Loading the lesson
Loading the lesson
Search AllRounder.ai
Search the courses, subjects, tracks, games and features, or jump straight to a page.
Search the courses, subjects, tracks, games and features, or jump straight to a page.
Learn it your way
A short class with Sarah and her students. The other ways are under More.
Sign up free to listen. Transcripts are free to read.
Welcome, everyone! Today we will delve into the balancing of scraper and pusher operations. Can anyone tell me why it's essential to balance these operations?
Is it to ensure that one machine doesn't wait for the other?
Exactly! The efficiency of one relies on the other, especially during the loading phase. This way, we can minimize idle time and maximize productivity.
What determines when a scraper needs the pusher?
Great question! The scraper primarily requires assistive help during loading. Once the scraper bowl is full, it can operate independently.
So, how do we calculate how many scrapers one pusher can serve?
We use the cycle time of the scraper divided by the cycle time of the pusher. Let's remember the acronym BUMP, for 'Balancing Using Machine Performance'!
BUMP? I like that! It makes it easier to remember.
Now, let’s break down the cycle times. The scraper cycle time is impacted by loading, dumping, and travel time. Does anyone remember the components?
I think it includes average loading time and average dumping time?
Yes! Also, the turn time and any time spent moving in the cut area. Remember the mnemonic 'LOAD', which stands for Loading, Output, and Dumptime!
What about the pusher cycle time?
The pusher cycle time is generally shorter and calculated using specific formulas. We should always consider variations based on operational conditions.
To optimize productivity, we must determine the balanced number of scrapers per pusher. What happens when we have too many scrapers?
The scrapers might have to wait for the pusher, creating delays.
Exactly! Conversely, not having enough scrapers means the pusher's work goes to waste. We can calculate the balance using the formula: N = Ts / Tp, where Ts is the scraper cycle time and Tp is the pusher cycle time.
And if we get 5.68, do we round down or up?
Good detail! We can either round down to 5 or round up to 6, but we must assess productivity implications in both cases.
Let’s now talk about the economic side of operations. Why would we want to compare the productivity of using 5 or 6 scrapers?
To see which setup minimizes costs while maximizing efficiency?
Exactly! Conducting an economic analysis assists us in making informed decisions. Remember the acronym TRAC - Total Return on Asset Considerations!
TRAC makes it memorable too! Sounds like a strategy.
Can we always find that optimal number?
Not always, as it varies by project. Continuous evaluation is key to achieving balance and optimal productivity.
The time required to complete one full cycle of scraper and pusher operations.
Refers to how scrapers and pushers depend on each other for efficient operation during loading.
The act of determining the optimal number of scrapers and pushers based on their cycle times.
To balance scrapers and pushers alike, avoid idle waits and keep the cycle tight.
Imagine a construction site where scrapers are waiting for pushers to load material. When balanced, scrapers efficiently fill their bowls while pushers assist seamlessly, creating a workflow rhythm like dancers.
Remember RICS: 'Reduced Idle, Continuous Scraping' for balancing machines effectively.
BUMP: Balancing Using Machine Performance—use this to remember what to consider when optimizing scraper and pusher operations.
Term
Cycle Time
Click to flip
Term
Balancing Operations
Click to flip
The total time taken to complete one cycle of operation, including all phases from loading to unloading.
A type of earth-moving equipment used to load and transport bulk materials.
A tractor used to assist scrapers, helping to push material and reduce loading time.
A state of optimal operation where the number of scrapers and pushers minimizes idle time.
A measure of the expansion of material from its bank volume to loose volume, crucial in calculating load capacities.
This section explains the significance of balancing scraper and pusher operations to optimize productivity in earth-moving operations.
The section discusses the detailed relationship and cycle times between scrapers and pushers, emphasizing the need for balancing their operations. Key concepts include the estimation of cycle times, the interdependency of machines, and strategies for maximizing efficiency through balanced operations.
In this section, we explore the intricate relationship between scrapers and pushers in earth-moving projects. It begins with an explanation of the cycle times for both machines and highlights the need for balance due to their interdependence during loading phases. The balanced number of scrapers per pusher is crucial for minimizing waiting time and maximizing productivity. We derive the formula for calculating the number of scrapers served by a single pusher and examine the factors affecting cycle times, such as loading, dumping, and travel times. The section concludes by discussing the economic implications of choosing between different numbers of scrapers to achieve optimal operation levels. Balancing these operations is essential for increasing effectiveness, reducing costs, and ensuring streamlined workflow.