Insulating boom and preparation method therefor

Abstract

The present application relates to an insulating boom for a telescopic-arm type aerial work vehicle. The insulating boom comprises a fiber matrix and a wear-resistant layer, wherein the wear-resistant layer is wrapped around the surface of the fiber matrix, the wear-resistant layer comprises polyetheretherketone or polyimide, and the bonding strength between the wear-resistant layer and the fiber matrix is greater than 25 MPa. The present application further relates to a preparation method for the insulating boom, and a telescopic-arm type aerial work vehicle comprising the insulating boom.

Description

Insulating boom and method for manufacturing the same

[0001] Cross-reference to related applications

[0002] This application is based on and claims priority to the application with the Chinese application number 202411833470.6 and the filing date of December 12, 2024, the disclosure of which is hereby incorporated by reference in its entirety into this application. TECHNICAL FIELD

[0003] The present application belongs to the field of engineering machinery, and in particular to an insulating boom and a method for manufacturing the same, and further relates to a telescopic boom aerial working truck comprising the insulating boom. BACKGROUND

[0004] The insulating bucket arm truck was initially introduced into the power industry as a special vehicle for intermediate potential operation in places with convenient traffic and complex wiring. With the development of the power industry and the continuous progress of technology, the insulating bucket arm truck has undergone several technical breakthroughs and product upgrades. The operating height has developed from a few meters and tens of meters initially to 25 meters or even higher now, which puts higher technical requirements on the performance of the insulating section of the vehicle main arm. Currently, the last section of the telescopic insulating bucket arm truck is an insulating section with a length of 1-6 meters. Since this section connects the insulating bucket arm, it not only needs to have excellent insulating performance and bending resistance, but also needs to meet the high wear resistance required for telescopic operation.

[0005] As shown in FIG. 1, most of the insulating booms on the market are made of glass fibers as the reinforcing phase and resins as the continuous phase, which are compounded and solidified through a wet winding process. Due to the limitation of the wet winding process, the angle between the fiber arrangement direction and the center axis of the mold is usually more than 5°, which cannot fully utilize the characteristics of high strength and high modulus of the fiber in the axial direction. In terms of insulation, the outer surface is usually sprayed with a gel coat. Although it can provide certain weather resistance, it has poor wear resistance and is easily worn during the telescopic process of the boom, which reduces the insulating performance and requires regular maintenance. SUMMARY

[0006] The present application aims to improve the wear resistance and insulation of the insulating boom, and therefore provides an insulating boom and a telescopic boom aerial working truck, such as an insulating boom for a telescopic boom aerial working truck (e.g., a telescopic boom insulating bucket arm truck), which has good wear resistance and insulation and can solve the problems of poor wear resistance and insufficient insulation performance of the telescopic insulating boom.

[0007] The first aspect of the present application provides an insulating boom comprising a fiber base and a wear-resistant layer, the wear-resistant layer being wrapped on the surface of the fiber base, the wear-resistant layer comprising polyether ether ketone or polyimide, and the bonding strength between the wear-resistant layer and the fiber base being ≥25 MPa.

[0008] The wear-resistant layer of the present application comprises polyether ether ketone or polyimide, which is a material with high insulation and high wear resistance. Therefore, after the wear-resistant layer of the present application is arranged, not only the coating of the gel coat can be reduced, but also the surface wear resistance, impact resistance and anti-throwing performance of the insulating arm support can be improved, the damage of the insulating arm support caused by knocking can be reduced, and the insulating arm support can have excellent insulation performance, better isolate current, and reduce the risk of electric shock and burns.

[0009] The present application also provides a manufacturing method of the insulating arm support of the first aspect, wherein the manufacturing method comprises:

[0010] preparing a fiber matrix precursor;

[0011] wrapping the wear-resistant layer on the fiber matrix precursor and performing film pressing and curing to obtain the insulating arm support.

[0012] The present application relates to an insulating arm support for a telescopic boom aerial working vehicle (for example, a telescopic boom insulating bucket arm vehicle), which is composed of a hollow fiber matrix and a wear-resistant plate, the wear-resistant layer is wrapped on the surface of the fiber matrix, the wear-resistant layer is made of polyether ether ketone or polyimide, and the bonding strength between the wear-resistant layer and the fiber matrix is ≥25 MPa.

[0013] In some embodiments, the wear-resistant layer is a polyether ether ketone plate or a polyimide plate, and the surface of the polyether ether ketone plate or the polyimide plate in contact with the fiber matrix is often treated by atmospheric pressure plasma.

[0014] In some embodiments, the atmospheric pressure plasma is atmospheric pressure plasma formed by carbon dioxide, methane or argon.

[0015] In some embodiments, the surface of the polyether ether ketone plate or the polyimide plate in contact with the fiber matrix is treated by atmospheric pressure plasma for 10-15 min under the condition of a voltage of 20-40 V.

[0016] In some embodiments, the wear-resistant layer is made of polyether ether ketone, and the resistivity thereof is ≥1×10 14 Ω·m; or the wear-resistant layer is made of polyimide, and the resistivity thereof is ≥1×10 15 Ω·m.

[0017] In some embodiments, the wear-resistant layer is a plate made of polyether ether ketone, and the resistivity thereof is 1×10 14 Ω·m-5×10 14 Ω·m (for example, 2.6×10 14 Ω·m); or the wear-resistant layer is a plate made of polyimide, and the resistivity thereof is 1×10 15 Ω·m-10×10 15 Ω·m (for example, 5.8×1015 Ω·m).

[0018] In some embodiments, the fiber matrix is prepared from fibers and resin.

[0019] In some embodiments, the fiber matrix is prepared from a method comprising the steps of,

[0020] 1) applying a release agent on the surface of the mandrel;

[0021] 2) applying the resin-impregnated fiber tows on the mandrel according to the set winding direction and the set winding thickness, the winding tension is controlled at 18% to 22% of the fiber strength, the winding direction of the fiber is measured by the angle between the fiber and the central axis of the mandrel, the fiber is first wound at an angle of 40° to 50° (for example, 45°) for n1 layers, then wound at an angle of -1° to 1° (for example, 0°) for n2 layers, and then wound at an angle of 85° to 95° (for example, 90°) for n3 layers, the ratio of n1 : n2 : n3 is 1 : 4 to 6 : 3 to 5; the fiber is wound for 4 to 6 cycles, and the total winding thickness of the fiber is 15 to 20 mm.

[0022] In some embodiments, the fiber is first wound at an angle of +45° (or -45°) for 1 layer, then wound at an angle of 0° for 5 layers, and then wound at an angle of 90° for 4 layers in step 2) above, for a total of 4 cycles, and the total winding thickness of the fiber is 15 mm.

[0023] In some embodiments, the fiber is a mixture of glass fiber and basalt fiber. In some embodiments, the fiber is a mixture of glass fiber and basalt fiber in a ratio of 2:0.5 to 1.5. In some embodiments, the fiber is a mixture of glass fiber and basalt fiber in a ratio of 2:1.

[0024] In some embodiments, the resin is an epoxy resin or a vinyl ester resin.

[0025] In some embodiments, the curing agent used for curing the resin is an aromatic amine curing agent (such as diaminodiphenyl sulfone, diaminodiphenyl methane), an acid anhydride curing agent (such as methyl nadic anhydride, methyl tetrahydrophthalic anhydride, methyl hexahydrophthalic anhydride), or a peroxide curing agent (such as isobutyl ketone peroxide, cyclohexanone peroxide, methyl ethyl ketone peroxide, benzoyl peroxide). In some embodiments, the reaction promoter used for curing the resin is cobalt naphthenate, cobalt isooctanoate, dimethyl aniline, or diethyl aniline.

[0026] In some embodiments, the resin has a bending strength of ≥ 140 MPa.

[0027] In some embodiments, the resin is in a solution state before curing, and has a viscosity of 400 to 450 CP·S.

[0028] In certain embodiments, the weight ratio of the resin to the curing agent and the accelerator is 100:20-30:0.8-1.5, for example 100:23:0.8.

[0029] In certain embodiments, the resin is a vinyl ester resin or an epoxy resin, the curing agent is isobutyryl peroxide, and the accelerator is cobalt isooctoate.

[0030] In certain embodiments, the glass fiber is an E-glass fiber.

[0031] In certain embodiments, the glass fiber has a linear density of 2400 tex-4800 tex, a single fiber diameter of 14-17 μm, an electrical resistivity of > 1 x 10 11 Ω·m, a moisture content of < 0.10%, a combustible content of < 0.5%, and an elastic modulus of > 75 GPa. In certain embodiments, the glass fiber has a linear density of 2400 tex-4800 tex, a single fiber diameter of 14-17 μm, an electrical resistivity of 1 x 10 11 Ω·m-3 x 10 11 Ω·m (e.g., 1.3 x 10 11 Ω·m, 1.5 x 10 11 Ω·m, 1.8 x 10 11 Ω·m, 2 x 10 11 Ω·m, 2.5 x 10 11 Ω·m), a moisture content of < 0.10%, a combustible content of < 0.5%, and an elastic modulus of 75 GPa-85 GPa (e.g., 78 GPa, 80 GPa).

[0032] In certain embodiments, the basalt fiber has a linear density of 2400 tex-4800 tex, a single fiber diameter of 13-16 μm, an electrical resistivity of > 1 x 10 12 Ω·m, a moisture content of < 0.10%, a combustible content of < 0.5%, and an elastic modulus of > 90 GPa. In certain embodiments, the basalt fiber has a linear density of 2400 tex-4800 tex, a single fiber diameter of 13-16 μm, an electrical resistivity of 1 x 10 12 Ω·m-5 x 10 12 Ω·m (e.g., 3.5 x 10 12 Ω·m, 3.7 x 10 12 Ω·m, 4 x 10 12 Ω·m, 4.5 x 10 12 Ω·m), a moisture content of < 0.10%, a combustible content of < 0.5%, and an elastic modulus of 90 GPa-105 GPa (e.g., 94 GPa, 98 Gpa, 102 GPa).

[0033] In certain embodiments, the bonding strength between the wear-resistant layer and the fiber substrate is ≥ 30 MPa. In certain embodiments, the bonding strength between the wear-resistant layer and the fiber substrate is 30 MPa-35 MPa. In certain embodiments, the bonding strength between the wear-resistant layer and the fiber substrate is 30 MPa-33 MPa.

[0034] In certain embodiments, the insulating arm support is prepared by a method comprising the following steps,

[0035] 1) brushing a release agent on the surface of the core mold;

[0036] 2) performing the laying of the resin-impregnated fiber tows on the core mold according to the set winding direction and laying thickness;

[0037] 3) providing a wear-resistant layer, and performing surface treatment on the wear-resistant layer using normal pressure plasma, the treatment voltage being 20-40 V, the treatment time being 10-15 min, and the wear-resistant layer being laid on the surface of the fiber substrate sample obtained in 2) within 1 min after the treatment is completed;

[0038] 4) compacting the wear-resistant layer and the fiber substrate as a whole using an outer mold, and discharging the excess resin;

[0039] 5) curing, the curing temperature being 80-140 ℃, and the curing time being 2-4 h.

[0040] The application also relates to a method for preparing the insulating arm support, comprising:

[0041] 1) brushing a release agent on the surface of the core mold;

[0042] 2) performing the laying of the resin-impregnated fiber tows on the core mold according to the set winding direction and laying thickness;

[0043] 3) providing a wear-resistant layer, and performing surface treatment on the wear-resistant layer using normal pressure plasma, the treatment voltage being 20-40 V, the treatment time being 10-15 min, and the wear-resistant layer being laid on the surface of the fiber substrate sample obtained in 2) within 1 min after the treatment is completed;

[0044] 4) compacting the wear-resistant layer and the fiber substrate as a whole using an outer mold, and discharging the excess resin;

[0045] 5) curing, the curing temperature being 80-140 ℃, and the curing time being 2-4 h.

[0046] In some embodiments, in the step 2), the fiber winding tension is controlled at 18% to 22% of the fiber strength. In some embodiments, in the step 2), the fiber winding direction is at an angle between the fiber and the center axis of the mandrel, winding n1 layers in a direction of 40° to 50° (e.g. 45°), winding n2 layers in a direction of -1° to 1° (e.g. 0°), and winding n3 layers in a direction of 85° to 95° (e.g. 90°), n1:n2:n3 being 1:4 to 6:3 to 5; and the winding is repeated for 4 to 6 cycles, and the total fiber winding thickness is 15 to 20 mm.

[0047] The application also relates to a telescopic aerial work platform, comprising the insulating boom described in any of the embodiments of the application. In some embodiments, the telescopic aerial work platform is a telescopic insulating aerial platform truck.

[0048] In the application, the "insulating boom" is a hollow boom profile made of insulating material, which can be rectangular or circular in cross section, and serves as a carrier and insulator for an aerial work platform with an insulating boom, such as an insulating aerial platform truck, to achieve safe operation on high-voltage live parts.

[0049] Beneficial technical effects of the application

[0050] The insulating boom provided by the application has high wear resistance and high insulation, and is suitable for a telescopic aerial work platform, in particular a telescopic insulating aerial platform truck, and can solve the problems of fast wear and the need for repeated repair caused by the telescopic movement of the boom, reduce external wear caused by the telescopic movement of the boom, improve the reliability of the operation of the whole machine, and reduce maintenance costs.

[0051] Compared with conventional insulating booms, the insulating boom provided by the application also has the advantage of preventing bumping and has strong environmental adaptability.

[0052] The plasma surface treatment of the application can greatly improve the bonding strength of the wear-resistant layer and the fiber matrix of the boom, tightly combine the wear-resistant layer and the fiber matrix, and ensure the wear resistance of the boom and the reliability of the telescopic operation. BRIEF DESCRIPTION OF DRAWINGS

[0053] Fig. 1 is a schematic view of the cross-sectional structure of a conventional insulating boom.

[0054] Fig. 2 is a schematic view of the cross-sectional structure of the insulating boom of an embodiment of the application.

[0055] Legend: 1, mandrel; 2, fiber matrix; 3, wear-resistant layer. DETAILED DESCRIPTION

[0056] The essential content of the present application is further illustrated below by combining the specific embodiments of the present application. It should be understood that the following embodiments are only used to illustrate the present application, but do not limit the protection scope of the present application. The specific conditions are not indicated in the following embodiments, which are carried out according to the conventional conditions or the manufacturer's recommendations. The raw materials used are conventional products that can be obtained by purchase.

[0057] Although many materials and operation methods used in the following embodiments are well known in the art, the present application still describes them as much as possible. It is clear to those skilled in the art that the materials and operation methods used in the following embodiments are well known in the art if not specifically described.

[0058] In order to improve the wear resistance and insulation of the insulating arm, the present application provides an insulating arm, a telescopic arm work vehicle, such as a telescopic aerial work platform (for example, a telescopic insulating boom truck).

[0059] The first embodiment of the present application provides an insulating arm, as shown in FIG. 2, which includes a fiber base and a wear-resistant layer wrapped on the surface of the fiber base. The wear-resistant layer includes polyether ether ketone or polyimide, and the bonding strength between the wear-resistant layer and the fiber base is ≥25 MPa.

[0060] The wear-resistant layer of the present application includes polyether ether ketone or polyimide, which is a material with high insulation and high wear resistance. Therefore, after setting the wear-resistant layer of the present application, not only the coating of the gel coat can be reduced, but also the surface wear resistance, impact resistance and anti-smashing performance of the insulating arm can be improved, the damage of the insulating arm due to collision can be reduced, and the insulating arm with excellent insulation performance can better isolate the current and reduce the risk of electric shock and burn.

[0061] The greater the thickness of the wear-resistant layer, the better the durability of the wear-resistant layer. In some embodiments, the thickness of the wear-resistant layer is 1 mm-5 mm, preferably 2 mm-4 mm. The wear resistance requirement within the normal service life of the insulating arm can be met, and the material cost and volume of the insulating arm will not be increased.

[0062] In some embodiments, the thickness of the fiber base is 15 mm-20 mm.

[0063] In some embodiments, the wear-resistant layer is a wear-resistant plate, and preferably the polyether ether ketone is from a polyether ether ketone plate and / or the polyimide is from a polyimide plate, or the polyether ether ketone is a polyether ether ketone plate and the polyimide is a polyimide plate. The plate structure is used to provide the wear-resistant layer to form a wear-resistant plate, which is beneficial to the processing of the insulating arm. Moreover, the wear-resistant layer formed by the plate has better integrity than the wear-resistant layer coated, so it is less likely to wear and tear, thereby maintaining the long-term high insulation of the insulating arm.

[0064] In some embodiments, in order to further improve the bonding strength between the plate and the fiber matrix, the surface of the plate, preferably the polyether ether ketone plate or the polyimide plate, in contact with the fiber matrix is subjected to plasma treatment, preferably atmospheric pressure plasma treatment. The hydrophilic treatment of the surface of the plate by plasma treatment enables the plate and the fiber matrix to form a better bond, and the overall firmness of the two is increased, so that the deformation amount of the insulating arm support under load is the same, thereby better maintaining the insulation.

[0065] The above-mentioned plasma treatment can be based on conventional plasma processes, such as atmospheric pressure plasma formed by carbon dioxide, methane or argon. Preferably, the surface of the polyether ether ketone plate or the polyimide plate in contact with the fiber matrix is subjected to atmospheric pressure plasma treatment for 10-15 min at a voltage of 20-40 V. This achieves sufficient bombardment and roughening of the surface of the plate, and also avoids local breakdown of the plate.

[0066] Of course, methods for improving the bonding strength between the plate and the fiber matrix are not limited to the above-mentioned plasma treatment. Acid and alkali treatment, sandblasting treatment, ion beam bombardment treatment, surface grafting modification, or the use of high-bonding adhesives or ultrasonic welding can also improve the bonding strength between the plate and the fiber matrix.

[0067] In order to further increase the tightness of the wrapping of the polyether ether ketone and the polyimide with the fiber matrix and the firmness of the combination of the two, in some embodiments, thermoplastic polyether ether ketone and thermoplastic polyimide are selected.

[0068] In some embodiments, the wear-resistant layer and the fiber matrix are bonded by a first adhesive, preferably the first adhesive comprises a resin, and further preferably the first adhesive comprises an epoxy resin or a vinyl ester resin.

[0069] In some embodiments, the fiber matrix comprises fibers and a second adhesive, and the fibers are bonded by the second adhesive, and preferably the mass content of the fibers in the fiber matrix is 70-80%.

[0070] The above-mentioned first adhesive can be an adhesive added between the fiber matrix and the wear-resistant layer during preparation, or it can come from the second adhesive used to impregnate the fibers in the fiber matrix.

[0071] The above-mentioned adhesive in the fiber matrix can be selected from conventional adhesive materials for insulating arm supports, such as a second adhesive comprising a resin, and in some embodiments the second adhesive comprises an epoxy resin or a vinyl ester resin. In some embodiments, a resin with a bending strength of 140-160 MPa is selected.

[0072] In some embodiments, the fibers include glass fibers and basalt fibers. Basalt fibers have higher rigidity than glass fibers, and thus can withstand greater pressure and torsion, improving the load-bearing capacity of the insulated boom.

[0073] In some embodiments, the glass fibers and basalt fibers are combined in a ratio to improve the rigidity of the insulated boom while making it as light and low-cost as possible. Preferably, the mass ratio of the glass fibers to the basalt fibers is 2:(5-1.5).

[0074] In some embodiments, the insulated boom extends in a first direction, and at least part of the glass fibers have an angle a with the first direction, 75°≤a≤105°, preferably 85°≤a≤95°.

[0075] In some embodiments, the insulated boom extends in a first direction, and at least part of the basalt fibers have an angle β with the first direction, -10°≤β≤10°, preferably -5°≤β≤5°. The basalt fibers can provide the insulated boom with strong rigidity, which can provide better rigid support for the load-bearing workers when the insulated boom is used in a work vehicle, improving work safety.

[0076] In some embodiments, preferably, the remaining part of the basalt fibers have an angle γ with the first direction, 40°≤γ≤50°, preferably 42°≤γ≤48°. The basalt fibers can provide the insulated boom with strong torsion resistance, which can reduce the deformation of the insulated boom caused by hanging objects, improving the work stability of the insulated boom.

[0077] It should be noted that the positive angles in the above angles represent the angles formed by counterclockwise rotation from the straight line in the first direction, and the negative angles in the above angles represent the angles formed by clockwise rotation from the straight line in the first direction.

[0078] The fibers in the fiber matrix are usually wound in multiple layers. In some embodiments, along a direction perpendicular to the first direction, the fiber matrix includes n layers of fibers, 10≤n≤50.

[0079] The glass fibers and basalt fibers cooperate with each other to provide the insulated boom with strong insulation performance and improved mechanical properties, providing rigid support and torsion resistance for the insulated boom to meet various work requirements. In some embodiments, the part of the basalt fibers having an angle β with the first direction is defined as the first part of fibers, and the part of the basalt fibers having an angle γ with the first direction is defined as the second part of fibers. Preferably, the number of layers of the second part of fibers, the number of layers of the glass fibers, and the number of layers of the first part of fibers are in a ratio of 1:(2-5):(3-10), preferably 1:(3-5):(5-10).

[0080] The glass fiber used in the present application can be selected from conventional glass fiber used for insulating boom, in some embodiments, the glass fiber meets any one or more of the following characteristics:

[0081] 1) the glass fiber is E-grade glass fiber;

[0082] 2) the linear density of the glass fiber is 1200tex-4800tex, such as 1200tex, 2400tex or 4800tex;

[0083] 3) the single fiber diameter of the glass fiber is 14μm-17μm;

[0084] 4) the resistivity of the glass fiber is ≥1×10 11 Ω·m;

[0085] 5) the elastic modulus of the glass fiber is ≥75GPa

[0086] 6) the water content of the glass fiber is ≤0.10%;

[0087] 7) the combustible content of the glass fiber is ≤0.5%.

[0088] The basalt fiber used in the present application can be selected from conventional basalt fiber, in some embodiments, the basalt fiber meets any one or more of the following characteristics:

[0089] 1) the linear density of the basalt fiber is 2400tex-4800tex;

[0090] 2) the single fiber diameter is 13μm-16μm;

[0091] 3) the resistivity is ≥1×10 12 Ω·m;

[0092] 4) the elastic modulus is ≥90GPa

[0093] 5) the water content is ≤0.10%;

[0094] 6) the combustible content is ≤0.5%.

[0095] In order to facilitate the installation of the insulating comparison, in some embodiments, the fiber substrate has a hollow cavity along the extension direction of the fiber. Such as a hollow cavity body through along the extension direction of the fiber.

[0096] In some embodiments, the above insulating boom is a telescopic insulating boom. Since the insulating boom of the present application has good insulation and wear resistance, it can be more beneficial to resist friction when applied to telescopic insulating boom.

[0097] The second embodiment of the present application provides a telescopic boom working truck, comprising a telescopic insulating boom, the telescopic insulating boom comprising the insulating boom frame provided in the first embodiment.

[0098] In some embodiments, the telescopic boom working truck is a telescopic boom aerial working truck, preferably a telescopic boom insulating aerial working truck. The telescopic boom insulating aerial working truck has high insulation, the telescopic boom has high wear resistance, the whole machine has high reliability, and the maintenance cost is low.

[0099] The third embodiment of the present application also provides a manufacturing method of any one of the insulating boom frames, the manufacturing method comprising:

[0100] preparing a fiber matrix precursor;

[0101] wrapping a wear-resistant layer on the fiber matrix precursor and performing film pressing and curing to obtain the insulating boom frame.

[0102] The wear-resistant layer is wrapped on the fiber matrix precursor and is subjected to film pressing and curing, the wear-resistant layer as a whole is bonded to the fiber matrix, the bonding strength is good, and the advantages of the wear-resistant layer can be fully played.

[0103] In some embodiments, the method for preparing the fiber matrix comprises:

[0104] applying a release agent on the surface of the mandrel;

[0105] The fiber tows impregnated with the binder precursor are laid up on the mandrel according to the set winding direction and laying thickness, the laying tension is controlled at 18%-22% of the strength of the fiber tows, and the total laying thickness of the fibers is 15mm-20mm to obtain the fiber matrix precursor.

[0106] The release agent can be referred to the conventional release agent, which will not be described herein.

[0107] In some embodiments, preferably, the winding direction of the fiber tows is measured by the included angle between the fiber tows and the central axis of the mandrel, the fiber tows comprise glass fiber tows and basalt fiber tows; preferably, the included angle between the winding direction of the glass fiber tows and the central axis of the mandrel is α, 75°≤α≤105°, preferably 85°≤α≤95°; preferably, the included angle between part of the basalt fiber tows and the central axis of the mandrel is β, -10°≤β≤10°, further preferably -5°≤β≤5°; preferably, the included angle between the remaining part of the basalt fiber tows and the central axis of the mandrel is γ, 40°≤γ≤50°, preferably 42°≤γ≤48°.

[0108] In some embodiments, preferably, each winding process comprises: first winding n1 layers in the direction of angle γ, then winding n2 layers in the direction of angle β, and then winding n3 layers in the direction of angle α, n1:n2:n3 is 1:(3-10):(2-5), preferably 1:(5-10):(3-5), and repeating the winding process for 4-6 cycles. The above-mentioned cross arrangement of the fiber layers makes the functions of each layer synergistic. Of course, the order of the above-mentioned winding process is not fixed and can be adjusted.

[0109] In some embodiments, the adhesive precursor comprises a resin, and the resin comprises an epoxy resin and / or a vinyl ester resin, preferably the bending strength of the epoxy resin or the vinyl ester resin is ≥ 140 MPa; to improve the sufficient support for the fibers.

[0110] In order to accelerate the curing of the resin, in some embodiments, preferably, the adhesive precursor further comprises a curing agent and an accelerator; preferably the curing agent is an aromatic amine curing agent (such as diaminodiphenyl sulfone, diaminodiphenyl methane), an acid anhydride curing agent (such as methyl nadic anhydride, methyl tetrahydrophthalic anhydride, methyl hexahydrophthalic anhydride) or a peroxide curing agent (such as isobutyl ketone peroxide, cyclohexanone peroxide, methyl ethyl ketone peroxide, benzoyl peroxide), and the accelerator comprises cobalt naphthenate, cobalt isooctanoate, dimethyl aniline or diethyl aniline. In some embodiments, the curing agent is isobutyl ketone peroxide, and the accelerator is cobalt isooctanoate.

[0111] In some embodiments, the weight ratio of the resin, the curing agent and the accelerator is 100:(20-30):(0.8-1.5).

[0112] In some embodiments, the process of wrapping the wear-resistant layer on the fiber matrix precursor and performing film pressing and curing comprises:

[0113] The wear-resistant plate is wrapped on the surface of the fiber matrix precursor and is compacted to obtain a compacted member;

[0114] The compacted member is cured, and the curing temperature is preferably 80-140°C, and the curing time is preferably 2-4h.

[0115] The wear-resistant plate is wrapped on the fiber matrix precursor by using the flexibility of the wear-resistant plate, and then is compacted and cured, and the resin in the fiber matrix precursor is extruded to bond the wear-resistant plate and the fiber matrix. The above-mentioned wear-resistant plate can be in the form of one or more pieces wrapped on the fiber matrix precursor, and whether it is one piece or multiple pieces, it has the advantages of better integrity and better impact resistance than the coating method.

[0116] Moreover, the wear-resistant material coated on the wear-resistant layer needs curing operation, time and process, especially when the curing conditions of the resin in the fiber substrate are different from the curing conditions of the wear-resistant material (such as polyether ether ketone or polyimide), which makes the process operation more complicated. The above-mentioned wear-resistant plate can overcome the above-mentioned problems.

[0117] In some embodiments, the wear-resistant plate is a wear-resistant plate whose surface is treated by atmospheric pressure plasma, the treatment voltage is 20-40 V, the treatment time is 10-15 min, and the wear-resistant plate is laid on the surface of the fiber substrate precursor within 1 min after the treatment is completed. The surface roughness of the wear-resistant plate is improved, and the bonding strength with the fiber substrate is increased.

[0118] The plasma generator used in the embodiments of the present application is a low-temperature plasma generator, which is purchased from Nanjing Sumen Electronics Co., Ltd. and is CTP-2000K.

[0119] As shown in FIG. 2, an insulating arm of a telescopic boom aerial working truck (for example, a telescopic boom insulating aerial truck) according to some embodiments of the present application is composed of a hollow fiber substrate 2 and a wear-resistant plate 3, the wear-resistant layer is wrapped on the surface of the fiber substrate, the wear-resistant layer is made of polyether ether ketone or polyimide, and the bonding strength between the wear-resistant layer and the fiber substrate is ≥25 MPa.

[0120] In some embodiments, the wear-resistant layer 3 can be a polyether ether ketone plate or a polyimide plate, and the surface of the polyether ether ketone plate or the polyimide plate in contact with the fiber substrate 2 is treated by atmospheric pressure plasma. The plasma surface treatment can greatly improve the bonding strength between the wear-resistant layer 3 and the fiber substrate 2, and ensure the wear-resistant performance and telescopic operation reliability of the arm.

[0121] In some embodiments, the atmospheric pressure plasma is atmospheric pressure plasma formed by carbon dioxide, methane or argon.

[0122] In some embodiments, the surface of the polyether ether ketone plate or the polyimide plate in contact with the fiber substrate is treated by atmospheric pressure plasma under the condition of a voltage of 20-40 V for 10-15 min.

[0123] In some embodiments, the wear-resistant layer is made of polyether ether ketone, and the resistivity thereof is ≥1×10 14 Ω·m; or the wear-resistant layer is made of polyimide, and the resistivity thereof is ≥1×10 15 Ω·m.

[0124] In some embodiments, the wear-resistant layer 3 is a plate made of polyether ether ketone, and the resistivity thereof is 1×10 14 Ω·m-5×10 14Ω·m (e.g. 2.6 x 10 14 Ω·m) or the wear-resistant layer 3 is a polyimide plate with a resistivity of 1 x 10 15 Ω·m ~ 10 x 10 15 Ω·m (e.g. 5.8 x 10 15 Ω·m).

[0125] In some embodiments, the fiber matrix 2 is prepared from fibers and resin.

[0126] In some embodiments, the fiber matrix 2 is prepared from a method comprising the following steps,

[0127] 1) brushing a release agent on the surface of the mandrel 1;

[0128] 2) laying the resin-impregnated fiber tows on the mandrel according to the set winding direction and laying thickness, the laying tension being controlled at 18% ~ 22% of the fiber strength, the winding direction of the fiber being at an angle of 40° ~ 50° (e.g. 45°) first, n1 layers, then at an angle of -1° ~ 1° (e.g. 0°) for n2 layers, and then at an angle of 85° ~ 95° (e.g. 90°) for n3 layers, n1 : n2 : n3 being 1 : 4 ~ 6 : 3 ~ 5; such winding is repeated for 4 ~ 6 cycles, and the total laying thickness of the fiber is 15 ~ 20 mm.

[0129] In some embodiments, the fiber in step 2) above is first wound at an angle of +45° (or -45°) for 1 layer, then at an angle of 0° for 5 layers, and then at an angle of 90° for 4 layers, for a total of 4 cycles, and the total laying thickness of the fiber is 15 mm.

[0130] In some embodiments, the fiber is a mixture of glass fiber and basalt fiber. The addition of basalt fiber can improve the strength and insulation of the fiber matrix 2. In some embodiments, the fiber is a mixture of glass fiber and basalt fiber in a ratio of 2:0.5 ~ 1.5. In some embodiments, the fiber is a mixture of glass fiber and basalt fiber in a ratio of 2:1.

[0131] In some embodiments, the resin is epoxy resin or vinyl ester resin.

[0132] In certain embodiments, the curing agent used for curing the resin is an aromatic amine curing agent (such as diaminodiphenyl sulfone, diaminodiphenyl methane), an acid anhydride curing agent (such as methyl nadic anhydride, methyltetrahydrophthalic anhydride, methylhexahydrophthalic anhydride), or a peroxide curing agent (such as isobutyl ketone peroxide, cyclohexanone peroxide, methyl ethyl ketone peroxide, benzoyl peroxide). In certain embodiments, the reaction promoter used for curing the resin is cobalt naphthenate, cobalt isooctoate, dimethyl aniline, or diethyl aniline.

[0133] In certain embodiments, the resin has a flexural strength of ≥ 140 MPa.

[0134] In certain embodiments, the resin is in solution form before curing, and has a viscosity of 400-450 CP-S.

[0135] In certain embodiments, the weight ratio of the resin to the curing agent and the promoter is 100:20-30:0.8-1.5, such as 100:23:0.8.

[0136] In certain embodiments, the resin is a vinyl ester resin or an epoxy resin, the curing agent is isobutyl ketone peroxide, and the promoter is cobalt isooctoate.

[0137] In certain embodiments, the glass fiber is an E-glass fiber.

[0138] In certain embodiments, the glass fiber has a linear density of 2400 tex-4800 tex, a single fiber diameter of 14-17 μm, an electrical resistivity of ≥ 1 x 10 11 Ω-m, a moisture content of ≤ 0.10%, a combustible content of ≤ 0.5%, and an elastic modulus of ≥ 75 GPa. In certain embodiments, the glass fiber has a linear density of 2400 tex-4800 tex, a single fiber diameter of 14-17 μm, an electrical resistivity of 1 x 10 11 Ω-m-3 x 10 11 Ω-m (such as 1.3 x 10 11 Ω-m, 1.5 x 10 11 Ω-m, 1.8 x 10 11 Ω-m, 2 x 10 11 Ω-m, 2.5 x 10 11 Ω-m), a moisture content of ≤ 0.10%, a combustible content of ≤ 0.5%, and an elastic modulus of 75 GPa-85 GPa (such as 78 GPa, 80 GPa).

[0139] In certain embodiments, the basalt fiber has a linear density of 2400 tex-4800 tex, a single fiber diameter of 13-16 μm, an electrical resistivity of ≥ 1 x 10 12Ω·m, water content ≤ 0.10%, combustible content ≤ 0.5%, and elastic modulus ≥ 90 GPa. In certain embodiments, the basalt fiber has a linear density of 2400 tex to 4800 tex, a single fiber diameter of 13 to 16 μm, and an electrical resistivity of 1 x 10 12 Ω·m to 5 x 10 12 Ω·m (e.g., 3.5 x 10 12 Ω·m, 3.7 x 10 12 Ω·m, 4 x 10 12 Ω·m, 4.5 x 10 12 Ω·m), a water content of ≤ 0.10%, a combustible content of ≤ 0.5%, and an elastic modulus of 90 GPa to 105 GPa (e.g., 94 GPa, 98 GPa, 102 GPa).

[0140] In certain embodiments, the bonding strength between the wear-resistant layer 3 and the fiber matrix 2 is ≥ 30 MPa. In certain embodiments, the bonding strength between the wear-resistant layer 3 and the fiber matrix 2 is 30 MPa to 35 MPa. In certain embodiments, the bonding strength between the wear-resistant layer 3 and the fiber matrix 2 is 30 MPa to 33 MPa.

[0141] In certain embodiments, the insulating arm support is prepared by a method comprising the steps of,

[0142] 1) brushing a release agent on the surface of the mandrel 1;

[0143] 2) performing a laying operation on the mandrel 1 according to a set winding direction and laying thickness using the resin-impregnated fiber tows;

[0144] 3) providing a wear-resistant layer 3, and performing a surface treatment on the wear-resistant layer 3 using atmospheric pressure plasma, a treatment voltage of 20 to 40 V, and a treatment time of 10 to 15 min, and within 1 min after the treatment, laying the wear-resistant layer 3 on the surface of the fiber matrix 2 sample obtained in 2);

[0145] 4) compacting the wear-resistant layer 3 and the fiber matrix 2 as a whole using an outer mold, and discharging excess resin;

[0146] 5) curing, a curing temperature of 80 to 140 °C, and a curing time of 2 to 4 h.

[0147] The present application also relates to a method for preparing the insulating arm support, comprising:

[0148] 1) brushing a release agent on the surface of the mandrel 1;

[0149] 2) performing a laying operation on the mandrel 1 according to a set winding direction and laying thickness using the resin-impregnated fiber tows;

[0150] 3) providing wear-resistant layer 3 and using atmospheric pressure plasma to surface treat wear-resistant layer 3, treatment voltage is 20-40V, treatment time is 10-15min, within 1min after treatment, wear-resistant layer 3 is laid on the surface of fiber substrate 2 sample obtained in 2);

[0151] 4) using an outer mold to compact wear-resistant layer 3 and fiber substrate 2 as a whole, and discharging excess resin;

[0152] 5) curing, curing temperature is 80-140℃, curing time is 2-4h.

[0153] In some embodiments, in the above step 2), the fiber laying tension is controlled at 18%-22% of the fiber strength. In some embodiments, in the above step 2), the winding direction of the fiber is at an angle between the fiber and the central axis of the core mold, first winding n1 layers in the direction of 40°-50° (for example, 45°), then winding n2 layers in the direction of -1°-1° (for example, 0°), and then winding n3 layers in the direction of 85°-95° (for example, 90°), n1:n2:n3 is 1:4-6:3-5; 4-6 cycles are wound in this way, and the total fiber laying thickness is 15-20mm.

[0154] The application also relates to a telescopic aerial work platform, comprising the insulating boom described in any of the embodiments of the application. In some embodiments, the telescopic aerial work platform is a telescopic insulating aerial boom truck. The telescopic aerial work platform, in particular the telescopic insulating aerial boom truck, has high insulation, wear resistance on the outside of the telescopic arm, high reliability in operation of the whole machine, and low maintenance cost.

[0155] Example 1

[0156] 1. Preparation of raw materials

[0157] The reinforcing fiber is made of glass fiber and basalt fiber in a ratio of 2:1, the glass fiber is E-grade glass fiber with linear density of 2400tex, single fiber diameter of 17μm, resistivity of 1.8×10 11 Ω·m, water content of 0.10%, combustible content of 0.5%, and elastic modulus of 78GPa (purchased from Taian Jufu New Material Co., Ltd., Taishan Glass Fiber TCR910-2400-17); the basalt fiber has linear density of 2400tex, single fiber diameter of 16μm, resistivity of 3.5×10 12 Ω·m, water content of 0.10%, combustible content of 0.5%, and elastic modulus of 98Gpa (purchased from Guizhou Shixin Basalt Technology Co., Ltd., No-twist Roving 2400tex).

[0158] The resin is epoxy resin with the brand of Shangwei 2513-A / 2513-BL, the weight ratio of AB materials is 100 / 20.

[0159] The wear-resistant layer is a plate of polyether ether ketone material (purchased from Changzhou Junhua Special Engineering Plastics Co., Ltd., PEEK-450G), with a resistivity of 2.6 x 10 14 Ω·m, composed of four plates with sizes of 5000 mm x 300 mm x 2 mm, 5000 mm x 300 mm x 2 mm, 5000 mm x 204 mm x 2 mm, and 5000 mm x 204 mm x 2 mm, respectively, and the joints of the four plates are chamfered.

[0160] 2. Preparation of the insulated boom

[0161] 1) Install the metal core mold on the laying and winding integrated machine, and uniformly brush the release agent on the surface;

[0162] 2) Mix the AB materials of epoxy resin in the specified proportion through the automatic glue mixing machine and inject them into the glue tank for standby, which is used for impregnating the fiber tows;

[0163] 3) Use the laying and winding integrated machine to lay and wind the impregnated fiber tows on the metal core mold according to the set winding direction and laying thickness, with the laying tension controlled at 18% of the fiber strength. The winding direction of the fiber is measured by the included angle between the fiber and the center axis of the core mold. First, lay and wind the basalt fiber at +45° (or -45°) for 1 layer, then lay and wind the basalt fiber at 0° for 5 layers, and then lay and wind the glass fiber at 90° for 4 layers. A total of 4 cycles are performed, and the total laying thickness is 15 mm;

[0164] 4) Lay the pre-prepared wear-resistant plate on the surface of the fiber matrix sample obtained in step 3), wherein the plate of polyether ether ketone material is subjected to surface treatment using normal pressure methane plasma, with a treatment voltage of 40 V and a treatment time of 10 min, to obtain the pre-prepared wear-resistant plate. The wear-resistant plate is laid within 1 min after the treatment is completed;

[0165] 5) Use the outer mold to compact and lock the wear-resistant plate and the fiber matrix sample obtained in step 3) as a whole, and discharge the excess resin;

[0166] 6) Move the boom sample obtained in step 5 as a whole into the oven for curing, with a curing temperature of 100°C and a curing time of 2h.

[0167] Example 2

[0168] 1. Preparation of raw materials

[0169] The reinforcing fiber is a mixture of glass fiber and basalt fiber in a ratio of 2:1, the glass fiber is E-grade glass fiber with a linear density of 2400 tex and a single fiber diameter of 14 μm, and the resistivity is 1.5 x 10 11Ω·m, moisture content of 0.10%, combustible content of 0.5%, and elastic modulus of 80 GPa (purchased from Tai'an Jufu New Material Co., Ltd., Taishan EDR240); basalt fiber line density of 4800 tex, single fiber diameter of 14 μm, and resistivity of 3.5 x 10 12 Ω·m, moisture content of 0.10%, combustible content of 0.5%, and elastic modulus of 94 GPa (purchased from Guizhou Shixin Basalt Technology Co., Ltd., no-twist roving 4800 tex).

[0170] The resin is vinyl resin, the brand is Lieliangsi 430, the curing agent is isobutyl ketone peroxide, and the accelerator is cobalt isooctoate, and the weight ratio of resin: curing agent: accelerator is 100:23:0.8.

[0171] The wear-resistant layer is a plate made of polyimide material (purchased from Changzhou Junhua Special Engineering Plastic Products Co., Ltd., polyimide M1), and the resistivity is 5.8 x 10 15 Ω·m, and is composed of four plates with sizes of 5000 mm x 300 mm x 2 mm, 5000 mm x 300 mm x 2 mm, 5000 mm x 204 mm x 2 mm, and 5000 mm x 204 mm x 2 mm, respectively, and the joints of the four plates are chamfered.

[0172] 2. Preparation of the insulated arm support

[0173] 1) Install the metal core mold on the laying and winding integrated machine, and uniformly brush the release agent on the surface;

[0174] 2) Mix and inject the raw materials such as resin, curing agent, and accelerator into the glue tank according to the specified ratio through the automatic glue mixing machine for standby, which is used for impregnating the fiber tows;

[0175] 3) Use the laying and winding integrated machine to lay and wind the resin-impregnated fiber tows on the metal core mold according to the set winding direction and laying thickness, and control the laying tension at 20% of the fiber strength. The winding direction of the fiber is measured by the included angle between the fiber and the center axis of the core mold. First, lay and wind the basalt fiber at +45° (or -45°) for 1 layer, then lay and wind the basalt fiber at 0° for 5 layers, and then lay and wind the glass fiber at 90° for 4 layers. A total of 4 cycles are performed, and the total laying thickness is 15 mm;

[0176] 4) Lay the pre-prepared wear-resistant plate on the surface of the fiber matrix sample obtained in step 3), wherein the plate made of polyimide material is subjected to surface treatment using normal pressure carbon dioxide plasma, the treatment voltage is 20 V, and the treatment time is 15 min, to obtain the pre-prepared wear-resistant plate. The wear-resistant plate is laid within 1 min after the treatment is completed;

[0177] 5) Using the outer mold to compact and lock the wear plate and the fiber matrix sample obtained in step 3) as a whole, and discharge the excess resin;

[0178] 6) Move the arm support sample obtained in step 5) as a whole into the oven for curing, the curing temperature is 110°C, and the curing time is 2.5h.

[0179] Example 3

[0180] 1. Preparation of raw materials

[0181] The reinforcing fibers are selected from glass fibers and basalt fibers in a ratio of 2:1, the glass fibers are selected from E-grade glass fibers, the linear density is 2400tex, the single fiber diameter is 15μm, the resistivity is 1.3×10 11 Ω·m, the moisture content is 0.10%, the combustible content is 0.5%, and the elastic modulus is 80GPa (purchased from Chongqing International Composite Material Co., Ltd., 2400tex); the basalt fiber linear density is 2400tex, the single fiber diameter is 16μm, the resistivity is 3.7×10 12 Ω·m, the moisture content is 0.10%, the combustible content is 0.5%, and the elastic modulus is 102GPa (purchased from Guizhou Shixin Basalt Technology Co., Ltd., untwisted roving 2400tex).

[0182] The resin is epoxy resin, the grade is Shangwei 2513-A / 2513-BL, and the weight ratio of AB material is 100 / 27.

[0183] The wear-resistant layer is a plate made of polyether ether ketone material (purchased from Changzhou Junhua Special Engineering Plastic Products Co., Ltd., PEEK-450G), the resistivity is 2.6×10 14 Ω·m, which is composed of four plates with sizes of 5000mm×300mm×2mm, 5000mm×300mm×2mm, 5000mm×204mm×2mm and 5000mm×204mm×2mm, respectively, and the joint of the four plates is chamfered.

[0184] 2. Preparation of insulated arm support

[0185] 1) Install the metal core mold on the laying and winding integrated machine, and uniformly brush the release agent on the surface;

[0186] 2) Mix and inject the AB material of epoxy resin into the glue tank through the automatic glue mixer according to the specified proportion for use in impregnating the fiber tows;

[0187] 3) using the laying and winding integrated machine to lay and wind the resin-impregnated fiber tows on the metal core mold according to the set winding direction and laying thickness, the laying tension is controlled at 22% of the fiber strength, the winding direction of the fiber is calculated by the included angle between the fiber and the central axis of the core mold, basalt fibers are first wound at +45° (or -45°) for 1 layer, then basalt fibers are wound at 0° for 5 layers, and then glass fibers are wound at 90° for 4 layers, a total of 4 cycles, and the total laying thickness is 15 mm;

[0188] 4) the prepared wear-resistant plate is attached to the surface of the fiber substrate sample obtained in step 3), wherein the plate material of polyether ether ketone is subjected to surface treatment using normal pressure methane plasma, the treatment voltage is 30 V, and the treatment time is 12 min, to obtain the prepared wear-resistant plate, and the wear-resistant plate is attached within 1 min after the treatment is completed;

[0189] 5) using an outer mold, the wear-resistant plate and the fiber substrate sample obtained in step 3) are compacted and locked as a whole, and the excess resin is discharged;

[0190] 6) the arm support sample obtained in step 5) is moved into an oven as a whole for curing, the curing temperature is 115°C, and the curing time is 3 h.

[0191] Example 4

[0192] On the basis of example 1, the process of step 3) is changed as follows:

[0193] using the laying and winding integrated machine to lay and wind the resin-impregnated fiber tows on the metal core mold according to the set winding direction and laying thickness, the laying tension is controlled at 22% of the fiber strength, the winding direction of the fiber is calculated by the included angle between the fiber and the central axis of the core mold, basalt fibers are first wound at +45° (or -45°) for 1 layer, then basalt fibers are wound at 0° for 5 layers, and then glass fibers are wound at 90° for 4 layers, a total of 4 cycles, and the total laying thickness is 15 mm.

[0194] The rest is the same as example 1.

[0195] Example 5

[0196] On the basis of example 1, the process of step 3) is changed as follows:

[0197] using the laying and winding integrated machine to lay and wind the resin-impregnated fiber tows on the metal core mold according to the set winding direction and laying thickness, the laying tension is controlled at 22% of the fiber strength, the winding direction of the fiber is calculated by the included angle between the fiber and the central axis of the core mold, basalt fibers are first wound at +45° (or -45°) for 1 layer, then basalt fibers are wound at 0° for 5 layers, and then glass fibers are wound at 90° for 4 layers, a total of 4 cycles, and the total laying thickness is 15 mm.

[0198] Example 6

[0199] The difference between the embodiment 1 is that the plate of polyether ether ketone material is not treated by normal pressure methane plasma, but the surface of the plate of polyether ether ketone material and the fiber matrix is treated by 98% concentrated sulfuric acid, and the rest is the same as the embodiment 1.

[0200] Comparative example 1

[0201] The insulating arm support of the comparative example 1 is compared with the embodiment 1, and the difference is only that the polyether ether ketone wear-resistant plate is not used, but the polyester resin (purchased from Changzhou Diyou New Material Co., Ltd., the main components include polyester, styrene and color powder) is sprayed on the surface of the fiber matrix to form a resin coating, and the other processes are consistent.

[0202] Comparative example 2

[0203] The insulating arm support of the comparative example 2 is compared with the embodiment 1, and the difference is only that the polyether ether ketone wear-resistant plate is not treated by normal pressure methane plasma surface treatment, and the other processes are consistent.

[0204] Performance test

[0205] The insulating arm supports prepared in the embodiment 1-6 and the comparative examples 1-2 are subjected to installation verification and insulation performance test, and the results are shown in Table 1.

[0206] Table 1 Performance comparison of the arm supports prepared in the embodiments and the comparative examples

[0207] The above installation verification is to load the insulating arm support on the Xugong machinery GKJH21GZL0 type aerial work vehicle to verify the operation.

[0208] The test results show that, compared with the comparative example 1, the insulating arm support prepared in the embodiment has the advantages of good wear resistance, excellent insulation performance, etc., can reduce the external wear of the telescopic arm support, improve the reliability of the whole machine operation, and reduce the maintenance cost; compared with the comparative example 2, the application of normal pressure plasma to the surface treatment of the wear-resistant layer or the use of concentrated sulfuric acid for the surface treatment of the wear-resistant layer can greatly improve the bonding strength of the wear-resistant layer and the fiber layer matrix, and ensure the wear resistance of the arm support and the reliability of the whole machine operation.

[0209] The above preferred embodiments should not be regarded as a limitation of the present application, and the protection scope of the present application should be defined by the scope defined in the claims. For ordinary skilled persons in the technical field, several improvements can be made without departing from the spirit and scope of the present application, and these improvements should also be regarded as the protection scope of the present application.

Claims

1. An insulating arm support, comprising a fiber matrix and a wear-resistant layer, wherein the wear-resistant layer is wrapped around the surface of the fiber matrix, the wear-resistant layer comprises polyetheretherketone or polyimide, and the bonding strength between the wear-resistant layer and the fiber matrix is ​​≥25MPa.

2. The insulating arm support according to claim 1, wherein: The thickness of the wear-resistant layer is 1 mm to 5 mm and / or the thickness of the fiber matrix is ​​15 mm to 20 mm.

3. The insulating arm support according to any one of claims 1 or 2, wherein: The wear-resistant layer is a wear-resistant plate, and preferably the polyetheretherketone comes from a polyetheretherketone sheet and / or the polyimide comes from a polyimide sheet. Preferably, the surface of the polyetheretherketone sheet or the polyimide sheet in contact with the fiber matrix has been plasma treated, preferably treated with normal pressure plasma.

4. The insulating arm support according to claim 3, wherein: The atmospheric pressure plasma is atmospheric pressure plasma formed by carbon dioxide, methane or argon.

5. The insulating arm support according to claim 3 or 4, wherein: The surface of the polyetheretherketone sheet or polyimide sheet that contacts the fiber matrix is ​​treated with normal pressure plasma at a voltage of 20V-40V for 10min-15min.

6. The insulating arm support according to any one of claims 1 to 5, wherein: The wear-resistant layer and the fiber matrix are bonded together by a first adhesive. Preferably, the first adhesive comprises a resin, and more preferably, the first adhesive comprises an epoxy resin or a vinyl ester resin.

7. The insulating arm support according to any one of claims 1 to 6, wherein: The fiber matrix comprises fibers and a second binder, the fibers are bonded by the second binder, and preferably the second binder comprises epoxy resin or vinyl ester resin; preferably, the mass content of the fibers in the fiber matrix is ​​70%-80%.

8. The insulating arm support according to claim 7, wherein: The fibers include glass fibers and basalt fibers, and preferably the mass ratio of the glass fibers to the basalt fibers is 2:(5-1.5).

9. The insulating arm support according to claim 7 or 8, wherein: The insulating arm extends along a first direction, and at least a portion of the glass fibers have an angle α with the first direction, 75°≤α≤105°, preferably 85°≤α≤95°.

10. The insulating arm support according to any one of claims 7 to 9, wherein: The insulating arm extends along a first direction, and at least part of the basalt fibers form an angle β with the first direction, wherein -10°≤β≤10°, preferably -5°≤β≤5°; Preferably, the remaining portion of the basalt fibers has an angle γ with the first direction, which is 40°≤γ≤50°, and preferably satisfies 42°≤γ≤48°.

11. The insulating arm support according to claim 10, wherein: Along a direction perpendicular to the first direction, the fiber matrix includes n layers of fibers, 10≤n≤50; The portion of basalt fibers having an angle β with the first direction is defined as a first portion of fibers, and the portion of basalt fibers having an angle γ with the first direction is defined as a second portion of fibers. Preferably, the ratio of the number of layers of the second portion of fibers, the number of layers of the glass fibers, and the number of layers of the first portion of fibers is 1:(2-5):(3-10), preferably 1:(3-5):(5-10).

12. The insulating arm support according to any one of claims 8 to 11, wherein: The glass fiber meets any one or more of the following characteristics: 1) The glass fiber is E-grade glass fiber; 2) The linear density of the glass fiber is 1200tex-4800tex; 3) The single fiber diameter of the glass fiber is 14 μm-17 μm; 4) The resistivity of the glass fiber is ≥1×10 11 Ω·m; 5) The elastic modulus of the glass fiber is ≥75 GPa; 6) The moisture content of the glass fiber is ≤0.10%; 7) The combustible content of the glass fiber is ≤0.5%.

13. The insulating arm support according to any one of claims 8 to 12, wherein: The basalt fiber meets any one or more of the following characteristics: 1) Basalt fiber linear density 2400tex-4800tex; 2) Single fiber diameter 13μm-16μm; 3) Resistivity ≥ 1×10 12 Ω·m; 4) Elastic modulus ≥ 90 GPa; 5) Moisture content ≤ 0.10%; 6) Combustible content ≤ 0.5%.

14. The insulating arm support according to any one of claims 1 to 13, wherein: The fiber matrix has a hollow cavity along the extending direction of the fiber.

15. The insulating arm support according to any one of claims 1 to 14, wherein: The insulating arm is a telescopic insulating arm.

16. A telescopic boom work vehicle, comprising a telescopic insulating arm, wherein: The telescopic insulating arm comprises the insulating arm stand according to any one of claims 1 to 15.

17. The telescopic boom work vehicle according to claim 16, wherein: The telescopic boom work vehicle is a telescopic boom aerial work vehicle, preferably a telescopic boom insulated bucket arm vehicle.

18. A method for manufacturing the insulating arm support according to any one of claims 1 to 17, wherein: The manufacturing method comprises: preparing a fiber matrix precursor; The fiber matrix precursor is wrapped with a wear-resistant layer and subjected to film pressing and curing to obtain an insulating arm support.

19. The manufacturing method according to claim 18, wherein: The method for preparing a fiber matrix precursor comprises: Apply release agent on the surface of the core mold; The fiber bundle impregnated with the binder precursor is laid on the core mold according to the set winding direction and laying thickness. The laying tension is controlled at 18%-22% of the strength of the fiber bundle, and the total fiber laying thickness is 15mm-20mm to obtain a fiber matrix precursor. Preferably, the winding direction of the fiber bundle is measured by the angle between the fiber bundle and the central axis of the core mold, and the fiber bundle includes a glass fiber bundle and a basalt fiber bundle; Preferably, the angle α between the winding direction of the glass fiber bundle and the central axis of the core mold is 75°≤α≤105°, preferably 85°≤α≤95°; Preferably, the angle between some of the basalt fiber bundles and the central axis of the core mold is β, -10°≤β≤10°, more preferably -5°≤β≤5°; Preferably, the angle γ between the remaining portion of the basalt fiber and the central axis of the core mold is 40°≤γ≤50°, preferably 42°≤γ≤48°; Preferably, each winding process includes: first winding n1 layers in the γ angle direction, then winding n2 layers in the β angle direction, and then winding n3 layers in the α angle direction, n1:n2:n3 is 1:(3-10):(2-5), preferably 1:(5-10):(3-5), and repeating the winding 4-6 cycles.

20. The manufacturing method according to claim 19, wherein: The binder precursor comprises a resin, wherein the resin comprises an epoxy resin and / or a vinyl ester resin, and preferably the flexural strength of the epoxy resin or the vinyl ester resin is ≥140 MPa; Preferably, the binder precursor further comprises a curing agent and an accelerator; preferably, the curing agent is an aromatic amine curing agent, an acid anhydride curing agent or a peroxide curing agent, and the accelerator comprises cobalt naphthenate, cobalt isooctanoate, dimethylaniline or diethylaniline; The weight ratio of the resin, the curing agent and the accelerator is 100:(20-30):(0.8-1.5).

21. The manufacturing method according to any one of claims 18 to 20, wherein: The process of wrapping the wear-resistant layer on the fiber matrix precursor and performing film pressing and curing includes: wrapping a wear-resistant plate on the surface of a fiber matrix precursor and compacting the surface to obtain a compacted part; The compacted part is cured, preferably at a curing temperature of 80° C. to 140° C., and preferably for a curing time of 2 h to 4 h.

22. The manufacturing method according to claim 21, wherein: The wear-resistant plate is a wear-resistant plate whose surface is treated with normal pressure plasma, the treatment voltage is 20-40V, the treatment time is 10-15 minutes, and the wear-resistant plate is laid on the surface of the fiber matrix precursor within 1 minute after the treatment.

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