Insulation arm, engineering mechanical equipment with insulation arm and preparation method of insulation arm

Abstract

The invention provides an insulating arm, engineering mechanical equipment with the insulating arm and a preparation method of the insulating arm. The insulating arm (1) is made of a hollow tubular insulating composite material formed by fibers impregnated with resin, and is provided with at least one winding unit. The winding unit has a winding unit structure of [alpha] n / [gamma] m / [beta] p, [alpha] n forms a first fiber portion (11) of the insulating arm, [gamma] m forms a second fiber portion (12) of the insulating arm, [beta] p forms a third fiber portion (13) of the insulating arm, [alpha], [gamma], and [beta] are angles of the fibers with respect to an axial direction of the insulating arm, [alpha] is in a range of 0 + / -2 DEG, [gamma] is about + / -45 DEG, and [beta] is in a range of 0 + / -2 DEG. The fiber is wound around the metal core mold, beta is within the range of 90 + / -2 degrees, n is the number of winding layers of the fiber with the angle alpha relative to the axial direction of the metal core mold, m is the number of winding layers of the fiber with the angle gamma relative to the axial direction of the metal core mold, m is an even number, and p is the number of winding layers of the fiber with the angle beta relative to the axial direction of the metal core mold.

Description

Technical Field

[0001] The present disclosure relates to the technical field of engineering machinery and equipment including aerial work vehicles, and in particular to an insulating arm for engineering machinery and equipment and a method for preparing the insulating arm. Background Art

[0002] With the rapid development of infrastructure in recent years, operating heights have grown from a few meters to over ten meters to 25 meters and even higher. This has led to an increasing demand for construction machinery with longer insulated arms, placing higher technical demands on the performance of these arms. In many construction machinery equipped with insulated arms for aerial work, the terminal arm is a telescopic arm. As operating heights continue to increase, the reach of the telescopic arm also increases. To ensure telescopic stability and smooth operation under operating conditions, the bending and torsional stiffness of the insulated arm must be further improved.

[0003] Currently, most insulation arms of engineering machinery are made of glass fiber reinforced resin-based composite materials. Glass fiber has the characteristics of high axial strength and high modulus. However, the arrangement direction of glass fiber in the existing technology makes it difficult to fully utilize the high axial strength and high modulus of glass fiber. Summary of the Invention

[0004] The present disclosure is made in view of the above problems, and its purpose is to provide an insulating arm with higher bending stiffness and torsional stiffness, an engineering machinery equipment having the insulating arm, and a method for preparing the insulating arm.

[0005] In a first aspect, the present application provides an insulating arm, which is a hollow tubular insulating composite material formed by fibers impregnated with resin, and has at least one laying unit, characterized in that:

[0006] The laying unit has a n / γ m / β p The wrapped unit structure, α n The first fiber portion forming the insulating arm, γ m The second fiber portion forming the insulating arm, β p forming a third fiber portion of the insulating arm,

[0007] α, γ, and β are the angles of the fiber relative to the axial direction of the insulating arm, α is in the range of 0±2°, γ is about ±45°, and β is in the range of 90±2°. n is the number of winding layers of the fiber with an angle of α relative to the axial direction of the insulating arm, m is the number of winding layers of the fiber with an angle of γ relative to the axial direction of the insulating arm, and m is an even number. p is the number of winding layers of the fiber with an angle of β relative to the axial direction of the insulating arm.

[0008] According to the insulating arm of the present disclosure, since the laying unit of the insulating arm has α n / γ m / β p The wrapped unit structure, α n The first fiber portion is formed by winding n layers of fibers at an angle of 0±2° relative to the axial direction of the insulating arm. m The second fiber portion is formed by winding m layers of fibers at an angle of about ±45° relative to the axial direction of the insulating arm. p The third fiber portion is formed by winding the p-layer at an angle of approximately 90±2° relative to the axial direction of the insulating arm. The combination of the first and second fiber portions significantly improves the bending and torsional stiffness of the insulating arm while maintaining the same cross-sectional dimensions. Furthermore, the low-angle layup structure, with the first fiber portion roughly parallel to the axial direction, fully utilizes the fiber's high strength and high modulus properties. Compared to the prior art pultruded unidirectional sheet and winding process, the insulating arm disclosed in this disclosure has a higher degree of overall formation.

[0009] In some embodiments, the fibers of the first fiber portion are approximately parallel to the axial direction of the insulating arm; the fibers of the second fiber portion are wound on the outer surface of the first fiber portion at an angle of approximately ±45° relative to the axial direction of the insulating arm; and the fibers of the third fiber portion are wound on the outer surface of the second fiber portion approximately perpendicular to the axial direction of the insulating arm.

[0010] In some embodiments, the number of winding layers of the first fiber portion, the second fiber portion, and the third fiber portion is respectively set according to the required stiffness of the insulating arm.

[0011] In some embodiments, the first fiber portion has 2 to 8 fiber winding layers, the second fiber portion has 2 or 4 fiber winding layers, and the third fiber portion has 1 to 4 fiber winding layers.

[0012] In some embodiments, the fibers are inorganic fibers or polymer fibers.

[0013] In some embodiments, the resin is one of an epoxy resin, a vinyl ester resin, and an unsaturated polyester resin.

[0014] In some embodiments, when the insulating arm has two or more wrapping units, fibers of the first fiber portion of a wrapping unit on the outer side are wrapped around the outer surface of the third fiber portion of another wrapping unit adjacent to the inner side.

[0015] In some embodiments, the number of the wrapping units of the insulating arm is set according to the required stiffness of the insulating arm.

[0016] In a second aspect, the present application provides an engineering machinery device having the insulating arm described in the above embodiments. Since the insulating arm has greatly improved bending and torsional rigidity, the engineering machinery device having the insulating arm can reach a higher working height.

[0017] In a third aspect, the present application provides a method for preparing an insulating arm, characterized by comprising the following steps:

[0018] a preparation process in which a metal core mold is mounted on the lay-and-wind device and resin for impregnating the fibers is prepared;

[0019] The laying and wrapping process, in which α n / γ m / β p The fiber impregnated with resin is wound onto a metal core mold coated with a release agent to form at least one winding unit, wherein α is the angle of the fiber relative to the axial direction of the metal core mold, α is within the range of 0±2°, n is the number of winding layers of the fiber with an angle of α relative to the axial direction of the metal core mold, and α n The first fiber portion of the insulating arm is formed, γ is the angle of the fiber relative to the axial direction of the metal core mold, γ is about ±45°, m is the number of winding layers of the fiber relative to the axial direction of the metal core mold at an angle of γ, and m is an even number, γ m The second fiber portion of the insulating arm is formed, β is the angle of the fiber relative to the axial direction of the metal core mold, β is in the range of 90±2°, p is the number of winding layers of the fiber with an axial angle of β relative to the metal core mold, β p a third fiber portion forming an insulating arm;

[0020] a compaction process, in which the paving structure is compacted and locked;

[0021] a curing step, in which the ply structure compacted in the compacting step is cured;

[0022] A demolding step is performed in which the laminate structure cured in the curing step is demolded.

[0023] According to the preparation method of the insulating arm disclosed in the present invention, since the laying unit of the insulating arm produced by the above preparation method has α n / γ m / β p The wrapped unit structure, α n The first fiber portion is formed by winding n layers of fibers at an angle of 0±2° relative to the axial direction of the insulating arm. mThe second fiber portion is formed by winding m layers of fibers at an angle of about ±45° relative to the axial direction of the insulating arm. p The third fiber portion is formed by winding the p-layer at an angle of approximately 90±2° relative to the axial direction of the insulating arm. The combination of the first and second fiber portions significantly improves the bending and torsional stiffness of the insulating arm while maintaining the same cross-sectional dimensions. Furthermore, the low-angle layup structure, with the first fiber portion roughly parallel to the axial direction, fully utilizes the fiber's high strength and high modulus properties. Compared to the prior art pultruded unidirectional sheet and winding process, the insulating arm disclosed in this disclosure has a higher degree of overall formation.

[0024] In some embodiments, the numbers n, m, and p of winding layers of the first fiber portion, the second fiber portion, and the third fiber portion are respectively set according to the required stiffness of the insulating arm.

[0025] In some embodiments, the first fiber portion has 2 to 8 fiber winding layers, the second fiber portion has 2 or 4 fiber winding layers, and the third fiber portion has 1 to 4 fiber winding layers.

[0026] In some embodiments, the fibers are inorganic fibers or polymer fibers.

[0027] In some embodiments, the resin is one of an epoxy resin, a vinyl ester resin, and an unsaturated polyester resin.

[0028] In some embodiments, when the insulating arm has more than two wrapping units, the fibers of the first fiber portion of the wrapping unit on the relatively outer side are wound around the outer surface of the third fiber portion of another adjacent wrapping unit on the inner side, approximately parallel to the axial direction of the insulating arm.

[0029] In some embodiments, the number of the wrapping units of the insulating arm is set according to the required stiffness of the insulating arm.

[0030] In some embodiments, in the preparation process, the metal core mold is installed on the integrated laying and wrapping equipment, the release agent is evenly brushed on the surface of the metal core mold, and the resin used to impregnate the fiber is pre-injected into the glue tank, so that in the subsequent laying and wrapping process, the fiber is impregnated with the resin through the glue tank.

[0031] In some embodiments, during the compaction process, the wrapped structure is compacted and locked by an outer mold having an inner surface coated with a release agent.

[0032] In some embodiments, during the curing process, the compacted laminate structure together with the outer mold and the metal core mold are moved into an oven for curing.

[0033] In some embodiments, in the demolding process, the cured laminate structure is demolded from the outer mold and the metal core mold.

[0034] In some embodiments, during the laying process, the laying tension is 10% to 25% of the fiber strength.

[0035] According to the above preparation method, the paving structure is compacted and locked by the outer mold with a release agent on the inner surface. Therefore, the paving structure is formed in the paving process. n / γ m / β p The laying and wrapping unit can further improve the bending stiffness and torsional stiffness of the prepared insulating arm. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to denote the same components. In the drawings:

[0037] Figure 1 is a flow chart of a method for preparing an insulating arm disclosed herein;

[0038] Figure 2 is a schematic diagram of a metal core mold used in the method for preparing an insulating arm disclosed herein;

[0039] Figure 3 A layered schematic diagram showing an insulating arm of the present disclosure;

[0040] Figure 4 Schematic diagrams of stiffness testing of the insulating arm of the present invention, wherein (a) is a schematic diagram of bending stiffness testing, and (b) and (c) are schematic diagrams of torsional stiffness testing.

[0041] Description of Reference Numerals

[0042] 1 Insulation arm

[0043] 11. First Fiber Department

[0044] 12 second fiber portion

[0045] 13 Third fiber section

[0046] 2 Metal core mold

[0047] 21 Rotation axis

[0048] 22 core mold part DETAILED DESCRIPTION

[0049] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description and claims of this application are intended to cover non-exclusive inclusions.

[0051] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0052] First, a method for preparing an insulating arm according to the present disclosure is described with reference to the accompanying drawings.

[0053] Figure 1 The flowchart of the method for preparing the insulating arm disclosed herein is as follows. The method disclosed herein utilizes a laying and wrapping integrated device to manufacture the insulating arm, and includes the following steps S1 to S5.

[0054] Step S1 is a preparation step in which a metal core mold is mounted on the lay-winding apparatus and resin for impregnating the fibers is prepared.

[0055] Step S2 is a laying and wrapping step, in which α n / γ m / β p The fiber impregnated with resin is wound onto the core mold portion 22 of the metal core mold 2 coated with a release agent to form at least one winding unit, wherein α, γ, and β are the angles of the fiber relative to the axial direction of the rotating shaft 21 of the metal core mold 2, α is in the range of approximately 0±2°, n is the number of winding layers with the fiber at an angle α relative to the axial direction of the metal core mold 2, and α n The first fiber portion 11 of the insulating arm is formed. That is, the fibers of the first fiber portion 11 are approximately parallel to the axial direction of the metal core mold 2 and are wound in n layers. γ is approximately ±45°, and m is the number of winding layers at an angle γ of the fibers relative to the axial direction of the metal core mold 2. It should be noted that when winding at approximately ±45°, it is necessary to wind the fibers at 45° followed by the fibers at -45°. Therefore, m is an even number, and γ is mThe second fiber portion 12 of the insulating arm is formed. That is, the fibers of the second fiber portion 12 are wound at an angle of approximately ±45° relative to the axial direction of the metal core 2 and are wound in m layers. β is within the range of 90±2°, p is the number of winding layers at an angle of β relative to the axial direction of the metal core 2, and β p The third fiber portion 13 forming the insulating arm, that is, the fibers of the third fiber portion 13 are substantially perpendicular to the axial direction of the metal core mold 2 , and are wound around the p-layer.

[0056] The use of "approximately" in describing the degree range here is to clarify that the angular range is not strictly limited to, for example, "0±2°." An angle slightly larger than this range, such as "0±3°," should also be understood to be within the scope of protection of this invention. Furthermore, "approximately ±45°" refers to an inclination of approximately 45° or -45° relative to the axial direction of the metal core mold 2. An angle slightly larger or smaller than ±45° should also be understood to be within the scope of protection of this invention.

[0057] Step S3 is the compaction step. In this compaction step, the wrapped structure is compacted and locked. Through this step S3, the rubber content and porosity of the fiber can be reduced.

[0058] Step S4 is a curing step in which the ply structure compacted in step S3 is cured.

[0059] Step S5 is a demolding step. In the demolding step, the laminate structure solidified in step S4 is demolded.

[0060] Specifically, in step S1, first, the metal core mold 2 is installed in the laying and wrapping integrated equipment. Figure 2 The metal core mold 2 includes a rotating shaft 21 and a core mold part 22 for winding and laying fibers. In one embodiment of the present disclosure, the core mold part 22 is cylindrical, that is, the cross section of the core mold part 22 is circular. However, the present disclosure is not limited thereto, and the cross section of the core mold part 22 can also be set to a rectangle as needed. The rotating shaft 21 is installed on the winding and laying integrated equipment. The release agent is evenly brushed on the outer surface of the core mold part 22. The resin, curing agent, accelerator, etc. used to impregnate the fibers are pre-injected into the glue tank in a specified proportion through an automatic glue dispensing machine, so that in the subsequent winding and laying process, the fibers are impregnated with the resin through the glue tank. In one embodiment of the present disclosure, the ratio of resin, curing agent, and accelerator is, for example, 100:30:1.5. However, the present disclosure is not limited thereto, and the ratio of resin, curing agent, and accelerator can be appropriately set according to the type of resin, the preparation conditions of the insulating arm, or the functional requirements.

[0061] The fibers used in this disclosure are high-strength, high-modulus inorganic fibers or polymer fibers with excellent insulating properties. For example, one or more of glass fiber, basalt fiber, ultra-high molecular weight polyethylene fiber, and aramid fiber can be used. The resin used in this disclosure can be one of epoxy resin, vinyl ester resin, and unsaturated polyester resin.

[0062] After completing the above preparations, the process proceeds to step S2, which is the laying and wrapping process.

[0063] In one embodiment of the present invention, the fiber is impregnated with resin through a glue tank while being laid around the core mold part 22. A plurality of teeth can be provided at each end of the core mold part 22. In the process of forming the first fiber part 11, when the fiber is laid to the first end of the core mold part 22 parallel to the axial direction of the metal core mold 2, the fiber is laid around the teeth and parallel to the axial direction of the metal core mold 2 to the second end of the core mold part 22. When the fiber reaches the second end of the core mold part 22, the fiber is laid around the teeth and parallel to the axial direction of the metal core mold 2 to the first end of the core mold part 22. This operation is repeated to lay n layers of resin-impregnated fibers between the first end and the second end of the core mold part 22 to form the first fiber part 11. In one embodiment of the present invention, n can be in the range of 2 to 8. However, the number of layers of the first fiber part 11 of the insulating arm of the present invention is not limited thereto and can be appropriately set according to the required stiffness of the insulating arm.

[0064] After forming the first fiber portion 11, the fibers of the second fiber portion 12 begin to be wound. During the formation of the second fiber portion 12, the fibers are laid to the first end of the core mold portion 22 at an angle of approximately 45 degrees relative to the axial direction of the metal core mold 2. After winding around the teeth, the fibers are laid toward the second end of the core mold portion 22 at an angle of approximately 45 degrees relative to the axial direction of the metal core mold 2. When the fibers reach the second end of the core mold portion 22, they are wound around the teeth and laid toward the first end of the core mold portion 22 at an angle of approximately negative 45 degrees relative to the axial direction of the metal core mold 2. In other words, adjacent layers of fibers in the second fiber portion 12 are approximately perpendicular. This process is repeated until m layers of resin-impregnated fibers are laid between the first and second ends of the core mold portion 22, forming the second fiber portion 12. In one embodiment of the present disclosure, m can be 2 or 4. However, the number of layers in the second fiber portion 12 of the insulating arm of the present disclosure is not limited to this number and can be set to another even number depending on the required rigidity of the insulating arm.

[0065] After the second fiber portion 12 is formed, the fibers of the third fiber portion 13 are wound. During the formation of the third fiber portion 13, the fibers are wound onto the core mold portion 22 approximately perpendicularly to the axial direction of the metal core mold 2. P layers of resin-impregnated fibers are wound between the first and second ends of the core mold portion 22 to form the third fiber portion 13. In one embodiment of the present disclosure, p can be in the range of 1 to 4. However, the number of layers of the third fiber portion 13 of the insulating arm of the present disclosure is not limited to this number and can be appropriately set based on the required rigidity of the insulating arm.

[0066] After the winding of the third fiber portion 13 is completed, one laying unit is complete. The insulating arm disclosed herein can be equipped with multiple laying units, depending on the requirements of the insulating arm. When multiple laying units are required, the fibers of the first fiber portion 11 of the outer laying unit are laid approximately parallel to the axial direction of the insulating arm 1 onto the outer surface of the third fiber portion 13 of the adjacent inner laying unit. The number of laying units in the insulating arm can be appropriately determined based on the required stiffness of the insulating arm.

[0067] In one embodiment of the present disclosure, the laying tension can be controlled to be 10% to 25% of the fiber strength.

[0068] After the fiber laying and winding operation is completed, the process proceeds to step S3, which is a compaction process.

[0069] In the compaction process, the wrapped structure is compacted and locked by an outer mold with a release agent coated on the inner surface. Through this process S3, the glue content and porosity of the fiber can be reduced.

[0070] After the compaction operation is completed, the process proceeds to step S4, which is a curing process.

[0071] In the curing process, the laminate structure compacted in step S3, along with the outer mold and metal core mold, is placed in an oven for curing. It should be noted that curing the fibers of the laminate structure disclosed herein is not limited to heat curing, and other methods for curing the fibers may also be used.

[0072] After the curing operation is completed, the process proceeds to step S5. Step S5 is a demolding step.

[0073] In the demolding step, the laminate structure solidified in step S4 is demolded from the outer mold and the metal core mold, and the outer surface of the fiber of the demolded hollow structure is subjected to surface treatment as needed.

[0074] After the above-mentioned multiple processes, the preparation of the high-rigidity composite material insulating arm is completed.

[0075] The disclosed method for preparing the insulating arm utilizes existing integrated laying and winding equipment. The inventors discovered that a simple process, controlling the winding angle, can significantly improve the bending and torsional stiffness of the insulating arm. The disclosed method for preparing the insulating arm offers a simple production process and high control precision, resulting in consistent quality of the prepared insulating arm.

[0076] Refer to the following Figure 3 The insulating arm manufactured by the above-mentioned manufacturing method will be described. Figure 3 A layered schematic diagram of a laying unit of an insulating arm of the present disclosure is shown. 11 is the innermost first fiber portion, 12 is the second fiber portion wrapped around the periphery of the first fiber portion 11 , and 13 is the third fiber portion wrapped around the periphery of the second fiber portion 12 .

[0077] The insulating arm 1 of the present disclosure is a hollow tubular fiber-reinforced resin-based composite material formed by laying and winding fibers impregnated with resin. In one embodiment of the present disclosure, the insulating arm 1 has a laying and winding unit. A laying and winding unit has α n / γ m / β p Wherein, α, γ, and β are the angles of the fiber relative to the axial direction of the metal core mold 2, α is approximately in the range of 0±2°, and n is the number of winding layers with the fiber at an axial angle of α relative to the metal core mold 2. n The first fiber portion 11 of the insulating arm 1 is formed. That is, the fibers of the first fiber portion 11 are approximately parallel to the axial direction of the metal core 2 and are wound in n layers. γ is approximately ±45°, m is the number of winding layers at an angle γ relative to the axial direction of the metal core 2, and γ m The second fiber portion 12 of the insulating arm 1 is formed. That is, the fibers of the second fiber portion 12 are wound at an angle of approximately ±45° relative to the axial direction of the metal core mold 2 and are wound in m layers. It should be noted that m in the present disclosure is an even number. β is within the range of 90±2°, p is the number of winding layers at an angle of β relative to the axial direction of the metal core mold 2, and β p The third fiber portion 13 forming the insulating arm 1 , that is, the fibers of the third fiber portion 13 are substantially perpendicular to the axial direction of the metal core mold 2 , and are wound around the p-layer.

[0078] In short, the insulating arm 1 of one embodiment of the present invention includes: a first fiber portion 11, whose fibers are approximately parallel to the axial direction of the insulating arm 1; a second fiber portion 12, whose fibers are wound on the outer surface of the first fiber portion 11 at an angle of approximately 45° relative to the axial direction of the insulating arm 1; and a third fiber portion 13, whose fibers are wound on the outer surface of the second fiber portion 12 approximately perpendicular to the axial direction of the insulating arm 1.

[0079] In one embodiment of the present disclosure, the first fiber portion 11 has 2 to 8 fiber winding layers, the second fiber portion 12 has 2 or 4 fiber winding layers, and the third fiber portion 13 has 1 to 4 fiber winding layers. However, the present disclosure is not limited thereto, and the number of winding layers of the first fiber portion 11, the second fiber portion 12, and the third fiber portion 13 can be appropriately set based on the required rigidity of the insulating arm 1.

[0080] In the above-mentioned embodiment of the present disclosure, the insulating arm 1 includes a n / γ m / β p The wrapping unit of the wrapping structure is provided, but the present disclosure is not limited thereto. The number of the wrapping units of the insulating arm 1 can be appropriately set according to the required stiffness of the insulating arm 1.

[0081] When the insulating arm 1 has two or more wrapping units, the fibers of the first fiber portion 11 of the relatively outer wrapping unit are wound around the outer surface of the third fiber portion 13 of another inner adjacent wrapping unit substantially parallel to the axial direction of the insulating arm 1 .

[0082] The fibers used in the insulating arm 1 of the present disclosure are high-strength and high-modulus inorganic fibers or polymer fibers with excellent insulating properties, such as one or more of glass fibers, basalt fibers, ultra-high molecular weight polyethylene fibers, and aramid fibers.

[0083] The present disclosure also provides an engineering machinery. The engineering machinery includes aerial work vehicles, excavators, cranes, fire trucks, and the like used in infrastructure projects. The insulating arm used in the engineering machinery may include the insulating arm (1) described above. Thus, the engineering machinery of the present disclosure can perform operations at higher altitudes due to the insulating arm having a higher rigidity.

[0084] In order to illustrate the performance of the insulating arm 1 manufactured by the method for preparing the insulating arm 1 disclosed herein, two embodiments and two comparative examples are given below for comparative description.

[0085] Example 1

[0086] Step 1: Install the metal core mold 2 on the laying and wrapping equipment, and evenly apply the release agent on the surface;

[0087] Step 2: Mix epoxy resin, curing agent, accelerator, etc. in the specified ratio (100:30:1.5) through an automatic glue dispenser and inject them into the glue tank for later use;

[0088] Step 3: The resin-impregnated fiber bundle is laid and wound on the metal core mold through the laying mechanism and the winding mechanism. The fiber is 2400tex E glass fiber; the resin is epoxy resin; the laying tension is controlled at 15% of the fiber strength, and the laying is carried out on the surface of the metal core mold. The laying structure is made with α4 / (±45°)2 / β2 as the repeating unit. The number of repetitions of the repeating unit is calculated to be 4 based on the thickness of the insulating arm 1; the laying angle α is controlled within the range of 0±2° by the automatic laying mechanism; the winding is carried out along the mold axial direction at ±45° by the winding mechanism, combined with the circumferential winding angle β within the range of 90±2°;

[0089] Step 4: After wrapping, the wrapped structure is compacted and locked using an outer mold coated with a release agent on the inner surface to reduce the resin content and porosity.

[0090] Step 5: Move the compacted laminate structure together with the outer mold and the metal core mold 2 into an oven for curing;

[0091] Step 6: Demolding the insulating arm 1 and performing surface post-treatment to complete the preparation of the high-rigidity composite insulating arm reinforced with a glass fiber wrapped structure.

[0092] An insulating arm with a length of 6 m, a cross-sectional size of 230 mm×240 mm, and a thickness of 15 mm was prepared using the method of Example 1.

[0093] Example 2

[0094] The preparation method of the insulating arm 1 of Example 2 is different from that of Example 1 in that the fiber used is 2400tex basalt fiber, and the rest of the process is the same as that of Example 1.

[0095] An insulating arm with a length of 6 m, a cross-sectional size of 230 mm×240 mm, and a thickness of 15 mm was prepared using the method of Example 2.

[0096] Comparative Example 1

[0097] Step 1: Install the metal core mold on the laying and wrapping equipment and evenly apply the release agent on the surface;

[0098] Step 2: Mix epoxy resin, curing agent, accelerator, etc. in the specified ratio (100:30:1.5) through an automatic glue dispenser and inject them into the glue tank for later use;

[0099] Step 3: The resin-impregnated fiber tow is wound around a metal mandrel using a fiber placement mechanism and a winding mechanism. The fiber is 2400 tex E-glass fiber, and the resin is epoxy resin. The winding tension is controlled at 15% of the fiber strength, and the tow is wound around the metal mandrel. Compared to Example 1, the four-layer 0±2° layup is replaced with a ±15° winding angle. The remaining winding structure remains the same as Example 1.

[0100] Step 4: After wrapping, the wrapped structure is compacted and locked using an outer mold coated with a release agent on the inner surface to reduce the resin content and porosity.

[0101] Step 5: Move the compacted laminate structure, along with the outer mold and metal core mold, into an oven for curing;

[0102] Step 6: Demolding the insulating arm and performing surface post-treatment to complete the preparation of the high-rigidity composite insulating arm reinforced with a glass fiber winding structure.

[0103] An insulating arm with a length of 6 m, a cross-sectional size of 230 mm×240 mm, and a thickness of 15 mm was prepared using the method of Comparative Example 1.

[0104] Comparative Example 2

[0105] The preparation method of the insulating arm 1 of Comparative Example 2 is different from that of Comparative Example 1 in that the fiber used is 2400tex basalt fiber, and the rest of the process is the same as that of Comparative Example 1.

[0106] An insulating arm with a length of 6 m, a cross-sectional size of 230 mm×240 mm, and a thickness of 15 mm was prepared using the method of Comparative Example 2.

[0107] The insulating arms prepared by the above-mentioned Example 1, Example 2, Comparative Example 1, and Comparative Example 2 were subjected to a bending test and a torsion test.

[0108] Figure 4 Schematic diagrams of stiffness testing of the insulating arm of the present invention, wherein (a) is a schematic diagram of bending stiffness testing, and (b) and (c) are schematic diagrams of torsional stiffness testing.

[0109] like Figure 4 As shown in (a), a load F1 perpendicular to the insulating arm 1 is applied to the end of the insulating arm 1. Under the action of the load F1, the smaller the change in the height H of the end of the insulating arm 1 is, the greater the bending rigidity of the insulating arm 1 is.

[0110] like Figure 4 As shown in (b), a torsional stiffness test rod is fixed at the end of the insulating arm 1, and the torsional stiffness test rod is perpendicular to the axial direction of the insulating arm 1. Figure 4 (c) is from Figure 4 Schematic diagram of the torsional stiffness test rod viewed from the right side of (b). Figure 4 In (c), a horizontal load F2 is applied to the end of the torsional stiffness test rod. Figure 4 In (b), the angle is perpendicular to the paper and outward. Under the action of load F2, the smaller the torsion angle θ is, the greater the torsional stiffness of the insulating arm 1 is.

[0111] Table 1 below compares the bending stiffness and torsional stiffness of the insulating arms prepared in the examples and comparative examples of the present disclosure.

[0112] Table 1

[0113]

[0114]

[0115] It can be clearly concluded from the test data in the above table that the bending stiffness and torsional stiffness of the insulating arm manufactured by the preparation method of the insulating arm disclosed in the present invention are significantly superior to the bending stiffness and torsional stiffness of the insulating arm manufactured by the preparation method of the comparative example.

[0116] The above-mentioned method for preparing the insulating arm disclosed in the present invention can provide an insulating arm having high bending stiffness and high torsional stiffness and stable quality under the premise of the same cross-sectional size.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. An insulating arm (1), comprising a hollow tubular insulating composite material formed of fibers impregnated with resin, the insulating arm (1) having at least one laying unit, characterized in that: The laying unit has a n / γ m / β p The entangled unit structure, α n The first fiber portion (11) forming the insulating arm (1) is γ m The second fiber portion (12) forming the insulating arm (1) is p forming a third fiber portion (13) of the insulating arm (1), α, γ, and β are the axial angles of the fiber relative to the insulating arm (1), α is in the range of 0±2°, γ is about ±45°, and β is in the range of 90±2°. n is the number of winding layers of the fiber with an axial angle of α relative to the metal core mold, m is the number of winding layers of the fiber with an axial angle of γ relative to the metal core mold, and m is an even number. p is the number of winding layers of the fiber with an axial angle of β relative to the metal core mold.

2. The insulating arm (1) according to claim 1, characterized in that: The fibers of the first fiber portion (11) are substantially parallel to the axial direction of the insulating arm (1); The fibers of the second fiber part (12) are wound around the outer surface of the first fiber part (11) at an angle of about ±45° relative to the axial direction of the insulating arm (1); The fibers of the third fiber portion (13) are wound around the outer surface of the second fiber portion (12) substantially perpendicularly to the axial direction of the insulating arm (1).

3. The insulating arm (1) according to claim 2, characterized in that: The number of winding layers of the first fiber portion (11), the second fiber portion (12) and the third fiber portion (13) is set respectively according to the required rigidity of the insulating arm (1).

4. The insulating arm (1) according to claim 3, characterized in that: The first fiber portion (11) has 2 to 8 fiber winding layers, the second fiber portion (12) has 2 or 4 fiber winding layers, and the third fiber portion (13) has 1 to 4 fiber winding layers.

5. The insulating arm (1) according to claim 1, characterized in that: The fiber is inorganic fiber or polymer fiber.

6. The insulating arm (1) according to claim 1, characterized in that: The resin is one of epoxy resin, vinyl ester resin and unsaturated polyester resin.

7. The insulating arm (1) according to claim 1, characterized in that: When the insulating arm (1) has more than two wrapping units, the fibers of the first fiber portion (11) of the wrapping unit on the outer side are wrapped around the outer surface of the third fiber portion (13) of another wrapping unit adjacent to the inner side.

8. The insulating arm (1) according to claim 7, characterized in that: The number of the wrapping units of the insulating arm (1) is set according to the required rigidity of the insulating arm (1).

9. An engineering machinery equipment, characterized in that: The invention comprises the insulating arm (1) according to any one of claims 1 to 8.

10. A method for preparing an insulating arm, characterized in that: The process includes the following steps: A preparation process, in which a metal core mold is installed on the laying and winding integrated device, and a resin for impregnating the fiber is prepared; The laying and wrapping process, in which α n / γ m / β p The invention relates to a winding unit structure, wherein the fiber impregnated with resin is wound onto a metal core mold (2) with a release agent coated on the surface to form at least one winding unit, wherein α is an angle of the fiber relative to the axial direction of the metal core mold (2), α is in the range of 0±2°, n is the number of winding layers of the fiber relative to the axial direction of the metal core mold (2) at an angle of α, and α is n The first fiber portion (11) of the insulating arm is formed, γ is the angle of the fiber relative to the axial direction of the metal core mold (2), γ is approximately ±45°, m is the number of winding layers of the fiber relative to the axial direction of the metal core mold (2) at an angle of γ, and m is an even number, γ m The second fiber portion (12) of the insulating arm is formed, β is the angle of the fiber relative to the axial direction of the metal core mold (2), β is in the range of 90±2°, p is the number of winding layers of the fiber relative to the axial direction of the metal core mold (2) at an angle of β, β p a third fiber portion (13) forming an insulating arm; A compaction process, in which the lapped structure is compacted and locked; a curing step, in which the ply structure compacted in the compacting step is cured; A demolding step is performed in which the laminate structure cured in the curing step is demolded.

11. The method for preparing the insulating arm according to claim 10, characterized in that: The numbers n, m, and p of winding layers of the first fiber portion (11), the second fiber portion (12), and the third fiber portion (13) are respectively set according to the required rigidity of the insulating arm.

12. The method for preparing the insulating arm according to claim 10, characterized in that: The first fiber portion (11) has 2 to 8 fiber winding layers, the second fiber portion (12) has 2 or 4 fiber winding layers, and the third fiber portion (13) has 1 to 4 fiber winding layers.

13. The method for preparing the insulating arm according to claim 10, characterized in that: The fiber is inorganic fiber or polymer fiber.

14. The method for preparing the insulating arm according to claim 10, characterized in that: The resin is one of epoxy resin, vinyl ester resin and unsaturated polyester resin.

15. The method for preparing the insulating arm according to claim 10, characterized in that: When the insulating arm has more than two wrapping units, the fibers of the first fiber portion (11) of the wrapping unit on the outer side are wound around the outer surface of the third fiber portion (13) of another wrapping unit adjacent to the inner side substantially parallel to the axial direction of the insulating arm.

16. The method for preparing the insulating arm according to claim 15, characterized in that: The number of the wrapping units of the insulating arm is set according to the required rigidity of the insulating arm.

17. The method for preparing an insulating arm according to claim 10, characterized in that: In the preparation process, the metal core mold is installed on the integrated laying and winding equipment, the release agent is evenly brushed on the surface of the metal core mold, and the resin used to impregnate the fiber is pre-injected into the glue tank, so that in the subsequent laying and winding process, the fiber is impregnated with the resin through the glue tank.

18. The method for preparing an insulating arm according to claim 10, characterized in that: In the compaction process, the wrapped structure is compacted and locked by an outer mold with a release agent coated on the inner surface.

19. The method for preparing an insulating arm according to claim 10, characterized in that: In the curing process, the compacted laminate structure together with the outer mold and the metal core mold are moved into an oven for curing.

20. The method for preparing an insulating arm according to claim 10, characterized in that: In the demoulding process, the cured laminate structure is demoulded from the outer mold and the metal core mold.

21. The method for preparing an insulating arm according to claim 10, characterized in that: In the laying process, the laying tension is 10% to 25% of the fiber strength.

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