鲁妺1 金勇2
1 华泰永创（北京）科技股份有限公司， 辽宁 鞍山 114000
2 鞍山华泰环能工程技术有限公司， 辽宁 鞍山 114000
摘要：炉门框用螺栓紧固在保护板上，形成一个强固的密封框。炉门框工作环境恶劣，忍受着高温和还原性腐蚀（荒煤气）侵蚀．间歇经受启闭炉门的机械力的冲击,工作中常发生上下挠曲和侧向弯曲变形,以至影响炉门刀边密封和顺利推焦。炉门框结构简单，其上有炉门挂钩和悬挂炉门的导轨。炉门框断面呈L形,L形断面炉门框的内外两面温差大，断面内的温差应力大，易于变形。因此炉门框厚度减薄设计时，必需核算炉门框得强度。
关键词： 炉门框 厚度减薄 强度核算
Accounting of thickness of furnace door frame
Lu Wei 1 Jin Yong 2
1 Huatai Yongchuang (Beijing) Technology Co., Ltd., Anshan, Liaoning 114000
2 Anshan Huatai Ring Energy Engineering Technology Co., Ltd., Anshan, Liaoning 114000
Abstract: The furnace door frame is bolted to the protective plate to form a strong solid sealing frame. The furnace door frame has a poor working environment and suffers from high temperature and reductive corrosion (waste gas) erosion. Under the impact of the mechanical force of the opening and closing furnace door, deflection and lateral bending deformation often occur in work, which even affect the edge seal and smooth focus of the furnace door. The furnace door frame structure is simple, it with the furnace door hook and the hanging furnace door guide rail. The section of the furnace door frame is L-shaped, the temperature difference between the internal and outer sides of the L-shaped section is large, and the temperature difference stress in the section is large, which is easy to deform. Therefore, when the thickness of furnace door frame is reduced, the strength of furnace door frame must be calculated.
Key words: furnace door frame thickness thinning strength accounting
一、炉门框结构图及强度计算
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1.1计算炉门框断面积F总：
根据图1.1所示，F1、F2处炉门框截面积可求（单位cm2），公式F1=26.25cm2,F2=72.5cm2。
求得：F总=F1+F2=98.75cm2
1.2计算炉门框坐标轴的形心yc:
y1=12.5-7.5/2=8.75cm
y2=5/2=2.5cm
yc=(F1 y1+F2 y2)/F总；求得yc=4.16cm。
1.3计算惯性矩Jx:
Jx1=2(3.5×7.53/12+4.592×26.25)=1352.169cm4≈1352cm4
Jx2=2(14.5×53/12+1.662×72.5)=701.645cm4≈702cm4
Jx=Jx1+Jx2=2054cm4
1.4横断面外半部的抗弯断面系数W:
W=Jx/(h－yc)=246.28cm3
h—炉门框总高度12.5cm;
1.5炉门框强度核算
炉门框工作温度小于300℃，许用应力按450kg/cm2计。该构件近似于多固定支点，在卡钩附近螺栓位置弯矩最大。
该断面弯矩：MA=PL1L22/L2
P—横栓力，吨；（16.5吨）
L1、L2—卡钩中心距离相邻固定螺栓距离，cm；（25cm）
L—固定螺栓距，即L=L1+L2，cm；
MA=16.5×1000×25×252÷502=103125（kg.cm）
炉门框断面处侧板拉应力计算：
=MA/W=103125/246.28=418.730713kg/cm2
二、炉门框结构强度计算结果
经过上述理论计算，炉门框断面处侧板拉应力值约为419kg/cm2＜450kg/cm2，故此强度够。可以根据业主方要求修改设计，将原100mm厚度减小至50mm。
参考文献
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