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我车间自1977年起,在3吨随后又在1吨及0.5吨蒸汽锤上试用塑料活塞环,一年来的实践证明,使用情况良好,经济效果显著。现将使用情况小结如下:
Since 1977, I have experimented with plastic piston rings on 3 tons and then on 1 ton and 0.5 ton steam hammers. Our practice has proved that it has been in good use and has remarkable economic results since 1977. Now the use of the situation are summarized as follows: