Selecting the right concrete pulverizer for your mobile crushing operation
Concrete pulverizer guide
More crusher throughput and less wear.
Less downtime due to material bridging and rebar getting caught up.
Uncrushables if undedected can seriously damage your machine.
Without a concrete pulverizer or hydraulic hammer you...
A concrete pulverizer is an attachment for your excavator that will break the concrete into small pieces and cut through the embedded rebar, allowing the concrete to fall to the ground rather than hang onto the rebar. It consists of a stationary jaw and moveable jaw. This allows operator to pick up concrete slabs, walls, and bridge deck to crush them through compression. There are 2 main concrete pulverizer types - a mechanical pulverizer and a hydraulic pulverizer.
When selecting a concrete pulverizer you need to look at the following parameters
|➕ Simple design||➕ Bigger breaking force|
|➕ Good for flatwork||➕ Replaceable teeth (vs hardfacing)|
|➕ Low cost||➕ Cutting tool for rebar|
|➕ No additional plumbing required||➖ Additional plumbing required|
|➖ Less breaking force||➖ Higher cost|
|➖ Hardfacing of teeth required|
|➖ Unusual stress on the cylinder|
|➖ Hardfaced teeth will wear faster|
A rotating function is not necessary to preprocess concrete. It adds cost but not benefit as your material that you need to process is right in front of you.
Yes, hydraulic hammers are also suited to preprocess concrete for crushing. However, it is a much longer and more tedious process to sort and prep a large concrete pile. If you crush concrete constantly, a hydraulic pulverizer is worth the investment, Hammers are more suited for demolition and breaking hard rock than sorting through a concrete pile.
No matter if you run a jaw crusher or impact crusher - if it doesn't fit it will stop your production and you start losing money.
For instance, if an oversize concrete slab gets wedged in before the crusher inlet and you spend 15 min to resolve the issue. Your crush on average at a 160 TPH. A 15 minute downtime means you are losing 40 tons of material. Assuming your material price is $8 per ton this equates to a $320 loss in 15 minutes. Additionally, your crusher, your excavator, and your stacking conveyor are ideling.
While you prepare a concrete pile with a concrete pulverizer you downsize you material and liberate rebar. Rebar and any uncrushable objects can be set aside. The cutting tool on your hydraulic pulverizer helps you to cut long strands of rebar.
"If rebar is too long it will build a bird's nest in your crusher!"
Crusher feed size depends on the crusher type and material hardness. Generally, speaking you want to pulverize concrete to a size where it is very unlikely to bridge up in front of the crusher because interruptions cost you money.
"As a rule of thumb: the feed size should be 80% of your crusher inlet opening."
While prepping the material you can set uncrushables aside for further processing. This could require a hoe ram to break big pieces or cutting long strands of rebar with the cutting tool of your hydraulic pulverizer.
"As a rule of thumb: the rebar should be encapsulated in the concrete and shouldn't stick out longer than 4 ft to avoid any blockages."
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