JPH0711417B2 - Inspection device for canned part - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a can winding portion inspection device for inspecting a winding portion of a metal can used as a canning container for food or the like.

[Prior Art] A metal can used as a canned container for foods and the like is formed of a can body, a can lid, and a can bottom. In the case of a so-called three-piece can, the can body is provided with a can lid and a can bottom. It is configured by winding, and in the case of a two-piece can in which the can body and the can bottom are integrated, it is configured by winding the can lid around the can body.
In this way, canned food is sealed. As described later (FIG. 8), the body-clamped portion of the can body and the can lid (hereinafter, appropriately referred to as “can lid”) includes a body hook (see FIG. 8) formed on the edge of the can body. BH) and a cover hook (CH) formed on the outer circumference of the can lid are engaged with each other and pressure-bonded.

The quality of the winding portion has a great influence on the quality retention of the contents filled in the can. That is, the body hook (B
H) and cover hook (CH) overlapped part (OL) does not have a sufficient length, etc.
It causes problems such as spoilage of contents due to poor sealing. For this reason, it is necessary to regularly inspect the winding-fastening portion of the can after completing the winding-fastening process, and to manage the process so that a defectively-fastened can does not occur.

Conventional means for inspecting the canned part is to cut the wound part in the axial direction using a thread saw, etc., so that the cross section inside the canned part can be viewed, and a visual inspection or measurement of the dimensions of each part is performed. It was something to do. Further, since the inspection and measurement are performed at a number of places on the entire circumference of the winding fastening portion, it is usually necessary to perform the cutting work with a thread saw.

[Problems to be Solved] As described above, the conventional means for inspecting a can winding portion, which is performed by cutting the winding portion with a thread saw, requires a lot of labor and has a risk of cutting fingers. Further, the cans used for the inspection due to the destructive test cannot be handled as products, which causes a decrease in yield. Furthermore, the tips of the body hook (BH) and cover hook (CH) in the tightening part often have irregular undulations in a short period due to the tightening, and therefore, for inspection and measurement at about three locations. Conventionally, the conventional inspection means for determining the quality of the entire circumference of the winding tightening portion has a drawback of lacking reliability.

Therefore, the inventor of the present application previously proposed a method for inspecting a can-wound portion, which solves such a problem, in Japanese Patent Application No. 62-111564.
63-274851), 111111 (274853), 111566
(No. 274808). These can winding parts are inspected by arranging a can to be inspected between an X-ray source and an X-ray camera to obtain X-ray fluoroscopic information, and image-processing the X-ray fluoroscopic information. This is a non-destructive inspection of the entire circumference of the fastening part.

Then, based on the invention of the method for inspecting a can winding portion, a device for inspecting a can winding portion for performing a specific inspection has been developed.

That is, according to the present invention, it is possible to automatically inspect and measure each point of the winding fastening portion sufficient to obtain a reliable inspection result without breaking the can, and as a result, improve the safety and facilitate the inspection. The object of the present invention is to provide an inspection device for a can winding portion that can be speeded up and can contribute to an improvement in yield.

[Means for Solving the Problems] In order to achieve the above object, the method for inspecting a canned portion of the present invention is provided with an X-ray source 20, an image receiving means 30 provided facing the X-ray source 20, and At a position close to the image receiving means 30,
A means 40 for positioning the can to be inspected so that the can to be inspected can hold an angle necessary for measurement with respect to the X-ray line connecting the X-ray source 20 and the image receiving means 30, and a means 40 for positioning the can to be inspected.
Is a can bottom pressing member 415 that abuts the bottom of the inspected can.
A pressing means 420 for rotatably supporting the can bottom pressing member 415 and applying a force for pressing the can bottom pressing member 415 to the bottom of the inspected can, and pressing the bottom of the inspected can. A means 423 for applying a rotational force to the can bottom pressing member 415 to rotate the can to be inspected around an axis, and a head of the can to be inspected which is arranged so as to face the can bottom pressing member 415. And a can lid supporting member 421 which is supported by.

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

FIG. 1 is a schematic view showing the inspection principle of a front view image of a can winding portion, and FIG. 2 is a schematic view showing an inspection principle of a cross sectional image of a can winding portion.

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

To obtain a front view image of the tightening portion, as shown in FIG.
The seaming portion C _M of the test cans C arranged horizontally between the X-ray generator 20 and the X-ray camera 30, the front portion of the X-ray a projected from the X-ray generator 20 is seam portion C _M C _M1 to be projected. In this case, the X connecting the X-ray generator 20 and the X-ray camera 30
By inclining the optical path of the line a by θ with respect to the vertical line, the X-ray source a is directly projected onto the front portion C _M1 of the tightening portion C _M.

When X-rays a projected from the X-ray generation unit 20 corresponds to seaming portion C _M, while being absorbed in proportion to the material (material density) and thickness of each part, passes through the seaming portion C _M. The transmitted X-ray enters the X-ray camera 30, is converted into an electric signal, is input to the image processing device 50, and is subjected to image processing. Front visual image of the seaming portion C _M obtained by the image processing, as shown in FIG. 8, it appears as an image A of the strip having a contrast according to the absorption rate of each portion. Accordingly, various dimensions of the seaming portion C _M by computing the front view image A (BH, CH, OL) can automatically perform measurements and defect can detect, also at the same time the front view image A Is displayed on the display device 63, and visual inspection can be performed. To obtain a sectional image of the seaming portion, as shown in FIG. 2, seaming portion C _M
The side edge portion C _M2 of the X-ray generator is placed directly below the X-ray generator 20. X
X-ray a projected from the line generator 20, while being absorbed by the portion indicated by hatching that includes a side edge portion C _M2 of the seaming portion C _M, the X-ray camera 30 is transmitted through the seaming portion C _M Incident on.

The sectional perspective information by the X-ray a incident on the X-ray camera 30 is
The cross-sectional image of the portion indicated by hatching is the information that is superimposed. The cross-sectional image B obtained in this way is inferior in image quality to the front view image, and is therefore more useful for observation of the tightened state than for dimension measurement.

Next, the configuration of the apparatus of this embodiment based on the above principle will be described.

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

In the drawing, reference numeral 10 is an X-ray device main body, which is internally provided with an X-ray generator (X-ray source) 20, an X-ray camera (image receiving means) 30, and a can transfer positioning device 40 (positioning device for an inspected can). It is the central part of this device. Reference numeral 50 is an image / data processing device, which uses a known computer that has been specially modified so as to be able to process the tightening dimension measurement at high speed and with high accuracy. A control box 60 includes an operation panel equipped with operation switches, a keyboard 62, a CRT display 63, an X-ray camera controller 64, and electrical control-related parts 65.

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

A main door 12 that opens and closes around a hinge 11 is attached to the front of the X-ray apparatus body 10, and a sub door that opens and closes electrically in the vertical direction is located at a position slightly above the center of the main door 12. 13 is provided. The main door 12 is manually opened when inspecting and servicing each device in the X-ray device body 10.
The main door 12 is always closed. The sub-door 13 is opened electrically when the can to be inspected is mounted on the transport positioning device 40 described in detail later. Therefore, the sub door 13 is provided in front of the transport positioning device 40. A glass window 14 containing lead is fitted in a part of the sub door 13 so that the inside of the X-ray apparatus main body 10 can be observed through the window 14.

The inside of the X-ray device main body 10 has a transfer positioning device at substantially the center.
40 is installed horizontally, and the X-ray generator 20 is fixedly provided above the device 40 with a slight distance therebetween. The X-ray generator 20 uses a so-called fine focus X-ray tube having a focus of 0.1 to 1.0 mmφ (normally 0.3 mmφ). Also,
The X-ray camera 30 is installed close to the bottom of the transport positioning device 40.

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

In these drawings, 401 is a support frame, which is fixedly provided in the X-ray apparatus main body 10. Support frame 401
Has a box-like shape with an open top and an opening 40 on the bottom wall.
1a (see FIG. 6) is formed, and the image receiving portion 30a of the X-ray camera 30 enters through the opening 401a and is arranged in the vicinity of the inspected can C.

Guide races 402 are provided on both inner side surfaces of the support frame 401 in the front-rear direction (hereinafter referred to as the X-ray direction), and a rectangular drawer frame 403 with both side edges supported by these guide rails 402. Is provided. This drawer frame 403
Is connected to an air cylinder 404 provided on the bottom surface of the support frame 401 so as to extend in the Y-axis direction.
Is driven to slide in the Y-axis direction. Air cylinder 404
Are controlled so as to start at the same time as the drive source (not shown) for opening and closing the sub door 13 described above. Therefore, at the same time when the sub door 13 is opened, the drawer frame 4 is opened by the air cylinder 404.
03 slides in the front direction, and the drawer frame 403 is pulled out from the opened sub door 13.

405 is a rectangular moving frame, and the front and rear frame parts are the shaft 4
It is 06,407. On the other hand, two guide members 408 and 409 are provided on 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 can move in the left-right direction in FIG. 4 (hereinafter referred to as the x-axis direction). The range of movement is the guide member 408 or 409.
The frame portions 405a and 405b on both the left and right sides in FIG. Here, in order to arbitrarily adjust the moving range in a finer range, a removable spacer may be attached to the shafts 406 and 407, and the moving range of the moving frame 405 may be restricted by abutting the spacers on the guide members 408 and 409. . The moving frame 405 is moved manually. Further, inside the moving frame 405, both frame parts 405a, 40a
Japanese guide shafts 410 and 411 are provided in parallel with 5b.

412 is a can mounting base, and guide members 413 and 414 fixed to the four corners.
Are engaged with the guide shafts 410 and 411. Therefore, the can mount 412 is guided by the guide shafts 410 and 411 and is movable in the Y-axis direction. The moving range is restricted by the guide members 413, 414 contacting the frame portions 405c, 405d of the moving frame 407. Further, for example, it is possible to adjust the moving range of the can mounting base 412 by attaching a spacer at an arbitrary position of the guide shafts 410 and 411 and bringing the guide members 413 and 414 into contact with the spacer. The can mount 412 is also moved manually.

415 is a can bottom pressing member, while 416 is a can lid supporting member,
The inspected can C is attached between these members. The can bottom pressing member 415 has a structure in which an elastic member such as synthetic rubber is attached to the disk surface, and has a diameter slightly larger than the bottom diameter of the can C to be inspected. The can bottom pressing member 415 is a bearing 417 (provided on the can mount 417).
It is frozen in the air cylinder 420 provided at the center of the left end of the can mounting base 417 via the rotating shaft 418 rotatably supported by and the universal joint 419. And
Upon receiving a pressing force from the air cylinder 420, the bottom of the inspected can C is pressed to the right in FIG. 4 (toward the can lid support member 416) to securely fix the inspected can C. The universal joint 419 is provided so that the can bottom pressing member 415 always contacts the entire circumference of the bottom of the inspected can C.

On the other hand, can lid support member 416 is provided with three rolls 421,421,421, rotatably supporting the inspection can C head (seam portion C _M) by the peripheral surface of the rolls 421. Three rolls 42
1, in a state of being positioned to be inspected can C to perform the inspection of the seaming portion C _M as described later, X-rays generator
It is provided at a position that does not block the X-ray line projected onto the seaming portion C _M 20. Specifically, the lid of the inspected can C is supported at a position where it does not contact the points P and Q in FIG. 4 when viewed from above. When the roll 421 is made of an X-ray transparent material, such consideration is not necessary.

Reference numerals 422 denote rollers that rotatably support four positions of the can body of the can C to be inspected from below and are provided on the can mount 412, respectively. When mounting the inspected can C, the installation position is adjusted so that the inspected can C can be axially aligned with the can bottom pressing member 415 simply by placing the can body of the inspected can C on these rollers 422. Has been done.

Reference numeral 423 denotes a motor for rotationally driving the inspected can C, which is provided on the can mounting base 412 via a rail so as to interlock with the movement of the can bottom pressing member 415. A timing pulley 424 is attached to the rotating shaft 418, and the rotational driving force is transmitted from the timing pulley 425 on the motor 423 side to the timing pulley 427 via the timing belt 426, so that the rotating shaft 418
Rotate (rotating means for inspected can). As a result, the can bottom pressing member 415 or the inspected can C can be rotated.

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

The X-ray camera 30 is slidably provided via a support body 32 on a guide rail 31 extending in the same direction as the moving frame 405 of the transport positioning device 40 (that is, the X-axis direction). Has been. A motor 33 transmits a sliding force to the support 32 of the X-ray camera 30 via a transmission mechanism 34 such as a rack and pinion or a bevel gear. This allows the X-ray camera 30 to move in the X-ray direction.

The image / data processing device 50 (FIG. 3 (a)) performs image processing on the electric signal from the X-ray camera 30, and also 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)) is used to turn on / off the power of each part of the device, and the keyboard 62 is used to input, command and display images of each part of the device.
Input and command to the data processing device 50 are performed. In addition,
The keyboard 62 can be pulled out toward the front of the device as shown in FIG. 3 (b). CRT display 63 is an image
The inspection result obtained by the data processing device 50 is displayed.

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

First, when a switch (not shown) for opening and closing the sub door mounted on the operation panel 61 shown in FIG. 3 (a) is turned on, the sub door 13 is electrically opened, and at the same time, the air cylinder is opened.
404 (see FIGS. 5 and 6) is actuated, and the draw-out frame 403 is drawn out to the front of the device. As a result, the can mounting base 412 is exposed to the outside of the device, so that the inspected can C can be easily mounted.

Before mounting the can C to be inspected, the air cylinder 420 is turned off. Then, with the inspected can C lying down,
The inspected can C is pressed and fixed between the can bottom pressing member 415 and the roll 421 by placing it on the roller 422 and then operating the air cylinder 420.

To obtain a front view image of seaming portion C _M is, as shown in Figure 1, seam portions from the X-ray generator 20 with a constant slope θ
A position X-rays is projected C _M, moves the object to be inspected can C, X-ray camera 30 is also moved to a position close to the front section C _M1 of the seaming portion C _M. Specifically, assuming that the position P ₀ in FIG. 4 corresponds to the position P ₀ in FIG. 1, the moving frame 405 is manually moved in the X-axis direction, and the can mount 412 is moved. Similarly, it is manually moved in the Y-axis direction to match point P in FIG. 4 with P ₀ . Also, the operation panel
X-ray camera drive switch (not shown) equipped on the 61
Is operated to operate the motor 33 (see FIG. 7) so that the field of view of the X-ray camera 30 also matches P ₀ . The movement frame 405 is adjusted by moving the frame portion 405b until it abuts the guide member 409, and the can mount 412 is adjusted by moving the guide member 413 until it abuts the frame portion 405C. Drawer frame 40 for mechanical access
It is possible even when 3 is pulled out to the front of the device.

In order to obtain cross-sectional images of the seaming portion C _M is, as shown in FIG. 2, the side edge portions of the seaming portion C _M beneath the X-ray generator 20 C _M2
Move the inspected can C so that
The line camera 30 is also moved right below the side edge portion C _M2 of the tightening portion C _M. Specifically, when the position indicated by Q ₀ of FIG. 4 it is assumed that corresponding to the position of Q ₀ in the second view, moving frame 405a is is moved until it abuts against the guide member 408, guide member 414 The can mounting portion 415 is moved until it comes into contact with the frame portion 405d, and the point Q in FIG. 4 is made to coincide with Q ₀ . The field of view of the X-ray camera 30 is also matched with Q ₀ .

After positioning the canister C to be inspected as described above, when the sub-door opening / closing switch (not shown) is operated to close the sub-door 13, the drawer frame 403 interlocks with the sub-door 13 and the X-ray apparatus main body 10 is operated.
Housed inside.

Then, turn on the X-ray generator equipped on the operation panel 61.
A switch for / OFF (each shown in the figure is turned on to inspect the canned portion. This inspection method is a known method based on the inspection principle described in FIGS. 1 and 2 (Japanese Patent Laid-Open No. 63-2748).
No. 51, No. 274808), so detailed description is omitted.

The inspection can be performed at any point on the tightening portion C _M. For example, when the inspection points delimiting a total of 12 points the seaming portion C _M to 30 ° interval, the inspection by operating the motor 423 can C
Rotate every 30 ° and inspect.

The present invention is not limited to the above-mentioned embodiment, and various modifications can be made within the scope of the invention.

For example, the device may be used only for the inspection by the front view image of the canned portion. In this case, since the inspected can C is always positioned at a fixed position, the moving frame 405 and the can mounting base 412 do not require the moving mechanism of the inspected can C and the moving mechanism of the X-ray camera.

[Effects of the Invention] As described above, according to the inspection device for a can fastening portion of the present invention, it is possible to automatically perform the inspection and measurement of each point of the fastening portion sufficient to obtain a reliable inspection result. As a result, there is an effect that the safety can be improved, the inspection can be facilitated and the speed can be increased, and the yield can be improved.

[Brief description of drawings]

FIG. 1 is a schematic view showing the inspection principle of a front view image of a can winding portion, FIG. 2 is a schematic view showing an inspection principle of a cross sectional image of a can winding portion, and FIG. 3 (a) is an embodiment of the present invention. A front view showing the overall configuration of the apparatus according to an example, FIG. 3 (b) is a right side view of the same, FIGS. 4 to 6 are views showing a conveyance positioning apparatus, FIG. 4 is a plan view, and FIG. Is a sectional front view, FIG. 6 is a sectional side view, FIG. 7 is a sectional side view showing a moving mechanism of an X-ray camera,
FIG. 8 is a view showing a cross section and a front view image of a can winding portion. 10: X-ray device main body 20: X-ray generator (X-ray source) 30: X-ray camera (image receiving means) 40: Conveyor positioning device (positioning device for inspected can) 50: Image / data processing device 423: Motor

Claims (1)

[Claims] 1. An X-ray source 20, an image receiving means 30 provided to face the X-ray source 20, and a position close to the image receiving means 30.
Means for positioning the inspected can so that the inspected can can hold an angle required for measurement with respect to the X-ray line connecting the image receiving means 30 and the image receiving means 30, A can bottom pressing member 415 that abuts the bottom, a pressing means 420 that rotatably supports the can bottom pressing member 415, and that applies a force for pressing the can bottom pressing member 415 to the bottom of the can to be inspected, The can bottom pressing member 415 pressing the bottom of the inspected can.
Means 423 for applying a rotational force to the inspected can and rotating the inspected can about an axis, and a can lid supporting member that is arranged so as to face the can bottom pressing member 415 and rotatably supports the head of the inspected can. 42
Inspection device for canned part, characterized by being composed of 1 and.