Coupling device of low-mass iron block for Leeb hardness measurement

The utility model discloses a coupling device of a low-mass iron block for Leeb hardness measurement. The coupling device comprises a rotating disc, a main shaft, threads, a main shaft threaded hole, a pressure spring, a sliding shaft, a bearing, a pressure block, a base and a bracket, wherein the base is horizontally placed, the bracket is vertically placed, the main shaft threaded hole is formed in a horizontal turn extending part at the upper end of the bracket, the main shaft penetrates through the main shaft threaded hole, and threads are formed in the periphery of the main shaft; the rotating disc is arranged at the upper end of the main shaft and is used for screwing the main shaft in or out; the lower part of the main shaft threaded hole is a hollow circular pipe structure, and the sliding shaft is arranged in the hollow circular pipe structure and is marked with engraved with marks; the pressure spring is arranged above the sliding shaft, the pressure block is arranged under the sliding shaft, and the sliding shaft and the pressure block are connected through the bearing. The coupling device is relatively high in pressure precision, small in size, simple and reasonable in structure, large in pressure range, small in failure probability and high in reliability and can adapt to a heated coupling environment.