Solid material comminution or disintegration – Apparatus – Cooperating comminuting surfaces
Reexamination Certificate
2002-07-18
2003-11-11
Husar, John M. (Department: 3725)
Solid material comminution or disintegration
Apparatus
Cooperating comminuting surfaces
C241S267000
Reexamination Certificate
active
06644577
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a jaw crusher, and particularly to a movable jaw holding mechanism, and an adjusting mechanism for a tip clearance between a movable jaw and a stationary jaw.
BACKGROUND ART
Various proposals have been conventionally made for the structure of a jaw crusher, and as examples thereof, those disclosed in Japanese Patent Application Publication No. 5-45300 and Japanese Patent Application Laid-open No. 10-249224, are cited.
FIG. 8
is an explanatory view in a side section of a crusher disclosed in Japanese Patent Application Publication No. 5-45300. Inside a crusher main body
60
, a swing jaw
61
, having a movable jaw
5
, is suspended from an eccentric shaft
62
, and a stationary jaw
3
is attached to oppose it. A lower end portion of a toggle block
63
is rotatably attached to the crusher main body
60
with a pin
64
. A base end portion of a hydraulic actuator
70
having a frictional force utilizing close fit of a sleeve and a cylinder rod is swingably attached to the crusher main body
60
, and its tip end portion is rotatably attached at an upper end portion of the toggle block
63
with a pin
65
.
An adjusting hydraulic cylinder
71
is provided in series at a rear end portion of the hydraulic actuator
70
. Toggle sheets
66
and
66
each having a groove portion are provided at a lower end portion of the swing jaw
61
and at a center portion of the toggle block
63
, and a toggle plate
67
is inserted between the groove portions of both the sheets
66
and
66
with both end portions being slidable. A spring
68
is biased so that the swing jaw
61
and the toggle block
63
always hold the toggle plate
67
between them.
Hydraulic pressure of the adjusting hydraulic cylinder
71
is adjusted at a predetermined set pressure during a crushing operation so that the cylinder rod of the hydraulic actuator
70
is held at an arbitrary position by a frictional force of the sleeve and the cylinder rod, and a clearance between tip end portions of the movable jaw
5
and the stationary jaw
3
is maintained.
FIG. 9
is an explanatory view of a sectional side view of a jaw crusher disclosed in Japanese Patent Application Laid-open No. 10-249224. A swing jaw
61
having the movable jaw
5
is swingably suspended at an eccentric shaft
62
attached at upper portions of left and right side frames
80
and
80
, and the stationary jaw
3
is fixedly provided at the side frame
80
to oppose it to form a crushing chamber
6
. A toggle block
63
is attached to the side frame
80
by a block support shaft
81
with its base end portion being rotatable. A window
82
having a semicircular portion is provided near a tip end portion of the toggle block
63
at the side frame
80
, a semicircular disc-shaped load supporting plate
83
is fitted in the window
82
, and a set adjusting plate
84
for adjusting an outlet clearance of the crushing chamber
6
is provided between the load supporting plate
83
and the toggle block
63
.
Toggle sheets
66
and
66
each having a groove portion are attached to a lower end portion of the swing jaw
61
and the toggle block
63
. A toggle plate
67
is provided between groove portions of both the sheets
66
and
66
so that both ends thereof are slidable, and the lower end portion of the swing jaw
61
is always biased to the toggle block
63
by a spring
85
. The toggle block
63
and the side frame
80
are connected by a bare rock type of hydraulic cylinder
86
, the toggle block
63
is rotated by a hydraulic cylinder
86
at the time of adjusting the outlet clearance of the crushing chamber
6
, and a clearance is provided between the toggle block
63
and the load supporting plate
83
so that the thickness of the set adjusting plate
84
is adjusted.
However, the above-described structures have the following disadvantages.
In the structure disclosed in Japanese Patent Application Publication No. 5-45300, the toggle sheets
66
and
66
are attached to the lower end portion of the swing jaw
61
and the toggle block
63
, and the toggle plate
67
is held between both the sheets
66
and
66
to receive a load during crushing. Accordingly, the toggle plate
67
is sandwiched, and the spring
68
is used to hold it, which makes the structures complicated and requires adjustment of the spring
68
each time the tip clearance is adjusted, thus increasing adjustment time. In addition, when they are mounted on vehicles, operating spaces become narrow, which makes adjusting operations themselves difficult.
Since the adjusting hydraulic cylinder
71
is provided at the rear end portion of the hydraulic actuator
70
, the total length of the hydraulic cylinder part is long, and since it is horizontally arranged, a total length N of the jaw crusher
61
shown in
FIG. 8
is long, which makes a space area large to cause the disadvantage when mounted on a vehicle and the like. Since pressure is always applied to the adjusting hydraulic cylinder
71
, energy is wasted. Further, oil leakage occurs, which makes it unstable. A complicated hydraulic circuit structure is necessary to prevent the oil leakage, which makes it expensive.
In the structure disclosed in Japanese Patent Application Laid-open No. 10-249224, as in the structure described above, the toggle plate
67
is sandwiched, and the spring
85
is used to hold it, which makes the structures complicated and requires adjustment of the spring
85
each time the tip clearance is adjusted, thus increasing adjustment time. In addition, when they are mounted on vehicles, operating spaces become narrow, which makes adjusting operations themselves difficult. Further, it adopts the method of preventing breakage of the other components by the toggle plate
67
being bent under excessive load, and a replacement operation of the bent toggle plate
67
is difficult, thus requiring a great deal of time. Furthermore, since adjustment of the outlet clearance of the crushing chamber
6
is made with the set adjustment plate
84
, a great deal of time is required for adjustments and thus operation efficiency is low.
SUMMARY OF THE INVENTION
The present invention is made in view of the above-described disadvantages, and has its object to provide a compact and light-weight jaw crusher in which life span of parts enduring abrasion is long, a structure is simple, less part is damaged under excessive load with excellent operation efficiency, greater economy is obtained with no energy loss, and an outlet clearance of a crushing chamber is easily adjusted.
In order to attain the above-described object, a first aspect of the jaw crusher according to the present invention is a jaw crusher has the structure including
a stationary jaw fixedly provided at a frame,
a movable jaw which is provided to oppose the stationary jaw and attached swingably with an eccentric drive shaft,
a movable jaw load receiving section attached to the frame, and
a coupling joint which is a connecting member for connecting a lower portion of the movable jaw and the movable jaw load receiving section and swingably connects the lower portion and the movable jaw load receiving section.
According to the above structure, instead of the toggle plate conventionally used, which has a sandwiching structure, the swingable coupling joint, which never comes off and falls, is used for the connecting member for the lower end portion of the movable jaw which receives load during compression crushing of the jaw crusher and the movable jaw load receiving section attached to the frame. Consequently, since the attached spring is not needed, the structure is simplified, and the tip clearance adjusting time can be shortened. Further, the lubrication at the connecting portion is secured, and the frequency of maintenance is reduced with less abrasion, thus improving operation efficiency.
Further, in the jaw crusher, the movable jaw load receiving section may have a structure forming a rotatable link mechanism including a hydraulic cylinder with a close fit mechanism.
According to the above structure, relative movemen
Togashi Ryoichi
Yamada Mitsunobu
Husar John M.
Kananen Ronald P.
Komatsu Ltd.
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