QB explosion proof overhead crane: 1) Lifting capacity: 5-20t 2) Span: 10.5-31.5m 3) Duty grade: A5 QB Explosive proof overhead crane applicable to workshop, warehouse etc, where has the mixture of easily flammable and explosive materials. This crane model recommended by the WTO and match technical standard JB/T5897-91. The working grade is intermediate. QB Type Explosion-proof Overhead Crane Explosion-proof performances of all motor, and electric components of QB explosion-proof crane satisfy standards stipulated by GH 3836.2--2000Explosion proof electric equipment Working in Explosive Gas Environment Part 2: Flame-proof Type "D", and the performance of the crane satisfies demands in used in JB/T5897--1991Explosion 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, ExdII CT4 respectively. This product is suitable for areas where the explosion-transmission is not higher than IIB or IIC and the ignition temperature group of inflammable gas or explosive mixture of steam and gas is not lower than T4. Characteristics: A5 duty crane with a capacity of 5t-20 tons, span 10.5-31.5m, ambient temperature is -25C to +40C. Crane controlled on the ground or from the driver' cabin.
