Petal type cardan shaft of screw drill

The utility model belongs to the field of cardan shafts, particularly relates to a petal-type cardan shaft of a screw drill, and provides the following scheme aiming at the problems that the overall size of an existing petal-type cardan shaft is fixed, the use size is difficult to adjust flexibly, and different use requirements are difficult to meet after working environments are switched. The device comprises a connecting base, two petal-type connecting rods, two petal-type connectors, an adjusting assembly and two mounting assemblies, adjusting grooves are formed in the two sides of the connecting base, the petal-type connecting rods are slidably mounted in the corresponding adjusting grooves, the petal-type connectors are mounted on the corresponding petal-type connecting rods, and the petal-type connectors are mounted on the petal-type connecting rods. And the mounting assemblies are arranged on the corresponding petal type connecting rods. According to the petal type universal shaft, the overall size is