Abstrict There is provided a crusher system drive control apparatus for
a traveling type crushing machine including a vehicle body that
is equipped with a traveling body and that has mounted thereon a
crusher system including a feeder, a crusher and a belt conveyer,
which drive control apparatus comprises an abnormal condition detecting
means for sensing an abnormal stop of the said belt conveyer, and
an operation terminating means in response to a detection signal
that is output by the said abnormal condition detecting means for
stopping an operation of each of the said feeder and the said crusher.
Claims What is claimed is:
1. In a traveling type crushing machine including a vehicle body
that is equipped with a traveling body and that has mounted thereon
a crusher system including a feeder, a crusher and a belt conveyer;
the improvement wherein the crushing machine includes a crusher
system control apparatus, comprising:
an abnormal condition detector for sensing an abnormal stoppage
of said belt conveyer and outputting a detection signal responsive
to sensing of an abnormal stoppage of said belt conveyer; and
an operation terminating section which, in response to said detection
signal that is output by said abnormal condition detector, stops
operation of said feeder and said crusher.
2. The crusher system control apparatus for a traveling type crushing
machine, as set forth in claim 1 comprising:
a feeder switching valve for delivering a pressure fluid to a feeder
driving hydraulic motor driving said feeder;
a crusher switching valve for delivering a pressure fluid to a
crushes driving hydraulic motor driving said crusher;
a belt conveyer switching valve for delivering a pressure fluid
to a belt conveyer driving hydraulic motor driving said belt conveyer,
wherein
said abnormal condition detector comprises a pressure switch that
is responsive to the delivered fluid pressure to said belt conveyer
driving hydraulic motor that exceeds a predetermined pressure value;
and
said operation terminating section comprises an electric circuit
that is responsive to a detection signal which is output by said
pressure switch for driving each of said switching valves to a pressure
fluid delivery stop position in which delivery of pressure fluid
is stopped.
3. The crusher system control apparatus for a traveling type crushing
machine, as set forth in claim 2 in which said electric circuit
comprises:
a switch means that is connected to each of said switching valves
and is responsive to an electrical signal furnished thereto for
switching said each switching valve to one of a pressure fluid delivery
position and said pressure fluid delivery stop position,
a feeder relay connected to said switch means for said feeder switching
valve,
a feeder switch for driving said feeder relay,
a crusher relay connected to said switch means for said crusher
switching valve,
a crusher switch for driving said crusher relay,
a belt conveyer relay connected to said switch means for said belt
conveyer switching valve,
a belt conveyer switch for driving said belt conveyer relay, and
an abnormal condition operative switch which is normally held ON
and arranged in a circuit that connects a self hold contact of each
of said relays with a power supply,
whereby said detection signal from said pressure switch acts on
said abnormal condition operative switch so as to turn it OFF.
4. The crusher system control apparatus for a traveling type crushing
machine, as set forth in claim 3 further comprising:
an emergency stop switch connected in series with said abnormal
condition operative switch in a circuit that connects said self-hold
contact of said relay with said power supply.
5. The crusher system control apparatus for a traveling type crushing
machine, as set forth in claim 3 in which
each of said switch means for said feeder switching valve and said
switch means for said belt conveyer switching valve comprises a
solenoid, and
said switch means for said crusher switching valve comprises a
pilot valve that is adapted to be driven by a solenoid.
6. In a traveling type crushing machine including a vehicle body
that is equipped with a traveling body and that has mounted thereon
a crusher apparatus including a crusher and a belt conveyer, in
which said crusher includes a fixed jaw and a movable jaw that is
reciprocable towards and away from said fixed jaw by means of a
hydraulic motor driving said crusher,
a crusher-driving motor control system comprising
a crusher switching valve for delivering a pressure fluid to said
crusher driving hydraulic motor adapted to be switched from its
neutral position alternatively to a normally rotary position and
a reversely rotary position;
a pilot valve which is driven by a first solenoid and a second
solenoid, respectively, coupled to said crusher switching valve;
and
a switch between a power supply and said second solenoid that is
adapted to switch said pilot valve to a position to drive said crusher
switching valve to said reversely rotary position.
7. The control system with a traveling type crushing machine, as
set forth in claim 6 in which a timer is provided between said
switch and said second solenoid.
8. In a traveling type crushing machine including a vehicle body
that is equipped with a traveling body and that has mounted thereon
a crusher system including a feeder, a crusher and a belt conveyer,
in which said crusher includes a fixed jaw and a movable jaw that
is reciprocable towards and away from said fixed jaw by means of
a hydraulic motor driving said crusher, the improvement wherein
the crushing machine includes a crusher system control apparatus,
comprising:
an abnormal condition detector for sensing an abnormal stoppage
of said belt conveyer and outputting a detection signal responsive
to sensing of an abnormal stoppage of said belt conveyer;
an operation terminating section which, in response to said detection
signal that is output by said abnormal condition detector, stops
operation of each of said feeder and said crusher;
a crusher switching valve for delivering a pressure fluid to said
crusher driving hydraulic motor, adapted to be switched from its
neutral position alternatively to a normally rotary position and
a reversely rotary position;
a pilot valve which is driven by a first solenoid and a second
solenoid, respectively, coupled to said crusher switching valve;
and
a switch between a power supply and said second solenoid that is
adapted to switch said pilot valve to a position to drive said crusher
switching valve to said reversely rotary position.
9. The control apparatus in the traveling type crushing machine,
as set forth in claim 8 said drive control apparatus further comprising:
a feeder switching valve for delivering a pressure fluid to a feeder
driving hydraulic motor driving said feeder; and
a belt conveyer switching valve for delivering a pressure fluid
to a belt conveyer driving hydraulic motor driving said belt conveyer,
in which said abnormal condition detector comprises
a pressure switch that is responsive to the delivered fluid pressure
to said belt conveyer driving hydraulic motor that exceeds a predetermined
pressure value; and
said operation terminating section comprises an electric circuit
that is responsive to a detection signal which is output by said
pressure switch for driving each of said switching valves to a pressure
fluid delivery stop position in which delivery of pressure fluid
is stopped.
10. The control apparatus in the traveling type crushing machine,
as set forth in claim 9 in which said electric circuit comprises:
a switch means that is connected to each of said switching valves
and is responsive to an electrical signal furnished thereto for
switching said each switching valve to one of a pressure fluid delivery
position and said pressure fluid delivery stop position,
a feeder relay connected to said switch means for said feeder switching
valve,
a feeder switch for driving said feeder relay,
a crusher relay connected to said switch means for said crusher
switching valve,
a crusher switch for driving said crusher relay,
a belt conveyer relay connected to said switch means for said belt
conveyer switching valve,
a belt conveyer switch for driving said belt conveyer relay, and
an abnormal condition operative switch which is normally held ON
and arranged in a circuit that connects a self hold contact of each
of said relays with a power supply,
whereby said detection signal from said pressure switch acts on
said abnormal condition operative switch so as to turn it OFF.
11. The control apparatus in the traveling type crushing machine,
as set forth in claim 10 further comprising:
an emergency stop switch connected in series with said abnormal
condition operative switch in a circuit that connects said self-hold
contact of said relays with said power supply.
12. The control apparatus in the traveling type crushing machine,
as set forth in claim 10 in which
each of said switch means for said feeder switching valve and said
switch means for said belt conveyer switching valve comprises a
solenoid, and
said switch means for said crusher switching valve comprises a
pilot valve.
13. The control apparatus in the traveling type crushing machine,
as set forth in claim 8 in which
a timer is interposed between said switch and said second solenoid.
14. The crusher system control apparatus in the traveling type
crushing machine, as set forth in claim 4 in which
each of said switch means for said feeder switching valve and said
switch means for said belt conveyer switching valve comprises a
solenoid, and
said switch means for said crusher switching valve comprises a
pilot valve that is adapted to be driven by a solenoid.
15. The control apparatus in the traveling type crushing machine,
as set forth in claim 11 in which
each of said switch means for said feeder switching valve and said
switch means for said belt conveyer switching valve comprises a
solenoid, and
said switch means for said crusher switching valve comprises a
pilot valve.
Description BACKGROUND
The present invention relates to an apparatus for the drive control
of a crusher system which comprises a feeder, a crusher, a belt
conveyer and so forth in a traveling type crushing machine that
is designed to crush wooden bodies, concrete blocks and so forth
which are produced, e.g., when a building is broken.
BACKGROUND ART
A self traveling type crushing machine has been known, as disclosed,
e.g., in Japanese Unexamined Utility Model Publication No. Sho 64-32744
which has a vehicle body that is equipped with a traveling body
and that has mounted thereon a hopper, a crusher and a conveyer
and in which those objects which are thrown into the hopper are
crushed by the crusher, the crushed pieces being conveyed on the
conveyer and discharged out of the vehicle body.
Such a self traveling crushing machine may be provided with a feeder
for feeding objects to be crushed thrown into the hopper automatically
into the crusher. In such system, the feeder, the crusher and the
belt conveyer are driven by drive sources which are operated independently
of each other, each of these drive sources being then independently
controlledly driven by a feeder switch, a crusher switch and a belt
conveyer switch which are separate from each other.
Such a drive control apparatus is required to operate each of the
switches where it is desired to stop the feeder, the crusher and
the belt conveyer. If the belt conveyer removing the crushed objects
is abnormally stopped, the crusher and the feeder will not be stopped
but continue to be driven. Hence the objects to be crushed remain
to be crushed. This have caused the crushed pieces to accumulate
on the conveyer and may have caused the conveyer to be broken. When
this happens, a time consuming repairing work has been required.
Thus, the prior art has been found problematical in that a crushing
operation tends to be extremely lowered in its efficiency.
Also, a crusher that is employed in the above mentioned self traveling
type crushing machine is typically provided in a housing with a
fixed jaw and a swinging jaw where the swinging jaw is swingingly
reciprocated in the direction of the fixed jaw, thereby crushing
objects to be crushed. Such a crusher is adequate in order to crush
such common things as wooden bodies, concrete blocks and so forth
as produced when a building is broken, but has been found to be
unsatisfactory in dealing with large and high-strength materials
such as fragments of a reinforcing steel and large wooden wastes.
Such objects if charged into the hopper will get locked in between
the fixed and swinging jaws to make the crusher inoperative.
If in this way an object to be crushed is firmly interlocked between
the fixed and swinging jaws and as a result the crusher is stopped,
the crusher will then be stopped in a state in which the swinging
jaw is displaced proximate to the fixed jaw. Thus, an extremely
large force is required in removing such an interlocked object,
such removing operations become extremely laborious and a time consuming
operation is required for removal of such an interlocked object.
Thus, here again, a crushing operation tends to be extremely lowered
in its efficiency.
Especially in the case of a traveling type crushing machine in
which at the outlet of the crusher there are disposed traveling
bodies, a belt conveyer and so forth, there remains a minimum space
for removal below the crusher and it entails quite a troublesome
job in the removal of an interlocked object. For this reason, a
time consuming work is needed for removing an interlocked object.
Hence, the prior art crushing operation has, here again, been found
to be problematical since it tends to be extremely inefficient.
THE INVENTION
The present invention has as an object to obviate these inconveniences
in the prior art and to provide a crusher system drive control apparatus
for a traveling type crushing machine, which apparatus is capable
of eliminating a possible damage of a belt conveyer, facilitates
the removal of an object if it happens to be interlocked in the
crusher, and permits a crushing operation to be carried out efficiently.
Briefly, in accordance with the present invention, in a first general
form of embodiment thereof, a crusher system drive control apparatus
for a traveling type crushing machine including a vehicle body that
is equipped with a traveling body and that has mounted thereon a
crusher system including a feeder, a crusher and a belt conveyer,
which apparatus comprises: an abnormal condition detecting means
for sensing an abnormal stoppage of the said belt conveyer; and
an operation terminating means in response to a detection signal
that is put out by the said abnormal condition detecting means for
stopping an operation of each of the said feeder and the said crusher.
According to this construction, it can be seen that by virtue of
the fact that when a belt conveyer is stopped for some abnormal
reason, the operation of all others of the system units is caused
to halt, there will develop no accumulation of the pieces crushed
on the conveyer, thereby preventing the conveyer belt from being
damaged.
In addition to the construction mentioned above, it should be noted
that the apparatus preferably comprises: a feeder switching valve
for delivering a pressure fluid to a feeder driving hydraulic motor;
a crusher switching valve for delivering a pressure fluid to a crusher
driving hydraulic motor; a belt conveyer switching valve for delivering
a pressure fluid to a belt conveyer driving hydraulic motor; the
said abnormal condition detecting means comprising a pressure switch
that is responsive to the delivered fluid pressure to the said belt
conveyer driving hydraulic motor that exceeds a predetermined pressure
value; and the said operation terminating means comprising an electric
circuit that is responsive to a detection signal which is output
by the said pressure switch for driving each of the said switching
valves to a pressure fluid delivery stop position.
Also, the said electric circuit should preferably comprise: a switch
means that is connected to each of the said switching valves and
is responsive to an electrical signal furnished thereto for switching
the said each switching valve to one of a pressure fluid delivery
position and a said pressure fluid delivery stop position, a feeder
relay connected to a said switch means for the said feeder switching
valve, a feeder switch for driving the said feeder relay, a crusher
relay connected to a said switch means for the said crusher switching
valve, a crusher switch for driving the said crusher relay, a belt
conveyer relay connected to a said switch means for the said belt
conveyer switching valve, a belt conveyer switch for driving the
said belt conveyer relay, and an abnormal condition operative switch
which is normally held on and arranged at a circuit that connects
a self hold contact of each of the said relays with a power supply,
whereby the said detection signal from the said pressure switch
acts on the said abnormal condition operative switch so as to turn
it off.
Also, it is preferred that an emergency stop switch be connected
in series with the said abnormal condition operative switch in a
circuit that connects the said self hold contact of a said relay
with the said power supply.
Further, it is preferable that each of the said switch means for
said said feeder switching valve and said switch means for said
belt conveyer switching valve comprises a solenoid, and that the
said switch means for the said crusher switching valve comprise
a pilot valve that is adapted to be driven with the said solenoid.
The present invention also provides, in a second general form of
embodiment thereof, a crusher system drive control apparatus for
a traveling type crushing machine including a vehicle body that
is equipped with a traveling body and that has mounted thereon a
crusher system including a crusher and a belt conveyer, in which
the said crusher is constituted by a fixed jaw and a movable jaw
that is reciprocatable towards and away from the said fixed jaw
by means of a crusher driving hydraulic motor, in which: a crusher
switching valve for delivering a pressure fluid to the said crusher
driving hydraulic motor is adapted to be switched from its neutral
position alternatively to a normally rotary position and a reversely
rotary position by a pilot valve which is driven by a first solenoid
and a second solenoid, respectively; and a switch is provided between
a power supply and the said second solenoid that is adapted to switch
the said pilot valve to a position that is in turn adapted to drive
the said crusher switching valve to the said reversely rotary position.
According to this construction, by virtue of the fact that since
the said crusher driving hydraulic motor is reversely rotated only
while the above mentioned switch is actuated, it can be seen that
setting the time of actuation of the said switch at a short period
of time will enable the said crusher driving hydraulic motor to
be rotated in a reverse direction for a limited time and hence will
enable the said movable jaw of the said crusher to be displaced
by a short distance away from the said fixed jaw, thereby permitting
an interlocked object to be removed easily.
In addition to the construction mentioned above, it should be noted
that a timer is preferably interposed between the said switch and
the said second solenoid.
The present invention also provides, in a third general form of
embodiment thereof, a crusher system drive control apparatus for
a traveling type crushing machine including a vehicle body that
is equipped with a traveling body and that has mounted thereon a
crusher system including a feeder, a crusher and a belt conveyer,
in which the said crusher is constituted by a fixed jaw and a movable
jaw that is reciprocatable towards and away from the said fixed
jaw by means of a crusher driving hydraulic motor, which apparatus
comprises: an abnormal condition detecting means for sensing an
abnormal stop of the said belt conveyer; and an operation terminating
means in response to a detection signal that is output by the said
abnormal condition detecting means for stopping an operation of
each of the said feeder and the said crusher, and in which apparatus,
a crusher switching valve for delivering a pressure fluid to the
said crusher driving hydraulic motor is adapted to be switched from
its neutral position alternatively to a normally rotary position
and a reversely rotary position by a pilot valve which is driven
by a first solenoid and a second solenoid, respectively; and a switch
is provided between a power supply and the said second solenoid
that is adapted to switch the said pilot valve to a position that
is in turn adapted to drive the said crusher switching valve to
the said reversely rotary position.
In addition to the construction mentioned above, it should be noted
that the drive control apparatus preferably further comprises: a
feeder switching valve for delivering a pressure fluid to a feeder
driving hydraulic motor; and a belt conveyer switching valve for
delivering a pressure fluid to a belt conveyer driving hydraulic
motor, in which preferable apparatus, the said abnormal condition
detecting means comprises a pressure switch that is responsive to
the delivered fluid pressure to the said belt conveyer driving hydraulic
motor that exceeds a predetermined pressure value; and the said
operation terminating means comprises an electric circuit that is
responsive to a detection signal which is output by the said pressure
switch for driving each of the said switching valves to a pressure
fluid delivery stop position.
Also, it is preferred that the said electrical circuit comprise:
a switch means that is connected to each of the said switching valves
and is responsive to an electrical signal furnished thereto for
switching the said each switching valve to one of a pressure fluid
delivery position and a said pressure fluid delivery stop position,
a feeder relay connected to a said switch means for the said feeder
switching valve, a feeder switch for driving the said feeder relay,
a crusher relay connected to a said switch means for the said crusher
switching valve, a crusher switch for driving the said crusher relay,
a belt conveyer relay connected to a said switch means for the said
belt conveyer switching valve, a belt conveyer switch for driving
the said belt conveyer relay, and an abnormal condition operative
switch which is normally held on and arranged at a circuit that
connects a self hold contact of each of the said relays with a power
supply, whereby the said detection signal from the said pressure
switch acts on the said abnormal condition operative switch so as
to turn it off.
Also, it is preferable that an emergency stop switch be connected
in series with the said abnormal condition operative switch in a
circuit that connects the said self hold contact of a said relay
with the said power supply.
Also, it is desirable that each of the said switch means for the
said feeder switching valve and the said switch means for the said
belt conveyer switching valve comprise a solenoid, and that the
said switch means for the said crusher switching valve comprise
a pilot valve.
Further, it is preferred that a timer is provided between the said
switch and the said second solenoid.
BRIEF EXPLANATION OF THE DRAWINGS
The present invention will better be understood from the following
detailed description and the drawings attached hereto showing certain
illustrative embodiments of the present invention. In this connection,
it should be noted that such embodiments as illustrated in the accompanying
drawings are intended in no way to limit the present invention,
but to facilitate an explanation and understanding thereof.
In the accompanying drawings:
FIG. 1 is an entire diagrammatic view illustrating a traveling
type crushing machine including a certain embodiment of the crusher
system drive control apparatus according to the present invention;
FIG. 2 is a circuit diagram illustrating a hydraulic circuit for
controlledly driving a feeder, a crusher and a belt conveyer, constituting
a portion of the above mentioned embodiment of the present invention;
FIG. 3 is a circuit diagram illustrating an electric circuit for
controlledly driving a feeder, a crusher and a belt conveyer, constituting
a portion of the above mentioned embodiment of the present invention;
FIG. 4 is a circuit diagram illustrating another crusher drive
control hydraulic circuit for the above mentioned embodiment of
the present invention; and
FIG. 5 is a circuit diagram illustrating still another crusher
drive control hydraulic circuit for the above mentioned embodiment
of the present invention.
DETAILED DESCRIPTION AND BEST MODES FOR CARRYING OUT THE INVENTION
Hereinafter, suitable embodiments of the present invention with
respect to a crusher system drive control apparatus for a traveling
type crushing machine will be set forth with reference to the accompanying
drawings hereof.
As shown in FIG. 1 a traveling type crushing machine includes
a vehicle body 1. This vehicle body 1 has mounted thereto at both
lower left hand side and lower right hand side a pair of traveling
bodies 2 and has a crusher 3 and a hopper 4 mounted thereon. The
said crusher 3 is provided in a housing 5 with a fixed jaw 6 and
a swing jaw 7 so that by swingingly reciprocating the said swing
jaw 7 towards and away from the said fixed jaw 6 crushing of objects
a to be crushed may be effected between it and the said fixed jaw
6. The said hopper 4 is equipped with a movable bottom plate 9 which
constitutes a feeder 8 so that when the movable bottom plate 9 is
reciprocated the objects to be crushed a may be fed into the said
crusher 3. Between the said pair of traveling bodies 2 on the above
mentioned vehicle body 1 there is mounted a belt conveyer 10 which
is arranged to discharge the crushed pieces b out of the vehicle
body 1.
FIG. 2 shows a hydraulic circuit of a certain embodiment of the
crusher system drive control apparatus according to the present
invention. A pressurized discharge fluid of a first primary hydraulic
pump 20 is designed to be controlledly delivered to a crusher driving
hydraulic motor 22 via a crusher switching valve 21. The said crusher
switching valve 21 is normally held at its neutral position a and
is adapted to be switched to a normally rotary position b and a
reversely rotary position c under a pressurized discharge fluid
of an auxiliary hydraulic pump 24 that is supplied from a pilot
valve 23. The said pilot valve 23 is normally held at its neutral
position and is adapted to be switched to a normally rotary position
e and a reversely rotary position f if a first solenoid 25 and a
second solenoid 26 are electrically energized, respectively.
A pressurized discharge fluid of a second primary hydraulic pump
27 is designed to be controlledly delivered to a feeder driving
hydraulic motor 29 via a feeder switching valve 28. The said feeder
switching valve 28 is normally held at its neutral position g and
is adapted to be switched to a normally rotary position h and a
reversely rotary position i if a first solenoid 30 and a second
solenoid 31 are electrically energized, respectively.
A pressurized discharge fluid of a third primary hydraulic pump
32 is designed to be controlledly delivered to a belt conveyer driving
hydraulic motor 34 and a reservoir 35 via a belt conveyer switching
valve 33. The said belt conveyer switching valve 33 is normally
held at its drain position i and is adapted to be switched to its
supply position k when a solenoid 36 is electrically energized.
A circuit 37 defined between an inlet port 33a of the said conveyer
switching valve 33 and a discharge port 32a of the said primary
pump 32 is provided therein with a pressure switch 38 that is adapted
to be turned on when the discharge pressure of the said third primary
hydraulic pump 32 is in excess of a set pressure at a relief valve
39.
In FIG. 3 there is shown an electrical circuit diagram. In this
electric circuit, a crusher switch 40 a feeder switch 41 and a
belt conveyer switch 42 are each provided with a startup switch
43 and a stop switch 44 that is normally held on. The said stop
switches 44 are connected in series with each other and are also
connected via an emergency stop switch 45 and an abnormal condition
operative switch 46 with a power supply 47. At the same time, each
of the said stop switches 44 is connected via a self hold contact
48a of a crusher relay 48 with a coil 48b, is connected via a self
hold contact 49a of a feeder relay 49 with a coil 49b and is connected
via a self hold contact 50a of a belt conveyer relay 50 with a coil
50b.
A normally open contact 48c of the above mentioned crusher relay
48 is connected to the said first solenoid 25 of the above mentioned
pilot valve 23. A normally open contact 49c of the above mentioned
feeder relay 49 is connected to the said first solenoid 30 of the
above mentioned feeder switching valve 28 and a normally open contact
50c of the above mentioned belt conveyer relay 50 is connected to
the said solenoid 36 and the above mentioned belt conveyer switching
valve 33.
The above mentioned emergency stop switch 45 is normally held on
whereas the above mentioned abnormal condition operative switch
48 is normally held ON and will be turned OFF a predetermined time
after the above mentioned pressure switch 38 is turned ON.
According to this circuit, it should be noted that when neither
the said second solenoid 26 of the above mentioned pilot valve 23
or the said second solenoid 31 of the above mentioned feeder switching
valve 28 is electrically energized, the said crusher hydraulic motor
22 and the feeder hydraulic motor 29 each require only a normal
rotation; hence neither the said second solenoid 26 of the pilot
valve 23 or the said second solenoid 31 of the feeder switching
valve 28 neither needs to be electrically energized.
OPERATION
An explanation will now be given with respect to the operation
of the arrangement previously set forth.
When the said startup switch 43 for the said crusher 40 is turned
on, it can be seen that the said coil 48b of the said crusher relay
48 will be electrically energized to turn on the said self hold
contact 48a, thus permitting the said coil 48b to be connected via
the said self hold contact 48a, the said stop switch 44 the said
emergency stop switch 45 and the said abnormal condition operative
switch 46 to the said power supply 47. This will cause the said
normally open contact 48c to remain on even if the said startup
switch 43 is turned off. Thus, the said crusher relay 48 will have
a self hold function.
This will in turn cause the said pilot valve 23 to be switched
to its normally rotary position e and the said crusher switching
valve 21 to take its normally rotary position b, thus permitting
the pressurized discharge fluid of the said first primary hydraulic
motor 20 to be delivered to the said crusher purpose hydraulic motor
22 thereby causing the latter to be rotationally driven normally
to operate the said crusher 3 to perform a crushing operation.
Now, if the said stop switch 44 is turned off in the above mentioned
state, the communication between the said coil 48b and the said
power supply 47 will be blocked, thus turning the said normally
open contact 48c off to switch the said pilot valve 23 to its neutral
position d. This will cause the said crusher switching valve 21
to be switched to its neutral position a to stop the operation of
the crusher driving hydraulic motor 22. Thus, the crusher 3 will
then be stopped.
Also, when the said startup switch 43 for the said feeder switch
41 and the said startup switch 43 for the said belt conveyer switch
43 are turned on, the said feeder relay 49 and the said belt conveyer
relay 50 will be operated in a similar manner to that as mentioned
previously to rotationally drive the said feeder driving hydraulic
motor 29 and the said belt conveyer driving hydraulic motor 34 each
in a normal direction so as to drive the said feeder and the said
belt conveyer 10. Thus, it can be apparent that both the said feeder
relay 49 and the said belt conveyer relay 50 too, will each have
a self hold function. When the said stop switch 44 is turned off
in this state, the said feeder and the belt conveyer 10 will be
stopped each in a similar manner to that as mentioned previously.
Further, if the said emergency stop switch 45 is turned off while
the said feeder and the said belt conveyer 10 are both being operated
as mentioned above, the self hold function will be removed on each
of the said relay, thus bringing each of the switching valves to
its neutral position. As a result, the said crusher 3 the said
feeder and the said belt conveyer 10 will be emergency stopped substantially
at the same time.
Also, as mentioned above, it can thus be seen that when some abnormality
happens in the belt conveyer 10 so as to cause it to be stopped
while the crusher 3 the feeder and the belt conveyer 10 are being
operated to crush objects a to be crushed and while the crushed
pieces b are being discharged with the conveyer belt 10 the belt
conveyer driving hydraulic motor 34 will be stopped and, since the
pressurized discharge fluid of the said third primary hydraulic
pump 32 then loses its route to advance, an elevated pressure will
thereby be generated at it. Then, when the pressurized discharge
fluid of the said third primary hydraulic pump 32 becomes in excess
of a preset pressure at the said relief valve 39 the said pressure
switch 38 will be turned on.
If the said pressure switch 38 is turned on, it can be noted that
the said abnormal condition operative switch 46 in FIG. 3 will be
turned off a predetermined time thereafter. Then, the said self
hold function will be removed on each relay and each switching valve
will be turned to its neutral position to terminate its respective
hydraulic motor. As a consequence, the said crusher 3 the said
feeder and the said belt conveyer 10 will be stopped.
In this way, by virtue of the fact that when a belt conveyer 10
is stopped for some abnormality or the like reason, the operation
of all others of the crusher system units is caused to halt, it
can be seen that there will develop no accumulation of the pieces
crushed on the conveyer 10 thereby preventing the conveyer belt
from being damaged. Accordingly, any damage that is otherwise possible
will be eliminated and a crushing operation can be carried out satisfactorily
and with efficiency.
At this point it may be noted that a switch which can be turned
on and off by a remote control or a radio control can be incorporated
in a circuit that connects the the said self hold contact of each
relay as mentioned above to the said power supply 47.
FIG. 4 shows another crusher drive control hydraulic circuit according
to the present invention. A pressurized discharge fluid of a primary
hydraulic pump 20 is designed to be controlledly delivered to a
crusher driving hydraulic motor 22 via a crusher switching valve
21. The said crusher switching valve 21 is normally held at its
neutral position a and is adapted to be switched to a normally rotary
position b and a reversely rotary position c each with a pressurized
discharge fluid of an auxiliary hydraulic pump 24 that is supplied
from a pilot valve 23. The said pilot valve 23 is normally held
at its neutral position and is adapted to be switched to a normally
rotary position e and a reversely rotary position f if a first solenoid
25 and a second solenoid 26 are electrically energized, respectively.
The above mentioned first solenoid 25 is connected to a power supply
47 via a relay 57 which is controlled by an actuating switch 43
whereas the above mentioned second solenoid 26 is connected to the
said power supply 47 via a push bottom switch 20 which is normally
biased off by a spring 61. The said switch 60 is adapted to be turned
on by pushing it against the said spring 61.
An explanation will now be given with respect to the operation
of this crusher drive control hydraulic circuit.
The said relay 57 will be turned on by operating the said actuating
switch 43 to electrically energize the said first solenoid 25 which
will then act to switch the said pilot valve 23 to the normally
rotary position e. Then, the said crusher switching valve 21 will,
supplied with the pressurized discharge fluid of the said auxiliary
hydraulic pump 24 at its first pressure receiving portion 21a, assume
to take the normally rotary position b.
This will cause a pressurized discharge fluid of the said primary
hydraulic pump 20 to be supplied to a normal rotation port 22a of
the said crusher purpose hydraulic motor 22 thus permitting the
said swinging jaw 7 of the said crusher 3 to be reciprocated for
crushing objects of crush to be crushed.
Here, when the said actuating switch 43 is operated to stop the
electrical energization of the said first solenoid 25 and when the
said switch 60 is turned on to electrically energize the said second
solenoid 26 it can be seen that the said pilot valve 23 will be
switched to take the reversely rotary position f which will in turn
cause the pressurized discharge fluid of the said auxiliary hydraulic
pump 24 to be delivered to a second pressure receiving portion 21b
of the said crusher switching valve 21 to have it take its reversely
rotary position c.
If this condition is established, it can be seen that the pressurized
discharge fluid of the said primary hydraulic pump 20 will be delivered
to the said crusher driving hydraulic motor 22 at its reverse rotation
port 22b to cause this motor 22 to be reversely rotated, thus permitting
the said swinging jaw 7 of the crusher 3 to be displaced by a short
distance away from the said fixed jaw 6.
Accordingly, in a case where an object has been interlocked between
the said fixed jaw 6 and the swinging jaw 7 the operation of the
actuating switch 43 to terminate the electrical energization of
the said first solenoid 25 and subsequently turning the said switch
60 on several times as mentioned previously will cause the said
swinging jaw 7 to be moved by a short distance away from the said
fixed jaw 6. Then, the interlocked object will be allowed to drop
by its own gravity or can be removed with a small external force.
FIG. 5 shows still another embodiment of the crusher drive control
hydraulic circuit. In this embodiment, a timer 62 is shown as interposed
between the said switch 60 and the said second solenoid 26. With
this arrangement, since the said second solenoid 26 remains energized
for a predetermined period of time after the said switch 60 is turned
on, it can be seen that the said swinging jaw 7 will be displaced
by a predetermined distance away from the said fixed jaw 6.
As set out above, according to the two preceding embodiments of
the crusher drive control hydraulic circuit, it should be apparent
that by virtue of the fact that since the said crusher driving hydraulic
motor 22 is reversely rotated only while the switch 22 is actuated,
setting the time of actuation of the said switch 22 at a short period
of time will enable the said crusher driving hydraulic motor 22
to be rotated in a reverse direction for a limited distance and
hence will enable the said swinging jaw 7 of the said crusher 3
to be displaced by a short distance away from the said fixed jaw
6 thereby permitting an interlocked object to be removed easily.
Therefore, the removal of an interlocked object is never time consuming
and hence a crushing operation is carried out most efficiently.
While the present invention has hereinbefore been described with
respect to certain illustrative embodiments thereof, it will readily
be appreciated by a person skilled in the art to be obvious that
many alterations thereof, omissions therefrom and additions thereto
can be made without departing from the essence and the scope of
the present invention. Accordingly, it should be understood that
the present invention is not limited to the specific embodiments
thereof set out above, but includes all possible embodiments thereof
that can be made within the scope with respect to the features specifically
set forth in the appended claims and encompasses all equivalents
thereof. |