JP5912301B2 - Synthetic resin hose and its manufacturing method - Google Patents

Description

  The present invention relates to a flexible synthetic resin hose having a joint end for mounting a synthetic resin mouth member on both ends and a method of manufacturing the same.

  Conventionally, as described in Patent Document 1, for example, as a flexible synthetic resin hose used as a drainage hose for a washing machine, a kitchen sink or the like, the inner peripheral surface extends over the entire length. A hard synthetic resin reinforcing wire material such as polypropylene or polyethylene is spirally wound at a constant pitch around the outer peripheral surface of a soft synthetic resin tube wall such as soft vinyl chloride resin formed on a smooth surface of the same diameter. In addition, a synthetic resin hose obtained by covering the hard synthetic resin reinforcing wire with a soft synthetic resin hollow spiral ridge wall is widely known.

  In order to manufacture such a flexible synthetic resin hose, a belt-like material is formed by extruding a semi-molten soft synthetic resin strip having a certain width from a molding nozzle and winding it on a molding rotating shaft. When forming the tube wall by spirally winding the other side portion of the belt-shaped material portion to be wound next on one side portion of the material portion while being spirally wound, The above-mentioned hard synthetic resin reinforcing wire is spirally wound at the same pitch on the above-described belt-shaped material portion having a constant diameter, and then the hard synthetic resin reinforcing wire is wound next. By covering with the strip-shaped material portion to be wound, the above-mentioned soft synthetic resin hollow spiral ridge wall is formed by the strip-shaped material portion.

  Furthermore, in this patent document 1, the synthetic resin which integrally provides the enlarged diameter mouth part which made the said soft synthetic resin pipe wall thick at both ends, and formed the inner peripheral surface in the smooth surface. In order to manufacture such a hose, a predetermined length is obtained by coating a hard synthetic resin reinforcing wire spirally wound around a pipe wall with a soft synthetic resin hollow spiral ridge wall. The step of forming the hose, and subsequently, following this step, a cylindrical diameter-expanded mouth portion forming member is placed on the rotation axis of the molding to increase the diameter of the soft synthetic resin tube wall. Alternately forming a diameter-expanded short tube portion having a length twice that of the mouth portion, and embedding in the outer peripheral portion of the diameter-expanded short tube portion while forming the hard synthetic resin reinforcing wire to a small diameter While performing the above, both of the above-mentioned It manufactures synthetic resin hose having a diameter mouth portion parts.

JP 2002-286172 A

  When the above-mentioned expanded diameter mouth part is integrally provided at both ends of a flexible synthetic resin hose, use the expanded diameter mouth part as it is as a joint member with another pipe or hose. However, there is a problem that it can only be used for connection with a pipe or hose having a diameter corresponding to the diameter of the enlarged diameter base portion. Therefore, as shown in FIG. As shown in FIG. 12, a synthetic resin port member 5 having a desired diameter is attached to the opening end of the synthetic resin hose A ′ that does not have such an enlarged diameter base portion.

  The mouth member 5 has inner and outer short cylindrical portions 5b and 5c projecting in parallel from each other toward the rear at the inner and outer peripheral edges of the annular plate portion 5a to be brought into contact with the opening end surface of the synthetic resin hose A '. In addition, a cylindrical mouth portion 5d having a diameter corresponding to the diameter of the pipe or hose to be connected to the front surface of the annular plate portion 5a and a mouth portion serving as a drain port are provided so as to protrude from the inner and outer short tube portions 5b, 5c. Is attached to the inner and outer peripheral surfaces of the opening end of the synthetic resin hose A ', and the outer peripheral surface of the inner short tube portion 5b is adhered to the inner peripheral surface of the tube wall of the opening end of the synthetic resin hose A'. ing.

  At this time, in order to firmly bond and integrate the tube wall 1 of the synthetic resin hose A ′ and the inner short cylindrical portion 5b of the mouth member 5, the tube wall 1 and the mouth member 5 of the synthetic resin hose A ′ are joined together. In order to give excellent flexibility to the synthetic resin hose A ′, the synthetic resin hose A ′ is used as the hard synthetic resin reinforcing wire 2 while being formed from a vinyl chloride resin having good adhesiveness. It is made of olefin resin such as polypropylene and polyethylene, which is difficult to bond with the soft virgin chloride resin hollow spiral ridge wall 3 in which the soft virgin chloride resin pipe wall 1 and the hard synthetic resin reinforcing wire 2 are installed. ing.

  However, when a long synthetic resin hose configured in this way is cut into desired lengths to obtain the predetermined length of the synthetic resin hose A ′, as shown in FIG. A predetermined arc length portion is cut in the circumferential direction together with the hard synthetic resin reinforcing wire 2 housed in the spiral rib wall 3 and the hollow spiral rib wall 3 is formed on the cut end surface of the hose A ′. The cut opening is greatly opened in an arc shape, and the arc-shaped cut end portion 2-1 of the hard synthetic resin reinforcing wire 2 protrudes from the opening portion 4 as shown in FIG. There is a problem in that it is difficult to attach the mouth member 5 to the part.

  Further, when the mouth member 5 is made of a soft vinyl chloride resin, the mouth member 5 is attached to the cut end portion of the synthetic resin hose A ′ as described above. The inner short cylindrical portion 5b of the mouth member 5 inserted into the peripheral surface is pressed by the arcuate cut end portion 2-1 of the hard synthetic resin reinforcing wire 2 so as to be indented and deformed. There is a risk of fluid leaking out. Therefore, the arc-shaped cut end 2-1 of the hard synthetic resin reinforcing wire 2 protruding from the cut end face of the synthetic resin hose A ′ has to be cut off with a cutter or the like.

  The present invention has been made in view of such problems, and the purpose thereof is a joint that can easily and accurately attach a mouth member without a rigid synthetic resin reinforcing wire protruding from an end face. It is in providing the manufacturing method which can manufacture efficiently the synthetic resin hose which has an end part for use, and this synthetic resin hose.

In order to achieve the above object, the synthetic resin hose according to the present invention is a soft vinyl chloride resin tube having an inner peripheral surface formed on a smooth surface of the same diameter over the entire length as described in claim 1. An olefin-based hard synthetic resin reinforcing wire is spirally wound around the outer peripheral surface of the wall at a constant pitch, and this hard synthetic resin reinforcing wire is covered with a hollow helical rib wall made of soft vinyl chloride resin. In the synthetic resin hose in which both ends of the synthetic resin hose are provided with joint ends, the joint ends are wound around the outer peripheral surface of the tube wall portion obtained by extending the soft vinyl chloride resin tube wall . The rigid synthetic resin reinforcing wire is reduced in diameter, and the helical pitch of the small-diameter hard synthetic resin reinforcing wire is expanded and bent in the length direction of the hose. And this bend reinforcing wire part The end portion of the bent reinforcing wire portion covered with the hollow bent ridge wall portion faces the extending direction of the hose from the open end surface of the synthetic resin hose. It is characterized by that.

Further, the invention according to claim 2 is the reinforcing wire provided on the tube wall portion at the end portion for both ends joint of the hose main body, the tube wall of the hose main body on the base portion of the tube wall portion connected to the hose main body side. The reinforcing wire made of a hard synthetic resin that is spirally wound around the outer peripheral surface is wound in a spiral shape several times with a smaller diameter than the hard synthetic resin made of reinforcing wire made of a hard synthetic resin. A bent reinforcing wire portion that is bent in the length direction of the hose by moving the reinforcing wire portion connected to the several spirally wound reinforcing wire portions in the direction of expanding the helical pitch is disposed at the tip portion. It is characterized by.

The invention according to claim 3 is a method for producing the synthetic resin hose, wherein a semi-molten soft vinyl chloride resin belt-like material is polymerized and fused on a molding rotating shaft at a constant pitch and spirally wound. As a result, a tube wall having the same inner diameter is formed over the entire length, and a reinforcing wire made of a semi-molten olefin-based hard synthetic resin is spirally wound around the tube wall at a constant pitch, And, forming the hose main body of a certain length while forming a hollow spiral rib wall with the reinforcing wire by covering the reinforcing wire with a strip material made of soft vinyl chloride resin in a semi-molten state, Continuously after the hose-based molding process, a tube wall portion is formed by extending the tube wall by spirally winding the semi-molten soft vinyl chloride resin strip at the same pitch on the molding rotating shaft. Shi Reluctant, the length of the hose by expanding the helical pitch with the semi-hard synthetic resin reinforcing wire member in a molten state and diameter of the hard synthetic resin reinforcing wire member of the small-diameter feeding on an outer peripheral surface of the tube wall A bent bending reinforcing wire portion is formed, and the bending reinforcing wire portion is covered with the above-mentioned semi-molten soft vinyl chloride resin belt-like material to form a hollow bent ridge wall portion including the bending reinforcing wire portion. The step of alternately forming a short pipe portion for a joint having a certain length by providing a bending reinforcing wire portion covered with the hollow bent ridge wall portion on the tube wall portion is followed by the hose main body. Then, by sequentially cutting the central portion in the length direction of the joint short pipe portion fed out from the molding rotating shaft, the joint for the joint composed of the divided portion of the joint short pipe portion at both ends of the hose main body To obtain a hose with an end. The features.

Furthermore, the invention according to claim 4 is the invention on the tube wall portion of the joint short tube portion in which the rigid synthetic resin reinforcing wire spirally wound on the tube wall mainly composed of the hose is continuously formed on the tube wall mainly composed of the hose. The hard synthetic resin reinforcing wire is formed into a small diameter and the small diameter hard synthetic resin reinforcing wire is spirally wound several times with a constant pitch at both ends in the longitudinal direction of the tube wall. The hose length direction is formed by moving the small-diameter hard synthetic resin reinforcing wire in the direction of expanding the helical pitch in the middle portion of the tube wall portion between the helical reinforcing wire portions. It is characterized in that it is formed in a bent reinforcing wire portion that is bent into two.

  According to the first aspect of the present invention, the olefin-based hard synthetic resin reinforcing wire is spirally wound at a constant pitch on the outer peripheral surface of the soft vinyl chloride resin tube wall, and the hard synthetic resin In a synthetic resin hose main body formed by covering a reinforcing wire with a hollow wall of a soft vinyl chloride resin, a rigid synthetic resin reinforcing wire wound around the outer peripheral surface of each end of the hose main body. A hollow bending protrusion in which a bending reinforcing wire portion formed by expanding the helical pitch and bending in the length direction of the hose is formed, and the bending reinforcing wire portion is bent straight in the length direction of the hose along the bending reinforcing wire portion. Since the end portion for the joint formed by covering with the strip wall portion is formed, the opening end of the hollow bent ridge wall portion extends from the opening end surface of the joint end portion of the hose toward the length direction of the hose. With an opening area equal to the shape In this state, the bending reinforcing wire portion faces the end surface with the opening end facing the extension direction of the hose from the opening end, and accordingly, the bending reinforcing wire rod extends from the opening end of the hollow bending ridge wall portion. The end portion for a joint in which the bent reinforcing wire portion is housed can be constituted by the hollow bent protrusion wall portion without protruding the portion, and a mouth member having a desired diameter can be easily formed at the end portion for the joint. And it can attach correctly.

Furthermore, according to the invention which concerns on Claim 1 , the diameter of the rigid synthetic resin reinforcement wire which spirally winds the said bending reinforcement wire part provided on the tube wall part of the edge part for joints around the tube wall of a hose main body. Therefore, the elastic restoring force of the bending reinforcing wire portion can be reduced, and thus the protrusion from the end surface of the joint end can be more reliably prevented and the outer peripheral surface can be prevented. A part of the tube wall portion where the bent reinforcing wire portion is disposed can be held in a circular shape with almost no deformation by the bent reinforcing wire portion. It can be attached to the end part for precision.

Moreover, according to the invention according to claim 2, in the reinforcing wire provided on the both end tube wall portions of the hose main body, the tube wall outer periphery of the hose main body is formed on the base portion of the tube wall portion connected to the hose main body side. The reinforcing wire made of a hard synthetic resin that is spirally wound on the surface is wound spirally several times with a smaller diameter than that of the hard synthetic resin made of reinforcing wire made of hard synthetic resin. The part is formed with a bent reinforcing wire part bent in the length direction of the hose by moving the reinforcing wire part connected to the several reinforcing wire parts spirally wound in the direction of expanding the helical pitch. At the tip of the tube wall portion at the joint end, the bent reinforcing wire portion is disposed only in a part of the outer peripheral surface in the length direction of the hose. On the base of the pipe wall, the hose-based pipe wall Since the reinforcing wire made of a hard synthetic resin that is spirally wound around the peripheral surface is wound in a spiral shape several times smaller than the hard synthetic resin reinforcing wire, the helical shape The tube portion of the end portion for the joint can be held in a circular cross section over the entire length by the reinforcing wire portion wound around, so that the end portion for the joint with high accuracy can be configured.

The invention according to claim 3 is the production of the synthetic resin hose described above, in which a semi-molten soft vinyl chloride resin belt-shaped material is spirally wound at a constant pitch while being polymerized and fused on a molding rotating shaft. In this way, a tube wall having the same inner diameter is formed over the entire length, and a reinforcing wire made of a semi-molten olefin-based hard synthetic resin is spirally wound around the tube wall at a constant pitch, and A step of forming a hose main body of a predetermined length while forming a hollow spiral ridge wall in which the reinforcing wire is embedded by coating the reinforcing wire with a strip material made of soft polyvinyl chloride resin in a semi-molten state, and the above molding While forming a tube wall portion in which the tube wall is extended by spirally winding the semi-molten soft vinyl chloride resin strip with the same pitch on the rotating shaft, the outer peripheral surface of the tube wall portion Hard synthesis A bending reinforcement wire portion is formed by bending a fat reinforcement wire in the length direction of the hose by expanding the helical pitch, and the bending reinforcement wire portion is covered with the semi-molten soft synthetic resin strip. Then, a joint having a certain length is provided by forming a hollow reinforcing rib wall portion covered with the hollow bending protrusion wall portion on the tube wall portion by forming a hollow bending protrusion wall portion having the bending reinforcing wire portion housed therein. While alternately performing the process of forming the short pipe portion for the pipe, the central portion in the length direction of the short pipe portion for the joint fed from the forming rotating shaft is sequentially cut. A flexible synthetic resin hose having a joint end formed by equally dividing the joint short-pipe portion at both ends can be manufactured continuously and efficiently. Reduction can be achieved.

  Furthermore, since the hose main body and the joint short pipe part are alternately molded on the molding rotating shaft, a synthetic resin hose having a smooth surface having the same inner diameter over the entire length is manufactured. Of course, an olefin-based hard synthetic resin reinforcing wire is wound around a tube wall made of a soft vinyl chloride resin, and this reinforcing wire is covered with a hollow spiral ridge wall made of a soft vinyl chloride resin. The reinforcing wire can be installed in the hollow spiral ridge wall without adhering to the tube wall or hollow spiral ridge wall. It is also possible to manufacture a soft synthetic resin hose that can prevent crushing deformation due to the reinforcing core wire.

  In addition, the short pipe part for joints formed alternately with the hose main body on the molding rotary shaft forms a pipe wall part by spirally winding a semi-molten soft vinyl chloride resin strip at the same pitch. On the outer peripheral surface of the tube wall portion, however, a bent reinforcing wire portion obtained by bending a olefin-based hard synthetic resin reinforcing wire spirally wound on the hose-based tube wall in the hose length direction by expanding the helical pitch. And forming the hollow bent ridge wall portion with the bent reinforcing wire portion covered by covering the bent reinforcing wire portion with a semi-molten soft vinyl chloride resin strip. When this synthetic short tube part is divided into two parts to obtain a synthetic resin hose having joint end parts at both ends, a refractive reinforcing wire part bent in the length direction with respect to the circumferential direction of the hose is internally provided The hollow bent ridge wall It is cut in a direction substantially perpendicular to the vertical direction, and the opening end surface of the joint end portion is opened in a small direction toward the length of the hose without expanding in an arc shape in the circumferential direction of the hose. Therefore, it is possible to obtain the end portion for the joint that is housed in the hollow bent ridge wall portion without the cut end portion of the refractive reinforcing wire portion protruding from the open end of the hollow bent ridge wall portion. it can.

Moreover, hose lengthwise by feeding the hard synthetic resin reinforcing wire coiling to the tube wall of the hose main body on the tube wall of the coupling short pipe section formed successively on the tube wall of the hose main body Since the rigid synthetic resin reinforcing wire is formed to have a small diameter when forming the bent reinforcing reinforcing wire portion, the rigid synthetic resin reinforcing wire is bent in the length direction of the hose quickly and reliably. A reinforcing wire portion that is oriented in the length direction larger than the hose circumferential direction can be formed in the length portion of the hose, and the elastic restoring force of the reinforcing wire portion can be reduced, so that the end of the joint Jumping out from the end face can be surely prevented, and an end portion for a joint which is unlikely to deform a part of the tube wall portion by the bent reinforcing wire portion can be obtained.

According to the invention of claim 4 , the pipe wall of the short pipe part for joints is formed by continuously forming the hard synthetic resin reinforcing wire spirally wound on the pipe wall mainly composed of the hose on the pipe wall mainly composed of the hose. When supplying on the part, this rigid synthetic resin reinforcing wire is molded into a small diameter and the small diameter rigid synthetic resin reinforcing wire is several times at a constant pitch at both ends in the length direction of the tube wall, A spiral reinforcing wire portion is formed by spiral winding, and in the middle portion of the tube wall portion between the spiral reinforcing wire portions, the length of the hose is increased by moving the small-diameter hard synthetic resin reinforcing wire in the direction of expanding the helical pitch. Since it is formed in a bent reinforcing wire part bent in the vertical direction, the tube wall part of the short pipe part for joints is formed by a small diameter rigid synthetic resin reinforcing wire spirally wound on the base side of the short pipe part for joints. Maintain a circular cross-section over the entire length It can be, it is possible to obtain an end for accurate fitting.

The simplified side view which carried out the cross section of a part of this invention synthetic resin hose. The enlarged vertical side view of the one end part. The enlarged vertical front view of the opening edge part. The vertical side view of the state which attached the mouth member to the edge part. The simplified side view which carried out the cross section which shows a state which has shape | molded the hose main body. The simplified side view which carried out the cross section of a part of bending | flexion reinforcement wire part shaping | molding start state in the short pipe part for joints. The simplified side view which carried out the cross section of a part of the state which shape | molds the bending reinforcement wire part. The simplified side view which carried out the cross section of a part of the state which has shape | molded the hose main body again from the short pipe part for couplings. The simplified side view of the state which divides the short pipe part for joints into two. The simplified side view of the state divided into two. The side view which cut down some conventional synthetic resin hoses. The vertical side view of the state which attached the opening member to the edge part. The front view of a cutting opening end surface.

  Next, a specific embodiment of the present invention will be described with reference to the drawings. In FIGS. 1 and 2, the synthetic resin hose A has an inner peripheral surface formed on a smooth surface having the same diameter over the entire length. An olefin such as polypropylene or polyethylene having a tube wall 1 made of a soft vinyl chloride resin having a certain thickness and formed in a circular or elliptical cross section having a certain diameter on the outer peripheral surface of the tube wall 1 excluding both ends. A hard synthetic resin reinforcing wire 2 is spirally wound at a constant pitch, and this hard synthetic resin reinforcing wire 2 is covered with a hollow helical ridge wall 3 made of soft vinyl chloride resin. The hose main body A1 is formed, and the helical pitch of the both ends extended portion of the hard synthetic resin reinforcing wire 2 spirally wound around the hose main body A1 is expanded on the outer peripheral surfaces of both ends 1a and 1a of the tube wall 1 By The hose main body A1 is bent and deformed in the lengthwise direction from the circumferential direction to the hose end surface, and the bent reinforcing wire portions 2a and 2a are formed by the extended end portion of the hollow spiral ridge wall 3 of the hose main body A1. The joint end portions A2 and A2 are formed by covering with the formed hollow bent ridge wall portions 3a and 3a.

The lengths of the joint ends A2 and A2 provided integrally at both ends of the hose main body A1 only need to be long enough to attach a mouth member 10 to be described later. The above-mentioned rigid synthetic resin bending reinforcing wire portion 2a provided on the pipe wall portion 1a of the portion A2 is made by reducing the diameter of the hard synthetic resin reinforcing wire rod 2 spirally wound on the hose main body A1 and thereby reducing the diameter of the hard synthetic resin. It is formed by supplying a reinforcing wire made on the pipe wall 1a of the joint end A2 .

  Furthermore, the bending reinforcing wire part 2a provided on the pipe wall part 1a of the joint end parts A2 and A2 extends from the base end of the joint end parts A2 and A2 which is the boundary with the hose main body 1 to the opening distal end surface. It may be formed over the entire length, but on the base side of the joint ends A2 and A2, this small diameter is formed while the rigid synthetic resin reinforcing wire 2 spirally wound around the hose main body A1 is formed into a small diameter. The hard synthetic resin reinforcing wire 2 'is spirally wound once or several times on the pipe wall 1a with the same spiral pitch as the hose main body A1 side, and on the end side of the joint end portions A2 and A2 The small-diameter hard synthetic resin reinforcing wire 2 'is extended from the end of the spiral winding of the small-diameter hard synthetic resin reinforcing wire 2' by moving in the direction of expanding the helical pitch of the small-diameter hard synthetic resin reinforcing wire 2 '. Is bent and deformed in the length direction of the hose, and its tip is directed to the opening end face of the joint ends A2 and A2. Yes it formed on bent reinforcing wire portion 2a, and to face the outside from the end surface of the fitting for end A2, A2 as shown the distal end surface of the bent reinforcing wire portion 2a in FIG.

  By expanding the helical pitch over several hitches from the helical winding end of the small-diameter hard synthetic resin reinforcing wire 2 'spirally wound on the pipe wall 1a on the base side of the joint end A2 The bent reinforcing wire portion 2a formed by bending in the length direction and the hollow bent ridge wall portion 3a covering the bent reinforcing wire portion 2a, facing the outside from the opening end face of the joint end portion A2. It is preferable that the leading end portion is oriented in a direction substantially parallel to the axis of the hose main body A1, but the leading end surface is within an angle range of 45 to 90 degrees with respect to the axis of the bending reinforcing wire portion 2a. It suffices if it is oriented in the length direction of the hose so as to have a cross-sectional shape cut at, and by this configuration, a single hollow bent ridge opening from the circular end surface of the joint end A2 The opening end face of the wall 3a is greatly expanded in the circumferential direction of the joint end A2. This hollow bent ridge wall is opened with an expansion that is less than twice the width when cut at right angles to the axis, and the internal bent reinforcing wire portion 2a does not jump out in the hose extension direction. It can be securely held in the part 3a.

  A flexible vinyl chloride resin mouth member 5 is attached to the joint end A2 of the flexible synthetic resin hose A thus configured, as shown in FIG. A well-known structure can be adopted as the mouth member 5, and in the figure, the joint end portion is directed rearward to the inner and outer peripheral edges of the annular plate portion 5a to be brought into contact with the opening end surface of the joint end portion A2. The inner and outer short cylindrical portions 5b and 5c are fitted to fit the end of A2 in a sandwiched state, and a mouth portion 5d that serves as a drainage port is projected forward from the front surface of the annular plate portion 5a. It has the structure which becomes.

  The mouth member 5 covers the outer short tubular portion 5c so as to fit the outer peripheral surface of the joint end A2, and at the same time, the inner short tubular portion 5b is inserted into the tube wall portion 1a of the joint end A2. Then, the outer peripheral surface is attached to the joint end A2 by integrally bonding the outer peripheral surface to the inner peripheral surface of the tube wall portion 1a with an adhesive. At this time, since the mouth member 5 is made of a vinyl chloride resin which is the same material as the tube wall of the hose A, it can be firmly bonded and integrated. In addition, when this mouth member 5 is attached as a drain outlet to one joint end A2 of the synthetic resin hose A, a faucet is attached to the drain outlet of the washing machine or the like at the other joint end A2. A mouth member (not shown) having a shape in which the mouth portion 5d does not exist is attached. Moreover, you may use it as an opening member for connecting the said opening member 5 to another pipe | tube or a hose, not for drain outlets, In this case, the pipe | tube or hose which should connect the opening part 5d is used. The aperture is formed according to the diameter.

  Next, a method for producing the synthetic resin hose A constructed as described above will be described with reference to FIGS. 5 to 10. First, as shown in FIG. 5, a semi-molten soft vinyl chloride having a certain width and a certain thickness is used. As is well known, the strip 11 made of resin is extruded from the first molding nozzle 12 on the base end portion of the metal molding rotary shaft 10 and then on one side of the preceding strip-shaped member portion 11a that is wound first. A tube wall having an inner diameter of the same diameter and a constant thickness over the entire length by spirally winding at a constant pitch while overlapping and fusing together the other side portions of the subsequent belt-shaped member portion 11b to be wound once. In the course of forming the tube wall 1, a semi-molten hard polyethylene, hard polypropylene, etc. having a constant diameter with a circular cross section (may be elliptical) from the second molding nozzle 13 Wire 21 made of olefin resin A rigid synthetic resin reinforcing wire 2 is formed by winding it spirally at a constant pitch on the preceding belt-like material portion 11a while being guided and guided by the guide 14, and on the rigid synthetic resin reinforcing wire 2 A hollow spiral ridge wall 3 built in the rigid synthetic resin reinforcing wire 2 is formed on the outer peripheral surface of the tube wall 1 by covering the above-mentioned succeeding strip-like material portion 11b. In addition, since the hard synthetic resin reinforcing wire 2 is made of an olefin-based resin having poor adhesion, it does not adhere to the tube wall 1 or the hollow spiral ridge wall 3.

  In this way, the tube wall 1 is formed by spirally winding the semi-molten soft vinyl chloride resin strip 11 on the molding rotating shaft 10, and the olefin-based hard synthetic resin reinforcing wire 2 is formed on the tube wall 1. And the rigid synthetic resin reinforcing wire 2 is covered with a part of the flexible vinyl chloride resin strip 11 that forms the tube wall 1 to form a hollow spiral ridge wall 3 with a predetermined length. When the hose main body A1 is manufactured, a joint short pipe portion A2 ′ having a length twice as long as the joint end portion A2 is formed continuously with the end portion of the hose main body A1.

  As shown in FIGS. 6 to 7, the joint short pipe portion A2 ′ is formed by forming a strip 11 made of soft vinyl chloride resin in a semi-molten state continuously extruded from the first molding nozzle 11 with a molding rotary shaft. 10 is continuously connected to the tube wall 1 by spirally winding the other side portion of the succeeding strip-shaped member portion 11b on the one side portion of the preceding strip-shaped member portion 11a on the base plate 10 while being polymerized and fused. Forming the pipe wall 1a '(the pipe wall 1a' has twice the length of the pipe wall 1a of the joint end A2) and the semi-melt extruded from the second molding nozzle 13 While forming the rigid synthetic resin reinforcing wire 2 in a small diameter, the small-diameter reinforcing wire 2 ′ is spiraled once or several times on the starting end of the tube wall 1a ′ with the same helical pitch as the hose main body A1 side. After winding, the guide 14 of the reinforcing wire is moved by a cylinder etc. in the direction of expanding the spiral pitch. Thus, the small-diameter reinforcing wire 2 ′ supplied from the second molding nozzle 13 onto the molding rotary shaft 10 is several pitches in the length direction of the molding rotary shaft 10 from the end of the spiral winding, that is, the hose length direction. The bent reinforcing wire portion 2a 'having a length twice as long as the bent reinforcing wire portion 2a is formed by bending and deforming over a length corresponding to the above.

  Further, as shown in FIG. 8, from the end of the bent reinforcing wire portion 2a ′, the small diameter reinforcing wire 2 ′ is again spirally wound several times at a constant pitch on the forming end portion of the tube wall portion 1a ′. The small-diameter reinforcing wire 2 ′ spirally wound on the terminal end portion of the tube wall 1a ′ from the small-diameter reinforcing wire 2 ′ spirally wound on the start end of the tube wall 1a ′ via the bent reinforcing wire 2a ′. By covering with the other side portion of the semi-molten soft vinyl chloride resin strip 11 forming the tube wall portion 1a ′, a hollow spiral ridge wall portion 3b, a hollow bent ridge wall portion 3a, a hollow spiral ridge The joint short pipe portion A2 ′ formed with the wall portion 3b is manufactured.

  Following the molding of the joint short pipe portion A2 ', the small diameter reinforcing wire 2' pushed out from the second molding nozzle 13 is restored to its original diameter, and the rigid synthetic resin reinforcing wire 2 is used as the joint short pipe. In the same manner as described above, spirally wound on the tube wall 1 formed by spirally winding a semi-molten soft vinyl chloride resin strip 11 on the molding rotating shaft 10 continuously to the end of the portion A2 ′. Then, a hose main body A1 having a predetermined length is manufactured by covering the rigid synthetic resin reinforcing wire 2 with a hollow spiral rib wall 3 formed together with the tube wall 1. At this time, the guide 14 is gradually returned to the original position on the pipe wall 1 of the hose main body A1 between the end of the short pipe section A2 'for the joint and the end of the hose main body A1. The hard synthetic resin reinforcing wire 2 is spirally wound at a constant pitch.

  In this way, the molding rotary shaft is formed while alternately and successively performing the molding process of the hose main body A1 having a constant length and the molding process of the short pipe portion A2 ′ for the fixed length on the molding rotary shaft 10. The length of the joint short pipe portion A2 ′ that is moved toward the tip of the pipe 10 and reaches the tip of the molding rotary shaft 10 while being cooled by the cooling water sprayed from the cooling device, and is fed from the molding rotary shaft 10 9, the joint short pipe portion A2 'is divided into two parts at both ends of the hose main body A1 having a predetermined length as shown in FIG. 10 by sequentially cutting the intermediate portion in the direction by the cutter 16 as shown in FIG. The flexible synthetic resin hose A having the joint end portions A2 and A2 obtained as a result is integrally and continuously manufactured.

  At this time, even if the joint short pipe portion A2 ′ is cut by the cutter 16 in the direction perpendicular to the axis, the joint short pipe portion A2 ′ is cut at the intermediate portion in the length direction of the joint short pipe portion A2 ′. The above-mentioned hollow bent ridge wall portion 3a and the bending reinforcing wire portion 2a 'provided in the hollow bent ridge wall portion 3a are directed in the length direction of the joint short pipe portion A2'. Therefore, the open end surface of the hollow bent ridge wall portion 3a cut by the cutter 16 is in a state of being opened small in the direction of extending the length of the joint end portion A2 without greatly expanding in the circumferential direction. The end of the bent reinforcing wire portion 2a does not protrude from the bent ridge wall portion 3a and can be housed in the hollow bent ridge wall portion 3a.

  In the above embodiment, the hard synthetic resin reinforcing wire 2 is spirally wound at a constant pitch on the base of the joint end A2 from the hose main body A1, but is spirally wound. Instead, the bent reinforcing wire portion 2a may be formed directly over the entire length of the joint end portion A2 by bending in the length direction of the hose.

A Synthetic resin hose
A1 hose mainly
A2 Joint end
A2 'Short pipe part for fitting 1 Pipe wall
1a Pipe wall 2 Reinforced wire made of hard synthetic resin
2 'small-diameter rigid synthetic resin reinforcing wire
2a Bending reinforcement wire part 3 Hollow spiral ridge wall
3a Hollow bent ridge wall
10 Molding rotary shaft
11 Strip material made of soft vinyl chloride resin
12 First molding nozzle
13 Second molding nozzle
14 Guide

Claims (4)

An olefin-based hard synthetic resin reinforcing wire is spirally wound at a constant pitch on the outer peripheral surface of a soft vinyl chloride resin tube wall, which has a smooth inner surface with the same diameter throughout the entire length. And a synthetic resin hose comprising joint end portions at both ends of a synthetic resin hose main body formed by covering the rigid synthetic resin reinforcing wire with a soft vinyl chloride resin hollow spiral ridge wall, The end of the joint is made of a hard synthetic resin reinforcing wire wound around the outer peripheral surface of the tube wall portion obtained by extending the soft vinyl chloride resin tube wall, and the helical pitch of this small diameter hard synthetic resin reinforcing wire is reduced. This hollow bending wire portion is formed by expanding and bending the hose in the length direction of the hose, and a hollow bending rib wall portion continuously covering the bending reinforcing wire portion from the hollow helical rib wall. The above covered with the ridge wall Synthetic resin hose which is characterized in that so as to face the extending direction of the hose end faces of the song reinforcing wire portion from the opening end face of the synthetic resin hose. In the reinforcing wire provided on the tube wall part at the end for both ends joints of the hose main body, on the base part of the tube wall part connected to the hose main side, the hard composite spirally wound around the outer peripheral surface of the hose main pipe wall A reinforcing wire portion having a diameter smaller than that of the hard synthetic resin reinforcing wire with the same pitch as that of the resin reinforcing wire is wound spirally several times. 2. A bent reinforcing wire portion that is bent in the length direction of the hose by moving the reinforcing wire portion connected to several reinforcing wire portions in a direction in which the spiral pitch is expanded is provided. The synthetic resin hose described in 1. A tube wall having the same inner diameter is formed over the entire length by spirally winding the belt-like material made of a soft vinyl chloride resin in a semi-molten state on the rotating shaft at a constant pitch while polymerizing and fusing. A reinforcing wire made of a semi-molten olefin-based hard synthetic resin is spirally wound around the tube wall at a constant pitch, and the reinforcing wire is covered with a semi-molten soft vinyl chloride resin strip. Forming a hose main body of a certain length while forming a hollow spiral ridge wall with a reinforcing wire incorporated therein, and the semi-molten state on the molding rotating shaft continuously to the hose main molding process. this while forming a wall portion which is extended the tube wall by a soft vinyl chloride resin strip material with the same pitch coiling, and diameter of the hard synthetic resin reinforcing wire member of the semi-molten state The hard synthetic resin reinforcing wire diameter to form a bent reinforcing wire portion bent in the longitudinal direction of the hose by widening the spiral pitch with feed on the outer peripheral surface of the tube wall, and, the bending reinforcement wire portion The hollow bent ridge wall portion is covered on the pipe wall portion by forming a hollow bent ridge wall portion covered with the above-mentioned semi-molten soft vinyl chloride resin strip and having a bending reinforcing wire portion inside. The step of forming a short pipe portion for a joint of a certain length provided with a bent reinforcing wire portion is alternately performed, and the short pipe portion for the joint is fed from the forming rotary shaft following the hose main body. Manufacture of a synthetic resin hose characterized in that a hose having a joint end composed of a divided portion of the joint short pipe part is obtained at both ends of the hose main body by sequentially cutting the central part in the length direction. Method. When a rigid synthetic resin reinforcing wire spirally wound on the hose main tube wall is supplied onto the tube wall portion of the joint short tube formed continuously on the hose main tube wall, this hard synthetic resin reinforcement The wire is formed into a small diameter, and the small diameter hard synthetic resin reinforcing wire is spirally wound several times at a constant pitch at both ends in the longitudinal direction of the tube wall to form a spiral reinforcing wire. In the middle part of the tube wall part between the spiral reinforcing wire parts, a small diameter hard synthetic resin reinforcing wire is formed in a bent reinforcing wire part that is bent in the length direction of the hose by moving in the direction of expanding the helical pitch. The method for producing a synthetic resin hose according to claim 3 .

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