Couplet frame

Abstract

The utility model relates to the technical field of couplet packaging, in particular to a couplet frame which comprises a top frame, two side frames, a bottom frame, a back plate, a transparent panel and a buckle assembly. The bottom frame comprises a sectional material body and a turnover cover plate. One side of the overturning cover plate is hinged to one side of the profile body so that the other side of the overturning cover plate can be far away from or abut against the panel, and after the other side of the overturning cover plate is overturned, the other side of the overturning cover plate and the inner side face of the profile body are arranged in a spaced mode so that a first clamping groove used for containing the panel, the couplet and the back plate can be formed. The buckle assembly comprises at least one buckle piece. And one end of the fastener is fixed on the other side of the profile main body. The other end of the buckling piece is arranged in a bent mode to abut against the side, away from the sectional material body, of the overturning cover plate. And if the couplet needs to be opened and taken out, the turnover cover plate is manually shifted to rotate so as to bounce off the buckling piece, and the panel, the couplet and the back plate can be taken out and replaced by opening the bottom frame, so that the use is very convenient, and the mounting and dismounting efficiency is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of couplet packaging, especially to a couplet frame. BACKGROUND

[0002] Couplet, also known as Spring Festival couplet, is an ancient traditional culture in China. Every Spring Festival, every family will paste Spring Festival couplet, also known as column couplet or couplet, which is a couplet written on paper or cloth or carved on bamboo, wood or column. The couplet is well-structured, with balanced tone and rhyme, and is a unique artistic form of Chinese language with one word and one tone. At present, the most commonly used couplet is written on paper. Traditionally, people usually paste the paper couplet on the wall or column directly by using glue. This way of fixing the couplet makes the couplet directly exposed to the air, which is easily damaged by wind and sun or by children. Therefore, there are frames on the market to prevent the couplet from being damaged. However, the existing couplet frame needs to be locked by using tools such as screwdrivers after placing the couplet, which is complicated to operate and inconvenient for people to replace the couplet in the frame. Moreover, the screw hole is easily deformed after the screw is tightened and withdrawn for many times, which makes it difficult to lock the screw, thereby reducing the service life of the couplet frame. SUMMARY

[0003] In order to solve the technical defects in the background art, the purpose of the utility model is to provide a couplet frame.

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0005] A couplet frame, comprising a top frame, two side frames, a bottom frame, a backboard and a transparent panel, the top frame, the two side frames and the bottom frame form a frame structure, the panel and the backboard are fixed between the frame, and the couplet is placed between the panel and the backboard; it further comprises a buckle assembly; the bottom frame comprises a profile main body and a turnover cover plate; one side of the turnover cover plate is hingedly connected to one side of the profile main body, so that the other side of the turnover cover plate is away from or abuts against the panel, and the other side of the turnover cover plate is spaced apart from the inner side of the profile main body after being turned over to form a first clamping groove for placing the panel, the couplet and the backboard; the buckle assembly comprises at least one buckle for fixing the turnover cover plate to the profile main body; one end of the buckle is fixed to the other side of the profile main body; the other end of the buckle is bent to abut against one side of the turnover cover plate away from the profile main body.

[0006] By adopting the technical scheme, the bottom frame is opened in a flip cover form of the profile main body and the flip cover plate, and the rotatable flip cover plate is fixed by the buckle member, so that the fixed flip cover plate cooperates with the bottom end of the panel, the couplet and the back plate to close the panel. If it is needed to open and take out the couplet, the flip cover plate is manually rotated to pop the buckle member, and the bottom frame is opened to take out and replace the panel, the couplet and the back plate, which is very convenient to use and high in installation and dismounting efficiency.

[0007] Further, the slot width of the opening side of the first clamping groove is smaller than the slot width inside the first clamping groove, which provides space for opening and closing of the buckle member, prevents the buckle member from being separated from the first clamping groove, and is more convenient to use.

[0008] Further, the buckle member comprises a clamping hook part and a fixing part. One end of the clamping hook part is arranged between the profile main body and the back plate and located in the first clamping groove. The other end of the clamping hook part is located on the other side of the profile main body. One end of the fixing part is fixedly connected with the other end of the clamping hook part, and the other end of the fixing part is arranged to be bent towards one side of the flip cover plate to fix the flip cover plate. The structure is simple, the installation is convenient, and the cost is saved.

[0009] Further, the clamping hook part comprises a first clamping block, a second clamping block and a third clamping block connected in sequence. The first clamping block and the third clamping block are arranged to be bent towards the same side relative to the second clamping block. The first clamping block is located in the first clamping groove, the second clamping block is located between the back plate and the inner side surface of the profile main body, and the third clamping block is close to the side of the profile main body away from the flip cover plate. The first clamping block can limit the clamping hook part in the first clamping groove, and the clamping hook part will not be separated from the first clamping groove no matter the flip cover plate is in an open state or a closed state, which is convenient to use and can prevent the buckle member from being lost.

[0010] Further, the fixing part comprises a fourth clamping block and a fifth clamping block. One end of the fourth clamping block is fixedly connected with the other end of the third clamping block and arranged to be bent, and the other end of the fourth clamping block is fixedly connected with one end of the fifth clamping block and arranged to be bent. The fourth clamping block is connected with the side of the profile main body away from the back plate, and the fifth clamping block is close to the side of the flip cover plate away from the profile main body. The first clamping block, the third clamping block and the fifth clamping block are arranged oppositely, and the first clamping block is located between the third clamping block and the fifth clamping block. The second clamping block and the fourth clamping block are arranged oppositely, which is more fixed.

[0011] Further, the fixing part further comprises a sixth clamping block, one end of the sixth clamping block is fixedly connected with the other end of the fifth clamping block, and the other end of the sixth clamping block is designed to be bent away from the direction of the turnover cover plate, so that the abutting area during installation is increased, and the buckle part can be pressed to drive the turnover cover plate to rotate.

[0012] Further, the inner side wall of the side frame is provided with a second clamping groove, the groove depth of the second clamping groove is greater than the sum of the thicknesses of the panel, the counterlink and the back plate. The buckle assembly further comprises at least one elastic piece, and each side frame is provided with at least one elastic piece. One end of the elastic piece is located in the second clamping groove and is clamped between the back plate and the inner side wall of the second clamping groove. The other end of the elastic piece protrudes from the second clamping groove, so that the elastic piece can be conveniently installed and dismounted.

[0013] Further, the elastic piece comprises a first elastic sheet and a second elastic sheet. The side surface of the first elastic sheet abuts against the back plate, one end of the first elastic sheet in the second clamping groove is fixedly connected with one end of the second elastic sheet, and the other end of the first elastic sheet is separately arranged from the other end of the second elastic sheet and is located outside the second clamping groove. When the elastic piece is in an initial state, the distance between the other end of the first elastic sheet and the other end of the second elastic sheet is greater than the distance between the back plate and the inner side wall of the second clamping groove, so that the elastic piece generates tension after installation to fix the back plate and the counterlink, and the stability of the structure is improved, and installation is more convenient.

[0014] Further, the other end of the first elastic sheet is arranged to be bent towards one side of the second elastic sheet, and when the elastic piece is installed in the second clamping groove, the bent end of the first elastic sheet abuts against the second elastic sheet, so that the first elastic sheet or the second elastic sheet cannot be pressed out of the second clamping groove by external force, and the stability of the structure is improved.

[0015] Further, the elastic piece further comprises a pressing block, the pressing block is arranged at the other end of the second elastic sheet and located on the side away from the first elastic sheet, so that installation and dismounting are more convenient.

[0016] In summary, the beneficial effects of the utility model are as follows:

[0017] The utility model discloses a bottom frame adopts the form of profile main body and turnover cover plate to open, and the rotatable turnover cover plate is fixed through the buckle part, so that the fixed turnover cover plate cooperates with the bottom end of the profile main body, the panel, the counterlink and the back plate. If it is needed to open and take out the counterlink, the turnover cover plate is manually driven to rotate to pop the buckle part, and the panel, the counterlink and the back plate can be taken out and replaced after the bottom frame is opened, so that use is very convenient, and installation and dismounting efficiency is high. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic view of an embodiment of the pair of frame.

[0019] Figure 2 is Figure 1 is an enlarged schematic view of the connection between the bottom frame and the side frame in the pair of frame.

[0020] Figure 3 is an exploded structural schematic view of an embodiment of the bottom frame and the buckle member of the pair of frame.

[0021] Figure 4 is a structural schematic view of an open state of an embodiment of the bottom frame and the buckle member of the pair of frame.

[0022] Figure 5 is a structural schematic view of an assembled and fixed state of an embodiment of the bottom frame and the buckle member of the pair of frame.

[0023] Figure 6 is an exploded structural schematic view of an embodiment of the side frame and the elastic member of the pair of frame.

[0024] Figure 7 is a structural schematic view of an assembled and fixed state of an embodiment of the side frame and the elastic member of the pair of frame.

[0025] Explanation of reference numerals in the drawings:

[0026] 1, pair of frame; 2, top frame; 3, side frame; 31, second clamping groove; 4, bottom frame; 41, profile main body; 42, turnover cover plate; 43, first clamping groove; 5, back plate; 6, panel; 71, buckle member; 711, first clamping block; 712, second clamping block; 713, third clamping block; 714, fourth clamping block; 715, fifth clamping block; 716, sixth clamping block; 72, elastic member; 721, first elastic sheet; 722, second elastic sheet; 723, pressing block; 8, pair of frame. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0028] Those skilled in the art should understand that, in the disclosure of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this utility model.

[0029] In the description of this utility model, the use of terms such as "several" means one or more, with "multiple" meaning two or more. Terms like "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of terms like "first," "second," and "third" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, the quantity of indicated technical features, or the sequential relationship between indicated technical features.

[0030] The following is in conjunction with the appendix Figures 1-7 The embodiments of this utility model will be described in further detail below.

[0031] A couplet frame 1, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, it includes a top frame 2, two side frames 3, a bottom frame 4, a back panel 5, a transparent panel 6, and a snap-fit ​​assembly. The top frame 2, two side frames 3, and bottom frame 4 form a frame structure. The panel 6 and back panel 5 are fixed between the frames, and the couplet 8 is placed between the panel 6 and back panel 5. The bottom frame 4 includes a profile body 41 and a flip cover 42. One side of the flip cover 42 is hinged to one side of the profile body 41, so that the other side of the flip cover 42 is connected to the panel 6 away from or against it. After the other side of the flip cover 42 is flipped, it is spaced apart from the inner side of the profile body 41 to form a first slot 43 for placing the panel 6, couplet 8, and back panel 5. The snap-fit ​​assembly includes at least one snap fastener 71 for fixing the flip cover 42 to the profile body 41. One end of the snap fastener 71 is fixed to the other side of the profile body 41. The other end of the snap fastener 71 is bent to abut against the side of the flip cover 42 away from the profile body 41.

[0032] The bottom frame 4 is opened in the form of the profile main body 41 and the flip cover plate 42, and the rotatable flip cover plate 42 is fixed by the buckle 71, so that the fixed flip cover plate 42 cooperates with the profile main body 41 to close the bottom end of the panel 6, the couplet 8 and the back plate 5. If it is needed to open and take out the couplet 8, the flip cover plate 42 is manually rotated to pop open the buckle 71, and the panel 6, the couplet 8 and the back plate 5 can be taken out and replaced by opening the bottom frame 4, which is very convenient to use and has high installation and disassembly efficiency.

[0033] In some embodiments, please refer to Figure 5 , the slot width of the opening side of the first clamping groove 43 is smaller than the slot width inside the first clamping groove 43, which provides space for opening and closing of the buckle 71, can prevent the buckle 71 from being separated from the first clamping groove 43, and is more convenient to use.

[0034] In some embodiments, please refer to Figure 4 、 Figure 5 The buckle 71 includes a clamping hook part and a fixing part. One end of the clamping hook part is arranged between the profile main body 41 and the back plate 5 and located in the first clamping groove 43. The other end of the clamping hook part is located on the other side of the profile main body 41. One end of the fixing part is fixedly connected with the other end of the clamping hook part, and the other end of the fixing part is arranged to be bent towards one side of the flip cover plate 42 to fix the flip cover plate 42, which has simple structure, convenient installation and cost saving.

[0035] Preferably, the clamping hook part includes a first clamping block 711, a second clamping block 712 and a third clamping block 713 connected in sequence. The first clamping block 711 and the third clamping block 713 are arranged to be bent towards the same side relative to the second clamping block 712. The first clamping block 711 is located in the first clamping groove 43, the second clamping block 712 is located between the back plate 5 and the inner side surface of the profile main body 41, and the third clamping block 713 is close to the side of the profile main body 41 away from the flip cover plate 42. The first clamping block 711 can limit the clamping hook part in the first clamping groove 43, which will not be separated from the first clamping groove 43 no matter in the open state or the closed state of the flip cover plate 42, and is convenient to use and can prevent the buckle 71 from being lost.

[0036] In some embodiments, please refer to Figure 4 、 Figure 5The fixing part includes a fourth clamping block 714 and a fifth clamping block 715. One end of the fourth clamping block 714 is fixedly connected to the other end of the third clamping block 713 and is arranged in a bent manner. The other end of the fourth clamping block 714 is fixedly connected to one end of the fifth clamping block 715 and is arranged in a bent manner. The fourth clamping block 714 is connected to the side of the profile main body 41 away from the back plate 5, and the fifth clamping block 715 is close to the side of the flip cover plate 42 away from the profile main body 41. The first clamping block 711, the third clamping block 713, and the fifth clamping block 715 are arranged opposite to each other, and the first clamping block 711 is located between the third clamping block 713 and the fifth clamping block 715. The second clamping block 712 and the fourth clamping block 714 are arranged opposite to each other, and the fixing is more firm. The length of the first clamping block 711 along the slot width direction of the first clamping groove 43 is greater than the minimum distance between the inner side wall of the side of the back plate 5 opposite to the first clamping groove 43.

[0037] Preferably, the fixing part further includes a sixth clamping block 716. One end of the sixth clamping block 716 is fixedly connected to the other end of the fifth clamping block 715. The other end of the sixth clamping block 716 is arranged in a bent manner away from the flip cover plate 42, which increases the abutting area during installation and facilitates pressing the buckle part 71 to push the flip cover plate 42 to rotate.

[0038] Specifically, when the fourth clamping block 714 is pressed, the buckle part 71 rotates clockwise as a whole under the limiting action of the profile main body 41. The side surface of the sixth clamping block 716 extrudes and pushes the side surface of the opened flip cover plate 42, thereby driving the flip cover plate 42 to rotate to a horizontal closed state to abut against the panel 6.

[0039] In some embodiments, referring to Figure 6 、 Figure 7 The inner side wall of the side frame 3 is provided with a second clamping groove 31. The groove depth of the second clamping groove 31 is greater than the sum of the thicknesses of the panel 6, the opposite joint 8, and the back plate 5. The buckle assembly further includes at least one elastic piece 72. Each side frame 3 is provided with at least one elastic piece 72. One end of the elastic piece 72 is located in the second clamping groove 31 and is clamped between the back plate 5 and the inner side wall of the second clamping groove 31. The other end of the elastic piece 72 protrudes out of the second clamping groove 31, which facilitates the installation and removal of the elastic piece 72.

[0040] In some embodiments, referring to Figure 6 、 Figure 7The elastic member 72 comprises a first elastic sheet 721 and a second elastic sheet 722. The side surface of the first elastic sheet 721 abuts against the back plate 5. One end of the first elastic sheet 721 is fixedly connected to one end of the second elastic sheet 722, and the other end of the first elastic sheet 721 is separately arranged from the other end of the second elastic sheet 722 and is located outside the second clamping groove 31. When the elastic member 72 is in the initial state, the distance between the other end of the first elastic sheet 721 and the other end of the second elastic sheet 722 is greater than the distance between the back plate 5 and the inner side wall of the second clamping groove 31, so that the installed elastic member 72 generates tension to fix the back plate 5 and the counter-joint 8, improves the stability of the structure, and is more convenient to install.

[0041] Preferably, the other end of the first elastic sheet 721 is bent towards one side of the second elastic sheet 722. When the elastic member 72 is installed in the second clamping groove 31, the bent end of the first elastic sheet 721 abuts against the second elastic sheet 722, which can prevent the first elastic sheet 721 or the second elastic sheet 722 from being pressed out of the second clamping groove 31 by external force, thereby improving the stability of the structure.

[0042] Preferably, the other end of the first elastic sheet 721 is bent towards one side of the second elastic sheet 722. When the elastic member 72 is installed in the second clamping groove 31, the bent end of the first elastic sheet 721 abuts against the second elastic sheet 722, which can prevent the first elastic sheet 721 or the second elastic sheet 722 from being pressed out of the second clamping groove 31 by external force, thereby improving the stability of the structure.

[0043] The top frame 2, the two side frames 3, and the bottom frame 4 are assembled into a frame structure and are connected and fixed by an L-shaped connecting plate at each of the four connected corners. The panel 6 can be made of acrylic, and the back plate 5 can be made of KT board or aluminum plastic board.

[0044] When assembling the elastic member 72, the panel 6, the counter-joint 8, and the back plate 5 are placed in the frame. The end of the elastic member 72 can be inserted into the second clamping groove 31 first, and the pressing block 723 is pressed to insert the elastic member 72 into place. At this time, the bent end of the first elastic sheet 721 abuts against the side surface of the second elastic sheet 722, which can prevent the elastic member 72 from being pressed too deeply and can prevent the elastic member 72 from being pressed out of the second clamping groove 31 by external force. Two elastic members 72 can be arranged in each side frame 3 for fixation. When disassembling, the elastic member 72 can be pulled out manually through the pressing block 723.

[0045] When assembling the buckle 71, first place the first clamping block 711 of the buckle 71 in the first clamping groove 43, and then install the back plate 5. In the loosened state, the first clamping block 711 and the second clamping block 712 are located in the first clamping groove 43, the third clamping block 713 is obliquely arranged between the back plate 5 and the profile main body 41, the connecting part of the fourth clamping block 714 and the third clamping block 713 is located above the side of the profile main body 41 away from the turnover cover plate 42, the connecting part of the fourth clamping block 714 and the fifth clamping block 715 is located on the outer side of the profile main body 41, and the turnover cover plate 42 is obliquely arranged downward. Press the side of the fourth clamping block 714 connected to the fifth clamping block 715, and rotate the buckle 71 clockwise as a whole. The first clamping block 711 is horizontally arranged in the first clamping groove 43, the second clamping block 712 is tightly attached to the inner side wall of the first clamping groove 43, the third clamping block 713 is tightly attached to the side of the profile main body 41 away from the turnover cover plate 42, the fourth clamping block 714 is tightly attached to the side of the profile main body 41 away from the back plate 5, and the fifth clamping block 715 is horizontally arranged to support the turnover cover plate 42 and prevent the turnover cover plate 42 from being reversed. After assembly, the buckle 71 covers the corresponding positions of the turnover cover plate 42 and the profile main body 41 to play a fixing role. When it is necessary to open, manually press the turnover cover plate 42 to make it rotate, and the fifth clamping block 715 moves with the turnover cover plate 42 to push the whole to rotate counterclockwise, thereby loosening the buckle 71. Under the action of the first clamping block 711, the buckle 71 will not come off from the first clamping groove 43, and use is more convenient.

[0046] After taking out the elastic member 72 and opening the buckle 72, the panel 6 can be taken out, the couplet 8 is placed in the frame, the periphery of the couplet 8 is inserted into the first clamping groove 43 and the second clamping groove 31, then the panel 6 is inserted, and finally the elastic member 72 and the buckle 72 are installed for fixation. After assembly is completed, the hanging member can be arranged on the back of the bottom frame 4 and the top frame 2, so that the assembled couplet frame 1 can be hung at a designated position.

[0047] The embodiments of the specific implementation are the preferred embodiments of the present application, but do not limit the protection scope of the present application, wherein the same parts are indicated by the same reference numerals. Therefore, equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A couplet frame, comprising a top frame (2), two side frames (3), a bottom frame (4), a back panel (5), and a transparent panel (6), wherein the top frame (2), the two side frames (3), and the bottom frame (4) form a frame structure, the panel (6) and the back panel (5) are fixed between the frame, and a couplet (8) is placed between the panel (6) and the back panel (5); characterized in that, Also include a buckle assembly; the bottom frame (4) includes a profile body (41) and a flip cover (42); one side of the flip cover (42) is hinged to one side of the profile body (41), so that the other side of the flip cover (42) is away from or connected to the panel (6), the other side of the flip cover (42) is hinged to the inner side of the profile body (41) to form a first card slot (43) for placing the panel (6), the couplet (8) and the back plate (5); the buckle assembly includes at least one buckle (71) for fixing the flip cover (42) to the profile body (41); one end of the buckle (71) is fixed to the other side of the profile body (41); the other end of the buckle (71) is bent to abut the side of the flip cover (42) away from the profile body (41).

2. The pair of link frames according to claim 1, wherein The slot width of the opening side of the first card slot (43) is smaller than the slot width inside the first card slot (43).

3. The pair of link frames according to claim 2, wherein The buckle (71) includes a hook part and a fixed part; one end of the hook part is arranged between the profile body (41) and the back plate (5), and located in the first card slot (43); the other end of the hook part is located on the other side of the profile body (41); one end of the fixed part is fixedly connected with the other end of the hook part, and the other end of the fixed part is bent towards one side of the flip cover (42) to fix the flip cover (42).

4. The pair of link frames according to claim 3, wherein The hook part includes a first clamping block (711), a second clamping block (712) and a third clamping block (713) connected in sequence; the first clamping block (711) and the third clamping block (713) are bent towards the same side relative to the second clamping block (712); the first clamping block (711) is located in the first card slot (43), the second clamping block (712) is located between the back plate (5) and the inner side of the profile body (41), and the third clamping block (713) is close to the side of the profile body (41) away from the flip cover (42).

5. The pair of link frames according to claim 4, wherein The fixed part includes a fourth clamping block (714) and a fifth clamping block (715), one end of the fourth clamping block (714) is fixedly connected with the other end of the third clamping block (713) and is bent, and the other end of the fourth clamping block (714) is fixedly connected with one end of the fifth clamping block (715) and is bent; the fourth clamping block (714) is connected with the side of the profile body (41) away from the back plate (5), and the fifth clamping block (715) is close to the side of the flip cover (42) away from the profile body (41); the first clamping block (711), the third clamping block (713) and the fifth clamping block (715) are oppositely arranged, and the first clamping block (711) is located between the third clamping block (713) and the fifth clamping block (715); the second clamping block (712) and the fourth clamping block (714) are oppositely arranged.

6. The pair of link frames according to claim 5, wherein The fixing part further comprises a sixth clamping block (716), one end of the sixth clamping block (716) is fixedly connected with the other end of the fifth clamping block (715), and the other end of the sixth clamping block (716) is designed to be bent away from the turnover cover plate (42).

7. The pair of link frames according to claim 1, wherein The inner side wall of the side frame (3) is provided with a second clamping groove (31), the groove depth of the second clamping groove (31) is greater than the sum of the thicknesses of the face plate (6), the counter-jamb (8) and the back plate (5); the buckle assembly further comprises at least one elastic piece (72), each side frame (3) is provided with at least one elastic piece (72); one end of the elastic piece (72) is located in the second clamping groove (31) and is clamped between the back plate (5) and the inner side wall of the second clamping groove (31); the other end of the elastic piece (72) protrudes from the second clamping groove (31).

8. The pair of link frames according to claim 7, wherein The elastic piece (72) comprises a first elastic sheet (721) and a second elastic sheet (722); the side surface of the first elastic sheet (721) abuts against the back plate (5), one end of the first elastic sheet (721) located in the second clamping groove (31) is fixedly connected with one end of the second elastic sheet (722), and the other end of the first elastic sheet (721) is separately arranged from the other end of the second elastic sheet (722) and is located outside the second clamping groove (31); when the elastic piece (72) is in an initial state, the distance between the other end of the first elastic sheet (721) and the other end of the second elastic sheet (722) is greater than the distance between the back plate (5) and the inner side wall of the second clamping groove (31).

9. The pair of link frames according to claim 8, wherein The other end of the first elastic sheet (721) is bent towards one side of the second elastic sheet (722), and when the elastic piece (72) is installed in the second clamping groove (31), the bent end of the first elastic sheet (721) abuts against the second elastic sheet (722).

10. The pair of link frames according to claim 8, wherein The elastic piece (72) further comprises a pressing block (723), which is arranged at the other end of the second elastic sheet (722) and located on the side away from the first elastic sheet (721).

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