JP2006158197A - Flexible tube electric wire conduit tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flexible tube electric wire conduit tube in which long distance piping is performed, and moreover, it is even if it is the case where many bending parts are contained, it is superior in passing wire through. <P>SOLUTION: In the flexible tube electric wire conduit tube, to which the passing wire through, threading wire of the electric wire or the cable is performed, it has a main part 1 of the pipe which is made of any of synthetic resin material of a polypropylene, a polyethylene, a hard vinyl chloride, and a polyamide, the inner wall of the main part 1 of the pipe has a plurality of recesses 1aa and convex parts 1ab, to become a wave-like as cross-sectional seen along an axial direction. In the convex part 1aa, a liquid lubricant, which consists of silicone oil which reduces the frictional force with the electric wire or the cable, or a powder lubricant which consists of either of an ethylene tetrafluoride, a talc, a fatty acid amide, and a molybdenum dioxide is made to adhere. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a flexible tube conduit that is piped prior to laying an electric wire or cable and used for wiring of the electric wire or the like.

  2. Description of the Related Art Conventionally, in factory facilities and office buildings, high- and low-power cables and information lines are laid on the ceiling or on the cable rack on the back of the ceiling or under the floor. In this laying, the electric wire itself may be laid as it is, but normally, in order to protect the electric wire etc., the electric pipe etc. is piped in advance and the electric wire etc. is passed through the electric wire pipe. Things have been done. The conduits include those made of steel plate and those made of synthetic resin. As the latter manufacturing method, for example, a manufacturing apparatus disclosed in Patent Document 1 (Japanese Patent Publication No. 45-16835) is used. Things are known.

  FIG. 11A is a schematic diagram of the manufacturing apparatus. As shown in FIG. 11, a parison (a molding material, for example, a molten tubular thermoplastic resin) is led out from the die nozzle 2, and from a gear, a motor, or the like. Is supplied into a mold track T driven by a mold driving device 9. The mold track T rotates in the direction of the arrow in the figure to form a shuttle loop, and each has a portion that contacts and interlocks with the other mold track T. And in this contact interlocking | linkage part, the conduit 1 is shape | molded so that the parison derived | led-out from the die nozzle 2 may be inserted | pinched sequentially. A more detailed configuration of the die nozzle 2 and the like is as shown in an enlarged cross-sectional view of a main part of FIG. 11B. A material extrusion passage 20 is formed inside the die nozzle 2, and the inside of the passage 20 is filled with a resin material. R (thermoplastic resin) is extruded in order in a molten state.

  Further, the flow passage 4 for the blow fluid A is formed inside the material extrusion passage 20 inside the die nozzle 2, and the flow passage 4 is a hollow support rod 7 engaged with the tip of the die nozzle 2. Connected to its hollow part. A large number of forming dies 90 forming the mold track T are connected in a pair of strips by a chain member or the like so that the forming surfaces thereof face each other, and a shuttle engaged by driving a gear engaged with the chain member by a motor. A loop is formed. Then, the molten resin material R is led out with respect to the opposing mold 90, and a blow fluid A (not shown) is blown out from an outlet formed in the support rod 7, and the molten resin material R is discharged. By driving the shuttle loop while being pressed against the molding surface of the molding die 90, a desired cross-sectional wave-like electric conduit can be continuously molded (this is called continuous extrusion molding).

  At this time, a predetermined pressure space S is formed by providing a sealing plug 70 between the pair of molds 90 and at the tip of the support bar 7 so that the pressure of the blow fluid A does not decrease. Yes. By comprising in this way, it is possible to manufacture the synthetic resin conduit. By the way, about the wiring of the electric wire etc. in a conduit, wiring property may become a problem. In other words, since the conduit that is the subject to be wired is appropriately bent according to the space of the factory equipment, etc., friction increases between the inner wall of the conduit and the electrical wire, which sometimes makes the wiring work difficult. There is a case to be extreme. Therefore, various inventions have been proposed in the past in order to further improve the lineability.

  For example, in the invention disclosed in Patent Document 2 (Japanese Patent Laid-Open No. 55-80205), the main purpose is to improve the coil winding property, but a lubricating coating made of an unsaturated fatty acid ester or the like is formed on the coating of the electric wire. It is disclosed that the formation reduces the coefficient of friction of the coating. According to the present invention, the efficiency of the wiring operation is improved even in the bent portion of the conduit as compared with the case where the lubricating coating is not formed. However, in the present invention, since a lubricating coating is formed on the coating of the electric wire, the portion led out from the conduit is pulled for wiring, or the electric wire is transported. In some cases, slipping occurs and the workability is lowered.

Therefore, in view of such a problem, it is known that a lubricating film is provided in a conduit that is a subject to be wired, instead of providing a lubricating film on the coating of the electric wire. For example, in the invention disclosed in Patent Document 3 (Japanese Patent Application Laid-Open No. 2000-13952), the lineability is one of the purposes, and fatty acids and silicon-based additives are blended in the inner lubricating layer. It is disclosed. According to this invention, the efficiency of the line work can be improved without the above-described problems.
Japanese Patent Publication No. 45-16835 Japanese Patent Laid-Open No. 55-80205 JP 2000-13952 A

  However, in the invention described in Patent Document 3, the inner layer surface of the conduit is flat, and the lubricating layer surface is also flattened accordingly, so that the contact area between the lubricating layer and the electric wire is small. growing. Therefore, when long-distance piping is used and a large number of bent portions are included, there is still a problem that the lineability may be hindered.

  The present invention has been made in view of the above-mentioned problems, and the object of the present invention is excellent in wiring even when long-distance piping is used and a large number of bent portions are included. Another object is to provide a flexible tube and conduit.

  In order to solve the above-mentioned problems, the inventors of the present application, as means corresponding to claim 1, in a flexible electric conduit that is previously piped and through which an electric wire or cable is passed, polypropylene, polyethylene, hard chloride It has a tube body made of a synthetic resin material of either vinyl or polyamide, and the inner wall of the tube body is provided with a plurality of recesses and projections that are substantially wavy in sectional view along the axial direction. Is characterized in that a liquid lubricant made of silicone oil or a powder lubricant made of any one of ethylene tetrafluoride, talc, fatty acid amide, and molybdenum dioxide is attached to reduce the frictional force with the wire or cable. Proposes what to do.

  And in invention of Claim 1, since it has the some recessed part and convex part which become a cross-sectional view substantially wave shape along an axial direction in the inner wall of a pipe | tube main body, the contact with the said inner wall and a linear body The area is small, and since the lubricant that reduces the frictional force between the striate body and the convex portion is attached to the convex portions, in combination with the configuration of the inner wall, long-distance piping is performed, Moreover, even if it is a case where many bending parts are contained, there exists an effect that favorable lineability can be ensured.

[First Embodiment]
Next, the best mode for carrying out the present invention will be described in detail based on the above-described means for solving the problems and the effects thereof. First, the configuration of the flexible tube 1 according to the present embodiment will be described with reference to the cross-sectional view of FIG. 1. As shown in FIG. 1, the flexible tube 1 includes a tube body 1 a that is a tubular member and its inner wall. And a lubricant layer 1b attached to the surface. The tube main body 1a has a plurality of concave portions 1aa and convex portions 1ab that are substantially wavy in sectional view along the axial direction of the tube main body 1a on at least the inner wall thereof. In the example shown in the figure, the outer wall also has the concave portion 1ac and the convex portion 1ad, but this is because flexibility is taken into consideration, and is not an essential configuration. The material of the pipe body 1a is made of a synthetic resin, and as an example, polypropylene, polyethylene, hard vinyl chloride, polyamide, or the like is used.

  On the other hand, the above-mentioned lubricant layer 1b is attached to at least the convex portion 1ab formed on the inner wall of the tube body 1a. In the example of the figure, the concave portion 1aa is also formed uniformly, but this is easy when the opening area of the concave portion 1aa is large, and the end portion of an electric wire or the like enters the concave portion during wiring. This is because it is considered to be off, and is not an essential configuration. The lubricant constituting the lubricant layer 1b is sufficient as long as it reduces the frictional force between the convex portion 1ab formed on the inner wall of the tube main body 1a and the linear member inserted into the tube, and is particularly limited. Although not intended, for example, liquid lubricants such as silicone oil, fatty acids such as ethylene tetrafluoride, talc and fatty acid amide, and powdery lubricants such as molybdenum dioxide are used. In addition, a linear body is a linear thing penetrated in the flexible tube 1, and means an electric wire, a cable, etc.

  As described above, in the flexible tube 1 of the present embodiment, a plurality of concave portions 1aa and convex portions that are substantially wavy in cross section in the axial direction of the flexible tube 1 are formed on the inner wall of the flexible tube 1. Since it has the part 1ab, it is not a flat inner wall like the invention described in Patent Document 3. Therefore, the contact area between the inner wall and the striate body is small, and the frictional force can be reduced. In addition, since the lubricant is attached to at least the convex portions 1ab, the frictional force at the convex portions 1ab becomes low in combination with the configuration of the inner wall described above. Therefore, even when long-distance pipes or a large number of bent portions are present, good lineability can be obtained.

  Next, in describing the method for manufacturing the flexible tube 1, the configuration of the manufacturing apparatus according to the present embodiment will be described with reference to FIG. FIG. 2 is a cross-sectional view of the main part of the manufacturing apparatus, in which a partial configuration of a mold driving device 9 that drives a mold track, a raw material supply device 10 that supplies the resin material R to the die nozzle 2, and the like It is shown in the figure.

  First, the manufacturing apparatus in the present embodiment is different from the conventional one in that the liquid feeding apparatus 13 for supplying a liquid lubricant L (for example, silicone oil) for forming the lubricant layer 1b has a feature; A lubricant supply path 5 connected to the liquid feeding device 13 and formed inside the die nozzle 2 and inside the material extrusion path 20, a blow fluid A (pressure fluid) supplied from the flow path 4, and It is a point newly provided with a mixing device 6 that mixes the liquid lubricant L supplied from the lubricant supply path 5 and blows it out into the pressure space S. And by adopting these configurations, it is possible to form a substantially wave shape consisting of a plurality of concave portions and convex portions along the axial direction of the flexible tube 1 by continuous extrusion blow molding, and to the blow fluid A. Since the lubricant is mixed, the lubricant can be adhered to the inner wall of the pipe efficiently and uniformly.

  Hereinafter, each part of the manufacturing apparatus will be described in detail. The die nozzle 2 is a device that supplies a parison (molding material), specifically, a molten resin material R, into a tubular member and supplies it to a mold track composed of a plurality of molds 90, and is formed in a substantially tubular shape. ing. In the pipe, an inner lip member 3 having a substantially tubular shape is fixed at the end opposite to the pressure space S so as to have a predetermined gap from the inner wall of the die nozzle 2 (fixing means not shown). ), And cantilevered. The gap serves as a material extrusion passage 20 for supplying the resin material R forming the flexible tube 1 to the pressure space S formed by the mold 90 and the sealing plug 70. Inside the pipe of the inner lip member 3 is a flow passage holding hole 30 into which the flow passage 4 of the blow fluid A is inserted, and a narrowed portion 31 for narrowing the material extrusion passage 20 is formed at the end of the mold 90 side. Projected. The flow path 4 is a pipe body that supplies the blow fluid A to the pressure space S, and a lubricant supply path 5 that supplies the liquid lubricant L is formed therein.

  In addition, a substantially cylindrical mixing device 6 (corresponding to a pressing device or a lubricant adhering device) is placed in the space formed by the opposing mold 90 at the tip of the inner lip member 3 on the narrowed portion 31 side. The mixing device 6 includes a flow passage introduction hole 60 into which a tip of the flow passage 4 is inserted, and a blower that is connected to the introduction hole 60 and is supplied from the flow passage 4. A mixing unit 61 for mixing the fluid A with the liquid lubricant L supplied from the lubricant supply path 5 and a blowing hole 62 for blowing the mixed fluid A1 mixed in the mixing unit 61 are provided. Regarding the configuration of the mixing device 6, refer to FIG. 3 (a), a cross-sectional view of the main part showing the periphery of the mixing device 6 in FIG. 3 (a), and FIG. This will be described in more detail as follows. First, as shown in FIG. 3A, the flow passage introduction hole 60 has a hole diameter E, whereas the hole diameter F of the mixing portion 61 is configured to be smaller than the hole diameter E. Further, a lubricant supply path 5 extends from the front end of the flow path 4 by a predetermined distance in the mixing unit 61.

  Then, the liquid lubricant L is atomized by blowing the blow fluid A from the flow passage 4 while supplying the liquid lubricant L from the lubricant supply path 5 to the mixing unit 61 configured as described above. A mist-like mixed fluid A1 in which the liquid lubricant L is mixed with the blow fluid A is generated. As shown in FIG. 3 (b), the blowout holes 62 are radially formed from the axial center to the surface of the mixing portion 61, and in order to efficiently form a mist on the inner wall of the tube body 1a. A value obtained by multiplying the number n of the blow holes 62 by the hole diameter d of the blow holes 62 is a cross-sectional area (direction perpendicular to the axial direction of the tube body 1a) of the mixing portion 61 (circular ratio to hole diameter). The relationship may be smaller than the value obtained by multiplying the square of F by 4). Incidentally, as shown in FIG. 2, a support rod 7 is engaged with the tip of the mixing device 6, and the tip of the support rod 7 has a truncated cone shape toward the inside of the pressure space S. A substantially cylindrical sealing plug 70 is provided. A pressure space S having a predetermined pressure is formed by the blow fluid A between the plurality of molds 90 forming the mold track and the sealing plug 70 and the like.

  The control device 8 is a central processing unit such as a personal computer, for example, and includes a mold driving device 9 that drives a mold track, a raw material supply device 10 that supplies the resin material R of the flexible tube 1, and a blow fluid A. The blower 11 to be generated and the liquid feeding device 13 for supplying the liquid lubricant are connected. Describing each of these parts, the mold driving device 9 is a mold track driving means, and includes a gear, a speed reducer, a motor, a motor driver, and the like. The raw material supply device 10 includes a heating means and a hopper, and is a device that heats the resin material R stored in the hopper to a molten state and pushes it into the material extrusion passage 20 by a conveying means such as a screw shaft. is there. The blower 11 is an air compressor, and blows the compressed blow fluid A to the flow passage 4 through the air volume sensor 12. The liquid feeding device 13 supplies the lubricant for forming the lubricant layer 1 b to the lubricant supply path 5 via the liquid amount sensor 14. The information of the air volume sensor 12 and the liquid volume sensor 14 is output to the control device 8 and used for controlling the blower device 11 and the like.

  Further, the above-described mold 90 forming the mold track has a substantially semicircular shape in a cross-sectional view in a half of the outer wall of the tube main body 1a, that is, in the paper surface direction (direction perpendicular to the axial direction of the tube main body 1a). The semicircular surface is provided with a concave portion and a convex portion. Then, a pair of opposing molds 90 come into contact with each other to form a mold corresponding to the peripheral wall of the tube body 1a. While supplying the parison, that is, the molten resin material R toward the mold, the resin material By pressing R against the molding surface of the molding die 90 with the mixed fluid A1, it can be molded into a predetermined shape. Note that the mold 90 is generally cooled by a cooling device (not shown), and the molten resin material R is solidified.

  Based on the above configuration, the manufacturing method of the present embodiment will be described as follows. First, the control device 8 outputs a control command to the mold driving device 9 so as to start a shuttle loop of the mold 90 constituting the mold track, and the resin supply passage 10 is supplied with resin in the material extrusion passage 20. The same command is output to extrude material R. Further, the control device 8 outputs the blower fluid 11 so as to supply the blow fluid A to the flow passage 4, and supplies the liquid lubricant L to the lubricant supply passage 5 to the liquid feeding device 13. Output. The resin material R supplied from the raw material supply apparatus 10 is extruded through the material extrusion passage 20 and led out into the pressure space S.

At this time, in the mixing device 6, the liquid lubricant L supplied from the liquid feeding device 13 is mixed with the blow fluid A supplied from the blower device 11, and the mixed fluid A <b> 1 is also blown into the pressure space S. Is done. The derived resin material R is pressed against the molding die 90 by the pressure generated by the mixed fluid A1, and the shape of the tube body 1a is molded along the concave and convex portions formed in the molding die 90. Is done. Further, since the mixed fluid A1 contains the liquid lubricant L, the lubricant layer 1b is formed on the inner wall of the pipe body 1a. Thus, the flexible tube 1 provided with the lubricant layer 1b can be continuously formed according to the shuttle loop of the mold track.
[Second Embodiment]
Next, another preferred embodiment will be described with reference to FIG. FIG. 4 is a cross-sectional view of an essential part of the manufacturing apparatus, and a part of the configuration of the mold driving device 9 and the like is shown in a block diagram in the same manner as in the above-described embodiment. The present embodiment is different from the above-described embodiment in that the powder feeding device 15 for supplying the powder lubricant P (for example, talc, ethylene tetrafluoride, etc.) instead of the liquid feeding device 13 is characterized. It is the point which comprises. The powder supply device 15 is a device for supplying the powder lubricant P into the pressure space S. Specifically, the powder supply screw shaft 15 can freely rotate in the lubricant supply path 5. In accordance with a control command from the control device 8, the screw shaft is rotated to send the powder lubricant P to the mixing device 6 (corresponding to a pressing device or a lubricant adhesion device). ing. The mixing device 6 mixes the powder lubricant P with the blow fluid A (pressure fluid) and sprays the mixed fluid A2 onto the inner wall of the tube body 1a, thereby forming the lubricant layer 1b on the inner wall. be able to. Since other configurations and operations are the same as those in the above-described embodiment, description thereof will be omitted.
[Third Embodiment]
Next, another preferred embodiment will be described with reference to FIG. FIG. 5 is a cross-sectional view of a main part of the manufacturing apparatus, and a partial configuration of the mold driving device 9 and the like is shown in a block diagram. The present embodiment is different from the first embodiment in that a blow fluid supply unit 16 (corresponding to a pressing device) is provided instead of the mixing device 6, and a lubricant supply path is used instead of the sealing plug 7. A sealing plug 71 (corresponding to a lubricant adhering device) provided with 710 is provided, and the lubricant supply path 5 passes through the blow fluid supply unit 16 and the support rod 7 to supply the lubricant provided in the sealing plug 71. This is a point connected to the path 710. The above-described blow fluid supply unit 16 has passed through the flow passage introduction hole 160 into which the front end of the flow passage 4 is inserted, the throttle portion 161 formed narrower than the diameter of the introduction hole 160, and the throttle portion 161. And a blowout hole 162 for blowing out the blow fluid A (pressure fluid).

 A support rod 7 is attached to the tip of the blow fluid supply device 16 in the same manner as the mixing device 6 in the above-described embodiment, and a sealing plug 71 is attached to the support rod 7. The support rod 7 in the present embodiment is formed of a hollow member, and a lubricant supply path 5 extending through a blow fluid supply device 16 is inserted into the hollow portion. The lubricant supply path 5 is connected to a lubricant supply path 710 provided in the sealing plug 71. A large number of lubricant supply passages 710 are formed radially in the paper surface direction (direction perpendicular to the axial direction of the tube main body 1a) from the axial center to the surface of the sealing plug 71, and are substantially the inner wall of the tube main body 1a. Liquid lubricant L is supplied to all.

In this way, since the lubricant is leaked from the sealing plug used for continuous extrusion blow molding and adhered to the inner wall of the pipe, long-distance piping is performed in combination with the configuration of the convex portion of the inner wall of the pipe body 1a. Moreover, even when a large number of bent portions are included, good lineability can be ensured. Further, since the lubricant is leaked from the sealing plug used for continuous extrusion blow molding, the lubricant can be uniformly adhered to the inner wall of the pipe, and the pressure of the blow fluid can be reduced and the pressure can be increased. Since other configurations and operations are the same as those in the first embodiment, the description thereof will be omitted.
[Fourth Embodiment]
Next, another preferred embodiment will be described with reference to FIG. FIG. 6 is a cross-sectional view of a main part of the manufacturing apparatus, and a partial configuration of the mold driving device 9 and the like is shown in a block diagram. The present embodiment is different from the first embodiment in that a blow fluid supply unit 17 (corresponding to a pressing device) is provided instead of the mixing device 6 and the pressure supply side S of the lubricant supply path 5 is provided. Is provided in the vicinity of the throttle portion 31, and is provided with a lubricant supply path 50 (corresponding to a lubricant adhering device) that opens to the material extrusion passage 20, and further than the lubricant supply path 50. The narrowed portion 31 on the pressure space S side is a lubricant deriving portion 310 whose outer diameter is reduced to supply the lubricant. The blow fluid supply unit 17 does not include an opening through which the lubricant supply path 5 is inserted at the end on the pressure space S side as compared with the blow fluid supply unit 16 in the third embodiment. Is the same. Further, a large number of lubricant supply passages 50 are formed radially in the paper surface direction (perpendicular to the axial direction of the tube body 1a) from the axial center of the inner lip member 3 to the surface of the throttle portion 31. The liquid lubricant L is supplied to substantially all of the inner wall of the tube body 1a before being molded.

Thus, after attaching the lubricant to the inner wall of the tube, a substantially wave shape consisting of a plurality of concave portions and convex portions along the axial direction is formed by continuous extrusion blow molding. Even if the contact area with the strip can be reduced, long-distance piping is performed, and a large number of bent portions are included, a flexible tube that can ensure good lineability can be manufactured. Further, even if the adhesion of the lubricant before the blow molding is biased, the lubricant can be uniformly adhered to the inner wall of the pipe by the pressure of the blow fluid at the time of blow molding. Since other configurations and operations are the same as those in the first embodiment, the description thereof will be omitted.
[Fifth Embodiment]
Next, another preferred embodiment will be described with reference to FIG. FIG. 7 is a cross-sectional view of a main part of the manufacturing apparatus, and a partial configuration of the mold driving device 9 and the like is shown in a block diagram. Unlike the first embodiment, this embodiment has a feature in that vacuum molding is employed instead of blow molding. Specifically, instead of the mold 90, a mold 91 having a vacuum suction mechanism (a vacuum suction mechanism corresponds to a pressing device) is provided, a vacuum pipe 190 connected to the mold 91, and the pipe 190 A pressure sensor 19 that outputs a pressure measurement value of the fluid in the inside to the control device 8, and a vacuum device 18 that is connected to the vacuum pipe 190 via the pressure sensor 19 and operates according to a control command of the control device 8 is newly provided. Provided.

  Further, from the blower 11, in order to form the lubricant layer 1b on the inner wall of the tube main body 1a, not the liquid lubricant L, in order to form a mist, not the high-pressure blow fluid A that can form irregularities on the tube main body 1a The compressed fluid A3 having a pressure that can be formed into a shape is blown (the mixing device 6 corresponds to a lubricant adhering device). Furthermore, as shown in the figure, the sealing plug 7 used to form the pressure space S and the support rod 7 engaged with the tip of the mixing device 6 are indispensable by adopting vacuum molding. Not used because it is no longer a configuration. In addition, although demonstrated as using compressed fluid A3, it is not the meaning which prevents using the blow fluid A together.

  Thus, the operation will be described as follows. First, in the same manner as in the first embodiment, the control device 8 outputs control commands to the mold driving device 9, the raw material supply device 10, the blower device 11, and the liquid feeding device 13, and the shuttle of the mold track. Operate the loop. On the other hand, the control device 8 of this embodiment also outputs a control command to the vacuum device 18. The resin material R supplied from the raw material supply apparatus 10 is extruded in the material extrusion passage 20 in substantially the same manner as in the first embodiment, and is led out to the molding surface of the molding die 91 constituting the mold track. The Then, the vacuum apparatus 18 operates the vacuum suction mechanism of the molding die 91 via the vacuum pipe 190, thereby sucking the derived resin material R onto the molding die 91. The shape of the tube body 1a is formed along the formed concave and convex portions.

At this time, in the mixing device 6, the liquid lubricant L supplied from the liquid feeding device 13 is mixed with the compressed fluid A3 supplied from the blower 11, and the mixed fluid A4 is sprayed onto the inner wall of the pipe body 1a. Then, the lubricant layer 1b is formed on the inner wall of the pipe body 1a. Thus, the flexible tube 1 provided with the lubricant layer 1b can be continuously formed according to the shuttle loop of the mold track. Since other configurations and operations are the same as those in the first embodiment, the description thereof will be omitted.
[Sixth Embodiment]
Next, another preferred embodiment will be described with reference to FIG. FIG. 8 is a cross-sectional view of a main part of the manufacturing apparatus, and a partial configuration of the mold driving device 9 and the like is shown in a block diagram. This embodiment is different from the fifth embodiment in that it has a feature that the configuration corresponding to the second embodiment is adopted, that is, the powder that supplies the powder lubricant P instead of the liquid feeding device 13. The supply device 15 is provided. The powder supply device 15 is the same as that of the second embodiment. A powder supply screw shaft is rotatably provided inside the lubricant supply path 5 and is based on a control command from the control device 8. Then, the screw shaft is rotated to send the powder lubricant P to the mixing device 6. Then, the powder lubricant P is mixed with the compressed fluid A3 by the mixing device 6 and the mixed fluid A5 is sprayed onto the inner wall of the tube body 1a, whereby the lubricant layer 1b can be formed on the inner wall. Since other configurations and operations are the same as those in the fifth embodiment, the description thereof will be omitted.
[Seventh Embodiment]
Next, another preferred embodiment will be described with reference to FIG. FIG. 9 is a cross-sectional view of a main part of the manufacturing apparatus, and a partial configuration of the mold driving device 9 and the like is shown in a block diagram. This embodiment is different from the fifth embodiment in that it has a feature in that instead of the inner lip member 3, the inside of the pipe is a supply path holding hole 30A into which the lubricant supply path 5 is fitted. An inner lip member 3A is used, and a support rod 7 is engaged with the tip of the inner lip member 3A on the mold 91 side, and the tip of the support rod 7 abuts against the inner wall of the tube body 1a. The point is that a substantially cylindrical lubricant supply portion 71A (corresponding to a lubricant adhesion device) having a truncated cone shape at the front end portion toward the inner lip member 3A side is provided. Moreover, in this embodiment, since there exists this lubricant supply part 71A, the mixing apparatus 6 is not used.

The above-mentioned support rod 7 is constituted by a hollow member, and a lubricant supply path 5 further extending from the inner lip member 3A is inserted into the hollow portion. The lubricant supply path 5 is connected to a lubricant supply path 710A provided in the lubricant supply unit 71A. A large number of lubricant supply paths 710A are formed radially in the paper surface direction (direction perpendicular to the axial direction of the tube main body 1a) from the axial center to the surface of the lubricant supply portion 71A, and the inner wall of the tube main body 1a. The liquid lubricant L is supplied to almost all of the above. Thus, since the lubricant supply part 71A is provided to leak the lubricant and adhere to the inner wall of the pipe, the long distance piping is combined with the configuration of the convex part 1ab of the inner wall of the pipe body 1a. Moreover, even when a large number of bent portions are included, good lineability can be ensured. Since other configurations and operations are the same as those in the fifth embodiment, the description thereof will be omitted.
[Eighth Embodiment]
Next, another preferred embodiment will be described with reference to FIG. FIG. 10 is a cross-sectional view of the main part of the manufacturing apparatus, and a partial configuration of the mold driving device 9 and the like is shown in a block diagram. This embodiment is different from the fifth embodiment in that it has a feature in that instead of the inner lip member 3, the inside of the pipe is a supply path holding hole 30A into which the lubricant supply path 5 is fitted. The inner lip member 3A is used, the tip of the lubricant supply passage 5 on the molding die 91 side is located in the vicinity of the throttle portion 31, and a lubricant supply passage 50 that opens to the material extrusion passage 20 is provided at the tip. Furthermore, the narrowed portion 31 closer to the molding die 91 than the lubricant supply path 50 is a lubricant lead-out portion 310 whose outer diameter is reduced in order to supply the lubricant. A large number of the lubricant supply paths 50 are formed radially in the paper surface direction (direction perpendicular to the axial direction of the tube body 1a) from the axial center of the inner lip member 3A to the surface of the throttle portion 31. The liquid lubricant L is supplied to substantially all of the inner wall of the tube body 1a before being subjected to the operation. Moreover, in this embodiment, since there is the lubricant supply path 50, the mixing device 6 is not used. Since other configurations and operations are the same as those in the fifth embodiment, the description thereof will be omitted.

It is sectional drawing which shows the structure of the flexible tube conduit tube which concerns on this invention. It is principal part sectional drawing of the manufacturing apparatus which concerns on 1st Embodiment, Comprising: A one part structure is shown with the block diagram. Fig. (A) is a cross-sectional view of the main part showing the periphery of the mixing device 6 according to the present invention, and Fig. (B) is a diagram showing an A direction arrow view of Fig. (A). It is principal part sectional drawing of the manufacturing apparatus which concerns on 2nd Embodiment, Comprising: A one part structure is shown with the block diagram. It is principal part sectional drawing of the manufacturing apparatus which concerns on 3rd Embodiment, Comprising: A one part structure is shown with the block diagram. It is principal part sectional drawing of the manufacturing apparatus which concerns on 4th Embodiment, Comprising: A one part structure is shown with the block diagram. It is principal part sectional drawing of the manufacturing apparatus which concerns on 5th Embodiment, Comprising: A one part structure is shown with the block diagram. It is principal part sectional drawing of the manufacturing apparatus which concerns on 6th Embodiment, Comprising: A one part structure is shown with the block diagram. It is principal part sectional drawing of the manufacturing apparatus which concerns on 7th Embodiment, Comprising: A one part structure is shown with the block diagram. It is principal part sectional drawing of the manufacturing apparatus which concerns on 8th Embodiment, Comprising: A one part structure is shown with the block diagram. FIG. 1A is a cross-sectional view of a corrugated tube continuous extrusion blow molding machine, and FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Pipe body 1aa Concave part 1ab Convex part 1b Lubricant layer 10 Raw material supply apparatus (equipped with heating means)
16 Blow fluid supply unit (pressing device)
17 Blow fluid supply unit (pressing device)
2 Nozzle (die nozzle)
20 Material extrusion passage 50 Lubricant supply passage (lubricant adhesion device)
6 Mixing device (lubricant adhering device, also serving as a pressing device in the first and second embodiments)
71 Seal plug (lubricant adhesion device)
71A Seal plug (lubricant adhesion device)
90 Mold 91 Mold (Pressure reducing mechanism is equivalent to pressing device)

Claims (1)

  A flexible conduit that is piped in advance and through which an electric wire or cable is passed, has a tube body made of a synthetic resin material of polypropylene, polyethylene, hard vinyl chloride, or polyamide, on the inner wall of the tube body Has a plurality of concave portions and convex portions that are substantially wavy in cross-section in the axial direction, and the convex portions include a liquid lubricant or a four-fluid made of silicone oil that reduces the frictional force with the electric wire or cable. A flexible conduit characterized by adhering a powder lubricant composed of any one of ethylene fluoride, talc, fatty acid amide, and molybdenum dioxide.

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