A method for repairing surface defects of rail vehicle floor cloth

Abstract

The present invention provides a method for repairing surface defects of rail vehicle floor cloths, determining the type of surface defect of the rail vehicle floor cloth to be repaired; if it is a bulge, exhaust the air in the bulge area, inject glue into the bulge area, and press for a period of time; if it is a scratch, use a sealant that matches the color of the floor cloth to smooth out mild scratches, or polish and repair deep scratches, and use the powder after polishing and structural adhesive to mix and smooth out the scratches; if it is a tear or a bulge, remove a certain range of floor cloth at the tear or bulge, press the floor cloth, and then perform alignment bonding. The present invention can quickly and conveniently repair defects on the surface of rail vehicle floor cloths in different scenarios, achieve the effect of surface renovation, and avoid waste of floor cloth materials.

Description

Technical Field

[0001] The invention belongs to the technical field of floor cloth surface repair, and in particular relates to a method for repairing surface defects of a rail vehicle floor cloth. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] With the rapid development of rail vehicles and the application of new materials, higher requirements have been put forward for rail vehicle floor cloths in terms of internal performance, appearance, color and pattern, comfort, durability, etc. At present, rail vehicle floor cloths are made of PVC (polyvinyl chloride), TPU (thermoplastic polyurethane) and rubber materials, all of which are polymer mixed products with good plasticity, low hardness, excellent stepping comfort and wear resistance, which can meet the needs of rail vehicle floor protection.

[0004] Because floor cloths are made of polymer plastics, during the operation of rail vehicles, affected by the environment, body vibration and other external factors, the surface of the floor cloth will inevitably form scratches, aging and discoloration, bulges, bulges, loss of gloss, and even damage pits, which seriously affect the visual effect of passengers. In particular, high-speed EMUs have higher requirements for the decorative effect and appearance of the interior of the car, and each factory repair and section repair requires inspection. In the past, the method of cutting and replacing floor cloths was generally used for repair. Not only was there a certain color difference between the new and old floor cloths, but the splicing process would add several irregular welds, affecting the appearance quality; at the same time, the replacement of floor cloths required the removal of parts and wall panels in the car, which increased the maintenance workload and maintenance cycle, and even caused more maintenance content due to replacement, and also caused waste of floor cloth materials. Summary of the invention

[0005] In order to solve the above problems, the present invention proposes a method for repairing surface defects of railway vehicle floor cloths. The present invention can quickly and conveniently repair surface defects of railway vehicle floor cloths in different scenarios, achieve the effect of surface renovation, and avoid waste of floor cloth materials.

[0006] According to some embodiments, the present invention adopts the following technical solutions:

[0007] A method for repairing surface defects of a railway vehicle floor cloth comprises the following steps:

[0008] Determine the type of surface defects on the rail vehicle floor cloth to be repaired;

[0009] If it is a bulge, remove the air from the bulge area, inject glue into the bulge area, and press for a while;

[0010] If it is a scratch, use a sealant that matches the color of the floor cloth to smooth out light scratches, or sand and repair deep scratches, and use the powder from the sanding to mix with structural glue to smooth out the scratches;

[0011] If there is a tear or a bulge, remove a certain range of the floor cloth at the tear or bulge, press the floor cloth, and then glue it in place.

[0012] As an optional implementation, if it is a bulge and the size of the bulge is within a set range, use a sharp object to pierce the floor cloth to release the internal gas or extract the air in the bulge, inject instant glue into the area for bonding, and press for a while after the instant glue repair.

[0013] As an optional implementation, if it is a bulge and the size of the bulge exceeds the set range, use a cutting tool to cut a small hole in the middle of the bulge area, inject self-leveling structural adhesive into the bulge area, and press the area for a period of time.

[0014] As an optional implementation, the self-leveling structural adhesive is a two-component transparent adhesive with a main agent and a curing agent volume ratio of 1:1. It is one of epoxy and polyurethane, has a bonding strength to the rubber floor cloth that is higher than the set value, has a mixed viscosity of 6000-20000mPa.s, an operating time of 10 to 30 minutes, and should lose self-leveling properties after mixing for 30 minutes. The Shore A hardness is 50 to 80.

[0015] As an optional implementation method, the specific process of smoothing minor scratches includes: using sealant to repair the scratched area, mixing the sealant with pigment in advance according to the color requirements of the floor cloth, so that the color of the sealant is close to or consistent with the color of the surface of the floor cloth, adhering tape on both sides of the scratched area, with the edge of the tape close to the edge of the scratched area, scraping and applying the prepared sealant to the scratched area of ​​the floor cloth, and smoothing it out, removing the tape after smoothing is completed, and applying oil to the surface of the sealant after the sealant is dry, and the color of the oil is consistent with the color of the flowers on the surface of the floor cloth.

[0016] As a further limitation, the sealant is a flexible moisture-curing sealant, which is one of polyurethane and silane.

[0017] As an optional implementation method, the repair process for deep scratches includes: using floor cloth polishing powder for repair, polishing the back of floor cloth scraps from the same batch, collecting the polished floor cloth powder, and fully mixing it with transparent AB structural adhesive to obtain a cotton-like filler after mixing, gluing smooth tape on both sides of the scratch, with the edge of the tape close to the edge of the scratch, scraping the filler on the scratched area of ​​the floor cloth, and smoothing it, sprinkling a thin layer of polishing powder on the surface, and after the filler is dry, polishing the surface of the filler to make it matte and flat, and tearing off the tape on the surface, wiping the repaired area with matte wax, and applying oil to the repaired surface, and the color of the oil is consistent with the color of the flowers on the surface of the floor cloth.

[0018] As a further limitation, the AB structural adhesive is transparent, has an open time of 40 to 60 minutes, and is composed of one of acrylic acid and epoxy.

[0019] As an optional implementation method, the repair process of a tear or a drum nail specifically includes: repairing by seamless splicing, marking the tear or the drum nail, punching the drum nail, taking out a circular floor cloth of a certain diameter, applying the floor cloth adhesive to the circular hole after repair, and bonding the circular floor cloth to the line at the same time.

[0020] As a further limitation, the circular floor cloth punched out will be warped and deformed, so it is pressed on a flat surface for a set time to release the internal stress caused by the stamping, and then spliced; before splicing the small circular floor cloth, a layer of sealant is applied around the seam, and the surface is wiped after bonding to prevent the penetration of water or detergent.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention can quickly and conveniently repair defects on the surface of rail vehicle floor cloths in different scenarios, achieve the effect of surface renovation, and avoid waste of floor cloth materials.

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0025] Figure 1 is a schematic diagram of the process of this embodiment;

[0026] Figure 2 This is a schematic diagram of the deep scratch repair process of this embodiment;

[0027] Figure 3 Schematic diagram of the drum nail repair process of this embodiment. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0029] It should be noted that the following detailed descriptions are all illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0030] A method for repairing surface defects of a railway vehicle floor cloth, such as Figure 1 As shown, the following steps are included:

[0031] Determine the type of surface defects on the rail vehicle floor cloth to be repaired;

[0032] If it is a bulge, remove the air from the bulge area, inject glue into the bulge area, and press for a while;

[0033] If it is a scratch, use a sealant that matches the color of the floor cloth to smooth out light scratches, or sand and repair deep scratches, and use the powder from the sanding to mix with structural glue to smooth out the scratches;

[0034] If there is a tear or a bulge, remove a certain range of the floor cloth at the tear or bulge, press the floor cloth, and then glue it in place.

[0035] Among them, bulge repair includes small bulge repair and large bulge repair.

[0036] The method for repairing bulges is as follows: For the bulged area (bulging range ≤ (30×30) mm), use a shaving needle to pierce the floor cloth to release the internal gas or use a syringe to extract the air in the bulge, and then use a (20-30) mL syringe to inject instant glue into the area for bonding. After the instant glue repair, press the area by hand for more than 1 minute, and then use a sandbag to press for 1 hour.

[0037] The method for repairing large blisters is as follows: For the bulged area (bubble range > (30×30) mm), first use a wallpaper knife to cut a small hole in the middle of the bulged area, use a two-component glue gun to assemble the self-leveling structural glue, aim the glue nozzle at the cut of the floor cloth and pull the trigger of the glue gun to inject the structural glue into the bulged area. After the injection, press the area by hand for more than 1 minute, and then use a sandbag to press for more than 3 hours.

[0038] The self-leveling structural adhesive used is a two-component transparent adhesive with a main agent and a curing agent volume ratio of 1:1. It can be one of epoxy and polyurethane. It has a certain bonding strength to the rubber floor cloth and is not less than 1.0MPa. The mixed viscosity is 6000-20000mPa.s, and the operating time is 10 to 30min. After mixing for 30min, the self-leveling property should be lost. The Shore A hardness is 50 to 80. It can achieve a certain adhesion to the above-mentioned substrates within 24h without any corrosion reaction.

[0039] The method for repairing minor scratches is as follows: Use soft elastic sealant to repair the scratches. The main body of the sealant is gray or white. According to the color requirements of the floor cloth, the sealant is pre-mixed with yellow, black, red, and green pigments. After mixing, ensure that the color of the sealant is close to or consistent with the surface color of the floor cloth. Stick smooth tape on both sides of the scratch, with the edge of the tape close to the edge of the scratch. Then use a scraper to scrape the prepared sealant on the scratched area of ​​the floor cloth and smooth it out. After smoothing, tear off the tape. After the sealant has dried for 24 hours, use a fine brush to apply oil to the surface of the sealant for repair. The color of the oil should be consistent with the color of the flowers on the surface of the floor cloth.

[0040] Gray or white sealant is a soft elastic moisture curing sealant, which can be one of polyurethane and silane. It has a certain bonding strength to the rubber floor cloth. According to the DIN54457 standard, the cohesive failure degree of the sealant on the floor cloth surface at each stage is more than 75%.

[0041] The method for repairing deep scratches is as follows: Use floor cloth polishing powder for repair, use a polishing machine with 1500# sandpaper to polish the back of the same batch of floor cloth scraps, collect the polished floor cloth powder, and then mix it with transparent AB structural adhesive to obtain a cotton-like filler. Adhere smooth tape to both sides of the scratch, and the edge of the tape is close to the edge of the scratch. Then use a scraper to scrape the filler on the scratch of the floor cloth and smooth it. Finally, sprinkle a thin layer of polishing powder on the surface. After the filler dries for 24 hours, use 400# sandpaper to polish the surface of the filler to make it flat and glossy, and tear off the tape on the surface. Use a rag to apply matte wax to wipe the repaired area, and finally use a fine brush to apply oil to the repaired surface. The color of the oil is consistent with the color of the flowers on the floor cloth surface.

[0042] AB structural adhesive is transparent, with an open time of 40 to 60 minutes. It is composed of one of acrylic and epoxy ingredients. It has sufficient bonding strength for rubber floor cloth. Tested according to GB / T2790 standard, the 180° peel strength is above 2.5N / mm.

[0043] The method for repairing a tear or a bulge is as follows: Use seamless splicing to repair, first mark the tear or bulge, then use a hollow punch puncher to punch the bulge, the punching diameter is 12mm~15mm, take out a small piece of round floor cloth, and after the screws are repaired, apply the floor cloth adhesive to the round hole, and at the same time, glue the round floor cloth to the line. The round floor cloth taken out by punching will be warped and deformed, so it needs to be pressed on a flat surface for 24 hours to release the internal stress caused by the punching, and then splice it. To prevent water seepage in the seams, apply a layer of sealant around the seams of the small round floor cloth before splicing, and wipe the surface after bonding to ensure that the gap is sealed and filled to prevent water or detergent from penetrating.

[0044] Of course, the above-mentioned parameters can be adjusted or changed according to the specific material, ambient temperature, humidity and other specific conditions in the actual practice.

[0045] The above process can realize the repair of surface defects of different types of floor cloths. The surface defects of floor cloths are repaired by the method of the present invention to achieve the effect of surface refurbishment, thereby avoiding the expansion of the maintenance vehicle dismantling process, the extension of the maintenance cycle, and the waste caused by replacing the floor cloth.

[0046] The following takes deep scratches and drum nail repair as an example and explains with reference to the accompanying drawings. Figure 2 The picture shows the repair of deep scratches. According to the method of the present invention, the deep scratch area is repaired. First, the back of the floor cloth scraps of the same batch is polished with a polishing machine equipped with 1500# sandpaper, and the polished floor cloth powder is collected. Then, it is fully mixed with transparent AB structural adhesive to obtain a cotton-like filler. The smooth tape is adhered to both sides of the scratch, and the edge of the tape is close to the edge of the scratch. Then, the filler is scraped and applied to the scratched part of the floor cloth with a scraper, and it is smoothed. Finally, a thin layer of polishing powder is sprinkled on the surface. After the filler is dried for 24 hours, the surface of the filler is polished with 400# sandpaper to make it glossy and flat, and the tape on the surface is torn off. The repaired part is wiped with a rag with matte wax. The color difference after repair is small, which meets the requirements. Under the condition of indoor illumination of not less than 161lux, there is no obvious color difference and repair marks when sitting on a 432mm bench.

[0047] Figure 3This is a picture showing the repair process of the drum nail. According to the method of the present invention, the drum nail repair is firstly marked on the rupture or drum nail, and then the drum nail is punched with a hollow punch puncher, with a punching diameter of 12mm to 15mm. A small piece of round floor cloth is taken out, and after the screws are repaired, the floor cloth adhesive is applied to the round hole, and the round floor cloth is aligned and bonded at the same time. The round floor cloth taken out by punching is warped and deformed, so it needs to be pressed on a plane for 24 hours to release the internal stress caused by the punching, and then spliced. There is no color difference after the repair. Under the condition of indoor illumination not less than 161lux, no obvious seams can be seen when sitting on a 432mm bench to observe the repaired area visually.

[0048] Of course, the above-mentioned parameters can be adjusted or changed according to the specific material, ambient temperature, humidity and other specific conditions in the actual practice.

[0049] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A method for repairing surface defects of a railway vehicle floor cloth, characterized in that: The following steps are involved: Determine the type of surface defects on the rail vehicle floor cloth to be repaired; If it is a bulge, remove the air from the bulge area, inject glue into the bulge area, and press for a while; If it is a scratch, use a sealant that matches the color of the floor cloth to smooth out light scratches, or sand and repair deep scratches, and use the powder from the sanding to mix with structural glue to smooth out the scratches; If it is a tear or a bulging nail, remove a certain range of the floor cloth at the tear or bulging nail, and then apply the floor cloth adhesive to the circular hole after the screw is repaired. After pressing the floor cloth, align the circular floor cloth and glue it; The repair process for deep scratches includes: using floor cloth polishing powder for repair, polishing the back of the floor cloth scraps from the same batch, collecting the polished floor cloth powder, mixing it with transparent AB structural adhesive, and obtaining a cotton-like filler after mixing. Glossy tape is adhered to both sides of the scratch, and the edge of the tape is close to the edge of the scratch. The filler is scraped and applied to the scratched area of ​​the floor cloth, and smoothed, and a thin layer of polishing powder is sprinkled on the surface. After the filler is dry, the surface of the filler is polished to make it matte and flat, and the tape on the surface is torn off. The repaired area is wiped with matte wax, and oil is applied to the repaired surface. The color of the oil is consistent with the color of the sprinkled flowers on the surface of the floor cloth.

2. A method for repairing surface defects of a railway vehicle floor cloth as claimed in claim 1, characterized in that: If it is a bulge and the size of the bulge is within the set range, use a sharp object to pierce the floor cloth to release the internal gas or extract the air in the bulge, inject instant glue into the area for bonding, and press for a while after the instant glue repair.

3. A method for repairing surface defects of a railway vehicle floor cloth as claimed in claim 1, characterized in that: If it is a bulge and the size of the bulge exceeds the set range, use a cutting tool to cut a small hole in the middle of the bulge area, inject the self-leveling structural adhesive into the bulge area, and press the area for a while.

4. A method for repairing surface defects of a railway vehicle floor cloth as claimed in claim 3, characterized in that: The self-leveling structural adhesive is two-component and transparent, with a main agent and a curing agent volume ratio of 1:

1. It is one of epoxy resin type structural adhesive and polyurethane type structural adhesive. It has a bonding strength to rubber floor cloth that is higher than a set value, a mixed viscosity of 6000-20000 mPa·s, an operable time of 10 to 30 minutes, and should lose self-leveling properties after mixing for 30 minutes. The Shore A hardness is 50 to 80.

5. A method for repairing surface defects of a railway vehicle floor cloth as claimed in claim 1, characterized in that: The specific process of smoothing minor scratches includes: using sealant to repair the scratched area, mixing the sealant with pigment in advance according to the color requirements of the floor cloth, so that the color of the sealant is close to or consistent with the color of the surface of the floor cloth, adhering tape on both sides of the scratched area, with the edge of the tape close to the edge of the scratch, scraping the prepared sealant on the scratched area of ​​the floor cloth, and smoothing it out, removing the tape after smoothing is completed, and applying oil to the surface of the sealant after the sealant is dry, and the color of the oil should be consistent with the color of the flowers on the surface of the floor cloth.

6. A method for repairing surface defects of a railway vehicle floor cloth as claimed in claim 1, characterized in that: The AB structural adhesive is transparent, has an open time of 40 to 60 minutes, and is composed of one of an acrylic structural adhesive and an epoxy resin structural adhesive.

7. A method for repairing surface defects of a railway vehicle floor cloth as claimed in claim 1, characterized in that: The repair process of a tear or a bulge includes: repairing by seamless splicing, marking the tear or the bulge, punching the bulge, taking out a circular floor cloth of a certain diameter, applying the floor cloth adhesive to the circular hole after the repair, and aligning the circular floor cloth.

8. A method for repairing surface defects of a railway vehicle floor cloth as claimed in claim 7, characterized in that: The round floor cloth taken out by punching is warped and deformed, so it is pressed on a flat surface for a set time to release the internal stress caused by punching, and then spliced; Before splicing the small round floor cloth, apply a layer of sealant around the seams. After bonding, wipe the surface to prevent water or detergent from penetrating.

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