JP2003211301A - Pipe outer peripheral surface scraper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe outer peripheral surface scraper capable of preventing from a scraper coming out from a pipe end portion. <P>SOLUTION: This scraper 1 has a supporting means 30 supporting a turning tool sending mechanism 10 for sending a cutting tool 11 in a circumferential direction and in an axial direction along a pipe outer peripheral surface P2 at a pipe end portion P1 so as to move in a rotating direction. The supporting means 30 has outer surface rollers 31, 32 pressed against the pipe outer peripheral surface P2, and inner peripheral surface rollers 35, 36 pressed against a pipe inner peripheral surface P3. The diameter of the inner surface roller 35 in the pipe end surface side is larger than the diameter of the inner surface roller 36 in the opposite end surface side. Therefore, the rotating peripheral speed of the inner surface roller 35 comes to be faster than the rotating peripheral speed of the inner surface roller 36. Force turning the whole scraper toward the opposite end portion side of the pipe is generated, thereby preventing the scraper from coming out. <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 scraper for peeling the outer periphery of polyethylene pipes and the like near the end faces. In particular, the present invention relates to a pipe outer peripheral surface scraper improved so that the scraper does not come out from the end of the pipe.

[0002]

2. Description of the Related Art In recent years, polyethylene pipes have been widely used for city gas pipes. Polyethylene pipes are more resistant to corrosion and earthquakes than conventional plated steel pipes,
This is because the workability of piping work is also excellent. As a method of connecting the polyethylene pipes, a method of fusion-bonding the outer peripheral surface of the end portion of the pipe and the inner surface of the joint by using an electrofusion (electrofusion) joint (EF joint) is generally used. . When joining EF joints, in order to secure the quality (airtightness, strength, etc.) of the joints by removing the surface-altered layer at the fusion-bonded portion, the outer peripheral surface near the end of the pipe to be connected is a pre-process (Several 10 cm from the edge) is processed by peeling (scraper).

A scraper is known as a tool for stripping the outer peripheral surface of a pipe. The scraper has a peeling bite that is pressed against the outer peripheral surface of the pipe, and means for sending the bite to the pipe in the circumferential direction and the axial direction. Generally, in the circumferential direction of the pipe, an operator manually turns the scraper to move the bite. In the axial direction, the blade mechanism feeds the blade at a pitch synchronized with the rotation of the scraper by a screw mechanism.

An example of such a scraper is disclosed in Japanese Patent No. 3165382. FIG. 6 is a side view showing the entire structure of the scraper disclosed in Japanese Patent No. 3165382. FIG. 7 is a front view of the scraper of FIG. The scraper 100 shown in these figures is attached to the end surface P1 of a polyethylene pipe P, and its outer peripheral surface P2.
Peel off the skin.

The scraper 100 has a main body 101. An outer peripheral roller shaft 112 is attached to the main body 101 so as to project to the left side (pipe P axial direction) in FIG. 6. As shown in FIG. 7, two peripheral roller shafts 112 are provided on both sides of the main body 101 (both left and right sides in FIG. 7). At both ends of each outer peripheral roller shaft 112, the outer surface roller 105 (pipe end side), 10
6 (opposite end of the pipe) is rotatably fitted to the shaft 112. These outer rollers 105, 106
Are provided so as to be separated from each other in the pipe axial direction and the circumferential direction.

An arm 115 is rotatably attached to the lower end of the body 101 in the drawing. Arm 11
A base 111 is rotatably attached to the tip of the unit 5. Inner rollers 107 are independently rotatably attached to the four corners of the base 111, respectively.
The base 111 having these inner surface rollers 107 swings up and down in the pipe P via the arm 115.
The rotation angle of the arm 115 and the base 111 is the knob 118.
It can be adjusted by the operation of. These outer peripheral roller shaft 112, outer surface rollers 105 and 106, inner surface roller 1
07, the base 111, the arm 115, the knob 118, and the like constitute a support means that supports the main body 101 at the end of the pipe so as to be movable in the rotational direction.

The scraper 100 comprises a lock screw 121 rotatably provided with respect to the main body 101, and a rotary grip 125 for rotating the lock screw 121 and the main body 101. Furthermore, the scraper 100 is
A feed screw shaft 127 is provided. The feed screw shaft 127 is a peripheral screw 12 that is screwed with the lock screw 121.
3 has a main body 101 according to the rotation of the lock screw 121.
Is pulled out and pulled in along the pipe axis. At the tip of the feed screw shaft 127, a peeling bite (scraper tip 13 that is pressed against the outer peripheral surface P2 of the pipe).
The tool holder unit 130 having 1) is attached. Pipe the scraper 100 as shown
When the rotating grip 125 is gripped by hand and turned in the direction of the arrow in FIG.
Peel while rotating the circumference.

[0008]

In the above-mentioned scraper 100, each of the outer peripheral rollers 105, 106 and each of the inner peripheral rollers 107 are provided four by four apart from each other in the axial direction and the circumferential direction of the pipe P. Outer roller 10
5 has a fixed position with respect to the main body 101, and the inner peripheral roller 107 can swing up and down via a base 111 and an arm 115. At the time of peeling the pipe P, the inner peripheral rollers 10 located on the left and right sides of FIG.
It is desirable that the axes of 7A and 107B always maintain parallelism. At this time, the inner peripheral surface of the pipe P is accurately brought into contact with the outer peripheral surface of each inner peripheral roller, and the scraper 100
The rotation of the pipe P in the circumferential direction becomes smooth.

However, it is difficult to keep the axes of the inner peripheral rollers parallel to each other due to variations in the machining tolerance of the tool. Therefore, the scraper 100 may tend to come out from the end of the pipe P during the work. Further, when the worker pulls and holds the scraper 100, the scraper 100 may come out of the pipe P.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a pipe outer peripheral surface scraper capable of preventing the scraper from coming out from the end of the pipe.

[0011]

In order to solve the above-mentioned problems, the pipe outer peripheral surface scraper of the present invention is a scraper for peeling off the skin of the pipe outer peripheral surface in the vicinity of the end surface of the pipe, which is pressed against the outer peripheral surface of the pipe. A peeling bite, a bite feeding mechanism that feeds the bite circumferentially and axially along the pipe outer peripheral surface, a holding mechanism that holds the bite feeding mechanism on the pipe outer peripheral surface, and the bite feeding mechanism and the holding mechanism. Supporting means for movably supporting the pipe end portion in a rotational direction, the supporting means comprising a plurality of outer surface rollers pressed against the outer peripheral surface of the pipe and a plurality of outer surface rollers pressed against the inner peripheral surface of the pipe. An inner surface roller of, and an outer surface roller and / or
Alternatively, the inner surface roller has a pair of rollers arranged on the end surface side and the opposite end surface side of the pipe and rotating along the circumferential direction of the pipe peripheral surface, and the pair of rollers rotate in phase. Are connected to form
The diameter of the roller on the end face side is larger than the diameter of the roller on the opposite end face side.

When the scraper is attached to the end of the pipe and rotated along the pipe circumferential direction, the roller on the end face side of the pipe (roller having a larger diameter) rotates at a rotational peripheral speed on the side opposite to the pipe (roller having a smaller diameter). ) Is faster than the peripheral speed of rotation, the momentum is generated such that the entire scraper tries to wrap around toward the other end of the pipe. Therefore, the scraper can be naturally prevented from coming out. For this reason,
The demand for strict machining accuracy for each scraper component is also eased. In addition, such a roller can be used for either or both of an outer surface roller and an inner surface roller.

In the present invention, the supporting means includes an arm rotatably attached to the scraper body,
A rod rotatably attached to the tip of the arm, wherein the pair of rollers are attached to the end face side and the opposite end face side of the rod so as to rotate integrally with the rod. can do.

[0014]

DETAILED DESCRIPTION OF THE INVENTION A description will be given below with reference to the drawings. FIG. 1 is a view schematically showing a state in which a pipe outer peripheral surface scraper according to the present invention is attached to a pipe. Figure 2
FIG. 1 is a side view showing an overall structure of a pipe outer peripheral surface scraper according to an embodiment of the present invention. FIG. 3 is a front view of the pipe outer peripheral surface scraper of FIG. FIG. 4 is a plan view showing the pedestal, shaft, and inner surface roller of the pipe outer peripheral surface scraper of FIG. FIG. 5 is a sectional view taken along line XX of FIG.

First, an outline of the entire pipe outer peripheral surface scraper 1 of this embodiment will be described. As schematically shown in FIG. 1, the scraper 1 of the present embodiment is a device that is attached to an end surface P1 of a polyethylene pipe P and strips the outer skin of the pipe outer peripheral surface P2. The scraper 1 is roughly divided into the following parts. (1) Scraper body 2. The main body 2 is arranged on the end side of the pipe P in the attached state.

(2) The cutting tool 11 and the cutting tool feed mechanism 10 for sending the cutting tool 11 in the circumferential direction and the axial direction along the pipe outer peripheral surface P2 (details of the cutting tool feed mechanism 10 are omitted in FIG. 1). This bite feed mechanism 10 is a main body 2
From the main body cylinder 21 fixed to the
It has a lead screw shaft 13 that is retracted. The feed screw shaft 13 is extended and retracted by operating the rotary grip 15. A holder unit 19 having a bite 11 attached to the tip of the feed screw shaft 13.
Is attached. At the same time that the bite 11 is rotated by the bite feed mechanism 10, the bite 11 is fed from the left to the right in FIG. 2 to strip the outer peripheral surface P2 of the pipe.

(3) The bite feed mechanism 10 is attached to the pipe end P.
1. A support means 30 that supports the unit 1 so as to be movable in the rotational direction. The support means 30 includes outer surface rollers 31, 32 and an outer roller shaft 33 provided on the upper portion of the main body 2, and inner surface rollers 35, 36, an inner roller shaft 41, an arm 43, a knob 45, etc. provided on the lower portion of the main body 2. Prepare Outer rollers 31, 3
2 is fixed in position with respect to the main body 2, while the inner surface rollers 35 and 36 are the inner roller shaft 41 and the arm 4.
Swing up and down through 3. Hold the grip 15 shown in FIGS. 1 and 2 by hand and pipe the entire scraper 1 to the pipe P.
When pushed in the circumferential direction, the scraper 1 as a whole rotates around the circumference of the pipe P. The inner rollers 35, 36 in this embodiment are the most characteristic parts of the scraper according to the present invention. In FIG. 1, the inner surface roller 35 having a large diameter on the pipe end side is exaggeratedly shown in a large size.

Next, each section will be described in more detail. The left / right / upper / lower directions in the description refer to the left / right / up / down in FIGS. 1 and 2. First, the main body 2 will be described. The body 2 is, for example, made of cast aluminum alloy. As shown in FIG. 2, the end of the main body cylinder 21 of the tool feeding mechanism 10 is fitted to the upper right side of the main body 2 via the bush 5 and the like. The end of the main body cylinder 21 is fixed to the main body 2 with a machine screw 8. As shown in FIGS. 2 and 3, the ends of the two guide rods 16 and the ends of the two outer roller shafts 33 that support the outer surface rollers 31 and 32 are fixed to the upper left side of the main body 2. ing. As shown in FIG. 2, a rib 4 for reinforcing the right end portion of the outer roller shaft 33 is formed on the upper portion of the main body 2. On the other hand, in the lower part of the main body 2, as shown in FIG. 3, a pair of legs 6 that hang down like a frog are formed. Between these legs 6 is an arm 4
3 and the knob 45 are attached.

Next, the structure around the cutting tool 11 will be described. As shown in FIGS. 2 and 3, the cutting tool 11 is a replaceable cutting tip made of cemented carbide. This byte 11
Are attached to the lower end of the holder unit 19 so as to project. Byte 11 is holder unit 19
It is biased downward by a spring (not shown) inside. As shown in FIG. 2, the holder unit 19 is connected and fixed to the tip of the feed screw shaft 13. While being guided by the guide rod 16, the holder unit 19 is driven left and right in accordance with the feeding operation of the feed screw shaft 13.

Next, the bite feeding mechanism 10 will be described. As shown in FIG. 2, the feed screw shaft 13 connected to the bite holder unit 19 has a feed screw 1 on the outer surface.
3a is cut. The bite holder unit 19
It is guided by the guide rod 16 (the guide rod on the right side in FIG. 3), and the posture in the pipe circumferential direction with respect to the main body 2 does not change. Therefore, the feed screw shaft 13 fixed to the bite holder unit 19 is
It does not rotate relative to.

On the other hand, the feed screw shaft 13 is slidable with respect to the main body 2 in the pipe axial direction. That is, the feed screw shaft 13 is a rotating lock screw (female screw).
Driven by 24, it can slide left and right inside the main body cylinder 21. As shown in FIG. 2, a hole 13b is formed in the axial center of the feed screw shaft 13 from the left end surface. This hole 13
The guide rod 16 (the right guide rod in FIG. 3) is slidably inserted in b. Therefore, the feed screw shaft 13 is also guided by the guide rod 16.

The main body cylinder 21 is a hollow shaft having a slightly complicated shape. As shown in FIG. 2, a hole 22 is formed in the leftward portion of the main body cylinder 21, and a lock screw 24 is swingably accommodated in the hole 22. Lock screw 24
Is swingable up and down around the spring pin 25. The lock screw 24 is biased by a spring 26 in a clockwise direction (a screwing direction of the feed screw shaft 13 and the feed screw 13a). As described above, the feed screw shaft 13 is slidably fitted into the left hollow hole 21a inside the main body cylinder 21.

A grip 1 is provided on the outer periphery of the central portion of the main body cylinder 21.
5 is fitted. The grip 15 is fixed so as not to move with respect to the main body cylinder 21. The right-side hollow hole 21b of the main body cylinder 21 is wider than the left-side hollow hole 21a, and escapes from the outer circumference of the feed screw shaft 13. The right end of the right inner hole is covered with a poly stopper 14.
The grip 15 is a cylindrical member made of plastic.

As shown in FIGS. 1 and 2, the grip 15
An uneven surface 15a for gripping is formed on the upper surface of the so that it can be easily gripped manually. A recess 15b is formed on the left side of the unevenness 15a of the grip 15. This recess 15
The head of the urea screw 12 is accommodated in b. Recess 1
A slit (oblong hole) 15c is formed in the bottom of the 5b, and the threaded portion of the urea screw 12 and the winding bush on the outer surface thereof penetrate the slit 15c up and down. When the user pushes the head of the urea screw 12 with the finger to the left, the winding bush moves to the left in the slit 15c. At this time, the lock spring 26 is compressed, and the lock screw 24 tilts around the pin 25 and counterclockwise in FIG. The rotation of the grip 15 about the axis is performed through the slit 15c and the urea screw 12,
It is transmitted to the lock screw 24. When the grip 15 is turned, the lock screw 24 is also turned, so that the lock screw 2
The feed screw shaft 13 screwed with the screw 4 can be fed to the left and right (extended and retracted).

When the lock screw 24 is in a horizontal posture (usually in this posture by the bias of the spring 26), the feed screw shaft 13 is screwed with the lock screw 24. When the lock screw 24 is rotated around the spring pin 25 by pushing the head of the urea screw 12 to the left, the screwing of these two (the screwing of the female screw of the lock screw 24 and the feed screw 13a of the feed screw shaft 13) is released, and the feed screw is released. Shaft 13
Can slide in the lock screw 24. Then, the feed screw shaft 13 can freely slide left and right in the main body cylinder 21, and the bite holder unit 19 connected and fixed to the left end of the feed screw shaft 13 can freely slide left and right. it can.

This means that the left and right positions of the cutting tool 11 can be changed in a one-touch sliding manner without turning the grip 15 one by one. Especially, after the skin removing work (sending the cutting tool from left to right) is completed, At the time of returning the bite when moving to the work (returning from the right to the left empty (without cutting)), it is possible to return the bite in a one-touch slide system without turning the grip 15, which makes the work extremely easy.

Next, the supporting means 30 having the inner rollers 35 and 36, which is a characteristic part of the present invention, will be described in detail. The outer rollers 31 (pipe end side; right side in FIGS. 1 and 2) and 32 (pipe opposite end side; left side in FIGS. 1 and 2) of the supporting means 30 are both end portions of two outer roller shafts 33. It is rotatably fitted in and is provided in total of four. As shown in FIGS. 2 and 3, two outer roller shafts 33 are attached so as to project in the axial direction of the pipe P. The fitting portion between each outer roller shaft 33 and the main body 2 is reinforced by the ribs 4 of the main body 2 so that the outer roller shaft 33 does not shake. The two outer roller shafts 33 and the two guide rods 16 have their tips (left ends) fixed to each other by a positioning plate 34 to enhance rigidity. The outer peripheral surface of each outer surface roller 31, 32 is knurled to prevent slippage with respect to the pipe outer peripheral surface P2. The outer surface roller 31 on the pipe end side is regulated by entering the groove of the main body 2 in the thrust direction, and the outer surface roller 32 on the pipe opposite end side is regulated in the thrust direction by the flat washer 39 and the positioning plate 34. There is.

As shown most clearly in FIG. 4, inner surface rollers 35 (pipe end side; right side in FIGS. 1 and 2), 3
6 (opposite end of pipe; left side of FIGS. 1 and 2) is fixed to both ends of two inner roller shafts 41. Four inner surface rollers 35 and 36 are provided in total, and the diameter of the roller 35 on the pipe end side is larger than the diameter of the roller 36 on the pipe opposite end side. FIG. 1 is a schematic view showing this in a slightly exaggerated manner. The diameter of the roller 35 on the pipe end side is 23 mm in one example, and the diameter of the roller 36 on the other end side of the pipe is 22 mm in one example.

The two inner roller shafts 41 are connected by a pedestal 47. As shown in FIG. 5, a bearing 48 is interposed at a connecting portion between each inner roller shaft 41 and the pedestal 47. The inner surface rollers 35, 36 and the inner roller shaft 41 are integrally assembled, and the inner surface rollers 35, 36 rotate together with the inner roller shaft 41 with respect to the pedestal 47. The inner roller shaft 41 is formed with two grooves 41a extending in the circumferential direction. Pressing plates 49 on both side surfaces of the pedestal 47 are inserted in the respective grooves 41a. As a result, the inner roller shaft 41 is regulated so as not to move in the axial direction.

As shown in FIGS. 4 and 2, a block 51 projecting downward is formed at the center of the bottom surface of the pedestal 47. As shown in FIG. 2, the block 51 is connected to the tip (left end) 43a of the arm 43. The block 51 and the tip 43a of the arm 43 are connected to the spring pin 52.
Is rotatably connected (angle 5 to 30 °).

As shown in FIGS. 1 and 2, the arm 43 is a rod-shaped member. As described above, the left end 43a of the arm 43 is attached to the block 51 of the pedestal 47 by the spring pin 52.
Is rotatably connected via. A rib 43b for connecting to the tip joint 55 of the knob 45 is provided below the center of the arm 43. This rib 43b and knob 4
The tip joint 55 of No. 5 is rotatably connected via a spring pin 66. Further, the right end 43c of the arm 43 is connected to the main body 2 via the spring pin 54. The entire arm 43 is rotatable with respect to the main body 2.

The knob 45 is arranged such that the middle of the male screw portion 61 is screwed into the nut 63. A joint 55 is fixed to the tip of the knob 45 with a machine screw 67. As described above, this joint 55 is connected to the rib 43b of the arm 43 via the spring pin 66. Here, both the joint 55 and the nut 63 are rotatable. By turning this knob 45, the degree of advance of the male screw portion 61 with respect to the nut 63 is changed, the rotation angle of the arm 43 with respect to the main body 2 is adjusted, and finally, the inner surface roller 35 attached to the inner roller shaft 41, Three
The pressing force of 6 on the inner surface of the pipe P can be adjusted.

Next, the operation of the scraper of this embodiment will be described collectively. (1) Grasp the grip 15 with your hand and push the urea screw 12 to the left with your finger to tilt the lock screw 24 counterclockwise, and then the female screw of the lock screw 24 and the feed screw 1 of the feed screw shaft 13
Unscrew with 3a.

(2) As it is, the bite holder unit 19 is pinched by the finger of one hand, and the feed screw shaft 13 is slid to the right and left position (cutting start position) of the holder unit 19. The guide rod 16
Is marked with a mark (not shown), and if the left end face of the holder unit 19 is aligned with the mark or the face of the positioning plate 34 in accordance with the nominal pipe diameter, the cutting start position is reached. Usually, since the holder unit 19 has come to the rightmost end in the previous peeling work, the operation of moving this unit 19 to the left is called blade return.

(3) Connect the outer rollers 31, 32 to the pipe P.
The scraper 1 is inserted into the end portion of the pipe P so that the inner surface rollers 35 and 36 are aligned with the inner surface P3 of the pipe P on the outer surface P2. At this time, the end surface P1 of the pipe P is inserted until it contacts the left contact surface of the main body 2. At this time, if the distance between the inner and outer rollers is narrow, turn the knob 45 to
Lower the inner rollers 35, 36.

(4) The knob 45 is turned to raise the arm 43 and the pedestal 47, and the inner rollers 35 and 36 are pressed against the inner surface P3 of the pipe. Thereby, the scraper 1 is fixed to the pipe P. At this time, the cutting tool 11 is pressed against the pipe outer peripheral surface P2 with an appropriate force by the biasing spring in the holder unit 19. Further, in the pipe P, as shown in an exaggerated manner in FIG. 1, since the diameter of the inner surface roller 35 is larger than the diameter of the inner surface roller 36, the arm 43
The inner roller shaft 41 is inclined with respect to.

(5) Grasp the grip 15 by hand and turn the entire scraper 1 along the circumference of the pipe P toward the front side in FIG. As a result, the cutting tool 11 peels the outer peripheral surface P2 of the pipe while rotating. At this time, the peripheral speed of rotation of the inner surface roller 35 (large diameter roller) on the pipe end surface side is higher than that of the inner surface roller 36 (small diameter roller) on the pipe opposite end side, so that the scraper 1 Momentum occurs such that the entire part tries to wrap around toward the opposite end side of the pipe P. Therefore, slipping out of the scraper 1 from the pipe P is naturally prevented.

At the same time, the grip 15 itself rotates once (rotates) with respect to the main body 2 while the entire scraper 1 makes one rotation. At this time, the lock screw 24 makes one rotation with respect to the feed screw shaft 13, and the feed screw shaft 13 is fed to the right by one pitch (4 mm). By continuing this, the bite 11 spirally forms the pipe outer peripheral surface P2.
Cut and peel the same side.

(6) When the baring holder unit 19 reaches the left side surface of the main body 2 as the peeling progresses, a force pulling the feed screw shaft 13 to the left is generated, and the lock screw 24 resists the biasing force of the spring 26. Then, the feed screw shaft 13 and the lock screw 24 are disengaged from each other. Therefore, the bite holder unit 19 cannot be sent to the right anymore, and even if the scraper 1 is continuously rotated, the bite 11 does not cut but idles. At this time, byte 11
If the width of the tip chip is smaller than the unit 19,
In some cases, the pipe end may be left uncut, but since it is the pipe end, there is no problem with fusion and no problem. This idle rotation allows the operator to recognize the completion of cutting. (7) Loosen the knob 45, remove the scraper 1 from the pipe P, and the work is completed.

In the scraper of this embodiment, the diameter of the inner surface roller 35 is larger than that of the inner surface roller 36. However, this structure can be applied to the outer surface roller. Further, for both the inner surface roller and the outer surface roller, the roller diameter on the pipe end side can be made larger than the roller diameter on the pipe opposite end side. In these cases as well, when the scraper rotates, a force is generated such that the entire scraper tries to wrap around toward the opposite end side of the pipe P, and the scraper 1 can be naturally prevented from slipping out.

[0041]

As is apparent from the above description, according to the present invention, it is possible to provide a pipe outer peripheral surface scraper capable of preventing the scraper from coming out from the end portion of the pipe.

[Brief description of drawings]

FIG. 1 is a view schematically showing a state in which a pipe outer peripheral surface scraper according to the present invention is attached to a pipe.

FIG. 2 is a side view showing an overall structure of a pipe outer peripheral surface scraper according to an embodiment of the present invention.

3 is a front view of the pipe outer peripheral surface scraper of FIG. 2. FIG.

FIG. 4 is a plan view showing a pedestal, a shaft, and an inner surface roller of the pipe outer peripheral surface scraper of FIG.

5 is a cross-sectional view taken along line XX of FIG.

FIG. 6 is a side view showing the entire structure of the scraper disclosed in Japanese Patent No. 3165382.

FIG. 7 is a front view of the scraper of FIG.

[Explanation of symbols]

1 Pipe outer peripheral surface scraper P Polyethylene pipe P1 End surface P2 Pipe outer peripheral surface P3 Pipe inner peripheral surface 2 Main body 4 Rib 5 Bushing 8 Small screw 10 Tool feed mechanism 11 Tool 12 Urea screw 13 Feed screw shaft 13a Feed screw 13b Hole 14 Poly stopper 15 Rotation Grip 15a Concavo-convex 15b Concave 15c Slit 16 Guide rod 19 Holder unit 21 Main body cylinder 21a Hollow hole 21b Hollow hole 22 Hole 24 Lock screw 25 Spring pin 26 Spring 30 Support means 31, 32 Outer roller 33 Outer roller shaft 34 Positioning plates 35, 36 Inner surface Roller 39 Plain washer 41 Inner roller shaft 41a Groove 43 Arm 43a Tip (left end) 43b Rib 43c Right end 45 Knob 47 Base 48 Bearing 49 Presser plate 51 Block 52 Spring pin 54 Puringupin 55 joint 61 male thread portion 63 nut 66 spring pin 67 small screws

Claims (2)

[Claims] 1. A scraper for stripping a skin of an outer peripheral surface of a pipe in the vicinity of an end surface of the pipe, which comprises a skin removing bite pressed against the outer peripheral surface of the pipe, and the bite circumferentially and axially along the outer peripheral surface of the pipe. And a holding mechanism for holding the bite feeding mechanism on the outer peripheral surface of the pipe, and a supporting means for supporting the bite feeding mechanism and the holding mechanism on the end of the pipe so as to be movable in a rotational direction, The supporting means includes a plurality of outer surface rollers pressed against the outer peripheral surface of the pipe, and a plurality of inner surface rollers pressed against the inner peripheral surface of the pipe, wherein the outer surface roller and / or the inner surface roller is the pipe. Of the pair of rollers arranged on the end face side and the opposite end face side of the pipe that rotate along the circumferential direction of the pipe peripheral surface, and the pair of rollers have the same phase. Together they are connected to form a rolling, pipe outer peripheral surface scraper diameter of the end face of the roller being greater than the diameter of the counter-end face of the roller. 2. The supporting means includes an arm rotatably attached to a scraper body, and a rod rotatably attached to a tip of the arm, wherein the pair of rollers is the rod. The pipe outer peripheral surface scraper according to claim 1, wherein the pipe outer peripheral surface scraper is attached to the end face side and the opposite end face side of the pipe so as to rotate integrally with the rod.