How is the Crane c hook self-balancing?

• First, the length of the C-shaped hook and the opening of the hook opening should be determined according to the size (length and maximum diameter and bore diameter) of the suspended coil. And determine the location of the hook hanging point.
• The C hook is subjected to the upward pulling force of the hook and the force acting on the weight of the coil and the weight of the spreader downward. The force of the coil acts on the center of the coil. The self-gravity of the spreader acts on the center of gravity of the spreader.
• The weight must also be considered. The counterweight is a C-hook that can reach equilibrium when unloaded.
• The section at both corners is affected by the shear force and bending moment. When calculating, the self-weight may not be considered. The safety factor shall be 6/7 times. According to the calculation of the cantilever beam, the bending stress of the section at the corner is calculated according to the material mechanics formula. The ratio of the allowable bending stress of the material to the calculated bending stress is the complete coefficient. When calculating the stiffness, it is necessary to calculate the deflection (deformation amount) of the hook end and also calculate it by the cantilever beam.
• The allowable deformation can be calculated by dividing the length of the cantilever beam by 350. The vertical section of the spreader is mainly subjected to tension. According to the tension calculation, the tensile stress is equal to the gravity of the coil divided by the cross-sectional area. Dividing the yield stress by the tensile stress just before is the safety factor. Take 6-7.
• The plate thickness should not be less than 10mm. According to the weight of the coil, the structural section should be determined. If the weight is small, the I-shaped section can be used, and the reinforcement can be added. The weight can be increased by using the box section and the reinforcing bar.
• The corner radius is 200. Above, to increase the strength, the calculation of the hook head also mainly considers the tensile stress and the size of the hook.

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