JPH0230219Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an impeller blade for a centrifugal projection device.

(Prior art) When a strip-shaped product is polished using a centrifugal projection device while moving in the longitudinal direction, the rotation direction of a rotating body (hereinafter referred to as an impeller) for centrifugally projecting the abrasive material is usually set in the longitudinal direction of the product. However, if the width of the product is narrow, the projection efficiency (ratio of the total projection amount that hits the product) is poor and energy is wasted. In order to increase the projection efficiency, it is preferable to make the rotation direction of the impeller parallel to the longitudinal direction of the product, but the impeller's projection area in this direction is extremely narrow and often cannot accommodate changes in the width dimension of the product.

Conventionally, as a method of expanding the projection area in the rotational direction of the impeller, it has been proposed to narrow the base end width and widen the distal end width of the impeller blade, and to make the cross section V-shaped or circular arc-shaped (for example, Publication number 52-46754). However, such an impeller blade cannot be attached to the impeller side plate of a normal centrifugal projection device, and the device has the disadvantage of requiring special specifications and being expensive.

(Purpose of the invention) The present invention was made in view of the above circumstances, and is an impeller blade that can expand the projection area in the rotational direction of the impeller and can be attached to the impeller side plate of a normal centrifugal projection device. We aim to provide the following.

(Structure of the invention) Hereinafter, the present invention will be explained in detail based on an embodiment. Fig. 4 shows a centrifugal projection device in which two discs 1 are spaced apart from each other and are arranged facing each other, each having a center hole of the same diameter. , 1 is fastened to a rotating flange 3, and a boss portion of the rotating flange 3 is fixed to a rotating shaft 4. A centering plate 6 for holding a distributor 5 is fitted into a center hole on the left side of the impeller side plate 2 when viewed from the drawing, and is fixed to one end of the rotating shaft 4. Note that 7 is a rotation prevention pin. The base of a centering bolt (not shown) passing through the center of each of the distributor 5 and centering plate 6 is fixed to the center of one end of the rotating shaft 4, and a centering nut 8 is attached to the tip of the bolt. The distributor 5 is fixed to the centering plate 6 by screwing and tightening. Reference numeral 9 denotes a control cage whose base is mounted on the side of a shot introduction cylinder (not shown) and inserted into the gap between the center hole of the impeller side plate 2 and the outer periphery of the distributor 5.

A plurality of radial fitting grooves 11, 11 are formed in pairs on the opposing inner surfaces of the disks 1, 1 in the impeller side plate 2.

One of the impeller blades according to the present invention (hereinafter referred to as the first deflection blade) 12 is inserted into one of the fitting grooves 11, 11 through ribs 14, 15 formed at both ends of the blade main body 13. It is inserted and fitted. The structure of the first deflection blade 12 will be explained based on FIGS. 1 to 3. The rib 1
4 and 15, the inner edge of the rib 15 on the left side (hereinafter referred to as a straight rib) in FIG. The inner edge of the tapered rib (referred to as a tapered rib) 14 forms a taper that widens from the base end to the tip end of the blade 12.

Note that the taper angle α of the inner edge of the taper rib 14 is 2
It is arbitrarily determined within the range of ~15°. The surface of the blade main body 13 is sloped downward from the straight rib 15 side to the tapered rib 14 side. That is, it is deflected outward by a predetermined angle with respect to the rotational direction of the impeller side plate 2 (see FIG. 5). Incidentally, the inclination angle β of the surface of the blade main body 13 is also arbitrarily determined within the range of 2 to 15 degrees. Semicircular grooves 16, 16 are formed approximately in the center of each of the ribs 14, 15 on the back surface of the first deflection blade 12.
are carved to face each other, and holes are drilled at symmetrical positions on both sides of the fitting grooves 11, 11 of the impeller side plate 2 through the cut grooves 16, 16 on both sides of the stop spring 17. 18, 18, the first deflection blade 12 connects to the impeller side plate 2.
(See Figure 5). The impeller blade (hereinafter referred to as straight blade) has ribs 21, 21 whose inner edges are straight at both ends of the blade main body 19 in the fitting grooves 11, 11 adjacent to the first deflection blade 12 of the impeller side plate 2. ) 22 is inserted and fitted through the ribs 21, 21. The surface of the blade main body 19 of the straight blade 22 faces directly in the direction of rotation of the impeller side plate 2 (see FIG. 6). The straight blade 22 is also fixed to the impeller side plate 2 by a stop spring 17 in the same manner as the first deflection blade 12.

In the fitting grooves 11, 11 adjacent to the straight blades 22 of the impeller side plate 2, another one of the impeller blades (hereinafter, a second
(referred to as a deflection blade) 23 is the blade main body 24
It is inserted and fitted through ribs 25 and 26 formed on both side ends of. As shown in FIG. 7, the second deflection blade 23 has a bilaterally symmetrical shape with respect to the first deflection blade 12. That is, the rib 25,
Of the 26, the rib on the left side in Figure 7 (hereinafter referred to as
The inner edge of the straight rib 25 (hereinafter referred to as a straight rib) is straight, and the inner edge of the right rib (hereinafter referred to as a taper rib) 26 is tapered to widen from the base end to the tip end of the blade 23. The surface of the blade main body 24 has the straight rib 2
It is inclined downward from the 5 side to the taper rib 26 side.
That is, it is deflected inward at a predetermined angle with respect to the rotational direction of the impeller side plate 2.

Incidentally, the taper angle of the inner edge of the tapered rib 26 and the inclination angle of the surface of the blade main body 24 in the second deflection blade 23 are also arbitrarily determined within the range of 2 to 15 degrees, as in the case of the first deflection blade 12. The second deflection blade 23 also has a stop spring 17.
It is fixed to the impeller side plate 2 in the same way as the first deflection blade 12 and the straight blade 22.

the second deflection blade 2 of the impeller side plate 2;
The same straight blade 22 as described above is inserted and fixed into the fitting grooves 11, 11 adjacent to the fitting grooves 3. That is, the first deflection blades 12 and the second deflection blades 23 are arranged alternately with the straight blades 22 in between.

The same number of the three types of impeller blades are attached to the impeller side plate 2, and all have the same mass so as not to upset the rotational balance of the impeller side plate 2.

(Function) In the centrifugal projection device configured as described above, the impeller side plate 2, the centering plate 6, and the distributor 5 are rotated via the rotating shaft 4, and then a shot (not shown) is introduced into the distributor 5. When the shot is supplied through the tube, the shot is supplied to the impeller blade through the opening of the distributor 5 and the control cage 9, and is projected onto the object to be processed by the rotational centrifugal force of the blade. At this time, the shot supplied to the first deflection blade 12 is guided by the deflection surface of the blade 12 and the tapered rib 14, and is diffused and projected outward with respect to the rotational direction of the impeller side plate 2, and is projected at a predetermined interval. The surface of the object to be processed is polished with a density distribution as shown by line A in FIG.

Further, the shot supplied to the straight blade 22 is projected along the rotational direction of the impeller side plate 2, and the surface of the object to be processed is polished with a density distribution as shown by line B in FIG. Furthermore, the shot supplied to the second deflection blade 23 is
3 and the tapered rib 26, and is projected while being diffused inward with respect to the rotational direction of the impeller side plate 2, and the surface of the object to be processed is
Polishes with a line-like density distribution. and these 3
By combining the two density distributions, a projection area with a wide width and substantially uniform density distribution can be obtained, as shown by line D in FIG.

In the embodiment, the projection range is expanded by combining three types of blades, but the combination method is not limited to this. Further, in the embodiment, the surface inclination angle and the taper angle of the taper rib of the first deflection blade 12 and the second deflection blade 23 are made the same, but in order to obtain a projection area of the desired width, they are adjusted within the range of 2 to 15 degrees. It may be set separately.

(Effect of the invention) As is clear from the above description, the present invention provides an impeller blade for a centrifugal projection device, in which one of the ribs formed at both ends of the blade main body is connected to the base end and the tip of the blade main body. One side is formed into a straight rib that is straight, and the other side is formed into a tapered rib whose inner edge expands from the base end of the blade toward the tip, and the surface of the blade body is sloped downward from the straight rib side to the tapered rib side. It is.

After attaching such impeller blades symmetrically and alternately to the impeller side plates, when the impeller is rotated and a shot is projected, a wide shot is created parallel to the rotation direction of the impeller at a point a predetermined distance away from the impeller. A projection area with a large and uniform density can be obtained. As a result, when the belt-shaped product is moved in the longitudinal direction and the impeller rotation direction is parallel to the longitudinal direction of the product to be polished, it is possible to cope with slight variations in the width of the product. This greatly improves projection efficiency and prevents wastage of energy.

Furthermore, since the impeller blade of the present invention can be attached to a normal impeller side plate, there is no need to make the centrifugal projection device specially designed, and it can be implemented at low cost.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG.
A plan view of the deflection blade, Figure 2 is taken from A-A in Figure 1.
3 is a sectional view taken along line B-B in FIG. 1, FIG. 4 is a longitudinal sectional front view of the centrifugal projection device, and FIGS. 5 to 7 are views taken along C-C in FIG. 4. FIG. 5 shows how the first deflection blade is installed, FIG. 6 shows the straight blade, and FIG. 7 shows how the second deflection blade is installed. FIG. 8 shows the density distribution of the shot projected from the impeller on the surface to be treated. 2: impeller side plate, 12: first deflection blade,
13, 19, 24: Blade main body, 14, 26:
Taper rib, 15, 21, 25: Straight rib, 17: Stop spring, 22: Straight blade, 23: Second deflection blade, 2: Impeller side plate, 1, 1: Disc, 11, 11: Fitting recess.

Claims (1)

[Scope of utility model registration request] At one side end of the blade main bodies 13, 24, the outer edge can be inserted into the fitting recess 11 on the inner surface of one disk 1 in the impeller side plate 2, and the inner edge is the base end and tip of the blade main body 13, 24. Straight ribs 15, 25 that are straight against
At the same time, at the other side end part, the outer edge can be inserted into the fitting recess 11 on the inner surface of the other disk 1 in the impeller side plate 2, and the inner edge is formed from the base end to the tip of the blade main body 13, 24. Taper ribs 14 and 26 are formed that expand in a tapered shape toward the blade main body 13 and 24.
An impeller blade for a centrifugal projection device characterized by being inclined downward toward the 4 and 26 sides.