Insulating arm support and preparation method thereof

Abstract

The invention relates to an insulating arm support for a telescopic arm type overhead working truck, a preparation method of the insulating arm support and the telescopic arm type overhead working truck comprising the insulating arm support.

Description

[0001] Cross-reference

[0002] This application is based on a Chinese application with the application number 202411833470.6 and the filing date of December 12, 2024, and claims its priority. The disclosure of this Chinese application is hereby incorporated herein by reference in its entirety. Technical Field

[0003] This application belongs to the field of construction machinery, specifically an insulating boom and its preparation method, and also relates to a telescopic boom type aerial work platform including the insulating boom. Background Art

[0004] Insulating boom trucks were initially introduced into the power industry as special vehicles for live working at intermediate potential in occasions with convenient transportation and complex wiring. With the development of the power industry and continuous technological progress, insulating boom trucks have undergone multiple technological breakthroughs and product upgrades. In terms of working height, it has developed from the initial few meters and more than ten meters to the current 25 meters or even higher, which poses higher technical requirements for the performance of the insulating section of the vehicle's main boom. Currently, the last section of the main boom of telescopic insulating boom trucks is the insulating section, with a length ranging from 1 to 6 meters. Since this section is connected to the insulating boom, it not only needs to have excellent insulation performance and anti-bending performance, but also needs to meet the high anti-wear performance required for telescopic operation.

[0005] As Figure 1 shown, most of the current insulating booms on the market are composed of glass fiber as the reinforcing phase and resin as the continuous phase, and are composite-cured through the wet winding process. Due to the limitation of the wet winding process, the angle between the fiber arrangement direction and the mold central axis is usually more than 5°, and the characteristics of high strength and high modulus in the fiber axial direction cannot be fully utilized. In terms of insulation, the outer surface is usually sprayed with gel coat. Although it can achieve a certain weather resistance effect, its wear resistance is poor, it is easily worn during the telescopic process of the boom, and at the same time, the insulation performance is reduced, and regular repairs are required. Summary of the Invention

[0006] The purpose of this application is to improve the wear resistance and insulation of the insulating boom. Therefore, an insulating boom and a telescopic boom type work vehicle are provided. For example, an insulating boom for a telescopic boom type aerial work platform (such as a telescopic insulating boom truck) is provided. This insulating boom has good wear resistance and insulation, and can solve problems such as the external wear resistance and insufficient insulation performance of telescopic insulating booms.

[0007] The first aspect of this application provides an insulating boom, including a fiber matrix and a wear-resistant layer. The wear-resistant layer wraps the surface of the fiber matrix. The wear-resistant layer includes polyether ether ketone or polyimide, and the bonding strength between the wear-resistant layer and the fiber matrix is ≥25 MPa.

[0008] 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 can the coating of gel coat be reduced, but also the wear resistance, impact resistance and anti-smashing performance of the surface of the insulating boom can be improved, the bump damage of the insulating boom can be reduced, and at the same time, the insulating boom has excellent insulating performance, can better isolate current, and reduce the risks of electric leakage and burns.

[0009] The present application also provides a manufacturing method of the insulating boom according to the first aspect, wherein the manufacturing method includes:

[0010] Preparing a fiber matrix precursor;

[0011] Wrapping a wear-resistant layer on the fiber matrix precursor and performing film pressing and curing to obtain an insulating boom.

[0012] The present application relates to an insulating boom for a telescopic boom type aerial work vehicle (such as a telescopic boom type insulating bucket boom 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 treated by atmospheric pressure plasma.

[0014] In some embodiments, the atmospheric pressure plasma is an 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 its resistivity ≥ 1×10 14 Ω·m; or the wear-resistant layer is made of polyimide, and its resistivity ≥ 1×10 15 Ω·m.

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

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

[0019] In certain embodiments, the fiber matrix is prepared by a method comprising the following steps

[0020] 1) Brush a release agent on the surface of the core mold;

[0021] 2) Wind the fiber tow impregnated with resin on the core mold according to the set winding direction and winding thickness, and control the winding tension at 18% - 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 core mold. First, wind n1 layers in the direction of 40° - 50° (such as 45°), then wind n2 layers in the direction of -1° - 1° (such as 0°), and then wind n3 layers in the direction of 85° - 95° (such as 90°), where n1:n2:n3 is 1:4 - 6:3 - 5; wind in this way for 4 - 6 cycles, and the total winding thickness of the fiber is 15 - 20 mm.

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

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

[0024] In certain embodiments, the resin is epoxy resin or vinyl ester resin.

[0025] 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 methyl ethyl ketone peroxide, cyclohexanone peroxide, methyl ethyl ketone peroxide, benzoyl peroxide). In certain embodiments, the reaction accelerator used for curing the resin is cobalt naphthenate, cobalt isooctoate, dimethylaniline or diethylaniline.

[0026] In certain embodiments, the flexural strength of the resin ≥ 140 MPa.

[0027] In certain embodiments, the resin is in a solution state before curing, and its viscosity is 400 - 450 CP·S.

[0028] In some embodiments, the weight ratio of the resin, curing agent and accelerator is 100:20 to 30:0.8 to 1.5, such as 100:23:0.8.

[0029] In some embodiments, the resin is a vinyl ester resin or an epoxy resin, the curing agent is methyl ethyl ketone peroxide, and the accelerator is cobalt octoate.

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

[0031] In some embodiments, the linear density of the glass fiber is 2400 tex to 4800 tex, the single fiber diameter is 14 to 17 μm, the resistivity is ≥ 1 × 10 11 Ω·m, the moisture content is ≤ 0.10%, the combustible content is ≤ 0.5%, and the elastic modulus is ≥ 75 GPa. In some embodiments, the linear density of the glass fiber is 2400 tex to 4800 tex, the single fiber diameter is 14 to 17 μm, and the resistivity is 1 × 10 11 Ω·m to 3 × 10 11 Ω·m (such as 1.3 × 10 11 Ω·m, 1.5 × 10 11 Ω·m, 1.8 × 10 11 Ω·m, 2 × 10 11 Ω·m, 2.5 × 10 11 Ω·m), the moisture content is ≤ 0.10%, the combustible content is ≤ 0.5%, and the elastic modulus is 75 GPa to 85 GPa (such as 78 GPa, 80 GPa).

[0032] In some embodiments, the linear density of the basalt fiber is 2400 tex to 4800 tex, the single fiber diameter is 13 to 16 μm, the resistivity is ≥ 1 × 10 12 Ω·m, the moisture content is ≤ 0.10%, the combustible content is ≤ 0.5%, and the elastic modulus is ≥ 90 GPa. In some embodiments, the linear density of the basalt fiber is 2400 tex to 4800 tex, the single fiber diameter is 13 to 16 μm, and the resistivity is 1 × 10 12 Ω·m to 5 × 10 12 Ω·m (such as 3.5 × 10 12 Ω·m, 3.7 × 10 12 Ω·m, 4 × 10 12 Ω·m, 4.5 × 10 12 Ω·m), the moisture content is ≤ 0.10%, the combustible content is ≤ 0.5%, and the elastic modulus is 90 GPa to 105 GPa (such as 94 GPa, 98 GPa, 102 GPa).

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

[0034] In some embodiments, the insulating boom is prepared by a method comprising the following steps:

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

[0036] 2) Wind the fiber tow impregnated with resin on the core mold according to the set winding direction and winding thickness;

[0037] 3) Provide a wear-resistant layer, and perform surface treatment on the wear-resistant layer using atmospheric pressure plasma. The treatment voltage is 20 - 40 V, the treatment time is 10 - 15 min, and within 1 min after the treatment is completed, lay the wear-resistant layer on the surface of the fiber matrix sample obtained in 2);

[0038] 4) Use an outer mold to compact the wear-resistant layer and the fiber matrix as a whole to discharge the excess resin;

[0039] 5) Cure, the curing temperature is 80 - 140 °C, and the curing time is 2 - 4 h.

[0040] This application also relates to a method for preparing the insulating boom, comprising:

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

[0042] 2) Wind the fiber tow impregnated with resin on the core mold according to the set winding direction and winding thickness;

[0043] 3) Provide a wear-resistant layer, and perform surface treatment on the wear-resistant layer using atmospheric pressure plasma. The treatment voltage is 20 - 40 V, the treatment time is 10 - 15 min, and within 1 min after the treatment is completed, lay the wear-resistant layer on the surface of the fiber matrix sample obtained in 2);

[0044] 4) Use an outer mold to compact the wear-resistant layer and the fiber matrix as a whole to discharge the excess resin;

[0045] 5) Cure, the curing temperature is 80 - 140 °C, and the curing time is 2 - 4 h.

[0046] In some embodiments, in the above step 2), the winding tension of the fiber is controlled to be 18% - 22% of the fiber strength. In some embodiments, in the above step 2), the winding direction of the fiber is measured by the angle between the fiber and the central axis of the core mold. First, wind n1 layers in the direction of 40° - 50° (for example, 45°), then wind n2 layers in the direction of -1° - 1° (for example, 0°), and then wind n3 layers in the direction of 85° - 95° (for example, 90°). The ratio of n1:n2:n3 is 1:4 - 6:3 - 5; wind in this way for 4 - 6 cycles, and the total winding thickness of the fiber is 15 - 20 mm.

[0047] This application also relates to a telescopic boom aerial work platform, including the insulating boom described in any embodiment of this application. In some embodiments, the telescopic boom aerial work platform is a telescopic boom insulated bucket truck.

[0048] In this application, the "insulating boom" is a hollow boom profile made of insulating material, and its cross-section can be rectangular or circular. It plays a role in load-bearing and insulation, and is used for aerial work platforms with insulating booms, such as insulated bucket trucks, to achieve safe operation on high-voltage live bodies.

[0049] Advantageous technical effects of this application

[0050] The insulating boom provided by this application has high wear resistance and high insulation, and is suitable for telescopic boom aerial work platforms, especially telescopic boom insulated bucket trucks. It can solve problems such as fast wear and the need for repeated repairs caused by the telescopic movement of the boom, can reduce the external wear caused by the telescopic movement of the boom, improve the reliability of the overall machine operation, and reduce maintenance costs.

[0051] Compared with conventional insulating booms, the insulating boom provided by this application also has the advantage of anti-collision and has extremely strong environmental adaptability.

[0052] This application can greatly improve the bonding strength between the wear-resistant layer and the fiber matrix of the boom through plasma surface treatment, make the wear-resistant layer and the fiber matrix closely composite, and ensure the wear-resistant performance of the boom and the reliability of telescopic operation. Description of the drawings

[0053] Figure 1 is a schematic cross-sectional structure diagram of an insulating boom in the prior art.

[0054] Figure 2 is a schematic cross-sectional structure diagram of the insulating boom in the embodiment of this application.

[0055] Description of reference numerals: 1, core mold; 2, fiber matrix; 3, wear-resistant layer. Detailed implementation manners

[0056] The following will further illustrate the substantive content of this application in combination with specific embodiments of this application. It should be understood that the following embodiments are only used to illustrate this application, but do not limit the protection scope of this application. For those conditions not specified in the following embodiments, they shall be carried out according to the conventional conditions or those recommended by the manufacturer. For the raw materials whose manufacturers are not specified, they are all conventional products that can be obtained through market purchase.

[0057] Although many of the materials and operation methods used in the following embodiments are well known in the art, this application still describes them in as much detail as possible here. Those skilled in the art are aware that if not otherwise specified, the materials and operation methods used in the following embodiments are well known in the art.

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

[0059] The first embodiment of this application provides an insulating boom, as Figure 2 shown, including a fiber matrix and a wear-resistant layer. The wear-resistant layer is wrapped on the surface of the fiber matrix. The wear-resistant layer includes polyether ether ketone or polyimide, and the bonding strength between the wear-resistant layer and the fiber matrix is ≥25 MPa.

[0060] The wear-resistant layer of this application includes polyether ether ketone or polyimide, which are materials with high insulation and high wear resistance. Therefore, after setting the wear-resistant layer of this application, not only can the coating of gel coat be reduced, but also the surface wear resistance, impact resistance and anti-smashing performance of the insulating boom can be improved, the bump damage of the insulating boom can be reduced, and at the same time, the insulating boom has excellent insulation performance, can better isolate current, and reduce the risks of electric leakage and burns.

[0061] The greater the thickness of the wear-resistant layer, the better the durability of wear resistance. In some embodiments, the thickness of the wear-resistant layer is 1 mm - 5 mm, preferably 2 mm - 4 mm. It can not only meet the wear resistance requirements within the normal working life of the insulating boom, but also will not increase the material cost and volume of the insulating boom.

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

[0063] In some embodiments, the wear-resistant layer is a wear-resistant plate. Preferably, the above polyether ether ketone comes from polyether ether ketone plates and / or the polyimide comes from polyimide plates, or in other words, the polyether ether ketone is a polyether ether ketone plate and the polyimide is a polyimide plate. Using a plate structure to provide the wear-resistant layer to form a wear-resistant plate is beneficial to the processing of the insulating boom. Moreover, forming the wear-resistant layer with a plate has better integrity of the wear-resistant layer compared to coating the wear-resistant layer, so it is less likely to be worn and maintains the long-term high insulation of the insulating boom.

[0064] In some embodiments, in order to further improve the bonding strength between the plate and the fiber matrix, it is preferred that the surface of the polyetheretherketone plate or the polyimide plate in contact with the fiber matrix is treated by plasma, preferably by atmospheric pressure plasma. The plasma treatment is used to hydrophilize the surface of the plate, so that the plate and the fiber matrix form a better bond, and the overall firmness of the two is increased. When the insulating boom is working under force, they have the same deformation amount, so that the insulation is better maintained.

[0065] The above plasma treatment can refer to the conventional plasma process. For example, the atmospheric pressure plasma is the atmospheric pressure plasma formed by carbon dioxide, methane or argon. It is preferred that the surface of the polyetheretherketone plate or the polyimide plate in contact with the fiber matrix is treated by atmospheric pressure plasma for 10 min - 15 min under the condition that the voltage is 20 V - 40 V. This can achieve sufficient bombardment and roughening of the plate surface, and can also avoid breakdown of the local part of the plate.

[0066] Of course, the methods that can improve the bonding strength between the plate and the fiber matrix are not limited to the above plasma treatment. Acid-base treatment, sandblasting treatment, ion beam bombardment treatment or surface grafting modification of the plate, or using a highly adhesive binder or ultrasonic welding can all improve the bonding strength between the plate and the fiber matrix.

[0067] In some embodiments, in order to further increase the tight wrapping of the polyetheretherketone and the polyimide with the fiber matrix and the firmness of their combination, thermoplastic polyetheretherketone and thermoplastic polyimide are selected.

[0068] In some embodiments, the wear-resistant layer is bonded to the fiber matrix through a first adhesive. Preferably, the first adhesive includes resin, and further preferably, the first adhesive includes epoxy resin or vinyl ester resin.

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

[0070] The above first adhesive can be the adhesive added between the fiber matrix and the wear-resistant layer during the preparation process, or can come from the second adhesive used for impregnating the fibers in the fiber matrix.

[0071] The adhesive in the above fiber matrix can be selected from the conventional adhesive materials of the insulating boom. For example, the second adhesive includes resin. In some embodiments, the second adhesive includes epoxy resin or vinyl ester resin. In some embodiments, a resin with a flexural strength of 140 MPa - 160 MPa is selected.

[0072] In some embodiments, the fibers include glass fibers and basalt fibers. Basalt fibers have higher rigidity than glass fibers, so they can withstand greater pressure and torsional forces, improving the load-bearing capacity of the insulating boom.

[0073] In some embodiments, by using the proportion combination of glass fibers and basalt fibers, on the basis of improving the rigidity of the insulating boom, it is made as lightweight and low-cost as possible. Preferably, the mass ratio of glass fibers to basalt fibers is 2:(5 - 1.5).

[0074] In some embodiments, the above-mentioned insulating boom extends in the first direction, and at least part of the glass fibers has an angle α with the first direction, 75° ≤ α ≤ 105°, preferably 85° ≤ α ≤ 95°.

[0075] In some embodiments, the insulating boom extends in the first direction, and at least part of the basalt fibers has an angle β with the first direction, -10° ≤ β ≤ 10°, preferably -5° ≤ β ≤ 5°. The above-mentioned basalt fibers can provide strong rigidity for the insulating boom. When the insulating boom is used in a work vehicle, it provides good rigid support for carrying operators and improves work safety.

[0076] In some embodiments, preferably, the remaining part of the basalt fibers has an angle γ with the first direction, 40° ≤ γ ≤ 50°, preferably satisfying 42° ≤ γ ≤ 48°. The above-mentioned basalt fibers provide strong anti-torsion performance for the insulating boom, and can reduce the deformation amount of the insulating boom caused by hanging items when the insulating boom needs to hang items, improving the working stability of the insulating boom.

[0077] It should be noted that the positive angles in the above angles represent the angles formed by counterclockwise rotation with the straight line where the first direction is located as the starting line, and the negative angles in the above angles represent the angles formed by clockwise rotation with the straight line where the first direction is located as the starting line.

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

[0079] The above-mentioned glass fibers and basalt fibers cooperate with each other, not only providing strong insulation performance for the insulating boom, but also improving its mechanical properties, providing rigid support and anti-torsion support for the insulating boom to meet various work requirements. In order to give full play to the advantages of the overall fibers, in some embodiments, the part of the basalt fibers with an angle β with the first direction is defined as the first part of the fibers, and the part of the basalt fibers with an angle γ with the first direction is defined as the second part of the fibers. Preferably, the ratio of the number of layers of the second part of the fibers, the number of layers of the glass fibers to the number of layers of the first part of the fibers is 1:(2 - 5):(3 - 10), preferably 1:(3 - 5):(5 - 10).

[0080] The fiberglass used in this application can be selected from conventional fiberglass for insulating booms. In some embodiments, the fiberglass satisfies any one or more of the following characteristics:

[0081] 1) The fiberglass is E-grade fiberglass;

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

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

[0084] 4) The resistivity of the fiberglass ≥ 1×10 11 Ω·m;

[0085] 5) The elastic modulus of the fiberglass ≥ 75 GPa

[0086] 6) The moisture content of the fiberglass ≤ 0.10%;

[0087] 7) The combustible content of the fiberglass ≤ 0.5%.

[0088] The basalt fiber used in this application can be selected from conventional basalt fibers. In some embodiments, the basalt fiber satisfies any one or more of the following characteristics:

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

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

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

[0092] 4) The elastic modulus ≥ 90 GPa

[0093] 5) The moisture content ≤ 0.10%;

[0094] 6) The combustible content ≤ 0.5%.

[0095] To facilitate the installation of insulation comparison, in some embodiments, along the extension direction of the fiber, the fiber matrix has a hollow cavity. For example, a hollow cavity that penetrates along the extension direction of the fiber.

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

[0097] The second embodiment of the present application provides a telescopic boom working vehicle, including a telescopic insulating boom, and the telescopic insulating boom includes the insulating boom frame provided in the above-mentioned first embodiment.

[0098] In some embodiments, the above-mentioned telescopic boom working vehicle is a telescopic boom aerial work vehicle, preferably a telescopic insulating bucket boom vehicle. This telescopic insulating bucket boom vehicle has high insulation, the outside of the telescopic boom is wear-resistant, the reliability of the whole machine operation is high, and the maintenance cost is low.

[0099] The third embodiment of the present application also provides a manufacturing method for any one of the above-mentioned insulating boom frames, and this manufacturing method includes:

[0100] Prepare a fiber matrix precursor;

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

[0102] Wrap the wear-resistant layer on the fiber matrix precursor and perform film pressing and curing. The wear-resistant layer is bonded to the fiber matrix as a whole, and the bonding strength is good, which is beneficial to the exertion of the advantages of the wear-resistant layer.

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

[0104] Brush a release agent on the surface of the core mold;

[0105] Wind the fiber tow impregnated with the binder precursor on the core mold according to the set winding direction and winding thickness. The winding tension is controlled at 18%-22% of the strength of the fiber tow, and the total fiber winding thickness is 15mm-20mm to obtain a fiber matrix precursor.

[0106] The above-mentioned release agent can refer to conventional release agents, and the present application will not elaborate.

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

[0108] In some embodiments, 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, where n1:n2:n3 is 1:(3 - 10):(2 - 5), preferably 1:(5 - 10):(3 - 5), and repeating the winding 4 - 6 cycles. The fiber layers are cross - arranged in the above - mentioned manner so that the functions of each layer cooperate with each other. Of course, the order in the above - mentioned winding process is not fixed and can also be adjusted.

[0109] In some embodiments, the binder precursor includes a resin, and the resin includes epoxy resin and / or vinyl ester resin. Preferably, the flexural strength of the epoxy resin or vinyl ester resin ≥ 140 MPa; to improve the sufficient support for the fibers.

[0110] To accelerate the resin curing, in some embodiments, preferably, the binder precursor further includes 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, methyltetrahydrophthalic anhydride, methylhexahydrophthalic anhydride) or a peroxide curing agent (such as methyl ethyl ketone peroxide, cyclohexanone peroxide, methyl ethyl ketone peroxide, benzoyl peroxide), and the accelerator includes cobalt naphthenate, cobalt isooctanoate, dimethylaniline or diethylaniline. In some embodiments, the curing agent is methyl ethyl 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 a wear - resistant layer on the fiber matrix precursor and performing film - pressing curing includes:

[0113] Wrap the wear - resistant plate on the surface of the fiber matrix precursor and compact it to obtain a compacted part;

[0114] Cure the compacted part. Preferably, the curing temperature is 80°C - 140°C, and the preferably curing time is 2 h - 4 h.

[0115] Utilize the flexibility of the wear - resistant plate to wrap it on the fiber matrix precursor, then compact and cure it. 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 wrap the fiber matrix precursor in the form of one piece or multiple pieces. Whether it is one piece or multiple pieces, it has the advantages of better integrity and better impact resistance compared with the coating method.

[0116] Moreover, when the wear-resistant layer is provided by coating, the wear-resistant material to be coated requires curing operations, time, and processes. Especially when the curing conditions of the resin in the fiber matrix are different from those of the wear-resistant material (such as polyether ether ketone or polyimide), the process operations become more complex. The above-mentioned form of the wear-resistant plate can overcome the above problems.

[0117] In some embodiments, the wear-resistant plate is a wear-resistant plate whose surface has been treated with atmospheric pressure plasma. The treatment voltage is 20V - 40V, the treatment time is 10min - 15min, and the wear-resistant plate is laid on the surface of the fiber matrix precursor within 1 minute after the treatment. To improve the surface roughness of the wear-resistant plate and increase the bonding strength with the fiber matrix.

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

[0119] As Figure 2 shown, in some embodiments of the present application, an insulating boom for a telescopic boom type aerial work vehicle (such as a telescopic insulating bucket boom vehicle) is composed of a hollow fiber matrix 2 and a wear-resistant plate 3. 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 ≥25MPa.

[0120] In certain 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 polyimide plate in contact with the fiber matrix 2 has been treated with atmospheric pressure plasma. Plasma surface treatment can greatly improve the bonding strength between the wear-resistant layer 3 and the fiber matrix 2, ensuring the wear resistance of the boom and the reliability of the telescopic operation.

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

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

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

[0124] In certain embodiments, the wear-resistant layer 3 is a plate made of polyether ether ketone, and its resistivity is 1×10 14 Ω·m - 5×1014 Ω·m (e.g., 2.6×10 14 Ω·m); or the wear-resistant layer 3 is a plate made of polyimide material, and its resistivity is 1×10 15 Ω·m to 10×10 15 Ω·m (e.g., 5.8×10 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 by a method including the following steps.

[0127] 1) Brush a release agent on the surface of the core mold 1.

[0128] 2) Wind the fiber filaments impregnated with resin on the core mold according to the set winding direction and winding thickness. The winding tension is controlled at 18% - 22% of the fiber strength. The winding direction of the fiber is calculated by the angle between the fiber and the central axis of the core mold. First, wind n1 layers in the direction of 40° - 50° (e.g., 45°), then wind n2 layers in the direction of -1° - 1° (e.g., 0°), and then wind n3 layers in the direction of 85° - 95° (e.g., 90°). n1:n2:n3 is 1:4 - 6:3 - 5; wind 4 - 6 cycles in this way, and the total winding thickness of the fiber is 15 - 20 mm.

[0129] In some embodiments, in step 2) above, the fiber first winds 1 layer in the direction of +45° (or -45°), then winds 5 layers in the direction of 0°, and then winds 4 layers in the direction of 90°, and winds 4 cycles in total, and the total winding thickness of the fiber is 15 mm.

[0130] In some embodiments, the fiber is composed 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 composed of glass fiber and basalt fiber in a ratio of 2:0.5 - 1.5. In some embodiments, the fiber is composed 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, methyl tetrahydrophthalic anhydride, methyl hexahydrophthalic anhydride), or a peroxide curing agent (such as methyl ethyl ketone peroxide, cyclohexanone peroxide, methyl ethyl ketone peroxide, benzoyl peroxide). In certain embodiments, the reaction accelerator used for curing the resin is cobalt naphthenate, cobalt isooctanoate, dimethylaniline, or diethylaniline.

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

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

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

[0136] In certain embodiments, the resin is vinyl ester resin or epoxy resin, the curing agent is methyl ethyl ketone peroxide, and the accelerator is cobalt isooctanoate.

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

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

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

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

[0141] In some embodiments, the insulating boom is prepared by a method comprising the following steps,

[0142] 1) Brush a release agent on the surface of the core mold 1;

[0143] 2) Wind the fiber tow impregnated with resin on the core mold 1 according to the set winding direction and winding thickness;

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

[0145] 4) Use an outer mold to compact the wear-resistant layer 3 and the fiber matrix 2 as a whole to discharge the excess resin;

[0146] 5) Cure, with the curing temperature being 80 to 140 °C and the curing time being 2 to 4 h.

[0147] This application also relates to a method for preparing the insulating boom, comprising:

[0148] 1) Brush a release agent on the surface of the core mold 1;

[0149] 2) Wind the fiber tow impregnated with resin on the core mold 1 according to the set winding direction and winding thickness;

[0150] 3) Provide a wear-resistant layer 3, and perform surface treatment on the wear-resistant layer 3 using atmospheric pressure plasma. The treatment voltage is 20 - 40V, the treatment time is 10 - 15min, and within 1min after the treatment is completed, lay the wear-resistant layer 3 on the surface of the fiber matrix 2 sample obtained in 2);

[0151] 4) Use an external mold to compact the wear-resistant layer 3 and the fiber matrix 2 as a whole, and discharge the excess resin;

[0152] 5) Cure, the curing temperature is 80 - 140°C, and the curing time is 2 - 4h.

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

[0154] This application also relates to an articulated boom aerial work platform, including the insulating boom described in any embodiment of this application. In some embodiments, the articulated boom aerial work platform is an articulated boom insulating bucket truck. This articulated boom aerial work platform, especially the articulated boom insulating bucket truck, has high insulation, high wear resistance on the outside of the articulated boom, high reliability in the operation of the whole machine, and low maintenance cost.

[0155] Example 1

[0156] 1. Prepare raw materials

[0157] The reinforcing fiber is made by doping glass fiber and basalt fiber in a ratio of 2:1. The glass fiber is E-grade glass fiber, with a linear density of 2400tex, a single fiber diameter of 17μm, a resistivity of 1.8×10 11 Ω·m, a moisture content of 0.10%, a combustible content of 0.5%, and an elastic modulus of 78GPa (purchased from Tai'an Jufusheng New Materials Co., Ltd., Taishan Fiberglass TCR910 - 2400 - 17); the basalt fiber has a linear density of 2400tex, a single fiber diameter of 16μm, a resistivity of 3.5×10 12 Ω·m, a moisture content of 0.10%, a combustible content of 0.5%, and an elastic modulus of 98Gpa (purchased from Guizhou Shixin Basalt Technology Co., Ltd., roving 2400tex).

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

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

[0160] 2. Preparation of the insulating boom

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

[0162] 2) Mix the A and B components of the epoxy resin in a specified ratio through an automatic glue mixer and inject them into the glue tank for standby, for impregnating the fiber tow.

[0163] 3) Use the winding and laying machine to wind the fiber tow impregnated with resin on the metal core mold according to the set winding direction and laying thickness. The winding tension is controlled at 18% of the fiber strength. The winding direction of the fiber is measured by the angle between the fiber and the central axis of the core mold. First, wind the basalt fiber at +45° (or -45°) for 1 layer, then wind the basalt fiber at 0° for 5 layers, and then wind the glass fiber at 90° for 4 layers. This is repeated 4 times, and the total laying thickness is 15mm.

[0164] 4) Lay the prefabricated wear-resistant plate on the surface of the fiber matrix sample obtained in step 3). Among them, use atmospheric pressure methane plasma to perform surface treatment on the plate made of polyether ether ketone. The treatment voltage is 40V, and the treatment time is 10min to obtain the prefabricated wear-resistant plate. The wear-resistant plate is laid within 1min 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. The curing temperature is 100°C, and the curing time is 2h.

[0167] Example 2

[0168] 1. Prepare raw materials

[0169] The reinforcing fiber is selected as 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 2400tex, a single fiber diameter of 14μm, and a resistivity of 1.5×10 11Ω·m, with a moisture content of 0.10%, a combustible content of 0.5%, and an elastic modulus of 80 GPa (purchased from Tai'an Jufusheng New Materials Co., Ltd., Taishan EDR240); the basalt fiber has a linear density of 4800 tex, a single fiber diameter of 14 μm, and a resistivity of 3.5×10 12 Ω·m, with a moisture content of 0.10%, a combustible content of 0.5%, and an elastic modulus of 94 GPa (purchased from Guizhou Shixin Basalt Technology Co., Ltd., untwisted roving 4800 tex).

[0170] The resin is vinyl resin, with the brand name of Reichhold 430. The curing agent is methyl ethyl ketone peroxide, and the accelerator is cobalt isooctanoate. The weight ratio of resin:curing agent:accelerator is 100:23:0.8.

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

[0172] 2. Preparation of the insulating boom

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

[0174] 2) Mix and inject raw materials such as resin, curing agent, and accelerator into the glue tank through an automatic glue mixer according to the specified ratio for standby, and use them to impregnate the fiber bundles;

[0175] 3) Use the winding and laying machine to wind and lay the fiber bundles impregnated with resin on the metal core mold according to the set winding direction and laying thickness. The winding tension is controlled at 20% of the fiber strength. The winding direction of the fiber is measured by the angle between the fiber and the central axis of the core mold. First, wind the basalt fiber at +45° (or -45°) for 1 layer, then wind the basalt fiber at 0° for 5 layers, and then wind the glass fiber at 90° for 4 layers. Repeat this cycle 4 times, and the total laying thickness is 15 mm;

[0176] 4) Lay the prefabricated wear-resistant plate on the surface of the fiber matrix sample obtained in step 3). Among them, use atmospheric pressure carbon dioxide plasma to perform surface treatment on the polyimide material plate. The treatment voltage is 20 V, and the treatment time is 15 min to obtain the prefabricated wear-resistant plate. Lay the wear-resistant plate within 1 min after the treatment is completed;

[0177] 5) Use an external 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;

[0178] 6) Transfer the boom sample obtained in step 5) as a whole into an oven for curing. The curing temperature is 110 °C and the curing time is 2.5 h.

[0179] Example 3

[0180] 1. Prepare raw materials

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

[0182] The resin is epoxy resin, with the grade of Shangwei 2513-A / 2513-BL, and the weight ratio of A and B materials 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), with a resistivity of 2.6×10 14 Ω·m. It consists of four plates with dimensions of 5000 mm×300 mm×2 mm, 5000 mm×300 mm×2 mm, 5000 mm×204 mm×2 mm, and 5000 mm×204 mm×2 mm respectively. The joints of the four plates are chamfered.

[0184] 2. Preparation of the insulating boom

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

[0186] 2) Mix the A and B components of the epoxy resin according to the specified ratio through an automatic glue mixer and inject them into the glue tank for standby, for impregnating the fiber tow;

[0187] 3) Use a winding and laying machine to wind the fiber tow impregnated with resin on the metal core mold according to the set winding direction and laying thickness. The winding tension is controlled at 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 core mold. First, wind the basalt fiber at +45° (or -45°) for 1 layer, then wind the basalt fiber at 0° for 5 layers, and then wind the glass fiber at 90° for 4 layers. Repeat this cycle 4 times, and the total laying thickness is 15 mm;

[0188] 4) Lay the prefabricated wear-resistant plate on the surface of the fiber matrix sample obtained in step 3). Among them, use atmospheric pressure methane plasma to perform surface treatment on the plate made of polyether ether ketone. The treatment voltage is 30 V and the treatment time is 12 min to obtain the prefabricated wear-resistant plate. Lay the wear-resistant plate within 1 min after the treatment is completed;

[0189] 5) Use an external 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;

[0190] 6) Move the boom sample obtained in step 5) as a whole into an oven 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, change the process of step 3) as follows:

[0193] Use a winding and laying machine to wind the fiber tow impregnated with resin on the metal core mold according to the set winding direction and laying thickness. The winding tension is controlled at 18% of the fiber strength. The winding direction of the fiber is measured by the angle between the fiber and the central axis of the core mold. First, wind the basalt fiber at 0° for 6 layers, then wind the glass fiber at 90° for 4 layers. Repeat this cycle 4 times, and the total laying thickness is 15 mm.

[0194] The rest is the same as in Example 1.

[0195] Example 5

[0196] On the basis of Example 1, change the process of step 3) as follows:

[0197] Use a winding and laying machine to wind the fiber tow impregnated with resin on the metal core mold according to the set winding direction and laying thickness. The winding tension is controlled at 18% of the fiber strength. The winding direction of the fiber is measured by the angle between the fiber and the central axis of the core mold. First, wind the basalt fiber at +45° (or -45°) for 6 layers, then wind the glass fiber at 90° for 4 layers. Repeat this cycle 4 times, and the total laying thickness is 15 mm.

[0198] Example 6

[0199] The difference from Example 1 is that the polyetheretherketone (PEEK) material plate was not treated with atmospheric pressure methane plasma, but instead, the surface of the PEEK material plate in contact with the fiber matrix was etched using 98% concentrated sulfuric acid, and the rest was the same as in Example 1.

[0200] Comparative Example 1

[0201] Compared with Example 1, the insulating boom of Comparative Example 1 differed only in that a PEEK wear-resistant plate was not used, but a polyester resin (purchased from Changzhou Diyou New Materials Co., Ltd., with main components including polyester, styrene, and color powder) was sprayed on the surface of the fiber matrix to form a resin coating, and all other processes were the same.

[0202] Comparative Example 2

[0203] Compared with Example 1, the insulating boom of Comparative Example 2 differed only in that the PEEK wear-resistant plate was not subjected to atmospheric pressure methane plasma surface treatment, and all other processes were the same.

[0204] Performance Test

[0205] The insulating booms prepared in Examples 1-6 and Comparative Examples 1-2 were subjected to installation verification and insulation performance testing, and the results are shown in Table 1.

[0206] Table 1 Comparison of Boom Performance Prepared in Examples and Comparative Examples of the Present Application

[0207]

[0208]

[0209] The above installation verification was carried out by loading the insulating boom on a XCMG GKJH21GZL0 type aerial work platform for operation verification.

[0210] The test results showed that compared with Comparative Example 1, the insulating boom prepared in the examples of the present application had advantages such as good wear resistance and excellent insulation performance, which could reduce the external wear caused by telescoping to the boom, improve the reliability of the whole machine operation, and reduce the maintenance cost; compared with Comparative Example 2, the application of atmospheric pressure plasma for surface treatment of the wear-resistant layer or using concentrated sulfuric acid for surface treatment of the wear-resistant layer in the examples of the present application could greatly improve the bonding strength between the wear-resistant layer and the fiber layer matrix, and ensure the wear resistance of the boom and the reliability of the whole machine operation.

[0211] The above embodiments are only the preferred embodiments of the present application. It should be noted that the above preferred embodiments should not be construed as limiting the present application, and the protection scope of the present application should be subject to the scope defined by the claims. For those of ordinary skill in the art, several improvements can be made without departing from the spirit and scope of the present application, and these improvements should also be regarded as within 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 on 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-5 mm and / or the thickness of the fiber matrix is ​​15 mm-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 treated with plasma, preferably 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 the polyimide sheet in contact with 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 to each other via 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 have an angle β with the first direction, -10°≤β≤10°, preferably -5°≤β≤5°; Preferably, the remaining part of the basalt fibers has an angle γ with the first direction, 40°≤γ≤50°, preferably 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 that have an angle β with the first direction is defined as a first portion of fibers, and the portion of basalt fibers that have 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 support 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 frame 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 an 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 mold release agent on the surface of the core mold; The fiber bundle impregnated with the binder precursor is laid 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 bundle, and the total laying thickness of the fiber 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 between the winding direction of the glass fiber bundle and the central axis of the core mold is α, 75°≤α≤105°, preferably 85°≤α≤95°; Preferably, the angle between part of the basalt fiber bundles and the central axis of the core mold is β, -10°≤β≤10°, and further preferably -5°≤β≤5°; Preferably, the angle between the remaining part of the basalt fiber and the central axis of the core mold is γ, 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 for 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 cyclohexaneate, 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 the curing temperature is 80° C.-140° C., and preferably the curing time is 2 h-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 10-15min, and the wear-resistant plate is laid on the surface of the fiber matrix precursor within 1min after the treatment.

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