Leeb hardness tester for back-up roll production detection

The invention provides a Leeb hardness tester for back-up roll production detection, and relates to the technical field of Leeb hardness detection. The Leeb hardness tester for back-up roll productiondetection comprises a cylindrical shell, a detection ring is fixedly connected to the position, close to the bottom end, of the side face of the cylindrical shell, a threaded opening is formed in thetop of the cylindrical shell, an upper threaded cover is in threaded connection with the interior of the threaded opening, a stress application spring is fixedly connected to the bottom end of the upper threaded cover, the bottom end of the stress application spring is fixedly connected with a lower end block, a magnetic attraction plate is arranged at the bottom end of the lower end block, and aside face sliding hole is formed in the side face of the cylindrical shell. The magnetic attraction plate is adopted to attract a detection rod, then the stress application spring is compressed through a threaded structure arr