问题 问答题 简答题

MT-2,MT-3,ST型缓冲器构造作用原理。

答案

参考答案:

MT-2、MT-3型:当缓冲器受冲击时,中心楔块与楔块沿着固定斜板滑动,同时夹紧动板。当楔块移动到一定距离后与动板一起移动,这时动板、固定斜板与外固定板构成另一组摩擦部分,消耗吸收一部分动能,并共同推动弹簧座压缩内、外弹簧和角弹簧,将一部分冲击动能转变为弹簧的位能。当缓冲器卸载时,复原弹簧借助弹力使中心楔块复位,防止卡滞。

ST型:当推力锥收到冲击时,摩擦楔块沿着箱体口部的斜面向里移动,这时将有一部分冲击动能转换为热能而消失。同时,限位垫圈收到摩擦楔块的压缩而压缩内、外圆弹簧,将一部分动能转换为弹簧的势能而储存。当冲击动能消除时,圆弹簧储存的势能又推动热力锥和摩擦楔块向外移动,这样就通过摩擦楔块与箱体口部斜面的摩擦,将弹簧的势能转化为热能而消失。

阅读理解

If someone says to you: “ Give me five”, do not search your pocket to get five yuan! It will make others laugh! The person’s not asking for your money, but your fingers.

In the US, “ give me five” or “ give me the high five” is a popular gesture ( 动作 ). You can see it often in films or on TV. It means the clapping ( 拍  ) of each other’s raised right hands together.

People do it when they meet for the first time or something happy happens. For example, a student has good marks in exams or wins a lottery ticket ( * *   ). If a football team wins a game, the players will give high fives to everyone around to celebrate.

This gesture may come from the old Roman gesture of raising the right arm for the king. This showed that the person raising his arm did not have a sword ( 剑 ) in his hand.

Why not try to give the high five to your friends?

小题1:“ Give me five” is a gesture to ______________.

A.ask for money

B.celebrate success

C.search one’s pocket

D.play小题2:The gesture “ give me five” is the clapping of _________.

A.toes

B.hands

C.arms

D.legs小题3:When you ________, you give your friends high fives.

A.lose your money

B.go back home

C.win a football game

D.do badly in exams小题4:The gesture started in _______ according to the story.

A.Rome

B.America

C.China

D.Britain小题5:Why did the Romans raise the right arm for the emperor?  Because ________.

A.they were proud of their emperor

B.they were happy to see the emperor

C.they wanted to show there were no swords in their hands

D.We don’t know

多项选择题