Explosive bolt three-stress loading ignition test device

Abstract

The utility model belongs to the technical field of initiating explosive device tests, and discloses an explosive bolt three-stress loading ignition test device which comprises a base (1), a loader (2), a pin (3), a target plate (4), a back plate (5), a shear force screw / nut (6), a balance screw / nut (7) and a back plate fastening screw / nut (8). The base (1) is of a T-shaped structure, a through hole is formed in a vertical plate of the base (1), and a screw of the explosive bolt penetrates into the through hole of the vertical plate from the rear side of the vertical plate of the base (1). The back plate (5) is parallel to the vertical plate of the base (1) and is pressed on the rear end face of the explosive bolt, and the back plate (5) and the vertical plate of the base (1) are fixedly arranged through a back plate fastening screw / nut (8). According to the utility model, on the basis of a conventional explosive bolt ignition test device, the loading device is additionally arranged, and the screw / nut standard component is utilized, so that the real simulation of the stress condition of the explosive bolt is simply and economically realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of pyrotechnic device testing, in particular to a three-stress loading ignition testing device for explosive bolts. Background Art

[0002] Explosive bolts are widely used in the aerospace field due to their small size, strong load-bearing capacity, and lack of pollution and debris after use. This is particularly true for separation conditions such as cabin separation, fairing separation, and satellite-rocket separation. Because explosive bolts only work once, their performance is tested by sampling before use. Therefore, the accuracy of the testing method directly determines whether the explosive bolt's true performance indicators are tested, especially the testing of the explosive bolt's ignition function during a single action. The ignition function is tested using a ignition test. During the test, the test state of the explosive bolt should be as consistent as possible with the operating conditions. Therefore, a test device is usually used to simulate the stress conditions of the explosive bolt.

[0003] Conventional testing equipment can only simulate the axial preload of the explosive bolt screw, but cannot simulate other stress conditions. Therefore, there are deviations in the test state of the explosive bolt, and there are deviations between the test results and the performance of the explosive bolt when in use, that is, there are deviations between the ignition performance of the explosive bolt and the actual level. Utility Model Content

[0004] The technical problem to be solved by the utility model is that the ignition test device of the explosive bolt cannot truly simulate the working conditions of the explosive bolt, resulting in a deviation between the ignition performance of the explosive bolt and the actual level.

[0005] In order to solve the above technical problems, the specific technical solutions of the present utility model are as follows:

[0006] A three-stress loading ignition test device for explosive bolts, comprising a base 1, a loader 2, a pin 3, a target plate 4, a back plate 5, a shear force screw / nut 6, a balancing screw / nut 7, and a back plate fastening screw / nut 8;

[0007] The base 1 is a T-shaped structure, and a through hole is provided on its vertical plate. The screw of the explosive bolt passes through the through hole of the vertical plate from the rear side of the vertical plate of the base 1; the back plate 5 is arranged parallel to the vertical plate of the base 1, and is pressed against the rear end surface of the explosive bolt. The back plate 5 and the vertical plate of the base 1 are fixed by the back plate fastening screws / nuts 8;

[0008] The loader 2 is a box-type structure with an opening, and a through hole is provided on the rear side plate thereof for inserting the screw of the explosive bolt; the rear side plate of the loader 2 is in contact with the front side of the vertical plate of the base 1;

[0009] The two side plates of the loader 2 are provided with corresponding through holes, and the shear force screws / nuts 6 and the balance screws / nuts 7 respectively connect the two side plates of the loader 2 to the reinforcement plates at the corresponding positions of the base 1;

[0010] A pin hole is provided on the top plate of the loader 2, and the pin 3 is inserted into the pin hole, and the side wall of the pin 3 fits with the end of the screw of the explosive bolt;

[0011] The target plate 4 is arranged at the front end of the base 1 and has a distance from the end of the explosive bolt screw.

[0012] Furthermore, the bottom plate of the base 1 is rectangular, and a rectangular vertical plate perpendicular to the bottom plate is provided on the top of the bottom plate.

[0013] Furthermore, three horizontal through holes are provided on the vertical plate, including a main through hole and two step holes. The two step holes have the same diameter and are symmetrical about the center of the main through hole.

[0014] Furthermore, a triangular reinforcing plate is provided at each end of the vertical plate and the bottom plate of the base 1. The reinforcing plate acts as a reinforcing rib. A through hole is provided on each reinforcing plate, and the two through holes are coaxial.

[0015] Furthermore, the pin 3 is a copper flat-head nail.

[0016] Furthermore, the pin is clearance-matched with the pin hole of the loader 2 .

[0017] Furthermore, the target plate 4 includes a non-metallic block 401, two copper bars 402, and two cables 403. The two cables 403 are respectively welded to one end of the two copper bars 402. The two copper bars 403 are respectively vertically fixed on both sides of the non-metallic block 401, and the copper bars are higher than the top surface of the non-metallic block.

[0018] Furthermore, the two cables 403 are connected to the electrical signal detector.

[0019] Furthermore, the back plate 5 is a rectangular plate with two through holes. When the back plate is installed, the two through holes of the back plate are coaxial with the two step holes on the vertical plate of the base 1.

[0020] Furthermore, the balancing screw / nut 7 does not apply torque.

[0021] The utility model has the following advantages:

[0022] 1. The utility model realizes the simulation of the working condition in which the screw rod of the explosive bolt is subjected to three different stress states during the ignition test;

[0023] 2. The present invention realizes the real simulation of the stress condition of explosive bolts simply and economically by adding a loader and utilizing standard screw / nut parts on the basis of a conventional explosive bolt ignition test device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a front view of a three-stress loading ignition test device for explosive bolts according to the utility model;

[0025] Figure 2 This is a bottom view of a three-stress loading ignition test device for explosive bolts according to the present invention;

[0026] Figure 3 This is a top view of a three-stress loading ignition test device for explosive bolts according to the utility model;

[0027] Figure 4 This is a right view of a three-stress loading ignition test device for explosive bolts according to the utility model;

[0028] Figure 5 Schematic diagram of the base structure;

[0029] Figure 6 This is a schematic diagram of the loader structure;

[0030] Figure 7 Schematic diagram of the target plate structure. DETAILED DESCRIPTION

[0031] In order to better understand the purpose, structure and function of the present invention, the present invention is described in further detail below with reference to the accompanying drawings.

[0032] like Figures 1-4 As shown, the explosive bolt three-stress loading ignition test device of this embodiment includes a base 1, a loader 2, a pin 3, a target plate 4, a back plate 5, a shear force screw / nut 6, a balance screw / nut 7, and a back plate fastening screw / nut 8, and is characterized by:

[0033] The bottom plate of the base 1 is rectangular, and a rectangular vertical plate perpendicular to the bottom plate is provided on the top of the bottom plate. The long side of the vertical plate is parallel to the long side of the bottom plate but does not touch the long side of the bottom plate. The vertical plate is close to the long side of the rear side of the bottom plate. Three horizontal through holes are provided on the vertical plate, including a main through hole and two step holes. The two step holes have the same diameter and are symmetrical about the center of the main through hole. A triangular reinforcing plate is provided at each end of the vertical plate and the bottom plate. The reinforcing plate acts as a reinforcing rib. A through hole is provided on each reinforcing plate. The two through holes are coaxial. When installing the explosive bolt, the screw of the explosive bolt is passed through the main through hole from the rear of the vertical plate and pressed against the vertical plate through the explosive bolt flange.

[0034] The main structure of the loader 2 is L-shaped, with a through hole provided at the center of the bottom surface of the L-shape, a pin hole provided on the side surface of the L-shape, a reinforcing plate provided at the right end of the L-shape, and a through hole provided on the reinforcing plate. When installing the loader, the through hole of the L-shaped bottom surface of the loader is passed through the screw rod of the explosive bolt, and the bottom surface is pressed tightly against the vertical plate of the base 1. The side surface of the L-shape should be above the screw rod of the explosive bolt, and the pin hole on the side surface should be in the same longitudinal plane as the screw rod, but should not be blocked by the screw rod. The through hole on the reinforcing plate should be coaxial with the through hole on the reinforcing plate of the base 2;

[0035] The pin 3 is a copper flat-headed pin, and the pin is loosely matched with the pin hole of the loader 2. When the pin is installed in the pin hole of the loader 2, the pin length should be greater than the thickness of the loader, and the pin contacts the screw end face of the explosive bolt;

[0036] The target plate 4 includes a non-metallic block 401, two copper bars 402, and two cables 403. The two cables 403 are respectively welded to one end of the two copper bars 402. The two copper bars 402 are respectively vertically fixed on both sides of the non-metallic block 401, and the copper bars are higher than the top surface of the non-metallic block.

[0037] The back plate 5 is a rectangular plate with two through holes. When the back plate is installed, the two through holes of the back plate are coaxial with the two stepped holes on the vertical plate of the base 1.

[0038] The shear force screws / nuts 6 are a set of 12.9 grade high-strength standard screws / nuts. The screws are inserted through the through holes on the right reinforcing plate of the loader 2 and exit from the through holes on the right reinforcing plate of the base 1. They are tightened with nuts. The applied torque is calculated according to the bolt tightening torque formula.

[0039] The balancing screws / nuts 7 are a set of 12.9 grade high-strength standard screws / nuts. Insert the screws through the through holes on the left reinforcing plate of the loader 2 and exit from the through holes on the left reinforcing plate of the base 1. Tighten the mounting nuts by hand without applying torque.

[0040] The back plate fastening screws / nuts 8 are two sets of 12.9 grade high-strength standard screws / nuts. The screws are respectively inserted into the two stepped holes of the base 1 and respectively passed out from the two through holes of the back plate 5. The nuts are used to limit the position and are not tightened.

[0041] When using it specifically: insert the screw of the explosive bolt from the rear side of the vertical plate of the base 1, press the flange of the explosive bolt against the rear side of the vertical plate of the base 1, press the back plate 5 against the rear side of the explosive bolt, insert two pairs of back plate fastening screws 8 from the two stepped holes of the vertical plate of the base 1 respectively, pass them out from the two through holes of the back plate 5, and tighten them with nuts. Pass the through hole on the side of the loader 2 onto the screw of the explosive bolt, press the side of the loader 2 against the front side of the vertical plate of the base 1, and make the top surface of the L-shape above the screw of the explosive bolt, so that the through holes on the reinforcing plates at both ends of the loader 2 are coaxial with the through holes on the reinforcing plates at both ends of the base 1. Insert the shear force screw 6 from the through hole on the reinforcing plate on the right side of the loader 2, pass it out from the through hole on the reinforcing plate on the right side of the base 1, tighten it with a nut, and calculate the applied torque according to formula ①:

[0042] T=k×D×F…………………………………………①

[0043] T——torque, unit N·m;

[0044] k——coefficient, generally 0.15~0.25;

[0045] D——nominal diameter of the screw, in m;

[0046] F——the shear force borne by the screw of the explosive bolt, in N;

[0047] Among them, F should be the same as the shear force that the explosive bolt withstands during actual use.

[0048] Insert the balance screw 7 through the through hole on the left reinforcing plate of the loader 2, and pass it out from the through hole of the left reinforcing plate of the base 1. Tighten the installation nut by hand without applying torque. Screw on the nut of the explosive bolt screw, and the torque applied should be the same as the actual torque used. Insert the pin 3 from the pin hole of the loader 2 and fit it tightly against the front end face of the explosive bolt screw. Stick the target plate 4 at a certain distance from the front end of the explosive bolt screw. When the screw flies out after the explosive bolt ignites, the screw should be able to touch the two copper bars 402 in succession, and connect the two cables 403 to the electrical signal detector respectively.

[0049] During the ignition test, the explosive bolt installed on the three-stress loading ignition test device is ignited and works. Under the action of the axial preload, the resistance applied by the pin and the radial shear force borne by the screw, the screw flies out and touches the two copper bars 402 in succession. The electrical signal detector detects two electrical signals in succession, thereby completing the ignition test and obtaining the ignition performance data.

[0050] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make several modifications and improvements without departing from the principles of the present invention, and these modifications and improvements should also be considered to fall within the scope of protection of the present invention.

Claims

1. A three-stress loading ignition test device for explosive bolts, characterized in that: It includes a base (1), a loader (2), a pin (3), a target plate (4), a back plate (5), a shear force screw / nut (6), a balance screw / nut (7), and a back plate fastening screw / nut (8); The base (1) is a T-shaped structure, and a through hole is provided on the vertical plate thereof, and the screw of the explosive bolt is inserted into the through hole of the vertical plate from the rear side of the vertical plate of the base (1); the back plate (5) is arranged in parallel with the vertical plate of the base (1), and is pressed against the rear end surface of the explosive bolt, and the back plate (5) and the vertical plate of the base (1) are fixed by back plate fastening screws / nuts (8); The loader (2) is a box-type structure with an opening, and a through hole is provided on the rear side plate thereof for inserting the screw of the explosive bolt; the rear side plate of the loader (2) is in contact with the front side of the vertical plate of the base (1); The two side plates of the loader (2) are provided with corresponding through holes, and the shear force screws / nuts (6) and the balancing screws / nuts (7) respectively connect the two side plates of the loader (2) to the reinforcement plates at corresponding positions of the base (1); A pin hole is provided on the top plate of the loader (2), the pin (3) is inserted into the pin hole, and the side wall of the pin (3) is fitted with the end of the screw of the explosive bolt; The target plate (4) is arranged at the front end of the base (1), and a distance is left between the target plate (4) and the end of the explosive bolt screw.

2. The explosive bolt triple stress loading ignition test device according to claim 1, characterized in that: The bottom plate of the base (1) is rectangular, and a rectangular vertical plate perpendicular to the bottom plate is provided on the top of the bottom plate.

3. The explosive bolt triple stress loading ignition test device according to claim 1, characterized in that: Three horizontal through holes are provided on the vertical plate, including a main through hole and two step holes. The two step holes have the same diameter and are symmetrical about the center of the main through hole.

4. The explosive bolt triple stress loading ignition test device according to claim 3, characterized in that: A triangular reinforcing plate is provided at each end of the vertical plate and the bottom plate of the base (1), and the reinforcing plate serves as a reinforcing rib. A through hole is provided on each reinforcing plate, and the two through holes are coaxial.

5. The explosive bolt triple stress loading ignition test device according to claim 1, characterized in that: The pin (3) is a copper flat-head nail.

6. The explosive bolt triple stress loading ignition test device according to claim 5, characterized in that: The pin is clearance-matched with the pin hole of the loader (2).

7. The explosive bolt triple stress loading ignition test device according to claim 1, characterized in that: The target plate (4) comprises a non-metallic block (401), two copper bars (402), and two cables (403). The two cables (403) are respectively welded to one end of the two copper bars (402). The two copper bars (402) are respectively vertically fixed on both sides of the non-metallic block (401), and the copper bars are higher than the top surface of the non-metallic block.

8. The explosive bolt triple stress loading ignition test device according to claim 7, characterized in that: The two cables (403) are respectively connected to the electrical signal detector.

9. The explosive bolt triple stress loading ignition test device according to claim 3, characterized in that: The back plate (5) is a rectangular plate with two through holes. When the back plate is installed, the two through holes of the back plate are coaxial with the two step holes on the vertical plate of the base (1).

10. The explosive bolt triple stress loading ignition test device according to claim 1, characterized in that: The balancing screw / nut (7) does not apply torque.

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