EPS mandrel

Abstract

The embodiment of the utility model provides an EPS mandrel. The EPS mandrel comprises an upper EPS mandrel body and a lower EPS mandrel body. The upper EPS mandrel is provided with a plurality of first air exhaust through holes in the first direction, and the bottom face of the upper EPS mandrel is provided with a first groove in the second direction. The lower EPS core shaft is fixed to the bottom face of the upper EPS core shaft, a plurality of second air exhaust through holes in the first direction are formed in the lower EPS core shaft, and a second groove is formed in the top face of the lower EPS core shaft; the first groove and the second groove are matched to form a through air exhaust channel, and the plurality of first air exhaust through holes and the plurality of second air exhaust through holes are communicated with the air exhaust channel; wherein the upper EPS core shaft and the lower EPS core shaft form an EPS core shaft main body, and the outer surface of the EPS core shaft main body is wrapped with a protective layer; the air exhaust channel, the first air exhaust through hole and the second air exhaust through hole are used for forming a vacuum channel. According to the technical scheme, the protection layer (such as a latex layer) can be tightly attached to the outer surface of the EPS mandrel body.

Description

Technical Field

[0001] The present application relates to the technical field of composite bag compression molding, and in particular to an EPS core shaft. Background Art

[0002] With the continuous development of composite material technology, especially in the composite material bagging molding process, the EPS latex core shaft, as an important structure, has a crucial impact on the molding quality of the final product through its manufacturing process. The EPS core shaft needs to be dipped in glue during the manufacturing process of the EPS latex core shaft. However, due to the high elasticity of the latex after curing, it will directly separate from the EPS core shaft in some complex-shaped areas (such as boss corners), forming an overhead area, in which the EPS core shaft and latex are separated.

[0003] It should be noted that the above content is not necessarily prior art, nor is it intended to limit the scope of patent protection of this application. Utility Model Content

[0004] The embodiments of the present application provide an EPS core shaft to solve or alleviate one or more of the technical problems mentioned above.

[0005] As one aspect of an embodiment of the present application, an EPS core shaft is provided in an embodiment of the present application, including:

[0006] An upper EPS core shaft, wherein the upper EPS core shaft is provided with a plurality of first air extraction holes along a first direction, and a bottom surface of the upper EPS core shaft is provided with a first groove along a second direction; the first air extraction holes penetrate through the top surface of the upper EPS core shaft;

[0007] A lower EPS core shaft, wherein the lower EPS core shaft is fixed to the bottom surface of the upper EPS core shaft, the lower EPS core shaft is provided with a plurality of second air extraction holes along the first direction, and the top surface of the lower EPS core shaft is provided with a second groove; the second air extraction holes penetrate the bottom surface of the lower EPS core shaft; the first groove and the second groove cooperate to form a through air extraction channel, and the plurality of first air extraction holes and the plurality of second air extraction holes are all in communication with the air extraction channel;

[0008] Wherein, the upper EPS core shaft and the lower EPS core shaft constitute an EPS core shaft body, and the outer surface of the EPS core shaft body is wrapped with a protective layer;

[0009] The exhaust channel, the first exhaust hole and the second exhaust hole are used to form a vacuum channel to extract the air between the protective layer and the EPS core shaft body, so that the protective layer is closely attached to the surface of the EPS core shaft body.

[0010] Optionally, the protective layer is made of latex material.

[0011] Optionally, the EPS mandrel further includes a corner reinforcement layer;

[0012] The top surface of the upper EPS core shaft has a plurality of surfaces, and adjacent surfaces are bent to form corners, and the corner reinforcement layer is fixed to at least part of the corners of the upper EPS core shaft.

[0013] Optionally, the corner reinforcement layer is formed by stacking and fixing multiple layers of soft and breathable sheet materials.

[0014] Optionally, the sheet material is a synthetic fiber fabric with an area density of less than 100 gsm.

[0015] Optionally, the upper EPS core shaft and the lower EPS core shaft are respectively provided with a plurality of positioning holes in opposite positions, and the positioning holes include guide holes and longitudinal holes; wherein the guide holes are communicated with the air extraction channel, and the longitudinal holes are distributed on both sides of the upper EPS core shaft and the lower EPS core shaft;

[0016] The positioning hole is used to cooperate with the positioning pin to fix the upper EPS core shaft and the lower EPS core shaft together;

[0017] The positioning pin is a soft EPS positioning pin, and the material of the positioning pin is the same as the material of the EPS core shaft body.

[0018] Optionally, the plurality of first air extraction through holes and the plurality of second air extraction through holes are circumferentially distributed on the edge of the guide hole.

[0019] Optionally, a latex interlayer is provided between the lower EPS core shaft and the upper EPS core shaft, and the latex interlayer is provided with a hollow structure, and the latex interlayer does not contact the edge of the air suction channel.

[0020] Optionally, there is a gap between the edge of the hollow structure and the edge of the air extraction channel, and the gap ranges from 30 mm to 50 mm.

[0021] The above technical solution adopted in the embodiment of the present application may include the following advantages: by dividing the EPS core shaft into an upper EPS core shaft and a lower EPS core shaft. A first groove and a second groove are provided on opposite surfaces of the two EPS core shafts, respectively, which are opposite to each other. When the two EPS core shafts are fixed (bonded), the first groove and the second groove cooperate to form an exhaust channel. Both EPS core shafts are provided with a plurality of exhaust holes, which are connected to the exhaust channel. After the EPS core shaft is dipped in a protective layer (such as a latex layer), the vacuum machine is connected to the exhaust channel. The air between the protective layer and the surface of the EPS core shaft is extracted along the exhaust holes and the exhaust channel, so that the protective layer is tightly attached to the surface of the EPS core shaft, so that the air entrained area of ​​the protective layer and the EPS core shaft can also effectively and tightly fit the main surface of the EPS core shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0023] Figure 1 It is a schematic diagram of the structure of the EPS core shaft provided in an embodiment of the present application.

[0024] Figure 2 It is an exploded schematic diagram of the EPS core shaft provided in the embodiment of the present application.

[0025] Figure 3 It is a top view of the EPS core shaft provided in an embodiment of the present application.

[0026] Figure 4 Yes Yes Figure 3 Enlarged view of point I in the middle.

[0027] Figure 5 is along Figure 3 Cross-sectional view along line AA.

[0028] Figure 6 is along Figure 3 Cross-sectional view of line BB.

[0029] Description of reference numerals:

[0030] 1. Upper EPS core shaft; 11. First groove; 12. Positioning hole; 121. Guide hole; 122. Longitudinal hole; 13. First air extraction hole; 2. Lower EPS core shaft; 21. Second groove; 3. Positioning pin. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present application more clear, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0032] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0033] The following provides an explanation of the terms used in this application.

[0034] EPS mandrel: Mainly made of EPS foam, which is a thermoplastic material made of polystyrene with a composition of approximately 98% air and 2% polystyrene.

[0035] EPS latex mandrel: It is a special mandrel material, mainly composed of EPS (Expanded Polystyrene) and latex. EPS foam is the main part of the mandrel, and latex is coated on the surface of EPS foam.

[0036] To facilitate those skilled in the art to understand the technical solutions provided in the embodiments of the present application, the relevant technologies are described below:

[0037] The inventors have found that the current method of separating latex from EPS on the EPS core shaft is mainly vacuuming, which is only suitable for relatively small EPS latex airbag parts with smooth surfaces. When making a relatively large EPS latex core shaft with steep corners, the problem of the EPS latex core shaft being suspended at the steep corner cannot be solved by simply vacuuming the core shaft directly.

[0038] To this end, the embodiment of the present application provides an EPS mandrel technical solution. The present application effectively avoids the EPS latex mandrel from being suspended at steep corners, thereby ensuring the laying quality of the prepreg in the corner area of ​​the EPS mandrel, improving the molding quality of the product, and reducing scrap. See below for details.

[0039] Hereinafter, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. It should be noted that these exemplary embodiments can be implemented in many different forms and should not be construed as being limited to the embodiments described herein.

[0040] like Figures 1 to 6 As shown, the EPS core shaft may include: an upper EPS core shaft 1, a lower EPS core shaft 2, and a protective layer (such as latex).

[0041] The structures and matching relationships of the upper EPS core shaft 1 and the lower EPS core shaft 2 are introduced below.

[0042] The upper EPS core shaft 1 is provided with a plurality of Figure 6 The bottom surface of the upper EPS core shaft 1 is provided with a first air extraction hole 13 along the second direction ( Figure 6 The first groove 11 (in the direction of the middle arrow d). The first air extraction hole 13 passes through the top surface of the upper EPS core shaft 1.

[0043] The lower EPS core shaft 2 is fixed to the bottom surface of the upper EPS core shaft 1. The lower EPS core shaft 2 is provided with a plurality of second air extraction holes along the first direction. The top surface of the lower EPS core shaft 2 (the side close to the upper EPS core shaft 1) is provided with a second groove 21 corresponding to the first groove 11. The first groove 11 and the second groove 21 cooperate to form a through air extraction channel. The plurality of first air extraction holes 13 and the plurality of second air extraction holes are all connected to the air extraction channel.

[0044] The upper EPS core shaft 1 and the lower EPS core shaft 2 constitute the EPS core shaft body, and the outer surface of the EPS core shaft body is wrapped with a protective layer. The air extraction channel, the first air extraction hole 13 and the second air extraction hole are used to form a vacuum channel to extract the air between the protective layer and the EPS core shaft body, so that the protective layer is closely attached to the surface of the EPS core shaft body.

[0045] In this embodiment, the EPS core shaft is divided into an upper EPS core shaft 1 and a lower EPS core shaft 2. A first groove and a second groove are provided on opposite surfaces of the two EPS core shafts. When the two EPS core shafts are fixed (bonded), the first groove 11 and the second groove 12 cooperate to form an exhaust channel. Both EPS core shafts are provided with a plurality of exhaust holes, and the plurality of exhaust holes are connected to the exhaust channel. After the EPS core shaft is dipped in a protective layer (such as latex), the vacuum machine is connected to the exhaust channel. The air between the protective layer and the surface of the EPS core shaft is extracted along the exhaust holes and the exhaust channel, so that the protective layer is closely attached to the surface of the EPS core shaft, so that the air encapsulation area of ​​the protective layer and the EPS core shaft can also effectively and tightly fit the main surface of the EPS core shaft, thereby solving the problem that the latex cannot fit tightly to the core shaft surface due to the lack of an effective exhaust path for the air between the latex and the EPS core shaft.

[0046] The protective layer is made of latex material. In some embodiments, it can also be made of other materials.

[0047] In some embodiments, after the steep corner area of ​​the EPS mandrel is identified, the EPS mandrel is segmented based on this. In this embodiment, the EPS mandrel is divided into two parts: an upper EPS mandrel 1 and a lower EPS mandrel 2. Then, the upper EPS mandrel 1 and the lower EPS mandrel 2 are respectively provided with a first direction ( Figure 6 The first exhaust hole 13 and the second exhaust hole are respectively provided on the corresponding surfaces of the upper EPS core shaft 1 and the lower EPS core shaft 2 along the second direction ( Figure 6 The first groove 11 and the second groove 21 (in the direction of the arrow d in the middle). Subsequently, the two parts of the EPS core shaft are re-fixed together. The first groove 11 and the second groove 21 cooperate to form a through exhaust channel. The EPS core shaft body formed by the upper EPS core shaft 1 and the lower EPS core shaft 2 is placed in a dip tank filled with latex, so that the latex (protective layer) can cover (wrap) the surface of the EPS core shaft body, and after the latex is cured, the EPS core shaft body wrapped with the latex (protective layer) is obtained. When the latex (protective layer) is bonded to the surface of the EPS core shaft body, there may be a situation where the latex and the EPS core shaft body in some local areas fail to fully bond, forming an air-trapped area. At this time, the vacuum machine is connected to the exhaust channel set in the EPS core shaft. The vacuum machine extracts the air between the latex (protective layer) and the surface of the EPS core shaft body through the exhaust channel and the first exhaust hole 13 and the second exhaust hole, so that the latex (protective layer) can be tightly attached to the surface of the EPS core shaft body. This embodiment provides an effective exhaust passage to reduce the phenomenon of air gap between the latex (protective layer) and the EPS core shaft body.

[0048] In an optional embodiment, the EPS core shaft further includes a corner reinforcement layer. The top surface of the upper EPS core shaft 1 has a plurality of faces, adjacent faces are bent to form corners, and the corner reinforcement layer is fixed to at least part of the corners of the upper EPS core shaft.

[0049] As an exemplary embodiment, as shown in the figure, the upper EPS core shaft 1 is in the shape of a boss. The corner reinforcement layer is fixed at the boss corner of the upper EPS core shaft 1, thereby alleviating the phenomenon that the latex is easy to bounce at the boss corner of the EPS core shaft after the EPS core shaft is dipped in latex, and improving the molding quality of the product and reducing the scrap rate.

[0050] In an optional embodiment, the reinforcing layer is formed by stacking and fixing multiple layers of sheet materials with soft texture and breathability.

[0051] In some embodiments, a layer of liquid latex is applied between each layer of sheet material, so that the multiple layers of sheet material are tightly stacked and fixed together to form a corner reinforcement layer. Liquid latex can be first applied to the boss corner of the upper EPS core shaft 1. Before the latex is completely cured, the reinforcement layer is placed on the latex. In addition, there are other alternative solutions. For example, the reinforcement layer can also be fixed to the boss corner of the upper EPS core shaft 1 by small plastic nails.

[0052] In this embodiment, when the surface of the EPS mandrel body is dipped in latex, the corner reinforcement layer is bonded with the latex (protective layer) to form a local reinforcement area. The local reinforcement area reduces the possibility of the latex (protective layer) bouncing at the boss corner of the EPS mandrel body.

[0053] In an optional embodiment, the sheet material is specifically a synthetic fiber fabric with a surface density of less than 100gsm, and a net made of synthetic fibers. In some embodiments, the synthetic fiber fabric can be polyester fiber, nylon fiber, or can be determined according to actual needs.

[0054] In an optional embodiment, the upper EPS core shaft 1 and the lower EPS core shaft 2 are respectively provided with a plurality of relatively positioned positioning holes 12 and the first exhaust hole 13 of the lower EPS core shaft 2, and the positioning holes 12 and the first exhaust hole 13 of the lower EPS core shaft 2 include a guide hole 121 and a longitudinal hole 122; wherein, the guide hole 121 is connected to the exhaust channel, and the longitudinal holes 122 are distributed on both sides of the upper EPS core shaft 1 and the lower EPS core shaft 2.

[0055] The positioning hole 12 is used to cooperate with the positioning pin 3 to fix the upper EPS core shaft 1 and the lower EPS core shaft 2 together;

[0056] The positioning pin is a soft EPS positioning pin, and the material of the positioning pin is the same as the material of the EPS core shaft body.

[0057] Specifically, the positioning pin 3 is first dipped in liquid latex and then the upper EPS core shaft 1 and the lower EPS core shaft 2 are fixed together.

[0058] In an optional embodiment, the number of the guide holes 121 is three, and the number of the longitudinal holes 122 is eight. The number of the guide holes 121 and the longitudinal holes 122 can also be determined according to actual needs.

[0059] In an optional embodiment, the plurality of first air extraction through holes 13 and the plurality of second air extraction through holes are circumferentially distributed on the edge of the guide hole 121 .

[0060] In an optional embodiment, a latex interlayer is provided between the lower EPS core shaft 2 and the upper EPS core shaft 1, and the latex interlayer is provided with a hollow structure so that the latex interlayer does not contact the edge of the suction channel.

[0061] In an optional embodiment, there is a gap between the edge of the hollow structure and the edge of the air extraction channel, and the range of the gap is 30mm-50mm. Specifically, a silicone strip can be placed in the air extraction channel first and pulled out after the bonding is completed.

[0062] 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 application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0063] For the convenience of description, the orientation or position relationship indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, vertical, horizontal" and "top, bottom" is usually based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Therefore, the exemplary term "above..." can include both "above..." and "below..." orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here are interpreted accordingly.

[0064] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0065] Unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is lower in level than the second feature.

[0066] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. 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 the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0067] It should also be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when a specific feature, structure or characteristic is described in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of this application.

[0068] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0069] It should also be noted that the above are only preferred embodiments of the present application, and the patent protection scope of the present application is not limited thereto. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An EPS mandrel, characterized in that: include: An upper EPS core shaft, wherein the upper EPS core shaft is provided with a plurality of first air extraction holes along a first direction, and a bottom surface of the upper EPS core shaft is provided with a first groove along a second direction; the first air extraction holes penetrate through the top surface of the upper EPS core shaft; A lower EPS core shaft, wherein the lower EPS core shaft is fixed to the bottom surface of the upper EPS core shaft, the lower EPS core shaft is provided with a plurality of second air extraction holes along the first direction, and the top surface of the lower EPS core shaft is provided with a second groove; the second air extraction holes penetrate the bottom surface of the lower EPS core shaft; the first groove and the second groove cooperate to form a through air extraction channel, and the plurality of first air extraction holes and the plurality of second air extraction holes are all in communication with the air extraction channel; Wherein, the upper EPS core shaft and the lower EPS core shaft constitute an EPS core shaft body, and the outer surface of the EPS core shaft body is wrapped with a protective layer; The exhaust channel, the first exhaust hole and the second exhaust hole are used to form a vacuum channel to extract the air between the protective layer and the EPS core shaft body, so that the protective layer is closely attached to the surface of the EPS core shaft body.

2. The EPS core shaft according to claim 1, characterized in that: It also includes a corner reinforcement layer; The top surface of the upper EPS core shaft has a plurality of surfaces, and adjacent surfaces are bent to form corners, and the corner reinforcement layer is fixed to at least part of the corners of the upper EPS core shaft.

3. The EPS core shaft according to claim 2, characterized in that: The corner reinforcement layer is formed by stacking and fixing multiple layers of soft and breathable sheet materials.

4. The EPS core shaft according to claim 3, characterized in that: The sheet material is a synthetic fiber fabric with an area density of less than 100 gsm.

5. The EPS core shaft according to claim 1, characterized in that: The upper EPS core shaft and the lower EPS core shaft are respectively provided with a plurality of positioning holes in opposite positions, and the positioning holes include guide holes and longitudinal holes; wherein the guide holes are communicated with the air extraction channel, and the longitudinal holes are distributed on both sides of the upper EPS core shaft and the lower EPS core shaft; The positioning hole is used to cooperate with the positioning pin to fix the upper EPS core shaft and the lower EPS core shaft together; The positioning pin is a soft EPS positioning pin, and the material of the positioning pin is the same as the material of the EPS core shaft body.

6. The EPS core shaft according to claim 5, characterized in that: The plurality of first air pumping through holes and the plurality of second air pumping through holes are circumferentially distributed on the edge of the guide hole.

7. The EPS core shaft according to claim 1, characterized in that: A latex interlayer is provided between the lower EPS core shaft and the upper EPS core shaft. The latex interlayer is provided with a hollow structure, and the latex interlayer does not contact the edge of the air suction channel.

8. The EPS core shaft according to claim 7, characterized in that: There is a gap between the edge of the hollow structure and the edge of the air extraction channel, and the range of the gap is 30 mm-50 mm.

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