An integrated positioning buffer and locking device and method for small pyrotechnic items

Abstract

This invention discloses an integrated positioning buffer-locking device and method for small pyrotechnic devices, relating to the field of locking and buffering technology for small pyrotechnic action devices. The invention includes: a main body structure formed by the snap-fitting of an end cap and a housing; a movable cavity within the housing, and a limiting cavity communicating with the movable cavity within the end cap, the limiting cavity and the movable cavity being coaxially arranged, the inner diameter of the limiting cavity being larger than the inner diameter of the movable cavity, and the limiting cavity being located at the head end of the movable cavity; a motion mechanism including a head slidably disposed within the movable cavity and a driving part extending from the tail end of the movable cavity, the driving part being used to drive the head to move linearly along the axis of the movable cavity; and a buffer mechanism coaxially disposed at the head end of the head, being made of a plastic deformation material and integrally formed with the head; thereby achieving, within the structure of a miniature pyrotechnic product, both positioning and locking of the pyrotechnic device's motion mechanism and sufficient buffering of the motion structure upon positioning, while saving design space.

Description

Technical Field

[0001] This invention relates to the field of locking and buffering technology for small pyrotechnic devices, specifically, to an integrated positioning buffer-locking device and method for small pyrotechnic products. Background Technology

[0002] In the function of ignition actuators, there is usually a requirement that the moving mechanism must not spring back after reaching its working position. Currently, the most typical locking structures in ignition actuators include conical head-conical hole structures, snap ring lock structures, and claw structures. With conical head-conical hole structures, the increased machining error and increased part rigidity make implementation difficult when the dimensions are small. Claw structures are relatively complex; when the dimensions are small, the excessive rigidity prevents deformation during assembly, and the locking error is also relatively large. Currently, the snap ring lock structure can be implemented with the smallest possible dimensions. However, due to limitations in machining capabilities, heat treatment, and materials, the minimum design size for this structure in current engineering applications is approximately Φ12. The other structures require larger radial and axial dimensions.

[0003] Furthermore, small-sized pyrotechnic devices are frequently used in electronic products and optical instruments, where the pyrotechnics generally cannot withstand large impacts, with an impact requirement of less than 5000g. However, the impact force of a pyrotechnic device upon arrival at its destination typically ranges from 8000 to 10000g. This necessitates the design of a cushioning structure, typically using materials such as copper discs, honeycomb aluminum, or scrapers, all of which require a relatively large space to implement.

[0004] Furthermore, and more importantly, conventional positioning locking and buffering structures are two different structures, which makes the product structure more complex and increases the number of components.

[0005] Taking the simplest snap ring lock positioning and copper disc buffer as an example, in addition to the motion mechanism, at least two systems are needed to realize this function.

[0006] Therefore, for structures with a maximum diameter of less than Φ10 and a locking space of less than 2mm, there is an urgent need for a structure capable of achieving locking. If this structure also functions as a buffer, it can further save product space and facilitate the overall product design. Summary of the Invention

[0007] One of the objectives of this invention is to provide an integrated positioning buffer-locking device for small pyrotechnic products, so as to achieve both positioning and locking of the pyrotechnic product's moving mechanism and sufficient buffering of the moving structure in the positioning process, while saving design space in the structure of the micro pyrotechnic product.

[0008] The second objective of this invention is to provide an integrated positioning buffer-locking method for small pyrotechnic products, so as to achieve the purpose of buffering and locking satellite pyrotechnic products.

[0009] To achieve one of the above objectives, the present invention employs the following technical means:

[0010] A small-sized integrated positioning buffer-locking device for pyrotechnic items includes:

[0011] The main structure is formed by the snap-fitting of end caps and housing;

[0012] The housing has a movable cavity, and the end cap has a limiting cavity that communicates with the movable cavity. The limiting cavity is coaxially arranged with the movable cavity, and the inner diameter of the limiting cavity is larger than the inner diameter of the movable cavity. The limiting cavity is located at the head end of the movable cavity.

[0013] The motion mechanism includes a head slidably disposed within the moving cavity and a drive unit extending from the tail end of the moving cavity, the drive unit being used to drive the head to move linearly along the axis of the moving cavity;

[0014] The buffer mechanism, coaxially located at the head end of the head, is made of a plastic deformation material and is integrally formed with the head.

[0015] Preferably, the buffer mechanism is a metal pipe coaxially arranged with the head, and the inner wall of the end cap facing the head is provided with a constraint groove, which is coaxially arranged with the metal pipe.

[0016] Furthermore, the inner diameter of the constraint groove is larger than the outer diameter of the metal pipe, and the difference is 0.1~0.2mm.

[0017] Furthermore, the depth of the constraint groove is one-tenth of the length of the metal pipe.

[0018] Furthermore, the metal pipe is made of 304 stainless steel.

[0019] Furthermore, the housing is constructed with a threaded connector, the end cap is constructed with a threaded connection groove, the housing and the end cap are threadedly connected, the end of the threaded connector and the inner bottom surface of the threaded connection groove are clearance-fitted to form the limiting cavity, and the moving cavity is coaxially arranged with the threaded connector and passes through the limiting cavity from its end.

[0020] The present invention relates to a small-sized integrated positioning buffer-locking device for pyrotechnic items, which has the following beneficial effects during use:

[0021] During cushioning, the movement of the head causes the cushioning mechanism to interact with the end of the limiting cavity of the end cap. Under pressure, the cushioning mechanism forms a corrugated outer wall. As the head continues to move, during the collapse process, the main body of the cushioning mechanism expands outward while its end is positioned, thus achieving cushioning and reducing the impact on the head. After expansion, the cushioning mechanism is embedded and positioned within the limiting cavity. The interaction between the expanded cushioning mechanism and the limiting cavity locks the head in place, preventing rebound or continuous movement.

[0022] By cooperating with the limiting cavity, the buffer mechanism simultaneously provides a buffering function, reducing the impact of small pyrotechnic items upon arrival; and also provides a locking function. This allows the buffer mechanism to simultaneously perform buffering and lock the small pyrotechnic items into place.

[0023] The integrated, molded buffer mechanism and head allow the entire device to achieve both buffering and locking functions while maintaining a more compact overall structure. Even for micro-sized fire-working devices with a maximum diameter of 9mm and a locking space of 2mm, it is possible to achieve both buffering and locking at the designated position.

[0024] In addition, to achieve the second objective of the present invention, a method for miniaturized pyrotechnic items to be positioned and buffered and locked is provided, which employs the aforementioned integrated positioning and buffering and locking device for miniaturized pyrotechnic items.

[0025] First, based on the buffering requirements, determine the axial length of the buffering mechanism and the depth of the constraint groove to ensure that the buffering mechanism forms a collapsed state with the tube body expanding outward.

[0026] By adjusting the distance between the end cap and the housing, the depth of the limiting cavity is adjusted to ensure stable locking of the buffer mechanism after the tube expands and collapses.

[0027] The degree of cushioning and the locking force of the cushioning mechanism can be adjusted by adjusting the inner diameter of the cushioning mechanism.

[0028] The drive unit is connected to the moving end of the pyrotechnic device, and the expansion and contraction of the buffer mechanism is used to buffer and position the small pyrotechnic device. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the present invention.

[0030] Figure 2 This is a schematic diagram of the end cap structure of the present invention.

[0031] Figure 3 This is a schematic diagram of the motion mechanism of the present invention.

[0032] Figure 4This is a schematic diagram of the locking state structure of the present invention (the actual metal pipe's outward expansion portion fills the limiting cavity).

[0033] Among them, 1-end cap, 2-shell, 3-moving cavity, 4-limiting cavity, 5-head, 6-driving part, 7-buffering mechanism, 8-constraint groove, 9-threaded connector, 10-threaded connection groove. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0036] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other.

[0037] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0038] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0039] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] Please refer to Figure 1 , Figure 2 as well as Figure 3 As shown, a small pyrotechnic integrated positioning buffer-locking device includes an end cap 1, a housing 2, a moving cavity 3, a limiting cavity 4, a moving mechanism, and a buffer mechanism 7 disposed on the end face of the head 5 of the moving mechanism.

[0041] Among them, the end cap 1 and the shell 2 serve as the main structure, and the two can be integrally formed or as shown in the figure. Figure 1 As shown, the two are connected by threads.

[0042] A movable cavity 3 is provided inside the housing 2 along the axial direction, and the movable cavity 3 extends from the end of the housing 2 toward the end cover 1. At the same time, a limiting cavity 4 is provided inside the end cover 1, and the limiting cavity 4 extends from the end of the end cover 1 toward the end of the housing 2.

[0043] Furthermore, after the end cap 1 and the housing 2 are fastened together to form the main body mechanism, the limiting cavity 4 and the moving cavity 3 are in a coaxial communication state. Moreover, it is necessary to ensure that the inner diameter of the limiting cavity 4 is larger than the inner diameter of the moving cavity 3, so that the cavity formed after the limiting cavity 4 and the moving cavity 3 are connected is a T-shaped structure.

[0044] Specifically, when the housing 2 and end cap 1 are connected by threads, the first end of the housing 2 serves as the through end of the movable cavity 3, and the outer wall of the first end is coaxially provided with external threads to form a threaded connector 9. The end cap 1 facing the housing 2 is coaxially constructed with a recessed threaded connection groove 10. The inner wall of the threaded connection groove 10 is coaxially provided with internal threads for threaded connection with the aforementioned external threads. Furthermore, the extension length of the aforementioned internal threads along the axis is less than the depth of the threaded connection groove 10. Thus, during the process of inserting the threaded connector 9 into the threaded connection groove 10 through the matching of internal and external threads, a gap is formed between the inner bottom surface of the threaded connection groove 10 and the end of the threaded connector 9 after insertion. This gap is the limiting cavity 4 that communicates with the movable cavity 3.

[0045] Furthermore, based on the aforementioned configuration, both the threaded connector 9 and the threaded connecting groove 10 are cylindrical. Thus, after the threaded connector 9 is inserted into the threaded connecting groove 10, no specific machining is required. Only the corresponding cylindrical groove and the corresponding matching cylindrical column need to be formed to create a limiting cavity 4 with an inner diameter larger than the inner diameter of the moving cavity 3.

[0046] For the aforementioned sports institutions, they can continue to combine Figure 1 As shown, the function of the motion mechanism is to connect with the working motion end of the pyrotechnic item.

[0047] In this embodiment, the motion mechanism includes a head 5 that is slidably disposed within the moving cavity 3 and a drive part 6 that extends from the tail end of the moving cavity 3.

[0048] The head 5 here is a piston head structure. Its outer wall is fitted with the inner wall of the moving cavity 3 with a clearance fit. The clearance is preferably controlled within 0.1mm to ensure that the head 5 can be well radially limited in the moving cavity 3 while ensuring smooth axial movement.

[0049] The drive unit 6 here serves as a piston rod structure coaxially connected to the head 5, and is used to drive the head 5 to move linearly along the axis of the moving cavity 3. The driving force is provided by the portion of the drive unit 6 extending out of the housing 2 and connected to the pyrotechnic actuation device.

[0050] The key component is the buffer mechanism 7, integrally formed at the head end of the aforementioned head 5. Specifically, it can be combined with... Figure 1 and Figure 3 As shown.

[0051] In this embodiment, the buffer mechanism 7 is coaxially located at the head end of the head 5 and is made of a plastic deformation material. Specifically, it is preferably made of 304 stainless steel.

[0052] The buffer mechanism 7 is configured as a metal pipe coaxially arranged with the head 5. Specifically, the buffer mechanism 7 is configured as a metal pipe, so that when the metal pipe acts as the buffer mechanism 7, it undergoes outward expansion and collapse during buffering operations. This allows for the simultaneous formation of an outwardly expanding positioning part embedded in the limiting cavity 4 while providing buffering. Simultaneously, the outer diameter of the metal pipe is the same as the outer diameter of the head 5 of the moving mechanism, ensuring that the gap between the outer wall of the metal pipe and the inner wall of the moving cavity 3 is also less than 0.1 mm. This allows the small outward expansion and collapse deformation of the metal pipe to achieve positioning and locking when it is in the locked position.

[0053] In another embodiment, a constraint groove 8 coaxially matched with the head 5 is provided on the inner wall of the end cap 1 facing the head 5, that is, the side where the aforementioned metal pipe and the end cap 1 abut during the buffering process.

[0054] The constraint groove 8 here is used to insert the head end of the metal pipe. It is mainly used to ensure that the outward expansion and collapse of the metal pipe occurs on the pipe body when the metal pipe is used for buffering.

[0055] Under the action of the constraint groove 8, the metal pipe extends into the constraint groove 8 before it comes into contact with the bottom surface of the end cap 1. In this way, when the metal pipe undergoes outward expansion and collapse, its head end is constrained by the fiber of the constraint groove 8, so that the outward expansion state can only occur on the pipe body of the metal pipe.

[0056] When the constraint groove 8 limits the outer wall of the metal pipe's head end, it ensures stable outward expansion and collapse of the metal pipe. The inner diameter of the constraint groove 8 is larger than the outer diameter of the metal pipe by 0.1~0.2mm, and the depth of the constraint groove 8 is one-tenth the length of the metal pipe. This design of the constraint groove 8 ensures that the head end of the metal pipe is well limited while also guaranteeing sufficient outward expansion and collapse length. This ensures both buffering performance and a sufficient outward expansion and collapse portion, guaranteeing stable locking capability.

[0057] The following is combined Figures 1 to 4 This paper explains how a small pyrotechnic integrated positioning buffer-locking device, based on the present application, performs positioning buffer-locking on miniaturized pyrotechnics.

[0058] First, it is necessary to use an integrated positioning buffer-locking device for any small pyrotechnic item involved in the aforementioned embodiments.

[0059] First, based on the buffering requirements, determine the buffer mechanism 7, i.e., the axial length of the metal pipe and the depth of the constraint groove 8. Referring to the above, the depth of the constraint groove 8 is set to one-tenth of the circumferential length of the metal pipe to ensure that the buffer mechanism 7 forms a collapsed state with the pipe body expanding outward.

[0060] Then, the depth of the limiting cavity 4 can be adjusted by adjusting the distance between the end cap 1 and the housing 2, that is, the length of the external thread and the internal thread extending axially when the end cap 1 and the housing 2 are connected by threaded fastening. In other words, the distance between the end of the threaded connector 9 and the inner bottom surface of the threaded connection groove 10 can be adjusted to ensure that the limiting cavity 4 can be filled after the metal pipe, which serves as the buffer mechanism 7, expands and collapses, thereby achieving stable locking.

[0061] Furthermore, it is necessary to adjust the inner diameter of the buffer mechanism 7, that is, to select a metal pipe with a suitable inner diameter while ensuring that the outer diameter of the metal pipe remains unchanged, in order to adjust the buffering degree and locking force of the buffer mechanism 7.

[0062] Finally, the drive unit 6 of the motion mechanism is connected to the moving end of the pyrotechnic item. The movement of the pyrotechnic item is used to drive the head 5 through the drive unit 6, thereby using the expansion and contraction of the buffer mechanism 7 to buffer and position the small pyrotechnic item.

[0063] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A small-scale integrated positioning buffer-locking device for pyrotechnic items, characterized in that, include: The main structure is formed by the snap-fitting of the end cap (1) and the shell (2); The housing (2) has a movable cavity (3) inside, and the end cap (1) has a limiting cavity (4) communicating with the movable cavity (3) inside. The limiting cavity (4) is coaxially arranged with the movable cavity (3), and the inner diameter of the limiting cavity (4) is larger than the inner diameter of the movable cavity (3). The limiting cavity (4) is located at the head end of the movable cavity (3). The motion mechanism includes a head (5) slidably disposed in the moving cavity (3) and a drive part (6) extending from the tail end of the moving cavity (3), the drive part (6) being used to drive the head (5) to move linearly along the axis of the moving cavity (3); The buffer mechanism (7) is coaxially located at the head end of the head (5), and is made of plastic deformation material, and is integrally formed with the head (5).

2. The integrated positioning buffer-locking device for small pyrotechnic items according to claim 1, characterized in that, The buffer mechanism (7) is a metal pipe coaxially arranged with the head (5). The inner wall of the end cap (1) facing the head (5) is provided with a constraint groove (8), and the constraint groove (8) is coaxially arranged with the metal pipe.

3. The integrated positioning buffer-locking device for small pyrotechnic items according to claim 2, characterized in that, The inner diameter of the constraint groove (8) is larger than the outer diameter of the metal pipe, and the difference is 0.1~0.2mm.

4. A small integrated positioning buffer-locking device for pyrotechnic items according to claim 2 or 3, characterized in that, The depth of the constraint groove (8) is one-tenth of the length of the metal pipe.

5. A small-scale integrated positioning buffer-locking device for pyrotechnic items according to claim 2, characterized in that, The metal pipe is made of 304 stainless steel.

6. The integrated positioning buffer-locking device for small pyrotechnic items according to claim 1, characterized in that, The housing (2) is constructed with a threaded connector (9), and the end cap (1) is constructed with a threaded connection groove (10). The housing (2) and the end cap (1) are threadedly connected. The end of the threaded connector (9) and the inner bottom surface of the threaded connection groove (10) are fitted together to form the limiting cavity (4). The moving cavity (3) is coaxially arranged with the threaded connector (9) and passes through the limiting cavity (4) from its end.

7. A method for buffering and locking miniaturized pyrotechnic devices at their designated positions, characterized in that, The small pyrotechnic integrated positioning buffer-locking device according to any one of claims 1 to 6 is adopted; First, based on the buffer requirements, determine the axial length of the buffer mechanism (7) and the depth of the constraint groove (8) to ensure that the buffer mechanism (7) forms a collapsed state with the tube body expanding outward. By adjusting the distance between the end cap (1) and the housing (2), the depth of the limiting cavity (4) is adjusted to ensure stable locking of the buffer mechanism (7) after the tube body expands and collapses. The degree of buffering and locking force of the buffer mechanism (7) can be adjusted by adjusting the inner diameter of the buffer mechanism (7); The drive unit (6) is connected to the moving end of the pyrotechnic item, and the small pyrotechnic item is buffered and positioned by the expansion and collapse of the buffer mechanism (7).

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