JP3054185U - Machine sound detector - Google Patents

Abstract

(57) [Problem] To provide an operating sound listener for machinery that is easy to listen to and that is easy to cost. SOLUTION: An operating sound listener comprising a microphone, an amplifier for amplifying and outputting an operating sound signal from the microphone, and a signal output means for outputting an output signal from the amplifier to external equipment, wherein: It is characterized in that a contact element made of a plastic material for listening is provided on the front surface.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

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

[0002]

[Prior art]

 Conventionally, there has been a "mechanical hearing device" disclosed in Utility Model Registration No. 3011106. It consists of a sound detector that propagates machine vibration, a hose that propagates the vibration propagated 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) If the sound detector is made of metal, careless contact with an electric circuit during work may result in a serious accident such as burnout of a machine due to electric shock or short circuit.

[0003] In addition, 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 does the listening sound vary greatly depending on the mounting position of the microphone on the machine, Good results cannot be obtained because ambient noise is also easily mixed.

[0004] Furthermore, in the machine abnormality inspection apparatus disclosed in JP-A-6-217576, JP-A-6-300619, etc., the inspection accuracy has been improved using a frequency analyzer or a microcomputer. Cost was high.

[0005]

[Problems to be solved by 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.

[0006]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, a machine operation sound listener according to the present invention provides a microphone, an amplifier that amplifies and outputs an operation sound signal from the microphone, and outputs an output signal from the amplifier to external equipment. A contact element made of a plastic material for hearing sound is provided on the front of the microphone.

[0007]

[Embodiment of the invention]

 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a machine operation sound listener (hereinafter simply referred to as a listener) of the present invention will be described with reference to the drawings.

According to FIG. 1, the listener of the present invention includes 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. And a contact output device 50 for listening to a sound on the front surface of the microphone.

Referring to FIG. 2, in a specific shape and structure, the hearing device 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 the support tube 56 (for example, 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.

[0010] 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, no special work experience is required of the workers. 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 converts the mechanical operation sound from the microphone 51 into a component of the abnormal sound frequency in the pass band shown in FIG. An abnormal sound emphasis circuit 61 for amplifying and outputting an abnormal sound only, and amplifying output (hereinafter referred to as an abnormal sound emphasis characteristic mode) by the abnormal sound emphasis sound circuit 61 to simply output a machine operation sound from the microphone 51. It is assumed that a switching means 62 is provided for switching so that amplification output (hereinafter referred to as flat characteristic mode) is performed as it is. That is, the amplifier 6 has an abnormal sound emphasizing 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, and R13 of the feedback circuit of the amplifier 6, and the switching means 62 uses a switch SW. As shown in FIG. 2, the amplifier 6 has a rectangular shape, and has a front end face connected to a power switch SW1, a switch SW2, a resistor VR1 for adjusting the magnitude of an output, and a plug 520 of a cord 52. A connection end 63 and a terminal 64 for connecting to headphones are provided. 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 normally heard can be heard, so that it is very easy to find a machine failure.

According to the experience obtained by the present inventor over many years of testing, it is preferable to perform the following procedure when checking whether or not there is an abnormality in a mechanical part of a machine using the hearing device described in the above embodiment. No. (1) First, the user listens in the flat characteristic mode. (2) Switching to the abnormal sound emphasis characteristic mode and listening. (3) Judgment: If 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 headphones, speakers, a tape recorder or a computer are provided as output terminals, but other external equipment is provided. May be provided.

[0017]

[Effect of the invention]

 In claim 1 or 4, 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 accidents such as electric shock and short circuit during work can be prevented. You. Therefore, it does not require workers to have any particular working experience.

Further, in the operation sound listener for machinery according to the present invention according to the present invention, the amplifier has an abnormal sound enhancement characteristic mode and a flat characteristic mode that can be switched with each other. Since abnormal sounds are emphasized and output, it is easier to find a machine failure.

Furthermore, in the third aspect of the present invention, the operation sound hearing device for machinery 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 using a hearing device, it is easy to record and analyze the operating sound.

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

Further, the operation sound hearing device for machinery according to the present invention has a simple structure, so that 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 operation 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)

[Utility model registration 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.