Adjustable corrosion coupon device for monitoring heat exchanger

The utility model relates to an adjustable corrosion coupon device for monitoring a heat exchanger, which comprises a mounting seat and a main cylinder connected to the bottom end of the mounting seat, an outward extending auxiliary cylinder is slidably connected in the main cylinder, the top end of the main cylinder is rotatably connected with a screw rod penetrating through the mounting seat, and one end of the screw rod penetrating through the mounting seat is provided with a connecting end. The screw rod is connected with and drives the auxiliary cylinder, the outer wall of the main cylinder and the outer wall of the auxiliary cylinder are each provided with hanging piece holes distributed side by side, and the hanging piece holes are connected with locking pieces. Compared with the prior art that a piece hanging device is fixed in structure and cannot be adjusted according to use, the telescopic piece hanging frame is formed by matching the main cylinder and the auxiliary cylinder, the screw drives the a