Import and export of ball mill shaft head wear online repair

Import and export of ball mill shaft head wear repair 2019 - online 05 - 23' Abstract 】 F the blue repair technology is the use of polymer metal repair materials import and export of ball mill solving shaft head wear repair on site, its biggest advantage is that can realize the scene to repair, repair of high efficiency, less input resources, its service life even more than traditional way to repair. 【 Keywords 】 Ball mill, ball mill bearing wear repair, shaft head repair, online repair 1, equipment, ball mill is the material being broken, and then to smash the key equipment. This type of grinding machine is in the cylinder body into a certain number of steel ball as grinding media. Material composed of feeding device through the hollow shaft spiral evenly into the mill first warehouse, the warehouse has ladder plate or corrugated plate, built in all kinds of steel ball, cylinder rotate falling after the ball to a certain height, the centrifugal force is generated on the material and grinding effect. Material in the first warehouse after reaching coarse grinding, by monolayer partition storehouse board into the second warehouse, the warehouse with a flat plate, inside the steel ball, will further grinding material. Powder through the unloading Bi board, finish grinding homework. 2, equipment problem and reason analysis of a certain power plant coal ball mill imported bearing bit wear, 750 mm in diameter, 1 - uneven wear 2 mm, width 200 mm wear and tear, bearing type 239/750 ca/W33, turn speed per minute 17, was forced to stop. Rule out the reason of designing and manufacturing the device itself, in the process of long-term operation, due to the bearing life cycle is too long, the bearing itself appear wear away, clearance is too large, medium oil film lubrication process to ensure the bearing lubrication, at the same time, seal damage internal material dust into the bearing, bearing rolling friction increases, the normal operation of the serious influence bearing, lead to bearing operating temperature is too high, cause bearing sintering lock, thereby further lead to bearing inner ring and relative rotation axis. Since the stiffness of the bearing steel is greater than the shaft itself material hardness, the wear of the shaft. Other equipment during operation for a long time, because of metal fatigue, plastic deformation in the shaft itself, shaft and bearing inner ring gap, leading to bearing inner ring and shaft relative rotation axis caused by wear and tear. 3, equipment repair mode ( 1) Traditional maintenance mode thermal spraying process need to remove the whole device, need to invest a lot of manpower and resources. Thermal spraying technology need to be machined in the process of repair, due to large equipment, also to the requirement of lathe is very high. Thermal spray repair process repair precision is high, but for large equipment repair is difficult, and could not be repaired on site, lead to the repair period is longer, repair the high cost, companies often can't accept it. The traditional repair welding machine repair technology facing the same problem on site was unable to complete repair, repair cycle is long, the comprehensive cost is high, long downtime shutdown will cause huge economic losses to the enterprise. Whether thermal spraying or repair welding machining process, the repair process of thermal stress concentration problems, lead to shaft deformation or broken shaft of hidden dangers. （ 2) Advantages and feasibility analysis of the repair is at the site in recent years the rise of a maintenance mode, its principle is on the premise of not machining, using polymer composite repair technology in the field repair, repair after curing with polymer composite material formed by the chemical bond connection force and repair metal parts forming excellent adhesion, meet the requirement of equipment in operation under various complex force, this kind of restorative materials with the blue 2211 f performance is more reliable. 4, 1) polymer field repair construction technology Use of bearing not wear on both ends for positioning datum processing model feet; 2) Surface oil, and the wear surface polishing rough, wash clean with anhydrous ethanol; 3) Harmonic daub f the blue 2211 f polymer composite materials, blow grind material in order to repair parts with boilerplate ruler; 4) Material temperature curing 8 - Curing 4 to 12 hours, or heat 6 hours. 5) Template rule is used to inspect whether there is high after repair parts, and repair to the requirements of the installation size; 6) Bearing heating installation. Summary of 5, 6 application illustration, ball mill is an important equipment in cement, thermal power industry such as production, ensure the safe operation of the ball mill, is the enterprise product quality and yield. Using the blue polymer composite materials to repair, has the characteristic of the adhesive properties, pressure resistance and good 'concession line, etc. , in the repair of such problem reflects the characteristics of fast, convenient, durable, save a lot of precious time for the enterprise. F the blue the reasonable application of technology and materials, in the enterprise modernization has significant value in the production process. At the same time of help enterprises to improve equipment management means, to minimize downtime, drop caused economic losses.