CN111911797A - Composite rectangular beam structure and manufacturing method thereof - Google Patents

Abstract

The invention discloses a composite material rectangular beam structure and a manufacturing method thereof, wherein the composite material rectangular beam structure comprises an inner winding layer wound on the periphery of a rectangular mould, a plurality of circles of middle pultrusion layers are arranged on the periphery of the inner winding layer, a circle of inner winding layer is arranged between every two adjacent middle pultrusion layers, and a circle of outer winding layer is wound on the periphery of the middle pultrusion layer on the outermost side; the middle pultrusion layer is formed by splicing and combining a plurality of pultrusion plates and four fillet plates, the materials of the inner winding layer, the middle pultrusion layer and the outer winding layer are all made of fiber reinforced resin matrix composite materials, the method improves the axial elastic modulus of the rectangular beam by embedding the middle pultrusion layer in the middle of the wall thickness of the rectangular beam, and simultaneously, the inner layer and the outer layer of the rectangular beam are wound in the circumferential direction by combining spiral winding, so that the circumferential strength and the torsion resistance are ensured; the composite rectangular beam has small bending deformation, can be applied to engineering mechanical arm structural members, has stable movement, and improves the stability and the safety of a mechanism.

Description

A composite material rectangular beam structure and its manufacturing method

technical field

The invention relates to the field of insulating aerial work vehicles, in particular to a composite material rectangular beam structure and a manufacturing method thereof.

Background technique

Insulated aerial work vehicles have been widely used in the field of live work in power systems. The insulating arms are mostly made of glass fiber reinforced resin-based composite materials, which are wound into cylindrical or rectangular cross-section structures, with light weight, high mechanical strength, and insulating properties. Good, strong hydrophobicity and other advantages. The telescopic insulating boom with rectangular section is the most widely used in aerial work vehicles. However, as the length of the telescopic insulating boom becomes longer and longer, the bending load and torsional load become larger and larger. In order to ensure the smoothness of the telescopic boom, the deformation of the telescopic boom must be Controlling within a reasonable range puts forward higher requirements on the bending stiffness of the insulating arm.

The cross-sectional size of the insulating arms is often limited, and it becomes very critical to improve the flexural stiffness (EI) of the rectangular cross-section through reasonable ply design. Although the small-angle helical winding can improve the elastic modulus (E) of the axial material, the performance of the material is still limited. At the same time, the nonlinear length at both ends of the small-angle helical winding is relatively long, and the material waste is relatively large. The composite material sheet prepared by pultrusion process has high modulus in length direction, but poor hoop performance. Therefore, combined with the pultrusion process and the winding process, the performance of the rectangular insulating arm can be effectively improved through a reasonable layer design, taking into account the axial stiffness and hoop strength.

SUMMARY OF THE INVENTION

In view of the above-mentioned technical deficiencies, the purpose of the present invention is to provide a composite rectangular beam structure and a manufacturing method thereof, which can effectively improve the axial stiffness of the rectangular beam by burying a pre-prepared intermediate pultrusion layer in the middle of the wall thickness, At the same time, the inner and outer winding layers provide the hoop strength and torsional resistance of the structure.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions:

The invention provides a composite material rectangular beam structure and a manufacturing method thereof, comprising an inner winding layer wound around the periphery of a rectangular mold, the inner winding layer is provided with several intermediate pultrusion layers on the periphery, and the innermost intermediate pultrusion layer is tightened On the inner winding layer, a circle of inner winding layers is compressed between two adjacent middle pultrusion layers; a circle of outer winding layers is wound around the outermost middle pultrusion layer, and the middle pultrusion layer is composed of several layers. A pultruded board and four rounded boards are assembled and assembled, and the materials of the inner winding layer, the middle pultrusion layer and the outer winding layer are all selected from fiber-reinforced resin-based composite materials.

Preferably, the fiber in the fiber-reinforced resin-based composite material is glass fiber or carbon fiber, and the resin in the fiber-reinforced resin-based composite material is selected from one or more of epoxy resin, vinyl ester resin or unsaturated polyester resin.

Preferably, the thickness of the intermediate pultrusion layer accounts for 1/4 to 2/3 of the total thickness of the rectangular beam structure.

Preferably, the thickness of the inner winding layer accounts for 1/4-2/3 of the total thickness of the rectangular beam structure.

Preferably, the thickness of the outer winding layer accounts for 1/6 to 1/3 of the total thickness of the rectangular beam structure.

The present invention also provides a method for manufacturing the above-mentioned composite material rectangular beam structure, which specifically includes the following steps:

S1. Make a number of pultruded boards and a number of fillet boards in advance according to the design requirements; the fillet R1 of the fillet board is designed according to the fillet of the inner winding layer, and the fillet R2 of the fillet board is designed according to the outer winding layer. The length L and width W of the board are designed according to the width and length of the inner winding layer;

S2. The inner winding layer 2 of a certain thickness is wound on the rectangular mold by the method of helical and hoop winding;

S3. After the winding of the inner winding layer is completed, the pre-prepared pultrusion plate and the fillet plate are assembled together to form an intermediate pultrusion layer on the periphery of the inner winding layer, and the gap between the middle pultrusion layer and the inner winding layer is filled with resin glue liquid;

S4. According to the overall thickness of the rectangular beam structure, the outer winding layer of a certain thickness is wound around the periphery of the middle pultruded layer by a spiral combined hoop winding method;

S5. After the winding is completed in step S4 and the solidification process is completed, a high-rigidity composite rectangular beam is obtained.

The beneficial effects of the present invention are as follows: the composite rectangular beam prepared by the present invention improves its axial elastic modulus by burying an intermediate pultrusion layer in the middle of the wall thickness of the rectangular beam, and meanwhile, the inner and outer layers of the rectangular beam adopt helical winding combined with hoop winding. , to ensure the hoop strength and torsion resistance; the rectangular beam of the composite material has small bending deformation and can be applied to structural parts of engineering manipulators, and its movement is stable, which improves the stability and safety of the mechanism.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

1 is a schematic structural diagram of a composite material rectangular beam structure provided by an embodiment of the present invention;

2 is a schematic structural diagram of a rounded plate provided by an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a pultruded sheet provided by an embodiment of the present invention.

Description of reference numbers:

1. Rectangular mould; 2. Inner winding layer; 31. Pultrusion plate; 32. Rounded plate; 4. Outer winding layer.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in FIG. 1 to FIG. 3, a composite rectangular beam structure and a manufacturing method thereof include an inner winding layer 2 wound around the periphery of a rectangular mold 1, and an intermediate pultrusion layer is compressed on the periphery of the inner winding layer 2, so The outer periphery of the middle pultrusion layer is wound with a circle of outer winding layers 4; the middle pultrusion layer is assembled and assembled by several pultrusion plates 31 and four rounded plates 32, and the inner winding layer 2, the middle pultrusion layer The materials of the layer and the outer winding layer 4 are fiber-reinforced resin-based composite materials.

The fiber in the fiber-reinforced resin-based composite material is selected from glass fiber or carbon fiber, and the resin in the fiber-reinforced resin-based composite material is selected from one or more of epoxy resin, vinyl ester resin or unsaturated polyester resin.

The thickness of the intermediate pultrusion layer accounts for 1/4 to 2/3 of the total thickness of the rectangular beam structure.

The thickness of the inner winding layer 2 accounts for 1/4-2/3 of the total thickness of the rectangular beam structure.

The thickness of the outer winding layer 4 accounts for 1/6 to 1/3 of the total thickness of the rectangular beam structure.

The present embodiment also provides a method for manufacturing the above-mentioned composite material rectangular beam structure, which specifically includes the following steps:

S1. According to the design requirements, make a number of pultruded plates 31 and a number of fillet boards 32 in advance; the fillet R1 of the fillet board 32 is designed according to the fillet of the inner winding layer 2, and the fillet R2 of the fillet board 32 is designed according to the external winding Layer 4 design, the length L and width W of the pultruded sheet 31 are designed according to the width and length of the inner winding layer 2;

S2, winding the inner winding layer 2 of a certain thickness on the rectangular mold 1 by using a spiral combined hoop winding method;

S3. After the winding of the inner winding layer 2 is completed, the pre-prepared pultruded plate 31 and the fillet plate 32 are assembled together to form an intermediate pultruded layer on the periphery of the inner winding layer 2, and the gap between the middle pultruded layer and the inner winding layer 2 is formed. Fill in resin glue;

S4. According to the overall thickness of the rectangular beam structure, the outer winding layer 4 of a certain thickness is wound around the periphery of the middle pultruded layer by a spiral combined hoop winding method;

S5. After the winding is completed in step S4 and the solidification process is completed, a high-rigidity composite rectangular beam is obtained.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Thus, provided that these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims (6)

1. The composite rectangular beam structure is characterized by comprising an inner winding layer (2) wound on the periphery of a rectangular die (1), wherein a plurality of middle pultrusion layers are arranged on the periphery of the inner winding layer (2), the innermost middle pultrusion layer is tightly pressed on the inner winding layer (2), and a circle of inner winding layer (2) is tightly pressed between every two adjacent middle pultrusion layers; the setting has round outer winding layer (4) at outermost middle pultrusion layer periphery winding, middle pultrusion layer is assembled the combination by a plurality of pultrusion board (31) and four round angle board (32) and is formed, fibre reinforced resin base combined material is all chooseed for use to the material of interior winding layer (2), middle pultrusion layer and outer winding layer (4).

2. A rectangular beam structure of composite material according to claim 1, wherein the fibers in said fiber-reinforced resin-based composite material are glass fibers or carbon fibers, and the resin in said fiber-reinforced resin-based composite material is one or more of epoxy resin, vinyl ester resin or unsaturated polyester resin.

3. The rectangular composite beam structure of claim 1, wherein the thickness of the intermediate pultruded layer is 1/4-2/3 of the total thickness of the rectangular beam structure.

4. A rectangular beam structure of composite material according to claim 1, wherein the thickness of said inner wrap (2) is 1/4-2/3 of the total thickness of the rectangular beam structure.

5. A rectangular beam structure of composite material according to claim 1, wherein the thickness of the outer wrap (4) is 1/6-1/3 of the total thickness of the rectangular beam structure.

6. A method for manufacturing a rectangular beam structure of composite material according to any one of claims 1 to 5, comprising the following steps:

s1, manufacturing a plurality of pultruded panels (31) and a plurality of circular angle panels (32) according to design requirements; the fillet R1 of the round plate (32) is designed according to the excircle corner of the inner winding layer (2), the excircle corner R2 of the round plate (32) is designed according to the outer winding layer (4), and the length L and the width W of the pultrusion plate (31) are designed according to the width and the length of the inner winding layer (2);

s2, winding an inner winding layer (2) with a certain thickness on the rectangular mould 1 in a spiral combined hoop winding mode;

s3, after the inner winding layer (2) is wound, combining and assembling a pultrusion plate (31) and a circular angle plate (32) which are prepared in advance on the periphery of the inner winding layer (2) to form a middle pultrusion layer, and filling resin glue solution into a gap between the middle pultrusion layer and the inner winding layer (2);

s4, winding an outer winding layer (4) with a certain thickness in a spiral combined hoop winding mode at the periphery of the middle pultrusion layer according to the total thickness of the rectangular beam structure;

s5, and after the winding is finished in the step S4, the rectangular beam made of the high-rigidity composite material is obtained after the rectangular beam is completely cured through a curing process.

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