Steel profile frame and connection structure

Abstract

The invention discloses a steel profile frame and a connecting structure, and relates to the technical field of door and window processing, the steel profile frame comprises a window frame main body formed by connecting a plurality of pairs of profiles at corners through the connecting structure, a main cavity is formed in each profile in the length direction in a penetrating manner, and a pair of fastening bolts is mounted on the outer side of each profile; a pair of anti-falling pieces are embedded in the inner side of the sectional material and correspond to the fastening bolts in position, each anti-falling piece comprises a sealing cover plate, the sectional material is provided with an installation groove matched with the sealing cover plate, anti-falling non-return teeth are symmetrically installed on the face, located in the main cavity, of the sealing cover plate, and the anti-falling non-return teeth are matched with the installation groove. The inner wall of the main cavity is provided with a guide groove connected with the profile opening and the mounting groove. According to the connecting structure, the L-shaped connecting plate is matched with the profile main cavity in an inserted mode, the anti-disengaging non-return teeth are elastically clamped with the mounting non-return assembly, the connecting plate is promoted to expand through the expansion gap when the fastening bolt is screwed in, then the abutting piece is extruded to lock the mounting non-return assembly, and self-fastening of the connecting structure is achieved.

Description

Technical Field

[0001] This invention relates to the field of door and window processing technology, specifically to a steel profile frame and its connecting structure. Background Technology

[0002] Steel frame structures are widely used in building doors and windows, curtain walls, and prefabricated partition systems. The reliability of their connection nodes directly affects the stability, sealing, and service life of the overall structure. Traditional steel profile frames mostly use corner brackets or welding to splice the profiles, with corner bracket connections relying on bolt fastening or snap-fit ​​structures for fixation.

[0003] The existing patent application, with publication number CN119686612A and publication date of March 25, 2025, is titled "A Splicing Window Frame Connection Device and Method of Use." This patent includes connecting components for connecting adjacent frame edges and multiple fixing components. The connecting components include a first splicing assembly and a second splicing assembly connected to the first splicing assembly. The first and second splicing assemblies are respectively connected to the corresponding frame edges through a matching number of fixing components. This invention provides a method of using the splicing window frame connection device. The connecting end face of each frame edge is cut into a suitable bevel. The first and second splicing assemblies are respectively inserted into the corresponding frame edges, ensuring a tight fit between adjacent frame edges. Fixing components are then installed for fixation. The advantages of this invention are that the four corners of the window frame are tightly and straightly connected, and the connecting components can be rotated for installation at various corners of the window frame. The structure is simple, the processing cost is low, and the installation quality of the window frame can be improved.

[0004] The aforementioned applications have shortcomings. When fixing the connection, bolts are usually used, which rely on the direct thread engagement between the bolts and the inner wall of the profile. During long-term use, the preload is prone to decrease due to vibration, temperature changes, or profile deformation, resulting in loosening of the connection and affecting the stability and sealing of the frame. Secondly, most connection structures lack effective anti-loosening mechanisms and rely solely on the friction of the bolts to maintain the connection, which poses a safety hazard. In addition, to improve the sealing performance, additional sealing strips or gaskets are usually required, but these accessories are prone to displacement or aging during installation, resulting in a short-lasting sealing effect. Furthermore, existing connection methods often require multiple steps during installation, such as positioning before tightening and installing additional anti-loosening components. Summary of the Invention

[0005] The purpose of this invention is to provide a steel profile frame and connection structure to overcome the shortcomings of the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A steel profile frame includes a window frame body formed by connecting multiple pairs of profiles at the corners through a connecting structure. A main cavity is formed through the interior of each profile along its length. A pair of fastening bolts are installed on the outer side of each profile. A pair of anti-detachment components are embedded on the inner side of each profile, corresponding to the positions of the fastening bolts. Each anti-detachment component includes a sealing cover plate. An installation groove adapted to the sealing cover plate is formed on the profile. Anti-detachment check teeth are symmetrically installed on the side of the sealing cover plate located in the main cavity. A guide groove connecting the profile opening and the installation groove is formed on the inner wall of the main cavity. A rubber pad is fixedly connected to one side of the inner wall of the guide groove.

[0008] Preferably, each pair of profiles is provided with vertically distributed thermal insulation strips, and each pair of profiles has multiple sets of reinforcing ribs fixedly connected to the opposite side, with the reinforcing ribs vertically located between the two thermal insulation strips.

[0009] Preferably, sound-absorbing cotton is provided between the two heat insulation strips, and a sealing strip is installed on the pair of profiles above the sound-absorbing cotton.

[0010] A connection structure for the aforementioned steel profile frame includes L-shaped connecting plates that are respectively inserted into the main cavities of adjacent profiles, and a pair of screw holes symmetrically opened on the outer sides of both ends of the L-shaped connecting plates to match fastening bolts. An expansion joint connected to the screw holes is also opened on the outer edge of the L-shaped connecting plate. Two sets of installation check components are provided, each set of installation check components being elastically installed on both sides of the L-shaped connecting plate, and each set of installation check components is engaged with an anti-disengagement component. An abutment component is movably embedded inside the screw holes. The installation check components and the abutment component abut against each other. When the fastening bolts are screwed into the screw holes, the L-shaped connecting plate expands through the expansion joints and squeezes the abutment component to restrict the movement of the installation check components.

[0011] Preferably, the installation check assembly includes an abutting check rack that is slidably connected to an L-shaped connecting plate. A pair of sliders are fixedly connected to one side of the abutting check rack. The L-shaped connecting plate has a groove that matches the sliders. A top spring that abuts against the inner wall of the groove is fixedly connected to one side of the slider. The abutting check rack and the anti-disengagement check teeth mesh with each other.

[0012] Preferably, the abutting member includes a washer ring disposed in the screw hole, a pair of snap-fit ​​brackets are fixedly connected to the outer wall of the washer ring, and an elastic plug-in member for inserting into the snap-fit ​​brackets is fixedly connected to one side of the abutting check rack.

[0013] Preferably, a pair of push rods are fixedly connected to the outer wall of the gasket ring, the snap-fit ​​bracket and the push rods are staggered, the expansion joint is provided with a shrinkage groove for the push rods to be inserted, the push rods and the inner wall of the shrinkage groove are inclined to abut against each other, and the shrinkage groove gradually shrinks along the insertion direction of the push rods.

[0014] Preferably, when the abutting check rack is inserted into the guide groove of the profile, one side of the abutting check rack contacts the inner wall of the guide groove, and when the fastening bolt is screwed into the screw hole, the other side of the abutting check rack abuts against the rubber pad.

[0015] Preferably, the elastic connector includes a connecting rod fixed to the abutting check rack, the connecting rod having an insert rod that contacts the snap-fit ​​bracket, and the connecting rod having a limiting protrusion fixedly connected to the end of the insert rod.

[0016] Preferably, a wedge-shaped top block is fixedly connected to one side of the insertion rod, and a wedge-shaped braking block that is in inclined contact with the wedge-shaped top block is fixedly connected to the inner wall of the snap-fit ​​bracket.

[0017] In the above technical solution, the L-shaped connecting plate is inserted into the main cavity of the profile, combined with the elastic engagement of the anti-loosening check teeth and the installation check component. When the fastening bolts are tightened, the expansion joint causes the connecting plate to expand, thereby squeezing the abutment to lock the installation check component. This achieves self-tightening, anti-loosening, and enhanced sealing of the connection structure. The anti-loosening check teeth in the anti-loosening component and the installation check component on the L-shaped connecting plate form a one-way engagement, preventing the L-shaped connecting plate from shifting backward after being inserted into the profile. After the bolts are tightened, the abutment is squeezed, thus restricting the movement of the installation check component, forming a mechanical interlock. This achieves double insurance of mechanical snap-fit ​​and bolt tightening, effectively resisting the effects of vibration and deformation. The guide groove set in the main cavity of the profile corresponds to the insertion path of the L-shaped connecting plate, and the rubber pad provides buffer positioning, reducing the difficulty of installation alignment. The anti-loosening component is pre-embedded in the inner side of the profile through the installation groove, simplifying the on-site assembly steps and improving construction efficiency.

[0018] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit this disclosure.

[0019] This application provides an overview of various implementations or examples of the technology described in this disclosure, and is not a full disclosure of the entire scope or all features of the disclosed technology. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0021] Figure 1 This is a schematic diagram of the overall structure of a steel profile frame and its connecting structure according to the present invention;

[0022] Figure 2This is a schematic diagram of the connection structure of a steel profile frame according to the present invention;

[0023] Figure 3 This is a structural schematic diagram of a steel profile frame according to the present invention;

[0024] Figure 4 This is a schematic diagram of the overall structure of a connecting structure according to the present invention;

[0025] Figure 5 This is a schematic diagram of the L-shaped connecting plate in a connecting structure according to the present invention;

[0026] Figure 6 This is a schematic diagram of the abutment member and the mounting check assembly in a connecting structure according to the present invention;

[0027] Figure 7 This is a schematic diagram of a connection structure in which a check valve assembly and an elastic connector are installed;

[0028] Figure 8 This is a schematic diagram of the abutment member in a connecting structure according to the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Profile; 101. Main cavity; 102. Mounting groove; 103. Guide groove; 104. Rubber gasket; 105. Thermal insulation strip; 106. Reinforcing rib; 107. Sound-absorbing cotton; 108. Sealing strip; 2. Fastening bolts; 3. Anti-loosening components; 301. Sealing cover plate; 302. Anti-loosening check tooth; 4. L-shaped connecting plate; 401. Screw hole; 402. Expansion joint; 403. Slide groove 404. Shrinkage groove; 5. Install check valve assembly; 501. Abutting check valve rack; 502. Slider; 503. Top spring; 6. Abutting part; 601. Washer ring; 602. Snap-fit ​​bracket; 603. Push rod; 604. Wedge brake block; 7. Elastic plug-in part; 701. Connecting rod; 702. Insert rod; 703. Limiting protrusion; 704. Wedge top block; 705. Connecting spring. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0032] Please see Figures 1-8The invention provides a steel profile frame, including a window frame body formed by connecting multiple pairs of profiles 1 at the corners through a connecting structure. A main cavity 101 is formed through the profile 1 along its length. A pair of fastening bolts 2 are installed on the outside of the profile 1. A pair of anti-detachment parts 3 are embedded on the inside of the profile 1, corresponding to the positions of the fastening bolts 2. The anti-detachment parts 3 include a sealing cover plate 301. An installation groove 102 adapted to the sealing cover plate 301 is formed on the profile 1. Anti-detachment check teeth 302 are symmetrically installed on one side of the sealing cover plate 301 located in the main cavity 101. A guide groove 103 connecting the opening of the profile 1 and the installation groove 102 is formed on the inner wall of the main cavity 101. A rubber pad strip 104 is fixedly connected to one side of the inner wall of the guide groove 103.

[0033] Specifically, a pair of fastening bolts 2 are installed on the outer wall of each profile 1. These two bolts are located near the corners. The anti-detachment component 3 is pre-installed and fixed on the inner side of the profile 1. Each pair of profiles 1 is combined to form one side of the frame. After each pair of profiles 1 is connected by multiple connecting structures, they are assembled to form a window frame. When the window sash is closed, the anti-detachment component 3 is hidden by the window sash. The inner wall of the profile 1 has an installation groove 102 that matches the shape and size of the sealing cover plate 301, so that the anti-detachment component 3 can be smoothly embedded in it without protruding from the surface of the profile 1. The anti-detachment check tooth 302 has a one-way locking characteristic, which can prevent the connecting structure from loosening after insertion. A guide groove 103 is provided on the inner wall of the main cavity 101. The guide groove 103 extends inward from the end opening of the profile 1 and communicates with the inner installation groove 102. Its function is to guide the connecting structure to be accurately and smoothly inserted into the predetermined position. A rubber pad 104 is fixedly bonded to one side of the inner wall of the guide groove 103. This pad not only serves a sealing function but also generates frictional resistance when compressed. When installing the corner of the frame, the L-shaped connecting plate 4, which serves as the connecting structure, is first inserted into the main cavity 101 of the two profiles 1 to be connected from its right-angle end. The L-shaped connecting plate 4 slides along the guide groove 103, which ensures that the connecting plate is precisely guided to the designed depth. During this process, the connecting plate will initially compress the rubber pad 104, generating a certain amount of friction and a preliminary sealing effect. As the L-shaped connecting plate 4 continues to be inserted inward, its body will pass the position of the anti-loosening part 3. The inclined design of the anti-loosening check tooth 302 allows the connecting plate to slide in relatively easily, but its other side is designed to engage with the corresponding structure on the L-shaped connecting plate 4, forming a one-way engagement or bite, avoiding the assembly process. The connecting structure detaches from the profile 1, achieving the first layer of mechanical anti-detachment. Even if the fastening bolt 2 is not tightened, it can effectively prevent the profile 1 and the connecting plate from easily separating due to external force, playing a role in initial positioning and safety. Then, the fastening bolt 2 is aligned with the pre-drilled screw hole 401 and screwed in. As the bolt is continuously screwed in, the huge axial force generated by it acts on the screw hole 401. Since the screw hole 401 has an expansion joint 402 designed on the outside, this force will cause the end of the L-shaped connecting plate 4 to expand outward. The expanded L-shaped connecting plate 4 presses more tightly against the inner wall of the main cavity 101, and can also enhance the friction through the rubber pad 104, so that the profile 1 and the connector are combined into a rigid whole, significantly improving the stability of the connection point and the overall rigidity of the frame.

[0034] Compared with the prior art, the embodiments of the present invention have an anti-detachment component 3 embedded in the inner side of the profile 1. The symmetrically installed anti-detachment check teeth 302 extend into the main cavity 101. When the connecting structure is inserted, these check teeth can form a one-way snap or bite with the structure on the connecting plate, effectively preventing the profile 1 and the connecting plate from separating when subjected to vibration or impact. This provides a second mechanical safety for the corner connection in addition to bolt fastening, greatly improving the overall rigidity and stability of the frame. The rubber pad 104 in the guide groove 103 on the inner wall of the main cavity 101 can provide elastic compression when it cooperates with the L-shaped connecting plate 4 or other components, forming a sealing barrier. It also provides lateral friction after the L-shaped connecting plate 4 is opened, effectively blocking the intrusion of moisture, air and dust, and improving the overall structural stability of the frame. The anti-detachment component 3 and the sealing structure are both embedded in the cavity of the profile 1, completely hidden inside the cavity, without damaging the flatness and aesthetics of the profile 1's exterior.

[0035] In a further embodiment of the present invention, thermal insulation strips 105 distributed vertically are installed between each pair of profiles 1. Multiple sets of reinforcing ribs 106 are fixedly connected to the opposite side of each pair of profiles 1. The reinforcing ribs 106 are vertically positioned between the two thermal insulation strips 105. Specifically, the two ends of the thermal insulation strips 105 are mechanically engaged and fixed by a pre-set slot structure on the profiles 1, thereby connecting the two independent profiles 1 into a whole and forming an effective thermal break. The two ends of the reinforcing ribs 106 extend to positions close to the upper and lower thermal insulation strips 105, but remain unconnected to them to avoid... To prevent the formation of thermal bridges, the two thermal insulation strips 105 distributed vertically completely block the thermal bridge path that may be formed by the direct connection between the indoor and outdoor metal profiles 1. Since the thermal conductivity of the thermal insulation strip 105 is much lower than that of the metal profile 1, it can greatly slow down the conduction speed of heat through the window frame from the high temperature side to the low temperature side, thereby effectively reducing the heat transfer coefficient of the entire window and improving the energy-saving and heat-insulating effect of the building. The reinforcing ribs 106 effectively limit the local buckling deformation of the profile 1 wall panel under pressure, preventing it from denting inward or bulging outward, and ensuring the flatness and durability of the frame structure.

[0036] In a further embodiment of the present invention, a sound-absorbing cotton 107 is provided between the two thermal insulation strips 105, and a sealing strip 108 is installed above the sound-absorbing cotton 107 on a pair of profiles 1. Specifically, the sound-absorbing cotton 107 is filled in the thermal insulation cavity formed by the upper and lower thermal insulation strips 105 and the inner and outer walls of the profile 1. The size of the sound-absorbing cotton 107 matches the cross-section of the cavity. It is filled in by slight compression to ensure full contact with the surrounding profile 1 walls and thermal insulation strips 105. When the window frame and window sash are closed, the sealing strip 108 will be continuously compressed due to its elasticity, forming a soft and reliable sealing barrier. This barrier can effectively prevent air infiltration and rainwater intrusion, giving the steel profile 1 frame excellent sound insulation and airtight performance, making its comprehensive performance more comprehensive, and able to meet the requirements of modern buildings with higher requirements for sound environment quality, energy saving and comfort.

[0037] A connection structure for the frame of the aforementioned steel profile 1 includes an L-shaped connecting plate 4 that is inserted into the main cavity 101 of the adjacent profile 1, and a pair of screw holes 401 symmetrically opened on the outer sides of both ends of the L-shaped connecting plate 4 to match the fastening bolts 2. An expansion joint 402 connected to the screw holes 401 is also opened on the outer edge of the L-shaped connecting plate 4. Two sets of installation check components 5 are installed elastically on both sides of the L-shaped connecting plate 4, and each set of installation check components 5 is engaged with the anti-disengagement component 3. The abutment component 6 is movably embedded in the screw hole 401. The installation check component 5 and the abutment component 6 abut against each other. When the fastening bolt 2 is screwed into the screw hole 401, the L-shaped connecting plate 4 expands through the expansion joint 402 and squeezes the abutment component 6 to restrict the movement of the installation check component 5.

[0038] Specifically, the two mutually perpendicular extension arms of the L-shaped connecting plate 4 are respectively inserted into the main cavity 101 at the ends of two adjacent profiles 1. A screw hole 401 is symmetrically provided on the outer side of each arm of the L-shaped connecting plate 4, i.e., on the side facing the fastening bolt 2 after the profile 1 is inserted. This screw hole 401 is used to screw in the fastening bolt 2 from the outside of the profile 1. A thin expansion joint 402 connects to the screw hole 401 along the outer side of the L-shaped connecting plate 4, allowing the L-shaped connecting plate 4 to open outwards when the bolt is tightened. Two sets of installation check valve components 5 are located on the two extension arms of the L-shaped connecting plate 4. Each set of installation check valve components 5 is installed in a preset groove on both sides of the L-shaped connecting plate 4 through its own elastic structure, ensuring that it can elastically expand and contract within a certain range. During the insertion of the L-shaped connecting plate 4 into the profile 1, this component can form a one-way snap-fit ​​engagement with the anti-detachment check teeth 302 on the anti-detachment component 3 inside the profile 1. During installation, the two arms of the L-shaped connecting plate 4 are inserted along the main cavity 101 of the profile 1. The guide groove 103 on the inner wall of the main cavity 101 can limit the L-shaped connecting plate 4 when it is not open. At the same time, the rubber pad 104 provides frictional resistance and initial sealing during the insertion process. When the L-shaped connecting plate 4 is inserted to the predetermined depth, the installation check components 5 on both sides will meet the anti-detachment check teeth 302 embedded in the anti-detachment component 3 inside the profile 1. The inclined design of the anti-detachment check teeth 302 allows the installation check components 5 to be squeezed and slid over during insertion. Once slid over, the installation check components 5 will quickly retract under their own elasticity. The rapid rebound, with its hook portion forming a reverse engagement with the anti-loosening check tooth 302, achieves the first layer of mechanical anti-loosening. At this point, even without tightening the bolts, the profile 1 and the connecting plate have formed a one-way lock, making them difficult to pull out. This completes the initial positioning and connection, greatly facilitating subsequent installation. After the initial engagement is completed, the fastening bolt 2 is aligned with the screw hole 401 from the outside of the profile 1 and screwed in. As the bolt goes deeper, its end presses against the abutment 6, which is movable and embedded in the screw hole 401, and pushes it inward. The moving abutment 6 then squeezes the installation check component 5 that it abuts, applying a force in the engagement direction, thereby eliminating all the movement of the component and firmly pressing it into the buckle of the anti-loosening check tooth 302, achieving the second layer of mechanical anti-loosening. Heavy machinery locks the bolt in place to prevent it from accidentally coming loose due to vibration. At the same time, the huge radial force generated by the continuous tightening of the bolt is transmitted to the wall of the bolt hole 401 through the abutment 6 and acts on the area with the expansion joint 402. This force forces the L-shaped connecting plate 4 to expand and deform outward. The outer wall of the expanded L-shaped connecting plate 4 will strongly press against the inner wall of the main cavity 101, so that the L-shaped connecting plate 4 and the profile 1 are tightly integrated, significantly enhancing the rigidity and deformation resistance of the connection point. The elastic deformation generated by the expansion provides a continuous and stable preload for the connection, which can effectively resist the decrease in bolt preload caused by vibration and temperature difference. This solves the problem of easy loosening of traditional connections and achieves the mutual cooperation of mechanical anti-loosening and expansion fastening, greatly improving the stability of the frame.

[0039] Compared with the prior art, the present invention achieves self-tightening, anti-detachment, and enhanced sealing of the connection structure by inserting the L-shaped connecting plate 4 into the main cavity 101 of the profile 1, combining the anti-detachment check tooth 302 with the elastic snap-fit ​​of the installation check component 5, and utilizing the expansion joint 402 to cause the connecting plate to expand when the fastening bolt 2 is screwed in, thereby squeezing the abutment member 6 to lock the installation check component 5. The anti-detachment check tooth 302 in the anti-detachment member 3 forms a one-way snap-fit ​​with the installation check component 5 on the L-shaped connecting plate 4, preventing the L-shaped connecting plate 4 from being inserted. The profile 1 is displaced in the reverse direction. After the bolts are tightened, the abutment 6 is squeezed, which restricts the movement of the installation check assembly 5, forming a mechanical interlock. This achieves double insurance of mechanical buckling and bolt tightening, effectively resisting the effects of vibration and deformation. The guide groove 103 set in the main cavity 101 of the profile 1 corresponds to the insertion path of the L-shaped connecting plate 4. The rubber pad 104 provides buffer positioning, reducing the difficulty of installation alignment. The anti-detachment component 3 is pre-embedded in the inner side of the profile 1 through the installation groove 102, which simplifies the on-site assembly steps and improves construction efficiency.

[0040] In a further embodiment of the present invention, the anti-return assembly 5 includes an abutting anti-return rack 501 slidably connected to an L-shaped connecting plate 4. A pair of sliders 502 are fixedly connected to one side of the abutting anti-return rack 501. A groove 403 matching the sliders 502 is provided on the L-shaped connecting plate 4. A top spring 503 abutting against the inner wall of the groove 403 is fixedly connected to one side of the sliders 502. The abutting anti-return rack 501 meshes with the anti-disengagement anti-return rack 302. Specifically, the sliders 502 are embedded in the groove 403, allowing the abutting anti-return rack 501 to slide smoothly relative to the L-shaped connecting plate 4 along the guide of the groove 403 for a certain stroke. The top spring... 503 provides an elastic preload force to the slider 502 and the entire abutment check rack 501, always pointing towards the anti-detachment component 3 inside the profile 1. When the L-shaped connecting plate 4 is inserted into the main cavity 101 of the profile 1, the inclined surface of the tooth end of the abutment check rack 501 will first contact the anti-detachment check tooth 302 of the anti-detachment component 3. Under the continuous insertion force, the interaction of the inclined surfaces will generate a component force that causes the abutment check rack 501 to overcome the pressure of the top spring 503 and slide along the slide groove 403 towards the outside of the L-shaped connecting plate 4. This process achieves smooth guidance and overcoming until the abutment check rack 501 is completely aligned with the anti-detachment check tooth 302. As the spring 503 passes through, the elastic potential energy stored in it is released instantaneously, pushing the anti-reverse rack 501 to slide, causing its teeth to firmly engage with the teeth of the anti-disengagement anti-reverse rack 302. At this time, due to the unidirectional design of the teeth, the L-shaped connecting plate 4 cannot be pulled out in the opposite direction, achieving the first reliable mechanical anti-backward locking and completing the initial positioning and fixing of the corner connection of the profile 1. When the fastening bolt 2 is screwed in from the outside, the bolt end pushes the abutment 6, which is movable and embedded in the bolt hole 401, to move inward. The moving abutment 6 directly presses against the back of the anti-reverse rack 501, which is already in the meshing state. This pressing action further ensures the tightness between the meshing teeth. The contact eliminates any gaps that may be caused by manufacturing tolerances or vibrations, achieving optimal engagement. At the same time, the mechanical intervention of the abutment member 6 forcibly restricts any backward movement of the abutment check rack 501 within the slide groove 403, preventing it from retracting and moving as it did during insertion. This transforms it from an "elastic and movable" state to a rigid and immovable locked state, completing the second layer of mechanical locking. Even if the top spring 503 fails under extreme conditions, the mechanical limiting effect of the abutment member 6 can absolutely guarantee that the engagement will not disengage, greatly enhancing the reliability of anti-disengagement. The reliable and stable mechanical interlocking improves the safety performance of the frame corner connection.

[0041] In a further embodiment of the present invention, the abutting member 6 includes a washer 601 disposed in the screw hole 401. A pair of snap-fit ​​brackets 602 are fixedly connected to the outer wall of the washer 601. An elastic plug-in member 7, which inserts into the snap-fit ​​bracket 602, is fixedly connected to one side of the abutting check rack 501. Specifically, the washer 601 is placed as an independent force-bearing member on the bolt's push path. A pair of snap-fit ​​brackets 602 are symmetrically fixedly connected to the outer wall of the washer 601. The snap-fit ​​brackets 602 are L-shaped supports, and their openings face the direction of the elastic plug-in member 7 mounted on the check rack 5. During the insertion of the L-shaped connecting plate 4 into the profile 1, the elastic connector 7 is already inserted into the snap-fit ​​bracket 602. At this time, the entire mechanism is in a free state. The elastic connector 7 exerts a slight outward pushing force on the washer 601, but this force is not enough to affect the bolt that has not been screwed in. The abutment check rack 501 engages with the anti-disengagement check tooth 302 under the action of the top spring 503, achieving the first layer of anti-disengagement locking. When the fastening bolt 2 is screwed in, the end of the bolt contacts the washer 601 and continuously pushes the washer 601 into the screw hole 401. The connecting bracket 602 pushes the elastic connector 7, forcibly pushing it against the check rack 501. This makes the engagement between the check rack 501 and the anti-disengagement check tooth 302 more tight, eliminating all gaps, and finally achieving mechanical rigid locking due to the exhaustion of the mechanism's stroke. During the pushing and compression process, the elastic connector 7 stores a huge elastic recovery potential energy. At the same time, the radial component of the bolt acts on the expansion joint 402, causing the L-shaped connecting plate 4 to expand and press against the inner wall of the profile 1, achieving automatic leveling and friction fastening. When the bolt is tightened to the correct position... When the operation stops, the compressed elastic connector 7 is converted into a counterforce that acts continuously on the snap-fit ​​bracket 602. This force is then transmitted through the washer 601 to the fastening bolt 2 that abuts against the washer 601. The direction of this force is opposite to the direction in which the bolt may loosen. Therefore, any minor vibration or deformation that may cause the bolt to loosen must first overcome this continuous anti-loosening force generated by the elastic connector 7, effectively preventing the fastening bolt 2 from accidentally loosening due to vibration and ensuring the long-term stability of the corner connection.

[0042] In a further embodiment of the present invention, a pair of push rods 603 are fixedly connected to the outer wall of the gasket 601. The snap-fit ​​bracket 602 and the push rods 603 are staggered. The expansion joint 402 is provided with a contraction groove 404 for the push rods 603 to be inserted. The push rods 603 and the inner wall of the contraction groove 404 are inclined and abut against each other. The contraction groove 404 gradually narrows along the insertion direction of the push rods 603. Specifically, the positions of the push rods 603 and the snap-fit ​​bracket 602 are staggered and distributed at intervals in the circumferential direction to ensure that their respective functions do not interfere with each other. The cross-section of the contraction groove 404 is along the insertion direction of the push rods 603, that is... As the bolt is tightened, the movement direction of the washer 601 gradually narrows, forming a tapered wedge structure. When the bolt is not tightened, the push rod 603 is positioned at the wider entrance end of the tapered contraction groove 404. At this time, it does not generate an expansion force on the connecting plate. The snap-fit ​​bracket 602 cooperates with the elastic plug 7 to perform the linkage locking function with the anti-loosening check teeth 302. Because it and the push rod 603 are staggered in layout, they work independently and do not interfere with each other. When the fastening bolt 2 is screwed into the washer 601, the rotational movement of the bolt is converted into a strong thrust on the washer 601, forcing the washer 601 and the push rod 603 together towards L. As the L-shaped connecting plate 4 moves internally, the push rod 603 penetrates deeper into the gradually narrowing contraction groove 404. Its end contacts the gradually narrowing inclined groove wall and generates compression. The thrust is decomposed into two components through the inclined surface. A large radial component acts directly on the inclined wall of the contraction groove 404. Since the contraction groove 404 is part of the expansion joint 402, this radial force effectively forces the L-shaped connecting plate 4 to elastically deform outward. Even as it expands, a smaller normal force is used to overcome friction. Compared with the traditional method that relies solely on the radial component of the bolt head cone or thread itself to cause expansion, this lever-type inclined... The face mechanism can generate a more significant and controllable expansion of the L-shaped connecting plate 4 with a smaller bolt tightening torque, thereby obtaining greater contact pressure and friction. The self-locking effect and stability maintenance, the tapered shrinkage groove 404 structure and the inclined surface of the push rod 603 cooperate, once the expansion force is formed, the internal friction will effectively resist the tendency of the L-shaped connecting plate 4 to try to retract due to the elasticity of the material, which helps to maintain the expansion state for a long time, further enhancing the stability of the connection and the ability to resist loosening, significantly improving the expansion effect and connection rigidity of the connecting plate, and also reducing the required bolt tightening torque, making installation easier.

[0043] In a further embodiment of the present invention, when the abutment check rack 501 is inserted into the guide groove 103 of the profile 1, one side of the abutment check rack 501 contacts the inner wall of the guide groove 103. When the fastening bolt 2 is screwed into the screw hole 401, the other side of the abutment check rack 501 abuts against the rubber pad 104. Specifically, when the L-shaped connecting plate 4 is inserted, the first side of the abutment check rack 501 is always in contact with or slides against the solid inner wall of the guide groove 103. This provides additional and more precise guidance for the entire installation check assembly 5, preventing it from deviating or getting stuck midway, and ensuring that it can accurately engage with the anti-disengagement check tooth 302. Before the bolt is tightened, this contact provides an initial radial support point for the connection point, slightly enhancing the bending stiffness of the L-shaped connecting plate 4. When the fastening bolt 2 is screwed in, as... The front L-shaped connecting plate 4 opens, and by pushing the abutment check rack 501, it locks it with the anti-detachment check tooth 302. At the same time, this powerful thrust has a direct component acting on the abutment check rack 501, driving the side of the abutment check rack 501 that originally had a gap with the rubber pad 104 to press against the soft rubber pad 104. The abutment check rack 501 acts like a huge pressure block, tightly squeezing the rubber pad 104 against the wall of the guide groove 103, forming an extremely reliable sealing barrier. At the same time, it greatly increases the friction force borne by the abutment check rack 501, tightly connecting the L-shaped connecting plate 4, the profile 1, and the built-in installation check assembly 5 into a whole, greatly enhancing the bending and torsional deformation resistance of the corner connection, and qualitatively improving the structural rigidity of the entire frame.

[0044] In a further embodiment of the present invention, the elastic connector 7 includes a connecting rod 701 fixed to the abutting check rack 501, one end of which is fixedly connected to the side of the abutting check rack 501. The connecting rod 701 has a hollow internal structure, forming a sliding cavity. An insert rod 702 that contacts the snap-fit ​​bracket 602 is elastically inserted inside the connecting rod 701. The insert rod 702 is inserted into the sliding cavity of the connecting rod 701. A connecting spring 705 is installed between the insert rod 702 and the connecting rod 701. The insert rod 702 can slide along the axial direction for a certain stroke. The outer end of the insert rod 702 is used to contact or connect with the snap-fit ​​bracket 602 of the abutting member 6. A limiting protrusion 703 that abuts against the end of the insert rod 702 is fixedly connected inside the connecting rod 701. Specifically, the limiting protrusion 703 is fixedly connected to the inner wall of the sliding cavity of the connecting rod 701, defining the limit stroke of the insertion rod 702 that can retract into the connecting rod 701. Under normal conditions, the preload spring pushes the insertion rod 702 outward to its maximum extension. At this time, the inner end of the insertion rod 702 maintains a certain distance from the limiting protrusion 703. The elastic thrust provided by the connecting spring 705 is in the opposite direction to the direction that pushes the washer 601 to move when the fastening bolt 2 is screwed into the screw hole 401. When the fastening bolt 2 is tightened, the washer 601 moves into the connecting plate under the thrust of the bolt, causing the snap-fit ​​bracket 602 to move synchronously. The snap-fit ​​bracket 602 first pushes the insertion rod 702, making it overcome the elastic force of the connecting spring 705 and move towards the connecting plate. During the sliding contraction of rod 701, the thrust of the bolt is mainly converted into the compressive potential energy of the preloaded spring. This elastic contraction process absorbs the initial impact on the mechanism, providing a buffering effect, making the operation smoother, and protecting the parts from rigid impacts. When the insert rod 702 retracts into the connecting rod 701 until its inner end abuts against the limiting protrusion 703, its elastic contraction stroke reaches its end. After this, the insert rod 702, the limiting protrusion 703, and the connecting rod 701 form an integral rigid structure. The thrust generated by the bolt is directly transmitted to the abutting check rack 501 without attenuation through the snap-fit ​​bracket 602, the now rigid insert rod 702, and the connecting rod 701. This powerful rigid thrust ultimately forces the abutting check rack 501 to... 01 achieves an extremely tight engagement with the anti-loosening check tooth 302, and the abutting check tooth 501 on the expanded L-shaped connecting plate 4 presses against the rubber pad 104, achieving gapless clamping and mechanical locking. After the bolt is tightened and the mechanism is locked, the connecting spring 705, which is compressed to the maximum extent, has a spring force direction opposite to the bolt tightening direction. Therefore, the restoring potential energy stored in the spring continuously acts on the snap-fit ​​bracket 602 and the washer 601 through the insert rod 702, generating a continuous pushing force in the direction of bolt withdrawal. This pushing force acts directly on the threaded pair of the fastening bolt 2, and is converted into an effective anti-loosening friction torque, continuously resisting the bolt loosening that may be caused by vibration, and ensuring the long-term reliability of the connection.

[0045] In a further embodiment of the present invention, a wedge-shaped top block 704 is fixedly connected to one side of the insertion rod 702, and a wedge-shaped braking block 604 that is inclinedly contacting the wedge-shaped top block 704 is fixedly connected to the inner wall of the snap-fit ​​bracket 602. Specifically, the radial component force generated by the continuous tightening of the bolt causes the L-shaped connecting plate 4 to expand and deform through the expansion joint 402. The entire installation check valve assembly 5 is fixed on the L-shaped connecting plate 4. Therefore, the expansion of the L-shaped connecting plate 4 will cause the entire installation check valve assembly 5 to generate a small radial displacement outward together, so that the wedge-shaped top block 704 fixed on the insertion rod 702 actively and tightly presses against the wedge-shaped braking block 604 fixed on the snap-fit ​​bracket 602. This enhances the static friction between the insertion rod 702 and the snap-fit ​​bracket 602, making it difficult for them to slide relative to each other at the joint interface. This huge pressure acts directly on the washer ring 601 through the snap-fit ​​bracket 602, which is equivalent to applying an additional and huge lateral locking force to the washer ring 601, further restricting any slight tendency of its movement. It changes from relying on spring pre-tightening to relying on structural deformation for active mechanical locking, transforming the expansion deformation of the L-shaped connecting plate 4 from a passive result into an active and beneficial driving source. This expansion amount is used to automatically strengthen the locking force of the insertion interface, achieving the effect that the more fully the fastening, the more firmly the self-locking.

[0046] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A steel profile frame, comprising a window frame body formed by connecting multiple pairs of profiles (1) at the corners via a connecting structure, characterized in that, The profile (1) has a main cavity (101) extending through its length. A pair of fastening bolts (2) are installed on the outside of the profile (1). A pair of anti-loosening parts (3) are embedded on the inside of the profile (1), corresponding to the positions of the fastening bolts (2). The anti-detachment component (3) includes a sealing cover plate (301). The profile (1) is provided with an installation groove (102) that is compatible with the sealing cover plate (301). The sealing cover plate (301) is symmetrically equipped with anti-detachment check teeth (302) on one side of the main cavity (101). The inner wall of the main cavity (101) is provided with a guide groove (103) that connects the opening of the profile (1) and the installation groove (102). A rubber pad strip (104) is fixedly connected to one side of the inner wall of the guide groove (103).

2. A steel profile frame according to claim 1, characterized in that, Each pair of the profiles (1) is provided with vertically distributed heat insulation strips (105), and each pair of the profiles (1) is fixedly connected to a number of reinforcing ribs (106) on opposite sides, with the reinforcing ribs (106) vertically located between the two heat insulation strips (105).

3. A steel profile frame according to claim 2, characterized in that, A sound-absorbing cotton (107) is provided between the two heat insulation strips (105), and a pair of profiles (1) are fitted with a sealing strip (108) above the sound-absorbing cotton (107).

4. A connection structure for a steel profile frame as described in any one of claims 1-3, characterized in that, Including L-shaped connecting plates (4) that are respectively inserted into the main cavity (101) of the adjacent profile (1), and also including: A pair of screw holes (401) are symmetrically opened on the outer sides of both ends of the L-shaped connecting plate (4) to match the fastening bolts (2). An expansion joint (402) connected to the screw holes (401) is also opened on the outer edge of the L-shaped connecting plate (4). Two sets of installation check components (5) are installed. Each set of installation check components (5) is elastically installed on both sides of the L-shaped connecting plate (4), and each set of installation check components (5) is snapped into the anti-detachment component (3). The abutment (6) is movably embedded inside the screw hole (401), and the mounting check assembly (5) abuts and engages with the abutment (6); When the fastening bolt (2) is screwed into the screw hole (401), the L-shaped connecting plate (4) expands through the expansion joint (402) and squeezes the abutment (6) to restrict the movement of the installation check assembly (5).

5. The connection structure according to claim 4, characterized in that, The installation check assembly (5) includes an abutting check rack (501) that is slidably connected to an L-shaped connecting plate (4). A pair of sliders (502) are fixedly connected to one side of the abutting check rack (501). A groove (403) matching the slider (502) is provided on the L-shaped connecting plate (4). A top spring (503) that abuts against the inner wall of the groove (403) is fixedly connected to one side of the slider (502). The abutting check rack (501) and the anti-disengagement check tooth (302) mesh with each other.

6. The connection structure according to claim 5, characterized in that, The abutting member (6) includes a washer (601) disposed in the screw hole (401), and a pair of snap-fit ​​brackets (602) are fixedly connected to the outer wall of the washer (601). An elastic plug-in member (7) for inserting into the snap-fit ​​brackets (602) is fixedly connected to one side of the abutting check rack (501).

7. The connection structure according to claim 6, characterized in that, The outer wall of the washer (601) is also fixedly connected to a pair of push rods (603). The snap-fit ​​bracket (602) and the push rods (603) are staggered. The expansion joint (402) is provided with a shrinkage groove (404) for the push rods (603) to be inserted. The push rods (603) and the inner wall of the shrinkage groove (404) are inclined to abut against each other. The shrinkage groove (404) gradually shrinks along the insertion direction of the push rods (603).

8. The connection structure according to claim 5, characterized in that, When the abutting check rack (501) is inserted into the guide groove (103) of the profile (1), one side of the abutting check rack (501) contacts the inner wall of the guide groove (103). When the fastening bolt (2) is screwed into the screw hole (401), the other side of the abutting check rack (501) abuts against the rubber pad (104).

9. The connection structure according to claim 6, characterized in that, The elastic connector (7) includes a connecting rod (701) fixed to the abutting check rack (501). The connecting rod (701) has an insert (702) that contacts the snap-fit ​​bracket (602) and a limiting protrusion (703) that abuts against the end of the insert (702) is fixedly connected inside the connecting rod (701).

10. The connection structure according to claim 9, characterized in that, The insertion rod (702) is fixedly connected to a wedge-shaped top block (704) on one side, and the inner wall of the snap-fit ​​bracket (602) is fixedly connected to a wedge-shaped brake block (604) that is in inclined contact with the wedge-shaped top block (704).

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