Cables designed for cranes and traveling hoists are suitable for mobile electrical equipment operating at AC rated voltages of 450/750V or lower. Their construction allows for frequent bending without kinking or tangling, making them ideal for applications such as festoon systems (traveling cables) and portal cranes. They meet the demands of various scenarios involving movement and bending. These cables are suitable for electrical connections between mobile devices in harsh environments found in power generation, metallurgy, chemical processing, and port operations. Cable selection depends on the specific operation and crane model; let’s explore how to choose the right crane cable.
1. When using festoon systems (or cable trolleys), precautions must be taken to prevent abrasion and excessive bending during movement. For cables with a diameter of less than 8 mm, the diameter of the suspension saddle (or bending support) should be at least 6.3 times the cable diameter; for diameters greater than 8 mm, it should be at least 8 times; and for diameters exceeding 12.5 mm, it should be at least 10 times the diameter. For flat cables, the cable thickness is treated as equivalent to the diameter of a round cable. During installation, all cables should be of equal length and securely clamped; cables in the same layer should be arranged as tightly as possible to prevent uneven tensioning where one or a few cables bear excessive load. In suspension-type festoon systems using towing steel wire ropes, the spacing between adjacent trolleys during operation should be adjusted so that the angle between the suspension cables approaches 120 degrees, ensuring the towing wire rope is properly tensioned and loaded.
2. For power supply systems using cable reels, measures must be taken to prevent abrasion during movement. If the cable outer diameter is 21.5 mm or less, the reel core diameter should be at least 10 times the cable diameter; if the diameter exceeds 21.5 mm, the reel core diameter should be at least 12.5 times the cable diameter. The crane's cable reel must be capable of automatically winding the cable, and the drive torque of the reel should not be less than the torque required for winding. During cable deployment, the pulling force exerted on the cable should be minimized; however, if the cable is subjected to high-speed winding or carries significant weight, a load-bearing steel wire rope core should be incorporated to handle the tension.
Continuous improvements in cable design and the use of imported materials have significantly enhanced durability, while advanced manufacturing equipment ensures precision production. These cables are designed to withstand prolonged winding and dragging operations, offering excellent tensile strength, high dielectric strength (under both static and winding conditions), and superior wear resistance. The use of high-quality materials provides enhanced resistance to abrasion, UV radiation (cracking), and aging, as well as excellent flexibility, bendability, and oil resistance. This effectively resolves common performance issues—such as cracking, breakage, and premature aging—associated with standard cables in demanding operating environments, resulting in a significantly longer service life.
