(1). The tractor is used to continuously and automatically lead the cooled and hardened pipe from the head of PVC pipe extrusion line for the frequency conversion speed regulation.
(2). Extrusion die head: PVC after compaction, melting, mixing and homogenization, and subsequent materials are pushed to the die head through the screw. The extrusion die head of the pipe extrusion line from plastic extrusion china is the key component of pipe forming.
(3). The vacuum shaping water tank is used for the shaping and cooling of pipes. The vacuum shaping water tank is equipped with a vacuum system and water circulation system for shaping and cooling, a stainless steel box and circulating water spray cooling. The vacuum shaping water tank is equipped with a front and rear moving device and a manual device for left, right and high-low adjustment.
(4). The turnover action of the turnover rack is realized by the air cylinder through the air circuit control. The turnover of the extrusion production line is equipped with a limit device. When the cutting saw cuts the pipe, the pipe continues to be transported. After the delay, the air cylinder begins the work to realize the turnover action and achieve the purpose of unloading. After unloading, it will automatically reset after a delay of several seconds and wait for the next cycle.
(5). Raw material mixing: PVC stabilizer, plasticizer, antioxidant and other auxiliary materials are successively added into the high-speed mixer according to the proportion and process. The materials are heated to the set process temperature through the self friction between the materials and machinery, and then the materials are reduced to 40-50°C through the cold mixer; In this way, it can be added to the hopper of PVC pipe extrusion line.
(6). Cutting machine: after being controlled by the travel switch according to the required length, it will automatically cut and delay the frame turnover to implement flow production. The cutting machine will complete the whole cutting process with the travel switch signal as the command.
The cutting process is synchronized with the pipe operation. The cutting process of PVC pipe extrusion line is completed by electric and pneumatic drive just like PS Sheet Extrusion Line. The cutting machine is equipped with dust suction device to suck out and recycle the debris produced by cutting in time.
Due to the characteristics of conical screw, the feeding section has a large diameter, which has a large heat transfer area and shear speed, and is conducive to the plasticization of materials. The screw diameter in the metering section is small, which reduces the heat transfer area and the shear speed of melt, so that in pvc sheet extrusion line the melt can be extruded at a lower temperature.
When the screw rotates in the cylinder, the PVC mixture is plasticized and pushed to the head, so as to achieve compaction, melting, mixing and homogenization; The feeding device and screw drive device for exhaust and dehydration adopts frequency conversion speed regulation, which can realize the synchronous speed regulation of PVC pipe extrusion line.