Preparation process and device of polyamide

Abstract

The invention relates to the technical field of polyamide preparation, and discloses a preparation device of polyamide. The device comprises an injection molding machine, a screw rod and a drill bit,wherein the screw rod and the drill bit form a transmission device to extrude a polyamide liquid, a sleeve is arranged on the outer wall of the injection molding machine in a sleeve mode, a copper pipe is arranged in the sleeve, a threaded pipe is arranged in the copper pipe, the end part of the threaded pipe is connected with a supporting block, and an expansion body is arranged in the threaded pipe. The expansion body is automatically expanded according to the temperature of the injection molding machine, so that a cooling tube is opened, a cooling liquid is injected into the sleeve, the temperature of the injection molding machine is reduced, so that in the using process of the injection molding machine, the injection molding machine can be kept at a normal temperature all the time, theinjection molding machine can keep a good state in the injection molding process, the service life of a hydraulic element and an air cylinder in the injection molding machine is prolonged at the sametime, the abrasion degree of the drill bit and the injection molding machine can be reduced when the temperature of the injection molding machine is normal, so that the injection molding machine is always in a sealed state in the use process, the service life of the injection molding machine is prolonged, and the injection molding effect of the injection molding machine is improved.

Description

technical field [0001] The invention relates to the technical field of polyamide preparation, in particular to a polyamide preparation process and device. Background technique [0002] Nylon gaskets are widely used in various industrial fields due to their excellent insulation properties, non-magnetic properties, heat insulation, and light weight. Plastic gaskets of individual materials also have high temperature resistance, high strength, and corrosion resistance. Some products have anti-drop functions. Gaskets are mainly made by injection molding machine. The main function of the injection molding machine is to inject the melted material into the mold through the pipeline of the injection molding machine, and finally form the specified material body. [0003] The working principle of the existing injection molding machine is as follows: Figure 5 As shown, the melted material enters the injection molding machine through the hopper, and then the motor drives the threaded ro...

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Problems solved by technology

[0003] The working principle of the existing injection molding machine is as follows: Figure 5 As shown, the melted material enters the injection molding machine through the hopper, and then the motor drives the threaded rod to rotate, thereby driving the drill bit to push the material into the mold. During the injection process, the screw and the inner wall of the injection molding machine rotate to generate frictional heat and melt at the same time. The heat of the final material also accumulates inside the injection molding machine, resulting in local deformation of the machine. The moving parts with different thermal expansion coefficients in the hydraulic components are stuck due to the smaller fit clearance, causing malfunctions and affecting the transmission accuracy of the hydraulic system. The quality of the work will deteriorate, and the high temperature rise of the injection molding machine will reduce the viscosity of the oil, deform the rubber seals, accelerate aging and failure, reduce the sealing performance and service life, increase the leakage, and significantly reduce the volumetric efficiency of the pump and the efficiency of the entire system , when the viscosity of the oil decreases, the oil film of the sliding valve and other moving parts becomes thinner and cut, and the frictional resistance increases, resulting in increased wear, resulting in leakage of the drill bit and the injection molding machine, and excessive temperature rise will accelerate the oxidation and deterioration of the oil. Precipitation of asphalt substances reduces the service life of the hydraulic oil, and the precipitates block the damping holes and slit valve ports, causing the pressure valve to be stuck and unable to move, and the metal pipeline is elongated and bent, or even ruptured

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