Screw pump is a positive displacement pump, which relies on the volume change of the sealed chamber formed by the screw and the bushing to suck and discharge the liquid. Screw pump is characterized by steady flow, small pressure pulsation, self-priming capability, low noise, high efficiency, long life, reliable work; in use, the screw pump will have losses, and now to say the reasons for the wear and tear of the screw and Screw pump common fault and solution. Screw pump First, the screw pump often encounter fault handling methods 1. Pump violent vibration or noise causes: pump installation is not strong or the pump is installed too high; motor ball bearings damaged; pump spindle bending or spindle with the motor is not heart, not parallel Wait. Treatment: install a steady pump or reduce the installation height of the pump; replace the motor ball bearings; correct the bending of the pump shaft or adjust the relative position of the pump and the motor. 2. Drive shaft or motor bearing overheating causes: the lack of lubricant or bearing rupture. Approach: add oil or replace the bearing. 3. The pump does not produce water causes: pump body and suction pipe did not fill the diversion; moving water level lower than the pump drainage pipe; suction pipe rupture. Approach: The sealing surface between the screw and the housing is a curved surface. There are unsealed areas such as ab or de on this surface and a number of triangular notches abc, def with the groove portion of the screw. The notches of these triangles form a passage for the liquid, allowing the drive screw groove A to communicate with the grooves B, C in the driven screw. The grooves B, C, along with their spiral around the back, respectively, and the back of the grooves D, E communicated. Since there are also triangular notches a'b'c 'similar to the front face on the sealing surfaces where the grooves D, E engage with the groove F (which belongs to the other thread), D, F, E will also communicate. In this way, the groove ABCDEA also form a "∞" -shaped sealing space (such as the use of single-head thread, the groove will be along the axial disk Rao screw, the suction port through, can not form a seal). Not hard to imagine, in such a screw, will form a number of independent "∞" -shaped sealed space, each sealed space occupies the axial length exactly equal to the lead of the tired rod t. Therefore, in order to make the suction and discharge of the screw, the length of the screw thread should be longer than one lead. Second, the screw wear five reasons 1. Each plastic, have an ideal plastics processing temperature range, barrel temperature should be controlled to make it close to this temperature range. Granular plastic into the barrel from the hopper, will first reach the feeding section, the feeding section will inevitably appear dry friction, when these plastics lack of heating, uneven melting, it is likely to cause the cylinder wall and screw surface wear increased. Similarly, in the compression section and the homogenization section, if the molten state of the plastic is disturbed, the abrasion will also be accelerated. 2. Speed ​​should be properly adjusted. As part of the plastic with toughening agents, such as fiberglass, minerals or other fillers. The friction of these materials on metallic materials is often much greater than that of molten plastic. Injection of these plastics at high rotational speeds will increase the shearing force on the plastic and at the same time will result in more shredded fibers correspondingly to the reinforcement. The shredded fibers will have sharp ends that will cause wear The power is greatly increased. Inorganic minerals in high-speed sliding metal surface, the scraping effect is not small. Therefore, the speed should not be adjusted too high. 3. Screw rotating in the barrel, the friction between the material and the two, so that the working surface of the screw and the barrel gradually wear: screw diameter gradually reduced, the inner diameter of the cylinder gradually increased. In this way, screw and barrel with the diameter of the gap, with the gradual wear and tear of both a little bit larger. However, since the resistance of the nose and manifold in front of the barrel is unchanged, this increases the amount of leakage when the material being extruded advances, i.e., the amount of material flowing from the diameter gap to the feed. As a result, plastic machinery production is reduced. This phenomenon in turn makes the material in the barrel residence time increases, resulting in material decomposition. In the case of polyethylene, the hydrogen chloride gas produced by decomposition enhances the corrosion of the screw and barrel. 4. Materials such as calcium carbonate and glass fiber filler, can speed up the screw and barrel wear. 5. As the material is not plasticizing evenly, or metal foreign materials mixed into the material, the screw torque torque suddenly increased, the torque beyond the limit of the screw strength, the screw twist. This is an unconventional accidental damage. Further Reading: pump valve pipe fittings Exhibition Water Expo Xiamen exhibition of marine equipment Internet + Forum Yiwu Fair 2016 exhibition mold top ten brands of the Internet information industry (Xiamen) Technology Co., Ltd. Author: Asian pumps Network Editor: Yao Xiaoxia (QQ / WeChat:) http://beng.liuti.cn/ (Service Hotline:)
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