JP4737327B2 - Blasting spray nozzle - Google Patents

Description

The present invention relates to a blasting injection nozzle capable of uniformly performing processing in a wide region in blasting in which an injection material is injected onto a workpiece.

Conventionally, blasting technology has been used in the field of surface processing such as deburring, surface roughening, and hot water erasing of cast products. In recent years, however, large-scale blasting technology such as substrates for solar cell modules and plasma displays has been used. There is an increasing demand for uniform processing of substrates at high speed. In general, the blasting injection nozzle having a circular cross-section injection port that is widely used has a narrow width to which the injection material is injected. May use a blasting injection nozzle having an injection port of a rectangular cross section with the injection port widened laterally. However, such a blasting injection nozzle has a problem in that uniform blasting cannot be performed over the entire width of the injection port because the injection speed decreases at the end of the injection port in the long side direction.
In order to solve such a problem, for example, Patent Document 1 discloses an abrasive material diffusion portion in which a cross section in the width direction gradually narrows in the injection direction, and an abrasive material rectification formed in front of the abrasive material diffusion portion. A blasting nozzle that rectifies and jets an injection flow (solid-gas two-phase flow) of a mixed fluid of an injection material and a compressed gas into an elongated cross-sectional shape in an abrasive diffusion chamber composed of a portion is disclosed. .

Japanese Patent No. 4287528

However, when the solid-gas two-phase flow is rectified by the above-described method, the solid-gas two-phase flow collides at high speed with the inner wall of the abrasive diffusing portion or the abrasive rectifying portion, so that they are easily worn and damaged. Thereby, the replacement frequency of the constituent member of the blasting nozzle is increased, and there is a problem that durability is lowered.

Accordingly, an object of the present invention is to realize a highly durable blasting spray nozzle capable of uniformly processing a wide region.

In order to achieve the above object, according to the first aspect of the present invention, in the first aspect of the present invention, a gas injection unit that injects compressed gas, a supply port that supplies an injection material, and the gas injection unit and the supply port communicate with each other. And mixing the compressed gas supplied from the gas injection unit and the injection material supplied from the supply port to form a solid-gas two-phase flow, and the gas injection unit in communication with the mixing chamber And an injection material injection unit for injecting a solid-gas two-phase flow introduced from the mixing chamber onto a workpiece, the gas injection unit is a compressed gas The first flow path through which the gas flows is formed so that the cross section perpendicular to the compressed gas injection direction is rectangular, and the flow straightening section expands the flow of the compressed gas in the long side direction of the rectangular cross section to the opening through which the compressed gas is injected It comprises a to the rectification section The first flow path is provided in the first flow path so as to be perpendicular to the long side and symmetrical with respect to the center line of the long side, and is inclined in the long side direction of the rectangular cross section of the gas injection unit toward the injection direction of the compressed gas. A rectifying member having a rectifying surface that expands the compressed gas flow in the long side direction of the rectangular cross section of the gas injection unit, and the injection material injection unit is a second flow through which the solid-gas two-phase flow flows. The technical means that the cross section perpendicular to the injection direction is a rectangle and the long side direction of the rectangle is formed to coincide with the long side direction of the first flow path is used.

According to the invention of claim 1 can be extended at the opening of the gas jet unit, the direction of the long side of the rectangular cross section of the air flow more compressed gas to the rectifying surface of the rectifying member provided in the rectifying section. As a result, the compressed gas rectified into a uniform velocity distribution in the long side direction is mixed with the injection material supplied from the supply port in the mixing chamber to form a solid-gas two-phase flow, which is introduced into the injection material injection unit. be able to. This solid-gas two-phase flow is rectified so as to have a uniform velocity distribution in the long side direction, and the density of the spray material becomes uniform, so that a wide area in the long side direction of the spray material injection section is made uniform. Can be blasted. Thereby, since the width | variety which can be blasted at once can be enlarged, the processing efficiency of blasting can be improved.
In addition, since the flow of compressed air is rectified before forming the solid-gas two-phase flow, the solid-gas two-phase flow formed in the mixing chamber is directly introduced into the second flow path arranged in the same long side direction. Therefore, the solid-gas two-phase flow spreads inside the second flow path and does not collide with the inner wall, and it is possible to prevent the second flow path from being worn or damaged. In addition, since the spray material does not collide with the rectifying unit, it is not worn or damaged. Thereby, a highly durable blasting jet nozzle can be realized.

In the invention according to claim 2, formed in the blasting for injection nozzle according to claim 1, wherein the rectifying member, cross-section parallel to the long sides, the wider shape toward the direction of injection compressed gas The technical means is used.

According to invention of Claim 2 , the cross section parallel to a long side is formed in the shape which becomes so wide that it goes to the injection direction of compressed gas like a triangle, a semi-ellipse, a semicircle, etc., for example. Therefore, there is no vortex flow downstream of the flow straightening member, the flow of compressed gas can be flown to a uniform velocity distribution, and a wide area in the long side direction of the spray material injection unit can be uniformly blasted it can.

According to a third aspect of the present invention, in the blast processing injection nozzle according to the second aspect, the technical means is used in which the rectifying member is formed so that the width of the cross section is 1 mm or less. .

The width of the rectifying member is preferably 1 mm or less as in the invention described in claim 3 . This is because if the width exceeds 1 mm, the velocity of the airflow downstream of the rectifying member is reduced, so that a uniform velocity distribution cannot be achieved.

The invention according to claim 4, in blasting for injection nozzle according to any one of claims 1 to 3, the case of arranging a plurality of the rectifying member, the spacing between adjacent rectifying member than 3mm The technical means is used.

When arranging a plurality of rectifying members, it is preferable that the interval between adjacent rectifying members is 3 mm or more as in the invention described in claim 4 . When the distance between the rectifying members is less than 3 mm, the flow resistance of the compressed gas flow increases, so the flow rate of the compressed gas passing between the rectifying members decreases, and the air flow that is injected from the injection material injection unit onto the workpiece. This is because the machining efficiency is reduced because the injection speed of the nozzle becomes slower.

In the invention according to claim 5 , the gas injection unit for injecting compressed gas, the supply port for supplying the injection material, the gas injection unit and the supply port communicate with each other, and the compression supplied from the gas injection unit Mixing the gas and the injection material supplied from the supply port, forming a solid-gas two-phase flow, provided in the extension direction of the gas injection unit in communication with the mixing chamber, from the mixing chamber An injection material injection unit that injects an introduced solid-gas two-phase flow onto a workpiece, wherein the gas injection unit has a first flow path through which compressed gas flows. A cross section perpendicular to the injection direction is formed to have a rectangular shape, and includes a rectifying unit that expands the flow of compressed gas in the long side direction of the rectangular cross section at an opening where the compressed gas is injected. Long side toward gas injection direction Includes an inclined surface extending the inclined surface has met the inclination angle theta is 0 ° <θ ≦ 3.7 ° inclined with respect to the injection direction, the injection material injection unit, the solid-gas two The second flow path through which the phase flow flows has a rectangular cross section perpendicular to the injection direction, and the long side direction of the rectangle is formed to coincide with the long side direction of the first flow path. Use technical means.

In the configuration in which the rectifying unit includes an inclined surface that extends in the long side direction toward the injection direction of the compressed gas, the inclination angle θ at which the inclined surface is inclined with respect to the injection direction is as in the invention according to claim 5. It is preferable to satisfy 0 ° <θ ≦ 3.7 °. If θ exceeds 3.7 °, the air flow becomes too wide to increase the speed of the air flow at the end portion in the long side direction, and the processing amount increases. Therefore, a wide area in the long side direction of the injection material injection unit is increased. This is because it cannot be uniformly blasted.

According to a sixth aspect of the present invention, in the blast machining injection nozzle according to any one of the first to fifth aspects, the injection material injection portion having a cross-sectional area S1 of the opening of the gas injection portion. The technical means that the cross-sectional area ratio S1 / S2 with respect to the cross-sectional area S2 of the second flow path satisfies 0.1 ≦ S1 / S2 ≦ 0.4 is used.

The cross-sectional area ratio S1 / S2 of the cross-sectional area S1 of the opening of the gas injection unit to the cross-sectional area S2 of the second flow path of the injection material injection unit is 0.1 ≦ S1 as in the invention of claim 6. It is preferable to satisfy /S2≦0.4. If S1 / S2 is less than 0.1, the injection speed is greatly reduced, so that a sufficient machining depth cannot be obtained. Further, when S1 / S2 exceeds 0.4, the negative pressure generated for sucking the injection material in the mixing chamber decreases, and stable injection cannot be performed.

According to the seventh aspect of the present invention, the blasting apparatus performs blasting on the workpiece by injecting the spraying material from the nozzle onto the workpiece and scanning the workpiece or the abrasive spray nozzle. Then, the technical means that the spray nozzle according to any one of claims 1 to 6 is provided is used.

According to the invention described in claim 7, it is possible to realize a blasting device which can achieve the same effect as described in any one of claims 1 to 6.

It is sectional explanatory drawing of the blast processing injection nozzle. 1A is a cross-sectional view in the short side direction, and FIG. 1B is a cross-sectional view in the long side direction. It is explanatory drawing which shows the influence which arrangement | positioning of a baffle member has on a blasting state. It is explanatory drawing which shows the influence which the magnitude | size of a baffle member has on the blasting state. It is explanatory drawing which shows the influence which the shape of a baffle member has on the blasting state. It is explanatory drawing which shows the relationship between the cross-sectional area ratio S1 / S2 with respect to the cross-sectional area S2 of the injection material injection part of the cross-sectional area S1 of the opening part of a gas injection part, and (A) processing depth and (B) generated negative pressure. . It is a section explanatory view of the blast processing injection nozzle of other embodiments.

The blasting injection nozzle of the present invention will be described with reference to the drawings. As shown in FIG. 1, the nozzle 10 includes a gas injection unit 11 connected to a compressed gas supply device (not shown) that supplies compressed gas, and an injection material hopper (not shown) that supplies a predetermined amount of injection material. And the supply port 12 for supplying the injection material, the gas injection portion 11 and the supply port, respectively, and the compressed gas supplied from the gas injection portion 11 and the injection material supplied from the supply port 12. And a mixing chamber 13 that forms a solid-gas two-phase flow, and an injection material injection unit 14 that injects the solid-gas two-phase flow introduced from the mixing chamber 13 onto the workpiece. The mixing chamber 13 is formed inside an injection unit holder 15 in which the gas injection unit 11 and the injection material injection unit 14 are arranged on a straight line.

A first flow path 11a through which the compressed gas flows is formed in the gas injection unit 11 so that a cross section perpendicular to the compressed gas injection direction X is rectangular. Here, the vertical direction in FIG. 1A is a rectangular short-side direction, and the vertical direction in FIG. 1B is a long-side direction.

An inclined portion 11c is formed at the tip of the gas injection portion 11 so that the length of the short side continuously decreases toward the opening portion 11b. The supply port 12 is provided with an injection unit holder 15 so as to form an acute angle with respect to the injection direction X from the long side toward the inclined portion 11c. With these configurations, the injection material can be smoothly introduced into the mixing chamber 13, the compressed gas and the injection material can be easily mixed, and a solid-gas two-phase flow with a uniform density of the injection material can be formed. .

The opening 11b of the gas injection unit 11 is formed with a rectifying unit 20 that widens a compressed gas flow in the long side direction. The rectifying unit 20 is provided with a rectifying member 21 having a rectifying surface 21a that expands the flow of compressed gas in the long-side direction of the rectangular cross section of the gas-injecting unit, perpendicular to the long side and symmetrical with respect to the center line of the long side. The first flow path 11a is partitioned. In order to more effectively spread the compressed gas stream in the long side direction, it is preferable to use a plurality of rectifying members 21.

In the present embodiment, the rectifying member 21 is formed in a long and narrow triangle so that the cross section parallel to the long side is formed in a shape that is wider toward the injection direction X of the compressed gas. The rectifying surface 21a is inclined outward by several degrees with respect to the injection direction X, and the air flow of the compressed gas can be expanded in the long side direction. Further, in order to reduce the turbulence of the compressed gas flow, the rectifying member 21 itself is arranged so as not to be inclined more than necessary with respect to the injection direction X.

A second flow path 14a through which the solid-gas two-phase flow introduced from the mixing chamber 13 flows is formed in the injection material injection unit 14 so that a cross section perpendicular to the injection direction is rectangular. As shown in FIG. 1C, the long side of the cross section of the second flow path 14a is formed so as to coincide with the long side direction of the first flow path 11a. It is almost the same as the length of the long side. The short side is formed longer than the short side of the opening 11b. When the second flow path 14a is viewed from the injection port side, the first flow path 11a having a long side and a short short side is arranged in the center.

Blasting can be performed as follows using the nozzle 10 of the first embodiment. When compressed gas is supplied from the compressed gas supply device to the gas injection unit 11, the supplied compressed gas flows through the first flow path 11a. At this time, the air flow of the compressed gas has a velocity distribution in which the flow velocity in the central portion is high and the flow velocity becomes slower toward the outside in the long side direction.

When the compressed gas stream reaches the rectifying unit 20 formed in the opening 11b of the gas injection unit 11, the compressed gas stream is guided in the rectifying surface 21a of the rectifying member 21, and the compressed gas stream is spread in the long side direction. Rectification is performed so that the velocity distribution is uniform in the direction.

When the rectified compressed gas is injected from the tip of the gas injection unit 11 into the mixing chamber 13, the inside of the mixing chamber 13 becomes negative pressure, and the injection material is introduced from the supply port 12. The propellant is mixed in a rectified compressed gas stream, and a solid-gas two-phase flow having a uniform velocity distribution in the long side direction and a uniform density of the propellant is formed.

The solid-gas two-phase flow formed in the mixing chamber 13 is introduced into the second flow path 14 a of the injection material injection unit 14. Here, since the opening part 11b of the gas injection part 11 and the 2nd flow path 14a have the relationship shown in FIG.1 (C), the flow of the solid-gas two-phase flow formed in the mixing chamber 13 is a long side direction. In this case, it is injected into the workpiece while maintaining a uniform velocity distribution in the long side direction. By relatively moving the nozzle 10 in the short side direction with respect to the workpiece, a wide region in the long side direction of the spray material injection unit 14 can be uniformly blasted. Thereby, since the width | variety which can be blasted at once can be enlarged, the processing efficiency of blasting can be improved.

Since the solid-gas two-phase flow formed in the mixing chamber 13 is directly introduced into the second flow path 14a, the solid-gas two-phase flow spreads inside the second flow path and is less likely to collide with the inner wall. The second flow path can be prevented from being worn or damaged. In addition, since the spray material does not collide with the rectifying unit 21, it is not worn out or damaged.

Example 1
In this example, the influence of the arrangement of the rectifying member 21 on the blasting state was examined. The present invention is not limited to the following examples.

Using a nozzle 10 having a long side width of D (D = 18 mm, 15 mm), a blasting test of a flat plate sample is performed, a line profile of a processing depth in the long side direction is measured after blasting, and the quality of the blasting is determined. Judged.

Two rectifying members 21 having a right cross-sectional shape with a width of 1 mm and a length of 10 mm were used, and the rectifying members 21 were arranged so that the hypotenuses were on the outside.

FIG. 2 shows a line profile of the processing depth when the nozzle 10 having a long side width of 18 mm is used and the interval B between the adjacent rectifying members 21 is set to 2 mm and 3 mm. When the interval B between the rectifying members 21 was 3 mm, uniform blasting was possible in which the processing depth was within the range of 5 to 10 μm. On the other hand, when the interval B between the rectifying members 21 is 2 mm, the processing amount is small in a region corresponding to the space between the rectifying members 21, and uniform blasting cannot be performed. When the interval B between the rectifying members 21 is reduced, the flow resistance of the compressed gas flow increases, so the flow rate of the compressed gas passing between the rectifying members 21 is slowed and injected from the injection material injection unit onto the workpiece. This is probably because the jetting speed of the airflow is slowed down, so that the processing efficiency is lowered.

When the nozzle 10 having a long side width of 18 mm is used and the interval B between the rectifying members 21 is set to 2 to 5 mm, the interval B between the rectifying members 21 is set to 3 mm using the nozzle 10 having a long side width of 15 mm. Table 1 shows the results of blasting in this case. It is confirmed that good blasting is possible when the distance B between the adjacent rectifying members 21 is 3 mm or more even when the long side is 18 mm or 15 mm, and the interval between the adjacent rectifying members 21 is preferably 3 mm or more. It was.

(Example 2)
The influence of the size of the rectifying member 21 on the blasting state was examined. Using a nozzle 10 having a long side width of 18 mm, a blasting test was performed under the same conditions as in Example 1, and the quality of the blasting was judged. As the rectifying member 21, as shown in FIG. 3, one member having an isosceles triangle shape having a transverse cross section of 2 mm in width and 10 mm in length was used and arranged at the center of the long side.

In the rectifying member 21 of the present embodiment, almost no processing was performed downstream of the rectifying member 21. If the width of the rectifying member 21 exceeds 1 mm, the velocity of the airflow downstream of the rectifying member 21 decreases, so that a uniform velocity distribution cannot be achieved, and the injection material downstream of the rectifying member 21 This is thought to be due to the diluting concentration. Thereby, it was confirmed that the width of the rectifying member 21 is preferably 1 mm or less.

(Example 3)
The influence of the shape of the rectifying member 21 on the blasting state was examined. Using a nozzle 10 having a long side width of 18 mm, a blasting test was performed under the same conditions as in Example 1, and the quality of the blasting was judged. As the rectifying member 21, one whose cross-sectional shape as shown in FIG. 4 (A) was formed in a rhombus or an ellipse was used, and it was arranged at the center of the long side. The rectifying member 21 having these shapes has a portion whose width becomes narrower in the injection direction.

When the cross-sectional shape is a rhombus, the processing depth varies and, as shown in FIG. 4 (B), the boundary between the processed part and the unprocessed part is disturbed in a wavy shape, and good blasting cannot be performed. It was. In addition, when the cross-sectional shape is an ellipse, the machining width becomes small, and the boundary between the processed part and the unprocessed part is disturbed in a wave shape, so that good blasting cannot be performed. It is considered that these are because a vortex was generated downstream of the rectifying member 21 due to the presence of a portion with a narrow width. As a result, when the cross-sectional shape is wider as it goes in the jet direction of the compressed gas, such as a triangle, a semi-ellipse, and a semi-circle, no vortex is generated downstream of the rectifying member 21, and the compressed gas It was confirmed that the air flow can be rectified into a uniform velocity distribution, and a wide area can be uniformly blasted, which is preferable.

Example 4
The cross-sectional area ratio S1 / S2 of the cross-sectional area S1 of the opening 11b of the gas injection unit 11 to the cross-sectional area S2 of the second flow path 14a of the injection material injection unit 14, (A) processing depth, and (B) generation negative The relationship with pressure was investigated. As shown in FIG. 5 (A), when S1 / S2 is less than 0.1, the injection speed is greatly reduced, so that a sufficient processing depth cannot be obtained. As shown in FIG. 5B, when S1 / S2 exceeds 0.4, the negative pressure generated to suck the injection material in the mixing chamber 13 decreases, and stable injection can be performed. Disappear. Thereby, it was confirmed that the cross-sectional area ratio S1 / S2 preferably satisfies 0.1 ≦ S1 / S2 ≦ 0.4.

(Example of change)
The number of the rectifying members 21, the arrangement interval, and the like can be appropriately selected according to the intended processing width.

[Effect of the embodiment]
According to the nozzle 10 of the present invention, the flow of compressed gas can be expanded in the long side direction of the rectangular cross section by the rectifying unit 20 (rectifying member 21) in the opening 11b of the gas injection unit 11. As a result, the compressed gas rectified into a uniform velocity distribution in the long side direction is mixed with the injection material supplied from the supply port 12 in the mixing chamber 13 to form a solid-gas two-phase flow, and the injection material injection unit 14 Can be introduced. This solid-gas two-phase flow is rectified so as to have a uniform velocity distribution in the long side direction, and the density of the spray material becomes uniform, so that a wide area in the long side direction of the spray material injection unit 14 is uniformly distributed. Can be blasted. Thereby, since the width | variety which can be blasted at once can be enlarged, the processing efficiency of blasting can be improved.
Further, since the flow of compressed air is rectified before forming the solid-gas two-phase flow, the solid-gas two-phase flow formed in the mixing chamber 13 is directly applied to the second flow path 14a arranged in the same long side direction. Since it is introduced, the solid-gas two-phase flow spreads inside the second flow path 14a and is less likely to collide with the inner wall, thereby preventing the second flow path 14a from being worn or damaged. In addition, since the spray material does not collide with the rectifying unit 21, it is not worn out or damaged. Thereby, the highly durable nozzle 10 is realizable.

[Other Embodiments]
As shown in FIG. 6, the rectification | straightening part 20 can also employ | adopt the structure provided with the inclined surface 22 which spreads in a long side direction toward the injection direction of compressed gas. Since the airflow of the compressed gas flowing through the first flow path 11a of the gas injection unit 11 is guided and spreads outward in the long side direction by the inclined surface 22, the long side direction of the injection material injection unit 14 is the same as in the above-described embodiment. Can be blasted uniformly over a wide area. Here, it is preferable that the inclination angle θ at which the inclined surface 22 is inclined with respect to the injection direction satisfies 0 ° <θ ≦ 3.7 °. If θ exceeds 3.7 °, the air flow becomes too wide and the speed of the air flow at the end in the long side direction increases, and the amount of processing increases, so a wide area in the long side direction is uniformly blasted. Because you can't.

DESCRIPTION OF SYMBOLS 10 Nozzle 11 Gas injection part 11a 1st flow path 11b Opening part 12 Supply port 13 Mixing chamber 14 Injection material injection part 14a 2nd flow path 20 Rectification part 21 Rectification member

Claims (7)

A gas injection unit for injecting compressed gas;
A supply port for supplying propellant,
A mixing chamber that communicates with each of the gas injection unit and the supply port, mixes the compressed gas supplied from the gas injection unit and the injection material supplied from the supply port, and forms a solid-gas two-phase flow;
An injection material injection unit that communicates with the mixing chamber and is provided in an extending direction of the gas injection unit, and injects a solid-gas two-phase flow introduced from the mixing chamber onto a workpiece;
In the blasting injection nozzle with
The gas injection part is formed such that the first flow path through which the compressed gas flows is a rectangle having a rectangular cross section perpendicular to the injection direction of the compressed gas, and the compressed gas flow is injected into the opening through which the compressed gas is injected into the rectangular cross section. It has a rectifying part that extends in the long side direction,
The rectifying unit is provided inside the first flow path so as to be perpendicular to the long side and symmetrical with respect to the center line of the long side, and has a rectangular cross section of the gas injection unit toward the injection direction of the compressed gas. A rectifying member having a rectifying surface that is inclined in the long side direction and expands the air flow of compressed gas in the long side direction of the rectangular cross section of the gas injection part is provided,
In the injection material injection section, the second flow path through which the solid-gas two-phase flow flows has a rectangular cross section perpendicular to the injection direction, and the long side direction of the rectangle is the long side direction of the first flow path An injection nozzle for blasting, characterized in that it is formed so as to match. 2. The blasting injection nozzle according to claim 1 , wherein the rectifying member is formed in a shape in which a cross section parallel to a long side is wide in a direction in which compressed gas is injected. The jet nozzle for blasting according to claim 2 , wherein the rectifying member is formed so that a width of the cross section is 1 mm or less. When arranging a plurality of the rectifying member, blasting a jet nozzle according to any one of claims 1 to 3, wherein the spacing between adjacent flow control member is 3mm or more. A gas injection unit for injecting compressed gas;
A supply port for supplying propellant,
A mixing chamber that communicates with each of the gas injection unit and the supply port, mixes the compressed gas supplied from the gas injection unit and the injection material supplied from the supply port, and forms a solid-gas two-phase flow;
An injection material injection unit that communicates with the mixing chamber and is provided in an extending direction of the gas injection unit, and injects a solid-gas two-phase flow introduced from the mixing chamber onto a workpiece;
In the blasting injection nozzle with
The gas injection part is formed such that the first flow path through which the compressed gas flows is a rectangle having a rectangular cross section perpendicular to the injection direction of the compressed gas, and the compressed gas flow is injected into the opening through which the compressed gas is injected into the rectangular cross section. It has a rectifying part that extends in the long side direction,
The rectifying unit includes an inclined surface that extends in the long side direction toward the injection direction of the compressed gas, and an inclination angle θ at which the inclined surface is inclined with respect to the injection direction satisfies 0 ° <θ ≦ 3.7 °. It has been met,
In the injection material injection section, the second flow path through which the solid-gas two-phase flow flows has a rectangular cross section perpendicular to the injection direction, and the long side direction of the rectangle is the long side direction of the first flow path An injection nozzle for blasting, characterized in that it is formed so as to match. The cross-sectional area ratio S1 / S2 of the cross-sectional area S1 of the opening of the gas injection unit to the cross-sectional area S2 of the second flow path of the injection material injection unit satisfies 0.1 ≦ S1 / S2 ≦ 0.4. The blasting injection nozzle according to any one of claims 1 to 5 , wherein: A blasting apparatus for blasting a workpiece by injecting an injection material from a nozzle onto the workpiece and scanning the workpiece or an abrasive nozzle. A blasting apparatus comprising the spray nozzle according to any one of Items 6 .

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