JPS63115051A - Defect inspecting device for can flange part - Google Patents

Abstract

PURPOSE:To improve the accuracy of inspection and to perform fast on-line inspection by deciding whether or not a flange part has a defect based on the signal of a rotary probe unit which rotates along the flange part of a can. CONSTITUTION:The rotary probe unit 39 moves synchronously in opposition to the flange part of the can 15 which revolves while being held by a can revolving mechanism, and also revolves along the flange part, so that the unit 39 inspects the defect of the flange part of the can 15. Then the output signal of the unit 39 is inputted to a self-diagnostic circuit 65 through an head amplifier 48, a time-division multiplex circuit 60, a defect signal sampling circuit 63, etc. A circuit 65 monitors respective output signal voltages and outputs a warning signal to a decision circuit 66 when an abnormal voltage is generated. The circuit 66 outputs an indication signal to a sequencer which is not shown in a figure when the voltage of a defect signal outputted by the circuit 64 exceeds a prescribed value to discharge the defective can, and then fast on-line inspection is enabled; and the unit 39 can be adjusted in detection sensitivity individually, so the inspection accuracy is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a can 7-lung defect inspection device that continuously inspects the flange portion of a can for defects.

``Prior Art'' In the field of beverage cans, there has been a shift from conventional steel IJ + piece cans to aluminum split two-piece cans. This is particularly true of the excellent ratio characteristics of aluminum in the food field, its performance as a container such as better sealing performance compared to iron three-piece cans, and the ability of DI to make can walls extremely thin.
It is based on the advantage that material costs can be significantly reduced by the (]) raw and ■roning) processing method. Furthermore, with the recently developed hole liquid nitrogen filling method, two-piece cans are expanding into areas other than beer and carbonated beverages, where three-piece cans have been used exclusively up until now.

In this way, one of the biggest technical problems in the field of two-piece cans, which is growing into a major industrial field, is the processing and handling of cans when wrapping the can lid around the flange of the can to enclose the contents. There is a problem in that the contents leak due to defects in the can flange that sometimes occur. This defect in the can flange portion will be briefly explained based on FIGS. 15 to 21.

FIG. 15 shows a part of the cross section of the flange portion of one can, where 1 is the flange portion and 2 is the neck portion.

Examples of defects when a part of the seven flange portions 1 are viewed from above are shown in FIGS. 16 to 21.

a) Flange cracking (see reference numeral 3 in Figure 16) The tip of the flange has already cracked, and when the can lid is tightened, the cracking progresses and causes leakage of the contents.

b) Scratch (see reference numeral 4 in Figure 17) This is a scratch on the surface of the flange from the tip of the 7 flange, which is likely to occur when the can is handled. 7 if the deep words are big
Causes lunge cracking.

C) Difference in step (see reference numeral 5 in Fig. 18) This is a kind of defect in the difference in cut that occurs when trimming the opening before forming the flange of a can, and tends to cause 7-lung cracking during seaming.

d) Chips (see number 6 in Figure 19) Part of the flange is chipped from the tip, which tends to cause leakage during seaming.Furthermore, the flange is also prone to cracking.

e) L (see number 7 in Figure 20) This is a defect that occurs during the necking process to reduce the diameter of the opening of the can before the 7-lung process, and remains as it is during the 7-lung process. cause.

f) Included inclusions (see number 8 in Figure 21) If there are large non-metallic inclusions or intermetallic compounds that are generated during material manufacturing that cannot be visually identified, but are present at the tip of the 7 flange, the 7 lange should not be tightened when tightening. There is a possibility of cracking.

g) Other vertical scratches on the flange during DI processing that does not accommodate IE, adhesion of filamentous chips generated during trimming to the tip of the 7 flange, dents on the flange that occur during handling, and cracks on the flange tip. There are warps, etc., and both types are prone to flange cracking during seaming.

Conventional methods for detecting defects that lead to leakage in the flange as described above include applying pressure inside an empty can and observing the decrease in pressure due to leakage from the defective part, and a method using light (light tester). etc. have been used. However, when detecting defects in the flange part, all these methods have common specific drawbacks.
This will be explained using a light tester, which is widely used for online high-speed testing, as an example. FIG. 22 is a diagram showing the principle of the light tester. In this light tester, the flange part 1 is pressed against the seal rubber 9, and light is irradiated from the outside of the can body lO with the lamp 11. A photomultiplier tube 12 is installed in the photomultiplier. and,
If there is a leakage defect in the can body 10, there will be a leakage of light, which can be captured by the photoelectron amplifier tube 12 to identify defective cans.

This method works very sensitively in detecting pinholes in the can body and can bottom, but when it comes to defects in the 7-lunge 1, the pinhole itself is pressed against the seal rubber 9 and is blocked. Therefore, as shown in FIG. 16, only extremely large flange cracks 3 can be detected, and other relatively small defects such as leakage during seaming cannot be detected.

By the way, the frequency of occurrence of leakage defects in the can body, excluding defects in the 7-flange section, is extremely small due to advances in can material manufacturing technology and DI processing methods, and in addition, the detection performance of light testers has improved. There have been no incidents of this type of leakage.

On the other hand, regarding the defect in the 7-lunge part, a) 7-lunge processing itself is a process that easily causes 7-lunge cracking, and in order to reduce the cost of containers, the thickness of the can wall should be made thinner and the material used should be reduced. The increased toughness increases the tendency for such defects to occur.

The flange part is easily deformed by contact with other objects when transporting or handling empty cans, and is prone to defects.

c) Conventional detectors have incomplete detection performance due to the reasons mentioned above.

For these reasons, this has become one of the major problems in the manufacturing technology of two-piece cans. Moreover, the user's quality standards for leakage defects are strict, with the frequency of occurrence being 1 ppm or less.

Therefore, it has been proposed to inspect the can flange using a tester that applies eddy current damage (Japanese Patent Laid-Open No. 54-124
No. 781, JP-A-55-482, JP-A-57
(Refer to Publication No.-1034). The principle feature common to these devices is that, as shown in FIG. 23 and FIG. At this time, the can 15 is rotated in a certain direction, and when the can 15 reaches the installation position # of the flaw detection probe 16, which is no longer fixed, the can 15 stops its revolution, and the can 15 is rotated in a certain direction, and the above-mentioned flaw detection probe 16, the 7 langes a15a of the can 15 are inspected. In this case, in order to detect defects in the flange portion 15a, the flaw detection probe 16 installed near the 7-rank portion 15a detects at least one of the 7-rank flange portions 15a.
It is necessary to rotate the can 15 until the can 15 has scanned more than the circumference, and during this period, the revolution movement of the can 15 must be temporarily stopped, resulting in an intermittent revolution movement. 9 list This inspection of the flaw detection probe 16 determined that it was defective, and the ratio of 9 ratio was 15.
The food cans are discharged in the I direction, and the food cans are conveyed to the next process through the discharge chute 17.

In the above-mentioned conventional inspection device, the accuracy and stability of defect detection are determined by the distance d between the flaw detection probe 16 and the rank 7 portion i5a of the can 15, and the relative position in the vertical and horizontal directions. Depends on the relationship. That is, in order to obtain highly accurate and stable defect pressure detection performance, it is necessary that the above relative positional relationship be at an optimal position and not fluctuate as much as possible.

"Problems to be Solved by the Invention" However, the above-described conventional cans that rotate on their own axis have the following problems.

1) A slight distortion or dimensional variation of the can itself causes the flange portion of the can to wobble during rotation, and the relative position with the flaw detection probe 16 tends to fluctuate, reducing inspection accuracy.

2) Inspection accuracy deteriorates as compared to fluctuations in the relative position of the flaw detection probe and the flange due to the fluctuation of the rotational movement of the can itself.

3) When the can is driven to rotate, the can body is easily damaged by dents, scratches, etc. because the spinner or belt is brought into contact with the thinnest can body.

4) When a defect is detected, the revolution of the can must be stopped, resulting in intermittent revolution, which limits the inspection speed, making it impossible to perform high-speed online inspection with a single machine.

Therefore, when performing online inspection of a high-speed can making line using this type of inspection machine, it is necessary to install a number of inspection machines in parallel, which requires a huge amount of equipment cost and installation area.

The present invention has been made in view of the above circumstances, and its purpose is to be able to perform high-speed online inspection, improve inspection accuracy, and
It is an object of the present invention to provide a defect inspection device for a can flange portion which can prevent damage to a can to be inspected and which does not require an increase in equipment cost or installation area.

"Determined Means for Solving Problems" In order to achieve the above-mentioned objectives, the present invention provides a can revolution mechanism that holds and rotates a large number of cans that are sequentially conveyed, and a can revolution mechanism that holds and rotates a large number of cans that are sequentially conveyed. a rotary probe unit that is provided opposite to a constant magnification 7-rank part, moves in synchronization with the 7-rank part, and rotates along the flange part to inspect the flange part; and this rotary probe unit. The apparatus is equipped with a determination circuit that determines whether or not there is a defect in the 7-rank portion based on a signal from the flange portion, and a mechanism that removes the round can when it is determined that there is a defect in the flange portion.

"Function" In the can 7-lung defect inspection device of the present invention, the rotating probe unit synchronously loads the flange portion of the can, which is held by the can revolution mechanism and is moving in revolution. , by rotating along the above 7 lunges,
The rotating probe unit inspects the flange portion of the can for defects, and based on this inspection signal, the discrimination circuit determines whether or not there is a defect in the flanging, and if it is determined that there is a defect in the flange portion, the can is removed. .

"Example" Hereinafter, the present invention will be described in detail based on FIGS. 1 to 14.

1 and 2 show an embodiment of the can flange defect inspection apparatus of the present invention, with FIG. 1 being a side view and FIG. 2 being a front view. Reference numeral 20 in the figure is a motor installed on a base 21 for driving the next main shaft. A bung pulley 25 is connected to the reducer 24, and a main shaft 26 is also connected to the reducer 24. The reducer 24 also includes a main shaft 2.
A bevel gear 27 for manual rotation is attached at 6. Roughly, at the fc position in contact with the reducer 24,
An air brake 29 supported by the support column 28 is installed, and the rotating body including the main shaft 26 can be brought to an emergency stop by this air brake 29.

A disk 30 made of a light alloy plate for holding the can bottom, a star wheel 31 for holding the can body, and a disk 32 made of a light alloy plate for holding a rotary probe unit are fixed to the main shaft 26, respectively. On the outer periphery of the disk 30 for holding the can bottom, a plurality of (12 in this embodiment) can bottom holding stands 33 are attached at equal intervals so as to be able to appear and retract from the star wheel 31 side. The can bottom holding stand 33a1 is designed to suction and hold the can bottom. As shown in FIGS. 6 and 7, each can bottom holding stand 33 is fixed to the base end of its support shaft 33a and has an mL-shaped attachment member 331) and one end of the dirt attachment member 331). The nine cams 7 or 33c are rotatably attached to the support shaft 33a, and the mounting member 3 is rotatably attached to the support shaft 33a.
a spring 33d that biases the spring 3b to the left; and a guide member 33f that is fixed to the disk 30 and has a U-shaped groove 33θ.
and is rotatably attached to the other end of the mounting member 33m, and is fitted into the groove 338 of the hemlock 41 member 33f.
This cam 7 roller 33c is disposed facing the disk 30 and is emitted from the rotating roller 33g.
By contacting a nine-arc-shaped cam 35 attached to the can bottom holder 33, the can bottom holder 33 projects toward the star wheel 31 side against the spring 33d.

'Also, the star wheel 31 is attached to the can bottom holding base 3.
12 can body holding parts 31 made of nylon resin facing 3
a is arranged just in case, on this can body holding part 31a,
As shown in FIG. 3, they are detachably attached to the outer part of the light alloy plate base 31b at equal intervals using screws 31c and 31d.

Further, the can body holding portion 31a is tilted at a predetermined angle α and is tilted at a predetermined angle α so as to be able to slide the can 15 at high speed from the infeet degree chute 36 (see FIG. 1) which supplies the can 15. A corrugated recess 31θ is formed at the bottom of the corresponding recess 81θ, and a narrow vacuum hole 31f for suctioning and holding the can body is formed at the bottom of the recess 81θ. Adjacent to the hole 31f, an air hole 31g75E is formed for use in discharging the can 15.A vacuum manifold 37 and a can discharging manifold 38 are installed on the fixed plate 34, respectively. These manifolds 37 and 38fl are in contact with the disk 30 for holding the can bottom at their sliding surfaces.The vacuum manifold 37 is connected to the can bottom holding stand 33, and also has a vacuum pipe (not shown). ) through the base 3
The suction port 31h of 1b communicates with the hole 31f. Further, the can discharge manifold 38 is connected to the hole 31 from the supply port 311 of the base 31b via an air pipe (not shown).
It is designed to supply air for can ejection to g.

A plurality of rotary probe units 39 are fixed to the rotating probe unit holding disk 32 by a split outer frame 40, facing the can bottom holding table 33 and the can body holding portion 31a. This rotary probe unit 39 is the eighth
As shown in the figure and FIG. 9, a self-comparison type eddy current flaw detection probe 39a is fitted into a hole in a block 39b made of light metal and fixed with a screw 39Q, and this block 391) is attached to the tip of a spindle 39d. ing. A timing pulley 39e is attached to the tip *i of this spindle 39d, and a fixed part S is attached to this timing pulley 39θ via a flat belt 41.
It is attached to the rotating shaft of the upper timing pulley 42 and motor 43, and is connected to the nine tie-bung pulley 44, and the motor 43 causes the flaw detection probe 39a to rotate about the axis of the spindle 39d. ing. However, the spindle 39 (L) is equipped with two bearings 39f, and the ring 39f is a seal collar 39g.

Via the spindle collar 39h, perring ring press, t391, outer ring presser collar 39j, inner ring presser collar 39k,
It is tightened by a bearing nut and washer 39tK, whereby the spindle 39d is rotatably supported by the bearing case 39m. The bearing case 39m, the holding presser 391fl, and a screw are fixed to the outer cylinder 39n. Zarani, the above m
The bearing part of g is sealed with grease using a grease seal and is designed to withstand high-speed rotation using a nine-lubrication system. Additionally, a rotating side coil 45 is spirally wound around the base end of the spindle 39cl in the longitudinal direction of the spindle 39d.
Then, from the flaw detection probe 39a to the spindle 39. A signal wire is wired through the path 39p in i. and,
A stationary coil 46 is provided on the outer circumferential side of the rotating coil 45.
The coils 45 and 46 are fixed to the outer cylinder 39n via the coil support 39q, and arranged with a certain clearance, and the signals from the flaw detection probe 39a are transmitted to the fixed side through the coils 45 and 46. A rotary transformer 47 is constructed. In addition, 39r in the figure is the rotary probe unit 39.
In order to adjust the clearance between the can flange part and the flaw detection probe 39a to a constant level when attaching it to the disc 32, there is an adjustment nut screwed into the middle part of the outer cylinder 39n. It is a rear camp for enclosing and protecting. Further, the rotational speed of the flaw detection probe 39a by the motor 43 is changed according to the rotational speed (revolution speed) of the main shaft 260 by the motor 20. In other words, as the orbital speed increases, 1
Since the time required to inspect one can flange is shortened, the rotation speed of the flaw detection probe 39a is increased so that it can scan at least one round of the can 7 flange.

In the disk 32, near the center of each rotary probe unit 39 and between each rotary probe unit 39,
12 head amplifiers 48 are installed (
(See Figure 4). Electric power is supplied to these head chains 48 via a slip ring 49 fixed to the main shaft 26 and a slider 51 fixed to a fixed member 50. In addition, in Figure @2, at the tip of the main shaft 26 protruding from the bearing case 52, there is a Mercury slip ring 53, which has very little electrical noise and is durable, to protect it from eccentric rotation of the main shaft 26. They are connected via a coupling 54 on the other hand. Further, a timing pulley 58 attached to the rotating shaft of an absolute neat rotary encoder 57 is connected to the tie pulley 55 attached to the tip of the main shaft 26 via a timing belt 56. Can holding part (
The stations) are sequentially numbered from 1 to 12, and the 4-bit signal from the rotary encoder 57 is used to identify whether these numbered stations are odd or even numbers, or to identify defective cans. The identification of existing stations, te, is used for time division multiplex transmission processing and the like. In the TFC, in Fig. 1, infeed chute 3
A discharge chute 59 for discharging the food cans is arranged below the cans 6 and inclined at a predetermined angle β.

Each of the head amplifiers 48 has a bridge circuit, and performs signal processing to amplify the flaw detection signal from each rotary probe unit 39 and convert the signal to a much lower frequency, about 1/4 of the detection frequency. This improves the shielding effect of mutual induction in the crowded signal post-processing process, prevents crosstalk, and eliminates the need to use high-quality cables for signal transmission. . Furthermore, in order to attach these head amplifiers 48 to a rotating body, they are designed to be small and lightweight, and to be able to withstand the centrifugal force caused by high-speed revolving motion.

The signals processed by these head amplifiers 48 are then transmitted to a time division multiplex circuit 60 attached to the same rotating body section A as the head amplifier 148, as shown in FIG. . This time division multiplexing circuit 60 is
Mercury slip ring 5 which is the next signal transmission path
3 cannot be multi-polarized due to its structure, and the time for detecting defects by the rotating probe unit 39 is limited. It is something that is transmitted. A synchronization pulse output from a synchronization pulse generation circuit 62 is input to the time division multiplex reception circuit 61 based on a 4-bit pulse signal (see FIG. 12) from the rotary encoder 57. The pulse is the 13th
As shown in the figure, this is the next signal that specifies the time (effective detection area described later) for the can flange at each station (can holder) corresponding to each station number. The synchronization pulses of even station numbers, for example, the synchronization signals of Nos. 1 and 2, overlap by 172 pulse widths. Also, between adjacent odd numbers or even numbers, for example,
A slight time gap is provided between the falling edges and the upper edges of the synchronization pulses No. 1 and 3, and No. 2 and No. 4, in order to avoid interference. The synchronizing pulse that has been input to the time division multiplex receiving circuit 61 is converted back into a 4-bit pulse signal shown in FIG. 12, and sent to the time division multiplex circuit 60 via the Mercury slip ring 53, where it is , are again converted into synchronization pulses designating each station shown in FIG. 13. As a result, based on the synchronization pulse, the time division multiplexing circuit 6o sequentially transmits the flaw detection signals from the specified odd-numbered head amplifiers 48 and the flaw detection signals from the even-numbered head amplifiers 48 to the Mercury slip ring 53. The time division multiplex reception circuit 61 shown in parentheses sequentially distributes the odd numbered flaw detection signals and even numbered flaw detection signals to the 12 defect signal collection circuits 63, respectively. It is configured as follows.

one! The pulse train shown at the top of FIG. 12 is inputted from the time division multiplex receiving circuit 61 to each of the defect signal acquisition circuits 63 described above. These defect signal acquisition circuits 63 perform analog cosine function analysis and band-pass filter processing on the flaw detection signals to extract defect signals, as shown at the top of FIG. 12 above. The transmission frequency band of the bandpass filter is automatically controlled by the pulse train signal.

It is designed to remove noise components from the flaw detection signal. Here, the reason why the transmission frequency band of the bandpass filter is controlled is that the rotational speed of the flaw detection probe 39a is configured to change according to the rotational speed of the main shaft 26. This is also affected by changes in the rotational speed of the main shaft 26, so it is necessary to correct this.

The defect signals extracted by each of the defect signal sampling circuits 63 are displayed on the signal monitor 64 and are also inputted to the discrimination circuit 66 via the OR circuit 67. Further, the output signals from each rotary probe unit 39 are transmitted to the head amplifier 48 and the time division multiplex circuit 6.
0. It passes through the Mercury slip ring 53, the time division multiplex reception circuit 61, and the defect signal acquisition circuit 63 as it is and is input to the self-diagnosis circuit 65.
5 is a circuit 66 that monitors the voltage of each of the output signals and determines an alarm signal when an abnormal voltage occurs.
It is designed to output to. Then, when the voltage of the defect signal picked up by each of the defect signal collection circuits 63 exceeds a predetermined value, the discrimination circuit 66 outputs a command signal to a sequencer (not shown) to detect the defect. This allows the cans to be discharged. Additionally, this discrimination circuit 66 displays the malfunctioning station number based on the single report signal from the self-diagnosis circuit 65, and
It is designed to display whether defective cans have been discharged or not, as well as the number of defective cans to be removed for each station.

Next, a case will be described in which the flange portion 15a of the can 15 is inspected using the defect inspection device for the runny portion of the food can 7 configured as described above.

First, by driving the motor 20, the timing pulleys 22, 25, the timing belt 23, and the reducer 2
4, the main shaft 26 is rotated. As a result, the pair of discs 30, 32 and the star wheel 31 fixed to the main shaft 26 rotate together with the main shaft 26. Along with this,
By driving the motor 43, the flat belt 41 wound around the timing pulleys 42 and 44 is rotated. As a result, the timing pulleys 39θ of the several rotary probe units 39 that are in contact with the flat belt 41 rotate, and the flaw detection globe 39a rotates together with the spindle 39d.

In this state, when cans 15 are continuously fed from the infeed chute 36, these cans 15 are placed in the recess 31e of the can body holding portion 31a of the star wheel 31 which is rotating Starwheel 31
rotates with

In this case, the can 15fl stored in the recess 31e and the can body are sucked by the vacuum from the hole 31f, and the can bottom is sucked by the vacuum to the can bottom holder 33, so that during high-speed continuous rotation, Not only will it not be blown outward by centrifugal force, but it will also be accurately positioned relative to the flaw detection probe 39a.

Next, as the cam 7 comes into contact with the cam 35, the can 15i approaches the rotating probe unit 39 side, and when the can 15 is closest, the flaw detection probe 39a of the rotating probe unit 39 By rotating the can 15 at least once along the seventh rank portion 15a, the flange portion 15a is inspected for defects. The detection signal detected by this flaw detection probe A-b 39a is sent to the 8-pad terminal 148 via the rotary transformer 47, and after signal processing, is sent via the time division multiplexing circuit 60 and the Mercury slip printer 53. The signal is then sent to the time division multiplex circuit 61 in the control box B on the fixed side, and then sent to the determination circuit 66 via each defect signal collection circuit 63.
It is determined whether the can is a defective can or a food can.

On the other hand, the can 15, which is suction-fixed by the can body holding part 31a of the star wheel 31 and the can bottom holding base 33 and is rotating, is stopped from suctioning the can bottom after the inspection by the flaw detection probe 39a, and The amount of protrusion toward the star wheel 31 side is small, and when the can bottom holder 33 is separated from the star wheel 31, the can bottom holder 33 is separated from the can bottom holder 33, and the distance between them becomes larger. , can 15
(in the case of defective cans) and delivery to the discharge chute 59 (in the case of food cans) can be easily carried out.

The above-mentioned operating principle will be explained in more detail based on FIG. 14. First, the can 15 fed from the infeed chute 36 is vacuumed to the can body suction area B1 and the can bottom holder at the can body holding part 31a. Can bottom adsorption area B at 33
2, the can body and can bottom are sucked and fixed to the outer periphery of the rotating star wheel 31 and disk 30. Then, as the star wheel 31 and the circle t130 revolve, the nine cams 35 attached to the fixed plate 34 enter the cam top dead center area B4 from the cam ascending area B3. In this cam top dead center region B4, the flange portion 15a of the can 15 is closest to the rotary probe unit 39, but in the initial stage of this cam top dead center region B4, the rotary probe unit 39 and the seventh rank portion 1
5a, it takes some time until stable detectability is obtained (adjustment region B5). Then, the can 15 enters the effective flaw detection area B6, and the flaw detection probe 3
9a scans the seventh rank portion 15a of the can 15 for more than one revolution at a rotation speed corresponding to the revolution speed of the star wheel 31,
Perform flaw detection.

Next, the can 15 enters a determination area B7 as to whether it is a food can or a defective can, and a determination is made in the determination circuit 66 according to the flaw detection result. After that, the cam 35 on the fixed platen 34 side enters the cam lowering area B8, and the can bottom holding stand 3 moves from the can bottom of the can 15
3 leaves.

On the other hand, the can bottom suction area B2 ends in the determination area B7, but the can body suction area B1 continues until just before the end of the cam lowering area B8, during which time only the can body is suctioned and fixed to the can 15. . Immediately before the upper J can body suction area Bl expires, the can body suction function is divided into an odd number suction area B9 and an even number suction area BIO according to the number of the can holding part (station). , the can body was previously attracted by one valve, but now it is operated by two valves, one for odd numbers and one for even numbers. Similarly, this area B9. In B10, the operation for discharging defective cans is performed in two valves. This a
%During high-speed revolution, if you try to cover 12 stations with only one vacuum valve and one air blow valve, there is a risk that you will not be able to time the discharge if defective cans come in succession. However, if the revolution speed is slow, one valve each may be sufficient. Then, in each area B9° BIO, the discrimination circuit 66 determines that the can is defective, and the nine-point control Vc is canceled in the suction Nμ of the can body of the can 15 determined to be defective, and in the area Bll, and the odd number Each area B9. At B10, the air blow valve opens and blows the defective can as shown in Fig. 14 (Fig. 1).
It is discharged downward at .

Mayu, if can 15 is determined to be a food can, then this can 15.
from the can body suction area B1 operated by one valve to the suction area B9 operated by two valves. After overlapping and transferring to B10, the can body is moved again to the suction area B12 by one valve, so that the can body is constantly rotated while being sucked, and the can body is transferred to the discharge chute 59 at the same time. The suction stops and it can be smoothly transported.

In this way, the inspection for defects in the flange portion 15a of the can 15 and the removal of cans with defective flange portions are continuously performed at high speed and reliably. In this case, the can 15 that is the object to be inspected is fixed to the outer periphery of the star wheel 31 and the disk 30,
Since it revolves together with the star wheel 31 and disk 30, there is no need to rotate the can 15 about its central axis as in the conventional case, and the can 15 will not be damaged. Next, along the flange portion 15a of the can 15, the flaw detection probe 39a of the rotary probe unit 39
At the same time, 12 rotary probe units 39 and 12 can holders (stations) were placed facing each other to ensure a one-to-one correspondence, and the distance between each rotary probe unit 39 and can 15 during flaw detection was adjusted to ensure a one-to-one correspondence. Adjust to the optimal condition,
It is easy to hold and can improve detection accuracy.

"Effects of the Invention" As explained above, the present invention provides a can revolution mechanism that holds and rotates a large number of cans that are sequentially conveyed;
A rotary valve σ-b unit that is provided opposite to the flange of the can held by this can revolution mechanism, moves in synchronization with the flange of the bracket, and rotates along the flange to inspect the flange. This apparatus is equipped with a determination circuit for determining the presence or absence of a defect in the flange portion based on the signal from the rotary probe unit collar, and a mechanism for removing cans determined to have a defect in the flange portion. The rotary probe unit moves in synchronization with the flange of the can that is held by the can revolution mechanism and rotates around the can, and rotates along the flange to rotate one can. A determination circuit determines whether or not there is a defect in the flange based on the inspection signal, and a removal mechanism removes cans determined to have a defect in the flange. In particular, it is possible to perform high-speed online inspection, and in combination with the ability to individually adjust the detection sensitivity of the rotating probe unit, it is possible to not only improve inspection accuracy but also to reduce the need for good cans through inspection. Not only can the above-mentioned removal be prevented, but also damage to the cans to be inspected can be prevented, and the equipment cost and installation area do not increase, which is an excellent companion effect.

[Brief explanation of the drawing]

1 to 14 show an embodiment of the present invention,
Fig. 1 is a side view, Fig. 2 is a front view, Fig. 3 is a side view of the can body holder, Fig. 4 is an explanatory diagram of the disk 32, Fig. 5 is a block diagram of the electric circuit section, Fig. 6 is a front view of the can bottom holder, No. 7
8 is a front view of the rotating probe unit, FIG. 9 is a side view of the rotating probe unit, FIG. 10 is a schematic configuration diagram of the rotating track, FIG. 11 is a cross-sectional view of the same, and FIG. A waveform diagram showing the output waveform of the encoder, Figure 3 is a waveform diagram showing the output signal of the synchronous pulse generation circuit, Figure 14 is a diagram of the operating principle, Figure 15 is a cross-sectional view of the can, and Figures 16 to 21. Figure 16 shows an example of a defect in a can flange. Figure 16 is an illustration of a 7-lunge crack, Figure 17 is an illustration of a scratch, Figure 18 is an illustration of a difference in level, and Figure 19 is an explanation of a chip. Figure, 2nd
Figure 0 is an explanatory diagram of wrinkles, Figure 21 is an explanatory diagram of included inclusions,
Figure 22 is a diagram explaining the principle of a conventional light tester, Figure 23
The figure is an explanatory diagram of a conventional inspection device for inspecting the 72nd part of can 7, and FIG. 24 is an explanatory diagram of the inspection section of the same device. 15... Can 15a... Flange portion 30... Disc 31... Star wheel 32... Disc 33... Can Bottom holding stand 38... Can discharge manifold 39...
- Rotating probe unit 66... Discrimination circuit 31a... Can body holding section 31g... Hole 311... Supply port.

Claims (1)

[Claims] A can revolution mechanism that holds and rotates a large number of cans that are sequentially conveyed, and a can revolution mechanism that is provided opposite to the flange of the can held by this can revolution mechanism and that moves in synchronization with the flange. A rotary probe unit rotates along the flange to inspect the flange; a determination circuit determines whether or not there is a defect in the flange based on a signal from the rotary probe unit; 1. A defect inspection device for a can flange, comprising a mechanism for removing cans determined to be defective.