JP3640307B2 - Braided reinforcement hose connection structure and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is coated with a braided reinforcing layer in which reinforcing wires such as monofilament (monofilament) and metal wires are knitted into a cylinder, and is lightweight, flexible, slippery, pressure resistant, such as a high-pressure air hose used outdoors, for example. The present invention relates to a connection structure of a braided reinforcement hose having excellent properties and a method for manufacturing the same .
Specifically, a braided reinforcement hose in which a connecting cylindrical cap is integrally attached to a connection end of a hose in which a reinforcement layer in which a reinforcing wire is knitted on the outer periphery of a soft synthetic resin hose body is covered in a non-contact state. The present invention relates to a connection structure and a manufacturing method thereof .
[0002]
[Prior art]
Conventionally, as a connection structure of this type of braided reinforcement hose and a manufacturing method thereof, as disclosed in, for example, Japanese Patent Laid-Open No. 10-160063, a bamboo hose-shaped metal hose nipple (inner collar) is provided on the inner periphery of the hose body. The hose body is inserted into the outer peripheral surface of the hose nipple by inserting and caulking the metal caulking pipe (outer collar) along the outer peripheral surface of the braided reinforcing layer (knitted reinforcing layer). And what fixes the braided reinforcing layer is common.
[0003]
[Problems to be solved by the invention]
However, in such a conventional braided reinforcement hose connection structure and its manufacturing method , since the braided reinforcement layer is sandwiched between the hose body and the caulking pipe and is simply brought into surface contact, it is easy to slide. If force is applied to the reinforcement layer in the pulling direction from the caulking pipe, the braided reinforcement layer can be easily pulled out from the caulking pipe, causing loosening of the caulking connection and causing hose disconnection or leakage. If the connection end of the hose body is exposed as the braided reinforcing layer is removed, the pressure resistance of this exposed part is significantly lower than that of the portion covered with the other braided reinforcing layer, so there is a risk of puncture. There's a problem.
Furthermore, when the caulking pipe is put on the connection end of the braided reinforcing layer, not only is the reinforcing wire located at the tip of the braided reinforcing layer scattered due to the contact of both of them, but it is difficult to insert the caulking pipe and workability is poor. If the caulking cap is forcibly covered to the tip of the braided reinforcing layer where the reinforcing wire is broken, the reinforcing wire may be partially concentrated in a part of the circumferential direction to form a lump. In such a case, there is a problem that not only crimping may be insufficient or uneven, but also the hose body may be damaged.
Moreover, since metal hose nipples and caulking pipes are used, there is a problem that they become heavy.
[0004]
Among the present inventions, the invention described in claim 1 aims to obtain even higher pull-out strength .
An object of the present invention is to make it possible to easily confirm the position of the hose connection end portion after molding while increasing the pull-out strength without the tip portion of the braided reinforcing layer being scattered .
In addition to the object of the invention described in claim 2 , the invention described in claim 3 aims to maintain the adhesive strength between the hose and the cylindrical cap in a high state.
The invention described in claim 4 is intended to further improve the hose deformation preventing function and the hose disconnection preventing function in addition to the object of the invention described in claim 2 or 3.
[0005]
[Means for Solving the Problems]
In order to achieve the above-described object, the invention described in claim 1 of the present invention is that a see-through hole 1a is formed in a cylindrical cap 1, and the reinforcing wire Hb of the braided reinforcing layer Hc is a monofilament. The main body Ha is formed of the same type of synthetic resin as the molten resin R.
In the invention according to claim 2, the hose connection end H1 is loaded into the molds A and B, and the pressing part 2a is projected from the inner surfaces of the molds A and B toward the hose connection end H1. The molten resin R is injected while the hose connection end H1 is immovably supported by the pressing portion 2a, and the cylindrical cap 1 is insert-molded so that the cut surface H2 of the hose H is covered. Is characterized in that the see-through hole 1a is opened in the cylindrical cap 1 by removing the pressing portion 2a from the cylindrical cap 1 .
The invention according to claim 3 is the configuration according to the invention according to claim 2 , wherein the insert pipe P is inserted along the inner peripheral surface of the hose connection end H1 and loaded into the molds A and B. It is characterized by adding.
According to a fourth aspect of the present invention, in the configuration of the second or third aspect of the present invention, a gate G for injecting the molten resin R into the molds A and B is disposed on the base side of the cylindrical cap 1. The construction is such that a molten resin R is injected from the gate G toward the distal end side of the hose connection end H1.
[0006]
[Action]
According to the first aspect of the present invention, the monofilament of the reinforcing wire Hb made of a homogeneous synthetic resin, the hose body Ha, and the molten resin R are integrated with high adhesive strength .
The invention of claim 2 is a braided reinforcing layer in which the molten resin R is easily broken by injecting the molten resin R into the molds A and B while supporting the hose connection end H1 so as not to move by the pressing portion 2a. The tip portion of Hc is pressed against the hose body Ha side, enters the hose body Ha side from the knitting gap of the braided reinforcing layer Hc, is cured while being integrated, and the cylindrical cap 1 is insert-molded. By pulling out the pressing portion 2a from the molded cylindrical cap 1 and opening the see-through hole 1a, the hose connection end H1 in the cylindrical cap 1 can be seen through the see-through hole 1a.
Invention of Claim 3 adds the structure loaded in metal mold | die A and B in the state which inserted the insert pipe P along the internal peripheral surface of the said hose connection edge part H1 with respect to the structure of Claim 2. Therefore, the cylindrical cap 1 is insert-molded outside the hose connection end H1 across the insert pipe P, so that the hose connection end H1 is shaped and fixed by the insert pipe P even if the hose H is bent. Does not deform.
According to the invention of claim 4, the gate G for injecting the molten resin R into the molds A and B is arranged on the root side of the cylindrical cap 1 with respect to the configuration of claim 2 or 3. Since a configuration in which the molten resin R is injected from the gate G toward the tip side of the hose connection end H1 is added, the molten resin R is supplied from the gate G arranged on the base side of the cylindrical cap 1 to the hose connection end. By injecting toward the front end side of H1, the hose connection end portion H1 and the front end portion of the braided reinforcing layer Hc, which are easily broken, are difficult to turn and the hose push-back in the reverse direction is reduced.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
In this embodiment, as shown in FIGS. 1 to 3, the hose H is coated in a non-contact state with a braided reinforcing layer Hc in which a monofilament is knitted into a cylindrical shape as a reinforcing wire Hb on the outer periphery of a soft synthetic resin hose body Ha. The pressure resistant hose is inserted into a pair of molds A and B which are supported so as to be separable facing each other, with the insert core pin C fitted inside the connection end H1, and the molten resin R is loaded therein. The case where the cylindrical cap 1 is insert-formed along the hose cut surface H2 and the outer peripheral surface H3 of the braided reinforcing layer Hc by injection at a high pressure is shown.
[0008]
Further, in the case of the illustrated example, as shown in FIGS. 1 and 2, two cavities A1, A2, B1, and B2 having different shapes are respectively provided in the molds A and B so as to be opposed to each other, and hose is provided in these cavities. Two cylindrical caps 1 and 1 are integrally molded at the same time by loading and inserting insert connecting ends H1 and H1 at both ends located on the opposite side of H.
[0009]
On the inner surfaces of the molds A and B, a pressing portion 2a is protruded toward the hose connection end H1.
In the present embodiment, through holes 3 are opened in the molds A and B toward the respective hose connection ends H1, and the protruding lengths corresponding to the thicknesses of the different types of hoses H are formed inside the through holes 3. By inserting different pressing pins 2 interchangeably and supporting them so as not to move, the pressing portions 2a formed at the tips of the pressing pins 2 are projected into the molds A and B.
[0010]
At the time of insert molding, the molten resin R is injected while pressing the hose connection end H1 loaded in the molds A and B with the pressing part 2a protruding into the molds A and B so as not to move. After the cylindrical cap 1 is formed and the insert molding is performed, the pressing portion 2a is removed from the cylindrical cap 1, and the see-through hole 1a is opened in the cylindrical cap 1.
[0011]
In the case of the illustrated example, as shown in FIGS. 1 and 2, there are four through holes 3 at positions facing the cavities A1, A2, B1, B2 from the outside of the molds A, B to the insert core pin C. The pressing pins 2 are supported so as not to move toward the insert core pins C in the through holes 3.
[0012]
Further, a gate G for injecting the molten resin R into the molds A and B is disposed on the base side of the cylindrical cap 1, and the molten resin R is connected to the hose connection end H1 from the gate G. Inject toward the tip of the tube.
[0013]
In the case of the illustrated example, the gate G is only on one of the movable side or fixed side molds A and B, for example, only on the peripheral walls of the cavities B1 and B2 recessed in one mold B as shown in FIG. A pair is arranged at a position that intersects and opposes the insertion direction of the pressing pins 2a, 2a.
[0014]
In the case of the present embodiment, a nut D1 and a screw cylinder D2 having a hexagonal cross section are integrally formed as a joint D for connection to another machine on the cylindrical cap 1, and the hose connection end H1. Are inserted into the molds A and B with the insert pipe P inserted between the inner peripheral surface of the mold and the insert core pin C.
[0015]
The insert pipe P is formed to be approximately the same as or longer than the axial dimension of the cylindrical cap 1 to be integrally molded, and is disposed at a position where the cylindrical cap 1 is integrally molded, or the cylindrical cap 1 It is preferable to project from one end or both ends in the axial direction.
Further, on the outer peripheral surface of the insert pipe P, a positioning line C1 of the hose connection end H1 is displayed, and if necessary, in order to prevent the insert pipe P from coming out of the cylindrical cap 1 after insert molding, for example, knurl It is preferable to provide the retaining means P1.
[0016]
Next, a method for manufacturing such a braided reinforcing hose connection structure will be described in accordance with a procedure.
First, after the insert pipe P is mounted along the outer peripheral surface of each insert core pin C, the hose connection end H1 is inserted up to the positioning line C1 displayed on the outer peripheral surface.
[0017]
The base end C2 of the insert core pin C is set so as not to move with respect to one of the separated molds A and B, and the molds A and B are moved close to each other so that the hose is connected to the predetermined position. The end H1 is loaded.
[0018]
In the case of the illustrated example, connection ends H1 and H1 located at both ends of the hose H are simultaneously loaded into a set of cavities A1, A2, B1, and B2 that are recessed in the molds A and B.
[0019]
In this state, the hose connection ends H1, H1 between the insert core pins C, C and the insert pipes P, P at the pressing portions 2a ... projecting into the cavities A1, A2, B1, B2 of the molds A, B. Is pressed so as not to move, and molten resin R is injected into the cavities A1, A2, B1, and B2 from the gate G.
[0020]
As a result, even if the molten resin R is injected at a high pressure, the hose connection ends H1 and H1 do not move, and the end portions of the braided reinforcing layers Hc and Hc where the molten resin R is likely to be loosened are directed to the hose bodies Ha and Ha. Since it presses, uniform connection strength is obtained, without the front-end | tip part of the braiding reinforcement layers Hc and Hc varying.
In addition to this, the molten resin R enters the hose body Ha, Ha side from the knitting gaps of the braided reinforcing layers Hc, Hc, and cures while integrating them, so that the cylindrical caps 1, 1 are insert-molded. Therefore, even if a force acts on the braided reinforcing layers Hc, Hc in the direction of pulling out from the cylindrical caps 1, 1, a high pull-out strength is exhibited.
As a result, hose deformation and hose removal during insert molding can be prevented.
[0021]
Further, in the case of this embodiment, the gate G is arranged on the base side of the cylindrical cap 1, and the molten resin R is injected from the gate G toward the distal end side of the hose connection end portions H1 and H1. .
[0022]
As a result, the hose connection ends H1 and H1 and the tip portions of the braided reinforcing layers Hc and Hc that are easily broken are difficult to turn and the hose push-back in the reverse direction is reduced.
As a result, the hose deformation prevention function and the hose removal prevention function can be further improved.
[0023]
Further, in the case of the present embodiment, after the insert molding, if the molds A and B are separated and moved, the pressing portions 2a... In the caps 1 and 1, see-through holes 1a are opened.
[0024]
Thereby, as shown in FIG. 3, the reinforcing wire Hb of the hose connection end H1 can be seen through the see-through holes 1a, 1a formed in the respective cylindrical caps 1, or the pressing portions of the pressing pins 2, 2. When the hose body Ha is exposed at 2a, 2a, this can be seen through the transparent holes 1a, 1a.
As a result, the position of the hose connection end after insert molding can be easily confirmed.
[0025]
The cylindrical caps 1 and 1 integrally molded in this way complete the molding process by separating the molds A and B and then pulling out the insert core pins C.
[0026]
Further, in the case of the present embodiment, the cylindrical cap 1 is insert-molded outside the hose connection end H1 with the insert pipe P interposed therebetween, so that even if the hose H is bent, the hose connection end H1 is not bent. The shape is fixed by the insert pipe P and does not deform.
As a result, there is an advantage that the adhesive strength between the hose H and the cylindrical cap 1 can be maintained in a high state.
[0027]
Further, as shown in the illustrated example, when the insert pipe P is projected from one end of the cylindrical cap 1 or extended to the vicinity of the end, the braided reinforcing hose H is connected over the entire length of the cylindrical cap 1. When the end portion H1 is shaped and the hose connection end portion H1 can be prevented from being bent and extended toward the nut portion D1 and the screw cylinder portion D2 of the joint D arranged in the opposite direction, the nut portion D1 is provided. And the screw cylinder part D2 can be reinforced.
[0028]
On the other hand, what is shown in FIG. 4 is another embodiment of the present invention.
This is a structure in which the insert core pin C is directly fitted in the molds A and B without inserting the insert pipe P along the inner peripheral surface of the hose connection end H1. Unlike the embodiment shown in FIG. 1, the other configuration is the same as the embodiment shown in FIGS.
In this case, as shown in the drawing, it is necessary to display the positioning line C1 of the hose connection end H1 on the outer peripheral surface of the insert core pin C instead of the outer peripheral surface of the insert pipe P.
[0029]
Therefore, the shape shown in FIG. 4 cannot be expected to retain the shape of the hose connection end H1 by the insert pipe P as compared with the embodiment shown in FIGS. .
[0030]
In the previous embodiment, the hose H is a pressure-resistant hose in which the outer periphery of a soft synthetic resin hose body Ha is coated with a braided reinforcing layer Hc in which a monofilament is knitted in a cylindrical shape as a reinforcing wire Hb in a non-contact state. However, the present invention is not limited to this, and it may be a hose having the same structure, such as a pressure hose covered with a braided reinforcing layer Hc using a metal wire such as a piano wire instead of a monofilament. The same effect as the previous embodiment can be obtained.
Moreover, although the case where the nut part D1 and the screw cylinder part D2 of hexagonal cross section were integrally formed as the joint D for connecting to the cylindrical cap 1 to another machine was shown, it is not limited to this, A joint with a different shape is integrally formed, or a cap nut (joint fitting) is rotatably engaged as shown in FIG. 2 of JP-A-10-160063, for example, without integrally forming such a joint. You may integrally mold the collar part to perform.
[0031]
Further, the pressing pin 2 is inserted into the inside of the through hole 3 opened in the molds A and B and supported so as not to move, so that the pressing portion 2a formed at the tip of the pressing pin 2 is projected. Although not limited to this, although not shown, for example, the pressing portion 2a may be integrally formed on the inner surfaces of the molds A and B without opening the through hole 3, or the pressing portion 2a formed separately may be fixed. .
Furthermore, by connecting the connecting ends H1, H1 located at both ends of the hose H to a set of cavities A1, A2, B1, B2 recessed in the molds A, B at the same time, two cylindrical shapes are obtained. Although the case where the caps 1 and 1 are integrally formed at the same time is shown, the present invention is not limited to this, and only the connecting end H1 located on one side of the hose H is loaded and only one cylindrical cap 1 is integrally formed. Also good.
[0032]
【The invention's effect】
As described above, the invention according to the first aspect of the present invention is because the monofilament of the reinforcing wire Hb made of a homogeneous synthetic resin, the hose body Ha, and the molten resin R are integrated with high adhesive strength. A higher pulling strength can be obtained.
[0033]
The invention of claim 2 is a braided reinforcing layer in which the molten resin R is easily broken by injecting the molten resin R into the molds A and B while supporting the hose connection end H1 so as not to move by the pressing portion 2a. The tip portion of Hc is pressed against the hose body Ha side, enters the hose body Ha side from the knitting gap of the braided reinforcing layer Hc, is cured while being integrated, and the cylindrical cap 1 is insert-molded. By pulling out the pressing portion 2a from the molded cylindrical cap 1 and opening the see-through hole 1a, the hose connection end H1 in the cylindrical cap 1 can be seen through the see-through hole 1a. The position of the hose connection end H1 after molding can be easily confirmed while increasing the pull-out strength without the tip portion of Hc being scattered.
Therefore, the braided reinforcement layer is sandwiched between the hose body and the caulking pipe, and it does not move even if a force acts in the pulling direction to pull out the braided reinforcement layer compared to the conventional one that is easy to slide by simply contacting the surface. In addition to reliably preventing hose disconnection and leakage, it is possible to prevent puncture due to exposure of the connecting end of the hose body.
Furthermore, since the tip end portion of the reinforcing wire of the braided reinforcing layer does not vary, the workability is improved and the working time can be shortened, which is economical and the hose body is not damaged.
Moreover, since no metal hose nipple or caulking pipe is used, the weight can be reduced accordingly.
[0034]
In addition to the effect of the invention of claim 2 , the invention of claim 3 is formed by bending the hose H by inserting the cylindrical cap 1 outside the hose connection end H1 across the insert pipe P. Since the hose connection end H1 is shaped and fixed by the insert pipe P and does not deform, the adhesive strength between the hose and the cylindrical cap can be maintained at a high level.
[0035]
According to the invention of claim 4, in addition to the effect of the invention of claim 2 or 3, the molten resin R is injected from the gate G arranged on the base side of the cylindrical cap 1 toward the tip side of the hose connection end H1. By doing so, the hose connection end portion H1 and the tip portion of the braided reinforcing layer Hc, which is easily broken, are difficult to turn over, and hose pushback in the reverse direction is reduced, so that the hose deformation prevention function and the hose disconnection prevention function can be further improved.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view of a braided reinforcing hose connection structure according to an embodiment of the present invention, showing an insert molding time.
FIG. 2 is a reduced transverse plan view of FIG. 1;
FIG. 3 is a perspective view of a finished product.
FIG. 4 is a vertical side view of a braided reinforcement hose connection structure showing another embodiment of the present invention, and shows a state during insert molding.
[Explanation of symbols]
A, B Mold H hose (Laminated hose)
H1 Hose connection end H2 Hose cut surface Ha Hose body Hb Reinforcing wire rod Hc Braided reinforcing layer G Gate P Insert pipe R Molten resin 1 Cylindrical cap 1a Perspective hole 2a Pressing portion

Claims (4)

A molten resin is applied to the connecting end (H1) of the hose (H) in which the outer periphery of the soft synthetic resin hose body (Ha) is coated with the braided reinforcing layer (Hc) in which the reinforcing wire (Hb) is knitted in a non-contact state. In the connection structure of the braided reinforcement hose to which the connecting cylindrical cap (1) made of (R) is integrally attached,
Opened perspective holes (1a) before Symbol tubular cap (1), a reinforcing wire of the braided reinforcement layer (Hc) (Hb) is the monofilament, the monofilament and hose body (Ha) of the molten resin (R) Connection structure of braided reinforcement hose characterized by being made of the same type of synthetic resin . For connection to the connection end (H1) of the hose (H) in which the reinforcement layer (Hc) in which the reinforcing wire (Hb) is knitted on the outer periphery of the soft synthetic resin hose body (Ha) is coated in a non-contact state. In the manufacturing method of the connection structure of the braided reinforcement hose to which the cylindrical cap (1) is integrally attached,
The hose connection end (H1) is loaded into the mold (A, B), and the pressing part (2a) is projected from the inner surface of the mold (A, B) toward the hose connection end (H1). The molten resin (R) is injected while the hose connection end (H1) is immovably supported by the pressing portion (2a) so that the cut surface (H2) of the hose (H) is covered. The cylindrical cap (1) was insert-molded, and after this insert molding, the pressing portion (2a) was removed from the cylindrical cap (1) and a transparent hole (1a) was opened in the cylindrical cap (1). A manufacturing method of a connection structure of a braided reinforcement hose characterized by the above . The manufacturing method of the connection structure of the braided reinforcement hose of Claim 2 with which it inserts in a metal mold | die (A, B) in the state which inserted the insert pipe (P) along the internal peripheral surface of the said hose connection end part (H1). . A gate (G) for injecting the molten resin (R) into the molds (A, B) is disposed on the base side of the cylindrical cap (1), and the molten resin (R) is provided from the gate (G). The manufacturing method of the connection structure of the braided reinforcement hose of Claim 2 or 3 which inject | poured toward the front end side of the hose connection end part (H1).

Images