Under low-temperature conditions, the increase in fuel viscosity is not conducive to the atomization and combustion of fuel, and the deterioration of the lubricant's fluidity increases the resistance of various moving parts. In addition, the impact of factors such as the battery's ability to work can easily lead to Engine start-up difficulties. Machine wear, power reduction, increased fuel consumption, and reduced power performance. In order to ensure that all types of construction machinery can be put into use safely under cold conditions, daily maintenance should be done. It is best to install a low-temperature auxiliary starting system. Four common low-temperature startup methods: (1) Fill cold start liquid Cold start liquid is an auxiliary starting fuel (composed of ether, low volatilization hydrocarbon and low condensation point oil with additives), which is added The low freezing point oil with additives can improve the lubrication conditions of the cylinder wall and achieve the purpose of starting. Since ether has good volatility, easy ignition, and flammability, the higher the content of ether, the lower the temperature at which the Diesel Engine can be started directly, but the greater the degree of crude operation of the diesel engine at startup. Therefore, when using a cold starter fluid, it must be filled in a prescribed amount, and must not be added excessively. Although this kind of starting method can start the engine instantaneously, but due to the low temperature and high viscosity of the oil at this time, the oil on the cylinder wall is not much for a period of time after starting, the lubrication condition is poor, and the engine body reciprocates and rotates when the engine works. Dry friction will form between the moving parts, which will increase the wear of the parts. Therefore, after starting the engine with cold starting liquid, do not increase the throttle operation. When this starting method is selected to start, the starting liquid with better atomization should be selected. , And control the injection time, injection position and injection volume. In addition, avoid injecting the starter fluid directly from the air inlet of the air cleaner, so as not to affect the quality of the air filter filter element and to increase the injection amount of the lifting fluid, causing the engine cold machine to start running and overspeed. Based on the above description, it is advisable to use cold start fluids with caution. (2) Flame preheating The minimum operating temperature of the flame preheating device is -40°C. The working process is electronically controlled. The flame preheating starting device is generally composed of an electronic controller, a solenoid valve, a temperature sensor, a flame glow plug, a fuel pipe and a wire. The working process of the device is: after the glow plug is heated to 850-950°C, the starter is turned on, the solenoid valve automatically opens the oil circuit, the fuel is supplied to the glow plug through the fuel pipe, and the flame is preheated to start. After the engine is started by the device Due to the low temperature and high viscosity of the oil at this time, the oil on the cylinder wall is not much and the lubrication conditions are poor after starting. The dry friction will also be formed between the parts of the engine body that reciprocate and rotate during the operation of the engine. The wear of the parts is increased; due to the high temperature generated in the friction, the metal on the friction surface can be melted, and the parts can easily become stuck. Therefore, after using the flame preheating device to start the engine, you should not avoid increasing the throttle operation. Otherwise, it may easily cause a cylinder accident. (3) Recirculating water heating system (also called fuel heater heating system) This is a new low-temperature auxiliary starting method adopted in recent years. The low-temperature starting method is through the fuel heater. The attached pump pumps the coolant in the engine body. It is withdrawn, heated by a fuel heater and recycled to the engine body to heat the engine and start the engine at low temperature. This low-temperature start-up method requires 30-40 minutes for the entire heating process. It can heat the engine body to about 40-50°C. At this time, the engine oil can also be heated, the viscosity of the oil can be reduced, and the lubrication condition of the engine under low temperature conditions can be improved. To make the engine start smoothly. This kind of low-temperature starting method has obvious advantages, and it greatly improves the starting performance of the engine under cold and cold conditions. It is recommended to adopt it. The ZLG50C high prototype loader and the TLG210A high model bulldozer use this low-temperature start-up method to achieve a good start-up effect. (4) Other preheating methods In addition to the above preheating methods, hot water preheating method (hot water injection and cooling system that heats up to the boiling point) may be adopted. Steam preheating method (upper steam passes through the pipeline from the water pipe of the water tank Into the cooling system, or directly into the engine cooling water jacket), electric preheating method (insert the heater directly into the cooling system or engine oil, this method is high in thermal efficiency, use more convenient) and other methods for low temperature start.
Henan Qianli Machinery CO. Ltd is a profession manufacture of tractor, rice machine, Reaper Machine, Power Tiller, garden machine and other farm implements. Our factory was established in 1987 and has more than 30 years of production and sales experience. We focus on providing customers with high-quality products and excellent services.
Engines include gasoline engines and diesel engines, which provide power for walking tractors, power tillers and other machinery.
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