Blast hole surrounding rock strength in-situ drilling testing device based on rebound method and using method

The invention discloses a blast hole surrounding rock strength in-situ drilling testing device based on a rebound method and a using method. The device is composed of metal blades, a connecting mechanism, a rebound sensor, a blade sleeve, a ground circular ring, a ground support, a telescopic rod piece and a ground control and data processor. The metal blades are connected with the blade sleeves through connecting mechanisms, and the ground circular ring is connected with the blade sleeves through telescopic rod pieces. When the device works, the blade sleeve is driven by the telescopic rod piece to descend at a constant speed in a drill hole, meanwhile, the metal blades conduct cyclic impact and rebound operation on the hole wall, and the ground control and data processor stores and records the rebound value of each impact. By using the parameters measured by the device, a mathematical model between the rebound value and the blast hole surrounding rock strength can be established, so that the surrounding roc