I. Process flow of one-out-of-two PVC drainage pipe production line
Formula → high speed mixing → low speed cold mixing → conical twin-screw extrusion → vacuum sizing, spray cooling → traction → trademark printing → fixed length cutting → flaring or not flaring → inspection → packaging and storage
Second, the function of PVC equipment
(1) PVC pipe production line raw material mixing: PVC stabilizers, plasticizers, antioxidants and other auxiliary materials, according to the proportion, process successively added to the high-speed mixer, the material and mechanical friction to make the material warmed up to the set process temperature, and then by the cold mixing machine will be lowered to the material to 40-50ºC; so that 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 extruding volume and feeding volume can be matched to ensure stable extrusion of products. Due to the characteristics of conical screw, the charging section has a larger diameter, the heat transfer area and shear speed of the material is relatively large, which is conducive to the plasticization of the material, and the diameter of the screw in the metering section is small, which reduces the heat transfer area and the shear speed of the melt, so that the melt can 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 to achieve the purpose of exhausting and dewatering. Feeding device and screw drive device adopts frequency conversion speed control, can realize synchronous speed control.
(3) Extruding die head part of PVC pipe production line: After compaction, melting, mixing and homogenization of PVC, subsequent materials are pushed to the die head by the screw, and the extruding die head is the key component of pipe molding.
(4) PVC pipe production line vacuum shaping tank for a mold double cavity, for pipe shaping, cooling, vacuum shaping tank is equipped with vacuum system for shaping and cooling and water circulation system, stainless steel box, circulating water spray cooling, vacuum shaping tank is equipped with forward and backward moving device and left and right, high and low adjustment of manual device.
(5) PVC pipe production line traction machine is used to continuously and automatically lead the cooled and hardened pipes out from the machine head, frequency conversion speed control.
(6) PVC pipe production line cutting machine: controlled by the travel switch according to the required length, automatic cutting, and delayed turn over the shelf, the implementation of streamlined production, the cutting machine to set the length of the work switch signal as a command to complete the whole process of cutting, in the process of cutting and pipe running to maintain synchronization, the cutting process is driven by electric and pneumatic drive to complete the cutting process, the cutting machine is equipped with a dust-absorbing device, cutting the debris produced by the timely suction, and recycling. (6) PVC pipe production line
(7) PVC pipe production line turn over the material frame turn over the material action by the cylinder through the air control to achieve, turn over the material frame is set with a limit device, when the cutting saw cut off the pipe, the pipe continues to transport, after a delay, the cylinder into the work, to realize the turn over the material action, to achieve the purpose of unloading. After unloading after a delay of several seconds automatically reset, waiting for the next cycle.