Detection device

The utility model discloses a detection device. The detection device is used for detecting the displacement compensation mechanism, the displacement compensation mechanism comprises an outer ring andan inner ring connected with the outer ring, one of the outer ring and the inner ring is movably arranged relative to the other one, and the detection device comprises a first support, a tension and compression sensor, a hydraulic cylinder, a displacement sensor and a controller; the tension-compression sensor is connected with the inner ring; a hydraulic cylinder shaft of the hydraulic cylinder is connected with the tension-compression sensor, and the hydraulic cylinder is used for applying acting force to the tension-compression sensor to enable the inner ring to move; the displacement sensor is arranged on the first bracket; the controller is electrically connected with the displacement sensor and the tension-compression sensor so as to acquire first information representing movement ofthe inner ring through th