Automatic buckle device, strap assembly and watch

Abstract

The present invention discloses an automatic locking device, a watch band assembly and a watch. The automatic locking device includes a main body component, a movable extension component and an elastic component. The main body component includes a main body substrate and a limiting baffle. The limiting baffles are respectively connected to two opposite sides of the main body substrate. A limiting through groove is formed between the oppositely arranged limiting baffles and the main body substrate. The movable extension component is arranged in the limiting through groove. The movable extension component has a movable extension plate which is located in the limiting through groove. The elastic component is located in the limiting through groove and both ends of the elastic component are respectively connected to the main body substrate and the surface of the movable extension plate facing the substrate. When the movable extension plate is pushed, the movable extension plate can move along the extension direction of the limiting through groove. The automatic locking device of the present invention has a simple structure, low cost and wide application range.

Description

Technical Field

[0001] The present invention relates to an automatic locking device, a strap assembly and a watch. Background Art

[0002] There are various connection methods between two objects, such as snap connection, hinge connection or locking connection, etc. When realizing the connection of two buckle straps on articles such as watch straps, girdles, belts, etc., a lock is generally used, and the lock can realize the opening or locking of two buckle straps. In the field of watchmaking, the locking structure between the watch straps of general watches is complex, troublesome to open and close, and is severely worn after multiple uses, affecting the functions of the watch strap and the lock. Summary of the Invention

[0003] Based on this, it is necessary to provide an automatic locking device, a strap assembly and a watch. The automatic locking device of the present invention has a simple structure, low cost and wide application range.

[0004] An automatic locking device includes a main body component, a movable extension component and an elastic component. The main body component includes a main body substrate and a limit baffle. The limit baffles are respectively connected to two opposite sides of the main body substrate. A limit through groove is formed between the relatively arranged limit baffles and the main body substrate. The movable extension component is arranged in the limit through groove. The movable extension component has a movable extension plate, and the movable extension plate is located in the limit through groove. The elastic component is located in the limit through groove, and two ends of the elastic component are respectively connected to the main body substrate and the surface of the movable extension plate facing the substrate. When the movable extension plate is pushed, the movable extension plate can move along the extension direction of the limit through groove.

[0005] In one embodiment, the main body component further includes a first limit post. The first limit post is arranged in the limit through groove, located between the relatively arranged limit baffles and connected to the main body substrate. One end of the elastic component is connected to the first limit post.

[0006] In one embodiment, the movable extension component further includes a second limit post. The second limit post is arranged in the limit through groove. The second limit post is connected to the surface of the movable extension plate facing the substrate. The other end of the elastic component is connected to the second limit post.

[0007] In one embodiment, the elastic component is a torsion spring. The first limit post is arranged close to one of the limit baffles, and the second limit post is arranged close to the other limit baffle. Two ends of the elastic component are respectively sleeved on the first limit post and the second limit post.

[0008] In one embodiment, the main body component further includes a guide member disposed in the limit through groove. The guide member is located between the oppositely arranged limit baffles and connected to the main body substrate. The guide member has a guide surface perpendicular to the main body substrate, and the guide surface is used to guide the movement of the elastic member.

[0009] In one embodiment, the guide surface gradually approaches the limit baffle from the inside of the limit through groove towards the port direction of the limit through groove.

[0010] In one embodiment, two limit through grooves are respectively formed between the oppositely arranged limit baffles and the two surfaces of the main body substrate. The movable extension member and the elastic member are respectively disposed in the two limit through grooves.

[0011] In one embodiment, the automatic locking device further includes a cover member. Each limit through groove is correspondingly provided with a cover member, and the cover member is connected to the main body component to cover the corresponding limit through groove.

[0012] In one embodiment, the cover member includes a covering plate and connecting fixing plates. A plurality of connecting fixing plates are connected to the covering plate. The connecting fixing plates are perpendicular to the covering plate. The covering plate covers the oppositely arranged limit baffles and is connected to the limit baffles.

[0013] In one embodiment, the cover member further includes a fastener. The connecting fixing plate has a connecting through hole, and the limit baffle is provided with a limit through hole corresponding to the connecting through hole. The fastener passes through the connecting through hole and the limit through hole to realize the detachable connection between the covering plate and the limit baffle.

[0014] In one embodiment, the connecting fixing plates are distributed on opposite sides of the covering plate, and the connecting fixing plates on each side of the covering plate are spaced apart.

[0015] Another object of the present invention is to provide a watchband assembly.

[0016] A watchband assembly includes a first watchband, a second watchband, and the automatic locking device. The main body substrate of the automatic locking device is connected to the first watchband, and the movable extension plate is connected to the second watchband. When the automatic locking device has two movable extension members, the first watchband and the second watchband are respectively connected to the movable extension plates of the two movable extension members.

[0017] Another object of the present invention is to provide a watch.

[0018] A watch, comprising a dial body and the strap assembly described above, wherein the first strap and the second strap are respectively connected to the dial body.

[0019] The above-mentioned automatic locking device has a simple structure, low cost, and a wide range of applications. When the above-mentioned automatic locking device is in use, the opening and closing states of the lock can be achieved as long as a pushing and pulling operation is performed, and the opening and closing are convenient. In the present invention, the movement track of the movable extension plate is restricted by the limiting through groove and the elastic member. When the movable extension plate is pushed, the movable extension plate moves along the limiting through groove, and the movable extension plate can perform an extending action to provide an "open" state. When the movable extension plate is pushed reversely, the movable extension plate resets and retracts into the limiting through groove to reach the "closed" state. The above-mentioned open state and closed state are both stable and easy to perform, realizing the bistable position of the movable extension plate, and thus realizing the open or closed state of the lock. With one pulling action by the user, the automatic locking device can be opened, that is, the movable extension plate extends outwards, and at the same time, the position of the elastic member is changed. The resilience of the spring will maintain the movable extension plate in the open state. Similarly, with one pushing action by the user, the automatic locking device can be closed, and the elastic member can maintain the movable extension plate in the closed state.

[0020] The above-mentioned automatic locking device is provided with a first limiting post for facilitating the connection and fixation of the elastic member, and a second limiting post for facilitating the connection and fixation of the elastic member.

[0021] The above-mentioned automatic locking device is provided with a torsion spring as the elastic member for easy installation. During installation, the two ends of the elastic member are respectively sleeved on the first limiting post and the second limiting post, and the first limiting post is arranged close to one of the limiting baffles, and the second limiting post is arranged close to the other limiting baffle. In this way, the smooth movement of the middle body of the torsion spring can be ensured, and the interference of the first limiting post and the second limiting post on the middle body of the torsion spring can be avoided.

[0022] The above-mentioned automatic locking device is provided with a guiding member. The guiding surface perpendicular to the main body substrate can be used to guide the elastic member. The middle body of the torsion spring moves along with the extension of the movable extension plate. In order to avoid the deviation of the movement track of the torsion spring, the guiding surface is provided to help the torsion spring move along the correct track, ensuring the stability of the entire automatic locking device.

[0023] The above-mentioned automatic locking device is provided with a guiding surface that gradually approaches the limiting baffle opposite to the guiding surface from the inside of the limiting through groove towards the port of the limiting through groove, which can ensure that when the middle body of the torsion spring moves to the port of the limiting through groove, it is clamped by the guiding surface and the limiting baffle, ensuring the stability of the automatic locking device in the open state.

[0024] The above-mentioned automatic locking device is provided with a cover body component, which can ensure the movement of the movable extension plate between the limit through groove and the covering plate, preventing the movable extension plate from detaching, and directly improving the working stability of the automatic locking device.

[0025] The above-mentioned automatic locking device is provided with fasteners, and the fasteners are arranged to pass through the connecting through hole and the limit through hole to realize the detachable connection between the covering plate and the limit baffle, which is convenient for the disassembly and maintenance of the automatic locking device.

[0026] The connecting fixing plates on each side of the covering plate of the above-mentioned automatic locking device are distributed at intervals, which can ensure that each part of the covering plate can be connected to the limit baffle.

[0027] The above-mentioned watch band assembly has a simple structure, low cost and wide application range. As long as a pushing and pulling operation is performed, the opening and closing states of the lock on the watch band assembly can be realized, and the opening and closing are convenient. With one pulling action by the user, the automatic locking device can be opened, that is, the movable extension plate extends outwards, and at the same time, the position of the elastic component is changed, and the resilience of the spring will maintain the movable extension plate in the open state.

[0028] For the above-mentioned watch, by setting a watch band assembly containing an automatic locking device, as long as a pushing and pulling operation is performed, the opening and closing states of the lock on the watch band assembly can be realized, and the opening and closing are convenient and the use is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the automatic locking device according to an embodiment of the present invention;

[0030] Figure 2 Process diagrams of the open state and the closed state of the automatic locking device according to an embodiment of the present invention.

[0031] DESCRIPTION OF THE REFERENCE NUMERALS

[0032] 10. Automatic locking device; 100. Main body component; 110. Main body substrate; 120. Limit baffle; 121. Limit through hole; 130. First limit post; 140. Guide member; 200. Movable extension component; 210. Movable extension plate; 220. Second limit post; 300. Elastic component; 400. Cover body component; 410. Covering plate; 420. Connecting fixing plate; 421. Connecting through hole; 430. Fastener. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0034] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "bottom", "inner", "outer", etc. in the present invention is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0035] It should be understood that terms such as "first" and "second" are used in the present invention to describe various information, but such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0036] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "connected" and "connected to" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. That is, when an element is referred to as "fixed to" another element, it may be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0038] Please refer to Figure 1 As shown, an embodiment of the present invention provides an automatic locking device 10.

[0039] An automatic locking device 10 includes a main body member 100, a movable extension member 200, and an elastic member 300.

[0040] The main body component 100 includes a main body substrate 110 and a limiting baffle 120. The limiting baffles 120 are respectively connected to two opposite sides of the main body substrate 110. A limiting through groove is formed between the oppositely arranged limiting baffles 120 and the main body substrate 110.

[0041] An active extension component 200 is arranged in the limiting through groove. The active extension component 200 has an active extension plate 210. The active extension plate 210 is located in the limiting through groove. The elastic component 300 is located in the limiting through groove, and two ends of the elastic component 300 are respectively connected to the main body substrate 110 and the surface of the active extension plate 210 facing the substrate. When the active extension plate 210 is pushed to move towards the outside of the notch of the limiting through groove, the active extension plate 210 can move along the extending direction of the limiting through groove to open the automatic locking device 10. When the active extension plate 210 is pushed to reset, that is, to move towards the inside of the limiting through groove, the automatic locking device 10 is closed.

[0042] In one embodiment, the main body component 100 further includes a first limiting post 130. The first limiting post 130 is arranged in the limiting through groove. The first limiting post 130 is located between the oppositely arranged limiting baffles 120 and is connected to the main body substrate 110. One end of the elastic component 300 is connected to the first limiting post 130.

[0043] Preferably, the length of the first limiting post 130 is less than the depth of the limiting through groove. With such a setting, the smooth sliding of the active extension plate 210 is ensured. The length of the second limiting post 220 is less than the depth of the limiting through groove. With such a setting, the smooth sliding of the active extension plate 210 is ensured. Further, the first limiting post 130 is of a cylindrical structure. With such a setting, when one end of the torsion spring is sleeved on the first limiting post 130, it can rotate smoothly along with the movement of the active extension plate 210. Further, the second limiting post 220 is of a cylindrical structure. With such a setting, when the other end of the torsion spring is sleeved on the second limiting post 220, it can rotate smoothly along with the movement of the active extension plate 210.

[0044] In one embodiment, the active extension component 200 further includes a second limiting post 220. The second limiting post 220 is arranged in the limiting through groove. The second limiting post 220 is connected to the surface of the active extension plate 210 facing the substrate. The other end of the elastic component 300 is connected to the second limiting post 220. By providing the first limiting post 130 in the above-mentioned automatic locking device 10, it is convenient for the connection and fixation of the elastic component 300. By providing the second limiting post 220, it is convenient for the connection and fixation of the elastic component 300.

[0045] In one embodiment, the elastic member 300 is a torsion spring. The first limiting post 130 is disposed close to one of the limiting baffles 120, the second limiting post 220 is disposed close to the other limiting baffle 120, and the two ends of the elastic member 300 are respectively sleeved on the first limiting post 130 and the second limiting post 220. The above-described automatic locking device 10 sets the elastic member 300 as a torsion spring, which is convenient for installation. During installation, the two ends of the elastic member 300 are respectively sleeved on the first limiting post 130 and the second limiting post 220, and the first limiting post 130 is disposed close to one of the limiting baffles 120, and the second limiting post 220 is disposed close to the other limiting baffle 120. In this way, the smooth movement of the middle body of the torsion spring can be ensured, and the interference of the first limiting post 130 and the second limiting post 220 on the middle body of the torsion spring can be avoided.

[0046] In one embodiment, the main body member 100 further includes a guiding member 140. The guiding member 140 is disposed in the limiting through groove, the guiding member 140 is located between the relatively disposed limiting baffles 120 and is connected to the main body substrate 110. The guiding member 140 has a guiding surface perpendicular to the main body substrate 110, and the guiding surface is used to guide the elastic member 300. The above-described automatic locking device 10 sets the guiding member 140. The guiding surface of the guiding member 140 perpendicular to the main body substrate 110 can be used to guide the elastic member 300. The middle body of the torsion spring moves along with the extension of the movable extension plate 210. In order to avoid the deviation of the movement track of the torsion spring, the guiding surface is provided to help the torsion spring move along the correct track, ensuring the stability of the entire automatic locking device 10.

[0047] In one embodiment, refer to Figure 1 As shown, the guiding surface gradually approaches the limiting baffle 120 from the inside of the limiting through groove towards the port direction of the limiting through groove. Preferably, the guiding member 140 has a right trapezoidal structure, wherein the right-angle side of the guiding member 140 and the first limiting post 130 are on the same side and are both close to one of the limiting members, and the hypotenuse of the guiding member 140 forms the above-described guiding surface. The above-described automatic locking device 10 sets the guiding surface to gradually approach the limiting baffle 120 opposite to the guiding surface from the inside of the limiting through groove towards the port direction of the limiting through groove, which can ensure that when the middle body of the torsion spring moves to the port of the limiting through groove, it is clamped by the guiding surface and the limiting baffle 120, ensuring the stability of the automatic locking device 10 in the open state.

[0048] In one embodiment, refer to Figure 1 As shown, the relatively disposed limiting baffles 120 are respectively connected to the two side edges at the opposite positions of the main body substrate 110, so that two limiting through grooves are respectively formed between the relatively disposed limiting baffles 120 and the two surfaces of the main body substrate 110, and the movable extension member 200 and the elastic member 300 are respectively disposed in the two limiting through grooves.

[0049] In one embodiment, the automatic locking device 10 further includes a cover member 400. Each limiting through groove is respectively provided with a cover member 400, and the cover member 400 is connected to the main body member 100 for covering the limiting through groove.

[0050] In one embodiment, the cover member 400 includes a covering plate 410 and a connecting fixing plate 420. A plurality of connecting fixing plates 420 are connected to the covering plate 410. The connecting fixing plates 420 are arranged perpendicular to the covering plate 410. The covering plate 410 covers the oppositely arranged limiting baffles 120 and is connected to the limiting baffles 120. The above automatic locking device 10 is provided with the cover member 400, which can ensure that the movable extension plate 210 moves between the limiting through groove and the covering plate 410, preventing the movable extension plate 210 from detaching, and directly improving the working stability of the automatic locking device 10.

[0051] In one embodiment, the cover member 400 further includes a fastener 430. The connecting fixing plate 420 has a connecting through hole 421, and the limiting baffle 120 is provided with a limiting through hole 121 corresponding to the connecting through hole 421. The fastener 430 passes through the connecting through hole 421 and the limiting through hole 121 to realize the detachable connection between the covering plate 410 and the limiting baffle 120. The above automatic locking device 10 is provided with the fastener 430, and by setting the fastener 430 to pass through the connecting through hole 421 and the limiting through hole 121 to realize the detachable connection between the covering plate 410 and the limiting baffle 120, it is convenient for the disassembly and maintenance of the automatic locking device 10.

[0052] In one embodiment, the limiting through hole 121 and / or the connecting through hole 421 can be a threaded hole. Correspondingly, the fastener 430 is a fastening screw, and the fastening screw has an external thread. Preferably, both the limiting through hole 121 and the connecting through hole 421 are threaded holes.

[0053] In one embodiment, the connecting fixing plates 420 are distributed on opposite sides of the covering plate 410, and the connecting fixing plates 420 on each side of the covering plate 410 are spaced apart. The connecting fixing plates 420 on each side of the covering plate 410 of the above automatic locking device 10 are spaced apart, which can ensure that each part of the covering plate 410 can be connected to the limiting baffle 120.

[0054] In one embodiment, the main body substrate 110 is in the shape of a rectangular plate. Correspondingly, the limiting baffle 120 is in the shape of a rectangular plate. The length of the limiting baffle 120 is the same as that of the main body substrate 110. The width of the main body substrate 110 is greater than the height of the limiting baffle 120. The height of the limiting baffle 120 refers to the height of the limiting baffle 120 on the main body substrate 110. Correspondingly, the shape of the cover plate 410 is the same as that of the main body substrate 110. It can be understood that in other embodiments, the structure and shape of the main body substrate 110 are not limited to the above, and the structure and shape of the main body substrate 110 can also be in the shapes of an ellipse, a rounded rectangle, etc. Preferably, the length of the movable extension plate 210 is slightly less than or equal to the length of the main body substrate 110, and the width of the movable extension plate 210 is slightly less than the width of the main body substrate 110.

[0055] The above-mentioned automatic locking device 10 has a simple structure, low cost, and a wide range of applications. When the above-mentioned automatic locking device 10 is in use, the opening and closing states of the lock can be realized only by pushing and pulling operations, and the opening and closing are convenient. In the present invention, the movement track of the movable extension plate 210 is restricted by the limiting through groove and the elastic member 300. When the movable extension plate 210 is pushed, the movable extension plate 210 moves along the limiting through groove, and the movable extension plate 210 can perform an extending action to provide an "open" state. When the movable extension plate 210 is pushed reversely, the movable extension plate 210 resets and retracts into the limiting through groove to reach the "closed" state. The above-mentioned open state and closed state are both stable and easy to perform, realizing the bistable positions of the movable extension plate 210, and thus realizing the open or closed state of the lock. With one pulling action by the user, the automatic locking device 10 can be opened, that is, the movable extension plate 210 extends outwards, and at the same time, the position of the elastic member 300 is changed, and the resilience of the spring will maintain the movable extension plate 210 in the open state. Similarly, with one pushing action by the user, the automatic locking device 10 can be closed, and the elastic member 300 can maintain the movable extension plate 210 in the closed state.

[0056] Another embodiment of the present invention further provides a watch band assembly.

[0057] A watch band assembly includes a first watch band, a second watch band, and the above-mentioned automatic locking device 10. The main body substrate 110 of the automatic locking device 10 is connected to the first watch band, and the movable extension plate 210 is connected to the second watch band. When the automatic locking device 10 has two movable extension members 200, the first watch band and the second watch band are respectively connected to the movable extension plates 210 of the two movable extension members 200. In the drawings, the watch band assembly, the first watch band, and the second watch band are not shown. Preferably, the preparation materials of the first watch band, the second watch band, and the above-mentioned automatic locking device 10 can be metals, alloys, etc.

[0058] Preferably, the main body substrate 110 of the automatic locking device 10 is hinged to the first watch band, and the movable extension plate 210 is hinged to the second watch band.

[0059] The above-mentioned watch band assembly has a simple structure, low cost, and wide application range. As long as a pushing and pulling operation is performed, the opening and closing state of the buckle on the watch band assembly can be achieved, and the opening and closing are convenient. With one pulling action by the user, the automatic buckle device 10 can be opened, that is, the movable extension plate 210 extends outwards, and at the same time, the position of the elastic member 300 is changed. The resilience of the spring will maintain the movable extension plate 210 in the open state.

[0060] Another embodiment of the present invention also provides a watch.

[0061] A watch includes a watch dial body and the above-mentioned watch band assembly. The first watch band and the second watch band are respectively connected to the watch dial body. In the drawings, the watch dial body and the above-mentioned watch band assembly are not shown.

[0062] For the above-mentioned watch, by providing a watch band assembly containing an automatic buckle device 10, as long as a pushing and pulling operation is performed, the opening and closing state of the buckle on the watch band assembly can be achieved, and the opening and closing are convenient and the use is convenient.

[0063] It is not difficult to understand that the automatic buckle device 10 of the present invention can also be used for the connection between any two objects.

[0064] The technical features of the above-mentioned embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0065] The above-mentioned embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it cannot be understood as a limitation on the scope of the invention patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the invention patent of the present invention should be subject to the appended claims.

Claims

1. An automatic locking device, characterized in that, It includes a main body component, a movable extension component, and an elastic component. The main body component includes a main body substrate and a limit baffle. The limit baffles are respectively connected to two opposite sides of the main body substrate. A limit through groove is formed between the oppositely arranged limit baffles and the main body substrate. The movable extension component is arranged in the limit through groove. The movable extension component has a movable extension plate which is located in the limit through groove. The elastic component is located in the limit through groove and both ends of the elastic component are respectively connected to the main body substrate and the surface of the movable extension plate facing the substrate. When the movable extension plate is pushed, the movable extension plate can move along the extension direction of the limit through groove.

2. The automatic locking device according to claim 1, wherein, The main body component further includes a first limit post. The first limit post is arranged in the limit through groove, located between the oppositely arranged limit baffles and connected to the main body substrate. One end of the elastic component is connected to the first limit post.

3. The automatic locking device according to claim 2, wherein, The movable extension component further includes a second limit post. The second limit post is arranged in the limit through groove. The second limit post is connected to the surface of the movable extension plate facing the substrate. The other end of the elastic component is connected to the second limit post.

4. The automatic locking device according to claim 3, wherein, The elastic component is a torsion spring. The first limit post is arranged close to one of the limit baffles. The second limit post is arranged close to the other limit baffle. Both ends of the elastic component are respectively sleeved on the first limit post and the second limit post.

5. The automatic locking device according to claim 4, wherein, The main body component further includes a guiding member. The guiding member is arranged in the limit through groove, located between the oppositely arranged limit baffles and connected to the main body substrate. The guiding member has a guiding surface perpendicular to the main body substrate, and the guiding surface is used to guide the movement of the elastic component.

6. The automatic locking device according to claim 5, wherein, The guiding surface gradually approaches the limit baffle from the inside of the limit through groove towards the port direction of the limit through groove.

7. The automatic locking device according to any one of claims 1-6, characterized in that, Two limit through grooves are respectively formed between the two surfaces of the oppositely arranged limit baffles and the main body substrate. The movable extension component and the elastic component are respectively arranged in the two limit through grooves.

8. The automatic locking device according to claim 7, characterized in that, The automatic locking device further includes a cover body component. The cover body component is correspondingly arranged for each limit through groove. The cover body component is connected to the main body component to cover the corresponding limit through groove.

9. The automatic locking device according to claim 8, characterized in that, The cover body component includes a covering plate and connecting fixing plates. A plurality of connecting fixing plates are connected to the covering plate. The connecting fixing plates are arranged perpendicular to the covering plate. The covering plate covers the oppositely arranged limit baffles and is connected to the limit baffles.

10. The automatic locking device according to claim 9, characterized in that, The cover body component further includes a fastener. The connecting fixing plate has a connecting through hole. A limit through hole corresponding to the connecting through hole is arranged on the limit baffle. The fastener passes through the connecting through hole and the limit through hole to realize the detachable connection between the covering plate and the limit baffle.

11. The automatic locking device according to claim 9, characterized in that, The connecting fixing plates are distributed on two opposite sides of the covering plate, and the connecting fixing plates on each side of the covering plate are distributed at intervals.

12. A watch band assembly, characterized in that, Comprising a first watch band, a second watch band, and the automatic buckle device according to any one of claims 1-11, wherein the main body substrate of the automatic buckle device is connected to the first watch band, and the movable extension plate is connected to the second watch band; When the automatic buckle device has two said movable extension members, the first watch band and the second watch band are respectively connected to the movable extension plates of the two said movable extension members.

13. A watch, characterized in that, Comprising a watch face main body and the watch band assembly according to claim 12, wherein the first watch band and the second watch band are respectively connected to the watch face main body.

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