In the last issue of《Dimensional classroom》Li，Xiaowei brings you the maintenance skills of the engine of the fourth national two-meter milling machine.#1，Current period《Dimensional classroom》Xiaowei will answer your questions.：Increase the thickness of the new high-speed pavement、New municipal roads and expressways、New materials such as modified special asphalt materials are widely used in highways of various grades.，Under the new situation of construction such as narrower compaction time window，Why rollers with higher vibration frequencies---New generation of Hummer double steel wheel HD 138i/HD 148i Is it a better choice to meet these new construction needs?？Click on the video below.，Let's find out。

Why roller with higher vibration frequency function，Will there be better performance in compaction efficiency and compaction effect?？This starts with the principle of vibratory compaction.。The vibration shock wave produced by the roller can make the aggregates with different particle sizes move.，In the course of motion，Aggregates with large, medium and small particle sizes and fine sand fill the gaps with each other.，A very compact material structure is obtained.，Finally, the air and water between the aggregates are emptied by the compaction of the roller.。

According to the principle of mechanics，Only when the generated vibration frequency is in resonance with the inherent vibration frequency of the material，The material's athletic ability is the most powerful.，Therefore, when the vibration frequency generated by the roller resonates with the paving material,，In order to get the ideal compaction effect.。

Compared with traditional roller，New generation of Hummer double steel wheel HD 138i/HD 148i Frequency from 25-60 Hz Adjustable, Can be suitable for compaction of various material。Not only that，Optimized 60 Hz High frequency vibration system，Less impact clearance during compaction，Therefore, it has the ability of high-speed compaction.，While still ensuring flatness，The compaction speed for the intermediate and upper layers can be increased to 5-5.5 km/h。

In addition，This feature is constructed in autumn and winter.，Ambient temperature is low，Under the condition that the material temperature drops faster per unit time，Its advantages in compaction quality will be more prominent.，At the same time, the high compaction efficiency can also save a lot of labor.、Fuel and other expenses。

《Dimensional classroom》It is a video column produced by Wittgen China Technology and Training Center to introduce equipment operation and precautions.，Launch on a regular basis，I hope you will continue to pay attention.。In addition，If you have any questions you want to know, you can also send us a bullet screen or leave a message.。