What are the types of brakes?

Preventive pursuit of balanced braking is that the brake balance of the wheels when the vehicle is braking is consistent. Both front wheels overlap. Direction deviation can be prevented, and the two rear wheels coincide. Can prevent the body side slip. When a car brakes on ice, snow, rain, and wet roads, the detachment and tail will not be able to control the vehicle to varying degrees. If the two situations occur at the same time, normal road braking will also lose complete control of the vehicle. Heavy transport vehicles once out of control, the consequences are even more serious. Therefore, in order to avoid the occurrence of major traffic accidents and ensure the safety of people's lives and property, heavy transport vehicles resolutely eliminate all "unbalanced" car brakes. The brakes move the tail.

What are the safety requirements for the electrical part of the brake?

Under the working voltage, it works according to the working mechanism, load duration and cycle of the tractor. When the brake reaches a thermal steady state, the temperature rise of the brake coil is measured. The measurement method adopts GB 755-2008 "Rotating Electrical Machine Rating and Performance" 8.6.2 Resistance Method for measurement and calculation. Brake coil temperature rise shall not exceed 80K when insulation class B is used. When insulation class F is used, the temperature rise of the brake coil shall not exceed 105K. For the brake with the exposed surface temperature over 6(TC), add the warning display to prevent scald.

What should be noted when checking the brake coil control circuit?

Carefully check the electrical schematic and wiring diagram, and carefully analyze the number and mutual independence of electrical devices in the control circuit. It can be seen that XC, SC and YXC are not independent, but mutually controlling relationships.

Production Difficulties and Control of High Toughness Ductile Iron

High toughness ductile iron is a kind of gray cast iron with excellent mechanical properties. The molten iron is solidified to form spherical graphite. The strength and toughness of high-toughness ductile iron are higher than other cast irons. Generally, before pouring, a small amount of spheroidizer (usually magnesium, rare earth magnesium alloy or rare earth alloy containing cerium) and inoculant) are added to the molten iron, usually ferrosilicon), sometimes replacing cast steel and malleable cast iron in the machinery manufacturing industry. So, let's understand the difficulties and control of high toughness ductile iron production together!

How to Smelt Cast High Toughness Ductile Iron

Casting high toughness ductile iron castings and shortening the supply cycle is the direction that enterprises strive to pursue in the manufacturing process. It is to reduce heat treatment links and save intermediate transportation costs on the basis of meeting special performance requirements. Especially in the current fierce market competition Under the environment, the production cost of the enterprise has been effectively reduced, take QT600-10 material as an example to introduce its control method, then, let's learn how to melt cast high toughness ductile iron!

Some Knowledge Points of High Strength Ductile Iron

For the smelting of high strength ductile iron, cupola and power frequency furnace are widely used at home and abroad. In general, hot metal desulfurization. At present, most of the hot metal desulfurization methods use porous plug desulfurization method, that is, blowing N2 gas, adding CaC2 or composite desulfurization agent stirring desulfurization. The stability of desulphurization is of great significance for melting molten iron of crankshaft. For example, induction furnace melting can better control the range of alloy composition, stabilize the spheroidization, and easily ensure the quality of molten iron.

Function and characteristics of high strength ductile iron

It has been more than 60 years since the discovery of high-strength ductile iron. Because of its good comprehensive performance, convenient manufacturing and low cost, it can not only replace gray cast iron to improve the quality of cast iron materials, but also replace cast steel, forged steel and welded parts to reduce production costs. According to U.S. statistics, 40% of the total output of high-strength ductile iron is to replace forged steel parts, stamping parts and weldments, 25% is to replace malleable cast iron parts, 20% is to replace gray iron parts, 15% is to replace cast steel parts. Internationally, the proportion of high-strength ductile iron to the total number of castings and the proportion of high-strength ductile iron/cast steel are regarded as important indicators to measure the level of industrialization of a country.

Production Factors of As-cast Low Temperature High Toughness Ductile Iron

With the rapid development of China's economy and the introduction and absorption of foreign high-end castings, the quality requirements of high-performance, high-efficiency and high-reliability equipment in various fields are increasing day by day. Low temperature and high toughness ductile iron materials are widely used in wind power generation, high-speed railway and other fields due to their high impact toughness at low temperatures. Then, let's learn about the production factors of cast low temperature and high toughness ductile iron!

[Industry Dynamics] Ministry of Industry and Information Technology: Five aspects to solidly promote the high-quality development of the manufacturing industry

On July 23, Huang Libin, director of the Operation Monitoring and Coordination Bureau of the Ministry of Industry and Information Technology and spokesman, said at a press conference on the development of the industrial communications industry in the first half of 2019 that the manufacturing industry is the foundation of a country and the foundation of a strong country. The Party Central Committee and the State Council attach great importance to the high-quality development of the manufacturing industry and regard it as an important support for steady growth, efforts should be made to "strengthen, innovate, optimize the structure, promote integration, strengthen enterprises and optimize the environment" to promote the high-quality development of the manufacturing industry.

[Industry Dynamics] The Ministry of Ecological Environment said: This winter will not be a unified organization of steel mills, foundries to limit production or stop production.

On July 26, Liu Youbin, spokesman for the Ministry of Ecology and Environment, said that the Ministry of Ecology and Environment plans to list enterprises that have fully achieved ultra-low emissions as Class A. Such enterprises do not need to take emission reduction measures such as limiting production or stopping production when dealing with heavy pollution this winter, so as to set up benchmark enterprises and promote the improvement of industry governance level.