Commonly used Hoist and trolley Short link chain (lifting chain) shape. Its dimensions are: d represents the diameter or size of round iron; l represents the length of the inside or call the long section; b represents the width of the inside.
Materials are generally made of steel material. In particular, when using only the specified steel strength properties of these two materials, in addition to the chemical composition of on the outside, but also with mechanical treatment and heat treatment related. By the many trials, we learned that the chain made with molten steel, when it until 30cm in diameter
When the chain's fine degree equivalent to those made with steel. Such as chain diameter and then increase, then use more steel, so kind of steel to high temperature, while expansion nor sensitive.
load chain shortcomings. In terms of the cable
load chain it has the following disadvantages: sensitivity to overload and blow greater flexibility is very small, while the case of a sudden rupture produced.
Since the chain friction in phase between the Festival and the Festival produced a strong pattern. Weight due to the chain itself is very large, it can produce a large inertia force, so when the speed is large winch mechanism, quite inappropriate.
Application load and test load, the load can be divided into the following types.
1 Applied load (also known as permission load): this load chain can often afford those.
(2) Test load: this load for the whole chain must withstand the test load.
3 rupture load: each chain must be broken out three tests, this three tests must be able to withstand the load chain.
Tensile strength of the material we use a great relationship, but it should be a minimum of 35 kg / sq cm. In the welding section, usually lower than elsewhere in the intensity of 25-30%.