问题 问答题 简答题

水导轴承常见的故障是什么?怎样处理?

答案

参考答案:常见故障是瓦温升高,甚至超过规定而引起烧瓦事故。

对于橡胶轴承由于供水管路系统中水生物或其它杂物,造成供水系统堵塞,使润滑水压下降,进水量减少甚至中断,或因自流供水阀误关,而备用水自动装置又发生故障不能投入引起烧瓦事故。

事故停机后,做好安全措施,进行导轴瓦更新检修、在检修装配过程中,避免杂物混入,检修中应使轴承间隙、圆度、同心度、垂直度符合检修质量标准。同时,对供水系统进行全面检查、清扫,消除缺陷,以确保润滑水的可靠。

对于使用稀油润滑的导轴承,常因检修质量差,如油盆渗漏或毕托管安装位置不对等,使润滑油减少,冷却系统有缺陷,冷却水量不足或中断等,使轴瓦温度升高,甚至超过规定值而引起烧瓦。一旦发生烧瓦事故,应进行全面检查,查明烧瓦的原因,更换新瓦或重新研刮,并消除产生烧瓦的原因。

阅读理解

B

It was evening when my parents and I ventured across Nemeiben Lake, in Northern Saskatchewan. This vast lake had a unique reputation as being the best fishing and tourist resort.

With the boat undocked and the gear and luggage stored beneath the security of the seats, we set off into the setting sun at 8:30.

Unlike my parents , I had never been on a fishing boat before and was captivated(迷住) by the speed and grace in which it traveled through the waves. The lake was deserted as the sky began to darken and looked more threatening by the minute.

Suddenly the boat hit something with such a force that we all fell over in our seats. The whole boat shook for a moment, before water started to trickle slowly over stern. My father went to the back and after many attempts to start the engine, he began to look very worried. The water was now rushing in at a much faster rate, tipping the boat at an awkward angle.

We tried our best to hold on to something. The worst was yet to come. With our life jackets secured and fastened, we waited as the boat sank deeper into the water. We were soon immersed in the chilly depths. The biting cold was more terrifying than anyone could imagine.

My parents, who were dressed in floater jackets, clung desperately to each other, trying to keep their heads above water. I, on the other hand, wasn’t so fortunate. A strong gust of wind blew briskly across the lake, bringing with it, torrential rain and threatening thunderstorms. The strong waves carried me on into the night. The waves continued to pound violently, forcing me underwater.

The following morning a fisherman found us. By that time, our body temperatures were twenty-four degrees, which meant we were nearly dead. Later investigation showed that we had been in the water for fifteen hours.

60. What is the main idea of the passage?

A. An exciting experience my parents and I had

B. A disappointing experience my parents and I had

C. An adventurous experience my parents and I had

D. A strong experience my parents and I had

61. Unlike the other lakes in Northern Saskatchewan, the Nemeiben Lake____________.

A. was the most dangerous and threatening lake

B. was most famous for fishing and tourism

C. was the largest and deepest in this area

D. had a good reputation for its wildlife

62. What is the reason which caused the accident?

A. Because of the thunderstorms

B. Because the boat sank.

C. Because the boat hit something with force.

D. Because we had no life jackets

单项选择题