Composite magnetic type pressing anti-pulling and anti-hanging device

Abstract

The utility model relates to the technical field of cable pulling and hanging prevention, in particular to a composite magnetic type pressing pulling and hanging prevention device, which comprises at least one unit device, and the unit device comprises a shell which is arranged on a matched vehicle body or equipment of a charging cable; the mounting hole is formed in the side wall of the shell; the magnetic type buckle head is arranged in the shell and partially extends out of the shell through the mounting hole; the bandage is provided with a fixed end and a movable end and is arranged on a vehicle body or equipment matched with the charging cable, and the fixed end of the bandage and the shell are located on the two sides of the charging cable respectively; and the magnetic type buckle seat is arranged at the movable end of the bandage. According to the utility model, the bandages covering the two sides of the charging cable are mutually clamped together through the magnetic attraction matching and pressing of the magnetic attraction type buckle seat and the magnetic attraction type buckle head, so that the operation efficiency and safety of binding the charging cable are greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of cable anti-snagging technology, and in particular to a composite magnetic press-type anti-snagging device. Background Technology

[0002] Current anti-snag technology typically uses a combination of a seatbelt socket and a seatbelt insert. The seatbelt insert is fixed to the cable connector, while the seatbelt socket is fixed to the power vehicle's body. When the charging cable needs to be retracted, the seatbelt insert is inserted into the seatbelt socket. Because the seatbelt socket contains a sensor, when the sensor detects the insert, it indicates that the cable has been successfully retracted, thus achieving the anti-snag function—preventing the charging cable from snagging with the aircraft, ensuring the safety of charging personnel and equipment, and avoiding safety hazards caused by incomplete cable retraction.

[0003] However, the current technology still has many shortcomings: First, when the charging cable needs to be retracted, inserting the seatbelt insert into the seatbelt socket requires the plug end of the charging cable to be very close to the socket. Furthermore, the seatbelt insert is thin, and the socket opening is small, making insertion difficult and increasing the complexity of both inserting the insert and retracting the cable. Second, removing the seatbelt insert requires the operator to press the unlock button on the seatbelt socket firmly with their thumb. This requires both the insertion direction of the seatbelt socket and sufficient pressing depth for the insert to unlock. Simultaneously, the operator must continue pulling the insert out while maintaining the insertion direction. Since the seatbelt insert is fixed to the charging cable plug end, and current charging cables often weigh tens of kilograms per meter, these operational difficulties cause significant inconvenience for the operator.

[0004] Furthermore, the seatbelt clip is attached to the end of the charging cable. When using the charging cable, the seatbelt clip may swing unpredictably, potentially hitting the charging operator or the aircraft fuselage. Therefore, the aforementioned complex operation of the existing technology, on the one hand, directly reduces the efficiency of retrieval and use of the charging cable due to its complexity and difficulty; on the other hand, it can easily cause safety problems for charging operators and equipment, such as sprained fingers of operators or scratches to the aircraft fuselage caused by the seatbelt clip or the charging cable.

[0005] Therefore, this utility model provides a composite magnetic suction type press-to-prevent hanging device. Utility Model Content

[0006] In view of the above-mentioned shortcomings and deficiencies of the existing technology, this utility model provides a composite magnetic press-type anti-pull device to solve the technical problems of high operation difficulty, low operation efficiency and certain safety hazards in the recycling and use of existing charging cables.

[0007] To achieve the above objectives, this utility model provides a composite magnetic press-type anti-pull device, comprising: at least one unit device, the unit device comprising: a housing, disposed on the vehicle body or equipment associated with the charging cable; a mounting hole, formed on the side wall of the housing; a magnetic buckle head, disposed inside the housing and partially protruding outside the housing through the mounting hole; a strap, having a fixed end and a movable end, and disposed on the vehicle body or equipment associated with the charging cable, wherein the fixed end of the strap and the housing are respectively located on both sides of the charging cable; and a magnetic buckle seat, disposed on the movable end of the strap.

[0008] Optionally, the unit device may also include: a prompting component, disposed within the housing, which outputs a normally closed signal when the magnetic latch seat and the magnetic latch head are engaged; or, outputs a normally open signal when the magnetic latch seat and the magnetic latch head are disengaged.

[0009] Optional, the prompting components include: a detection switch, located on the back of the magnetic snap-fit ​​head and electrically connected to an external controller; and a prompter, inserted into the housing and electrically connected to the external controller.

[0010] Alternatively, the indicator may be at least one of a display screen, a speaker, or an indicator light.

[0011] Optionally, the unit may also include a sliding assembly disposed on the side of the housing, with the side facing the vehicle body or equipment that is compatible with the charging cable.

[0012] Optionally, the sliding components include: a slide rail, which is disposed on the side of the vehicle body or device to which the charging cable is mounted; and a slider, which is disposed on the side of the slide rail and is slidably connected to the slide rail.

[0013] Optionally, the housing is tilted and positioned on the side of the vehicle body or device to which the charging cable is attached, so that the unit can slide along the tilting direction of the housing when the magnetic buckle seat and the magnetic buckle head are engaged with each other.

[0014] Optionally, an elastic band is provided as part of the strap, which adapts to the length of the strap as the unit slides along the inclined direction of the housing.

[0015] Alternatively, in the case of two unit devices: the housings of the two unit devices are tilted in opposite directions, and when the magnetic snap-fit ​​seat and the magnetic snap-fit ​​head are engaged with each other, the two unit devices slide away from each other along the tilt direction of the housing.

[0016] Optionally, in the case of two unit devices, it also includes: a guide post, which is disposed between the two unit devices and connected to the inside of the housing of each unit device; and a tightening spring, which is sleeved on the outside of the guide post, so that when the magnetic snap-fit ​​seat and the magnetic snap-fit ​​head are disengaged, the two unit devices slide along the inclined direction of the housing and move closer to each other.

[0017] The beneficial effects of this utility model are:

[0018] This invention provides a composite magnetic press-type anti-snagging device. A housing is installed on the vehicle body or equipment to which the charging cable is attached, and a magnetic buckle head is installed inside the housing. A portion of the magnetic buckle head extends out of the housing, and this extended portion engages with a magnetic buckle base. This allows the straps covering both sides of the charging cable to be secured by the magnetic buckle base and the magnetic buckle head, further aided by the pressing action on the magnetic buckle base. Because the magnetic buckle base and the magnetic buckle head engage with each other using magnetic force, achieving 360° omnidirectional engagement, this magnetic engagement effectively solves the problem of difficult connection between existing seatbelt inserts and slots, eliminating the need for unidirectional insertion, removal, or pressing. Therefore, it significantly improves the efficiency of charging cable retrieval and strap release, while ensuring the safety of the charging cable during these processes.

[0019] Furthermore, because the movable end of the strap is equipped with a magnetic buckle, it possesses magnetic attraction. Therefore, during the charging operation, the movable end of the strap can be directly magnetically attached to the vehicle body or equipment associated with the charging cable. This expands the position of the movable end of the strap from a fixed position in existing technology to any location on the vehicle body or equipment associated with the charging cable. This design provides significant convenience to charging operators, balancing convenience and safety, and effectively avoiding the safety hazard caused by the safety belt insert being attached to the end of the charging cable in existing technology, which could lead to the safety belt insert swinging unpredictably. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the composite magnetic press-type anti-pull hanging device of this utility model;

[0021] Figure 2 This is a schematic diagram of the overall structure of one unit device of this utility model;

[0022] Figure 3 This is a schematic diagram of the composite magnetic press-type anti-pull hanging device of this utility model installed on the side of the power supply vehicle;

[0023] Figure 4 for Figure 3 Enlarged structural diagram at point A;

[0024] Figure 5 This is a structural schematic diagram of the composite magnetic press-type anti-pull hanging device of this utility model from another angle.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Unit device; 2. Housing; 3. Mounting hole; 4. Magnetic buckle head; 5. Strap; 51. Elastic band; 6. Magnetic buckle seat; 7. Indicator component; 71. Detection switch; 72. Indicator; 8. Sliding component; 81. Slide rail; 82. Slider; 9. Guide post; 10. Tensioning spring. Detailed Implementation

[0027] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0028] An embodiment of this utility model provides a composite magnetic press-type anti-pull device, such as... Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, it includes: at least one unit device 1, the unit device 1 including: a housing 2, which is disposed on the vehicle body or equipment associated with the charging cable; a mounting hole 3, which is opened on the side wall of the housing 2; a magnetic buckle head 4, which is disposed inside the housing 2 and partially protrudes outside the housing 2 through the mounting hole 3; a strap 5, which has a fixed end and a movable end, and is disposed on the vehicle body or equipment associated with the charging cable, wherein the fixed end of the strap 5 and the housing 2 are respectively located on both sides of the charging cable; and a magnetic buckle seat 6, which is disposed on the movable end of the strap 5.

[0029] For example, for ease of description, the vehicle body or equipment for the charging cable in the embodiment is specifically a power supply vehicle, such as... Figure 3 As shown.

[0030] For example, the housing 2 is fixedly connected to the side of the power cart by bolts and is positioned above the charging cable. The housing 2 has a magnetic snap-on head 4, and the fixing end of the strap 5 is positioned below the charging cable. With this configuration, when the magnetic snap-on seat 6 and the magnetic snap-on head 4 are engaged, the movable end of the strap 5, the magnetic snap-on seat 6, is positioned above the charging cable, while the fixing end of the strap 5 is positioned below the charging cable, effectively securing the charging cable when not in use.

[0031] For example, in this embodiment, both the magnetic latch base 6 and the magnetic latch head 4 are circular or cylindrical magnetic latch devices. Circular or cylindrical magnetic latch devices have no sharp edges, so even if they rub against operators, aircraft bodies, power supply vehicles, or charging cables, they are less likely to cause substantial scratches, thus improving safety.

[0032] For example, the housing 2 in this embodiment has a square structure, referring to... Figure 1 , Figure 3 and Figure 4 As shown in the diagram, housing 2 is divided into left, right, top, bottom, front, and back sides. The back side connects to the power supply vehicle body. The mounting hole 3 is located on the top of housing 2, which is more ergonomically designed to accommodate the bending of the human wrist and facilitates operation, making it easier for operators to engage or disengage the magnetic latch seat 6 and the magnetic latch head 4. Specifically, the structural shape of housing 2 and the location of the mounting hole 3 can be designed according to actual production or usage requirements and are not specifically limited here. For example, the mounting hole 3 could be located on the front of housing 2.

[0033] In one possible embodiment, such as Figure 1 and Figure 5 As shown, the unit device 1 also includes: a prompting component 7, which is disposed inside the housing 2, and outputs a normally closed signal when the magnetic latch seat 6 and the magnetic latch head 4 are engaged with each other; or, outputs a normally open signal when the magnetic latch seat 6 and the magnetic latch head 4 are disengaged.

[0034] For example, the prompt component 7 is connected to the display unit, which contains a controller, enabling the connection between the prompt component 7 and the controller. The controller is connected to the Engine Control Unit (ECU) of the power supply vehicle, and controls the start and stop of the ECU by receiving normally open or normally closed signals. When the charging cable is not retracted and the magnetic latch 6 and magnetic latch head 4 are disengaged, the prompt component 7 outputs a normally open signal, the controller prevents the ECU from working, and the power supply vehicle cannot be driven away, thus avoiding a charging cable snagging accident. When the magnetic latch 6 and magnetic latch head 4 are engaged, the prompt component 7 outputs a normally closed signal, the controller does not interfere with the normal operation of the ECU, the power supply vehicle can start normally, thus achieving anti-snagging of the charging cable and ensuring the safety of the charging cable.

[0035] In one possible embodiment, such as Figure 1 As shown, the prompting component 7 includes: a detection switch 71, which is located on the back of the magnetic snap-fit ​​head 4 and is electrically connected to an external controller; and a prompter 72, which is installed in the housing 2 and is electrically connected to the external controller.

[0036] For example, the output of the prompt component 7 for a normally open signal or a normally closed signal is achieved through a detection switch 71 inside the prompt component 7.

[0037] For example, by setting up an indicator 72, the safety of charging cable retrieval is further improved. When the magnetic buckle seat 6 and the magnetic buckle head 4 are engaged with each other, the indicator 72 promptly reminds the charging operator that the strap 5 has been engaged with the housing 2, indicating that the charging cable has been successfully retrieved, thus providing an effective reminder and further improving the safety of charging cable retrieval.

[0038] For example, when the magnetic buckle seat 6 is disengaged from the magnetic buckle head 4, the indicator 72 outputs a normally open signal, which reminds the charging operator in real time that the strap 5 has not yet been engaged with the housing 2, thus effectively providing a reminder and further improving the safety of recycling the charging cable.

[0039] In one possible embodiment, such as Figure 5 As shown, the indicator 72 is at least one of a display screen, a speaker, or an indicator light.

[0040] For example, the indicator 72 provides a prompt in response to a prompt command output by the detection switch 71. The indicator 72 includes at least one of a display screen, a speaker, and an indicator light, and is controlled by a controller. For instance, the display screen may indicate whether the charging cable has been retracted by showing subtitles, the speaker may play a specific voice prompt periodically to indicate whether the charging cable has been retracted, and the indicator light may indicate whether the charging cable has been retracted by displaying green or being off. This setup effectively prompts the operator whether the charging cable has been retracted, further improving the safety of the charging cable and preventing snagging accidents.

[0041] In one possible embodiment, such as Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the unit device 1 also includes a sliding component 8, which is disposed on the side of the housing 2, and the side faces the matching vehicle body or equipment of the charging cable.

[0042] For example, the aforementioned side in this embodiment is the back of the housing 2. By setting the sliding component 8 on the back of the housing 2, the housing 2 as a whole can slide relative to the body of the power supply vehicle, thereby changing the position of the strap 5 that binds the charging cable. Since the position or angle of the charging cable when it is coiled is different each time it is retrieved, the state of the charging cable after each retrieval may change to some extent. The setting of the sliding component 8 is beneficial to bind the charging cable at the position that needs to be bound.

[0043] In one possible embodiment, such as Figure 1 , Figure 2, Figure 4 and Figure 5 As shown, the sliding component 8 includes: a slide rail 81, which is disposed on the side of the vehicle body or device to which the charging cable is attached; and a slider 82, which is disposed on the side of the slide rail 81 and is slidably connected to the slide rail 81.

[0044] For example, the slide rail 81 is fixedly installed on the side of the power supply vehicle by bolts, and the slider 82 slides with the slide rail 81, so that the slider 82 can slide relative to the slide rail 81, thereby enabling the housing 2 to slide relative to the power supply vehicle, and ultimately realizing the change of the binding position of the strap 5 relative to the charging cable.

[0045] In one possible embodiment, such as Figure 4 As shown, the housing 2 is inclinedly disposed on the side of the vehicle body or equipment that is compatible with the charging cable, and then the unit device 1 slides along the inclined direction of the housing 2 when the magnetic buckle seat 6 and the magnetic buckle head 4 are engaged with each other.

[0046] For example, when the magnetic buckle seat 6 and the magnetic buckle head 4 are engaged with each other, the magnetic buckle seat 6 on the strap 5 increases the overall weight of the housing 2. Since the housing 2 is tilted, under the influence of gravity, the housing 2 can slide along the tilt direction set by the slide rail 81 without providing a power source, thus changing the position of the strap 5 relative to the charging cable.

[0047] For example, the tilting of the housing 2 is achieved by tilting the slide rail 81. The angle of tilt of the housing 2 relative to the horizontal line, and the length of the slide rail 81 (i.e., the range of positional variation of the strap 5 relative to the charging cable), can be determined according to actual usage requirements and are not specifically limited here. For example, in this embodiment, the tilting angle of the housing 2 is 15°. Figure 4 As shown, the angle B between the slide rail 81 and the horizontal line is 15°. Furthermore, as the tilt angle of the slide rail 81 increases, the range of positional changes of the strap 5 relative to the charging cable under the influence of gravity as the housing 2 slides along the slide rail 81 is greater; conversely, as the tilt angle of the slide rail 81 decreases, the range of positional changes of the strap 5 relative to the charging cable under the influence of gravity is smaller.

[0048] In one possible embodiment, such as Figure 1 As shown, the elastic band 51 is configured as part of the strap 5, so that when the unit device 1 slides along the inclined direction of the housing 2, the strap 5 adapts to the length of the strap 5 after the unit device 1 slides.

[0049] For example, the elastic band 51 is located in the middle of the strap 5. The length of the elastic band 51 should not be too long to avoid the charging cable not being securely fastened due to its elasticity. Therefore, the length of the elastic band 51 does not exceed one-third of the total length of the strap 5. Since the movable end of the strap 5 can slide with the sliding component 8, and the fixed end of the strap 5 is fixed to the side of the power cart, after the housing 2 slides along the slide rail 81 using the slider 82, the position of the strap 5 will change relative to before the slide, that is, the strap 5 will be in an inclined state. Therefore, the length of the strap 5 needs to be passively increased. Thus, the specific length of the elastic band 51 depends on the actual use and is not specifically limited here.

[0050] In one possible embodiment, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, when there are two unit devices 1: the housings 2 of the two unit devices 1 are tilted in opposite directions, and when the magnetic snap-fit ​​seat 6 and the magnetic snap-fit ​​head 4 are engaged with each other, the two unit devices 1 slide away from each other along the tilt direction of the housing 2.

[0051] For example, such as Figure 4 As shown, the left unit device 1 is tilted 15° downwards to the left, and the right unit device 1 is tilted 15° downwards to the right. With both magnetic latch seats 6 engaged with their corresponding magnetic latch heads 4, under the influence of gravity on each magnetic latch seat 6, the left unit device 1 slides to the left along the 15° tilt, and the right unit device 1 slides to the right along the 15° tilt. This causes the two unit devices 1 to move further apart, increasing the distance between them. This arrangement increases the binding width of the two straps 5 on the charging cable, thus securing the charging cable more stably and securely.

[0052] In one possible embodiment, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, when there are two unit devices 1, it also includes: a guide post 9, which is disposed between the two unit devices 1 and connected to the inside of the housing 2 of each unit device 1; and a tightening spring 10, which is sleeved on the outside of the guide post 9, so that when the magnetic buckle seat 6 and the magnetic buckle head 4 are disengaged, the two unit devices 1 slide along the inclined direction of the housing 2 and move closer to each other.

[0053] For example, screw holes can be provided inside the housing 2, and screw holes are also provided at both ends of the guide post 9. When installing the unit device 1, the tension spring 10 is directly sleeved on the guide post 9, and then the two ends of the guide post 9 are connected to the screw holes on both sides of the housing 2 by bolts. The two ends of the tension spring 10 are respectively hung on hooks provided inside each housing 2. The bolt and nut connection and the hook connection of the tension spring 10 are both detachable connections, which facilitates timely replacement of the tension spring 10 when its elasticity diminishes.

[0054] For example, such as Figure 3 As shown, by setting the guide post 9 and the tightening spring 10, when the magnetic buckle seat 6 and the magnetic buckle head 4 are disengaged, the two unit devices 1 slide along the inclined direction and move closer to each other. At this time, the strap 5 is not connected to the housing 2, but is magnetically attracted to the side of the power cart. The tightening spring 10 makes the distance between the two unit devices 1 closer, which is beneficial for the charging operator to connect the two straps 5 more quickly when retrieving the charging cable. If the distance between the two unit devices 1 is long, the charging operator needs to connect one strap 5 first and then connect the other strap 5. In this embodiment, by setting the guide post 9 and the tightening spring 10, the operator can handle the two straps 5 in only one position when retrieving the charging cable. After the two straps 5 are connected to their respective housings 2, the unit device 1 on the left slides to the left and the unit device 1 on the right slides to the right, further increasing the width of the two straps 5 binding the charging cable, making the charging cable more secure.

[0055] For example, by setting the guide post 9, the direction of elastic retraction of the tension spring 10 is limited when the unit device 1 on both sides is tightened, so as to avoid the tension spring 10 from deviating in the direction of retraction due to its large elasticity, which would cause damage or adverse effects on the slide rail 81 and the slider 82.

[0056] For example, such as Figure 5 As shown, if the tilt angle of the housing 2 is small, a single cylindrical guide post 9 is sufficient. If the tilt angle of the housing 2 is large, two cylindrical guide posts 9 (not shown in the figure) are used. The two cylindrical guide posts 9 are arranged in a herringbone shape and are made of metal, allowing them to be welded together. Alternatively, the two guide posts 9 can be made of plastic, allowing for integral molding or 3D printing. Each guide post 9 is equipped with a tension spring 10; that is, there are two tension springs 10, each fitted onto one of the two guide posts 9. This ensures that the guiding function of the guide posts 9 and the tensioning function of the tension springs 10 do not damage the sliding of the sliding component 8, providing correct guidance and tensioning.

[0057] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0058] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0059] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A composite magnetic press type anti-pulling hanging device, characterized in that, The composite magnetic pressing anti-pulling device comprises: at least one unit device, which comprises: a shell arranged on a vehicle body or equipment matched with the charging cable; a mounting hole formed in the side wall of the shell; a magnetic buckle head arranged in the shell and partially protruding out of the shell through the mounting hole; a strap provided with a fixed end and a movable end and arranged on the vehicle body or equipment matched with the charging cable, wherein the fixed end of the strap is located on the two sides of the charging cable respectively; a magnetic buckle seat arranged at the movable end of the strap.

2. The composite magnetic press-on anti-ladder device of claim 1, wherein, The unit device further comprises: a prompt component arranged in the shell, which outputs a normally closed signal when the magnetic buckle seat and the magnetic buckle head are mutually clamped, or a normally open signal when the magnetic buckle seat and the magnetic buckle head are disengaged. The prompt component comprises:

3. The composite magnetic press-on anti-ladder device of claim 2, wherein, a detection switch arranged on the back of the magnetic buckle head and electrically connected with an external controller; a prompter arranged in the shell and electrically connected with the external controller. The prompter is at least one of a display screen, a loudspeaker or an indicator.

4. The composite magnetic press-and-hold device of claim 3, wherein, The unit device further comprises:

5. The composite magnetic press-and-hold device of claim 1, wherein a sliding component arranged on the side of the shell, which is towards the vehicle body or equipment matched with the charging cable. The sliding component comprises:

6. The composite magnetic press-and-hold device of claim 5, wherein the magnetic material is a ferrous material. a slide rail arranged on the side of the vehicle body or equipment matched with the charging cable; a sliding block arranged on the side of the slide rail and in sliding connection with the slide rail.

7. The composite magnetic pressing anti-pulling device according to claim 5, wherein: the shell is arranged obliquely on the side of the vehicle body or equipment matched with the charging cable, so that the unit device slides along the oblique direction of the shell when the magnetic buckle seat and the magnetic buckle head are mutually clamped. Further comprising:

8. The composite magnetic press-and-hold anti-lash device of claim 7, wherein, an elastic band arranged as a part of the strap, which makes the strap adapt to the length of the strap extended after the unit device slides along the oblique direction of the shell. In the case that there are two unit devices:

9. The composite magnetic press-and-hold device of claim 8, wherein, the oblique directions of the shells of the two unit devices are opposite, so that the two unit devices move away from each other after sliding along the oblique directions of the shells when the magnetic buckle seat and the magnetic buckle head are mutually clamped. In the case that there are two unit devices, further comprising:

10. The composite magnetic press-to-release anti-ladder device of claim 9, wherein, a guide column arranged between the two unit devices and connected with the interiors of the shells of the two unit devices; a tightening spring sleeved on the exterior of the guide column, so that the two unit devices move close to each other after sliding along the oblique directions of the shells when the magnetic buckle seat and the magnetic buckle head are disengaged. ​

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