Hook The Security Inspection and Scrap Requirements

 

1, human driver lifting mechanism with hook, at 1.5 times rated load load test for testing.

 

2, driving the lifting mechanism with hook to 2 times rated load load test for testing.

 

3, hook discharge load test, should not have any defects and deformation, KaiKouDu increase in the size of the original should be no more than 0.25%.

 

4, qualified hook, should be in hook low stress area printing marks, including the rated the weight, factory standard or name, inspection marks, production Numbers, etc.

 

 

In one of the following circumstances when hook should be scrapped:

 

(1) crack;

 

(2) the danger of the size of the original section wear 10%;

 

(3) than the original size KaiKouDu by 15%;

 

(4) hook body torsional deformation more than 10 °;

 

(5) hook dangerous section or hook neck produce plastic deformation;

 

(6) hook thread corrosion;

 

(7) piece of hook bushing wear of the original size of the 50% when, should replace bushings;

 

(8) piece of hook up to the original heart axis wear the size of the 5% when, should replace heart axis.