Multi-blast device

Abstract

To provide a multi-blast device which allows a plurality of workers to simultaneously perform blast processing of a corrosion portion and recover a used abrasive that is shot to the corrosion portion in blast processing to reuse it.SOLUTION: There is provided a multi-blast device comprising: an abrasive storage tank; an air compressor; an air dryer; a vacuum pump and a recovery tank that stores an abrasive obtained by removing dust from a used abrasive. The abrasive storage tank includes a first abrasive storage tank and a second abrasive storage tank. The recovery tank supplies the abrasive stored by removing the dust from the used abrasive recovered by a suction hose to each of the two abrasive storage tanks to make it reusable. The multi-blast device allows a plurality of workers to simultaneously perform blast processing with four blast hoses communication-connected to each of two abrasive supply ports in the lower parts of the two abrasive storage tanks.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a multi-blasting device, and more particularly to a multi-blasting device that allows multiple workers to simultaneously perform surface preparation treatment (blasting treatment) on corroded areas during periodic repair work on corrosion-resistant coatings on structures such as bridges. [Background technology]

[0002] Conventionally, the steel (I-shaped, H-shaped, and box-shaped steel) and concrete that make up structures such as bridges for roads and railways have been coated with corrosion-resistant coatings to prevent corrosion and rust, either by painting with various resin paints (epoxy resin, fluororesin, etc.) or by metal spraying, which forms a coating of metal (zinc, aluminum, magnesium, and their alloys, etc.).

[0003] However, corrosion-resistant coatings on the surface of structures deteriorate over time, causing corrosion and rust, which reduces their functionality, making periodic repairs necessary. Repair work for corrosion-resistant coatings on such structures typically involves surface preparation (hereinafter referred to as blasting), in which abrasives are sprayed at the surface of the structure with compressed air at high speed to clean the deteriorated coating (removing rust and deteriorated coating), followed by repainting or re-metal spraying.

[0004] During blasting, a large amount of dust is scattered, including the abrasives sprayed at high speed onto the corroded areas on the surface of the structure and the rust and corrosion-resistant coatings removed by the abrasives. This dust (paint and metal) may contain harmful substances (e.g., lead), so consideration must be given to the safety of workers and the preservation of the surrounding environment. In recent years, in order to conserve resources, the abrasives used in blasting are collected together with the dust from the rust and the peeled corrosion-resistant coatings, and the dust adhering to the abrasives is separated and collected. The collected abrasives are then reused (recycled).

[0005] For this reason, a system for cleaning the surface of a structure has been disclosed in which an abrasive cleaning nozzle and a suction hose are integrated into a nozzle head at the tip of a blast hose, and the abrasive cleaning material is sprayed from the spray nozzle to clean the surface of the structure, while the sprayed abrasive cleaning material and dust detached from the surface of the structure are collected by the suction hose, and the abrasive cleaning material is separated from the dust, etc., and the collected abrasive cleaning material can then be reused (recycled) (see Patent Document 1). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent Publication No. 11-207624 Summary of the Invention [Problem to be solved by the invention]

[0007] According to the structure surface abrasive cleaning system described in Patent Document 1, the worker performing the repair work holds the nozzle head at the end of the blast hose and blasts the corroded areas on the surface of the structure, and then collects the abrasives and dust after the blasting process. This prevents rust from forming in the corroded areas removed by the blasting process and prevents the scattering of dust, and allows the collected abrasives to be reused.

[0008] However, when blasting is performed in repair work over a wide area of ​​a structure, blasting of localized corroded areas as in Patent Document 1 takes a significant amount of work time and does not allow for the creation of an efficient abrasive cleaning system for the surface of the structure. Also, corroded areas such as rust that has occurred in narrow areas and corners of a structure or on screws in steel fastening parts cannot be effectively removed with a nozzle head as in Patent Document 1, so open blasting, in which abrasive material is fired at high speed from the tip of a blast hose toward the corroded area, is preferable.

[0009] In order to solve the above problems, the present invention aims to provide a multi-blasting device that allows multiple workers to blast corroded areas simultaneously when blasting a wide area of ​​anti-corrosion coating on a structure, and that can collect and reuse used abrasives that are fired at the corroded areas during blasting. [Means for solving the problem]

[0010] In order to achieve the above object, the present invention provides the following techniques.

[0011] The present invention provides a multi-blasting device comprising an abrasive storage tank having an abrasive supply port that communicates with a blast hose that sprays abrasive and supplies the stored abrasive, an air compressor that supplies compressed air to the blast hose, an air dryer that dries the compressed air that is supplied to the blast hose, a vacuum pump that sucks used abrasive together with dust into a suction hose, and a recovery tank that stores the used abrasive from which dust has been removed that has been sucked by the vacuum pump, wherein the abrasive storage tank: arranged side by side The abrasive storage tank is made up of two abrasive storage tanks, a first abrasive storage tank and a second abrasive storage tank, and the recovery tank is middle Located at the top At the same time , the used abrasive collected by the suction hose a supply port for supplying the used abrasive to the recovery tank, a collision plate provided in the recovery tank at a position facing the supply port, and a discharge port opening on the opposite side of the collision plate from the supply port and discharging dust separated from the used abrasive, The abrasive material from which dust has been removed and stored is supplied to the first abrasive material storage tank and the second abrasive material storage tank, respectively, so that it can be reused. The first abrasive material storage tank and the second abrasive material storage tank each have two abrasive material supply ports at their lower parts, each of which is connected in communication with a blast hose, and the first abrasive material storage tank and the second abrasive material storage tank each have two abrasive material supply ports connected in communication with a blast hose. total The four blast hoses enable multiple workers to carry out blasting simultaneously, making this a multi-blasting device.

[0012] In addition, the recovery tank The tank has a cylindrical shape with a funnel-shaped narrowing at the bottom, and a pair of downflow hoses are provided at positions facing each other on the inclined surface of the funnel-shaped portion, one of the pair of downflow hoses being connected to the top of the first abrasive storage tank, and the other downflow hose being connected to the top of the second abrasive storage tank. It is characterized by: The collecting tank is also characterized in that a second outlet that can be opened and closed is provided at the bottom end of the funnel-shaped portion of the collecting tank for discharging the used abrasive material from within the collecting tank.

[0013] Furthermore, the recovery tank A vibrating screen made of a perforated steel plate having openings of a predetermined size is disposed above the abrasive storage area inside the recovery tank. It is characterized by: [Effects of the Invention]

[0014] The present invention provides a multi-blasting device comprising an abrasive storage tank having an abrasive supply port that is connected to a blast hose that sprays abrasive and supplies the stored abrasive, an air compressor that supplies compressed air to the blast hose, an air dryer that dries the compressed air that is supplied to the blast hose, a vacuum pump that sucks used abrasive together with dust into a suction hose, and a recovery tank that stores the used abrasive from which dust has been removed that has been sucked by the vacuum pump. The abrasive storage tank is made up of two abrasive storage tanks, a first abrasive storage tank and a second abrasive storage tank, and the recovery tank is the first abrasive storage tank. This multi-blasting device is arranged above the first abrasive storage tank and the second abrasive storage tank, and removes dust from used abrasives collected by a suction hose and stores the abrasives, which are then supplied to the first abrasive storage tank and the second abrasive storage tank, respectively, so that they can be reused.The lower parts of the first abrasive storage tank and the second abrasive storage tank have two abrasive supply ports that are connected to blast hoses, and the four blast hoses that are connected to the abrasive supply ports at the lower parts of the first abrasive storage tank and the second abrasive storage tank, respectively, allow multiple workers to perform blasting simultaneously.

[0015] In this way, multiple workers can simultaneously blast corroded areas of major parts of bridges and other structures over a wide area, improving the efficiency of repair work and shortening the construction period. Furthermore, by drying the compressed air supplied to the blast hose with an air dryer and performing blasting with low-humidity compressed air, the occurrence of rust recurrence during blasting can be reduced. Furthermore, supplying dry compressed air to the blast hose can prevent clogging of the blast hose with abrasives.

[0016] The abrasive material injected at high speed onto the corroded area is then removed by a vacuum pump and sucked into the suction hose via the vacuum pump. The abrasive material is mixed with dust particles, consisting of rust and degraded anticorrosion coating fragments (hereinafter referred to as coating fragments), that have formed on the corroded area. The abrasive material is then separated into abrasive and dust particles at the top of the tank, after which the separated abrasive material is stored in the tank. The bottom of the tank is connected to the tops of the first and second abrasive storage tanks via a downflow hose. The worker can then open a downflow valve on the downflow hose to allow the abrasive material stored in the tank to flow down into the first or second abrasive storage tank below. That is, the used abrasive of the present invention can be reused after coating chips, dust, etc. have been removed. Furthermore, a vibrating screen is provided inside the recovery tank made of a perforated steel plate, which sifts the abrasives to remove large debris and recover abrasives of a specified size. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a perspective view illustrating a configuration of a multi-blast device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a plan view illustrating the flow of air and abrasives in the multi-blasting device according to the present embodiment. [Figure 3] FIG. 2 is a perspective view illustrating the configuration of two abrasive storage tanks and a recovery tank of the multi-blasting device according to the present embodiment. [Figure 4] FIG. 2 is a perspective view illustrating the configuration of two abrasive storage tanks and a recovery tank of the multi-blasting device according to the present embodiment. [Figure 5] FIG. 2 is a perspective view illustrating the configuration of a dust separation device of the multi-blasting device according to the present embodiment. [Figure 6] FIG. 2 is a perspective view illustrating the configuration of a dust separation device of the multi-blasting device according to the present embodiment. [Figure 7] FIG. 2 is a side view illustrating the collection of used abrasive and dust from the multi-blasting device according to the present embodiment. [Figure 8] FIG. 10 is a side view illustrating filter replacement of the dust collector of the multi-blasting device according to the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0020] The present invention provides a multi-blasting device comprising an abrasive storage tank having an abrasive supply port that communicates with a blast hose that sprays abrasive and supplies the stored abrasive, an air compressor that supplies compressed air to the blast hose, an air dryer that dries the compressed air that is supplied to the blast hose, a vacuum pump that sucks used abrasive together with dust into a suction hose, and a recovery tank that stores the used abrasive from which dust has been removed that has been sucked by the vacuum pump. The abrasive storage tank is made up of two abrasive storage tanks, a first abrasive storage tank and a second abrasive storage tank, and the recovery ... This multi-blasting device is arranged above the first abrasive storage tank and the second abrasive storage tank, and collects used abrasive with a suction hose to remove dust and store the abrasive, which is then supplied to the first abrasive storage tank and the second abrasive storage tank, respectively, for reuse.The lower parts of the first abrasive storage tank and the second abrasive storage tank each have two abrasive supply ports that are connected to blast hoses, and the four blast hoses that are connected to the abrasive supply ports at the lower parts of the first abrasive storage tank and the second abrasive storage tank, respectively, allow multiple workers to perform blasting simultaneously.

[0021] An example of a multi-blasting device according to the present invention will be described below with reference to FIGS. 1 to 8. FIG. 1 is a perspective view illustrating the configuration of the multi-blasting device according to this embodiment. FIG. 2 is a plan view illustrating the flow of air and abrasives in the multi-blasting device according to this embodiment. FIG. 3 is a perspective view illustrating the configuration of two abrasive storage tanks and a recovery tank in the multi-blasting device according to this embodiment. FIG. 4 is a perspective view illustrating the configuration of two abrasive storage tanks and a recovery tank in the multi-blasting device according to this embodiment. FIG. 5 is a perspective view illustrating the configuration of a dust separation device in the multi-blasting device according to this embodiment. FIG. 6 is a perspective view illustrating the configuration of a dust separation device in the multi-blasting device according to this embodiment. FIG. 7 is a side view illustrating the collection of used abrasives and dust in the multi-blasting device according to this embodiment. FIG. 8 is a side view illustrating filter replacement for the dust collector in the multi-blasting device according to this embodiment.

[0022] The blasting treatment in the present embodiment described below is a surface preparation treatment in which an abrasive is sprayed at high speed with compressed air onto the anticorrosion coating that has deteriorated over time on the surface of a structure (removing rust and deteriorated coating) in repair work of the anticorrosion coating on a structure such as a bridge girder. The abrasive used in this blasting treatment is well-known alumina sand, steel grid, garnet, ferronickel slag, etc., and an abrasive with an optimal grain size (size) is used depending on the type of anticorrosion coating.

[0023] 1 and 2, an overview of the configuration of the multi-blasting device 1 of this embodiment and the flows of the abrasives and compressed air used and the recovered used abrasives will be described below. As shown in FIGS. 1 and 2, the multi-blasting device 1 of this embodiment has a rectangular housing K1 made of steel plate, and two tanks, a first abrasive storage tank 10A and a second abrasive storage tank 10B, arranged in parallel. A recovery tank 20 is arranged above and midway between the first abrasive storage tank 10A and the second abrasive storage tank 10B. Four blast hoses BH are connected to each of two abrasive supply ports 11A and 11B at the bottom of the first abrasive storage tank 10A and the second abrasive storage tank 10B.

[0024] The ends of two air supply hoses EH are connected to the air tanks 12 of the first abrasive storage tank 10A and the second abrasive storage tank 10B, and the starting ends of the two air supply hoses EH are connected to an air compressor 60. When the air compressor 60 is operated, compressed air is supplied to the air tanks 12 via the air supply hoses EH. Air dryers 40, 40 are provided midway along the two air supply hoses EH connected to the air compressor 60 and the air tanks 12 of the first abrasive storage tank 10A and the second abrasive storage tank 10B, respectively, so that the compressed air supplied to the air tanks 12 of the first abrasive storage tank 10A and the second abrasive storage tank 10B via the two air supply hoses EH is dried to reduce humidity as much as possible.

[0025] In this embodiment, the multi-blasting device 1 dehumidifies (i.e., dries) the compressed air generated by the air compressor 60 as it flows through the air supply hoses EH using the air dryers 40 and supplies it to the air tanks 12 of the first abrasive storage tank 10A and the second abrasive storage tank 10B. The base ends (proximal ends) of two blast hoses BH are connected to the air tanks 12, respectively, to supply high-pressure compressed air to a total of four blast hoses BH. A predetermined amount of abrasive is mixed with the compressed air of the four blast hoses BH at the abrasive supply ports 11A and 11B at the bottom of the first abrasive storage tank 10A and the second abrasive storage tank 10B. Abrasive is sprayed onto the corroded anticorrosion coating from spray nozzles (not shown) attached to the ends (hereinafter referred to as the tips) of the four blast hoses BH, allowing blasting treatment to be performed. That is, the multi-blast device 1 of this embodiment allows up to four workers to perform blasting (blasting work) at the same time.

[0026] The starting end of the suction hose KH is connected to a vacuum pump 50, and the end of the suction hose KH is open so as to suck up used abrasives containing dust at the construction site where blasting work is performed. A recovery tank 20 and a dust separator 30 are installed between the starting end and the end of the suction hose KH.

[0027] Used abrasive containing dust sucked from the opening at the end of the suction hose KH (hereinafter simply referred to as the tip of the suction hose KH) is supplied into the recovery tank 20 from a supply port KHa at the top of the recovery tank 20. Alternatively, as shown in Fig. 2, the suction hose KH may be branched via a branch pipe SP midway between the tip of the suction hose KH and the supply port KHa at the top of the recovery tank 20, so that the used abrasive containing dust can be sucked into multiple suction hoses KH (two in the figure). The used abrasive supplied into the recovery tank 20 is separated from the dust and the like, and only the abrasive is stored in the lower part of the recovery tank 20, and is then supplied to a first abrasive storage tank 10A and a second abrasive storage tank 10B installed below the recovery tank 20 for reuse.

[0028] Dust and other particles separated from the used abrasive are discharged by the negative pressure of the vacuum pump 50 from an outlet KHb on the opposite side of the supply port KHa at the top of the recovery tank 20 into a suction hose KH outside the recovery tank 20. The dust is then supplied to the dust separator 30 located between the recovery tank 20 and the vacuum pump 50. The dust separator 30 is composed of a centrifuge 31 and a dust collector 32, and first, larger dust particles such as paint chips are separated and collected from the dust supplied by the centrifuge 31. Next, fine dust particles are filtered and collected by a cylindrical filter cloth inside the dust collector 32. Finally, only clean air is supplied to the vacuum pump.

[0029] With the multi-blasting device 1 configured as described above, it is possible to collect and reuse used abrasives fired at corroded areas during blasting, and also to safely collect and discard dust containing paint film fragments that may have adverse effects on workers using the dust separator 30. The multi-blasting device 1 of this embodiment is equipped with a generator 70, which supplies the power necessary to operate the various devices that make up the multi-blasting device 1, such as the air dryer 40, vacuum pump 50, and air compressor 60.

[0030] 3 and 4, the configuration of the two abrasive storage tanks 10A and 10B that make up the multi-blasting device 1, and the recovery tank 20 disposed above and midway between the first abrasive storage tank 10A and the second abrasive storage tank 10B, will be described in detail. In this embodiment, as described above, the first abrasive storage tank 10A and the second abrasive storage tank 10B are disposed in parallel inside the rectangular housing K1 made of steel plate. The recovery tank 20 is disposed above and midway between the first abrasive storage tank 10A and the second abrasive storage tank 10B.

[0031] The first abrasive storage tank 10A and the second abrasive storage tank 10B are composed of a cylindrical body plate with a funnel-shaped bottom and a sliding top plate 13 that can be opened and closed. Iron or steel plate is preferably used for the body plate and top plate 13. The abrasive to be supplied to the first abrasive storage tank 10A and the second abrasive storage tank 10B is supplied and stored inside by opening the top plate 13. Furthermore, by closing the top plate 13 while the multi-blasting device 1 is in operation, it is possible to prevent rainwater and debris from entering from the outside.

[0032] Abrasive discharge valves 15 for discharging the abrasives are provided at the bottom ends of the first abrasive storage tank 10A and the second abrasive storage tank 10B, and the abrasives stored in the first abrasive storage tank 10A and the second abrasive storage tank 10B can be discharged to the outside by opening the abrasive discharge valves 15. In other words, the abrasive discharge valves 15 are used when changing the type of abrasive used.

[0033] Abrasive supply ports 11A, 11B are provided on both the left and right sides of the abrasive discharge valve 15. Four blast hoses BH are connected to each of these abrasive supply ports 11A, 11B, and dried compressed air supplied by air supply hoses EH via air dryers 40 from air compressor 60 is mixed with a predetermined amount of abrasive at the connection between the four blast hoses BH, which have air tank 12 as their base ends, and the abrasive supply ports 11A, 11B. In this way, the blasting process is performed by ejecting abrasive at high speed from injection nozzles (not shown) provided at the tips of the four blast hoses BH onto the corroded anticorrosion coating.

[0034] The multi-blasting device 1 of this embodiment is provided with a remote control device (not shown) that can control the spraying of abrasive, stopping the spraying, or spraying only compressed air without abrasive (so-called air blowing), for each of the four blast hoses BH. This remote control device is preferably a wired remote control switch, and is disposed near the tip of the blast hose BH. The remote control switch has multiple buttons (switches) that can select spraying of abrasive, stopping the spraying, or air blowing (spraying only compressed air), and can be operated by the worker performing the blasting process while holding the tip of the blast hose BH. This wired remote control switch is connected to a control panel (not shown) and has a function that can detect broken wiring. If a break is detected, the spraying of abrasive or the spraying of air is automatically stopped, and subsequent operation is suspended until the break is repaired.

[0035] A silencer S serving as a noise suppression device is disposed above the air tanks 12 of the first abrasive storage tank 10A and the second abrasive storage tank 10B. In the multi-blasting device 1 of this embodiment, the air pressure inside the first abrasive storage tank 10A and the second abrasive storage tank 10B is kept higher than the ambient air pressure so that a predetermined amount of abrasive can be smoothly discharged from the abrasive supply ports 11A, 11B into the four blast hoses BH that have the air tank 12 as their base end and mixed with compressed air. For this reason, when work is completed or when replacing the abrasive, it is necessary to discharge air from the first abrasive storage tank 10A and the second abrasive storage tank 10B to return the air to normal air pressure, and discharging the air through this silencer S reduces the sound of the air being discharged (i.e., noise).

[0036] The recovery tank 20 is disposed above and midway between the first abrasive storage tank 10A and the second abrasive storage tank 10B. Similar to the first abrasive storage tank 10A and the second abrasive storage tank 10B, the recovery tank 20 has a cylindrical shape with a funnel-shaped narrowing at the bottom. A supply port KHa for used abrasive containing dust is provided at the top of the recovery tank 20, and used abrasive containing dust is sucked in through the opening at the tip of the suction hose KH and supplied to the recovery tank 20 from the supply port KHa.

[0037] Used abrasives supplied into the recovery tank 20 from the supply port KHa collide at high speed with the collision plate 24 (see FIG. 7) installed opposite the supply port KHa due to the suction force of the vacuum pump 50. This causes dust adhering to the abrasives to be separated from the abrasives. A wear-resistant steel plate is preferably used as the collision plate 24, as it can withstand collisions with the abrasives. However, if the abrasives used are soft, non-metallic materials with small grain sizes, such as those used in finish blasting, they are likely to be damaged by collision with the collision plate 24. Therefore, a material other than a wear-resistant steel plate, such as a cedar board, is preferably used. For this reason, the collision plate 24 installed opposite the supply port KHa is detachable for easy replacement. The abrasives that are separated from the dust generated by collision with the collision plate 24 fall downward and are stored inside the recovery tank 20.

[0038] A vibrating screen (not shown) made of a perforated steel plate with numerous holes for sieving the abrasive is disposed above the abrasive storage area of ​​the recovery tank 20. This vibrating screen sifts the falling abrasive and collects only abrasives of a predetermined size. The vibrating screen begins to vibrate when the vacuum pump 50 is activated to collect the used abrasive. By sieving and collecting the used abrasive in this way, even if large debris such as concrete chips or rubbish is mixed in with the used abrasive containing dust supplied into the recovery tank 20 from the supply port KHa, the large debris will remain on top of the vibrating screen. For this reason, a large debris collection door (not shown) is disposed on the side of the recovery tank 20. By opening the debris collection door, the large debris accumulated on top of the vibrating screen can be collected and disposed of.

[0039] The abrasive material containing dust is sucked in from the tip of the suction hose KH and supplied into the recovery tank 20 from the supply port KHa at the top of the tank. The dust separated from the abrasive material upon collision with the collision plate 24 (see FIG. 7) and the dust sucked in from the tip of the suction hose KH are discharged from the discharge port KHb on the opposite side of the supply port KHa at the top of the tank 20 to the suction hose KH outside the tank 20 by the negative pressure (suction force) of the vacuum pump 50. The dust is then collected by the dust separator 30 located between the vacuum pump 50 and the tank 20.

[0040] The recovery tank 20 has two vertically elongated rectangular storage amount confirmation windows 22 on its side so that an operator can visually check the amount of collected abrasive stored therein. A transparent acrylic plate is preferably used for the storage amount confirmation windows 22. A rectangular light window 23 is provided on the top surface of the recovery tank 20 so that an operator can visually check the amount of abrasive stored in the recovery tank 20. A transparent acrylic plate is preferably used for the light window 23. The shape of the light window 23 does not have to be rectangular, and it may have any size and shape that allows an operator to visually check the amount of abrasive stored in the recovery tank 20 through the storage amount confirmation window 22 by light entering the recovery tank 20 from the light window 23.

[0041] The worker operates the vacuum pump 50 to collect the used abrasive and dust in response to a decrease in the amount of abrasive stored in the recovery tank 20, which is visually confirmed through the storage amount confirmation window 22. The abrasive stored in the lower part of the recovery tank 20 is supplied to the first abrasive storage tank 10A and the second abrasive storage tank 10B installed below the recovery tank 20 and is reused.

[0042] The lower part of the recovery tank 20 is connected to the approximate center of the top plate 13 on the upper surface of the first abrasive storage tank 10A and the second abrasive storage tank 10B by flow-down hoses 21A and 21B, respectively, through which the abrasive flows down. A flow-down valve (not shown) is provided midway through each of the flow-down hoses 21A and 21B to open and close the flow-down of the abrasive inside the recovery tank 20, and when an operator opens this flow-down valve as desired, the abrasive stored in the recovery tank 20 flows down and is supplied to the first abrasive storage tank 10A or the second abrasive storage tank 10B below.

[0043] A sensor is provided inside the first abrasive storage tank 10A and the second abrasive storage tank 10B to detect when the abrasive stored therein is full, and when an operator opens this downflow valve and detects that the abrasive that has flowed down from the recovery tank 20 to the first abrasive storage tank 10A or the second abrasive storage tank 10B is full, a red rotating light provided at the top of the full amount indicator 14 rotates and emits light to notify the operator. In other words, when the operator opens the downflow valves provided midway through the downflow hoses 21A, 21B, the operator can know that the abrasive in the first abrasive storage tank 10A or the second abrasive storage tank 10B is full by the light emitted by the rotating light provided at the top of the full amount indicator 14, and then close the downflow valves to stop the supply (replenishment) of abrasive from the recovery tank 20 to the first abrasive storage tank 10A or the second abrasive storage tank 10B.

[0044] A discharge hose 21C that discharges the abrasive material in the recovery tank 20 to the outside is connected to the center of the lower part of the recovery tank 20. A discharge valve (not shown) that opens and closes the discharge of the abrasive material is provided on the discharge hose 21C, and an operator can discharge the abrasive material in the recovery tank 20 to the outside by opening the discharge valve. Discharge of the abrasive material by this discharge valve is performed when changing the type of abrasive material used in the multi-blasting device 1.

[0045] 5 and 6, the configuration of the dust separator 30 constituting the multi-blasting apparatus 1 will be described in detail. In this embodiment, as described above, the dust separator 30 is interposed between the collection tank 20 and the vacuum pump 50. The dust separator 30 is composed of a centrifuge 31 that separates larger coating particles from the collected dust, and a dust collector 32 that collects fine dust. The dust, including the coating particles, separated from the abrasive in the collection tank 20 is discharged into a suction hose KH outside the collection tank 20 by the suction force of the vacuum pump 50 and supplied to the dust separator 30. The dust separator 30 is arranged to house the centrifuge 31 and the dust collector 32 inside a rectangular housing K2 made of steel plate.

[0046] Of the dust discharged into the suction hose KH outside the collection tank 20, larger dust particles such as coating flakes are first centrifuged by the centrifuge 31, and then fall into the collection section 31a at the bottom of the centrifuge 31 for collection. A dust collection door (not shown) is provided in the collection section 31a, and by opening this collection door, the dust inside the collection section 31a is collected to the outside. Fine powder dust other than larger dust particles such as coating flakes is then supplied to the dust collector 32, where it is filtered by multiple cylindrical filter cloths F (see FIG. 8) installed inside the dust collector 32, and is adsorbed onto the cylindrical filter cloths F for collection.

[0047] For this reason, as shown in Figure 8, a replacement door 32a for the cylindrical filter cloth F is provided on the circumferential surface of the cylindrical dust collector 32, and by opening this replacement door 32a, it is easy to replace the multiple cylindrical filter cloths F installed inside the dust collector 32.

[0048] Dust-containing air discharged from the collection tank 20 is supplied to the dust separator 30, where coating fragments are first separated from the supplied dust by a centrifuge 31 and collected. Next, the dust is filtered and collected by a cylindrical filter cloth inside the dust collector 32. Finally, only clean air is discharged by a vacuum pump 50. In this way, by using the cylindrical filter cloth F instead of the expensive molded filters that have conventionally been used as consumables, it is possible to reduce the maintenance costs of the multi-blasting device 1. Furthermore, the dust separator 30 can safely collect and dispose of dust containing coating fragments that may have a negative impact on workers outside the blasting site.

[0049] Hereinafter, the flow of collection of dust-containing abrasives collected by the suction hose KH in this embodiment and the collection of the dust will be described together with reference to Fig. 7. As shown in Fig. 7, the abrasive K containing dust D is sucked from the tip of the suction hose KH and supplied into the recovery tank 20 from the supply port KHa at the top of the recovery tank 20. The abrasive K collides with the collision plate 24, and the dust D that is generated and separated from the abrasives and the dust D that is sucked from the tip of the suction hose KH are discharged from the discharge port KHb on the opposite side of the supply port KHa at the top of the recovery tank 20 to the suction hose KH outside the recovery tank 20 by the negative pressure (suction force) of the vacuum pump 50. Here, the abrasive K that generated dust D is stored in the recovery tank 20 and is supplied to the first abrasive storage tank 10A or the second abrasive storage tank 10B via the downflow hoses 21A and 21B at the bottom of the recovery tank 20 and reused.

[0050] The dust D discharged into the suction hose KH outside the collection tank 20 by the suction of the vacuum pump 50 is first centrifuged by the centrifuge 31 constituting the dust separation device 30 to separate larger dust particles D1 such as coating fragments, which then fall into and are collected in the collection section 31a at the bottom of the centrifuge 31. The powder-like fine dust particles D2 other than the larger dust particles D1 such as coating fragments are then fed to the dust collector 32, where they are filtered by a plurality of cylindrical filter cloths F installed inside the dust collector 32 and are adsorbed onto the cylindrical filter cloths F and collected.

[0051] The multi-blasting device 1 of this embodiment described above allows multiple workers to simultaneously blast corroded areas in the main parts of a wide range of structures, such as bridges, improving the efficiency of structural repair work and shortening the construction period. Furthermore, by drying the compressed air supplied to the blast hose BH by the air compressor 60 with the air dryer 40 and performing blasting with low-humidity compressed air, the occurrence of rust buildup during blasting can be minimized. Furthermore, supplying dry compressed air to the blast hose BH also prevents clogging of the abrasive material in the blast hose BH due to moisture, etc.

[0052] The abrasives supplied into the recovery tank 20 by the suction hose KH are separated into abrasives and dust in the upper part of the recovery tank 20, and the separated abrasives are then stored in the recovery tank 20. The lower part of the recovery tank 20 is connected to the upper parts of the first abrasive storage tank 10A and the second abrasive storage tank 10B by downflow hoses 21A and 21B, through which the abrasives flow downward. When an operator arbitrarily operates and opens downflow valves provided in the downflow hoses 21A and 21B, the abrasives stored in the recovery tank 20 flow downward and are supplied to the first abrasive storage tank 10A or the second abrasive storage tank 10B below. After the used abrasives have been cleaned of coating debris, dust, and the like, they can be reused.

[0053] The dust separator 30, located between the collection tank 20 and the vacuum pump 50, is comprised of a centrifuge 31 that separates coating fragments from the collected dust and a dust collector 32 that collects the separated dust. In other words, the dust, including the coating fragments separated from the abrasive in the collection tank 20, is discharged outside the collection tank 20. The centrifuge 31 collects larger dust particles, such as coating fragments, and the dust collector 32 completely filters and separates the fine dust particles it has sucked in. For this reason, the dust collector 32 filters the fine dust particles using an inexpensive, easily replaceable cylindrical filter cloth. By using a relatively inexpensive cylindrical filter cloth, compared to the expensive molded filters that have conventionally been used as consumables, the maintenance costs of the multi-blasting device 1 can be reduced.

[0054] As described above, with the multi-blasting device 1 of this embodiment, in repair work on widespread corroded areas that have occurred on the surface of a structure such as a bridge, multiple workers can perform open blasting work using multiple blast hoses BH, which improves work efficiency on site and shortens the construction period, resulting in a significant economic effect on repair work.

[0055] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to such specific embodiments, and various modifications and variations are possible within the scope of the gist of the present invention as described in the claims. [Explanation of symbols]

[0056] 1 Multi-blast device 10A First abrasive storage tank 10B Second abrasive storage tank 11A, 11B Abrasive supply port 12 Air Tank 13 Top plate 14 Full capacity indicator 15 Abrasive discharge valve 20 Recovery Tank 21A, 21B Downflow Hose 21C Discharge Hose 22 Storage volume confirmation window 23 Light window 24 Collision plate 30 Dust separator 31 Centrifuge 32 Dust collector 40 Air dryer 50 Vacuum Pump 60 Air Compressor 70 Generator BH Blast Hose EH Air Hose KH suction hose

Claims

1. an abrasive storage tank having an abrasive supply port that communicates with a blast hose that sprays the abrasive and supplies the stored abrasive; an air compressor for supplying compressed air to the blast hose; an air dryer that dries the compressed air supplied to the blast hose; A vacuum pump that sucks up used abrasives together with dust through a suction hose; a recovery tank for storing the used abrasive material from which dust has been removed and which has been sucked by the vacuum pump; In a multi-blast device comprising: The abrasive storage tank comprises: The abrasive storage tank is comprised of two abrasive storage tanks, a first abrasive storage tank and a second abrasive storage tank, which are arranged side by side in the horizontal direction, The recovery tank is a supply port disposed at an upper middle portion of the first abrasive storage tank and the second abrasive storage tank, for supplying the used abrasive collected by the suction hose to the collection tank; an impact plate provided in the recovery tank at a position facing the supply port; a discharge port that opens on the opposite side of the collision plate from the supply port and that discharges dust separated from the used abrasive material, The recovery tank has a cylindrical shape with a funnel-shaped narrowing at the bottom, and a pair of downflow hoses are provided at positions facing each other in the horizontal direction on the inclined surface of the funnel-shaped portion, one of the pair of downflow hoses is connected to the top of the first abrasive storage tank, and the other downflow hose is connected to the top of the second abrasive storage tank, the abrasive material obtained by removing dust from the used abrasive material and storing the abrasive material is supplied to each of the first abrasive material storage tank and the second abrasive material storage tank so that the abrasive material can be reused; the first abrasive storage tank and the second abrasive storage tank each have two abrasive supply ports at their lower portions, each of which is connected in communication with a blast hose; A multi-blasting device characterized in that a total of four blast hoses are connected to the abrasive supply ports at the bottom of the first abrasive storage tank and the second abrasive storage tank, respectively, allowing multiple workers to perform blasting simultaneously.

2. A multi-blasting device as described in Claim 1, characterized in that a second outlet that can be opened and closed is provided at the lower end of the funnel-shaped portion of the recovery tank for discharging the used abrasive material in the recovery tank.

3. The recovery tank comprises:

3. A multi-blasting device according to claim 1, wherein a vibrating screen made of a perforated steel plate having openings of a predetermined size is disposed above the abrasive storage section inside the recovery tank.

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