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Gross instruction of design 4316
The subject of this graduation project is to design the process of 2000 tons sewage pipe buried plant, which is based on the municipal building in-depth and accelerated urbanization process requirements. Compared to other materials using in underground sewage pipe, rigid PVC pipe was adopted as the optimum choice. Based on conditions of use, processing conditions and other factors to consider, standards for the pipe were developed in which the pipe stiffness rating 4KPa, nominal diameter 160mm, tube length is 5m, the length of deviation from-10mm ~ +20 mm, pipe wall thickness of 6mm.
The general contexts of this design are: from the introduction to the description of the formulation and molding methods, and then from the general process to the design and calculation of parameters in each extrusion components, and the decision of devices model. And finally by the material balance, energy balance, non-plant technology, economic accounting and plant layout, the contents of design were designed to fully perfect step by step.
In formula design, according to the requirements of the product performance and technological conditions rationally choose raw materials, the dosage and proportion of various raw materials was determined. A good recipe is to match the mixing equipment, extrusion equipment, mould, and produce a high performance and good quality of pipes, the comprehensive cost is low, and this product cost performance is high. This design PVC resin as raw materials, at the same time to join all kinds of additives such as, stabilizer, lubricant, filler to produce buried sewage pipes.
Generally, through the extrusion production of buried pipes, extrusion molding is one of the important forming methods of plastic molding processing. Extrusion molding polyvinyl chloride (PVC) products is the main way, the PVC mixed or aggregate, through continuous heating and shear form can flow uniform melt, under a certain pressure through forming dies, continuous products made with constant cross section. At the same time, compared to the advantages and disadvantages of single and double screw manufacturing the pipe, a final decision with double screw extruder production UPVC pipe was made. The buried sewage pipe of the main production equipment has carried on the equipment type selection and design, and the corresponding technical parameters were determined.
Have a good process can be more excellent performance and price more suitable products, a technological process in addition to need to equipment and process planning also consider reasonable plant layout, environmental protection and energy-saving lamps, in order to reduce costs, obtain cost-effective tubing. Total process flow, the reference related literature, to determine the total production process and raw material pretreatment process diagram, and to specify them. PVC pipe production process can be divided into three processes. The first process is molding compound preparation process, including the formulation (raw materials, auxiliary materials before processing, measurement, transportation), mixed (high speed and low speed), sieve (molding powder or granules. The second process for the extrusion forming process, this part I choose single screw base molding. The third part is finalizing the packaging process. Refer to plastic machinery design standards, refining process required for each step of the technical parameters and models.
Combined with the actual choice of production process and product production, it is also carried out on material and energy balance calculation. Working time was determined by the material balance, and the number of days, corresponding to the Numbers of the main equipment; The actual power consumption; Production process required to heat or cold quantity; For equipment type selection, decided to specification and provide a basis sets, production, etc; Based on the proposed material consumption quota, further computational consumption, consumption, provide necessary basic data required equipment. For the quantity of materials required for the design provides a powerful reference. This design USES the continuous production line, 300 days a year, eight hours a day, is divided into three shifts the production plan.