When the main parts of rotary kiln are worn to the following extent or have the following defects, they need to be replaced or repaired: when the tooth thickness of transmission gear is worn by 30% or 0.5 modulus, or the rim is irreparably damaged; When there are cracks or local deformation in the kiln cylinder, repair or replace it; It is found that the tire section is worn 10% (stress and stiffness should be checked at this time), or the surface is polished into a cone or polygon, and local through cracks need to be replaced;
When the thickness of the idler pulley is worn 10%, the thickness of the pulley flange is worn by 20%, or the surface of the idler pulley is ground into a cone, polygon or other special shape, or there is a through crack between the idler pulley and the pulley flange, it must be replaced or repaired. When replacing the idler and shaft, the corresponding lining tile must be re-studied; When the thickness of fixed friction ring and movable friction ring of kiln tail sealing device is worn to two thirds, they must be replaced. Crack of roller bearing ball: The roller bearing ball of rotary kiln is accidentally frozen and cracked, which is made of cast iron and cannot be repaired by traditional methods. Scrap replacement is not only costly, but also spare parts need to be shut down for a long time, which will cause great losses to enterprises. Repair of damaged idler bearing: During the operation of rotary kiln, idler bearing was damaged due to accident. After the problem occurs, the traditional method can not be effectively repaired. Replacing new spare parts is not only costly, but also requires long-term downtime to wait for spare parts, which causes great losses to enterprises.
Wear of ball of roller bearing
During the operation of rotary kiln, the ball of bearing seat is worn due to the fracture of bearing bush. After the problem occurs, the traditional method cannot be effectively repaired on site. Replacing new spare parts is not only costly, but also requires long-term downtime to wait for spare parts, which causes great losses to enterprises.
Meijiahua technology products in the United States have excellent adhesion, excellent compressive strength and other comprehensive properties. Meijiahua polymer composite materials can quickly repair the wear of tile seat spheres without processing site. That is, there is no influence of welding thermal stress, and the repair thickness is not limited. At the same time, the product has flexibility that metal materials do not have, absorbs the impact and vibration of equipment, and can make the mating surface 100% contact, thus avoiding the possibility of re-wear.
There are cracks on the ball of roller cushion seat.
Because of accidental freezing crack and cast iron material, the steel ball of the bearing wheel tile seat of rotary kiln can not be repaired by traditional methods. Scrap replacement is not only costly, but also spare parts need to be shut down for a long time, which will cause great losses to enterprises. American Meijiahua science and technology products have super adhesion, excellent comprehensive mechanical properties, good water resistance, oil resistance and chemical medium resistance. Using Meijiahua polymer composite material to repair the bearing balls of rotary kiln idler can save a lot of downtime for enterprises and create great economic value. Avoid scrapping and replacement, and optimize the internal maintenance resources of enterprises.
Lime rotary kiln equipment
Technical features of lime rotary kiln: The vertical preheater with advanced structure and small pressure loss in lime rotary kiln can effectively improve the preheating effect. The decomposition rate of preheated limestone can reach 20-25%, and the fine limestone of 10- 15mm can be directly used. Reliable combined seal at both ends of lime rotary kiln middle rotary kiln. Make the air leakage coefficient less than 10%, and use composite refractory to reduce radiation heat loss; Lime rotary kiln adopts a circular or square vertical cooler with zonal ventilation, so that the lime temperature of the outlet cooler can reach 800C+ ambient temperature, which is convenient for transportation and storage, and the secondary air entering the kiln can be preheated above 7000C, thus reducing moving parts and special materials.
The design of lime rotary kiln shall meet the following requirements.
1, the specifications of lime rotary kiln should be comprehensively determined according to the output requirements of sintering system, combined with the situation of raw materials and fuel, and the configuration of preheater, calciner and cooler.
2. The length-diameter ratio of preheater kiln and precalciner kiln should be 1 1- 16.
3. The slopes of preheater kiln and calciner kiln should be 3.5%-4%; Maximum rotating speed: 3.0-3.5r/min for precalciner kiln and 2.0-2.5r/min for preheating kiln; Speed range 1: 10.
4. Forced air cooling should be adopted for the cooling of lime rotary kiln sintering belt cylinder.
5, lime rotary kiln firing zone should have cylinder temperature detection measures.
6, lime rotary kiln's main motor should adopt stepless speed change motor, and need to set up auxiliary drive, auxiliary drive should have standby power supply.
shopping tips
1, don't identify a manufacturer of mechanical equipment, but identify 2-5 manufacturers that you think are more powerful. (Recommended machinery and equipment manufacturer Henan Xingyang Mining Machinery Factory) After these 2-5 manufacturers are confirmed, please open the main websites of these manufacturers to see if the website layout is clear. Imagine how a powerful enterprise can not pay attention to brand promotion in 2 1 century.
2. Through the first link, two manufacturers with poor strength can be eliminated. Then look at the websites of the other three manufacturers. At this time, it depends on the production capacity, delivery location, customer location, after-sales service and so on. Mechanical equipment manufacturers, to ensure that the vertical preheater manufacturers have the production strength.
The above two steps are only to save unnecessary time and cost.
4. The final manufacturer requires to provide a customer site that is relatively close to its location.