Explosion-proof performances of all motors and electric components of QB explosion-proof crane satisfy standards stipulated by GB3836.2 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 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 ll B or ll 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 for details). This product is generally controlled on the ground,but control from the driver' s cabin is also allowable.

Main Features

1. Minimum IP55 for electrical enclosure

2. All crane motors are equipped on the overhead crane with insulation class F and Temperature Rise Class B to provide a longer operational life span

3. Electronic overload protection c/w warning horn.

4. Noise level below 85 dB(A) at full load

5. Two speed control via pole changing for the hoisting motion, inverter control for trolley and bridge motion for smooth and precise operation.

6. Thermal protection for pole-changing and 3 PTC thermistors for inverter drive.

7. Crane rake with asbestos-free lining which activates automatically in case of power failure.

Explosion Proof Crane Design Standard:

1. Design rules for cranes GB/T3811-2008

2. Safety rules for lifting appliances GB6067.1-2010

3. Explosion-proof bridge cranes JB/T5897-2006

4. Explosion-proof beam crane JB/T10219-2011

5. Explosive gas environment used electrical equipment part 1: General requirement

6. Explosive gas environment used electrical equipment part 2. Flame-proof type”d”

Safety is the most important issue for cranes. 

Our safety device for QB type overhead crane: overload limiter, limit switch (lifting and traveling), interlock protection device, buffer, overhaul cage, rail clear plate, protective cover, bus bar prevent plate, anti-collision device, main isolating switch, emergency stop system, motor overload protection, and others you required.