Repairing process and repairing tool for excircle crack conquassation of tires and carrier rollers of rotary kiln

Abstract

The invention relates to a repairing process and a repairing tool for excircle crack conquassation of tires and carrier rollers of a rotary kiln. According to the invention, a flux-cored wire, of which the tensile strength is 585, is used for padding and isolating; padding, isolating and cladding are conducted twice on a circle of a plano-concave groove, wherein the current is 190, the voltage is 22, and the welding seam is required to be 10 mm higher than the upper part of a groove base metal; then a solid core wire, of which the yield strength is 580, is used for replacing the flux-cored wire to caulk and restore the size, wherein the integral appearance of a concave welding bead is required to be kept during the build-up welding process; segmental welding is adopted on the basis to restore the size; finally, a temper bead is additionally capped; when the size is restored through build-up welding, the internal stress can be lowered to the minimum value, and build-up welding is fulfilled; and on-site heat treatment is carried out immediately. Therefore, the repairing process and the repairing tool have the advantages that the integration of welding material and base metal can be better; the distribution of metallographic structures and hardness is uniform; impact of vertical welding is avoided; the construction is fast; the welding strength is high; the ductility and the toughness are good; wear-resistant, corrosion-resistant, heat-proof, shock-proof and crack-resistant capabilities are excellent; stop time in cement enterprises is reduced; and the production efficiency is improved.

Description

technical field [0001] The invention relates to a repairing process and a tool thereof, in particular to a repairing process and a tool thereof for cracks and crushing of the outer circle of a rotary kiln tire and a supporting roller. Background technique [0002] In the past ten years, with the country's energy saving and emission reduction, and industrial upgrading, there are currently more than a thousand companies using the new dry rotary kiln process for cement production. Because the large steel casting rolling ring supporting wheels of the rotary kiln are the cement plant's The key equipment, it supports the cylinder body and the weight of kiln bricks and cement clinker in the cylinder body, and rotates under the power traction. The contact stress between the rolling ring and the supporting wheel reaches 1700 kg per square centimeter. If the rolling ring and the outer circle of the supporting wheel The contact stress increases exponentially as the contact surface beco...

AI Technical Summary

Problems solved by technology

Due to the large volume of the rolling ring, the maximum diameter is 5 meters, the width is 1 meter, and the thickness is 50 cm. During casting, there are inevitably interlayers or shallow interlayers, loose structures, trachomas, hidden cracks over time, and harsh operating environments and high temperatures during use. , rapid cooling, heavy load, and long-term rotation produce periodic alternating compressive stress, resulting in local cracks and crushing of the outer circular working surface of the rolling ring or supporting wheel, resulting in vibration of the kiln and a huge hidden danger to safety production

However, it takes a long time to replace the rolling ring, and the cost is high, and the loss of production shutdown is huge. The replacement of the tire belt needs to stop production for 30 days, and the daily loss of 5,000 tons of kiln shutdown is 1.5 million.

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