Engineering noise reduction solution for hose cutting machine workshop

Time of issue:

2021-12-26

Engineering noise reduction solution for hose cutting machine workshop Determination of the reverberation time and the noise value of each noise source in the hose cutting machine workshop Reverberation time means that the indoor sound reaches a stable state, and the sound source stops after the sound... Noise reduction engineering solutions for workshops 1. Determining the reverberation time of the hose crimping machine workshop and the noise value of each noise source. Reverberation time means that the indoor sound reaches a stable state. After the sound source stops sounding, the residual sound is reflected back and forth in the room and absorbed by the wall, and the average sound energy density drops to One millionth of the original value (or the time required for the sound energy density to attenuate 60dB). The longer the reverberation time, it means that the sound is reflected multiple times in the workshop, and the energy decay rate is slow. Under the same sound source, the workshop with long reverberation time will have more noise than the workshop with short reverberation time. 2. Selection of sound-absorbing materials Figure 6 shows the basic structure of the sound-proof board. It can be seen from the figure that the sound-proof board is composed of 5 parts. The noise enters the sound-absorbing cotton through the small holes of the perforated board. The energy is converted into heat and consumed, and the other part is isolated by the outer steel plate to achieve the purpose of absorption and sharing. (1) The outer steel plate with a thickness of 2mm plays the role of sound insulation and support, and is the outer surface of the sound-absorbing panel. (2) The middle part of the sound-absorbing board is made of sound-absorbing material, made of glass wool, which is used to absorb sound energy and is the main component of the noise-reducing material. It mainly includes two aspects. On the one hand, the thickness of the outer steel plate, especially in places where low-frequency noise is relatively large, the outer steel plate needs to be thickened, because the sound absorption effect of sound-absorbing cotton on low-frequency noise is far worse than that on high-frequency noise. Absorption; on the other hand, it is the choice of the thickness of the sound-absorbing cotton. Generally, according to the size of the noise, 50-100mm is a commonly used thickness range value. In this noise reduction project, the noise value exceeds the standard more. In order to ensure the noise reduction effect, Make sure that the thickness of the sound-absorbing cotton is 100mm. 3. Lighting treatment Since the interior of the equipment is isolated from the external workshop lighting after the implementation of the enclosed project, a lighting system needs to be added to the enclosed body. In order to ensure the lighting required for production and later equipment maintenance, the design illuminance reaches more than 500 lumens. The lighting system in the enclosed body is individually wired and switched independently to ensure convenient use and does not affect the original power supply system. In addition, in order to prevent sudden power outages in the workshop, an emergency lighting system was installed in the enclosure to ensure the safety of equipment and personnel.

Noise reduction engineering solutions for workshops

1. Determining the reverberation time of the hose crimping machine workshop and the noise value of each noise source. Reverberation time means that the indoor sound reaches a stable state. After the sound source stops sounding, the residual sound is reflected back and forth in the room and absorbed by the wall, and the average sound energy density drops to One millionth of the original value (or the time required for the sound energy density to attenuate 60dB). The longer the reverberation time, it means that the sound is reflected multiple times in the workshop, and the energy decay rate is slow. Under the same sound source, the workshop with long reverberation time will have more noise than the workshop with short reverberation time.
2. Selection of sound-absorbing materials Figure 6 shows the basic structure of the sound-proof board. It can be seen from the figure that the sound-proof board is composed of 5 parts. The noise enters the sound-absorbing cotton through the small holes of the perforated board. The energy is converted into heat and consumed, and the other part is isolated by the outer steel plate to achieve the purpose of absorption and sharing.

(1) The outer steel plate with a thickness of 2mm plays the role of sound insulation and support, and is the outer surface of the sound-absorbing panel.

(2) The middle part of the sound-absorbing board is made of sound-absorbing material, made of glass wool, which is used to absorb sound energy and is the main component of the noise-reducing material. It mainly includes two aspects. On the one hand, the thickness of the outer steel plate, especially in places where low-frequency noise is relatively large, the outer steel plate needs to be thickened, because the sound absorption effect of sound-absorbing cotton on low-frequency noise is far worse than that on high-frequency noise. Absorption; on the other hand, it is the choice of the thickness of the sound-absorbing cotton. Generally, according to the size of the noise, 50-100mm is a commonly used thickness range value. In this noise reduction project, the noise value exceeds the standard more. In order to ensure the noise reduction effect, Make sure that the thickness of the sound-absorbing cotton is 100mm.

3. Lighting treatment Since the interior of the equipment is isolated from the external workshop lighting after the implementation of the enclosed project, a lighting system needs to be added to the enclosed body. In order to ensure the lighting required for production and later equipment maintenance, the design illuminance reaches more than 500 lumens. The lighting system in the enclosed body is individually wired and switched independently to ensure convenient use and does not affect the original power supply system. In addition, in order to prevent sudden power outages in the workshop, an emergency lighting system was installed in the enclosure to ensure the safety of equipment and personnel.

Keyword:

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