1.Applications ans features-torsion testing machine This impact testing machine combines low temperature test and impact test in one machine. Adopts auto sample feeding device so that sample will be sent to do impact test once low temperature test is finished. This is done within 4 seconds to improve test precision and working efficiency. All the procudures (sample cooling, temperature holding, temperature adjust, raise pendulum, locate pendulum, sample sending, sample locating and impact) are electric auto control After breakage of sample, pendulum will raise with rest energy to prepare for the next test. Its super performance is suitable to the lab doing continuous low temperature impact test and to the metallurgy and engineering works doing large number of low temperature test. 2.Main specifications-torsion testing machine 1 Impact engergy 500J 250J 2 Dial range 0-500J 0-250J 3 Dial division value 5J 2.5J 4 Pendulum moment 0-500J M=267.9492Nm 0-250J M=133.9746Nm 5 Pendulum pre-raising angle 150° 6 Distance between pendulum center to impact point(sample center) 800mm 7 Impact speed 5.4m/s 8 Span of impact specimen support 40mm 9 round corner of nipper jaw R(1.0-1.5)mm 10 round corner of impacting edge R(2.0-2.5)mm 11 Included angle of impact knife 30° 12 impact knife thickness 16mm 13 Measuring range 0-360° 14 angle resolution =0.06° 15 Specimen size 10X10X55mm 16 Sample box capacity 10 17 cooling mode liquid nitrogen refrigeration 18 Temperature range -40~-196 29 temperatuer precision fluctuation±1.5 graded 2 20 Digital timer 1s-999s resolution:1s 21 cooling medium liquid nitrogen 22 sample feeding time =4S 23 Dimension 2230X1510X1480mm 24 Weight 600kg 25 Power and voltage three-phase four-wire system 380V 50Hz 750W