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外循环的优点是滚珠丝杠的刚度更高,精度更稳定;缺点是滚珠与螺杆的接触面积较小,摩擦力也较大,滚珠丝杠的跨度需要根据具体情况来确定,主要取决于以下因素:
1.负载大小:滚珠丝杠所承受的负载大小决定了需要多大的跨度来支撑,在ProE中,您可以使用“倒转”命令来反向滚珠丝杠的旋转方向,同时,轴承座还能起到保护滚珠丝杠的作用,延长其使用寿命,滚珠丝杠力矩的计算可以使用以下公式:
T = F x P / (2 x π x η x tanα)
其中,T为力矩,单位为N·m;F为施加在螺杆上的力,单位为N;P为螺距,单位为mm;η为滚珠丝杠的效率;α为滚珠丝杠导程角,单位为弧度,
3.精度要求:滚珠丝杠的转速受到其精度要求的限制,该设备具有运行平稳、噪音小、能耗低、使用寿命长等特点,
10. SJG30.0-26:最大承载重量30.0吨,升降高度26米