JP2008281054A - Rubber hose with spigot and manufacturing method of rubber hose with spigot - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a rubber hose with a mouthpiece capable of eliminating protrusion of an outer cylinder ring from a hose body while restraining reduction of a diameter of the outer cylinder ring for securing the mouthpiece to a degree where the hose body is not damaged. <P>SOLUTION: The outer cylinder ring 8 is separated from a protrusion part 7 to an end side and is provisionally arranged on an outer peripheral side of the mouthpiece 3. An inside diameter of the outer ring 8 is set to be smaller than an outside diameter of a shoulder 6 on an end of the mouthpiece 3. A tubular unvulcanized foamed rubber laminate 9 is molded so as to cover a base end side of the mouthpiece 3. The outer cylinder ring 8 is moved to an outer peripheral side of the unvulcanized foamed rubber laminate 9. The unvulcanized foamed rubber laminate 9 is vulcanized and molded. The outer cylinder ring 8 is clamped and the diameter is reduced until its outside diameter becomes smaller than a maximum diameter of the hose body 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rubber hose with a fitting used for placing, for example, ready-mixed concrete, and a method for producing a rubber hose with a fitting.

  Generally, rubber hoses used for placing ready-mixed concrete are metal fittings with a structure in which a cylindrical metal fitting is fixed to the end of a hose body in which a reinforcing cord layer and a spiral wire are embedded in rubber. The rubber hose is attached.

  The fastening structure of the fitting is a structure in which the reinforcement cord layer of the hose body is folded back and locked to the bead ring, the diameter of the fitting is expanded and the hose body is sandwiched between the outer cylinder ring, and the outer cylinder A structure in which the diameter of the ring is reduced and the hose body is sandwiched between the fitting and the like is adopted.

  However, among these fastening structures, the structure in which the reinforcing cord layer is folded back requires skill in folding the reinforcing cord layer, and the diameter of the end portion of the hose body is increased by the folding. In addition, the structure in which the diameter of the fitting is increased, the wear resistance of the fitting is likely to be lowered because the fitting needs to be made of a soft material. Moreover, the structure which shrinks | reduces an outer cylinder diameter tends to produce a level | step difference in an internal peripheral surface in a boundary part with a metal fitting by tightening a hose main body strongly.

On the other hand, as shown in FIG. 4, for example, in Patent Document 1, after inserting and attaching the fitting 102 to the end of the hose body 101, the outer cylinder ring 103 is disposed on the outer peripheral side of the hose body 101, A rubber hose 104 with a fitting that is crimped to reduce the diameter is disclosed. The rubber hose 104 with a cap fitting firmly attaches the cap fitting 102 while the hose body 101 is gently tightened by bonding the hose body 101 and the cap fitting 102 while suppressing the diameter reduction of the outer cylinder ring 103. Is.
Japanese Utility Model Publication No. 2005-180479 (paragraph number 0035, FIG. 1)

  However, the rubber hose with a fitting of Patent Document 1 is arranged to reduce the diameter by arranging an outer cylinder ring on the outer peripheral side of the end of the hose body into which the fitting is inserted, and is arranged by passing the outer cylinder ring from the fitting side. In order to achieve this, it is necessary to set the inner diameter of the outer cylindrical ring before the diameter reduction larger than the large diameter shoulder portion at the tip of the fitting. Even if the outer cylinder ring is moved along the entire length of the hose body and passed from the end opposite to the fitting, the inner diameter of the outer cylinder ring before the diameter reduction is at least the maximum diameter of the hose body. Must be set larger than

  In this way, by setting the diameter of the outer cylinder ring before the diameter reduction to a large extent, the outer cylinder ring is reduced to such an extent that damage to the rubber and reinforcing cord layer of the hose body does not occur. When the outer diameter becomes larger than the hose body and the rubber hose with a fitting is used, the outer ring may be caught by, for example, a reinforcing bar.

  The present invention provides a rubber hose with a mouthpiece capable of eliminating the protrusion of the outer cylinder ring from the hose body, while suppressing the reduced diameter of the outer cylinder ring for fixing the mouthpiece to such an extent that the hose body is not damaged. And it aims at providing the manufacturing method of the rubber hose with a fitting.

  In order to achieve the above object, a rubber hose with a fitting according to the present invention has a cylindrical fitting attached to the inside of an end portion of a hose body having a cylindrical reinforcing cord layer. On the outer peripheral surface, a protruding portion that continuously protrudes in the circumferential direction is formed, and the hose main body is regulated by restricting the diameter expansion of the reinforcing cord layer on the distal end side and the outer peripheral side of the hose main body in the hose central axis direction from the protruding portion. Is provided with an outer cylinder ring for holding the hose body from the outer peripheral side so as to be locked to the protruding portion. Furthermore, the outer cylinder ring has a diameter that is smaller than the maximum diameter of the portion of the hose body that covers the protruding portion of the fitting, by reducing the diameter so that the hose body is tightened from the outer peripheral side. is there.

  According to the above configuration, the outer cylinder ring that holds the hose body is provided on the tip side of the protrusion so that the hose body is locked to the protrusion formed on the outer peripheral surface of the fitting. The position of the part can be shifted in the hose central axis direction. Thereby, the outer diameter of an outer cylinder ring can be set to a smaller diameter than the maximum diameter of the site | part which covers the protrusion part of a metal fitting in a hose main body, and protrusion of an outer cylinder ring can be prevented.

  The outer ring can be arranged on the outer circumference side of the hose body in advance, but after being placed on the outer circumference side of the hose body, the outer cylinder ring can be tightened from the outer circumference side. The diameter is reduced, and the outer diameter is set to be smaller than the maximum diameter of the hose body at the portion covering the protrusion.

  As a result, the frictional force between the hose body and the outer peripheral surface of the metal fitting and the inner circumferential surface of the outer ring can be increased, and the metal fitting can be secured more firmly and the inner pressure thrust and tensile load can be applied. Can be prevented from coming out of the hose body. Since the hose body is locked to the protruding portion by restricting the diameter expansion of the reinforcing cord layer with the outer cylinder ring, a sufficient fastening force can be obtained simply by reducing the diameter of the outer cylinder ring slightly to increase the frictional force. The hose body is not damaged by the reduced diameter of the outer cylinder ring.

  If the outer cylinder ring is integrated with the hose body by vulcanization, the outer cylinder ring can be used even when the outer cylinder ring is provided without reducing its diameter or when the outer cylinder ring is provided with a slightly reduced diameter. It can be firmly integrated with the hose body. Thereby, only a hose main body does not come out leaving an outer cylinder ring, and a fitting can be fixed reliably. Moreover, by vulcanizing and bonding the fitting to the hose body, the fitting can be fixed more firmly, and the diameter reduction of the outer cylinder ring can be suppressed accordingly.

  If the hose body is embedded with a spiral wire that surrounds and reinforces the hose central axis in a spiral shape, the spiral wire can be hooked between the outer ring and the protruding portion, and the fastening force of the fitting can be increased.

  Moreover, this invention provides the manufacturing method of the rubber hose with a metal fitting which attaches a cylindrical metal fitting to the edge part inner side of the hose main body which has a cylindrical reinforcement cord layer.

  Specifically, first, the outer cylinder ring is disposed on the outer peripheral side of the fitting having a protruding portion that continuously protrudes in the circumferential direction, and is spaced from the protruding portion toward the distal end side in the hose central axis direction. Next, an unvulcanized rubber and a reinforcing cord layer are laminated to form a tubular unvulcanized rubber laminate so as to cover the base end side including the protrusion while exposing the distal end side of the fitting. Further, after moving the outer cylinder ring to the outer peripheral side of the unvulcanized rubber laminate and the tip side from the protruding portion, the unvulcanized rubber laminate and the outer cylinder ring are simultaneously vulcanized.

  According to the above configuration, before the unvulcanized rubber laminate is molded so as to cover the base end side of the fitting, the outer cylinder ring is temporarily placed on the outer peripheral side of the fitting and on the distal side of the unvulcanized rubber laminate. Therefore, after molding the unvulcanized rubber laminate, the outer cylinder ring can be placed on the outer peripheral side of the unvulcanized rubber laminate, for example, without being obstructed by the large diameter portion of the fitting. Accordingly, the inner diameter of the outer cylinder ring can be set small.

  After the unvulcanized rubber laminate is vulcanized and formed, the fastening force of the fitting can be increased by crimping the outer cylinder ring to reduce the diameter. Furthermore, if the outer cylinder ring is reduced in diameter until the outer diameter is smaller than the maximum diameter of the portion of the hose body that covers the protruding portion of the fitting, the outer cylinder ring will protrude beyond the hose body. Can be prevented. Moreover, even if the diameter of the outer cylinder ring is reduced so that it does not protrude from the hose body, the outer cylinder ring before the diameter reduction is temporarily arranged before molding the unvulcanized rubber laminate, so the outer cylinder ring before the diameter reduction The inner diameter of the hose body can be reduced by reducing the inner diameter of the hose body, and the hose body can be prevented from being damaged by the reduced diameter of the outer cylinder ring.

  By adopting the above-described configuration in which the outer cylinder ring is temporarily arranged, the inner diameter of the outer cylinder ring before the diameter reduction can be set smaller than the maximum diameter of the portion of the hose body that covers the protruding portion of the fitting. It is also possible to set the inner diameter of the outer cylindrical ring before the diameter reduction to be smaller than the outer diameter of the shoulder part even when the cap has a shoulder part with a larger diameter than the other part at the tip. .

  As described above, according to the present invention, since the outer cylinder ring can be prevented from projecting by providing the outer cylinder ring at a position shifted from the projecting portion of the metal fitting to the tip side, the rubber hose with the metal fitting is used. At this time, the outer ring can be prevented from being caught by a reinforcing bar or the like.

  Moreover, by temporarily disposing the outer cylinder ring before molding the unvulcanized rubber laminate, the inner diameter of the outer cylinder ring before the diameter reduction can be set small, so that the amount of diameter reduction of the outer cylinder ring is suppressed. Thus, the hose body can be prevented from being damaged due to the reduced diameter of the outer ring.

  Hereinafter, the best mode for carrying out a rubber hose with a fitting and a rubber hose with a fitting according to the present invention will be described with reference to the drawings. FIG. 1 is a view showing a rubber hose with a fitting according to the present invention, in which the upper half is a cross-sectional view and the lower half is a side view. FIG. 2 is an enlarged view showing the vicinity of the protruding portion and the outer cylinder ring, with the upper half being a sectional view and the lower half being a side view.

  The rubber hose with a fitting 1 is used as, for example, a tip hose for placing ready-mixed concrete, and has a structure in which a tubular fitting 3 is fixed to the inside of an end portion of a hose body 2.

  The hose body 2 has a structure in which a tubular reinforcing cord layer 4 and a spiral wire 5 that spirally surrounds the hose central axis are embedded in a tubular rubber and reinforced. It is vulcanized and bonded so as to cover the outer peripheral surface on the proximal end side while exposing the distal end side. The hose body 2 is set to have an inner diameter that is substantially the same as that of the fitting 3 so that a step on the inner peripheral surface does not occur at the boundary with the fitting 3.

  The end fitting 3 has a tapered shape with the distal end widened, and a shoulder portion 6 having a larger diameter than other portions is formed at the distal end. A protrusion 7 that continuously protrudes in the circumferential direction is formed on the outer peripheral surface of the base end of the metal fitting 3, and the outer diameter of the hose body 2 at the portion covering the protrusion 7 is larger than the outer diameter of other portions. Slightly larger. An outer cylinder ring 8 that holds the hose body 2 from the outer peripheral side is provided integrally with the hose body 2 by vulcanization adhesion on the distal end side of the protrusion 7 and on the outer peripheral side of the hose body 2.

  The reinforcing cord layer 4 is provided so as to climb over and cover the protruding portion 7 in the hose central axis direction, and the diameter on the tip side of the protruding portion 7 is set to be smaller than the outer diameter of the protruding portion 7. By restricting the diameter of the reinforcing cord layer 4 on the distal end side of the protruding portion 7 by the outer cylinder ring 8, the hose body 2 in which the reinforcing cord layer 4 is embedded is locked to the protruding portion 7 from the distal end side. The slipping of the fitting 3 from the hose body 2 is restricted and firmly secured.

  The outer cylinder ring 8 has a thin rectangular cross section in the radial direction and is reduced in diameter on the outer peripheral side of the hose main body 2 to tighten the hose main body 2 from the outer peripheral side. As a result, the hose body 2 is slightly compressed, the frictional force between the outer peripheral surface of the fitting 3 and the inner peripheral surface of the outer ring 8 is moderately increased, and the hose body 2 is sufficiently pushed to reinforce the reinforcing cord. The diameter expansion of the layer 4 is reliably prevented. The outer cylinder ring 8 may have another cross-sectional shape such as a circular cross-section, but preferably has a thin-walled cross-section that is thin in the radial direction because the protrusion can be easily suppressed.

  The outer diameter (D1) after the diameter reduction of the outer cylinder ring 8 is set to a smaller diameter than the maximum diameter (D2) of the portion of the hose body 2 that covers the protrusion 7 of the fitting 3 (D1 <D2), The outer cylinder ring 8 is provided without protruding from the hose body 2. Since the outer cylinder ring 8 and the hose body 2 are integrated by vulcanization adhesion, the outer cylinder ring 8 set to a predetermined inner diameter can be used without reducing the diameter.

  Next, the manufacturing method of the rubber hose with a fitting will be described. FIG. 3 is a diagram for explaining a method of manufacturing a rubber hose with a fitting.

  First, as shown in FIG. 3 (a), the outer tube ring 8 is put on the metal fitting 3 from the base end side having a small diameter and no shoulder portion 6, and on the outer peripheral side of the metal fitting 3, from the protruding portion 7 to the distal end side. The outer cylinder ring 8 is arranged at a position to be separated.

  Next, as shown in FIG. 3B, the unvulcanized rubber on the inner surface side, the reinforcing cord layer 4, the spiral wire so as to cover the proximal end side including the protruding portion 7 while exposing the distal end side of the fitting 3 5. The reinforcing cord layer 4 and the unvulcanized rubber on the outer surface side are sequentially laminated to form a tubular unvulcanized rubber laminate 9. The thickness of the unvulcanized rubber laminate 9 is, for example, about 9 mm for the general portion and about 5.6 mm for the portion that does not require the inner rubber on the tip side of the protrusion 7. For example, the outer diameter of the projection 7 is φ106.1 mm, and the outer diameter of the general portion in the vicinity thereof is φ94.1 mm (the projection height of the projection 7 is 3.75 mm).

  Here, the inner diameter (d1a) before the diameter reduction of the outer cylinder ring 8 is set to, for example, φ105.3 mm, for example, the maximum diameter of the portion covering the protruding portion 7 of the hose body 2 set to φ117.6 mm, for example. Smaller diameter than (D2) (d1a <D2), smaller diameter than the outer diameter (D3) of the shoulder portion 6 (d1a <D3), and larger diameter than the reinforcing cord layer 4 wound around the outer peripheral side of the fitting 3 To do. Moreover, the outer diameter (D1a) before the diameter reduction of the outer cylinder ring 8 is set to, for example, φ114.3 mm, so that the maximum diameter (D2) of the portion covering the protruding portion 7 in the unvulcanized rubber laminate 9 is set. (D1a≈D2).

  Further, as shown in FIG. 3 (c), after the outer cylinder ring 8 is moved to the outer peripheral side of the unvulcanized rubber laminate 9 and to the tip side of the protruding portion 7, as shown in FIG. 3 (d). Then, the unvulcanized rubber laminate 9 is vulcanized and molded by cloth fastening vulcanization. As a result, the rubber smoothly flows around the outer cylinder ring 8, and the outer cylinder ring 8 is firmly fixed by vulcanization adhesion. Note that the outer ring 8 can be easily moved to the base end side because the cap 3 has a tapered shape with the distal end widened.

  Thereafter, as shown in FIG. 3 (e), the outer cylinder ring 8 is crimped by, for example, a hydraulic caulking machine, and the outer diameter (D1a) before the diameter reduction set to, for example, φ114.3 mm is set to, for example, φ110.3 mm. The diameter is reduced to the set outer diameter (D1) after the diameter reduction (caulking rate: 3.5%). Thus, the outer diameter (D1) after the diameter reduction is made smaller than the maximum diameter (D2) of the portion of the hose body 2 that covers the protruding portion 7 of the fitting 3 (D1 <D2).

  According to the above configuration, since the outer cylinder ring 8 is arranged with a position shifted from the protruding portion 7, the outer diameter of the outer cylinder ring 8 can be set smaller than the hose body 2. Thereby, protrusion of the outer cylinder ring 8 can be suppressed, and for example, it can be prevented from being caught on concrete reinforcement when dragging the rubber hose 1 with a fitting.

  Since the unvulcanized rubber laminate 9 is molded after the outer cylinder ring 8 is temporarily arranged on the distal end side of the fitting 3, the inner diameter (d1a) of the outer cylinder ring 8 before the diameter reduction is set to the outer diameter ( D2) and the outer diameter (D3) of the shoulder portion 6 can be set smaller (d1a <D2, D3). Thereby, for example, the inner diameter (d1a) of the outer cylinder ring 8 whose diameter is reduced to φ101.3 mm can be set to a smaller φ105.3 mm, for example, and the diameter reduction amount of the outer cylinder ring 8 can be suppressed. Thus, damage such as damage to the hose body 2 when the outer cylinder ring 8 is caulked and partial deformation of the outer cylinder ring 8 can be prevented.

  In addition, due to the reduced diameter of the outer cylinder ring 8, the frictional force between the hose body 2, the fitting 3 and the outer cylinder ring 8 is moderately increased, and the diameter of the reinforcing cord layer 4 is restricted so that the hose body 2 protrudes. 7, the fitting 3 can be firmly fixed so as to withstand the internal pressure thrust and the tensile load applied to the rubber hose 1 with a fitting while suppressing the amount of diameter reduction of the outer ring 8. Accordingly, it is possible to withstand an internal pressure of, for example, 2 MPa or more which is close to the breaking pressure of the hose body 2 without causing the fitting 3 to come off.

  Further, the outer ring 8 only needs to regulate the diameter expansion of the reinforcing cord layer 4 and can be made thin and short, so that the caulking force is reduced and its fluctuation is suppressed, The thickness of the fitting 3 that receives the reaction force can be reduced.

  Since the outer cylinder ring 8 is integrated with the hose body 2 by vulcanization adhesion, it is possible to prevent only the hose body 2 from leaving the outer cylinder ring 8. Further, by performing vulcanization adhesion, a higher tightening effect of the outer cylinder ring 8 can be obtained, and the amount of diameter reduction of the outer cylinder ring 8 is suppressed, so that the adhesion is not broken by the diameter reduction. . Further, even when the outer cylinder ring 8 is not bonded, since the outer cylinder ring 8 is placed on the outer peripheral side of the unvulcanized rubber laminate 9 and vulcanized, the outer cylinder ring 8 is added. There is no need to fit into the hose body 2 after the sulfur molding, and no displacement occurs.

The figure which shows the rubber hose with a metal fitting which concerns on this invention, an upper half is sectional drawing, a lower half is a side view It is an enlarged view showing the vicinity of the protrusion and the outer cylinder ring, the upper half is a sectional view, the lower half is a side view The figure explaining the manufacturing method of a rubber hose with a metal fitting Sectional view of a conventional rubber hose with a fitting

Explanation of symbols

1 Rubber hose with metal fittings 2 Hose body 3 Metal fittings 4 Reinforcement cord layer 5 Spiral wire 6 Shoulder part 7 Projection part 8 Outer cylinder ring 9 Unvulcanized rubber laminate

Claims (6)

A rubber hose with a fitting that is formed by fastening a tubular fitting on the inner side of the end of a hose body having a tubular reinforcing cord layer,
A protruding portion that continuously protrudes in the circumferential direction is formed on the outer peripheral surface of the fitting, and the diameter of the reinforcing cord layer is increased on the distal end side and the outer peripheral side of the hose body in the hose central axis direction than the protruding portion. An outer cylinder ring is provided to hold the hose body from the outer peripheral side so as to regulate and lock the hose body to the protruding portion, and the outer cylinder ring is reduced in diameter to tighten the hose body from the outer peripheral side. A rubber hose with a cap, wherein the diameter is set to be smaller than the maximum diameter of a portion of the hose body that covers the protruding portion of the cap.   2. The rubber hose with a fitting according to claim 1, wherein the outer ring and the fitting are vulcanized and bonded to a hose body. A method of manufacturing a rubber hose with a fitting that is formed by fastening a tubular fitting to the inside of an end of a hose body having a tubular reinforcing cord layer,
An outer cylinder ring is arranged on the outer peripheral side of the fitting having a protruding portion that continuously protrudes in the circumferential direction, and is separated from the protruding portion toward the distal end side in the hose central axis direction, and then the distal end side of the fitting The unvulcanized rubber and the reinforcing cord layer are laminated to form a tubular unvulcanized rubber laminate so as to cover the base end side including the protruding portion while exposing the outer periphery of the unvulcanized rubber laminate. A method of manufacturing a rubber hose with an end fitting, wherein the uncured rubber laminate and the outer cylinder ring are simultaneously vulcanized and molded after the outer cylinder ring is moved to the distal end side with respect to the projecting portion.   The method for producing a rubber hose with a metal fitting according to claim 3, wherein after the vulcanized rubber laminate is vulcanized and molded, the outer ring is swaged to reduce the diameter.   The inner diameter of the outer cylinder ring before the diameter reduction is set to a smaller diameter than the maximum diameter of the portion of the hose body that covers the protruding portion of the fitting, and the outer cylinder ring has an outer diameter of the hose body. The method for manufacturing a rubber hose with a cap according to claim 4, wherein the diameter is reduced until the diameter becomes smaller than the maximum diameter of the portion covering the protruding portion of the cap.   A shoulder portion having a larger diameter than other portions is formed at the tip of the fitting, and the inner diameter of the outer cylinder ring before being reduced is set smaller than the outer diameter of the shoulder portion. Item 6. A method for producing a rubber hose with a metal fitting according to Item 4 or 5.

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