JPH0524453Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a technology for processing articles using a water jet mixed with abrasive particles such as sand, and particularly relates to a nozzle device used when carrying out the processing. This is related to the improvement of.

[Background Art] High-pressure water and abrasive particles (hereinafter referred to as abrasive) are mixed and sprayed. So-called abrasive jet processing can be efficiently applied to processing using relatively low pressure water, so it can be used for cutting concrete, reinforcing steel, etc.
It is applied to cutting steel frames and other items that are difficult to process using so-called water jet processing using only high-pressure water, and has been effectively put to practical use as a vibration-free and noise-free construction method, particularly in the construction field. The problem with this abrasive jet processing is how to uniformly mix high-pressure water jet and abrasive and how to spray it effectively from a nozzle. Attention has been paid to structure. Among these nozzle structures, an example of a nozzle that is considered to be simple and efficient is shown in FIG. That is, high-pressure water ejected from the orifice 104 of the high-pressure water nozzle 103 installed in the nozzle body 102 linearly passes through the mixing chamber 105 and exits from the orifice 107 of the mixing nozzle 106 installed at the tip of the nozzle body 102. released. Mixing chamber 1
05, a supply hole 109 of an abrasive pipe 108 disposed in the nozzle body 102 is open and filled with abrasive supplied from the abrasive pipe 108. When the high-pressure water ejected from the orifice 104 passes through the mixing chamber 105, the abrasive is drawn into the flow line of the high-pressure water, resulting in a mixed flow of high-pressure water and abrasive, which is ejected from the orifice 107.

As abrasive jet processing using such nozzle devices has been attracting attention,
There is a growing demand for its application in various fields. The above-mentioned nozzle device can be widely used for objects with a relatively flat shape, but when attempting to process a curved surface, such as the inner surface of a hole, from the inside, the nozzle device cannot be used unless the curvature is quite large. Difficult to apply inside curved surfaces. That is, the nozzle device cannot be inserted into the inner surface of the hole unless the hole has a fairly large diameter.

[Purpose] In view of the above-mentioned background art, the present invention proposes a nozzle device that is mainly applied when machining pipe members, holes, etc. from the inside.
In particular, we propose a nozzle device suitable for inserting the nozzle device into a small-diameter hole and processing from the inside of the hole.

[Structure] In order to achieve the above object, the present invention has the following structure. That is, a pipe member communicated with a high-pressure water generator via a rotary joint,
A cylindrical member disposed surrounding the tubular member, a nozzle head locked to one end of the cylindrical member, and a cylindrical member disposed at a predetermined position of the cylindrical member and the tubular member. a rotary joint in communication with and associated with a gap and a particulate material supply means, the nozzle head having a nozzle having a jet opening for injecting water in the axial direction of the tube member, and a nozzle located downstream of the nozzle. The nozzle includes a convergent nozzle, a mixing chamber formed and arranged between the convergent nozzles, and a deflection member detachably locked at a downstream position of the convergent nozzle. The mixing chamber communicates with the tubular member, and the mixing chamber communicates with a gap between the tubular member and the tubular member.

[Effect] Next, the effect will be described. High-pressure water is generally sent from a high-pressure water generating device, typically a pump, to a pipe member through a rotary joint, and is injected from an injection hole of a nozzle that communicates with the pipe member. On the other hand, abrasives, generally represented by sand, are sent from a granular material supply device that also serves as a storage tank for the abrasives through a rotary joint to the gap between a pipe member and a cylindrical member.
It is mixed with high-pressure water injected from a nozzle in a mixing chamber communicated with the gap. After the mixed flow of high-pressure water and abrasive is injected from the converging nozzle, it is guided by the deflection member in a direction that forms a predetermined angle with respect to the axis of the pipe member, and is injected toward the workpiece. It is something.

[Example] In the following, the present invention will be explained in more detail based on the illustrated example. FIG. 1 is a longitudinal sectional side view of a preferred embodiment of the nozzle device according to the present invention, and FIG. 2 is a view taken in the direction of arrow A in FIG.
FIG. 3 is a perspective view showing the deflection member taken out. FIG. 4 is a longitudinal sectional side view showing an example of a conventional nozzle device.

In the figure, reference numeral 1 denotes a pump, which is a high-pressure water generator, and is connected to a rotary joint 3 by a piping member 22. Reference numeral 2 denotes an abrasive supply device that also serves as a storage tank, and is connected to the rotary joint 4 by a piping member 21. Reference numeral 5 denotes a pipe member, which is connected to the pump 1 via a rotary joint 3. Reference numeral 6 denotes a cylindrical member, in which the pipe member 5 is housed, and a rotary joint 4 communicating with the abrasive supply device 2 is locked at an appropriate position. The rotary joint 4 allows the abrasive supply device 2 and the inside of the cylindrical member 6 to communicate with each other.

Reference numeral 7 denotes a nozzle head, which is secured to one end of the cylindrical member 6 and is joined to one end of the tube member 5 in an airtight manner. Reference numeral 8 denotes a nozzle having an injection hole 11 formed in the center thereof, which is embedded in the pipe member 5 and fixed to the pipe member 5 by coupling a threaded part 27 formed in the nozzle head 7 with a threaded part 14 formed in the pipe member 5. and communicates with the flow path 13. 9 is a converging nozzle with a projection hole 28 formed in the center, and the locking member 1
9 to the nozzle head 7. 1
0 is a mixing chamber, which is formed between the nozzle 8 and the converging nozzle 9, and through a communication hole 18 formed in the nozzle head 7 and a communication hole 17 formed between the nozzle head 7 and the cylindrical member 6. It communicates with a passage 12 formed in the gap between the tube member 5 and the cylindrical member 6. Reference numeral 23 designates a cap that is secured to the other end of the cylindrical member 6, and 24 and 25 designate bearings that are disposed at predetermined positions on the cylindrical member 6. Reference numeral 26 denotes an extending member provided on the rotary joint 3 to rotate integrally with the pipe member 5. Reference numeral 15 denotes a deflection member, which is fixed to the tip of the locking member 19 and has a deflection groove 16 carved at a position where it engages with the projection hole 28 of the converging nozzle 9.

In the nozzle device with such a configuration, high-pressure water generated by the pump 1 is sent to the rotary joint 3 through the piping member 22, further passes through the flow path 13 of the piping member 5, and is injected from the injection hole 11 of the nozzle 8. . On the other hand, the abrasive stored in the abrasive supply device 2 is sent to the rotary joint 4 through the piping member 21, and further passes through the passage 12 formed in the gap between the pipe member 5 and the cylindrical member 6 to the communication portion 17 and the communication hole 18. and is supplied to the mixing chamber 10. The high pressure water injected from the injection hole 11 of the nozzle 8 and the abrasive supplied to the mixing chamber 10 become a mixed flow of water and abrasive in the mixing chamber 10, and
Projected from 8. The principle structure in which the high-pressure water injected from the nozzle 8 and the abrasive in the mixing chamber 10 are mixed and projected from the converging nozzle 9 is as follows.
This is similar to the conventional nozzle device shown in the figure. That is, when the high-pressure water injected from the injection hole 11 of the nozzle 8 passes through the mixing chamber 10, it involves the abrasive in the mixing chamber 10 in a streamline to form a mixed flow, which advances toward the convergent nozzle 9. High pressure water is in mixing chamber 10
Immediately after exiting the injection hole 11, it gradually diffuses as it encounters air resistance and abrasive resistance as it travels through the interior. Therefore, this diffused mixed flow is adjusted again into a desired streamline by the converging nozzle 9 and projected from the projection hole 28. At this time, when the high-speed streamline injected from the injection hole 11 passes through the projection hole 28 of the convergence nozzle 9, it is possible to obtain a so-called ejector effect in which the air in the mixing chamber 10 is carried away with it.
The abrasive supply device 2 can be used as a self-priming type without taking any special measures. Of course, in order to stably supply the abrasive, a method may also be used in which a pressurizing means is added to the abrasive supply device 2 to forcibly feed the abrasive to the mixing chamber 10. In this way, the flow direction of the mixed flow of high-pressure water and abrasive projected from the projection hole 28 of the converging nozzle 9 is changed along the deflection groove 16 formed in the deflection member 15, and the workpiece 20 is processed in a desired direction. The water is sprayed toward the inner surface of the hole 29.

Now, when the extending member 26 of the rotary joint 3 is driven to rotate as appropriate, the pipe member 5 rotates integrally with the extending member 26. The tube member 5 is screwed to the cap 23, and the cap 23 is further screwed and fixed to the cylindrical member 6, so that when the tube member 5 rotates, the cylindrical member 6 also rotates integrally with the tube member 5. on the other hand,
The nozzle head 7 is locked to the tubular member 5 by both threaded portions 14 and 27, and is also fitted and locked to the tubular member 6, so that the rotation of the tubular member 5 causes the nozzle head 7 to rotate in the same manner as the tubular member 6. The deflection member 15 is rotated integrally with the tube member 5, thereby rotationally driving the deflection member 15. That is, by rotationally driving the extending member 26, the ejection direction of the deflecting groove 16 of the deflecting member 15 can be rotated via the nozzle head 7. In this way, when the nozzle head 7 is rotated, the machined hole 29
A mixed flow of high-pressure water and abrasive can be applied to the entire inner peripheral surface of the pump.

In this embodiment, the deflection groove 16 of the deflection member 15
is released by being deflected in a radial direction of 90 degrees with respect to the axis of the tube member 5, but it can be obtained by deflecting it at an appropriate angle as necessary.

[Effects] As detailed above, the present invention includes a pipe member that communicates with a high-pressure water generator via a rotary joint, a cylindrical member disposed surrounding the pipe member, and a pipe member that is arranged to surround the pipe member. It consists of a nozzle head locked at one end, and a rotary joint disposed at a predetermined position of the cylindrical member to communicate and associate the gap between the cylindrical member and the pipe member with the granular material supply means, The nozzle head is formed and arranged between a nozzle having an injection port opening to inject water in the axial direction of the tube member, a convergent nozzle disposed downstream of the nozzle, and the nozzle and the convergent nozzle. It is comprised of a mixing chamber and a deflection member detachably locked at a position downstream of the converging nozzle, the nozzle communicating with the tube member, and the mixing chamber being connected to the gap between the tubular member and the tube member. This allows a mixed flow of high-pressure water and abrasive to be applied to the entire circumference of the inner surface of a hole with a relatively small diameter, making it possible to process the inner surface of the hole extremely effectively. It is. Furthermore, the same effect can be obtained not only in circular holes but also in flat narrow gaps, and by adding rotational drive and axial movement, the machining range can be expanded.
It can be used extremely effectively.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional side view of a preferred embodiment of the nozzle device according to the present invention, FIG. 2 is a view taken in the direction of arrow A in FIG. 1, and FIG. 3 is a perspective view showing the deflection member taken out. It is a diagram. FIG. 4 is a longitudinal sectional side view showing an example of a conventional nozzle device. 1... pump, 2... abrasive supply device,
3... Rotating joint, 4... Rotating joint, 5... Pipe member, 6... Cylindrical member, 7... Nozzle head, 8...
... Nozzle, 9 ... Convergence nozzle, 10 ... Mixing chamber,
11... Injection hole, 12... Passage, 13... Channel,
14... Threaded portion, 15... Deflection member, 16... Deflection groove, 17... Communication portion, 18... Through hole, 19...
Locking member, 20... Workpiece, 21... Piping member, 22... Piping member, 23... Cap, 24
... Bearing, 25 ... Bearing, 26 ... Extension member, 27 ... Threaded part, 28 ... Projection hole, 29 ...
Machining hole, 102... Nozzle body, 103... High pressure water nozzle, 104... Orifice, 105...
Mixing chamber, 106... Mixing nozzle, 107... Orifice, 108... Abrasive pipe, 109
...Supply hole.

Claims (1)

[Scope of utility model registration request] A pipe member communicated with a high-pressure water generator via a rotary joint, a cylindrical member disposed surrounding the pipe member, a nozzle head secured to one end of the cylindrical member, The rotary joint is disposed at a predetermined position and communicates and associates a gap between the cylindrical member and the tube member with a granular material supply means, and the nozzle head injects water in the axial direction of the tube member. a nozzle having an injection port that is as open as possible, a convergent nozzle disposed downstream of the nozzle, a mixing chamber formed and arranged between the nozzle and the convergent nozzle, and detachable at the downstream position of the convergent nozzle. an abrasive fluid jet comprising: a deflection member secured to the tube member; the nozzle communicates with the tube member; and the mixing chamber communicates with a gap between the tube member and the tube member. nozzle device.