Height measuring scale suitable for narrow gap and measuring method

Abstract

The invention relates to the technical field of dismounting of initiating explosive devices, in particular to a height measuring scale suitable for a narrow gap and a measuring method.The height measuring scale comprises a bottom plate and a sliding piece, the sliding piece is slidably connected with the bottom plate, the bottom plate is provided with scales and a positioning piece, and the positioning piece is used for fixing the sliding piece; a narrow body and an inserting piece are arranged at the lower end of the bottom plate and the lower end of the sliding piece respectively, the end of the narrow body is flush with the end of the inserting piece, the narrow body is used for abutting against the upper end face of a step of an upper shell of the firer electromechanical device, and the inserting piece is used for abutting against the upper end face of a lower shell of the firer electromechanical device under driving of the sliding piece. The height difference between the upper end face of the step of the upper shell of the firer electromechanical device and the upper end face of the lower shell of the firer electromechanical device can be calculated according to the scale corresponding to the upper end of the sliding piece when the narrow body is flush with the end of the insertion piece and the scale corresponding to the upper end of the sliding piece when the insertion piece abuts against the upper end face of the lower shell of the firer electromechanical device. Whether the firer electromechanical device can be integrally taken out or not can be judged, and the safety of the dismounting process is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of disassembly of explosive devices, and in particular to a height measuring ruler and a measuring method suitable for narrow gaps. Background Art

[0002] When aerospace equipment reaches the end of its service life, it needs to be extended. The pyrotechnics and electromechanical devices installed need to be removed and replaced. The pyrotechnics and electromechanical devices must be removed as a whole, otherwise it will bring safety risks.

[0003] Usually, the shell of a pyrotechnic electromechanical device is divided into an upper shell and a lower shell, and the device can be taken out through the process hole during disassembly. The process hole of some pyrotechnic electromechanical devices is opened in the upper shell, and the pyrotechnic electromechanical device can only be taken out by twisting the upper shell. The upper shell and the lower shell are connected by threads and thread lockers. After long-term storage, the thread lockers age and may be detached from the lower shell when only twisting the upper shell, making it difficult to ensure that the pyrotechnic electromechanical device is taken out as a whole. According to the structure of the pyrotechnic electromechanical device, the height difference between the upper shell and the lower shell can be detected during the removal process to determine whether the two are detached.

[0004] Since the gap between the inner wall of the aerospace equipment shell and the pyrotechnic electromechanical device installed therein is narrow, conventional height gauges cannot be inserted into the gap to measure the height difference, and feeler gauges can only be inserted into the gap but cannot measure the height. Therefore, a height gauge is needed that can not only be inserted into the narrow gap inside the aerospace equipment, but also can measure the height difference between the upper shell and the lower shell of the pyrotechnic electromechanical device, so as to detect whether the upper shell is detached from the lower shell when the upper shell is loosened, and ensure the safety of the disassembly process. Summary of the invention

[0005] The purpose of the present invention is to address the defects of the prior art and provide a height measuring ruler and measuring method suitable for narrow gaps. The ruler and measuring method can detect whether the upper shell and the lower shell are detached during the process of unscrewing the pyrotechnic electromechanical device, determine whether the pyrotechnic electromechanical device can be taken out as a whole, and ensure the safety of the disassembly process.

[0006] In order to solve the above technical problems, in a first aspect, the present invention provides a height measuring ruler suitable for narrow gaps, comprising a base plate and a sliding piece, the sliding piece is slidably connected to the base plate, a scale and a positioning piece are arranged on the base plate, the positioning piece is used to fix the sliding piece, a narrow body and an insert are respectively arranged at the lower ends of the base plate and the sliding piece, the ends of the narrow body and the insert are flush, the narrow body is used to abut against the upper end face of the step of the upper shell of the pyrotechnic electromechanical device, and the insert is used to abut against the upper end face of the lower shell of the pyrotechnic electromechanical device under the drive of the sliding piece, according to the scale corresponding to the upper end of the sliding piece when the ends of the narrow body and the insert are flush and the scale corresponding to the upper end of the sliding piece when the insert abuts against the upper end face of the lower shell of the pyrotechnic electromechanical device, the height difference between the upper end face of the step of the upper shell of the pyrotechnic electromechanical device and the upper end face of the lower shell of the pyrotechnic electromechanical device can be calculated.

[0007] In some embodiments, the narrow body and the insert are of equal length, the bottom plate and the sliding plate are of equal length, and the zero scale point of the scale is at the upper end of the bottom plate.

[0008] In some embodiments, a through groove is provided on the bottom plate along the length direction, and the sliding sheet is slidably arranged in the through groove.

[0009] In some embodiments, the scale is arranged on the bottom plate surface close to the positions on both sides of the through groove.

[0010] In some embodiments, the positioning member includes a positioning ring and a clamping member, the positioning ring is fixedly sleeved on the bottom plate, the clamping member is threadedly connected to the positioning ring, and one end of the clamping member passes through the positioning ring and presses against the sliding sheet, thereby fixing the sliding sheet.

[0011] In some embodiments, a push pin is disposed on the sliding sheet, and the push pin is perpendicular to the sliding sheet.

[0012] In some embodiments, the push pin is threadably connected to the sliding piece.

[0013] In some embodiments, the thickness of the narrow body is t1, the distance between the narrow body and the insert is d, and the width of the step of the upper shell of the pyrotechnic electromechanical device is b, where b=t1+d.

[0014] In a second aspect, the present invention provides a measurement method for a height measuring ruler suitable for a narrow gap, comprising:

[0015] Determine the step height h of the upper housing of the pyrotechnic electromechanical device;

[0016] Twist the upper housing of the pyrotechnic electromechanical device n turns;

[0017] Using the height measuring ruler suitable for narrow gaps, measure the height difference h1 between the upper end surface of the step of the upper shell of the pyrotechnic electromechanical device and the upper end surface of the lower shell of the pyrotechnic electromechanical device;

[0018] If h1>h, it means that the upper shell and the lower shell of the pyromechanical device are loose. Turn the upper shell of the pyromechanical device in the opposite direction and do not disassemble the pyromechanical device anymore; otherwise, continue to turn the upper shell of the pyromechanical device to complete the disassembly of the pyromechanical device.

[0019] Further, the method of using the height measuring ruler suitable for narrow gaps to measure the height difference h1 between the upper end surface of the step of the upper shell of the pyrotechnic electromechanical device and the upper end surface of the lower shell of the pyrotechnic electromechanical device includes:

[0020] Cancel the fixing of the sliding piece by the positioning piece, place the end of the narrow body at the lower end of the base plate against the upper end surface of the step of the upper shell of the pyrotechnic electromechanical device, slide the sliding piece so that the end of the insert at the lower end of the sliding piece is against the upper end surface of the lower shell of the pyrotechnic electromechanical device, directly read the reading at the upper end of the sliding piece, or fix the sliding piece with the positioning piece and then read the reading at the upper end of the sliding piece, calculate the height difference between the upper end surface of the step of the upper shell of the pyrotechnic electromechanical device and the upper end surface of the lower shell of the pyrotechnic electromechanical device.

[0021] The beneficial effects of the present invention are:

[0022] 1. The present invention arranges a narrow body and an insert at one end of a bottom plate and a sliding plate respectively; the narrow body can be inserted into a gap between an outer shell of aerospace equipment and an upper shell of a pyrotechnic electromechanical device, and abuts against an upper end face of a step of the upper shell of the pyrotechnic electromechanical device; the insert can be inserted into a gap between an outer shell of aerospace equipment and a step of the upper shell of the pyrotechnic electromechanical device, and abuts against an upper end face of a lower shell of the pyrotechnic electromechanical device; the height difference between an upper end face of the step of the upper shell of the pyrotechnic electromechanical device and an upper end face of the lower shell of the pyrotechnic electromechanical device can be calculated according to the scale corresponding to the sliding plate, thereby realizing height measurement in a narrow gap.

[0023] 2. The narrow body and the insert of the present invention are of equal length, the base plate and the sliding plate are of equal length, the zero scale point of the scale is at the upper end of the base plate, and the scale corresponding to the upper end face of the sliding plate is equal to the height difference between the upper end face of the step of the upper shell of the pyrotechnic electromechanical device and the upper end face of the lower shell of the pyrotechnic electromechanical device, so the measurement is convenient and quick.

[0024] 3. The sliding piece of the present invention is slidably arranged in the through groove of the bottom plate, so that the sliding piece moves completely parallel to the length direction of the bottom plate, thereby ensuring the measurement accuracy.

[0025] 4. The thickness of the narrow body of the present invention plus the distance between the narrow body and the insert is equal to the width of the step of the upper shell of the pyrotechnic electromechanical device, so that when the narrow body is attached to the upper shell of the pyrotechnic electromechanical device and rests against the upper end surface of the step of the upper shell of the pyrotechnic electromechanical device, the insert can be directly inserted into the gap between the outer shell of the aerospace equipment and the step of the upper shell of the pyrotechnic electromechanical device, without the need to align the insert with the gap between the outer shell of the aerospace equipment and the step of the upper shell of the pyrotechnic electromechanical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is an axonometric diagram of the height measuring ruler of the present invention suitable for use in narrow gaps;

[0027] Figure 2 It is a left view of the height measuring ruler suitable for narrow gaps in the present invention;

[0028] Figure 3 It is an assembly diagram of the pyrotechnic electromechanical device and aerospace equipment of the present invention;

[0029] Figure 4This is a schematic diagram of the use of the height measuring ruler of the present invention suitable for narrow gaps;

[0030] Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0031] Reference numerals:

[0032] Base plate 1; sliding piece 2; push pin 3; positioning ring 4; clamping screw 5; fastening screw 6; narrow body 7; insert 8;

[0033] Aerospace equipment housing 101;

[0034] The pyrotechnic electromechanical device upper housing 201; the pyrotechnic electromechanical device lower housing 202; and the step 203. DETAILED DESCRIPTION

[0035] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0036] like Figure 3 As shown, the pyromechanical device includes an upper shell 201 of the pyromechanical device and a lower shell 202 of the pyromechanical device. The outer wall of the upper shell 201 of the pyromechanical device and the inner wall of the lower shell 202 of the pyromechanical device are threadedly connected and coated with thread locking glue. The outer wall of the lower shell 202 of the pyromechanical device is threadedly connected to the aerospace equipment shell 101. When the pyromechanical device needs to be taken out from the aerospace equipment shell 101, it needs to be done by twisting the upper shell 201 of the pyromechanical device, but twisting the upper shell 201 of the pyromechanical device may cause the upper shell 201 of the pyromechanical device and the lower shell 202 of the pyromechanical device to be disengaged. However, there is a first gap between the outer wall of the upper shell 201 of the pyrotechnic electromechanical device and the outer shell 101 of the aerospace equipment. A step 203 is arranged on the outer wall of the upper shell 201 of the pyrotechnic electromechanical device. The outer diameter of the step 203 is slightly smaller than the outer diameter of the lower shell 202 of the pyrotechnic electromechanical device, so that a second gap within the first gap is formed between the step 203 and the outer shell 101 of the aerospace equipment. The second gap is smaller than the first gap. Only by measuring the depth of the second gap can it be known whether the upper shell 201 of the pyrotechnic electromechanical device and the lower shell 202 of the pyrotechnic electromechanical device are detached.

[0037] like Figure 1 , 2As shown, the present invention provides a height measuring ruler suitable for narrow gaps, comprising a base plate 1 and a sliding piece 2, the length directions of the base plate 1 and the sliding piece 2 are parallel, the sliding piece 2 is slidably connected to the base plate 1, a scale and a positioning member are arranged on the base plate 1, the positioning member is used to fix the sliding piece 2, that is, the sliding piece 2 can slide on the base plate 1 along the length direction of the base plate 1, and the sliding piece 2 can also be fixed by the positioning member, the lower ends of the base plate 1 and the sliding piece 2 are respectively provided with a narrow body 7 and an inserting piece 8, the ends of the narrow body 7 and the inserting piece 8 are flush, and the narrow body 7 is used to The insert 8 is used to press against the upper end face of the step 203 of the upper shell 201 of the pyrotechnic electromechanical device under the drive of the sliding piece 2 to press against the upper end face of the lower shell 202 of the pyrotechnic electromechanical device. According to the scale corresponding to the upper end of the sliding piece 2 when the ends of the narrow body 7 and the insert 8 are flush and the scale corresponding to the upper end of the sliding piece 2 when the insert 8 presses against the upper end face of the lower shell 202 of the pyrotechnic electromechanical device, the height difference between the upper end face of the step 203 of the upper shell 201 of the pyrotechnic electromechanical device and the upper end face of the lower shell 202 of the pyrotechnic electromechanical device can be calculated.

[0038] It can be understood that by providing the narrow body 7, when the narrow body 7 is against the upper end face of the step 203 of the upper shell 201 of the pyromechanical device (that is, when the narrow body 7 is fully inserted into the first gap), the entire base is fixed. At this time, the sliding piece 2 is moved to insert the plug 8 into the second gap and against the upper end face of the lower shell 202 of the pyromechanical device. Since the ends of the narrow body 7 and the plug 8 are flush in the initial state, the difference between the corresponding scales before the movement of the sliding piece 2 and the corresponding scales after the movement is the insertion depth of the plug 8, and the depth is the height difference between the upper end face of the step 203 of the upper shell 201 of the pyromechanical device and the upper end face of the lower shell 202 of the pyromechanical device. If there is a disengagement phenomenon between the upper shell 201 of the pyromechanical device and the lower shell 202 of the pyromechanical device, the depth must be greater than the height of the step 203, so that it can be judged whether the upper shell 201 of the pyromechanical device and the lower shell 202 of the pyromechanical device are disengaged.

[0039] In some embodiments, the narrow body 7 and the inserting piece 8 are of equal length, the bottom plate 1 and the sliding piece 2 are of equal length, and the zero scale point of the scale is at the upper end of the bottom plate 1 .

[0040] It can be understood that when the ends of the narrow body 7 and the insert 8 are flush in the initial state, the upper ends of the base plate 1 and the sliding plate 2 are also flush, and after the insert 8 rests against the upper end surface of the lower shell 202 of the pyrotechnic electromechanical device, the scale corresponding to the upper end of the sliding plate 2 is the insertion depth of the insert 8.

[0041] In some embodiments, a through groove is formed on the bottom plate 1 along the length direction, and the sliding sheet 2 is slidably arranged in the through groove. The upper and lower ends of the through groove both penetrate the bottom plate 1.

[0042] In some embodiments, the scales are arranged on the surface of the base plate 1 close to the positions on both sides of the through groove.

[0043] In some embodiments, the positioning member includes a positioning ring 4 and a clamping member. The positioning ring 4 is fixedly sleeved on the bottom plate 1. The clamping member is threadedly connected to the positioning ring 4. One end of the clamping member passes through the positioning ring 4 and presses against the sliding sheet 2, thereby fixing the sliding sheet 2. The clamping member can be a clamping screw 5. The positioning ring 4 can be directly welded to the bottom plate 1 or threadedly connected to the bottom plate 1 through a fastening screw 6. Multiple positioning members can be provided as needed. Figure 1 Schematic diagram of the case where two positioning members are provided, and the two positioning members are arranged close to the two ends of the base plate 1 respectively.

[0044] In some embodiments, the insert 8 and the sliding sheet 2 are an integral structure. After the positioning piece cancels the fixation of the sliding sheet 2, the sliding sheet 2 can be directly pulled out from the base plate 1, so that inserts 8 of different thicknesses can be replaced to adapt to different pyrotechnic electromechanical devices. The thickness of the insert 8 can be selected within the range of 0.3 mm to 2 mm.

[0045] In some embodiments, a push pin 3 is disposed on the sliding sheet 2 , and the push pin 3 is perpendicular to the sliding sheet 2 .

[0046] In some embodiments, the push pin 3 is threadedly connected to the sliding sheet 2. The push pin 3 can be a bolt.

[0047] In some embodiments, the thickness of the narrow body 7 is t1, the distance between the narrow body 7 and the insert 8 is d, and the width of the step 203 of the upper shell 201 of the pyrotechnic electromechanical device is b, where b=t1+d.

[0048] It is understandable that if Figure 5 As shown, when the narrow body 7 is attached to the upper shell 201 of the pyrotechnic electromechanical device and rests against the upper end surface of the step 203 of the upper shell 201 of the pyrotechnic electromechanical device, the insert 8 will not be affected by the step 203, and the insert 8 can be directly inserted into the second gap between the aerospace equipment shell 101 and the step 203 of the upper shell 201 of the pyrotechnic electromechanical device, without the need to align the insert 8 with the gap between the aerospace equipment shell 101 and the step 203 of the upper shell 201 of the pyrotechnic electromechanical device.

[0049] In a second aspect, the present invention provides a measurement method for a height measuring ruler suitable for a narrow gap, comprising:

[0050] Determine the height h of the step 203 of the upper housing 201 of the pyrotechnic electromechanical device. In some embodiments, h=1.5 mm;

[0051] Twist the upper shell 201 of the pyrotechnic electromechanical device n turns; in some embodiments, the safety locking amount of the pyrotechnic electromechanical device is greater than the length of three turns of the shell thread, and the connecting thread between the upper shell and the lower shell is much greater than three turns, so the state of rotating the upper shell three turns counterclockwise is used as the stop control point for the safety state monitoring, that is, n=3;

[0052] like Figure 4 , 5 As shown, a height measuring ruler suitable for narrow gaps is used to measure the height difference h1 between the upper end surface of the step 203 of the upper shell 201 of the pyrotechnic electromechanical device and the upper end surface of the lower shell 202 of the pyrotechnic electromechanical device;

[0053] If h1>h, it means that the upper shell 201 and the lower shell 202 of the pyromechanical device are loose. Turn the upper shell 201 of the pyromechanical device in the opposite direction and do not disassemble the pyromechanical device anymore; otherwise, continue to turn the upper shell 201 of the pyromechanical device to complete the disassembly of the pyromechanical device.

[0054] Further, the method includes: using a height measuring ruler suitable for a narrow gap to measure the height difference h1 between the upper end surface of the step 203 of the upper shell 201 of the pyrotechnic electromechanical device and the upper end surface of the lower shell 202 of the pyrotechnic electromechanical device includes:

[0055] like Figure 5 As shown, the fixing of the sliding piece 2 by the positioning piece is cancelled, and the end of the narrow body 7 at the lower end of the base plate 1 is pressed against the upper end surface of the step 203 of the upper shell 201 of the pyrotechnic electromechanical device. The sliding piece 2 is slid so that the end of the insert piece 8 at the lower end of the sliding piece 2 is pressed against the upper end surface of the lower shell 202 of the pyrotechnic electromechanical device. The reading at the upper end of the sliding piece 2 is directly read, or the sliding piece 2 is fixed with the positioning piece and then the reading at the upper end of the sliding piece 2 is read, and the height difference between the upper end surface of the step 203 of the upper shell 201 of the pyrotechnic electromechanical device and the upper end surface of the lower shell 202 of the pyrotechnic electromechanical device is calculated.

[0056] The invention has a simple structure and is easy to assemble. It can effectively detect whether the upper shell and the lower shell are detached when the pyrotechnic electromechanical device is disassembled, thereby ensuring the safety of the disassembly process and having good practical value.

[0057] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A height measuring ruler suitable for narrow gaps, characterized in that: The invention comprises a bottom plate (1) and a sliding sheet (2), wherein the sliding sheet (2) is slidably connected to the bottom plate (1), a scale and a positioning member are arranged on the bottom plate (1), and the positioning member is used to fix the sliding sheet (2), and a narrow body (7) and an inserting sheet (8) are arranged at the lower ends of the bottom plate (1) and the sliding sheet (2), respectively, and the ends of the narrow body (7) and the inserting sheet (8) are flush, and the narrow body (7) is used to abut against the upper end surface of a step (203) of an upper shell (201) of an pyrotechnic electromechanical device, and the inserting sheet (8 ... ) is used to abut against the upper end face of the lower shell (202) of the pyrotechnic electromechanical device under the drive of the sliding sheet (2). According to the scale corresponding to the upper end of the sliding sheet (2) when the ends of the narrow body (7) and the insert sheet (8) are flush and the scale corresponding to the upper end of the sliding sheet (2) when the insert sheet (8) abuts against the upper end face of the lower shell (202) of the pyrotechnic electromechanical device, the height difference between the upper end face of the step (203) of the upper shell (201) of the pyrotechnic electromechanical device and the upper end face of the lower shell (202) of the pyrotechnic electromechanical device can be calculated.

2. The height measuring ruler suitable for narrow gaps according to claim 1, characterized in that: The narrow body (7) and the insert (8) are of equal length, the bottom plate (1) and the sliding plate (2) are of equal length, and the zero scale point of the scale is at the upper end of the bottom plate (1).

3. The height measuring ruler suitable for narrow gaps according to claim 1 or 2, characterized in that: The bottom plate (1) is provided with a through groove along the length direction, and the sliding sheet (2) is slidably arranged in the through groove.

4. The height measuring ruler suitable for narrow gaps according to claim 3, characterized in that: The scales are arranged on the surface of the bottom plate (1) close to the positions on both sides of the through groove.

5. The height measuring ruler suitable for narrow gaps according to claim 1 or 2, characterized in that: The positioning member comprises a positioning ring (4) and a pressing member. The positioning ring (4) is fixedly sleeved on the base plate (1). The pressing member is threadedly connected to the positioning ring (4). One end of the pressing member passes through the positioning ring (4) and is pressed against the sliding sheet (2), thereby fixing the sliding sheet (2).

6. The height measuring ruler suitable for narrow gaps according to claim 1 or 2, characterized in that: A push pin (3) is arranged on the sliding sheet (2), and the push pin (3) is perpendicular to the sliding sheet (2).

7. The height measuring ruler suitable for narrow gaps according to claim 6, characterized in that: The push pin (3) is threadedly connected to the sliding sheet (2).

8. The height measuring ruler suitable for narrow gaps according to claim 1 or 2, characterized in that: The thickness of the narrow body (7) is t1, the distance between the narrow body (7) and the insert (8) is d, and the width of the step (203) of the upper shell (201) of the pyrotechnic electromechanical device is b, where b=t1+d.

9. A method for measuring a height measuring ruler suitable for a narrow gap according to any one of claims 1 to 8, characterized in that: include: Determining a height h of a step (203) of an upper housing (201) of an pyrotechnic electromechanical device; Twist the upper housing (201) of the pyrotechnic electromechanical device n turns; Using the height measuring ruler suitable for narrow gaps, measuring the height difference h1 between the upper end surface of the step (203) of the upper shell (201) of the pyrotechnic electromechanical device and the upper end surface of the lower shell (202) of the pyrotechnic electromechanical device; If h1>h, it means that the upper shell (201) and the lower shell (202) of the pyromechanical device are loose, and the upper shell (201) of the pyromechanical device is turned in the opposite direction to stop disassembling the pyromechanical device; otherwise, the upper shell (201) of the pyromechanical device is continued to be turned to complete the disassembly of the pyromechanical device.

10. The measuring method according to claim 9, characterized in that: A method for measuring the height difference h1 between the upper end surface of the step (203) of the upper shell (201) of the pyrotechnic electromechanical device and the upper end surface of the lower shell (202) of the pyrotechnic electromechanical device using the height measuring ruler suitable for a narrow gap comprises: The fixing of the sliding sheet (2) by the positioning piece is cancelled, the end of the narrow body (7) at the lower end of the bottom plate (1) is pressed against the upper end surface of the step (203) of the upper shell (201) of the pyrotechnic electromechanical device, the sliding sheet (2) is slid so that the end of the inserting piece (8) at the lower end of the sliding sheet (2) is pressed against the upper end surface of the lower shell (202) of the pyrotechnic electromechanical device, the reading of the upper end of the sliding sheet (2) is directly read, or the reading of the upper end of the sliding sheet (2) is read after the sliding sheet (2) is fixed by the positioning piece, and the height difference between the upper end surface of the step (203) of the upper shell (201) of the pyrotechnic electromechanical device and the upper end surface of the lower shell (202) of the pyrotechnic electromechanical device is calculated.

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