Initiating explosive device drive unlocking device and system

Abstract

The invention relates to the technical field of driving devices, in particular to an initiating explosive device driving unlocking device and system.The initiating explosive device driving unlocking device comprises an electric ignition device, a main shell, a cutter, a shear pin, a cutter anvil and a plug; the plug is fixed to the lower end of the main shell. The lower end of the cutter anvil makes contact with the upper end of the plug, and the upper end of the cutter anvil is provided with an inwards-concave blade falling groove. A shell mounting hole is formed in the side wall of the main shell, a cutter anvil mounting hole is formed in the cutter anvil, the cutter anvil mounting hole penetrates through the blade positioning groove, and the shell mounting hole is opposite to the cutter anvil mounting hole; the cutter is located above the cutter anvil, and the circumferential face of the upper section of the cutter makes contact with the inner wall of the mounting cavity of the main shell. A shear pin assembling groove is formed in the circumferential face of the cutter, a shear pin assembling hole is formed in the side wall of the main shell, and the shear pin penetrates into the shear pin assembling hole and the shear pin assembling groove. And the lower section of the electric ignition device is inserted into the mounting cavity from the upper end of the main shell. According to the method, the target cut part can be rapidly cut off, and it is guaranteed that the target cut part has high cutting performance.

Description

Technical Field

[0001] The present application relates to the technical field of drive devices, and in particular to a pyrotechnic drive unlocking device and system. Background Art

[0002] A pyrotechnic device is a device that consists of an ignition element, a charge and a functional mechanism, and releases large, concentrated energy to perform mechanical work through the explosion or combustion reaction of the charge. In various aerospace vehicles, pyrotechnic devices are used to complete a series of mechanical functions such as connection and release, cutting and crushing, valve opening and closing, and are one-time actuating devices.

[0003] Pyrotechnic devices include: detonators, explosive transmission devices, separation devices, pyrotechnic drive unlocking devices and safety control devices, among which pyrotechnic drive unlocking devices, as an important branch, play an important role in various spacecraft. Whether the pyrotechnic drive unlocking device can quickly cut off the target parts and ensure that it has high cutting performance plays a very important role in the successful launch of the spacecraft.

[0004] In addition, due to the limitations of the launch vehicle envelope and the influence of its vibration environment, many components must be in a folded and compressed state during the launch and flight of the spacecraft. When the spacecraft reaches the predetermined orbit, these components are unlocked and deployed. The pyrotechnic driven unlocking device has gradually developed with the development of on-orbit deployment and separation technology. It can not only realize the compression of spacecraft components, but also realize the unlocking or separation of spacecraft components according to the specified requirements.

[0005] At present, with the continuous expansion of my country's aerospace field, aerospace products are developing in the direction of deep space exploration, multi-satellite networking and micro-spacecraft. Space folding and unfolding mechanisms have played an irreplaceable role in aerospace engineering and are the energy source for satellites to work in orbit. With the continuous deepening of aerospace research and the increasing complexity of aerospace mission requirements, the functional requirements for solar cell arrays and their unfolding and unlocking mechanisms are becoming higher and higher. With the growing demand for satellites and the rapid expansion of the satellite industry, the demand for pyrotechnic drive unlocking devices will also grow explosively and the requirements will become higher and higher. In addition, with the continuous improvement of the requirements for lightweight spacecraft, the requirements for miniaturization, lightweight and integration of pyrotechnic drive unlocking devices are also becoming higher and higher.

[0006] Therefore, how to make the pyrotechnic-driven unlocking device quickly cut off the target workpiece to ensure that it has high cutting performance, and how to achieve the miniaturization and lightweight of the pyrotechnic-driven unlocking device are technical problems that technical personnel in this field urgently need to solve. Summary of the invention

[0007] The present application provides a pyrotechnic driven unlocking device and system, which can quickly cut off the target workpiece to ensure that it has high cutting performance, and realize the miniaturization and lightweight of the product through highly integrated and high-density energy design.

[0008] In order to solve the above technical problems, this application provides the following technical solutions:

[0009] A device for driving and unlocking an explosive device comprises: an electric ignition device, a main shell, a cutter, a shear pin, an anvil and a screw plug; wherein the main shell has an installation cavity extending through the upper and lower ends, and the screw plug is fixed to the lower end of the main shell to close the installation cavity from the lower end of the main shell; the anvil is located in the installation cavity of the main shell, and the lower end of the anvil contacts the upper end of the screw plug, and the upper end of the anvil has an inwardly concave blade seating groove; a shell loading hole extending radially is provided on the side wall of the main shell, and an anvil loading hole extending radially is provided on the anvil, and the anvil loading hole passes through the blade seating groove, and the shell loading hole is opposite to the anvil loading hole; the cutter is located in the installation cavity of the main shell, and the cutter is located above the anvil, the circumference of the upper section of the cutter contacts the inner wall of the installation cavity, and the lower section of the cutter can extend into the blade seating groove to cooperate with the anvil; the circumference of the cutter has an inwardly concave shear The electric ignition device comprises: an electric ignition device body, a plug pin, a main charge, an ignition charge and a bridge circuit; the lower section of the electric ignition device body is inserted into the mounting cavity from the upper end of the main housing, and a gas driving cavity is formed between the lower end of the electric ignition device body and the upper end of the cutter, and the main charge is mounted to the lower end of the electric ignition device body; the middle section of the electric ignition device body is fixed to the upper end of the main housing to close the mounting cavity from the upper end of the main housing; the upper section of the electric ignition device body is located outside the main housing, and the plug pin is located at the upper end of the electric ignition device body; the ignition charge and the bridge circuit are both located in the electric ignition device body, and the lower end of the plug pin is connected to one end of the bridge circuit, and the other end of the bridge circuit is in contact with the ignition charge, and the ignition charge can ignite the main charge.

[0010] The pyrotechnic driven unlocking device as described above, wherein preferably, the blade landing groove has a landing groove vertical direct contact surface and a landing groove inclined contact surface, the extension direction of the vertical direct contact surface of the landing groove is the same as the axial direction of the mounting cavity, the extension direction of the inclined contact surface of the landing groove is at a certain angle to the axial direction of the mounting cavity, and the intersection of the vertical direct contact surface of the landing groove and the inclined contact surface of the landing groove is located inside the anvil; the lower section of the cutter has a cutter vertical direct contact surface and a cutter inclined contact surface, the extension direction of the cutter vertical direct contact surface is the same as the axial direction of the mounting cavity, the extension direction of the cutter inclined contact surface is at a certain angle to the axial direction of the mounting cavity, and the intersection of the cutter vertical direct contact surface and the cutter inclined contact surface is located at the lower end of the cutter.

[0011] In the pyrotechnic driven unlocking device as described above, preferably, the lower end of the blade landing groove is also concave inward from the vertical contact surface to accommodate debris generated when cutting the target workpiece.

[0012] In the pyrotechnic driven unlocking device as described above, preferably, the anvil loading hole is a tapered hole, with its small end facing the blade landing groove and its large end facing the main housing.

[0013] In the pyrotechnic driven unlocking device as described above, preferably, the circumferential surface of the upper section of the cutter has an inwardly concave sealing assembly groove, and a cutter sealing ring is arranged in the sealing assembly groove.

[0014] In the pyrotechnic driven unlocking device as described above, preferably, the lower end of the electric ignition device body has an upwardly concave charging groove, and the main charge is loaded into the charging groove.

[0015] In the pyrotechnic driven unlocking device as described above, preferably, the bridge circuit adopts a single-shot double-bridge design.

[0016] In the pyrotechnic driven unlocking device as described above, preferably, the electric ignition device uses ceramic sintering to isolate the main charge from the bridge circuit and the pin.

[0017] A pyrotechnic drive unlocking system comprises: a target workpiece and any one of the above-mentioned pyrotechnic drive unlocking devices; wherein the target workpiece is inserted into the shell loading hole of the main shell and the anvil loading hole on the anvil, and the part of the target workpiece located in the blade landing groove is in a suspended state.

[0018] Compared with the above-mentioned background technology, the electric ignition device of the pyrotechnic driven unlocking device in the present application ignites the main charge after receiving the electrical signal. The main charge instantly generates high-temperature and high-pressure combustion gas, which drives the cutter to move at high speed and cut off the target part to be cut, thereby realizing the unlocking of products such as spacecraft.

[0019] Since the electric ignition device of the pyrotechnic driven unlocking device of the present application adopts a highly integrated design, the structural size is greatly reduced through the integration of the pyrotechnic part detonation and the charging structure, making the structure more compact and reducing the structural weight; the electric ignition device of the pyrotechnic driven unlocking device of the present application also adopts high-energy density explosives, which increases the output gas energy and further reduces the structural size and weight of the product; in addition, the electric ignition device of the pyrotechnic driven unlocking device of the present application adopts a double sealing design of gasket and ignition sealing ring to further improve the sealing reliability of the product.

[0020] The cutter of the pyrotechnic drive unlocking device of the present application is made of high-strength spring steel material with an HRC of more than 50, and adopts a straight-shaped cutter with a variable angle design at the blade to ensure that the cutter has sufficient strength and maintains good willfulness, thereby improving the reliability of the cutting performance; in addition, the cutter is radially sealed with an O-type high-temperature resistant rubber ring around the circumference to ensure a good seal between the cutter and the inner wall of the main shell and avoid participating in gas pollution of the environment.

[0021] The anvil of the pyrotechnic drive unlocking device of the present application adopts an integral structure, and the anvil is provided with an anvil loading hole. The anvil loading hole adopts a conical hole design, which can make the target cut workpiece a stress concentration point at the axial symmetry plane of the cavity. The stress concentration points of the cutter and the anvil are both located here, further improving the cutting performance, reliability and quality consistency of the target body. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a front view of the pyrotechnic drive unlocking device provided by the present application;

[0024] Figure 2 It is a left view of the pyrotechnic drive unlocking device provided by the present application;

[0025] Figure 3 is a cross-sectional view of the pyrotechnic drive unlocking device provided in the present application;

[0026] Figure 4 It is a partial enlarged view of the electric ignition device of the pyrotechnic drive unlocking device provided by the present application;

[0027] Figure 5 It is a partial enlarged view of the cutter, anvil and screw plug of the explosive driving unlocking device provided by the present application;

[0028] Figure 6 It is a front view of the cutter of the explosive driving unlocking device provided by the present application;

[0029] Figure 7 It is a left view of the cutter of the explosive driving unlocking device provided by the present application;

[0030] Figure 8 It is a front view of the knife anvil of the explosive driving unlocking device provided by the present application;

[0031] Fig. 9is a cross-sectional view of the knife anvil of the pyrotechnic drive unlocking device provided in the present application;

[0032] Among them, 100-pyrotechnic drive unlocking device, 110-electric ignition device, 111-electric ignition device body, 112-pin, 113-main charge, 120-main shell, 121-shell loading hole, 122-shear pin assembly hole, 123-gas drive chamber, 130-cutter, 131-seal assembly groove, 132-shear pin assembly groove, 140-shear pin, 150-anvil, 151-blade landing groove, 152-weight reduction chamber, 153-anvil loading hole, 160-screw plug, 161-tool matching groove, 170-cutter sealing ring, 180-gasket, 190-ignition sealing ring. DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. In addition, spatial relationship terms such as "upper", "lower", "left", "right", "front", "rear", etc. are used to facilitate description to explain the positional relationship between two components. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limitations on the present invention.

[0034] like Figure 1 to Figure 3 As shown, the present application provides an initiator driven unlocking device 100 , including: an electric ignition device 110 , a main housing 120 , a cutter 130 , a shear pin 140 , an anvil 150 and a screw plug 160 .

[0035] The main housing 120 has an installation cavity that passes through both ends, and the screw plug 160 is fixed to the lower end of the main housing 120 to close the installation cavity from the lower end of the main housing 120 .

[0036] Optionally, the inner wall of the installation cavity is provided with an internal thread near the lower end of the main housing 120, and the screw plug 160 has an external thread. The screw plug 160 is screwed into the installation cavity from the lower end of the main housing 120, and the screw plug 160 is fixedly connected to the lower end of the main housing 120 through the external thread of the screw plug 160 and the internal thread of the installation cavity, thereby closing the lower end of the main housing 120. Also optionally, as Figure 5 As shown, in order to facilitate screwing the screw plug 160 into the installation cavity, an inwardly concave tool matching groove 161 is provided at the lower end of the screw plug 160. During installation, the tool is inserted into and stuck in the tool matching groove 161, and the screw plug 160 is screwed into the installation cavity from the lower end of the main shell 120 by rotating the tool.

[0037] The anvil 150 is located in the installation cavity of the main housing 120, and the lower end of the anvil 150 contacts the upper end of the screw plug 160. Fig. 9As shown, the upper end of the anvil 150 has an inwardly concave blade seating groove 151 for cooperating with the lower section of the cutter 130 to achieve cutting of the target piece 200. After the cutter 150 completely cuts off the target piece 200, the cutter 130 seats in the blade seating groove 151, where "inside" refers to the interior of the anvil 150.

[0038] Optionally, the blade landing groove 151 has a landing groove vertical direct contact surface and a landing groove inclined contact surface, the extension direction of the landing groove vertical direct contact surface is the same as the axial direction of the installation cavity, the extension direction of the landing groove inclined contact surface is at a certain angle to the axial direction of the installation cavity, and the intersection of the landing groove vertical direct contact surface and the landing groove inclined contact surface is located inside the anvil 150, so that the anvil 150 presents an asymmetric design. Optionally, the landing groove vertical direct contact surface is located on the axis of the installation cavity, so that the position bearing the cutting force is located in the middle of the anvil 150, which is conducive to the bearing of the cutting force. Optionally, the blade landing groove 151 of the anvil 150 is in the shape of an inverted cone, that is, the landing groove vertical direct contact surface is in the shape of an inverted triangle, so that the blade landing groove 151 cooperates with the cutter 130 of the corresponding shape. In addition, the hardness of the anvil 150 should be higher than the hardness of the target cut piece 200 to prevent the target cut piece 200 from being embedded in the anvil 150 during the cutting process.

[0039] Optionally, the portion of the anvil 150 located on the vertical contact surface of the landing groove is higher than the portion of the anvil 150 located on the inclined contact surface of the landing groove, thereby facilitating the cutting of the target workpiece 200. Still optionally, the lower end of the blade landing groove 151 is also concave inward from the vertical contact surface, thereby accommodating the debris generated when the target workpiece 200 is cut. In order to reduce the weight of the anvil 150, as shown in FIG. Fig. 9 As shown, the lower end of the knife anvil 150 has an inwardly concave weight-reducing cavity 152 , and the weight-reducing cavity 152 is not connected to the knife edge seating groove 151 .

[0040] In addition, if Figure 5 As shown, a housing insertion hole 121 is provided on the side wall of the main housing 120 and penetrates in the radial direction. Figure 8 and Fig. 9 As shown, an anvil 150 is also provided with an anvil loading hole 153 which penetrates in the radial direction, and the anvil loading hole 153 passes through the blade seating groove 151, and the shell loading hole 121 is opposite to the anvil loading hole 153, that is, the shell loading hole 121 and the anvil loading hole 153 are on the same diameter, so that after the target piece 200 is loaded into the shell loading hole 121 and the anvil loading hole 153, the part of the target piece 200 located in the blade seating groove 151 is in a suspended state, so as to facilitate the cutting of the target piece 200.

[0041] Optionally, two shell insertion holes 121 are provided on the side wall of the main shell 120, and the two shell insertion holes 121 are located on the same diameter, so that the target cut piece 200 can pass through the main shell 120. Optionally, the lowest point of the anvil insertion hole 153 and the highest point of the portion of the anvil 150 located on the side of the inclined contact surface are in the same plane, so that a portion of the target cut piece 200 is placed on the portion of the anvil 150 located on the side of the inclined contact surface. Optionally, the anvil insertion hole 153 is a tapered hole, and its small end faces the blade landing groove 151, and its large end faces the main shell 120. By designing the anvil insertion hole 153 on the anvil 150 as a tapered hole, the target cut piece 200 can be made a stress concentration point at the axial symmetric plane of the cavity, and the stress concentration points of the cutter 130 and the anvil 7 are both located here, further improving the cutting performance, reliability and quality consistency of the target body.

[0042] The cutter 130 is located in the installation cavity of the main shell 120, and the cutter 130 is located above the anvil 150. The circumferential surface of the upper section of the cutter 130 contacts the inner wall of the installation cavity, and the lower section of the cutter 130 can extend into the blade seating groove 151 to cooperate with the anvil 150 to achieve cutting of the target workpiece 200.

[0043] Optionally, the lower section of the cutter 130 has a cutter vertical direct contact surface and a cutter inclined contact surface, the extension direction of the cutter vertical direct contact surface is the same as the axial direction of the installation cavity, the extension direction of the cutter inclined contact surface is at a certain angle to the axial direction of the installation cavity, and the intersection of the cutter vertical direct contact surface and the cutter inclined contact surface is located at the lower end of the cutter 130, so that the cutter 130 presents an asymmetric design, and the vertical direct contact surface of the cutter 130 cooperates with the vertical direct contact surface of the blade landing groove 151, so that the cutter 130 can move along the vertical direct contact surface in the blade landing groove 151 and avoid causing circumferential rotation. Optionally, the cutter vertical direct contact surface is located on the axis of the installation cavity, so that the position for cutting is located in the middle of the cutter 130, which is conducive to cutting. Alternatively, the shape of the lower section of the cutter 130 is an inverted pyramid, that is, the vertical contact surface of the cutter is an inverted triangle, so that the blade of the cutter 130 adopts a variable angle design, ensuring that the cutter 130 has sufficient strength and maintains good flexibility, thereby improving the reliability of the cutting performance. Still optionally, the cutter 130 can adopt a straight or annular cutter. Also optionally, the hardness of the cutter 130 usually needs to be higher than the hardness of the target cut piece 200 and the hardness of the anvil 150, preferably 20 (Rockwell hardness) or more. Usually, the target cut piece 200 (cutting steel rods or titanium alloy rods) is made of spring steel, and the hardness of the cutter 130 needs to reach HRC50-60.

[0044] Optional, such as Figure 6 and Figure 7As shown, the upper surface of the cutter 130 has an inwardly concave sealing assembly groove 131. Figure 5 As shown, a cutter sealing ring 170 is arranged in the sealing assembly groove 131, and the sealing of the upper and lower parts of the cutter 130 is realized by the cutter sealing ring 170, so as to avoid the gas from polluting the environment. Optionally, the sealing assembly groove 131 is a circular groove on the same plane on the circumference, and the cutter sealing ring 170 is an O-type high temperature resistant rubber ring radial seal, so as to more effectively ensure the sealing of the upper and lower parts of the cutter 130.

[0045] like Figure 5 As shown, the circumferential surface of the cutter 130 has an inwardly concave shear pin assembly groove 132, and the side wall of the main shell 120 has a shear pin assembly hole 122 that passes through the inside and outside. The shear pin 140 is inserted into the shear pin assembly hole 122, and its inner section is inserted into the shear pin assembly groove 132, so that when there is no need to shear the target cut piece 200, the position of the cutter 130 can be temporarily fixed by the shear pin 140.

[0046] Optionally, the diameter of the shear pin assembly groove 132 is smaller than the diameter of the shear pin assembly hole 122, the diameter of the inner section of the shear pin 140 is smaller than the diameter of the outer section of the shear pin 140, and the diameter of the outer section of the shear pin 140 is larger than the diameter of the shear pin assembly groove 132, so that the inner section of the shear pin 140 is inserted into the shear pin assembly groove 132, and the outer section of the shear pin 140 is inserted into the shear pin assembly hole 122.

[0047] The upper end surface of the cutter 130 receives the pressure from the high-temperature and high-pressure gas, works downward to shear the shear pin 140, and overcomes the friction between the cutter 130 and the main shell 120. The blade at the lower end of the cutter 130 quickly contacts the target piece 200 to overcome the shear force of the target piece 200 until the target piece 200 is cut.

[0048] Therefore, the main forces acting on the cutter 130 are the force F1 required by the target cut piece 200, the friction force F2 during the movement of the cutter 130, and the shear force F3 acting on the shear pin 140, that is, the total driving force is:

[0049] F=F1+F2+F3

[0050] The pressure P0 in the gas driven chamber after the main charge 113 deflagrates is estimated based on the total driving force F. When calculating the pressure P0, the explosion heat energy of the main charge 113 needs to be considered. In the closed gas driven chamber, part of the energy generated by the deflagration of the main charge 113 is consumed on the pipe wall, and part is lost in the residue, while the force that pushes the cutter 130 to do work accounts for about 30-40% of the energy released by the main charge 113.

[0051] like Figure 3 and Figure 4 As shown, the electric ignition device 110 includes: an electric ignition device body 111, a pin 112, a main charge 113, an ignition charge (not shown in the figure) and a bridge circuit (not shown in the figure); the lower section of the electric ignition device body 111 is inserted into the installation cavity from the upper end of the main shell 120, and a gas driving cavity 123 is formed between the lower end of the electric ignition device body 111 and the upper end of the cutter 130, and the main charge 113 is installed at the lower end of the electric ignition device body 111; The middle section of the ignition device body 111 is fixed to the upper end of the main shell 120 to close the installation cavity from the upper end of the main shell 120; the upper section of the electric ignition device body 111 is located outside the main shell 120, and the pin 112 is located at the upper end of the electric ignition device body 111; the ignition charge and the bridge circuit are both located in the electric ignition device body 111, and the lower end of the pin 112 is connected to one end of the bridge circuit, and the other end of the bridge circuit is in contact with the ignition charge, and the ignition charge can ignite the main charge 113.

[0052] The pin 112 is used to connect an external matching electrical connection signal line to receive an electrical signal, and the electrical signal is converted into heat energy through the pin 112 and the bridge circuit, thereby igniting the ignition charge, and then igniting the main charge 113. The main charge 113 burns in the closed gas drive chamber 123 to produce high-temperature and high-pressure gas. The high-temperature and high-pressure gas quickly fills the gas drive chamber 123 to drive the cutter 130 to move downward at a high speed to quickly cut off the target workpiece 200, until the lower section of the cutter 130 completely falls into the blade landing groove 151 of the anvil 150, and stops moving to complete the work.

[0053] Optionally, the ignition charge contacts the main charge 113 to ignite the main charge 113. Also optionally, the upper end of the electric ignition device body 111 has a downwardly concave pin groove, the pin 112 extends vertically, and the lower end of the pin 112 is fixed to the bottom of the pin groove. Optionally, the lower end of the electric ignition device body 111 has an upwardly concave charge groove, and the main charge 113 is loaded into the charge groove. Still optionally, the bridge circuit adopts a single-shot double-bridge design to ensure safety while compressing the spatial volume of the electric ignition device 110, reducing the structural size of the electric ignition device 110, making its structure more compact and reducing the structural weight.

[0054] The main charge 113 may be made of explosives such as RDX. As a type of explosive, RDX has higher explosive power and higher gas generation rate than previous ignition powders such as potassium borate nitrate, black powder, and perchloric acid. At the same time, compared with explosives such as Taian, the two have similar explosive power, but the melting point of Taian is 142°C, and Taian often begins to decompose at a high temperature of 120°C, resulting in insufficient output energy, affecting the working performance of the pyrotechnic drive unlocking device 100. The melting point of RDX is 203°C, which can effectively improve the adaptability of the product in high temperature environments.

[0055] Calculation of the amount of main charge 113:

[0056] The high-temperature and high-pressure gas generated after the main charge 113 is ignited acts on the upper end surface of the cutter 130, pushing the cutter 130 to move downward quickly to cut the target cut piece 200. The pressure on the upper end surface of the cutter 130 should be greater than the friction between the cutter 130 and the main housing 120 when it moves downward and the cutting force required to cut the target cut piece 200. The pressure generated after the main charge 113 is ignited can be calculated by the pressure, and then the amount of the main charge 113 can be determined.

[0057]

[0058] Among them: α0 is the residual gas volume of the main charge; ω0 is the amount of the main charge; V0 is the initial volume of the gas-driven chamber; f0 is the gunpowder power of the main charge, which is related to the type of the main charge; η is the energy utilization rate of the main charge, which can be taken as 0.8~0.9; P0 is the pressure in the gas-driven chamber after the main charge deflagrates.

[0059] Optionally, the middle section of the electric ignition device body 111 is fixedly connected to the main housing 120 by threads. Specifically, the middle section of the electric ignition device body 111 protrudes radially outward with a fixing step, and the fixing step is fixed to the upper end of the main housing 120 by bolts. Figure 4 As shown, a gasket 180 is provided between the lower surface of the fixed step and the upper end surface of the main housing 120 to play a sealing role. Optionally, the gasket 180 is a copper gasket. Still optionally, the circumferential surface of the lower section of the electric ignition device body 111 has an inwardly concave ignition seal assembly groove, and an ignition seal ring 190 is provided in the ignition seal assembly groove to play a sealing role. The double sealing design of the gasket 180 and the ignition seal ring 190 further improves the sealing reliability of the product. Optionally, the ignition seal ring 190 is not a silicone rubber ring.

[0060] On the basis of the above, the electric ignition device 110 adopts a highly integrated design, and through the integration of the pyrotechnic part detonation and the charge structure, the structural size of the electric ignition device 110 is greatly reduced, making the structure more compact and reducing the structural weight. As an example, the electric ignition device 110 can be an electric igniter or an electric detonator.

[0061] Since the present application aims to realize the miniaturization and lightweight of the pyrotechnic driven unlocking device 100, the driving gas source of the pyrotechnic driven unlocking device 100 must have high energy. Therefore, the pressure of the gas in the gas driving chamber 123 under the maximum amount of charge often needs to reach above 50MPa or even higher. Then, the electric ignition device 110 needs to adopt ultra-high energy density charge and also needs to have an ultra-high pressure sealing design. Typically, when the electric ignition device 110 is under a pressure exceeding 50 MPa, a partition or an air-sealing mechanism is required to isolate the main charge 113 of the electric ignition device 110 from the bridge circuit and the pin 112 of the electric ignition device 110. However, the addition of a partition and an air-sealing mechanism requires the entire structure to occupy more space, causing the axial dimension of the electric ignition device 110 to be more than doubled compared to the existing integrated design structure. Therefore, the electric ignition device 110 in the present application uses ceramic sintering to directly replace the previous glass sintering for isolation between the main charge 113 and the bridge circuit and the pin 112 of the electric ignition device 110, which can achieve a pressure resistance exceeding 100 MPa and a miniaturized design.

[0062] The present application also provides a pyrotechnic drive unlocking system, comprising: the above-mentioned pyrotechnic drive unlocking device 100 and a target piece to be cut 200; wherein the target piece to be cut 200 is inserted into the shell loading hole 121 of the main shell 120 and the anvil loading hole 153 on the anvil 150, and the part of the target piece to be cut 200 located in the blade landing groove 151 is in a suspended state, so that the target piece to be cut 200 is cut by the cutter 130.

[0063] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0064] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A device for unlocking an explosive device, characterized in that: include: Electric ignition device, main housing, cutter, shear pin, anvil and screw plug; The main housing has an installation cavity that passes through both ends, and a screw plug is fixed to the lower end of the main housing to close the installation cavity from the lower end of the main housing. The knife anvil is located in the installation cavity of the main housing, and the lower end of the knife anvil contacts the upper end of the screw plug, and the upper end of the knife anvil has an inwardly concave knife blade landing groove; A shell loading hole is provided on the side wall of the main shell and penetrates in the radial direction. A knife anvil loading hole is provided on the knife anvil and penetrates in the radial direction. The knife anvil loading hole passes through the knife blade placement groove. The shell loading hole is opposite to the knife anvil loading hole. The cutter is located in the mounting cavity of the main housing, and the cutter is located above the anvil. The circumference of the upper section of the cutter contacts the inner wall of the mounting cavity, and the lower section of the cutter can be extended into the blade landing groove to cooperate with the anvil. The circumference of the cutter has an inwardly concave shear pin assembly groove, and the side wall of the main housing has a shear pin assembly hole that passes through the inside and outside. The shear pin penetrates the shear pin assembly hole, and its inner section is inserted into the shear pin assembly groove. The electric ignition device includes: an electric ignition device body, a pin, a main charge, an ignition charge and a bridge circuit; the lower section of the electric ignition device body is inserted into the installation cavity from the upper end of the main shell, and a gas drive cavity is formed between the lower end of the electric ignition device body and the upper end of the cutter, and the main charge is installed to the lower end of the electric ignition device body; the middle section of the electric ignition device body is fixed to the upper end of the main shell to close the installation cavity from the upper end of the main shell; the upper section of the electric ignition device body is located outside the main shell, and the pin is located at the upper end of the electric ignition device body; the ignition charge and the bridge circuit are both located in the electric ignition device body, and the lower end of the pin is connected to one end of the bridge circuit, and the other end of the bridge circuit is in contact with the ignition charge, and the ignition charge can ignite the main charge.

2. The initiator drive unlocking device according to claim 1, characterized in that: The blade landing groove has a landing groove vertical direct contact surface and a landing groove inclined contact surface, the extension direction of the landing groove vertical direct contact surface is the same as the axial direction of the installation cavity, the extension direction of the landing groove inclined contact surface is at a certain angle to the axial direction of the installation cavity, and the intersection of the landing groove vertical direct contact surface and the landing groove inclined contact surface is located inside the knife anvil; The lower section of the cutter has a vertical direct contact surface and an inclined contact surface. The extension direction of the vertical direct contact surface of the cutter is the same as the axial direction of the mounting cavity. The extension direction of the inclined contact surface of the cutter is at a certain angle to the axial direction of the mounting cavity. The intersection of the vertical direct contact surface of the cutter and the inclined contact surface of the cutter is located at the lower end of the cutter.

3. The initiator drive unlocking device according to claim 1 or 2, characterized in that: The lower end of the blade placement groove is also concave inward from the vertical contact surface to accommodate debris generated when cutting the target workpiece.

4. The initiator drive unlocking device according to claim 1 or 2, characterized in that: The knife anvil insertion hole is a tapered hole, with its small end facing the knife blade landing groove and its large end facing the main housing.

5. The initiator drive unlocking device according to claim 1 or 2, characterized in that: The circumferential surface of the upper section of the cutter is provided with an inwardly concave sealing assembly groove, in which a cutter sealing ring is arranged.

6. The initiator drive unlocking device according to claim 1 or 2, characterized in that: The lower end of the electric ignition device body is provided with a charging groove which is concave upwards, and the main charging is loaded into the charging groove.

7. The initiator drive unlocking device according to claim 1 or 2, characterized in that: The bridge adopts a single-engine double-bridge design.

8. The initiator drive unlocking device according to claim 1 or 2, characterized in that: The electric ignition device uses ceramic sintering to isolate the main charge from the bridge circuit and pins.

9. A pyrotechnic drive unlocking system, characterized in that: include: A target cut piece and an explosive driving unlocking device as claimed in any one of claims 1 to 8; The target piece to be cut is inserted into the housing insertion hole of the main housing and the anvil insertion hole on the anvil, and the portion of the target piece to be cut located in the blade landing groove is in a suspended state.

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