Crane duty class grades how busy a machine is, using total working cycles over design life together with load state. China’s GB/T 3811 crane design code sets eight grades, A1 to A8. FEM 1.001, meanwhile, runs from 1Am to 4m:…
A top running overhead crane rides its bridge wheels on rails that sit on top of the runway beams, so loads travel straight down into the building columns. This design serves 5 to 500 tons at medium-to-high duty. An underhung…
Overhead crane inspections fall into four tiers: pre-shift checks every shift, monthly checks, one full annual inspection per year, and statutory periodic inspection. In China, the statutory visit runs every 2 years under TSG Q7015, the crane periodic inspection rule.…
A chain hoist lifts on welded link chain and serves light, intermittent duty below 5 tons. A wire rope hoist, on the other hand, lifts on multi-strand wire rope and covers 0.5 to 500 tons, which makes it the workhorse…
A semi-gantry crane is a hybrid structure. One side of the girder runs on a floor-standing leg over a ground rail. The other side rides directly on a runway supported by the building’s column brackets or wall framing, just like…
A compliant overhead crane carries seven categories of safety devices. The list starts with the load limiter, which alarms on overload and cuts hoisting before 1.1 times rated load. Then come the hoist-limit switch, travel limit switches for long and…
Yes. Chinese rules leave no room for interpretation. Every overhead or gantry crane rated at 3 tons or more needs certified people. Both the operator and the signalman must carry cards. First, the Q2 certificate is the legal ticket to…
A lifting magnet crane handles ferrous scrap with a round or rectangular electromagnet that produces a strong field the moment it energizes. Mainstream round magnets run 1.0–2.1 m in diameter and lift 5–32 tons of scrap per bite. The magnet…
A grab bucket crane handles bulk material with a self-opening and self-closing bucket attachment. Payload per bite follows one formula — in fact, the same arithmetic a supplier uses: bucket capacity × material bulk density × fill factor. Buckets run…
Replace it the moment its condition crosses the scrap line. The line is measurable. Visible broken wires within one lay length reach about 10 percent of all wires — roughly 10 to 12 breaks for the common 6×19 rope. Or…
