Stroke of a press has a grade adjusting device

The utility model discloses a stroke of a press has a grade adjusting device, including bent axle, flywheel, eccentric cover, connect eccentric cover, eccentric cover slewing mechanism and connect eccentric cover moving mechanism, connect eccentric cover and support on the bent axle other end, the adjacent terminal surface of connecting eccentric cover and eccentric cover respectively equipartition round dogtooth and tooth's socket position correspond be connected eccentric cover terminal surface dogtooth and eccentric cover terminal surface dogtooth, it is cheng integrative with the crisscross interdigitating junction of eccentric cover terminal surface dogtooth to connect eccentric cover terminal surface dogtooth. Off -centre cover slewing mechanism sets up and overlaps lower part and eccentric butt joint department of overlapping and being connected off -centre and overlap in connection off -centre, connects the eccentric moving mechanism of overlapping and is located the outside that slewing mechanism is