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Excavators are heavy equipment used in civil engineering and surface mining. An excavator, also called a 360-degree excavator or digger, sometimes abbreviated simply to a 360, is an engineering vehicle consisting of a backhoe and cab mounted on a pivot (turntable is a more apt description) atop an undercarriage with tracks or wheels. The term excavator is sometimes used as a general term for any piece of digging equipment.

Roles of Excavators

Excavators are used in many roles:

1- Digging of trenches, holes, foundations
2- Demolition
3- General grading/landscaping
4- Heavy lift, e.g. lifting and placing of pipes
5- River dredging
6- Mining, especially, but not only open-pit mining
7- Brush cutting with hydraulic attachments

Varieties of Excavators

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.

Often the bucket can be replaced with other tools like a breaker, a grapple or an auger. Excavators are usually employed together with loaders and bulldozers. Most smaller excavators have a small backfill (or dozer-) blade. It’s a horizontal bulldozer like blade attached to the undercarriage and is used for pushing removed material back into a hole.

Examples of Excavators

1- Compact excavator

A compact hydraulic excavator is a tracked or wheeled vehicle with an approximate operating weight of 6 metric tons (13,228 lbs). It generally includes a standard backfill blade and features independent boom swing. The compact hydraulic excavator is also referred to as a mini excavator.

The compact hydraulic excavator is somewhat unique from other construction equipment in that all movement and functions of the machine are accomplished through the transfer of hydraulic fluid. The compact excavator’s work group and blade are activated by hydraulic fluid acting upon hydraulic cylinders. The excavator’s slew (rotation) and travel functions are also activated by hydraulic fluid powering hydraulic motors.

2- Dragline excavator

Dragline excavation systems are heavy equipment used in civil engineering and surface mining. In civil engineering the smaller types are used for road and port construction. The larger types are used in strip-mining operations to extract coal and these are amongst the largest mobile equipment (not water-borne), and weigh in the vinicity of 2000 metric tonnes, though specimens weighing up to 13,000 metric tonnes have also been constructed.

A dragline bucket system consists of a large bucket which is suspended from a boom (a large truss like structure). The bucket is maneuvered by means of a number of ropes and chains. The hoistrope, powered by large diesel or electric motors, supports the bucket and hoist-coupler assembly from the boom. The dragrope is used to draw the bucket assembly horizontally. By skillful maneuver of the hoist and the dragropes the bucket is controlled for various operations.

3- Bucket-wheel excavator

Bucket-wheel excavators are heavy equipment used in surface mining and civil engineering. The excavation component itself is a large rotating wheel mounted on an arm or boom. On the outer edge of the wheel is a series of scoops or buckets. As the wheel turns, the buckets remove soil or rock from the target area and carry it around to the backside of the wheel, where it falls onto a conveyor, which carries it up the arm toward the main body of the excavator. Additional conveyors then may carry it further; in some cases, several long conveyors are placed end-to-end, each supported by a large vehicular base.

Especially large bucket-wheel excavators, over 200 meters long and up to 100 meters in height, are used in German strip-mining operations, and are the largest earth-movers in the world. These tremendous machines can cost over $100 million, take 5 years to assemble, require 5 people to operate, weigh more than 13,000 tons, and have a theoretical capacity of more than 12,000m³/h. Specifically, the RB293 bucket wheel excavator manufactured by MAN Takraf is recognized by Guinness World Records as the largest land vehicle.

These days there is no need for any construction job to go ahead without the proper excavation equipment. Many excavators or other kinds of machinery can be made to do several tasks with additional attachments. Backhoe buckets can easily be replaced with other backhoe attachments such as the backhoe debris fork that attaches to the bucket and doubles as a forklift.

Excavator attachments include such things as stump grinders or splitters to get rid of those stumps from your paddocks, brush cutters for clearing brush and stirrers for mixing solid aggregate or slurry. Buckets for excavators come in various sizes, making it easy to get just the right one for your excavator.

However, before buying attachments for your backhoe or excavator, make sure that it is attachment-ready. Most manufacturers claim their machinery will accept any kind of attachments made for them, but you may need to buy different couplers, hoses, control mounts and clamps, for such attachments may vary. No use getting out on the job and finding you need another trip to town to purchase the right clamps or control valves.

However, if you can purchase those attachments that do not require any additional device to ensure they work well, then you will save a great deal on the cost and the time spent in attaching them.

Having many additional attachments for your excavators or backhoes will ensure greater flexibility and enable you to do a great many more jobs. Thus much more contracting work will become available to you as a contractor.

Some attachments fit between the main vehicle and the additional tool, enabling it to work with greater flexibility, rather like a wrist provides to the arm. When such additions are quick to attach and fit they save a great deal of time and work for the operator, enabling him to remain on schedule with the job.

A while ago I wanted to design and build my own Mini Excavator. I had many requirements before I started going through the design process. Firstly was the size, it needed to be small enough to fit through a single doorway andlight enough to be lifted into the back of a large estate car or MPV People carrier. I wanted to keep away from petrol power due to the crazy rising costs of fuel and I wanted the machine to be able to run in enclosed spaces or even indoors. I also wanted it to be much more quiet than most machines that use a engine. The machine needed to also be able to run for long periods to be able complete the job. When doing the research before setting about designing and building the machine I found out that 99% of all excavators are either petrol or diesel powered. With the engine powered machines you cant run them indoors or in enclosed areas without proper exhaust extraction. The only electric machines that are available run from a 3-phase power supply making them costly and difficult to find a suitable power source. Having a battery-powered machine was soon ruled out due to the size and weight of the batteries needed to provide enough power. Here is the result. 240-volt mains powered super micro mini excavator. This machine only is 600mm wide and only 1000mm long excluding the arm so its small enough to fit through even the smallest doorway. It also only weighs approx. 100kg so 2 people can easily lift the machine into the boot of a large estate car, mpv …

Mini excavator is used in order to dig up dirt and soil and rocks. The’re in the category of construction equipment that can be used anytime generally in most parts of the world. They drive smoothly above rough terrain and mounts inclines easily. These types of one-person machines are widely-used most commonly on construction sites, farms, and practically wherever, that needs dirt rearranged easily. They may be easy to handle as well as a kid can become a driver one with a brief quantity of instruction and practice.

Excavator machines are big business. Companies like John Deer, Kubota, and Kobelco selling them. Mini excavators are popular by business owners small and large. The intentionally solid structure is one kind of its best qualities. They can get into places that the bigger clunky machines cannot. The zero tail swing perform within their unique range of space when they roll along elongated wheels or tracks.

Buying a mini excavator may be a big investment. This is the major purchase with prices for new machines to include $30,000-$35,000 and size plays a serious factor in the worth. Expect to pay more for a larger mini excavator. With that said, a used excavator is just about $15,000 and its resale value is part of its appeal. Also apart of the appeal is their reliability. It is a powerhouse and well developed for many years of service. Safety measures may also be installed to shield the driver in the event tipping occurs on hilly areas.

New excavators is often very costly. An alternative to some new machine is buying used excavators. This is often a bargain should you find one that fits your preferences and is in good condition. Some newspapers, trade papers and magazines carry ads for these. If they’re sold by somebody, many of them don’t come with extended service agreements, inspections or financing but will not imply that they should be ignored. Not every used excavator might be in the best or worst condition. Taking it to a mechanic services these types of machines for an inspection. Before buying it, is a better way to purchase one in good condition. Less complicated way to locate a good used excavator can be to go to a dealer.

The bobcat excavator is a brand or models of the miniaturized all purpose construction, landscape and agriculture tractor. This is the larger scoop able to dig a wider trench than a number of the standard backhoes installed on standard loader backhoe machines. It has the capacity to extend deeper and dig a wider trench than the usual typical scoop loader. This may be a vital reason behind the standard double featured loader and now provides the contractor with a cheaper hardier piece of equipment.

The caterpillar excavator is also known because of its great strength and power. It to enhance to crush the earth; this proves that such bulldozer will work for rock crushing and agricultural types of work. Its ripper will be the claw-like component which is found over the rear Rippers usually are in a lone shank or groups of three or maybe more, these is proven to be as multiple shank rippers.

When buying excavator machines, there are several things to consider. Consider the needs you have and how you may use it. Know how deep you need it to dig. If you are using this machine often then the latest excavator may be the best route to buy. For more interesting article about mini excavator, do visit at http://excavatormachines.com/.

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Video of the operation of the Spider, A towable backhoe made by FCM Group

1996 CAT 307 MINI EXCAVATOR LOCATED IN SEATTLE, WA $15500.00 7000 HOURS. ARTICULATED BOOM GREAT FOR DIGGING IN FRONT OF YOUR TRACKS, RUBBER TRACKS FOR ROAD WORK. A ROCK GRAPPLE AVAILABLE FOR AN ADDITIONAL $1250.00. ALL OIL AND FILTERS INCLUDING FINALS ARE REPLACED EVERY 250HRS Call 206-255-1243 and ask for Tom if you are interested. Email tom@frontierconstructioninc.com