Cable-stayed chuck with built-in oil cylinder

The utility model discloses a cable-stayed chuck with a built-in oil cylinder, and belongs to the technical field of clamping chucks. The device comprises a cylinder body and a front cover, the front cover is slidably sleeved with a plurality of diagonal draw bars, the diagonal draw bars are annularly and evenly distributed along the center of the front cover, the bottoms of the diagonal draw bars extend into the cylinder body, a transmission part driven by an oil cylinder to ascend and descend is arranged in the cylinder body, the transmission part is connected with the bottoms of the diagonal draw bars in a clamped mode, and the transmission part is connected with the cylinder body. The tops of the diagonal draw bars extend to the position above the front cover and are fixedly connected with a pressing plate. Through the arrangement of the diagonal draw bar, the oil cylinder drives the pressing plate to press downwards through the diagonal draw bar, clamping is carried out on the positioning supporting seat