Device for detecting centering of milling head cutter and workbench of large gear milling machine

A device for detecting centering of a milling head cutter and a workbench of a large gear milling machine comprises two reference seats, a cross rod, a positioning plate and a laser distance measuring device, the two ends of the cross rod are placed on the two reference seats respectively, the positioning plate and the laser distance measuring device are installed on the cross rod, the positioning plate perpendicularly extends out of the cross rod by a certain distance, and the laser distance measuring device is installed on the cross rod. And the laser distance measuring device is used for measuring the distance between the cross rod and the mandrel in a using state by taking the cross rod as a reference. The two reference seats are used for supporting and placing the cross rod, firstly, the distance and parallelism between the cross rod and the mandrel are controlled through the positioning plate, after the workbench rotates by 180 degrees, the distance between the cross rod and the mandrel is measured agai