During the operation of the printing machine, the printing pattern of the fabric is directly captured by the camera, and the color of the fabric is analyzed by using image processing and analysis technology to detect the accuracy of the color position of the register folded plate muffler. The adjustment control signal is provided to the printing drum control system, which adjusts the position of each printing cylinder with respect to the color position of the fabric printing pattern. This scheme can realize the automatic alignment of printing press, find out the defects of poor color position of printing patterns in time and adjust them in time, so as to realize the high-precision and high-speed control of printing registration, and greatly improve the product quality and work efficiency. For the high-power frequency conversion speed regulation device suitable for coal mine production, although the technology of scattered bomb muffler in general industrial environment on the ground can be used in principle and basic components, the following key technologies must be solved in order to be suitable for mine use: ① explosion-proof structure design; ② heat dissipation -- explosion-proof and heat dissipation must be considered at the same time; ③ control and protection problems; ④ electromagnetic compatibility 。 Although the technology of general industrial environment on the ground can be used in principle and basic components of high-power frequency conversion speed regulating device suitable for coal mine production, the following key technologies must be solved in order to be suitable for mine use: ① explosion-proof structure design; ② heat dissipation -- explosion-proof and heat dissipation must be considered at the same time; ③ control and protection problems; ④ electromagnetic compatibility.