1.3 The impact of noise on people 1 The degree of noise on people's troubles According to the literature [1], the annoying degree of a certain intensity noise:
The degree of trouble = - 4.798 + 0.1058 [dB (A)] (5)
Among them: 5 - indicates extreme trouble; 4 - indicates very trouble; 3 - indicates more trouble; 2 - indicates slight trouble; 1 - indicates no trouble;
2 The effect of noise on conversation According to the literature [1], the effect of a certain intensity noise on the conversation:
If you can't hear it (%)=-11.47+0.1989[dB(A)] (6)
2 Case analysis According to the noise statistics of a mine environmental monitoring station for one month:
Through the analysis of the above data, the noise level of the stope environment is serious and the reliability is low. Measures must be taken to control and improve it to improve the efficiency of the stope system.
3 Noise control method The stope control should take comprehensive measures according to the actual situation to achieve better results. There are many ways to control noise. In the stope, you can control it as follows:
a. Replacement devices The equipments generated by general mining operations mainly include: rock drills , anchors, scrapers, mining vehicles, local fans, etc., and their noise intensity is in the range of 90-110db(A).
Replace the noise generating device or operation with a device or operation that reduces or eliminates noise. At present, the use of hydraulic trackless self-replacement equipment can reduce the noise of 10%-15% compared with pneumatic equipment, and the exhaust gas without oil mist can simultaneously improve the air quality under the well.
b. Improving noise sources Improving noise sources is one of the effective ways to reduce or avoid noise from sound sources. Generally, there are the following aspects:
(1) Reduce the friction between the machines. The main methods are: lubricating the machine; correctly calibrating the center, doing a good balance and magnetic balance; changing the material; improving the precision of machine manufacturing.
(2) Reduce airflow noise. In all large, noisy equipment, with a muffler, for example. A mine adopts 1K58 type local fan with BFVD type muffler. According to the measurement of field data, the noise can be reduced by 15-19dB(A).
3 Strengthen maintenance and repair parts maintenance, replace damaged parts in time, do not let parts loose to reduce noise.
C. Take personal protection In the working environment, workers need to wear ear protectors. The following table shows the protective effect of different materials on the human ear [3]:
At the same time as the earpieces are equipped with the rotating work system at the same time, the exposure time of the workers in the noisy environment is minimized.
4 Conclusion Based on the analysis of the stope noise, pointed stope current noise problems and propose specific improvement measures to improve overall system reliability, resulting in guidance for the actual production operations stope promote phosphorus ore The stope is developing in the direction of high efficiency, safety and high yield.
Corn Thresher,Corn Thresher Machine,Electric Corn Thresher Machine,Maize Thresher Machine
Hunan Nongyou Machinery Group CO.,LTD , https://www.harvesterequipment.com