Analysis of the Causes of the Broken tyre of Rotary Kiln
Rotary kiln refers to rotary calcining kiln (commonly known as rotary kiln), which belongs to building materials equipment. Rotary kiln can be divided into cement kiln, metallurgical chemical kiln and lime kiln according to different processing materials. In many production industries such as building materials, metallurgy, chemical industry, environmental protection, etc., rotary materials are widely used for mechanical, physical or chemical treatment of solid materials. Such equipment is called rotary kiln.
Analysis of the cause of the fracture of the rotary kiln wheel: The fracture of the cement rotary kiln is a major equipment accident of the cement plant. Due to the large size of the rotary kiln wheel tyre, it is not only difficult to manufacture, but also expensive to transport and install. For this reason, it is of great practical significance to repair the cracks of the wheel tyre and prolong its service life. The fracture of the rotary kiln tyre can be divided into two situations:
1) The surface of the tyre has a network crack and a large peeling defect, which causes the tire tyre to be exposed to fatigue during the early period.
We know that during the operation of the rotary kiln, the surface of the tyre is actually subjected to a dynamic load of one cycle change. In the position of 3-4 mm and 5-7 mm in the skin layer of the tyre, there are alternating loads and pulsating loads respectively. The microcracks generated underneath are parallel or at an angle of 45 degrees with the contact stress. With the crack propagation and other external bending moments, the crack develops further toward the epidermis and depth, and even penetrates and is brittle, causing surface peeling damage.
The main reason for the early contact fatigue cracking of the skin of the rotary kiln wheel is that after the wheel is put into operation, the surface wear of the high-hardness segregation zone is smaller than that of the normal zone, causing the surface of the zone to bulge, resulting in stress concentration. Under the action, there are non-metallic debris in the surface of the tyre and defects such as cast sand holes. Micro-cracks are formed first. The external conditions such as infiltration of corrosive medium (cooling water), kiln turbulence, wheel temperature difference, etc. will accelerate the tyre. Cracking.
2) The tyre has a low temperature brittle fracture. Generally, the material of the wheel tyre is below 0 degrees, the impact value is very low, and there is almost no plastic deformation ability. Therefore, at low temperatures, less stress is sufficient to cause brittle fracture of the tyre.
The wheel tyre belongs to a large steel casting, and inevitably there are casting defects such as sand holes, slag inclusions, and inclusions. According to the survey, most of the origin of the crack inside the wheel has sand holes and slag. Under normal circumstances, the kiln is overhauled, the temperature of the kiln is reduced from 150-300 °C to atmospheric temperature, and the whole kiln body will be shortened, resulting in uneven internal stress of the wheel tyre, and the action points of the tyre and the tug change. The sudden start of the cold kiln causes brittle fracture of the tyre that is in a low temperature brittle state. The low temperature brittle fracture of the wheel occurs mostly in winter and spring.
The rotary kiln tyre is also called the rolling ring. Its function is to transfer all the gravity of the simplified body (including the gravity of the refractory brick, internal equipment and materials) to the supporting wheel, and enable the simplified body to smoothly rotate on the supporting wheel, so the tyre Be able to have sufficient strength and durability. At the same time, the wheel is a part that strengthens the simplified radial stiffness and should have sufficient rigidity.
I plant production equipment, strong technical force, advanced detection methods, the production of various specifications of various materials rotary kiln tyres, large and small gears and other accessories, single-piece casting capacity of less than 30 tons, the annual production and use of rotary kiln The manufacturer provides one thousand sets of accessories such as wheels, gears, bearing blocks and spherical tiles. The integrity, strength and product quality of our company have been recognized and praised by the industry. Welcome friends from all walks of life to visit our factory, guide and negotiate business.
Do you have any specific questions about the design or manufacture of Rotary kiln or Kiln spare? Contact Yogie! Our sales engineers will work with you from start to finish to ensure that your project is completed to your requirements.
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