Linking the piston by a connecting rod to a crankshaft causes the gas to rotate the shaft through half a turn.
活塞通过连杆和轴连接，使得气体带动轴旋转半圈。
2
With the upgraded locking device the axial force of the screw rod is reduced by half when roiling, Which makes the drum locked more reliably.
轧制时丝杆轴向受力减小一半，使转鼓被锁紧得更可靠。
3
The principle and method for quarto-rod can be analyzed as a device simply through rotation of the half Angle so as to find the central and circular points.