热镀锌机组沉没辊系受力模型及影响因素

 热镀锌机组沉没辊系在锌锅内工作状态下受力情况复杂,受外界影响较大。充分考虑热镀锌机组设备与其工艺特点,首先分析沉没辊系在工作状态下受力情况,分别建立矫正辊插入量与包角的关系式、基于辊面锌渣沉积厚度的辊面摩擦因数经验模型。随后采用条元离散法建立沉没辊系辊面接触压力、摩擦驱动力矩模型,基于简支梁模型确定沉没辊系轴端支撑力、轴端摩擦阻力矩模型。最后将沉没辊系受力模型应用于国内某热镀锌机组镀锌工艺段,以典型规格带钢确定沉没辊系受力影响因素,并依据机组实际工况及板形要求来确定生产工艺参数的5种不同水平,来分析其对辊系受力状态的影响规律,为沉没辊系工艺优化提供指导依据。结果表明,4种工艺参数对辊系接触压力及摩擦力矩影响都存在差异性,矫正辊插入量与辊面接触压力呈现非线性关系;带钢张力对各辊接触压力影响程度不同,其中沉没辊受到的影响最大,而其余两辊受到张力几乎不影响;辊面平均摩擦因数、带钢速度对辊的接触压力几乎不影响;辊系摩擦驱动力矩、轴端摩擦阻力矩随着矫正辊插入量及辊面平均摩擦因数增大都呈现出不同程度增大。带钢张力与沉没辊摩擦驱动力矩、轴端摩擦阻力矩呈线性变化关系,而带钢张力对其余两辊影响很小。带钢速度对辊系的摩擦驱动力矩、轴端摩擦阻力矩影响很小。

Stress model and influence factors of sunk roll system in hot dip galvanizing unit

The stress of sunk roll system of hot dip galvanizing unit is complicated under the working condition of zinc pot,which is greatly affected by the outside. Taking full account of the equipment and process characteristics of the unit. Firstly,the stress of Sunk roll system under working condition was analyzed,and the relationship between the insertion quantity of the corrected roll and the wrap angle of the roll system and an empirical model of roll surface friction coefficient based on the deposition thickness of zinc slag on roll surface were established. Then,the contact pressure model and friction driving moment model of sunk roll system surface were established by strip element discrete method,and the axial end supporting force model and friction resistance moment model of sunk roll system were determined based on the simplified beam model. Finally,the force model of sunk roll system was applied to the galvanizing process section of hot dip galvanizing unit in the domestic,and the influencing factors of the system force were determined in a typical steel strip,and five different levels of production process parameters to analyze the process parameters on the influence law of roll system force condition according to actual working condition and the requirement of flatness,which provided a basis for guidance in process optimization of sinking roll system. The results show that the influences of the four process parameters on the contact pressure and friction moment of the roller system are different,and the contact pressure of the roller surface is nonlinear relationship. The influence of strip tension on the contact pressure of each roller is different,which is the most affected for the sunk roller among three rollers,while the other two rollers are almost not affected by the tension. The average friction coefficient of roller surface and strip speed have little influence on the contact pressure of roller. The friction driving moment of the roller system and the friction resistance moment of the shaft end increase with the increase of the insertion amount of the corrected roller and the average friction coefficient of the roller surface. There is a linear relationship between strip tension and friction driving moment and shaft end friction resistance moment of sunk roll,while strip tension has little effect on the other two rolls. Strip speed has little effect on the friction driving moment and shaft end friction resistance moment of roller system.