Kanghe security, taking the necessary noise reduction measures is necessary. The wood is low in holding pneumatic ablation, with an exhaust eliminator for reference. L noise generation mechanism and noise reduction measures ii noise generation mechanism is small holding pneumatic, and the noise of the six tools is mainly exhaust noise. In the exhaust port, due to the discharge of high-pressure gas, there is a suction effect on the surrounding air, so that it is rapidly mixed with the air near the exhaust port, causing a strong turbulent flow 2 force while the instantaneous pressure and flow velocity are randomly fluctuating, so that the sound wave Formal spokes, noise, especially medium and high frequency noise are prominent features. 1.2 Measures to Reduce Exhaust Noise For the mechanism of noise generation of hand-held pneumatic rock drilling tools, the following measures are taken to reduce the exhaust noise and reduce the gas flow velocity, so that the gas diffuses and the sound waves are attenuated. The muffler 1 introduced by Muwen reduces the airflow speed by 225 times relative to the inlet of the exhaust gas eliminator. The attenuated sound wave absorbs the sound energy through the sound absorbing material in the cavity of the muffler, and then converts it into heat energy, thereby achieving the effect of reducing noise. Aiming at the characteristics of the middle and high frequency noise in the noise spectrum, the sound absorbing material machine with good absorption of sound energy for medium and high frequency noise is used to fill the cavity of the muffler. 2 The structure and design of the exhaust muffler The structure of the exhaust muffler 14. Wire 5. The outer glass cloth muffler body and the muffler back cover are made of 3 steel, which are matched by the thread of 36 fathers. The sound absorbing material is made of ultra-fine glass wool with a density of 10,000, which has good absorption capacity for medium and high frequency noise. The sound absorbing material is wrapped in a glass cloth bag to prevent the discharged gas from blowing the sound absorbing material. Design and calculation of long-stroke non-metallic diaphragm air motor design Li Fucheng Department of Thermal Engineering, Northeastern University. The design and calculation of the parameters of Shenyang 0006 in Liaoning provide an example of numerical calculations. 1 It is summarized that the torque generated by the normally-connected air motor is small. The output power is not large, because the piston of this type of air motor has a small air chamber volume and a small amount of compressed gas input to the air motor. To improve the partition, the pneumatic horse wire mesh is used to fix the sound absorbing material and its outsourced glass cloth bag. The muffler is processed into the inner taper thread by the taper thread at the right end and the short tube welded at the exhaust port of the pneumatic rock drilling tool. . It will be fixed on the pneumatic rock drill only, 3 noise reduction and noise reduction effect according to the total vocal level noise, this exhaust muffler can reduce the noise by 252,748 people, even if the noise of the general pneumatic rock drilling tool is from the original 1诎 dropped to around 7580诎. The noise reduction effect is obviously different. The muffler noise reduction spectrum characteristics of this muffler are also better. 1 The output torque and output power of the exhaust muffler frequency muffling amount are listed. Naturally, it is thought to increase the piston stroke and increase the air cavity volume. The idea of ​​studying long-stroke non-metallic diaphragm air motors has emerged. In the literature 2, the main part of the air chamber and the upper part of the diaphragm 1 are proposed. For the design of the parameters of the air motor, the exhaust muffler has a good sound for the medium and high frequency 5008000 noise. Noise reduction effect. 4 Conclusion This exhaust muffler has good noise reduction effect, easy to manufacture, and low wood. The installation is not only suitable for the elimination and noise reduction of the factory-held pneumatic chisel, but also for the noise reduction and noise reduction of some other pneumatic tools. 1 Xu Shile and so on. Industrial noise and vibration control. Beijing Zhijin Industry Press. 1987.
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