JPH02134484A - Corrugated pipe, pressing member, and core die - Google Patents

Abstract

PURPOSE:To obtain uniform spiral pitch by supplying a flexible reinforcement between a spiral pipe, which is leadingly wound on a mandrel, and a band to be extruded, winding them together, winding an endless belt a plurality of turns, and thereby accomplishing a spiral form. CONSTITUTION:Between a spiral pipe C leadingly wound on a rotary mandrel 4 and a band A extruded from a plastic extruder 2 and wound anew on the mandrel 4, a flexible reinforcement B as a core for piping is supplied from a reinforcement extruder 3 while a metal wire M is fed from a metal wire supplying means 11. An endless belt 5 under guidance of rollers 8-10 is wound a plurality of turns between adjoining flexible reinforcements B so that the band A is put in pressure contact with the leading spiral pipe C through the metal wire M, followed by joining together by pressure, to constitute a corru gated pipe F having spiral ridge D. Thus a corrugated pipe having a uniform spiral pitch is accomplished easily.

Description

[Detailed Description of the Invention] (a) Industrial Application Field This invention relates to a corrugated pipe and its pressing part (astringent core type). Corrugated pipes that are often used as υF water pipes by being buried, especially corrugated pipes that have a convex part in the shape of a screw 1 on the surface, and their joining press parts H and shape-retaining core molds.

(C)) Conventional technology Generally speaking, in corrugated pipes, the concave and convex shapes of the pipe wall 9 are on the axis λ!
1. A corrugated tube with a spiral concave and convex shape, that is, a corrugated tube with a spiral convex strip, for example, a pipe made of a molten synthetic resin on the circumferential surface of a rotating mandrel. 1i
The strip is wound in a spiral, and during this winding, the part of the strip that was previously wound is later wound 4-Is of the strip is overlapped with 41, 11≦. (In addition to supplying the strip, a flexible core material having a specific cross-sectional shape fT J' along the length of the strip is supplied,
It is rubbed by forming spiral protrusions on the surface.

Then, the overlapping parts of the strips are pressed together by one pressing roller installed parallel to the circumferential surface of the rotating mandrel, thereby forming an integral Korgu tube (Japanese Patent Laid-Open No. 56-101832). (See the official bulletin).

(c) Problems to be Solved by the Invention However, as mentioned above, when pressing and joining the overlapping parts of the strips using the pressing force CJ-
Since there is only one press and only one press is made with almost point contact, a long press joint "'f Hl" cannot be obtained.
If the synthetic resin is hard, it may lack bonding properties, while if the synthetic resin is soft, the cross-sectional shape of the spiral convex stripes may become distorted, resulting in the problem that a corrugated pipe with the specified toughness cannot be obtained.

On the other hand, our corrugated pipe is as described above.
It can be buried in the knee and used as a CUI water pipe, but it is a band-shaped body! If the compatibility of n parts is insufficient,
There was a problem that υ1 water came out of A and H, and the water inside entered -, so that the drainage L1 and -1 adjustment and front pressure were difficult.

(d) Means for solving the problems and their function This invention provides a method for supplying a molten synthetic resin strip from an extruder around a mandrel, winding it in a spiral shape, and superimposing it on top of each other.
A reinforcing space is defined inside or on the back side of the strip along the longitudinal direction of the strip, and concave and convex portions are formed on the surface. ,
While the corrugated tube is held on the mandrel, it is formed of a synthetic resin strip in a molten state. A core mold for the L-type core is inserted into the reinforcing space, and then the shape-retaining core mold is taken out by cutting the dividing layer of the reinforcing space, and the cut part is removed. from the outside with a strip of material (I
-1, and at least the top of the outer peripheral surface of the strip material! 1 (This is a corrugated pipe made of a large number of fine reinforcing ridges along the longitudinal direction.

However, this invention has the purpose of closing the cut portion with a strip material after removing the shape-retaining I11 core PE°L inserted into the hli strength space for shape-retaining purposes, and By forming a reinforcing protrusion with a constant t''1 on one part of the pipe, we will strengthen the convex part that has become mechanically weak due to cutting, thereby providing a strong corrugated pipe with a simple structure. That's what I mean.

In this invention, the convex portion and/or concave portion of the corrugated pipe is engaged and pressed continuously in a linear manner over half the circumference or more using a specific linear volatile pressure IV4< material. By this pressing, regardless of whether the synthetic resin is soft or hard, the joining properties of the corrugated pipe are improved, and the shaping property is also improved, so that a strong corrugated pipe can be obtained.

Here, the linear pressing member means a convex part of a corrugated pipe or a concave part formed between the convex parts in a continuous manner over about half the circumference of the corrugated pipe, that is, a spiral angle of 360 degrees or more. At the same time, an endless belt can be mentioned as a preferable example. The linear pressing member engages with the convex portion and/or the concave portion and the pressing displacement range may be the opening when the corrugated pipe is on the mandrel, but the range of the press deviation may be from 1 turn (helical angle of 360 degrees) to 5 turns on the back of the mandrel. Wrap around the waist is preferred, and more preferably 2 to 4 wraps around the waist.

t) 1:) Of course, these windings can be done not only from the first turn, but also after the first 2 to 3 turns. Naokawa Neai U
If the portion is along the concave portion, it is desirable to determine the cross section of the linear pressing portion (O) so that the overlapping portion U' can be directly pressed.

Since the endless belt with the above structure constantly comes into contact with the high-temperature synthetic resin in a molten state, it is particularly required to have heat resistance in addition to its original toughness and malleability. Specific examples of materials include U-tachi made by laminating cloth with a goto, but heat-resistant rubber is particularly used as the rubber. Of course, such an endless belt is preferably cooled with cold water, cold air, or the like.

In this invention, the cylindrical mandrel is made by winding a synthetic resin supplied in a molten state from an extruder into a corrugated tube continuously in one direction by winding a part of the synthetic resin in a helical shape without pinching together. Therefore, in a cylindrical mandrel, a large number of rotors are rotatably supported obliquely (with respect to the axial direction) on the original body surface of the cylindrical mandrel, or the mandrel is The thin cylinders are arranged substantially parallel to each other and obliquely (with respect to the imaginary cylindrical axis of the mandrel). Furthermore, if the cylindrical mandrel itself does not have the function of sending the corrugated pipe in one direction, the mandrel itself can be moved laterally in the axial direction using a rail, etc., or the mandrel can be fixed and the synthetic resin 1111 It is also possible to move the mountain machine laterally using rails, etc.

The present invention provides the following (iXii) pressing member for joining corrugated pipes or (iii) a shape-retaining core mold 4'.

(i) Around the mandrel (in this case, a molten synthetic resin strip is supplied from an extruder, wound spirally, and twisted together, while being applied to the inside or back of the strip along the longitudinal direction of the strip). While the corrugated pipe is held on a mandrel by inserting a flexible HTI reinforcing material or by forming a section to form a hli-strength hollow part and forming concave and convex portions on the surface, the corrugated pipe is held on a mandrel. j+l (end belt) is a pressing member that engages the protruding portion and/or the concave portion over half the circumference or more of the corrugated pipe, and presses and joins the overlapping portion of the corrugated pipe band onto the mandrel; A base layer with a shape of 4'
Engagement with corrugated pipe 11 with small slip II'/friction coefficient
Contact with the 11 mandrels 11! 4"
Pressing member for joining corrugated pipes, consisting of a layer and a glide layer.

(i) A molten synthetic resin strip is supplied from an extruder around the mandrel, and while it is spirally wound and folded together by 1n, the inside or back surface of the strip is covered with 41 strips of resin along the longitudinal direction. Strong space: 1 $ is divided into sections, and while the corrugated pipe with concave and convex portions formed on the surface is held on the mandrel, the synthetic resin in the molten state (formed in 11-shaped bodies) is heated. A pressing member that is inserted into a reinforcing space, presses and joins the overlapping part of the corrugated pipe strips against a mandrel, and is then taken out by cutting the dividing layer of the reinforcing space, and is endless. A belt-shaped base layer, and a 4゛ slip h formed on the back of the surface of this base layer, at least in a portion close to the mandrel, which has a small coefficient of shear friction and allows slipping when it comes into contact with the mandrel before being inserted into the corrugated pipe. A pressing member for joining corrugated pipes consisting of ``1.

(11) A molten synthetic resin strip is supplied from an extruder around the mandrel, and while being wound spirally and overlapping, reinforcing I11 parts by weight inside or on the back of the strip along the longitudinal direction of the strip. While the corrugated pipe is held on the mandrel, the reinforcing space (-0 A shape-retaining core type is taken out by cutting the partitioning layer of the reinforcing space n1 (reinforcement space n1), which is removed by cutting the partition layer of the reinforcing space n1, and then forming a belt-shaped base layer and the surface of this base layer. It is formed in at least five parts on the mandrel, and the 4' edge has a small friction coefficient and is in contact with the mandrel before it is inserted into the corrugated pipe by 4 degrees.
! A shape-retaining core type consisting of a 4" layer that allows for 4" of slippage.

Although it is 4 degrees, it is a corrugated game according to this invention!・The pressing part for pipe joining (4 or shape-retaining core type is different from normal endless belts because it applies a layer with a small slip friction coefficient of 4° at least in the contact area with the mandrel, so it uses a molten synthetic resin strip). During the engagement ii1 with the body (including during partial engagement), there is little disturbance in the helical pitch due to contact with the mandrel, and thereby a corrugated pipe with a uniform helical bidge can be obtained.

(e) Examples The present invention will be described in detail below based on specific examples of devices shown in the drawings. Note that this does not limit the invention.

First, in FIGS. 1 and 2, a corrugated pipe continuous manufacturing apparatus 1 includes a synthetic resin extruder 2 that continuously extrudes a synthetic resin tubular body 8 in a molten state, and a synthetic resin tubular body B as a flexible reinforcing material. A 1+l+ strong extruder 3 that continuously extrudes, and a rotating mandrel 4 that continuously forms a spiral tube C by overlapping the tubular body B in a helical manner on the band-shaped body supplied from both of these extruders. , a metal wire supplying means 11 that continuously supplies and interposes an elongated metal wire (M) between the overlapped portions of the strips, and the overlapped portions of the obtained spiral tube C are pressed and joined; It mainly consists of an endless belt 5 as a linear pressing member for shaping the spiral protrusions 1 described later.

The rotating mandrel 4 is a hollow shaft 6.7 of a towing book.
are arranged substantially parallel to each other at predetermined intervals along the circumferential surface of one virtual cylinder. A chain is attached to one of the two shafts to rotate at a constant speed in the same direction, thereby substantially causing the rotating mantle 4 to rotate at a speed of 4 degrees.

The endless belt 5 has a cross section corresponding to the cross-sectional shape of the later-described 4° spiral concave IC on the f7J spiral screw, and is movably supported by C1-ra 8, 9.10. There is.

The metal wire supply means II consists of a [7-ra 14 and a guide 15 that guides the metal wire (M) from this (!-ra) to the overlapping portion of the strips.

Next, a corrugated pipe continuous manufacturing apparatus 1 having the above configuration
The operation will be explained based on FIGS. 1 and 2, and the continuous manufacturing method of corrugated pipes will be explained accordingly.

When the rotating mandrel 4 is rotated (1 (substantially) and a molten polyethylene resin strip Δ is supplied from the synthetic resin extruder 2 around the rotating mandrel 4, the strip becomes spiral-shaped. is wound to form a threaded Jjc tube C. When the belt-like body is further wound, on the back of the belt-like body,
From hli reinforcement extruder 3, poly”, tyrene resin tubular body 1
1 along the longitudinal direction to the strip, filter 1'. Thus, raij! On the surface of the e-stone 0, a convex 111-minute spiral protrusion I] is formed, and the appearance of the corrugated pipe F is substantially arranged.

In addition, the above-mentioned spiral tube C is formed by first winding the part of the band-like body A which has been turned for 1tJ 4'; The two parts are overlapped with each other via the metal wire (M), and the overlapping part t1 of the two parts is pressed into a wrap-around shape by the endless belt 5, thereby making the joint stronger. Usually, the speed at which the belt-shaped body A and the tubular body 13 are pulled by the rotation of the rotating mandrel 4 is faster than the speed at which those six bodies are pushed out <V! Since the painting body is still in a soft state, the joining of the two strips at the part u is done for the time being, but it may be insufficient. Conventionally, a pressure roller has been used to press the overlapping portions, but since the pressing time (or distance) is instantaneous, the effect may not be sufficient depending on the state of the synthetic resin. However, according to the wrapping-like pressing by the endless belt 5 described above, that is, the continuous pressing during approximately 3.5 spiral rotations (approximately 360 x 3.5 degrees), the overlapping portions can be joined continuously for a long time. It is fully guaranteed. In addition, the cross section of the endless belt 5 has a concave shape 11 formed between the spiral convex stripes.
Corresponding to that of the spiral four threads (concave groove) as 9 minutes, the same (η
Since they are engaged continuously for a long time, corrugated pipe I and pipe F can be obtained in the desired shape, that is, the desired pressure resistance strength. In particular, the rotation of the rotating mandrel 4 brings the molten state A and the tubular body B into an IQ state, so for example, the tubular body B
becomes flattened in the direction parallel to the rotational axis of the rotating mandrel 4, and therefore a decrease in pressure resistance is usually unavoidable.However, due to the shaping action of the endless belt 5, the cross section of the tubular body B becomes It maintains a perfect circular shape and achieves the desired pressure resistance.

Unlike the second example above, the manner in which the strips are superimposed and the way in which the tubular body is interposed between these strips can be changed as shown in FIG. 3. In other words, the strip Δ has a width of 2
It covers the rolled tubular bodies I3a, 13a from the outside.

Next, a corrugated pipe continuous manufacturing apparatus 1bli shown in FIG.
, two synthetic resin extruders a2b, 2'b, two endless belts 5b, 5'b, and two metal wire supply means 11'b, llb. That is, first, a molten polyethylene resin strip A'b is supplied from the extruder 2'b around the rotating mandrel 4b, and the strip is spirally wound and overlapped with a metal wire (M'b )
A spiral tube C'b is formed with the . And since this spiral tube C'b does not have any spiral concave or convex lines,
Endless belt 5゛l
) to ensure a secure bond. Next, on top of the obtained spiral tube C' b, the strip body and the tubular body ub are superimposed in the same manner as in FIG. Although the explanation will be omitted, the obtained =1 Lucate tube 1''b is a double tube (1 inch structure) as shown in FIG.

G11 is the overlap of the strips A'b and 1 serving.

Unlike the above six examples, the synthetic resin tubular body is inserted into the inside of the band-shaped body and wound spirally, and the metal is interposed between N-fi1 and 6.1 <, and further overlapped! li R,! :
And cross section! 118F, basically anything can be used for the character-shaped part. 4-However, in Figure 6(A),
In the molten state, the synthetic resin tubular body 13c is inserted into the synthetic resin body AC, and is spirally wound around a rotating mandrel (not shown). It is formed into a helical tube 4' with a metal member interposed therebetween. Then, a part Gc of the band AC is press-joined by an endless belt 5c shown by a dashed line 4', and the helical convexity of the band AC is The row Dc is shaped.
The strip AC is obtained by feeding the previously molded tubular body 1]c into a synthetic resin extruder, holding the tubular body 11e in the center through an extrusion nozzle, and extruding it into a molten synthetic resin. The LaLaron extrusion nozzle has an opening cross-sectional shape that corresponds to the cross-section of the band-like body Ac, and is approximately in the shape of an inverted L. In the example shown in FIG. This is an F-shaped case.

In this way, the elongated metal 119 material interposed in one part of the overlapping corrugated pipes is installed in an iJ (
It may be fed by a feeding machine, but when the strip is pushed into the shape of 111, the metal part is
By using, as A, an irregular cross section with an abbreviated character-shaped section (dead tree cross section + 1111 structure),
Furthermore, a corrugated pipe with high pressure resistance (large section modulus) can be obtained. Applications that require particularly high pressure resistance, such as drainage pipes, supply/drainage pipes for roads, railways, developed areas, etc.
Wide range of uses for various types of supply/drainage pipes such as sewage supply/drainage pipes in factory sites, high-rise housing complexes, etc., underground wiring 4" electric wires, protection pipes for piping, and other pressure-resistant pipes for immediate installation. more suitable.

As a further different example, as shown in (a) ([7) of Fig. 6(C), a strip-shaped body (8yc) (Ay, c) is supplied and wound in a spiral shape without overlapping a part. In this case, it is also possible to simply supply the metal wires so that the cross section is bent, and to interpose an elongated metal wire (My c) (My, c) in the overlapping portion.

In this example, unlike the bipedal example, the inner surface of the corrugated pipe is not flat and has four spiral stripes.

Furthermore, as shown in (A
When supplying αC0Δβc, AγC and winding it in a spiral shape without overlapping a part, "C1 is simply supplied so that the cross section becomes a mesh, and the long thin metal wire Mαc is applied to the overlapped part.
, Mβc, and MγC, respectively. In these cases, the tube body is not a corrugated tube, but a simple cylindrical tube, and the inner and outer surfaces are rounded. ff.

Furthermore, the spiral tube as described above is placed on top of the inner spiral tube (on the outside) as shown in FIGS. 4 and 5, and the structure shown in FIG. You can do it.

Above are examples of other cross-sectional structures of corrugated pipes.

Fig. 6 and Fig. 8 show the back side of the strip Δ0 and the longitudinal direction of the strip Ao.
) is a flexible reinforcement material such as hard vinyl chloride resin 13
An example of inserting e is shown.

Figures 9 and 10 Figure 9 shows a metal member (llll''
A spiral inner tube (^'xd) is formed, and then a synthetic resin tubular body (BX (1) as a reinforcing member is extruded (inserted) together with a molten synthetic resin around the inner tube to form a spiral outer tube. An example of an apparatus for forming (Axd) is shown corresponding to Fig. 1 or Fig. 4. Fig. 1O shows a cross section of the obtained corrugated pipe. Since the portions are at different positions in the tube axis direction, the occurrence of non-adherent portions can be reduced.

Figures 11-13 The cross-sectional structure of the strip is the inverted U-shaped piece 11h and both 911 of this piece.
Large and small horizontal pieces 1h, Jh and h (
A spiral concave bottom joins the two pieces, and a small horizontal piece,
1h and the tip of the large horizontal piece 1h are overlapped,
It is suitably joined to an endless belt (not shown) at 51.

14-16 The cross-sectional structure of the strip is shown in FIG.
m, a horizontal piece J extending horizontally outward from one end (right end) of this piece, and an inclined piece extending slightly downward from the curved end! and a hard piece fil K m that closes the downward opening portion of the projector piece. 1515-1
Figure 6 shows an example in which the cross-sectional structure of the strip is slightly different from that shown below.

Section 11 disease.

A separate hli strong En may be formed around the outer periphery of the spiral convex portion of the corrugated pipe obtained as described above.

In particular, a large number of fine protrusions may be formed on the surface to strengthen the reinforcing force. In the example of Fig. 17, at the top of the convex portion + IS,
By forming a large number of fine protrusions (Ns) (Ns) on the surface and increasing the cross-sectional modulus of the protruding parts, it is hollow (one-piece structure, so it does not cause caving, scratches, or holes). The length of the first part is 11 degrees. Also, there are convex stripes:
There are noticeable scratches on the top of 4', but these fine protrusions solve this problem, and these protrusions can be used as fins to promote heat exchange (
In particular, it has the effect of quickly cooling the molten N17 strong layer).

Next, still other embodiments of the present invention will be described in detail based on the drawings.

This embodiment device Ye shown in FIGS. 18 to 20 is as follows:
This figure shows how it is applied to the manufacturing equipment for synthetic resin corrugated pipes, which can change the pipe diameter and the helical pitch of the stiff strips.
In the figure, 101 is the base, 102 is the base +01 and many supports I! Fixed support via 1 rod 103! ? The base 101 and the face plate 102 allow the operating shaft 10 to be
4 to be rotatable support F,'? are doing.

Since several forming shafts 105 are arranged along a virtual cylindrical surface centered on the operating shaft 104, each forming shaft 10
5 is formed by a large-diameter long shaft 105a and a small-diameter short shaft 105b, which are connected via a universal joint 106, respectively.
5: By slightly bending L with respect to the short axis 105b, the long axis 105a is slightly inclined with respect to the operating axis 104. In addition, each short axis IQ5b of 1171 is
Each sleeve is connected to a driving means (tIJ'' in the drawing) via a connecting shaft 107 which can be expanded, contracted and bent, so that the eight molded sleeves 105 are driven all at once in the same direction by this driving means.

In addition, the njj operation shaft 104 is equipped with top members 108a and 108b that move toward or away from each other in the axial direction by rotation of the shaft, and the long sleeves 105a are attached to each of the top members 108a and 108b, respectively. By being pivotally connected via the connecting rods 109a and 109b, each of the molded sleeves 105 marked n and i is connected to the operating shaft 104.
The actuating shaft 1 of each forming shaft 105 is supported by rotating the top members 108a and 108b relative to the actuating shaft 104.
The slope rl+ with respect to 04 is to be changed.

In this embodiment, a plurality of molding shafts 105 are used to determine the pipe diameter of the synthetic resin pipe to be molded and to vary the helical pitch of the strong striations. If the tube diameter and helical pitch are not changed in this way, a general forming shaft may be used. The general molding shaft referred to here is one that is conventionally known, for example, a cylindrical molding shaft attached to the outer periphery of the molding main shaft. ? It may have any structure, such as a molded shaft formed by supporting a large number of shafts in an inclined manner by a container.

Therefore, the strip material 110, which is passed eight times so as to extend between the above-mentioned molding shafts 105, is made of, for example, polyolefin-based hard synthetic resin such as polyethylene resin, polyb c1 pyrene resin, or vinyl chloride resin, so that it can be extruded. It is extruded from the molding die 113 of the molding means 112 into a desired shape, for example, a flat plate, and each molding shaft 105 is molded in a semi-molten state.
The metal wire 100M is supplied from the roller Ill via the guide 115 to the iTt joint U portion, and is spirally wound so as to extend between the respective forming shafts 105-L.

Then, on each molding shaft 105, a molding core mold 1 to be described later
14, the cross-sectional opening-shaped portion (inverted U-shaped piece) 110a and 1. A plate-shaped long side extending from the lower end on one side of the F-shaped portion 110a! ! 1 < min (large horizontal piece) l
lOL+ and the plate-shaped short side extending from the lower end on the other side (
Small pieces of water (11 pieces) 110c are formed in a series.

On the other hand, six endless molding core molds 114 are spirally wound around each of the molding sleeves 105J and 105J.

The above-mentioned core mold 114 is made of a single piece of wood with a cross-sectional shape that is approximately the same as the mouth-shaped portion 110a of the strip material +10, for example.
Since the belt material is made of a single-strength belt material, if this belt material is previously wound spirally over each forming shaft 105, it will become Jl. , fa is extended to the winding start end, and its both ends are connected to form an end shape. Note that a cutter 118, which will be described later, is inserted into the fourth part of the core mold 114!
'l' 1゛V-shaped etc. line! M114a is formed, and if necessary, as shown in FIG. 20, a guide roller 115 is provided at the starting end where the strip material 11G enters during winding, as shown in FIG.

In addition, like the 0;1 core mold 114, (
・Article ′+ to place χ: 4. An endless body 116 for holding down l'llo is twisted in a spiral shape. This ;1
1 (Similar to the core mold 114, the end of the winding from the end rod 116 is extended to the winding start end, and both ends are connected to form an endless shape. After the strip material 110 has been formed, it is attached from its -H. In the figure, 117 is a guide 'CJ-Lar that guides the entry of the (114?i+i) body 116.

111i < Then, using the molded JTI core 114 and the endless body 11G on each molding shaft 105 as described above, write the thread 111i and screw the molded JTI core 110;! Turn it into a V-shape to form a synthetic resin pipe 100A having a spiral 1-strength strip (protruding strip portion) 100L3 on the outer periphery.When turning the reinforcing strip 100[1], cut grooves to is formed continuously, and then cut 1r.
In order to close IHOOc, a cutter 118 is provided in front of the synthetic resin pipe 100Δ in the helical advancing direction.
At the same time, a molding die 120 of the extrusion molding means 119 is disposed in the spiral advancing direction +fii from the cutter 118.
, and a synthetic resin strip material 11 of the same quality as the strip material 110 is provided on the top of the reinforcing strip 100 [+].

Next, the operation of this corrugated pipe manufacturing apparatus will be explained.

First, the semi-molten strip material 11G supplied from the molding die 113 of the extrusion molding means 112 is wound so as to span between the molding shafts 105 which are driven and rotated in unison.

At this time, a molding core is placed between the upper parts of each molding shaft 105 in advance.
114, the strip material 110 has a mouth-shaped portion 110a, a long side portion 110b, and a short side portion 1.
10C. In addition, since each forming shaft 105 is slightly inclined, the strip material 1
10 is spirally wound and the preceding strip material 11
The opening-shaped portion 110a of the subsequent strip material 11G and the short side gB 110c overlap on the long side g1<min 110b of 0,
Further, a metal wire 100M is interposed in the overlapping portion. A synthetic resin tube 100 is integrally welded and has a spiral hli strong strip 013 on the outer periphery and has a flat inner surface of the tube wall.
Eight are formed one after another. In particular, the inn rectangular portion 110
The spiral reinforcing strip 10013 from 4 is again! 1'' on the long side portion tto b and the short side portion ILOc, which are polymerized in L;
Since a pipe wall is formed, the inner surface of this pipe wall becomes flat.

On the other hand, since the endless body 116 is supplied to the outer periphery between the reinforcing strips 10013 of the synthetic resin pipe 100A, as described above (the long side portion 110b and the short side portion 1i that overlap with each other)
The polymerization state is further increased and the welding is performed reliably by crimping the synthetic resin TT tooΔ, which is then continuously molded as described above.
) A cutter 118 is pierced at the top of the strip 100B to continuously form a cut ii+t10GG at the nape of the reinforcing strip IQ 01.1, and then the core mold 114 is cut hli through the cut i/1T100C. It is extracted from within the strip 001-3 and returns to the winding start end 11ζ. In addition, fliJ cutter cutter 1i 8th 4th V-shaped strip 171T 114
Since the cutting edge penetrates up to point a, the cut can be made completely. Note that the hfi strong strip 013 has a core type 11.
Cool until it does not lose its shape when you take it out.

After this, the semi-molten strip material I11 is released from the molding die 120 of the extrusion molding means 119. +Ii strong strip I is supplied to the neck section of strip II, and the reinforcing strip + oourrt section is cut i/IH.
It closes down OOC. Since this strip material Ill is made of the same synthetic resin as the strip material +10, it is formed into a plate shape with the same width as the "1 part width" of hli strong strip 013. When the mold 114 is pulled out, it opens 4", and after being pulled out, it does not close completely and remains slightly open. +'IT
Semi-molten strip-shaped material 11 in I 00 C
After 1 partially enters, it solidifies and nil is marked 1yytooc
It plays the role of a binder to firmly join the top parts of the reinforcing strips 1000 that have been divided by the above.

In addition, the synthetic resin pipe 100A molded as described above
In the illustrated example, the h-junction boundary between the strip material 110 and the strip material III is clearly shown, but in reality, all the same materials are heat-fused 11 and integrated.

As shown in FIG. 22, the synthetic resin tube 100Δ manufactured by the apparatus of this embodiment has a tube wall formed by a long side portion 110LI and a short side portion 110c that overlap each other and are continuous in the tube axis direction. , the inner surface thereof is used for the instep, and realizes flexibility and a low position of the channel in the pipe, and the spiral reinforcing strip is formed by the mouth-shaped portion 110a. , +: Can provide high crushing strength. .

It should be noted that the present invention is not limited to the structure described in the previously described embodiments, but may be modified and improved as appropriate. For example, as shown in FIGS. 23 and 24, the first core mold for molding is sent out from the bottom i1 (of the molding die 113 in the extrusion molding means 112) with tea water 4,1110, and the molding core is spirally shaped on the molding shaft +05. It may be wound, and the end of the winding may be placed under the molding die 113 at an angle of 1 degree and 1 degree per degree.

Also, as shown in the same figure, every 4° (ring-shaped j110°1
One or several pieces of the shield body 116a are used, and this is attached to the forming shaft 10.
5” reinforcing strip 100 of synthetic resin pipe 100Δ molded with two
Between the 1' and 3 spirals, a weight 116c is attached to the lower end of each ring-shaped endless body 116a, and a movable body 116Ll such as a pulley is hung, and the strip material +10)'
Ti if? Long and short side portions 110b and 1 that meet 4'
It is also possible to perform crimping of lOc and prevention of deformation of the mouth-shaped portion 1103. At this time, the weight 116c is made replaceable, and the long and short side portions 100bl1O
It would be better to be able to adjust the crimping load c.

In addition, in all of the above-described embodiments, the strip material 110 was formed into a Heisei shape, and then wrapped in a semi-molten state around the first core mold.
A strip 11tto consisting of a ζ portion 110a, a long side portion 110b, and a short side molecule loe is molded in advance with a molding gouer 113, and the rod opening 110 is inserted into the molded shaft 10.
5 may be provided with υ().Furthermore, in addition to the 1p- mouth-shaped part ILOa provided as the ntj notation element ILOa, two or three parts may be formed as shown in Fig. 25. It is also possible to form the above parts and polymerize them at the time of molding.Alternatively, as shown in FIG.
10a, ``Form the thin part 110 + I in advance in one part, and then perform the subsequent cutting I/¥1000 reliably U
Even if I try to do it, it's not good.

In addition, (1F-shaped material Ill is <12J as in the example described above)
Ifi100C may be entered, but the second
As shown in Figures 7 to 29, the width of this band +: material III may be cut to be slightly larger than the width of the i/-Hooc. Furthermore, as shown in Figure 29 (,:j7
The shape of the shaped material Ill may be such that the total number of reinforcing strips is 100.

In addition, the cut 17HO formed on the top of hli strong strip 100B)
Oc is the third blade thickness of the cutter 118,
It is best to make sure that there are no gaps as shown in Figure 0.

Also, a core mold 114 for molding and an endless body! 16 is made of belt material, and V! It can be made of rubber, synthetic resin, leather, etc., and can also be made of metal such as aluminum or aluminum alloy. In this case, it is sufficient to divide it into a large number of blocks and bendably connect them with wires or the like.

At this time, a thin belt material may be attached to the inner surface. In addition to the trapezoidal cross-section, the cross-section may be semicircular, square, or round, if necessary.

Fig. 31 shows an example of a synthetic resin pipe to which reinforcing strips 10013 having a semicircular cross section are attached, and the same reference numerals are given to the parts corresponding to the parts in the embodiment described above, and the explanation thereof is omitted. do.

Here, the obtained corrugated pipe has a strip-shaped material (reinforcing layer) on its surface that closes the cut 1 reHooc and also reinforces the protruding portion, on the surface of the corrugated pipe + 1 s.
2-3/I As shown in the diagram, many fine protrusions 100N L
, 100N u and 100N v to strengthen the reinforcing force.

Now, when manufacturing the above-mentioned Niriregate tube, in order to press and join the overlapping parts of the strips, pressing members (5 in Fig. 1, 5 b and 5'b in Fig. 4, 5 in Fig. 9) are used.
xb and 5'X13 (116 in Fig. 18) and a mold (114 in Fig. 18) for forming an endless belt shape are used. However, as these pressing parts and core types, endless belts that are normally used for power transmission can be easily used, but since the main purpose of these endless belts is to transmit power, the surface thereof is It has been treated to prevent it from slipping as much as possible against the target pulley, etc. (the coefficient of shear friction is large).

However, as shown in FIG. 35, the pressing member and core mold used in manufacturing the corrugated tube are formed on the base layer 221 of the core mold 214 and on the surface of this base layer near the mandrel. It is preferable to use a slip layer 222 which has a small friction coefficient and is composed of a slip layer 222 that allows slipping during contact with the mandrel before engagement with the corrugated pipe.

By making the pressing member and the core mold slip easily against the mandrel, the pressing member and the core mold can be moved as shown in FIG. JJ (including JJ) and makes contact with the mandrel 204, since the contact resistance is small, the helical pitch CP> is maintained uniformly at a predetermined size overall, thereby creating a corrugated pipe with a predetermined pressure resistance strength. is obtained. However, the mandrel 204 in FIG. 36 has a pressing part 1 (but
Like the core mold 214, it is wrapped around the body, but is not shown. Further, 223 is another mandrel for stretching the core mold 214 and the mandrel 204.

6. The same applies to the pressing part 314 as shown in Fig. 37, but as shown in Figs. 38 to 39, the pressing part A slip layer 322 is also provided on the side wall of '314, thereby preventing the spiral pattern from deforming.

Here, the sliding layer 222 of the core mold 214 and the pressing part 14'
314 and 322 as H materials, 47) ethylene resin (Teflon resin), polyamide resin (nylon resin)
, synthetic resins such as polyacetal resin (Duracon resin), or woven fabrics such as Cotton woven fabric and Tetoron woven fabric. Specifically, the cotton woven fabric is one with a thickness of 1.2111111 mm ("CC canvas"), which is made by weaving threads of 0.31161 mm thick made of single fibers of cotton in a crisscross pattern ("CC canvas").
Synthetic rubber (cushion rubber) is laminated to this woven fabric, and the rubber is adhered to a pressing member or core-shaped base layer with an appropriate adhesive. On the other hand, Tetron and i-cloth are made by weaving threads of 0.8 mm in thickness made of single fibers of saturated polyester resin (such as Tetron) in a criss-cross pattern and hardening them with a binder (for example, "Tetron"). Canvas (canvas) is an example.

As materials for the pressing member and core base layer, materials applicable to ordinary endless belts can be used as they are.

(f) Effects of the Invention According to the present invention, the pressing member for joining corrugated pipes or the shape-retaining core mold has a layer with a small shear 19 friction coefficient at least in the contact portion with the mandrel, so that the molten state There is little disturbance in the helical pitch due to contact with the mandrel before it is attached to the synthetic resin strip (including when it is attached at the negative part), thereby making it possible to obtain a corrugated pipe with a uniform helical pitch.

[Brief explanation of the drawing]

FIG. 1 is a perspective view illustrating the functions of the main parts of an example of a corrugated pipe manufacturing apparatus according to the present invention, FIG. Figure 4 is a diagram equivalent to Figure 1 showing another example, Figure 5 is a diagram equivalent to Figure 2, Figure 6 is a diagram equivalent to Figure 2 (AXDXCXDXE
), Figures 7 and 8 both show other examples.
Figure 9 is a diagram equivalent to Figure 1 showing an example of a pond, Figure 1O is a diagram equivalent to Figure 2, Figure 11 is a partial side explanatory diagram of a corrugated pipe showing another example, 2 is a longitudinal sectional view of the corrugated pipe, 1311 is an enlarged sectional view of the main part of the longitudinal sectional view, and 14 to 17 are 13 showing still other examples.
Fig. 18 is a plan view showing another embodiment according to the present invention, Fig. 19 is a partially cutaway enlarged plan view of the main part,
Fig. 20 is a side view thereof, Fig. 21 is a sectional view of the tea water material molded on the forming shaft, Fig. 22 is an explanatory diagram of the forming process, Fig. 23
The figure is a side view of a main part showing another embodiment, FIG. 24 is a plan view thereof, and FIGS. 25 to 34 are cross-sectional or end views showing different patterns of the strip material. FIG. 35 is a cross-sectional view showing another embodiment of the core mold, FIG. 36 is a plan view showing the core mold in a convenient state, and FIG. 37 is a cross-sectional view showing another embodiment of the pressing member. FIG. 38 is a diagram corresponding to FIG. 2 when the pressing member is used, and FIG. 39 is an explanatory diagram of the entire structure of the pressing member. l...Continuous production equipment for corrugated pipes, 2...
...Synthetic resin extruder, 3...Reinforcement material extruder,
4... Rotating mandrel, A... Band-shaped body, B... Flexible reinforcing material, C... Spiral tube, D... Spiral protrusion (protrusion part), F...
corrugated pipe. Figure 2 Figure 3 Corner Figure 6 (A) Figure 6 (8) Figure (D) M Buddha C cLC pC M/lic Figure (E) Figure (E) Figure (E) Figure 7 Figure 13 Figure 14 Figure 75 Funeral Figure 16 Figure 17 Figure 25 Figure 27 Figure 29 Figure 26 Figure 28 Figure 30 Figure 33 Figure 34 Figure 35 Figure 37 Figure 39

Claims (1)

[Claims] 1. A molten synthetic resin strip is supplied from an extruder around the mandrel, and while it is spirally wound and overlaid, the inside or back surface of the strip is coated along the longitudinal direction of the strip. In a corrugated pipe in which a reinforcing space is defined and a concave/convex portion is formed on the surface, the convex portion is made of a molten synthetic resin band while the corrugated tube is held on a mandrel. A shape-retaining core mold is inserted into the reinforcing space to be formed to retain the shape, and then the shape-retaining core mold is removed by cutting the partitioning layer of the reinforcing space, and the cut portion is used as a strip material. A corrugated pipe which is closed from the outside and has a large number of fine reinforcing ridges along the longitudinal direction of the top at least at the top of the outer circumferential surface of the strip. 2. A molten synthetic resin strip is supplied from an extruder around the mandrel, and while it is spirally wound and overlapped, a flexible reinforcing material is added inside or on the back of the strip along the longitudinal direction of the strip. While the corrugated pipe, which has concave and convex portions formed on its surface, is held on the mandrel, the convex portions and/or concave portions of the corrugated tube are A pressing member that engages over more than half the circumference and presses and joins the overlapping portion of the corrugated pipe band onto the mandrel, and includes an endless belt-shaped base layer and at least the surface of this base layer on the mandrel. A pressing member for joining corrugated pipes, comprising a sliding layer that is formed in a close portion and has a small sliding friction coefficient and allows slipping when in contact with a mandrel before engagement with a corrugated pipe. 3. A molten synthetic resin strip is supplied from an extruder around the mandrel, and while it is spirally wound and overlapped, a reinforcing space is created inside or on the back side of the strip along the longitudinal direction of the strip. While the corrugated pipe, which is partitioned and has concave and convex portions on its surface, is held on the mandrel, the corrugated pipe is inserted into the reinforcing space formed by the molten synthetic resin strip. A pressing member that presses and joins the overlapping portions of the strips onto a mandrel, and then cuts and removes the partitioning layer of the reinforcing space, which comprises an endless belt-shaped base layer and the surface of this base layer. A pressing member for joining corrugated pipes, comprising a sliding layer formed at least in a portion close to the mandrel, which has a small sliding friction coefficient and allows slipping when in contact with the mandrel before being inserted into the corrugated pipe. 4. A molten synthetic resin strip is supplied from an extruder around the mandrel, and while it is wound spirally and overlaid, a reinforcing space is created inside or on the back side of the strip along the longitudinal direction of the strip. While the corrugated pipe, which is partitioned and has concave and convex portions on its surface, is held on the mandrel, the corrugated pipe is inserted into the reinforcing space formed by the molten synthetic resin strip. A shape-retaining core mold that retains the shape of a strip and then cuts the partition layer of the reinforcing space to take it out, which includes an endless belt-shaped base layer and at least a portion of the surface of this base layer that is close to the mandrel. A shape-retaining core type consisting of a sliding layer that has a small sliding friction coefficient and allows sliding when in contact with a mandrel before being inserted into a corrugated pipe. 5. The pressing member according to claim 2 or 3 or the shape-retaining core mold according to claim 4, wherein the sliding layer is a cotton woven fabric, a Tetoron woven fabric, a Teflon resin layer, or a nylon resin layer.