JP3111617B2 - Calibration device for transmission thickness gage - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a measuring device comprising a measuring source and a detector, in which a plurality of measuring units, for example, three measuring units are movable in parallel in the width direction for measuring the thickness of a rolled steel plate. A device for calibrating a measuring unit by sequentially inserting a sample plate as a reference relating to a rolled steel plate to be measured between a source and a detector of each measuring unit when configuring a transparent transmission radiation thickness meter. More particularly, the present invention relates to a calibration apparatus for a transmission-type radiation thickness meter that can save labor and ensure safety.

[0002]

2. Description of the Related Art A conventional example will be described below with reference to the drawings. FIG. 4 is a perspective view of one conventional example. In FIG. 4, a transmission type radiation thickness meter (hereinafter, referred to as a thickness meter) 30
The thickness of the rolled steel sheet is actually measured on the production line. This thickness gauge
Reference numeral 30 denotes a U-shaped frame 33 with wheels 34, two source containers 21 accommodated in the lower side of the U-shape, and two detectors 22 also accommodated in the upper side of the U-shape. Consists of The set of the source container 21 and the detector 22 constitutes a measuring section, and the two sets of measuring sections are arranged side by side in the width direction of the steel sheet. The two sets of measuring units measure the thickness at two locations in the width direction of the steel sheet, and determine the variation in the thickness in the width direction.

The radiation from the radiation source contained in the radiation source container 21, for example, β-rays, is radiated to a steel plate, a part of which is scattered and a part of which is transmitted therethrough, and the measurement radiation contained in the detector 22 It enters the ionization chamber, where an ion current proportional to the transmitted β dose is generated. In addition, there is a comparative ionization chamber that receives a constant β dose from a comparative source and generates a constant ion current. Each ion current of this comparative ionization chamber and the previous ionization chamber for measurement is
A comparison is made and drift correction is performed, and an operation for obtaining the thickness of the steel sheet is performed. A so-called differential method (two-signal comparison method), which is particularly excellent in accuracy and stability, is employed. The two measuring units are adjusted so that the measured values are the same using a sample plate as a reference so that the measured values are the same for steel plates having the same thickness. This is calibration for each measurement unit.

Next, a calibration method in a conventional example will be described. According to the position of each source container 21 of the thickness gauge 30,
On the surface of the lower side of the frame 33, four positioning fixtures
There are 35 sets. On the other hand, the sample plate 15 as a reference
A table 36 for mounting the table is prepared, and four legs of the table 36 are provided.
37 corresponds to the receiver 35. Therefore, by sequentially fitting the legs 37 of the table 36 to the set of two
36 is properly positioned with respect to each measurement unit, and calibration is performed for each measurement unit. The base 36 is provided with a hole for radiation passage at the center. The thickness gauge 30
At the time of calibration, the wheel 34 is moved to a predetermined place away from the production line and convenient for calibration.

FIG. 1 is a perspective view of another conventional example.
This will be described with reference to FIG. In FIG. 5, the thickness gauge 40
Is composed of a U-shaped frame 43 with wheels 44, two source containers 21 housed in the lower side of the U-shape, and two detectors 22 also housed in the upper side of the U-shape. This is essentially the same as the thickness gauge 30 in one conventional example, except that there is no holder 35. On the other hand, the sample plate is
15 are sequentially positioned properly for each measuring unit. The calibration device 50 mainly includes a base 45, a fixed plate 46, a rotating arm 47 for mounting a sample plate with a manual lever 48, and a positioning pin 49. The swivel arm 47 on which the sample plate 15 is placed at a predetermined position is rotated around the central axis of the fixed plate 46 by a manual lever 48, and the two positions of the swivel arm 47 and the fixed plate 46 are opened. If the positioning pins 49 are inserted when the holes of the locations match, the positioning can be performed properly for each measurement unit, and calibration for each measurement unit is performed based on this.

[0006]

What can be said in common with the above-mentioned conventional example and another conventional example is that firstly, the positioning or movement of the sample plate with respect to each measuring portion requires human labor, and The second problem is that since the operator works near the radiation source container, there is a risk of exposure, particularly due to erroneous operation related to radiation of the radiation source.

SUMMARY OF THE INVENTION An object of the present invention is to provide a calibration apparatus for a transmission-type radiation thickness gage which solves the above problems of the prior art and can save labor and ensure safety.

[0008]

According to a first aspect of the present invention, there is provided a calibration apparatus for a transmission-type radiation thickness gage, wherein a plurality of measurement units each including a measurement source and a corresponding detector have a common plate shape. When a transmission type radiation thickness gage is constructed by distributing and arranging it on a plane for measuring the thickness of an object, it is used as a reference for the object between the source and the detector of each measuring unit. An apparatus for sequentially inserting a sample plate and calibrating a measuring part thereof, comprising an arm having a radiation passing hollow portion extending in a longitudinal direction and being driven to rotate; and said linearly driven in a longitudinal direction on the arm. A table having a hollow portion for radiation passage for mounting a sample plate; and positioning the table on the arm and rotating the arm to position the table between the radiation source and the detector of each measurement unit. A sample plate is inserted.

According to a second aspect of the present invention, there is provided a calibration apparatus for a transmission-type radiation thickness gauge, wherein the arm comprises:
It is provided with a guide rail for guiding the table so as to be able to go straight, and a pneumatic cylinder type operation unit for driving the table straight. According to a third aspect of the present invention, there is provided a calibration apparatus for a transmission-type radiation thickness gauge according to the first or second aspect, wherein the arm is stretched between a predetermined location on the distal end side and a predetermined location above the pivot axis. The lifting wire is provided.

According to a fourth aspect of the present invention, there is provided a calibration apparatus for a transmission-type radiation thickness gauge, wherein the radiation thickness gauge is configured to be movable in the apparatus according to any one of the first to third aspects.

[0011]

In the calibration apparatus for a transmission-type radiation thickness gauge according to any one of claims 1 to 4, the sample plate mounting table is positioned on the arm, and the arm is rotationally positioned. As a result, the sample plate is sequentially inserted between the radiation source and the detector of each measurement unit, and calibration relating to the measurement unit is performed.

[0012] In particular, in the calibration apparatus for the transmission type radiation thickness meter according to the second aspect, the sample plate mounting table is guided so as to be able to move straight by the guide rail, and is driven straight by the pneumatic cylinder type operation unit. In particular, in the calibration apparatus for a transmission-type radiation thickness meter according to claim 3, the arm is prevented from hanging down by a wire stretched between a predetermined location on the distal end side of the arm and a predetermined location above the pivot axis. You.

In the calibration apparatus for a transmission type radiation thickness meter according to the present invention, since the radiation thickness meter can be moved, the calibration apparatus is used for actual measurement of a plate-like object, and the calibration apparatus is used for calibration. Each is positioned near.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a calibration device for a transmission type radiation thickness meter according to the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view when the embodiment is used. In the figure, 10 is a calibration device, and 20 is a thickness gauge to be calibrated.
The thickness gauge 20 mainly includes a U-shaped frame 23 having a moving wheel 24, and three sets of a source container 21 and a detector 22 built in respective lower and upper portions thereof. In this case, the source container
21, except that the number of sets of the detector 22 is changed from two in the conventional example to three. The calibration device 10 mainly includes a revolving unit for moving the sample plate and a rectilinear portion. The swivel unit includes a fixed base 1, a swivel arm 4 and a swivel shaft 5 swiveled around its vertical axis. The rectilinear section is composed of a table 7 on which the sample plate 15 is placed and a pneumatic cylinder type operating device (FIG.
2, see reference numeral 9 in FIG. 3). The wire 11 is stretched between the swing arm 4 and the upper part of the swing shaft 5 so that the tip does not hang down.

The thickness gauge 20 is provided on a production line during actual measurement.
Further, at the time of calibration, each is positioned near the calibration device 10, and the wheels 23 function for the movement. By the way, thickness gauge 20
In order to calibrate each of the three sets of detector 21 and source container 22,
The pivot arm 4 takes positions B, C, and D sequentially from the position A in the figure, and the base 7 takes the corresponding rectilinear position corresponding to the position between the source container 21 and the detector 22 of each set. It is positioned at the regular position. The position A is the initial position, where the sample plate 15 is placed on the table 7 and lowered.

FIG. 2 shows the calibration device 10 in more detail.
3 and a plan view of FIG.
In these figures, a turning motor is installed inside the base 1.
2 is stored, and the turning arm 4 and the turning shaft 5 are fixed to the output shaft of the motor 2. In addition, the upper surface of the base 1 and
Thrust bearing 3 between lower surface of pivot arm 4 and center
Is provided to ensure a smooth turning operation of the turning arm 4. To prevent the tip of the swing arm 4 from hanging down,
A wire 11 is stretched between the tip of the turning arm 4 and the upper end of the turning shaft 5. The tension of the wire 11 is adjusted by a turnbuckle 12 inserted in the middle. By using this wire 11, compared to when it is not
The structure of the swing arm 4 for preventing the tip from sagging is extremely simplified and lightweight.

The pivoting arm 4 has a central hollow portion 4a for passing radiation in the longitudinal direction, and a pair of guide rails 6 disposed on both sides thereof. Along this guide rail 6,
A table 7 with wheels 8 is guided so that it can go straight. A pneumatic cylinder type operating device 9 is installed on the upper surface of the revolving arm 4, and the base 7 is directly connected to the output shaft. The platform 7 has
A sample plate 15 as a reference for calibration is placed, and a circular hollow portion 7a for passing radiation is opened. By the way, in addition to the above, the calibration device 10 is provided with a position sensor and a control unit for positioning control, and a stopper and a limit switch as a protection device. Omitted.

Referring again to FIG. 1, in the thickness gauge 20, three sets of the source container 21 and the detector 22 are arranged side by side at regular intervals on a straight line. In the production line at the time of actual measurement, a strip-shaped rolled steel plate, which is an object of thickness measurement, is transported so as to cross the straight line at a right angle, and a total of a central portion and each edge on both sides is 3
The thickness at each location will be measured. Further, at the time of calibration, the relative position between the calibration device 10 and the thickness gauge 20 is determined so that the center of rotation is located in a direction perpendicular to the juxtaposed straight line through the central set of the source container 21 and the detector 22. Then,
The position of the platform 7 on the swing arm 4
4 is the first position on the side closer to the turning center when the position is C, and the second position on the side farther from the turning center when the positions B and D are taken.

Here, the operation of the calibration device 10 will be described. At first, the revolving arm 4 is at the position A, and the sample plate 15 is placed on the table 7 here. Thereafter, while the swing arm 4 swings toward the position B, the table 7 also moves straight toward the second position. The stand 7 and, consequently, the sample plate 15 are positioned at the position of the set of the source container 21 and the detector 22 on the left side, and the set is calibrated. When it is finished, swivel arm 4
While turning around toward the position C, the table 7 also moves straight toward the first position, is positioned at the central set of the source container 21 and the detector 22, and the set is calibrated. Finally, while the swing arm 4 swings toward the position D, the table 7 also moves straight toward the second position, and the source container on the right side moves.
21, the detector 22 is positioned at a set, and the set is calibrated. After all the above calibrations, the swivel arm
4 returns to the initial position A, the sample plate 15 is lowered from the table 7, and a series of calibration operations is completed. Next, the thickness gauge 20 moves to the production line and is incorporated for measuring the thickness of the rolled steel sheet.

[0020]

According to the calibration apparatus for a transmission type radiation thickness meter according to any one of claims 1 to 4, the sample plate mounting table is positioned on the arm, and the arm is rotated and positioned. As a result, a sample plate is sequentially inserted between the radiation source and the detector of each measurement unit, and calibration of the measurement unit is performed. Therefore, the labor can be saved, the accuracy can be improved, and the efficiency can be improved, and the safety can be ensured because it is not necessary to approach the radiation source.

In particular, in the calibration apparatus for the transmission type radiation thickness meter according to the second aspect, the sample plate mounting table is guided so as to be able to move straight by the guide rail, and is driven straight by the pneumatic cylinder type operation unit. In addition, the structure can be simplified, the operation reliability can be improved, and the cost can be reduced. In particular, in the calibration apparatus for a transmission-type radiation thickness meter according to claim 3, the arm is prevented from hanging down by a wire stretched between a predetermined location on the distal end side of the arm and a predetermined location above the pivot axis. Therefore, the structure can be simplified and the weight can be reduced.

In the calibration apparatus for a transmission-type radiation thickness meter according to claim 4, the radiation thickness gauge is movable, so that the calibration apparatus is used for actual measurement of a plate-shaped object and for calibration. Each is positioned near. Therefore, the preparation time for switching from the actual measurement to the calibration and from the calibration to the actual measurement can be shortened, and the actual measurement and the calibration can be easily performed.

[Brief description of the drawings]

FIG. 1 is a perspective view when an embodiment according to the present invention is used.

FIG. 2 is a side view of the embodiment.

FIG. 3 is a plan view of the embodiment.

FIG. 4 is a perspective view of one conventional example.

FIG. 5 is a perspective view of another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base 2 Motor 3 Bearing 4 Revolving arm 4a Hollow part 5 Revolving shaft 6 Guide rail 7 units 7a Hollow part 8 Wheel 9 Pneumatic cylinder type operation machine 10 Calibration device 11 Wire 15 Sample plate 20 Thickness gauge 21 Source container 22 Detector 23 frame 24 wheels

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G01B 15/00-15/08

Claims (4)

(57) [Claims] A plurality of measuring units each comprising a measuring radiation source and a corresponding detector are distributed and arranged on a plane for measuring the thickness of a common plate-like object, and the transmission type radiation is provided. An apparatus for calibrating a measuring unit by sequentially inserting a sample plate as a reference for the object between a source and a detector of each measuring unit when configuring the thickness gauge, and extending in a longitudinal direction. An arm having a radiation-passing hollow portion and being driven to rotate; and a table having a radiation-passing hollow portion for mounting the sample plate thereon, which is driven linearly in the longitudinal direction on the arm. Characterized in that the sample plate is inserted between the radiation source and the detector of each of the measuring sections by positioning on the arm and rotational positioning of the arm. Calibration equipment. 2. An apparatus according to claim 1, wherein the arm includes a guide rail for guiding the table so as to be able to move straight, and a pneumatic cylinder-type operation unit for driving the table straight. Calibration device for thickness gauge. 3. The device according to claim 1, wherein
The calibration device for a transmission-type radiation thickness meter, wherein the arm includes a lifting wire that is stretched between a predetermined location on the distal end side and a predetermined location above the pivot axis. 4. An apparatus according to claim 1, wherein the radiation thickness gauge is movable.