JP3342284B2 - Circumferential beveling machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a peripheral groove processing apparatus for a tubular member such as a boiler tube which is applied to a boiler tube replacement welding work of a boiler.

[0002]

2. Description of the Related Art For example, in a thermal power plant, a number of long parallel boiler tubes are vertically installed. It is necessary to carry out the construction, which requires enormous costs and a considerable construction period, during which the boiler has to be closed. This is because the repair work by the partial replacement of the boiler pipe has not been conventionally performed because the means for economically replacing the boiler pipe has not been developed. By the way, a portable beveling machine is used for edge beveling of a general pipe body, and an air-driven beveling machine is employed as this kind of pipe beveling machine.

[0003]

However, in this type of conventionally known air-motor-driven portable pipe edge beveling machine, a mechanism for receiving a cutting reaction force is incorporated in a drive system. Since the outer diameter of the drive mechanism is large and high-pressure air is used for power, the control mechanism is also large. By the way, in the case of partial replacement of boiler pipes, the space between adjacent pipes is very small, such as about 50 mm. Cannot be hired. In addition, since the boiler tubes are arranged in a wall shape over a length of several tens of meters in the vertical direction, they can be installed and operated in a narrow work space at a high place,
If it is not small and lightweight, it cannot be used for on-site construction at high places.

The present invention has been proposed in view of such circumstances, and has a small size, light weight, and portability, and is easy, safe, and economical to handle a tubular member in a high place and in a narrow space. It is an object to provide a peripheral groove processing device.

[0005]

SUMMARY OF THE INVENTION In order to achieve such an object, a circumferential groove processing apparatus according to the present invention is a circumferential groove processing apparatus for processing a circumferential groove on a pipe end of a pipe,
The circumferential beveling device has a lower component and an upper component, and the lower component is supported by the mounting base for mounting the lower component on an outer peripheral surface of the pipe from a pipe end, and supported by the mounting base. A vice for fastening the mounting base of the lower component on an outer peripheral surface near the pipe end of the pipe, and the mounting base of the lower component is tightened on the outer peripheral surface of the pipe by the vice. A guide tube projecting from the mounting base of the lower component so as to protrude in the same direction as the direction in which the pipe end of the pipe is opened in parallel with the pipe when the upper component is provided. A copying cylinder which is movable in the pipe axis direction relative to the guide cylinder of the lower component and is rotatably fitted around the pipe axis; A tapered hole having an axis parallel to the copying cylinder and having the axis aligned with the pipe when the copying cylinder is fitted to the guide cylinder, and expanding inside the pipe toward the inside of the pipe. Is formed and circumferentially
Equally spaced along a radial plane passing through the centerline
Tool driving that has a large-diameter portion formed with a plurality of axial slits that are cut and opened toward the edge and that supports a groove for beveling at a portion near the large-diameter portion. An inner chuck that supports the shaft so as to be relatively rotatable, and a tapered body that is inserted into the center hole of the inner chuck and fitted to the tapered hole at the lower end thereof is protruded and is moved in the axial direction of the pipe. A clamping pin for expanding and contracting the outer diameter of the inner chuck; and a rear end of the machine frame of the upper component .
A vertical axis type motor for rotating the bite drive shaft via power transmission means built up on the upper surface and built into the machine frame;
A groove cutting process formed to be detachable from the mounting base.
And an engineered part .

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to the end processing of a boiler tube will be described with reference to the drawings. FIG. 1 is an overall vertical sectional view showing an assembled state, and FIG. 2 is a II-II of FIG. FIG. 3 is a two-sided view of FIG. 1 showing a mounting base portion, which is a part, and FIGS. 3A and 3B are front views thereof, respectively.
FIG. 4 is a side view, and FIG. 4 is a process diagram showing a procedure for partially cutting and removing the boiler tube of the apparatus of the present invention in FIG. 1 and a procedure for mounting the apparatus of the present invention.
FIG. 4C is a side view showing the mounting procedure of each component of the apparatus of the present invention in FIG. 4C, and FIG. 6 shows the expansion and contraction action of the inner chuck and the tightening pin in the feed reaction force receiving mechanism of FIG. FIG. 3B is a longitudinal sectional view and a bottom view showing the inner chuck in a reduced diameter state and an expanded diameter state, respectively.

For convenience of explanation, prior to describing the structure and operation of the device of the present invention in each of the above drawings, the device of the present invention will be described for each major component in order to facilitate understanding of the overall image of the device of the present invention. Outline the action.

[0008] First, the structure of the present invention device shown in FIG. 1, as shown in FIG. 3, half above the top component C _U forming the lower half portion, respectively, from each other independent two components of the lower component C _L It holds. Here, when each component is analyzed for each mechanism, first, the upper component _CU includes the drive mechanism 101, the feed mechanism 102, the cutting mechanism 104, and the feed reaction force receiving mechanism 10.
The lower component C _L
Comprises a mounting base 103. Next, as to which part of the boiler tube the two components are to be attached to, as shown in FIG. 4A, the damaged portion of the boiler tube is cut off at the upper and lower ends as a removal tube 44, and as shown in FIG. This device is attached to the part removed as shown in (B), as shown in FIG. That is, first, as shown in FIG.
After the mounting hole of the mounting base 103, which is the lower component, is inserted into the target pipe, the mounting base 103 is fitted to the target pipe lower part 46 by rotating the knob 35. Next, as shown in FIG. 3B, the upper component is positioned on the lower component, and the copying tube 24 is inserted into the guide tube 37 of the lower component as shown by the arrow.
At this time, after positioning the reaction force receiving mechanism 105 of the upper component so as to be on the center line of the target pipe lower part 46, as shown in FIGS. It is inserted into the lower part 46 of the pipe.

[0009] Here, the above mounting work is slightly expanded.
5A and FIG. 5B, the diameter of the protruding portion is within the inner diameter of the boiler tube 43 in consideration of the mountability of the rotating shaft support shaft in order to minimize the size of the removal tube 44. Thus, the restriction on the size of the removed portion due to the device size in the pipe axis direction is relaxed. Further, other protruding portions such as the motor 17 are arranged outside the processing portion to provide a mounting margin. These parts are mounted via the guide tube 37 of the mounting base 103 previously held. At that time, the cutting feed reaction force receiving mechanism 105 including the inner chuck 1 and the tightening pin 2 is simultaneously inserted into the lower part 46 of the target pipe as shown in FIG. The inserted cutting feed reaction force receiving mechanism 105 is inserted in the state shown in FIG.
The lower end of the center hole is machined with a tapered hole that expands downward, and the lower end of the clamping pin 2 is machined with a taper part that expands downward, and a large-diameter cylindrical taper portion at the lower end of the inner chuck 1. Is divided into four equal parts by a slit in the circumferential direction, inserted into the lower part 46 of the target pipe, and then the tightening pin 2 is tightened upward so that the tip end of the inner chuck 1 is directed outward in the radial direction by the taper effect of the tightening pin 2. By expanding the diameter of the target pipe, the pipe is fixed inside the target pipe lower part 46 with a pipe expanding force. this,
A plurality of radial and axial slits formed at equal intervals on the lower end of the inner chuck 1 are provided on the expanded portion to increase frictional resistance against an axial force. In this manner, the groove processing device 106 attached to the target pipe lower portion 46 is provided with a horizontal annular feed handle 1 fitted and protruded from the upper end of the inner chuck 1 as shown in FIG.
By manipulating 6, the single-edged cutting tool 3 and the flat cutting tool 4 can be rotated and moved via the feed mechanism 102 to machine the groove.

Next, the structure of the device of the present invention will be described in detail. First, as shown in FIGS. 1 and 2, the present invention is an apparatus for forming a groove on a pipe end face, using a small and high-torque vertical electric motor 17 as a power source, and driving the motor shaft by a motor shaft. The intermediate shaft bearing 21 has the drive gear 18 attached to the
The power is transmitted to the bite drive shaft 7 via an intermediate transmission portion including an intermediate transmission shaft 19 and an intermediate transmission gear 20 which are supported by the shaft. The tool drive shaft 7 is formed as a hollow shaft, and a pair of upper and lower bearings 10, an inner surface collar 8 and an outer surface collar 9 are arranged in the center hole thereof with the body of the inner chuck 1 as a base axis, and are made independent. The outer surface is configured to be independently rotatable by being separated and independent from the central case 14 by a pair of upper and lower bearings 11, and the single-edged bite 3 and / or the flat bite 4 attached to the lower part with the set screw 25 by the transmission power, and the inner chuck 1. It is processed by rotating around the axis of. In order to hold the driving mechanism 101 externally,
A central case 14, an upper case 22 integrated therewith, and a lower case 23 attached below the central case 14 are attached to the rotating system.

A feed mechanism 102 capable of moving up and down a drive unit including a rotating system by a screw mechanism is disposed above the central case 14 to feed during cutting. The feed mechanism unit 102
Partition the rotary system with the horizontal holding plate 12,
A mechanism for feeding by using a deformed vertical cylindrical feed screw 15 and a male screw provided on the outer periphery of the body of the inner chuck 1, and the feed screw is provided by sliding with the feed screw case 13 attached to the upper end of the central case 14. By turning the feed handle 16 attached to the device 15, the entire mechanism does not rotate but only moves up and down. Since this feed generates a reaction force at the time of beveling, the lower end of the inner chuck 1 and the clamping pin 2 inserted into the center hole thereof are fixed to and received on the inner surface of the pipe to be processed. As a mechanism for that,
The lower end of the center hole of the inner chuck 1 is tapered so as to expand downward, and is divided into the same number of fan-shaped cross sections by a plurality of equally spaced radial slits. The lower end of the inner chuck 1 is formed as a taper having the same gradient, and the lower end portion of the inner chuck 1 is expanded by tightening the tightening pin 2 with the tightening nut 6 via the holding bush 5 to be fixed to the inside of the target pipe with the expanding force. To receive the reaction force. Also, during groove processing,
The cutting reaction force generated at the time of rotary cutting is copied by a guide cylinder 37 which is set upright on a mounting base 103 previously attached to a lower part 46 of a processing target pipe in order to be supported by a copying cylinder 24 vertically provided on a drive mechanism 101. 24 can be attached.

As shown in FIG. 2, the mounting base 103 includes a pair of front and rear V-block fixed claws 26 and movable claws 2.
7 and a fixed front plate 32, a rear plate 33 with a feed screw, a side plate 39,
A pair of right and left slide rails 29 in the front-rear direction protrudingly provided on the inner surfaces of the left and right side plates of the long cubic box formed in the front-rear direction, the bottom plate 31 and the top plate 30; The movable claw 27 is tightened by a male screw of a drive shaft 34 via a knob 35 fixed thereto by a set screw 36, and the fixed claw 26 attached to the fixed front plate 32 is fixed to the processing target tubes 45 and 46, respectively. Let it.

Here, in the description of the above-mentioned embodiment, in order to supplement an insufficient point, it is slightly added as follows. (1) This apparatus rotates a cutting tool electrically, feeds the cutting tool manually, and processes the circumferential groove of the pipe. There are two types of cutting tools. A single-edged cutting tool processes a groove surface, and a flat cutting tool processes a mating surface. Both cutting tools are used at the same time, and each cutting tool is used alone.
Because this device is used in the field, there is a great advantage in a handy place, and the space that can be machined by mounting the device has a large restriction of about 50 mm in width, so it is difficult to automatically feed. Feeding is manual. However, in the field where there is no restriction due to space, the feed can be electrically driven. (2) The lower part of the feed screw 15 surrounded by the feed screw case 13 and the holding plate 12 causes the feed rotation to be performed on the main body of the apparatus in order to fix the apparatus of the present invention to one of the pipes to be processed and to function the present mechanism. I do not tell the face slip. (3) The feed reaction force acts in the direction of the rotation axis, and is received by the inner chuck 1 and the fastening pin 2. The cutting reaction force is
The tool acts as a rotational force from the processing point of the cutting tool to the processing pipe in the circumferential direction around the rotation axis to the entire apparatus. The cutting reaction force is applied to the fixed claw 26 and the movable claw 27 with respect to the pipe to be processed.
, The guide cylinder 37 of the mounting base 103 fixed in the rotation and the axial direction, and the scanning cylinder 2 attached to the drive mechanism 101.
With the insertion accuracy of 4, it is received as a fixing force to the pipe to be processed. (4) The inner chuck 1 and the tightening pin 2 have a main function of receiving a reaction force and setting a rotary shaft, and have a structure separated from a cutting tool drive shaft. (5) The fixed position of the inner chuck 1 is adjusted by fine adjustment of manual feeding. As described above, the main function of the inner chuck 1 is to receive the reaction force and center the rotation axis, and the weight support and the rotation support are the sub-functions. The weight of the main body of this device is
Since the prototype is 3.5 kg, if it is a simple substance, the strength is sufficient and horizontal processing is possible. (6) As shown in FIG. 2, the mounting base 103 connects a fixed claw fixed to the outer diameter of the pipe to be processed with a side plate and a moving claw arranged on one side from a feed screw and a pair of front and rear V blocks and the like. The guide cylinder is fixed to the pipe to be processed by a vice mechanism, and the axis from the preset outer diameter is determined. It is arranged so that the central axis of the copying cylinder 24 attached to the mechanism section 101 coincides. Thus, if the copying tube 24 is inserted into the guide tube 37, the machining axis can be set at any position of the boiler tube, and the axis can be copied with respect to the feed. (7) Since part of the boiler tube group is cut off at the time of periodic inspection of the thermal power plant, it is necessary to make the cut length as small as possible. In the following case, the space can be used as a set space, and therefore, according to the present invention, the size of the removed portion can be reduced.

In the above description, the case where a groove is formed at the upper end portion of the target pipe lower portion 46 in the vertical fixed pipe replacement repair method is described. Also in processing, the present apparatus can be mounted with both components turned upside down, and the present apparatus can be mounted in a horizontal posture, and bevel processing can be performed on both ends of the object pipes facing each other.

For example, upward cutting is performed in the following manner. That is, first, the lower component is fixed to the target pipe upper part 45, and then the feed reaction force receiving mechanism 105 is inserted into the target pipe upper part 45 while supporting the upper component by hand. insert. In this state, the tightening nut 6 is rotated to enlarge the inner chuck 1 and fix the inner chuck 1 in the upper portion 45 of the target pipe. This completes the arrangement of the apparatus at the machining position, and the cutting is performed by rotating the feed handle 16 to raise the single-edged cutting tool 3 and the plane cutting tool 4. According to such a means, it is possible to obtain a guide means and a connecting means for connecting both components by a copying tube which is small and light in weight, has a simple structure and is easy to handle in spite of a narrow work site.

[0016]

According to the apparatus of the present invention, a method for partially replacing and repairing a boiler tube has been established, and portability, mountability, and processing safety by a biaxial support method, which could not be realized by conventional means, have been improved. As a result, the dimensional restrictions can be largely eliminated.

In short, according to the circumferential groove processing apparatus of the present invention, a circumferential groove processing apparatus for processing a circumferential groove on a pipe end of a pipe, the circumferential groove processing apparatus having a lower component and an upper component. A mounting base for mounting the lower component on an outer peripheral surface from the pipe end of the pipe; and the lower component supported on the mounting base and mounted on an outer peripheral surface near the pipe end of the pipe. And a vise for fastening the mounting base portion, and when the mounting base portion of the lower component is fastened on the outer peripheral surface of the piping by the vice, a pipe end of the piping is parallel to the piping. A guide tube protruding from the mounting base of the lower component so as to project in the same direction as the opening direction; A copying cylinder which is movable in the pipe axis direction relative to the guide cylinder of the component and is rotatably fitted around the pipe axis; and a copying cylinder having an axis parallel to the copying cylinder. When fitted to the guide tube, a tapered hole is formed on the same axis as the pipe so as to expand toward the inside of the pipe inside the pipe and is equally spaced in the circumferential direction. Through the center line
Cut along the radial plane and open towards the edge
A large diameter portion having a plurality of axial slits formed therein, and a bar for supporting a beveling bit at a portion near the large diameter portion.
An inner chuck that rotatably supports the light source drive shaft, and a tapered body that is inserted into the center hole of the inner chuck and that fits into the tapered hole at the lower end thereof and is protruded so as to be moved in the axial direction of the pipe. And a vertical pin for rotating the bite drive shaft via a power transmission means built up into the machine frame of the upper component , which is provided on a top surface of a rear end portion of the machine frame of the upper component.
A shaft type motor is provided so that it can be inserted into and removed from the mounting base.
Since it has a formed bevel cutting part , it is small, lightweight and portable, and it is easy to handle tubular members in high places and narrow spaces, and it is safe and economical circumferential beveling The present invention is of great industrial benefit because of obtaining the device.

[Brief description of the drawings]

FIG. 1 is an overall vertical sectional view showing an assembled state in one embodiment in which the present invention is applied to a pipe end processing of a boiler pipe.

FIG. 2 is a horizontal sectional view taken along an arrow showing a copying mechanism holding portion which is a II-II portion in FIG.

FIG. 3 is a two-sided view of FIG. 1, and FIGS. 3A and 3B are a front view and a side view, respectively.

4 is a process chart showing a procedure for partially cutting and removing a boiler tube of the apparatus of the present invention in FIG. 1 and a procedure for mounting the apparatus of the present invention.

FIG. 5 is a side view as viewed from the direction of the arrows VV, showing a procedure for mounting each component of the device of the present invention in FIG. 4 (C).

FIGS. 6A and 6B show the expansion and contraction of the inner chuck and the tightening pin in the cross-sectional view of the feed reaction force receiving mechanism of FIG. 1; FIGS. It is a longitudinal section showing a state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner chuck 2 Tightening pin 3 Single-edged bite 4 Flat bite 5 Pressing bush 6 Tightening nut 7 Bite drive shaft 8 Inner collar 9 Outer collar 10, 11 Bearing 12 Holding plate 13 Feed screw case 14 Central case 15 Feed screw 16 Feed handle 17 Motor Reference Signs List 18 Motor drive gear 19 Intermediate transmission shaft 20 Intermediate transmission gear 21 Intermediate shaft bearing 22 Upper case 23 Lower case 24 Copying cylinder 25 Byte set screw 26 Fixing claw 27 Movable claw 28 Shaft end support member 29 Slide rail 30 Top plate 31 Bottom plate 32 Fixation Front plate 33 Rear plate with feed screw 34 Vice drive shaft 35 Knob 36 Set screw 37 Guide cylinder 38 Washer 39, 40 Side plate 41 Slit 42 Cover mounting screw 43 Boiler tube 44 Removal tube 45 Upper target tube 46 Lower target tube 101 Drive mechanism 10 Feed mechanism 103 mount portion 104 Cutting mechanism 105 sends the reaction force receiving mechanism portion 106 beveling device

──────────────────────────────────────────────────続 き Continued on the front page (72) Kazuhiko Kamo 2-1-1, Shinhama, Arai-machi, Takasago City, Hyogo Prefecture Inside the Takasago Research Laboratory, Mitsubishi Heavy Industries, Ltd. 1-1 1-1 Mitsubishi Heavy Industries, Ltd.Kobe Shipyard (72) Inventor Hisamitsu Uchiya 1-1-1, Wadasaki-cho, Hyogo-ku, Kobe-shi, Hyogo Prefecture Mitsubishi Heavy Industries, Ltd.Kobe Shipyard (72) Inventor Ono Jun 1-1, Wadazaki-cho, Hyogo-ku, Kobe-shi, Hyogo Prefecture Inside Kobe Shipyard, Mitsubishi Heavy Industries, Ltd. (56) References JP-A-63-260714 (JP, A) JP-A-60-157116 (JP, U) ) Japanese Utility Model 1-84913 (JP, U) Japanese Utility Model 3-22844 (JP, U) Japanese Utility Model 56-1332044 (JP, U) Japanese Utility Model Utility Model 55-26672 (JP, U) (58) Field (Int. Cl. ⁷ , DB name) B23B 5/16 B23C 3/12

Claims (1)

(57) [Claims] 1. A circumferential beveling device for processing a circumferential bevel on a pipe end of a pipe, the circumferential beveling device having a lower component and an upper component, wherein the lower component connects the lower component. A mounting portion for mounting on the outer peripheral surface from the pipe end of the pipe, and fastening the mounting base portion of the lower component to an outer peripheral surface supported by the mounting portion and near the pipe end of the pipe. When the mounting base of the lower component is fastened on the outer peripheral surface of the pipe by the vise, the vise projects in the same direction as the direction in which the pipe end of the pipe opens in parallel with the pipe. A guide tube protruding from the mounting base of the lower component, and the upper component is connected to the guide tube of the lower component. A copying tube that is relatively movable in the pipe axis direction and is rotatably fitted around the pipe axis, and has an axis parallel to the copying pipe, and the copying pipe fits into the guide pipe. A tapered hole which is placed on the same axis as the pipe and expands toward the inside of the pipe inside the pipe is formed and formed at equal intervals in the circumferential direction.
Cut along the radial plane passing through the centerline to the edge
A large-diameter portion formed with a plurality of axial slits that are open toward the outside, and a groove for beveling at a portion near the large-diameter portion.
An inner chuck that supports the cutting tool drive shaft that supports the inner chuck so as to be relatively rotatable, and a tapered body that is inserted through the center hole of the inner chuck and that fits into the tapered hole at the lower end thereof protrudes and moves in the axial direction of the pipe. By rotating the tool drive shaft through a tightening pin that expands and contracts the outer diameter of the inner chuck and a power transmission unit that is erected on the upper surface of the rear end of the machine frame of the upper component and built in the machine frame.
A vertical shaft type motor for rotating is fitted to the mounting base.
And a groove cutting portion formed so as to be detachable .