Door curtain anti-dropping device for electric rolling door

摘要

A door curtain anti-dropping device comprises at least one rotating shaft, a brake mechanism, a rotational speed detecting module, and a control circuit, the rotating shaft being coupled to the winding shaft, the brake mechanism being used to brake the rotating shaft, the rotational speed detecting module being used to detect the rotational speed of the rotating shaft. When the door operator drives the winding shaft to rotate, the control circuit controls the brake mechanism to release the brake and to drive the rotating shaft and winding shaft. Once the chain is broken, an abnormal rotational speed of the winding shaft is detected by the rotational speed detecting module, the control circuit switches off the power source immediately to make the brake mechanism lock the winding shaft.

主权项

1. A door curtain anti-dropping device for a rolling door, the electric rolling door comprising a door operator (1) and a door curtain (D) having a winding shaft (A) and a plurality of serially connected door slats wound about the winding shaft, the door operator (1) comprising a driving shaft (11) coupled to a first end of the winding shaft (A) to wind or the plurality of door slats, the door curtain anti-dropping device comprising:
a first rotating shaft (21) having one end coupled to a second end of the winding shaft (A) of the door curtain (D) and driven together with the winding shaft (A); a reducer mechanism (30) for reducing the rotational speed of the first rotating shaft (21), the reducer mechanism having an output end (301) and an input end (300) coupled to the other end of the first rotating shaft (21); a brake mechanism (50) comprising a central shaft (51), a linkage disc (53), a first movable brake disc (57), an elastic element (59) and an electromagnetic generator (60), the central shaft (51) firmly connected to a housing (20), the linkage disc (53) pivoted on the central shaft (51) and coupled to the output end (301) of the reducer mechanism (30), the linkage disc (53) being rotatable with respect to the central shaft (51), the first movable brake disc (57) pivoted on the central shaft (51) and constantly receiving an elastic force from the elastic element (59) to push and brake the linkage disc (53), the electromagnetic generator (60) disposed on one side of the first movable brake disc (57), the electromagnetic generator (60) electrically excited to attract the first movable brake disc (57); a rotational speed detecting module (62) comprising at least one detector (621) disposed on one side of the linkage disc (53), for detecting a rotational speed of the linkage disc (53); and a control circuit electrically connected to the electromagnetic generator (60) and the rotational speed detecting module (62), wherein, when the door operator (1) is running, the control circuit electrically excites the electromagnetic generator (60) so as to attract the first movable brake disc (57), and then to release the linkage disc (53) and to drive the first rotating shaft (21) and the winding shaft (A); and when the door slats drop down and the detector of the rotational speed detecting module detects that the linkage disc (53) rotates at a speed higher than a predetermined speed, the control circuit is activated to cut off the power of the electromagnetic generator (60) so that the first movable brake disc (57) of the brake mechanism (50) brakes the linkage disc (53) to prevent the winding shaft (A) from rotating continuously.