Method for leveling the rotating plane of gun

Abstract

A method for leveling the rotating plane of a cannon belongs to the field of measurement technology. The purpose of the present invention is to use the sum and difference of the gun body elevation angles when the horizontal rotation angles differ as a judgment basis to adjust the corresponding supporting jacks so that the gun body's rotating plane is horizontal. The steps of the present invention are: the test gun enters the designated inspection area, and four four-point support points are set; the leveling accuracy is set; and the jacks at the four points are supported and fixed to ensure that the gun body is level. The present invention is not affected by the structure of the gun itself and is applicable to the leveling of various types of guns.

Description

Technical Field

[0001] The invention belongs to the technical field of measurement. Background Art

[0002] The gun's rotation plane is a plane perpendicular to the gun's rotation axis. Leveling the gun's rotation plane means adjusting the gun's rotation axis to a vertical position. During gun inspection, gun leveling is a measurement condition for numerous test items, such as the gun's rotation radius, turret rotation damping coefficient, gun adjustment accuracy, alignment between the horizontal platform and the gun axis, horizontal bore threading, sight offset, and gun deflection angle. Therefore, improving the accuracy of gun leveling is of practical significance to gun testing and evaluation.

[0003] Gun leveling is typically performed using the turret's horizontal and vertical leveling platforms, or using a leveling bubble on the turret. However, there are two issues: 1) the leveling platform (or leveling bubble) is not completely parallel to the rotational plane; and 2) some gun leveling bubbles lack a horizontal leveling platform, only a vertical leveling platform for measuring gun elevation. This undoubtedly makes leveling the gun's rotational plane difficult, hindering the implementation of related inspection projects. Summary of the Invention

[0004] The purpose of the present invention is to use the sum and difference of the gun body elevation angles when the horizontal rotation angles differ as a judgment basis to adjust the corresponding supporting jacks to make the gun rotation plane horizontal.

[0005] The steps of the present invention are:

[0006] S1. The gun under test enters the designated testing area and sets four support points at points P1, P2, P3, and P4.

[0007] S2, set the leveling accuracy σ to 1';

[0008] S3. Support the jacks at points P1, P2, P3, and P4 and keep them secure to make the gun barrel level.

[0009] S4. Place the quadrant on the gun body platform and close to the longitudinal scale on the gun body platform. Measure the corresponding elevation angles when the gun body points to points P1, P2, P3, and P4 respectively.

[0010] S5. Calculate the minimum elevation angle according to formula (1)

[0011]

[0012] S6. Calculate half the difference between the two groups of readings with a horizontal rotation angle difference of 180° according to formula (2), which are β u1 and βu2 ;

[0013]

[0014] S7. Calculate half of the sum of the two groups of readings with a 180° difference in the horizontal rotation angle of the gun according to formula (3), which are γ u1 with γ u2 ;

[0015]

[0016] S8. According to formula (4), the quadrant installation angle γ is obtained u ;

[0017] γ u =max(γ u1 ,γ u2 ) (4)

[0018] S9, when |β u1 |>σ or |β u2 When |>σ, the gun is rotated so that the barrel points to the minimum elevation angle The corresponding position, and press γ u The size of the fixed quadrant;

[0019] S10, minimum elevation angle The jacks are positioned in the corresponding positions to make the quadrant bubble level;

[0020] S11, repeat S4 to S10 until |β u1 |≤σ and |β u2 When |≤σ, leveling is completed.

[0021] The present invention is not affected by the structure of the artillery itself and is suitable for leveling various types of artillery. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the four-point support of a certain artillery piece;

[0023] Figure 2 It is a flow chart of the implementation of the present invention. DETAILED DESCRIPTION

[0024] The invention measures the gun body elevation angles at four positions where the horizontal rotation angles of the gun differ by 90 degrees, and uses the sum and difference of the gun body elevation angles when the horizontal rotation angles differ by 180 degrees as a judgment basis to adjust the corresponding supporting jacks to make the gun rotation plane horizontal.

[0025] The steps of the present invention are:

[0026] S1. The gun under test enters the designated detection area and sets four supporting points (e.g., P1, P2, P3, and P4) Figure 1 ).

[0027] S2. Set the leveling accuracy σ to 1' (one sixtieth of a degree, which is relatively high and more accurate. The accuracy can also be reduced according to actual conditions, for example, 5'. That is, the smaller the value, the higher the required accuracy).

[0028] S3. Support the jacks at points P1, P2, P3, and P4 without loosening them, so that the gun barrel is roughly level.

[0029] S4. Place the quadrant on the gun body platform and keep it close to the longitudinal scale line on the gun body platform (the scale line that is consistent with the direction of the gun body). Measure the corresponding elevation angle when the gun body points to point P1, point P2, point P3, and point P4 respectively.

[0030] S5. Calculate the minimum elevation angle according to formula (1)

[0031]

[0032] S6. Calculate half the difference between the two groups of readings with a 180° difference in horizontal rotation angle of the gun according to formula (3), which are β u1 and β u2 ;

[0033]

[0034] S7. Calculate half of the sum of the two groups of readings with a 180° difference in the horizontal rotation angle of the gun according to formula (2), which are γ u1 with γ u2 ;

[0035]

[0036] S8. According to formula (4), the quadrant installation angle γ is obtained u ;

[0037]

[0038] S9, when |β u1 |>σ or |β u2 When |>σ, the gun is rotated so that the barrel points to the minimum elevation angle The corresponding position, and press γ u The size of the quadrant is determined by the size of the quadrant.

[0039] S10, minimum elevation angle Position the jacks accordingly to make the quadrant bubble level.

[0040] S11, repeat S4 to S10 until |β u1 |≤σ and |βu2 When |≤σ, leveling is completed.

[0041] Example:

[0042] Basic conditions: the starting angle between the rotating plane and the horizontal plane β = 2°; the angle between the rotating plane and the horizontal platform γ = 10'; the error σ caused by the inconsistent tightness of the jack support h =1mm; Jack position deviation angle σ ω =1°; gun horizontal rotation angle error σ θ =2°; horizontal platform longitudinal scale error σ η =1°; quadrant placement error σ u =1°; quadrant bubble observation error σ s =10″; quadrant reading error Random sampling m = 100000 times, the average square error of the leveling result is As shown in Table 1.

[0043] Table 1 Leveling results under basic conditions

[0044] Adjustment times / times 0 1 2 3 4 Leveling result / (') 121.18 154.22 72.93 5.04 3.26 Adjustment times / times 5 6 7 8 9 Leveling result / (') 2.71 1.60 0.85 0.72 0.73

[0045] From Table 1, we can see that the general trend is that as the adjustment increases, the mean square error of the leveling results It becomes smaller and eventually stabilizes at around 0.73′ under basic conditions.

[0046] The initial results are It is slightly larger than the initial angle β = 2°, which is due to the support error σ h , position deviation angle σ ω The result after the first adjustment is Significantly greater than the initial results This is because after the first adjustment, the four upper support points changed from being approximately coplanar to being significantly non-coplanar, forming two three-point support planes with significant differences, among which the larger inclination angle increased significantly compared to the initial result.

[0047] Example:

[0048] Taking a certain gun as an embodiment of the present invention, the elevation angle change during the leveling process is shown in Table 2.

[0049] Table 2 Elevation angle changes during leveling

[0050]

[0051] It can be seen from Table 2 that after 3 adjustments Satisfy β u1 |≤1′ and |βu2 |≤1′. If the leveling accuracy σ is set to 1′, the leveling is completed.

Claims

1. A method for leveling a rotating plane of a gun, characterized by: The steps are: S1. The gun under test enters the designated testing area and sets four support points at points P1, P2, P3, and P4. S2, set the leveling accuracy σ to 1'; S3. Support the jacks at points P1, P2, P3, and P4 and keep them secure to make the gun barrel level. S4. Place the quadrant on the gun body platform and close to the longitudinal scale on the gun body platform. Measure the corresponding elevation angles when the gun body points to points P1, P2, P3, and P4 respectively. S5. Calculate the minimum elevation angle according to formula (1) S6. Calculate half the difference between the two groups of readings with a horizontal rotation angle difference of 180° according to formula (2), which are β u1 and β u2 ; S7. Calculate half of the sum of the two groups of readings with a 180° difference in the horizontal rotation angle of the gun according to formula (3), which are γ u1 with γ u2 ; S8. According to formula (4), the quadrant installation angle γ is obtained u ; c u =max(γ u1 ,c u2 ) (4) S9, when |β u1 |>σ or |β u2 When |>σ, the gun is rotated so that the barrel points to the minimum elevation angle The corresponding position, and press γ u The size of the fixed quadrant; S10, minimum elevation angle The jacks are positioned in the corresponding positions to make the quadrant bubble level; S11, repeat S4 to S10 until |β u1 |≤σ and |β u2 When |≤σ, leveling is completed.

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