A uniform glue spreading mechanism for honeycomb panel glue spraying and pressing molding

Abstract

The utility model provides a kind of even glue spreading mechanism of honeycomb board gluing press forming, belong to glue spreading mechanism technical field, the even glue spreading mechanism of honeycomb board gluing press forming is used to carry out glue solution coating on honeycomb board surface, including glue spreading body, the glue spreading body has separate glue cavity and flow guide cavity, it is communicated between separate glue cavity and flow guide cavity by gradual transition section, the cross-sectional area of gradual transition section gradually increases along glue solution flow direction, the bottom of flow guide cavity is equipped with multiple glue outlets, spiral flow guide vane is arranged in separate glue cavity, the helix angle of spiral flow guide vane gradually reduces along glue solution flow direction, pressure-equalizing plate is arranged in flow guide cavity, the utility model can solve the obvious difference of coating thickness of glue solution in different regions of honeycomb board, so that the technical problem that the bonding strength between honeycomb board core material and panel after press forming is uneven.

Description

Technical Field

[0001] This utility model belongs to the technical field of adhesive application mechanism, specifically, it relates to a uniform adhesive application mechanism for honeycomb panel coating and pressing. Background Technology

[0002] Honeycomb panels, as a lightweight and high-strength composite material structure, are widely used in aerospace, rail transportation, building decoration, and packaging and transportation. A key manufacturing process involves coating the honeycomb core material with adhesive and then pressing it against the panel. The uniformity of the adhesive coating directly determines the final quality of the honeycomb panel. Common adhesive application methods in existing technologies include roller coating, spraying, and curtain coating. Roller coating uses a roller to apply adhesive to the honeycomb panel surface, but the uneven contact between the roller and the irregular surface of the honeycomb core material can easily lead to localized adhesive accumulation or gaps. While spraying covers a large area, the spray particles are uneven in size and easily affected by airflow, making precise control of the coating thickness difficult. Curtain coating allows the adhesive to flow from a coating device onto the honeycomb panel surface, making it relatively simple and efficient. However, existing curtain coating devices often use simple distribution plates or perforated plates. In this structure, the adhesive enters through the inlet and flows directly out through the manifold or perforated plate. Due to the flow inertia and viscosity characteristics of the adhesive itself, dominant flow channels are easily formed in certain areas of the manifold or perforated plate, resulting in a large flow rate of adhesive in these areas and a small flow rate in other areas. This ultimately leads to uneven distribution of adhesive on the surface of the honeycomb panel. Some manufacturers have tried to improve uniformity by increasing the number of manifold layers or reducing the pore size of the perforated plate, but these methods increase the flow resistance of the adhesive, reduce the adhesive application efficiency, and still cannot fundamentally solve the problem of uneven adhesive distribution. Utility Model Content

[0003] In view of this, the present invention provides a uniform adhesive distribution mechanism for honeycomb panel coating and pressing, which can solve the technical problem that the coating thickness of the adhesive varies significantly in different areas of the honeycomb panel, resulting in uneven bonding strength between the core material and the panel of the pressed honeycomb panel.

[0004] This utility model is implemented as follows:

[0005] This utility model provides a uniform adhesive application mechanism for honeycomb panel coating and pressing, used for applying adhesive to the surface of the honeycomb panel. The mechanism includes an adhesive application body with an adhesive distribution cavity and a flow guiding cavity. The adhesive distribution cavity and the flow guiding cavity are connected by a gradual transition section, the cross-sectional area of ​​which gradually increases along the adhesive flow direction. The bottom of the flow guiding cavity has multiple adhesive outlets. The adhesive distribution cavity contains spiral guide vanes with a spiral helix angle that gradually decreases along the adhesive flow direction. The flow guiding cavity contains a pressure equalization plate, which is fixedly connected to the top of the flow guiding cavity by several support columns. The lower surface of the pressure equalization plate is an arc-shaped concave surface, the radius of curvature of which matches the radius of curvature of the honeycomb panel surface. The adhesive outlets are arranged in an array along the bottom of the flow guiding cavity, with the spacing between adjacent outlets remaining consistent along the width of the flow guiding cavity.

[0006] The technical effects of the uniform adhesive distribution mechanism for honeycomb panel pressing and molding provided by this utility model are as follows: By setting spiral guide vanes with a spiral angle that gradually decreases along the direction of adhesive flow in the adhesive distribution chamber, the adhesive is made to rotate and flow after entering the adhesive distribution chamber, and the flow rate is gradually reduced, so as to achieve the initial uniform dispersion of the adhesive. At the same time, the design of the gradually increasing cross-sectional area of ​​the transition section makes the flow rate of the adhesive transition smoothly and avoids turbulence. Then, the pressure equalization plate with an arc concave surface in the guide chamber performs secondary pressure equalization and distribution of the adhesive. With the help of the array of equally spaced adhesive outlets, it is ensured that the adhesive forms a uniform coating layer on the surface of the honeycomb panel, which effectively solves the problem of unstable honeycomb panel pressing and molding quality caused by uneven adhesive distribution in traditional adhesive distribution mechanisms.

[0007] Based on the above technical solution, the uniform adhesive distribution mechanism for honeycomb panel coating and pressing of this utility model can be further improved as follows:

[0008] The outer edge of the spiral guide vane forms an annular gap with the inner wall of the dispensing cavity, and the width of the annular gap is uniformly distributed along the axial direction of the dispensing cavity.

[0009] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by forming an annular gap that is uniformly distributed along the axial direction between the outer edge of the spiral guide vane and the inner wall of the dispensing chamber, when the adhesive flows in rotation under the guidance of the spiral guide vane, part of the adhesive forms a circumferential flow through the annular gap, avoiding excessive concentration of the adhesive on one side of the spiral guide vane, further improving the uniform dispersion effect of the adhesive in the dispensing chamber, providing a more stable adhesive flow state for subsequent uniform dispensing, and reducing the phenomenon of excessively thick or thin local adhesive layers caused by uneven adhesive distribution.

[0010] Furthermore, the inner wall surface of the gradient transition section has a trumpet-shaped structure with an expansion angle of 15° to 30°, and the length of the gradient transition section is greater than twice the diameter of the separation cavity.

[0011] The beneficial effects of adopting the above-mentioned improved scheme are as follows: by using a trumpet-shaped gradual transition section and controlling the expansion angle within a specific range, the cross-sectional area of ​​the adhesive gradually expands when it enters the guide cavity from the dispensing cavity, avoiding eddies and pressure fluctuations caused by abrupt changes in cross-section. At the same time, by setting the length of the gradual transition section to be more than twice the diameter of the dispensing cavity, sufficient flow adjustment space is provided for the adhesive, allowing the adhesive to complete a smooth transition in flow rate and pressure before entering the guide cavity, ensuring that the adhesive reaches the outlet in a stable and uniform state, and improving the consistency and stability of adhesive application.

[0012] Furthermore, the thickness of the equalizing plate gradually increases along its radial direction, and the thickness at the edge of the equalizing plate is greater than the thickness at the center.

[0013] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by designing a structure in which the thickness of the pressure equalizing plate gradually increases radially, the pressure equalizing plate has a better rigidity distribution when subjected to adhesive pressure. The larger thickness at the edge can effectively resist the greater pressure generated by the adhesive on the edge area, while the smaller thickness at the center ensures the smooth flow of adhesive in the center area. This thickness gradient design allows the arc-shaped concave surface of the lower surface of the pressure equalizing plate to maintain a stable geometric shape under the action of adhesive pressure, and will not affect the uniform distribution of adhesive due to deformation under force, thus ensuring the consistency of adhesive pressure at the dispensing port.

[0014] Furthermore, the support column has a cylindrical structure, and the number of support columns is 3 to 6. The support columns are evenly distributed along the circumference of the pressure equalizing plate, and the diameter of the support column is less than half the distance between adjacent glue outlets.

[0015] The beneficial effects of adopting the above-mentioned improved scheme are as follows: by setting the number of cylindrical support columns to 3 to 6 and distributing them evenly along the circumference of the pressure equalizing plate, the obstruction effect of the support columns on the flow of adhesive is minimized while ensuring that the pressure equalizing plate has sufficient support strength. At the same time, the diameter of the support columns is controlled to be less than half of the distance between adjacent dispensing ports, so that the influence of the support columns on the flow field of adhesive is minimized. The adhesive can flow freely in the space between the support columns and be evenly distributed to each dispensing port, avoiding the problem of local adhesive flow obstruction or uneven flow rate caused by improper setting of support columns.

[0016] Furthermore, the dispensing port has a circular hole structure, and the inner wall surface of the dispensing port is chamfered. The angle of the chamfer is 30° to 60°, and the depth of the chamfer is 1 / 10 to 1 / 5 of the diameter of the dispensing port.

[0017] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: By setting a chamfer of a specific angle and depth on the inner wall surface of the circular orifice, the adhesive is guided by the chamfer surface when flowing out of the outlet, reducing the frictional resistance between the adhesive and the inner wall of the outlet, avoiding adhesive accumulation or stringing at the edge of the outlet. At the same time, the chamfer structure makes the adhesive flow into a more uniform liquid column. When the liquid column comes into contact with the surface of the honeycomb panel, it can quickly spread to form a uniform adhesive film, improving the accuracy of adhesive application and surface quality, and reducing defects caused by uneven adhesive layer during subsequent pressing and molding processes.

[0018] Furthermore, the spiral guide vane is rotatably connected to the inner wall of the dispensing cavity via a bearing, the pitch of the spiral guide vane gradually decreases along the axial direction, and the blade thickness of the spiral guide vane remains uniform along the radial direction.

[0019] The beneficial effects of adopting the above-mentioned improved scheme are as follows: by rotating and fixing the spiral guide vanes to the inner wall of the dispensing chamber, not only is reliable installation of the spiral guide vanes achieved, but also the design of the spiral guide vane pitch gradually decreasing along the axial direction makes the rotation speed of the adhesive gradually decrease as the flow distance increases. At the same time, the thickness of the vane is kept uniform along the radial direction, ensuring that the adhesive is subjected to a consistent guiding effect at all positions of the spiral guide vane, and realizing a smooth transition of the adhesive from high-speed rotating flow to low-speed uniform distribution.

[0020] Furthermore, the adhesive cloth body is made of stainless steel, and the pressure equalizing plate is made of polytetrafluoroethylene.

[0021] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: By using stainless steel to make the adhesive spreading body, the high strength and corrosion resistance of stainless steel ensure that the adhesive spreading body maintains structural stability and surface smoothness in working environments where it is in long-term contact with adhesive. At the same time, by using polytetrafluoroethylene (PTFE) to make the pressure equalizing plate, the excellent non-stick and self-lubricating properties of PTFE ensure that the adhesive hardly adheres to or resists when flowing on the surface of the pressure equalizing plate, avoiding flow channel blockage or uneven adhesive distribution caused by adhesive residue on the surface of the pressure equalizing plate, thereby improving the service life of the adhesive spreading mechanism and the stability of adhesive spreading quality.

[0022] Furthermore, the axis of the dispensing cavity is perpendicular to the bottom surface of the guide cavity, the guide cavity has a rectangular groove structure, and the length direction of the guide cavity is parallel to the length direction of the honeycomb plate.

[0023] The beneficial effects of adopting the above-mentioned improved scheme are as follows: by setting the axis of the dispensing cavity to be perpendicular to the bottom surface of the guide cavity, the adhesive enters the guide cavity in a vertical direction after passing through the spiral guide blades and the gradual transition section. Under the action of gravity, the adhesive flows downward evenly and is diverted by the pressure equalization plate. Combined with the rectangular groove structure of the guide cavity, the adhesive is evenly distributed along the length of the guide cavity. The parallel setting of the length of the guide cavity to the length of the honeycomb panel ensures that the adhesive outlet array perfectly corresponds to the adhesive distribution area of ​​the honeycomb panel, realizing uniform adhesive distribution throughout the entire length of the honeycomb panel and avoiding the offset of the adhesive distribution area or incomplete coverage caused by improper structural arrangement.

[0024] Furthermore, the lowest point of the arc-shaped concave surface on the lower surface of the pressure equalizing plate is located at the geometric center of the pressure equalizing plate, the distance between the edge of the arc-shaped concave surface and the bottom of the guide cavity is greater than the distance between the lowest point of the arc-shaped concave surface and the bottom of the guide cavity, and the distance between the end of the spiral guide blade and the inlet end of the gradual transition section is 1 / 5 to 1 / 3 of the total length of the spiral guide blade.

[0025] The beneficial effects of the above-mentioned improved scheme are as follows: by setting the lowest point of the arc-shaped concave surface on the lower surface of the pressure equalizing plate at the geometric center of the pressure equalizing plate, the adhesive first gathers at the center and diffuses to the surrounding areas under the guidance of the pressure equalizing plate, forming a flow pattern that is evenly distributed from the center to the edge. At the same time, by setting the distance between the edge of the arc-shaped concave surface and the bottom of the guide cavity to be greater than the distance between the lowest point and the bottom of the guide cavity, more flow space is provided for the adhesive in the edge area, compensating for the pressure loss that may occur in the edge area due to the longer flow path. In conjunction with the specific distance reserved between the end of the spiral guide vane and the inlet end of the gradual transition section, the adhesive has a buffer adjustment space after leaving the spiral guide vane, avoiding the flow field turbulence caused by the direct impact of the rotating flow on the gradual transition section, and further optimizing the uniform distribution effect of the adhesive.

[0026] Compared with existing technologies, the beneficial effects of the uniform adhesive distribution mechanism for honeycomb panel coating and pressing provided by this utility model are as follows: This utility model achieves rotational dispersion and circumferential uniform distribution of the adhesive liquid by setting spiral guide vanes with a gradually decreasing spiral angle along the flow direction in the adhesive distribution cavity, and cooperating with the uniform annular gap formed between the outer edge of the spiral guide vanes and the inner wall of the adhesive distribution cavity. This solves the problems of flow deviation and concentration that easily occur after the adhesive liquid enters the adhesive distribution mechanism. Then, the gradual transition section of the trumpet-shaped expansion structure achieves a smooth transition of adhesive liquid flow rate and pressure, avoiding the eddies and pressure fluctuations caused by traditional right-angle turning structures. Finally, the pressure equalization plate with an arc-shaped concave surface set in the guide cavity and the uniformly distributed circumferential... The support column performs secondary pressure equalization and fine distribution of the adhesive, allowing the adhesive to be applied to the honeycomb panel surface at a uniform pressure and flow rate through an array of equally spaced adhesive outlets. Compared to the simple gravity flow or single-flow-plate adhesive application mechanisms in existing technologies, this invention fundamentally improves the flow state and distribution uniformity of the adhesive through a multi-stage flow equalization and pressure equalization structure design. This keeps the adhesive coating thickness deviation in different areas of the honeycomb panel surface within a smaller range, significantly improving the bonding strength uniformity and product quality stability of the honeycomb panel after pressing and molding. At the same time, precise control of adhesive usage avoids adhesive waste and reduces production costs. Overall, this invention achieves quality improvement and efficiency optimization in the honeycomb panel adhesive coating and pressing process. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the internal structure of a uniform adhesive distribution mechanism for honeycomb panel coating and pressing.

[0029] Figure 2 A front view of a uniform adhesive application mechanism for honeycomb panel coating and pressing.

[0030] The attached diagram lists the components represented by each number as follows:

[0031] 10. Adhesive distribution body; 20. Adhesive distribution chamber; 21. Spiral reverse flow blade; 22. Pressure equalizing plate; 30. Flow guiding chamber; 31. Adhesive outlet; 40. Gradual transition section. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0033] like Figure 1-2 The image shows an embodiment of a uniform adhesive application mechanism for honeycomb panel coating and pressing, provided by this utility model. In this embodiment, it is used to apply adhesive to the surface of the honeycomb panel and includes an adhesive application body 10. The adhesive application body has an adhesive distribution cavity 20 and a flow guiding cavity 30. The adhesive distribution cavity and the flow guiding cavity are connected by a gradual transition section 40. The cross-sectional area of ​​the gradual transition section gradually increases along the direction of adhesive flow. The bottom of the flow guiding cavity is provided with multiple adhesive outlets 31. The adhesive distribution cavity is provided with a spiral guide vane 21. The spiral angle of the spiral guide vane gradually decreases along the direction of adhesive flow. The flow guiding cavity is provided with a pressure equalizing plate 22. The pressure equalizing plate is fixedly connected to the top of the flow guiding cavity by several support columns. The lower surface of the pressure equalizing plate is an arc-shaped concave surface. The radius of curvature of the arc-shaped concave surface matches the radius of curvature of the honeycomb panel surface. The adhesive outlets are distributed in an array along the bottom of the flow guiding cavity, and the spacing between adjacent adhesive outlets is consistent along the width direction of the flow guiding cavity.

[0034] In the above technical solution, an annular gap is formed between the outer edge of the spiral guide vane and the inner wall of the dispensing cavity, and the width of the annular gap is uniformly distributed along the axial direction of the dispensing cavity.

[0035] Furthermore, in the above technical solution, the inner wall surface of the gradient transition section has a trumpet-shaped structure with an expansion angle of 15°~30°, and the length of the gradient transition section is greater than twice the diameter of the separation cavity.

[0036] Furthermore, in the above technical solution, the thickness of the equalizing plate gradually increases along its radial direction, and the thickness at the edge of the equalizing plate is greater than the thickness at the center.

[0037] Furthermore, in the above technical solution, the support column has a cylindrical structure, the number of support columns is 3 to 6, the support columns are evenly distributed along the circumference of the pressure equalizing plate, and the diameter of the support column is less than half the distance between adjacent glue outlets.

[0038] Furthermore, in the above technical solution, the glue outlet has a circular hole structure, and the inner wall surface of the glue outlet is chamfered. The chamfer angle is 30°~60°, and the chamfer depth is 1 / 10~1 / 5 of the glue outlet diameter.

[0039] Furthermore, in the above technical solution, the spiral guide vane is rotatably connected to the inner wall of the dispensing cavity via a bearing, the pitch of the spiral guide vane gradually decreases along the axial direction, and the thickness of the spiral guide vane remains uniform along the radial direction.

[0040] Furthermore, in the above technical solution, the adhesive cloth body is made of stainless steel, and the pressure equalizing plate is made of polytetrafluoroethylene.

[0041] Furthermore, in the above technical solution, the axis of the dispensing cavity is perpendicular to the bottom surface of the guide cavity, the guide cavity has a rectangular groove structure, and the length direction of the guide cavity is parallel to the length direction of the honeycomb plate.

[0042] Furthermore, in the above technical solution, the lowest point of the arc-shaped concave surface on the lower surface of the pressure equalizing plate is located at the geometric center of the pressure equalizing plate, the distance between the edge of the arc-shaped concave surface and the bottom of the guide cavity is greater than the distance between the lowest point of the arc-shaped concave surface and the bottom of the guide cavity, and the distance between the end of the spiral guide blade and the inlet end of the gradual transition section is 1 / 5 to 1 / 3 of the total length of the spiral guide blade.

[0043] First, place the honeycomb panel on the worktable of the pressing and molding equipment, ensuring that the surface of the honeycomb panel is horizontal and its position is fixed. Then, install the uniform adhesive distribution mechanism of this invention on the moving support of the pressing and molding equipment. Adjust the mechanism to maintain a suitable distance between the bottom of the guide cavity of the adhesive distribution body and the surface of the honeycomb panel. Generally, this distance is set to 3 to 5 times the diameter of the adhesive outlet. Next, start the adhesive delivery system to deliver the prepared adhesive through the pipeline to the inlet of the adhesive distribution chamber of the adhesive distribution body. Under the pressure of the delivery pump, the adhesive enters the adhesive distribution chamber and begins to rotate and flow under the guidance of the spiral guide vanes, gradually diffusing. After passing through the transition section, it enters the guide cavity, where it is distributed by the pressure equalization plate. The adhesive is applied to form a uniform pressure distribution and then evenly coated onto the surface of the honeycomb panel through each outlet. During the adhesive application process, the adhesive application mechanism can be moved at a constant speed along the length of the honeycomb panel by moving the support, or the adhesive application mechanism can be kept fixed while the honeycomb panel moves at a constant speed. The moving speed is adjusted according to the adhesive flow rate and the required coating thickness. After the adhesive application is completed, the honeycomb panel coated with adhesive is immediately stacked with the panel and placed into the pressing equipment for pressure curing. Throughout the use process, it is necessary to regularly check the cleanliness of each component of the adhesive application mechanism, especially ensuring that there is no adhesive residue blocking the outlets. After use, the inside of the adhesive application mechanism should be cleaned with a cleaning agent to keep the flow channels unobstructed.

[0044] The following is a specific embodiment 1 of this utility model: The uniform adhesive distribution mechanism in this embodiment is made of 304 stainless steel through precision casting. The total length of the adhesive distribution body is 450mm. The adhesive dispensing cavity has a cylindrical structure with an inner diameter of 60mm and a length of 180mm. One end of the adhesive dispensing cavity is provided with an external thread interface for connecting the adhesive delivery pipeline, and the other end is connected to the guide cavity through a gradual transition section. The spiral guide blade is also made of 304 stainless steel. An external thread that mates with the thread on the inner wall of the adhesive dispensing cavity is formed on its outer surface by turning. The total length of the spiral guide blade is 150mm. Its spiral helix angle is 25 degrees at the beginning and decreases by 5 degrees every 30mm along the axial direction, reaching 10 degrees at the end. The thickness of the spiral guide blade is 5mm and the outer diameter is 56mm. A 2mm wide annular gap is formed between the spiral guide blade and the inner wall of the adhesive dispensing cavity. This annular gap remains consistent along the entire length of the spiral guide blade. The gradient transition section adopts a trumpet-shaped internal cavity structure. The inlet diameter is 60mm, the same as the inner diameter of the dispensing chamber, while the outlet diameter is enlarged to 120mm. The entire gradient transition section is 150mm long with an expansion angle of 20 degrees. The inner wall surface is finely polished to achieve a smoothness of less than 0.8 micrometers, ensuring minimal surface friction resistance during adhesive flow. The guide cavity has a rectangular trough structure, 400mm long, 120mm wide, and 40mm deep. The bottom of the guide cavity has 32 dispensing ports arranged in a 4x8 array. Each dispensing port has a diameter of 8mm, and the center-to-center distance between adjacent dispensing ports is 50mm in the length direction and 30mm in the width direction. The inner wall of the dispensing port has a 45-degree chamfer at the upper end, with a chamfer depth of 1.5mm. The equalizing plate is made of polytetrafluoroethylene (PTFE) through a molding process. Its planar shape is elliptical, with a major axis of 360mm and a minor axis of 100mm. The thickness at the center is 8mm, gradually increasing to 15mm at the edges. The lower surface is a concave arc with a radius of curvature of 800mm. The lowest point is located at the geometric center of the equalizing plate, 12mm from the bottom of the flow guide cavity. The distance between the edge of the concave arc and the bottom of the flow guide cavity is 18mm. The support columns are made of 304 stainless steel, cylindrical in shape, with a diameter of 10mm and a length of 40mm. Four support columns are installed, located 70mm and 45mm from the center along the major and minor axes of the equalizing plate, respectively. The upper end of the support column is threaded to the top of the flow guide cavity, and the lower end is threaded to the upper surface of the equalizing plate.In practical use, epoxy resin liquid with a viscosity of 3000 mPa·s is delivered to the dispensing chamber by a pump at a flow rate of 2 liters per minute. The liquid forms a rotating flow under the guidance of the spiral guide vanes, and enters the guide chamber after passing through the gradual transition section. Under the pressure equalization action of the pressure equalization plate, it flows out evenly from 32 dispensing ports. The dispensing mechanism is driven by the moving bracket to move along the length of the honeycomb panel at a speed of 100 mm per second, achieving uniform dispensing on the surface of the honeycomb panel with a length of 1200 mm and a width of 400 mm. After the coating is completed, the thickness of the liquid at different positions on the surface of the honeycomb panel is measured. The thickness of the liquid at each point is within the range of 0.35 mm to 0.42 mm, with good thickness uniformity. The peel strength test of the honeycomb panel after pressing and curing shows that the difference in bonding strength between different areas is less than 8%, and the product quality is stable and reliable.

[0045] The following is another specific embodiment 2 of this utility model: This embodiment 2 is based on embodiment 1, and the structure of the spiral guide blade is improved. A group flow groove is opened every 20mm along the spiral direction on the surface of the spiral guide blade. Each group flow groove includes 3 parallel shallow grooves. The width of each shallow groove is 2mm and the depth is 1mm. The function of these flow grooves is to further refine the flow path of the adhesive on the surface of the spiral guide blade, so that the adhesive not only rotates and flows in the spiral direction, but also generates small pulsating disturbances in the radial direction, thereby enhancing the mixing uniformity of the adhesive. Meanwhile, the radius of curvature of the concave surface on the lower surface of the equalizing plate was adjusted to 600mm, making the curvature of the concave surface larger. The diffusion angle of the adhesive under the guidance of the concave surface is increased, which can diffuse to the edge area more quickly. This improvement is particularly suitable for adhesives with high viscosity. Through enhanced mixing disturbance and faster radial diffusion, even when the adhesive viscosity reaches 5000mPa·s, good uniformity of adhesive application can still be maintained. Tests have shown that this improvement scheme has improved the coating thickness uniformity of high viscosity adhesives by 12%, meeting the production needs of aerospace honeycomb panels with more stringent adhesive performance requirements.

[0046] The following is another specific embodiment 3 of this utility model: This embodiment 3 is based on embodiment 1, and the structure of the glue outlet is optimized and improved. A miniature rectifier is added below each glue outlet. The rectifier is made of polytetrafluoroethylene material and is in the shape of an inverted truncated cone. The upper diameter is the same as the glue outlet diameter, which is 8mm. The lower diameter is 12mm and the height is 6mm. The rectifier is fixed directly below the glue outlet by a thin support rod, maintaining a distance of 3mm from the glue outlet. After the glue flows out of the glue outlet, it first impacts the conical surface of the rectifier. Under the guidance of the conical surface, it spreads in all directions to form a uniform annular liquid curtain. Then, these liquid curtains converge and fall vertically onto the surface of the honeycomb panel. This rectifier setting makes the glue flowing out of each glue outlet undergo secondary rectification, further eliminating the possible slight flow differences at the glue outlet, and making the glue finally coated on the surface of the honeycomb panel more uniform. Meanwhile, the working distance between the bottom of the flow guide cavity and the surface of the honeycomb panel was adjusted from the original 24mm to 35mm, providing sufficient space for the installation of the rectifier and the rectification and diffusion of the adhesive. This improved solution is particularly suitable for the production of decorative honeycomb panels with extremely high surface quality requirements. After the rectifier treatment, the surface smoothness of the adhesive coating layer is significantly improved, and the surface waviness of the coating layer is reduced from the original 0.08mm to 0.03mm, so that the gloss and smoothness of the honeycomb panel surface reach a higher standard, meeting the stringent requirements of the high-end building decoration field for the appearance quality of honeycomb panels.

[0047] Specifically, the principle of this invention is as follows: This invention employs a multi-stage flow-dividing and pressure-equalizing technique to achieve uniform distribution of the adhesive. First, within the dispensing chamber, spiral guide vanes apply a rotating guiding effect to the incoming adhesive. The spiral angle of the guide vanes gradually decreases along the flow direction, causing the rotational speed of the adhesive to gradually decrease with the flow. This utilizes the centrifugal force of the rotating flow to uniformly diffuse the adhesive in all directions, while avoiding instability caused by excessively high rotational speeds in subsequent flows. Simultaneously, the uniform annular gap between the outer edge of the spiral guide vanes and the inner wall of the dispensing chamber forms a circumferential flow-dividing channel, preventing excessive concentration of the adhesive at any one circumferential position, thus achieving the first stage of circumferential uniform distribution. Then, the adhesive enters a gradual transition section. The trumpet-shaped expansion structure gradually increases the cross-sectional area. According to the fluid continuity equation, the increased cross-sectional area leads to a decrease in flow velocity, which in turn decreases the dynamic pressure and increases the static pressure. This gradual transition ensures a smooth transition in adhesive pressure and flow velocity, avoiding separation vortices and localized issues caused by sudden expansion. Pressure fluctuations create favorable conditions for subsequent pressure equalization. After the adhesive enters the flow channel, it encounters the arc-shaped concave surface of the pressure equalization plate. The arc-shaped concave surface guides the adhesive to diffuse evenly from the center to the edge. At the same time, the thickness gradient design of the pressure equalization plate ensures that it maintains a stable shape and does not deform under the pressure of the adhesive. Through the reasonable arrangement of the support columns, the support strength of the pressure equalization plate is guaranteed, while minimizing interference with the flow of the adhesive. Finally, the adhesive flows out through an array of equally spaced outlets. Due to the multi-stage processing in the preceding stages, the pressure and flow rate of the adhesive have reached a highly uniform state, so the amount of adhesive discharged from each outlet is basically the same. In addition, the chamfered structure of the inner wall of the outlet optimizes the flow state of the adhesive, so that the adhesive coated on the surface of the honeycomb panel forms a uniform adhesive film layer. The entire technical principle reflects the comprehensive application of multiple principles in fluid mechanics, such as flow equalization, gradual transition, and boundary layer control. By actively regulating the flow state of the adhesive through structural design, rather than passively relying on the natural flow of the adhesive, the uniformity of adhesive distribution is fundamentally guaranteed.

[0048] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A uniform adhesive application mechanism for honeycomb panel coating and pressing, used for applying adhesive to the surface of the honeycomb panel, comprising an adhesive application body, wherein the adhesive application body has an adhesive dispensing cavity and a flow guiding cavity, the adhesive dispensing cavity and the flow guiding cavity are connected by a gradual transition section, the cross-sectional area of ​​the gradual transition section gradually increases along the direction of adhesive flow, and the bottom of the flow guiding cavity is provided with multiple adhesive outlets, characterized in that, The dispensing chamber is equipped with spiral guide vanes, the spiral angle of which gradually decreases along the direction of glue flow. The dispensing chamber is also equipped with a pressure equalizing plate, which is fixedly connected to the top of the dispensing chamber by several support columns. The lower surface of the pressure equalizing plate is an arc-shaped concave surface, the radius of curvature of which matches the radius of curvature of the honeycomb panel surface. The glue outlets are arranged in an array along the bottom of the dispensing chamber, and the spacing between adjacent glue outlets remains consistent along the width direction of the dispensing chamber.

2. The uniform adhesive distribution mechanism for honeycomb panel coating and pressing according to claim 1, characterized in that, An annular gap is formed between the outer edge of the spiral guide vane and the inner wall of the dispensing cavity, and the width of the annular gap is uniformly distributed along the axial direction of the dispensing cavity.

3. The uniform adhesive distribution mechanism for honeycomb panel coating and pressing according to claim 2, characterized in that, The inner wall of the gradual transition section has a trumpet-shaped structure with an expansion angle of 15° to 30°, and the length of the gradual transition section is greater than twice the diameter of the separation cavity.

4. The uniform adhesive distribution mechanism for honeycomb panel coating and pressing according to claim 3, characterized in that, The thickness of the equalizing plate gradually increases along its radial direction, and the thickness at the edge of the equalizing plate is greater than the thickness at the center.

5. The uniform adhesive distribution mechanism for honeycomb panel coating and pressing according to claim 4, characterized in that, The support column has a cylindrical structure, and there are 3 to 6 support columns. The support columns are evenly distributed along the circumference of the pressure equalizing plate, and the diameter of the support column is less than half the distance between adjacent glue outlets.

6. The uniform adhesive distribution mechanism for honeycomb panel coating and pressing according to claim 5, characterized in that, The dispensing port has a circular hole structure, and the inner wall surface of the dispensing port is chamfered. The angle of the chamfer is 30° to 60°, and the depth of the chamfer is 1 / 10 to 1 / 5 of the diameter of the dispensing port.

7. The uniform adhesive distribution mechanism for honeycomb panel coating and pressing according to claim 6, characterized in that, The spiral guide vane is rotatably connected to the inner wall of the dispensing cavity via a bearing. The pitch of the spiral guide vane gradually decreases along the axial direction, and the thickness of the spiral guide vane remains uniform along the radial direction.

8. The uniform adhesive distribution mechanism for honeycomb panel coating and pressing according to claim 7, characterized in that, The adhesive cloth body is made of stainless steel, and the pressure equalizing plate is made of polytetrafluoroethylene.

9. The uniform adhesive distribution mechanism for honeycomb panel coating and pressing according to claim 8, characterized in that, The axis of the dispensing cavity is perpendicular to the bottom surface of the flow guiding cavity. The flow guiding cavity has a rectangular groove structure, and the length direction of the flow guiding cavity is parallel to the length direction of the honeycomb plate.

10. The uniform adhesive distribution mechanism for honeycomb panel coating and pressing according to claim 9, characterized in that, The lowest point of the arc-shaped concave surface on the lower surface of the pressure equalizing plate is located at the geometric center of the pressure equalizing plate. The distance between the edge of the arc-shaped concave surface and the bottom of the flow guide cavity is greater than the distance between the lowest point of the arc-shaped concave surface and the bottom of the flow guide cavity. The distance between the end of the spiral flow guide blade and the inlet end of the gradual transition section is 1 / 5 to 1 / 3 of the total length of the spiral flow guide blade.

Images