Expansion bolts/ground mount solar installation/solar panel hardware/residential solar power florida
Mar 21, 2017
Expansion bolts are special thread connections for fixing the pipe support / suspension / bracket or equipment to the wall, on the floor, on the column.
The level of the expansion bolts is divided into 45, 50, 60, 70, 80;
The material is mainly divided into austenite A1, A2, A4;
Martensite and ferrite C1, C2, C4;
Its representation method such as A2-70;
"-" before and after that, respectively, said the bolt material and strength level.
(1) Bolt material Common materials: Q215, Q235, 25 and 45 steel, for important or special use of threaded joints, can choose 15Cr, 20Cr, 40Cr, 15MnVB, 30CrMrSi and other mechanical properties of high alloy steel.
(2) Allowable stress and load characteristics of the allowable stress thread joint (static and variable load), whether the connection is tightened, whether the preload force is required and the material of the threaded joint, the size of the structure.
Expansion of the expansion of the screw principle: the expansion of the screw is fixed using the pull out of the slope to promote the friction caused by friction, to achieve a fixed effect. The screw is a thread, one has a vertebral degree. Outside the package of a steel skin, half of the metal cylinder has a number of incision, put them together into the wall of the hole, and then lock the nut, the nut pull out the screw, the vertebral pull into the steel cylinder, steel round Tube is opened, so tightly fixed on the wall, generally used for fence, rain Peng, air conditioning and other cement, brick and other materials on the fastening. But its fixation is not very reliable, if the load has a greater vibration, may be loose, it is not recommended for the installation of ceiling fans and so on.
Expansion of the bolt is the principle of the expansion bolts hit the hole in the ground or wall, with a wrench to tighten the bolts on the expansion bolts, bolts to go out, while the outside of the metal sleeve is not moving, so the bolt under the bulk of the put Metal sets up to make it full of holes, this time, the expansion bolts on the pumping out.
