PVC electrical casing production line process
Formulation → High-speed mixing → Low-speed cold mix → Conical twin-screw extrusion → Vacuum sizing, spray cooling → Traction → Label printing → Fixed-length cutting → Flaring or non-flaring → Inspection → Packaging warehousing
(1) Mixing raw materials for PVC pipe production line: Add PVC stabilizers, plasticizers, antioxidants, and other auxiliary materials to the high-speed mixer in order of proportion and process, and raise the temperature of the materials to the set process temperature by friction between the materials and the machine. , Then the material is reduced to 40-50oC by cold mixer; this can be added to the hopper of the extruder.
(2) Extruder part of PVC pipe production line: This machine is equipped with a quantitative feeding device, so that the extrusion amount and the amount of material can be matched to ensure stable extrusion of the product. Due to the characteristics of the conical screw, the feed section has a larger diameter, and the heat transfer area and shear speed of the material are relatively large, which is beneficial to the plasticization of the material, the diameter of the screw in the metering section is small, and the heat transfer area and the melt are reduced. The shear rate allows the melt to extrude at a lower temperature. When the screw rotates in the barrel, the PVC mixture is plasticized and pushed toward the head to achieve homogenization of compaction, melting, and mixing; and the purpose of exhausting and dehydrating is achieved. Feeding device and screw drive device adopt frequency conversion speed regulation, which can realize synchronous speed regulation
(3) Extrusion die part of PVC pipe production line: After compaction, melting, mixing and homogenizing of PVC, there is a follow-up material pushed to the die head through the screw, and the extrusion die is a built-up part of the pipe forming.
(4) PVC pipe production line vacuum water tank is a mold double chamber, used for pipe setting and cooling. Vacuum styling water tank is equipped with vacuum system and water circulation system for setting and cooling, stainless steel box, circulating water spray cooling, vacuum Stereotype tanks are equipped with front and rear mobile devices and left and right, height adjustment manual devices.
(5) Hauling Off machine is used to continuously and automatically pull out the cooled and hardened pipe material from the nose, with frequency conversion and speed regulation.
(6)Cutting machine: After the distance switch is controlled according to the required length, automatic cutting is performed, and the flow is delayed and the flow is produced. The cutting machine uses the fixed-length switching signal as the command to complete the cutting process and the cutting process. The synchronization between the medium and the tubing is maintained. The cutting process is completed by electric and pneumatic drives. The cutting machine is equipped with a dust collection device to suck out the debris generated by the cutting in time and recover it.
(7) The Automatic stacker turning action is achieved by pneumatic control through the air cylinder. The overturning frame is provided with a limiting device. After the cutting saw cuts the pipe, the pipe continues to be transported. After the delay, the cylinder enters into operation. Turn over the material to achieve the purpose of unloading. After unloading, it will automatically reset after a delay of several seconds, waiting for the next cycle.