Solid material comminution or disintegration – Apparatus – Combined or convertible
Reexamination Certificate
2001-09-14
2003-09-16
Rosenbaum, Mark (Department: 3725)
Solid material comminution or disintegration
Apparatus
Combined or convertible
C241S268000
Reexamination Certificate
active
06619576
ABSTRACT:
TECHNICAL FIELD
The present invention relates to an outlet clearance adjustment mechanism for adjusting an outlet clearance between a stationary jaw and a movable jaw of a jaw crusher, and a self-propelled crushing machine loaded with a jaw crusher having the outlet clearance adjustment mechanism.
BACKGROUND ART
An example of a jaw crusher will be explained with reference to a self-propelled jaw crusher
1
shown in FIG.
7
. In
FIG. 7
, a traveling body
2
is loaded with a hopper
3
, a feeder
4
, a jaw crusher
10
, and a belt conveyor
5
. The jaw crusher
10
includes a stationary jaw
11
and a movable jaw
12
swingingly moves relative thereto, which form a V shape with a wide upper portion. A material
6
to be crushed such as a concrete block, rock, stone or the like is charged into the hopper
3
, transferred to an upper portion of the jaw crusher
10
by the feeder
10
, then crushed inside the jaw crusher
10
, and discharged outside from a lower outlet by the belt conveyor
5
to be a product. The grain diameter of a crushed product is determined by an outlet clearance &dgr; between the stationary jaw
11
and the movable jaw
12
. When the stationary jaw
11
and the movable jaw
12
are worn as a result of continuing crushing for a long time, or the grain diameter of the crushed product is to be changed, it is necessary to accurately readjust the outlet clearance &dgr;. Thus, jaw crushers generally include outlet clearance adjustment mechanisms.
Various kinds of outlet clearance adjustment mechanisms of jaw crushers are conventionally proposed, and those disclosed in, for example, Japanese Utility Model Laid-open No. 63-141638, Japanese Utility Model Laid-open No. 63-141639, and International Application Laid-open No. WO97/36683 are well known.
FIG. 8
is a side view of what is disclosed in Japanese Utility Model Laid-open No. 63-141638 as the first example. At a guide
60
provided at a frame
7
, to which the stationary jaw
11
of the jaw crusher
10
is mounted, at a back side of the movable jaw
12
, a toggle block
61
is disposed slidably toward the movable jaw
12
. A tip end portion of a toggle plate
13
abuts a first abutment portion
14
provided at a lower portion of the back of the movable jaw
12
. A base end portion of the toggle plate
13
abuts a second abutment portion
15
provided at a front portion of the toggle block
61
. An oil hydraulic cylinder
64
including a hydraulic mechanical lock device
62
at a piston rod
63
side is fixedly provided at the frame
7
at a back side of the toggle block
61
. A tip end portion of the piston rod
63
abuts the back of the toggle block
61
via a roller
65
. A pre-tension device
20
for always biasing the lower portion of the movable jaw
12
toward the toggle block
61
and holding the toggle plate
13
between the first abutment portion
14
and the second abutment portion
15
is provided between the movable jaw
12
and the frame
7
. The pre-tension device
20
is constituted by a spring
23
held between a bracket
21
fixed to the frame
7
and a washer
24
, and a rod
22
connected to a lower end portion of the moving jaw
12
at one end and penetrating through the spring
23
and the washer
24
and fastened by a nut
25
at the other end. The movable jaw
12
is supported at the frame
7
via an eccentric shaft
16
at an upper end portion, so that rotation of the eccentric shaft
16
swings the movable jaw
12
.
During an operation of the jaw crusher
10
, the hydraulic mechanical lock device
62
is locked. When the outlet clearance between the stationary jaw
11
and the movable jaw
12
is to be adjusted, a worker operates a hydraulic device (not shown) to release the lock of the hydraulic mechanical lock device
62
. Thereafter, the outlet clearance is adjusted by extending or contracting the hydraulic cylinder
64
, and then the hydraulic mechanical lock device
62
is locked again.
FIG. 9
is a side view of what is disclosed in Japanese Utility Model Laid-open No. 63-141639 as the second example. The explanation of the same components as the first example is omitted by giving the identical numerals and symbols, and only the different parts will be explained. An oil hydraulic cylinder
72
including a hydraulic mechanical lock device
71
is horizontally attached at a back side of a U-shaped bracket
70
fixedly provided at the frame
7
at the back side of the movable jaw
12
, and the oil hydraulic cylinder
72
is connected to a rear end portion of a toggle block
73
. An adjustment plate
74
is inserted between the bracket
70
and the toggle block
73
. An upper oil hydraulic cylinder
76
including the hydraulic mechanical lock device
71
is attached upright at a bracket
75
fixedly provided at the frame
7
above the toggle block
73
. The upper oil hydraulic cylinder
76
is connected to the toggle block
73
to pull it upward and fix it. The upper oil hydraulic cylinder
76
is movable in a substantially horizontal direction toward the movable jaw
12
, and is attachably and detachably fastened to the bracket
75
by a bolt
77
.
During an operation of the jaw crusher
10
, the toggle block
73
, the adjustment plate
74
, and the bracket
70
are in close contact with each other, and the hydraulic mechanical lock devices
71
and
71
are locked. When the outlet clearance is to be adjusted, a worker operates a hydraulic device (not shown) to release the lock of the hydraulic mechanical lock devices
71
of the oil hydraulic cylinder
72
and the upper oil hydraulic cylinder
76
. Next, the bolt
77
of the upper oil hydraulic cylinder
76
is loosened to extend the upper oil hydraulic cylinder
76
a little. Subsequently, the oil hydraulic cylinder
72
is extended or contracted to adjust the thickness of the adjustment plate
74
to thereby adjust the outlet clearance, and the oil hydraulic cylinder
72
is contracted to bring the adjustment plate
74
in close contact. Next, the upper hydraulic cylinder
76
is contracted, then the bolt
77
is fastened, and the respective oil hydraulic mechanical lock devices
71
and
71
are locked.
FIG. 10
is a side view of the outlet clearance adjustment apparatus disclosed in International Application Laid-open WO97/36683 as the third example, and
FIG. 11
is a view seen from the arrows
11
—
11
in FIG.
10
. The same components as the first example are given the identical numerals and symbols, the explanation thereof will be omitted, and only the different parts will be explained. In FIG.
10
and
FIG. 11
, a downward inclined plane
31
with a lower portion being protruded is formed on a surface of the toggle block
30
opposite to the toggle plate
13
. A mounting surface
33
for mounting a toggle block
30
thereon slidably toward the movable jaw
12
is provided on a toggle block frame
32
fixedly provided at the frame
7
. Further, an inclined plane
34
matching the aforementioned downward inclined plane
31
of the toggle block
30
is provided on a surface of the toggle block frame
32
opposing the toggle block
30
to form a V-shaped opening portion
35
with the mounting surface
33
. A clearance adjustment shim
36
is inserted between the downward inclined plane
31
of the toggle block
30
and the inclined plane
34
of the toggle block frame
32
. A pair of oil hydraulic cylinders
80
and
80
are attached at the toggle block frame
32
, and piston rods
81
and the toggle block
30
at the side of the downward inclined place
31
are connected by connecting pins
82
. The pre-tension device
20
is provided between the movable jaw
12
and the toggle block frame
32
.
FIG. 12
is an oil hydraulic circuit diagram of the clearance adjustment apparatus of the third example. An output circuit of an oil hydraulic source
83
, and a head side circuit
85
and a bottom side circuit
88
of the oil hydraulic cylinder
80
are connected via an electromagnetic change-over valve
84
. The electromagnetic change-over valve
84
has three positions f, g, and h. The oil hydraulic cylinder
80
is contracted at
Kurohara Motoki
Togashi Ryoichi
Yamada Mitsunobu
Armstrong Westerman & Hattori, LLP
Komatsu Ltd.
Rosenbaum Mark
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