Quick-change shell pulling hook shaft limiting protection structure

Abstract

The invention discloses a quick-change shell pulling hook shaft limiting protection structure. The quick-change shell pulling hook shaft limiting protection structure comprises a machine frame body, amachine head body, a shell pulling hook and a shell pulling hook shaft installed on the machine head body; a convex bamboo shoot is arranged at the front end of the machine frame body in the axial direction, and the convex bamboo shoot is located right behind a locking tooth of the machine head body in the unlocking state of a bolt and used for pressing the shell pulling hook shaft; the shell pulling hook shaft comprises a rod part and a head part, a containing groove is formed in the front end of the rod portion of the machine head body in the axial direction and used for containing the headportion of the shell pulling hook shaft and preventing the head portion of the shell pulling hook shaft from twisting, and a through hole is formed in the containing groove in the radial direction and used for installing the rod portion of the shell pulling hook shaft; and in the unlocking / locking work cycle of the bolt, the head of the shell pulling hook shaft is always blocked by the bottom ofthe convex bamboo shoot at the front end of the machine frame body and does not jump out of the machine head body. By means of the structure, the maintenance performance of the bolt can be improved, the rapid replacement, disassembly and cleaning requirements of the shell pulling hook shaft are met conveniently, the peripheral size of a machine head is not occupied, the size of a firearm locking part is not increased, firearm weight reduction is facilitated, and maneuverability is improved.

Description

technical field [0001] The invention relates to the technical field of firearms, in particular to a quick-change shell-pull hook shaft limit protection structure. Background technique [0002] Foreign AR series rifles such as M16, M4, etc., all use cylindrical shell hook shafts. During the unlocking / locking working cycle, the shell hook shafts are completely blocked by the machine frame to prevent them from escaping. The advantages are: The structure is simple and the workmanship is good, but its structure is only suitable for structures with small unlocking / locking strokes. A small opening and closing stroke means a large opening and closing helix angle and a small free travel after locking, and a large opening and closing helix angle brings opening and closing resistance The big problem is that the free stroke after locking is small, only the elastic shell ejection structure can be used, and the ejection spring of the elastic shell ejection structure can be used to overcom...

AI Technical Summary

Problems solved by technology

[0002] Foreign AR series rifles such as M16, M4, etc., all use cylindrical shell hook shafts. During the unlocking / locking working cycle, the shell hook shafts are completely blocked by the machine frame to prevent them from escaping. The advantages are: The structure is simple and the workmanship is good, but its structure is only suitable for structures with small unlocking / locking strokes. A small opening and closing stroke means a large opening and closing helix angle and a small free travel after locking, and a large opening and closing helix angle brings opening and closing resistance The big problem is that the free stroke after locking is small, only the elastic shell ejection structure can be used, and the ejection spring of the elastic shell ejection structure can be used to overcome the bouncing of the bolt in place, and the elastic shell ejection structure is affected by the ejection spring. There is a problem of poor reliability under the conditions of river water with sediment and dust

Foreign AK series and domestic 56-stroke series, 81-type rifle series, and 95 / 95-1-type squad gun family all adopt the structure of locking the puller hook shaft with a solid or elastic cylindrical firing pin, which has the advantage of simple structure , good workmanship, but the size of the machine head structure is large, resulting in a large structure and heavy weight of the whole gun, and there is a risk that the shell hook shaft will escape during work and affect reliability

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