TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: Each of four sides of the feed chute is in the shape of an inverted V-shaped trapezoid, and has a large upper end, a small lower end, and a slender and square-shaped opening. When the rotating rod of the feed chute controller rotates by 90 degrees , then the outlet of the feed chute completely opens, and when the rotating rod of the feed chute controller rotates by 0 degrees , then the outlet of the feed chute completely closes with an angle between 0 degrees and 90 degrees indicating that the machine is in an operating mode, and the flow increases gradually. The atomizing chamber is spaced 3-20 cm apart from the outlet of the feed chute. The atomizing chamber comprises an inlet, an upper cover, a nozzle, a nozzle valve, gauze, a gauze fixing frame, a gauze adjusting screw, a gauze fixing groove, a liquid returning tank, a bottom plate and an outlet. The upper cover is a movable cover, which is capable of opening towards two ends and carrying out internal regulation, control and operation. The bottom plate is inclined by the angle of 5-25 degrees relative to the horizontal plane, and is high close the outlet of the atomizing chamber, and low close to the returning tank. The returning tank is arranged at the bottom of the atomizing chamber, and opens at the return pipe. The liquid inlet pipe is divided into two outer parts to enter the atomizing chamber, where each liquid inlet pipe is equipped with 2-20 bacterial liquid nozzles. The number of bacterial liquid nozzles is specified according to the size of the bacterial liquid coating machine. Each bacterial liquid nozzle is equipped with an adjusting valve. The bacterial liquid nozzle is arranged downwards by an angle of 0-40 degrees . The two sets of gauzes are arranged under the bacterial liquid nozzles on two sides inside the atomizing chamber and on the bottom plate of the atomizing chamber, and have the same structure. The gauze has 30-300 meshes, and is fixed on the gauze fixing frame. The inner side of each of the two ends of the gauze fixing frame is equipped with a rotary gauze adjusting screw, which is capable of rotating up and down to adjust the angle between the gauze and the bacterial liquid nozzle. The bottom plate is opened with the gauze fixing groove, which is capable of fixing the gauze and preventing slips. The air drying box comprises an inner wall and an outer wall. The inner wall is hollow, and the outer wall is arranged in a closed or semi-closed manner.