Heavy apron feeder is the auxiliary equipment of transportation machinery, the machine in the crushing and grading workshop of large concentrator and cement, building materials and other departments, as a silo to the primary crusher continuous and uniform feed, can also be used for short distance conveying particle size and large proportion of materials. With the continuous development and growth of mineral processing enterprises, the heavy apron feeder control system, known as the "Throat" Equipment, has also received more attention in the processing crushing operation. In traditional work, the control of heavy apron feeder is mainly adjusted by work experience. However, some staff due to lack of work experience, it is easy to cause the empty of the bin material level, so that the heavy apron feeder bears too much impact load, which greatly shortens the service life of the feeder. It also affects the health of the staff.

Programmable controller is a new type of automatic control device which integrates computer technology, automatic control technology and communication technology. Because it can change the control process through software, and has the characteristics of small size, easy assembly and maintenance, simple programming, high reliability, strong anti-interference ability, etc., it has been widely used in various fields of industrial control, and is one of the three pillars of modern industrial automation. In recent years, with the increasing degree of industrial process automation and the enhancement of people's awareness of environmental protection, the excellent performance of plc technology has been widely used at home and abroad. Plc and mechanical, electrical, electronic, hydraulic and pneumatic knowledge together for the development of industry has brought a great role. Programmable logic controller (plc) is a new type of industrial control device that has developed very rapidly since the 1960s, and its application is more and more extensive. The development and production of china's plc products have experienced three stages: Sequence controller (1973~1979); one processor based industrial controller (1979~1985); 8-bit microprocessor-based programmable controller (since 1985). Driven by the policy of opening up to the outside world, a large number of foreign plc products have entered our market, and some are imported with complete sets of equipment.

Such as baosteel first, second phase of the project has introduced more than 500 sets, now, plc in all walks of life in the country has a great application, the technical content is also getting higher and higher. In the 21st century, plc will have greater development. From the technical point of view, the new achievements of computer technology will be more applied to the design and manufacturing of programmable controllers, there will be faster computing speed, larger storage capacity, and stronger intelligent varieties: From the product scale, it will further develop in the direction of ultra-small and ultra-large; from the point of view of product compatibility, the variety of products will be richer, more complete specifications, perfect human-machine interface, complete communication equipment will better adapt to the needs of various industrial control occasions: From the perspective of the market, the situation of countries producing multi-variety products will be broken with the intensification of international competition, there will be a few brands monopolizing the international market situation, there will be an international common programming language; from the development of the network, programmable controller and other industrial control computer network to form a large control system is the development direction of programmable controller technology. The current apron feeder computer distributed control system (dcs) has a large number of programmable controller applications. With the development of computer network, programmable controller, as an important part of the automatic control network and the international general network, will play an increasingly important role in many fields of industry and beyond.