... ZJ30/1700L, ZJ40/2250L, ZJ50/3150L, ZJ70/4500L.DC electrical drilling rig includes ZJ40/2250D, ZJ50/3150D, ZJ70/4500D.AC ... authorized.4. Technical Parameters of this drill rig: Drilling rig modelZJ50/3150DBNominal drilling depth m114mm (4 1/2”) Drill pipe3500 ... , m/s0-1.258SpeedⅠ, smooth changeTraveling line12Drive modeIndependent electric driveDrill line diameter, mm35MastTypeKMax. pull of fast line, ...