JPH07256501A - Apparatus for working end face of pipe - Google Patents

Abstract

PURPOSE:To provide an apparatus for working an end face of a pipe, capable of facing easily accurately the face even if it is worked in the outdoor field work with the unskilled in the art. CONSTITUTION:A hemispheric concave surface 3 is provided on one side of a support drum 2 fixed to the inner wall surface of a pipe 1 and a hemispheric convex surface 13 of a spherical surface support stand 12 with a shaft is provided to be inscribed in the hemispheric concave surface 3. Also, a hollow shaft body 26 slid only axially by the operation of a handle 17b is mounted to a hollow shaft body 14 of the spherical surface support stand 12 with the shaft and a guide plate 36 having a rotary housing 32 and cutting edge 38 is supported rotatably on the outer peripheral part of the hollow shaft body 26. In addition, a mechanism is provided which has cam 47 engaged with a gear 44 to rotate a transmission shaft 42 and screw rod 41 in the operation of an operation lever 46 and shift radially the cutting edge 38.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe end face processing device which is attached to an end portion of a pipe to be cut and cuts the end face of the pipe.

[0002]

2. Description of the Related Art In piping work for transportation pipelines, manufacturing work of industrial equipments and structures, etc., it is necessary to cut the end faces of the pipes when welding the necessary joints of the pipes. As such a pipe end face cutting apparatus, an indoor-installed dedicated machine or boring machine has been conventionally known.

However, such an indoor-installed processing apparatus is suitable for cutting the end surface of the pipe in a plane orthogonal to the axis, but it is complicated in the case of processing the end surface with an angle. However, there is a problem in that it is difficult to carry out centering work using a jig, and it is difficult to process unless a skilled person is used, and the apparatus becomes expensive. In addition, such an indoor installation type processing device is suitable for processing pipes of a fixed size,
It is not suitable for the case where the fusing end face is machined after fusing the pipe as needed during on-site construction.

Therefore, conventionally, in such an outdoor construction site, it is the actual situation that the end face processing is performed by using a grinder.

[0005]

However, the processing method using the grinder as described above has problems that the processing is complicated and time-consuming, and that accurate processing is difficult. If such an accurate processing is not performed, a welding defect will occur when the end faces of the pipe are welded.

The present invention has been made in view of the above problems, and provides a pipe end surface processing apparatus capable of performing surface processing easily and accurately even by an unskilled person even at an outdoor construction site. The purpose is to provide.

[0007]

In order to achieve the above-mentioned object, a pipe end surface processing apparatus according to the present invention is a pipe end surface processing apparatus which is attached to an end portion of a pipe and cuts the end surface of the pipe. A supporting drum having a fixing mechanism for fixing the processing device to the inner wall surface of the pipe, and having a concave hemispherical surface in the center, (b) a convex hemisphere inscribed in the concave hemispherical surface of the supporting drum Has a face,
A support base whose tilt angle is adjustable with respect to the support drum, and (c) a cutting blade which is slidably and swivelably supported on this support base and which cuts the end face of the pipe at its tip end. It is characterized by including the cutting blade holder.

It is preferable that the tilt angle of the support table with respect to the support drum is adjusted in a state where the spherical centers of the concave hemispherical surface and the convex hemispherical surface are aligned with each other.

It is preferable that the fixing mechanism includes a plurality of expansion segments inscribed on the inner wall surface of the pipe, and a wedge for moving each expansion segment in the radial direction of the pipe by the operation of a cylinder.

The support base has a first hollow shaft body projecting in a direction opposite to the convex hemispherical surface, and the cutting blade holder is slidable and swivelable with respect to the first hollow shaft body. It is good to support it.

The cutting blade holder is provided with a second hollow shaft body slidable only in the axial direction of the first hollow shaft body, and the second hollow shaft body.
It is preferable to provide a revolving body capable of revolving around the hollow shaft body, and to attach the cutting blade to an outer peripheral portion of the revolving body.

The second hollow shaft body is preferably slidably operated with respect to the first hollow shaft body by a handle.

It is preferable that the revolving unit be revolved through a gear by the rotation of a motor fixed to the second hollow shaft.

It is preferable that the cutting blade is moved in the radial direction of the revolving unit by a pitch feed mechanism.
Here, the pitch feed mechanism includes a nut integrally attached to a tool rest that supports the cutting blade, a screw rod screwed to the nut, a transmission shaft that transmits rotation to the screw rod, and the transmission shaft. A gear attached to the end of the gear, a cam that engages with the gear to rotate the gear by a predetermined angle, and an operating lever that rotates the cam between an engaging position and a non-engaging position with the gear. Can be provided.

[0015]

In the present invention, the support drum is fixed and held on the inner wall surface of the pipe by the fixing mechanism in a state where the support drum is inserted inside the pipe, and in this state, the cutting blade holder slides on the support base. It is moved and swung to cut the end face of the pipe. Further, when cutting the end surface of the pipe to an arbitrary inclination, the same processing as described above is performed after adjusting the inclination angle of the support base with respect to the support drum.

Here, assuming that the fixing mechanism is provided with a plurality of expansion segments inscribed on the inner wall surface of the pipe and a wedge for moving each expansion segment in the radial direction of the pipe by the operation of the cylinder, 1 By operating the individual cylinders, the support drum can be easily and reliably fixed to and held on the inner wall surface of the pipe.

Further, the support base has a first hollow shaft body projecting in a direction opposite to the convex hemispherical surface.
The second hollow shaft body is provided slidably only in the axial direction with respect to the hollow shaft body, and a swivel body that can swivel around the second hollow shaft body is provided. When the cutting blade is attached to and the second hollow shaft body is configured to be slidably operated with respect to the first hollow shaft body by the handle, the cutting blade can be easily slid in the axial direction by the handle operation. Is possible.

Further, the cutting blade is moved in the radial direction of the revolving structure by a pitch feed mechanism. In this case,
As a pitch feed mechanism, a nut that is integrally attached to the tool post that supports the cutting blade, a screw rod that is screwed to this nut, a transmission shaft that transmits rotation to this screw rod, and an end portion of this transmission shaft. A gear that is engaged with the gear, a cam that engages with the gear to rotate the gear by a predetermined angle, and an operating lever that rotates the cam between an engagement position and a non-engagement position with the gear. When adopted, the pitch of the cutting blade can be easily fed in the radial direction of the pipe simply by operating the operation lever, and the surface of the end face of the pipe can be easily and accurately machined by a simple mechanism.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A concrete embodiment of the pipe end surface processing apparatus according to the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of a pipe end surface processing apparatus according to an embodiment of the present invention, and FIG. 2 is a view taken along the line AA of FIG. In the pipe end face processing apparatus of this embodiment, the pipe 1 is processed from the end portion of the pipe 1 which is a workpiece.
A cylindrical support drum 2 inserted therein is provided. The support drum 2 has a concave hemispherical surface 3 whose central portion opens outward, and a cylindrical body 4 is integrally formed on the back surface side of the concave hemispherical surface 3 and an end portion of the cylindrical body 4 is formed. The support plate 5 is provided in the shape.

A pressure plate 6 is provided on the back side of the support drum 2 so as to face the support plate 5. A plurality of (six in this example) wedges 7 are attached to the peripheral portion of the pressure plate 6, and an expansion segment 8 inscribed in the inner wall of the pipe 1 is provided so as to be in sliding contact with the outer peripheral surface of each wedge 7. There is. A hydraulic cylinder 9 is attached to the center of the pressure plate 6, and a tip of a rod 11 attached to a piston 10 of the hydraulic cylinder 9 is fixed to the support plate 5 of the support drum 2. Thus, when the hydraulic cylinder 9 is operated with the support drum 2 inserted inside the pipe 1, each wedge 7 slides in the axial direction along the outer peripheral surface of the support drum 2 and the sloped surface of the expansion segment 8 is expanded. By pushing and expanding, the support drum 2 is fixed and held on the inner wall surface of the pipe 1 with the center of the inner diameter of the pipe 1 and the spherical center of the concave hemispherical surface 3 of the support drum 2 aligned.

The support drum 2 has a shaft-supported spherical support base 1
2 are supported. The shaft-equipped spherical surface support 12 has a convex hemispherical surface 13 inscribed in the concave hemispherical surface 3 of the support drum 2 and a hollow shaft body 14 projecting in the opposite direction to the convex hemispherical surface 13. ing. In addition, this hollow shaft body 14
A rod (nut) 15 is provided so as to pass through the axial center of the rod 15, a proximal end portion of a threaded rod 16 having a small diameter is screwed to the tip end side of the rod 15, and a handle is attached to the proximal end side of the rod 15. A hollow threaded rod 17 with a fitting is fitted. In addition, rod 1
5 can be rotated by inserting a tool from a tool hole 17a drilled in the proximal end side of the hollow screw rod 17 with a handle, whereby the rod 15 can be tightened or loosened with respect to the screw rod 16. Has been done.

The tip of the screw rod 16 is fixed to the convex hemispherical surface 13, and the tip of the fixing portion is concave hemispherical surface 3.
It penetrates through the hole 18 formed in the concave hemispherical surface 3 and is projected to the rear surface side of the concave hemispherical surface 3, and is fixed to the concave hemispherical surface 3 by a washer 19 and a nut 20. Further, between the flange 21 provided on the peripheral edge of the convex hemispherical surface 13 and the side surface of the support drum 2 facing the flange 21, two ring-shaped bodies 22 and 23 each having a slope are inserted. And the two ring-shaped bodies 2 with the rod 15 loosened
By rotating 2 and 23 by an appropriate angle, the threaded rod 16 can freely move in the hole 18 and the mounting angle of the convex hemispherical surface 13 to the concave hemispherical surface 3 can be adjusted.
Then, the shaft-equipped spherical support 12 is fixed to the support drum 2 with bolts 24 at an arbitrary rotation angle position of the convex hemisphere 13. In this way, when adjusting the mounting angle of the convex hemispherical surface 13, the spherical center of the support drum 2 and the shaft-equipped spherical surface support 12 is always kept at a constant position. Here, by grading the ring-shaped bodies 22 and 23, it is possible to easily adjust the inclination angle of the spherical support 12 with a shaft while observing the graduation. The reference numeral 25 in the figure denotes a rib for reinforcing the screw rod 16.

The hollow threaded rod 17 with a handle is screwed into the end of the hollow shaft 14 and is connected to the large-diameter hollow shaft 26 at the base end side through a sleeve (not shown). The hollow shaft body 26 is configured to be slidable only in the axial direction with respect to the hollow shaft body 14 by using a key 27 fixedly implanted on the outer peripheral surface of the inner hollow shaft body 14 as a rotation stopper.
Further, the hollow threaded rod 17 with a handle can slide only in the rotational direction. Therefore, when the handle 17b of the hollow threaded rod 17 with a handle is turned, the hollow shaft 26 is axially moved back and forth with respect to the spherical support 12.

The fixed support plate 2 is attached to the end of the hollow shaft 26.
8 is bolted. A rotary housing 32 is supported on the outer peripheral portion of the hollow shaft body 26 via a bearing 31 fixed by a sleeve 29 and a nut 30. An internal gear 33 is fixed to the side surface of the rotary housing 32. This internal gear 33
Engages with a pinion 35 rotated by a motor 34 supported by a fixed support plate 28. Therefore, the motor 34
When is rotated, the rotation is transmitted to the internal gear 33 through the pinion 35, whereby the rotary housing 32 rotates around the hollow shaft body 26.

A guide plate 36 is fixed to the outer peripheral portion of the rotary housing 32 by bolts. A tool rest 37 is attached to the inner surface on the tip side of the guide plate 36 so as to be slidable with respect to the guide plate 36.
8 is attached. A nut 39 is fixed to the tool rest 37, and a bevel gear 40 is attached to the tip of the nut 39.
A threaded rod 41 having a screw is screwed. Further, a transmission shaft 42 is arranged so as to be orthogonal to the screw rod 41, a bevel gear 43 that meshes with the bevel gear 40 of the screw rod 41 is provided at one end of the transmission shaft 42, and a gear is provided at the other end. 44
Is provided. Incidentally, reference numeral 45 in the figure denotes a bearing that supports the screw rod 41 and the transmission shaft 42.

The fixed support plate 28 is also provided with a cam shaft 48 which is rotated by the operation of the operation lever 46 and has a cam 47 attached to the tip thereof. Cam 47
Acts on the gear 44 of the transmission shaft 42 when the operating lever 46 is operated to rotate the gear 44 by a predetermined angle.

Next, the feeding operation of the cutting blade 38 by the engagement between the cam 47 and the gear 44 will be described with reference to FIGS.

When the operating lever 46 is at the position B in FIG. 3, the cam 47 is not engaged with the gear 44 and the transmission shaft 42 is not rotated. Therefore, in this state, when the motor 34 is rotated, the cutting blade 38 performs only the turning operation via the guide plate 36, and does not perform the feeding operation in the arrow D direction (see FIG. 1).

In order to cause the cutting blade 38 to perform the feeding operation,
When the operating lever 46 is rotated to the position C in FIG. 3, the cam shaft 48 is rotated to rotate the cam 47 to a position where the cam 47 engages with the gear 44. Therefore, when the gear 44 is rotated integrally with the guide plate 36 by the rotation of the motor 34, when the gear 44 passes through the position of the cam 47, as shown in FIGS. It engages with the cam 47 and is rotated by a predetermined angle. And in this way the gear 4
When 4 is rotated, the transmission shaft 42 is rotated by a predetermined angle, the rotation is transmitted to the screw rod 41 via the bevel gears 43, 40, and the cutting is performed via the nut 39 screwed to the screw rod 41. The blade 38 is fed by a predetermined pitch in the direction of arrow D. Here, since the operation lever 46, the cam 47, and the like are provided in two sets, one set for each rotation angle of 180 °, the above-described feeding operation of the cutting blade 38 at the predetermined pitch is performed by the rotation housing 32, in other words, in other words. This is performed every time the cutting blade 38 rotates by 180 °, and the end surface of the pipe 1 is cut from the outer peripheral surface to the inner peripheral surface (or the inner peripheral surface to the outer peripheral surface). When the feeding operation of the cutting blade 38 is stopped, the operation lever 46 may be returned to the original position (position B).

In order to cut the end surface of the pipe 1 using the pipe end surface processing apparatus of this embodiment, first, the hydraulic cylinder 9 is operated with the support drum 2 inserted inside the pipe 1 to operate the support drum. 2 is fixed and held on the inner wall surface of the pipe 1, and the motor 34 is rotated in this state to rotate the cutting blade 38. Then, the handle 17b of the hollow threaded rod 17 with a handle is rotated to move the hollow shaft 26 in the axial direction with respect to the spherical support 12, and the operation lever 46 is rotated to move the cutting blade 38 in the radial direction. The end face is processed by moving it by a predetermined pitch. In this case, depending on the shape of the cutting blade 38, the cutting can be performed only by moving the handle 17b in the axial direction.

When cutting the end surface of the pipe 1 to an arbitrary inclination, the tool is inserted from the tool hole 17a and the rod 1
With the bolt 5 loosened, the bolt 24 is loosened to rotate the two ring-shaped members 22 and 23 by an appropriate angle, and the rod 15 is moved at a predetermined position.
And tighten the bolt 24. Then, the mounting angle of the shaft-equipped spherical surface support 12 is adjusted with the spherical center kept at a constant position with respect to the support drum 2.

In this embodiment, two sets of the operation lever 46, the cam 47 and the cam shaft 48 are described, but it is also possible to provide only one set. When only one set of the operation levers 46 and the like is provided in this manner, the cutting blade 38 is fed by a predetermined pitch each time the cutting blade 38 turns 360 °.

In this embodiment, the supporting drum 2 is fixed and held on the inner wall surface of the pipe 1 by using the combination of the wedge 7 and the expansion segment 8. The hydraulic cylinder may be fixed and held.

[0035]

As described above, according to the present invention, since the supporting base is supported by the supporting drum by the two hemispherical surfaces having the concavo-convex shape which are in contact with each other,
After mounting the processing device on the pipe to be processed, the inclination angle of the support can be easily adjusted. Therefore, even at an outdoor construction site, even an unskilled person can easily and accurately process the end surface of the pipe into an arbitrary inclined surface.

[Brief description of drawings]

FIG. 1 is a sectional view of a pipe end surface processing device according to an embodiment of the present invention.

FIG. 2 is a view on arrow AA of FIG.

FIG. 3 is an explanatory view of a cutting blade feeding operation in the present embodiment.

FIG. 4 is an explanatory view of a cutting blade feeding operation in the present embodiment.

[Explanation of symbols]

 1 Pipe 2 Support Drum 3 Concave Hemisphere 6 Pressure Plate 7 Wedge 8 Expansion Segment 9 Hydraulic Cylinder 12 Spherical Support with Shaft (Support) 13 Convex Hemisphere 14 Hollow Shaft (First Hollow Shaft) 15 Rod 16 screw rod 17 hollow screw rod with handle 17b handle 22, 23 ring-shaped body 26 hollow shaft body (second hollow shaft body) 28 fixed support plate 32 rotary housing 33 internal gear 34 motor 35 pinion 36 guide plate 37 tool post 38 Cutting Blade 39 Nuts 40, 43 Bevel Gear 41 Screw Rod 42 Transmission Shaft 44 Gear 46 Operation Lever 47 Cam

Claims (9)

[Claims] 1. A pipe end face processing device which is attached to an end part of a pipe and cuts the end face of the pipe, wherein (a) a peripheral part has a fixing mechanism for fixing the processing device to an inner wall surface of the pipe, and a center part thereof. A supporting drum having a concave hemispherical surface at its portion, and (b) a supporting drum having a convex hemispherical surface inscribed in the concave hemispherical surface of the supporting drum, the tilting angle of which is adjustable with respect to the supporting drum Table and (c) a pipe end surface processing device, which is slidably and swivelably supported by the support table, and is provided with a cutting blade holder having a cutting blade for cutting an end surface of the pipe at a tip portion thereof. . 2. The pipe end surface processing according to claim 1, wherein the inclination angle of the support base with respect to the support drum is adjusted with the spherical centers of the concave hemispherical surface and the convex hemispherical surface aligned. apparatus. 3. The fixing mechanism comprises a plurality of expansion segments inscribed on the inner wall surface of the pipe, and a wedge for moving each expansion segment in the radial direction of the pipe by the operation of a cylinder. Alternatively, the pipe end face processing device according to item 2. 4. The support base has a first hollow shaft body projecting in a direction opposite to the convex hemispherical surface, and the cutting blade holder is slidable with respect to the first hollow shaft body. The pipe end surface processing device according to any one of claims 1 to 3, which is rotatably supported. 5. The cutting blade holder is provided with a second hollow shaft body which is slidable only in the axial direction of the first hollow shaft body, and a swivel capable of swiveling around the second hollow shaft body. The pipe end surface processing device according to claim 4, further comprising a body, and the cutting blade is attached to an outer peripheral portion of the revolving structure. 6. The pipe end surface processing apparatus according to claim 5, wherein the second hollow shaft body is slidably operated with respect to the first hollow shaft body by a handle. 7. The pipe end surface processing device according to claim 5, wherein the revolving unit is revolved through a gear by the rotation of a motor fixed to the second hollow shaft. 8. The pipe end surface processing apparatus according to claim 5, wherein the cutting blade is moved in a radial direction of the revolving structure by a pitch feed mechanism. 9. The pitch feed mechanism includes a nut integrally attached to a tool rest that supports the cutting blade, a screw rod screwed to the nut, a transmission shaft that transmits rotation to the screw rod, A gear attached to the end of the transmission shaft,
9. A cam according to claim 8, further comprising a cam that engages with the gear to rotate the gear by a predetermined angle, and an operation lever that rotates the cam between an engagement position and a non-engagement position with the gear. The pipe end face processing device described.