Abrading – Accessory – Guard or housing
Reexamination Certificate
1999-10-25
2001-07-31
Rose, Robert A. (Department: 3723)
Abrading
Accessory
Guard or housing
C125S013010
Reexamination Certificate
active
06267657
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a grinding swarf collector designed to satisfactorily collect swarf discharged during grinding of an internal surface of piping.
2. Description of the Related Art
An example of a conventional grinding swarf collector is shown in FIG.
7
. This device shown in
FIG. 7
is a cutter for an inner peripheral surface of a cylindrical structure, the device being disclosed in Japanese Unexamined Patent Publication No. 61-114083. Collection of swarf in this device will be described.
In
FIG. 7
, J denotes an induction electric furnace,
101
denotes a refractory lining of the induction electric furnace,
102
denotes an induction heating coil embedded in the refractory lining
101
, and K denotes an inner peripheral surface cutter concerned with an earlier technology.
The inner peripheral surface cutter K is composed of a cover
110
for covering an upper opening
103
of the induction electric furnace J; a swivel joint
112
fixed onto the cover
110
via a bracket
111
; a strut
114
having an upper end fixed to a turning-side member of the swivel joint
112
, and having a lower end passing through the cover
110
and extending near a furnace bottom of the induction electric furnace J, and having a C-shaped cross section because of an axial slit
113
formed in a side wall surface thereof; a first motor M
1
, disposed on an upper surface of the cover
110
, for imparting a rotational driving force to the strut
114
via a gear transmission mechanism
115
; a screw member
117
disposed inside the strut
114
coaxially with the strut
114
, having an upper end fixed to a stationary-side member of the swivel joint
112
, and having a lower end borne by a lower end portion of the strut
114
via a bearing
116
; a nut member
118
screwed to the screw member
117
; an arm member
119
inserted slidably into the slit
113
, having a base end portion secured to the nut member
118
, and having a front end portion protruding from the strut
114
; a gear-like rotary cutting tool
120
attached rotatably to a front end of the arm member
119
; and a second motor M
2
, disposed on the arm member
119
, for imparting a rotational driving force to the rotary cutting tool
120
via a gear transmission mechanism
121
.
A cutting operation for an inner peripheral surface of a cylindrical structure by the so constituted inner peripheral surface cutter, i.e., a cutting operation for the refractory lining
101
as the inner peripheral surface of the induction electric furnace J, will be described below. In an initial state, the nut member
118
is situated at the uppermost end of the screw member
117
.
As shown in
FIG. 7
, the strut
114
is inserted into the induction electric furnace J. The upper opening
103
of the induction electric furnace J is covered with the cover
110
whose position is adjusted so that the strut
114
is located at the center of the induction electric furnace J. In this state, the second motor M
2
is rotated in a predetermined direction. A rotational driving force of the motor M
2
is transmitted to the rotary cutting tool
120
via the gear transmission mechanism
121
, whereupon the rotary cutting tool
120
begins to make a rotation about its own axis. Furthermore, the first motor M
1
is rotated in a predetermined direction. A rotational driving force of the motor M
1
is transmitted to the strut
114
via the gear transmission mechanism
115
, whereupon the strut
114
rotates. A rotation motion of the strut
114
is transmitted to the nut member
118
via the arm member
119
which is slidable relative to the slit
113
. The nut member
118
rotates while being screwed on the screw member
117
. Thus, the nut member
118
descends along an axial direction of the screw member
117
integrally with the arm member
119
. Hence, the rotary cutting tool
120
rotates on its own axis at the front end of the arm member
119
, and also makes a rotation about the strut
114
, with the arm member
119
defining a turning radius. Furthermore, the rotary cutting tool
120
descends along an axial direction of the strut
114
. Thus, the rotary cutting tool
120
descends, while making a spiral movement, along the inner peripheral surface of the induction electric furnace J to cut the entire inner peripheral surface of the refractory lining
101
of the induction electric furnace J, where an erosion or the like has occurred, to a desired depth. A large amount of dust or the like, which occurs during this process, is prevented from scattering to the outside of the induction electric furnace J, since the upper opening
103
of the induction electric furnace J is covered with the cover
110
.
Besides, the inner peripheral surface cutter K for a cylindrical structure related to the earlier invention is constituted as follows: An opening
130
is formed at a lower end of the strut
114
. Piping
131
leading to an external dust collector is connected to the stationary-side member of the swivel joint
112
to make the strut
114
serve as an intake pipe
114
′. Further, an opening
132
is formed in the cover
110
, and piping
133
leading to the above dust collector is connected to this opening
132
as well. Under the action of the intake pipe
114
′ and the pipings
131
,
133
, large amounts of swarf and dust, which have occurred in the induction electric furnace J during the cutting operation for the refractory lining
101
, are sucked and discharged to the outside, and treated by the dust collector, etc.
According to the conventional swarf collection technique described above, swarf falling by the action of gravity is sucked and collected. If a cylinder to the processed is placed in a horizontal position or at an angle close to the horizontal, swarf does not reach suction ports, and cannot be collected. The device according to the earlier invention, moreover, is directed at processing a large structure with an internal diameter of 5 meters or more, such as an inner wall of an electric furnace. Thus, it has been unable to collect swarf in a bottlenecked portion with a piping internal diameter of about 10 cm.
SUMMARY OF THE INVENTION
The present invention has been accomplished in view of the above-described problems with the earlier technology. It is an object of the invention to provide a grinding swarf collector capable of collecting swarf efficiently while preventing its scattering.
To attain the above object, an aspect of the present invention is a grinding swarf collector, comprising:
a cover for covering an outer peripheral surface and side surfaces of a grinding wheel, except a site of grinding by the grinding wheel;
a suction mechanism, located behind a grinding point in a direction of rotation of the grinding wheel, for sucking swarf; and
a dust collecting plate, located behind the grinding point in the direction of rotation of the grinding wheel, for guiding scattered swarf to the suction mechanism.
According to this aspect of the invention, swarf scattered rearward of the grinding point is scooped up with the dust collecting plate, and sucked into the suction mechanism. Swarf scattered around the grinding wheel collides with the cover, falls to an opening of the cover (the site of grinding), and is then sucked in to the suction mechanism. In this manner, swarf can be collected reliably.
Another aspect of the present invention is a grinding swarf collector, comprising:
a cover for covering an outer peripheral surface and side surfaces of a grinding wheel, except a site of grinding by the grinding wheel;
a suction mechanism, located behind a grinding point in a direction of rotation of the grinding wheel, for sucking swarf;
a dust collecting plate, located behind the grinding point in the direction of rotation of the grinding wheel, for guiding scattered swarf to the suction mechanism; and
an air blowing mechanism for blowing air toward the suction mechanism, with the grinding point being interposed between the air blowing mechanism and the suction mechanism.
According t
Kanai Yasuhiro
Tawara Satoshi
Yasukura Hiroshi
Mitsubishi Heavy Industries Ltd.
Rose Robert A.
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