礦山起重機械廠家設計生產的防爆天車、防爆桁吊、防爆雙梁橋式起重機產品簡介：
QB型5-50/10噸防爆橋式起重機的結構組成和QD型吊鉤橋式起重機相同，由雙主梁橋架、大車運行機構、小車運行機構，起重小車、電器、司機室等組成。取物裝置也是吊鉤，只不過防爆橋式起重機的電機、電器、車輪、吊鉤等都是防爆的。
QB型5-50/10噸防爆橋式起重機所有電機、電器防爆性能符合GB3836.2-2 000《爆炸性氣體環(huán)境用防爆電氣設備第2部分：隔爆型“d”》、整機性能符合JB/T5897-1991《防爆橋式起重機》標準之規(guī)定，防爆標志為ExdIIBT4、ExdIICT4，但ExdIICT4級別高。
本防爆行吊產品適用于工廠內傳爆能力不高于IIB或IIC級，引燃溫度組別不低于T4組的可燃性氣體或蒸氣與空氣形成的爆炸性氣體混合物的場所，適用的危險區(qū)域為1區(qū)或2區(qū)。本產品有地操和空操兩種，工作級別為中級。
本產品一般為地面操作，根據(jù)用戶需要也可以司機室操作。工作級別為中級。
Explosion-proof performances of all motors and electric components of QB explosion-proof crane satisfy standards stipulated by GB3836.2-2000 Explosion-proof Electric Equipment Working in Explosive Gas Envircmment Part2：Flame-proof Type“D”，and the performance of the crane satisfies demands in JB／T5897-1991 Explosion-proof Crane．The crane has obtained Explosion-proof Certificate after passing examinations by units designated by the government to test explosion-proof products．The explosion-proof marks are Exd II BT4 and Exd II CT4 respectively．
This product is suitable for areas where the explosion。transmission is not higher than II B or II C and the ignition temperature group of inflammable gas or explosive mixture of steam and gas is not lower than T4．Applicable dangerous zones are zone 1 and zone 2(please refer to GB3836.1-2000 fordetails)．
This product is generally controlled on the ground，but control from the driver’s cabin is also allowable．The working grade is intermediate．
注：5-10t起重機無副鉤
Note：5-10t crane does not have a auxiliary hook．
