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|1. (WO2018120500) ANTI-FALLING HOIST TRANSMISSION|
|Applicants:||CHINA UNIVERSITY OF MINING AND TECHNOLOGY
|Title:||ANTI-FALLING HOIST TRANSMISSION|
An anti-falling hoist transmission comprises a reel (3), a planetary gear train, a clutch, a right brake, a left brake, a motor (25), a high-speed shaft (28), a transmission gear mechanism, a duplex gear pump (34), an oil tank (33), and a two-position four-way solenoid directional valve (32). During normal lifting, the left and right brakes are in a non-braking state, the clutch is engaged, and the motor controls the rotational speed of the reel (3) by means of the planetary gear train. In case of a sudden power failure accompanied by a brake failure, the clutch disengages, and the left and right brakes perform braking, the planetary gear train changes into a fixed-axis gear train, the left and right brakes respectively stop a sun gear (4) and a planetary gear carrier (7), and ultimately the reel (3) is stopped. When the rotational speed of the reel (3) is close to zero, the duplex gear pump (34) stops working, the left brake is released, a load continues to rotate the reel (3), and the duplex gear pump (34) continues to work. The process is repeated continuously until the load lands at a low speed. By means of the structure, the hoist transmission of the invention can prevent an accident caused by a load landing at a high speed in case of a sudden power failure accompanied by a brake failure.