The protective cover is divided into steel shield and organ type protective cover (nylon cloth +PVC board support) and rubber protective cover. The steel plate and stainless steel protective cover has the features of good sealing, iron proof, liquid coolant protection, accident prevention, durable and beautiful appearance. The organ type protective cover adopts German advanced technology, external use of German nylon cloth and PVC plate support. It can withstand oil, corrosion resistance, hard collision and non deformation, long life, good seal, smooth walking, durable and so on.. it can be designed into various shapes according to needs, such as U type, typeface, square, 7 character. A round shape, such as a circle.