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With squeegee chain traction, the conveyor that transports the bulk material in the tank is called a scraper conveyor. In the current coal mining face, the role of scraper conveyor is not only to transport coal and materials but also operating the track of the coal mining machine, so it has become indispensable main equipment in the modern coal mining technology. The scraper conveyor can keep running continuously and production can be performed normally. Otherwise, the entire coal mining face will show a state of discontinued production and disrupt the entire production.
The main structure and components of various types of scraper conveyors are basically the same, it consists of three parts: nose, middle and tail. In addition, there are auxiliary components such as a hydraulic jack device for moving the conveyor and a chain tensioner for tightening the chain. The head of the machine is composed of the headstock, electric motor, fluid coupling, reducer and sprocket. The middle part consists of transition slots, middle slots, chains, and scrapers. The tail is the device for the scraper chain return. Like the nose, the tail end of the heavy-duty scraper conveyor is also provided with a power transmission device to distinguish the upper head from the lower head from the installed position.
According to the arrangement and structure of the conveyor chute, it can be divided into two types: parallel chain and overlapping type. According to the number of chain and arrangement, it can be divided into single chain, double chain, double center chain and three chains.
The working principle of the scraper conveyor is that the open chute is used as a bearing member for coal, vermiculite, or materials, and the scraper is fixed on the chain as a traction member. When the head drive section is started, the sprocket on the motive head shaft rotates, causing the scraper chain to cycle and move the material along the chute until the head of the machine is unloaded. The scraper chain bypasses the sprocket for strapless, closed-loop operation to complete the material transfer.