设计最后车间布置的内容，简单介绍了车间布置的要求与原则。结合设备选型以及生产工艺流程对车间进行布置，对此次设计的具体车间编排作了简要说明。其结果以车间布置平面图的形式呈现。

Design general description

The subject of this graduation project is an annual output of 250 thousand polyethylene blow molding workshop, process design。 Specifications for the outer diameter of 320mm, high 410mm, wall thickness of 5mm, capacity of 30L。

The general context of this design is: from the introduction to the formula and forming method of description, from the total process to the design and calculation of extrusion equipment components to determine the parameters, equipment selection, and finally by the material and energy balance to non workshop process, economic accounting and workshop layout, each design content fully。

In the introduction, mainly introduced the application type of blow bucket, and from the performance, use and economic point of view of several commonly used blow molding barrels were compared, and ultimately determine the HDPE as the design of the use of materials。 At the same time, the purpose and significance of the design and the design specifications are defined in this chapter, and the problems in the design are also considered。

In the formulation design, firstly, the function of each component in the formula was expounded, and the common raw material of each component was introduced。 According to the characteristics of HDPE, combined with physical and mechanical properties and other standards, a good formula design is carried out。 In the selection of components, in addition to meeting the physical and chemical properties of HDPE, factors such as the interaction of ingredients in the formula, the availability of raw materials and the reasonableness of the price are considered。 Determine the number of shares between components。 Finally, the list of recipe designs is given in the form of lists。

In the chapter of forming method selection, the forming methods of HDPE are introduced。 A comparison is made between die extrusion and extrusion blow molding, and the extrusion blow molding is considered as the molding method of the design。 In the second section of this chapter, the working principle and characteristics of extrusion blow molding are emphasized。

In the chapter of the production process。 First of all, the overall process of the design is determined, the necessary description of the production process is given, and the flow chart of the production process is given。 Secondly, according to the order of production process, each production process is introduced and designed in turn。 It mainly includes the preparation process of the molding material, the extrusion blow molding process and so on。 It should be said that the extrusion blow molding process is the key section of this chapter, this section in detail the production equipment and technology, but also to use the parameters of screw extrusion blow molding and die and the detailed selection and design, to meet the design requirements。 Finally, according to the selection of screw and die parameters, the best working point is obtained, which provides the basis for selection of equipment and material balance。

In the chapter of equipment selection, combining the design process and the best working point, the appropriate equipment is selected for each process, and the related parameters of each device, such as model, power and size, are given。 This parameter can provide a powerful basis for energy balance, economic calculation and workshop layout。

In the chapter of material balance, the material balance is calculated on the basis of the law of conservation of mass。 First of all, determine the calculation of material balance, including the number of days of production, production time and the loss rate of each link。 Secondly, after the process flow diagram is given, the consumption of raw materials, the output of the product, the consumption and composition of each stage in the process of production can be calculated。 Finally, a comprehensive table of material consumption is given, which can be used for economic accounting。