JP2006258214A - Hose joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hose joint, capable of preventing penetration of fluid through a gap in an end surface of a hose of a double layer structure without discharging the fluid outward. <P>SOLUTION: This hose joint 100 connects the hose 1 of the double layer structure to feed fluid to a feed port provided in a subject device to which the fluid is fed. The hose joint 100 is provided with a joint bolt 30 installed on the feed port, a connector 40 to be engaged with a recess 32 formed at an end part of the joint bolt 30 through an O-ring 50, a joint nut 70 engaged with the joint bolt 30, and a hose ring 60 disposed between the joint nut 70 and the hose 1. The hose is held between the hose ring 60 and the connector 40 to be sealed, and a tip part of the hose 1 is held between the joint bolt 30 and the connector 40 to be sealed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hose joint, and more particularly, to a hose joint that connects a multi-layered hose that supplies a fluid and a supply port provided in a device to which the fluid is supplied.

  In the manufacturing industry and the like, a processing apparatus that performs various types of processing using a fluid such as air or liquid supplied from the outside through a hose is frequently used. For example, a dicing apparatus that cuts a workpiece such as a semiconductor wafer has a chuck table that holds the workpiece by suction, and supplies high-pressure air to a compressor disposed corresponding to the chuck table. The suction pipe connected to the chuck table has a negative pressure to apply a suction force to the chuck table.

  Conventionally, as a hose connected to such a dicing apparatus, for example, as shown in FIG. 6, a wire is provided between an outer layer 1a and an inner layer 1b made of silicone rubber or the like so as to be able to withstand the transport of high-pressure fluid. A hose 1 having a two-layer structure in which a reinforcing material 1c such as is arranged in a mesh shape is used. The two-layered hose 1 is connected to a supply port (connection port) provided in the dicing apparatus using a hose joint.

  For example, as shown in FIG. 7, the conventional hose joint is fitted into the joint bolt 3 attached to the supply port of the dicing device, and fitted into the concave portion of the joint bolt 3 on one side and in the hose 1 on the other side. A connector 4 to be press-fitted, an O-ring 5 fitted to the outer periphery of the connector 4 on the joint bolt 3 side, a hose ring 6 fitted to the outer periphery of the hose 1, and a hose screwed to the joint bolt 3 A joint nut 7 for locking the ring 6. Such a conventional hose joint has a structure in which the hose 1 is sandwiched and sealed between the hose ring 6 and the connector 4.

However, such a conventional hose joint has a product defect such as bubbles or scratches on the inner peripheral surface of the hose 1 when high pressure fluid, for example, high pressure air of about 50 to 100 kg / cm ² is supplied into the hose 1. As shown in FIG. 8, there is a problem that high-pressure air enters the joint between the hose 1 and the connector 4 and leaks out into the sealed space S where the end surface 1d of the hose 1 is located. It was. In addition, air leakage from the joint between the joint bolt 3 and the connector 4 is prevented by the sealing action of the O-ring 5 under normal conditions. However, the sealing action of the O-ring 5 is insufficient or the material becomes fatigued. In some cases, the high-pressure air may pass through the O-ring 5 and leak into the sealed space S.

  As shown in FIG. 8, the leaked high-pressure air enters through a slight gap in the reinforcing material 1c portion on the end surface 1d of the two-layered hose 1, and causes the outer layer 1a and the inner layer 1b of the hose 1 to enter. There is a risk of inflating to separate and bursting.

  As a technique for solving such a problem, for example, Patent Document 1 discloses a technique in which a hole 7a (see FIG. 7) for allowing leaked fluid to escape to the outside is provided at a predetermined position of the joint nut 7. . Thereby, the fluid leaking out as described above is discharged to the outside from the hole 7a of the joint nut 7 to reduce the pressure in the sealed space S, and the leaked fluid does not enter the gap on the end face of the hose 1. In this way, the hose 1 can be prevented from bursting.

JP-A-8-285143

  However, in the conventional hose joint described in Patent Document 1, the leaked fluid is discharged from the hole 7a to the outside of the hose joint. For this reason, there existed a problem that the circumference | surroundings of an apparatus were contaminated with the said fluid, and the problem that it cannot apply, when supplying the fluid (harmful liquid etc.) dangerous to leak itself. The conventional hose joint is a solution that allows fluid leakage, and is not a solution that prevents fluid leakage at the joint. Therefore, a drastic solution for preventing fluid from entering the gap of the end surface 1d of the hose 1 has been desired.

  Accordingly, the present invention has been made in view of the above problems, and its object is to prevent the fluid from entering through the gap between the end faces of the multi-layered structure without discharging the fluid to the outside. Thus, it is an object of the present invention to provide a new and improved hose joint capable of preventing hose rupture.

  In order to solve the above problems, according to a first aspect of the present invention, there is provided a hose joint for connecting a multi-layered hose for supplying a fluid and a supply port provided in a device to which the fluid is supplied. Is done. This hose joint has a joint bolt attached to the supply port; a connector that is connected to the hose on one side and that fits into a recess formed on the end of the joint bolt on the other side via an O-ring; A joint nut to be screwed; and a hose ring disposed between the joint nut and the hose. The hose is sandwiched and sealed between the hose ring and the connector, and the joint bolt and the connector It is characterized by sandwiching and sealing the tip of the hose.

  With this configuration, even if high-pressure fluid leaks from the joint between the hose joint and the connector or the joint between the hose and the connector into the sealed space where the hose end face is located, Since the part is sealed, the fluid can be prevented from entering through the gap at the end face of the hose. Therefore, the hose does not expand and burst. Further, since the structure does not discharge the fluid to the outside of the hose joint, any fluid can be applied without contaminating the periphery of the apparatus.

  Furthermore, since the hose can be sealed at two locations, it is possible to more effectively prevent the fluid from entering through the gap between the end surfaces of the hose and to prevent the fluid from leaking out from the joint between the hose and the connector into the sealed space. .

  Further, a protrusion is formed on the outer periphery of the connector, and the tip of the hose may be sandwiched and sealed between the cylindrical wall surrounding the joint bolt recess and the protrusion of the connector. Thereby, a hose front-end | tip part is inserted | pinched suitably and it can seal reliably.

  As described above, according to the present invention, not only is a multi-layered hose sandwiched and sealed between a hose ring and a connector, but the tip of the hose is also sandwiched between a joint bolt and a connector. Seal. For this reason, even if a high-pressure fluid leaks into the sealed space where the hose end surface is located, the fluid can be prevented from entering through the gap between the hose end surfaces, so that the hose does not expand and burst. Further, since the structure does not discharge the fluid to the outside of the hose joint, any fluid can be applied without contaminating the periphery of the apparatus.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present specification and drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

  First, based on FIG. 1, the whole structure of the dicing apparatus 10 which is an example of the apparatus of the fluid supply object concerning the 1st Embodiment of this invention is demonstrated. FIG. 1 is an overall perspective view showing a dicing apparatus 10 according to the present embodiment.

  As shown in FIG. 1, the dicing apparatus 10 includes, for example, a chuck table 15 that holds a workpiece 12, a cutting unit 20 that cuts the workpiece 12 such as a semiconductor wafer, and a cutting unit moving mechanism (not shown). And a chuck table moving mechanism (not shown).

  The chuck table 15 is, for example, a disk-shaped table having a substantially flat upper surface, and includes, for example, a vacuum chuck mechanism (not shown) for attracting and holding the workpiece 12. In this vacuum chuck mechanism, high-pressure air is supplied to a vacuum generator (combum) arranged corresponding to the chuck table 15 to create a negative pressure in the suction pipe connected to the vacuum chuck. This structure generates a suction force. This high-pressure air is supplied from an external air supply means (a high-pressure pump or the like, not shown) to the dicing apparatus 10 via the hose 1 described later. The chuck table 15 having such a configuration can hold, for example, the workpiece 12 supported by the frame 14 via the wafer tape 13 and stably hold the workpiece 12 by vacuum suction. it can.

  The cutting unit 20 includes a cutting blade 22 attached to a spindle. The cutting unit 20 cuts the workpiece 12 by cutting the workpiece 12 while rotating the cutting blade 22 at a high speed to form an extremely thin kerf. At the time of this cutting, cutting fluid (for example, cutting water) is sprayed and supplied from the cutting fluid supply nozzle provided in the cutting unit 20 to the cutting blade 22 and the processing point, and the cutting blade 22 and the processing point are cooled. At the same time, cutting waste is removed and cleaned. This cutting fluid is also supplied to the dicing apparatus 10 via the hose 1 from an external cutting fluid supply means (a high pressure pump or the like, not shown), like the high pressure air.

  The cutting unit moving mechanism moves the cutting unit 20 in the Y-axis direction. The Y-axis direction is a horizontal direction orthogonal to the cutting direction (X-axis direction), and is, for example, the axial direction of a spindle disposed in the cutting unit 20. By such movement in the Y-axis direction, the cutting edge of the cutting blade 22 can be aligned with the cutting position (cutting line) of the workpiece 12. The cutting unit moving mechanism also moves the cutting unit 20 in the Z-axis direction (vertical direction). Thereby, the cutting depth of the cutting blade 22 with respect to the workpiece 12 can be adjusted.

  During normal dicing, the chuck table moving mechanism reciprocates the chuck table 15 holding the workpiece 12 in the cutting direction (X-axis direction) and feeds the cutting table 22 to the workpiece 12. The cutting edge is operated with a linear trajectory.

  The dicing apparatus 10 having such a configuration moves the workpiece 12 along the cutting line by relatively moving the cutting unit 20 and the chuck table 15 while cutting the cutting blade 22 rotating at a high speed into the workpiece 12. It can be divided into a plurality of chips by cutting into a lattice (that is, dicing).

  Next, a configuration for supplying fluid such as high-pressure air or cutting fluid to the dicing apparatus 10 as described above will be described with reference to FIG. FIG. 2 is an enlarged view showing a connecting portion between the supply port 17 and the hose 1 of the dicing apparatus 10 according to the present embodiment.

  As shown in FIG. 2, for example, on the back surface 16 side of the dicing apparatus 10, a supply for supplying fluid such as high-pressure air or cutting fluid to each part (chuck table 15, cutting unit 20, etc.) of the dicing apparatus 10 described above. For example, a plurality of ports 17 are provided. A plurality of (three in the illustrated example) hoses 1 are connected to the supply ports 17 by hose joints 100, respectively. One of these hoses 1 is a hose that supplies high-pressure air to apply a suction force to the chuck table 15. In the following description, an example of the hose joint 100 connecting the hose 1 for supplying such high-pressure air will be described in detail.

  As shown in FIG. 6, the hose 1 is a two-layered hose (blade hose) in which a reinforcing material 1c is disposed between the outer layer 1a and the inner layer 1b. The outer layer 1a and the inner layer 1b are made of a synthetic resin having a certain degree of elasticity and flexibility, such as silicone rubber. For this reason, the hose 1 can be bent and arranged relatively freely. The reinforcing material 1c is formed of, for example, a synthetic fiber, a metal wire, or the like, and is disposed in a mesh shape between the outer layer 1a and the inner layer 1b. The reinforcing material 1c improves the strength of the hose 1 and can withstand the supply of high-pressure fluid such as high-pressure air.

  The supply port 17 is, for example, an opening having a substantially circular cross section formed on the back surface 16 of the dicing apparatus 10. The supply port 17 communicates with a suction pipe connected to the vacuum chuck of the chuck table 15.

  The hose joint 100 is a hollow joint for connecting the hose 1 to the supply port 17 of the dicing apparatus 10. Below, based on FIGS. 3-5, the hose joint 100 concerning this embodiment is demonstrated in detail. 3 is an exploded perspective view showing the structure of the hose joint 100 according to the present embodiment, and FIG. 4 is a side view (a) and a sectional view (b) showing the hose joint 100 according to the present embodiment. FIG. 5 is a side view (a) and a sectional view (b) showing a state in which the hose 1 and the supply port 17 are connected using the hose joint 100 according to the present embodiment.

  As shown in FIGS. 3 to 5, the hose joint 100 includes a joint bolt 30 attached to the supply port 17, a tip end portion of the hose 1 connected to one side, and a recess 32 of the joint bolt 30 on the other side. The connector 40 to be fitted, the O-ring 50 fitted in the annular groove 42 formed on the outer periphery of the connector 40, the hose ring 60 disposed between the joint nut 70 and the hose 1, and the hose 1 And a joint nut 70 screwed onto the joint bolt 30 in the inserted state.

  The joint bolt 30 is a hollow member formed of, for example, stainless steel. The connector 40 is fitted to one end (the hose 1 side) of the joint bolt 30 and the other end is connected to the supply port 17. It is attached by the screw action. The joint bolt 30 has a male threaded portion 31 formed on the outer periphery of a cylindrical wall 33 provided at the end on the hose 1 side, and the end of the connector 40 is fitted inside the cylindrical wall 33. A concavity 32 is formed.

  The connector 40 is a substantially cylindrical hollow member (insert slip) made of, for example, stainless steel. An outer peripheral surface on one side (the hose 1 side) of the connector 40 is a tapered surface 41 so that it can be easily press-fitted into the hose 1. Further, the outer peripheral surface of the other side of the connector 40 (supply port 17 side) is a roll surface that fits closely with the concave portion 32 of the joint bolt 30 and has a substantially U-shaped cross section for disposing the O-ring 50. An annular groove 42 is formed.

  Further, on the outer peripheral surface of the substantially central portion of the connector 40, a protruding portion 43, which is a feature of the present embodiment, is provided along the circumferential direction. As shown in FIG. 4, the protrusion 43 is formed on the outer peripheral surface of the connector 40 at a position facing the tip portion of the cylindrical wall 33 of the joint bolt 30, and the outer peripheral surface of the connector 40 swells in a step shape. It has such a shape.

  In the conventional connector 4, as shown in FIG. 7, the central portion of the outer peripheral surface has a smoothly inclined shape, and the gap between the joint bolt 3 and the connector 4 is relatively wide. On the other hand, in the connector 40 according to the present embodiment, since the protruding portion 43 protrudes, the gap between the tip end portion of the cylindrical wall 33 of the joint bolt 30 and the protruding portion 43 of the connector 40 is not in the hose 1. It is narrower than the thickness.

  The O-ring 50 is formed of an elastic material such as rubber, for example, and its radial thickness is larger than the depth of the annular groove 42 of the connector 40. For this reason, when the connector 40 in a state where the O-ring 50 is fitted is fitted into the concave portion 32 of the joint bolt 30, the O-ring 50 comes into close contact with the inner peripheral surface of the concave portion 32 of the joint bolt 30. Therefore, the joint portion between the joint bolt 30 and the connector 40 can be sealed by the O-ring 50.

  The hose ring 60 is an annular member (pack ring) formed of a synthetic resin such as plastic. Since the inner diameter of the hose ring 60 is larger than the outer diameter of the hose 1 at the normal time, the hose 1 can be inserted into the hose ring 60. Moreover, the to-be-latched part 61 is protrudingly formed in the one side of the outer peripheral surface of this hose ring 60, and the outer diameter is expanded.

  The joint nut 70 is a nut member made of, for example, stainless steel, and the inner diameter thereof is larger than the outer diameter of the hose 1 at a normal time. On one side (supply port 17 side) of the inner peripheral surface of the joint nut 70, a female screw portion 71 that is screwed with the male screw portion 31 of the joint bolt 30 is formed. Further, a locking portion 72 is formed on the other side (the hose 1 side) of the inner peripheral surface of the joint nut 70 so as to reduce the diameter of the opening. The locked portion 61 is locked. By screwing the joint nut 70 having such a configuration to the joint bolt 30, the hose ring 70 is locked by the locking portion 72 and pressed toward the connector 40, and the hose ring 70 and the connector 40 are hose between the hose ring 70 and the connector 40. 1 can be inserted and fixed.

  A procedure for connecting the hose 1 to the supply port 17 of the dicing apparatus 10 using the hose joint 100 having the above configuration will be described. First, the hose 1 is inserted into the joint nut 70 and the hose ring 60. Next, the connector 40 and the hose 1 are connected by press-fitting the end of the connector 40 having the tapered surface 41 into the tip of the hose 1. Further, the O-ring 50 is fitted into the annular groove 42 at the other end of the connector 40, and the other end of the connector 40 is fitted into the recess 32 of the joint bolt 30. After that, the hose ring 60 in which the hose 1 is inserted in advance as described above is moved to the joint bolt 30 side and pressed strongly against the hose 1 that is connected to the connector 40 and has an enlarged diameter. Further, the joint nut 70 is also moved to the joint bolt 30 side, and the female thread portion 71 on the inner periphery of the joint nut 70 is screwed to the male thread portion 31 on the outer periphery of the joint bolt 30.

  As shown in FIG. 5, the hose joint 100 assembled in this way is between the protrusion 43 of the connector 40 and the cylindrical wall 33 of the joint bolt 30 (first seal portion in FIG. 5). The point is that the tip part is sandwiched and sealed. In addition, the front-end | tip part of the hose 1 is a hose front end side (end surface 1d side) part rather than the location where the hose ring 60 contacts with the hose 1.

  As described above, when the hose joint 100 is assembled, the gap between the protrusion 43 of the connector 40 and the cylindrical wall 33 of the joint bolt 30 is narrower than the thickness of the hose 1. For this reason, the tip of the hose 1 connected to the connector 40 is sandwiched and crushed from both sides by the protruding portion 43 of the connector 40 and the cylindrical wall 33 of the joint bolt 30, and is firmly fixed between the two. Sealed.

  By sealing the tip of the hose 1 with the connector 40 and the joint bolt 30 as described above, even if high-pressure air leaks from the O-ring 50, a slight amount of the reinforcing material 1c portion on the end surface 1d of the hose 1 having the two-layer structure is used. It is possible to suitably prevent high-pressure air from entering through a large gap.

  More specifically, when the sealing action of the O-ring 50 is reduced due to fatigue of the O-ring 50 or the like, the high-pressure air passes through the joint between the joint bolt 30 and the connector 40, and the sealed space S (the joint bolt 30 And the connector 40 and the tip of the hose 1 and may leak into the space where the hose end face 1d is located. However, even in such a case, the tip of the hose 1 is sandwiched between the cylindrical wall 33 of the joint bolt 30 and the protruding portion 43 of the connector 40 as close as possible to the end surface 1d of the hose 1. The outer layer 1a and the inner layer 1b can be firmly adhered to each other. For this reason, the high-pressure air leaking into the sealed space S cannot enter from a slight gap between the outer layer 1a and the inner layer 1b on the hose end surface 1d. Therefore, as shown in FIG. 6, it is possible to reliably prevent the hose 1 from expanding and rupturing due to the pressure of the high-pressure air.

  Furthermore, in the hose joint 100 according to the present embodiment, the hose ring 60 is pressed against the joint bolt 30 by screwing the joint nut 70 to the joint bolt 30, and the end of the hose ring 60 is bitten into the hose 1. Can be made. Accordingly, the hose 1 can be sandwiched and sealed even between the hose ring 60 and the connector 40 (second seal portion in FIG. 5). Therefore, the hose 1 can be sandwiched and sealed between the hose ring 60 and the connector 40 and between the joint bolt 30 and the connector 40 as described above. Therefore, the effect of preventing the high pressure air from entering the hose 1 can be further enhanced.

  In addition, by sealing at two places (first and second seal portions) in this manner, high-pressure air can be prevented from entering from the joint portion between the connector 40 and the hose 1 more reliably, and the sealed space S Needless to say, there is an effect of avoiding the above.

  In addition, the hose joint 100 according to the present embodiment can prevent the hose 1 from bursting without discharging a fluid such as high-pressure air to the outside of the hose joint 100. Therefore, the present invention is applicable not only to not contaminating the periphery of the apparatus with a fluid but also to supplying a fluid (hazardous liquid or gas) that is dangerous to leak.

  Further, the hose joint 100 according to the present embodiment also has an effect that the hose 1 can be prevented from being twisted when the hose 1 is connected because the joint bolt 30 exhibits the function of preventing the hose 1 from rotating.

  More specifically, in the conventional hose joint as shown in FIG. 7, when the hose 1 is connected to the supply port 17, the joint nut 7 is rotated and fastened to the joint bolt 3. Since the ring 7 and the connector 4 also rotate, there is a problem that the hose 1 is twisted.

  On the other hand, in the hose joint 100 according to the present embodiment, when the connector 30 to which the hose 1 is connected is fitted in the recess 33 of the joint bolt 30, the cylindrical wall 33 of the joint bolt 30 contacts the outer periphery of the hose 1. Structure. For this reason, even if the joint nut 70 is rotated when connecting the hose 1, the hose 1 and the connector 30 do not rotate because the joint bolt 30 is in contact with the hose 1. Therefore, twisting of the hose 1 can be prevented and the hose 1 can be suitably connected to the supply port 17.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to this example. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are of course within the technical scope of the present invention. Understood.

  For example, in the above-described embodiment, the example of high-pressure air has been mainly described as the fluid supplied through the hose 1, but the present invention is not limited to such an example. The fluid may be various gases other than air, or various fluids (water, etc.) such as cutting fluid, cleaning fluid, etching fluid, polishing fluid, high-pressure fluid for cutting, and viscosity such as slurry. It may be a body.

  In the above embodiment, an example of the dicing apparatus 10 is given as an apparatus to be supplied with fluid, but the present invention is not limited to such an example. The fluid supply target device may be, for example, a cutting device, a grinding device, a polishing device, an etching device, a water jet cutting device, a laser processing device, or any other device that performs processing using a fluid, a factory facility, or the like.

  Moreover, although the said embodiment demonstrated the example of the hose 1 of the two-layer structure containing the reinforcing material 1c, it is not limited to this example. As long as the hose has a multi-layer structure, the number of layers may be arbitrary, such as a three-layer structure or a four-layer structure. Further, the reinforcing material 1c may be disposed in the hose 1 in any form such as a lattice shape or a stripe shape other than the mesh shape as in the above embodiment. Further, the material of the reinforcing material 1c may be any material other than synthetic fibers and metal wires. The multi-layered hose does not necessarily include the reinforcing material 1c.

  Moreover, in the said embodiment, the front-end | tip part of the hose 1 was pinched | interposed and sealed between the cylindrical wall 33 of the joint bolt 30 and the projection part 43 of the connector 40 which were illustrated in FIG. However, the present invention is not limited to this example, and various design changes can be made as long as the hose 1 is sandwiched between the joint bolt 30 and the connector 40. For example, the shape and arrangement of the protrusions 43 are not limited to the illustrated example, and various design changes can be made. In addition, the hose 1 may be sandwiched by providing a protrusion on the inner periphery of the joint bolt 30 without providing the protrusion 43 on the connector 40.

  Moreover, although the hose joint 100 concerning the said embodiment sealed the hose 1 in two places, it is not limited to this example, You may comprise so that the hose 1 can be sealed in three or more places.

  The present invention can be applied to a hose joint that connects a multi-layered hose for supplying a fluid to a supply port provided in a device to which the fluid is to be supplied.

1 is an overall perspective view showing a dicing apparatus according to a first embodiment of the present invention. It is an enlarged view which shows the connection part of the supply port and hose of the dicing apparatus concerning this embodiment. It is a disassembled perspective view which shows the structure of the hose joint concerning the embodiment. They are the side view (a) and sectional drawing (b) which show the hose joint concerning the embodiment. They are the side view (a) and sectional drawing (b) which show the state which connected the hose and the supply port using the hose joint concerning the embodiment. It is a partial notch perspective view which shows the hose of the two-layer structure concerning the embodiment. It is sectional drawing which shows the conventional hose joint. It is sectional drawing which shows the state which the hose expanded by the conventional hose joint.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1: Hose 1a: Outer layer 1b: Inner layer 1c: Reinforcement material 1b: End surface of hose 10: Dicing device 12: Workpiece 15: Chuck table 16: Back surface of dicing device 17: Supply port 20: Cutting unit 22: Cutting blade 30 : Joint bolt 31: Male thread part 32: Recessed part 33: Cylindrical wall 40: Connector 41: Tapered surface 42: Annular groove 43: Projection part 50: O-ring 60: Hose ring 61: Locked part 70: Joint nut 71: Female thread Part 72: Locking part 100: Hose joint S: Sealed space

Claims (2)

In a hose joint that connects a multi-layered hose that supplies fluid and a supply port provided in the fluid supply target device:
A joint bolt attached to the supply port;
A connector connected to the hose on one side and fitted into a recess formed on the end of the joint bolt on the other side via an O-ring;
A joint nut screwed onto the joint bolt;
A hose ring disposed between the joint nut and the hose;
With
The hose is sandwiched and sealed between the hose ring and the connector,
A hose joint characterized in that a tip of the hose is sandwiched and sealed between the joint bolt and the connector. A protrusion is formed on the outer periphery of the connector,
2. The hose joint according to claim 1, wherein a tip of the hose is sandwiched and sealed between a cylindrical wall surrounding the concave portion of the joint bolt and the protruding portion of the connector.

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