JPH0212743B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for covering the outer surface of a pipe with a tape, and in particular, a heat-shrinkable tape is used as the tape, and the heat-shrinkable tape is applied to the pipe by rotating the pipe. By wrapping around the outer surface of the pipe with certain means that are moved in the axial direction,
Wrapping heat-shrinkable tape on the outer surface of a pipe to avoid entrapping air when wrapping the heat-shrinkable tape and to easily wrap the heat-shrinkable tape around the pipe without taking up space. It is related to the device.

Conventionally, various methods have been used to coat pipes with synthetic resins, etc. for corrosion protection, but these methods, for example, tend to trap air and do not provide sufficient corrosion protection, take up space, There were various problems such as the need for large equipment.

In view of the above-mentioned points, the present invention has been made with the aim of providing a pipe that can reliably have a corrosion-proofing effect in a relatively simple manner, and uses a heat-shrinkable tape as a covering material on the outer surface of the pipe. However, the above object is achieved by wrapping the heat-shrinkable tape around the outer surface of the pipe by a specific means that moves it in the axial direction of the pipe as the pipe rotates.

That is, in the present invention, a frame rotatably equipped with a plurality of turning rollers is provided on a pipe rotating in a fixed position, the turning rollers are brought into rolling contact with the upper part of the pipe, and the axis of the turning roller is The frame is suspended on the pipe via the turning roller while being tilted at a desired angle with respect to the axial direction of the pipe, and the frame is provided with a heating device for heating the outer surface of the pipe; A tape supply device for supplying a heat-shrinkable tape is provided on the outer surface, and as the pipe rotates, the heating device and the tape supply device are moved in the axial direction of the pipe, and the heat shrinkable tape is heated while heating the pipe. The shrinkable tape can be continuously wrapped around the outer surface of the pipe,
This invention provides a device for wrapping heat-shrinkable tape around the outer surface of a pipe.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of an apparatus for wrapping a heat-shrinkable tape around the outer surface of a pipe according to the present invention will be described as shown in the drawings.

In FIG. 1, a pipe 1 is suspended between a pipe chuck/pipe rotation drive section 2 and a pipe end support section 3, and is rotated at a fixed position as shown in the figure by the rotational drive of the pipe chuck/pipe rotation drive section 2. It's like this. Further, reference numeral 4 denotes a frame including a heating device 51 for heating the outer surface of the pipe 1;
51, 51, 51 and a tape supply device 61 for supplying the heat-shrinkable tape 7 to the outer surface of the pipe 1, and rotatably attached turning rollers 52, 52, 52, 52. , 52, 52 and is suspended from the pipe 1.

Therefore, in the apparatus for wrapping a heat-shrinkable tape around the outer surface of a pipe according to the present invention, the turning roller 52,
52, 52, 52 are in rolling contact with the upper part of the pipe 1 as shown in FIG. 52
Since it is suspended from the pipe 1 via the frame 4,
The pipe 1 can be moved in the axial direction by the rotational force of the pipe 1, and therefore, during this movement, the pipe 1 is heated by the heating devices 51, 51, 51, 51, and the heated outer surface of the pipe 1 is heated. By supplying the heat-shrinkable tape 7 from the tape supply device 61, the heat-shrinkable tape 7 can be continuously wound spirally around the outer surface of the pipe 1.

To explain the embodiment in more detail, the pipe chuck/pipe rotation drive unit 2 is a scroll chuck 2 that chucks the right end of the pipe 1 from the inside.
1 is rotationally driven by a motor with a continuously variable transmission, and the rotational speed of the pipe 1 can be arbitrarily adjusted according to various conditions such as tape width, tape winding speed, tape wrapping width (overlap width), etc. be.

In addition, the pipe end support section 3
A pipe support shaft 32 is rotatably attached to the upper part of the pipe 1, and in the case of the embodiment, it is held on the pipe support shaft 32 via a dummy pipe 81 having the same diameter as the pipe 1. The reason why the dummy pipe 81 is used in this way is that the tape supply device 61 is used at the end of tape winding.
is positioned below the dummy pipe 81 so that the heat-shrinkable tape 7 can be wrapped around the left end of the pipe 1, and when replacing the pipe 1, the frame 4
This is to ensure that it does not become a hindrance. In addition, the trolley 31 has two
It is possible to run on the book rails 84, 84, and by rotating the handle 85 of the trolley regulating part 83 provided at the left end of the rails 84, 84,
Carriage 31 serves as pipe chuck and pipe rotation drive unit 2
The pipe 1 can be pressed in this direction to prevent the pipe 1 from falling off. On the other hand, as shown in FIG. 4, two rails narrower than the rails 84, 84 are provided below the pipe 1 along the pipe 1 between the bogie regulating section 83 and the pipe chuck/pipe rotation drive section 2. Rails 82, 82 are provided. And rail 8
Reference numerals 2 and 82 have a function of causing the frame 4 to travel when returning the frame 4 to the tape winding start position after the tape winding is completed, and a pipe chuck/pipe rotation drive unit 2.
By connecting the trolley regulating portion 83 to the trolley regulating portion 83, the device also has the function of allowing the simple type device for winding heat-shrinkable tape around the outer surface of a pipe of the present invention to be assembled at a tape winding site.

In order to prevent the lower part of the frame 4 from colliding with the lower frame 31a of the trolley 31 when wrapping the tape 7 around the left end of the pipe 1 in FIG. as,
A space 31b having a width larger than the width of the frame 4 is provided in the center of the lower frame 31a of the truck 31.

Further, as shown in FIGS. 2 and 4, the frame 4 is constructed by connecting an upper frame 5 via toggle clamps 53, 53, 53, 53 to a lower frame 6 that functions as a return trolley. Yes, toggle clamps 53, 53, 53, when winding tape.
53 to pull the upper frame 5 and lower frame 6 together as shown by solid lines in FIG.
2, 82, and the frame 4 can be suspended from the pipe 1 via the turning rollers 52, 52, 52, 52. On the other hand, when the frame 4 is returned to the tape winding start position after the tape winding is completed, By pressing down the toggle clamps 53, 53, 53, 53, the turning rollers 52, 52, 52, 52 are moved to the pipe 1 as shown by the two-dot chain line in FIG.
At the same time, the lower frame 6 is removed from the rail 8.
2, 82 so as to be able to run in contact with them.

In addition, turning rollers 52, 52, 52, 5
2 is attached to the inside of the upper part of the frame 4, more specifically, the upper frame 5, in the manner described above, and its attachment angle with respect to the diameter direction of the pipe 1 can be adjusted by adjusting the tape width, tape winding speed, and tape wrapping width. The axis of the turning rollers 52, 52, 52, 52 is determined by taking into consideration various conditions such as (overlap width), and the angle mounting scales 55, 55, 55, 55 of the upper frame 5 are
This can be done by fixing it using as a guideline.
By adjusting the mounting angle in this manner, it becomes possible to move the frame 4 to the left in the axial direction of the pipe 1 at a desired speed by rotating the pipe 1 while the frame 4 is suspended from the pipe 1. In addition, 54, 54 is a free bear attached to the upper frame 5 via a spring etc. so as to be in pressure contact with the lower part of the pipe 1, and when the tape is wound, the turning rollers 52, 52, 52, 5
2 is kept in pressure contact with the pipe 1 at all times to prevent slipping of the turning rollers 52, 52, 52, 52, lifting of the frame 4, etc.

Further, the heating devices 51, 51, 51, 51 are attached to the tips of small diameter tubes branched from two annular base tubes 51a, 51a attached to the upper frame 5, as shown in FIG. , and consists of a gas burner that injects flame onto the outer surface of the pipe 1 at a constant angle, and a total of four burners are provided on the upper and lower sides of the upper frame 5 on the right and left sides of the drawing. In this case, the heating devices 51, 51 on the right side are the heating device 5 on the left side.
1 and 51, the right end of the pipe 1, which cannot be heated by the heating devices 51 and 51, is heated at the time of starting tape winding. pipe 1
is heated. The number of heating devices 51 to be used is appropriately selected depending on the diameter of the pipe 1 to be heated.
Furthermore, the arrangement is not limited to the pair of upper and lower sides on the right and left sides in FIG. 1 as described above.
For example, a total of four burners may be provided in pairs on the right and left sides in FIG. 1, respectively. Although not shown, for example, a hood having a substantially semicircular cross section is provided on the upper frame 5 so as to cover the upper heating devices 51, 51 from above.
1, 51, 51, 51 can be enhanced.

Further, the tape supply device 61 is provided with a frame 4 by rotating the pipe 1 at one end of a tape winding angle adjustment frame 62 which is rotatably supported vertically on the lower frame 6.
It is installed at the rear in the direction of travel. The tape winding angle adjustment frame 62 is fixed at a desired angle as shown in FIG. 1 by attaching the other end to the lower frame 6 via the angle adjustment bar 63 at a desired height, and the tape winding angle adjustment frame 62 is fixed at a desired angle as shown in FIG. The heat-shrinkable tape 7 can be wrapped around the pipe 1 from the device 61 at a desired wrapping angle. Moreover, the tape supply device 61
As shown in FIG.
6 and a roll 67 with a brake are provided at one end of the tape winding angle adjustment frame 62. According to such a tape supply device 61, the tape roll 64 can be easily replaced. Notch 6
The heat-shrinkable tape 7 is freely unrolled from the tape roll 64 in which the shaft portion is inserted and held in the heat-shrinkable tape 5.
is a guide roll 66 and a brake roll 67
The pipe 1 is wound around the pipe 1 and is supplied to the rotating pipe 1 while being applied with a desired tension by the braking action of the brake roll 67. in this case,
The braking action of the roll with brake 67 can be adjusted by adjusting the tightening force of the band 68 of the roll with brake 67 with the screw 69. By supplying to pipe 1,
This improves the adhesion of the heat-shrinkable tape 7, which starts heat-shrinking as soon as it comes into contact with the heated pipe 1, to the pipe 1, and prevents air entrapment, wrinkles, etc. when wrapping the heat-shrinkable tape 7. be able to.

The heat-shrinkable tape 7 used in the device for wrapping the heat-shrinkable tape around the outer surface of a pipe according to the present invention is, for example, a heat-shrinkable crosslinked polyethylene tape having an adhesive layer on one side. It is preferable that the gel fraction is 10 to 90%, particularly 20 to 80%, and the shrinkage rate is 5 to 80%, particularly 10 to 50%. Further, the apparatus for wrapping heat-shrinkable tape around the outer surface of a pipe according to the present invention is suitably used when winding the heat-shrinkable tape 7 around the outer surface of a relatively small-diameter pipe 1 having a diameter of about 4 to 8 inches. In addition, in the apparatus for wrapping a heat-shrinkable tape around the outer surface of a pipe according to the present invention, the tape preheating burner is connected to the upper frame 5, for example.
The heat-shrinkable tape 7 supplied from the tape supply device 61 is preheated immediately before being wrapped around the pipe 1, so that the heat-shrinkable tape 7 is heat-shrinked at the overlap step immediately after it comes into contact with the pipe 1. and degassing by adhesive flow,
Adhesion may be performed effectively.

Next, the manner in which the heat-shrinkable tape 7 is wound around the outer surface of a pipe by the heat-shrinkable tape-wrapping device of the present invention having the above-mentioned configuration will be explained mainly based on FIG. 1. As described above, the pipe 1 is suspended between the pipe chuck/pipe rotation drive part 2 and the pipe end support part 3,
In addition, when the frame 4 is in a state where the upper frame 5 and the lower frame 6 are brought into close contact with each other, turning rollers 52, 52,
It is suspended from the right end of the pipe 1 through the pipes 52 and 52, and the rotating speed of the pipe 1 and the upper frame are adjusted according to the desired tape width, pipe wrapping speed, tape wrapping width (overlap width), and tape wrapping angle. Turning roller 52, 52, 52, 52 to 5
and the mounting angle of the tape winding angle adjustment frame 62 to the lower frame 6 are adjusted in advance.

Next, when the pipe 1 is rotationally driven by the motor 22 with a continuously variable transmission, the frame 4 moves to the left in the axial direction of the pipe 1 at a desired speed due to the rolling contact action of the turning rollers 52, 52, 52, 52 to the pipe 1. Move with. At the initial stage of the movement of the frame 4 due to the rotation of the pipe 1, the four heating devices 51, 5 are not supplied with the heat-shrinkable tape 7 to the pipe 1.
Flames are injected from all of the pipes 1, 51, and 51 to corresponding locations on the outer surface of the pipe 1, and the vicinity of the right end of the pipe 1 is sufficiently heated to the heat shrinkage temperature of the heat shrinkable tape 7. When the heating near the right end of the pipe 1 is finished, the heating by the right heating devices 51, 51 is stopped, and the tip of the heat-shrinkable tape 7 fed out from the tape supply device 61 is fixed to the right end of the outer surface of the pipe 1. Then, while the frame 4 is moving to the left due to the rotation of the pipe 1, the heating devices 51, 51 on the left side sequentially heat the rotating pipe 1 sufficiently to the heat shrinkage temperature of the heat shrinkable tape 7. Then, by supplying the heat-shrinkable tape 7 to the outer surface of the heated pipe 1 under constant tension as described above from the tape supply device 61, the first
As shown in the figure, a heat-shrinkable tape 7 is wound around the pipe 1 in a spiral manner.

When the frame 4 moves to above the dummy pipe 81,
The winding of the heat-shrinkable tape 7 is completed, and at this time, the heat-shrinkable tape 7 is wrapped around the left end of the pipe 1 as described above.

Next, after stopping the heating devices 51, 51 and cutting the supplied heat-shrinkable tape 7, the pipe 1 is cooled, and the heat-shrinkable tape 7 wrapped around the pipe 1 is wrapped around both ends of the pipe 1. Cut back at the point. In this case, pipe 1
may be cooled by natural cooling, but pipe 1
While rotating, the pipe 1 is externally cooled by a shower from the outside, and the pipe chuck/pipe rotation drive part 2 and the pipe end support part 3 are
This can also be achieved by providing a rotary joint in the pipe 1 and injecting water into the pipe 1 for internal cooling.

After completing these operations, rotate the handle 85 to move the cart 31 backward to the left, pull out the dummy pipe 81 from the pipe 1, remove the other end of the pipe from the scroll chuck 21, and remove the hand While removing the pipe 1 wrapped with the heat-shrinkable tape 7 using a lifter or the like, the pipe 1 to be newly wrapped with the heat-shrinkable tape 7 is
As shown in the figure, the toggle clamps 53, 53, 53 of the frame 4 are suspended and then stopped on the left side.
53 to move the turning rollers 52, 52, 52, 52 to the pipe 1 as shown by the two-dot chain line in FIG.
At the same time, the lower frame 6 is removed from the rail 8.
2, 82 in a movable manner, and further move the frame 4 to the right along the rails 82, 82, for example manually, to return the frame 4 to the tape wrapping start position at the right end of the pipe 1, Prepare for the next tape wrapping.

As mentioned above, the apparatus for wrapping a heat-shrinkable tape around the outside surface of a pipe of the present invention uses a heat-shrinkable tape and wraps the heat-shrinkable tape onto the outside surface of a heated pipe. It is possible to provide a pipe in which the heat-shrinkable tape is tightly coated on the outer surface of the pipe without entrapping air, thereby achieving a reliable anti-corrosion effect, by simply rotating the pipe in a fixed position. Since the heating device and tape supply device can be moved in the axial direction of the pipe, the heat-shrinkable tape can be easily wrapped around the pipe without taking up space, and the configuration is simple. This, combined with good work efficiency, has great effects.

[Brief explanation of drawings]

Fig. 1 is a schematic front view showing how an embodiment of the present invention is used, Fig. 2 is a front view of an embodiment of the present invention, and Fig. 3 shows how a turning roller is brought into contact with a pipe. A schematic plan view, FIG. 4 is a side view of one embodiment of the invention. 1... Pipe, 4... Frame, 51... Heating device, 52
...Turning roller, 61...Tape supply device.

Claims (1)

[Claims] 1. A frame rotatably equipped with a plurality of turning rollers is provided on a pipe that rotates in a fixed position, and each of the turning rollers is brought into rolling contact with the upper part of the pipe, and the axis of the turning roller is aligned in the axial direction of the pipe. a heating device for suspending the frame on the pipe via the turning roller while tilting the frame at a desired angle with respect to the frame; and a heating device for heating the outer surface of the pipe on the frame;
A tape supply device for supplying a heat-shrinkable tape is provided on the outer surface of the pipe, and as the pipe rotates, the heating device and the tape supply device are moved in the axial direction of the pipe to heat the pipe. A device for wrapping a heat-shrinkable tape around an outer surface of a pipe, wherein the heat-shrinkable tape can be continuously wrapped around the outer surface of the pipe.