The drive system of the extruder is usually composed of a prime mover (such as an electric motor, etc.), a speed control device, a deceleration device, etc. Of course, the three are not completely separated.
Some prime movers can adjust the speed by themselves, and some combine the speed control device and the speed reduction device of the transmission system of the PVC fiber hose production line (such as the use of shifting gear reduction boxes, etc.).
When arranging, it should be decided from whether the working environment of the extruder is good, whether the installation, maintenance and operation are convenient and safe. As for the reducer of the extruder, it can be divided into three types: horizontal type, vertical type and mixed type.
The vertical reduction box has a compact and beautiful structure, but the manufacturing process and assembly of the transmission system of the PVC fiber hose production line are difficult, and the lubrication of the large gear is poor, and an oil pump is generally required for forced lubrication.
The manufacturing process and assembly of the horizontal reducer are relatively easy, but the structure is not compact enough, and the dimensions in the axial and width directions are large. In addition to the above-mentioned forms, there are also hybrid gearboxes with integrated vertical and horizontal features that are arranged obliquely in space.
In this way, the space can be used reasonably, the structure is more compact, and the lubrication of the large gear is also better. At present, large-scale extruders in China use this form.
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, which has a larger heat transfer area and shear speed of the material, which is beneficial to the plasticization of the material.
The small diameter of the screw in the metering section reduces the heat transfer area and the shear rate of the melt, so that the melt can be extruded at a lower temperature. When the screw rotates in the barrel, the PVC fiber hose mixture is plasticized and pushed to the machine head.
So as to achieve the purpose of compaction, melting, mixing and homogenization, exhausting and dehydration. The feeding device and screw drive device adopt frequency conversion speed regulation to realize synchronous speed regulation.
The PVC material that has been compacted, melted, kneaded and homogenized in the extrusion die is pushed to the die by the screw for extrusion. The die is a key component in the forming of fiber reinforced hoses.
The vacuum shaping water tank is used for shaping and cooling of pipes. The vacuum shaping water tank is equipped with a vacuum system for shaping and cooling, a water circulation system, and a stainless steel box for spray cooling.
The tractor is used to continuously and automatically lead the cooled and hardened PVC fiber hose from the machine head to frequency control.