In the last issue of《Dimensional classroom》Li，Xiaowei explained the vibration compaction technology of Hummer.#1 Working principle，Current period《Dimensional classroom》Xiaowei will take you to learn about Hummer vibration compaction technology.#2 Rolling speed setting。

It is well known，Pavement compaction effect affected by rolling speed、Influence of vibration frequency and compaction times on these parameters，These three parameters are complementary to each other.。The rolling speed is determined by the vibration frequency and the impact spacing.。Generally speaking，The ideal impact spacing is 2.54 cm，Too large or too small impact spacing will affect the quality of pavement compaction.。

The new generation of Hummer HD Series double-drum rollers can display the number of impacts per foot in real time through the operation screen during compaction.，The vertical bars on both sides represent the front and rear steel wheels respectively，The ideal value is about 13.。Therefore, the operator can refer to this display value to set a reasonable rolling speed.，That is to say, by adjusting the rolling speed, the number of impacts is about 13.。

Of course, the rolling speed can also be adjusted for asphalt mixtures with different gradations.，It is best to keep the number of impacts at 10-Between 16。A new generation of Hummer HD Take the series model as an example, The dither is set to 60 Hz, According to the rolling effect of different types of asphalt mixture，It is recommended to set the rolling speed at 4.5-7.2 km/h。For the specific operation and parameter setting method, please click the video to listen to the training teacher's detailed explanation.。

《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.。