Composite material scraper, scraper conveyor and preparation method

Abstract

The invention relates to the technical field of coal mine machinery, and discloses a composite material scraper, a scraper conveyor and a preparation method. The composite material scraping plate comprises a core plate, a cladding plate and a scraping plate main body. The cladding plate is arranged on one side of the core plate. And the material of the core plate and the material of the cladding plate comprise a continuous fiber reinforced resin composite material. The scraper body is arranged on the side, away from the cladding plate, of the core plate. And the material of the scraper main body comprises a discontinuous fiber reinforced resin composite material. The overall strength, impact resistance and wear resistance of the composite material scraper blade are improved, and the molding and manufacturing convenience of the composite material scraper blade is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of coal mine machinery, and specifically relates to a composite material scraper, a scraper conveyor and a preparation method thereof. Background Art

[0002] The scrapers of coal mining machinery have complex shapes and extremely high performance requirements. They must not only meet the requirements of mechanical properties, but also the requirements of wear resistance and impact resistance. Scrapers are mainly made of metal, and it is difficult to optimize the weight, strength and wear resistance of metal scrapers.

[0003] In the related art, a composite scraper is provided, which is mainly prepared by extrusion molding or online injection molding to prepare a core plate, and then a wear-resistant resin layer is coated on the outer layer of the core plate to prepare a scraper body. The core plate is made of fiber-reinforced composite material.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that there are at least the following problems in the related art:

[0005] In the composite scraper of the related art, only the core plate is made of fiber-reinforced composite material, so the fiber content of the scraper is not high, and there are problems of insufficient strength and rigidity. Under the condition of large working load, it is easy to fail to work normally due to excessive deformation or fracture. Summary of the invention

[0006] The present application aims to solve at least one of the technical problems existing in the related art.

[0007] Therefore, a first aspect of the present application provides a composite blade.

[0008] A second aspect of the present application provides a scraper conveyor.

[0009] A third aspect of the present application provides a method for preparing a composite scraper.

[0010] In view of this, according to the first aspect of an embodiment of the present application, a composite scraper is proposed, comprising: a core plate; a cladding plate, arranged on one side of the core plate, the material of the core plate and the material of the cladding plate include continuous fiber reinforced resin composite materials; a scraper body, arranged on the side of the core plate away from the cladding plate, the material of the scraper body includes non-continuous fiber reinforced resin composite materials.

[0011] Optionally, the composite scraper also includes: a first boss, which is arranged on the scraper body and protrudes in a direction away from the core plate; a first groove, which is arranged at the first boss of the scraper body, and the notch of the first groove faces the core plate; a second boss, which is arranged on the core plate and corresponds to the first groove, and the second boss is embedded in the first groove.

[0012] Optionally, the composite material scraper further includes: a second groove, which is arranged on the scraper body and is adjacent to the first boss.

[0013] Optionally, the covering plate includes: a flanging, and the flanging covers the side surface of the core plate.

[0014] Optionally, the continuous fiber reinforced resin composite material includes continuous fibers and a resin matrix; the discontinuous fiber reinforced resin composite material includes discontinuous fibers and a resin matrix; wherein, the length of the discontinuous fibers is less than the length of the scraper body.

[0015] Optionally, the length of the discontinuous fibers is 1 mm to 50 mm.

[0016] Optionally, the resin matrix includes one or more of polyamide, polyethylene, polypropylene, polyurethane, polytetrafluoroethylene, polyoxymethylene, polycarbonate, polyphenylene sulfide, and polyaryletherketone; wherein, the resin matrix of the continuous fiber reinforced resin composite material is the same as the resin matrix of the discontinuous fiber reinforced resin composite material.

[0017] Optionally, the core plate, the covering plate, and the scraper body are formed by an integrated molding method of compression molding and injection molding.

[0018] According to a second aspect of the embodiments of the present application, a scraper conveyor is provided, including: a chain; a composite material scraper as in any previous embodiment, which is installed on the chain.

[0019] According to a third aspect of the embodiments of the present application, a preparation method of a composite material scraper is provided, which is used to prepare the composite material scraper as in any previous embodiment. The preparation method includes the following steps: heating a first plate to softening and then putting it into a mold; heating a second plate to softening and then putting it into the mold, and the second plate is located on the first plate; preheating the discontinuous fiber reinforced resin composite material in an injection molding machine; performing compression molding on the first plate and the second plate so that the first plate forms a covering plate and the second plate forms a core plate; meanwhile, the injection molding machine injects the preheated discontinuous fiber reinforced resin composite material into the mold to form a scraper body on the core plate and the covering plate; wherein, the materials of the first plate and the second plate include continuous fiber reinforced resin composite materials.

[0020] The composite material scraper, the scraper conveyor, and the preparation method provided by the present application can at least achieve the following technical effects:

[0021] The composite material scraper of the present application includes a scraper body, a core plate, and a cladding plate. The material of the core plate includes a continuous fiber reinforced resin composite material with good mechanical properties to improve the strength of the core plate. The material of the cladding plate includes a continuous fiber reinforced resin composite material with good mechanical properties to improve the strength of the cladding plate. The overall strength, impact resistance, and wear resistance of the composite material scraper are improved through the core plate and the cladding plate. The material of the scraper body includes a discontinuous fiber reinforced resin composite material with good formability, which improves the convenience of forming manufacturing while achieving high strength of the composite material scraper and realizes connection with other parts (such as chains).

[0022] The above general description and the following description are only exemplary and explanatory, and are not used to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] One or more embodiments are exemplarily illustrated by corresponding drawings. These exemplary illustrations and the drawings do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a proportional limitation, and among them:

[0024] Figure 1 is a schematic structural diagram of a composite material scraper provided by an embodiment of the present disclosure from one perspective;

[0025] Figure 2 is a schematic structural diagram of a composite material scraper provided by an embodiment of the present disclosure from another perspective;

[0026] Figure 3 is an exploded structural diagram of a composite material scraper provided by an embodiment of the present disclosure;

[0027] Figure 4 is a schematic structural diagram of a scraper body provided by an embodiment of the present disclosure;

[0028] Figure 5 is a schematic diagram of the layout relationship between the core plate and the cladding plate provided by an embodiment of the present disclosure;

[0029] Figure 6 is a schematic diagram of a partial structure of a scraper conveyor provided by an embodiment of the present disclosure;

[0030] Figure 7 is a flowchart of a preparation method of a composite material scraper provided by an embodiment of the present disclosure.

[0031] The reference numerals are represented as:

[0032] 10: composite material scraper; 11: first boss; 12: first groove; 13: second boss; 14: second groove; 15: axe

[0033] 20: Core board; 21: First end plate; 22: Intermediate plate; 23: Second end plate;

[0034] 30: Cladding plate; 31: Flange;

[0035] 40: Scraper body;

[0036] 50: Scraper conveyor; 51: Chain. Detailed implementation manners

[0037] In order to more thoroughly understand the features and technical content of the embodiments of the present disclosure, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. The attached drawings are for reference and illustration purposes only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the sake of explanation, numerous details are provided to give a full understanding of the disclosed embodiments. However, one or more embodiments can still be implemented without these details. In other cases, well-known structures and devices can be shown in a simplified manner to simplify the drawings.

[0038] In the embodiments of the present disclosure, the terms "first", "second", etc. in the specification, claims and the above-mentioned drawings are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to implement the embodiments of the present disclosure described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0039] In the embodiments of the present disclosure, the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the embodiments of the present disclosure and their implementations, and are not used to limit that the indicated devices, elements or components must have a specific orientation or be constructed and operated in a specific orientation. And, in addition to being able to represent an orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0040] In addition, the terms "arrange", "connect", "fix" should be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can also be internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0041] Unless otherwise specified, the term "plurality" means two or more.

[0042] In the embodiments of the present disclosure, the character " / " indicates that the objects before and after are in an "or" relationship. For example, A / B means: A or B.

[0043] The term "and / or" is an associative relationship describing an object, indicating that there can be three relationships. For example, A and / or B means: A or B, or, the three relationships of A and B.

[0044] It should be noted that, without conflict, the embodiments in the embodiments of the present disclosure and the features in the embodiments can be combined with each other.

[0045] As Figures 1 to 5 shown, the embodiments of the present disclosure provide a composite material scraper 10. The composite material scraper 10 includes a core plate 20, a cladding plate 30, and a scraper body 40. The cladding plate 30 is disposed on one side of the core plate 20. The materials of the core plate 20 and the cladding plate 30 include continuous fiber reinforced resin composite materials. The scraper body 40 is disposed on the side of the core plate 20 away from the cladding plate 30. The material of the scraper body 40 includes discontinuous fiber reinforced resin composite material.

[0046] In this embodiment, the composite material scraper 10 includes a core plate 20, a cladding plate 30, and a scraper body 40. Among them, the scraper body 40, the core plate 20, and the cladding plate 30 are sequentially stacked to form a composite material scraper 10 with a three-layer composite structure, which improves the overall strength while realizing convenient molding and realizing the connection function.

[0047] In this embodiment, the materials of the core plate 20 and the cladding plate 30 include continuous fiber reinforced resin composite materials. That is to say, the material of the core plate 20 includes continuous fiber reinforced resin composite materials, and the material of the cladding plate 30 includes continuous fiber reinforced resin composite materials. Specifically, the material of the core plate 20 includes a continuous fiber reinforced resin composite material with good mechanical properties, which can improve the strength of the core plate 20. The material of the cladding plate 30 includes a continuous fiber reinforced resin composite material with good mechanical properties, which can improve the strength of the cladding plate 30. In this embodiment, the overall strength, impact resistance, and wear resistance of the composite material scraper 10 are improved through the core plate 20 and the cladding plate 30.

[0048] In this embodiment, the material of the scraper body 40 includes discontinuous fiber reinforced resin composite material. The discontinuous fiber reinforced resin composite material has good molding performance, can improve the convenience of molding manufacturing while realizing the high strength of the composite material scraper 10, and realizes the connection function of the composite material scraper 10 with other parts (such as the contact surface of the pressing plate, the contact surfaces of the flat ring and vertical ring of the chain 51, the contact surface of the bolt and nut, etc.).

[0049] Specifically, the scraper body 40, the core plate 20, and the covering plate 30 can be sequentially stacked to form a three-layer composite material scraper 10. The positions of the composite material scraper 10 for pushing materials are the core plate 20 and the covering plate 30 formed of continuous fiber reinforced resin composite materials, which improve the overall strength and impact resistance and wear resistance. The connectable position of the composite material scraper 10 is the scraper body 40 formed of discontinuous fiber reinforced resin composite materials, which realizes connection with other parts (such as the contact surface with the pressing plate, the contact surfaces with the flat rings and vertical rings of the chain 51, the contact surfaces of bolts and nuts, etc.) while improving the strength and is convenient for molding and manufacturing. In actual application, the scraper body 40 can also be generally interchanged with other connectors, reducing costs.

[0050] In actual application, the composite material scraper 10 of this embodiment is applicable to ultra-heavy scraper conveyor equipment with a trough width of more than 1000 mm, such as large mining height, high gangue content, and inclined working face coal seams. Specifically, for ultra-heavy scraper conveyor equipment, the working condition load is large, the strength requirement for the scraper is high, and the requirements for impact resistance and wear resistance are high. The composite material scraper 10 of this embodiment has high overall strength, good impact resistance and wear resistance on the contact surface, is applicable to ultra-heavy scraper conveyor equipment, and can meet the requirements of reducing wear and no-load power consumption, and improving the reliability and service life of the equipment.

[0051] As Figures 1 to 5 shown, in some embodiments, the composite material scraper 10 further includes a first boss 11, a first groove 12, and a second boss 13. The first boss 11 is provided on the scraper body 40, and the first boss 11 protrudes in a direction away from the core plate 20. The first groove 12 is provided at the first boss 11 of the scraper body 40. The notch of the first groove 12 faces the core plate 20. The second boss 13 is provided on the core plate 20, and the second boss 13 corresponds to the first groove 12. The second boss 13 is embedded in the first groove 12.

[0052] In this embodiment, the first boss 11 protrudes away from the core plate 20, that is, the first boss 11 is disposed on the side of the scraping blade body 40 facing away from the core plate 20. The first groove 12 is disposed at the first boss 11 of the scraping blade body 40. The notch of the first groove 12 faces the core plate 20, that is, the first groove 12 is opened on the side of the scraping blade body 40 facing the core plate 20. The first groove 12 is located at the position of the first boss 11 and extends into the first boss 11. The second boss 13 is disposed on the core plate 20. The second boss 13 corresponds to the first groove 12, that is, the second boss 13 is disposed on the side of the core plate 20 facing the scraping blade body 40. The second boss 13 can be embedded in the first groove 12, so that the second boss 13 is embedded in the first boss 11. By embedding the second boss 13 in the first boss 11, the fitting degree between the scraping blade body 40 and the core plate 20 can be effectively enhanced. Embedding the second boss 13 made of continuous fiber reinforced resin composite material into the first boss 11 made of discontinuous fiber reinforced resin composite material integrally connects the scraping blade body 40 and the core plate 20, and improves the strength and stiffness when the composite material scraping blade 10 contacts other parts (such as the vertical link of the chain 51).

[0053] In actual application, the scraping blade body 40 can be used as the structure for realizing the connection function of the composite material scraping blade 10. The core plate 20 can be used as the anti-bending deformation structure and the traction force bearing structure of the composite material scraping blade 10. The covering plate 30 can be used as the anti-wear and anti-impact structure of the composite material scraping blade 10. The second boss 13 disposed on the core plate 20 can be used as the traction force bearing structure of the composite material scraping blade 10. Through the cooperation of the scraping blade body 40, the core plate 20 and the covering plate 30, the stiffness of the composite material scraping blade 10 is improved, so that the overall flexural deformation amount of the composite material scraping blade 10 meets the requirements of using ultra-heavy scraping conveying equipment (such as the scraping conveyor 50).

[0054] Optionally, one or more first bosses 11 are provided. One or more first grooves 12 are provided. One or more second bosses 13 are provided. When a plurality of first bosses 11, a plurality of first grooves 12 and a plurality of second bosses 13 are provided, the plurality of first bosses 11, the plurality of first grooves 12 and the plurality of second bosses 13 correspond to each other one by one.

[0055] In this embodiment, by making the plurality of first bosses 11, the plurality of first grooves 12 and the plurality of second bosses 13 correspond to each other one by one, the overall strength of the composite material scraping blade 10 is improved.

[0056] Optionally, as Figure 3As shown, the core plate 20 includes a first end plate 21, an intermediate plate 22, and a second end plate 23 arranged in sequence. The first end plate 21, the intermediate plate 22, and the second end plate 23 are of an integral structure. The second boss 13 is provided on the intermediate plate 22. Among them, relative to the first end plate 21 and the second end plate 23, the intermediate plate 22 protrudes in a direction away from the scraper body 40, and there is a smooth transition between the intermediate plate 22 and the first end plate 21, and a smooth transition between the intermediate plate 22 and the second end plate 23.

[0057] In this embodiment, the first end plate 21, the intermediate plate 22, and the second end plate 23 are of an integral structure. That is to say, the core plate 20 is a whole continuous fiber reinforced resin composite material plate, which improves the strength, stiffness, and bending resistance of the core plate 20. Relative to the first end plate 21 and the second end plate 23, the intermediate plate 22 protrudes in a direction away from the scraper body 40, making the core plate 20 as a whole in a bow-shaped structure. Through the whole bow-shaped continuous fiber reinforced resin composite material plate, the strength, stiffness, and bending resistance of the composite material scraper 10 are improved.

[0058] In some embodiments, as Figures 1 to 4 shown, the composite material scraper 10 further includes a second groove 14. The second groove 14 is provided on the scraper body 40, and the second groove 14 is adjacent to the first boss 11.

[0059] In this embodiment, the second groove 14 is adjacent to the first boss 11. In actual application, the second groove 14 is used to place the chain 51 to realize the connection between the composite material scraper 10 and other parts, and improve the strength and stiffness when the composite material scraper 10 contacts other parts.

[0060] Optionally, as Figures 1 to 4 shown, second grooves 14 are provided on both opposite sides of each first boss 11.

[0061] In some embodiments, as Figure 3 and Figure 5 shown, the cladding plate 30 includes a flanging 31. The flanging 31 covers the side surface of the core plate 20.

[0062] In this embodiment, the cladding plate 30 is arranged on one side of the core plate 20, and the flanging 31 of the cladding plate 30 covers the side surface of the core plate 20 to form a high-strength and high-wear-resistant shell, forming an anti-wear and anti-impact protective shell for the core plate 20 to protect the core plate 20.

[0063] Specifically, the cladding plate 30 with the flanging 31 can be formed by hot pressing a continuous fiber reinforced resin composite material plate. The core plate 20 can adopt a whole continuous fiber reinforced resin composite material plate. As Figure 5As shown, the flange 31 of the cladding plate 30 clads the side surface of the core plate 20, that is, the core plate 20 is embedded in the housing formed by the cladding plate 30 with the flange 31, so that the cladding plate 30 protects the core plate 20, further improving the overall strength, stiffness, wear resistance and impact resistance of the composite material scraper 10.

[0064] During actual application, Figure 2 It is a schematic diagram of the composite material scraper in the working state. Both ends of the composite material scraper 10 are axes 15. When the composite material scraper 10 pushes the material, the surface of the axis 15 is the contact surface in contact with the material. Through the contact surface being the cladding plate 30 of the continuous fiber reinforced resin composite material, the overall strength and wear resistance of the composite material scraper 10 are improved. Specifically, the position where the cladding plate 30 clads the core plate 20 is the easily worn position of the composite material scraper 10. When the composite material scraper 10 is applied to the scraper conveyor 50, by cladding the core plate 20 with the cladding plate 30, the wear resistance of the axis 15 can be improved, and the impact resistance of the front and rear side surfaces of the composite material scraper 10 along the chute direction of the scraper conveyor 50 can be improved. Moreover, the second groove 14 of the composite material scraper 10 can be in contact with the chain 51. By embedding the second boss 13 into the first boss 11, the strength of the contact position between the composite material scraper 10 and the chain 51 is improved. In summary, the composite material scraper 10 as a whole has good strength and stiffness.

[0065] Optionally, the thickness of the core plate 20 is 10 mm to 100 mm.

[0066] During actual application, Figure 2 The straight arrow at a in the figure can be used to indicate the thickness direction of the core plate 20, the scraper main body 40 and the cladding plate 30 at a. The thickness of the single-layer continuous fiber reinforced resin composite material is 0.1 mm to 0.5 mm. By designing the layup and size of the continuous fiber reinforced resin composite material, a multi-layer continuous fiber reinforced resin composite material layer can be obtained, so as to obtain the core plate 20 with a thickness of 10 mm to 100 mm after hot pressing. In this embodiment, by the flange 31 of the cladding plate 30 cladding the side surface of the core plate 20, the impact resistance of the composite material scraper 10 is improved, the risk of delamination when the composite material scraper 10 is subjected to impact load is reduced, and the service life is prolonged.

[0067] It should be noted that the layup method of the continuous fiber reinforced resin composite material is not limited. For example, the 0° / 90° layup method is adopted.

[0068] In this embodiment, the specific strength and specific modulus of the continuous fiber reinforced resin composite material and the discontinuous fiber reinforced resin composite material are high, they are corrosion-resistant, have good impact resistance, and are light in weight. The lightweight, high-strength, and corrosion-resistant composite material scraper 10 can be realized. For example, for the same type of scraper, compared with the metal scraper, the composite material scraper 10 of this embodiment can achieve a weight reduction of greater than or equal to 60%. By combining the continuous fiber reinforced resin composite material and the discontinuous fiber reinforced resin composite material, the manufacturing difficulty is reduced. Specifically, the scraper is a complex structural part with a large thickness, a large length-diameter ratio, non-uniform thickness, and multiple curved surfaces, and has high load-bearing performance requirements. By combining the continuous fiber reinforced resin composite material and the discontinuous fiber reinforced resin composite material, the layup process can be simplified, which helps the forming of local complex structures and reduces the overall manufacturing difficulty.

[0069] Optionally, the thickness of the scraper body 40 is 10 mm to 100 mm.

[0070] Optionally, the thickness of the cladding plate 30 is 2 mm to 10 mm.

[0071] In some embodiments, the continuous fiber reinforced resin composite material includes continuous fibers and a resin matrix. The discontinuous fiber reinforced resin composite material includes discontinuous fibers and a resin matrix. Among them, the length of the discontinuous fibers is less than the length of the scraper body 40.

[0072] In this embodiment, the continuous fiber reinforced resin composite material includes continuous fibers and a resin matrix. Specifically, the continuous fibers can be used as the reinforcing phase of the continuous fiber reinforced resin composite material, which can bear most of the loads and improve the strength and toughness. The resin matrix can be used to bond the continuous fibers together, transfer stress, and protect the continuous fibers.

[0073] In this embodiment, the discontinuous fiber reinforced resin composite material includes discontinuous fibers and a resin matrix. Specifically, the discontinuous fibers can be used as the reinforcing phase of the discontinuous fiber reinforced resin composite material. The resin matrix can be used to bond the discontinuous fibers together, transfer stress, and protect the discontinuous fibers.

[0074] It should be noted that in the continuous fiber reinforced resin composite material, the proportion of the continuous fibers and the resin matrix is not limited and can be set according to needs. In the discontinuous fiber reinforced resin composite material, the proportion of the discontinuous fibers and the resin matrix is not limited and can be set according to needs.

[0075] It should be noted that both continuous fibers and discontinuous fibers are fibers. For example, continuous fibers are one or more of glass fibers, carbon fibers, basalt fibers, aramid fibers, quartz fibers, and polyimide fibers. For another example, discontinuous fibers are one or more of glass fibers, carbon fibers, basalt fibers, aramid fibers, quartz fibers, and polyimide fibers. The difference between continuous fibers and discontinuous fibers is that the length of continuous fibers is longer than that of discontinuous fibers. It can be understood that continuous fibers can be fibers that are nearly infinitely long (for example, the length of the fiber is much greater than the diameter). In applications, for example, in the length direction of the core plate 20, the length of the continuous fibers is uninterrupted. For another example, in the length direction of the cladding plate 30, the length of the continuous fibers is uninterrupted. For another example, the length of the discontinuous fibers is less than the length of the scraper body 40.

[0076] In some embodiments, the length of the discontinuous fibers is from 1 mm to 50 mm.

[0077] In this embodiment, the length of the discontinuous fibers is from 1 mm to 50 mm, making the discontinuous fiber reinforced resin composite have good molding properties.

[0078] Optionally, the length of the discontinuous fibers is 1 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm or other values between 1 mm and 50 mm.

[0079] Exemplarily, the length of the core plate 20 is from 400 mm to 2000 mm. The length of the cladding plate 30 is from 400 mm to 2000 mm. The length of the scraper body 40 is from 400 mm to 2000 mm. The length of the discontinuous fibers is from 1 mm to 50 mm.

[0080] In some embodiments, the resin matrix includes one or more of polyamide, polyethylene, polypropylene, polyurethane, polytetrafluoroethylene, polyoxymethylene, polycarbonate, polyphenylene sulfide, and polyaryletherketone. Among them, the resin matrix of the continuous fiber reinforced resin composite is the same as that of the discontinuous fiber reinforced resin composite.

[0081] Specifically, the resin matrix of the continuous fiber reinforced resin composite includes thermoplastic resins. Thermoplastic resins include one or more of polyamide, polyethylene, polypropylene, polyurethane, polytetrafluoroethylene, polyoxymethylene, polycarbonate, polyphenylene sulfide, and polyaryletherketone.

[0082] Specifically, the resin matrix of the discontinuous fiber reinforced resin composite includes thermoplastic resins. Thermoplastic resins include one or more of polyamide, polyethylene, polypropylene, polyurethane, polytetrafluoroethylene, polyoxymethylene, polycarbonate, polyphenylene sulfide, and polyaryletherketone.

[0083] In this embodiment, the resin matrix of the continuous fiber reinforced resin composite material is the same as that of the discontinuous fiber reinforced resin composite material. For example, the resin matrix of the continuous fiber reinforced resin composite material is polyamide, and the resin matrix of the discontinuous fiber reinforced resin composite material is also polyamide. For another example, the resin matrix of the continuous fiber reinforced resin composite material is polypropylene, and the resin matrix of the discontinuous fiber reinforced resin composite material is also polypropylene. By making the resin matrix of the continuous fiber reinforced resin composite material the same as that of the discontinuous fiber reinforced resin composite material, the interfacial bonding strength between the continuous fiber layer and the discontinuous fiber layer is improved, and further the bonding strength between the scraper body 40 and the core plate 20 and the covering plate 30 is improved, so as to improve the overall strength of the composite material scraper 10.

[0084] Optionally, the polyaryletherketone includes one or more of polyetherketone (PEK), polyetheretherketone (PEEK), and polyetherketoneketone (PEKK).

[0085] Optionally, the continuous fiber reinforced resin composite material further includes one or more of wear-resistant additives, flame retardants, anti-aging agents, and compatibilizers. The compatibilizer is used to enhance the bonding strength between the fiber and the resin. It can be understood that the specific type of the wear-resistant additive is not limited. For example, graphite, graphene, and carbon nanotubes. And the addition amounts of the wear-resistant additive, flame retardant, anti-aging agent, and compatibilizer are not limited.

[0086] Optionally, the discontinuous fiber reinforced resin composite material further includes one or more of wear-resistant additives, flame retardants, anti-aging agents, and compatibilizers. The compatibilizer is used to enhance the bonding strength between the fiber and the resin. It can be understood that the specific type of the wear-resistant additive is not limited. For example, graphite, graphene, and carbon nanotubes. And the addition amounts of the wear-resistant additive, flame retardant, anti-aging agent, and compatibilizer are not limited.

[0087] In some embodiments, the core plate 20, the covering plate 30, and the scraper body 40 are formed by an integrated molding method of compression molding and injection molding.

[0088] In this embodiment, the core plate 20, the covering plate 30, and the scraper body 40 are formed by an integrated molding method of compression molding and injection molding. Specifically, the core plate 20, the covering plate 30, and the scraper body 40 adopt an integrated molding technology of compression molding and injection molding, and the functions of hot pressing and injection molding are completed on a set of molds, realizing the rapid molding preparation of the composite material scraper 10 and reducing the cost. During the injection molding process of the discontinuous fiber reinforced resin composite material, the molding fluidity is good, which helps the integrated molding effect of the compression molding and injection molding of the composite material scraper 10 and improves the overall strength.

[0089] Specifically, the composite material scraper 10 is integrally formed by a continuous fiber reinforced resin composite material with excellent mechanical properties and a discontinuous fiber reinforced resin composite material with good molding fluidity. Among them, the core plate 20 and the covering plate 30 are prepared by hot pressing using a continuous fiber reinforced resin composite material. The scraper main body 40 is prepared by injection molding using a discontinuous fiber reinforced resin composite material. That is, the hot pressing process and the injection molding process are completed simultaneously in the same set of molds, which can achieve the rapid molding and low-cost manufacturing of the composite material scraper 10.

[0090] In the related art, the scraper is prepared by a step-by-step die pressing process. The molding efficiency of the scraper is low, and it is difficult to control the bonding quality between different plates of the scraper (for example, the core plate and the scraper main body), resulting in an increased risk of delamination failure of the scraper under impact loads. In this embodiment, the core plate 20, the covering plate 30, and the scraper main body 40 are formed by an integrated molding method of die pressing and injection molding, which simplifies the preparation process, improves the efficiency, and improves the impact resistance.

[0091] It should be noted that, except for the above structure, other structures of the composite material scraper 10 are not limited and can be designed according to actual needs.

[0092] As Figures 1 to 6 shown, the present disclosure embodiment also provides a scraper conveyor 50. The scraper conveyor 50 includes a chain 51 and a composite material scraper 10 as in any previous embodiment. The composite material scraper 10 is installed on the chain 51.

[0093] In this embodiment, the scraper conveyor 50 includes a composite material scraper 10 as in any previous embodiment. Therefore, it has the beneficial effects of the composite material scraper 10 as in any previous embodiment, which will not be elaborated here.

[0094] In this embodiment, the composite material scraper 10 is installed on the chain 51, and the chain 51 can drive the composite material scraper 10 to move to achieve the transportation of materials.

[0095] As Figure 7 shown, the present disclosure embodiment also provides a preparation method of the composite material scraper 10 for preparing the composite material scraper 10 as in any previous embodiment. The preparation method includes the following steps:

[0096] S701. Heat the first plate to softening and then place it in the mold.

[0097] In this embodiment, the material of the first plate is a continuous fiber reinforced resin composite material for forming the covering plate 30. After the first plate is heated to softening, it is convenient for the covering plate 30 to be molded by die pressing in the mold.

[0098] It should be noted that the heating temperature for heating the first plate to softening is not limited and is determined according to the specific material of the continuous fiber reinforced resin composite material. For example, when the continuous fiber reinforced resin composite material is a continuous carbon fiber reinforced nylon composite material, the heating temperature can be 220°C to 260°C.

[0099] It should be noted that the specific structure of the mold is not limited, and the integrated molding technology of compression molding and injection molding can be adopted, as long as the functions of hot pressing and injection molding can be completed simultaneously on a set of molds.

[0100] It should be noted that the shape of the first plate is not limited, as long as it can form the cladding plate 30 after compression molding.

[0101] S702. Heat the second plate to softening and then place it in the mold. The second plate is located on the first plate.

[0102] In this embodiment, the material of the second plate is a continuous fiber reinforced resin composite material, which is used to form the core plate 20. After the second plate is heated to softening, it is convenient for the core plate 20 to be compression molded in the mold. The second plate is located on the first plate and is used to make the cladding plate 30 cover the core plate 20 during compression molding to form an integral body as Figure 5 shown.

[0103] It should be noted that the heating temperature for heating the second plate to softening is not limited and is determined according to the specific material of the continuous fiber reinforced resin composite material. For example, when the continuous fiber reinforced resin composite material is a continuous carbon fiber basalt fiber reinforced PP (polypropylene) composite material, the heating temperature can be 200°C.

[0104] It should be noted that the shape of the second plate is not limited, as long as it can form the core plate 20 after compression molding.

[0105] S703. Put the discontinuous fiber reinforced resin composite material into the injection molding machine for preheating.

[0106] In this embodiment, the discontinuous fiber reinforced resin composite material is put into the injection molding machine for preheating. The discontinuous fiber reinforced resin composite material melts in the injection molding machine and becomes in a flowing state, so that the preheated discontinuous fiber reinforced resin composite material can cover the integral body of the core plate 20 and the cladding plate 30 (as Figure 5 shown).

[0107] It should be noted that the preheating temperature of the discontinuous fiber reinforced resin composite material is not limited and is determined according to the specific material of the discontinuous fiber reinforced resin composite material. For example, when the discontinuous fiber reinforced resin composite material is a discontinuous carbon fiber reinforced nylon composite material, the preheating temperature is 260°C. Another example is that when the discontinuous fiber reinforced resin composite material is a discontinuous basalt fiber reinforced PP (polypropylene) composite material, the preheating temperature is 220°C.

[0108] S704. Mold press the first plate and the second plate so that the first plate forms a cladding plate and the second plate forms a core plate. Meanwhile, an injection molding machine injects a preheated discontinuous fiber-reinforced resin composite material into the mold to form a blade body on the core plate and the cladding plate.

[0109] Wherein, the materials of the first plate and the second plate include continuous fiber-reinforced resin composite materials.

[0110] In this embodiment, the mold can be installed on a mold press, and the mold press is closed for mold pressing so that the first plate is hot-pressed into a cladding plate 30 and the second plate is hot-pressed into a core plate 20. At this time, the cladding plate 30 can cover the core plate 20 to form an integral body as shown in Figure 5 the figure. The injection molding machine injects a preheated discontinuous fiber-reinforced resin composite material into the mold, so that the discontinuous fiber-reinforced resin composite material covers the integral body of the cladding plate 30 and the core plate 20, that is, a blade body 40 is formed on the integral body of the cladding plate 30 and the core plate 20, completing the integrated mold pressing and injection molding of the composite material blade 10, improving the efficiency, reducing the cost, and being able to improve the overall strength and impact resistance and wear resistance of the composite material blade 10.

[0111] It should be noted that the specific types of the mold press and the injection molding machine are not limited as long as they can achieve the integrated mold pressing and injection molding. The working parameters of the mold press and the injection molding machine are not limited and can be determined according to the type of the material.

[0112] Optionally, the preparation method further includes the following step: demold after cooling.

[0113] Specifically, after step S704, a demolding step after cooling is carried out to obtain the composite material blade 10.

[0114] Embodiment 1

[0115] The composite material blade 10 includes a core plate 20, a cladding plate 30 and a blade body 40. Both the core plate 20 and the cladding plate 30 are made of continuous carbon fiber-reinforced nylon composite materials, and the blade body 40 is made of discontinuous carbon fiber-reinforced nylon composite materials.

[0116] In this embodiment, the preparation method of the composite material blade 10 is as follows:

[0117] Heat the first plate to 240 °C until it softens, and then put it into the mold. The material of the first plate is a continuous carbon fiber-reinforced nylon composite material.

[0118] After heating the second plate to 240 °C for softening, it is placed in a mold, and the second plate is located on the first plate. Among them, the material of the second plate is a continuous carbon fiber reinforced nylon composite material. The second plate can be formed by ply design (0° / 90°).

[0119] Put the discontinuous carbon fiber reinforced nylon composite material into an injection molding machine and preheat it to 260 °C. Among them, the injection molding machine and the molding press use the same mold.

[0120] The molding press closes the mold to mold the first plate and the second plate, so that the first plate forms the cladding plate 30 and the second plate forms the core plate 20. At this time, the flange 31 of the cladding plate 30 covers the side of the core plate 20. At the same time, the injection molding machine injects the preheated discontinuous carbon fiber reinforced nylon composite material into the mold to form the scraper body 40 on the core plate 20 and the cladding plate 30, completing the integrated molding of molding and injection molding of the composite material scraper 10.

[0121] After cooling, demold and take out the composite material scraper 10.

[0122] Perform a simulation deflection test on the composite material scraper 10 in this embodiment. For the scraper adapted to a groove width of 1250 mm, apply a test span of 1154 mm and a load with a strength rating of 680 kN according to industry standards. It is obtained that the deflection deformation amount of the composite material scraper 10 is less than 20 mm, meeting the requirement that the deflection deformation amount of the relevant specification scraper required by industry standards is less than the standard value of 25 mm. And the maximum stress concentration is obtained as 1455 MPa, and the maximum stress concentration is less than the minimum value of the allowable tensile strength of the composite material, which is 3500 MPa. It shows that the composite material scraper 10 in this embodiment meets the use requirements.

[0123] Embodiment 2

[0124] Compared with Embodiment 1, the structure and preparation method of the composite material scraper 10 are basically the same, and the following differences exist:

[0125] Both the core plate 20 and the cladding plate 30 are made of continuous basalt fiber reinforced PP (polypropylene) composite materials. The scraper body 40 is made of discontinuous basalt fiber reinforced PP (polypropylene) composite materials.

[0126] In the preparation method, after heating the first plate to 200 °C for softening, it is placed in a mold. The material of the first plate is a continuous basalt fiber reinforced PP (polypropylene) composite material.

[0127] After heating the second plate to 200 °C for softening, it is placed in a mold. The material of the second plate is a continuous basalt fiber reinforced PP (polypropylene) composite material.

[0128] Put the discontinuous basalt fiber reinforced PP (polypropylene) composite material into an injection molding machine and preheat it to 220 °C.

[0129] The composite material scraper 10 in this embodiment is subjected to a simulation deflection test. The deflection deformation amount and the maximum stress concentration of the composite material scraper 10 both meet the usage requirements.

[0130] Example 3

[0131] Compared with Example 1, the structure and preparation method of the composite material scraper 10 are basically the same, and the following differences exist:

[0132] Both the core plate 20 and the cladding plate 30 are made of continuous carbon fiber-reinforced PEEK (polyether ether ketone) composite material. The scraper body 40 is made of discontinuous carbon fiber-reinforced PEEK (polyether ether ketone) composite material.

[0133] In the preparation method, after heating the first plate to 400 °C to soften it, it is placed into a mold. The material of the first plate is continuous carbon fiber-reinforced PEEK (polyether ether ketone) composite material.

[0134] After heating the second plate to 400 °C to soften it, it is placed into a mold. The material of the second plate is continuous carbon fiber-reinforced PEEK (polyether ether ketone) composite material.

[0135] The discontinuous carbon fiber-reinforced PEEK (polyether ether ketone) composite material is placed into an injection molding machine and preheated to 400 °C.

[0136] The composite material scraper 10 in this embodiment is subjected to a simulation deflection test. The deflection deformation amount and the maximum stress concentration of the composite material scraper 10 both meet the usage requirements.

[0137] Example 4

[0138] Compared with Example 1, the structure and preparation method of the composite material scraper 10 are basically the same, and the following differences exist:

[0139] Both the core plate 20 and the cladding plate 30 are made of continuous glass fiber-reinforced polycarbonate composite material. The scraper body 40 is made of discontinuous glass fiber-reinforced polycarbonate composite material.

[0140] In the preparation method, after heating the first plate to 300 °C to soften it, it is placed into a mold. The material of the first plate is continuous glass fiber-reinforced polycarbonate composite material.

[0141] After heating the second plate to 300 °C to soften it, it is placed into a mold. The material of the second plate is continuous glass fiber-reinforced polycarbonate composite material.

[0142] The discontinuous glass fiber-reinforced polycarbonate composite material is placed into an injection molding machine and preheated to 300 °C.

[0143] The composite material scraper 10 in this embodiment is subjected to a simulation deflection test. It is obtained that both the deflection deformation amount and the maximum stress concentration of the composite material scraper 10 meet the usage requirements.

[0144] The above are only the preferred embodiments of the present application, and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included within the protection scope of the present application. The above is only the preferred implementation manner of the present application. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present application, several improvements and variations can be made, and these improvements and variations should also be regarded as within the protection scope of the present application.

Claims

1. A composite scraper, characterized in that: include: Core board; A cladding plate is arranged on one side of the core plate, wherein the material of the core plate and the material of the cladding plate include a continuous fiber reinforced resin composite material; The scraper body is arranged on a side of the core plate away from the cladding plate, and the material of the scraper body includes a discontinuous fiber reinforced resin composite material.

2. The composite scraper according to claim 1, characterized in that: Also includes: A first boss is disposed on the scraper body and protrudes in a direction away from the core plate; A first groove is provided at the first boss of the scraper body, and a notch of the first groove faces the core plate; The second boss is arranged on the core plate and corresponds to the first groove, and the second boss is embedded in the first groove.

3. The composite scraper according to claim 2, characterized in that: Also includes: The second groove is arranged on the scraper body and is adjacent to the first boss.

4. The composite scraper according to any one of claims 1 to 3, characterized in that: The cladding plate comprises: A flange covers a side surface of the core plate.

5. The composite scraper according to any one of claims 1 to 3, characterized in that: The continuous fiber reinforced resin composite material comprises continuous fibers and a resin matrix; The discontinuous fiber reinforced resin composite material comprises discontinuous fibers and a resin matrix; Wherein, the length of the discontinuous fibers is smaller than the length of the scraper body.

6. The composite scraper according to claim 5, characterized in that: The length of the discontinuous fibers is 1 mm to 50 mm.

7. The composite scraper according to claim 5, characterized in that: The resin matrix includes one or more of polyamide, polyethylene, polypropylene, polyurethane, polytetrafluoroethylene, polyoxymethylene, polycarbonate, polyphenylene sulfide, and polyaryletherketone; Wherein, the resin matrix of the continuous fiber reinforced resin composite material is the same as the resin matrix of the discontinuous fiber reinforced resin composite material.

8. The composite scraper according to any one of claims 1 to 3, characterized in that: The core plate, the cladding plate and the scraper body are formed in an integrated manner by compression molding.

9. A scraper conveyor, characterized in that: include: Chain; The composite scraper according to any one of claims 1 to 8, mounted on the chain.

10. A method for preparing a composite material scraper, used for preparing the composite material scraper according to any one of claims 1 to 8, characterized in that: The preparation method comprises the following steps: Heat the first sheet until it softens and then put it into the mold; Heat the second plate until it softens and then put it into the mold, wherein the second plate is located on the first plate; The discontinuous fiber reinforced resin composite material is placed in an injection molding machine for preheating; The first plate and the second plate are molded so that the first plate forms a cladding plate and the second plate forms a core plate; at the same time, the injection molding machine injects the preheated discontinuous fiber reinforced resin composite material into the mold to form a scraper body on the core plate and the cladding plate; Wherein, the material of the first plate material and the material of the second plate material include continuous fiber reinforced resin composite materials.

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