Sequential control of the crushing process
The continuity of the crushing operation requires a certain order of operation between the start and stop of each equipment, otherwise it will cause the crusher to clog and interrupt production, and even cause serious equipment accidents. Therefore, in order to control the equipment between the crushing operations, a corresponding logic control system is designed. It can use logic control systems composed of logic devices such as relays, magnetic components, and semiconductors. However, due to the shortcomings of such logic devices, such as low anti-interference ability, poor stability, and easy damage, they are gradually replaced by more reliable controllers such as programmable controllers. The programmable controller overcomes the shortcomings of the above logic devices, and is flexible and convenient to operate and reliable in operation. For different applications, no major changes are required in the hardware, mainly to modify the programming software, which is very convenient to use. The sequence controller should meet the following requirements:
(1) Each piece of equipment must be started at a certain time interval in the order specified by the process. The starting sequence is opposite to the running direction of the ore material, and the crusher is usually started first.
(2) Each device can be started separately or in groups.
(3) When the production of the crushing is stopped, the order of stopping is opposite to the order of starting.
(4) When a certain equipment in the crushing system is forced to stop, in order to avoid problems such as blockage, all other equipment supplying the equipment and mineral materials must also stop, but its subsequent equipment can not stop.
(5) In order to improve the on-site environment, the dust removal equipment is first started, and when the system is parked, it is necessary to stop at the end.
The automatic control of the mine-distributing trolley is to distribute the qualified products of the belt conveyor to the grinding powder ore bin to the various mine bins. In order to prevent the ore from being segregated in the mine, and to ensure uniformity of the ore-feeding grain size, it is usually controlled automatically according to the timing and order of the number of powder mines. This system is part of a sequential control system.
Interlocking control of other equipment, such as the ore mine ore level to the minimum, in order to retain a small amount of ore to protect the mining machine, from the direct collision of ore, should stop mining to the mine.
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