The problem existing on ball mills after long-term operation

i.e.severe abrasion on single side of the large gear wheel

making the engagement between gear wheels to be worsened

and the vibration of driving parts to be increased

has been analysed.After implementation of retrofitting the large gear wheel by adopting the reverse rotation technology

the non-working surface on large and small gear wheels has turned into working surface

the engagement between gear wheels being perfected

stressed direction of small gear wheel at B side has been changed

the transmission being stable.The application of reverse rotation technology has greatly prolonged the service life of said large gear wheel.