Plug-in type concealed joint connecting structure of aluminum square tube decorative surface

Abstract

The utility model relates to the technical field of building decoration, in particular to a plug-in type concealed joint connecting structure of an aluminum square tube decorative surface, which comprises a first aluminum square tube, a second aluminum square tube and a connecting structure for connecting the first aluminum square tube and the second aluminum square tube, the connecting structure comprises an arc-shaped plate and supporting plates connected to the two sides of the arc-shaped plate, and an expansion driving mechanism is arranged between the two supporting plates and used for driving the two supporting plates to move outwards to abut against the inner wall of the first aluminum square tube and the inner wall of the second aluminum square tube. The expansion driving mechanism arranged inside is used for driving the supporting plates to move outwards, the supporting plates abut against the inner walls of the aluminum square tubes, therefore, stable and fixed connection of the two aluminum square tubes is achieved, and the problems that in the prior art, aluminum square tubes are unstable in connection and prone to loosening are solved.

Description

Technical Field

[0001] This utility model relates to the field of building decoration technology, and in particular to a plug-in concealed seam connection structure for aluminum square tube decorative surfaces. Background Technology

[0002] Aluminum square tubes (U-shaped square tubes, U-shaped channels), as a popular ceiling material, are widely used in modern architectural decoration due to their open view, good ventilation and breathability, and clean, neat lines. However, existing aluminum square tubes are usually made of fixed lengths. In actual installation, to meet the decorative needs of different space sizes, multiple aluminum square tubes often need to be spliced ​​together. Currently, the connection method between two aluminum square tubes is mostly a direct interlocking method. Although this connection method is relatively simple to operate, due to structural limitations, visible seams are easily formed at the joint of two aluminum square tubes. These seams disrupt the overall continuity and aesthetics of the aluminum square tube ceiling, especially in situations where high decorative effects are required. These obvious seams significantly affect the final visual effect, becoming a problem that urgently needs to be solved in the current installation of aluminum square tube ceilings. To address these issues, existing technology urgently needs improvement. Utility Model Content

[0003] This utility model discloses a plug-in concealed seam connection structure for aluminum square tube decorative surfaces, aiming to solve the problem of obvious seams at the existing aluminum square tube connections, which affects aesthetics.

[0004] The plug-in concealed seam connection structure of the aluminum square tube decorative surface includes a first aluminum square tube, a second aluminum square tube, and a connection structure for connecting the first aluminum square tube and the second aluminum square tube; wherein, the connection structure includes an arc plate and support plates connected to both sides of the arc plate, and an expansion drive mechanism is provided between the two support plates for driving the two support plates to move outward and abut against the inner walls of the first aluminum square tube and the second aluminum square tube.

[0005] Preferably, the arc-shaped plate is V-shaped and is integrally formed with the two support plates.

[0006] Preferably, the curved plate and the two support plates are all made of stainless steel.

[0007] Preferably, the expansion drive mechanism includes a threaded sleeve disposed inside the support plate, a left-hand threaded rod and a right-hand threaded rod respectively threadedly connected to the two threaded sleeves, and a rotating sleeve installed between the left-hand threaded rod and the right-hand threaded rod.

[0008] Preferably, there are two rotating sleeves, which are respectively connected to a left-hand threaded rod and a right-hand threaded rod, and a gear is installed between the two rotating sleeves.

[0009] Preferably, the expansion drive mechanism further includes a toothed belt, the teeth of which are adapted to gears.

[0010] Preferably, one end of the toothed belt is connected to a wrought iron wire.

[0011] Preferably, a concave rubber pad is provided on the outer side of the support plate, and the rubber pad is located at the joint between the first aluminum square tube and the second aluminum square tube.

[0012] Preferably, the inner wall of the support plate is fitted with reinforcing ribs, and the threaded sleeve is installed on the reinforcing ribs.

[0013] Preferably, the reinforcing rib is designed in an X shape, with its four ends extending to the four corners of the inner sidewall of the support plate.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] This utility model provides a plug-in concealed seam connection structure for aluminum square tube decorative surfaces. By plugging the connection structure into the interior of two aluminum square tubes, an internal expansion drive mechanism drives a support plate to move outward, pressing the support plate against the inner wall of the aluminum square tubes. This achieves a stable and fixed connection between the two aluminum square tubes, solving the problems of unstable and loose connections in existing technologies. Simultaneously, a rubber pad is placed at the abutting ends of the two aluminum square tubes. This rubber pad fills the gap at the connection point. After the connection is completed, the protruding rubber pad is trimmed and coated, effectively concealing the seam at the connection point and achieving a concealed seam effect for the aluminum square tube connection. This greatly enhances the overall aesthetics of the aluminum square tube ceiling and solves the problem of obvious seams at the connection points in existing technologies, which affect aesthetics. Attached Figure Description

[0016] Figure 1 A schematic diagram of the overall structure of the plug-in concealed seam connection structure for aluminum square tube decorative surfaces.

[0017] Figure 2 This is a schematic diagram of the installed plug-in concealed joint connection structure for aluminum square tube decorative surfaces.

[0018] Figure 3 This is a partial structural diagram of the plug-in concealed seam connection structure for aluminum square tube decorative surfaces.

[0019] Figure 4 A schematic diagram of the bent wrought iron wire structure for the plug-in concealed seam connection of aluminum square tube decorative surface.

[0020] Figure 5 A schematic diagram of the toothed belt in use for the plug-in concealed seam connection structure of aluminum square tube decorative surface.

[0021] In the diagram: 1. First aluminum square tube; 2. Rubber pad; 3. Second aluminum square tube; 4. Cast iron wire; 5. Rotating sleeve; 6. Toothed belt; 7. Gear; 8. Left-hand threaded rod; 9. Right-hand threaded rod; 10. Threaded sleeve; 11. Support plate; 12. Curved plate; 13. Reinforcing rib. Detailed Implementation

[0022] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0023] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] In the field of architectural decoration, especially in ceiling installation, aluminum square tubes are widely used due to their simplicity, aesthetics, and ventilation. However, since aluminum square tubes are usually available in fixed lengths, splicing is often required during actual installation to meet site size requirements. Existing splicing methods for aluminum square tubes are mostly simple end butt joints or snap-fit ​​connections, which easily leave obvious seams at the joints, ruining the overall visual effect of the ceiling and affecting its decorative aesthetics. To solve this technical problem, this utility model proposes an insert-type concealed seam connection structure for the decorative surface of aluminum square tubes. This structure, through a clever internal expansion and fixing mechanism and seam treatment method, achieves stable connection of aluminum square tubes and hides the seams, significantly improving the decorative effect.

[0025] This utility model discloses a plug-in concealed seam connection structure for aluminum square tube decorative surfaces, mainly used to connect a first aluminum square tube 1 and a second aluminum square tube 3. The first aluminum square tube 1 and the second aluminum square tube 3 are standard U-shaped or square aluminum profiles, serving as the main decorative components of the ceiling. The connection structure is the key component for connecting the two aluminum square tubes; this connection structure is designed to be plugged into the interior of the aluminum square tubes. To achieve a concealed seam effect at the connection, a rubber pad 2 is usually provided at the abutting point of the ends of the first aluminum square tube 1 and the second aluminum square tube 3. This rubber pad 2 has a certain elasticity, which can fill the gap when the two aluminum square tubes are joined, and can be trimmed and surface-treated after the connection is fixed. The connection structure includes an arc-shaped plate 12, support plates 11 connected to both sides of the arc-shaped plate 12, and an expansion drive mechanism disposed between the two support plates 11. The arc-shaped plate 12 serves as the base or support part of the connection structure, connecting the two support plates 11. The support plates 11 are components that directly contact the inner wall of the aluminum square tube and generate friction. The expansion drive mechanism is used to drive the two support plates 11 to move outward, so that they are in close contact with the inner walls of the first aluminum square tube 1 and the second aluminum square tube 3, thereby achieving the fixation of the connection structure and the stable connection between the two aluminum square tubes.

[0026] Specifically, the connecting structure is designed to be inserted into the internal cavities of the first aluminum square tube 1 and the second aluminum square tube 3. An arc-shaped plate 12 is located at the bottom of the connecting structure and connects to the support plates 11 on both sides. The support plates 11 are two generally planar plate-like structures, with their outer surfaces designed to contact the inner walls of the aluminum square tubes. An expansion drive mechanism is positioned between the two support plates 11, and its function is to convert external or internal operations into a force that pushes the two support plates 11 away from each other through some mechanical transmission method. For example, the expansion drive mechanism can use various methods such as threaded transmission, rack and pinion transmission, or lever mechanism to expand the support plates 11. As one possible implementation, the expansion drive mechanism can include a combination of a threaded rod and a threaded sleeve, where rotating the threaded rod drives the threaded sleeve to move linearly, thereby pushing the support plates 11 to expand. The support plates 11 can be made of materials with certain strength and rigidity, such as metal or high-strength plastic, to ensure that they can effectively press against the inner walls of the aluminum square tubes. The shape and material of the curved plate 12 can also be selected according to actual needs. Its main function is to connect and support the support plate 11, and may help to position the connecting structure inside the aluminum square tube.

[0027] Compared to existing technologies that rely on simple snap-fit ​​or butt-joint connections, the plug-in concealed seam connection structure of this utility model for aluminum square tube decorative surfaces has significant advantages. Existing snap-fit ​​connections have limited strength, are prone to loosening during use, and leave noticeable gaps at the joints, affecting the overall aesthetics. This utility model, by incorporating an expansion drive mechanism within the aluminum square tube, allows the support plate 11 to tightly press against the inner wall of the aluminum square tube, generating greater friction and achieving a more robust and stable connection. Furthermore, by placing rubber pads 2 at the ends of the aluminum square tube and trimming and surface-treating the protruding pads after connection and fixing, the connection gaps can be effectively concealed, achieving a concealed seam decorative effect and greatly improving the overall visual quality of the aluminum square tube ceiling. This internal expansion fixing method means that the connection strength does not depend on the snap-fit ​​structure precision of the aluminum square tube profile itself, resulting in better adaptability and reliability.

[0028] When installing the plug-in concealed seam connection structure for the aluminum square tube decorative surface of this utility model, firstly, insert the entire connection structure into one end of the first aluminum square tube 1 until the rubber pad 2 abuts against the end of the first aluminum square tube 1. Next, fit the second aluminum square tube 3 onto the connection structure, ensuring that its end also abuts against the rubber pad 2. At this point, the connection structure is located inside the two aluminum square tubes, and the rubber pad 2 is located at the joint gap between the two aluminum square tubes. Subsequently, by operating the expansion drive mechanism, the two support plates 11 are driven to move in a direction away from each other. For example, if the expansion drive mechanism uses threaded transmission, rotating the internal rotating sleeve 5 can drive the left-hand threaded rod 8 and the right-hand threaded rod 9 to rotate. The threaded sleeve 10, which is threadedly connected to the threaded rods 8 and 9, will therefore move linearly outward, thereby pushing the support plate 11, which is fixedly connected to the threaded sleeve 10, to expand outward. The outer surface of the support plate 11 presses against the inner wall of the first aluminum square tube 1 and the second aluminum square tube 3, generating sufficient friction to firmly fix the connection structure inside the two aluminum square tubes and drive the two aluminum square tubes to be tightly connected. To facilitate operation of the internal rotating sleeve 5 when the opening at the top of the aluminum square tube is small, an external drive mechanism can be provided. For example, a toothed belt 6 can be connected via a wrought iron wire 4, with the toothed belt 6 meshing with a gear 7 fixed on the rotating sleeve 5. The user can pull the wrought iron wire 4 from the outside, causing the rotating sleeve 5 to rotate via the toothed belt 6 and the gear 7, thus expanding the support plate 11. After the support plate 11 is firmly fixed against the inner wall of the aluminum square tube, the external drive mechanism (such as the toothed belt 6 and the wrought iron wire 4) can be retracted. Finally, the rubber pad 2 that protrudes outward due to compression between the first aluminum square tube 1 and the second aluminum square tube 3 is flattened and sprayed according to the color of the aluminum square tube, ultimately making the joint almost invisible and achieving a concealed decorative effect. In this process, the rubber pad 2 serves to fill the gaps and provide a finishing surface; the arc plate 12 connects to and supports the support plate 11; the expansion drive mechanism converts the operating force into the expansion force of the support plate 11; the support plate 11 is fixed by friction with the inner wall of the aluminum square tube; the external drive mechanism (cast iron wire 4, toothed belt 6, gear 7) provides a convenient operating method.

[0029] Furthermore, this application also proposes that the arc-shaped plate is V-shaped and is integrally formed with the two support plates.

[0030] Specifically, in the above-described connection structure, the arc-shaped plate 12 is configured to be approximately V-shaped (see...). Figure 3 Furthermore, the curved plate 12 and the two support plates 11 connected to its two sides are designed as an integral structure. This means that the curved plate 12 and the two support plates 11 are formed as a single component through a single manufacturing process (e.g., bending, stamping, or casting), rather than through subsequent assembly or connection.

[0031] The V-shaped arc plate 12 and the two support plates 11, integrally formed, provide excellent structural stability and rigidity for the entire connection structure as a preferred embodiment. The V-shaped structure itself has strong resistance to bending and deformation. When integrally formed with the support plates 11, it effectively supports and connects the two support plates 11, ensuring their stable and synchronous outward movement under the action of the expansion drive mechanism. The integral forming manufacturing method simplifies the number of parts and the assembly process, improves production efficiency and product consistency, and also eliminates potential weaknesses at the connection points, enhancing the overall strength and reliability of the structure. Therefore, this V-shaped integrally formed arc plate 12 and support plate 11 structure, while achieving stable expansion of the support plates 11, also improves the durability of the connection structure itself.

[0032] Compared to connection structures that only include curved plates and support plates, this V-shaped curved plate, integrally formed with the two support plates, enhances the overall rigidity and stability of the connection structure through specific geometry and manufacturing processes. This V-shaped structure provides a more reliable support base for the expansion of the support plates, ensuring effective transmission of expansion forces and a tight fit between the support plates and the inner wall of the aluminum square tube, thereby further improving the strength of the connection. This additional technical feature, by optimizing the design of the basic components of the connection structure, makes a positive technical contribution to achieving stable insertion and fixation of the aluminum square tube.

[0033] Furthermore, this application also proposes that the curved plate and the two support plates are both made of stainless steel.

[0034] Specifically, in the aforementioned connection structure, the arc-shaped plate 12 and the two support plates 11 connected to its two sides are constructed of stainless steel. Stainless steel is a metallic material with excellent corrosion resistance, high strength, and good durability.

[0035] Using stainless steel as the material for the curved plate 12 and the support plate 11, as a preferred embodiment, significantly improves the service life and reliability of the connection structure in various environments. The corrosion resistance of stainless steel makes it less prone to rusting or erosion by environmental factors such as moisture and chemicals, making it particularly suitable for ceiling applications that may be exposed to environments with varying humidity or corrosive substances. Furthermore, the high strength and rigidity of stainless steel ensure that the support plate 11 does not easily deform when expanding and pressing against the inner wall of the aluminum square tube, thus providing stable and reliable support and fixation. This material selection enhances the overall performance and durability of the connection structure.

[0036] Compared to curved plates and support plates made of other possible materials (such as ordinary steel or certain plastics), the technical solution using stainless steel, through the superior properties of the material itself, enhances the stability and resistance to environmental corrosion of the connection structure during long-term use. This additional technical feature makes a significant contribution to ensuring the long-term robustness and structural integrity of aluminum square tube connections by optimizing the material selection of key load-bearing components.

[0037] Furthermore, this application also proposes that the expansion drive mechanism includes a threaded sleeve 10 disposed inside the support plate 11, a left-hand threaded rod 8 and a right-hand threaded rod 9 respectively threadedly connected to the two threaded sleeves 10, and a rotating sleeve 5 installed between the left-hand threaded rod 8 and the right-hand threaded rod 9.

[0038] Specifically, in the above connection structure, the expansion drive mechanism for driving the two support plates 11 to move outward is constructed based on the principle of threaded transmission (see...). Figure 3 The mechanism includes two threaded sleeves 10, which are disposed inside or fixedly connected to their respective support plates 11. A left-hand threaded rod 8 and a right-hand threaded rod 9 are threadedly connected to these two threaded sleeves 10, respectively. The left-hand threaded rod 8 and the right-hand threaded rod 9 are mounted on a rotating sleeve 5 between them, typically fixedly connected to both ends of the rotating sleeve 5 and coaxial with it.

[0039] The working principle of this expansion drive mechanism is as follows: when the rotating sleeve 5 is driven to rotate by an external driving force, the left-hand threaded rod 8 and the right-hand threaded rod 9, which are fixedly connected to it, also rotate synchronously. Since there is a threaded connection between the threaded sleeve 10 and the threaded rods 8 and 9, and the threaded sleeve 10 can only move linearly relative to the rotating sleeve 5 (constrained by the support plate 11), the rotation of the threaded rods is converted into linear motion of the threaded sleeve 10 through the action of the threaded pair. Because the left-hand threaded rod 8 and the right-hand threaded rod 9 use opposite thread directions (left-hand and right-hand), when they rotate in the same direction, the two threaded sleeves 10 connected to them will simultaneously move away from each other (i.e., towards the outside of their respective support plates 11), or simultaneously move towards each other, depending on the direction of rotation. Therefore, by controlling the rotation direction and angle of the rotating sleeve 5, the linear displacement of the two threaded sleeves 10 can be precisely controlled, thereby driving the two support plates 11 fixedly connected to the threaded sleeves 10 to expand outward or contract inward.

[0040] This expansion drive mechanism employs a threaded transmission, providing a reliable and controllable support plate expansion mechanism as a preferred embodiment. Compared to simple lever or wedge mechanisms, the threaded transmission offers self-locking (maintaining position even without driving force) and higher transmission accuracy, ensuring that the support plate 11 remains stably fixed after being pressed against the inner wall of the aluminum square tube, and is not easily loosened by vibration or other external forces. This additional technical feature provides crucial technical support for the stability and reliability of aluminum square tube connections by offering a specific and efficient expansion drive mechanism implementation scheme.

[0041] Furthermore, this application also proposes that there are two rotating sleeves 5, which are respectively connected to a left-hand threaded rod 8 and a right-hand threaded rod 9, and a gear 7 is installed between the two rotating sleeves 5.

[0042] Specifically, in the aforementioned expansion drive mechanism, the rotating sleeve 5 used to drive the left-hand threaded rod 8 and the right-hand threaded rod 9 to rotate is configured to have two (see...). Figure 3 These two rotating sleeves 5 are fixedly connected to a left-hand threaded rod 8 and a right-hand threaded rod 9, respectively. For example, the left rotating sleeve 5 is fixedly connected to one end of the left-hand threaded rod 8, and the right rotating sleeve 5 is fixedly connected to one end of the right-hand threaded rod 9. A gear 7 is mounted between these two rotating sleeves 5, typically located on the axis between them, and coaxial with both rotating sleeves 5. This gear 7 is designed to accept external rotational driving force.

[0043] This technical solution, as a preferred embodiment, provides a concrete structural implementation for transmitting external driving force to the threaded rods by setting two rotating sleeves 5 to connect two threaded rods 8 and 9 respectively, and installing a gear 7 between the two rotating sleeves 5. The gear 7, serving as the main power input interface, is positioned between the two rotating sleeves 5 to facilitate meshing and transmission with an external drive device (e.g., a toothed belt). The two rotating sleeves 5 are fixedly connected to their respective threaded rods, ensuring that the rotation of the gear 7 can be stably and synchronously transmitted to the left-hand threaded rod 8 and the right-hand threaded rod 9, thereby driving the threaded sleeve 10 to move linearly.

[0044] Compared to solutions that only mention a single rotating sleeve, this technical solution clearly defines the connection between the drive gear 7 and the two threaded rods 8 and 9. Specifically, it uses two rotating sleeves 5, each connected to a threaded rod, with the gear 7 positioned between them. This structural layout clearly defines the power transmission path, allowing external driving force to effectively drive the two threaded rods 8 and 9 to rotate synchronously via the gear 7 and rotating sleeves 5, providing a reliable power source for the subsequent expansion of the support plate 11. This additional technical feature, by refining the composition and connection relationships of the expansion drive mechanism, further contributes to the technical solution of achieving externally driven internal expansion.

[0045] Furthermore, this application also proposes that the expansion drive mechanism further includes a toothed belt 6, the teeth of which are adapted to the gear 7.

[0046] Specifically, in the aforementioned expansion drive mechanism, to facilitate the rotation of the internal gear 7 from the outside, the expansion drive mechanism further includes a toothed belt 6 (see...). Figure 4 and Figure 5 The toothed belt 6 is a flexible transmission belt with a toothed structure, the tooth blocks of which are designed to precisely mesh with the teeth of the gear 7. The toothed belt 6 is typically wrapped around the gear 7 and transmits rotational power through the meshing between its tooth blocks and the teeth of the gear 7.

[0047] The toothed belt 6 and gear 7, as a preferred embodiment, provide an efficient and reliable mechanism for externally driving the internal rotating sleeve 5. Since the opening at the top of the aluminum square tube is typically small, making it difficult to directly reach into the rotating sleeve or gears, the toothed belt 6 extends the operating point to the outside of the aluminum square tube. The user can externally pull or drive the toothed belt 6, and through the precise meshing of the toothed belt 6 and gear 7, the gear 7 and the connected rotating sleeve 5 are stably driven to rotate. This transmission method has advantages such as a constant transmission ratio, no slippage, and a compact structure, ensuring that external operation can be accurately converted into the action of the internal expansion drive mechanism.

[0048] Compared to other possible external drive methods (e.g., directly actuating gears via a thin rod or using friction transmission), the technical solution of using a toothed belt 6 meshing with gear 7 avoids slippage through forward meshing transmission, ensuring the reliability and accuracy of power transmission. This additional technical feature, by introducing a specific and efficient implementation of an external drive internal mechanism, greatly improves the convenience of installation and the reliability of the drive, making a significant technical contribution to achieving convenient installation and stable fixation of aluminum square tubes.

[0049] Furthermore, this application also proposes that one end of the toothed belt 6 is connected to a wrought iron wire 4.

[0050] Specifically, in the aforementioned external drive mechanism, to facilitate user operation of the toothed belt 6 from outside the aluminum square tube, one end of the toothed belt 6 is connected to a wrought iron wire 4 (see...). Figure 1 , Figure 4 and Figure 5 The wrought iron wire 4 is a metal wire that is both flexible and strong enough. One end of it is firmly fixed to the toothed belt 6, while the other end can extend to the outside of the aluminum square tube for easy gripping and pulling by the user.

[0051] The connection between the wrought iron wire 4 and the toothed belt 6, as a preferred embodiment, provides a simple and effective external operating interface. Since aluminum square tubes are typically installed at a high position and have limited internal space, directly operating the toothed belt 6 may be inconvenient. By connecting the wrought iron wire 4, the user can pull the wire 4 from an easily accessible location, such as below or to the side of the aluminum square tube, thereby moving the toothed belt 6 and driving the internal expansion drive mechanism. The flexibility of the wrought iron wire 4 allows it to easily pass through the opening of the aluminum square tube and be bent (see...). Figure 4 To accommodate different installation angles and space constraints.

[0052] Compared to solutions without external operating interfaces or employing other complex external drive devices, the technical solution of connecting the toothed belt 6 with wrought iron wire 4 provides a low-cost and easy-to-operate external drive method. This additional technical feature greatly improves the convenience and operability of the installation process, allowing users to complete the fixing operation of the connection structure without special tools or deep penetration into the aluminum square tube, making a significant technical contribution to improving the user experience and installation efficiency of the product.

[0053] Furthermore, this application also proposes that the outer side of the support plate 11 is provided with a concave rubber pad 2, which is located at the joint between the first aluminum square tube 1 and the second aluminum square tube 3.

[0054] Specifically, in the above-mentioned connection structure, a rubber pad 2 is provided on the outer surface of the support plate 11, that is, the side that contacts the inner wall of the aluminum square tube (see...). Figure 1 and Figure 2 The rubber pad 2 is constructed in a generally concave shape, and during installation, the rubber pad 2 is positioned at the butt joint of the first aluminum square tube 1 and the second aluminum square tube 3.

[0055] The rubber pad 2 is a material with elasticity and compressibility, such as rubber or an elastomer. Its concave structure can provide a certain volume when not under pressure, and deforms under the pressure of the expansion of the support plate 11 and the compression of the aluminum square tube ends, filling the tiny gaps at the joint. Placing it at the joint of the first aluminum square tube 1 and the second aluminum square tube 3 utilizes its filling and cushioning properties to prepare for subsequent joint treatment.

[0056] The technical solution of setting a concave rubber pad 2 on the outside of the support plate 11 and positioning it at the joint of the aluminum square tubes, as a preferred embodiment, is key to achieving a concealed seam effect at the aluminum square tube connection. Compared with the solution without a rubber pad, the rubber pad 2 can effectively fill the tiny gaps between the two aluminum square tubes, avoiding visible gaps that may occur from direct butt joints. After the connection is fixed, the outwardly protruding rubber pad 2 can be easily flattened and sprayed with a color matching the surface of the aluminum square tubes, making the joint almost invisible and greatly improving the overall aesthetics of the aluminum square tube ceiling. This additional technical feature, by setting an adjustable filler at the joint, makes an important technical contribution to solving the problem of obvious seams at the joints of aluminum square tubes in the prior art.

[0057] Furthermore, this application also proposes that the inner wall of the support plate 11 is equipped with a reinforcing rib 13, and the threaded sleeve 10 is installed on the reinforcing rib 13.

[0058] Specifically, in the above-described connection structure, in order to enhance the structural strength and rigidity of the support plate 11, a reinforcing rib 13 is installed on the inner wall of the support plate 11, i.e., on the side facing the expansion drive mechanism (see...). Figure 3 , Figure 4 and Figure 5 The reinforcing rib 13 is a structural element attached to or integrated into the inner wall of the support plate 11 to resist bending or deformation that may occur when the support plate 11 is subjected to expansion force. At the same time, the threaded sleeve 10 in the expansion drive mechanism is configured to be installed on the reinforcing rib 13, rather than directly installed on the weak part of the support plate 11.

[0059] The reinforcing rib 13 can take various forms, such as strips, grids, or X-shapes, and its main function is to improve the overall deformation resistance of the support plate 11. As a preferred embodiment, installing the threaded sleeve 10 on the reinforcing rib 13 ensures that the thrust generated by the expansion drive mechanism can be evenly transmitted to the support plate 11 through the stronger reinforcing rib 13, avoiding stress concentration. This allows the support plate 11 to expand outward more effectively and evenly, and stably abut against the inner wall of the aluminum square tube. This structural design enhances the load-bearing capacity and stability of the support plate 11, especially when a larger expansion force is required for secure fixation.

[0060] Compared to designs that directly install the support plate without reinforcing ribs or threaded sleeves, this technical solution, which installs reinforcing ribs 13 on the inner wall of the support plate 11 and mounts the threaded sleeves 10 on the reinforcing ribs 13, significantly improves the rigidity and strength of the support plate by optimizing its structural design and force transmission path. This additional technical feature ensures that the support plate 11 is less prone to local deformation during expansion, and can more effectively transmit the expansion force to the inner wall of the aluminum square tube, increasing the contact area and friction, thereby further enhancing the stability and reliability of the connection and making a significant technical contribution to achieving a secure fixation of the aluminum square tube.

[0061] Furthermore, this application also proposes that the reinforcing rib 13 is designed in an X shape, with its four ends extending to the four corners of the inner sidewall of the support plate 11.

[0062] Specifically, in the above-mentioned connection structure, the reinforcing ribs 13 provided on the inner wall of the support plate 11 are configured in an X-shape (see...). Figure 3 , Figure 4 and Figure 5 The four ends of the X-shaped reinforcing rib 13 are designed to extend to the four corner areas of the inner sidewall of the support plate 11, respectively.

[0063] The X-shaped design of the reinforcing rib 13, with its ends extending to the four corners of the inner wall of the support plate 11, provides a highly efficient and optimized reinforcement scheme for the support plate structure as a preferred embodiment. The X-shaped structure itself possesses excellent mechanical properties, effectively dispersing and transferring stress, and resisting bending and torsional deformation from different directions. Arranging the four ends of the X-shape at the four corners of the inner wall of the support plate 11 allows the reinforcing rib 13 to cover the inner surface of the support plate 11 to the maximum extent, providing additional stiffness in the edges and corners where support is most needed. When the threaded sleeve 10 (typically installed in the central area of ​​the reinforcing rib 13) applies an expansion thrust, the X-shaped reinforcing rib 13 effectively and evenly distributes this force across the entire surface of the support plate 11, resisting the tendency of the support plate 11 to bend inward or deform locally, ensuring that the support plate 11 remains flat and moves stably outward.

[0064] Compared to simply using ordinary reinforcing ribs, the X-shaped design of the reinforcing rib 13, extending to the four corners of the inner wall of the support plate 11, provides a superior structural reinforcement effect through its specific geometry and layout. This additional technical feature significantly improves the overall stiffness and deformation resistance of the support plate 11, ensuring that the force generated by the expansion drive mechanism can be efficiently and evenly converted into the clamping force of the support plate 11 against the inner wall of the aluminum square tube. This further enhances the strength and stability of the connection, making a significant technical contribution to improving the performance of the entire connection structure.

[0065] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A plug-type blind stitch connection structure of an aluminum extrusion decorative surface, comprising: The first aluminum square tube (1), the second aluminum square tube (3), and the connecting structure for connecting the first aluminum square tube (1) and the second aluminum square tube (3) are characterized in that the connecting structure includes an arc plate (12) and support plates (11) connected to both sides of the arc plate (12). An expansion drive mechanism is provided between the two support plates (11) for driving the two support plates (11) to move outward and abut against the inner wall of the first aluminum square tube (1) and the second aluminum square tube (3).

2. The plug-type blind joint structure of an aluminum square tube decorative surface according to claim 1, characterized in that, The arc-shaped plate (12) is V-shaped and is integrally formed with the two support plates (11).

3. The plug-type blind joint structure of an aluminum square tube decorative surface according to claim 2, characterized in that, The arc plate (12) and the two support plates (11) are both made of stainless steel.

4. The plug-type blind joint structure of an aluminum square tube decorative surface according to claim 3, characterized in that, The expansion drive mechanism includes a threaded sleeve (10) disposed inside the support plate (11), a left-hand threaded rod (8) and a right-hand threaded rod (9) respectively threadedly connected to the two threaded sleeves (10), and a rotating sleeve (5) installed between the left-hand threaded rod (8) and the right-hand threaded rod (9).

5. The plug-type blind joint structure of an aluminum square tube decorative surface according to claim 4, characterized in that, Two rotating sleeves (5) are provided, and the two rotating sleeves (5) are respectively connected to a left-hand threaded rod (8) and a right-hand threaded rod (9), and a gear (7) is installed between the two rotating sleeves (5).

6. The plug-type blind joint structure of an aluminum square tube decorative surface according to claim 5, characterized in that, The expansion drive mechanism also includes a toothed belt (6), the teeth of which are adapted to the gears (7).

7. The plug-type blind joint structure of an aluminum square tube decorative surface according to claim 6, characterized in that, One end of the toothed belt (6) is connected to a wrought iron wire (4).

8. The plug-type blind joint structure of an aluminum square tube decorative surface according to claim 7, characterized in that, The outer side of the support plate (11) is provided with a concave rubber pad (2), which is located at the joint of the first aluminum square tube (1) and the second aluminum square tube (3).

9. The plug-type blind joint structure of an aluminum square tube decorative surface according to claim 8, characterized in that, The inner wall of the support plate (11) is equipped with reinforcing ribs (13), and the threaded sleeve (10) is installed on the reinforcing ribs (13).

10. The plug-in concealed seam connection structure for the aluminum square tube decorative surface according to claim 9, characterized in that, The reinforcing rib (13) is designed in an X shape, and the four ends of the reinforcing rib (13) extend to the four corners of the inner sidewall of the support plate (11).

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