Hey guys my name is Jason with Mount Baker Mining and Metals and today I wanted to
give you a pretty comprehensive walkthrough of our hammer mills. And
these by far are have the most diverse applications out of any of our equipment
so I wanted to give you a walk through, talk about some of those features and
show you guys kind of how we build them in some of the parts we use. So this is a
sixteen by twelve hammer mill and we'll give you a walk through this one and
then we'll take a look at some of our bigger machines. So this is rated at one
ton per hour of gold ore, and that's kind of how we rate our hammer Mills. This
mill is equipped with a gooseneck Inlet so you can take larger material or
bigger samples. And it's important that you don't have a line of sight and
that's what we've done here with this gooseneck is there's no line of sight
direct out of the hammer mill so you can't have stuff coming back and
come back at the operator. This is set up and we have a discharge chute here that
we can orient either way so it can come out either side of the mill depending on
what the customer needs. And this mill has 20 hammers in it, four rows of five
hammers. There's a screen, just like in our larger mills, that wraps all the way
down along the bottom of the mill and it's held in by the armor. And I have
another video that I'll post a link to in the description showing how to
change the screen and the inside of a hammer mill, but you loosen the armor and
then the screen rolls out and you can roll a new screen back in and bolt the
armor down to hold the screen in, there's no welding or clamping or anything like
that it's all held in by the armor and the lid. So a lot of people ask about the
wear and the maintenance of our hammer mills, and so let's start out with with
the greasing. So there are two bearings one on each
side and they just need to be greased about once every day or two depending on
your operation. You don't need grease using out of the
bearing just enough to keep the seal and the dirt and the grime out of the
bearing. The high wear parts on a hammer mill are inside the case, and that's the
hammers, the screen, and the armor. And those three pieces are really the the
only items that we're consistently on a hammer mill as long as you keep those
replaced and up-to-date that's really the only wear on the machine. And so the
armor is bolted in by these bolts here, we have pretty much
the whole inside of the case covered in armor and it's an AR 400 high abrasion
resistant steel armor that's 3/8 thick. Our hammers are high chrome or high
manganese depending on your application, and the screens are either AR 400 steel
or the thicker ones used primarily for scrap metal in our larger HD 24 by 16
hammer mills or a one-inch thick steel plate that we break into the contour
that needs to get into the mill. So that's kind of a rundown on the hammer
mill wear. We estimate that really no matter the size of the hammer mill when
running gold or the cost of hammer mill maintenance is about 15 to 20 dollars a
ton. And so that that really is again independent of the throughput of the
hammer mill, that's about how much the maintenance cost. And we tell our
customers that about once a week you should open up the case of the hammer
mill, look, see if you need to replace any of the parts see how the hammer wear is
doing. The last thing you want to do is run the hammer mill so so hard that the
armor wears through and it wears through the case which we've actually had a
couple customers do. So just keep an eye on your hair mill, check it once a week,
depending on the application that you're you're doing with the mill your wear may
be higher or may be lower it just depends on the material you're running. This is
one of our 24 by 16 hammer mills, and we actually have three different types of
hammer mills, we have a 16 by 12 hammer mill that will run about 1 ton of ore in
an hour, we have the 24 by 16 that will run an estimated 2 tons of ore in an
hour, and then we also have a 24 by 16 heavy duty scrap mill. And I wanted to
walk you through each one of those and tell you about some of the features of
them, but let's start here with this 24 by 16. This is an ore Inlet, and this
is basically for any small material below 2 inches in size. You get this
inlet, and this is designed to take the feed from the conveyor belt and so on
our turnkey systems a conveyor belt will feed in and feed the ore directly into
the hammer mill. This mill has four rows of hammers when running ore or glass
or anything brittle like that. They're a high chrome, about 20% chrome, for a high
wear situation and then there's a screen that wraps all the way along the bottom
of the mill for 180 degrees and you can base the screen size on the discharge
that you want the ore or the material are running to come out at. And so we
have screens that go down all the way to a point eight millimeter and up to a two
inch by three inch hole and we can really customize any screen that you
need because we cut them and we make them all here in our shop. This
particular mill is run with a 30 horse tico westinghouse electric motor and it
can be wired to fit any voltage or frequency that's required. We do a lot of
business internationally and so a lot of our customers will have 50 Hertz or 380
volts, and so we we've adopted a motor that can take all voltage and
frequencies. The hammer mill is also run with three belts and between the belts,
the bearings, the hammers, the screens, the internal armor of the hammer mill, we
keep all of these parts in stock for a quick turnaround and so if you ever need
replacement parts it's really as you can give us a call or email and we can get
your parts to you in a very quick fashion.
So we currently don't have any HD hammer mills that are finished, but we do have a
lot of parts done so I wanted to show you some of the cases that we that we
make. And these are made all in the USA all of our hammer mills are made here in
our shop, we cut out the parts on our table and weld them all together but
these are the 24 by 16 HD mills. And these are primarily used for more
heavy-duty applications such as scrap metal where the machine takes a little
bit more of a beating. And so we've increased the strength of our cases with
ribs here on the back where most of the impact is, and ribs across the top as
well. The shaft that goes through the hammer mill is a three inch shaft and we
use heavy-duty double spherical roller bearings on this larger capacity mill.
The case is 3/8 inch thick, and unlike our standard 24 by 16 some of
the armored plates in this one are 3/4 inch thick AR 400 to really take that
beating as some of the scrap metal and and the heavier duty applications. So the
armor, the hammers, and everything in this mill is very easy replaceable just like
on our standard mills, but I wanted to clarify that the wear rate typically on
the scrap metal mills or these heavier duty mills are actually less than on our
ore systems because in our or systems you're grinding quartz or something
that's very high abrasive and you're grinding it down to a very fine powder.
Whereas with these heavy-duty hammer mills it's more of an impacting and then
it'll go through the screen fairly quickly so you're not actually grinding
anything. So the wear rate and the cost of running a hammer mill the maintenance
on this mill is quite a bit less than than our gold ore or some of those higher
abrasion environments that some of our standard mills get put through. So these
are our 1-inch slotted screens and these are one-inch thick steel. And these are
typically used in our HD hammer mills for scrap metal. And at the 1-inch or
actually here's a half inch one, these have performed really well for us for
transformer or small motor recycling to liberate the steel from the copper and
then the copper and steel can go under a magnetic cross belt to pull
the steel out and the copper comes out fairly clean. So here's some screens we
have in inventory that I want to walk you through. You've seen our larger 1
inch thick screens that typically have much larger holes. These ones here in
front are 3/8 AR 400 that we laser cut or plows cut the slots in and these
are used for or or glass or bone shells things like that that needs to be ground
up very very fine. These screens are all 24 by 16 hammer mill screens, here's
another one that's a quarter inch punch plate we use for our PCB recycling
system. But again you can see that we can pretty much custom make any screen that
you need for whatever application. This is a two inch by three inch hole
that we've cut in our screen and this one is especially useful for much larger
or bulkier items that need to be just crushed and discharged at a fairly large
size. And so right now this is currently one of the larger holes we make we have
made holes larger but this is one of our standard two inch by three inch screens
for that scrap metal application. So this is the inside of one of our 24 by 16
hammer mills and I wanted to show you the rotor in here and how this works.
These are the pins that hold the hammers and this is an inventory mill and so we
haven't actually put the hammers in because we don't know what the
application is going to be. But the hammers hang on these pins here and the
pins are held in place by two steel plates on the outside. And these plates
bolt through the rotor and so the pins are captured, they can't move left or
right and so those plates make it really easy to change the pins and the hammers.
This mill again has four rows of six hammers so there's 24 hammers in total
. And the rotor spins around at about 1200 rpm. And I wanted to talk about the armor
a little bit, this is a 3/8 AR 400 armor and you can see that there's plates all
along the mill all over the inside. And I want to talk about the bolting mechanism
here, these are carriage bolts and they have a little square head under this
button and so you can loosen and remove the bolts without accessing the
inside of the mill. So you can loosen all the bolts we use nighloks here on the
outside of the case to make sure they don't come loose during operation but
you can take an air gun or a ratchet and remove the nut completely without
accessing the inside of the case. So I wanted to walk you through the three
different types of hammers we use in our hammer mills and the different
applications for each. And so let's start with this one, this is a high chrome it's
20% chrome it's cast here in the States and this is a very
very high wear-resistant hammer. And so we use it for our gold ore, glass
recycling, that kind of thing, anything where the it's a real high abrasion
environment this is a great hammer for that application. the hammer hangs on the
pin here and the hammer length makes it so that in the 24 by 16 or the 16 by 12
hammer mill, this hammer comes about a quarter inch away from the screen in the
case and so you have a very close tolerance hammer going around in the
hammer mill very fast and it's able to make a very very fine powder. This hammer is a
high manganese content cast hammer and this is more applicable for our scrap
metal applications because as this hammer is impacted, the manganese
actually causes it to work harden and the Burnell strength goes up to about
600 as the hammer work hardens This hammer is a little bit shorter than our
chrome hammer to give a larger area between the hammer mill case or screen
and the hammer to allow larger items such as small motors or transformers to
go into the hammer mill and with those larger screen sizes the hammer doesn't
need to come nearly as close to the case. This last hammer is a little bit unique,
it's a blade that we've made and we've cut it out of 3/8 AR 400, the same stuff
we use for our armor in our hammer mills. And we found that this is great for
grinding up PC boards, copper wire, anything that needs, granulator chops,
anything that needs kind of a tearing or a grabbing motion, anything you're trying
to shred this is more of a shredding hammer. And as you saw in the mill
earlier, we use two hammers per or two blades per one slot on the hammer mill
so every spot you put one hammer we actually put two of these blades. Again
it hangs off the pin here and the length of the hammer it makes it come very very
close to the inside of the hammer mill on the screen and which helps grind the
material up very very fine. So those are the three different types of hammers we
used in our hammer mill and pretty much we can
use them for any application depending on what you guys are trying to grind up.
So I hope you guys enjoyed learning a little bit more about our hammer mills
we make, how we make them and some of the applications that they get used for. If
you have any questions or comments please let me know you can find our
email address and phone number in the description below. So thanks for watching
and we'll see on the next video.