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目前国内外钟式高炉炉顶的大小料钟强迫压下操纵装置,几乎都采用如图1所示的“双等长摆杆铰链四杆机构”来完成冶炼工艺所提出的要求。当AB=DC,AD>BC(否则不是双摆杆机构)时,连杆BC的中点G将随着连杆的运动而描绘出一条封闭而对称的平面曲线轨迹。若机构各杆的尺寸选择得当,则该曲线的某一段将近乎是直线。大小料钟的吊杆就铰结在G点随之做垂直于地面的近似直线运动。这就是有些书上所称的瓦特(watt)近似直线机构。本文试以数学分析的方法证明该曲线上某一段的近似直线性,并给出各参数间的关系式和编差计算方法,这将对于机构的运动学和动力学计算提供理论上的依据。文末还附有例题。
At present, the size of bell-type blast furnace dome at home and abroad forcing down the manipulator, almost all of the requirements of the smelting process are used to complete the smelting process as shown in Figure 1 “double-long swing rod hinge four-bar mechanism.” When AB = DC, AD> BC (otherwise not a double pendulum mechanism), the middle point G of the link BC will follow the movement of the link to draw a closed and symmetrical plane curve trajectory. If the size of each bar is properly chosen, a section of the curve will be almost straight. The size of the material boom bell hinged at the G point then perpendicular to the ground near the linear motion. This is what some call the analogy of a watt straight line. This paper attempts to prove the approximate linearity of a section of the curve by the method of mathematical analysis, and gives the relational formula and assembly difference calculation method of the parameters, which will provide a theoretical basis for the kinematics and dynamics calculation of the mechanism. The end of the text also accompanied by examples.