Lock catch switch device, module and system thereof

Abstract

The utility model discloses a lock catch switch device, a module and a system thereof. The lock catch switch device comprises a lock catch seat, a lock catch pin and a switch, a first limiting structure and a second limiting structure are arranged on the lock catch seat; an accommodating space is formed in the lock catch seat; the lock catch pin is movably arranged in the containing space and can be fixedly matched with the first limiting structure or the second limiting structure. And a lock tongue is arranged on the lock catch pin. Two limiting structures are arranged on a lock catch seat, and lock catch pins are respectively matched with the two limiting structures, so that mechanical linkage of a spring bolt state and a switch elastic arm state on the lock catch pins is formed: when the lock catch pins are matched with the first limiting structures, the spring bolts are accommodated, and the switch is switched on, and a module is ensured to be pluggable and power-free; and when the lock catch pin is matched with the second limiting structure, the spring bolt extends out and the switch is switched off to ensure that the module is locked and electrified, so that the mandatory protection that the module can only be electrified after being completely inserted and can only be pulled out after being powered off is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of inverter modules, and in particular to a lock switch device, a module and a system thereof. Background Art

[0002] In high-power inverter module systems, if power is applied before the module socket and the frame pins are fully engaged when the module is inserted into the system frame, arcing may occur at the plug-in point, damaging the module socket and posing a safety hazard. During module maintenance, if the module is directly removed while energized, the high current will be instantly disconnected, causing arcing and potentially burning the module. Because such systems typically require continuous operation, complete power removal is not possible. Therefore, a mechanism is required to ensure that the module is powered only after it is fully mated with the frame and that the module is fully powered off before being removed during maintenance. Utility Model Content

[0003] The main purpose of the present invention is to provide a lock switch device, module and system thereof to solve the above technical problems.

[0004] The purpose of the utility model can be achieved by adopting the following technical solutions:

[0005] A latch switch device, suitable for installation in a module, comprising:

[0006] A lock seat, a lock pin and a switch; the lock seat is provided with a first limiting structure and a second limiting structure; and an accommodating space is provided in the lock seat;

[0007] The locking pin is movably arranged in the accommodating space and can form a fixed fit with the first limiting structure or the second limiting structure;

[0008] The lock pin is provided with a lock tongue, and the switch includes a switch elastic arm cooperating with the lock pin;

[0009] When the locking pin is fixedly engaged with the first limiting structure, the locking pin presses the switch elastic arm to turn on the switch, and the lock tongue is received in the accommodating space;

[0010] When the locking pin is fixedly engaged with the second limiting structure, the locking pin releases the switch elastic arm to disconnect the switch, and the locking tongue extends from the accommodating space. The locking tongue is used to cooperate with the locking structure in the installation environment of the module to lock the position of the module.

[0011] Wherein, the lock pin is provided with a boss portion opposite to the lock tongue, and the boss portion is used to press the switch elastic arm.

[0012] The first limiting structure and the second limiting structure are limiting holes respectively, the locking pin is provided with a locking spring arm, and the locking spring arm is provided with a protrusion for embedding the first limiting structure or the second limiting structure.

[0013] Wherein, the lock seat includes a lock body and a lock cover, and the lock cover is connected to the lock body to form the accommodating space.

[0014] The accommodating space is a channel with openings at opposite ends, and the first limiting structure and the second limiting structure are distributed along the length direction of the channel.

[0015] A guide groove is formed on the inner wall of the lock body and extends outwardly therefrom, and a handle passing through the guide groove is fixed on the lock pin.

[0016] Wherein, the lock switch device further includes a printed circuit board and a socket, and the switch and the socket are arranged on opposite sides of the printed circuit board.

[0017] A module comprises a panel, wherein the lock switch device as described above is arranged inside the panel, and the panel is provided with a first through hole for the lock tongue to extend out and a second through hole for the handle of the lock switch device to pass through.

[0018] An inverter module system comprises: a system plug-in frame, wherein the module as described above is arranged in the system plug-in frame, and a locking structure cooperating with the lock tongue is provided on the system plug-in frame.

[0019] Wherein, the locking structure is a bayonet corresponding to the lock tongue.

[0020] Beneficial technical effects of the utility model:

[0021] By arranging two limiting structures on the lock seat and making the lock pin cooperate with them respectively, a mechanical linkage is formed between the lock tongue state on the lock pin and the switch spring arm state: when the lock pin cooperates with the first limiting structure, the lock tongue is retracted and the switch is turned on, ensuring that the module is pluggable and without power; when the lock pin cooperates with the second limiting structure, the lock tongue is extended and the switch is disconnected, ensuring that the module is locked and powered, thereby realizing the mandatory protection that the module can only be powered on after being fully inserted and must be powered off before it can be pulled out. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the lock components of the lock switch device according to an embodiment of the present utility model;

[0023] Figure 2 This is a schematic diagram of the lock assembly of the lock switch device according to an embodiment of the present invention;

[0024] Figure 3 This is a front view of a lock cover of a lock switch device according to an embodiment of the present utility model;

[0025] Figure 4 This is a side view of a lock seat of a lock switch device according to an embodiment of the present utility model;

[0026] Figure 5 This is a front view of a lock pin of a lock switch device according to an embodiment of the present utility model;

[0027] Figure 6 This is a schematic diagram of the lock operation of the lock switch device according to an embodiment of the present utility model;

[0028] Figure 7 This is a cross-sectional diagram of the lock pin of the lock switch device according to the embodiment of the present utility model when it is in the upward position;

[0029] Figure 8 This is a cross-sectional view of the lock pin of the lock switch device according to the embodiment of the present invention when it is in the downward position;

[0030] Figure 9 This is a schematic diagram of a switch of the lock switch device according to an embodiment of the present utility model;

[0031] Figure 10 This is a schematic diagram of the switch and lock assembly of the lock switch device according to an embodiment of the present utility model;

[0032] Figure 11 This is a schematic diagram of the switch and lock assembly of the lock switch device according to an embodiment of the present utility model;

[0033] Figure 12 This is a schematic diagram of the switch and lock of the lock switch device according to an embodiment of the present invention assembled in a panel;

[0034] Figure 13 This is a schematic diagram of the switch and lock of the lock switch device according to an embodiment of the present invention assembled in a panel;

[0035] Figure 14 This is a schematic diagram of a module of an embodiment of the present utility model;

[0036] Figure 15 A schematic diagram of a system plug-in frame according to an embodiment of the present utility model;

[0037] Figure 16 for Figure 15 A magnified schematic diagram;

[0038] Figure 17 This is a schematic diagram of a module insertion system frame according to an embodiment of the present utility model;

[0039] Figure 18 This is a schematic diagram of an inverter module system according to an embodiment of the present utility model;

[0040] Figure 19 Schematic diagram of an inverter module system according to an embodiment of the present invention.

[0041] Description of reference numerals:

[0042] In the figure: 10-lock body, 11-accommodating space, 111-first limiting structure, 112-second limiting structure, 12-guide groove, 20-lock pin, 21-lock spring arm, 211-protruding portion, 22-boss portion, 23-lock tongue, 24-handle, 30-lock cover, 40-switch, 41-switch spring arm, 50-printed circuit board, 60-socket, 70-panel, 71-first through hole, 72-second through hole, 80-system frame, 81-limiting plate, 811-bayonet. DETAILED DESCRIPTION

[0043] In order to make the technical solution of the present invention more clear and specific to those skilled in the art, the present invention is described in further detail below with reference to embodiments and drawings, but the implementation manner of the present invention is not limited thereto.

[0044] like Figures 1-19 As shown, the lock switch device provided in this embodiment includes a lock seat, a lock pin 20 and a switch 40.

[0045] The latch seat has an accommodating space 11 within which a latch pin 20 is movably mounted. The latch seat is also provided with a first retaining structure 111 and a second retaining structure 112, spaced apart from each other. The latch pin 20 can securely engage with either the first retaining structure 111 or the second retaining structure 112 to secure the latch pin 20 in different positions.

[0046] Fixed fit means that the locking pin 20 can be fixedly connected to the first limiting structure 111 after being moved in the direction of the first limiting structure 111, or can be fixedly connected to the second limiting structure 112 after being moved in the direction of the second limiting structure 112. In this way, the locking pin 20 can be fixed in different positions.

[0047] The two limiting structures correspond to the "open" and "closed" working states of the lock pin 20. Specifically, the first limiting structure 111 corresponds to the "open" working state of the lock pin 20; the second limiting structure 112 corresponds to the "closed" working state of the lock pin 20.

[0048] like Figure 6As shown, in the "open" working state, the lock pin 20 is in the upward position, the lock tongue 23 is accommodated in the accommodating space 11 and the switch 40 is turned on, allowing the module in the system frame 80 to be plugged in and out; in the "closed" working state, the lock pin 20 is in the downward position, the lock tongue 23 extends from the accommodating space 11 to the locking structure on the system frame 80, at which time the module is locked and the switch 40 is disconnected.

[0049] The locking pin 20 is provided with a locking tongue 23. When the locking pin 20 is fixedly matched with the first limiting structure 111, the locking tongue 23 is received in the accommodating space 11.

[0050] When the locking pin 20 is fixedly engaged with the second limiting structure 112 , the locking tongue 23 extends from the accommodating space 11 .

[0051] The locking tongue 23 can be an integral extension of the locking pin 20, or a separate component later fixed to the locking pin 20. The length of the locking tongue 23 should be designed to ensure that the locking pin 20 can be completely retracted into the accommodating space 11 when the locking pin 20 is in the upward position, and can fully extend out of the accommodating space 11 when the locking pin 20 is in the downward position to achieve the locking function.

[0052] This design links the position of the locking pin 20 with the locking function. When the lock tongue 23 is stored, the module can be freely inserted and removed; when the lock tongue 23 is extended, it can cooperate with the external structure (such as the system frame 80) to lock the module.

[0053] The switch 40 includes a switch spring arm 41, which is used to cooperate with the lock pin 20. Figure 9 As shown, the switch 40 can be a common micro switch, and the switch spring arm 41 is its trigger structure.

[0054] When the locking pin 20 is fixedly engaged with the first limiting structure 111 , the locking pin 20 presses the switch elastic arm 41 to turn on the switch 40 .

[0055] When the locking pin 20 is fixedly engaged with the second limiting structure 112 , the locking pin 20 releases the switch elastic arm 41 , thereby disconnecting the switch 40 .

[0056] This design realizes the linkage between the position of the lock pin 20 and the state of the switch 40, thereby achieving the purpose of controlling the on and off of the circuit through the lock operation.

[0057] In this embodiment, the lock seat includes a lock body 10 and a lock cover 30. The lock cover 30 is connected to the lock body 10 to form an accommodating space 11. The lock body 10, the lock pin 20 and the lock cover 30 are combined to form a lock.

[0058] In this embodiment, the lock cover 30 and the lock body 10 cooperate with each other through the concave and convex teeth, and are combined together to form an accommodating space 11 for accommodating the lock pin 20.

[0059] Specifically, the two opposing outer walls of the lock cover 30 are each provided with a plurality of spaced-apart ridges (not shown in the drawings). Grooves are formed between these ridges. Simultaneously, the two opposing inner walls of the lock body 10 are also each provided with a plurality of spaced-apart ridges (not shown in the drawings). Grooves are also formed between these ridges.

[0060] The ridges of the lock body 10 and the ridges of the outer wall of the lock cover 30 are staggered in position. The lock cover 30 is inserted into the inner side of the lock body 10 along the length direction, so that the ridges of the former are inserted into the grooves of the latter, and at the same time, the ridges of the latter are also inserted into the grooves of the former.

[0061] After the lock body 10 and the lock cover 30 are assembled, the lock cover 30 can be fixedly connected to the lock body 10 by screws or the like. Before assembly, the lock pin 20 should be placed in the lock body 10. This completes the assembly of the lock.

[0062] In this embodiment, the provision of the lock cover 30 serves to limit the movement direction of the lock pin 20, ensuring that the lock pin 20 can only move in a preset direction. In other words, the lock pin 20 can only move up or down, thereby improving its stability during use.

[0063] In this embodiment, the accommodating space 11 formed by the combination of the lock body 10 and the lock cover 30 is a channel with opposite ends open. Figure 6 As shown, the opposite ends here are the top and bottom ends of the channel.

[0064] The first limiting structure 111 and the second limiting structure 112 are distributed along the length (height) direction of the channel. Specifically, the first limiting structure 111 and the second limiting structure 112 are distributed in the channel at intervals.

[0065] In other embodiments, if the lock composed of the lock body 10 , the lock cover 30 and the lock pin 20 therebetween is placed horizontally, the above-mentioned opposite ends are the left end and the right end of the channel.

[0066] In one embodiment, the locking pin 20 is provided with a boss portion 22. When the locking pin 20 is in the upward position, the boss portion 22 abuts against the switch spring arm 41. When the locking pin 20 is in the downward position, the boss portion 22 releases the switch spring arm 41. Release here can mean that the boss portion 22 is separated from the switch spring arm 41, returning it to a non-abutted state.

[0067] The boss portion 22 may be a raised structure integrally formed on the locking pin 20 , or may be an independent component fixed to the locking pin 20 at a later stage.

[0068] The height and shape of the boss 22 must match the switch spring arm 41 to ensure that when the latch pin 20 is in the upward position, it can effectively abut (press) the switch spring arm 41, turning the switch 40 on; and when the latch pin 20 is in the downward position, it can disengage the switch spring arm 41, turning the switch 40 off. This design achieves a linkage between the position of the latch pin 20 and the state of the switch 40.

[0069] In one embodiment, the first limiting structure 111 and the second limiting structure 112 are respectively provided as limiting holes on the lock seat. The first limiting structure 111 is provided on the lock cover 30, and the second limiting structure 112 is provided on the lock body 10.

[0070] The lock pin 20 is provided with a lock spring arm 21, and the lock spring arm 21 is provided with a protrusion 211. When the lock pin 20 slides in the accommodating space 11, the protrusion 211 can be embedded in the first limiting structure 111 or the second limiting structure 112, thereby fixing the lock pin 20 in the corresponding position.

[0071] The latch spring arm 21 can be a resilient arm-shaped structure formed by a notch (not shown) on the latch pin 20. The protrusion 211 is a small protrusion or spherical structure on the latch spring arm 21. The stopper hole can be a small hole or groove on the inner wall of the latch body 10.

[0072] When the locking pin 20 slides in the accommodating space 11 , the locking elastic arm 21 slides and deforms accordingly, and the protruding portion 211 also slides accordingly.

[0073] When the locking pin 20 reaches the position of the first limiting structure 111 or the second limiting structure 112, the protrusion 211 will "click" into the corresponding limiting hole under the elastic action of the locking spring arm 21, thereby fixing the locking pin 20 in that position. This design not only accurately positions the locking pin 20, but also provides clear audio / tactile feedback to the operator.

[0074] In one embodiment, a guide groove 12 is formed on the inner wall of the lock body 10 and extends outwardly therethrough. A handle 24 is inserted into the guide groove 12 and fixedly connected to the lock pin 20 .

[0075] The guide slot 12 is a hole reserved on the lock body 10, and its width and length need to match the size and range of movement of the handle 24. The handle 24 can be a protrusion integrally formed with the lock pin 20, or it can be an independent component fixed to the lock pin 20 later.

[0076] The handle 24 extends through the guide slot 12 to the outside of the lock body 10, facilitating the operator to directly control the position of the lock bolt 20. By moving the handle 24 up and down, the operator can conveniently switch the lock bolt 20 between the positions of the first limiting structure 111 and the second limiting structure 112. This design improves the operational convenience of the device.

[0077] In this embodiment, the length direction of the guide slot 12 is consistent with the length direction of the lock body 10. The length of the guide slot 12 is shorter than the length of the lock body 10. The two ends of the guide slot 12 are respectively spaced apart from the corresponding ends of the lock body 10.

[0078] This way, the moving range of the handle 24 also serves to limit the large movement of the lock bolt 20, preventing excessive movement and causing the lock bolt 20 to fall off.

[0079] In one embodiment, the lock switch device further includes a printed circuit board 50 and a socket 60. The switch 40 and the socket 60 are arranged on opposite sides of the printed circuit board 50.

[0080] The printed circuit board 50 is provided with a conductive circuit connecting the switch 40 and the socket 60. As shown, the switch 40 is fixed to the bottom surface of the printed circuit board 50, and the socket 60 is fixed to the top surface of the printed circuit board 50. Figure 10

[0081] This design integrates the lock switch device with the switch 40, forming a complete functional module. The state of the switch 40 directly controls the on-off of the socket 60, and the socket 60 can be connected with external equipment (such as a system plug frame 80), realizing the electrical connection of the module.

[0082] In one embodiment, a module using the above-mentioned lock switch device is also provided. The module includes a panel 70, and the lock switch device is arranged in the panel 70.

[0083] The panel 70 is respectively provided with a first through hole 71 and a second through hole 72, the first through hole 71 corresponding to the position of the lock bolt 23 of the lock switch device, and the second through hole 72 corresponding to the position of the handle 24 of the lock switch device.

[0084] The position and size of the first through hole 71 are matched with the lock bolt 23, so that the lock bolt 23 can extend out of the panel 70 from the first through hole 71 when needed. The position and size of the second through hole 72 are matched with the handle 24, so that the handle 24 can extend to the outside of the panel 70 through the second through hole 72, facilitating operation.

[0085] ​This design integrates the lock and switch mechanism into the module panel 70, protecting the lock and switch mechanism while allowing its functional components (lock tongue 23 and handle 24) to interact with the external environment. This integrated design not only improves the integrity of the module but also facilitates its installation and operation.

[0086] In this embodiment, the module further includes a detection circuit module. When the switch 40 is on, the detection circuit module detects a low-level signal and controls the module to disconnect the power supply; when the switch 40 is off, the detection circuit module detects a high-level signal and controls the module to connect the power supply.

[0087] In one embodiment, an inverter module system is further provided, which includes a system frame 80 , and an inverter module, which is the module of the above embodiment, is disposed in the system frame 80 .

[0088] The system frame 80 is provided with a locking structure that cooperates with the lock tongue 23. The locking structure can cooperate with the lock tongue 23 after it extends to limit the position of the module.

[0089] In this embodiment, a limit plate 81 is provided between the system frame 80 and the module. A locking mechanism, specifically a notch 811, is provided on the limit plate 81. When the locking tongue 23 is extended, it can penetrate into the notch 811, thereby securing the module and preventing it from being pulled out.

[0090] In this embodiment, the system frame 80 has a backplane socket (not shown in the drawings) for electrically connecting to the module socket 60. The locking tongue 23 can only extend and pass through the bayonet 811 after the backplane socket and the module socket 60 are fully matched.

[0091] In the above embodiment, the function of switch 40 is not to directly control the power supply of the module, but to provide a status signal (high / low level) to the internal detection circuit of the module. This signal serves as a condition for whether the module can be turned on. The specific working logic is as follows:

[0092] When the handle 24 is upward (“open” position):

[0093] The boss 22 presses the switch spring arm 41 → the switch 40 is closed → a low level is detected;

[0094] The module determines that the power-on conditions are not met → no voltage is output;

[0095] When the handle 24 moves downward ("off" position):

[0096] The boss 22 releases the switch spring arm 41 → the switch 40 is disconnected → a high level is detected;

[0097] The module determines that the power-on conditions are met → normal output voltage.

[0098] In one embodiment, a method for plugging and unplugging the module system is also provided. The method comprises the following steps:

[0099] S1. The locking pin 20 is fixedly matched with the first limiting structure 111:

[0100] The operator pulls up the handle 24 to move the locking pin 20 until it is fixedly engaged with the first limiting structure 111. At this time, the locking tongue 23 is received in the accommodating space 11 and does not extend from the first through hole 71 of the panel 70, and the module is in a pluggable state.

[0101] S2. Insert the module into the system frame 80:

[0102] like Figure 17 As shown, align the module with the slot of the system frame 80 and push it in. Since the locking tongue 23 is in the storage state, the module can be inserted smoothly.

[0103] S3. When the module is fully inserted into the system frame 80, the locking pin 20 is disengaged from the first limiting structure 111 and fixedly engaged with the second limiting structure 112.

[0104] like Figure 18 and Figure 19 As shown, the operator moves the handle 24 downward, causing the locking pin 20 to first disengage from the first retaining structure 111 and then move it until it is securely engaged with the second retaining structure 112. At this point, the locking tongue 23 extends from the first through hole 71 of the panel 70 and engages with the system frame 80 to lock the module and connect the circuit.

[0105] The complete insertion here refers to that the pins of the system plug-in frame 80 can fully cooperate with the socket 60 of the module. Under the premise of full cooperation, the lock tongue 23 can cooperate with the system plug-in frame 80 to realize the locking of the module.

[0106] S4. When the module needs to be removed, the locking pin 20 is disengaged from the second limiting structure 112 and fixedly engaged with the first limiting structure 111:

[0107] The operator pulls up the handle 24 to first disengage the locking pin 20 from the second limiting structure 112 and then moves it until it is fixedly engaged with the first limiting structure 111 to disconnect the circuit and release the lock.

[0108] S5. Pull out the module:

[0109] When the locking tongue 23 is stored and the circuit is disconnected, the module is pulled out from the system frame 80 .

[0110] This plug-in / plug-out method achieves module locking / unlocking and circuit connection / disconnection through mechanical linkage, effectively preventing accidental removal of the module while it is powered, improving system safety and reliability. Furthermore, this method is simple and intuitive to operate, reducing the risk of misoperation.

[0111] In the above embodiment, the mechanical linkage between the two positions of the locking pin 20, the locking tongue 23, and the switch state ensures that the module's position lock is forcibly aligned with the power supply state, ensuring that the module can only be powered on after being fully inserted, and that the module can only be removed after being powered off. Ultimately, this prevents arc discharge during insertion and arc burns caused by hot removal.

[0112] The above is only a further embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solution and concept of the present invention within the scope disclosed by the present invention, which falls within the protection scope of the present invention.

Claims

1. A lock switch device, characterized in that: include: A lock seat, a lock pin (20) and a switch (40); the lock seat is provided with a first limiting structure (111) and a second limiting structure (112); and an accommodating space (11) is provided in the lock seat; The locking pin (20) is movably arranged in the accommodating space (11) and can form a fixed fit with the first limiting structure (111) or the second limiting structure (112); The lock pin (20) is provided with a lock tongue (23), and the switch (40) includes a switch elastic arm (41) matched with the lock pin (20); When the locking pin (20) is fixedly engaged with the first limiting structure (111), the locking pin (20) presses the switch elastic arm (41) to turn on the switch (40), and the locking tongue (23) is received in the accommodating space (11); When the locking pin (20) is fixedly engaged with the second limiting structure (112), the locking pin (20) releases the switch elastic arm (41) to disconnect the switch (40), and the locking tongue (23) extends from the accommodating space (11).

2. The lock switch device according to claim 1, characterized in that: The lock pin (20) is provided with a boss portion (22) opposite to the lock tongue (23), and the boss portion (22) is used to press the switch elastic arm (41).

3. The lock switch device according to claim 1, characterized in that: The first limiting structure (111) and the second limiting structure (112) are respectively limiting holes; the locking pin (20) is provided with a locking spring arm (21); and the locking spring arm (21) is provided with a protrusion (211) for embedding into the first limiting structure (111) or the second limiting structure (112).

4. The lock switch device according to claim 1, characterized in that: The lock seat comprises a lock body (10) and a lock cover (30), and the lock cover (30) is connected to the lock body to form the accommodating space (11).

5. The lock switch device according to claim 4, characterized in that: The accommodating space (11) is a channel with opposite end openings, and the first limiting structure (111) and the second limiting structure (112) are distributed along the length direction of the channel.

6. The lock switch device according to claim 5, characterized in that: A guide groove (12) is formed on the inner wall of the lock body (10) and extends outwardly therethrough. A handle (24) passing through the guide groove (12) is fixed on the lock pin (20).

7. The lock switch device according to any one of claims 1 to 6, characterized in that: The lock switch device further comprises a printed circuit board (50) and a socket (60), wherein the switch (40) and the socket (60) are arranged on opposite sides of the printed circuit board (50).

8. A module, characterized in that: include: A panel (70), wherein the panel (70) is provided with a lock switch device according to any one of claims 1 to 7, and the panel (70) is provided with a first through hole (71) for the lock tongue (23) to extend out and a second through hole (72) for the handle (24) of the lock switch device to pass through.

9. An inverter module system, characterized in that: include: A system plug-in frame (80), wherein the module according to claim 8 is arranged therein, and a locking structure cooperating with the lock tongue (23) is provided on the system plug-in frame (80).

10. The inverter module system according to claim 9, characterized in that: The locking structure is a bayonet (811) arranged corresponding to the locking tongue (23).

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