What hinge is used to connect a layer in the middle of the seismic support?

Add a layer in the middle of the anti-seismic bracket and connect it with anti-seismic hinges. The anti-seismic bracket can be put into the annular groove through the annular column with an anti-seismic hinge, so that the installation holes two of the connecting block one and the connecting block two are always coaxial, without the need for constant fixing, and it is very safe. Seismic supports are various components or devices that limit the displacement of auxiliary electromechanical engineering facilities, control the vibration of facilities, and transfer loads to the load-bearing structure.