Production process Raw material + auxiliary preparation → mixing → conveying and feeding → forced feeding → conical twin-screw extruder → extrusion die → sizing sleeve → spray vacuum setting box → immersion cooling water tank → ink printing machine → crawler traction Machine → Lifting Knife Cutting Machine → Pipe Stacking Rack → Finished Product Inspection and Packaging.
(1) Mixing of raw materials: PVC stabilizers, plasticizers, antioxidants and other auxiliary materials are added to the high-speed mixer according to the proportion and process, and the materials are heated to the set process temperature through self-friction with the machine. The cold mixer reduces the material to 40-50 degrees; this allows it to be fed into the hopper of the extruder.
(2) Extruder part: This machine is equipped with a quantitative feeding device, so that the extrusion amount and the feeding amount can be matched to ensure the stable extrusion of the product. Due to the characteristics of the conical screw, the feeding section has a larger diameter, and the heat transfer area and shear speed of the material are relatively large, which is conducive to the plasticization of the material. The high shear rate enables the melt to be extruded at a lower temperature. When the screw rotates in the barrel, the PVC mixture is plasticized and pushed to the head, so as to achieve compaction, melting, mixing and homogenization; and achieve the purpose of exhausting and dehydrating. The feeding device and screw drive device adopt frequency conversion speed regulation, which can realize synchronous speed regulation.
(3) Extrusion die part: After compacted, melted, kneaded and homogenized PVC, the follow-up material is pushed to the die by the screw, and the extrusion die is the key component of pipe forming.
(4) The vacuum setting water tank is used for the setting and cooling of pipes. The vacuum setting water tank is equipped with a vacuum system and a water circulation system for setting and cooling, a stainless steel box, and circulating water is sprayed for cooling. , Height adjustment manual device.
(5) The tractor is used to continuously and automatically lead out the cooled and hardened pipes from the machine head, and the speed is controlled by frequency conversion.
(6) Cutting machine: After the travel switch is controlled according to the required length, automatic cutting is performed, and the rack is turned over with a delay to implement flow production. The cutting machine takes the fixed-length switch signal as the command to complete the entire cutting process. The operation is kept synchronous, and the cutting process is completed by electric and pneumatic drives. The cutting machine is equipped with a vacuum device to suck out the debris generated by cutting in time and recover it.
(7) The turning action of the turning frame is realized by the air cylinder through the control of the air circuit. The turning frame is equipped with a limit device. After the cutting saw cuts the pipe, the pipe continues to be conveyed. After a delay, the air cylinder starts to work to realize the turning of the material. action to achieve the purpose of unloading. After unloading, it will automatically reset after a delay of several seconds, waiting for the next cycle