Two-jaw-plate opening type power tong head clamping mechanism for hydraulic cylinder lever clamping

The utility model relates to a tong head clamping mechanism for two jaw plate opening type power tongs clamped by a hydraulic cylinder lever, which is characterized in that two jaw plate assemblies are respectively arranged in bolts on clamping arms on two sides to form a movable hinge rotation pair; an inner arc of an arc tooth block on the jaw plate assembly is contained in a clamped tubular column, and under the state that the tubular column is clamped, the circle center of the inner arc is concentric with the center of the clamped tubular column and the rotating center of the tong head opening large gear. And an acute angle beta is formed between the connecting line of the center of the bolt on the clamping arm on one side and the center of the inner arc of the arc-shaped tooth block on the jaw plate assembly and the symmetric axis A-O of the opening of the tong head opening large gear. The hydraulic cylinder is adopted to drive the lever to clamp the two jaw plate clamping mechanisms, the single-rod hydr