The plug gasket is a common form of static seal used in various fluid equipment of thermal power generation equipment, and leakage is a common failure mode of production equipment. With the high parameters and large-scale of thermal power generation, modern thermal power generation equipment must achieve higher and higher requirements for the performance of seals in order to achieve "safe, stable, long-term, full-load, and optimized production." The gasket is sealed with three types of non-metallic gaskets, non-metallic and metal combination gaskets and metal gaskets. Generally, non-metallic gaskets are selected at normal temperature and low pressure. When there is a certain pressure and high temperature, metal gaskets or non-metal and metal combination gaskets are generally selected. The metal toothed gasket is made of metal, which uses a high stress in the tip of the tooth to form a metal wire seal. It is safe and reliable, and can achieve a high structure of the 3-valve spool. The matching size is determined according to the principle diagram, the requirements of 1, 2, integrated into the end cover of the cleaning pump, and the cleaning pump can realize the purpose of automatic unloading and automatic recovery cleaning. 4 Note The spool must be installed horizontally. Minimize the quality of the entire spool to reduce the impact of the spool movement. Sealing effect. However, in order to produce good quality metal toothed gaskets, the selection, structure and processing are very important. 2 Material selection and structure Because the working environment of thermal power generation equipment is high pressure and high temperature state, the toothed pad is required to have certain elastic or plastic deformation performance, and the hardness difference between the flange and the gasket is preferably less than 40HB. For this purpose, materials such as 1013 or lCrl8Ni9Ti should be used. Its structure is as shown. In order to better ensure the wire seal, it is required that the upper and lower planes have a degree of Ka<3.2 and a parallelism of 0.02 mm. In order to ensure that the sharp corners are not bumped, a certain width is required. In recent years, with the continuous development of sealing technology, the material and structure of the gasket have also been greatly improved. The traditional asbestos sealing materials have gradually adjusted the proportion of each diameter of the spool to achieve the purpose of closing. 5 Conclusion The cleaning machine with automatic unloading valve has excellent performance, flexible and reliable action, and greatly facilitates the cleaning work. Save energy. The structure is simple and easy to manufacture. (Edit Yongping) is replaced by expanded graphite material. For this reason, on the basis of the toothed gasket, graphite can be attached to the upper and lower contact faces to form a composite toothed pad, as shown. The corrugated skeleton of the overall structure retains the original reliability of the toothed pad, and the sharp teeth on the same shape can maintain the multi-line sealing like the toothed pad, and the double sealing effect of the expanded graphite material increases the tooth. The elasticity of the pad is good in power plant use. The skeleton can be made of low carbon steel or stainless steel according to different working environments, and its hardness should be less than the flange hardness. 3 tooth-shaped pad processing technology and tooling Because the tooth-shaped gasket structure is special, it is easy to be deformed during processing. If the process and tooling characteristics are not studied, the design requirements and product quality will be difficult to guarantee. The main problems of the processing technology and tooling are as follows: 3.1 Process After the whole material is cut, the center hole of the drill is drilled. As shown, the blank to be processed is put on the mandrel, and the outer circle is clamped with a nut. Then, it is mounted on the outer tooling 1 shown, and is clamped with a gasket and a tip. After the tooth is formed, the inner hole is finished. Corresponding turning tooth tools require grinding of the forming knives. The pad can be used to make the DpD. Then the car is removed from the excess to ensure that the plane of the blank is not deformed. The toothed pad coat tooling is the second process of completing the toothed pad processing as shown. With a car. The outer diameter of the machining groove and the toothed pad are matched by a small gap, and the s7 level is adopted. It is convenient to install and disassemble the small gap, and the gasket is not shaken in the groove to ensure the processing of the tooth portion. The groove depth should be such that the cutting of the outermost teeth is appropriate. The thickness of C depends on the material in the case of ensuring rigidity. B is a clamping process column. For example, a small-sized pad can be made of the same material as C; for example, a larger-sized pad can be used to weld three process blocks at a distance of 120° on the back side of C. This method can save materials and reduce costs. The metal toothed gasket designed and processed by the above method, the tooling mandrel is the tooling for completing the first process, as shown, a is the clamping process column for the shoulder and the nut to jointly clamp the toothed pad. Conducive to processing, in order to ensure that the plane of the blank is not deformed, it should be padded. If the thicker pad is processed, the outer diameter of the pad can be made thinner. 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