JPH0344265Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a nozzle holding structure, and more specifically, it is used for machining processes such as cutting and cutting workpieces by jetting fluid at ultra-high pressure. The present invention relates to a nozzle holding structure suitably used in a high-pressure injection nozzle that performs.

[Prior Art] Conventionally, nozzle holding structures in waterjet processing equipment, etc., which process workpieces by injecting ultra-high pressure fluid from a nozzle, have been designed to prevent the nozzle body from being damaged or falling off due to fluid pressure. In order to prevent danger and to prevent fluid leakage, the structure has tended to become more complex and larger.

Therefore, not only is it complicated to replace the nozzle body, but it is also inevitably impossible to perform various types of processing in the injection direction (depth direction) on a workpiece that is smaller than the nozzle holding structure. It was necessary to make it as small as possible.

As a result of repeated improvements and prototypes, the inventors focused on shape memory alloys, which have recently been used in piping systems for military aircraft, etc., and created a nozzle body with a lance made of this shape memory alloy. It has been found that by holding the nozzle, it is possible to obtain a holding structure that has a simple structure, allows easy exchange of the nozzle body, and can reduce the size of the nozzle holding part as much as possible.

[Purpose of the invention] The object of the invention is to provide a nozzle holding structure that has a simple structure, allows for easy replacement of the nozzle body, and allows the size of the holding part to be made as small as possible. purpose.

[Structure of the invention] The nozzle holding structure according to the invention is characterized in that the end portion of the lance that holds the approximately truncated conical nozzle body is formed of a shape memory alloy that has been memorized in advance to the shape of the nozzle body. do.

In this case, the outside of the lance end is configured to be tightened with a ring member made of a shape memory alloy formed separately, and a groove is formed along the outer periphery of the lance end, and the ring member is fitted into this groove. If this structure is adopted, the holding structure can be made more solid, which is preferable.

[Embodiments] Next, preferred embodiments of the nozzle holding structure according to the present invention will be described in detail with reference to the accompanying drawings.

1 and 2, the nozzle holding structure according to the present invention holds a truncated cone-shaped nozzle body 2 with a fluid injection hole 1 of a predetermined diameter inside the tip 4 of a lance 3, and It is constructed by fitting a ring member 6 into a groove 5 formed along the outer periphery of the tip 4 and tightening the ring member 6. In this case, the tip 4 of the lance 3 is made of, for example, Ti-Ni.
It is made of a shape memory alloy made from a base alloy.
That is, the tip 4 made of shape memory alloy maintains the inversely tapered expanded state as shown in FIG. 3 below a predetermined transition temperature, but when heated above the transition temperature, it expands as shown in FIG. As shown, the nozzle body 2 is deformed into the same shape as the pre-stored external shape of the nozzle body 2 and maintains this shape.
is configured to hold. In this case, it is more preferable to form a stepped seat portion at a predetermined location inside the tip portion 4 to receive the rear end portion of the nozzle body 2. Further, the ring member 6 is also formed of the same shape memory alloy as the lance tip 4,
Below a predetermined transition temperature, the diameter remains slightly larger than the diameter of the groove 5, but when heated above the transition temperature, the diameter changes to approximately the same diameter as the previously stored diameter of the groove 5, as shown in FIG. It is configured to deform and maintain its shape and to tighten the tip 4.

In the nozzle holding structure according to the present invention configured as described above, when attaching the nozzle body to the lance, first, the tip 4 of the lance 3 is cooled to below the transition temperature and the tip 4 is expanded. After that, the nozzle body 2 is supported at a predetermined position inside the tip 4 and heated to a temperature higher than the transition temperature.
The nozzle body 2 is held by deforming into the memorized state, and then the ring member 6, which has also been cooled to below the transition temperature, is fitted into the groove 5 formed on the outer periphery of the tip 4, and the transition is performed in the same manner as above. The tip 4 of the lance 3 is tightened by the ring member 6 which has been heated above the temperature and transformed into a memorized state. Incidentally, when replacing the nozzle main body 2, it can be easily done by cooling the end of the lance 3 below the transition temperature and expanding and deforming the ring member 6 and the tip 4.

[Effects of the invention] As mentioned above, according to the nozzle holding structure according to the invention, the nozzle body is tightly held using the lance tip and ring member formed of a shape memory alloy, so it is small and compact. Not only is it lightweight, but since the diameter of the lance is the maximum diameter of the nozzle holding part, it is extremely easy to perform cutting and drilling operations by jetting high-pressure fluid as long as the diameter of the lance is sufficient. It has various advantages such as the ability to easily replace the main body, and its practical effects are extremely large.

Although the preferred embodiment of the nozzle holding structure according to the present invention has been described above, the present invention is not limited to this embodiment. It is also possible to adopt a structure in which the above is omitted, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional explanatory view showing a preferred embodiment of the nozzle holding structure according to the present invention, FIG. 2 is a perspective view of the holding structure shown in FIG. 1, and FIG. 3 is a holding structure shown in FIG. 1. FIG. 3 is a cross-sectional view showing a state where the tip of the lance is below the transition temperature in FIG. 2: Nozzle body, 3: Lance, 4: Shape memory alloy tip, 5: Groove, 6: Shape memory alloy ring member.

Claims (1)

[Claims for Utility Model Registration] (1) Holding of a nozzle characterized in that the end of the lance that holds the generally truncated cone-shaped nozzle body is made of a shape memory alloy that has been memorized in the shape of the nozzle body in advance. structure. (2) The nozzle holding structure according to claim 1, which comprises tightening the outer side of the lance end with a separately formed ring member made of a shape memory alloy. (3) Forming a groove along the outer periphery of the lance end;
The nozzle holding structure according to claim 2, which comprises a ring member fitted into the groove.