JPH02235721A - Manufacture of spiral tube and device thereof - Google Patents

Abstract

PURPOSE:To cause the large driving horse power in manufacture to be unnecessary, while the tube to be produced is not rotated at all by a method in which while a pair of two nip rolls fixed in a posture of a twisted angle defined by the width of a bandlike sheet and the diameter of the tube, are rotated on a circle of a prescribed radium around the axis of the tube to be formed as its center, it is formed into a spiral tube. CONSTITUTION:A pair of two nip rolls 3, 3 nipping the bandlike sheet 2 continuously fed from a bobbin 1 and fixed in a posture of the twisted angle defined by the width (b) of the bandlike sheet and the diameter (d) of a tube, are rotated on a circle of a prescribed radius (r) around the axis P' of the tube P to be formed as its center. While the bandlike sheet 2 is wound in order by the rotation of planetary motion to the axis P' of the tube P, it is formed into the tube P, but the bandlike sheet 2 is twisted by the rotation of the nip rolls 3, 3 from the position of the start of winding. Then, the twist is removed by the rotation in the untwisting direction (arrow x) of the bobbin 1. The tube P is transferred into the axial direction by a pushing device 4 with the rotation of the nip rolls 3, 3, and is continuously formed into the tube.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a method for manufacturing a helical tube and an apparatus therefor. [Conventional technology] Conventionally, when old buried pipes break or leak, it is necessary to dig them up and replace them with new pipes. A pipe rehabilitation method is sometimes used in which a vertical shaft is excavated perpendicular to the pipe and a pipe is inserted into the aged pipe from this shaft. As shown in Fig. 8, this pipe rehabilitation method involves directly manufacturing a spiral pipe A in which a strip A' is wound into a tubular shape in a shaft B.
A method of sequentially inserting this into an old pipe C is known, and as an apparatus D for manufacturing this spiral pipe, for example, Japanese Patent Laid-Open No. 63
-69620 publication is known. [Problems with the prior art] However, in the above-mentioned pipe making machine, the supplied strip passes through the Nisobro roll or the forming roll E which is held in a constant position, and the pipe is manufactured while sequentially rotating the pipe A. ,
As the pipe becomes longer, the rotational horsepower increases dramatically, which not only makes manufacturing difficult, but also because the pipe A is constantly rotated and pushed in, contact wear with the inner surface of the aging pipe C occurs. The drawback was that preventive measures had to be taken at the same time. [Problems to be Solved by the Invention] In view of the above-mentioned problems, the present invention provides a method for manufacturing a helical tube that can be manufactured without rotating the tube body for manufacturing the helical tube and can be sequentially pushed in the axial direction. This was done for this purpose. [Technology that led to the solution of the problem] That is, the method and device for manufacturing a spiral tube of the present invention sandwich continuously supplied strips, and twist the tube in a twist angle position determined by the width of the strip and the diameter of the tube. A spiral tube is formed by rotating a pair of fixed nip rolls at a constant radius around the axis of the tube to be formed, and at this time, the strip is moved along the center line of the strip by one rotation of the Nisobro roll. Another invention is a method characterized by rotating a drive shaft around the shaft, a radial arm fixed to the shaft end of the drive shaft, and a side surface of the arm. a pair of nip rolls that are cantilevered at a certain twist angle with respect to the rotating shaft; and a sleeve body that is rotatably fitted onto the drive shaft in the same direction as the direction in which the nisoprol extends. , a tube-making feed roller rotatably supported around an axis perpendicular to the rotation axis, the roller being pivotally supported at the tip of an arm extending radially from the sleeve. This is a manufacturing device for spiral tubes.

〔Example〕

Next, an example of this invention will be explained. FIG. 1 is a perspective view of an apparatus for carrying out the method of the present invention;
The figure is a sectional view of another device, and Figures 3 to 6 are process diagrams for implementing the method of this invention. The method for manufacturing a spiral tube of the present invention is shown in FIG. 1, in which a strip 2 continuously supplied from a bobbin 1 etc. is sandwiched, and the spiral tube is fixed in a torsion angle position determined by the width b of the strip and the diameter d of the tube. A pair of nip rolls 3.3 are rotated at a constant radius r around the axis P of the pipe P to be formed to form the spiral pipe P. The structure is such that the belt-shaped body 2 is rotated about the center line 2' of the belt-shaped body 2 in the direction of unstitching with each rotation. In FIG. 1, IA is a frame that rotatably supports the bobbin l around the vertical axis in order to perform the mending movement of the strip body 2;
Further, 4 is a device for feeding the pipes P to be sequentially formed in the axial direction, and the illustrated example shows a case where a hydraulic cylinder piston is used. In addition to applying a pressing force from the molding side to the back of the tube, this device 4 may also be configured to pull the tube P into the tube C using a pulling device 4'' as shown in FIG. In the above, the strip 2 is attached to the axis P of the nip roll 3.3.
The tube is formed into the pipe P by being sequentially wound by the planetary rotation movement relative to the angle of the rotation angle. At this time, as shown in FIG. 4, the nip rolls 3 and 3 are
As the belt rotates, glue is applied to the strip 2. Therefore, this repair is shown in Figure 5. As shown in Figure 6, the problem is resolved by rotating the bobbin l in the untwisting direction (arrow X). In addition, as the tube is manufactured as the Nimbro roll 3.3 rotates, the tube P is fed in the axial direction by the pressing device 4.
The tube is continuously formed. Next, the helical tube manufacturing apparatus of the present invention will be explained. FIG. 7(A) is a side view of an embodiment of the present invention, and FIG. The helical tube manufacturing apparatus 10 of the present invention includes a drive shaft 1) rotated around the shaft by a motor M, and a shaft end 1) of the drive shaft A.
a radial arm 12 fixed to a radial arm 12; a pair of nip rolls 13, 13 supported on the side of the arm 12 at a fixed torsion angle with respect to the drive shaft axis P'; and this nip roll 13. A sleeve 14 is rotatably fitted onto the drive shaft 1l in the same direction as the extending direction of the sleeves 13, and arms 15 extend radially from the sleeve 14, and are pivotally supported at the tips of l5. In addition, a tube feed roller 16 is rotatable around an axis perpendicular to the drive shaft.
It consists of 16... In the above embodiment, the tube feeding rollers 16 . . . 16 may have a structure in which a belt is mounted between the two rollers 16 , 16 as shown in the figure.

[Effect]

According to this invention, the spiral tube P is formed by a nif roll that makes a planetary rotational motion, and the manufactured tube P itself does not make any rotational motion.

Furthermore, the need for mending of the strip 2 is eliminated by the rotation of the pobbin 1, allowing smooth molding. [Effect] As explained above, when manufacturing a spiral pipe, the manufactured pipe does not rotate at all, so a large drive horsepower is not required during manufacturing, and the invention is easy to implement. It also has the effect of reducing damage to the tube due to friction during insertion.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an apparatus for carrying out the method of the present invention;
The figure is a sectional view of another device, FIGS. 3 to 6 are process diagrams for carrying out the method of this invention, and FIGS. , FIG. 8 is a sectional view of a conventional example. A3I T4 (fJ γ5727 7ttrt γzm G x N Rain\\ , ,

Claims (2)

[Claims] (1) A pair of nip rolls sandwiching a continuously supplied strip and fixed in a twisting angle determined by the width of the strip and the diameter of the tube at a constant radius around the axis of the tube to be formed. A method for manufacturing a helical tube, characterized in that a helical tube is formed while rotating, and at this time, the strip is rotated in an untwisting direction about the center line of the strip along with one rotation of a nip roll. (2) A drive shaft that rotates around the shaft, a radial arm fixed to the end of the drive shaft, and a pair of nip rolls that are cantilevered on the side of the arm at a constant torsion angle with respect to the rotation shaft. a sleeve body rotatably fitted on the drive shaft in the same direction as the extending direction of the nip roll; and a sleeve body rotatably fitted on the drive shaft in the same direction as the extending direction of the nip roll; 1. A spiral tube manufacturing device comprising a tube-making feed roller that can be rotated around an axis perpendicular to the axis.