Limiting mechanism for machining

The utility model discloses a limit mechanism for machining, which comprises a concave machining table and a machining support, the machining support is mounted on the concave machining table, a lifting transport structure is mounted on the concave machining table, and a limit structure is mounted on the concave machining table; the limiting structure comprises a supporting block, a concave limiting extrusion block, a convex limiting extrusion block, a horizontal extrusion shaft pipe, a horizontal limiting shaft, a horizontal limiting sleeve spring, a horizontal electromagnet, a horizontal stretching resistor, a horizontal magnet, a concentric-square-shaped adsorption electromagnet, a concentric-square-shaped adsorption magnet and a current regulator. The utility model relates to the technical field of machining, parts are horizontally conveyed and vertically adjusted through the lifting conveying structure, the parts with different shapes are magnetically repelled, extruded and limited through the limiting s