Selection of shackles and scrap standards
Generally, the size of the shackle is small, but its bearing weight is large and the use range is also very wide, especially in the power, metallurgy, petroleum, machinery, railway, chemical industry, port, mining, construction and other industries. Know the following points before selecting a shackle:
Shackles can be divided into national standard shackles, American standard shackles, Japanese standard shackles, German-made shackles, European-style shackles, and BS shackles, of which American Standard is the most commonly used.
2. Safety factor
The safety factor of the shackle is 4 times and 6 times.
Shackles are made of carbon steel, alloy steel, and stainless steel.
4. General requirements
(1) The surface of the shackle should be smooth and free of cracks, sharp edges, overheating and other quality defects.
(2) The buckle body should be made of killed steel, and no cast iron or cast steel can be used.
(3) Drilling and repair welding cannot be performed on the shackle. If the buckle body and pin are permanently deformed, they cannot be repaired.
(4) The buckle body and pin should be inspected before use, and no serious wear, deformation or fatigue cracks can occur, and they cannot be used if they are.
(5) When using shackles, strictly observe the rated load, and do not use it too frequently or overloaded; and its lateral distance cannot be pulled, and a safety pin should be inserted.
(6) After the shaft pin is assembled, the width of the buckle body should not be reduced, and the thread should be well connected.
(1) The shackle can be rechecked with a magnifying glass to check for defects.
(2) During the test, double the safety load shall be used as the test load, and the shackle may be subjected to the sampling reliability test.
(3) The shaft pin cannot be permanently deformed, and can be rotated freely after being loosened; the shackle must not break or be deformed that affects its bearing capacity.
(4) Marks such as strength level and safety load shall be indicated on the button body.
6. Scrap standards
(1) There is obvious permanent deformation, or the pivot pin is not flexible.
(2) The amount of wear on the cross section of the buckle body and shaft pin is more than 10% of the original size.
(3) A crack appears in the shackle, or it cannot be locked, or the test result is unsatisfactory.
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