Information
-
Patent Grant
-
6189820
-
Patent Number
6,189,820
-
Date Filed
Saturday, March 20, 199925 years ago
-
Date Issued
Tuesday, February 20, 200123 years ago
-
Inventors
-
Original Assignees
-
Examiners
Agents
- Marshall, O'Toole, Gerstein, Murray & Borun
-
CPC
-
US Classifications
Field of Search
US
- 241 1862
- 241 1863
- 241 2571
- 241 249
- 241 1891
- 241 2852
- 241 2853
- 241 301
-
International Classifications
-
Abstract
A method and apparatus for adapting a horizontal shaft impact crusher for efficient crushing of different types of material are provided. At least two feed plates are provided. The feed plates each have a different feed angle adapted for use with a predetermined type or types of aggregate material. The feed plates can be interchangeably mounted on the crusher to adapt the crusher for enhanced crushing efficiency with respect to the type of material to be crushed.
Description
FIELD OF THE INVENTION
The invention relates generally to impact crushers, and, more particularly, to a method and apparatus for adapting a horizontal shaft impact crusher for efficient crushing of different types of materials.
BACKGROUND OF THE INVENTION
Horizontal shaft impact crushers are commonly employed to pulverize many different types of materials including, by way of examples, not limitations, asphalt, concrete, and rock. Such crushers typically include a frame defining a cavity. A rotating impeller driven by an external drive mechanism is disposed within the cavity. The frame includes an opening through which the material to be crushed is inserted into the cavity. One or more breaker plates are generally disposed within the cavity. The rotating impeller repeatedly throws the material to be crushed against the breaker plate(s) thereby breaking the material into small particles.
Horizontal shaft impact crushers generally use a feed plate to help guide the material to be crushed (sometimes referred to as the aggregate) into the hammer circle (i.e., the motion path of the impeller hammers or bars) where it is struck by the impeller bars and crushed. A feed plate is an elongated plate disposed at an angle within the material insertion opening to the cavity of the crusher. The material to be crushed is delivered to the feed plate by a conveyor or the like. The material to be crushed slides down the plate and into the cavity where it is crushed as explained above.
Horizontal shaft impact crushers are generally used to crush a wide range of materials. For example, a crusher may be used to crush asphalt one day, and thereafter be transported to a different site where it is used to crush concrete. Different materials have different physical properties and characteristics that effect their susceptibility to crushing. In view of these differences, applicants have found that it is desirable to insert different materials into crushers at different feed angles. By way of examples, not limitations, concrete and asphalt recycle crushing generally involves large, slabby material that requires a large feed opening to effectively feed the material into the crusher cavity. In contrast, secondary rock crushing involves relatively small uniform material. The crushing of such rock material is generally optimized with a steeper feed angle that allows better penetration into the hammer circle.
Prior art crushers generally employ a single feed plate having a fixed feed angle. This feed angle is generally optimized to work well with one range of material types, but compromises crushing efficiency for other material types.
Feed plates that are removably secured to the frame of an impact crusher are known in the prior art. However, such feed plates are removable to address concerns other than feeding/crushing efficiency such as feed material bridging and assembly considerations. These removable feed plates are not known to have been used in the past to optimize the feed geometry to the properties of the material to be crushed.
SUMMARY OF THE INVENTION
In accordance with an aspect of the invention, a method is provided for adapting a horizontal shaft impact crusher for use with different types of materials. The method includes the steps of: determining a first feed angle for delivering a first type of material to be crushed to the crusher to achieve enhanced crushing of the first type of material; selecting a first feed plate having a second feed angle that at least generally corresponds to the first feed angle; and securing the first feed plate to the crusher.
Optionally, the method may also comprise the steps of: determining a third feed angle for delivering a second type of material to be crushed to the crusher to achieve enhanced crushing of the second type of material; selecting a second feed plate having a fourth feed angle that at least generally corresponds to the third feed angle; removing the first feed plate from the crusher; and securing the second feed plate to the crusher. The third feed angle is different than the first and second feed angles.
In accordance with another aspect of the invention, a kit is provided. The kit includes a first feed plate having a first feed angle for delivering a first type of material to be crushed to the crusher to achieve enhanced crushing of the first type of material. It also includes a second feed plate having a second feed angle for delivering a second type of material to be crushed to the crusher to achieve enhanced crushing of the second type of material. The second feed angle is different than the first feed angle. The first and second feed plates are adapted for interchangeable securement to a crusher to adapt the crusher for enhanced crushing of the first and second types of materials.
Preferably, the kit also includes fasteners for selectively securing the first feed plate or the second feed plate to the crusher.
In accordance with still another aspect of the invention, a feed plate is provided. The feed plate includes a baseplate and a plurality of gussets mounted to the baseplate. Each of the gussets is disposed substantially perpendicularly to the baseplate and defines a crown spaced a distance from the baseplate. The feed plate also includes a faceplate mounted to the gussets. The gussets support the faceplate at an angle to the baseplate. The faceplate has a curved portion dimensioned to mate with and overlie the curved crown of the gussets.
In accordance with a still further aspect of the invention, a method of adapting a horizontal shaft impact crusher for use with different materials comprises determining a first desired feed angle for delivering a first type of material to be crushed to the crusher to achieve enhanced crushing of the first type of material, determining a second desired feed angle for delivering a second type of material to be crushed to the crusher to achieve enhanced crushing of the second type of material, choosing a feed plate from a selected set of feed plates, the selected set of feed plates including a first feed plate having a first desired feed angle adapted for use with the first type of material, the selected set further including a second feed plate having a second desired feed angle adapted for use with the second type of material, and securing the selected feed plate to the crusher.
Other features and advantages are inherent in the apparatus claimed and disclosed or will become apparent to those skilled in the art from the following detailed description and its accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1
is a schematic illustration of a horizontal shaft impact crusher employing a removable feed plate constructed in accordance with the teachings of the instant invention.
FIG. 2
is a side detail view of the feed plate of FIG.
1
.
FIG. 3
is a schematic illustration of the horizontal shaft impact crusher of
FIG. 1
employing a second removable feed plate constructed in accordance with the teachings of the invention.
FIG. 4
is a side detail view of the feed plate of FIG.
3
.
FIG. 5
is a perspective view of a crusher frame.
FIG. 6
is a perspective view of a feed plate constructed in accordance with the teachings of the invention.
FIG. 7
is a top plan view of the feed plate of FIG.
6
.
FIG. 8
is a rear elevational view of the feed plate of FIG.
6
.
FIG. 9
is a left side view of the feel plate of FIG.
6
.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Feed plates
10
,
11
constructed in accordance with the teachings of the invention are shown in
FIGS. 1 and 3
in a preferred environment of use, namely, mounted on a horizontal shaft impact crusher
12
. While for clarity of illustration, the feed plates
10
,
11
are shown herein mounted on a specific type of crusher
12
, persons of ordinary skill in the art will readily appreciate that the teachings of the invention are in no way limited to use with that crusher
12
or to any other particular environment of use. On the contrary, feed plates constructed in accordance with the teachings of the invention may be used with any crusher which would benefit from the advantages they offer without departing from the scope or spirit of the invention.
The illustrated crusher
12
is a horizontal shaft impact crusher. Thus, as is well known in the art, the crusher
12
includes a frame or housing
14
that defines an internal cavity (see FIG.
5
). An impeller
20
is journalled in a bearing (not shown) mounted adjacent an opening
22
in the frame
14
(see FIG.
5
). As shown in
FIGS. 1 and 3
, the impeller
20
is provided with a plurality of bars or hammers
24
for striking and propelling aggregate material. The impeller
20
is mounted for rotation within the cavity in a generally horizontal position and is coupled to a drive mechanism (not shown) through a gear train (not shown) which imparts rotational movement to the impeller
20
. Material to be crushed is inserted into the cavity through an insertion opening
30
defined in the frame
14
(see FIG.
5
).
In order to provide a striking surface to break material propelled by the impeller
20
within the cavity, the crusher
12
is further provided with conventional breaker plates
32
,
34
. As is conventional, the illustrated crusher
12
has a primary breaker plate
32
and a secondary breaker plate
34
, both of which are suspended within the cavity adjacent the motion path
36
of the impeller hammers
24
. When material is inserted into the crusher
12
, the impeller
20
strikes and propels the material against the breaker plates
32
,
34
.
The breaker plates
32
,
34
are suspended within the cavity by adjusting rods
38
. The adjusting rods
38
are secured to the braker plates
32
,
34
within the cavity. As shown in
FIG. 1
, the rods
38
extend out of the crusher
12
. By adjusting the position of the adjusting rods
38
, one can adjust the position of the breaker plates
32
,
34
within the cavity.
For the purpose of supplying material to be crushed to the cavity of the crusher
12
, a feed plate
10
,
11
is removably mounted to a mounting plate
40
formed by the crusher frame
14
(see
FIG. 5
) adjacent the insertion opening
30
. More specifically, in the illustrated embodiment, the crusher
12
may be provided with a kit including two interchangeable feed plates
10
,
11
. One of the feed plates
10
defines a first feed angle for delivering a first type of material to be crushed to the cavity to achieve enhanced crushing of a first type of material (see FIG.
2
). The other feed plate
11
defines a second feed angle for delivering a second type of material to be crushed to the cavity to achieve enhanced crushing of a second type of material (see FIG.
4
). In the illustrated embodiment, the first feed angle is smaller than the second feed angle. Thus, by way of example, not limitation, the feed plate
10
of
FIGS. 1 and 2
is particularly well suited for feeding large, slabby materials such as concrete or asphalt into the crusher whereas the feed plate
11
shown in
FIGS. 3 and 4
is particularly well suited for delivering small, relatively uniform materials into the crusher
12
. In any event, as shown in
FIGS. 1 and 3
, the feed plates
10
,
11
can be interchangeably secured to the mounting plate
40
of the crusher
12
to adapt the crusher for enhanced crushing of either the first type of material or the second type of material, whichever is presently available for crushing.
Since, other than their feed angles, the feed plates
10
,
11
are substantially identical, the following detailed discussion of the structure of a preferred feed plate refers to both feed plates
10
and
11
. Preferably, the feed plates
10
,
11
are constructed of steel plate. Turning to
FIGS. 6-9
, the feed plates
10
,
11
are preferably of a length sufficient to extend across the entire opening
30
to the cavity. The feed plates
10
,
11
include a substantially planar baseplate
50
. They also include a plurality of support plates or gussets
52
. The gussets
52
are mounted to the baseplate
50
in a plurality of parallel planes, each of which is perpendicular to the plane of the baseplate
50
. While the gussets
52
can be mounted to the baseplate
50
in many ways without departing from the scope or spirit of the invention, in the preferred embodiment the gussets
52
are welded to the baseplate
50
.
As most easily seen in
FIGS. 2 and 4
, the gussets
52
have a generally triangular shape. Each gusset
52
defmes a crown
54
which is spaced a distance away from the baseplate
50
. An end plate
53
is preferably mounted at each end of the feed plates
10
,
11
.
The feed plates
10
,
11
are also provided with a faceplate
60
which is mounted on the gussets
52
. The gussets
52
support the faceplate
60
at an angle to the baseplate
50
. The angle between the faceplate
60
and the baseplate
50
defmes the feed angle of the corresponding feed plate
10
or
11
.
To prevent aggregate material from falling behind the faceplate
60
during use of the feed plate
10
,
11
, the faceplate
60
includes a curved portion
62
which is dimensioned to mate with and overlie the curved crowns
54
of the gussets (see FIGS.
2
and
4
). An extension
63
depends downwardly from the curved portion
62
.
For the purpose of removably securing the feed plate
10
,
11
to the crusher
12
, the baseplate
50
of the feed plate
10
,
11
defmes a plurality of bores
64
. As shown in
FIGS. 1 and 3
, a shelf
68
is mounted to the housing
14
, such that a pocket
69
is created between the mounting plate
40
and the shelf
68
. A stripper bar
66
is disposed within the pocket
69
, and acts to break or otherwise interrupt the resulting stream of turbulent air created by the rotating impeller
20
. The stripper plate
66
is adjustably secured to the housing
14
. The mounting plate
40
defines a plurality of bores
70
which are arranged for alignment with the bores
64
of the baseplate
50
. As shown in
FIGS. 2 and 4
, the distal bores
70
of the mounting plate
40
are countersunk whereas the proximal bores
70
are not countersunk.
Fasteners
72
are provided for securing the undersurface of the base plate
50
to the mounting plate
40
. Preferably, the fasteners
72
are implemented as threaded bolts and are provided with the kit including the feed plates
10
,
11
.
As also shown in
FIGS. 2 and 4
, to extend the useful life of the feed plates
10
,
11
, each of the feed plates
10
,
11
is further provided with a wear plate
76
which is removably secured to its faceplate
60
. The wear plate
76
is secured to the faceplate
60
via fasteners
72
(see
FIGS. 2 and 4
) which are preferably implemented by threaded bolts. To this end, both the faceplate
60
and the wear plate
76
are provided with bores
80
which align when the wear plate
76
and faceplate
60
are assembled.
In operation, the manufacturer of the crusher
12
, wholesaler, user, or other person or entity (hereinafter referred to as the “user”) identifies the type of material to be crushed. Once the material is identified, the user determines an appropriate feed angle for delivering the identified type of material to the crusher
12
to achieve enhanced crushing of the material. The user then selects a feed plate
10
or
11
having a feed angle that generally corresponds to the determined feed angle. The selected feed plate
10
or
11
is then secured to the crusher
12
as explained above and the crusher
12
is operated to crush the subject material.
If it is subsequently determined that a different type of material is to be crushed, the user determines the appropriate feed angle for delivering the new type of material to the crusher
12
to achieve enhanced crushing. If a different feed angle is desired, the user selects a feed plate
11
or
10
having a feed angle that generally corresponds to the desired feed angle. The feed plate
10
or
11
currently mounted on the crusher
12
is then removed, and the new feed plate
11
or
10
is mounted on the crusher
12
. The crusher
12
is then operated.
Persons of ordinary skill in the art will appreciate that a method and kit for adapting a crusher for enhanced crushing of different types of material has been provided. Although the disclosed kit includes only two feed plates
10
,
11
together with the plate
76
and fasteners
72
, persons of ordinary skill in the art will readily appreciate that other items can be included in the kit without departing from the scope or the spirit of the invention. By way of example, not limitation, additional feed plates having feed angles different than those illustrated herein can be included without departing from the scope or spirit of the invention.
Additionally, persons of ordinary skill in the art will readily appreciate that the feed angles of the illustrated feed plates
10
,
11
are for illustration purposes only. Accordingly, it will be appreciated that feed plates
10
,
11
with different feed angles can be used without departing from the scope or spirit of the invention.
From the foregoing, persons of ordinary skill in the art will also appreciate that bolt-in feed plates such as those disclosed herein can be used to optimize the feed point location with respect to the hammer circle
36
to achieve better crushing in different applications. Such persons will also appreciate that bolt-in feed plates such as those disclosed herein allow crushers to be retrofit for specific applications within the field with minimal effort.
Although certain instantiations of the teachings of the invention have been described herein, the scope of coverage of this patent is not limited thereto. On the contrary, this patent covers all instantiations of the teachings of the invention fairly falling within the scope of the appended claims either literally or under the doctrine of equivalents.
Claims
- 1. A kit for use with a horizontal shaft impact crusher having a rotating impeller proceeding along a circular path, the kit comprising:a first feed plate having a first feed angle relative to the circular path for delivering a first type of material to be crushed to the crusher to achieve enhanced crushing of the first type of material, the first feed plate further including a first baseplate, a plurality of gussets mounted to the first baseplate, each of the gussets being disposed substantially perpendicularly to the first baseplate and defining a crown spaced a distance from the first baseplate, and a first faceplate mounted to the gussets, the gussets supporting the first faceplate at the first feed angle with respect to the first baseplate; and a second feed plate having a second feed angle relative to the circular path for delivering a second type of material to be crushed to the crusher to achieve enhanced crushing of the second type of material, the second feed angle being different than the first feed angle, the first and second feed plates being adapted for interchangeable securement to a crusher to adapt the crusher for enhanced crushing of the first and second types of materials.
- 2. A kit as defined in claim 1 further comprising fasteners for selectively securing the first feed plate or the second feed plate to the crusher.
- 3. A kit as defined in claim 1 wherein the first faceplate has a curved portion dimensioned to mate with and overlie the curved crown of the gussets.
- 4. A kit as defined in claim 1 wherein the second feed plate further comprises:a second baseplate; a plurality of gussets mounted to the second baseplate, each of the gussets being disposed substantially perpendicularly to the second baseplate and defining a crown spaced a distance from the second baseplate; and a second faceplate mounted to the gussets, the gussets supporting the second faceplate at the second feed angle with respect to the second baseplate.
- 5. A kit as defined in claim 4 wherein the second faceplate has a curved portion dimensioned to mate with and overlie the curved crown of the gussets.
- 6. A kit comprising:a first feed plate having a base plate, a face plate, and a plurality of gusset plates interconnecting the base plate and the face plate, each of the gusset plates being shaped to define a first feed angle between the base plate and the face plate, the first feed angle being chosen for delivering a first type of material to be crushed to the crusher to achieve enhanced crushing of the first type of material; and a second feed plate having a base plate, a face plate, and a plurality of gusset plates interconnecting the base plate and the face plate, each of the gusset plates being shaped to define a second feed angle between the base plate and the face plate, the second feed angle being chosen for delivering a second type of material to be crushed to the crusher to achieve enhanced crushing of the second type of material, the second feed angle being different than the first feed angle, the first and second feed plates being adapted for interchangeable securement to a crusher to adapt the crusher for enhanced crushing of the first and second types of materials.
- 7. The kit of claim 6, wherein each of the gusset plates of the first feed plate and each of the gusset plates of the second feed plate include a curved crown, and further wherein the face plate of the first feed plate and the face plate of the second feed plate include a curved portion shaped to overlie the curved crown of its corresponding gusset plates.
- 8. A kit for use with a horizontal shaft impact crusher having a rotatable impeller rotating through a circular path, the kit comprising:a first feed plate having a base plate, a face plate, and a plurality of gusset plates interconnecting the base plate and the face plate, the gusset plates being adapted to position the face plate to thereby define a first feed path, the first feed path being disposed at a first angle relative to the circular path, the face plate having a curved portion and a downwardly depending extension, each of the gusset plates having a curved crown adapted to receive thereon the curved portion of the face plate; and a second feed plate having a base plate, a face plate, and a plurality of gusset plates interconnecting the base plate and the face plate, the gusset plates being adapted to position the face plate to thereby define a second feed path, the second feed path being disposed at a second angle relative to the circular path, the face plate having a curved portion and a downwardly depending extension, each of the gusset plates having a curved crown adapted to receive thereon the curved portion of the face plate.
US Referenced Citations (3)