A device for testing the symmetry of a grain

Abstract

The application provides a device for testing the symmetry of a charge column, and aims at solving the problem of large test error in the prior art. The device can effectively, safely and intuitively test the symmetry of an EFP warhead. The device comprises a flat plate, a gasket, a bolt, a positioning seat, a bearing, a positioning platform, a base, a ring wedge and a gland. The flat plate has a hole in the center. The ring wedge and the inner diameter of the base are used to reliably fix the main charge column with a cover, so as to ensure that the main charge column with the cover is coaxial with the base and the positioning seat. The symmetry of the main charge column with the cover is measured by using a dial gauge, and the coaxial error is obtained by calculating the distance from the center of the circle to the reference axis. The device has a simple structure and solves the problems of large test error and low safety in the prior art.

Description

Technical Field

[0001] The present invention relates to the assembly of an explosively formed projectile (EFP) warhead in a smart ammunition, and belongs to the technical field of internal charge testing during the assembly process of an EFP warhead. It also relates to a device for testing the symmetry of a charge. Background Art

[0002] The EFP warhead is the core component of smart ammunition. For the aerodynamic structure of the EFP warhead, even slight asymmetry in the structure will cause unstable flight of the EFP, and in severe cases, it will cause rolling. During the assembly of the EFP warhead, the symmetry requirements of the grain are extremely strict, so testing the symmetry of the grain is of great significance to the development of the EFP warhead.

[0003] Disadvantages of traditional technology:

[0004] The current testing during the assembly process cannot ensure that the grain is coaxial with the test platform, and cannot accurately test the symmetry of the grain. Summary of the Invention

[0005] The present invention aims to solve the problem of large test errors in existing technologies and provides a device for testing the symmetry of a charge. The device can effectively, safely and intuitively test the symmetry of an EFP warhead.

[0006] The technical solution of the present invention is a device for testing the symmetry of a drug column, characterized in that it includes a plate, a gasket, a bolt, a positioning seat, a bearing, a positioning platform, a base, a ring wedge, and a pressure cover; there is a hole in the center of the plate, and the positioning seat is fixed to the plate through the hole; the positioning seat is a stepped shaft structure as a whole, with thin shafts at both ends and a platform structure with a larger diameter in the middle, and the lower side shaft passes through the center hole of the plate and has a threaded hole structure; the bolt passes through the gasket to connect the positioning seat; the outer diameter of the gasket is larger than the diameter of the center hole of the plate; the bearing is installed in the upper end shaft of the positioning seat, and the inner diameter of the bearing matches the positioning platform; The positioning platform is an annular structure, and its inner diameter matches the outer diameter of the bearing; the base is fixed on the positioning platform, and the base acts as a guide and is used to connect the covered main charge and the positioning platform; the bottom plane of the base fits tightly with the upper plane of the positioning platform, and there is a through hole on the lower end face of the base for placing the raised part of the bottom of the covered main charge; the ring wedge has two half grooves and one through groove; the ring wedge is placed between the base and the covered main charge; the pressure cover is pressed on the ring wedge; under the action of the pressure cover, the ring wedge fits tightly with the covered main charge and the base, so that the covered main charge fits tightly, and the covered main charge is coaxial with the base and the positioning platform.

[0007] The beneficial effects of the present invention are: overcoming the deficiencies of the prior art, providing a device suitable for testing the symmetry of an EFP warhead, having a simple structure, and solving the problems of large test errors and low safety in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 A top view of the ring wedge 10;

[0009] Figure 2 It is a front view of the ring wedge 10;

[0010] Figure 3 This is the main view of the base 8;

[0011] Figure 4 This is a cross-sectional view of the device used to test the symmetry of the grain.

[0012] In the figure, 1-foot, 2-plate, 3-gasket, 4-bolt, 5-positioning seat, 6-bearing, 7-positioning platform, 8-base, 9-main charge with cover, 10-ring wedge, 11-pressure cover. DETAILED DESCRIPTION

[0013] A device for testing the symmetry of a charge, characterized by comprising a plate 2, a gasket 3, a bolt 4, a positioning seat 5, a bearing 6, a positioning platform 7, a base 8, a ring wedge 10, and a pressure cover 11;

[0014] There is a hole in the center of the plate 2, through which the positioning seat 5 is fixed to the plate 6; the positioning seat 5 is a stepped shaft structure as a whole, with thin shafts at both ends and a platform structure with a larger diameter in the middle. The lower shaft passes through the center hole of the plate 6 and has a threaded hole structure; the bolt 9 passes through the gasket 8 and connects to the positioning seat 5; the outer diameter of the gasket is larger than the diameter of the center hole of the plate 2; the bearing 6 is installed on the upper end shaft of the positioning seat 5, and the inner diameter of the bearing 6 matches the positioning platform; the positioning platform 7 is an annular structure, and its inner diameter matches the outer diameter of the bearing 6;

[0015] The base 8 is fixed on the positioning platform 7. The base 8 plays a guiding role and is used to connect the covered main charge 9 and the positioning platform 7. The bottom plane of the base 8 is closely fitted with the upper plane of the positioning platform 7. The lower end surface of the base 8 has a through hole for accommodating the raised part of the bottom of the covered main charge.

[0016] The ring wedge 10 has two half grooves and one through groove; the ring wedge 10 is placed between the base 8 and the covered main charge 9;

[0017] The pressure cover 11 is pressed on the ring wedge 10; under the action of the pressure cover 11, the ring wedge 10 is tightly fitted with the covered main powder column 9 and the base 8, so that the lower end surface of the covered main powder column 9 is tightly fitted with the base 8, and the covered main powder column 9 is coaxial with the base 8 and the positioning platform 7.

[0018] Furthermore, the device for testing the symmetry of a charge of the present invention is mainly composed of a foot 1, a plate 2, a gasket 3, a bolt 4, a positioning seat 5, a bearing 6, a positioning platform 7, a base 8, a main charge with a cover 9, a ring wedge 10, and a pressure cover 11.

[0019] It also includes footings 1. Two footings 1 are screwed to the corresponding positions of the flat plate 2. There are four threaded holes at the corners of the flat plate 2, which can be used to install four footings 1, so that the flat plate 2 can be placed stably and reliably on the operating table.

[0020] There is a hole in the center of the plate 2, and the positioning seat 5 can be fixed on the plate 2 through the hole; the positioning seat 5 is a stepped shaft structure as a whole, with thin shafts at both ends and a platform structure with a larger diameter in the middle. One side shaft passes through the center hole of the plate 2, and the middle positioning seat structure fits with the plate 2. The positioning seat 5 passes through the lower side end of the plate 2 and has a threaded hole structure.

[0021] The bolt 4 passes through the gasket 3 and cooperates with the threaded hole at the lower end of the plate 2. The positioning seat 5 is fixed to the plate 2. The gasket 3 is an annular structure. Its outer diameter should be larger than the diameter of the center hole of the plate 2, and its inner diameter is smaller than the head of the bolt 4.

[0022] The positioning seat 5 is reliably connected to the plate 2 through the gasket 3 and the bolt 4. The bearing 6 is installed in the other end of the positioning seat 5. The inner diameter of the bearing 6 matches the other end of the positioning seat 5. The positioning platform 7 is connected to the bearing 6. The positioning platform 7 is an annular structure, and its inner diameter matches the outer diameter of the bearing 6.

[0023] The positioning seat 5, the bearing 6 and the positioning platform 7 cooperate tightly and firmly and are used to rotate the covered main charge 9 and test the symmetry of the covered main charge 9.

[0024] The base 8 is fixed on the positioning platform 7. The base 8 plays a guiding role and is used to connect the covered main powder column 9 and the positioning platform 7. The bottom plane of the base 8 is tightly fitted with the upper plane of the positioning platform 7. There is a through hole on the lower end surface of the base 8 for placing the raised part at the bottom of the covered main powder column 9.

[0025] The ring wedge 10 is placed between the base 8 and the covered main charge 9 , and the pressure cover 11 is on the ring wedge 10 for pressing the ring wedge 10 .

[0026] The ring wedge 10 has two half grooves with half height and a through groove. Under the action of the pressure cover 11, the ring wedge 10 fits tightly with the covered main powder column 9 and the base 8, thereby ensuring that the lower end surface of the covered main powder column 9 fits tightly with the base 8 under the action of the ring wedge 10, which is used to ensure the coaxiality of the covered main powder column 9, the base 8 and the positioning platform 7.

[0027] During assembly, first place the base 8 on the positioning platform 7, then install the covered main powder column 9 into the base 8 and install it in place, place the ring wedge 10 between the base 8 and the covered main powder column 9, and use force to tightly fit the pressure cover 1 on the ring wedge 2. At this time, the covered main powder column 9 is coaxial with the base 8 and the positioning seat 5.

[0028] Place the magnetic meter stand and dial indicator on the upper plane of the plate 2. Taking the upper plane of the plate 2 as the reference, first use the dial indicator to self-check the base 8. After the circular runout of the base 8 is qualified, adjust the magnetic meter stand and the dial indicator needle to point vertically to the surface of the detection position of the covered powder column. Manually adjust the positioning platform 7. The positioning platform 7 rotates freely and the swing difference measurement can be carried out.

[0029] The principle of the present invention is:

[0030] The shrouded main charge is reliably fixed by the ring wedge and the inner diameter of the base, ensuring that the shrouded main charge is coaxial with the base and the positioning seat. The symmetry of the shrouded main charge is measured with a dial indicator, that is, the coaxiality error (circular runout) is calculated by calculating the distance from the center of the circle to the reference axis.

[0031] The method of using the present invention:

[0032] First, tighten the foot 1 to the corresponding position of the plate 2. Secure the positioning seat 5 to the plate 2 using the gasket 3 and bolts 4. Secure the bearing 6 to the positioning seat 5 via the inner diameter of the bearing 6 (interference fit), ensuring that the lower plane of the bearing 6 is in contact with the axis of the positioning seat 5. Secure the positioning platform 7 to the bearing 6 via the outer diameter of the bearing 6 (interference fit), ensuring that the parallelism of the upper plane of the positioning platform 7 and the plate is less than 0.02mm. Place the base 8 on the positioning platform 7, install the covered main drug column 9 into the base 8 and install it in place. Place the ring wedge 10 between the base 8 and the covered main drug column 9, and press the pressure cover 11 firmly to make it fit tightly on the ring wedge 10. At this time, the covered main drug column 9 is coaxial with the inner diameter of the base 8. Place the magnetic meter stand and dial indicator on the upper surface of the plate 2. Using the upper surface of the plate 2 as a reference, use a dial indicator to self-check the base 8. Touch the dial indicator needle to the outer surface of the base 8. Rotate the positioning platform 7. Only after the circular runout of the base 8 is qualified can the symmetry test of the covered main charge 9 be carried out. Remove the gland 11, place the magnetic meter stand and dial indicator on the upper surface of the plate 2. Using the upper surface of the plate 2 as a reference, adjust the magnetic meter stand and dial indicator needle to point vertically towards the covered main charge 9. The circular runout, i.e., symmetry, of the covered main charge 9 can be determined.

[0033] This method can safely and effectively test the symmetry of the EFP warhead and directly and accurately reflect the quality problems of the warhead under the assembly requirements.

[0034] The present invention can be extended and applied to symmetry testing of other types of EFP warheads.

Claims

1. A device for testing the symmetry of a drug column, characterized in that: It includes a flat plate (2), a gasket (3), a bolt (4), a positioning seat (5), a bearing (6), a positioning platform (7), a base (8), a ring wedge (10), and a pressure cover (11); There is a hole in the center of the plate (2), and the positioning seat (5) passes through the hole and is fixed on the plate (2); the positioning seat (5) is a stepped shaft structure as a whole, with thin shafts at both ends and a platform structure with a larger diameter in the middle, and the lower side shaft passes through the center hole of the plate (2) and has a threaded hole structure; the bolt (4) passes through the gasket (3) and connects the positioning seat (5); the outer diameter of the gasket is larger than the diameter of the center hole of the plate (2); the bearing (6) is installed in the upper end shaft of the positioning seat (5), and the inner diameter of the bearing (6) matches the positioning platform; the positioning platform (7) is an annular structure, and its inner diameter matches the outer diameter of the bearing (6); The base (8) is fixed on the positioning platform (7), and the base (8) plays a guiding role and is used to connect the covered main powder column (9) and the positioning platform (7); the bottom plane of the base (8) is closely fitted with the upper plane of the positioning platform (7), and the lower end surface of the base (8) has a through hole for accommodating the raised part of the bottom of the covered main powder column; The ring wedge (10) has two half grooves and one through groove; the ring wedge (10) is placed between the base (8) and the covered main charge column (9); The pressure cover (11) is pressed on the ring wedge (10); under the action of the pressure cover (11), the ring wedge (10) is tightly fitted to the main medicine column with a cover (9) and the base (8), so that the lower end surface of the main medicine column with a cover (9) is tightly fitted to the base (8), and the main medicine column with a cover (9) is coaxial with the base (8) and the positioning platform (7); the magnetic meter frame and the dial indicator are placed on the upper plane of the flat plate, and the magnetic meter frame and the dial indicator needle are adjusted to point vertically to the main medicine column with a reference to the upper plane of the flat plate, so that the circular runout of the main medicine column with a cover can be obtained.

2. The device for testing the symmetry of a drug column according to claim 1, characterized in that: It also includes footings; wherein, two footings are screwed to corresponding positions of the plate.

3. The device for testing the symmetry of a drug column according to claim 1, characterized in that: There are 4 threaded holes at the corners of the tablet, which can be used to install 4 feet, so that the tablet can be placed stably and reliably on the operating table.

4. The device for testing the symmetry of a drug column according to claim 1, characterized in that: Place the magnetic table stand and dial indicator on the flat surface of the plate, using the flat surface as a reference.

5. The device for testing the symmetry of a drug charge according to claim 4, characterized in that: First, the base (8) is self-checked with a dial indicator. After the circular runout of the base (8) is qualified, the magnetic meter frame and the dial indicator needle are adjusted to vertically point to the detection position surface of the covered powder column. The positioning platform (7) is manually adjusted. The positioning platform (7) rotates freely and the swing difference measurement can be performed.

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