Self-stabilization type fast-folding and fast-unfolding supporting frame

Abstract

The invention discloses a self-stabilization type fast-folding and fast-unfolding supporting frame, and belongs to the technical field of supporting structures. The folding frame is formed by connecting four frame single bodies through a folding mechanism, the folding mechanism comprises two sets of inward rotation corners and two sets of outward rotation corners which are arranged diagonally, and switching of the adjacent frame single bodies between a vertical working mode and an inward parallel folding mode is achieved through the inward rotation corners. And the adjacent frame single bodies are switched between a vertical working mode and an outward parallel unfolding mode by rotating the corners outwards. A first locking piece and a second locking piece are integrated on the inner rotating corner and the outer rotating corner respectively and used for manually locking the position of the rotating corner in the working mode. A half-and-half bolt type and lap joint type pressing type integrated locking scheme is innovatively adopted, the integrated locking design completely replaces a traditional external lock, locking or releasing can be completed only through one-time operation, and the folding device has the advantages of being high in folding efficiency, convenient and fast to operate and high in stability; the method is suitable for application scenes such as exhibition, emergency rescue and the like needing rapid deployment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of support structures, in particular to a self-stabilizing fast-folding and fast-deploying support frame. BACKGROUND

[0002] In the fields of building formwork support, exhibition display stands, and temporary facility construction, foldable support frames are important structural components, and their performance directly affects construction efficiency and ease of use. Traditional support frames mainly use welded fixed or multi-part assembly structures, and generally have problems such as large transportation volume, low on-site assembly efficiency, uncontrollable assembly precision, and poor reusability. Although foldable support products have appeared on the market, they often still have technical bottlenecks such as complex structure, low operability, need for special tools to assist installation, insufficient folding ratio, etc., making it difficult to meet the requirements of modern engineering construction for rapid deployment and high mobility.

[0003] Patent CN 117275369 A discloses a folding mechanism for a frame, which realizes the rapid folding function of the frame by pre-assembling the edge frame monomers with outward and inward folding mechanisms. The outward folding mechanism can stretch adjacent edge frame monomers from a vertical state to a parallel state, while the inward folding mechanism can achieve the effect of bending inward to a parallel state. However, this technology has obvious shortcomings: the folding mechanism lacks integrated locking design, resulting in the need for additional locking devices such as external locks, fastening bolts, or other locking methods to maintain the stability of the frame after deployment. This separate design not only increases the difficulty of managing accessories, but also introduces additional assembly steps in the operation process, which significantly affects assembly efficiency in actual application.

[0004] With the development of building industrialization and the increasing demand for standardization of temporary facilities, there is an urgent need for a new type of support frame that can simultaneously meet the requirements of rapid assembly, high folding efficiency, stable bearing, and durability. This product needs to fundamentally solve the core contradiction between assembly efficiency and structural stability in existing technologies. SUMMARY

[0005] The present application aims to solve the problems in the prior art and innovatively proposes a self-stabilizing fast-folding and fast-deploying support frame that integrates the advantages of fast folding and assembly, automatic stabilization and locking, additional lock-free, high durability, and precise assembly. This effectively solves the problems of complex operation, poor stability, and the need for external locking devices in the use of traditional support frame structures.

[0006] In order to achieve the above technical purposes, the present application is realized by the following technical scheme: a self-stabilizing quick-folding and quick-expanding support frame is composed of four frame monomers connected by folding mechanisms, the folding mechanisms include: two sets of inner-turning corners arranged diagonally, each set of inner-turning corners connects two adjacent frame monomers, and realizes the switching of the adjacent frame monomers between a first working mode of mutual perpendicularity and a first storage mode of complete parallelism by being folded inward; two sets of outer-turning corners arranged diagonally, each set of outer-turning corners connects two adjacent frame monomers, and realizes the switching of the adjacent frame monomers between a second working mode of mutual perpendicularity and a second storage mode of complete parallelism by being unfolded outward;

[0007] The inner-turning corner is integrated with a first locking member for manually locking the position of the corner in the first working mode;

[0008] The outer-turning corner is integrated with a second locking member for manually locking the position of the corner in the second working mode.

[0009] Further, the inner-turning corner includes two inner-turning joint assemblies, the two inner-turning joint assemblies are concentrically and rotatably connected through the hinge hole structures on the respective side edges, and realize 0°-90° rotation, in the first working mode, the rotation axis of the inner-turning corner is located on the 45° angle bisector of the inward-pointing sharp corner of the frame (this line can be understood as: when the frame is folded inward, the sharp corner is formed at the inner vertex position, and this 45° line is the diagonal line which forms a 45° angle with each of the two side edges of the frame); the outer-turning corner includes two outer-turning joint assemblies, the two outer-turning joint assemblies are rotatably connected through the hinge structure of the connecting end, and realize 90°-180° rotation, in the second working mode, the rotation axis of the outer-turning corner is located on the 45° angle bisector of the outer end sharp corner of the outer-turning corner body (this line can be further understood as: in the second working mode, the reference line of 45° inclined inward direction is extended from the outer side end sharp corner vertex of the outer-turning joint, and forms a 45° angle with each of the two outer side edges of the outer-turning corner, which is essentially the angle bisector of the plane angle of the outer-turning corner body).

[0010] As a preferred scheme, when the connecting end of the two outer-turning joint assemblies is designed as a square, the hinge hole on the connecting end face should be arranged at the center position of the connecting end. This structure design can minimize the rotation radius of the outer-turning joint assembly when it rotates, and at the same time can maximize the structural stability of the outer-turning joint assembly, and takes into account the space adaptability and structural reliability.

[0011] As a preferred scheme, the inner-turning corner is any one of a half-type bolt or a lap-type pressing.

[0012] Further, the inner turning corner structure of the lap joint pressing type is: the inner turning corner includes an inner turning joint C and an inner turning joint D, a connecting groove is arranged on the middle side of the inner turning joint C and the top side of the inner turning joint D, respectively, a complementary hinge half column with a hinge hole is embedded in the connecting groove, after the side curved surface of the front hinge half column is embedded in the connecting groove of the inner turning joint F and the side curved surface of the rear hinge half column is embedded in the connecting groove of the inner turning joint C at the same time, the front / rear hinge half columns are coaxially butted through a flat head half hollow rivet; the free end of the inner turning joint C / D is designed in a standardized interface, which is used for splicing and installation with the frame monomer; one side of a pressing movable hole on the inner turning joint C penetrates the side surface of the inner turning joint C, a pressing buckle is hingedly connected in the pressing movable hole through a pin shaft, the outer side end of the pressing buckle is a buckle end with a chamfer, the inner side end is a pressing end, the pressing end is provided with a buckle unlocking mark; the top of the inner turning joint D is provided with a fixed buckle with a chamfer, and the chamfer surfaces of the fixed buckle and the pressing buckle are arranged in an opposite arrangement manner.

[0013] As a preferred, a screw hole is arranged on the ring surface of the plug head of the locking / unlocking plug, which is connected with the limiting groove on the side wall of the plug hole A / B through a limiting screw, and is used for limiting the movement range of the locking / unlocking plug.

[0014] As a preferred, the end of the plug rod of the locking / unlocking plug is designed in a hemispherical shape; the outer side surfaces of the locking / unlocking plug are respectively provided with locking and unlocking marks.

[0015] Further, the inner turning corner structure of the lap joint pressing type is: the inner turning corner includes an inner turning joint C and an inner turning joint D, a connecting groove is arranged on the middle side of the inner turning joint C and the top side of the inner turning joint D, respectively, a complementary hinge half column with a hinge hole is embedded in the connecting groove, after the side curved surface of the front hinge half column is embedded in the connecting groove of the inner turning joint F and the side curved surface of the rear hinge half column is embedded in the connecting groove of the inner turning joint C at the same time, the front / rear hinge half columns are coaxially butted through a flat head half hollow rivet; the free end of the inner turning joint C / D is designed in a standardized interface, which is used for splicing and installation with the frame monomer; one side of a pressing movable hole on the inner turning joint C penetrates the side surface of the inner turning joint C, a pressing buckle is hingedly connected in the pressing movable hole through a pin shaft, the outer side end of the pressing buckle is a buckle end with a chamfer, the inner side end is a pressing end, the pressing end is provided with a buckle unlocking mark; the top of the inner turning joint D is provided with a fixed buckle with a chamfer, and the chamfer surfaces of the fixed buckle and the pressing buckle are arranged in an opposite arrangement manner.

[0016] Further, the mechanical linkage system of the buckle is composed of a spring link and a compression spring, one end of the compression spring is fixed to the spring link, the other end is connected to the rear wall of the pressing buckle close to the pressing end, and the pressing buckle is maintained in the normally closed state through the pre-tightening force of the compression spring, and when an external force is applied, the pressing buckle is driven to rotate around the pin shaft to achieve unlocking.

[0017] Further, the outer rotating corner is a half type latch, and the specific structure is as follows: the outer rotating connector A and the outer rotating connector B are rotatably connected through the hinge holes on the connecting ends of the two, and 90-180° rotation is realized; the bottom of the outer rotating connector A / B is designed with a standardized interface, which is used for splicing and installation with the frame monomer; the lower right corners of the connecting ends of the outer rotating connector A / B are respectively provided with through-type latch through holes A and B, which are used for assembling the second locking member; the latch through hole A is used for assembling the second locking latch; the latch through hole B is used for assembling the second unlocking latch; the inner side ends of the latch through holes A / B are respectively provided with second limiting steps A and B, which are respectively used for limiting the maximum stroke of the second locking / unlocking latch; the length of the insertion rod of the second locking latch is greater than that of the second unlocking latch; when the outer rotating connector A / B is arranged at 90° and the latch through holes A / B are concentrically aligned, the second locking latch is pressed inward to the position where it contacts the second limiting step A, and the insertion rod of the second locking latch penetrates into the latch through hole B, and the second unlocking latch is ejected to lock the system; the second unlocking latch is pressed inward to the position where it contacts the second limiting step B, and the end of the second unlocking latch stays at the interface between the outer rotating connector A and B, and the mechanical connection between the outer rotating connector A and B is released; O-rings are assembled on the inner side grooves of the insertion rod of the second locking / unlocking latch, and the O-rings and the inner walls of the latch through holes A / B form an interference fit.

[0018] As a preferred, a second thread hole is arranged on the insertion rod ring surface of the second locking / unlocking latch, and is connected with the second limiting groove on the side wall of the latch through hole A / B through a limiting screw, so as to limit the movement range of the second locking / unlocking latch.

[0019] As a preferred, the inner side step surface of the outer rotating connector A / B forms a concave arc surface which is recessed inward based on the connector bottom surface.

[0020] As a preferred, the end of the insertion rod of the second locking / unlocking latch is designed in a semispherical shape.

[0021] As a preferred, the outer side surfaces of the second locking / unlocking latch are respectively provided with locking and unlocking marks.

[0022] The beneficial effects of the present application are as follows:

[0023] 1. The self-stabilizing quick-folding and quick-expanding support frame disclosed in the application realizes the quick switching of adjacent frame units between the vertical working state and the parallel storage state through the diagonally arranged inner and outer turning corner structures. The structure not only significantly improves the folding and storage efficiency, but also realizes the instant locking in the working mode through the built-in locking member integrated in the corner mechanism. This integrated locking system design completely discards the traditional external lock, greatly simplifies the operation process, and greatly improves the overall assembly efficiency.

[0024] 2. The inner / outer turning corner mechanism disclosed in the application mainly includes two types of half-type latch and lap-type pressing. The half-type latch forms reliable mechanical interlocking through the interference sealing effect of O-ring combined with the different length of locking / unlocking latch. The lap-type pressing maintains the stable engagement state of the chamfer buckle by the spring pre-tightening force. The different forms of corner mechanisms provided by the application have the characteristics of simple structure and intuitive operation. Users can complete the whole process operation of locking and unlocking with simple actions. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a folding process schematic diagram of the foldable frame structure, wherein subgraph a shows the initial state (axonometric drawing) of the frame assembled by the inner / outer turning corner; subgraph b presents the frame rotating and folding to the intermediate transition state; and subgraph c is the compact form after complete folding;

[0026] Figure 2 is an exploded view of the inner turning joint A;

[0027] Figure 3 is an axonometric drawing of the inner turning joint A;

[0028] Figure 4 is an exploded schematic diagram (exploded view) of the inner turning corner assembly disclosed in embodiment 1;

[0029] Figure 5 is a working state comparison diagram of the inner turning joint A / B, wherein subgraph a is a 90° locking assembly state schematic diagram, and subgraph b is an unlocking and separating state schematic diagram;

[0030] Figure 6 is a cross-sectional view of the joint surface of the inner turning joint A / B in the locked state;

[0031] Figure 7 is an exploded view of the outer turning joint A;

[0032] Figure 8 is an axonometric drawing of the outer turning joint A;

[0033] Figure 9 is an exploded schematic diagram (exploded view) of the outer turning corner assembly disclosed in embodiment 1;

[0034] Figure 10 Working state comparison diagram of outer adapter A / B, where sub-diagram a is a 90° locking assembly state diagram, and sub-diagram b is an unlocking separation state diagram;

[0035] Figure 11 Cross-sectional view of the combined surface of the outer adapter A / B in the locked state;

[0036] Figure 12 The folding process of the frame is shown in the schematic diagram, where sub-diagram a shows the initial state (axonometric view) of the frame assembled with the inner / outer turning corner assembly designed in embodiment 1; sub-diagram b presents the intermediate transition state of the frame rotating and folding; and sub-diagram c is the compact form after complete folding.

[0037] Figure 13 The corresponding frame reset process schematic diagram is shown, where sub-diagram a starts from the fully folded state; sub-diagram b shows the intermediate form during unfolding; and sub-diagram c finally presents the reset complete working state;

[0038] Figure 14 The exploded view (explosion diagram) of the inner turning corner assembly disclosed in embodiment 2 is shown;

[0039] Figure 15 Working state comparison diagram of inner adapter C / D, where sub-diagram a is an unlocking separation state diagram, sub-diagram b shows the front view of the inner turning corner structure in the 90° locking assembly state, and sub-diagram c shows the back view of the inner turning corner structure in the 90° locking assembly state;

[0040] Wherein, 01 is the inner turning corner, 02 is the outer turning corner, and 03 is the aluminum profile;

[0041] 11 is the inner adapter A, and 12 is the inner adapter B;

[0042] 111 is the hinge hole, 112 is the half hollow rivet, 113 is the latch hole A, 114 is the locking latch, 115 is the O-ring, 116 is the wire hole, 117 is the limiting groove, 118 is the limiting screw, and 119 is the limiting step A;

[0043] 121 is the latch hole B, 122 is the unlocking latch, 123 is the limiting step B, and 124 is the clamping groove;

[0044] 21 is the outer adapter A, and 22 is the outer adapter B;

[0045] 211 is the connecting hole, 212 is the flat round head half hollow rivet, 213 is the latch through hole A, 214 is the second locking latch, 215 is the second wire hole, 216 is the second limiting groove, 217 is the relief arc surface, and 218 is the second limiting step A;

[0046] 221 - bolt through hole B, 222 - second unlocking bolt, 223 - second limiting step B, 224 - second clamping groove;

[0047] 31 - inner swivel joint C, 32 - inner swivel joint D;

[0048] 311 - connecting groove, 312 - front hinged half column, 313 - half column hinged hole, 314 - pressing movable hole, 315 - pin shaft, 316 - pressing buckle, 317 - spring connecting rod, 318 - compression spring;

[0049] 321 - rear hinged half column, 322 - fixed buckle. DETAILED DESCRIPTION

[0050] The following examples further illustrate the content of the present application, but should not be construed as limiting the application. Modifications and substitutions to the methods, steps or conditions of the present application, without departing from the spirit of the present application, all belong to the scope of the present application.

[0051] In order to realize the fast folding and unfolding and self-stabilization of the support frame, a kind of foldable frame structure is disclosed in the embodiment, and the design idea is referred to Figure 1 which is composed of four aluminum profiles (frame monomers) connected by folding mechanisms, and the folding mechanisms are composed of two inner swivel joints 01 and two outer swivel joints 02. The two inner swivel joints 01 are diagonally arranged, and the two outer swivel joints 02 are also diagonally arranged, that is, the inner swivel joints 01 and the outer swivel joints 02 are arranged at intervals on the four corners of a frame. The inner swivel joint 01 can make the adjacent aluminum profile 03 fold inward from the vertical state to the completely parallel state (the included angle gradually changes from 90° to 0°), and the outer swivel joint 02 can make the adjacent aluminum profile 03 unfold outward from the vertical state to the completely parallel state (the included angle gradually increases from 90° to 180°). Through the symmetrical layout of the inner / outer swivel joints, the folding function of the frame is realized.

[0052] Specifically, the inner swivel joint 01 adopts a double inner swivel joint assembly side edge hinge design, and the rotatable connection is realized through the symmetrically arranged concentric hinge holes on the side edges, and the process of 0°-90° rotation is completed. In the working mode (i.e. in the unfolded state of the frame), the rotation axis of the inner swivel joint is located on the 45° angle bisector of the inward pointed corner of the frame; the outer swivel joint 02 adopts a double outer swivel joint assembly hinge design, and the rotatable connection is realized by setting coaxial hinge holes at the connecting end, and the process of 90°-180° rotation is completed. In the working mode (i.e. in the unfolded state of the frame), the rotation axis of the outer swivel joint 02 is located on the 45° angle bisector of the outer end pointed corner of the outer swivel joint 02 (see Figure 1 Fig. a). When the rotation axes of the inner / outer swivel joints are located at the above positions, the frame can be unfolded into a rectangle / square, and also can be folded to coincide, so as to realize the minimum occupied volume.

[0053] When folding the frame, the inner turning corner 01 is folded from the initial 90° working angle to 0° direction, while the outer turning corner 02 is unfolded from 90° to 180° direction (see Figure 1 Neutron diagram b). When all the joints are rotated to the target angle, the frame structure will automatically convert to a compact form, and each aluminum profile 03 is in a parallel arrangement state Figure 1 Neutron diagram c), the overall volume is significantly reduced, which is convenient for transportation and storage. This folding mechanism is designed through the reverse movement of the inner / outer turning joints, which realizes the quick folding and unfolding function conversion of the frame. The opposite direction operation can be used to unfold the frame.

[0054] In addition, in order to realize the self-stabilization of the frame in the working mode, locking members are integrated on the inner turning corner 01 and the outer turning corner 02 respectively, which are used to manually lock the corner position in the working mode.

[0055] And by adjusting the size of the inner turning joint assembly and the outer turning joint assembly, the unfolding and folding requirements of square / rectangular frames of different sizes can be realized.

[0056] The above describes the design idea of the foldable frame structure, and the specific structure of the inner and outer turning corners will be described in detail in the subsequent embodiments.

[0057] Example 1

[0058] The inner turning corner 01 and the outer turning corner 02 disclosed in this embodiment are half-type bolted, and the structure of the inner turning corner 01 and the outer turning corner 02 will be described in detail as follows:

[0059] Reference Figures 2-6 Each inner turning corner includes two inner turning joints with the same structure and in a stepped shape, which are respectively denoted as inner turning joint A11 and inner turning joint B12. A hinge block extending along the width direction of the inner turning joint is arranged on the side of the inner turning joint, and a hinge hole 111 extending along the length direction of the hinge block is arranged on the hinge block. After the half-hollow rivet 112 with a flat head is connected to the hinge holes 111 on the sides of the inner turning joints A and B (11 / 12) in a concentric manner, the inner turning joints A and B (11 / 12) are rotatably connected together, realizing smooth rotation from 0° (fully folded) to 90° (fully unfolded). A flat washer is arranged between the mating surfaces of the half-hollow rivet 112 and the hinge hole 111 to reduce friction and reduce the wear of the inner turning joint during rotation, thereby prolonging the service life.

[0060] The bottom of the inner adapter A 11 and the inner adapter B 12 adopts a standardized interface design, which is specially used for quick splicing and installation with the end of aluminum profiles. This connection part is precisely processed and can form a stable mechanical connection with common specifications of industrial aluminum profiles, ensuring the assembly accuracy and load-bearing performance of the overall structure. After splicing, auxiliary fixation can be performed using bolts and other fixing parts, but this secondary fixation method is not a necessary technical feature of the present application, and its specific implementation form is not limited by the present scheme. This modular design simplifies the installation process and improves the assembly efficiency of the frame system.

[0061] The upper part of the inner adapters A and B (11 / 12) is a connection end, and a plug hole passing through both sides is arranged in the middle of the connection end, which is respectively referred to as plug hole A 113 and plug hole B 121, and is used for installing locking plug 114 and unlocking plug 122 respectively. The outer side of the locking plug 114 and the unlocking plug 122 adopts a differential identification design, and is respectively etched with an intuitive locking and unlocking pattern. This visual differentiation scheme enables the operator to quickly and accurately identify the two plugs, effectively avoiding confusion during assembly. The pattern identification adopts a standardized industrial symbol, which not only maintains the uniformity of the product appearance, but also improves the operation convenience of human-computer interaction.

[0062] The locking plug 114 and the unlocking plug 122 are the same in structure but differ in the length of the respective insertion rods: the insertion rod of the locking plug 114 is longer, and when the locking plug 114 is pressed inward to the limit position, the insertion rod penetrates into the plug hole B 121; the insertion rod of the unlocking plug 122 is shorter, and when the unlocking plug 122 is pressed inward to the limit position, the end of the insertion rod just stays at the interface between the inner adapters A and B (11 / 12). This differential length design realizes precise switching of the mechanism between the locked and unlocked states.

[0063] A recess for assembling an O-ring 115 is arranged on the inner side of the plug head of the locking plug 114 and the unlocking plug 122, and when the locking / unlocking plug 114 / 122 is inserted into the corresponding plug hole, the O-ring 115 forms an interference fit with the inner wall of the plug hole A / B (113 / 121), generating sufficient friction force to ensure that only artificial pressure can be applied to the plug head to move the corresponding plug, thereby realizing reliable locking / unlocking operation, which effectively avoids the problem of accidental locking caused by vibration during transportation or handling.

[0064] The pin head ring surface of the locking / unlocking pin 114 / 122 is provided with a threaded hole 116, and the side wall of the pin hole A / B (113 / 121) is correspondingly provided with a limiting groove 117 extending along the width direction of the inner joint. During assembly, the corresponding threaded hole 116 and the limiting groove 117 are aligned, and the limiting screw 118 is penetrated to connect, so that the locking / unlocking pin 114 / 122 can only move within the length range of the limiting groove 117, which not only prevents the pin from being inserted too much, but also avoids accidental falling, and realizes the reliable stroke limiting function.

[0065] The inner side of the pin hole A / B (113 / 121) is respectively provided with a limiting step A 119 and a limiting step B 123, which are respectively used to limit the maximum stroke of the locking / unlocking pin 114 / 122. When the inner joint A / B (11 / 12) is arranged at 90° and the pin hole A / B (113 / 121) is concentrically aligned, pressing the locking pin 114 on the inner joint A11 to the limit position (at this time, the inner side of the pin head of the locking pin 114 contacts the limiting step A 119), the locking pin 114 will be penetrated into the pin hole B 121, at this time, the unlocking pin 122 is pushed outwards, the pin hole of the inner joint A / B is penetrated by the locking pin 114 at the same time, and the system enters the locking state (for reference Figure 6 ). When unlocking, press the unlocking pin 122, the shorter plug rod of the unlocking pin 122 will push the locking pin 114 back to the direction of the inner joint A11, when the unlocking pin 122 is inserted to the limit position (at this time, the inner side of the pin head of the unlocking pin 122 contacts the limiting step B 123), the contact point of the plug rod of the unlocking pin 122 and the locking pin 114 is just at the position of the dividing plane of the inner joint A / B (11 / 12), that is, at this time, the pin hole of the inner joint A / B (11 / 12) is not hard connected, the mechanical connection between the inner joint A / B (11 / 12) is released, and the rotation function is restored. The structure realizes reliable locking / unlocking switching through the length difference of the plug rod.

[0066] The plug rod end of the locking pin 114 and the unlocking pin 122 adopts a hemispherical design, when the inner joint A11 and B12 are relatively rotated to the 90° position, if there is a slight alignment deviation, the hemispherical end surface can automatically guide the pin to slide into the correct position, ensuring that the rotating angle mechanism is smoothly positioned. This guiding structure effectively compensates for the assembly tolerance, so that the system can still reliably complete 90° positioning under non-ideal alignment conditions.

[0067] The plurality of clamping grooves 124 on the front and back surfaces of the inner joint are connected into a through groove in the 90° rotating angle state, and this multi-groove design provides flexible expandability, which is convenient for frame installation of the whole picture.

[0068] Reference Figures 7-11Each outer rotation corner includes two outer rotation joints with the same structure and in a stepped shape, respectively denoted as outer rotation joint A 21 and outer rotation joint B 22, the upper part of the outer rotation joint is a connecting end, an axial concentric connecting hole 211 is arranged on the connecting end, a flat head semi-hollow rivet 212 is used to connect the connecting holes 211 on the outer rotation joint A and B (21 / 22) in a concentric manner, and then the two outer rotation joints are rotatably connected together to realize smooth rotation of 90°-180°. A flat washer is arranged between the matching surface of the flat head semi-hollow rivet 212 and the connecting hole 211 to reduce friction and reduce the wear of the outer rotation joint during rotation, thereby prolonging the service life.

[0069] The bottom part of the outer rotation joint A 21 and the outer rotation joint B 22 also adopts a standardized interface design, which is specially used for quick splicing and installation with the end part of the aluminum profile.

[0070] The lower right corner position of the connecting end of the outer rotation joint A and B (21 / 22) is provided with a plug pin through hole penetrating through both sides, which is correspondingly denoted as plug pin through hole A 213 and plug pin through hole B 221, and is respectively used for assembling a second locking plug pin 214 and a second unlocking plug pin 222. The outer side of the second locking plug pin 214 and the second unlocking plug pin 222 adopts a differential identification design, and is respectively etched with an intuitive locking and unlocking pattern, which helps the operator to quickly and accurately identify the two plug pins.

[0071] The second locking plug pin 214 and the second unlocking plug pin 222 are the same in structure but different in length of the plug rod: the plug rod of the second locking plug pin 214 is longer, and when the second locking plug pin 214 is pressed inward to the limit position, the plug rod penetrates into the plug pin through hole B 221; the plug rod of the second unlocking plug pin 222 is shorter, and when the second unlocking plug pin 222 is pressed inward to the limit position, the end part of the plug rod just stays on the interface between the outer rotation joint A and B (21 / 22). This differential length design realizes accurate switching of the mechanism between the locking and unlocking states.

[0072] A recess for assembling an O-ring is arranged in the inner side of the plug pin head of the second locking plug pin 214 and the second unlocking plug pin 222, when the second locking / unlocking plug pin 214 / 222 is inserted into the corresponding plug pin through hole, the O-ring is in interference fit with the inner wall of the plug pin through hole A / B (213 / 221), enough friction force is generated to ensure that only artificial pressure can be applied to the plug pin head to move the corresponding plug pin, thereby realizing reliable locking / unlocking operation, which effectively avoids the problem of accidental locking caused by vibration during transportation or carrying.

[0073] The second pin head ring surface of the second locking / unlocking pin 214 / 222 is provided with a second wire hole 215, and a second limiting groove 216 extending along the outer adapter width direction is correspondingly arranged on the side wall of the pin through hole A / B (213 / 221). During assembly, by aligning the second wire hole 215 and the second limiting groove 216, and penetrating the limiting screw 118, the second locking / unlocking pin 214 / 222 can only move within the length range of the second limiting groove 216, which not only prevents the pin from being inserted too much, but also avoids accidental falling, and realizes the reliable stroke limiting function.

[0074] The inner side step surface of the outer adapter A / B (21 / 22) is designed as an arc-shaped recess, and the yielding arc surface 217 is recessed inward based on the adapter bottom surface. This structure design ensures that the adapter top can smoothly transition without mechanical interference during the process of rotating the same group of outer adapters A / B from 90° to 180°. The curvature of the arc surface is accurately calculated to ensure the freedom of rotation and maintain the overall stability of the connection structure.

[0075] The inner side end of the pin through hole A / B (213 / 221) is respectively provided with a second limiting step A 218 and a second limiting step B 223, which are respectively used to limit the maximum stroke of the second locking / unlocking pin 214 / 222. When the outer adapter A / B (21 / 22) is arranged at 90° and the pin through hole A / B (213 / 221) is concentrically aligned, pressing the second locking pin 214 on the outer adapter A 21 to the limit position (at this time, the inner side surface of the pin head of the second locking pin 214 contacts the second limiting step A 218), the second locking pin 214 will penetrate into the pin through hole B 221, at this time, the second unlocking pin 222 is pushed outwards, the pin through hole of the outer adapter A / B (21 / 22) is penetrated by the second locking pin 214 at the same time, and the system enters the locking state (refer to Figure 11 ). When unlocking, press the second unlocking pin 222, the shorter pin rod of which will push the second locking pin 214 back to the direction of the outer adapter A 21, when the second unlocking pin 222 is pushed inward to the limit position (at this time, the inner side surface of the pin head of the second unlocking pin 222 contacts the second limiting step B 223), the contact point of the pin rod of the second unlocking pin 222 and the second locking pin 214 is just at the position of the dividing plane of the outer adapter A / B (21 / 22), that is, at this time, the pin through hole of the outer adapter A / B (21 / 22) is not hard connected, the mechanical connection between the outer adapters A / B (21 / 22) is released, and the rotation function is restored. This structure realizes reliable locking / unlocking switching through the length difference of the pin rod.

[0076] The plug end of the second locking bolt 214 and the second unlocking bolt 222 adopts a hemispherical design. When the outer adapter A and B are relatively rotated to a 90° position, if there is a slight alignment deviation, the hemispherical end surface can automatically guide the bolt to slide into the correct position, ensuring that the corner mechanism is smoothly positioned. This guiding structure effectively compensates for the assembly tolerance, so that the system can still reliably complete the 90° positioning under non-ideal alignment conditions.

[0077] The plurality of second clamping grooves 224 on the front and back surfaces of the outer adapter are connected to form a through groove in the 90° corner state. This multi-groove design provides flexible expandability, facilitating the installation of a whole picture frame.

[0078] The assembly of the frame adopts a diagonal symmetrical layout design: two diagonal positions are respectively provided with the inner turning corner disclosed in the embodiment, and the other two diagonal positions are respectively provided with the outer turning corner disclosed in the embodiment. During assembly, the bottom connecting end of the inner turning adapter A / B and the outer turning adapter A / B is precisely clamped and connected with the end of the aluminum profile, and a common locking mechanism can also be used to fix all connection nodes (the profile locking mechanism is not the content to be protected by the present application, and therefore will not be described in detail here, as long as it can realize the connection and fixation between the aluminum profile and the inner / outer turning adapter). Finally, a complete frame structure is formed. The assembly scheme realizes the mechanical balance and assembly convenience of the frame structure through the alternating distribution of the inner and outer turning adapters.

[0079] The folding operation process of the frame is as follows: first, press the unlocking bolt / second unlocking bolt at the four corners of the frame to the limit position, so that the locking mechanism of the inner turning adapter A / B (11 / 12) and the outer turning adapter A / B (21 / 22) is completely disengaged. At this time, each group of adapters restores the free rotation function, and the operator needs to implement differential folding actions on the inner / outer turning adapters - fold the same group of inner turning adapters A / B from the initial 90° working angle to 0° direction, while unfolding the same group of outer turning adapters A / B from 90° to 180° direction (see Figure 12 When all the adapters are rotated to the target angle, the frame structure will automatically convert to a compact form, and each aluminum profile 03 is in a parallel arrangement state, and the overall volume is significantly reduced, facilitating transportation and storage. The folding mechanism realizes the quick folding and unfolding function conversion of the frame through the reverse motion design of the inner / outer turning adapters.

[0080] The frame unfolding operation is performed according to the following steps (process reference Figure 13):Firstly, manually rotate the frame components in folded state step by step, when the frame is rotated to the state shown in subfigure c, i.e. all the inner / outer adapters are reset to 90° working angle, press the four locking pins / second locking pins 114 / 222 at the corners inward to the limit stroke respectively. At this time, the locking pins 114 will simultaneously penetrate the pin holes of the same group of inner adapters A / B (11 / 12), and the second locking pins / 222 will simultaneously penetrate the pin through holes of the same group of outer adapters A / B (21 / 22), and the rigidity of each group of adapters is achieved through mechanical interlocking. After the above operation is completed, the frame structure restores to stable working form, and each connection node meets the design bearing requirement, and can be immediately put into normal use. The unfolding mechanism through the symmetrical distribution of the locking system ensures the reliability and operation convenience of the frame form conversion.

[0081] The frame system adopts the pre-assembly design concept, and all aluminum profiles and inner / outer adapter assemblies are precisely assembled before leaving the factory. When on-site construction, only the pre-assembled frame needs to be unfolded to put into use, completely avoiding the time-consuming links such as part counting and step-by-step assembly caused by traditional on-site assembly using external locking mechanism. This modular design scheme has double advantages: on the one hand, the cooperation precision of each connection node is ensured through factory pre-assembly, and on the other hand, the form conversion process of folding and unfolding does not produce assembly tolerance accumulation, and always maintains the original design precision. This open and use assembly mode significantly improves the construction efficiency, while ensuring the overall structural performance of the frame system.

[0082] Embodiment 2

[0083] This embodiment is based on the structure innovation of embodiment 1, and the main improvement point is to adopt the modular splicing pressing type inner turning corner mechanism, and the structure of outer turning corner is not changed.

[0084] The specific structure of the inner turning corner disclosed in this embodiment is as follows:

[0085] Referring to Figures 14-15The inner turning corner is composed of an inner turning connector C 31 and an inner turning connector D 32, and a connecting groove 311 extending along the width direction of the inner turning corner is arranged on the middle side of the inner turning connector C 31 and the top side of the inner turning connector D 32, respectively. A front hinged half column 312 and a rear hinged half column 321 with the same shape are respectively embedded in the connecting groove 311 of the inner turning connector C / D (31 / 32). A half column hinged hole 313 extending through the length of the front / rear hinged half column 312 / 321 is arranged in the front / rear hinged half column 312 / 321. After the side curved surface of the front hinged half column 312 is embedded in the connecting groove 311 of the inner turning connector D 32 and the side curved surface of the rear hinged half column 321 is synchronously embedded in the connecting groove 311 of the inner turning connector C 31, the front / rear hinged half column 312 / 321 is spliced into a complete long column structure. A flat round head semi-hollow rivet 212 is used to penetrate the half column hinged hole 313 of the front / rear hinged half column 312 / 321 for spin riveting fixation, thereby realizing coaxial and rotatable connection of the inner turning connector C / D (31 / 32). A flat washer is arranged between the mating surface of the flat round head semi-hollow rivet 212 and the half column hinged hole 313 to reduce friction and wear of the inner turning connector during rotation, thereby prolonging the service life. The design ensures the stability and assembly accuracy of the rotating mechanism through the double cooperation of half column mutual embedding and coaxial fixation of the rivet.

[0086] The bottom end of the inner turning connector C 31 and the inner turning connector D 32 adopts a standardized interface design, which is specially used for quick splicing and installation with the end of aluminum profile. The connecting part is precisely machined and can form a stable mechanical connection with common specifications of industrial aluminum profiles, thereby ensuring the assembly accuracy and bearing performance of the overall structure.

[0087] The pressing movable hole 314 on the inner turning connector C 31 adopts a lateral through design, one side of which penetrates the side surface of the inner turning connector C 31. A pin shaft 315 is installed in the pressing movable hole 314 as a rotating fulcrum along the height direction of the inner turning connector C 31. A rotatable pressing buckle 316 is assembled on the pin shaft 315. The outer side end of the pressing buckle 316 is a buckle end with a chamfer structure, and the inner side end is a pressing end. The mechanical linkage system of the pressing buckle is composed of a spring connecting rod 317 and a compression spring 318. One end of the compression spring 318 is sleeved and fixed on the spring connecting rod 317, and the other end is fixed on the rear wall surface of the pressing buckle 316. The compression spring 318 is arranged on the side deviated from the pressing end of the pressing buckle 316, thereby forming an elastic return mechanism.

[0088] In order to facilitate operation, a buckle unlocking mark is specially provided on the outer surface of the pressing end of the pressing buckle 316. The structure maintains the normal position of the buckle through the spring pre-tightening force. When the pressing force is applied, the pressing buckle 316 rotates around the pin shaft 315 to realize the unlocking function. The chamfered buckle end ensures the smoothness of the guidance during connection. The overall design realizes the balance between reliable locking and convenient operation.

[0089] The inner adapter D 32 is fixed with a fixed buckle 322 with a chamfer, and in the assembled structure, the chamfer surface of the fixed buckle 322 and the chamfer surface of the pressing buckle 316 are arranged in a symmetrical manner, which ensures the stable engagement of the buckle mechanism.

[0090] The frame folding operation includes two key steps of unlocking and folding. First, the unlocking operation is performed: the buckle unlocking mark on the inner adapter C is pressed to make the buckle end of the pressing buckle 316 pop out, and the compression spring 318 is further compressed, at this time the pressing buckle 316 is separated from the fixed buckle 322, and the inner adapter C / D is only connected by the hinge connection and can realize the free rotation function. After the unlocking is completed, the folding stage is entered: the inner adapter C / D is rotated and folded from the initial 90° working position to the 0° direction, and the outer adapter is simultaneously expanded from 90° to 180°. When the folding action is completed, the inner adapter C / D reaches the predetermined folding state (as shown in FIG. a), and all aluminum profiles are arranged in a neat and parallel folding arrangement. Figure 15

[0091] The frame unfolding operation needs to be performed in steps: first, the folded parts are unfolded in sequence, when the inner and outer adapters approach the 90° working angle, the fixed buckle 322 of the inner adapter D 32 enters the inner adapter C 31. At this time, the chamfered surface of the fixed buckle 322 contacts and rubs with the chamfered surface of the pressing buckle 316, and under the extrusion action, the pressing buckle 316 rotates around the pin shaft 315 and makes its buckle end pop out. After rotating to the 90° working angle, the buckle is disengaged, and the pressing buckle 316 is reset under the action of the compression spring 318, and forms interlocking with the fixed buckle 322, completing the fixation of the inner adapter. Then the locking operation of the outer adapter is performed, and the specific method is performed according to the embodiment 1. The process realizes stable locking through the precise cooperation of the mechanical structure, and ensures that the frame remains in a stable working state after unfolding.

[0092] In the 90° corner state, the card groove slots arranged on the front and rear sides of the inner adapter C / D are mutually penetrated, which facilitates the installation of the frame on the whole picture.

[0093] The above shows and describes the basic principles, main features and advantages of the present application. However, the above description is only a specific embodiment of the present application, and the technical features of the present application are not limited to this. Any other implementation manner obtained by those skilled in the art without departing from the technical solution of the present application should be covered in the scope of the present application.​

Claims

1. A self-stabilizing quick-folding and quick-unfolding support frame, comprising four frame units connected by a folding mechanism, characterized in that, The folding mechanism includes: Two sets of inward turning corners are arranged diagonally, and each set of inward turning corners connects two adjacent frame units, realizing the switching between the first working mode of adjacent frame units being perpendicular to each other and the first storage mode of folding inward to be completely parallel. Two sets of outward turning corners are set diagonally, and each set of outward turning corners connects two adjacent frame units, realizing the switching between the adjacent frame units in the second working mode that is perpendicular to each other and the second storage mode that unfolds outward to be completely parallel; The inner corner is integrated with a first locking element for manually locking the corner position during the first working mode; The outer corner is integrated with a second locking element for manually locking the corner position during the second working mode.

2. The self-stabilizing quick-folding and quick-deploying support frame as described in claim 1, characterized in that, The inner rotating corner includes two inner rotating joint assemblies. The two inner rotating joint assemblies are concentric and rotatably connected through the hinge hole structure on their respective sides to achieve 0°-90° rotation. In the first working mode, the rotation axis of the inner rotating corner is located on the 45° angle bisector of the inner sharp corner of the frame. The outer rotating angle includes two outer adapter assemblies, which are rotatably connected by a hinge structure at the connection end to achieve 90°-180° rotation. In the second working mode, the rotation axis of the outer rotating angle is located on the 45° angle bisector of the outer end of the outer rotating angle body.

3. The self-stabilizing quick-folding and quick-unfolding support frame as described in claim 2, characterized in that, The inner rotation angle includes inner adapter A and inner adapter B. Inner adapters A and B are concentrically connected through hinge holes on their respective sides to achieve rotation from 0° to 90°. The bottom of inner adapters A and B adopts a standardized interface design for splicing and installation with the frame unit. The upper center of the inner adapters A / B is provided with pin hole A and pin hole B respectively, for assembling the first locking element; Pin hole A is used to assemble the locking pin; pin hole B is used to assemble the unlocking pin. The inner ends of the pin holes A and B are respectively provided with a limiting step A and a limiting step B to limit the maximum stroke of the locking / unlocking pin; The length of the locking pin is greater than that of the unlocking pin; When the inner adapters A and B are arranged at 90° and the pin holes A and B are concentrically aligned, when the locking pin is pressed inward to its contact limit step A, its insertion rod passes through the pin hole B, and the unlocking pin is pushed out to lock the system; when the unlocking pin is pressed inward to its contact limit step B, its insertion rod end stays at the interface of the inner adapters A and B, releasing the mechanical connection of the inner adapters A and B; O-rings are fitted on the inner grooves of the locking and unlocking pin heads, and the O-rings form an interference fit with the inner walls of the pin holes A / B.

4. The self-stabilizing quick-folding and quick-unfolding support frame as described in claim 3, characterized in that, The locking / unlocking pin has a threaded hole on its head ring surface, which is connected to the limiting groove on the side wall of the pin hole A / B by a limiting screw to limit the movement range of the locking / unlocking pin.

5. The self-stabilizing quick-folding and quick-unfolding support frame as described in claim 3, characterized in that, The locking / unlocking pin has a hemispherical design at the end; the outer sides of the locking / unlocking pin are marked with locking and unlocking indicators respectively.

6. The self-stabilizing quick-folding and quick-unfolding support frame as described in claim 2, characterized in that, The external rotation angle includes external adapter A and external adapter B. The bottom of external adapter A / B adopts a standardized interface design for splicing and installation with the frame unit. The lower right corners of the A / B connection ends of the external adapter are respectively provided with through-hole A and through-hole B for assembling the second locking component; Through-hole A is used to assemble the second locking pin; through-hole B is used to assemble the second unlocking pin. The inner ends of the pin through holes A / B are respectively provided with a second limiting step A and a second limiting step B, which are used to limit the maximum stroke of the second locking / unlocking pin; The length of the second locking pin is greater than that of the second unlocking pin; When the external adapters A and B are arranged at 90° and the pin through holes A and B are concentrically aligned, when the second locking pin is pressed inward until it contacts the second limiting step A, its rod passes through the pin through hole B, and the second unlocking pin is pushed out to lock the system; when the second unlocking pin is pressed inward until it contacts the second limiting step B, its end stays at the interface between the external adapters A and B, releasing the mechanical connection of the external adapters A and B; An O-ring is fitted on the inner groove of the second locking / unlocking pin head, and the O-ring forms an interference fit with the inner wall of the pin through hole A / B.

7. The self-stabilizing quick-folding and quick-deploying support frame as described in claim 6, characterized in that, The second locking / unlocking pin has a second threaded hole on its pin head ring surface, which is connected to the second limiting groove on the side wall of the pin through hole A / B by a limiting screw, in order to limit the movement range of the second locking / unlocking pin.

8. The self-stabilizing quick-folding and quick-deploying support frame as described in claim 6, characterized in that, The inner stepped surface of the external adapter A / B forms a relief arc surface, which is recessed inward with reference to the bottom surface of the adapter; The end of the second locking / unlocking pin has a hemispherical design; The outer side of the second locking / unlocking pin is marked with locking and unlocking indicators respectively.

9. The self-stabilizing quick-folding and quick-deploying support frame as described in claim 2, characterized in that, The inner corner includes an inner connector C and an inner connector D. Connecting grooves are provided on the middle side of the inner connector C and the top side of the inner connector D. The connecting grooves are embedded with complementary hinged semi-columns with semi-column hinge holes. By embedding the side curved surface of the front hinged semi-column into the connecting groove of the inner connector D and simultaneously embedding the side curved surface of the rear hinged semi-column into the connecting groove of the inner connector C, the front and rear hinged semi-columns are coaxially connected by flat round head semi-hollow rivets. The free end of the internal adapter C / D adopts a standardized interface design for splicing and installation with the frame unit; One side of the pressing hole on the inner adapter C extends through the side surface of the inner adapter C. The pressing buckle is hinged in the pressing hole by a pin. The outer end of the pressing buckle is a buckle end with a chamfer, and the inner end is a pressing end. The pressing end is provided with a buckle unlocking mark. The top of the inner adapter D is equipped with a chamfered retaining clip, and the chamfered surfaces of the retaining clip and the pressing clip are arranged in a relatively opposite manner.

10. The self-stabilizing quick-folding and quick-deploying support frame as described in claim 9, characterized in that, The mechanical linkage system of the press buckle consists of a spring connecting rod and a compression spring. One end of the compression spring is fixed to the spring connecting rod, and the other end is connected to the rear wall of the press buckle near the pressing end. The press buckle is kept in a normally closed state by the pre-tightening force of the compression spring. When an external force is applied, the press buckle is driven to rotate around the pin to unlock.

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