We are specializing in manufacturing dumbwaiters and their parts since we set up in 1997,our dumbwaiters and traction machines have been exported to many countries ,such as thailand,malaysia,singapore. Our traction machine is driven by international advanced ZC type circular envelope worm, good in lubricity,low in power waste,high in drive efficiency,which is higher 20%than ZA,ZN,ZI,ZK type,gear is small in contact stress,high in strength,large in carrying capacity,which is as twice as ZA,ZN,ZI,ZK type,what's more,it is smooth in movement and low in noise.