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11:25 Dec 12, 2010
This question was closed without grading. Reason: Answer found elsewhere

English to English translations [PRO]
Tech/Engineering - Mechanics / Mech Engineering / mining equipment
English term or phrase: crowd brake
Context:
"For example, the ... machines do not have a crowd brake."
Can you find me a definition of "crowd brake"? What is it for?
Tsogt Gombosuren
Canada
Local time: 07:04
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Summary of answers provided
5the "crowd brake" stops the crowd rope take-up mechanism
airmailrpl
4brake for the boom engine aka crowd engine
Stephanie Ezrol


Discussion entries: 8





  

Answers


12 hrs   confidence: Answerer confidence 5/5
the "crowd brake" stops the crowd rope take-up mechanism


Explanation:
the "crowd brake" stops the crowd rope take-up mechanism

I have no idea why it is called "crowd"

ELECTRIC MINING SHOVEL SADDLE BLOCK ASSEMBLY WITH ADJUSTABLE WEAR ...
... thus causing the handle and racking to crowd and retract from the boom. ... 1 is a side elevational view of a power shovel embodying the present ...
www.faqs.org/patents/app/20090067972 -

“It’s an intuitive control,” Wright said. The drives understand by the way the operator pulls on the stick that he wants to fill the dipper and it fills the dipper based on the summation of the operator’s input and the drives programming. It understands that, yes, the operator might be telling me to continue to crowd, but it knows it will stall soon. So it lets off, to keep the dipper moving through the bank. It’s not completely autonomous. If the operator lets go of the stick, it would stop.”.....

Matching hoist, crowd, and swing is critical to having a smooth machine. “If you can hoist really fast, but swings take twice as long, there is no benefit,” Casson said. “All of the motions have to be balanced with what the shovel is digging and trucks being loaded.”....

With the analog system, the crowd was real slow compared to the hoist speed, ....

“On a shovel, when the operator hoists and crowds, he might have it full on, but the digital drives know what kind of current it takes to go through the bank,” ...

“When the operator hoists the dipper through the bank, the shovel will crowd itself to keep a full load in the bucket,” Casson said....

http://www.e-mj.com/index.php/features/673-surface-mining-sm...

airmailrpl
Brazil
Local time: 12:04
Works in field
Native speaker of: Native in EnglishEnglish, Native in PortuguesePortuguese
PRO pts in category: 92
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1 day 4 hrs   confidence: Answerer confidence 4/5Answerer confidence 4/5
brake for the boom engine aka crowd engine


Explanation:
Crowd is used as a verb in the mining industry to describe one of the actions of a powered shovel: " 'crowd' to thrust the dipper in and out."

The following text describes this action. The action, if powered by a separate engine - requires a brake that is called a crowd brake, and the assembly for that engine is also know as crowd assembly.

Other types of machinery also have crowd engines/crowd brakes.

"There are three engines on the machine.
The reversible hoisting engine is a double-cylinder horizontal type with a 12 inch bore and a 16 inch stroke and is the largest engine on the shovel. It is located inside the engine house
and propels the machine forward or backward by chains connected to the axels.
...
The second engine has an 8 inch bore and is called the swing engine. It manipulates the boom from side to side and is attached to a chain around the swing circle.
The third engine is the boom engine (also called the crowd engine) and is mounted on the boom. It has an 8 inch bore and raises and lowers the bucket (or dipper).

... The steam shovel, invented in the United States in 1835, was originally designed to excavate earth. The first efficient single-bucket excavator was the Crane Excavator designed in
1836 by William S. Otis, but very few of these machines were manufactured. There were three basic movements that had to be powered by the steam engine. First there was the "hoist" for the
dipper; then the "crowd" to thrust the dipper in and out; and "travel" which moved the entire machine. The Otis machine accomplished all three of these movements from one single-cylinder, non-reversing engine. Many improvements would be made to make the early shovel strong enough to handle rock.
Eventually, three sets of independent engines, and a locomotive-type boiler replaced the Otis style design. As the machines became heavier it was necessary to transport them from place
to place and they were mounted on railroad trucks."

http://www.nps.gov/nr/publications/sample_nominations/Marion...

Stephanie Ezrol
United States
Local time: 09:04
Native speaker of: Native in EnglishEnglish
PRO pts in category: 6
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Changes made by editors
Dec 12, 2010 - Changes made by Tony M:
Field (write-in)(none) » mining equipment


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