JP2016209958A - Blast processing device - Google Patents

Abstract

SOLUTION: In a blast processing device 1, a plurality of injection nozzles N are connected via a media supply passage 22 to one media supply means 6 for supplying media, and switching means (an opening-closing valve 41) is respectively provided in the respective media supply passages 22. To inject media from an injection nozzle belonging to a required group, the plurality of injection nozzles are classified into a plurality of groups (NUR, NUL, NBR, NBL, NSR, NSL, NF, and NB), and the switching means communicates the media supply passage corresponding to the injection nozzle of the required group with the supply means, and cuts off the communication between the media supply passage and the supply means corresponding to the injection nozzle of the other group.EFFECT: Miniaturization and cost reduction can be executed.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a blasting apparatus, and more particularly, to a blasting apparatus that includes a supply unit that supplies a medium and an injection nozzle that is provided at the tip of a medium supply passage and injects the medium.

2. Description of the Related Art Conventionally, a blasting apparatus having an injection nozzle that injects a medium onto an injection surface of a workpiece is known. In such a blasting apparatus, dirt or paint on the injection surface is removed, and a rust inhibitor is applied. The groundwork processing is performed.
Further, such a blasting apparatus includes a supply means for supplying media, a media supply passage connected to the supply means for circulating the media, and an injection nozzle provided at the tip of the media supply passage for injecting the media. Further, in order to eject media from various directions to the workpiece, a plurality of the above-described ejection nozzles are provided and divided into four blocks (Patent Document 1).

JP-A-11-254328

However, in Patent Document 1, the same number of individual blast material separating means 20 and supply headers 22 as the above blocks are required for the injection nozzles belonging to the above four blocks, and the configuration of the blasting apparatus is increased in size and cost. There was a problem of becoming higher.
In view of such a problem, the present invention provides a blasting apparatus capable of further downsizing and cost reduction.

That is, a blasting apparatus according to the present invention includes a supply unit that supplies a medium, a medium supply passage that is connected to the supply unit and distributes the medium, and an injection nozzle that is provided at the tip of the medium supply passage and injects the medium. In the equipped blasting machine,
A plurality of the media supply passages are provided, and the respective media supply passages are connected to the supply means via switching means,
Further, the plurality of spray nozzles are classified into a plurality of groups, and the switching unit communicates the media supply passage corresponding to the required group of spray nozzles with the supply unit, and supplies the media corresponding to the spray nozzles of other groups. By shutting off the communication between the passage and the supply means, the medium is ejected from the ejection nozzle belonging to the required group.

  According to the above invention, since all the injection nozzles can be connected to one supply means and the injection nozzles can be classified into a plurality of groups, the blasting apparatus can be reduced in size and the cost can be reduced. Can be planned.

Configuration diagram of blasting apparatus according to the present embodiment Side view showing the interior of the cleaning chamber Sectional view showing media supply means Piping diagram showing switching means

FIG. 1 shows a blasting apparatus 1 for injecting a medium such as a resin together with air to a workpiece. In particular, iron powder stains and dust stains adhering to the surface of a railcar carriage 2 as a workpiece. It is intended to be washed.
The blasting apparatus 1 includes a cleaning chamber 3 that accommodates the carriage 2 therein, a number of injection nozzles N that inject media into the carriage 2, and moving means 4 that moves the injection nozzle N (see FIG. 1). Not shown), air supply means 5 for supplying air to the ejection nozzle N, media supply means 6 for supplying media to the ejection nozzle N, and media recovery means for returning the ejected media to the media supply means 6 7, which are controlled by control means (not shown).
In the blast processing apparatus 1, when the carriage 2 is accommodated in the cleaning chamber 3, the carriage 2 is cleaned by jetting media from the front, rear, left, right, and top and bottom of the carriage 2 while the spray nozzle N moves. It has become.
In addition, as said blast processing apparatus 1, regardless of the said trolley | bogie 2 as a workpiece | work, it can process also about other articles | goods, and the other possible by ejecting media other than peeling of the said iron powder dirt etc. It is also possible to use this for processing. The media to be used can be appropriately selected according to the application.

As shown in FIG. 2, the carriage 2 has a frame 11 having a substantially H shape and wheels 12 pivotally supported on the front and rear of the frame 11, and although not shown, an accessory such as a motor is provided. Yes.
The frame 11 includes a center frame 11a provided substantially at the center and side frames 11b provided at both ends of the center frame 11a. The wheels 12 are provided at the front end and the rear end of the side frame 11b. It is designed to be pivotally supported.
In addition to the motor, the accessory parts include a hydraulic cylinder constituting the suspension, an air spring provided between the carriage 2 and the vehicle body, other rubber hoses, resin parts, and the like. In some cases, the media is ejected while it is attached.

As shown in FIG. 1, the cleaning chamber 3 is closed to prevent the media ejected from the ejection nozzle N from flying up, and a plurality of tapered shapes 3a are formed at the lower portion so that the fallen media can be It is collected by the media collection means 7.
As shown in FIG. 2, the cleaning chamber 3 is provided with an opening / closing door 3 b for taking in and out the carriage 2, a rail 13 for supporting the carriage 2, and a carriage on the rail 13. 2 is provided.
The stopper 14 is swingably provided by an air cylinder 14 a and moves to a retracted position retracted below the rail 13 and a projecting position protruding above the rail 13.
Then, the carriage 2 is pressed on the rail 13 by an operator and moved into the cleaning chamber 3, and then the stopper 14 moves from the retracted position to the protruding position and comes into contact with the wheel 12, thereby It is positioned at the position.
The carriage 2 may be moved on the rail 13 by using a known appropriate conveying means in addition to the movement by the operator.

A total of 36 spray nozzles N are provided inside the cleaning chamber 3, and a plurality of jet nozzles N are provided for cleaning the top and bottom surfaces, the right and left sides, the front and rear surfaces of the carriage 2 respectively. It is classified into groups.
Specifically, 12 top surface nozzles NU for cleaning the top surface of the carriage 2 are provided above the carriage 2, and six of these are provided on the right and left top surface nozzles NUR on the left and right in the traveling direction of the carriage 2. And a left top surface nozzle NUL.
Also, 12 bottom nozzles NB for cleaning the bottom surface of the carriage 2 are provided below the carriage 2, and these are provided as a right bottom nozzle NBR and a left bottom nozzle NBL, six on each side of the carriage 2 in the traveling direction. It has been.
Of the right bottom nozzle NBR and the left bottom nozzle NBL, three are arranged inside the wheel 12, and the other three are arranged outside the wheel 12, respectively. And are to be washed.
Three right side nozzles NSR for cleaning the right side of the carriage 2 are provided on the right side of the carriage 2, and three left side nozzles NSL for cleaning the left side of the carriage 2 are provided on the left side. .
Three front nozzles NF (see FIG. 2) for cleaning the front surface of the carriage 2 are provided in front of the carriage 2, and three rear nozzles NR (FIG. 2) for cleaning the rear face of the carriage 2 are provided behind. Reference) is provided.
As described above, in this embodiment, the 36 injection nozzles N are classified into a plurality of groups such as the bottom nozzle NB and the top nozzle NU, and the medium is injected from the injection nozzles N belonging to the required group, thereby generating the carriage. 2 required surfaces to be ejected are cleaned.

An air passage 21 is disposed between the ejection nozzle N and the air supply means 5, and a media supply passage 22 is disposed between the ejection nozzle N and the media supply means 6. Although not described, the medium supplied from the medium supply means 6 is ejected from the ejection holes by the air supplied from the air supply means 5.
The air supply means 5 of the present embodiment is a so-called low-pressure blower, and can supply low-pressure air to the injection nozzle N to inject a large amount of media with a large air volume from an injection hole having a large diameter.
The blasting apparatus 1 of this embodiment includes two air supply means 5. One air supply means 5 is the right top nozzle NUR, right bottom nozzle NBR, right side nozzle NSR, and front side nozzle. Each group of nozzles NF is branched and connected.
The other air supply means 5 is branched and connected to each group of the left top nozzle NUL, the left bottom nozzle NBL, the left side nozzle NSL, and the rear nozzle NR.
The control means controls the open / close valve provided in the air supply means 5 to switch and supply air to the injection nozzles N belonging to a required group.

FIG. 3 shows a cross-sectional view of the media supply means 6. The storage unit 31 for storing media, a plurality of supply chambers 32 provided below the storage unit 31, and the media in the supply chamber 32 are agitated. The first agitation gas passage 34 for supplying assist air into the supply chamber 32, the discharge nozzle 35 for discharging the medium from the supply chamber 32 to the medium supply passage 22, and the assist air to the discharge nozzle 35. And a second assist gas passage 36 for supplying gas.
As will be described later, a cyclone 55 constituting the media recovery means 7 is provided at the upper part of the storage unit 31, and the media recovered by the cyclone 55 is supplied to the storage unit 31.
Further, the lower portion of the accommodating portion 31 is processed into a taper shape, and a supply hole 31 a communicating with the supply chamber 32 is provided at the lower end portion. A stirring blade 37 that is rotated by a driving means (not shown) is provided above the supply hole 31a so that the medium in the storage portion 31 is stirred and dropped into the supply hole 31a.

As shown in FIG. 4, twelve supply chambers 32 are provided. Correspondingly, twelve supply holes 31a are formed in the accommodating portion 31, and media dropped from the supply holes 31a is temporarily stored. It is accommodated in the internal space of the supply chamber 32.
The stirring means 33 includes a rotating shaft 38 that rotatably passes through the wall on the right side of the supply chamber 32 in the figure, and a stirring member 39 is provided at the inner end of the supply chamber 32. Is provided with a pulley 40 connected to driving means (not shown).
When the rotating shaft 38 is rotated by the driving means via the pulley 40, the stirring member 39 rotates inside the supply chamber 32, so that the medium in the supply chamber 32 is stirred.
The first assist gas passage 34 passes through the inside of the rotary shaft 38 in the axial direction, and is connected to assist gas supply means (not shown) via a rotary joint (not shown).
One end of the discharge nozzle 35 protrudes into the supply chamber 32, and the tip thereof is provided at a position close to the tip of the rotating shaft 38, and the central axes thereof are positioned coaxially. ing.
On the other hand, the other end of the discharge nozzle 35 protrudes to the outside of the supply chamber 32 and is connected to the medium supply passage 22 and is connected to the second assist gas passage 36.
With the above configuration, the medium that has fallen into the supply chamber 32 is drawn into the discharge nozzle 35 by the assist gas supplied from the first assist gas passage 34, and then the medium is supplied from the second assist gas passage 36. The assist gas is conveyed to the jet nozzle N through the media supply passage 22.

As shown in FIG. 4, the twelve supply chambers 32 are connected to the media supply passages 22, respectively. The media supply passages 22 are respectively connected to a main passage 22 a connected to the supply chamber 32 and the main passages. Each branch passage 22b is provided with an opening / closing valve 41 as a switching means.
In the media supply passage 22 connected to the first to third supply chambers 32 counted from the left end in the figure, the branch passages 22b are connected to the right bottom nozzle NBR, the right side nozzle NSR, and the right top nozzle NUR, respectively. Has been.
Similarly, in the media supply passage 22 connected to the fourth to sixth supply chambers 32 counted from the left end in the figure, the branch passages 22b are the right bottom nozzle NBR, front nozzle NF, and right top nozzle, respectively. Connected to NUR.
In the media supply passage 22 connected to the supply chamber 32 located at the seventh to ninth positions from the left end in the figure, the branch passages 22b are connected to the left bottom nozzle NBL, the left side nozzle NSL, and the left top nozzle NUL, respectively. Has been.
In the media supply passage 22 connected to the supply chamber 32 located 10th to 12th from the left end in the figure, the branch passages 22b are connected to the left bottom nozzle NBL, the rear nozzle NR, and the left top nozzle NUL, respectively. Has been.
That is, in the above combination, the branch passages 22b constituting one media supply passage 22 are not connected to the injection nozzles N belonging to the same group.

A conventionally known pinch valve can be used as the opening / closing valve 41 as the switching means, and the opening / closing of the pinch valve is controlled by allowing compressed air to enter and exit from the control means. ing.
The control means simultaneously opens the opening / closing valve 41 of the branch passage 22b corresponding to the injection nozzles N belonging to the same group, so that the medium is supplied to the injection nozzles N belonging to the same group.
At that time, since the injection nozzles N belonging to the same group are not connected to one medium supply passage 22, only the opening / closing valve 41 of any one of the branch passages 22b is opened.
In other words, the media is not supplied to the plurality of branch passages 22b at the same time in one media supply passage 22, and the flow rate of the media due to the supply of media from the one media supply passage 22 to the plurality of branch passages 22b. There is no shortage.

Hereinafter, an operation of switching and supplying the medium to the injection nozzles N belonging to a required group using the opening / closing valve 41 will be described taking a case where the bottom surface of the carriage 2 is washed as an example.
In the first to sixth media supply passages 22 counted from the left end in the figure, the control means opens the opening / closing valve 41 of the branch passage 22b corresponding to the right bottom nozzle NBR, and the seventh to twelfth media supply passage 22 has the left bottom surface. The open / close valve 41 corresponding to the nozzle NBL for use is opened.
As a result, the medium is ejected from the twelve bottom surface nozzles NB constituted by the left bottom surface nozzle NBL and the right bottom surface nozzle NBR to the bottom surface of the carriage 2.
At this time, in the first to twelfth media supply passages 22, the opening / closing valve 41 corresponding to the top surface nozzle NU is closed, and the medium sprayed from the bottom surface nozzle NB is ejected from above. Is not attenuated.
In the present embodiment, the right side surface and the left side surface of the carriage 2 as well as the front surface and the rear surface are simultaneously cleaned. In this case, the first to third media supply passages 22 counted from the left end in the drawing show the right side surface. The opening / closing valve 41 corresponding to the nozzle NSR is opened, the opening / closing valve 41 corresponding to the front nozzle NF is opened in the fourth to sixth media supply passages 22, and the left side surface is used in the seventh to ninth media supply passages 22. The opening / closing valve 41 corresponding to the nozzle NSL is opened, and the opening / closing valve 41 corresponding to the rear surface nozzle NR is opened in the 10th to 12th media supply passages 22.

As shown in FIG. 1, the spray nozzles N belonging to each group are integrally held, and the spray nozzles N of each group are moved integrally by the moving means 4.
As shown in FIG. 2, the top nozzle NU is movable back and forth along a slide rail 4a provided in parallel with the rail 13 above the carriage 2, and the bottom nozzle NB is arranged on the carriage. 2 is movable back and forth along a slide rail 4a provided below 2.
Although not shown in FIG. 2, the side nozzle NS is also movable back and forth along the slide rail 4 a provided on the side of the carriage 2.
The front nozzle NF and the rear nozzle NR can be moved to the left and right with respect to the carriage 2 by a slide rail 4 a provided above the carriage 2 and orthogonal to the rail 13.

The injection nozzles N of each group move the slide rail 4a by driving means such as a servo motor (not shown), and the control means can control the driving means to change the moving speed. Yes.
For the bottom surface nozzle NB that cleans the bottom surface of the carriage 2, assuming that the distance between the injection hole of the bottom surface nozzle NB and the center frame 11 a is a distance that can be optimally processed by the bottom surface nozzle NB, At the position where the wheel 12 is provided on the bottom surface of the carriage 2, since the lower end portion of the wheel 12 protrudes downward from the center frame 11a, the surface to be ejected approaches the injection hole of the bottom surface nozzle NB. ing.
When the injection holes of the injection nozzle N are close to each other in this way, the amount of collision per unit area of the medium injected from the bottom nozzle NB is large, and the injection force of the injected air is high. However, there is a risk of peeling even a coating that does not need to be peeled off.
Conversely, at the position between the wheel 12 and the center frame 11a on the bottom surface of the carriage 2, the unit area of the ejected media is separated from the ejection holes of the bottom surface nozzle NB with respect to the distance to the center frame 11a. Since the hit amount is small and the air injection force is attenuated, a high cleaning power may not be obtained.
Therefore, when the moving means 4 moves the bottom nozzle NB from the front end to the rear end of the carriage 2 at the same speed, excessive cleaning is performed at the position where the wheel 12 is provided, and the wheel 12 and the center frame In the position between 11a, cleaning is insufficient, and cleaning unevenness may occur.

In order to deal with such a problem, in the present embodiment, each position of the bottom surface of the carriage 2 is divided into five sections according to the distance from the bottom surface nozzle NB to the injection hole. The moving speed of the bottom nozzle NB is changed for each section.
First, the distance between the injection hole of the bottom nozzle NB and the center frame 11a is set as a reference value, and the moving speed of the bottom nozzle NB with respect to the section N in which the center frame 11a is provided is set as the reference speed.
On the other hand, in the section F where the wheel 12 is located where the distance from the injection hole of the bottom nozzle NB is shorter than the reference value, the moving speed of the bottom nozzle NB is set to be higher than the reference speed. By passing through the section F, peeling of the painted surface is prevented.
On the other hand, in the section S between the wheel 12 and the center frame 11a, where the distance is longer than the reference value, the moving speed of the bottom nozzle NB is set to a low speed, and the ejection of media from the bottom nozzle NB is attenuated. However, a good cleaning result can be obtained.
When the distance between the injection hole and the wheel 12 varies with the movement of the bottom surface nozzle NB as in the section F, the movement speed of the injection nozzle N in the section F is gradually changed to change the bottom surface nozzle. It can also be set so that the moving speed at the position that protrudes most toward the NB side is the highest.
And the section which set the moving speed of each injection nozzle N by such a moving means 4 can be set according to the state of each injection | pouring surface of the top | upper surface other than a bottom face, both sides | surfaces, and a front surface and a rear surface. .
In addition, in the case where accessory parts such as the drive motor are mounted on the carriage 2, in the case where these accessory parts are likely to be deformed / deteriorated or damaged or damaged due to the ejection of the media, in order to avoid them, It is desirable not to eject the media to the place where the accessory is mounted.
In that case, a section in which the accessory is provided is set separately, and the movement speed of the bottom surface nozzle NB is set to be higher than the reference speed for the section, and an excessive amount to the accessory is set. Media ejection can be suppressed.
At that time, in the above embodiment, the moving speed of the injection nozzle N is set to be higher or lower than the reference speed. However, the moving speed of each section can be varied according to the state of the injection target surface. It is.

As shown in FIG. 1, the media recovery means 7 includes a recovery cup 51 provided at the bottom of the cleaning chamber 3, a media recovery passage 52 connected to the recovery cup 51, and a large foreign matter provided in the media recovery passage 52. A foreign matter removal filter 53 for removing the foreign matter, a media supply tank 54 for replenishing the media, two cyclones 55 for separating foreign matter from the used media, and a dust collecting device 56 for collecting the foreign matter separated by the cyclone 55 Has been.
The medium ejected from the ejection nozzle N falls below the cleaning chamber 3 due to its own weight, and is collected by the taper portion 3a formed below the cleaning chamber 3, and then collected by the collection cup 51. At that time, in addition to the used media, foreign matters such as iron powder stains and dust stains attached to the carriage 2 are also collected.
The media recovery passage 52 is disposed between the recovery cup 51 and the cyclone 55, and when the cyclone 55 is activated, the media of the recovery cup 51 is recovered to the cyclone 55, and at this time, the particle size of the foreign matter is reduced. Are removed by the foreign matter removal filter 53.
Further, the media supply tank 54 provided in the media recovery passage 52 is configured to replenish the reduced media collected during the cleaning, the foreign matter removal filter 53 and the dust collecting device 56.
When the used media reaches the cyclone 55 in this way, the used media is separated into reusable media and dust in the cyclone 55, and the usable media falls to the media supply means 6, The dust is collected by the dust collector 56.

Hereinafter, the operation of the blasting apparatus 1 having the above configuration will be described.
First, when the operator moves the carriage 2 along the rail 13 to the inside of the cleaning chamber 3, the stopper 14 positions the carriage 2 at a required position, and then the open / close door 3b is closed.
Subsequently, the carriage 2 is cleaned by ejecting media from the injection nozzle N. In this embodiment, both side surfaces and front and rear surfaces of the carriage 2 are first cleaned, and then the bottom surface of the truck 2 is cleaned. The top surface of the carriage 2 is cleaned. Note that this order can be changed as appropriate.
The right side nozzle NSR and the left side nozzle NSL are positioned in front of or behind the carriage 2 by the moving unit 4 in advance, and the front side nozzle NF and the rear side nozzle NR are also moved to the right side of the carriage 2 by the moving unit 4. Located on the left or left side.

From this state, the air supply means 5 and the medium supply means 6 supply air and media to the right side nozzle NSR, the left side nozzle NSL, the front side nozzle NF, and the rear side nozzle NR.
More specifically, in each branch passage 22b of the 12 media supply passages 22 connected to the media supply means 6, the right side nozzle NSR, the left side nozzle NSL, the front side nozzle NF, and the rear side nozzle NR. The opening / closing valve 41 corresponding to is opened, and the opening / closing valves 41 corresponding to the other injection nozzles N are closed.
On the other hand, the control means moves the right side nozzle NSR and the left side nozzle NSL at a moving speed corresponding to the section set in advance for the side surface of the carriage 2, and similarly, the front side nozzle NF and the rear side nozzle The nozzle NR is also moved at a moving speed corresponding to each section.
As a result, the right side nozzle NSR, the left side nozzle NSL, the front side nozzle NF, and the rear side nozzle NR move while the medium is ejected, so that both sides, the front side, and the rear side of the carriage 2 are cleaned. . Further, since each of the spray nozzles N moves at a predetermined moving speed for each section set in advance according to the surface to be ejected, these surfaces to be ejected are cleaned evenly.
The ejected media is collected below the cleaning chamber 3 and then collected by the media collection means 7, and the reusable media is reused by the media supply means 6.
Thereafter, the control means sprays the medium onto the bottom surface of the carriage 2 using the bottom surface nozzle NB, and then sprays the medium onto the top surface of the carriage 2 using the top surface nozzle NU. Clean the surface with media.
When the cleaning of the medium is completed in this way, the control means moves each of the injection nozzles N again in the above-described order, and at that time, only the air from the air supply means 5 is supplied to the injection nozzle N, and the injection nozzle The medium adhering to the carriage 2 is removed by the air jetted from N.

In the above embodiment, the carriage 2 is fixed on the rail 13 and the moving means 4 moves the injection nozzle N. However, the injection nozzle N may be fixed and the carriage 2 may be moved. In the above-described embodiment, the moving means 4 integrally moves, for example, the twelve bottom surface nozzles NB, but these can also be moved individually.
Further, in the above embodiment, the 12 media supply passages 22 are connected to the media supply means 6, and the open / close valve 41 as the switching means is provided in each branch passage 22 b of the media supply passage 22. For example, it is possible to change to another flow path switching valve such as a three-way valve or a four-way valve.
As for the media supply passage 22, the same number of the media supply passages 22 as the injection nozzles N 36 are provided, which are directly connected to the media supply means 6, and an open / close valve 41 is provided in each media supply passage 22. Is also possible.
Also in this case, if the control means opens only the open / close valve 41 corresponding to the injection nozzle N belonging to the required group and shuts off the open / close valve 41 corresponding to the injection nozzle belonging to the other group, Similar cleaning can be performed.

DESCRIPTION OF SYMBOLS 1 Blast processing apparatus 2 Carriage 3 Washing chamber 4 Moving means 5 Air supply means 6 Media supply means 7 Media collection means 22 Media supply path 22a Main path 22b Branch path 41 Opening and closing valve N Injection nozzle NU Top surface nozzle NB Bottom surface nozzle NS Side nozzle NF Front nozzle NR Rear nozzle

Claims (3)

In a blasting apparatus comprising a supply means for supplying media, a media supply passage connected to the supply means for circulating the media, and an injection nozzle provided at the tip of the media supply passage for injecting the media,
A plurality of the media supply passages are provided, and the respective media supply passages are connected to the supply means via switching means,
Further, the plurality of spray nozzles are classified into a plurality of groups, and the switching unit communicates the media supply passage corresponding to the required group of spray nozzles with the supply unit, and supplies the media corresponding to the spray nozzles of other groups. A blasting apparatus for ejecting media from an ejection nozzle belonging to the required group by blocking communication between the passage and the supply means. The media supply passage is constituted by a main passage connected to the supply means, and a branch passage branched into a plurality from the main passage and provided with the injection nozzle at the tip.
Connecting the main passages of the plurality of media supply passages to the supply means, and classifying the injection nozzles corresponding to the branch passages in the respective media supply passages into different groups,
The switching means causes only the branch passages corresponding to the ejection nozzles of a required group in each media supply passage to communicate with the supply means, and ejects the media from the ejection nozzles belonging to the required group. The blasting apparatus according to 1. The switching means is constituted by an open / close valve provided in each branch passage,
By opening only the open / close valves of the branch passages corresponding to the injection nozzles of the required group and closing the open / close valves of the branch passages corresponding to the injection nozzles of the other groups, it is possible to remove media from the injection nozzles belonging to the required group. The blasting apparatus according to claim 2, wherein the blasting apparatus is jetted.

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