On the MD-type electric hoist motor slow falling accident

September 1994 to a research institute laboratories use a dual-speed steel at MD electric wire rope hoist lifting test article, slow drive on the hoist motor suddenly fall from the sky, causing the ground test into an injury accident.


Scene lifting equipment MD-type electric animal Lo has lost the function of the operation, falling to slow the drive motor on the ground has been broken, terrazzo song partial destruction on the ground a test member A leg was bouncing Motor injured; in lifting and transport equipment MD rent a two-speed electric hoist Lee, from the weight G = 2000kg, lifting height II = 6m, lifting speed Vn = 8 / 0.8m / min, the car speed Vt = 20m / min. MD electric hoist for the two-speed electric hoist, dual turbine structure (picture motor) drive unit, quick action from the main motor liter (8m / min) when. Child motor through a gear transmission ratio of 1:10 between action, picture motor slow lift (0.8m / min) when (Slow driving dynamometer). Slow motion main motor axis motor drive shaft.


Hoist drive motors are squirrel-cage motors, is characterized not control, there are no limitations smooth starting and braking, in order to improve electric hoist startup or braking when stationary, while the dual-motor or double winding Pole changing motors to achieve double-speed that is fast slow running, in order to start slow and steady braking, fast running normal operation Unfortunately, in recent years - a few from the MD-type wire rope motor hoist slow even detachment gourd body hurt every thing in small fall accident, has caused all aspects of attention and attention.
Wounding with this accident as an example, a slow drive motor accidents and hoist this off fixing bolts loose connection, resulting in a slow fall off from the mother to the drive motor from the air assault, MD electric hoist electric hoist as with CD also to non-return follow-operated. The accident occurred in the process is very simple. Hoisting equipment operator B do not realize the child on the hoist motor falling from the air, they simply move to focus on operating hoist operation. A laboratory technician busy doing experiments, not thought Huocongtianxiang. electric hoist sub motor mounting bolts loose because the connection from the body falling from the sky. Hit the terrazzo floor and bouncing on the experimenter A leg attack seriously wounded and hospitalized.

来自 “ ITPUB博客 ” ，链接：http://blog.itpub.net/30085872/viewspace-1675485/，如需转载，请注明出处，否则将追究法律责任。

转载于:http://blog.itpub.net/30085872/viewspace-1675485/