Automatic unloading device capable of preventing hydraulic bracket from self-descending

The utility model provides an automatic unloading device capable of preventing a hydraulic bracket from self-descending, belonging to the technical field of underground supporting equipment used in coal mines. The automatic unloading device is used for reducing the pressure of a main liquid return system of the hydraulic bracket, so that the hydraulic bracket avoids the self-descending accident due to excessively high pressure of the main liquid return system, thus ensuring the safe and stable running of the hydraulic bracket on the working surface. The technical scheme is as follows: the automatic unloading device consists of a tee joint, a valve and an unloading valve; one end of the tee joint is connected with the output end of a rear end valve of the main liquid return pipeline; and the other two ends of the tee joint are connected with the valve and the unloading valve respectively. By adopting the automatic unloading device capable of preventing hydraulic bracket from self-descending, when the pressure