The failure of double-rod hydraulic cylinder is often caused by seal wear, cylinder wear, inner wall abrasion, inner wall corrosion, piston or piston rod abrasion and so on. The sealing performance of pressure coating cylinder of hydraulic equipment directly affects the performance of equipment, especially for larger hydraulic cylinders, it is difficult to repair or replace parts after the sealing performance is damaged, and the cost is high.

The traditional repair method is to disassemble the damaged part for external repair, or brush and scrape the surface as a whole, but the repair cycle is long and the repair cost is high.

The repair process is as follows:

1. surface treatment: first, clean and polish. Soak the absorbent cotton in acetone or anhydrous ethanol, clean the scratched part and polish it. (If it is directly polished without cleaning first, oil stains will penetrate into the cylinder body, resulting in weak adhesion or even falling off. When grinding, first grind the part above the datum plane of the extrusion part to below the datum plane to prevent the plunger from being scratched again, then use a matching file to remove the oil stain and foreign matter in the scratch groove, and finally use a rotary file to roughen the whole scratch surface. ) clean, heat and dry, and wipe the polished scraped surface with acetone. Then dry the water with a hot air blower or iodine tungsten lamp, and preheat the surface to be repaired, especially when the room temperature is lower than 15℃.

2. Ingredients: mix in strict proportion and stir evenly until there is no color difference.

3, daubing material: daubing on the scratched surface; The first layer should be thin, even and completely cover the scratched surface, so as to ensure the best adhesion between the material and the metal surface. Then, apply the material to the whole repair part and press it repeatedly to ensure that the material is filled to the required thickness, so that it is slightly higher than the inner wall surface of the cylinder.

4. Curing: It takes 24 hours for the material to fully achieve various properties at 24℃. In order to save time, tungsten halogen lamp can be used to increase the temperature. When the temperature increases 1 1℃, the curing time will be shortened by half, and the optimum curing temperature is 70℃.

5. After the material is solidified, the material above the surface is repaired and leveled with a fine grindstone or scraper, and the construction is completed.