JPH0729370B2 - Pipe making machine - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a pipe manufacturing machine for spirally winding a band made of synthetic resin to manufacture a spiral tube having a predetermined diameter.

(Prior Art) When manufacturing a tube made of synthetic resin, a strip is wound in a spiral shape, and adjacent widthwise side portions of the wound strip are fitted or bonded together, A pipe making machine for producing a spiral pipe is disclosed in, for example, Japanese Patent Application Laid-Open No. 55-61434. Since such a pipe making machine can form a pipe at a piping site, it does not need to transport a bulky pipe, and can be transported as a roll of a band-shaped body, which has an advantage of reducing transportation cost.

A pipe-making machine for spiral pipes has a plurality of pipe-making rollers arranged in a cylindrical shape, introduces a band-shaped body into a cylindrical space formed by each pipe-making roller, and introduces the introduced band-shaped body into each pipe It is rolled on a roller and wound in a spiral. Each pipe-making roller is arranged so as to have a predetermined spiral angle so that the strip-shaped body can be spirally wound, and the strip-shaped body is rolled so as to be orthogonal to each pipe-making roller.

BACKGROUND ART Conventionally, a pipe-making roller on which a strip-shaped body is rolled is arranged so as to be able to freely rotate. The strip-shaped body rolls into contact with each pipe-making roller by the propulsive force when being introduced into the cylindrical space formed by the pipe-making roller, and the strip-shaped body is introduced into the cylindrical space formed by each pipe-making roller. At the end, no propulsive force is obtained,
This end portion must be manually pulled out from the space formed by the tube making roller.

Further, in the case of manufacturing a spiral tube having a small diameter, since the flexural modulus of the strip becomes large, the strip is strongly pressed against the pipe-making roller, and a large friction resistance acts on the strip. Therefore, in order to wind the band-shaped body in a spiral shape having a small diameter, it is necessary to give a strong propulsive force to the band-shaped body.

Further, in such a pipe-making machine, a drive roller is disposed so as to face one pipe-making roller in a cylindrical space formed by each pipe-making roller, and the drive roller and the pipe-making roller facing each other form a strip shape. A method of holding the body to give a propulsive force to the belt-shaped body is also considered. In such a case, if the pipe making roller has a predetermined spiral angle, the drive roller also has the same spiral angle.
The drive roller may come into contact with the adjacent pipe-making rollers. In particular, when manufacturing a small-diameter spiral tube, it is necessary to give a strong propulsive force to the belt-shaped body, the drive roller must be lengthened, and there is a high possibility that the adjacent tube-making rollers will come into contact with each other.

(Problems to be Solved by the Invention) The present invention is to solve the above-mentioned conventional problems, and an object thereof is to rotate each pipe-making roller that forms a cylindrical space,
An object of the present invention is to provide a pipe manufacturing machine that can easily manufacture a spiral pipe having a small diameter by applying a propulsive force to each rolling member by the pipe manufacturing rollers. Another object of the present invention is to provide a pipe-making machine that can reliably pull out the end portion of the strip-shaped body from the space formed by the pipe-making rollers.

(Means for Solving Problems) A pipe manufacturing machine according to the present invention includes a plurality of pipe-making rollers arranged in a cylindrical shape having a predetermined spiral angle, a belt, and a driving pulley for moving the belt in an orbit. And a tension pulley for applying a tension to the belt, the belt being wound around a driving pulley, a tension pulley, and all the pipe-making rollers, and each pipe-making roller is rotated by the orbital movement of the belt. The belt-shaped bodies having engaging portions on both sides of the circle are introduced into the cylindrical space formed by the respective pipe-making rollers by rotating in synchronization with each other, and the introduced band-shaped bodies are brought into rolling contact with the respective pipe-making rollers. The spiral pipe is manufactured by spirally winding and engaging the adjacent engaging portions with each other, thereby achieving the above object.

(Example) Hereinafter, the present invention will be described with reference to Examples.

INDUSTRIAL APPLICABILITY The pipe manufacturing machine of the present invention, for example, continuously spirally winds a synthetic resin strip, and engages adjacent side portions in the width direction of the spirally wound strip. By doing so, the spiral tube is continuously manufactured.

The manufacturing machine is, for example, as shown in FIG. 1 and FIG.
It has a rectangular parallelepiped frame body 10 and a pair of annular frames 21 and 22. Square frames 11 and 12 are formed on opposite surfaces of the frame body 10, and four brackets 13, 13, ... And 14, 14, at the corners of the square frames 11 and 12, respectively.
... is provided. Each bracket 13 and 14 is provided with an arcuate elongated hole 13a and 14a, respectively.

The annular frames 21 and 22 are arranged on the inner side surfaces of the square frames 11 and 12 concentrically with the square frames 11 and 12. Pins 23, 23, ... And 24, 24, ... Are planted in four equal parts on the outer surface of each annular frame 21 and 22, respectively, and each pin 23 and 24 is the length of each bracket 13 and 14. The holes 13a and 14a are slidably engaged with the holes 13a and 14a, respectively, and are prevented from coming off. Therefore, each annular frame 21 and 22 is
Each square frame 11 and 12 is attached to the frame body 10 so as to be rotatable by the length of the long holes 13a and 14a. The annular frames 21 and 22 are rotated by handles 43 and 44 attached to the frame body 10, respectively.

In each of the annular frames 21 and 22, for example, 24 support rods 25, 25, ... And 26, 26 ,. Each support rod 25 and 26 includes an annular frame 21 and 22.
, Respectively, are mounted so as to be movable in the radial direction.

That is, 24 cylindrical connecting pipes 21a are fixed to one annular frame 21 in a radial pattern at 24 equal intervals.
Each support rod 25 is slidably fitted inside. A thread groove is formed on the outer peripheral surface of each support rod 25, and a pair of nuts 21b and 21b are screwed into the thread groove. Then, the support rod 25 is fixed by tightening the nuts 21b and 21b so as to firmly engage with the respective end portions of the connecting pipe 21a. Therefore, when the nuts 21b and 21b are pivotally operated to release the engagement with the connecting pipe 21a, the indicator rod 25 becomes movable in the radial direction of the annular frame 21. A connecting pipe 22a and a nut 22b are also arranged on the other annular frame 22, respectively, and each support rod 26 is moved in the radial direction with the same structure.

The support rods 25 and 26 are arranged so as to face each other when the annular frames 21 and 22 are located at the starting points of their rotation ranges. Universal bearings 27 are attached to the end portions on the center side of the support rods 25 arranged on one of the annular frames 21, respectively. The universal bearing 27 supports the shaft so that the shaft can rotate even if the shaft is tilted, and for example, a spherical bearing is used. Similar free bearings 28 are also arranged at the ends on the center side of the support rods 26 arranged on the other annular frame 22.

One end of a roller shaft 31 that supports the pipe-making rollers 30, 30, ... Is fitted to each of the universal bearings 27. The fitted end of the roller shaft 31 is restricted from moving in the axial direction. The other end of each roller shaft 31 is fitted into a universal bearing 28 arranged so as to face each universal bearing 27. Therefore,
The tube-making rollers 30 are arranged in a cylindrical shape. Universal bearing 28
The roller shaft 31 fitted in is movable in the axial direction with respect to the universal bearing 28.

The annular frames 21 and 22 are rotated with respect to the square frames 11 and 12 by the rotation of the handles 43 and 44, and the spiral angles of the tube-making rollers 30, 30, ... Are changed.

One end of the introduction guide 50 is attached to the roller shaft 31 of the pipe making roller 30 located at the lowermost side. The introduction guide 50
Is arranged so that its longitudinal direction is orthogonal to the pipe-making rollers 30, and extends outward from the cylindrical space formed by each pipe-making roller 30, and is strip-shaped on the introduction guide 50. The body is transported. The introduction guide 50 is a roller shaft of the pipe making roller 30.
Since it is attached to the pipe making roller 31, even if the spiral angle of the pipe making roller 30 is changed, the pipe making roller 30 is always orthogonal to the pipe making roller 30.

An introduction roller 60 (see FIG. 1) is arranged above the tube-making roller 30 located at the lowermost side in parallel with the tube-making roller 30. The introducing roller 60 is configured to be freely rotatable, and is formed by each tube-making roller 30 by sandwiching the strip-shaped body conveyed by the introducing guide 50 with the opposing tube-making roller 30. It is introduced into the cylindrical space.

As shown in FIG. 3, a driving roller 51 and a pinch roller 52 forming a pair are arranged at the end of the introduction guide 50 extending from the lowermost pipe making roller 30. The drive roller 51 and the pinch roller 52 sandwich the strip-shaped body and
The belt-shaped body is conveyed to the introduction roller 60 by the rotational driving of the. The introducing roller 60 may be synchronously rotated with the driving roller 51 at the same speed.

An end portion of the introduction guide 50 on the side where the drive roller 51 is attached is suspended by the frame body 10 so as to be rotatable in a plane (not shown).

The drive roller 51 is rotationally driven by a hydraulic motor 53 mounted on its side. A sprocket 54 is fixed to the roller shaft 51a of the drive roller 51. Below the pinch roller 52, a pulley shaft 56a is installed in parallel with the pinch roller 52, and the driving pulley 56 is externally fitted and fixed to the pulley shaft 56a. A sprocket 57 is fixed to a position of the pulley shaft 56a opposed to the sprocket 54, and a chain 58 is wound around both the sprockets 54 and 57. Both sprockets 54 and 57 have the same diameter,
The rotation of the drive roller 51 is controlled by the drive pulley via the chain 58.
Propagated to 56. Therefore, the driving pulley 56 is a drive roller.
It rotates at the same speed as 51.

The frame body 10 is provided with a tension pulley 71 at a position opposed to the driving pulley 56 with the tube-making rollers 30 in between.
The tension pulley 71 moves so as to approach or separate from the driving pulley 56 by the rotation of the handle 72.

A single V-belt 70 is wound around the driving pulley 56, the tension pulley 71, and the pipe manufacturing rollers 30. The V-belt 70 is wound so that the back surface is in contact with the peripheral surfaces of all the pipe-making rollers 30, and each pipe-making roller 30 is rotated by the orbital movement of the V-belt 70. The V
The belt 70 is rotated by the rotation of the driving pulley 56.

The operation of the pipe manufacturing machine of the present invention having such a configuration is as follows.

When introducing the belt-shaped body, the support rods arranged on the respective annular frames 21 and 22 corresponding to the diameter of the spiral tube to be manufactured.
Move 25 and 26 radially. The radial movement of the support rods 25 and 26 of the annular frames 21 and 22 is performed by rotating the nuts 21b and 22b. Then, the diameter of the cylindrical space formed by the pipe-making roller 30 supported by the tips of the support rods 25 and 26 is equal to the outer diameter of the spiral pipe to be manufactured, and the support rods 25 and The bearings 27 and 28 at the center end of 26 are located on the concentric circles of the annular frames 21 and 22.

Then, so that each pipe-making roller 30 has a predetermined spiral angle,
The handles 43 and 44 are rotated to rotate the annular frames 21 and 22.

In this condition, rotate the drive roller 51 and
The strip is conveyed to above 50, and the strip is introduced into the cylindrical space formed by each pipe-making roller 30.

On the other hand, the rotation of the drive roller 51 is transmitted to the driving pulley 56 via the chain 58, and the rotation of the driving pulley 56 causes the V-belt 70 to rotate. The pipe-making rollers 30 on which the V-belt 70 is wound are rotated in synchronization with the orbital movement of the V-belt 70. As a result, the belt-shaped body introduced by the drive roller 51 into the cylindrical space formed by each pipe-making roller 30 is given a propulsive force by the rotation of each pipe-making roller 30, and the pipe-making rollers 30 are sequentially rolled. Contact. Then, the belt-shaped body is forcibly bent while the tube-making rollers 30 are sequentially rolled and rolled, and is spirally wound at a predetermined spiral angle formed by the tube-making rollers 30. The spirally wound band-shaped body has adjacent side portions engaged with each other to form a spiral tube having a predetermined diameter.

(Effects of the Invention) In the spiral tube of the present invention, each tube-making roller on which the belt-shaped body is in rolling contact is rotated in synchronization with the belt in this way, and a propulsive force is applied to the belt-shaped body by rotation of each tube-making roller. Therefore, the belt-like body surely advances even if it is forcibly bent by rolling contact with each pipe-making roller. Therefore, a small-diameter spiral tube can be easily manufactured. The end portion of the belt-like body is also surely advanced, and is surely led out from the cylindrical space formed by the pipe-making roller.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing an example of the pipe making machine of the present invention,
2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 is a sectional view of FIG.
It is an expanded sectional view in the III-III line. 10 …… Frame, 21,22 …… annular frame, 25,26 …… Supporting rod, 30 …… Pipe making roller, 50 …… Introduction guide, 56 …… Driving pulley, 70 …… V belt, 71 …… Tension pulley.

Claims (2)

[Claims] 1. A plurality of pipe-making rollers arranged in a cylindrical shape having a predetermined spiral angle, a belt, a driving pulley for moving the belt around, and a tension pulley for applying tension to the belt. The belt is wound around a driving pulley, a tension pulley, and all the pipe-making rollers, and the pipe-making rollers are rotated in synchronization as the belt makes a circular movement. Introducing a band-shaped body having engaging portions on both side edges into the formed cylindrical space, rolling the introduced band-shaped body to each pipe-making roller and spirally winding the adjacent band-shaped engaging portions. A pipe-making machine that engages with each other to produce a spiral pipe. 2. The rotation speed of the driving pulley is synchronized with the speed of introduction of the strip into the space.
The pipe manufacturing machine according to item.