... H(L)-100-M(B/I/M)-J-C)JW series spiral elevator features:1. JWM type ( ... large load, speed and without frequent the workplace. 3, keep truck: trapezoid screw with automatic locking function, ... greatly improved, can relaxed and high speed operation. 3, long service life: using high quality ball screw, ... make its working life is raised more than 3 times.Note: itself without locking function to add ...