Friction type guide mechanism

Abstract

The invention discloses a friction type guide mechanism which comprises a friction resistance device, a rope guide wheel assembly and a rope winding wheel assembly. Wherein the frictional resistance device and the rope guide wheel assembly are arranged on the first carpet surface; the rope winding wheel assembly is arranged on the second carpet surface; and a rope of the frictional resistance device is wound on the rope winding wheel assembly through the rope guide wheel assembly. According to the device, the idle stroke can be adjusted in the initial unfolding process (without friction force), a small amount of constant resistance is provided in the unfolding process to guarantee the carpet surface tension, and the overall unfolding movement direction has the function that the sensitivity to the resistance is not high.

Description

Technical Field

[0001] The invention belongs to the technical field of spacecraft space deployment mechanisms, and in particular relates to a friction type guiding mechanism. Background Art

[0002] Unlike traditional rigid solar wings, flexible solar wings, in addition to the locking impact at the end of the deployment, also involve the relaxation of the flexible blanket during the deployment process. In a zero-gravity environment, the blanket surface is affected by the vibration during deployment and the frequency of the entire spacecraft and is very likely to swing uncontrollably. It is unacceptable whether its swinging inertia will cause the solar wing to swing as a whole or the solar wing itself and the overall floating are too large and the blanket is torn.

[0003] Therefore, it is necessary to apply a constant reverse resistance to the unfolding process to ensure that there is a certain tension on the blanket surface during the unfolding process so that the blanket surface can remain in a tensioned state during the unfolding process. Most existing damping mechanisms are designed as passive unfolding devices. The damping force, mechanism volume and weight they provide are too large to maintain the tension of the blanket surface. In addition, the usual damping mechanism is a liquid damper, and the stroke is mostly less than 360°. If the flexible solar wing needs to be unfolded to accommodate the design of an enlarged gear train, it is difficult to meet the needs of flexible solar wings with ultra-large unfolding areas. Summary of the invention

[0004] The technical problem solved by the present invention is: to overcome the shortcomings of the prior art and provide a friction guiding mechanism, which realizes the functions of adjustable idle stroke (no friction) in the initial unfolding process, providing a small amount of constant resistance during the unfolding process to ensure the tension of the blanket surface, and providing low sensitivity to resistance in the overall unfolding movement direction.

[0005] The object of the present invention is achieved through the following technical scheme: a friction guiding mechanism, comprising: a friction resistor, a guide rope wheel assembly and a rope winding wheel assembly; wherein, the friction resistor and the guide rope wheel assembly are arranged on a first blanket surface; the rope winding wheel assembly is arranged on a second blanket surface; the rope of the friction resistor is wound around the rope winding wheel assembly through the guide rope wheel assembly.

[0006] In the above-mentioned friction-type guiding mechanism, the first blanket surface and the second blanket surface are adjacent to each other.

[0007] In the above-mentioned friction guiding mechanism, the damping force provided by the friction resistor is transmitted through the rope; the guide rope wheel assembly is used to guide and prevent the rope from escaping; and the rope winding wheel assembly serves as the fixed end of the rope.

[0008] In the above-mentioned friction guiding mechanism, the friction resistor includes a roller, a lower bracket, a first friction plate, a second friction plate, a loading spring, a wire blocking column, a first anti-escape cover, a second anti-escape cover, an intermediate shaft seat and an intermediate shaft; wherein the intermediate shaft passes through the first anti-escape cover, the roller, the first friction plate, the loading spring, the second friction plate, the second anti-escape cover and the lower bracket in sequence; one end of the intermediate shaft is connected to the intermediate shaft seat, and the other end of the intermediate shaft is connected to the nut; the first anti-escape cover is connected to one wall surface of the roller, and the second anti-escape cover is connected to the other wall surface of the roller; the wire blocking column is connected to the lower bracket.

[0009] In the above-mentioned friction guide mechanism, the guide rope wheel assembly includes a first rope wheel shaft, a rope wheel and a bracket; wherein the rope wheel is arranged in the middle part of the bracket through the first rope wheel shaft; and the bottom end of the bracket is connected to the first blanket surface.

[0010] In the above-mentioned friction guide mechanism, the rope winding wheel assembly includes a rope winding wheel seat, a rope winding wheel and a second rope winding wheel shaft; wherein the rope winding wheel is connected to the rope winding wheel seat through the second rope winding wheel shaft; and the rope winding wheel seat is connected to the second blanket surface.

[0011] In the above-mentioned friction guiding mechanism, there are multiple wire blocking posts.

[0012] In the above-mentioned friction guide mechanism, the plurality of wire blocking posts are evenly distributed along the circumferential direction of the lower bracket.

[0013] In the above-mentioned friction guide mechanism, the number of the rope wheels is two, the number of the first rope wheel shafts is two; and the two rope wheels are arranged along the length direction of the bracket.

[0014] In the above-mentioned friction guide mechanism, one end of the loading spring is pressed against the first friction plate, and the other end of the loading spring is pressed against the second friction plate.

[0015] In the above-mentioned friction guide mechanism, the pressure P between the first friction plate and the first anti-escape cover is obtained by the following formula:

[0016]

[0017] Wherein, F is the pressure of the loading spring, R1 is the inner diameter of the first friction plate, and R2 is the outer diameter of the first friction plate.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] (1) The liquid damper used in the traditional solar wing can only achieve a rotation range of less than 360° due to the structure, which is difficult to meet the working conditions of the flexible solar wing deployed over a large area. The friction resistance device of the present invention is a rotational friction device that can achieve multiple turns of rotation;

[0020] (2) The liquid damper has a fixed damping force. The resistance of the friction resistor of the present invention is achieved by pressing the two friction plates together through a spring, and the resistance is generated by the friction coefficient between the materials. Therefore, the friction force generated can be effectively adjusted by replacing the materials of the spring and the friction plate;

[0021] (3) The friction resistor of the present invention has a simple structure and is much lighter than a liquid damper while providing resistance.

[0022] (4) The friction guide mechanism of the present invention integrates the resistance source and the guide device, and has a simple and reliable structure. The mechanism itself can be used for various ropes used in space, such as Kevlar ropes and wire ropes, and can meet different environmental working conditions and tension requirements;

[0023] (5) The present invention can adjust the resistance torque of the friction damper by adjusting the pressure of the loading spring;

[0024] (6) There is no friction during the rotation of the rope wheel assembly of the present invention. By adjusting the length of the rope on the rope wheel, the initial process of the solar wing deployment is free of resistance, which is conducive to the deployment of the solar wing in the initial stage;

[0025] (7) The friction guide mechanism of the present invention is a flexible mechanism that conducts electricity through ropes. By changing or adding multiple guide components, the application of resistance in different deployment modes can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0027] Figure 1 is a schematic diagram of folding a solar wing provided with a friction-type guiding mechanism provided in an embodiment of the present invention;

[0028] Figure 2 is a schematic diagram of unfolding a solar wing provided with a friction-type guiding mechanism provided in an embodiment of the present invention;

[0029] FIG3( a ) is a schematic structural diagram of a friction resistor provided in an embodiment of the present invention;

[0030] FIG3( b ) is another schematic diagram of the structure of the friction resistor provided by an embodiment of the present invention;

[0031] FIG3( c ) is another schematic structural diagram of the friction resistor provided by an embodiment of the present invention;

[0032] FIG3( d ) is another schematic diagram of the structure of the friction resistor provided by an embodiment of the present invention;

[0033] FIG4( a) is a schematic structural diagram of a guide rope pulley assembly provided in an embodiment of the present invention;

[0034] FIG4( b ) is another schematic structural diagram of the guide rope pulley assembly provided in an embodiment of the present invention;

[0035] FIG4( c ) is another schematic structural diagram of the guide rope pulley assembly provided in an embodiment of the present invention;

[0036] FIG5( a ) is a schematic structural diagram of a rope winding wheel assembly provided in an embodiment of the present invention;

[0037] FIG5( b ) is another schematic structural diagram of the rope winding wheel assembly provided in an embodiment of the present invention;

[0038] FIG5( c ) is another schematic structural diagram of the rope winding wheel assembly provided in an embodiment of the present invention;

[0039] Figure 5(d) is another structural schematic diagram of the rope winding wheel assembly provided in an embodiment of the present invention;. DETAILED DESCRIPTION

[0040] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to be able to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0041] Figure 1 is a schematic diagram of folding a solar wing provided with a friction-type guiding mechanism provided in an embodiment of the present invention; Figure 2 FIG. 1 is a schematic diagram of the deployment of a solar wing provided with a friction-type guiding mechanism according to an embodiment of the present invention. Figure 1 and Figure 2 As shown, the friction type guiding mechanism comprises: a friction resistor 1, a guide rope wheel assembly 2 and a rope winding wheel assembly 3; wherein the friction resistor 1 and the guide rope wheel assembly 2 are arranged on a first blanket surface 4; the rope winding wheel assembly 3 is arranged on a second blanket surface 5; the rope of the friction resistor 1 is wound on the rope winding wheel assembly 3 through the guide rope wheel assembly 2. The first blanket surface 4 and the second blanket surface 5 are adjacent.

[0042] The friction resistor 1 provides damping force through Kevlar rope or steel wire rope, the guide pulley assembly 2 is used to guide and prevent the rope from escaping, and the rope winding pulley assembly 3 can store part of the rope in advance to realize the empty part in the initial stage of deployment. At the same time, the rope fixed end serving as the outer end and the friction resistor 1 complete the function of applying resistance at both ends of the solar wing deployment.

[0043] As shown in Figures 3(a), 3(b), 3(c) and 3(d), the friction resistor 1 includes a roller 1-1, a lower bracket 1-2, a first friction plate 1-31, a second friction plate 1-32, a loading spring 1-4, a wire blocking column 1-5, a first anti-escape cover 1-61, a second anti-escape cover 1-62, an intermediate shaft seat 1-7 and an intermediate shaft 1-8; wherein the intermediate shaft 1-8 passes through the first anti-escape cover 1-61, the roller 1-1, the first friction plate 1-31, the loading spring 1-4, the second friction plate 1-32, the second anti-escape cover 1-62 and the lower bracket 1-2 in sequence; one end of the intermediate shaft 1-8 is connected to the intermediate shaft seat 1-7, and the other end of the intermediate shaft 1-8 is connected to the nut; the first anti-escape cover 1-61 is connected to one wall of the roller 1-1, and the second anti-escape cover 1-62 is connected to the other wall of the roller 1-1; the wire blocking column 1-5 is connected to the lower bracket 1-2. There are multiple wire blocking posts 1-5. Multiple wire blocking posts 1-5 are evenly distributed along the circumferential direction of the lower bracket 1-2. One end of the loading spring 1-4 is pressed against the first friction plate 1-31, and the other end of the loading spring 1-4 is pressed against the second friction plate 1-32.

[0044] Place the first anti-escape cover 1-61, the roller 1-1, the first friction plate 1-31, the loading spring 1-4, the second friction plate 1-32, the second anti-escape cover 1-62 and the lower bracket 1-2 in order from left to right, and the intermediate shaft 1-8 passes through in sequence; use screws to securely fix the anti-escape covers on both sides to the roller 1-1. Fix one end of the rope to the roller 1-1 and wind it into shape. Then fix the four wire blocking columns 1-5 to the lower bracket 1-2, and then assemble them with the intermediate shaft 1-8, add gaskets and nuts on top to form a whole, and tighten the intermediate shaft seat 1-7 from the other side of the intermediate shaft 1-8 through threads to complete the assembly of the friction resistor.

[0045] The friction resistor 1 applies pressure to the upper and lower friction plates by the loading spring 1-4, so that the friction plates and the upper and lower anti-escape covers are closely fitted, and the two friction plates are fixed to the intermediate shaft 1-8. The rope is wound on the drum 1-1, and the drum 1-1 and the two anti-escape covers are fixed together by bolts, and the anti-escape covers and the intermediate shaft 1-8 are in a relative rotation relationship. When the rope is unrolled, it is pulled out to drive the drum 1-1 to rotate, and at this time, the anti-escape cover fixed to it begins to rotate with the friction plate and generate friction.

[0046] As shown in Fig. 4(a), Fig. 4(b) and Fig. 4(c), the guide sheave assembly 2 comprises a first sheave shaft 2-1, a sheave 2-2 and a bracket 2-3; wherein the sheave 2-2 is arranged in the middle of the bracket 2-3 through the first sheave shaft 2-1; the bottom end of the bracket 2-3 is connected to the first blanket surface 4. There are two sheaves 2-2 and two first sheave shafts 2-1; the two sheaves 2-2 are arranged along the length direction of the bracket 2-3.

[0047] Place the rope pulley 2-2 in the middle of the bracket 2-3, pass the rope pulley shaft 2-1 through the bracket 2-3 and the rope pulley 2-2 and fix them with nuts to complete the assembly, and the rope extending from the friction resistor passes through the middle of the two rope pulleys 2-2.

[0048] The guide pulley assembly 2 installs the pulley 2-2 on the bracket 2-3 through the pulley shaft 2-1. The pulley 2-2 and the pulley shaft 2-1 are in a relative rotation relationship. After the rope is pulled out from the friction resistor 1, it passes through the gap between the two pulleys 2-2. The pulley 2-2 realizes the guiding and sliding functions of the rope.

[0049] As shown in Figures 5(a), 5(b), 5(c) and 5(d), the rope winding wheel assembly 3 includes a rope winding wheel seat 3-1, a rope winding wheel 3-2 and a second rope winding wheel shaft 3-3; wherein the rope winding wheel 3-2 is connected to the rope winding wheel seat 3-1 through the second rope winding wheel shaft 3-3; and the rope winding wheel seat 3-1 is connected to the second blanket surface 5.

[0050] The sheave shaft 3-3 is passed through the rope winding wheel 3-2 and tightened on the rope wheel seat 3-1 to complete the assembly. After adjusting the rope length, the rope is fixed to the rope winding wheel 3-2, and part of the rope is released from the friction resistor according to the required length of the unfolded idle stroke and wound on the rope winding wheel 3-2. The length of the idle stroke is determined by adjusting the length of the rope wound on the rope winding wheel 3-2.

[0051] The rope pulley assembly 3 installs the rope pulley 3-2 on the rope pulley seat 3-1 through the second rope pulley shaft 3-3. The rope pulley 3-2 and the rope pulley shaft 3-3 are in a relative rotation relationship. The rope is fixed on the rope pulley 3-2, and in the process of the solar wing deployment, it acts as a fixed fulcrum at the far end and completes the resistance application with the friction resistor 1. During installation, part of the rope can be wound on the rope pulley 3-2 in advance to realize the idle travel function in the initial stage of the solar wing deployment, so as to avoid the influence of the resistance in the initial stage of deployment on the deployment.

[0052] The first friction plate 1-31 and the second friction plate 1-32 are collectively referred to as friction plates, the first anti-escape cover 1-61 and the second anti-escape cover 1-62 are collectively referred to as anti-escape covers, the first friction plate 1-31 and the second friction plate 1-32 are annular structures of the same size, and the friction torque M can be precisely controlled by controlling the stiffness k and the compression amount l of the loading spring 1-4. The pressure between the first friction plate 1-31 and the first anti-escape cover 1-61, and the pressure between the second friction plate 1-32 and the second anti-escape cover 1-62 are both:

[0053]

[0054] Among them, F is the pressure of the loading spring 1-4 F=k×l, R1 is the inner diameter of the friction plate ring, and R2 is the outer diameter of the friction plate ring.

[0055] Take a micro-annular zone at a distance r from the center of the circle, with a radial width of dr. The positive pressure received by the micro-annular zone is:

[0056]

[0057] The friction force of the infinitesimal annular belt is:

[0058]

[0059] μ is the friction coefficient between the first friction plate 1-31 and the first anti-escape cover 1-61, and the friction coefficient between the second friction plate 1-32 and the second anti-escape cover 1-62 is the same.

[0060] The friction torque of the infinitesimal annular belt is:

[0061]

[0062] Integrating dM gives the friction torque M:

[0063]

[0064] Effect: The guiding mechanism components can be designed according to the different sizes of flexible solar wings to obtain different resistance moments, achieve good and constant resistance to ensure the tension of the blanket surface, and ensure that the blanket surface can remain taut during the unfolding process.

[0065] The resistance torque adjustment parameters are:

[0066] (1) Select different materials to process the first friction plate 1-31 and the first anti-escape cover 1-61 to achieve different friction coefficients μ;

[0067] (2) Designing the inner diameter R1 and outer diameter R2 of the first friction plate 1-31;

[0068] (3) Design the stiffness k and compression l of loading springs 1-4.

[0069] This embodiment is a device for providing blanket surface tension when the flexible solar wing is unfolded, and can also be used as a reference for devices that need to provide a small amount of friction to assist movement.

[0070] The friction resistor of the present embodiment is a rotational friction that can achieve multiple turns of rotation; the resistance of the friction resistor of the present embodiment is achieved by pressing two friction plates together through a spring, and the resistance is generated by the friction coefficient between the materials. Therefore, the friction force generated can be effectively adjusted by replacing the materials of the spring and the friction plate; the friction resistor of the present embodiment has a simple structure, and under the premise of providing resistance, its weight is much lighter than that of a liquid damper; the friction guide mechanism of the present embodiment integrates the resistance source and the guide device, and has a simple and reliable structure, and the mechanism itself can be used for various ropes used in space such as Kevlar ropes and wire ropes, which can meet different environmental working conditions and tension requirements; the resistance torque of the friction damper can be adjusted by adjusting the pressure of the loading spring; there is no friction during the rotation of the rope wheel assembly of the present embodiment, and the length of the rope wound on the rope wheel can be adjusted to make the initial process of the solar wing unfolding without resistance, which is beneficial to the initial stage of the unfolding of the solar wing; the friction guide mechanism of the present embodiment is a flexible mechanism conducted by ropes, and the application of resistance in different unfolding modes can be achieved by changing or adding multiple guide components.

[0071] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A friction guide mechanism, characterized in that include: A friction resistor (1), a guide rope wheel assembly (2) and a rope winding wheel assembly (3); wherein: The friction resistor (1) and the guide rope pulley assembly (2) are arranged on a first carpet surface (4); The rope winding wheel assembly (3) is arranged on the second carpet surface (5); The rope of the friction resistor (1) is wound around the rope winding wheel assembly (3) through the rope guide wheel assembly (2).

2. The friction guide mechanism according to claim 1, characterized in that: The first carpet surface (4) and the second carpet surface (5) are adjacent to each other.

3. The friction guide mechanism according to claim 1, characterized in that: The damping force provided by the friction resistor (1) is transmitted through the rope; the guide rope wheel assembly (2) is used to guide and prevent the rope from escaping; and the rope winding wheel assembly (3) serves as a fixed end of the rope.

4. The friction guide mechanism according to claim 1, characterized in that: The friction resistor (1) comprises a roller (1-1), a lower bracket (1-2), a first friction plate (1-31), a second friction plate (1-32), a loading spring (1-4), a wire blocking column (1-5), a first anti-escape cover (1-61), a second anti-escape cover (1-62), an intermediate shaft seat (1-7) and an intermediate shaft (1-8); wherein: The intermediate shaft (1-8) sequentially passes through the first anti-escape cover (1-61), the roller (1-1), the first friction plate (1-31), the loading spring (1-4), the second friction plate (1-32), the second anti-escape cover (1-62) and the lower bracket (1-2); One end of the intermediate shaft (1-8) is connected to the intermediate shaft seat (1-7), and the other end of the intermediate shaft (1-8) is connected to a nut; The first anti-escape cover (1-61) is connected to one wall surface of the drum (1-1), and the second anti-escape cover (1-62) is connected to another wall surface of the drum (1-1); The wire blocking column (1-5) is connected to the lower support (1-2).

5. The friction guide mechanism according to claim 1, characterized in that: The guide rope pulley assembly (2) comprises a first rope pulley shaft (2-1), a rope pulley (2-2) and a bracket (2-3); wherein: The rope wheel (2-2) is arranged in the middle of the bracket (2-3) through the first rope wheel shaft (2-1); The bottom end of the bracket (2-3) is connected to the first carpet surface (4).

6. The friction guide mechanism according to claim 1, characterized in that: The rope winding wheel assembly (3) comprises a rope wheel seat (3-1), a rope winding wheel (3-2) and a second rope wheel shaft (3-3); wherein: The rope winding wheel (3-2) is connected to the rope wheel seat (3-1) via the second rope wheel shaft (3-3); The rope pulley seat (3-1) is connected to the second carpet surface (5).

7. The friction guide mechanism according to claim 4, characterized in that: The number of the wire blocking posts (1-5) is multiple; A plurality of wire blocking columns (1-5) are evenly distributed along the circumferential direction of the lower bracket (1-2).

8. The friction guide mechanism according to claim 5, characterized in that: The number of the rope wheels (2-2) is two, and the number of the first rope wheel shafts (2-1) is two; The two rope wheels (2-2) are arranged along the length direction of the support (2-3).

9. The friction guide mechanism according to claim 4, characterized in that: One end of the loading spring (1-4) is pressed against the first friction plate (1-31), and the other end of the loading spring (1-4) is pressed against the second friction plate (1-32).

10. The friction guide mechanism according to claim 4 or 9, characterized in that: The pressure P between the first friction plate (1-31) and the first anti-escape cover (1-61) is obtained by the following formula: Wherein, F is the pressure of the loading spring (1-4), R1 is the inner diameter of the first friction plate, and R2 is the outer diameter of the first friction plate.

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