建筑施工中常用的卷扬机(图1),按速度分,大致有两类:一类是慢速(M);另一类是快速(K)。所谓慢速卷扬机是指,卷简上的钢丝绳平均卷进速度,每分钟为9～12米。这种卷扬机速度慢,多用于位移不大、而需要牵引力很大的地方。如用于冷拉钢筋和配合扒杆用于重大设备整体安装等。快速卷扬 The commonly used winch in construction (Figure 1) is divided into two categories according to speed: one is slow (M); the other is rapid (K). The so-called slow hoisting machine refers to the average rolling speed of steel wire ropes, which is 9 to 12 meters per minute. This type of winch has a slow speed and is used in places where the displacement is not large and where great traction is required. Such as for cold-drawn steel bar and with the mast for the installation of major equipment as a whole. Fast winch