JP2002120113A - Scraper for synthetic resin pipe - Google Patents

Abstract

(57) [abstract] (with correction) [Problem] A synthetic resin pipe from which the outer surface of the pipe end can be scraped is
Even if it is slightly deformed, the scrape allowance is constant, and the scraper can scrape the pipe surface of a predetermined length in one round and can observe the state visually, suitable for synthetic resin pipes, especially polyethylene pipes To provide a scraper applied to. SOLUTION: The rotary spiral blade, a cylindrical holding member, a gap adjusting screw, a main rotary shaft, a transmission, and a handle are provided, and the rotary shaft of the rotary spiral blade is parallel to the main rotary shaft. And the rotational speed of the rotary helical blade is set to be greater than the rotational speed of the main rotary shaft, and the cutting edge of the rotary helical blade cuts into the outer surface of the synthetic resin pipe by a predetermined cutting allowance. Then, when the main rotary shaft is rotated by turning the handle, the rotary helical blade rotates and orbits the outer peripheral surface of the synthetic resin tube while deleting the outer peripheral surface of the end portion of the synthetic resin tube.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of welding a synthetic resin pipe, particularly a pipe made of polyethylene, polypropylene or the like, to a joint with a joint so that the outer surface of the end of the pipe can be easily welded. The present invention relates to a scraper for a synthetic resin pipe for eliminating only the thickness of the scraper.

[0002]

2. Description of the Related Art In recent years, polyethylene pipes have been widely used as pipe materials for water distribution, water supply, drainage, gas, etc. among synthetic resin pipes. In this piping, a so-called fusion bonding method is used in which a material is heated and melted and joined to connect a tube made of the same material or a tube or a joint. In this case, the joining strength may be insufficient unless the stains on the surface to be fused are removed, and it is necessary to perform a work (scraping) to thinly scrape the outer surface of the tube of the fusion joint before joining. .

[0003] As a jig for performing this scraping,
For example, in the scraper disclosed in JP-A-6-179118, the scraper body is supported by the outer surface of the pipe, and the cutting blade is rotated while cutting into the pipe surface to scrape the pipe surface thinly. There is a problem in that the scraping cost is not constant in a pipe that is not formed, and when the deformation is severe, some parts cannot be creped.

Japanese Patent Application Laid-Open No. 11-351484 discloses a scraper that removes burrs (chamfering) on the pipe end face simultaneously with scraping. In this scraper, the scraper body is supported by the outer surface of the pipe. Since the cutting surface is thinned by rotating the cutting blade while digging into the tube surface, if the tube is deformed, there is a problem that unevenness of scraping margin occurs and chamfering of the tube end surface becomes insufficient.

In both of the above two examples, the cutting surface is difficult to visually check because the cutting blade is inside the main body, and the pipe surface is cut to a predetermined length because the cutting width of the cutting blade is narrow. Therefore, it was necessary to make many cutting blades orbit around the pipe.

[0006]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the conventional scraper, and the scrape allowance is constant even if the synthetic resin tube whose end outer surface is scraped is slightly deformed. Has been made for the purpose of providing a scraper suitably applicable to a synthetic resin pipe, particularly a polyethylene pipe, which can scrape off a pipe surface of a predetermined length in one round, and can observe the state visually. is there.

[0007]

According to a first aspect of the present invention, there is provided a synthetic wood pipe scraper (invention 1) having a plurality of spiral cutting blades provided on an outer peripheral surface thereof. There is a rotating helical blade that rotates in the circumferential direction in the direction that the cutting edge of the cutting blade is oriented around its central axis, and the outer peripheral surface of the pipe end is expanded and pressed against the inner surface of the synthetic resin pipe. A possible cylindrical retainer, a gap adjusting screw for varying the distance between the cutting edge of the rotary helical blade and the outer peripheral surface of the retainer, and a central axis on an extension of the central axis of the cylindrical retainer A main shaft having a central axis separated from the main shaft, a transmission for connecting the main shaft with the main shaft, and a handle for rotating the main shaft. When the rotation axis and the main rotation axis are parallel And the rotational speed of the rotary spiral blade is set to be greater than the rotational speed of the main rotary shaft, and the cutting edge of the rotary spiral blade cuts into the outer surface of the synthetic resin pipe by a predetermined cutting allowance. When the handle is turned to rotate the main rotary shaft, the rotary helical blade rotates to orbit the outer peripheral surface of the synthetic resin pipe while deleting the outer peripheral surface of the end portion of the synthetic resin pipe. It is a scraper.

According to a second aspect of the present invention, there is provided a scraper for a synthetic resin pipe (invention 2), in which a cylindrical body having a plurality of spiral cutting blades provided on an outer peripheral surface has a cutting edge of the cutting blade facing the center axis thereof. A rotary spiral blade that rotates in the circumferential direction, a cylindrical rotary presser, a gap adjusting screw that varies the distance between the cutting edge of the rotary spiral blade and the outer peripheral surface of the cylindrical rotary presser, and the cylindrical rotary press. A main rotating shaft that is on the center axis of the holding member and rotates the rotating holding member, a transmission that connects the main rotating shaft and the rotating shaft of the rotary spiral blade, and a handle that rotates the main rotating shaft, The rotating shaft of the rotating spiral blade is parallel to the main rotating shaft and connected by a transmission so that the rotating speed of the rotating spiral blade is greater than the rotating speed of the main rotating shaft. And pressed above The outer peripheral surface of the tool clamps the outer wall of the synthetic resin pipe whose outer surface is removed, and the cutting edge of the rotary helical blade cuts into the outer surface of the synthetic resin pipe by a predetermined cutting allowance. When the main rotating shaft is rotated by turning the handle, the cylindrical rotary retainer rotates and orbits the inner peripheral surface of the synthetic resin tube, and at the same time, the rotary helical blade rotates to rotate the outer peripheral surface of the end of the synthetic resin tube. A scraper for a synthetic resin pipe, wherein the whole scraper orbits along the pipe wall of the synthetic resin pipe while being deleted.

(Operation) In the scraper according to the first aspect of the present invention, the cylindrical retainer is uniformly pressed against the inner peripheral surface of the synthetic resin pipe whose outer peripheral surface is removed by expanding the diameter of the cylindrical retainer. In addition, since the distance between the outer peripheral surface of the holding member and the cutting edge of the cutting blade is constant during the rotation of the cutting blade, even if the pipe is slightly deformed, the scraping margin on the outer surface of the pipe cannot be uneven. In addition, the cutting blade is a cylindrical rotary helical blade in which a cylindrical body provided with a plurality of helical cutting blades on the outer peripheral surface rotates in the circumferential direction in a direction in which the cutting edge of the cutting blade is oriented around its central axis. Therefore, the outer surface of the tube having a required length can be scraped off in one round, and the appearance can be visually observed.

In the scraper according to the second aspect of the present invention, the synthetic resin pipe whose outer surface is removed is sandwiched between the rotary presser and the cutting edge of the cutting blade, and the entire scraper is formed on the pipe wall. Scraping off the outer surface of the pipe end
In addition, since the distance between the outer peripheral surface of the rotary presser and the cutting edge of the cutting blade is constant during the rotation of the cutting blade, even if the pipe is slightly deformed, the main body moves in accordance with the deformation and the scrape margin is not uneven. In addition, the cutting blade is a cylindrical rotary helical blade in which a cylindrical body provided with a plurality of helical cutting blades on the outer peripheral surface rotates in the circumferential direction in a direction in which the cutting edge of the cutting blade is oriented around its central axis. Therefore, the outer surface of the tube having a required length can be scraped off in one round, and the appearance can be visually observed.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial cross-sectional side view of one example of the scraper for a synthetic resin pipe of the first invention.

The scraper according to the first aspect of the present invention comprises a main frame 11 having a main rotating shaft 111 attached to the main rotating shaft 111.
A cylindrical holding member 12 is provided coaxially with the shaft, and a cylindrical holding member 12 is provided. A rotating spiral blade holder 13 slidable in a direction perpendicular to the main rotating shaft 111 is provided on the main body frame 11, and the rotating spiral blade holder 13 includes: The transmission 14 mounted on the main frame 11 allows the rotary helical blade 131 to rotate faster than the rotation speed of the main rotary shaft 111 and in the opposite direction as the main rotary shaft 111 rotates.
1, the rotary spiral blade holder 13 has a gap adjusting screw 15 to change the distance between the cutting edge of the cutting blade 1311 and the outer peripheral surface of the presser 12, and the rotary spiral blade holder 13 is attached to the end of the main rotary shaft 111 protruding from the main body frame 11. Has a detachable rotary handle 16 attached thereto.

[0013] The scraper of the present invention can be used in a pipe fusion splicing work site, and is desirably lightweight and robust. For this reason, it is desirable to use lightweight metals such as aluminum and duralumin as the material of the main members constituting the main body, but this is not the case with a small scraper.
In addition, since the rotary helical blade has a role of shaving the outer surface of a synthetic resin pipe such as polyethylene, for example, steel, stainless steel, and blade steel such as tungsten steel is used, and ball bearings, spirals, spring rings, and the like are used. Other members are iron,
Steel, brass, stainless steel, aluminum or the like may be used.

The central axis of the main rotating shaft 111 integrated with the main body frame 11 is a central axis which is on an extension of the central axis of the cylindrical retainer 12 and is separated from the central axis 121 of the cylindrical retainer. A handle 16 for projecting outward from the main body frame 11 and for rotating the main rotary shaft 111 is detachably attached thereto. The main rotary shaft 111 rotates more than the rotational speed of the main rotary shaft 111 on the main frame 11 side. The transmission 14 is mounted so that the rotating spiral blade 131 rotates in the direction opposite to the main rotating shaft 111, and the main body frame 11 rotates when the main rotating shaft 111 rotates.

FIG. 2 shows an example of the presser 12. FIG.
2A shows a state where the diameter of the holding member 12 is expanded, and FIG.
(B) shows a state where the diameter of the holding tool 12 is reduced. The holding member 12 is formed in a cylindrical shape capable of being pressed against the inner surface of the synthetic resin tube P whose diameter is enlarged and the outer peripheral surface of the tube end is removed.
Reference numeral 21 is coaxial with the main rotating shaft 111 and is separated from the main rotating shaft 111 so that the holding member 12 does not rotate even when the main rotating shaft 111 rotates. For example, in the example of FIG. 1, the main rotation shaft 111 is hollow, and the center shaft 121 of the holding member 12 is supported by, for example, a ball bearing 1211 or the like, and is coaxially mounted on the main rotation shaft 111. .

The holding member 12 has a slanted rod-shaped central shaft 121 whose outer surface is an inclined surface whose diameter is reduced in the pushing direction. The holding member 12 is screwed into the spiral of the main shaft 121 to move on the main shaft 121 in the axial direction. A possible push screw 122 and a plurality of radially expanding plates 123 whose inner surface is an inclined surface coinciding with the inclined surface of the outer surface of the push screw 122 and whose outer surface is parallel to the central axis of the main shaft 121 and divided in the axial direction. And a plurality of divided holding plates 124 detachably mounted on the enlarged-diameter plate 123.
And a stop plate 124 for preventing the enlarged diameter plate 123 from coming off the main shaft 121. The enlarged diameter plate 123 is mounted on the push screw 122 by an elastic ring 1231 such as a ring-shaped spring.

As shown in FIG. 2A, when the push screw 122 is turned to move along the main shaft 121 in the direction of the stop plate 124, the diameter of the push screw 1 is increased.
When the push-in screw 122 is further pushed in, the large-diameter plate 123 attached to the inclined surface 22 moves along the main shaft 122 and does not move any further when it hits the stop plate 124. The diameter expansion plates 123 expand along the inclined surfaces. The holding plate 125 mounted on the outer peripheral surface of the enlarged diameter plate 123 is pressed against the inner peripheral surface of the pipe P whose outer surface is shaved off by expanding the diameter of the enlarged diameter plate 123, and the main body frame 11 is It is fixed to the pipe end.

When the end outer surface of the pipe P has been cut off, the push screw 12 is turned off as shown in FIG.
Turn 2 in the reverse direction to return on the spindle 121. Expanding plate 12
3 is wound around the elastic ring 1231 so that its diameter is reduced along the inclined surface, the pressing plate 125 is separated from the inner peripheral surface of the pipe P, and the main body frame 11 is separated from the pipe end of the pipe P. You.

The rotary spiral blade 131 is a cylindrical body having a plurality of spiral cutting blades 1311 provided on the outer peripheral surface thereof.
The cutting blade 1311 is configured to rotate in the circumferential direction in the direction in which the cutting edge of the cutting blade 1311 is oriented around 32. Usually, in order to improve the cutting effect, the rotation direction of the rotary spiral blade 131 is set to be opposite to the rotation direction of the rotary spiral blade 131. The rotary spiral blade 131 is attached to the rotary spiral blade holder 13, and the rotary spiral blade holder 13 is inserted into the groove 113 of the main body frame 11 so as to be movable along the groove 113. The distance from the outer peripheral surface of the tool 12 is variable.

The gap adjusting screw 15 changes the distance between the cutting edge of the cutting blade 1311 and the outer peripheral surface of the presser 12. For example, as an example, a groove 113 is provided in the main body frame 11, a rotary spiral blade holder 13 is inserted into this groove, and the gap adjusting screw 1 is inserted into the frame main body 11 through a through hole provided in the rotary spiral blade holder 13.
There is a method in which the screw 5 is screwed in and the gap adjusting screw 15 is turned so that the rotary spiral blade holder 13 can be moved along the groove 113.

A transmission 14 is incorporated in the rotary spiral blade holder 13. The transmission 14 connects the rotating shaft 132 of the rotating spiral blade 131 and the main rotating shaft 111, and determines the rotating spiral blade 13 based on the rotation speed of the main rotating shaft 111.
1 is a transmission device in which the number of rotations of the rotary spiral blade 131 is increased and the rotation direction of the rotary spiral blade 131 is opposite to the rotation direction of the rotary spiral blade 131. As a method, for example, as an example, a large-diameter gear 141 fixed to the central axis 121 of a cylindrical holding member and a small-diameter gear 142 attached to a rotary shaft 132 of a rotary helical blade.
Are connected via a planetary gear 143, and the gear ratio between the large-diameter gear 141 and the small-diameter gear 142 is appropriately set. In this case, the rotating helical blade holder 13 moves in the direction of the main body frame 11 by the gap adjusting screw 15 to be described later to change the distance between the large-diameter gear 141 and the small-diameter gear 142. Gear 142
For example, it must be provided so as to be freely movable along a stay (not shown) or the like attached to the main body frame 11 so as to be movable between them.

A handle 16 for rotating the main rotary shaft 111 is detachably attached to an end of the main rotary shaft 111 projecting from the main frame 11. As one example, as one example, one end of the main rotating shaft 111 is formed in a rectangular rod shape as usual, and a rectangular hole that fits into one end of the handle stay 161 is opened and inserted, and the other end of the handle stay 161 is inserted. The handle 16 is attached to the vehicle, and can be manually rotated. Also, the pipe P from which the outer surface of the end is scraped has a large diameter,
It is even more convenient that a hand motor or the like can be connected in place of the manual handle as necessary, such as when the work place cannot secure a space for rotating the handle 16.

Next, a method of using the scraper of the first aspect will be described. The cylindrical holding member 12 having a reduced diameter is inserted into the pipe end of the pipe P whose outer surface is cut off, and the pressing screw 122 is rotated to expand the diameter of the holding plate 125. 11 is fixed. Next, the rotary spiral rotary spiral blade holder 13 is inserted into the groove 11 of the main body frame 11.
3 and the gap adjusting screw 15 is inserted into the rotary spiral blade holder 13.
Is screwed into a screw hole of the main body frame 11 through a through hole provided in the
The cutting blade 13 is brought into contact with the outer surface of the
11 into the outer surface of the pipe P and lock nut 151
To fix the position of the rotary spiral blade 131. At this time, the planetary gear 143 moves freely, and the small-diameter gear 142 of the rotary spiral blade holder 13, the planetary gear 413 and the large-diameter gear 142 of the main body frame 11 mesh with each other.

When the handle stay 161 is mounted on the main rotating shaft 111 projecting from the main body frame 11 and the handle 16 is rotated, the main body frame 11 rotates about the central axis 121 of the holding member 12 and rotates accordingly. The spiral blade holder 13 goes around the outer peripheral surface of the pipe P. At the same time, the small-diameter gear 412 orbits around the large-diameter gear 411 via the planetary gear 413, and the rotary helical blade 131 rotates more than the rotation speed of the main rotary shaft 111 by the gear ratio.
That is, the cutting blade 1311 rotates while rotating around the outer peripheral surface of the pipe P, and scrapes the outer surface of the pipe end at a predetermined cutting margin.

When the cutting of the outer surface of the pipe end is completed, the gap adjusting screw 15 is loosened and the rotary spiral blade holder 1 is rotated.
3 is removed, the pushing screw 122 is loosened to reduce the diameter of the holding member 12, and the main body frame 11 is removed from the end of the tube to complete the operation.

FIG. 3 is a side view of the scraper for a synthetic resin pipe according to the second embodiment of the present invention. The scraper according to the second aspect of the present invention includes a main frame 21, a main rotary shaft 211, a rotary helical blade 231 having a rotary shaft parallel to the main rotary shaft 211, and a cylindrical rotary holder having a rotary shaft parallel to the main rotary shaft 211. Tool 22 is provided, and the rotary spiral blade 231 is driven by a transmission 24 attached to the main body frame 21 such that the rotational speed of the rotary spiral blade is faster than the rotational speed of the main rotary shaft 211 and is rotatable in the opposite direction. The cylindrical rotary presser 22 is connected to the rotary shaft 21, and the cylindrical rotary presser 22 is mainly driven by a power transmission device 25 attached to the main body frame 21 so that the rotation direction of the presser 22 is the same as the rotation direction of the main rotary shaft 211. The cutting edge of the rotary helical blade 231 and the rotary presser 22 are connected to the rotary shaft 211 by a gap adjusting screw 26 attached to the main body frame 21. The distance between the outer peripheral surface is variable, an end of the main rotating shaft 211 protruded from the main body frame 21 detachable rotation handle 2
7 is attached.

The rotation speed of the rotary helical blade 231 is provided on the main frame 21 side shaft of the main rotary shaft 211.
And the power transmission so that the rotation direction of the transmission 24 and the rotation presser 22 is the same as the rotation direction of the main rotation shaft 21 so that the rotation speed is greater than the rotation speed of the main rotation shaft 211. A device 25 is attached.

The rotary spiral blade 231 has a cylindrical body having a plurality of spiral cutting blades 2311 provided on the outer peripheral surface thereof.
The cutting blade 2311 is configured to rotate in the circumferential direction in a direction in which the cutting edge of the cutting blade 2311 is oriented around 32. Usually, in order to improve the cutting effect, the rotation direction of the rotary spiral blade 231 is set to be opposite to the rotation direction of the rotary spiral blade 231.

The rotary shaft 232 of the rotary spiral blade 231 is attached to the main body frame 21 and is connected to the main rotary shaft 211 via the transmission 24. The transmission 24 is a transmission in which the rotation speed of the rotary spiral blade 231 is greater than the rotational speed of the main rotary shaft 211 and the rotational direction of the rotary spiral blade 231 is opposite to the rotation direction of the rotary spiral blade 231. For example, as an example, a large-diameter gear 241 is attached to the main rotary shaft 211 and a small-diameter gear 242 is attached to the rotary shaft 232 of the rotary spiral blade 231, and the gear ratio between the large-diameter gear 241 and the small-diameter gear 242 is set appropriately. There is a method such as doing.

The cylindrical rotary presser 22 clamps a tube end tube wall of a pipe P whose end outer surface is scraped off between the outer peripheral surface of the rotary presser 22 and the rotary helical blade 231, and Is rotated so that the scraper main body orbits along the end face of the pipe P. Therefore, it is desirable that the outer peripheral surface of the rotary presser 22 be laminated with a material having a large dynamic friction coefficient so as not to slip when rotated by being pressed against the pipe. For example, natural rubber, synthetic rubber, etc. (not shown) It is desirable to be finished with.

The gap adjusting screw 26 changes the distance between the cutting edge 2311 of the rotary spiral blade 231 and the outer peripheral surface of the rotary holder 22. For example, as an example, a groove 212 is provided in the main body frame 21 and the groove 2 is formed.
12, the gap holder screw 222 is inserted into the frame body 21, the gap adjusting screw 26 is screwed into the frame main body 21, the tip of which is brought into contact with the edge of the holder holder 22, and the gap adjusting screw 26 is turned to turn the gap holder screw 22. The groove 212
And the like.

A power transmission device 25 is incorporated in the holder 22. The power transmission device 5 connects the rotary holder rotating shaft 221 and the main rotating shaft 211, and for example, as an example, the main rotating shaft 211
And a secondary pulley 252 attached to the rotary retainer rotating shaft 221 via a tension pulley 253, for example, connected by a timing belt 254 or the like. In this case, since the holding member holder 222 is moved in the direction of the main body frame 21 by the gap adjusting screw 26 to change the distance between the primary pulley 251 and the secondary pulley 252, the tension pulley 2
53 must be provided so that it can move freely between the primary pulley 251 and the secondary pulley 252, for example, along a stay (not shown) attached to the main body frame 21 or the like. Must.

The rotary presser 22 is inserted into the pipe P, sandwiches the wall of the pipe P with the rotary helical blade 231, and rotates the scraper body along the end face of the pipe P. In the case of this example, since the rotary presser 22 is a so-called cantilever support, there is a possibility that the shaft will be displaced during the orbit, and the traveling direction of the main body frame 21 will not be perpendicular to the axial direction of the pipe P. In this case, for example, as shown in FIG. 4 (a), the rotary holding tool 22 has two rotary shafts 221 and the two rotary shafts 221 and 221 ′ and the rotary shaft 232 of the rotary spiral blade 231. If the pipe P is clamped by the above, the twisting of the shaft can be prevented, and thus the pipe P may be used. In this case,
Two power may be applied to the presser rotating shaft 221, and only one may be used.

Alternatively, as shown in FIG. 4B, the number of the rotary helical blades 231 may be two, and the wall of the pipe P may be sandwiched between the rotary shaft 221 of the single rotary presser 22. However, in this case, the shaving allowance becomes unstable, so it may be applied when the allowable range of the shaving allowance is large.

The handle 27 for rotating the main rotary shaft 211 is detachably attached to an end of the main rotary shaft 211 projecting from the main body frame 21. For example, as one example, one end of the main rotating shaft 211 is formed in a rectangular rod shape as usual, and a rectangular hole to be fitted to the one end surface of the handle stay 271 is opened and inserted, and the other end of the handle stay 271 is inserted. And the like, which can be manually rotated by attaching a handle 27. Also,
When the pipe P from which the outer surface of the end is scraped is large in diameter, or when the working place cannot secure a space for rotating the handle, a hand motor can be connected instead of a manual handle as necessary. It is even more convenient if it is done.

Next, a method of using the scraper of the second aspect will be described. Loosen the gap adjustment screw 26, and turn the rotation
And the rotary spiral blade 23 are inserted with the widened gap sandwiching the pipe end wall of the pipe P from which the outer surface of the pipe end is to be cut off, and the gap adjusting screw 26 is screwed in so that the rotary retainer is attached to the inner wall of the pipe wall. And the cutting edge of the cutting blade 2311 of the rotary spiral blade 231 is cut into the outer surface of the pipe P so as to have a predetermined cutting margin. At this time, the tension pulley 253 of the belt 254 connecting the primary pulley 251 and the secondary pulley of the rotary shaft 221 of the rotary holder 22 is tensed by free movement.

When a handle stay 271 is attached to the end of the main rotary shaft 211 and the handle is rotated, the rotary shaft 221 of the rotary presser 22 is rotated by the power transmission device 24 in accordance with the rotation direction of the handle 27, and the rotary presser 22 is rotated. Rotates the main body frame 21 along the pipe end of the pipe P. Accordingly, the rotary helical blade 231 is moved by the large-diameter gear 241 and the small-diameter gear 242 to the main rotary shaft 21.
It rotates more than one rotation speed. That is, the cutting blade 2311 rotates while rotating around the outer peripheral surface of the pipe P, and scrapes the outer surface of the pipe end at a predetermined cutting margin.

When the shaving of the outer surface of the tube end is completed, the clearance adjusting screw 26 is loosened to remove the rotary holder 22 and the main body holder 21 is removed from the tube end to complete the operation.

[0039]

As described above, the present inventions 1 and 2
When scraping the outer surface of the end of a synthetic resin pipe made of polyethylene or the like, the scraper for a synthetic pressure resin pipe of any of the above forms a constant scraping allowance even if the pipe is slightly deformed, and the scraper rotates once. Thus, the pipe surface of a predetermined length can be scraped off, and the state can be visually observed.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional side view of a scraper for a synthetic resin pipe of Invention 1. FIG.

FIG. 2 is a partial cross-sectional view of an example of the cylindrical presser of the first invention. (A) shows a state where the diameter of the holding tool is expanded,
(B) shows a state where the diameter of the holding tool is reduced.

FIG. 3 is a side view of a scraper for a synthetic resin pipe of Invention 2.

FIG. 4 shows a case where there are two rotary retainers in FIG.
It is explanatory drawing which shows the positional relationship of the rotating shaft of a rotary holding tool and the rotating shaft of a rotary helical blade.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Main body frame of invention 1 111 Main rotating shaft 112 Groove 12 Cylindrical holding tool 121 Holding tool center axis 13 Rotating spiral blade holder 131 Rotating spiral blade 1311 Cutting blade cutting point 14 Transmission 141 Large diameter gear 142 Small diameter gear 143 Planetary gear 15 Clearance Adjusting screw 16 Handle 21 Main body frame 211 of invention 2 211 Main rotating shaft 212 Groove 22 Rotating holding tool 221 Rotating shaft 222 Holding tool holder 23 Rotating helical blade holder 231 Rotating helical blade 2311 Cutting blade cutting end 24 Transmission 241 Large diameter gear 242 Small diameter gear Reference Signs List 25 power transmission device 251 primary pulley 252 secondary pulley 253 tension pulley 26 clearance adjustment screw 27 handle P synthetic resin pipe

Claims (2)

[Claims] 1. A rotary helical blade in which a cylindrical body provided with a plurality of helical cutting blades on an outer peripheral surface is rotated around a central axis in a circumferential direction in a direction in which a cutting edge of the cutting blade faces, and a pipe end. A cylindrical presser which can be pressed against the inner surface of the synthetic resin pipe whose outer peripheral surface is removed, and a gap which makes the distance between the cutting edge of the rotary spiral blade and the outer peripheral surface of the presser variable Connecting the adjusting screw, a main rotating shaft having a center axis that is on an extension of the center axis of the cylindrical holding member and separated from the center axis, and a rotating shaft of the rotary helical blade and the main rotating shaft; A transmission, and a handle for rotating the main rotary shaft. The rotary shaft of the rotary spiral blade and the main rotary shaft are parallel to each other and connected by the transmission, and the rotational speed of the rotary spiral blade is the main rotary shaft. Rotation speed The cutting edge of the spiral blade is cut into the outer surface of the synthetic resin pipe by a predetermined cutting allowance, and when the main rotating shaft is rotated by turning the handle, the rotary spiral blade rotates and the outer peripheral surface of the end of the synthetic resin pipe. A scraper for a synthetic resin pipe, wherein the scraper orbits the outer peripheral surface of the synthetic resin pipe while eliminating the above. 2. A rotary helical blade in which a cylindrical body provided with a plurality of helical cutting blades on an outer peripheral surface is rotated around a central axis in a circumferential direction in a direction in which a cutting edge of the cutting blade faces, and a cylindrical shape. A rotary presser, a gap adjusting screw for varying the distance between the cutting edge of the rotary helical blade and the outer peripheral surface of the cylindrical rotary presser, and a rotary presser on the central axis of the cylindrical rotary presser. A main rotating shaft to be rotated, a transmission for connecting the main rotating shaft and the rotating shaft of the rotating spiral blade, and a handle for rotating the main rotating shaft, the rotating shaft of the rotating spiral blade and the main rotating shaft, Are parallel and connected by a transmission so that the rotational speed of the rotary spiral blade is greater than the rotational speed of the main rotary shaft, and the cutting end of the rotary spiral blade and the outer peripheral surface of the holding member are outside the pipe end. The surface of the synthetic resin tube whose surface is removed The end of the rotary helical blade is cut into the outer surface of the synthetic resin pipe by a predetermined cutting allowance, holding the pipe end tube wall, and turning the handle to rotate the main rotary shaft causes the cylindrical rotary presser to rotate. It is characterized in that it rotates around the inner peripheral surface of the synthetic resin pipe, and at the same time, the rotary helical blade rotates and removes the outer peripheral surface at the end of the synthetic resin pipe, and the whole goes around the pipe wall of the synthetic resin pipe. For a synthetic resin pipe.