多回路通风机组合开关风电瓦斯闭锁功能的优化设计

针对矿用隔爆型多回路通风机组合开关在结构上存在的缺陷,提出优化设计的改造方案,对瓦斯监控系统分站控制程序进行补充,使双通风机、双电源组合开关性能更加可靠,实现了风电瓦斯闭锁功能和对掘进工作面通风的不间断控制,提高了矿井通风设施的可靠性。

图解维修暖风及通风控制开关的拆装

空调系统工作情况好坏与否,直接影响到汽车驾乘环境的舒适程度。而暖风及通风开关出现故障是导致空调系统不正常运行的重要因素之一。一般暖风及通风开关在运行一段时间后,有可能出现以下故障,并需要及时得到维修: (1)控制操纵拉线的摇臂机构断裂,需更换暖风及通风控制盒总成。 (2)空调面板照明灯不亮,需更换照明灯泡。 (3)暖风及通风开关内的开关调速电路板失效,导致鼓风机不转,需更换电路板。

A DOUBLE BLIND OBSERVATION FOR THERAPEUTIC EFFECTS OF THE TONG LUO KAI BI TABLETS ON RHEUMATOID ARTHRITIS

The therapeutic effects of the Tong Luo Kai Bi Tablets [symbol: see text] in 120 patients with rheumatoid arthritis were observed in this clinical trial by the randomized double blind method. Both the observed group and the control group each had 60 patients. In the observed group treated with the Tong Luo Kai Bi Tablets, 1 case (1.7%) was cured clinically, 27 cases (45.0%) improved markedly, 26 cases (43.3%) improved, with a total effective rate of 90.0%. In the control group treated with Rheumatic Semen Strychni Tablets [symbol: see text], no case was cured, 16 cases (26.7%) improved markedly, 33 cases (55.0%) improved, with a total effective rate of 81.7%. Statistical data showed the Tong Luo Kai Bi Tablets had much better therapeutic effectiveness clinically than the Rheumatic Semen Strychni Tablets (P