The system consists of four conveyor belts, which are driven by four motors respectively. When the system is started, the last conveyor belt is started first, and after a delay of 1s, other conveyors are started in turn. When stopping, stop the front conveyor belt first, and then stop the other conveyor belts in turn after the materials are sent out.
When a conveyor belt breaks down, the conveyor belt and the conveyor belt in front of it stop immediately, while the conveyor belt behind it stops until the materials are transported out.
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The design background of the four-section conveyor belt is1in the middle of the 7th century, the United States began to use aerial ropeways to transport bulk materials; /kloc-In the mid-9th century, various modern conveyor belts appeared one after another.
Belt conveyor equipment 1868, belt conveyor appeared in Britain; 1887, screw conveyor appeared in the United States; 1905, steel belt conveyor appeared in Switzerland;
1906, inertial conveyors appeared in Britain and Germany. Since then, influenced by the technology of machinery manufacturing, motor, chemical industry, metallurgy and other industries, the conveyor belt has been continuously improved, and gradually developed from completing the transmission in the workshop to completing the material handling within enterprises, between enterprises and even between cities, which has become an indispensable part of the mechanization and automation of the material handling system.
PLC is developed from the early relay logic control system. Since the advent of 1836 relay, people began to skillfully connect it with switching devices with wires to form logic or sequence control for different purposes. At the end of 1960s, the computer technology was continuously absorbed to enhance its functions and gradually adapted to complex control tasks.
With the rapid development of microelectronics, computer technology and data communication technology, the emergence of microprocessors, and the rapid and frequent changes in the production process in the process processing industry (such as automobile manufacturing), PLC technology came into being and developed rapidly. At present, PLC has made a qualitative leap in miniaturization, large-scale, large-capacity and strong functions, with functions such as logical judgment, timing, counting, memory, arithmetic operation and data.