Implementation of punch noise reduction project

Implementation of the punch noise reduction project:
1. Reverberation time of the workshop and the noise value of each noise source: Reverberation time means that the indoor sound reaches a steady state. After the sound source stops sounding, the residual sound is reciprocally reflected in the room and absorbed through the wall. The average sound energy density decreases. One millionth of the time. The longer the reverberation time, the more the sound is reflected in the workshop, the energy decay is slow, and the workshop with long reverberation time under the same sound source is more noisy than the workshop with short reverberation time.
2, the choice of sound-absorbing materials: the sound-insulation board has a total of 5 parts, the noise enters the sound-absorbing cotton through the small hole of the perforated plate, part of which is converted into heat energy by the vibration of the glass wool wire, and the other part is insulated by the outer steel plate. The purpose of the suction and sharing. (1) An outer layer steel plate having a thickness of 2 mm serves as a sound insulating and supporting function, and is an outer surface of the sound absorbing panel. (2) The middle part of the sound absorbing panel is a sound absorbing material, and the material is a glass wool product, which is used for absorbing sound energy and is a main component of the noise reducing material. (3) The fiberboard is attached to the outside of the sound absorbing cotton to prevent the sound absorbing cotton from falling. (4) The sound-transmissive film is attached to both sides of the sound absorbing cotton to prevent moisture and prevent the sound absorbing cotton filament from falling off the mesh of the inner perforated plate.
3. Sealing treatment of the sound absorbing panel: Since the sealing process of the entire production line is to splicing a plurality of small sound absorbing panels into one closed body, in order to ensure the noise reduction effect, it is necessary to control the gap between the sound absorbing panels during design and manufacture. Generally it is 1 to 2 mm. In order to prevent noise from passing through these gaps to affect the effect of noise reduction, sealant is usually used for gap sealing.
4, ventilation treatment: due to the heat generated by the operation of the equipment itself, coupled with the insulation properties of the sound-absorbing material glass wool, the temperature inside the production line is often 3 ~ 5 ° C higher than the outside. When implementing the noise reduction project, the exhaust fan is usually installed on the top of the sound insulation wall to remove the hot air in the enclosed space, so that the inside forms a negative pressure, and the outside air can flow into the interior through the sound insulation wall. Use a low-noise fan when selecting the exhaust fan to avoid affecting the noise reduction effect.
5. Lighting treatment: Since the interior of the equipment is isolated from the external workshop after the implementation of the closed project, the lighting system needs to be added to the enclosed body. In order to ensure the lighting required for production and maintenance of the later equipment, the design illumination reaches more than 500 lumens. The lighting system in the enclosed body is separately wired and independently switched 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 is installed in the enclosed body to ensure the safety of equipment and personnel.