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Abstract:

A pipe chamfering device for chamfering an opening of a metal pipe has a
secured member, a sliding member mounted on the secured member, and a
chamfer cutting tool apron mounted on the sliding member. The secured
member is secured onto a rotating plate, and a dovetail block is formed
on a front side of the secured member. The sliding member has a dovetail
slot on a rear side mounted correspondingly with and sliding along the
dovetail block of the secured member. The sliding member has an axial
aperture, and an axial rod is disposed in the axial aperture. A front end
of the axial rod extends from a front side of the sliding member and is
connected to a roller. The chamfer cutting tool apron has a chamfer
cutting tool, and the chamfer cutting tool apron is mounted on the strip
slot of the sliding member. The chamfer cutting tool is able to be driven
by the rotating plate and is capable of forming a weld root with an even
thickness at an opening of a non-circular pipe.

Claims:

1. A pipe chamfering device for chamfering an opening of a metal pipe
comprising: a secured member secured onto a rotating plate and having a
hollow section through front and rear side faces and through apertures at
upper and lower ends of the secured member connected to the hollow
section, each through aperture accepting a spring, a threaded section
formed at an outer end of each through aperture for engaging with a bolt,
and a dovetail block formed on a front side of the secured member; a
sliding member having a dovetail slot on a rear side mounted
correspondingly with and sliding along the dovetail block of the secured
member, the sliding member having an axial aperture, an axial rod
disposed in the axial aperture, a front end of the axial rod extending
from a front side of the sliding member and connected to a roller, an
inclined face formed at a front edge of the roller, a rear end of the
axial rod extending into the hollow section of the secured member and
forming a rectangular block, the rectangular block respectively
compressed by the springs in the secured member, and a strip slot
disposed on the sliding member; and a chamfer cutting tool apron having a
chamfer cutting tool, the chamfer cutting tool apron mounted on the strip
slot of the sliding member, the chamfer cutting tool apron capable of
adjusting a gap on the strip slot between the chamfer cutting tool and
the roller.

2. The pipe chamfering device as claimed in claim 1 further comprising a
deburring cutting tool apron, the deburring cutting tool apron installed
below the chamfer cutting tool apron with a threaded member, the
deburring cutting tool apron having a deburring cutting tool, the
deburring cutting tool apron utilizing the threaded member to adjust a
gap between the deburring cutting tool and the chamfer cutting tool such
that the deburring cutting tool of the deburring cutting tool apron is
capable of deburring a pipe opening of a metal pipe.

3. The pipe chamfering device as claimed in claim 1 further comprising a
weld root reshaping apron installed on the rotating plate, the weld root
reshaping apron having a weld root reshaping tool such that the weld root
reshaping tool of the weld root reshaping apron is capable of reshaping a
weld root of the metal pipe.

Description:

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a pipe chamfering device, and more
particularly to a pipe chamfering device which is capable of forming a
weld root with an even thickness at an opening of a non-circular pipe.

[0003] 2. Description of the Related Art

[0004] In order to improve the strength of welded connections between
metal pipes and to improve the penetrating ability of the welding
materials, it is necessary to perform a chamfering process to the pipe
metal to form a weld root on the opening edge of the metal pipe.

[0005] Typical pipe chamfering devices (such as disclosed in Taiwan design
patent No. M317897) comprise a cutting tool on a rotating plate, with
rotation provided by the rotating plate. The cutting tool is driven to
chamfer the pipe opening of the metal pipe.

[0006] However, the above-mentioned pipe chamfering device has the cutting
tool placed directly on the rotating plate and driven directly by the
rotating plate. Therefore, when the pipe opening of the metal pipe is not
circular, the weld root formed by the chamfering process may have an
uneven thickness even if the pipe opening is pre-processed for a shape
that is more circular, with the result that the penetrating ability of
the welding materials and the strength of the welded connection are both
affected.

[0007] Therefore, it is desirable to provide a pipe chamfering device to
mitigate and/or obviate the aforementioned problems.

SUMMARY OF THE INVENTION

[0008] An objective of the present invention is to provide a pipe
chamfering device which is capable of forming a weld root with an even
thickness at an opening of a non-circular pipe.

[0009] In order to achieve the above-mentioned objective, the pipe
chamfering device has a secured member, a sliding member, a chamfer
cutting tool apron, a deburring cutting tool apron and a weld root
reshaping apron. The secured member is secured onto a rotating plate and
has a hollow section through front and rear side faces and through
apertures at upper and lower ends of the secured member connected to the
hollow section. Each through aperture accepts a spring, a threaded
section formed at an outer end of each through aperture for engaging with
a bolt, and a dovetail block formed on a front side of the secured
member.

[0010] The sliding member has a dovetail slot on a rear side mounted
correspondingly with and sliding along the dovetail block of the secured
member. The sliding member has an axial aperture, and an axial rod is
disposed in the axial aperture. A front end of the axial rod extends from
a front side of the sliding member and is connected to a roller, and an
inclined face is formed at a front edge of the roller. A rear end of the
axial rod extends into the hollow section of the secured member and forms
a rectangular block, and the rectangular block is respectively compressed
by the springs in the secured member. Furthermore, a strip slot disposed
on the sliding member.

[0011] The chamfer cutting tool apron has a chamfer cutting tool, the
chamfer cutting tool apron is mounted on the strip slot of the sliding
member, and the chamfer cutting tool apron is capable of adjusting a gap
on the strip slot between the chamfer cutting tool and the roller.

[0012] Other objects, advantages, and novel features of the invention will
become more apparent from the following detailed description when taken
in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0013] FIG. 1 is an exploded perspective view of an embodiment of the
present invention.

[0014] FIG. 2 is an assembled perspective drawing of an embodiment of the
present invention.

[0015]FIG. 3 is a cross-sectional view of an embodiment of the present
invention.

[0016]FIG. 4 is a cross-sectional view of a roller being pushed by a
metal pipe, sliding into the pipe and pushing against an inner wall of
the pipe opening.

[0017] FIG. 5 is a detailed view of a region in the cross-sectional view
of FIG. 4.

[0018]FIG. 6 is a cross-sectional view of a roller pushing against an
inner wall of a pipe opening while a rotating plate is rotating; a
chamfer cutting tool of a chamfer cutting tool apron chamfering the
opening of the metal pipe; and a deburring cutting tool of a deburring
cutting tool apron deburring the opening edge of the metal pipe.

[0019]FIG. 7 is a cross-sectional drawing along a line I-I shown in FIG.
6.

[0020]FIG. 8 is a cross-sectional view of a weld root reshaping tool of a
weld root reshaping apron driven by a rotating plate reshaping a metal
pipe.

[0021]FIG. 9 is a cross-sectional drawing along a line II-II shown in
FIG. 8.

[0022]FIG. 10 is a schematic drawing of the chamfering of a pipe opening
of a metal pipe to form a bevel and weld root.

[0024] The secured member 10, with reference to FIG. 3, is secured onto a
rotating plate 60 and has a hollow section 11 through its front and rear
side faces and through apertures 12A, 12B at upper and lower ends of the
secured member 10 that connect to the hollow section 11. Each through
aperture 12A, 12B accepts a spring 13A, 13B, and a threaded section 14A,
14B is formed along an outer end of each through aperture 12A, 12B for
engaging with a bolt 15A, 15B. A dovetail block 16 is formed on a front
side of the secured member 10.

[0025] The sliding member 20, with reference to FIG. 3, has a dovetail
slot 21 on a rear side that mounts correspondingly with and slides along
the dovetail block 16 of the secured member 10. The sliding member 20
further has an axial aperture 22. An axial rod 23 is disposed in the
axial aperture 22, and a front end of the axial rod 23 extends from a
front side of the sliding member 20 and connects to a roller 24. An
inclined face 241 is formed on a front edge of the roller 24. A rear end
of the axial rod 23 extends into the hollow section 11 of the secured
member 10 and is shaped as a rectangular block 25. The rectangular block
25 is respectively compressed by the two springs 13A, 13B in the secured
member 10, and a strip slot 26 is disposed on the sliding member 20.

[0026] The chamfer cutting tool 31 and the chamfer cutting tool apron 30
are mounted on the strip slot 26 of the sliding member 20; Using the
strip slot 26, the chamfer cutting tool apron 30 is capable of adjusting
a gap between the chamfer cutting tool 31 and the roller 24.

[0027] The deburring cutting tool apron 40, with reference to FIG. 3, is
installed below the chamfer cutting tool apron 30 with a threaded member
41. The deburring cutting tool apron 40 has a deburring cutting tool 42,
and the deburring cutting tool apron 40 utilizes the threaded member 41
to adjust a gap between the deburring cutting tool 42 and the chamfer
cutting tool 31.

[0028] The weld root reshaping apron 50, with reference to FIG. 3, is
installed on the rotating plate 60, and the weld root reshaping apron 50
has a weld root reshaping tool 51.

[0029] With the above-mentioned structure, as shown in FIG. 4, when a
chamfering process is performed to a metal pipe 70, the rotating plate 60
is pushed towards the metal pipe 70 to cause the inclined face 241 of the
roller 24 to push against the pipe opening of the metal pipe 70. The
roller 24 is pushed by the pipe opening of the metal pipe 70 and slides
into the inside of the metal pipe 70 such that outer edge of the roller
24 pushes against the inner wall of the opening of the metal pipe 70 (as
shown in FIG. 5). Next, as shown in FIGS. 6 to 9, the rotating plate 60
is continuously pushed such that the opening of the metal pipe 70
contacts the chamfer cutting tool 31 of the chamfer cutting tool apron
30. With the rotation provided by the rotating plate 60, the chamfer
cutting tool 31 of the chamfer cutting tool apron 30 performs the
chamfering process upon the pipe opening of the metal pipe 70 to form a
bevel 71 and shapes the pipe opening of the metal pipe 70 to form a weld
root 72 (as shown in FIG. 10). Meanwhile, with the rotation provided by
the rotating plate 60, the deburring cutting tool 42 of the deburring
cutting tool apron 40 is able to debur an inner edge of the opening of
the metal pipe 70. Furthermore, with the rotation provided by the
rotating plate 60, the weld root reshaping tool 51 of the weld root
reshaping apron 50 is able to reshape the weld root 72 of the metal pipe
70.

[0030] Therefore, the pipe chamfering device of the present invention can
perform the chamfering process to form the bevel 71, the deburring
process and the reshaping process for the weld root 72 for the pipe
opening of the metal pipe 70. The rear end of the axial rod 23 of the
sliding member 20 is biased by the two springs 13A, 13B in the secured
member 10, such that the edge of the roller 24 presses tightly against
the inner wall of the opening of the metal pipe 70 and moves along the
inner wall of the opening of the metal pipe 70 with the rotation provided
by the rotating plate 60. Therefore, even if the opening of the metal
pipe 70 is not circular in shape, the thickness of the weld root 72
obtained be the chamfer process is still even.

[0031] Although the present invention has been explained in relation to
its preferred embodiment, it is to be understood that many other possible
modifications and variations can be made without departing from the
spirit and scope of the invention as hereinafter claimed.