Clamping strip sealing assembly for front windshield and mounting method of clamping strip sealing assembly

Abstract

The invention relates to the technical field of front windshield clamping strip structures, in particular to a clamping strip sealing assembly for a front windshield and an installation method thereof.The clamping strip sealing assembly for the front windshield comprises an air inlet grille, a grille clamping jaw is integrally formed at the lower end of the air inlet grille, and the front end of the grille clamping jaw protrudes to form a clamping hook; the clamping strip structure comprises a composite metal framework and a composite hard assembly wrapping the composite metal framework, the composite hard assembly comprises a strip-shaped piece and an asymmetric U-shaped groove, and the U-shaped groove comprises a first straight arm, a second straight arm and a crank arm; and the multi-dimensional sealing unit is used for achieving sealing fit between the grating clamping jaw and the U-shaped groove. Through the composite metal framework and the injection molding mechanical interlocking design, the composite metal framework provides a multi-dimensional combination basis for the composite hard assembly, the composite hard assembly and the metal framework form mechanical interlocking through the injection molding process, and the defect that in the prior art, combination of the framework and the coating layer is not stable is overcome.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of front windshield glass clamping strip structure, in particular to a clamping strip sealing assembly for front windshield glass and a mounting method thereof. BACKGROUND

[0002] The mechanical fixation and multi-dimensional sealing of the front windshield glass and the air inlet grille are usually achieved by a clamping strip sealing assembly. With the continuous improvement of the requirements of the automobile industry on driving safety, comfort and component durability, the clamping strip sealing assembly needs to meet three core requirements: first, the structural strength is sufficient to resist vibration, wind pressure and temperature changes during vehicle driving, so as to avoid component shedding or deformation; second, the sealing performance needs to achieve waterproof, dustproof and air flow penetration prevention, while taking into account a certain sound insulation effect; third, the assembly convenience and adaptability need to adapt to the automatic production line and can adapt to the size difference of the connection of the front windshield glass and the grille of different vehicle models.

[0003] At present, the clamping strip sealing assembly commonly used in the automobile industry has the following four problems to be solved in the technical scheme: First, the combination stability of the framework structure and the coating layer is insufficient The core support structure (metal framework) of the existing clamping strip sealing assembly is mostly made of single rectangular cross-section steel or simple structure formed by stamping, and a composite hard component made of rubber or plastic material is coated outside the framework by injection molding process. Since the surface of the metal framework is mostly smooth structure, the fixation between the coating layer and the metal framework is only realized by the interfacial adhesion force between the materials, and there is a lack of mechanical interlocking structure. Under the conditions of long-term high temperature (such as the temperature of the assembly reaching 60-80℃ after being exposed to the sun in summer), low temperature (extreme temperature below-20℃ in winter) and vibration environment, the coating layer is prone to peeling and warping from the metal framework, resulting in a decrease in the overall rigidity of the clamping strip structure, and even the coating layer falls off, which directly affects the sealing effect and fixation reliability. Although some improved schemes provide simple grooves on the surface of the framework, the groove depth and distribution design is unreasonable, and the problem of "combination force attenuation under cold and hot cycles" cannot be effectively solved.

[0004] Second, the sealing structure is single, and the sealing performance in multiple scenes is insufficient The sealing function of the existing assembly is mainly realized by a single structure: one is to provide a single rubber sealing lip on the fitting surface of the card strip and the front windshield, and rely on the interference fit between the lip and the glass surface for sealing. However, the rubber lip is easily deformed permanently under long-term pressure, which leads to a significant decline in sealing performance after 1-2 years, such as water seepage in rainy days and increased airflow noise during high-speed driving. Another is to provide a simple reverse hook card joint at the matching part of the grille card claw and the U-shaped groove of the card strip, which lacks auxiliary sealing structure. When the vehicle drives on a bumpy road, a small gap is easily generated at the card joint, which leads to the penetration of dust and water vapor from the gap, affecting the cleanliness of the cabin interior and possibly corroding the metal material of the grille card claw. In addition, the existing sealing structure does not adapt to the complex profile (such as the corner and arc area) of the connection between the front windshield and the grille, which is prone to local sealing blind area. SUMMARY

[0005] To solve the above technical problems, the present application is realized by the following technical scheme.

[0006] A card strip sealing assembly for a front windshield, comprising the following components: An air inlet grille, the lower end of which is integrally formed with a grille card claw, the front end of the grille card claw is protruding to form a card hook, and the inner side wall of the card hook is provided with an anti-skid protrusion along the length direction of the grille card claw; A card strip structure, which comprises a composite metal framework and a composite hard component covering the outside of the composite metal framework, the composite hard component comprising a strip-shaped part and an asymmetric U-shaped groove, the U-shaped groove comprising a first straight arm, a second straight arm and a curved arm; A composite glue layer, which is coated on the upper surface of the strip-shaped part and used to connect the strip-shaped part with the front windshield glass; A multi-dimensional sealing unit, which is used to realize the sealing fit of the grille card claw and the U-shaped groove.

[0007] As a preferred scheme of the present application, the composite metal framework comprises a first metal framework and a second metal framework; the composite hard component is interlocked with the composite metal framework by injection molding; and the curved arm of the U-shaped groove is provided with a card joint at the connection with the second straight arm.

[0008] As a preferred scheme of the present application, the card joint extends to the first straight arm to form a first reverse hook at the end away from the strip-shaped part; and the card joint extends to the second straight arm to form a connecting part.

[0009] As a preferred scheme of the present application, the multi-dimensional sealing unit comprises a second reverse hook, and the grille card claw is provided with a boss matched with the second reverse hook.

[0010] As a preferred scheme of the present application, the clamping piece is provided with a water-drop-shaped thickened connecting section at the connecting position with the first barb, and a smooth transition section with a radius of 2-3 mm at the connecting position with the inner wall of the U-shaped groove; the first barb and the clamping piece form a trapezoidal hook groove, and the clamping hook is used for clamping with the hook groove.

[0011] The present application also provides a mounting method of the front windshield clamping strip sealing assembly, which adopts the above front windshield clamping strip sealing assembly and comprises the following steps: S1: pretreatment, cleaning the front windshield glass, the strip-shaped piece and the grid clamping jaw by using a cleaning device, and phosphating the composite metal framework; S2: adaptive gluing, the strip-shaped piece is fixed on a pneumatic clamp, a laser contour instrument of a gluing device scans to generate a gluing path, and a six-axis mechanical arm drives a gluing head to coat a composite gluing layer; S3: assembly, the strip-shaped piece and the front windshield glass are aligned by using a positioning pin, a vacuum chuck tool is attached, a servo pressurizing device applies a gradient pressure, and maintenance is performed for 24 hours; S4: clamping and locking, the grid clamping jaw is axially inserted into the U-shaped groove, radial pressure is applied after rotation and engagement, and the triangular anti-skid structure and the sealing lip are completely matched; S5: detection and optimization, a servo tension testing machine detects the pulling-out force, a helium mass spectrometric leak detector detects the sealing, and when the detection does not meet the requirements, the shape is adjusted or the glue is supplemented.

[0012] As a preferred scheme of the present application, in step S2, the glue storage system of the gluing device is independently controlled in temperature with double cavities, and is provided with a liquid level sensor; in step S4, a visual positioning system is used to monitor the matching gap, and when the gap is greater than 0.1 mm, an electric fine adjustment platform is used for adjustment; in step S5, a hydraulic micro-shaping device is provided with a pressure feedback sensor, and a high-pressure injection device is controlled in glue supplementing amount by using a flow sensor.

[0013] As a preferred scheme of the present application, in step S1, the cleaning device adopts a low-temperature plasma cleaning machine, the cleaning temperature is controlled to be 50-60 ℃, the cleaning time is 30-60 seconds, and the surface oil dirt of the strip-shaped piece and the oxidation layer of the grid clamping jaw are removed; the phosphating treatment adopts a zinc-based phosphating agent, the treatment temperature is 40-50 ℃, the treatment time is 10-15 minutes, and after phosphating, a 5-8 μm thick phosphating film is formed on the surface of the composite metal framework.

[0014] As a preferred scheme of the present application, in step S2, after the composite gluing layer is coated, the strip-shaped piece is placed in a constant-temperature and constant-humidity environment for preliminary solidification, the environmental temperature is controlled to be 25±3 ℃, the relative humidity is 60%-70%, the preliminary solidification time is 30-45 minutes, and after the surface of the composite gluing layer is not sticky, the step S3 is entered; and the glue outlet width of the gluing head is matched with the width of the strip-shaped piece, and the glue outlet speed is kept synchronous with the moving speed of the six-axis mechanical arm.

[0015] As a preferred scheme of the present application, after the step S4 clamping and locking, weather-resistant sealant is injected into the gap between the U-shaped groove and the grid clamping jaw through a high-pressure injection device, the injection pressure is 1.5-2.0 MPa, and the injection is left to stand for 1-2 hours; if the assembly is used in a high-cold area, the matching area is preheated before the sealant is injected, to ensure that the sealant is fully attached to the surface of the assembly.

[0016] The present application has the following beneficial effects: 1. The present application provides a composite metal framework and an injection molding mechanical interlocking design: the composite metal framework provides a multi-dimensional bonding basis for the composite hard component, and the injection molding process forms a mechanical interlocking between the composite hard component and the metal framework, greatly improving the bonding strength between the two, avoiding peeling and warping of the coating layer during long-term use, ensuring the overall rigidity stability of the clamping strip structure, and solving the defect of unstable bonding between the framework and the coating layer in the prior art.

[0017] 2. The present application forms a cooperative seal through the second barb, the boss, the clamping hook and the trapezoidal hook groove, reduces the matching gap from multiple dimensions, and avoids the limitations of a single sealing structure; at the same time, the design is adapted to the structural characteristics of the interface between the front windshield and the grille, reduces the local sealing blind area, improves the waterproof and dustproof effect, meets the sealing requirements in different use scenarios, and solves the problem of insufficient sealing performance in the prior art.

[0018] 3. The present application provides a structure of clamping hook, trapezoidal hook groove, first barb and anti-skid protrusion: the clamping hook is embedded in the trapezoidal hook groove to form a preliminary clamping, the first barb further limits the escape, and a double locking is formed; the anti-skid protrusion enhances the friction after clamping, avoids the relative movement caused by vehicle vibration, greatly improves the clamping reliability and pull-out resistance, ensures that the assembly does not come loose during vehicle driving, and solves the problem of unstable clamping structure in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 FIG. 1 is a structure diagram of the front windshield clamping strip sealing assembly in embodiment 1; Fig. 2 FIG. 2 is a structure diagram of the grid clamping jaw in embodiment 1.

[0020] The reference signs are as follows: 1. air inlet grille; 2. grid clamping jaw; 3. clamping hook; 4. anti-skid protrusion; 7. strip-shaped part; 8. U-shaped groove; 81. first straight arm; 82. second straight arm; 83. curved arm; 9. clamping part; 10. first barb; 12. connecting part; 15. composite glue coating layer; 19. boss; 22. water-drop-shaped thickened connecting section; 23. round and smooth transition section; 24. trapezoidal hook groove; 181. second barb; 51. first metal framework; 52. second metal framework. DETAILED DESCRIPTION

[0021] For a further understanding of the present application, reference will be made to the following detailed description of the application taken in conjunction with the accompanying drawings and embodiments. It is to be understood that the embodiments are merely illustrative of the present application and should not be construed as limiting the present application.

[0022] Embodiment 1, as shown in the figure, provides a front windshield with a sealing assembly of a card strip, which is used to achieve mechanical fixation and multi-dimensional sealing of the front windshield and the air intake grille. The structure includes four core parts: air intake grille, card strip structure, composite glue coating and multi-dimensional sealing unit. The specific structure and connection relationship of each part are as follows: Figs. 1-2 I. Air intake grille and connection structure.

[0023] The air intake grille 1 is the connecting basic component of the assembly and the car head, and the lower end is integrally formed with a grille clamping jaw 2 extending along the length direction. The front end of the grille clamping jaw 2 protrudes outward to form a clamping hook 3, which is the key connection structure for connecting the grille clamping jaw 2 and the card strip structure. In order to enhance the anti-skid effect after clamping, the inner wall of the clamping hook 3 is provided with an anti-skid protrusion 4 along the length direction of the grille clamping jaw 2. The anti-skid protrusion 4 is integrally formed with the clamping hook 3, which is used to form engagement with the adaptive structure of the card strip structure to avoid relative movement after clamping.

[0024] II. Card strip structure.

[0025] The card strip structure is the core functional carrier of the assembly, which includes a composite metal skeleton and a composite hard component wrapped outside. The two are formed into an integrated structure through injection molding process, which is as follows: The composite metal skeleton is composed of a first metal skeleton 51 and a second metal skeleton 52, which provides core strength support for the card strip structure. The composite hard component is wrapped outside the composite metal skeleton through injection molding process, and forms mechanical interlocking with the composite metal skeleton to ensure that the two do not separate under the vibration, temperature change and other environments of the vehicle driving.

[0026] The composite hard component is integrally formed with two functional structures: a strip member 7 and an asymmetric U-shaped groove 8. The strip member 7 is arranged horizontally in a long strip shape, and its upper end surface is used to be attached to the front windshield and coated with a composite glue coating 15 to achieve fixed connection with the front windshield through the composite glue coating 15. The asymmetric U-shaped groove 8 is integrally formed with the strip member 7, and its opening faces the grille clamping jaw 2. Its structure includes a first straight arm 81, a second straight arm 82 and a curved arm 83 connecting the lower ends of the first straight arm 81 and the second straight arm 82, which together form a "U" profile. At the connection between the curved arm 83 of the asymmetric U-shaped groove 8 and the second straight arm 82, a clamping piece 9 is integrally formed, which extends into the asymmetric U-shaped groove 8 to enhance the clamping stability with the grille clamping jaw 2.

[0027] ​The details of the clamping piece 9 are designed as follows: the end of the clamping piece 9 away from the strip-shaped piece 7 extends towards the first straight arm 81 to form a first barb 10; at the same time, the clamping piece 9 extends towards the second straight arm 82 to form a connecting part 12, which is fixedly connected with the second straight arm 82, so that the clamping piece 9 and the asymmetric U-shaped groove 8 form a stable whole. In addition, a water-drop-shaped thickened connecting section 22 is arranged at the connecting position of the clamping piece 9 and the first barb 10, which is used to enhance the structural strength of the stress concentration area; a smooth transition section 23 with a radius of 2-3 mm is arranged at the connecting position of the clamping piece 9 and the inner wall of the asymmetric U-shaped groove 8, which avoids structural cracking caused by stress concentration during assembly; the first barb 10 and the clamping piece 9 jointly enclose a trapezoidal hook groove 24, and the clamping hook 3 at the front end of the grid clamping claw 2 can be embedded in the trapezoidal hook groove 24 to realize the clamping and fixing of the grid clamping claw 2 and the strip structure.

[0028] Three, composite glue coating layer.

[0029] The composite glue coating layer 15 is coated on the upper surface of the strip-shaped piece 7, and its core function is to realize firm bonding of the strip-shaped piece 7 and the front windshield, to provide a reliable connection basis for the fixing of the two, and to ensure the integrated assembly effect of the front windshield and the strip structure.

[0030] Four, multi-dimensional sealing unit.

[0031] The multi-dimensional sealing unit is used to realize the sealing protection of the fitting part of the grid clamping claw 2 and the asymmetric U-shaped groove 8, to avoid the penetration of impurities such as water and dust from the fitting gap. The structure includes a second barb 181, which is adaptively connected with the asymmetric U-shaped groove 8. Correspondingly, a stepped boss 19 is arranged on the grid clamping claw 2, and when the grid clamping claw 2 is inserted into the asymmetric U-shaped groove 8, the second barb 181 and the boss 19 are engaged with each other, which not only enhances the stability of the clamping, but also reduces the fitting gap through structural cooperation to realize sealing protection.

[0032] The technical principle of the front windshield clamping strip sealing assembly described in the patent is as follows: Clamping and fixing of the air inlet grille and the strip structure: the clamping hook 3 of the grid clamping claw 2 is embedded in the trapezoidal hook groove 24 of the strip structure to form preliminary clamping; the first barb 10 of the clamping piece 9 further limits the disengagement direction of the grid clamping claw 2 to form double clamping and locking; at the same time, the anti-slip protrusion 4 inside the clamping hook 3 enhances the friction force after clamping, avoids relative movement caused by vehicle vibration, and ensures the stable connection of the two.

[0033] The integrated fixation of the composite metal framework and the composite hard component: the composite metal framework is composed of a first metal framework 51 and a second metal framework 52, and provides multi-dimensional support for the composite hard component (the strip-shaped part 7 and the asymmetric U-shaped groove 8); through the injection molding process, the composite hard component is tightly wrapped outside the composite metal framework, forming mechanical interlocking rather than relying only on the adhesion of the material interface, so as to ensure that the two do not separate under high and low temperature and vibration environment, and to protect the overall strength of the card strip structure.

[0034] The adhesive fixation of the strip-shaped part and the front windshield: the composite glue coating layer 15 is coated on the upper surface of the strip-shaped part 7, and the strip-shaped part 7 is tightly attached to the front windshield through the adhesive performance of the glue coating layer, so as to provide a stable assembly basis for the front windshield and avoid relative displacement between the front windshield and the card strip structure during driving.

[0035] The multi-dimensional sealing unit realizes sealing through "structural interlocking + gap filling": the second barb 181 and the boss 19 of the grid clamping jaw 2 interlock with each other, reducing the fitting gap between the asymmetric U-shaped groove 8 and the grid clamping jaw 2; at the same time, the close attachment of the clamping hook 3 and the trapezoidal hook groove 24 and the anti-skid effect of the anti-skid protrusion 4 further reduce the gap, form a sealing barrier from multiple dimensions, block the penetration of impurities such as water and dust from the fitting gap, and avoid the influence of impurities on the service life and performance of the component.

[0036] Structural adaptability: the structure of the first straight arm 81, the second straight arm 82 and the curved arm 83 of the asymmetric U-shaped groove 8 adapts to the insertion angle and size of the grid clamping jaw 2, ensuring accurate butt joint during assembly; the structure design of the water drop-shaped thickened connecting section 22 and the smooth transition section 23 avoids structural damage due to stress concentration during assembly, and improves assembly efficiency and reliability.

[0037] Environmental adaptability: the composite metal framework provides sufficient strength for the card strip structure to resist vibration, wind pressure and temperature changes during vehicle driving, and avoids deformation or falling off of the component; the adhesive performance of the composite glue coating layer 15 adapts to different temperature and humidity environments, ensuring the connection stability of the strip-shaped part 7 and the front windshield, and meeting the needs of complex vehicle use scenarios.

[0038] According to the background art, the existing front windshield card strip sealing assembly has the problems of insufficient stability of the combination of the framework and the wrapping layer and single sealing structure, and the technical scheme in the embodiment realizes optimization one by one through targeted design, and the specific technical effects are as follows: I. Solve the problem of "insufficient stability of the combination of the framework and the wrapping layer" In the prior art, the metal framework is usually a single simple structure, and only relies on the interfacial adhesion with the cladding layer, which is easy to peel off in high and low temperature and vibration environment. The present patent is designed by "composite metal framework (first metal framework 51+second metal framework 52)+injection molding mechanical interlocking": the composite metal framework provides a multi-dimensional combination basis for the composite hard component, and the injection molding process forms mechanical interlocking between the composite hard component and the metal framework, greatly improves the combination strength of the two, avoids the peeling and warping of the cladding layer in long-term use, ensures the stability of the overall rigidity of the card strip structure, and solves the defect of unstable combination of the framework and the cladding layer in the prior art.

[0039] II. Solve the problem of "single sealing structure and insufficient sealing performance in multiple scenes" The prior art relies on a single sealing lip or a simple barb, which has poor sealing effect and is easy to have a blind area. The "multi-dimensional sealing unit (second barb 181+boss 19)+card structure (card hook 3+trapezoidal hook groove 24)" of the present patent forms a cooperative sealing: the engagement of the second barb 181 and the boss 19, and the close fit of the card hook 3 and the trapezoidal hook groove 24, reduce the fitting gap from multiple dimensions, avoiding the limitations of single sealing structure; at the same time, this design adapts to the structural characteristics of the junction between the front windshield and the grille, reduces the local sealing blind area, improves the waterproof and dustproof effect, meets the sealing requirements in different use scenes, and solves the problem of insufficient sealing performance in the prior art.

[0040] III. Solve the problem of "low reliability of card locking structure, easy to loosen" The single barb of the prior art has low card pulling force and is easy to loosen. The present patent is designed by "double carding (card hook 3+trapezoidal hook groove 24+first barb 10)+anti-slip protrusion 4": the card hook 3 is embedded in the trapezoidal hook groove 24 to form preliminary carding, and the first barb 10 further limits the pulling out to form double locking; the anti-slip protrusion 4 enhances the friction after carding, avoids the relative movement caused by vehicle vibration, greatly improves the carding reliability and pulling-out resistance, ensures that the component does not loosen during vehicle driving, and solves the problem of unstable carding structure in the prior art.

[0041] Embodiment 2 provides a mounting method of the front windshield card strip sealing assembly, which adopts the front windshield card strip sealing assembly described in embodiment 1, and comprises the following steps: S1: pretreatment, cleaning the front windshield, the strip-shaped part 7 and the grille card claw 2 with a cleaning device; and phosphating the composite metal framework; S2: adaptive gluing, the strip-shaped part 7 is fixed on the pneumatic clamp, the laser contour instrument of the gluing device scans to generate a gluing path, and the six-axis mechanical arm drives the gluing head to coat a composite gluing layer; S3: assembly, aligning the strip-shaped part 7 and the front windshield through the positioning pin, adhering with the vacuum chuck tool, applying gradient pressure with the servo pressurizing device, and curing for 24 hours. S4: clamping and locking, the grid clamping jaw 2 is axially inserted into the U-shaped groove 8, and after rotation and engagement, radial pressure is applied to make the triangular anti-skid structure and the sealing lip fully cooperate; S5: detection and optimization, the servo tension testing machine detects the pull-out force, and the helium mass spectrometer leak detector detects the sealing. If it does not meet the standards, it is shaped or supplemented with glue.

[0042] In step S2, the glue storage system of the glue coating device is double-cavity independent temperature control, and a liquid level sensor is provided. In step S4, a visual positioning system is used to monitor the cooperation gap. When the gap is greater than 0.1 mm, an electric fine adjustment platform is used for adjustment. In step S5, a pressure feedback sensor is provided for the hydraulic micro-shaping device, and a flow sensor is used to control the amount of glue supplementing in the high-pressure injection device.

[0043] In step S1, a low-temperature plasma cleaning machine is used for cleaning, the cleaning temperature is controlled at 50-60°C, the cleaning time is 30-60 seconds, and the surface oil stains and oxidation layer of the grid clamping jaw 2 are removed. Zinc-based phosphating agent is used for phosphating treatment, the treatment temperature is 40-50°C, the treatment time is 10-15 minutes, and after phosphating, a 5-8 μm thick phosphating film is formed on the surface of the composite metal framework.

[0044] In step S2, after the composite glue coating layer is coated, the strip-shaped part 7 is placed in a constant temperature and humidity environment for preliminary curing. The environmental temperature is controlled at 25±3°C, the relative humidity is 60%-70%, the preliminary curing time is 30-45 minutes, and after the surface of the composite glue coating layer is not sticky, it enters step S3. The glue outlet width of the glue coating head is matched with the width of the strip-shaped part 7, and the glue outlet speed is synchronized with the moving speed of the six-axis mechanical arm.

[0045] After step S4 clamping and locking, weather-resistant sealant is injected into the cooperation gap between the U-shaped groove 8 and the grid clamping jaw 2 through the high-pressure injection device, the injection pressure is 1.5-2.0 MPa, and after injection, it is left for 1-2 hours. If the assembly is used in a cold region, the cooperation area is preheated before the sealant is injected to ensure that the sealant fully adheres to the surface of the assembly.

[0046] The installation method of the front windshield sealing assembly provided in the embodiment is based on the assembly structure of embodiment 1. Through process optimization, equipment adaptation and parameter precise control of the whole process of "pretreatment-gluing-assembly-clamping-detection", the problems such as incomplete pretreatment in the existing installation method are solved, and the technical effects are: In the existing installation method, the front windshield, the strip-shaped part 7 and the grid clamping jaw 2 are usually cleaned by simple methods such as alcohol wiping, which is difficult to remove surface oil stains and oxidation layer. The composite metal framework is not subjected to targeted surface treatment, which leads to insufficient adhesion of subsequent gluing and coating. This method realizes breakthrough through two-step optimization: Precise cleaning and enhanced bonding force: using a 50-60℃ low-temperature plasma cleaning machine, through 30-60 seconds of directional cleaning, the oil, dust and metal oxide layer on the surface of the strip-shaped part 7 (removal rate ≥95%) can be completely removed, compared with traditional alcohol wiping, the surface activity of the substrate is improved by 30%-40%, which provides a "impurity-free interface" for the adhesion of the composite coating layer and the strip-shaped part 7, and the engagement of the grid clamping jaw 2 and the U-shaped groove 8, avoiding the adhesion failure or loose engagement caused by impurities in the subsequent process.

[0047] Phosphating treatment enhances structural stability: through 40-50℃, 10-15 minutes of zinc-based phosphating treatment, a 5-8μm thick uniform phosphating film is formed on the surface of the composite metal skeleton, which forms an "anchoring effect" with the injection molding material (such as modified PA66) of the composite hard component, and the mechanical interlocking strength of the two is improved by 25%-30%, solving the problem of easy peeling of the metal skeleton and the coating layer under high and low temperature cycles in the prior art, and ensuring the overall rigidity of the card strip structure in long-term use.

[0048] The existing coating process mostly uses manual or fixed-path mechanical coating, which is prone to problems such as uneven coating thickness and poor curing of the glue layer, affecting the adhesion reliability of the strip-shaped part 7 and the front windshield glass. The method realizes precise coating through "equipment adaptation + environment control": Automatic coating ensures uniformity: the laser profilometer of the coating device scans the surface profile of the strip-shaped part 7 in real time (accuracy ±0.01mm), generates an adaptive coating path, and the six-axis robot drives the coating head to move synchronously, and the width of the coating head outlet is adapted to the width of the strip-shaped part 7, and the coating speed (8-12ml / min) is synchronized with the moving speed of the robot (5-10mm / s), ensuring that the coating thickness deviation of the composite coating layer on the surface of the strip-shaped part 7 is ≤0.05mm (the deviation of the existing process is ≥0.2mm), avoiding insufficient adhesion strength caused by local coating that is too thin or glue layer waste caused by local coating that is too thick.

[0049] Double-cavity temperature control and preliminary curing ensure the performance of the glue layer: the glue storage system of the coating device adopts double-cavity independent temperature control (modified epoxy glue 40-50℃, moisture curing glue 20-25℃), which ensures that the two glue materials are always in the best flow state, avoiding coating blockage or glue layer performance degradation caused by temperature fluctuations; after coating, preliminary curing is carried out for 30-45 minutes in an environment of 25±3℃ and 60%-70% humidity, forming a "non-sticky" stable surface layer on the glue layer surface, which not only avoids contamination of the glue layer during subsequent assembly, but also lays the foundation for 24-hour overall curing, ultimately improving the adhesion strength of the composite coating layer and the front windshield glass. In summary, the above only describes the preferred embodiments of the present application, and any equivalent changes and modifications made within the scope of the present application are included in the scope of the present application.

Claims

1. A windshield sealing strip assembly, characterized in that: Includes the following components: The air intake grille (1) has a grille claw (2) integrally formed at the lower end of the air intake grille (1). The front end of the grille claw (2) protrudes to form a hook (3). The inner side wall of the hook (3) is provided with anti-slip protrusions (4) along the length direction of the grille claw (2). The card strip structure includes a composite metal skeleton and a composite rigid component covering its exterior. The composite rigid component includes a strip (7) and an asymmetric U-shaped groove (8). The U-shaped groove (8) includes a first straight arm (81), a second straight arm (82), and a curved arm (83). A composite adhesive layer (15) is applied to the upper surface of the strip (7) and is used to connect the strip (7) to the windshield. Multidimensional sealing unit, the multidimensional sealing unit is used to achieve the sealing fit between the grid claw (2) and the U-shaped groove (8).

2. The windshield sealing assembly according to claim 1, characterized in that: The composite metal skeleton includes a first metal skeleton (51) and a second metal skeleton (52); the composite rigid component is interlocked with the composite metal skeleton by injection molding; a snap-fit ​​component (9) is provided at the connection between the curved arm (83) of the U-shaped groove (8) and the second straight arm (82).

3. The windshield sealing assembly according to claim 2, characterized in that: The snap-fit ​​member (9) extends from the end away from the strip member (7) toward the first straight arm (81) to form a first barb (10); the snap-fit ​​member (9) extends toward the second straight arm (82) to form a connecting part (12).

4. The windshield sealing assembly according to claim 1, characterized in that: The multidimensional sealing unit includes a second barb (181), and the grid claw (2) is provided with a boss (19) that cooperates with the second barb (181).

5. The windshield sealing assembly according to claim 3, characterized in that: The connection between the snap fastener (9) and the first barb (10) is provided with a teardrop-shaped thickened connecting section (22), and the connection between the snap fastener (9) and the inner wall of the U-shaped groove (8) is provided with a smooth transition section (23) with a radius of 2mm-3mm; the first barb (10) and the snap fastener (9) form a trapezoidal hook groove (24), and the snap hook (3) is used to engage with the hook groove (24).

6. A method for installing a windshield retaining strip sealing assembly, using the windshield retaining strip sealing assembly as described in any one of claims 1-5, comprising the following steps: S1: Pretreatment, cleaning the windshield, strip (7) and grille claws (2) with cleaning equipment; phosphating the composite metal frame; S2: Adaptive gluing, the strip (7) is fixed to the pneumatic clamp, the laser profiler of the gluing device scans to generate the gluing path, and the six-axis robotic arm drives the gluing head to coat the composite gluing layer; S3: Assembly, align the strip (7) with the windshield by positioning pin, fit the vacuum suction cup tooling, apply gradient pressure by servo pressurizing device, and cure for 24 hours; S4: Snap-fit ​​locking, the grid claw (2) is axially inserted into the U-shaped groove (8), rotated and engaged, and then radially pressurized to make the triangular anti-slip structure and sealing lip fully fit together; S5: Optimized testing: Servo tensile testing machine to test pull-out force, helium mass spectrometer leak detector to test seal; if not up to standard, reshaping or re-applying glue.

7. The method according to claim 6, characterized in that: In step S2, the glue storage system of the glue coating device is a dual-chamber independent temperature control system with a liquid level sensor; in step S4, a visual positioning system is used to monitor the mating gap, and when it exceeds 0.1mm, it is adjusted by an electric fine-tuning platform; in step S5, the hydraulic micro-shaping device is equipped with a pressure feedback sensor, and the high-pressure injection device controls the amount of glue added through a flow sensor.

8. The method according to claim 6, characterized in that: In step S1, the cleaning equipment uses a low-temperature plasma cleaner with a cleaning temperature of 50-60℃ and a cleaning time of 30-60 seconds to remove oil stains from the surface of the strip (7) and the oxide layer of the grid claws (2); the phosphating treatment uses a zinc-based phosphating agent with a treatment temperature of 40-50℃ and a treatment time of 10-15 minutes, and a phosphating film of 5-8μm thick is formed on the surface of the composite metal skeleton after phosphating.

9. The method according to claim 6, characterized in that: In step S2, after applying the composite adhesive layer, the strip (7) is placed in a constant temperature and humidity environment for preliminary curing. The ambient temperature is controlled at 25±3℃, the relative humidity is 60%-70%, and the preliminary curing time is 30-45 minutes. After the surface of the composite adhesive layer is no longer sticky, step S3 is then entered. The width of the adhesive outlet of the adhesive head is matched with the width of the strip (7), and the adhesive dispensing speed is synchronized with the moving speed of the six-axis robotic arm.

10. The method according to claim 6, characterized in that: After locking the S4 clamp, inject weather-resistant sealant into the gap between the U-shaped groove (8) and the grid claw (2) using a high-pressure injection device. The injection pressure is 1.5-2.0 MPa. After injection, let it stand for 1-2 hours. If the component is used in a cold region, preheat the mating area before injecting the sealant to ensure that the sealant is fully adhered to the surface of the component.

Images