called cholinesterases, in the body. 本文来自辣&文*论~文'网，
毕业论文 www.751com.cn 加7位QQ324,9114找源文There are no reports of people swallowing or breathing the types of hydraulic fluids that cause these effects. When certain types of hydraulic fluids were put into the eyes of animals or allowed to touch the skin of people or animals for short periods of time, redness and swelling occurred. It is not known whether hydraulic fluids can cause birth defects or reproductive effects.
Is there a medical test to show whether I've been exposed to hydraulic fluids?
Hydraulic fluids can't be measured in blood, urine, or feces, but certain chemicals in the hydraulic fluids can be measured. Some of the hydraulic fluids stop the activity of certain enzymes, called cholinesterases, in blood and this activity can be measured. However, many other chemicals also cause this effect. This test isn't available at most doctors' offices, but can be done at special laboratories that have the right equipment.
Has the federal government made recommendations to protect human health?
There are no federal government recommendations to protect humans from the health effects of the major hydraulic fluids. However, mineral oil, the major chemical ingredient of one type of hydraulic fluid, is part of the petroleum distillate class of chemicals and there are regulations for these chemicals.
The Occupational Safety and Health Administration (OSHA) has set an exposure limit of 2,000 milligram per cubic meter (mg/m³) petroleum distillates for an 8-hour workday, 40-hour workweek. The National Institute for Occupational Safety and Health (NIOSH) recommends an exposure limit of 350 mg/m³ petroleum distillates for a 10-hour workday, 40-hour workweek.
Hydraulic technology has been the introduction of industry have a history of more than one hundred years. With the rapid development of industrial, hydraulic technology with each passing day. Along with mathematics, control theory, computers, electronic devices and the development of fluid mechanics, a hydraulic servo system. And as an applied science that has come of age, and form their own system and a well-established methods of analysis and design. The following is a method of hydraulic system design and attention to the problem:
The based of Hydraulic design of hydraulic drive system
The overall layout of the hydraulic machine and process requirements, including the use of hydraulic transmission by the type of machine, mechanical design made possible the implementation of the hydraulic components of the type and model, the implementation of components and their spatial position of the size range, the requirements of the degree of automation.
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