JPH03111172A - Cutting jig for abrasive water jet - Google Patents

Abstract

PURPOSE:To uniformly mix abrasive into a high pressure water, to eliminate the uneven wear of a mixing chamber, nozzle, etc., and to prolong the exchange life of a cutting jig, by communicating plural passages which feed abrasive with a mixing chamber. CONSTITUTION:A water supply becomes a high pressure water via an orifice 36 when it started from a water supply pipe 70 and this high pressure water is faced to a nozzle 40 with its linear propagation of a mixing chamber 35. In the case of the high pressure water passing through this mixing chamber 35 at high speed, a negative pressure is generated inside a guide pass 34. This negative pressure reaches the dispersion chamber 51 communicated with the guide pass 34 and a store chamber 50. As a result, the abrasive inside the store chamber 50 falls into the dispersion chamber 51 via a recessed groove 33. Consequently, the abrasive is transferred in a lump, this grain lump is crushed when passing through the projection bodies 32 of the dispersion chamber 51 inside and yet the crushed abrasive is uniformly dispersed in all directions by plural recessed grooves 33.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an abrasive water jet cutting technology for cutting concrete structures, steel plates, etc. using the impact energy of high-pressure water mixed with abrasives. Specifically, the present invention relates to an abrasive water jet cutting jig that improves the dispersibility of an abrasive mixed in high-pressure water.

<Conventional technology> FIG. 3 shows a conventional cutting jig.

a is a high-pressure water passage, b is an orifice provided at the end of high-pressure water passage a, C is an abrasive passage that supplies abrasive material, d is a mixing chamber formed at the meeting point of both roads A and C, e is a mixing chamber This is a nozzle that communicates with d.

The orifice b, the mixing chamber d, and the nozzle e are located on the same straight line.

The abrasive material is drawn into the mixing chamber d using the negative pressure generated when the high-pressure water that has passed through the orifice b passes through the mixing chamber d, mixes it with the high-pressure water, and injects it from the nozzle e. There is.

<Problems to be Solved by the Present Invention> The conventional abrasive water jet cutting technology described above has the following problems.

<A> Since the abrasive passage C communicates with only one side of the mixing chamber d, the abrasive is not evenly dispersed within the mixing chamber d and tends to be introduced in the form of lumps.

Therefore, as shown by the broken line in the figure, the side surface of the mixing chamber d and the inlet of the nozzle e are unevenly worn, so the replacement life of the jig is relatively short.

<Exposure> If the abrasive is not evenly dispersed within the mixing chamber d, the density of the abrasive in the high-pressure water sprayed from the nozzle e will vary, resulting in a decrease in cutting efficiency.

<Object of the present invention> The present invention was made to solve the above problems, and its purpose is to extend the life of the jig and improve cutting efficiency by improving the dispersibility of the abrasive. It is an object of the present invention to provide a cutting jig for abrasive water jetting and cutting that can improve the performance of the abrasive water sieve.

<Means for solving the problem> That is, the present invention consists of an outer cylinder with a sealed structure, an inner plug housed in the outer cylinder, and a nozzle connected to the lower part of the inner plug, and a part of the outer cylinder is polished. A supply pipe for abrasive material is connected to form a passage for distributing and dropping the abrasive material between the circumferential surfaces of the outer cylinder and inner plug, and a water supply pipe is connected to the center of the inner plug by penetrating the outer cylinder. A mixing chamber is formed between the water pipe and the nozzle via an orifice, and a plurality of communicating passages are provided between the mixing chamber and the passage.
This is a cutting jig for Sosive Water Ciet.

<Description of the present invention> The present invention will be described below with reference to the drawings.

<A> Cutting jig FIG. 1.2 shows a cutting jig 10 of the present invention.

The cutting jig 10 includes an outer cylinder 20 having a sealed structure, an inner plug 30 housed in the outer cylinder 20, and a nozzle 40 connected to the inner plug 30.

The inner plug 30 has a screw hole 31 in the center, and has gear-shaped protrusions 32 protruding in multiple stages on its outer peripheral surface, and a vertical groove 33 between adjacent protrusions 32. is formed.

Since the grooves 33 are passages for evenly dispersing and dropping the abrasive material, it is preferable that the grooves 33 are staggered so that they are not located consecutively in the vertical direction.

Furthermore, a small-diameter injection passage 37 is formed in the lower part of the inner plug 30 so as to communicate with the center of the bottom surface of the screw hole 31, and an introduction passage 34 is further opened to intersect with the small-diameter injection passage 37 at an appropriate angle. It is.

Inside the outer cylinder 20, an annular storage chamber 50 is formed between the upper parts of the uppermost projections 32, and a dispersion chamber 51 is formed below the storage chamber 50.

The lowest part of the dispersion chamber 51 communicates with the introduction path 34 .

A space where the small diameter injection path 37 and the introduction path 34 intersect becomes a mixing chamber 35 .

Therefore, the introduction path 34 is between the mixing chamber 35 and the dispersion chamber 517.
It will be connected to as many locations as there are openings.

60 is an abrasive supply pipe connected to the storage chamber 50.

A water pipe 70 passes through the outer cylinder 20 and is screwed into the large diameter portion of the screw hole 31 of the inner plug 30.

The orifice 36 is sandwiched between the water pipe 70 and the inner plug 30.

The nozzle 40 is connected to the center of the lower part of the inner stopper 30 so as to communicate with the mixing chamber 35.

Water pipe 70, orifice 36, mixing chamber 35 and nozzle 4
0 are arranged so that each center is located on a straight line.

<Operation> When water starts to be fed from the water pipe 70, high pressure water passes through the orifice 36, and this high pressure water travels straight through the mixing chamber 35 and heads toward the nozzle 40.

When high pressure water passes through the mixing chamber 35 at high speed, the introduction path 34
It creates negative pressure inside.

This negative pressure extends to the dispersion chamber 51 and the storage chamber 50, which communicate with the introduction path 34.

As a result, the abrasive material in the storage chamber 50 falls into the dispersion chamber 51 through the groove 33.

Even if the abrasive material is transported in the form of a lump, the abrasive material is crushed when it passes between the projections 32 in the dispersion chamber 51, and the crushed abrasive material is evenly distributed in all directions by the plurality of grooves 33. Ru.

The abrasive material that has fallen to the bottom of the dispersion chamber 5 flows through multiple introduction channels 3.
4 into the mixing chamber 35 under negative pressure, mixed evenly with high-pressure water, and ejected from the nozzle 40.

<Other Modifications> The groove 32 shown in FIG. 1.2 may be formed at an appropriate angle to form a spiral passage, and the abrasive material in the storage chamber 50 may be dropped using this passage. .

<Effects of the Present Invention> Since the present invention is as described above, the following effects can be obtained.

<A> Conventionally, the passage for supplying the abrasive material communicates with only one side of the mixing chamber.

In contrast, in the present invention, since a plurality of passages for supplying the abrasive are communicated with the mixing chamber, the abrasive can be evenly mixed into the high-pressure water.

Therefore, uneven wear of the mixing chamber, nozzle, etc. as in the conventional case is eliminated, and the replacement life of the cutting jig is extended.

<Mouth> Since the abrasive is not directly supplied to the mixing chamber, but is allowed to fall between the grooves formed between the protrusions, the abrasive does not form into a lump and be sucked into the mixing chamber.

〈C〉 Since there is no variation in the density of the abrasive material in high-pressure water,
Improves cutting efficiency.

[Brief explanation of drawings]

Fig. 1.2 Overall perspective view of the cutting jig according to the present invention. Fig. 2. Vertical sectional view thereof. Fig. 3: Explanatory diagram of the prior art.

Claims (1)

[Claims] (1) Consists of an outer cylinder with a sealed structure, an inner plug housed in the outer cylinder, and a nozzle connected to the bottom of the inner plug. An abrasive supply pipe is connected to a part of the outer cylinder, and the outer cylinder and A passage is formed between the inner plug and the peripheral surface for the abrasive to disperse and fall, and a water pipe is connected to the center of the inner plug by passing through the outer cylinder, and an orifice is connected between the water pipe and the nozzle. An abrasive water jet cutting jig, comprising: a mixing chamber; and a plurality of communicating passages between the mixing chamber and the passage.