Four-post supporting secured low-roof coal bracket

The utility model discloses a four-column supporting and shielding type low order roof caving coal supporting frame, which comprises four supporting hydraulic telescopic vertical columns arranged on a base seat. The top ends of the four supporting hydraulic telescopic vertical columns are respectively hinged with a top beam; a front telescopic beam is hinged at the front end of the top beam; a sidewall protecting plate is hinged at the front end of the front telescopic beam, a sidewall protecting jack is arranged on the front telescopic beam, and the top rod of the sidewall protecting jack is hinged with the rear part of the sidewall protecting plate; the rear part of the top beam is hinged with the upper part of a shielding beam; the lower part of the shielding beam is hinged with the base seat through a positive four connecting rod; a tail beam with a box-shaped structure is hinged at the lower part of the shielding beam, and a tail beam jack is arranged between the lower part of the tail beam and the lower