Sealing method for seam between car roof and front and rear walls

Abstract

The invention discloses a sealing method for a seam between a car roof and front and rear walls. According to the sealing method for the seam between the car roof and the front and rear walls, a top framework, a front wall top framework and a rear wall top framework are included, and the front wall top framework and the rear wall top framework are arranged on the two sides of the top framework; the front end and the rear end of a top skin on the top framework extend out of the top framework, and the extending ends of the top skin are turned upwards. A front wall skin of the front wall top framework and a rear wall skin of the rear wall top framework are located below the top skin extending end. First sealant is smeared between the top skin and the front wall skin as well as between the top skin and the rear wall skin, and turned edges of the top skin are knocked to the front wall skin and the rear wall skin; and second sealant is smeared on the surfaces of the top skin, the front wall skin and the rear wall skin. According to the sealing method for the car roof and the front and rear wall joint, the extending end of the top skin is additionally arranged, the top skin extending out of the extending end is pressed on the first sealant, the extrusion effect is formed to enable the first sealant to overflow into the gap, then a layer of second sealant is coated to cover the lap joint, and double leakage prevention is formed.

Description

Technical Field

[0001] The invention belongs to the field of sealing joints between a vehicle roof and front and rear enclosures, and in particular relates to a sealing method for joints between a vehicle roof and front and rear enclosures. Background Art

[0002] At present, when sealing the joints between the roof and the front and rear enclosures, a commonly used sealing method is to apply a layer of sealant on the joints as a sealing layer. However, after the bus has been running for a period of time, the connecting welds between the roof frame and the front and rear enclosure frames may rust, resulting in the risk of water seepage in the vehicle.

[0003] The rust on the connecting welds between the top frame and the front and rear surround frames will affect the body structure and the quality of the vehicle. The water seepage on the connecting welds between the top frame and the front and rear surround frames not only increases the difficulty and cost of after-sales maintenance, but also affects the customer's experience of using the vehicle.

[0004] Therefore, it is urgent to design a sealing method for the joints between the roof and the front and rear enclosures to solve the above problems. Summary of the invention

[0005] In order to solve the technical problem mentioned in the background technology that the rust of the connecting welds between the top frame and the front and rear enclosure frames will affect the body structure and the quality of the whole vehicle, a sealing method for the joints between the roof and the front and rear enclosures is provided to solve the problem of water seepage in the joints between the roof and the front and rear enclosures.

[0006] To achieve the above-mentioned purpose, the specific technical scheme of the sealing method of the roof and the front and rear enclosure seams of the present invention is as follows: A method for sealing the joints between a vehicle roof and front and rear enclosures comprises a roof frame, a front enclosure top frame and a rear enclosure top frame, wherein the front enclosure top frame and the rear enclosure top frame are arranged on both sides of the roof frame; the front and rear ends of a roof skin on the roof frame extend out of the roof frame, and the extended ends of the top skin are both turned up; the front enclosure skin of the front enclosure top frame and the rear enclosure skin of the rear enclosure top frame are located below the extended ends of the top skin; a first sealant is applied between the top skin and the front enclosure skin and the rear enclosure skin, and the flanges of the top skin are knocked onto the front enclosure skin and the rear enclosure skin; a second sealant is applied to the surfaces of the top skin and the front enclosure skin and the rear enclosure skin.

[0007] Furthermore, the length of the front and rear extended ends of the top skin is 28-30 mm, and the root of the flange of the top skin is along the outer facade of the top frame, and the extended end of the top skin is folded upward.

[0008] Furthermore, the front and rear enclosure skins are respectively located below the roots of the flanges at both ends of the top enclosure skin.

[0009] Further, the upper surfaces of the front and rear enclosure skins close to the top enclosure skin flange are cleaned, and a first sealant is applied to the upper surfaces of the front and rear enclosure skins.

[0010] Furthermore, one side of the raised flange of the top skin is in contact with a pad, and the pad is struck to make the flanges at both ends of the top skin fit onto the front and rear enclosure skins along the roots of the flanges.

[0011] Furthermore, after knocking once along the middle of the top skin flange to both sides, knock again from the middle of the top skin flange to both sides, folding the top skin flange down 10-12mm each time, until the top skin flange is knocked to fit with the side of the front and rear skins coated with the first sealant.

[0012] Furthermore, the non-fitting gap between the top skin flange and the front and rear wall skins is less than 1.5 mm, and the first sealant overflowing from the interlayer between the top skin flange and the front and rear wall skins is removed.

[0013] Furthermore, first protective papers are pasted on the front and rear enclosure skins, and the two first protective papers are no less than 10 mm away from the edge of the top skin flange; second protective papers are pasted on both ends of the top skin, and the two second protective papers are no less than 10 mm away from the root of the top skin flange.

[0014] Furthermore, two strips of second sealant are applied along one side of the first protective paper and the second protective paper close to the top skin flange, and the width of the two strips of second sealant is not less than 10 mm and the height is not less than 12 mm.

[0015] Furthermore, two second sealants are squeezed into an arc shape through the rubber plate, and then the second sealants are scraped from both sides to the middle, so that the thickness of the glue surface between the first protective paper and the second protective paper is 3-5mm.

[0016] The sealing method of the roof and the front and rear enclosure seams of the present invention has the following advantages: By adding an extended end of the top skin, a first sealant is first applied at the joint of the front and rear skins, and then the top skin extending from the extended end is pressed on the first sealant to form an extrusion effect so that the first sealant overflows into the gap, and then the top skin extending from the extended end is fixed, and finally a layer of second sealant is applied to cover and seal the lap joint to form a double leak-proof. The application enhances the anti-seepage function, solves the problem of weld rust caused by leakage or seepage, and improves product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the position of the top skin and the top frame of the sealing method of the joint between the roof and the front and rear enclosures of the present invention; Figure 2 A schematic diagram of the flange root of the sealing method for the seam between the roof and the front and rear enclosures of the present invention; Figure 3 A schematic diagram of applying the first sealant in the sealing method of the joint between the roof and the front and rear enclosures of the present invention; Figure 4The diagram is a schematic diagram of applying the second sealant of the sealing method for the joint between the roof and the front and rear enclosures of the present invention.

[0018] Description of the markings in the figure: 1. Top skin; 11. Flanged edge; 12. Root of flanging edge; 2. Top frame; 21. External surface of top frame; 3. Rear top frame; 4. Rear skin; L1, the extension length of the top skin; L2, the first sealant; L3, the second sealant. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0020] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0021] Please refer to the attached Figure 1 To Attachment Figure 4 The sealing method of the joint between the roof and the front and rear panels of the vehicle is described.

[0022] like Figure 1 As shown, the sealing method of the joint between the roof and the front and rear enclosures in the present invention includes a top frame 2, a front enclosure top frame and a rear enclosure top frame 3, wherein the front enclosure top frame and the rear enclosure top frame 3 are arranged on both sides of the top frame 2; the front and rear ends of the top skin 1 on the top frame 2 extend out of the top frame 2, and the extended ends of the top skin 1 are both turned up; the front enclosure skin of the front enclosure top frame and the rear enclosure skin 4 of the rear enclosure top frame 3 are located below the extended ends of the top skin 1; a first sealant is applied between the top skin 1 and the front enclosure skin and the rear enclosure skin 4, and the flange 11 of the top skin 1 is knocked onto the front enclosure skin and the rear enclosure skin 4; a second sealant is applied to the surfaces of the top skin 1 and the front enclosure skin and the rear enclosure skin 4.

[0023] By adding an extended end of the top skin 1, a first sealant is first applied at the joint of the front and rear skins 4, and then the top skin 1 extending out of the extended end is pressed on the first sealant to form an extrusion effect so that the first sealant overflows into the gap, and then the top skin 1 extending out of the extended end is fixed, and finally a layer of second sealant is applied to cover and seal the overlapped seam to form a double leak-proof method.

[0024] Further, if Figure 1 and Figure 2 As shown, the length of the front and rear protruding ends of the top skin 1 is 28-30 mm, and the flange root 12 of the top skin 1 is along the outer facade of the top frame 2, and the protruding end of the top skin 1 is folded upward; the front surrounding skin and the rear surrounding skin 4 are respectively located below the flange roots 12 at both ends of the top skin 1; clean the upper surface of the front surrounding skin and the rear surrounding skin 4 close to the top skin flange 11, and apply a first sealant on the upper surface of the front surrounding skin and the rear surrounding skin 4.

[0025] In this embodiment, the sealing method between the front and rear enclosure skins 4 and the top enclosure skin 1 is the same, so the sealing method between the rear enclosure skin 4 and the top enclosure skin 1 is mainly introduced below.

[0026] Preferably, the top skin 1 is arranged on the upper surface of the top frame 2, and the length of the top skin 1 extending out of the end of the top frame 2 is 28-30 mm, and the length of the end of the top frame 2 is denoted as L1. The extended end of the top skin 1 is a flange root 12 along the outer surface of the top frame 2, so that the extended top skin 1 is folded upward to form a flange 11, and the flange angle is controlled to 80-90 degrees, and the burrs on the flange 11 are cleaned.

[0027] A rear enclosure top frame 3 is provided on the lower surface of the top frame 2, and a rear enclosure skin 4 is provided on the rear enclosure top frame 3. The end of the rear enclosure skin 4 is close to the root 12 of the top skin flange, that is, the rear enclosure skin 4 is located below the root 12 of the top skin flange, close to the flange 11 of the top skin 1; the rear enclosure skin 4 is fixed to the rear enclosure top frame 3 by a first rivet.

[0028] Preferably, first clean the joint between the top frame 1 and the rear top frame 3, use an activator to clean dust and oil stains along the joint gap, and clean a width greater than 40 mm on both sides of the gap. The 28-30 mm width of the contact surface between the flange 11 of the top skin 1 and the rear skin 4 must be completely cleaned. After drying for 3-5 minutes, apply the first sealant on the upper surface of the rear skin. The first sealant is 7 mm wide and 7 mm thick. The size of the first sealant is recorded as L2, and the application direction of the first sealant is the width direction of the rear skin 4.

[0029] Further, if Figure 3As shown, the raised side of the flange 11 of the top skin 1 is against a pad, and the pad is knocked to make the flanges 11 at both ends of the top skin 1 fit on the front and rear surrounding skins 4 along the flange roots 12; knock once from the middle of the top skin flange 11 to both sides, and then knock from the middle of the top skin flange 11 to both sides, each time the top skin flange 11 is knocked, it is folded down 10-12mm until the top skin flange 11 is knocked to fit with the side of the front and rear surrounding skins 4 coated with the first sealant; the non-fitting gap between the top skin flange 11 and the front and rear surrounding skins 4 is less than 1.5mm, and the first sealant overflowing from the interlayer between the top skin flange 11 and the front and rear surrounding skins 4 is removed.

[0030] In this embodiment, the pad is pressed on the raised side of the flange. Preferably, the pad is a rectangular plate with a size of 50 mm in length, 80 mm in width and 5 mm in height. The pad is hit with a hammer to thereby achieve the hitting of the top skin flange 11. The pad protects the top skin flange 11 during the hitting process to prevent the top skin flange 11 from being directly hit.

[0031] Preferably, when knocking the pad on the top skin flange 11, knock once along the middle of the top skin flange 11 to both sides to ensure that the top skin flange 11 is folded down 10-12 mm, and then knock the top skin flange 11 from the middle to both sides again, and the top skin flange 11 is folded down 10-12 mm again. After multiple knocks, the non-fitting gap between the top skin flange 11 and the rear surrounding skin 4 is less than 1.5 mm, and the top skin flange 11 and the rear surrounding skin 4 are fixed to the rear surrounding top frame 3 by the second rivet.

[0032] Knock the flange 11 of the top skin 1 several times to make the top skin flange 11 fit with the rear surrounding skin 4, fix the top skin flange 11, apply the first sealant on the rear surrounding skin 4, and after being squeezed by the top skin flange 11, the first sealant overflows into the gap to form a first leak-proof structure, and then clean the residual glue overflowing from the interlayer.

[0033] Further, if Figure 4 As shown, the first protective papers are pasted on the front and rear enclosure skins 4, and the two first protective papers are not less than 10mm away from the edge of the flange 11 of the top skin 1; the second protective papers are pasted on both ends of the top skin 1, and the two second protective papers are not less than 10mm away from the root 12 of the flange of the top skin 1; two strips of second sealant are applied along the first and second protective papers close to the flange 11 of the top skin 1, and the width of the two second sealants is not less than 10mm, and the height is not less than 12mm; the two second sealants are squeezed into an arc shape through a rubber sheet, and then the second sealant is scraped from both sides to the middle, so that the glue surface thickness between the first and second protective papers is 3-5mm.

[0034] In this embodiment, preferably, a first protective paper is first pasted on the rear skin 10 mm away from the end of the top skin flange 11, and a second protective paper is pasted on the top skin 10 mm away from the bending position of the top skin flange 11. The spacing between the first protective paper and the second protective paper is 50 mm, and the spacing between the first protective paper and the second protective paper is uniform.

[0035] Clean the space between the first protective paper and the second protective paper with a cleaning agent. After drying for 3-5 minutes, apply two strips of the second sealant with a width of 10mm and a height of 12mm between the first protective paper and the second protective paper. The distance between each strip of the second sealant and the first protective paper and the second protective paper is 15mm. Keep the pressure and speed balanced to make the second sealant uniform, uniform and continuous in width.

[0036] Use a rubber plate to squeeze the second sealant into an arc shape, and then scrape the second sealant from both sides to the middle to ensure that the thickness of the second sealant between the first protective paper and the second protective paper is 3 to 5 mm. The second sealant between the first protective paper and the second protective paper is recorded as L3.

[0037] Before the adhesive surface of the second sealant is completely air-dried, tear off the first protective paper and the second protective paper; when tearing off the first protective paper and the second protective paper, tear them along the direction of the second sealant and toward the adhesive surface, that is, tear them from the side of the first protective paper and the second protective paper away from the second sealant to avoid tearing the adhesive surface of the second sealant.

[0038] After checking and trimming the scraper again, use your hands dipped in a neutral detergent diluted solution (6-10% dilution concentration) to trim the defects on the surface of the second sealant to make the entire surface of the second sealant smooth and the thickness uniform. Wipe off the remaining diluted solution with a cotton cloth. At this point, the second leak-proof structure is laid.

[0039] The sealing method based on the joint between the roof and the front and rear enclosures is achieved by adding an extended end of the top skin 1, first applying a line of first sealant at the joint between the front enclosure skin and the rear enclosure skin 1, and then pressing the top skin flange 11 extending from the extended end onto the first sealant to form an extrusion effect so that the first sealant overflows into the gap, and then fixing the top skin flange 11 extending from the extended end, and finally applying a layer of second sealant to cover and seal the overlapped seam to form a double leak-proof method.

[0040] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A method for sealing the joints between a roof and front and rear enclosures, characterized in that: It includes a top frame, a front enclosure top frame and a rear enclosure top frame, wherein the front enclosure top frame and the rear enclosure top frame are arranged on both sides of the top frame; Front and rear ends of the top skin on the top frame extend out of the top frame, and the extended ends of the top skin are turned up; The front cowl skin of the front cowl top frame and the rear cowl skin of the rear cowl top frame are located below the extended end of the top skin; Apply the first sealant between the top skin and the front and rear skins, and knock the flange of the top skin onto the front and rear skins; Apply the second sealant on the surface of the top skin, the front skin and the rear skin.

2. The method for sealing the joint between the roof and the front and rear enclosures according to claim 1, characterized in that: The length of the front and rear extended ends of the top skin is 28-30 mm. The root of the flange of the top skin is along the outer facade of the top frame, and the extended end of the top skin is folded upward.

3. The sealing method for the joint between the roof and the front and rear enclosures according to claim 1, characterized in that: The front skin and the rear skin are respectively located below the roots of the flanges at both ends of the top skin.

4. The method for sealing the joint between the roof and the front and rear enclosures according to claim 3, characterized in that: Clean the upper surface of the front and rear skins close to the top skin flange, and apply a line of the first sealant on the upper surfaces of the front and rear skins.

5. The method for sealing the joint between the roof and the front and rear enclosures according to claim 1, characterized in that: One side of the raised flange of the top skin is in contact with a pad, and the pad is knocked to make the flanges at both ends of the top skin fit on the front and rear surrounding skins along the roots of the flanges.

6. The method for sealing the joint between the roof and the front and rear enclosures according to claim 5, characterized in that: After knocking once along the middle of the top skin flange to both sides, knock again from the middle of the top skin flange to both sides, folding the top skin flange down 10-12mm each time you knock, until the top skin flange is fit with the side of the front and rear skin coated with the first sealant.

7. The method for sealing the joint between the roof and the front and rear enclosures according to claim 6, characterized in that: The non-fitting gap between the top skin flange and the front and rear skins is less than 1.5 mm, and the first sealant overflowing from the interlayer between the top skin flange and the front and rear skins is removed.

8. The method for sealing the joint between the roof and the front and rear enclosures according to claim 1, characterized in that: The first protective paper is pasted on the front and rear skins, and the two first protective papers are no less than 10mm away from the edge of the top skin flange; the second protective paper is pasted on both ends of the top skin, and the two second protective papers are no less than 10mm away from the root of the top skin flange.

9. The method for sealing the joint between the roof and the front and rear enclosures according to claim 8, characterized in that: Two strips of the second sealant are applied along the first and second protective papers close to the top skin flange. The width of the two strips of the second sealant is not less than 10 mm and the height is not less than 12 mm.

10. The method for sealing the joint between the roof and the front and rear enclosures according to claim 9, characterized in that: Two second sealants are squeezed into an arc shape through the rubber plate, and then the second sealants are scraped from both sides to the middle, so that the thickness of the glue surface between the first protective paper and the second protective paper is 3-5mm.

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