CN113488928A - Cable repairing method for rail transit vehicle - Google Patents
Cable repairing method for rail transit vehicle Download PDFInfo
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- CN113488928A CN113488928A CN202110905111.7A CN202110905111A CN113488928A CN 113488928 A CN113488928 A CN 113488928A CN 202110905111 A CN202110905111 A CN 202110905111A CN 113488928 A CN113488928 A CN 113488928A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/16—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for repairing insulation or armouring of cables
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Abstract
The invention discloses a cable repairing method for rail transit vehicles, which is characterized in that the residual thickness of a cable insulating layer at a damaged position (3) of the cable insulating layer is divided into a plurality of levels of defects, and the defects of different levels are repaired by different repairing methods. And dividing the residual thickness of the cable insulating layer at the damaged position (3) of the cable insulating layer into a first-level defect, a second-level defect, a third-level defect and a fourth-level defect, repairing the first-level defect, the second-level defect and the third-level defect, and not repairing the fourth-level defect. The classification of the corresponding defects provides corresponding defect repair techniques, thereby ensuring safe operation of the vehicle and further prolonging the service life of the cable, ensuring short-term reliable use of the product and generating great economic benefits.
Description
Technical Field
The invention relates to a cable repairing method for a rail transit vehicle, and belongs to the technical field of cable repairing.
Background
The rail transit vehicle is a super-large project which integrates the modern leading science and technology, each system is related to the safety and success or failure of driving, and the power supply system is the nerves and blood vessels of the rail transit vehicle and is distributed on the aspect of each carriage. The standard of the cable for the rail transit vehicle is from TB/T1484 to the current EN 50382 high-temperature-resistant power cable, EN 50264 power and control cable and EN 50306 thin-wall insulated control cable, and the cable integrates safety and environmental protection from the aspect of meeting the power supply requirement of the rail transit vehicle, and is a product with the most requirement index items in the cable industry. Even if so, still because on-vehicle equipment is intensive, the cable wiring environment is complicated, there are external damage risks such as cable insulation extrusion, scraping, fish tail, bruise in installation construction and vehicle operation in-process, especially under the condition that the vehicle does not possess the change cable condition, probably threatens the safe operation of vehicle, but if the cost of changing the cable is too high, the cost is huge.
In big data and internet + era, track transportation vehicles manufacturing and designing gradually to intellectuality, automated development, mobile unit quantity also can increase, and the cable quantity also will obviously promote, consequently in limited, narrow and small automobile body space even, the cabling is changeed under the same standard specification and is produced the surface damage risk.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a cable repairing method for a rail transit vehicle, which provides a corresponding defect repairing technology for grading corresponding defects, thereby ensuring the safe operation of the vehicle and further prolonging the service life of the cable, ensuring the short-term reliable use of products and generating great economic benefit.
In order to achieve the above object, the present invention provides a method for repairing a cable for a rail transit vehicle, comprising:
the method comprises the following steps of dividing the residual thickness of the cable insulating layer at the damaged position of the cable insulating layer into a plurality of levels of defects, and repairing the defects of different levels by different repairing methods.
Preferentially, the cable insulation layer residual thickness at the cable insulation layer damage position is divided into a first-level defect, a second-level defect, a third-level defect and a fourth-level defect, the first-level defect, the second-level defect and the third-level defect are all repaired, and the fourth-level defect is not repaired.
Preferentially, the first order defect: the outer surface of the cable has mechanical indentation or discoloration, and the surface of the cable insulating layer is not damaged;
secondary defects: the thickness of the cable insulation layer is reduced due to pits caused by extrusion, cutting, flat pin or needle pricking of the cable, and the residual thickness of the cable insulation layer at the damaged position of the cable insulation layer is not less than 75% of the original thickness of the cable insulation layer;
three-level defects: the thickness of a cable insulating layer is reduced due to pits caused by extrusion, cutting, flat pin or needle pricking of the cable, the residual thickness of the cable insulating layer at the damaged position of the cable insulating layer is not less than 50% of the original thickness of the cable insulating layer, and the residual thickness of the cable insulating layer at the damaged position of the cable insulating layer is less than 75% of the original thickness of the cable insulating layer;
fourth-order defects: the cable is extruded, cut, pinned or needled to form pits, so that the thickness of the cable insulation layer is reduced, the residual thickness of the cable insulation layer at the damaged position of the cable insulation layer is less than 50% of the original thickness of the cable insulation layer, or the damaged position of the cable insulation layer is positioned at a laying stress concentration position comprising a Glan head locking position and a long-term bending position of the cable.
Preferentially, the secondary defects are repaired, including:
in the middle area of the damaged position of the cable insulating layer, after the damaged position of the cable insulating layer is filled up by using a repairing material, the damaged position of the cable insulating layer is directly blown by using a hot drying gun, and finally the damaged position of the cable insulating layer is wrapped by using a semi-stacked winding of a protective material.
Preferably, filling the middle area of the damaged position of the cable insulating layer, wherein the middle area is 8-12mm away from the two ends of the damaged position of the cable insulating layer; directly blowing with a 90-110 deg.C baking gun for 3-7 min; the protective material is 3M anticorrosion adhesive tape.
Preferably, the repair material is a methyl vinyl silicone rubber material employing a dichlorobenzoic peroxide cure system.
Preferably, the three-level defect is repaired, including:
cutting the center of the damaged position of the cable insulating layer into a regular shape along the axial direction of the cable;
cutting a piece of repair material, and uniformly filling and compacting the repair material at the damaged position of the cable insulation layer;
after the repairing material is completely cured, cutting or polishing the repairing material higher than the surface of the cable insulating layer to be flat;
and fixing a protective material for sealing, waterproofing and insulating protection on the repair material.
Preferably, the repair material is a self-curing insulating waterproof protective packaging material, and the protective material is a halogen-free double-wall heat-shrinkable tube;
and a halogen-free double-wall heat-shrinkable tube is sleeved on the repair material, and the halogen-free double-wall heat-shrinkable tube is heated to be completely shrunk by using a heat drying gun.
Preferentially, the center of the damaged position of the cable insulation layer is cut into a circular, triangular or rectangular shape along the axial direction of the cable;
cutting into a circular shape, wherein the circular shape is 10mm in height and 5mm in diameter, and the length and width of the cut repair material are 15mm multiplied by 10 mm; the halogen-free double-walled heat-shrinkable tube was 20mm long, and the halogen-free double-walled heat-shrinkable tube was completely shrunk using a heat gun at 125 ℃.
Preferentially, after the repair material is completely cured within 72 hours at room temperature, cutting or polishing the packing material higher than the surface of the cable by using an art designer knife and abrasive paper; the repairing material is a self-curing insulating waterproof protective packing material, the protective material is 3M anticorrosive adhesive tape, and the repairing material is wound and wrapped by the protective material in a semi-overlapping mode.
The invention achieves the following beneficial effects:
a method for classifying the defects of the cable of the rail transit vehicle is provided, and corresponding defect repairing technology is provided for classifying the corresponding defects, so that the safe operation of the vehicle is ensured, the service life of the cable is further prolonged, the short-term reliable use of the product is ensured, and great economic benefits are generated.
Drawings
Fig. 1 is a structural view of the present apparatus.
Reference in the drawings, 1-cable conductor; 2-cable insulation layer; 3-cable insulation layer damage position; 4-repair material; 5-protective material. Detailed Description
The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
It should be noted that the terms "central," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the scope of the invention.
The invention comprises a cable defect classification method and a cable defect repair technology, wherein the cable defect classification method comprises the following steps: the defect of the cable is divided into four grades according to the residual insulation thickness of the damaged cable, and the defect repairing technology is used for repairing the defect of the damaged cable by four different grades by different repairing methods. The cable comprises a cable conductor 1 and a cable insulating layer 2, wherein the cable insulating layer 2 is coated on the cable conductor 1.
A cable repairing method for a rail transit vehicle comprises the following steps:
the method comprises the following steps of dividing the residual thickness of the cable insulating layer at the damaged position of the cable insulating layer into a plurality of levels of defects, and repairing the defects of different levels by different repairing methods.
And further, dividing the residual thickness of the cable insulating layer at the damaged position of the cable insulating layer into a first-level defect, a second-level defect, a third-level defect and a fourth-level defect, repairing the first-level defect, the second-level defect and the third-level defect, and not repairing the fourth-level defect.
Further, the first order defects: the outer surface of the cable has mechanical indentation or discoloration, and the surface of the cable insulating layer is not damaged;
secondary defects: the thickness of the cable insulation layer is reduced due to pits caused by extrusion, cutting, flat pin or needle pricking of the cable, and the residual thickness of the cable insulation layer at the damaged position of the cable insulation layer is not less than 75% of the original thickness of the cable insulation layer;
three-level defects: the thickness of a cable insulating layer is reduced due to pits caused by extrusion, cutting, flat pin or needle pricking of the cable, the residual thickness of the cable insulating layer at the damaged position of the cable insulating layer is not less than 50% of the original thickness of the cable insulating layer, and the residual thickness of the cable insulating layer at the damaged position of the cable insulating layer is less than 75% of the original thickness of the cable insulating layer;
fourth-order defects: the cable is extruded, cut, pinned or needled to form pits, so that the thickness of the cable insulation layer is reduced, the residual thickness of the cable insulation layer at the damaged position of the cable insulation layer is less than 50% of the original thickness of the cable insulation layer, or the damaged position of the cable insulation layer is positioned at a laying stress concentration position comprising a Glan head locking position and a long-term bending position of the cable.
Repairing secondary defects, including:
in the middle area of the damaged position of the cable insulating layer, after the damaged position of the cable insulating layer is filled up by using a repair material 4, the damaged position of the cable insulating layer is directly blown by using a hot drying gun, and finally the damaged position of the cable insulating layer is wound and wrapped by using a protective material 5 in a semi-stacked manner.
Further, filling a middle area at the damaged position of the cable insulation layer, wherein the distance between the middle area and the two ends of the damaged position of the cable insulation layer is 8-12 mm; directly blowing with a 90-110 deg.C baking gun for 3-7 min; the protective material 5 is 3M anticorrosion adhesive tape;
in this embodiment, the distance between the middle area and the two ends of the damaged position of the cable insulation layer is 8mm, and a 100 ℃ hot drying gun is adopted for direct blowing for 5 min.
Further, the repair material 4 is a methyl vinyl silicone rubber material employing a diclorobenzoic acid peroxide curing system.
The cable conductor 1, the cable insulation layer 2, the methyl vinyl silicone rubber material, the 3M anti-corrosion adhesive tape and the heat drying gun are available in various types in the prior art, and those skilled in the art can select the appropriate type according to actual needs, and the embodiment is not illustrated. The properties are similar, including high breakdown strength, low dielectric loss, high insulation resistance, excellent discharge resistance and stable insulation properties.
The EN 50382 series high-temperature-resistant power cable is reduced in insulation thickness due to extrusion, cutting, flat pin, needle punching and the like, and when the residual insulation thickness is not less than 75% of the average thickness, the defect is rated as a secondary defect. The repair material 4 is an insulating material which is similar to a cable insulating material and has performance and accords with the environment of the cable. The repairing method is characterized in that a 10mm middle area at each of two ends of a defect is selected, a methyl vinyl silicone rubber material adopting a dichlorobenzoic peroxide vulcanization system is used for filling up the damaged cable surface in the rail transit vehicle body, an online crosslinking technology of directly blowing for 5min by a 100 ℃ hot drying gun is adopted, and finally a protective material-5M anticorrosive adhesive tape is used for semi-overlapping winding and wrapping.
The repaired samples were then tested according to EN 50382-2:2008 railway equipment-high temperature power cables for railway vehicles with special combustion properties-test method 7.3. The test method comprises the following steps: and (3) taking all the lengths of the sample wires, immersing the sample wires in water at the temperature of 20 +/-5 ℃, extending two ends of the sample wires out of the water surface for about 150mm, immersing the sample wires in water for 1h, and applying voltage for finished vehicle test between the water and the cable cores for 5 min. The voltage reference for the whole vehicle acceptance is EN 50343: 2003 European Standard Cable Wiring rules Table 7, the test voltage calculated by selecting the voltage 380V on the common vehicle is 2.5 kV. The test result shows that the insulation resistance of the repaired cable is greatly improved compared with that of the cable before repair, and the electrical performance meets the acceptance standard of the whole vehicle.
Example two
Different from the first embodiment, in the second embodiment, when the second-level defect is repaired, the middle area of the damaged position of the cable insulation layer is filled, and the distance between the middle area and the two ends of the damaged position of the cable insulation layer is 10 mm; directly blowing for 7min by using a 90 ℃ hot drying gun.
EXAMPLE III
Unlike the first embodiment, the repairing of the three-level defects in the present embodiment includes:
cutting the center of the damaged position of the cable insulating layer into a regular shape along the axial direction of the cable;
cutting a piece of repair material 4, and uniformly filling and compacting the repair material 4 at the damaged position of the cable insulation layer;
after the repairing material 4 is completely cured, cutting or polishing the repairing material 4 higher than the surface of the cable insulation layer to be flat;
a protective material 5 for sealing water and insulation protection is fixed on the repair material 4.
Further, cutting the center of the damaged position of the cable insulating layer into a circular shape, a triangular shape or a rectangular shape along the axial direction of the cable;
cutting into a circular shape, wherein the circular shape is 10mm in height and 5mm in diameter, and the length and width of the cut repair material 4 are 15mm multiplied by 10 mm; the halogen-free double-walled heat-shrinkable tube was 20mm long, and the halogen-free double-walled heat-shrinkable tube was completely shrunk using a heat gun at 125 ℃.
Further, the repair material 4 is a self-curing insulating waterproof protective packing material, and the protective material 5 is a halogen-free double-wall heat-shrinkable tube;
the repair material 4 is sleeved with a halogen-free double-wall heat-shrinkable tube which has excellent sealing, waterproof and anti-corrosion capabilities; and the halogen-free double-wall heat-shrinkable tube is completely shrunk at 125 ℃ by using a heat drying gun.
The halogen-free double-wall heat-shrinkable tube is composed of halogen-free flame-retardant polyolefin and hot melt adhesive, and has excellent sealing, waterproof and anticorrosion capabilities. Under the condition that the heat shrinkable tube cannot be sleeved, the protective material 5 can be used for winding and wrapping the electric insulating rubber adhesive tape in a half-overlapping mode, so that the cable has excellent electric and material properties.
The self-curing insulating waterproof protective packaging material and the halogen-free double-wall heat shrinkable tube can be made into various types in the prior art, and those skilled in the art can select a suitable type according to actual requirements, and the embodiments are not illustrated.
The repaired cable was tested according to EN 50305:2002 railway installation-cable for rail transit with special fire-proof properties-test method 6.2.1. The test method comprises the following steps: and (3) taking all the lengths of the repaired cable sample wires, immersing the repaired cable sample wires in water at the temperature of 20 +/-5 ℃, extending two ends of the repaired cable sample wires out of the water surface by about 150mm, immersing the repaired cable sample wires in water for 1h, and applying voltage during finished vehicle testing between the water and the cable cores for 5 min. The voltage reference for the whole vehicle acceptance is EN 50343: 2003 European Standard Cable Wiring rules Table 7, the test voltage calculated by selecting the voltage 380V on the common vehicle is 2.5 kV. The test result shows that the insulation resistance of the repaired cable is greatly improved compared with that of the cable before repair, and the electrical performance meets the acceptance standard of the whole vehicle.
Example four
Different from the third embodiment, in the present embodiment, repairing the three-level defect includes:
waiting for the repair material 4 to be completely cured at room temperature for 72 hours, and cutting or polishing the packing material higher than the surface of the cable by using an art designer knife and abrasive paper to be flat; the repairing material 4 is a self-curing insulating waterproof protective packing material, the protective material 5 is a 3M anti-corrosion adhesive tape, and the repairing material 4 is wound and wrapped by the protective material 5 in a semi-overlapping mode.
The EN 50264 series high-temperature resistant power cable is reduced in insulation thickness due to extrusion, cutting, flat pin, needle punching and the like, and when the residual insulation thickness is not less than 50% of the average thickness, the defect is rated as a three-level defect. The repair material 4 is a self-curing insulating waterproof protective packaging material, and the protective material 5 is a halogen-free double-wall heat-shrinkable tube or a 3M anti-corrosion adhesive tape. The repair method is to cut the damaged part into a regular shape of 10x5mm along the axial direction of the cable with the damaged center as the center by using an art designer to the defect part which is a cutting damage, a needle prick hole or an irregular pit. The packaging tape of the self-curing insulating waterproof protective packaging material is opened, gloves are put on, a piece of self-curing insulating waterproof protective packaging material of 15x10mm is cut by an art designer knife, and the packaging material is uniformly filled at the damaged position of the cable and compacted. And after the packaging material is completely cured at room temperature for 72 hours, cutting and polishing the packaging material higher than the surface of the cable by using an art designer knife and abrasive paper. And finally, sleeving a layer of 20 mm-long halogen-free double-wall heat-shrinkable tube at the repaired position to perform sealing, waterproof and insulation protection on the repaired position of the cable, and completely shrinking the heat-shrinkable tube at 125 ℃ by using a heat drying gun. The double-wall pipe is composed of halogen-free flame-retardant polyolefin and hot melt adhesive, and has excellent sealing, waterproof and anticorrosion capabilities. Under the condition that the heat shrinkable tube cannot be sleeved, the cable can be wound and wrapped in a half-overlapping mode of an electric insulating rubber adhesive tape by using a protective material-5, so that the cable has excellent electric and material properties.
The repaired samples were then tested according to EN 50264-2-1:2008 railroad equipment-power cables and control cables for railway vehicles with special fire performance-test method 7.3. The test method comprises the following steps: and (3) taking all the lengths of the sample wires, immersing the sample wires in water at the temperature of 20 +/-5 ℃, extending two ends of the sample wires out of the water surface for about 150mm, immersing the sample wires in water for 1h, and applying voltage for finished vehicle test between the water and the cable cores for 5 min. The voltage reference for the whole vehicle acceptance is EN 50343: 2003 European Standard Cable Wiring rules Table 7, the test voltage calculated by selecting the voltage 380V on the common vehicle is 2.5 kV. The test result shows that the insulation resistance of the repaired cable is greatly improved compared with that of the cable before repair, and the electrical performance meets the acceptance standard of the whole vehicle.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A cable repairing method for a rail transit vehicle is characterized by comprising the following steps:
and dividing the residual thickness of the cable insulating layer at the damaged position (3) of the cable insulating layer into a plurality of levels of defects, and repairing the defects of different levels by different repairing methods.
2. The method for repairing a cable for a rail transit vehicle according to claim 1,
and dividing the residual thickness of the cable insulating layer at the damaged position (3) of the cable insulating layer into a first-level defect, a second-level defect, a third-level defect and a fourth-level defect, repairing the first-level defect, the second-level defect and the third-level defect, and not repairing the fourth-level defect.
3. The method for repairing a cable for a rail transit vehicle according to claim 1,
first-order defects: the outer surface of the cable has mechanical indentation or discoloration, and the surface of the cable insulating layer is not damaged;
secondary defects: the thickness of the cable insulation layer is reduced due to pits caused by extrusion, cutting, flat pin or needle pricking of the cable, and the residual thickness of the cable insulation layer at the damaged position (3) of the cable insulation layer is not less than 75% of the original thickness of the cable insulation layer;
three-level defects: the thickness of a cable insulating layer is reduced due to pits caused by extrusion, cutting, flat pin or needle pricking of the cable, the residual thickness of the cable insulating layer at the damaged position (3) of the cable insulating layer is not less than 50% of the original thickness of the cable insulating layer, and the residual thickness of the cable insulating layer at the damaged position (3) of the cable insulating layer is less than 75% of the original thickness of the cable insulating layer;
fourth-order defects: the thickness of a cable insulating layer is reduced due to pits caused by extrusion, cutting, flat pin or needle punching of the cable, the residual thickness of the cable insulating layer at the damaged position (3) of the cable insulating layer is smaller than 50% of the original thickness of the cable insulating layer, or the damaged position (3) of the cable insulating layer is positioned at a stress concentration position during laying, wherein the stress concentration position comprises a Glan head locking position and a long-term bending position of the cable.
4. The method for repairing a cable for a rail transit vehicle according to claim 2,
repairing secondary defects, including:
in the middle area of the damaged position (3) of the cable insulating layer, after the damaged position (3) of the cable insulating layer is filled up by using a repairing material (4), the damaged position (3) of the cable insulating layer is directly blown by using a hot drying gun, and finally the damaged position (3) of the cable insulating layer is wrapped by using a protective material (5) in a semi-stacked winding manner.
5. The method for repairing a cable for a rail transit vehicle according to claim 4,
filling the middle area of the damaged position (3) of the cable insulating layer, wherein the distance between the middle area and the two ends of the damaged position (3) of the cable insulating layer is 8-12 mm; directly blowing with a 90-110 deg.C baking gun for 3-7 min; the protective material (5) is 3M anticorrosion adhesive tape.
6. The method for repairing a cable for a rail transit vehicle according to claim 4,
the repair material (4) is a methyl vinyl silicone rubber material adopting a peroxydichlorobenzoic acid vulcanization system.
7. The method for repairing a cable for a rail transit vehicle according to claim 2,
repairing the tertiary defect, including:
cutting the center of the damaged position (3) of the cable insulating layer into a regular shape along the axial direction of the cable;
cutting a piece of repair material (4), and uniformly filling and compacting the repair material (4) at the damaged position (3) of the cable insulation layer;
after the repairing material (4) is completely cured, cutting or polishing the repairing material (4) higher than the surface of the cable insulating layer to be flat;
and a protective material (5) for sealing, water proofing and insulating protection is fixed on the repair material (4).
8. The method for repairing a cable for a rail transit vehicle according to claim 7,
the repairing material (4) is a self-curing insulating waterproof protective packing material, and the protective material (5) is a halogen-free double-wall heat-shrinkable tube;
and a halogen-free double-wall heat-shrinkable tube is sleeved on the repair material (4), and the halogen-free double-wall heat-shrinkable tube is heated to be completely shrunk by using a heat drying gun.
9. The method for repairing a cable for a rail transit vehicle according to claim 8,
cutting the center of the damaged position (3) of the cable insulating layer into a circular shape, a triangular shape or a rectangular shape along the axial direction of the cable;
cutting into a circular shape, wherein the circular shape is 10mm in height and 5mm in diameter, and the length and width of the cut repair material (4) are 15mm multiplied by 10 mm; the halogen-free double-walled heat-shrinkable tube was 20mm long, and the halogen-free double-walled heat-shrinkable tube was completely shrunk using a heat gun at 125 ℃.
10. The method for repairing a cable for a rail transit vehicle according to claim 7,
waiting for the repair material (4) to be completely cured at room temperature for 72 hours, and cutting or polishing the packing material higher than the surface of the cable by using an art designer knife and abrasive paper to be flat; the repair material (4) is a self-curing insulating waterproof protective packing material, the protective material (5) is a 3M anticorrosion adhesive tape,
the protective material (5) is wound and wrapped at the position of the repair material (4) in a semi-overlapping mode.
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| EP4387021A1 (en) * | 2022-12-14 | 2024-06-19 | Nexans | Method for repairing a cable outer semiconducting layer |
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Application publication date: 20211008 |