Arm section, manufacturing method thereof, arm support and engineering machinery

Abstract

The invention provides an arm section, a manufacturing method thereof, an arm support and engineering machinery. The manufacturing method of the arm section comprises the steps that a plurality of structural units are prepared with an inner mold as a core mold, and the step of preparing each structural unit comprises the substeps that a plurality of spiral winding bodies are prepared, and first fibers impregnated with a base material are spirally wound layer by layer; preparing an annular winding body on the outer side of the plurality of spiral winding bodies, wherein the annular winding body comprises winding first fibers impregnated with a base material layer by layer approximately in the circumferential direction of the inner mold; and curing the matrix material; in the direction from the inner side of the arm section to the outer side of the arm section, the winding tension of the first fiber in each spiral winding body is sequentially reduced, and the winding tension of the first fiber in each spiral winding body is reduced layer by layer; the winding tension of the first fibers in the annular winding body is reduced layer by layer; the included angle between the first fiber in each spiral winding body and the axis of the arm section changes layer by layer. According to the scheme, the bearing capacity of the arm section can be improved.

Description

Technical Field

[0001] The present disclosure relates to the field of engineering machinery, and in particular to a boom section and a manufacturing method thereof, a boom and engineering machinery. Background Art

[0002] Insulated boom aerial work platforms, also known as insulated bucket booms, are essential equipment for national distribution network construction, equipment troubleshooting, and non-stop distribution line operations. High-altitude, high-voltage live work has grown from a few meters to 25 meters or even higher. Environmental factors such as rain and dew can degrade the insulation properties of the insulated boom.

[0003] Moreover, in order to ensure the working stability of the boom, the boom is required to have very high strength, rigidity and deformation resistance, which brings a double test to the insulation performance and bearing strength of the boom.

[0004] However, based on the current wet winding preparation method of the insulating boom, the uneven distribution of the resin material in the boom section and the uneven initial stress of different fiber layers will affect the overall mechanical properties of the boom and reduce the bearing capacity of the boom. Summary of the Invention

[0005] The purpose of the present disclosure is to provide a boom section and a manufacturing method thereof, a boom and an engineering machine, so as to improve the carrying capacity of the boom section.

[0006] A first aspect of the present disclosure provides a method for manufacturing an arm segment, wherein the arm segment includes an arm segment body. The method comprises: using an inner mold as a core mold to prepare a plurality of structural units distributed from the inner side to the outer side of the arm segment to form the arm segment body, wherein preparing each structural unit includes:

[0007] preparing a plurality of spirally wound bodies, including spirally winding a first fiber impregnated with a matrix material layer by layer;

[0008] preparing a hoop-wound body outside the plurality of spiral-wound bodies, comprising winding first fibers impregnated with a matrix material layer by layer substantially along a circumferential direction of the inner mold; and

[0009] solidifying the matrix material;

[0010] Wherein, in each of the structural units, along the direction from the inner side to the outer side of the arm segment,

[0011] The winding tension of the first fiber in the multiple layers of the first fiber in each of the spirally wound bodies decreases layer by layer, and the winding tension of the first fiber in each of the spirally wound bodies decreases sequentially;

[0012] The winding tension of the first fibers in the multiple layers of the first fibers in the hoop-wound body decreases layer by layer;

[0013] In each of the multiple layers of the first fibers in the spirally wound body, the angle between the first fibers and the axis of the arm segment changes layer by layer.

[0014] In the manufacturing method of the arm segment in some embodiments, the angle between the first fiber and the axis of the arm segment in the multiple layers of the first fiber of each spirally wound body decreases layer by layer along the direction from the inside to the outside of the arm segment.

[0015] In some embodiments of the manufacturing method of the arm segment, preparing each of the spirally wound bodies includes spirally winding three layers of the first fiber, and the angles between each layer of the first fiber and the axis of the arm segment are z1, z2, and z3, respectively, wherein z1=55°~65°, z2=45°~55°, and z3=30°~45°.

[0016] In the manufacturing method of the arm segment in some embodiments, preparing the plurality of spirally wound bodies includes:

[0017] The winding tension of the innermost layer of the first fibers in the plurality of spirally wound bodies is 30N to 60N; and / or

[0018] Along the direction from the inside to the outside of the arm segment, the winding tension of the first fibers in the (i+1)th layer is reduced by 0.2% to 5% compared with the winding tension of the first fibers in the i-th layer, where i is a positive integer.

[0019] In the manufacturing method of the arm segment in some embodiments, preparing the hoop wound body includes:

[0020] The winding tension of the innermost layer of the first fiber in the hoop-wound body is 40 N to 60 N; and / or

[0021] Along the direction from the inside to the outside of the arm segment, the winding tension of the first fibers in the (i+1)th layer is reduced by 0.2% to 5% compared with the winding tension of the first fibers in the i-th layer, where i is a positive integer.

[0022] In some embodiments of the method for manufacturing an arm segment, the method includes: when preparing the circumferential winding body, the angle between the first fiber and the axis of the arm segment is 80°~90°.

[0023] In the arm segment manufacturing method of some embodiments, before solidifying the base material, preparing each of the structural units includes:

[0024] Providing an outer mold, wherein the outer mold, when closed, is capable of forming an inner cavity adapted to a preset size of an outer contour of one of the structural units located on the outermost side;

[0025] The outer mold is gradually closed from the outside of the structural unit to apply pressure to the outer contour of the structural unit, so that the size of the outer contour of the structural unit located at the outermost side reaches a preset size.

[0026] In the manufacturing method of the arm section of some embodiments, when preparing the structural unit, the curing temperature of the base material is 70° C. to 130° C., and the curing time is 0.5 h to 2 h.

[0027] In a method for manufacturing an arm section in some embodiments, the arm section includes a wear-resistant layer disposed on the exterior of the arm section body, and the manufacturing method includes:

[0028] Winding the first fiber and the wear-resistant fiber mixedly around the arm section body to form a composite fiber layer;

[0029] Providing an outer mold, wherein the outer mold has an inner cavity adapted to a preset size of an outer contour of the wear-resistant layer, and placing the arm section body formed with the composite fiber layer in the inner cavity of the outer mold;

[0030] The inner cavity of the outer mold is filled with a matrix material, and the matrix material is solidified.

[0031] In the manufacturing method of the arm section of some embodiments, the first fiber includes glass fiber, and / or the wear-resistant fiber includes one or more of aramid fiber, basalt fiber and alumina fiber.

[0032] In the manufacturing method of the arm section in some embodiments, the mass ratio of the glass fiber to the wear-resistant fiber in the wear-resistant layer is 2-10:1.

[0033] In the manufacturing method of the arm section of some embodiments, when preparing the wear-resistant layer, the curing temperature of the base material is 70° C. to 130° C., and the curing time is 1 hour to 2 hours.

[0034] A second aspect of the present disclosure provides an arm section manufactured by the arm section manufacturing method according to the first aspect of the present disclosure.

[0035] A third aspect of the present disclosure provides a boom, comprising the boom section according to the second aspect of the present disclosure.

[0036] A fourth aspect of the present disclosure is an engineering machine, comprising the boom section according to the second aspect of the present disclosure.

[0037] Based on the manufacturing method of the arm segment provided by the present disclosure, when preparing the arm segment main body, it is solidified and formed in batches in the form of multiple structural units in the order from the inside to the outside of the arm segment. Wherein, when preparing each structural unit, a combination of spiral winding and circumferential winding of the first fiber is adopted. In each structural unit, the winding tension of each layer of the first fiber in the multiple spirally wound bodies decreases layer by layer from the inside to the outside, and the winding tension of each layer of the first fiber in the circumferentially wound body decreases layer by layer from the inside to the outside. The angle between the axis of the arm segment of each layer of the first fiber in each spirally wound body changes layer by layer from the inside to the outside, and the spiral angle of each layer of the first fiber is different when it is wound. In addition, the first fibers in the circumferentially wound body can restrain the first fibers in the spirally wound body, and compact the first fibers in the spirally wound body.

[0038] Compared with the winding method in which the winding tension of the first fibers in each layer is constant and the angle between the fibers and the axis of the arm section is constant during winding, this fiber winding method in which the winding tension and winding angle change layer by layer can reduce the radial pressure of the outer fibers on the inner fibers, keep the initial stress of different fiber layers in the arm section the same, reduce the risk of relaxation of the inner fibers due to radial compression deformation, and suppress the problems of uneven distribution of the matrix material in the axial direction of the arm section and uneven shape after molding by changing the fiber direction layer by layer in the spiral winding body and combining spiral winding and circumferential winding.

[0039] Therefore, through this fiber winding method, the strength of the boom section can be improved, the stress concentration problem of the fibers at both ends of the boom section can be reduced, the stiffness and bending resistance of the boom can be improved, and thus the ability of the boom section to withstand complex loads can be improved.

[0040] Furthermore, the matrix material impregnated with the first fibers in the plurality of structural units is cured in stages, which can also reduce deformation of the arm section after curing and lower the risk of fiber cutting and mechanical property degradation due to processing of the outer surface of the arm section.

[0041] It can be seen that the manufacturing method of the arm section provided in the present disclosure can improve the load-bearing capacity of the arm section, and by improving the load-bearing capacity of the arm section, the load-bearing capacity of the boom can be improved.

[0042] The arm section provided by the present disclosure has the advantages of the arm section manufacturing method provided by the present disclosure.

[0043] The boom provided by the present disclosure has the advantages of the arm section provided by the present disclosure.

[0044] The engineering machinery provided by the present disclosure has the advantages of the boom provided by the present disclosure.

[0045] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of this application. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation of the present disclosure. In the drawings:

[0047] Figure 1 Schematic diagram of the structure of arm sections of some embodiments of the present disclosure.

[0048] Figure 2 for Figure 1 Schematic diagram of the cross-section of the arm section shown.

[0049] Figure 3 for Figure 1 Schematic diagram of the structure of the longitudinal section of the arm section shown.

[0050] In the accompanying drawings, the reference numerals represent:

[0051] 1. Boom section; 11. Boom section body; 12. Wear-resistant layer;

[0052] 2. Inner mold;

[0053] 3. External mold. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0055] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, these techniques, methods and equipment should be considered as part of the specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary, rather than as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0056] In the description of the present disclosure, it should be understood that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of the present disclosure.

[0057] In the description of the present disclosure, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present disclosure and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present disclosure; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0058] Some embodiments of the present disclosure provide a method for manufacturing an arm segment. Figures 1 to 3 The arm section 1 includes an arm section body 11. The manufacturing method includes: using the inner mold 2 as a core mold to prepare a plurality of structural units distributed from the inner side to the outer side of the arm section 1 to form the arm section body 11.

[0059] The preparation of each structural unit includes: preparing a plurality of spiral winding bodies, comprising spirally winding a first fiber impregnated with a matrix material layer by layer; preparing a hoop winding body on the outside of the plurality of spiral winding bodies, comprising winding the first fiber impregnated with a matrix material layer by layer roughly along the circumference of the inner mold 2; and solidifying the matrix material.

[0060] Among them, in each structural unit, along the direction from the inside to the outside of the arm segment 1, the winding tension of the first fibers in the multiple layers of first fibers of each spiral winding body decreases layer by layer, and the winding tension of the first fibers in each spiral winding body decreases in turn; the winding tension of the first fibers in the multiple layers of first fibers of the circumferential winding body decreases layer by layer; the angle between the first fibers in the multiple layers of first fibers of each spiral winding body and the axis of the arm segment 1 changes layer by layer.

[0061] Optionally, the matrix material into which the first fiber is impregnated comprises resin. Optionally, the matrix material further comprises a curing agent and an accelerator, and when preparing the matrix material, the resin, the curing agent and the accelerator are mixed in a certain proportion.

[0062] The total thickness of the multiple spirally wound bodies and the thickness of the circumferentially wound body can be determined based on the design dimensions of the arm segment. Optionally, the total thickness of the multiple spirally wound bodies is 1 mm to 8 mm. Optionally, the thickness of the circumferentially wound body is 1 mm to 3 mm.

[0063] Optionally, when preparing a spirally wound body, the winding speed of the first fiber is 15 m / min to 25 m / min, for example, 15 m / min, 20 m / min, or 25 m / min. Optionally, when preparing a hoop-wound body, the winding speed of the first fiber is 15 m / min to 25 m / min, for example, 15 m / min, 20 m / min, or 25 m / min.

[0064] When preparing the circumferentially wound body, the word "approximately" is used to express the winding direction of the first fiber in order to make it clear that the winding direction of the first fiber is not strictly limited to the circumference of the inner mold 2. The case where the winding direction of the first fiber deviates slightly from the circumference of the inner mold 2, for example, the case where the angle α between the winding direction of the first fiber and the axis of the inner mold 2 is 80°≤α<90°, that is, the case where the angle between the winding direction of the first fiber and the axis of the arm section 1 is between 80° and 90°, should also be understood to be included in the scope of protection of the present invention.

[0065] Based on the manufacturing method of the arm segment provided by the embodiment of the present disclosure, when preparing the arm segment main body 11, it is solidified and formed in batches in the form of multiple structural units in the order from the inside to the outside of the arm segment 1. Among them, when preparing each structural unit, a combination of spiral winding and circumferential winding of the first fiber is adopted. In each structural unit, the winding tension of each layer of the first fiber in the multiple spiral winding bodies decreases layer by layer from the inside to the outside, and the winding tension of each layer of the first fiber in the circumferential winding body decreases layer by layer from the inside to the outside. The angle of the axis of the arm segment 1 of each layer of the first fiber in each spiral winding body changes layer by layer from the inside to the outside, and the spiral angle of each layer of the first fiber is different when it is wound. In addition, the first fibers in the circumferential winding body can restrain the first fibers in the spiral winding body, and compact the first fibers in the spiral winding body.

[0066] Compared with the winding method in which the winding tension of the first fibers of each layer is constant and the angle between the fibers and the axis of the arm section 1 is constant during winding, this fiber winding method in which the winding tension and winding angle change layer by layer can reduce the radial pressure of the outer fibers on the inner fibers, so that the initial stress of different fiber layers in the arm section 1 remains the same, and the risk of relaxation of the inner fibers due to radial compression deformation is reduced. In addition, the problem of uneven distribution of the matrix material in the axial direction of the arm section 1 and uneven shape after molding can be suppressed by changing the fiber direction layer by layer in the spiral winding body and combining spiral winding and circumferential winding.

[0067] Therefore, through this fiber winding method, the strength of the arm section 1 can be improved, the stress concentration problem of the fibers at both ends of the arm section can be reduced, the stiffness and bending resistance of the boom can be improved, and the ability of the arm section to withstand complex loads can be improved.

[0068] Furthermore, the matrix material impregnated with the first fibers in the plurality of structural units is cured in stages, which can also reduce deformation of the arm section 1 after curing and lower the risk of fiber cutting and mechanical property degradation due to processing of the outer surface of the arm section 1.

[0069] It can be seen that the manufacturing method of the arm section provided by the embodiment of the present disclosure can improve the load-bearing capacity of the arm section, and by improving the load-bearing capacity of the arm section, the load-bearing capacity of the boom can be improved.

[0070] In the arm segment manufacturing method of some embodiments, along the direction from the inside to the outside of the arm segment 1 , the angle between the first fibers in the multiple layers of first fibers of each spirally wound body and the axis of the arm segment 1 decreases layer by layer.

[0071] Optionally, each spirally wound body includes n layers of first fibers, where n is a positive integer greater than 1, and along the direction from the inside to the outside of the arm segment 1, the first fibers of the i-th layer of two adjacent spirally wound bodies have the same angle with the axis of the arm segment 1, where i is a positive integer.

[0072] In the manufacturing method of the arm segment in some embodiments, preparing each spirally wound body includes spirally winding three layers of first fibers, and the angles between each layer of first fibers and the axis of the arm segment 1 are z1, z2, and z3, respectively, wherein z1=55°~65°, z2=45°~55°, and z3=30°~45°.

[0073] According to the load-bearing requirements and stress distribution characteristics of the arm segment 1 , each helically wound body may include more or fewer layers of first fibers having different angles with the axis of the arm segment 1 .

[0074] In some embodiments, the method for manufacturing an arm section includes:

[0075] The winding tension of the innermost layer of the first fiber in the plurality of spirally wound bodies is 30N to 60N; and / or

[0076] Along the direction from the inside to the outside of the arm segment 1, the winding tension of the first fiber of the i+1th layer is reduced by 0.2% to 5% compared with the winding tension of the first fiber of the i-th layer, where i is a positive integer.

[0077] In this embodiment, the winding tension used for the innermost layer of first fibers in the plurality of spirally wound bodies is the initial value of the winding tension of the first fibers when preparing the plurality of spirally wound bodies. This initial value can be the same or different when preparing each structural unit, for example, 30 N, 40 N, 45 N, 50 N, or 60 N. The reduction in the winding tension of the first fibers between two adjacent layers of first fibers can be, for example, 0.2%, 0.5%, 1%, 1.5%, 2%, 3%, 4%, or 5%.

[0078] In some embodiments, the method for manufacturing an arm section includes:

[0079] The winding tension of the innermost layer of the first fiber in the hoop-wound body is 40N to 60N; and / or

[0080] Along the direction from the inside to the outside of the arm segment 1, the winding tension of the first fiber of the i+1th layer is reduced by 0.2% to 5% compared with the winding tension of the first fiber of the i-th layer, where i is a positive integer.

[0081] In this embodiment, the winding tension used for the innermost layer of first fibers in the hoop-wound body is the initial value of the winding tension of the first fibers during preparation of the hoop-wound body. This initial value can be, for example, 40 N, 45 N, 50 N, or 60 N. The reduction in the winding tension of the first fibers between two adjacent layers of first fibers can be, for example, 0.2%, 0.5%, 1%, 1.5%, 2%, 3%, 4%, or 5%.

[0082] In some embodiments of the arm segment manufacturing method, the method includes: when preparing the hoop-wound body, the angle between the first fiber and the axis of the arm segment 1 is 80° to 90°.

[0083] For example, when preparing a hoop-wound body, the angles between the first fiber and the axis of the arm segment 1 are 80°, 85°, and 90°.

[0084] In the manufacturing method of the arm section of some embodiments, before solidifying the matrix material, preparing each structural unit includes: providing an outer mold 3, which, in a closed state, can form an inner cavity that is adapted to a preset size of the outer contour of a structural unit located on the outermost side; and gradually closing the outer mold 3 from the outside of the structural unit to apply pressure to the outer contour of the structural unit so that the size of the outer contour of the structural unit located on the outermost side reaches a preset size.

[0085] Optionally, the outer mold 3 includes a plurality of outer mold plates that can be spliced ​​into one body, for example, Figure 2 and Figure 3 The outer mold 3 may include two outer mold plates with C-shaped cross sections and two outer mold plates with rectangular cross sections. Optionally, the inner mold 2 is made of Q550 steel, and the outer mold 3 is made of Q550 steel.

[0086] The outer mold 3 can be configured to include a series of combined molds that can be spliced ​​to form inner cavities of different sizes, so that when the structural units are prepared one by one from the inside to the outside, inner cavities that are compatible with the preset sizes of the outer contours of different structural units are formed.

[0087] In this embodiment, before the matrix material of each structural unit solidifies, uniform pressure can be applied to the first fibers impregnated with the matrix material within the structural unit by gradually closing the outer mold 3. This reduces the accumulation of matrix material in localized areas of the arm segment 1 and the formation of pores. With the outer mold 3 closed, the outer contours of the structural units can be adjusted to the preset shape and size under the action of pressure. This reduces the risk of cumulative shape and size errors after the multiple structural units are formed, and the surface of the formed arm segment 1 is regular, eliminating the need for further surface processing of the formed arm segment 1 and reducing the risk of fiber severance, which could lead to a decrease in the mechanical properties of the arm segment 1.

[0088] In the manufacturing method of the arm section of some embodiments, when preparing the structural unit, the curing temperature of the base material is 70° C. to 130° C., and the curing time is 0.5 h to 2 h.

[0089] When preparing the wear-resistant layer 12, the curing temperature of the base material can be, for example, 70°C, 80°C, 90°C, 100°C, 110°C, 120°C, or 130°C, and the curing time can be, for example, 0.5h, 1h, 1.5h, or 2h.

[0090] In the manufacturing method of the arm section of some embodiments, the arm section includes a wear-resistant layer 12 arranged on the outside of the arm section main body 11, and the manufacturing method includes: winding the first fiber and the wear-resistant fiber mixedly around the arm section main body 11 to form a composite fiber layer; placing the arm section main body 11 formed with the composite fiber layer in an outer mold 3 with an inner cavity, filling the matrix material and solidifying the matrix material.

[0091] Optionally, winding the first fibers and the wear-resistant fibers mixedly around the arm section body 11 includes: forming the first fibers and the wear-resistant fibers into a fiber fabric interwoven in a two-dimensional plane, and winding the fabric around the arm section body 11 .

[0092] Optionally, the matrix material is filled by vacuum infusion molding so that the matrix material can penetrate more evenly into the fibers in the wear-resistant layer 12, the matrix material and the reinforcing material can be more fully combined, the risk of generating bubbles and voids is reduced, and the surface after molding has good smoothness.

[0093] Optionally, refer to Figure 2 and Figure 3 The outer mold 3 with an inner cavity can adopt the aforementioned outer mold 3 including multiple outer templates that can be spliced ​​into one.

[0094] In this embodiment, a wear-resistant layer 12 containing wear-resistant fibers is formed on the surface of the boom section body 11 to enhance the wear resistance of the boom section 1. Furthermore, considering the relatively high cost of wear-resistant fibers, the wear-resistant layer 12 utilizes a mixed winding method of the first fiber and the wear-resistant fiber, thereby balancing the wear resistance and cost requirements of the boom section 1.

[0095] In the arm segment manufacturing method of some embodiments, the first fiber includes glass fiber, and / or the wear-resistant fiber includes one or more of aramid fiber, basalt fiber, and alumina fiber.

[0096] Optionally, the first fiber includes glass fiber, and the wear-resistant fiber includes basalt fiber. The glass fiber is E-grade glass fiber, with a single fiber diameter of 14 μm to 17 μm, a moisture content of ≤0.1%, a linear density of 2400 tex, an elastic modulus of ≥73 MPa, and a resistivity of ≥1.0×10 11 Ω·m; the monofilament diameter of basalt fiber is 13μm~17μm, the moisture content is ≤0.1%, the linear density is 2400tex or 4800tex, the elastic modulus is ≥95MPa, and the resistivity is ≥1.0×10 12 Ω·m.

[0097] In this embodiment, the first fiber in the arm section main body 11 is made of glass fiber, and the composite fiber layer is made of a mixed fiber of the first fiber and wear-resistant fiber. Glass fiber occupies a dominant position in the entire arm section 1, and the cost of glass fiber is only a fraction to nearly one percent of the cost of wear-resistant fiber, thereby effectively reducing the manufacturing cost of the entire arm section 1.

[0098] In the manufacturing method of the arm section in some embodiments, the mass ratio of the glass fiber to the wear-resistant fiber in the wear-resistant layer 12 is 2-10:1.

[0099] The mass ratio of glass fiber to wear-resistant fiber in the wear-resistant layer 12 can be, for example, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, or 10:1.

[0100] In this embodiment, the wear-resistant layer 12 can have good wear resistance within a limited mass ratio range, and the proportion of glass fiber in the wear-resistant layer 12 is relatively high, which is conducive to further reducing the manufacturing cost of the arm section.

[0101] In the manufacturing method of the arm section in some embodiments, when preparing the wear-resistant layer 12 , the curing temperature of the base material is 70° C. to 130° C., and the curing time is 1 hour to 2 hours.

[0102] When preparing the wear-resistant layer 12, the curing temperature of the base material can be, for example, 70°C, 80°C, 90°C, 100°C, 110°C, 120°C, or 130°C, and the curing time can be, for example, 1 hour, 1.5 hours, or 2 hours.

[0103] Optionally, the curing temperature of the base material when preparing the wear-resistant layer 12 is higher than the curing temperature of the base material when preparing the structural units of the arm section body 11. Optionally, the curing time of the base material when preparing the wear-resistant layer 12 is longer than the curing time of the base material when preparing the structural units of the arm section body 11.

[0104] The following takes the arm section of the insulating arm frame as an example to further describe the manufacturing method of the arm section of some embodiments of the present disclosure.

[0105] The arm section 1 of the insulating arm frame is a hollow columnar structure, comprising an arm section body 11 and a wear-resistant layer 12 formed on the outside of the arm section body 11. The arm section 1 is 8000 mm long, has a roughly rectangular cross-section of 300 mm x 400 mm, and is 18 mm thick.

[0106] Example

[0107] 1. Prepare the arm section body 11.

[0108] A mold release agent is evenly applied to the surface of the metal core mold serving as the inner mold 2 along the axial direction of the inner mold 2 to ensure that the arm section 1 is easy to demould after molding.

[0109] The resin, curing agent, accelerator, etc. are mixed in a mass ratio of 100:30:1.2 by an automatic glue dispensing machine to form a base material, and the base material is injected into the glue tank of the fiber winding equipment for standby use.

[0110] The fibers impregnated with the matrix material are laid and wound on the metal core mold through the laying mechanism and winding mechanism of the fiber winding equipment.

[0111] The fiber of the arm body 11 is made of glass fiber with a thickness of 15mm, which is divided into multiple structural units and solidified. The glass fiber is E-grade glass fiber with a single filament diameter of 17μm, a moisture content of 0.1%, a linear density of 2400tex, an elastic modulus of 75MPa, and a resistivity of 1.2×10 11 Ω·m.

[0112] Prepare multiple structural units, the specific steps are as follows:

[0113] 1) Prepare multiple spirally wound bodies.

[0114] The initial value of the winding tension of the glass fiber is 50N, and then the winding tension decreases layer by layer from the inside to the outside according to the number of fiber layers, with the winding tension decreasing by 3% for each layer; the winding speed of the glass fiber is 15m / min, and the thickness of the spiral winding body is 3.5mm.

[0115] Glass fiber is spirally wound layer by layer around the inner mold 2. Each spirally wound body is prepared as follows: starting from the innermost layer, a layer of glass fiber is spirally wound at an angle of z1 = 60°, followed by a layer of glass fiber spirally wound at an angle of z2 = 50°, and finally a layer of glass fiber spirally wound at an angle of z3 = 40°. Here, z1, z2, and z3 refer to the angles between the glass fiber and the axis of the arm section 1.

[0116] According to the fiber winding method for preparing a spiral winding body, the winding of the glass fibers in multiple spiral winding bodies is completed in sequence in a reciprocating cycle.

[0117] 2) A circumferential winding body is prepared on the outside of the plurality of spiral winding bodies.

[0118] The initial value of the winding tension of the glass fiber is 45N, and then the winding tension decreases layer by layer from the inside to the outside according to the number of fiber layers, with the winding tension decreasing by 3% for each layer; the winding speed of the glass fiber is 15m / min, the thickness of the hoop winding body is 1.5mm; and the winding angle of the glass fiber is 90°.

[0119] 3) Provide an outer mold 3 having multiple outer panels. Evenly apply a release agent to the inner surface of outer mold 3. After the hoop-wound body is prepared, position the outer panels of outer mold 3 correspondingly on the exterior of the structural unit. The panels are then slowly brought inward, and a certain amount of external force is applied to compress the structural unit formed from the glass fiber. When the end faces of any two adjacent outer panels in outer mold 3 are brought together, the outer contour of the structural unit is extruded to the predetermined shape and size.

[0120] 4) Place the entire component made in the previous step into a curing oven at 100°C for 1 hour to solidify the matrix material. After curing, remove the outer mold 3.

[0121] 5) Repeat steps 1) to 4) above, winding and curing three times to form the arm section body 11.

[0122] 2. Prepare the wear-resistant layer 12.

[0123] The wear-resistant layer 12 is mainly made of glass fiber and basalt fiber with a thickness of 3mm. The two fibers are woven and wound in a two-dimensional hybrid fiber method to form a composite fiber layer. The glass fiber is E-grade glass fiber with a single fiber diameter of 17μm, a moisture content of 0.1%, a linear density of 2400tex, an elastic modulus of 75MPa, and a resistivity of 1.2×10 11 Ω·m. The monofilament diameter of basalt fiber is 16μm, the moisture content is 0.1%, the linear density is 2400tex, the elastic modulus is 100MPa, and the resistivity is 5.5×10 12 Ω·m. The mass ratio of glass fiber to basalt fiber is 8:1.

[0124] A release agent is evenly applied to the inner surface of the outer mold 3. A certain external force is applied to secure the outer mold 3 to the exterior of the integral component formed in the previous step. This integral component is the arm segment body 11 formed with a composite fiber layer. The matrix material is then poured into the inner cavity of the outer mold 3 using vacuum infusion molding. It interacts with the composite fibers of the wear-resistant layer 12 and is then placed in a curing oven at 110°C for 1.5 hours to solidify the matrix material. After curing is complete, the inner mold 2 and outer mold 3 are removed, resulting in the arm segment 1 with the arm segment body 11 and the wear-resistant layer 12.

[0125] Comparative Example

[0126] A mold release agent is evenly applied to the surface of the metal core mold serving as the inner mold 2 along the axial direction of the inner mold 2 to ensure that the arm section 1 is easy to demould after molding.

[0127] The resin, curing agent, accelerator, etc. are mixed in a mass ratio of 100:30:1.2 by an automatic glue dispensing machine to form a base material, and the base material is injected into the glue tank of the fiber winding equipment for standby use.

[0128] The fibers impregnated with the matrix material are laid and wound on the metal core mold through the laying mechanism and winding mechanism of the fiber winding equipment.

[0129] The fiber of arm section 1 is made of glass fiber with a thickness of 18mm, which is divided into multiple structural units and solidified. The glass fiber is E-grade glass fiber with a single filament diameter of 17μm, a moisture content of 0.1%, a linear density of 2400tex, an elastic modulus of 75MPa, and a resistivity of 1.2×10 11 Ω·m.

[0130] Prepare multiple structural units, the specific steps are as follows:

[0131] 1) Prepare multiple spirally wound bodies.

[0132] The initial value of the winding tension of the glass fiber is 50N, and then the winding tension decreases layer by layer from the inside to the outside according to the number of fiber layers, with the winding tension decreasing by 3% for each layer; the winding speed of the glass fiber is 15m / min, and the thickness of the spiral winding body is 4mm.

[0133] Glass fiber is spirally wound layer by layer around the inner mold 2. Each spirally wound body is prepared as follows: starting from the innermost layer, a layer of glass fiber is spirally wound at an angle of z1 = 60°, followed by a layer of glass fiber spirally wound at an angle of z2 = 50°, and finally a layer of glass fiber spirally wound at an angle of z3 = 40°. Here, z1, z2, and z3 refer to the angles between the glass fiber and the axis of the arm section 1.

[0134] According to the fiber winding method for preparing a spiral winding body, the winding of the glass fibers in multiple spiral winding bodies is completed in sequence in a reciprocating cycle.

[0135] 2) A circumferential winding body is prepared on the outside of the plurality of spiral winding bodies.

[0136] The initial value of the winding tension of the glass fiber is 45N, and then the winding tension decreases layer by layer from the inside to the outside according to the number of fiber layers, with the winding tension decreasing by 3% for each layer; the winding speed of the glass fiber is 15m / min, the thickness of the hoop winding body is 2mm; and the winding angle of the glass fiber is 90°.

[0137] 3) Repeat steps 1) to 2) above until the dimensions of the multiple structural units reach the design dimensions of arm segment 1.

[0138] Apply a release agent evenly to the inner surface of outer mold 3. Apply a certain amount of force to secure outer mold 3 to the exterior of the integral component produced in the previous step. The integral component is then placed in a curing oven at 100°C for 1 hour to solidify the matrix material. After curing, remove inner mold 2 and outer mold 3 to obtain arm segment 1.

[0139] The burrs, bumps and uneven parts on the surface of the arm section 1 are polished and trimmed.

[0140] Under the same conditions, the mechanical properties of the arm section prepared in the embodiment and the arm section prepared in the comparative example were tested, and the obtained mechanical properties data are shown in Table 1.

[0141] Table 1 Mechanical properties of arm segments

[0142] Performance parameters Reference Standards Example Comparative Example Torsional stiffness test (load 1500kg, end torsion angle θ, degrees) Bench test 4 6.5 Bending stiffness test (load 2000kg, end deformation displacement, mm) Bench test 150 265 Wear resistance of boom extension operation Installation Verification No obvious scratches after 10,000 times of expansion and contraction The surface layer falls off after 3000 expansions and contractions

[0143] As can be seen from Table 1, compared with the arm section prepared in the comparative example, the arm section prepared in the embodiment has a smaller torsion angle and a greater torsional stiffness at the end portion of the arm section prepared in the embodiment under the same torsional load; under the same bending load, the arm section prepared in the embodiment has a smaller deformation at the end portion and a greater bending stiffness; and, even when the arm section prepared in the embodiment undergoes significantly more telescopic operations than the arm section prepared in the comparative example, the surface of the arm section still has no obvious scratches, demonstrating excellent wear resistance.

[0144] It can be seen that the embodiment pressurizes and solidifies each structural unit in the arm section body 11 separately. After the arm section is prepared and formed, it is less affected by deformation and does not need to go through steps such as polishing and surface finishing. The continuity of the fibers in the arm section is better, so that the arm section has higher torsional stiffness and bending stiffness. The embodiment provides a wear-resistant layer 12 on the outside of the arm section body 11, so that the arm section has excellent wear resistance.

[0145] Some embodiments of the present disclosure provide an arm section, which is manufactured by the arm section manufacturing method provided by the embodiments of the present disclosure.

[0146] The arm section provided by the embodiment of the present disclosure has the advantages of the arm section manufacturing method provided by the embodiment of the present disclosure.

[0147] Some embodiments of the present disclosure provide a boom, including the boom section provided by embodiments of the present disclosure.

[0148] Optionally, the boom includes one or more boom sections, and the boom may be a telescopic boom, a foldable boom, or a hybrid telescopic and foldable boom. The boom provided by the embodiment of the present disclosure has the advantages of the boom sections provided by the embodiment of the present disclosure.

[0149] Some embodiments of the present disclosure provide an engineering machine, including the boom provided by the embodiments of the present disclosure.

[0150] The engineering machinery may be, for example, an insulated boom truck, or other engineering machinery equipped with a boom, such as an insulated crane, a railway overhead line operation vehicle, or a ladder fire truck. The engineering machinery provided by the embodiments of the present disclosure has the advantages of the boom provided by the embodiments of the present disclosure.

[0151] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure and are not intended to limit them. Although the present disclosure has been described in detail with reference to preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present disclosure can still be modified or some technical features can be replaced by equivalents, which should all be included in the scope of the technical solutions claimed for protection in the present disclosure.

Claims

1. A method for manufacturing an arm segment, characterized in that: The arm section (1) includes an arm section body (11), and the manufacturing method includes: using an inner mold (2) as a core mold to prepare a plurality of structural units distributed from the inner side to the outer side of the arm section (1) to form the arm section body (11), and preparing each of the structural units includes: preparing a plurality of spirally wound bodies, including spirally winding a first fiber impregnated with a matrix material layer by layer; Preparing a hoop-wound body outside the plurality of spirally wound bodies, comprising winding first fibers impregnated with a matrix material layer by layer substantially along the circumference of the inner mold (2); and solidifying the matrix material; Wherein, in each of the structural units, along the direction from the inner side to the outer side of the arm section (1), The winding tension of the first fiber in the multiple layers of the first fiber in each of the spirally wound bodies decreases layer by layer, and the winding tension of the first fiber in each of the spirally wound bodies decreases sequentially; The winding tension of the first fibers in the multiple layers of the first fibers in the hoop-wound body decreases layer by layer; The angle between the first fiber and the axis of the arm segment (1) in the multiple layers of the first fiber in each of the spirally wound bodies changes layer by layer.

2. The method for manufacturing an arm section according to claim 1, characterized in that: Along the direction from the inside to the outside of the arm segment (1), the angle between the first fibers and the axis of the arm segment (1) in the multiple layers of the first fibers of each spirally wound body decreases layer by layer.

3. The method for manufacturing an arm section according to claim 2, characterized in that: The preparation of each spirally wound body includes spirally winding three layers of the first fiber, wherein the angles between each layer of the first fiber and the axis of the arm segment (1) are z1, z2, and z3, respectively, wherein z1=55°~65°, z2=45°~55°, and z3=30°~45°.

4. The method for manufacturing an arm section according to claim 1, characterized in that: Preparing a plurality of the spirally wound bodies comprises: The winding tension of the innermost layer of the first fibers in the plurality of spirally wound bodies is 30N to 60N; and / or Along the direction from the inside to the outside of the arm segment (1), the winding tension of the first fiber in the i+1th layer is reduced by 0.2% to 5% compared with the winding tension of the first fiber in the i-th layer, where i is a positive integer.

5. The method for manufacturing an arm section according to claim 1, characterized in that: The preparation of the hoop wound body comprises: The winding tension of the innermost layer of the first fiber in the hoop-wound body is 40N to 60N; and / or Along the direction from the inside to the outside of the arm segment (1), the winding tension of the first fiber in the i+1th layer is reduced by 0.2% to 5% compared with the winding tension of the first fiber in the ith layer, where i is a positive integer.

6. The method for manufacturing an arm section according to claim 1, characterized in that: include: When preparing the hoop-wound body, the angle between the first fiber and the axis of the arm segment (1) is 80° to 90°.

7. The method for manufacturing an arm section according to claim 1, characterized in that: Before solidifying the matrix material, preparing each of the structural units comprises: Providing an outer mold (3), wherein the outer mold (3) is capable of forming an inner cavity that is adapted to a preset size of the outer contour of one of the structural units located on the outermost side in a closed state; The outer mold (3) is gradually closed from the outside of the structural unit to apply pressure to the outer contour of the structural unit, so that the size of the outer contour of the structural unit located at the outermost side reaches a preset size.

8. The method for manufacturing an arm section according to claim 1, characterized in that: When preparing the structural unit, the curing temperature of the base material is 70° C. to 130° C., and the curing time is 0.5 h to 2 h.

9. The method for manufacturing a boom section according to any one of claims 1 to 8, characterized in that: The arm section comprises a wear-resistant layer (12) arranged on the outside of the arm section body (11), and the manufacturing method comprises: Winding the first fibers and wear-resistant fibers mixedly around the arm section body (11) to form a composite fiber layer; Providing an outer mold (3), the outer mold (3) having an inner cavity adapted to a preset size of the outer contour of the wear-resistant layer (12), and placing the arm section body (11) formed with the composite fiber layer in the inner cavity of the outer mold (3); Filling the inner cavity of the outer mold (3) with a matrix material, and solidifying the matrix material.

10. The method for manufacturing an arm section according to claim 9, characterized in that: The first fiber includes glass fiber, and / or the wear-resistant fiber includes one or more of aramid fiber, basalt fiber and alumina fiber.

11. The method for manufacturing an arm section according to claim 10, characterized in that: The mass ratio of the glass fiber to the wear-resistant fiber in the wear-resistant layer (12) is 2-10:

1.

12. The method for manufacturing an arm section according to claim 9, characterized in that: When preparing the wear-resistant layer (12), the curing temperature of the base material is 70°C to 130°C, and the curing time is 1h to 2h.

13. A boom section, characterized in that: The arm segment is manufactured by the manufacturing method according to any one of claims 1 to 12.

14. A boom, characterized in that: Comprising an arm section according to claim 13.

15. An engineering machine, characterized in that: Comprising an arm section according to claim 13.

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