Displacement calibration device for tire rolling resistance testing machine

The utility model provides a displacement calibration device for a tire rolling resistance testing machine, which comprises two concave magnet fixing blocks, a transverse auxiliary mounting plate, two guide blocks, a longitudinal auxiliary mounting plate and a sliding plate assembly, the transverse auxiliary installation plate, the two guide blocks and the longitudinal auxiliary installation plate form a square frame structure, the two magnet fixing blocks are vertically and fixedly installed at the two ends of the transverse auxiliary installation plate, the sliding plate assembly comprises a sliding plate and a measurement auxiliary block, the sliding plate is inserted into a middle gap of the square frame structure, and the measurement auxiliary block is fixedly installed on the sliding plate. The two sides of the sliding plate are respectively inserted into sliding grooves in the inner sides of the guide blocks in a sliding mode, the guide blocks are provided with jackscrews, the middle of the sliding pla