The technology of screw conveyor in foreign countries has developed rapidly, mainly in two aspects: on the one hand, the functions of screw conveyor are diversified and the application scope is expanded, such as belt conveyor with large inclination angle, tubular screw conveyor and space turning screw conveyor; On the other hand, the technology and equipment of screw conveyor itself have developed greatly, especially the large-scale screw conveyor with long distance, large capacity and high belt speed has become the main development direction. Its core technology is the development and application of dynamic analysis and monitoring technology of screw conveyor, which improves the running performance and reliability of screw conveyor. At present, the screw conveyor used in coal mine has reached the main technical indexes shown in table 1, and its key technologies and equipment have the following characteristics:

(1) Large equipment. Its main technical parameters and equipment are developing to a large scale to meet the needs of high-yield, high-efficiency and intensive production with an annual output of more than 3 million to 5 million tons.

⑵ High-tech technologies such as dynamic analysis technology, mechatronics and computer monitoring are applied, and high-power soft start and automatic tension technology are adopted. The dynamic tension of the conveyor belt is greatly reduced, and the equipment has good running performance and high transportation efficiency.

⑶ Using multi-machine drive, intermediate drive and power balance technology, changing the direction of the conveyor theoretically limits the running length of a single conveyor, ensuring the universality and interchangeability of the conveying system equipment and the reliability of the unit drive.

⑷ New high reliability key component technology. For example, various advanced high-power driving devices and speed regulating devices include CST, long-life high-speed idler, self-cleaning roller device, high-efficiency tape storage device, fast self-tailing, etc. For example, FSW 1200/(2~3)×400(600) working face anticorrosion screw conveyor produced by FSW in the UK adopts liquid viscosity differential or frequency conversion speed regulating device, and the conveying capacity is over 3,000 t/h, and the tail is equipped with a new loader, which can automatically move quickly with the passing of the working face, with less labor and high production efficiency.

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