Hard polyurethane sandwich panel with metal surface

Abstract

The embodiment of the utility model provides a metal surface hard polyurethane sandwich panel which comprises a metal outer layer panel used for providing external protection, the inner surface of the metal outer layer panel is provided with crossed textures to increase friction force, and the crossed textures are composed of multiple sets of micro grooves and protruding ribs to improve interlayer bonding strength; the hard polyurethane core material is located between the metal outer layer panels and used for heat preservation and supporting, sawtooth cavities are formed in the top and the bottom of the hard polyurethane core material, and the sawtooth cavities are matched with the crossed textures to reduce the slippage tendency between the contact surfaces; the frame reinforcer is arranged around the edge of the hard polyurethane core material and is used for improving the impact resistance; and the anchoring ribs are embedded into the hard polyurethane core material and are connected with the metal outer-layer panel. Through the scheme of the embodiment of the invention, the influence of interlayer slippage on rigidity can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sandwich panels, in particular to a metal-faced rigid polyurethane sandwich panel. BACKGROUND

[0002] Metal-faced rigid polyurethane sandwich panels are building and industrial panels composed of a metal face sheet and a rigid polyurethane foam core bonded or otherwise combined together. They are widely used due to their excellent thermal insulation properties, lightweight and high-strength characteristics, and convenient installation process. However, in practical applications, these sandwich panels may have interlayer slippage problems, i.e., due to differences in material properties and stress conditions between the metal face sheet and the internal rigid polyurethane core, relative displacement occurs, which significantly reduces the overall structural stiffness, thereby affecting the load-carrying capacity and service life. Therefore, how to reduce the impact of interlayer slippage on stiffness has become an important technical challenge in the design and use of this material. SUMMARY

[0003] Therefore, the embodiments of the present disclosure provide a metal-faced rigid polyurethane sandwich panel to at least partially solve the problems in the prior art.

[0004] A metal-faced rigid polyurethane sandwich panel according to the present application comprises:

[0005] A metal outer panel for providing external protection, wherein the inner surface of the metal outer panel is provided with cross-texture to increase friction, and the cross-texture is composed of a plurality of groups of micro-grooves and raised ribs to improve interlayer bonding strength.

[0006] A rigid polyurethane core material located between the metal outer panels for thermal insulation and support, wherein the top and bottom of the rigid polyurethane core material are provided with sawtooth cavities, and the sawtooth cavities cooperate with the cross-texture to reduce the tendency of slippage between the contact surfaces.

[0007] A frame reinforcement around the edges of the rigid polyurethane core material for improving impact resistance.

[0008] An anchoring rib embedded in the rigid polyurethane core material and connected to the metal outer panel.

[0009] In a specific embodiment, the height of the raised ribs is between 0.3mm and 1mm, and the spacing is in the range of 2mm to 4mm to reduce the risk of interlayer slippage.

[0010] In a specific embodiment, the micro-grooves are of rectangular cross-section structure to reduce the impact of interlayer slippage on stiffness.

[0011] In a specific embodiment, the rigid polyurethane core material is provided with an embedded reinforcing mesh for dispersing internal shear stress.

[0012] In one embodiment, a rubber sealing pad is arranged inside the frame reinforcement to eliminate the influence of vibration on the sandwich panel structure.

[0013] In one embodiment, the surface of the anchoring rib is provided with multiple rows of staggered convex points to increase the surface area of the anchoring area.

[0014] In one embodiment, one end of the anchoring rib is inserted into a pre-formed slot in the metal outer panel, and the other end of the anchoring rib is inserted into the rigid polyurethane core material.

[0015] In one embodiment, the anchoring rib is filled with a high-strength adhesive layer at the joint with the rigid polyurethane core material.

[0016] The metal-faced rigid polyurethane sandwich panel provided by the embodiments of the present disclosure comprises: a metal outer panel for providing external protection, wherein the inner surface of the metal outer panel is provided with cross textures to increase friction, and the cross textures are composed of multiple groups of micro-grooves and raised ribs to improve interlayer bonding strength; a rigid polyurethane core material located between the metal outer panels for thermal insulation and support, the top and bottom of the rigid polyurethane core material are provided with sawtooth cavities, and the sawtooth cavities cooperate with the cross textures to reduce the sliding tendency between the contact surfaces; a frame reinforcement arranged around the edges of the rigid polyurethane core material for improving impact resistance; and an anchoring rib embedded in the rigid polyurethane core material and connected with the metal outer panel. Through the scheme of the embodiments of the present disclosure, the problem of how to reduce the influence of interlayer sliding on stiffness can be solved. BRIEF DESCRIPTION OF DRAWINGS

[0017] In the drawings, like reference numerals refer to like elements throughout the various drawings. The drawings are not necessarily to scale, the emphasis instead being placed upon illustrating principles of the application. It should be understood that the drawings are merely depictions of some embodiments of the application and that they should not be construed as limiting the scope of the application.

[0018] Figure 1 is a structural schematic diagram of the metal-faced rigid polyurethane sandwich panel according to the present disclosure;

[0019] Figure 2 is an exploded schematic diagram of the internal structure of the metal-faced rigid polyurethane sandwich panel according to the present disclosure;

[0020] Figure 3 is a schematic diagram of the metal-faced rigid polyurethane sandwich panel according to the present disclosure; Figure 2 is an enlarged view of position A in FIG. 4;

[0021] Figure 4It is the structural schematic view of the frame reinforcement of the metal-faced rigid polyurethane sandwich panel.

[0022] In the figure: 1, metal outer panel; 11, cross texture; 12, micro groove; 2, rigid polyurethane core material; 3, frame reinforcement; 4, anchoring rib; 5, raised rib; 6, embedded reinforcing mesh; 7, sawtooth cavity; 8, rubber sealing pad; 9, high-strength adhesive layer DETAILED DESCRIPTION

[0023] To make the purpose, technical scheme and advantages of the embodiments of the present disclosure clearer and more apparent, the embodiments of the present disclosure are further described in detail below with reference to the embodiments and drawings, and the schematic embodiments and their descriptions are only used to explain the embodiments of the present disclosure, and not as a limitation on the embodiments of the present disclosure.

[0024] As Figures 1-4 shown, the metal-faced rigid polyurethane sandwich panel of the present application includes a metal outer panel 1, a rigid polyurethane core material 2, a frame reinforcement 3 and an anchoring rib 4. These components realize excellent overall performance and performance through special structure and connection method.

[0025] The metal outer panel 1 is one of the important components of the sandwich panel, which is located on the outer two sides of the rigid polyurethane sandwich panel, mainly used for providing external protection and enhancing overall stiffness. The cross texture 11 is provided on the inner surface of the panel to increase the friction. The cross texture 11 is composed of a plurality of micro grooves 12 and raised ribs, which can be processed by stamping or rolling process. The thickness of the panel is precisely designed and optimized to reduce the occurrence of slip deformation as much as possible while ensuring the structural strength.

[0026] The rigid polyurethane core material 2 is arranged between the two metal outer panels 1, as the main component of the core insulation and support function. This core material has high strength and excellent thermal insulation performance, which is usually prepared by high-pressure foaming technology, and can be tightly bonded with the metal outer panel 1, so as to ensure the functional requirements of the whole sandwich panel.

[0027] The frame reinforcement 3 is arranged around the edge position of the rigid polyurethane core material 2, aiming to improve the edge stability and impact resistance of the whole sandwich panel. The reinforcement is usually made of high-strength materials such as aluminum profiles or steel profiles, and its cross section can be designed as L-shaped or C-shaped to better fit the edge of the sandwich panel. During installation, it is combined with the metal outer panel 1 and the rigid polyurethane core material 2 by mechanical fastening or gluing.

[0028] The anchoring rib 4 is embedded in the hard polyurethane core material 2 and connected with the metal outer panel 1 at the same time, playing a role in enhancing the overall integrity of the internal structure of the sandwich panel. These anchoring ribs 4 can be injected together when the core material is formed, or they can be separately pre-made and then inserted into the polyurethane through a high-temperature injection molding process. They can be in the form of T-shaped, cross-shaped, or other geometric shapes in order to more effectively disperse the force.

[0029] In solving the technical problem of how to reduce the impact of interlayer slip on stiffness, the present application optimizes the cross texture 11 on the inner surface of the metal outer panel 1 and the design of the anchoring rib 4 to improve the interlayer bonding strength, thereby effectively reducing the overall stiffness loss caused by slip. The micro-friction and larger surface area provided by the cross texture 11 significantly improve the bonding effect, while the design of the embedded anchoring rib 4 further enhances the force transmission and constraint between different layers, ultimately ensuring the stability and durability of the overall structural rigidity.

[0030] As shown in Figure 3 In one embodiment, the metal-faced hard polyurethane sandwich panel of the present application features a cross texture 11 designed on the inner surface of the metal outer panel 1. This texture includes a unique shape composed of convex ridges 5 and multiple groups of micro-grooves 12, and its geometric size is optimized to reduce the risk of interlayer slip. Specifically, the height of the convex ridges 5 is set to be between 0.3mm and 1mm, and the spacing is limited to within the range of 2mm to 4mm. This design not only improves the mechanical interlocking effect between the panel and the core material, but also effectively avoids the problem of structural instability caused by excessive slip.

[0031] For example, the cross texture 11 described above can be machined onto the inner surface of the metal outer panel 1 through a precision molding process. During the production stage, the pre-made panel is directly attached to the hard polyurethane core material 2 on both sides, and then firmly connected through a special adhesive or anchoring rib 4, ensuring that the assembly precision of each component meets the design requirements. Specifically, the frame reinforcement 3 surrounds the entire edge of the sandwich panel and, together with other components, forms a stable overall structure, ensuring that the overall performance meets the standards.

[0032] As shown in Figure 3 In one embodiment, the metal-faced hard polyurethane sandwich panel of the present application features a cross texture 11 designed on the inner surface of the metal outer panel 1. This texture includes a unique shape composed of convex ridges 5 and multiple groups of micro-grooves 12, and its geometric size is optimized to reduce the risk of interlayer slip. Specifically, the height of the convex ridges 5 is set to be between 0.3mm and 1mm, and the spacing is limited to within the range of 2mm to 4mm. This design not only improves the mechanical interlocking effect between the panel and the core material, but also effectively avoids the problem of structural instability caused by excessive slip.

[0033] For example, micro-grooves 12 with rectangular cross-sections can be manufactured by stamping or molding techniques and arranged on the inner surface of the metal outer panel 1. In actual production, these micro-grooves 12 can be distributed on the inner surface of the panel at regular intervals, specifically, the layout needs to take into account the bonding performance and manufacturing process requirements, while ensuring that the rigid polyurethane core material 2 can effectively fill and firmly adhere to the grooves. In this way, the panel and the core material can be tightly connected in the form of physical embedding, thereby improving the consistency of the overall mechanical properties.

[0034] As shown in Figure 2 and Figure 3 , in one embodiment, a rigid polyurethane core material 2 of a metal-faced rigid polyurethane sandwich panel of the present application is provided with an embedded reinforcing net 6. The reinforcing net is composed of a fiber woven layer or a multidirectional grid, which mainly functions to effectively disperse internal shear stress, thereby avoiding the occurrence of local slip or permanent deformation of the rigid polyurethane core material 2 under stress. The reinforcing net is located inside the rigid polyurethane core material 2 and maintains good bonding state with the overall structure of the sandwich panel, and is completely embedded in the internal area of the rigid polyurethane core material 2 through specific process means. The fiber material can be selected from high-strength and high-elasticity types to match the physical properties of the rigid polyurethane core material 2.

[0035] For example, the pre-woven reinforcing net can be placed inside the rigid polyurethane core material 2 by means of mold injection molding. Specifically, during production, the reinforcing net is accurately placed in the center position of the raw material of the rigid polyurethane core material 2 before foaming and curing, or the embedding depth is adjusted according to the predetermined design requirements, and then the appropriate pressure is applied using a molding mold and the curing process is completed, thereby realizing the integrated molding of the reinforcing net and the core material. This way ensures that the reinforcing net can be uniformly distributed in the desired position without affecting the basic properties of the core material, strengthening the overall mechanical properties of the sandwich panel.

[0036] As shown in Figure 2 and Figure 3 , in one embodiment, the rigid polyurethane core material 2 of a metal-faced rigid polyurethane sandwich panel of the present application is provided with special structure sawtooth cavities 7 on the top and bottom, which are matched with the cross texture 11 on the surface of the metal outer panel 1. The presence of the sawtooth cavities 7 forms an embedded fit between the rigid polyurethane core material 2 and the metal outer panel 1, further limiting the relative slip between the two. Through this design, the mechanical interlocking performance between the contact interface is enhanced, thereby improving the stability and connection firmness of the overall sandwich panel.

[0037] Specifically, the serration cavity 7 is a recessed area composed of regular or irregular geometric shapes, which is strictly corresponding to the layout of the inner cross texture 11 of the metal outer panel 1. The cross texture 11 is composed of micro-grooves 12 and raised ribs, so the serration cavity 7 needs to be adapted to its micro-profile to ensure the bonding force. For example, the serration cavity 7 structure of a specific form can be achieved by controlling the mold shape in the polyurethane foaming process, and the serration cavity 7 is directly formed on both ends of the rigid polyurethane core material 2 during the production process. Then, the rigid polyurethane core material 2 is assembled inside the metal outer panel 1 by appropriate pressure, so that the embedding of the two is more tightly without gaps.

[0038] As shown in Figure 4 In one embodiment, a rubber gasket 8 is provided inside the frame reinforcement 3 of the metal-faced rigid polyurethane sandwich panel of the present application to optimize the structural stability and slip control. Specifically, the rubber gasket 8 is tightly installed on the inner surface of the frame reinforcement 3, covering the key area in contact with the rigid polyurethane core material 2 and the metal outer panel 1. The rubber gasket 8 effectively buffers the impact force caused by vibration through its own flexible properties, and reduces the phenomenon of edge relative slip after the assembly of the metal-faced rigid polyurethane sandwich panel, enhancing the overall structural reliability.

[0039] For example, the frame reinforcement 3 is fixed to the edges of the rigid polyurethane core material 2 and the metal outer panel 1 by means of screws or adhesives, and in this process, the rubber gasket 8 previously embedded inside the frame reinforcement 3 tightly fits the boundary position of the rigid polyurethane core material 2 and the metal outer panel 1. The rubber gasket 8 has a certain thickness and elasticity, which can ensure that even under external pressure or vibration, the contact stability between the sandwich panel components will not be damaged, thus achieving the functional goal.

[0040] As shown in Figure 3 In one embodiment, the anchor rib 4 of the metal-faced rigid polyurethane sandwich panel of the present application is specially designed to improve the interaction force between it and the core components. Specifically, a plurality of small protrusion structures are arranged on the surface of the anchor rib 4 in a staggered manner, which significantly increases the contact surface area and enhances the overall anti-slip ability. These small protrusions can be more deeply embedded into the material interface in contact with them, ensuring that even under complex stress conditions, displacement will not easily occur.

[0041] For example, the manufacture of the above features can be accomplished by precision machining or mold casting, etc. The specific approach is to first produce small protrusion anchoring ribbons 4 with uniform arrangement and random staggered state according to the predetermined design parameters, and then embed them inside the rigid polyurethane core material 2 and ensure correct docking with the metal outer panel 1, while combining other fixing means to tightly combine the components. In addition, in order to ensure the best functional embodiment, factors such as the height, shape and density distribution of the small protrusions on the surface of the anchoring ribbons 4 need to be considered to adapt to the application requirements and compatibility problems in different scenarios.

[0042] As shown in Figure 3 , in one embodiment, the key features of the metal-faced rigid polyurethane sandwich panel of the present application are embodied in the design of the position and connection form of the anchoring ribbons 4. Specifically, one end of the anchoring ribbons 4 is fixed in a predetermined slot in the metal outer panel 1, and this slot structure is pre-formed on the inner surface of the metal outer panel 1 to ensure a firm and precise connection position between the two. At the same time, the other end is embedded inside the rigid polyurethane core material 2 and penetrates into the predetermined area. This two-end combination not only strengthens the connection strength between different material layers, but also significantly reduces the possibility of interlayer slip under external mechanical environment, thereby further improving the overall stability of the composite sandwich panel.

[0043] For example, the anchoring ribbons 4 are fixed by pre-insertion assembly. In the manufacturing process, precise slot structures are first machined in the metal outer panel 1, then one end of the anchoring ribbons 4 is placed in this position and is firmly locked by physical or chemical methods to ensure that there is no possibility of loosening. Then, the other end is inserted into the molten rigid polyurethane core material 2 according to the set path, and through the solidification process, they are completely integrated together. Specifically, this assembly process can ensure that the anchoring ribbons 4 are accurately distributed at specific node positions inside the sandwich panel, meeting the technical requirements of enhancing overall performance.

[0044] As shown in Figure 2 and Figure 3 , in one embodiment, the anchoring ribbons 4 of the metal-faced rigid polyurethane sandwich panel of the present application are filled with a high-strength adhesive layer 9 at the combined part with the rigid polyurethane core material 2, thereby enhancing the connection stability between the two and reducing the possibility of relative slip. As a functional supplement, the high-strength adhesive layer 9 is uniformly filled into the gap area between the anchoring ribbons 4 and the rigid polyurethane core material 2, forming a stable overall structure and effectively avoiding the problem of interface separation caused by external load. This construction method is particularly suitable for working environments that need to withstand stress fluctuations or temperature changes for a long time. The combined part can further adapt to complex situations in actual engineering after special treatment.

[0045] Specifically, to ensure the functionality of the high-strength adhesive layer 9, the adhesive material can be applied in advance before the anchoring rib 4 is embedded in the rigid polyurethane core material 2, while ensuring that the amount of application is appropriate to prevent overflow and contamination of other components. For example, during the manufacturing process, the liquid high-strength adhesive layer 9 is injected into the pre-prepared mounting hole, and then the anchoring rib 4 is precisely inserted and left to set until it is completely cured, thereby forming a firm bond between the two and meeting the structural requirements.

[0046] In actual operation, when the device is in use, the metal outer panel 1 forms a tight bond with the rigid polyurethane core material 2 through the cross texture 11 provided on the inner surface of the metal outer panel 1. The micro-grooves 12 and raised ribs in the cross texture 11 can significantly enhance the interlayer friction and bonding strength, thereby effectively reducing the occurrence of slip deformation. Subsequently, the rigid polyurethane core material 2, under the wrapping of the two metal outer panels 1, provides core insulation performance and overall support capability. At the same time, the anchoring rib 4 is embedded in the rigid polyurethane core material 2 and firmly connected with the metal outer panel 1, ensuring that the entire sandwich panel internal structure has higher overall integrity. The frame reinforcement 3 is tightly combined with the rigid polyurethane core material 2 and the edges of the metal outer panel 1, thereby further enhancing the edge stability and impact resistance of the sandwich panel, and ultimately achieving efficient and stable operation of the metal-faced rigid polyurethane sandwich panel during use.

[0047] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, different embodiments or examples described in the present specification and the features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0048] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of various changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A rigid polyurethane sandwich panel with a metal surface, characterized in that, include: A metal outer panel (1) is used to provide external protection, wherein the inner surface of the metal outer panel (1) is provided with a cross-texture (11) to increase friction, the cross-texture (11) is composed of multiple sets of micro grooves (12) and raised ribs (5) to improve interlayer bonding strength; A rigid polyurethane core material (2) is located between the metal outer panels (1) for insulation and support. The top and bottom of the rigid polyurethane core material (2) are provided with serrated cavities (7). The serrated cavities (7) cooperate with the cross texture (11) to reduce the tendency of slippage between the contact surfaces. A frame reinforcement (3) is provided around the edge of the rigid polyurethane core material (2) to improve impact resistance; Anchor bars (4) are embedded in rigid polyurethane core material (2) and connected to the metal outer panel (1).

2. The rigid polyurethane sandwich panel with a metal surface according to claim 1, characterized in that: The height of the raised ribs (5) is between 0.3 mm and 1 mm, and the spacing is between 2 mm and 4 mm to reduce the risk of interlayer slippage.

3. The rigid polyurethane sandwich panel with a metal surface according to claim 1, characterized in that: The microgroove (12) has a rectangular cross-section structure to reduce the influence of interlayer slip on stiffness.

4. The rigid polyurethane sandwich panel with a metal surface according to claim 1, characterized in that: The rigid polyurethane core (2) is provided with an embedded reinforcing mesh (6) to disperse internal shear stress.

5. A rigid polyurethane sandwich panel with a metal surface according to claim 1, characterized in that: The inner side of the frame reinforcement (3) is provided with a rubber sealing gasket (8) to eliminate the impact of vibration on the sandwich panel structure.

6. A rigid polyurethane sandwich panel with a metal surface according to claim 1, characterized in that: The surface of the anchoring bar (4) is provided with multiple rows of staggered protrusions to increase the surface area of ​​the anchoring area.

7. A rigid polyurethane sandwich panel with a metal surface according to claim 1, characterized in that: One end of the anchoring bar (4) is inserted into a pre-formed slot in the metal outer panel (1), and the other end of the anchoring bar (4) is inserted into the rigid polyurethane core material (2).

8. A rigid polyurethane sandwich panel with a metal surface according to claim 1, characterized in that: The joint between the anchoring bar (4) and the rigid polyurethane core material (2) is filled with a high-strength adhesive layer (9).

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