Double built-in lock structure of advertising machine

By adopting a double concealed lock structure and a hidden keyhole design on the advertising machine, the problems of unsightly appearance and low security performance of exposed door locks are solved, achieving the effects of being beautiful, anti-theft and easy to maintain.

CN223305556UActive Publication Date: 2025-09-05SHENZHEN YOUJING COMMERCIAL DISPLAY CO LTD
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Patent Information

Application Number
CN202421682924.X
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-07-16
Publication Date
2025-09-05
Estimated Expiration
2034-07-16

AI Technical Summary

Technical Problem

The door locks of existing advertising machines are exposed, which is unsightly and has low security performance, increasing the risk of loss and repair, resulting in high operating costs.

Method used

It adopts a double hidden lock structure, including a first lock component and a second lock component. The lock hole is hidden in the hidden groove. Combined with the design of movable blocks, movable plates and card columns, locking and unlocking are achieved through key operation.

Benefits of technology

The anti-theft performance of the advertising machine is improved, the appearance is simple and beautiful, the production cost is reduced, and it is easy to operate, repair and replace.

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Abstract

The utility model relates to a double built-in lock structure of an advertising machine, the advertising machine comprises a frame body and a front door plate hinged on the frame body, a first lock catch assembly used for fixedly connecting the front door plate with the frame body and a second lock catch assembly used for locking the first lock catch assembly are arranged in the other side, far away from the hinged position, of the frame body, the frame body is provided with a first lock hole corresponding to the first lock catch assembly and a second lock hole corresponding to the second lock catch assembly, the end, close to the front door plate, of the frame body is provided with an inwards-sunken step, and the first lock hole and the second lock hole are formed in the step; when the front door plate is closed, the front door plate and the step form a hidden groove for hiding the first lock hole and the second lock hole; the advertising machine is attractive in overall appearance, the door lock has good waterproof, dustproof and anti-theft effects at the same time, the anti-theft performance of the advertising machine is improved by arranging the double safety locks, and the use requirement is met; the anti-theft lock is simple in structure and easy to operate, maintain and replace.
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Description

Technical Field

[0001] The utility model relates to the technical field of advertising machines, in particular to a double hidden lock structure of an advertising machine. Background Art

[0002] Advertising machines are commercial display devices designed specifically for outdoor environments. They are used to display various advertising content and can display information in all weather conditions, providing high-quality visual and auditory enjoyment for outdoor information dissemination. They are widely used in various fields such as commercial areas (CBDs), bus stops with large passenger flow, airports, railway stations, docks, parks and squares, leisure places, tourist attractions, high-end residential areas, the catering industry, government and corporate publicity.

[0003] Currently, the door locks of advertising machines are exposed, or screws are used instead of door locks. The overall appearance is not beautiful enough, and the safety performance is low, which makes the advertising machine itself at risk of loss or damage, which will directly lead to economic losses for advertisers and operators. Frequent equipment loss and maintenance will increase operating costs and reduce the return on investment.

[0004] Application Contents

[0005] In view of this, the present invention aims to address the deficiencies in the prior art, and its main purpose is to provide a double hidden lock structure for an advertising machine. The overall appearance of the advertising machine is beautiful, and the door lock also has good waterproof, dustproof and anti-theft effects. By setting up a double security hidden lock, the anti-theft performance of the advertising machine is improved to meet the usage requirements; the anti-theft lock has a simple structure and is easy to operate, maintain and replace.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A double hidden lock structure for an advertising machine, the advertising machine includes a frame and a front door panel hinged on the frame, the frame is provided with a first lock assembly for fixing the front door panel to the frame on the other side away from the hinge, and a second lock assembly for locking the first lock assembly, the frame is respectively provided with a first lock hole corresponding to the first lock assembly and a second lock hole corresponding to the second lock assembly, the frame has an inwardly recessed step at one end close to the front door panel, the first lock hole and the second lock hole are arranged on the step; when the front door panel is closed, the front door panel and the step form a lock hole for hiding the first lock hole and the second lock hole. The hidden groove of the hole, the first lock assembly includes a movable block, a movable plate, a locking block and a clamping column arranged on the movable plate, the movable block is connected to the movable plate, the movable block is provided with a first keyhole, the first keyhole corresponds to the first lock hole, there are multiple clamping columns, and the multiple clamping columns are arranged at intervals along the extension direction of the movable plate, and the inner side of the front door panel is provided with a clamping groove corresponding to the clamping column, the locking block is fixedly arranged on the movable block or the movable plate, and the second lock assembly cooperates with the locking block to limit the sliding of the movable plate and the movable block, thereby locking or unlocking the first lock assembly.

[0008] As a preferred solution, the clamping column includes a column and a clamping block, one end of the column is fixedly connected to the movable plate, and the clamping block is arranged at the other end of the clamping column away from the movable plate, and the diameter of the clamping block is larger than the diameter of the column.

[0009] As a preferred solution, a snap-on plate is provided on the front door panel, and the snap-on plate is in the shape of a hollow strip tube. The snap-on groove is arranged on the side wall of the snap-on plate, and the snap-on groove extends in the vertical direction. The snap-on groove includes a connected entry and exit position and a snap-on position, and the entry and exit position is arranged at one end of the snap-on position. The diameter of the entry and exit position is larger than the diameter of the snap-on block, the diameter of the snap-on position is larger than the diameter of the column, and the diameter of the snap-on position is smaller than the diameter of the snap-on block; when the front door panel is snapped and locked with the frame, the snap-on column is embedded in the snap-on position.

[0010] As a preferred solution, a waist-shaped hole for fixing the buckle plate on the front door panel is provided on the side wall of the buckle plate opposite to the clamping groove, and an avoidance through hole is provided on the side wall of the buckle plate opposite to the waist-shaped hole.

[0011] As a preferred solution, the first locking assembly further includes a support plate fixedly arranged on the frame, the support plate is provided with a through slot passing through the support plate, and the clamping column is inserted into the through slot.

[0012] As a preferred solution, a mounting bracket is fixedly mounted on the inner wall of the frame, the mounting bracket is recessed with a mounting groove, the support plate is fixedly mounted in the mounting groove, the movable block and the movable plate are slidably mounted in the mounting groove, and an avoidance groove for the clamping column to pass through is provided on the side wall of the mounting groove.

[0013] As a preferred solution, the second lock catch assembly includes a lock core, a mounting seat and a limit rod. The second lock catch assembly is arranged on the side of the locking block. The mounting seat is fixed to the frame. The limit rod is connected to the lock core. The lock core is rotatably set on the mounting seat, and the key socket of the lock core corresponds to the second lock hole. The limit rod cooperates with the locking block to limit the sliding of the movable plate, thereby locking or unlocking the first lock catch assembly.

[0014] As a preferred solution, the limit rod is arranged at one end of the lock core away from the second lock hole, and the limit rod is eccentrically connected to the lock core; after the lock core is inserted with the corresponding second key and rotated a certain angle, the limit rod is driven by the lock core to rotate to the side close to the movable plate, and the limit rod is at the upper end or lower end of the locking block, thereby limiting the up and down movement of the locking block, at this time the second lock catch assembly is in a locked state; the limit rod is driven by the lock core to rotate to the side away from the movable plate, and leaves the up and down movement path of the locking block, at this time when the second lock catch assembly is in an unlocked state, the locking block can move up and down.

[0015] As a preferred solution, the cross-section of the first keyhole is rectangular, and the teeth of the first key are flat rectangles.

[0016] The above-mentioned double hidden lock structure of the advertising machine has obvious advantages and beneficial effects compared with the existing technology. Specifically, it can be seen from the above technical solution that the door lock of the utility model adopts a built-in installation, and only a keyhole for key access is reserved on the exterior surface, and the keyhole is hidden in the hidden groove, so that the overall appearance of the advertising machine is simple and beautiful. The door lock also has good waterproof, dustproof and anti-theft effects, which increases the service life of the advertising machine. By setting a double security lock, the anti-theft performance of the advertising machine is improved to meet the use requirements; the anti-theft lock has a simple structure, reduces production costs, and is easy to operate, repair and replace. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of an advertising machine according to an embodiment of the present utility model.

[0018] Figure 2 This is a state diagram of the front door panel of an embodiment of the present utility model when it is open.

[0019] Figure 3It is a structural schematic diagram of the first locking component and the second locking component of an embodiment of the present utility model.

[0020] Figure 4 This is an embodiment of the present invention Figure 3 Enlarged schematic diagram of point A in the middle.

[0021] Figure 5 This is a structural schematic diagram of the first locking component and the second locking component from another perspective of an embodiment of the present utility model.

[0022] Figure 6 It is a structural schematic diagram of a buckle plate according to an embodiment of the present utility model.

[0023] Figure 7 This is an embodiment of the present invention Figure 6 Enlarged schematic diagram of point B in the middle.

[0024] Figure 8 It is a structural schematic diagram of the first key of an embodiment of the present utility model.

[0025] Description of reference numerals:

[0026] 100, frame; 110, first lock hole; 120, second lock hole; 130, step; 140, hidden groove;

[0027] 200, front door panel; 210, buckle plate; 220, snap-fit ​​groove; 221, entry and exit position; 222, snap-fit ​​position; 230, waist-shaped hole; 240, avoidance through hole;

[0028] 300, first locking assembly; 310, movable block; 311, first keyhole; 320, movable plate; 330, clamping column; 331, column; 332, clamping block; 340, support plate; 341, through slot; 350, mounting bracket; 351, mounting slot; 352, avoidance slot; 360, locking block;

[0029] 400, second lock assembly; 410, limit rod; 420, lock core; 430, mounting seat;

[0030] 500. The first key. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0033] See also Figures 1 to 8 , showing a double hidden lock structure of an advertising machine provided by an embodiment of the present invention, comprising a frame 100 and a front door panel 200 hinged at the front end of the frame 100, a first lock component 300 for fixing the front door panel 200 to the frame 100 is provided inside the other side of the frame 100 away from the hinge, and a second lock component 400 for locking the first lock component 300, a first lock hole 110 corresponding to the first lock component 300 and a second lock hole 120 corresponding to the second lock component 400 are respectively provided on the frame 100, an end of the frame 100 close to the front door panel 200 has an inwardly recessed step 130, the first lock hole 110 and the second lock hole 120 are arranged on the step 130; when the front door panel 200 is closed, as shown Figure 1As shown, the edge of the front door panel 200 near the step 130 forms a U-shaped dark groove 140 with the step 130 for hiding the first lock hole 110 and the second lock hole 120. The first lock assembly 300 includes a movable block 310, a movable plate 320, a locking block 360 and a clamping column 330 arranged on the movable plate 320. The movable block 310 is connected to the movable plate 320 and is used to drive the movable plate 320 to move up and down. The movable block 310 is provided with a first keyhole 311, and the first keyhole 311 corresponds to the first lock hole 110. There are multiple clamping columns 330, and the multiple clamping columns 330 are arranged at intervals along the extension direction of the movable plate 320. A clamping groove 220 corresponding to the clamping column 330 is provided on the inner side of the front door panel 200. The locking block 360 is fixedly set on the movable block 310 or the movable plate 320. The second lock The assembly 400 cooperates with the locking block 360 to limit the sliding movement of the movable plate 320 and the movable block 310, thereby locking or unlocking the first locking assembly 300. In this embodiment, the locking block 360 is L-shaped, with one end connected to the movable plate 320 and the other end bent and extending away from the latching post 330. The recessed groove 140 has a depth of 0.5 to 2 cm and a width of 0.5 to 2 cm. The recessed groove 140 conceals the first and second lock holes 110 and 120, making the advertising machine more concise and beautiful overall and improving the anti-theft effect. The dual security locks of the first and second locking assemblies 300 and 400 improve the anti-theft performance of the advertising machine and meet user requirements. The first and second locking assemblies 300 and 400 are simple in structure and easy to operate, repair, and replace. In other embodiments, multiple recessed grooves 140 can be provided on the side of the frame 100, and multiple false lock holes can be provided within the recessed grooves 140 to achieve a higher degree of confusion and concealment.

[0034] Furthermore, the clamping column 330 includes a column 331 and a clamping block 332. One end of the column 331 is fixedly connected to the movable plate 320. The clamping block 332 is arranged at the other end of the clamping column 330 away from the movable plate 320. The diameter of the clamping block 332 is larger than the diameter of the column 331.

[0035] Furthermore, a snap-on plate 210 is provided on one end of the front door panel 200 close to the frame 100. The snap-on plate 210 is vertically arranged and is in the shape of a hollow strip tube. The snap-on groove 220 is arranged on the side wall of the snap-on plate 210 away from the front door panel 200 and passes through the side wall. The snap-on groove 220 extends in the vertical direction. The snap-on groove 220 includes a connected entry and exit position 221 and a snap-on position 222. The entry and exit position 221 is arranged at one end of the snap-on position 222. The diameter of the entry and exit position 221 is larger than the diameter of the snap-on block 332. The diameter of the snap-on position 222 is larger than the diameter of the column 331. The diameter of the snap-on position 222 is smaller than the diameter of the snap-on block 332. When the front door panel 200 is snapped and locked with the frame 100, the snap-on column 330 is embedded in the snap-on position 222. In this embodiment, the entry and exit position 221 is set at the upper end of the locking position 222. When locking the front door panel 200, the locking block 332 penetrates from the entry and exit position 221 into the hollow part of the locking plate 210, and then the movable plate 320 drives the locking column 330 to move downward, and the column 331 slides into the locking position 222, and the locking block 332 is embedded in the inner side of the locking position 222, so that the front door panel 200 is locked on the front side of the frame 100 and cannot be opened.

[0036] Furthermore, a plurality of waist-shaped holes 230 for fixing the locking block 360 on the front door panel 200 are provided on the side wall of the locking block 360 relative to the snap-on groove 220. The waist-shaped holes 230 facilitate adjustment of the vertical position of the snap-on plate 210 during installation, so that the snap-on plate 210 can adapt to the snap-on column 330. An avoidance through-hole 240 is provided on the side wall of the snap-on plate 210 relative to the waist-shaped holes 230, so that the locking block 360 can be installed on the front door panel 200 by passing bolts through the avoidance through-hole 240 and the waist-shaped holes 230.

[0037] Furthermore, the first locking assembly 300 also includes a support plate 340 fixedly set on the frame 100, and a through groove 341 is provided on the support plate 340, which passes through the support plate 340, and the clamping column 330 is passed through the through groove 341; the support plate 340 is used to limit and position the movable plate 320.

[0038] Furthermore, a mounting bracket 350 is fixedly mounted on the inner sidewall of the frame 100. The mounting bracket 350 is recessed with a mounting slot 351. The support plate 340 is fixedly mounted within the mounting slot 351. The movable block 310 and the movable plate 320 are slidably mounted within the mounting slot 351. The sidewalls of the mounting slot 351 are provided with a clearance slot 352 for the clamping post 330 to pass through. The mounting slot 351 cooperates with the support plate 340, so that the movable plate 320 is clamped between the sidewalls of the mounting slot 351 and the support plate 340, and can only move up and down.

[0039] Furthermore, the second lock assembly 400 includes a lock core 420, a mounting base 430, and a limiting rod 410. The second lock assembly 400 is disposed beside the locking block 360. The mounting base 430 is mounted and fixed to the frame 100. The limiting rod 410 is connected to the lock core 420. The lock core 420 is rotatably mounted on the mounting base 430. The key insertion opening of the lock core 420 corresponds to the position of the second lock hole 120. The limiting rod 410 cooperates with the locking block 360 to limit the sliding movement of the movable plate 320, thereby locking or unlocking the first lock assembly 300. In this embodiment, the mounting base 430 is mounted and fixed to the mounting frame 350.

[0040] Furthermore, the limit rod 410 is arranged at one end of the lock core 420 away from the second lock hole 120, and the limit rod 410 is eccentrically connected to the lock core 420; after the lock core 420 is inserted with the corresponding second key and rotated a certain angle, the limit rod 410 is driven by the lock core 420 to rotate to the side close to the movable plate 320, and the limit rod 410 is at the upper end or lower end of the locking block 360, thereby limiting the up and down movement of the locking block 360. At this time, the second lock catch assembly 400 is in a locked state; the limit rod 410 is driven by the lock core 420 to rotate to the side away from the movable plate 320, and leaves the travel path of the up and down movement of the locking block 360. At this time, when the second lock catch assembly 400 is in an unlocked state, the locking block 360 can move up and down.

[0041] Furthermore, the cross-section of the first keyhole 311 is rectangular, and the teeth of the first key 500 are flat rectangles. When the first key 500 is inserted into the first keyhole 311 and rotated a certain angle along the axis of the first key 500, the corners of the first key 500 abut against the inner upper wall of the first keyhole 311, and drive the movable block 310 to move in the vertical direction, or the first key 500 abuts against the inner upper wall of the first keyhole 311 to tilt the movable block 310 upward, thereby unlocking the front door panel 200; when the first key 500 is rotated or pulled out, the movable block 310 and the movable plate 320 slide downward under the action of gravity, and the front door panel 200 can be locked; the first key 500 and the first lock assembly 300 have a simple structure and low production cost. In this embodiment, there are two movable plates 320, and the two movable plates 320 are respectively installed at the upper and lower ends of the movable block 310. In other embodiments, the first key 500 can also be in the shape of an eccentric cam. The eccentric cam is rotated along the axis of the first key 500 to push the movable block 310 upward, thereby driving the clamping column 330 on the movable plate 320 to move in the vertical direction to unlock the front door panel 200.

[0042] It can be understood that the shapes of the first keyholes 311 of multiple advertising machines are set to the same shape, that is, one first key 500 can unlock the first lock components 300 of multiple advertising machines, and the second keys corresponding to the lock cores of the second lock components 400 of multiple advertising machines are general anti-theft keys. When maintaining multiple advertising machines of the present invention, the staff only needs to carry multiple second keys corresponding to the second lock components 400 and one first key 500 of the first lock component 300, thereby reducing the number of keys carried by the staff.

[0043] The double concealed lock structure of the above-mentioned advertising machine makes the overall appearance of the advertising machine simple and beautiful by setting a structure of a hidden door lock. The door lock also has good waterproof, dustproof and anti-theft effects, which increases the service life of the advertising machine. By setting a double security lock, the anti-theft performance of the advertising machine is improved to meet the use requirements; the anti-theft lock has a simple structure, reduces production costs, and is easy to operate, repair and replace.

[0044] It should be noted that the present invention is not limited to the above-mentioned embodiments. According to the creative spirit of the present invention, those skilled in the art can also make other changes. These changes made according to the creative spirit of the present invention should be included in the scope of protection required by the present invention.

Claims

1. A double hidden lock structure for an advertising machine, characterized in that: The advertising machine comprises a frame (100) and a front door panel (200) hinged on the frame (100); a first locking assembly (300) for fixing the front door panel (200) to the frame (100) is provided inside the other side of the frame (100) away from the hinge, and a second locking assembly (400) for locking the first locking assembly (300); a first locking hole (110) corresponding to the first locking assembly (300) and a second locking hole (400) corresponding to the second locking assembly (300) are respectively provided on the frame (100). The second lock hole (120) corresponds to the lock assembly (400), and the frame (100) has an inwardly recessed step (130) at one end close to the front door panel (200), and the first lock hole (110) and the second lock hole (120) are arranged on the step (130); when the front door panel (200) is closed, the edge of the front door panel (200) and the step (130) form a hidden groove (140) for hiding the first lock hole (110) and the second lock hole (120). The first locking assembly (300) includes a movable block (310), a movable plate (320), a locking block (360), and a clamping column (330) provided on the movable plate (320), wherein the movable block (310) is connected to the movable plate (320), and a first keyhole (311) is provided on the movable block (310), wherein the first keyhole (311) corresponds to the first lock hole (110), and the clamping column (330) is provided in plurality, and the plurality of clamping columns (330) are arranged along the movable plate ( The front door panel (200) is arranged at intervals in the extension direction thereof, a clamping groove (220) corresponding to the clamping column (330) is provided on the inner side of the front door panel (200), and the locking block (360) is fixedly arranged on the movable block (310) or the movable plate (320), and the second locking assembly (400) cooperates with the locking block (360) to limit the sliding of the movable plate (320) and the movable block (310), thereby locking or unlocking the first locking assembly (300).

2. The double hidden lock structure of the advertising machine according to claim 1, characterized in that: The clamping column (330) comprises a column (331) and a clamping block (332), one end of the column (331) is fixedly connected to the movable plate (320), and the clamping block (332) is arranged at the other end of the clamping column (330) away from the movable plate (320), and the diameter of the clamping block (332) is larger than the diameter of the column (331).

3. The double hidden lock structure of the advertising machine according to claim 2, characterized in that: The front door panel (200) is provided with a buckling plate (210), the buckling plate (210) is in the shape of a hollow strip tube, the clamping groove (220) is arranged on the side wall of the buckling plate (210), the clamping groove (220) extends in the vertical direction, the clamping groove (220) includes a connected entry and exit position (221) and a clamping position (222), the entry and exit position (221) is arranged at one end of the clamping position (222), the diameter of the entry and exit position (221) is larger than the diameter of the clamping block (332), the diameter of the clamping position (222) is larger than the diameter of the column (331), and the diameter of the clamping position (222) is smaller than the diameter of the clamping block (332); when the front door panel (200) is buckled and locked with the frame (100), the clamping column (330) is embedded in the clamping position (222).

4. The double hidden lock structure of the advertising machine according to claim 3, characterized in that: A waist-shaped hole (230) for fixing the buckle plate (210) on the front door panel (200) is provided on the side wall of the buckle plate (210) opposite to the clamping groove (220), and an avoidance through hole (240) is provided on the side wall of the buckle plate (210) opposite to the waist-shaped hole (230).

5. The double hidden lock structure of the advertising machine according to claim 1, characterized in that: The first locking assembly (300) further comprises a support plate (340) fixedly arranged on the frame (100), the support plate (340) being provided with a through slot (341) penetrating the support plate (340), and the clamping column (330) being inserted into the through slot (341).

6. The double hidden lock structure of the advertising machine according to claim 5, characterized in that: A mounting frame (350) is fixedly mounted on the inner side wall of the frame (100), and a mounting groove (351) is recessed in the mounting frame (350). The support plate (340) is fixedly mounted in the mounting groove (351), and the movable block (310) and the movable plate (320) are slidably mounted in the mounting groove (351). An avoidance groove (352) for the clamping column (330) to pass through is provided on the side wall of the mounting groove (351).

7. The double hidden lock structure of the advertising machine according to claim 1, characterized in that: The second lock assembly (400) includes a lock core (420), a mounting seat (430) and a limiting rod (410). The second lock assembly (400) is arranged on the side of the locking block (360). The mounting seat (430) is fixed on the frame (100). The limiting rod (410) is connected to the lock core (420). The lock core (420) is rotatably arranged on the mounting seat (430), and the key socket of the lock core (420) corresponds to the second lock hole (120). The limiting rod (410) cooperates with the locking block (360) to limit the sliding of the movable plate (320), thereby locking or unlocking the first lock assembly (300).

8. The double hidden lock structure of the advertising machine according to claim 7, characterized in that: The limiting rod (410) is arranged at one end of the lock core (420) away from the second lock hole (120), and the limiting rod (410) is eccentrically connected to the lock core (420); after the lock core (420) is inserted with the corresponding second key and rotated to a certain angle, the limiting rod (410) is driven by the lock core (420) to rotate to a side close to the movable plate (320), and the limiting rod (410) is located at the upper end or lower end of the locking block (360), thereby limiting the locking block (360) from moving up and down, and at this time the second lock catch assembly (400) is in a locked state; the limiting rod (410) is driven by the lock core (420) to rotate to a side away from the movable plate (320) and leave the travel path of the locking block (360) moving up and down, and at this time when the second lock catch assembly (400) is in an unlocked state, the locking block (360) can move up and down.

9. The double hidden lock structure of the advertising machine according to claim 1, characterized in that: The cross section of the first keyhole (311) is rectangular, and the cross section of the teeth of the first key (500) is a flat rectangle.