Abstrict In order to design the positional displacement of the impact member
structurally simple and operationally reliable in an impact crusher
having a rotor 9 and an impact member provided in the housing in
an adjustable position directly underneath the feed aperture of
the material to be crushed, the impact member is provided with an
impact plate linearly displaceable in relation to the rotor.
Claims We claim:
1. An impact crusher comprising:
a crusher housing formed with an intake aperture for receiving
material to be crushed;
a crusher rotor rotatable beneath said intake aperture in said
crusher housing;
an impact plate mounted in said housing directly below said intake
aperture and above said rotor, said plate lying in a plane and having
a lower edge juxtaposed with said rotor and defining a crushing
gap of the impact crusher with said rotor; and
means for mounting said impact plate for linear movement thereof
in said plane toward and away from said rotor to adjust said crushing
gap of the impact crusher, said mounting means including
a pair of horizontally spaced lateral support flanges formed on
said housing and supporting opposite horizontally spaced edges of
said impact plate, said support flanges having surfaces guiding
said plate for movement in said plane, and
a pair of hydraulic adjusting cylinders operatively connected to
said impact plate at said opposite edges for linearly displacing
said impact plate along said surface of said lateral support flanges.
2. The impact crusher defined in claim 1 wherein said mounting
means includes a support plate at a lower side of said impact plate
at each of said support flanges, and a respective variable number
of spacers received between each of said support plates and said
lower side of said impact plate.
3. The impact crusher defined in claim 2 wherein each of said spacers
is provided with a handle enabling insertion of said spacers and
removal of said spacers between the respective support plate and
said lower side of said impact plate.
4. The impact crusher defined in claim 3 wherein said mounting
means includes a plurality of hydraulic pressing cylinders actuatable
for pressing said impact plate against said support flanges.
5. The impact crusher defined in claim 4 further comprising a
protective cap on each of said hydraulic pressing cylinders.
6. An impact crusher comprising:
a crusher housing formed with an intake aperture for receiving
material to be crushed;
a crusher rotor rotatable beneath said intake aperture in said
crusher housing;
an impact plate mounted in said housing directly below said intake
aperture and above said rotor, said plate lying in a plane and having
a lower edge juxtaposed with said rotor and defining a crushing
gap of the impact crusher with said rotor; and
means for mounting said impact plate for linear movement thereof
in said plane toward and away from said rotor to adjust said crushing
gap of the impact crusher, said mounting means including a pair
of horizontally-spaced lateral support flanges formed on said housing,
and
a support plate at a lower side of said impact plate at each of
said support flanges, and a respective variable number of spacers
received between each of said support plates and said lower side
of said impact plate.
7. The impact crusher defined in claim 6 wherein each of said spacers
is provided with a handle enabling insertion of said spacers and
removal of said spacers between the respective support plate and
said lower side of said impact plate.
8. An impact crusher comprising:
a crusher housing formed with an intake aperture for receiving
material to be crushed;
a crusher rotor rotatable beneath said intake aperture in said
crusher housing;
an impact plate mounted in said housing directly below said intake
aperture and above said rotor, said plate lying in a plane and having
a lower edge juxtaposed with said rotor and defining a crushing
gap of the impact crusher with said rotor; and
means for mounting said impact plate for linear movement thereof
in said plane toward and away from said rotor to adjust said crushing
gap of the impact crusher, said mounting means including a pair
of horizontally-spaced lateral support flanges on said housing,
and a plurality of hydraulic pressing cylinders actuatable for pressing
said impact plate against surfaces of said support flanges.
9. The impact crusher defined in claim 8 further comprising a
protective cap on each of said hydraulic pressing cylinders.
Description FIELD OF THE INVENTION
The present invention relates to an impact member and a mounting
assembly for an impact crusher having a rotor and an impact member
provided in a crusher housing so that the position of the impact
member can be adjusted directly underneath the feed aperture for
the material to be crushed.
BACKGROUND OF THE INVENTION
An impact crusher is known from DE 44 40 076 C1 and has an impact
member provided directly underneath the entry to the housing and
pivotal around a horizontal axis. Such impact members are structurally
complex and prone to faulty operation.
OBJECT OF THE INVENTION
It is the principal object of the invention to provide an impact
member and a mounting assembly for an impact crusher which are of
simple design and operationally reliable.
SUMMARY OF THE INVENTION
This object is achieved with an impact member which has an impact
plate linearly displaceable in relation to the rotor.
It is an important feature of the invention that the impact member
directly underneath the entry to the housing, is mounted so as to
be linearly displaceable in relation to the rotor via drive mechanisms,
for example hydraulic cylinders, the requisite gap width of the
crushing gap being ensured by the provision of a predetermined number
of spacer discs or shims on support plates or flanges.
A further important feature of the present invention resides in
that the impact plate, brought into its working position by means
of spacer discs or shims, is firmly pressed onto the support flanges
by hydraulic pressure cylinders. This ensures that the function
of the impact member is ensured in all circumstances and that no
damaging foreign-object material can enter between these two parts,
thereby ensuring a troublefree displacement of the impact plates.
Each one of the variable number of pressure cylinders projecting
into the crushing chamber, is further protected against damage and
dust by a protective cap.
This linearly displaceable impact plate according to the invention
for impact crushers is characterized, in particular, by a low production
cost. In addition, it is easy to employ. Also, it allows short retooling
periods and ensures a troublefree crushing operation.
According to the invention, therefore, the impact member in an
impact crusher can comprise
an impact plate mounted in said housing directly below said intake
aperture and above said rotor; and
means for mounting said impact plate for linear movement thereof
relative to said rotor to adjust a crushing gap of the impact crusher.
According to a feature of the invention, the mounting means includes
a pair of horizontally spaced lateral support flanges formed on
said housing and supporting opposite horizontally spaced edges of
said impact plate, and a pair of hydraulic adjusting cylinders operatively
connected to said impact plate at said opposite edges for linearly
displacing said impact plate along said lateral support flanges.
The mounting means can include a support plate at a lower side
of said impact plate at each of said support flanges, and a respective
variable number of spacers received between each of said support
plates and said lower side of said impact plate.
Each of the spacers can be provided with a handle enabling insertion
of said spacers and removal of said spacers between the respective
support plate and said lower side of said impact plate.
The mounting means can include a plurality of hydraulic pressing
cylinders actuatable for pressing said impact plate against said
support flanges.
Since the hydraulic pressing cylinders are exposed in the crushing
chamber, it has been found to be advantageous to provide a protective
cap on each of the hydraulic pressing cylinders.
The invention also comprises an impact crusher having a housing,
a rotor and at least one impact member with a breaker plate and
mounting means as described. A plurality of breaker members can
also be provided in angularly spaced relationship about the orbit
of the rotor, and, while all or some of the breaker plates can be
linearly displaceable as has been described, at least one impact
member is provided directly below the intake opening and that impact
member is provided, according to the invention, with the linearly
shiftable impact plate.
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 cross-section of the impact crusher including
the impact plate arrangement;
FIG. 2 is a section on a larger scale of the hydraulically activatable
impact plate support flange spacer disc arrangement according to
FIG. 1;
FIG. 3 is a section taken along the line III--III of FIG. 2 across
the impact plate-support flange arrangement; and
FIG. 4 is an elevational view of an impact crusher housing comprising
an impact plate drive mechanism and a spacer disc arrangement, partly
broken away.
SPECIFIC DESCRIPTION
The impact crusher shown in FIG. 1 comprises a rotor 9 adapted
to be rotationally-driven, mounted in a housing and usually equipped
with crushing elements not shown in the drawing, such as hangers.
The rotor 9 may, more particularly, be provided with hammers or
impact bars as described in the Chemical Engineers' Handbook Perry
and Chilton, 5th Edition, McGraw Hill Book Company, NY, 1973 Chapter
8 pages 22 ff or the German Patent Document 44 40 076 mentioned
previously.
Other impact breakers having impact members for which the impact
member of the invention can be substituted, can be found in German
Patent Documents 11 66 593 94 13 571.1 and 93 20 730.1 and Austrian
Patent Document 332 712. In general, the housing 20 (FIG. 1) can
include upper and lower housing parts 21 and 22 which can be swung
relatively to one another by a hydraulic cylinder arrangement 23
to afford access to the impact member 12 etc.
The outer shell of the housing is represented by the dot dash line
24 and the intake opening or aperture 25 has been shown in FIG.
1 as well. The housing can have a feed chute 26 communicating with
the intake aperture 25. The first impact member is provided on support
flanges 2 above the rotor 9 directly underneath the entry to the
housing. The impact member comprises the impact plate 1 which is
linearly displaceable in relation to the rotor 9 forming a crushing
gap with a stepwise adjustable gap width y for crushing large sized
components of the material to be crushed. In FIG. 1 the crusher
plate 1 is illustrated in the clamped position, i.e. with spacer
shims or discs 4 provided on a support plate 3 and with hydraulic
pressure cylinders 6 in working position.
The support flanges 2 are shown to be mounted on the structure
21 of the housing along the opposite edges of the impact plate 1
which, as can be seen from FIG. 3 has a bottom edge 27 and two
lateral edges 28 only one of which is seen in FIG. 3 but which
correspond to a similar edge on the opposite side of the plate which
is symmetrical with respect to a center symmetry plane 29 of the
crusher.
The edge 28 is provided with a step 30 forming an underside 31
which rests upon the stack of shins or spacers 4. The edge 28 can
be provided with a lug 32 to which the piston 33 of cylinder 8 is
pivotally connected.
The cylinder 8 is pivotally connected in turn, to a lug 34 affixed
to the support 2 and the cylinder 8 can be parallel to the support
for the linear displacement of the plate 1 along the support in
the direction represented by the double headed arrow 35 i.e. parallel
to the plane of the plate.
The hydraulic pressure cylinders 6 (see FIGS. 2 and 4) can be braced
against plates 36 forming part of the structure 21 previously described.
The axes of the cylinders 6 are perpendicular to the plane of the
impact plate 1 so that, when the cylinders 6 spaced apart across
the plate 1 are hydraulically actuated, the plate 1 can be clamped
against the support flanges 2.
FIGS. 2 and 3 in different views illustrate the impact plate 1
resting on the support flange 2 according to FIG. 1 including the
hydraulic cylinders 8 bringing about the linear displacement in
relation to the rotor 9 not shown here, and including spacer shims
or discs 4 with handles 5 mounted on support plates 3. The clamping
position is brought about by the associated hydraulic pressure cylinders
6. The fixation of the hydraulic cylinders 8 to the housing and
the impact plate 1 is also apparent from FIG. 3.
The handles 5 enable, with the cylinders 8 extended and the clamping
force of hydraulic cylinders 6 relieved, one or more spacers 4 to
be inserted between the support plates 3 and the underside of the
impact plate 1 to adjust the gap Y and the size of the material
produced between the rotor 9 and the impact plate 1. After the requisite
number of spacers has been introduced or the number of spacers has
been reduced to the desired number, the cylinders 8 can be actuated
to draw the impact plate 1 down against the respective stacks of
spacers, whereupon the cylinders 6 are actuated to clamp the impact
plate 1 to the support flanges 2.
FIG. 4 schematically shows the example of an arrangement of the
hydraulic pressure cylinders 6 and the hydraulic cylinder 8 on the
housing and the impact assembly comprising the arrangement of the
support plate 3 and the spacer shims or discs 4. From this FIG.
4 it is furthermore apparent that each of the hydraulic pressure
cylinders 6 projecting into the crushing chamber of the impact crusher
has a respective protective cap 7 protecting the pressure cylinders
6 against damage and dust.
The incremental linear displacement of the impact plate 1 in relation
to the rotor 9 forming a stepwise adjustable crushing gap, takes
place by releasing the hydraulic cylinders 8 with subsequent fitting
or removing of spacers 4 by means of their respective handles 5
and by subsequent lowering of the impact plate 1 as well as damping
of the latter by means of the hydraulic pressure cylinders 6. |