Bolt

Bolts: A fastener consisting of a head and a screw (with a threaded cylinder), which is fitted with a nut for fastening the connection of two parts with through holes.

Because the bolt is also a kind of railway accessories, railway accessories are part of the railway line, where the track refers to the rail, sleeper, connecting parts, track bed, anti-climb equipment, rail and turnout and so on.
As a holistic engineering structure, the track lay on the roadbed, plays a guiding role in the operation of the train, directly under the enormous pressure of locomotives and their loads. Under the motive force of the train operation, its various components must be of sufficient strength and stability to ensure that the train in accordance with the provisions of the highest speed, safe, smooth and uninterrupted operation.
Bolt detection is divided into artificial and machine two. Artificial is the most primitive and is the most commonly used consistent detection method. In order to minimize the outflow of bad products, the general production business personnel through the visual way to treat the packaging or delivery of products to test to exclude bad products (bad including tooth injury, mixing, rust, etc.).