目前,建造高大烟囱、井塔等施工中都需采用提升机。为保证安全,乘人罐笼(或人、物兼用)均设有安全装置,以防断绳时发生人身设备事故。楔块式安全卡就是其中最通用的一种安全装置。这种形式安全卡经过许多单位的使用,证明是行之有效的。但也有一些单位使用效果不太好。其原因有楔块磨损厉害,使间隙增大,起不到抱刹作用;也有作用力过大,间隙过小,平时磨损 At present, the construction of tall chimneys, towers and other construction are required to use hoist. In order to ensure safety, passenger cage (or both people and things) are equipped with safety devices to prevent personal equipment accident when breaking the rope. Wedge-type safety card is one of the most common type of safety device. The use of this form of security card after many units proved to be effective. But there are some units that do not work well. The reason for wedging powerful, so that the gap increases, can not catch the brake effect; there are too much force, the gap is too small, usually wear