1. The determination of reverberation time and noise values of various noise sources in the precision punching machine workshop: The reverberation time refers to the time when the indoor sound reaches a stable state, and after the precision punching machine sound source stops producing sound, the residual sound is reflected back and forth in the room and absorbed by the wall, and the average sound energy density decreases to one millionth of the original value. The longer the reverberation time, the more sound is reflected in the workshop multiple times, and the energy attenuation rate is slow. Under the same sound source conditions, workshops with longer reverberation time have higher noise than those with shorter reverberation time.
2. Selection of sound-absorbing materials for precision punching machines: The sound-absorbing board consists of 5 parts. Noise enters the sound-absorbing cotton through the small holes of the perforated board. One part is converted into heat energy through the vibration of the glass wool, and the other part is isolated by the outer steel plate, achieving the purpose of shared absorption and isolation. (1) The outer steel plate with a thickness of 2mm serves as sound insulation and support, and is the outer surface of the sound-absorbing board. (2) The middle part of the sound-absorbing board is made of sound-absorbing material, made of glass wool products, which is used to absorb sound energy and is the main component of noise reduction materials. (3) Fiberboard is pasted on the outside of the sound-absorbing cotton to prevent it from falling. (4) The transparent film is pasted on both sides of the sound-absorbing cotton to prevent moisture and prevent the sound-absorbing cotton fibers from falling off from the mesh holes of the inner perforated board.
3. Sealing treatment of sound-absorbing boards: As the sealing treatment of the entire production line involves splicing multiple small sound-absorbing boards into a closed body, in order to ensure the noise reduction effect of precision punching, it is necessary to control the gap between each sound-absorbing board during design and manufacturing, generally 1-2mm. In order to minimize the transmission of noise through these gaps and affect the noise reduction effect, sealant is usually used for gap sealing.
4. Ventilation treatment: Due to the heat generated by the operation of the equipment itself and the insulation properties of the sound-absorbing material glass wool, the temperature inside the production line is often 3-5 ℃ higher than the outside after being closed. When implementing noise reduction projects, exhaust fans are usually installed at the top of the soundproof wall to extract hot air from the enclosed space, creating negative pressure inside. External air can flow into the interior through the soundproof wall. When selecting an exhaust fan, choose a low-noise fan to avoid affecting the noise reduction effect.
5. Lighting treatment: Due to the isolation of the equipment from the external workshop lighting after the implementation of the enclosure project, an additional lighting system needs to be added inside the enclosure. In order to ensure the lighting required for production and later equipment maintenance, the designed illuminance should be above 500 lumens. The lighting system inside the enclosed body is individually wired with independent switches, ensuring convenient use without affecting the original power supply system. In addition, to prevent sudden power outages in the workshop, an emergency lighting system has been installed inside the enclosed area to ensure the safety of equipment and personnel.