Sliding block raceway opening dimension detection device

The utility model particularly relates to a slide block raceway opening dimension detection device. The device comprises a measurement body, a cover plate, a fixed measuring head, a movable measuring head, an equivalent lever, a locking nut, a rotating shaft, a driving lever, a driving sheet, a small rotating shaft, a flange sleeve, a spring, a fixed seat, a torsion spring, a handle, a main shaft, a dial indicator and a benchmarking body. One end of the equivalent lever is contacted with the right end of the movable measuring head, and the other end of the equivalent lever is contacted with a dial indicator measuring head; the torsion spring exerts force on the driving lever on the fixing seat, one end of the driving lever penetrates through the rotating shaft to be in contact with the locking nut of the movable measuring head, the other end of the driving lever penetrates through the head of the driving piece on the cover plate, and the driving piece can rotate around the small rotating shaft fixed on the co