A friction energy dissipation protection device for large-tonnage explosive bolts to reduce separation impact

Abstract

The present invention discloses a friction energy-dissipating protective device for large-tonnage explosive bolts for reducing separation impact, comprising: a bolt end cap, an outer shell and a threaded energy-absorbing inner shell; the bolt end cap is connected to one end of the explosive bolt; the threaded energy-absorbing inner shell is located in the outer shell to form a combination; the combination is connected to an explosive bolt box on a rocket shell; the other end of the explosive bolt is screwed into the explosive bolt box. The present invention utilizes the relative friction movement between the bolt end cap and the inner thread of the energy-absorbing tube to shear the inner wall thread of the energy-absorbing tube and consume kinetic energy, thereby reducing the impact force of the rocket body.

Description

Technical Field

[0001] The invention belongs to the technical field of aerospace structure design, and in particular relates to a friction energy dissipation type protective device for large-tonnage explosive bolts that reduces separation impact. Background Art

[0002] As the largest diameter solid commercial launch vehicle in China, in order to adapt to the launch needs of satellites of various sizes and different load requirements, a solid launch fairing design technology that can resist pulsating pressure under large cone angles is applied. Due to the large diameter of the fairing and the influence of pulsating pressure under large cone angles, the separation of the fairing faces higher thrust requirements. The commonly used tonnage explosive bolts cannot meet the separation requirements of the fairing. Therefore, large-tonnage explosive bolts are required to achieve normal separation of the fairing. Large-tonnage explosive bolts will generate a large impact force when working, and the screw will fly out at high speed. In order to prevent accidental damage caused by the impact of the screw, a screw capture buffer device needs to be set. Although the traditional capture buffer device has a certain buffering function, the impact reduction effect does not meet the model requirements. Summary of the invention

[0003] The technology of the present invention solves the problem: it overcomes the shortcomings of the prior art and provides a friction energy-absorbing protection device for large-tonnage explosive bolts that reduces separation impact. The device utilizes relative friction movement between the bolt end cap and the inner thread of the energy-absorbing tube to shear the inner wall thread of the energy-absorbing tube and consume kinetic energy, thereby reducing the impact force of the rocket body.

[0004] In order to solve the above technical problems, the present invention discloses a friction energy dissipation protection device for large-tonnage explosive bolts for reducing separation impact, comprising: a bolt end cap, an outer shell and a threaded energy-absorbing inner shell;

[0005] The bolt end cap is connected to one end of the explosive bolt;

[0006] The threaded energy-absorbing inner shell is located inside the outer shell to form a combined body; the combined body is connected to the explosive bolt box on the rocket shell;

[0007] The other end of the explosive bolt is screwed into the explosive bolt box.

[0008] In the above-mentioned large-tonnage explosive bolt friction energy dissipation protection device for reducing separation impact, the explosive bolt is a 30-ton explosive bolt.

[0009] In the above-mentioned large-tonnage explosive bolt friction energy dissipation protection device for reducing separation impact, the bolt end cap includes: a column section A and a cone section;

[0010] The height of column section A is 9 mm, and the outer diameter of column section A is Φ38.3 mm; an M24×1.5 thread is provided on the inner wall of column section A, the thread length is 25 mm, and a 3 mm thread backing groove is provided at the bottom of the thread;

[0011] The end of the cone section away from the column section A is a hexagonal structure; wherein the height of the hexagonal structure is 13 mm, and the distance between opposite sides of the hexagonal structure is 17 mm; the cone section is connected to the explosive bolt through the hexagonal structure;

[0012] The total height of the bolt end cap is 38mm; the bolt end cap material is 7050 aluminum alloy.

[0013] In the above-mentioned large-tonnage explosive bolt friction energy dissipation protection device for reducing separation impact, the outer shell includes: a column section B, two side ears, two bolt holes A and two bolt holes B;

[0014] Two side ears are respectively located on both sides of column section B; two bolt holes A are respectively arranged on the two side ears; two bolt holes B are respectively arranged on the two side ears;

[0015] The outer diameter of column section B is Φ56mm and the height is 73mm; the inner diameter of column section B is Φ46mm and the height is 67mm;

[0016] The end face distance between the two side ears is 75mm; the distance between the upper end faces of the two side ears protruding from the column segment B is between 10 and 12mm;

[0017] The diameter of bolt hole A is larger than the diameter of bolt hole B;

[0018] The distance between bolt hole A and the upper end face of column segment B is 13 mm, and the distance between bolt hole B and the upper end face of column segment B is 31 mm;

[0019] The outer shell material is 7050 aluminum alloy.

[0020] In the above-mentioned large-tonnage explosive bolt friction energy dissipation protection device for reducing separation impact, the bolt hole A is an M12×1.5 threaded hole, and the bolt hole B is an M4 threaded hole.

[0021] In the above-mentioned large-tonnage explosive bolt friction energy dissipation protection device for reducing separation impact, the threaded energy absorbing inner shell is a cylindrical structure, the outer diameter of the threaded energy absorbing inner shell is Φ46mm, the inner diameter is M40×3 thread, the height is 47.5mm, and the material of the threaded energy absorbing inner shell is 7050 aluminum alloy.

[0022] In the above-mentioned large-tonnage explosive bolt friction energy-absorbing protection device for reducing separation impact, when the explosive bolt is working, an impact force is generated, and the broken explosive bolt moves downward with the bolt end cap, and the bolt end cap falls into the threaded energy-absorbing inner shell, and friction movement occurs with the internal threads of the threaded energy-absorbing inner shell. Friction shear destroys the internal threads of the threaded energy-absorbing inner shell and consumes kinetic energy, thereby realizing a buffering function and reducing the impact on the rocket shell.

[0023] In the above-mentioned large-tonnage explosive bolt friction energy dissipation protection device for reducing separation impact, one end of the explosive bolt is screwed into the bolt end cap and coated with glue to prevent loosening.

[0024] In the above-mentioned large-tonnage explosive bolt friction energy dissipation protection device for reducing separation impact, during assembly, there are:

[0025] Place the assembly on the explosive bolt box of the rocket shell. During assembly, ensure that the center hole of the assembly is coaxial with the explosive bolt mounting hole on the explosive bolt box, and that the bolt hole A and the two bolt holes B are aligned with the corresponding connection holes on the explosive bolt box.

[0026] Two connecting bolts A and two connecting bolts B pass through the two bolt holes A and the two bolt holes B respectively to connect the assembly to the explosive bolt box;

[0027] Connect the explosive bolt to the bolt end cap;

[0028] The explosive bolt connected with the bolt end cap is passed through the center hole of the assembly and screwed into the explosive bolt installation hole on the explosive bolt box to complete the assembly.

[0029] In the above-mentioned large-tonnage explosive bolt friction energy dissipation protection device for reducing separation impact, the connecting bolt A plays a shearing role, and the connecting bolt B plays a limiting role.

[0030] The present invention has the following advantages:

[0031] (1) The present invention discloses a friction energy dissipation protection device for large-tonnage explosive bolts for reducing separation impact. Through the design concept of friction energy dissipation between structural parts, the tail end of the bolt end cap is inside the threaded energy absorption inner shell, and the capture effect is stable and reliable. The friction thread buffer energy dissipation method is used to reduce the impact on the rocket body during the separation of the fairing, effectively reducing the impact force generated by the large-tonnage explosive bolts when the fairing of the solid carrier rocket is separated, and solving the problem of capturing and reducing the impact of large-tonnage explosive bolts on the carrier rocket.

[0032] (2) The present invention discloses a friction energy dissipation protection device for large-tonnage explosive bolts for reducing separation impact. Compared with the existing launch vehicle fairing separation buffer structure, the present invention adopts a combined structure of bolt end cap + threaded energy absorption inner shell + outer shell, which has the advantages of small structural size and light weight.

[0033] (3) The present invention discloses a friction energy dissipation protection device for large-tonnage explosive bolts that reduces separation impact. The threaded energy-absorbing inner shell is installed in the outer shell, which can be quickly disassembled and installed.

[0034] (4) The present invention discloses a friction energy dissipation protection device for large-tonnage explosive bolts that reduces separation impact. The device has undergone ground tests, fairing separation tests, and flight tests, and the test results meet various index requirements for rocket flight. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the composition of a friction energy dissipation protection device for large-tonnage explosive bolts for reducing separation impact in an embodiment of the present invention;

[0036] Figure 2 It is a cross-sectional view of the components of a friction energy dissipation protection device for large-tonnage explosive bolts for reducing separation impact in an embodiment of the present invention;

[0037] Figure 3 is a schematic structural diagram of an outer shell in an embodiment of the present invention;

[0038] Figure 4 is a structural cross-sectional view of an outer shell in an embodiment of the present invention;

[0039] Figure 5 is a schematic structural diagram of a bolt end cap in an embodiment of the present invention;

[0040] Figure 6 is a structural cross-sectional view of a bolt end cap in an embodiment of the present invention;

[0041] Figure 7 It is a schematic structural diagram of a threaded energy-absorbing inner shell in an embodiment of the present invention;

[0042] Figure 8 It is a structural cross-sectional view of a threaded energy-absorbing inner shell in an embodiment of the present invention. DETAILED DESCRIPTION

[0043] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments disclosed in the present invention will be further described in detail below with reference to the accompanying drawings.

[0044] One of the core ideas of the present invention is to utilize the relative friction movement between the bolt end cap and the inner thread of the threaded energy absorbing inner shell to shear the inner wall thread of the energy absorbing tube and consume kinetic energy, thereby reducing the impact force of the rocket body.

[0045] like Figure 1 and Figure 2 The large-tonnage explosive bolt friction energy dissipation protection device for reducing separation impact comprises: a bolt end cap 1, an outer shell 2 and a threaded energy absorbing inner shell 3. The bolt end cap 1 is connected to one end of the explosive bolt; the threaded energy absorbing inner shell 3 is located in the outer shell 2 to form a combination; the combination is connected to the explosive bolt box on the rocket shell; the other end of the explosive bolt is screwed into the explosive bolt box.

[0046] In this embodiment, the explosive bolt can specifically be a large-tonnage (30-tonnage) explosive bolt, that is, the large-tonnage explosive bolt friction energy dissipation protection device for reducing separation shock can reduce the separation shock when the 30-tonnage explosive bolt explodes.

[0047] In this embodiment, if Figure 5 and Figure 6 As shown, the bolt end cap 1 includes: a column section A101 and a cone section 102. The height of the column section A101 is 9 mm, and the outer diameter of the column section A101 is Φ38.3 mm; the inner wall of the column section A101 is provided with an M24×1.5 thread, the thread length is 25 mm, and the bottom of the thread has a 3 mm thread backing groove. The end of the cone section 102 away from the column section A101 is a hexagonal structure 103; the height of the hexagonal structure 103 is 13 mm, and the distance between the opposite sides of the hexagonal structure 103 is 17 mm; the cone section 102 is connected to the explosive bolt through the hexagonal structure 103. The total height of the bolt end cap 1 is 38 mm; the material of the bolt end cap 1 is 7050 aluminum alloy.

[0048] In this embodiment, if Figure 3 and Figure 4 As shown, the outer shell 2 includes: a column segment B201, two side ears 202, two bolt holes A4 and two bolt holes B5. Among them, the two side ears 202 are respectively located on both sides of the column segment B201; the two bolt holes A4 are respectively arranged on the two side ears 202; and the two bolt holes B5 are respectively arranged on the two side ears 202. The outer diameter of the column segment B201 is Φ56mm and the height is 73mm; the inner diameter of the column segment B201 is Φ46mm and the height is 67mm. The end face distance between the two side ears 202 is 75mm; the distance between the two side ears 202 protruding from the upper end face of the column segment B201 is between 10 and 12mm. The diameter of the bolt hole A4 is greater than the diameter of the bolt hole B5; the bolt hole A4 is 13mm away from the upper end face of the column segment B201, and the bolt hole B5 is 31mm away from the upper end face of the column segment B201. The outer shell 2 is made of 7050 aluminum alloy.

[0049] Preferably, the bolt hole A4 is an M12×1.5 threaded hole, and the bolt hole B5 is an M4 threaded hole.

[0050] In this embodiment, if Figure 7 and Figure 8 As shown, the threaded energy absorbing inner shell 3 is a cylindrical structure, the outer diameter of the threaded energy absorbing inner shell 3 is Φ46 mm, the inner diameter is M40×3 thread, the height is 47.5 mm, and the material of the threaded energy absorbing inner shell 3 is 7050 aluminum alloy.

[0051] In this embodiment, when the explosive bolt is working, an impact force is generated, and the broken explosive bolt moves downward with the bolt end cap 1, and the bolt end cap 1 falls into the threaded energy-absorbing inner shell 3, and friction movement occurs with the internal threads of the threaded energy-absorbing inner shell 3. The friction shear destroys the internal threads of the threaded energy-absorbing inner shell 3 and consumes kinetic energy, thereby realizing a buffering function and reducing the impact on the rocket shell.

[0052] In this embodiment, during assembly, the following steps are performed: placing the assembly at the explosive bolt box of the rocket shell, ensuring that the center hole of the assembly is coaxial with the explosive bolt mounting hole on the explosive bolt box, and aligning the bolt hole A4 and the two bolt holes B5 with the corresponding connection holes on the explosive bolt box. Two connecting bolts A and two connecting bolts B pass through the two bolt holes A4 and the two bolt holes B5 respectively to connect the assembly to the explosive bolt box. One end of the explosive bolt is screwed into the bolt end cap 1 and glue is applied to prevent loosening. The explosive bolt connected with the bolt end cap 1 is passed through the center hole of the assembly and screwed into the explosive bolt mounting hole on the explosive bolt box to complete the assembly. Among them, the connecting bolt A plays a shearing role, and the connecting bolt B plays a limiting role.

[0053] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

[0054] The contents not described in detail in the specification of the present invention belong to the common knowledge of the professionals in this field.

Claims

1. A friction energy dissipation protection device for large-tonnage explosive bolts for reducing separation impact, characterized in that: include: Bolt end cap (1), outer shell (2) and threaded energy absorbing inner shell (3); The bolt end cap (1) is connected to one end of an explosive bolt; wherein the explosive bolt is a 30-ton explosive bolt; The threaded energy-absorbing inner shell (3) is located inside the outer shell (2) to form a combined body; the combined body is connected to the explosive bolt box on the rocket shell; The other end of the explosive bolt is screwed into the explosive bolt box; The bolt end cap (1) comprises: a column section A (101) and a cone section (102); wherein the column section A (101) has a height of 9 mm and an outer diameter of Φ38.3 mm; an M24×1.5 thread is arranged on the inner wall of the column section A (101), the thread length is 25 mm, and a 3 mm thread backing groove is arranged at the bottom of the thread; an end of the cone section (102) away from the column section A (101) is a hexagonal structure (103), the height of the hexagonal structure (103) is 13 mm, and the distance between opposite sides of the hexagonal structure (103) is 17 mm; the cone section (102) is connected to the explosive bolt via the hexagonal structure (103); The outer shell (2) comprises: a column section B (201), two side ears (202), two bolt holes A (4) and two bolt holes B (5); wherein the two side ears (202) are respectively located on both sides of the column section B (201); the two bolt holes A (4) are respectively arranged on the two side ears (202); the two bolt holes B (5) are respectively arranged on the two side ears (202); the outer diameter of the column section B (201) is Φ56 mm and the height is 73 mm; The inner diameter of segment B (201) is Φ46 mm and the height is 67 mm; the end face distance between the two side ears (202) is 75 mm; the distance between the two side ears (202) and the upper end face of column segment B (201) is between 10 and 12 mm; the diameter of bolt hole A (4) is greater than the diameter of bolt hole B (5); the distance between bolt hole A (4) and the upper end face of column segment B (201) is 13 mm, and the distance between bolt hole B (5) and the upper end face of column segment B (201) is 31 mm; The threaded energy absorbing inner shell (3) is a cylindrical structure, the outer diameter of the threaded energy absorbing inner shell (3) is Φ46 mm, the inner diameter is M40×3 thread, and the height is 47.5 mm; When the explosive bolt is working, an impact force is generated, and the broken explosive bolt moves downward with the bolt end cap (1), and the bolt end cap (1) falls into the threaded energy absorbing inner shell (3), and friction movement occurs with the internal threads of the threaded energy absorbing inner shell (3), and friction shearing destroys the internal threads of the threaded energy absorbing inner shell (3) and consumes kinetic energy, thereby achieving a buffering function and reducing the impact on the rocket shell; During assembly, there are: Place the assembly on the explosive bolt box of the rocket shell. During assembly, ensure that the center hole of the assembly is coaxial with the explosive bolt mounting hole on the explosive bolt box, and that the bolt hole A (4) and the two bolt holes B (5) are aligned with the corresponding connection holes on the explosive bolt box. Two connecting bolts A and two connecting bolts B respectively pass through two bolt holes A (4) and two bolt holes B (5) to connect the assembly to the explosive bolt box; wherein the connecting bolts A play a shearing role, and the connecting bolts B play a limiting role; Connecting the explosive bolt to the bolt end cap (1); The explosive bolt connected with the bolt end cap (1) is passed through the central hole of the assembly and screwed into the explosive bolt installation hole on the explosive bolt box to complete the assembly.

2. The friction energy dissipation protection device for large-tonnage explosive bolts for reducing separation impact according to claim 1 is characterized in that: The total height of the bolt end cap (1) is 38 mm; the material of the bolt end cap (1) is 7050 aluminum alloy.

3. The friction energy dissipation protection device for large-tonnage explosive bolts for reducing separation impact according to claim 1 is characterized in that: The outer shell (2) is made of 7050 aluminum alloy.

4. The friction energy dissipation protection device for large-tonnage explosive bolts for reducing separation impact according to claim 1 is characterized in that: Bolt hole A (4) is an M12×1.5 threaded hole, and bolt hole B (5) is an M4 threaded hole.

5. The friction energy dissipation protection device for large-tonnage explosive bolts for reducing separation impact according to claim 1 is characterized in that: The material of the threaded energy absorbing inner shell (3) is 7050 aluminum alloy.

6. The friction energy dissipation protection device for large-tonnage explosive bolts for reducing separation impact according to claim 1 is characterized in that: One end of the explosive bolt is screwed into the bolt end cap (1) and coated with glue to prevent it from loosening.

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