JPS5827067B2 - shot projection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shot projection device for polishing the inner surface of a box, and more specifically, the present invention relates to a shot projection device for polishing the inner surface of a box, and more specifically, the present invention relates to a shot projection device for polishing the inner surface of a box, and more specifically, it has a rotating disk with projection blades that is attached to a vertical rotation shaft and rotates in a horizontal plane. This invention relates to a novel projection device that can project a portion of the image diagonally upward.

As a method of cleaning the inner surface of a box such as a casting mold frame or a container, a vertical shot projecting device that can project shot horizontally and circumferentially using centrifugal force is inserted into the top opening of the box. A method is adopted in which the top surface of the box is sealed and shots are supplied from the outside and projected onto the inner surface of the box.

Various types of shot projection devices have been proposed for this purpose, but it has been difficult to clean the inner upper surface of the box with the conventional vertical projection devices.

This is because conventional devices were designed to only project shots horizontally, but not upwards.

In view of the above circumstances, the present inventor developed a shot projection device that is easy to use for cleaning boxes and can project shots not only horizontally like conventional devices but also diagonally upward. As a result of intensive research into manufacturing the product, the present invention was finally completed.

That is, the projection device of the present invention includes a vertical rotating shaft that can rotate at high speed, a shot guide path that is provided to surround the rotating shaft and has an annular cross section for dropping the shot downward, and is attached to the lower end of the rotating shaft, A rotating disk for receiving shots falling from the lower end of the shot guide path, and a plate-shaped projection blade that is mounted radially on the outer circumference of the disk from a vertically projected portion of the shot guide path onto the disk. , which is a sloped body provided at the peripheral edge of the disc, the upper surface of which is higher toward the outer periphery than the inner periphery.

The present invention will be explained in detail below based on the drawings.

That is, FIG. 1 is a partial vertical sectional view showing a specific example of the projection device of the present invention, and FIG. 2 is a horizontal sectional view taken along the line A-A' in FIG.

In the figure, 1 is a vertical rotating shaft driven by an electric motor (not shown), and a rotating disk 2 is attached to the lower end of the vertical rotating shaft.

The rotating shaft 1 is connected to the inner tube 6 of the double hollow tube 5 by bearing devices 3 and 4.
The inner tube 6 and outer tube 7 of the double hollow tube 5 are supported by a stay 8 to form a shot guide path 9 having an annular cross section, and a shot reservoir provided separately above the tube. Supply piping 10 for supplying more shots
is connected.

Eight projection blades 11 are radially mounted on the rotating disk 2 at the outer periphery of the vertically projected portion of the shot guide path 9 onto the rotating disk 2.

Furthermore, an inclined body 12 is attached to the peripheral edge of the rotating disk 2, the upper surface of which is higher toward the outer circumference than the inner circumference.

A method for cleaning the inner surface of a box using this device will be described below.

That is, the portion of the projection device including the rotating disk 2 is inserted into the case through the opening 14 of the case 13 that requires cleaning, and the projection device is placed on the case 13 by the support plate 15 attached to the projection device. Installed stably.

Shot is supplied onto the rotating disk 2 in this state from the shot reservoir via the supply pipe 10 and the shot guide path 9, and the shot travels horizontally on the projection blade 11 toward the outer circumference while being applied with centrifugal force by the projection blade 11. It is scooped up by the inclined body 12,
As shown by arrow B, it is projected diagonally upward on all four sides.

That is, with this device, the inner upper surface of the box 13, the upper side wall, etc., which are difficult to clean with a general vertical projection device, can be efficiently cleaned.

In the projection device of the present invention, the structures of the rotating disk, projection blades, and oblique body that perform the function of centrifugally projecting shots are not limited to those shown in the drawings.

For example, if the angle α between the top surface of the tilting body and the horizontal plane becomes large, it will be possible to project the shot more diagonally upward from the horizontal circumferential direction, but if it approaches 9cr, it will stop the shot from being projected, and vice versa. If this angle is close to 0 degrees, the shot will be projected mostly in the horizontal circumferential direction.

In the device of the present invention, this angle α can be appropriately selected from a range of 0 degrees to about 45 degrees based on the above-mentioned purpose.

Alternatively, it is preferable from the viewpoint of performance to make the upper surface of the inclined body not a straight line, but to make the slope curved as shown in the partial longitudinal cross-sectional view of Fig. 3, and to select the angle d within a range equal to the angle α. be.

That is, the shot supplied from above advances horizontally due to the centrifugal force of the projection blade 11a attached to the disc 2a, and is smoothly projected obliquely upward without colliding with the slope of the inclined body 12a.

Note that it is also preferable to configure the inclined body with various angles, rather than having a constant angle, in order to achieve the purpose of the present invention.

FIG. 4 shows a specific example of how the tilting body is attached to the rotating disk.

4A is a plan view, the opening in FIG. 4 is a front view of FIG. 4A, and the hull in FIG. 4 is a partial vertical sectional view.

In the drawing, eight projection blades 11' are attached to the rotating disk τ, and α1 . α
2. Inclined bodies a, b, and c having an inclination angle of α3 are attached, and the angle is, for example, α1=300. α2=200.
α3-10°, and no inclined body is attached to the d portion.

If you use a rotating disk like this, the shot will follow the arrows C and D.
It will be projected over a wide area.

Furthermore, from the viewpoint of production, it is preferable for the projection blade to have the flat plate 11 mounted radially and vertically on the rotating disk 2 as shown in FIGS. 1 and 2. However, in order to achieve the purpose of the present invention, Other attachment methods may also be used.

Figures 5 to 5 show how the projection blades are attached to such a rotating disk.
It is shown in FIG.

That is, FIG. 5 is a plan view showing a rotating disk equipped with a projection blade and a tilting body, in which the projection blade 21 is shifted by a certain angle β with respect to the radial direction of the disk 22 and is moved approximately radially toward the disk 22. The inclined body 32 is attached to the peripheral edge of the disk between the two.

Mounting the projection blade in such a state has the effect of increasing the centrifugal force applied to the shot, and is preferable in achieving the purpose of the present invention.

If the angle β is not controlled to be within about 30°, the shot may not be projected in the circumferential direction, making it difficult to achieve the purpose of cleaning.

FIG. 6A is a plan view showing still another aspect of mounting the projection blade, and the opening in FIG. 6 is a front view of FIG. 6A.

In this case, the projection blade 21' is tilted backward by an angle δ in the direction of rotation of the disc shown by the arrow with respect to a line perpendicular to the disc, and a tilting body 32' is attached to the peripheral edge of the disc between them. It is being

The projection blade mounted in such a state has the effect of projecting shots diagonally upward by itself, which is preferable in achieving the purpose of the present invention.

If this angle δ is not limited to within 30 degrees, but preferably within 20 degrees, the centrifugal force applied to the shot may be weakened and the cleaning ability may be degraded, making it difficult to achieve the purpose of cleaning.

FIG. 7A is a plan view showing another embodiment in which the projection blade is mounted on a disc, and the opening in FIG. 7 is a front view of FIG. 7A.

In this case, it is a combination of the embodiments shown in FIGS. 5 and 6, and the projection blades are attached to the disk at angles β and δ. Preferable in achieving the purpose.

However, the angles β and δ are as described above.

As explained in detail above, although the device of the present invention is a vertical projection device, it has a structure that allows shots to be projected diagonally upward. The top part of the side wall can be easily cleaned.

In the case of a conventional vertical projection device, the shot is simply projected horizontally, so if you want to clean the inside top wall or the top of the side wall as described above, you have to tilt the projection device and It must be pivoted around a central axis.

In order to do this, the projection device must have a plurality of structures capable of tilting and turning, and the sealing device for the upper opening of the case must also have a plurality of structures, which is not easy to operate.

On the other hand, the device of the present invention is much simpler in structure and operation as it simply needs to be inserted vertically into the box and ejects a shot.

That is, the apparatus of the present invention is considered to be extremely practical for cleaning the inner surface of a box having an opening at the top.

[Brief explanation of the drawing]

FIG. 1 is a partial vertical cross-sectional view showing a specific example of the apparatus of the present invention, and FIG. 2 is a horizontal cross-sectional view taken along the line A-A' in FIG. FIGS. 3 to 7 are diagrams showing other specific examples of the main parts of the apparatus of the present invention. 1, 1'... Vertical rotation axis, 2, 2a, 2', 22'
. 27... Rotating disk, 9... Shot supply path, 11°11a, 11', 21', 2γi., Projection blade, 12.
12a. 32.32'... Inclined body, 13... Box.

Claims (1)

[Claims] 1. A vertical rotation shaft capable of high-speed rotation, a shot guide path provided to surround the rotation shaft and having an annular cross section for causing the shot to fall downward, and attached to the lower end of the rotation shaft, the lower end of the shot guide path. A rotating disk for receiving falling shots, a plurality of plate-shaped projection blades mounted radially on the outer circumferential disk rather than a vertically projected portion of the shot guide path onto the disk, and the disk. A shot projection device comprising an inclined body whose upper surface is higher toward the outer periphery than the inner periphery.