JPH0758177B2 - Radiation pipe thickness measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a pipe manufacturing line such as a seamless steel pipe (seamless pipe) by hot working, in which the thickness of the pipe during rolling, particularly the deviation of the wall thickness ( Uneven thickness) to a radiation pipe wall thickness measuring device capable of measuring the thickness deviation.

(Prior Art) Conventionally, in a hot-rolled pipe manufacturing line, there is a track record of measuring the wall thickness of a pipe by using ultrasonic waves, but it is sufficiently satisfied with respect to the measurement accuracy required by the consumer. I didn't get it. However, there is no record of measurement of pipe wall thickness using radiation, especially measurement of uneven wall thickness of pipe.

(Problems to be solved by the invention) However, by making it possible to measure the wall thickness of the pipe during rolling, defective thickness can be quickly detected by measuring uneven thickness, and the usable range can be determined to increase the yield. However, it was an important issue to be solved to improve quality and improve productivity.

In view of the above points, the present invention effectively solves the problems of the prior art, the measurement of the uneven thickness of the pipe is reliable, its quality is improved, its yield is improved, and its productivity is improved. An object is to provide a thickness measuring device.

(Means for Solving the Problems) In order to achieve such an object, the present invention provides a movable carriage provided so as to be movable in a direction perpendicular to an axial movement direction of a pipe provided horizontally, A column whose lower end is provided on the horizontal plane of the movable cart perpendicularly to the axial movement direction of the pipe, a first frame provided vertically movable along the vertical plane of the column, and the pipe A first radiation source container that is mounted on the first frame in a horizontal direction in a vertical plane with respect to the axial movement direction of the pipe and irradiates the pipe with radiation, and is mounted on the first frame facing the first radiation source container. A first detector for detecting a radiation dose from the first radiation source container that has passed through the pipe, and a second detector that is vertically movable along the vertical surface of the column without contacting the first frame. Of the frame and the pipe Second and third radiation source containers which are mounted on the second frame and irradiate the pipe with radiation, respectively, inclined by 30 degrees with respect to a vertical line in a plane perpendicular to the axial movement direction, and the second radiation source container.
And a second and a third detector that are provided in the second frame so as to face the third radiation source container and detect a radiation dose from the second and the third radiation source containers transmitted through the pipe. It is characterized in that the three radiations applied to the pipe from the first, second and third radiation source containers form equilateral triangles intersecting with each other on an intermediate circle between the inner circumference and the outer circumference of the pipe. .

(Operation) With such a technical means, an equilateral triangle is formed on the intermediate circle between the outer circumference circle and the inner circumference circle of the pipe by the three radiations applied to the pipe being hot rolled from the radiation source container. ,
Three sets of radiation source containers and detectors are arranged to face each other, and it is configured to move up and down according to the size of the pipe without breaking this equilateral triangle. Therefore, uneven thickness of the pipe is measured, and defective products can be found. Easy, improve the quality of the pipe and improve its productivity.

(Example) Next, the Example of this invention is described in detail based on drawing.

FIG. 1 shows a schematic configuration diagram of an embodiment of the present invention.
Is a front view thereof, (B) is a side view thereof, FIG. 2 is an enlarged view of a main part of FIG. 1, FIG. 3 is a schematic configuration diagram of the first frame moving mechanism of FIG. 2, and (A) is A front view thereof, (B) a side view thereof, FIG. 4 similarly showing a schematic configuration diagram of a second frame moving mechanism, (A) a front view thereof, (B) a side view thereof, and (C) thereof. It is a top view. 1 to 4, the radiation pipe wall thickness measuring apparatus 100 is mainly composed of a moving carriage 1, left and right columns 2, 2, a first radiation source container 4 and a detector 5, a first frame 6, and a first frame 6. 2, the third source container 7,
8 and detectors 9 and 10, a second frame 11, a first frame moving mechanism 12 and a second frame moving mechanism 13.

The movable carriage 1 is installed by the wheels 61 on the rails 60 so that it can move at a right angle, while the horizontally installed pipe 62 moves in the axial direction. As a measuring and positioning means for the moving carriage 1, a carriage driving motor 14, an air cylinder 52 and a stopper 53 are provided, and the carriage driving motor 14 moves the moving carriage 1 from offline to online (measurement position) of the pipe 62. , Stop near the measurement position. After this stop, the air cylinder 52 is extended, the movable carriage 1 is pushed in the direction P of the arrow, brought into contact with the stopper 53, and is reliably positioned at the measurement position.

The columns 2.2 are each formed in the shape of a gate, the lower end of which is fixed upright on the surface of the moving carriage 1 and the upper end of which is connected by the connecting beam 3 so that the distances L1 and L2 are kept equal.

As shown in FIG. 3, the first frame 6 is formed in a U-shape with an upper opening, and the bottom surface 6A projects by the length dimension D, and the first radiation source container 4 and the detector are placed on the bottom surface 6A. 5 and the pipe 62
It is installed horizontally, facing in the plane perpendicular to the direction of movement of the axis.

The first frame moving mechanism 12 includes a guide shaft 18 supported by fixed bearings 17, 17 provided above and below the vertical surface of the left and right columns 2, 2 and a bearing portion fixed above and below the first frame 6. 19,1
Slide part consisting of slide bearings 20 and 20 provided in 9
Along with 63, two screw jacks 26, 26 provided between the bottom surface 6A of the first frame 6 and the moving carriage 1, a turbo motor 23, a speed reducer 24, couplings 25, 27 and a connecting shaft 2
Servo motor 23
The screw jacks 26, 26 are moved up and down through the speed reducer 24 and the couplings 25, 27 by the driving of the above, and the first frame 6 is movable in the vertical direction.

The screw jacks 26, 26 are connected by a connecting shaft 28 and move the first frame 6 up and down in parallel in synchronization with each other. Therefore, the first radiation source container 4 and the detector 5 mounted on the first frame 6 sandwich the pipe 62 and vertically move up and down to select the measurement position.

As shown in FIG. 4, the second frame 11 is formed in a square shape, and the upper and lower surfaces 11A and 11B facing each other have the second and third radiation source containers 7 and 8 and the second and third detectors. 9,10 are 30 with respect to the vertical line OO in the plane perpendicular to the axial movement direction of the pipe 62.
It is equipped with a tilt.

The second frame moving mechanism 13 is fixed above and below the second frame 11 and the guide shaft 18A supported by fixed bearings 17A and 17A provided above and below the vertical surface of the left and right columns 2,2. The rotation of the servomotor 23 is passed through the sprocket wheel 30, the chain 31, and the sprocket wheel 32 of the speed reducer 24 together with the slide portion 65 including the slide bearings 20A and 20A provided on the bearing portions 19A and 19A, and then the second frame 11 of the second frame 11 is rotated. Two screw jacks 26 provided between the bottom surface 11A and the movable carriage 1
It has a drive unit 66 for transmitting to the A and 26A, and the coupling 27A and the connecting shaft 28A synchronize the two screw jacks 26A and 26A to raise and lower the second frame 11 in parallel. By the way, between the second frame 11 and the moving carriage 1, the second and third radiation source containers 7 and 8 and the detectors 9 and 10 are held in a substantially vertical state, and compared with the first frame 6, The servo motor 23 is shared because the gap is very small and there is no room to separately provide it.

In addition, the first frame 6 and the second frame 11 are juxtaposed to the columns 2 and 2 so that the slide portions 63 and 65 are displaced from each other so that they can be vertically moved up and down without coming into contact with each other. .

Further, reference numerals 21 and 29 denote cylindrical combination cases provided on the jafts of the guide shafts 18 and 18A and the screw jacks 26 and 26A for the purpose of anti-corrosion measures by a scale. 22 is a shielding plate.

Since the pipe 62 is hot rolled, each source container 4,7,8
Also, the detectors 5, 9 and 10 are housed in a jacket case to take measures against heat insulation. Further, the radiation source container 4 and the detector 5 use, for example, a straight edge and a level, which are not shown, to check the tilted state of the first frame 6 during the ascending and descending. Similarly, the radiation source containers 7 and 8 and the detectors 9 and 10 use, for example, a straight-edge angle indicator (not shown) to confirm the tilted state of the second frame 11 while moving up and down. .

Next, FIG. 5 shows the principle of pipe measurement according to the present invention. In the figure, an arrow A1 indicates a radiation irradiation direction from the first radiation source container 4 to the first detector 5, the absorbed radiation amount when passing through the pipe 62 is B1, and the thicknesses of the portions are x ₁ and x ₃ . To do. Further, the arrow direction A2 is the irradiation direction of the radiation from the second source container 7 to the second detector 9, and the absorbed radiation dose is B2, and the thickness of the portion is
Let x ₁ and x ₂ . The direction of arrow A3 is from the third radiation source container 8 to the third
This absorbed radiation dose is determined by the direction in which the radiation is applied to the detector 10.
B3, the thickness of that portion is x ₂ , x ₃ . This arrow direction A1, A
Move the second frame up and down so that A2 and A3 form an equilateral triangle having an apex on the middle circle between the outer circle and the inner circle of the pipe 62 and move the apex formed by the arrow directions A2 and A3 to the outer periphery. After positioning it on the middle circle between the circle and the inner circle, move the first frame up and down to make the vertex formed by the arrow directions A1 and A2 and A1 and A3 the middle circle between the outer circle and the inner circle. Position it on top.

At this time, the following expressions (1), (2), and (3) are established.

x ₁ + x ₃ = B 1 (1) x ₁ + x ₂ = B 2 (2) x ₂ + x ₃ = B 3 (3) To obtain the thickness x ₁ , formula (1) + (2) - by _{(3), 2x 1 = B1} + B2-B3 _{Thus, x 1 = (B1 + B2} -B3) / 2 _{Similarly, x 2 = (B2 + B3} -B1) / 2 x 3 = (B1 + B3-B2) / 2 the computation process By doing this, the wall thicknesses x ₁ , x ₂ and x ₃ are
The uneven thickness condition of is measured. According to this equilateral triangle measurement method,
If the apex of this triangle is on the middle circle between the outer circle and the inner circle of the pipe 62, x ₁ , x ₂ and x ₃ have almost no effect on this position variation even if the measurement position of the pipe 62 fluctuates slightly. , It is possible to determine the uneven thickness state.

Next, FIG. 6 shows a schematic block diagram of another embodiment of the measuring and positioning means of the movable carriage. In the figure, the measurement positioning means mainly comprises a jack stopper 48, a hydraulic cylinder 49, a locking metal fitting 50 and a link mechanism 51. Depending on the rolling line, depending on the size of the pipe 62, it may be displaced in the left-right direction. At this time, the movable carriage 1 is stopped immediately before the line center (measurement position), the hydraulic cylinder 49 is operated, and the link mechanism 51 clamps it in the approach direction. After that, the jack stopper 48 is pushed back to the measurement position so that the left-right position can be reliably adjusted.

Next, FIG. 7 shows a schematic configuration diagram of the elevation position measuring means of the first and second frames, (A) a front view thereof, and (B).
Is a plan view thereof. In the figure, the lifting position measuring means is
It is provided to accurately measure the ascending / descending positions of the first frame 6 and the second frame 11, and is mainly composed of a magnetic scale 42, a magnetic detection head 43, an origin calibration magnetizer 44, and an origin calibration magnetic switch 45. The long magnetic scale 42 is attached to the column 2 (fixed side), and the magnetic detection head 43 is attached to the first frame 6 or the second frame 11 (moving side). Further, the origin calibration magnetic body 44 and the magnetic switch 45 are for calibration of the reference origin. 46 is a cover for preventing iron powder and dust, 47
Is a dustproof brush provided on the cover 46.

Next, FIG. 8 shows a layout of the upper and lower limits of the first and second frames and the limit switch for the origin. In the figure, the upper limit, lower limit and origin calibration limit switches 34, 35, 36 provided on the column 2 and the first and second frames 6, 11
The upper limit, the lower limit, and the origin calibration switch locking pieces 37, 38, 39 provided at are for safety measures of the measuring apparatus 100. Further, the mechanical switches 40 and 41 further provided at the upper and lower limits of the first and second frames 6 and 11, respectively.
Prevent runaway.

(Effects of the Invention) As described above, according to the present invention, a moving carriage,
A column whose lower end is provided on the horizontal plane of the movable truck perpendicularly to the axial movement direction of the pipe, a first frame provided vertically movable along the vertical plane of the column, and the first frame. A first radiation source container for horizontally irradiating the pipe with one frame, a first detector for detecting the amount of radiation transmitted through the pipe, and the first frame along the vertical surface of the column. A second frame provided to be movable up and down without contacting with each other, and a vertical line in a plane perpendicular to the axial movement direction of the pipe, respectively.
Provided are second and third radiation source containers, which are installed on the second frame with an inclination of 30 degrees and irradiate the pipe with radiation, and second and third detectors for detecting the amount of radiation transmitted through the pipe, By forming an equilateral triangle in which the three radiations applied to the pipe from the first, second and third radiation source containers intersect each other on an intermediate circle between the outer circumference circle and the inner circumference circle of the pipe, The problem of the conventional technology, which was difficult to measure the wall thickness, especially the uneven thickness, was effectively solved, the uneven thickness of the pipe during rolling was easily measured on the production line, and defective products could be easily found, and its quality Improved, the usable range of the pipe is secured, the yield is improved,
There is an effect that the productivity is improved.

[Brief description of drawings]

FIG. 1 shows a schematic configuration diagram of an embodiment of the present invention, in which FIG. 1 (A) is a front view thereof, FIG. 1 (B) is a side view thereof, and FIG. 2 is an enlarged view of an essential part of FIG. FIG. 3 shows a schematic configuration diagram of the first frame moving mechanism of FIG. 2. FIG. 3A is a front view thereof, FIG. 3B is a side view thereof, and FIG. FIG. 5A is a front view thereof, FIG. 7B is a side view thereof, FIG. 5C is a plan view thereof, and FIG. 5 is a pipe measuring principle diagram of the present invention. FIG. 6 is a schematic configuration diagram of another embodiment of the measuring and positioning means of the movable carriage, FIG. 7 is a schematic configuration diagram of the elevating position measuring means of the first and second frames, and FIG. , The figure (B)
FIG. 8 is a plan view thereof, and FIG. 8 is an arrangement view of upper and lower limits of the first and second frames and limit switches for origin. 1: Moving carriage, 2: Support, 4: First radiation source container, 5: First detector,
6: 1st frame, 7: 2nd radiation source container, 8: 3rd radiation source container, 9:
2nd detector, 10: 3rd detector, 11: 2nd frame, 12: 1st frame moving mechanism, 13: 2nd frame moving mechanism, 14: truck drive motor, 18,18A: guide shaft, 26, 26A : Screw jack, 62: Pipe, 100: Radiation pipe wall thickness measuring device.

Claims (1)

[Claims] 1. A moving carriage that is horizontally provided and is movable in a direction perpendicular to a pipe that moves in an axial direction,
A pillar that stands upright on the movable carriage and is provided at right angles to each other with respect to the axial movement direction of the pipe, and a first frame that is vertically movable along a vertical surface of the pillar, A first radiation source container, which is installed in a horizontal direction within a plane perpendicular to the axial movement direction of the pipe of the first frame, and irradiates the pipe with radiation, and a first radiation source container facing the first radiation source container to the first frame. A first detector equipped to detect the radiation dose transmitted by the radiation source container through the pipe;
A second frame, which is vertically movable along the vertical surface of the column without contacting the first frame, and an inclination of 30 degrees with respect to a vertical line in the vertical direction with respect to the axial movement direction of the pipe. And a second and third radiation source container mounted on the second frame and irradiating the pipe with radiation, respectively, and a second radiation container mounted on the second frame facing the second and third radiation source containers and transmitting through the pipe. The second and third detectors for detecting the respective radiation doses from the second and third radiation source containers are provided, and the pipes are irradiated from the first, second and third radiation source containers. A radiation pipe wall thickness measuring device, characterized in that three radiations form an equilateral triangle intersecting each other on an intermediate circle between an outer circumference circle and an inner circumference circle of the pipe.