... joint abrasion to prolong the barrier gate working life.4. Thimble type motor worm design for preventing plugging ... design.6. Double limit methods (electronic limit and motor sensor memory limit) for beam rises and falls. ... ,Turnstile Gate,Drom Arm Turnstile,Electric Barrier,Access Gate,Security Gate,Access Control System,RFID,Long Range Reader system,Electric folding Gate,Automatic Folding Gate