JPH0785386A - Noise displaying device - Google Patents

Abstract

PURPOSE:To instantaneously and surely permit a worker to recognize that a noise level becomes more than a reference value so a to execute a noise preventing processing by providing an alarm light to be turned on when the noise level measured by means of a noise meter reaches a set value. CONSTITUTION:The noise displaying device 1 catches noise by a non-directional microphone 4 and a patrol-light lamp 3 is turned on when the noise level reaches a set value. Desirably, the noise meter is a integration-type noise meter and the noise level is an equivalent noise level. Thus, the worker is instantaneously and surely permitted to recognize that the noise level becomes more than a reference value so that he can immediately put on a noise preventing equipment and execute a processing for reducing noise from noise generation source at need. Then, a noise fault and inconvenience to a neighborhood are effectively prevented. When the equivalent noise level is measured, display corresponding to the average noise level within a prescribed time is executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a noise display device for displaying and warning when a noise level exceeds a reference value in facilities, equipment, work processes, etc. where noise is generated.

[0002]

2. Description of the Related Art In an environment where noise is generated, from the viewpoint of noise interference prevention, noise is measured on the site boundary line in accordance with the regulations of the Noise Regulation Law, or in accordance with the working environment measurement standards in accordance with the regulations of the Occupational Safety and Health Act. In a work environment where a noise level is measured and as a result, a noise level equal to or higher than the reference value is observed, for example, the operator is instructed to use soundproof protective equipment (earplugs).

However, even in such a working environment,
It is not necessary for workers to wear soundproof protective equipment at all times because noise above the standard value is not always generated, and when wearing earplugs, it may be delayed to notice the approach of dangerous materials. However, there is a downside that if you wear it continuously for a long time, your ears may become irritated. Therefore, in many cases, you should only wear soundproof protective equipment when the noise level exceeds the standard value.

[0004]

In order to prevent noise disturbance such as noise-induced hearing loss, it is necessary to immediately inform the operator that the noise level has exceeded a reference value and take measures such as wearing soundproof protective equipment. It is desirable to prompt, but it is impossible for all workers to be thoroughly informed by conventional transmission means such as a speaker in the background noise level exceeding the reference value.

In view of the above points, the present invention has an object to make an operator instantly and surely recognize that the noise level has exceeded a reference value, and therefore wears a soundproofing protector or a noise source. Therefore, it is possible to take measures such as noise reduction.

[0006]

The gist of the present invention is a noise display device provided with a sound level meter for constantly measuring a noise level and a warning light which is turned on when the noise level measured by the sound level meter reaches a set value. Yes, preferably, the sound level meter is an integral type sound level meter, and the noise level is an equivalent noise level. Equivalent noise level is defined as the noise level of continuous steady sound that gives a mean square sound pressure equal to this within the measurement time when the noise level changes with time. It is widely used as a representative value to represent, and can be directly obtained by using an integrating sound level meter.

[0007]

In the present invention, the noise level is constantly measured,
When the noise level reaches the set value, a warning light such as a patrol light can be turned on and visually transmitted to the worker, so that even if the noise level is high, the worker will not notice too much and immediately It is possible to start wearing soundproof protective equipment or measures for reducing noise from a noise source. In addition, when measuring the noise level with a representative value that represents the magnitude of noise within a certain measurement time, not with an instantaneous value, for example, the equivalent noise level, noise due to the type of noise (steady noise, intermittent noise, fluctuating noise) It is possible to absorb extreme fluctuations in the level and display the average noise level during that time.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The specific structure and operation of the noise display device according to the present invention will be described with reference to the embodiment shown in FIG. (Reflector is rotated) 3 is attached, noise is caught by the omnidirectional microphone 4, and the patrol light 3 is turned on when the noise level reaches a set value. Since the microphone 4 is attached to the end of the long cable 5, there is a large degree of freedom in the installation position. For example, even if the box 2 is attached to the wall, the microphone 4 can be placed away from the wall and the reflected sound It is possible to avoid picking up as much as possible. In addition, 6 is a noise level setting device.

In the noise display device 1, the microphone 4 is used.
The noise caught at is converted into a signal and enters the integrating noise meter 7 (see FIG. 2), where the equivalent noise level is obtained.
If the measurement time, which is the standard of the equivalent noise level, is too short, it will be easily affected by the extreme fluctuation of the noise level due to the fluctuating noise. However, it may be set appropriately according to the noise environment. Then, the comparison result of the equivalent noise level for the past 10 seconds (when the measurement time is 10 seconds) constantly measured by the integral sound level meter 7 and the set value by the noise level setter 6 is controlled by the comparator 8 The patrol light 3 is turned on when the measured value exceeds the set value and turned off when the measured value becomes lower than the set value.

The set value by the noise level setter 6 is appropriate in consideration of the change in the noise level value due to the way of obtaining the direction coefficient from the noise source at the mounting position of the present device and the change in the noise level value due to the distance attenuation. Should be set to any value. Also, the warning light is not limited to the above patrol light,
Other lamps may be used as long as they are visually recognizable, and intermittent lighting may be used.

[0011]

According to the present invention, it is possible to instantly and surely let the operator recognize that the noise level has exceeded the reference value, and immediately wear soundproof protective equipment, or if necessary. It becomes possible to take measures to reduce the noise of the noise source, and it is effective in preventing noise interference and nuisance to neighbors. In particular, when the equivalent noise level is measured using the integral type sound level meter, there is an effect that a display corresponding to the average noise level within a predetermined time can be displayed.

[Brief description of drawings]

FIG. 1 is a perspective view of a noise display device according to an embodiment of the present invention.

2 is a schematic block diagram of the apparatus of FIG.

[Explanation of symbols]

 3 Patlight lamp 4 Microphone 5 Cable 6 Noise level setting device 7 Integral sound level meter 8 Comparator 9 Control device

Claims (2)

[Claims] 1. A noise display device comprising a noise meter for constantly measuring a noise level, and a warning lamp which is turned on when the noise level measured by the noise level reaches a set value. 2. The noise display device according to claim 1, wherein the noise level meter is an integral type noise level meter, and the noise level is an equivalent noise level.