JPS6253769B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a non-destructive measuring device for continuously non-destructively measuring internal defects existing within the radial thickness of a cylindrical hollow rotating body.

When molding a cylindrical hollow rotating body by casting or casting, internal defects are often observed in the thickness direction (radial direction) due to shrinkage cavities due to solidification and shrinkage, or gas entrainment. .

As a method for non-destructively inspecting such internal defects, there is a method of taking a radiograph of the object to be inspected in the thickness direction and determining the shape and size from the radiograph. However, this method of determining based on photographs has the disadvantage that individual differences occur in the determination because the determination relies on the subjectivity of the judge. In addition to this, there is also the problem that it takes a long time to take radiographs, making it difficult to quickly inspect a large number of objects to be inspected. There is also a device that uses a combination of a radiation source and a radiation detector to continuously detect defects existing inside a ring-shaped object to be inspected over the entire circumference, and records the measurement results on a recorder. In the case of a cylindrical object to be inspected, the length in the axial direction is long, so there is no way to inspect the entire circumferential surface in the axial direction continuously and in a short time. Aligning objects is also not an easy task.

The present invention has been made based on these circumstances, and enables continuous and rapid quantitative non-destructive inspection of cylindrical hollow rotating bodies without requiring a complicated configuration. The symmetrical point when looking at both ends from the center point between both ends on the center line can be easily aligned with the radiographic inspection section, thereby improving the reliability of the product and significantly reducing the number of inspection man-hours. The purpose is to provide a non-destructive measurement device that can be realized.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes an object to be inspected consisting of a cylindrical hollow rotating body, and 2 denotes a pair of front and rear drive rollers which are appropriately spaced apart from each other in the axial direction of the object to be inspected. The object 1 is supported horizontally in contact with the outer peripheral surface of the object 1 and rotated. 3 is an electric motor for rotationally driving the drive roller 2; 4 is a radiation source; 5 is a control panel for controlling the amount of radiation generated from the radiation source 4; 6 is an object to be inspected 1 emitted from the radiation source 4; 7 is a recorder that records the signal detected by the GM tube 6. 8, when installing the object 1 to be inspected on top of the drive roller 2, the center point between both ends of the object 1 to be inspected on the axial center line is located at the center position between the pair of front and rear drive rollers 2. The details of the portion related to this guide 8 are shown in FIGS. 2a and 2b. Positioning of the object to be inspected 1 in the axial direction using this guide is performed by sliding the fixture 9 of the guide 8 over the slide bar 10 with graduations, and after positioning, the fixing nut 11 attached to the fixture 9 is Fixture 9
It is now possible to fix the Further, the guide 8 can be rotated within an appropriate range with respect to the center of the fixing tool 9 [see 2b].
The axial direction of the guide 8 (the axial direction of the object to be inspected 1)
While fixing the position of the roller 2 of the object to be inspected 1,
After being used for positioning on the object 1, it can be made free so as not to contact the object 1 to be inspected during rotation.

On the other hand, the radiation source 4 and the GM tube 6 are fixed to fixed rods 12 and 13, respectively, and the radiation source 4, the measurement point 1a of the object to be inspected 1, and the detection part of the GM tube 6 are finely aligned so that they are aligned in a straight line. It is set with an adjustment screw. The fixed rods 12 and 13 have a horizontally movable rod 14 that can be adjusted to move in the axial direction of the object to be inspected 1, and a vertically movable rod that can vertically move the fixed rods 12 and 13 integrally while maintaining the distance relationship between the three. It is fixed to rod 15. Further, the radiation inspection unit fixing mechanism, which includes the radiation source 4, GM tube 6, and supporting and fixing rods 12 to 15, is installed on a cart 16 that can be moved in parallel in the axial direction of the object to be inspected 1.

Further, a pedestal 17 on which a rotation mechanism for rotating the object to be inspected 1 is mounted is installed on a rotation mechanism 18 that can rotate 180 degrees. In this case, the object to be inspected 1 is designed to horizontally rotate 180 degrees together with the mount 17 about the center point between both ends on the axis center line.

Although the object 1 to be inspected is not particularly shown, it can be inspected by another drive roller provided on the other side of the drive roller 2 in FIG. 1 and rotating in the same direction, or by a similarly provided rotatable support roller. Supported.

Next, the operation when continuously non-destructively measuring the object to be inspected 1 using the above configuration will be explained.

Guide the object 1 to be inspected on the slide bar 10 according to the length of the object 1 to be inspected so that the center point between both ends of the object 1 made of a cylindrical hollow rotating body on the axial center line is at the center of the rotation mechanism. Determine the position of 8. The object to be inspected 1 is placed on the drive roller 2 according to the guide 8 . In addition, the radiation source 4 and
The position of the trolley 16 is determined so that the position of the detection part of the GM tube 6 is at the measurement start point of the object to be inspected 1, and the position on the vertical movement rod 15 and the position on the horizontal movement rod 14 are also determined. The distance between the radiation source 4, the measurement point 1a of the object to be inspected 1, and the detection section of the GM tube 6 is determined. And guide 8
After freeing the radiation source 4 from the object 1 to be inspected
An appropriate amount of radiation is emitted from the control panel 5.
Then, the amount of radiation passing through the measurement position can be calculated by
It can be detected with the GM tube 6 and recorded on the recorder 7.

When the object to be inspected 1 is rotated by the drive roller 2 in this state, detection signals can be continuously recorded along the rotational direction of the object to be inspected 1 and according to the size of the internal defect.

Here, by moving the trolley 16 along the axial direction at a constant speed while further rotating the object 1 to be inspected, continuous non-destructive measurement of the object 1 to be inspected in the circumferential direction and the axial direction can be performed.

In this way, when the non-destructive measurement from one end is completed, the cart 16 is moved away from the pedestal 17 and the drive roller 2
The rotation of the frame 17 is stopped, and the pedestal 17 is rotated by 180 degrees using the rotation mechanism. Then, by setting the position of the cart 16 at the initial measurement start point, the positional distances of the radiation source 4, the measurement point 1a of the object to be inspected 1, and the detection section of the GM tube 6 are set at one end of the object to be inspected 1. The state is the same as the position, and non-destructive measurement at the other end of the object to be inspected 1 can be performed using the same procedure as described above.

Further, when inspecting objects 1 having the same size and shape successively, the inspection can be carried out in the same manner by placing the inspected objects 1 on the drive roller 2 following the guide 8. In this case, there is no need for individual alignment.

As described above, in this embodiment, the following effects can be obtained by adopting the above-described configuration.

(a) The object to be inspected 1, which is a cylindrical hollow rotating body, can be continuously and rapidly non-destructively measured in the circumferential direction and the axial direction, and the obtained detection data can be captured numerically. Therefore, it is possible to easily determine whether the object to be inspected 1 is good or bad, and it is possible to incorporate the inspection process into the production line, which greatly contributes to improving reliability.

(b) Since the object to be inspected 1 is supported on the drive roller 2 of the support drive device and rotated at a constant speed, the object to be inspected 1 can be inspected continuously, and the configuration of the device is also It can be extremely simplified.

(c) A guide mechanism that can be set according to the axial length of the object to be inspected 1 is provided on the axis of the drive roller 2, and the center point between both ends on the axis center line of the object to be inspected is located between the pair of front and rear drive rollers. Since it can be set to the center position between 2,
It is possible to easily align the part to be inspected.

(d) The mount 17 on which the support drive device is mounted is equipped with a turning mechanism that can rotate the object 1 to be inspected 180 degrees around the center point between both ends on the axis center line, so that the center of the object 1 to be inspected is When measuring a symmetrical location on both end sides when viewed from a point, the symmetrical inspection location can be easily aligned with the radiographic inspection section.

(e) Since the radiographic inspection unit fixing mechanism is mounted on the trolley 16 that can be moved in parallel in the axial direction of the inspected object 1, it can be easily moved without moving the inspected object 1 when moving the inspected area. The position to be measured can be positioned in the same way, and the symmetrical side thereof can also be positioned in the same manner by means of the above-mentioned mount 17.

As described above, according to the present invention, there is provided a drive roller that horizontally supports an object to be inspected made of a cylindrical hollow rotating body in contact with its outer peripheral surface and rotates the object to be inspected, and a drive roller that rotates the drive roller. a support drive device equipped with an electric motor for driving the support drive device; a mount mounting the support drive device and equipped with a turning mechanism capable of turning the object to be inspected by 180 degrees around a center point on its axis center line; A radiation source and a radiation detector are arranged opposite to each other on the hollow side and the outer peripheral side of the object to be inspected supported by the support drive device, and the radiation source and the radiation detector are arranged opposite to each other on the hollow side and the outer circumferential side of the object to be inspected supported by the support drive device. These radiation sources,
A radiographic examination unit fixing unit equipped with a fixing rod that fixes the object to be inspected and a radiation detector so that they can be finely adjusted so that they are aligned in a straight line, and a vertically movable rod that supports the fixing rod so that it can move integrally vertically. Since it is composed of a mechanism and a device for recording or displaying the output of the radiation detector, continuous and rapid quantitative non-destructive inspection of a cylindrical hollow rotating body is possible without the need for a complicated configuration. The symmetrical point when looking at both ends from the center point between both ends on the axial center line of the hollow rotating body can be easily aligned with the radiographic inspection section, which improves the reliability of the product and improves inspection. It is possible to provide a nondestructive measurement device that can significantly reduce the number of man-hours.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the configuration of an embodiment of the present invention, and FIGS. 2a and 2b are detailed views of essential parts of the same embodiment. 1...Object to be inspected, 2...Drive roller, 3...
Electric motor, 4... Radiation source, 5... Control panel, 6...
GM tube, 7...Recorder, 8...Guide, 9...Fixing tool, 10...Slide bar, 11...Fixing nut, 12, 13...Fixing rod, 14...Horizontal moving rod, 15... ...Vertical movement rod, 16...
Dolly, 17... mount, 18... turning mechanism.

Claims (1)

[Claims] 1. A support drive device comprising a drive roller that horizontally supports the outer peripheral surface of an object to be inspected, which is made of a cylindrical hollow rotating body, and rotates the object to be inspected, and an electric motor for rotationally driving the drive roller. a pedestal mounted with this support drive device and equipped with a turning mechanism that horizontally rotates the object to be inspected by 180 degrees around a center point between both ends on the axis center line; A radiation source and a radiation detector are arranged opposite to each other on the hollow side and the outer peripheral side of the object to be inspected, and these radiation sources, the object to be inspected, a radiation examination section fixing mechanism comprising a fixing rod that fixes each of the three radiation detectors in a finely adjustable manner so that they are aligned in a straight line; and a vertically movable rod that supports the fixing rod integrally so as to be vertically movable; A nondestructive measuring device consisting of a device that records or displays the output of a radiation detector.