JPH11248527A - Operational sound listening unit for machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To listen operational sound of machines at low cost by providing a plastic contact element for listening sound in front of a microphone thereby facilitating the listening of sound. SOLUTION: The listening unit comprises a listening rod 5, and an amplifier 6. The listening rod 5 comprises a contact element 50 and a microphone fixed integrally through a supporting pipe 56 (e.g. a metal pipe). More specifically, end of the contact element 50 is inserted into a tubular body 54 and sealed with an annular gasket and the microphone is inserted into the tubular body 54 while touching the contact element and then they are stopped by the supporting pipe 56. A cord 52 for transmitting a signal from the microphone is passed through the supporting pipe 56. Since the contact element 50 is made of plastic, e.g. polycarbonate, ambient nose is scarcely mixed and accidents, e.g. electric shock and short circuit, are prevented during work. Consequently, no work experience is required for a worker. The contact element 50 may emit light by inserting an LED into a contact element made of transparent plastic.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an automatic engine engine,
The present invention relates to a machine operation sound listening device used in determining whether or not properties of a shaft or the like of a shaft of a machine such as a motor are good.

[0002]

2. Description of the Related Art Conventionally, there is a "mechanical hearing device" disclosed in Utility Model Registration No. 3011106. It is composed of a sound detector that propagates mechanical vibration, a hose that propagates the vibration transmitted to the detector as air vibration, and an ear connector connected to the other end of the hose. is there. As a usage method, an operator applies a sound detector to the machine, puts an ear connector on the ear, listens to the sound, determines whether there is an abnormal sound, and determines the properties of the machine. Such "mechanical hearing device" has the following disadvantages. (1) Workers are required to have a great listening experience. (2) When the sound detector is made of metal, careless contact with an electric circuit during operation may cause a serious accident such as burning of a machine due to electric shock or short circuit.

[0003] In some cases, instead of the sound detection element, a microphone and an amplifier for amplifying an electric signal from the microphone are used. However, not only the listening sound varies greatly depending on the mounting position of the microphone on the machine, but also the surrounding sound is greatly different. No good results can be obtained because the noise is also easily mixed.

[0004] Further, in the machine abnormality inspection apparatus disclosed in JP-A-6-217576, JP-A-6-300619, etc., the inspection accuracy is improved by using a frequency analyzer or a microcomputer. The cost has increased.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an operating sound listener for machinery which is easy to listen to and which is easy to cost. Is to provide.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a machine operation sound listener according to the present invention comprises a microphone, an amplifier for amplifying and outputting an operation sound signal from the microphone, and an amplifier for outputting the operation sound signal from the amplifier. In an operating sound listener comprising signal output means for outputting an output signal to external equipment, a contact element made of a plastic material for hearing sound is provided on the front surface of the microphone.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a machine according to an embodiment of the present invention.

Referring to FIG. 1, a listener according to the present invention comprises a microphone 51, an amplifier 6 for amplifying and outputting an operation sound signal from the microphone 51, and an output signal from the amplifier 6 for outputting to an external facility. In the operating sound listener including the signal output means 53, a contact element 50 for listening is provided on the front surface of the microphone.

Referring to FIG. 2, in a specific configuration, the hearing aid of the present invention comprises a listening rod 5 and an amplifier 6. As shown in FIGS. 2 and 3, the listening rod 5 is formed by integrally attaching a contact element 50 and a microphone 51 via a support tube 56 (for example, a metal tube). That is, the end of the contact element 50 is inserted into the tubular body 54 and sealed with the annular gasket 55, the microphone 51 is inserted into the tubular body 54 so as to adhere to the contact element 50, and
It is locked by a support tube 56 (for example, a metal tube). Further, a cord 52 for transmitting a signal from the microphone 51 to the amplifier 6 is inserted through the support tube 56.

Since the contact element 50 is made of plastic, for example, polycarbonate net, there is almost no mixing of ambient noise, and accidents such as electric shock and short circuit during work can be prevented. Therefore, the worker does not particularly require working experience.
The contact element 50 may be capable of emitting light. For example,
A light emitting diode is embedded inside the contact element 50 made of a transparent plastic material. This makes night work very convenient.

Further, as shown in FIG. 4, in the present embodiment, the amplifier 6 amplifies the mechanical operation sound from the microphone 51 by the component of the abnormal sound frequency in the pass band shown in FIG. An abnormal sound emphasizing circuit 61 for outputting and emphasizing abnormal sounds, and an amplified output of the abnormal sound emphasizing sound circuit 61 (hereinafter referred to as an abnormal sound emphasizing characteristic mode), which is simply amplified as it is from the microphone 51 to directly output the machine operation sound. (Hereinafter referred to as a flat characteristic mode). That is, the amplifier 6
Has an abnormal sound enhancement characteristic mode and a flat characteristic mode that can be switched with each other.

The abnormal sound emphasizing circuit 61 includes constants C11, C12, R11, R12, R13 of the feedback circuit of the amplifier 6.
The switching means 62 uses a switch SW. As shown in FIG. 2, the amplifier 6 has a rectangular shape, and has a power switch SW1, a switch SW2, a resistor VR1 for adjusting the magnitude of the output, and a plug 520 of the cord 52 on the front end face.
A connection terminal 63 for connecting to the headphone and a terminal 64 for connecting to headphones are provided. Further, a terminal 65 for connecting to a tape recorder or the like is provided.

The abnormal sound frequency pass band is obtained by analyzing an abnormal sound of a machine obtained in an experiment using a frequency analyzer, for example. For example, the abnormal sound frequency pass band for general shafts is as shown in FIG. On the other hand, the frequency pass band in the flat characteristic mode is as shown in FIG.

In the abnormal sound emphasis characteristic mode, when there is an abnormal sound of the machine, the abnormal sound is emphasized and output, and even a small operation sound that cannot be heard normally can be heard, so that it is very easy to find a machine failure.

As experience gained by the present inventor over many years of testing, it is preferable that the following procedure be used when checking for the presence or absence of an abnormality in a mechanical part of a machine using the listener described in the above embodiment. (1) First, the user listens in the flat characteristic mode. (2) Switching to the abnormal sound emphasis characteristic mode and listening. (3) Judgment: When the output in (2) is larger than or similar to the output in (1), it can be determined that the mechanism may be abnormal.

In this embodiment, terminals 63 and 64 for transmitting a machine operation sound signal to a headphone, a speaker, a tape recorder or a computer are provided as output terminals, but are connected to other external equipment. May be provided.

[0017]

According to the first or fourth aspect of the present invention, since the operation sound hearing device for machinery has a contact element made of polycarbonate for listening to the front of the microphone, there is almost no mixing of ambient noise, and there is almost no electric shock or short circuit during operation. Accidents are also prevented.
Therefore, the worker does not particularly require working experience.

According to the second aspect of the present invention, in the machine operation sound listener according to the present invention, the amplifier has an abnormal sound emphasizing characteristic mode and a flat characteristic mode which can be switched with each other. Is highlighted,
Finding machine failures is even easier.

Further, in the third aspect of the present invention, the machine operation sound listener according to the present invention is provided with a terminal for transmitting an operation sound signal to a speaker, a tape recorder, or the like as an output means. In addition to listening to the machine by using, the operating sound can be easily recorded and analyzed.

Further, in the fifth and sixth aspects, since the contact element is capable of emitting light or a light emitting diode is embedded therein, night work is very convenient.

Further, since the operation sound hearing device for machinery according to the present invention has a simple structure, the manufacturing cost is easy.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of a machine operation sound listening device of the present invention.

FIG. 2 is a perspective view of the operating sound listener of the machine of the present invention according to FIG. 1;

FIG. 3 is a cross-sectional view of a sound stick of the operation sound listener of the machinery shown in FIG. 2;

FIG. 4 is a circuit diagram of the amplifier shown in FIG. 1;

5 is a diagram showing an abnormal sound frequency pass band in the abnormal sound emphasizing characteristic mode of the amplifier shown in FIG. 4;

6 is a diagram showing a normal sound frequency pass band in the flat characteristic mode of the amplifier shown in FIG. 4;

[Explanation of symbols]

 5 listening rod 6 amplifier 50 contact element 51 microphone 52 cord

Claims (6)

[Claims] 1. An operation sound listener comprising a microphone, an amplifier for amplifying and outputting an operation sound signal from the microphone, and signal output means for outputting an output signal from the amplifier to external equipment. An operating sound listener for machinery, wherein a contact element made of a plastic material for listening is provided on a front surface of the machine. 2. The machine operating sound listener according to claim 1, wherein the amplifier has an abnormal sound emphasizing characteristic mode and a flat characteristic mode that can be switched with each other. 3. The operation sound listening device according to claim 1, wherein a terminal for transmitting the operation sound signal to a headphone, a speaker, a tape recorder, or a computer is provided as the output unit. vessel. 4. The operation sound hearing device for machinery according to claim 1, wherein the contact element is formed by a polycarbonate net. 5. The operating sound listener for machinery according to claim 1, wherein the contact element is capable of emitting light. 6. The hearing device according to claim 5, wherein a light emitting diode is embedded in the contact element.