Method for measuring horizontal distance from rotation center of artillery to trunnion center of artillery

Abstract

The invention discloses a method for measuring the horizontal distance from the rotation center of an artillery to the center of an artillery trunnion, and relates to the field of artillery static detection, in particular to a method for measuring the horizontal distance between space axes, when the centers of the two ends of the artillery trunnion and the rotation center of the artillery cannot be vertical to the ground, another reference steel ruler is selected to be used; a theodolite is used for determining the reading of a vertical line of the center positions of the trunnions at the two ends on the steel plate ruler, the numerical value of a connecting line of the centers of the two trunnions on the steel plate ruler is calculated through a trigonometric function, and the horizontal distance from the rotation center of the artillery to the center of the trunnions of the artillery is obtained by adding the radius length of the artillery seat ring. Compared with the prior art, the method has the advantages that (1) the theodolite and the plumb bob are adopted to assist in reading, so that the field operation is simple; (2) by measuring the length parameter, no angle parameter participates in calculation, the error source is few, the application formula is simple, and the measurement precision is effectively ensured;

Description

Technical Field

[0001] The invention relates to the field of static detection of artillery, and in particular to a method for measuring the horizontal distance from a rotation center of an artillery to a center of an artillery trunnion. Background Art

[0002] The horizontal distance from the gun's rotation center to the trunnion center is used as a measured parameter during range identification and firing table tests to check the degree of deviation between the gun's actual state and design indicators.

[0003] After inquiry, similar methods for measuring the horizontal distance from the rotation center of the gun to the center of the gun trunnion are: a gun rotation radius and elevation radius detection device and method based on laser radar (invention patent number: ZL20141053373.4), a gun elevation radius measurement method, device and system based on a dual theodolite (invention patent number: ZL201410821709.8), etc. The detection process and operation of the above detection method are relatively cumbersome, and the measurement equipment must be reasonably arranged to determine the horizontal position of the cooperative target and the cylindrical generatrix of the gun barrel, which belongs to an indirect measurement method. At present, no simpler and more practical detection method has been found to measure the horizontal distance from the rotation center of the gun to the center of the gun trunnion. Summary of the invention

[0004] The purpose of the present invention is to provide a method for measuring the horizontal distance from the rotation center of a gun to the center of a gun trunnion, so that the operation method is simple, convenient and efficient, and the measurement accuracy can be guaranteed.

[0005] In order to solve the above technical problems, the present invention provides a technical solution: a method for measuring the horizontal distance from the rotation center of a gun to the center of a gun trunnion, comprising the following steps:

[0006] Step 1: Carry out measurement when the gun is in combat status and the hull and gun trunnion are leveled;

[0007] Step 2: When the centers of both ends of the gun trunnion and the gun rotation center cannot be plumb to the ground, draw plumb lines at the centers of both ends of the gun trunnion, and place the theodolite as close to the plumb plane formed by the two plumb lines as possible, so that personnel can see the vertices of the two plumb lines through the preliminarily leveled theodolite;

[0008] Step 3: After accurately leveling the theodolite, place a steel ruler horizontally along the barrel direction, with the starting end of the steel ruler against the edge of the gun's rotating seat ring;

[0009] Step 4: Use the horizontal scale in the theodolite eyepiece to help adjust the horizontality of the steel ruler, and use two plumb bobs to help adjust the verticality of the steel ruler and the trunnion. Aim the theodolite to read the values ​​a1 and a2 of the plumb lines at the center of the two ends of the gun trunnion on the steel ruler.

[0010] Step 5. Use a steel tape measure to measure the circumference b of the artillery's rotating seat ring. According to the circumference formula b=2πr, the radius of the rotating seat ring is r=b / 2π.

[0011] Furthermore, in step four, in order to improve the measurement accuracy, the theodolite is adjusted to be infinitely close to the plumb plane formed by the plumb lines hanging from the centers of the two ends of the gun ear axis, and the distance from the plumb line of the ear axis on one side is equal to the distance between the two measuring plumb lines, then the horizontal distance from the outer edge of the slewing seat ring to the ear axis is a=a1+2(a2-a1) / 3.

[0012] Furthermore, in step five, since b, a1 and a2 are measured values, the horizontal distance from the gun rotation center to the gun ear axis center is obtained as c=a+r=a1+2(a2-a1) / 3+b / 2π.

[0013] Compared with the prior art, the advantages of the present invention are: (1) the use of a theodolite and a plumb bob to assist in reading, which makes on-site operation simple; (2) by measuring the length parameter, no angle parameter is involved in the calculation, there are fewer error sources, the application formula is simple, and the measurement accuracy is effectively guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of a method for measuring the horizontal distance from the center of rotation of a gun to the center of the gun's trunnion. DETAILED DESCRIPTION

[0015] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0016] Embodiment 1

[0017] like Figure 1As shown, this embodiment provides a method for measuring the horizontal distance from the center of rotation of a gun to the center of the gun trunnion, and the equipment involved in the measurement includes a theodolite, a tape measure, a steel ruler, and a plumb bob. When the centers of both ends of the gun trunnion and the center of rotation of the gun cannot be plumb to the ground, the gun body is leveled and the gun trunnion is adjusted to a level before measurement. A measuring plumb line is drawn from the centers of both ends of the gun trunnion, so that the theodolite is placed as close to the plumb plane formed by the two plumb lines as possible, that is, the surveyor can see the top of the two plumb lines or the plumb bob through the preliminarily leveled theodolite. After the theodolite is completely leveled, a steel ruler is placed horizontally along the direction of the barrel, and the starting end of the steel ruler is against the edge of the gun swivel seat ring. The horizontal scale of the leveled theodolite is used to assist in adjusting the horizontality of the steel ruler, and the verticality of the steel ruler and the trunnion is adjusted by the plumb bob, and then the steel ruler is fixed. Use the theodolite to aim at the plumb lines drawn from the centers of both ends of the gun trunnion, adjust the theodolite eyepiece, and read the value on the steel ruler corresponding to the plumb bob. To improve the measurement accuracy, adjust the theodolite to be infinitely close to the plumb plane formed by the two plumb lines measured from the two ends of the gun trunnion, and the distance from the plumb line at the center of the trunnion on the near side is equal to the vertical distance between the two plumb lines, then a = a1 + 2 (a2-a1) / 3. Use a steel tape measure to measure the circumference b of the gun's rotating seat ring, and calculate the radius r = b / 2π. Since b, a1 and a2 are measured values, the horizontal distance from the gun's rotating center to the gun's trunnion center c = a + r = a1 + 2 (a2-a1) / 3 + b / 2π can be directly obtained.

[0018] Embodiment 2

[0019] Based on the first embodiment, Figure 1As shown, from the top view schematic diagram, after the gun body is leveled and the gun trunnion is adjusted to be horizontal, the gun barrel 1 can rotate horizontally around the rotation center O' of the horizontal rotation seat ring 2, and at the same time, the gun barrel 1 can also perform elevation and pitch rotation around the trunnion axis determined by the center A of the exposed gun trunnion 3 and the center B of the gun trunnion 4. Plumb bob 5 is dropped through the center point A, and the vertex of plumb bob 5 is point C; similarly, plumb bob 6 is dropped through the center point B, and the vertex of plumb bob 6 is point D; plumb bob 7 and plumb bob 8 are dropped through the center of the gun breech and the center of the barrel, respectively. Measure the horizontal distance between CD as d, and set up the theodolite 10 at the position where the horizontal distance d from the vertex D is, and the center position of the theodolite is point E, so that DE = d. Make point E as close to the vertical plane determined by plumb bob 5 and plumb bob 6 as possible. The erected theodolite 10 can see the vertex C of the plumb bob 5, the vertex D of the plumb bob 6, and the positions of the scale lines F and G on the steel ruler 9 that pass through these two points. Because CD = DE, then ∠DCE = ∠DEC, ∠GDO = 2∠DCE, that is, β = 2α. OG = DOtanβ, OF = COtanα. Practice has shown that if β and α are both small enough (approximately 4' to 10' in actual application), tanβ≈2tanα from β = 2α. And because CO = DO, it can be concluded that GO = 2FO. The "0" scale position on the steel ruler is against the H point on the edge of the rotating seat ring. After the theodolite 10 is completely leveled, with the help of the theodolite eyepiece, the steel ruler can be accurately placed horizontally; the center line of the steel ruler coincides with the vertices of the plumb bob 7 and the plumb bob 8, ensuring that the steel ruler can be accurately located on the plumb plane where the axis of the gun barrel is located, and is perpendicular to the center line connecting the two trunnions of the gun. As can be seen from the figure, the scale value of point O is the horizontal distance from the outer edge of the slewing ring to the center of the gun trunnion. The crosshairs of the theodolite 10 eyepiece pass through the vertex C of the plumb bob 5, and the digital scale corresponding to point G on the steel ruler 9 is read as a1. The crosshairs of the theodolite 10 eyepiece pass through the vertex D of the plumb bob 6, and the digital scale corresponding to point F on the steel ruler 9 is read as a2. Since GO = 2FO, OH = a = a1 + 2 (a2-a1) / 3. The circumference of the slewing ring 2 is measured with a steel tape measure as b, and the radius of the slewing ring is obtained from the circumference formula. HO' = r = b / 2π. From this, the horizontal distance from the slewing center of the gun to the center of the gun trunnion can be obtained, that is, the distance from point O to point O'OO' = O'H + OH = b / 2π + a1 + 2 (a2-a1) / 3.

[0020] Embodiment 3

[0021] On the basis of the first and second embodiments, Figure 1As shown, in the specific implementation of this scheme, in order to ensure the accuracy of measurement, the gun is leveled before measurement to keep the gun's slewing seat and ear shaft horizontal. Four plumb bobs are prepared, two of which determine the exact center position of the two ends of the ear shaft and plumb; the other two plumb bobs determine the plumb plane of the gun barrel and the center position of the breech, respectively, to assist in adjusting the horizontal position of the steel ruler. The theodolite is used to assist in determining the height of the steel ruler, and then the theodolite is adjusted to be as close to the plumb plane formed by plumb bobs 5 and 6 as possible, so that the measurement result is more accurate.

[0022] The above shows and describes the basic principles and main features of the present invention and the advantages of the invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for measuring the horizontal distance from the rotation center of a gun to the center of the gun trunnion, characterized in that The following steps are involved: Step 1: Carry out measurement when the gun is in combat status and the hull and gun trunnion are leveled; Step 2: When the centers of both ends of the gun trunnion and the gun rotation center cannot be plumb to the ground, draw plumb lines at the centers of both ends of the gun trunnion, and place the theodolite as close to the plumb plane formed by the two plumb lines as possible, so that personnel can see the vertices of the two plumb lines through the preliminarily leveled theodolite; Step 3: After accurately leveling the theodolite, place a steel ruler horizontally along the barrel direction, with the starting end of the steel ruler against the edge of the gun's rotating seat ring; Step 4: Use the horizontal scale in the theodolite eyepiece to help adjust the horizontality of the steel ruler, and use two plumb bobs to help adjust the verticality of the steel ruler and the trunnion. Aim the theodolite to read the values ​​a1 and a2 of the plumb lines at the center of the two ends of the gun trunnion on the steel ruler. Step 5. Use a steel tape measure to measure the circumference b of the artillery's rotating seat ring. According to the circumference formula b=2πr, the radius of the rotating seat ring is r=b / 2π.

2. A method for measuring the horizontal distance from the rotation center of a gun to the center of the gun trunnion according to claim 1, characterized in that: In step 4, in order to improve the measurement accuracy, the theodolite is adjusted to be infinitely close to the plumb plane formed by the plumb lines hanging from the centers of the two ends of the gun ear axis, and the distance from the plumb line of the ear axis on one side is equal to the distance between the two measuring plumb lines. Then the horizontal distance from the outer edge of the slewing seat ring to the ear axis is a=a1+2(a2-a1) / 3.

3. A method for measuring the horizontal distance from the rotation center of a gun to the center of the gun trunnion according to claim 1, characterized in that: In step five, since b, a1 and a2 are measured values, the horizontal distance from the gun rotation center to the gun ear axis center is obtained as c=a+r=a1+2(a2-a1) / 3+b / 2π.

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