JPH0230164Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a device for removing molten burrs generated on the inner surface of the joint when the ends of plastic pipes are butted and fused together. . (Prior Art and its Problems) Plastic tubes made of olefin resins such as polyethylene and polybutene are difficult to bond with adhesives, so fusion bonding with a heater is performed.

Generally, plastic tubes are fused together by simultaneously melting the end surfaces of both plastic tubes to be butt-jointed using a heater, and then butting and joining the tube end surfaces together.

However, in the case of this type of fusion bonding, when the end surfaces of the plastic tubes are pressed against a heater to melt them, the molten resin protrudes onto the inner surface of the tubes, and when these end surfaces are then pressed against each other, further Because the molten resin protrudes to the inner surface, large molten burrs occur on the inner surface of the joint.

When molten burrs occur on the inner surface of plastic pipes, the flow of fluid inside the pipe becomes poor, causing problems such as bacteria and algae growing in the areas where molten burrs protrude. There was no other way.

The present invention solves this problem by cutting off the molten burr that protrudes from the inner surface of the joint when the ends of plastic tubes are butted together and fused together to smooth the inner surface of the tube. The present invention provides a molten burr removal device that can remove molten burrs.

(Means for Solving the Problems) The present invention is a device for removing molten burrs protruding from the inner surface of a plastic tube, in which a guide member is provided at the tip of a cylinder body inserted into the plastic tube, so as to be in almost contact with the inner surface of the tube. At the same time, the shaft rod is rotatably inserted into the cylinder body. An axial tapered groove is provided at the tip of the shaft protruding from the end of the guide member, and a cutting blade is slidably engaged in the tapered groove to create a gap between the cutting blade and the guide member. A ring member is interposed between the two. Further, a holding member fitted over the tip of the shaft rod is brought into pressure contact with the cutting blade by the elastic force of a coil spring, and the cutting blade is held between the holding member and the ring member.

On the other hand, a gripping portion is provided at the other end base of the cylinder body, a support shaft is screwed into the gripping portion, and the support shaft and the other end base of the shaft rod are rotatably supported via a bearing. Further, when the cylinder body and the shaft rod are moved relative to each other in the axial direction, the cutting blade body is guided by the tapered groove and expands and contracts in the radial direction. .

(Function) The shaft is rotatably inserted into the cylinder body, and the support shaft is screwed into the grip provided at the base of the other end of the cylinder body, so that the support shaft and the base of the other end of the shaft are supported by the bearing. Since it is rotatably supported via the shaft, when the support shaft is rotated with the grip portion fixed, the cylinder body and the shaft rod move relatively in the axial direction. As a result, the cutting blade held between the ring member and the holding member fitted onto the tip of the shaft rod is guided by the tapered groove and expands and contracts in the radial direction.

Also, if you fix the grip and rotate the shaft,
A cutting blade provided at the tip of the shaft rotates to cut off the molten burr protruding from the inner surface of the plastic tube.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a longitudinal sectional view of a melting burr removal device showing an embodiment of the present invention, in which reference numeral 1 indicates a cylinder body;
2 is a shaft rod, 3 is a cutting blade body, 4 is a holding member, 5 is a ring member, 6 is a support shaft, 7 is a bearing, 8 is a handle,
P is a plastic tube made of olefin resin such as polyethylene or polybutene.

The cylinder body 1 has a length sufficient to reach the position where the molten burr protrudes from the open end of the plastic tube P, and has a scale marking on its outer circumferential surface to indicate the length from the cutting blade body 3. There is. A guide member 11 having an outer diameter slightly smaller than the inner diameter of the plastic tube P is provided at the tip of the cylinder body 1. The guide member 11 facilitates the insertion of the device into the plastic tube P, and
The cutting blade 3 is held at the center of the pipe during the molten burr removal operation described later, and a ring member 5 is attached to the tip side thereof.

On the other hand, a shaft rod 2 is rotatably inserted into the cylinder body 1, and its tip protrudes from the guide member 11. A tapered groove 21 inclined in the axial direction is provided at the tip of the shaft rod 2.
A cutting blade body 3 having an inclined surface is slidably engaged therein. The cutting blade 3 has a trapezoidal side shape with a tapered end, and is held between a holding member 4 and a ring member 5, which are inserted over the tip of the shaft rod 2.
That is, the holding member 4 is inserted outwardly from the tapered groove 21 toward the distal end side, and a coil spring 42 is interposed between the protrusion 41 provided on the inner peripheral surface and the collar 22 protruding from the distal end of the shaft rod 2. It consists of a structure.

Therefore, the cutting blade 3 is always held between the holding member 4 and the ring member 5 by the elastic force of the coil spring 42, and the cylinder body 1 and the shaft 2 are held together.
When these are moved relative to each other in the axial direction, the cutting blade 3 is guided by the tapered groove 21 and expands and contracts in the radial direction.

On the other hand, a grip part 12 is provided at the other end base of the cylinder body 1, and a female thread provided on the support shaft 6 is screwed into a male thread provided on the grip part 12. This support shaft 6 and the other end base of the shaft rod 2 are connected to a bearing 7.
The other end of the shaft rod 2 has a rotating handle 8.
is provided.

The apparatus of the present invention has the above-mentioned structure.Next, a working procedure for removing molten burrs protruding from the inner surface of the plastic tube P using this apparatus will be explained.

First, the cutting blade body 3 is reduced in diameter and the plastic tube P is
This device is inserted into the cylindrical body 1, and the cutting blade 3 is inserted to a position close to where the molten burr protrudes while observing the scale markings on the outer peripheral surface of the cylindrical body 1.

Therefore, the grip portion 12 is grasped and fixed by hand, and the support shaft 6 is rotated. Since the grip part 12 and the support shaft 6 are screwed together, when the support shaft 6 is rotated and moved to the left in the figure, the shaft rod 2 moves to the left together with the support shaft 6 and is guided into the tapered groove 21. The diameter of the cutter body 3 expanded. In this way, the cutting blade 3 is brought into light contact with the inner surface of the tube, and then the gripping part 12 and the support shaft 6 are integrally fixed.

Next, the grip portion 12 is grasped and fixed by hand, and the device is fed into the back of the plastic tube P while rotating the handle 8. By rotating the handle 8, the cutting blade 3 is rotated together with the shaft rod 2, and the molten burr protruding from the inner surface of the tube is cut off.

After removing the melted burr in this way, the diameter of the cutting blade 3 is reduced and the device is pulled out from inside the plastic tube P. To reduce the diameter of the cutting blade 3, hold the grip 12 with your hand, rotate the support shaft 6 in the opposite direction to the diameter enlargement operation described above, and move the shaft rod 2 to the right in the figure. good. It is preferable to eject pressurized air from the opposite side of the plastic tube P to discharge the cut chips of the molten burr.

Of course, the molten burr removal operation according to the present invention is not limited to the above-mentioned work procedure;
The molten burr may be gradually removed by rotating the shaft rod 2 while gradually expanding the diameter. Furthermore, if the cylinder body 1 and the shaft rod 2 are made flexible, even if the plastic tube is bent, the molten burrs protruding from the inner surface of the tube can be easily removed.

(Effects of the invention) As described above, the device of the invention rotates the cutting blade when the grip is held in place by hand and the handle is rotated, so it is easy to remove molten burrs protruding from the inner surface of the plastic tube. , and can be reliably removed.

In addition, when the gripping part is grasped by hand and the support shaft screwed therewith is rotated, the cylinder body and the support shaft rod move relative to each other in the axial direction, and the diameter of the cutting blade increases or decreases. By reducing the diameter of the cutting blade when inserting or pulling out this device into a plastic pipe, the inner surface of the pipe will not be damaged by the cutting blade.

As described above, the apparatus of the present invention can be used to smooth the inner surface of a plastic tube, so the apparatus of the present invention can be suitably used when joining pipes in an ultrapure water apparatus for cleaning electronic parts such as semiconductors.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a melting burr removal device showing an embodiment of the present invention. 1... Cylinder body, 2... Shaft rod, 3... Cutting blade body, 4
...Holding member, 42...Coil spring, 5...Ring member, 6...Support shaft, 7...Bearing, 8...Handle, P...Plastic tube.

Claims (1)

[Scope of utility model registration request] This device removes molten burrs protruding from the inner surface of a plastic tube, and includes a guide member 11 that is provided at the tip of a tube body 1 that is inserted into the plastic tube and is in almost contact with the inner surface of the tube, and a shaft rod 2 that is inserted into the tube body 1. A tapered groove 21 in the axial direction is provided at the tip of the shaft rod 2 which is rotatably inserted and protruded from the end of the guide member 11, and the cutting blade 3 is slidably engaged in the tapered groove 21. The ring member 5 is interposed between the cutting blade body 3 and the guide member 11, and the holding member 4, which is fitted onto the tip of the shaft rod 2, is pressed against the cutting blade body 3 by the elastic force of the coil spring 42. The cutting blade body 3 is held between the holding member 4 and the ring member 5, while the cylinder body 1 is held between the holding member 4 and the ring member 5.
A gripping portion 12 is provided at the other end base, a support shaft 6 is screwed into the gripping portion 12, and the support shaft 6 and the other end base of the shaft rod 2 are rotatably supported via a bearing 7. When the cylinder body 1 and the shaft rod 2 are moved relative to each other in the axial direction, the cutting blade 3 is guided by the tapered groove 21 and expands and contracts in the radial direction. Melting burr removal device on the inner surface of the tube.