In the world of Haul truck, there are endless aspects to explore, discover and analyze. From its origins to its evolution today, Haul truck has been the subject of interest for many scholars, researchers and enthusiasts. Knowing more about Haul truck allows us to better understand its influence in various areas of society, as well as its impact on daily life. In this article, we will delve into the fascinating world of Haul truck, exploring its many facets and delving into its relevance in the current context.
Haul trucks are off-road, heavy-duty dump trucks specifically engineered for use in high-production mining and exceptionally demanding construction environments. Most are dual axle; at least two examples of tri-axles were made in the 1970s. Haul trucks are denominated by their payload capacity, by weight (variously in tons, tonnes, and kg).
Most haul trucks have a two-axle design, but two well-known models from the 1970s, the 350T Terex Titan and 235T WABCO 3200/B, had three axles. Haul truck capacities range from 40 short tons (36.3 t; 35.7 long tons) to nearly 500 short tons (454 t; 446 long tons).
An example on the smaller end is the Caterpillar 775 (rated at 70 short tons ). Quarry operations (which produce payloads that have value) are typically employ smaller trucks[why?] than mining operations (such as removing undesirable overburden, an expense).[citation needed]
Haul trucks can generally be distinguished from standard dump trucks by:
Most large haul trucks use some form of traction motors coupled to regenerative brakings for power, braking, or both.
Haul trucks are classified by:
The largest, highest-payload-capacity haul trucks are referred to as ultra class trucks. The ultra class includes all haul trucks with a payload capacity of 300 short tons (270 long tons) or greater. As of October 2013, the BelAZ 75710 has the highest payload capacity, 450 metric tons (440 long tons; 500 short tons).
A rear-eject configuration is an alternative haul truck body style. Instead of lifting the bed vertically, the hydraulic cylinder pushes a ram-face horizontally through the body to eject the hauled load.
Rear-eject dump vehicles were first introduced in the 1980s by LeRoy Hagenbuch, P.E. of Philippi-Hagenbuch, Inc., for a refuse hauling application in New York City. They were designed to work on Volvo BM truck chassis. While the functionality of the ejector bodies worked well, they were prone to maintenance issues and were not replicated until the 1990s.[citation needed] The next documented ejector bodies were developed by DDT, a UK truck manufacturer. A variation using steel chains instead of a hydraulic ram was introduced by Bell, but did not become popular.
Caterpillar Inc. began offering a rear-eject option using technology originally designed for its scrapers after one of its contractors successfully converted a few CAT D400 models. The new design, installed on the company's D400E model, was less likely to jam in cold weather. CAT later began manufacturing a standard R.E. body for its 730, 740, and 740B articulating haul-truck series.
Philippi-Hagenbuch, a company specializing in truck body design, developed its own mechanism for its rear-eject bodies, and has patented its design in the US, Europe, and Australia. The company customizes Rear-Eject bodies or trailers for several manufacturers' off-highway vehicles; including both rigid and articulating varieties.
As of 2014 Caterpillar Inc. and Philippi-Hagenbuch, Inc. are continuing to manufacture Rear-Eject bodies for off-highway applications, each using its own design of mechanism.
There are both advantages and disadvantages to a rear-eject truck:
Pros
Cons
This section needs expansion with: disadvantages of rear-eject versus end-dump trucks. You can help by adding to it. (February 2024) |
image | model | manufacturer | first model |
number built |
capacity | propulsion type | notes |
---|---|---|---|---|---|---|---|
BelAZ 75710 | BelAZ | 2013 | 496 short tons (443 long tons) | diesel-electric |
Employs 8 tires, on two axles, with all-wheel drive, and all-wheel steering. | ||
Liebherr T 282B | Liebherr | 2004 | 400 short tons (360 long tons) | diesel-electric | |||
Bucyrus MT6300AC | Bucyrus International | 2008 | 400 short tons (360 long tons) | diesel-electric |
Firm was acquired by Caterpillar in 2010. | ||
Caterpillar 797 | Caterpillar | 1997 | 360 short tons (320 long tons) | diesel-mechanical | The 797F model has an increased capacity of 400 short tons. | ||
Komatsu 960E-1 | Komatsu America Corp. | 2008 | 360 short tons (320 long tons) | diesel-electric | |||
Belaz 75600 | BelAZ | 2005 | 350 short tons (310 long tons) | diesel-electric | |||
Terex 33-19 "Titan" | General Motors Diesel Division | 1973 | 1 | 350 short tons (310 long tons) | diesel-electric | Prototype, only 1 built | |
Komatsu 930E | Komatsu America Corp. | 1995 | 2,100 | 320 short tons (290 long tons) | diesel-electric | Number built as of September, 2018 |
The ultra-hauler class includes trucks with a capacity rating of 300 tons and above.
Developed specifically for high production mining and heavy-duty construction applications ...