Anti-retreating quick-adjusting closure insert

The utility model relates to an anti-retreating quick-adjusting cut-off insert. The anti-retreating quick-adjusting cut-off insert comprises a bottom plate arranged on the upper surface of a fixed mold, a cut-off movable block and a fastener penetrating through the bottom plate and the cut-off movable block, a runner and a mounting hole corresponding to the fastener are formed in the upper surfaceof the fixed mold; the closure movable block is provided with an adjusting groove corresponding to the fastener; the closure movable block is provided with a closure baffle for shielding the flow channel to perform closure; a first tooth opening is formed in the side, facing the closure movable block, of the bottom plate. The closure movable block is provided with a second tooth opening matched with the first tooth opening; the extending direction of the first tooth opening is not perpendicular to the moving direction of the closure movable block. The quick adjustment type closure insert hasthe advantages of being go