阅读说明：本技术 一种可展收的桁架式伸展臂 (Truss type stretching arm capable of being unfolded and folded ) 是由 曹彬彬 蔡志勤 刘忠振 于 2021-09-16 设计创作，主要内容包括：本发明提供一种可展收的桁架式伸展臂,属于机械领域。本发明包括上端部结构、下端部结构、伸展单元和驱动装置。伸展臂的展开和回收通过两根拉绳来实现,两根拉绳分别交替缠绕在竖杆的滑轮上。通过电机拉动展开拉绳,拉绳拉动滑轮使得滑轮的间距变小,从而实现伸展臂的展开。在回收过程,同样是通过电机拉动回收拉绳,拉绳拉动滑轮使得滑轮间距变小来实现伸展臂的回收。与现有技术相比,伸展臂竖杆增多,提高了伸展臂的承载能力。伸展臂具有回收功能,使得伸展臂更加灵活,避免被太空垃圾所破坏。(The invention provides a foldable truss type stretching arm, and belongs to the field of machinery. The invention comprises an upper end structure, a lower end structure, a stretching unit and a driving device. The stretching arm is unfolded and retracted through two pull ropes, and the two pull ropes are wound on the pulleys of the vertical rod alternately. The stretching rope is stretched through the pulling of the motor, and the distance between the pulleys is reduced through the pulling of the stretching rope, so that the stretching of the stretching arm is realized. In the recovery process, the motor pulls the recovery pull rope, and the pull rope pulls the pulley to enable the distance between the pulleys to be reduced so as to realize recovery of the stretching arm. Compared with the prior art, the number of vertical rods of the extension arm is increased, and the bearing capacity of the extension arm is improved. The extending arm has a recycling function, so that the extending arm is more flexible and is prevented from being damaged by space garbage.)

1. A collapsible truss type stretching arm is characterized by comprising an upper end structure, a lower end structure, a stretching unit and a driving device;

the upper end structure and the lower end structure respectively comprise a polygonal transverse plate and a short vertical rod, two ends of each side edge of the polygonal transverse plate are respectively provided with a hole, and the holes are hinged with the end part of one short vertical rod; a positioning pin is arranged near the hole at the right end, the positioning pin of the upper end structure is arranged at the upper right part of the hole, and the positioning pin of the lower end structure is arranged at the lower right part of the hole;

the stretching unit comprises an upper polygonal transverse plate, a lower polygonal transverse plate and a long vertical rod connected with the upper polygonal transverse plate, two ends of each side edge of the polygonal transverse plate are respectively provided with a hole and are hinged with the middle part of one long vertical rod, the end parts of the two long vertical rods connected with the upper polygonal transverse plate and the lower polygonal transverse plate at the same side between the stretching units are hinged, and the hinged parts of the two long vertical rods connected at the same side are provided with pulleys; in the uppermost extension unit, the end part of a long vertical rod on the upper polygonal transverse plate is hinged with the end part of a short vertical rod on the upper end structure on the same side; in the lowest extension unit, the end part of a long vertical rod on a lower polygonal transverse plate is hinged with the end part of a short vertical rod on a lower end structure on the same side; in each extension unit, a positioning pin is arranged at the right lower part of a hole at the right end of the polygonal transverse plate at the upper part, and a positioning pin is arranged at the right upper part of a hole at the right end of the polygonal transverse plate at the lower part;

the driving device comprises an unfolding pull rope, a recovery pull rope and a driving motor; go up end structure, extend between unit and the lower end structure through the articulated pile of member and become integrative, to about on the polygon diaphragm the perpendicular that forms with the side: expand stay cord one end and fix on upper end structure left end, later wire winding order is in proper order: the upper ends of a first long vertical rod at the right end, a second long vertical rod at the left end, a third long vertical rod at the right end and a fourth long vertical rod at the left end are orderly connected and finally connected with a driving motor at the left end of the lower end part structure; retrieve stay cord one end and fix on upper end structure right end, later wire winding order is in proper order: the upper ends of a first long vertical rod at the left end, a second long vertical rod at the right end, a third long vertical rod at the left end and a fourth long vertical rod at the right end are orderly connected and finally connected with a driving motor on the right end of the lower end part structure.

2. The extendable and retractable truss-type extending arm as claimed in claim 1, wherein the material of the polygonal transverse plate, the long vertical rod and the short vertical rod is aluminum alloy.

3. The foldable truss-type stretching arm as claimed in claim 1 or 2, wherein the material of the unfolding pulling rope and the recycling pulling rope is nylon.

Technical Field

The invention relates to a foldable truss type stretching arm, and belongs to the field of machinery.

Background

The space extending arm is an important component of a satellite antenna system and is a one-dimensional unfolding structure. The space expansion antenna is used as a support framework of a large space expansion antenna, a solar sail and a telescope, a space manipulator, a space platform and the like. Whether the extending arm can be timely and accurately unfolded directly influences the success of the whole satellite launching task. Moreover, most of the extending arms in the prior art are locked after being unfolded, the structure is complex, and the extending arms do not have the recycling function, but due to the increase of space garbage, the normal operation of the extending arms on the satellite is threatened greatly.

Disclosure of Invention

In order to solve the problems, the invention provides a foldable truss type extending arm. The invention adopts the rope drive of the drive motor, thereby realizing the unfolding, the recovery and the locking of the extending arm, improving the flexibility and the bearing capacity of the extending arm, reducing the number of hinges and reducing the complexity of the structure of the extending arm.

The technical scheme of the invention is as follows:

a foldable truss type stretching arm is a triangular prism type truss structure stretching arm and comprises an upper end structure, a lower end structure, a stretching unit and a driving device;

the upper end structure and the lower end structure respectively comprise a polygonal transverse plate and a short vertical rod, two ends of each side edge of the polygonal transverse plate are respectively provided with a hole, and the holes are hinged with the end part of one short vertical rod; a positioning pin is arranged near the hole at the right end, the positioning pin of the upper end structure is arranged at the upper right part of the hole, and the positioning pin of the lower end structure is arranged at the lower right part of the hole;

the stretching unit comprises an upper polygonal transverse plate, a lower polygonal transverse plate and a long vertical rod connected with the upper polygonal transverse plate, two ends of each side edge of the polygonal transverse plate are respectively provided with a hole and are hinged with the middle part of one long vertical rod, the end parts of the two long vertical rods connected with the upper polygonal transverse plate and the lower polygonal transverse plate at the same side between the stretching units are hinged, and the hinged parts of the two long vertical rods connected at the same side are provided with pulleys; in the uppermost extension unit, the end part of a long vertical rod on the upper polygonal transverse plate is hinged with the end part of a short vertical rod on the upper end structure on the same side; in the lowest extension unit, the end part of a long vertical rod on a lower polygonal transverse plate is hinged with the end part of a short vertical rod on a lower end structure on the same side; in each extension unit, a positioning pin is arranged at the right lower part of a hole at the right end of the polygonal transverse plate at the upper part, and a positioning pin is arranged at the right upper part of a hole at the right end of the polygonal transverse plate at the lower part;

the driving device comprises an unfolding pull rope, a recovery pull rope and a driving motor; go up end structure, extend between unit and the lower end structure through the articulated pile of member and become integrative, to about on the polygon diaphragm the perpendicular that forms with the side: expand stay cord one end and fix on upper end structure left end, later wire winding order is in proper order: the upper ends of a first long vertical rod at the right end, a second long vertical rod at the left end, a third long vertical rod at the right end and a fourth long vertical rod at the left end are orderly connected and finally connected with a driving motor at the left end of the lower end part structure; retrieve stay cord one end and fix on upper end structure right end, later wire winding order is in proper order: the upper ends of a first long vertical rod at the left end, a second long vertical rod at the right end, a third long vertical rod at the left end and a fourth long vertical rod at the right end are orderly connected and finally connected with a driving motor on the right end of the lower end part structure.

Furthermore, the polygonal transverse plates, the long vertical rods and the short vertical rods are made of aluminum alloy.

Furthermore, the material of the unfolding pulling rope and the recycling pulling rope is nylon.

The invention has the beneficial effects that: each vertical rod is connected up and down, and the unfolding speed of the stretching arm is increased. The number of the vertical rods is increased, and the bearing capacity of the extending arm is improved. The stretching arm is driven to stretch and retract through the pull rope, the stretching arm has a recycling function while the quality and the complexity of the stretching arm are reduced, and the flexibility of the stretching arm is improved.

Drawings

Fig. 1 shows an end structure of an extension arm.

FIG. 2 is a top view of the triangular cross plate.

FIG. 3 is a side view of the triangular cross plate.

Fig. 4 is a short vertical bar.

Fig. 5 is a stretching unit.

Fig. 6 is a long vertical bar.

Fig. 7 shows the initial state of the extending arm.

Fig. 8 shows the expansion arms after the deployment is completed.

In the figure: 11, a triangular transverse plate A; 12 short vertical rods; 21 positioning pins; 51, a triangular transverse plate B; 52 pulley A; 53 long vertical bars A; a 54-long vertical bar B; 55 a pulley B; 56 triangular transverse plate C; 57 pulley C; 58 pulley D; 80 unwinding the draw string; 81, recovering the pull rope; 82, recovering a pull rope fixing hinge; 83 a pulley E; 84 pulley F; 85 pulley G; 86 pulley H; 87 pulley I; 88 pulley J; 89 unfolding the stay cord fixing hinge.

Detailed Description

The following further describes a specific embodiment of the present invention with reference to the drawings and technical solutions.

A truss type extensible arm capable of being unfolded and folded is a triangular prism type truss structure extensible arm and consists of an upper end structure, a lower end structure, a plurality of extensible units hinged end to end and a driving device;

the upper end part and the lower end part have the same structure and are both composed of a triangular transverse plate A11 and a short vertical rod 12. Two holes are provided on each side of the triangular cross piece a11 (fig. 3), each hinged to a hole in the side rail 12. The top end structure of the extending arm is mainly used for connecting a satellite antenna and the like, and the bottom end structure of the extending arm is mainly used for connecting a base of the extending arm.

The extension unit consists of two triangular transverse plates B51, a triangular transverse plate C56 and 12 long vertical rods. The triangular cross plate B51, the triangular cross plate C56 and the cross bars in the end structures are the same, and the triangular cross plate B51 and the triangular cross plate C56 are arranged up and down. The long vertical rod is respectively provided with three holes (figure 6), and the middle hole is hinged with the holes on the sides of the triangular transverse plate B51 and the triangular transverse plate C56. The long vertical rod A53 and the long vertical rod B54 are hinged as shown in figure 5, meanwhile, a pulley B55 is added on the hinge, and other vertical rods are assembled in the same way. The stretching unit and the stretching unit are directly assembled through direct hinging of the vertical rod and the vertical rod, and a pulley is also added on the hinge.

The driving device consists of two pull ropes and a driving motor, wherein one of the pull ropes 80 is responsible for unfolding the stretching arm, and the other pull rope 81 is responsible for folding the stretching arm. One end of the unfolding pull rope 80 is fixed on an unfolding pull rope fixing hinge 89 at the end part of the unfolding arm, then the unfolding pull rope passes by a pulley E83, then passes by a pulley I87, sequentially passes by a pulley H86 and is connected to a driving motor. One end of the recovery pull rope 81 is fixed on a recovery pull rope fixing hinge 82 of the end structure of the stretching arm, then the recovery pull rope passes by a pulley J88, then passes by a pulley F84, sequentially and finally passes by a pulley G85, and then is connected to the driving motor. The other two surfaces of the extension arm are identical to this assembly.

The triangular transverse plate is made of aluminum alloy. The long vertical rods and the short vertical rods are made of aluminum alloy. The pull rope is made of nylon.

In the unfolding process, the distance between the pulley A52 and the pulley C57 is gradually reduced, so that the unfolding pulling rope is wound around the pulley A52 and the pulley C57, the unfolding pulling lock is pulled by a motor, the distance between the pulley A52 and the pulley C57 is reduced, and the unfolding of the stretching unit is completed. On the other extension units, the winding mode of the zipper is the same, so when the motor pulls the rope, all the extension units simultaneously complete the unfolding action. In the recovery process, the distance between the pulley B55 and the pulley D58 is gradually reduced, so that the recovery pull rope is wound around the pulley B55 and the pulley D58, the recovery zipper is pulled by the motor, the distance between the pulley B55 and the pulley D58 is reduced, and the recovery of the extension unit is completed. On other extension units, the winding mode of the zipper is the same, so when the motor pulls the rope, all extension units complete the recovery action at the same time.

The initial state of the extending arm, as shown in fig. 7, is that during the unfolding process the vertical rod is rotated to the position of the positioning pin 21, indicating that the unfolding is completed (fig. 8). After deployment is complete, the deployment and retrieval zippers remain in tension to lock the deployment arm.