Concave aluminum alloy butt joint device and curtain wall

Abstract

The embodiment of the utility model provides a concave aluminum alloy butt joint device and a curtain wall. The curtain wall comprises a concave aluminum alloy butt joint device, the concave aluminum alloy butt joint device comprises a connecting piece, a decorative cover plate and a sealing assembly, the connecting piece is located in a butt joint of two adjacent rows of metal sandwich decorative plates, one end of the connecting piece is a fixed end arranged on a keel frame, and the other end of the connecting piece is a connecting end. The decorative cover plate covers the connecting end and can slide along the connecting end so as to meet the sliding requirement of thermal expansion and cold contraction and the butt joint requirement during installation. The sealing assembly is sealed between the connecting piece and the metal sandwich decorative plates, and the length of the sealing assembly in the width direction of the butt joint seam is adjustable, so that when the metal sandwich decorative plates on the two sides expand with heat and contract with cold due to temperature change, the deformation difference value is contained, connecting points are not damaged, and sealing performance is guaranteed. In addition, the decorative cover plate is located on the inner side of the outer side face of the metal sandwich decorative plate, so that gaps of the curtain wall are uniform from the appearance, and the appearance is more attractive.

Description

Technical Field

[0001] The utility model relates to the technical field, in particular to an inwardly concave aluminum alloy joint device and a curtain wall. Background Art

[0002] The curtain wall of a steel structure building usually uses multiple metal sandwich decorative panels arranged in sequence and covered on the outside of the purlin keel or concrete carrier to ensure the aesthetic appearance of the curtain wall. Usually, the two opposite long sides of the metal sandwich decorative panels are provided with interfaces that can be plugged into each other, which not only ensures the positioning connection between the downstream metal sandwich decorative panels and the upstream metal sandwich decorative panels, but also ensures good waterproofing, sealing and aesthetics. The two opposite short sides of the metal sandwich decorative panels are butt-jointed, so waterproofing and sealing measures are required between the two adjacent short sides of the two adjacent metal sandwich decorative panels, and aesthetics must also be taken. Traditional methods either cannot achieve both sealing and aesthetics, or are greatly affected by temperature changes and fail. Therefore, a butt joint decoration with strong temperature weather resistance, good airtightness, watertightness and other sealing properties, and ensuring the beautiful appearance of the curtain wall is urgently needed to be developed. Utility Model Content

[0003] In view of the above problems, an embodiment of the utility model is proposed. The purpose of the embodiment of the utility model is to provide an inwardly recessed aluminum alloy butt joint device with good airtightness, watertightness and other sealing properties, strong temperature and weather resistance, and the ability to ensure the aesthetic appearance of the curtain wall.

[0004] To achieve this purpose, the present invention adopts the following technical solutions:

[0005] An inwardly concave aluminum alloy butt joint device, comprising:

[0006] The connector is located in the butt joint between two adjacent rows or columns of metal sandwich decorative panels, one end of the connector is a fixed end arranged on the keel frame, and the other end is a connecting end;

[0007] A decorative cover plate is provided at the connection end and can slide along the connection end, and there is a gap between the two sides of the decorative cover plate and the metal sandwich decorative plate on the corresponding side, and the decorative cover plate is located on the inner side of the outer side of the metal sandwich decorative plate;

[0008] Sealing components are provided on both sides of the connector. The sealing components run through the curtain wall transversely. Both sides of the sealing components are respectively abutted against the corresponding connectors or metal sandwich decorative panels. The length of the sealing components is adjustable.

[0009] Preferably, the connecting end has a guide surface, both sides of the guide surface have protrusions, and the decorative cover plate has mounting legs for accommodating the protrusions and for slidingly abutting against the protrusions.

[0010] Preferably, the distance between the connecting piece and the outer side surface of the metal sandwich decorative panel is H, H=15 mm.

[0011] Preferably, the connecting pieces include multiple models, and the connecting pieces of different models have different lengths to correspond to the thicknesses of different metal sandwich decorative panels to ensure that H is consistent.

[0012] Preferably, the sealing assembly comprises:

[0013] A first sealing member is interference-fitted between the connecting member and the metal sandwich decorative panel;

[0014] The second sealing member is located between the first sealing member and the decorative cover plate, and is respectively connected to the connecting member, the first sealing member and the metal sandwich decorative plate on the corresponding side;

[0015] Both the first sealing member and the second sealing member are elastically deformable.

[0016] Preferably, the first sealing member is a foam rod;

[0017] The second sealing member is a sealant.

[0018] Preferably, the concave aluminum alloy butt joint device further comprises:

[0019] The mounting piece covers the inner side of the joint between two adjacent rows or columns of metal sandwich decorative panels, and the connecting piece is connected to the keel frame through the mounting piece.

[0020] Preferably, the concave aluminum alloy butt joint device further comprises:

[0021] Anti-corrosion gasket, located between the mounting part and the fixed end.

[0022] Preferably, the connecting piece and the decorative cover plate are both made of aluminum alloy.

[0023] Another purpose of the embodiments of the present invention is to provide a curtain wall with beautiful appearance and good sealing performance.

[0024] To achieve this purpose, the present invention adopts the following technical solutions:

[0025] A curtain wall, comprising:

[0026] keel frame;

[0027] Metal sandwich decorative panels, multiple metal sandwich decorative panels are sequentially connected and covered on the outside of the keel frame;

[0028] The inwardly recessed aluminum alloy butt joint device is located between the butt joints of two adjacent rows or columns of metal sandwich decorative panels to seal and decorate the butt joints. The inwardly recessed aluminum alloy butt joint device is the inwardly recessed aluminum alloy butt joint device mentioned above.

[0029] The technical solution provided by the embodiment of the utility model satisfies the sliding requirements of thermal expansion and contraction and the docking requirements during installation by slidably setting the decorative cover plate at the connecting end of the connecting piece. The sealing component is sealed between the connecting piece and the metal sandwich decorative panel on the corresponding side, and the length is adjustable, which can not only ensure good sealing but also accommodate the deformation difference of the metal sandwich decorative panels on both sides when they expand and contract due to temperature changes without damaging the connection points, thereby further ensuring the sealing. In addition, the decorative cover plate is located on the inner side of the outer side of the metal sandwich decorative panel, so that the gap of the curtain wall is uniform and the appearance is more beautiful. Therefore, the adjacent long sides of the two adjacent metal sandwich decorative panels of the curtain wall using the concave aluminum alloy butt joint device have good sealing, and the curtain wall is more beautiful as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 A schematic diagram of the structure of a curtain wall provided in one embodiment of the utility model;

[0032] Figure 2 A cross-sectional view of an inwardly recessed aluminum alloy butt joint device provided by an embodiment of the utility model;

[0033] Figure 3 A schematic diagram of the structure of a connecting piece provided in one embodiment of the utility model;

[0034] Figure 4 A schematic structural diagram of a decorative cover plate provided in one embodiment of the utility model.

[0035] In the figure:

[0036] 100. Inward-recessed aluminum alloy butt joint device; 200. Metal sandwich decorative panel;

[0037] 110, connecting piece; 111, fixing end; 112, connecting end; 1121, guide surface; 1122, protrusion; 113, middle part;

[0038] 120, decorative cover plate; 121, cover plate; 122, mounting legs; 1221, groove;

[0039] 130, sealing assembly; 131, first sealing member; 132, second sealing member;

[0040] 140. Mounting parts;

[0041] 150. Anti-corrosion gasket. DETAILED DESCRIPTION

[0042] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0043] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0045] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0046] Figure 1 A schematic diagram of the structure of a curtain wall provided in one embodiment of the utility model is shown in FIG. Figure 1 shown.

[0047] The present embodiment provides a curtain wall, which includes a keel frame, a metal sandwich decorative panel 200, and a concave aluminum alloy joint device 100. A plurality of metal sandwich decorative panels 200 are sequentially connected and covered on the curtain wall. The metal sandwich decorative panels 200 are usually rectangular. In order to ensure the accuracy of curtain wall installation and facilitate operation, the two long sides of the metal sandwich decorative panels 200 are usually provided with mutually matching plug-in interfaces, so that the downstream metal sandwich decorative panel 200 and the upstream metal sandwich decorative panel 200 can ensure good sealing after being plugged in, so as to be waterproof, airproof and dustproof. The adjacent short sides of two adjacent metal sandwich decorative panels 200 are butt-jointed. The butt-jointing method makes it impossible to achieve strict sealing between the two adjacent metal sandwich decorative panels 200. Even if they are fitted, there will be a certain small gap, so that a butt joint will be generated at the butt joint.

[0048] In order to ensure the aesthetics of the curtain wall, the metal sandwich decorative panels 200 are arranged longitudinally along the height direction of the curtain wall, that is, the long side of the metal sandwich decorative panels 200 is along the height direction of the curtain wall, and the short side is along the lateral direction of the curtain wall, then the butt joint is located between two adjacent rows of metal sandwich decorative panels 200, which is a butt joint that runs through the curtain wall horizontally. The metal sandwich decorative panels 200 can also be arranged horizontally, that is, the long side of the metal sandwich decorative panels 200 is along the lateral direction of the curtain wall, and the short side is along the height direction of the curtain wall, then the butt joint is located between two adjacent rows of metal sandwich decorative panels 200, which is a butt joint that runs through the curtain wall vertically.

[0049] Considering that the metal sandwich decorative panel 200 will expand and contract due to temperature changes, resulting in changes in shape and size, the joint between two adjacent metal sandwich decorative panels 200 needs to have the ability to accommodate deformation. Therefore, the joint is usually 20mm. In order to ensure the overall waterproof and dustproof effect of the curtain wall, the gap will be blocked. There are two common practices. One is to paste aluminum alloy decoration on the outside. The aluminum alloy is made into a "J" shape. The side wings on both sides are pasted on both sides of the outside of the metal sandwich decorative panel 200, and nailed in the concave position to achieve decoration and waterproof effects. Often, butyl tape is added at the joint position between the two side wings and the wall panel for waterproofing. Butyl tape is easy to get dusty and affects the appearance. If butyl tape is not set, it will lead to poor waterproof sealing. And pasting a "J"-shaped piece on the outside of the sandwich panel will affect the beauty of the overall wall. Another method is to insert EPDM strips into the joints for waterproofing. However, the EPDM strips will expand and contract as the temperature changes, causing the gap to increase, affecting the waterproofing effect of the joints. The strips are prone to aging, affecting the aesthetics of the exterior wall.

[0050] To solve the above problems, the curtain wall of this embodiment also includes a recessed aluminum alloy butt joint device 100. When the butt joint runs through the curtain wall horizontally, the recessed aluminum alloy butt joint device 100 is located in the butt joint of two adjacent rows of metal sandwich decorative panels. When the butt joint runs through the curtain wall vertically, the recessed aluminum alloy butt joint device 100 is located in the butt joint of two adjacent rows of metal sandwich decorative panels. The recessed aluminum alloy butt joint device 100 can block the gap between adjacent long sides without being affected by thermal expansion and contraction, which not only ensures good sealing but also ensures that all gaps in the entire curtain wall are uniform, thereby making the appearance of the curtain wall more beautiful.

[0051] Figure 2 This is a cross-sectional view of a concave aluminum alloy butt joint device provided by an embodiment of the utility model. Figure 2 The recessed aluminum alloy butt joint device is described in detail.

[0052] Please refer to Figure 2 In some achievable embodiments of the present invention, a structure of the concave aluminum alloy joint device 100 includes a connector 110, a decorative cover plate 120 and a sealing assembly 130, wherein the connector 110 is located in the joint between two adjacent rows or columns of metal sandwich decorative panels 200, one end of the connector 110 is a fixed end 111 disposed on the keel frame, and the other end is a connecting end 112, and the decorative cover plate 120 is covered on the connecting end 112 and can slide along the connecting end 112 to meet the sliding requirements of thermal expansion and contraction and the docking requirements during installation, thereby reducing the deformation effect of thermal expansion and contraction caused by temperature changes and installation errors. The decorative cover plate 120 is located on the inner side of the outer side of the metal sandwich decorative panel 200 to prevent the concave aluminum alloy joint device 100 from leaking out, so that the curtain wall has multiple uniform strip-shaped decorative transverse seams in appearance, making the appearance beautiful. There are sealing components 130 on both sides of the connecting piece 110. The two sides of the sealing component 130 are respectively abutted against the corresponding connecting piece 110 or the metal sandwich decorative panel 200 to ensure good watertightness, airtightness and other sealing properties. The length of the sealing component 130 is adjustable along the direction of the joint width. There is a gap between the two sides of the decorative cover plate 120 and the metal sandwich decorative panel 200 on the corresponding side, so as to accommodate the displacement difference when the metal sandwich decorative panel 200 is affected by temperature and produces thermal expansion and contraction. The sealing component 130 can accommodate the displacement difference by adjusting the length without damaging the connection point, thereby ensuring the sealing life.

[0053] In order to facilitate the stable installation of the decorative cover plate 120 on the connecting end 112, in some achievable embodiments of the present invention, a possible structure of the connecting end 112 is that the connecting end 112 has a guide surface 1121, and protrusions 1122 are provided on both sides of the guide surface 1121. The decorative cover plate 120 has a mounting leg 122 that accommodates the protrusion 1122 and slides against the protrusion 1122. After the mounting leg 122 abuts against the guide surface 1121, it will slide along the guide surface 1121 under the action of external force to pass over the protrusion 1122 and accommodate the protrusion 1122 in the mounting leg 122. The protrusion 1122 cooperates with the mounting leg 122 to limit the position of the decorative cover plate 120 on the connecting end 112, and the protrusion 1122 can serve as a track, so that the mounting leg 122 slides along the protrusion 1122, so as to realize the sliding of the decorative cover plate 120 along the connecting member 110.

[0054] Figure 3 This is a schematic diagram of the structure of a connecting member 110 provided in an embodiment of the present utility model. Figure 4 For a structural diagram of a decorative cover plate 120 provided in an embodiment of the present invention, please refer to Figure 2 to Figure 4 .

[0055] Specifically, the decorative cover 120 includes a cover 121 and two mounting legs 122 located on the inner side of the cover 121. The free ends of the two mounting legs 122 protrude in a direction away from each other and have a groove 1221 that is in the shape of the protrusion 1122 to accommodate the protrusion 1122 and fit with the protrusion 1122. The guide slope is an arc surface, and the protrusion 1122 is a triangle. The two mounting legs 122 are located on both sides of the connecting end 112. After the free ends of the mounting legs 122 abut against the arc-shaped guide surface 1121, they slide along the guide surface 1121 and along the side of the triangular protrusion 1122 under the action of external force until the groove 1221 accommodates the protrusion 1122, thereby realizing the installation of the decorative cover 120 and facilitating operation.

[0056] In order to make the outer surface of the curtain wall more beautiful, the color and width of the gap on the curtain wall are uniform when viewed from the outside. As an optional solution, the distance between the connector 110 and the outer side of the metal sandwich decorative panel 200 is H, H = 15mm. The distance of 15mm makes it impossible to see the concave aluminum alloy butt joint device 100 when the curtain wall is viewed from the outside. Due to the different thicknesses of different metal sandwich decorative panels 200, in some embodiments of the utility model, different types of connectors 110 have different lengths to correspond to the thickness of different metal sandwich decorative panels 200 to ensure that H is consistent. Not only does it make the application range of the concave aluminum alloy butt joint device 100 wider, but it can also ensure the beauty of the curtain wall.

[0057] In some embodiments of the present invention, please refer to Figure 2One possible structure of the sealing assembly 130 is that the sealing assembly 130 includes a first sealing member 131 and a second sealing member 132, wherein the first sealing member 131 is interference-fitted between the connector 110 and the metal sandwich decorative panel 200, so that the first sealing member 131 is always in contact with the connector 110 and the short side of the metal sandwich decorative panel 200, thereby ensuring good sealing. In order to enhance the installation strength of the first sealing member 131, the second sealing member 132 is located between the first sealing member 131 and the decorative cover plate 120, and is respectively connected to the connector 110, the first sealing member 131, and the short side of the metal sandwich decorative panel 200 on the corresponding side, which can not only further block the gap between the connector 110 and the metal sandwich decorative panel 200 to ensure sealing, but also fix the position of the first sealing member 131 to ensure that the first sealing member 131 will not shift. In addition, both the first seal 131 and the second seal 132 can be elastically deformed. When two adjacent metal sandwich decorative panels 200 are affected by temperature and produce thermal expansion and contraction deformation, the first seal 131 and the second seal 132 can undergo corresponding elastic deformation according to the deformation amount to eliminate the influence of thermal expansion and contraction and ensure the sealing between the connecting piece 110 and the metal sandwich decorative panel 200.

[0058] In some embodiments of the present invention, the first sealing member 131 is a foam rod, and the second sealing member 132 is a sealant, which may be a silicone sealant. The first sealing member 131 can not only achieve the sealing function but also isolate the temperature transmission, thereby achieving the effect of heat preservation. Under the action of the double sealing members, the gap between the adjacent long sides of two adjacent metal sandwich decorative panels 200 is better sealed.

[0059] Furthermore, regardless of whether the joint is a horizontal or vertical through-curtain wall, since the length of the second sealing member 132 is flexibly adjustable, the length of the second sealing member 132 can be set continuously without being affected by the width or height of the curtain wall. Considering the wide application of the inward-recessed aluminum alloy joint device 100, the inward-recessed aluminum alloy joint device 100 can be suitable for curtain walls of different heights and widths. In some embodiments of the utility model, the connecting member 110, the decorative cover plate 120, and the first sealing member 131 are all connected in sequence in a whole joint to adapt to the length of the joint, reduce the difficulty of processing and transportation, and facilitate assembly operations.

[0060] To ensure the stability of the connection between the recessed aluminum alloy butt joint device 100 and the keel frame, please refer to Figure 2In some embodiments of the present invention, the concave aluminum alloy butt joint device 100 further includes a mounting member 140, which covers the inner side of the butt joint of two adjacent rows or columns of metal sandwich decorative panels 200, and the connecting member 110 is connected to the keel frame through the mounting member 140. In addition, the end of the long side of the metal sandwich decorative panel 200 is also supported on the mounting member 140 and fixed to the mounting member 140 by self-tapping screws, which can not only further enhance the installation strength of the metal sandwich decorative panel 200 on the keel frame, but also enable the concave aluminum alloy butt joint device 100 to be stably installed on the keel frame, avoiding the situation that the concave aluminum alloy butt joint device 100 cannot be installed due to other components installed on the keel frame. As an optional solution, the mounting member 140 is a C-shaped steel or square tube or other profiles.

[0061] In some embodiments of the present invention, the decorative cover plate 120 and the connecting member 110 are made of aluminum alloy, which has good anti-corrosion properties, thereby preventing corrosion caused by long-term contact with the outside world, and thus has a long service life. The mounting member 140 is often made of steel, so when the connecting member 110 is installed on the mounting member 140, due to the different materials, an electrochemical reaction will occur, which will accelerate the corrosion of the two. In order to avoid this situation, please refer to Figure 2 As an optional solution, the concave aluminum alloy butt joint device 100 further includes an anti-corrosion gasket 150, which is located between the mounting member 140 and the fixed end 111, isolating the mounting member 140 from the fixed end 111 of the connecting member 110, thereby avoiding the occurrence of electrochemical reactions and ensuring the service life of the mounting member 140 and the connecting member 110. In addition, the anti-corrosion gasket 150 also extends between the mounting member 140 and the metal sandwich decorative panel 200, thereby also achieving sealing to prevent water, air or dust from passing through.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A concave aluminum alloy butt joint device, characterized in that: include: A connecting piece (110) is located in the butt joint between two adjacent rows or columns of metal sandwich decorative panels (200), one end of the connecting piece (110) is a fixed end (111) disposed on the keel frame, and the other end is a connecting end (112); A decorative cover plate (120) is disposed on the connection end (112) and is capable of sliding along the connection end (112), with gaps between two sides of the decorative cover plate (120) and the metal sandwich decorative plate (200) on the corresponding sides, and the decorative cover plate (120) is located on the inner side of the outer side of the metal sandwich decorative plate (200); A sealing component (130) is provided on both sides of the connecting piece (110), the two sides of the sealing component (130) are respectively in contact with the corresponding connecting piece (110) or the metal sandwich decorative panel (200), and the length of the sealing component (130) is adjustable along the direction of the width of the butt joint.

2. The recessed aluminum alloy butt joint device according to claim 1, characterized in that: The connecting end (112) has a guide surface (1121), and both sides of the guide surface (1121) have protrusions (1122). The decorative cover plate (120) has mounting legs (122) that accommodate the protrusions (1122) and are in sliding contact with the protrusions (1122).

3. The recessed aluminum alloy butt joint device according to claim 1, characterized in that: The distance between the connecting piece (110) and the outer side surface of the metal sandwich decorative panel (200) is H, where H=15 mm.

4. The recessed aluminum alloy butt joint device according to claim 3, characterized in that: The connecting piece (110) includes multiple models, and the connecting pieces (110) of different models have different lengths, so as to correspond to the thicknesses of the different metal sandwich decorative panels (200) and ensure that H is consistent.

5. The recessed aluminum alloy butt joint device according to claim 1, characterized in that: The sealing assembly (130) comprises: A first sealing member (131) is interference-fitted between the connecting member (110) and the metal sandwich decorative panel (200); A second sealing member (132) is located between the first sealing member (131) and the decorative cover plate (120), and is respectively connected to the connecting member (110), the first sealing member (131), and the metal sandwich decorative plate (200) on the corresponding side; The first sealing member (131) and the second sealing member (132) are both capable of elastic deformation.

6. The recessed aluminum alloy butt joint device according to claim 5, characterized in that: The first sealing member (131) is a foam rod; The second sealing member (132) is a sealant.

7. The inwardly recessed aluminum alloy butt joint device according to any one of claims 1 to 6, characterized in that: The inwardly recessed aluminum alloy butt joint device further comprises: The mounting member (140) covers the inner side of the joint between two adjacent rows or two adjacent columns of the metal sandwich decorative panels (200), and the connecting member (110) is connected to the keel frame through the mounting member (140).

8. The recessed aluminum alloy butt joint device according to claim 7, characterized in that: The inwardly recessed aluminum alloy butt joint device further comprises: An anti-corrosion gasket (150) is located between the mounting member (140) and the fixed end (111).

9. The inwardly recessed aluminum alloy butt joint device according to any one of claims 1 to 6, characterized in that: The connecting piece (110) and the decorative cover plate (120) are both made of aluminum alloy.

10. A curtain wall, characterized in that: include: keel frame; Metal sandwich decorative panels (200), a plurality of the metal sandwich decorative panels (200) are sequentially connected and covered on the outside of the keel frame; The inwardly recessed aluminum alloy butt joint device is located between the butt joints of two adjacent rows or columns of the metal sandwich decorative panels to seal and decorate the butt joints. The inwardly recessed aluminum alloy butt joint device is the inwardly recessed aluminum alloy butt joint device described in any one of claims 1 to 9.

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