Buckle connecting device capable of elastically resetting

The vertical interlocking buckle system with detection feedback addresses the two-handed operation and connection status ambiguity of child safety seat buckles, enabling single-handed operation and reliable locking with visual and auditory confirmation.

CN223094934UActive Publication Date: 2025-07-15SUNNYLOVE BABY PRODUCTS ZHUHAI CO LTD
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Patent Information

Application Number
CN202422081426.6
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-08-26
Publication Date
2025-07-15
Estimated Expiration
2034-08-26

AI Technical Summary

Technical Problem

The existing children's buckles are inconvenient to operate and cannot accurately detect the connection status, which poses safety hazards.

Method used

The upper and lower clasping method is used to achieve automatic locking of the right connector and the left connector. Combined with the left and right locking components and the upper and lower locking components, it is automatically locked through the elastic structure and equipped with detection components to ensure reliable status.

Benefits of technology

It realizes stable and reliable connections for one-hand operation, and provides intuitive connection status feedback through the detection components to ensure safe use.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a buckle connecting device capable of resetting elastically, which is characterized in that a right connecting piece and a left connecting piece are connected in an up-and-down buckling mode instead of a relative insertion mode, that is, the right connecting piece and the left connecting piece are automatically locked and pulled out in the left-and-right direction during the up-and-down buckling connection. And the right connecting piece and the left connecting piece are kept in an up-down buckling locking state through an up-down locking assembly capable of elastically and automatically locking, so that during use, the right connecting piece and the left connecting piece are subjected to interlocking locking structures arranged in the left-right direction and the up-down direction which are perpendicular to each other; and the left-right connection state is more stable and reliable after the right connecting piece and the left connecting piece are buckled up and down.
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Description

Technical Field

[0001] The utility model relates to a snap connection device capable of elastic reset.

Background Art

[0002] Some components on children's products such as baby strollers, child safety seats, and infant carriers usually need to be connected or maintained in a certain state through fasteners. For example, after a child sits in a child safety seat, a five-point seat belt is used to restrain the child. And to prevent the left and right shoulder straps from slipping off the child's shoulders, a shoulder strap fixator is needed to connect the left and right shoulder straps together. When the child does not use the safety seat, the shoulder strap fixator needs to be unfastened first. Such usage scenarios can be achieved through fasteners for this variable-state connection.

[0003] Generally, most fasteners are safety buckles of the plug-and-unplug type. This type of plug-and-unplug safety buckle has a male buckle protrusion and a female buckle recess. Users need to use both hands to align the cooperating male and female buckles and insert them relatively to lock for safe connection; when disconnecting, an external force needs to be applied to squeeze the male buckle protrusion, and both hands need to apply force to release the connection state of the male and female buckles. However, in reality, users often need to hold a child with one hand and operate the safety buckle with the other hand. Therefore, this type of plug-and-unplug safety buckle is relatively inconvenient to operate and cannot meet the user-friendly usage requirements in various scenarios.

[0004] In addition, the fasteners seen on the market only have a connection function. Users can only judge whether the fastener is firmly connected or detached by visual observation, which cannot accurately understand whether the fastener is in the buckled state or the detached state, and there are defects of potential misuse safety hazards and inconvenient use.

[0005] Therefore, the present utility model is studied and proposed in view of the above problems.

Content of the Utility Model

[0006] The purpose of the present utility model is to overcome the deficiencies of the prior art and provide a snap connection device capable of elastic reset. The right connector and the left connector are not connected by a relative insertion method, but by an up-and-down buckling method. That is, when connected by up-and-down buckling, the functions of automatically locking the left and right pulling of the right connector and the left connector are realized, and then through an up-and-down locking component that can be elastically and automatically locked, the right connector and the left connector are kept in an up-and-down buckled locked state. Therefore, when in use, the right connector and the left connector are subject to an interlocking and locking structure arranged in two mutually perpendicular directions of left-right and up-down, making the left-right connection state more stable and reliable after the right connector and the left connector are buckled up and down.

[0007] The present utility model is realized through the following technical solutions:

[0008] A snap - connection device with elastic reset, comprising a right connecting member 1 and a left connecting member 2;

[0009] A left - right locking assembly 3 is provided between the right connecting member 1 and the left connecting member 2, which can be buckled up and down to lock the right connecting member 1 and the left connecting member 2 left - right;

[0010] A up - down locking assembly 4 is also provided between the right connecting member 1 and the left connecting member 2. When the left - right locking assembly 3 locks the right connecting member 1 and the left connecting member 2 left - right, the up - down locking assembly 4 is used to lock the right connecting member 1 and the left connecting member 2 up - down, and the up - down locking assembly 4 is configured to elastically and automatically lock the right connecting member 1 and the left connecting member 2 up - down;

[0011] An up - down unlocking mechanism 40 for linking the unlocking action of the up - down locking assembly 4 is movably provided on the right connecting member 1 or the left connecting member 2.

[0012] For the snap - connection device with elastic reset as described above, the left - right locking assembly 3 includes a left - right locking recess 31 provided on the right connecting member 1 or the left connecting member 2, and a corresponding left - right locking protrusion 32 provided on the left connecting member 2 or the right connecting member 1, which can be buckled into the left - right locking recess 31 to lock the right connecting member 1 and the left connecting member 2 left - right while buckling up and down.

[0013] For the snap - connection device with elastic reset as described above, it further includes a left - right unlocking mechanism 33 for driving the left - right locking protrusion 32 to automatically withdraw from the left - right locking recess 31 when the up - down locking assembly 4 is in the unlocked state.

[0014] For the snap - connection device with elastic reset as described above, the left - right unlocking mechanism 33 includes a left - right unlocking push member 331 slidably provided on the right connecting member 1, and a left - right unlocking elastic member 332 located between the left - right unlocking push member 331 and the right connecting member 1 for driving the left - right unlocking push member 331 to slide correspondingly relative to the right connecting member 1.

[0015] For the snap - connection device with elastic reset as described above, the up - down locking assembly 4 includes an up - down locking hole 41 provided on the right connecting member 1 or the left connecting member 2, and an up - down locking member 42 slidably provided on the left connecting member 2 or the right connecting member 1 correspondingly and capable of being inserted into the up - down locking hole 41 for locking; the up - down locking assembly 4 further includes an up - down locking reset member 43 for driving the up - down locking member 42 to elastically reset. When the left - right locking assembly 3 locks the right connecting member 1 and the left connecting member 2 left - right, the up - down locking member 42 is driven by the up - down locking reset member 43 to act correspondingly, so that the locking end of the up - down locking member 42 automatically inserts into the up - down locking hole 41; the up - down locking member 42 is configured to be linked to the corresponding unlocking action by the up - down unlocking mechanism 40.

[0016] As described above, a snap connection device with elastic reset function, two of the upper and lower locking holes 41 are provided on the left connector 2 at intervals; the upper and lower locking members 42 include upper and lower locking blocks 421 that are locked and matched with the corresponding upper and lower locking holes 41, and upper and lower connecting blocks 422 that are respectively connected and fixed to the two upper and lower locking blocks 421. The upper and lower locking reset members 43 are located between each upper and lower locking block 421 and the right connector 1; or the upper and lower locking reset members 43 are located between the upper and lower connecting blocks 422 and the right connector 1.

[0017] As described above, a snap connection device with elastic reset function, the right connector 1 is provided with a guiding chute 44 for guiding the corresponding upper and lower locking blocks 421 to slide therein.

[0018] As described above, a snap connection device with elastic reset function, further includes a detection component 5 for detecting the buckling state of the right connector 1 and the left connector 2.

[0019] As described above, a snap connection device with elastic reset function, the detection component 5 includes a control circuit board 51 provided on the right connector 1, a detection sensor 52 connected to the control circuit board 51, and a magnetic member 53 provided on the left connector 2 and used in cooperation with the detection sensor 52. When the right connector 1 and the left connector 2 are disengaged, the magnetic field around the detection sensor 52 changes from strong to weak, causing the detection sensor 52 to generate a corresponding signal.

[0020] As described above, a snap connection device with elastic reset function, the right connector 1 is provided with a storage battery 54 electrically connected to the control circuit board 51; or the control circuit board 51 is electrically connected to the locomotive power supply through a connecting wire.

[0021] Compared with the prior art, the present utility model has the following advantages:

[0022] 1. When the user operates the upper and lower buckling of the left and right locking components to lock the right connector and the left connector left and right, the upper and lower locking components automatically and elastically lock the right connector and the left connector up and down. The locking action of the upper and lower locking components can be realized without additional operation by the user. Therefore, the present utility model can realize the left and right locking and the up and down locking states of the snap connection device with only one locking action, with simple operation, reliable locking, and reasonable design.

[0023] 2. In the utility model, the left connecting piece of the utility model realizes the function of automatically locking and pulling out the right connecting piece with the left connecting piece by buckling the left and right locking protrusions into the left and right locking recesses of the right connecting piece; when the right connecting piece and the left connecting piece are buckled up and down, the locking ends of the upper and lower locking pieces are accurately aligned with the upper and lower locking holes, and the upper and lower locking reset pieces drive the upper and lower locking pieces to automatically insert into the upper and lower locking holes, so that the right connecting piece and the left connecting piece maintain a locked state of buckling up and down. That is, at this time, using external force to separate the upper and lower buckled states of the right connecting piece and the left connecting piece will be restricted by the locking ends of the upper and lower locking pieces and cannot separate their upper and lower buckled states, and it is also impossible to pull the connection state of the right connecting piece and the left connecting piece apart left and right. Therefore, the right connecting piece and the left connecting piece are interlocked and locked by the structure arranged in two mutually perpendicular directions of left and right and up and down, so that the left and right connection state of the right connecting piece and the left connecting piece after being buckled up and down is more stable and reliable.

[0024] 3. The right connecting member or the left connecting member is movably provided with an upper and lower releasing mechanism for linking the unlocking action of the upper and lower locking components. When the right connecting member and the left connecting member are in an upper and lower buckled state, the locking ends of the upper and lower locking members are inserted into the upper and lower locking holes. At this time, the upper and lower releasing mechanisms are moved by one hand to overcome the elastic force of the upper and lower locking reset members, so that the locking ends of the upper and lower locking members that can slide left and right are disengaged from the upper and lower locking holes to release the upper and lower buckled locking state. At this moment, under the action of the left and right releasing mechanisms, the right connecting member and the left connecting member are separated from the upper and lower directions, so that the left and right connected locking state of the right connecting member and the left connecting member is easily released. Therefore, the utility model has the characteristics of convenient one-handed operation and easy and convenient operation.

[0025] 4. The utility model also includes a detection component for detecting the buckled state of the right connecting member and the left connecting member. When the right connecting member and the left connecting member are buckled together up and down and the upper and lower locking members are inserted into the upper and lower locking holes, the maximum magnetic flux is generated around the detection component. At this time, the detection component transmits a safe connection signal to the outside (through a green light flashing signal or a voice broadcast signal set on the car seat, and can also receive signal feedback through a mobile terminal), indicating that the right connecting member and the left connecting member are in a locked state in the left and right and up and down directions, so that the user can intuitively and accurately grasp the connection state of the snap connection device to ensure safe and reliable use.

Brief Description of the Drawings

[0026] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:

[0027] Figure 1 It is a three-dimensional diagram of the utility model.

[0028] Figure 2 It is a top view of the utility model.

[0029] Figure 3It is the bottom view of the present utility model.

[0030] Figure 4 It is one of the structural schematic diagrams of the present utility model.

[0031] Figure 5 It is the second structural schematic diagram of the present utility model.

[0032] Figure 6 It is the structural schematic diagram of the right connecting member in the present utility model.

[0033] Figure 7 It is the structural schematic diagram of the left connecting member in the present utility model.

[0034] Figure 8 It is the structural schematic diagram of the detection component in the present utility model.

[0035] Figure 9 It is the exploded view of the present utility model.

[0036] Figure 10 It is the schematic diagram of the use state when the seat belt is connected to the present utility model.

Detailed implementation manners

[0037] The following will make a detailed description of the implementation manners of the present utility model with reference to the accompanying drawings.

[0038] As Figures 1-10 shown, a snap connection device with elastic reset of the present utility model includes a right connecting member 1 and a left connecting member 2; a left - right locking assembly 3 is provided between the right connecting member 1 and the left connecting member 2, which can be buckled up and down to lock the right connecting member 1 and the left connecting member 2 left - right; a up - down locking assembly 4 is further provided between the right connecting member 1 and the left connecting member 2, which is used to lock the right connecting member 1 and the left connecting member 2 up - down when the left - right locking assembly 3 locks the right connecting member 1 and the left connecting member 2 left - right, and the up - down locking assembly 4 is configured to automatically lock the right connecting member 1 and the left connecting member 2 up - down elastically; an up - down unlocking mechanism 40 for linking the unlocking action of the up - down locking assembly 4 is movably provided on the right connecting member 1 or the left connecting member 2. When operating the left - right locking assembly to buckle up and down to lock the right connecting member and the left connecting member left - right, the up - down locking assembly automatically locks the right connecting member and the left connecting member up - down elastically. Without additional operation by the user, the locking action of the up - down locking assembly can be realized. Therefore, the present utility model can achieve the left - right locking and up - down locking states of the snap connection device with only one locking action, with simple operation, reliable locking and reasonable design.

[0039] The left connecting piece of the utility model realizes the function of automatically locking and pulling out the right connecting piece with the left connecting piece by buckling the left and right locking protrusions into the left and right locking recesses of the right connecting piece; when the right connecting piece and the left connecting piece are buckled up and down, the locking ends of the upper and lower locking pieces are accurately aligned with the upper and lower locking holes, and the upper and lower locking reset pieces drive the upper and lower locking pieces to automatically insert into the upper and lower locking holes, so that the right connecting piece and the left connecting piece maintain a locked state of buckling up and down. That is, at this time, using external force to separate the upper and lower buckled states of the right connecting piece and the left connecting piece will be restricted by the locking ends of the upper and lower locking pieces and cannot separate their upper and lower buckled states, and it is also impossible to pull the connection state of the right connecting piece and the left connecting piece apart left and right. Therefore, the right connecting piece and the left connecting piece are interlocked and locked by the structure arranged in two mutually perpendicular directions of left and right and up and down, so that the left and right connection state of the right connecting piece and the left connecting piece after being buckled up and down is more stable and reliable. In addition, by applying force with one hand to move the upper and lower locking release mechanisms, the elastic force of the upper and lower locking reset parts can be overcome, so that the locking ends of the upper and lower locking parts that can slide left and right can be disengaged from the upper and lower locking holes to release the upper and lower buckled locking state. At this time, under the action of the left and right locking release mechanisms, the right connecting part and the left connecting part are separated from the upper and lower directions, so that the left and right connection locking state of the right connecting part and the left connecting part can be easily released. Therefore, the utility model has the characteristics of convenient one-handed operation and easy and convenient operation.

[0040] In order to ensure reliable connection and locking, the left and right locking components 3 include left and right locking recesses 31 provided on the right connecting member 1 or the left connecting member 2 and left and right locking protrusions 32 correspondingly provided on the left connecting member 2 or the right connecting member 1 and capable of being buckled into the left and right locking recesses 31 so that the right connecting member 1 and the left connecting member 2 are locked left and right and buckled up and down.

[0041] like Figure 6 , 9 As shown, it also includes a left and right release mechanism 33 for driving the left and right locking protrusions 32 to automatically withdraw from the left and right locking recesses 31 when the upper and lower locking components 4 are in the unlocked state. The left and right release mechanism 33 includes a left and right release pusher 331 slidably disposed on the right connecting member 1 and a left and right release elastic member 332 located between the left and right release pusher 331 and the right connecting member 1 for driving the left and right release pusher 331 to slide correspondingly relative to the right connecting member 1. When the upper and lower release mechanism is toggled to overcome the elastic force of the upper and lower locking reset member, the locking end of the upper and lower locking member that can slide left and right is separated from the upper and lower locking holes to release the upper and lower buckled locking state. At this time, the left and right release elastic member 332 is elastically reset to drive the left and right release pusher 331 to push the left and right connecting member to separate from the upper and lower parts, and at the same time, the left and right locking protrusions 32 automatically withdraw from the left and right locking recesses 31, so that the left and right connection locking state of the right and left connecting members is easily released, and the left and right connection locking state is automatically unlocked.

[0042] In order to ensure reliable connection and locking, the upper and lower locking assembly 4 includes upper and lower locking holes 41 provided on the right connecting member 1 or the left connecting member 2, and upper and lower locking members 42 slidably provided on the left connecting member 2 or the right connecting member 1 correspondingly and capable of being inserted into the upper and lower locking holes 41 for locking; the upper and lower locking assembly 4 further includes upper and lower locking return members 43 for driving the upper and lower locking members 42 to elastically reset. When the left and right locking assemblies 3 lock the right connecting member 1 and the left connecting member 2 left and right, the upper and lower locking members 42 are driven by the upper and lower locking return members 43 to act correspondingly, so that the locking ends of the upper and lower locking members 42 automatically insert into the upper and lower locking holes 41; the upper and lower locking members 42 are configured to be unlocked correspondingly by being linked by the upper and lower unlocking mechanism 40. Among them, the upper and lower unlocking mechanism 40 can be an upper and lower unlocking member fixedly connected to the upper and lower locking members 42.

[0043] In order to make the upper and lower connection locking structure more stable and reliable, the two upper and lower locking holes 41 are provided on the left connecting member 2 at intervals; the upper and lower locking members 42 include upper and lower locking blocks 421 that are in locking cooperation with the corresponding upper and lower locking holes 41, and upper and lower connecting blocks 422 respectively connected and fixed to the two upper and lower locking blocks 421. The upper and lower locking return members 43 are located between each upper and lower locking block 421 and the right connecting member; or the upper and lower locking return members 43 are located between the upper and lower connecting blocks 422 and the right connecting member 1.

[0044] As Figure 6 shown, in order to make the upper and lower locking blocks 421 slide stably and smoothly along the set direction, a guiding chute 44 for guiding the corresponding upper and lower locking blocks 421 to slide therein is provided on the right connecting member 1.

[0045] As Figures 3-6 shown in FIGS. 8 and 9, a receiving cavity 10 is provided on the right connecting member 1. An end cover 101 is connected to the mouth of the receiving cavity 10. The left and right locking recesses 31 and the upper and lower locking members 42 are both located inside the receiving cavity 10, which can prevent the left and right locking recesses and the upper and lower locking members from being interfered and damaged by external objects, so that it can play a certain protective role in the left and right locking recesses and the upper and lower locking members, extend their service life, and reduce the maintenance and replacement cost; at the same time, it can also make the buckle connection device structure more concise and beautiful.

[0046] As Figure 1 shown in FIGS. 2 8, 9, in order to facilitate operation, a window 102 communicating with the receiving cavity 10 is provided on the right connecting member 1, and the operating end of the upper and lower unlocking mechanism 40 passes through the window 102 and is externally disposed. In some embodiments, the operating end of the upper and lower unlocking member abuts against the corresponding side wall of the window to know whether the upper and lower locking members are in the locked state or the unlocked state, or whether the locking end of the upper and lower locking members is completely inserted into or withdrawn from the upper and lower locking holes, ensuring reliable locking and convenient use.

[0047] As Figure 8, 9 As shown, it further includes a detection component 5 for detecting the buckling state of the right connecting member 1 and the left connecting member 2, enabling it to have the function of intelligent detection, facilitating the user to intuitively understand the usage state of the snap connection device, and ensuring safer, more reliable and convenient use.

[0048] Such as Figure 8 , 9 As shown, the detection component 5 includes a control circuit board 51 provided on the right connecting member 1, a detection sensor 52 connected to the control circuit board 51, and a magnetic member 53 provided on the left connecting member 2 and cooperating with the detection sensor 52. When the right connecting member 1 and the left connecting member 2 are disengaged, the magnetic field around the detection sensor 52 changes from strong to weak, causing the detection sensor 52 to generate a corresponding signal. After the signal processing module of the control circuit board 51 receives the signal generated by the detection sensor 52 and processes it, a corresponding warning is sent to the user through the mobile terminal. Preferably, the detection sensor 52 is a Hall sensor.

[0049] Such as Figure 6 , 9 As shown, a storage battery 54 electrically connected to the control circuit board 51 is provided on the right connecting member 1. In some embodiments, the control circuit board 51 is electrically connected to the locomotive power supply through a connecting wire.

[0050] For convenient installation, an embedding groove for embedding the magnetic member 53 is provided on the left connecting member 2.

Claims

1. A snap connection device with elastic reset, characterized in that It includes a right connecting member (1) and a left connecting member (2); A left - right locking assembly (3) is provided between the right connecting member (1) and the left connecting member (2), which can be buckled up and down to lock the right connecting member (1) and the left connecting member (2) left - right; A up - down locking assembly (4) is also provided between the right connecting member (1) and the left connecting member (2). When the left - right locking assembly (3) locks the right connecting member (1) and the left connecting member (2) left - right, the up - down locking assembly (4) is used to lock the right connecting member (1) and the left connecting member (2) up - down, and the up - down locking assembly (4) is configured to elastically and automatically lock the right connecting member (1) and the left connecting member (2) up - down; An up - down unlocking mechanism (40) for linking the unlocking action of the up - down locking assembly (4) is movably provided on the right connecting member (1) or the left connecting member (2).

2. The snap connection device capable of elastic reset according to claim 1, wherein The left - right locking assembly (3) includes left - right locking recesses (31) provided on the right connecting member (1) or the left connecting member (2), and corresponding left - right locking protrusions (32) provided on the left connecting member (2) or the right connecting member (1) that can be buckled into the left - right locking recesses (31) to lock the right connecting member (1) and the left connecting member (2) left - right and buckle up and down.

3. The snap connection device capable of elastic reset according to claim 2, wherein It also includes a left - right unlocking mechanism (33) for driving the left - right locking protrusions (32) to automatically withdraw from the left - right locking recesses (31) when the up - down locking assembly (4) is in the unlocked state.

4. The snap connection device capable of elastic reset according to claim 3, characterized in that The left - right unlocking mechanism (33) includes a left - right unlocking push member (331) slidably provided on the right connecting member (1) and a left - right unlocking elastic member (332) located between the left - right unlocking push member (331) and the right connecting member (1) for driving the left - right unlocking push member (331) to slide correspondingly relative to the right connecting member (1).

5. A snap connection device capable of elastic reset according to any one of claims 1-4, characterized in that The up - down locking assembly (4) includes up - down locking holes (41) provided on the right connecting member (1) or the left connecting member (2), and up - down locking members (42) slidably provided correspondingly on the left connecting member (2) or the right connecting member (1) that can be inserted into the up - down locking holes (41) for locking; the up - down locking assembly (4) also includes an up - down locking reset member (43) for driving the up - down locking member (42) to elastically reset. When the left - right locking assembly (3) locks the right connecting member (1) and the left connecting member (2) left - right, the up - down locking member (42) is driven by the up - down locking reset member (43) to act correspondingly, so that the locking end of the up - down locking member (42) automatically inserts into the up - down locking hole (41); the up - down locking member (42) is configured to be linked to perform the corresponding unlocking action by the up - down unlocking mechanism (40).

6. The snap - connection device capable of elastic reset according to claim 5, characterized in that The two up - down locking holes (41) are spacedly provided on the left connecting member (2); the up - down locking member (42) includes up - down locking blocks (421) that are in locking cooperation with the corresponding up - down locking holes (41) and up - down connecting blocks (422) respectively connected and fixed to the two up - down locking blocks (421), and the up - down locking reset member (43) is located between each up - down locking block (421) and the right connecting member (1); Or the up - down locking reset member (43) is located between the up - down connecting block (422) and the right connecting member (1).

7. The snap connection device capable of elastic reset according to claim 6, characterized in that The right connecting member (1) is provided with a guiding chute (44) for guiding the corresponding upper and lower locking blocks (421) to slide therein.

8. The snap connection device capable of elastic reset according to claim 1, wherein It further includes a detection assembly (5) for detecting the buckling state of the right connecting member (1) and the left connecting member (2).

9. The snap connection device capable of elastic reset according to claim 8, characterized in that The detection assembly (5) includes a control circuit board (51) provided on the right connecting member (1), a detection sensor (52) connected to the control circuit board (51), and a magnetic member (53) provided on the left connecting member (2) and cooperating with the detection sensor (52). When the right connecting member (1) and the left connecting member (2) are disengaged, the magnetic field around the detection sensor (52) changes from strong to weak, causing the detection sensor (52) to generate a corresponding signal.

10. The snap connection device capable of elastic reset according to claim 9, wherein The right connecting member (1) is provided with a storage battery (54) electrically connected to the control circuit board (51); or the control circuit board (51) is electrically connected to the locomotive power supply through a connecting wire.