In the northern or western plateau region of China in winter, due to the low ambient temperature, the construction machinery air compressor is difficult to start. The main reason is that the air temperature of the cylinder of the diesel engine air compressor does not reach the temperature required for starting, and the pressure of the compressed air in the cylinder is also significantly lower than the pressure required for starting; the optimal working temperature of the battery is 20-40 °C. As the ambient temperature decreases, its output capacity also decreases accordingly, resulting in a decrease in the power of the diesel engine air compressor start system; when the ambient temperature is low, the viscosity of the oil becomes larger, and the resistance between the frictions increases, so that the diesel air compressor The starting speed decreases, at the same time, the viscosity of the diesel oil increases, the quality of the spray atomization deteriorates, and the ignition lag period is prolonged; the air density and the oxygen content in the air decrease with the increase of the altitude, and the altitude is higher, the diesel engine air pressure The harder it is to start.
Under low temperature conditions, in order to ensure that all types of construction machinery can be safely put into use under cold conditions, daily maintenance should be done, and it is best to install a low temperature auxiliary starting system.
Common low-temperature start-up methods: (1) Select low-performance diesel engine air compressor oil. This type of air compressor oil has low temperature viscosity, good lubrication between friction pairs, and low starting resistance, which is good for starting. The multi-stage oil currently used, such as the number before 15W/40W, the better the low-temperature fluidity of the oil. Therefore, it is recommended to use 10W or 5W oil at low temperatures.
(2) Using a battery with good low temperature performance, if necessary, the battery can be insulated to ensure that it can be charged normally under low temperature conditions and has sufficient output current, thereby improving the power of the starting system.
(3) Filling cold starter liquid (4) Flame preheating start (5) Circulating water heating system (also called fuel heater heating system) (Land) Other preheating methods In addition to the above preheating method, heat can also be used Various methods such as water preheating, steam preheating, and electric preheating are used for low temperature start-up.
Cobalt Alloy Powder
Cobalt-based alloy powders are commonly used in laser cladding processes due to their excellent wear resistance, high temperature strength, and corrosion resistance. These alloys typically contain varying amounts of cobalt, chromium, tungsten, and nickel, among other elements, to achieve specific properties.
The laser cladding process involves melting the cobalt-based alloy powder using a high-energy laser beam and depositing it onto a substrate to form a protective coating. This coating helps to enhance the surface properties of the substrate, such as hardness, wear resistance, and corrosion resistance.
Some common cobalt-based alloy powders used in laser cladding include:
1. Stellite: This is a well-known cobalt-chromium-tungsten alloy that offers excellent wear and corrosion resistance. It is often used in applications where high temperatures and abrasive environments are present, such as in oil and gas drilling tools, valves, and pump components.
2. Tribaloy: Tribaloy alloys are cobalt-based alloys that contain varying amounts of chromium, molybdenum, and silicon. They are known for their exceptional high-temperature strength and resistance to galling, making them suitable for applications in the aerospace, petrochemical, and power generation industries.
3. Haynes alloys: Haynes alloys are nickel-cobalt-chromium-molybdenum alloys that offer excellent high-temperature strength, oxidation resistance, and corrosion resistance. They are commonly used in applications where extreme heat and corrosive environments are present, such as in gas turbines and chemical processing equipment.
These cobalt-based alloy powders are available in various particle sizes and can be tailored to meet specific application requirements. They can be used with different laser cladding techniques, such as powder-fed laser cladding or blown powder laser cladding, depending on the desired coating thickness and properties.
Overall, cobalt-based alloy powders for laser cladding provide enhanced surface properties and improved performa
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