Probe brush with adjustable radian

The utility model relates to a radian-adjustable probe brush, and the probe brush of an electric spark leak detector has various shapes such as a flat brush, an arc-shaped brush, a fan-shaped brush and the like so as to meet the requirements of different detection surfaces. The arc-shaped brush can be used for detecting the pipes, and the arc-shaped brush is fixed in radian, so that the arc-shaped brush can be only used for detecting the pipes with specific pipe diameters. According to the radian-adjustable probe brush, the adjusting nut is rotated to enable the screw rod to pull the elastic plate to deform so as to change the radian, and the radian of the probe brush can be adjusted. The device is characterized in that one end of the screw is sequentially screwed into the adjusting nut, inserted into the arc-shaped plate and then fixedly connected with the other surface of the elastic plate fixedly connected with the bristles, and the other end of the screw is sequentially in screwed connection with the exte