CN212951192U - Folding tetrahedron truss unit structure - Google Patents
Folding tetrahedron truss unit structure Download PDFInfo
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- CN212951192U CN212951192U CN202020541795.8U CN202020541795U CN212951192U CN 212951192 U CN212951192 U CN 212951192U CN 202020541795 U CN202020541795 U CN 202020541795U CN 212951192 U CN212951192 U CN 212951192U
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Abstract
The utility model discloses a folding tetrahedron truss unitized construction comprises truss unit and folding subassembly, and the truss unit comprises basic member and joint, and the truss unit can reduce the structure volume and weight reduction, improves and draws in than. When the three foldable single rods of the foldable tetrahedral truss unit are in a folded state, the truss unit is in a contracted state, and a gathering state with a tetrahedral high line taking a joint at the inner side of the bottom as a vertex as a central line is presented, so that the structure is compact, and the space is saved. The three folding tetrahedral truss units and the non-folding single rods with the T-shaped grooves are connected with the molded surfaces at the joints through the central auxiliary connecting piece to form an expandable space structure, and meanwhile, the disassembly can be reversed, so that the truss units or the non-folding single rods with the T-shaped grooves can be replaced, and the operation is simple and convenient. More truss units can be added and assembled by replacing the type of the peripheral joint capable of expanding the space structure, so that the area of the bearing surface is increased.
Description
Technical Field
The utility model relates to a truss design equipment technical field, specifically speaking relates to a folding tetrahedron truss unit structure.
Background
Due to the development of aerospace deep space exploration and the requirement of scientific observation, the large-scale space truss structure assembly technology becomes a research and development hotspot of aerospace institutions in various countries in the world. Due to the limitation of the volume of the rocket fairing and the consideration of risk cost control, the on-orbit assembly becomes a solution for constructing a large-scale space truss structure in the future. By transporting the parts and the extensible basic units, the operation of unfolding, mounting, dismounting, replacing and the like is carried out in the space, and the construction and maintenance tasks of main space facilities such as space solar sailboards, satellite antennas, space cabin supporting trusses and the like are completed. Therefore, the repeatable stretching, simple and reliable truss structure which is easy to install and disassemble becomes the key of the on-rail assembly.
The invention patent 201010800509.7 proposes a tetrahedron folding unit and a space unfolding mechanism, wherein the tetrahedron folding unit comprises two folding plates and two folding rods, one edge of each folding plate is overlapped and hinged with any edge of the other folding plate, the two folding rods are respectively connected with the folding plate hinges, the two folding rods are connected with the folding rod hinges, when the two folding plates are completely overlapped, the two folding plates are in a folding state, and when the two folding rods are positioned on the same straight line, the two folding rods are in a completely unfolded state and are in a stable tetrahedron structure. A plurality of tetrahedron folding units are utilized to expand according to the same direction to form an open-loop component, a plurality of tetrahedron folding units are utilized to expand according to different directions to form a closed-loop component, and the plurality of tetrahedron folding units are connected by overlapping of folding plates to realize the construction of an expandable mechanism. However, the invention has the defects of large volume of the folding plate, low folding ratio and complex assembly and disassembly.
SUMMERY OF THE UTILITY MODEL
In order to avoid the deficiencies of the prior art, the utility model provides a folding tetrahedron truss unit structure.
The utility model adopts the technical proposal that the utility model comprises a truss unit and a folding component, wherein the truss unit consists of three foldable single rods, three non-foldable single rods, a bottom inner side joint, a top joint and two bottom outer side joints, and the folding component comprises a hinge slot, two torsional springs and two bolts; two ends of a single non-foldable rod are respectively hinged and profile connected with the bottom inner side joint and the top joint; two ends of each foldable single rod are respectively hinged with the top joint and the two bottom outer side joints, and two ends of each foldable single rod are respectively hinged with the two bottom outer side joints; the three non-foldable single rods are intersected pairwise relative to the rotating axes of the bottom inner side joints and form an included angle of 60 degrees with each other, and the three non-foldable single rods are kept parallel to a plane formed by the top joint and the two bottom outer side joints; the folding rotation axis of any foldable single-rod body is kept parallel to the relative rotation axis of the connected top joint and the bottom outside joint and is vertical to a plane formed by the central axis of the foldable single-rod and the central axis of the non-foldable single-rod adjacent to the foldable single-rod;
the foldable single rod is formed by connecting two short rods with the same length through a folding assembly, the two short rods are respectively in hinge connection with an H-shaped hinge groove through two bolts, and a torsion spring is sleeved on the bolts and used for limiting the short rods and the hinge groove to rotate relatively;
the bottom inner side joint consists of three hinge joints and a clamping groove cylindrical joint, and four clamping grooves are uniformly distributed at the bottom of the clamping groove cylindrical joint along the circumferential direction;
the top joint consists of a T-shaped plug interface, a hinge interface and a cylindrical interface, the central axes of the two T-shaped plug interfaces form an angle of 60 degrees with each other, and the plane of the central axes is parallel to the plane of the bottom inner side joint and the plane of the two bottom outer side joints;
the bottom outer side joint comprises a T-shaped plug connector, a cylindrical connector and two hinge connectors, the central axes of the two hinge connectors form an angle of 60 degrees, and the plane of the central axis is superposed with the plane formed by the central axes of the three foldable single rods.
The clamping groove cylindrical interface of the inner side joint at the bottom of the truss unit is in molded surface connection with the clamping head of the central auxiliary connecting piece, and the outer side joint at the bottom of the truss unit and the inner side joint at the bottom are positioned on the same plane; the T-shaped grooves at two ends of the non-foldable single rod with the T-shaped grooves are respectively in molded surface connection with the T-shaped plug interfaces of the outer side joints at the bottom of the adjacent truss unit and the top joint of the adjacent truss unit.
Advantageous effects
The utility model provides a pair of folding tetrahedron truss unitized construction comprises truss unit, folding subassembly, and the truss unit comprises basic member and joint, and the truss unit can reduce the structure volume and weight reduction, improves and draws in than. When the three foldable single rods of the foldable tetrahedral truss unit are in a folded state, the truss unit is in a contracted state, and a gathering state with a tetrahedral high line taking a joint at the inner side of the bottom as a vertex as a central line is presented, so that the structure is compact, and the space is saved. The three folding tetrahedral truss units and the non-folding single rods with the T-shaped grooves are connected with the molded surfaces at the joints through the central auxiliary connecting piece to form an expandable space structure, and meanwhile, the folding tetrahedral truss units or the non-folding single rods with the T-shaped grooves can be reversely disassembled to replace the folding tetrahedral truss units or the non-folding single rods with the T-shaped grooves, so that the operation is simple and convenient. More truss units can be added and assembled by replacing the type of the peripheral joint capable of expanding the space structure, so that the area of the bearing surface is increased.
Drawings
The following provides a further detailed description of the structure of the folding tetrahedral truss unit according to the present invention with reference to the accompanying drawings and embodiments.
Fig. 1 is the structural schematic diagram of the folding tetrahedral truss unit of the present invention.
Fig. 2 is a top view of the foldable assembly in the foldable single rod of the present invention.
Fig. 3 is a front view of the folding assembly of the foldable single rod of the present invention.
Fig. 4 is a schematic view of the top joint structure of the present invention.
Fig. 5 is a schematic view of the top connector T-shaped plug interface and hinge interface of the present invention.
Fig. 6 is a schematic view of the top connector cylinder interface of the present invention.
Fig. 7 is a schematic view of the bottom inner side connector clamping groove cylindrical interface of the present invention.
Fig. 8 is a schematic view of the bottom outside joint structure of the present invention.
Fig. 9 is a front view of the expandable space structure of the present invention.
Fig. 10 is a top view of the expandable space structure of the present invention.
Fig. 11 is a schematic structural view of the center auxiliary connecting member of the present invention.
Fig. 12 is a schematic view of the center auxiliary connector chuck structure of the present invention.
Figure 13 is a schematic view of a non-collapsible single rod end T-shaped slot with a T-shaped slot.
In the drawings
1. Non-foldable single rod 2, foldable single rod 3, top joint 4, bottom inside joint 5, bottom outside joint 6, short rod 7, hinge slot 8, torsion spring 9, bolt
Detailed Description
The embodiment is a folding tetrahedral truss unit structure.
Referring to fig. 1 to 13, the present embodiment includes a truss unit composed of three foldable single rods 2, three non-foldable single rods 1, a bottom inside joint 4, a top joint 3, and two bottom outside joints 5, and a folding assembly including a hinge slot 7, two torsion springs 8, and two bolts 9; the top connector 3 comprises two T-shaped plug connectors, two hinge connectors and a cylindrical connector; the central axes of the two T-shaped plug interfaces form an included angle of 60 degrees with each other, and the plane of the central axes is parallel to the plane of the bottom inner side joint 4 and the plane of the two bottom outer side joints 5. The two hinge joints and the cylindrical joint form an included angle of 60 degrees with each other pairwise. The cylindrical interface is a cylindrical hole, and the non-foldable single rod 1 is inserted into the cylindrical hole to form a profile connection, so that the non-foldable single rod 1 is limited to move along the axis of the non-foldable single rod. The bottom inner side joint 4 comprises three hinge joints and a clamping groove cylindrical joint; the three hinge joints form an included angle of 60 degrees with each other, the clamping groove cylindrical joint is coplanar with the two hinge joints, and the three hinge joints form an included angle of 60 degrees with each other. The hinge interface is used for being hinged with the three non-foldable single rods 1, so that the foldable tetrahedron can be conveniently folded towards the center in the folding process. Four clamping grooves are uniformly distributed at the bottom of the clamping groove cylindrical connector along the circumferential direction, and can form a molded surface connection with a clamping head of the central auxiliary connecting piece to limit the relative rotation and movement of the bottom inner side connector 4 relative to the central auxiliary connecting piece. The bottom outer side joint 5 consists of two hinge joints, a cylindrical joint and a T-shaped plug joint; the two hinge interfaces and the cylindrical interface form 60-degree included angles with each other pairwise, the T-shaped plug interface is coplanar with the cylindrical interface and one hinge interface, and the cylindrical interface, the T-shaped plug interface and the coplanar hinge interface form 60-degree included angles. The two hinge interfaces form hinge connection with the foldable single rod 2, and the cylindrical interface forms profile connection with the non-foldable single rod 1 to limit the movement of the non-foldable single rod 1 along the axis.
In this embodiment, the single foldable bar 2 is connected by two short bars 6 of the same length through a folding assembly. The folding component comprises a hinge slot 7, a torsion spring 8 and a bolt 9; the two short rods 6 are respectively hinged with the H-shaped hinge groove 7 through two bolts 9, and torsion springs are sleeved on the bolts and used for limiting the relative rotation of the short rods 6 and the hinge groove 7. The torsion spring 8, the bolt 9, the hole position of the hinge slot 7 and the hole position of the end part of the short rod 6 are in concentric fit, so that the short rod 6 can rotate around the bolt 9 relative to the hinge slot 7. Two torque arms of the torsion spring 8 form 180 degrees with each other, one of the torque arms is in line contact with the inner surface of the bottom of the hinge groove 7, the other torque arm is in line contact with the inner surface of the bottom of the end part of the short rod 6, and the purpose of limiting the short rod 6 to rotate towards the direction of compressing the torsion spring 8 relative to the hinge groove 7 is achieved. The bottom of the hinge slot 7 can limit the short rod 6 to rotate towards the opposite direction, and the stability of the unfolding state of the truss unit is ensured. The axes of the bolts 9 and the hinging axes of the foldable single rods 2, the top joint 3 and the bottom outer side joint 5 are parallel to each other, so that the foldable single rods 2 are always positioned in a plane formed by the adjacent non-foldable short rods 1 in the bundling process of the truss unit.
In this embodiment, the number of the single non-foldable rods 1 is three, the hinge end of each single non-foldable rod 1 is hinged to the hinge interface of the bottom inner side joint, the cylindrical ends of two single non-foldable rods 1 are in profile connection with the cylindrical interface of the bottom outer side joint 5, and the cylindrical end of one single non-foldable rod 1 is in profile connection with the cylindrical interface of the top joint 3. The three non-foldable single rods 1 are hinged with the bottom inner side joint 4, so that the truss unit is guaranteed to be folded towards a high line in a bundling process according to a regular triangular pyramid structure with the bottom inner side joint 5 as a top point and the three non-foldable single rods 1 as side edges. The number of the foldable single rods 2 is three, the hinge ends of two foldable single rods 2 are respectively hinged with the hinge interfaces of the top joints 3, and the hinge end of one foldable single rod 2 is hinged with the hinge interfaces of two bottom outer side joints 5.
When the folding tetrahedral truss unit needs to be bunched, force perpendicular to the bottom surface of the folding tetrahedral truss unit needs to be applied to the hinge slot 7 to overcome the reaction force of the torsion spring, the short rods 6 on the two sides of the hinge slot 7 rotate around the bolts 9 in opposite directions respectively, in the rotating process, the short rods 6 and the two adjacent non-folding single rods 1 are always positioned in a plane formed by the axes of the three rods until the three non-folding single rods are close to the high line of the regular triangular pyramid and cannot be continuously bunched, and the bunching process is completed. When the folding tetrahedral truss unit needs to be unfolded, only the external constraint needs to be removed, and the torsion spring 8 in the folding assembly props the short rods 6 by means of the stored elastic potential energy until the axes of the two short rods 6 are kept parallel to complete the unfolding action.
Assembling the folding tetrahedral truss structure:
connecting the two short rods through a folding assembly to form a foldable single rod;
the bottom inner side joint is used as a base body, and is connected with three non-foldable single rods to form hinge connection with the bottom inner side joint;
the cylindrical joints of the two bottom outside joints are respectively connected with the forming surfaces of the end parts of any two non-foldable single rods, and the cylindrical interface of the top joint is connected with the end part of the other non-foldable single rod to form profile connection;
respectively connecting the foldable single rods with the hinge interfaces of the adjacent joints to form hinge connection, and finishing the assembly of the foldable tetrahedral truss structure
The embodiment also provides an expandable space structure which comprises three folding tetrahedral truss units, a central auxiliary connecting piece and six non-folding single rods with T-shaped grooves. The center auxiliary connecting piece is used as a center, the clamping groove cylindrical interface of the inner side joint at the bottom of each folding tetrahedral truss unit and the clamping head of the center auxiliary connecting piece form molded surface connection, and the outer side joint at the bottom of each folding tetrahedral truss unit and the inner side joint at the bottom are positioned on the same plane. And the T-shaped plugs at two ends of the non-foldable single rod with the T-shaped grooves are respectively in profile connection with the T-shaped plug interfaces of the joints at the outer sides of the bottoms of the adjacent foldable tetrahedral truss units. And the T-shaped plugs at two ends of the non-foldable single rod with the T-shaped grooves are connected with the T-shaped plug interfaces of the top joints of the adjacent foldable tetrahedral truss units to form profile connection. And defining the plane where the bottom outer side joint and the bottom inner side joint of the expandable space structure are located as a bearing surface. Based on the assembly method, more folding tetrahedral truss units can be added and assembled conveniently by replacing the peripheral joint type with an expandable space structure, and the area of the bearing surface can be further increased for adding a solar cell panel or a reflector lens.
The assembly sequence of the expandable space structure is as follows:
1. taking a foldable tetrahedral truss structure as a base body, aligning a chuck of the central auxiliary connecting piece, inserting the chuck into a clamping groove of a joint at the inner side of the bottom, and rotating the central auxiliary connecting piece according to a locking direction;
2. sequentially installing the remaining two foldable tetrahedral truss structures according to the method in the step 1;
3. the non-foldable single rod with the T-shaped plug is sequentially aligned and embedded into the T-shaped plug interface, the non-foldable single rod with the T-shaped plug is rotated in the locking direction to be locked, and the assembly of the expandable space structure is finished;
4. when the expandable space structure needs to be disassembled and replaced, the non-foldable single rod with the T-shaped plug rotates in the unscrewing direction in sequence until the non-foldable single rod with the T-shaped plug can be moved out along the direction perpendicular to the axis of the non-foldable single rod with the T-shaped plug. And similarly, disassembling the rest non-foldable single rods with the T-shaped plugs, finally, sequentially rotating the foldable tetrahedral truss units in the unscrewing direction, sequentially disassembling the foldable tetrahedral truss units from the central auxiliary connecting piece, and finishing the disassembly of the expandable space structure.
Claims (2)
1. A folding tetrahedron truss unit structure comprises a truss unit and a folding assembly, wherein the truss unit consists of three foldable single rods, three non-foldable single rods, a bottom inner side joint, a top joint and two bottom outer side joints; two ends of a single non-foldable rod are respectively hinged and profile connected with the bottom inner side joint and the top joint; two ends of each foldable single rod are respectively hinged with the top joint and the two bottom outer side joints, and two ends of each foldable single rod are respectively hinged with the two bottom outer side joints; the three non-foldable single rods are intersected pairwise relative to the rotating axes of the bottom inner side joints and form an included angle of 60 degrees with each other, and the three non-foldable single rods are kept parallel to a plane formed by the top joint and the two bottom outer side joints; the folding rotation axis of any foldable single-rod body is kept parallel to the relative rotation axis of the connected top joint and the bottom outside joint and is vertical to a plane formed by the central axis of the foldable single-rod and the central axis of the non-foldable single-rod adjacent to the foldable single-rod;
the foldable single rod is formed by connecting two short rods with the same length through a folding assembly, the two short rods are respectively in hinge connection with an H-shaped hinge groove through two bolts, and a torsion spring is sleeved on the bolts and used for limiting the short rods and the hinge groove to rotate relatively;
the bottom inner side joint consists of three hinge joints and a clamping groove cylindrical joint, and four clamping grooves are uniformly distributed at the bottom of the clamping groove cylindrical joint along the circumferential direction;
the top joint consists of a T-shaped plug interface, a hinge interface and a cylindrical interface, the central axes of the two T-shaped plug interfaces form an angle of 60 degrees with each other, and the plane of the central axes is parallel to the plane of the bottom inner side joint and the plane of the two bottom outer side joints;
the bottom outer side joint comprises a T-shaped plug connector, a cylindrical connector and two hinge connectors, the central axes of the two hinge connectors form an angle of 60 degrees, and the plane of the central axis is superposed with the plane formed by the central axes of the three foldable single rods.
2. The structure of a folding tetrahedral truss unit according to claim 1, wherein the clamping groove cylindrical interface of the inner side joint at the bottom of the truss unit and the clamping head of the central auxiliary connecting piece form a profile connection, and the outer side joint at the bottom of the truss unit and the inner side joint at the bottom are positioned on the same plane; the T-shaped grooves at two ends of the non-foldable single rod with the T-shaped grooves are respectively in molded surface connection with the T-shaped plug interfaces of the outer side joints at the bottom of the adjacent truss unit and the top joint of the adjacent truss unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020541795.8U CN212951192U (en) | 2020-04-14 | 2020-04-14 | Folding tetrahedron truss unit structure |
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| CN202020541795.8U CN212951192U (en) | 2020-04-14 | 2020-04-14 | Folding tetrahedron truss unit structure |
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| CN212951192U true CN212951192U (en) | 2021-04-13 |
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| CN202020541795.8U Active CN212951192U (en) | 2020-04-14 | 2020-04-14 | Folding tetrahedron truss unit structure |
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