JPS6150010A - Method for judging adequacy of volume of container - Google Patents

Abstract

PURPOSE:To judge the adequacy of the volume of a container accurately, by resonating the container at the resonance frequency of the container, and computing the volume of the container based on the detected signal of the resonance. CONSTITUTION:When a vibrator 2 is swept in a specified frequency range, a container 3 is resonated at the resonance frequency of the container 3. The resonance is detected by a sensor 8. Based on the detected signal, the resonance frequency is obtained by a signal processor 10. The volume of the container 3 is computed based on the obtained resonance frequency in a microcomputer 11. The adequacy of the volume as to whether the volume is within an examination reference value or not is judged. In this method, remaining of water in the container and the contamination of the inside due to use of water in the conventional method can be prevented. Thus the adequacy of the volume of the container can be automatically judged accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for determining the quality of a container such as a bottle.

[Prior art]

For example, if a lot of transparent bottles (containers) are injected with lotion, drinking water, etc. to make a product, if the volumes of the bottles vary and the difference in volume is outside the allowable range, many bottles Even if a certain amount of cosmetic liquid or drinking water is injected into the bottle, when these bottles are placed side by side, the height of the liquid level becomes noticeable, which gives an unpleasant impression to the user.

Therefore, manufacturers fill each bottle with water.
a, the volume of the bottle is measured by transferring this water to another container and measuring the volume of this water, and as a result, the bottle whose volume is within the inspection standard value is passed as a good product,
Bottles that do not meet the inspection standard values are excluded as defective products.

However, in such a conventional method for determining whether the volume of a container is good or bad, water remains in the bottle immediately after the water is drained from the bottle, making it impossible to immediately pour cosmetic liquid, etc. into the bottle. Since the inside of the bottle must be dried before pouring the lotion into the bottle, drying the bottle requires manpower and time, which increases the manufacturing cost of the product. Another drawback is that since water is poured into the container, the interior of the container is contaminated by impurities in the water.

[Problems to be Solved by Invention 9] The problems to be solved by the present invention are that it is possible to prevent contamination of the inside of a container where moisture remains inside the container, and to easily solve the problem. The object of the present invention is to enable automatic determination of whether the volume of a container is good or bad quickly and more accurately.

[Means for solving problems]

The present invention (in order to solve such problems), a container having a lid member having a hole of a predetermined diameter and length is tightly attached to the mouth part is vibrated, the vibrator is vibrated on a vibrator, and the vibrator is caused to vibrate at a predetermined frequency. A sensor installed near the hole detects that the container resonates at a resonant frequency determined by the volume of the container when swept over a range, and a frequency of 0 is determined based on the detection signal from the sensor.
The quality of the volume of the container is determined based on the resonance frequency.

[Effect]

When the vibrator is swept over a predetermined frequency range, the container resonates at its resonant frequency, and the sensor detects this resonance.
When the resonant frequency is determined based on the detection signal, the volume of the container can be calculated from this resonant frequency, and the quality of the container is determined based on whether or not this volume is within the inspection reference value.

〔Effect of the invention〕

・Instead of the original method of determining whether the volume of a container is good or bad by measuring the volume of the container using water, it is possible to determine whether the volume of the container is good or bad based on the resonance effect based on gas, and the conventional method uses water. This makes it possible to prevent contamination from spreading inside the container where moisture remains inside the container, and to automatically judge whether the volume of the container is good or bad easily, quickly, forcefully, and more accurately. As a result, the manpower and time conventionally required to dry the water remaining in the container can be saved, and the manufacturing cost of products using the container can be significantly reduced.

〔Example〕

First, an example of an apparatus for carrying out the method of the present invention will be described based on the drawings. In the figure, reference numeral 1 denotes a base, and a vibrator 2 made of, for example, ceramic is placed on this base 1. A container (bottle) 3 whose volume is to be judged is placed on top of the vibrator 2. A lid member (flat plate) 6 having a predetermined thickness and having a hole 5 is tightly attached to the mouth (not necessarily the upper part) 4 of the bottle 3, with the hole 5 concentric with the mouth 4. In addition, in order to improve the adhesion between the mouth part 4 of the bottle 3 and the lid member 6, the mouth part 4 is
An elastic member 7 is fitted or bonded to the portion that is brought into close contact with the holder. The diameter of the hole 5 is smaller than the inner diameter of the mouth 4 of the bottle 3.

Further, a sensor (microphone) 8 is provided near the hole 5 and facing the hole 5.

An amplifier 9 is electrically connected to the sensor 8, and a signal processor (frequency analyzer) 10 is connected to the amplifier 9. A microcomputer 11 is connected to this signal processor 10.
1 is connected to a temperature detector 12 and a variable frequency oscillator 13. This variable frequency oscillator 13 is connected to the vibrator 2.Next, the operation of the device having the above configuration and the method of the present invention will be explained.

First, a bottle 3 of unknown volume is placed on the vibrator Z, and the variable frequency oscillator 13 is activated to generate a frequency of O to 10 KHz.
Sweep the vibrator 2 continuously until. Then, the bottle 3 is moved by the vibration of the vibrator 2. The sensor 8 detects the resonance sound generated when the bottle 3 resonates, and sends the detection signal to the signal pro 10 via the amplifier 9. The signal processor 10 determines the resonance frequency from the detection signal of the sensor 8 and sends its output to the microcomputer 11.

The microcomputer 11 calculates the volume of the bottle 3 from the generally well-known resonance formula (11, (21) for the following cavity.
3] In addition to outputting the result as a calculation output 14 based on the formula, a signal 2 specifying the sweep frequency range of the vibrator 2 is sent to the variable frequency oscillator 13. Both 1 (1 frequency 'Jul(f
r (I-IZ) n, V: Volume of bottle 3 (m3),
a: Radius of the hole 5 (m), 10: Length (thickness) of the hole 5. Therefore, the volume of the bottle 3 is calculated by the formula V.

Note that in the above formula f31, the sound speed is determined from the temperature detected by the temperature detector 12. If the temperature is constant and the temperature is constant, the temperature can be input into the microcomputer 11 and the humidity detector 122 can be omitted.

Hereinafter, for bottles 3 of the same size, the microcomputer 11 commands a sweep frequency of only about ±10% near the resonant frequency of the bottle 3, thereby achieving accurate UIr determination of the resonance point and shortening the time. Do two steps.

Now, V = mouth of 500cc bottle 3 4vtC1t. −
A flat plate 6 with a hole 5 of 5111JIl and a=15r1M
The resonant frequency when bottle 3 resonates by bringing them into close contact is
When calculated from formulas (1) and (2) above, fr=38
0.3 Hz9, and when the volume of the bottle 3 is increased by one factor, fr=378.4H2, so these differences can be sufficiently detected by the seven signal processor 10.

Therefore, an automatic volume quality determination method is established in which the volume of the bottle 3 is measured to within ±1 tome and thereby determines whether the volume of the bottle 3 is good or bad.

If the resonance point is outside the audible range due to the relationship between the diameter of the hole 5 and the volume of the bottle 3, it is sufficient to change the diameter of the hole 5 and the thickness of the flat plate 6 and perform the test again.

In addition, although an icrophone is shown as an example of sensor 8, a highly sensitive micro-pressure sensor may also be used to detect air vibrations caused by resonance. It is possible to prevent or prevent workplace noise, and in this case it is also possible to use resonance due to harmonics higher than the fundamental frequency of resonance. Moreover, the lid member 6 is not limited to a flat plate, and may have a hole 5 of a predetermined diameter and length.
Any other shape may be used as long as it has the following.

[Brief explanation of drawings]

The drawing is a schematic longitudinal section (2) showing an example of an apparatus for carrying out the method of the present invention. 2... Vibrator, 3... Container (bottle),
4. Old... Mouth, 5... Hole, 6... Lid member (flat plate), 8... Sensor (microphone)
, io・kawa・signal pro sensor, 11...
Microcomputer, 13. Old variable frequency oscillator.

Claims (2)

[Claims] (1) When a container with a lid member having a hole of a predetermined diameter and length in close contact with the mouth is vibrated on a vibrator, and the vibrator is swept in a predetermined frequency range, the volume of the container is determined by the volume of the container. A sensor installed near the hole detects that the container resonates at a resonant frequency, and determines whether the volume of the container is good or bad based on the resonant frequency determined based on a detection signal from the sensor. How to judge whether it is good or bad. (2) The volume V of the container is: C = speed of sound, fr = resonance frequency, a = radius of hole, l_c = length of hole (plate thickness), β = π
/2, V=(C/2π)^2・Co/fr^2
The method for determining the quality of a container volume according to claim 1, wherein the determination is made by Co=πa^2/(l_c+β_a).