The Coal Mine Scraper Conveyor is an important bulk material handling equipment widely used in coal mines, chemical mines, metal mines, power plants, and other fields. Below is a detailed introduction to the scraper conveyor:

Definition and Classification

Definition: A scraper conveyor is a type of conveyor that uses a scraper chain for traction to transport bulk materials within a trough. It utilizes a flexible body as the traction mechanism and operates continuously.

Classification: Based on the arrangement and structure of the troughs, they can be divided into parallel and overlapping types. According to the number and arrangement of chains, they are classified into single-chain, twin-side-chain, twin-center-chain, and triple-chain types. Additionally, there are various other types, such as flexible (or bendable) scraper conveyors and high-temperature resistant scraper conveyors.

Working Principle

The working principle of the scraper conveyor involves using an open trough as the load-bearing element for coal, gangue, or other materials. Scrapers are fixed to chains (forming the scraper chain), which act as the traction component. When the head drive unit starts, it rotates the sprocket on the head shaft, causing the scraper chain to cycle. This movement carries the material along the trough until it is discharged at the head end. The scraper chain moves in an endless closed loop around the sprockets, thereby completing the material transport.

Structure and Components

The scraper conveyor is mainly composed of three parts: the head section, the intermediate section, and the tail section. Additionally, it includes auxiliary components such as hydraulic jacking devices for pushing the conveyor and chain tensioners for tightening the chain.

- Head Section: Consists of the head frame, electric motor, fluid coupling (or coupling), reducer, and sprocket, among other parts.

- Intermediate Section: Comprises the transition trough, middle troughs, chains, and scrapers. This is the critical component of the conveyor. The middle troughs form the main body, responsible for conveying coal, bearing the weight of the shearer, and withstanding the pushing forces from hydraulic roof supports.

- Tail Section: Provides the return path for the scraper chain. In heavy-duty scraper conveyors, the tail section, like the head, is also equipped with a power transmission device.

Product Advantages

1.  Robust Structure: Withstands external forces such as impact, collision, pounding, and pressure from coal, gangue, or other materials.

2.  High Adaptability: Can adapt to uneven floor conditions and the need for curved advancement in longwall faces, tolerating bending in both vertical and horizontal directions.

3.  Low Profile: Facilitates easy installation.

4.  Dual Function: Can also serve as a track for the shearer.

5.  Reversible Operation: Allows for reverse operation, which is convenient for handling bottom chain incidents.

6.  Simple Structure: Enables loading or unloading at any point along the conveying length.

7.  Enclosed Casing: Helps prevent dust pollution during material transport.