The present invention relates to a flexible tube provided with a conductive wire such as a ground wire inside.
Background technology
[0002]
　Conventionally, as this kind of flexible tube, a reinforcing layer and a ground wire are provided between an inner layer and an outer layer formed of polyurethane, and the ground wire is spirally wound and embedded in a hose layer. There is a blast hose made of a cleaning material that eliminates static electricity and prevents static electricity from being charged inside the hose by protruding the end of the ground wire from the end of the hose and electrically connecting it (for example, patented). See Document 1).
Prior art literature
Patent documents
[0003]
Patent Document 1: Jikken 07-004122 Gazette
Outline of the invention
Problems to be solved by the invention
[0004]
　By the way, in order to project the end of the ground wire from the end of the hose and make a ground connection, it is necessary to take out only the ground wire from the end of the hose using nippers or scissors.
　However, in such a conventional flexible tube, since the ground wire is embedded in the hose layer, the constituent material (polyurethane) of the hose layer must be removed from the periphery of the ground wire, and this separation work is performed. There was a problem that it was difficult and it took time to separate.
　In particular, when the ground wire is embedded between the inner surface layer and the outer surface layer constituting the hose layer, the inner surface layer and the outer surface layer are firmly adhered so as not to be peeled off. Some polyurethane was stuck to the ground wire, making it very difficult to remove the polyurethane from the surface of the ground wire. When I tried to forcibly remove the polyurethane from the surface of the ground wire, the ground wire was sometimes torn off at the same time.
　In order to prevent this, if you try to remove the polyurethane stuck to the surface of the ground wire to the last minute using scissors or nippers, you may accidentally cut the ground wire, so you can easily take out the ground wire. could not.
Means to solve problems
[0005]
　In order to solve such a problem, the flexible tube according to the present invention is a flexible tube in which the tip of a conductive wire provided in the layer of the tube body protrudes from the end surface of the tube body and is electrically connected. The tube body is continuously formed in the axial direction, and the conductive wire provided in the layer of the tube body in the axial direction and having the tip portion protruding from the end face of the tube body. Around the conductive wire, the layer of the tube body and a coating layer formed of a non-adhesive material are provided, and the coating layer is arranged at a boundary surface between the layer of the tube body and the conductive wire. It is characterized by that.
A brief description of the drawing
[0006]
FIG. 1 is an explanatory view showing an overall configuration of a flexible tube according to an embodiment of the present invention, and is a perspective view after taking out a conductive wire.
[Fig. 2] It is a perspective view at the time of cutting.
Embodiment for carrying out the invention
[0007]
　Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
　In the flexible tube A according to the embodiment of the present invention, as shown in FIGS. 1 to 2, the tip portion 2a of the conductive wire 2 provided in the layer of the tube body 1 is projected from the end surface 1a of the tube body 1. , The tip portion 2a of the conductive wire 2 is electrically connected to a conductor (not shown) such as a pipe joint.
　More specifically, the flexible tube A according to the embodiment of the present invention includes a tube body 1 continuously formed in the axial direction, a conductive wire 2 provided in a layer of the tube body 1, and a periphery of the conductive wire 2. The coating layer 3 formed in the above is provided as a main component.
　Further, it is preferable to provide the reinforcing wire 4 provided in the layer of the pipe body 1.
[0008]
　The flexible pipe A is cut to an appropriate length according to the purpose of use, and is piped by connecting both ends in the axial direction thereof.
　The tube body 1 of the flexible tube A is made of a soft synthetic resin such as vinyl chloride or polyurethane, or a flexible material such as silicone rubber or other rubber, and is formed into a tubular shape that can be deformed. It is a tube with sex.
　The tube body 1 is formed in a multi-layer structure, a multi-layer structure, or a single-layer structure having a plurality of layers overlapping in the radial direction.
　As a method for manufacturing the tube body 1, it is preferable to form a layer by extrusion molding, co-extrusion molding or the like.
　In the case shown in FIGS. 1 to 2 as a specific example of the tube main body 1, it is a two-layer structure having an inner layer 11 and an outer layer 12. In the case of the illustrated example, the inner layer 11 and the outer layer 12 made of a soft material such as a transparent or translucent soft synthetic resin or silicone rubber are laminated and integrated by extrusion molding or the like.
　A conductive wire 2, a covering layer 3, and a reinforcing wire 4, which will be described later, are arranged between the inner layer 11 and the outer layer 12.
　Further, although not shown as another example, the pipe body 1 may be changed to a multi-layer structure or a single-layer structure having three or more layers instead of the two-layer structure, formed of an opaque soft material, and the inner layer 11 and the outer layer 12 may be formed. It is possible to make changes such as arranging only the conductive wire 2 and the coating layer 3 described later between the two.
[0009]
　The conductive wire 2 is made of a conductive material having electrical conductivity and is formed so as to be continuous in the axial direction of the tube body 1, and has tip portions 2a protruding from the end surface 1a of the tube body 1 on both sides in the axial direction thereof. ..
　That is, when the flexible tube A is cut, the tip portion 2a of the conductive wire 2 is operated so as to protrude by a predetermined length from the end surface 1a of the tube body 1.
　As a specific example of the conductive wire 2, a metal fiber, a twisted yarn of a metal foil, a metal wire, or the like is used.
　The tip portion 2a of the conductive wire 2 protruding from the end surface 1a of the pipe body 1 is electrically connected to a conductor (not shown) such as a pipe joint, so that the conductive wire 2 can be used as a ground wire or other electric wire. It will be possible to use it.
[0010]
　The coating layer 3 is made of a non-adhesive material with the layer of the tube body 1, and is formed on the surface 2b of the conductive wire 2 at the boundary surface between the layer of the tube body 1 and the conductive wire 2 and is formed in the layer of the tube body 1. It is embedded and placed.
　Examples of the non-adhesive material to the layer (soft material such as soft synthetic resin or silicone rubber) of the tube body 1 constituting the coating layer 3 include a silicone-based or non-silicone-based release agent, a silicone-based or fluorine-based release agent. Molds, silicones, mineral oils, or similar materials, or a combination of these, etc. are used. As a result, the frictional force (friction resistance) of the surface 2b of the conductive wire 2 with respect to the soft material constituting the layer of the tube main body 1 is reduced, and the non-adhesiveness of both and the slidability of the conductive wire 2 are imparted.
　Further, in the case of a multi-layer structure or a multi-layer structure in which the tube body 1 has a plurality of layers, a conductive wire 2 covered with a non-adhesive material to be a coating layer 3 is embedded between the plurality of layers to be the tube body 1. It is preferable to do so. In this case, it is preferable to use a fluidable liquid or the like as the non-adhesive material to be the coating layer 3. In particular, a liquid material having a high viscosity (viscosity) such as silicone oil is preferable.
　That is, in the method for manufacturing the flexible tube A according to the embodiment of the present invention, the surface 2b is formed by a treatment such as applying or impregnating the surface 2b of the conductive wire 2 with a non-adhesive material to be the coating layer 3. It is preferable to embed the conductive wire 2 in a state of being covered with a non-adhesive material between a plurality of layers.
　When the conductive wire 2 and the coating layer 3 are embedded between a plurality of layers (inner layer 11 and outer layer 12) as shown in the illustrated example, a plurality of non-adhesive materials to be the coating layer 3 are provided with the surface 2b of the conductive wire 2. It is preferable that the layers (inner layer 11 and outer layer 12) are in close contact with each other. As a result, the liquid is waterproofed so as not to enter between the plurality of layers (inner layer 11 and outer layer 12) from the end surface 1a of the cut pipe body 1 to prevent peeling.
[0011]
　As the reinforcing wire 4, materials harder than the material constituting the layer of the pipe body 1, for example, reinforcing threads 4a and 4b made of synthetic resin fibers such as polyester, nylon (registered trademark) and aramid are mainly used.
　The reinforcing threads 4a and 4b include a multifilament made by twisting a plurality of fine synthetic resin fibers, a monofilament made of one synthetic resin fiber, and a flat made of a tape-shaped synthetic resin fiber. There are yarns (or tape yarns) and the like.
　When the reinforcing wire 4 is embedded between a plurality of layers (inner layer 11, outer layer 12) as shown in the illustrated example, after the conductive wire 2 is arranged in addition to the reinforcing wire 4, the adhesive is spray-coated or dip. It is preferable to apply it by a known means such as coating to bring it into close contact with a plurality of layers (inner layer 11, outer layer 12).
　As a result, the liquid is transmitted from the end surface 1a of the cut pipe body 1 through the conductive wire 2 and the reinforcing wire 4 to prevent the liquid from infiltrating between the plurality of layers (inner layer 11 and outer layer 12) to prevent peeling. Further, the plurality of layers (inner layer 11 and outer layer 12) are firmly adhered to each other by the applied adhesive.
[0012]
　The arrangement direction of the conductive wire 2, the covering layer 3 and the reinforcing wire 4 may be spirally wound in the axial direction of the pipe body 1, or linearly arranged in the axial direction of the pipe body 1.
　The spiral winding form of the conductive wire 2, the covering layer 3 and the reinforcing wire 4 includes a single-row winding in which one unit is spirally wound at a predetermined pitch in the axial direction of the pipe body 1, and a plurality of sets separated in the axial direction. There is a double-row winding that spirally winds at a predetermined pitch.
　As a manufacturing method for arranging the conductive wire 2, the coating layer 3 and the reinforcing wire 4 with respect to the tube main body 1, the conductive wire 2 and the coating are simultaneously formed at the same time as the layer of the tube main body 1 by extrusion molding or coextrusion molding. It is preferable to wind the layer 3 and the reinforcing wire 4 in a spiral shape.
　In particular, when the conductive wire 2, the covering layer 3 and the reinforcing wire 4 are spirally wound, it is preferable to set the inclination angle of the conductive wire 2, the covering layer 3 and the reinforcing wire 4 with respect to the axis of the pipe body 1 to be small.
　Generally, the ideal inclination angle between the conductive wire 2 and the covering layer 3 and the reinforcing wire 4 is about 109 degrees, but as a specific example, it is preferably about 80 to 100 degrees, more preferably 85 to 95 degrees. On the other hand, when the inclination angle of the conductive wire 2, the covering layer 3 and the reinforcing wire 4 is less than 85 degrees, the expansion and contraction of the flexible tube A becomes large when the pressure fluctuates. Further, when the inclination angle of the conductive wire 2 and the covering layer 3 and the reinforcing wire 4 exceeds 95 degrees, it becomes difficult to take out the conductive wire 2.
[0013]
　In the cases shown in FIGS. 1 and 2 as specific examples of the conductive wire 2, the covering layer 3, and the reinforcing wire 4, a plurality of reinforcing threads 4a and 4b having opposite spiral winding directions are designated as the reinforcing wire 4 in the axial direction. It is wound while shifting at the pitch. As a result, a reinforcing layer (net-like blade structure) braided in a spiral shape is formed between the inner layer 11 and the outer layer 12. By replacing any of the reinforcing threads 4a and 4b with the conductive wire 2 and the coating layer 3, the conductive wire 2 and the coating layer 3 are spirally wound.
　Further, although not shown as another example, it is possible to change the net-like blade structure as a reinforcing layer by replacing it with a multifilament, a monofilament, or a flat yarn, or by replacing it with a knitted knitting structure.
[0014]
　Next, in the flexible tube A according to the embodiment of the present invention, the tube main body 1 is cut except for the conductive wire 2, and the tip portion 2a of the conductive wire 2 provided in the layer of the tube main body 1 is attached to the tube main body 1. A method of projecting from the end surface (cut surface) 1a will be described.
　In the cutting method shown in FIG. 2, a portable tube cutting tool B is used.
　The tube cutting tool B has a structure similar to that of a conventionally known nipper. That is, the pipe cutting tool B includes a pair of cutting blades B1 provided facing each other so as to sandwich the flexible pipe A (tube main body 1) in the radial direction, and a joint portion B2 that movably supports the pair of cutting blades B1. , A grip portion (not shown) continuously formed on the pair of cutting blades B1 is provided as a main component.
　The pair of cutting blades B1 are set to have a width dimension longer than the outer diameter dimension of the pipe body 1 and the width dimension when the pipe body 1 is crushed smoothly by the pair of cutting blades B1. It has a concave portion B3 for cutting only a portion other than the line 2.
[0015]
　The method of cutting the flexible pipe A according to the embodiment of the present invention with the pipe cutting tool B includes a setting step of positioning the pair of cutting blades B1 toward the conductive wire 2 of the pipe body 1 and a pair of cutting blades B1. The main steps include a cutting step of moving the tube body 1 closer in the radial direction and a separating step of pulling out the tip portion 2a of the conductive wire 2 from the unnecessary tube body 1'cut and separated from the tube body 1.
　In the setting process, as shown in FIG. 2, the operator applies the concave portion B3 of the pair of cutting blades B1 to the pipe body 1 in which the conductive wire 2 is embedded in a spiral or linear shape in the axial direction. Position the pipe 2 and the pipe body 1 so as to face each other in the radial direction, and temporarily fix the pipe cutting tool B so as not to shift the position.
　In the cutting step, the operator moves the pair of cutting blades B1 close to each other in the radial direction of the pipe body 1 and sandwiches the pipe body 1 between the pair of cutting blades B1. As a result, the tube body 1 is cut so that it can be separated.
　In the separation step, the operator separates and moves the unnecessary pipe body 1'cut from the end surface 1a of the pipe body 1 in the axial direction of the pipe body 1 after cutting the pipe body 1. As a result, the tip portion 2a of the conductive wire 2 is pulled out from the coating layer 3'exposed on the end surface (cut surface) 1a'of the separated unnecessary tube body 1'.
　At this time, when the conductive wire 2 and the coating layer 3 are spirally wound, the smaller the inclination angle of the conductive wire 2 and the coating layer 3 with respect to the axis of the tube body 1, the smaller the inclination angle of the conductive wire 2 and the coating layer 3 in the axial direction of the coating layer 3 and the conductive wire 2. The frictional force (friction resistance) of the conductive wire 2 is reduced, and it becomes easy to pull out the cut unnecessary covering layer 3'of the tube body 1'from the tip portion 2a of the conductive wire 2.
[0016]
　According to the flexible tube A according to the embodiment of the present invention, the conductive wire 2 is electrically conductive with respect to the layer of the tube body 1 as in the case where the conductive wire 2 is spirally wound in the axial direction in the layer of the tube body 1. Even if the wire 2 is integrally provided, the conductive wire 2 is arranged in a non-adhesive state with the coating layer 3 sandwiched on the boundary surface with the layer of the tube body 1.
　Therefore, as shown in FIGS. 1 and 2, an unnecessary tube cut and separated by cutting the layer of the tube body 1 with a tube cutting tool B or the like so that the conductive wire 2 is removed and pulling it apart in the axial direction. The tip portion 2a of the conductive wire 2 can be smoothly pulled out from the coating layer 3'of the main body 1'. Along with this separation, only the tip portion 2a of the conductive wire 2 provided in the layer of the tube body 1 protrudes from the end surface (cut surface) 1a of the tube body 1.
　Therefore, the tip portion 2a of the conductive wire 2 can be easily taken out from the layer of the tube body 1.
　As a result, as compared with the conventional one in which the ground wire is embedded in the hose layer, the layer constituent material of the tube body 1 and the conductive wire 2 can be reliably separated without being cut, and the separation work is not troublesome and the workability is excellent.
[0017]
　In particular, the tube body 1 has a plurality of layers (inner layer 11, outer layer 12) overlapping in the radial direction, and is covered with a non-adhesive material serving as a coating layer 3 between the plurality of layers (inner layer 11, outer layer 12). It is preferable to embed the conductive wire 2.
　In this case, as in the case where the conductive wire 2 is spirally wound in the axial direction between the plurality of layers (inner layer 11, outer layer 12), the conductive wire is wound around the plurality of layers (inner layer 11, outer layer 12). Even if 2 is integrally provided, the conductive wire 2 is arranged in a non-adhesive state with the coating layer 3 sandwiched between the plurality of layers (inner layer 11 and outer layer 12).
　Therefore, as shown in FIGS. 1 and 2, a plurality of layers (inner layer 11 and outer layer 12) are cut by a tube cutting tool B or the like so that the conductive wire 2 is removed and separated in the axial direction. The tip portion 2a of the conductive wire 2 can be smoothly pulled out from the coating layer 3'of the separated unnecessary tube body 1'. Along with this separation, only the tip portion 2a of the conductive wire 2 provided between the plurality of layers (inner layer 11, outer layer 12) protrudes from the end surface (cut surface) 1a of the tube body 1.
　Therefore, the tip portion 2a of the conductive wire 2 can be easily taken out from the layer of the tube main body 1 without lowering the adhesive strength of the plurality of layers (inner layer 11, outer layer 12).
　As a result, even if the pressure of the fluid passing through the pipe body 1 rises, the plurality of layers (inner layer 11 and outer layer 12) do not peel off, and excellent pressure resistance can be maintained.
　Further, even when the conductive wire 2 and the reinforcing wire 4 are arranged between the plurality of layers (inner layer 11, outer layer 12) and then adhered to the plurality of layers (inner layer 11, outer layer 12) with an adhesive, the pipe cutting tool B or the like is used. By cutting the conductive wire 2 so as to be removed and pulling it apart in the axial direction, only the tip portion 2a of the conductive wire 2 protrudes from the end surface (cut surface) 1a of the tube body 1 and can be easily taken out.
[0018]
　Further, it is preferable that the non-adhesive material to be the coating layer 3 is liquid.
　In this case, the conductive wire 2 whose surface 2b is covered with a non-adhesive liquid material as the coating layer 3 is extruded and placed on the interface between the layer of the tube body 1 and the conductive wire 2 to be conductive. A coating layer 3 made of a non-adhesive liquid material is formed around the wire 2.
　Therefore, the covering layer 3 can be easily created.
　As a result, the manufacturing speed can be increased and the manufacturing cost can be reduced.
[0019]
　In the illustrated embodiment of the above embodiment, the pipe body 1 has a two-layer structure of an inner layer 11 and an outer layer 12, but is not limited to this, and has a multi-layer structure of three or more layers having an innermost layer and an outermost layer. May be good.
　Further, the reinforcing wire 4 is provided in the layer of the pipe body 1, but the present invention is not limited to this, and the reinforcing wire 4 may be omitted.
　Further, the flexible tube A is cut by a portable tube cutting tool B, but the tube body 1 is cut by a non-portable installation type cutting device except for the conductive wire 2. May be changed to.
Description of the sign
[0020]
　A Flexible tube 1 Tube body
　1a End face 11, 12 Multiple layers (inner layer, outer layer)
　2 Conductive wire 2a Tip
　3 Cover layer
The scope of the claims
[Claim 1]
　A tube body formed continuously in the
　axial direction, a conductive wire provided in the layer of the tube body in the axial direction and having a tip portion protruding from the end surface of the tube body, and the
　tube around the conductive wire. The
　flexible body comprises a layer of the main body and a coating layer formed of a non-adhesive material, wherein the coating layer is arranged at a interface between the layer of the tube body and the conductive wire. tube.
[Claim 2]
　Claim 1 is characterized in that the tube main body has a plurality of layers overlapping in the radial direction, and the conductive wire covered with a non-adhesive material serving as a coating layer is embedded between the plurality of layers. The flexible tube described.
[Claim 3]
　The flexible tube according to claim 1 or 2, wherein the non-adhesive material to be the coating layer is liquid.