The word "rollover" is familiar to everyone. In what dynasty did it first appear?

Rollover first appeared in the Eastern Han Dynasty. The inventor of the rollover was Bi Lan (? —189), eunuch of the Eastern Han Dynasty, one of the ten regular attendants.

rollover is also known as keel waterwheel, which was used by China folk to irrigate farmland in the old days. It is the earliest and oldest agricultural waterwheel in the world.

is a scraper type continuous water lifting machine, and it is one of the most famous agricultural irrigation machines invented by working people in ancient China. In Cao Wei's time, the reformed rollover was used for irrigation.

In the Book of the Later Han Dynasty, Bi Lan made a rollover, and Ma Jun of the Three Kingdoms improved it.

Extended information:

Rollover can be driven by hand, foot, cow, water or wind. The keel blade is used as a chain, lying in a rectangular long slot, and the body is tilted by the river or pond.

the lower sprocket and a part of the car body are submerged. When the sprocket is driven, the blade will be wiped up along the groove and send water out to the upper end of the long groove.

With this continuous circulation, water can be transported to the required place, and water can be taken continuously, with greatly improved efficacy and convenient operation and transportation, and the water intake point can be transferred in time for irrigation and drainage. The earliest application of ancient chain drive in China was on rollover, which was a major improvement of agricultural irrigation machinery.

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