Single Toggle Jaw Crusher
These kinds of crushers are the primary crushers with well-proven designs for crushing of rocks and minerals
in different sizes. Size of Jaw crushers is determined by feed opening at the top of the machine. This crusher
reduces the feeding minerals by pressure. "V" shaped Fixed Jaw Plate is located on a fixed surface, and the
moving jaw plate hits the rocks by the forces of toggle.
The distance between fixed and moving jaw plates, determines the discharge opening jaw or maximum size
of outputs ofjaw. Input rocks remain in the crushing chamber until fitting the size of opening ofjaw. Discharge
opening is adjustable and movement of feeding is easy. Accurate design of angle between fixed jaw plate and
moving jaw plate make it easy to crush the feed material and does not let the material to throw up.
Crusher frame is made of steel plate of high strength and elasticity. Points subject to stress are reinforced
with heavy ribs or made in box section.
Eccentric Shaft of this machine is made of special high-grade forged steel and very accurately machined.
The shaft is amply dimensioned and the changes between various diameters have been designed so as to reduce the danger of fatigue as much as possible.
Jaw plates of this machine are made of manganese steel of great wearing strength. The backs are surface ground ensuring good contact with the frame and the moving jaw. Thejaw plates are reversible, allowing full utilization. Both fine—toothed and coarse-toothed jaw plates are available.
Cheek plates are also made of manganese steel. They are in two parts, so that the lower part, which takes most of the wear, can be replaced separately.
Toggle of this crusher is made of accrete steel plates in proper thickness or made of steel casting.
The proper length of toggle designing for this kind of crusher causes the best angle between fixed toggle
and moving toggle, not over than standard length, so it avoids throwing rocks out.
The roller bearings are of the spherical type which adjusts themselves to the deflection of the shaft.They are protected by labyrinth seals which are designed with minimum play and effectively prevent dust and dirt from penetrating into the bearings and grease from being forced out. On this crusher the frame bearings are mounted in replaceable housings which are in turn secured in recesses in the frame with bearing caps.
The function of the adjusting device is to compensate for wear on the jaw plates, toggle seats and
toggle plate and to provide minor adjustment of the discharge opening. The adjusting wedge is
raised or lowered by means of the adjusting bolts and the horizontal movement of the groove block
is followed by the toggle plate and moving jaw, thus altering the discharge opening of the crusher.
Adjustment can be carried out while the crusher is in motion.
For major alterations of the discharge opening, a longer or shorter toggle plate is fitted. Toggle
plates are available in various standard lengths. The above methods of adjustment can be used
only within certain limits. Ifthe lower section ofthe moving jaw is advanced too fartowards the fixed
jaw plate the nip angle will be too great and the material. With the aid of a third method of adjust-
ment it is, however, possible to make large alterations of the discharge opening without affecting
the nip angle. This is done by inserting a thicker or thinner shim behind the fixed jaw plate. Shims
are available in various standard thicknesses.
Changing the shim thickness behind the fixed jaw plate also alters the feed opening at the top. To
obtain the largest possible opening no thicker shim should be used than that required with regard
to a suitable nip angle.
Vertical adjustment of the Fixed Jaw plate
When altering the crusher setting the moving jaw is swung forward and upwards or backwards and downwards,
thus altering the vertical position of the movable jaw plate. Faulty vertical relationship between the jaw plates
will result in abnormal wear. The crushers are therefore equipped with facilities for adjusting the height of the
fixed jaw plate. Adjustment can be carried out by means of levers.
Selecting jaw crusher size
Size ofjaw crusher depends on desired size of feeding and its capacity. Crusher should be large enough to guar-
antee the average size of products. In practice, incompetent loading and other problems that may happen
during the functions should be considered.
Feed opening between jaw plates should be considerably more than the largest size of rocks that enter into the
crusher so that causes to reduce the danger of tumbling of disorder shaped rocks on top of the opening and not
entering into the opening to crush. Materials can enter to the opening with no stop, to increase the total capacity.
Size of feed opening between jaw plates are different, depends on type and condition of crushing. In a primary
crusher, when the feeding includes determined rocks, controlling of roll and cubic rocks is simple than erratic
* Smaller closed side settings can be often used depending on application and production requirements . For a
performance estimation for your specific application, please contact Mahyar Crusher company.
** The above figures are based on feed material with an average specific gravity of 2.6, with a maximum feed
size that will readily enter the crushing chamber without bridging. The capacities may very depending of the
feeding method and on feed characteristics such as gradation, bulk density, moisture, clay content and crush-
Primary Jaw Crusher
*POWER VARIATION - The power required will very with produced size, capacity and rock characteristics.
**CRUSHER CAPACITY - The capacities given are in metric tones. They are based on crushing clean dry lime-
stone weighing Ioose about 1534 Kg/m and having a specific gravity of 2.6 wet sticky feeds will tend to reduce
**TO MAXIMISE CAPACITY - A feeder should be used ahead of the crusher to give a continues regulated feed,
all feed should be of a size that will readily enter the crushing chamber and undersize material should be removed
from the feed by means of grizzly or scalping screen to eliminate packing and excessive wear of the jaws.