Cabinet door lock and usage method

Abstract

The present invention discloses a cabinet door lock and a method for use. The cabinet door lock comprises a base, a cover, a locking assembly, and a roller. One end of the cover is hinged to the base, and the roller is hinged to the other end of the cover. The locking assembly is located on the cover and hinged to the cover, and snaps into place with the base. The cabinet door compression margin can be adjusted on the base, and the locking margin can be adjusted on the cover. When the cabinet door lock disclosed by the present invention is used, there is no need to drill holes in the cabinet door, which can improve the sealing of the cabinet body.

Description

Technical Field

[0001] The present invention relates to the technical field of cabinet door locks, and in particular to a cabinet door lock and a use method thereof. Background Art

[0002] Cabinet doors are often found in distribution boxes or large shelters. Door locks are commonly used to secure these doors. These locks are typically fixed to the cabinet door and require corresponding mounting holes. These locks are typically equipped with a dedicated key or a rotary mechanism for opening the door. The wedge-shaped structure of the lock tongue allows for compression and positioning of the door.

[0003] Because common cabinet door locks need to be installed on the cabinet door, they generally require holes to be opened in the corresponding locations for fastening. However, as the environmental adaptability requirements (electromagnetic compatibility, sealing, rainproofing, etc.) of electronic equipment become increasingly stringent, the sealing effect of these locks cannot effectively meet these requirements, resulting in increasingly complex lock structures and higher costs. These locks also require a dedicated key to open, and sometimes the key is lost or omitted, which can also lead to problems such as low work efficiency. Furthermore, these locks have limited locking and clamping functions, making it difficult to ensure a good locking and sealing effect when installed on cabinet doors with high mass and resistance.

[0004] In the prior art, the invention patent with patent publication number CN101078324A discloses an automatic cabinet door buckle, including a lock body, the lock body including a shell, a two-section lock tongue arranged in the shell, the two-section lock tongue including a lock tongue and a lock shaft, the front end of the lock tongue has a bevel, and the rear end of the lock tongue is provided with a slot, the front end of the lock shaft is inserted into the slot, and the lock tongue is also provided with an anti-drop buckle on the slot port to prevent the lock shaft from falling out of the slot, the front end of the lock shaft is provided with a fastener matching the anti-drop buckle, the rear end of the lock shaft is provided with a first return spring, the front end of the fastener of the lock shaft in the slot of the lock tongue is provided with a second return spring, the lock shaft is also provided with an oblique groove, and the shell above the oblique groove is provided with a through hole; the shell is also equipped with a button and a lock slot component, wherein the button includes a shell and a button, the lower end of the button is provided with an insertion rod matching the oblique groove, and the lower end of the insertion rod is arranged obliquely, but it is also necessary to drill a hole on the cabinet door. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to solve the problem that existing cabinet door locks need to be fixed by opening holes on the cabinet door, which reduces the sealing effect of the electronic cabinet.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A cabinet door lock includes a base 100, a cover 200, a locking assembly 300 and a roller 400; one end of the cover 200 is hinged to the base 100, and the roller 400 is hinged to the other end of the cover 200; the locking assembly 300 is located on the cover 200 and is hinged to the cover 200, and is snapped with the base 100, and can adjust the cabinet door compression margin on the base 100, and adjust the locking margin on the cover 200.

[0008] Advantages: When securing and locking power distribution equipment or shelter doors, this lock allows for quick and effective locking and compression without drilling holes in the door. It also offers a wide range of compression adjustments, ensuring reliable sealing and significantly improving door opening efficiency. Its simple, purely mechanical structure further enhances reliability.

[0009] In one embodiment of the present invention, the locking assembly 300 includes a first lock buckle 310 and a second lock buckle 320 ; the first lock buckle 310 is hinged to the blocking cover 200 , and both ends of the second lock buckle 320 are hinged to the first lock buckle 310 .

[0010] In one embodiment of the present invention, the non-connected edge on the base 100 away from the roller 400 is a beveled edge, and a wavy slot 121 is provided on the non-connected edge; the second lock buckle 320 is engaged in the slot 121 and can adjust the engagement position in the slot 121.

[0011] In one embodiment of the present invention, when the second lock buckle 320 is placed on the base 100 and is in the slot 121 closest to the hinge point of the base 100 and the cover 200, the roller 400 is farthest from the cabinet door, which is recorded as the farthest distance L1; when the second lock buckle 320 is placed on the base 100 and is farthest from the hinge point of the base 100 and the cover 200, the roller 400 is closest to the cabinet door, which is recorded as the closest distance L2; then the cabinet door compression margin is: L1+L2.

[0012] In one embodiment of the present invention, when the locking assembly 300 is locked, the first lock buckle 310 is pushed, and the hinge point of the base 100 and the blocking cover 200 is recorded as point A, the position of the second lock buckle 320 in the slot 121 is recorded as point B, the hinge point of the first lock buckle 310 and the blocking cover 200 is recorded as point C; the hinge point of the second lock buckle 320 and the first lock buckle 310 is recorded as point D; the first lock buckle 310 is pushed to rotate the first lock buckle 310 around point C. When the line AC between point A and point C is collinear with the line CD between point C and point D, the cabinet door lock is in a stable state.

[0013] In one embodiment of the present invention, the first lock buckle 310 is continuously pushed so that the first lock buckle 310 rotates around point C in the direction of fitting the blocking cover 200, deflecting by an angle β, and point D is offset to point D'. At this time, the first lock buckle 310 fits the blocking cover 200, and the locking assembly 300 is self-locking.

[0014] In one embodiment of the present invention, the base 100 includes a mounting bottom surface 110, and a first side surface 120, a second side surface 130, and a third side surface 140 extending in the same direction perpendicularly along three sides of the mounting bottom surface 110; the third side surface 140 is located between the first side surface 120 and the second side surface 130; the slot 121 is provided on the first side surface 120; and the second side surface 130 is symmetrically arranged with respect to the first side surface 120.

[0015] The third side surface 140 is lower in height than the first side surface 120 and the second side surface 130 , so that lugs 123 are formed on both the first side surface 120 and the second side surface 130 , and first mounting holes 124 are provided on the lugs 123 .

[0016] In one embodiment of the present invention, the barrier cover 200 includes a first middle plate 210 and first and second connecting arms 220 and 230 fixedly connected on both sides of the first middle plate 210; the first and second connecting arms 220 and 230 extend beyond the first middle plate 210 to form an accommodating space 2123; and a second mounting hole 221, a third mounting hole 222, and a fourth mounting hole 223 are sequentially provided on the first and second connecting arms 220 and 230, which are coaxial. The roller 400 is located in the accommodating space 2123 and is hingedly connected to the first and second connecting arms 220 and 230 through the fourth mounting hole 223.

[0017] The blocking cover 200 is located between the first side surface 120 and the second side surface 130 , and the first mounting hole 124 of the first side surface 120 and the second mounting hole 221 of the first connecting arm 220 and the first mounting hole 124 of the second side surface 130 and the second mounting hole 221 of the second connecting arm 230 are concentrically assembled.

[0018] In one embodiment of the present invention, the first lock buckle 310 includes a second middle plate 311, a third connecting arm 312 and a fourth connecting arm 313 fixedly connected to both sides of the second middle plate 311, and a curved plate handle 314 located between the third connecting arm 312 and the fourth connecting arm 313 and fixedly connected to the second middle plate 311. A fifth mounting hole 315 and a sixth mounting hole 316 are coaxially disposed in sequence on the third connecting arm 312 and the fourth connecting arm 313.

[0019] The blocking cover 200 is located between the third connecting arm 312 and the fourth connecting arm 313, and the fifth mounting hole 315 on the third connecting arm 312 and the third mounting hole 222 on the first connecting arm 220, as well as the fifth mounting hole 315 on the fourth connecting arm 313 and the third mounting hole 222 on the second connecting arm 230 are concentrically assembled;

[0020] The second lock buckle 320 includes a first connecting rod 321, and a second connecting rod 322 and a third connecting rod 323 that are connected in the same direction and perpendicularly to the two ends of the first connecting rod 321; and a hook 324 is provided at the other end of the second connecting rod 322 and the third connecting rod 323; the hook 324 is concentrically assembled with the sixth mounting hole 316 on the third connecting arm 312 and the fourth connecting arm 313; when in use, the first connecting rod 321 is engaged in the wavy slot 121.

[0021] The present invention also provides a method for using a cabinet door lock, wherein a fixing frame is provided on the opening side of the cabinet door, the base 100 is fixedly connected to the fixing frame, the blocking cover 200 is rotated, the position of the second lock catch 320 resting on the card slot 121 is adjusted, and the roller 400 is brought into contact with the cabinet door;

[0022] Push the first lock buckle 310 to rotate in the direction of fitting the blocking cover 200, and the roller 400 slowly rolls on the cabinet door and simultaneously moves toward the base 100 to press the cabinet door; when the first lock buckle 310 fits the blocking cover 200, the locking assembly 300 self-locks and the cabinet door is locked; if the self-locking of the locking assembly 300 needs to be released, push the first lock buckle 310 to rotate in the opposite direction.

[0023] Compared with the prior art, the present invention has the following advantages: the locking assembly can quickly and effectively lock and open cabinet doors, with high operating efficiency and a continuous and reliable locking force. The locking assembly has a large cabinet door compression margin, which can be adjusted in multiple gears to meet the installation and locking requirements of different types of cabinet doors. The locking assembly does not require a hole in the cabinet door for installation, fully ensuring the cabinet door's sealing performance. It also has a simple structure and low cost, can be used on a large scale, has universal applicability, is easy to replace, and facilitates subsequent disassembly and maintenance, making it an ideal locking device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The figure is a schematic diagram of a cabinet door lock according to an embodiment of the present invention.

[0025] Figure 2 Schematic diagram of a base according to an embodiment of the present invention.

[0026] Figure 3 Schematic diagram of a blocking cover according to an embodiment of the present invention.

[0027] Figure 4 Schematic diagram of a first lock according to an embodiment of the present invention.

[0028] Figure 5 Schematic diagram of a second lock according to an embodiment of the present invention.

[0029] Figure 6 and Figure 7 Schematic diagram of the cabinet door compression margin according to an embodiment of the present invention.

[0030] Figure 8 and Figure 9 Schematic diagram of the cabinet door lock in the stable state and self-locking state according to an embodiment of the present invention.

[0031] Figure 10 Schematic diagram of cabinet door lock application according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] To facilitate those skilled in the art to understand the technical solution of the present invention, the technical solution of the present invention is further described with reference to the accompanying drawings.

[0033] The terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0034] See also Figure 1 As shown, the present invention discloses a cabinet door lock, comprising a base 100, a cover 200, a locking assembly 300, and a roller 400. One end of the cover 200 is hinged to the base 100, and the roller 400 is hinged to the other end of the cover 200. The locking assembly 300 is nested in and hinged to the cover 200, and snaps onto the base 100. The cabinet door compression allowance can be adjusted on the base 100, and the locking allowance can be adjusted on the cover 200.

[0035] See also Figure 1 and Figure 2As shown, in one embodiment of the present invention, the non-connecting edge of the base 100 away from the roller 400 is a beveled edge, and a wavy retaining groove 121 is provided on the non-connecting edge. Specifically, the base 100 includes a mounting bottom surface 110, and a first side surface 120, a second side surface 130, and a third side surface 140 extending in the same vertical direction along the three sides of the mounting bottom surface 110. The third side surface 140 is located between the first side surface 120 and the second side surface 130. The retaining groove 121 is provided on the first side surface 120, and the second side surface 130 is symmetrically arranged with the first side surface 120.

[0036] The third side surface 140 is lower than the first side surface 120 and the second side surface 130, so that a lug 123 is formed on each of the first side surface 120 and the second side surface 130. The lug 123 is provided with a first mounting hole 124. The mounting bottom surface 110 is also provided with a fixing hole 111, through which the base 100 is fixedly connected to the fixing frame.

[0037] See also Figures 1 to 3 As shown, in one embodiment of the present invention, the blocking cover 200 includes a first middle plate 210, and first and second connecting arms 220 and 230 are fixedly connected on both sides of the first middle plate 210. The length of the first and second connecting arms 220 and 230 protrudes from the first middle plate 210 to form an accommodating space 2123. A second mounting hole 221, a third mounting hole 222, and a fourth mounting hole 223 are coaxially disposed in sequence on the first and second connecting arms 220 and 230. The roller 400 is located in the accommodating space 2123 and is hingedly connected to the first and second connecting arms 220 and 230 via the fourth mounting hole 223.

[0038] The blocking cover 200 is located between the first side surface 120 and the second side surface 130, and the first mounting hole 124 of the first side surface 120 and the second mounting hole 221 of the first connecting arm 220 and the first mounting hole 124 of the second side surface 130 and the second mounting hole 221 of the second connecting arm 230 are concentrically assembled, so that the blocking cover 200 can rotate at a large angle on the base 100.

[0039] See also Figures 1 to 5 As shown, in one embodiment of the present invention, the locking assembly 300 includes a first lock buckle 310 and a second lock buckle 320. The first lock buckle 310 is hinged to the blocking cover 200, and both ends of the second lock buckle 320 are hinged to the first lock buckle 310. The second lock buckle 320 is engaged in the card slot 121 and can adjust the engaging position in the card slot 121.

[0040] Specifically, the first lock catch 310 includes a second middle plate 311, a third connecting arm 312 and a fourth connecting arm 313 fixedly connected to the second middle plate 311 on either side, and a curved plate handle 314 located between the third connecting arm 312 and the fourth connecting arm 313 and fixedly connected to the second middle plate 311. A fifth mounting hole 315 and a sixth mounting hole 316 are coaxially disposed in sequence on the third connecting arm 312 and the fourth connecting arm 313.

[0041] The blocking cover 200 is located between the third connecting arm 312 and the fourth connecting arm 313, and the fifth mounting hole 315 on the third connecting arm 312 and the third mounting hole 222 on the first connecting arm 220, as well as the fifth mounting hole 315 on the fourth connecting arm 313 and the third mounting hole 222 on the second connecting arm 230 are concentrically assembled, so that the first lock buckle 310 can swing on the blocking cover 200.

[0042] The second lock catch 320 includes a first connecting rod 321, and a second connecting rod 322 and a third connecting rod 323 connected perpendicularly to the ends of the first connecting rod 321 in the same direction. A hook 324 is provided at the other end of each of the second connecting rod 322 and the third connecting rod 323. The hook 324 is concentrically assembled with the sixth mounting hole 316 on the third connecting arm 312 and the fourth connecting arm 313. During use, the first connecting rod 321 is engaged with the wavy slot 121.

[0043] See also Figures 1 to 7 As shown, in one embodiment of the present invention, the size of the cabinet door compression margin is determined by the position of the card slot 121. When the second lock buckle 320 is placed on the base 100, in the card slot 121 closest to the hinge point of the base 100 and the cover 200, the roller 400 is farthest from the cabinet door, which is recorded as the farthest distance L1. When the second lock buckle 320 is placed on the base 100, in the card slot 121 farthest from the hinge point of the base 100 and the cover 200, the roller 400 is closest to the cabinet door, which is recorded as the closest distance L2. The cabinet door compression margin is: L1+L2. According to different cabinet door types and cabinet door compression margins, a suitable card slot 121 can be selected for locking and engaging. When locking is required, just push the first lock buckle 310 to fit the cover 200.

[0044] See also Figures 1 to 9As shown, in one embodiment of the present invention, when the locking assembly 300 is locked, the first lock catch 310 is pushed, and the hinge point between the base 100 and the cover 200 is marked as point A. The position of the second lock catch 320 in the slot 121 is marked as point B. The hinge point between the first lock catch 310 and the cover 200 is marked as point C; the hinge point between the second lock catch 320 and the first lock catch 310 is marked as point D. The first lock catch 310 is pushed to rotate around point C. When the line AC between points A and C is collinear with the line CD between points C and D, the cabinet door lock is in a stable state. Figure 8 When line AC and line CD are collinear, points A, B, and D form a triangle, and the cabinet door lock is in a stable state, i.e., a self-locking phenomenon. At this time, the entire cabinet door lock is locked and no longer rotates, but the first lock catch 310 can continue to deflect downward at an angle β on the cover 200.

[0045] Continue to push the first lock buckle 310, so that the first lock buckle 310 rotates around point C in the direction of fitting the cover 200, deflecting the angle β, and point D shifts to point D'. At this time, the first lock buckle 310 fits the cover 200, and the locking assembly 300 is self-locking. Figure 9 The angle β is relatively small, between 5° and 10°, that is, the first lock buckle 310 needs to be rotated by the angle β to achieve self-locking, that is, the entire device has a certain locking margin, ensuring the reliability of the locking.

[0046] Because there's a certain clearance between the third mounting hole 222 for the second latch 320 and the screw diameter at point D', the first latch 310 can be smoothly rotated into the self-locking state. To release the self-locking state, since the length BD' of the second latch 320 remains constant, lifting the first latch 310 causes the cover 200 to shift closer to the base 100. The further down point B is, the greater the shift toward the base 100. The size of point B depends on the specific structural design; a minimum value is recommended. The roller 400 is provided with silicone, which provides a certain degree of elasticity, ensuring smooth opening of the first latch 310.

[0047] See also Figures 1 to 10 As shown, the present invention also provides a method for using a cabinet door lock. A fixing frame 520 is provided on the opening side of a cabinet door 510. The base 100 is fixedly connected to the fixing frame 520. The blocking cover 200 is rotated to adjust the position of the second lock catch 320 on the locking slot 121, and the roller 400 is brought into contact with the cabinet door 510. The dotted line 511 represents the starting position of the cabinet door 510.

[0048] Push the first lock catch 310 to rotate it in the direction of fitting the barrier cover 200. The roller 400 slowly rolls on the cabinet door 510 and simultaneously moves toward the base 100 to compress the cabinet door 510. When the first lock catch 310 fits the barrier cover 200, the locking assembly 300 self-locks and the cabinet door 510 is locked. The cabinet door compression margin is L, at which point the cabinet door lock has completely locked the cabinet door 510. To release the self-locking of the locking assembly 300, push the first lock catch 310 to rotate it in the opposite direction, that is, directly lift the first lock catch 310 upwards so that the first lock catch 310 and the barrier cover 200 are no longer fitted.

[0049] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description. It is intended that all variations within the meaning and range of equivalents of the claims be embraced herein, and any reference signs in the claims should not be construed as limiting the claims to which they relate.

[0050] The above-mentioned embodiments merely represent the implementation methods of the invention. The protection scope of the present invention is not limited to the above-mentioned embodiments. For those skilled in the art, several variations and improvements can be made without departing from the concept of the present invention, which all fall within the protection scope of the present invention.

Claims

1. A cabinet door lock, characterized in that: The cabinet comprises a base (100), a cover (200), a locking assembly (300) and a roller (400); one end of the cover (200) is hinged to the base (100), and the roller (400) is hinged to the other end of the cover (200); the locking assembly (300) is located on the cover (200), is hinged to the cover (200), and is snap-fitted to the base (100), and can adjust the cabinet door compression margin on the base (100) and adjust the locking margin on the cover (200); The locking assembly (300) includes a first lock buckle (310) and a second lock buckle (320); the first lock buckle (310) is hinged to the blocking cover (200), and both ends of the second lock buckle (320) are hinged to the first lock buckle (310); On the base (100), the non-connected edge away from the roller (400) is a beveled edge, and a wave-shaped card slot (121) is provided on the non-connected edge; the second lock buckle (320) is engaged in the card slot (121), and the engagement position can be adjusted in the card slot (121); When the second lock buckle (320) is placed on the base (100) and is in the slot (121) closest to the hinge point between the base (100) and the cover (200), the roller (400) is farthest from the cabinet door, which is recorded as the farthest distance L1; when the second lock buckle (320) is placed on the base (100) and is in the slot (121) farthest from the hinge point between the base (100) and the cover (200), the roller (400) is closest to the cabinet door, which is recorded as the closest distance L2; then the cabinet door compression margin is: L1+L2.

2. The cabinet door lock according to claim 1, characterized in that: When the locking assembly (300) is locked, the first lock buckle (310) is pushed, and the hinge point of the base (100) and the blocking cover (200) is recorded as point A, the position of the second lock buckle (320) in the slot (121) is recorded as point B, the hinge point of the first lock buckle (310) and the blocking cover (200) is recorded as point C; the hinge point of the second lock buckle (320) and the first lock buckle (310) is recorded as point D; the first lock buckle (310) is pushed to rotate the first lock buckle (310) around point C, and when the line AC between point A and point C is collinear with the line CD between point C and point D, the cabinet door lock is in a stable state.

3. The cabinet door lock according to claim 2, characterized in that: Continue to push the first lock buckle (310) so that the first lock buckle (310) rotates around point C in the direction of fitting the blocking cover (200), deflects by an angle β, and point D shifts to point D'. At this time, the first lock buckle (310) fits the blocking cover (200), and the locking assembly (300) is self-locking.

4. The cabinet door lock according to claim 1, characterized in that: The base (100) includes a mounting bottom surface (110), and a first side surface (120), a second side surface (130), and a third side surface (140) extending in the same direction in a vertical direction along three sides of the mounting bottom surface (110); the third side surface (140) is located between the first side surface (120) and the second side surface (130); the slot (121) is provided on the first side surface (120); the second side surface (130) and the first side surface (120) are symmetrically arranged; The height of the third side surface (140) is lower than that of the first side surface (120) and the second side surface (130), so that lugs (123) are formed on both the first side surface (120) and the second side surface (130), and a first mounting hole (124) is provided on the lugs (123).

5. The cabinet door lock according to claim 4, characterized in that: The blocking cover (200) includes a first intermediate plate (210) and two sides of the first intermediate plate (210) fixedly connected to a first connecting arm (220) and a second connecting arm (230); the length of the first connecting arm (220) and the second connecting arm (230) protrudes from the first intermediate plate (210) to form an accommodating space (2123); and a coaxial second mounting hole (221), a third mounting hole (222) and a fourth mounting hole (223) are sequentially provided on the first connecting arm (220) and the second connecting arm (230); the roller (400) is located in the accommodating space (2123) and is hinged to the first connecting arm (220) and the second connecting arm (230) through the fourth mounting hole (223); The blocking cover (200) is located between the first side surface (120) and the second side surface (130), and the first mounting hole (124) of the first side surface (120) and the second mounting hole (221) of the first connecting arm (220) as well as the first mounting hole (124) of the second side surface (130) and the second mounting hole (221) of the second connecting arm (230) are concentrically assembled.

6. The cabinet door lock according to claim 5, characterized in that: The first lock buckle (310) includes a second intermediate plate (311), a third connecting arm (312) and a fourth connecting arm (313) fixedly connected to both sides of the second intermediate plate (311), and a curved plate handle (314) located between the third connecting arm (312) and the fourth connecting arm (313) and fixedly connected to the second intermediate plate (311); and a coaxial fifth mounting hole (315) and a sixth mounting hole (316) are sequentially provided on the third connecting arm (312) and the fourth connecting arm (313); The blocking cover (200) is located between the third connecting arm (312) and the fourth connecting arm (313), and the fifth mounting hole (315) on the third connecting arm (312) and the third mounting hole (222) on the first connecting arm (220), as well as the fifth mounting hole (315) on the fourth connecting arm (313) and the third mounting hole (222) on the second connecting arm (230) are assembled concentrically; The second lock buckle (320) includes a first connecting rod (321), and a second connecting rod (322) and a third connecting rod (323) connected to the first connecting rod (321) at both ends in the same direction and perpendicularly; and hooks (324) are provided at the other ends of the second connecting rod (322) and the third connecting rod (323); the hooks (324) are concentrically assembled with the sixth mounting holes (316) on the third connecting arm (312) and the fourth connecting arm (313); when in use, the first connecting rod (321) is engaged in the wavy slot (121).

7. A method for using a cabinet door lock according to any one of claims 1 to 6, characterized in that: A fixing frame is provided on the opening side of the cabinet door, the base (100) is fixedly connected to the fixing frame, the blocking cover (200) is rotated, the position of the second lock catch (320) resting on the card slot (121) is adjusted, and the roller (400) is brought into contact with the cabinet door; The first lock catch (310) is pushed to rotate in the direction of fitting the stop cover (200), and the roller (400) slowly rolls on the cabinet door and simultaneously moves in the direction close to the base (100) to press the cabinet door; when the first lock catch (310) fits the stop cover (200), the locking assembly (300) self-locks and the cabinet door is locked; if the self-locking of the locking assembly (300) needs to be released, the first lock catch (310) is pushed to rotate the first lock catch (310) in the opposite direction.

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