Abstrict A crushing device in a crusher includes a bucket-shaped body frame;
plural ring members provided in the body frame in such a manner
as to form steps at predetermined spaced intervals while diminishing
their sizes gradually from the upper position toward the lower position,
thereby to form a sieve with gaps as a whole; a teeth plate provided
at the bottom portion of the sieve and having recessed teeth and
protrusive teeth alternately formed on the inner surface thereof;
a crushing shaft provided at a central portion of the body frame;
and an inclined screw belt member mounted on the crushing shaft,
for crushing pieces of concrete on the teeth plate in combination
with the teeth plate.
Claims What is claimed is:
1. A crushing device in a crusher for crushing objects into fine
pieces, the crushing device comprising: a bucket-shaped body frame;
plural ring members provided in said body frame in a horizontal
orientation and forming steps at predetermined spaced intervals
while gradually diminishing in size from an upper position toward
a lower position of the body frame, thereby to form a sieve with
gaps; a teeth plate provided at the bottom portion of said sieve,
said teeth plate having recessed teeth and protrusive teeth alternately
formed on an inner surface thereof; a crushing shaft provided at
a central portion of said body frame; and an inclined screw belt
member mounted on said crushing shaft for crushing pieces of objects
in combination with said teeth plate.
2. The crushing device in a crusher for crushing objects into fine
pieces, as claimed in claim 1 wherein said inclined screw belt
has, on a lower surface, plural protuberances for impacting against
said teeth plate.
3. The crushing device in a crusher for crushing objects into fine
pieces, as claimed in claim 1 wherein a reinforced-concrete cutting
member is fixed on said crushing shaft, said reinforced-concrete
cutting member is located between said teeth plate and a motor rest
mounted at a bottom portion of said body frame.
4. The crushing device in a crusher for crushing objects into fine
pieces, as claimed in claim 1 wherein said ring members are of
elliptic shape, a region of said ring members extending from around
said crushing shaft toward one end of said body frame provides a
scooping portion for large chunks of concrete.
5. The crushing device in a crusher for crushing objects into fine
pieces, as claimed in claim 2 wherein said ring members are of
elliptic shape, a region of said ring members extending from around
said crushing shaft toward one end of said body frame provides a
scooping portion for large chunks of concrete.
6. The crushing device in a crusher for crushing objects into fine
pieces, as claimed in claim 3 wherein said ring members are of
elliptic shape, a region of said ring members extending from around
said crushing shaft toward one end of said body frame provides a
scooping portion for large chunks of concrete.
7. The crushing device in a crusher for crushing objects into fine
pieces, as claimed in claim 1 wherein a mesh plate is detachably
mounted on said body frame to block a bottom space of said body
frame and allow only fine pieces of concrete to fall through said
mesh plate.
8. The crushing device in a crusher for crushing objects into fine
pieces, as claimed in claim 1 wherein a width of each of the recessed
teeth and the protrusive teeth is adjusted by shifting said teeth
plate circumferentially.
Description BACKGROUND OF THE INVENTION
The present invention relates to a chunks-of-concrete crushing
device which also serves as a scooping device such as a bucket,
a shovel or the like mounted on the distal end of a rotatable arm
of an earthmover. Particularly, the present invention relates to
a crushing device capable of crushing chunks of concrete into very
fine pieces.
According to conventional crushing devices of this kind, chunks
of concrete are crushed into equalized pieces in size, and thus,
the efficiency of scattering pieces of crushed concrete is limited
low. That means that in the conventional crushing devices, there
are many cases where pieces of crushed concrete can not be scattered
over to distant points as desired, and it is not possible to obtain
pieces of various sizes.
SUMMARY OF THE INVENTION
It is an object of the present invention to improve the efficiency
of scattering pieces of crushed concrete, and to enable obtaining
easily as much fine pieces of crushed concrete as desired under
particular operative circumstances.
The crushing device according to the present invention comprises:
a bucket-shaped body frame; plural ring members provided in said
body frame in such a manner as to form steps at predetermined spaced
intervals while diminishing their sizes gradually from the upper
position toward the lower position, thereby to form a sieve with
gaps as a whole; a teeth plate provided at the bottom portion of
said sieve and having recessed teeth and protrusive teeth alternately
formed on the inner surface thereof; a crushing shaft provided at
a central portion of said body frame; and an inclined screw belt
member mounted on said crushing shaft, for crushing pieces of objects
on said teeth plate in combination with said teeth plate.
BRIEF DESCRIPTION OF THE DRAWINGS
The accompanying drawings show an embodiment of a crushing device
in a crusher for crushing objects into fine pieces, according to
the present invention.
FIG. 1 shows a plan view thereof.
FIG. 2 shows a longitudinally cross-sectional view thereof.
FIG. 3 shows a plan view of a teeth plate in the present invention.
FIG. 4 shows a plan view of said teeth plate, with its recessed
teeth and protrusive teeth shifted.
FIG. 5 shows a plan view of a crushing device according to another
embodiment of the present invention.
FIG. 6 shows a longitudinally cross-sectional view of the crushing
device as shown in FIG. 5.
BEST MODE FOR CARRYING OUT THE INVENTION
In FIGS. 1 and 2 reference numeral 1 denotes a bucket-shaped body
frame, and reference numeral 2 denotes a crushing shaft provided
at a central portion of the inside of said body frame 1. On the
outer periphery of said crushing shaft 2 are provided plural crushing
teeth 3. At a lower portion of said crushing shaft 2 is fixed an
inclined spiral screw belt 4 whose lower surface has plural projections
5 provided thereon. In this connection, the accompanying Figures
show an embodiment, with only one inclined spiral screw belt shown.
However, it is also possible to employ plural inclined spiral screw
belts in the present invention.
The crushing shaft 2 which is rotated by an oil-hydraulic motor,
is fixed to the frame 1 via a motor rest 7.
Inside of the body frame 1 plural ring members 8 are provided
in such a manner that the ring members 8 fit with step portions
14a of radially-provided ridges 14 with gaps 9 each provided between
adjacent ring members 8 and diminish their sizes from the upper
position toward the lower position, thereby constituting a sieve
A with gaps. On the inner side of each of the ring members 8 are
provided plural fixed teeth 12. The bottom portion of the body frame
1 is left open as a space 19 through which pieces of crushed concrete
are allowed to fall.
A reinforcing bar cutting member 20 is protrusively provided on
a crushing shaft 2 in such a manner that said reinforcing bar cutting
member 20 is located between the motor rest 7 and a teeth plate
18.
The reinforcing bar cutting member 20 not only functions as a reinforcing
bar cutter for cutting reinforcing bars (mixed with concrete) which
have fallen below the teeth plate 18 but also serves a function
of hitting and removing pieces of crushed concrete which have accumulated
on the motor rest 7 during crushing operation. In the drawings,
the ring members 8 are of square cross section. Here, it is also
possible to employ plate-type ring members or adopt ring members
of round cross section.
In the practical crushing operation, large chunks of concrete scooped
into the body frame 1 are crushed by both the crushing teeth 3 provided
on the crushing shaft 2 and the fixed teeth 12 acting from the body
frame side. Pieces of crushed concrete smaller than the gaps each
provided between adjacent ring members 8 8 go it through, pass
through spaces each provided between adjacent radially-provided
ridges 14 reach a bottom space of the body frame 1 and eventually
fall off from the bottom space. Pieces of crushed concrete larger
than the gaps each provided between adjacent ring members 8 8 are
further crushed by the crushing teeth 3 and the fixed teeth 12.
Some of the further crushed pieces go through the gaps each provided
between adjacent ring members 8 8 and others get into a space
between the teeth plate 18 and an inclined screw belt member 4 provided
at a lower portion of the crushing shaft 2. The latter is forced
to get into a space provided at the inner periphery of the teeth
plate 18 so as to be crushed compressively, because there is little
space left below the rear-end part of the screw belt member 4 with
respect to the rotational direction thereof. The compressively crushed
pieces are eventually discharged through the bottom space of the
body frame.
In this way, the combination of the screw belt member 4 and the
teeth plate 18 serves not only the pressing-in and pressing-out
functions but also the crushing function. Protuberances provided
at the lower surface of the screw belt member 4 help to enhance
the efficiency of the crushing operation greatly.
FIG. 5 shows another embodiment wherein elliptical ring members
8a are provided, without employing any ring member of perfect circle.
The elliptical ring members 8 are provided in such a manner that
they gradually increase the elliptic ratio from the lower position
toward the upper position, thereby increasing the volume of the
forward part of the body frame 1. This construction enables scooping
much larger chunks of concrete than the construction using ring
members of perfect circle. Referring to FIG. 4 recessed teeth 15
and protrusive teeth 16 of the teeth plate 18 which are in overlying
relation with recessed teeth 15' and protrusive teeth 16' formed
on a lower base of the body frame 1 can be shifted circumferentially
and fixed by fixing bolts 30. In this manner, each width of the
recessed teeth and the protrusive teeth 16 can be adjusted freely.
In FIG. 2 reference numeral 21 denotes a mesh plate blocking the
bottom of the body frame 1. Fine pieces of concrete fall through
the mesh plate 21 and accumulate on the ground. The mesh plate 21
is detachably mounted at the bottom of the body frame 1 so as to
be detached when the crushing operation is performed without using
it.
As seen from the above, the present invention has made it possible
to freely select the degree of the size of pieces into which chunks
of concrete are to be crushed, and also to obtain very fine pieces
of concrete. The finer the pieces of crushed concrete become, the
greater the scattering efficiency becomes.
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