| 摘要 |
In a door operator having a driving end and a weight carrying end, an electric motor mechanism, a first electromagnetic clutch mechanism, a combination pull-chain disc and brake, a second electromagnetic clutch mechanism are disposed in sequence between the driving end and the weight carrying end, the mechanisms being connected by rotating shafts and a hollow shaft, in which when the electric motor mechanism is electrically powered, the first electromagnetic clutch mechanism moves the hollow shaft to separate from a brake device, and the second electromagnetic clutch mechanism connects the driving end to the weight carrying end; and when the electric motor mechanism is not electrically powered, the first electromagnetic clutch mechanism connects the hollow shaft to the brake device, and the second electromagnetic clutch mechanism separates the driving end from the weight carrying end. |
| 主权项 |
1. A machine mechanism (1) of a door operator for automatically unwinding a curtain of a rolling door wound on a winding shaft in a power failure, the machine mechanism comprising an electric motor unit (20), a first electromagnetic clutch unit (30), a combination pull-chain disc and brake (40), and a second electromagnetic clutch unit (60), which are accommodated within a housing (10) in sequence, wherein:
a first rotating shaft (13) passes through the first electromagnetic clutch unit (30), the combination pull-chain disc and brake (40), and the second electromagnetic clutch unit (60), in which a right end of the first rotating shaft (13) is detachably connected to a left end of a central rotating shaft (11) of the electric motor unit (20); a right end of a second rotating shaft (17) is connected to a left end of the first rotating shaft (13) via the second electromagnetic clutch unit (60), so that a torque from the electric motor unit (20) or the combination pull-chain disc and brake (40) is transmitted to an output shaft (19) through the first rotating shaft (13) and the second rotating shaft (17), an output wheel (191) being fixed on the output shaft (19); a hollow shaft (15) slidably sleeves on a right side portion of the first rotating shaft (13), the first electromagnetic clutch unit (30) being disposed over a right side portion of the hollow shaft (15) to surround an outer periphery of the hollow shaft (15) and fixed to the housing (10), in which when the electric motor unit (20) is electrically powered, the first electromagnetic clutch unit (30) makes the hollow shaft (15) slide to separate from the central rotating shaft (11), and when the electric motor unit (20) is not electrically powered, the first electromagnetic clutch unit (30) makes the hollow shaft (15) slide to connect to the central rotating shaft (11); an electric energy storage device is provided, for electrically powering the second electromagnetic clutch unit (60) in the power failure; the combination pull-chain disc and brake (40) comprises a pull-chain disc device (41) and a brake device (50), in the pull-chain disc device (41) comprises a end disc (531) and a pull-chain disc (41′), the end disc (41) being connected with a left end of the hollow shaft (15) axially slidably, the pull-chain disc (41′) being supported on the end disc (531) and rotated by a pull-chain (42) wound on an outer periphery of the pull-chain disc (41′) for driving the end disc (531) to be rotated together with the hollow shaft (15); inside the pull-chain disc (41′), there is an axial, left end-opened annular space as an accommodating portion (410) for the brake device (50); and the brake device (50) comprises a shaft hub (53) secured on the housing (10) and at least one torsional spring (51) coils around the shaft hub (53); the torsional spring 51 is actuated with a rotation of the hollow shaft (15) and the end disc (531) so as to shrink its inner diameter and constrict the shaft hub (53), resulting in the central rotating shaft (11) being in a brake state; or the torsional spring (51) is actuated by a rotation of the pull-chain disc (41′) so as to enlarge its inner diameter and loosen the shaft hub (53), resulting in releasing the braking state; and the second electromagnetic clutch unit (60) comprises a second electromagnet (601), fixed on the housing (10); a driving disc (602), fixed at a left end portion of the first rotating shaft (13) and facing the second electromagnet (601); a second bush (14), secured on the second rotating shaft (17), a right end of the second bush (14) being formed with a driven disc (141) facing the driving disc (602); and a first brake shoe (142), located between the driving disc (602) and the driven disc (141), the first brake shoe (142) be connected with the driven disc (141) via an elastic plate (143) for the first brake shoe (142) being constantly against the driven disc (141); so that: in the case of normal power supply, after the curtain of the fireproof rolling door is wound by the electric motor mechanism (20), a weight of the curtain of the fireproof rolling door constantly acts on the output wheel (191), and a torque generated by the weight of the rolling door is transmitted to the torsional spring (51) through the hollow shaft (15) and the end disc (531), so that the inner diameter of the torsional spring (51) is shrunk to constrict the shaft hub (53) and keep the central rotating shaft (11) in a brake state; in the case of power failure, the second electromagnetic clutch unit (60) makes the first rotating shaft (13) and the second rotating shaft (17) separate, so that the fireproof rolling door falls down due to the weight of the curtain; in the case that the curtain of the fireproof rolling door has fallen down, the second electromagnetic clutch unit (60) is electrically powered by the electric energy storage device to connect the first rotating shaft (13) and the second rotating shaft (17), and hence the pull-chain disc (41′) can be rotated by puling a pull-chain (43) the inner diameter of the torsional spring (51) is enlarged to release the braking state, to the effect that the rotation of the pull-chain disc (41′) is transmitted to the output wheel (191) via the hollow shaft (15), the central rotating shaft (11), the first rotating shaft (13), and the second rotating shaft (17) in sequence so as to wind the curtain of the fireproof rolling door to rise up. |
