Patent ID: 8047821

Claim:
A ring rack oil pumping machine comprising: a base ( 1 ), a frame ( 27 ) mounted on the base ( 1 ) and a roller ( 23 ) mounted at the top of the frame ( 27 ); a sprocket case ( 12 ) is connected to the middle of the frame ( 27 ), a input shaft ( 9 ) having a lower sprocket ( 11 ) and a drive shaft ( 14 having an upper sprocket ( 13 ) are installed at the bottom and top of the sprocket case ( 12 ) respectively, the upper sprocket ( 13 ) and lower sprocket ( 11 ) are connected by a chain ( 24 ); a guide wheel ( 19 ), track gear ( 18 ) and centralizer wheel ( 17 ) are mounted in sequence on the end of the drive shaft ( 14 ) extended out of the sprocket case ( 12 ); the track gear ( 18 ) meshes with a rack ( 16 ), a slide rail ( 20 ) is mounted with the frame, and a sliding base ( 21 ) connected with the slide rail ( 20 ) moveably.