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 equipment must be started in sequence at a certain time interval in the order specified by the process. The starting sequence is opposite to the running direction of the mineral material.
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.
For example, the three-stage fracture shown in Figure 5-2-1
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.
The use of molds has a life span. When the use of a pair of molds exceeds its life span, the molds should be replaced in time, so the mold production process has certain repeatability.
Milling, boring, drilling, reaming, tapping and other processes are also used in regular mold processing.
The main material of the mould is high-quality alloy steel. Some moulds with a long service life are often made of Crl2, CrWMn and other ledeburite steels. The production and processing of this material is very strict, so the processing process cannot be ignored. The thermal deformation treatment is also an aspect that needs to be taken seriously in the processing. To sum up, when selecting the airport, the processing conditions should be met as much as possible, such as strong functionality, high accuracy of machine tool, good rigidity, good thermal stability, and anti-type function.
Some surface shapes are composed of multiple curved surfaces, such as automobile cover parts, aircraft, parts, toys, household appliances, etc., so the surface of the mold cavity is very easy to be complicated, and some can be processed through mathematical calculation.
Some molds have neither drawings nor data in the production process, and can only be imitated through physical objects, which requires high imitation accuracy and no deformation.
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