Solid material comminution or disintegration – Apparatus – Combined or convertible
Reexamination Certificate
2002-07-11
2004-08-10
Rosenbaum, Mark (Department: 3725)
Solid material comminution or disintegration
Apparatus
Combined or convertible
C241S234000
Reexamination Certificate
active
06772969
ABSTRACT:
RELATED APPLICATIONS
This application relates to and claims a priority from corresponding Japanese Patent Application No. 2001-212245 filed on Jul. 12, 2001.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a break roll machine for breaking such grains as wheat grains, and more particularly to a break roll machine in which the replacement of the rolls can be performed with ease.
2. Description of the Related Art
As a break roll machine which is used in a flour milling plant, a multiple roll machine, as shown in
FIG. 5
, in which two sets of a pair of rolls
102
,
103
are arranged in a machine frame
101
is well known in the art. The multiple break roll machine
100
is divided into two by a center partition board
104
so that two sets of the pair of rolls
102
,
103
operate independently with each other. For example, the machine illustrated in
FIG. 5
is divided into two parts, one being the coarse roll side
107
at which the operation of breaking and developing of the stock of raw materials is performed and the other one being the smooth roll side
108
at which the frictional breaking of the stock is performed. Further, the break roll machine
100
is provided with a differential transmission mechanism
109
(see the coarse roll side
107
) for causing the pair of rolls
102
and
103
to rotate respectively inwardly at the different peripheral speeds. The roll machine
100
is also provided with a roll gap adjusting mechanism
110
for adjusting a nip or gap defined between the pair of rolls
102
and
103
.
In the break roll machine
100
as described above, with the lapse of time, there develops wear of the coarse rolls, the surface of the smooth rolls becomes rough, the rolls lose their roundness, and the pear surface of the rolls becomes too smooth due to the wear. Therefore, the surfaces of the rolls
102
and
103
are required to be coarse or grinded or polished. In performing the maintenance, it is effective that the used rolls are replaced by the spare rolls sequentially according to a predetermined schedule. Although the appropriate timings of the roll replacement depend on such conditions as the locations of the rolls, the materials of rolls, kinds of raw materials, the tightening degree of the rolls, and the degree of load, span of period may be between four months to one year for the coarse rolls and between six months to two years for the smooth rolls.
Hereunder, actual operation for replacement of the rolls is explained. When the pair of rolls
102
and
103
are to be removed from the machine frame
101
, it is necessary that the drive-transmission means such as belts be first removed or disassembled from the main drive means. The drive-transmission means includes, for example, a V-belt (not shown) and V-belt pulleys which connect between a drive motor (not shown either) as the drive source and the rolls (
102
and/or
103
). Since such V-belt pulleys are generally mounted on the end portions of the motor drive shaft and the roll driven shaft and the width of the V-belt is small, possibility of interference of these components with other components or their projection portions is small. As a result these components can be easily removed or disassembled by simply loosening the tension applied thereto.
On the other hand, a timing belt
111
of the differential transmission mechanism
109
shown in
FIG. 5
has a wide width configuration, the removal or disassembling of the same is fairly difficult. The differential transmission mechanism
109
is constituted by timing-belt pulleys
112
,
113
respectively mounted on the rolls
102
,
103
; an idler pulley
114
; the timing belt
111
of the wide width configuration wound on the timing-belt pulleys
112
,
113
and the idler pulley
114
; a tension arm
115
on which the rotary axis of the idler pulley
114
is received; and a tension mechanism
116
which applies an appropriate tension to the timing belt
111
based on the rotation of the same. Where the timing belt
111
wound on the timing-belt pulleys
112
,
113
and the idler pulley
115
is to be removed, a rod
116
a
is contracted by the operation of the tension mechanism
116
so that the tension arm
115
is pivotally rotated in the direction of left, namely, in the arrow direction in the drawings. In this way, the timing belt
111
is loosened. Next, since the pivot
115
a
of the tension arm
115
is secured to the lower portion
104
a
of the center partition board
104
by bolts, these bolts are removed and, then, the tension arm
115
itself is removed from the machine frame
101
. Thereafter, the timing-belt
111
of the wide width configuration is removed from the timing-belt pulleys
112
,
113
and the idler pulley
114
.
After the removal of the drive-transmission means such as the V-belt and timing belts from the main drive means, the pair of rolls
102
,
103
are removed from the machine frame
101
. However, between the rolls
102
,
102
and the machine frame
101
, there is further connected a roll gap adjusting mechanism
110
. The Japanese Patent Application Kokai-Publication No. Hei 8-206,522 discloses a roll pack of the pre-assembled module construction as shown in
FIG. 6
in which the rolls
102
and
103
are mounted in advance in a movable bearing housing
117
and a fixed bearing housing
118
, respectively. In this case, by disconnecting the circular-coupling between an arm rod
120
of the roll gap adjusting mechanism
110
and an air cylinder
121
and, further, by removing the fastening bolts
122
,
123
and
124
, the pre-assembled roll pack module
119
can be removed from the main frame
101
in a short time and new one can be installed in a short time with ease.
However, among the bolts for firmly fixing the roll pack module
119
to the machine frame
101
, there is a bolt
124
(see FIG.
6
), for example, which is located behind the air cylinder
121
and to which it is difficult to access to head portion of the bolt by tools such as a spanner and a box wrench because the air cylinder
121
interferes with such tools. To cope with this problem, in order to remove the fastening bolt
124
, it has been necessary that the air cylinder
121
is inclined left or right (as shown in two-dotted line in FIG.
6
), or the air cylinder itself is once removed entirely from the machine frame
101
.
Further, as shown in
FIG. 5
, when the wide width timing-belt
111
is to be removed from the pulleys
112
,
113
and the idler pulley
114
, the tension arm
115
itself should be removed from the machine frame
101
. In this case, since the number of the bolts to be removed is large, there has been a problem that such operation is troublesome and time-consuming.
SUMMARY OF THE INVENTION
One object of the present invention is to over-come the above explained problems in the prior art.
Another object of the present invention is to provide a break roll machine in which a timing belt of a differential transmission mechanism can be removed easily, a pre-assembled roll pack module can be removed from a machine frame in a short time and a new roll pack module can be reinstalled in a short time with ease.
According to one aspect of the invention, there is provided a break roll machine having: a fixed roll bearing housing fixed to a machine frame; a movable roll bearing housing which is movable nearer or further with respect to the fixed roll bearing housing; a pair of break rolls rotatably held by the fixed roll bearing housing and the movable roll bearing housing, respectively; a roll gap adjusting mechanism provided between the fixed roll bearing housing and the movable roll bearing housing, for adjusting a gap defined between the pair of break rolls; and a differential transmission mechanism for causing the pair of break rolls to rotate respectively inwardly at different circumferential speeds with each other, the differential transmission mechanism characterized by comprising:
timing-belt pulleys mounted to rotary shafts of the pair of break rolls, respectively;
a timing belt wound on
Hisamitsu Yasushi
Kawano Hiroyuki
Miyaji Makoto
Tokui Yoshihiro
Uebayashi Shigeki
Rosenbaum Mark
Satake Corporation
Wells St. John P.S.
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