JPH03117502A - Device for machining outside circumferential surface of pipe end part - Google Patents

Abstract

PURPOSE:To perform machining of a pipe outside circumferential surface by providing three rollers, capable of approaching to and departing from a main spindle, in parallel to the main spindle having an orthogonally crossing arm at its base end part, by supporting the inside circumferential surface of a pipe end with the rollers, and by moving a handle of a support rod fitted on the arm and equipped with a cutting tool forward/rearward. CONSTITUTION:When an end part of a pipe P is placed around a main spindle 1, three rollers 2 parallel to the main spindle 1 are spread by a handle 9 to press an inside circumferential surface of the pipe P. A handle 5 is inserted in an arm 12, which is orthogonally crossing the main spindle 1 and is arranged on the base end part thereof, and is capable of moving forward/rearward by means of a screw 53 to move a cutting tool support rod 4 forward/rearward, which is connected to the handle 5. When an arm 12 is rotated by a grip part 52 of the handle 5, the handle 5 is moved forward/rearward in compliance with a specified pitch of the screw 53 and accordingly a cutting tool 3 is rotated while cutting the outside circumferential surface of the pipe P. In this case, the pipe P is machined while its inside circumferential surface is secured by the rollers 2 of the rotating main spindle 1, and therefore even a long size pipe can be machined on its pipe end outside circumferential surface.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application on M Beams) The present invention relates to a pipe end outer peripheral surface cutting device for cutting the pipe end outer peripheral surface of a synthetic resin pipe.

(Prior art) When connecting thermoplastic resin pipes, a synthetic resin pipe joint with a heating element such as a resistance wire embedded in the inner peripheral surface of the socket is used.
With the end of the pipe inserted into the socket of this pipe joint, the heating element is energized to generate heat, thereby fusing the inner peripheral surface of the socket and the outer peripheral surface of the pipe end to connect both pipes. The technology is known.

In this case, in order to ensure that the two are fused together, it is necessary to completely remove dirt and oxide film adhering to the outer circumferential surface of the tube end. A method of cutting the surface is used.

To cut the outer circumferential surface of a tube end, a cutting tool such as a knife or a scraper such as the one disclosed in US Pat. No. 4,663,794 has conventionally been used. The above-mentioned scraper includes an arcuate frame having an inner diameter that almost matches the outer diameter of the tube and is provided with a plurality of rollers that come into contact with the outer peripheral surface of the tube, and a handle attached to the proximal end of the frame. , a cutting blade support member pivotally attached to the tip of the frame; a cutting blade attached to the tip of the cutting blade support member; It consists of a pressure section that applies a predetermined pressure force to the member. To use it, first weaken the pressure force of the pressure section, open the cutting blade support member outward, and insert it into the frame. Insert the tube end.

Next, adjust the pressing force of the pressurizing part to press the cutting blade against the outer circumferential surface of the tube end, and turn the frame along the outer circumferential surface of the tube using the handle. Thereby, the outer circumferential surface of the tube end is cut by the cutting blade.

(Problem to be Solved by the Invention) However, when cutting the outer peripheral surface of the tube end with a knife, etc., it is necessary to hold the knife in one hand and rotate the tube around its axis with the other hand. This method involves cutting the outer peripheral surface of the tube, but since most tubes are actually long and wound in rolls, it is impossible to rotate the tube around its axis. , is almost impossible unless the tube is short or the tube diameter is very small.

On the other hand, with the above-mentioned scraper, the frame must match the outside diameter of the pipe, so there is a problem in that it is necessary to prepare scrapers of various sizes depending on the outside diameter of the pipe. . Furthermore, when used on a pipe with a large outer diameter, the resistance during cutting becomes extremely large, and there is a problem in that it sometimes cannot be turned at all and cannot be cut. Furthermore, when cutting the outer circumferential surface of a pipe end, it is necessary to scrape a predetermined area, but since such scrapers have high cutting resistance, they are rarely cut while moving along the pipe axis. However, there were also problems such as poor workability.

The present invention has been made in view of the above-mentioned conventional problems, and provides a pipe end outer peripheral surface cutting device that can extremely easily cut the pipe end outer peripheral surface of synthetic resin pipes of various pipe diameters. It is something to do.

(Means for Solving the Problems) A pipe end outer peripheral surface cutting device according to the present invention is a device for cutting the pipe end outer peripheral surface of a synthetic resin pipe, and is rotatable around an axis, A main shaft in which an arm part is provided at the base end perpendicular to the axis, and an arm part is provided around the distal end of the main shaft in parallel with the main shaft and movable toward and away from the main shaft, and at least three tube end support rollers that support the tube end by pressing the inner circumferential surface of the tube end of the synthetic resin tube from the inside; A main handle is provided so as to be rotatable around the circumference and move forward or backward at a predetermined pitch in the axial direction as the arm portion rotates; a cutting blade support rod connected above the cutting blade support rod so as to be rotatable around the axis; and a support rod rotation regulating means provided on the arm portion for restricting rotation of the cutting blade support rod around the axis. and a cutting blade attached to the cutting blade support rod with the cutting edge facing the main shaft.

(Function) First, the tube end support roller is made narrower than the inner diameter of the synthetic resin tube, and then the tube end is fitted onto the tip of the main shaft. Next, the tube end support rollers are expanded outward and pressed against the inner circumferential surface of the tube end. Thereby, the tube end portion is supported in a state where the tube axis and the axis of the main shaft are aligned. Next, adjust the position of the cutting blade so that the cutting edge touches the outer peripheral surface of the tube end. In this state, when the grip portion of the main handle is gripped and the arm portion of the main shaft is rotated in any direction around the axis of the main shaft, the main handle moves forward or backward at a predetermined pitch in the direction of the axis. At this time, the cutting blade support rod is rotatably connected to the main handle, and rotation around the axis is restricted by the support rod rotation restriction means, so that only the forward movement or backward movement of the main handle can occur. Interlock. As a result, the cutting blade supported by the cutting blade support rod rotates around the synthetic resin tube while advancing or retreating along the axial direction of the main shaft with its cutting edge always facing the synthetic resin tube.

At this time, since the tube end support roller revolves around the axis of the main shaft while rotating around its axis, the synthetic resin tube itself does not rotate. As a result, the outer circumferential surface of the tube end is helically cut by the cutting blade while being supported and fixed by the tube end support roller from the inside. In this way, the tube end is supported and fixed by the tube end support roller from the inner peripheral surface side, and the cutting blade rotates together with the roller, so that the synthetic resin tube can be easily aligned. Cutting is performed, and the outer circumferential surface of the tube end is cut to a constant thickness.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall perspective view showing a tube end outer peripheral surface cutting device according to the present invention.

This device consists of a main shaft 1, three tube end support rollers 2...
-, a cutting blade 3, a cutting blade support rod 4, a main handle 5, and a support rod rotation regulating means 43.

An arm portion 12 is provided at the base end 11 of the main shaft 1 so as to be perpendicular to the axis of the main shaft 1, and a tube attachment handle support hole 123 is provided near the main shaft 1 of the arm portion 12 so that the arm portion 12 is perpendicular to the axis of the main shaft 1. It extends through the shaft so that it is parallel to the axis of the main shaft 1, and has a female thread carved on its inner circumferential surface. The pipe mounting handle support hole 1
23 is screwed with a pipe attachment handle 9, which is formed by a handle portion 92 provided at one end of a threaded rod 91.

A socket 8 is provided near the base end 11 of the main shaft 1.
It is fitted onto the outside so that it can slide in the axial direction.

The socket 8 is a cylindrical body having an inner diameter that is approximately equal to the outer diameter of the main shaft 1, and a contact piece that comes into contact with the tip of the threaded rod 91 of the pipe attachment handle 9 is provided at a suitable location on the outer surface of the socket 8. 81 is provided.

The tube end support rollers 2 support the tube end by pressing the inner circumferential surface of the tube end of the synthetic resin tube P from the inside, and rotate 120 degrees around the tip 13 of the main shaft 1. They are provided parallel to the main shaft 1 at intervals and capable of approaching and separating from the main shaft 1.

That is, a link mechanism 6 consisting of the tip 13 and three links 61, 62, 63 is attached to the tip 13 of the main shaft l.
... are arranged at 120 degree intervals around the main axis l, and each tube end support roller 2... is connected to a link 62 parallel to the main axis l among the links of each link mechanism 6...・・・
- are rotatably attached to, for example, via bearings (not shown) or the like. Each of these link mechanisms 6... is configured to be able to swing in the axial direction of the main shaft 1, so that each of the tube end support rollers 2
... can approach and separate from the main shaft 1. In addition, each link 6 located on the base end 11 side of the main shaft l
1... are connected to the socket 8 via the connecting rod 7..., and the tube end support rollers 2... are positioned corresponding to the position of the socket 8. ing.

A main handle mounting hole 121 is provided in the middle of the arm portion 12 of the main shaft l so that its axis is parallel to the axis of the main shaft. It is set up.

The main handle 5 is provided with a connecting part 51 at the tip thereof,
A grip portion 52 is provided at the base end, and a male thread 53 is carved on the outer peripheral surface in the middle thereof. The main handle 5 is supported in the main handle attachment hole 121 by screwing the male thread 53 and the female thread of the main handle attachment hole 121 together.

The cutting blade support rod 4 is provided with a connecting portion 41 on the base end 11 side of the main shaft 1, and this connecting portion 41 is connected to the main handle 5.
As shown in FIG. 2, it is connected to the connecting portion 51 of , for example, via a bearing.

Therefore, the cutting blade support rod 4 and the main handle 5 are made to be rotatable about the same axis and interlock with each other in the direction of the same axis. Further, on the opposite side of the connecting portion 41, a cutting blade support portion 42 for supporting the cutting blade 3 is provided. The cutting blade support part 42 has the cutting blade 3 connected to the synthetic resin pipe P 17. An adjustment handle 421 is provided for approaching and separating.

The support rod holding means 43 has support holes 432 and 432.
and a cutting blade support rod 431, 431. The support holes 432, 432 are formed through G holes in a line along the opposite hand direction of the art portion 12, with the main handle attachment hole 121 in between, so that their axes are parallel to the axis of the main shaft 1. It is set up. Cutting blade support rod sabot) 43
1,431 is supported in the support holes 432, 432 so as to be slidable in the direction along the axis of the main shaft 1, and the tip of each is bent toward the cutting blade support rod 4 side. It is connected to 4. By this support rod rotation restricting means 43, the cutting blade support rod 4 is held parallel to the main axis in a state where rotation around its axis is restricted.

The cutting blade 3 is connected to the cutting blade support part 4 of the cutting blade support rod 4.
2, its cutting edge faces the main shaft 1 and comes into contact with the outer circumferential surface of the end of the synthetic resin pipe P to cut the outer circumferential surface of the end of the synthetic resin pipe P. Note that the cutting blade 3 preferably has a short blade length in order to reduce cutting resistance.

Next, a method of using the tube end outer peripheral surface cutting apparatus according to the present invention as described above will be explained.

First, the tube attachment handle 9 screwed onto the arm portion 12 of the main shaft 1 is rotated in one direction to move the tube attachment handle 9 toward the base end 11 of the main shaft 1.

Then, the pipe attachment handle 9 is removed from the contact piece 81 of the socket 8.
The tip of the threaded rod 91 is separated. And 4 sockets 8
By moving toward the base end 11 side of the main shaft 1,
The link mechanisms 6 connected to the sockets 8 via the connecting rods 7 are closed, and the rollers 2 are narrowed. Further, the cutting blade 3 is separated from the main shaft 1 by operating the adjustment handle 421.

Next, fit the synthetic resin pipe P onto the pipe end support rollers 2 around the main shaft 1, hold the main handle 5 to prevent the main shaft 1 from rotating, and then move the pipe mounting handle 9 toward the front. By rotating the socket 8 in the opposite direction and sliding the socket 8 toward the tip 13 side of the main shaft 1, the tube end support rollers 2... are expanded outward, and the tube end support rollers 2... The outer peripheral surface of the synthetic resin pipe P is brought into contact with the end of the pipe. The synthetic resin pipe P is now supported and fixed by the pipe end support rollers 2 with the pipe axis of the synthetic resin pipe P and the axis of the main shaft 1 aligned.

Subsequently, the adjustment handle 421 is operated again to bring the cutting blade 3 into contact with the outer peripheral surface of the end of the synthetic resin pipe P. After completing this, grip the grip part 52 of the main handle 5 and
2 around the axis of the main l1I11. Then, since the main handle 5 is screwed into the main handle attachment hole 121 of the arm portion 12, the main handle 5 is rotated at a predetermined pitch in the axial direction (the pitch of the female thread of the main handle attachment hole 121).
to move forward or backward. The cutting blade support rod 4 is rotatably connected to the main handle 5 via both connecting portions 41.51, and the cutting blade support rod support 431.4
Since rotation around the axis is restricted by 31, the main handle 5 only moves forward or backward. As a result, the cutting blade 3 supported by the cutting blade support rod 4 moves forward or backward along the axial direction of the main shaft 1 with its cutting edge always facing the synthetic resin pipe P. Rotate around. Also, at this time, the tube end support roller 2
... revolves around the axis of the main shaft 1 while rotating around its axis, so the synthetic resin pipe P itself does not rotate. however,
In some cases, the synthetic resin pipes P may also rotate together due to frictional force, so in that case, it is best to firmly hold down the four synthetic resin pipes P. In this way, the outer circumferential surface of the tube end is helically cut by the cutting blade 3 while being supported by the tube end support rollers 2 from the inside. and,
If the cutting blade 3 has a short blade length, the cutting resistance will be reduced and no large force will be required for cutting.

In the above embodiment, the positions of the tube end support rollers 2... were changed by moving the sockets 8, but for example, the connection connecting the tube end support rollers 2... and the sockets 8 Remove rod 7... and remove tube end support roller 2...
An elastic member (for example, a coil spring, etc.) that always biases the tube end support roller 2 in a direction away from the main shaft 1 is appropriately attached to the link mechanism 6 supporting the tube end support roller 2. Good too.

Further, in the embodiment, the support rod rotation regulating means 43 includes the support hole 432° 432 provided in the arm portion 12;
The cutting blade support tube supports 1-431° 431 are slidably supported in these support holes 432, 432, but the present invention is not limited thereto. For example, as shown in FIGS. 3 and 4, a support portion 431 is integrally extended from the arm portion 12, and the cutting blade support rod 4 slides into a support hole 432 provided in the support portion 431. May be supported as possible. That is, in the one shown in FIG. 3, a key 44 is embedded in the cutting blade support rod 4 so that rotation of the cutting blade support rod 4 with respect to the support portion 431 is restricted, while a key 44 is embedded in the support hole 432. The key 44
A keyway 433 corresponding to this is formed. Also, the fourth
In what is shown in the figure, the cutting blade support rod 4 has a rectangular cross-sectional shape, and the support hole 432 has a shape corresponding to the cutting blade support rod 4.

Furthermore, in the embodiment, the connecting portion 41 of the cutting blade support rod 4
The bearing 1 is connected to the connecting portion 51 of the main handle 4.
Although 0 is used, it need not be limited to this.

(Effects of the Invention) As explained above, the tube end outer peripheral surface cutting device of the present invention does not require rotating the synthetic resin tube for its tube axis, so it can be used even if the synthetic resin tube is long. Even if there is, the outer circumferential surface of the tube end can be cut extremely easily without any problems.

In addition, since the tube end is supported by a tube end support roller that can approach and move away from the main shaft, it is possible to cut the outer circumferential surface of the tube end of synthetic resin tubes of various outside diameters with just this roller. I can do it.

Furthermore, since the inner circumferential surface of the tube end is pressed and supported from the inside by the tube end support roller, the tube end does not bend due to the pressing force of the cutting blade, and the center of rotation and the synthetic resin tube are The axis is defeated. Therefore, the outer periphery of the tube end can be cut uniformly.

[Brief explanation of drawings]

FIG. 1 is an overall perspective view showing an embodiment of a pipe end outer circumferential surface cutting device according to the present invention, FIG. 2 is a partial sectional view showing a connecting portion between a cutting blade support rod and a main handle, and FIG. FIG. 4 is a perspective view showing support rod rotation regulating means of other embodiments. 1... Main shaft 11... Base end part 12... Arm part 13...
- Tip part 2... Pipe end support roller 3... Cutting blade 4... Cutting blade support rod 43... Support rod rotation regulating means 5... Main handle

Claims (1)

[Scope of Claims] 1) A device for cutting the outer circumferential surface of an end of a synthetic resin pipe, which is rotatable around an axis, and has an arm section at a base end perpendicular to the axis. A main shaft is provided, and a main shaft is provided around the distal end of the main shaft, parallel to the main shaft, and movable toward and away from the main shaft, and presses the inner peripheral surface of the pipe end of the synthetic resin pipe from the inside. at least three tube end support rollers that support the tube end with the support roller; a main handle that is provided so as to be able to move forward or backward at a predetermined pitch in the axial direction according to the main handle; a cutting blade support rod; a support rod rotation regulating means provided on the arm portion to restrict rotation of the cutting blade support rod about its axis; and a cutting blade support rod with a cutting edge facing the main axis. A device for cutting the outer peripheral surface of a tube end, comprising a cutting blade attached in this manner.