When the eccentric disc rotates in the positive direction, the support rod is driven to rotate upwards so as to lift weight.
偏心盘作反方向偏心旋转时支撑杆随偏心盘作向下方向旋转，使举重器下降复位。
2
Plunger pistons which are arranged in the horizontal direction are pushed by eccentric wheels on the output shafts of motors which are arranged in the vertical direction to work.