1. After every operation, check the screen cloth, screen freame two or three times in two weeks whether there are damage, rupture and loose. If there are, the operator should replace corresponding spares or screen cloth.

2. Check the connected joints and welded joints whether there are loose and damage. If there are, the operator should weld again or replace corresponding spares.

3. Check the motor every half month whether the motor lack of lubricating grease or operates abnormal.

4. Check the electrical connection whether there are electric wire aging. If there are, replace it timely so as to prevent sudden problems.

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