JP2001212761A - Aeration type hopper integrated blast gun and vertical blast processing device equipped with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blast gun and a blast cleaning device suitable for automating blast cleaning of a gravuer cylinder or the like. SOLUTION: The blast cleaning device 10 is equipped with a vertical blast cleaning chamber 12 to dispose a pair of printing cylinders 14 in left and right. A grinding material is sprayed from a blast gun 28 while rotating work 14 and moving the blast gun 28 in a vertical direction. The blast gun 28 is equipped with an integral aeration type hopper to perform aeration to grinding material particles stored in the hopper. The aeration stabilizes an injection quantity of the blast gun 28.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blasting machine for spraying abrasive particles dispersed in a gas onto a surface of a workpiece to perform cleaning, polishing, grinding and other surface treatments, and a blast gun therefor. The present invention particularly relates to a blast device suitable for cleaning a gravure printing cylinder and the like and a blast gun thereof.

[0002]

2. Description of the Related Art Very fine depressions called cells are formed in a printing cylinder (printing roll) of a gravure printing machine, and the printing cylinder is periodically rotated to remove solid ink clogged in the cells. Must be cleaned. Conventionally, cleaning of the gravure printing cylinder
It is carried out using a solvent such as toluene, but this kind of solvent is harmful to the human body, including carcinogenicity, and the exhaust requires pollution control measures. Therefore, it is desirable to clean the gravure printing cylinder by blasting (blasting) abrasive particles or powder harmless to the human body such as baking soda.

A conventional blasting machine uses a suction-type blast gun as shown in FIG. The blast gun includes a primary air injection nozzle 2 opposed to a cleaning material injection nozzle 1, and injects compressed air from the primary air injection nozzle 2 toward the cleaning material injection nozzle 1 to cause a suction chamber by the principle of an ejector. 3, a negative pressure is generated. The cleaning material powder stored in the hopper 4 is sucked toward the suction chamber 3 through the cleaning material suction hose 5 by the negative pressure generated in the suction chamber 3, and is entrained with air by the principle of pneumatic transport. It is transported from the hopper 4 to the suction chamber. The abrasive material sucked into the suction chamber 3 is accelerated by the compressed air injected from the primary air injection nozzle 2, and a mixture of the abrasive material and air is injected from the abrasive material injection nozzle 1 toward the workpiece. Is done.

[0004]

A first problem of the blasting apparatus using the suction type blast gun is that a "plug conveyance" phenomenon occurs in the abrasive suction hose 5. More specifically, when air is conveyed to the blast gun through the cleaning material suction hose 5 using negative pressure suction, the carrier flow flowing through the cleaning material suction hose 5 is apparently Is a mixture of powder and air. However, the negative pressure generated by the blast gun is weak,
While flowing through the hose, solid-gas separation occurs in the transport flow (flow of the mixture of powder and air), and powder accumulation (called a plug) occurs locally in the hose. The resulting plug intermittently blocks the hose, resulting in a pulsation in the transport stream. Such a transport state is called “plug transport”.

When "plug conveyance" occurs in the abrasive suction hose and pulsation occurs in the conveying flow, the abrasive is ejected from the blast gun at once, or the amount of the ejected abrasive is reduced. The spray amount (powder concentration) of the abrasive particles sprayed from the gun becomes unstable, and the spray width also becomes uneven. Such variations in the injection amount and the injection width can be compensated to some extent in the case of manual cleaning in which an operator operates a blast gun while monitoring the degree of cleaning of a workpiece. If it is desired to automate the cleaning work, etc., it becomes an obstacle to automation. This is because, in order to automate the cleaning work, it is necessary to keep the injection nozzle feed (nozzle scanning speed or cylinder rotation speed) constant as a prerequisite. It must be constant. If the powder concentration varies, adjust the feed speed of the injection nozzle to a mixture with a low abrasive concentration, and when a rich mixture is injected, the grinding capacity will be excessive, forming on the surface of the gravure printing cylinder. The damaged nickel plating layer will be damaged. This degrades the life of the printing cylinder. Conversely, if the injection nozzle feed rate is adjusted to a rich mixture, cleaning will be inadequate when a thin mixture is ejected, and cleaning will need to be repeated.

The second problem of the suction type blast gun using the above-described ejector and pneumatic transport principle is that the jetting amount of the abrasive (the concentration of the abrasive in the jet) is small and the cleaning ability (cleaning ability) is low. ) Is not sufficient, so that it takes time to clean the gravure printing cylinder and blast the workpiece. The reason is that in order to pneumatically transport the abrasive from the hopper 4 to the suction chamber 3 via the abrasive suction hose 5 according to the principle of pneumatic transport, the gas-solid ratio (powder) Ratio of air to body)
Must be secured to a predetermined value or more (reducing the ratio of air to powder will make pneumatic transport of the powder impossible), but increasing the gas-solid ratio in this way will cause the hopper to blast gun This is because the powder supply amount (flow rate) is restricted.

Another problem with this suction blast gun is that
As described above, in order to suck the abrasive from the hopper 4, the gas-solid ratio of the transport stream must be increased, and a large amount of compressed air is required. It is.

Still another problem with the suction blast gun of the prior art is that powders such as baking soda can be degassed (solid-gas separation) by their own weight and can easily form a bridge in the hopper 4. . When a bridge is formed in the powder in the hopper 4, the supply of the abrasive material to the blast gun stops, so that the printing cylinder cannot be cleaned.

An object of the present invention is to provide a blast gun and a blast processing apparatus which have a stable jetting amount of the abrasive and are suitable for automating blast processing. It is another object of the present invention to provide a blast gun and a blast processing apparatus that have a large amount of abrasive material to be sprayed and have excellent cleaning ability or blast processing ability. It is another object of the present invention to provide a blast gun and a blast processing device that consume less compressed air.

[0010]

SUMMARY OF THE INVENTION A blast gun according to the present invention has an aeration type hopper having means for performing aeration on a charged powdery abrasive material, and receives an abrasive material falling from the hopper. A bottomed cylindrical main body connected to the bottom of the hopper, and a polishing material injection nozzle arranged on the side wall of the main body and pointing outward from the inside of the main body,
A primary air injection nozzle disposed opposite to the cleaning material injection nozzle.

As described above, in the blast gun of the present invention, since the hopper has the aeration means, the aeration is performed on the powder stored in the hopper. In this way, the abrasive powder in the hopper is subjected to aeration, so that the abrasive powder does not form a bridge in the hopper, and the powder falls smoothly from the hopper to the gun body by the action of gravity. , At the injection nozzle. In addition, the blast gun of the present invention has a hopper-integrated structure, and since the abrasive is directly supplied from the hopper into the gun body by gravity without being transported by air, the blast gun has a structure similar to that of a suction blast gun. There is no danger of the occurrence of unusual plug transport. from these things,
The supply amount of the abrasive powder from the hopper to the injection nozzle of the blast gun is stabilized. As a result, the injection amount of the abrasive material injected from the injection nozzle is stabilized, so that the blast gun according to the present invention can automate the blast processing.

Furthermore, unlike the case of the suction type blast gun of the prior art, the blast gun of the present invention is different from the case where the abrasive powder must be pneumatically transported while being suspended in a sufficient amount of air. In, the abrasive is supplied from the hopper to the main body by gravity, so that the abrasive powder can be supplied to the injection nozzle in a sufficiently high density and high concentration state. Therefore, since the amount of the abrasive material sprayed from the spray nozzle increases, the processing capacity (cleaning capacity and processing speed) can be increased. Also,
Compressed air consumption is minimized because no compressed air is required to transport the powder from the hopper to the blast gun.

In a preferred embodiment, the abrasive jet has a divergent orifice. If the abrasive material spray nozzle has such a diffusion nozzle structure, since the penetration force of the abrasive material sprayed from the spray nozzle becomes weaker as the distance from the spray nozzle of the gravure printing cylinder which is the workpiece increases, Excessive grinding of the nickel plating layer on the printing cylinder surface can be prevented.

In another aspect of the present invention, the present invention provides a vertical blasting apparatus, comprising: a substantially closed vertical blasting chamber having an access window; Support means for positioning an elongated workpiece in a blast processing chamber in a vertical position, a carriage mounted with a blast gun, and driving means for driving the carriage so that the blast gun moves up and down along the surface of the workpiece. And Preferably, the above-described blast gun integrated with the aeration hopper of the present invention is used as the blast gun.

This vertical blasting apparatus has a number of advantages as compared with a conventional blasting apparatus in which a workpiece is horizontally supported. First, by arranging a plurality of workpieces (print cylinders) held in a vertical position side by side, it becomes possible to wash a plurality of cylinders at the same time. Therefore, in a preferred embodiment of the present invention, the workpiece support means is configured to be able to support a plurality of workpieces arranged side by side, and the carriage has a plurality of blast guns corresponding to the plurality of workpieces. It is installed. On the other hand, if the workpiece is placed horizontally as in a conventional blasting machine, it is difficult to place another printing cylinder behind the front printing cylinder. Therefore, only one cylinder can be blasted at a time.

A second advantage is that the setting (attachment) of the workpiece is easy. Since a workpiece such as a gravure printing cylinder is a heavy object, in the case of a horizontal blasting apparatus, the workpiece must be set while rolling with a ruggedness, but in the case of the vertical blasting apparatus of the present invention. Then, the loading and unloading of the cylinder into and out of the blasting chamber and the mounting and dismounting of the cylinder can be easily performed by using a hoist mechanism such as an air-type balancer.

This vertical blasting apparatus further includes:
(1) Since the components such as the guide rail of the carriage take a vertical position, the area and the place where the powder is accumulated are reduced, so that the powder is less likely to accumulate on the sliding portion (prevention of accumulation of the powder).
(2) The abrasive material can be supplied to the hopper of the blast gun by the gravity drop method, and (3) the installation area of the apparatus can be reduced.

In a preferred embodiment, a dust collecting hopper is provided at the bottom of the blasting chamber for collecting the abrasive material dropped on the blasting chamber, and the abrasive material collected by the dust collecting hopper is pneumatically transported. Automatically pneumatically transported to blast gun hopper. In a further preferred embodiment, to prevent dust from leaking to the outside,
A blower for sucking air in the blasting chamber and a dust collector (cyclone or filter device) for capturing dust floating in the air sucked by the blower are provided.
Preferably, the dust collecting hopper provided at the bottom of the blast processing chamber includes aeration means, and the exhaust of the blower is sent to the aeration means of the dust collecting hopper. If the aeration means of the dust collection hopper is operated by effectively utilizing the exhaust air of the blower, the amount of compressed air consumed by the apparatus can be suppressed to a minimum.
The above-described features and effects of the present invention, as well as other features and effects, will be further clarified as described in the following examples.

[0019]

FIG. 2 shows a vertical blasting machine according to the simplest embodiment of the present invention. Referring to FIG. 2, the vertical blasting apparatus 10 includes a substantially closed blasting chamber (washing chamber) 12 formed of a stainless steel plate or the like and having a substantially cylindrical shape.
2 has a transparent access window 16 which can be opened or closed by sliding.
An opening provided with an opening is formed so that a workpiece such as a gravure printing cylinder 14 to be cleaned can be carried into or out of the blasting chamber 12.

The gravure printing cylinder 14 as a workpiece (hereinafter, also simply referred to as a workpiece) includes a workpiece rotating mechanism 1.
The upper and lower spindles 8 are rotatably supported by a pair of upper and lower spindles 20. A known ball screw type vertical sliding mechanism 26 comprising a vertical guide rail 22 and a sliding carriage 24 is provided on the side of the workpiece 14 positioned in the blasting chamber 12. A blast gun 28 is mounted so as to be able to move integrally. The guide rail 22 is supported by a hydraulic cylinder 30 that expands and contracts in the front-back direction in order to adjust the front-back position of the blast gun 28 with respect to the work 14. With such a configuration, the blast gun 28 can be positioned at a predetermined distance from the cylindrical surface of the work 14, and the blast gun 28 can be moved up and down along the work surface while rotating the work.

The blast gun 28 has a bottomed cylindrical main body 32.
And an aeration type (air blowing type) hopper 34 integrally connected thereto. As can be clearly understood from FIG. 3, an abrasive spray nozzle 38 is attached to the side wall 36 of the blast gun main body 32 by screwing or welding. The cleaning material injection nozzle 38 is provided with the enlarged inlet 4.
It has an orifice 42 that is zero and divergent. At a position facing the injection nozzle 38, a primary air injection nozzle 44 is mounted on the side wall 36 coaxially with the axis of the injection nozzle 38. The primary air injection nozzle 44 is attached to the side wall 36 by screwing into a sleeve 46 welded to the side wall 36 of the body 32 to adjust the distance between the inlet 40 of the injection nozzle 38 and the tip of the primary air injection nozzle 44. I can do it. The primary air injection nozzle 44 is connected to a compressed air source by a compressed air hose (not shown).

The hopper 34 can be composed of a conical portion 48 and a cylindrical portion 50. As shown in FIG. 4, the conical portion 48 has a conical outer wall 52 formed of a stainless steel plate or the like.
The outer wall 52 is lined with an air-permeable lining 54 made of a microporous resin. The outer wall 52 and the air-permeable lining 54 are radially spaced apart and define an annular conical air-filled chamber 56 therebetween. Both ends of the air-filled chamber 56 are packed 58 and 6
0 is hermetically sealed. The outer wall 52 is provided with a compressed air inlet 64 to which a compressed air hose 62 from a compressed air source is connected so that compressed air is blown into the air filling chamber 56. The air permeable lining 54 and the air filling chamber 56 constitute an aeration mechanism 66.

Next, the operation and use of the blasting machine 10 will be described. The access window 16 is opened, and the gravure printing cylinder 14 to be cleaned is fixed to the spindle 20 of the work rotating mechanism 18 in a vertical position. A powdery abrasive (for example, baking soda powder) is charged into the hopper 34 of the blast gun 28, and compressed air is sent to the air filling chamber 56 of the hopper 34 to operate the aeration mechanism 66.
The compressed air pumped into the air-filled chamber 56 passes through the microporous air-permeable lining 54 and flows into the inside thereof, and the abrasive powder in the hopper 34 is aerated. Thus, the abrasive powder is dropped and supplied to the main body 32 of the blast gun 28 without forming a bridge.

When the blast gun 28 is positioned at an appropriate position with respect to the workpiece by operating the vertical sliding mechanism 26 and the hydraulic cylinder 30, and supply of compressed air to the primary air injection nozzle 44 of the blast gun 28 is started. The compressed air injected from the primary air injection nozzle 44 is injected from the injection nozzle 38 toward the surface of the printing cylinder 14 while entraining the abrasive material powder, and cleans the printing cylinder 14. Since the injection port 42 of the injection nozzle 38 has a divergent diffusion nozzle shape, the blast of the abrasive material is
Loses energy rapidly as you move away from it. Therefore,
By controlling the hydraulic cylinder 30 to appropriately manage the distance between the injection nozzle 38 and the work surface, the polishing ability can be controlled to a desired level. The jet pattern can be adjusted by changing the distance between the injection nozzle 38 and the primary air injection nozzle 44.

The cleaning of the printing cylinder 14 by spraying the abrasive material is performed by the vertical sliding mechanism 26 on the blast gun 2.
8 is reciprocated up and down, and the printing cylinder 14 is rotated by the work rotating mechanism 18. As the abrasive material in the main body 32 of the blast gun 28 is consumed with the injection from the injection nozzle 38, the abrasive material in the hopper 34 falls into the main body 32, and the primary air injection nozzle 44 and the injection nozzle 38 Supplied during. The powder present between the primary air injection nozzle 44 and the injection nozzle 38 has only been aerated by the aeration mechanism 66 and is not diluted with excess air, and therefore exists at a sufficient density. Therefore, the blast injected from the injection nozzle 38 has a high concentration of abrasive material and has a high abrasive ability. When cleaning is completed, access window 1
6 is opened, the work is taken out, and the next work is mounted if necessary.

FIGS. 5 and 6 show a vertical blasting machine according to a second embodiment of higher performance. The features of the second embodiment are that two workpieces can be blasted at the same time, means for facilitating the loading and unloading of the workpieces are provided, and efficient processing of dust is enabled. That is. In FIGS. 5 and 6, components having the same functions as those of the first embodiment are denoted by the same reference numerals, and overlapping description will be omitted. In the following, only the differences will be described.

Referring to FIGS. 5 and 6, in this blasting apparatus 10, the blasting chamber 12 is disposed inside a larger housing 70. Inside the housing 70, a cyclone dust collector 72, a filter type dust collector 74, and a blower 76 are also housed. A control panel 78 is mounted on the front of the housing 70, and a conventional air balancer 80 and a vacuum conveyor 82 are mounted on a top plate of the housing 70.
Is installed. The air balancer 80 is a hoist mechanism for suspending a heavy work, and can suspend the work with a force equal to the weight of the work using compressed air.

The cylindrical blasting chamber 12 is inscribed in the cylindrical front part of the housing 70. In the area of the inscribed portion, the blasting chamber 12 and the housing 70 are provided with access openings, respectively. These access openings are simultaneously opened and closed by a common access window 16. In order to allow the work suspended by the air balancer 80 to be carried in and out of the blasting chamber 12, a part 86 of the top plate of the housing 70 is separated into a fan shape,
This sector 86 is integrally connected to the access window 16. Fan-shaped part 86 which constitutes a part of the top plate of housing 70
The access window 16 which is integrally provided with is provided with a hinge 84 so as to be openable and closable on the housing 70.

In the second embodiment, the blasting chamber 12
The work rotating mechanism 18 disposed therein has two pairs of spindles 20 arranged side by side so that the two printing cylinders 14 can be mounted in the blasting chamber 12 side by side. 2 supported by the work rotating mechanism 18
Two blast guns 28 are mounted on the sliding carriage 24 of the vertical sliding mechanism 26 for each of the books. The blast gun 28 is the same as the blast gun of the first embodiment described above with reference to FIGS. 3 and 4, and aerates the abrasive material in the hopper 34.

Each of the blast guns 28 is circulated and supplied with the abrasive material collected by the cyclone dust collector 72. For this reason, as can be clearly understood from FIG.
The outlet 2 is connected to a vacuum conveyor 82 by a pneumatic transport pipe 88, and a screw feeder 90 is provided at the outlet of the vacuum conveyor 82 as a powder fixed quantity cutting device. The outlet of the screw feeder 90 is connected to the hopper 34 of the blast gun 28 by a bellows tube 92 which can expand and contract according to the vertical movement of the blast gun 28, for example.

The blasting chamber 12 is connected to an air intake of the cyclone dust collector 72 by a duct 94 opening into the blasting chamber 12 and sucks air accompanied with dust generated in the blasting chamber 12 to clean coarse particles. It is designed to separate the materials. As can be clearly understood from FIG. 6, the cyclone dust collector 72 is further connected to a filter-type dust collector 74 so as to separate and collect finer powder. The outlet of the filter type dust collector 74 is connected to the air suction port of the blower 76, and the negative pressure generated by the blower 76 causes the dust in the blast processing chamber 12 to pass through the duct 94 to the cyclone dust collector 72 and the filter type dust collector 74. It is designed to be sucked.

On the other hand, a hopper 96 for collecting powder (dust collecting hopper) is provided at the bottom of the blasting chamber 12 so as to collect the abrasive material settled and dropped in the blasting chamber 12. In order to allow the abrasive material to smoothly fall along the conical inner wall of the hopper 96 and be collected, the powder collecting hopper 96 has an aeration structure having the same principle as the aeration type hopper 34 of the blast gun 28. It has an air permeable lining 98 for blowing air and an air filled chamber. Air permeable lining 98
Has a large air ejection area and thus requires a large amount of working air. In order to suppress the consumption of compressed air in the entire blasting device 10, the powder recovery hopper 96 performs aeration using the exhaust air of the blower 76. For this reason, as shown in FIG. 6, the outlet of the blower 76 is connected to the air filling chamber of the hopper 96 for collecting powder.
The outlet of the powder collecting hopper 96 is connected to the inlet of the cyclone dust collector 72 by a pipe 102 (FIG. 6) provided with a valve 100.

With further reference to FIG. 6, a compressed air source such as an air compressor 104 is provided for each blast gun 2.
8 are connected to a primary air injection nozzle 44 and an air filling chamber 56 to supply compressed air to them. The compressed air is also sent to an ejector (not shown) of the vacuum conveyor 82 and an air balancer 80.

Since the blast processing apparatus of the second embodiment has such a structure, the two printing cylinders 14 can be cleaned at the same time. To mount the work, the print cylinder 14 to be cleaned is hung from the wire 106 of the air balancer 80 (FIG. 6), the access window 16 is opened, and the print cylinder 14 is positioned in the blasting chamber 12 by manually operating the print cylinder 14. I do. Since the air balancer 80 lifts the work with the same force as the weight of the work, the operator can easily position the work and mount it on the work rotating mechanism 18. Two printing cylinders 1
When the setting of the blower 7 is completed, the access window 16 is closed.
6 to start the exhaust of the air in the blasting chamber 12 and to operate the vacuum conveyor 82.

Next, the blast gun 28 is positioned at a desired distance with respect to the work by adjusting the guide rail 22 back and forth, and then the two blast guns 28 are vertically reciprocated by the vertical sliding mechanism 26. While the printing cylinder 14 is being rotated by the work rotating mechanism 18, the blast gun 28 ejects the abrasive material to clean the printing cylinder 14. As in the first embodiment, the abrasive is sprayed by sending compressed air to the air filling chamber 56 of the aeration hopper 34 of each blast gun 28 while aerating the powder.

During the cleaning operation, the blast processing chamber 1
The dust generated in 2 is sucked into a blower 76 through a duct 94 together with air, and passed through a cyclone dust collector 72 and a filter type dust collector 74. Blast processing room 12
The abrasive material that has settled in the powder recovery hopper 96 at the bottom is sent to the cyclone dust collector 72 by opening the valve 102 as necessary. In the cyclone dust collector 72, the coarse abrasive material is separated from the air and settles to the bottom. The sedimented abrasive particles are sucked into the vacuum conveyor 82 via the air transport pipe 88. The abrasive material sent to the vacuum conveyor 82 is cut out by a screw feeder 90 at a predetermined supply amount, and is returned to the hopper 34 of the blast gun 28 via a bellows tube 92.

The filter type dust collector 74 separates the finely ground abrasive material that has not been separated by the cyclone dust collector 72 from the ink residue removed from the printing cylinder 14. Since the finely crushed abrasive has poor cleaning ability, it can be discarded together with the ink residue. When the cleaning of the cylinder is completed, the work is taken out by opening the access window 16 and the next work is mounted as required.

[0038]

EXAMPLE A conventional blast gun shown in FIG. 1 and a blast gun 28 integrated with an aeration type hopper of the present invention shown in FIG. The original pressure of the compressed air supplied to the primary air injection nozzle 2 is 6 kg / cm2
Met. A conventional blast gun was supplied with abrasive material via an abrasive material suction hose 5 as shown in FIG. The pressure of the aeration air supplied to the blast gun 28 of the present invention was 0.5 kg / cm2. The spray amount of the abrasive material in the spray test for 20 seconds was 136 g on average with the conventional blast gun, but was 420 g on average with the aeration type hopper integrated blast gun of the present invention. As can be seen from the results, according to the aeration type hopper-integrated blast gun of the present invention, it was possible to spray the abrasive at a concentration three times that of the conventional blast gun. In the conventional blast gun, the concentration of the abrasive material in the jet flow was significantly uneven, whereas in the blast gun of the present invention, the abrasive material was jetted at a stable concentration.

Although a specific embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications and changes can be made. For example, by using a robot in place of the air balancer 80 for positioning the work, the cleaning operation can be completely automated. Also, the supply of the abrasive material to the aeration hopper of the blast gun can be performed by any other type of conveyor or feeder. In addition, although the above describes the use example of spraying an abrasive onto a workpiece for the purpose of cleaning, it goes without saying that the blast gun and the blast apparatus of the present invention can be used for polishing, grinding, removing rust and other surface treatments. .

[Brief description of the drawings]

FIG. 1 is a sectional view showing a state where a conventional blast gun is connected to a hopper.

FIG. 2 is a cross-sectional view schematically showing a vertical blasting machine according to a first embodiment of the present invention.

FIG. 3 is a partially cutaway side view of a blast gun of the blast processing device shown in FIG. 2;

FIG. 4 is an enlarged cross-sectional view of a part shown by broken lines A and B in FIG.

FIG. 5 is a perspective view of a vertical blasting apparatus according to a second embodiment of the present invention, in which an upper spindle of a work rotating mechanism is omitted for simplification of the drawing.

6 is a system diagram of the blast processing device shown in FIG.

[Explanation of symbols]

 10: Vertical blasting machine 12: Blasting chamber 14: Workpiece (gravure printing cylinder) 16: Access window of blasting chamber 18: Work supporting means (Work rotating mechanism) 24: Carriage 26/30: Carriage driving means 28: Blast gun 32: Blast gun main body 34: Blast gun aeration type hopper 38: Abrasive material injection nozzle 42: Injection nozzle injection outlet 44: Primary air injection nozzle 66: Aeration means 72: Cyclone dust collector 74: Filter type dust collector 76: Blower 80: Hoist mechanism (air balancer) 96: Dust collection hopper

Claims (10)

[Claims] 1. An aeration hopper having means for performing aeration on a charged powdery abrasive material, and a bottomed cylindrical type connected to the hopper to receive the abrasive material falling from the hopper. A blast gun comprising: a main body, a polishing material injection nozzle disposed on a side wall of the main body and directed outward from the inside of the main body, and a primary air injection nozzle disposed opposite to the polishing material injection nozzle. . 2. A blast gun according to claim 1, wherein said spray nozzle has a divergent spray nozzle. 3. A substantially closed vertical blasting chamber having an access window, support means for positioning an elongated workpiece in the blasting chamber in a vertical position, a carriage equipped with a blast gun, and the blasting machine. Drive means for driving the carriage so that the gun moves up and down along the surface of the workpiece. 4. A blast processing apparatus according to claim 3, wherein said blast gun is a blast gun provided with an aeration type hopper according to claim 1. 5. The supporting means is capable of supporting a plurality of workpieces juxtaposed, a plurality of blast guns corresponding to the plurality of workpieces are mounted on the carriage,
5. A blasting apparatus according to claim 3, wherein a plurality of workpieces can be blasted at the same time. 6. A hoist mechanism for suspending a workpiece to facilitate loading and unloading of the workpiece into and out of the blasting chamber. Based blasting equipment. 7. A blasting apparatus according to claim 3, wherein the support means rotatably supports the workpiece to blast the workpiece having a cylindrical surface. 8. A dust collecting hopper is provided at the bottom of the blasting chamber to collect the abrasive material dropped thereon, and the blasting device sends the abrasive material collected by the dust collecting hopper to a blast gun. 8. A blasting machine according to claim 3, further comprising a pneumatic transport means for pneumatic transport. 9. The apparatus according to claim 1, further comprising a blower for sucking air in the blast processing chamber, and a dust collecting device for catching dust floating in the air sucked by the blower. 8 blasting device. 10. The dust collecting hopper provided at the bottom of the blasting chamber includes aeration means, and the aeration means of the dust collecting hopper is operated by using exhaust air of the blower. Based blasting equipment.