(1) automatically arrange the plastic caps and butyl rubber stoppers properly in proper direction with the vibrating disk, convey them to the assembly station, and the assembly cam will suck the butyl rubber stoppers through vacuuming and insert them into the plastic caps for assembly purpose; (2) feed simultaneously on two rails, making the assembly efficiency high, and the built-in detection function will ensure the qualification rate of assembled products; (3) it is equipped with automatic no-material alarm device, with speed and variable frequency adjustable; (4) customize upper-insert cap or lower-insert cap assembling machine as required by the customer