Arch grid bolted sphere node rotating and fixing device and arch grid mounting system

An arch grid bolted sphere node rotating and fixing device, comprising a base, a fixing part, and a rotating part, wherein

• the fixing part comprises a groove body, a first vertical plate, and a second vertical plate;
• the groove body, the first vertical plate, and the second vertical plate are respectively connected to the base;
• a notch of the groove body is obliquely upward;
• the first vertical plate and the second vertical plate are respectively located on opposite sides of the groove body;
• the first vertical plate is provided with a first through hole;
• the second vertical plate is provided with a second through hole;
• the first through hole and the second through hole are formed oppositely;
• the rotating part comprises a first rod piece, a rotating sphere, and a second rod piece that are fixedly connected in sequence;
• the rotating sphere is placed in the groove body;
• the first rod piece is rotatably connected to the first through hole;
• and the second rod piece is rotatably connected to the second through hole;
• wherein the groove body comprises side cross rib plates and a bottom cross rib plate;
• the side cross rib plates and the bottom cross rib plate are respectively connected to the base;
• and the side cross rib plates and the bottom cross rib plate are spliced in sequence along a plane perpendicular to the first rod piece and the second rod piece, and are used for forming a groove matched with a spherical surface of the rotating sphere.