JP2003275963A - Centrifugal blast wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a centrifugal blast wheel that is easy and simple to manufacture and assembly and efficiently blasts blast media. <P>SOLUTION: The centrifugal blast wheel defines a plurality of blast tunnels by a grooved disk 6 whose inner surface has a plurality of blast grooves 7, and a wheel cover 10 mounted to cover the blast grooves in the grooved disk. The blast grooves are a radially arranged curved state, and are a continuous groove with a central groove width wider than a peripheral end groove width across the centrifugal blast wheel 9 and without steps along groove wall surfaces. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for blasting a light-weight projection material having a low specific gravity such as dry ice pellets, glass beads or alundum, and a projection material having a high specific gravity other than the above, for performing blasting on an object. It relates to a suitable centrifugal projection wheel.

[0002]

2. Description of the Related Art Conventionally, there has been no special wheel for centrifugally projecting a lightweight projection material such as dry ice pellets having a low specific gravity. Therefore, as a wheel for centrifugal projection, a wheel similar to the projection wheel for shot steel balls is used.
In general, a wheel, that is, a wheel in which 6 to 8 blades are radially assembled between two discs is used. Further, in both a centrifugal projection wheel that projects a shot of a steel ball and a wheel that projects 50 kg / min or less, a wheel in which 6 to 8 blades are radially assembled between two discs as described above. Is commonly used.

[0003]

A wheel for radially assembling 6 to 8 blades between two discs as described above is an assembling work in a narrow place, and is a blade for radially assembling. It is a troublesome and time-consuming assembly work because it is necessary to balance the work. Further, when a lightweight shot material or a shot of a small-capacity steel ball is centrifugally projected by the wheel as described above, there is a problem that the projected material is not dispersed and concentrated and the projection efficiency is poor.

The present invention has been made in view of the above problems. An object of the present invention is to provide a centrifugal projection wheel which is simple and easy to manufacture and assemble, and which is a lightweight projection material or a shot of a small-capacity steel ball.

[0005]

To achieve the above object, a centrifugal projection wheel according to the present invention comprises a grooved disk having a plurality of projection grooves formed on the inner surface of the disk, and the grooved disk. A plurality of projection tunnels are configured by the wheel cover attached so as to cover the upper surface of the projection groove. Further, the projection grooves are radially arranged and curved, and the center projection groove width of the centrifugal projection wheel is wider than the outer peripheral end groove width and is a continuous groove having no step on the groove wall surface. In addition, a plurality of holes that do not communicate with the projection tunnel are provided in at least one of the grooved disk and the wheel cover, and in addition, at least one of the plurality of holes has a centrifugal projection wheel. A grooved disc and / or wheel with a plurality of radial projection grooves formed on the inner surface of the disc.
It is characterized in that the lube is manufactured by machining or casting, or that the surface thereof is heat-treated or coated after the manufacture. Further, as a projection material having a specific gravity of 4 or less, the material of the grooved disk and the wheel cover is light alloy or ceramics, and the surface thereof is coated. It is a feature.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is an exploded view of a centrifugal projection device for a projection material according to the present invention. The motor 1 has its rotating shaft 2 rotatable and only the rotating shaft 2 penetrates the case 3 and is fixed to the outer surface of the case. A centrifugal projection wheel 9 is fixed to the tip of the rotary shaft 2. An inverted U-shaped liner-3A is integrally connected to the front surface of the case 3.

The centrifugal projection wheel 9 is composed of a grooved disk 6 and a wheel cover 10. The grooved disk 6 has a plurality of radial projection grooves 7 formed on the inner surface of the disk. The grooved disc 6 is fastened to the rotary shaft 2 of the motor 1 with a bolt 8 via a bracket 5. Further, the wheel cover 10 is attached to the front surface (grooved surface) of the grooved disk 6 by bolting so as to cover the projection groove 7, and the projection groove 7 is formed in a tunnel shape to form the grooved disk 6. A projection wheel 9 is constituted by the wheel cover 10.

The grooved disc 6 having a plurality of radial projection grooves 7 formed on the inner surface of the disc is manufactured by machining after casting or machining from a plate material. The grooved disk 6 having a plurality of radial projection grooves 7 formed on the inner surface of the disk, and the wheel cover 10 attached so as to cover the upper surface of the projection groove 7 of the grooved disk 6 are cast. The centrifugal projection wheel 9 may be integrally formed by In order to prolong the service life of the grooved disc 6 and the wheel cover 10, the entire surface or a local surface thereof may be subjected to heat treatment, metal spraying, plating or the like. With this structure, it can be manufactured and assembled more easily and easily than the conventional centrifugal projection wheel. Furthermore, the weight of the centrifugal projection wheel 9 can be reduced by using a light alloy for the material of the grooved disk 6 and the wheel cover 10. In this case, the surfaces of the grooved disk 6 and the wheel cover 10 are wholly or locally heat-treated or metal-sprayed,
The durability of the centrifugal projection wheel 9 can be increased by applying a coating process such as plating.

On the outer side of the centrifugal projection wheel 9, a case cover 11 corresponding to the case 3 and having a through hole 11A in the center is brought into contact with the liner 3A so as to have a constant interval. It is opened and bolted. That is, the centrifugal projection wheel 9 is rotatably (connected to the rotating shaft 2 of the motor 1) housed in the case 3 with liner 3A and the case cover 11.

Further, an inverted T-shaped pellet introduction cylinder 1 is attached to the casing cover 11 at the center of the centrifugal projection wheel 9.
A guide tube 12 of No. 3 is held via a cover member 14 so that the mounting angle can be adjusted. In addition, the guide tube 12 penetrates the through hole 11A of the case cover 11 and the wheel cover 10,
Further, it is fixed to one end of an inverted T-shaped pellet introduction cylinder 13 so as to face the grooved disk 6. In addition, the guide cylinder 12 has a pellet ejection port 12A formed in its peripheral body portion. The pellet ejection port 12A may have a rectangular shape, an inverted triangle shape, a semicircular shape, or any other desired shape, but it is sufficient to select a shape suitable for each shot material by an experimental test.

Further, the other end of the pellet introducing cylinder 13 is attached so that a cover member 14 having an opening 14A communicating with a heating and compression air source (not shown) is closed. A pipe 15 for supplying a shot material is connected to the vertical passage of the pellet introduction cylinder 13.

The projection groove 7 of the grooved disk 6 is curved and radial as shown in FIGS. 1 and 2A and 2B.
As shown in FIG. 2C, at least a part may be linear and radial, and the projection groove 7 may be formed as shown in FIGS.
As shown in (c), the groove width on the center side of the centrifugal projection wheel 9 is preferably wider than the groove width on the outer peripheral side end, and the groove wall surface is preferably a continuous groove having no step. This is for facilitating the flow of the projection material and ensuring the concentration of the projection. In addition,
According to the embodiment, if the groove width on the center side of the centrifugal projection wheel 9 is made wider than the groove width of the pellet ejection port 12A, the shot material flowing out from the pellet ejection port 12A can be easily received. It has been found that with this configuration, the efficiency of collecting the shot material in each of the projection grooves 7 increases, and decreases when the projection material is narrowed. The projection groove 7 having the same dimensional ratio of the groove width and the groove depth or exceeding 1, or smaller than 1 is provided for adjusting and securing the projection amount and the projection range. For example, when a large amount of shot material is projected onto a narrow portion of the material to be processed, a certain width of the groove is required, which is calculated from the speed at which the shot material passes through the groove. In this case, the dimensional ratio of groove width and groove depth is generally the same or smaller than 1.

In addition, the front grooved disk 6 and the wheel cover-1
0, at least one or both of the holes 6A, 6A (wheel cover-1) not communicating with the projection tunnel.
The hole on the 0 side is not shown), and the hole 6
At least one of A and A may be filled with a material different from the material of the centrifugal projection wheel 9 to balance the centrifugal projection wheel 9. The hole 6A may be a circle (FIG. 2B), an ellipse (FIG. 2C), a quadrangle (not shown), or another polygon. Since the conventional centrifugal projection wheel balance correction is generally performed by grinding the outer peripheral portion of the wheel with a grinder or the like, there is a problem that the life of the projection wheel itself is shortened. According to the present invention, balance correction can be easily performed.

With the above-mentioned structure, the blast treatment is performed while moving the object to be treated by adjusting the position angle of the pellet ejection port 12A of the guide tube 12 according to the object to be treated, or the above apparatus. One of the two methods is to use a hand-held type and carry out blasting while moving it along the object to be processed. Next, the operation of the above device will be described.
The centrifugal projection wheel is operated via the rotary shaft 2 by operating the motor 1.
Rotate le 9 at high speed. Next, atmospheric air or hot air compression air is continuously supplied into the pellet introduction cylinder 13 through the opening 14A, and at the same time, the projection material is supplied from the pipe 15.

As a result, the projection material is forcibly introduced into the guide cylinder 12, ejected from the pellet ejection port 12A, guided to the tunnel-shaped projection groove 7 of the centrifugal projection wheel 9, and subjected to the centrifugal projection action. It is projected from the tip. At this time, since the center of the projection groove 7 is wide and the distance the projection material moves from the pipe 15 for supplying the projection material to the projection groove 7 is short, the injection pipe like the pressure injection method is used. There is no fear of clogging of the shot material due to the small diameter or nozzle diameter and the long piping path. Further, since the projectile is not subjected to a mechanism for forcibly stirring it in the central portion of the centrifugal wheel and supplying it to the projection groove as in the conventional case, there is no fear of damage.
It is particularly suitable for a crushable dry ice pellet, a shot material containing a resin or a plant as a main raw material. In addition,
The specific gravity of these is often 4 or less, and even if the specific gravity is greater than 4, it is suitable for projecting a small-capacity steel ball shot. For example, the projection wheel of the present invention is particularly suitable for projections of 50 kg / min or less. This is because there is no need to worry about clogging of the projection material.

[0016]

As is apparent from the above description, the present invention is provided with a grooved disc having a plurality of projection grooves formed on the inner surface of the disc, and is mounted so as to cover the upper surface of the projection groove of the grooved disc. And a plurality of projection tunnels are formed by the wheel cover, and the projection grooves are radially arranged and curved, and the center side groove width of the centrifugal projection wheel is larger than the outer peripheral side end groove width. The groove is wide and has no step on the wall surface of the groove, and at least one of the grooved disk and the wheel cover is provided with a plurality of holes that do not communicate with the projection tunnel. In addition, at least one of the plurality of holes is filled with a material different from the material of the centrifugal projection wheel, and further, a grooved disk having a plurality of radial projection grooves formed on the inner surface of the disk and / or Wheel cover machined or cast Be manufactured, if necessary, heat treatment or coating on the surface can extend the life, and if necessary, the grooved disk and the wheel cover are made of a light alloy, and the surface is coated. The manufacturing and assembling of the wheel are simple and easy due to the coating treatment, and the manufacturing cost can be greatly reduced. Further, there are various effects such as efficiently projecting the projectile, and further reducing the weight and simplifying the structure of the centrifugal projection wheel.

[Brief description of drawings]

FIG. 1 is an exploded view of a projection device for dry ice pellets and the like.

FIG. 2 is a plan view showing various examples of grooved discs.

[Explanation of symbols]

1 motor 2 rotation axes 3 cases 3A Reverse U-shaped liner 5 bracket 6 grooved disc 7 Projection groove 8 volt 9 Centrifugal projection wheel 10 Wheel Cover 11 cases 11A through hole 12 induction tube 12A pellet jet 13 Pellet introduction tube 14 Cover member 14A opening 15 pipes

Claims (17)

[Claims] 1. A grooved disk 6 having a plurality of projection grooves 7 formed on the inner surface of the disk, and a wheel cover 10 mounted so as to cover the upper surface of the projection groove 7 of the grooved disk 6. Centrifugal projection wheel characterized in that a plurality of projection tunnels are constructed by
Le. 2. The centrifugal projection wheel according to claim 1, wherein the projection grooves 7 are arranged radially and are curved. 3. The projection groove 7 is formed as a continuous groove in which the center side groove width of the centrifugal projection wheel 9 is wider than the outer peripheral side end groove width and there is no step on the groove wall surface. The centrifugal projection wheel according to claim 1 or 2. 4. The centrifugal projection wheel according to any one of claims 1 to 3, wherein at least a part of the projection groove 7 is linear. 5. The grooved disc 6 and wheel cover 10
2. A plurality of holes 7A, 7A which do not communicate with the projection tunnel are provided in at least one of the above.
5. The centrifugal projection wheel according to claim 4. 6. The grooved disc 6 and wheel cover 10
A plurality of holes 7 that penetrate through and do not communicate with the projection tunnel.
The centrifugal projection wheel according to any one of claims 1 to 4, wherein A and 7A are provided. 7. The plurality of holes 7A, 7A are circular, elliptical, quadrangular or polygonal.
Alternatively, the centrifugal projection wheel according to claim 6. 8. At least one of the plurality of holes 7A, 7A
The centrifugal projection wheel according to any one of claims 5 to 7, wherein the centrifugal projection wheel is filled with a material different from the material of the centrifugal projection wheel. 9. The grooved disk 6 having a plurality of radial projection grooves 7 formed on the inner surface of the disk is manufactured by machining, and the grooved disk 6 is manufactured by machining. Centrifugal projection wheel. 10. The grooved disk 6 having a plurality of radial projection grooves 7 formed on the inner surface of the disk is manufactured by casting. Centrifugal projection wheel. 11. A disk with groove 6 having a plurality of radial projection grooves 7 formed on the inner surface of the disk, and a wheel cover 10 covering the upper surface of the projection groove 7 of the disk with groove 6 by casting. The centrifugal projection wheel according to any one of claims 1 to 8, which is manufactured integrally. 12. A grooved disk 6 having a plurality of radial projection grooves 7 bored on the inner surface of the disk is manufactured by machining or casting, and is further heat treated entirely or locally. The centrifugal projection wheel according to any one of claims 1 to 11. 13. A grooved disk 6 having a plurality of projection grooves 7 formed radially on the inner surface of the disk and having a dimensional ratio of groove width and groove depth equal to or greater than 1, or smaller than 1. 13. The centrifugal projection wheel according to any one of claims 1 to 12, which is manufactured by casting and further heat-treated. 14. The grooved circular plate 6 and the wheel cover-1.
The centrifugal projection wheel according to any one of claims 1 to 13, wherein the material of No. 0 is light alloy or ceramics. 15. The grooved circular plate 6 and the wheel cover-1.
12. The centrifugal projection wheel according to claim 11, wherein the surface of No. 0 is coated. 16. The centrifugal projection wheel according to claim 1, wherein the projection material projected by the centrifugal projection wheel has a true specific gravity of 4 or less.
Le. 17. The centrifugal projection wheel according to claim 1, wherein the true specific gravity of the projection material projected by the projection wheel is heavier than 4. -Le.