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东北内蒙煤炭公司和天津市第一机械工业局于1983年12月在北票矿务局召开多绳提升机交流电控JKMK/J—□系统完善化技术鉴定会。有全国煤炭系统40个单位68名代表参加。系统完善工作是由天津电气控制设备厂、洛阳矿山机械研究所会同北票矿务局在北票冠山主井进行。冠山主井深1000m,箕斗容重12t,提升机为2.8×6型,系多绳提升机交流电控JKMK/J-□配KDG-250/460型硅控低频电源装置的系统。会议通过了鉴定。该系统完善化内容主要有可调闸及安全闸投入全行程速度闭环运行,对具有尾绳的多绳提升机正力提升,用速度继电器自动切换转子电阻,低频爬行自动投入。在负力减速时,在减速点投入低频制动,爬行时自动转入低频爬行。系统采用伺服
Northeast Inner Mongolia Coal Company and Tianjin No.1 Machinery Industry Bureau held a technical appraisal meeting of JKMK / J- □ system for multi-rope hoist AC electric control in Beipiao Mining Bureau in December 1983. There are 68 representatives from 40 units of the national coal system. System improvement work by the Tianjin Electric Control Equipment Factory, Luoyang Mining Machinery Research Institute in conjunction with Beipiao Mining Bureau in the main ticket Beishan main bore. Guanshan main well depth 1000m, skip weight 12t, hoist 2.8 × 6 type, multi-rope hoist AC electric JKMK / J- □ with KDG-250/460 silicon controlled low-frequency power supply system. The meeting passed the appraisal. The improvement of the system mainly has adjustable gate and safety gate into full-stroke closed-loop speed operation. The multi-rope hoist with tail rope is lifted positively, the rotor relay is automatically switched by speed relay, and the low-frequency crawling is automatically put into operation. In the negative deceleration, the deceleration point into low-frequency braking, crawling automatically into low-frequency crawling. The system uses servo