A firepower axis extraction device

Abstract

The present invention discloses a fire axis extraction device, which includes a dumbbell shaft disposed inside a gun barrel, and dumbbell ends disposed at both ends of the dumbbell shaft. One of the dumbbell ends is provided with a lead screw hole and is connected to one end of an extension cylinder portion. The central axis of the extension cylinder portion is parallel to the central axis of the dumbbell shaft. A fixing block is disposed on the dumbbell shaft. One end of the lead screw sequentially passes through the extension cylinder portion, the lead screw hole, and the threaded hole on the fixing block and is movably connected to a wedge-shaped slider. The lead screw is threadedly connected to the threaded hole on the fixing block. A top block device is disposed on the dumbbell shaft. The wedge-shaped slider abuts against the top block device. Claws are disposed at the edge of each dumbbell end. The present invention can fix the dumbbell shaft in the gun barrel through the lead screw outside the gun barrel, make the central axis of the dumbbell shaft parallel to the fire axis, and then extract the fire axis through the extension cylinder portion, so as to more conveniently measure the azimuth and elevation angle of the fire axis.

Description

Technical Field

[0001] The present invention belongs to the technical field of gun barrels, and particularly relates to a device for leading out the fire axis. Background Art

[0002] In the prior art, generally two methods are adopted to lead out the fire axis. The first method for leading out the fire axis uses an optical aiming method to lead out the fire axis of the gun barrel. Marks are pasted on the barrel of the gun barrel, and a total station is used to aim at the marks to measure the position of the fire axis. The second method for leading out the fire axis uses a tightly-fitted workpiece inserted into the gun barrel to lead out the fire axis. The first method for leading out the fire axis has complex operations; the second method for leading out the fire axis has high processing requirements. If it is too tight, disassembly and assembly are laborious, and if it is too loose, the accuracy is poor, and it can only be adapted to gun barrels of a single caliber. Summary of the Invention

[0003] The purpose of the present invention is to provide a device for leading out the fire axis in view of the above problems existing in the prior art.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A device for leading out the fire axis includes a dumbbell shaft arranged in the gun barrel, and also includes dumbbell end heads arranged at both ends of the dumbbell shaft. One of the dumbbell end heads is provided with a screw rod hole and is connected to one end of an extension cylinder part. The central axis of the extension cylinder part is parallel to the central axis of the dumbbell shaft. A fixing block is arranged on the dumbbell shaft. One end of a screw rod sequentially passes through the extension cylinder part, the screw rod hole and the threaded hole on the fixing block and is movably connected to a wedge-shaped slider. The screw rod is threadedly connected to the threaded hole on the fixing block. A top block device is arranged on the dumbbell shaft. The wedge-shaped slider abuts against the top block device. Claws are arranged at the edge of each dumbbell end head.

[0006] As described above, the top block device includes a top block bracket, a limiting plate, a top block and a spring. The limiting plate is arranged on the top block bracket. The top of the top block penetrates through the top block perforation on the limiting plate. A limiting ear is arranged at the bottom of the top block, and the limiting ear cannot pass through the top block perforation. Both ends of the spring are respectively connected to the limiting ear and the limiting plate. The wedge-shaped slider abuts against the bottom of the top block.

[0007] As described above, the top of the top block is arc-shaped.

[0008] As described above, two claws are arranged at the edge of each dumbbell end head in the opposite direction of the jacking direction of the top block of the top block device.

[0009] Compared with the prior art, the present invention has the following advantages:

[0010] 1. The structure is simple and it is convenient to use;

[0011] 2. The dumbbell shaft can be fixed in the gun barrel through a lead screw outside the gun barrel, and the central axis of the dumbbell shaft is parallel to the central axis (firing axis) of the gun barrel. Then, the firing axis is led out through the extension cylinder part, which is more convenient for measuring the azimuth and elevation angle of the firing axis. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the installation position of the present invention.

[0013] Figure 2 is Figure 1 the schematic cross-sectional structure of A-A in

[0014] Figure 3 It is a schematic diagram of the structure of the present invention.

[0015] In the figure: 1 - gun barrel; 2 - dumbbell shaft; 3 - dumbbell end; 4 - lead screw hole; 5 - extension cylinder part; 6 - fixing block; 7 - lead screw; 8 - wedge-shaped slider; 9 - top block device; 10 - claw; 11 - flash hider; 901 - top block bracket; 902 - limit plate; 903 - top block; 904 - spring; 905 - top block perforation; 906 - limit ear. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] For the convenience of those of ordinary skill in the art to understand and implement the present invention, the present invention will be further described in detail below in conjunction with embodiments. It should be understood that the embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0017] A firing axis leading-out device includes a dumbbell shaft 2 arranged in a gun barrel 1, and also includes dumbbell ends 3 arranged at both ends of the dumbbell shaft 2. The dumbbell ends 3 are disc-shaped, and the two dumbbell ends 3 are parallel and perpendicular to the central axis of the dumbbell shaft 2. One of the dumbbell ends 3 is provided with a lead screw hole 4 and is connected to one end of an extension cylinder part 5. The two end faces of the extension cylinder part 5 are perpendicular to the central axis of the dumbbell shaft 2, and the central axis of the extension cylinder part 5 is parallel to the central axis of the dumbbell shaft 2. A fixing block 6 is arranged on the dumbbell shaft 2. One end of a lead screw 7 sequentially passes through the extension cylinder part 5, the lead screw hole 4 and the threaded hole on the fixing block 6 and is movably connected to a wedge-shaped slider 8. One end of the lead screw 7 is provided with a hexagonal screw structure for easy rotation with a wrench. The lead screw 7 can rotate circumferentially relative to the wedge-shaped slider 8 but cannot move axially relative to the wedge-shaped slider 8. The lead screw 7 is threadedly connected to the threaded hole on the fixing block 6, as Figure 3As shown in the figure, when the lead screw 7 rotates, the lead screw 7 will screw in (to the right) or out (to the left) relative to the fixed block 6. The lead screw 7 drives the wedge-shaped slider 8 to move to the right or to the left. A top block device 9 is provided on the dumbbell shaft 2. The wedge surface of the wedge-shaped slider 8 abuts against the bottom of the top block 903 of the top block device 9. When the wedge-shaped slider 8 moves to the right, the wedge surface of the wedge-shaped slider 8 pushes the top block 903 of the top block device 9 to move upward. Under the action of the reaction force, the dumbbell ends move in opposite directions. Claws 10 are provided on the edges of each dumbbell end 3. Both the top block 903 and the claws 10 abut against the inner wall of the gun barrel 1, thereby fixing the position of the dumbbell shaft 2 in the gun barrel 1 and making the central axis of the dumbbell shaft 2 parallel to the central axis of the gun barrel 1.

[0018] Preferably, two claws 10 are provided on the edge of each dumbbell end 3 in the opposite direction to the lifting direction of the top block 903 of the top block device 9. It is also possible that a plurality of claws 10 are evenly provided on the edge of the dumbbell end 3.

[0019] The top block device 9 includes a top block bracket 901, a limit plate 902, a top block 903 and a spring 904. The limit plate 902 is provided on the top block bracket 901. The top of the top block 903 penetrates through the top block perforation 905 on the limit plate 902. A limit ear 906 is provided at the bottom of the top block 903, and the limit ear 906 cannot pass through the top block perforation 905. The two ends of the spring 904 are respectively connected to the limit ear 906 and the limit plate 902. The wedge-shaped slider 8 abuts against the bottom of the top block 903. Preferably, the top of the top block 903 is arc-shaped. As Figure 3 shown, the top block bracket 901 is provided on the dumbbell shaft 2. When the wedge-shaped slider 8 moves to the right and pushes the top block 903 of the top block device 9 to move upward, the spring 904 is compressed. When the wedge-shaped slider 8 moves to the left, the thickness of the wedge-shaped slider 8 below the top block 903 decreases. Under the action of the restoring force, the spring 904 pushes the top block 903 downward through the limit ear 906, and both the top block 903 and the claws 10 release the contact with the inner wall of the gun barrel 1.

[0020] The extension cylinder part 5 is mainly used to avoid the muzzle flash suppressor part, so that the dumbbell end 3 can completely extend into the barrel interior. An opening is provided at the front of the extension cylinder part to allow a wrench to extend in and rotate the lead screw. The structure composed of the dumbbell shaft 2 and the dumbbell ends 3 at both ends is a rotating body. The outer wall and end face can be machined in one go using a high-precision lathe, which can ensure that the central axis of the dumbbell shaft 2 is perpendicular to the end faces of the two dumbbell ends 3. The extension cylinder part 5 is a hollow circular tube, and it is also machined in one go to ensure that its axis is perpendicular to the end face. When the extension cylinder part 5 is fastened to the end face of one side dumbbell end 3 using the conical coaxial positioning method, it can be ensured that the axis of the extension cylinder part 5 is also parallel to the central axis of the barrel 1, and the end face of the extension cylinder part 5 is perpendicular to the central axis of the barrel 1. Therefore, the end face of the extension cylinder part 5 can be used as the equipment installation reference plane to lead out the fire axis of the barrel, and then the azimuth and elevation angle of the fire axis can be measured.

[0021] The principle of the fire axis leading-out device is: an extension cylinder part 5 extends out from the barrel. When it is locked and fixed in the barrel, its own axis is nearly coincident with the barrel axis; the equipment installation reference plane provided is perpendicular to its own axis.

[0022] In order to make the axis of the fire axis leading-out device nearly coincide with the barrel axis, 3 positioning points are set on the circumference at each of 2 different positions on the outer wall. Among them, 2 positioning points are fixed points, and 1 point is a movable point. When the movable point contracts, the fire axis leading-out device can extend into the muzzle interior. When the movable point is pushed outwards, the 3 positioning points on the same circumference are pressed against the inner wall of the barrel. According to the principle of three points being on the same circle, at this time, three points on the same circle are achieved at both 2 different positions on the outer wall of the fire axis leading-out device. The circumferences of these 2 positions are connected to form the inner wall of the barrel; in this way, the parallelism between the axis of the fire axis leading-out device and the barrel axis is ensured. When the fire axis leading-out device is machined in one go, the outer circle is machined by transverse feed and the end face is machined by longitudinal feed, which can ensure that the end face for installing the equipment is perpendicular to its axis.

[0023] In order to achieve the coaxiality of 3 positioning points at 2 different positions on its outer wall, the blank of the fire axis leading-out device is set into a dumbbell structure, and the length is preferably 600 mm; in order to ensure the wear resistance of its positioning points, the two ends of the dumbbell structure are preferably made of stainless steel, and the middle spindle is preferably made of hard aluminum alloy 6063 based on weight reduction considerations; the end part and the spindle part adopt the hot pressing process to be integrally fastened into a dumbbell shape. Then it is clamped on a CNC lathe, and the outer walls of the two ends of the dumbbell, the mounting surfaces of the two ends of the dumbbell, and the outer wall of the spindle are machined in one go. After the turning process is completed, it is transferred to a large-stroke CNC milling machine to machine the positioning points (claws 10) on the two ends of the dumbbell, so as to ensure the coaxiality of the positioning points at the same position. For the convenience of installation, the movable vertices at 2 positions are combined into one and set on the top block 9.

[0024] It should be noted that the specific embodiments described in the present invention are only illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains may make various modifications or supplements to the described specific embodiments or use similar means for substitution, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A fire axis extraction device, comprising a dumbbell shaft (2) arranged in a gun barrel (1), characterized in that, It further includes dumbbell end heads (3) arranged at both ends of the dumbbell shaft (2). A screw rod hole (4) is formed in one of the dumbbell end heads (3) and is connected to one end of an extension cylinder part (5). The central axis of the extension cylinder part (5) is parallel to the central axis of the dumbbell shaft (2). A fixing block (6) is arranged on the dumbbell shaft (2). One end of a screw rod (7) sequentially passes through the extension cylinder part (5), the screw rod hole (4) and a threaded hole in the fixing block (6) and is movably connected to a wedge-shaped slider (8). The screw rod (7) is threadedly connected to the threaded hole in the fixing block (6). A top block device (9) is arranged on the dumbbell shaft (2). Claws (10) are arranged at the edges of each dumbbell end head (3). The top block device (9) includes a top block bracket (901), a limiting plate (902), a top block (903) and a spring (904). The limiting plate (902) is arranged on the top block bracket (901). The top of the top block (903) penetrates through a top block through hole (905) in the limiting plate (902). A limiting ear (906) is arranged at the bottom of the top block (903). The limiting ear (906) cannot pass through the top block through hole (905). Two ends of the spring (904) are respectively connected to the limiting ear (906) and the limiting plate (902). The wedge-shaped slider (8) abuts against the bottom of the top block (903).

2. The fire axis extraction device according to claim 1, characterized in that, The top of the top block (903) is arc-shaped.

3. A fire axis extraction device according to claim 1, characterized in that, Two claws (10) are arranged at the edge of each dumbbell end head (3) in the direction opposite to the jacking direction of the top block (903) of the top block device (9).

4. A fire axis extraction device according to claim 1, characterized in that, The dumbbell end head (3) is made of stainless steel, and the dumbbell shaft (2) is made of hard aluminum alloy 6063.

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