JP2814228B2 - Abrasive material supply device for blast cleaning - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for supplying an abrasive material for blast cleaning.

[0002]

2. Description of the Related Art Steel plates such as ship outer plates and large oil tanks at petroleum bases are subjected to sandblasting of surface scales and coating materials every few years to check for cracks and other scratches. The metal surface is exposed and inspected using ultrasonic flaw detection, etc., and the damaged part is repaired to prevent the inundation of the ship or the loss of oil stored in the oil tank. doing. In the sand blasting, an abrasive material, which is a steel particle having a diameter of about 1 mm, is transported together with compressed air to an injection portion disposed opposite to a processing surface of a steel sheet, and is sprayed on the processing surface to peel off scale, coating material, and the like.

[0003] In order to reuse the sprayed abrasive material, the abrasive material is sucked and collected together with the dust such as the peeled scale and the coating material by a suction hose connected to the spray portion, and the dust is separated and removed. The material is transferred to and stored in the pressurized storage tank, and the abrasive material in this pressurized storage tank is supplied to the compressed air transfer unit connected to the injection unit, circulated, and the abrasive material is continuously supplied from the injection unit. And spray it. In order to adjust the supply amount of the abrasive material from the pressurized storage tank to the compressed air transfer section, as shown in an explanatory view of FIG. An outlet is continuously provided, and a supply adjusting box is provided so as to embrace the outlet, and a discharge pipe on the lower surface communicates with a compressed air transfer section through which compressed air flows. In addition, a diaphragm valve for opening and closing the discharge port is disposed in close contact with the discharge port in the supply adjustment box, and the discharge port is opened by blowing compressed air from the discharge port side against the diaphragm valve against the elasticity of the diaphragm valve. The valve is opened, the back side of the opened diaphragm valve is received by a stopper, and the position of the stopper is moved forward and backward with respect to the diaphragm valve to flow down from the discharge port to the compressed air transfer section via the discharge pipe. The supply of materials is adjusted.

[0004]

However, in the diaphragm valve provided in the supply adjusting box, even if a stopper is provided on the back side, the blasting material causes the discharge port, which has been opened once, to discharge by its own weight. When the discharge port is narrowed and the discharge port is opened, there is a large difference in the amount of the dropped abrasive material when the discharge port is opened. There is a drawback that it is impossible to accurately adjust the mixing ratio of the polishing material to the inside, and the amount of discharge is wasteful, so that work cannot be performed efficiently. In addition, the blasting material discharged from the discharge port in a natural fall state is operated in a humid condition, and when the discharge port is closed by a diamond frame valve due to primary interruption on the way, the inside of the discharge port Even when the diaphragm valve is opened to restart the work, the discharge material has no driving force for discharging, and the material is clogged in the discharge port. In addition, the discharge port must be hit with a hammer or the like to apply vibrations, and in some cases, the discharge port is damaged and the service life is shortened.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a scale attached to a processing surface to be sand blasted or a pressurized storage portion in accordance with the thickness of a coating material. The discharge amount of the polishing material mixed with the compressed air can be adjusted reliably and at high density, so that the discharge amount of the polishing material is not wasted, the blast work can be performed efficiently, and the polishing material is moist. To provide a blast-cleaning abrasive supply device that does not cause solidification and clogging of the abrasive even when the work is performed, and that blasting can be resumed immediately even after the work is interrupted. is there.

[0006]

In order to achieve the above object, the invention according to claim 1 is directed to an injection unit 14 for spraying an abrasive K with compressed air to a processing surface S, and is connected to the injection unit 14. A collection / separation unit 16 that sucks and collects dust such as scales and coating materials peeled off from the processing surface S and the sprayed abrasive material K; and a collection / separation unit 16 that communicates with the collection / separation unit 16 and collects dust in the collection / separation unit 16. Collection unit 1 that collects dust by sucking air with air
8, a pressurized storage unit 20 for pressurized storage of the grinding material K,
In order to transfer the ground material K collected into the collection / separation unit 16 and separated into dust to the pressurized storage unit 20, it is communicated from the dust collection unit 18 to the pressurized storage unit 20 and at an intermediate position. An air transfer unit 22 to which the collection / separation unit 16 is connected; an exhaust pressure reducing unit 24 to be connected to the pressurized storage unit 20 for generating a suction negative pressure in the air transfer unit 22; In the sandblasting device 12 having a compressed air transfer unit 26 for continuously supplying the abrasive material K fed out from the inside to the injection unit 14 together with compressed air, the pressurized storage unit 2
At the lower end of the discharge port 54, a supply unit 58 for supplying the grinding material K to the compressed air transfer unit 26 is connected, and the supply unit 58 is configured to supply the polishing material K discharged from the discharge port 54. A guide cylinder 60 that is arranged horizontally long in the direction intersecting with the falling direction of the material K.
And a rotating shaft 6 suspended in a longitudinal direction in the guide cylinder 60.
2 and a guide cylinder 60 provided on the outer peripheral surface of the rotary shaft 62.
The blast cleaning abrasive supply device 10 includes a rotary transfer body 64 that guides and advances the abrasive material K dropped into the guide tube 60 in the longitudinal direction of the guide cylinder 60 together with the rotation of the rotation shaft 62.

Further, in the invention according to claim 2, the feed-out supply section 58 may be formed by a screw conveyor.

Further, in the invention according to claim 3, the rotary transfer body 64 may include a spiral groove 76 continuously circulated on the outer peripheral surface of the rotary shaft 62.

Further, in the invention according to claim 4, the end discharge port 78 of the guide cylinder 60 may be provided with an opening / closing valve mechanism 80 for opening and closing the end discharge port 78.

Further, in the invention according to claim 5, the opening / closing valve mechanism 80 includes a valve box 82 communicated from the end outlet 78 of the guide cylinder 60 to the compressed air transfer section 26, and the valve box 8
2, a valve body 8 for opening and closing the end discharge port 78
4 may be included.

Further, in the invention according to claim 6, the guide cylinder 60 is configured such that the end discharge port 78 is located at a position higher than the discharge port 54 of the pressurized storage section 20.
The end discharge port 78 of the guide tube 20 and the compressed air transfer unit 26 may be connected to each other through an airtight transfer path 102 so as to be inclinedly communicated with the discharge port 54 of the zero.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A blast-cleaning abrasive material supply apparatus according to the present invention blows an abrasive material together with compressed air from an injection unit onto a processing surface, and the scale separated from the processing surface by spraying the abrasive material. Then, the dust such as the coating material and the polishing material are sucked and collected from the injection unit, the dust is collected in the dust collecting unit, and the polishing material separated from the dust is stored in the pressurized storage unit. In a sandblasting device that supplies the grinding material to the compressed air transfer unit and continuously circulates it again with the compressed air to the injection unit, the discharge port at the lower end of the pressurized storage unit,
A feeding supply unit for supplying an abrasive material to the compressed air transfer unit is provided in series, and the feeding supply unit is a guide tube that is horizontally long in a direction intersecting with a drop direction of the abrasive material discharged from the discharge port. And a rotating shaft suspended in the longitudinal direction inside the guide tube, and a grinding material provided on the outer peripheral surface of the rotating shaft and falling into the guide tube and guided in the longitudinal direction of the guide tube together with the rotation of the rotating shaft. And a rotating transfer body for moving the moving body. As a result, it is possible to adjust the release amount of the polishing material reliably and precisely according to the condition of the processing surface simply by changing the rotation speed of the rotating shaft supported in the guide cylinder. The blast work can be performed efficiently by discharging without waste. In addition, even if the work is temporarily suspended while the grinding material has absorbed moisture, even if the grinding material rusts in the outlet and the guide cylinder, they can be rusted simply by driving the rotary drive mechanism provided in the guide cylinder. The blasting material is easily disassembled, and the blasting material does not stick in the discharge port or the guide tube to cause clogging, so that the work can be resumed anytime after the work is interrupted.

[0013] The rotary transfer member of the feeding and supply section has a spiral groove continuously orbited on the outer peripheral surface of the rotary shaft. This rotary transfer body is not limited to a spiral groove, and may be constituted by, for example, a spiral blade fixed to an outer peripheral surface of a rotary shaft in a continuous manner, a shaft piece fixed to a spiral with a gap, and the like. May be any as long as it has a structure capable of guiding the grinding material to the end outlet of the guide cylinder by rotation of the rotating shaft. Further, the feeding and supply unit may include a ready-made screw conveyor.

An opening / closing valve mechanism for opening and closing the end discharge port is provided at the end discharge port of the guide cylinder. This opening / closing valve mechanism has a valve box communicated from the end discharge port of the guide cylinder to the compressed air transfer section, and a valve body provided in the valve box to open and close the end discharge port. . This valve element is a presser valve that moves forward and backward toward the end discharge port of the guide cylinder, a butterfly valve whose upper end is pivotally connected to the end discharge port, or a gate valve that slides while closely contacting the end discharge port. Etc. may be provided. During the blasting operation, the on-off valve mechanism can be operated on the feeding and feeding side of the abrasive material to reliably control the discharge and supply stop of the abrasive material. Unnecessary release can be prevented.

Further, the guide cylinder is inclinedly communicated with the discharge port of the pressurized storage section so that the end discharge port is located at a position higher than the discharge port of the pressurized storage section. The discharge port and the compressed air transfer section may be connected to each other through an airtight transfer path. The airtight transfer path is formed in a simple airtight case, and there is no need to provide an open / close valve mechanism at the end discharge port of the guide cylinder. Discharge and stop of the abrasive material to the air transfer unit can be reliably controlled.

[0016]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a system explanatory diagram of a sand blast device provided with a blast cleaning abrasive supply device according to an embodiment of the present invention, and FIG. 2 is a perspective view explanatory diagram of the sand blast device. FIG. 3 shows a partially enlarged vertical explanatory view of the blast cleaning abrasive supply device. As is clear from the figure, the abrasive material supply device for blast cleaning (hereinafter, abbreviated as the abrasive material supply device).
Reference numeral 10 denotes a sandblasting device 12 for exposing a metal surface by exfoliating a scale, a coating material, or the like adhering to a surface or the like of a steel plate P such as an oil tank, and spraying the ground material K onto the treated surface S of the steel plate P. When the collected abrasive materials K are sequentially stored in the pressurized storage unit and mixed with the compressed air again and jetted to the processing surface S, the abrasive materials are transferred into the compressed air transfer path. The feature is that the amount of release can be adjusted reliably and at high density, the amount of release of the polishing material is not wasted, and the blast work is performed efficiently. The grinding material K is an abrasive material such as steel particles and sand for spraying and removing scales, coating materials, and the like attached to the surface of steel materials and castings.

As shown in FIGS. 1 and 2, the sandblasting device 12 is connected to an injection unit 14 for spraying an abrasive material K together with compressed air to a processing surface S of a steel sheet P, and is connected to the injection unit 14. A collection / separation unit 16 that sucks and collects dust such as scales and coating materials separated from the processing surface S and the sprayed abrasive material K, and communicates with the collection / separation unit 16 to remove dust in the collection / separation unit 16. Dust collection unit 18 that sucks and collects dust with air
And a pressurized storage section 20 for pressurized storage of the grinding material K. Further, in order to transfer the ground material K collected and separated into the collection / separation unit 16 to the pressurized storage unit 20, it is communicated from the dust collection unit 18 to the pressurized storage unit 20, and at an intermediate position. Air transfer unit 22 to which collection / separation unit 16 is connected
In order to generate a suction negative pressure in the air transfer unit 22,
An exhaust pressure reducing unit 24 communicated with the pressurized storage unit 20 and a compressed air transfer unit 26 that continuously supplies the abrasive material K fed out from the pressurized storage unit 20 to the injection unit 14 together with compressed air. doing.

The grinding material K is a steel particle having a diameter of about 1 mm, and is discharged, collected and circulated while being stored in the pressurized storage unit 20. The injection unit 14 is formed of an airtight box having an opening in close contact with the processing surface S of the steel plate P, and an injection nozzle 28 for injecting the grinding material K with compressed air is provided at an upper position in the airtight box. A suction port 30 is provided below the spray nozzle 28 for sucking dust such as scales, coating materials, and the like, which are peeled off from the processing surface S by hitting the sprayed abrasive material K, and the abrasive material K. The injection unit 14 performs a blast operation while being suspended in a vertical direction and a horizontal direction along the processing surface S by being suspended on a suspension cable 32 such as a crane truck.

One end of a suction hose 34 is connected to the suction port 30 of the injection unit 14, and the other end of the suction hose 34 communicates with an upper position on the peripheral wall surface of the collection / separation unit 16. The collection and separation unit 20 is formed in a closed tank body,
The discharge valve 36 which opens and closes automatically is connected to the lower end.
The air transfer unit 22 includes an air hose, and a discharge valve 36 at the lower end of the collection / separation unit 16 is connected to the air hose.

The dust collecting section 18 is formed of a normal cyclone, and a communication hose 38 is communicated from the upper wall surface of the collection / separation section 20 to a position tangential to the peripheral wall surface of the cyclone. At the center of the upper surface of this cyclone, an air transfer unit 2
One end is communicated with the other end, and the other end is communicated with an upper position of the peripheral wall surface of the pressurized storage unit 20.

Further, one end of an exhaust hose 38 communicates with an upper position of the peripheral wall surface of the pressurized storage section 20, and the exhaust hose 38 communicates with a suction port of the exhaust pressure reducing section 24 equipped with a vacuum pump. A muffler 40 is connected to a discharge port of the exhaust pressure reducing unit 24. The suction negative pressure from the exhaust pressure reducing unit 24 acts on the injection unit 14 via the pressurized storage unit 20, the dust collection unit 18, the collection / separation unit 16, the suction hose 34, etc. The abrasive material K and the dust that have been jetted are sucked and the abrasive material is primarily stored in the collection / separation unit 16 and then transferred to the pressurized storage unit 20 by the air transfer unit 22.

The compressed air transfer section 26 includes an air compressor 42 such as a compressor, first and second high pressure tanks 44a and 44b connected to the air compressor 42, and one end of the first high pressure tank 44a. A high-pressure hose 46 connected to the injection nozzle 28 of the injection unit 14 at the other end. The pressurized storage unit 20 is formed in a vertical tank having an arbitrary shape, and in the vertical tank, an upper chamber 50a, a middle chamber 50b, and a three-tiered upper and lower funnel-shaped partition plates 48, 48 are provided. A lower chamber 50c is provided. Further, automatic opening / closing valves 52a and 52b are provided in the upper and lower communication holes opened substantially at the center positions of the upper and lower funnel-shaped partition plates 48 and 48, and a discharge port 54 of the polishing material is provided at the lower end of the vertical tank. Is provided. A high pressure hose 56 is connected from the second high pressure tank 44b connected to the air compressor 42 to the middle chamber 50b.
Is communicated.

As a result, when the amount of the polishing material K transferred by the air transfer unit 22 to the upper chamber 50a in the pressurized storage unit 20 where the suction negative pressure of the exhaust pressure reduction unit 24 is acting increases, the upper funnel is increased. The automatic opening / closing valve 52a provided on the state partitioning plate 48 is opened, the grinding material K in the upper chamber 50a is dropped and stored in the middle chamber, and the automatic opening / closing valve 52a is closed. Therefore, when the compressed air is supplied from the second high-pressure tank 44b side to the middle chamber 50b and the internal pressure becomes higher than the pressure of the compressed air flowing through the compressed air transfer unit 26, the lower funnel shape is formed. The automatic opening / closing valve 52b of the partition plate 48 is opened to accommodate the abrasive material in the middle chamber 50b in the lower chamber 50c, and the automatic opening / closing valve 52b is opened.
Is closed and the grounding material in the lower chamber 50c is transferred to the compressed air transfer unit 2.
6 sequentially.

As shown in FIG. 2, the sandblasting device 12
The collection / separation unit 16, the dust collection unit 18, the pressure storage unit 20, the exhaust pressure reduction unit 24, the air compressor 42, the first and second high-pressure tanks 44a and 44b are installed in a machine frame 57, and a suction hose The extension end of the high pressure hose 46 and the extension end of the high pressure hose 46 are detachably connected to the injection unit 14, and can be easily transported to the site while being compactly loaded on a truck or the like.

As shown in FIG. 3, the grinding material supply device 10 comprises:
The sandblasting device 12 is provided with a feed-out supply unit 58 that is connected to the discharge port 54 at the lower end of the pressurized storage unit 20 and supplies the abrasive K to the compressed air transfer unit 26. The feeding / supplying section 58 is provided with a guide cylinder 6 which is disposed horizontally long in a direction intersecting with the falling direction of the polishing material K discharged from the discharge port 54.
0, a rotating shaft 62 extending in the longitudinal direction in the guide tube 60, and a guide tube 6 provided on the outer peripheral surface of the rotating shaft 62.
And a rotary transfer body 64 that guides and advances the grinding material K dropped into the guide tube 60 in the longitudinal direction of the guide cylinder 60 together with the rotation of the rotation shaft 62.

That is, the guide cylinder 60 is formed as a square cylinder, a cylinder, or the like. At a substantially central position on the upper surface side of the guide cylinder 60, a receiving hole 66 communicating with the discharge port 54 at the lower end of the pressurized storage unit 20 is provided.
Is opened. A flange 67 projects in a substantially horizontal direction from an outer peripheral edge of a lower end side of the discharge port 54 of the pressurized storage unit 20, and a guide cylinder 60 is fixed to the flange 67 with a bolt or the like. On the lower surface of the guide tube 60, an inspection slot 68 is opened in the longitudinal direction of the guide tube 60, and the cover 7 is closed.
0 is detachably fixed. Further, the rotating shaft 62
A side bearing 72 having one end supported in a cantilever manner is a guide cylinder 6.
The rotation transfer body 64 fixed to one end of the rotation shaft 0 and fixed to the outer peripheral surface of the rotation shaft 62 is fitted in the guide cylinder 60. Further, a motor 74 with a reduction gear is fixed to the outer surface of the side bearing 72, and the rotation shaft 6 is attached to the reduction shaft of the motor 74 with this reduction gear.
2 are linked and linked.

Thus, the discharge amount of the grinding material K can be assured simply by changing the rotation speed of the rotating shaft in the guide cylinder 60 which communicates with the lower end discharge port 54 of the pressurized storage section 20 through the receiving hole 66. , And can be adjusted with high precision, and the mixing ratio of the abrasive material K to the compressed air supplied to the injection unit 14 can be controlled in accordance with the state of the processing surface S, so that the amount of the abrasive material released is not wasted. Blasting work can be performed efficiently. The guide cylinder 60
Even if the blasting operation is temporarily interrupted in a state where the abrasive material K has absorbed moisture and the abrasive materials rust in the discharge port 54 and the guide cylinder 60, the guide cylinder is 6
The rusting material K which has been rusted can be easily disassembled and discharged by simply driving the rotary drive mechanism in the area 0. Therefore, the blasting work can be promptly resumed even after the work is temporarily interrupted, without the clogging of the grinding materials sticking to each other.
In addition, the guide cylinder 60 can be easily inspected by removing the lid 70 on the lower surface side, and can easily clean the interior by blowing compressed air into the guide cylinder 60 from an air blowing hole (not shown) opened in the side bearing 72. it can.

As shown in the embodiment of FIG.
Is provided with a spiral groove 76 which is continuously formed in a spiral shape on the outer peripheral surface of the rotating shaft 62 and is formed. The grinding material K dropped and accommodated in the spiral groove 76 of the rotating shaft 62 in the guide cylinder 60
Is continuously transported in the spiral groove 76 toward the end discharge port 78 of the guide cylinder 60 by the rotation of the rotating shaft 62 and is discharged, so that the amount of the grinding material K corresponding to the rotation speed of the rotating shaft 62 is supplied. Thus, the sand blasting operation can be effectively performed. The rotary transfer body 64 may be any as long as it can form a spiral groove 76 on the outer peripheral surface of the rotary shaft 62. For example, a spiral blade fixed to the outer peripheral surface of the rotary shaft 62 in a continuous manner, and a spiral gap is formed. And fixed shaft pieces. Further, the guide cylinder 60 may be installed obliquely downward toward the end discharge port 78 to assist the continuous transfer by the rotary transfer body 64.

The feeding / supplying section 58 includes a cylindrical guide tube 6.
It may be constituted by a ready-made screw conveyor provided with a rotary shaft 62 which is rotatably supported in the guide cylinder and the spiral blades are continuously rotated around. Thus, the amount of the abrasive material released from the feeding and supply unit 58 by varying the rotation speed of the rotary shaft of the screw conveyor can be reliably and accurately adjusted according to the state of the work site. Supply can be achieved effectively. In addition, it is possible to reduce the equipment cost of the feeding / supplying unit 58 at low cost by using a commercially available screw conveyor. Further, the feeding and supply unit 58 is not limited to the screw conveyor, and may be provided with a bucket conveyor, an apron conveyor, and the like in the guide tube 60 having a rectangular tube shape.

As shown in FIG. 3, an opening / closing valve mechanism 80 for opening / closing the end discharge port 78 is provided at the end discharge port 78 of the guide cylinder 60. The opening / closing valve mechanism 80 is provided with a valve box 82 communicating from the end discharge port 78 of the guide cylinder 60 to the compressed air transfer unit 26, and a valve provided in the valve box 82 for opening and closing the end discharge port 78. And a body 84.

That is, the valve box 82 has a discharge port 86
Is provided with a suspended cylindrical case 88. One end opening of the cylindrical case 88 is connected to the end outlet 7 of the guide tube 60.
8, a mounting flange 94 to which a fluid cylinder 92 is fixed is fastened to the other end opening of the tubular case 88 by a bolt or the like. Further, a valve body 84 is fixed to an end of the plunger 96 of the fluid cylinder 92 protruding into the cylindrical case 88, and a urethane rubber or the like is provided on a contact surface of the valve body 84 that contacts the end discharge port 78. Is provided.

The T-shaped fitting 100 is connected to the high-pressure hose 46 connected to the first high-pressure tank 44a at a position below the valve box 82, and the T-shaped fitting 100 is connected to the discharge port of the cylindrical case 88. 86 is connected by a joint. Thus, when the blasting operation is performed while moving a plurality of processing surfaces, the opening / closing valve mechanism 80 can be operated on the supply side of the abrasive material K to easily control the discharge and the supply stop of the abrasive material. In addition, the blast work on a plurality of processing surfaces can be performed promptly and efficiently.
When the on-off valve mechanism 80 is closed, the end discharge port 78 of the guide cylinder 60 is closed by the valve body 84, and the suction negative pressure of the compressed air flowing through the compressed air transfer unit 26 in the valve box 82 is reduced. Even if it works, the abrasive material K in the guide cylinder 60 closed by the valve body 84 is not sucked out, and the discharge and stop of the abrasive material during the blasting operation can be reliably controlled, and the necessary parts can be controlled. It is possible to prevent unnecessary discharge of the grinding material in other than the above. Further, the valve element 84 is
It is not limited to a holding valve that moves forward and backward to the end discharge port 78 and opens and closes, but a butterfly valve that is pivotally attached to the upper end of the end discharge port 78 and that opens and closes, or slides while closely contacting the end discharge port. A gate valve or the like that moves and opens and closes may be provided.

Next, the operation of the blast cleaning abrasive supply device 10 according to the embodiment of the present invention will be described. The sand blasting device 12 is carried into the blasting operation site, and the suction hose 34 connected to the collection / separation unit 16 and the high pressure hose 46 of the compressed air transfer unit 26 are connected to the suction port 30 and the injection nozzle 28 of the injection unit 14. , This injection part 14
Is brought into contact with the processing surface S of the steel plate P, and in this state, a start switch provided on a control panel (not shown) provided on the sandblasting device 12 is closed to close the exhaust pressure reducing unit 24, the air compressor 42, and the polishing material. It drives the motor 74 with a speed reducer of the supply device 10 and the like.

At the same time, in the polishing material supply device 10, the fluid cylinder 92 of the valve opening / closing mechanism 80 is operated, and the valve body 84 is retracted from the end discharge port 78 of the guide cylinder 60 together with the plunger 96, so that the end discharge port 78 Is held open. The pressurized storage unit 2 is provided in a gap between the rotary transfer bodies 64 such as a spiral groove 76 provided on the outer peripheral surface of the rotary shaft 62 interlocked with the motor 74 with a speed reducer.
The grinding material K that falls through the discharge port 54 at the lower end of the cylinder 0 and the receiving hole 66 of the guide cylinder 60 is guided and advanced toward the end discharge port 78 of the guide cylinder 60 by the rotation of the rotating shaft 62, and the end discharge port 78.
Then, it flows into the T-shaped fitting 100 on the compressed air transfer unit 26 side through the valve box 82 and the discharge port 86 on the lower surface of the valve box 82. Therefore, the abrasive K is mixed into the compressed air flowing at high speed through the compressed air transfer unit 26 toward the injection nozzle 28 of the injection unit 14 and is injected from the injection nozzle 28 to the processing surface S to be processed. Peel off the scale and coating material adhering to the surface.

Dust such as the abrasive K, the peeled scale and the coating material, etc., injected into the injection unit 14 is sucked into the collection / separation unit 16 via the suction hose 34, and the dust is further collected by the dust collection unit 18. Dust collection process. The polishing material separated and accommodated in the collection / separation unit 16 is air flowing at high speed through the air transfer unit 22 that is connected to the pressurized storage unit 20 from the dust collection unit 18 by opening and closing the discharge valve 36 at the lower end. The liquid is sequentially stored in the pressurized storage unit 20 by the flow, and circulates from the discharge port 54 at the lower end to the feeding supply unit 58.

Accordingly, the discharge port 5 at the lower end of the pressurized storage section 20
When the rotation of the rotary shaft 62 supported in the guide cylinder 60 which is connected in a crossing manner with the rotary shaft 4 is rotated at a high speed, the mixing ratio with respect to the compressed air flowing through the compressed air transfer unit 26 is increased. When the rotation of the rotating shaft 62 is rotated at a low speed, the mixing ratio decreases, and the rotating speed of the rotating shaft 62 is reduced by the motor 74 with a speed reducer.
By simply shifting the speed, it is possible to reliably and precisely adjust the discharge amount of the polishing material. Then, the mixing ratio of the abrasive material injected from the injection unit 14 to the compressed air is controlled according to the state of the scale attached to the processing surface, the thickness of the coating material, and the like, so that the amount of the abrasive material released is wasted. And the blast work on the processing surface can be performed efficiently.

Further, the blasting operation is performed in a state where the abrasive material has absorbed moisture in the weather or on site, and then the operation is temporarily interrupted, and the discharge port 54 of the pressurized storage unit 20 and the feeding / supplying unit 58 are stopped. Even if the grinding materials K rust each other in the guide cylinder 60,
The rusting material K, which has been rusted simply by driving the rotating shaft 62 in the guide cylinder 60 by a drive mechanism such as a motor with a reduction gear, is easily disassembled, and the rubbing materials adhere to each other in the discharge port 54 and the guide cylinder 60. The blasting operation can be promptly resumed only by driving a rotary drive mechanism such as a rotating shaft in the guide cylinder 60 even after the operation has been temporarily interrupted without clogging.

Next, FIG. 4 shows an abrasive material supply device 10a for blast cleaning according to another embodiment. The guide cylinder 60 of the grinding material supply device 10a is configured such that the discharge port 5 of the pressurized storage unit 20 is positioned such that the end discharge port 78 is positioned higher than the discharge port 54 at the lower end of the pressurized storage unit 20.
4 and the end outlet 7 of the guide tube 60.
8 and the compressed air transfer section 26 are characterized by being mutually connected by an airtight transfer path 102. In this embodiment, the same members as those in the previous embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

The guide cylinder 60, which is arranged obliquely with respect to the discharge port 54, has a flange-type pipe joint 104 projecting vertically in the upper surface position near the diagonal lower end. A joint 104 is connected to the outlet 54. On the lower surface of the guide tube 60, an inspection long hole 68 is formed along the longitudinal direction of the guide tube, and a lid 70 is fixed detachably. Further, similarly to the previous embodiment, the rotating shaft 6
A side bearing 72 having one end supported in a cantilever manner is fixed to the oblique lower end of the guide cylinder 60. On the outer peripheral surface of the rotating shaft 62, the grinding material K dropped into the guide cylinder 60 is rotated.
With the rotation of the shaft, the end outlet 78 on the oblique upper end side of the guide cylinder 60
A rotary transfer member 64 for guiding and moving the guide tube 6 is provided.
0. Further, a motor 74 with a speed reducer is fixed to the outer surface of the side bearing 72.
The rotation shaft 62 is connected to and linked to the reduction shaft 4.

The airtight transfer path 102 has one side communicating and fixed to an end discharge port 78 on the oblique upper end side of the guide cylinder 60.
An airtight case 108 having a discharge port 106 is provided on the lower surface. Then, the T-shaped fitting 1 communicated with the high-pressure hose 46 of the compressed air transfer section 26 of the sandblasting device 12.
00, the discharge port 106 of the airtight case 108 is connected with a joint. In addition, the rotary transfer body 64 of the rotary shaft 62 has a spiral groove formed in a continuous spiral around the outer peripheral surface of the rotary shaft 62. The rotary transfer body 64 is not necessarily limited to a spiral groove. For example, a spiral blade continuously fixed to the outer peripheral surface of the rotary shaft 62, a shaft fixed with a gap in a spiral shape to form a spiral groove. You may comprise with a piece etc.

The grinding material supply device 10a according to the present embodiment comprises:
By rotating the rotary shaft 62 in conjunction with the motor 74 with a speed reducer in the guide tube 60 having the above-described configuration, the grinding material K that has fallen into the guide tube 60 from the discharge port 54 of the pressurized storage unit 20 is transferred to the guide tube 60. The air is continuously guided obliquely upward in the inside, and flows from the end discharge port 78 into the T-shaped pipe joint 100 on the compressed air transfer section 26 side via the airtight case 108 and the discharge port 106. Therefore, the abrasive K is mixed into the compressed air flowing at high speed through the compressed air transfer unit 26 toward the injection unit and is injected onto the treated surface of the steel plate. Only by changing the speed by the motor 74 with the reduction gear, the amount of the abrasive material to be discharged can be reliably and precisely adjusted.

When the rotation of the rotary shaft 62 is stopped, the grinding material K stagnates from the position of the flanged pipe joint 104 of the inclined guide cylinder 60 to the end discharge port 78, and the compressed air transfer section 26 Even if the suction negative pressure of the compressed air flowing through the inside at high speed or the load pressure of the grinding material in the discharge port 54 is applied to the grinding material K in the guide cylinder 60, the grinding material is discharged into the airtight case 108. Never be. Therefore, in the grinding material supply device 10 a according to the present embodiment, it is not necessary to provide an opening / closing valve mechanism or the like at the end discharge port 78 of the guide cylinder 60, and the guide cylinder 60 is connected to the discharge port 54 of the pressurized storage unit 20. With a simple structure in which communication is performed in an inclined manner, it is possible to reliably control the discharge and stop of the grinding material K from the pressurized storage unit 20 to the compressed air transfer unit 26. In addition, since the feeding and supply unit 58 for the grinding material has a simple structure, the equipment cost of the apparatus can be reduced at a low cost. The above-mentioned polishing material supply devices 10 and 10a may be installed at the communication port between the portable pressurized storage part of the simple type blast device and the compressed air transfer path.

[0043]

As described above, according to the first aspect of the present invention, there is provided an abrasive material supply apparatus for blast cleaning, which sprays an abrasive material together with compressed air onto a processing surface, and communicates with the injection unit to form the processing surface. A collection / separation unit that sucks and collects dust such as scales, coating materials, and the like that have been peeled off from the surface, and a collection / separation unit that communicates with the collection / separation unit, and sucks dust in the collection / separation unit together with air to collect the dust. A dust collection unit, a pressurized storage unit for pressurized storage of the grounding material, and the dust collection unit for transferring the grounded material collected in the collection and separation unit to separate the dust to the pressurized storage unit. An air transfer unit communicating with the pressure storage unit from the unit and a recovery separation unit communicating with the intermediate position, and an exhaust pressure reduction unit connected to the pressure storage unit to generate a suction negative pressure in the air transfer unit Part, and compresses the grinding material fed out from inside the pressurized storage part. A compressed air transfer unit that continuously supplies the compressed air to the injection unit, and a discharge supply unit that supplies a grinding material to the compressed air transfer unit at a discharge port at a lower end of the pressurized storage unit. Are connected to each other, and the feeding supply unit includes a guide tube that is horizontally long in a direction intersecting with a falling direction of the abrasive material discharged from the discharge port, and a rotation shaft that is axially suspended in the guide tube. A shaft, and a rotary transfer member provided on the outer peripheral surface of the rotary shaft and guiding the advancing material dropped into the guide tube in the longitudinal direction of the guide tube together with the rotation of the rotary shaft. By simply changing the rotation speed of the rotating shaft that is pivotally supported in the guide cylinder that is connected in a crossing manner to the discharge port at the lower end of the storage section, the discharge amount of the grinding material can be reliably and precisely adjusted, The mixing ratio of the grinding material to the compressed air supplied to the injection unit is processed. No waste in release of KenSozai deposited controlled in response to conditions such as the thickness of the scale or coating material, it can be efficiently the blasting operation of the treated surface. In addition, because it has a rotation drive mechanism that transports the grinding material into a guide cylinder that is connected to the discharge port of the pressurized storage unit,
Even if the work is temporarily interrupted while the material is absorbed and the rusting material rusts at the discharge port and the guide cylinder, the rusting material is rusted just by driving the rotary drive mechanism inside the guide cylinder. Is easily disassembled, and the blasting work can be quickly resumed even after the work is temporarily interrupted, without the rusting material that has rusted in the discharge port and the guide tube being stuck to each other and clogging.

According to a second aspect of the present invention, the feeder comprises a screw conveyor so that the rotational speed of the screw of the screw conveyor can be varied to reduce the amount of the abrasive material discharged from the feeder. In addition, it can be adjusted reliably and with high precision according to the condition of the work site, and the effective supply of the polishing material can be achieved. In addition, it is possible to use a commercially available screw conveyor to reduce the equipment cost of the feeding and feeding unit at low cost.

According to the third aspect of the present invention, the rotary transfer body is provided with a spiral groove continuously circulated on the outer peripheral surface of the rotary shaft, so that the rotary transfer body is provided in the spiral groove of the rotary shaft in the guide cylinder. When the rotating shaft rotates in the guide tube, the dropped and stored grinding material is continuously transported in the spiral groove toward the end discharge port of the guide tube and discharged from the end discharge port, and the rotation of the rotary shaft is performed. The effective supply of sandblasting work can be achieved by stably supplying the amount of grinding material corresponding to the speed.

According to the fourth aspect, the end discharge port of the guide cylinder is provided with an opening / closing valve mechanism for opening and closing the end discharge port, so that the processing surface can be moved at a plurality of locations. When performing blasting work, the on-off valve mechanism can be operated on the supply side of the blasting material to easily control the release and stop of the blasting material, making it possible to quickly and efficiently perform blasting work on multiple processing surfaces. Can be done

According to a fifth aspect of the present invention, the opening / closing valve mechanism is provided with a valve box communicated from a discharge port at an end of the guide tube to a compressed air transfer section, and provided in the valve box, A valve body that opens and closes a discharge port, so that when the on-off valve mechanism is closed, the end discharge port at the end of the guide cylinder is closed by the valve body, and the guide cylinder is communicated with the compressed air transfer unit by the valve box. Even if the negative pressure of the compressed air flowing through the compressed air transfer section acts on the side, the abrasive material in the guide cylinder is not sucked out, and discharge and stop of the abrasive material during blasting work Can be reliably controlled, and wasteful release of the polishing material in places other than the necessary places can be prevented.

Further, according to claim 6, the guide cylinder is
The discharge port of the pressurized storage section is inclinedly communicated with the discharge port of the pressurized storage section so that its end discharge port is positioned higher than the discharge port of the pressurized storage section, and the end discharge port of the guide cylinder and the compressed air transfer section are connected. With the airtight transfer passage, it is not necessary to provide an opening / closing valve mechanism at the end of the guide cylinder, and the guide cylinder is inclined to communicate with the discharge port of the pressurized storage section in a simple manner. With the structure, discharge and stop of the abrasive material from the pressurized storage unit to the compressed air transfer unit can be reliably controlled. In addition, since the feeding and supply section of the grinding material has a simple structure, the equipment cost of the apparatus can be reduced at a low cost.

[Brief description of the drawings]

FIG. 1 is a system explanatory diagram of a sad blast apparatus provided with an abrasive supply device for blast cleaning according to the present invention.

FIG. 2 is an explanatory perspective view of a sandblasting device.

FIG. 3 is a partially enlarged vertical cross-sectional explanatory view of a blast cleaning abrasive supply device according to the present invention.

FIG. 4 is a partially enlarged vertical cross-sectional explanatory view of a blast cleaning abrasive supply device according to another embodiment.

FIG. 5 is an explanatory longitudinal sectional view of a conventional blast cleaning abrasive supply device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 Abrasive material supply device for blast cleaning blasting 12 Sandblasting device 14 Injection unit 16 Recovery / separation unit 18 Dust collection unit 20 Pressurized storage unit 22 Air transfer unit 24 Exhaust pressure reduction unit 26 Compressed air transfer unit 54 Discharge port 58 Feeding unit Reference Signs List 60 Guide cylinder 62 Rotary shaft 64 Rotary transfer body 76 Spiral groove 78 End discharge port 80 Open / close valve mechanism 82 Valve box 84 Valve body 102 Airtight transfer path P Steel plate S Processing surface K Research material

Continuation of the front page (56) References JP-A-1-321168 (JP, A) JP-A-6-114737 (JP, A) JP-A-5-293761 (JP, A) JP-A-8-1518 (JP) JP-A 7-112369 (JP, A) JP-A 60-86465 (JP, U) JP-A 50-39888 (JP, U) JP-A 63-107558 (JP, U) JP-A 63-66137 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B24C 7/00 B24C 9/00

Claims (6)

(57) [Claims] 1. An injection unit for spraying an abrasive material together with compressed air onto a processing surface, and a suction-collecting unit which communicates with the injection unit and which is sprayed with dust such as scale and coating material peeled off from the processing surface. A collection and separation unit that communicates with the collection and separation unit, and a dust collection unit that sucks dust in the collection and separation unit together with air and collects the dust; a pressurized storage unit that pressurizes and stores the polishing material; In order to transfer the ground material collected into the collection / separation unit to separate the dust to the pressure storage unit, the collection unit was connected to the pressure storage unit from the dust collection unit, and the collection / separation unit was connected to an intermediate position. An air transfer unit, an exhaust pressure reduction unit connected to the pressurized storage unit for generating a suction negative pressure in the air transfer unit, and a blasting unit fed with compressed air from the pressurized storage unit together with the compressed air. And a compressed air transfer unit for continuously supplying In the discharge device, a feeding supply unit that supplies an abrasive material to the compressed air transfer unit is connected to a discharge port at a lower end of the pressurized storage unit, and the feeding supply unit is discharged from the discharge port. A guide tube disposed horizontally long in a direction intersecting with the falling direction of the grinding material, a rotating shaft suspended in a longitudinal direction in the guide tube, and provided on an outer peripheral surface of the rotating shaft and dropped into the guide tube. A blast cleaning abrasive supply device, comprising: a rotary transfer member that guides the advanced grinding material in the longitudinal direction of the guide cylinder along with the rotation of the rotating shaft. 2. The apparatus according to claim 1, wherein the feeder comprises a screw conveyor. 3. The rotary transfer body according to claim 1, further comprising a spiral groove continuously circulating around an outer peripheral surface of a rotary shaft.
A blast-cleaning material supply device for blast cleaning as described above. 4. An abrasive material supply for blast cleaning according to claim 1, wherein an open / close valve mechanism for opening and closing the end discharge port is provided at an end discharge port of the guide cylinder. apparatus. 5. The valve opening and closing valve mechanism is provided with a valve box communicated from an end discharge port of the guide cylinder to a compressed air transfer section, and a valve body provided in the valve box to open and close the end discharge port. The blast-cleaning abrasive supply device according to claim 4, comprising: 6. The guide cylinder is inclinedly communicated with a discharge port of the pressurized storage section so that an end discharge port is located at a position higher than a discharge port of the pressurized storage section. The blast-cleaning abrasive supply device according to any one of claims 1 to 3, wherein the end discharge port and the compressed air transfer unit are connected to each other through an airtight transfer path.