In an online sealing of mill discharge type drying method

Discharge type dry mill in 2020 - an online sealing method 05 - 13 Fang Xingfa ( Tianchen cement day industry limited liability company in xinjiang, xinjiang shihezi 832000). A company original seal for grinding machine is set on the bearing cover face arc plate bolt, using arc plate pressure felt seal, surface contact implementation by felt strip seal on the shaft seal. But in recent years the bar seal or felt seal installation after the completion of the operation for days appeared leaks, replace the seal after felt did not thoroughly improved. One, the original seal design original contact seal leakage reason analysis generally on high dimension accuracy requirement in the equipment, and ensure that equipment running stable state for a long time. Basic every time the company seal felt a replacement by artificial cut, felt quality is uneven. Together with equipment use fixed number of year is over 10 years, as felt on the bearing cover, due to the entire bearing cover and the shaft concentricity have larger deviation, felt and seal face some point contact is tight, some point contact is loose, use a few days later there is leakage, frequent downtime, affected the normal production. Original form of sealing and leakage as shown in figure 1. Figure 1 original seal structure and the leakage situation due to the equipment repair cost on the high side of ontology, only in the seal material and seal the form to make changes, to the company by comparing products, determine the following scheme. Second, the retrofit scheme 2. 1 seal selection according to the company mill operating conditions, environmental conditions and sealing requirements, selecting reflow labyrinth seal, the sealing structure as shown in figure 2. Figure 2 reflux labyrinth seal structure 2. 2 seal material selection in combination with regional temperature and the site environment, decided to adopt the oil resistance, abrasion resistance, heat resistance, - 35℃～100℃) Nitrile rubber, such as hardness and heat resistance condition guarantee under the premise of preventing because of bearing cover and shaft concentricity deviation problem caused by oil after seal wear. 2. 3 sealing principle and advantages of sealing structure made up by two parts of the dynamic and static, static ring by connecting plate connected to the bearing cover fixed remain still, ring fixed on the cylinder bracket and rotate with the mill. When mill barrel rotates, across the wiper rod part of the lubricating oil inside the ring tooth block, under the action of gravity along the inner gear ring seal groove of the lateral flow within the oil baffle plate and alveolar cavity remit by bearing box the rare gas station, ensure lubricating oil is not leaked. Third, the conclusion form the sealing structure has been in the company system machine large equipment installation, use effect is very ideal, have affairs plans to modify grinding confidential letters. Source: 'cement' 5, 2019