With the continuous upgrading of environmental protection standards, as the world's leading supplier of commercial vehicles, Germany has a series of clean and environmentally friendly engines that can meet various emission regulations from Euro III to Euro VI, while German Man guarantees the improvement of the entire vehicle technology. , has always attached great importance to research in the field of engines . With the upgrading of China's environmental standards, the implementation of the National IV standard has been put on the agenda. German Man has two main methods for meeting the national IV standards: one is the D20 and D26 large displacement series engines, and the SCR post-processing technology is used. The other one is applied to the D08 series low-emission engines, which can meet the national IV emission standards without the need of installing post-processing systems. It can be said that German Mann has made adequate preparations to meet the national IV standard. Facing China IV, everything is ready As we all know, German Man can meet very strict emission standards in the European market. In China, when Mann implemented the national IV emission standards, based on China's oil products, roads, and different use environments, in order to ensure better vehicle operation, Germany Mann made adaptive improvements to meet the needs of the Chinese market. For the D20 and D26 large-displacement series engines, German Man used SCR after-treatment technology. This series of engines has been in China for more than two years, fully adapting to the Chinese car environment, and the operation effect is very satisfactory. Not only that, this series of engines can also adapt to very harsh environments and fluctuations in oil quality. For the D08 series low- and medium-displacement engines, the German Mann technology can meet the national IV emission standards without the need of installing a post-treatment system. This series of engines not only has a simple structure, but also has low maintenance cost, use cost, and fuel consumption. It can adapt to low-quality oil products and can endure fuels with sulfur content up to 500 ppm. Meet national IV standards without post-processing system When Euro IV emission standards were implemented in Europe, German Mann adopted the traditional second-generation EGR+DPF technology because of its post-processing system. This technology has higher requirements for oil products. Therefore, in view of the high sulphur content of oil products in regions other than Europe, such as China, German Mann developed an engine without a post-processing system. This engine uses the third generation of EGR technology, evolved from the Euro V engine. The difference is that in Europe, EGR+DOC lines are used. In China, because only the National IV standards are currently implemented, German Mann removes post-processing and recalibrates the ECU on the basis of the original technology, and can achieve the national IV emission standards. The engine power of this technical route covers 250-340 horsepower. This technology has already been applied in Europe, and is a mainstream technology of Germany in response to Euro V emission standards. In addition to eliminating the DOC device, this technology will also increase the combustion pressure of the engine and help reduce particulate emissions. At the same time, the amount of recirculated exhaust gas will increase. In the past, only 20% of the recirculated exhaust gas can now reach 25% 0 to 30%, and in theory can even reach 35%. As a result, the amount of recirculated exhaust gas increases, and the amount of nitrogen oxides decreases accordingly. German Mann has also made corresponding improvements in machinery. For example, the intake pressure is increased. Generally, the intake pressure of the engine is only 1.8 to 2 bar, while the German Mann's absolute pressure is increased to 4 bar and the relative pressure to 3 bar, which fully increases the intake air volume, so that the combustion is more complete and the combustion efficiency is improved. In addition, German Man also adjusted the map characteristics. After two-stage supercharging and two-stage intercooling, the outlet temperature of the intercooler can only be 5° higher than the outdoor temperature. After these improvements, the engine performance will be improved a lot and the DOC will be removed. The device can also fully meet the requirements of State IV. The main technical features of this series of engines: 1. Fuel system: 1800 bar common rail fuel system, 9-hole injector. 2. Inlet cooling system: two-stage booster and two-stage intercooler technology (low pressure booster/low pressure medium cooler, high pressure booster/high pressure medium cooler); Cooling method: Coolant cools air. The cooling liquid used for the intermediate cooling first undergoes two times of cooling, and its temperature is almost the same as the outside temperature, ensuring that the inlet temperature after the intercooling is not higher than the ambient temperature by 5 degrees as required. The absolute value of the intake pressure reaches 4 bar. 3. Improve combustion chamber structure, optimize combustion, increase combustion pressure and temperature. 4. Closed-loop control of EGR rate to ensure that the engine's performance and emissions meet the requirements. The EGR rate of this series of engines has increased from the previous 20% to 25% or even higher. 5. Control map improvement. In short: on the one hand, by greatly increasing the intake air quantity, increasing the fuel pressure and fuel atomization effect, increasing the combustion pressure and temperature, improving the combustion chamber, and optimizing the combustion control map, the combustion is extremely complete, and the amount of exhaust gas for recirculation is increased. have enough space. On the other hand, in the case of ensuring that the engine performance and particulate emissions and other emission indicators meet the requirements, the amount of recirculated exhaust gas is increased and the nitrogen oxides are reduced. Even if the DOC is not configured, it can satisfy the National IV standard.
The 1 boom drilling rig is the main drilling equipment in the underground hard rock mine.
1 Boom Drilling Rig,Underground Digging Trolley,Drifter Mining Rig,Hydraulic Drifter Drilling Machine Henan YK Prospecting Machinery Co., Ltd , https://www.yyundergrounddrillingrig.com
Manipulator drilling rig with high level of automation and computerization is not very attractive to mine.
The mine hopes to use the trolley with compact structure, flexible movement, high reliability, high efficiency and high accuracy.
Small enough to enter the shaft through a small section
Maneuverable and flexible enough to walk in winding and inclined passages
The versatility can be used to drill hole, bolt hole and cut hole in all directions.
In recent years, several major rock drilling equipment manufacturers in the world, in order to meet the requirements of mechanized mining of thin ore bodies, have successively developed a variety of small rock drills with high power, which can be used to complete the rock drilling operations that could only be completed by pneumatic drill, so as to significantly improve the efficiency of rock drilling and reduce ore dilution rate.
Hydraulic drilling jumbo is mainly used for tunneling construction in metal mine and other underground engineering. One drilling boom, advanced hydraulic rock drilling system and anti-jamming mechanism ensure the jumbo rapid drilling speed and high efficiency. This jumbo features of great mobility, short turning radius and strong gradeability, thus can improve working environment and get efficiency, quality development.
Robust universal drilling boom creates ideal face drilling coverage. Automatic parallelism and 360 degree roll-over enable easy, fast and accurate positioning for face drilling, sideway drilling and bolt hole drilling.
The layout of components provides excellent vision for the operator in drilling and travelling.Powerful and well balanced 4-wheel drive chassis allows the rig to move through limited space and tough terrain in the mines.
Duo-circuit service brake and enclosed multi-disc parking/ emergency brake ensure safety in tramming and on ramp slope.
Field proven high frequency hydraulic drifter delivers high performance. Trapezoid shaped percussion piston optimizes shock wave transfer efficiency, enhancing penetration and decrease drilling consumables costs.
Comfortable operator station provides safe working condition. Many automatic features simplified the drilling control and helps the miners to concentrate on fast and accurate drilling.
All service points are easily accessible, which simplifies daily routine maintenance for this 1 boom drilling rig in rock ore quarry and underground tunnel drilling blasting DTH purpose.