Pharma cold chain HS code analysis

Engine piston (key part of the engine - piston) The Pharma cold chain HS code analysispiston is one of the key components in the engine. Its function is to convert chemical energy into mechanical energy, promote the substance in the cylinder, and generate power. Among them, the structure and performance of the piston have a great impact on the performance, efficacy and durability of the engine.Therefore, the piston has been extensively studied and continuously improved. 1. The structure and working principle of the piston. The piston is usually a cuboid or cylindrical metal piece. There is a conical surface with a complex shape between the bottom and the dome, and a pin connected to the crankshaft at the bottom. In fact, there are also certain gaps or gaps between the piston and the cylinder, and the piston ring is kept sealed. The working principle of the piston is mainly reflected in two aspects: the first is to promote the work of the cylinder. When the fuel mixture burns, the gas generates a certain pressure, pushing the piston down. When the volume in the cylinder becomes larger, oxygen enters the cylinder, and then the exhaust gas that does not need to be burned is discharged through the valve. Secondly, the piston maintains a strong and stable power transfer under the assistance of the oil pan. It enables the crankshaft to rotate and converts it into traction.This power shift from the piston to the crankshaft to the tire enables the car to drive. Two. The classification and development process of pistons can be divided into different types according to different classification standards. For example, according to the ratio of diameter and length, pistons can be divided into two types: short-shoulder pistons and long-shoulder pistons. Among them, the length of the short-shoulder piston is relatively short, the shoulder is relatively short, the center balance is good, and the transmission efficiency is high. In addition, according to different materials, pistons can also be divided into cast pistons, forged pistons, composite pistons, etc. Among them, casting pistons have certain advantages in terms of weight and cost, but their durability, strength and wear resistance are relatively poor. Forged pistons and composite pistons have higher strength and wear resistance. In the development process of the piston, with the continuous development and progress of the automobile industry, the piston is also constantly updating and iterating to meet the increasing requirements and needs.At present, the main direction of pistons is to improve manufacturing accuracy, strength, lightness and durability to achieve better performance and higher efficiency. 3. The design and manufacture of pistons. The design and manufacture of pistons usually refer to various different requirements and standards. For example, the piston needs to have certain properties such as lightness, strength, wear resistance, heat resistance and sealing. Therefore, when designing, the following points need to be paid attention to: first of all, good airtightness, and the sealing performance between the cylinder, the piston ring and the piston must be ensured to avoid fuel leakage or oil entering the compressed gas chamber. The design of the piston must take into account the position and size of the piston ring and other factors. The second is strength and vibration resistance. The material of the piston should be high temperature resistant, corrosion resistant, and have high relative density and high strength. At the same time, the operation method (such as cloud shopkeeper, etc.) can be appropriately adopted to extend the service life and improve the performance requirements.In addition, the manufacturing process of pistons is also very important. It is usually composed of material particles, high-temperature heat treatment and machining and other stages. Each link requires very strict and professional manufacturing processes, tools and equipment to ensure the durability, accuracy, quality and reliability of the final production piston. Four. Maintenance of pistons and maintenance of pistons is an important part of the engine, so regular maintenance and maintenance are needed to extend its life. The specific methods are as follows: First, it is necessary to keep the inside of the engine clean and dry to prevent damage and corrosion caused by impurities and humidity. Secondly, the gap and seal between the piston and the cylinder need to be replaced regularly to ensure that their quality is qualified and suitable. Finally, it is also necessary to maintain and replace the corresponding parts of the power transmission components (such as camshafts, common shafts, etc.). In a word, as an important part of the engine, the piston has an important impact on the performance and efficiency of the car.With the continuous development and progress of technology, the manufacture and design of pistons are also constantly improving. The maintenance of the piston is also an important link to ensure the safety and smooth operation of the car.

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