CN214754408U - Connecting device of LED box and LED display device - Google Patents

Abstract

The utility model provides a connecting device and LED display device of LED box, wherein, the connecting device of LED box includes: the first connecting component comprises a first plugging part; a second connection assembly comprising: a fixed seat; the second inserting part is movably arranged on the fixed seat and is provided with an extending position which is in inserting fit with the first inserting part and a retracting position which is separated from the first inserting part; the driving part is movably arranged on the fixed seat and is connected with the second insertion part through a linkage device so as to drive the second insertion part to move between a retraction position and an extension position; the elastic resetting piece is arranged between the fixed seat and the driving part. The technical scheme of this application can solve the problem of the lamp pearl of colliding with easily when the wire rod of LED box is connected among the correlation technique effectively.

Description

Connecting device of LED box and LED display device

Technical Field

The utility model relates to a LED shows the field, particularly, relates to a connecting device and LED display device of LED box.

Background

In the related art, after the LED boxes are spliced, the line pairs between the boxes need to be manually inserted and cascaded. During installation, the male connector and the female connector between adjacent boxes need to be plugged in opposite directions, so that cascade connection of power supplies and signals of the boxes is realized. In order to achieve the effects of attractiveness and protection of the cascade lines, most of the box bodies hide the cascade lines in the box bodies, so that a rear shell or a part of the rear shell of the box body needs to be opened during wiring, and the rear shell of the box body needs to be reinstalled after the wiring is completed. The steps are complex and tedious, and the installation efficiency of the box body is low.

In order to solve the problems, at present, a scheme that connectors are respectively fixed on the side walls of the box body is adopted by the box body, so that the problem that the wire cascade connection between the box bodies needs manual operation is solved, and when the box bodies are assembled, knocking lamps can be caused by collision between the box bodies.

SUMMERY OF THE UTILITY MODEL

A primary object of the utility model is to provide a connecting device and LED display device of LED box to the problem of colliding with the lamp pearl easily when the wire rod of the LED box among the solution correlation technique is connected.

In order to achieve the above object, according to an aspect of the present invention, there is provided a connecting device for LED boxes, including: the first connecting component comprises a first plugging part; a second connection assembly comprising: a fixed seat; the second inserting part is movably arranged on the fixed seat and is provided with an extending position which is in inserting fit with the first inserting part and a retracting position which is separated from the first inserting part; the driving part is movably arranged on the fixed seat and is connected with the second insertion part through a linkage device so as to drive the second insertion part to move between a retraction position and an extension position; the elastic resetting piece is arranged between the fixed seat and the driving part.

Furthermore, the linkage device comprises a swing rod which is arranged on the fixed seat in a swinging mode, the first end of the swing rod is movably connected with the second inserting part, and the second end of the swing rod is movably connected with the driving part.

Furthermore, the connecting device further comprises a first sliding groove and a first pin shaft arranged in the first sliding groove, one of the first pin shaft and the first sliding groove is arranged at the first end of the swing rod, the other one of the first pin shaft and the first sliding groove is arranged on the second inserting-connecting portion, the fixing seat further comprises a first guide structure, and the second inserting-connecting portion moves between a retracting position and an extending position under the guide effect of the first guide structure.

Furthermore, the connecting device further comprises a second sliding groove and a second pin shaft arranged in the second sliding groove, one of the second pin shaft and the second sliding groove is arranged at the second end of the oscillating bar, the other one of the second pin shaft and the second sliding groove is arranged on the driving part, the fixed seat further comprises a second guide structure, and the driving part moves under the guide effect of the second guide structure.

Further, elasticity resets and is the spring, and drive division includes the actuating lever and is located the butt portion of the first end of actuating lever, and the actuating lever sets up in second guide structure, and the spring housing is established on the actuating lever and is located between fixing base and the butt portion.

Further, the driving portion comprises a driving rod and a stopping portion arranged at the second end of the driving rod, the driving rod is arranged in the second guide structure, the second pin shaft is arranged at the second end of the swing rod, and the second sliding groove is arranged at the stopping portion.

Further, first guide structure is for holding the casing, and second grafting portion sets up in holding the casing, is provided with the third spout on holding the casing, and the third spout is worn to locate by first round pin axle.

Furthermore, the connecting device further comprises a pin shaft hole and a third pin shaft penetrating through the pin shaft hole, one of the pin shaft hole and the third pin shaft is arranged on the fixed seat, and the other one of the pin shaft hole and the third pin shaft is arranged on the swing rod.

According to the utility model discloses an on the other hand provides a LED display device, include: the LED lamp box comprises a first LED box body, a second LED box body and a connecting device arranged between the first LED box body and the second LED box body, wherein the connecting device is the connecting device.

Furthermore, a first connecting assembly of the connecting device is arranged in the first LED box body, a second connecting assembly of the connecting device is arranged in the second LED box body, an opening for a second inserting portion and a driving portion of the connecting device to pass through is formed in the side wall of the second LED box body, and a fixing seat of the connecting device is an independent part or is formed by a partial structure of the second LED box body.

Use the technical scheme of the utility model, connecting device includes first coupling assembling and second coupling assembling. The first connecting assembly comprises a first inserting portion, the second connecting assembly comprises a second inserting portion, the first inserting portion and the second inserting portion are arranged on the two adjacent LED boxes respectively, the first inserting portion and the second inserting portion can be matched in an inserting mode, and power supply connection or signal connection between the LED boxes is achieved. The second connecting assembly further comprises a fixing seat and a driving part, and the fixing seat is fixed on the LED box body. The driving part can drive the second insertion part to move between the retracted position and the extended position through the linkage device. When two adjacent LED box bodies are connected, the driving portion moves inwards to enable the second inserting portion to be switched to the extending position, and the second inserting portion extends out of the LED box bodies and is connected with the first inserting portion in an inserting mode. When two adjacent LED boxes are not connected together, under the action of the elastic reset piece, the driving part extends outwards to enable the second inserting part to be located at the retraction position, and the second inserting part retracts into the LED boxes to protect the second inserting part. Simultaneously, make the second grafting portion not protrusion in the lateral wall of LED box like this, at the in-process of installation LED box, the lamp plate that second grafting portion can not collide with the LED box causes the problem that the lamp pearl dropped. Simultaneously, in LED box installation, elasticity resets and can play the cushioning effect, can effectively avoid producing between the LED box and collide with, can not cause the lamp pearl that collides with like this. Consequently, the technical scheme of this application can solve the problem of the lamp pearl of colliding with easily when the wire rod of LED box is connected among the correlation technique effectively.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic perspective view of an embodiment of a connecting device of an LED box according to the present invention, wherein a second plugging portion of the connecting device is located at a retracted position;

FIG. 2 shows a schematic cross-sectional view of the connection device of FIG. 1;

fig. 3 shows a perspective view of the connection device of fig. 1, with the second plug part of the connection device in an extended position;

FIG. 4 shows a cross-sectional schematic view of the connection device of FIG. 3;

fig. 5 shows a perspective view of a second plug part of the connection device of fig. 1;

fig. 6 shows a schematic perspective view of the elastic return member of the coupling device of fig. 1;

fig. 7 shows a schematic perspective view of a second plug part and a holder of the connection device of fig. 1;

fig. 8 shows a schematic perspective view of an LED display device according to the present invention;

FIG. 9 shows an enlarged view at A of the LED display device of FIG. 8;

fig. 10 shows an enlarged view at B of the LED display device of fig. 8;

fig. 11 shows a schematic partial cross-sectional view of the LED display device of fig. 8, with the second mating part of the connection device in an extended position; and

fig. 12 shows a schematic partial cross-sectional view of the LED display device of fig. 8 with the second mating part of the connection device in a retracted position.

Wherein the figures include the following reference numerals:

1. a first connection assembly; 2. a second connection assembly; 3. a first LED box; 4. a second LED box; 10. a first insertion part; 20. a fixed seat; 21. a first guide structure; 22. a second guide structure; 30. a second insertion part; 40. a drive section; 41. a drive rod; 42. an abutting portion; 43. a stopper portion; 50. a linkage device; 51. a swing rod; 60. an elastic reset member; 71. a first chute; 72. a first pin shaft; 73. a second chute; 74. a second pin shaft; 75. a third chute; 76. a pin shaft hole; 77. and a third pin shaft.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

As shown in fig. 1 to 4, 8, 9 and 11, the embodiment of the connection device of the LED box of the present application includes a first connection assembly 1 and a second connection assembly 2. The first connecting assembly 1 includes a first inserting portion 10, and the second connecting assembly 2 includes a fixing base 20, a second inserting portion 30, a driving portion 40, a linkage 50 and an elastic restoring member 60. The second plug part 30 is movably disposed on the fixing base 20 and has an extended position in plug-fit with the first plug part 10 and a retracted position separated from the first plug part 10. The driving part 40 is movably disposed on the fixing base 20, and the driving part 40 is connected to the second insertion part 30 through a linkage 50 to drive the second insertion part 30 to move between the retracted position and the extended position. And the elastic resetting piece 60 is arranged between the fixed seat 20 and the driving part 40.

With the technical solution of this embodiment, the connecting device includes a first connecting component 1 and a second connecting component 2. The first connecting component 1 comprises a first inserting portion 10, the second connecting component 2 comprises a second inserting portion 30, the first inserting portion 10 and the second inserting portion 30 are respectively arranged on the two adjacent LED boxes, the first inserting portion 10 and the second inserting portion 30 can be matched in an inserting mode, and power supply connection or signal connection between the LED boxes is achieved. The second connecting assembly 2 further comprises a fixing seat 20 and a driving part 40, and the fixing seat 20 is fixed on the LED box body. The driving part 40 can drive the second insertion part 30 to move between the retracted position and the extended position through the linkage 50. When two adjacent LED boxes are connected, the driving part 40 moves inwards to switch the second inserting part 30 to the extending position, and the second inserting part 30 extends out of the LED boxes to be connected with the first inserting part 10 in an inserting mode. When two adjacent LED boxes are not connected together, under the action of the elastic reset piece 60, the driving portion 40 extends outwards to make the second inserting portion 30 located at the retraction position, and the second inserting portion 30 retracts into the LED box, so that the second inserting portion 30 does not protrude out of the side wall of the LED box, and the function of protecting the second inserting portion 30 is achieved. Meanwhile, in the process of installing the LED box body, the second inserting portion 30 cannot collide with a lamp panel of the LED box body to cause the problem that the lamp beads fall off. Simultaneously, in LED box installation, elasticity piece 60 that resets can play the cushioning effect, can effectively avoid producing between the LED box and collide with, can not cause the lamp pearl that collides with like this. Consequently, the technical scheme of this application can solve the problem of the lamp pearl of colliding with easily when the wire rod of LED box is connected among the correlation technique effectively.

As shown in fig. 1 to 4, the linkage device 50 includes a swing rod 51 swingably disposed on the fixing base 20, a first end of the swing rod 51 is movably connected to the second inserting portion 30, and a second end of the swing rod 51 is movably connected to the driving portion 40. Two ends of the swing rod 51 are respectively connected with the second inserting part 30 and the driving part 40, and the driving part 40 can drive the second inserting part 30 to move between the retracted position and the extended position through the swing rod 51. Compared with other linkage devices, the swing rod 51 has the advantages of simple structure and reliable transmission. Meanwhile, as the swing rod 51 is movably connected with the second inserting part 30 and the driving part 40, the swing rod 51, the second inserting part 30 and the driving part 40 cannot be blocked in the moving process.

As shown in fig. 1 to 5, the connecting device further includes a first sliding slot 71 and a first pin 72 disposed in the first sliding slot 71, the fixing base 20 further includes a first guiding structure 21, and the second inserting-connecting part 30 moves between the retracted position and the extended position under the guiding action of the first guiding structure 21. In the present embodiment, the first sliding slot 71 is disposed at the second inserting portion 30, and the first pin 72 is disposed at the first end of the swing link 51. In the process of swinging the swing rod 51, the first pin 72 slides in the first sliding slot 71 to drive the second insertion part 30 to move under the guiding action of the first guiding structure 21, so that the second insertion part 30 can be switched between the retracted position and the extended position. Preferably, the first sliding slot 71 is a strip-shaped sliding slot, the width of the first sliding slot 71 is slightly larger than the diameter of the first pin 72, and the first sliding slot 71 is perpendicular to the moving direction of the second inserting-connecting part 30. Thus, the first sliding groove 71 and the swing link 51 are easily processed, and the movement of the second inserting part 30 is reliable and smooth. Of course, the first sliding groove may have other shapes as long as the swing rod can drive the second inserting portion to move according to the predetermined track.

As shown in fig. 1 to 6, the connecting device further includes a second sliding slot 73 and a second pin 74 disposed in the second sliding slot 73, the fixing base 20 further includes a second guiding structure 22, and the driving portion 40 moves under the guiding action of the second guiding structure 22. In the present embodiment, the second sliding slot 73 is disposed on the driving portion 40, and the second pin 74 is disposed on the second end of the swing link 51. The driving portion 40 moves under the guiding action of the second guiding structure 22, so that the second pin 74 moves along the second sliding slot 73, and the swing link 51 is driven to rotate. Preferably, the second sliding slot 73 is an elongated sliding slot, the width of the second sliding slot 73 is slightly larger than the diameter of the second pin 74, and the second sliding slot 73 is perpendicular to the moving direction of the driving portion 40. Thus, the swing link 51 is easy to process, and the movement of the swing link 51 is reliable and smooth. Of course, the second sliding groove may have other shapes as long as the driving portion can drive the swing rod to swing.

As shown in fig. 6, the elastic restoring element 60 is a spring, the driving portion 40 includes a driving rod 41 and an abutting portion 42 located at a first end of the driving rod 41, the driving rod 41 is disposed in the second guiding structure 22, and the spring is sleeved on the driving rod 41 and located between the fixing base 20 and the abutting portion 42. Wherein, fixing base 20 includes pedestal body and guide holder, is provided with the guiding hole on the guide holder, and actuating lever 41 wears to locate in the guiding hole, and the spring is located between guide holder and butt portion 42. The abutting part and the driving rod can be of an integrally formed structure and can also be connected together through connecting pieces such as screws and the like. In this embodiment, the abutting portion 42 is a flat plate-shaped structure, and in the process of assembling the LED box, the abutting portion 42 abuts against the side wall of the adjacent LED box, and under the pushing of the side wall of the LED box, the driving rod 41 can move the compression spring along the guiding hole on the guiding seat to further drive the swing rod 51 to rotate, so that the second inserting portion 30 can extend out of the LED box and be in inserting fit with the first inserting portion 10 on the adjacent LED box. When the LED box is not installed together, the driving rod 41 moves along the guiding hole on the guiding seat under the action of the elastic force of the spring, so that the abutting portion 42 is far away from the guiding seat and drives the second inserting portion 30 to retract into the LED box through the swing rod 51. In the present embodiment, in order to ensure the stability and reliability of the movement of the driving portion 40, the number of the driving rods 41 is two, and the number of the corresponding springs is also two.

As shown in fig. 6, the driving portion 40 includes a driving rod 41 and a stopping portion 43 disposed at a second end of the driving rod 41, the driving rod 41 is disposed in the second guiding structure 22, the second pin 74 is disposed at a second end of the swing link 51, and the second sliding slot 73 is disposed at the stopping portion 43. The stop 43 prevents the drive rod 41 from disengaging the second guide structure 22, and in particular, the stop 43 may be connected to the drive rod 41 by a screw.

As shown in fig. 1 to 6, the first guiding structure 21 is a housing, the second inserting portion 30 is disposed in the housing, a third sliding slot 75 is disposed on the housing, and the first pin 72 penetrates through the third sliding slot 75. In this embodiment, the third sliding slot 75 is an arc-shaped sliding slot, which adapts to the movement track of the first end of the swing link 51 during the swing motion of the swing link 51. Of course, the third sliding groove may have other shapes, for example, an opening provided in the housing case, as long as the housing case does not obstruct the movement of the first pin.

As shown in fig. 1 to 4 and 7, the connecting device further includes a pin shaft hole 76 and a third pin shaft 77 inserted into the pin shaft hole 76. In the present embodiment, the third pin shaft 77 is disposed on the fixed base 20, the pin shaft hole 76 is disposed on the swing link 51, and a screw is disposed at an end of the third pin shaft 77, so that the swing link 51 can swing around the third pin shaft 77 under the driving of the driving part 40. In the embodiment shown in fig. 1 to 7, when the connecting device is not driven by an external force (the two LED housings are not connected to each other), the driving portion 40 protrudes from the side wall of the LED housing (as shown in fig. 4 and 11). This has the advantage that the driving part 40 can be driven to move inwards directly through the side wall of the LED box, so that the second insertion part 30 can be switched from the retracted position to the extended position. Preferably, the connecting device may be disposed between two LED boxes adjacent in the up-down direction. As shown in fig. 11 and 12, when the LED boxes are spliced, the elastic restoring member 60 of the upper LED box contacts with the lower LED box, and as the LED boxes move downward, the spring compresses, the driving rod 41 moves upward to drive the swing rod 51 to move, the right end of the swing rod 51 moves upward, and the left end moves downward to drive the second inserting-connecting part 30 to move downward. When the two contact surfaces between the LED housings coincide, the second insertion part 30 and the first insertion part 10 are inserted into each other.

Of course, as one skilled in the art will appreciate, in other embodiments, when the connecting device is not driven by external force (the two LED housings are not connected), the driving portion may be always located inside the LED housing (as shown in fig. 10). At this moment, an elastic trigger piece is required to be arranged on the LED box body matched with the driving part, and the elastic trigger piece can stretch into the LED box body to push the driving part to move, so that the second inserting part is switched to the extending position from the retracting position. Preferably, the connecting device may be disposed between two adjacent LED housings in the left-right direction.

The application also provides an LED display device, and an embodiment of the LED display device is shown in FIGS. 8 to 12, and the LED display device comprises a first LED box body 3, a second LED box body 4 and a connecting device arranged between the first LED box body 3 and the second LED box body 4, wherein the connecting device is the connecting device.

The first connecting component 1 of the connecting device is arranged in the first LED box body 3, the second connecting component 2 of the connecting device is arranged in the second LED box body 4, and an opening for the second inserting part 30 and the driving part 40 of the connecting device to pass through is arranged on the side wall of the second LED box body 4. As shown in fig. 1, in the present embodiment, the fixing seat 20 of the connecting device is a separate component. The first connecting component 1 of the connecting device of the present embodiment has an elastic restoring element 60 on one side and a second inserting-connecting part 30 on the other side, and the two are connected through a swing rod 51. When the first LED box body 3 and the second LED box body 4 are spliced, the second inserting part 30 can be popped out to be automatically inserted with the first inserting part 10 on the first LED box body 3. Meanwhile, the spring on the connecting device can play a role in damping and buffering in the splicing process, so that the LED box body can not knock off the lamp beads due to sudden collision or contact when in contact. One of the first inserting-connecting part 10 and the second inserting-connecting part 30 is a male connector, and the other is a female connector.

And meanwhile, the magnet pieces are arranged at the corresponding positions of the side walls of the first LED box body 3 and the second LED box body 4, and the magnet pieces attract each other during installation, so that the butt joint of the first LED box body 3 and the second LED box body 4 is easier to realize.

As shown in fig. 11, when the first LED box 3 and the second LED box 4 are not yet mounted together, the second inserting portion 30 is located inside the second LED box 4, the spring is in an extended state, the driving portion 40 extends out of the second LED box 4 through the opening, and the driving portion 40 can play a role of buffering when the second LED box 4 is carried or the first LED box 3 is butted with the second LED box 4. In the splicing process, as the side walls of the first LED box 3 and the second LED box 4 gradually approach, the side wall of the first LED box 3 pushes the driving portion 40, and the spring is compressed, so that the driving portion 40 moves towards the inside of the second LED box 4 and drives the swing rod 51 to move. The swing rod 51 swings anticlockwise, the second end of the swing rod 51 moves towards the inside of the second LED box body, the first end of the swing rod 51 moves towards the outside of the second LED box body, and the second inserting portion 30 is driven to extend out of the second LED box body 4 through the opening and is in inserting matching with the first inserting portion 10 located on the first LED box body 3. As shown in fig. 12, at this time, the side walls of the first LED box 3 and the second LED box 4 are butted together, the first inserting portion 10 and the second inserting portion 30 are inserted together to realize power supply connection or signal connection between the first LED box 3 and the second LED box 4, the driving portion 40 is located in the second LED box 4, and the spring is in a compressed state.

In this embodiment, the second insertion portion 30 has an insertion pin, the first insertion portion 10 is provided with an insertion pin connector, and when the first insertion portion 10 and the second insertion portion 30 are inserted together, the insertion pin contacts the insertion pin connector arranged at the corresponding position, so that power supply connection or signal connection between the first LED box 3 and the second LED box 4 is realized.

In the process of disassembling the LED display device, the abutting portion 42 pushes the sidewall of the first LED box abutting against the side wall of the first LED box under the elastic force of the spring, so that the disassembly is easier.

Of course, in an embodiment not shown in the figures, the fixing seat of the connecting device may also be composed of a part of the structure of the second LED box.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be interpreted as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and if not stated otherwise, the terms have no special meaning, and therefore, the scope of the present invention should not be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a connecting device of LED box which characterized in that includes:

a first connection assembly (1) comprising a first plug-in part (10);

a second connection assembly (2) comprising:

a fixed seat (20);

the second plug-in part (30) is movably arranged on the fixed seat (20) and is provided with an extending position in plug-in fit with the first plug-in part (10) and a retracting position separated from the first plug-in part (10);

the driving part (40) is movably arranged on the fixed seat (20), and the driving part (40) is connected with the second insertion part (30) through a linkage device (50) so as to drive the second insertion part (30) to move between a retracted position and an extended position;

and the elastic resetting piece (60) is arranged between the fixed seat (20) and the driving part (40).

2. The connecting device according to claim 1, wherein the linkage device (50) comprises a swing link (51) swingably disposed on the fixing base (20), a first end of the swing link (51) is movably connected to the second insertion portion (30), and a second end of the swing link (51) is movably connected to the driving portion (40).

3. The connecting device according to claim 2, characterized in that the connecting device further comprises a first sliding slot (71) and a first pin (72) arranged in the first sliding slot (71), one of the first pin (72) and the first sliding slot (71) is arranged at the first end of the swing rod (51), the other is arranged on the second plug-in part (30), the fixing base (20) further comprises a first guiding structure (21), and the second plug-in part (30) moves between the retracted position and the extended position under the guiding action of the first guiding structure (21).

4. The connecting device according to claim 2, characterized in that the connecting device further comprises a second sliding slot (73) and a second pin (74) arranged in the second sliding slot (73), one of the second pin (74) and the second sliding slot (73) is arranged on the second end of the swing link (51), the other is arranged on the driving part (40), the fixed seat (20) further comprises a second guiding structure (22), and the driving part (40) moves under the guiding action of the second guiding structure (22).

5. The connecting device according to claim 4, wherein the elastic restoring member (60) is a spring, the driving portion (40) includes a driving rod (41) and an abutting portion (42) located at a first end of the driving rod (41), the driving rod (41) is disposed in the second guiding structure (22), and the spring is sleeved on the driving rod (41) and located between the fixed seat (20) and the abutting portion (42).

6. The connecting device according to claim 4, wherein the driving portion (40) comprises a driving rod (41) and a stopper (43) disposed at a second end of the driving rod (41), the driving rod (41) is disposed in the second guiding structure (22), the second pin (74) is disposed at a second end of the swing link (51), and the second sliding slot (73) is disposed at the stopper (43).

7. The connecting device according to claim 3, wherein the first guiding structure (21) is a housing, the second insertion portion (30) is disposed in the housing, a third sliding slot (75) is disposed on the housing, and the first pin (72) is inserted into the third sliding slot (75).

8. The connecting device according to claim 2, further comprising a pin shaft hole (76) and a third pin shaft (77) penetrating through the pin shaft hole (76), wherein one of the pin shaft hole (76) and the third pin shaft (77) is disposed on the fixing base (20), and the other is disposed on the swing rod (51).

9. An LED display device comprising:

a first LED box body (3), a second LED box body (4) and a connecting device arranged between the first LED box body (3) and the second LED box body (4),

it is characterized in that the preparation method is characterized in that,

the connection device of any one of claims 1 to 8.

10. The LED display device according to claim 9, wherein the first connecting assembly (1) of the connecting device is disposed in the first LED box (3), the second connecting assembly (2) of the connecting device is disposed in the second LED box (4), an opening for passing the second inserting portion (30) and the driving portion (40) of the connecting device is disposed on a sidewall of the second LED box (4), and the fixing seat (20) of the connecting device is an independent component, or the fixing seat (20) of the connecting device is formed by a partial structure of the second LED box (4).

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