The blast-proof performance of all electric machines and electric appliances of QB model blast-proof overhead crane with hook conforms to the prescriptions of GB3836.2000 Blast-proof Electrical Apparatus for Explosive Atmosphere Part two: Flameproof Type; the performance of complete machine conforms to the prescriptions of JB/T5897-2006 Blast-proof Bridge Crane. The crane is qualified inspected by inspection unit of blast-proof product which is appointed by the state. The crane has got Certification of conformity of An Instrument for Explosive Atmosphere. The signs of blast-proof are ExdII BT4 and ExdII CT4 respectively.
 
The product is applicable to the place in the factory where the capability of transmitting-explosive is no higher than gradceII B or IIC, and where has mixture of detonating gas which is composed of flammable gas or steam, whose ignition temperature team belongs to T1-T4 team, and air. The applicable danger area is Area 1 or Area2 (see GB3836.1-2000 for detail).
 
The product shall be operated on ground: it is also can be cab-operated as the user needs. The working class is middle.  
QB type flameproof explosion-proof performance conforms to the bridge crane all motors, electrical appliances GB3836.2-2000 "explosive gas environment with electrical equipment part 2: flameproof" d "", the whole machine performance conform to JB/T5897-2006 with the provisions of the standard for explosion-proof bridge crane, the explosion-proof products designated by the state inspection unit tests qualified, has obtained the" explosion-proof certification ". Explosion-proof marks respectively ExdII BT4, CT4 Exd II.
This product is suitable for factory explosion-proof capability is not higher than B or C grade II, II category is not lower than the ignition temperature of T4 group of flammable gas or vapor and air form the sites with explosive air mixture, and applies the danger zone for 1 or 2 area (see GB3836.1-2000).
This product is generally for ground operations, according to user needs can also be the driver chamber operation. Work level is intermediate.

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