Maintenance tarpaulin technical requirements1

The basic requirements of Zhongshan tarpaulin are not allowed to have leaks and leaks. Needle seams are not allowed to replace welding or glue repairs. The shape of the patch is usually round or square, with arcs at the corners of the square. In case of extra-large cracks or holes, it can be cut according to the shape of the cracks or holes. The distance between the periphery of the patch cloth and the periphery of the breach or hole is greater than 40mm. Welding repair or glue repair The patch and the tarpaulin should be bonded smoothly, closely and firmly, without de-soldering, cracking and warping, no agglomeration, and the shaved part of the patch should not be exposed. The cracks should be butted by hand, and should be leveled and aligned after the butt joints. The stitch spacing is 14-18 needles/100mm. The width of the patch cloth after manual butt joints should be 100mm to 120mm. The holes should not be rigidly butted. Not less than 25N/30mm. The water hoisting test at the repair place is not allowed to seepage, smear or leak. 6.3 Sewing machine patching Double-thread patching should be used. There should be a distance of 15mm-20mm between the outer stitches of the pvc tarpaulin and the periphery of the patch cloth, and the distance between the two stitches should be 10mm. The suture should be uniform and straight, the needle size should be 14-18 stitches/100mm, and the back stitches should be no less than 3 stitches at the starting and ending points. The maintenance of the rope pressing cloth shall be made by two straight double-thread machines on both sides. The distance between the two sutures close to the pressing rope shall not be less than 45mm. The return needle at the needle stop should not be less than 50 mm. After repairing, the middle of the rope cloth should be properly arched to facilitate the passage of the waist rope. The machine repair needle eye should be coated with waterproof glue on both sides. Water seepage, smearing, and water leakage are not allowed in the water hoisting test at the repaired place. Tarpaulin rope The rope on the repaired cloth should not have broken strands, serious wear and insufficient length. The rope end should be tightly wound with ramie thread or polyester thread for five times, then sewed for four stitches, and the end of the rope end should be thermally bonded or glued to ensure that it is not loose. When inserting end ropes, corner ropes and edge-covered ropes, there should be no less than 8 buckles at all insertion points, and it is important to twist them together. The plastic tarpaulin is made of stainless steel, and the appearance should be flat and smooth. The eye rim should be firmly attached to the tarpaulin against the hemming rope. If the position of the eye socket cannot be replaced by the large triangle cloth, the small triangle cloth or the reinforcing rib, an additional pad should be added. Tarpaulin marking painting The marking on the repaired cloth should be clear. The size of the painting mark should meet the requirements of 'Technical Conditions for D-type tarpaulin for trucksMaintenance procedures The maintenance procedures include tarpaulin handover registration, cleaning, repair marking, repairing, folding and packing, etc. The specific steps are as follows: The railway tarpaulin maintenance unit checks the tarpaulin to be repaired according to the 'Wagon tarpaulin handover listAnd the registration work of the number of sheets. Spread the tarpaulin flat on the cleaned ground, and clean the dust on the cloth surface. The maintenance worker conducts a light transmission inspection, determines the maintenance scope, marks the maintenance location, and makes a record on the maintenance order, and the quality inspector conducts a review. After the maintenance worker carries out the maintenance according to the marked mark and the maintenance process requirements, the quality inspector conducts quality inspection and workload review.

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