JP2005180479A - Hose with fitting hardware and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hose with a fitting hardware, light-weighted and firmly fixed, and a manufacturing method thereof. <P>SOLUTION: In this hose with the fitting hardware, a cylindrical fitting hardware 15 is inserted in the base of a rubber hose 11 and the rubber hose 11 is fixed to the fitting hardware 15. The fitting hardware 15 is formed so that the inside is tapered to be gradually reduced in diameter extending from the base to the forward part, and the inside diameter of the tip of the fitting hardware is equal to the inside diameter of the rubber hose 11. Further, in the fitting hardware 15, the outside forward end is provided with a joining part 18 having one or two or more annular projections for slip-off prevention in the circumferential direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a rubber hose, for example, a hose with a metal fitting in which a metal fitting is attached to a base portion of a tip hose for placing concrete, and a method for manufacturing the same.

Conventionally, when placing ready-mixed concrete at a construction site, for example, ready-mixed concrete transported by a concrete mixer truck is once received by a concrete pump truck and connected to the discharge port of a concrete pump truck. A pressure feed pipe was connected to the hose 80 with a mouth metal fitting for placing the ready-mixed concrete shown in FIG. 2 to form a pressure feed path, and the pressure feed was carried out to a predetermined place.

At this time, in order to increase the discharge pressure of the ready-mixed concrete at the discharge port of the hose 80 with a fitting, or even when the supply of ready-mixed concrete to the pump-feed pipe is delayed, it is difficult to generate a gap in the pump-feed pipe. In addition, a tapered taper 83 with a gradually decreasing inner diameter is provided in the mouthpiece 82 for connecting the pressure feeding pipe and the rubber hose 81 to avoid stagnating or clogging the raw concrete as much as possible.

Usually, in the case of construction, the final pipe (pressure feed pipe) has an inner diameter of 4 inches (105 mm), and the inner diameter of the rubber hose 81 is less than that in consideration of workability (lightness, bending), for example, 90 to 97 mm. Is generally. Therefore, in order to correct the inner diameter difference between the pipe and the inner surface of the hose, for example, when a rubber hose having an inner diameter of 97 mm is used, the taper 83 of the fitting 82 is narrowed from 105 mm to 97 mm. The length of the taper portion 84 in which the taper 83 is formed is naturally preferably shorter in consideration of lightness, but if it is too short, the ready-mixed concrete may be blocked due to the steep inclination angle.

Here, from experience, the length of the taper 83 that reduces the inner diameter from 105 mm to 97 mm is required to be at least about 150 mm. Further, on the proximal end side of the tapered portion 84, a length having a flange portion 85 (for example, 30 mm) having a length of 10 to 50 mm and an annular protrusion 86 for fixing the rubber hose 81 in order to connect to the pressure feeding pipe. The insertion part 87 (for example, 100 mm) of 50-100 mm was needed, and the full length of the fitting 82 was about 280 mm. The thickness of the metal fitting 82 is usually 3.0 to 6.0 mm, which is very heavy.

Moreover, as a fastening means of a rubber hose and a metal fitting, there are a chemical fastening method and a physical fastening method. The chemical fastening method is a method in which the rubber hose 81 attached to the fitting 82 is heated to, for example, 150 to 180 ° C. and baked and fixed. In addition, when the rubber hose 81 was baked and fixed to the metal fitting 82 by the chemical fastening method, the total weight of the rubber hose 81 at the portion of the metal fitting 82 and the tip of the metal fitting 82 was 8.2 kg.

In addition, as a physical fastening method, for example, in Patent Document 1, an inner insert portion having a reduced diameter of a connection fitting is inserted inside a root portion of a placing hose body, and an outer sleeve portion of the connection fitting is further connected to an outer periphery of the root portion. The inner insert is expanded until the inner diameter is the same as that of the hose body, and the inner hose body is clamped and fixed between the inner insert part and the outer sleeve part. A live-con driving hose is disclosed. Patent Document 2 discloses a so-called outer cylinder compression type pressure fluid supply hose that has a rubber hose that can be expanded and contracted, a socket that is attached to a tube of a connection fitting, and that further fixes the tube to the rubber hose. .

Japanese Utility Model Publication No. 6-63982 JP-A-3-99289

Here, since the conventional metal fitting 82 has the flange part 85 and the insertion part 87 in addition to the taper part 84, there existed a problem that it became long and heavy, and the workability | operativity of ready-mixed concrete was inferior. .
In addition, when the metal fitting 82 and the rubber hose 81 are fixed by a chemical fastening method by baking, a stable strength can be obtained. There was also a problem that swelled and the weight increased.

In addition, the method described in Patent Document 1 is excellent in strength against the disconnection of the metal fittings, and although it is a slim image, in the case of ready-mixed concrete, the thickness of the metal fitting nipple decreases due to wear, and finally the wall becomes thin. There was also a risk that the pressing force was reduced and the metal fittings were removed. In addition, there is a problem that the metal fitting for expansion is expensive in terms of material and shape.

Furthermore, the method described in Patent Document 2 is effective for a small diameter (for example, an inner diameter of 6 to 25 mm) such as a high-pressure hose, but in the above application size (about 100 mm), a considerable force is applied at the time of pressing. Otherwise, pressure resistance performance could not be obtained, and if too much pressure was applied, the rubber hose could be damaged.
This invention is made | formed in view of this situation, and it aims at providing the hose with a metal fitting which is lightweight and firmly fixed, and its manufacturing method.

The hose with a fitting according to claim 1, which meets the above-mentioned purpose, is a hose with a fitting, in which a cylindrical fitting is inserted into the base of a rubber hose, and the rubber hose is fixed to the fitting.
The end fitting is formed in a taper whose inner diameter is gradually reduced from the base portion to the tip portion, and the inner diameter of the tip portion of the end fitting is formed to be the same as the inner diameter of the rubber hose. Has a joint portion provided with one or more annular protrusions for preventing slipping in the circumferential direction at the outer tip portion.
In the hose with a cap fitting according to claim 1, a rubber hose having an inner diameter of about 75 to 200 mm and a length of about 4 to 10 m is usually used.

According to a second aspect of the present invention, there is provided a hose with a cap fitting according to the first aspect, wherein a pressure clamp for fastening the rubber hose is attached to the outside of the rubber hose attached to the joint portion.
According to a third aspect of the present invention, there is provided a hose with a metal fitting according to claim 1 or 2, wherein the rubber hose is fixed to the metal fitting by baking.

According to a fourth aspect of the present invention, in the hose with a fitting, the outer diameter of the joint portion is the same in the length direction.
In the hose with a cap according to claim 4, since the connecting portion of the cap has the same diameter, for example, the inside of a pipe-shaped object, a columnar object, etc. is cut with a lathe or the like to provide a taper to facilitate the fitting. It can be manufactured and processing accuracy can be improved.
The hose with a fitting according to claim 5 is the hose with a fitting according to claims 1 to 4, wherein the fitting has a flange at the outer base.

A hose with a cap fitting according to claim 6 is a hose with a cap fitting according to claims 1 to 5, wherein the rubber hose is a ready-mixed concrete tip hose reinforced with a reinforcing wire and a fiber cord.
7. A hose with a metal fitting according to claim 6, wherein the ready-made concrete placing tip hose (hereinafter also referred to as a placing tip hose) is, for example, a piano wound spirally between an inner rubber layer and an outer rubber layer. A reinforcing wire made of wire, SWB steel or the like is provided. Furthermore, a fiber cord made of a tinted fiber cord such as nylon or polyester or a canvas can be wound around the inside and / or outside of the reinforcing wire. Since the driving tip hose is reinforced with a reinforcing wire or the like, sufficient pressure resistance can be obtained.

According to a seventh aspect of the present invention, there is provided a method of manufacturing a hose with a metal fitting, wherein the base of the rubber hose is formed with a taper that the inner diameter is gradually reduced from the base to the tip, and the inner diameter of the tip is equal to the inner diameter of the base of the rubber hose. The same, and after inserting a fitting having a joint portion provided with one or two or more annular prevention protrusions in the circumferential direction at the outer tip, and after baking and fixing, Tighten with a pressure clamp from the outside of the rubber hose.

In the manufacturing method of the hose with a metal fitting according to claim 7, the rubber hose is fixed to the metal fitting by heating and baking the rubber hose to about 150 to 180 ° C, for example. Further, the pressing force applied by the pressing tool may be about 1/2 to 2/3 as compared with the pressing force when the pressing tool is used alone. Since the pressurizing force at the time of pressing is reduced, damage to the rubber hose can be reduced, and the hose with a fitting can be prolonged.

The method of manufacturing a hose with a metal fitting according to claim 8 is formed at the base of the rubber hose with a taper in which the inside gradually decreases in diameter from the base to the tip, and further, the inner diameter of the tip is equal to the inner diameter of the base of the rubber hose. In addition, a fitting having a joint provided with one or two or more annular protrusions for preventing removal in the circumferential direction is inserted into the outer tip, and the rubber hose is attached to the fitting. Bake and fix.
In the manufacturing method of the hose with a metal fitting of Claim 8, the baking of a rubber hose is performed by heating a rubber hose to about 150-180 degreeC, for example.

The method of manufacturing a hose with a metal fitting according to claim 9 is formed at the base of the rubber hose with a taper that the inside gradually decreases in diameter from the base to the front, and the inner diameter of the front is the inner diameter of the base of the rubber hose. In addition, a metal fitting having a joint portion having one or more annular protrusions for preventing slipping is inserted in the outer tip portion in the circumferential direction, and the outside of the rubber hose is clamped. Tighten with a tool.

Since the hose with a cap according to any one of claims 1 to 6 is provided with a taper on the inside of the cap and a joint is provided on the outer side of the tip, the overall length of the cap can be shortened, and the weight is reduced. can do.
In particular, the hose with a fitting according to claim 2 can be firmly fastened because the pressure fastener for fastening the rubber hose is attached to the outside of the rubber hose attached to the joint.
Since the rubber hose is fixed to the metal fitting by baking, the hose with the metal fitting according to claim 3 can be firmly fastened.

In the hose with a cap fitting according to claim 4, since the outer diameter of the joint portion is the same in the length direction, it is possible to apply a uniform pressure when tightening.
In the hose with a mouth piece according to claim 5, since the mouth piece has a flange at the outer base portion, the rubber hose can be connected to the other hose via the flanged fitting attached to the other hose. .
Since the rubber hose is a ready-mixed concrete tip end hose reinforced with a reinforcing wire and a fiber cord, the lightweight concrete ready-placed tip hose with a stop bracket is manufactured. be able to.

According to the method for manufacturing a hose with a cap fitting according to claim 7, since the cap fitting is inserted into the base of the rubber hose and baked and fixed at the joint portion of the cap fitting, and further tightened by a pressure clamp, Thus, it can be firmly fixed. In addition, since the fixing is performed by baking and tightening, it is possible to reduce the pressure applied during tightening, reduce damage to the rubber hose, and extend the life.

According to the method for manufacturing a hose with a metal fitting according to an eighth aspect, the metal fitting is inserted into the base of the rubber hose and the rubber hose is baked and fixed to the metal fitting so that it can be firmly fixed.
According to the ninth aspect of the present invention, the hose with a fitting can be firmly fixed because the fitting is inserted into the base of the rubber hose and the outer side of the rubber hose is tightened with a pressure clamp.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
Here, FIG. 1 is explanatory drawing of the hose with a metal fitting which concerns on one embodiment of this invention.

With reference to FIG. 1, the hose 10 with a metal fitting which concerns on one embodiment of this invention is demonstrated.
The hose 10 with a metal fitting has a rubber hose 11 having an inner diameter of 75 to 200 mm, a length of 4 to 10 m, and a thickness of 5 to 30 mm (here, an inner diameter of 97 mm, a length of 7 m, and a thickness of 20 mm). In the present embodiment, as an example of the rubber hose 11, a ready-mixed concrete tip end hose that is used when ready-mixed concrete is used is used.

The rubber hose 11 has an inner first rubber layer 12 and an outer second rubber layer 13, and a reinforcement made of piano wire, SWB steel, or the like between the first and second rubber layers 12, 13. A wire 14 is wound in a spiral shape, and a fiber cord (not shown) such as nylon or polyester is wound around one or both of the inside and the outside of the reinforcing wire 14, so that sufficient pressure resistance can be obtained. it can.

The hose 10 with the fitting has a cylindrical fitting 15 inserted into the base of the rubber hose 11 and fixed by baking the rubber hose 11. In order to connect the rubber hose 11 having an inner diameter of 97 mm and, for example, a pressure feeding pipe (not shown) having an inner diameter of 105 mm, the fitting 15 has a taper 16 whose inner diameter gradually decreases from the base (inner diameter 105 mm) to the tip (inner diameter 97 mm). Is formed. In addition, the length of the part in which the taper 16 of the metal fitting 15 is formed was 150 mm (150-200 mm).

The end fitting 15 has a joint portion 18 provided with one or more, for example, three annular projections 17 for preventing slipping in the circumferential direction at the tip portion outside the position where the taper 16 is provided. ing. The annular protrusions 17 have a protrusion height of 2 mm and a width of 10 mm, and the adjacent annular protrusions 17 are separated by a predetermined interval, for example, 10 mm. Further, the joint portion 18 of the cap 15 has an outer diameter that is the same in the length direction, for example, 115 mm.

The base metal fitting has a flange 19 at a base portion outside the position where the taper 16 is provided. For example, the flange 19 has an outer diameter of 122 mm and a length of 16 mm.
The fitting 15 is provided with an insertion portion 20 having an inner diameter of 97 mm, a length of 20 mm, and a thickness of 3 mm at the tip of the taper 16, and the overall length of the fitting 15 is 170 mm.

In the hose 10 with the fitting, a pressure clamp 21 for fastening the rubber hose 11 is attached to the outside of the rubber hose 11 attached to the joint 18 of the fitting 15. The pressure fastener 21 has a length of 40 mm and a thickness of 4 mm, for example, and is attached to the rubber hose 11 by pressurization.

Next, the manufacturing method of the hose 10 with a metal fitting will be described.
The fitting 15 can be manufactured by, for example, cutting a cylindrical iron pillar (for example, SS400) having a diameter of 127 mm and a length of 170 mm with a lathe. The inner side of the iron pillar forms a taper 16 having a length of 150 mm that gradually decreases from the base (inner diameter 105 mm) to the tip (inner diameter 97 mm), and the tip of the taper 16 has an inner diameter of 97 mm and a length of 20 mm. An insertion portion 20 having the same diameter in the length direction is provided. In addition, the outer side of the iron pillar is cut so that the thickness of the insertion portion 20 is 3 mm, that is, the outer diameter is 103 mm.

Further, cutting is performed so that the outer diameter becomes the same diameter of 115 mm from the tip portion outside the position where the taper 16 is provided in the base direction to a length of 134 mm (20 to 154 mm as viewed from the tip as a whole).
In addition, three grooves having a depth of 2 mm and a width of 10 mm are cut at intervals of 10 mm in the circumferential direction at a tip portion having an outer periphery of 115 mm. By this cutting, three annular protrusions 17 having a protruding height of 2 mm and a width of 10 mm are formed at intervals of 10 mm.

The base of the iron pillar is cut to an outer diameter of 122 mm and a length of 16 mm, and the flange 19 is formed for the joint.
In addition to the iron pillar having a diameter of 127 mm and a length of 170 mm, the fitting 15 can be manufactured by cutting an iron pillar having a diameter of 122 mm or more and a length of 170 mm or more. Since the fitting 15 can be manufactured by a lathe, it can be formed with high accuracy.

For example, a pipe having a length of 40 mm, a thickness of 4 mm, and an inner diameter of 145 mm can be used as the pressure fastener 21. Further, the pressure fastener 21 can be fixed by bending an iron plate having a length of 40 mm, a thickness of 4 mm, and a width of 455 mm along the outside of the rubber hose 11 attached to the fitting 15, and further pressing and fastening.

The metal fitting 15 is inserted into the base of the rubber hose 11 by about 85 mm from the tip of the metal fitting 15 so that the annular protrusion 17 of the joint 18 is covered with the base of the rubber hose 11. The base of the rubber hose 11 (the part attached to the metal fitting 15) is heated to 150 to 180 ° C., baked (also referred to as vulcanization adhesion), and then fixed from the outside of the rubber hose 11 attached to the joint 18. Tighten with the tool 21. Note that the total weight of the fitting 15 and the portion of the rubber hose 11 and the pressure fastener 21 applied to the tip of the fitting 15 is 5.4 kg. From the conventional fitting portion of the hose with fittings (8.2 kg). The weight has been reduced by about 30%.

In the hose 10 with the clasp, the rubber hose 11 baked and fixed to the clasp 15 is fastened by changing the pressure applied to the clamp 21 when the clamp 21 is tightened, and the hose 10 with the clasp is ruptured. Loaded until. Note that the applied pressure is the difference between the cross-sectional area S ₁ of the rubber hose 11 and the cross-sectional area S ₂ of the rubber hose 11 after tightening with the pressure fastener 21 (S ₁ −S). _The ratio of ₂ ) to the cross-sectional area S ₁ before fastening is obtained as the pressurization rate P.

Here, the outer diameter of a thickness in the cap member 15 of 115mm mounting the rubber hose 11 of 20 mm, since the outer diameter of the rubber hose 11 extends is a rubber hose 11 attached is 145mm, the cross-sectional area S ₁ is (1) in Indicated.
S ₁ = (145/2) ² × π− (115/2) ² × π (1)
Further, the cross-sectional area S ₂ is the same as the inner diameter of the pressure fastener 21 with the outer diameter of the rubber hose 11, and when the inner diameter of the pressure fastener 21 is L, the cross-sectional area S ₂ can be expressed by equation (2). it can.
S ₂ = (L / 2) ² × π− (115/2) ² × π (2)

Therefore, the pressurization rate P is expressed by the equation (3).
P = (S ₁ −S ₂ ) / S ₁ × 100 (3)
Here, the presser 21 is pressed so that the pressurization rate P is 10%, 15%, and 20% (that is, L is 142.3, 140.9, and 139.5 mm, respectively) The rubber hose 11 was fixed.

Here, the pressure fastener 21 was pressurized to a pressurization rate of 10% and fixed to the rubber hose 11 to manufacture the hose 11 with a fitting, and a pressure gauge was attached to the tip of the rubber hose 11 to close and apply a load. However, the central part of the rubber hose 11 (around 3.5 m from the front part of the rubber hose 11) burst at 4.6 MPa. In addition, when the pressurization rate is 15% and 20%, the rubber hose 11 may be damaged by rupturing at the attachment portion of the fitting 15 at 4.0 and 3.5 MPa, respectively, and tightening it strongly. Understand.

(Comparative Example 1)
When the rubber hose 11 was baked and fixed to a conventional baking type fitting 82 (see FIG. 2), a hose with a fitting was manufactured, and a pressure gauge was attached to the tip of the rubber hose 11 to close and apply a load. The central part of the rubber hose 11 burst at 4.9 MPa. Although this hose with a metal fitting can be subjected to a large load, the hose with a metal fitting is heavy and difficult to handle.

(Comparative Example 2)
A hose with a fitting was manufactured by the inner cylinder expansion method described in Patent Document 1. At this time, the inner diameter of the outer sleeve portion was changed, and the pressurization rate P was set to 15% and 20%.
At a pressurization rate of 15%, the central portion burst at 4.1 MPa, and at 20%, the attachment portion of the fitting was ruptured at 4.0 MPa.

(Comparative Example 3)
By using an outer cylinder compression method described in Patent Document 2, the pressurization rate of the pressure fastener was set to 10%, 15%, and 20% to manufacture a hose with a fitting. The hose with a fitting with a pressurization rate of 10% was weakly tightened, and the rubber hose was detached from the fitting with a pressure of 3.2 MPa. Moreover, when the pressurization rate was 15% and 20%, the attachment part of the fitting was ruptured at 3.9 MPa and 2.6 MPa, respectively, and the rubber hose was damaged.

The present invention is not limited to the above-described embodiment, and can be changed without changing the gist of the present invention. For example, a part or all of the above-described embodiment and modification examples are combined. The case where the hose with a fitting of the present invention and the method for manufacturing the same are also included in the scope of the right of the present invention.

For example, in the hose with a fitting according to the embodiment described above, the outer diameter of the joint of the fitting is the same, but the diameter may be reduced similarly to the taper with the same thickness. In this case, it is preferable to reduce the diameter of the inside of the pressure fastener in the same manner.
Further, in the method of manufacturing a hose with a fitting according to the above embodiment, the fitting is inserted into the base of the rubber hose and fixed by being baked at the joint of the fitting, and then further tightened with a pressure clamp. It may be only fixed or may be only tightened by a pressure clamp.

It is explanatory drawing of the hose with a metal fitting which concerns on one embodiment of this invention. It is a hose with a mouthpiece which concerns on a prior art example.

Explanation of symbols

10: Hose with fitting, 11: Rubber hose, 12: First rubber layer, 13: Second rubber layer, 14: Reinforcing wire, 15: Fitting, 16: Taper, 17: Annular protrusion, 18: Joint , 19: flange, 20: insertion part, 21: pressure clamp

Claims (9)

In a hose with a fitting that a cylindrical fitting is inserted into the base of the rubber hose and the rubber hose is fixed to the fitting,
The end fitting is formed in a taper whose inner diameter is gradually reduced from the base portion to the tip portion, and the inner diameter of the tip portion of the end fitting is formed to be the same as the inner diameter of the rubber hose. Has a joint part provided with one or two or more annular projections for preventing slippage in the circumferential direction at the outer tip part. 2. The hose with a fitting according to claim 1, wherein a pressure fastener for fastening the rubber hose is attached to the outside of the rubber hose attached to the joint. The hose with a fitting according to any one of claims 1 and 2, wherein the rubber hose is fixed to the fitting by baking. The hose with a cap fitting according to any one of claims 1 to 3, wherein an outer diameter of the joint portion is the same in a length direction. The hose with a mouthpiece according to any one of claims 1 to 4, wherein the mouthpiece has a flange at an outer base portion. 6. A hose with a metal fitting according to any one of claims 1 to 5, wherein the rubber hose is a ready-mixed concrete hose reinforced with a reinforcing wire and a fiber cord. hose. The base of the rubber hose is formed with a taper that gradually decreases in diameter from the base to the tip, and the inner diameter of the tip is the same as the inner diameter of the base of the rubber hose. A fitting having a joint portion having one or two or more annular prevention protrusions in the direction is inserted, fixed by baking, and then tightened by a pressure clamp from the outside of the rubber hose. A method for manufacturing a hose with a fitting. The base of the rubber hose is formed with a taper that gradually decreases in diameter from the base to the tip, and the inner diameter of the tip is the same as the inner diameter of the base of the rubber hose. A hose with a mouthpiece characterized by inserting a fitting having a joint provided with one or two or more annular prevention protrusions in the direction and baking and fixing the rubber hose to the fitting. Production method. The base of the rubber hose is formed with a taper that gradually decreases in diameter from the base to the tip, and the inner diameter of the tip is the same as the inner diameter of the base of the rubber hose. A hose with a mouth metal fitting, characterized by inserting a metal fitting having a joint provided with one or more annular protrusions for preventing slipping in the direction, and fastening the outer side of the rubber hose with a pressure clamp. Method.

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