1. Single-machine manual control stage
The stacker control system in the 1960s and 1970s was composed of separate relays, contactors and multi-core traditional cables. The position detection control switch of the organization was also in the early stage of development, and only the ones with simple functions were selected. Mechanical switches have extremely low detection accuracy and protection level. In the cab of the stacker, the operator can independently operate a single piece of equipment on site, and cannot complete the complex interlocking function of the system. The communication function between the stacker and the ground control center is accomplished by the connection of the relay contacts through the multi-core traditional cable; the monitoring function of the system to the equipment is accomplished by the traditional analog instrument panel. In this way, the operators in the main control room of the transmission system do not know the operating conditions of the field equipment and the operating parameters of the equipment, and there are no equipment alarm signals and related data in the control room, and the transmission of information is also manual. In actual industrial production, such a system not only has cluttered lines, huge volume, low degree of automation, poor operability and stability, and all are manually operated.
2. Semi-automatic control stage
In the late 1970s, the use of programmable control (PLC) master-slave station skills and terminal display applications for the stacker greatly reduced the central relay and the cables used for control, and the monitoring of the machine's running status was also improved. In the PLC control system, the control program compiled by the user expresses the technological requirements of the production process, and is stored in the user program memory of the PLC in advance. During operation, the contents of the stored program are executed one by one to complete the operations required by the technological process. However, after all, PLC is an electronic device that can only simply control the production process. It can only perform simple data exchange with other devices. It is difficult to achieve complex intelligent control and large-scale management, and it lacks good human-computer interaction. For the sake of safety and convenience, most of the existing stacker control systems still use a combination of manual control and PLC semi-automatic control.
3. Automatic control stage
In order to meet the requirements of highly automated production of large-scale ore, coal, ports, etc., improve operating efficiency, and ensure the stability and continuity of the system. Automatic control refers to automation, intelligence, modernization of communication and management skills. Automatic control means that the stacker completes unmanned control and supervises the status of the stacker operation through the monitoring system. For example, the process operation control of stacking ore powder in the stacker should be automatically controlled under a specific system control. Sitting in the control room, the operator can switch between the screens of the computer screen to understand the various parameters of the stacker, the orientation of the cart, the operation of various components and systems such as the auxiliary system, and set the operation parameters of the stacker. , and understand the operation status and failure cause of the stacker in real time through the automatic system, and can automatically record the failure information, etc.
