Underground Coal Mining Central Scraper Chain Of Tunneling Machine

Central scraper chain of tunneling machine 

Scraper conveyors usually use a single strand or double strand arrangement. Large flights are attached to the chain and these chains scrape the material, usually along a trough. The chains do not travel through the material as they run above the trough, with the return strand running above this.

The idea behind these conveyors is to use the chain and flights to slide the material through the trough between an inlet and outlet. Material can be loaded either through the sidewall of the trough, or it can be dropped between the chains. The outlet is usually a hole in the bottom of the trough, just in front or below the head shaft.

Several different chains are usually used in these conveyors including roller conveyor chains, bush chains, block and bar chains and welded steel chains. A, M and G type attachments are usually used to secure the flights to the chain, with the flights themselves manufactured from a wide range of materials included cast and fabricated steel, cast iron, various plastics and wood. The type of flight material used depends upon the type of material being conveyed.

Scraper conveyors are mainly used for conveying free flowing bulk materials such as animal feed, potash and lime.

The scraper chain of the tunneling machine is an important component of the tunneling machine, mainly used for transporting materials such as coal and gangue underground in coal mines. Scraper chains are usually composed of chains and scrapers, with the chains fixed inside the open chute of the excavator and conveying materials through the movement of the scrapers.
Structure and Working Principle
The working principle of the scraper chain of the tunneling machine is to use the open chute as the material support, fix the scraper on the chain (forming the scraper chain), and use it as the traction component. When the chain moves, the scraper pushes the material forward along the chute, thereby achieving material transportation.
Material and Manufacturing Process
The material of high-strength scraper chains for mining is usually high-strength alloy steel. The manufacturing process includes steps such as cutting, forging, machining, heat treatment, welding, shot blasting, and painting. The heat treatment process often adopts intermediate frequency furnace quenching treatment to improve the hardness and wear resistance of the chain.