Integrated in-place buffering-locking device and method for small initiating explosive device

Abstract

The invention discloses an integrated in-place buffering-locking device and method for a small initiating explosive device, and relates to the technical field of locking and buffering of small initiating explosive action devices. The main body mechanism is formed by buckling an end cover and a shell; a moving cavity is formed in the shell, a limiting cavity communicated with the moving cavity is formed in the end cover, the limiting cavity and the moving cavity are coaxially arranged, the inner diameter of the limiting cavity is larger than that of the moving cavity, and the limiting cavity is located at the head end of the moving cavity; the moving mechanism comprises a head slidably arranged in the moving cavity and a driving part extending out of the tail end of the moving cavity, and the driving part is used for driving the head to linearly move along the axis of the moving cavity; the buffering mechanism is coaxially arranged at the head end of the head part, is made of a plastic deformation material and is integrally formed with the head part; in the structure of a miniature initiating explosive device, on the premise that design space is saved, in-place locking of a motion mechanism of the initiating explosive device is achieved, and in-place sufficient buffering of the motion mechanism is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of locking and buffering of small-sized pyrotechnic action devices, in particular to an integrated in-place buffering-locking device and method for small-sized pyrotechnic devices. Background Art

[0002] Among the functions of a fire-actuated actuator, there is usually a requirement that the moving mechanism must not rebound after it has been put into position. Currently, among the locking structures of fire-actuated actuators, the more typical structures are the tapered head-tapered hole structure, the snap ring lock structure, the claw structure, and the like. When the size of the tapered head-tapered hole structure is small, the increase in relative machining error and the increase in part stiffness make it more difficult to implement. The parts of the claw structure are relatively complex. When the size is small, the part stiffness is too large to be deformed and assembled, and the locking error is also large. Among these structures, the smallest size that can be achieved is the snap ring lock structure. However, since the size of the snap ring is limited by the machining level, heat treatment, and materials, the smallest design that can be achieved for this structure in current engineering applications is about Φ12. The remaining structures require larger radial and axial dimensions.

[0003] Furthermore, small-scale pyrotechnic devices are often used in electronic products and optical instruments. Generally, the impact of pyrotechnic devices must be less than 5,000g, while the impact of pyrotechnic devices is generally 8,000-10,000g. This requires the design of a buffer structure, usually a copper plate, honeycomb aluminum, or scraping structure, all of which require a large space to implement.

[0004] In addition, more importantly, the conventional locking structure and buffer structure are two different structures, which makes the product structure more complicated and has a larger number of components.

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

[0006] Therefore, for structures with a maximum diameter of less than Φ10 and a locking space of less than 2mm, a structure that can achieve locking in place is urgently needed. If this structure also has a buffering function, it can further save product space and facilitate the overall design of the product. Summary of the Invention

[0007] One of the purposes of the present invention is to provide an integrated buffering-locking device for small pyrotechnics, so as to realize the locking of the pyrotechnics' motion mechanism in place and the sufficient buffering of the motion structure in place in the structure of the micro pyrotechnic product while saving design space.

[0008] The second purpose of the present invention is to provide a small-scale pyrotechnic integrated into the position of buffering and locking method, so as to achieve the purpose of buffering and locking satellite pyrotechnic products.

[0009] In order to achieve one of the above purposes, the present invention adopts the following technical means: An integrated buffer-locking device for small-sized explosive devices, comprising: The main body is formed by fastening the end cover and the shell; A movable cavity is constructed in the shell, and a limiting cavity in communication with the movable cavity is constructed in the end cover. 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. A motion mechanism comprising a head slidably disposed within the movable cavity and a driving portion extending from a rear end of the movable cavity, the driving portion being configured to drive the head to move linearly along an axis of the movable cavity; The buffer mechanism is coaxially arranged at the head end of the head, is made of plastic deformable material, and is integrally formed with the head.

[0010] Preferably, the buffer mechanism is a metal pipe coaxially arranged with the head, and a restraining groove is provided on a side of the inner wall of the end cover facing the head, and the restraining groove is coaxially arranged with the metal pipe.

[0011] Furthermore, the inner diameter of the constraint groove is larger than the outer diameter of the metal pipe, and the difference is 0.1-0.2 mm.

[0012] Furthermore, the depth of the constraint groove is one tenth of the length of the metal pipe.

[0013] Furthermore, the metal pipe is made of 304 stainless steel.

[0014] Furthermore, the shell is constructed with a threaded connector, and the end cover is constructed with a threaded connection groove. The shell and the end cover are threadedly connected, and the clearance between the end of the threaded connector and the inner bottom surface of the threaded connection groove forms the limiting cavity. The movable cavity is coaxially arranged with the threaded connector and is connected to the limiting cavity from its end.

[0015] The present invention relates to an integrated buffer-locking device for small-sized explosive devices, which has the following beneficial effects during use: During cushioning, the movement of the head causes the buffer mechanism to interact with the end of the limiting cavity in the end cap. The buffer mechanism, under force, forms a corrugated outer wall. As the head continues to move, the buffer mechanism collapses, and while the end of the buffer mechanism is positioned, the main body expands outward, providing cushioning and reducing the impact on the head. After the buffer mechanism has expanded outward, it is embedded and positioned within the limiting cavity. The interaction between the expanded buffer mechanism and the limiting cavity locks the head in place, preventing it from rebounding or continuing to move.

[0016] The cooperation between the buffer mechanism and the limiting cavity enables the buffer mechanism to have a buffering function, thereby reducing the impact on the tiny pyrotechnic device in place; at the same time, the buffer mechanism has a locking function, allowing the buffer mechanism to achieve the locking of the tiny pyrotechnic device in place while completing the buffering.

[0017] The integrated cushioning mechanism and head make the entire device more compact while ensuring both cushioning and locking functions. Even for micro-fired actuators with a maximum diameter of 9mm and a locking clearance of 2mm, it can achieve both cushioning and locking.

[0018] In addition, in order to achieve the second purpose of the present invention, a miniaturized initiator in-place buffering-locking method is provided, which adopts the aforementioned miniaturized initiator in-place buffering-locking device; First, the axial length of the buffer mechanism and the depth of the restraining groove are determined according to the buffering requirements to ensure that the buffer mechanism forms a collapsed state with the tube body expanding outward; By adjusting the distance between the end cover and the shell, the depth of the limit cavity is adjusted to ensure that the buffer mechanism is stably locked after the tube body is expanded and collapsed. By adjusting the inner diameter of the buffer mechanism, the buffering degree and locking force of the buffer mechanism can be adjusted; The driving part is connected to the action end of the pyrotechnic device, and the expansion and contraction of the buffer mechanism is used to buffer and position the small pyrotechnic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention.

[0020] Figure 2 Schematic diagram of the structure of the end cover of the present invention.

[0021] Figure 3 It is a structural schematic diagram of the motion mechanism of the present invention.

[0022] Figure 4 This is a schematic diagram of the locking state structure of the present invention (the expanded part of the actual metal pipe fills the limiting cavity).

[0023] Among them, 1-end cover, 2-shell, 3-moving cavity, 4-limiting cavity, 5-head, 6-driving part, 7-buffer mechanism, 8-constraint groove, 9-threaded connector, 10-threaded connection groove. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0026] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition or explanation in subsequent drawings.

[0028] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is typically placed when in use, or are the orientations or positional relationships commonly understood by those skilled in the art. These terms are intended only to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0030] Please refer to Figure 1 、 Figure 2 as well as Figure 3 As shown, a small-sized pyrotechnic integrated position buffer-locking device includes an end cover 1, a shell 2, a movable cavity 3, a limiting cavity 4, a motion mechanism, and a buffer mechanism 7 arranged on the end face of the motion mechanism head 5.

[0031] The end cover 1 and the shell 2 serve as the main body, and the two can be formed as one piece or as Figure 1 As shown, the two are threadedly connected.

[0032] A movable cavity 3 is provided in the housing 2 along the axial direction, and the movable cavity 3 passes through from the housing 2 toward one end of the end cover 1. At the same time, a limiting cavity 4 is provided in the end cover 1, and the limiting cavity 4 passes through from the end cover 1 toward one end of the housing 2.

[0033] Furthermore, after the end cap 1 and the housing 2 are fastened together to form the main body, the limiting cavity 4 is in a coaxially connected state with the movable cavity 3. Moreover, it is necessary to ensure that the inner diameter of the limiting cavity 4 is larger than the inner diameter of the movable cavity 3, so that the cavity formed by the limiting cavity 4 and the movable cavity 3 after being connected is a T-shaped structure.

[0034] Specifically, when the shell 2 and the end cover 1 are connected by threads. The first end of the shell 2 serves as the through end of the movable chamber 3, and the outer wall of the first end is coaxially provided with an external thread to form a threaded connector 9. The end cover 1 is coaxially constructed with an inward-recessed threaded connection groove 10 at one end facing the shell 2. Among them, the inner wall of the threaded connection groove 10 is coaxially provided with an internal thread for threaded connection with the aforementioned external thread. Moreover, the extension length of the aforementioned internal thread along the axis is less than the depth of the threaded connection groove 10. In this way, in the process of installing the threaded connector 9 into the threaded connection groove 10 through the matching of internal / external threads, when it is installed in place, a gap is formed between the inner bottom surface of the threaded connection groove 10 and the end of the threaded connector 9, and this gap is the limiting chamber 4 connected to the movable chamber 3.

[0035] Moreover, based on the aforementioned configuration, both the threaded connector 9 and the threaded connection groove 10 are cylindrical. Thus, after the threaded connector 9 is installed in the threaded connection groove 10, no specific machining is required, and only the corresponding cylindrical groove body and the corresponding matching cylindrical column body need to be formed to form the limiting cavity 4 with an inner diameter larger than the inner diameter of the moving cavity 3.

[0036] For the aforementioned motion mechanism, you 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 device.

[0037] In this embodiment, the movement mechanism includes a head portion 5 slidably disposed in the movement cavity 3 and a driving portion 6 extending from the rear end of the movement cavity 3 .

[0038] The head 5 is a piston head structure, and its outer wall is matched with the inner wall of the moving cavity 3, and the clearance is preferably controlled within 0.1 mm to ensure that the head 5 can be well radially limited in the moving cavity 3 while ensuring smooth axial movement.

[0039] The driving portion 6 is a piston rod structure coaxially connected to the head 5, which is used to drive the head 5 to move linearly along the axis of the movable chamber 3. The driving force here is provided by the portion of the driving portion 6 extending from the housing 2 and connected to the pyrotechnic device actuation device.

[0040] The key is the buffer mechanism 7 integrally formed at the head end of the head 5. Figure 1 and Figure 3 shown.

[0041] In this embodiment, the buffer mechanism 7 is coaxially arranged at the head end of the head 5 and is made of a plastic deformation material, preferably 304 stainless steel.

[0042] 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 expands and collapses during the buffering operation. This allows the metal pipe to form an outward-expanding positioning portion embedded in the limiting cavity 4 while providing buffering. Furthermore, the outer diameter of the metal pipe is the same as that of the head 5 of the movement mechanism. This ensures 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 metal pipe to achieve locking in place despite a slight outward-expanding and collapsing deformation when it is locked in place.

[0043] In another embodiment, a restraining groove 8 coaxially matched with the head 5 is provided on the side of the inner wall of the end cover 1 facing the head 5, that is, the side where the metal pipe and the end cover 1 abut during the buffering process.

[0044] The constraint groove 8 is used to insert the head end of the metal pipe. It is mainly used to ensure that the expansion type collapse of the metal pipe occurs on the pipe body of the metal pipe when the metal pipe is buffered.

[0045] Under the action of the restraining groove 8, the metal pipe will not come into contact with the bottom surface of the end cap 1 until it extends into the restraining groove 8. In this way, when the metal pipe undergoes an outward expansion type collapse, its head end is restrained by the restraining groove 8, so that the outward expansion state can only occur on the pipe body of the metal pipe.

[0046] To ensure stable outward expansion and collapse, the restraining groove 8, which acts as a stop against the outer wall of the metal pipe's head end, has an inner diameter that is 0.1-0.2 mm larger than the metal pipe's outer diameter. Furthermore, the depth of the restraining groove 8 is one-tenth the length of the metal pipe. This ensures that the metal pipe's head end is well restrained while also maintaining sufficient outward expansion and collapse length, ensuring both cushioning performance and a stable locking mechanism.

[0047] The following combination Figures 1 to 4 , explaining how to buffer and lock miniaturized pyrotechnics in place based on a small pyrotechnic integrated position buffering and locking device involved in this application.

[0048] First, it is necessary to integrate a buffer-locking device into place based on any small-scale pyrotechnic device involved in the aforementioned embodiments.

[0049] First, based on the buffering requirements, determine the buffer mechanism 7, that is, the axial length of the metal pipe and the depth of the restraining groove 8. Referring to the above, the depth of the restraining 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 expanded outward.

[0050] Then, the depth of the limiting cavity 4 can be adjusted by adjusting the distance between the end cover 1 and the shell 2, that is, the length of the external thread and the internal thread extending axially when the end cover 1 and the shell 2 are connected by threaded fastening, that is, adjusting the distance between the end of the threaded connector 9 and the inner bottom surface of the threaded connection groove 10, thereby ensuring that the metal pipe serving as the buffer mechanism 7 can fill the limiting cavity 4 after the tube body expands and contracts outside, thereby achieving stable locking.

[0051] Furthermore, it is also 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, to adjust the in-place buffering degree and locking force of the buffer mechanism 7.

[0052] Finally, the driving part 6 of the motion mechanism is connected to the action end of the pyrotechnic, and the action of the pyrotechnic is used to drive the head 5 to move through the driving part 6, so that the expansion and contraction of the buffer mechanism 7 is used to buffer and position the small pyrotechnic in place.

[0053] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A small-sized explosive device integrated in-place buffer-locking device, characterized in that: include: The main body is formed by fastening the end cover (1) and the housing (2); A movable cavity (3) is constructed in the shell (2), and a limiting cavity (4) communicating with the movable cavity (3) is constructed in the end cover (1). The limiting cavity (4) and the movable cavity (3) are coaxially arranged, 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); A motion mechanism comprising a head (5) slidably disposed in the movable cavity (3) and a driving portion (6) extending from the rear end of the movable cavity (3), wherein the driving portion (6) is used to drive the head (5) to move linearly along the axis of the movable cavity (3); The buffer mechanism (7) is coaxially arranged at the head end of the head (5), is made of plastic deformable material, and is integrally formed with the head (5).

2. The integrated buffer-locking device for small-sized explosive devices according to claim 1, characterized in that: The buffer mechanism (7) is a metal pipe coaxially arranged with the head (5); a restraining groove (8) is provided on a side of the inner wall of the end cover (1) facing the head (5); and the restraining groove (8) is coaxially arranged with the metal pipe.

3. The integrated buffer-locking device for small explosive devices 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 0.1-0.2 mm.

4. A small-sized explosive device integrated in-place buffer-locking device according to claim 2 or 3, characterized in that: The depth of the restraining groove (8) is one tenth of the length of the metal pipe.

5. The integrated buffer-locking device for small-sized explosive devices according to claim 2, characterized in that: The metal pipe is selected to be 304 stainless steel.

6. The integrated buffer-locking device for small-sized explosive devices according to claim 1, characterized in that: The shell (2) is constructed with a threaded connector (9), and the end cover (1) is constructed with a threaded connection groove (10). The shell (2) and the end cover (1) are threadedly connected, and the end of the threaded connector (9) and the inner bottom surface of the threaded connection groove (10) are clearance-matched to form the limiting cavity (4). The movable cavity (3) is coaxially arranged with the threaded connector (9) and is connected to the limiting cavity (4) from its end.

7. A miniaturized initiator buffer-locking method, characterized in that: A small-sized explosive device integrated into position buffer-locking device according to any one of claims 1 to 6 is used; First, according to the buffering requirements, the axial length of the buffer mechanism (7) and the depth of the constraint groove (8) are determined to ensure that the buffer mechanism (7) forms a collapsed state with the tube body expanded outward; By adjusting the distance between the end cover (1) and the housing (2), the depth of the limiting cavity (4) is adjusted to ensure that the buffer mechanism (7) is stably locked after the tube body is expanded and collapsed; By adjusting the inner diameter of the buffer mechanism (7), the in-place buffering degree and locking force of the buffer mechanism (7) are adjusted; The driving part (6) is connected to the action end of the pyrotechnic device, and the expansion and contraction of the buffer mechanism (7) is used to buffer and position the small pyrotechnic device.

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