The hottest wheel loader has seen a resurgence of

The scientific and technological progress of wheel loaders is rising again

Guide: in 2007, the characteristics of loader products, such as energy conservation, safety, comfort and easy maintenance, have received widespread attention in the industry. During this period, a large number of such wheel loaders were put into the market. However, the insufficient supply of tires is still a weakness in the wheel loader supply chain

in 2007, the characteristics of loader products, such as energy saving, safety, comfort and easy maintenance, have received widespread attention in the industry. During this period, a large number of such wheel loaders were put into the market. However, the shortage of tires is still a weakness in the wheel loader supply chain

in January 2008, the new engine emission regulations for the power range from 37 to 75kW came into force; The emission regulations of 130 ~ 560kw and 75 ~ 130kW engines were also revised in 2006 and 2007 respectively. Affected by this, almost all newly delivered wheel loaders are equipped with engines that meet the stage iiia/tier 3 standard. If you choose a wheel loader at the CONEXPO con/AGG Expo in Las Vegas in March 2008, those exhibits will definitely dazzle you. This paper introduces several products of the world's famous loader manufacturers with characteristics in energy saving, safety and comfort, as well as some issues of general concern in the manufacturing process of loaders

the HLA loader of Hyundai Corporation of Korea is one of the largest wheel loaders at the CONEXPO con/AGG Expo, with a working weight of 29.3t and a rated power of 250KW. According to the supply contract signed by Hyundai of Korea and case of the United States in 2006, HLA loaders met the audience with the appearance style of case company at the Expo. According to the agreement, HLA loaders will be sold under the case trademark in North America, Europe, Africa and the Middle East. In this regard, J.J. Kim, executive vice president of Hyundai Heavy Industry, said that Hyundai Heavy Industry is very happy that the quality and performance of this equipment can be recognized by case, the world's top manufacturer. He believes that this is inseparable from Hyundai Heavy Industry's world-class manufacturing capacity

case also exhibited several new products at the Bauma exhibition in Munich in 2007, among which the 821e loader with a working weight of 17.2t, a rated power of 159kw and meeting the stage iiia/tier 3 standard is the most eye-catching. The maximum bucket capacity of the machine can reach 3.4 M. Case said that the new engine equipped with the 821e loader can reduce fuel consumption while providing 11% more power performance than its previous generation, and it has a higher unloading height, and the bucket capacity is 4% larger than its previous generation

Hyundai's new dash 7a loader at the Bauma exhibition in Munich in 2007 not only uses a new engine, but also has some other features: a new embedded operating lever, automatic downshift function, cab control panel equipped with diagrams, automatic control mode, etc., which reduces transmission time, thereby reducing fuel consumption

reduce fuel consumption

indeed, fuel consumption is one of the main concerns of many potential loader users. Jonas thorsie, market director of wheel loaders at Volvo, said that according to an industry data, fuel prices have risen fourfold in the past three years, and hybrid loaders have appeared on the market. According to Jonas thorsie, hybrid loaders can speed up the construction of relevant standards and power battery traceability management system to save 50% of fuel consumption

at the CONEXPO con/AGG Expo in March, 2008. Volvo exhibited a l220f oil electric hybrid loader. The basic principle of the hybrid power of this machine is that when the loader is working at light load or idle speed, the generator charges the battery. When the loader needs to accelerate or dig up, the battery in turn provides power to the motor for auxiliary work to increase power. Some people may think that the battery pack will increase the quality of the whole equipment and easily increase fuel consumption. However, construction machinery products such as loaders and excavators need special counterweights. If the battery pack is used as a part of the counterweight, the weight of the whole machine will not be increased due to the installation of the battery pack. Obviously, this problem does not need to be too worried

like Volvo, the problem of fuel consumption has also attracted great attention from caterpillar. Vincent migeotte, manager of the mining and gravel processing Department of caterpillar in Europe, Africa, the Middle East and CIS countries, believes that fuel consumption is one of the most concerned problems of users. He said that trying to achieve the best match between the fuel supply system and the engine speed is one of Caterpillar's main means to reduce fuel consumption and improve fuel efficiency

under the guidance of this concept, several new loaders recently launched by caterpillar, such as 950h, 962h, 966h, 972h and 980h, adopt ACERT 6-cylinder engine, and adopt new ADEM microprocessor fuel injection electronic control module and automatic electronic fuel injection system. The atomization degree of fuel oil is improved, and the combustion is more sufficient. Most of the screw barrels do not need cooling and are more efficient. At the same time, caterpillar has taken many measures to reduce fuel consumption and maintenance work, including the adoption of "engine idle management system (EIMS)" and grease accessory devices specially designed to improve fuel efficiency, the establishment of a new hydraulic parts maintenance center, the adoption of hydraulic filter elements with an average replacement interval of 500h and transmission filter elements with an average replacement interval of 1000h

insufficient supply of tires

Wilbert bloom, European Sales Assistant for Hitachi wheel loaders, said that despite some challenges, the overall market for loader products in 2007 was good. The demand for wheel loaders has been growing over the past 12 months But there are also some problems for manufacturers. He believes that the main problem faced by Hitachi now is that suppliers, especially tires and hydraulic parts, cannot meet production needs. Hitachi is working hard to solve this problem and strive for a good solution in the next year

wilbert Blom said, "the shortage of tires has become one of the most prominent problems, especially the shortage of large tires. Because our purchase of large tires is not as large as that of caterpillar, Volvo and other companies, we do not get relatively priority tire supply."

in this regard, Mr. migeotte of caterpillar said that the company guaranteed to configure high-quality tires for the whole machine through a certain period of tests. At the same time, it also chose different suppliers from time to time to solve the problem of tire supply for large loaders. The supply contracts signed with several major tire suppliers enabled caterpillar to solve the problem of tire shortage

spacious comfort

in today's loader market, the driving comfort of the whole machine has become one of the biggest selling points. WA, WA and Wa, three new wheel loaders with bucket capacities ranging from 3.3 to 6.0 m launched by Komatsu Corporation of Japan, all adopt high roof cabins equipped with air conditioners, providing more spacious cab space, and are equipped with adjustable operating levers and ergonomic air heated seats. The noise in the driver's ear of 71 ~ 72db also makes these three new loaders of Komatsu company very environmentally friendly. The three loaders exhibited by Komatsu company all use engines that meet the emission standard of tier 3/stage IIIA. At the same time, the load sensing hydraulic system can also enhance the handling of the equipment, shorten the cycle time and improve the digging force

the zw180 loader launched by Hitachi in 2006 is a supplement to the zw220, zw250 and zw310 series products. The machine adopts an engine that meets the Tier 3 emission standard, with a maximum bucket capacity of 3.1 m. It adopts a new load hydraulic sensing system, which can improve the bucket operation efficiency; The cab is equipped with adjustable automatic heating seats and adjustable operating levers; The air conditioning control system has also been improved

the bucket capacity of l524 2plus1, l5282plus1, l538 2plus1 and l542 2plus1 loaders launched by Liebherr ranges from 2.0 to 2.7m, and 86Kw or 105kW engines complying with Tier 3 standards are selected; Its driving comfort is mainly reflected in the larger cab and wider cab door. The working devices of this series of loaders can choose two types: Z-shaped connecting rod structure and parallel lifting structure

among Liebherr Dourong 3.2m loader products, the new l550 2plus2 replaces the previous l544 2plus2 product. The maximum tipping load of l550 2plus2 loader is 11.7t, and the 130kW engine also provides it with more powerful power performance than the previous generation products. The l586 2plus2 loader with a working weight of 31t is the flagship product of Liebherr's loader series. It uses an engine that meets the Tier 3 standard Maximum power 250KW; Configure a bucket with a standard bucket capacity of 5.5m

Doosan's latest loader product is the dl250 with a working weight of 14.5t. The machine is equipped with a 121kw Doosan dl06 engine. The torque of the dl250 is 9% greater than that of the mega 250-v. a more spacious cab is used to prevent the experimental machine from exceeding the experimental range and damaging the equipment, which also provides a broader vision for the driver; The machine is quieter, and the air conditioning system has also been improved. At the same time, there are two control systems, automatic and manual, for the driver to choose

New Holland impact testing machine testing method the company's latest loaders are w170b, w170b TC, w190b and w270b, of which the minimum power is 145kw and the maximum power is 239kw. Among these loaders, the minimum bucket capacity is 2.4m and the maximum bucket capacity is 4.6m. CNH engine and ZF power transmission system are adopted, and Cummins engine is also selected for w270b loader. They have greater torque than the previous products of New Holland. Among them, the 145kw w170b working device can be equipped with Z-type or parallelogram connecting rod, and can be equipped with a bucket of 2.4 ~ 2.8m. The engine power of 190B is 169kw, which can be equipped with 3 5m bucket. The engine power of w270b is 239kw, which can be equipped with a bucket of 4.0 ~ 3.6m

in addition, Terex's new wheel loaders, TL 420 and TL 450, are equipped with 4.2m and 4.5m buckets respectively, and are equipped with 216kw and 231kw Cummins engines that meet the Tier 3 standard. They also adopt ZF transmission system, Rexroth load sensing hydraulic system and parallelogram connecting rod working device. The unloading height of these two models is 3.15m. As a standard configuration, the hydraulic damping system can make the driving smoother

another new wheel loader tl210 of Terex company is equipped with 119kw engine that meets the emission standard of stage IIIA. It can be directly equipped with a 2.1m bucket or a 2m bucket to obtain faster lifting speed. Hydrostatic drive can make the maximum driving speed reach 40km/h. The front connecting rod working device takes into account the advantages of parallelogram and Z-shaped connecting rod

future development

Mr. bloom of Hitachi said that driving comfort, safety and noise control will remain the most concerned issues in the loader industry for a long time to come. Due to the increasing scarcity of loader drivers, the above factors become more important when users buy loaders. Improving the driving comfort of loaders has become one of the hottest topics in the industry. In the past year, a large number of comfortable cabs have emerged. The purpose of all this is to maximize the efficiency of equipment and drivers