What is a Bulldozer?

Bulldozer is an earth-moving engineering machine capable of excavating, transporting, and abandoning rock and soil. It is widely used in open-pit mines. For example, it is used to build dumping grounds, leveling automobile dumping grounds, stacking scattered ore rocks, leveling work pans and building sites. It is used not only for auxiliary work, but also for main mining work. For example: stripping and mining of sand deposits, traction and boosting of scrapers and plows, and other earthmoving machinery to reduce the stripping step height when there is no transportation mining method. ^[1]

Mainly are general-purpose bulldozers, wetland-type bulldozers, and prototype bulldozers suitable for western development. After more than 20 years of steady development, China's bulldozer industry has now formed from the 59kW (80 horsepower, Shantui SD08 bulldozer, at 5.12

Bulldozer is a kind of main machinery of earthmoving engineering machinery. It is divided into two types of crawler and tire according to the walking way. Because there are fewer tire bulldozers. This article mainly describes the structure and working principle of crawler bulldozers. The basic operations of bulldozer excavation are: A. soil shovel B. soil transportation C. unloading soil.

Of the crawler bulldozers with a power greater than 120KW, most use hydraulic-mechanical transmission. This type of bulldozer comes from the introduction of Japan

Bulldozers use mechanical transmission or hydraulic mechanical transmission systems with torque converters. A few also use hydraulic transmission systems.

I. Humanized Design

The appearance of the bulldozer produced in China and the layout of the driver's cab are still far behind the advanced countries in the world. This has little to do with the competition in China's bulldozer industry. In view of China's accession to the WTO and the gradual elimination of trade barriers for foreign equipment, we must align with advanced foreign companies and pay great attention to the appearance of our products and the comfort of the interior of the cab. The operating system is gradually approaching the excavator and automobile industries to reduce the labor intensity of the driver. The instrument and meter adopts three-level alarm electronic monitoring device and automatic fault diagnosis device. The cabin adopts a closed, air-conditioned cab with an air filter device, and adds advanced electronic equipment such as recorders and even DVDs to maximize the humanity of the driver. Requirements.

Application of energy saving technology

1. The hydraulic system of the working device adopts fixed differential overflow technology. In this way, when the directional valve of the working device is in a small opening throttle speed adjustment process, the excess oil supply from the oil pump can be returned to the oil tank directly from the differential pressure valve without going through the safety valve, so that the system pressure during the speed adjustment process is only higher than the working pressure High certain value P to reduce hydraulic pressure

1.Main clutch slips

When the bulldozer main clutch slips,

First, the development of small bulldozers

In addition to the need for large and medium horsepower bulldozers for expressway construction, the construction of high-grade highways and county-country-level highway networks and the construction of water conservancy projects and environmental protection projects are bound to create a large number of individual constructors. In this way, the demand for small bulldozers (under 100 horsepower) must increase. At the same time, China's built expressways and high-grade highways have gradually entered the maintenance period. With the economic development of the eastern coastal areas and the improvement of people's living standards, small bulldozers will gradually become a tool for people to replace manual labor. This is the market for small bulldozers.

Compared with the North American, Western European, and Japanese markets, the Chinese small bulldozer market has a considerable gap in terms of sales volume and the proportion of small bulldozers and heavy bulldozers in total sales. The bulldozer industry must take this opportunity to work hard to meet the needs of this new market. According to related magazines, the minicomputer market has entered a growth period, from 2008 to 2012, it has entered the late growth period and early maturity period, and around 2020, it has entered the mature period.

Therefore, the relevant enterprises of the bulldozer industry should focus on the strategic point of view, and must not ignore the future market of small products. However, the development of small construction machinery products in developing countries like China must be accurate. Different technologies and different user groups should be used to solve the problem of positioning accuracy. Should first develop low-end products that meet the vast rural market in developed regions. And high-end products should consider the needs of future users more.

2. Operations in the Western Plateau

Improve and solve key technologies that adapt to the operation of the western plateau as soon as possible

1.Power recovery technology

As a general naturally aspirated engine, when the altitude increases by 1000m, the output power will decrease by 8-12%. When the whole machine operates at an altitude of 4000m, its output power is only about 55% in the plain area. Therefore, the bulldozers used in the construction of the western plateau area must use this power recovery type supercharging technology, so that when the diesel engine is used in the plateau area, its output power, economic indicators and heat load indicators are restored to the original low-altitude areas in the east. Level. National diesel engine supporting manufacturers of bulldozers, such as Shanghai Diesel Engine Factory,

DLJS 2-2-1981 Volume 2 Bulldozers for Construction Machinery Safety Technical Operation

GB / T 19928-2005 Lifting capacity of earthmoving machinery pipelayers and tire bulldozers or loaders with side arms

GB / T 21937-2008 Earthmoving machinery crawler and tire bulldozer capacity calibration

GB / T 21940-2008 Main shapes and basic dimensions of earthmoving machinery blades for bulldozers, graders and scrapers

GB / T 8590-2001 Bulldozer terminology

GJB 1639-1993 specifications for military bulldozers

GJB 81A-1994 Military Bulldozer Design and Test

JB / T 10763-2007 Technical specifications of blades for bulldozers, scrapers and graders

JB / T 11009-2010 Bolt for driving gear tooth block of crawler bulldozer

JB / T 11010-2010 track bulldozer nut for track and gear block

JB / T 11011-2010 Track bulldozer driving gear tooth block

JB / T 1666-1997 Test method for crawler bulldozer

JB / T 2784-1979 Crawler Dozer Model and Basic Parameters

JB / T 2983.1-1998 track roller bulldozer track roller

JB / T 2983.2-2001 track bulldozer guide wheel

JB / T 2984.1-2001 crawler bulldozer sprocket

JB / T 50091-1997 Tire Bulldozer Reliability Test Method (Internal Use)

JB / T 51007-1992 Reliability test method, failure classification and evaluation of crawler bulldozer

JB / T 5932.1-1991 Covered Bulldozer Sealed Covered Tape Assembly

JB / T 5932.2-1991 Covered Bulldozer Sealed Covered Chain Link

JB / T 5932.3-1991 Laminated Bulldozer Sealed Laminated Laminated Cover Plate

JB / T 5932.4-1991 Covered Bulldozer Sealed Covered Pins and Pin Sleeve

JB / T 5932.5-1991 Covered Dozer Covered Bolt

JB / T 5960-1991 Covered wetland bulldozer technical conditions

JB / T 5961-2007 The size and arrangement of the angle blade hole of the bulldozer

JB / T 6033-2007 Test method for thermal balance performance of crawler bulldozer

JB / T 6036-2007 Test method for watertightness of crawler bulldozers

JB / T 6039.1-1992 Technical specifications of high prototype crawler bulldozer

JB / T 6039.2-1992 High Prototype Tracked Dozer Model Test Method

JB / T 7151-2007 Test method for loosening operation of crawler bulldozer

JB / T 7153.1-1993 basic parameters of tire bulldozer

JB / T 7153.2-1993 technical specifications of tire bulldozer

JB / T 7153.3-1993 Tyre type test method

JB / T 7305-1994 Technical conditions of transfer case for bulldozer

JB / T 7306-1994 Technical conditions of crawler bulldozer

JB / T 7312-2010 track shoe for wetland bulldozer

JB / T 8409-2010 universal joint of crawler bulldozer

JB / T 8813-2010 Tracked bulldozer steering brake belt

JB / T 8814-2010 Technical conditions of water-cooled hydraulic oil cooler for high-power bulldozer

JB / T 8846.1-2001 Technical requirements for wet steering clutch of crawler bulldozer

JB / T 8846.2-2001 Technical requirements for dry steering clutch of crawler bulldozer

SLJJ 1-2-1981 Volume 2 Bulldozers for Construction Machinery Safety Technical Operation

SN / T 1081-2002 Inspection rules for bulldozers for export engineering machinery ^[2]