surface of the flat steel W is mounted on the frame 43.
A pair of levers 45 and 45 whose bases are pivotally connected to the levers 3 and 45 are each pivoted at the tip end thereof. A horizontal threaded rod 46 rotatably attached to the frame 43 has reverse threads carved into it near both ends, and female threaded blocks 47 and 48 protruding from the top surface of the threaded blocks 47 and 48 are screwed into each of the threaded parts. When the pin engages with an elongated hole 49 formed on the lower surface of each lever 45, and the threaded rod 46 is rotated by an operation handle (not shown), both levers 45.4
5 is designed to rotate in the opposite direction. 50 is a guide plate fixed to each lever 45. On the other hand, 51 is a roller type guide device arranged on the exit side of the side flaw detector 21.
Two horizontal rollers 52 for supporting the lower surface of the flat steel W are pivotally supported on the base 2 by brackets 53, and are pivoted to a gate-shaped frame 54 erected on the base 2 so as to be swingable around a horizontal axis. A horizontal roller 56 is pivotally supported at the tip of a lever 55, and the lever 55 is rotated by an air cylinder 57 to raise and lower the horizontal roller 56.

The eddy current flaw detection device 60 consisting of the above devices is used by being disposed between rolling mills near the finishing mill of a hot rolling line for flat steel W or on the exit side of the finishing mill.

First, the moving flat bar W is regulated in position by a horizontal roller 42 and guide rollers 44, 44 whose spacing is adjusted by a threaded rod 46 depending on the length of the flat bar W in the guide device 41 on the entrance side. Next, in the upper and lower surface flaw detector 1, the lifting tables 6 and 8 are moved by the air cylinders 15 and 17 to the flat steel W.
touch rollers 12 and 1.
4 are pressed against the upper and lower surfaces of the flat steel W, respectively. Air cylinder 1 is used to deal with the vertical vibration of the flat steel W while it is running.
Due to air cushions 5 and 17 selected at appropriate air pressures, the lifting platforms 6 and 8 follow the flat steel well, and the probes 11 and 13 are maintained within a predetermined distance range from the upper and lower surfaces of the flat steel W. . In addition, since the lifting platforms 6 and 8 are also swingable around the horizontal axes 7 and 9, respectively,
The probes 11 and 13 follow the bending of the flat steel in the vertical direction well, and the followability is even more excellent. Next, in the side surface flaw detector 21, each traversing table 24 is driven by the air cylinder 31 in a direction approaching both sides of the flat steel W, and each touch roller 30, 30 is pressed against both sides of the flat steel W. In response to the horizontal vibration of the flat bar W while it is traveling, the traversing table 24 follows the flat bar W well due to the air cushion selected to have an appropriate air pressure in the air cylinder 31, and the probe 29 moves the flat bar W to the right.
is maintained within a predetermined distance from the side of the Furthermore, since the roller block 28 that supports the probe 29 and the touch roller 30 is swingable around the pin 27 that is perpendicular to the slider 26, the probe 29 can easily follow the bending of the flat steel in the horizontal direction. , the followability is even better. In the guide device 51, the flat bar W is pinched by a horizontal roller 52 and a horizontal roller 56 driven in the downward direction by an air cylinder 57, and the vertical position of the flat bar is regulated and vertical vibration is also suppressed. This is useful for improving the flaw detection accuracy in the side surface flaw detector 21, and also facilitates the introduction of the flat bar into equipment such as a rolling mill (not shown) at a later stage.

The tip of the flat steel W is sent into the eddy current flaw detection device 6o -10
- When the terminal is moved and the end portion passes through the mounting M60, the air cylinders 15 and 17 move the lifting platforms 6 and 8 away from the flat steel W, and the air cylinder 31 moves the traversing platform 24 away from the flat steel W. , to prevent damage to the eddy current deep damage probes 11.13 and 29, the touch 1]-ra 12.14.30, etc., caused by the flat steel terminals.

The present invention is not limited to the above-mentioned embodiments. For example, each lifting platform of the upper and lower surface flaw detector 1 may move up and down in a straight line to guide the flat steel toward and away from it, or the side surface flaw detector Each of the traversing tables 21 may be rotated by a lever and guided so as to move toward and away from the flat steel along an arcuate trajectory. In addition, in the above embodiment, since an air cylinder is used as the drive device for the lifting table and the traversing table, the air pressure of the air cylinder can be used to drive the flat bar toward and away from it and to suppress the touch roller. However, instead of this, for example, a combination of an electric actuator for driving the flat steel toward and away from it and a spring for pressing the touch roller may be used. Further, in the above embodiment, the probe and touch roller mounting portions of the lifting table 6.8 and the traversing table 24 have a neck that swings around an axis parallel to the flaw detection surface (horizontal axis 7.9 and vertical pin 27). However, if the distance between the centers of the touch rollers on both sides of the probe is small, or if the flat steel is locally bent, etc., the probe and touch roller installation may be fixed, such as by fixing the roller block 28 to the slider 26. It is also possible to adopt a configuration in which the part does not swing. Further, as guide devices for guiding the flat steel, the guide devices 41 and 51 mentioned above are used.
In addition, various roller-type or slide-type guide devices may be used, and the guide device may be installed at one or three locations.

The above description has been given of the case where this invention is applied to a flaw detection device for hot-rolled flat steel, but this invention can also be applied to flaw detection devices for various hot-rolled materials such as steel bars and sections in addition to flat steel. It is something.

(Effects of the Invention) As explained above, according to the present invention, the eddy current flaw detection probe that is attached to the lifting table and the traversing table can well follow the surface of the hot rolled material while it is running, and can be detected online with high precision and extremely efficiently.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway plan view of an eddy current flaw detection device showing an embodiment of the present invention, FIG. 2 is a partially cutaway plan view of the same, and FIG. 3 is a partially cutaway sectional view taken along the line A-A in FIG. 1. . 1... Upper and lower surface flaw detector, 4... Lever, 5... Lever, 6... Elevating platform, 7... Axis, 8... Elevating platform, 9
...Axis, 11...Eddy current flaw detection probe, 12...
Touch roller, 13... Eddy current flaw detection probe, 14.
...Touch roller, 15...Air cylinder, 17...
・Air cylinder, 19... Arm, 21... Side flaw detector, 23... Rod, 24... Traverse table, 26...
- Slider, 27... Bin, 28... Roller block, 29... Eddy current flaw detection probe, 30... Touch roller, 31... Air cylinder, 41... Guide device, 42... Horizontal roller, 44... Guide roller, 45... Lever, 46... Threaded rod, 51... Guide device, 52... Horizontal roller, 56... Horizontal roller, 57... Air cylinder , 60... Eddy current flaw detection device.

Claims (1)

[Scope of Claims] 1. A pair of elevating platforms each equipped with an eddy current flaw detection probe and a touch roller facing each of the upper and lower surfaces of the hot-rolled material during travel, and guided to move toward and away from the rolled material; A top and bottom surface flaw detector comprising a driving device for driving each of the lifting platforms toward and away from the rolled material and a drive device for pressing the touch roller against the rolled material; a pair of traversing tables each equipped with a probe and a touch roller and guided so as to move toward and away from the rolled material, each of the traversing tables being driven toward and away from the rolled material, and the touch rollers pressing the rolled material. An eddy current flaw detection device comprising: a side surface flaw detector equipped with a drive device; and a guide device for guiding the rolled material, arranged in an array in the running direction of the rolled material. 2. The eddy current flaw detection apparatus according to claim 1, wherein the eddy current flaw detection probe and the touch roller mounting portion of the lifting platform are supported so as to be swingable around a horizontal axis. 3. The eddy current flaw detection apparatus according to claim 1 or 2, wherein the eddy current flaw detection probe and the touch roller mounting portion of the traversing table are supported so as to be swingable around a horizontal axis.