Solid material comminution or disintegration – Apparatus – Cooperating comminuting surfaces
Reexamination Certificate
1999-12-02
2001-11-13
Rosenbaum, Mark (Department: 3725)
Solid material comminution or disintegration
Apparatus
Cooperating comminuting surfaces
Reexamination Certificate
active
06315225
ABSTRACT:
FIELD OF THE INVENTION
The present invention generally relates to conical or gyratory crushers. More specifically, the present invention relates to an anti-spin method and apparatus for such crushers.
BACKGROUND OF THE INVENTION
Rock crushers, such as, conical or gyratory crushers, include assemblies which gyrate or otherwise move to crush material. The assemblies are often moved by an eccentric mechanism, which can be driven by various power sources. A conical or gyratory crusher typically includes a frame having a central hub surrounded by an annular shell. An annular ring is mounted on the annular shell and is capable of vertical movement with respect to the shell. A bowl, which can be provided with a liner, is mounted on the annular ring.
A conical head assembly, which is often provided with a liner, or a mantle, is supported by a bearing mechanism on a stationary shaft supported by the central hub. The eccentric mechanism, mounted for rotation about the stationary shaft, provides gyrational movement of the conical head assembly relative to the bowl. By adjusting the vertical height of the bowl with respect to the conical head, a crushing cavity (gap or space) between the bowl liner (or bowl) and the mantle (or head) can be adjusted to determine the particle size to which the material will be is crushed.
Conventional crushers can be susceptible to unsafe operation and excessive wear if the mantle or head is improperly allowed to spin with respect to the bowl or bowl liner. For example, if a conical or gyratory crusher is operated without any material in the crushing cavity (such as, at start-up and shut-down), the rotational motion of the eccentric mechanism can cause the crushing head to turn with respect to the bowl. When rocks enter the cavity, while the head is improperly spinning, some rocks may eject upward from the crusher. Also, due to the high relative motion between the spinning head and the rock in the cavity, there will be excessive wear on the mantle and liner (e.g., the liners), leading to more frequent changes of the liners and reducing overall productivity of the crusher. The spinning action can cause the mantle and bowl liner or head and bowl to wear excessively, thereby reducing the operating life of such components and increasing the amount of maintenance required for the crusher. The spinning action can also create undesirable high stresses in conical or gyratory crushers.
Heretofore, some rock crushers have included a clutch-based anti-spin mechanism to prevent undesirable spinning action during no-load or underload conditions. With reference to
FIG. 1
, an exemplary conventional crushing system
10
is shown as an Omnicone® crusher, manufactured by Nordberg, Inc. Crusher
10
includes a mantle
12
sitting on a crusher head
11
. Crusher head
11
gyrates within main frame
15
to crush rock or other material in crushing area or gap
18
between mantle
12
and a bowl liner
16
. Bowl liner
16
is mounted on a bowl
13
that is coupled to an annular ring
14
. Annular ring
14
sits upon main frame
15
.
System
10
includes a clutch-based, friction-based anti-spin mechanism
20
that is discussed in more detail with reference to FIG.
2
. Clutch-based, anti-spin mechanism
20
includes a feed plate
22
, a locking nut
24
, a locking bar
25
, a coupling slider
26
, a guide guard
27
, a coupling adaptor
28
, and a back-stop clutch
30
. Mechanism
20
is a relatively complex device which operates to prevent head
11
from spinning with respect to bowl
13
(
FIG. 1
) when system
10
is in an underload or no-load condition.
Mechanism
20
(
FIG. 1
) is attached to a top portion of head
11
(e.g., underneath the locking bolt which holds mantle
12
to crushing head
11
). The placement of anti-spin mechanism
20
at the top of crushing head
11
(near the top of crushing gap
18
) constrains the opening of the crusher. For example, the anti-spin mechanism in Omnicone® crushers, manufactured by Nordberg, Inc., is located at a pivot point of the head motion, which can impinge the available feed-opening sizes and decrease the mobility of large pieces of material (e.g., such as rock), in the crushing cavity. Because of these limitations, some crushers, such as, HP® crushers, manufactured by Nordberg, Inc., do not utilize an anti-spin mechanism. Clutch-based mechanisms must have a pivot point below the top end of the crusher head, which constrains material flow or movement at that location. Additionally, conventional anti-spin mechanisms can be expensive, fail quite often, and can be difficult to service. In fact, some anti-spin mechanisms are replaced rarely due to the described maintenance problems.
Thus, there is a need for a less expensive anti-spin mechanism that can be utilized with a variety of rock crushers. Further still, there is a need for an anti-spin mechanism that does not decrease the mobility of large pieces of rock at the top end of the crushing cavity and does not impinge upon the feed openings.
SUMMARY OF THE INVENTION
The present invention relates-to a rock crusher including a bowl, a crusher head and an anti-spin apparatus. The crusher head is disposed in the bowl. A crushing area is located between the head and the bowl. Material is provided to a top of the crushing area and exits at a bottom of the crushing area. The anti-spin apparatus is disposed closer to the bottom than to the top.
The present invention further relates to a bowl liner for a rock crusher. The rock crusher gyrates to crush a material provided to a crushing gap between a crusher head and a bowl. The material enters the crushing gap from a top end and leaves the crushing gap from a bottom end. The rock crusher has at least one first anti-spin element closer to a bottom than to a top end of the crushing space. The bowl liner includes at least one second anti-spin element disposed to engage the first anti-spin element. The second anti-spin element prevents the crusher head from spinning with respect to the bowl.
The present invention also relates to a rock crusher including a bowl, a crusher head, and an anti-spin means. The crusher head is disposed in the bowl. The anti-spin means prevents the crusher head from spinning with respect to the bowl. The anti-spin means is not located at the top of the crusher head.
The present invention still further relates to a mantle for a rock crusher. The rock crusher gyrates to crush a material provided to a crushing gap between a crusher head and a bowl. The material enters the crushing gap from a top end and leaves the crushing gap from a bottom end. The rock crusher has at least one first anti-spin element closer to the bottom end than to the top end. The mantle includes at least one second anti-spin element disposed to engage the first anti-spin element. The second anti-spin element prevents the crusher head from spinning with respect to the bowl.
REFERENCES:
patent: 1254192 (1918-01-01), Bartley
patent: 2134876 (1938-11-01), Hull et al.
patent: 2224542 (1940-12-01), Gruender et al.
patent: 2540358 (1951-02-01), Symons
patent: 3454230 (1969-07-01), Allen
patent: 3750809 (1973-08-01), DeDiemar et al.
patent: 4192472 (1980-03-01), Johnson
patent: 4225092 (1980-09-01), Matter et al.
patent: 4359208 (1982-11-01), Kelm et al.
patent: 4384684 (1983-05-01), Karra
patent: 4391414 (1983-07-01), Reiter
patent: 4406416 (1983-09-01), Tateishi
patent: 4560113 (1985-12-01), Szalanski
patent: 4575014 (1986-03-01), Szalanski et al.
patent: 4620185 (1986-10-01), Plahmer
patent: 4658638 (1987-04-01), Plahmer
patent: 4659026 (1987-04-01), Krause et al.
patent: 4703896 (1987-11-01), Fabian et al.
patent: 4733825 (1988-03-01), Boyes et al.
patent: 4750679 (1988-06-01), Karra et al.
patent: 4756484 (1988-07-01), Bechler et al.
patent: 4956078 (1990-09-01), Magerowski et al.
patent: 5029761 (1991-07-01), Bechler
patent: 5172869 (1992-12-01), Kitsukawa et al.
patent: 5638296 (1997-06-01), Johnson et al.
patent: 5732896 (1998-03-01), Jakob et al.
patent: 5775607 (1998-07-01), Bayliss et al.
patent: 5799885 (1998-09-01), Karra
patent: 6065698 (2
Foley & Lardner
Metso Minerals (Milwaukee) Inc.
Rosenbaum Mark
LandOfFree
Anti-spin method and apparatus for conical/gyratory crushers does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Anti-spin method and apparatus for conical/gyratory crushers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Anti-spin method and apparatus for conical/gyratory crushers will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2591999