The hooks of bridge cranes include single hook, C-shaped hook, double hook, sheet hook and so on. The single hook is simple to make and easy to use, but it is not easy to be stressed. Suitable for medium and small bridge cranes weighing less than 80 tons. The double hook is in good stress state, can make full use of the hook body material, and is suitable for heavy cranes. The c-type hook is often used for loading and unloading ships, and the upper part is protruding to prevent it from hanging on the hatch. The steel plate hook is formed by riveting several steel plates. When some boards are cracked, the entire hook will not be damaged. The safety performance is good, but the weight is large. Suitable for heavy overhead cranes or steel drums.
The cross-sectional shape of the hook body of the bridge crane is circular, rectangular, trapezoidal and T-shaped. Among them, the T-shaped cross-section is the most reasonable, but the process is more complicated. The small hook adopts a round cross section, usually a trapezoidal cross section with a circular arc angle. The hooks of bridge cranes are generally formed by die forging. The head of the hook is a straight shank. (The hook hung on a steel wire rope is an eye) When the metallurgical bridge crane lifts heavy weight or hoisting high-temperature materials, a piece hook riveted with multiple steel plates should be used, and a backing plate is set on the hook head. It will not burst suddenly. High security, film can be replaced. The hook body of the board can only be made into a rectangular section, and the material of the hook body is underutilized and the weight is too large. Board hook heads usually have eyelets.
The safety trolley line of the bridge crane can be a seamless trolley line, and the transmission of the seamless trolley line adopts oxygen-free copper transmission. The conductivity is twice that of a good contact. It is easy to install, replace, and transport, and it is not easy to wear. The sliding contact line is not easy to be damaged and has a long service life. The seamless copper core is tightly integrated with the plastic shell to eliminate poor contact caused by vibration. It is safer and more reliable than traditional power supply. It is safe, convenient, and cost-effective, and is deeply loved by users.
The safety trolley line of the bridge crane can be a tubular trolley line, which is generally 4 meters long and cannot be bent. It has high conductivity, high safety factor and good waterproof effect. However, because the shell is made of hard plastic, it is easily damaged during operation and installation, and the installation process is also very complicated. Because its price is higher than that of seamless slide rails, it has been widely used.
The safety trolley line of the bridge crane can be a single-stage trolley line. Large-tonnage bridge cranes use long single slide lines. It is composed of guide rails, current collectors, isolators, sheaths, hangers, connectors, fixing clips, end caps, and heat patching. The sliding contact surface has good performance and no bad contact occurs. This work is very reliable. It can withstand short-circuit impulse current in harsh environments such as high temperature, high humidity, and high pressure. Strong mechanical properties, difficult rigidity, bending deformation causes malfunctions. Large heat conduction area and long life.
Most of the trolley wire failures are caused by poor contact, which is caused by insufficient current collector spring force or improper installation. Under the condition of keeping the sliding contact line in good condition, the wear resistance of the slip ring and the chamfer of the brush can be improved, and the pressure of the slip ring spring can be increased to make it run smoothly.
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