A method for detecting a barrel diameter

Abstract

The present application relates to the field of artillery detection, and particularly relates to a gun barrel diameter detection method, which comprises the following steps: S1, adjusting the angle of the gun barrel to make the gun barrel horizontally arranged; S2, installing an artillery inner diameter detector; S3, collecting the axial displacement length of the jackscrew through the displacement sensor and the inclination sensor, and calculating and processing the axial displacement length to obtain the artillery inner diameter at the corresponding position; S4, pushing the detector along the axial direction of the artillery through the push rod, recording the inner diameter at each position of the artillery, and displaying the record in real time through the display module. The present application greatly improves the measurement accuracy of the gun barrel diameter, and has high measurement efficiency.

Description

Technical Field

[0001] This invention relates to the field of artillery testing, specifically a method for testing the diameter of artillery barrels. Background Technology

[0002] Artillery is the main combat equipment of the army, and the barrel is the core component of artillery. During firing, the barrel is not only subjected to the impact and chemical effects of high-temperature, high-pressure propellant combustion gases, but also to the friction of high-speed projectiles, resulting in more than a dozen defects. If these defects are not diagnosed and addressed promptly and accurately, they may lead to shell jamming or barrel explosions, significantly impacting the safe use of the artillery. To ensure the safety and accuracy of artillery firing, it is necessary to regularly inspect the condition of the barrel's interior (such as the inner diameter) to determine its quality level.

[0003] Currently, the mainstream method for detecting the diameter of gun barrels is to use laser displacement sensors to measure distance parameters. However, this method requires the laser displacement sensor probe to be positioned very precisely. If the sensor position changes even slightly, the collected data will have a large error, making it impossible to guarantee the accuracy of the measurement. Furthermore, the sensor position needs to be adjusted individually for each installation, which is time-consuming, labor-intensive, and has low measurement efficiency. Therefore, this problem urgently needs to be solved. Summary of the Invention

[0004] To avoid and overcome the technical problems existing in the prior art, this invention provides a method for detecting the diameter of a gun barrel. This invention significantly improves the measurement accuracy of the gun barrel diameter and has high measurement efficiency.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A method for detecting the diameter of a gun barrel includes the following steps:

[0007] S1. Adjust the barrel angle to make the barrel horizontal.

[0008] S2. Install a cannon caliber measuring instrument, which includes a measuring head that can be inserted into the cannon barrel axially. A top column that can move axially within the measuring head is arranged inside the measuring head. A probe that can move radially within the measuring head is also arranged inside the measuring head. One end of the probe abuts against the rifling of the cannon barrel, and the other end of the probe forms a wedge-shaped fit with one end of the top column, so that when the probe moves radially, it can push the top column to move axially along the measuring head. The measuring instrument also includes a fixed tube arranged coaxially with the cannon barrel. The tail end of the top column extends into the fixed tube and connects to a displacement sensor inside the fixed tube. Both the fixed tube and the measuring head are fitted with elastic support rings to provide two-point support for the measuring instrument. The elastic support rings abut against the cannon barrel wall and can slide axially along the cannon barrel. Along the insertion direction of the measuring instrument, a push rod, an inclination sensor, and the fixed tube are arranged coaxially in sequence. A reflector is installed at the end of the measuring head furthest from the fixed tube.

[0009] S3. The axial displacement length of the top column is collected by displacement sensor and tilt sensor, and the inner diameter of the cannon at the corresponding position is obtained after converting the axial displacement length.

[0010] S4. Push the detector along the cannon axis using a push rod to record the inner diameter at various locations inside the cannon and display the record in real time using a display module.

[0011] As a further aspect of the present invention: repeat step S4 at least twice, and end the measurement when the data from two consecutive measurements are the same, and use the set of data as the final detection data.

[0012] As a further aspect of the present invention: in step S1, before the barrel is fixed, the barrel bore wall is purged to complete the pre-cleaning of the barrel bore wall.

[0013] As a further embodiment of the present invention: the elastic support ring has spring pieces arranged along the axial direction of the gun barrel on its ring body, and each spring piece is arranged in a circumferential array along the elastic support ring. The outer ring of the spring piece is provided with a protrusion that abuts against the bore wall of the gun barrel. The spring pieces are arranged to form a columnar receiving cavity for the insertion of the measuring head. A bearing is installed in the receiving cavity to rotate with the measuring head.

[0014] As a further embodiment of the present invention: a first guide cavity is provided axially inside the measuring head, and a top post is installed in the first guide cavity and slides in cooperation with the first guide cavity; a second guide cavity is also provided radially inside the measuring head and communicates with the first guide cavity; the measuring head includes a fixed measuring head and a movable measuring head arranged vertically opposite each other in the second guide cavity; the heads of the fixed measuring head and the movable measuring head abut against the rifling of the gun barrel; the tail of the fixed measuring head avoids the movement trajectory position of the top post; and the tail of the movable measuring head forms a wedge surface cooperation with the top post.

[0015] As a further embodiment of the present invention: a positioning shoulder is provided radially on the top column, and a top column spring is sleeved on the top column. One end of the top column spring abuts against the wall of the first guide cavity, and the other end of the top column spring abuts against the positioning shoulder. The top column spring applies an elastic force to the top column in the direction of the movable probe.

[0016] As a further embodiment of the present invention: the head of the fixed probe is provided with a first arc-shaped head in the shape of an arc surface, and the front end of the first arc-shaped head is provided with a first protrusion; the head of the movable probe is provided with a second arc-shaped head in the shape of an arc surface, and the front end of the second arc-shaped head is provided with a second protrusion, and the first protrusion and the second protrusion abut against the rifling of the gun barrel.

[0017] As a further embodiment of the present invention: the top of the column abuts against the movable probe, the top of the column is spherical, and the tail of the movable probe is a guide slope.

[0018] As a further embodiment of the present invention: a guide groove is provided on the movable probe along the length direction, and a guide post protruding in the second guide cavity is provided to slide in cooperation with the guide groove, thereby limiting the maximum sliding range of the movable probe.

[0019] As a further embodiment of the present invention: the measuring head has a third guide cavity along the radial direction, the positioning post is installed in the third guide cavity and slides in the third guide cavity, the head of the positioning post is provided with a third arc-shaped head that abuts against the inner groove of the gun barrel, a positioning post spring is sleeved on the positioning post, one end of the positioning post spring abuts against the third guide cavity, the other end of the positioning post spring abuts against the third arc-shaped head, and the positioning post spring applies an elastic force to the positioning post in the direction of the inner groove of the gun barrel.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. In this invention, the gun barrel is first placed horizontally, and then the measuring instrument is installed. Due to the wedge-shaped fit between the measuring instrument's probe and the top post, the probe moves radially along the measuring head after contacting the rifling. The probe then pushes the top post axially through the wedge-shaped surface. By measuring the axial displacement distance of the top post, the inner diameter of the gun barrel at a specific location can be calculated, enabling precise measurement of the inner diameter at any position within the gun barrel. Because the measuring head has a rotating elastic support ring that contacts the gun barrel and can slide axially along the barrel, the elastic support ring supports the measuring head as it is pushed axially. At this time, the measuring head rotates along the rifling, while the elastic support ring does not rotate. During this dynamic pushing process, the inner diameter of the rifling at any position within the gun barrel can be measured. The measured data is recorded and displayed in real time by displacement and tilt sensors, achieving dynamic and visual detection of the gun barrel's inner diameter with high measurement accuracy and efficiency. The measurement process ends only when two consecutive measurements are identical, resulting in higher measurement accuracy. Before measurement, the barrel wall is purged to remove residues, which can prevent residues from affecting the detection accuracy. The arrangement of the push rod makes it convenient for the operator to push the detector along the axis.

[0022] 2. The elastic support ring of the present invention is provided with several sets of spring pieces. By the contact between the protrusions on the spring pieces and the gun barrel, it is ensured that the elastic support ring can adapt to gun barrels of different diameters. At the same time, each spring piece can form a cavity for the bearing to be installed in it, which facilitates the rotational engagement of the measuring head with the elastic support ring through the bearing. By arranging a displacement sensor in the fixed tube, the measuring head is arranged coaxially with the fixed tube, and the top column can cooperate with the displacement sensor to obtain measurement data in real time.

[0023] 3. The probe of the present invention consists of a fixed probe and a movable probe arranged in opposition to each other. The distance between the apexes of the two sets of probes is the diameter of the gun barrel. The movable probe serves as the movable end, and its tail forms a wedge-shaped fit with the top column. The arrangement of the first guide cavity and the second guide cavity inside the measuring head can guide and position the movable probe and the top column, facilitating their sliding. A top column spring is installed on the top column. Under the elastic force of the top column spring, the top column can always remain in contact with the movable probe, ensuring accurate measurement.

[0024] 4. The arc-shaped design of the fixed probe and the movable side head of this invention facilitates the passage through the air extraction hole in the gun barrel. The protrusion design on the arc-shaped head is used for point contact measurement, improving measurement accuracy. By connecting the tail end of the top column to the displacement sensor, the axial displacement distance of the top column can be directly obtained through the sensor, further improving measurement accuracy. The sliding fit between the guide groove on the movable probe and the guide column in the second guide cavity can limit the maximum sliding range of the movable probe and prevent the movable probe from coming out of the second guide cavity.

[0025] 5. The design of the two sets of positioning pins in this invention can be inserted into the bore groove of the gun barrel under the elastic force of the positioning pin spring, thereby guiding the measuring head and preventing the measuring head from shifting position during the measurement process. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the cannon inner diameter measuring instrument of the present invention.

[0027] Figure 2 This is a schematic diagram of the measuring head in this invention.

[0028] Figure 3 This is a schematic diagram of the elastic support ring in this invention.

[0029] In the picture:

[0030] 1. Measuring head; 11. Top column; 111. Positioning shoulder; 112. Column head; 113. Top column spring;

[0031] 12. First guide cavity; 13. Fixed probe; 131. First arc-shaped head; 132. First protrusion;

[0032] 14. Movable probe; 141. Second arc-shaped head; 142. Second convex point;

[0033] 143. Guide groove; 144. Guide slope;

[0034] 15. Second guide cavity; 151. Guide post;

[0035] 16. Positioning pin; 161. Third arc-shaped head; 162. Positioning pin spring; 163. Third guide cavity;

[0036] 2. Elastic support ring; 21. Spring piece; 211. Protrusion; 22. Receiving cavity;

[0037] 3. Reflector; 4. Displacement sensor; 5. Fixing tube;

[0038] 6. Tilt sensor; 7. Push rod. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Please see Figures 1-3 In this embodiment of the invention, a method for detecting the diameter of a gun barrel includes the following steps:

[0041] S1. Disassemble the gun barrel and purge the barrel wall to complete the pre-cleaning of the barrel wall. Then adjust the barrel angle to make the barrel horizontal.

[0042] S2. Install the cannon inner diameter measuring instrument, and arrange the measuring head 1 of the measuring instrument coaxially with the cannon barrel;

[0043] S3. The axial displacement length of the top column 11 is collected by the displacement sensor 4 and the tilt sensor 6. The inner diameter of the cannon at the corresponding position is calculated and processed after the axial displacement length is calculated.

[0044] In the specific calculation, trigonometric function conversion is performed based on the slope of guide ramp 144. The conversion process is existing technology, so it will not be described in detail here.

[0045] S4. Push the testing instrument along the cannon axis using push rod 7, record the inner diameter at various locations inside the cannon, and display the records in real time via the display module. This step should be repeated at least twice. The measurement ends when the data from two consecutive measurements are identical, and this set of data is taken as the final test data.

[0046] The detector includes a fixed tube 5, inside which a displacement sensor 4 is installed. The displacement sensor 4 is preferably a GPNL20-20 series spring-loaded displacement sensor. An elastic support ring 2 is fitted on the tube body of the fixed tube 5.

[0047] The elastic support ring 2 includes several sets of spring clips 21 arranged on the ring body. One end of the spring clip 21 adjacent to the barrel wall is provided with a protrusion 211, which abuts against the barrel wall. After the spring clip 21 enters the barrel of different diameters, the spring clip 21 can move up and down elastically to adapt to the barrel of different diameters.

[0048] Multiple sets of spring pieces 21 are arranged in an array along the circumference of the elastic support ring 2. The spring pieces 21 form a columnar receiving cavity 22, which is inserted into one side of the fixed tube 5. A precision needle roller bearing is installed in the receiving cavity 22 of the elastic support ring 2, and the bearing rotates with the fixed tube 5. During the testing operation, the measuring head 1 and the fixed tube 5 rotate within the elastic support ring 2, while the elastic support ring 2 does not rotate.

[0049] The measuring head 1 is cylindrical, with a first guide cavity 12 axially formed inside. A top post 11 is installed inside the first guide cavity 12 and slides within it. A second guide cavity 15 is radially formed in the middle of the measuring head 1, penetrating the measuring head 1. The first guide cavity 12 communicates with the second guide cavity 15. The top post 11 has a radially protruding annular positioning shoulder 111. A top post spring 113 is sleeved on the top post 11, with one end abutting against the first guide cavity 12 and the other end abutting against the positioning shoulder 111. The top post spring 113 applies an elastic force to the top post 11 in the direction of the second guide cavity 15.

[0050] The second guide cavity 15 is divided into two sections by the first guide cavity 12. The upper section of the second guide cavity 15 is provided with a movable probe 14 that slides with the second guide cavity 15, and the lower section of the second guide cavity 15 is provided with a fixed probe 13 that is fixedly connected to the second guide cavity 15.

[0051] The movable probe 14 has a guide groove 143 along the length of the second guide cavity 15. The second guide cavity 15 has a guide post 151 that corresponds to the position of the guide groove 143. The diameter of the guide post 151 matches the width of the guide groove 143 and can slide along the guide groove 143. Thus, the maximum sliding range of the movable probe 14 is limited by the cooperation of the guide post 151 and the guide groove 143.

[0052] Both the movable probe 14 and the fixed probe 13 extend beyond the second guide cavity 15. The movable probe 14 has a first arc-shaped head 131 with an arc surface, and a first protrusion 132 at the center of the first arc-shaped head 131. The fixed probe 13 has a second arc-shaped head 141 with an arc surface, and a second protrusion 142 at the center of the second arc-shaped head 141. The first protrusion 132 and the second protrusion 142 abut against the rifling (grooved or raised) of the gun barrel. The arc-shaped design of the first arc-shaped head 131 and the second arc-shaped head 141 facilitates passage through the vent port inside the barrel, and the first protrusion 132 and the second protrusion 142 are used for point contact measurement of the rifling.

[0053] The top post 11, located within the first guide cavity 12, has a spherical head 112 at one end. The tail of the fixed probe 13 is located within the second guide cavity 15 and is offset from the head 112 of the top post 11. The tail of the movable probe 14 is a guide ramp 144, which abuts against the head 112 of the top post 11. The inclination angle of the guide ramp 144 is preferably 45°. When the movable probe 14 slides along the second guide cavity 15, it pushes the top post 11 to slide along the first guide cavity 12, thereby converting the radial movement of the movable probe 14 into the axial movement of the top post 11. The distance between the head of the movable probe 14 and the head of the fixed probe 13 is the measured inner diameter.

[0054] The measuring head 1 also has two sets of third guide cavities 163 radially arranged. Along the axis of the measuring head 1, the two sets of third guide cavities 163 are staggered. A positioning post 16 is installed within each third guide cavity 163, and the positioning post 16 slides within the third guide cavity 163. The head of the positioning post 16 extends outside the third guide cavity 163, and the head of the positioning post 16 has a third arc-shaped head 161. The third arc-shaped head 161 is similar in shape to the first arc-shaped head 131 and the second arc-shaped head 141, and is used to engage with the bore groove of the gun barrel to position the measuring head 1. A positioning post spring 162 is fitted onto the positioning post 16. One end of the positioning post spring 162 abuts against the third guide cavity 163, and the other end abuts against the third arc-shaped head 161. The positioning post spring 162 applies an elastic force to the positioning post 16 in the direction of the bore groove of the gun barrel. The two sets of third guide cavities 163 are oriented in opposite directions, thus causing the heads of the two sets of positioning posts 16 to be arranged in opposite directions.

[0055] After the measuring head 1 is installed, the tail of its top column 11 extends into the fixed tube 5 and connects to the displacement sensor 4. A set of elastic support rings 2 are also fitted on the measuring head 1. The elastic support rings 2 on the measuring head 1 and the elastic support rings 2 on the fixed tube 5 are the same size and coaxially arranged, thus forming two-point support for the detector. A reflector 3 is fixed to the end of the measuring head 1 away from the fixed tube 5.

[0056] The push rod 7, tilt sensor 6, and fixed tube 5 are arranged coaxially in sequence. The tilt sensor 6 is preferably an HWT905-L type nine-axis high-precision attitude measurement sensor, which rotates in conjunction with the displacement sensor. A control circuit board is arranged inside the tilt sensor 6. The control circuit board is used to perform the following main functions:

[0057] 1. Communicate with the displacement sensor 4 via serial port to read sensor data;

[0058] 2. Communicate with the tilt sensor 6 via serial port to set sensor parameters and read sensor data;

[0059] 3. After processing the data from the two sensors, the data is then sent to the data processing device (laptop) via serial port;

[0060] 3. It serves as a 12VDC power supply, directly powering both sensors.

[0061] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0062] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0063] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0064] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0065] The above description has been given for illustrative and descriptive purposes. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A method for detecting the diameter of a gun barrel, characterized in that, Includes the following steps: S1. Adjust the barrel angle to make the barrel horizontal. S2. Install a cannon caliber measuring instrument, which includes a measuring head (1) that can be inserted into the cannon barrel along the axial direction. A top post (11) that can move along the axial direction of the measuring head (1) is arranged inside the measuring head (1). A probe that can move radially along the measuring head (1) is also arranged inside the measuring head (1). One end of the probe abuts against the rifling of the cannon barrel, and the other end of the probe forms a wedge-shaped fit with one end of the top post (11), so that when the probe moves radially along the measuring head, it can push the top post (11) to move axially along the measuring head. The measuring instrument also includes a fixed part arranged coaxially with the cannon barrel. The tail end of the tube (5) and the top column (11) extends into the fixed tube (5) and is connected to the displacement sensor (4) inside the fixed tube (5); both the fixed tube (5) and the measuring head (1) are fitted with elastic support rings (2) to form two-point support for the detector. The elastic support rings (2) are in contact with the barrel wall and can slide along the barrel axis; along the insertion direction of the detector, the push rod (7), the tilt sensor (6) and the fixed tube (5) are arranged coaxially in sequence, and a reflector (3) is installed at the end of the measuring head (1) away from the fixed tube (5); S3. The axial displacement length of the top column (11) is collected by the displacement sensor (4) and the tilt sensor (6), and the inner diameter of the cannon at the corresponding position is obtained after converting the axial displacement length. S4. Push the detector along the cannon axis using the push rod (7) to record the inner diameter at each position inside the cannon; The elastic support ring (2) has spring pieces (21) arranged along the axial direction of the gun barrel on its ring body. Each spring piece (21) is arranged in a circumferential array along the elastic support ring (2). The outer ring of the spring piece (21) is provided with a protruding head (211) that abuts against the bore wall of the gun barrel. Each spring piece (21) surrounds to form a columnar receiving cavity (22) for the insertion of the measuring head (1). A bearing is installed in the receiving cavity (22) so as to rotate with the measuring head (1). The measuring head (1) has a first guide cavity (12) opened along the axial direction. The top column (11) is installed in the first guide cavity (12) and slides in cooperation with the first guide cavity (12). The measuring head (1) also has a second guide cavity (15) opened along the radial direction and communicates with the first guide cavity (12). The measuring head includes a fixed measuring head (13) and a movable measuring head (14) arranged vertically opposite each other in the second guide cavity (15). The heads of the fixed measuring head (13) and the movable measuring head (14) abut against the rifling of the gun barrel. The tail of the fixed measuring head (13) avoids the movement trajectory position of the top column (11). The tail of the movable measuring head (14) forms a wedge surface cooperation with the top column (11). The measuring head (1) has a third guide cavity (163) radially opened on it. The positioning post (16) is installed in the third guide cavity (163) and slides in cooperation with the third guide cavity (163). The head of the positioning post (16) is provided with a third arc-shaped head (161) that abuts against the inner groove of the gun barrel. A positioning post spring (162) is sleeved on the positioning post (16). One end of the positioning post spring (162) abuts against the third guide cavity (163), and the other end of the positioning post spring (162) abuts against the third arc-shaped head (161). The positioning post spring (162) applies an elastic force to the positioning post (16) in the direction of the inner groove of the gun barrel.

2. The method for detecting the diameter of a gun barrel according to claim 1, characterized in that, Repeat step S4 at least twice. When the data from two consecutive measurements are the same, the measurement ends and the set of data is taken as the final detection data.

3. The method for detecting the diameter of a gun barrel according to claim 1, characterized in that, In step S1, before the barrel is fixed, the barrel bore wall is purged to complete the pre-cleaning of the barrel bore wall.

4. The method for detecting the diameter of a gun barrel according to claim 1, characterized in that, The top post (11) is provided with a positioning shoulder (111) protruding radially, and a top post spring (113) is sleeved on the top post (11). One end of the top post spring (113) abuts against the cavity wall of the first guide cavity (12), and the other end of the top post spring (113) abuts against the positioning shoulder (111). The top post spring (113) applies an elastic force to the top post (11) in the direction of the movable probe (14).

5. The method for detecting the diameter of a gun barrel according to claim 1, characterized in that, The fixed probe (13) has a first arc-shaped head (131) with an arc surface at its head, and a first protrusion (132) at the front end of the first arc-shaped head (131); the movable probe (14) has a second arc-shaped head (141) with an arc surface at its head, and a second protrusion (142) at the front end of the second arc-shaped head (141). The first protrusion (132) and the second protrusion (142) are in contact with the rifling of the gun barrel.

6. The method for detecting the diameter of a gun barrel according to claim 1, characterized in that, The top column (11) has a column head (112) that abuts against the movable probe (14). The column head (112) is spherical, and the tail of the movable probe (14) is a guide slope (144).

7. The method for detecting the diameter of a gun barrel according to claim 1, characterized in that, The movable probe (14) has a guide groove (143) along its length, and a guide post (151) protrudes from the second guide cavity (15) and slides in cooperation with the guide groove (143), thereby limiting the maximum sliding range of the movable probe (14).

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