Rotary Kiln Structure Overview: The rotary kiln is mainly composed of parts such as the kiln cylinder, transmission unit, support unit, braking wheel unit, kiln head sealing unit, kiln tail sealing unit, and kiln head hood.
Large-toothed ring assembly: A large-toothed ring is fixed on the kiln cylinder to transmit torque. The large-toothed ring is connected to the kiln cylinder through a tangential spring plate, which allows for sufficient space for heat dissipation between the large-toothed ring and the kiln cylinder. This connection structure also reduces the impact of bending and deformation on the kiln cylinder on meshing accuracy and serves as a shock absorption and cushioning function, benefiting the longevity of the kiln lining. Transmission device type: The transmission system uses single or double transmission, driven by one or two main drive motors. The main drive system consists of a main motor, main reducer, and small gear, along with auxiliary transmission equipment. The power supply for the auxiliary transmission equipment is from a safety power source or an on-board generator, facilitating installation, maintenance, drying of refractory materials, and kiln operation in the event of a main power failure, as well as preventing the kiln cylinder from bending and deforming during the cooling process. Braking devices are equipped on the auxiliary motor to prevent reverse rotation of the kiln when the motor stops due to the uneven weight of materials and kiln slag.
The large gear ring drive unit of the rotary kiln is an essential component of the kiln equipment. Proper alignment and smooth operation of the large and small gears are crucial for the normal production of the entire kiln. The large gears of the rotary kiln are made of cast steel or alloy steel, precision machined, featuring high precision, good quality, wear resistance, and strong load-bearing capacity. Even with the best gear quality and hardness, there will be some degree of wear during use. So, how can we reduce the wear on the large gear ring? Let's take a simple look together.
Key factors include ensuring the material requirements for large sprockets, requiring tempering of the blanks, normalizing to adjust the microstructure of the gears for increased hardness, and improving product processing technology and accuracy. This will reduce defects such as eccentricity, pitch errors, and tooth shape errors to a minimum, ensuring superior performance of the sprocket, reducing wear, and extending its service life.
To ensure proper installation, first, maintain concentricity between the large gear and the rotary kiln drum during assembly. Also, ensure parallelism and concentricity between the small gear and large gear axes, and minimize the gap in side and top clearances across the full tooth width. Reducing the overlap as much as possible is crucial for the normal operation of the equipment and to avoid excessive wear.
The mutual rotation of gears also causes friction, ensuring correct usage will reduce the frequency of friction, thereby minimizing wear.
In terms of lubrication, we use a manual method for regular oiling to ensure the correct brand and quality of the lubricant, and to ensure thorough and even oiling. The large gear ring of the rotary kiln is sealed with a gear cover to minimize the impact of dust and fine material particles on the wear of the gear ring, increasing the oil film area and reducing friction. Therefore, extra attention must be paid to lubrication. Wear is inevitable, but the best choice is to maintain high product quality and proper usage. If wear on the large gear ring is present, it can be resurfaced. If both surfaces are severely worn, it's crucial to prepare in advance to avoid affecting production.
