Machinery tie protection chain installs on wheeled loader, carrier truck, ect, which use in wheeled project mechanical equipment protection chain make the wheel for longer service life, feduced thd maintenance work, depress the charge of project operating increase the work efficiency work depress the charge of project operating increase the work efficiency at present the protection chain widely using in the rockselection factory, tunnel work department and the road building project. The protection chain adapts to different kinds of bad ground