Design scheme of grinding disc upgrade for vertical roller mill
The grinding disc is mainly composed of a disc body, a lining plate, a pressure block, a retaining ring, a scraper plate, an air ring, and a wind deflector. The primary function of the grinding disc is to support the material bed and transmit the force generated by the grinding roller to the lower speed reducer. It also transmits the torque of the reducer to the grinding area. The grinding disc forms an annular cavity with the air duct, and the wind flows out from this cavity and enters the grinding chamber through the ventilation ring.
With the rapid development of modern science and technology, the vertical roller mill will become more and more large, which will inevitably affect the quality and structural dimensions of its main components such as grinding discs, grinding rollers, swing arms, swing arms, etc. Therefore, it is necessary to optimize the design of these vertical roller mill parts.
You will be beaten if you are behind. Therefore, when the vertical roller mill is in the grinding industry, it is necessary to fight back and update, otherwise, it will lag behind, so the vertical roller mill needs to be optimized.
The optimization of the vertical roller mill is divided into two stages:
① Perform topology optimization. That is, the main purpose of clarifying the good shape, stiffness, volume, or reasonable natural frequency of the part is to clarify the direction of optimization.
② Optimize the size. The main purpose is to determine the specific dimensions of the optimized part. Size optimization is usually performed after topology optimization is completed.
When sizing, you first need to define a reasonable range of variation for the two design variables. According to the static strength analysis of the vertical grinding disc, it can be known that the location of the stress concentration of the grinding disc is at the corner of the lower part of the grinding disc, and as the thickness mouth of the stress concentration increases, the large stress value decreases. After analyzing the strength of the grinding wheel of the vertical roller mill, it is found that the large stress of the grinding disc is far smaller than the allowable stress of the grinding disc, and the key part of the stress concentration is at the lower corner of the grinding disc. The topology optimization clarifies the optimization direction of the grinding disc and provides alternative input parameters for size optimization. After optimization, the quality of the grinding disc is reduced under the condition that its large stress and large displacement remain basically unchanged.
The above phenomenon shows that the quality of the grinding disc can be reduced by appropriately increasing the size of the stress concentration part and greatly reducing the size of other parts that have less influence on the stress of the grinding disc. Therefore, the thickness opening at the stress concentration point can be reasonably defined for optimal design.