JPH02208546A - Inspecting device for tightly wound part of can - Google Patents

Abstract

PURPOSE:To achieve a higher safety and easier and quicker inspection by positioning a can to be inspected so that an angle necessary for measurement can be held for measurement with respect to an X-ray path connecting an X-ray source and an image receiving means. CONSTITUTION:A tightly wound part CM of a can C to be inspected is arranged horizontally between an X-ray generator 20 and an X-ray camera 30 so that X rays (a) projected from the device 20 are projected to a front part CM1 of the tightly wound part CM. Then, as X rays (a) projected from the device 20 hit the tightly wound part CM, it is transmitted through the tightly wound part CM being absorbed in proportion to material and a thickness of parts. The X rays (a) transmitted are incident into a camera 30 to be converted into an electrical signal and inputted into an image processor 50 to perform an image processing. A front viewed image of the tightly wound part CM obtained by the image processing appears as an band-shaped image having a contrast according to absorptivity at the parts. Therefore, the front viewed image is processed with a computer thereby enabling measurement of dimensions of parts of the tightly wound part CM and detection of a defective can automatically.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a can seam portion inspection device for inspecting the seam portion of a metal can used as a container for food products or the like.

[Prior Art] Metal cans used as containers for canned foods, etc. are made up of nine can bodies, a lid, and a can bottom. In the case of so-called three-piece cans, the can body has a can lid and a can bottom. M is formed by wrapping the can, and in the case of a two-piece can in which the can body and can bottom are integrated, the can lid is wrapped around the can body, thereby sealing the can. This can body and can lid (
As will be described later (Fig. 8), the winding part of the can lid (hereinafter referred to as the "can lid" including the can bottom) is connected to the podium hook (B H) formed on the edge of the can body and the can lid. It is formed by engaging and crimping the cover hook (CH) formed on the outer circumferential line of the cover hook (CH).

The quality of this seaming part has a great effect on maintaining the quality of the contents filled in the can. That is, Podehook (B
Cans with defects in the seaming part, such as because the overlapping part (OL) between H) and cover hook (CH) is not long enough, will cause problems such as spoilage of the contents due to poor sealing. For this reason, it was necessary to periodically inspect the seaming portion of the can after the first seaming process and to manage the process to prevent the occurrence of poorly seamed cans.

Conventional means for inspecting the seaming part of a can is to cut the seaming part in the axial direction using a thread saw, etc., so that the cross section inside the first seam can be visually inspected, and then visually inspect or measure the dimensions of each part. It was something to do. In addition, the areas where such inspections and measurements are performed require time and effort to cut with a scroll saw.

usually,! ! ! There were only three locations around the entire circumference of the tightening part.

[Solve it! ! [Problems] As described above, the conventional means for inspecting the seamed portion of a can by cutting the seamed portion using a scroll saw is time-consuming and has the risk of cutting fingers. Additionally, as this is a destructive test, the cans used for inspection cannot be treated as products.
This caused a decrease in yield. Furthermore, the tips of the body hook (BH) and cover hook (CH) in the seaming part often have irregular undulations at short intervals due to one seam tightening, so inspections at about three locations, zero
Conventional inspection means for determining the quality of the entire periphery of a seamed portion based on a fixed standard have a drawback of lacking reliability.

Therefore, the inventor of the present application first developed a method for inspecting the can seaming part that solves this problem in Japanese Patent Application Nos. 111564/1985 (274851/1983) and 111565 (1983).
No. 274853).

It was disclosed in No. 111566 (No. 274808). These methods of inspecting the can wrapping section involve placing the can to be inspected between an X-ray source and an This allows non-destructive inspection of the entire circumference of the tightening part.

Now, based on the invention of the above-mentioned method for inspecting the spring part, we have developed an inspection device for the can seaming part to carry out specific inspections.

That is, the present invention can automatically perform the inspection and zero-setting of each point of the seaming part sufficient to obtain reliable inspection results without destroying the can, resulting in improved safety and ease of inspection. The purpose of the present invention is to provide an inspection device for can seaming parts, which can speed up the manufacturing process and contribute to improving the yield.

[Means for Solving Problems] In order to achieve the above object, the method for inspecting a can seaming part of the present invention includes an X-ray source, an image receiving means provided opposite to the X-ray source, and a means for positioning the can to be inspected so that the can to be inspected can maintain an angle necessary for measurement with respect to the X-ray line connecting the X-ray source and the image receiving means; If necessary, the image receiving means and the positioning means for the can to be inspected may be provided as a moving part.

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

FIG. 1 is a schematic diagram illustrating the principle of inspection using a front view image of the can seam portion, and FIG. 2 is a schematic diagram showing the principle of inspection using a cross-sectional image of the can seam portion.

First, the principle of the apparatus of this embodiment will be explained with reference to these drawings.

To obtain a front view image of the seaming part, as shown in Figure 1,
The X-ray generator 20 and the X-ray camera 30 horizontally arrange the crimp part CM of the can C to be inspected, and the X-rays a projected from the X-ray generator 2120 hit the front part CJ11 of the crimp part CM. so that it is projected to In this case, the optical path of the X-ray a connecting the X-ray generator 2t20 and the X-ray camera 3o is inclined by θ from the vertical line so that the X-ray a is directly projected onto the front portion C1 of the seaming portion CM. Become.

When the X-rays a projected from the xva generator 2120 hit the seaming part CM, the material of each part? It passes through the seaming part C)1 while being absorbed in proportion to j (material density) and thickness.

The transmitted X-rays enter the X-ray camera 30, are converted into electrical signals, are input to the image processing bag fi50, and are subjected to image processing.0 A front view image of the seaming parts 1, 1 obtained by image processing As shown in FIG. 8, a band-shaped image A is formed having a contrast depending on the absorption rate of each part. Therefore, by computer processing this front view image A, the dimensions (BH) of each part of the seaming portion CM are determined.

CH, OL) measurement and defective can detection can be performed automatically, and at the same time, the front view image A is displayed on the display device t63, and a cross-sectional image of the 0-roll tightening part can be visually inspected. In order to obtain
A side edge portion CM2 of the X-ray generator 20 is placed directly below the X-ray generator 20. The X-rays a projected from the X-ray generator Fa20 are absorbed by the hatched area including the side edge CM2 of the seam-fastened part CM, and then pass through the seam-fastened part CM and enter the X-ray camera 30. do.

The cross-sectional fluoroscopic information obtained by the XMAa incident on the X-ray camera 30 is information in which cross-sectional images of the hatched portion are superimposed. The cross-sectional image B obtained in this way has inferior image quality compared to a front-view image, so it is more useful for observing the seaming state than for measuring one dimension.

Next, the configuration of the apparatus of this embodiment based on the above-mentioned principle will be explained.

Figure 3 shows the overall configuration of the device of this embodiment.
Figure a) is a front view, and figure (b) is a right side view.

In the drawing, 10 is a main body of an X-ray device, and inside is equipped with an X-ray generator 21 (Xiall) 20, an image receiving means 30, and a can transport positioning device ao (a means for positioning the object to be inspected). This is the central part of this device. Reference numeral 50 denotes an image/data processing device, which uses a known computer specially modified so that it can process seaming dimension measurements at high speed and with high precision. 60 is a control box, which includes an operation panel equipped with operation switches, 61 a keyboard 62, and a CRT display 63.
, X-ray camera controller 64, electrical control related parts 65
is included.

The X-ray apparatus main body 10 and the control box 60 are installed side by side on the upper surface of the pedestal 70, and the image fist data processing device 50 is housed in a storage space formed in the pedestal 70.

A main door 12 that opens and closes around a hinge 11 is attached to the front of the X-ray apparatus main body 10, and a sub-door that opens and closes electrically in the vertical direction is located slightly above the center of the main door 12. 13 is the provision. The main door 12 is opened manually when inspecting and servicing the equipment inside the X-ray apparatus main body IO, and is always closed.

The auxiliary door 13 is opened electrically when the subject is placed in the device 40 for determining the transport position, which will be described in detail later. therefore,
The auxiliary door 13 is provided in front of the device 4o for comfortable transportation. Note that a lead-containing glass window 14 is fitted into a part of the sub door 13, and the inside of the X-ray apparatus main body 10 can be seen through this window 14.

Inside the X-ray head main body 10, the transport position and the device i! are located in the center of the body. ! 40 is installed horizontally, and the -
An X-ray generator 20 is fixedly provided at a slight distance in the L direction. The X-ray generator 2120 has a focal point of 0.1 to 1.
A so-called fine focus X-ray tube with a diameter of 0 mm (usually 0.3 mm) is used. In addition, the X-ray camera 30 is a transport positioning device! ! 140 and is installed close to the bottom.

4 to 6 are enlarged views of the transport and positioning device 40, with FIG. 4 being a plan view, FIG. 5 being a sectional front view, and FIG. 6 being a sectional side view.

In these drawings, 401 is a support frame, and XM
It is fixedly provided within the A device main body 10. The support frame 401 has a box shape with an open top surface, and an opening 401 & (see FIG. 6) is also formed in the bottom wall.
The image receiving portion 30a of the X-ray camera 30 enters from 01a and is placed in close proximity to the object C.

Guide rails 402 are provided on both internal side surfaces of the support frame 401 in the front-rear direction (hereinafter referred to as the Y-axis direction).
A rectangular drawer frame 403 is provided with both side edges supported by these guide rails 402 . The drawer frame 403 is connected to an air cylinder 404 provided extending in the Y-axis direction on the bottom surface of the support frame 401, and is slid in the YM force direction by driving the air cylinder 404. The air cylinder 404 is controlled to start at the same time as the drive source (not shown) that opens and closes the sub door 13 described above. Therefore, the drawer frame 403 is slid forward by the air cylinder 404 at the same time as the sub door 13 is opened.
The drawer frame '403 is pulled out from the opened sub door 13.

405 is a rectangular moving frame, and both the front and rear frame portions serve as shafts 408, 407. on the other hand.

Two guide members 408 and 409 are provided on each of the front and rear edges of the drawer frame 403, and shafts 406 and 407 are slidably supported by these guide members 408 and 409. Therefore, the moving frame 405 is the fourth
It is movable f@ in the left-right direction of the figure (hereinafter referred to as the X-axis direction).

The movement range is determined by the fourth guide member 408 or 409.
Frame portions 405a on both left and right sides in the figure.

405b is regulated by contact.

Here, in order to arbitrarily adjust the movement range in a finer range, removable spacers are attached to the shafts 408 and 407, and the spacers are brought into contact with the guide members 408 and 409, thereby regulating the movement range of the movement frame 405. However, the moving frame 405 may be moved manually. In addition, there is one frame part 405 inside the moving frame 40517).
Two guide shafts 410, 4 parallel to a and 405b
11 are provided.

412 is a stand for can mounting, and guide members 41 fixed at the four corners
3,414 are engaged with the guide shafts 410 and 411. Therefore, when installing the can, the stand 412 is the guide shirt)
It is guided by 410 and 411 and is movable in the Y-axis direction. The range of movement thereof is regulated by the guide members 413, 414 coming into contact with the frame portions 405c, 405d of the moving frame 407. For example, the guide shaft 4
10. By attaching a spacer to an arbitrary position of 411 and bringing the guide members 413, 414 into contact with the spacer, the range of movement of the stand 412 can be adjusted. Incidentally, when attaching the can, the movement of the stand 412 is also performed manually.

415 is a can bottom pressing member, while 416 is a can lid supporting member, between which each test bag C is attached.
The can bottom pressing member 415 has a structure in which an elastic member such as synthetic rubber is adhered to the surface of a disk, and is formed to have a diameter slightly larger than the diameter of the bottom of each test bag C. This can bottom pressing member 415 is connected to a rotating shaft 418 that is rotatably supported by a bearing 417 (the can is mounted on a stand 417).
The can is attached via the universal joint 419 to the air cylinder 42 provided at the center of the left end of the stand 417.
Connected to 0. Then, by receiving the pressing force from the air cylinder 420, the bottom of each test bag C is pressed in the right direction in FIG. 4 (toward the can lid support member 416), and the test bag C is securely fixed. The universal joint 419 is provided so that the can bottom pressing member 415 always hits the entire bottom circumference of each test bag C.

On the other hand, the can lid support member 416 consists of three rolls 421 and 42.
1,421ixfl, and the peripheral surface of these rolls 421 rotatably supports the head (sealing portion CM) of each test bag C. As will be described later, the three rolls 421 receive It is installed in a position that does not block the railway line.Specifically, it is located at points P and Q in Figure 4 when viewed from above.
The lid of each test bag C is supported at a position where it does not touch the point. Note that such consideration is not necessary when the roll 421 is made of an X-ray transparent material.

422 is a roller that rotatably supports the four sections of the can body in each test bag C from below, and each can is attached to the stand 412. When attaching each test bag C, the configuration is such that the axis of each test bag C can be aligned with the can bottom pressing member 415 by simply storing the can body of each test bag C on these rollers 422. The position has been adjusted.

Reference numeral 423 denotes a motor for rotationally driving each test bag C, and the can attachment is carried out by a zero-rotation shaft 418 provided on the stand 412 via a rail so as to be linked to the movement of the can bottom pressing member 415.
A timing pulley 424 is attached to the timing pulley 424, and rotational driving force is transmitted from a timing pulley 425 on the motor 423 side to the timing pulley 424 via a timing belt 426 to rotate the shaft 418 for one rotation (rotation means for each bag to be tested). ), thereby, the can bottom pressing member 415 or each test bag C can be rotated.

FIG. 7 is a cross-sectional side view showing the moving mechanism of the X-ray camera 30.

The X-ray camera 30 is slidable via a support 32 on a guide rail 31 extending in the same direction as the moving frame 405 in the transport position determining device 2240 (that is, in the X-axis direction). It is set in. 33 is a motor, and a transmission mechanism 3 such as a rack and pinion or a bevel gear
4 to the support body 32 of the X-ray camera 30. This allows the X-ray camera 30 to move in the X-axis direction.

The image/data processing device 50 (FIG. 3(a)) performs image processing on the electrical signal from the X-ray camera 30, performs data processing on the processed image information, and outputs an inspection result.

The operation panel 61 in the control box 60 (FIGS. 3(a) and 3(b)) turns on and off the power to each part of the device, and the keyboard 62 controls inputs, commands, and image/data processing equipment for each part of the device. Inputs and commands to 2150 are made. The keyboard 62 can be pulled out toward the front of the device as shown in FIG. 3(b). CR
The T-display 63 displays the test results obtained by the image/data processing device 2150.

Next, the operation of the can seaming portion inspection device having the above-described configuration will be explained.

First, when a switch (not shown) for opening/closing the auxiliary door installed on the operation panel 61 shown in FIG. , 6) is activated, and the drawer frame 4
03 is projected in front of the device. As a result, when mounting the cans, the stand 412 is exposed to the outside of the apparatus, making it easy to mount each test bag C.

When installing each test bag C, the air cylinder 419 is turned off.
Then, by placing each bag to be tested C on its side on the roller 422 and then operating the air cylinder 419, a gap is created between the can bottom pressing member 415 and the roll 421. Each test bag C is pressed and fixed.

In order to obtain a front view image of the seaming part CM, as shown in FIG. C is moved, and the X-ray camera 30 is also moved to a position close to the front part CM+ of the seaming part CM. Specifically, assuming that the position indicated by PO in FIG. 4 corresponds to the position of PG in FIG. Manually move it in the Y-axis direction to match point P in FIG. 4 with PO. In addition, by operating the X-ray camera drive switch (not shown) provided on the operation panel 61,
(see figure), the field of view of the X-ray camera 30 is also made to match the PO. Adjustment of the above moving frame 405 is as follows.
By moving the frame portion 405b until it abuts the guide member 409, the can attachment can be mechanically adjusted by moving the stand 412 until the guide member 413 abuts against the frame portion 405C. Frame 403
When the is pulled out to the front of the device, ! i is also possible.

Furthermore, in order to obtain a cross-sectional image of the seaming portion CM, as shown in FIG. 2, an X-ray generator i! Sealing part CM just below t20
Each test bag C is moved so that the side edge CM2 of CM2 is located, and the X-ray camera 30 is also moved directly below the side edge CM2 of the ff&cN. Specifically, the QO in Figure 4
Assuming that the position indicated by corresponds to the position of Qo in FIG. move the
Match point Q in FIG. 4 with QO. Also.

The field of view of the X-ray camera 30 is also made to match the QO.

After positioning each test bag C as described above, when the sub-door opening/closing switch (not shown) is operated to close the sub-door 13, the drawer frame 403 is moved into the main body of the X-ray apparatus. It is accommodated within 10.

Then, the X-ray generator 0 N10 F F switch (not shown) installed on the operation panel 61 is turned ON to inspect the can seaming part. This inspection method is shown in FIGS. 1 and 2. Since this is a well-known method based on the inspection principle described above (see Japanese Patent Laid-Open Nos. 63-274851 and 274808), detailed explanation will be omitted.

The inspection can be carried out at any point on the seaming part CM. For example, the seaming part CM is divided into 300 intervals and the total
When two points are selected as inspection points, the inspection is performed by operating the motor 423 and rotating the inspection target C every 300 degrees.

Note that the present invention is not limited to the one embodiment described above, and various modifications can be made within the scope of the gist.

For example, the apparatus may be designed solely for the purpose of inspecting the can-sealing portion using a front view image. In this case, since it is sufficient to always position the inspected section C at a fixed position, a mechanism for moving the inspected section C using the stand 412 and a moving mechanism for the X-ray camera are not required for mounting the can on the moving frame 4051.

[Effects of the Invention] As explained above, according to the inspection device for the can seaming part of the present invention, it is possible to automatically inspect and measure each point of the seaming part sufficient to obtain reliable inspection results. As a result, it is possible to improve safety -■-1 to make testing easier and faster.
Furthermore, it has the effect of contributing to the accumulation of $.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the inspection principle using a front view image of the can seaming part, Fig. 2 is a schematic diagram showing the inspection principle using a cross-sectional image of the can seaming part, and Fig. 3 (a) is a diagram showing the implementation of the present invention. FIG. 3(b) is a right side view, and FIGS. 4 to 6 are views showing the transport positioning device.
The figure is a Y-plane view, Figure 5 is a cross-sectional front view, Figure 6 is a cross-sectional side view, Figure 7 is a cross-sectional side view showing the moving mechanism of the X-ray camera, and Figure 8 is a cross-sectional view and front view of the can cinching part. It is a figure showing a visual image. 10: X-ray apparatus main body 20: X-ray generator (X-ray source) 30: X-ray camera (image receiving means) 40: Transport position determining device (position determining means for inspected part) 50: Image/data processing device 423: Motor

Claims (2)

[Claims] (1) An X-ray source, an image receiving means provided opposite to the X-ray source,
means for positioning the can to be inspected so that the can to be inspected can maintain an angle necessary for measurement with respect to the X-ray line connecting the X-ray source and the image receiver, the means being located close to the image receiving means;
A device for inspecting a can seaming section, comprising: means for rotating the can to be inspected around an axis. (2) An inspection device for a can seam portion according to claim 1, wherein the image receiving means and the positioning means for the can to be inspected are movable.