JP2020075303A - Nozzle and blast device - Google Patents

Abstract

To provide a nozzle capable of exerting preferred machining performance on various structures to be treated, and a blast device comprising the same.SOLUTION: A nozzle 6 of one embodiment comprises an introduction passage 63 for a projection material M, an injection hole 62A for the projection material M, and an injection passage 64A for connecting the introduction passage 63 to the injection hole 62A. In the nozzle 6, an axis X2A of the injection passage 64A includes a curved part in either of the case of being projected on a first two-dimensional plane and the case of being projected on a second two-dimensional plane orthogonal to the first two-dimensional plane.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a nozzle for ejecting a shot material and a blasting device including the nozzle.

  BACKGROUND ART Conventionally, a blasting process of spraying a shot material onto the surface of a work has been carried out for surface grinding of a work (workpiece) such as metal or ceramic, removal of burrs, or satin finish (for example, see Patent Document 1). ).

  In recent years, metal 3D printers have been put to practical use. For example, in the case of a metal 3D printer using a laser sintering method or the like, a metal article is formed by repeating the operation of irradiating a powdery metal material with a laser. By using a metal 3D printer, it becomes possible to manufacture a metal article having a complicated internal shape which has been difficult to realize in the past.

JP, 2004-351522, A

  For example, when the inner surface of the bent conduit is blasted, it may be difficult to reach the inside of the conduit if the nozzle is long. Further, in a bent conduit, it may be difficult to rotate the nozzle so that the projection material is applied to the entire surface of the conduit. In particular, these problems may be remarkable in an article having a complicated internal shape produced by the above-described metal 3D printer.

  On the other hand, if the nozzle is shortened, the shot material supplied through the blast hose or the like cannot be sufficiently accelerated in the nozzle. If the acceleration of the shot material is insufficient, there is a possibility that the desired processing performance for the work cannot be obtained.

  Therefore, it is an object of the present invention to provide a nozzle capable of exhibiting suitable processing performance for various structures to be processed and a blasting device equipped with the nozzle.

  The nozzle according to one embodiment includes an introduction path for the shot material, an injection hole for the shot material, and an injection path connecting the introduction path and the injection hole. In this nozzle, the axis of the ejection path includes a curved portion both when projected on the first two-dimensional plane and when projected on the second two-dimensional plane orthogonal to the first two-dimensional plane. ..

  The axis of the injection path may be inclined at an angle of 30 ° or more and 60 ° or less with respect to the axis of the introduction path in the injection hole. Further, at least a part of the injection path may be spiral. In this case, at least a part of the injection path may have a spiral shape in which the distance from the axis of the introduction path increases as it approaches the injection hole.

  The nozzle may include a pair of injection holes and a pair of injection paths that respectively connect the introduction path and the pair of injection holes. In this case, at least a part of the pair of injection paths may form a double spiral. Further, each of the pair of injection holes may be provided at a position that is displaced from the axis of the introduction path and that the phases around the axis of the introduction path are displaced from each other.

  The nozzle may further include a rotating body including an introduction path, an injection hole, and an injection path, and a holder that rotatably holds the rotating body. In this case, the injection hole may be located at a position away from the rotation axis of the rotating body, and may eject the projection material so as to have a velocity component in the circumferential direction around the rotation axis. Further, the rotating body may be rotated by a reaction force when the projection material is ejected from the ejection hole.

  The holder may have a hollow shape in which the rotating body is inserted. In this case, one of the inner surface of the holder and the outer surface of the rotating body has an annular concave portion along the circumferential direction, and the other has a convex portion inserted in the concave portion. It may be retained in the direction. Further, the rotating body may further include a communication passage that communicates the gap formed between the outer surface of the rotating body and the inner surface of the holder with the introduction passage.

  A blasting device according to one embodiment includes a nozzle having each of the above-described configurations and a supply device that supplies a projection material to the nozzle.

  ADVANTAGE OF THE INVENTION According to this invention, the nozzle which can exhibit suitable processing performance with respect to various to-be-processed structures, and the blast apparatus provided with the said nozzle can be provided.

FIG. 1 is a diagram showing a schematic configuration of a blasting apparatus according to the first embodiment. FIG. 2 is a schematic vertical sectional view along the axis of the nozzle according to the embodiment. FIG. 3 is a schematic perspective view of a pair of ejection paths provided in the nozzle according to the embodiment. FIG. 4 is a schematic diagram for explaining the shapes of a pair of ejection paths in the nozzle according to the same embodiment. FIG. 5 is a schematic vertical cross-sectional view along the axis of the nozzle according to the second embodiment. FIG. 6 is a schematic external view of the nozzle according to the embodiment.

  Some embodiments of the present invention will be described with reference to the drawings. In each of the embodiments, a pneumatic blast device for injecting a shot material with compressed air and a nozzle thereof are disclosed. However, the configuration of the nozzle disclosed in each embodiment can also be applied to a blasting device of another type such as a wet type.

[First Embodiment]
FIG. 1 is a diagram showing a schematic configuration of a blasting device 1 according to the first embodiment. The blasting device 1 includes a compressor 2, a supply device 3, a joint pipe 4, a hose 5, and a nozzle 6. The blast device 1 may further include a dust collector for collecting the shot material, a processing chamber for performing the blast treatment, and the like.

  The compressor 2 and the supply device 3 are connected by a joint pipe 4. The hose 5 has, for example, a structure excellent in pressure resistance and flexibility, and is connected to the supply device 3. The nozzle 6 is attached to the tip of the hose 5.

  The compressor 2 compresses air to a predetermined pressure. This compressed air is sent to the supply device 3 via the joint pipe 4. The supply device 3 includes a tank 31, a supply path 32, and a screw 33.

  The projection material M is accommodated in the tank 31. The supply path 32 is connected to the joint pipe 4 and the hose 5. When the screw 33 is rotationally driven, the projection material M in the tank 31 is supplied to the supply path 32. The shot material M is sent to the hose 5 together with the compressed air from the compressor 2. The projection material M sent to the hose 5 is jetted from the nozzle 6. The projection material M is not particularly limited, and for example, a granular material such as metal, ceramic, plastic, sand, or dry ice can be used.

  FIG. 2 is a schematic vertical sectional view taken along the axis X1 of the nozzle 6. The nozzle 6 has, for example, an outer shape obtained by rotating the illustrated outer shape around the axis X1. The nozzle 6 includes an insertion portion 60 for inserting into the hose 5, and a tip portion 61 having a diameter larger than that of the insertion portion 60. The insertion portion 60 and the tip portion 61 are lined up along the axis X1.

  In the present embodiment, it is assumed that the insertion portion 60 and the tip portion 61 are integrally formed of a metal material. However, the insertion portion 60 and the tip portion 61 may be formed separately and connected by an appropriate method such as screwing.

  The insertion portion 60 has a plurality of grooves 60a on the outer peripheral surface. The hose 5 and the nozzle 6 can be connected to each other, for example, by inserting the insertion portion 60 into the hose 5 and pressing the outer peripheral surface of the hose 5 with an annular clamp 7 as illustrated. The clamp 7 faces each groove 60 a via the hose 5. In this case, the hose 5 is curved according to the shape of each groove 60a, and comes into close contact with at least a portion of the insertion portion 60 where the groove 60a is not provided (a convex portion on the outer peripheral surface of the insertion portion 60). As a result, the outer peripheral surface of the insertion portion 60 and the inner surface of the hose 5 are hermetically sealed.

  The configuration for connecting the hose 5 and the nozzle 6 is not limited to the example of FIG. For example, the hose 5 and the nozzle 6 may each be connected to a blast gun having a trigger operated by a finger of an operator.

  The tip portion 61 has a first injection hole 62A and a second injection hole 62B on the outer surface. The outer surface of the tip portion 61 is, for example, entirely spherical. In this way, if the outer surface of the tip portion 61 has a shape that tapers away from the insertion portion 60, it is easy to insert the nozzle 6 into a conduit or the like. Further, if the outer surface is spherical, the nozzle 6 is unlikely to be caught in the bent portion of the conduit or the like. However, the outer surface of the tip portion 61 may include a flat surface at least in part, or may include a plurality of curved surfaces having different curvatures.

  The nozzle 6 includes an introduction path 63 through which the projection material M supplied by the hose 5 is introduced, a first injection path 64A connecting the introduction path 63 and the first injection hole 62A, an introduction path 63 and a second injection hole 62B. And a second injection path 64B connecting the two. In FIG. 2, the shapes of the ejection paths 64A, 64B located on the back side of the drawing with respect to the illustrated cross section are indicated by broken lines, and the shapes of the ejection paths 64A, 64B located on the front side of the drawing with respect to the section are two points. It is indicated by a chain line.

  In the example of FIG. 2, the introduction path 63 has a first portion 631 and a second portion 632. The first portion 631 opens at the end surface of the insertion portion 60 inserted in the hose 5. The second portion 632 is located between the first portion 631 and each injection passage 64A, 64B in the direction along the axis X1.

  The first portion 631 has a shape that tapers toward the second portion 632. As an example, the first portion 631 has a shape corresponding to a part of a cone about the axis X1. The second portion 632 has a uniform width in the direction orthogonal to the axis X1. As an example, the second portion 632 has a cylindrical shape centered on the axis X1.

  In the example of FIG. 2, the width W1 of the first portion 631 along the axis X1 is larger than the width W2 of the second portion 632 along the axis X1. However, the width W1 and the width W2 may be the same, or the width W1 may be smaller than the width W2.

  The first injection passage 64A is connected to the second portion 632 through the first opening 65A. The second injection path 64B is connected to the second portion 632 through the second opening 65B.

  The width W3 of each injection path 64A, 64B along the axis X1 is smaller than the sum of the width W1 and the width W2, for example. However, the width W3 may be greater than or equal to the total. Further, the width of the first injection path 64A and the width of the second injection path 64B may be different.

  FIG. 3 is a schematic perspective view of the first injection passage 64A and the second injection passage 64B. Each of the injection paths 64A and 64B has a three-dimensional shape whose inner surface is a smooth curved surface. In this embodiment, each injection path 64A, 64B constitutes a double spiral. Specifically, each of the injection paths 64A and 64B spirals around the axis X1 (see FIG. 2) and does not intersect with each other.

  In the example of FIG. 3, both the first opening 65A of the first injection path 64A and the second opening 65B of the second injection path 64B are semicircular. Thereby, the openings 65A and 65B can be made as large as possible, and the pressure loss near the openings 65A and 65B can be suppressed. However, the openings 65A and 65B may have a shape other than the semicircular shape.

  The area of the first opening 65A is larger than the area of the first injection hole 62A. For example, in the first injection path 64A, the cross-sectional area (the area of the cross section orthogonal to the axis X2A described later) decreases smoothly from the first opening 65A toward the middle portion, and the cross-sectional area near the first injection hole 62A is reduced. It has a smoothly increasing shape. The cross-sectional shape of the first injection passage 64A is semicircular near the first opening 65A, but is circular (including a perfect circle and an ellipse) in the middle portion and the first injection hole 62A.

  Similarly, the area of the second opening 65B is larger than the area of the second injection hole 62B. For example, in the second injection passage 64B, the cross-sectional area (the area of the cross section orthogonal to the axis X2B described later) decreases smoothly from the second opening 65B toward the middle portion, and the cross-sectional area near the second injection hole 62B is reduced. It has a smoothly increasing shape. The cross-sectional shape of the second injection passage 64B is semicircular near the second opening 65B, but is circular (including a perfect circle and an ellipse) in the middle portion and the second injection hole 62B.

  The injection paths 64A and 64B may be rotationally symmetrical with respect to the axis X1 described above. In this case, the design of the ejection paths 64A and 64B is facilitated, and the ejection conditions of the projection material M in the ejection holes 62A and 62B can be made uniform.

  Here, as shown in FIG. 2, the axis of the first injection path 64A (the line segment connecting the centers of the respective cross sections of the first injection path 64A) is X2A, and the axis of the second injection path 64B (the second injection path 64B). X2B is defined as a line segment that connects the centers of the respective cross sections. The shapes of the axes X2A and X2B in FIG. 2 correspond to those obtained by projecting the axes X2A and X2B of the injection paths 64A and 64B having the three-dimensional shape as shown in FIG. 3 onto a plane (cross section).

  In the vicinity of the first injection hole 62A, the axis X2A is inclined at an angle θ1 which is an acute angle with respect to the axis X1. The projection material M is ejected from the first ejection hole 62A with the direction of the angle θ1 as the main direction. For example, from the viewpoint of the efficiency of the blasting process using the nozzle 6, the angle θ1 is preferably set in the range of 30 ° or more and 90 ° or less, and more preferably in the range of 40 ° or more and 60 ° or less. As an example, the angle θ1 is 45 °.

  When the angle θ1 is defined more specifically, with respect to the axis X2A projected on the plane including the position OA of the axis X2A and the axis X1 in the first injection hole 62A, the tangent line of the axis X2A and the axis X1 at the position OA are defined. It can be called the angle formed.

  For example, also in the vicinity of the second injection hole 62B, the axis X2B is also inclined at an angle θ1 with respect to the axis X1. However, the angle at which the axis X2A is inclined with respect to the axis X1 in the vicinity of the first injection hole 62A and the angle at which the axis X2B is inclined with respect to the axis X1 in the vicinity of the second injection hole 62B may be different from each other.

  In the example of FIG. 2, the positions OA and OB are in the same plane. Further, in the example of FIG. 2, the position PA of the axis X2A in the first opening 65A and the position PB of the axis X2B in the second opening 65B are also in the same plane as the positions OA and OB. However, at least one of the positions OA, OB, PA, PB may not be in the same plane.

  FIG. 4 is a schematic diagram for explaining the shapes of the injection paths 64A and 64B as viewed along the axis X1. In this figure, the injection holes 62A and 62B projected on a plane orthogonal to the axis X1, the injection paths 64A and 64B, the openings 65A and 65B, and the axes X2A and X2B are shown.

  In the example of FIG. 4, each of the axes X2A and X2B (each of the injection paths 64A and 64B) spirals around the axis X1 once (360 °). Further, the injection holes 62A and 62B are located farther from the axis X1 than the openings 65A and 65B are. As a result, each of the injection paths 64A and 64B has a spiral shape such that the distance from the axis X1 increases toward the injection holes 62A and 62B, respectively. However, each of the axes X2A and X2B may have a shape that swirls around the axis X1 by more than 360 ° or less than 360 °. Further, a part of each of the axes X2A and X2B may include a non-spiral part such as a straight line.

  The injection holes 62A and 62B are provided at positions that are offset from the axis X1 and that are out of phase with each other about the axis X1. In the example of FIG. 4, the phase of each injection hole 62A, 62B is shifted by 180 °, but the phase of each injection hole 62A, 62B may be shifted by another angle.

  In the example of FIG. 4, both the first injection hole 62A and the first opening 65A are located in the area on the left side of the axis X1, and part of the axis X1A passes through the area on the right side of the axis X1. Similarly, both the second injection hole 62B and the second opening 65B are located in the area on the right side of the axis X1, and part of the axis X1B passes through the area on the left side of the axis X1.

  In the plane of FIG. 4, in the vicinity of the first injection hole 62A, the axis X2A is inclined at an angle θ2 with respect to the radial direction RA centered on the axis X1. When the angle θ2 is defined more specifically, it can be said that it is an angle formed by a tangent line of the axis X2A at the position OA and a straight line connecting the axis X1 and the position OA with respect to the axis X2A projected on a plane orthogonal to the axis X1.

  For example, also in the vicinity of the second injection hole 62B, the axis X2B is similarly inclined at an angle θ2 with respect to the radial direction. However, the angle at which the axis X2A inclines in the radial direction in the vicinity of the first injection hole 62A and the angle in which the axis X2B inclines in the radial direction in the vicinity of the second injection hole 62B may be different from each other.

  The angle θ2 is, for example, 90 ° or less, but may be another angle. When it is necessary to reduce the moment applied to the nozzle 6 at the time of jetting the shot material M, the angle θ2 may be set to a small angle of about 45 ° or less, preferably 0 °.

  The nozzle 6 can be manufactured by, for example, a metal 3D printer. In this case, it is possible to realize the spiral injection paths 64A and 64B shown in FIGS. 2 to 4, which are difficult to manufacture by conventional machining. However, the manufacturing method of the nozzle 6 is not limited to the method using the 3D printer.

  In the above-described present embodiment, the axes X1A and X1B of the injection paths 64A and 64B include curved portions. In this case, the length of each injection passage 64A, 64B can be made larger than the width W3 of each injection passage 64A, 64B shown in FIG.

  If each injection path 64A, 64B is linear along the axis X1, the length of each injection path 64A, 64B becomes equal to the width W3. In this case, in order to sufficiently accelerate the blast material M in each of the injection paths 64A and 64B, the width W3 must be increased. However, if the width W3 is large, it may be difficult to make the nozzle 6 reach deep inside the structure to be processed when performing blast processing on a complicated structure to be processed, such as a bent pipe line.

  On the other hand, in the present embodiment, it is possible to increase the length of each of the injection paths 64A and 64B while suppressing the width W3 to be small and accelerate the projection material M to a suitable speed. Therefore, the blasting process can be favorably performed on the complicated structure to be processed.

  In addition, in the present embodiment, the projected injection paths 64A, 64A, in both the cross section (first two-dimensional plane) shown in FIG. 2 and the plane (second two-dimensional plane) shown in FIG. The axes X1A and X1B of 64B include curved portions. As a result, the lengths of the respective injection paths 64A, 64B can be made larger than in the case where the axes X1A, X1B include curved portions only on one of the two-dimensional planes, and the acceleration of the projection material M can be further promoted.

  Further, in this embodiment, each of the injection paths 64A and 64B has a spiral shape. In this case, since the projection material M and the fluid (compressed air in the present embodiment) smoothly change their traveling directions in the respective injection paths 64A, 64B, it is possible to suppress the pressure loss in the respective injection paths 64A, 64B. Furthermore, the two injection paths 64A and 64B can be efficiently arranged in the nozzle 6.

  Moreover, each of the spiral injection paths 64A and 64B becomes larger as the distance from the axis X1 becomes closer to the injection holes 62A and 62B. As a result, the curvature of each of the injection paths 64A, 64B becomes smaller at a position closer to the injection holes 62A, 62B, so that acceleration of the projection material M, which becomes faster as it approaches the injection holes 62A, 62B, is less likely to be hindered.

The injection holes 62A and 62B are provided at positions where their phases are shifted from each other about the axis X1. As a result, the projection material M is ejected from the ejection holes 62A and 62B in different directions, so that the blasting process can be made efficient.
In addition to the above, various suitable effects can be obtained from this embodiment.

[Second Embodiment]
The second embodiment will be described. The same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

  FIG. 5 is a schematic vertical sectional view along the axis X1 of the nozzle 160 according to the second embodiment. The nozzle 160 includes a rotating body 161 rotatable about an axis X1 (rotation axis), and a holder 162 connected to the hose 5 by the clamp 7. The rotating body 161 and the holder 162 have, for example, the outer shapes obtained by rotating the illustrated outer shapes around the axis X1.

  FIG. 6 is an external view of the nozzle 160 shown in FIG. In FIG. 6, the outer appearance of the rotating body 161 is shown in the region on the left side of the axis X1. Further, in FIG. 6, the appearance of the holder 162 is shown in the region on the right side of the axis X1.

  The rotating body 161 is a portion corresponding to the insertion portion 60 and the tip portion 61 in the first embodiment, and as shown in FIG. 5, a first injection hole 62A, a second injection hole 62B, an introduction path 63, and a first injection hole 63B. It has a first injection path 64A and a second injection path 64B. The introduction path 63 has a first portion 631 and a second portion 632.

  In the example of FIG. 5, the holder 162 has a cylindrical shape (hollow shape) in which the insertion portion 60 of the rotating body 161 is inserted. A gap is provided between the outer peripheral surface of the rotating body 161 and the inner peripheral surface of the holder 162. The holder 162 has a plurality of grooves 60a provided on the outer peripheral surface. Further, the holder 162 has an annular first convex portion P1 and a second convex portion P2 provided on the inner peripheral surface along the circumferential direction of the axis X1.

  The rotating body 161 has an annular first recess R1 and a second recess R2 provided on the outer peripheral surface along the circumferential direction of the axis X1. The first convex portion P1 is inserted into the first concave portion R1. The second convex portion P2 is inserted in the second concave portion R2. The tip of the first convex portion P1 is located closer to the axis X1 than the outer peripheral surface of the insertion portion 60 excluding the first concave portion R1. As a result, the rotating body 161 is prevented from coming off in the direction of the axis X1.

  In the example of FIG. 5, each of the convex portions P1 and P2 and the concave portions R1 and R2 is composed of two surfaces inclined with respect to the direction along the axis X1 and the radial direction about the axis X1. However, the shapes of the convex portions P1 and P2 and the concave portions R1 and R2 are not limited to this example.

  The convex portions P1 and P2 do not necessarily have to be annular. For example, a plurality of convex portions divided in the circumferential direction may be provided for each of the concave portions R1 and R2. Further, not only two convex portions and concave portions may be provided but more may be provided, or only one pair may be provided. Further, the convex portions P1 and P2 may be provided on the outer surface of the rotating body 161, and the concave portions R1 and R2 may be provided on the inner surface of the holder 162.

  The rotating body 161 has a plurality of first communication passages C1 and a plurality of second communication passages C2. These communication paths C1 and C2 connect the introduction path 63 with the gap formed between the outer peripheral surface of the rotating body 161 (insertion portion 60) and the inner peripheral surface of the holder 162.

  In the example of FIGS. 5 and 6, one end of the first communication passage C1 opens into the first recess R1 and the other end opens into the first portion 631. The second communication path C2 has one end opening to the second recess R2 and the other end opening to the second portion 632. The plurality of first communication passages C1 are provided at regular intervals in the circumferential direction. Similarly, the plurality of second communication paths C2 are provided at regular intervals in the circumferential direction.

  The axes of the communication paths C1 and C2 are, for example, linear. The axes of the communication passages C1 and C2 are inclined at an acute angle with respect to the axis X1 so that the opening of the inner peripheral surface of the rotating body 161 is located closer to the tip 61 side than the opening of the outer peripheral surface. This acute angle is 45 ° in one example, but may be another angle.

  In the above configuration, the rotating body 161 can rotate about the axis X1. As shown in FIGS. 2 and 4, the injection holes 62A and 62B are located at positions distant from the axis X1, and the axes X2A and X2B in the injection holes 62A and 62B are inclined with respect to the axis X1 and the radial direction RA, respectively. Imagine the case. In this case, the shot material M is jetted from the jet holes 62A and 62B so as to have a velocity component in the circumferential direction around the axis X1. The rotating body 161 rotates about the axis X1 by the reaction force (moment) at the time of this injection.

  The blast material M is jetted in a wide range around the nozzle 160 by the rotation of the rotating body 161 during jetting. Thereby, the entire inner surface of the structure to be processed can be blasted satisfactorily.

  Further, since it is not necessary for the operator to manually rotate the nozzle 160, the work efficiency is significantly improved. Since the reaction force at the time of jetting the projection material M is used, it is not necessary to provide a motor or the like for rotating the rotating body 161.

  It should be noted that foreign matter such as fragments of the projection material M may enter between the outer peripheral surface of the rotating body 161 and the inner peripheral surface of the holder 162. On the other hand, in this embodiment, since the communication passages C1 and C2 are provided, even if a foreign matter enters, it can be easily removed. For example, if a high pressure air is sent from the communication passages C1 and C2 to the above-mentioned gap by performing an idle operation in which only the fluid (for example, compressed air) is sent to the nozzle 160 without ejecting the shot material M, the foreign matter is removed. You can At this time, the injection holes 62A and 62B may be closed to increase the pressure inside the nozzle 160.

  When the communication passages C1 and C2 open to the recesses R1 and R2, respectively, the foreign matter that has entered the recesses R1 and R2 can be removed more accurately. Further, when the communication passages C1 and C2 are inclined with respect to the axis X1 as shown in FIG. 5, the projection material M during normal operation is unlikely to enter the communication passages C1 and C2.

  The nozzle 160 according to this embodiment can be manufactured by, for example, a metal 3D printer. In this case, the rotating body 161 and the holder 162 can be formed simultaneously. On the other hand, when the rotating body 161 and the holder 162 are separately formed, it is necessary to devise a method for inserting the rotating body 161 into the holder 162, which requires time and cost for manufacturing.

  The first and second embodiments described above do not limit the scope of the present invention to the configurations disclosed in the respective embodiments. The present invention can be implemented by modifying the configuration disclosed in each embodiment into various aspects.

  For example, in each of the above-described embodiments, the case where the nozzle 6 has two injection paths 64A and 64B has been illustrated. However, the nozzle 6 may be provided with only one ejection path, or may be provided with three or more ejection paths. Further, the shape of the injection path is not limited to the spiral shape as long as its axis includes a three-dimensional curved portion.

  DESCRIPTION OF SYMBOLS 1 ... Blasting device, 2 ... Compressor, 3 ... Supplying device, 4 ... Joint pipe, 5 ... Hose, 6,160 ... Nozzle, 7 ... Clamp, 62A, 62B ... Injection hole, 63 ... Introduction path, 64A, 64B ... Injection path, 65A, 65B ... Opening, 161 ... Rotating body, 162 holder, X1 ... Introducing path (nozzle) axis, X2A, X2B ... Injecting path axis, M ... Projection material.

Claims (11)

A nozzle for ejecting projection material,
An introduction path of the projection material,
An injection hole of the shot material,
An injection path connecting the introduction path and the injection hole,
The axis of the jetting path includes a curved portion both when projected onto a first two-dimensional plane and when projected onto a second two-dimensional plane orthogonal to the first two-dimensional plane.
nozzle. The axis of the injection path is inclined at an angle of 30 ° or more and 60 ° or less with respect to the axis of the introduction path in the injection hole.
The nozzle according to claim 1. At least a part of the injection path has a spiral shape,
The nozzle according to claim 1 or 2. At least a part of the injection path has a spiral shape in which the distance from the axis of the introduction path increases as the distance from the injection hole increases.
The nozzle according to claim 3. A pair of the injection holes,
A pair of the injection paths that respectively connect the introduction path and a pair of the injection holes,
At least a part of the pair of injection paths constitutes a double spiral,
The nozzle according to claim 3 or 4. The pair of injection holes are both displaced from the axis of the introduction path, and are provided at positions where the phases centered on the axis of the introduction path are displaced from each other.
The nozzle according to claim 5. A rotating body including the introduction path, the injection hole, and the injection path;
Further comprising a holder for rotatably holding the rotating body,
The injection hole is located at a position distant from the rotation axis of the rotating body, and injects the projection material so as to have a velocity component in the circumferential direction around the rotation axis,
The rotating body rotates by a reaction force when the projection material is ejected from the ejection hole,
The nozzle according to any one of claims 1 to 6. A nozzle for ejecting projection material,
A rotating body,
A holder for rotatably holding the rotating body,
The rotating body is
An introduction path of the projection material,
An injection hole of the shot material,
An injection path connecting the introduction path and the injection hole,
The injection hole is located at a position deviated from the rotation axis of the rotating body, and ejects the projection material so as to have a velocity component in the circumferential direction around the rotation axis,
The rotating body rotates by a reaction force when the projection material is ejected from the ejection hole,
nozzle. The holder has a hollow shape in which the rotating body is inserted,
One of the inner surface of the holder and the outer surface of the rotating body has an annular recess along the circumferential direction,
The other of the inner surface of the holder and the outer surface of the rotating body has a convex portion inserted into the concave portion,
The convex portion and the concave portion prevent the rotating body from coming off in the direction of the rotating shaft,
The nozzle according to claim 8. The rotating body further includes a communication passage that communicates the gap formed between the outer surface of the rotating body and the inner surface of the holder with the introduction passage.
The nozzle according to claim 9. A nozzle according to any one of claims 1 to 10,
A supply device for supplying the projection material to the nozzle,
Blasting device equipped with.

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