A bolt lock overload test device

Abstract

The invention discloses a bolt locking overload test device, which is arranged in a gun barrel. The gun head and the gun barrel cooperate to form a bolt locking mechanism, comprising a pressure measuring body, a cushion block, a copper column, a pressure measuring rod and a nut. The pressure measuring body is arranged at the front end of the nut. The pressure measuring body and the nut are fastened by threaded connection. A stepped hole is axially arranged inside the pressure measuring body, and a through hole is opened inside the nut along the axial direction. The cushion block is arranged in the small-diameter hole of the stepped hole of the pressure measuring body and is limited by the front end surface of the small-diameter hole. The pressure measuring rod is arranged in the large-diameter hole of the stepped hole of the pressure measuring body, and its rear end extends backwards into the through hole of the nut. The copper column is arranged in the middle-diameter hole of the stepped hole of the pressure measuring body and between the pressure measuring rod and the cushion block. The front end contacts with the cushion block, and the rear end contacts with the pressure measuring rod. The pressure measuring rod and the copper column can move axially in the stepped hole of the pressure measuring body. The test device can reliably and accurately measure the overload acceleration generated when the bolt is locked, and provide support for the matching of firearms and bullets.

Description

Technical Field

[0001] The invention belongs to the technical field of firearms and relates to a bolt locking overload testing device. Background Art

[0002] In firearm design, there are generally two situations of premature firing. One is that when the bolt is not locked, the firing mechanism releases the firing mechanism and fires the primer. The other is that when the bolt returns to its position but has not been locked, the firing pin strikes the primer forward by inertia.

[0003] From the practice in recent years, there is another situation that can also lead to premature firing. That is, during the process of the bolt pushing the bullet to lock, when the bullet contacts and positions with the barrel chamber, the overload acceleration generated by the bolt locking exceeds the overload resistance of the bullet primer. However, the industry currently has no bolt locking overload test device, and cannot carry out relevant gun and bullet matching design. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems and to provide a bolt lock overload test device with a simple structure, which can reliably and accurately measure the overload acceleration generated when the bolt is locked, and provide data support for the matching of firearms and bullets.

[0005] The present invention can be realized through the following technical scheme: a bolt lock overload test device is arranged in a gun barrel, and the gun head and the gun barrel cooperate to form a bolt lock mechanism, including a pressure measuring body, a cushion block, a copper column, a pressure measuring rod and a nut, the pressure measuring body is arranged at the front end of the nut, the pressure measuring body and the nut are fastened by threaded connection, a stepped hole is axially provided inside the pressure measuring body, a through hole is axially opened inside the nut, the cushion block is arranged in the small-diameter hole of the stepped hole of the pressure measuring body, and is limited by the front end surface of the small-diameter hole, the pressure measuring rod is arranged in the large-diameter hole of the stepped hole of the pressure measuring body, and its rear end extends backward into the through hole of the nut, the copper column is arranged in the middle-diameter hole of the stepped hole of the pressure measuring body, between the pressure measuring rod and the cushion block, the front end contacts with the cushion block, and the rear end contacts with the pressure measuring rod, and the pressure measuring rod and the copper column can move axially in the stepped hole of the pressure measuring body;

[0006] During the test, first load the bullet into the magazine, and then load the bolt lock overload test device into the magazine. When the bullet is fired, the bolt head pushes the bolt lock overload test device into the barrel chamber. After the bolt lock overload test device contacts and is positioned with the barrel chamber, the pressure measuring body stops moving, and the pressure measuring striker continues to move forward to compress the copper column. The copper column is compressed to produce compression deformation. The pressure value generated by the bolt lock is obtained through the size of the compression deformation, and then the overload acceleration generated when the bolt is locked is calculated, which can avoid the premature ignition failure caused by the bolt lock overload exceeding the overload resistance of the bullet primer.

[0007] Preferably, the pressure measuring body has an appearance similar to that of a bullet, and a rear end is provided with an internal thread connected to a nut.

[0008] Preferably, the cushion block is a cylinder, and its height and outer diameter are both smaller than the diameter and height of the small-diameter hole of the pressure measuring elastic body.

[0009] Preferably, the copper column is a structure with a cone at one end and a cylinder at the other end, the cone end contacts the pad, and the cylinder end contacts the pressure measuring rod. The outer diameter of the copper column is smaller than the diameter of the mid-diameter hole of the pressure measuring body, and the height of the copper column is greater than the height of the mid-diameter hole of the pressure measuring body. After installation, the two ends of the copper column are respectively placed in the small-diameter hole and the large-diameter hole. The copper column is also equipped with a pressure gauge, and the pressure P that the copper column is subjected to is obtained by the corresponding compression deformation of the copper column.

[0010] Preferably, the pressure measuring striker rod is a stepped shaft, the large end of which is placed in the large diameter hole of the pressure measuring elastic body, and the small end of which is placed in the through hole of the nut.

[0011] Preferably, the nut has a similar shape to the bottom of the shell, with an external thread connected to the pressure measuring body at the front end and a hook groove circumferentially provided at the rear end for grabbing by the shell extractor hook.

[0012] Preferably, the overload acceleration α generated when the bolt is locked is calculated by the following formula:

[0013] α=PS / Mg

[0014] Where: P is the pressure value obtained by the pressure gauge after the copper column is compressed and deformed, S is the surface area of ​​the contact surface of the striker, and M is the mass of the pressure measuring striker.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The bolt lock overload test device of the present invention adopts a structure with an appearance similar to that of a bullet. During testing, the bolt lock can be used to push the bolt lock overload test device into the barrel chamber for positioning. The pressure measuring chamber stops moving, while the pressure measuring striker continues to move due to inertia to compress the copper column. The pressure value borne by the copper column is obtained by the corresponding compression deformation of the copper column, and then the acceleration experienced by the bullet when the bolt lock is overloaded is accurately calculated, providing data support for the matching of firearms and bullets. The structural principle is simple and the conception is ingenious, and it can avoid premature ignition failure caused by the bolt lock overload exceeding the overload resistance capacity of the bullet primer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention in cooperation with the machine head and the gun barrel during testing;

[0018] Figure 2 It is a structural schematic diagram of the present invention.

[0019] Reference numerals

[0020] 1 is the machine head, 2 is the barrel, 3 is the locking overload test device, 301 is the pressure measuring body,

[0021] 302 is a spacer, 303 is a copper column, 304 is a pressure measuring rod, 305 is a nut, and 306 is a large diameter hole.

[0022] 307 is a medium diameter hole, 308 is a small diameter hole, and 309 is a hook groove. DETAILED DESCRIPTION

[0023] The embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0024] See also Figure 1-Figure 2 A bolt lock overload test device is arranged in a gun barrel 2. The gun head and the gun barrel cooperate to form a bolt lock mechanism. The bolt lock overload test device 3 includes a pressure measuring body 301, a cushion block 302, a copper column 303, a pressure measuring striker 304 and a nut 305. The pressure measuring body 301 has a shape similar to that of a bullet and is arranged at the front end of the nut 305 and is fastened to the nut 302 by threaded connection. A stepped hole is arranged inside the pressure measuring body 301 along the axial direction, and an internal thread connected to the nut 305 is arranged at the rear end.

[0025] The nut 305 has a similar appearance to the bottom of the shell, with a through hole axially opened inside, an external thread connected to the pressure measuring body 301 at the front end, and a hook groove 309 circumferentially provided at the rear end for the shell extractor to grab;

[0026] The cushion block 302 is disposed in the small-diameter hole 308 of the stepped hole of the pressure measuring elastic body and is limited by the front end surface of the small-diameter hole 308. The cushion block 302 is a cylinder, and its height and outer diameter are both smaller than the diameter and height of the small-diameter hole 308 of the pressure measuring elastic body.

[0027] The pressure measuring striker 304 is arranged in the large diameter hole 306 of the stepped hole of the pressure measuring body, and its rear end extends backward to the through hole of the nut 305. In this embodiment, the pressure measuring striker 304 adopts a stepped shaft, the large end is placed in the large diameter hole 306 of the pressure measuring body, and the small end is placed in the through hole of the nut 305;

[0028] The copper column 303 is arranged in the middle diameter hole 307 of the stepped hole of the pressure measuring elastic body, between the pressure measuring striker 304 and the cushion block 302, the front end is in conflict with the cushion block 302, and the rear end is in conflict with the pressure measuring striker 304. In this embodiment, the copper column 303 is a structure with a cone at one end and a cylinder at the other end, the cone end is in conflict with the cushion block 302, and the cylinder end is in conflict with the pressure measuring striker 304. The outer diameter of the copper column 303 is smaller than the diameter of the middle diameter hole 307 of the pressure measuring elastic body, and the height of the copper column 303 is greater than the height of the middle diameter hole 307 of the pressure measuring elastic body. After the copper column is installed, the two ends are respectively placed in the small diameter hole 308 and the large diameter hole 306. The copper column is also provided with a pressure gauge, and the pressure P borne by the copper column can be obtained by the corresponding compression deformation of the copper column;

[0029] The pressure measuring striker rod 304 and the copper column 303 can flexibly move along the axial direction in the stepped hole of the pressure measuring elastic body 301 .

[0030] During the test, first load a bullet into the magazine, then load the bolt lock overload test device 3 into the magazine. After the bullet is fired, the head pushes the bolt lock overload test device 3 into the barrel chamber. When the head pushes the bolt lock overload test device 3 to contact and position with the barrel chamber, the pressure measuring body 301 stops moving, while the pressure measuring striker 304 continues to move to compress the copper column 303. The pressure value P is found out through the copper column pressure gauge and the compression deformation of the copper column. The acceleration of the bullet when the bolt is overloaded can be calculated according to the formula α=PS / Mg, where S is the contact surface area of ​​the striker (calculated according to the diameter of the striker in the copper column pressure gauge, generally 1cm 2 ), M is the mass of the pressure measuring rod.

[0031] By designing the bolt lock overload test device, the overload acceleration generated when the bolt is locked can be reliably and accurately measured, providing data support for the matching of firearms and bullets. The structural principle is simple and the conception is ingenious. By measuring the overload acceleration, it can avoid premature ignition failure caused by the bolt lock overload exceeding the overload resistance capacity of the bullet primer.

[0032] It should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A bolt lock overload test device, arranged in a gun barrel, wherein the gun head and the gun barrel cooperate to form a bolt lock mechanism, characterized in that: It comprises a pressure measuring spring, a cushion block, a copper column, a pressure measuring striker and a nut, wherein the pressure measuring spring is arranged at the front end of the nut, the pressure measuring spring and the nut are fastened by threaded connection, a stepped hole is axially arranged inside the pressure measuring spring, a through hole is axially opened inside the nut, the cushion block is arranged in the small-diameter hole of the stepped hole of the pressure measuring spring, and is limited by the front end surface of the small-diameter hole, the pressure measuring striker is arranged in the large-diameter hole of the stepped hole of the pressure measuring spring, and its rear end extends backward to the through hole of the nut, the copper column is arranged in the middle-diameter hole of the stepped hole of the pressure measuring spring, between the pressure measuring striker and the cushion block, the front end contacts with the cushion block, and the rear end contacts with the pressure measuring striker, and the pressure measuring striker and the copper column can move axially in the stepped hole of the pressure measuring spring; During the test, first load the bullet into the magazine, then load the bolt lock overload test device into the magazine. When the bullet is fired, the bolt head pushes the bolt lock overload test device into the barrel chamber. After the bolt lock overload test device contacts and positions with the barrel chamber, the pressure measuring body stops moving, and the pressure measuring striker continues to move forward to compress the copper column. The copper column is compressed to produce compression deformation. The pressure value generated by the bolt lock is obtained through the size of the compression deformation, and then the overload acceleration generated when the bolt is locked is calculated to avoid premature ignition failure caused by the bolt lock overload exceeding the overload resistance capacity of the bullet primer. The pressure measuring body has a shape similar to that of a bullet, and has an internal thread connected to a nut at the rear end; The cushion block is a cylinder, and its height and outer diameter are both smaller than the diameter and height of the small-diameter hole of the pressure measuring elastic body; The copper column is a structure with a cone at one end and a cylinder at the other end. The cone end contacts the pad, and the cylinder end contacts the pressure measuring rod. The outer diameter of the copper column is smaller than the diameter of the mid-diameter hole of the pressure measuring body, and the height of the copper column is greater than the height of the mid-diameter hole of the pressure measuring body. After the copper column is installed, the two ends are respectively placed in the small-diameter hole and the large-diameter hole. The copper column is also equipped with a pressure gauge, and the pressure P that the copper column is subjected to is obtained by the compression deformation of the copper column.

2. A bolt lock overload test device according to claim 1, characterized in that: The pressure measuring striker is a stepped shaft, the large end of which is placed in the large diameter hole of the pressure measuring elastic body, and the small end of which is placed in the through hole of the nut.

3. The bolt lock overload test device according to claim 1, characterized in that: The nut has a similar shape to the bottom of the shell, with an external thread connected to the pressure measuring body at the front end and a hook groove circumferentially arranged at the rear end for grabbing the shell extractor hook.

4. The bolt lock overload test device according to claim 1, characterized in that: The overload acceleration α generated when the bolt is locked is calculated by the following formula: α=PS / Mg Where: P is the pressure value obtained by the pressure gauge after the copper column is compressed and deformed, S is the surface area of ​​the contact surface of the striker, and M is the mass of the pressure measuring striker.

Images