Hean Dowellcrane Show Difference Between Single Girder & Double Girder Crane
Single beam is a beam, hanging above the electric hoist: double beam with QD and LH two models, QD double beam is equivalent to a single beam in terms of the main beam is two beams, the above is a small car, with a hoist as a lifting mechanism LH is also a small car, but uses an electric hoist...
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