In the first five months of this year, the cumulative sales of heavy trucks in China were nearly 210,000 units, a year-on-year increase of 63.2%, after the market recovered last year. The development of heavy trucks in China is not only reflected in sales figures, but also reflected in the technical performance of products. Over the past few years, almost all mainstream heavy truck companies have launched their own iconic products through technological upgrades. These products are no longer the “new products†that lacked technological content and “replaceable drugs,†but focused on technological leapfrogging. Quality upgraded products. At this point, the upgrading of China's heavy trucks has freed itself from superficial articles.
Past new products are not "new"
For a long time, our country's heavy truck products have been lacking in new ideas. Even the so-called "new products" are mostly simple changes in appearance, interior, and container size. Upgrades seldom involve engines, transmissions, axles and other key components that determine the level of vehicle technology and manufacturing. change. Therefore, although new products emerge in endlessly, new products that are truly upgraded are rare.
"At that time, I did not want to carry out deep technical upgrading, but there was no strength." A person from China National Heavy Duty Truck admitted to reporters. According to him, due to the previous lack of core technology in the domestic heavy truck industry, there are certain difficulties in the research and development of new products. However, due to competitive pressures, companies must continue to introduce new products. Therefore, they can only do some superficial articles in places with low technological content. Kung fu, which led to the development of China's heavy trucks and reliability in a relatively long period of time to improve slowly.
Status Quo: Quality Upgrading, Technology Upgrading to Main Attack
With the development of China's heavy-duty truck companies, technical upgrades and quality upgrades that have not been realized before have become the main direction of major mainstream heavy truck companies. So far, many heavy trucks have their own iconic technology.
Futian Europe Heavy Truck Auman ETX, which was listed in March of last year, has a number of advanced technologies, of which the unique drive axle technology is a major highlight. Auman ETX is equipped with a 485 single-stage deceleration drive axle. The drive axle adopts advanced technologies such as brake gap automatic adjustment arm, high-performance oil seal and wheel-to-wheel differential lock. It has a compact structure, strong bearing capacity, and high fatigue resistance. Features. Compared with the 13-ton dual-speed reduction bridge commonly used in heavy trucks in China, the vehicle axle also has the advantages of high transmission efficiency and fuel economy.
The fuel-saving II engine used by China National Heavy Duty Truck on the HOWO heavy truck is also the result of upgrade of core technology of heavy-duty trucks. The engine has improved the air supply system and the oil supply system. Bosch PS8500 fuel injection pump is used. The supercharger with air release valve replaces the original common supercharger, so that the matching between the air supply system and the fuel supply system is more perfect and improves. The economy and power of the engine. After 6,000 hours of uninterrupted machine testing, the fuel consumption per 100 kilometers is more than 10% lower than that of similar domestic products, and the torque reserve factor is increased by 30%.
At the end of last year, the Shaanxi Royal Auto Heavy Duty Truck, which was listed at the end of the year, made major improvements and upgrades in the wind resistance design of the cab. In addition to the roof deflector, an A-pillar deflector with a grille is also provided. The deflector can divert the upstream airflow and reduce the wind resistance. Not only that, Deyu's shroud height can be adjusted to reduce wind resistance more effectively.
In addition, the Eaton technology transmissions used by FAW Jiefang Aowei, Cummins ISDe and ISLe electronically controlled engines equipped by Dongfeng Tianlong have greatly improved the quality of heavy trucks in China, and have really replaced the upgrades. Product replacement just started
At present, more and more heavy truck companies have realized that quality upgrading and technology upgrading are the priorities for heavy truck upgrading. Heavy truck technology is changing with each passing day. In terms of the technology and quality of domestic heavy trucks, there is a wide gap between them and the international advanced level. It is worth noting that the recent mass production of the Liberation J6 has greatly reduced the gap between China and the international advanced level. Some experts believe that it will trigger a full-scale replacement of heavy trucks in China.
It is understood that high power, high load carrying capacity, high safety, high comfort, high reliability, low emissions, and intelligent electrical systems have become the development direction of China's heavy truck product technology. For example, diesel common-rail electronically controlled fuel injection technology is a technology used by international advanced heavy trucks, but it has just begun to be applied in China. With the implementation of the national 3, 4 emission standards, the common rail electronically controlled fuel injection technology will accelerate the application speed on China's truck engines. Emissions post-processing technology for trucks has also received attention. Particle traps that have been widely used abroad will also be used on domestic heavy trucks. Advanced technologies such as these can only be used in large numbers on domestic heavy trucks to make continuous progress in China’s heavy trucks that have just crossed the watershed of upgrading.
Sharpening is an indispensable preparation procedure before drawing die. According to the introduction, the rotary forging machine has been used in the coarse wire rolling abroad. It is also useful for electric rolling, that is, the two ends of the wire are clamped with electric pliers, and then the wire is stretched into a point and broken. At present, all the domestic use of rolling rod tip, mainly the reciprocating rotary old rolling machine and eccentric rolling machine cycle rotation. Another lever manual reciprocating small tip rolling machine, specially for 1 mm below the use of fine steel wire.
Fold and edit the structure of this section sharpening machine
The reciprocating rotary tip rolling machine is used for decades of old equipment, simple structure, suitable for small factories and production of low carbon steel wire.
This equipment is composed of three parts: transmission, frame and rolling stick. It is reduced by belt wheel and gear, and the big gear rotates about 60 times per minute. A short eccentric shaft is attached to the side of the big gear, which makes the rolling stick rotate around 50° through the arm and connecting rod. If the position of the arm and the connecting rod is changed, the Angle of the rolling rod can be changed.
This old fashioned bar is 100~120 mm in diameter and has 8~16 slots. According to the diameter of the wire, slot from large to small in order. Slot compression rate is: coarse steel wire about 20%, medium and fine specification about 15%. The slot is concentric and symmetrical with the outer circle.
The working principle of the sharpening machine is shown in the figure below.
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