A nanny lock with high security

Abstract

The invention relates to a nanny lock with high safety, comprising a lock core, a master key, a nanny key and a conversion key. The lock core comprises a lock shell, a pull, an outer lock core and an inner lock core. The lock shell and the outer lock core are matched with each other through a plurality of groups of marble assemblies. Each group of marble assemblies comprises a first marble arranged in a marble hole, a first flat bead and a first flat bead reset spring arranged in a first flat bead hole, and a second flat bead and a second flat bead reset spring arranged in a second flat bead hole. The axis of the first flat bead hole and the axis of the second flat bead hole are on the same cross section and the angle between the two is α°. At least one group of marble assemblies also comprises a supplementary bead arranged between the first marble and the first flat bead or between the first marble and the second flat bead. The position of the supplementary bead is switched through the cooperation of the master key and the conversion key, and then the state of the lock is switched to control whether the nanny can open the lock, so that the use time of the nanny can be controlled and the worry problem when the nanny is replaced can be solved, and the safety is high.

Description

Technical Field

[0001] The invention relates to the technical field of locks, in particular to a nanny lock with high safety. Background Art

[0002] The nanny lock in the prior art generally has only two levels of keys (master key and nanny key). When the nanny has the nanny key, she can unlock the lock and enter at any time. The owner cannot control the time when the nanny enters the house, so the security is low. In addition, when the nanny needs to be replaced, the nanny key needs to be recovered; but users often worry that the nanny may steal the key, so they usually replace the lock when replacing the nanny, which has the problem of high cost and troublesome replacement of the lock.

[0003] Therefore, it is urgent to design a lock that can control whether the nanny can open the lock by switching the state. This can control the nanny's usage time and solve the worries when changing the nanny, with high security. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a nanny lock with high security, which switches the lock state by a key to control whether the nanny can open the lock, and has high security.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A nanny lock with high security comprises a lock core and a master key 71 and a nanny key 72 matched with the lock core, the lock core comprises a lock shell 1, a pull 2 ​​arranged in an opening groove in the middle of the lock shell 1, and an outer lock core 3 and an inner lock core 4 arranged in the lock shell 1 and located on both sides of the pull 2, the lock shell 1 and the outer lock core 3 are matched through a plurality of groups of marble assemblies 5 distributed along the key insertion direction, the nanny lock also comprises a conversion key 73, a marble hole 31 is arranged in the outer lock core 3, a first flat bead hole 11 and a second flat bead hole 12 are arranged in the lock shell 1, and each group of the marble assemblies 5 comprises a plurality of marble assemblies 5 arranged in ... arranged in a plurality of groups of marble assemblies 5 distributed along the key insertion direction, A first marble 51 is disposed in the marble hole 31, a first flat ball 52 and a first flat ball return spring 53 are disposed in the first flat ball hole 11, and a second flat ball 54 and a second flat ball return spring 55 are disposed in the second flat ball hole 12; the axis of the first flat ball hole 11 and the axis of the second flat ball hole 12 matched with the same group of marble assemblies 5 are on the same cross section and the angle between the two is α°; at least one of the plurality of groups of marble assemblies 5 further includes a supplementary bead 56 disposed between the first marble 51 and the first flat bead 52 or between the first marble 51 and the second flat bead 54;

[0007] When the supplementary bead 56 is located in the second flat bead hole 12 and the elastic bead hole 31 is aligned with the first flat bead hole 11, the lock core is in a non-nanny opening state, and the lock can be turned to unlock by inserting the master key 71, and cannot be turned to unlock by inserting the nanny key 72;

[0008] When the supplementary bead 56 is located in the marble hole 31 and the marble hole 31 is aligned with the first flat bead hole 11, the lock core is in a nanny-able openable state, and the master key 71 or the nanny key 72 can be inserted to turn and unlock;

[0009] When the lock core is in a non-nanny opening state, insert the master key 71 and rotate it toward the second flat bead hole 12 for α° and then pull it out, then insert the conversion key 73 and rotate it toward the first flat bead hole 11 for α° so that the lock core is switched to a nanny opening state;

[0010] When the lock core is in the nanny-openable state, insert the conversion key 73, rotate it toward the second flat bead hole 12, and then pull it out, and then insert the master key 71 and rotate it toward the first flat bead hole 11 to switch the lock core to the non-nanny-openable state.

[0011] As a preferred embodiment, it is further defined as: when the lock core is in a non-nanny open state, the main key 71 is inserted into the second flat bead hole 12 and rotated α°, then the replenishing bead 56 is pulled out and enters the second flat bead hole 12 under the action of the second flat bead return spring 55.

[0012] As a preferred embodiment, it is further defined as: a limiting mechanism 6 is also arranged between the lock shell 1 and the outer lock core 3, the outer lock core 3 is provided with a keyhole 30 for inserting a key, a limiting groove 32 for accommodating the limiting mechanism 6 is arranged on the outer peripheral surface of the outer lock core 3, a limiting hole 33 communicating with the keyhole 30 is arranged at the bottom of the limiting groove 32, the lock shell 1 is provided with an outer lock core hole 13 for accommodating the outer lock core 3, and a yield groove 10 is arranged on the inner wall of the outer lock core hole 13 corresponding to the limiting groove 32; the limiting mechanism 6 includes a side marble 61 and a side marble return spring 62 assembled in the limiting groove 32, one end of the side marble 61 is convexly formed with an outer protrusion 611 extending into the yield groove 10, and one end of the side marble 61 is provided with a side marble return spring 62 that can pass through the side marble return spring 62 and the limiting hole 33 and extend into the keyhole 30 The extension portion 612; the side end surfaces of the master key 71 and the conversion key 73 are both provided with avoidance grooves 75 corresponding to the extension portion 612, and the front end of the avoidance grooves 75 is an open structure, and the side end surfaces of the nanny key 72 are both provided with avoidance recesses 76 corresponding to the extension portion 612; when the outer lock core 3 is rotated, the inner wall of the outer lock core hole 13 squeezes the convex portion 611 so that the extension portion 612 extends into the keyhole 30, and the master key 71 and the conversion key 73 can be inserted into or pulled out of the keyhole 30, while the nanny key 72 cannot be inserted into or pulled out of the keyhole 30; when the ball hole 31 is aligned with the first flat ball hole 11, the convex portion 611 extends into the give way groove 10 under the action of the side ball return spring 62, and the extension portion 612 withdraws from the keyhole 30, and the master key 71, the nanny key 72 and the conversion key 73 can be inserted into or pulled out of the keyhole 30.

[0013] As a preferred embodiment, it is further defined as: the side marbles 61 are mushroom-shaped.

[0014] As a preferred embodiment, it is further defined as: the axis of the first flat bead hole 11 and the axis of the second flat bead hole 12 intersect on the rotation center line of the outer locking core 3.

[0015] As a preferred embodiment, it is further defined as: the α is 30±5.

[0016] As a preferred embodiment, it is further defined as: the teeth on the front side of the nanny key 72 are the same as the teeth on the front side of the conversion key 73.

[0017] As a preferred embodiment, it is further defined as: the nanny lock also includes a secondary key 74, the teeth on the front of the secondary key 74 are the same as the teeth on the front of the main key 71, and the side end of the secondary key 74 is provided with the avoidance recess 76; when the outer lock core 3 is rotated, the inner wall of the outer lock core hole 13 squeezes the outer protrusion 611 so that the insertion portion 612 is inserted into the keyhole 30, and the secondary key 74 cannot be inserted into or pulled out of the keyhole 30; when the ball hole 31 is aligned with the first flat ball hole 11, the outer protrusion 611 is inserted into the give way groove 10 under the action of the side ball return spring 62, and the insertion portion 612 exits the keyhole 30, and the secondary key 74 can be inserted into or pulled out of the keyhole 30.

[0018] As a preferred embodiment, it is further defined as: the lock shell 1 and the inner lock core 4 are also matched through several groups of marble assemblies 5 distributed along the key insertion direction; the marble assemblies 5 arranged between the lock shell 1 and the inner lock core 4 are distributed in the same way as the marble assemblies 5 arranged between the lock shell 1 and the outer lock core 3 along the key insertion direction; a limiting mechanism 6 is also arranged between the lock shell 1 and the inner lock core 4, and the outer lock core 3 has the same structure as the inner lock core 4.

[0019] As a preferred embodiment, it is further defined as: the lock shell 1 and the inner lock core 4 are also matched through several groups of marble assemblies 5 distributed along the key insertion direction; the distribution and structure of the marble assembly 5 arranged between the lock shell 1 and the inner lock core 4 and the marble assembly 5 arranged between the lock shell 1 and the outer lock core 3 are the same along the key insertion direction; a limiting mechanism 6 is also arranged between the lock shell 1 and the inner lock core 4, and the structure of the outer lock core 3 is the same or similar to that of the inner lock core 4.

[0020] The beneficial effects created by the present invention are as follows: each group of marble assemblies created by the present invention includes a first marble arranged in a marble hole, a first flat bead and a first flat bead reset spring arranged in a first flat bead hole, and a second flat bead and a second flat bead reset spring arranged in a second flat bead hole; the axis of the first flat bead hole and the axis of the second flat bead hole are on the same cross section and the angle between the two is α°; at least one group of marble assemblies also includes a supplementary bead arranged between the first marble and the first flat bead or between the first marble and the second flat bead; the position of the supplementary bead is switched through the cooperation of the main key and the conversion key, and then the state of the lock is switched to control whether the nanny can open the lock, so that the nanny's use time can be controlled, and the worry problem when changing the nanny can also be solved, and the safety is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the invention;

[0022] Figure 2 It is a schematic diagram of the structural decomposition of the present invention;

[0023] Figure 3 It is a transverse cross-sectional view of the invention;

[0024] Figure 4 It is a longitudinal section view of the non-nanny opening state;

[0025] Figure 5 It is a longitudinal section view of the master key inserted in the non-nanny-open state;

[0026] Figure 6 is a longitudinal sectional view of the master key inserted into the second flat bead hole and rotated α°;

[0027] Figure 7 yes Figure 6 A longitudinal sectional view after the master key is pulled out;

[0028] Figure 8 yes Figure 7 A longitudinal sectional view after the conversion key is inserted;

[0029] Fig. 9 yes Figure 8 A longitudinal sectional view of the device after the conversion key is inserted into the device and rotated toward the first flat bead hole by α°;

[0030] Fig.10 It is a longitudinal section view of the nanny in the openable state;

[0031] Fig.11 It is a schematic diagram of the structure of the side marbles;

[0032] Fig.12 It is a longitudinal cross-sectional view of the nanny inserting the master key in the unlockable state;

[0033] Fig.13 It is a longitudinal cross-sectional view of the non-nanny opening state with the secondary key inserted;

[0034] Fig.14 It is a longitudinal cross-sectional view of the nanny inserting the vice key in the unlockable state;

[0035] Fig.15 It is a longitudinal cross-sectional view of the non-nanny-open state with the conversion key inserted;

[0036] Fig.16 is a longitudinal cross-sectional view of a non-nanny-enabled state with a nanny key inserted;

[0037] Fig.17 is a longitudinal cross-sectional view of the nanny key inserted in the nanny-enabled state;

[0038] Fig.18 It is a schematic diagram of the structure of the master key;

[0039] Fig.19 This is a schematic diagram of the structure of the nanny key;

[0040] Fig. 20 It is a schematic diagram of the structure of the conversion key;

[0041] Fig.21 It is a schematic diagram of the structure of the secondary key. DETAILED DESCRIPTION

[0042] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0043] As attached Figure 1 To Attachment Fig.21 As shown, a nanny lock with high security includes a lock core and a master key 71 and a nanny key 72 adapted to the lock core, the lock core includes a lock shell 1, a pull 2 ​​arranged in an open groove in the middle of the lock shell 1, and an outer lock core 3 and an inner lock core 4 arranged in the lock shell 1 and located on both sides of the pull 2, the lock shell 1 and the outer lock core 3 are matched through a plurality of groups of marble assemblies 5 distributed along the key insertion direction, the nanny lock also includes a conversion key 73, a marble hole 31 is arranged in the outer lock core 3, a first flat bead hole 11 and a second flat bead hole 12 are arranged in the lock shell 1, and each group of the marble assemblies 5 includes A first marble 51 is arranged in the marble hole 31, a first flat ball 52 and a first flat ball return spring 53 are arranged in the first flat ball hole 11, and a second flat ball 54 and a second flat ball return spring 55 are arranged in the second flat ball hole 12; the axis of the first flat ball hole 11 and the axis of the second flat ball hole 12 matched with the same group of marble assemblies 5 are on the same cross section and the angle between the two is α°; at least one of the plurality of groups of marble assemblies 5 further includes a supplementary bead 56 arranged between the first marble 51 and the first flat bead 52 or between the first marble 51 and the second flat bead 54;

[0044] When the supplementary bead 56 is located in the second flat bead hole 12 and the elastic bead hole 31 is aligned with the first flat bead hole 11, the lock core is in a non-nanny opening state, and the lock can be turned to unlock by inserting the master key 71, and cannot be turned to unlock by inserting the nanny key 72;

[0045] When the supplementary bead 56 is located in the marble hole 31 and the marble hole 31 is aligned with the first flat bead hole 11, the lock core is in a nanny-able openable state, and the master key 71 or the nanny key 72 can be inserted to turn and unlock;

[0046] When the lock core is in the non-nanny opening state, insert the main key 71 and rotate it toward the second flat bead hole 12 for α°, then pull out the supplementary bead 56 and enter the second flat bead hole 12 under the action of the second flat bead return spring 55. Then insert the conversion key 73 and rotate it toward the first flat bead hole 11 for α° to switch the lock core to the nanny opening state, at which time the supplementary bead 56 is switched to between the first marble 51 and the first flat bead 52;

[0047] When the lock core is in a nanny-openable state, insert the conversion key 73, rotate it α° toward the second flat bead hole 12 and then pull it out. At this time, the supplementary bead 56 is switched to between the first marble 51 and the second flat bead 54; when the main key 71 is inserted again, the supplementary bead 56 enters the second flat bead hole 12 and rotates α° toward the first flat bead hole 11, so that the lock core is switched to a non-nanny-openable state.

[0048] The position of the supplementary bead 56 is switched through the cooperation of the main key 71 and the conversion key 73, and then the lock state is switched to control whether the nanny can open the lock, so as to control the nanny's use time and solve the worry problem when changing the nanny, which is highly safe.

[0049] Furthermore, the switch from the non-nanny-enabled state to the nanny-enabled state is realized, and the attached Figure 4 To Attachment Fig.10 For explanation. Figure 4 The display shows the non-nanny open state (master state), attached Figure 5 The longitudinal cross-sectional view of the master key 71 is shown; Figure 6 The figure is a longitudinal cross-sectional view after the main key 71 is inserted and rotated toward the second flat bead hole 12 by α°, at which time the pin bead hole 31 is aligned with the second flat bead hole 12; Figure 7 After the master key is pulled out, the supplementary bead 56 enters the second flat bead hole 12 under the action of the second flat bead return spring 55; Figure 8 FIG. 1 is a longitudinal sectional view after the conversion key 73 is inserted, at which time the supplementary bead 56 is still in the second flat bead hole 12; Fig. 9 FIG. 1 is a longitudinal cross-sectional view of the first flat bead hole after the conversion key 73 is inserted and rotated α°, at which time the pinhole 31 is aligned with the first flat bead hole 11; Fig.10 The figure shows a longitudinal cross-sectional view of the state in which the nanny can open the lock. At this time, the conversion key 73 has been pulled out, and the master key 71, the nanny key 72, the conversion key 73 or the auxiliary key 74 can be inserted to rotate and unlock the lock.

[0050] In this embodiment, in order to prevent the nanny key 72 from switching the lock state when inserted, a limit mechanism 6 is further provided between the lock housing 1 and the outer lock core 3. Figure 3 and attached Figure 4As shown, the outer lock core 3 is provided with a keyhole 30 for inserting a key, and a limiting groove 32 for accommodating the limiting mechanism 6 is provided on the outer peripheral surface of the outer lock core 3, and a limiting hole 33 communicating with the keyhole 30 is provided at the bottom of the limiting groove 32, and the lock shell 1 is provided with an outer lock core hole 13 for accommodating the outer lock core 3, and a yield groove 10 is provided on the inner wall of the outer lock core hole 13 corresponding to the limiting groove 32; the limiting mechanism 6 includes a side marble 61 and a side marble return spring 62 assembled in the limiting groove 32, one end of the side marble 61 is convexly formed with an outer protrusion 611 extending into the yield groove 10, and one end of the side marble 61 is provided with an extending portion 612 that can pass through the side marble return spring 62 and the limiting hole 33 and extend into the keyhole 30; as shown in the attached Fig.18 and 20 As shown, the side end surfaces of the master key 71 and the conversion key 73 are both provided with an escape groove 75 corresponding to the insertion portion 612, and the front end of the escape groove 75 is an open structure. Fig.19 As shown, the side end surfaces of the nanny key 72 are provided with avoidance recesses 76 corresponding to the insertion portion 612; when the outer lock gall 3 is rotated, the inner wall of the outer lock gall hole 13 squeezes the outer protrusion 611 so that the insertion portion 612 is inserted into the keyhole 30, and the master key 71 and the conversion key 73 can be inserted into or pulled out of the keyhole 30, while the nanny key 72 cannot be inserted into or pulled out of the keyhole 30, because the avoidance groove 75 is an open structure and the avoidance recess 76 is not an open structure, so the master key 71 and the conversion key 73 can be inserted into or pulled out of the keyhole 30, while the nanny key 72 cannot be inserted into or pulled out of the keyhole 30, which also makes it possible for the outer lock gall 3 to rotate to the position shown in the attached figure. Figure 7 In the state shown, the nanny key 72 cannot be inserted into or removed from the keyhole 30, which effectively prevents the nanny from unlocking the door by switching the state of the nanny key 72, thereby achieving high safety performance.

[0051] When the marble hole 31 is aligned with the first flat bead hole 11, the convex portion 611 extends into the give way slot 10 under the action of the side marble return spring 62 and the protruding portion 612 exits the key hole 30, the master key 71, the nanny key 72 and the conversion key 73 can all be inserted into or pulled out of the key hole 30. In this embodiment, the side marble 61 is mushroom-shaped. More specifically, the side marble 61 includes a body 613, one end of the body 613 is the convex portion 611, the other end of the body 613 is the protruding portion 612, and the convex portion 611 is conical. A limiting portion 614 with a diameter larger than that of the extending portion 612 is also provided between the main body 613 and the extending portion 612, and the diameter of the limiting portion 614 is smaller than the diameter of the main body 613. The inner diameter of the side ball return spring 62 is larger than the diameter of the limiting portion 614, and the outer diameter of the side ball return spring 62 is smaller than the diameter of the main body 613. When the inner wall of the external locking hole 13 squeezes the external protrusion 611, the main body 613 also compresses the side ball return spring 62 and forms a space for accommodating the compressed side ball return spring 62 on the outer side of the limiting portion 614. The structure is simple and the design is ingenious.

[0052] In this embodiment, the axis of the first flat bead hole 11 and the axis of the second flat bead hole 12 intersect on the rotation center line of the outer lock core 3, so that when the outer lock core 3 rotates, it can ensure that the marble hole 31 can be aligned with the first flat bead hole 11 or the second flat bead hole 12. In this embodiment, the axis of the first flat bead hole 11 and the axis of the second flat bead hole 12 are on the same cross section and the angle between the two is α°. When the size of the lock shell 1 meets the requirements for installing the marble assembly 5, α° can be any angle, such as a lock shell with a larger and wider size. In this embodiment, the size of the lock shell used is smaller, and there is enough space at the upper ends of the outer lock core 3 and the inner lock core 4 to install the marble assembly 5. Therefore, the α is 30±5, and the α° in the attached figure of this embodiment is 30°.

[0053] In this embodiment, the teeth on the front of the nanny key 72 are the same as the teeth on the front of the conversion key 73. The difference is that the side of the nanny key 72 is an avoidance concave point 76, while the side of the conversion key 73 is an avoidance groove 75.

[0054] In this embodiment, in order to prevent family members (especially the elderly and children) from pulling out the main key 71 when the main key 71 is not rotated properly (the pinball hole 31 is not aligned with the first flat bead hole 11), the nanny lock also includes a secondary key 74. The secondary key 74 cannot switch the state of the nanny lock, but can unlock the lock in both the non-nanny opening state and the nanny opening state. Fig.21As shown, more specifically, the teeth on the front of the secondary key 74 are the same as the teeth on the front of the main key 71, and the side end of the secondary key 74 is provided with the avoidance concave point 76, so the secondary key 74 can only be pulled out or inserted when the (ball hole 31 is aligned with the first flat ball hole 11. When the outer lock gall 3 is rotated, the inner wall of the outer lock gall hole 13 squeezes the outer protrusion 611 so that the insertion portion 612 is inserted into the key hole 30, and the secondary key 74 cannot be inserted into or pulled out of the key hole 30; when the ball hole 31 is aligned with the first flat ball hole 11, the outer protrusion 611 is inserted into the give way groove 10 under the action of the side ball return spring 62, and the insertion portion 612 exits the key hole 30, the secondary key 74 can be inserted into or pulled out of the key hole 30.

[0055] In this embodiment, the lock shell 1 and the inner lock core 4 can be linked by other means without inserting a key, such as a knob structure, such as the knob structure disclosed in the unlocking and configuration control method of a key-inserting smart lock with a unique identity authentication ID disclosed by the applicant in the Chinese invention patent publication number CN110094113B. The lock shell 1 and the inner lock core 4 can also be matched by several groups of marble assemblies 5 distributed along the key insertion direction, and locked by the key; the marble assemblies 5 arranged between the lock shell 1 and the inner lock core 4 are distributed in the same direction as the marble assemblies 5 arranged between the lock shell 1 and the outer lock core 3; a limit mechanism 6 is also arranged between the lock shell 1 and the inner lock core 4, and the outer lock core 3 has the same structure as the inner lock core 4. For the convenience of users, the teeth on the front of the main key 71 are the same as those on the back, the teeth on the front of the nanny key 72 are the same as those on the back, the teeth on the front of the conversion key 73 are the same as those on the back, the teeth on the front of the secondary key 74 are the same as those on the back, and the structure between the lock shell 1 and the inner lock core 4 is also the same as the structure between the lock shell 1 and the outer lock core 3.

[0056] In this embodiment, as shown in the attached Figure 5 The figure shows a longitudinal cross-sectional view of the master key 71 inserted in the non-nanny unlocking state. At this time, the lock can be unlocked by turning it and the key can be pulled out after rotating α° toward the second flat bead hole 12; Fig.12 The figure shows a longitudinal cross-sectional view of the master key 71 inserted into the nanny's unlocking state. At this time, the lock can be unlocked by turning the lock and the key can be pulled out after rotating α° toward the second flat bead hole 12. Fig.13 The longitudinal cross-sectional view of the non-nanny unlocking state with the secondary key 74 inserted is shown. At this time, the lock can be turned to unlock, but the key cannot be removed after being rotated α° toward the second flat bead hole 12;

[0057] As attached Fig.14 The longitudinal cross-sectional view of the nanny inserting the secondary key 74 in the unlocking state is shown. At this time, the lock can be turned to unlock, but the key cannot be pulled out after rotating α° toward the second flat bead hole 12; Fig.15The longitudinal cross-sectional view of the non-nanny opening state with the conversion key 73 inserted is shown. At this time, the lock cannot be turned to unlock, but the key can be pulled out after rotating α° toward the second flat bead hole 12; Fig. 9 The figure shows a longitudinal cross-sectional view of the nanny inserting the conversion key 73 in the unlocking state, and the key can be pulled out after rotating α° toward the second flat bead hole 12; Fig.16 The longitudinal cross-sectional view of the non-nanny opening state in which the nanny key 72 is inserted is shown. At this time, the lock cannot be turned to unlock and the key cannot be pulled out after rotating α° toward the second flat bead hole 12; Fig.17 The longitudinal cross-sectional view is shown as a nanny key 72 inserted into the nanny's unlocking state. At this time, the lock can be turned to unlock, but the key cannot be pulled out after being rotated α° toward the second flat bead hole 12.

Claims

1. A nanny lock with high security, comprising a lock core and a master key (71) and a nanny key (72) adapted to the lock core, the lock core comprising a lock shell (1), a puller (2) arranged in an opening groove in the middle of the lock shell (1), and an outer lock core (3) and an inner lock core (4) arranged in the lock shell (1) and located on both sides of the puller (2), the lock shell (1) and the outer lock core (3) are matched by a plurality of marble assemblies (5) distributed along the key insertion direction, characterized in that It also includes a conversion key (73), the outer lock core (3) is provided with a marble hole (31), the lock housing (1) is provided with a first flat bead hole (11) and a second flat bead hole (12), each group of the marble assemblies (5) includes a first marble (51) arranged in the marble hole (31), a first flat bead (52) and a first flat bead return spring (53) arranged in the first flat bead hole (11), and a second flat bead (54) and a second flat bead return spring (55) arranged in the second flat bead hole (12); the axis of the first flat bead hole (11) and the axis of the second flat bead hole (12) matched with the same group of marble assemblies (5) are on the same cross section and the angle between the two is α°; at least one of the plurality of groups of marble assemblies (5) further includes a supplementary bead (56) arranged between the first marble (51) and the first flat bead (52) or between the first marble (51) and the second flat bead (54); When the supplementary bead (56) is located in the second flat bead hole (12) and the pinhole (31) is aligned with the first flat bead hole (11), the lock core is in a non-nanny opening state, and can be turned to unlock by inserting a master key (71), but cannot be turned to unlock by inserting a nanny key (72); When the supplementary bead (56) is located in the marble hole (31) and the marble hole (31) is aligned with the first flat bead hole (11), the lock core is in a state where it can be opened by a nanny, and the lock can be opened by inserting a master key (71) or a nanny key (72); When the lock core is in a non-nanny-opening state, a master key (71) is inserted and rotated toward the second flat bead hole (12) for α° and then pulled out, and then a conversion key (73) is inserted and rotated toward the first flat bead hole (11) for α° so that the lock core is switched to a nanny-opening state; When the lock core is in a nanny-openable state, a conversion key (73) is inserted and rotated toward the second flat bead hole (12) by α° and then pulled out, and then a master key (71) is inserted and rotated toward the first flat bead hole (11) by α° so that the lock core is switched to a non-nanny-openable state.

2. The high-security nanny lock according to claim 1 is characterized in that When the lock core is in a non-nanny open state, a master key (71) is inserted and rotated toward the second flat bead hole (12) by α°, and then the supplementary bead (56) is pulled out and enters the second flat bead hole (12) under the action of the second flat bead return spring (55).

3. The high-security nanny lock according to claim 2 is characterized in that A limiting mechanism (6) is further provided between the lock housing (1) and the outer lock core (3); the outer lock core (3) is provided with a keyhole (30) for inserting a key; a limiting groove (32) for accommodating the limiting mechanism (6) is provided on the outer peripheral surface of the outer lock core (3); a limiting hole (33) communicating with the keyhole (30) is provided at the bottom of the limiting groove (32); the lock housing (1) is provided with an outer lock core hole (13) for accommodating the outer lock core (3); and the inner wall of the outer lock core hole (13) is provided with a locking member (13) for accommodating the outer lock core (3). A clearance groove (10) is provided corresponding to the limiting groove (32); the limiting mechanism (6) comprises a side marble (61) and a side marble return spring (62) assembled in the limiting groove (32); one end of the side marble (61) is convexly formed with an outer protrusion (611) extending into the clearance groove (10); one end of the side marble (61) is provided with an insertion portion (612) capable of passing through the side marble return spring (62) and the limiting hole (33) and extending into the keyhole (30); The side end surfaces of the master key (71) and the conversion key (73) are both provided with avoidance grooves (75) corresponding to the insertion portion (612), the front end of the avoidance grooves (75) is an open structure, and the side end surfaces of the nanny key (72) are both provided with avoidance concave points (76) corresponding to the insertion portion (612); when the outer lock gallbladder (3) is rotated, the inner wall of the outer lock gallbladder hole (13) presses the outer protrusion (611) so that the insertion portion (612) is inserted into the key hole (30), and the master key (71 ) and the conversion key (73) can all be inserted into or pulled out of the keyhole (30), while the nanny key (72) cannot be inserted into or pulled out of the keyhole (30); when the marble hole (31) and the first flat bead hole (11) are aligned with each other, the outer protrusion (611) extends into the clearance groove (10) under the action of the side marble return spring (62) and the insertion portion (612) exits the keyhole (30), the master key (71), the nanny key (72) and the conversion key (73) can all be inserted into or pulled out of the keyhole (30).

4. The high-security nanny lock according to claim 3 is characterized in that The side marbles (61) are mushroom-shaped.

5. The high-security nanny lock according to claim 3 is characterized in that The axis of the first flat bead hole (11) and the axis of the second flat bead hole (12) intersect on the rotation center line of the outer locking liner (3).

6. The high-security nanny lock according to claim 5, characterized in that The α is 30±5.

7. The high-security nanny lock according to claim 3, characterized in that The teeth on the front side of the nanny key (72) are the same as the teeth on the front side of the conversion key (73).

8. The high-security nanny lock according to any one of claims 3 to 7, characterized in that It also includes a secondary key (74), the teeth on the front of the secondary key (74) are the same as the teeth on the front of the main key (71), and the side end of the secondary key (74) is provided with the avoidance recess (76); when the outer lock core (3) is rotated, the inner wall of the outer lock core hole (13) squeezes the outer protrusion (611) so that the insertion portion (612) is inserted into the key hole (30), and the secondary key (74) cannot be inserted into or removed from the key hole (30); when the ball hole (31) and the first flat ball hole (11) are relatively aligned, the outer protrusion (611) is inserted into the clearance groove (10) under the action of the side ball return spring (62) and the insertion portion (612) exits the key hole (30), the secondary key (74) can be inserted into or removed from the key hole (30).

9. The high-security nanny lock according to any one of claims 3 to 7, characterized in that The lock shell (1) and the inner lock core (4) are also matched by means of a plurality of groups of marble assemblies (5) distributed along the key insertion direction; the marble assemblies (5) arranged between the lock shell (1) and the inner lock core (4) are distributed in the same manner as the marble assemblies (5) arranged between the lock shell (1) and the outer lock core (3) along the key insertion direction; a limiting mechanism (6) is also arranged between the lock shell (1) and the inner lock core (4), and the outer lock core (3) and the inner lock core (4) have the same structure.

10. The high-security nanny lock according to claim 8, characterized in that The lock shell (1) and the inner lock core (4) are also matched with each other through a plurality of groups of marble assemblies (5) distributed along the key insertion direction; the marble assemblies (5) arranged between the lock shell (1) and the inner lock core (4) and the marble assemblies (5) arranged between the lock shell (1) and the outer lock core (3) are identical in distribution and structure along the key insertion direction; a limiting mechanism (6) is also arranged between the lock shell (1) and the inner lock core (4), and the outer lock core (3) and the inner lock core (4) have the same or similar structure.

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