The invention discloses a dragging power
system for a lift. The dragging power
system comprises dragging machines mounted in a liftway, a dragging steel
wire rope, and counter weights arranged below the dragging machines, and is characterized in that one end of the dragging steel
wire rope is fixed to a casing of one dragging
machine, the other end of the dragging steel
wire rope is fixed to the inner wall of the liftway, and the middle part of the dragging steel wire
rope sequentially winds counter-weight wheels on the counter weights, driving wheels on the dragging machines and guide wheels at the bottom of a lift car; a pretightening mechanism is arranged on the outer side wall of the lift car, and used for tightening the dragging steel wire
rope when the counter weights and the lift car do not apply an acting force on the dragging steel wire
rope. According to the provided dragging power
system for the lift, in the lift maintenance process, when the lift car and the counter weights do not apply an acting force on the dragging steel wire rope, the condition that the dragging steel wire rope is not loosed from the guide wheels can be ensured, and the risk that the dragging steel wire rope is loosed from the guide wheels can be avoided.