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WO1989005723A1 - Machine de formage de conduites - Google Patents

Machine de formage de conduites Download PDF

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Publication number
WO1989005723A1
WO1989005723A1 PCT/JP1988/001258 JP8801258W WO8905723A1 WO 1989005723 A1 WO1989005723 A1 WO 1989005723A1 JP 8801258 W JP8801258 W JP 8801258W WO 8905723 A1 WO8905723 A1 WO 8905723A1
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WO
WIPO (PCT)
Prior art keywords
rollers
pair
driving
pipe
strips
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP1988/001258
Other languages
English (en)
Inventor
Shigeki Fujii
Yasuo Fujiki
Minoru Yasuhara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sekisui Chemical Co Ltd
Original Assignee
Sekisui Chemical Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sekisui Chemical Co Ltd filed Critical Sekisui Chemical Co Ltd
Publication of WO1989005723A1 publication Critical patent/WO1989005723A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/56—Winding and joining, e.g. winding spirally
    • B29C53/58—Winding and joining, e.g. winding spirally helically
    • B29C53/78—Winding and joining, e.g. winding spirally helically using profiled sheets or strips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/80—Component parts, details or accessories; Auxiliary operations
    • B29C53/82—Cores or mandrels
    • B29C53/821—Mandrels especially adapted for winding and joining
    • B29C53/825—Mandrels especially adapted for winding and joining for continuous winding
    • B29C53/827—Mandrels especially adapted for winding and joining for continuous winding formed by several elements rotating about their own axes

Definitions

  • the invention relates to a pipe-forming machine for forming long helical pipes with a fixed diameter by continuously winding strips made of synthetic resin or the like, into a helical shape.
  • Japanese Patent Publication No. 62-13170 discloses this type of pipe-forming machine, in which a plurality of rollers convey the strips while regulating the outer diameter of helical pipes to be formed from the strips. By use of this machine, it is also possible to obtain helical pipes with different diameters by changing the speed of conveying the helical pipes formed from the strips and the speed of conveying the strips to be wound into a helical shape.
  • Japanese Laid-Open Patent Application No. 62-20987 also discloses a pipe-forming machine of the type mentioned above in which the strips, being conveyed along the inner faces of the buried pipes, are wound into a helical shape to form helical pipes with a regulated outer diameter.
  • these pipe-forming machines are designed so that the outer diameter of the helical pipes can be regulated while the strips are being wound into a helical shape.
  • stress in the opposite direction to the flow of conveyance is applied to the strips while helical pipes are continuously formed from strips, the strips can be forced out from between the rollers.
  • Such a stress is liable to bear on the strips while long helical pipes are being manufactured, so that it is not easy to form long helical pipes with a fixed diameter.
  • Japanese Patent Publication No. 51-13503 discloses a machine for manufacturing helical hoses in which a soft material extruded from an extruding die is wound into a helical shape in an overlapping way by a plurality of rollers. In the process, the rollers rotate while being kept in contact with the inner surfaces of the helical pipes being formed.
  • the pipe-forming machine for forming helical pipes by winding strips into a helical shape of the invention comprises a plurality of following rollers which are rotatable and arranged at a fixed helical angle on the circular area of a virtual cylinder; at least one of first and second pairs of driving rollers which hold and convey the strips therebetween in such a manner that the following rollers rotate while being kept in contact with the inner surfaces of the strips; and a pair of tension rollers which hold the strips therebetween so that the strips can be conveyed to the following rollers and which cooperate with the driving rollers to keep the strips in tension in such a manner that the following rollers rotate while being kept in contact with the inner surfaces of the strips.
  • one driving roller forms the first pair
  • one driving pair forms the second pair
  • the following rollers are arranged at a fixed helical angle on the circular area of a virtual cylinder, these driving rollers and following rollers constituting a mandrel portion.
  • the following rollers and driving rollers constituting the mandrel portion has a diameter which is greater in the middle portion than in the end portions in the direction of its axis.
  • the first pair of driving rollers are positioned so that the strip is conveyed by the following rollers constituting the lower half of the mandrel portion in such a manner that these following rollers rotate while being in contact with the inner surfaces of the strips between the pair of tension rollers and the first pair of driving rollers.
  • the second pair of driving rollers which hold and convey the strips from the first pair of driving rollers therebetween and the first pair of driving rollers are symmetrically positioned with respect to the axis of the mandrel portion.
  • the strips from the first pair of driving rollers are kept in tension by the second driving rollers so that the strips are conveyed in such a manner that these following rollers constituting the upper half of the mandrel portion rotate while being kept in contact with the inner surfaces of the strips.
  • one driving roller forming the second pair is pierced by the same axis as pierces one following roller constituting the mandrel portion.
  • the mandrel portion is detachably attached to a given frame.
  • one driving roller forming the first pair and one driving roller forming the second pair are attached to the frame so that they can come nearer to or go further away from the other driving rollers constituting the mandrel portion, respectively.
  • the driving rollers attached to the frame are respectively rotated by hydraulic motors.
  • the two driving rollers forming the first pair or second pair are rotated in reverse directions to each other by a pair of gears which mesh with the corresponding driving rollers forming the first pair or second pair when the gears approach the driving rollers.
  • the invention described herein makes possible the objectives of ( 1 ) providing a pipe-forming machine with great propulsion power with which long helical pipes with a fixed diameter can be easily manufactured; (2) providing a pip-forming machine which can be operated easily without complicated and troublesome controlling; and ( 3 ) providing a pipeforming machine with which helical pipes with different diameters can be easily manufactured.
  • Figure 1 is a partial sectional front view of a pipe-forming machine of the invention.
  • Figure 2 is a partial sectional side view of a pipe-forming machine of the invention.
  • Figure 3 is a plane view showing the principal portion of a pipe-forming machine of the invention.
  • Figure 4 is a cross-sectional view of a strip to be used in the pipe-forming machine.
  • Figure 5 is a schematic view showing the configuration of a roller for forming pipes.
  • Figure 6a is a perspective view of a roller for forming pipes and Figure 6b is a cross-sectional view of a roller for forming pipes taken along its axis.
  • a pipe-forming machine of the invention comprises a rectangular parallelepiped frame 10 and a mandrel portion 20 that is detachably mounted on the frame 10.
  • the frame 10 comprising a top plate 11, a bottom plate 12, side plates 13 and 13, and a back plate 14, has the shape of an oblong rectangular parallelepiped, the front side of which is open.
  • the mandrel portion 20 is introduced into and mounted on the frame 10 from its front side.
  • the individual side plates 13 are slidably attached to the top plate 11 and the bottom plate 12 through oblong holes by bolts, so that the individual side plates 13 can come closer to and go further away from each other.
  • the mandrel portion 20 is rotatably supported by an axis 15 and the axis 15 is supported at one end by the back plate 14 in a substantially horizontal position.
  • the mandrel portion 20 is constituted by a plurality of rollers 21 for forming pipes.
  • the forming rollers 21 comprise following rollers 21a, which are rotatably attached to roller axes 22, and a pair of driving rollers 21b, which are pierced by the roller axes 22 in a fixed way.
  • Front-side and back-side supporting plates 23 and 24 with a disk shape are spaced at a fixed interval and the roller axes 22 for supporting the following rollers 21a are bridged therebetween.
  • a connecting pipe 26 that penetrates the backside supporting plate 24, and an oblong connecting plate 25 is attached to the end portion of the connecting pipe 26 projecting from the back-side supporting plate 24.
  • Cut-out portions 24a with a shape of a circular arc are formed symmetrically on the backside supporting plate 24 with respect to the center of the disk-shaped plate 24, and the connecting plate 25 is positioned so that its end portions face the cut-out portions 24a.
  • the roller axes 22a are disposed between the individual end portions of the connecting plate 25 and the front-side supporting plate 23, the roller axes 22a are disposed.
  • One of the roller axes 22a positioned at the profile supply side pierces both the following roller 21a and the driving roller 21b. That is, the back-side half of the roller axis 22a positioned at the profile supply side pierces the following roller 21a and the front-side half of the roller axis positioned at the profile supply side pierces the driving roller 21b.
  • roller axes 22a pierces only the driving roller 21b from end to end.
  • the outer surfaces of the circular area of the driving rollers 21b are made of, for example, rigid polyurethane rubber. Both of the roller axes 22a pierce the driving rollers 21b, and the back-side ends of the roller axes 22a pierce gears 27 (See Figure 3).
  • roller axes 22 and 22a are arranged at a fixed helical angle in the circular area of a virtual cylinder.
  • the mandrel portion 20 with the above mentioned structure is attached to the inside of the frame 10 in such a manner that the supporting axis 15 is introduced into the connecting pipe 26 from the side of the connecting plate 25 and so that the driving rollers 2lb are positioned on the edge portions of a virtual plane within the mandrel 20.
  • the connecting plate 25 is brought onto the back-side plate 14 of the frame 10
  • the supporting axis 15 penetrates the connecting pipe 26 and then a stopper 15a is attached to the tip of the supporting axis 15, so that the whole mandrel portion 20 is fixed to the supporting axis 15.
  • strips 40 made of synthetic resin are wound around all the forming rollers 21 of the mandrel portion 20 to form a helical shape, in such a manner that the forming rollers 21 rotate while being kept in contact with the inner surfaces of the strips.
  • the two driving rollers 16a that form pairs with the two driving rollers 21b constituting the mandrel portion 20 are attached to the two side plates 13.
  • the individual driving rollers 16a are pierced by and fixed to the corresponding roller axes 16b disposed within rectangular parallelepiped housings 17a.
  • Each of the housings 17a is positioned so as to be in parallel with its corresponding driving roller 16a.
  • a plurality of circular fins 16c projecting in the radial direction are disposed at fixed intervals. As described below, the fins 16c are to be fit into the grooves between projections 42 formed on the back of the strips 40.
  • the outer surfaces of the circular areas of the driving rollers 16a positioned between the fins 16c are previously knurled.
  • the back-side ends of the individual roller axes 16b are connected to the output shafts of hydraulic motors 16d supported by the housings 17a, and by the operation of the hydraulic motors 16d, the driving rollers 16a are made to rotate. Between the hydraulic motors 16d and driving rollers 16a, gears 16e are pierced by the roller axes 16b. As mentioned above, the driving rollers 16a form pairs with the driving rollers 21b constituting the mandrel portion 20, and the gears 16e pierced by the same axes as pierce the driving rollers 16a are designed to mesh with the gears 27 pierced by the same axes as pierce the driving rollers 21b.
  • the bottom faces of the housings 17a are attached to the lower end portion of the supporting plates 17b, which are disposed on the inner surfaces of the individual side plates 13.
  • the housings 17a can be shifted over a virtual plane at right angles to the supporting plates 17b.
  • the upper faces of the housings 17a are attached to piston rods 17e of hydraulic cylinders 17d by means of connectors 17c.
  • the hydraulic cylinders 17d are supported by the supporting plates 17b so that the piston rods 17e extend in the direction of the mandrel portion 20.
  • the housings 17a shift around the respective portions at which the housings 17a are supported by the lower end portion of the supporting plates 17b and come nearer to the mandrel portion 20 disposed within the frame 10.
  • the piston rods 17e retract, the housings 17a move further away from the mandrel portion 20.
  • the driving rollers 16a attached to the housings 17a are brought nearer to the corresponding driving rollers 21b of the mandrel portion 20, so that the strip 40 is held between a pair of driving rollers consisting of the driving rollers 16a and 21b.
  • the gears 16e pierced by the roller axes 16b come to mesh with the gears 27 pierced by the roller axes 22a, so that the driving rollers 16a disposed within the frame 10 are rotated by the hydraulic motors 16d, giving rise to the rotation of the driving rollers 21b at the side of the mandrel portion 20 and the conveyance of the strips 40.
  • the strips 40 being held between the driving rollers 16a and 21b, are conveyed in such a manner that the following rollers 21a rotate while being kept in contact with the inner surfaces of the strips 40.
  • the supporting plates 17b for supporting the hydraulic cylinders 17d and the housings 17a are attached to the side plates 13 so that the supporting plates can be shifted over the side plates 13, and consequently, the driving rollers 16a supported by the housings 17a are made to slant by the shifting of the supporting plate 17b.
  • the driving roller 16a can be positioned in parallel to the driving roller 21b disposed at a fixed helical angle in the mandrel portion 20, after the shift of the supporting plate 17b.
  • the upper end portion of one of the supporting plates 17b is bent toward the inside of the frame 10, and a supporter 17f that penetrates the upper plate 11 of the frame 10 is attached to the bent portion of the supporting plate 17b.
  • the supporter 17f supports a casing 18a, in which a driving tension roller 18b and a following tension roller 18c are disposed.
  • the driving tension roller 18b is held in a position parallel to and above the driving roller 16a attached to the lower portion of the supporting plate 17b for supporting the tension roller 18b, and the following tension roller 18c is rotatably held in a position parallel to the driving tension roller 18b.
  • the driving tension roller 18b is connected to the output shaft of the hydraulic motor 18d supported by the casing 18a, to be rotated by the operation of the hydraulic motor 18d.
  • the following tension roller 18c is supported by the hydraulic cylinder 18f held by the casing 18a, so that the following tension roller 18c can come nearer to and go further away from the driving tension roller 18b.
  • the strips 40 made of synthetic resin are conveyed between the pair of tension rollers.
  • the strips 40 are held between the pair of tension rollers and then sent downward to the gap between the driving roller 16a and the following roller 21a, which are positioned below the pair of tension rollers.
  • circular fins 18g projecting in the radial direction are disposed at fixed intervals. As described below, the fins 18g are to be fit into the grooves between the projections 42 formed on the back of the strips 40.
  • the outer surfaces of the driving tension roller 18b between the fins 18g are previously knurled.
  • an encoder 19a for detecting the rotation of the driving tension roller 18b.
  • the rotation of the driving tension roller 18b is transmitted to the encoder 19a by means of a pair of sprockets 19b and 19c and a chain 19d round the sprockets 19b and 19c.
  • the pipe-forming machine of the invention forms helical pipes from the strips 40 with the crosssectional structure shown in Figure 4, for example,
  • the strip 40 has a sheet portion 41 with a smooth surface, and there are a plurality of projections 42, 42, ... on the back of the sheet portion 41 at fixed intervals, lined up in the direction of the width of the strip.
  • Each projection 42 has a T-shaped crosssection.
  • meshing projections 43 At one edge portion in the direction of the width of the surface of the sheet portion 41, there are meshing projections 43 that have a ball-shaped tip, which are arranged in parallel with the other projections 42.
  • stoppers 42a that bend toward the meshing projections 43 are provided.
  • the other edge portion in the direction of the width of the sheet portion 41 is arranged so that an indentation 44 that meshes with one edge portion 41a of the sheet portion 41 with the meshing projections 43 can be formed, and thus placed in an outward position with respect to the surface of the sheet portion 41 by the thickness of the sheet portion 41.
  • This portion is formed with a meshing groove 45 that is curved and protrudes outwardly so that the meshing projection 43 can mesh with the meshing groove 45.
  • the curved area formed by this meshing groove 45 has a projection 45a that projects outwardly and that is T-shaped in crosssection.
  • On the edge in the direction of the width of the sheet portion 41 with the meshing groove 45 there is formed a rib 46 that extends slantingly outwards.
  • the rib 46 is formed so that its top will engage with the curved stopping portion 42a of the projection 42 that is adjacent to the meshing projection 43 when the adjacent meshing projection 43 and the meshing groove 45 are fit together by winding of the said strip 40 into a helical shape.
  • an adhesive agent is applied to the inner surface of the meshing groove 45 of the said strip 40.
  • inner helical pipes with which buried pipes are to be rehabilitated are formed as follows. First, the mandrel portion 20 with an outer diameter corresponding to the diameter of the helical pipe to be manufactured is attached to the frame 10 on the ground. In the mandrel portion 20, the forming pipes are arranged at a fixed helical angle. Then, the supporting plates 17b to which the driving rollers 16a attached to the frame 10 are attached are shifted over the side plates 13 to a position in which the driving rollers 16a are in parallel with the corresponding driving rollers 21b constituting the mandrel portion 20, and then fixed. The pair of tension rollers 18b and 18c attached to one supporting plate 17b are slanted with the shifting of the supporting plate 17b, to be in parallel with the driving roller 16a positioned below.
  • the following tension roller 18c is taken further away from the driving tension roller 18b by control of the hydraulic cylinder 18f, and the driving rollers 16a within the frame 10 are also taken further away from the corresponding driving rollers 21b constituting the mandrel portion 20 by control of the hydraulic cylinders 17d.
  • one tip of the strip 40 of synthetic resin to be formed into helical pipes is inserted from above through the gap between the pair of tension rollers 18b and 18c, which are separated from each other, and the pair of tension rollers 18b and 18c are again brought closer to each other by control of the hydraulic cylinder 18f, followed by the operation of the hydraulic motor 18d to rotate the driving tension roller 18b.
  • the strip 40 is guided to the gap between the driving roller 16a and the following roller 21a positioned below the pair of tension rollers 18b and 18c while being held between the pair of tension rollers 18b and 18c, which are separated from each other.
  • the driving roller 16a is brought nearer to the following roller 21a and the driving roller 21b by control of the hydraulic cylinder 17d, so that the gear 16e pierced by the driving roller 16a comes to mesh with the gear 27 pierced by the roller axis 22a and the rotatory driving force of the driving roller 16a driven by the hydraulic motor 16d is transmitted to the roller axis 22a, giving rise to the rotation or the driving roller 21b.
  • the strip 40 is conveyed while being held between the driving roller 16a and the following roller 21a.
  • the strip 40 is guided by hand to be put round a plurality of pipe-forming rollers 21 (driving rollers 21a) constituting the lower half of the mandrel portion 20, and then conveyed to the other pair of driving rollers 16a and 21b.
  • driving rollers 21a driving rollers 21a
  • the hydraulic cylinder 17d is controlled so that the pair of driving rollers 16a and 21b come nearer to each other.
  • the gear (not shown) pierced by the driving roller axis 16b comes to mesh with the gear (not shown) pierced by the roller axis 22a, so that the rotatory driving force of the driving roller 16a being driven by the hydraulic motor (not shown) is transmitted to the roller axis 22a, giving rise to the rotation of the driving roller 21b.
  • the strip 40 put round the pipe-forming rollers 21 (following rollers 21a) constituting the lower half of the mandrel portion 20 is conveyed while being held between the pair of driving rollers 16a and 21b.
  • the strip 40 is then put round a plurality of pipe-forming rollers 21 (following rollers 21a) constituting the upper half of the mandrel portion 20, to be conveyed to the first pair of driving rollers 16a and 21b, which are positioned below the pair of tension rollers 18b and 18c and which are holding the strip 40 therebetween.
  • the meshing project 43 of the rolled portion of the strip 40 is fit into the meshing groove 45 of the newly fed portion of the strip 40, and the foregoing process is repeated to form helical pipes by continuously rotating the driving rollers.
  • the hydraulic motors 16d and 18d are stopped and then the whole pipe-forming machine is installed inside a manhole to which the end portion of the buried pipe to be rehabilitated is connected.
  • the pair of tension rollers 18b and 18c are put apart by controlling the hydraulic cylinder 18f, and the supporter 17f attached to the casing 18a is detached from the supporting plate 17b, so that the frame 10 can be put into the manhole with one of its side plates facing downward, and then the pipe-forming machine can be reconstructed inside the manhole.
  • the pipe-forming machine is set at a predetermined position and the hydraulic motors 16d and 18d are again operated, so that the strip 40 paid out from a coil on the ground is wound into a helical shape and then issued directly into the buried pipe to be rehabilitated from the front side of the frame 10 as a helical pipe.
  • the first pair of driving rollers 16a and 21b and the driving roller 16a disposed below the tension rollers 18b and 18c are symmetrically positioned with respect to the supporting axis 15, and the velocity of conveying the strip 40 by the first pair of driving rollers is set to be higher than that of conveying the strip 40 by the pair of tension rollers 18b and 18c. Accordingly, the strip 40 extending from the pair of tension rollers 18b and 18c to the first pair of driving rollers 16a and 21b is in tension, so that the strip 40 is forcibly pressed to the following rollers positioned between the pair of tension rollers 18b and 18c and the first pair of driving rollers 16a and 21b, to be curved into a circular arc without fail.
  • the second pair of driving rollers consists of the driving roller 16a disposed below the pair of tension rollers 18b and 18c and the driving roller 21b constituting the mandrel portion 20, and the velocity of conveying the strip 40 by the second pair of driving rollers 16a and 21b is set to be higher than that of conveying the strip 40 by the first pair of driving rollers 16a and 21b. Accordingly, the strip 40 extending from the first pair of driving rollers 16a and 21b to the second pair of driving rollers 16a and 21b is in tension, so that the strip 40 is forcibly pressed to the following rollers 21a which are positioned between the first and second pairs of driving rollers and which constitute the upper half of the mandrel portion 20.
  • the correlation among the velocities of conveying the strip 40 by the pair of tension rollers 18b and 18c, by the second pair of driving rollers 16a and 21b, and by the first pair of driving rollers 16a and 21b is described.
  • the velocities of conveying the strip 40 by the three pairs of rollers are different from each other, as shown above Consequently, the strip 40 is in tension resulting from the differences in the conveyance velocities while being conveyed.
  • the driving rollers have an equal diameter, the rotation frequencies of the individual hydraulic motors functioning as power sources are set at different ratios.
  • the rotation frequency of the hydraulic motor 16d driving the first pair of driving rollers 16a and 21b is set at 10
  • the rotation frequency of the hydraulic motor (not shown) driving the second pair of driving rollers 16a and 21b and the rotation frequency of the hydraulic, motor 18d driving the driving tension rollers 18b are preferably set at 9 and 4 to 5, respectively, so that the strip 40 is at the tension of the desired strength while being conveyed and forcibly put around the mandrel portion 20 to form a helical pipe with a fixed diameter.
  • a second speed system with which the formation of pipes can be conducted at either high speed or low speed or else a multiple-speed system for forming pipes is applied to the pipe-forming machine of the invention.
  • the rotation frequencies of the motors are maintained at a fixed ratio, as shown above.
  • the encoder 19a is used to detect and display the rotation of the driving tension roller 18b, and the worker recognizes the actual speed of pipe-formation according to the display of the encoder 19a.
  • the pair of driving rollers and the pair of tension rollers of the pipe-forming machine of the invention are not limited to the aforementioned example, but various other embodiments are applicable thereto, as follows.
  • the portion of the strip 40 extending from the pair of tension rollers 18b and 18c to the pair of driving rollers 16a and 21b positioned below the pair of tension rollers 18b and 18c around the mandrel portion 20 is in tension, so that the whole strip 40 is forcibly pressed to all the following rollers constituting the mandrel portion at once, which is different from the above mentioned case in which the strip 40 is first pressed to the following rollers constituting the lower half of the mandrel portion and then pressed to the following rollers constituting the upper half of the mandrel portion, in the presence of the first pair of driving rollers.
  • the pipe-forming rollers 21 consisting of the following rollers 21a and driving rollers 21b of the mandrel portion 20 are arranged at a fixed helical angle on the circular area of a virtual cylinder.
  • the pipe-forming machine of the invention uses the following rollers 21a and the driving rollers 21b in which the circular section is greater in the middle portion than in either end portions.
  • the configuration of the pipe-forming rollers 21 is determined by the diameter of helical pipes to be formed and the width of the strip.
  • Figure 5 is a view schematically showing the configuration of the pipe-forming rollers 21, in which the x axis is the axis of the pipe-forming rollers 21 and the y axis is the line at right angles to the x axis through the center of the pipe-forming rollers 21.
  • the pipeforming roller 21 is symmetrical with respect to the y axis, so that its diameter is the greatest at the y axis and becomes smaller with the distance from the y axis toward both ends of the pipe-forming roller 21.
  • the difference in length between the diameter of the pipe-forming roller at a certain point on the x axis (shown by the y axis) and the greatest diameter of the pipe-forming roller, ⁇ y is given by the following equation.
  • D is the inner diameter of the helical pipe
  • W is the width of the strip
  • Equation 1 indicates that the outer diameter of another virtual cylinder newly constituted by the pipe-forming rollers is uniform in the direction of its axis even when the pipe-forming rollers are arranged at a given helical angle on the circular area of a virtual cylinder, provided that the pipe-forming rollers 21 have diameters that are the greatest in the middle portion thereof and that become smaller with distance from the middle portion toward the end portions.
  • Figure 6b shows a cross-section taken along the axis of the pipe-forming roller 21, in which the configuration of the outer. surface of the pipe-forming roller 21 is substantially an circular arc with diameter R.
  • the diameter R is obtained from the following equations.
  • D is the outer diameter of the virtual cylinder 30 constituted by the pipeforming roller 21 (the inner diameter of the helical pipe to be manufactured);
  • B is the length of the cylinder 30;
  • ⁇ is the helical angle of the pipe-forming roller 21 (the angle made by a line on the circular area of the cylinder 30 parallel to its axis and a line through the contact point of pipoforming rollers 21 and the cylinder 30 parallel to the axis of the pipe-forming roller 21);
  • W is the width of the strip;
  • ⁇ is the angle of torsion of the pipeforming roller 21 (the deviation in the center of one end face from the other of the pipe-forming roller 21, shown as the central angle at one end face of the cylinder 30).
  • Equation 5 is obtained from the equations 2 to 4.
  • ⁇ y is the difference in length between the greatest diameter (in the middle portion) and the smallest diameter (at the ends) of the pipe-forming roller 21.
  • Table 1 shows the relationship among the inner diameter D of helical pipes (equal to the outer diameter of the virtual cylinder constituted by the pipe-forming rollers), the maximum max ⁇ y of the difference in length between the greatest outer diameter and the smallest outer diameter of the pipeforming roller, and the radius of the circular arc regulating the configuration of the circular area of the pipe-forming roller, at the time when the length of each of the pipe-forming roller is 280 mm and the width of a strip is 95 mm.
  • strips can be easily formed into helical pipes with a fixed diameter by use of the pipeforming machine of the invention in which a plurality of following rollers are arranged at a fixed helical angle on the circular area of a virtual cylinder and the strips are in tension to be wound around the following rollers into a helical shape in such a manner that the following rollers rotate while being kept in contact with the inner surfaces of the strips.
  • the pipe-forming machine of the invention can be easily operated, because the rotation frequencies of the driving rollers are previously set so that the strips are kept in tension, and it is not necessary to control the rotation frequencies of the driving rollers while forming pipes.
  • the mandrel portion is replaced by another mandrel portion.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Abstract

Machine servant à former des conduites hélicodaïles en enroulant des bandes (40) en une forme hélicoïdale, comprenant un ensemble de rouleaux suiveurs rotatifs (21a) qui sont montés à un angle hélicoïdal fixe sur la surface circulaire d'un cylindre virtuel; au moins une paire parmi une première et une deuxième paires de rouleaux d'entraînement (16a, 21b) qui maintiennent et guident les bandes entre eux, de sorte que les rouleaux suiveurs tournent tout en restant en contact avec les surfaces internes des bandes; et une paire de rouleaux de tension (18b, 18c) qui maintiennent les bandes entre eux, de sorte qu'elles puissent être transportées jusqu'aux rouleaux suiveurs et qui agissent de concert avec les rouleaux d'entraînement pour maintenir les bandes sous tension, de sorte que les rouleaux suiveurs tournent tout en restant en contact avec les surfaces internes des bandes.
PCT/JP1988/001258 1987-12-14 1988-12-13 Machine de formage de conduites Ceased WO1989005723A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP31646687A JPH0737064B2 (ja) 1987-12-14 1987-12-14 製管機
JP62/316466 1987-12-14

Publications (1)

Publication Number Publication Date
WO1989005723A1 true WO1989005723A1 (fr) 1989-06-29

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ID=18077409

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1988/001258 Ceased WO1989005723A1 (fr) 1987-12-14 1988-12-13 Machine de formage de conduites

Country Status (4)

Country Link
JP (1) JPH0737064B2 (fr)
AU (1) AU2795489A (fr)
ES (1) ES2012898A6 (fr)
WO (1) WO1989005723A1 (fr)

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EP0381257A3 (fr) * 1989-01-05 1991-07-03 ERSAG Systeme AG Dispositif d'enroulement pour la fabrication de tubes
TR25262A (tr) * 1989-04-14 1993-01-01 Ciba Geigy Ag Sulfenillenmis karbamik asit esterleri
BE1004786A3 (fr) * 1990-11-22 1993-01-26 Toyo Kagaku Kk Appareil pour fabriquer un tube ondule.
WO2000050219A1 (fr) * 1999-02-23 2000-08-31 The Lamson & Sessions Co. Appareil de fabrication de conduits a tambour d'enroulement a plusieurs diametres
US6250908B1 (en) 1999-02-23 2001-06-26 The Lamson & Sessions Co. Conduit-making apparatus with a variable diameter winding drum
WO2017144770A1 (fr) * 2016-02-23 2017-08-31 Plastic Pipe Mobile Ou Appareil et procédé pour déplacer un tube en plastique dans son procédé de production

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JP2807914B2 (ja) * 1990-02-22 1998-10-08 東洋化学株式会社 合成樹脂製管の製造方法および装置
FI95219C (sv) * 1992-04-30 1996-01-10 Kwh Pipe Ab Oy Svetsningsförfarande vid framställning av spirallindat rör och svetshuvud för utförande av förfarandet
TW226003B (fr) * 1992-11-13 1994-07-01 Toyo Kagaku Kk
JP4767155B2 (ja) * 2006-11-26 2011-09-07 足立建設工業株式会社 管渠におけるライニング用管状体の製管装置及びその製管方法
JP2010023350A (ja) * 2008-07-18 2010-02-04 Sekisui Chem Co Ltd 製管装置およびこの製管装置を用いた管状体の製管方法
JP5358156B2 (ja) * 2008-10-27 2013-12-04 積水化学工業株式会社 更生管の製管装置および更生管の製管方法
EP2674280A4 (fr) 2011-02-07 2016-10-12 Sekisui Chemical Co Ltd Appareil de fabrication de tube et procédé de fabrication de tube
JP5887195B2 (ja) * 2012-04-27 2016-03-16 積水化学工業株式会社 更生管の製管方法
JP6696872B2 (ja) * 2016-09-30 2020-05-20 積水化学工業株式会社 螺旋管の製管方法
JP7684653B2 (ja) * 2021-08-30 2025-05-28 株式会社クボタケミックス 製管機および製管方法
JP7613691B2 (ja) * 2021-08-30 2025-01-15 株式会社クボタケミックス 製管機および製管方法
JP7684654B2 (ja) * 2021-08-30 2025-05-28 株式会社クボタケミックス 製管機および製管方法
JP7656864B2 (ja) * 2021-08-30 2025-04-04 株式会社クボタケミックス 製管機および製管方法

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US4337564A (en) * 1978-10-06 1982-07-06 Rib Loc Hong Kong Limited Machine and method for forming tubes from a strip
WO1983004196A1 (fr) * 1982-05-27 1983-12-08 Rib Loc Hong Kong Limited Machine d'enroulement helicoidal de conduites
WO1987005677A1 (fr) * 1986-03-19 1987-09-24 Rib Loc Australia Pty. Ltd. Procede et moyens de garnissage et de recouvrement de conduites

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DE2435326A1 (de) * 1973-08-09 1975-02-20 Creators Ltd Einstellbare formeinrichtung
US4337564A (en) * 1978-10-06 1982-07-06 Rib Loc Hong Kong Limited Machine and method for forming tubes from a strip
WO1983004196A1 (fr) * 1982-05-27 1983-12-08 Rib Loc Hong Kong Limited Machine d'enroulement helicoidal de conduites
WO1987005677A1 (fr) * 1986-03-19 1987-09-24 Rib Loc Australia Pty. Ltd. Procede et moyens de garnissage et de recouvrement de conduites

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0381257A3 (fr) * 1989-01-05 1991-07-03 ERSAG Systeme AG Dispositif d'enroulement pour la fabrication de tubes
EP0377227A3 (fr) * 1989-01-05 1991-07-03 Ametex Ag Dispositif d'enroulement pour la fabrication de tubes
TR25262A (tr) * 1989-04-14 1993-01-01 Ciba Geigy Ag Sulfenillenmis karbamik asit esterleri
BE1004786A3 (fr) * 1990-11-22 1993-01-26 Toyo Kagaku Kk Appareil pour fabriquer un tube ondule.
ES2051175A2 (es) * 1990-11-22 1994-06-01 Toyo Kagaku Kk Aparato para fabricar continuamente un tubo ondulado.
WO2000050219A1 (fr) * 1999-02-23 2000-08-31 The Lamson & Sessions Co. Appareil de fabrication de conduits a tambour d'enroulement a plusieurs diametres
US6209607B1 (en) 1999-02-23 2001-04-03 The Lamson & Sessions Co. Conduit-making apparatus with a multiple diameter winding drum
US6250908B1 (en) 1999-02-23 2001-06-26 The Lamson & Sessions Co. Conduit-making apparatus with a variable diameter winding drum
WO2017144770A1 (fr) * 2016-02-23 2017-08-31 Plastic Pipe Mobile Ou Appareil et procédé pour déplacer un tube en plastique dans son procédé de production

Also Published As

Publication number Publication date
JPH0737064B2 (ja) 1995-04-26
AU2795489A (en) 1989-07-19
ES2012898A6 (es) 1990-04-16
JPH01156041A (ja) 1989-06-19

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