问题 问答题 简答题

挤出机的冷却系统的作用是什么?通常设置在何处?各有何作用?

答案

参考答案:

为了保证塑料在工艺要求的温度的条件下完成挤出成型过程。

料筒:挤出过程中,螺杆回转产生的摩擦剪切热有时高于物料的俗话所需要的热量。从而导致料筒内物料温度过高引起物料分解。故必须对其进行冷却。

螺杆:一方面,调整摩擦,提高固体输送率,提高生产率。另一方面,可控制制品的质量。

料斗座:避免加料段温度升高,产生架桥;同时避免挤压部分的热量传至止推轴承和减速箱,进而毁坏润滑条件。

单项选择题
完形填空
Yesterday, I met a delightful woman at a work event. As we talked, she told me about her       in Manila, Philippines. She spoke about the     her culture values their elders,and she explained that children are         from the time of birth to respect and          people older than themselves.
It was       to hear that,so I enjoyed listening and learning. Here is her memory       I found so beautiful:
When she was growing up, her father had three jobs to       his family. She said her dad never      , and though he worked very hard, he always had       for them. One day, her father was        at his full-time job. For several months, he was mailed temporary disability checks       he was recovering.
When her father was able to return to his full-time job, he took all those disability        that were sent to him while he was recovering and handed them back to the        . He told them that he had two good legs and arms, and did not need this money. He told them to give the money to people who could not work, to people who        needed it.
The woman telling the story was a little girl at that time. She had        her father that very day when he went back to his company        all those unopened checks. "My father is my hero," she      . Lowering her voice, she said she would never forget what he did, and what an           and influential mentor(导师) he was on how to live a life.
From my communication with her, it was          that her father's same sweet spirit had been       to this woman, and to her family. Hearing this story was so refreshing to my soul. I hope it is for you too.
小题1:
A.studyB.childhoodC.friendshipD.hobby
小题2:
A.wayB.patternC.memoryD.skill
小题3:
A.adoptedB.broughtC.attended D.educated
小题4:
A.greetB.admireC.honorD.welcome
小题5:
A.surprising B.refreshingC.convincingD.puzzling
小题6:
A.thatB.whatC.itD.this
小题7:
A.depend onB.watch over C.take inD.care for
小题8:
A.explainedB.apologizedC.complainedD.regretted
小题9:
A.foodB.clothingC.space D.time
小题10:
A.defeatedB.injuredC.firedD.punished
小题11:
A.whileB.thoughC.becauseD.since
小题12:
A.presentsB.goodsC.checksD.awards
小题13:
A.companyB.committeeC.communityD.charity
小题14:
A.frequentlyB.regularlyC.actuallyD.normally
小题15:
A.observed B.accompaniedC.supportedD.reminded
小题16:
A.onB.aboutC.forD.with
小题17:
A.remarked B.reportedC.sighedD.announced
小题18:
A.advanced B.effectiveC.inspiringD.honest
小题19:
A.possibleB.necessaryC.strangeD.obvious
小题20:
A.given inB.passed downC.held onD.handed out