Introduction of Rotary Kiln Structure

Kiln Cylinder

It is the main body of the rotary kiln. The thickness of the kiln shell steel plate is about 40mm. Near the tire ring, because the bearing capacity is relatively large, the kiln shell steel plate here is thicker. The interior of the kiln shell is covered with a layer of refractory bricks of about 200 mm. When the kiln shell is in operation, due to the relationship between high temperature and load bearing, the kiln shell will have an elliptical deformation, which will exert pressure on the kiln brick and affect the life of the kiln brick. At the end of the kiln, about one meter long is tapered, so that the material from the preheater feed chamber can enter the kiln more smoothly.

Fetal Ring Gear

Support rollers, bearings, rings and support rollers are used to support the weight of the rotary kiln. The tire ring is sleeved on the kiln shell, and it is not fixed between the rotary kiln and the kiln shell. The kiln shell and the tire ring are separated by an iron plate to keep a certain gap between the tire ring and the kiln shell.  If the gap is too small, the expansion of the kiln shell is limited by the tire ring, and the kiln brick is easily damaged. If the gap is too large, the relative movement between the kiln shell and the tire ring, the friction is more harmful, and the elliptical deformation of the kiln shell is more serious. It is usually necessary to add lubricant between the two. Our door can estimate the degree of elliptical deformation of the kiln shell by the relative movement between the kiln shell and the tire ring.

There is a difference in thermal conductivity between kiln shell and the tire ring. It is necessary to use an external windmill to help the kiln shell to dissipate heat, and to balance and reduce the temperature difference between the two. Otherwise the expansion of the kiln shell will be limited by tire ring. When the kiln is opened, the heating rate of kiln shell is higher than that of the tire ring. The kiln must control the heating rate of the rotary kiln (rotary kiln) at 50 °C/h, which is beneficial to protect the kiln brick. Usually, the roller has a bandwidth of 50-100 mm or more than the wheel. The roller bearing is made of babbitt. If the bearing loses lubrication, the bearing will burn out due to excessive temperature. There is cooling water at the bearing for circulating cooling. In order to reduce the heat radiation of the kiln shell to the tire ring, the temperature of the roller is too high, and a heat insulation plate is added between the two to reduce heat radiation. Rotary kiln (rotary kiln) generally has 2 to 3 sets of rollers.

Roller-Support Wheel Set

The thrust roller is the limit switch that limits the time when the rotary kiln (rotary kiln) feed. Because the support roller is wider than the kiln tire, in order to make the roller and the belt move up and down, the wear is even. A thrust roller is provided on the end surface of the tire ring.

The thrust roller only acts as a barrier, and the roller itself has no power. The eating and eating of the kiln body depends on the deviation of the roller. The supporting wheel and the center line of the kiln have a certain angle, so that the supporting wheel gives the kiln body an upward force and moves the kiln shell upward. Sometimes the raw material powder is sprinkled or the roller is wiped clean, and the friction coefficient is increased to move the kiln up. When the kiln body is eaten, as long as the graphite powder is sprinkled between the supporting wheel and the wheel belt, the friction between the two can be reduced. When the rotary kiln (rotary kiln) eats and touches the Y1 switch, the hydraulic system starts to take action, the hydraulic system eats for 1 minute, stops for 4 minutes, and then repeats the action of stopping for 1 minute for 4 minutes until the kiln tire ring touches. Go to the Y5 position. At this point, the kiln began to eat, the hydraulic system was released for 2 minutes, stopped for 4 minutes, and then repeated. Until the kiln touches the Y1 position and eats again. Repeat the above process continuously. When the hydraulic system stops, the internal pressure does not change.

Hydraulic System

The hydraulic system also has three to limit switches. When working, if the Y1 switch is faulty, the kiln body will touch the Y second switch, the system will alarm (the kiln body has exceeded the eating range of 30mm), and if it touches the third switch, the system will Jumping (at this time, it is 50mm beyond the eating range). When the rotary kiln (rotary kiln) is eaten, if the first switch is faulty, the rotary kiln (rotary kiln) will alarm when it touches the second switch, but there will be no accident because there is a thrust roller. Limit the operating limit of the kiln shell