Mechanical 4-segament extension arm mechanism for window wipping machine

The utility model relates to a mechanical four-section telescopic boom mechanism for window clean machines belonging to the technical field of cleaning equipments. The utility model comprises a speed reduction motor, a gear rack, a plurality of drive chains, a plurality of head sprockets, a plurality of tail sprocket, a basic jib, a second jib, a third jib, and a fourth jib; the connection relations are that: the speed reduction motor is arranged at the bottom of the front end of the basic jib, the gear rack is arranged at the bottom of the second jib, the head sprockets and the tail sprockets are arranged respectively at the front ends and back ends of the tops of the second jib and the third jib, a plurality of the drive chain adjusting bearers are arranged at the heads and the middle parts of the basic jib and the second jib, a plurality of drive chain fixed bases are arranged at the middle parts and the tails of the third jib and the fourth jib; thereby, the separate jibs are connected in series into an integral continuous action body by the drive chains. The utility model makes the maximum length of the work arm of the window clean machine extends as long as 30 meters, the reliability and the durability are also improved, meanwhile the cost is lower and the maintenance is more convenient.