Loop antenna microgravity simulation experiment device based on magnetic suspension technology

Abstract

The invention relates to an annular antenna microgravity simulation experiment device based on a magnetic suspension technology. The annular antenna microgravity simulation experiment device comprises a rack, a linear guide rail group, a magnetic suspension driving module, a suspension rope, an annular deployable antenna, a driving rope and an antenna driving module, the linear guide rail group is horizontally arranged above the rack, and the tail end of the linear guide rail group is fixedly connected with the top end of the rack; the magnetic suspension driving modules are respectively arranged at the lower parts of the linear guide rail groups; the bottom of the magnetic suspension driving module is connected with nodes of the annular deployable antenna through suspension ropes. And the antenna driving module is arranged at one end of the bottom of the rack. The device has the characteristics of high-precision microgravity environment simulation, a large-aperture annular deployable antenna structure, excellent synchronous following performance and no friction, and solves the problems that the friction force is large, the antenna node and the gravity compensation device cannot be synchronized in real time and the like when the conventional large-aperture annular antenna performs a gravity compensation experiment by using a suspension method.

Description

Technical Field

[0001] The present invention relates to the technical field of aerospace equipment testing, and in particular to a microgravity simulation experimental device for a ring antenna based on magnetic levitation technology. Background Art

[0002] China's space industry has experienced rapid development in recent decades, achieving remarkable successes from the "Two Bombs, One Satellite" program to lunar exploration and manned space flight, demonstrating strong innovation capabilities and national strength. As a major national project, the space industry involves numerous core technologies and is a crucial component of the national development strategy. With the ongoing space exploration missions and the construction of large-scale space stations, satellite-borne antennas have become critical technical equipment for communication between ground-based and space-based equipment. Due to space limitations within launch vehicles, communication range requirements, and the advancement of satellite technology, large-aperture annular deployable antennas have become increasingly necessary. These antennas, with deployed apertures ranging from 6 to 150 meters, are widely used in mobile communications, radiation measurement, and deep space exploration.

[0003] However, antenna manufacturing is expensive, and space assembly and maintenance are extremely difficult. After leaving the Earth and entering space, they will face adverse factors such as microgravity, which will have a very large impact on the accuracy, lifespan and performance of the antenna. To ensure the reliability and good mechanical properties of the antenna, a ground microgravity environment simulation experiment must be carried out before the antenna enters space.

[0004] At present, the more mature microgravity simulation methods include the drop tower method, parabolic flight method, water flotation method, air flotation method and suspension method. Among these methods, the suspension method is usually used for gravity compensation experiments on annular deployable antennas. However, when the suspension method is used for gravity compensation experiments on large-aperture annular deployable antennas, there are problems such as large friction and the inability to synchronize the antenna nodes and the gravity compensation device in real time, which has a certain impact on the accuracy of gravity compensation. Summary of the Invention

[0005] In response to the above problems, the purpose of the present invention is to provide a loop antenna microgravity simulation experimental device based on magnetic levitation technology, which uses magnetic levitation technology to compensate for the gravity of the loop deployable antenna, thereby simulating the working state of the loop antenna in a space environment. It has the characteristics of high-precision microgravity environment simulation, large-aperture loop deployable antenna structure, excellent synchronous following performance, and no friction.

[0006] The technical solution adopted in the present invention is as follows:

[0007] The present invention proposes a microgravity simulation experimental device for a ring antenna based on magnetic levitation technology, comprising a frame, a linear guide rail group, a magnetic levitation drive module, a suspension rope, a ring-shaped deployable antenna, a drive rope, and an antenna drive module; the linear guide rail group is horizontally arranged above the frame, and its tail end is fixedly connected to the top of the frame; the magnetic levitation drive modules are respectively arranged at the lower part of the linear guide rail group; the bottom of the magnetic levitation drive module is respectively connected to the nodes of the ring-shaped deployable antenna through the suspension rope; the antenna drive module is arranged at one end of the bottom of the frame; and the drive rope is connected between the ring-shaped deployable antenna, the frame, and the antenna drive module.

[0008] Furthermore, the linear guide rail group is composed of multiple T-shaped linear guide rails, one end of each T-shaped linear guide rail overlaps and is at the same horizontal height, and the overall structure is radial; the overlapping end of each T-shaped linear guide rail is fixedly connected to the top of the frame; the magnetic levitation drive module is arranged one by one on the outside of the vertical end of each T-shaped linear guide rail in a rail-holding manner.

[0009] Furthermore, the magnetic levitation drive module includes a magnetic conductive plate, a disk-shaped electromagnet, a primary, a secondary, a permanent magnet, a magnetic isolation plate and a main frame; an opening corresponding to the vertical end of the T-shaped linear guide is provided at the top of the main frame, and the opening is used to surround the outside of the vertical end of the T-shaped linear guide; the magnetic conductive plate is fixedly connected to the lower surface of the horizontal end of the T-shaped linear guide; the disk-shaped electromagnet is installed on both sides of the upper end surface of the main frame and corresponds to the magnetic conductive plate; the primary is fixed on the left and right sides of the inside of the main frame; the secondary is respectively arranged on the inner side of the primary and fixedly connected to the vertical end of the T-shaped linear guide; the permanent magnet is respectively arranged between the primary and the secondary and fixedly connected to the secondary; the magnetic isolation plate is horizontally arranged on the upper side of the inside of the main frame and vertically fixedly connected to the vertical end of the T-shaped linear guide to form a cross structure.

[0010] Furthermore, the annular expandable antenna is formed by connecting a plurality of antenna units in sequence.

[0011] Furthermore, the antenna unit includes a three-rod node, a five-rod node, a horizontal rod, a vertical rod and an oblique rod; the horizontal rod and the vertical rod form a quadrilateral structure; the oblique rod is arranged between a group of diagonal corners of the quadrilateral structure; the ends corresponding to the horizontal rod and the vertical rod are connected through a three-rod node; the ends corresponding to the horizontal rod, the vertical rod and the oblique rod are connected through a five-rod node.

[0012] Furthermore, the three-bar node includes a three-bar node plate, two cross bar connectors and a vertical bar connector; the three-bar node plate is an axisymmetric structure about the center line, and its end faces on both sides form an angle of 150°; the symmetry axes of the two cross bar connectors are connected to the left and right sides of the upper end of the three-bar node plate, and gears of the same specifications and meshing with each other are respectively provided on the inner sides of the two cross bar connectors; the vertical bar connector is vertically fixed to the bottom end of the three-bar node plate.

[0013] Furthermore, the five-bar node includes a five-bar node plate, two cross-bar connectors, two oblique rod connectors, a vertical rod connector, three connecting plates with grooves, two driving torsion springs and three wire pulleys; the five-bar node plate is a symmetrical structure about the center line; the symmetry axes of the two cross-bar connectors are connected to the two sides of the lower part of the five-bar node plate; the symmetry axes of the two oblique rod connectors are connected to the two sides of the upper part of the five-bar node plate; the vertical rod connector is vertically fixed to the top of the five-bar node plate; two connecting plates with grooves are vertically fixed to the left and right sides of the inside of the five-bar node plate, and the other connecting plate with grooves is fixed to the rear side of the inside of the five-bar node plate; the two driving torsion springs are respectively installed on the rotating shafts of the two cross-bar connectors, and the two driving torsion springs are compressed to store elastic potential energy during installation; the three wire pulleys are respectively connected to the ends of the three connecting plates with grooves corresponding to the axes.

[0014] Furthermore, the frame includes a horizontal frame, a vertical frame and a pulley; the vertical frame is fixedly connected to one side of the horizontal frame; and the pulley is rotatably connected to the front and rear sides of the upper middle portion of the vertical frame.

[0015] Furthermore, the driving rope passes through the entire oblique rod of the annular deployable antenna, and both ends pass through the rear side and pass through two pulleys in sequence before being connected to the antenna driving module to form a winding structure.

[0016] Furthermore, the antenna driving module includes a motor, a motor base, a reel and a reel support; the motor is fixedly connected to the rear end of the horizontal frame through the motor base; one end of the reel is connected to the motor shaft, and the other end is connected to the horizontal frame through the reel support; the reel is rotatably connected to the reel support; the driving rope is wound around the reel.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention has the advantages of being frictionless and having excellent synchronous following performance, and can effectively solve the problems of large friction and inability to synchronize the antenna node and the gravity compensation device in real time when the current large-caliber loop antenna uses the suspension method to conduct gravity compensation experiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a structural diagram of the rack;

[0021] Figure 3 It is a structural diagram of the magnetic levitation drive module;

[0022] Figure 4 It is a schematic diagram of the structure of primary, secondary and permanent magnet;

[0023] Figure 5 It is a schematic diagram of the unit structure of the loop antenna;

[0024] Figure 6 This is a structural diagram of the antenna driver module;

[0025] Figure 7 It is a schematic diagram of the three-bar node structure;

[0026] Figure 8 It is a schematic diagram of the five-bar node structure.

[0027] Among them, the figure marks are: 1-frame; 2-linear guide rail; 3-magnetic levitation drive module; 4-suspension rope; 5-annular deployable antenna; 6-antenna drive module; 7-drive rope; 101-pulley; 301-magnetic plate; 302-disc electromagnet; 303-primary; 304-secondary; 305-permanent magnet; 306-magnetic isolation plate; 307-main frame; 501-three-bar node; 502-five-bar node; 503-horizontal Rod; 504-vertical rod; 505-diagonal rod; 601-motor; 602-motor base; 603-reel; 604-reel support; 506-three-rod node plate; 507-cross bar connector; 508-vertical rod connector; 509-five-rod node plate; 510-cross bar connector; 511-diagonal rod connector; 512-vertical rod connector; 513-connecting plate with groove; 514-driving torsion spring; 515-line pulley. DETAILED DESCRIPTION

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] It should be noted that, in the description of the present invention, the terms "up", "down", "top", "bottom", "one side", "the other side", "left", "right", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not mean that the device or element must have a specific orientation, be constructed and operated in a specific orientation.

[0030] See attached Figure 1The specific structure of an embodiment of a microgravity simulation experimental device for a ring antenna based on magnetic levitation technology proposed by the present invention is given. The device comprises a frame (1), a linear guide rail group (2), a magnetic levitation drive module (3), a suspension rope (4), a ring-shaped deployable antenna (5), an antenna drive module (6) and a drive rope (7); the linear guide rail group (2) is horizontally arranged above the frame (1), and its tail end is fixedly connected to the top of the frame (1); the magnetic levitation drive module (3) is respectively arranged at the lower part of the linear guide rail group (2); the bottom of the magnetic levitation drive module (3) is respectively connected to the node of the ring-shaped deployable antenna (5) through the suspension rope (4); the antenna drive module (6) is arranged at one end of the bottom of the frame (1).

[0031] Among them, such as Figure 2 As shown, the frame (1) is composed of a horizontal frame and a vertical frame fixedly connected to one side of the horizontal frame, and the front and rear sides of the upper middle portion of the vertical frame are respectively connected to pulleys (101) for rotation, which have a guiding function; the linear guide rail group (2) is composed of five T-shaped linear guide rails, one end of each T-shaped linear guide rail overlaps and is at the same horizontal height, and the overall structure is radial. In this embodiment, the ends of the five T-shaped linear guide rails are connected in sequence to form a regular hexagonal structure; the overlapping end of each T-shaped linear guide rail is fixedly connected to the top of the vertical frame of the frame (1); the magnetic levitation drive module (3) is respectively arranged on the outside of the vertical end of each T-shaped linear guide rail in a one-to-one manner in a rail-holding manner to prevent derailment and can synchronously follow the ring antenna (5) to move.

[0032] like Figure 3 and Figure 4As shown, the magnetic suspension drive module (3) includes a magnetic plate (301), a disk-shaped electromagnet (302), a primary (303), a secondary (304), a permanent magnet (305), a magnetic isolation plate (306) and a main frame (307); the main frame (307) is provided with an opening corresponding to the vertical end of the T-shaped linear guide rail at the top, and the main frame (307) is surrounded by the outside of the vertical end of the T-shaped linear guide rail through the opening; the magnetic plate (301) is fixedly connected to the lower surface of the horizontal end of the T-shaped linear guide rail; the disk-shaped electromagnet (302) is installed on both sides of the upper end surface of the main frame (307) and corresponds to the position of the magnetic plate (301), and the disk-shaped electromagnet (302) interacts with the magnetic plate (301) to generate a counteracting loop antenna. (5) electromagnetic force of gravity; the primary (303) is fixed on the left and right sides of the main frame (307); the secondary (304) is respectively arranged on the inner side of the primary (303) and fixedly connected to the vertical end of the T-shaped linear guide rail, and the secondary (304) interacts with the primary (303) to generate a traction force that causes the magnetic suspension drive module (3) to move linearly; the permanent magnet (305) is respectively arranged between the primary (303) and the secondary (304) and fixedly connected to the secondary (304), and its function is to generate an excitation magnetic field; the magnetic isolation plate (306) is horizontally arranged on the upper side of the main frame (307) and fixedly connected to the vertical end of the T-shaped linear guide rail to form a cross structure to prevent mutual influence between magnetic fields.

[0033] The bottom of the main frame (307) of each magnetic suspension drive module (3) is connected to the upper node of the annular deployable antenna (5) via a suspension rope (4).

[0034] In this embodiment, the annular expandable antenna (5) is formed by connecting twelve antenna units in sequence. Figure 5 As shown, the antenna unit includes a three-rod node (501), a five-rod node (502), a horizontal rod (503), a vertical rod (504) and an oblique rod (505); the horizontal rod (503) and the vertical rod (504) form a quadrilateral structure; the oblique rod (505) is arranged between a group of diagonally opposite corners of the quadrilateral structure; the horizontal rod (503) and the vertical rod (504) are connected at one end by the three-rod node (501), and the other node of the three-rod node (501) is connected to the horizontal rod (503) of an adjacent group of antenna units; the horizontal rod (503), the vertical rod (504) and the oblique rod (505) are connected at one end by the five-rod node (502), and the other two nodes are connected to the oblique rod (505) and the horizontal rod (503) of an adjacent group of antenna units. Two adjacent antenna units share one vertical rod (504).

[0035] like Figure 7As shown, the three-bar node (501) includes a three-bar node plate (506), two cross-bar connectors (507) and a vertical rod connector (508); the three-bar node plate (506) is a symmetrical structure about the center line, and its two side end faces form an angle of 150°; the two cross-bar connectors (507) are connected to the left and right sides of the upper end of the three-bar node plate (506) by the symmetry axis, and the inner sides of the two cross-bar connectors (507) are respectively provided with gears of the same specifications and meshing with each other, so as to ensure that the entire annular deployable antenna (5) can be deployed synchronously; the vertical rod connector (508) is vertically fixed to the bottom end of the three-bar node plate (506).

[0036] like Figure 8 As shown, the five-bar node (502) includes a five-bar node plate (509), two crossbar connectors (510), two oblique rod connectors (511), a vertical rod connector (512), three connecting plates with grooves (513), two driving torsion springs (514) and three wire pulleys (515); the five-bar node plate (509) is an axisymmetric structure about the center line; the symmetry axes of the two crossbar connectors (510) are connected to both sides of the lower part of the five-bar node plate (509); the symmetry axes of the two oblique rod connectors (511) are connected to both sides of the upper part of the five-bar node plate (509); the vertical rod connector (512) is vertically fixed to the top of the five-bar node plate (509); the two with A connecting plate (513) with grooves is vertically fixed to the left and right sides of the inside of the five-bar node plate (509), and another connecting plate (513) with grooves is fixed to the rear side of the inside of the five-bar node plate (509); ensuring that the driving rope can smoothly enter the groove of the pulley when tensioned; two driving torsion springs (514) are respectively installed on the rotating shafts of the two crossbar connecting members (510); the two driving torsion springs (514) are compressed and stored in elastic potential energy when installed, and provide driving force when the ring antenna (5) is deployed in the early stage; three wire pulleys (515) are respectively connected to the groove ends of the three connecting plates (513) with grooves on corresponding axes, and the functions of the wire pulleys (515) are mainly to guide and reduce friction.

[0037] The antenna driving module (6) comprises a motor (601), a motor base (602), a reel (603) and a reel support (604); the motor (601) is fixedly connected to the rear end of the bottom of the frame (1) via the motor base (602); one end of the reel (603) is connected to the motor shaft, and the other end is connected to the frame (1) via the reel support (604); the reel (603) is rotatably connected to the reel support (604); and the motor (601) is used to provide driving force when the annular deployable antenna (5) is deployed in the later stage.

[0038] The driving rope (7) passes through the entire oblique rod (505) of the loop antenna (5), and the two ends of the driving rope (7) pass through the top of the rear side of the loop deployable antenna (5), pass through the front and rear pulleys (101) in sequence, and are wound on the reel (603). The antenna driving module (6) and the driving rope (7) form a winding structure for realizing orderly winding and releasing of the driving rope (7).

[0039] The specific working process and principle of the device of the present invention are as follows:

[0040] Step S1: preparation work; the magnetic levitation drive module (3) is overlapped on the safety plate in the middle of the linear guide rail group (2); a vertical rod (504) of the annular deployable antenna (5) close to the vertical frame of the frame (1) is fixed to the frame (1); a driving rope (7) passes through the oblique rod (505) of the entire annular deployable antenna (5) and is connected to the antenna drive module (6) through the frame (1) and the pulley (101).

[0041] Step S2: Suspension; the disk-shaped electromagnet (302) and the magnetic conductive plate (301) interact to generate a suspension force, so that the magnetic suspension drive module (3) is stabilized near the working point.

[0042] Step S3: unfolding the loop antenna; the unfolding process of the loop expandable antenna (5) is divided into two stages. In the first stage, the end of the crossbar joint at the five-bar node (502) is equipped with a pre-compressed driving torsion spring (514). Under the driving action of the torsion spring, the antenna begins to unfold. At this time, the rope is in a relaxed state. When it is unfolded to 40%, it enters the second stage. At this time, the motor (601) starts the driving drum (603), pulling the two ends of the driving rope (7) in the diagonal rod (505) to tighten the rope, shorten the length of the driving rope (7), and shrink the diagonal diagonal rod (505), finally realizing the complete unfolding of the entire loop expandable antenna (5).

[0043] Step S4: synchronous following; the primary (303) and the secondary (304) interact with each other to generate traction, so that the magnetic suspension drive module (3) synchronously follows the unfolding movement of the annular deployable antenna (5).

[0044] Matters not covered in the present invention are all known technologies.

[0045] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A microgravity simulation experimental device with a loop antenna based on magnetic levitation technology, characterized by: The device includes a frame, a linear guide rail group, a magnetic levitation drive module, a suspension rope, a ring-shaped deployable antenna, a drive rope and an antenna drive module; the linear guide rail group is horizontally arranged above the frame, and its tail end is fixedly connected to the top of the frame; the magnetic levitation drive modules are respectively arranged at the lower part of the linear guide rail group; the bottom of the magnetic levitation drive module is respectively connected to the node of the ring-shaped deployable antenna through the suspension rope; the antenna drive module is arranged at one end of the bottom of the frame; the drive rope is connected between the ring-shaped deployable antenna, the frame and the antenna drive module.

2. The microgravity simulation experimental device based on a loop antenna and magnetic levitation technology according to claim 1, characterized in that: The linear guide rail group is composed of multiple T-shaped linear guide rails, one end of each T-shaped linear guide rail overlaps and is at the same horizontal height, and the overall structure is radial; the overlapping end of each T-shaped linear guide rail is fixedly connected to the top of the frame; the magnetic levitation drive module is arranged one by one on the outside of the vertical end of each T-shaped linear guide rail in a rail-holding manner.

3. The microgravity simulation experimental device based on a loop antenna and magnetic levitation technology according to claim 2, characterized in that: The magnetic levitation drive module includes a magnetic conductive plate, a disk-shaped electromagnet, a primary, a secondary, a permanent magnet, a magnetic isolation plate and a main frame; an opening corresponding to the vertical end of the T-shaped linear guide is provided at the top of the main frame, and the opening is used to surround the outside of the vertical end of the T-shaped linear guide; the magnetic conductive plate is fixedly connected to the lower surface of the horizontal end of the T-shaped linear guide; the disk-shaped electromagnet is installed on both sides of the upper end surface of the main frame and corresponds to the magnetic conductive plate; the primary is fixed on the left and right sides of the inside of the main frame; the secondary is respectively arranged on the inner side of the primary and fixedly connected to the vertical end of the T-shaped linear guide; the permanent magnet is respectively arranged between the primary and the secondary and fixedly connected to the secondary; the magnetic isolation plate is horizontally arranged on the upper side of the inside of the main frame and vertically fixedly connected to the vertical end of the T-shaped linear guide to form a cross structure.

4. The microgravity simulation experimental device based on a loop antenna and magnetic levitation technology according to claim 1, characterized in that: The annular expandable antenna is formed by connecting a number of antenna units in sequence.

5. The microgravity simulation experimental device of a loop antenna based on magnetic levitation technology according to claim 4, characterized in that: The antenna unit includes a three-rod node, a five-rod node, a horizontal rod, a vertical rod and an oblique rod; the horizontal rod and the vertical rod form a quadrilateral structure; the oblique rod is arranged between a group of diagonally opposite corners of the quadrilateral structure; the ends corresponding to the horizontal rod and the vertical rod are connected through a three-rod node; the ends corresponding to the horizontal rod, the vertical rod and the oblique rod are connected through a five-rod node.

6. The microgravity simulation experimental device using a loop antenna based on magnetic levitation technology according to claim 5, characterized in that: The three-bar node includes a three-bar node plate, two cross-bar connectors and a vertical rod connector; the three-bar node plate is an axisymmetric structure about the center line, and its two side end faces form an angle of 150°; the symmetry axes of the two cross-bar connectors are connected to the left and right sides of the upper end of the three-bar node plate, and the inner sides of the two cross-bar connectors are respectively provided with gears of the same specifications and meshing with each other; the vertical rod connector is vertically fixed to the bottom end of the three-bar node plate.

7. The microgravity simulation experimental device using a loop antenna based on magnetic levitation technology according to claim 5, characterized in that: The five-bar node includes a five-bar node plate, two cross-bar connectors, two oblique rod connectors, a vertical rod connector, three connecting plates with grooves, two driving torsion springs and three wire pulleys; the five-bar node plate is a symmetrical structure about the center line; the symmetry axes of the two cross-bar connectors are connected to the two sides of the lower part of the five-bar node plate; the symmetry axes of the two oblique rod connectors are connected to the two sides of the upper part of the five-bar node plate; the vertical rod connector is vertically fixed to the top of the five-bar node plate; two connecting plates with grooves are vertically fixed to the left and right sides of the inside of the five-bar node plate, and the other connecting plate with grooves is fixed to the rear side of the inside of the five-bar node plate; the two driving torsion springs are respectively installed on the rotating shafts of the two cross-bar connectors, and the two driving torsion springs are compressed to store elastic potential energy during installation; the three wire pulleys are respectively connected to the ends of the three connecting plates with grooves corresponding to the axes.

8. The microgravity simulation experimental device using a loop antenna based on magnetic levitation technology according to claim 7, characterized in that: The frame comprises a horizontal frame, a vertical frame and pulleys; the vertical frame is fixedly connected to one side of the horizontal frame; and the pulleys are rotatably connected to the front and rear sides of the upper middle portion of the vertical frame.

9. The microgravity simulation experimental device using a loop antenna based on magnetic levitation technology according to claim 8, characterized in that: The driving rope passes through the entire oblique rod of the annular deployable antenna, and both ends pass through the rear side and pass through two pulleys in sequence before being connected to the antenna driving module to form a winding structure.

10. The microgravity simulation experimental device using a loop antenna based on magnetic levitation technology according to claim 9, characterized in that: The antenna driving module includes a motor, a motor base, a reel and a reel support; the motor is fixedly connected to the rear end of the horizontal frame through the motor base; one end of the reel is connected to the motor shaft, and the other end is connected to the horizontal frame through the reel support; the reel is rotatably connected to the reel support; the driving rope is wound around the reel.

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