QB Explosion-Proof Crane

All motors and electrical components of the QB explosion-proof crane comply with GB3836.2 (“Explosive Atmospheres – Part 2: Equipment Protection by Flameproof Enclosure ‘d’”) and JB/T5897 (“Explosion-Proof Cranes”) standards.

The crane has obtained explosion-proof certification after testing by government-designated laboratories. It carries the explosion-proof marks Exd II BT4 and Exd II CT4, and is suitable for Zone 1 and Zone 2 hazardous areas where explosive gas or vapor mixtures do not exceed Group IIB/IIC and have an ignition temperature class not lower than T4 (refer to GB3836.1 for details). The crane is typically controlled from the ground, with cabin control also available.

Main Features

Electrical enclosures rated IP55 minimum

All motors feature Class F insulation with Class B temperature rise for extended service life

Electronic overload protection with audible alarm

Noise level below 85 dB(A) at full load

Two-speed hoisting (pole-changing) and inverter-controlled trolley/bridge travel for smooth, precise operation

Thermal protection: pole-changing motor protection and PTC thermistors for inverter drives

Asbestos-free brake linings that engage automatically upon power loss

Safety Devices
Safety is our top priority. The QB crane includes: overload limiter, lifting/travel limit switches, interlocking protection, buffers, maintenance cage, rail sweeps, protective covers, busbar guards, anti-collision devices, main isolating switch, emergency stop system, motor overload protection, and other required safety devices.