The gradient type sound absorption body is also called the gradient type cavity sound absorption device. It is composed of multiple trapezoidal sound absorption panels. The thickness of the upper end and the lower end of the frame of a single sound absorber are reduced in a gradual manner. Trapezoid shape, the front surface of the sound absorber is generally covered with a metal perforated plate. The back of the perforated plate is covered with a layer of fire-resistant non-woven fabric. The cavity after the fire-resistant non-woven fabric is filled with PVF film to wrap the glass wool, and the glass wool layer of the PVF film passes through The support bead on the back is fixed, and the trapezoidal sound-absorbing body is sealed around. The gradual cavity sound absorption device is mainly aimed at reducing the noise of large-scale equipment in the converter station of the power grid, and has a good sound absorption and noise reduction effect!         The company mainly produces gradual sound absorbers. The products have the advantages of good sound absorption performance, simple construction, and high cost performance. They have been widely used in the noise reduction projects of domestic large-scale converter stations.