（立棍开关）皮带跑偏开关

p1Src=//y3.yzimgs.com/uploads_old/440717/2015072816265440_old.jpg&p2Src=//y3.yzimgs.com/uploads_old/440717/2015072816265457_old.jpg&p3Src=//y3.yzimgs.com/uploads_old/440717/2015072816265482_old.jpg"

aa