очищать внутри, вызывать повреждения, должны быть особенно осторожны, чтобы не; инструменты для очистки, легко устранить, не использовалась длительное время, резервные машины, хранить в сухом месте, провернуть вручную несколько раз.
22 /15 мин./ Прочтите отрывок из инструкции по уходу за шариковыми и роликовыми подшипниками и найдите предложения, в которых есть информация:
а) о том, каким образом следует проверить состояние подшипников до и после смазки; б) о том, какой звук свидетельствует' о том, что подшипники нуждаются в смазке; в) об определении состояния подшипника с помощью измерения температуры; г) о том, как можно определить неровность на поверхности роликовых подшипников.
Maintenance of Ball & Roller Bearings
In connection with the regular lubrications, more often if necessary, the bearings must be checked by listening to their sound during running before the lubrication & after it by using e.g. a wooden stick.
Only a slight buzzing sound is heard if the bearing is working satisfactorily. A whistling or creaking sound is a sign that the bearing should be lubricated. When the rolling surface is worn evenly, it first causes quite a steady bearing sound. As the wear increases, the sound grows gradually louder & becomes uneven.
temperature detectors near the bearing, the damage causing high temperature by friction can be detected. Thus the machine parts near the bearing can still be saved, although the bearing itself is damaged. It is often important that the developing rate of the damage in the bearing can be followed by measuring, because to determine the condition of the bearing by listening may be insufficient. Furthermore, it is better to detect the damage at an early stage, so that the replacing of the bearing can be arranged at a convenient time.
The unevenness developing on the rolling surface, "as well as its changes, can be detected quite accurately &, above all, objectively by means of a bearing control device & measuring nipples fitted near the bearings. Thus the results obtained are reliable. If the machine is not provided with the measuring nipples, these can easily be mounted afterwards on the working side.
23. Прослушайте/прочтите 12 рядов слов. В начале каждого ряда находится тестовое слово, за ним следуют 4 других, одно из которых близко по значению к тестовому. Назовите это слово./3 мин./
1. freedom: a) policy b) library с) effort d) liberty
2. final: a) fierce b) last c) festive d) famous
3. whole: a) young b) open c) entire d) proper
4. permit: a) allow b) pretend c) give d) travel
5. depart: a) find b) excuse c) leave d) live
6. observe: a) pull b) watch c) remain d) hear
7. occur: a) happen b) reach c) offer d) thank
8. ask: a) ride b) care c) take d) request
9. like: a) offer b) enjoy c) leave d) happen
10. receive: a) recite b) review c) get d) render -
11. desire: a) open b) close c) marry d) want
12. start: a) feel b) let c) begin d) finish
24. /6 мин./ Запишите со слуха или перепишите следующие слова. Используя эти ключевые слова, воспроизведите по памяти услышанную/прочитанную информацию об уходе за оборудованием с контактными кольцами.
Surface, to keep smooth & clean, a cloth dipped in petrol, insulating surfaces, brush holders, dry compressor air, lubricants must not be used, damaged surface, to turn slip rings, auxiliary / вспомогательный/ motor, pulley, at a speed, the recommended periphery speeds, to provide with sleeve bearings /неразъемные/, permissible/допустимая/ speed, direction. *
Maintenance of Slip-Ring Equipment. General.
The surface of the slip rings must always be kept smooth & clean. The slip rings are cleaned with a dry cloth or, if necessary, with a cloth dipped in petrol. Special attention has to be paid to all insulating surfaces of the slip rings & brush holders. Also dry compressed air may be used for cleaning. Lubricants of apy kind must not be used between the slip rings & the brushes.
If the surface of a slip ring is damaged, the slip rings must be turned.The turning is done by rotating the machine
