6ES7 321-1BH50-0AA0
6ES7 321-1BH50-0AA0
6ES7 321-1BH50-0AA0
6ES7 321-1BH50-0AA0
起重机械的种类很多,其拖动系统的差异也较大,但基本特点则大同小异。为实现起重机不同运动要求,最基本的工作机构有以下四种:即起升机构、变幅机构、行走机构和回转机构。《联系人;欧先生》
《座机:0592-5709825》
《传真:0592-5917519》
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《 :2479261344》
《邮箱:2479261344@.com》起升机构是主要的功能机构,其正反转工作变换比较频繁,而且每次的起吊重量差别比较大,但工作时各类机构都属于恒转矩负载。
起重机械的起升机构主要由电动机、减速器、卷筒等部分组成,如图1所示。其作用可将原动机的旋转运动转变为吊钩的垂直升降运动,实现吊具垂直升降的目的功能不可缺少的部分。
由于重物在空中具有位能,重物上升时,是电动机克服各种阻力(包括重物的重力、摩擦阻力等)而做功,属于阻力负载;重物下降时,由于重物本身具有按重力加速度下降的能力(位能),因此,当重物的重力大于传动机构的摩擦阻力时,电动机成为了能量的接受者,故属于动力负载。但当重物的重力小于传动机构的摩擦阻力时,重物仍须由电动机拖动下降,仍属于阻力负载。
为使重物在空中停止在某一位置,在起升机构中还必须设置制动器和停止器等控制部件。为了适应不同吊重对作业速度的不同要求,起升速度应能调节,并具有良好的微动控制性能。微动速度一般在0.25~0.4m/min范围。
通过对起升机构分析不难发现,其工作中的主要有三种转矩:
(1)电动机的转矩TM,即由电动机产生的转矩是主动转矩,其方向可正可负;
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