JP2001121424A - Wet type blast injection nozzle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new wet type blast injection nozzle capable of bringing uniform processing effect by uniformly dispersing abrasive material in slurry. SOLUTION: This blast injection nozzle has a nozzle body 1 which has a slurry chamber 8 formed longitudinally and small-diameter slurry inflow ports 9, 10 formed laterally staggered in relation to the longitudinal axis so as to form a swirling flow of slurry; a flat nozzle body 2 which has a narrow rectangular injection nozzle 20 parallel with the slurry chamber 8 and a tapered introduction part 21 formed at the top end, and is attached to the lower part of the nozzle body 1 so as to communicate with the slurry chamber 8; and an air nozzle body 4 which has an air nozzle line at the tip, where small-diameter air nozzles 30 for injecting high-pressure air are arranged in line, and an air intake groove 32 and introduces high-pressure air through the sides of the air intake groove 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spray nozzle for wet blast, and more particularly to a spray nozzle for wet blast which sprays a slurry in a narrow straight line toward the surface of a workpiece.

[0002]

2. Description of the Related Art Wet blasting, in which a slurry is sprayed toward the surface of a workpiece, is widely used for deburring various printed circuit boards, surface processing of metal parts, and the like. Wet blasting, which sprays water, is widely used depending on the application as a material capable of efficiently processing a planar workpiece.

In order to inject a slurry in a narrow straight line, a dedicated injection nozzle is required.
No. 050, Japanese Patent Application Laid-Open No. 9-13192, etc., this type of injection nozzle is proposed. Further, the applicant of the present application has already proposed an injection nozzle for injecting a slurry in a narrow straight line as Japanese Utility Model Publication No. 2-5899 and Japanese Patent Publication No. 4-60789.

[0004]

In these wet blasts, usually, an abrasive material having extremely high abrasion is used. Therefore, unless sufficient measures are taken against the abrasion, the nozzle will be worn out in a short time, and as a nozzle, You will no longer use it. Therefore, most of the conventional inventions relating to the spray nozzle for wet blast have been mainly concerned with this measure against wear. On the other hand, in an injection nozzle that injects a slurry in a narrow straight line, if the slurry is not uniformly dispersed in water and mixed well, processing unevenness is likely to occur,
Although a uniform processing effect cannot be obtained, the realization of the uniform processing effect was technically very difficult, and no satisfactory injection nozzle was found.

[0005] This is because, in an injection nozzle for injecting a slurry in a narrow straight line, a slurry chamber for temporarily storing the slurry has a horizontally long shape, so that the abrasive material dispersed in the slurry is inevitable. Is stagnation or unevenly distributed at a specific location in the slurry chamber, and is difficult to uniformly disperse in water.

The inventor of the present invention has conducted research to solve the above-mentioned problems concerning the injection nozzle for injecting the slurry in a narrow linear shape. As a result, the abrasive is always uniformly dispersed and well mixed in the slurry. The present invention has succeeded in developing a novel spray nozzle for wet blast, which can obtain a uniform processing effect when sprayed onto a workpiece, and proposes the present invention as the present invention.

[0007]

According to the present invention, a cylindrical slurry chamber 8 having both ends closed by closed walls 6 and 7 is formed in the longitudinal direction, and the slurry of the closed walls 6 and 7 is formed. The small-diameter slurry inflow holes 9 and 10 are provided at positions offset from each other in the left and right directions with respect to the longitudinal axis of the chamber, and the slurry is supplied from the slurry inflow holes 9 and 10 into the slurry chamber 8. A nozzle main body 1 in which a rotating flow of the slurry is formed in the slurry chamber 8 when introduced into the slurry chamber 8; and an elongated rectangular injection nozzle 20 parallel to the slurry chamber 8; A tapered introduction portion 21 is formed at the upper end of the injection nozzle 20,
A flat nozzle body 2 attached below the nozzle body 1 so that the introduction portion 21 communicates with the slurry chamber 8;
The tip is located above the introduction part 21 of the flat nozzle main body 2, and the tip is provided with an air-nozzle row 31 in which small-diameter air-nozzles 30 for injecting high-pressure air are arranged in a row. An air intake groove 32 is provided in parallel with the slurry chamber 8, and the air intake groove 32 is provided.
Air-intake holes 33 and 33 'communicate with both ends of
The above problem is not solved by forming a wet blast nozzle by the air nozzle body 4 for introducing high-pressure air from both sides of the air intake groove 32.

[0008]

FIG. 1 is a front sectional view of an embodiment of an injection nozzle for wet blast according to the present invention, FIG. 2 is a transverse sectional view taken along the line AA in FIG. 1, and FIG. 1 is a vertical sectional view taken along line BB of FIG. 1, and FIG. 4 is a vertical sectional view taken along line CC of FIG. The spray nozzle for wet blast according to the present invention includes a nozzle body 1, a flat nozzle body 2, and an air-nozzle body 4.

The nozzle main body 1 is formed in a cubic shape as a whole, and has a substantially cylindrical slurry chamber 8 slightly flattened to the left and right, both ends of which are closed by closed walls 6 and 7.
Are formed facing the longitudinal direction. Also, small-diameter slurry inflow holes 9 and 10 are formed in the closed wall surfaces 7 and 8 at positions offset from each other in the lateral direction with respect to the longitudinal axis of the slurry chamber 8. Further, the slurry inlet holes 9 and 10 are respectively provided on the closed wall surfaces 7 and 8.
The nozzle body side blocks 12, 12 'formed with a slurry passage 11 communicating with the nozzle body are fixed, and the slurry passages 11, 1 of the nozzle body side blocks 12, 12' are fixed.
Slurry flows into the slurry chamber 8 from the slurry inlet holes 9 and 10 through 1 '. That is, the slurry flows into the slurry chamber 8 from two opposing locations.

In the lower part of the slurry chamber 8, except for both ends of the slurry chamber 8, the width of the flat nozzle body fitting hole 13 is smaller than that of the slurry chamber 8 and substantially the same length. With slurry chamber-8 and nozzle body 1
An opening is formed so as to communicate with the lower surface. On the other hand, on the upper side of the slurry chamber 8, an air-nozzle body hole 14 is formed in the slurry.
An opening is provided to allow communication between the chamber 8 and the upper surface of the nozzle body 1.

The flat nozzle body 2 is composed of two rectangular nozzles 15, 15 '.
The lower end of the nozzle body 1 is fixed to the lower portion of the nozzle body 1 by sandwiching both sides thereof by holding pieces 16 and 16 ′ which are vertically provided from the lower end of the nozzle body 1 and tightening with bolts 17. 18 in the figure
Is a holding plate provided in the vicinity of the center of the flat nozzle main body 2. The lower part of the nozzle body 15, 15 'of the flat nozzle main body 2 is sandwiched and integrated by tightening with a bolt 36.

The nozzle bodies 15, 15 'are provided with nozzle grooves 19, 19 in the center thereof, respectively.
9 to form an elongated rectangular injection nozzle 20;
At the upper end of each of the nozzle grooves 19, a tapered inlet 21 is formed. The flat nozzle body 2 fits into the flat nozzle body fitting hole 13 of the nozzle body 1.

The air-nozzle body 4 includes a nozzle structure 22.
And an engaging portion 23 formed integrally with the upper end thereof, and projecting portions 27 and 27 '. That is, the nozzle structure 22 has the locking portions 23 protruding outward from the upper ends thereof, and the inclined surfaces 24 inclined toward the center at the lower ends. Also, overhang portions 27 and 27 'are provided at both ends in the longitudinal direction. A wide air intake groove 32 having both ends communicating with air intake holes 33, 33 'provided in the projecting portions 27, 27' is formed in the upper surface longitudinal axis. A narrow air slit 29 is provided below the bottom of the intake groove 32. At the lower end of the air-slit 29, small-diameter air-nozzles 30 are arranged in a row in the longitudinal direction to form an air-nozzle row 31. The air-nozzle body 4 thus formed is inserted into the slurry chamber 8 from the air-nozzle body mounting hole 14 of the nozzle body 1 so that the air-nozzle row 31 faces downward. Are superimposed and fixed by a plurality of bolts 35.

This embodiment has the structure as described above, and the slurry inlet holes 9 and 10 of the nozzle body 1 are provided.
A slurry in which water and an abrasive are mixed is sent into the slurry chamber 8 from the inside, while the air intake holes 33 and 3 are supplied.
High pressure air is sent into the air nozzle body 4 from 3 '.
Then, the slurry in the slurry chamber 8 is accelerated by the pressure of the high-pressure air and is ejected from the ejection nozzle 20 of the flat nozzle body 2. At this time,
Slurry inflow holes 9 and 10 for feeding the slurry into the slurry chamber 8 of the nozzle body 1 are offset from each other in the left-right direction with respect to the longitudinal axis of the slurry chamber 8. Because of this, the slurry introduced into the slurry chamber 8 rotates around the air nozzle body 4 as shown by the arrow in FIG. Accordingly, this constantly continually stirs the water and the abrasive, the abrasive is evenly dispersed in the water, is well mixed, and stagnation and uneven distribution of the abrasive is prevented. On the other hand, air
The high-pressure air introduced into the nozzle 4 is introduced from air-intake holes 33 and 33 ′ provided at both ends in the longitudinal direction thereof, and after being mixed in the air-intake groove 32, the air of the air-nozzle 4 is mixed. Since the air is sent to the groove 29, the air becomes an even air pressure, and is further divided evenly by the air-nozzle row 31, and the slurry is sent to the injection nozzle 20 of the flat nozzle body 2 at this uniform air pressure at a uniform concentration.

[0015]

As described above, in the spray nozzle for wet blast according to the present invention, the slurry is introduced by devising the introduction of the slurry into the slurry chamber.
This is very practical because it has the effect of causing the slurry in the chamber to generate rotational movement and constantly fluidizing it, thereby preventing processing unevenness due to uneven distribution of the abrasive.

[Brief description of the drawings]

FIG. 1 is a front sectional view of an embodiment of an injection nozzle for wet blast according to the present invention.

FIG. 2 is a cross-sectional view taken along line AA in FIG.

FIG. 3 is a vertical sectional view taken along line BB in FIG. 1;

FIG. 4 is a vertical sectional view taken along line CC in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nozzle main body 2 Flat nozzle main body 4 Air-nozzle main body 6 Closed wall 7 Closed wall 8 Slurry chamber 9 Slurry inflow hole 10 Slurry inflow hole 11 Slurry flow path 12 Nozzle body side block 13 Flat nozzle body fitting hole Reference Signs List 14 Air nozzle body mounting hole 15 Nozzle body 15 'Nozzle body 16 Clamping piece 17 Bolt 18 Clamping plate 19 Nozzle groove 20 Injection nozzle 21 Introducing part 22 Nozzle structure 23 Locking part 24 Inclined surface 25 Nozzle groove 26 Air introduction Groove 27 Overhang 29 Air-slit 30 Air-nozzle 31 Air-nozzle array 32 Air-intake groove 33 Air-intake hole 34 Top lid 35 Bolt 36 Bolt

Claims (1)

[Claims] 1. A cylindrical slurry chamber 8 whose both ends are closed by closed walls 6 and 7 is formed in the longitudinal direction, and the slurry chamber 8 is closed with respect to the slurry chamber-longitudinal axis of the closed walls 6 and 7. Slurry inflow holes 9 and 10 having small diameters are provided at positions deviated in a staggered manner in the left and right directions, and a slurry is supplied from the slurry inflow holes 9 and 10 to a slurry chamber 8.
When introduced into the slurry chamber 8
A nozzle main body 1 in which a rotary flow is formed; and an elongated rectangular injection nozzle 20 parallel to the slurry chamber 8, and a tapered introduction at an upper end of the injection nozzle 20. Part 21 is formed, and the introduction part 21 is connected to the slurry.
A flat nozzle main body 2 attached below the nozzle main body 1 so as to communicate with the chamber 8; and a penetrating center of the slurry chamber-longitudinal direction, and a front end positioned above the introduction portion 21 of the flat nozzle main body 2. , High pressure air at the tip
An air-nozzle row 31 is provided in which small-diameter air-nozzles 30 for injecting air are arranged in a line, and an air-intake groove 32 is provided at the upper end in parallel with the slurry chamber 8. Air-intake holes 33 and 33 'are communicated with both ends of the air-intake groove 32, and an air-nozzle body 4 for introducing high-pressure air from both sides of the air-intake groove 32. .