Quadrangular deployable space truss structure

Abstract

The invention provides a quadrangular deployable space truss structure which comprises polyhedral joints, connecting pieces, truss rods, stay cables and transverse rod joints, the truss rods are connected with the polyhedral joints through the connecting pieces and fixed through flat-end groove pins, and a rotating joint is arranged in the middle of a transverse rod of each periodic unit, so that a truss can be freely unfolded and contracted; and the stay cables are hooked on the polyhedral joints through the hooks, so that the overall stability of the truss structure is ensured. The large space expandable truss structure has the advantages of being beneficial to expansion and contraction of the structure, flexible in adjustment and convenient to mount and dismount, assembly of the large space expandable truss structure is facilitated, and flexibility of space tasks is greatly improved.

Description

Technical Field

[0001] The invention belongs to the field of aerospace technology, and in particular relates to a quadrangular prism-type deployable space truss structure. Background Art

[0002] With the rapid development of aerospace technology, the demand for large space structures is becoming increasingly diversified, especially in the fields of satellite communications, space station construction and deep space exploration, which put forward higher requirements for lightweight, high load-bearing and easy deployment of structures. It is particularly important to develop a space truss structure that can be efficiently expanded and retracted. Therefore, a quadrangular prism-type deployable space truss structure is invented, which can be quickly deployed in a space environment to form a stable working platform, and has the characteristics of light weight and high strength, which greatly improves the reliability of space missions. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a quadrangular prism-type expandable space truss structure, which greatly improves the flexibility of large space trusses and can quickly expand and contract the space truss structure, providing reliable technical support for the design of large space structures and on-track assembled truss structures, and has important practical value and broad application prospects.

[0004] The present invention provides a quadrangular prism-type expandable space truss structure, which includes polyhedral joints, connectors, truss rods, inclined cables, and crossbar joints. The polyhedral joints, connectors, and crossbar joints are all prefabricated. The polyhedral joints include joints in multiple directions. The truss rods include transverse truss rods and longitudinal truss rods. A plurality of polyhedral joints are connected by transverse truss rods, longitudinal truss rods, and inclined cables to form an overall truss structure.

[0005] The transverse truss rod is composed of two rod sections connected by a crossbar joint, and the outer ends of the rod sections are connected to the polyhedron joints through connecting pieces.

[0006] The crossbar joint includes a rotating joint, a rotating joint tail, a spring, and a clamp, wherein the rotating joint includes a slotted rotating joint and a hole rotating joint that are matched and connected, and the slotted rotating joint and the hole rotating joint are both hollow structures with a disc on the top; a semi-cylindrical groove is opened inside the slotted rotating joint, a spring and a clamp are placed in the groove and the groove mouth is pressed against by the rotating joint tail, a rectangular groove is opened in the middle of the groove, and protrusions extending out of the rectangular groove are arranged on both sides of the clamp, a hole is opened in the center and bottom of the top disc of the slotted rotating joint, the hole in the center of the disc is connected to the hole rotating joint by a flat-headed slot pin, and the bottom of the rotating joint is connected to the transverse truss rod by a flat-headed slot pin; a hole is opened in the center and bottom of the top disc of the hole rotating joint, the slotted rotating joint is connected by the center of the disc, and the bottom is connected to the transverse truss rod, and a fixing hole is opened on the side of the top disc of the hole rotating joint, and after the truss is unfolded, the clamp is inserted into the fixing hole to lock the rotating joint.

[0007] Preferably, the polyhedral joint includes joints in multiple directions, and the joints have three forms, including concave joints, cylindrical joints and flat joints. The concave joints are connected to the transverse truss rods through connecting pieces, the cylindrical joints are connected to the longitudinal truss rods and are fixed by flat-head groove pins, and the flat joints are used to connect the diagonal cables.

[0008] Preferably, the connecting member comprises two first connecting holes, wherein the two ends of the connecting member are cylindrical and flat respectively, the cylindrical end has a connecting hole in the middle for connecting to the transverse truss rod, and the flat end has a connecting hole in the middle for connecting to the concave joint of the polyhedral joint.

[0009] Preferably, the truss rod comprises two second connection holes, wherein one end of the transverse truss rod is used to be connected to the polyhedron joint through a connecting piece, and the other end is used to be connected to the crossbar joint, and both ends of the longitudinal truss rod are connected to the polyhedron joint.

[0010] Preferably, the inclined cable is an elastic rope, and a hook is provided at each end of the elastic rope for connecting to the flat joint of the polyhedral joint.

[0011] Compared with the prior art, the present invention has the following beneficial effects: The present invention is a four-prism type expandable space truss structure. After the entire truss is assembled, the entire truss can be gradually expanded through external excitation. After being fully expanded, the clamps in the crossbar joints will be automatically locked to ensure the stability of the truss structure. When shrinking, the spring inside the crossbar joint is compressed by pressing the clamps, so that the crossbar can rotate around the crossbar joint to shrink the entire truss.

[0012] The present invention greatly improves the flexibility of large-scale space trusses, can quickly expand and contract space truss structures, provides reliable technical support for the design of large-scale space structures and on-track assembled truss structures, and has important practical value and broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 The invention discloses a quadrangular prism-type expandable space truss structure.

[0015] Figure 2 Schematic diagram of the polyhedron joint of the present invention.

[0016] Figure 3 It is a schematic diagram of a connecting piece of the present invention.

[0017] Figure 4 It is a schematic diagram of a truss rod of the present invention.

[0018] Figure 5 It is a schematic diagram of the inclined cable of the present invention.

[0019] Figure 6 It is a schematic diagram of the crossbar joint of the present invention.

[0020] Figure 7 It is a side view of the crossbar joint axis of the present invention.

[0021] Figure 8 It is a schematic diagram of the structure of the slotted rotary joint in the crossbar joint of the present invention.

[0022] Fig. 9 It is a schematic diagram of the structure of the rotary joint with a hole in the crossbar joint of the present invention.

[0023] Fig.10 It is a schematic diagram of a single periodic unit truss structure of the present invention.

[0024] Fig.11 It is a schematic diagram of the contraction and expansion of a quadrangular prism-type expandable space truss structure of the present invention. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments, and the above and / or other advantages of the present invention will become clearer. 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.

[0026] The present invention provides a quadrangular prism-type deployable space truss structure, such as Figure 1 and 10 As shown, it includes a polyhedron joint 1, a connecting piece 2, a truss rod 3, a cable 4, and a crossbar joint 5. The polyhedron joint 1, the connecting piece 2, and the crossbar joint 5 are all prefabricated. Figure 2 As shown, it includes joints in multiple directions, connecting the inclined cable 4 and connecting the truss rod 3 through the connecting member 2. The connecting member 2 is as shown in FIG. Figure 3 As shown, it comprises two first connection holes 6 for connecting the joint of the polyhedral joint with the truss rod 3. The truss rod 3 is as shown in FIG. Figure 4As shown, it includes two second connecting holes 7, the two ends of the transverse truss rod are respectively connected to the connecting piece 2 and the cross bar joint 5, and the two ends of the longitudinal truss rod are connected to the polyhedron joint 1. The cross bar joint 5 includes a rotating joint 8, a rotating joint tail 9, a spring 10, a clamp 11, a rotating joint groove 12 and a fixing hole 13, which are used to lock and unlock the entire joint.

[0027] The rotating joint 8 is connected and fixed by a flat-headed slot pin 14, the longitudinal truss rod and the polyhedron joint 1 are connected and fixed by a flat-headed slot pin 14, and the transverse truss rod and the polyhedron joint 1 are connected and fixed by a connecting piece 2 and a flat-headed slot pin 14, wherein the middle of the transverse truss rod is connected by a cross bar joint 5 and is connected and fixed by a flat-headed slot pin 14, wherein the transverse truss rod can rotate around the cross bar joint 5, and in order to expand and contract the entire truss structure, the inclined cable 4 is hooked on the joint of the polyhedron joint by a hook 15 to ensure the overall stability of the truss structure, and the above steps are repeated to complete the installation of the expandable space truss.

[0028] The polyhedral joint 1 is as Figure 2 As shown, it includes joints in multiple directions, and there are three types of joints. The concave joint 16 has a hole in the middle part, which is connected to the transverse truss rod through the connecting piece 2, and the connecting piece 2 can rotate around the center of the hole of the concave joint. The cylindrical joint 17 has a hole in the middle part to connect with the longitudinal truss rod to ensure the stability of the rod. The flat joint 17 has a hole in the middle part for connecting the oblique cable 4.

[0029] The connecting member 2 is as follows Figure 3 As shown, it includes two first connecting holes 6, wherein the two ends of the connecting piece are cylindrical and flat respectively, a connecting hole is opened in the middle of the cylindrical end to connect the transverse truss rod, and a connecting hole is opened in the middle of the flat end to connect the concave joint 16 of the polyhedron joint 1, which is used to rotate the transverse truss rod so that the transverse truss rod can be folded and stretched in a plane at 45 degrees from the longitudinal truss rod, which is convenient for the contraction and expansion of the truss structure, which not only enables the truss structure to be reliably expanded, but also ensures its stability, wherein the connecting holes are fixed with flat-headed slot pins 14.

[0030] The truss rod 3 is as follows Figure 4 As shown, there are three forms including longitudinal truss rods and transverse truss rods of two lengths, each truss rod has a second connecting hole 7 at both ends, wherein one end of the transverse truss rod is connected to the polyhedron joint through the connecting piece 2, and the other end is connected to the cross bar joint 5, the longer transverse truss rod is connected to the open hole rotation joint, and the shorter transverse truss rod is connected to the slotted rotation joint, ensuring that the center of the middle circular hole of the cross bar joint is at the same distance from the polyhedron joint 1 at both ends, both ends of the longitudinal truss rod are connected to the polyhedron joint 1, each periodic unit has four longitudinal truss rods and eight transverse truss rods, when the truss is contracted and expanded, the transverse truss rod will rotate at the connection, which is convenient for the expansion and contraction of the truss structure.

[0031] The inclined cable 4 is as follows Figure 5 As shown, it is an elastic rope, and a hook 15 is provided at each end of the elastic rope. The hooks 15 at both ends of the elastic rope hook the connecting holes of the flat joint 18 of the polyhedral joint 1, wherein the elastic rope has a certain elasticity and can provide a certain pre-tightening force when connected in the truss to ensure the overall stability of the entire space truss.

[0032] The crossbar joint 5 is as Figure 6-9 As shown, it includes a rotary joint 8, a rotary joint tail 9, a spring 10, and a clamp 11. The spring 10 is placed in a groove 12 of the rotary joint 8, and the clamp 11 is placed on the top of the spring 10. The spring 10 provides a certain force to make the clamp 11 have a tendency to move upward. When a certain force is applied, the clamp 11 can slide in the groove 12 to form the locking and unlocking of the crossbar joint 5. At the same time, the rotary joints 8 are connected and fixed by a flat head groove pin 14 to ensure the integrity of the crossbar joint.

[0033] The rotary joint 8 includes two parts: a slotted rotary joint and a holed rotary joint, wherein semi-cylindrical grooves are respectively opened inside the slotted rotary joint for placing a spring 10 and a clamp 11, and are supported by the rotary joint tail 9. The rotary joint tail has a protrusion. After a part of it is placed in the slotted rotary joint, it is rotated at a certain angle so that the protrusion matches the internal groove of the slotted rotary joint for fixation. A narrower rectangular groove is opened in the middle of the groove for extending out both sides of the clamp 11. A hole is opened in the center and bottom of the top disk of the slotted rotary joint, and the holed rotary joint is connected to the holed rotary joint through a flat-headed slot pin 14 at the center of the disk. The rotary joint tail 9 at the bottom is connected to the transverse truss rod through the flat-headed slot pin 14. A hole is opened in the center and bottom of the top disk of the holed rotary joint, and the slotted rotary joint is connected through the center of the disk. The bottom is connected to the transverse truss rod. A fixing hole 13 is opened on the side of the top disk of the holed rotary joint. After the truss is unfolded, the clamp 11 is inserted into the fixing hole 13 to lock the rotary joint 8.

[0034] like Fig.11 As shown, when the truss structure is unfolded, the transverse truss rods are unfolded outward in a plane that forms an angle of 45 degrees with the longitudinal truss rods, and they can rotate at the crossbar joint 5. When fully unfolded, the clamp 11 will be pushed into the fixing hole 13 under the action of the spring 10, thereby locking the crossbar joint. When the truss structure is contracted, the clamp 11 is pressed to completely leave the fixing hole 13 and rotate the crossbar joint 5, so that the transverse truss rods are folded inward in a plane that forms an angle of 45 degrees with the longitudinal truss rods, and the truss structure is contracted until it is fully contracted.

[0035] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device embodiment, the above is only a preferred embodiment of the present invention. Since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field is within the technical scope disclosed by the present invention. For ordinary technicians in the technical field, changes or replacements that can be easily thought of should be covered within the protection scope of the present invention without departing from the principle of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A quadrangular prism-type expandable space truss structure, comprising a polyhedral joint (1), a connecting piece (2), a truss rod (3), a diagonal cable (4), and a crossbar joint (5), wherein the polyhedral joint (1), the connecting piece (2), and the crossbar joint (5) are all prefabricated, the polyhedral joint (1) comprises joints in multiple directions, the truss rod (3) comprises a transverse truss rod and a longitudinal truss rod, and a plurality of polyhedral joints (1) are connected to form an overall truss structure through the transverse truss rod, the longitudinal truss rod, and the diagonal cable (4); characterized in that: The transverse truss rod is composed of two rod sections connected by a transverse rod joint (5), and the outer ends of the rod sections are connected to the polyhedral joints (1) via connecting pieces (2). The crossbar joint (5) comprises a rotary joint (8), a rotary joint tail (9), a spring (10), and a clamp (11), wherein the rotary joint (8) comprises a slotted rotary joint and a holed rotary joint that are matched and connected, and both the slotted rotary joint and the holed rotary joint are hollow structures with a disk on the top; the slotted rotary joint has a semi-cylindrical groove inside, the spring (10) and the clamp (11) are placed in the groove and are pressed against the groove mouth through the rotary joint tail (9), a rectangular groove is opened in the middle of the groove, and protruding rectangular grooves are arranged on both sides of the clamp (11). A protrusion is formed on the top disk of the slotted rotary joint, and a hole is formed at the center and bottom of the top disk of the slotted rotary joint. The hole at the center of the disk is connected to the hole-opening rotary joint through a flat-headed slot pin (14). The tail of the rotary joint at the bottom (9) is connected to the transverse truss rod through a flat-headed slot pin (14). A hole is formed at the center and bottom of the top disk of the slotted rotary joint, and the slotted rotary joint is connected through the center of the disk. The bottom is connected to the transverse truss rod. A fixing hole (13) is formed on the side of the top disk of the slotted rotary joint. After the truss is unfolded, the clamp (11) is clamped into the fixing hole (13) to lock the rotary joint (8).

2. The quadrangular prism-type deployable space truss structure according to claim 1, characterized in that: The polyhedral joint (1) comprises joints in multiple directions. The joints are of three types, including a concave joint (16), a cylindrical joint (17) and a flat joint (18). The concave joint (16) is connected to the transverse truss rod through a connecting piece (2), the cylindrical joint (17) is connected to the longitudinal truss rod and fixed by a flat-headed slot pin, and the flat joint (18) is used to connect the oblique cable (4).

3. The quadrangular prism-type deployable space truss structure according to claim 2, characterized in that: The connecting piece (2) comprises two connecting holes (6), wherein the two ends of the connecting piece are cylindrical and flat respectively, the cylindrical end has a connecting hole in the middle for connecting to the transverse truss rod, and the flat end has a connecting hole in the middle for connecting to the concave joint (16) of the polyhedral joint (1).

4. The quadrangular prism-type deployable space truss structure according to claim 1, characterized in that: The truss rod (3) comprises two connection holes (7), wherein one end of the transverse truss rod is used to be connected to the polyhedron joint (1) via a connection piece (2), and the other end is used to be connected to the crossbar joint (5), and both ends of the longitudinal truss rod are connected to the polyhedron joint.

5. The quadrangular prism-type deployable space truss structure according to claim 2, characterized in that: The inclined cable (4) is an elastic rope, and a hook (15) is provided at each end of the elastic rope for connecting to a flat joint (18) of the polyhedral joint (1).

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