A fixing device and method for testing the bias value of a sniper rifle

Abstract

The present invention discloses a fixing device and method for testing the bias value of a sniper rifle, which is low-cost, short-time-consuming, and safe. The fixing device includes a base, an upper cover and a clamping arm hinged on the base, a V-shaped groove provided between the hinge points of the upper cover and the clamping arm, a rectangular notch provided on the upper cover for the clamping arm to pass through, a screw provided at the free end of the clamping arm, a nut provided on the screw, and the nut used to clamp the upper cover so that the upper cover clamps the gun barrel. A method for testing the bias value comprises installing the base on a test bench, adjusting the gun face to be perpendicular to the ground and the gun barrel to be parallel to the ground, and then tightening the nut; setting target paper and aiming points; correcting the shooting effect; after tilting the gun face 90° to the left, conducting a shooting test, and recording the average impact point coordinate 1; after tilting the gun face 90° to the right, conducting a shooting test, and recording the average impact point coordinate 2; half the height difference between coordinate 2 and coordinate 1 is the bias value of the firearm under test at that shooting distance.

Description

Technical Field

[0001] The present invention relates to the technical field of firearms, and in particular to a fixing device and method for testing the bias flow value of a sniper rifle. Background Art

[0002] Modern firearms are typically designed with rifling, and the direction of rotation is always right-handed. This is intended to impart a rotating motion to the projectile, maintaining flight stability, improving accuracy, and increasing penetration power. However, a projectile traveling in right-handed rotation produces a systematic deviation to the right from the shooting plane, known as drift. To date, there is no universally applicable calculation method for all firearms. Therefore, the drift of each specific firearm still needs to be determined through shooting tests.

[0003] There are two common methods for measuring firearm drift. The first involves simultaneously firing a right-handed and a left-handed gun at a target, following the test method outlined in GJB 349.6-1987, "Conventional Weapon Type Approval Test Methods - Preparation of Firearm Shooting Tables." This method requires the specialized design and manufacture of left-handed guns, which is costly and time-consuming. The second method involves head-on firing, where two firearms fire toward each other to determine drift. This method offers lower accuracy and poses significant challenges in establishing a safe test site, making it difficult to implement in practice. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a fixing device and method for testing the deviation value of a sniper rifle. The fixing device has a simple structure, is quick to assemble and disassemble, is firmly clamped, and the gun face can be fixed at any angle; the deviation value testing method is low in cost, short in time, and safe in testing.

[0005] The object of the present invention is achieved like this:

[0006] A fixing device for testing the deviation value of a sniper rifle comprises a base, an upper cover and a clamping arm hinged on the base, a V-shaped groove is provided between the hinge points of the upper cover and the clamping arm, the V-shaped groove is used to cooperate with the outer circle of the gun barrel for positioning, a rectangular notch is provided on the upper cover, the rectangular notch is passed through by the clamping arm, the free end of the clamping arm is a screw, the screw is fitted with a nut, the nut is used to compress the upper cover so that the upper cover presses the gun barrel.

[0007] Preferably, the base is an inverted T-shaped structure, the upper cover and the clamping arm are hinged on both sides of the raised portion of the base, and through holes for connecting with the shooting test bench are provided around the bottom plate of the base.

[0008] A method for testing bias current value,

[0009] 1) Install the base on the test bench, place the barrel on the V-groove, adjust the gun face to be perpendicular to the ground and the barrel to be parallel to the ground, tighten the nut, and install the gun body in place;

[0010] 2) Set up a target paper at the range where the deviation value needs to be tested, with the target surface perpendicular to the axis of the barrel, and set the aiming point at the center of the target paper;

[0011] 3) Operate the gun to correct the shooting effect and align the center of the sight with the impact point and the aiming point;

[0012] 4) Loosen the nut, tilt the gun 90° to the left, tighten the nut, and install the gun in place;

[0013] 5) Adjust the test bench so that the center of the sight is aligned with the aiming point set on the target paper, and conduct a shooting test, recording the average impact point coordinates 1;

[0014] 6) Loosen the nut, tilt the gun 90° to the right, tighten the nut, and install the gun in place;

[0015] 7) Adjust the test bench so that the center of the sight is aligned with the aiming point set on the target paper; conduct a shooting test and record the average impact point coordinates 2;

[0016] 8) Half the height difference between coordinate 2 and coordinate 1 is the deflection value of the firearm under test at that shooting distance.

[0017] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0018] The V-shaped groove fits the cylindrical barrel of the firearm, and the screw-nut structure compresses the upper cover for clamping and fixing. This fixing device has a simple structure, is quick to assemble and disassemble, and provides a secure clamping force. The gun face can be fixed at any angle to facilitate bias flow testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 It is a schematic diagram of the connection between the fixing device and the gun body;

[0021] Figure 3 This is a schematic diagram of the gun being installed vertically to the ground;

[0022] Figure 4 This is a schematic diagram of the installation with the gun tilted 90° to the left;

[0023] Figure 5 This is a diagram of the installation with the gun tilted 90° to the right;

[0024] Figure 6 Schematic diagram of bias current value.

[0025] Reference numerals

[0026] In the accompanying drawings, 1-base; 2-upper cover; 3-clamping arm; 4-first rotating shaft; 5-second rotating shaft; 6-nut; 7-gasket; 8-first retaining ring; 9-second retaining ring, 10-gun body, 11-sight. DETAILED DESCRIPTION

[0027] The present invention will be further described below with reference to the accompanying drawings.

[0028] The present invention relates to a fixing device and method for testing the bias flow value of a sniper rifle, and in particular to a fixing device capable of tilting a gun face to any angle for fixing and performing an accuracy test, as well as a bias flow testing and calculation method.

[0029] See also Figure 1 、 Figure 2 A fixture for testing the drift value of sniper rifles uses a V-shaped groove to mate with the cylindrical barrel of the firearm, and a screw-nut structure to clamp the upper cover. This fixture has a simple structure, quick assembly and disassembly, and provides a secure clamp. The gun face can be fixed at any angle for drift testing.

[0030] Based on the cylindrical shape and floating mounting characteristics of sniper rifle barrels, a fixture for sniper rifle precision shooting tests was designed. The fixture primarily consists of a base, a cover, a clamping arm, a rotating shaft, a nut, a gasket, and a retaining ring. The base is an inverted T-shaped structure with a V-groove. Four through-holes are provided at the bottom of the base for connection to the shooting test bench. A V-groove is designed on the top to mate with the outer diameter of the barrel. A left through-hole is designed on the left side for connection to the cover via a first rotating shaft, and a right through-hole is designed on the right side for connection to the clamping arm via a second rotating shaft. A cover connection hole is designed on the left side of the cover, which fits over the first rotating shaft and connects to the base. A rectangular notch is provided on the right side for the clamping arm to pass through. A clamping arm connection hole is provided below the cover, which fits over the second rotating shaft and connects to the base. The top portion is cylindrical, with threads on the cylindrical surface forming a screw, which fits the mounting gasket and nut.

[0031] A method for testing a bias current value. During the test, the base is first fixed on a test bench, and then the body of the sniper rifle is removed (disassembled from the gun).

[0032] 1) Insert the gun body into the V-shaped groove on the top of the base, adjust the gun face to be perpendicular to the ground and the barrel to be parallel to the ground, then tighten the nut and install it in place. Figure 3 shown.

[0033] 2) Set up a target paper at the shooting distance where the deviation value needs to be tested, with the target surface perpendicular to the axis of the barrel, and set the aiming point at the center of the target paper.

[0034] 3) Operate the gun to perform shooting effect correction, and align the center of the sight with the impact point and the aiming point.

[0035] 4) Loosen the nut, tilt the gun 90° to the left, and then tighten the nut to install it in place. Figure 4 shown

[0036] 5) Adjust the test bench so that the center of the sight is aligned with the aiming point set on the target paper. Conduct a shooting test and record the average impact point coordinates 1.

[0037] 6) Loosen the nut, tilt the gun to the right 90 degrees, tighten the nut and install it in place. Figure 5 shown.

[0038] 7) Adjust the test bench so that the center of the sight is aligned with the aiming point set on the target paper. Conduct a shooting test and record the average impact point coordinates.

[0039] 8) Half of the height difference between coordinate 2 and coordinate 1 is the deflection value of the firearm under test at that shooting distance, such as Figure 6 As shown, 0.5H is the bias current value.

[0040] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A method for testing a bias current value, characterized in that: The device comprises a fixing device for testing the bias value of a sniper rifle, the fixing device for testing the bias value of a sniper rifle comprising a base, an upper cover and a clamping arm being hingedly connected to the base, a V-shaped groove being provided between the hinge points of the upper cover and the clamping arm, the V-shaped groove being used to cooperate with the outer circle of the gun barrel for positioning, a rectangular notch being provided on the upper cover, the clamping arm passing through the rectangular notch, a screw being provided at the free end thereof, a nut being provided on the screw, the nut being used to compress the upper cover so that the upper cover is pressed against the gun barrel; The base is an inverted T-shaped structure, with the upper cover and the clamping arm hingedly connected on both sides of the raised portion of the base, and through holes for connecting to the shooting test bench are provided around the bottom plate of the base; 1) Install the base on the test bench, place the barrel on the V-groove, adjust the gun face to be perpendicular to the ground and the barrel to be parallel to the ground, tighten the nut, and install the gun body in place; 2) Set up a target paper at the range where the deviation value needs to be tested, with the target surface perpendicular to the axis of the barrel, and set the aiming point at the center of the target paper; 3) Operate the gun to correct the shooting effect and align the center of the sight with the impact point and the aiming point; 4) Loosen the nut, tilt the gun 90° to the left, tighten the nut, and install the gun in place; 5) Adjust the test bench so that the center of the sight is aligned with the aiming point set on the target paper, and conduct a shooting test, recording the average impact point coordinates 1; 6) Loosen the nut, tilt the gun 90° to the right, tighten the nut, and install the gun in place; 7) Adjust the test bench so that the center of the sight is aligned with the aiming point set on the target paper; conduct a shooting test and record the average impact point coordinates 2; 8) Half the height difference between coordinate 2 and coordinate 1 is the deflection value of the firearm under test at that shooting distance.

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