Recyclable apron board made of thermoplastic composite material and processing technology of recyclable apron board

Abstract

The invention discloses a thermoplastic composite material recoverable apron board and a processing technology thereof, solves the problems that the apron board in the prior art is large in mass, and the position of a metal connecting piece is inconvenient to adjust, and has the advantages of controlling the quality of the apron board and improving the production efficiency. According to the technical scheme, the recyclable apron board made of the thermoplastic composite material has the beneficial effects that the structural strength of the apron board is guaranteed, rapid machining of the apron board is facilitated, and the position of a built-in connecting piece can be conveniently adjusted when the apron board is connected with a vehicle body. The built-in connecting piece is placed at the set position of the inner side of the outer skin, the protective cover penetrates through the built-in connecting piece, the outer skin and the protective cover are connected through ultrasonic welding, the inner skin and the outer skin are oppositely arranged, the inner skin is provided with a notch corresponding to the protective cover in position, and the outer skin and the clamping piece are connected through ultrasonic welding. The contact area of the inner skin and the outer skin and the contact area of the inner skin and the clamping piece are connected through ultrasonic welding.

Description

Technical Field

[0001] The invention relates to the field of skirt board structures, in particular to a recyclable skirt board made of thermoplastic composite material and a processing technology thereof. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] High-speed trains are equipped with skirt panels on their sides, placing increasingly stringent demands on these key components. These requirements not only include higher structural strength and rigidity to ensure safety and stability, but also emphasize the importance of lightweight design to increase operating efficiency, reduce energy consumption, and improve overall performance.

[0004] Traditional skirt panel manufacturing methods usually rely on metal or other materials that are complex to process, resulting in heavier weight and higher manufacturing costs. Gluing or mechanical connection are often used for assembly. Gluing has the problems of poor environmental friendliness and low assembly efficiency, and workers need to press during operation, making it difficult to ensure flatness. Mechanical connections are mainly made through bolts and other methods, which require drilling holes in the skirt panels, reducing their structural strength. Although bolt connection is fast, because the entire vehicle has to travel at high speeds, bolt connection requires maintenance, which takes a short time and invisibly increases the weight of the skirt panels.

[0005] In addition, because the skirt panel is usually provided with a connector to connect to the vehicle body, the position of the connector may need to be adjusted due to other reasons such as vehicle body manufacturing tolerances. However, because the connector is bolted, re-drilling is required to adjust the position, further reducing the structural strength. If the connector is fixed by welding, it is difficult to remove it due to the material limitations of the skirt panel. In other words, the structure and manufacturing process of the existing skirt panel are difficult to flexibly cope with the adjustment of the connector position, which often leads to high modification costs and long modification time.

[0006] To replace stainless steel, thermosetting composite materials are used in the prior art to manufacture skirt panels. The current molding process of the thermosetting composite sandwich structure requires a certain amount of time for curing, resulting in a relatively long curing time, which limits the production speed and increases the manufacturing time. There is also the problem of difficulty in reprocessing: once the curing is completed, the thermosetting material is difficult to be heated and reshaped again, which makes repair and recycling difficult; there is also the problem of high initial investment: for some complex molding processes (such as RTM, vacuum introduction, etc.), it may be necessary to invest in expensive equipment and molds; another problem is that the one-piece molding has a high temperature requirement of up to 200°C, and the foam in the inner core cannot withstand this temperature. For this reason, other ring beam structures need to be set on the outside of the foam to prevent the foam from being intolerant to high temperatures, but this increases the weight of the skirt panel.

[0007] In summary, existing skirt panels have the problems of being heavy, difficult to recycle, having high manufacturing costs, and being unable to adjust the position of the connectors connected to the vehicle body. Summary of the Invention

[0008] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a recyclable skirt board made of thermoplastic composite material, which effectively controls the weight of the skirt board and facilitates molding and processing.

[0009] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0010] A recyclable skirt made of thermoplastic composite material includes an inner skin. The inner skin and outer skin are formed separately. The outer skin is made of thermoplastic composite material. A built-in connector is placed at a set position inside the outer skin. A protective cover is set through the built-in connector. The outer skin and the protective cover are connected by ultrasonic welding. The inner skin and the outer skin are arranged opposite to each other. The outer skin and the clamping piece are connected by ultrasonic welding. The area where the inner skin contacts the outer skin and the area where the inner skin contacts the clamping piece are both connected by ultrasonic welding.

[0011] As described above, for a thermoplastic composite recyclable skirt, when the position of the built-in connector needs to be adjusted, the position of the protective cover on the outer skin is partially melted and then the position of the built-in connector is readjusted. After the adjustment is completed, the outer skin and the protective cover are welded.

[0012] In the thermoplastic composite recyclable skirt panel as described above, the inner skin is also made of thermoplastic composite material, and the clamping piece is foam.

[0013] As described above, the thermoplastic composite recyclable skirt, the welding area between the inner skin and the clamping piece forms an inner ring, the welding area between the inner skin and the outer skin forms an outer ring, and the welding area between the outer skin and the clamping piece also forms an inner ring.

[0014] In the thermoplastic composite recyclable skirt as described above, a plurality of built-in connectors are provided, and the built-in connectors are arranged on the upper side, the middle section and the bottom side of the outer skin.

[0015] The thermoplastic composite recyclable skirt panel as described above, wherein the protective cover is rectangular in shape, a recess is provided on the side of the protective cover facing the outer skin to accommodate the head of the built-in connector, the built-in connector is provided through the protective cover to connect with the external connector, and the clamping member is provided away from the protective cover;

[0016] The built-in connector is a bolt, the screw part of the bolt is set through the protective cover, and a nut is set on the part of the bolt that passes through the protective cover. The protective cover supports the built-in connector. The protective cover serves as the middle connector connecting the built-in connector and the outer skin to ensure the stable setting of the built-in connector. When the position of the built-in connector needs to be adjusted, the connection between the outer skin and the protective cover can be partially melted.

[0017] In the thermoplastic composite recyclable skirt as described above, the location of the protective cover is determined according to the location of the built-in connector.

[0018] In a second aspect, the present invention further discloses a processing technology for a recyclable thermoplastic composite skirt, comprising the following contents:

[0019] The inner skin and the outer skin are manufactured separately, the built-in connector is placed at a set position inside the outer skin, the protective cover is passed through the protective cover, and the protective cover is in contact with the outer skin;

[0020] The outer skin and protective cover are welded by ultrasonic method;

[0021] The outer skin and the clamping parts are welded by ultrasonic method;

[0022] An inner skin is arranged on a side of the clamping piece away from the outer skin, and the contact area between the inner skin and the clamping piece is welded by ultrasonic means;

[0023] The contact area between the inner skin and the outer skin is welded by ultrasonic means.

[0024] In the processing technology for the recyclable thermoplastic composite skirt as described above, the weld spacing between the inner skin or the outer skin and the clamping member is 0, and the width of a single weld is 30 to 100 mm.

[0025] In the processing technology of the thermoplastic composite recyclable skirt as described above, when welding the outer skin and the protective cover, the outer skin and the clamping piece, the inner skin and the outer skin, and the inner skin and the clamping piece, the welding temperature is between 270°C and 300°C.

[0026] The beneficial effects of the present invention are as follows:

[0027] 1) The outer skin of the present invention adopts thermoplastic composite material, which has good mechanical properties, weldability and recyclability, and is the basis for achieving overall structural optimization. In this way, the inner skin, outer skin, foam core material and protective cover are welded to form an integral structure with pre-embedded function. The whole structure does not adopt adhesive or bolt connection, and there are no complex annular beams and other structural parts around the clamping parts. In this way, the overall quality is effectively controlled and the skirt plate does not need to be regularly maintained. This integrated design not only improves the overall strength and rigidity of the structure, but also simplifies the assembly process. In addition, the main structural parts are connected by ultrasonic welding technology, ensuring that the lightweight design is achieved while maintaining the structural strength and rigidity. No complex equipment and molds are required, which is conducive to controlling production and manufacturing costs. Compared with traditional structures, this method significantly improves assembly efficiency and shortens the production cycle to minutes.

[0028] 2) In the present invention, the outer skin is made of thermoplastic composite material, and the built-in connector is installed on the inner side of the outer skin through a protective cover. The built-in connector is not directly connected to the outer skin. When the position of the built-in connector needs to be adjusted, the thermoplastic composite material can be partially melted to separate the protective cover from the outer skin, which facilitates the adjustment of the position of the built-in connector. Moreover, compared with traditional materials, the adjustment speed is faster, which greatly reduces the cost problem caused by structural adjustment.

[0029] 3) In the present invention, both the outer skin and the inner skin are made of thermoplastic composite materials. Thermoplastic composite materials have excellent mechanical properties (such as high strength and high rigidity), good processing performance (easy to form), and the fact that thermoplastic composite materials can be melted and reshaped, thereby achieving material recycling, reducing the consumption of natural resources, and lowering energy consumption.

[0030] 4) In the present invention, a protective cover is provided on the peripheral side of the built-in connector. The protective cover serves to connect the built-in connector with the outer skin, and can also ensure the stable setting of the built-in connector, making the entire skirt more compact and easy to maintain. When the position of the built-in connector needs to be adjusted, the connection between the outer skin and the protective cover can be partially melted, and the position of the built-in connector can be adjusted by moving the protective cover.

[0031] 5) In the present invention, the inner skin and the clamping part, the outer skin and the clamping part are all welded by ultrasonic welding. During the ultrasonic welding process, the surfaces of the inner skin and the clamping part, the outer skin and the clamping part rub against each other to form molecular fusion. The ultrasonic welding is only on the surface of the inner skin, the outer skin and the clamping part, not on the inside. In this way, even if the clamping part is foam, the surface melts to achieve connection, avoiding the problem of internal foam being unable to withstand high temperature. In this way, there is no need to complicate the clamping part, and a simple setting is sufficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0033] Figure 1 1 is a schematic diagram of the interior of a recyclable thermoplastic composite skirt according to one or more embodiments of the present invention.

[0034] Figure 2 This invention Figure 1 Schematic diagram of the AA section.

[0035] Figure 3 Schematic diagram of an inner ring and an outer ring formed by welding in a recyclable skirt made of thermoplastic composite material according to one or more embodiments of the present invention.

[0036] Figure 4 Schematic diagram of the location of a protective cover in a recyclable skirt made of a thermoplastic composite material according to one or more embodiments of the present invention.

[0037] Figure 5 1 is a front view of a protective cover in a recyclable thermoplastic composite skirt according to one or more embodiments of the present invention.

[0038] Figure 6 FIG. 1 is a rear view of a protective cover in a thermoplastic composite recyclable skirt according to one or more embodiments of the present invention.

[0039] In the figure: the distances or sizes between parts are exaggerated to show the positions of various parts, and the schematic diagram is for reference only.

[0040] Among them: 1. External connector, 2. Outer skin, 3. Inner skin, 4. Internal connector, 5. Clamping piece, 6. Protective cover, 7. Inner ring, 8. Outer ring, 9. Recess, 10. Opening. DETAILED DESCRIPTION

[0041] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0042] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise clearly indicated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "comprising" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations;

[0043] As introduced in the background technology, the existing technology has the problem that the skirt board is heavy and it is inconvenient to adjust the position of the metal connector. In order to solve the above technical problems, the present invention proposes a recyclable skirt board made of thermoplastic composite material.

[0044] Example 1

[0045] In a typical embodiment of the present invention, referring to Figure 1 and Figure 2 As shown, a thermoplastic composite recyclable skirt includes an inner skin 3, the inner skin 3 and the outer skin 2 are formed separately, the outer skin 2 is made of thermoplastic composite material, the built-in connector 4 is placed at a set position on the inner side of the outer skin 2, a protective cover 6 is set through the built-in connector 4, the outer skin 2 and the protective cover 6 are connected by ultrasonic welding, the inner skin 3 and the outer skin 2 are arranged opposite to each other, the clamping member 5 is arranged to avoid the protective cover 6, so that the built-in connector 4 can be arranged beyond the inner skin 3, the inner skin 3 is provided with a notch so that the protective cover 6 is exposed from the notch, the outer skin 2 and the clamping member 5 are connected by ultrasonic welding, the contact area between the inner skin 3 and the outer skin 2 and the contact area between the inner skin 3 and the clamping member 5 are connected by ultrasonic welding, no gluing or bolting is used for the whole, and there is no complex annular beam or other structural parts around the clamping member 5, so that the overall quality is effectively controlled, processing and manufacturing are convenient, and there is no need for regular maintenance of the skirt.

[0046] It should be noted that the inner skin 3 is also made of thermoplastic composite material, and the clamping part 5 is PET (the main component is polyethylene terephthalate) foam. The foam plays a vibration reduction role, and at the same time plays a certain supporting role for the inner skin 3 and the outer skin 2, effectively ensuring the structural strength of the skirt. The outer skin 2 is made of thermoplastic composite material. The material has good mechanical properties, weldability and recyclability, and is the basis for achieving overall structural optimization. In this way, the inner skin 3, the outer skin 2, the foam and the protective cover 6 are welded to form an integral structure with a pre-embedded function.

[0047] In addition, the outer skin 2 and the inner skin 3 are both made of thermoplastic composite materials, specifically carbon fiber composite materials. By utilizing the characteristics of thermoplastic composite materials that can be melted and reshaped, the recycling of materials is achieved, the consumption of natural resources is reduced, and energy consumption is reduced, which is conducive to the recycling of resources, the reduction of energy consumption, and the promotion of green manufacturing and sustainable development.

[0048] It needs to be explained that the inner skin 3 is rectangular, and each corner of the inner skin 3 is set with an arc transition. The outer skin 2 is also rectangular, and the side of the outer skin 2 is bent to be welded to the inner skin 3.

[0049] It is easy to understand that there are multiple built-in connectors 4, and the setting of the built-in connectors 4 can realize the hanging and telescopic connection between the skirt panel and the vehicle body. The built-in connectors 4 are arranged on the upper side, middle section and bottom side of the outer skin 2. Two built-in connectors 4 are arranged on the upper side of the outer skin 2, and another two built-in connectors 4 are arranged at the upper middle section of the outer skin 2. The distance between the two built-in connectors 4 at the upper middle section is greater than the distance between the two built-in connectors 4 at the upper side. The built-in connector 4 at the upper middle section is used to set a telescopic cylinder, and the connection between the skirt panel and the vehicle body is realized through the telescopic cylinder. Two built-in connectors 4 are also arranged on the bottom side of the outer skin, and each row of adjacent built-in connectors 4 are set at a distance.

[0050] It is easy to understand that reference Figure 5 and Figure 6 As shown, the protective cover 6 is rectangular in shape, and is provided with an opening 10 for the bolt to pass through. The protective cover 10 may be provided with multiple openings. A recess 9 is provided on the side of the protective cover 6 facing the outer skin to accommodate the head of the built-in connector 4. The depth of the recess 9 is consistent with the height of the bolt head, so that the bolt head can be fitted with the inner surface of the outer skin 2. The bolt head can be trapezoidal to ensure the contact area with the outer skin 2. The built-in connector 4 is provided through the protective cover 6 to be connected to the external connector 1 such as a telescopic cylinder or other connectors.

[0051] In addition, the distance between the clamping member 5 and the protective cover 6 is set so that even after the position of the protective cover 6 is adjusted, the clamping member 5 does not need to be replaced; in some examples, the clamping member 5 needs to be replaced after the position of the protective cover 6 is adjusted;

[0052] It should be noted that the location of the protective cover 6 is determined by the location of the built-in connector 4 , and the location of the built-in connector 4 is determined by the location of the external connector 1 , which is the structural component connecting the skirt panel to the vehicle body.

[0053] In this embodiment, the built-in connector 4 is a bolt, the screw portion of the bolt is set through the protective cover 6, the bolt head is in contact with the inner side of the outer skin 2, and a nut is set on the portion of the bolt passing through the protective cover 6. The protective cover 6 supports the built-in connector 4. The protective cover 6 serves as the middle connector connecting the built-in connector and the outer skin, ensuring the stable setting of the built-in connector 4. When the position of the built-in connector 4 needs to be adjusted, the connection between the outer skin 2 and the protective cover 6 can be partially melted, and the position of the built-in connector can be adjusted by moving the protective cover 6. After the adjustment is completed, the outer skin 2 and the protective cover 6 can be welded, which greatly reduces the cost caused by structural changes, thereby reducing material waste and facilitating installation and disassembly maintenance.

[0054] refer to Figure 3As shown, the welding area between the inner skin 3 and the clamping part 5 forms an inner ring 7 (the inner ring is in the blue frame), the welding area between the inner skin and the outer skin forms an outer ring 8 (the outer ring is in the red frame), and the welding area between the outer skin and the clamping part also forms an inner ring 7. The inner skin 3 and the outer skin 2 are both rectangular structural parts. The inner ring 7 and the outer ring 8 formed by natural welding are both rectangular, and the outer ring 8 is placed on the outside of the inner ring 7.

[0055] The recyclable skirt provided in this embodiment is formed into an integrated structure by ultrasonic welding. Compared with the existing press-fit integrated molding method, the overall quality is effectively controlled, and there is no need to consider the high temperature intolerance of the internal clamping parts, and no complex mold is required. The integrated design not only improves the overall strength and rigidity of the structure, but also simplifies the assembly process. The main structural parts are connected by ultrasonic welding technology, and the thermoplastic sandwich structure ensures the overall high strength and high rigidity. Compared with the traditional original composite structure skirt sandwich structure, the difficulty of molding preparation is reduced, the manufacturing process is simpler, the production preparation time and complexity are reduced, and the production speed is accelerated while reducing the manufacturing cost and improving the economic benefits.

[0056] Example 2

[0057] This embodiment discloses a processing technology for a recyclable skirt board made of thermoplastic composite material, including the following contents:

[0058] The inner skin 3 and the outer skin 2 are manufactured separately, the built-in connector 4 is placed at a set position inside the outer skin 2, and the protective cover 6 is set through the protective cover 6, and the protective cover 6 is in contact with the outer skin 2;

[0059] The outer skin 2 and the protective cover 6 are welded by ultrasonic method;

[0060] The outer skin 2 and the clamping member 5 are welded by ultrasonic welding;

[0061] Place the inner skin 3 on the side of the clamp 5 away from the outer skin 2, and weld the contact area between the inner skin 3 and the clamp 5 by ultrasonic welding;

[0062] The contact area between the inner skin 3 and the outer skin 2 is welded by ultrasonic means.

[0063] Among them, ultrasonic welding can firmly connect multiple layers of materials together without the use of additional adhesives, and can adapt to complex three-dimensional shapes, while the existing one-piece compression molding may require a more complex mold design to achieve the same effect. The inner skin 3, outer skin 2 and clamping part 5 are formed separately and then welded, which is more suitable for the form of an automated production line in the later stage.

[0064] It should be noted that the weld spacing between the inner skin 3 or the outer skin 2 and the clamping member 5 is 0, and the width of a single weld is 30 to 100 mm.

[0065] When welding the outer skin 2 and the protective cover 6, the outer skin 2 and the clamping piece 5, the inner skin 3 and the outer skin 2, and the inner skin 3 and the clamping piece 5, the welding temperature is between 270°C and 300°C, the welding pressure is 0.5-1.5MPa, and the amplitude is 30-50 microns.

[0066] The processing technology provided in this embodiment and the multi-process combined molding solve the problems of low laying efficiency, high production cost and poor connection strength of the original process. When the position of the built-in connector 4 needs to be changed, the protective cover 6 can be partially melted, and the position of the built-in connector can be adjusted by changing the position of the protective cover 6. After adjustment, re-welding is performed, thereby reducing material waste and facilitating installation and disassembly maintenance.

[0067] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A thermoplastic composite recyclable skirt, characterized in that: The utility model comprises an inner skin, wherein the inner skin and the outer skin are formed separately, the outer skin adopts a thermoplastic composite material, the built-in connector is placed at a set position on the inner side of the outer skin, a protective cover is set through the built-in connector, the outer skin and the protective cover are connected by ultrasonic welding, the inner skin and the outer skin are arranged opposite to each other, the clamping part is arranged to avoid the protective cover, the inner skin is provided with a notch corresponding to the position of the protective cover, the outer skin and the clamping part are connected by ultrasonic welding, and the contact area between the inner skin and the outer skin and the contact area between the inner skin and the clamping part are connected by ultrasonic welding.

2. The recyclable thermoplastic composite skirt according to claim 1, characterized in that: When the position of the built-in connector needs to be adjusted, the position of the protective cover on the outer skin is partially melted and then the position of the built-in connector is readjusted. After the adjustment is completed, the outer skin and the protective cover are welded.

3. The recyclable thermoplastic composite skirt according to claim 1, characterized in that: The inner skin is also made of thermoplastic composite material, and the clamping piece is foam.

4. The recyclable thermoplastic composite skirt according to claim 1, characterized in that: The welding area between the inner skin and the clamping piece forms an inner ring, the welding area between the inner skin and the outer skin forms an outer ring, and the welding area between the outer skin and the clamping piece also forms an inner ring.

5. The recyclable thermoplastic composite skirt according to claim 1, characterized in that: There are multiple built-in connectors, which are arranged on the upper side, middle section and bottom side of the outer skin.

6. The recyclable thermoplastic composite skirt according to claim 1, characterized in that: The protective cover is rectangular in shape, and a recess is provided on one side of the protective cover facing the outer skin to accommodate the head of the built-in connector. The built-in connector is provided through the protective cover to connect with the external connector, and the clamping member is provided away from the protective cover. The built-in connecting piece is a bolt, the screw rod portion of the bolt is arranged through the protective cover, and a nut is arranged on the portion of the bolt that passes through the protective cover.

7. The recyclable thermoplastic composite skirt according to claim 6, characterized in that: The setting position of the protective cover is determined according to the setting of the built-in connector, and the position of the built-in connector is determined according to the position of the external connector.

8. A process for processing a recyclable skirt board made of thermoplastic composite material, characterized in that: Includes the following: The inner skin and the outer skin are manufactured separately, the built-in connector is placed at a set position inside the outer skin, the protective cover is passed through the protective cover, and the protective cover is in contact with the outer skin; The outer skin and protective cover are welded by ultrasonic method; The outer skin and the clamping parts are welded by ultrasonic method; An inner skin is arranged on a side of the clamping piece away from the outer skin, and the contact area between the inner skin and the clamping piece is welded by ultrasonic means; The contact area between the inner skin and the outer skin is welded by ultrasonic means.

9. The processing technology of the recyclable thermoplastic composite skirt according to claim 8, characterized in that: The weld spacing between the inner skin or the outer skin and the clamping member is 0, and the width of a single weld is 30 to 100 mm.

10. The processing technology of the recyclable thermoplastic composite skirt according to claim 8, characterized in that: When welding the outer skin and the protective cover, the outer skin and the clamping piece, the inner skin and the outer skin, and the inner skin and the clamping piece, the welding temperature is between 270°C and 300°C.

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