The shearing machine is an important equipment on the unwinding line, and the number of shearing strokes of the shearing machine largely determines the productivity of the unwinding line. The shearing machine in the unwinding line is generally different from the ordinary shearing machine, because the unwinding line has the following special requirements for the shearing machine. (1) High productivity. For a 3mm thick unwinding line, it is required to cut 30-35 sheets per minute for a fixed length of 2000mm, and 80 sheets per minute for a fixed length less than 500mm. Such high productivity is beyond the capacity of a universal shearing machine& nbsp; (2) Full load. Many users of the unwinding line work in 2-3 shifts, and the shearing machine needs to cut 10000 to 20000 times a day. A universal shearing machine cannot be used with such a load& nbsp; (3) High reliability. If the shearing machine in the unwinding line stops, it will shut down the entire unwinding line. For users like car factories, a shutdown of one unwinding line can also cause several stamping lines to shut down. Therefore, it is required that the failure rate of the shearing machine in the unwinding line be as low as possible, and the fault diagnosis and elimination be relatively easy& nbsp; (4) The diversity of roll materials. The universal shearing machine is determined by ordinary carbon steel to determine the shear force, while the material of the coil material includes high-strength stainless steel plates, weather resistant steel plates, acid washed plates, etc. in addition to low strength galvanized sheets, tinplate, color coated plates, aluminum plates, etc. The coil materials used in car production include uncoated cold-rolled sheet, hot-rolled pickled sheet, high-strength cold-rolled sheet, high-strength galvanized sheet, single and double-sided electrolyte coated sheet, single and double-sided hot-dip galvanized sheet, aluminum sheet, etc. Users of the unwinding line often cannot provide the mechanical properties of the processed materials, so when designing and selecting a shearing machine, the applicability of the machine must be considered& nbsp; (5) Special cutting method. Some unwinding lines require the burrs on the surface of the sheet metal to be cut upwards in order to prevent them from scratching during stacking. Therefore, the blade holder of the shearing machine should cut from bottom to top. This type of shearing machine is called a down cutting shearing machine. The cut sheet material falls onto the moving conveyor belt, and in order to avoid skewing, it is required that the blade shape on the knife holder be in a herringbone shape, which is particularly necessary for sheet materials with shorter fixed length& nbsp;& nbsp; & nbsp; & nbsp; In summary, ordinary shearing machines cannot meet the requirements of unwinding lines and must be designed with specialized shearing machines. The shearing machines produced by Jinan Zeye Machine Tool Manufacturing Co., Ltd. have much greater strength, stiffness, and energy reserves than ordinary shearing machines. It is necessary to break through certain design concepts of ordinary shearing machines in order to make specialized shearing machines better meet the requirements of the unwinding line.