Understand the causes of wear of screw vacuum pump and reduce wear

 

The screw vacuum pump must be installed in a position with ventilation and keep the pump body at a certain level to ensure smooth operation and low vibration of the vacuum pump; The exhaust nozzle of the screw vacuum pump is connected to the outdoor with a leather pipe to avoid oil vapor polluting the environment and reduce pollution. So how much do you know about the causes of screw vacuum pump wear? Here are some reasons for the wear of screw vacuum pump, including the following aspects: The operation of screw vacuum pump is relatively stable in the actual use process, but some users react that serious wear occurs when the vacuum pump runs for a long time, and serious wear affects the production and use effect of vacuum pump. At this time, we should understand the causes of wear, and then reduce wear as much as possible. 《1》 Because the material is not plasticized uniformly, or metal foreign matters are mixed in the speculation, the rolling torque of the screw of the screw vacuum pump is suddenly added, which exceeds the strength bearing capacity of the screw, resulting in wear. 《2》 When granular plastics enter the barrel from the hopper, they will first reach the feed section. Dry friction is inevitable in the feeding part. When these plastics lack heat and melt unevenly, it is easy to form the inner wall of the screw vacuum pump barrel and the external wear of the screw increases. 《3》 If there are fillers such as calcium carbonate and glass fiber, the wear of screw and barrel can be accelerated. 《4》 In the shrinkage and homogenization part, if the melting state of the plastic is disordered and uneven, the wear will increase. 《5》 Because some plastics are reinforced, such as glass fiber, minerals or other fillers. Compared with molten plastics, these substances have greater friction against metal materials. 《6》 The screw of screw vacuum pump rolls in the barrel, and the conflict between materials and barrel leads to the gradual wear of the working appearance of screw and barrel. The diameter of the screw decreases gradually and the diameter of the inner hole of the cylinder increases gradually. In this way, with the gradual wear of the screw and barrel, the diameter gap between the screw and barrel gradually increases. 《7》 If high-speed conversion is used to increase the shear force of plastic during injection molding, it will also produce corresponding tear fibers in the reinforcement. The torn fiber contains sharp ends, which will greatly increase the wear force. 《8》 When inorganic minerals slide at high speed on the metal surface, their scraping effect is not small. So the speed should not be too high. 《9》 Since the resistance of the head and deflector in front of the barrel does not change, the leakage flow of extruded material is increased, that is, the material flow increases from the diameter gap to the feed direction.

2X-A Two Stage Rotary Vane Piston Pump used in District Cooling