As a novel c*tor developed by our company according to the demand of the international market, 3ZT dual-spring c*tor adopts a dual-spring straining device. During the working process of the c*tor, the gunnel can automatically kick up when coming across an obstructer and can restore to the original working status after getting over the obstructer. In this way, the gunnel is under protection. The machine has the advantages of convenient row pitch adjustment and easy depth adjustment. The machine is suitable for intertillage ripping operation in corn, cotton, beans and peas fields.