Self-locking clamping mechanism of clamp

The invention relates to a self-locking clamping mechanism of a clamp. According to the self-locking clamping mechanism, a connection plate is fixed on a base; a second clamping plate is hinged on the connection plate through a pin shaft; a press head is welded on the second clamping plate; a first clamping plate, a limit column, a support block and a lower limit block are fixed on the connection plate; a first hinge point of a second self-locking block is hinged on the first clamping plate through a pin shaft; a second hinge point of the second self-locking block is hinged with a first hinge point of a first self-locking block through a pin shaft; a second hinge point of the first self-locking block is hinged with the rear end part of the press head through a pin shaft; the first self-locking block is matched with the limit column; a press block is fixed on the front end part of the press head; the press block is matched with the support block; an upper limit block is fixed at the middle part of the lower surface of the press head; and the upper limit block is matched with the lower limit block. The self-locking clamping mechanism disclosed by the invention is capable of realizing a large opening angle and a high clamping force without the need of increasing a cylinder stroke. The self-locking clamping mechanism disclosed by the invention is simple in structure, low in cost and high in stability.