Optical detection method for missile mark point

Abstract

The invention discloses a missile mark point optical detection method, which is mainly applied to the field of missile assembly and solves the problems of small detection size, complicated process, poor precision, poor universality and the like in the prior art. The system is composed of a steering pentaprism, a visible light zoom lens, a visible light camera, a high-precision rotary table, a Powell prism laser, a precision lifting table, a precision tilting table and the like. The method is characterized in that an optical imaging system and a laser Powell prism system are arranged on two sides of a projectile body for horizontal leveling. The laser Powell prism system outputs line laser for preliminary alignment reference of mark points in the missile assembling and adjusting process, and a 110-degree straight line is generated on a missile body to completely cover the missile mark points; establishing a reference plane by a second point and a fourth point on the left side and a second point (or the fourth point) on the right side; and the steering pentaprism scans and images missile marking points to realize height deviation detection of all the marking points of the missile body relative to the reference surface. The device is mainly applied to detection of missile assembly in the missile assembly process.

Description

(1) Technical Field

[0001] The present invention relates to an optical detection method, and more specifically, it relates to an optical detection method for bullet marking points. (2) Background Art

[0002] The assembly process of the bullet is an important part of the bullet production process and has a wide range of applications in the military field. The assembly process of the bullet needs to ensure high precision so as to ensure the performance and reliability of the missile. During the assembly process, various debugging and calibration are also required, such as the calibration of the guidance system and the debugging of the engine, so as to verify the performance and reliability of the missile. Therefore, the missile assembly process is very important.

[0003] The bullet marking point detection method is a new and effective method to check whether the bullet assembly is qualified. Its basic principle is to arrange bullet marking points on the horizontal two-side surfaces of three key components, namely the head, the middle part, and the tail of the bullet. By detecting the reference points on the bullet surface, a reference plane is established, and then all the remaining bullet marking points are detected to obtain the position deviation between all the marking points and the reference plane, so as to obtain the assembly error results at three positions, namely the head, the middle part, and the tail of the bullet, and complete the detection of the bullet assembly error.

[0004] There are mainly two traditional bullet assembly detection methods. The first one is to use a large-size caliper for bullet detection to detect the key dimensions of the bullet. Although it has a simple structure and certain versatility, its use accuracy is generally average, it can only detect specific dimensions, and the detection process is very cumbersome. Each time the bullet needs to be strictly horizontal during inspection, wasting working hours, and it is not suitable for the efficient and precise bullet assembly production process. The second one is to specially make a high-precision bullet assembly size gauge for a specific bullet model for detection. Generally, it is very large in size, and the manual inspection man-hour input is also large, which is time-consuming and laborious. Moreover, each model needs to be specially customized, and its application range is narrow. In terms of accuracy, if the accuracy is guaranteed to be very high, the size of the gauge is very large, and the processing cost will be very high in terms of processing. If the processing cost is saved, the accuracy requirements cannot be guaranteed. (3) Summary of the Invention

[0005] Based on some problems existing in the above technologies, the present invention proposes an effective optical detection method for bullet marking points, which can play a good role in the bullet assembly process. Compared with the traditional gauge method, it has the advantages of good versatility, relatively small system size, convenient for manual operation, time-saving and labor-saving, and high measurement accuracy.

[0006] The present invention is realized through the following technical solutions:

[0007] At the head, middle and tail of the projectile, projectile marking points are arranged on the horizontal two-side surfaces of three key components. Two sets of scanning optical imaging systems and laser Powell prism systems are respectively arranged on both sides of the projectile, and the systems on both sides are horizontally leveled. After the above preparations and leveling, adjust the precision lifting table and precision tilting table. After the laser Powell prism system is adjusted to the appropriate height and angle, use the line laser and the Powell prism on the line laser to output 110° line laser, so that it completely covers all the marking points of the projectile, which is used as the preliminary alignment reference for projectile assembly. When the projectile is preliminarily assembled and adjusted for alignment, according to the 110° line laser reference, adjust the head, middle and tail of the projectile so that the projectile marking points arranged on the horizontal two-side surfaces of the three components are roughly coincident with the line laser. After the preliminary assembly and adjustment of the projectile are completed, use a high-precision turntable to drive the steering pentaprism to scan the reference marking points of the projectile, namely the second point on the left, the fourth point on the left, the second point (or the fourth point) on the right, to establish a reference plane. Then scan all the remaining projectile marking points, transmit the images to the visible light zoom lens and visible light camera, measure the positions of each projectile marking point and image the positions of each marking point. Since the pentaprism always keeps the reflected light perpendicular, during the scanning and rotation process, the axis jump will not cause the deviation of the horizontal optical axis, so the accuracy of the whole system is greatly improved. Finally, the software outputs the solution to obtain the deviation values of each projectile marking point relative to the reference plane formed by the selected reference points, namely the second point on the left, the fourth point on the left, the second point (or the fourth point) on the right. If the deviation exceeds the standard, the output result indicates that the assembly is unqualified; if it is within the deviation range, the output result indicates that the assembly is qualified, thus completing the detection of the projectile assembly accuracy.

[0008] The advantages of the present invention are as follows:

[0009] 1. The adjustable-height and -angle laser Powell system is adopted, which can emit 110° line laser, completely covering the large-size projectile marking points, suitable for the assembly detection of various types of projectiles, and having a certain universality.

[0010] 2. The optical imaging system with perpendicular optical axis is adopted to image the marking points through the reflection of the steering pentaprism. Since the pentaprism always keeps the reflected light perpendicular, during the scanning and rotation process, the axis jump will not cause the deviation of the horizontal optical axis, so the system accuracy is greatly improved.

[0011] 3. The small-field-of-view optical system is adopted to image each marking point on the missile respectively, saving the manual detection cost and improving the accuracy.

[0012] 4. Automatic scanning and imaging, software automatic solution and result analysis, simple operation, greatly saving the labor cost. (4) BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional structure schematic diagram of the two sides of the projectile of the present invention;

[0014] Figure 2 It is a top - down schematic diagram of the marking points of the system structure of the present invention for scanning the bomb;

[0015] Figure 3 It is a schematic diagram of the structure of one set of the system on one side of the present invention;

[0016] Figure 4 It is a cross - sectional view of the structure of the scanning optical imaging system of the present invention;

[0017] Figure 5 It is a schematic diagram of the principle that the steering prism keeps the reflected light perpendicular, and during the scanning rotation process, the axis jump will not cause the deviation of the horizontal optical axis;

[0018] Figure 6 It is a schematic diagram of the analysis interface of the system software.

[0019] Reference numerals in the drawings

[0020] In the figure: 1 - Laser Powell prism system; 2 - Precision lifting table; 3 - Precision tilting table; 4 - Powell prism laser; 5 - Scanning optical imaging system; 6 - Steering pentaprism; 7 - High - precision turntable; 8 - Visible light zoom lens; 9 - Visible light camera. (V) Specific implementation method

[0021] The optical detection system for the bomb marking points mainly includes a steering laser Powell prism system (1) and a scanning optical imaging system (5). Among them, the laser Powell prism system (1) includes a precision lifting table (2), a precision tilting table (3), and a Powell prism laser (4), and the scanning optical imaging system (5) includes a steering pentaprism (6), a high - precision turntable (7), a visible light zoom lens (8), and a visible light camera (9).

[0022] The following further describes the present invention in detail in combination with the drawings and specific implementation methods:

[0023] Figure 1 A three - dimensional structure diagram showing the arrangement of the optical detection system for the marking points on both sides of the bomb and leveling the two - side systems is presented.

[0024] Figure 2 A top - down schematic diagram of scanning the bomb marking points is presented.

[0025] Figure 3 In it, the laser Powell prism system (1) outputs line laser for the preliminary alignment reference during the bomb body assembly and adjustment. Specifically, the Powell prism laser (4) is adjusted by using the precision lifting table (2) and the precision tilting table (3) to make it a 110° laser straight line on the bomb body, which can completely cover the large - size bomb body marking points.

[0026] Figure 4After the initial alignment and adjustment are completed, the scanning optical imaging system (5) performs marker point scanning imaging to detect the assembly error of the projectile. Specifically, the second point from the left, the fourth point from the left, and the second point (or the fourth point) from the right of the projectile are selected to establish a reference plane. The high-precision turntable (7) drives the steering prism (6) to scan the marker points on the projectile, measure the positions of each marker point on the projectile, and image the positions of all the marker points on the projectile through the small-field optical system composed of the visible light zoom lens (8) and the visible light camera (9) to improve the detection accuracy. The height deviation of all the marker points on the projectile relative to the established reference plane is detected, thereby completing the detection of the assembly error of the projectile.

[0027] Figure 5 The principle diagram showing that the steering pentaprism maintains perpendicular reflection of light rays and the axis jump during the scanning rotation will not cause horizontal optical axis deviation is presented in [].

[0028] Figure 6 The schematic diagram of the system software analysis interface is presented in []. The second point from the left, the fourth point from the left, and the second point (or the fourth point) from the right are selected to establish a reference plane, and the deviation of each point relative to the reference plane is measured. If the deviation exceeds the range, the assembly is unqualified; if it is within the deviation range, the assembly is qualified.

[0029] The specific implementation plan is as follows:

[0030] Step 1: Marker points are arranged on the horizontal two-side surfaces of the three key components at the head, middle, and tail of the projectile.

[0031] Step 2: Two optical detection systems, namely the laser Powell prism system (1) and the scanning optical imaging system (5), are arranged on both sides of the projectile, and the systems on both sides are leveled.

[0032] Step 3: The laser Powell prism system (1) adjusts the appropriate angle and height through the precision lifting table (2) and the precision tilting table (3), and uses the Powell prism laser (4) to output 110° line laser to the projectile, covering the marker points on the projectile for the preliminary alignment reference of the marker points during the missile assembly process.

[0033] Step 4: Taking the 110° line laser covering the projectile emitted by the laser Powell prism system (1) as the reference line, adjust the head, middle, and tail of the projectile so that the marker points arranged on the horizontal two-side surfaces of the three components are roughly coincident with the line laser, and complete the preliminary alignment and adjustment of the projectile assembly.

[0034] Step 5: After the preliminary assembly and adjustment are completed, select the second point on the left side, the fourth point on the left side, and the second point (or the fourth point) on the right side of the projectile body as the reference points. The scanning optical imaging system (5) drives the deflecting pentaprism (6) through the high-precision turntable (7) to scan the second point on the left side, the fourth point on the left side, and the second point (or the fourth point) on the right side, and measure the positions of the reference points, namely the second point on the left side, the fourth point on the left side, and the second point (or the fourth point) on the right side.

[0035] Step 6: The scanning optical imaging system (5) forms an image of the positions of the second point on the left side, the fourth point on the left side, and the second point (or the fourth point) on the right side of the projectile body through the small-field-of-view optical system composed of the visible light zoom lens (8) and the visible light camera (9), and constructs a reference plane.

[0036] Step 7: The scanning optical imaging system (5) drives the deflecting pentaprism (6) through the high-precision turntable (7) to scan all the remaining projectile body marking points, and measure the positions of each projectile body marking point.

[0037] Step 8: The scanning optical imaging system (5) forms an image of the positions of all the remaining marking points on the projectile body through the small-field-of-view optical system composed of the visible light zoom lens (8) and the visible light camera (9), improves the detection accuracy, and realizes the detection of the height deviation of all the marking points on the projectile body relative to the already established reference plane.

[0038] Step 9: The system software analyzes and automatically displays the deviation of each marking point relative to the reference plane. If the deviation exceeds the range, the assembly is unqualified; if it is within the deviation range, the assembly is qualified, and the detection of the assembly error of the projectile body is completed.

[0039] The above has introduced in detail a method for optical detection of projectile marking points provided by the present invention. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The above-mentioned is only the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present invention, several improvements and deformations can still be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. An optical detection method for bullet marking points, characterized in that, Two sets of scanning optical imaging systems (5) and Powell prism systems (1) are respectively arranged on both sides of the projectile body, and the systems on both sides are horizontally leveled.

2. An optical detection method for bullet marking points, characterized in that, The height and inclination of the laser Powell prism system (1) are adjusted by using a precision lifting table (2) and a precision tilting table (3). The output line laser can generate a straight line within a range of 110° on the projectile body, covering all the marked points on the projectile body, which is used as a preliminary alignment reference for the marked points during the missile assembly and adjustment process.

3. An optical detection method for bullet marking points, characterized in that, A reference plane is established by taking the second point on the left side, the fourth point on the left side, and the second point (or the fourth point) on the right side of the projectile body.

4. An optical detection method for bullet marking points, characterized in that, A high-precision turntable (7) is used to drive the steering pentaprism (6) to rotate around the vertical optical axis for scanning to measure all the marked points on the projectile body.

5. An optical detection method for bullet marking points, characterized in that, The positions of all the marked points on the projectile body measured by scanning are respectively imaged by a small-field optical system composed of a visible light zoom lens (8) and a visible light camera (9), so as to improve the detection accuracy and realize the detection of the height deviation of all the marked points on the projectile body relative to the established reference plane.

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