TV-3型电动葫芦是五十年代的老产品,体积大而笨重。在实际使用中,它采用的圆盘式电磁制动器吸铁常常吸不上,线圈经常烧坏;有时螺母还会飞出来,既不可靠,又不安全。因此,需要经常维修和更换零件,这既增加了备件堆放场地,又增加了费用。而且它的主电动机也由于产品的更新换代而被淘汰。随着生产的发展,TV-3型电动葫芦在多数工厂已被淘汰或闲置。为此,我们进行了改装。图1为TV-3型电动葫芦改装展开图。考虑到制动时间不宜太短,否则轴易折断,我们将主电动机换上了上海起重电机厂生产的ZD41-4型锥形转子制动异步电动机。由于ZD41-4型电动机的 TV-3 electric hoist is the fifties of the old products, bulky and bulky. In actual use, it uses the disc electromagnetic brake suction iron often do not get on, the coil often burn out; sometimes the nut will fly out, neither reliable nor safe. Therefore, the need for regular maintenance and replacement of parts, which not only increases the spare parts storage site, but also increased costs. And its main motor is also eliminated due to product replacement. With the development of production, TV-3 electric hoist in most factories have been eliminated or idle. To this end, we have been modified. Figure 1 for the TV-3 electric hoist modified expansion plans. Taking into account the braking time should not be too short, otherwise the shaft easy to break, we will put the main motor on the lifting motor factory in Shanghai ZD41-4 cone rotor brake induction motor. Due to ZD41-4 type motor