The working principle of vacuum suction cups. First, connect the vacuum suction cup to the vacuum equipment through the takeover, and then contact with the object to be lifted, such as glass, paper, etc., and start the vacuum equipment to suck, so that negative air pressure is generated in the suction cup, so that the object to be lifted can be sucked firmly, and then the transportation can be started. Things to be promoted. When the object to be lifted is transported to the destination, it is steadily inflated into the vacuum chuck, so that the vacuum chuck changes from negative air pressure to zero or slightly positive air pressure, and the vacuum chuck completes the task of lifting and transporting heavy objects.