Sub-frame support device

The invention relates to a sub-frame support device. The sub-frame support device is hinged with a middle groove of a reversed loader through pins. A support cylinder is hinged with a base seat and a support beam, wherein the support beam adopts a segmental structure, is hinged by connecting rods, and further adopts a joist steel overall welding structure. A sub-frame top beam is welded in butt welding mode by two joist steels, and reinforcing plates are additionally welded above and below the sub-frame top beam so as to improve overall strength of the top beam. The base seat adopts a steel plate box structure, and is connected with the middle groove of the reversed loader in hinge mode and arranged according to the need that front and rear squeegee machines are matched with the reversed loader. A hydraulic system uses working face high pressure emulsion as a power source, completes lifting of a sub-frame through an operating valve set, a high pressure pipeline, a hydraulic control one-way valve and a lifting