Application of PLC in asphalt mixing station

The drying heating system of asphalt mixing station mainly includes two parts of drying drum and combustion device, among which the drying drum is mainly to complete the drying and heating device of cold and wet aggregate.
In order to make cold and wet aggregate in a limited period of time, can be very good to complete the preheating, dehydration drying and heating warming three requirements, not only need to make the aggregate evenly distributed in the drum, but also need to provide it with sufficient operating time, so that the asphalt mixing station discharge temperature can meet the requirements.

Generally speaking, the application of PLC in asphalt mixing station has certain application characteristics, on the one hand, the dynamic dose of asphalt mixing station not only has a fast speed of PLV operation Speed, at the same time its scanning cycle is relatively short, basically controlled within 10ms.
On the one hand, its equipment has more control points, often need plc has a relatively large memory and surplus, at the same time has a relatively fast communication speed, its superior screen refresh speed >5 times/s.
On the other hand, the application in asphalt mixing station realizes the expansion of asphalt mixing equipment system, its cost reduction is lower, the performance is relatively high, and the performance and price ratio of the whole machine is improved emphatically.

Generally speaking, plc in the asphalt mixing station commonly used control system is mainly the adoption of Siemens PLC, the current speed is relatively fast, relatively large memory and relatively excellent performance of the equipment is mainly s7-400 equipment, but this equipment has a high price.
Although s7-300 devices have a lower cost, their performance is relatively low.

In the production of asphalt mixing station, which often contains a number of different production links, and often have a very close relationship.
Therefore, if there is a link to the error, then it may affect the final quality of production.
Next, we will make a brief introduction to the impact of the equipment on the production of asphalt mixing station, I hope to help.

In fact, we can see from the production process of the asphalt mixing station that the equipment needs to be used when heating its raw materials.
Therefore, we must ensure that we are in a normal working state for the equipment we use.
Of course, it is also necessary to ensure that the site is reasonable, in order to ensure the use of electricity, voltage stability, the smooth feeding route and so on.

In fact, do a good job in the asphalt mixing station equipment maintenance and management, not only can properly extend the service life of the equipment, but also can more effectively ensure the smooth running of the entire production work, but also for the production enterprises to save costs and improve economic efficiency.

　　The quality of the host debugging is the premise of the production of asphalt mixture, therefore, the debugging of the mixing building is the central task of the whole asphalt mixing station to fully debug the work.
There are several main types of debugging content:

Today, with the rapid development of the Times economy, the modern expressway is gradually booming, while its most commonly used equipment is asphalt mixing equipment, asphalt mixing equipment in the actual control is mainly the control of feed, temperature control, measurement control, finished product control and dust removal control.

As far as s7-300/400 High Performance plc is concerned, not only has the fast running speed, the larger memory and the more communication interface, at the same time the quantification feeder programming is compatible with the STEP7, the program is not used as one-sided modification.

　　(2) ignition so that the oil furnace normal operation, set the temperature 105℃-120℃, so that the heat conduction with dehydratio
r>Heating speed should not be too fast, generally not more than 20 ℃ per hour, when the temperature reached the set temperature after the shutdown, stay for a period of time (depending on the situation) to make the exhaust dehydration, so repeated several times can
br>Two times set the temperature 180℃-200℃, and then ignition, when the temperature rises to the set temperature, and then stay for a period of time, the purpose is to drain a small number of light components in the heat conduction

>
21st century today, the construction of modern engineering is booming at the same time, the complex comprehensive supporting equipment is a lot of investment, its complex process and more independent operating parts, its equipment control system performance related requirements are relatively
.
The application of PLC in asphalt mixing station realizes the whole process control of asphalt mixing station and facilitates the construction of modern engineering construc
.
Therefore, this paper discusses and analyzes the application of PLC in asphalt mixing station, which has certain economic value and practical significance.