Abstrict An impact crusher with a rotor and one or more impact members interconnected
to form an adjustable impact member system, a first impact member
being mounted pivotally around a first horizontal axis by way of
at least one drive means, on the second horizontal axis of which
a further impact member, pivotal by way of at least one drive means,
is provided, in which context the horizontal axis pivotally supporting
the impact member is provided in the region of that end of the first
impact member which is remote from the horizontal axis and the second
impact member comprises one or more levers.
Claims We claim:
1. An impact crusher comprising:
a housing;
an impact crusher rotor rotatable in said housing about a horizontal
rotor axis; and
at least one impact member assembly in said housing adjustable
relative to said rotor, said assembly including:
a first impact member having impact surfaces juxtaposed with said
rotor and pivotally mounted in said housing for movement about a
first horizontal pivot axis to shift said surfaces toward and away
from said rotor,
a first drive means articulated to said first impact member for
angularly displacing said first impact member about said first horizontal
pivot axis,
a second impact member having impact surfaces juxtaposed with said
rotor and pivotally mounted in said housing for movement about a
second horizontal pivot axis on said first impact member at a location
remote from said first horizontal pivot axis to shift said surfaces
of said second impact member toward and away from said rotor,
lever means swingable about said second horizontal pivot axis and
operatively connected with said second impact member for pivotally
displacing same about said second horizontal pivot axis, and
second drive means articulated to said lever for angularly displacing
said second impact member about said second horizontal pivot axis,
said lever means comprising a respective lever formed on said second
impact member on extensions thereof along said second horizontal
pivot axis on opposite sides of said first impact member, each of
said levers being pivotally connected with a respective second drive
means at a respective articulation point.
2. The impact crusher defined in claim 1 wherein said hinge points
and said second horizontal axis being so located so that, upon movement
of said first impact member away from said rotor, a gap between
said second impact member and said rotor increases.
3. The impact crusher defined in claim 1 wherein said housing includes
a movable housing part pivotally connected to a stationary housing
part for opening of said crusher and said first axis is provided
on said movable housing part.
4. The impact crusher defined in claim 1 wherein said housing includes
a movable housing part pivotally connected to a stationary housing
part for opening of said crusher and said first horizontal axis
is provided on said movable housing part, said points of articulation
and said second horizontal pivot axis being arranged relative to
a pivot axis of movable horizontal part that collision between said
second impact member with said rotor is precluded during opening
of said crusher by swinging of said movable housing part.
5. An impact assembly for an impact crusher having a rotor rotatable
in a housing about a horizontal rotor axis, said impact assembly
cooperating with said rotor to form an adjustable crushing gap,
said impact assembly including:
a first impact member having impact surfaces juxtaposed with said
rotor and pivotally mounted in said housing for movement about a
first horizontal pivot axis to shift said surfaces toward and away
from said rotor,
a first drive means articulated to said first impact member for
angularly displacing said first impact member about said first horizontal
pivot axis,
a second impact member having impact surfaces juxtaposed with said
rotor and pivotally mounted in said housing for movement about a
second horizontal pivot axis on said first impact member at a location
remote from said first horizontal pivot axis to shift said surfaces
of said second impact member toward and away from said rotor,
lever means swingable about said second horizontal pivot axis and
operatively connected with said second impact member for pivotally
displacing same about said second horizontal pivot axis, and
second drive means articulated to said lever for angularly displacing
said second impact member about said second horizontal pivot axis,
said lever means comprising a respective lever formed on said second
impact member on extensions thereof along said second horizontal
pivot axis on opposite sides of said first impact member, each of
said levers being pivotally connected with a respective second drive
means at a respective articulation point.
6. The impact assembly defined in claim 5 wherein said hinge points
and said second horizontal axis are located so that, upon movement
of said first impact member away from said rotor, a gap between
said second impact member and said rotor increases.
Description FIELD OF THE INVENTION
Our present invention relates to an impact crusher of the type
in which a rotor is provided with crushing elements which cooperate
with impact members which cooperate to form a crushing gap and to
an impact member assembly suitable for use with such a rotor. More
particularly the invention relates to an impact crusher comprising
a rotor and two or more impact members interconnected to form an
adjustable impact member system, a first impact member being mounted
pivotally around a first horizontal axis by way of at least one
drive means, and having a second horizontal axis on which a second
impact member, pivotal by way of at least one drive means, is provided.
BACKGROUND OF THE INVENTION
An impact crusher for crushing material of various consistencies
is known for example from DE 23 31 729 A1 in which the impact plates
are interconnected in articulated manner to form a coherent composite
pivotal impact member, each of the interconnected impact plates
deriving adjustable support individually from the housing.
The impact plates may have impact surfaces which are at angles
to one another or are stepped along the path of the material as
it is entrained from the inlet side of the machine. The principles
of such machines have also been developed in the Chemical Engineers
Handbook, Perry and Chilton, 5th edition, McGraw Hill Book Company,
New York, 1973 at Chapter 8 pages 19 ff.
This known impact crusher, just like impact other crushers of the
same genus, suffers from the substantial drawback that the upper
impact member, provided downstream of the machine inlet yields outwardly
due to foreign objects which cannot be crushed entering the machine,
so that the crushing gap between the rotor and the lower impact
member is decreased to such an extent, due to the upper impact member
pivoting outwardly, that a risk arises of foreign objects getting
wedged between the rotor and the impact member, leading to possible
damage to the rotor and/or the impact member, so that the continued
operability of the installation can no longer be ensured.
OBJECTS OF THE INVENTION
It is the principal object of the present invention to provide
an improved impact crusher such that the damage which can be caused
by the entry of a noncrushable foreign object can be minimized.
Another object of the invention is to provide an improved impact
crusher which is free from the drawbacks of earlier devices or apparatuses
of this type and particularly the drawbacks mentioned above.
Still another object of this invention is to provide improved impact
assembly for a rotor-type crusher or breaker whereby drawbacks which
could have resulted in down time can be avoided.
SUMMARY OF THE INVENTION
These objects are attained, in accordance with the invention in
an impact crusher of the type in which a rotor and two or more impact
members are provided along the path of the crusher members of the
rotor to form an adjustable impact assembly. A first impact member
is pivotally mounted at a first horizontal axis and a second impact
member is pivotally mounted on the first impact member by a second
horizontal axis and respective drive means is provided for controlling
the displacement of the impact members.
According to the invention, the horizontal axis pivotally supporting
the second impact member is provided in the region of that end of
the first impact member which is remote from the first horizontal
axis and the second impact member comprises one or more levers.
It is an important feature of the invention that due to the specific
arrangement of the point of engagement for the support and the point
of articulation of the lower impact member to the lever, the crushing
gap between the lower impact member and the rotor is enlarged in
the event of the upper impact member yielding due to foreign object
interference.
Because of the geometrical relationships with regard to the cylinder
hinge point and the axes of the impact members, the edge of the
lower impact member closest to the rotor is moved automatically
in such a manner during opening of the impact member, for which
purpose a housing member is swiveled around the pivotal axis, that
the edge does not collide with the rotor or the beater bars, thus
preventing damage.
Different drive means, preferably hydraulic cylinders, may be employed
in order to adjust the two impact members.
More particularly, the impact crusher can comprise:
a housing;
an impact crusher rotor rotatable in the housing about a horizontal
rotor axis; and
at least one impact member assembly in the housing adjustable relative
to the rotor, the assembly including:
a first impact member having impact surfaces juxtaposed with the
rotor and pivotally mounted in the housing for movement about a
first horizontal pivot axis to shift the surfaces toward and away
from the rotor,
a first drive means articulated to the first impact member for
angularly displacing the first impact member about the first horizontal
pivot axis,
a second impact member having impact surfaces juxtaposed with the
rotor and pivotally mounted in the housing for movement about a
second horizontal pivot axis on the first impact member at a location
remote from the first horizontal pivot axis to shift the surfaces
of the second impact member toward and away from the rotor,
at least one lever swingable about the second horizontal pivot
axis and operatively connected with the second impact member for
pivotally displacing same about the second horizontal pivot axis,
and
second drive means articulated to the lever for angularly displacing
the second impact member about the second horizontal pivot axis.
The impact crusher according to the invention is characterized
by a particularly high operational reliability and, therefore, a
particularly long useful life due to the advantageous arrangement
of the point of engagement for the support of the lower impact member.
BRIEF DESCRIPTION OF THE DRAWING
The above and other objects, features, and advantages will become
more readily apparent from the following description, reference
being made to the accompanying drawing in which:
FIG. 1 is a diagrammatic transverse section through an impact crusher
according to the invention;
FIG. 1A is the impact crusher of FIG. 1 shown with pivotal housing
in open position;
FIG. 2 is a section taken along the line II--II of FIG. 1; and
FIG. 3 is a detail view of the connection of the levers with extensions
of the second impact member.
SPECIFIC DESCRIPTION
The impact crusher illustrated in FIG. 1 comprises a housing member
9 adapted to swing open around a pivotal axis 8 in order to open
the impact crusher, and includes a rotor 10 adapted to be rotationally-driven,
equipped with crushing elements, not shown in the drawing.
Two impact members 1 and 4 equipped with a multitude of impact
elements 11 are provided in a manner facing the rotor 10.
The impact member 1 disposed above the impact member 4 is pivotally
mounted around a horizontal axis 2 by way of at least one cylinder
3 or a different drive element engaging in a hinge point 3a. At
an end of the impact members in the region remote from the axis
2 i.e. at a lower end, a further horizontal axis 6 is provided
for pivotally mounting the impact member 4. The gap between the
impact members 1 4 and the rotor 10 can be denoted as crushing
chute.
The impact member 4 comprises one or more levers 4a on which one
or a plurality of cylinders 5 or other drive elements engages/engage
at the associated hinge point 5a.
The crushing gap 7 is formed by the impact member 4 and the rotor
10.
The material to be crushed, reaching the impact crusher in the
direction of the arrow 22 is pre-crushed in the upper region of
the crusher and is further crushed by the upper impact member 1
being finally crushed to the pre-set particle size by the lower
impact member 4 in the crushing gap 7.
From FIG. 2 it will be apparent that two hydraulic cylinder drivers
5 are provided on each side of the impact member 1 and are connected
to respective levers 4a and from FIG. 3 it can be seen that each
lever 4a which is rigid with the member 4 is on an extension 4b
of that impact member to the respective side of the impact member
1.
The impact surfaces of the impact members 1 and 4 are provided
at 12 and 13 on the impact members and the pivot axis 8 for the
housing part 9 carrying the axis 2 is so arranged with respect to
the articulation points 5a and the axis 6 that, when the housing
part 9 is swung open in the counterclockwise direction and the drives
3 and 5 are correspondingly actuated, there will be no collision
between the impact members 1 and 4 and the rotor 10 or the crushing
elements thereon. |