| 摘要 |
The invention relates to an elevator comprising an elongated hoistway (H) having a longitudinal direction; an elevator car (1) arranged to travel in said hoistway (H) along a path extending in said longitudinal direction; and a car speed monitoring arrangement comprising
an elongated flexible member (2) tensioned to extend in said hoistway (H) in said longitudinal direction;
a first roller (3), mounted rotatably on the car (1) and tensioned against a lateral side (S1) of the elongated flexible member (2) to roll along the surface thereof when the car moves relative to the elongated flexible member (2);
a second roller (4), mounted rotatably on the car and tensioned against a lateral side (S1) of the elongated flexible member to roll along the surface thereof when the car moves relative to the elongated flexible member;
the speed monitoring arrangement (70) being configured to detect rotation speed of the first roller (3) and the rotation speed of the second roller (4); and to trigger one or more predefined actions when one or both of these rotation speeds exceed a limit speed; and to compare these speeds with each other; and to trigger one or more predefined actions when these rotation speeds deviate from each other;
wherein said one or more predefined actions include at least actions for stopping movement of the elevator car (1). |
