JP2002011667A - Pipe end polishing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe end polishing device to perform a work rapidly, neatly, and besides simply and safely, prevent pollution of peripheral environment during a work, be simply moved, and select no work place. SOLUTION: The pipe end polishing device comprises a means to inject blast balls in the direction of a pipe axis toward a pipe end 32; an injection passage 22 through which the injected blast balls pass; a dispersion core 5 to effect injection of the blast balls, injected by the injecting means, in a direction in which the blast balls are spread to the outside; an irradiation inner wall 7 of a cover 4 to irradiate a pipe end outer surface 35 with the blast balls; a plug 8 to prevent flying of the blast balls in a pipe 30; a cover 10 to prevent flying of the blast balls to the outside of the pipe end polishing device 1; a suction recovery passage 23 to suck and recover the blast balls to the opposite side to the opposite side to the pipe end 32 side; and a suction recovery passage means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe end polishing apparatus for removing insulators around a pipe end before butt welding tubes such as heat transfer tubes, that is, polishing the pipe end.

[0002]

2. Description of the Related Art In a heat exchanger tube, a water wall tube, a small-diameter nozzle, and the like constituting a heat exchanger of a boiler, butt welding is performed to connect the tubes. Before performing butt welding, a groove end to be described later is applied to a pipe end in order to facilitate a welding operation and increase a welding connection strength between pipes.

FIG. 3 is a sectional view showing a state in which pipe ends are joined to perform butt welding. In the drawings described below, those having the same functions are denoted by the same reference numerals, and the repeated description thereof will be omitted.

[0004] Reference numerals 30 and 31 denote pipes, 32 denotes a pipe end, 33 denotes a pipe end face, 34 denotes a pipe end inner face, 35 denotes a pipe end outer face, and 36 denotes a pipe 30.
Reference numeral 37 denotes a groove processing portion on the inner surface of the pipe 30, and 37 denotes a groove processing portion on the outer surface of the pipe 30. In addition, the code | symbol 33-37 attached only about the pipe | tube 30.

[0005] Pipe end face 33, pipe end inner face 34, pipe end outer face 3
5 、 Insulation such as oxide scale, rust, black scale (not shown)
If the butt welding is performed between the pipe ends 32 while the welding remains, welding defects are likely to occur. Therefore, an operation of removing the insulator, that is, a pipe end polishing operation is required.

[0006] When the pipe is in a straight pipe state, it is easy to carry the pipe and polish the pipe end, so that various pipe end polishing methods can be used. However, products such as heat transfer tubes, water wall tubes, and small-diameter nozzles after pipe bending or assembling a plurality of tubes become large. It becomes difficult. For this reason,
Prior to bending or assembling the pipe, a pipe end polishing operation is usually performed at the assembly site.

FIGS. 4 (a) and 4 (b) are views showing a conventional pipe end polishing.

In (a), 41 is a wire wheel brush, 42 is a supporting part, and in (b), 43 is a grinder and 44 is a supporting part.

FIG. 1A shows a state in which a worker holds a support portion 42 of a wire wheel brush 41 rotated by an unillustrated motor as shown by an arrow in a hand and grinds a tube end outer surface 35 of the tube 30.

FIG. 1B shows a state in which a worker holds the support portion 44 of the grinder 43 which is rotated by a motor (not shown) as shown by an arrow in a hand and polish the inner surface 34 of the tube end.

As described above, conventionally, FIGS. 4 (a) and 4 (b)
As shown in (1), the pipe end was polished manually using a grinding tool such as a wire wheel brush 41 or a grinder 43.

FIG. 5 is a cross-sectional view of a blast apparatus which is a conventional pipe end polishing apparatus.

2 is a blast device, 22 is an injection path for blast balls (not shown), and 23 is a suction and recovery path for dust (iron powder) and blast balls generated by pipe end polishing. A solid arrow indicates a blast ball injection path, and a dashed-dotted arrow indicates a dust and blast ball suction / recovery path.

The blasting device 2 includes an injection means for injecting blast balls in the pipe axis direction using compressed air or the like as a source of the injection path 22, and a dust and polished pipe end polished for a source of the suction and recovery path 23. A suction / recovery unit for suctioning and recovering the blast ball on the side opposite to the tube end is provided, but is not shown.

In the conventional blasting device 2, the blasting ball is blasted by the blasting means in the direction of the tube axis toward the tube end through the blast passage 22 to polish the tube end. The balls are sucked and collected by the suction and collection means on the side opposite to the tube end via the suction and collection path 23, and the grinding of the insulator attached to the tube end and dust collection are simultaneously performed.

[0016]

In FIG. 3, the pipe 30 requires polishing (removal of the insulator) at the pipe end face 33, the pipe inner face 34, and the pipe outer face 35.

Since the pipe 31 to be butt-welded with the pipe 30 is similarly polished, the butt-welding is performed as follows.
Two tubes must be polished. That is, as shown in FIG.
Polishing is performed with a wire wheel brush 41 or a grinder 43. Therefore, if there are many butt welds,
It takes a lot of time and costs.
In addition, since it is polished with the wire wheel brush 41 or the grinder 43 which is dangerous if touched, there is a danger, and the iron powder of the tube material and the wire of the wire wheel brush 41 are scattered at the time of polishing, so that the periphery of the workplace is easily stained.

A conventional blasting device 2 shown in FIG.
When the pipe end is polished by using the blasting device, the dust and the blast ball after the pipe end polishing are not sucked and collected properly, and the blast device 2 is used.
There is a problem that dust and blast balls scatter around and inside the pipe, and pollute the surrounding environment.

An object of the present invention is to solve the above problems,
You can work cleanly in a short time, and easily and safely.
An object of the present invention is to provide a pipe end polishing apparatus which can be easily moved without polluting the surrounding environment at the time of work and which can be used at any place.

[0020]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a pipe end polishing apparatus according to the present invention has an outer side in which blast balls injected in a tube axis direction toward a pipe end are dispersedly injected in a direction spreading outward. Dispersing means, external surface irradiating means for irradiating the blast ball to the tube end outer surface, in-pipe scattering prevention means for preventing the blast ball from scattering in the pipe, and wherein the blast ball is outside the pipe end polishing apparatus. An outer scatter prevention means for preventing scatter is provided.

Further, the pipe end polishing apparatus of the present invention provides an injection means for injecting a blast ball in a pipe axis direction, an injection path of the blast ball, and a blast ball injected toward the pipe end by the injection means. Outer dispersing means for dispersing and jetting in a direction spreading outward, outer surface irradiating means for irradiating the blast ball to the outer surface of the tube end, in-tube scattering preventing means for preventing the blast ball from scattering in the tube, and the blast ball Outside scatter prevention means for preventing scattered outside of the pipe end polishing apparatus, and suction and collection means for suctioning and collecting dust and blast balls generated by the pipe end polishing on the opposite side to the pipe end side, And a suction / recovery path.

Further, the outer dispersing means has a conical shape, is disposed at the center of the path of the blast ball to be jetted, and is pointed toward the direction in which the blast ball is jetted. And

Further, the outer surface irradiation means is constituted by an inner wall of the pipe end polishing apparatus.

Further, the means for preventing scattering in the pipe is a plug fitted to the inner surface of the pipe end, and the means for preventing scattering outside is a lid having an insertion hole at the pipe end and provided on an outer periphery of the plug. There is a feature.

Further, the stopper and the lid are made of a flexible material.

Further, the jetting means, the jetting path, the suction / recovery means, and the suction / recovery path are provided in a blast device, and the outer dispersing means, the outer surface irradiating means, the in-tube scattering preventing means, the outer scattering preventing means are provided. The means is provided on a nozzle fitted to the tip of the injection path and the suction recovery path.

In the pipe end polishing apparatus of the present invention, the blast balls sprayed toward the pipe end in the pipe axis direction are dispersed and sprayed in the direction of spreading outward by the outer dispersion means, and the blast ball is blasted on the pipe end end face and the pipe end inner face. The ball can be irradiated. Further, the blast ball can be irradiated on the outer surface of the tube end by the outer dispersion means and the outer surface irradiation means. Further, the scattered dust and the blast ball can be prevented from being scattered in the pipe by the pipe scatter prevention means. In addition, the scattering prevention means can prevent dust and blast balls after polishing from scattering outside the pipe end polishing apparatus.

Therefore, the work can be performed cleanly, easily and safely in a short time, and at the time of work, dust and blasted balls after polishing can be prevented from flying around or inside the pipe, and the surrounding environment is not polluted. A pipe end polishing apparatus that can be easily moved and can be used anywhere can be provided.

[0029]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the drawings described below, those having the same functions are denoted by the same reference numerals, and the repeated description thereof will be omitted.

FIG. 1A is a sectional view of a main part (tip) of a pipe end polishing apparatus according to an embodiment of the present invention, and FIG. 1B is a front view as viewed from the direction of arrow A in FIG.

1 is a pipe end polishing device, 2 is a blast device, 3
Is a nozzle.

Reference numeral 21 denotes a holder of the blasting device 2, reference numeral 22 denotes an injection path for blast balls (not shown), reference numeral 23 denotes a suction / recovery path for suctioning and recovering dust and blast balls generated by polishing.
24 is a reducer tube. The reducer tube 24 forms the blast ball injection path 22 and also forms the suction / recovery path 23 with the holder 2.

The nozzle 3 is connected to the holder 21 of the blasting device 2.
, That is, the injection path 22 and the suction and recovery path 24 are fitted by appropriate fitting means.

Reference numeral 4 denotes a cover (holder) of the nozzle 3 and 5 denotes an axial direction toward the pipe end 32 by an injection means (not shown; located at the source of the injection path 22) using compressed air or the like of the blast device 2. A conical dispersion core (outside dispersion means) for dispersing and ejecting the blast ball (in the direction of arrow B) in a direction to spread outward, and a core metal holding plate 6 for holding the dispersion core 5 (FIG. 1B )), 7 is a blast ball to the tube end outer surface 35.
The inner wall (external irradiation means) of the cover 4 of the nozzle 3 provided in a shape as shown in the figure (the outer surface irradiation means), 8 is fitted to the inner surface 34 of the tube end, and is made of a flexible material (elastic body) such as rubber. A plug (splash prevention means in the pipe) for preventing the blast ball from scattering inside the pipe 30; 9 is a holding rod for integrally holding the plug 8, the dispersion metal core 5, and the metal core holding plate 6 , 1
Reference numeral 0 denotes a cover (outside scattering prevention means) provided on the outer periphery of the stopper 7 and made of a flexible material such as rubber to prevent the blast ball from scattering outside the pipe end polishing apparatus 1.
1 is an insertion hole of the tube 30 in the middle of the lid 10.

The cover 4 including the irradiation inner wall 7, the dispersion core 5,
The nozzle 3 is constituted by the metal core holding plate 6, the stopper 8, the holding rod 9, the lid 10, and the like.

The pipe end polishing apparatus 1 of the present embodiment utilizes a structure in which the conventional blast device 2 simultaneously ejects blast balls and sucks and collects blast balls and dust after polishing. That is, by attaching the nozzle 3 according to the present invention to the tip of the holder 21 in which the blast ball injection path 22 and the suction / recovery path 23 are integrated, the entire pipe end polishing apparatus 1 is configured.

In the pipe end polishing apparatus 1 of the present embodiment, the pipe 3
Blasting balls sprayed from the axial direction indicated by the arrow B with respect to 0 can be polished by simultaneously irradiating three surfaces of the tube end end surface 33, the tube end inner surface 34, and the tube end outer surface 35.

Further, since the tip of the pipe end polishing apparatus 1 on the pipe 30 side is covered and closed by the pipe 30, the stopper 8, and the lid 10, dust and blast balls after polishing pass through the suction and recovery path 23. Can be collected via suction.

Hereinafter, the function of preventing dust and blast balls after polishing from scattering inside the pipe 30 and outside the pipe end polishing apparatus 1 will be described in more detail.

FIG. 2A is a sectional view of a main part (tip) before the stopper 8 and the lid 10 are fitted into the tube 30, and FIG.
It is a principal part sectional view which shows the state after fitting.

In FIG. 2, reference numeral 38 denotes a boundary portion of the groove processing portion 36.

As shown in FIG. 2A, the groove 36 on the inner surface of the tube 30 has a larger inner diameter than the other portions of the tube 30. The maximum outer diameter of the plug 8 having a truncated cone shape (that is, a tapered shape) in which the pointed portion of the cone is cut in parallel with the bottom surface of the cone is determined based on the inner diameter of the groove 36. ing. The nozzle 3 is connected to the pipe end 32 of the pipe 30.
When the plug 8 is made of an elastic material such as rubber,
As shown in (b), the pipe end 32 is compressed at the boundary 38.
Is shielded by the stopper 8. For this reason, tube 3
It is possible to prevent blast balls and dust after polishing from being mixed into the inside.

Further, an insertion hole 11 whose inner diameter is smaller by, for example, 1 mm than the outer diameter of the tube 30 is provided in the lid 10. When the nozzle 3 is inserted into the pipe end 32, the inner end (on the side of the stopper 8) of the lid 10 made of an elastic body such as rubber is placed in the state shown in FIG.
As shown in (b), the tube 30 is compressed in contact with the tube end outer surface 35, and the outside of the tube end 32 is shielded by the lid 10. For this reason, outside the pipe 30, that is, the pipe end polishing apparatus 1
It is possible to prevent the blast balls to the outside and scattering of dust after polishing.

Next, a description will be given of a pipe end polishing method using the pipe end polishing apparatus 1 of the present embodiment.

In the pipe end polishing apparatus 1 of the present embodiment,
For example, in order to polish the pipe end 32 of the pipe 30 having an outer diameter of 65 mm or less, for example, using a blast ball having a particle diameter of 500 μm or less,
As shown by the solid arrow B in FIG. 1, the fuel is injected toward the pipe end 32 in the pipe axis direction. The injection is performed using compressed air or the like. The blast ball easily hits the pipe end face 33 and the pipe end inner face 34, but hardly hits the pipe end outer face 35. Therefore, in the present embodiment, the dispersion metal core 5 for dispersing the trajectory of the blast ball to the outside and the irradiation inner wall 7 for the cover-4 for applying the blast ball to the tube end outer surface 35 are provided.
The trajectory of the blast ball ejected in the axis (arrow B) direction changes outward as indicated by arrow C by the dispersion metal core 5.
Due to this orbital change, the flow changes along the irradiation inner wall 7 of the cover 4 to the flow shown by the arrow D, and the polishing hits the pipe end outer surface 35. That is, the irradiation inner wall 7 of the cover 4 efficiently blasts the blast balls dispersed by the dispersion core 5 to the tube end outer surface 35.
To guide the flow of the blast ball to the tube end outer surface 35.
In the present embodiment, as shown in FIG.
The inner wall 7 was subjected to arc cutting to form an irradiation inner wall 7.

Dust made of insulating material such as oxide scale, rust, black scale and the like blasted by the irradiation of the blast ball, and the blast ball after polishing are sucked into the suction / recovery passage 23 as shown by the dashed line arrow E. Blasting device 2 of pipe end polishing device 1
After being collected inside, it is classified into dust and blast balls using a sieve or the like, and only the blast balls are reused for polishing again, and injection and suction recovery are repeated.

As described above, in the pipe end polishing apparatus 1 of the present embodiment, the injection means (not shown) for injecting the blast ball in the axial direction of the pipe, the injection path 22 for the blast ball, and the pipe end by the injection means. A dispersion metal core 5 (outside dispersion means) for dispersing and ejecting the blast balls toward the outside in the direction of spreading outwardly, and an irradiation inner wall 4 (outside irradiation means) on the inner surface of the cover 4 for irradiating the blast balls to the tube end outer surface 35. ), A plug 8 for preventing blast balls from scattering in the pipe 30 (in-tube scattering prevention means), and a lid 10 for preventing blast balls from scattering outside the pipe end polishing apparatus 1 (outside scattering prevention). Means), suction and collection means (not shown) for suctioning and collecting dust and blast balls generated by polishing the pipe end 32 on the side opposite to the pipe end 32 side, and a suction and collection path 23. The dispersing core 5 (outer dispersing means) has a conical shape, is disposed at the center of the path of the blast ball to be ejected, and is pointed toward the direction in which the blast ball is ejected.

With this configuration, the blast ball sprayed toward the tube end 32 in the direction of the tube axis (arrow B) is dispersedly sprayed in the direction of spreading outward by the dispersion core 5, and the tube end face 3
3 and the blast ball can be irradiated on the inner surface 34 of the tube end. Further, the blast ball can be irradiated to the tube end outer surface 35 by the dispersion core 5 and the irradiation inner wall 7. In addition, the plug 8 can prevent the dust and blast ball after polishing from scattering into the tube 30. In addition, the lid 10 can prevent dust and blast balls after polishing from scattering outside the pipe end polishing apparatus 1. That is, the plug 8 and the lid 10 are brought into close contact with the pipe end 32 to form a sealed space, and the blast ball is locally and efficiently applied to the three faces of the pipe end face 33, the pipe end inner face 34, and the pipe end outer face 35. Irradiation can be performed at the same time for polishing in a short time, and grinding and dust collection of the insulator can be performed simultaneously.

Therefore, the work can be performed cleanly, easily and safely in a short time, and during the work, dust and blast balls after polishing can be prevented from scattering around and inside the pipe, and the surrounding environment is not polluted. Workplace environment can be improved,
Without moving the enlarged product after assembly,
The pipe end polishing apparatus can be polished by the easy movement of the pipe end polishing apparatus, and the pipe end polishing apparatus can be provided regardless of the work place. Further, in the present embodiment, pipe end polishing can be performed satisfactorily in any state of a large product after processing into a single tube, a bent tube, and after assembling a plurality of tubes.

Although the present invention has been specifically described based on the embodiments, the present invention is not limited to the above-described embodiments, and it is needless to say that various modifications can be made without departing from the gist of the present invention. It is.

[0051]

As described above, according to the present invention,
Work can be done cleanly, easily and safely in a short period of time.During operation, dust and blast balls after polishing can be prevented from scattering around and inside the pipe, so that the surrounding environment is not polluted and easy to move. Thus, it is possible to provide a pipe end polishing apparatus that can be used anywhere.

[Brief description of the drawings]

FIG. 1A is a sectional view of a main part (tip) of a pipe end polishing apparatus according to an embodiment of the present invention, and FIG. 1B is a front view as viewed from the direction of arrow A in FIG.

FIG. 2A is a cross-sectional view of a main part (tip) before fitting of a stopper and a lid into a tube, and FIG. 2B is a cross-sectional view of a main part (tip) showing a state after fitting.

FIG. 3 is a cross-sectional view showing a state where pipe ends are joined to perform butt welding.

FIGS. 4A and 4B are views showing a conventional pipe end polishing.

FIG. 5 is a cross-sectional view of a blast device which is a conventional pipe end polishing device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Pipe end polishing device, 2 ... Blasting device, 3 ... Nozzle, 4
... Nozzle cover, 5 ... Dispersion core (outside dispersion means), 6
... Core metal holding plate, 7 ... Irradiation inner wall of cover inner surface (outer surface irradiation means), 8 ... Plug (scattering prevention means in pipe), 9 ... Holding rod, 10
... lid (outside scattering prevention means), 11 ... lid insertion hole, 2
DESCRIPTION OF SYMBOLS 1 ... Holder, 22 ... Blast ball injection path, 23 ... Polishing dust and blast ball suction / recovery path, 24 ... Reducer pipe, 30, 31 ... Pipe, 32 ... Pipe end, 33 ... Pipe end face,
34 ... tube end inner surface, 35 ... tube end outer surface, 36 ... tube inner surface groove processing portion, 37 ... tube outer surface groove preparation portion, 38 ... boundary portion of groove processing portion, 41 ... wire wheel brush, 42 ... Support part, 43 ... Grinder, 44 ... Support part.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B24C 9/00 B24C 9/00 D

Claims (7)

[Claims] 1. An outer dispersing means for dispersing and jetting a blast ball in a pipe axial direction toward a pipe end in a direction to spread outward, an outer surface irradiating means for irradiating the blast ball to an outer surface of the pipe end, A pipe end comprising: an in-pipe scatter prevention means for preventing the blast ball from scattering; and an outer scatter prevention means for preventing the blast ball from scattering outside the pipe end polishing apparatus. Polishing equipment. 2. Injecting means for injecting a blast ball in a tube axis direction, an injection path of the blast ball, and an outer side for dispersing and injecting the blast ball injected toward the pipe end by the injecting means in a direction to spread outward. Dispersing means, outer surface irradiating means for irradiating the blast ball to the tube end outer surface, in-pipe scattering prevention means for preventing the blast ball from scattering in the pipe, and wherein the blast ball is provided outside the pipe end polishing apparatus. External scattering prevention means for preventing scattering, suction and collection means for suctioning and collecting dust generated by the pipe end polishing and the blast ball on the side opposite to the pipe end side, and a suction recovery path. Characteristic pipe end polishing equipment. 3. The blast ball according to claim 3, wherein said outer dispersing means has a conical shape, is disposed at the center of the path of the blast ball to be jetted, and is pointed toward a direction in which the blast ball is jetted. The pipe end polishing device according to claim 1 or 2, wherein: 4. The apparatus according to claim 1, wherein said outer surface irradiating means is constituted by an inner wall of said apparatus. 5. The scatter prevention means in the pipe is a plug fitted to the inner surface of the pipe end, and the outer scatter prevention means is a lid provided with an insertion hole in the pipe end and provided on the outer periphery of the plug. The pipe end polishing apparatus according to claim 1 or 2, wherein the pipe end polishing apparatus is provided. 6. A pipe end polishing apparatus according to claim 5, wherein said stopper and said lid are made of a flexible material. 7. The jetting means, the jetting path, the suction / recovery means, and the suction / recovery path are provided in a blast device, and the outer dispersing means, the outer surface irradiating means, the in-tube scatter preventing means, and the outer scatter preventing are provided. 3. A pipe end polishing apparatus according to claim 2, wherein said means is provided in a nozzle fitted to a tip of said injection path and said suction recovery path.