JPH047892Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) This invention relates to a water jet cutting nozzle.

(Prior art) Conventional water jet cutting nozzles include a pure water cutting nozzle that sprays pure water and an abrasive cutting nozzle that sprays abrasive-mixed water. It has a relatively simple structure with a high-pressure water nozzle tip attached to the tip of the main body, whereas a nozzle dedicated to abrasive cutting sprays high-pressure water mixed with abrasive grains (abrasive material). As shown in Figure 4, it has a relatively complex structure (Utility Model No. 60-36154).
(see publication). The structure of the nozzle dedicated to abrasive cutting will be briefly explained based on FIG. 4. In the figure, 51 is an adapter, and a nozzle main body 52 is screwed onto the tip of the adapter 51. A high-pressure water nozzle tip 53, a guide member 54, and an abrasive nozzle tip 55 are arranged in this nozzle body 52 in this order from the base end side. A shaft hole 56 is bored for guiding high pressure water ejected from the water nozzle tip 53 to the abrasive nozzle tip 55. The mixer outer cylinder 57 connects the high-pressure water nozzle tip 53, the guide member 54, and the abrasive nozzle tip 55 to the adapter 51 and the nozzle body 5.
This is for fixing to 2. On the other hand, the nozzle main body 52 and the mixer outer cylinder 57 include
An abrasive grain introduction passage 58 is bored, and the abrasive grains supplied from this introduction passage 58 are mixed into the high-pressure water from the outer peripheral portion of the guiding member 54 in the following manner. That is, the guide member 54 communicates with the shaft hole 56,
A mixing chamber 59 consisting of a longitudinal groove opening laterally and having a V-shaped cross section extending in the axial direction is provided, and abrasive grains are supplied to the shaft hole 56 via this mixing chamber 59. It is. Note that high-pressure water is supplied from a high-pressure water hose connected to the base end of the adapter 51.

(Problem to be solved by the invention) By the way, the dedicated nozzle for pure water cutting and the nozzle for abrasive cutting are used depending on the type of material to be cut. For example, when different types of materials are to be cut, When cutting alternately, the dedicated nozzle must be removed from the high-pressure water supply hose and replaced with another dedicated nozzle each time. Therefore, there is a problem in that the replacement work requires a lot of effort and time. Furthermore, since the conventional abrasive cutting nozzle has a structure in which the high pressure water nozzle tip 53 is covered with other members 52 and 57 as shown in FIG. The water jet jet direction of the high-pressure water nozzle tip 53 may be deviated parallel to the nozzle axis direction, or foreign matter such as dirt or rust may have entered between the high-pressure water nozzle tip 53 and the nozzle tip holding surface of the mixer outer cylinder 57, causing the water jet jet direction of the high-pressure water nozzle tip 53 to be parallel to the nozzle axis direction. Even if it was tilted, it would not be possible to know this, and as a result,
After assembly is completed, abrasive nozzle tip 5
There is a problem in that the high-pressure water passage 5 and the mixing chamber 59 may be unevenly worn.

This invention was made to solve the above-mentioned conventional drawbacks, and its purpose is to be able to perform cutting with pure water and cutting with abrasive-mixed water using a single waterjet cutting nozzle.
An object of the present invention is to provide a water jet cutting nozzle that can reduce the labor and time conventionally required for replacing dedicated nozzles, and can also prevent uneven wear of the high-pressure water passage of an abrasive nozzle tip. be.

(Means for Solving the Problem) Therefore, the water jet cutting nozzle of this invention includes a pure water nozzle section equipped with a high-pressure water nozzle tip that sprays high-pressure water, and abrasive grains mixed into the jetted high-pressure water. and an abrasive nozzle section for injecting high-pressure water from the high-pressure water nozzle chip. A high-pressure water passage arranged approximately coaxially and an abrasive grain supply hole communicating with the outer periphery of the abrasive nozzle tip and the high-pressure water passage are provided at a midway point in the axial direction of the high-pressure water passage. The abrasive nozzle is configured to supply abrasive grains from the outer periphery of the abrasive nozzle chip to the high-pressure water in the high-pressure water passage, and the abrasive nozzle section is configured to be detachable from the pure water nozzle section. It is said that

(Function) As described above, the water jet cutting nozzle is composed of a pure water nozzle section equipped with a high-pressure water nozzle tip and an abrasive nozzle section equipped with an abrasive nozzle tip. If it is detachable from the water nozzle part,
When cutting with pure water, remove the abrasive nozzle from the pure water nozzle.
Further, when cutting with abrasive-mixed water, by attaching an abrasive nozzle section to the pure water nozzle section, it is possible to perform cutting corresponding to each material to be cut. Therefore, it is possible to reduce the labor and time conventionally required for replacing dedicated nozzles. In addition, when attaching the abrasive nozzle to the pure water nozzle, high pressure water or low pressure water (pure water) must be injected from the high pressure water nozzle chip of the pure water nozzle so that the direction of the jet is aligned with the nozzle axis. Check that the direction matches the nozzle axis, and if it is deviated from the nozzle axis direction, correct it and then install the abrasive nozzle part. uneven wear can be easily prevented.

(Embodiments) Next, specific embodiments of the water jet cutting nozzle of this invention will be described in detail with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a water jet cutting nozzle, and this water jet cutting nozzle 1 has an adapter 4 and is a pure water nozzle connected to a high pressure water supply hose via this adapter 4. The abrasive nozzle part 3 is configured to be detachably attached to the pure water nozzle part 2. The pure water nozzle section 2 is
It is assembled from a high-pressure water nozzle tip 6 that comes into contact with the tip of the adapter 4 via an O-ring 5, and a bottomed cylindrical cap 7 for fixing the high-pressure water nozzle tip 6 to the adapter 4 side. A recess 8 for holding the high-pressure water nozzle tip 6 is formed in the bottom wall of the cap 7, and a high-pressure water introduction hole 10 corresponding to the nozzle hole 9 of the high-pressure water nozzle tip 6 is bored. . The inner peripheral surface of the cap 7 has a second screw groove 11 that is screwed into the first thread groove 11 formed on the outer peripheral surface of the tip end of the adapter 4.
A thread groove 12 is formed, and a third thread groove 13 for locking the abrasive nozzle portion 3 is formed on the outer peripheral surface. Furthermore, two relief holes 14 and 15 are bored inside the side wall of the cap 7 to guide water leaking from between the O-ring 5 and the high-pressure water nozzle tip 6 to the outside.
4 extends in the radial direction of the nozzle and communicates between the inner bottom of the cap and the outer circumference of the cap, and the other relief hole 15 extends in the axial direction of the nozzle and communicates between the middle part of the one relief hole 14 and the outer upper part of the cap 7. are doing. on the other hand,
The abrasive nozzle section 3 is connected to the cap 7.
An abrasive nozzle tip 17 is coaxially inserted into and abutted in a positioning recess 16 formed on the lower surface of the abrasive nozzle tip 17, and this abrasive nozzle tip 17 is supported via a ring-shaped spacer 18, and the above-mentioned cap and a bottomed cylindrical nozzle body 19 for clamping and fixing between the nozzle body 19 and the third nozzle body 19.
A fourth thread groove 20 is formed to be screwed into the thread groove 13. The abrasive nozzle chip 17 is
The distal end side is formed to have a smaller diameter than the proximal end side, and a seating step 21 is provided around the boundary portion.
Correspondingly, a through hole 22 for inserting the abrasive nozzle tip 17 is formed in the bottom wall of the nozzle body 19.
A receiving step portion 23 for supporting the seating step portion 21 is provided around the inside. The ring-shaped spacer 18 is interposed between the stepped portions 21 and 23. By the way, the above abrasive nozzle chip 17
is dimensioned so that when inserted into the through hole 22 of the nozzle body 19, the base end side protrudes from the bottom surface of the nozzle body. Therefore, the abrasive nozzle tip 17 is attached to the nozzle body 19 as shown in the figure.
When the abrasive nozzle tip 17 is clamped and fixed between the abrasive nozzle tip 17 and the cap 7, an annular sealed chamber, that is, an abrasive introduction chamber 24, is formed at the outer periphery of the proximal end of the abrasive nozzle tip 17. Then, in this introduction chamber 24, for example, the average particle size
20-70% alumina-based fine grain abrasive with a diameter of 100μm or less
A suspended abrasive liquid introduction passage 25 is formed in the side wall of the nozzle body 19 in a tangential direction to the introduction chamber 24 to introduce the contained suspended abrasive liquid. The abrasive nozzle tip 17 has a high-pressure water passage 26 in its axial center that communicates with the high-pressure water introduction hole 10, and the base of the high-pressure water passage 26 is a tapered hole whose diameter becomes smaller toward the tip. It is formed in 27. Further, in the nozzle chip body 28 of the abrasive nozzle chip 17, there are a plurality of suspended abrasive liquid supply holes (abrasive grain supply ports) 29 in the circumferential direction (as shown in the figure) that communicate the introduction chamber 24 and the tapered hole 27. 4 in case
) is bored diagonally downward at an angle of about 25° toward the axis, and as a result, the inside of the tapered hole 27 becomes a mixing chamber 30 for high-pressure water and suspended abrasive liquid. ing.

In the water jet cutting nozzle 1, when cutting with pure water is first performed, the abrasive nozzle part 3 is removed from the pure water nozzle part 2. In other words, the state shown in FIG. 1 is changed to the state shown in FIG. 3 by rotating the nozzle body 19 and unscrewing the third thread groove 13 and the fourth thread groove 20. It can be done easily. As a result, the present water jet cutting nozzle 1 can function as a dedicated nozzle for pure water cutting, and the high pressure water supplied from the high pressure water supply hose to the high pressure water nozzle chip 6 via the adapter 4 is transmitted through the nozzle hole of the high pressure water nozzle chip 6. 9 and is injected toward the material to be cut. on the other hand,
When cutting with abrasive-mixed water, the abrasive nozzle section 3 is attached to the pure water nozzle section 2. In other words, contrary to the above, the state shown in FIG. 3 is changed to the state shown in FIG. High-pressure water or low-pressure water is temporarily injected from a water nozzle tip 6, and it is checked whether the direction of the injection accurately matches the axial direction of the nozzle. Note that to ensure work stability, it is better to use low-pressure water. If the injection direction is deviated from the nozzle axis direction, the correction is made by retightening the cap 7, etc., and then the abrasive nozzle section 3 is attached to the pure water nozzle section 2. As a result, the high pressure water passage 26 of the abrasive nozzle tip 17 and the mixing chamber 3
This means that uneven wear of 0 can be easily prevented. By attaching the abrasive nozzle section 3 to the pure water nozzle section 2 as described above, the present water jet cutting nozzle 1 can function as a nozzle exclusively for abrasive cutting. In this case, from the suspended abrasive liquid introduction path 25 of the nozzle body 19 to the introduction chamber 24
The suspended abrasive liquid introduced into the annular introduction chamber 24
It enters each suspended abrasive liquid supply hole 29...29 of the abrasive nozzle tip 17 while rotating inside the abrasive nozzle chip 17,
The mixture is sucked into the mixing chamber 30 in a sufficiently stirred state. Then, the water is uniformly mixed around the high-pressure water flow flowing along the tapered hole 27. Therefore, uneven wear of the high-pressure water passage 26 and the mixing chamber 30 is prevented, and uniform abrasive-mixed water is sprayed from the abrasive nozzle tip 17 toward the workpiece.

As described above, in the water jet cutting nozzle 1, it is only necessary to attach and detach the abrasive nozzle portion 3 when performing cutting with pure water and cutting with abrasive-mixed water. Therefore, in the conventional case, when replacing a dedicated nozzle, at least two tasks are required: removing the dedicated nozzle from the high-pressure water supply hose, and connecting another dedicated nozzle to the high-pressure water supply hose. Although it was necessary, this water jet cutting nozzle 1
In this case, it is only necessary to perform either the work of attaching the abrasive nozzle part 3 to the pure water nozzle part 2 or the work of removing the abrasive nozzle part 3 from the pure water nozzle part 2. The effort and time required to replace nozzles can be reduced. Further, according to the above structure, it is possible to change the cutting method with a single touch, and therefore automation can be easily achieved.
Moreover, once the pure water nozzle part 2 is connected to the high-pressure water supply hose side, there is no need to remove it except in special cases such as during maintenance. It can extend the lifespan.

By the way, the above-mentioned water jet cutting nozzle 1
, unlike the conventional water jet cutting nozzle shown in FIG. 4, does not have an independent mixing chamber 59. Therefore, the number of parts is small and the whole is compact, but this is possible by not using abrasive grains but using a suspended abrasive solution containing a fine abrasive as described above. by. That is, when using a suspended abrasive liquid, the abrasive liquid can be sufficiently accelerated even if the acceleration distance is shorter than when using conventional abrasive particles. As a result of shortening the acceleration distance in this way, the jet attenuation within this section is reduced, so
The cutting ability will also be improved. In the above embodiments, the case where the pure water nozzle section 2 and the abrasive nozzle section 3 are attached and detached via the thread grooves 13 and 20 was explained as an example, but the attachment and detachment mechanism is limited to this. It is clear that other mechanisms such as a one-touch method can be applied instead. Alternatively, an independent mixing chamber may be formed on the abrasive nozzle portion 3 side and abrasive grains may be used as usual.
Abrasive grains may be used in the waterjet cutting nozzle 1 having the structure of the above embodiment. That is, the water jet cutting nozzle 1 of the above embodiment is suitable for adopting a suspension method in which suspended abrasive particles are mixed into high-pressure water, but it is suitable for adopting a dry method in which abrasive particles are mixed in high-pressure water. It can also be applied to cases where

(Effects of the invention) The water jet cutting nozzle of this invention consists entirely of a pure water nozzle section equipped with a high-pressure nozzle tip and an abrasive nozzle section equipped with an abrasive nozzle tip. The abrasive nozzle part is detachable from the pure water nozzle part, so when cutting with pure water, the abrasive nozzle part can be removed from the pure water nozzle part, and when cutting with water mixed with abrasive material, the abrasive nozzle part can be removed from the pure water nozzle part. By attaching an abrasive nozzle section to the pure water nozzle section, it is possible to perform cutting corresponding to each material to be cut. Therefore, it is possible to reduce the effort and time conventionally required to replace dedicated nozzles. Also, when attaching the abrasive nozzle to the pure water nozzle,
Since the high-pressure water nozzle tip can be installed after checking whether the high-pressure water jet direction is accurately aligned with the nozzle axial direction, uneven wear of the high-pressure water passage of the abrasive nozzle tip can be easily prevented. be able to.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of this invention,
Fig. 1 is a longitudinal sectional view of the water jet cutting nozzle, Fig. 2 is a - sectional view of Fig. 1, Fig. 3 is a longitudinal sectional view of the water jet cutting nozzle with the abrasive nozzle section removed, and Fig. 4 is a longitudinal sectional view of the water jet cutting nozzle. FIG. 2 is a longitudinal sectional view of a conventional waterjet cutting nozzle (a nozzle exclusively for abrasive cutting). 1... Water jet cutting nozzle, 2...
Pure water nozzle section, 3...Abrasive nozzle section, 6
... High pressure water nozzle chip, 17 ... Abrasive nozzle chip, 26 ... High pressure water passage, 29 ... Suspended abrasive liquid supply hole (abrasive grain supply hole).

Claims (1)

[Scope of utility model registration request] The abrasive nozzle has a pure water nozzle section equipped with a high-pressure water nozzle tip that injects high-pressure water, and an abrasive nozzle section that mixes abrasive grains into the injected high-pressure water and injects the mixture. is equipped with an abrasive nozzle chip, and the abrasive nozzle chip includes a high-pressure water passage disposed approximately coaxially with the high-pressure water injected from the high-pressure water nozzle chip;
An abrasive grain supply hole is provided at a midway point in the axial direction of the high-pressure water passage to communicate the outer periphery of the abrasive nozzle tip with the high-pressure water passage. 1. A water jet cutting nozzle, characterized in that the abrasive nozzle section is configured to supply abrasive grains to high-pressure water therein, and the abrasive nozzle section is configured to be detachable from the pure water nozzle section.