Protective mechanism for electronic lock

By designing a protective mechanism, the mounting plate is driven to slide to open the closure of the keyboard and fingerprint disc, and use a brush and cleaning sponge to clean up debris and fingerprints, solving the problem of easy damage and cracking of the keyboard and fingerprint disc of the electronic password lock, improving safety and reliability.

CN119641167AInactive Publication Date: 2025-03-18JIANGSU HONGSHENG ELECTRONIC TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202411927080.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-25
Publication Date
2025-03-18
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

The touch screen of the existing electronic password lock is exposed for a long time by pressing the keyboard and fingerprint disc, which is easy to wear and damage, and is easily cracked by other people through fingerprints.

Method used

A protective mechanism is designed to drive the mounting plate to slide upward in the installation slot through the protective plate, open the closure of the keyboard and fingerprint disc, and clean the debris and fingerprints on the keyboard and fingerprint disc through a brush and a cleaning sponge.

Benefits of technology

It effectively protects the keyboard and fingerprint disc to prevent wear and damage, and cleans up fingerprint residues, improving the safety and reliability of electronic locks.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention relates to the technical field of electronic locks, in particular to a protection mechanism for an electronic lock, which comprises a protection plate, a first mounting groove and a second mounting groove are formed in the bottom of the protection plate, and insertion grooves are simultaneously formed in the bottoms of the inner sides of the first mounting groove and the second mounting groove; clamping grooves are simultaneously formed in the middle parts of the tops of the first mounting groove and the second mounting groove; the protection mechanism for the electronic lock has the beneficial effects that when an electronic lock body needs to be unlocked through a keyboard and a fingerprint disk, an upward protection plate is shifted in the direction pointed by first pointing lines on the surface of the protection plate, so that the protection plate drives a mounting plate to slide upwards in a mounting groove, and then the electronic lock body is unlocked; when a first telescopic groove formed in the bottom of the mounting plate is aligned with a limiting slot formed in the inner side of the top of the mounting groove of the electronic lock body, the limiting block is ejected into the limiting slot from the first telescopic groove through the tension of the first spring, the mounting plate is fixed in a sliding mode, and the mounting plate is prevented from being disengaged from the top of the mounting groove.
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Description

Technical Field

[0001] The invention relates to the technical field of electronic locks, and in particular to a protection mechanism for electronic locks. Background Art

[0002] An electronic combination lock is an electronic product that controls the operation of a circuit or chip (access control system) through password input, thereby controlling the closure of a mechanical switch to complete the task of unlocking and locking. There are many types of electronic combination locks, including simple circuit products and cost-effective chip-based products. The most widely used electronic combination locks are based on chips and are implemented through programming. In the field of security technology prevention, electronic combination locks with anti-theft alarm functions replace traditional mechanical combination locks, overcoming the shortcomings of mechanical combination locks with fewer passwords and poor security performance, greatly improving combination locks both in technology and performance.

[0003] In the prior art, the touch screen keypad and fingerprint plate of the electronic password lock are mostly exposed on the outside. If the keypad and fingerprint plate are exposed on the outside for a long time, they will cause wear and tear. If they are hit by other objects, they will be easily damaged. In addition, a large number of fingerprints will be attached to the surface of the keypad and fingerprint plate after long-term use, making the surface dirty and messy. Other people can easily crack the electronic lock quickly through the fingerprints on the buttons. Summary of the invention

[0004] The object of the present invention is to provide a protection mechanism for an electronic lock to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a protective plate, a first mounting groove and a second mounting groove are provided at the bottom of the protective plate, a plug-in groove is provided at the inner bottom of the first mounting groove and the second mounting groove, and a clamping groove is provided at the top middle of the first mounting groove and the second mounting groove; a plug-in plate is provided at the bottom of the first mounting plate and the second mounting plate, a second telescopic groove is provided at the top middle of the first mounting plate and the second mounting plate, a second spring is provided in the second telescopic groove, the top of the second spring is connected to the telescopic plate, and a fixed plug-in plate is provided at the top middle of the telescopic plate; and an electronic lock body, a keypad is provided on the surface of the electronic lock body, a mounting frame is provided around the keypad of the electronic lock body, and mounting grooves are provided on both sides of the mounting frame.

[0006] Preferably, a keypad is provided on the top of the surface of the electronic lock body, and a fingerprint disk is provided at the bottom of the keypad. The electronic lock body can be opened by pressing the keypad and the fingerprint disk. A handle is provided on the bottom surface of the electronic lock body, and the lock tongue can be retracted into the electronic lock body by turning the handle.

[0007] Preferably, mounting plates are provided on both sides of the protective plate, and the mounting plates are clamped in mounting grooves opened on both sides of the mounting frame. Clamping plates are provided at both ends of the inner side of the front end of the mounting groove. Clamping grooves are opened on both sides of the mounting plate, and the clamping plates are inserted into the clamping grooves to clamp the mounting plate in the mounting groove to prevent the mounting plate from falling off the mounting groove.

[0008] Preferably, the surface of the protective plate is provided with a first directional pattern. By moving the protective plate in the direction of the first directional pattern, the protective plate can drive the mounting plate to slide upward in the mounting groove, thereby exposing the keypad and fingerprint plate on the surface of the electronic lock body and opening the closure of the keypad and fingerprint plate.

[0009] Preferably, a first telescopic groove is provided at the inner bottom of the mounting plate, a first spring is arranged in the first telescopic groove, the outer side of the first spring is connected to a limit block, and a limit slot is provided at the inner side of the top end of the mounting groove of the electronic lock body. When the bottom of the mounting plate slides to the top end of the mounting groove, the first spring can pop the limit block out of the first telescopic groove through tension and insert it into the limit slot, thereby limiting the mounting plate and preventing the mounting plate from falling off from the mounting groove.

[0010] Preferably, the outer surfaces of the telescopic plates arranged on the tops of the first mounting plate and the second mounting plate are provided with connecting blocks at the same time, the connecting blocks extend from the second spring, the outer side of the connecting block is connected to the toggle plate, the inner side of the toggle plate is in close contact with the surface of the protective plate, and the surface of the toggle plate is provided with second directional patterns, and by toggling the toggle plate in the direction indicated by the second directional patterns, the toggle plate can drive the fixed plug plate on the top of the telescopic plate to retract into the second telescopic groove through the connecting block.

[0011] Preferably, plug-in plates are provided at the bottom of the first mounting plate and the second mounting plate at the same time, and the first mounting plate and the second mounting plate can be respectively installed in the first mounting groove and the second mounting groove by tilting. At the same time, the telescopic plate in the middle of the first mounting plate and the second mounting plate can bounce the fixed plug-in plate at the top of the telescopic plate into the clamping groove through tension, thereby fixing the first mounting plate and the second mounting plate in the first mounting groove and the second mounting groove respectively.

[0012] Preferably, a brush is provided on the inner surface of the first mounting plate, and the brush can be in close contact with the keypad and fingerprint plate provided on the surface of the electronic lock body. When the protective plate slides upward, the brush can clean the keypad and fingerprint plate and sweep away the debris stuck on the surface of the keypad and fingerprint plate.

[0013] Preferably, a cleaning block is provided on the inner surface of the second mounting plate. The cleaning block is a cleaning sponge. The cleaning block can be in close contact with the surface of the keypad and the fingerprint plate. When the protective plate slides upward, the cleaning block can clean the fingerprints adhered to the surface of the keypad and the fingerprint plate.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The present invention provides a protective mechanism for an electronic lock. When it is necessary to unlock the electronic lock body by pressing a keyboard and a fingerprint disk, the upward protective plate is first toggled in the direction of the first pointing pattern on the surface of the protective plate, so that the protective plate drives the mounting plate to slide upward in the mounting groove. When the first telescopic groove provided at the bottom of the mounting plate is aligned with the limiting slot provided at the inner side of the top of the mounting groove of the electronic lock body, the limiting block is ejected from the first telescopic groove into the limiting slot by the tension of the first spring, fixing the sliding of the mounting plate to prevent the mounting plate from detaching from the top of the mounting groove, and fixing the sliding of the protective plate connected to the mounting plate. At this time, the keyboard and the fingerprint disk on the surface of the electronic lock body leak out, so that the operator can unlock the electronic lock body by pressing the keyboard and the fingerprint disk; when the protective plate slides upward, the protective plate simultaneously drives the first mounting plate to slide upward, and the protective plate drives the first mounting plate to slide upward. The first mounting plate and the second mounting plate in the slot and the second mounting slot move upward synchronously, so that the cleaning blocks and the brushes arranged on the inner sides of the first mounting plate and the second mounting plate start to clean the keypad and the keypad, and clean the fingerprint impurities on the keypad and the fingerprint plate to prevent fingerprints from remaining on the keypad, causing other people to quickly decipher the password through fingerprints; when the unlocking is completed, the protective plate is moved downward by pushing the protective plate downward. At this time, the mounting plate drives the limit block and the limit slot to be squeezed, and the limit block is squeezed into the first telescopic slot through the arc surface arranged at the bottom, and the limit on the mounting plate is cancelled, so that the mounting plate and the protective plate can slide downward. While the protective plate slides downward, the cleaning blocks and the brushes on the inner sides of the first mounting plate and the second mounting plate clean the keypad and the fingerprint plate again, and clean the fingerprints on the keypad and the fingerprint plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0017] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention;

[0018] Figure 3 It is a schematic diagram of the cross-sectional structure of the installation groove of the present invention;

[0019] Figure 4 for Figure 3 A schematic diagram of the structure enlargement in the middle;

[0020] Figure 5 This is a schematic diagram of the three-dimensional structure of the electronic lock surface of the present invention;

[0021] Figure 6 It is another cross-sectional structural schematic diagram of the present invention;

[0022] Figure 7 for Figure 6 A magnified schematic diagram of the structure at B in the middle;

[0023] Figure 8 It is a schematic diagram of the three-dimensional structure of the protective plate of the present invention;

[0024] Fig. 9 It is a schematic diagram of the three-dimensional structure of the second mounting plate of the present invention.

[0025] In the figure: electronic lock body 1, handle 2, mounting frame 3, protective plate 4, first directional pattern 5, mounting slot 6, mounting plate 7, holding slot 8, holding plate 9, first telescopic slot 10, first spring 11, limit block 12, limit slot 13, keypad 14, fingerprint disk 15, first mounting slot 16, second mounting slot 17, first mounting plate 18, second mounting plate 19, cleaning block 20, brush 21, plug-in slot 22, holding slot 23, plug-in plate 24, second telescopic slot 25, second spring 26, telescopic plate 27, fixed plug-in plate 28, toggle plate 29, second directional pattern 30. DETAILED DESCRIPTION

[0026] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figures 1 to 9The present invention provides a technical solution: a protective plate 4, a first mounting groove 16 and a second mounting groove 17 are provided at the bottom of the protective plate 4, a plug-in groove 22 is provided at the inner bottom of the first mounting groove 16 and the second mounting groove 17, and a clamping groove 23 is provided at the top middle of the first mounting groove 16 and the second mounting groove 17; a plug-in plate 24 is provided at the bottom of the first mounting plate 18 and the second mounting plate 19, a second telescopic groove 25 is provided at the top middle of the first mounting plate 18 and the second mounting plate 19, a second spring 26 is provided in the second telescopic groove 25, the top of the second spring 26 is connected to the telescopic plate 27, and a fixed plug-in plate 28 is provided at the top middle of the telescopic plate 27; and an electronic lock body 1, an electronic lock body 1 The surface of the electronic lock body 1 is provided with a keypad 14, and a mounting frame 3 is provided around the keypad 14 of the electronic lock body 1, and mounting grooves 6 are provided on both sides of the mounting frame 3; a keypad 14 is provided on the top of the surface of the electronic lock body 1, and a fingerprint plate 15 is provided at the bottom of the keypad 14 of the electronic lock body 1, and the electronic lock body 1 can be opened by pressing the keypad 14 and the fingerprint plate 15, and a handle 2 is provided on the bottom surface of the electronic lock body 1, and the lock tongue can be retracted into the electronic lock body 1 by turning the handle 2; mounting plates 7 are provided on both sides of the protective plate 4, and the mounting plates 7 are clamped in the mounting grooves 6 opened on both sides of the mounting frame 3, and the inner ends of the front end of the mounting groove 6 are provided with clamping plates 9, and clamping grooves 8 are provided on both sides of the mounting plate 7, and the clamping plates 9 are plugged into the card The mounting plate 7 is clamped in the mounting groove 6 in the holding groove 8 to prevent the mounting plate 7 from falling off from the mounting groove 6; the surface of the protective plate 4 is provided with a first directional pattern 5, and the protective plate 4 can be moved in the direction indicated by the first directional pattern 5, so that the protective plate 4 can drive the mounting plate 7 to slide upward in the mounting groove 6, and the keypad 14 and the fingerprint plate 15 on the surface of the electronic lock body 1 are leaked, and the closure of the keypad 14 and the fingerprint plate 15 is opened; a first telescopic groove 10 is provided at the bottom inner side of the mounting plate 7, and a first spring 11 is provided in the first telescopic groove 10, and the outer side of the first spring 11 is connected to the limit block 12, and the electronic lock body 1 is provided with a limited slot 13 on the inner side of the top of the mounting groove 6, when the bottom of the mounting plate 7 slides to the top of the mounting groove 6 When the first end is moved, the first spring 11 can pop out the limit block 12 from the first telescopic groove 10 through tension, insert it into the limit slot 13, limit the mounting plate 7, and prevent the mounting plate 7 from falling off the mounting groove 6; the outer surface of the telescopic plate 27 arranged on the top of the first mounting plate 18 and the second mounting plate 19 is also provided with a connecting block, the connecting block extends from the second spring 26, the outer side of the connecting block is connected to the toggle plate 29, the inner side of the toggle plate 29 is closely attached to the surface of the protective plate 4, and the surface of the toggle plate 29 is provided with a second directional pattern 30. By toggling the toggle plate 29 in the direction pointed by the second directional pattern 30, the toggle plate 29 can drive the fixed plug plate 28 on the top of the telescopic plate 27 to retract into the second telescopic groove 25 through the connecting block;The first mounting plate 18 and the second mounting plate 19 are provided with a plug-in plate 24 at the bottom. The first mounting plate 18 and the second mounting plate 19 can be installed in the first mounting groove 16 and the second mounting groove 17 respectively by tilting. At the same time, the telescopic plate 27 in the middle of the first mounting plate 18 and the second mounting plate 19 can bounce the fixed plug-in plate 28 at the top of the telescopic plate 27 into the clamping groove 23 through tension, so as to fix the first mounting plate 18 and the second mounting plate 19 in the first mounting groove 16 and the second mounting groove 17 respectively; the inner surface of the first mounting plate 18 is provided with a brush 21, the brush 21 can be in close contact with the keypad 14 and the fingerprint plate 15 arranged on the surface of the electronic lock body 1, when the protective plate 4 slides upward, the brush 21 can clean the keypad 14 and the fingerprint plate 15, and sweep away the debris stuck on the surface of the keypad 14 and the fingerprint plate 15; the inner surface of the second mounting plate 19 is provided with a cleaning block 20, the cleaning block 20 is a cleaning sponge, the cleaning block 20 can be in close contact with the surface of the keypad 14 and the fingerprint plate 15, when the protective plate 4 slides upward, the cleaning block 20 can clean the fingerprints stuck on the surface of the keypad 14 and the fingerprint plate 15.;

[0028] In actual use, when it is necessary to unlock the electronic lock body 1 by pressing the keyboard 14 and the fingerprint plate 15, the upward protective plate 4 is first moved in the direction of the first pointing pattern 5 on the surface of the protective plate 4, so that the protective plate 4 drives the mounting plate 7 to slide upward in the mounting groove 6. When the first telescopic groove 10 provided at the bottom of the mounting plate 7 is aligned with the limiting slot 13 provided on the inner side of the top of the mounting groove 6 of the electronic lock body 1, the limiting block 12 is ejected from the first telescopic groove 10 into the limiting slot 13 by the tension of the first spring 11, and the sliding of the mounting plate 7 is fixed to prevent the mounting plate 7 from detaching from the top of the mounting groove 6, and at the same time, the protective plate 4 connected to the mounting plate 7 is fixed. The keypad 14 and the fingerprint plate 15 on the surface of the electronic lock body 1 are exposed, so that the operator can unlock the electronic lock body 1 by pressing the keypad 14 and the fingerprint plate 15; when the protective plate 4 slides upward, the protective plate 4 simultaneously drives the first mounting groove 16 and the first mounting groove 17 in the first mounting groove 18 and the second mounting plate 19 to move upward synchronously, so that the cleaning block 20 and the brush 21 arranged on the inner side of the first mounting plate 18 and the inner side of the second mounting plate 19 start to clean the keypad 14 and the keypad 14, and clean the fingerprint impurities on the keypad 14 and the fingerprint plate 15 to prevent fingerprints from remaining on the keypad 14, which will cause the fingerprint impurities to be removed. Other personnel can quickly decipher the password by fingerprint; when the unlocking is completed, the protective plate 4 is pushed downward to move the protective plate 4 downward, and the mounting plate 7 drives the limit block 12 and the limit slot 13 to be squeezed, and the limit block 12 is squeezed into the first telescopic slot 10 through the arc surface set at the bottom, and the limit of the mounting plate 7 is cancelled, so that the mounting plate 7 and the protective plate 4 can slide downward. While the protective plate 4 slides downward, the cleaning block 20 and the brush 21 on the inner side of the first mounting plate 18 and the second mounting plate 19 clean the keypad 14 and the fingerprint plate 15 again, and clean the fingerprints on the keypad 14 and the fingerprint plate 15; when the first mounting plate 18 and the second mounting plate 19 are After the cleaning block 20 and the brush 21 on the inner side of the plate 19 have been used for a period of time, the toggle plate 29 is pushed downward in the direction of the second directional pattern 30 in the middle of the surface of the first mounting plate 18 and the second mounting plate 19, so that 29 drives the telescopic plate 27 to squeeze the second spring 26 through the connecting block, so that the telescopic plate 27 drives the fixed plug plate 28 to fall off from the holding groove 23, and the fixation of the first mounting plate 18 and the second mounting plate 19 is cancelled. Then, the first mounting plate 18 and the second mounting plate 19 are tilted and taken out, and the cleaning block 20 and the brush 21 on the inner side of the first mounting plate 18 and the second mounting plate 19 can be cleaned, and they can be reinstalled after cleaning.

[0029] Although the above describes the illustrative specific implementation methods of the present application so that technicians in this technical field can understand the present application, the present application is not limited to the scope of the specific implementation methods. For ordinary technicians in this technical field, as long as various changes are within the spirit and scope of the present application defined and determined by the attached claims, all application creations using the concept of the present application are protected.

Claims

1. A protective mechanism for an electronic lock, characterized in that: include: A protective plate (4), wherein a first mounting groove (16) and a second mounting groove (17) are provided at the bottom of the protective plate (4), a plug-in groove (22) is provided at the inner bottom of the first mounting groove (16) and the second mounting groove (17), and a clamping groove (23) is provided at the middle of the top of the first mounting groove (16) and the second mounting groove (17); The bottoms of the first mounting plate (18) and the second mounting plate (19) are provided with a plug-in plate (24), the middle parts of the tops of the first mounting plate (18) and the second mounting plate (19) are provided with a second telescopic groove (25), a second spring (26) is provided in the second telescopic groove (25), the top of the second spring (26) is connected to the telescopic plate (27), and a fixed plug-in plate (28) is provided in the middle part of the top of the telescopic plate (27); and An electronic lock body (1) is provided with a keypad (14) on the surface of the electronic lock body (1), a mounting frame (3) is provided around the keypad (14) of the electronic lock body (1), and mounting grooves (6) are provided on both sides of the mounting frame (3).

2. A protective mechanism for an electronic lock according to claim 1, characterized in that: The top of the surface of the electronic lock body (1) is provided with a keypad (14), and the bottom of the keypad (14) is provided with a fingerprint plate (15). The electronic lock body (1) can be opened by pressing the keypad (14) and the fingerprint plate (15). The bottom surface of the electronic lock body (1) is provided with a handle (2), and the lock tongue can be retracted into the electronic lock body (1) by turning the handle (2).

3. A protective mechanism for an electronic lock according to claim 2, characterized in that: Mounting plates (7) are provided on both sides of the protection plate (4), and the mounting plates (7) are clamped in mounting grooves (6) provided on both sides of the mounting frame (3). Clamping plates (9) are provided at both ends of the inner side of the front end of the mounting groove (6). Clamping grooves (8) are provided on both sides of the mounting plate (7), and the clamping plates (9) are inserted into the clamping grooves (8) to clamp the mounting plate (7) in the mounting groove (6) to prevent the mounting plate (7) from falling off from the mounting groove (6).

4. A protective mechanism for an electronic lock according to claim 3, characterized in that: The surface of the protection plate (4) is provided with a first directional pattern (5), and by moving the protection plate (4) in the direction pointed by the first directional pattern (5), the protection plate (4) can drive the mounting plate (7) to slide upward in the mounting groove (6), thereby leaking a keypad (14) and a fingerprint plate (15) on the surface of the electronic lock body (1), thereby opening the closure of the keypad (14) and the fingerprint plate (15).

5. A protective mechanism for an electronic lock according to claim 4, characterized in that: The inner bottom of the mounting plate (7) is provided with a first telescopic groove (10), a first spring (11) is arranged in the first telescopic groove (10), the outer side of the first spring (11) is connected to a limit block (12), and the electronic lock body (1) is provided with a limit slot (13) on the inner side of the top end of the mounting groove (6). When the bottom of the mounting plate (7) slides to the top end of the mounting groove (6), the first spring (11) can pop the limit block (12) out of the first telescopic groove (10) through tension, and insert it into the limit slot (13), thereby limiting the mounting plate (7) and preventing the mounting plate (7) from falling off from the mounting groove (6).

6. A protective mechanism for an electronic lock according to claim 5, characterized in that: The outer surfaces of the telescopic plates (27) arranged on the tops of the first mounting plate (18) and the second mounting plate (19) are provided with connecting blocks at the same time. The connecting blocks extend from the second spring (26). The outer side of the connecting block is connected to a toggle plate (29). The inner side of the toggle plate (29) is in close contact with the surface of the protective plate (4). The surface of the toggle plate (29) is provided with a second directional pattern (30). By toggling the toggle plate (29) in the direction indicated by the second directional pattern (30), the toggle plate (29) can drive the fixed plug plate (28) on the top of the telescopic plate (27) to retract into the second telescopic groove (25) through the connecting block.

7. A protective mechanism for an electronic lock according to claim 6, characterized in that: The bottom of the first mounting plate (18) and the bottom of the second mounting plate (19) are provided with a plug-in plate (24), and the first mounting plate (18) and the second mounting plate (19) can be respectively installed in the first mounting groove (16) and the second mounting groove (17) by tilting. At the same time, the telescopic plate (27) in the middle of the first mounting plate (18) and the second mounting plate (19) can spring the fixed plug-in plate (28) at the top of the telescopic plate (27) into the clamping groove (23) through tension, so that the first mounting plate (18) and the second mounting plate (19) are respectively fixed in the first mounting groove (16) and the second mounting groove (17).

8. A protective mechanism for an electronic lock according to claim 7, characterized in that: The inner surface of the first mounting plate (18) is provided with a brush (21), and the brush (21) can be closely attached to a keypad (14) and a fingerprint plate (15) arranged on the surface of the electronic lock body (1). When the protective plate (4) slides upward, the brush (21) can clean the keypad (14) and the fingerprint plate (15), and sweep away the sundries stuck on the surface of the keypad (14) and the fingerprint plate (15).

9. A protective mechanism for an electronic lock according to claim 8, characterized in that: A cleaning block (20) is provided on the inner surface of the second mounting plate (19). The cleaning block (20) is a cleaning sponge. The cleaning block (20) can be closely attached to the surface of the keypad (14) and the fingerprint plate (15). When the protective plate (4) slides upward, the cleaning block (20) can clean the fingerprints adhered to the surface of the keypad (14) and the fingerprint plate (15).