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March 03, 2021

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What are the composition of the plastic injection molding

October 14, 2020

Although the structure of the mold may vary widely due to the variety and performance of plastics, the shape and structure of plastic products, and the type of injection machine, the basic structure is the same. The mold is mainly composed of pouring system, temperature control system, molding parts and structural parts. Among them, the pouring system and the molded parts are the parts that directly touch the plastic, and change with the plastic and the product. They are the most messy and the largest changes in the plastic mold, and require the highest processing finish and precision. The plastic injection molding is composed of a movable mold and a fixed mold. The movable mold is installed on the movable template of the plastic injection molding machine, and the fixed mold is installed on the fixed template of the plastic injection molding machine. During plastic injection molding, the movable mold and the fixed mold are closed to form a pouring system and cavity. When the ...

What are the types of elbow pipe fitting

November 29, 2020

What is elbow pipe fitting The elbow is used to change the direction of the pipe. The bending angles of commonly used elbow pipe fitting are 90°, 45° and 180°. The 180° elbow is also called U-shaped elbow. There are also special angle elbow pipe fitting , but there are very few elbow pipe fitting. The types of elbow pipe fitting are as follows: 1. Malleable steel elbow Malleable iron elbow, also known as malleable cast iron elbow, is the most common threaded elbow. The specifications of malleable steel elbow pipe fitting are relatively small, and the commonly used specifications range from 1/2 to 4 inches. According to their different surface treatments, they are divided into galvanized and non-galvanized. This kind of malleable steel pipe fittings are mainly used for heating, water pipes and gas pipes. In the process, except for the low-pressure pipeline that needs to be frequently disassembled, other material pipelines are rarely used. 2. Pressed elbow Pressed elbow pipe fitting, als...

What factors will affect the service life of mechanical seals?

March 07, 2021

What factors will affect the service life of mechanical seals ? The main corrosive substance in the desulfurization circulating pump is chloride ions. Due to the strong reducibility of chloride ions, it has corrosive effect on the medium of the mechanical seal material, causing surface corrosion of the mechanical seal. The sealing material medium is limestone and gypsum slurry, the solid content (mass percentage) is about 35%; the temperature is controlled within 70℃; the pressure is less than 0.8MPA; the pH value is between 4-8; the chloride ion content is less than 0.04%. Among them, chloride ions can penetrate mechanical seals when they are severely corroded. What is more serious is that dissimilar metals work together in the medium, causing electrochemical corrosion. This leads to inadequate fixing of the ring. If the sealing surface is in friction for a long time, or the cooling water supply is quickly stopped, or impurities enter the sealing surface, it will initially cause smal...