JPS62211548A - Method and device for detecting buckled can - Google Patents

Abstract

PURPOSE:To improve the detection accuracy and to speed up and automate the inspection by detecting a buckled can by a laser sensor. CONSTITUTION:This device is provided with a conveying means which conveys cans 1, the laser sensor 13 equipped with a light emission part 14 for emitting laser beam to a can 1 and a light reception part 15 for receiving reflected light from the can at inspection position, a timing detection sensor 12 which times the operation of the sensor 13, a decision part 20, etc. Then, the light emission part 14 of the sensor 13 emits the laser beam to the can 1 conveyed by the conveying means to an inspection position A and the reflected light from the cam 1 is received by the light reception part 15 of the sensor 13; when the detection sensor 12 detects the can 1 reaching the inspection position, a signal is inputted from the light reception part 12 to the decision part 20. Then, the decision part 20 decides whether or not the can 1 is buckled from the signal from the light reception part 15 and outputs a signal based upon the decision result.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention deals with buckling cans that occur during the manufacturing process of one can,
This invention relates to a method and device for automatically detecting buckled cans.

[Prior Art] In the manufacturing process of canned goods, there is a process of wrapping one lid around the can body, a process of forming a flange on the mouth of an empty can with the lid wrapped tightly, or a process of wrapping one of the lids. In the process of performing neck-in processing and flange processing on the mouth of DI cans where the lid and can body are integrally formed, and furthermore, in the process of tightening the other lid after filling these empty cans with contents, etc. A large load may be applied in the axial direction of the can.

That is, in the process of winding the lid around the can body, the edge of the lid is tightened with a tightening roll while the lid is pressed and fixed to the can body using a zipper or the like. In addition, in the neck-in processing process for DI cans, the mouth of the can is squeezed inward while applying a load m in the axial direction with a drawing machine, and furthermore, in the flange processing process, a load m is applied in the axial direction with a flange machine. At the same time, the mouth of the can is opened outward.

For this reason, in the manufacturing process of cans, buckling often occurs on the can body.0 Cans with buckling on the can body have poor aesthetics, significantly impairing their commercial value, and can cause poor seaming. This was a major cause of poor sealing. Furthermore, due to the phenomenon in which a portion of the can body protrudes due to buckling, there is a drawback that the can can become clogged during transportation during the can manufacturing process.

Therefore, it is necessary to detect buckled cans and separate them from food cans, but it is important to understand that the biggest drawback of buckled cans, which is the loss of aesthetic appearance, is an intuitive method, and that there is no automatic detection method. Since there is no suitable method for detecting buckled cans, buckled cans have conventionally been detected by human visual inspection.

[Problems to be Solved] As described above, buckled seedlings have conventionally been detected by visual inspection by one person. As a result, there are problems in that there are variations in the criteria for determining whether or not a can is buckled, and that high-accuracy detection cannot be expected due to human detection errors due to worker fatigue or carelessness. Ta. In addition, it is difficult to speed up the two-inspection process using visual inspection by workers, and there are also major problems in automating the inspection and, by extension, the can manufacturing process.

The present invention has been made in view of the above problems, and
The present invention aims to improve detection accuracy by detecting buckled cans using a laser sensor, and to provide a method and equipment for detecting buckled cans that enables faster and automated inspection.

[Means for solving the problem] In order to achieve the above object, a method for detecting a buckled can according to the present invention includes the following steps:
A laser beam is emitted from the light emitting part of the laser sensor toward the can that has been transferred to the inspection position by the transport means, and the light reflected from the can is received by the light receiving part of the laser sensor, and the can is inspected by the timing detection sensor. When it is detected that the can has reached the position, the signal from the light receiving section is input to the determining section.The determining section then determines whether or not the can is buckled based on the signal from the light receiving section. At the same time, this is a method of outputting a signal according to the determination result.

Further, the buckled can detection device of the present invention includes a transport means for transporting the can, a light emitting unit that emits a laser beam toward the can, and a light receiving unit that receives reflected light from the can, which are arranged at the inspection position. The can is placed in the inspection position by the laser sensor and the transfer means.
A timing detection sensor detects the activation timing of the laser sensor, and a signal from the laser sensor determines whether or not the can is buckled, and outputs a signal based on the determination result. The system is composed of a discriminating unit that performs the determination, and a device that performs predetermined processing based on the output from the discriminating unit.

[Examples] Examples of the present invention will be described below with reference to the drawings.

First, an embodiment of the design of the present invention will be described based on the drawings. Figure 1 is a schematic plan view of the entire embodiment device;
FIG. 3 is a diagram illustrating the detection state, FIG. 3 is a circuit MR configuration diagram of the discriminating section, and FIG. 4 is a waveform diagram of each part showing the operating state of the device.

In these drawings, l denotes a can to be inspected for buckling. In this embodiment, the object of inspection is a so-called real can that has been filled with contents and has its lid tightened. In FIG. 1, 10 is a turret, which has a plurality of equally spaced pockets 10a on its outer periphery for transferring cans 1, and rotates at a predetermined speed. The cans sent from the seaming process are
12 is a timing detection sensor provided in the front auxiliary turret 11, which generates a pulse signal every time the front auxiliary turret 11 feeds the can 1 into the pocket 10a of the turret 10.

13 is a laser sensor, and a light emitting part 14 that emits laser light
and a light receiving section 15 that receives the light reflected on the can 1. In the vicinity of the examination position HA, the light emitting section 14 and the light receiving section 15
are arranged horizontally.

In the case of this embodiment, as shown in FIG. 14a and a first light receiving section 15a, and a second sensor 13 at the bottom.
The light emitting section and the light receiving section b are respectively a second light emitting section 14b and a second light receiving section 15b. These upper sensor 13a and lower sensor 13b are arranged so as to inspect, for example, a plurality of parts of one can 1 where buckling is most likely to occur (usually near the center of the can body).

16 is a rotating table, each pocket 10 of the turret 10
For example, the turret 10 is connected to rotating means (not shown) of the turret 10 for rotation. That is, the rotating table 16 rotates on its axis at the same time as the turret 10 revolves.

Reference numeral 17 denotes a rear-stage auxiliary turret, which sends out the cans 1 transferred from the inspection position HA by the turret 10 to the rear-process conveyance line from the turret 10 (portion 10a).

In addition, 18 is a can detection sensor consisting of a proximity switch etc.
Turret moved to inspection position IA, 10 blurs)
It is detected whether or not there is a can 1 in the loa, and only when there is one can 1, a signal is output to a discrimination circuit 20, which will be described later.

The determination section 20 includes a gate circuit 21, a first gate circuit 22a of the first light receiving section system, an l$- comparison circuit 23a, a second gate circuit 22b of the second light receiving section system, and a second comparison circuit 23b.
It is composed of a setting circuit 24 and a 1 discrimination circuit 25.

The gate circuit 21 sends the output from the timing detection sensor 12 to the first and second gate circuits 22a only when a signal is sent from the can detection sensor 18.

Send to 22b. Thereby, a buckled can is detected only when there is a can in the pocket lOa of the turret 10.

Also, first and second gate circuits 22a.

22b are first and second light receiving sections 15a, respectively, when a pulse signal is sent from the timing detection sensor 12 via the gate circuit 21;

15b to the first and second comparison circuits 23a.
, 23b. First and second comparison circuits 23a
, 23b compares the amount of light (voltage value) received by the first and second light receiving sections 15a and 15b with the value set by the setting circuit 24. As a result of the comparison, if the value is lower than the set value, that is, if the light receiving sections 15a and 156 do not receive reflected light of a predetermined amount or more due to buckling, a signal of the law level is output, and the reflected light of the predetermined amount or more is output. When receiving light, it outputs a high level signal.

The discrimination circuit 25 includes first and second comparison circuits 23a, 2
The comparator circuit 23a determines whether or not the can l is buckled based on the signal from the comparator circuit 23b.

When at least one output of 23b becomes low level, a buckled can detection signal is output.

Reference numeral 31 denotes a device for displaying the determination result, and based on the signal from the determining section 20, it displays whether the inspected can l is a long can or a buckled can. 32 is a solenoid pulp installed in the discharge air pipe 33, which is activated when the buckled can is discharged from the conveyance line.
Air is ejected from the exhaust air pipe 33 toward the exhaust position 2iB. The activation signal to the solenoid valve 32 is stored in the shift register register 34, and the number of buckled cans detected at the inspection position A to be sent to the discharge position B is determined in advance, and the shift The register 34 is configured to output the number when it is counted.

Next, an embodiment of the method of the present invention will be described.

The cans 1 that are sent sequentially from the seaming process are removed one by one from the turret 1 by the front auxiliary turret 11.
10a, and #! is placed on the rotating table 16. be placed.

As a result, one can 1 revolves and rotates on its axis, and the inspection position is 2t.
When the 0 can 1 transferred to A is transferred to the inspection position 2iA, a pulse signal is output from the timing detection sensor 12 and sent to the gate circuit 2z of the discrimination section 20.

On the other hand, the light emitting parts 14 in the upper and lower laser sensors 13a and 13b disposed near the inspection position fiA
a and 14b constantly emit laser light. and 1
1 can 1 if there is no buckling in can 1 (within tolerance)
A predetermined amount of the reflected light from the can 1 enters the light receiving parts 15a, 15b, and if there is buckling (outside the allowable range), the reflected light from the can 1 is diffusely reflected and the light receiving parts 15a, 15b According to the laser sensors 13a and 13b, which use laser light with better directivity than normal light, even small buckling can be detected with high accuracy.

The reflected light received by the light receiving sections 15a and 15b is input into the first and second gate circuits 22a and 22b of the upper discriminating section 20, where it is converted into a voltage.

On the other hand, when the above-mentioned can detection sensor 18 detects the presence of the can 1 in the turret 7 10a, the timing detection sensor 12 sends signals from the timing detection sensor 12 via the gate circuit 21 to the first and second gate circuits 22a, A pulse signal is output to 22b. As a result, the first and second gate circuits 22a.

22b further sends the signals from the light receiving sections 15a and 15b to comparison circuits 23a and 23b. Then, the voltage corresponding to the reflected light from the can 1 is input to the comparison circuits 23a and 23b, and compared with the set value from the setting circuit 24.

The comparison circuits 23a and 23b pass the comparison results to the discrimination circuit 2.
5 outputs a buckling detection signal when a low level signal is sent from at least one of the first and second comparison circuits 23a and 23b. A buckling non-detection signal is output when a low level signal is not sent from either.

The discrimination signal from the discrimination circuit 25 is sent to the display device 31,
Here, the results based on the signal are displayed. 1 at the same time
If the determination result is that a buckled can is detected, the determination signal is stored in the shift register 34.

When the inspection is completed in this way, the can 1 that has been inspected is
are sequentially transferred by the turret 10, and sent to the next process conveyance line by the rear auxiliary turret 17.
When the result of the inspection is that a buckled can is detected,
The number of cans sent to the discharge position glB is set in shift register 3.
4 (for example, by counting pulse signals from a timing detection sensor), and when the buckled can reaches the discharge position B of the conveying line, sends an actuation signal to the solenoid valve 32 to start the discharge. Air is blown out from the air pipe 33 to remove the buckled can from the line.

In the above embodiment, the laser sensor 13 is arranged at one location in the rotational direction of the turret 10 to detect buckling of the can, but when the rotational speed of the turret 10 is high, the detection accuracy In order to increase this, a plurality of laser sensors 13 may be arranged at different intervals in the rotational direction of the turret 10 to closely inspect buckling on the circumferential line 1 of the outer periphery of the can.

Further, in order to improve the detection accuracy in the longitudinal direction of the outer periphery of the can in a straight line, a plurality of laser sensors 13 may be arranged at different positions in the rotational direction of the turret 10 by changing the longitudinal position of the laser sensors 13.

In addition, it is also necessary to detect buckled cans at the same time as other processes. a for can 1 rotating within
While tightening the can 1, it is transferred to an inspection position 'r1A, and buckling of the can 1 is inspected at this inspection position fiA. In this way, a separate and independent buckled can detection step is not necessary, and the buckled can detection device can also utilize a lid tightening device, making it possible to increase the rigidity of the device.

Furthermore, the present invention is not limited to the above-described embodiments, and includes, for example, the following modifications.

■ Method and device for detecting buckling of empty cans.

■ A method for detecting buckled cans in which a set of laser sensors or three or more sets of laser sensors are arranged vertically for more accurate detection (in this case, multiple laser beams will be emitted). That device.

■ A method and device in which a set or multiple sets of laser sensors with a light emitting part and a light receiving part arranged vertically are arranged in the rotational direction of the turret to detect buckled cans in the circumferential direction around the outer periphery of one can. .

(2) A method and device in which a prism or the like is provided on the light emitting part side, and a plurality of laser beams are emitted from one light emitting part to detect a buckled can.

■ A method and device for detecting buckled cans by making the light-converging surface of the light-receiving section concave in order to improve light-converging performance.

(2) A method and device for detecting a buckled can by emitting a laser beam from one light emitting section when a signal from a timing detection sensor is input, and thereby timing the operation of the laser sensor.

■ A method of detecting buckled cans after drying the liquid adhering to the outer circumferential surface of the can with air or a dryer such as a heater, and the device. If so, diffuse reflection may occur, causing detection errors.

(2) A method and apparatus for detecting buckled cans by transporting cans by a rotary transport means other than a turret, or by a linear transport means such as a belt conveyor.

(2) A method and apparatus for detecting buckled cans by rotating the can using a rotating means other than a rotary table, such as a belt or a roll.

[Co., Ltd.] A method and device for detecting a buckled can by using a timing detection sensor such as an optical sensor or a magnetic sensor and placing it near the inspection position, thereby timing the operation of the laser sensor.

(2) A method and device for detecting a buckled can using a circuit other than the above as a constituent circuit of the discriminator.

@ A method and device for detecting a buckled can by sounding an alarm or flashing an indicator light as a predetermined process when a buckled can is detected.

O Use a buckling can removal device other than the air removal type! Icf! 1
and a method and apparatus for detecting buckled cans by providing a removal device near the detection position if necessary.

[Phase] A method and apparatus for detecting buckled cans around the entire circumference of the can by rotating the can once at the inspection position (the turret rotates intermittently).

- A method and apparatus for detecting a buckled can by appropriately combining the above-described embodiments and modifications.

[Effects of the Invention] As described above, according to the present invention, by detecting buckled cans using a laser sensor, it is possible to improve the detection accuracy and speed up and automate the inspection.

[Brief explanation of drawings]

The drawings relate to an embodiment of the present invention, and Fig. 1 is a schematic plan view of the entire embodiment device, Fig. 2 is a diagram explaining the detection state, Fig. 3 is a block diagram of the circuit configuration of the discrimination section, and Fig. 4 is a diagram of the device. It is a waveform diagram of each part showing an operating state. l: Can 10: Turret ll
: Front stage auxiliary turret L2: Timing detection sensor 13 (13a, 13b): Laser sensor 14 (eye 4,
14b): Light emitting unit 15 (15a, 15b): Light receiving unit 16-rotary table

Claims (6)

[Claims] (1) A laser sensor emits laser light from the light emitting part of the laser sensor toward the can that has been transferred to the inspection position by the transport means, and the light receiving part of the laser sensor receives the reflected light from the can, and the timing detection sensor When it is detected that the can has arrived at the inspection position, the signal from the light receiving section is input to the determining section, and then the determining section determines whether or not the can is buckled based on the signal from the light receiving section. A method for detecting a buckled can, characterized in that it determines whether the can is bent or not, and outputs a signal according to the determination result. (2) The method for detecting a buckled can according to claim 1, wherein the signal corresponding to the determination result that the can has buckling is a signal for activating a device for removing a buckled can. (3) The buckling can according to claim 1 or 2, wherein the laser beam emitted toward the can from the light emitting part side of the laser sensor is a plurality of laser beams. Detection method. (4) A laser sensor comprising a transport means for transporting a can, a light emitting part for emitting laser light toward the can, and a light receiving part for receiving reflected light from the can, arranged at an inspection position, and the transport means When the can is transferred to the inspection position, a timing detection sensor detects the activation timing of the laser sensor, and a signal from the laser sensor is used to determine whether or not the can is buckled. 1. A buckled can detection device comprising: a discriminator that outputs a signal based on the determination; and a device that performs predetermined processing based on the output from the discriminator. (5) The buckled can detection device according to claim 4, wherein the device that performs the predetermined process is a device that removes buckled cans. (6) Buckling according to claim 4 or 5, characterized in that the laser beam in the laser sensor is a plurality of laser beams, and the number of light receiving parts is the same as the number of laser beams. Can detection device.