At present, the printing industry, drying machine, flexo printing machine, gravure machine, trademark printing machine, food packaging industry, etc. use single (single roll) printing, which has low production efficiency and high energy consumption. The problem to be solved is to overcome the problem. There are technical deficiencies, and a device for collecting and releasing air-expansion shafts using magnetic powder braking and clutching is provided. The device is not only reasonable in design, reliable in use, but also improves work efficiency. The new technical solution adopted is that the magnetic powder clutch and the magnetic powder brake are used to assemble and release the air expansion shaft device. The intermediate connection in the transmission box is installed to unwind the air expansion shaft, and the right side wall is connected to install the winding air expansion shaft, and the left side wall is connected and installed. Roll-up detector, the lower side wall is connected with the winding tension detector, and the connection between the unwinding air-expansion shaft and the winding air shaft, the winding tension detector, and the unwinding detector are connected. The guide roller, the right outer side of the transmission box is provided with a unwinding tension controller for controlling the magnetic powder brake and a winding tension controller for controlling the magnetic powder clutch. By using 吋, the utility model can be connected to the corresponding position of the original printing machine for printing a single film substrate to realize double strip (double roll) printing. The new combination method solves the problem that the original printing machine can only print a single film substrate, and greatly improves the production efficiency. Selection, quotation.

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