JPS63122949A - Broken bottle detector - Google Patents

Abstract

PURPOSE:To enable accurate detection of even a fine crack caused in a bottle, by applying a specified mechanical impact to the bottle to generate an impact sound. CONSTITUTION:A component part K applies a specified level of mechanical impact to a bottle B with an impact member 5 fastened on a reciprocating rocking rod 6. At the part K, energization of an electromagnet 8 is controlled by ON-OFF signals to be supplied to a switch SW from a control circuit CCT. With such an arrangement, the rocking rod 6 reciprocates once between the position of the electromagnet 8 and the bottle B while the member 5 works to apply a specified level of mechanical impact to the bottle B with a head part Bn grasped under a specified pressure by a support member 3 of a support device S thereof B. The resulting impact sound is converted into an electrical signal by an acousto-electric converter M and amplified AMP to be supplied to an attenuation time measuring circuit DTM through a band pass filter BPF. Then, the resulting attenuation time thereof is compared with that of an impact sound obtained from the bottle B with no cracking to judge the presence of a broken bottle.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a broken bottle detection device used for detecting cracked bottles.

(Prior art) It is well known that cracks may occur in glass bottles during manufacturing, so the presence or absence of cracks and cracks has been detected on bottles for a long time. Instead of the most common method of detecting broken bottles by human visual inspection, it is also possible to automatically detect broken bottles using a broken bottle detection device.
This is disclosed in Japanese Patent No. 084.

The broken bottle detection device disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 52-73084 detects the magnitude of the impact sound generated when a mechanical impact is applied to a glass bottle. Focusing on the fact that the difference depends on whether or not a crack has occurred, we can detect broken bottles by applying a specified amount of impact to a glass bottle and measuring the loudness of the impact sound with a sound level meter. It was meant to be done.

(Problems to be Solved by the Invention) However, in the conventional broken bottle detection device disclosed in the above-mentioned Japanese Unexamined Patent Publication No. 52-73084, an impact of a predetermined magnitude is applied to a glass bottle. This is because a broken bottle was detected by measuring the volume of the impact sound generated using a sound level meter.

There is a problem in that it is difficult to detect broken bottles that are small or rank because the cracks that have occurred in the glass bottle must be very large to show any difference in the measurement results from the sound level meter. In addition, when detecting a broken bottle, there was a problem in that the detection results were largely affected by variations in the magnitude of the mechanical impact applied to the glass bottle.

(Means for Solving the Problems) The present invention provides a means for applying a predetermined mechanical shock to a bottle that is a target of bottle breakage detection to generate a ** sound, and a means for generating ** sound.
an acoustic-to-electrical transducer for converting sound into an electrical signal; a means for measuring the decay time of the electrical signal generated by the acoustic-to-electrical converter; The object of the present invention is to provide a broken bottle detection device comprising means for determining whether or not the bottle is broken.

(Example) Hereinafter, specific contents of the broken bottle detection device of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a block diagram of an embodiment of the broken bottle detection device of the present invention, and in this FIG. The support part aS of the bottle B, which is the object of broken bottle detection shown in the configuration example, is made by fixing the bottle support member 3 to the pillar 2 erected on the board 1 with, for example, a screw 4. It is made in a configuration mode.

Support device S for bottle B, which is targeted for the above-mentioned broken bottle detection
The bottle support member 3 in, for example, its tip 3a
is divided into two parts, and the neck part Bn of the bottle B, which is the target of broken bottle detection, can be held by the tip part 3a with a predetermined pressure. The surface of the tip 3a of the bottle support member 3 that comes into contact with the bottle is preferably coated with a material such as rubber.

In FIG. 1, K is a component for applying a mechanical impact of a predetermined magnitude to the bottle rim, which is the target of broken bottle detection, and 5 in the figure is a component for detecting broken bottles. An impact member 6 which collides with the bottle B which is the object of the operation and applies a mechanical impact of a predetermined magnitude to the bottle B, has the impact member 5 fixed to one end, and the other end is rotated. A swinging rod is rotatably supported by a swinging fulcrum 0, 7 is an adsorption member made of a ferromagnetic material fixed to the swinging rod 6, 8 is an electromagnet, SW is a switch, and 9 is a power supply. be.

The component for applying a mechanical impact of a predetermined size to bottle B, which is the object of bottle breakage detection, includes a component that applies a mechanical impact of a predetermined size to bottle B by the following operation. give a shocking impact. That is, first, a switch-on signal is supplied from the control circuit OCT to the switch SW, and while the switch SW is turned on and the electromagnet 8 is energized from the power source 9, the electromagnet 8 is fixed to the swinging rod 6. The attracting member 7 is attracted to the electromagnet 8.

Next, a switch-off signal is applied from the control circuit OCT to the switch SW at a predetermined timing in accordance with the detection operation start information inputted to the operation unit OP, the switch SW is turned off, and the electromagnet 8 is demagnetized. Then, the swinging rod 6 starts a pendulum movement about the rotational fulcrum 0, and the impact member 5 fixed to the tip of the swinging rod 6 detects the broken bottle. A mechanical shock of a predetermined magnitude is applied to B.

The swinging rod 6 described above makes a pendulum movement in the opposite direction to the direction of its previous movement and approaches the electromagnet 8.
At that time, from the control circuit OCT, the above-mentioned switch SW
By supplying a switch-on signal to the electromagnet 8 to excite the electromagnet 8, the swinging rod 6, which has approached the electromagnet 8 in the manner described above, will attract the adsorption member 7 fixed thereto.
is attracted by the electromagnet 8 and returns to the state shown in the first diagram.

In this way, the impact member 5 fixed to the swinging rod 6 that reciprocates with respect to the bottle B that is targeted for broken bottle detection.
A switch-on signal and a switch-off signal supplied from the control circuit CCT to the switch SW are applied to the component parts that are subjected to a mechanical shock of a predetermined magnitude by the control circuit CCT.
By controlling the energization state to the electromagnet 8, its swinging rod 6 makes one reciprocating motion between the position of the electromagnet 8 and the bottle B targeted for broken bottle detection.

The impact member 5 fixed to the swinging rod 6 is in a state where the neck Bn is held under a predetermined pressure by the bottle support member 3 in the support device S for the bottle B that is targeted for bottle breakage detection. A mechanical shock of a predetermined magnitude is applied to the bottle B.

As described above, the impact member 5 fixed to the swinging rod 6 that reciprocates has a neck Bn at a predetermined position with respect to the bottle support member 3 in the support device is for the bottle B that is targeted for bottle breakage detection. When a mechanical shock of a predetermined magnitude is applied to the bottle B which is being held under the pressure of , an impact sound is emitted from the bottle B. The above-mentioned impact sound generated from Bottle B has the highest amplitude at the beginning of its generation and decays over the course of an hour. The duration of the impact sound was
It was revealed that i is long when there is no crack in bottle B, and it decays relatively quickly when there is a crack in bottle B, and the degree of decay increases as the number of cracks in the bottle increases.

Figures 2 to 4 show "glass bottles of the same standard,"
This shows the attenuation characteristics of the impact sound generated by a normal bottle without cracks and a bottle with cracks when an impact of approximately the same magnitude is applied to each bottle.
FIG. 2 in FIGS. 2 to 4 shows the attenuation characteristics of the impact sound generated when a normal bottle with no cracks is subjected to an impact.

In addition, Figure 3 shows the attenuation characteristics of the impact sound generated when a bottle with a crack of 5 cm in length is subjected to an impact, and Figure 4 shows the attenuation characteristics of the impact sound generated when a bottle with a crack of 12 cm in length is subjected to an impact. This shows the attenuation characteristics of the impact sound generated by the bottle when an impact is applied.

In the present invention, the presence or absence of cracks in bottle B is detected by actively utilizing the above-mentioned phenomenon in which the impact sound d decay time changes depending on whether or not there are cracks in the bottle. A predetermined mechanical impact is applied to bottle B, which is the object of broken bottle detection, to generate an impact sound, and the generated W! Determine whether or not a bottle is broken by converting the impact sound into an electrical signal, measuring the decay time of the electrical signal, and comparing the measured decay time with the decay time of the impact sound in a bottle with no cracks. I am trying to do this.

That is, the above-mentioned impact sound generated by the bottle B is converted into an electrical signal by the acoustic-electrical converter M, and then the amplified WAM
After being sufficiently amplified there, it is supplied to the decay time measuring circuit DTM through a band pass filter BPF.

As for the decay time measuring circuit DTM, for the rising voltage value of the input signal to it.

Any configuration may be adopted as long as it can measure the time it takes for the amplitude value of the input voltage to attenuate to a predetermined ratio (attenuation time). The decay time measuring circuit DTM in the embodiment shown in FIG. 1 includes a rectifier circuit (detection circuit) DET to which the above-described input signal is applied, a smoothing circuit RC that smoothes the output signal from the above-described rectifier circuit DET, Comparator COMP
and a variable threshold voltage generation circuit SC which generates a threshold voltage having a low voltage value at a predetermined ratio with respect to the rising voltage value of the input signal and supplies it to the comparator GOMP.
C, a gate circuit GC to which the output signal from the comparator GOMP described above is supplied as a gate signal, and a control circuit CC.
and is adapted to be reset by a control signal from T.

It is shown as being constituted by a counter WNC that counts the number of pulses to be counted that have passed through the gate circuit GC.

The above-mentioned decay time measurement circuit DTM includes a bandpass filter B.
The input signal corresponding to the impact sound supplied from the PF is rectified by the rectifier circuit (detection circuit) DET, the output signal from the rectifier circuit DET is smoothed by the smoothing circuit RC, and the signal is output to the comparator COMP and the threshold voltage. It is supplied to the generation circuit SCC.

Since the comparator GOMP is given a threshold voltage that is lower at a predetermined ratio to the rising voltage value of the input signal generated by the threshold voltage generation circuit SCC, the output from the comparator GOMP The signal is always a pulse with a time width corresponding to the decay time of the input signal.

Therefore, the gate circuit GC to which the output signal from the comparator GOMP is supplied as a gate signal outputs the counted pulses supplied thereto from the control circuit OCT over a time span corresponding to the decay time of the input signal. .

Since the counter WNC that counts the output pulses of the gate circuit GC described above is reset by the control signal supplied from the control circuit OCT prior to the start of the counting operation, the input signal from the counter WNC is attenuated. A count value output indicating time is supplied to a digital comparator DCOMP functioning as a determination circuit.

For the digital comparator DC:OMP mentioned above.

A numerical value indicating the decay time of the impact sound in a bottle in a normal state with no cracks and having the same standard as bottle B, which is the object of bottle breakage detection, is preset via the operating unit OP and the control circuit OCT. Therefore, in the digital comparator to which the count value from the total number WIWNC in the decay time measuring circuit DTM is given as described above, the OK times signal output terminal 10 is output according to the difference from the preset value set in advance. or output an NG signal to the output terminal 11.

(Effects of the Invention) As is clear from the above detailed explanation, by applying a predetermined amount of impact to a glass bottle and measuring the loudness of the impact sound with a sound level meter, it is possible to detect broken bottles. With conventional broken bottle detection devices, cracks occurring in glass bottles need to be very large to show any difference in the measurement results from the sound level meter, so small cracks may occur. However, there were problems in that it was difficult to detect broken bottles, and that when detecting broken bottles, variations in the magnitude of the mechanical impact applied to the glass bottles appeared greatly in the detection results. The broken bottle detection device of the invention includes means for generating an impact sound by applying a predetermined mechanical impact to a bottle to be detected as a broken bottle, and an acoustic-electric device for converting the impact sound into an electrical signal. A transducer, a means for measuring the decay time of the electric signal generated by the acoustic-electrical converter, and a means for determining whether the bottle is broken based on the measurement result of the decay time of the electric signal. As a result, the broken bottle detection device of the present invention can reliably detect small cracks occurring on the bottle, and also satisfies the requirement for uniformity of the magnitude of the mechanical force applied to the bottle. It is not critical to the type of water, and the present invention satisfactorily solves all of the conventional problems mentioned above.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the broken bottle detection device of the present invention, and FIGS. 2 to 4 show the attenuation characteristics of impact sound. S...supporting device for bottle B, which is targeted for broken bottle detection;
B...bottle, Bn...neck of bottle B, K...component for applying a mechanical impact of a predetermined magnitude to bottle B, which is targeted for bottle breakage detection, OCT ...Control circuit, OP...Operation unit 1M...Acoustic-electrical converter. AMP...Amplifier, SW...Switch, DTM...
- Decay time measurement circuit, DET... rectifier circuit (detection circuit), RC... smoothing circuit, C: OMP... comparator, S
CC...variable threshold voltage generation circuit, GC...gate circuit, WNC...counter, DCOMP...digital comparator, 1...base plate, 2...pillar, 3...support member , 3a...Tip, 4...Screw, 5...Impact member that collides with bottle B, which is targeted for broken bottle detection, and applies a mechanical shock of a predetermined magnitude to bottle B. , 6... A swinging rod having the above-mentioned *m member 5 fixed to one end and rotatably supported at the other end by the rotation fulcrum 0, 7... The above-mentioned swinging rod 6 an adsorption member made of a ferromagnetic material fixed to; 8...electromagnet; 9...power supply; 1;
0,11...terminal,

Claims (1)

[Claims] A means for generating an impact sound by applying a predetermined mechanical impact to a bottle to be detected as a broken bottle; an acoustic-electrical converter for converting the impact sound into an electrical signal; and an acoustic-electrical converter for converting the impact sound into an electrical signal. A broken bottle detection device comprising: means for measuring the decay time of the electrical signal generated by the electrical signal; and means for determining whether the bottle is broken based on the measurement result of the decay time of the electrical signal.