Injection rod limit device for diecasting local extrusion

The utility model relates to the field of accessories or parts of compression casting, in particular to an injecting rod limit device for diecasting local extrusion. The injection rod limit device for diecasting the local extrusion comprises an injection rod (1) and is characterized in further comprising a push-back pin (2) and a shell body (3). The injection rod and the push-back pin (2) are fixed in coaxial mode, the shell body (3) is in a cylinder shape with two ends closed, and through holes are opened in the two end faces of the shell body (3). A base plate of the injection rod (1) and a base plate of the push-back pin (2) are both arranged inside the shell body (3), a connecting rod of the injection rod (1) and a connecting rod of the push-back pin (2) respectively penetrate through the through holes of the two end faces of the shell body (3), and the connecting rod of the injection rod (1) and the connecting rod of the push-back pin (2) are respectively sealed with the through holes of the two end face