A), the production of noise hazards
1, the impact on the nervous system: headache, brain swelling, dizziness, tinnitus, sleepy insomnia, panic, memory loss, such as neurasthenia symptom group.
2, on the cardiovascular system: sympathetic nervousness, rapid heartbeat, arrhythmia, ECG T wave changes, conduction block. Blood pressure changes.
3. Effects on visual organs: eye pain, loss of vision.
4. Effects on the digestive system: loss of appetite, nausea, decreased gastric tone.
II), noise deafness
Noise deafness: deafness caused by operators working in a strong noise environment. Noise deafness is not easy to be detected early, because the hearing range of the human ear in the 20 ~ 20000HZ, but the higher sensitivity to high-frequency sound 2000 ~ 8000HZ. Early loss is mainly in the high frequency range. The International Organization for Standardization (ISO) has established a hearing loss of 25 dB as the standard for deafness. Normal hearing in the human ear ordinary conversation 55 ~ 65 dB, individual can be as low as 15 dB, generally believe that the hearing loss in 25 ~ 40 dB for mild deafness, 40 ~ 55 for moderate deafness, 70 ~ 90 for severe, more than 90 for extreme deafness.
Sound control and management
Principles of noise control and management: rooting out noise from the sound source, controlling it from the propagation pathway, and taking protective measures at the reception point.
1, sound source control
A, reduce the impact process and high-pressure gas venting process, as far as possible, welding instead of riveting, hydraulic instead of stamping, hydraulic instead of steam.
B, the selection of low-noise equipment, the use of mute materials to reduce the noise impact, the larger vibration of the equipment, piping and foundation, support for the use of flexible connections. Improve equipment processing accuracy and assembly quality.
C, the use of mechanization, high degree of automation of the production process and production equipment, the realization of remote monitoring operation.
D, improve the processing precision and assembly precision
2, from the noise transmission path control:
A, reasonable layout of the plant: the high noise workshop and low noise workshop are arranged separately, for the particularly strong sound source, can be set up in the remote area of the plant. Mechanical equipment in the same workshop, where process conditions allow, high and low noise equipment should be discharged in separate areas.
B, the use of barriers to prevent the spread of noise
3, from the source or propagation path to control the noise still can not meet the requirements, can be further muffling, sound insulation, acoustic vibration isolation, damping, and other acoustic technical measures to solve.
4, personal protection: after taking noise control measures, the workplace noise still can not meet the standard requirements, should provide appropriate protective equipment for workers (such as earplugs, ear muffs).