Rotor arm and glass fiber laying method for rotor arm

Abstract

The present invention relates to the technical field of helicopter rotor arms, and discloses a rotor arm and a glass fiber laying method for the rotor arm. The blade body comprises a blade body; the blade body comprises a leading edge laying layer, a middle laying layer and a terminal laying layer, and the leading edge laying layer, the middle laying layer and the terminal laying layer comprise an outer reinforcement layer and an inner reinforcement layer. By dividing the blade into three areas, synchronous laying operations can be performed on different areas at the same time, thereby improving the laying efficiency of the blade and reducing the laying time. The laying operations between multiple areas do not interfere with each other, thereby improving the laying effect of the blade. By setting a stacking laying method, multiple pre-stacked glass fiber layers can be laid and placed during the laying work, thereby simplifying the laying process of several layers of glass fiber, shortening the laying time, and improving production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of helicopter rotor arms, in particular to a rotor arm and a glass fiber laying method for the rotor arm. Background Art

[0002] When a helicopter rotor is in operation, the blades will generate a large centrifugal force. In addition to the torsion bar bearing most of the centrifugal force, the rotor arm also bears a part of the centrifugal force. In order to ensure that the overall weight of the fuselage is reduced, the rotor arm is mostly made of composite material structure. However, the stress condition of this part is complex and requires a reasonable layup structure to meet the stress requirements. Summary of the Invention

[0003] (1) Technical problems solved

[0004] In view of the deficiencies in the prior art, the present invention provides a rotor arm and a glass fiber laying method for the rotor arm.

[0005] (2) Technical solution

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a rotor arm, comprising a blade body;

[0007] The blade body includes a leading edge laying layer, a middle laying layer and a terminal laying layer, and the leading edge laying layer, the middle laying layer and the terminal laying layer include an outer strengthening layer and an inner reinforcing layer.

[0008] Preferably, the leading edge paving layer and the terminal paving layer are both columnar structures, and the cross-sectional size of the leading edge paving layer is larger than the cross-sectional size of the terminal paving layer.

[0009] Preferably, part mounting holes are symmetrically provided at the end of the leading edge paving layer, and inner cavities are provided inside the leading edge paving layer, the middle paving layer and the end paving layer.

[0010] Preferably, the middle paving layer is a conical structure, and the structures at both ends of the middle paving layer correspond to the structures of the leading edge paving layer and the tail paving layer respectively.

[0011] Preferably, the angles between the middle paving layer, the leading edge paving layer and the end paving layer are all between 0-10°.

[0012] Preferably, the inner reinforcement layer is formed by laying out a plurality of glass fibers, and the thickness of the glass fibers is 8 mm to 12 mm.

[0013] A method for laying glass fiber layers for a rotor arm comprises the following steps:

[0014] S1. Partition the blade body;

[0015] S2, stacking multiple layers of glass fiber on top of each other;

[0016] S3. Lay the leading edge and terminal layers, laying 12-20 layers of fiberglass on top of the lower outer reinforcement layer, and after the laying is completed, lay the upper outer reinforcement layer on top of the fiberglass;

[0017] S4. Lay the middle laying layer, overlap the glass fiber on the leading edge laying layer and the inner side of the terminal laying layer laid in S3, and lay the outer reinforcement layer on the top of the glass fiber to complete the laying process of the middle laying layer.

[0018] Preferably, in step S4, the glass fibers are laid progressively in a staggered manner, with a staggered spacing of 70 mm between the glass fibers, and the angles between the middle laying layer and the leading edge laying layer and the end laying layer can be adjusted and controlled by the staggered spacing.

[0019] (3) Beneficial effects

[0020] Compared with the prior art, the present invention provides a rotor arm and a glass fiber laying method for the rotor arm, which has the following beneficial effects:

[0021] 1. A rotor arm and a glass fiber laying method for a rotor arm can perform synchronous laying operations on different areas by dividing the blades into three areas, thereby improving the laying efficiency of the blades and reducing the laying time. The laying operations between multiple areas do not interfere with each other, thereby improving the laying effect of the blades.

[0022] 2. The rotor arm and the glass fiber laying method of the rotor arm can lay and place multiple pre-stacked glass fiber layers during the laying work through the stacking laying method, thereby simplifying the laying process of several layers of glass fiber, shortening the laying time, and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 It is a schematic diagram of the structure of the present invention;

[0025] Figure 2 Schematic diagram of the internal structure of the present invention;

[0026] Figure 3 It is a cross-sectional schematic diagram of the present invention;

[0027] Figure 4 This is an enlarged schematic diagram of point A of the present invention;

[0028] Figure 5 It is a main schematic diagram of the present invention;

[0029] Figure 6 It is a schematic diagram of the process of the present invention.

[0030] In the figure: 1. Blade body; 2. Leading edge laying layer; 3. Middle laying layer; 4. End laying layer; 5. Part mounting hole; 6. Inner cavity; 201. Outer reinforcement layer; 202. Inner reinforcement layer. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] Example 1

[0033] like Figure 1-5 As shown, the present invention provides a rotor arm and a glass fiber laying method for a rotor arm, wherein the rotor arm includes a blade body 1; the blade body 1 includes a leading edge laying layer 2, a middle laying layer 3 and a terminal laying layer 4, the leading edge laying layer 2, the middle laying layer 3 and the terminal laying layer 4 including an outer reinforcement layer 201 and an inner reinforcement layer 202; the leading edge laying layer 2 and the terminal laying layer 4 are both cylindrical structures, and the cross-sectional dimension of the leading edge laying layer 2 is larger than the cross-sectional dimension of the terminal laying layer 4; the middle laying layer 3 is a conical structure, and the structures at both ends of the middle laying layer 3 correspond to the structures of the leading edge laying layer 2 and the terminal laying layer 4 respectively; the angles between the middle laying layer 3 and the leading edge laying layer 2 and the terminal laying layer 4 are all between 0-10°;

[0034] In this embodiment, the multi-layer glass fiber structure can improve the strength of the blade, so as to meet the complex stress conditions of the rotor arm. At the same time, the blade is divided into three areas, and synchronous laying operations can be performed on different areas at the same time, thereby improving the laying efficiency of the blade and reducing the laying time.

[0035] Example 2

[0036] like Figure 1-5 As shown, based on Example 1, the present invention provides a technical solution: part mounting holes 5 are symmetrically provided at the end of the leading edge paving layer 2, and inner cavities 6 are provided inside the leading edge paving layer 2, the middle paving layer 3 and the end paving layer 4.

[0037] In this embodiment, the efficiency of blade laying can be improved by providing a layered laying structure, and the subsequent parts installation operations can be facilitated by providing the parts installation holes 5 .

[0038] Example 3

[0039] like Figure 1-5 As shown, based on Example 1, the present invention provides a technical solution: the inner reinforcement layer 202 is formed by laying a plurality of glass fibers, and the thickness of the glass fibers is 8mm-12mm.

[0040] In this embodiment, the built-in reinforcement layer can reduce the structural weight while meeting the structural strength requirements. The stacking laying method can lay multiple pre-stacked glass fiber layers during the laying work, thereby simplifying the laying process of several layers of glass fiber, shortening the laying time, and improving production efficiency.

[0041] The working principle of the rotor arm and the glass fiber laying method of the rotor arm will be described in detail below.

[0042] like Figure 1-6 As shown, when in use, the laying operation is performed in the following manner: first, the blade body 1 is partitioned; then multiple layers of glass fiber are stacked on each other; secondly, the leading edge laying layer 2 and the terminal laying layer 4 are laid, and 12-20 layers of glass fiber are laid on the top of the lower outer reinforcement layer 201, and after the laying is completed, the upper outer reinforcement layer 201 is laid on the top of the glass fiber; finally, the middle laying layer 3 is laid, and the glass fiber is overlapped on the inner side of the leading edge laying layer 2 and the terminal laying layer 4 laid in S3, and the outer reinforcement layer 201 is laid on the top of the glass fiber to complete the laying process of the middle laying layer 3. During the laying work of the middle laying layer 3, the glass fiber is laid in a staggered progressive manner, and the staggered spacing between the glass fibers is 70 mm. The angle between the middle laying layer 3 and the leading edge laying layer 2 and the terminal laying layer 4 can be adjusted and controlled by the staggered spacing.

Claims

1. A method for laying glass fiber layers on a rotor arm, the rotor arm comprising a blade body (1), characterized in that: The blade body (1) comprises a leading edge paving layer (2), a middle paving layer (3) and a terminal paving layer (4), wherein the leading edge paving layer (2), the middle paving layer (3) and the terminal paving layer (4) comprise an outer reinforcement layer (201) and an inner reinforcement layer (202); A method for laying out glass fiber for a rotor arm comprises the following steps: S1, partitioning the blade body (1); S2, stacking multiple layers of glass fiber on top of each other; S3, laying the leading edge laying layer (2) and the terminal laying layer (4), laying 12-20 layers of glass fiber on top of the lower outer reinforcement layer (201), and laying the upper outer reinforcement layer (201) on top of the glass fiber after the laying is completed; S4, laying the middle laying layer (3), overlapping the glass fiber on the inner side of the leading edge laying layer (2) and the end laying layer (4) laid in S3, and laying the outer reinforcement layer (201) on the top of the glass fiber to complete the laying process of the middle laying layer (3); In step S4, the glass fibers are laid in a staggered progressive manner, with the staggered spacing between the glass fibers being 70 mm. The angles between the middle laying layer (3), the leading edge laying layer (2), and the end laying layer (4) can be adjusted and controlled by the staggered spacing.

2. The glass fiber laying method for a rotor arm according to claim 1, characterized in that: The leading edge paving layer (2) and the terminal paving layer (4) are both columnar structures, and the cross-sectional size of the leading edge paving layer (2) is larger than the cross-sectional size of the terminal paving layer (4).

3. The glass fiber laying method for a rotor arm according to claim 1, characterized in that: Parts mounting holes (5) are symmetrically provided at the end of the leading edge paving layer (2), and inner cavities (6) are provided inside the leading edge paving layer (2), the middle paving layer (3), and the end paving layer (4).

4. The glass fiber laying method for a rotor arm according to claim 1, characterized in that: The middle paving layer (3) is a conical structure, and the structures at both ends of the middle paving layer (3) correspond to the structures of the leading edge paving layer (2) and the tail end paving layer (4), respectively.

5. The glass fiber laying method for a rotor arm according to claim 1, characterized in that: The included angles between the middle paving layer (3), the leading edge paving layer (2) and the end paving layer (4) are all between 0° and 10°.

6. The glass fiber laying method for a rotor arm according to claim 1, characterized in that: The inner reinforcement layer (202) is formed by laying a plurality of glass fibers, and the thickness of the glass fibers is 8 mm to 12 mm.

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