Synchronization mechanism and folding hinge

A folding hinge, comprising two door plates, two housing connecting rods and a synchronization mechanism, wherein the synchronization mechanism comprises:

• a base, wherein the base comprises a spindle seat and a stop rack, wherein two first rotation portions are respectively provided on two sides of the spindle seat along a width direction;
• the stop rack is detachably connected to the spindle seat, and two second rotation portions are respectively provided on two sides of the stop rack along the width direction, wherein one of the stop rack or the spindle seat is provided with an overlapping groove, the other one of the stop rack or the spindle seat is provided with an inserting protrusion, and the inserting protrusion is inserted into the overlapping groove;
• two swing arms, wherein the two swing arms are rotatably disposed on the two first rotation portions respectively;
• two slide rail arms, wherein the two slide rail arms are synchronously and rotatably disposed on the two second rotation portions respectively, and each of the two slide rail arms is provided with a slide groove;
• and
• two connecting rod shafts, wherein each of the two connecting rod shafts comprises a first end and a second end, the first end of each of the two connecting rod shafts is connected to a respective one of the two swing arms, the second end of each of the two connecting rod shafts is in a sliding fit with the slide groove of a respective one of the two slide rail arms, and the two slide rail arms are configured to rotate to respectively drive the two swing arms;
• and
• wherein the two housing connecting rods are located on two sides of the base along the width direction respectively, are in a sliding fit with the two slide rail arms respectively and are hinged with the two swing arms respectively, and the two door plates are located on the two sides of the base along the width direction respectively, are in a rotation fit with the two housing connecting rods respectively and are in a rotation fit with the two connecting rod shafts respectively.