An energy absorbing buffer capture device suitable for fire-driven devices

Abstract

The present invention discloses an energy-absorbing and buffering catcher suitable for a pyrotechnic device, comprising: an upper mounting shell, an energy-absorbing structure, a lower mounting shell, a spring claw bushing, and a pressure screw. One end of the upper mounting shell is connected to one end of the lower mounting shell; the energy-absorbing structure is disposed within the upper mounting shell; the spring claw bushing is disposed within the lower mounting shell and covers the outer surface of the connecting nut assembly and the screw structure of the pyrotechnic device; the other end of the lower mounting shell is connected to the connected component of the pyrotechnic device via the pressure screw. The present invention has the advantages of good energy-absorbing and buffering effect, low impact response, and convenient installation.

Description

Technical Field

[0001] The present invention belongs to the technical field of spacecraft structures, and in particular relates to an energy absorbing and buffering catcher suitable for a pyrotechnic actuator. Background Art

[0002] A variety of pyrotechnic devices are used in spacecraft. Explosive bolts, release nuts, and other pyrotechnic devices with connection and separation functions generate a rod-like structure that moves at high speed along the device's axis during operation. To prevent the moving object from creating debris and damaging other structures, a catcher is required to capture the high-speed rod-like structure. The resulting deceleration process generates a significant shock response, which can have a strong impact on nearby sensitive structures and components, resulting in adverse effects. Summary of the Invention

[0003] The technical problem solved by the present invention is to overcome the deficiencies of the prior art and provide an energy absorbing and buffering catcher suitable for a fire-operated actuator, which has the advantages of good energy absorbing and buffering effect, low impact response and convenient installation.

[0004] The object of the present invention is achieved through the following technical solutions: An energy-absorbing buffer capture device suitable for a fire-acting device, comprising: an upper mounting shell, an energy-absorbing structure, a lower mounting shell, a spring claw bushing and a pressure screw; wherein, one end of the upper mounting shell is connected to one end of the lower mounting shell; the energy-absorbing structure is arranged inside the upper mounting shell; the spring claw bushing is arranged inside the lower mounting shell, and the spring claw bushing covers the outer surface of the connecting nut group of the fire-acting device and the screw structure of the fire-acting device; the other end of the lower mounting shell is connected to the connected part of the fire-acting device through the pressure screw.

[0005] In the above-mentioned energy-absorbing and buffering capture device suitable for a fire-operated device, the lower mounting shell includes a lower mounting shell threaded section, a round through portion, an outward-turned flange and an upper end face of the lower mounting shell; wherein, one end of the round through portion is connected to the lower mounting shell threaded section, and the other end of the round through portion is connected to the outward-turned flange; a through hole is provided in the outward-turned flange, and one end of the pressure screw passes through the through hole and is connected to the connected part of the fire-operated device.

[0006] In the above-mentioned energy-absorbing and buffering capture device suitable for a fire-operated device, the pressure sheet screw includes a nut, a screw rod, a threaded column section and a pressure sheet ring; wherein the nut, the screw rod and the threaded column section are connected in sequence; the pressure sheet ring is sleeved on the outer surface of the screw rod, and the pressure sheet ring is press-connected with the nut.

[0007] The above-mentioned energy-absorbing buffer capture device suitable for a fire-operated device also includes: a screw buffer rubber ring; wherein, the screw buffer rubber ring is sleeved on the outer surface of the screw, and the screw buffer rubber ring is located between the pressure ring and the outward-turned flange.

[0008] The above-mentioned energy-absorbing buffering catcher suitable for a fire-operated device further includes: a catcher buffering rubber pad; wherein the catcher buffering rubber pad is located between the connected component and the outward-turned flange.

[0009] In the above-mentioned energy-absorbing buffer capture device suitable for a fire-operated device, the upper mounting shell includes an upper mounting shell threaded section and a middle end face; wherein, the upper mounting shell threaded section is connected to the lower mounting shell threaded section, the middle end face is arranged inside the upper mounting shell threaded section, and the middle end face is in contact with the upper end face of the lower mounting shell.

[0010] In the above-mentioned energy-absorbing buffer capture device suitable for a fire-operated device, the spring claw bushing includes a flange, a spring claw and a straight section; wherein, one end of the spring claw is connected to the flange, and one end of the straight section is connected to the flange; the spring claw and the straight section are arranged at intervals along the circumferential direction of the flange; an inner concave ring is provided at the bottom of the outward-turned flange, and the inner concave ring presses the flange against the upper surface of the capture device buffer rubber pad.

[0011] In the above energy-absorbing and buffering catcher suitable for a fire-operated actuator, the spring claw is an inward-turned arc spring cantilever.

[0012] In the above-mentioned energy-absorbing buffer capture device suitable for a fire-operated device, the energy-absorbing structure is a lattice structure composed of a plurality of lattice cells.

[0013] In the above-mentioned energy-absorbing and buffering capture device suitable for fire-operated devices, each lattice cell includes an inverted Σ-shaped structure, an intermediate connecting beam and a positive Σ-shaped structure; wherein, one end of the intermediate connecting beam is connected to the middle part of the inverted Σ-shaped structure, and the other end of the intermediate connecting beam is connected to the middle part of the positive Σ-shaped structure.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] (1) The present invention has no impact on the structure and function of the fire-operated actuator;

[0016] (2) The present invention has good energy absorption and buffering effect, low impact response, and good isolation from pyrotechnic shock, and can provide good environmental conditions for spacecraft components that require a low-impact environment;

[0017] (3) The device of the present invention has a compact structure, small dimensions, light weight and is easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0019] Figure 1 This is a schematic structural diagram of an energy absorbing buffer capture device applicable to a fire-operated actuator provided by an embodiment of the present invention;

[0020] Figure 2 This is a structural diagram of an upper mounting shell provided by an embodiment of the present invention;

[0021] Figure 3 This is an external view of the double Σ-shaped lattice energy absorption structure provided by an embodiment of the present invention.

[0022] FIG4( a ) is a schematic diagram of a double Σ-shaped lattice energy absorption structure according to an embodiment of the present invention;

[0023] FIG4( b ) is a schematic diagram of the structure of a lattice cell provided by an embodiment of the present invention;

[0024] FIG4( c ) is another schematic diagram of the structure of a lattice cell provided by an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the lower mounting shell structure provided by an embodiment of the present invention;

[0026] Figure 6 This is an appearance diagram of the spring claw bushing provided in an embodiment of the present invention.

[0027] Figure 7 This is an outline diagram of a compression screw provided by an embodiment of the present invention;

[0028] Figure 8 This is an outline diagram of a screw buffer rubber ring provided in an embodiment of the present invention;

[0029] Figure 9 This is an outline diagram of the capture buffer rubber pad provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, unless there is a conflict, the embodiments of the present disclosure and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] Figure 1 This is a schematic diagram of the structure of the energy absorbing buffer capture device applicable to the fire-driven device provided by the embodiment of the present invention. Figure 1 As shown, the energy absorbing buffer catcher suitable for a fire-operated device comprises an upper mounting shell 1, an energy absorbing structure 2, a lower mounting shell 3, a spring claw bushing 4 and a pressing screw 5.

[0032] One end of the upper mounting shell 1 is connected to one end of the lower mounting shell 3; the energy absorption structure 2 is arranged inside the upper mounting shell 1; the spring claw bushing 4 is arranged inside the lower mounting shell 3, and the spring claw bushing 4 covers the outer surface of the connecting nut group 9 of the fire-acting device and the screw structure 10 of the fire-acting device; the other end of the lower mounting shell 3 is connected to the connected part 8 of the fire-acting device through the pressure screw 5.

[0033] The energy absorbing and buffering catcher accommodates the connecting nut assembly 9 and the pyrotechnic device screw structure 10 under the claw bushing 4. The depth h01 of the nut and screw into the catcher is not greater than the distance h02 between the upper edge of the claw bushing and the lower end surface of the double Σ-shaped lattice energy absorbing structure 2.

[0034] The energy absorbing buffer catcher is fixed to the connected part 8 by the pressure screw 5. The threaded section 5.3 of the pressure screw is screwed into the corresponding threaded hole on the connecting part 8. The central through hole 6.1 of the screw buffer rubber ring 6 (such as Figure 8 The screw rod 5.2 passes through the through hole 3.2 on the outward flange 3.4 of the lower mounting shell 3 and the through hole 7.1 on the capture buffer pad 7 (as shown in FIG. Figure 9 The combined thickness h03 of the screw buffer rubber ring 6, the catcher buffer rubber pad 7 and the outer flange 3.4 of the lower mounting shell 3 is slightly smaller than the distance h5 between the lower end surface of the upper pressure ring 5.4 of the pressure screw and the lower end surface of the screw rod 5.2.

[0035] like Figure 5 As shown, the lower mounting shell 3 includes a lower mounting shell threaded section 3.3, a round portion 3.6, an outward-turned flange 3.4 and an upper end face 3.5 of the lower mounting shell; wherein, one end of the round portion 3.6 is connected to the lower mounting shell threaded section 3.3, and the other end of the round portion 3.6 is connected to the outward-turned flange 3.4; the outward-turned flange 3.4 is provided with a through hole 3.2, and one end of the pressure screw 5 passes through the through hole 3.2 and is connected to the connected part 8 of the fire-actuating device. Specifically, the lower mounting shell 3 is a rotary cylinder structure. An inner concave ring 3.1 is provided on its lower end face, which presses the outward-turned flange 4.1 of the claw bushing 4 onto the upper end face 7.2 of the capture buffer rubber pad 7. The inner diameter of the lower mounting shell 3 is and the outer diameter of the claw bushing 4 Form a transition fit.

[0036] like Figure 7As shown, the compression screw 5 includes a nut 5.1, a screw rod 5.2, a threaded column section 5.3 and a compression ring 5.4; wherein the nut 5.1, the screw rod 5.2 and the threaded column section 5.3 are connected in sequence; the compression ring 5.4 is sleeved on the outer surface of the screw rod 5.2, and the compression ring 5.4 is crimped with the nut 5.1.

[0037] like Figure 8 As shown, the energy absorbing and buffering catcher suitable for the fire-operated device also includes: a screw buffer rubber ring 6; wherein, the screw buffer rubber ring 6 is sleeved on the outer surface of the screw 5.2, and the screw buffer rubber ring 6 is located between the pressing ring 5.4 and the outward-turned flange 3.4.

[0038] like Figure 9 As shown, the energy-absorbing buffer capturer suitable for the fire-working device also includes: a capture buffer rubber pad 7; wherein, the capture buffer rubber pad 7 is annular, and the capture buffer rubber pad 7 is evenly provided with a plurality of through holes 7.1 along its circumferential direction, and each through hole corresponds to a pressure screw 5, and the screw 5.2 of the pressure screw 5 passes through the through hole 7.1 and is connected to the connecting member 8, and the center circular hole of the capture buffer rubber pad 7 is sleeved on the connecting nut group 9, and the inner side surface 7.3 of the capture buffer rubber pad 7 can contact the outer side surface of the connecting nut group 9, and the capture buffer rubber pad 7 is located between the connected member 8 and the outward-turned flange 3.4.

[0039] like Figure 2 As shown, the upper mounting shell 1 includes an upper mounting shell threaded section 1.1 and a middle end face 1.2; wherein, the upper mounting shell threaded section 1.1 is connected to the lower mounting shell threaded section 3.3, the middle end face 1.2 is arranged inside the upper mounting shell threaded section 1.1, and the middle end face 1.2 is in contact with the upper end face 3.5 of the lower mounting shell. Specifically, the upper mounting shell 1 is an inner cavity structure of a rotating body. The double Σ-shaped lattice energy absorption structure 2 is installed in the upper mounting shell 1, and the lower threaded section 1.1 is tightened with the threaded section 3.3 of the lower shell 3 until the middle end face 1.2 of the upper shell 1 is in contact with the upper end face 3.5 of the lower shell 3. The distance h1 between the middle end face 1.2 and the inner end face 1.3 of the upper shell 1 is slightly larger than the height h of the double Σ-shaped lattice energy absorption structure 2, so that the upper and lower end faces of the double Σ-shaped lattice energy absorption structure 2 are respectively pressed by the inner end face 1.3 of the upper shell 1 and the upper end face 3.5 of the lower shell 3. The inner diameter of the upper mounting shell 1 The outer diameter of the double Σ-shaped lattice energy absorbing structure 2 Form a clearance fit.

[0040] like Figure 6As shown, the claw bushing 4 includes a flange 4.1, a claw 4.2 and a straight section 4.3. Among them, one end of the claw 4.2 is connected to the flange 4.1, and one end of the straight section 4.3 is connected to the flange 4.1. The claw 4.2 is an inward-turned arc spring cantilever. The claw 4.2 and the straight section 4.3 are arranged at intervals along the circumferential direction of the flange. Specifically, a straight section 4.3 is set between two adjacent claws 4.2, and a claw 4.2 is set between two adjacent straight sections 4.3. The bottom of the outward-turned flange 3.4 is provided with an inner concave ring 3.1, and the inner concave ring 3.1 presses the flange 4.1 on the upper surface of the capture buffer rubber pad 7. The spacing X between the opposing claws is smaller than the diameter of the lower end face of the connecting nut group 9, forming a one-way reverse check structure.

[0041] like Figure 4a As shown, the energy absorbing structure 2 is a lattice structure composed of a plurality of lattice cells. Figure 4b As shown, each lattice cell comprises an inverted Σ-shaped structure 2.1, an intermediate connecting beam 2.2, and a positive Σ-shaped structure 2.3. One end of the intermediate connecting beam 2.2 is connected to the middle of the inverted Σ-shaped structure 2.1, while the other end is connected to the middle of the positive Σ-shaped structure 2.3. Specifically, the double Σ-shaped lattice energy-absorbing structure 2 has a cylindrical appearance. Viewed from the front, it has the form of a lattice structure with n1 H-direction x n2 radial elements. Each lattice cell is composed of a positive Σ-shaped structure 2.3, an inverted Σ-shaped structure 2.1, and an intermediate connecting beam 2.2. The characteristic parameters of the lattice cell are the angle α between the inclined wall of the Σ-shaped structure and the intermediate connecting beam 2.2, the cell height h, the cell width d, and the wall thickness t. These characteristic parameters and the number of cells are calculated using the equivalent density method to accommodate the speed and kinetic energy of the connecting nut assembly 9 and the screw structure 10 of the pyrotechnic actuator during high-speed motion. Furthermore, the double-Σ-shaped lattice cell can be adaptively transformed into a double-arc lattice cell 2.4 (as shown in FIG4(c)).

[0042] Among them, the double Σ-shaped lattice energy absorption structure and the claw bushing form a space for the screw and the connecting nut group to pass smoothly. The height constraint relationship is as follows:

[0043] h01≤h02≤h01+2;

[0044] Wherein h01 is the distance between the upper end face of the screw 10 and the upper end face of the connected part 8; h02 is the distance between the lower end face of the double Σ-shaped lattice energy absorption structure and the upper end face of the claw bushing.

[0045] The associated height formed by the thickness of the cushioning pad assembly after installation and the positioning height of the pressure screw ensures the cushioning performance while ensuring the positioning stiffness. The constraint relationship is as follows:

[0046] h03-0.5≤h5≤h03-0.2

[0047] Among them, h03 is the thickness of the buffer pad assembly after installation, and h5 is the positioning height in the pressure screw, that is, the length of the screw 5.2.

[0048] The outer diameter of the connecting nut assembly and the distance between the claws in the claw bushing form a relationship to ensure that the connecting nut assembly can pass smoothly and will not pass in the opposite direction. The constraint relationship is as follows:

[0049] Φ-2≤x≤Φ-1

[0050] Among them, Φ is the maximum outer diameter of the connecting nut group, and x is the distance between the opposing claws in the claw bushing.

[0051] The volume ratio of the double Σ-shaped lattice energy absorption structure refers to the ratio of the volume of the aluminum material in the structure to its outer envelope space. Its constraint relationship is as follows:

[0052] λ=Vk / V0

[0053]

[0054] 0.05≤λ≤0.1

[0055] Wherein, λ is the volume ratio of the double-Σ lattice energy absorbing structure, Vk is the volume of the material in the double-Σ lattice energy absorbing structure, V0 is the outer envelope volume of the double-Σ lattice energy absorbing structure, D is the outer diameter of the double-Σ lattice energy absorbing structure, and H is the height of the double-Σ lattice energy absorbing structure.

[0056] The above formula makes the device have good buffering and capturing effects.

[0057] The energy absorbing buffering catcher of the present invention is used in a certain explosive bolt-satellite-rocket separation device. The adapter of the separation device is provided with 6 threaded connection holes according to the fixing structure on the connected part 8.

[0058] The upper mounting shell 1 and the lower mounting shell 2 are made of 2A14 aluminum alloy.

[0059] The double-Σ lattice energy-absorbing structure 2 is made of AlSi10Mg powder particles, additively manufactured via 3D printing and then cut into shape. Its characteristic parameters include an angle α of 60°, a cell height h of 5.81 mm, a cell width d of 6.87 mm, and a wall thickness t of 0.3 mm. The lattice feature numbers n1 = 6 and n2 = 4.

[0060] The screw structure 10 of the fire-actuated actuator is an M12 screw of an explosive bolt. The connecting nut group 9 is a locking nut group formed by an M12 frustum nut and an M12 hexagonal nut.

[0061] The pressing screw 5 is made of titanium alloy and has an M6 thread. The screw buffer rubber ring 6 and the capture device buffer rubber pad 7 are made of silicone rubber.

[0062] The present invention has no impact on the structure and function of the pyrotechnic device; the present invention has good energy absorption and buffering effect, low impact response, and better isolation of pyrotechnic shock, and can provide good environmental conditions for spacecraft components that require a low-impact environment; the device of the present invention has a compact structure, small external dimensions, light structural weight, and is easy to install.

[0063] Although the present invention has been disclosed above in terms of preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solutions 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 solutions of the present invention shall fall within the scope of protection of the technical solutions of the present invention.

Claims

1. An energy absorbing buffer capture device suitable for a fire-driven device, characterized in that include: An upper mounting shell (1), an energy absorbing structure (2), a lower mounting shell (3), a spring claw bushing (4) and a pressing screw (5); wherein, One end of the upper mounting shell (1) is connected to one end of the lower mounting shell (3); The energy absorbing structure (2) is arranged inside the upper mounting shell (1); The spring claw bushing (4) is arranged inside the lower mounting shell (3), and the spring claw bushing (4) covers the outer surface of the connecting nut group (9) of the pyrotechnic device and the screw structure (10) of the pyrotechnic device; The other end of the lower mounting shell (3) is connected to the connected member (8) of the fire-actuated actuator via the pressure screw (5); The lower mounting shell (3) comprises a lower mounting shell threaded section (3.3), a round through portion (3.6), an outward-turned flange (3.4) and an upper end surface (3.5) of the lower mounting shell; wherein, One end of the round portion (3.6) is connected to the lower mounting shell threaded section (3.3), and the other end of the round portion (3.6) is connected to the outward-turned flange (3.4); The outward-turned flange (3.4) is provided with a through hole (3.2), and one end of the pressure screw (5) passes through the through hole (3.2) and is connected to the connected member (8) of the fire-actuated device; The energy absorbing structure (2) is a lattice structure composed of a plurality of lattice cells; Each lattice cell includes an inverted Σ-shaped structure (2.1), an intermediate connecting beam (2.2) and a positive Σ-shaped structure (2.3); wherein, One end of the middle connecting beam (2.2) is connected to the middle part of the inverted Σ-shaped structure (2.1), and the other end of the middle connecting beam (2.2) is connected to the middle part of the positive Σ-shaped structure (2.3); The volume ratio of the double Σ-shaped lattice energy absorption structure refers to the ratio of the volume of the aluminum material in the structure to its outer envelope space. Its constraint relationship is as follows: λ=Vk / V0; 0.05≤λ≤0.1; Wherein, λ is the volume ratio of the double-Σ lattice energy absorbing structure, Vk is the volume of the material in the double-Σ lattice energy absorbing structure, V0 is the outer envelope volume of the double-Σ lattice energy absorbing structure, D is the outer diameter of the double-Σ lattice energy absorbing structure, and H is the height of the double-Σ lattice energy absorbing structure.

2. The energy absorbing buffer capture device suitable for a fire-operated device according to claim 1, characterized in that: The compression screw (5) comprises a nut (5.1), a screw rod (5.2), a threaded column section (5.3) and a compression ring (5.4); wherein, The nut (5.1), the screw rod (5.2) and the threaded column section (5.3) are connected in sequence; The pressing ring (5.4) is sleeved on the outer surface of the screw rod (5.2), and the pressing ring (5.4) is press-connected with the nut (5.1).

3. The energy absorbing buffer capture device suitable for a fire-operated device according to claim 2, characterized in that Also includes: Screw buffer rubber ring (6); wherein, The screw buffer rubber ring (6) is sleeved on the outer surface of the screw rod (5.2), and the screw buffer rubber ring (6) is located between the pressing ring (5.4) and the outward-turned flange (3.4).

4. The energy absorbing buffer capture device suitable for a fire-operated device according to claim 2, characterized in that It also includes: a capturer buffer pad (7); wherein, The capture device buffer rubber pad (7) is located between the connected component (8) and the outward-turned flange (3.4).

5. The energy absorbing buffer capture device suitable for a fire-operated device according to claim 1, characterized in that: The upper mounting shell (1) comprises an upper mounting shell threaded section (1.1) and a middle end surface (1.2); wherein, The upper mounting shell threaded section (1.1) is connected to the lower mounting shell threaded section (3.3). The middle end surface (1.2) is arranged inside the threaded section (1.1) of the upper mounting shell, and the middle end surface (1.2) is in contact with the upper end surface (3.5) of the lower mounting shell.

6. The energy absorbing buffer capture device suitable for a fire-operated device according to claim 4, characterized in that: The spring claw bushing (4) comprises a flange (4.1), a spring claw (4.2) and a straight section (4.3); wherein, One end of the spring claw (4.2) is connected to the flange (4.1), and one end of the straight section (4.3) is connected to the flange (4.1); The spring claws (4.2) and the straight sections (4.3) are arranged at intervals along the circumferential direction of the flange; The bottom of the outward-turned flange (3.4) is provided with an inward-recessed ring (3.1), and the inward-recessed ring (3.1) presses the flange (4.1) onto the upper surface of the capture device buffer rubber pad (7).

7. The energy absorbing and buffering catcher suitable for a fire-operated device according to claim 6, characterized in that: The spring claw (4.2) is an inward-turned arc spring cantilever.

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