FR2998361A1 - Pyrotechnic connection device for connection of circuits of pyrotechnic chain for military aircraft, has connecting elements brought into contact with each other such that internal channels face each other with interposition of distal wall - Google Patents

Abstract

The device has a connecting element (60) defining an internal channel (66) for circulating a pyrotechnic wave, where the connecting element includes a distal wall (70) for sealing the internal channel, and a shaped propellant charge (72) placed in the internal channel. Another connecting element (62) defines another internal channel (96) for circulating the pyrotechnic wave, where the latter connecting element is intended to be brought into contact with the former connecting element to place the former internal channel facing the latter internal channel with interposition of the distal wall. Independent claims are also included for the following: (1) a pyrotechnic chain for a platform (2) a platform (3) a method for transmission of a pyrotechnic wave in a pyrotechnic chain.

Description

The present invention relates to a pyrotechnic connection device between two circuits of a pyrotechnic chain, comprising: a first connection element defining a first internal channel of a pyrotechnic chain, comprising: a first connection element defining a first internal channel of a pyrotechnic chain; circulating a pyrotechnic wave, the first connecting element comprising a frangible distal wall closing the first internal channel, and a first explosive charge disposed in the first internal channel in the vicinity of the distal wall; a second connection element defining a second internal channel for circulating the pyrotechnic wave, the second connection element being able to be brought into contact with the first connection element in order to place the first internal channel opposite the second internal channel, with interposition of at least the distal wall. Such a device is intended for example for an aircraft, to be placed at the interface between two elements of the aircraft movable relative to each other. A first circuit of the pyrotechnic chain is then mounted on the first aircraft element, while a second circuit of the pyrotechnic chain is mounted on the second aircraft element. In particular, the device is suitable for use on a rescue system comprising an aircraft pyrotechnic circuit, a pyrotechnic glass circuit, and a pyrotechnic seat. In a known manner, a rescue system on a military aircraft comprises an ejection seat whose ejection out of the aircraft can be activated by detonation of an explosive charge. However, during the ejection of the seat, it is necessary to move or mechanically weaken the canopy located above the seat, to prevent the occupant of the seat is injured during ejection. To do this, it is known to make a pyrotechnic connection between the pyrotechnic circuit generating the ejection of the seat and the pyrotechnic circuit causing the displacement or the weakening of the canopy to ensure the simultaneity of the rupture of the canopy with the ejection of the seat. However, in normal use, the canopy is movable relative to the fuselage of the aircraft and therefore relative to the seat, to allow the occupant of the seat to access the cockpit. It is therefore necessary that the pyrotechnic link between the various circuits of the pyrotechnic chain allows such a displacement. For this purpose, flexible pyrotechnic transmission lines called cords can be used. However, these cords have many disadvantages. When the canopy is to be removed, it is necessary to dismantle all pyrotechnic lines.

Moreover, such cords must be robust to aggression, and must withstand fatigue, which increases their cost. In addition, they are bulky. To overcome this problem, the application FR 2 559 451 of the Applicant describes a connection device of the aforementioned type. In this device, a distal wall of a first connecting element, integral with the structure of the aircraft, is applied to a proximal wall of a second connecting element integral with the canopy, when the canopy is closed. The first connecting element and the second connecting element being separated from each other, it is possible to open the canopy, without having to perform particular mechanical operations between the first connection element and the second element of connection. connection. When a pyrotechnic wave reaches the first connection element, it pierces the distal wall, then the proximal wall, and passes into the second connection element. The device of the aforementioned type is particularly simple to use, and requires reduced maintenance.

An object of the invention is to further improve this device, by providing a pyrotechnic connection device particularly easy to use, which allows an even more efficient transmission of a pyrotechnic wave between the two connection elements of the device. For this purpose, the subject of the invention is a device of the aforementioned type, characterized in that the first explosive charge is a hollow charge. The device according to the invention may comprise one or more of the following characteristics, taken in isolation or in any technically possible combination: the first explosive charge comprises a block of explosive material delimiting an internal cavity; the internal cavity of the first explosive charge opens opposite the distal wall; the internal cavity has an increasing cross section by moving towards the distal wall, for example a hemispherical, pseudo-hemispherical or conical shape. the first explosive charge comprises a distal confinement wall of the block of explosive material interposed between the block of explosive material and the internal cavity; the second connection element comprises a frangible proximal wall closing the second internal channel, the proximal wall being applied to the distal wall when the first connection element is placed in contact with the second connection element; the second connection element comprises a second explosive charge placed in the second internal channel facing the first explosive charge; the second explosive charge is a hollow charge; the first explosive charge and the second explosive charge each comprise a block of explosive material delimiting an internal cavity, the internal cavity of the first explosive charge opening facing the internal cavity of the second explosive charge; the first connection element and the second connection element are separable relative to each other between a position in contact with each other and a spacing position spaced apart from each other; the other in which they are totally separated; it comprises a mechanism for holding the first connection element and the second connection element in their position in contact with each other.

The invention also relates to a pyrotechnic chain for a platform, characterized in that it comprises: - at least one generation assembly of a pyrotechnic wave; at least one set of reception of the pyrotechnic wave; at least one device as defined above, and for the or each device: an upstream section connected to the generation assembly; a downstream section intended to be connected to the reception assembly; the first connection element being connected to the upstream section, the second connection element being connected to the downstream section. The invention also relates to a platform, characterized in that it comprises: - a basic structure; at least one separable component relative to the basic structure, such as an aircraft ejection seat or an aircraft canopy; a pyrotechnic chain as defined above, the upstream section being carried by one of the component and the base structure, the downstream section being carried by the other of the component and the base structure.

The subject of the invention is also a method for transmitting a pyrotechnic wave in a pyrotechnic chain, comprising the following steps: providing a device as defined above; supplying a pyrotechnic wave in the first internal channel of the first connection element; activation of the first explosive charge formed of a hollow charge by the pyrotechnic wave; - Drilling at least the distal wall to transmit a pyrotechnic wave in the second internal channel of the second connecting element.

The method according to the invention can comprise one or more of the following characteristics, taken separately or in any technically possible combination: the second connection element comprises a second explosive charge, formed by a hollow charge, the second charge; explosive being disposed in the second internal channel, facing the first explosive charge, the method comprising, after the step of drilling the distal wall, the activation of the second explosive charge. The invention will be better understood on reading the description which follows, given solely by way of example, and with reference to the appended drawings, in which: FIG. 1 is a simplified schematic view of a first channel; pyrotechnic device according to the invention, arranged in a platform, in a first configuration of use; - Figure 2 is a partial sectional view of a connection device according to the invention present in the first pyrotechnic chain of Figure 1 in the disconnected state; - Figure 3 is a partial sectional view of a connection device according to the invention present in the first pyrotechnic chain of Figure 1 in the connected state; - Figure 4 is a view of a detail marked IV in Figure 2, illustrating the connection device according to the invention; - Figure 5 schematically illustrates the activation of a hollow charge of the connection device according to the invention by a pyrotechnic wave; - Figure 6 schematically illustrates the transmission of the wave through a wall of the connection device of Figure 2; - Figure 7 is a view similar to Figure 1 in a second configuration of use.

A first platform 10, equipped with a pyrotechnic chain 12 according to the invention is illustrated in Figures 1 to 7. The platform 10 is for example a flying machine, such as an aircraft, including a military aircraft. Alternatively, the platform 10 is a spacecraft, such as a launcher, a land vehicle or a naval craft. The platform 10 comprises a base structure 14 and at least one component 16, 18, 20 movable with respect to the base structure 14, between a configuration mounted on the base structure 14 and an unobstructed configuration of the base structure 14. In the particular example shown in Figure 1, the platform 10 is an aircraft. The basic structure 14 is for example the fuselage of the aircraft. Each component 16, 18 is here formed by an ejectable seat, able to extract itself autonomously out of the base structure 14 through an opening. The component 20 is formed by a canopy, able to close the opening upwards above each ejection seat.

The pyrotechnic chain 12 comprises, for each component 16, 18, a first pyrotechnic circuit 22 upstream, carried by the component 16, 18. It comprises, for the component 20, a second downstream pyrotechnic circuit 24 carried by the second component 20. The chain 12 also comprises an intermediate pyrotechnic circuit 26 carried by the base structure 14 for connecting each first pyrotechnic circuit 22 to the second pyrotechnic circuit 24. The pyrotechnic chain 12 furthermore comprises, at each interface between each first pyrotechnic circuit 22 and the pyrotechnic circuit intermediate 26, and at the interface between the intermediate pyrotechnic circuit 26 and the second pyrotechnic circuit 24, a pyrotechnic connection device 30 according to the invention.

In this example, each first pyrotechnic circuit 22 comprises an assembly 34 for generating a pyrotechnic wave, a control member 36 capable of activating the generation assembly 34, and advantageously, an assembly 38 for displacing the component 16 to the The first pyrotechnic circuit 22 also comprises, for each component 16, 18, a first section 40 for guiding the pyrotechnic wave generated by the assembly 34, connected to the generation assembly 34. In the case where the component 16, 18 is an ejection seat, the control member 36 is for example a movable handle mounted on the ejection seat. The assembly 34 for generating a pyrotechnic wave is adapted to be activated by an actuation of the control member 36 to generate a pyrotechnic wave.

In this example, the generation assembly 34 furthermore forms a reception assembly of a pyrotechnic wave emitted by another component 16, 18, to activate the displacement assembly 38. The displacement assembly 38 is connected to the generation assembly 34 to cause the displacement of the component 16, 18, with respect to the structure 14, after receiving the pyrotechnic wave. The second pyrotechnic circuit 24 comprises an assembly 42 for receiving a pyrotechnic wave generated by one of the components 16, 18, an assembly 44 for displacing and / or breaking the component 20, and a second section 46 for guiding the pyrotechnic wave towards the displacement assembly 44. Upon reception of a pyrotechnic wave transmitted through the guide section 46, the reception assembly 42 is able to activate the assembly 44 to cause displacement and / or rupture of the component 20. In the case where the component 20 is a canopy, the assembly 44 is for example a chain of explosives eject clean the canopy, or break it to allow the passage of an ejection seat. The intermediate pyrotechnic circuit 26 is permanently carried by the structure 14. It comprises, for each component 16, 18, a first intermediate section 50 connected to a respective connection device 30, and a second intermediate section 52 connecting each first intermediate section 50 to the connection device 30 associated with the component 20. According to the invention, and as illustrated by FIGS. 2, 3 and 4, each connection device 30 comprises a first connection element 60 carried by a component 16, 18, 20, and a second connection element 62 carried by the structure 14.

The first connecting element 60 and the second connecting element 62 are detachable, for example by being reversibly movable relative to one another, between a contact position in which they are applied to one another on the another (FIG. 3), and a spacing position, in which they are situated apart from each other (FIG. 2), for example during displacement of a component 16, 18, 20 relative to the structure 14. In the example shown in FIGS. 2 and 3, the connection device 30 comprises a mechanism 63 for holding the first connection element 60 in the position of contact applied to the second connection element 62. As illustrated by FIGS. 2, 3 and 4, the first connection element 60 is connected to a section 40, 46 carried by one of the components 16, 18, 20.

It comprises a first guide duct 64 defining a first channel 66 for circulating a pyrotechnic wave and a first set 68 for closing the first channel 66 comprising a distal wall 70. According to the invention, the first connection element 60 comprises in addition, a first explosive charge 72 formed of a hollow charge capable of piercing the distal wall 70 to transmit a pyrotechnic wave through this wall 70. The first guide duct 64 is connected to the section 40, 46, for example by a The first channel 66 opens into the section 40, 46. In addition to the distal wall 70, the closure assembly 68 advantageously comprises a liner 76 for mounting on the first guide duct 64, adapted to maintain in a sealed manner the distal wall 70 at the free end of the first guide duct 64. The distal wall 70 sealingly isolates the explosive charge and protects it. The distal wall 70 extends transversely with respect to a local axis A-A 'of the first channel 66.

It has a thickness, taken along the local axis A-A ', for example between 0.2 millimeters and 2 millimeters. It defines a transverse external surface 76 on which the second connection element 62 is applied in the contact position. With reference to FIG. 4, the first explosive charge 72 is disposed at the end of the first channel 66, opposite and away from the distal wall 70. The first explosive charge 72 comprises a block 80 of explosive material defining a Internal cavity 82. The load 72 thus has a recessed portion, this load is a so-called hollow charge. In the example of FIG. 4, the first explosive charge 72 further comprises a distal confinement wall 84 interposed between the block and 80 and the cavity 82. The block 80 of explosive material comprises, for example, pentrite or any other secondary explosive. (eg hexogenic explosive or hexanitro stilbene). The block 80 is fixed in the channel 66. It blocks the channel 66 distally. It thus has at least one cross-section of shape complementary to the external cross-section of the channel 66. In the example represented in FIG. 4, the block 80 has a central zone 86 of ignition, directed opposite the cavity 82 and corresponding to the point of initiation of the hollow charge 72 from the pyrotechnic wave from the channel 66. The volume of the block 80 is greater or equal to the volume of the cavity 82.

The cavity 82 opens out distally opposite the distal wall 70. It has an increasing cross section by moving axially towards the wall 70.

Advantageously, the cavity 82 is of hemispherical, pseudo-hemispherical or conical shape. In the case of a partial hemisphere cavity, the distance separating the wall 70 from the bottom of the cavity 82 must be greater than the radius of this hemisphere in order to optimize the effect of the hollow charge 72. The partition 84 is applied on the block 80 at the periphery of the cavity 82. It is for example made from a sheet of metallic material. It has a concave shape emerging opposite the distal wall 70. Its thickness is substantially the same as that of the wall 70.

As will be seen below, and as illustrated by FIGS. 5 and 6, the first explosive charge 72 is able to activate when a pyrotechnic wave reaches its proximal edge through the channel 66. Once activated, the hollow charge 72 decomposes and generates a fluid flow 90 which converges in the form of a stinger towards the distal wall 70 to pierce this wall 70.

Referring to Figures 2, 3 and 4, the second connecting element 62 is connected to a section 50, 52, carried by the structure 14. It comprises a second guide duct 94 defining a second channel 96 for circulating a wave pyrotechnic and a second assembly 98 for closing the second channel 96 having a proximal wall 100.

Advantageously, the second connection element 62 further comprises a second explosive charge 102 formed of a hollow charge, capable of piercing the proximal wall 100 to transmit a pyrotechnic wave through this wall 100, in the case where a pyrotechnic wave transmitted to from a section 50, 52 reaches the second explosive charge 102.

The second guide duct 94 is connected to the section 50, 52, for example by a connector 104. The first channel 96 opens into the section 50, 52. In addition to the proximal wall 100, the closure assembly 98 advantageously comprises a folder 106 mounting on the first guide duct 64, adapted to maintain tightly the proximal wall 100 at the free end of the second guide duct 94. The proximal wall 100 extends transversely relative to a local axis AA 'of the second channel 96. It has a thickness, taken along the local axis A-A ', for example between 0.2 millimeters and 2 millimeters. It defines a transverse outer surface 106 on which the outer surface 76 of the first connecting element 60 in the contact position is applied.

With reference to FIG. 4, the second explosive charge 102 is disposed at the end of the second channel 96, opposite and away from the proximal wall 100. The second explosive charge 102 is arranged symmetrically with respect to the first explosive charge 72 in a transverse plane.

The second explosive charge 102 comprises a block 110 of explosive material defining an inner cavity 112 proximal. In the example of FIG. 4, the second explosive charge 102 further comprises a proximal containment partition 114 interposed between the block 110 and the cavity 112. The block 110 of explosive material comprises, for example, pentrite or any other secondary explosive ( for example a hexogenic explosive or a hexanitro stilbene). The block 110 is fixed in the channel 96. It closes the channel 96 proximally. It thus has at least one cross-section of complementary shape to the outer cross section of the channel 96. In the example shown in FIG. 4, the block 110 delimits a central priming zone 116, directed away from the cavity 112 and corresponding to the point of initiation of the hollow charge 102 from the pyrotechnic wave coming from the channel 96. The volume of the block 110 is greater than or equal to the volume of the cavity 112. The internal cavity 112 opens out distally in FIG. view of the proximal wall 100, advantageously facing the internal cavity 82 of the first explosive charge 72. It has an increasing cross section by moving axially towards the proximal wall 100. Advantageously, the cavity 112 is hemispherical, pseudo-hemispherical or conical. In the case of a partial hemisphere cavity, the distance separating the wall 100 from the bottom of the cavity 112 must be greater than the radius of this hemisphere in order to optimize the effect of the hollow charge 102. The partition 114 is applied on the block 110 at the periphery of the cavity 112. It is for example made from a sheet of metallic material. It has a concave shape emerging opposite the proximal wall 100. Its thickness is substantially the same as that of the wall 100. As will be seen below, the second explosive charge 102 is able to activate when a pyrotechnic wave reaches its distal edge through the second channel 96. Once activated, the hollow charge 102 decomposes and generates a fluid flow that converges in the form of a stinger towards the proximal wall 100 to pierce this wall 100.

Thus, the transfer of a pyrotechnic wave through the connection device 30 can advantageously be effected in both directions, from the first connection element 60 to the second connection element 62 from the first explosive charge 72, or conversely, from the second connection element 62 to the first connection element 60 from the second explosive charge 102. With reference to FIGS. 2 and 3, the holding mechanism 63 comprises a receiving jacket 200 of the first element 60 and a resilient biasing member 202 of the connecting element 60. The jacket 200 defines a passage 204 for receiving the first connecting element 60 in which this element 60 is slidably mounted between a visible rest configuration on FIG. 2, and a configuration of contact with the second connection element 62 in which it is elastically biased by the member 202 towards the a rest configuration. Thus, when the second connection element 62 comes into contact with the first connection element 60, it moves the first connection element 60 in the passage 204 causing the connection element 60 to be pressed onto the connection element 62 under the effect of a holding force generated by the biasing member 202. The operation of the first pyrotechnic chain 12 according to the invention will now be described. In the normal mode of use, each component 16, 18, 20 occupies its configuration mounted on the basic structure 14. At each connection device 30, the first connection element 60 is applied to the second connection element 62. Thus, the distal wall 70 and placed facing and in contact with the proximal wall 100. The pyrotechnic chain 12 is then continuous, and able to be activated. When each component 16, 18, 20 is to be displaced with respect to the structure 14 towards an unobstructed configuration of the base structure 14, the first connecting element 60 integral with the mobile component 16, 18, 20 is simply separated, reversibly , without torsion or extension, the second connecting element 62 carried by the base structure 14. This is particularly the case when the platform 10 is an aircraft, the component 20 being a canopy. The canopy can be opened in a simple and reversible way to allow each of the occupants of the cockpit to enter the basic structure 14, without risk of wear or damage to the connection device 30.

Similarly, when each component 16, 18 is formed by a seat, the seat can be disassembled in a simple and reversible manner, for example for maintenance, while ensuring the integrity of the connection device 30. normal mode of use, wherein each component 16, 18, 20 occupies its configuration mounted on the base structure 14, the pyrotechnic chain 12 can be activated. For this purpose, the control member 36 of one of the components 16, 18 is actuated, for example by an occupant of the platform 10. In the example shown in Figure 1, the control member 36 of the component 16 is operated.

The actuation of the control member 36 activates the generation assembly 34 to generate a pyrotechnic wave which is transmitted on the one hand, to the displacement assembly 38, and on the other hand, to the section 40. Then, the pyrotechnic wave present in the section 40 reaches the first connection element 60. The pyrotechnic wave is introduced into the first guide duct 64 and reaches the first explosive charge 72. The first explosive charge 72 is then activated, as illustrated by FIG. 5. Under the effect of the decomposition of the explosive material present in the block 80, a fluid flow 90 converging towards the distal wall 70 is generated in the cavity 82. This flow forms a directed and concentrated fluid jet to the distal wall 70.

The fluid jet then successively pierces the distal wall 70, then the proximal wall 100 and enters the second guide duct 94. The dart-shaped fluid flow generated during the activation of the hollow charge 72 thus offers a better reliability for the perforation of the walls 70 and 100. The hollow charge 72 also allows to perforate walls 70, 100 thicker than in the case of a full load. This makes it possible to provide protection walls 70, 100 that are more mechanically resistant, thus ensuring better protection of the hollow charges 72, 102. The jet of fluid then reaches the second explosive charge 102, when it is present, and activates this. charge for passing the pyrotechnic wave successively in the second guide duct 94, then in the first intermediate section 50. The pyrotechnic wave is then transmitted to the second intermediate portion 52 and reaches the connection device 30 present between the circuit intermediate pyrotechnic 26 and the second pyrotechnic circuit 24. The pyrotechnic wave reaches the second block of explosive material 102 and activates this block. This causes the creation of a jet of fluid which successively pierces the proximal wall 100 and the distal wall 70. The jet then passes into the first guide duct 64, and activates the first explosive charge 72. The pyrotechnic wave then reaches the receiving assembly 42 carried by the second component 20, which causes the activation of the rupture assembly and / or displacement 44 to release the second component 20. Simultaneously, a portion of the pyrotechnic wave present in the first intermediate section 50 associated with the component 16 is introduced into the first intermediate portion 50 associated with the component 18, passes the connection device 30, as described above for the component 20, and reaches the generation assembly 34 of the component 18. This causes activating the displacement assembly 38 of the component 18. Then, under the effect of each displacement assembly 38, each component 16, 18 moves towards its unobstructed configuration, in the space released by the component 20. Thus, when the component 20 is a canopy, the canopy is moved and / or broken under the effect of the assembly of rupture and / or displacement 44. Each component 16, 18 formed by an ejection seat is then extracted from the base structure 14 by means of a displacement assembly 38 (for example a pyrotechnic propulsion assembly for ejection of the seat). Each connection device 30 is thus adapted to operate in two directions, when it comprises an explosive charge 72, 102 in each connection element 60, 62. Each explosive charge 72, 102 is a hollow charge, its effectiveness of perforation of the walls. 70 and 100 is increased, which improves the reliability of the connection device 30. This ensures a safe use of the pyrotechnic chain 12. FIG. 7 illustrates an alternative mode of operation of the pyrotechnic chain 12. In this mode of operation, the control member 36 of the component 18 is activated first. The pyrotechnic wave generated by the generation assembly 24 of this component 18 is then transmitted to each of the components 16, 20 through the corresponding connection devices 30. In a variant (not shown) at least one connection device 30 is provided with a first explosive charge 72, without being provided with a second explosive charge 102. Such a device 30 is able to operate only in one direction, since the first connection element 60 to the second connection element 62. In another variant (not shown), the platform 10 comprises a single component 16 connected to a component 20. This is the case for example in a single-seat aircraft, the component 16 being formed by an ejection seat, and the component 20 being formed by the canopy.

In another variant, the platform 10 is a space launcher, such as a rocket. In yet another variant, the platform 10 is a land vehicle, or a naval craft. In the embodiment illustrated in FIGS. 1 to 7, the first connection element 60 and the second connection element 62 are detachable by being mounted reversibly movable with respect to one another, without the use of a device. fastener such as a screw or a rivet. Alternatively (not shown), the first connecting member 60 and the second connecting member 62 remain detachable, but are held fixed to one another by fasteners such as screws or rivets. It is the same for each component 16, 18, 20 with respect to the basic structure 14.

Claims (15)

CLAIMS1.- Device (30) for pyrotechnic connection between two circuits (22, 24; 26) of a pyrotechnic chain (12), comprising: - a first connection element (60) defining a first internal circulation channel (66) a pyrotechnic wave, the first connecting member (60) having a frangible distal wall (70) closing off the first internal channel (66), and a first explosive charge (72) disposed in the first inner channel (66) in the vicinity the distal wall (70); a second connection element (62) defining a second internal channel (96) for circulating the pyrotechnic wave, the second connection element (62) being able to be brought into contact with the first connection element (60) so as to place the first internal channel (66) facing the second internal channel (96), with interposition of at least the distal wall (70); characterized in that the first explosive charge (72) is a hollow charge. 2.- Device (30) according to claim 1, characterized in that the first explosive charge (72) comprises a block (80) of explosive material defining an internal cavity (82). 3.- Device (30) according to claim 2, characterized in that the internal cavity (82) of the first explosive charge (72) opens opposite the distal wall (70). 4.- Device (30) according to any one of claims 2 to 3, characterized in that the inner cavity (82) has an increasing cross section by moving towards the distal wall (70), for example a hemispherical shape, pseudo-hemispherical or conical. 5.- Device (30) according to any one of claims 2 to 4, characterized in that the first explosive charge (72) comprises a distal wall (84) for confining the block of explosive material (80) interposed between the block explosive material (80) and the internal cavity (82). 6.- Device (30) according to any one of the preceding claims, characterized in that the second connecting element (62) comprises a proximal wall (100) frangible closing the second inner channel (96), the proximal wall (100). ) being applied to the distal wall (70) when the first connection element (60) is placed in contact with the second connection element (62). 7.- Device (30) according to any one of the preceding claims, characterized in that the second connection element (62) comprises a second explosive charge (102), disposed in the second internal channel (96), facing the first explosive charge (72). 8.- Device (30) according to claim 7, characterized in that the second explosive charge (102) is a hollow charge. 9.- Device (30) according to claim 8, characterized in that the first explosive charge (72) and the second explosive charge (102) each comprise a block (80, 110) of explosive material defining an internal cavity (82, 112), the internal cavity (82) of the first explosive charge (72) opening opposite the internal cavity (112) of the second explosive charge (102). 10.- Device (30) according to any one of the preceding claims, characterized in that the first connecting element (60) and the second connecting element (62) are detachable relative to each other between a position in contact with each other, and a spacing position spaced apart from each other in which they are totally separated. 11. Device (30) according to claim 10, characterized in that it comprises a mechanism (31) for holding the first connecting element (60) and the second connecting element (62) in their position in contact with one another. the other. 12. Pyrotechnic chain (12) for a platform (10), characterized in that it comprises: - at least one assembly (34) for generating a pyrotechnic wave; at least one set (42; 34) for receiving the pyrotechnic wave; - At least one device (30) according to any one of the preceding claims, and for the or each device (30): - an upstream section (40) connected to the generation assembly (34); a downstream section (50) intended to be connected to the reception unit (42; 34); the first connection element (60) being connected to the upstream section (40), the second connection element (62) being connected to the downstream section (50). 13. Platform (10), characterized in that it comprises: - a base structure (14); at least one component (16, 18, 20) separable from the base structure (14), such as an aircraft ejection seat or an aircraft canopy; - a pyrotechnic chain (12) according to claim 12, the upstream section (40) being carried by one of the component (16, 18, 20) and the base structure (14), the downstream section (50) being carried by the other component (16, 18, 20) and the base structure (14). 14. A method for transmitting a pyrotechnic wave in a pyrotechnic chain (10), comprising the following steps: providing a device (30) according to any one of claims 1 to 11; supplying a pyrotechnic wave into the first internal channel (66) of the first connection element (60); activating the first explosive charge (72) formed of a hollow charge by the pyrotechnic wave; - Drilling at least the distal wall (70) to transmit a pyrotechnic wave in the second internal channel (96) of the second connecting member (62). 15. A method according to claim 14, characterized in that the second connecting element (62) comprises a second explosive charge (102), formed by a hollow charge, the second explosive charge (102) being disposed in the second internal channel (96), opposite the first explosive charge (72), the method comprising, after the step of drilling the distal wall (70), the activation of the second explosive charge (102).