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J21 series of press is applicable open-crank press, characterized by open around the fuselage (that is, C-shaped fuselage). Bed plate welding, shock-absorbing good; The new unit design, the aesthetic appearance, I have a certain jets depth, compact structure, easy to use, safe operation; Transfer of key steel clutch, brake cam belt, and the collapse of a pressure-overload protective devices. Worktable in the following three areas is wide open, armament, die and unloading operations are more convenient. For the mechanization and automation has provided good conditions, which are widely used, it is sheet metal stamping the main production equipment, can be used for punching, blanking, trimming, bending, stretching and shallow forming processes is widely used in national defense, aviation, automobiles, tractors, motors, electrical appliances , bearings, instruments, farm machinery, farm tools, bicycles, sewing, medical equipment, daily hardware, mint, and other sectors.