JP2014087864A - Resin pipe scraper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin pipe scraper which can cut an end surface of a resin pipe.SOLUTION: A resin pipe scraper comprises: a resin pipe holding part holding an outer cylindrical surface or an inner cylindrical surface of a resin pipe; a body part having a flat surface which is provided vertically relative to the resin pipe holding part; a blade which is provided at the body part and cuts an end surface of the resin pipe; and a cut powder discharge hole which is provided at the body part so as to be adjacent to the blade and discharges cut powders which are generated by cutting the end surface of the resin pipe. The resin pipe is inserted from one end side and held in the resin pipe holding part, and the scraper is rotated in a state that the end surface of the resin pipe is pressed against the blade whereby the end surface of the resin pipe is cut.

Description

  The present invention relates to a resin pipe scraper for cutting an end face of a pipe end portion so as to be easily fused before fusing a resin pipe made of polyethylene, polypropylene, or the like to a resin pipe joint.

  Resin pipes are used as piping materials for gas and water and sewage. Such a resin pipe has characteristics such as being not corroded, resistant to ground fluctuations such as an earthquake, lightweight and easy to work on pipes, etc., when compared with conventional metal pipes such as cast iron pipes and steel pipes.

  In particular, if EF (electrofusion) joining is performed by heating and fusing a resin pipe and a resin pipe joint with a heating wire, the resin pipe and the resin pipe joint are integrated, and the resin pipe can be attached even if an external force such as tension or bending is applied. It does not fall off from the resin pipe joint. A schematic diagram of EF bonding is shown in FIG. After arranging the first resin pipe 91, the second resin pipe 92 and the resin pipe joint 93 as shown in FIG. 6A, when energizing the heating wire 94 installed on the inner peripheral surface of the resin pipe joint 93, Due to heat generated by the heating wire 94, the inner peripheral surface of the resin pipe joint 93 and the outer peripheral surfaces of the first resin pipe 91 and the second resin pipe 92 are melted and fused. Thus, the first resin pipe 91, the second resin pipe 92, and the resin pipe joint 93 are integrated.

  By the way, before performing EF joining, a resin pipe having a predetermined length to be inserted into the resin pipe joint must be prepared, and the resin pipe needs to be cut into a predetermined length in advance. As a method of cutting the resin pipe, conventionally, the cutting was performed with a wheel cutter, but in recent years, the use of convenient manual scissors (PE pipe cutter) is increasing. In this case, the cut end surface of the resin tube is not perpendicular to the axis of the resin tube but is inclined, and the flatness of the cut end surface is likely to be greatly deviated from the required accuracy. As shown in FIG. 6 (b), when the resin pipe cut obliquely is EF-bonded, when the heating wire 94 is energized, the resin is formed in the enlarged gap between the first resin pipe and the second resin pipe. The inner peripheral surface of the pipe joint 93 may melt and the heating wire may hang down and short-circuit. This short circuit causes poor fusion. This poor fusion is not limited to gas leakage and water leakage, and may cause pipe dropout during an earthquake.

  Therefore, it is necessary to scrape the end surface of the resin tube and make the end surface perpendicular to the axis of the resin tube. A device for performing the work of cutting the end face of the resin pipe is described in Patent Document 1, but it is a large-scale apparatus and is difficult to use on the piping site. On the other hand, Patent Document 2 proposes a scraper for a resin tube as a device for performing scraping on the outer periphery of the resin tube and deburring of the end surface (for example, 45 ° chamfering). However, the invention described in Patent Document 2 is not recognized as a subject of the present invention and is different from the present invention.

JP 2000-158386 A JP-A-11-351484

  An object of the present invention is to provide a resin pipe scraper capable of performing an operation (scraping) of cutting an end surface of a resin pipe prior to fusion between a resin pipe and a resin pipe joint.

According to the invention described in claim 1, the scraper (100, 200)
A cylindrical holder (3, 9, 3X, 3Y) for holding the resin pipe (20, 30);
The flat surface (2a) is perpendicular to the axis (Z) of the cylindrical holding portion (3, 9, 3X, 3Y) and has a flat surface (2a) with which the end surface of the resin pipe (20, 30) abuts. The main body (2, 2X),
A blade (1, 1X, 1Y) installed on the main body (2, 2X) and cutting the end face of the resin pipe (20, 30);
Chip discharge holes (2c, 2Xc, 2Yc) for discharging chips generated by cutting the end face, and positions adjacent to the blades (1, 1X, 1Y) of the main body (2, 2X) Chip discharge holes (2c, 2Xc, 2Yc) provided in
It is characterized by providing.

  The cylindrical holding portion makes it possible to hold the resin tube stably, and is a flat surface perpendicular to the axis of the cylindrical holding portion, and by the cooperative action with the flat surface against which the end surface of the resin tube abuts, the resin tube Cutting can be performed so that the end face of the tube is perpendicular to the axis. In addition, the chip discharge hole prevents clogging between the resin pipe end surface and the blade or the main body, and prevents the cutting operation from being interrupted, thereby ensuring the processing accuracy of the resin pipe end surface. .

It is a disassembled perspective view of the scraper of 1st Embodiment of this invention. It is a three-plane figure of the scraper of FIG. 1, (b) is front sectional drawing cut | disconnected in the cutting line AA of (a), (a) is a left view, (c) is a right view. It is a figure showing the blade of the scraper of FIG. 1, (a) is a front view, (b) is a side view. It is a principle diagram of the end surface cutting of the resin pipe by the scraper of FIG. It is a three-plane figure of the scraper of 2nd Embodiment of this invention, (b) is front sectional drawing cut | disconnected in the cutting line BB of (a), (a) is a left view, (c) is a right side FIG. (A) is a figure showing the principle of EF joining, (b) is a figure when carrying out EF joining of the resin pipe cut | disconnected diagonally.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
1-4 is a figure for demonstrating the scraper 100 of 1st Embodiment of this invention. As shown in FIG. 2, the scraper 100 can cut end surfaces of two types of resin tubes. That is, the scraper 100 can cut the end surfaces 20a and 30a of the first resin pipe 20 indicated by the phantom line and the second resin pipe 30 indicated by the phantom line.

  The scraper 100 includes a blade 1, a main body 2, and a sleeve 3. The blade 1 is fastened to the main body 2 by two screws 5 via a height adjusting shim 6, and the sleeve 3 is fastened to the main body 2 by three screws 4. The blade 1 is made of, for example, stainless steel, and the main body 2 and the sleeve 3 are made of, for example, aluminum. One end of the sleeve 3 is open and the other end is closed by the main body 2. The inner diameter of the inner cylindrical surface 3a of the sleeve 3 is slightly larger than the outer diameter of the first resin tube 20, and the inner cylindrical surface 3a of the sleeve 3 extends straight along the axis Z of the inner cylindrical surface 3a. Yes. With this structure, the first resin tube 20 can be inserted from one end side of the scraper 100, and the outer cylindrical surface 20 b of the first resin tube 20 can be stably held on the inner cylindrical surface 3 a of the sleeve 3.

  The main body 2 includes a second resin tube holding portion 9 that holds the inner cylindrical surface 30 b of the second resin tube 30. The outer diameter of the outer cylindrical surface 9a of the second resin tube holding portion 9 is slightly smaller than the inner diameter of the inner cylindrical surface 30b of the second resin tube 30, and the outer cylindrical surface 9a of the second resin tube holding portion 9 is It extends straight along the axis Z of the outer cylindrical surface 9a. With this structure, the second resin tube 30 is inserted from one end side of the scraper 100, and the inner cylindrical surface 30b of the second resin tube 30 is stably held on the outer cylindrical surface 9a of the second resin tube holding portion 9. Can do. As shown in FIG. 1, the cylindrical portion of the second resin tube holding portion 9 has a shape in which a part thereof is missing in order to arrange the blade 1. The inner cylindrical surface 3a of the sleeve 3 and the outer cylindrical surface 9a of the second resin tube holding part 9 share the axis Z and are formed coaxially.

  The main body 2 has a flat surface 2 a provided perpendicular to the axis Z of the inner cylindrical surface 3 a of the sleeve 3 and the outer cylindrical surface 9 a of the second resin tube holding portion 9. The end surfaces 20a and 30a of the resin tubes 20 and 30 are in contact with the plane 2a. The blade 1 is fixed in a groove 2b formed so as to be recessed from the plane 2a. As shown in FIG. 3, the blade 1 is generally formed in a flat plate, and has a cutting edge portion 1a, a mounting surface 1b, an upper surface (rake surface) 1c, and two fastening screw holes 1d. The cutting edge angle α is, for example, 30 °. The upper surface 1c is inclined with respect to the mounting surface 1b by an angle θ so that the cutting edge portion 1a protrudes to the resin tube cutting side, that is, the left side in FIG. Due to the existence of this inclination angle θ, only the vicinity of the cutting edge portion 1a of the blade 1 abuts on the end surface of the resin tube, and the other part of the blade 1 does not abut on the end surface of the resin tube.

  As shown in FIG. 2 (b), the blade 1 is fixed to the main body 2 via the height adjusting shim 6 so that the cutting edge portion 1a protrudes 0.2mm (h portion) from the flat surface 2a toward the end surface side of the resin tube. Is done. The end face of the resin pipe can be cut by this 0.2 mm protrusion. Further, a chip discharge hole 2 c for discharging chips generated when cutting the end surface of the resin tube is provided in the main body 2 adjacent to the blade 1. By the chip discharge hole 2c, it is possible to prevent chips from clogging between the end face of the resin tube and the blade or the main body, thereby obstructing the cutting operation, and it is possible to ensure the processing accuracy of the end face of the resin pipe.

  In the first embodiment, the main body 2 and the sleeve 3 have been described as separate bodies, but it is of course possible to integrate them. Moreover, although the 2nd resin pipe holding | maintenance part 9 was demonstrated as what was integrated with the main body 2, of course, it is also possible to separate.

(Method of operation)
Next, the operation method of the scraper 100 of 1st Embodiment is demonstrated. As shown in FIG. 4, for example, the scraper 100 is held with the right hand, the first resin pipe 20 is inserted from one end side of the scraper 100 with the left hand, for example, and the outer cylindrical surface 20 b of the first resin pipe 20 is connected to the inner cylinder of the sleeve 3. The first resin tube 20 is held in a stationary state without being rotated. With the end surface 20a of the first resin tube 20 pressed against the blade 1, the scraper 100 is rotated with the right hand to cut the end surface 20a of the first resin tube 20. At this time, a considerable portion of the end faces 20a, 30a of the resin tubes 20, 30 is in contact with the flat surface 2a. The rotation direction of the scraper 100 is clockwise as shown in FIG. At the time of cutting, a “chipless” shaped chip having a thickness of 0.2 mm is generated (see FIG. 4). If the scraper 100 is rotated for a predetermined time, the end surface 20a of the first resin tube 20 becomes an end surface that is perpendicular to the tube axis and has high flatness.

  The same applies to the second resin pipe 30. The second resin tube 30 is inserted from one end side of the scraper 100, the inner cylindrical surface 30b of the second resin tube 30 is held by the outer cylindrical surface 9a of the second resin tube holding portion 9, and the end surface 30a of the second resin tube 30 is retained. The scraper 100 is rotated while pressing the blade 1 against the blade 1 to cut the end face 30a of the second resin tube 30.

  Needless to say, the above-described rotating operation of the scraper 100 can be performed manually or by an electric motor or other mechanical means.

(Second Embodiment)
Next, the scraper 200 of 2nd Embodiment of this invention is demonstrated, referring FIG. The scraper 200 has a first resin tube holding portion 3X and a first blade 1X on one end side, and a second resin tube holding portion 3Y and a second blade 1Y on the other end side. Then, the first resin pipe 20 is inserted from one end side of the scraper 200 and held by the inner cylindrical surface 3Xa of the first resin pipe holding portion 3X, and the end face of the first resin pipe 20 is pressed against the first blade 1X. The scraper 200 can be rotated to cut the end surface of the first resin tube 20. Also, the second resin tube 30 is inserted from the other end side of the scraper 200 and held by the inner cylindrical surface 3Ya of the second resin tube holding portion 3Y, and the end surface of the second resin tube 30 is pressed against the second blade 1Y. Thus, the scraper 200 can be rotated to cut the end surface of the second resin tube 30.

  Since other detailed matters are the same as those in the first embodiment, description thereof will be omitted.

  As described above, it is possible to provide a resin tube scraper that can perform an operation (scraping) of the end surface of the resin tube prior to fusion between the resin tube and the resin tube joint.

DESCRIPTION OF SYMBOLS 100 Scraper of 1st Embodiment 200 Scraper of 2nd Embodiment 1 Blade 2 Main body 2c Chip discharge hole 3 Sleeve (1st resin pipe holding part)
4 Screw 5 Screw 9 Second resin tube holding portion 20 First resin tube 30 Second resin tube

Claims (6)

A cylindrical holder (3, 9, 3X, 3Y) for holding the resin pipe (20, 30);
The flat surface (2a) is perpendicular to the axis (Z) of the cylindrical holding portion (3, 9, 3X, 3Y) and has a flat surface (2a) with which the end surface of the resin pipe (20, 30) abuts. The main body (2, 2X),
A blade (1, 1X, 1Y) installed on the main body (2, 2X) to cut the end face of the resin pipe (20, 30);
Chip discharge holes (2c, 2Xc, 2Yc) for discharging chips generated by cutting the end face, and positions adjacent to the blades (1, 1X, 1Y) of the main body (2, 2X) Chip discharge holes (2c, 2Xc, 2Yc) provided in
A scraper (100, 200) comprising: The resin pipe (20, 30) includes a first resin pipe (20) and a second resin pipe (30),
The cylindrical holding part (3, 9, 3X, 3Y) has a first holding part (3, 3X) for holding the first resin pipe (20) and a second holding for holding the second resin pipe (30). The scraper (100, 200) according to claim 1, characterized in that it comprises a portion (9, 3Y). The first holding part (3) holds the outer cylindrical surface of the first resin pipe (20),
The scraper (100) according to claim 2, wherein the second holding part (9) holds the inner cylindrical surface of the second resin pipe (30). The first holding part (3) holds the outer cylindrical surface of the first resin pipe (20),
The scraper (200) according to claim 2, wherein the second holding part (9) holds the outer cylindrical surface of the second resin pipe (30).   The scraper (100) according to any one of claims 1 to 4, wherein the resin tube holding portion (3, 9, 3X, 3Y) and the main body portion (2, 2X) are integrated. , 200).   The scraper (100, 200) according to any one of claims 1 to 5, wherein the scraper (100, 200) can be rotated by hand.

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