Punch is a common equipment of mechanical processing, which causes a lot of noise when working, especially the high-speed automatic punching machine. The continuous high noise seriously endangers the surrounding acoustic environment. Generally, the noise of punch press reaches 95-110db, which does great harm to people's physical and mental health, and even leads to irreversible hearing damage.

In order to deal with the problem of noise pollution of punch, the punch is usually placed in an independent sound insulation room, which is the punch sound insulation cover. In order to obtain a very good effect, the method of sound insulation cover is very important, which plays a decisive role in the sound insulation effect of punch sound insulation cover.

Construction method of punch sound insulation cover:

1) Appearance and specification of sound insulation cover: it is determined according to the geographical environment and equipment layout of the construction site. On the basis of completely covering the noise source equipment, the requirements of basic maintenance and normal operation are considered. Reduce the size of the enclosure as much as possible to prevent unnecessary economic investment.

2) Structure of sound insulation cover: the key is composed of steel structure, sound absorption and insulation module, basic sound insulation access door, multiple sliding doors for sound insulation work, ventilation and heat dissipation device and lighting equipment.

3) Steel structure: according to the specifications and installation environment requirements of sound insulation cover, it must be constructed with high-quality profiles. Generally, the main structure is H-beam or square steel pipe, and the anti-corrosion method is to use galvanized profile or brush anti-corrosion paint. The auxiliary structure is generally angle steel, steel plate, etc

4) Sound absorption and sound insulation module: in order to consider the provisions of equipment maintenance, it may be necessary to dismantle all acoustic enclosures. Therefore, the sound insulation cover must have the characteristics of disassembly, so modular is selected. The total thickness of the sound absorption and insulation module is 100 mm, which is composed of: 1.5 mm high-quality galvanized sheet + 3 mm thick vibration and sound insulation coating + 100 mm thick Owens Corning environmental sound-absorbing cotton + sound absorbing glass cloth with high alkali density (to avoid the sound absorption cotton debris escaping into the surrounding environment) + 0.8 mm high-quality zinc plated metal perforated plate (the hole diameter is about 4 mm and the porosity is about 23%).

5) Sound insulation door: the sound insulation cover is equipped with a basic sound insulation access door to consider the general maintenance requirements, and to facilitate some auxiliary work. In addition, a sliding door is set to facilitate the removal and replacement of the mold shell, the installation of the fixture and other normal work. The sound insulation capacity of the sound insulation door shall not be less than the sound absorption and sound insulation module, and high and medium grade hardware accessories shall be used.

6) Ventilation and heat removal: because the sealing requirements of the acoustic enclosure are very high, it is similar to a completely enclosed space. Therefore, when the equipment is working, if the heat caused by the motor is difficult to release in the sound insulation cover, the temperature inside the enclosure is high. It may do harm to the service life of the equipment, and in serious cases, it may cause equipment failure, such as motor burnout. Therefore, it is necessary to set ventilation and circulation equipment in the sound insulation enclosure to ventilate and exhaust heat. The air vent must be set up on the sound absorption and sound insulation module of the cover. Generally, the air inlet is opened at the lower part of the side and the air outlet is opened at the top of the wall. The exhaust fan is equipped at the air outlet on the top of the wall to adopt forced ventilation when necessary. In order to prevent the noise from spreading from the tuyere, the ventilation muffler must be set at the tuyere to consider the requirements of noise reduction.