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A typical modern excavator:a CAT 325C, fitted with quick coupler and tilting bucket
An excavator is an engineering vehicle consisting of an articulated arm (boom, stick), bucket and cab mounted on a pivot (a rotating platform, like a Lazy Susan) atop an undercarriage with tracks or wheels. Their design is a natural progression from the steam shovel.
Contents
1 Usage
2 Configurations
3 Excavator attachments
4 Terminology
5 Education
6 The excavating technology of Mars rovers
7 Gallery
8 Major manufacturers
9 See also
9.1 Types of excavator
9.2 Other
10 Reference and foot notes
11 External links
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Usage
Excavator demolishing a house. Note the hydraulic thumb
Excavators are used in many ways:
Digging of trenches, holes, foundations
Material handling
Brush cutting with hydraulic attachments
Demolition
General grading/landscaping
Heavy lift, e.g. lifting and placing of pipes
Mining, especially, but not only open-pit mining
River dredging
Driving piles, in conjunction with a Pile Driver
Taking out mega laches
Configurations
Excavators come in a wide variety of sizes. The smaller ones are called a mini-excavator or compact excavator. One manufacturer’s largest model weighs 84,980 kg (187,360 lb) and has a maximum bucket size of 4.5 m3 (5.9 yd3). The same manufacturer’s smallest mini-excavator weighs 1470 kg (3240 lb), has a maximum bucket size of 0.036 m3 (0.048 yd3) and the width of its tracks can be adjusted to 89 cm (35 inches). Another company makes a mini excavator that will fit through a doorway with tracks that can be adjusted to only 70 cm (28 inches) wide.
Excavator attachments
In recent years, hydraulic excavator capabilities have expanded far beyond excavation tasks with buckets. With the advent of hydraulic powered attachments such as a breaker, a grapple or an auger, the excavator is frequently used in many applications other than excavation. Many excavators feature quick-attach mounting systems for simplified attachment mounting, increasing the machine’s utilization on the jobsite. Excavators are usually employed together with loaders and bulldozers. Most wheeled versions, and smaller, compact excavators have a small backfill (or dozer-) blade. This is a horizontal bulldozer-like blade attached to the undercarriage and is used for pushing removed material back into a hole. Prior to the 1990s, all excavators had a hang over, or “conventional” counterweight that hung off the rear of the machine to provide more digging force and lifting capacity. This became a nuisance in tight turn areas – the machine could not swing the second half of its cycle due to restricted turn radius. In the early 1990s The Komatsu Engineering Company launched a new concept excavator line that did away with the “conventional” counterweight design, and so started building the world’s first tight tail swing excavators (PC128.PC138,PC228,PC308). These machines are now widely used though out the world.
An excavator with sheep’s foot compactor attachment
Excavator with a hydraulic thumb attachment
Excavator with a pulverizer attachment
And excavator with a hammer attachment in a rock quarry
Terminology
Excavators are also called diggers and 360-degree excavators, sometimes abbreviated simply to a 360. Tracked excavators are sometimes called trackhoes by analogy to the backhoe. Even though the ‘back’ in backhoe refers to the action of the bucket (which pulls “back” toward the machine) and not the location of the shovel, excavators are also occasionally referred to as fronthoes or even just “hoes”.
In the UK, wheeled excavators are sometimes known as ‘Rubber ducks’.[1]
This section may require cleanup to meet Wikipedia’s quality standards. Please improve this section if you can. (September 2008)
In Japan, the alias Yumbo (??? ,Yunbo?) is a more popular name for excavators. In 1954 after the patent right was obtained from Italy, the French company SICAM produced an excavator model Yumbo S25 . SICAM licensed this technology to many companies, such as Drott in United States, Priestman in UK, and Mitsubishi in Japan and other countries in the early 1960s.[2] The first excavator from Mitsubishi using this technology was named Yumbo Y35 which was aimed for the international market in 1961. Since then, Yumbo has become the popular name and de facto standard in Japan because of its use in Classified ads even though this is not the formal name there.
Education
The National Association of Heavy Equipment Training Schools (NAHETS), established 2002, uses excavator training schools and curriculum as a method to test and train users in the ability of excavator use.
The excavating technology of Mars rovers
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