Pharmaceutical raw materials HS code checks

Engine composition: From the appearance,Pharmaceutical raw materials HS code checks the engine is one of the core components in automobiles, ships, aircraft and other machinery and equipment.It is composed of many parts, and these parts have their own different functions, some of which determine the performance of the engine, and some of which play a key protective role. The following is a detailed introduction to which parts the engine mainly consists of. 1. Cylinder block and cylinder head: The cylinder block is one of the main components of the engine. It mainly plays the role of fixing and supporting other parts. The main material of the cylinder block is high-strength cast iron, and some high-end models are made of aluminum alloy, which has the advantages of light quality and good thermal conductivity. The cylinder head is closely connected to the cylinder block, which plays the role of a closed cylinder. Two. Cylinder: Automobile engines usually adopt four-cylinder, six-cylinder, eight-cylinder and other cylinder forms. It usually presents an oval cross-section, which is the most important part of the engine. Because the cylinder needs to withstand extremely high pressure and high temperature environment, it is usually machined with cast iron or aluminum alloy.3. Piston, piston ring and crankshaft: The piston is a small cylinder inside the cylinder, which is connected to the connecting rod on the crankshaft by the pin shaft. The main function of the piston is to regulate the gas pressure in the cylinder and work with the gas in the cylinder at the same time, so that the engine can work normally. The piston and the cylinder are connected through the piston ring, so that the pressure in the cylinder will not be leaked. The crankshaft converts the reciprocating motion of the piston into rotational motion through the connecting rod, and transmits the kinetic energy converted by the engine to the wheels. Four. VALVE AND SHOCK EXPLOSION: THE MAIN FUNCTION OF THE VALVE IS TO PROVIDE FRESH AIR IN AND EXHAUST GAS DURING COMBUSTION, WHILE THE SHOCK EXPLOSION IS TO AVOID EXPLOSION DURING COMBUSTION. In general, the engine has four valves and one shock absorber, but some high-end engines may have more valves. 5. Oil pump and fuel systemUnification: The oil pump sends gasoline or diesel into the fuel system, and then injects the fuel into the cylinder through the fuel injector. The engine fuel system usually includes fuel tank, oil pump, fuel injector, preheater, fuel filter and other parts. At the same time, there is also an oil supply system, which sends oil into the engine to ensure that the fuel can move smoothly. 6. Ignition system: The ignition system provides various equipment such as ignition circuits, batteries, generators, ignition coils, ignition plugs, etc. These equipments cooperate to complete the combustion process. The ignition ignites the mixed gas to make it burn, and then generates power through the piston to start the car. 7. Cooling system: The engine generates a lot of heat when working, so it is necessary to reduce the temperature of the engine through the cooling system to ensure the normal operation of the engine. The cooling system usually consists of water tanks, pumps, water pipes, radiators, fans and other parts.Water pumps and fans mainly play the role of fluid cooling and gas cooling, while radiators radiate heat to the outside world. The engine is one of the core components of machinery and equipment such as automobiles, and it is composed of many components. Each component is indispensable, and their function is to coordinate with each other to ensure that the engine can work normally. By an in-depth understanding of the composition of the engine, we can better understand those parts that look complex on the surface but play an important role.

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