JPH08216024A - Shot blasting device - Google Patents

Abstract

PURPOSE: To enable an overall surface for machining to be blasted by raising and lowering or horizontally moving a grinding/polishing/cleaning material projecting unit along the surface of work to be machined, and either horizontally moving or raising and lowering the grinding/polishing/cleaning material projecting unit at the raised or lowered end or at the horizontally moved end so that the projected position moves in steps. CONSTITUTION: A grinding/polishing/cleaning material projecting unit C is raised or lowered, passes the upper or lower end of a retaining-wall concrete block W and, when reaching an upper masking means 1 or a lower masking means J, is stopped temporarily from rising or falling. Then a traverse truck 77 is moved horizontally so that a blasting position horizontally moves a predetermined amount in the cross direction of the retaining wall concrete block W, and then the grinding/polishing/cleaning material projecting unit C is raised or lowered again to start blasting. Such raising or lowering and horizontal movement of the grinding/polishing/cleaning material projecting unit C are repeated alternately so that the overall surface Wc of the retaining wall concrete block W is blasted thoroughly as predetermined.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shot blasting device for blasting the surface of a concrete molded product.

[0002]

2. Description of the Related Art Retaining wall construction is indispensable for civil engineering work such as large-scale residential land development. In this case, a concrete retaining wall block manufactured in advance from a factory is laid from the viewpoint of ease of construction. There is a tendency that the method to do is used a lot.

In this case, if the retaining wall block is considered to be its function, if the strength performance is satisfied, even if the surface is exposed to the outside and exposed to the public in the construction state, it remains the exposed surface of concrete. There is no problem even if you leave it.

However, in recent years, due to the increasing awareness of the preservation of the living environment, even in the civil engineering materials such as the retaining wall block, a design element is added to the surface exposed to the public in the construction state. There is a demand to integrate the retaining wall block into the surrounding environment.

As one method to meet such demands, makeup aggregates having various shades are mixed into concrete when the retaining wall block is manufactured, and the surface of the retaining wall block is blasted after the retaining wall block is manufactured. A method is conceivable in which the surface cosmetic aggregate is appropriately exposed on the surface of the retaining wall block to give the surface a design. Then, when blasting concrete molded products such as retaining wall blocks, it is preferable to use a mechanical blasting machine that projects the abrasive with the centrifugal force of the impeller rotated by a motor. It has been common in the past.

[0006]

However, since a concrete molded product such as a retaining wall block is generally large in size, its surface to be processed is also large. Therefore, it is necessary to work while sequentially moving the projection position of the abrasive. However, in such a case, if a conventional mechanical blasting machine is used, a relatively large blasting machine itself including a motor and the like needs to be moved as the work progresses, so the structure of the device is complicated. There is a problem that the size becomes large, and this problem becomes remarkable especially when a plurality of blast machines are provided in order to improve work efficiency.

On the other hand, from the viewpoint of making the quality of the product uniform, it is necessary to make the working degree of the work surface as uniform as possible over the entire area. In this case, the problem is the projection angle and the projection distance of the abrasive material to the work surface, which must be kept constant during the blasting of the work surface, and these must be maintained automatically. Although it is essential to do so, the current situation is that no effective technology has been proposed from this point of view.

In view of the above-mentioned conventional problems, the present invention is a shot blasting apparatus having a small size, a light weight, and a simple structure and capable of easily achieving a uniform degree of processing over the entire surface to be processed. It was made as an offer.

[0009]

In the present invention, the following constitution is adopted as a concrete means for solving such a problem.

In the first invention of the present application, the abrasive material is projected onto the substantially flat work surface Wc of the work W which is a concrete molded product to impart a proper chipping action to the surface layer of the work surface Wc. In the shot blasting apparatus, the work placing means F for placing and fixing the work W such that the surface Wc of the workpiece W extends along the vertical direction, and the granular polishing agent are mixed with the pressurized air. A polishing / cleaning material pressure feeding means A for pneumatically feeding the polishing / cleaning material and a polishing / cleaning material projection nozzle 18 for projecting the polishing / cleaning material pressure-fed by the polishing / cleaning material pressure feeding means A together with pressurized air onto the surface Wc to be processed of the work W Equipped with abrasive cleaning material projection unit B
And a projection unit supporting means for supporting the polishing / cleaning material projection unit B so that the polishing / cleaning material projection nozzle 18 always faces the surface to be processed Wc at a predetermined interval and maintains a projection direction orthogonal to this. C, a projection unit elevating means D for vertically moving the abrasive cleaning material projection unit B in the vertical direction along the surface Wc of the workpiece W, and the abrasive cleaning material projection unit B for attaching the workpiece W to the workpiece W. Processed surface Wc
And a projection unit traversing means E for traversing in the left-right direction along the plane direction.

According to a second invention of the present application, in the shot blasting apparatus according to the first invention, the projection unit supporting means D tilts the polishing / cleaning material projection unit C with respect to the axis of the polishing / cleaning material projection nozzle 18. A link mechanism 31 which is swingably supported in a direction in which the work is moved and is moved forward and backward by a driving force of an actuator 45 toward and away from the work W, and the polishing / cleaning material projection unit C by the link mechanism 31. Of the polishing / cleaning material projection nozzle 18 by contacting the work surface Wc of the work W with the forward movement of the workpiece W.
Is provided so as to be orthogonal to the surface Wc to be processed, and is provided with a guide means 33 for defining a distance between the abrasive cleaning projection nozzle 18 and the surface Wc to be processed to a predetermined dimension.

[0012]

According to the present invention, the following actions and effects can be obtained by adopting such a configuration.

In the shot blasting apparatus according to the first invention of the present application, the work surface Wc of the work mounting means F is
The polishing / cleaning material projection unit C supported by the projection unit supporting means D is mounted on the surface Wc of the workpiece W mounted and fixed such that the surface direction of the polishing / cleaning material is along the vertical direction. 18 is arranged so as to always face the surface to be machined Wc at a predetermined interval and maintain the projection direction orthogonal to this, and in this state, the polishing / cleaning material pressure-fed by the polishing / cleaning material pressure-feeding means A together with the pressurized air. The abrasive cleaning material projection nozzle 18 is projected toward the work surface Wc to blast the surface layer of the work surface Wc.

In this case, two work methods can be selected. One of them is a case where the projection of the abrasive cleaning material onto the work surface Wc by the abrasive cleaning material projection nozzle 18 is performed while the projection unit elevating means E drives the abrasive cleaning material projection unit C up and down. The projection unit traversing means F is operated after the completion of the elevation of the work surface Wc from the upper end to the lower end or from the lower end to the upper end, and the projection position of the abrasive material on the work surface is laterally shifted by a predetermined amount.
After that, the polishing / blasting material projection unit 18 is further raised and lowered while projecting the polishing / blasting material projection nozzle 18, and such an operation is sequentially repeated to blast the entire surface Wc to be processed. . On the contrary, in the other one, while the abrasive cleaning material projection nozzle 18 projects the abrasive cleaning material onto the surface Wc to be processed during the traverse driving of the abrasive cleaning material projection unit C by the projection unit traversing means F. In such a case, the projection unit elevating means E after completion of traversing from the left end to the right end or from the right end to the left end of the work surface Wc.
Is operated to shift the projection position of the abrasive cleaning material on the surface to be processed by a predetermined amount in the vertical direction, and then the abrasive cleaning material projection unit C is traversed while further projecting the abrasive cleaning material from the abrasive cleaning material projection nozzle 18. Then, by sequentially repeating this operation, the entire surface of the work surface Wc is blasted.

As described above, according to the shot blasting apparatus of the first invention of the present application, the abrasive cleaning material is projected from the abrasive cleaning material projecting nozzle 18 of the abrasive cleaning material projecting unit C together with the pressurized air. The material projection unit C is moved up and down along the surface Wc to be processed of the workpiece W, and the polishing and cleaning material projection unit C is moved horizontally or vertically at the elevating end or the traverse end to sequentially shift the projection position for processing. Surface W
Blasting can be performed on the entire surface of c, and blasting can be performed with high workability, which in turn can contribute to lowering the product cost.

Furthermore, since the polishing / cleaning material pneumatically fed from the polishing / cleaning material pressure-feeding means B is projected in the polishing / cleaning material projection nozzle 18 together with the pressurized air toward the surface to be processed, Only the polishing / cleaning material projection unit C provided with the above-mentioned polishing / cleaning material projection nozzle 18 may be moved up and down or traversed by the projection unit elevating means E and the projection unit traversing means F while the polishing / cleaning material pressure feeding means B is fixedly arranged. The driven part is smaller and lighter than, for example, the case where a conventional mechanical blast machine is used. As a result, the overall size and weight of the apparatus can be reduced, and the capacity of the driving means such as a motor can be reduced, and the work efficiency can be improved by increasing the number of mounted cleaning / cleaning material projection nozzles 18 and expanding the projection range. It's easy.

According to the shot blasting apparatus of the second invention of the present application, in addition to the above-described effects, the following unique effects can be obtained. That is, the projection unit supporting means D is the polishing / cleaning material projection unit C.
And a link mechanism 31 that swingably supports the abrasive cleaning material projection nozzle 18 in a direction in which the axis of the abrasive cleaning material projection nozzle 18 is tilted and that is moved forward and backward in a direction toward and away from the workpiece W by a driving force of an actuator 45. The abrasive cleaning projection nozzle 1 is brought into contact with the work surface Wc of the workpiece W as the abrasive cleaning projection unit C moves forward by the mechanism 31.
The link mechanism 31 is provided with the guide means 33 that regulates the distance between the abrasive cleaning material projection nozzle 18 and the processed surface Wc to a predetermined size in a state where 8 is orthogonal to the processed surface Wc. When the polishing / cleaning material projection unit C is moved forward toward the surface Wc to be processed, the guide means 33 comes into contact with the surface Wc to be processed and the nozzle 18 for cleaning / cleaning material is moved to the surface Wc to be processed. At the same time, they are made orthogonal to each other, and the distance between the abrasive cleaning material projection nozzle 18 and the surface Wc to be processed is defined to be a predetermined dimension.

Therefore, not only when the surface direction of the work surface Wc coincides with the vertical plane, but also when the surface Wc is inclined with respect to the vertical plane, or when the surface is slightly curved. Since the abrasive cleaning material projection nozzle 18 is always oriented in the direction orthogonal to the surface to be processed Wc and the distance between the surface to be processed Wc is kept constant, the presence or absence of inclination of the surface to be processed can be checked. Regardless, the degree of the work surface Wc is made uniform, which leads to an improvement in the commercial value of the work W, and the applicable shape of the work W is diversified, and the versatility of the shot blasting apparatus is enhanced.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The shot blasting apparatus of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows the entire system of the shot blasting apparatus Z according to the embodiment of the present invention. This shot blasting device Z, as shown in FIG. 1, has a work placing means A and a polishing / cleaning material pressure feeding means B.
Polishing material projection unit C, projection unit supporting means D, projection unit elevating means E, projection unit traversing means F, fixed side masking means G, movable side masking means H, upper masking means I and lower masking means J. Is a device for blasting a part of the surface of the retaining wall concrete block W as shown in FIG. The specific structure and operation of each component of the shot blasting device Z will be described later in detail. Here, the structure of the retaining wall concrete block W, which is a work, will be described first with reference to FIG. 7.

Structure of Retaining Wall Concrete Block W The above retaining wall concrete block W has a substantially L-shaped cross-sectional shape having a bottom wall portion Wa and a front wall portion Wb extending in a substantially orthogonal state as shown in FIG. And a drainage groove Wf extending in the width direction at the bottom of the front wall portion Wb, and two drain holes Wg, W on the left and right at a position above the drainage groove Wf.
g are formed respectively. This retaining wall concrete block W has the above-mentioned front wall portion Wb in its construction state.
Since a portion of the surface Wc of the surface Wc above the parting groove Wf is exposed to the outside as an outer surface of the retaining wall, the exposed portion is blasted by a shot blasting device Z described later to obtain a desired design property. Is added to increase the added value. Therefore, in this retaining wall concrete block W, in the manufacturing process, cosmetic aggregates having various shades are mixed in the surface layer portion near the surface Wc of the front wall portion Wb, and the surface Wc is blasted. As a result, the mortar layer on the surface Wc is appropriately removed by chipping so that the cosmetic aggregate is appropriately exposed in a scattered manner (see the "after blasting" portion in FIG. 1).

Outline of Blasting Method For the convenience of explanation of the shot blasting apparatus Z described later, the blasting method for the surface Wc of the retaining wall concrete block W will be briefly described. In this embodiment, The three retaining wall concrete blocks W are configured to be blasted at one time. Therefore, as shown in FIG. 7, first, the three retaining wall concrete blocks W, W, W are collided with their side surfaces Wd. The retaining wall concrete blocks W, W, W are arranged side by side in the width direction in a combined state.
The surfaces Wc, Wc, Wc of the same form the same plane. In this state, the rubber material 90 and the movable side masking of the fixed side masking means G, which will be described later, respectively over the entire vertical length of the outer side surfaces Wd, Wd of the retaining wall concrete blocks W, W located at both ends in the juxtaposition direction. Means H
And the rubber material 90 are placed in close contact with each other so that the surface of the rubber material 90 is flush with the surface Wc of the retaining wall concrete block W. Further, on the upper surface We side of each retaining wall concrete block W, a rubber material 93 of an upper masking means I to be described later that integrally traverses with the abrasive cleaning material projection unit C as described later, and the surface thereof is the retaining wall concrete. The block W is closely arranged so as to be flush with the surface Wc of the block W. Further, in the parting groove Wf portion of each of the retaining wall concrete blocks W, a rubber material 106 of a lower masking means J described later that integrally traverses with the abrasive cleaning material projection unit C as described later, and the surface thereof is the parting groove. The upper edge portion of Wf is closely arranged so as to be flush with the surface Wc.

In this state, a polishing / cleaning material projection unit C described later.
To the surface Wc of the retaining wall concrete block W, and two polishing / cleaning material projection nozzles 18, which will be described later, are supplied to the polishing / cleaning material to be pressure-fed with the pressurized air through the polishing / cleaning material pressure-feeding hose 7.
18 is projected onto the surface Wc, and the surface layer portion of the surface Wc is blasted. The concrete debris and dust scraped off by the projection of the abrasive material and the projected abrasive material are sucked and discharged through the vacuum hose 8. In this case, the polishing / cleaning material projection unit C is moved in a zigzag shape by alternately repeating vertical ascending / descending and lateral traversing, as shown by the projection unit movement locus L in FIG. Together with the above-mentioned abrasive cleaning material projection unit C
The abrasive cleaning material projection nozzles 18 are reciprocated in the left-right direction. As a result, the surface Wc is uniformly blasted in the range corresponding to the width of the reciprocating motion of each of the abrasive cleaning material projection nozzles 18, 18 along the vertical direction of the abrasive cleaning material projection unit C.

The traverse operation of the abrasive cleaning and projecting unit C at the upper and lower ends of the front wall Wb is intended to prevent edge chipping and excessive chipping at the upper and lower ends and to maintain the suction action of the vacuum hose 8. Then, the polishing / cleaning material projection unit C is performed in a state in which it corresponds to the rubber material 93 and the rubber material 106, respectively. In the same meaning, blind plugs are attached to the drain holes Wg.

Further, in this embodiment, as described above, each retaining wall concrete block W is placed with the bottom wall portion Wa thereof facing downward for blasting. The method of placing W is not limited to this. For example, the side wall Wd of the retaining wall concrete block W can be placed downward, and this placing method is a processing target. It can be appropriately selected according to various conditions such as the size and shape of the retaining wall concrete block W.

Structure, Operation, etc. of Shot Blasting Device Z Hereinafter, a specific structure of the shot blasting device Z for blasting the surface Wc of the retaining wall concrete block W as described above will be described in detail.

The shot blasting device Z is, as described above, a work placing means A, a polishing / cleaning material pressure feeding means B, a polishing / cleaning material projection unit C, a projection unit supporting means D, a projection unit elevating means E and a projection unit traversing means F. And a fixed side masking means G, a movable side masking means H, an upper masking means I and a lower masking means J. Hereinafter, the specific structure of each of these components will be described individually.

Work placing means A The work placing means A is for placing and fixing the three retaining wall concrete blocks W to be worked at predetermined working positions, respectively. As shown, a plurality of girder members 81, 81, arranged in parallel at a predetermined interval.
···, and each of the girder members 81, 81 ···, on which three retaining wall concrete blocks W, W, W are placed in a line so that their surface Wc forms the same plane. To be done. In this case, although not shown, reference plates are attached to the front ends of the respective girder members 81, 81, ...
The respective retaining wall concrete blocks W, W, W are positioned in the work loading direction by bringing the lower end of the front wall portion Wb into contact with the reference plate.

The lateral positioning of each of the retaining wall concrete blocks W, W, W is performed by the side surface of the fixed side masking means G and the side surface of the movable side masking means H, which will be described later. The details of the structures of the fixed side masking means G and the movable side masking means H will be described later, but a brief description will be given only of the configuration relating to the positioning of the retaining wall concrete block W in the width direction by the above. The side masking means G is fixedly arranged on one end side in the width direction of the work placing means A, and the inner side surface thereof functions as a positioning surface. Further, the movable side masking means H is arranged on the other end side in the width direction of the work placing means A so as to be movable in the left-right direction, and the inner side surface thereof functions as a positioning surface.

Therefore, when placing the retaining wall concrete blocks W, W, W on the work placing means A, first, the movable side masking means H is moved outward in the width direction to move the movable side masks. The interval between the masking means H and the fixed side masking means G is set to be larger than the total width of the three retaining wall concrete blocks W, W, W. And the first retaining wall concrete block W
Is carried in from the work carrying-in direction using a forklift, an overhead crane, etc., the lower end of the front wall portion Wb is brought into contact with the reference plate, and the side surface Wd thereof is abutted against the inner side surface of the fixed side masking means G. The workpieces are placed on the work placing means A in a state where they are brought into contact with each other and positioned in both the front-back direction and the width direction. Next, the second retaining wall concrete block W is carried in, and the lower end of the front wall portion Wb is abutted on the reference plate, and the side surface Wd is abutted on the side surface Wd of the first retaining wall concrete block W, whereby bidirectional positioning is performed. Go and place this. The last retaining wall concrete block W is also placed in the same manner as the second retaining wall concrete block W. Thereafter, the movable side masking means H is moved inward in the width direction and fixed in a state of being brought into contact with the side surface Wd of the third retaining wall concrete block W. Above,
The work of placing and fixing the retaining wall concrete blocks W, W, W to the work placing means A is completed.

Polishing / cleaning material pressure-feeding means B As shown in FIG. 1, the polishing / cleaning material pressure-feeding means B includes a compressor 1, an air dryer 2, a blast machine 3, and an elevator 4.
And a cleaning and cleaning material sorting and collecting machine 5 and a dust collecting unit 6. The pressurized air generated in the compressor 1 is dried in the air dryer 2 and then supplied to the blasting machine 3, where the blasting material is taken out from the blasting material tank (not shown) in the blasting machine 3. In the mixed state, the polishing / cleaning material is pneumatically fed to the polishing / cleaning material projection nozzle 18 to be described later through the polishing / cleaning material pressure supply hose 7 and projected toward the surface Wc of the retaining wall concrete block W. Further, the concrete debris scraped off from the surface Wc of the retaining wall concrete block W by the projection of the abrasive cleaning material, the dust, and the projected abrasive cleaning material are sucked and vacuumed through the vacuum hose 8, and the abrasive cleaning material sorting and collecting machine 5 The polishing / cleaning material sorting and collecting machine 5 collects the above-mentioned polishing / cleaning material from concrete debris and the like. Further, the polishing / cleaning material collected by the polishing / cleaning material selecting / recovering machine 5 is supplied to the polishing / cleaning material tank of the blasting machine 3 by the elevator 4 for reuse. On the other hand, the concrete debris and dust sorted by the abrasive cleaning material sorting and collecting machine 5 are sent to the dust collecting unit 6 where they are processed. The abrasive cleaning material pressure-feeding hose 7 and the vacuum hose 8 are both made of a material having appropriate flexibility in order to follow the movement of the abrasive cleaning material projection unit C described later.

Polishing / Cleaning Material Projection Unit C The polishing / cleaning material projection unit C is supported by projection unit supporting means D, which will be described later, as shown in FIGS. 2 and 3, and moves along the surface Wc of the retaining wall concrete block W. The surface Wc is then subjected to a predetermined blasting process, and its specific structure will be described below with reference to FIGS. 4 to 6.

As shown in FIGS. 4 to 6, the abrasive cleaning / projecting unit C includes a substantially rectangular housing 10 made of a steel plate. This housing 10 has a vacuum chamber 11 inside.
And the lower part 11a of the vacuum chamber 11
Is formed in a funnel shape by swelling the bottom wall 10d of the housing 10 downward, and one end of the vacuum hose 8 is connected to the lower portion 11a.

A rear wall 1 facing the front-rear direction of the housing 10.
0a and the front wall 10b, an elongated hole opening 12 extending laterally with a predetermined length is formed in a substantially central portion in the vertical direction of the rear wall 10a. This long hole opening 1
2, a pair of abrasive cleaning material projection nozzles 18, 18 to which one end of the abrasive cleaning material feeding hose 7 is connected is reciprocated along the extending direction of the elongated hole opening 12 by a nozzle slide mechanism 20 described below. It is movably attached.

The nozzle slide mechanism 20 is provided with a slider 21 formed by bending a plate material having a predetermined width into a substantially U shape. The slider 21 has an upper end portion which is the housing 1 described above.
0 in the width direction of the housing 10 (that is, the extending direction of the long hole opening 12) by the guide rods 26 mounted between the brackets 25 provided at both upper ends of the rear wall 10a. While supporting it so that it can move,
At its lower end, the four grooved guide rollers 23, 23, ... Provided here are engaged with both edges of the guide plate 22 arranged at the lower end of the rear wall 10a of the housing 10 so that the housing 10 It is slidably supported in the width direction.

A pair of left and right abrasive / cleaning material projection nozzles 18, 18 are provided at the left and right sides of the slider 21 corresponding to the elongated hole opening 12 via connecting rods 24 fixed to the slider 21. The polishing / cleaning material projection nozzles 18, 18 are arranged in parallel at a predetermined interval, and the tip portions of the polishing / cleaning material projection nozzles 18, 18 are made to project into the vacuum chamber 11 of the housing 10 through the elongated hole openings 12, respectively. It should be noted that each of the polishing / cleaning material projection nozzles 18, 18 is inserted into the elongated hole opening 12 through which the pair of polishing / cleaning material projection nozzles 18, 18 are arranged.
The seal cloth material 13 is attached so as not to hinder the sliding action of 18.

Further, a rack rod 27 is attached to a lower position of the guide rod 26 so as to straddle the pair of left and right brackets 25, 25, and the rack rod 27 is engaged with the slider 21 side. The pinion gear 28 is attached via a speed reducer 29 and an air motor 30.

Therefore, the above-mentioned pair of abrasive cleaning projection nozzles 1
The air motor 30 rotates the pinion gear 28 to slide the slider 21 in the width direction of the housing 10 so that the sliders 8 and 18 are slid integrally with the slider. Then, the rotation of the air motor 30 is alternately switched by, for example, limit switches (not shown) which are arranged on both left and right ends of the guide rod 26 and are turned on and off by the slider 21, respectively. The projection nozzles 18 and 18 are integrally reciprocally movable within a range of a predetermined stroke S.

Here, the air motor 30 is adopted as the driving means for reciprocating the pair of the abrasive cleaning projection nozzles 18, 18, but this driving means is not limited at all. Of course, this may be replaced with other driving means such as a rodless cylinder.

On the other hand, a rectangular projection opening 14 having a predetermined size is formed in the front wall 10b of the housing 10 at a position facing the elongated hole opening 12, and the projection opening 1 is formed.
A brush 15 is attached to the outside of the projection 4 so as to surround the projection opening 14. Then, the abrasive cleaning material projected while being radially expanded from the pair of abrasive cleaning material projection nozzles 18, 18 is blown forward through the projection opening 14 as shown by a chain line in FIGS. 4 and 6.

Further, the ceiling wall 10c of the housing 10 is provided with a large number of secondary air introducing holes 17, 17 ... Which are small holes.

Projection Unit Support Means D The projection unit support means D is the above-mentioned abrasive cleaning material projection unit C.
2 and FIG. 3 for supporting the polishing / cleaning material projection unit C on the surface Wc of the retaining wall concrete block W as necessary and supporting the same on the side of the projection unit elevating means E described later. As shown in FIG. 3, a mounting bracket 32 and a link mechanism 31 described below are provided.

The mounting bracket 32 is formed by bending a strip plate into a rectangular frame shape. The mounting bracket 32 is provided at the tip portion of the housing 10 in the polishing / cleaning material projection unit C, and the upper half thereof is the housing 10.
Is fixed to the ceiling wall 10c and the left and right side walls 10e, 10e, and the lower half thereof is attached to the bottom wall 10d of the housing 10.
It is attached in a state in which it is extended further downward than that, and moreover, the front edge thereof matches the front wall 10b of the housing 10 (see FIG. 4). This mounting bracket 32
On the upper surface side of the pair of left and right upper guide rollers 33, 33
However, on the lower surface side, a pair of left and right lower guide rollers 3
4, 34 are attached respectively. Each of these guide rollers 33, 34 corresponds to the guide means in the claims, and both of them are caster type rollers whose rolling direction can be freely changed. The housing 10 of each of the guide rollers 33, 34.
2 and 4, the upper and lower guide rollers 33, 33 and the lower guide rollers 34, 34 are in contact with the front surface Wc of the retaining wall concrete block W, respectively. In, the front wall 10b of the housing 10 faces the surface Wc in parallel at a predetermined interval, and the brush 15 is appropriately bent to be pressed against the surface Wc.

The link mechanism 31 includes the first link bar 37.
And a second link bar 38 and a third link bar 39. The first link bar 37 has an intermediate position between the first pivot pin 4 and the upper support base 35, which is arranged so as to extend forward from a lift 51 of a projection unit lift means E described later.
0 is swingably supported in the vertical direction, one of the swing ends thereof is connected to the air cylinder 45 arranged on the side of the lift 51, and the other swing end thereof is the polishing / cleaning material projection unit. It is coaxially supported together with one end of the third link bar 39 at an intermediate position of the mounting bracket 32 fixed to the front end of the C housing 10.

The second link bar 38 has a third end with respect to the lower support base 36 extending from the elevating base 51.
While being pivotally supported by a pivot pin 42, the other end is pivotally supported at the lower end side of the mounting bracket 32 by a fourth pivot pin 43 together with the other end of the third link bar 39. The pair of upper and lower first link bars 37 and second link bars 38 constitutes a parallel link, and the third link bar 39 connected to the ends thereof is always held in a fixed posture. .

By the way, the mounting bracket 32 fixed to the housing 10 of the abrasive cleaning and projection unit C is rotatably supported in the arrow fg direction by the second pivot pin 41 as described above. Further, since the position of the second pivot pin 41 is closer to the front than the position of the center of gravity of the abrasive cleaning material projection unit C, the abrasive cleaning material projection unit C always keeps the second pivot pin 41 by its own weight. It receives a rotation moment in the direction of arrow g at the center. For this reason, stoppers 48 and 49 capable of engaging with each other are provided at the lower end of the third link bar 39 and the lower end of the mounting bracket 32, respectively, and no external force acts on the abrasive cleaning material projection unit C. If not, the two stoppers 48 and 49 are engaged with each other so that the arrow g
The maximum rotation position in the direction is regulated. In addition, the abrasive cleaning material projection unit C includes the air cylinder 4
The first link bar 37 is rotationally displaced by the expansion and contraction operation of 5, so that the first link bar 37 is driven forward and backward in the direction of arrow de. Specifically, as the air cylinder 45 expands, the abrasive cleaning material projection unit C retracts in the direction of arrow d and separates from the surface Wc of the retaining wall concrete block W, and the air cylinder 45 shrinks. Thus, the abrasive cleaning material projection unit C advances in the direction of arrow e and approaches the surface Wc.

The projection unit supporting means D is shown in FIG.
As shown in FIG. 3, they are provided on both the left and right sides of the above-mentioned abrasive cleaning projection unit C, respectively.

Projection Unit Elevating Means E The projection unit elevating means E is for vertically moving the polishing / cleaning material projection unit C supported via the projection unit supporting means D together with the projection unit supporting means D in the vertical direction. As shown in FIG. 2 and FIG. 3, an elevating column 55 vertically arranged on a transverse carriage 77, which will be described later,
And an elevating table 51 that is vertically moved along the elevating column 55.

The elevating columns 55 are a pair of left and right main columns 56 and 56 which are vertically arranged upright at predetermined intervals in the width direction of the retaining wall concrete block W, and the respective main columns 56 and 56.
It is composed of a pair of left and right auxiliary columns 57, 57 arranged in a slanting shape on the rear side of the.

The elevating table 51 is a frame-like body having a width dimension that can be interposed between a pair of left and right main columns 56, 56 of the elevating column 55, and the left and right sides of the front end thereof are vertically arranged. Extending front end frame members 52, 52 are provided respectively. Then, on the left and right front end frame members 52, 52, an upper support base 35 and a lower support base 36 for supporting the projection unit support means D, D, respectively, are attached.

Further, guide rollers 53, 53, ... Are attached to the upper and lower ends of the front end frame members 52, 52 of the lift table 51, respectively, facing outward. , ... Can be rolled up and down along the corresponding main pillars 56, 56, so that the lift table 51 can be lifted up and down along the lift pillars 55.

Further, two cable end stoppers 71 and 73 are attached to the upper ends of the front end frame members 52 and 52, respectively, and one cable end stopper 72 is attached to the lower end thereof. One end of a pair of left and right chains 68, 68 is respectively connected to the two rope end stoppers 71, 71 located at the upper end of the front end frame member 52, and the other ends of the pair of chains 68, 68 are After being respectively wound around a pair of left and right upper sprockets 63, 63 pivotally mounted on a rotary shaft 61 arranged at the upper end of the elevating column 55, it is pulled out to the lower end side of the elevating column 55 and further to the traverse carriage 77 side described later. A pair of left and right lower sprockets 64, 6
After being wound around each of the four ends, they are pulled up and connected to the rope end stoppers 72, 72, respectively.

Further, the pair of right and left rope end stoppers 73, 73
A pair of left and right chains 69, 69 connected to one end of the chain
The other end of is hung around the pair of left and right sprockets 65, 65 pivotally attached to the rotary shaft 61, and then pulled out downward to be connected to the counterweights 70, 70, respectively. Further, the rotary shaft 61 has a drive pulley 62
The drive pulley 62 is attached to the motor 6
The rotary shaft 61 is rotated by being rotationally driven by 0, and the upper sprocket 63, 63 and the sprocket 65, 65 are synchronously rotated. Therefore, the lift table 51 connected by the pair of left and right chains 68, 68 is lifted and lowered in the vertical direction (arrow h-i direction) by the upper sprocket 63, 63 being rotationally driven by the motor 60. As a result, the polishing / cleaning material projection unit C is driven up and down.

The elevation range of the abrasive cleaning material projection unit C by the projection unit elevating means E is as shown in FIG. 2 and FIG. Between the upper position of the block W and the upper position of the block W, and the upper and lower positions of the abrasive cleaning material projection unit C retracted from the parting groove Wf of the retaining wall concrete block W as indicated by the reference numeral C ″. It

Further, the polishing / cleaning material pressure feed hose 7 and the vacuum hose 8 extending from the polishing / cleaning material projection unit C to the rear of the polishing / cleaning material projection unit C are suspended and supported by the lifting / lowering table 51. It goes up and down together.

Projection Unit Traversing Means F The projection unit traversing means F is mounted on a front and rear rails 76, 46 installed on a base 75 arranged in parallel with the work placing means A in front thereof. Wheels 78,7
., And each of the wheels 78, 78 ,.
It is composed of a traverse carriage 77 which traverses along the lines 6, 76. Then, the elevating pillar 5 is mounted on the traverse carriage 77.
5 is fixed upright. Therefore, when the traverse carriage 77 traverses, the abrasive cleaning material projection unit C can be moved in the width direction of the retaining wall concrete block W.

Fixed side masking means G and movable side
The side masking means H and the side masking means G on the fixed side and the side masking means on the movable side H are for securing a placing work space when the retaining wall concrete block W is placed on the work placing means A as described above. The other configurations are exactly the same, except that it can be moved to
Here, referring to FIG. 2, fixed side masking means G
For the movable side masking means H, the description of the fixed side masking means G will be used.

The fixed side masking means G is fixedly arranged on one end side in the width direction of the work placing means A as shown in FIG. 1, and its concrete structure is shown in FIG. As shown in FIG.
Each of the masking pieces 85 to 89 is selectively used according to the height dimension of the retaining wall concrete block W to be processed. Also, the front surface 85a of each of these masking pieces 85-89
A rubber material 90 is attached to each of the ~ 89a. By stacking and installing the masking pieces 85 to 89, these rubber materials 90, 90, ... Rubber material (see Figure 1)
Is configured.

Upper Masking Means I The upper masking means I is for masking the abrasive cleaning material projection unit C at a position above the upper end of the retaining wall concrete block W, and as shown in FIGS. A rectangular plate-shaped frame member 94 having a rubber member 93 mounted on its front surface, and a pair of left and right fixed brackets 9 detachably attached to the main pillar 56 of the elevating pillar 55.
One end of each of the upper link bar 95 and the lower link bar 96 is connected to one end of the frame member 94 and the other end thereof is connected to the left and right sides of the frame member 94. Direction (arrow j
And an air cylinder 98 that rotates in the −k direction). In addition, at the lower end of the frame member 94, the retaining wall concrete block W is formed as the transverse carriage 77 traverses.
Guide rollers 99, 99 rolling on the upper surface We of the above are attached.

Further, the upper masking means I can appropriately select the mounting position of the fixing bracket 97 with respect to the elevating support column 55 in the vertical direction, so that a plurality of types of retaining wall concrete having different height dimensions of the surface to be processed can be obtained. It is also applicable to the block W.

Lower Masking Means J The lower masking means J is for masking the portion of the retaining wall concrete block W below the parting groove Wf with respect to the abrasive cleaning material projecting unit C. Sliding support portion 1 provided on the main pillar 56 of the lifting pillar 55
02. The parting of the retaining wall concrete block W at the tips of a pair of left and right advancing / retreating girders 101, 101 that are slidable in the front-rear direction (arrow mn direction) and are driven forward and backward by expansion and contraction of the air cylinder 103. While installing the guide rollers 104, 104 rolling in the groove Wf,
A rubber material 106 for masking is attached between the tip ends of the pair of left and right advancing / retreating girders 101, 101 and the tip ends of the pair of left and right supporting frames 105, 105 extending downward from the advancing / retreating girders 101, 101. There is.

Description of Operation of Shot Blasting Device Z The outline of the operation of the shot blasting device Z configured as described above has already been described, and therefore, here, only the important ones of the respective constituent elements will be described. It will be explained individually according to the work procedure of blasting work.

First, the work of placing the retaining wall concrete block W on the work placing means A is carried out. At this time, the transverse carriage 77 is stopped at one of the left and right ends of the work placing means A. Let In addition, the air cylinder 4
5 is extended to retract the abrasive cleaning material projection unit C in the direction of arrow d, and the abrasive cleaning material projection unit C is set by the projection unit elevating means E to any one of the upper and lower positions of the elevating range. . Further, the upper masking means I is raised in the direction of arrow j, and the lower masking means J is retracted in the direction of arrow m. Under such a state, the placing work of the retaining wall concrete block W is performed.

When the placing work of the retaining wall concrete block W on the work placing means A is completed, the upper masking means I is lowered in the direction of arrow k so that the guide rollers 99, 99 are moved to the retaining wall concrete block W. The rubber material 93 is set at a predetermined masking position by abutting it on the upper surface We of the guide roller 10 and the lower masking means J is also advanced in the direction of arrow n to guide the guide roller 10.
4, 104 is brought into contact with the parting groove Wf of the retaining wall concrete block W, and the rubber material 106 is set at a predetermined masking position.

Thereafter, the air cylinder 45 is reduced and the abrasive cleaning material projection unit C is moved forward in the direction of arrow e so that the brush 15 located on the front surface of the housing 10 is placed on the surface Wc of the retaining wall concrete block W. Abut. In this case, an external force does not act on the abrasive cleaning material projection unit C (that is, the abrasive cleaning material projection unit C is separated from the retaining wall concrete block W side, and the operating force of the air cylinder 45 acts on the abrasive cleaning material projection unit C). In the non-operating state), the abrasive cleaning / projecting unit C is rotated in the direction of arrow g about the second pivot pin 41 due to its own moment of weight, and therefore in this state, the lower guide rollers 34, 34 are placed.
Is most forwardly projected and is in the state of being closest to the surface Wc of the retaining wall concrete block W. From this state, when the air cylinder 45 is contracted to move the entire polishing / cleaning material projection unit C forward, first, the lower guide rollers 34, which are located below the housing 10,
34 contacts the surface Wc of the retaining wall concrete block W, and as the abrasive cleaning material projection unit C is pushed forward by the air cylinder 45, the abrasive cleaning material projection unit C is centered on the lower guide rollers 34, 34. It rotates in the direction of arrow f, and finally the upper guide rollers 33, 33 on the upper side of the housing 10 come into contact with the surface Wc of the retaining wall concrete block W, whereby the forward movement is stopped. Moreover, the pressing action of the abrasive cleaning material projection unit C by the operating force of the air cylinder 45 to the surface Wc side is maintained until the end of the work.

This state is the state shown in FIG. Therefore, in this state, the upper guide rollers 33, 3 are
3 and the lower guide rollers 34.34 both come into contact with the surface Wc of the retaining wall concrete block W, so that the housing 10 of the abrasive cleaning projection unit C (in other words, the abrasive cleaning projection nozzles 18, 18) The distance from the surface Wc is kept constant, and the projection direction of the abrasive cleaning material projection nozzle 18 is always defined as a direction orthogonal to the surface Wc. Moreover, the relative relationship between the abrasive cleaning projection nozzle 18 and the surface Wc is such that the abrasive cleaning projection unit C is rotatably supported about the second pivot pin 41 and the abrasive cleaning projection unit C is rotatable. This is achieved by the structure in which C is pressed against the front surface Wc side by the operating force of the air cylinder 45. Therefore, not only when the front surface Wc coincides with the vertical plane as in this embodiment, W
The same applies when c is inclined in the front-rear direction with respect to the vertical plane, or when the surface Wc is a curved surface having a relatively small curvature. Further, for example, when there is a local unevenness on the surface Wc, the brush 15 in contact with the surface Wc is appropriately flexibly deformed to absorb the unevenness, so that the housing 10 itself is rotationally displaced. Instead, the relative relationship between the abrasive cleaning material projection nozzle 18 and the surface Wc as described above is maintained regardless of the presence of the unevenness.

Next, in this state, the pair of abrasive cleaning material projection nozzles 18, 18 of the abrasive cleaning material projection unit C are reciprocated within a predetermined stroke, and each abrasive cleaning material projection nozzle 1 is moved.
From 8 and 18, the abrasive cleaning material is projected together with the pressurized air toward the surface Wc of the retaining wall concrete block W to start the blasting work, and the abrasive cleaning material projection unit C itself is vertically driven at a predetermined speed. The mortar layer in the surface layer of the surface Wc is appropriately shaved by the projected abrasive cleaning agent to appropriately expose the internal cosmetic aggregate.

By projecting the polishing / cleaning material by moving the polishing / cleaning material projection unit C up and down, a belt-like shape having a width substantially corresponding to the stroke S of the polishing / cleaning material projection nozzles 18 and 18 is formed on the surface Wc. Will be blasted. In this case, firstly, the above-mentioned abrasive cleaning projection nozzles 1
Since the relative relationship between 8, 18 and the surface Wc of the retaining wall concrete block W (that is, the relationship between the distance and the projection direction) is always kept constant, the degree of processing on the surface Wc is made as uniform as possible. To be done. Second, the abrasive cleaning projection nozzle 18
Since the abrasive cleaning material projected from the surface gradually spreads radially and collides with the surface Wc with a predetermined projection area, within a range of this projection area, the abrasive cleaning material in a vertical state becomes closer to the projection axis. Since the distance with the polishing / cleaning material projection nozzle 18 is short as the collision occurs, the degree of processing (that is, the degree of chipping) becomes high, and a relatively large difference occurs in the degree of processing depending on the distance from the projection axis. Therefore, if the polishing / cleaning material projection nozzle 18 is moved up and down along the surface Wc while being fixed in a fixed position without reciprocating, the blasting completion portion extending in a strip shape along the up / down direction is closer to the center in the width direction. The result is a state in which the cutting is performed to a large extent, which is extremely unfavorable in terms of uniformity of the processed surface. However, when the polishing / cleaning material projection nozzles 18, 18 are moved up and down while reciprocating within a predetermined stroke as in this embodiment, unevenness in the degree of processing due to the radial spread of the polishing / cleaning material occurs. Although it is eliminated as much as possible and a low degree of processing occurs at both end portions in the width direction of the processing portion extending in a strip shape, the degree of processing is made uniform as a whole.

For these two reasons, uniform blasting is performed over the entire surface Wc of the retaining wall concrete block W, the precision of the processed surface is good, and by extension the retaining wall concrete block W Product value is improved.

Next, when the abrasive cleaning material projection unit C moves up and down to pass through the upper or lower end of the retaining wall concrete block W to reach the upper masking means I or the lower masking means J, at that time, the abrasive cleaning material Projection unit C
Is temporarily stopped, and this time, the traverse carriage 77 is traversed to shift the blasting position in the width direction of the retaining wall concrete block W laterally by a predetermined amount, and the polishing / blasting material projection unit C is moved up and down again for blasting. To start. By repeating such lifting and descending and traversing of the abrasive cleaning material projection unit C in sequence, the entire surface Wc of the retaining wall concrete block W is uniformly blasted. Incidentally, by appropriately setting the amount of traverse of the abrasive cleaning material projection unit C, that is, the overlapping width of the preceding processing area and the following processing area, the abrasive cleaning material projection nozzle 18 is used to remove the abrasive cleaning material as described above. It is possible to surely prevent the inconvenience caused by being projected while being spread radially, that is, the portions having a low degree of processing are formed at both end portions in the width direction of the band-shaped processed portion.

On the other hand, when blasting is performed by the abrasive cleaning material projection unit C, the vacuum hose 8 is connected to the bottom portion of the housing 10, and the retaining wall concrete block W of the retaining wall concrete block W is provided around the projection opening 14. Since the brush 15 that comes into contact with the surface Wc is provided, the abrasive cleaning material projected from the abrasive cleaning material projection nozzle 18 toward the surface Wc and the concrete scraped off from the surface of the surface Wc by the abrasive cleaning material. The above-mentioned brush 15
Is prevented from scattering to the surroundings and is dropped and accumulated on the bottom of the housing 10 by its own weight and is sucked and discharged to the outside through the vacuum hose 8 from the bottom, so that the polishing and cleaning material is smoothly discharged and the surroundings. It is compatible with maintaining the work environment of.

Further, by providing the brush 15 around the projection opening 14 of the housing 10, the following advantages can be obtained.

First, for example, a retaining wall concrete block W
Even if the concrete debris scraped off from the surface Wc adheres and remains on the surface Wc without dropping from the surface Wc, the concrete debris can be moved up and down or traversed along the surface Wc by the abrasive cleaning material projection unit C itself. Is wiped off by the brush 15 so that the discharge action of the concrete debris can be ensured.

Secondly, the secondary air is introduced into the vacuum chamber 11 from the secondary air introducing hole 17 provided on the ceiling surface 10c of the housing 10 by the suction action on the side of the vacuum hose 8. At the same time, Since the brush 15 has air permeability, secondary air is also sucked from the portion of the brush 15. Then, the secondary air introduced into the vacuum chamber 11 is sucked into the vacuum hose 8 side as it is, so that a strong air flow directed toward the vacuum hose 8 side is generated in the housing vacuum chamber 11, and this air is generated. The flow makes it possible to further improve the suction and discharge action of the above-mentioned abrasives or concrete fragments. At the same time, the degree of vacuum inside the vacuum chamber 11 is appropriately reduced by the secondary air, and the suction action acting between the vacuum chamber 11 and the work surface Wc is suppressed,
The polishing and cleaning material projection unit C can be easily moved up and down or traversed, and the polishing and cleaning material projection unit C can be smoothly moved.

[Brief description of drawings]

FIG. 1 is an overall system diagram of a shot blasting apparatus according to an embodiment of the present invention.

FIG. 2 is an enlarged view taken along the line II-II shown in FIG.

FIG. 3 is a view on arrow III-III in FIG.

4 is a vertical cross-sectional view showing a specific structure of the abrasive cleaning material projection unit shown in FIG.

5 is a view taken along the line VV of FIG.

6 is a view taken along the line VI-VI in FIG.

FIG. 7 is an explanatory diagram of a work method for blasting using the shot blasting apparatus of the present invention.

[Explanation of symbols]

1 is a compressor, 2 is an air dryer, 3 is a blast machine, 4 is an elevator, 5 is an abrasive cleaning material sorting and collecting machine, 6 is a dust collecting unit, 7 is an abrasive cleaning material pressure supply hose, 8 is a vacuum hose, 10 is a housing, Reference numeral 11 is a vacuum chamber, 12 is an elongated hole opening, 13 is a seal cloth material, 14 is a projection opening, 15 is a brush 1, 17 is a secondary air introduction hole, 18 is a polishing / cleaning material projection nozzle,
20 is a nozzle slide mechanism, 21 is a slider, 22 is a guide plate 2, 23 is a guide roller, 24 is a connecting rod, 2
5 is a bracket, 26 is a guide rod, 27 is a rack rod, 28 is a pinion gear, 29 is a reducer, 30 is an air motor, 31 is a link mechanism, 32 is a mounting bracket, 3
3 is an upper guide roller, 34 is a lower guide roller,
Reference numeral 35 is an upper support base, 36 is a lower support base, 37 to 39 are link bars, 40 to 43 are pivot pins, 45 is an air cylinder, 48 and 49 are stoppers, 51 is a lift base, 52 is a front end frame member, 53 is a guide roller, 55 is a lifting column, 56 is a main column, 57 is an auxiliary column, 60 is a motor, 61
Is a rotary shaft, 62 is a drive pulley, 63 to 66 are sprockets, 68 and 69 are chains, 70 is a counterweight, 71 to 73 are rope end stops, 75 is a base, 76 is a rail, 77 is a traverse carriage, and 78 is Wheels, 79 is motor, 8
1 is a girder material, 85-89 are masking pieces, 90 and 9
3 is a rubber material, 94 is a frame material, 95 is an upper link bar, 9
6 is a lower link bar, 97 is a fixed bracket, 98 is an air cylinder, 99 is a guide roller, 101 is an advance / retreat girder,
102 is a sliding support part, 103 is an air cylinder, 104 is a guide roller, 105 is a support frame, 106 is a rubber material, A is a work placing means, B is a polishing and cleaning material pressure feeding means, C is a polishing and cleaning material projection unit, D is a projection unit supporting means, E is a projection unit elevating means, F is a projection unit traversing means, G
Is a fixed side masking means, H is a movable side masking means, I is an upper masking means, J is a lower masking means, L is a projection unit movement locus, W is a retaining wall concrete block (work), and Z is a shot blasting device. is there.

Claims (2)

[Claims] 1. An appropriate chipping action is imparted to the surface layer of the work surface (Wc) by projecting an abrasive material onto the substantially flat work surface (Wc) of a work (W) which is a concrete molded product. Which is a shot blasting device, which comprises a work placing means (F) for placing and fixing the work (W) such that the surface direction of the work surface (Wc) is along the up-down direction, and granular polishing. The polishing / cleaning material pressure feeding means (A) for mixing the material with the pressurized air and pneumatically feeding it, and the polishing / cleaning material pressure-fed by the polishing / cleaning material pressure feeding means (A) together with the pressurized air in the work (W). A polishing / cleaning material projection unit (B) having a polishing / cleaning material projection nozzle (18) for projecting on the surface to be processed (Wc), and the above-mentioned polishing / cleaning material projection unit (B) having the polishing / cleaning material projection nozzle (18). Always faces the surface to be processed (Wc) at a predetermined interval and is orthogonal to this. The projection unit supporting means (C) for supporting so as to maintain the projection direction and the polishing / cleaning material projection unit (B) are vertically moved up and down along the surface direction of the work surface (Wc) of the workpiece (W). And a projection unit traversing means (E) for traversing the polishing unit projection unit (B) in the left-right direction along the surface direction of the work surface (Wc) of the workpiece (W). And a shot blasting device. 2. The projection unit supporting means (D) according to claim 1, wherein the projection / cleaning material projection unit (C) is swingable in a direction in which an axis of the polishing / cleaning material projection nozzle (18) is inclined. A link mechanism (31) that supports and operates the actuator (45) so as to move forward and backward in the direction toward and away from the work (W), and the abrasive cleaning material projection unit by the link mechanism (31). (C) is brought into contact with the work surface (Wc) of the work (W) with the forward movement of the work (W), whereby the abrasive cleaning material projection nozzle (1
8) is provided with the guide means (33) for defining the distance between the abrasive cleaning material projection nozzle (18) and the surface to be processed (Wc) to a predetermined size in a state where the surface (Wc) is orthogonal to the surface to be processed. A shot blasting device characterized in that