Double-lock locking valve

Abstract

The utility model discloses a double-lock locking valve which comprises a valve body, a valve element and a valve rod, the valve element is arranged in the valve body, one end of the valve rod is connected with the valve element and can drive the valve element to rotate, the valve body is provided with a locking cavity, the other end of the valve rod is arranged at the bottom of the locking cavity, and a first locking mechanism and a second locking mechanism are arranged in the locking cavity. The first locking mechanism is arranged at the bottom of the locking cavity to limit rotation of the valve rod, the second locking mechanism is arranged at the top of the locking cavity to seal the locking cavity, and the locking valve further comprises an unlocking handle to unlock locking of the first locking mechanism and the second locking mechanism. According to the locking valve, the locking effect of the locking valve can be improved, the possibility of man-made damage and theft opening is reduced, sundries can be prevented from entering the locking cavity, and the service life of the locking valve is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and particularly relates to a double-lock shut-off valve. Background Art

[0002] To achieve water supply safety, conservation, anti-theft, and better control the water flow, water supply units or community property management will install shut-off valves on the water conveyance pipelines to prevent others from arbitrarily opening and closing the valves. The existing shut-off valves generally have a single structure, which allows others to easily open them without using the supporting tools, arbitrarily open and close the valves, causing losses to the water supply units and posing certain safety hazards. Content of the Utility Model

[0003] The purpose of the utility model is to solve the above-mentioned technical problems existing in the prior art, and provide a double-lock shut-off valve, which can improve the locking effect of the shut-off valve, reduce the possibility of man-made damage and unauthorized opening, and can prevent foreign objects from entering the locking cavity, prolonging the service life of the shut-off valve.

[0004] To solve the above technical problems, the utility model adopts the following technical scheme:

[0005] A double-lock shut-off valve, comprising a valve body, a valve core and a valve rod. The valve core is arranged in the valve body, and one end of the valve rod is connected to the valve core and can drive the valve core to rotate. It is characterized in that: the valve body is provided with a locking cavity, the other end of the valve rod is arranged at the bottom of the locking cavity, the locking cavity is provided with a first locking mechanism and a second locking mechanism, the first locking mechanism is arranged at the bottom of the locking cavity to limit the rotation of the valve rod, the second locking mechanism is arranged at the top of the locking cavity to close the locking cavity, and the shut-off valve further includes an unlocking handle to release the locking of the first locking mechanism and the second locking mechanism.

[0006] Further, the first locking mechanism includes a first card slot, a first locking magnet and a first spring. The first card slot is arranged on the valve body, the valve rod is provided with a movable slot, the first locking magnet and the first spring are both arranged in the movable slot, the first locking magnet is movably connected with the movable slot, and the first locking magnet is clamped in the first card slot under the action of the first spring.

[0007] Further, the valve rod is provided with a first limit convex block, and the valve body is provided with a first limit slot. The first limit convex block is arranged in the first limit slot to limit the rotation angle of the valve rod.

[0008] Further, the shut-off valve further includes an unlocking handle to release the locking of the first locking mechanism. The unlocking handle is provided with a sleeve, the sleeve is provided with a connecting slot, the valve rod is provided with a connecting block, the connecting block is arranged in the connecting slot, the sleeve is provided with a first unlocking magnet, the position of the first unlocking magnet corresponds to that of the first locking magnet, and the first unlocking magnet repels the first locking magnet and can make the first locking magnet withdraw from the card slot when the sleeve is sleeved on the valve body.

[0009] Furthermore, the cross-sectional shape of the connecting block is any one or at least two combinations of a polygon, a circle, and a sector.

[0010] Furthermore, the first locking mechanism includes a collar, a second locking magnet, and a second spring. The collar is disposed in the locking cavity, the valve stem is disposed in the collar and is rotatably connected to the collar. The collar is provided with a sliding groove, the second locking magnet and the spring are disposed in the sliding groove, the valve stem is provided with a second card slot, and the second locking magnet is clamped in the second card slot under the action of the second spring to limit the rotation of the valve stem.

[0011] Furthermore, the lock valve further includes an unlocking handle to release the locking of the first locking mechanism. The unlocking handle is provided with an unlocking rod, the valve stem is provided with an unlocking hole, the unlocking rod is disposed in the unlocking hole, the unlocking rod is provided with a second unlocking magnet, and the second unlocking magnet repels the second locking magnet so that the second locking magnet exits from the locking cavity.

[0012] Furthermore, the collar is provided with a second limiting protrusion, and the valve stem is provided with a second limiting groove. The second limiting protrusion is disposed in the second limiting groove to limit the rotation of the valve stem.

[0013] Furthermore, the second locking mechanism includes a plugging block, a movable block, a third spring, and a locking ball. The plugging block is provided with a movable cavity, the movable block is disposed in the movable cavity and is slidably connected to the movable cavity. One end of the third spring abuts against the movable block, and the other end of the third spring abuts against the inner side wall of the plugging block. The plugging block is provided with a receiving hole for receiving the locking ball, and the outer side wall of the plugging block is provided with a receiving groove. The movable block makes the receiving hole and the receiving groove misaligned under the action of the third spring, and the locking ball is pushed against the receiving hole under the action of the movable block. The valve body is provided with a stepped portion, and the locking ball protrudes partially from the outer side wall of the plugging block and is clamped on the stepped portion under the action of the movable block.

[0014] Furthermore, the lock valve further includes an unlocking handle to release the locking of the second locking mechanism. The movable block is provided with a plurality of third locking magnets, and the unlocking handle is provided with a third unlocking magnet. The third locking magnets and the third unlocking magnet can attract each other.

[0015] The utility model has the following beneficial effects due to the adoption of the above technical solutions:

[0016] By setting the first locking mechanism, the second locking mechanism, and the locking cavity, the utility model can lock the valve stem and seal the locking cavity, thereby realizing double locking of the lock valve, improving the locking effect of the lock valve, reducing the possibility of man-made damage and unauthorized opening, and the second locking mechanism can block the locking cavity to prevent sundries from entering the locking cavity and causing the lock valve to lose its locking function, and prolonging the service life of the lock valve. Description of the Drawings

[0017] The present utility model will be further described below in conjunction with the accompanying drawings:

[0018] Figure 1 It is a schematic structural diagram of a double-lock valve of the present utility model;

[0019] Figure 2 It is a schematic structural diagram of the first embodiment of the present utility model;

[0020] Figure 3 It is a schematic structural diagram of the first valve stem in the first embodiment;

[0021] Figure 4 It is a schematic structural diagram of the second valve stem in the first embodiment;

[0022] Figure 5 It is a schematic structural diagram of the third valve stem in the first embodiment;

[0023] Figure 6 It is a schematic structural diagram of the first limit groove in the first embodiment;

[0024] Figure 7 It is a schematic structural diagram of the unlocking handle in the first embodiment;

[0025] Figure 8 It is a schematic structural diagram of the inside of the unlocking handle in the first embodiment;

[0026] Figure 9 It is a schematic structural diagram of the second embodiment of the present utility model;

[0027] Figure 10 It is a schematic structural diagram of the valve stem in the second embodiment;

[0028] Figure 11 It is a schematic structural diagram of the connection between the valve stem and the collar in the second embodiment;

[0029] Figure 12 It is a schematic structural diagram of the unlocking handle in the second embodiment;

[0030] Figure 13 It is a schematic structural diagram of the inside of the unlocking handle in the second embodiment;

[0031] Figure 14 It is a schematic structural diagram of the second locking mechanism of the present utility model;

[0032] Figure 15 It is a schematic structural diagram of the inside of the second locking mechanism of the present utility model;

[0033] Figure 16 It is a schematic structural diagram of the third embodiment of the present utility model;

[0034] Figure 17Schematic diagram of the structure where the first locking mechanism and the second locking mechanism are arranged in the locking cavity in Embodiment 3 (the gate plate is not shown);

[0035] Figure 18 Schematic diagram of the structure of the first card slot in Embodiment 3.

[0036] In the figure, 1 - valve body; 2 - valve core; 3 - valve stem; 4 - locking cavity; 5 - first locking mechanism; 6 - second locking mechanism; 7 - unlocking handle; 8 - first card slot; 9 - first locking magnet; 10 - first spring; 11 - moving slot; 12 - first limiting projection; 13 - first limiting groove; 14 - sleeve; 15 - connecting slot; 16 - connecting block; 17 - first unlocking magnet; 18 - collar; 19 - second locking magnet; 20 - second spring; 21 - sliding slot; 22 - second card slot; 23 - unlocking rod; 24 - unlocking hole; 25 - second unlocking magnet; 26 - second limiting projection; 27 - second limiting groove; 28 - plugging block; 29 - moving block; 30 - third spring; 31 - locking ball; 32 - moving cavity; 33 - accommodating hole; 34 - accommodating groove; 35 - step portion; 36 - third locking magnet; 37 - third unlocking magnet. Detailed implementation manners

[0037] As Figure 1 shown, a double - lock closing valve of the present utility model includes a valve body 1, a valve core 2 and a valve stem 3. The valve body 1 serves as the shell of the closing valve and is used to install and fix the valve core 2 and the valve stem 3. The valve core 2 is spherical and is arranged in the valve body 1, and is used to open and close and control the flow rate passing through the valve body 1. One end of the valve stem 3 is connected to the valve core 2 and can drive the valve core 2 to rotate. Specifically, the valve body 1 is provided with a locking cavity 4. The other end of the valve stem 3 is arranged at the bottom of the locking cavity 4. The locking cavity 4 is provided with a first locking mechanism 5 and a second locking mechanism 6. The first locking mechanism 5 is arranged at the bottom of the locking cavity 4 to limit the rotation of the valve stem 3, and the second locking mechanism 6 is arranged at the top of the locking cavity 4 to seal the locking cavity 4. Through the above settings, the valve stem 3 can be locked, and the locking cavity 4 can also be sealed, realizing double - locking of the closing valve, improving the locking effect of the closing valve, reducing the possibility of man - made damage and unauthorized opening, and the second locking mechanism 6 can block the locking cavity 4 to prevent sundries from entering the locking cavity 4 and causing the closing valve to lose its locking function, thus prolonging the service life of the closing valve. The valves of this application include but are not limited to valves, gate valves, globe valves, etc.

[0038] As Figures 2 to 8As shown in the figure, this is the first embodiment of the present application. The first locking mechanism 5 includes a first card slot 8, a first locking magnet 9, and a first spring 10. The first card slot 8 is provided on the valve body 1, and the valve stem 3 is provided with a movable slot 11. The first locking magnet 9 and the first spring 10 are both arranged in the movable slot 11. The first locking magnet 9 is movably connected to the movable slot 11, and the first locking magnet 9 is clamped in the first card slot 8 under the action of the first spring 10. Through the above settings, the valve stem 3 can be locked, thus preventing others from randomly opening and closing the shut-off valve. When the valve stem 3 rotates to the closed angle, the first locking magnet 9 is inserted into the first card slot 8 to restrict the rotation of the valve stem 3. When it is necessary to rotate the valve stem 3, only need to make the first locking magnet 9 withdraw from the first card slot 8.

[0039] Specifically, the valve stem 3 is provided with a first limit convex block 12, and the valve body 1 is provided with a first limit slot 13. The first limit convex block 12 is arranged in the first limit slot 13 to limit the rotation angle of the valve stem 3. Through the above settings, the rotation angle of the valve stem 3 can be restricted, ensuring the opening and closing effects of the shut-off valve. The rotation angle of the valve stem 3 is generally limited to 0-90°.

[0040] As Figure 7 and Figure 8 shown in the figure, in this embodiment, the shut-off valve further includes an unlocking handle 7 to release the lock of the first locking mechanism 5. The unlocking handle 7 is provided with a sleeve 14, and the sleeve 14 is provided with a connecting slot 15. The valve stem 3 is provided with a connecting block 16, and the connecting block 16 is arranged in the connecting slot 15. The sleeve 14 is provided with a first unlocking magnet 17, and the position of the first unlocking magnet 17 corresponds to that of the first locking magnet 9. The first unlocking magnet 17 repels the first locking magnet 9 and can make the first locking magnet 9 withdraw from the card slot when the sleeve 14 is sleeved on the valve body 1. Through the settings of the connecting slot 15 and the connecting block 16, the connection between the unlocking handle 7 and the valve stem 3 can be facilitated, so that the valve stem 3 can be rotated conveniently through the unlocking handle 7, facilitating the opening and closing of the shut-off valve. The first unlocking magnet 17 and the first locking magnet 9 cooperate with each other to realize the unlocking of the first locking magnet 9, facilitating the release of the lock of the valve stem 3 and the rotation of the valve stem 3. The connecting block 16 can also be arranged on the unlocking handle 7. Correspondingly, the connecting slot 15 is arranged on the valve stem 3.

[0041] As Figures 3 to 5 shown in the figure, the cross-sectional shape of the connecting block 16 is any one or at least two combinations of polygon, circle, and sector. The shape of the connecting block 16 can be a triangular prism with a triangular cross-section, a cuboid with a quadrilateral cross-section, an arrow shape formed by splicing a quadrilateral and a triangle, etc. An indicating structure is generally arranged on the connecting block 16 and the indicating structure corresponds to the orientation of the valve core 2. For example, in the arrow-shaped connecting block 16, the direction of the arrow is consistent with the inner opening direction of the valve core 2. When the arrow faces the pipeline extension direction, it indicates that the valve body 1 is in the open state.

[0042] As shown in Figures 9 to 13 , Embodiment 2 of the present application. The first locking mechanism 5 includes a collar 18, a second locking magnet 19, and a second spring 20. The collar 18 is disposed in the locking cavity 4. The valve stem 3 is disposed in the collar 18 and is rotatably connected to the collar 18. The collar 18 is provided with a sliding groove 21. The second locking magnet 19 and the spring are disposed in the sliding groove 21. The valve stem 3 is provided with a second card slot 22. The second locking magnet 19 is clamped in the second card slot 22 under the action of the second spring 20 to limit the rotation of the valve stem 3. Through the above arrangement, the valve stem 3 can be locked, thereby preventing others from arbitrarily unlocking and locking the shut-off valve.

[0043] As shown in Figure 12 and Figure 13 , specifically, the shut-off valve further includes an unlocking handle 7 to release the locking of the first locking mechanism 5. The unlocking handle 7 is provided with an unlocking rod 23. The valve stem 3 is provided with an unlocking hole 24. The unlocking rod 23 is disposed in the unlocking hole 24. The unlocking rod 23 is provided with a second unlocking magnet 25. The second unlocking magnet 25 repels the second locking magnet 19 to cause the second locking magnet 19 to withdraw from the locking cavity 4. Through the above arrangement, the locking of the valve stem 3 can be easily released, facilitating the unlocking and locking of the shut-off valve. The unlocking rod 23 can be provided with a special shape to match the unlocking hole 24, so that when the unlocking rod 23 is inserted into the unlocking hole 24, the second unlocking magnet 25 can correspond to the position of the second locking magnet 19, thereby facilitating the release of the locking of the valve stem 3.

[0044] As shown in Figure 11 , in this embodiment, the collar 18 is provided with a second limiting convex block 26, and the valve stem 3 is provided with a second limiting groove 27. The second limiting convex block 26 is disposed in the second limiting groove 27 to limit the rotation of the valve stem 3. Through the above arrangement, the rotation angle of the valve stem 3 can be limited, ensuring the opening and closing effects of the shut-off valve.

[0045] As shown in Figure 14 and Figure 15As shown, as an implementation, the second locking mechanism 6 includes a plugging block 28, a movable block 29, a third spring 30, and a locking ball 31. The plugging block 28 is provided with a movable cavity 32. The movable block 29 is arranged in the movable cavity 32 and is slidably connected to the movable cavity 32. One end of the third spring abuts against the movable block 29, and the other end of the third spring 30 abuts against the inner side wall of the plugging block 28. The plugging block 28 is provided with a receiving hole 33 for receiving the locking ball 31. The outer side wall of the movable block 29 is provided with a receiving groove 34. Under the action of the third spring 30, the movable block 29 dislocates the receiving hole 33 and the receiving groove 34, and the locking ball 31 is pressed against the receiving hole 33 under the action of the movable block 29. The valve body 1 is provided with a stepped portion 35. The locking ball 31 protrudes partially from the outer side wall of the plugging block 28 under the action of the movable block 29 and is stuck on the stepped portion 35. Through the above arrangement, the plugging of the locking cavity 4 can be realized, preventing others from directly unlocking the first locking mechanism 5. Moreover, it can prevent sundries from entering the locking cavity 4, avoid the locking function of the locking valve from being lost, and extend the service life of the locking valve. Under normal circumstances, the movable block 29 is pressed to the bottom of the movable cavity 32 under the action of the third spring 30, causing the receiving hole 33 and the receiving groove 34 to be dislocated. At this time, the locking ball 31 in the receiving hole 33 is pressed tightly into the receiving hole 33 under the pressing action of the outer wall of the movable block 29. And since the outermost opening of the receiving hole 33 is smaller than the radius of the locking ball 31, part of the locking ball 31 can protrude from the outer side wall of the plugging block 28 without falling out of the receiving hole 33, so that the locking ball 31 is stuck on the stepped portion 35.

[0046] Specifically, the locking valve further includes an unlocking handle 7 to release the locking of the second locking mechanism 6. A plurality of third locking magnets 36 are arranged on the movable block, and a third unlocking magnet 37 is arranged on the unlocking handle 7. The third locking magnet 36 and the third unlocking magnet can attract each other. Through the mutual attraction of the third locking magnet 36 and the third unlocking magnet 37, the movable block 29 can be moved upward under the action of the third unlocking magnet 37 to overcome the elastic force of the third spring 30, so that the positions of the receiving hole 33 and the receiving groove 34 correspond to each other. At this time, the locking ball 31 can roll into the receiving groove 34 to release the locked state. The number of the third locking magnets 36 is generally four, which are evenly distributed along the center of the movable block. When the four third locking magnets 36 are arranged, half of the third locking magnets 36 have the positive pole facing up, and half of the third locking magnets 36 have the negative pole facing up.

[0047] As Figures 16 to 18 shown, this is the third embodiment of the present application. In the third embodiment, the valve body 1 adopts a gate valve. The number of the first card slots 8 can be set according to the application scenario of the gate valve, and is at least one, which is used to cooperate with the first locking magnet 9 to limit the rotation of the valve stem 3. Generally, the number of the first card slots 8 is four, which are evenly distributed circumferentially on the inner side wall of the valve body 1, as Figure 18As shown in the figure. Since the rotation angle of the valve stem 1 in the gate valve generally exceeds 90°, a limit structure is not provided to limit the rotation angle of the valve stem 3. When the valve stem 3 rotates clockwise or counterclockwise to the bottom and cannot rotate anymore, it means that the gate (valve core) is completely closed or opened.

[0048] Through the provision of the first locking mechanism 5, the second locking mechanism 6 and the locking cavity 4, the present utility model can lock the valve stem 3 and seal the locking cavity 4, thereby achieving double locking of the locked valve, improving the locking effect of the locked valve, reducing the possibility of man-made damage and unauthorized opening, and the second locking mechanism 6 can block the locking cavity 4 to prevent sundries from entering the locking cavity 4 and causing the locked valve to lose its locking function, thus extending the service life of the locked valve.

[0049] The above are only specific embodiments of the present utility model, but the technical features of the present utility model are not limited thereto. Any simple changes, equivalent substitutions or modifications made on the basis of the present utility model to solve basically the same technical problems and achieve basically the same technical effects are all covered by the protection scope of the present utility model.

Claims

1. A double-lock locking valve, comprising a valve body, a valve core and a valve stem, wherein the valve core is arranged in the valve body, one end of the valve stem is connected to the valve core and can drive the valve core to rotate, and is characterized in that: The valve body is provided with a locking cavity, the other end of the valve stem is arranged at the bottom of the locking cavity, a first locking mechanism and a second locking mechanism are arranged in the locking cavity, the first locking mechanism is arranged at the bottom of the locking cavity to limit the rotation of the valve stem, and the second locking mechanism is arranged at the top of the locking cavity to close the locking cavity; The first locking mechanism includes a first clamping groove, a first locking magnet and a first spring. The first clamping groove is arranged on the valve body. The valve stem is provided with a movable groove. The first locking magnet and the first spring are both arranged in the movable groove. The first locking magnet is movably connected with the movable groove. The first locking magnet is clamped in the first clamping groove under the action of the first spring.

2. The double-lock closed valve according to claim 1, characterized in that: The valve stem is provided with a first limiting convex block, and the valve body is provided with a first limiting groove. The first limiting convex block is arranged in the first limiting groove to limit the rotation angle of the valve stem.

3. A double-lock locking valve according to claim 1, characterized in that: The lock valve further includes an unlocking handle to release the locking of the first locking mechanism. The unlocking handle is provided with a sleeve. The sleeve is provided with a connecting groove. The valve stem is provided with a connecting block. The connecting block is arranged in the connecting groove. The sleeve is provided with a first unlocking magnet. The position of the first unlocking magnet corresponds to that of the first locking magnet. The first unlocking magnet repels the first locking magnet and can make the first locking magnet withdraw from the clamping groove when the sleeve is sleeved on the valve body.

4. The double-lock closing valve according to claim 3, wherein: The cross-sectional shape of the connecting block is any one or at least two combinations of polygon, circle and sector.

5. A double-lock locking valve according to claim 1, characterized in that: The second locking mechanism includes a plugging block, a movable block, a third spring and a locking ball. The plugging block is provided with a movable cavity. The movable block is arranged in the movable cavity and is slidably connected with the movable cavity. One end of the third spring abuts against the movable block, and the other end of the third spring abuts against the inner side wall of the plugging block. The plugging block is provided with a receiving hole for receiving the locking ball. The outer side wall of the movable block is provided with a receiving groove. The movable block makes the receiving hole and the receiving groove misaligned under the action of the third spring and makes the locking ball abut against the receiving hole under the action of the movable block. The valve body is provided with a stepped portion. The locking ball partially protrudes from the outer side wall of the plugging block and is clamped on the stepped portion under the action of the movable block.

6. The double-lock closed valve according to claim 5, characterized in that: The lock valve further includes an unlocking handle to release the locking of the second locking mechanism. The movable block is provided with a plurality of third locking magnets, and the unlocking handle is provided with a third unlocking magnet. The third locking magnets and the third unlocking magnet can attract each other.

7. A double-lock locking valve, comprising a valve body, a valve core and a valve stem, wherein the valve core is arranged in the valve body, and one end of the valve stem is connected to the valve core and can drive the valve core to rotate, and is characterized in that: The valve body is provided with a locking cavity, the other end of the valve stem is arranged at the bottom of the locking cavity, a first locking mechanism and a second locking mechanism are arranged in the locking cavity, the first locking mechanism is arranged at the bottom of the locking cavity to limit the rotation of the valve stem, and the second locking mechanism is arranged at the top of the locking cavity to close the locking cavity; The first locking mechanism includes a collar, a second locking magnet, and a second spring. The collar is disposed in the locking cavity. The valve stem is disposed in the collar and is rotatably connected to the collar. The collar is provided with a sliding groove. The second locking magnet and the spring are disposed in the sliding groove. The valve stem is provided with a second card slot. The second locking magnet is engaged in the second card slot under the action of the second spring to limit the rotation of the valve stem.

8. The double-lock valve according to claim 7, characterized in that: The lock valve further includes an unlocking handle for releasing the locking of the first locking mechanism. The unlocking handle is provided with an unlocking rod. The valve stem is provided with an unlocking hole. The unlocking rod is disposed in the unlocking hole. The unlocking rod is provided with a second unlocking magnet. The second unlocking magnet repels the second locking magnet to cause the second locking magnet to withdraw from the locking cavity.

9. The double-lock shut-off valve according to claim 7, characterized in that: The collar is provided with a second limiting protrusion. The valve stem is provided with a second limiting groove. The second limiting protrusion is disposed in the second limiting groove to limit the rotation of the valve stem.

10. A double-lock locking valve according to claim 7, characterized in that: The second locking mechanism includes a plugging block, a movable block, a third spring, and a locking ball. The plugging block is provided with a movable cavity. The movable block is disposed in the movable cavity and is slidably connected to the movable cavity. One end of the third spring abuts against the movable block, and the other end of the third spring abuts against the inner side wall of the plugging block. The plugging block is provided with a receiving hole for receiving the locking ball. The outer side wall of the movable block is provided with a receiving groove. The movable block causes the receiving hole and the receiving groove to be misaligned under the action of the third spring, and the locking ball is pressed against the receiving hole under the action of the movable block. The valve body is provided with a stepped portion. The locking ball protrudes partially from the outer side wall of the plugging block under the action of the movable block and is engaged on the stepped portion.

11. A double-lock locking valve according to claim 10, characterized in that: The lock valve further includes an unlocking handle for releasing the locking of the second locking mechanism. The movable block is provided with a plurality of third locking magnets. The unlocking handle is provided with a third unlocking magnet. The third locking magnet and the third unlocking magnet can attract each other.

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