JP2003191155A - Pipe polishing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe polishing device capable of simply carrying out a polishing of a surface of pipes such as fixed pipes, pipes having a vertical bar and a bent hand rail at a uniform quality, facilitating a polishing work and being used even at a narrow place. <P>SOLUTION: The pipe polishing device 10 has a frame 12, a driving device 14 and a roller chain 16. The roller chain 16 is fixed to a pivotable plate 26. Cams 22, 24 are eccentrically rotated by rotating and driving a spindle 18 by the driving device 14 and the pivotable plate 26 is continuously pivoted making a shaft 20 as a fulcrum. Thereby, the roller chain 16 provided on the pivotable plate 26 carries out a traveling (reciprocating) motion on an outer periphery of the pipe 60 and the outer periphery of the pipe 60 is polished by a polishing grinding wheel 32 provided on the roller chain 16. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe polishing device, and more particularly to a pipe polishing device for performing post-welding treatment of a welded joint in pipe processing.

[0002]

2. Description of the Related Art Conventionally, welding has generally been used as a joining method for pipes used as structural materials. Prior to welding and joining, in order to prevent deterioration of welding quality, polishing work around the joint is performed for the purpose of removing dirt, oil and fat, rust and the like at the welded portion. In addition, when pipes such as water pipes of non-polluting substances are welded and joined at a construction site, the welded joints are often inspected by nondestructive inspection after the welded joints. Particularly, in the penetrant flaw detection test for inspecting minute holes and cracks on the surface of the welded joint, it is necessary to remove the irregularities of the weld overlay, and therefore polishing work of the welded joint is performed as pre-inspection processing. In addition, safety fences and handrails composed of piping are widely used in inspection corridors of chemical plants and power plants, so that people will not be injured when walking while holding their hands. It is required to polish the welded joint smoothly.

When the welding work of these welded joints is performed on the already installed and fixed pipe, it is a work using a hand grinder or a belt sander, which is a difficult work requiring skill.

On the other hand, in the device for polishing the end portion of the pipe joint disclosed in Japanese Patent Laid-Open No. 9-17848, there is proposed a device for pressing the polishing device against the end portion of the pipe and rotating the pipe to polish the surface of the pipe. It is useful for processing material piping at construction sites.

Further, in the automatic polishing device for a pipe joint portion disclosed in Japanese Patent Laid-Open No. 7-60634, a welding device for a pipe weld joint portion is provided by a polishing device having a polishing wheel therein which is rotationally driven along the surface of the pipe. We are carrying out polishing work.

Further, another conventional pipe polishing device 9 is shown in FIG.
8 is shown. This pipe polishing device 98 has a polishing wheel 97.
The operator operates the pipe polishing device 98 to polish the welded joint portion 96 of the pipe 90.

[0007]

However, in the conventional pipe polishing apparatus as described above, Japanese Patent Application Laid-Open No. 9-11784 has been proposed.
In the polishing device as disclosed in Japanese Patent Publication No. 8, since the pipe itself needs to be rotated, it cannot be used for fixed pipes or safety fences already installed, and the end of the pipe is not exposed. Had the drawback of not being able to mount the device.

Further, in the polishing device as disclosed in Japanese Patent Application Laid-Open No. 7-60634, it is necessary to equip the device with a motor and a deceleration mechanism that give a sufficient torque in order to rotate and drive along the surface of the pipe. However, there is a problem in that polishing work is troublesome due to the large size.

Further, as shown in FIG. 6, when the pipe 90 is bent and installed, it is difficult to polish the pipe polishing device 98 around the welded joint portion 96 of the pipe 90. Therefore, there is a drawback in that some portions cannot be polished.

Further, with the above-described conventional polishing apparatuses, it is difficult to work, for example, in pipes installed in the ceiling or in narrow spaces where pipes are adjacent to each other.

The present invention has been made in view of the above circumstances, and can easily and uniformly polish the surface of a fixed pipe, a pipe having a vertical crosspiece, or a bent handrail. It is an object of the present invention to provide a pipe polishing device that is small in size and can easily perform polishing work and can be used even in a narrow place.

[0012]

In order to achieve the above-mentioned object, the invention as set forth in claim 1 is characterized in that a device main body is detachably attached to a pipe, and both ends thereof are wound around the pipe and attached to the device main body. A strip-shaped polishing means, and a traveling means that is attached to the apparatus main body and that causes the polishing means to travel with respect to the pipe.

According to the present invention, since the strip-shaped polishing means is provided so as to run around the pipe, the surface of the pipe such as the fixed pipe can be polished with uniform quality, and the apparatus itself is small. The polishing work can be performed even in a narrow place.

According to the second aspect of the invention, since the apparatus body is provided with the adjusting means for adjusting the pressing force of the polishing means against the pipe, the pressing force can be set to an optimum value.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a pipe polishing apparatus according to the present invention will be described below with reference to the accompanying drawings.

The pipe polishing apparatus 10 of the embodiment shown in FIG.
Is a frame 12, a drive device 14,
It has a roller chain 16 as a polishing means, and is detachably fixed to the pipe 60 by clamps 70, 70.

The clamps 70, 70 can be opened and closed with an adjusting screw 72, and the pipe polishing apparatus 10 can be attached to the pipe 60 by tightening the adjusting screw 72.

As shown in FIG. 2, the frame 12 is provided with a drive device 14, cams 22 and 24, and a rocking plate 26 which constitute a traveling means. The drive device 14 is an air motor that generates a driving force by compressed air, and by supplying compressed air to the drive device 14 from an air pump (not shown) via the pipe 13, the spindle 18 of the drive device 14 is rotated at high speed. In addition, the spindle 18 is provided with cams 22 and 24 formed in a disk shape. The cams 22 and 24 are eccentric cams in which the centers of the cams 22 and 24 are eccentric with respect to the spindle 18, and the phase difference is set to 180 °.

Further, a shaft 20 is provided on the frame 12, and a swing plate 26 is swingably provided on the shaft 20. The above-mentioned cams 22 and 24 are arranged so as to abut on the upper and lower parts of the swing plate 26, and when the drive device 14 is driven, the cams 22 and 24 are eccentrically rotated and the cam 2
The oscillating plate 26 that abuts on the side peripheral portions 2 and 24 can be continuously oscillated around the shaft 20.

A pressing force adjusting spring 29 is provided below the rocking plate 26 as an adjusting means for adjusting the pressing force of the roller chain 16.
Is provided. The pressing force adjusting spring 29 has one end rotatably supported by a fixed portion 28 below the swing plate 26, and the other end of the pressing force adjusting spring 29 is fixed to the roller chain 16.

After the roller chain 16 is wound around the surface of the pipe 60, the other end of the roller chain 16 is oscillated by the swing plate 2.
6 is detachably supported by a pin support portion 30 provided on the upper portion.

As shown in FIG. 4, the pin support portion 30 is formed in a pin support shape that matches the shape of the roller 17 of the roller chain 16. Further, fixing screws 42, 42 and a retaining plate 44 are provided in the vicinity of the pin supporting portion 30. After the roller chain 16 is supported by the pin supporting portion 30, the retaining plate 44 is screwed by the fixing screws 42, 42. By doing so, the roller chain 16 is firmly supported by the swing plate 26. Here, if the roller chain 16 has an extra length in advance, the position of the roller chain 16 with respect to the pin support portion 30 can be adjusted, and various pipe diameters can be accommodated.

The roller chain 16 is formed by connecting a plurality of chain portions 16a having the polishing grindstone 32 shown in FIG. 5, and the polishing grindstone 32 is brought into contact with the surface of the pipe 60 so that the roller chain 16 travels (reciprocates). By performing the movement (arrow A), the weld overlay 62 protruding on the surface of the pipe 60 is polished by the polishing grindstone 32. Here, examples of the polishing whetstone 32 include those made of a black whetstone or ceramic, a diamond whetstone, or a cermet sintered body. Further, if the recess 32a is formed in accordance with the shape of the weld overlay portion 62 as shown in the polishing grindstone 32, stable polishing can be performed without shifting the polishing position, and the work is not complicated. In this case, separately, finish polishing is performed with a planar grinding stone. Further, by forming the recess 32b in the polishing grindstone 32 along the curved surface of the pipe 60, a more stable polishing operation can be performed. The recess 32b does not necessarily have to match the curvature of the pipe 60, and it is effective if it is formed along the curved surface direction. Instead of the grinding wheel 32, a flat plate wound with sandpaper may be used and attached to the chain portion 16a.

In FIG. 3, a pressing force adjusting screw 34 is provided as an adjusting means for adjusting the pressing force of the roller chain 16. The pressing force adjusting screw 34 is rotatably held by a clamp 70 and screwed into a screw hole 38 formed in the frame 12. A slide shaft 36 is arranged near the pressing force adjusting screw 34 in parallel with the pressing force adjusting screw 34 (see FIG. 1). The slide shaft 36 is fixed to the clamp 70 and the frame 1
It is fitted in the slide hole 40 formed in 2. By adjusting the position adjusting screw 34, it is possible to adjust the distance between the frame 12 supported by the slide shaft 36 and the clamp 70 (pipe 60), and thus the roller chain 16 wound around the pipe 60 is pushed. The pressure can be adjusted, and the piping 60 described below can be satisfactorily polished.

Since the pipe polishing apparatus 10 has such a structure, the roller chain 16 can be moved (reciprocated) along the surface of the pipe 60 by driving the drive unit 14.

The operation of the pipe polishing device 10 configured as described above will be described.

The clamps 70, 70 are opened and closed by the adjusting screw 72 to be clamped by the pipe 60, and the adjusting screw 72 is tightened to fix the pipe polishing device 10 to the pipe 60. The clamp 70 can be attached to pipes having different diameters. Further, the clamp 70 is arranged at a position about 20 mm in the pipe direction from the position where the pipe 60 is polished, and even if the pipe 60 is bent (see FIG. 6), it is 70
The pipe polishing device 10 can be mounted if there is a straight pipe portion of about millimeter.

Next, the roller chain 16 is wound around the pipe 60 and mounted, and is supported by the pin support portion 30 of the rocking plate 26 as shown in FIG. Support. At this time, the roller chain 16
Roller chain 1 so that the slack in the roller chain is minimized
Adjust the support position of 6. Further, the pressing force adjusting screw 34 is operated to adjust the pressing force of the roller chain 16. By tightening the pressing force adjusting screw 34, the frame 12 moves away from the pipe 60 along the slide shaft 36, and it is possible to adjust the pressing force of the roller chain 16 according to the polishing strength and the degree of wear of the polishing grindstone 32. You can make adjustments. Here, the pressing force of the roller chain 16 is preferably adjusted to such a pressing strength that the roller chain 16 can move (reciprocate) with respect to the pipe 60. A pressing force adjusting spring 29 is attached to the roller chain 16.
With the provision of, the pressing strength can be easily adjusted and a predetermined pressing strength can be maintained.

As described above, the pipe polishing device 1 is attached to the pipe 60.
When the drive device 14 is driven after mounting 0, the spindle 1
The cams 22 and 24 formed in 8 rotate, the swing plate 26 continuously swings, and the roller chain 16 provided on the swing plate 26 travels (reciprocates) on the surface of the pipe 60, and The surface of the pipe 60 is polished by the polishing grindstone 32 provided on the pipe 16. This allows the welded joint of the pipe 60 to be polished with uniform quality.

According to the pipe polishing apparatus 10 thus constructed, approximately half of the surface of the pipe 60 can be polished by one mounting, and the entire circumference of the pipe 60 can be polished by reversing and mounting again. . Further, even if the roller chain 16 and the polishing grindstone 32 are combined, the protruding height of the device from the surface of the pipe 60 is about 30 to 40 mm, and the present device can be applied if the distance from the adjacent pipe is more than that. it can.

The pipe polishing apparatus according to the present invention described above is not limited to the above embodiment. For example, the traveling means including the drive device 14 and the oscillating plate 26 is used as the mechanism for moving (reciprocating) the roller chain, but the present invention is not limited to this, and instead a sliding mechanism such as an air cylinder is used as the traveling means. It may be provided as.

It is also possible to provide a sprocket in the main assembly of the apparatus that meshes with the endless roller chain and is driven to rotate, and run the endless roller chain around the pipe in one direction to polish the pipe.

Further, as a polishing means, a roller chain 16
However, a resin belt having a strong tension such as a timing belt may be used.

If a dustproof cover is provided so as to surround each roller chain 16 and a polishing dust collecting device is additionally provided, the polishing dust can be easily collected and the working environment is greatly improved. .

Furthermore, in the present embodiment, as the drive unit 14, an air motor which gives a driving force by compressed air is used, but the present invention is not limited to this, and an AC motor may be used.
In this case, a separately provided compressed air blowing means is unnecessary.

[0036]

As described above in detail, according to the pipe polishing apparatus of the present invention, the strip-shaped polishing means is provided so as to be able to run around the pipe, and thus the pipe having the fixed pipe and the vertical bar is provided. In addition to being able to polish the pipe surface of the welded joint easily and uniformly with respect to the bent handrail, the device itself is small and the polishing work is easy, and the polishing work can be performed even in a narrow place. . Further, since the pressing force adjusting means of the polishing means is provided, the pressing force of the polishing means with respect to the pipe can be set to an optimum value, and it is possible to cope with different pipe diameters.

[Brief description of drawings]

FIG. 1 is a perspective view showing a pipe polishing device according to an embodiment of the present invention.

FIG. 2 is a front view showing a pipe polishing device according to an embodiment of the present invention.

FIG. 3 is a plan view showing a pipe polishing device according to an embodiment of the present invention.

FIG. 4 is a perspective view showing details of an oscillating plate of the pipe polishing device according to the embodiment of the present invention.

FIG. 5 is a perspective view showing a polishing grindstone according to an embodiment of the present invention.

FIG. 6 is a side view showing a pipe polishing device as a conventional technique.

[Explanation of symbols]

10 ... Pipe polishing device, 12 ... Frame (device main body), 1
4 ... Drive device (traveling means), 16 ... Roller chain (polishing means), 18 ... Spindle (traveling means), 22, 24
... Cam (traveling means), 26 ... Oscillating plate (traveling means), 29
... pressing force adjusting spring (pressing force adjusting means), 34 ... pressing force adjusting screw (pressing force adjusting means), 60 ... piping

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3C049 AA02 AA09 AA11 AA12 AA14                       AA16 CA02 CB03 CB05                 3C058 AA02 AA09 AA11 AA12 AA14                       AA16 CA02 CB03 CB05

Claims (3)

[Claims] 1. A device main body detachably attached to a pipe, a strip-shaped polishing means wound around the pipe and attached to both ends of the device main body, and the polishing means attached to the device main body to the pipe. A pipe polishing device comprising: a traveling unit that travels against the pipe. 2. The running means is swingably provided on the apparatus main body, and has a swing plate to which both ends of the polishing means are fixed, and abutting against the swing plate for rotation driving. The pipe polishing apparatus according to claim 1, further comprising: an eccentric cam that oscillates the oscillating plate around an oscillating fulcrum, and a rotary drive source that rotates the eccentric cam. 3. The pipe polishing device according to claim 1, wherein the device body is provided with an adjusting device for adjusting a pressing force of the polishing device against the pipe.