According to Zhang Xingdong, an academician of the Chinese Biomaterials Committee and the Chinese Academy of Engineering, the growth rate of the biomaterials industry is very fast. Its international market was only US$20 billion in 2000, and last year it reached US$150 billion. In the global economic downturn, the industry maintained an annual growth rate of 7% in the United States. As China, which is relatively less affected by the global economic downturn, the industry's annual growth rate has reached a staggering 30%, reaching a level of US$10 billion last year and accounting for more than 6% of the world's share. Zhang Xingdong predicts that in the future this industry will have a "blowout development." The biomaterial industry has the characteristics of low consumption, low pollution, and high-tech added value. For example, stents made of biomaterials weigh only 10 milligrams and prices are above 10,000 yuan.
The International Federation of Biomaterials Science and Engineering Society ** Nikolai Pepas called for the strengthening of interdisciplinary and cross-domain cooperation: “We are not only biologists and chemists, we have to find common ideas and go together Respond to problems."
According to the Chinese Society of Biomaterials, the World Biomaterials Conference was held in Sichuan. Not only does it indicate that China's biomaterials science has reached the world advanced level, but also shows that Sichuan is becoming an important base for international biomaterial R&D. As a demonstration province of bio-industrialization in China, Sichuan has incorporated bio-engineering and new materials industries into key development plans. The province's bio-engineering and new materials industries generated more than 190 billion yuan in output value last year. They have obtained a number of scientific research achievements with independent intellectual property rights and world-leading scientific research, and they have achieved transformation and application. At present, Chengdu has established a national biological industrial base and a national biomedical material base.
Promoting the industrialization of achievements is one of the top priorities of the Ninth Biomaterials Conference. The General Assembly held an industrialization forum. Zhang Xingdong introduced that after more than 10 years of hard work, China's biological material science and engineering research has focused on the frontier areas, from simple tracking and simulation to the original stage of innovation. However, compared with the international advanced level, there is still a big gap in China's industrial development.
The conference demonstrated the latest developments and cutting-edge technologies in international biomaterials science and engineering, and promoted the establishment of cooperative relations between international R&D management agencies, experts and enterprises through exchanges; and provided business opportunities for Chinese enterprises.
According to the organizing committee, the World Biomaterials Congress is the highest level and largest event in the world's biomaterials field and is held every four years. The conference is sponsored by the International Federation of Biomaterials Science and Engineering Society and the Chinese Society of Biomaterials. More than 3,000 industry professionals from 57 countries and regions around the world attended the conference, including a group of world-class biological material experts and 20 domestic academicians.
Cylinder piston sealing ring
The cylinder piston sealing ring is critical to the normal function of the cylinder. The piston sealing ring prevents the fluid from bypassing the piston, otherwise the pressure difference at both ends of the piston will be reduced, thus reducing the force that the cylinder can carry out the work. There are two kinds of sealing elements commonly used in cylinders, one is compression sealing ring, and the other is pneumatic sealing ring.
The piston is a pressure bearing part in the cylinder block. A cylinder-piston sealing ring is arranged on the piston to prevent blow-by in the left and right cavities of the cylinder-piston. The anti-wear ring on the cylinder piston can increase the guide of the cylinder block, reduce the wear of the cylinder piston seal ring and reduce the friction resistance. The width of the piston is determined by the size of the cylinder piston and the length of the required sliding section.
There are two kinds of materials commonly used for cylinder piston sealing ring. One is pure PTFE, also known as polytetrafluoroethylene, and the other is PTFE with graphite or PTFE with carbon fiber. PTFE piston ring, guide ring and throttle ring are new sealing materials that replace asbestos packing and cast steel piston ring. They are characterized by wear resistance, high temperature resistance, long service life and convenient maintenance and replacement.
It can be understood that in mechanical engineering, the cylinder (piston) with sliding closed head reciprocates through or against the pressure of fluid in a slightly larger cylindrical cavity (cylinder), such as in an engine or pump. A cylinder steam engine (qv) is closed by plates at both ends. The piston rod is rigidly connected to the piston and passes through one of the end cover plates through the gland and stuffing box (airtight joint).
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