JPH1078185A - Mounting method and device for hose ferrule - Google Patents

Abstract

PROBLEM TO BE SOLVED: To expand the inner sleeve of a hose ferrule using a weak force, finely adjusting the expanded diameter of the inner sleeve depending on a hose diameter dispersion, and demount a drum mold from the inner sleeve using a weak force after a tube expansion process. SOLUTION: This mounting method inserts the end of a hose 3 in space between the inner sleeve 11 and outer sleeve 12 of a hose ferrule 10, and radially expands the part 11a of the inner sleeve 11 in contact with the internal surface of the hose 3, thereby positioning the end of the hose 3 between the inner sleeve 11 and the outer sleeve 12. In this case, a cylinder mold 13 formed out of a plurality of segments 14 to have an approximately cylindrical external surface and an internal surface as a conical surface 14a having a diameter expanded from the lengthwise intermediate part to both ends, is inserted in the inner sleeve 11, and cone type core molds 16 and 17 having tapers equal to the internal surface of the mold 13 are pressed in for contact with both internal surfaces of the drum mold 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for attaching a joint base to an end of a hose made of rubber or synthetic resin.

[0002]

2. Description of the Related Art As shown in FIG. 4, a base for a joint attached to an end of a hose made of rubber or synthetic resin comprises an inner sleeve 1 and an outer sleeve 2 made of metal. An end of the hose 3 is inserted between the inner sleeve 1 and the outer sleeve 2 so that the end of the hose 3 is inserted between the inner sleeve 1 and the outer sleeve 2. Have been. In the example of FIG. 4, the inner sleeve 1 is formed separately from the outer sleeve 2 and longer than the outer sleeve 2, and the hose 3 of the inner sleeve 1 is formed.
On the outer surface of the left half (insertion portion) 1a inserted into the insertion portion 1a, a number of circumferential ridges having a sawtooth cross section are provided. Is provided. Further, the outer sleeve 2 is connected to the above-described insertion portion 1.
It is formed to have a length substantially equal to a. In addition, hose 3
Is formed by spirally winding a reinforcing cord 3b made of vinyl chloride resin around the outer surface of a rubber pipe 3a.

As means for expanding the diameter of the insertion portion 1a of the inner sleeve 1, the inner sleeve 1 is fixed by an arbitrary means, and a tube expanding jig 4 having a circular cross section inserted in advance inside the hose 3 is used. A method is known in which a hydraulic cylinder (not shown) is pulled rightward through a rod 5 connected to the jig 4 to press-fit the above-mentioned tube expanding jig 4 into the inner sleeve 1. However, this press-fitting method uses a pipe expanding jig 4.
A very large force is required to pull the inner sleeve, and this force is applied to the inner sleeve in the axial direction. When the diameter becomes about 150 mm as in the hose used for the shield method, the above force reaches several tens of tons. The inner sleeve 1 was sometimes damaged. Further, in the above method, since the finished diameter of the inner sleeve expanded by the expansion is determined only by the outer diameter of the expansion jig 4, even if the inner diameter of the hose varies, the finished diameter of the inner sleeve 1 is adjusted in accordance with the variation. Fine adjustment was not possible, and therefore, the pinching force of the end of the hose 3 between the inner and outer sleeves 1 and 2 was likely to vary.

As shown in FIG. 5, a conical surface having a plurality of segments 6a, an outer surface formed substantially in a cylindrical shape, and an inner surface having a diameter increasing on the distal end side of the inner sleeve 1 is formed inside the inner sleeve 1. Is fixed by any means, and a cone-shaped core mold 7 corresponding to the above-mentioned conical surface is inserted therein, and this core mold 7 is connected to a rod 8. A method is known in which the cylindrical portion 6 is moved in the radial direction by pulling in the axial direction by a hydraulic cylinder (not shown) through the tubing to expand the insertion portion 1a of the inner sleeve 1. An elastic ring 9 such as a rubber band or an endlessly connected coil spring is connected to circumferential grooves provided at both ends of the cylindrical mold 6.
Are attached, and a plurality of segments 6a constituting the cylindrical mold 6
Is bundled. In this example, a flange 1d is provided on the outer surface of the conical portion 1b of the inner sleeve 1, and the outer sleeve 2
The flanges 2a are fixed to the inner surfaces of the hoses 3, respectively, and the engagement of the flanges 1d and 2a prevents the hose 3 from coming off.

[0005] The method using the cylindrical mold 6 shown in FIG.
By reducing the taper of the core mold 7 and the core mold 7,
Generates a large radial force in the cylindrical mold 6 with a small axial force applied to
Can be expanded, so that damage to the inner sleeve 1 can be prevented, and by controlling the pulling force of the core mold 7, the expansion diameter of the inner sleeve 1 can be finely adjusted according to the variation in the hose diameter. In addition, the clamping force of the hose 3 by the sleeves 1 and 2 can be made uniform. However,
According to this method, if the taper is reduced and the force applied to the core mold 7 is weakened, the core mold 7 does not escape only by returning the hydraulic pressure of the hydraulic cylinder to zero after the expansion, and a large force is required for the escape. This makes it difficult to remove the cylindrical mold 6.

[0006]

SUMMARY OF THE INVENTION The present invention is an improvement of the conventional method using a cylindrical mold and a core mold, and the inner sleeve of the hose mouthpiece can be expanded with the same weak force as the conventional method. Provided is a method and an apparatus for mounting a base of a hose, which can finely adjust the expanded diameter of the inner sleeve in accordance with the variation of the hose diameter, and can easily remove the tubular mold from the inner sleeve with a small force after the expansion is completed. Is what you do.

[0007]

According to a method of mounting a hose base according to the present invention, a hose end is inserted between an inner sleeve and an outer sleeve of a hose base, and a portion of the inner sleeve which is in contact with the inner surface of the hose has a radius. In a method for mounting a hose base, which expands in a direction and clamps a hose end between an outer sleeve and an inner sleeve, an outer surface is formed into a substantially cylindrical shape with a plurality of segments inside the inner sleeve, and an inner surface is formed. Inserting a cylindrical mold formed in a conical surface whose diameter increases from the middle in the longitudinal direction toward both ends, and press-fitting a conical core mold having a taper equal to the inner surface into both inner surfaces of the cylindrical shape. It is characterized by.

According to the method of the present invention, the inner surface on one end side and the inner surface on the other end side of the cylindrical mold to be used are formed in opposite conical surfaces such as conical surface and pyramid surface. When the taper of the conical surface on both sides of the cylindrical mold is made equal to the taper of the cylindrical mold 6 in FIG. 5 respectively, the core mold is pressed into the cylindrical mold with a weak axial force of 1/2 in FIG. can do. Therefore, even if the taper is increased to about twice the taper of the cylindrical type shown in FIG. 5, the core type can be pressed into the cylindrical type with substantially the same axial force as that shown in FIG. By setting the size to a suitable size, the above press-fitting can be facilitated, and the tubular mold can be easily removed after the end of the tube expansion. According to experiments, the size of the taper is 1/2 to 1/5, particularly 1 / 2.5 to 1/3.
5 is preferable. When it is larger than 1/2, it becomes difficult to press-fit the core mold into the tube at the time of expanding the tube.

On the other hand, the point of converting the axial movement of the core into the radial movement of the cylinder is the same as the method using the conventional cylinder, so that even if the hose diameter varies, the force applied to the core can be increased. With this, it is possible to finely adjust the expanded diameter of the inner sleeve.
It is preferable to use a hose base having one end of the outer sleeve fixed to the outer surface of the inner sleeve. In this case, since the outer sleeve is integrated with the inner sleeve, handling when the base is attached to the hose is preferred. Is easy, the workability is improved, and it becomes difficult for the hose to come out after the base including the inner sleeve and the outer sleeve is attached to the hose.

Further, in the hose base mounting apparatus according to the present invention, a hose end is inserted between the inner sleeve and the outer sleeve of the hose base, and a plurality of inner sleeves are provided inside a portion of the inner sleeve which comes into contact with the inner surface of the hose. A hose base mounting device which inserts a cylindrical tubular mold composed of segments and expands the tubular mold by radial movement of each segment so that the end of the hose is clamped between the outer sleeve and the inner sleeve. In the above, the inner surface of the cylindrical shape composed of the plurality of segments is formed as a conical surface whose diameter increases from the middle in the length direction toward both ends, and the inner surface at one end and the other end of the cylindrical shape has a taper equal to the inner surface. Insert a conical core mold with
It is characterized in that one core mold is moved forward and backward in the axial direction while one core mold is fixed.

In this apparatus, an inner sleeve of a hose base is attached to an outer surface of a cylindrical mold, and an end of the hose and an outer sleeve are fitted on the inner sleeve in order, and one core mold is fitted to the other. When the core molds are brought close to each other, the inner sleeve is pushed apart by the one core mold and the other core mold, and the hose end is sandwiched between the inner sleeve and the outer sleeve. Then, when the external force applied to the core mold is loosened after the clamping, the contraction force of the inner sleeve acts, and this assists the extrusion of the core mold, so that the core mold can be easily removed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 3 denotes the above-mentioned hose, which is formed by spirally winding a reinforcing cord 3b made of vinyl chloride resin around an outer surface of a rubber pipe 3a having an inner diameter of 50 to 200 mm. ing. The joint base 10 fixed to the end of the hose 3 includes an inner sleeve 11 and an outer sleeve 12.
The inner sleeve 11 includes an insertion portion 11a, a conical portion 11b, and a joint portion 11c as in the example of FIG.
The outer sleeve 12 has a conical portion 12a at one end, and the end of the conical portion 12a is connected to the outer surface of the conical portion 11b of the inner sleeve 11 by welding, and the above-described hose is connected between the inner sleeve 11 and the outer sleeve 12. A gap is formed in which the end of No. 3 can be inserted.

The cylindrical mold 13 is formed in a cylindrical shape by a plurality of, preferably 6 to 12 segments 14 as shown in FIG. 2, and the inner surface is formed from the middle to both ends in the longitudinal direction as shown in FIG. Is formed on the conical surface 14a whose inner diameter increases toward the center, and its taper is 1/2 to 1/5, preferably 1
/2.5 to 1 / 3.5. A stretchable elastic ring 15 made of rubber or a coil spring is fitted in a concave portion 14b provided on the outer surface of both ends of the segments 14 over all of the segments 14, and the segments 14 are urged in the diameter reducing direction to be bundled. ing.

A cone-shaped core mold 1 having the same taper on the left and right conical surfaces 14a of the cylindrical mold 13 as the conical surface 14a.
6 and 17 are inserted in opposition, a flange 17a protruding from the large-diameter side of the fixed-side core mold 17 located on the right side is fixed to a frame (not shown), and a movable-side core located on the left side. Rod 16a connected to the small diameter side of mold 16
Is slidably penetrated through the center hole 17b of the fixed core 17 and connected to a piston rod of a hydraulic cylinder (not shown).

In the above structure, the base 1 is placed on the cylindrical mold 13.
The inner sleeve 11 of the base 10 is fitted with the joint portion 11c first (to the right in the drawing).
The end of the hose 3 is inserted between the outer sleeve 12 and the outer sleeve 12. Next, the hydraulic cylinders for driving the core molds 16 and 17 are driven, and the movable core mold 16 is pulled through the rod 16a.
When the cylindrical mold 13 is press-fitted into the cylindrical mold 13, the cylindrical mold 13 moves rightward and spreads in the radial direction so that the amounts of entry of the left and right core molds 16 and 17 into the cylindrical mold 13 are equal to each other. Expands, thereby increasing the inner sleeve 11
The end of the hose 3 is clamped between the outer sleeve 12 and the outer sleeve 12. FIG. 3 shows a state in which the base 10 is attached to the hose 3.

In this case, since the pinching force at the end of the hose 3 can be controlled by the hydraulic pressure of the hydraulic cylinder, the pipe expansion operation is stopped when the hydraulic pressure reaches a predetermined value, so that the diameter of the hose 3 varies. Also, this hose 3 has a base 1
0 can always be fixed with a constant pinching force. When the hydraulic pressure is returned to zero, the contraction force of the base 10 pushes the core dies 16 and 17 via the cylindrical mold 13, so that the base 10 can be easily removed. The inner surface of the cylindrical mold 13 and the core mold 1
Although the embodiment in which the outer surfaces of 6 and 17 are formed as conical surfaces has been described, the conical surfaces described above are used for the segments 1 constituting the cylindrical mold 13.
Depending on the number of four, it can be replaced with a hexagonal pyramid or a dodecagonal pyramid.

[0017]

As described above, according to the first aspect of the present invention, by setting the taper of the conical surfaces on both sides of the inner surface of the cylindrical mold to be used to an appropriate size, the insertion of the core mold when the inner sleeve is expanded. The pressure can be set to the same level as in the conventional method in which the inner surface of the cylinder is tapered in one direction, and the removal of the cylinder after the expansion is completed can be made easier than in the conventional method. Also, even if the hose diameter varies, the expansion diameter of the inner sleeve can be finely adjusted by the above-described insertion pressure applied to the core in the same manner as in the above-described conventional method, and a large force is applied to fix the inner sleeve. Since it is not required, the inner sleeve is not damaged during expansion.

The invention described in claim 2 is the same as the invention described in claim 1.
In addition to providing the same effect as the described invention, the inner sleeve and the outer sleeve of the hose base are integrated, so that the base is easy to handle, and the workability when fitting the base to the end of the hose is improved. After the hose is fixed to the end of the hose, it becomes difficult to remove the hose from the mouth.

Further, the invention according to claim 3 can be used to carry out the invention according to claims 1 and 2, and after the inner sleeve of the base is expanded, the core mold can be easily changed from the cylindrical mold to the core mold. It can escape and the base can be easily removed.

[Brief description of the drawings]

FIG. 1 is a sectional view of an apparatus showing an embodiment.

FIG. 2 is a side view of a cylindrical mold.

FIG. 3 is a sectional view showing a state in which a mouthpiece is attached to an end of a hose.

FIG. 4 is a cross-sectional view illustrating a first conventional method.

FIG. 5 is a cross-sectional view illustrating a second conventional method.

[Explanation of symbols]

 3: Hose 10: Base 11: Inner sleeve 11a: Insertion part 11b: Conical part 11c: Joint part 12: Outer sleeve 12a: Conical part 13: Tubular type 14: Segment 14a: Conical surface 15: Elastic ring 16, 17: Core Mold 16a: Rod 17a: Flange 17b: Center hole

Claims (3)

[Claims] 1. A hose end is inserted between an inner sleeve and an outer sleeve of a hose base, and a portion of the inner sleeve contacting the inner surface of the hose is radially expanded so that the hose end is connected to the outer sleeve and the inner sleeve. In the method of attaching a hose base to be clamped between the inner sleeve and the inner sleeve, the outer surface is formed in a substantially cylindrical shape with a plurality of segments, and the inner surface increases in diameter from the middle in the length direction to both ends. A method of attaching a mouthpiece to a hose, comprising: inserting a cylindrical mold formed on a surface thereof; and press-fitting a conical core mold having a taper equal to the inner surface into both inner surfaces of the cylindrical mold. 2. The hose base mounting method according to claim 1, wherein a hose base having one end of an outer sleeve fixed to an outer surface of an inner sleeve is used. 3. A hose end portion is inserted between an inner sleeve and an outer sleeve of a hose base, and a cylindrical tubular mold having a plurality of segments is inserted inside a portion of the inner sleeve that contacts the inner surface of the hose. In a hose base mounting device in which this cylindrical mold is expanded by radial movement of each segment so that the end of the hose is sandwiched between the outer sleeve and the inner sleeve, the cylindrical mold comprising the plurality of segments is provided. The inner surface of the cylindrical shape is formed as a conical surface whose diameter increases from the middle in the length direction toward both ends, and a conical core mold having an inner surface at one end and the other end of the cylindrical shape having a taper equal to the inner surface is formed in an opposing shape. Characterized in that one of the core molds is fixed and one of the core molds is moved forward and backward in the axial direction.