JPS5943058Y2 - Chamfering machine for pipe end faces of synthetic resin pipes - Google Patents

Description

[Detailed description of the invention] The present invention involves attaching a cutting blade to a rotating disk, providing a chip discharge groove on the rotating disk adjacent to the cutting blade, and rotating the rotating disk to use the cutting blade. This invention relates to a machine for chamfering the end surface of a synthetic resin tube by cutting and chamfering the end surface of the tube.

Conventionally, metal pipes have been used as city gas pipes, but medium density polyethylene t, for example, has appropriate rigidity and flexibility as a city gas pipe, and unlike metal pipes, it does not have the problem of underground corrosion. Recently, such synthetic resin pipes have been used because they have the excellent property of being able to be used semi-permanently.

When joining the ends of such synthetic resin pipes, fusion jointing is generally used. Therefore, the end surfaces of the pipes are heated with a heater to melt them, and the pipes to be joined are crimped together at a predetermined pressure for a predetermined period of time. It is integrated by cooling and solidifying.

In this case, in order to reliably join the pipes, it is necessary to chamfer the end faces of the pipes to make them uniform prior to the joining work.

Generally, a technique for chamfering the end surface of a tube in this manner is known, for example, from Japanese Utility Model Application No. 118188/1988.

However, city gas pipes are buried underground.
Since the joining work must always be performed on-site, the conventional device for chamfering the end of a metal tube cannot be applied since it is intended for processing in a factory.

Also, if cutting chips get into the pipe to be joined,
Since pipes buried in the soil cannot be removed to remove chips, it is necessary to prevent chips from entering the pipe during chamfering work.

In addition, in conventional chamfering machines, the relative position of the cutting blade and the chip discharge groove is inappropriate, so chips get into the pipe as described above, and the pressure of the cutting chips causes the cutting blade to attach. It floats up from the part and gets stuck in between, causing a blockage.
Cutting efficiency was impaired.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a machine for chamfering the end surface of a synthetic resin tube in which chips do not get into the tube or cause clogging.

In the chamfering machine according to the present invention, cutting blades are detachably attached to both sides of the rotating disk, and the tip portion of the cutting blade is installed within the chip discharge groove.

Therefore, as the rotary disk rotates, the cutting blade chamfers the pipe end face, but at that time, the chips cut by the tip of the cutting blade immediately enter the chip discharge groove and are closed by the uncut pipe end face. and is temporarily held in the chip evacuation groove.

Therefore, it will not get into the chamfered pipe.

Moreover, it does not get stuck between the rotating disk and the cutting blade.

Further, since the cutting blade is provided removably, it is easy to replace and is suitable for removing chips temporarily held in the chip discharge groove.

Furthermore, cutting blades are provided on both sides of the rotating disk, so
Both tubes to be joined can be chamfered.

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show a fusion device embodying the present invention for fusion bonding (butt fusion bonding) polyethylene pipes serving as city gas conduits at their end faces.

In the figure, 2 is a clamp that clamps one pipe to be joined, 3 is a clamp that clamps the other pipe, and clamps 2, 3
has two split rings 4a and 4b, one of the two split rings 4a is fixed and the other is pivotally connected to it by a ring 5, and the pipe is sandwiched between the two split rings 4a and 4b, and the pipe is split in half. The pipe is pressed and clamped by screwing together the female thread 6 connected to one of the rings 4a with the male thread 7 with a handle that engages with the other 4b of the split ring.

The ends of the tubes are then straightened.

One of the clamps 2 is fixed to the base 1 by a bolt 8, and a slide bearing 9 is provided at the bottom of the other clamp 3, and a slide bearing 9 is provided at the bottom of the other clamp 3, and the clamp 2 is attached to the fixed side along an axis 10.10. Slide towards it and approach.

A torque wrench (not shown) is connected to the link 11 for moving the clamp 3 towards the clamp 2, which in turn is pivoted to the base 1 by a link 12.

Therefore, by operating a torque wrench (not shown), the clamp 3 is slid toward the clamp 2.

A torque wrench typically provides a pressing force of about 450 Kf-z.

Before joining the pipes by fusion bonding, a chamfering machine according to the present invention, generally designated 13, is installed to cut the end faces of the pipes into uniform end faces, and a slide bearing 15 is installed at the bottom of the chamfering machine. mounted and moving along axis 10.10;
When not in use, it is rotated outward by a pivot 16 as shown in FIG.

A rotary disk 17 equipped with a cutting blade shown in FIGS. 3 to 6 is supported on the casing 14 of the chamfering machine 13, and the tube end surface is cut by rotating the disk 17 with appropriate power or human power. The chamfer is then chamfered.

Next, the rotating disk 17 will be explained.

A sprocket 18 is formed on the outer periphery of the rotating disk 17, and a chino (not shown) is applied to the sprocket 18, and the disk 17 is rotated by a motor or human power.

A cutting blade mounting recess 19 for mounting a cutting blade, a set screw screw insertion hole 20, and a chip discharge groove 21 adjacent to the cutting blade mounting recess 19 are formed on both sides of the rotating disk 170.

The cutting blade 22 is removably attached to the cutting blade attachment recess 19 by means of a set screw 23 (FIG. 8).

When performing butt fusion bonding of polyethylene pipes as city gas conduits using the above-mentioned fusion device, first loosen the male screws 7 of the clamps 2 and 3, and then split the two parts 4as.
4b, loosen the male screw 7 and tighten the clamps 2 and 3.
Clamp the tube with the

Next, the chamfering machine 13 is moved to the clamp 2 side and the clamp 3 side to rotate the rotary disk 17, and the cutting blade 22 cuts the tube end face to chamfer the tubes on both sides held by the clamps 2 and 3, respectively.

At that time, the chips enter the chip discharge groove 21, and the chips that enter the chip discharge groove 21 are temporarily moved into the groove 21 by the pipe end surface.
It is held inside and discharged outside after the cutting operation is completed.

After chamfering the tube end surface, the chamfering machine 13 is rotated outward as shown in FIG. 2 to chamfer the tube end surface (not shown).
Heat and melt in a tar.

Then, by operating a torque wrench (not shown), the movable clamp 3 is moved and pressed toward the fixed clamp 2 side.

A constant pressing force is maintained for a predetermined period of time, and when the tubes are cooled and solidified, the male screws 7 of the clamps 2 and 3 are loosened and the joined tubes are removed from the clamps.

In the conventional chamfering machine for the fusion device, as shown in FIG. Chips are trapped and accumulated at the boundary A of the tube, resulting in poor cutting ability and the chips cannot be discharged smoothly, resulting in some of the chips getting into the inner surface of the tube.

In the present invention, as shown in FIG.
is installed.

The mounting angle θ of this cutting blade 22 is preferably 30 degrees (the conventional one was 45 degrees).

Therefore, the biting of chips is eliminated, and all the chips can be retained in the chip discharge groove 21, so that they can be removed from the outside after the work is completed.

Therefore, the sharpness is improved and the entry of chips into the inner surface of the tube is completely eliminated.

As explained above, by using the chamfering machine according to the present invention, chips will not get caught and accumulate between the cutting blade and the disk on which it is attached, and the cutting quality will be significantly improved compared to conventional ones. At the same time, the inconvenience of chips entering the inner surface of the tube is eliminated.

In addition, the chamfering machine of the present invention can be used for chamfering synthetic resin pipes other than polyethylene pipes used as city gas pipes for other purposes, such as when used as water pipes, and even for chamfering synthetic resin products other than end-of-life pipes. Of course you can use it.

The shape of the discharge groove 21 is preferably rectangular in plane and cross section as shown in the figure, and by doing so, the chips can be discharged suitably.

[Brief explanation of the drawing]

FIGS. 1 and 2 show the entire structure of a fusion device embodying the present invention, with FIG. 1 being a partially sectional side view and FIG. 2 being a front view. Figures 3 to 6 show details of the rotating disk of the chamfering machine implementing the present invention, with Figure 3 being a plan view seen from one side, Figure 4 being a sectional view, and Figure 5 being viewed from the other side. 6 is a detailed sectional view, 7 is a sectional view of the cutting blade of a conventional chamfering machine, and 8 is a plan view.
The figure is a sectional view of a cutting blade of a chamfering machine implementing the present invention. 1...Base, 2...Fixed side clamp,
3...Movable side clamp, 4a, 4b...
・Half-split ring, 5...link, 6...
Female thread, 7... Male thread, 8... Set screw, 9... Slide bearing, 10...
・Axis, 11, 12...Link, 13...
・Chamfering machine, 14...Casing, 15...
...Slide bearing, 16...Pivot, 17
... Rotating disk, 18 ... Sprocket, 19 ... Cutting blade mounting recess, 20 ...
Set screw hole, 21... Chip discharge groove, 22...
... Cutting blade, 23 ... Set screw.

Claims (1)

[Scope of Claim for Utility Model Registration] A cutting blade is attached to a rotating disk, a cutting discharge groove is provided on the rotating disk adjacent to the cutting blade, and the rotating disk is rotated to cut the end face of a pipe with the cutting blade. In a machine that chamfers the end surface of synthetic resin pipes. A synthetic resin pipe, characterized in that cutting blades are detachably attached to both sides of the rotating disk, and the tip of the cutting blade is positioned within the chip discharge groove. chamfering machine for pipe end faces.