Tramcar narrow-gauge railway transport vehicle mines transport coal, ore and waste rock and other bulk materials, Shandong hoppers, tub, generally required traction locomotive or winch. Coal narrow gauge mine car safety: homemade materials, vehicles, flatbed, shelf trucks, special dedicated trucks and other vehicles have a unified number, Gansu hoppers, tub, and the establishment of accounting, card and license plate; management, inspection and maintenance by fixed tub regulations. Tramcar narrow-gauge railway transport vehicle mines transport coal, ore and waste rock and other bulk materials, hoppers, tub suppliers, are generally required traction locomotive or winch. Harvesters basic components: the "Coal Mine Safety Regulations" provides that: tilting roadway transportation, connecting hoppers, tub, tub connection between the tub and the rope must use a connection between the device does not fall off on their own. Thus, the connector plug the tub must have anti-shedding devices. Years of use showed that the anti-fall device lock ring style better.