Fiber composite material arm support, engineering machinery and preparation method of fiber composite material arm support

Abstract

The invention relates to the field of engineering machinery manufacturing, and discloses a fiber composite material arm support, engineering machinery and a preparation method of the fiber composite material arm support, and the peripheral wall of the fiber composite material arm support comprises a fiber composite material layer, a fiber composite material layer and a fiber composite material layer, the inner metal mesh layer is embedded in the inner periphery of the fiber composite layer; and the outer metal mesh layer is embedded in the periphery of the outer metal mesh layer. The inner metal mesh layer and the outer metal mesh layer respectively comprise metal meshes formed by weaving metal wires, and the fiber composite material layer is formed by curing fibers wound on the periphery of the inner metal mesh layer. According to the fiber composite boom, the engineering machinery and the preparation method of the fiber composite boom, the metal mesh layers are arranged on the inner periphery and the outer periphery of the fiber composite layer correspondingly, the wear resistance of the boom under long-period telescopic reciprocating use can be improved, the service life of the telescopic boom can be prolonged, and the safety and reliability of the telescopic boom can be improved.

Description

Technical Field

[0001] The present application belongs to the field of engineering machinery manufacturing, and specifically relates to a fiber composite boom, engineering machinery, and a method for preparing the fiber composite boom. Background Art

[0002] Boom structures are mostly used in engineering vehicles and other means of transportation, and are important load-bearing structural parts. Booms are divided into two categories: folding arms and telescopic arms. Compared with folding arms, telescopic arms are more suitable for narrow working environments and are easier to control vertical take-off and landing. However, traditional metal telescopic arms are heavy and prone to fatigue, which has a greater impact on the stability of the entire machine. Carbon fiber has the advantages of light weight, high specific strength, and good fatigue resistance, and is more suitable as the main structural material of telescopic arms. During the use of carbon fiber telescopic arms, due to the long-term extrusion and expansion between the surfaces of the telescopic arms, obvious friction damage is easily caused, and the wear resistance of carbon fiber itself is poor. Under such long-term telescopic application conditions, it is inevitable that the main structure of the carbon fiber telescopic arm will be seriously damaged, affecting the life of the telescopic arm, and it is easy to cause dangerous accidents such as "boom collapse". Summary of the invention

[0003] The purpose of the present application is to provide a fiber composite boom, engineering machinery and a method for preparing the fiber composite boom, which are beneficial to improving the life and safety reliability of the telescopic boom.

[0004] In order to achieve the above-mentioned object, the first aspect of the present application provides a fiber composite arm support, the peripheral wall of the fiber composite arm support comprises:

[0005] The fiber composite layer is formed by curing the fiber composite;

[0006] An inner metal grid layer, embedded in the inner periphery of the fiber composite layer;

[0007] The outer metal grid layer is embedded in the outer periphery of the fiber composite material layer.

[0008] In some specific embodiments, the fiber composite layer is formed by solidifying the fiber composite wound around the outer periphery of the inner metal grid layer.

[0009] In some specific embodiments, the fiber composite layer includes a first angle fiber composite layer and a second angle fiber composite layer having different winding angles, wherein the winding angle of the first angle fiber composite layer is greater than 0° and less than or equal to 30°, and the winding angle of the second angle fiber composite layer is greater than 45° and less than or equal to 90°; and / or,

[0010] The fiber material of the fiber composite layer includes one or more of carbon fiber, glass fiber and aramid fiber; and / or,

[0011] The material of the matrix of the fiber composite layer includes one or more of epoxy resin, unsaturated resin and phenolic resin.

[0012] In some specific embodiments, the inner metal grid layer and the outer metal grid layer respectively include metal grids, and the matrix of the fiber composite is partially filled into the metal grids during the curing process.

[0013] In some specific embodiments, the metal grid is woven from metal wires, wherein:

[0014] The cross-sectional diameter of the metal wire is greater than or equal to 1 mm and less than or equal to 2 mm; and / or,

[0015] The material of the metal wire is one or more of wear-resistant high-strength steel, aluminum alloy and magnesium alloy; and / or,

[0016] The hardness of the metal wire is greater than or equal to 45HRC and less than or equal to 64HRC; and / or,

[0017] The metal grid includes a grid, and the area of ​​a single grid is greater than or equal to 1 mm 2 And less than or equal to 10mm 2 .

[0018] In some specific embodiments, the embedding degree of the inner metal grid layer in the fiber composite layer is greater than or equal to 30% and less than or equal to 70%, the embedding degree of the outer metal grid layer in the fiber composite layer is greater than or equal to 30% and less than or equal to 70%, the embedding degree of the inner metal grid layer is the ratio of the thickness of the inner metal grid layer embedded in the fiber composite layer to the thickness of the inner metal grid layer, and the embedding degree of the outer metal grid layer is the ratio of the thickness of the outer metal grid layer embedded in the fiber composite layer to the thickness of the outer metal grid layer.

[0019] A second aspect of the present application further provides an engineering machine, the engineering machine comprising the fiber composite boom according to any one of claims 1 to 6.

[0020] The third aspect of the present application further provides a method for preparing a fiber composite boom, the method for preparing the fiber composite boom comprising:

[0021] Prepare the mandrel mold;

[0022] Disposing an inner metal grid on the mandrel mold;

[0023] Winding a fiber composite material around the outer periphery of the inner metal grid along the circumference of the mandrel mold to form a fiber winding structure;

[0024] An outer metal grid is arranged at the outer periphery of the fiber winding structure, and the inner metal grid, the fiber winding structure and the outer metal grid form an arm blank;

[0025] The arm blank is heated and cured to form a fiber composite arm, wherein the peripheral wall of the fiber composite arm comprises an inner metal grid layer, a fiber composite layer and an outer metal grid layer in sequence.

[0026] In some specific embodiments, the step of winding fibers around the outer periphery of the inner metal grid along the circumference of the mandrel mold to form a fiber winding structure includes:

[0027] The winding tension of the fiber winding structure is determined according to the set embedding degree of the inner metal grid layer in the fiber composite layer, the area of ​​a single grid of the inner metal grid, and the cross-sectional diameter and hardness of the metal wires of the inner metal grid.

[0028] In some specific embodiments, the step of winding fibers around the outer periphery of the inner metal grid along the circumference of the mandrel mold to form a fiber winding structure includes:

[0029] The fiber composite is successively wound at different winding angles on the outer side of the metal grid along the circumference of the mandrel mold to form a fiber winding structure, wherein the fiber winding structure includes a first angle fiber winding structure and a second angle fiber winding structure with different winding angles.

[0030] In some specific embodiments, the outer metal grid is provided at the outer periphery of the fiber winding structure, including:

[0031] fixing an outer metal grid on the outer periphery of the fiber winding structure;

[0032] A vacuum bag is sleeved on the outer metal grid, and the vacuum bag is evacuated to a set pressure to embed the outer metal grid into the outer periphery of the fiber winding structure. The set pressure is determined according to the set embedding degree of the outer metal grid layer in the fiber composite layer, the area of ​​a single grid of the outer metal grid, and the cross-sectional diameter and hardness of the metal wire of the outer metal grid.

[0033] Through the above technical solution, metal mesh layers are respectively arranged on the inner periphery and the outer periphery of the fiber composite layer of the fiber composite boom. The metal mesh layer has good wear resistance, which can improve the wear resistance of the boom under long-term telescopic reciprocating use, effectively protect the main structure of the boom, extend the service life of the boom, and improve the safety and reliability of the use of the boom.

[0034] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without creative work. In the drawings:

[0036] Figure 1 A schematic cross-sectional view of a fiber composite boom according to a specific embodiment of the present application is shown;

[0037] Figure 2 Shows Figure 1 Schematic diagram of the cross section of the fiber composite boom during deformation;

[0038] Figure 3 Shows Figure 1 A partial enlarged schematic diagram of the fiber composite boom;

[0039] Figure 4 A schematic structural diagram of a mandrel mold of a method for preparing a fiber composite arm support of the present application is shown;

[0040] Figure 5 A cross-sectional schematic diagram showing the arrangement of an inner metal grid on a mandrel mold is shown;

[0041] Figure 6 A schematic structural diagram of a first angle fiber winding structure is shown;

[0042] Figure 7 shows a schematic structural diagram of a second angle fiber winding structure;

[0043] Figure 8 A cross-sectional schematic diagram showing a fiber winding structure arranged on an inner metal grid;

[0044] Fig. 9 A cross-sectional schematic diagram showing the arrangement of an outer metal grid on a fiber-wound structure is shown.

[0045] Description of Reference Numerals

[0046] 101 inner metal grid layer 102 fiber composite material layer

[0047] 1021 first angle fiber winding structure 1022 second angle fiber winding structure

[0048] 103 outer metal grid layer 104 metal grid

[0049] 105 base 200 mandrel mold

[0050] 201 Mandrel 202 Winding Mold DETAILED DESCRIPTION

[0051] The specific implementation of the present application is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present application, and is not used to limit the present application.

[0052] In the prior art, in order to improve the wear resistance of the wear-resistant surface of the telescopic arm, some solutions use bolts to fix the wear-resistant plate on the contact surface between the telescopic arm and the slideway to reduce the wear of the telescopic arm during the friction process. However, the bolt structure needs to drill holes on the carbon fiber, which destroys the carbon fiber as a whole and reduces the bearing capacity of the carbon fiber. In addition, if the fastening bolt breaks, it is difficult to remove the broken bolt, causing uncertain danger. In addition, in order to improve the wear resistance of carbon fiber, another part of the solution achieves the improvement of the wear resistance of carbon fiber by impregnating polyimide sizing agent and attaching it to the surface of carbon fiber filaments. This method of preparing carbon fiber telescopic arms can ensure the integrity of the arm. However, the use of polyimide sizing agent itself is expensive, and the friction parts of the telescopic arm in actual working conditions are only the inner and outer surfaces in contact with the slider, and there is no need to improve the wear resistance of the entire telescopic arm frame, which greatly increases the preparation cost and also causes a waste of resources.

[0053] In view of this, if Figure 1 As shown, the present application provides a novel fiber composite arm support, the peripheral wall of the fiber composite arm support includes a fiber composite layer 102, an inner metal grid layer 101 and an outer metal grid layer 103, the fiber composite layer 102 is formed by solidifying the fiber composite, the inner metal grid layer 101 is embedded in the inner periphery of the fiber composite layer 102, and the outer metal grid layer 103 is embedded in the outer periphery of the fiber composite layer 102.

[0054] Since metal grid layers are respectively arranged at the positions corresponding to the contact surface of the slider on the inner and outer peripheries of the fiber composite layer of the fiber composite boom, and the metal grid layers are made of metal and have good wear resistance, the wear resistance of the boom under long-term telescopic reciprocating use can be greatly improved, thereby effectively protecting the main structure of the boom, extending the service life of the boom, and improving the safety and reliability of the use of the boom. In addition, the inner metal grid layer 101 and the outer metal grid layer 103 are respectively embedded in the fiber composite layer 102, which can improve the bonding strength between the inner metal grid layer 101 and the outer metal grid layer 103 and the fiber composite layer 102, thereby further improving the safety and reliability of the fiber composite boom.

[0055] At the same time, since the fiber composite layer 102 of the fiber composite boom is formed by solidifying the fiber composite, the fiber composite boom has good lightweight effect and high strength. In addition, the inner metal grid layer 101 and the outer metal grid layer 103 are formed by metal grids, which can further improve the lightweight effect of the fiber composite boom.

[0056] It should be noted that the shapes and structures of the fiber composite arm, the inner metal grid layer 101 and the outer metal grid layer 103 can be varied and can be set according to the actual application scenario and design requirements. For example, the fiber composite arm is cylindrical, and the cross section can be a circular ring, a rectangular ring, a trapezoidal ring or other irregular rings. The inner metal grid layer 101 and the outer metal grid layer 103 can be an integral component, or the inner metal grid layer 101 and the outer metal grid layer 103 can also be a split component group arranged at intervals.

[0057] In addition, the peripheral wall of the fiber composite arm includes an upper side wall, a left side wall, a lower side wall and a right side wall connected in sequence, and the inner metal grid layer 101 and the outer metal grid layer 103 can be respectively arranged on the upper side wall and the lower side wall of the fiber composite arm, or respectively arranged on the left side wall and the right side wall of the fiber composite arm, or respectively arranged on the upper side wall, the left side wall, the lower side wall and the right side wall of the fiber composite arm. The specific setting positions of the inner metal grid layer 101 and the outer metal grid layer 103 can be set according to the actual application scenario and design requirements, and the positions of the inner metal grid layer 101 and the outer metal grid layer 103 and the slider contact surface of the fiber composite arm can correspond.

[0058] In addition, before the fiber composite material is cured to form the fiber composite material layer 102, it can be fixed on the inner metal grid layer 101 by winding, bundling or weaving, and these structural forms should also fall within the protection scope of the present application.

[0059] In some specific embodiments, the fiber composite layer 102 can be formed by curing the fiber composite wound around the outer periphery of the inner metal grid layer 101. In this way, not only the overall structural strength of the fiber composite layer 102 itself can be further improved, but also the bonding strength between the inner metal grid layer 101 and the fiber composite layer 102 can be further improved, thereby further improving the overall strength of the fiber composite boom, so that the fiber composite boom has good safety and reliability and a long service life.

[0060] Among them, the winding angle of the fiber composite has a great influence on the strength and bending performance of the fiber composite boom. If the winding angle of the fiber composite is too large, the strength of the fiber composite boom is high, but it is easy to cause the bending performance of the fiber composite boom to deteriorate. If the winding angle of the fiber composite is reduced, the bending performance of the fiber composite boom is improved, but it is easy to cause the strength of the fiber composite boom to decrease.

[0061] Since the fiber composite layer 102 is the load-bearing part of the boom and bears the isotropic loads of the boom, in order to improve both the strength and bending performance of the fiber composite boom, the fiber composite layer 102 may include multiple winding layers with different winding angles, for example, 2, 3, 4 or other multiple winding layers.

[0062] Optionally, the plurality of winding layers may include at least a first angle fiber composite layer and a second angle fiber composite layer, and the winding angle of the first angle fiber composite layer is smaller than the winding angle of the second angle fiber composite layer. The winding angle of the first angle fiber composite layer is greater than 0° and less than or equal to 40°, and the winding angle of the second angle fiber composite layer is greater than 40° and less than or equal to 90°. Preferably, the winding angle of the first angle fiber composite layer is greater than 0° and less than or equal to 30°, and the winding angle of the second angle fiber composite layer is greater than 45° and less than or equal to 90°.

[0063] Optionally, the material of the fiber of the fiber composite layer 102 may include one or more of carbon fiber, glass fiber and aramid fiber. The material of the matrix of the fiber composite layer 102 may include one or more of epoxy resin, unsaturated resin and phenolic resin. The thickness of the fiber composite layer 102, the material, specification and model of the fiber and matrix may be set according to the actual application scenario and design requirements.

[0064] Furthermore, the inner metal grid layer 101 and the outer metal grid layer 103 may include metal grids 104, respectively, and the metal grids serve as wear-resistant layers to resist wear. Figure 2 As shown, since the metal grid 104 is a grid-like structure with good process flexibility, when the fiber composite boom is in actual working conditions, the flexible inner metal grid layer 101 and the fiber composite layer 102 are slightly deformed with extrusion, and cooperate with the deformation of the fiber composite layer 102, and are not easy to fall off from the fiber composite layer 102, which can further improve the bending performance of the fiber composite boom. Figure 3 As shown, since the metal grid includes a hollow hole structure, the fiber composite matrix 105 is partially filled into the hole structure in the metal grid during the curing process, so that the adhesion and bonding force between the inner metal grid layer 101 and the outer metal grid layer 103 and the fiber composite layer 102 can be greatly improved, thereby effectively improving the overall strength of the fiber composite boom, so that the fiber composite boom has good safety and reliability and a long service life.

[0065] Furthermore, the metal grid is woven from metal wires and includes a plurality of meshes. In order to ensure the process flexibility of the metal grid and to achieve close contact between the fiber composite layer 102 and the inner metal grid layer 101 and the outer metal grid layer 103, the area of ​​a single mesh of the inner metal grid layer 101 and / or the outer metal grid layer 103 may be greater than or equal to 0.2 mm 2 And less than or equal to 15mm2 Preferably, the area of ​​a single grid is greater than or equal to 1 mm 2 And less than or equal to 10mm 2 .

[0066] Optionally, in order to ensure the wear resistance and lightweight effect of the inner metal grid layer 101 and the outer metal grid layer 103, the material of the metal wire is one or more of wear-resistant high-strength steel, aluminum alloy and magnesium alloy. The cross-sectional diameter of the metal wire of the inner metal grid layer 101 and / or the outer metal grid layer 103 may be greater than or equal to 0.5 mm and less than or equal to 4 mm. Preferably, the cross-sectional diameter of the metal wire may be greater than or equal to 1 mm and less than or equal to 2 mm. The hardness of the metal wire of the inner metal grid layer 101 and / or the outer metal grid layer 103 may be greater than or equal to 35 HRC and less than or equal to 68 HRC. Preferably, the hardness of the metal wire may be greater than or equal to 45 HRC and less than or equal to 64 HRC.

[0067] Optionally, in order to take into account both the strength of the fiber composite boom and the service life of the wear-resistant layer, the embedding degree of the inner metal grid layer 101 in the fiber composite layer 102 may be greater than or equal to 25% and less than or equal to 75%, and the embedding degree of the outer metal grid layer 103 in the fiber composite layer 102 may be greater than or equal to 25% and less than or equal to 75%. Preferably, the embedding degree of the inner metal grid layer 101 in the fiber composite layer 102 may be greater than or equal to 30% and less than or equal to 70%, and the embedding degree of the outer metal grid layer 103 in the fiber composite layer 102 may be greater than or equal to 30% and less than or equal to 70%.

[0068] The embedding degree of the inner metal grid layer 101 is the ratio of the thickness of the inner metal grid layer 101 embedded in the fiber composite layer 102 to the thickness of the inner metal grid layer 101, and the embedding degree of the outer metal grid layer 103 is the ratio of the thickness of the outer metal grid layer 103 embedded in the fiber composite layer 102 to the thickness of the outer metal grid layer 103. For example, when the inner metal grid layer 101 is completely embedded in the fiber composite layer 102, the embedding degree is 1.

[0069] It can be seen that the fiber composite boom of the present application introduces a metal mesh structure as a wear-resistant layer on the contact surface with the slider, so that the boom has excellent wear resistance. In addition, the adhesion between the wear-resistant layer and the fiber composite layer of the boom is good, and no additional punching and fixing is required. By controlling the mesh size of the metal mesh, the diameter of a single metal wire, the hardness, the winding tension and the vacuum degree, the metal mesh wear-resistant layer and the fiber composite layer can be embedded in each other and tightly combined, which effectively improves the problem of poor interface bonding ability between metal and fiber composite. At the same time, the highly flexible metal mesh wear-resistant layer can follow the boom to undergo corresponding deformation when it is slightly bent, and will not peel off from the fiber composite layer. The overall structure of the boom is reasonable and the strength is high, which effectively improves the life and safety reliability of the telescopic boom.

[0070] The second aspect of the present application provides an engineering machine, which includes the above-mentioned fiber composite boom. Since the engineering machine includes the above-mentioned fiber composite boom, it also has all the technical effects brought by the fiber composite boom, so it will not be repeated.

[0071] The construction machinery may be a crane, such as a truck crane, a crawler crane or a boom tower crane, or may be other construction machinery such as a pump truck, an aerial work vehicle, a fire truck, a boom-type work robot, etc.

[0072] A third aspect of the present application provides a method for preparing a fiber composite boom, the method for preparing the fiber composite boom comprising:

[0073] Preparing a mandrel mold 200;

[0074] An inner metal grid is provided on the mandrel mold 200;

[0075] Winding the fiber composite material around the outer periphery of the inner metal grid along the circumference of the mandrel mold 200 to form a fiber winding structure;

[0076] An outer metal grid is arranged on the outer periphery of the fiber winding structure, and the inner metal grid, the fiber winding structure and the outer metal grid form an arm blank;

[0077] The boom blank is heated and cured to form a fiber composite boom. The peripheral wall of the fiber composite boom comprises an inner metal grid layer 101, a fiber composite layer 102 and an outer metal grid layer 103 in sequence.

[0078] Among them, the inner metal grid can be fixed on the core shaft mold 200 by bonding, bundling, clamping, etc., and the outer metal grid can be fixed on the fiber winding structure by bonding, bundling, clamping or vacuum bag pressing. After the outer metal grid is prepared, the arm blank is heated and cured, and the heating and curing method can be, for example, direct heating, microwave, infrared, etc. The peripheral wall of the fiber composite arm includes an inner metal grid, a fiber winding structure and an outer metal grid. The cured inner metal grid, fiber winding structure and outer metal grid correspond to the inner metal grid layer 101, the fiber composite layer 102 and the outer metal grid layer 103 respectively.

[0079] Specifically, Figure 4 As shown, the mandrel mold 200 may include a mandrel 201 and a winding mold 202, and the winding mold 202 is disposed on the outer peripheral wall of the mandrel 201. The winding mold 202 may be a high-strength and lightweight material, such as a high-hardness foam.

[0080] Alternatively, if Figure 5As shown, the inner metal grid is a metal grid, which can be physically fixed on the upper and lower surfaces of the mandrel mold 200. The metal grid can be woven from metal wires, the cross-sectional diameter of the metal wires is in the range of 1 to 2 mm, and the material is selected to be wear-resistant high-strength steel with a hardness in the range of 45 to 64 HRC. The mesh size of the metal wires in the process of weaving the mesh is controlled to be consistent, and the area of ​​a single mesh is 1 to 10 mm. 2 Range, the shape of the grid can be prism, triangle or hexagon, etc.

[0081] Further, the step of winding fibers on the outer side of the inner metal grid along the circumference of the mandrel mold 200 to form a fiber winding structure may specifically include:

[0082] The fiber composite material is successively wound at different winding angles on the outer side of the metal grid along the circumference of the mandrel mold 200 to form a fiber winding structure.

[0083] Among them, Figure 6 , Figure 7 and Figure 8 As shown, the fiber winding structure includes a first angle fiber winding structure 1021 and a second angle fiber winding structure 1022 having different winding angles, and the winding angle of the first angle fiber winding structure 1021 is smaller than the winding angle of the second angle fiber winding structure 1022. The winding angle of the first angle fiber winding structure 1021 is greater than 0° and less than or equal to 40°, and the winding angle of the second angle fiber winding structure 1022 is greater than 40° and less than or equal to 90°. Preferably, the winding angle of the first angle fiber winding structure 1021 is greater than 0° and less than or equal to 30°, and the winding angle of the second angle fiber winding structure 1022 is greater than 45° and less than or equal to 90°.

[0084] Optionally, when the fiber composite is wound on the outside of the inner metal grid to form a fiber winding structure, the winding can be divided into multiple cycles, each cycle can include a large-angle fiber composite winding process and a small-angle fiber composite winding process, and the specific number of cycles and the order of cycles can be determined according to actual applications and design requirements.

[0085] Furthermore, fibers are wound around the outer side of the inner metal grid along the circumference of the mandrel mold 200 to form a fiber winding structure, including:

[0086] The winding tension of the fiber winding structure is determined according to the set embedding degree of the inner metal grid layer 101 in the fiber composite layer 102, the area of ​​a single grid of the inner metal grid, and the cross-sectional diameter and hardness of the metal wires of the inner metal grid.

[0087] The embedding degree of the inner metal grid layer 101 is the ratio between the thickness of the inner metal grid layer 101 embedded in the fiber composite layer 102 and the thickness of the inner metal grid layer 101. The embedding degree of the inner metal grid layer 101 in the fiber composite layer 102 may be greater than or equal to 25% and less than or equal to 75%. Preferably, the embedding degree of the inner metal grid layer 101 in the fiber composite layer 102 may be greater than or equal to 30% and less than or equal to 70%.

[0088] In addition, the embedding degree E1 of the inner metal grid layer 101 is related to the winding tension F of the fiber winding structure, the cross-sectional diameter D1 of the metal wire of the inner metal grid, the hardness H1 of the metal wire of the inner metal grid, and the single mesh area A1 of the inner metal grid, that is, E1=f1(F,D1,H1,A1). The function f1 needs to be determined through experimental research and numerical simulation.

[0089] Among them, the embedding degree E1 of the inner metal grid layer 101 is positively correlated with the winding tension F, that is, the greater the winding tension F of the fiber winding structure, the greater the embedding degree E1 of the inner metal grid layer 101. The embedding degree E1 of the inner metal grid layer 101 is negatively correlated with the power of the cross-sectional diameter D1 of the metal wire of the inner metal grid, that is, the larger the cross-sectional diameter D1 of the metal wire of the inner metal grid, the fewer the number of metal wires per unit area, and the shallower the inner metal grid layer 101 is embedded. The embedding degree E1 of the inner metal grid layer 101 is positively correlated with the power of the hardness H1 of the metal wire of the inner metal grid, that is, the higher the hardness H1 of the metal wire of the inner metal grid, the deeper the inner metal grid layer 101 can be embedded. The embedding degree E1 of the inner metal grid layer 101 is negatively correlated with the power of the single grid area A1 of the inner metal grid, that is, the larger the single grid area A1 of the inner metal grid, the fewer the number of metal wires per unit area, and the shallower the inner metal grid layer 101 is embedded.

[0090] Specifically, the relationship between the embedding degree E1 of the inner metal grid layer 101 and the winding tension F of the fiber winding structure, the cross-sectional diameter D1 of the metal wire of the inner metal grid, the hardness H1 of the metal wire of the inner metal grid, and the single mesh area A1 of the inner metal grid is E1=a1+b1F+b2D1 n +b3H1 m +b4A1 p .

[0091] Among them, a1, b1, b2, b3 and b4 are constants, n, m and p are undetermined powers, which can be fitted by experimental data. The winding tension of the fiber winding structure is in the range of 8 to 12 N / bundle, the cross-sectional diameter D1 of the metal wire of the inner metal grid is in mm, the hardness H1 of the metal wire of the inner metal grid is in HRC, and the single mesh area A1 of the inner metal grid is in mm 2 .

[0092] Under normal circumstances, the designed telescopic arm needs to work under a pressure of 10MPa for 10 years, at which time the friction times of the inner and outer surfaces are both 9000 times. Therefore, the friction test platform sets the parameter pressure to 10MPa, and the nylon slider is the friction pair. The test screening is carried out according to the safety factor greater than 0.1. The test results are illustrated below.

[0093] For example, when the embedding degree E1 of the inner metal grid layer 101 is controlled to be 30%, A1 can be selected to be 10 mm. 2 , D1 is 2mm, H1 is 45HRC wear-resistant high-strength steel woven into the inner metal grid, and the fiber composite and the inner metal grid are embedded in each other with a winding tension of 8N / bundle. At this time, when a nylon slider is used as a friction pair for friction, the metal mesh does not peel off after 10,000 friction times under 10MPa.

[0094] When the embedding degree E1 of the inner metal grid layer 101 is controlled to be 40%, A1 can be selected to be 8 mm. 2 , D1 is 2mm, H1 is 50HRC wear-resistant high-strength steel woven into the inner metal grid, and the fiber composite and the inner metal grid are embedded in each other with a winding tension of 9N / bundle. At this time, the metal mesh does not peel off after the friction times reach 10,000 times under 10MPa.

[0095] When the embedding degree E1 of the inner metal grid layer 101 is controlled to be 50%, A1 can be selected to be 6 mm. 2 , D1 is 2mm, H1 is 55HRC wear-resistant high-strength steel woven into the inner metal grid, and the fiber composite and the inner metal grid are embedded in each other with a winding tension of 10N / bundle. At this time, the metal mesh does not peel off after the friction number reaches 10,000 times under 10MPa.

[0096] When the embedding degree E1 of the inner metal grid layer 101 is controlled to be 60%, A1 can be selected to be 6 mm. 2 , D1 is 2mm, H1 is 60HRC wear-resistant high-strength steel woven into the inner metal grid, and the fiber composite and the inner metal grid are embedded in each other with a winding tension of 10N / bundle. At this time, the metal mesh does not peel off after the friction number reaches 10,000 times under 10MPa.

[0097] When the embedding degree E1 of the inner metal grid layer 101 is controlled to be 70%, A1 can be selected to be 1 mm 2 , D1 is 2mm, H1 is 64HRC wear-resistant high-strength steel woven into the inner metal grid, and the fiber composite and the inner metal grid are embedded in each other with a winding tension of 12N / bundle. At this time, the metal mesh does not peel off after the friction number reaches 10,000 times under 10MPa.

[0098] When the embedding degree E1 of the inner metal grid layer 101 is controlled to be 20%, A1 can be selected to be 15 mm. 2 , D1 is 2mm, H1 is 45HRC wear-resistant high-strength steel woven into the inner metal grid, and the fiber composite and the inner metal grid are embedded in each other with a winding tension of 6N / bundle. At this time, the friction times reach 5000 times under 10MPa, and the metal mesh is peeled off from the fiber layer, which cannot effectively protect the boom body.

[0099] When the embedding degree E1 of the inner metal grid layer 101 is controlled to be 80%, A1 can be selected to be 1 mm 2 , D1 is 2mm, H1 is 45HRC wear-resistant high-strength steel woven into the inner metal grid, and the fiber composite and the inner metal grid are embedded with each other using a winding tension of 15N / bundle. At this time, the metal mesh will not peel off from the fiber layer when the friction number reaches 10,000 times under 10MPa. However, due to the pressure, the nylon friction pair is completely in contact with the fiber layer, and the metal mesh cannot play an isolation effect and cannot effectively protect the boom body. After the fiber winding structure is prepared, Figure 8 shown.

[0100] Alternatively, if Fig. 9 As shown, after the fiber winding structure is prepared, an outer metal grid is fixed on the outer surface of the fiber winding structure. The specific parameter range of the outer metal grid can be consistent with that of the inner metal grid, and the parameters can be adjusted according to needs.

[0101] Optionally, the step of providing an outer metal grid on the outer side of the fiber winding structure may specifically include:

[0102] An outer metal grid is fixed to the outer periphery of the fiber winding structure;

[0103] A vacuum bag is sleeved on the outer metal grid, and the vacuum bag is evacuated to a set pressure to embed the outer metal grid on the outer periphery of the fiber winding structure.

[0104] Specifically, the outer metal grid can be bonded to the outer surface of the fiber winding structure, and a vacuum bag can be set and vacuumed. By controlling the pressure in the vacuum bag, the embedding degree of the outer metal grid can be controlled to be in the range of 30-70%. The embedding degree E2 of the outer metal grid layer 103 in the fiber composite layer 102 is related to the set pressure P during vacuuming, the single grid area A2 of the outer metal grid, the cross-sectional diameter D2 of the metal wire of the outer metal grid, and the hardness H2 of the metal wire of the outer metal grid, that is, E2=f2(P, D2, H2, A2). The function f2 needs to be determined through experimental research and numerical simulation.

[0105] The embedding degree E2 of the outer metal grid layer 103 is positively correlated with the set pressure P during vacuuming, that is, the greater the set pressure P during vacuuming, the greater the embedding degree E2 of the outer metal grid layer 103. The embedding degree E2 of the outer metal grid layer 103 is negatively correlated with the power of the cross-sectional diameter D2 of the metal wire of the outer metal grid, that is, the larger the cross-sectional diameter D2 of the metal wire of the outer metal grid, the fewer the number of metal wires per unit area, and the shallower the outer metal grid layer 103 may be embedded. The embedding degree E2 of the outer metal grid layer 103 is positively correlated with the power of the hardness H2 of the metal wire of the outer metal grid, that is, the higher the hardness H2 of the metal wire of the outer metal grid, the deeper the outer metal grid layer 103 can be embedded. The embedding degree E2 of the outer metal grid layer 103 is negatively correlated with the power of a single grid area A2 of the outer metal grid, that is, the larger the single grid area A2 of the outer metal grid is, the fewer the number of metal wires per unit area is, and the outer metal grid layer 103 may be embedded more shallowly.

[0106] Optionally, the relationship between the embedding degree E2 of the outer metal grid layer 103 and the set pressure P during vacuuming, the single grid area A2 of the outer metal grid, the cross-sectional diameter D2 of the metal wire of the outer metal grid, and the hardness H2 of the metal wire of the outer metal grid is E2=a2+c1P+c2D2 r +c3H2 s +c4A2 t .

[0107] Among them, a2, c1, c2, c3 and c4 are constants, r, s, t are undetermined powers, which can be fitted by experimental data. The set pressure P during vacuuming is in the range of 0.04 to 0.1 MPa, the cross-sectional diameter D2 of the metal wire of the outer metal grid is in mm, the hardness H2 of the metal wire of the outer metal grid is in HRC, and the single grid area A2 of the outer metal grid is in mm 2 .

[0108] Similarly, under normal circumstances, the designed telescopic arm needs to work under a pressure of 10MPa for 10 years, at which time the number of frictions between the inner and outer surfaces reaches 9000 times. Therefore, the friction test platform sets the parameter pressure to 10MPa, and the nylon slider is the friction pair. The test screening is carried out according to the safety factor greater than 0.1. The test results are illustrated below.

[0109] For example, when the embedding degree E2 of the outer metal grid layer 103 is controlled to be 30%, A2 can be selected to be 10 mm. 2 The outer metal grid is woven with wear-resistant high-strength steel of D2 of 2mm and H2 of 45HRC, and the outer metal grid and the fiber composite are embedded in each other by vacuum bag pressing with a set pressure P of 0.04MPa. When nylon sliders are used as friction pairs for friction, the metal grid does not peel off after 10,000 friction times under 10MPa.

[0110] When the embedding degree E2 of the outer metal grid layer 103 is controlled to be 40%, A2 can be selected to be 8 mm. 2 The outer metal grid is woven from wear-resistant high-strength steel with D2 of 2mm and H2 of 50HRC, and the outer metal grid and the fiber composite are embedded in each other by vacuum bag pressing with a set pressure P of 0.06MPa. At this time, the metal grid does not peel off after the friction times reach 10,000 times under 10MPa.

[0111] When the embedding degree E2 of the outer metal grid layer 103 is controlled to be 50%, A2 can be selected to be 6 mm. 2 The outer metal grid is woven from wear-resistant high-strength steel with D2 of 2mm and H2 of 50HRC, and the outer metal grid and the fiber composite are embedded in each other by vacuum bag pressing with a set pressure P of 0.06MPa. At this time, the metal grid does not peel off after the friction times reach 10,000 times under 10MPa.

[0112] When the embedding degree E2 of the outer metal grid layer 103 is controlled to be 60%, A2 can be selected to be 6 mm. 2 The outer metal grid is woven with wear-resistant high-strength steel of D2 of 2mm and H2 of 55HRC, and the outer metal grid and the fiber composite are embedded in each other by vacuum bag pressing with a set pressure P of 0.08MPa. At this time, the metal grid does not peel off after 10,000 friction times under 10MPa.

[0113] When the embedding degree E2 of the outer metal grid layer 103 is controlled to be 70%, A2 can be selected to be 1 mm 2 The outer metal grid is woven from wear-resistant high-strength steel with D2 of 2mm and H2 of 64HRC, and the outer metal grid and the fiber composite are embedded in each other by vacuum bag pressing with a set pressure P of 0.1MPa. At this time, the metal grid does not peel off after 10,000 friction times under 10MPa.

[0114] When the embedding degree E2 of the outer metal grid layer 103 is controlled to be 20%, A2 can be selected to be 15 mm. 2 The outer metal grid is woven with wear-resistant high-strength steel of D2 of 2mm and H2 of 45HRC, and the outer metal grid and the fiber composite are embedded in each other by vacuum bag pressing with a set pressure P of 0.02MPa. At this time, the friction times reach 5000 times under 10MPa, and the metal mesh is peeled off from the fiber layer, which cannot effectively protect the boom body.

[0115] When the embedding degree E2 of the outer metal grid layer 103 is controlled to be 80%, A2 can be selected to be 1 mm 2The outer metal grid is woven with wear-resistant high-strength steel of D2 of 2mm and H2 of 45HRC, and the outer metal grid and the fiber composite are embedded in each other by vacuum bag pressing with a set pressure P of 0.13MPa. At this time, the metal mesh will not peel off from the fiber layer when the friction number reaches 10,000 times under 10MPa. However, due to the pressure, the nylon friction pair is in full contact with the fiber layer, and the metal mesh cannot play an isolation effect and cannot effectively protect the boom body.

[0116] Furthermore, after solidification, the excess material at both ends of the workpiece is cut off in turn, the tooling is removed, the mandrel 201 is pulled out, and the internal foam is cleaned to obtain a fiber composite telescopic arm blank with a wear-resistant layer on the surface. Then, the inner metal grid layer 101 and the outer metal grid layer 103 can be finely processed to remove impurities and residual glue on the surface to ensure that the surface roughness, coaxiality, etc. meet the design requirements. At this point, the fiber composite arm with a metal grid wear-resistant layer is completed. Figure 1 shown.

[0117] In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0118] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0119] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0120] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A fiber composite boom, characterized in that: The peripheral wall of the fiber composite arm frame includes: A fiber composite material layer (102), formed by curing the fiber composite material; An inner metal grid layer (101) embedded in the inner periphery of the fiber composite material layer (102); The outer metal grid layer (103) is embedded in the outer periphery of the fiber composite material layer (102).

2. The fiber composite boom according to claim 1, characterized in that: The fiber composite material layer (102) is formed by solidifying the fiber composite material wound around the outer periphery of the inner metal grid layer (101).

3. The fiber composite boom according to claim 2, characterized in that: The fiber composite layer (102) comprises a first angle fiber composite layer and a second angle fiber composite layer having different winding angles, wherein the winding angle of the first angle fiber composite layer is greater than 0° and less than or equal to 30°, and the winding angle of the second angle fiber composite layer is greater than 45° and less than or equal to 90°; and / or, The material of the fibers of the fiber composite layer (102) includes one or more of carbon fiber, glass fiber and aramid fiber; and / or, The material of the matrix of the fiber composite layer (102) includes one or more of epoxy resin, unsaturated resin and phenolic resin.

4. The fiber composite boom according to claim 1, characterized in that: The inner metal grid layer (101) and the outer metal grid layer (103) respectively comprise metal grids, and the matrix of the fiber composite material is partially filled into the metal grids during the curing process.

5. The fiber composite boom according to claim 4, characterized in that: The metal grid is woven from metal wires, wherein: The cross-sectional diameter of the metal wire is greater than or equal to 1 mm and less than or equal to 2 mm; and / or, The material of the metal wire is one or more of wear-resistant high-strength steel, aluminum alloy and magnesium alloy; and / or, The hardness of the metal wire is greater than or equal to 45HRC and less than or equal to 64HRC; and / or, The metal grid includes a plurality of grids, and the area of ​​a single grid is greater than or equal to 1 mm 2 And less than or equal to 10mm 2 .

6. The fiber composite boom according to claim 4, characterized in that: The embedding degree of the inner metal grid layer (101) in the fiber composite layer (102) is greater than or equal to 30% and less than or equal to 70%, and the embedding degree of the outer metal grid layer (103) in the fiber composite layer (102) is greater than or equal to 30% and less than or equal to 70%. The embedding degree of the inner metal grid layer (101) is the ratio between the thickness of the inner metal grid layer (101) embedded in the fiber composite layer (102) and the thickness of the inner metal grid layer (101), and the embedding degree of the outer metal grid layer (103) is the ratio between the thickness of the outer metal grid layer (103) embedded in the fiber composite layer (102) and the thickness of the outer metal grid layer (103).

7. An engineering machine, characterized in that: A fiber composite boom comprising the fiber composite boom according to any one of claims 1 to 6.

8. A method for preparing a fiber composite boom, characterized in that: include: Preparing a mandrel mold (200); An inner metal grid is arranged on the mandrel mold (200); Winding a fiber composite material on the outer periphery of the inner metal grid along the circumference of the mandrel mold (200) to form a fiber winding structure; An outer metal grid is arranged at the outer periphery of the fiber winding structure, and the inner metal grid, the fiber winding structure and the outer metal grid form an arm blank; The arm blank is heated and cured to form a fiber composite arm, wherein the peripheral wall of the fiber composite arm comprises an inner metal grid layer (101), a fiber composite layer (102) and an outer metal grid layer (103) in sequence.

9. The method for preparing the fiber composite boom according to claim 8, characterized in that: The fiber is wound around the outer side of the inner metal grid along the circumference of the mandrel mold (200) to form a fiber winding structure, comprising: The winding tension of the fiber winding structure is determined according to the set embedding degree of the inner metal grid layer (101) in the fiber composite layer (102), the area of ​​a single grid of the inner metal grid, and the cross-sectional diameter and hardness of the metal wires of the inner metal grid.

10. The method for preparing the fiber composite boom according to claim 8, characterized in that: The fiber is wound around the outer side of the inner metal grid along the circumference of the mandrel mold (200) to form a fiber winding structure, comprising: The fiber composite is successively wound at different winding angles on the outer side of the metal grid along the circumference of the mandrel mold (200) to form a fiber winding structure, wherein the fiber winding structure comprises a first angle fiber winding structure (1021) and a second angle fiber winding structure (1022) having different winding angles.

11. The method for preparing the fiber composite boom according to claim 8, characterized in that: The outer metal grid is arranged on the outer side of the fiber winding structure, comprising: fixing an outer metal grid on the outer periphery of the fiber winding structure; A vacuum bag is placed on the outer metal grid, and the vacuum bag is evacuated to a set pressure to embed the outer metal grid into the outer periphery of the fiber winding structure. The set pressure is determined according to the set embedding degree of the outer metal grid layer (103) in the fiber composite layer (102), the area of ​​a single grid of the outer metal grid, and the cross-sectional diameter and hardness of the metal wires of the outer metal grid.

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