Injection molding machine has a molded exterior complex with metal inserts, the precise size or capacity of the dense texture of the plastic products, was widely used in national defense, machinery, automobile, building materials, packaging, transportation, agriculture, culture, education, health and daily life of people in various fields. In today's rapid development of the plastics industry, injection molding machine regardless of quantity or variety occupies an important position, accounted for its production of 20%--30% plastic molding equipment as a whole, so as to become the fastest-growing plastic machinery, producing the largest number of models.