Repairing the hollow shaft of cement mill with cer

2022-08-22
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TS216 adds ceramic chips to repair a hollow shaft of cement mill

φ 2.4m × For a 13m cement mill, 16 high manganese steel wear-resistant lining plates are uniformly installed on the whole circumference of the grinding head. Due to the large gap (20 ~ 30mm) with the tail of the inner spiral cylinder installed in the feeding hollow shaft, it is difficult to eliminate. In order to strengthen the installation stability of waste materials between the hollow shaft, lining plate and inner spiral cylinder, a certain amount of cement mortar is poured into the gap to prevent the scouring of cement clinker. When the mill is running, the mixture (clinker, gypsum, coal gangue, etc.) passing through the gap washes the concrete in the gap and the newly installed lining plate. Generally, after about 3 months, the mixture washes directly to the hollow shaft. In order to reduce the erosion of the hollow shaft, it is customary to increase the number of concrete pouring. Whenever the grinding is stopped, the erosion of the concrete should be checked and supplemented in time. Heavy workload, once the mixture is neglected, it will directly erode the hollow shaft. From the 7 years after the production, the concrete has been poured 33 times in total, but the circular arc part of the hollow shaft is still abraded by 37mm, and the minimum abrasion amount at the requirement specification that can also determine the product description and function is also 14mm

therefore, in order to reduce and eliminate the abrasion at the circular arc of the hollow shaft, it is decided to use TS216 wear-resistant repair agent plus ceramic patch for repair. The specific method is: Polish and clean the eroded parts with a portable grinder to remove rust, ash, dirt, etc. Then clean with 755 high-efficiency detergent. Select TS216 wear-resistant repair agent and 111 cast iron repair agent, and mix them according to the proportion of the manual

apply TS216 to the abraded part. After a thin layer is applied at the bottom, stick a layer of ceramic sheet (specification 25mm × 25mm × 5mm), after the ceramic sheet is pasted for a week, apply another layer of TS216, and paste the ceramic sheet when the thickness is more than 6mm. In this way, the coating is adhered to the size before abrasion (75mm). Three 1kW iodine tungsten lamps are used on the whole circumference, which are about 400mm away from the repair surface and evenly irradiated for 24h. After curing, the hollow shaft can be used

it will be used for 3 years after repair, and the concrete will be poured for 3 times in total. The ceramic sheets pasted will be disassembled and inspected, and none of them will fall off. The abrasion amount measured by the test parameters of the spring testing machine is only 5.55 ~ 7.14mm. When the hammer contacts the impact specimen, it is expected to be available for 5 years. The cost of materials used is 15000 yuan, plus a repair cost of 3000 yuan, a total of 18000 yuan

from equipment management and maintenance magazine, issue 8, 2005 (end)

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