CN217205058U

CN217205058U - Panel mounting structure and panel fixed subassembly

Info

Publication number: CN217205058U
Application number: CN202220843492.0U
Authority: CN
Inventors: 马佳鑫; 陈国辉; 邵逸轩; 周云; 王超; 邱智辉
Original assignee: Ningbo Helong New Material Co Ltd
Current assignee: Ningbo Helong New Material Co Ltd
Priority date: 2022-04-12
Filing date: 2022-04-12
Publication date: 2022-08-16
Anticipated expiration: 2032-04-12

Abstract

The utility model discloses a subassembly is fixed to panel mounting structure and panel, this panel mounting structure include fossil fragments spare, panel and connect in fixed subassembly between the two, respectively through connection structure interconnect between fixed subassembly and fossil fragments spare and the panel in order to realize spacing, and the mounting includes can dismantle the complex between each other first, two mountings. The utility model discloses a panel mounting structure and panel mounting can conveniently disassemble panel through the detachable construction between two mountings.

Description

Panel mounting structure and panel fixed subassembly

Technical Field

The utility model belongs to the decoration accessory field, concretely relates to can be used to panel (for example floor or wallboard) to connect and fixed panel mounting to and the mounting structure of panel.

Background

Panels are common in decoration, such as flooring, wall panels, etc., for forming floors, walls or moldings. Most of the existing boards are formed into floors, walls or moldings by closely fitting board fasteners adjacent to the keels.

The common plate fastener is mainly considered for the firmness and convenience of fixation, and the disassembly convenience of the plate is not considered, so that the plate fastener is not suitable for use occasions such as outdoor floors, balcony floors and the like which need to be disassembled.

In addition, in some particular situations, the user may need to change the sheet or sheet configuration at irregular intervals, or disassemble the sheet while treating the underlying floor.

Therefore, there is a need for a panel installation structure that is easy to assemble and disassemble, and a panel fixing assembly that can be applied to the above-mentioned scenario.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a panel mounting structure and be used for the fixed subassembly of this mounting structure's panel of easy equipment and dismantlement.

In order to achieve the purpose, the utility model adopts the following scheme:

a panel mounting structure includes a keel, a fixing member, and a panel connected to the keel via the fixing member to form the panel mounting structure.

The keel piece is provided with a first connecting piece, the plate is provided with a second connecting piece, the fixing assembly is correspondingly provided with a third connecting piece and a fourth connecting piece, the first connecting piece is matched with the third connecting piece, and the second connecting piece is matched with the fourth connecting piece, so that a limiting effect is formed at least along the vertical direction.

The fixing assembly comprises a first fixing piece and a second fixing piece, a third connecting piece is arranged on the second fixing piece, and a fourth connecting piece is arranged on the first fixing piece; the first fixing part is provided with a first fitting piece, the second fixing part is provided with a second fitting piece, and the first fitting piece and the second fitting piece are mutually clamped and matched so that the first fixing part and the second fixing part are detachably matched.

According to the plate mounting structure, the first fitting piece and the second fitting piece are respectively a convex block and a concave position which are correspondingly arranged, or are respectively two convex blocks which are arranged in a staggered manner. Preferably, at least one of the first and second mating members is beveled or curved to facilitate quick separation of the two.

According to the plate mounting structure, the first fixing piece and the second fixing piece are respectively provided with the hole piece and the convex piece.

The orifice member includes a first orifice portion and a second orifice portion, the first orifice portion having an inner diameter greater than an inner diameter of the second orifice portion so as to also be formed as a step portion within the orifice member that can serve as a first mating member. The convex part comprises a column part and a convex part, and the outer diameter of the convex part is larger than that of the column part so as to form a second fitting part.

According to the above-mentioned plate mounting structure, the convex member further includes a notch provided on the convex portion to partition it, so as to form an incoherent convex portion.

According to the plate mounting structure, the convex part comprises the first contact part and the second contact part so as to guide when the first fixing piece and the second fixing piece are clamped in or pulled out respectively.

According to the above plate mounting structure, the first contact portion is an inclined surface or a curved surface, and at least one of the second contact portion and the step portion is an inclined surface, a curved surface or a flat surface.

According to the plate mounting structure, the hole piece penetrates through the first fixing piece, and the second fixing piece is internally provided with the fixing hole which penetrates through the second fixing piece so that a screw can penetrate through the fixing hole.

According to the plate mounting structure, the plate and the keel piece are vertically arranged, the first connecting piece is arranged along the length direction of the keel piece, and the second connecting piece is arranged along the length direction of the plate.

According to the plate mounting structure, the first connecting piece or the second connecting piece is a T-shaped groove or a Y-shaped groove, and the third connecting piece or the fourth connecting piece is a T-shaped piece or a Y-shaped piece. Wherein the T-shaped piece and the T-shaped groove comprise a T-shaped or T-like structure in cross section.

According to the plate mounting structure, the third connecting piece comprises a limiting rib, and the fourth connecting piece comprises a limiting groove.

According to the plate mounting structure, the Y-shaped groove comprises at least one inclined inner wall which is obliquely arranged, and the Y-shaped part comprises at least one inclined outer wall which is correspondingly obliquely arranged; the T-shaped groove comprises at least one horizontally arranged straight inner wall, and the T-shaped piece comprises at least one horizontally arranged straight outer wall.

A plate fixing component is provided with a third connecting piece and a fourth connecting piece which are respectively used for being connected with a keel piece and a plate.

The fixing assembly comprises a first fixing piece and a second fixing piece, a third connecting piece is arranged on the second fixing piece, a fourth connecting piece is arranged on the first fixing piece, a first matching piece is arranged on the first fixing piece, a second matching piece is arranged on the second fixing piece, and the first matching piece and the second matching piece are mutually clamped and matched to enable the first fixing piece and the second fixing piece to be detachably matched. The first fitting piece and the second fitting piece are respectively a convex block and a concave position which are correspondingly arranged, or two convex blocks which are arranged in a staggered mode, so that the purpose of clamping and matching between the first fitting piece and the second fitting piece is achieved.

According to the plate fixing assembly, at least one of the first fitting piece and the second fitting piece is an inclined surface or a curved surface so as to facilitate quick separation of the first fitting piece and the second fitting piece.

According to the plate fixing assembly, the first fixing piece and the second fixing piece are respectively provided with a hole piece and a convex piece; the hole member includes a first hole portion and a second hole portion, and the first hole portion has an inner diameter larger than that of the second hole portion to form a step portion that can serve as a first fitting. The convex part comprises a column part and a convex part, and the outer diameter of the convex part is larger than that of the column part so as to form a second fitting part capable of being matched with the first fitting in a clamping manner.

According to the above plate fixing assembly, the convex part further comprises a notch, and the notch is arranged on the convex part to separate the convex part.

According to the plate fixing assembly, the convex part comprises a first contact part and a second contact part so as to guide when the first fixing part and the second fixing part are clamped in or pulled out respectively; the first contact part is an inclined plane or a curved surface, and at least one of the second contact part and the step part is an inclined plane, a curved surface or a plane.

According to the plate fixing assembly, the hole piece penetrates through the first fixing piece and is arranged, and the second fixing piece is internally provided with a fixing hole which penetrates through the second fixing piece.

According to the plate fixing assembly, the third connecting piece and the fourth connecting piece are arranged perpendicularly to each other.

According to the above-mentioned plate fixing assembly, the third connecting member or the fourth connecting member is a T-shaped member or a Y-shaped member, the Y-shaped member includes at least one inclined outer wall which is obliquely arranged, and the T-shaped member includes at least one horizontally arranged straight outer wall.

According to the above plate fixing assembly, the third connecting piece comprises a limiting rib, and the fourth connecting piece comprises a limiting groove.

This implement neotype panel mounting structure and panel fixed subassembly, can only, firmly be connected to the fossil fragments with panel through the structural cooperation relation of physics on, needn't use the screw just can fix to can simplify the installation.

And, the utility model discloses a mounting structure and fixed subassembly still have the characteristics of dismantling fast and assembling, and the user draws panel to the upper lift and can realize demolising the operation. The panel can be installed again after being detached, or can be installed again after being positioned oppositely through the two fixing pieces, or after one fixing piece is taken down from the keel piece or the panel in a sliding mode and then is matched and clamped with the other fixing piece, the panel is operated to move along the arrangement direction of the first connecting piece or the second connecting piece, and then the panel is matched again.

In addition, this implement neotype mounting structure and fixed subassembly, also support the screw through extra setting up in order to realize fixed subassembly for fossil fragments piece or fixed subassembly and the holistic fastening of fossil fragments piece.

Drawings

Fig. 1 is a schematic view of a fitting structure of a plate mounting structure according to an embodiment of the present invention;

FIG. 2 is an exploded view of the embodiment of FIG. 1;

FIG. 3 is an end elevational view of the sheet of the embodiment of FIG. 1;

FIG. 4 is an end elevational view of the keel of the embodiment of FIG. 1;

FIG. 5 is a schematic view of the embodiment of FIG. 1 showing the engagement of the fixation assembly with the keel;

FIG. 6 is a perspective view of the retaining assembly of the embodiment of FIG. 1;

FIG. 7 is an exploded view of the securing assembly of FIG. 6;

FIG. 8 is a cross-sectional view and a partially enlarged schematic view of the fixing assembly of FIG. 6;

FIG. 9 is a cross-sectional view of a first attachment member of the attachment assembly of FIG. 6;

FIG. 10 is a top view schematic of a second securing member of the securing assembly of FIG. 6;

FIG. 11 is a bottom view of a second fastener element of the fastening assembly of FIG. 6;

fig. 12a is a schematic perspective view of a plate according to another embodiment of the present invention;

FIG. 12b is an end elevational view of the sheet of material of the FIG. 12a embodiment;

fig. 13 is an exploded view of a second fixing member and a keel according to another embodiment of the invention.

Detailed Description

In order to better understand the invention for those skilled in the art and to define the claimed scope more clearly, the invention will be described in detail below with respect to certain specific embodiments of the invention. It should be noted that the following description is only a few examples of the present invention, and the specific and direct descriptions of the related structures are only for the convenience of understanding the present invention, and the specific features do not naturally and directly limit the scope of the present invention. Conventional alternatives and substitutions made by those skilled in the art in light of the teachings of the present disclosure should be considered as within the scope of the present disclosure.

As shown in fig. 1, a panel installation structure is composed of a keel member 11, a fixing member 20 and a panel 12, and the number of keel members 11, fixing members 20 and panels 12 may be set as required, so that the panel 12 is connected to the keel member 11 via the fixing member 20 to form the panel installation structure. Fig. 1 shows a schematic view of a plate 12 fixed to two keels 11 by four fixing assemblies 20; obviously, when there are more sheets, they can be arranged in parallel, and when the length of the sheet 12 is increased, correspondingly more keel members 11 can be added in parallel.

As shown in fig. 2, the keel member 11 is provided with a first connecting member 13 along the length direction thereof, and the plate member 12 is also provided with a second connecting member 14 along the length direction thereof.

As shown in fig. 3 and 4, in the present embodiment, each keel member 11 has a first connecting member 13, and the back surface of each plate 12 is provided with two second connecting members 14 in parallel and at intervals. The second connecting member 14 is a Y-shaped slot having two inclined inner walls 141 arranged oppositely and obliquely (relative to the surface of the plate), and the opening of the second connecting member 14 is smaller than its inner dimension to form the Y-shaped slot. Of course, the Y-shaped groove may have only one inner inclined wall 141 or two inner inclined walls 141 with different angles. The first connecting member 13 is a T-shaped groove having a cross-sectional shape of a T-shaped inner cavity and having two horizontally arranged straight inner walls 131 formed at both sides thereof, respectively. The first connecting member 13 and the second connecting member 14 can form a limit relation in the up-down direction after being matched with the fixing component 20.

Although fig. 3 shows the case where there are two second connection members 14 formed of Y-shaped grooves arranged in parallel, when the plate material mounting structure of the present embodiment is used in other application scenarios, the number of the second connection members 14 is not limited to two, and may be more or less.

As shown in fig. 1 and 2, the sheet material 12 and keel member 11 are disposed perpendicular to each other so that the sheet material 12 is secured in all directions after being attached to keel member 11 by the securing assembly 20. That is, the plate 12 is limited by the fixing component 20 in the up-down direction and cannot move, and the fixing component 20 alone can slide relative to the first connecting component 13 or the second connecting component 14 in the arrangement direction thereof, but when the plate 12 is arranged perpendicular to the keel component 11, the movement of the fixing component 20 in two horizontal directions (i.e., the arrangement directions of the first and second connecting components 13, 14) is prohibited, so that the plate 12 can be firmly fixed.

As shown in FIG. 5, when the sheet material 12 is removed, the fixing element 20 forms a fitting effect in the first connecting member 13 as shown in the figure. Thus, the securing assembly 20 is preferably slid into the first connector 13 along both ends of the keel member 11 and displaced into position for engagement of the sheet 12.

As shown in fig. 6, the fixing assembly 20 is correspondingly provided with a third connecting member 15 and a fourth connecting member 16, the first connecting member 13 is used for being matched with the third connecting member 15, and the second connecting member 14 is used for being matched with the fourth connecting member 16, so as to form a limiting effect at least along the up-down direction.

In this embodiment, the third connecting member 15 is a T-shaped member, which includes two straight outer walls that are symmetrically and horizontally disposed for being engaged with the first connecting member 13. The fourth connecting member 16 is a Y-shaped member, which also includes two outer walls with two inclined surfaces, which are symmetrically and obliquely disposed, so as to be engaged with the second connecting member 14.

Of course, the two pairs of concave-convex matching structures of the first connecting piece 13 and the third connecting piece 15 and the second connecting piece 14 and the fourth connecting piece 16 can be exchanged; or both the two structures are Y-shaped concave-convex matching structures or T-shaped concave-convex matching structures.

As shown in fig. 7, to facilitate the detachment of the sheet material 12, the fixing assembly 20 is further composed of two parts, namely a first fixing member 21 and a second fixing member 22. The third connecting element 15 is disposed on the second fixing element 22, the fourth connecting element 16 is disposed on the first fixing element 21, and the first fixing element 21 and the second fixing element 22 are detachably engaged with each other. Thus, when the sheet 12 needs to be removed, there are two ways of removing: first, as shown in fig. 2, a force is applied to the plate 12 in the direction in which the first connecting member 13 or the second connecting member 14 is disposed, so that it is displaced alone or together with the fixing member 20, to achieve the detachment of the plate 12; secondly, as shown in fig. 2, an upward force is applied to the panel 12 to separate the first fixing member 21 from the second fixing member 22, thereby achieving the quick removal of the panel 12.

As shown in fig. 7, the first fixing member 21 and the second fixing member 22 are respectively provided with a hole member 210 and a protrusion member 220, which are engaged with each other to achieve a detachable connection. The orifice 210 includes a first hole portion 211 and a second hole portion 212, the first hole portion 211 having an inner diameter larger than that of the second hole portion 212 to form a step 213 as a first fitting, the step 213 being disposed substantially horizontally. The male member 220 includes a post portion 221 and a male portion 230, and the male portion 230 has an outer diameter larger than that of the post portion 221 to form a second fitting member for snap-fit engagement with the first fitting member so as to be detachably fitted therebetween.

Besides the structure, the first fitting piece and the second fitting piece can also be correspondingly arranged convex blocks and concave positions respectively, or alternatively arranged two convex blocks respectively, so as to realize the purpose of mutual clamping and matching. Preferably, at least one of the first fitting member and the second fitting member is a slant surface or a curved surface, so as to facilitate the quick separation of the first fitting member and the second fitting member.

Also, the male member 220 further includes a notch 223, and the notch 223 is disposed on the male part 230 to block it. In this embodiment, there are two notches 223 that divide the protrusion 230 into left and right portions to allow the deformation of the protrusion 220. That is, the hole member 210 and the protrusion member 220 are not only dependent on the deformation characteristics of the two materials when being engaged or disengaged, but also can be engaged or disengaged by the structural deformation at the notch 223. Of course, it is also possible to have only one notch 223 to divide the consecutive projections 230, or more than 3 notches to divide the projections 230 into a greater number.

As shown in fig. 9, in the present embodiment, the hole member 210 is disposed to penetrate the first fixing member 21.

Of course, it is also possible to arrange the hole member 210 not to penetrate through the first fixing member 21, that is, the first fixing member 21 has a complete upper surface, and the hole member 210 is hollowed out from the lower side thereof.

As shown in fig. 8 and 10-11, the protruding portion 230 includes a first contact portion 231 and a second contact portion 232 for guiding when the first fixing member 21 and the second fixing member 22 are snapped in or out, respectively.

In this embodiment, the first contact portion 231 is an inclined surface (a tapered surface), the second contact portion 232 is a curved surface, and the step portion 213 is a flat surface. Of course, the shapes of the first contact portion 231, the second contact portion 232 and the step portion 213 may be changed or specifically set on the basis of meeting the requirement of the engagement and disengagement, that is, the shapes are selected from an inclined plane, a curved plane or a flat plane and are correspondingly set, and only the two parts which are matched with each other need to be engaged and disengaged.

As shown in fig. 8, when the male member 220 is snapped into the female member 210, the second contact portion 232 formed of a curved surface interacts with the step portion 213 formed of a flat surface to form an upper and lower limit fitting relationship. When the plate 12 is acted by an upward force, the protruding portion 230 is deformed due to the guiding effect of the second contact portion 232, so that the protruding member 220 is released from the hole member 210 to separate the first fixing member 21 from the second fixing member 22.

When it is necessary to re-engage the first fixing member 21 with the second fixing member 22, the first contact portion 231 interacts with the lower end face of the second hole portion 212 to deform the protrusion portion 230 to be re-clamped into the hole member 210, so as to achieve a connection engagement therebetween.

As shown in fig. 8, a fixing hole 224 is further formed in the second fixing element 22, and the fixing hole 224 is used for a fixing screw to pass through so as to fix the second fixing element 22 to the keel element 11, so that it is changed from an originally movable arrangement in the first connecting element 13 to a fixed arrangement; alternatively, the fixing screw passing through the fixing hole 224 may further pass through the second fixing member 22 to fix it to other surfaces, such as the ground, thereby achieving the function of fixing the keel and the second fixing member 22 at the same time.

As shown in fig. 4, in the present embodiment, the keel member 21 is a hollow keel, which is formed by extrusion molding or the like of metal or alloy, and a hollow cavity 132 is further formed in the keel member 11.

Although, in the present embodiment, the second hole portion 212 provided at the lower portion of the second fixing member 22 has a continuous lower opening, and the engagement of the two is achieved by providing the notch 223 on the male member 220. However, it is also possible to form the notch 223 at the second hole portion 212 as well; at this time, whether the recess 223 is formed on the male member 220 is not limited.

In addition, as shown in fig. 12a, the second connecting member 14 located on the lower surface of the plate 12 may be a Y-shaped groove as shown in fig. 3, or a T-shaped groove as shown in fig. 12b, and the first fixing member 21 may have a matching shape to be limited by the limiting plane 142 provided in the second connecting member 14.

Or, the third connecting piece 15 is in a rectangular or trapezoidal strip shape, and the side wall thereof is provided with a limiting rib 151; correspondingly, the fourth connecting member 16 is an elongated groove into which the third connecting member 15 can be fitted, and the inner sidewall thereof is provided with a limiting groove 161 engaged with the limiting rib 151 for limiting in the up-down direction.

As shown in fig. 6-11, a panel securing assembly, constructed as described above, is provided between the panel 12 and the keel member 11 to connect the two. The first fixing member 21 and the second fixing member 22 are rotatably engaged with each other, but when the fixing assembly is used for fixing a plate material, the third connecting member 15 of the second fixing member 22 and the fourth connecting member 16 of the first fixing member 21 are arranged perpendicular to each other.

Claims

1. A plate mounting structure comprises a keel member (11), a fixing assembly (20) and a plate (12), wherein the plate (12) is connected to the keel member (11) through the fixing assembly (20) to form the plate mounting structure; it is characterized in that the preparation method is characterized in that,

a first connecting piece (13) is arranged on the keel piece (11), a second connecting piece (14) is arranged on the plate (12), a third connecting piece (15) and a fourth connecting piece (16) are correspondingly arranged on the fixing component (20), the first connecting piece (13) is matched with the third connecting piece (15), and the second connecting piece (14) is matched with the fourth connecting piece (16);

fixed subassembly (20) include first mounting (21) and second mounting (22), third connecting piece (15) set up on second mounting (22), fourth connecting piece (16) set up on first mounting (21), be equipped with first fitting piece on first mounting (21), be equipped with the second fitting piece on second mounting (22), first fitting piece sets up with the mutual joint cooperation of second fitting piece ground to make detachably cooperate between first mounting (21) and second mounting (22).

2. The plate mounting structure according to claim 1, wherein the first mating member and the second mating member are respectively a protrusion and a recess which are correspondingly arranged, or are respectively two protrusions which are arranged in a staggered manner; at least one of the first fitting piece and the second fitting piece is an inclined surface or a curved surface so as to facilitate the quick separation of the first fitting piece and the second fitting piece.

3. The panel installation structure according to claim 2, wherein the first fixing member (21) and the second fixing member (22) are provided with a hole member (210) and a protrusion member (220), respectively;

the hole member (210) includes a first hole portion (211) and a second hole portion (212), the first hole portion (211) having an inner diameter larger than that of the second hole portion (212) to form a step portion (213) as a first fitting in the hole member (210); the male member (220) includes a post portion (221) and a protrusion (230), and the protrusion (230) has an outer diameter larger than that of the post portion (221) to form a second fitting.

4. A panel mounting structure according to claim 3, wherein said male member (220) further comprises a notch (223), the notch (223) being provided on the male portion (230) to partition it;

the convex part (230) comprises a first contact part (231) and a second contact part (232) for guiding when the first fixing piece (21) and the second fixing piece (22) are clamped in or pulled out respectively; the first contact portion (231) is an inclined surface or a curved surface, and at least one of the second contact portion (232) and the step portion (213) is an inclined surface, a curved surface or a flat surface.

5. A panel mounting structure according to claim 3 or 4, wherein said hole member (210) is provided through the first fixing member (21), and a fixing hole (224) is provided through the second fixing member (22).

6. A panel mounting arrangement according to any of claims 1-3, wherein the panels (12) and the keel member (11) are arranged perpendicular to each other, the first connecting member (13) being arranged along the length of the keel member (11) and the second connecting member (14) being arranged along the length of the panels (12);

the first connecting piece (13) or the second connecting piece (14) is a T-shaped groove or a Y-shaped groove, and the third connecting piece (15) or the fourth connecting piece (16) is a T-shaped piece or a Y-shaped piece.

7. The sheet mounting structure according to claim 6, wherein the Y-shaped groove includes at least one obliquely disposed beveled inner wall (141), and the Y-shaped member includes at least one correspondingly obliquely disposed beveled outer wall; the T-shaped groove comprises at least one horizontally arranged straight inner wall (131), and the T-shaped piece comprises at least one horizontally arranged straight outer wall; or the third connecting piece (15) comprises a limiting rib (151) and the fourth connecting piece (16) comprises a limiting groove (161).

8. A plate fixing component is provided with a third connecting piece (15) and a fourth connecting piece (16) which are respectively used for connecting a keel piece (11) and a plate (12); it is characterized in that the preparation method is characterized in that,

the fixing assembly (20) comprises a first fixing piece (21) and a second fixing piece (22), a third connecting piece (15) is arranged on the second fixing piece (22), and a fourth connecting piece (16) is arranged on the first fixing piece (21); the first fixing piece (21) is provided with a first matching piece, the second fixing piece (22) is provided with a second matching piece, and the first matching piece and the second matching piece are mutually clamped and matched so that the first fixing piece (21) and the second fixing piece (22) can be detachably matched;

the first fitting piece and the second fitting piece are respectively a convex block and a concave position which are correspondingly arranged, or are respectively two convex blocks which are arranged in a staggered way.

9. The panel securing assembly according to claim 8, wherein at least one of the first mating member and the second mating member is beveled or curved to facilitate quick separation thereof;

the first fixing piece (21) and the second fixing piece (22) are respectively provided with a hole piece (210) and a convex piece (220); the hole member (210) includes a first hole portion (211) and a second hole portion (212), the first hole portion (211) having an inner diameter larger than that of the second hole portion (212) to form a step portion (213) as a first fitting in the hole member (210); the male member (220) includes a post portion (221) and a protrusion (230), and the protrusion (230) has an outer diameter larger than that of the post portion (221) to form a second fitting.

10. A panel fixing assembly according to claim 9, wherein said male member (220) further comprises a notch (223), said notch (223) being provided on said male portion (230) to block it;

the convex part (230) comprises a first contact part (231) and a second contact part (232) for guiding when the first fixing piece (21) and the second fixing piece (22) are clamped in or pulled out respectively; the first contact part (231) is an inclined plane or a curved plane, and at least one of the second contact part (232) and the step part (213) is an inclined plane or a curved plane;

the hole piece (210) penetrates through the first fixing piece (21), and a fixing hole (224) penetrating through the second fixing piece (22) is formed in the second fixing piece;

the third connecting piece (15) or the fourth connecting piece (16) is a T-shaped piece or a Y-shaped piece, the Y-shaped piece comprises at least one inclined outer wall which is obliquely arranged, and the T-shaped piece comprises at least one horizontally arranged straight outer wall; or the third connecting piece (15) comprises a limiting rib (151) and the fourth connecting piece (16) comprises a limiting groove (161).