Standards for U-shaped hooks
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Dear experts: What is the technical name of this component – a U-shaped hook or a hanging ring? When using this component for lifting, is it required to be used vertically (in the direction of the purple arrow, i.e., 0°), or can it be used horizontally (in the direction of the red arrow, 90°)? Are there any requirements? Are there any standards? Thank you for answering.
Use the shackle as vertically as possible, at 0 degrees. However, when in use, it is common for two or more shackles to hook and lift at different points; that is, a single shackle is in the same direction as the steel wire rope, while the U-shaped part forms an angle with the direction of gravity or the force acting on the item being lifted. This angle cannot be 90 degrees – it can only be 0 degrees or less than 90 degrees ； The larger the angle, the greater the capacity of the shackle chosen, which is not cost-effective.
Is there any relevant standard that proves 0° is the optimal angle of force application?
Hello, is there any relevant standard that confirms that 0° is the optimal angle for applying force?
4. It is necessary to test lift any shackle by hanging it before use. The lifting points should be selected so that they lie on the same vertical line as the center of gravity of the load. http://www.sohu.com/a/113591619_425676
https://mp.wei*n.qq.com/s/0RAC_1RfUcCt-V5y8wdTkw The buckles: Many friends who design lifting lugs take various factors into consideration, such as the dynamic load factor, the lugs themselves, the local stress on those lugs, and the strength of the pins, among others. When designing lifting lugs, one should not focus solely on the strength calculations of these lugs; the compatibility with the lifting equipment must also be taken into account. 1. First, the design must be carried out in accordance with the national standards for shackles (with priority given to Juli S-BX type shackles), to meet the lifting requirements of the manufacturing plant. Non-standard shackles are rarely used and are expensive; it is advisable to avoid using them in the design process. 2. For the equipment used in overseas projects, the lug design must also correspond to the dimensions of internationally standard shackles (G2130, G2160) to meet the customer’s requirements for lifting on site. 3. In principle, the design of the lifting lugs should take into account the following aspects in conjunction with standard shackles: a. The shackle pin shaft D must be able to pass through the lug pin hole ； b. The thickness of the lifting lug plate (including the reinforcement plate) is less than the distance W between the openings of the shackles ； c. The distance “S” from the edge radius R of the lifting lug to the top of the shackle must be sufficient to accommodate the steel wire rope.