JP3027698B2 - Pipe end grinding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe end grinding apparatus for grinding a pipe end of a main body of, for example, a reactor of a chemical plant at an installation site, and more particularly to improvement of grinding accuracy and shortening of operation time.

[0002]

2. Description of the Related Art For example, boilers, reactors and various pipes are used in chemical plants and the like, and if they are operated for a long time, it is necessary to disassemble and repair the entire apparatus. When disassembling and repairing boilers, reactors, and various piping, etc., the surface of the flat seat of the flange joint connecting the components formed of large-diameter pipes, such as boilers and reactors, also takes a long time. The surface of the flat seat is ground at the site to improve the airtightness because it has become rough due to operation.

As a portable pipe end grinding apparatus for grinding the surface of a flat seat of a flange joint attached to an ordinary pipe end on site, for example, as shown in a side view of FIG. A pipe fixing device 3 having a plurality of holding parts 2 which are attached to the lower end of the non-rotating shaft 1 and which expand and contract in the radial direction of the non-rotating shaft 1 by a feed screw or hydraulic pressure, and which are rotatably mounted on the non-rotating shaft 1 and are internally Rotating body 4 having gear group and clutch mechanism
And a radial automatic feed shaft 6 connected to the feed screw 5 and a gear in the rotating body 4 and rotating the feed screw 5 during automatic operation, and an upper and lower feed screw 7 connected to a gear in the rotating body 4 to rotate the rotating body 4. An apparatus having a tool rest 8 movable in a radial direction and a vertical direction is used.

When the end face of the pipe 10 is ground using this pipe end grinding apparatus, first, the holding section 2 of the pipe fixing apparatus 3 is inserted into the pipe 10 in a retracted state, and then each holding section is grounded. 2 is extended and the tip is pressed against the inner surface of the pipe 10 to fix the pipe end grinding device to the end of the pipe 10. Next, the tool post 8 is manually moved in the radial direction and the vertical direction, and the grinding tool 9 attached to the tool post 8 is aligned with the end face of the pipe 10. Thereafter, a driving device, for example, an air-drill unit connected to the driving shaft 11 of the rotating body 4 is driven to rotate the rotating body 4. The tool rest 8 is rotated along the end of the pipe 10 by the rotation of the rotating body 4, and the tool 9 is automatically fed in synchronization with the rotation of the rotating body 4 to feed the tool rest 8 at a predetermined pitch in the radial direction. Is used to grind the end surface of the pipe 10. Thus, the end surface of the tube 10 is ground at a constant grinding speed, and the end surface of the tube 10 is smoothed.

[0005]

The above tube end grinding apparatus is provided with a pipe fixing device 3 when there is a space inside the pipe 10 to be machined.
Can securely fix the pipe end grinding device to the pipe 10, for example, as shown in FIG. 5, a large-diameter tubular main body 21 and a main body 2.
1 and a large number of reaction tubes 22 made of steel tubes having a small diameter. As in the heat exchange reactor 23 for supplying and absorbing the reaction heat with the pressurized water W to generate and recover steam S,
Main body 21 in which a large number of reaction tubes 22 are housed inside the tube ends
Could not be fixed by inserting the pipe fixing device 3 inside the pipe, and the pipe end grinding device could not be used.

For this reason, when grinding the flat seat surface of the flange joint attached to the end of the main body 21 of the heat exchange type reactor 23 in which a large number of reaction tubes 22 are housed inside the tube end, cutting and cutting are required. Finishing must be done manually,
The processing operation was not easy, and the processing operation required a lot of time.

SUMMARY OF THE INVENTION The present invention has been made in order to solve such disadvantages, and it is an object of the present invention to quickly and accurately grind a flat seat surface of a flange joint attached to a tube in which a reaction tube or the like is arranged to an end. It is an object of the present invention to obtain a pipe end grinding device capable of performing the above-mentioned.

[0008]

A pipe end grinding apparatus according to the present invention comprises a pipe fixing device for fixing a non-rotating shaft to a pipe to be cut, and a pipe fixing apparatus which approaches a pipe end of the pipe to be cut and forms a non-rotating shaft. rotatably mounted, possess a rotating body, and radial attached to the rotating body rotating body and freely tool rest moves in the vertical direction, and a driving device for rotating the rotating body having a gear train therein, large Caliber
Of a small diameter steel pipe housed in a tubular body
Of the flange joint at the end of the body with a number of pipes
In the pipe end grinding device for cutting , the above pipe fixing device has a fixed flange mounted on a non-rotating shaft, a permanent magnet built-in and a magnetic force on / off switching mechanism, and a lower surface of the fixed flange.
Attached and housed in a large diameter tubular body
And a plurality of magnetic attraction means for attracting and fixing to an end of the pipe .

[0009]

According to the present invention, when grinding the flat seating surface of a flange joint attached to a pipe in which a reaction tube made of a steel pipe having a small diameter is disposed at the end, the pipe is provided at a lower portion of a pipe end grinding device. The magnetic adsorption means of the tube fixing device is installed on a reaction tube or the like in a state where the magnetic attraction is turned off,
After positioning the pipe end grinding device with respect to the flat seat of the flange joint, the suction force by the magnetic force of the magnetic attraction means is turned on to magnetically attract the reaction tube or the like and fix the tube end grinding device to the pipe to be processed. . In this state, the flat seat surface of the flange joint is ground, and when the grinding is completed, the suction force by the magnetic force of the magnetic attraction means is turned off and the flange joint is removed from the pipe end grinding device.

[0010]

FIG. 1 is a side view showing an embodiment of the present invention. As shown in the figure, the pipe fixing device 13 of the pipe end grinding device
A large-diameter fixed flange 14 attached to the lower end of the non-rotating shaft 1 and a plurality of, for example, three or four fixed flanges attached to the lower end of the fixed flange 14 as shown in the bottom view of FIG.
And magnetic attraction means 15. Magnetic attraction means 15
Has a built-in permanent magnet similar to a lifting device used for transporting steel materials or transporting mechanical parts, for example, and turns on and off the attraction force by magnetic force as shown in the side view of the pipe fixing device 13 in FIG. It has a switching mechanism 16. In addition, fixed flange 1
4 has a plurality of holes 14a for reducing the weight.

A cutting mechanism having a rotating body 4 attached to the upper part of the non-rotating shaft 1 of the pipe end grinding apparatus and a tool rest 8 attached to a lower part of the rotating body 4 so as to be movable in the radial and vertical directions. Has the same configuration as that of the conventional example shown in FIG.

Using this pipe end grinding device, a large number of reaction tubes 22 composed of small-diameter steel pipes are arranged at the ends such as a heat exchanger, a coal liquefaction device, and a reactor used for methanol synthesis. When grinding the surface of the flat seat 25 of the flange joint 24 attached to the end of the main body 21 made of a large-diameter pipe, first, as shown in FIG. The tube end grinding device is installed on the reaction tube 22 with the magnetic attraction force of the magnetic attraction means 15 of the fixing device 13 turned off, and the tube end grinding device is positioned with respect to the flat seat 25 of the flange joint 24. And then the magnetic attraction means 15
The magnetic attraction force is turned on to magnetically attract the reaction tube 22 to fix the tube end grinding device to the main body 21 to be machined.

Since the tube end grinding device is fixed by magnetically adsorbing the reaction tube 22 made of a steel tube disposed up to the end of the main body 21 to be machined in this way, there is no space at the end of the main body 21. Can also be reliably fixed to the main body 21 for processing the pipe end grinding device. Further, when the pipe end grinding device is positioned with respect to the flat seat 25 of the flange joint 24, the suction force by the magnetic force of the magnetic attraction means 15 is turned off, so that the positioning can be easily performed. Further, the magnetic attraction means 15 is connected to the end of the large-diameter fixed flange 14 by 3.
Or, since it is attached to four locations, the pipe end grinding device can be stably fixed with a uniform suction force.

After fixing the pipe end grinding device to the main body 21 to be machined, the tool post 8 is manually moved in the radial direction and the vertical direction, and the grinding tool 9 attached to the tool post 8 is moved to the plane of the flange joint 24. Align to seat 25. Then, the rotating body 4
A driving device 17, for example, an air-drill unit connected to the driving shaft 11 is driven to rotate the rotating body 4. The tool rest 8 is rotated along the flat seat 25 of the flange joint 24 by the rotation of the rotating body 4, and the tool rest 8 is automatically fed in synchronization with the rotation of the rotating body 4 and the tool rest 8 is fed in a radial direction at a predetermined pitch for grinding. The surface of the flat seat 25 of the flange joint 24 is smoothed by the tool 9 at a constant grinding speed. In this way, the flat seat 25 of the flange joint 24 attached to the main body 21 where the reaction tube 22 is disposed to the end and has no space can be ground by machining, so that the processing accuracy can be increased and the working time can be greatly increased. Can be shortened.

When the predetermined grinding process is completed, the suction force by the magnetic force of the magnetic attraction means 15 is turned off, and the tube end grinding device is removed from the main body 21 to be machined. When the tube end grinding device is removed from the main body 21 to be machined, the suction force by the magnetic force is turned off, so that the tube end grinding device can be easily removed.

[0016]

As described above, the present invention is used for grinding a flat seat surface or a pipe end of a flange joint attached to a pipe in which a reaction tube made of a small-diameter steel pipe is arranged to an end. In addition, because the magnetic attraction force of the magnetic attraction means of the tube fixing device provided at the lower part of the tube end grinding device magnetically attracts the reaction tube or the like and fixes the tube end grinding device to the pipe to be processed. In the case of on-site grinding, it is possible to machine a pipe in which a reaction tube made of a small-diameter steel pipe or the like is arranged up to the end which could only be processed conventionally by hand, thereby improving processing accuracy. In addition, the working time can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a bottom view of the pipe fixing device of the embodiment.

FIG. 3 is a side view of the pipe fixing device of the embodiment.

FIG. 4 is a side view showing a conventional pipe end grinding device.

FIG. 5 is a sectional view showing a reactor having a reaction tube therein.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 non-rotating shaft 4 rotating body 8 turret 13 pipe fixing device 14 fixing flange 15 magnetic attraction means 16 on / off switching mechanism 17 drive device

──────────────────────────────────────────────────の Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B24B 23/08

Claims (1)

(57) [Claims] 1. A pipe fixing device for fixing a non-rotating shaft to a pipe to be cut, and a rotating body which is rotatably mounted on the non-rotating shaft near a pipe end of the pipe to be cut and has a gear group therein. If, it possesses a tool rest which is movable, and a driving device for rotating the rotating body and in the vertical direction radial mounted on the rotating member rotating member,
From a small diameter steel pipe housed in a large diameter tubular body
Plane of the flange joint at the end of the body having a plurality of pipes
In a pipe end grinding device for grinding a seat, the pipe fixing device has a fixed flange attached to a non-rotating shaft, a permanent magnet built-in magnetic on / off switching mechanism, and attached to a lower surface of the fixed flange; Large diameter tubular
Attach and fix to the ends of the multiple pipes stored in the main body.
And a plurality of magnetic attraction means.