JPH0144318Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention mainly uses a coating material for pipes that are coated with a heat insulating layer on the outside, such as hot water distribution pipes for air conditioning, to connect them to the outside surface of the pipe for purposes such as pipe joining. It is a type of tool used when peeling from the joint surface of a tube. Specifically, it is a tool used to peel the coating material on the outside of the tube in a spiral shape into a rotary operation cylinder that can be fitted onto the tube whose outer surface is covered with the coating material. A blade body equipped with a round cutting blade capable of peeling the coating material from the outer surface of the tube and a peeling blade capable of peeling off the coating material from the outer surface of the tube is placed in a position facing a notch formed in the rotary operation cylinder body and penetrating the inner and outer surfaces of the cylinder body. This article relates to a stripper for cladding tubes that is attached.

This type of stripper guides the cutting edge of the blade by abutting the inner circumferential surface of the rotary operation cylinder and the outer circumferential surface of the sheathing material, and moves the cylinder from one end of the sheathing tube toward the axis. By simply rotating while applying pressure in the direction, the coating material on the outside of the pipe can be peeled off in a spiral shape through the cooperation of the round cutting blade and the peeling blade of the blade body. The present invention aims to enable the desired stripping work to be carried out efficiently and safely with a simple operation, compared to methods in which the coated portion over the required length of the cladding tube is sequentially cut with a knife or heated and melted. It was provided by

However, in the above-mentioned conventional devices, such as the one disclosed in Utility Model Application Publication No. 57-16314, the peeling blade is positioned at a lower position for round cutting in the cutting progress direction in the tube axis direction. As a result, the area of contact between the covering material on the outer periphery of the tube and the inner circumferential surface of the cylinder is small, resulting in a structure in which the cylinder easily sways relative to the tube. Therefore, in the past, a guide shaft member that fits into the pipe was provided in order to suppress the wobbling of the cylindrical body and to perform smooth cutting of the coating material into rings. The disadvantages are that it is large and the manufacturing cost is high.

Furthermore, the above-mentioned conventional device is configured so that the cutting action by the round cutting blade of the blade body is performed at the same time as or before the peeling action by the peeling blade in the circumferential direction of the rotating operation cylinder. Therefore, the cutting edge of the stripping blade comes into contact with the outer surface of the tube, and the cutting blade acts on the coating material that is in close contact with the tube, so that the stripping blade and the cutting blade are applied to the outer circumferential surface of the tube. It is easy to accidentally damage the paint-like protective layer such as the anti-corrosion layer. Moreover, in order to prevent such damage to the protective layer, the precision required for assembling and adjusting the attachment position of the blade according to the thickness of the coating material becomes high, and as a result, the assembly and adjustment work becomes more difficult. Since it requires a lot of time and effort, it has the disadvantage that the peeling work tends to be expensive.

The present invention was developed in view of the above-mentioned circumstances, and allows for easy peeling work by fitting the rotary operation cylinder onto the tube in a stable posture with less wobbling, without requiring any special guide member. It is an object of the present invention to provide a stripper for cladding tubes that can perform the stripping process well and can prevent damage to the outer circumferential surface of the tube by the blade as much as possible during stripping.

A characteristic configuration of the present invention for achieving the above object is that, in the above-described stripper for cladding tubes, the rotary operation cylinder is fitted onto the tube side surface of the stripping blade in the blade body. In this state, a guide portion that is in contact with the outer surface of the tube and has a substantially thicker wall toward the rear in the direction of progress of peeling the coating material is attached to the tube than the cutting edge of the peeling blade. The cutting blade is formed close to the inner side in the radial direction, and is configured so that the cutting blade acts to cut the coating material peeled off by the peeling blade, and the rotation operation is performed on the pipe. In the posture in which the cylindrical body is fitted onto the outside, the guide portion is disposed on a side farther from the end position of the coating material on the peeling start side than the cutting position with the ring cutting blade in the tube axis direction, and further, The rotary operation cylinder is inserted into the outer circumferential side of the tube in the area where the coating material is present, and the notch is attached to the rear of the rotational operation cylinder in the direction of movement in the tube axis direction due to peeling. opening on the side, and
The point is that the guide and the cutting edge of the peeling blade are positioned within the width of the notch in the tube axis direction.

This configuration provides the following effects.

In other words, when the wall thickness of the coating material is smaller than the amount of protrusion of the blade from the inner circumferential surface of the cylinder, even if the blade strongly contacts the outer circumferential surface of the tube, the state in which the rotary operation cylinder is fitted onto the tube will not occur. In this case, the guide part is located radially inward of the tube than the cutting edge of the stripping blade and comes into contact with the outer surface of the tube, so the cutting edge of the stripping blade is spaced upward from the outer surface of the tube. In this state, the cutting edge of the stripping blade lifts the coating material away from the outer surface of the tube, and the lifting force at this time is applied to the joint surface between the outer surface of the tube and the coating material due to the rigidity of the coating material itself. The coating material is peeled off. Then, with the peeling action of the peeling blade, the coating material is peeled off in a direction in which it is successively separated from the outer peripheral surface of the pipe, and then the floating peeled coating material is cut by the cutting blade, so that the outer peripheral surface of the pipe is To prevent or reduce the risk of accidentally damaging a coating film-like protective layer applied to a surface by using a peeling blade and a cutting blade.

Furthermore, the cylinder for rotational operation is fitted into the outer circumferential side of the tube in the area where the coating material is present, and this cylinder can be used as a guide means for rotational operation of the tube, and can also be used as a guide means for rotational operation of the tube. In the posture in which the cylindrical body is fitted onto the outside, the guide part is disposed on the side farther from the cutting position of the ring cutting blade when viewed from the cutting start position for peeling in the tube axis direction, so that the guide part Even if it is peeled off, it is not cut into strings yet, and it gets between the cylindrical covering material and the bare surface of the peeled pipe, reducing the wobbling of the cylindrical body with respect to the pipe, and cutting. The accompanying peeling work can be performed well.

Furthermore, with the stripping blade and the guide section located within the notch, the ring cutting blade is rotated in the circumferential direction of the tube, so the circumferential front and back of the cutting position of the coating material are held down by the cylinder, as described above. In addition, the sheathing material lifted by the guide portion toward the side away from the outer surface of the tube does not loosen, and the tensioned state of the sheathing material is maintained, making it easy to perform the cutting operation well.

Hereinafter, embodiments of the present invention will be described based on the drawings.

It constitutes a stripper used when peeling off the coating material A for joining etc. of a pipe P which has a coating material A such as a heat insulating layer on the outside, such as a hot water distribution pipe for air conditioning. As shown in FIGS. 1 to 5, a cylinder of an appropriate size is inserted into the rear end in the axial direction of the perfectly circular rotary operation cylinder 1 that can be externally fitted onto the cladding tube P, and penetrates in the rotational radial direction. A notch 2 is formed, and a cutting blade 3a capable of slicing the coating material A on the outside of the pipe P and a peeling blade 3b capable of peeling the coating material A from the pipe P are provided at the peripheral edge of the notch 2. A blade body 3 integrally formed into a substantially L-shape when viewed in the direction of rotational operation is attached via two screws 4, 4.

In this installation, as shown in FIGS. 1 to 3, the peeling blade 3b is placed in a position where the rotary operation cylinder 1 is fitted onto the pipe P, and the peeling blade 3b is used for peeling in the axial direction of the pipe P. When viewed from the cutting start position, that is, the tube end position, the peeling blade 3b is positioned on the side farther from the cutting position of the round cutting blade 3a, and the peeling blade 3b is moved around the circumference of the pipe P of the round cutting blade 3a. The notch 2 is positioned between the front end and the rear end of the notch 2 when viewed from the direction of travel.

When the ring-cutting blade 3a of the blade body 3 is rotated while applying a pressing force in the direction of the tube axis with the rotary operation cylinder 1 externally fitted from one end side of the cladding tube P, It is fixed at an appropriate lead angle with respect to the tube axis direction so that the covering material A on the outside of the tube P can be cut into a spiral band shape.

Moreover, grooves 5 along the axis direction of the cylinder 1 are formed at three locations equally spaced in the circumferential direction on the outer circumferential surface of the rotational operation cylinder 1, and each of these grooves 5
..., the three support tubes 7a of the stopper 7, which regulates the peeling length of the cladding tube P by contact with the end of the cladding tube P inserted into the cylindrical body 1, are attached to the cylindrical body 1.
The installation position can be changed in the axial direction of the screw 4.
It is attached via...

Thus, in a state where the rotary operation cylinder 1 is fitted onto the pipe P, the peeling blade 3b of the blade body 3 has a surface on the pipe P side that is in contact with the outer surface of the pipe P in the advancing direction of the coating material peeling. A guide portion 8 whose wall thickness increases toward the rear is integrally formed with the tube P closer to the radially inward side of the tube P than the cutting edge of the peeling blade 3b, and The cutting blade 3a is configured to cut the coating material A peeled off by the peeling blade 3b.

Due to the presence of the guide portion 8 integrally formed on the peeling blade 3b, even if the blade body 3 strongly contacts the outer peripheral surface of the pipe, the outer peripheral surface of the pipe P and the peeling blade 3b and the round cutting blade 3a are Since an appropriate gap is generated between the two, it is possible to effectively prevent the blade 3 from damaging the paint-like protective layer a such as an anticorrosive layer applied to the outer circumferential surface of the pipe P.

FIG. 6 shows another embodiment, in which at least one of the screw attachment holes 9 of the blade body 3 is formed into a long hole, and this blade body 3 is attached to the rotary operation cylinder 1. In contrast, the mounting position can be adjusted in the diametrical direction.

FIGS. 7 and 8 show another embodiment, which
The stopper 7 is bent into an L shape.
Support rods 7b that also serve as book rests... and these support rods 7b
It is composed of a connecting fitting 7c which clamps and fixes the free end portion of...

Furthermore, as another embodiment, the guide portion 8 may be constructed from a separate member from the peeling blade 3b. In this case, if the guide section 8 is made of a soft material such as rubber or synthetic resin, damage to the tube protective layer caused by the guide section 9 can be suppressed.

In the above-mentioned embodiment, the ring cutting blade 3a of the blade body 3 is provided on the lower end of the peeling blade 3b in the axis feeding direction, but it may be provided on both ends of the peeling blade 3b in the axis feeding direction.

Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

Figure 1 is a front view showing how the cladding stripper is used, Figure 2 is an enlarged front view of the stripper,
Fig. 3 is an enlarged cross-sectional view of the main part taken along the - line in Fig. 1, Fig. 4 is a view taken along the - line in Fig. 2, Fig. 5 is a sectional view taken along the - line in Fig. 2, and Fig. 6 is a separate view. FIGS. 7 and 8 are enlarged side views of the blade attachment part showing the embodiment of
The figures are a front view and a side view showing a stripper according to another embodiment. 1... Cylinder for rotational operation, 2... Notch, 3...
Blade body, 3a... blade for round cutting, 3b... blade for peeling,
8...Guide part, P...Sheathing tube, A...Sheathing material.

Claims (1)

[Claims for Utility Model Registration] 1. A rotary operation cylinder 1 that can be fitted onto a pipe P whose outer surface is covered with a sheathing material A, and a rotary operation cylinder 1 that can be used to slice the sheathing material A on the outside of the pipe P in a spiral shape. A blade 3 equipped with a blade 3a and a peeling blade 3b capable of peeling off the coating material A from the outer surface of the tube P is attached to a notch 2 formed in the rotary operation cylinder 1 and penetrating the inner and outer surfaces of the cylinder. In a cladding tube stripper attached in a facing position, in a state where the rotating operation cylinder 1 is fitted onto the tube P on the surface of the stripping blade 3b of the blade 3 on the tube P side,
A guide portion 8 that is in contact with the outer surface of the pipe P and has a substantially thicker wall thickness toward the rear in the direction of progress of peeling of the coating material is attached to the pipe P than the cutting edge of the peeling blade 3b. The ring cutting blade 3a is formed close to the radially inward side of the tube P, and is configured so that the ring cutting blade 3a acts to cut the coating material A peeled off by the peeling blade 3b. In the posture in which the rotary operation cylinder 1 is fitted onto the pipe P, the guide portion 8 is attached to the pipe P.
It is disposed in the axial direction on a side farther from the end position of the coating material A on the peeling start side than the cutting position with the ring cutting blade 3a, and furthermore, the rotary operation cylinder 1 is arranged so that the coating material A is In the state where the notch 2 is inserted into the outer circumferential side of the existing portion of the pipe P, the notch 2 opens to the rear side in the direction of movement of the rotary operation cylinder 1 in the axial direction of the pipe P due to peeling, and this Notch 2
A stripper for a cladding tube, characterized in that the guide 8 and the cutting edge of the stripping blade 3b are positioned within the axial width of the tube P. 2. The stripper for cladding tubes according to claim 1, wherein the blade body 3 is configured to be able to adjust its attachment position in the diametrical direction of the rotary operation cylinder 1. 3. The stripper for cladding tubes according to claim 1 or 2, wherein the guide portion 8 is integrally formed with the stripping blade 3b. 4. Utility model registration claim 1, in which the guide portion 8 is composed of a separate member from the peeling blade 3b.
The stripper for cladding tubes according to item 1 or 2.