Variable configuration corner connection module for assembling rectangular support frames

Abstract

The utility model discloses a kind of variable configuration angular connection module for assembling rectangular support frame, it is related to support structure technical field.The module is arranged in frame four corners by alternating inside folding angular connector and outside spreading angular connector, realize the quick deformation of frame structure;Inside folding angular connector controls adjacent frame monomer to complete 90°-0° inside folding movement, outside spreading angular connector realizes 90°-180° outside spreading movement, and the synergistic effect makes frame can be efficiently switched between vertical working state and parallel folding state, significantly improve portability.The angular connector of the application discloses innovatively uses clamping piece-insert piece cooperation structure to realize self-locking function, completely replaces traditional external lock, both simplify assembly process and avoid parts missing, the design supports 2:1, 3:2, 4:3 and multiple clamping piece-insert piece quantity configuration, can be flexibly adjusted according to actual bearing demand, with extensive applicability.

Description

Technical Field

[0001] This utility model relates to the field of support structure technology, specifically to a variable configuration angular connection module for assembling a rectangular support frame. Background Technology

[0002] In the fields of industrial display systems and warehousing equipment, rectangular support frames serve as the basic load-bearing structure, and the performance of their corner connectors directly determines the overall structural stability and ease of use. Traditional rigid connection solutions, using welding or bolting, can ensure structural strength under static loads, but they have significant functional drawbacks: the frame components must be completely disassembled for transportation and storage, and recalibrated during on-site assembly. This repeated disassembly and assembly process not only increases manual labor time but also causes a gradual decrease in connection accuracy due to thread wear or deformation of positioning holes, seriously affecting the reliability of the frame for repeated use.

[0003] The key to improving portability lies in developing reliable foldable connection technology. Currently, the solutions on the market mainly fall into two categories: one uses external locking structures such as pins and buckles to fix and position the frame when placed in the working position. Each set of connectors requires an average of 3-5 separate locks for fixation, significantly increasing assembly complexity. Furthermore, external locks have a high loss rate during transportation, which may lead to on-site assembly delays. The other category uses a multi-hinge structure to connect individual frame units. While this allows for individual folding, the gaps between the joints gradually widen over long-term use, posing structural safety hazards. These problems severely restrict the practicality and reliability of foldable corner connection products.

[0004] To address the shortcomings of existing technologies, there is an urgent need in this field to develop an integrated self-locking connection solution. This solution must maintain structural compactness when the frame is folded and achieve automatic mechanical interlocking to keep the frame stable when unfolded. This innovative design will completely eliminate reliance on external locks, and is expected to improve assembly efficiency by more than 35%, significantly enhancing the market competitiveness of frame products in terms of portability, reliability, and cost-effectiveness. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by innovatively proposing a variable-configuration angular connection module for assembling rectangular support frames. Through the alternating arrangement of inward / outward angular connectors at the four corners of the frame, efficient folding deformation of the support frame is achieved. Specifically, the inward folding connectors control the 90°-0° inward folding of adjacent frame units, while the outward folding connectors enable adjacent frame units to extend outward from 90°-180°. Their synergistic effect allows the frame to quickly switch between a vertical working state and a parallel folding state. This design completely replaces traditional external locks through the self-locking function of the angular connectors, effectively preventing parts loss while improving assembly efficiency.

[0006] To achieve the above technical objectives, this utility model is implemented through the following technical solution: a variable configuration angular connection module for assembling a rectangular support frame, comprising staggered inward folding angular connectors and outward folding angular connectors, wherein: the inward folding angular connector includes a first inward folding module and a second inward folding module that are rotatably connected, enabling adjacent frame units to fold inward from 90° to 0°; the first inward folding module has several inserts at its insertion locking end; the second inward folding module has at least two clamping pieces parallel to each other at its insertion locking end, with insertion grooves formed between adjacent clamping pieces; when the first / second inward folding module is unfolded to 90°... When the angle is adjusted, the insert is inserted into the corresponding insertion slot and forms an interference fit with the clamping plates on both sides for locking; the outward angular connector includes a first outward module and a second outward module that can be rotatably connected, realizing the outward folding of adjacent frame units from 90° to 180°; the insertion locking end of the first outward module is provided with several rotating inserts; the insertion locking end of the second outward module is provided with at least two second clamping plates in parallel, and a rotating slot is formed between adjacent second clamping plates; the rotating inserts and the second clamping plates always maintain a surface contact tight fit, providing constant frictional resistance for the first / second outward modules within the 90°-180° rotation range.

[0007] Furthermore, the number of inserts and clips is configured as follows: N inserts correspond one-to-one with N+1 clips to form N insertion slots, where N≥1.

[0008] Furthermore, the number of rotating inserts and second clamping pieces is configured as follows: X rotating inserts correspond one-to-one with X+1 second clamping pieces to form X rotating slots, where X≥1.

[0009] Furthermore, inward-folding corner connectors are installed at two opposite corners of the rectangular support frame, and outward-folding corner connectors are installed at the other two opposite corners. The inward / outward-folding corner connectors are used to connect adjacent frame units.

[0010] Furthermore, the first inward folding module and the second inward folding module are connected by a hinge structure, which includes: a columnar hinge portion disposed in the side connecting groove of the first inward folding module; an annular hinge portion disposed at both ends of the side connecting groove of the second inward folding module; and a coaxial riveting member that passes through both the columnar and annular hinge portions; wherein the axial spacing of the annular hinge portion is adapted to the length of the columnar hinge portion.

[0011] Furthermore, the first extension module and the second extension module are connected by a hinge structure, which includes: concentric hinge holes penetrating both sides of the rotating insert on the first extension module; concentric hinge holes penetrating both sides of the second clamp on the second extension module; and a riveting component coaxially penetrating the concentric hinge hole structure on the rotating insert and the second clamp, for realizing the rotatable connection of the first / second extension modules.

[0012] Furthermore, one side of the rotating insert is provided with a relief arc surface, and the step surface of the first outward module is provided with an arc-shaped relief groove. The two work together to avoid mechanical interference during the 90°-180° rotation process.

[0013] Furthermore, the rotation axis of the inward-folding connector is located on the 45° angle bisector of the inner sharp corner of the frame, and the rotation axis of the outward-folding connector is located on the 45° angle bisector of the outer sharp corner of the connector body.

[0014] Furthermore, when the inward folding angle connector and the outward folding angle connector are at a 90° working angle: the fabric slots on the sides of the first / second inward folding modules connect to form a through slot; the fabric slots on the sides of the first / second outward folding modules also connect to form a through slot; this facilitates the installation of the entire screen on the frame.

[0015] The beneficial effects of this utility model are as follows:

[0016] 1. This application achieves rapid switching between vertical working state and parallel folding state of the frame through innovative collaborative design of inward folding / outward angular connectors; since the angular connectors all have self-locking function, the reliance on traditional external locks is completely eliminated, which not only improves assembly efficiency, but also eliminates the risk of parts loss.

[0017] 2. The inward / outward angular connector disclosed in this application automatically forms a mechanical interlock when the frame is unfolded through a unique clamp-insert mating structure. The contact pressure of the mating surface is evenly distributed, making it durable and easy to operate.

[0018] 3. The inward folding connector enables adjacent aluminum profiles to fold inward from 0° to 90°, while the outward folding connector enables adjacent frame units to fold outward from 90° to 180°. The modular design minimizes the volume occupied by the frame after folding, making it particularly suitable for applications with high portability requirements.

[0019] 4. This application supports various combinations of clip-insertion quantity configurations (such as 2:1, 3:2, 4:3, etc.), which can be flexibly adjusted according to load-bearing requirements and have wide applicability. Attached Figure Description

[0020] Figure 1 This is an exploded view (exploded view) of the inward-angled connector disclosed in Embodiment 1;

[0021] Figure 2 This is an isometric view of the inward-folded connector in the 0° folded state as disclosed in Example 1;

[0022] Figure 3 This is an axonometric view of the inwardly folded connector in a 90° unfolded state as disclosed in Embodiment 1, wherein sub-figure a is an axonometric view of the first angle and sub-figure b is an axonometric view of the second angle;

[0023] Figure 4 This is an exploded view (exploded view) of the outward-facing angular connector disclosed in Embodiment 1;

[0024] Figure 5 This is an isometric view of the outward-facing angular connector disclosed in Embodiment 1 in a 180° folded-back state;

[0025] Figure 6 This is an axonometric view of the outwardly extended angular connector in the 90° unfolded state disclosed in Embodiment 1, wherein sub-figure a is an axonometric view of the first angle and sub-figure b is an axonometric view of the second angle;

[0026] Figure 7 The diagram illustrates the folding process of the frame. Sub-figure a shows the unfolded state of the frame assembled with the inward / outward angular connectors designed in Embodiment 1 (axonometric view); sub-figure b shows the frame rotated and folded to the intermediate transition state; and sub-figure c shows the compact form after complete folding.

[0027] Figure 8 This is a layout diagram showing the rotation axis of the inward / outward folding angle connector;

[0028] Among them, 1-inward angle connector, 2-outward angle connector, 3-aluminum profile;

[0029] 11-First inward folding module, 12-Second inward folding module, 13-Flat round head semi-hollow rivet;

[0030] 111-Hinged post, 112-Insertion plate, 113-Cappuccino groove;

[0031] 121-Hinged ring, 122-Clamping piece, 123-Insertion groove;

[0032] 21 - First outreach module; 22 - Second outreach module;

[0033] 211-Rotating insert, 212-Concentric hole, 213-Allowing groove, 214-Allowing arc surface;

[0034] 221 - Second clamping piece, 222 - Rotary slot. Detailed Implementation

[0035] The following embodiments further illustrate the content of this utility model, but should not be construed as limiting the utility model. Any modifications and substitutions made to the methods, steps, or conditions of this utility model without departing from its essence are within the scope of this utility model.

[0036] Example 1

[0037] In this embodiment, four aluminum profiles 3 are used as frame units to construct a rectangular folding frame. Adjacent aluminum profiles 3 are connected by a variable configuration angular connection module. The variable configuration angular connection module consists of an inward folding angular connector 1 and an outward flaring angular connector 2 that are staggered at the four corners of the rectangular frame. That is, a rectangular frame needs to use two inward folding angular connectors 1 and two outward flaring angular connectors 2 to achieve overall connection.

[0038] The inward-folding angle connector 1 allows adjacent aluminum profiles 3 to fold inward from a vertical position until they are completely parallel (the included angle between adjacent aluminum profiles 3 connected by the inward-folding angle connector 1 gradually changes from 90° to 0°), while the outward-expanding angle connector 2 allows adjacent aluminum profiles 3 to expand outward from a vertical position until they are completely parallel (the included angle between adjacent aluminum profiles 3 connected by the outward-expanding angle connector 2 gradually increases from 90° to 180°). Through the alternating layout of the inward / outward-expanding angle connectors 1 / 2, the foldable function of the rectangular frame is achieved.

[0039] The inner angle connector 1 adopts an insert-type design as a whole, as shown in the reference. Figure 1-3 It consists of a first inward folding module 11 and a second inward folding module 12. One end of the first / second inward folding module 11 / 12 is a plug-in locking end, and the other end is an aluminum profile connection end. The aluminum profile connection end adopts a standardized interface design, specifically designed for quick splicing and installation with the end of the aluminum profile. This connection part is precision-machined, enabling a stable mechanical connection with common specifications of industrial aluminum profiles, ensuring the assembly accuracy and load-bearing performance of the overall structure. This modular design simplifies the installation process and improves the assembly efficiency of the frame system. After splicing with the aluminum profile 3, it can also use rivets or other locking structures to achieve secondary fixation between the corner connector and the aluminum profile 3. There are no specific limitations on these locking structures, as long as they can achieve the connection and fixation between the corner connector and the aluminum profile.

[0040] A connecting groove extending along the width direction of the corresponding inner folding module is provided on the opposite side of the first / second inner folding module 11 / 12. A hinge post 111 extending along its length direction is provided in the connecting groove of the first inner folding module 11. A hinge ring 121 is provided at each end of the connecting groove of the second inner folding module 12. The distance between the two hinge rings 121 matches the length of the hinge post 111. A hinge hole with axial penetration is provided on both the hinge post 111 and the hinge ring 121. By embedding the side curved surface of the hinge post 111 into the connecting groove of the second inner folding module 12 and placing it between the two hinge rings 121, a complete columnar connection structure is formed. A semi-hollow rivet 13 with a flat round head is used to concentrically pass through the hinge hole on the hinge ring 121 and the hinge post 111 to achieve a rotatable connection between the first and second inner folding modules 11 / 12. The flat washer installed between the mating surfaces of the semi-hollow rivet 13 with the hinge ring 121 effectively reduces frictional resistance, allowing the first and second inner folding modules 11 / 12 to rotate smoothly within the range of 0° (fully folded) to 90° (fully unfolded), which ensures structural stability and extends service life.

[0041] On both sides of the insertion locking end of the second inward folding module 12, there are two separate clamping pieces 122 integrated on both sides. The two clamping pieces 122 are parallel to each other and form an insertion groove 123 between them. On the insertion locking end of the first inward folding module 11, an insert piece 112 that matches the shape of the insertion groove 123 is integrated.

[0042] When the first inward folding module 11 and the second inward folding module 12 rotate and connect, and are fully unfolded to 90°, the insert 112 is inserted into the insertion slot 123 to the maximum extent and tightly fits the clamp 122 over a large area. At this time, the outer planes of the locking ends of the first / second inward folding modules 11 / 12 are flush, forming a complete corner. At this time, the fabric slots 113 on the sides of the first / second inward folding modules 11 / 12 are connected to form a through slot, facilitating the installation of the entire screen on the frame.

[0043] Due to the tight fit design between the insert 112 and the clip 122, when the frame is fully unfolded, unless there is any human intervention or a strong impact on the inward folding corner connector 1, the first / second inward folding module 11 / 12 can stably maintain the unfolded state and will not automatically rotate and fold inward, thus ensuring the stability of the frame.

[0044] To optimize the mating process between the insert 112 and the clamp 122, an arc-shaped transition surface structure was designed at the initial insertion end of the insert 112 (to... Figure 2The shown state is for reference. At this point, the two ends of the clip 122 closest to the insertion slot 123 are designed as arcs, instead of the conventional right-angle transition. This structure replaces the traditional right-angle transition design, significantly reducing initial insertion resistance during rotation. When the clip 112 rotates from 0° to 90°, the arc-shaped transition surface automatically corrects minor alignment deviations between the clip 112 and the insertion slot 123, providing effective guidance and ensuring the clip 112 smoothly enters the insertion slot 123. This improvement maintains the tight fit at 90° while improving the fault tolerance and ease of operation during assembly, enabling the connector to smoothly complete 90° rotation positioning.

[0045] This embodiment demonstrates a structural design that achieves module positioning through the cooperation of clips 122 and inserts 112. In the basic scheme, the upper part of the second inward folding module 12 has two parallel clips 122 forming a single insertion slot 123, which forms a tight fit with the single insert 112 on the first inward folding module 11. To enhance structural stability, an extended scheme can also be adopted: three discrete clips are set in the second inward folding module 12, forming two insertion slots, while two corresponding inserts are set in the first inward folding module 11. When the two modules are unfolded to 90°, the two inserts can be fully inserted into the corresponding insertion slots, forming a stable tight fit. It should be noted that this design does not limit the number of clips and inserts (it can even be a design with four clips corresponding to three inserts, or five clips corresponding to four inserts, etc.), and the attached drawings of the embodiment are only for illustrative purposes. In fact, any structural design that conforms to the principle of insert / clip cooperation, as long as it can achieve stable unfolding and smooth folding between modules, falls within the protection scope of this scheme.

[0046] See Figure 4-6 The outward-extending angular connector 2 consists of a first outward-extending module 21 and a second outward-extending module 22. One end of the first / second outward-extending module 21 / 22 is a plug-in locking end, and the other end is an aluminum profile connection end. The aluminum profile connection end also adopts a standardized interface design, specifically designed for quick splicing and installation with the end of the aluminum profile. After splicing with the aluminum profile, it can also be further fixed to the aluminum profile using rivets or other locking structures.

[0047] On both sides of the insertion locking end of the second extension module 22, there are two separate second clamping pieces 221 integrated on both sides. The two second clamping pieces 221 are parallel to each other and form a rotating slot 222 between them. On the insertion locking end of the first extension module 21, there is a rotating insert 211 that is adapted to the shape of the rotating slot 222.

[0048] The first / second extension module 21 / 22 is provided with a concentric hole 212 in the middle of the insertion locking end, which runs through both sides along its width direction (specifically, the concentric hole of the first extension module 21 runs through both sides of the rotating insert 211, and the two second clips 221 on the second extension module 22 are also provided with a concentric hole 212 running through both sides on the same axis). After the flat round head semi-hollow rivet 13 is concentrically connected to the concentric hole 212 on the first / second extension module 21 / 22, the two extension modules are rotatably riveted together, so that they can rotate smoothly within the range of 90° (fully unfolded) to 180° (horizontally folded).

[0049] To improve rotational smoothness and reduce wear, a flat washer is placed between the mating surfaces of the flat-headed semi-hollow rivet 13 and the concentric hole 212. This design effectively reduces frictional resistance and significantly extends the module's service life. Simultaneously, thanks to the tight fit between the rotating insert 211 and the second clamping piece 221, the large contact area between them provides sufficient frictional force, ensuring structural stability, whether the frame is fully extended or fully folded. This design offers a dual advantage: in the extended state, the frame remains stable and does not loosen; in the folded state, the structure will not accidentally unfold. Through precise mechanical coordination, both operational flexibility and stability during use are ensured, achieving a perfect combination of functionality and durability.

[0050] In both the unfolded and folded states of the frame, the outer surfaces of the locking ends of the first / second outward-extending modules 21 / 22 remain flush. When the frame is fully unfolded, the fabric slots 113 on the sides of the first / second outward-extending modules 21 / 22 connect to form a through slot, facilitating the installation of the entire image on the frame.

[0051] The stepped surface of the first outward-extending module 21 adopts an arc-shaped concave design, forming a clearance groove 213, which is recessed inward based on the end face of the aluminum profile connection end of the first outward-extending module 21. This structure ensures a smooth transition when the second outward-extending module 22 rotates from a 90° extended state to a 180° folded state, avoiding mechanical interference. The curvature of the arc-shaped surface has been precisely calculated to ensure both the freedom of rotational movement and the overall stability of the connection structure.

[0052] Similarly, a clearance arc surface 214 is also used on the side of the end of the rotating insert 211. This structure is used to ensure that the first outward module 21 can smoothly transition from the 90° unfolded state to the 180° folded state, avoiding mechanical interference with the inner side of the rotating slot 222.

[0053] Similar to the design of the inward-folding angle connector 1, this embodiment demonstrates an expandable outward-folding angle connection mechanism based on the clamp-insert fit principle. The basic scheme uses two second clamps 221 to form a single rotating slot 222, which fits tightly with a single rotating insert 211 of the first outward-folding module 21. To improve stability, it can be expanded to three second clamps 221 to form a double rotating slot 222, corresponding to the double rotating insert 211 structure, achieving double locking when unfolded at 90°. This design allows for flexible configuration of the number of clamps and inserts (e.g., a 4:3 or 5:4 combination), and all clamp-insert fit structures that achieve stable unfolding and smooth folding fall within the scope of this solution.

[0054] The rectangular frame is assembled using a diagonal symmetrical layout design: the inward folding angle connector 1 disclosed in this embodiment is installed at two diagonal positions, and the outward folding angle connector 2 disclosed in this embodiment is installed at the other two diagonal positions. During assembly, the aluminum profile connecting ends of the inward / outward folding angle connector 1 / 2 are precisely aligned and fixed with the aluminum profile ends.

[0055] With the frame unfolded, the first / second outward-extending modules 21 / 22 of the same group are set at a 90° angle vertically, and the first / second inward-folding modules 11 / 12 of the same group are also set at a 90° angle vertically. Figure 7 Neutron diagram a). Based on the tight fit between the insert and the clamp, the frame is fixed. When the frame needs to be folded, the operator needs to perform differentiated folding actions on the connecting piece 1 / 2 at the inward / outward folding angle—folding the first / second inward folding module 11 / 12 from the initial 90° working angle towards 0°, while simultaneously unfolding the first / second outward folding module 21 / 22 from 90° towards 180°. Figure 7 Neutron diagram b). After all modules are rotated to the target angle, the frame structure will automatically transform into a compact form, at which point the aluminum profiles 3 will be arranged in parallel. Figure 7 (Neutron diagram c) The overall volume is significantly reduced, facilitating transportation and storage. This folding mechanism achieves rapid conversion of the frame's folding and unfolding functions through the reverse movement design of the inward / outward folding angle towards the connector 1 / 2.

[0056] When the frame unfolds, the inward folding module and the outward unfolding module synchronously complete a 90° rotational positioning. When the frame returns from a parallel folded state to a state where adjacent frame units are perpendicular, the insert 112 of the first inward folding module 11 gradually embeds into the insertion slot 123 of the second inward folding module 12 during rotation, forming a tight, full-circumferential fit with the clamping piece 122 of the second inward folding module 12. Upon reaching the 90° design position, the large-area tight fit achieves self-locking stability. In the synchronously operating outward unfolding module group, the rotating insert 211 of the first outward unfolding module 21 and the second clamping piece 221 of the second outward unfolding module 22 always maintain a surface-contact tight fit. This interference fit design requires slight manual torque application during rotation, and it also maintains the angle once in position. The coordinated design of the two modules ensures the structural rigidity and positioning reliability of the unfolding mechanism at the terminal position.

[0057] By adjusting the dimensions of the inward folding corner connector 1 and the outward folding corner connector 2, the unfolding and folding requirements of square / rectangular frames of different sizes can be met.

[0058] Regarding the design positions of the rotation axes of the inward-folding angle connector 1 and the outward-flaring angle connector 2, please refer to... Figure 8 The specific design method is as follows:

[0059] In this embodiment, after the inward-folding angle connector 1 completes the 0°-90° rotation process, the frame unfolds into a rectangle. At this time, the rotation axis of the inward-folding angle connector 1 is located at any position on the 45° angle bisector of the inner sharp corner of the frame (this line can be understood as: when the frame folds inward, the inner vertex position forms a sharp corner, and this 45° line is the diagonal line starting from the vertex of the sharp corner and forming a 45° angle with each of the two adjacent sides of the frame). In this state, the outward-expanding angle connector 2 also completes the 180°-90° rotation process. The rotation axis of the outward-expanding angle connector 2 is located at any position on the 45° angle bisector of the outer sharp corner of the main body of the outward-expanding angle connector 2 (a reference line extending inward at a 45° angle from the vertex of the outer sharp corner of the outward-expanding angle connector 2, forming a 45° angle with each of the two outer sides of the outward-expanding angle connector 2, which is essentially the angle bisector of the plane angle of the main body of the outward-expanding angle connector 2). When the rotation axis of the connecting piece 1 / 2 is located at the above position, the frame can be unfolded into a rectangle / square or folded to overlap, realizing the quick unfolding and retraction function of the frame and minimizing the occupied volume.

[0060] This frame system adopts a pre-assembled design concept, with all aluminum profiles and inward / outward angular connectors pre-assembled at the factory. During on-site construction, simply unfold the pre-assembled frame to ensure adjacent frame units are in a 90° vertical position before use, completely avoiding the time-consuming steps of on-site assembly using external locking mechanisms, such as parts counting and gradual assembly. This modular design has dual advantages: firstly, factory pre-assembly ensures the precision of each connection node; secondly, the folding and unfolding transformation process avoids the accumulation of assembly tolerances, maintaining the original design precision. This ready-to-use assembly mode significantly improves construction efficiency while ensuring the overall structural performance of the frame system.

[0061] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. However, the above description is only a specific embodiment of this utility model, and the technical features of this utility model are not limited thereto. Any other embodiments derived by those skilled in the art without departing from the technical solution of this utility model should be included within the scope of this utility model.

Claims

1. A variable configuration angular connection module for assembling a rectangular support frame, characterized in that, It includes staggered inward-folding angle connectors and outward-folding angle connectors, wherein: The inward folding angle connector includes a first inward folding module and a second inward folding module that can be rotatably connected, enabling adjacent frame units to fold inward from 90° to 0°. The first inward-folding module has several insert plates at its plug-in locking end; The second inward folding module has at least two clamping pieces parallel to each other at the insertion locking end, and an insertion groove is formed between adjacent clamping pieces. When the first / second inward folding module is unfolded to a 90° working angle, the insert is inserted into the corresponding insertion slot and forms an interference fit with the clamping plates on both sides to lock it in place. The outward angular connector includes a first outward module and a second outward module that can be rotatably connected, enabling adjacent frame units to be outwardly folded from 90° to 180°. The first outward-extending module has several rotating inserts at its plug-in locking end; The second extension module has at least two second clips parallel to its insertion locking end, and a rotating slot is formed between adjacent second clips; The rotating insert and the second clamping plate always maintain a tight surface contact fit.

2. The variable configuration angular connection module for assembling a rectangular support frame as described in claim 1, characterized in that, The number of inserts and clips is configured such that N inserts correspond one-to-one with N+1 clips to form N insertion slots, where N≥1.

3. The variable configuration angular connection module for assembling a rectangular support frame as described in claim 1, characterized in that, The number of rotating inserts and second clamps is configured as follows: X rotating inserts correspond one-to-one with X+1 second clamps to form X rotating slots, where X≥1.

4. The variable configuration angular connection module for assembling a rectangular support frame as described in claim 1, characterized in that, The rectangular support frame has inward-folding corner connectors installed at two opposite corners and outward-folding corner connectors installed at the other two opposite corners. The inward / outward corner connectors are used to connect adjacent frame units.

5. The variable configuration angular connection module for assembling a rectangular support frame as described in claim 1, characterized in that, The first inward folding module and the second inward folding module are connected by a hinge structure, which includes: A columnar hinge portion is provided in the side connecting groove of the first inner folding module; The annular hinge portion is provided at both ends of the connecting groove on the side of the second inner folding module; and Coaxial riveted parts that penetrate both the columnar and annular hinge sections; The axial spacing of the annular hinge portion is adapted to the length of the columnar hinge portion.

6. The variable configuration angular connection module for assembling a rectangular support frame as described in claim 1, characterized in that, The first and second extension modules are connected by a plug-in hinge structure, which includes: Concentric hinge holes running through both sides of the rotating insert on the first outward module; Concentric hinge holes penetrating both sides of the second clip on the second outward-extending module; and A riveting component with a concentric hinge hole structure on the coaxial rotating insert and the second clamp is used to realize the rotatable connection of the first / second outward modules.

7. The variable configuration angular connection module for assembling a rectangular support frame as described in claim 1, characterized in that, The rotating insert has a relief arc surface on one side of its end, and the first outward module has an arc-shaped relief groove on its step surface. The two work together to avoid mechanical interference during the 90°-180° rotation process.

8. The variable configuration angular connection module for assembling a rectangular support frame as described in claim 1, characterized in that, The rotation axis of the inward-folding connector is located on the bisector of the 45° angle of the inner sharp corner of the frame, and the rotation axis of the outward-folding connector is located on the bisector of the 45° angle of the outer sharp corner of the connector body.

9. The variable configuration angular connection module for assembling a rectangular support frame as described in claim 1, characterized in that, When the inward-folding angle connector and the outward-folding angle connector are at a 90° working angle: The gusset slots on the sides of the first / second inner folding modules are connected to form a through slot; The gusseted slots on the sides of the first / second outward-extending modules are connected to form a through slot.

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