Small-bending-radius low-standing-wave-ratio 90-degree waveguide elbow suitable for machining

The utility model discloses a small-bending-radius low-standing-wave-ratio 90-degree waveguide elbow suitable for machining, which is applied to the field of radar antennas. According to the utility model, the rotating cylinder is rotated to drive the connecting rod to move, the connecting rod moves to drive the clamping head to move, the clamping head moves to enable the clamping head to be separated from the inner wall of the waveguide elbow, and then the fixed head is taken down for replacement, so that the purpose of replacing the connector can be achieved, and the use cost is reduced; a sliding cylinder is moved, the sliding cylinder moves to drive a triangular groove to move, the triangular groove moves to enable a clamping rod to be disengaged from the waveguide tube under the action of a third spring, then the clamping rod is taken down, and when disassembly and assembly are completed, the waveguide tube is placed into a fixing head, the sliding cylinder is loosened, and the waveguide tube is fixed; a