JPH0781660B2 - Ultra-high pressure fluid hose separation prevention mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a detachment prevention mechanism provided to prevent detachment of an ultra-high pressure fluid hose.

[Conventional technology]

Ultra high pressure water jetting from a nozzle (35
Recently, various treatments have been performed using a fluid (for example, water) which has a pressure of 0 kgf / cm ² or more and is the same hereinafter. For example, there are treatments such as cutting concrete and rebar, and treatments such as removing old paint on the hull outer skin (which was conventionally performed by sandblasting). A flexible hose is used to guide the ultra-high pressure water from the device for generating the ultra-high pressure water to the nozzle. This hose for ultra-high pressure water has a reinforcing material such as wires and fibers embedded in layers between the resin outer skin and the inner skin so that it can withstand ultra-high pressure as a whole (for example, special features). (Kaisho 59-118434). However, it is conceivable that even such a hose for ultra-high pressure water may be broken due to fatigue after being used for a long time. This break often occurs at the point where the hose and metal come into direct contact. Such a portion exists at a connection portion between hoses and a hose or a connection portion between a hose and a device. That is, at these connecting portions, the hose and the fittings used for the connection come into direct contact with each other.

[Problems to be solved by the invention]

If the ultra-high pressure water hose is disengaged due to the above destruction, the end of the hose may move violently or the disengaged fitting may fly with the hose attached. And this problem also exists in the hose that guides the hydraulic oil used in hydraulic equipment.

[Means for solving problems]

The present invention is to provide an anchor on both the hose and the hose or both the hose and the device at a position where the connection between the hose and the hose or the connection between the hose and the device is sandwiched, and to connect both anchors with a connecting agent. . The anchor provided on the side of the hose is a sleeve that directly contacts the hose,
It is composed of a body fitting that holds this sleeve, and a union fitting that is screwed into the body fitting to press the sleeve. The sleeve has a friction surface on the side that contacts the outer peripheral surface of the hose and a tapered surface on the outside, and expands and contracts in the radial direction when the tapered surface is pressed. The body fitting holds the sleeve from the outside, and has a tapered surface corresponding to the tapered surface of the sleeve at the holding portion.

[Action]

Even if the hose is disconnected at the connecting portion, anchors are provided on both connecting portions and they are connected by a connecting member, so that there is no danger of the hose moving violently or the cap flying with the hose attached.

By the action of the sleeve that constitutes the anchor, the anchor is strongly tightened to the hose by utilizing the strong pulling force when the hose is detached. When the hose is normally used, this strong tightening force does not occur, so that fatigue can be prevented from occurring between the anchor and the hose.

〔Example〕

A first embodiment of the present invention will be described with reference to FIGS. The separation prevention mechanism of the present embodiment is provided at the connecting portion between the hoses 1 and 1. These connections are for both hoses 1,
1 is composed of mouth fittings 2, 2 that are crimped and fixed, and an adapter 3 that connects both mouth fittings. Anchors 4, 4 are provided on both hoses at a position sandwiching this connecting portion. Both anchors 4 are connected by a connecting member 5 made of a chain. The center of the connecting member 5 is connected by a joint screw 6.

Next, the internal structure of the anchor 4 is shown in FIG. Anchor 4
Is composed of a sleeve 7, a body fitting 8 and a union fitting 9. The sleeve 7 is a fitting that directly contacts the outer peripheral surface of the hose 1, and has a friction surface 10 on the contact side. The friction surface 10 is formed by a thread groove. Sleeve 7
There is a tapered surface 11 on the outer side of. The sleeve is divided into two pieces in the circumferential direction so that the inner diameter of the entire sleeve can be changed. The divided sleeve is held by the body fitting 8 from the outside.

The body metal fitting 8 is a nut-shaped metal fitting and has a tapered surface 12 at a holding portion for holding the sleeve. The tapered surface 12 corresponds to the tapered surface 11 of the sleeve 7. The union metal fitting 9 having the threaded portion 14 screwed into the threaded portion 13 provided on the outer circumference of the body fitting 8 on the inner circumference is the sleeve 7.
Is pressed in the axial direction of the hose. By adjusting the screwed state, the pressing force can be adjusted and the frictional force between the sleeve 7 and the hose 10 can be adjusted arbitrarily.

Next, the operation of this embodiment will be described. When the hose 1 is normally used, it is preferable that the friction surface 10 formed of the thread groove of the sleeve 7 bite into the hose 1 to be small. This is because if it is too large, fatigue occurs between the hose 1 and the sleeve 7 whose outer diameter changes due to increase / decrease in water pressure, and the reliability of this embodiment as a safety device is lacking. However, if the hose is too small, the initial biting force for the sleeve 7 to bite into the hose when the hose is disengaged is insufficient, and the anchor 4 as a whole slips with respect to the hose 1. In order to eliminate this inconvenience, the screwing state of the union fitting 9 with respect to the body fitting 8 is adjusted to generate an appropriate initial biting force. This initial biting force is also necessary to prevent the anchor from moving with respect to the hose during normal use.

Next, the adjustment of the initial biting force will be described based on the following table. From the conclusion, the thread groove depth d of the sleeve 7 is set to 1/3 to 1 times the outer thickness of the hose (already described), and the initial biting amount is 1/5 to the thread groove depth d. It is desirable that one time bite into the hose jacket.

This table shows the results of three experiments. In the experiment, the thread groove depth of the sleeve was 1/3, 1/2, with respect to the outer thickness of the hose.
In each experiment, the biting amount of the sleeve thread groove was set to 1/5, 1/4, 1/3, 1/2, 1/1 of the thread groove depth d in each experiment.

In order that the anchor does not slip on the hose 1 and the displacement does not occur, the initial biting depth needs to be 1/6 or more of the outer cover thickness.

(Other Embodiments) In the above embodiments, the detachment prevention mechanism at the connection portion between the hose and the hose has been described, but in another embodiment, the detachment prevention mechanism at the connection portion between the hose and the device may be provided. . Further, not only chains but also wires, cylindrical members, etc. can be considered as the connecting material.

First, FIG. 3 shows that a disconnection preventing mechanism is provided at the connecting portion between the pump device 15 and the hose. Figure 4 shows a hose and hose 1
A cylindrical member is used as the connecting member 5, although it is provided at the connecting portion with. FIG. 5 shows a cylindrical member similar to that of FIG. 4 provided at the connecting portion between the hose and the device 15.

In the above-mentioned embodiments, the union fitting 9 merely functions to press the sleeve 7, but in other embodiments it may serve as the body fitting 8 as shown in FIG. That is, in FIG. 6, the sleeve 7 has tapered surfaces on both sides in the axial direction, and the tapered surface 12 corresponding to one tapered surface 11 is provided with the body fitting 8.
The taper surface 22 corresponding to the other taper surface 21 has the union fitting 9
It is provided in. According to this embodiment, the anchor is fastened to the hose regardless of the direction in which the tensile force is applied. Therefore, when attaching the detachment preventing mechanism to the hose, it is possible to prevent the attaching direction from being mistaken.

In the above embodiment, the sleeve 7 was divided in the circumferential direction as shown in FIG. 7, but in other embodiments, as shown in FIG. It is also possible to form a so-called "slit" shape by partially slitting. As a result, the portion having the slit can be elastically bent and expanded in the radial direction.

Further, the sleeve can be formed as an integral body of a material having a retroactive property (for example, brass, aluminum or resin such as nylon or polyester) without being divided or slit, and can be expanded / contracted in the radial direction by elasticity. .

〔The invention's effect〕

According to the ultra-high pressure fluid hose disconnection prevention mechanism of the present invention, even when the hose is disconnected from the connection part, it is possible to prevent the risk of the hose end moving violently and the mouth fitting of the connection part flying with the hose attached. Also, since the anchor is fastened to the hose only when the hose is detached due to the function of the sleeve, it can be lightly fastened to the hose by the function of the union fitting during normal use, so it is possible to prevent fatigue damage and the like. It does not lose its function as a safety mechanism.

[Brief description of drawings]

1 is an overall schematic view showing an embodiment of the present invention, FIG. 2 is a sectional view of the anchor of FIG. 1, and FIGS. 3 to 5 are schematic overall views showing other embodiments of the present invention. FIG. 6 is a longitudinal sectional view of an anchor according to another embodiment, and FIGS. 7 and 8 are perspective views of a sleeve existing inside the anchor. 1 ... Hose, 2 ... Mouthpiece, 3 ... Abaptor, 4 ... Anchor, 5 ... Connecting material, 6 ... Joint screw, 7 ... Sleeve,
8 ... Body metal fittings, 9 ... Union metal fittings, 10 ... Friction surface, 11,1
2 ... tapered surface, 13,14 ... threaded part, 15 ... device, 12,22 ... tapered surface.

Claims (1)

[Claims] 1. In a hose connecting an apparatus for generating an ultrahigh pressure fluid to another apparatus or a nozzle for ejecting an ultrahigh pressure fluid, a connection portion between the hose and the connection portion between the hose and the apparatus is sandwiched. At the position, anchors are provided on both the hose and the hose or both the hose and the device, and both anchors are connected by a connecting material.The anchor provided on the hose has a friction surface on the side that contacts the outer peripheral surface of the hose and a taper surface on the outside. A sleeve that expands and contracts in the radial direction when the tapered surface is pressed, a body fitting that holds the sleeve from the outside and has a tapered surface corresponding to the tapered surface at the holding portion, and a screw on the body fitting. And a union fitting for pressing the sleeve to generate frictional force.