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临界速度控制精度是减速顶主要性能指标之一,它直接决定溜放车辆速度的控制精度和安全连挂率。我们在这里提出“相对下滑速度”的概念,并根据由此作出的相对下滑速度曲线图分析了减速顶滑动油缸头部曲面形状、减速顶安装位置、车轮尺寸和车轮横动等因素对减速顶临界速度控制精度的影响,并定量计算了减速顶可能产生的最大临界速度误差△V临max。这个最大临界速度误差仅指上述因素影响所产生的临界速度误差,不包括由减速顶各零件的加工尺寸公差和速度阀在温度影响下的节流特性变化所产生的临界速度误差。
The critical speed control precision is one of the main performance indicators of the decelerating roof, which directly determines the control precision of the speed of the vehicle and the safety rate of hang-up. Here we put forward the concept of “relative sliding speed”. Based on the relative sliding speed curve we made, we analyzed the influence of such factors as the shape of the head surface of the deceleration top sliding cylinder, the installation position of the deceleration roof, the wheel size and the wheel traversing, Critical speed control accuracy, and quantitative calculation of the maximum possible deceleration of the top critical speed error △ V Pro max. The maximum critical speed error refers only to the critical speed error caused by the above factors. It does not include the critical speed error caused by the processing dimensional tolerance of each part of the speed reducer and the change of the throttle characteristic under the temperature influence of the speed valve.