A multi-purpose device for positioning and detecting the thickness of a shell and a method of use

Abstract

The application provides a multi-purpose device suitable for shell wall thickness positioning detection and a use method. The device comprises a measuring device (100) and a positioning device (200), which are horizontally connected and assembled through a base (101), so that the positioning detection function is realized. The application solves the problems of nondestructive testing of special-shaped shell wall thickness, large occupied area and high cost. The application has low cost, small occupied area, nondestructive testing, high interchangeability of parts, effectively reduced cost, effectively simplified operation process, improved work efficiency, reduced resource waste and greatly reduced measurement cost.

Description

Technical Field

[0001] This invention relates to a multi-purpose device and method for detecting the thickness of cartridge cases, belonging to the field of mechanical manufacturing technology. Background Technology

[0002] In the ammunition manufacturing process, the thickness of the cartridge case wall directly affects the ammunition's firing safety, internal pressure resistance, and ballistic performance. Inaccurate cartridge case wall thickness machining can lead to barrel explosion or flight deviation. Therefore, there is an urgent need to design a multi-purpose device and method for measuring and locating cartridge case wall thickness.

[0003] In bullet manufacturing technology, traditional inspection methods use tools such as micrometers and calipers, which are inefficient and difficult to detect internal wall thickness. Existing technology uses image measuring instruments to detect wall thickness, but this device requires damaging the product structure, which is costly, space-consuming, and inefficient. This device can detect wall thickness at multiple points and distances, which is highly efficient, accurate, and stable.

[0004] This invention proposes a multi-purpose device and method for detecting cartridge case wall thickness, which solves the problems of inaccurate multi-point measurement positioning, low efficiency, and difficulty in detecting internal wall thickness caused by traditional calipers and micrometers. This device solves the problem of inaccurate multi-point measurement positioning, has high reliability, and improves work efficiency. Traditional image measuring instruments require damaging the product structure, occupy a large area, and are costly to measure wall thickness. In contrast, the device proposed in this application is low-cost, occupies a small area, and allows for non-destructive testing, effectively simplifying the operation process, improving work efficiency, reducing resource waste, and significantly lowering measurement costs. Summary of the Invention

[0005] The technical problem of this invention is: Problem 1: Traditional measurement methods are inaccurate in multi-point measurement and positioning, have low efficiency, and are difficult to detect internal wall thickness.

[0006] Question 2: Image measuring instruments damage the product structure, occupy a large area, and are costly when measuring wall thickness.

[0007] The purpose of this invention is: To address the above issues, a multi-purpose device for determining the thickness of cartridge cases and its usage method were designed. This device enables non-destructive testing of the wall thickness at multiple points and distances, while simultaneously solving the problem of inaccurate positioning in multi-point measurements. It offers high reliability, improves work efficiency, and reduces resource waste.

[0008] The technical solution of this invention is: On one hand, this invention proposes a multi-purpose device for positioning and detecting the thickness of cartridge cases, comprising: a measuring device (100) and a positioning device (200), which are horizontally connected and assembled via a base (101) to achieve the positioning and detection function, wherein: The measuring device (100) includes: a base (101), a long nut (102), a washer (103), a nut (104), a support (105), a dial indicator rod (106), a fastening screw sleeve (107), a fastening screw (108), a dial indicator (109), a fastening nut (110), a screw (111), a chuck (112), a measuring rod (113), and a measuring head (114), wherein: The support column (105) is connected and assembled to the left end of the base (101) via a long nut (102), a washer (103), and a nut (104). The measuring rod (113) is connected and assembled to the bottom of the support column (105) via a chuck (112). The measuring head (114) is connected to the right end of the measuring rod (113) via a thread. The gauge rod (106) is connected and assembled to the top of the support column (105) via a fastening screw sleeve (107), a fastening screw (108), and a fastening nut (110). The dial indicator (109) is connected and assembled to the open through hole at the right end of the gauge rod (106) via a screw (111). The positioning device (200) includes: a positioning fork (201), a rotating shaft (202), a support rod (203), a washer (204), a screw (205), and a rotating base (206), wherein: The swivel (206) is connected and assembled to the right end of the base (101) via a long nut (102), a washer (103), and a nut (104). The rotating shaft (202) is connected to the top of the swivel (206) with clearance fit. The support rod (203) is connected to the side of the rotating shaft (202) via a thread. The positioning fork (201) is connected to the threaded hole of the support rod (203) via a washer (204) and a screw (205).

[0009] On the other hand, the present invention proposes a method for detecting the thickness of a cartridge case, which includes the following steps: S1, the support column (105) in the measuring device (100) is connected and assembled to the left end of the base (101) by a long nut (102), a washer (103), and a nut (104). The measuring rod (113) is connected and assembled to the bottom of the support column (105) by a chuck (112). The measuring head (114) is connected to the right end of the measuring rod (113) by a thread. The dial indicator (106) is connected and assembled to the top of the support column (105) by a fastening screw sleeve (107), a fastening screw (108), and a fastening nut (110). The dial indicator (109) is connected and assembled to the open through hole at the right end of the dial indicator (106) by a screw (111).

[0010] S2, the rotating seat (206) in the positioning device (200) is connected and assembled to the right end of the base (101) through a long nut (102), a washer (103), and a nut (104). The rotating shaft (202) is connected to the top of the rotating seat (206) with clearance fit. The support rod (203) is connected to the side of the rotating shaft (202) through a thread. The positioning fork (201) is connected to the threaded hole of the support rod (203) through a washer (204) and a screw (205).

[0011] S3, adjust the measuring device (100), adjust the lever (106), dial indicator (109), measuring rod (113), align the measuring head (114) and the tip of the dial indicator (109) coaxially, and according to different measurement positions (i.e., cartridge case opening, cartridge case bottom, cartridge case shoulder), the positioning device (200) replaces and installs the positioning fork (201) and support rod (203) of the corresponding size.

[0012] S4. During measurement, the center line of the measuring rod (113) and the center point of the positioning fork (201) are adjusted to the same horizontal position, and the measuring head (114) and the tip of the dial indicator (109) are aligned coaxially. Then, the bottom groove of the cartridge case is placed on the positioning fork (201), and the mouth is placed on the measuring rod (113). The reading is displayed by the dial indicator (109), and the wall thickness measurement at one point is completed. When the cartridge case needs to be measured at different positions, the different positions of the positioning fork (201) are switched by rotating the shaft (202), and the wall thickness of the mouth, bottom, and shoulder of the cartridge case is measured according to the above detection steps.

[0013] The advantages and beneficial effects of this invention are: The present invention aims to design a multi-purpose device for positioning and detecting the thickness of cartridge cases. By designing positioning forks (201) of different heights and support rods (203) of different lengths, the two are used together to measure the thickness of cartridge cases of different calibers at multiple points. This solves the problems of inaccurate positioning, low efficiency and difficulty in detecting internal wall thickness in traditional measurement methods, effectively simplifies the operation process and improves work efficiency. By designing a stepped long-arm cylindrical measuring rod (113) and a detachable measuring head (114), and simultaneously rounding the inner side of the positioning fork (201) with a radius of 2, the surface of the cartridge case is not scratched during measurement. This solves the problems of thick wall, large footprint, and high cost in non-destructive testing of irregularly shaped cartridge cases. In addition, the parts are highly interchangeable, effectively reducing costs and resource waste, and has great practical application value.

[0014] Compared with the use of traditional calipers, micrometers, and image measuring instruments, this invention can non-destructively test the thickness of cartridge case walls at different locations. A dedicated measuring head (114) is used for measuring the thickness of the cartridge case wall in concave-convex annular cartridge cases, improving accuracy. For wall thickness measurements at different distances, a rotatable positioning fork (201), support rods (203) of different lengths, and a rotating shaft (202) and a rotating base (206) are used in conjunction, enabling multi-point and multi-distance wall thickness measurements to be completed on a single device. This effectively simplifies the operation process, improves work efficiency, significantly reduces processing costs, and solves the problem of inaccurate positioning in multi-point measurements. It has high reliability and significant practical application value. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of a multi-purpose device for positioning and detecting cartridge case wall thickness according to the present invention; Figure 2 This is a schematic diagram of the base of the present invention; Figure 3 This is a schematic diagram of the long nut of the present invention; Figure 4 This is a schematic diagram of washer 1 of the present invention; Figure 5 This is a schematic diagram of the nut of the present invention; Figure 6 This is a schematic diagram of the support pillar of the present invention; Figures 7(a) and (b) are schematic diagrams of the measuring rod structure and cross-section of the measuring device of the present invention, respectively. Figure 8 This is a schematic diagram of the fastening screw sleeve of the present invention; Figure 9 This is a schematic diagram of the fastening screw of the present invention; Figure 10 This is a schematic diagram of the fastening nut of the present invention; Figure 11 This is a schematic diagram of the chuck of the present invention; Figure 12 This is a schematic diagram of the measuring rod of the measuring device of the present invention; Figure 13 This is a schematic diagram of the measuring head of the measuring device of the present invention; Figure 14 This is a schematic diagram of the positioning fork of the positioning device of the present invention; Figures 15(a) and (b) are the rotating shaft structure and cross-sectional schematic diagram of the positioning device of the present invention, respectively; Figure 16 This is a schematic diagram of the support rod of the positioning device of the present invention; Figure 17 This is a schematic diagram of the positioning device rotating base of the present invention; Figure 18 This is a schematic diagram of an embodiment of the multi-purpose device for measuring the wall thickness of a cartridge case according to the present invention; Wherein: the measuring device (100) includes: 101 base, 102 long nut, 103 washer, 104 nut, 105 support, 106 gauge rod, 107 fastening screw sleeve, 108 fastening screw, 109 dial indicator, 110 fastening nut, 111 screw, 112 chuck, 113 measuring rod, 114 measuring head. The positioning device (200) includes: 201 positioning fork, 202 rotating shaft, 203 support rod, 204 washer, 205 screw, and 206 rotatable seat. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, 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.

[0018] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited in each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] This invention relates to a multi-purpose device and method for detecting cartridge case wall thickness. During the ammunition manufacturing process, cartridge case wall thickness directly affects the ammunition's firing safety, internal pressure resistance, and ballistic performance. Inaccurate cartridge case wall thickness processing may lead to barrel explosion or flight deviation.

[0020] Example 1: Please also refer to Figures 1-17 , Figure 1 This is a schematic diagram of the structure of a multi-purpose device for positioning and detecting cartridge case wall thickness according to the present invention. (Refer to...) Figure 1 It includes a measuring device (100) and a positioning device (200), which are horizontally connected and assembled through a base (101) to achieve the positioning and detection function.

[0021] The measuring device (100) includes a base (101), a long nut (102), a washer (103), a nut (104), a support (105), a gauge rod (106), a fastening screw sleeve (107), a fastening screw (108), a dial indicator (109), a fastening nut (110), a screw (111), a chuck (112), a measuring rod (113), and a measuring head (114).

[0022] The support column (105) is connected and assembled to the left end of the base (101) via a long nut (102), a washer (103), and a nut (104). The measuring rod (113) is connected and assembled to the bottom of the support column (105) via a chuck (112). The measuring head (114) is connected to the right end of the measuring rod (113) via a thread. The gauge rod (106) is connected and assembled to the top of the support column (105) via a fastening screw sleeve (107), a fastening screw (108), and a fastening nut (110). The dial indicator (109) is connected and assembled to the open through hole at the right end of the gauge rod (106) via a screw (111).

[0023] The positioning device (200) includes a positioning fork (201), a rotating shaft (202), a support rod (203), a washer (204), a screw (205), and a rotating seat (206).

[0024] The swivel (206) is connected and assembled to the right end of the base (101) via a long nut (102), a washer (103), and a nut (104). The rotating shaft (202) is connected to the top of the swivel (206) with clearance fit. The support rod (203) is connected to the side of the rotating shaft (202) via a thread. The positioning fork (201) is connected to the threaded hole of the support rod (203) via a washer (204) and a screw (205).

[0025] Figure 2 This is a schematic diagram of the structure of a multi-purpose device base (101) for measuring the thickness of cartridge casings. The base (101) is a trapezoidal structure with an irregular inner groove, made of 45# steel. The inner groove is designed as a convex slide structure, which facilitates the horizontal adjustment of the measuring device (100) and the positioning device (200). The trapezoidal structure is designed as an arc shape. Through optimized grip structure and oxidation treatment, it achieves labor-saving and anti-slip effects.

[0026] Figure 3This is a schematic diagram of the structure of a long nut (102) for a multi-purpose device for positioning and detecting cartridge wall thickness according to the present invention. The long nut (102) is a convex cuboid structure made of 45# steel. The height of the boss is designed to be lower than the height of the convex slide inside the base (101), so that the long nut (102) can be placed in the convex slide inside the base (101). The boss of the long nut (102) is designed to be longer, which increases the support structure. The height of the boss is designed to be lower than the height of the inner groove inside the base (101), which together ensures the perpendicularity of the two sides of the long nut (102) to the bottom surface of the convex slide after it is assembled to the base (101).

[0027] Figure 4 This is a schematic diagram of the structure of a gasket (103) for a multi-purpose device for positioning and detecting the wall thickness of a cartridge case according to the present invention. The gasket (103) is a circular structure with a certain thickness and is made of 45# steel. After oxidation treatment, it can provide a uniform and stable coefficient of friction and gap compensation, ensuring that the threaded connection between the nut (104) and the long nut (102) is reliable. At the same time, it serves as a "sacrificial part" to protect the more expensive base (101) and the surface of the nut (104) base from wear.

[0028] Figure 5 This is a schematic diagram of the structure of a nut (104) for a multi-purpose device for positioning and detecting the wall thickness of a cartridge case according to the present invention. The nut (104) is made of 45# steel. The upper disc diameter is larger than the lower disc diameter in the design, and the surface of the upper disc is textured to increase the frictional resistance when loading and unloading the support column (105). The nut (104) has a groove design in the middle to facilitate installation and disassembly.

[0029] Figure 6 This is a schematic diagram of the structure of a support column (105) of a multi-purpose device for positioning and detecting the wall thickness of a cartridge case according to the present invention. The support column (105) is a cylindrical structure made of 45# steel. The entire surface is subjected to oxidation treatment and heat treatment. The heat treatment hardness is controlled between 47HRC and 52HRC to eliminate internal stress, improve strength and corrosion resistance, and extend service life. The tail end is designed with a threaded structure to facilitate installation on the base (101), and a pre-reserved empty tool groove is provided at the end of the thread to improve processing accuracy and efficiency.

[0030] Figures 7(a) and (b) are schematic diagrams of the measuring rod structure and cross-section of the measuring device of the present invention, respectively. The measuring rod (106) is made of 45# steel and is shaped as a multi-hole long-arm cylinder. The right end is designed with an open through hole. By adjusting the size of the opening, the clamping degree of the dial indicator (109) can be adjusted, and the position of the dial indicator can be finely adjusted up and down during measurement. The left side of the open through hole of the measuring rod (106) is designed with an M6 semi-threaded through hole. The diameter of the unthreaded cylinder on the upper end face of the thread is designed to be Φ6.1mm, which is slightly larger than the diameter of the threaded through hole, making it easier to install the screw (111). The long arm design increases stability.

[0031] Figure 8 This is a schematic diagram of the structure of a fastening screw sleeve (107) of a multi-purpose device for positioning and detecting the wall thickness of a cartridge case according to the present invention. The fastening screw sleeve (107) is a through-hole U-shaped groove, made of 45# steel, and has a certain thickness. When assembled into the through hole of the fastening screw (108), it can effectively disperse the force at the through hole of the fastening screw (108), reduce local stress concentration, and prevent it from cracking or deforming. The surface is oxidized to improve corrosion resistance.

[0032] Figure 9 This is a schematic diagram of the structure of a fastening screw (108) for a multi-purpose device for positioning and detecting cartridge case wall thickness according to the present invention. The fastening screw (108) is a T-shaped cylindrical structure made of 45# steel. The head is designed as a through hole that cooperates with the fastening screw sleeve (107) to fix the dial indicator (106). The tail of the fastening screw (108) is a semi-threaded design. The length of the unthreaded cylinder is the same as the length of the through hole of the collet (112). The two are fixed on the support column (105) in cooperation with the fastening nut (110) and the collet (112). The surface of the fastening screw (108) is subjected to oxidation treatment and heat treatment to eliminate internal stress, improve strength and corrosion resistance, and extend service life.

[0033] Figure 10 This is a schematic diagram of the structure of a fastening nut (110) of a multi-purpose device for positioning and detecting cartridge case wall thickness according to the present invention. The fastening nut (110) is a stepped circular nut made of 45# steel. The sub-stepped structure provides better gripping and contact area, making it easy to install and remove with the fastening screw (108).

[0034] Figure 11 This is a schematic diagram of the structure of a multi-purpose chuck (112) for positioning and detecting cartridge case wall thickness according to the present invention. The chuck (112) is a U-shaped multi-hole structure made of 45# steel and is used to fix a dial indicator (109) to a support column (105). The left side is designed with a longitudinal open through hole with a certain width, which facilitates the installation of the chuck (112) onto the support column (105). The right end is designed with a transverse through hole, which cooperates with the fastening screw sleeve (107), fastening screw (108), and fastening nut (110) to fix it onto the support column (105).

[0035] Figure 12This is a schematic diagram of the measuring rod (113) of a multi-purpose device for positioning and detecting the thickness of cartridge case walls according to the present invention. The measuring rod (113) is the core component of the present invention. It is a stepped long-arm cylindrical structure. The long arm design can measure the thickness of the bottom wall of the cartridge case. The diameter of the tail cylinder of the measuring rod (113) is larger than that of the tip cylinder, with a smooth transition in the middle. The large diameter of the tail cylinder can increase the stability during measurement and enhance the strength of the measuring rod (113). The small diameter of the tip cylinder makes it easier for the measuring rod (113) to be placed into the mouth of the cartridge case during measurement, avoiding damage to the cartridge case. The measuring rod (113) is made of T10A steel and is heat-treated and chrome-plated to improve the hardness and gloss of the measuring rod (113) and enhance its corrosion resistance and wear resistance.

[0036] Figure 13 This is a schematic diagram of the structure of a measuring head (114) of a multi-purpose device for positioning and detecting the thickness of cartridge casings according to the present invention. The measuring head (114) is the core component of the present invention. It is shaped like an irregular cone structure with a small flat head to reduce the contact area during measurement and ensure measurement accuracy. Both sides of the cone are flat-cut to facilitate the attachment and detachment of the measuring rod (113). During measurement, the measuring head (114) contacts the cartridge casing and is prone to wear. The bottom thread design facilitates local replacement during measurement when connected to the measuring rod (113), reducing costs. The measuring head (114) is made of T10A steel and undergoes heat treatment. The cone is chrome-plated to improve hardness and enhance wear resistance.

[0037] Figure 14 This is a schematic diagram of the positioning fork (201) of a multi-purpose device for measuring the wall thickness of a cartridge case according to the present invention. The positioning fork (201) is the core component of the present invention. It is made of T10A steel and has a semi-circular plate shape. The detachable design facilitates replacement when measuring different positions. The semi-circular plate shape enhances the stability of contact with the bottom groove of the cartridge case during measurement, reducing measurement errors and costs. The rounded corners on both ends prevent scratching the surface of the cartridge case during measurement. The positioning fork (201) is designed with three sets of heights according to the different measurement points of the cartridge case, which are distinguished by marking. It measures the wall thickness at the bottom, mouth, and shoulder of the cartridge case. If the wrong positioning fork (201) is selected due to carelessness in marking, the data will be inaccurate or there will be no data displayed.

[0038] Figures 15(a) and (b) are schematic diagrams of the rotating shaft structure and cross-section of the positioning device of the present invention, respectively. The rotating shaft (202) is made of T10A steel and is designed as a symmetrical hexagonal disk structure. An M6 thread is provided at every 120° position on the side, which is connected to the support rod (203) and then cooperates with the positioning fork (201) to measure the wall thickness of the bottom, mouth and shoulder of the cartridge case. The cylinder designed at the bottom of the rotating shaft (202) is fitted with the rotating seat (203) with a clearance to realize the rotation function, which is convenient for adjusting different measurement positions.

[0039] Figure 16This is a schematic diagram of the structure of a support rod (203) of a multi-purpose device for positioning and detecting the wall thickness of a cartridge case according to the present invention. The support rod (203) is the core component of the present invention. It is made of T10A steel and has a threaded structure at both ends. Different lengths are designed according to the position of the cartridge case measurement point and are distinguished by marking. If the wrong support rod (203) is selected when measuring different positions, the measurement position will be inaccurate. Washers (204), screws (205) and positioning forks (201) are used to fix the connection. The positioning forks (201) are matched and used according to different measurement positions.

[0040] Figure 17 This is a schematic diagram of the structure of a multi-purpose rotating base (206) for cartridge case wall thickness positioning and detection according to the present invention. The rotating base (206) is made of T10A steel and has a cylindrical symmetrical structure. The upper cylinder has a built-in circular hole and is rounded to facilitate the rotation function by clearance fit with the bottom cylinder of the rotating shaft (202). A pre-reserved empty tool groove is reserved at the bottom M10 thread to improve machining accuracy and efficiency. The rotating base (206) is designed as a trapezoidal cylindrical structure and is chamfered to provide better gripping and contact area, which facilitates installation and disassembly with the long nut (102). The rotating base (206) is heat-treated to eliminate internal stress, improve strength, and extend service life.

[0041] Example 2: Please also refer to Figure 18 , Figure 18 This is a schematic diagram of an embodiment of a multi-purpose device for measuring the wall thickness of cartridge cases according to the present invention. Its multi-purpose feature lies in that it can measure the wall thickness of cartridge cases of different calibers and lengths by adjusting the dimensions of the positioning fork (201) and the support rod (203), thereby satisfying the measurement needs of cartridge cases of different calibers and positions. The device features strong interchangeability of parts, is suitable for cartridge cases of various calibers, is simple to operate, improves work efficiency, and is economical. In this embodiment, the cartridge case caliber is 12.7mm, and the specific detection method includes the following steps: Step 1, S1, the support column (105) in the measuring device (100) is connected and assembled to the left end of the base (101) through the long nut (102), washer (103), and nut (104). The measuring rod (113) is connected and assembled to the bottom of the support column (105) through the chuck (112). The measuring head (114) is connected to the right end of the measuring rod (113) through the thread. The dial indicator (106) is connected and assembled to the top of the support column (105) through the fastening screw sleeve (107), fastening screw (108), and fastening nut (110). The dial indicator (109) is connected and assembled to the open through hole at the right end of the dial indicator (106) through the screw (111).

[0042] Step 2, S2, the rotating seat (206) in the positioning device (200) is connected and assembled to the right end of the base (101) through a long nut (102), a washer (103), and a nut (104). The rotating shaft (202) is connected to the top of the rotating seat (206) with clearance fit. The support rod (203) is connected to the side of the rotating shaft (202) through a thread. The positioning fork (201) is connected to the threaded hole of the support rod (203) through a washer (204) and a screw (205).

[0043] Step 3, S3, adjust the measuring device (100), by adjusting the dial indicator (106), dial indicator (109), and measuring rod (113), align the measuring head (114) and the tip of the dial indicator (109) coaxially, and according to different measurement positions (i.e., the mouth of the cartridge case, the bottom of the cartridge case, and the shoulder of the cartridge case), the positioning device (200) replaces and installs the positioning fork (201) and support rod (203) of the corresponding size.

[0044] Step 4, S4, during measurement, adjust the center line of the measuring rod (113) and the center point of the positioning fork (201) to the same horizontal position, and ensure that the measuring head (114) and the tip of the dial indicator (109) are coaxially aligned. Then, the bottom groove of the cartridge case is placed on the positioning fork (201), and the mouth is placed on the measuring rod (113). The reading is displayed by the dial indicator (109), thus completing the wall thickness measurement at one point. When the cartridge case needs to be measured at different positions, the different positions of the positioning fork (201) are switched by rotating the shaft (202), and the wall thickness of the mouth, bottom, and shoulder of the cartridge case is measured according to the above detection steps.

[0045] It should be noted that the above process operations can be combined to varying degrees. For the sake of brevity, the implementation methods of various combinations will not be elaborated here. Those skilled in the art can flexibly adjust the order of the above operation steps or flexibly combine the above steps according to actual needs.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should be covered within the protection scope of the present invention.

Claims

1. A multi-purpose device for positioning and detecting cartridge case wall thickness, characterized in that, include: The measuring device (100) and the positioning device (200) are horizontally connected and assembled via a base (101) to achieve the positioning and detection function, wherein: The measuring device (100) includes: a base (101), a long nut (102), a washer (103), a nut (104), a support (105), a dial indicator rod (106), a fastening screw sleeve (107), a fastening screw (108), a dial indicator (109), a fastening nut (110), a screw (111), a chuck (112), a measuring rod (113), and a measuring head (114), wherein: The support column (105) is connected and assembled to the left end of the base (101) via a long nut (102), a washer (103), and a nut (104). The measuring rod (113) is connected and assembled to the bottom of the support column (105) via a chuck (112). The measuring head (114) is connected to the right end of the measuring rod (113) via a thread. The gauge rod (106) is connected and assembled to the top of the support column (105) via a fastening screw sleeve (107), a fastening screw (108), and a fastening nut (110). The dial indicator (109) is connected and assembled to the open through hole at the right end of the gauge rod (106) via a screw (111). The positioning device (200) includes: a positioning fork (201), a rotating shaft (202), a support rod (203), a washer (204), a screw (205), and a rotating base (206), wherein: The swivel (206) is connected and assembled to the right end of the base (101) via a long nut (102), a washer (103), and a nut (104). The rotating shaft (202) is connected to the top of the swivel (206) with clearance fit. The support rod (203) is connected to the side of the rotating shaft (202) via a thread. The positioning fork (201) is connected to the threaded hole of the support rod (203) via a washer (204) and a screw (205).

2. The apparatus according to claim 1, characterized in that, in: The measuring rod (113) is a stepped long-arm cylindrical structure. The long arm design can measure the bottom wall thickness of the cartridge case. The diameter of the tail cylinder of the measuring rod (113) is larger than that of the tip cylinder, with a smooth transition in the middle. The large diameter of the tail cylinder can increase the stability during measurement and enhance the strength of the measuring rod (113). The small diameter of the tip cylinder makes it easier for the measuring rod (113) to be placed into the mouth of the cartridge case during measurement, avoiding damage to the cartridge case. The measuring rod (113) is made of T10A steel and is heat-treated and chrome-plated to improve the hardness and gloss of the measuring rod (113) and enhance its corrosion resistance and wear resistance.

3. The apparatus according to claim 1, characterized in that, in: The measuring head (114) is shaped like an irregular cone with a small flat head to reduce the contact area during measurement and ensure measurement accuracy. Both sides of the cone are flat-cut for easy attachment and disassembly with the measuring rod (113). During measurement, the measuring head (114) contacts the cartridge case and is prone to wear. The bottom thread design facilitates local replacement during measurement when connected to the measuring rod (113), reducing costs. The measuring head (114) is made of T10A steel and undergoes heat treatment. The cone is chrome-plated to improve hardness and enhance wear resistance.

4. The apparatus according to claim 1, characterized in that, in: The positioning fork (201) is designed in a semi-circular arc shape, and its detachable design makes it easy to replace when measuring different positions; the semi-circular arc shape enhances the stability of contact with the bottom groove of the cartridge case during measurement, reducing measurement errors and costs; the rounded corners on both ends prevent scratching the surface of the cartridge case during measurement. The positioning fork (201) is designed with three sets of heights according to the different measurement points of the cartridge case. It is distinguished by marking. The wall thickness at the bottom, mouth and shoulder of the cartridge case is measured to avoid inaccurate data or no data display if the wrong positioning fork (201) is selected due to carelessness in marking.

5. The apparatus according to claim 1, characterized in that, in: Both ends of the support rod (203) are designed with threaded structures. Different lengths are designed according to the position of the cartridge case measurement point and are distinguished by marking. If the wrong support rod (203) is selected when measuring different positions, the measurement position will be inaccurate. Washers (204), screws (205) and positioning forks (201) are used to fix the connection. The positioning forks (201) are matched and used according to different measurement positions.

6. The apparatus according to claim 1, characterized in that, in: The rotating base (206) has a cylindrical symmetrical structure with a built-in circular hole at the upper end and rounded corners to facilitate a clearance fit with the bottom cylinder of the rotating shaft (202) to achieve rotation. A pre-reserved empty tool groove is provided at the M10 thread at the bottom end to improve machining accuracy and efficiency. The rotating base (206) is designed as a trapezoidal cylindrical structure with chamfering to provide better gripping and contact area, making it easy to install and disassemble with the long nut (102). The rotating base (206) is heat-treated to eliminate internal stress, improve strength, and extend service life.

7. The apparatus according to claim 1, characterized in that, in: The base (101) is a trapezoidal structure with an irregular inner groove, made of 45# steel. The inner groove is designed as a convex slide structure, which facilitates the horizontal position adjustment of the measuring device (100) and the positioning device (200). The outer part of the trapezoidal structure is designed as an arc shape. Through optimized grip structure and oxidation treatment, it achieves labor-saving and anti-slip effects.

8. The apparatus according to claim 1, characterized in that, in: By designing positioning forks (201) of different heights and support rods (203) of different lengths, the two are used together to measure the wall thickness of multiple points of cartridge cases of different calibers. This solves the problems of inaccurate positioning, low efficiency and difficulty in detecting internal wall thickness in traditional measurement methods, effectively simplifies the operation process and improves work efficiency.

9. The apparatus according to claims 1-8, characterized in that, in: By designing a stepped long-arm cylindrical measuring rod (113) and a detachable measuring head (114), and simultaneously rounding the inner side of the positioning fork (201) with an R2 radius, the problem of scratching the surface of the cartridge case during measurement is avoided. This solves the problems of thick wall, large footprint, and high cost in non-destructive testing of irregularly shaped cartridge cases, and also ensures strong interchangeability of parts.

10. A method for detecting the thickness of a cartridge case wall, comprising using a multi-purpose device for detecting the thickness of a cartridge case wall as described in any one of claims 1-9, characterized in that, The detection method includes the following steps: S1, the support column (105) in the measuring device (100) is connected and assembled to the left end of the base (101) by a long nut (102), a washer (103), and a nut (104). The measuring rod (113) is connected and assembled to the bottom of the support column (105) by a chuck (112). The measuring head (114) is connected to the right end of the measuring rod (113) by a thread. The dial indicator (106) is connected and assembled to the top of the support column (105) by a fastening screw sleeve (107), a fastening screw (108), and a fastening nut (110). The dial indicator (109) is connected and assembled to the open through hole at the right end of the dial indicator (106) by a screw (111). 11.S2, the rotating seat (206) in the positioning device (200) is connected and assembled to the right end of the base (101) by a long nut (102), a washer (103), and a nut (104). The rotating shaft (202) is connected to the top of the rotating seat (206) with clearance fit. The support rod (203) is connected to the side of the rotating shaft (202) by thread. The positioning fork (201) is connected to the threaded hole of the support rod (203) by a washer (204) and a screw (205). 12.S3, Adjust the measuring device (100), by adjusting the dial indicator (106), dial indicator (109), and measuring rod (113), align the measuring head (114) and the tip of the dial indicator (109) coaxially, and according to different measurement positions (i.e., the mouth of the cartridge case, the bottom of the cartridge case, and the shoulder of the cartridge case), replace and install the positioning fork (201) and support rod (203) of the corresponding size in the positioning device (200). 13.S4 During measurement, the center line of the measuring rod (113) and the center point of the positioning fork (201) are adjusted to the same horizontal position, and the measuring head (114) and the tip of the dial indicator (109) are aligned coaxially. Then, the bottom groove of the cartridge case is placed on the positioning fork (201), and the mouth is placed on the measuring rod (113). The reading is displayed by the dial indicator (109), and the wall thickness measurement at one point is completed. When the cartridge case needs to be measured at different positions, the different positions of the positioning fork (201) are switched by rotating the shaft (202), and the wall thickness of the mouth, bottom, and shoulder of the cartridge case is measured according to the above detection steps.

Images