Main Features 1.Mechanical transmission 2.Power: diesel engine+ decelerator 3.Speeds in gearbox become 4 forward +1reverse by gear transmission 4.Output shaft of gearbox transmit the power to drawworks by chain 5.Reasonable distribution of gears, high use ratio of power 6.ZP175 rotary table 7.Gear-shift of gearbox is controlled by pneumatic system Main Technical Parameters Model ZJ20/1350 ZJ20/1350DJ ZJ20/1350DZ ZJ20/1350DB Drilling depth （114mm drill pipe） 2000m 2000m 2000m 2000m Max. hook load 1350kN 1350kN 1350kN 1350KN Traveling system structure 4×5 4×5 4×5 4×5 Fast line diameter φ29mm φ29mm φ29mm φ29mm Max. pull of fast line 170 kN 170kN 200 kN 200kN Power of drawworks 400KW 400KW 400KW 400KW Speed of drawworks 4F+ 1R 4F 2F,Stepless speed regulation 2F，Stepless speed regulation Input power of rotary table 200 kW 200 kW 200 kW 200 kW Mast JJ135/41-K JJ135/41-K JJ135/41-K JJ135/41-K Substructure DZ135/2.8-K DZ135/4.5-K DZ135/4.5-K DZ135/3.8-K