Foldable tent truss

Abstract

A foldable tent truss comprises a folding and unfolding mechanism, and the folding and unfolding mechanism comprises a foldable movable mechanism formed by combining one or more folding and unfolding units. Each folding and unfolding unit comprises four folding and unfolding surfaces and four carbon fiber rods among the four folding and unfolding surfaces; each folding and unfolding surface is formed by combining a group of two folding and unfolding assemblies and two carbon fiber rods; each folding and unfolding assembly comprises two carbon fiber rods, a rotary hinge and two self-locking hinges. The foldable tent truss provided by the invention can be self-locked, has higher rigidity and larger folding-unfolding ratio, and is convenient to process, manufacture and mount. The expandable mechanism with the large folding-unfolding ratio is reasonable in structural design and convenient to machine and manufacture, and the structure of the expandable mechanism is perpendicular to the folding-unfolding direction.

Description

Technical Field

[0001] The invention relates to a foldable tent truss. Background Art

[0002] As one of the important equipment for outdoor activities, tents have the characteristics of diversified structural design, rich functionality, good portability and durability. At present, disaster relief tents are mainly used in disaster scenes such as earthquakes, floods, and house collapses.

[0003] However, traditional earthquake relief tents contain a large number of metal frames, connectors and fixings, and their components need to be carefully classified during the construction and disassembly process, making the construction and disassembly of disaster relief tents cumbersome and time-consuming, increasing the complexity and time cost of construction and disassembly. The large number of components also increases the overall weight of the disaster relief tent, which is not conducive to rapid transportation and transfer. Secondly, disaster relief tents composed of multiple single parts require multiple steps and tools to cooperate during the construction and disassembly process, and each step requires precise operation to ensure the stability of the structure. The construction and disassembly operations are difficult and require high skills from technical operators. In addition, traditional disaster relief tents are often limited in space design and difficult to expand rapidly. With the deepening of disaster relief work, the demand for temporary housing often exceeds expectations, and traditional disaster relief tents are insufficient in scalability.

[0004] At present, disaster relief tents on the market have problems such as low assembly efficiency, complex structure, limited single-unit space, and difficulty in meeting the needs of rapid expansion. As the use environment becomes more and more complex, the market urgently needs a new type of disaster relief tent that integrates efficient assembly, low technical requirements, and modular expansion. The innovative connection mechanism simplifies the construction and disassembly process, allowing it to be completed in a short time. At the same time, it has a flexible modular design, which can quickly increase or decrease units according to actual needs, realize dynamic adjustment and expansion of space, and cope with disaster relief tasks of different scales. Summary of the invention

[0005] The purpose of the present invention is to provide a foldable tent truss which is self-locking, has high rigidity, has a large folding and unfolding ratio, is easy to process and manufacture, and is easy to install. In particular, it is a large folding and unfolding ratio deployable mechanism with reasonable structural design, easy to process and manufacture, and a structure arranged perpendicular to the folding and unfolding direction.

[0006] A foldable tent truss comprises a folding mechanism, wherein the folding mechanism comprises a foldable movable mechanism composed of one or more folding units; each folding unit comprises four folding surfaces and four carbon fiber rods between the four folding surfaces; each folding surface comprises a group of two folding components and two carbon fiber rods; each folding component comprises two carbon fiber rods, a swivel hinge and two self-locking hinges.

[0007] Preferably, a self-locking hinge can provide a perpendicular rotating pair, a cable portion is located on the inner right-angled side of the self-locking hinge, hinge guides or hinge bosses are located on the two outer right-angled sides of the self-locking hinge, and the self-locking hinge on the same folding unit can only have one of the hinge guides or hinge bosses.

[0008] Preferably, when the folding and unfolding mechanism has only one folding and unfolding unit, after the folding and unfolding unit is manually unfolded, four universal rotating rings are inserted into the latches of four self-locking hinges at the top, and the installation is completed after rotation and locking.

[0009] Preferably, when there are multiple folding units in the folding and unfolding mechanism, all the folding and unfolding units need to be manually unfolded, and then the universal rotating ring is installed on the self-locking hinge, and the folding unit with the hinge boss is inserted from top to bottom into the hinge guide rail of the folding unit with the hinge guide rail to complete the assembly of two or more folding units, thereby forming a large folding and unfolding mechanism.

[0010] Preferably, the self-locking hinge of the present invention includes a folding hinge joint arranged in an L shape, and each arm of the folding hinge joint is respectively provided with a first step sliding pin ear, a first flat head grooved pin shaft, a first spring, a first spring pin, a first step sliding pin, a cam connector, a first retaining spring, and a first semi-circular head hexagon socket bolt, the spring pin is inserted into the spring, one end of the spring pin is fixed to the body of the folding hinge joint, and the other end is matched with the step sliding pin; the cam connector located on the side of the step sliding pin away from the spring pin is connected to the folding hinge joint through a flat head grooved pin shaft; the step sliding pin ear is fitted with the side of the folding hinge joint for locking the movement of the step sliding pin; the step sliding pin is connected to the step sliding pin ear through a semi-circular head hexagon socket bolt; and a retaining spring is provided in the notch of the flat head grooved pin shaft.

[0011] Preferably, a fixing ring is arranged at the lower part of the folding hinge joint of the present invention, a hinge boss or a hinge guide rail is arranged at the side wall of the folding hinge joint, and a latch base is arranged inside the folding hinge joint.

[0012] Preferably, the swivel hinge of the present invention includes a single-ear swivel hinge, a double-ear swivel hinge, a second spring, a second step sliding pin, a second flat-headed grooved pin, a second retaining spring, a second step sliding pin ear, a second spring pin, and a semi-circular head hexagon socket bolt. The single-ear swivel hinge and the double-ear swivel hinge are hingedly connected by a second flat-headed grooved pin, and second retaining springs are respectively arranged at both ends of the length direction of the second flat-headed grooved pin; the second spring is inserted into the double-ear swivel hinge through the second spring pin, and the second step sliding pin matching the second spring is located inside the double-ear swivel hinge, and second step sliding pin ears are arranged at both ends of the length direction of the second step sliding pin; and a guide groove matching the second step sliding pin is provided on the double-ear swivel hinge.

[0013] Preferably, the universal rotating lifting ring of the present invention comprises a rotating nut, a latch fixing shaft, a die-cast fixing part, a hexagonal thin nut, a third spring, a spring shaft, and a lifting ring. The lifting ring is fixed to the die-cast fixing part, the latch fixing shaft is inserted into the die-cast fixing part, the latch fixing shaft and the rotating nut are sequentially positioned in the die-cast fixing part, the hexagonal thin nut is threadedly connected to the latch fixing shaft, the spring shaft is inserted into the third spring, and together with the latch fixing shaft; the spring shaft corresponds to the hole of the latch base on the self-locking hinge.

[0014] The present invention can design its rod length according to different needs of disaster relief environments and can adapt to different folding and unfolding lengths. The rectangular foldable disaster relief tent truss of the present invention has a large folding and unfolding ratio, a compact folding structure, a smooth unfolding process and no interference between the rods and hinges; it has strong structural rigidity after being fully unfolded, and the entire folding and unfolding mechanism can complete the locking action after being fully unfolded. Compared with the prior art, the rectangular foldable disaster relief tent truss of the present invention has locking mechanisms on both the self-locking hinges and the swivel hinges, which makes the structure more stable and solves the shaking problem caused by insufficient locking ability in previous technologies; the hinge guide rails and hinge bosses of the present invention can enable multiple folding and unfolding units to be spliced ​​into a large disaster relief tent. Compared with the prior art, the tent can solve the shortcomings of traditional tents in expansibility; and the present invention can be manually unlocked, which can solve the problems of non-recyclability and non-secondary folding and unfolding.

[0015] The present invention is a foldable disaster relief tent truss with simple structure, light weight, large unfolding rigidity and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the unfolding of the self-locking hinge of the main working module of the preferred embodiment of the present invention.

[0017] Figure 2 It is a schematic diagram of the closing of the self-locking hinge (hinge guide) of the main working module of the preferred embodiment of the present invention.

[0018] Figure 3 It is a schematic diagram of the closing of the self-locking hinge (hinge boss) of the main working module of the preferred embodiment of the present invention.

[0019] Figure 4 It is a schematic diagram of the closure of the self-locking hinge at the bottom of the main working module of the preferred embodiment of the present invention.

[0020] Figure 5 It is a schematic diagram of the self-locking hinge connection at the top and bottom of the main working module of a preferred embodiment of the present invention.

[0021] Figure 6 It is an exploded view of the universal rotating ring of the main working module of the preferred embodiment of the present invention.

[0022] Figure 7It is a schematic diagram of the universal rotating hinge inserted into the self-locking hinge of the main working module of the preferred embodiment of the present invention.

[0023] Figure 8 It is an overall schematic diagram of the swivel hinge of the main working module of a preferred embodiment of the present invention.

[0024] Fig. 9 It is a schematic side view of the closure of the rotary hinge of the main working module of the preferred embodiment of the present invention.

[0025] Fig.10 It is a schematic side view of the unfolding of the rotary hinge of the main working module of a preferred embodiment of the present invention.

[0026] Fig.11 It is a schematic diagram of the overall expansion of a single unit of a preferred example prototype of the present invention.

[0027] Fig.12 It is a semi-expanded schematic diagram of a single unit of a preferred example prototype of the present invention.

[0028] Fig.13 It is a schematic diagram of the overall closure of a single unit of a preferred example prototype of the present invention.

[0029] Fig.14 It is a schematic diagram of the deployment of a single unit of a preferred example prototype of the present invention, which is integrally covered with a wind-resistant rope.

[0030] Fig.15 It is a schematic diagram of the overall expansion of multiple units of a preferred example prototype of the present invention.

[0031] Fig.16 It is a schematic diagram of the overall closure of multiple units of a preferred example prototype of the present invention. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] like Figure 11-16 A foldable tent truss includes a folding mechanism, wherein the folding mechanism includes a foldable movable mechanism composed of one or more folding units; each folding unit includes four folding surfaces and four carbon fiber rods between the four folding surfaces; each folding surface includes a group of two folding components and two carbon fiber rods; each folding component includes two carbon fiber rods, a swivel hinge and two self-locking hinges.

[0034] A self-locking hinge can provide a perpendicular rotation pair. There is a cable section on the inner right-angled side of the self-locking hinge, and there are hinge guides or hinge bosses on the two outer right-angled sides of the self-locking hinge. The self-locking hinge on the same folding unit can only have one of the hinge guides or hinge bosses.

[0035] When the folding and unfolding mechanism has only one folding and unfolding unit, after the folding and unfolding unit is manually unfolded, four universal rotating rings are inserted into the latches of four self-locking hinges at the top, and the installation is completed after rotation and locking.

[0036] When there are multiple folding units in the folding and unfolding mechanism, all folding and unfolding units need to be unfolded manually. After that, the universal rotating ring is installed on the self-locking hinge, and the folding and unfolding unit with the hinge boss is inserted from top to bottom into the hinge guide of the folding and unfolding unit with the hinge guide to complete the assembly of two or more folding and unfolding units, thereby forming a large folding and unfolding mechanism.

[0037] like Figure 1-Figure 3 As shown, the self-locking hinge of the present invention comprises an L-shaped folding hinge joint 101, on each arm of the folding hinge joint 101 are respectively provided with a first step sliding pin ear 104, a first flat head grooved pin shaft 105, a first spring 103, a first spring pin 102, a first step sliding pin 109, a cam connector 106, a first retaining spring 107, and a first semicircular head hexagon socket bolt, the first spring pin 102 is inserted into the first spring 103, one end of the first spring pin 102 is connected to the main body of the folding hinge joint 101 The body is fixed, and the other end cooperates with the first step sliding pin 109; the cam connector 106 located on the side of the first step sliding pin 109 away from the first spring pin 102 is connected to the folding hinge joint 101 through a flat head grooved pin shaft 105; the step sliding pin ear 104 fits with the side of the folding hinge joint 101 to lock the movement of the step sliding pin; the first step sliding pin 109 is connected to the step sliding pin ear 104 by a semicircular head hexagon socket bolt; the first retaining spring 107 is set in the notch of the first flat head grooved pin shaft 105.

[0038] like Figure 1-Figure 3 As shown, a fixing ring 108 is disposed at the lower part of the folding hinge joint 101, a hinge boss 116 or a hinge guide rail 113 is disposed on the side wall of the folding hinge joint 101, and a latch base 111 is disposed inside the folding hinge joint (101).

[0039] Figure 4 Shows the bottom self-locking hinge closed. Figure 5 A schematic diagram showing the two sets of connection states when the top and bottom self-locking hinges are closed.

[0040] like Figure 8-Figure 10The swivel hinge of the present invention comprises a single-ear swivel hinge 205, a double-ear swivel hinge 202, a second spring 206, a second step sliding pin 204, a second flat head grooved pin shaft 207, a second retaining spring 208, a second step sliding pin ear 203, a second spring pin 201, and a hexagon socket head bolt. The single-ear swivel hinge 205 and the double-ear swivel hinge 202 are hingedly connected by a second flat head grooved pin shaft 207. The second flat head grooved pin shaft 207 Second retaining springs 208 are arranged at both ends in the length direction; the second spring 206 is inserted into the double-ear swing hinge 202 through the second spring pin 201, and the second step sliding pin 204 matched with the second spring 206 is located inside the double-ear swing hinge 202, and second step sliding pin ears 203 are arranged at both ends in the length direction of the second step sliding pin 204; a guide groove 209 matching the second step sliding pin 204 is provided on the double-ear swing hinge 202.

[0041] like Figure 5 , Figure 6 The universal rotating lifting ring of the present invention includes a rotating nut 117, a latch fixing shaft 118, a die-casting fixing piece 119, a hexagonal thin nut 120, a third spring 121, a spring shaft 122, and a lifting ring 123. The lifting ring 123 is fixed to the die-casting fixing piece 119. The latch fixing shaft 118 is inserted into the die-casting fixing piece 119. The latch fixing shaft 118 and the rotating nut 117 are sequentially positioned in the die-casting fixing piece 119. The hexagonal thin nut 120 is threadedly connected to the latch fixing shaft 118. The spring shaft 122 is inserted into the third spring 121 and together with the latch fixing shaft 118. The spring shaft 122 corresponds to the hole of the latch base 111 on the self-locking hinge.

[0042] Reference Figure 1 , Figure 2 and Figure 3 The present invention provides a schematic diagram of the overall and lateral expansion and closing of the self-locking hinge (hinge guide) (hinge boss) of the main working module.

[0043] The self-locking hinge of the present invention is composed of a folding and unfolding hinge joint 101, a first cam connector 106, a first spring 103, a first step sliding pin 109, a first flat head grooved pin shaft 105, a first retaining spring 107, a first step sliding pin ear 104, a first spring pin 102, a first semicircular head hexagon socket bolt, a semicircular head cross screw 110, and a pin base 111. When fully unfolded, the first spring 103 can push the first step sliding pin 109 to the concave part of the cam connector to complete self-locking. The first spring pin 102 arranged in the middle of the first spring 103 enables the spring 103 to achieve a single-direction elastic force. After fully unfolded, the force of the first spring 103 on the first step sliding pin 109 realizes the lateral locking of the first step sliding pin 109, and the guide groove 112 longitudinally locks the first step sliding pin 109, thereby realizing the locking of the self-locking hinge.

[0044] Reference Figure 4 , the present invention provides an exploded diagram of the universal rotating ring of the main working module.

[0045] The universal rotating lifting ring is composed of a rotating nut 117, a latch fixing shaft 118, a die-cast fixing part 119, a hexagonal thin nut 120, a third spring 121, a spring shaft 122, and a lifting ring 123. After being inserted into and fixed on the latch base of the self-locking hinge, the lifting ring 123 can rotate 360 ​​degrees, and can be used to fix the tent cloth part in cooperation with the fixing ring 108 of the self-locking hinge.

[0046] Reference Figure 5 , Figure 6 and Figure 7 The present invention provides a schematic diagram of the overall and side expansion and closing of the rotary hinge of the main working module.

[0047] The swivel hinge is composed of a single-ear swivel hinge 205, a double-ear swivel hinge 202, a second spring 206, a second step pin 204, a second flat-headed slotted pin 207, a second retaining ring 208, a second step pin ear 203, a second spring pin 201, and a hexagon socket bolt. When fully extended, the cam squeezes the second step pin 204 to the top of the cam, and then the second spring 206 pushes the second step pin 204 to the concave part of the cam to complete self-locking. After fully extended, the second spring 206 exerts a force on the second step pin 204 to achieve lateral locking of the second step pin 204, and the guide groove 209 longitudinally locks the second step pin 204, thereby achieving locking of the swivel hinge; the second spring pin 201 arranged in the middle of the second spring 206 enables the second spring 206 to achieve a single-direction elastic force.

[0048] The foldable tent truss of the present invention is installed in the following steps:

[0049] Step 1, place the first step sliding pin 109 in the guide groove 112 of the folding hinge joint 101, combine the first spring pin 102 with the thread of the first step sliding pin 109, put on the first spring 103, put the other end into the guide channel, put the pin base 111 on the top, fix it with four semicircular head cross screws 110, insert the first step sliding pin ear 104 into the first step sliding pin 109, combine the semicircular head hexagon socket bolt with the threads at both ends of the first step sliding pin 109, put in the cam connector 106, insert the first flat head grooved pin shaft 105, combine it with the folding hinge joint 101 and the cam connector 106, finally clamp the first retaining spring 107 on the first flat head grooved pin shaft 105 to complete the assembly of the self-locking hinge.

[0050] Step 2, place the second step sliding pin 204 in the guide groove 209 of the double-ear slewing hinge 202, insert the second step sliding pin ear 203 into the second step sliding pin 204, combine the semicircular head hexagon socket bolt with the thread of the second step sliding pin 204, put in the second spring 206, and then combine the second spring pin 201 with the thread of the second step sliding pin 204 through the guide channel, put in the single-ear slewing hinge 205, insert the second flat head grooved pin shaft 207, combine it with the single-ear slewing hinge 205 and the double-ear slewing hinge 202, and finally clamp the second retaining spring 208 on both ends of the second flat head grooved pin shaft 207 to complete the assembly of the slewing hinge.

[0051] Step 3: Each hinge and connecting rod has pin holes 115 of the same size and distance at both ends. After the positions of the rod and the hinge are determined, the pins are inserted to complete the locking of the folding and unfolding mechanism.

[0052] Step 4, fix the lifting ring 123 to the die-cast fixing part 119, put the latch fixing shaft 118 and the rotating nut 117 into the die-cast fixing part 119 in turn, connect the hexagonal thin nut 120 with the thread of the latch fixing shaft 118, and finally insert the third spring 121 and the spring shaft 122 to complete the universal rotating lifting ring; insert the spring shaft 122 into the corresponding hole of the latch base 111 on the self-locking hinge and rotate it to complete the connection of the universal rotating lifting ring.

[0053] Reference Figure 8 A schematic diagram of the overall expansion of a single unit of a preferred embodiment of the present invention.

[0054] When a single disaster relief tent truss needs to be fully unfolded, it is only necessary to simultaneously pull the two opposite vertical rods 302 at the outermost edge of the folding unit to unfold in opposite directions. When unfolding, the self-locking hinges 304 and the rotary hinges 303 located in the same straight line direction have opposite folding directions. The folding direction of one folding component is the same as that of its adjacent folding component, and opposite to that of another folding component. When the folding mechanism is straightened into a straight line, all hinges in the folding mechanism are locked at the same time. All folding components of the fully unfolded folding mechanism are perpendicular to the folding surface. Finally, the universal rotating ring is rotatably connected to the top of the four self-locking hinges.

[0055] Reference Fig.10 A schematic diagram of the overall expansion of multiple units of a preferred embodiment prototype of the present invention.

[0056] When multiple disaster relief tent trusses need to be combined into a large disaster relief tent truss, the hinge boss 116 only needs to be inserted from top to bottom into the hinge guide rail 113 after it is fully unfolded.

[0057] When the large disaster relief tent truss needs to be disassembled, the hinge boss 116 only needs to be lifted up from the hinge guide rail 113 from the bottom.

[0058] Reference Fig. 9 , Fig.11 Schematic diagram of the overall closure of single and multiple units of the preferred embodiment prototype of the present invention.

[0059] When a single disaster relief tent truss needs to be folded, only one folding assembly needs to be folded each time. When folding the folding assembly, the stepped sliding pin ears of the two self-locking hinges 304 and the swing hinge 303 need to be pushed at the same time to drive the spring pin to move in the opposite direction of the elastic force until the inner concave part of the cam is pushed out, and the relative self-locking hinge 304 is pushed to make the folding assembly form a small amount of folding; in order to prevent the folding assembly from being locked again due to the rigidity of the folding mechanism, the two second and third folding assemblies with the same folding surface as the first folding assembly are folded again in the same way, and finally the fourth folding assembly opposite to the first folding assembly is folded, and after determining that the four folding assemblies are slightly folded, the two unfolded folding surfaces of the same unit are pushed to completely fold the self-locking hinge 304 and the swing hinge 303; the four folding assemblies of the two unfolded folds are folded in the same way, and the last step is changed to pushing the four relative vertical rods until all the folding assemblies are completely folded.

[0060] The invention provides a foldable tent truss, including a swivel hinge, a self-locking hinge and a universal rotating ring, the swivel hinge is located between two opposite self-locking hinges; the self-locking hinge and the swivel hinge are connected by a carbon fiber rod, and the self-locking hinges in the same direction are connected and fixed by a longer carbon fiber rod; the components of the rectangular foldable unit are directly connected by a rotating pair, and the swivel hinge and the self-locking hinge have locking devices, which can further enhance the structural stability of the foldable unit, and the textile cloth part of the tent can be bound by the universal rotating ring and the inclined cable connecting part of the inner side of the self-locking hinge. At the same time, the invention discloses a foldable mechanism that can be spliced ​​and assembled, which is formed by connecting a plurality of the above-mentioned rectangular foldable units through hinge guides and hinge bosses, and each rectangular foldable unit is completely the same except for the hinge guides and hinge bosses, and the structure is symmetrical, and each hinge is locked with a pin between the rod, which is not only convenient for processing and assembly, but also convenient for disassembly and maintenance, and can form a large rectangular foldable tent truss with a large folding rate of any length according to needs, and has strong practicality.

[0061] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A foldable tent truss, characterized in that The invention comprises a folding and unfolding mechanism, wherein the folding and unfolding mechanism comprises a foldable movable mechanism composed of one or more folding and unfolding units; each folding and unfolding unit comprises four folding and unfolding surfaces and four carbon fiber rods between the four folding and unfolding surfaces; each folding and unfolding surface comprises a group of two folding and unfolding components and two carbon fiber rods; each folding and unfolding component comprises two carbon fiber rods, a swivel hinge and two self-locking hinges.

2. The foldable tent truss according to claim 1, characterized in that A self-locking hinge can provide a perpendicular rotation pair. There is a cable section on the inner right-angled side of the self-locking hinge, and there are hinge guides or hinge bosses on the two outer right-angled sides of the self-locking hinge. The self-locking hinge on the same folding unit can only have one of the hinge guides or hinge bosses.

3. The foldable tent truss according to claim 1, characterized in that When the folding and unfolding mechanism has only one folding and unfolding unit, after the folding and unfolding unit is manually unfolded, four universal rotating rings are inserted into the latches of four self-locking hinges at the top, and the installation is completed after rotation and locking.

4. The foldable tent truss according to claim 1, characterized in that When there are multiple folding units in the folding and unfolding mechanism, all folding and unfolding units need to be unfolded manually. After that, the universal rotating ring is installed on the self-locking hinge, and the folding and unfolding unit with the hinge boss is inserted from top to bottom into the hinge guide of the folding and unfolding unit with the hinge guide to complete the assembly of two or more folding and unfolding units, thereby forming a large folding and unfolding mechanism.

5. The foldable tent truss according to claim 1, characterized in that The self-locking hinge comprises an L-shaped folding hinge joint (101), each arm of the folding hinge joint (101) is respectively provided with a first step sliding pin ear (104), a first flat head grooved pin shaft (105), a first spring (103), a first spring pin (102), a first step sliding pin (109), a cam connecting piece (106), a first retaining ring (107), and a first semicircular head hexagon socket bolt; the spring pin (102) is inserted into the spring (103); one end of the spring pin (102) is connected to the folding hinge joint (101); The main body is fixed, and the other end is matched with the step sliding pin (109); the cam connecting piece (106) located on the side of the step sliding pin (109) away from the spring pin (102) is connected to the folding hinge joint (101) through a flat head grooved pin shaft (105); the step sliding pin ear (104) is fitted with the side of the folding hinge joint (101) to lock the movement of the step sliding pin; the step sliding pin (109) and the step sliding pin ear (104) are connected by a semicircular head hexagon socket bolt; and a retaining ring (107) is arranged at the notch of the flat head grooved pin shaft (105).

6. The foldable tent truss according to claim 5, characterized in that A fixing ring (108) is arranged at the lower part of the folding hinge joint (101), a hinge boss (116) or a hinge guide rail (113) is arranged on the side wall of the folding hinge joint (101), and a latch base (111) is arranged inside the folding hinge joint (101).

7. The foldable tent truss according to claim 1, characterized in that The swivel hinge comprises a single-ear swivel hinge (205), a double-ear swivel hinge (202), a second spring (206), a second step sliding pin (204), a second flat-headed slotted pin shaft (207), a second retaining spring (208), a second step sliding pin ear (203), a second spring pin (201), and a hexagon socket head bolt. The single-ear swivel hinge (205) and the double-ear swivel hinge (202) are hingedly connected via a second flat-headed slotted pin shaft (207). The second flat-headed slotted pin shaft (207) is about the same length as the first and second second pins. The second spring (206) is inserted into the double-ear swing hinge (202) through the second spring pin (201); the second step slide pin (204) matched with the second spring (206) is located inside the double-ear swing hinge (202); and the second step slide pin ears (203) are arranged at both ends of the length direction of the second step slide pin (204); and the double-ear swing hinge (202) is provided with a guide rail groove (209) matched with the second step slide pin (204).

8. The foldable tent truss according to claim 6, characterized in that The universal rotating lifting ring comprises a rotating nut (117), a latch fixing shaft (118), a die-casting fixing part (119), a hexagonal thin nut (120), a third spring (121), a spring shaft (122), and a lifting ring (123); the lifting ring (123) is fixed to the die-casting fixing part (119); the latch fixing shaft (118) is inserted into the die-casting fixing part (119); the latch fixing shaft (118) and the rotating nut (117) are sequentially arranged in the die-casting fixing part (119); the hexagonal thin nut (120) is threadedly connected to the latch fixing shaft (118); the spring shaft (122) is inserted into the third spring (121) and is connected to the latch fixing shaft (118); the spring shaft (122) corresponds to a hole of a latch base (111) on the self-locking hinge.

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