Double ring buckle, also known as butterfly buckle, connecting ring and link ring, is mainly used to connect the chain, lifting ring and hook in the chain sling. Widely used in metallurgy, iron and steel, power, port and other industries, as well as domestic complete set of lifting equipment manufacturing and electronic hook scale manufacturers.

The utility model relates to a connecting ring, in which a rotating ring body is pivoted at both ends of a connecting ring body, which is characterized in that: the body is a hollow positive cylinder, two rotating ring bodies form a convex large inlay part by one end of a line rod, the other end bends the ring ring ring, and then circles it on the straight section for positioning; the two rotating rings can be placed in the opening at both ends of the body by the convex large inlay part, and then roll to close the pivot Through the utility model, the opening at both ends of the body can obtain a horizontally balanced closing effect, so as to achieve a better rotation effect of improving the binding tensile strength and flexibility.

Butterfly card (Butterfly buckle) is a new type of construction equipment, which is an ideal tool for locking and anchoring formwork tie rod. The utility model uses the resistance produced when the wedge pin of the clamp is used to clamp the pull rod to anchor the pull rod, and the work is reliable. Compared with the traditional screw rod, it not only replaces the role of nuts and washers, but also changes the operation mode of the traditional template rod, effectively controls the size of the template, improves the flatness quality of the surface of the concrete components, and applies the flat button and butterfly button. The pull rod does not need to be processed, saves the cost of thread processing, and the material of the pull rod is optional. As long as the steel rod and the threaded steel bar can pass through the clamp It can be equipped with (generally 10-12mm pull rod), and the length of pull rod is not limited, as long as it is long enough. The construction operation is very convenient, fast, labor saving more than 50% compared with the screw rod, and can be used repeatedly, with long service life and low maintenance cost