Blast device for recovering abrasive

Abstract

To provide a blast device capable of further cleaning sucked air.SOLUTION: A blast device 10 comprises: a recovery tank 20 into which an abrasive P, powder dust P1, fine powder dust P2 finer than the powder dust P1, and fine particles P3 flow together with air A and which recovers the abrasive P; a cyclone unit 40 that collects the powder dust P1 among the powder dust P1, the fine powder dust P2, and the fine particles P3 flowing out from the recovery tank 20; a dust collector 60 that collects the fine powder dust P2 of the fine powder dust P2 and the fine particles P3 flowing out from the cyclone unit 40; and a filter 80 that collects the fine particles P3 flowing out from the dust collector 60. The air A is discharged from the filter 80.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a blasting device that removes coatings such as paint that have deteriorated over time and that cover structures such as bridges, while recovering abrasives used to condition the base material. [Background technology]

[0002] 2. Description of the Related Art The surfaces of steel or concrete that make up roads, bridges, etc. are protected by coating them with anti-corrosion and anti-rust paint.

[0003] However, the coated surface may deteriorate over time and rust may form, so it is necessary to carry out a so-called blasting process to remove the rust and the deteriorated coating while also conditioning the surface of the steel or concrete that makes up the roads, bridges, etc.

[0004] Therefore, in Japanese Patent Application Laid-Open No. 2023-62489 filed by the present applicant as an apparatus used in the blasting treatment, a multi-blasting apparatus is provided which includes an abrasive storage tank having an abrasive supply port which is connected to a blast hose which sprays out the abrasive and supplies the stored abrasive, an air compressor which supplies compressed air to the blast hose, an air dryer which dries the compressed air supplied to the blast hose, a vacuum pump which sucks the used abrasive together with dust into a suction hose, and a recovery tank which stores the abrasive from which dust has been removed from the used abrasive sucked by the vacuum pump, and the abrasive storage tanks are two abrasive storage tanks, namely a first abrasive storage tank and a second abrasive storage tank. The multi-blasting device disclosed is composed of a tank, the recovery tank is arranged above the first abrasive storage tank and the second abrasive storage tank, and the abrasive collected by a suction hose has dust removed from it and stored, and is then supplied to the first abrasive storage tank and the second abrasive storage tank, respectively, so that it can be reused.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.

[0005] The multi-blasting device described above recovers abrasives. It uses a vacuum pump to suck up used abrasives together with dust, and separates the sucked-up abrasives and dust in a recovery tank. It also has a centrifuge to separate larger paint chips from the collected dust, and a dust collector to collect fine dust. The used abrasives from which larger paint chips and fine dust have been collected from the sucked-in air can be reused by removing the paint chips and dust.

[0006] In this way, used abrasives can be reused by removing paint chips, dust, etc., and are therefore economical and popular among users.

[0007] However, although the multi-blasting device removes used abrasives, paint chips, dust, etc. from the sucked air before discharging it, there is a demand from users for the exhaust to be even cleaner. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Publication No. 2023-62489 Summary of the Invention [Problem to be solved by the invention]

[0009] The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a blasting device that can further purify the sucked air. [Means for solving the problem]

[0010] In order to solve the above problems, the blasting device of the first aspect has a recovery tank into which abrasives, dust, and fine dust and particles finer than the dust flow together with air and which recovers the abrasives, a cyclone section which collects the dust from the dust, fine dust, and fine particles which flow out of the recovery tank, a dust collector which collects the fine dust from the fine dust and fine particles which flow out of the cyclone section, and a filter section which collects the fine particles which flow out of the dust collector, and which discharges air from the filter section.

[0011] In order to solve the above-mentioned problems, the blasting device of the second aspect includes a collection tank into which abrasives, dust, and fine dust and fine particles finer than the dust flow together with air and into which the abrasives are collected; The system has a cyclone section that collects the dust from the fine dust, fine dust, and fine particles that flow out of the collection tank, a dust collector that collects the fine dust from the fine dust and fine particles that flow out of the cyclone section, and a filter section that collects the fine particles that flow out from the dust collector, and the filter section has a HEPA filter, and air is discharged through the HEPA filter.

[0012] In order to solve the above problems, the blasting device of the third aspect has a recovery tank into which abrasives, dust, and fine dust and particles finer than the dust flow in together with air, and which recovers the abrasives, a cyclone section which collects the dust from the dust, fine dust, and fine particles that flow out of the recovery tank, a dust collector which collects the fine dust from the fine dust and fine particles that flow out of the cyclone section, a filter section which collects the fine particles that flow out of the dust collector, and a vacuum pump which sucks the abrasives, dust, and fine dust and particles finer than the dust into the air, and discharges the air from the filter section.

[0013] In order to solve the above problems, the blasting device of the fourth aspect has a recovery tank into which abrasives, dust, and fine dust and particles finer than the dust flow in together with air and which recovers the abrasives, a cyclone section which collects the dust from the dust, fine dust, and fine particles which flow out of the recovery tank, a dust collector which collects the fine dust from the fine dust and fine particles which flow out of the cyclone section, a filter section which collects the fine particles which flow out of the dust collector, and a vacuum pump which sucks in the abrasives, dust, fine dust, and fine particles finer than the dust, and air, and the filter section has a HEPA filter, and the air is discharged through the HEPA filter.

[0014] In order to solve the above-mentioned problems, the blasting device of the fifth aspect is the same as that of the first to fourth aspects, further comprising a spraying device that sprays abrasives, and the spraying device is capable of spraying the abrasives collected in the collection tank. [Effects of the Invention]

[0015] The present invention is constructed and operates as described above, and therefore can provide a blasting device that can further purify the sucked air. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. [Figure 2] FIG. [Figure 3] A is a front view of the filter unit, B is a cross-sectional view of the filter unit, C is a side view of the filter unit, and D is a plan view of the filter unit. [Figure 4] 1A is a plan view of the ejection device, B is a left side view of the ejection device, C is a front view of the ejection device, and D is a right side view of the ejection device. [Figure 5] FIG. 1 is a conceptual diagram of a blasting device.

[0017] The blasting device 10 of this embodiment will be described. The blasting device 10 can purify the discharged air A by taking in the abrasive material P used during blasting, the dust P1 generated by spraying the abrasive material P, the fine dust P2 finer than the dust P1, and the even finer fine particles P3 together with the air A.

[0018] The blasting machine 10 of this embodiment further includes a spraying device 200 that sprays abrasive P. The spraying device 200 includes an abrasive storage tank 210 that has an abrasive supply port 220 that supplies recovered abrasive P, which will be described later. The spraying device 200 is connected to a compressed air section 230 that supplies compressed air via an air dryer 240 that dries the compressed air. Note that a power source 300 for these components may be installed in advance.

[0019] The abrasive supply port 220 of the spraying device 200 can supply used abrasive P collected in the collection tank 20 described below, and the collected used abrasive P is sprayed together with the abrasive P by compressed air ejected from the compressed air unit 230 from the spraying device 200 via the ejection pipe 240. This may allow a worker to spray the abrasive P onto the surface of steel or concrete that constitutes roads, bridges, etc., to perform a so-called blasting process to remove rust and films that have deteriorated over time. Needless to say, not only used abrasive P but also unused abrasive P can be supplied.

[0020] Generally, it is known that the abrasive material P has a particle size of 0.7 to 0.8 millimeters, the dust P1 has a particle size of 10 to 20 micrometers, the fine dust P2 has a particle size of 2 micrometers, and the fine particles P3 have a particle size of 0.3 micrometers.

[0021] The blasting device 10 of this embodiment has a collection tank 20, a cyclone unit 40, a dust collector 60, a filter unit 80, and a vacuum pump 90 in order to purify the discharged air A as described above.

[0022] The blasting device 10 may also have a suction hose 100, a second suction hose 120, a third suction hose 130, a fourth suction hose 140, a fifth suction hose 150, and an exhaust port 160. These suction hoses are arranged so that intake air communicates with each of the components of the collection tank 20, the cyclone unit 40, the dust collector 60, the filter unit 80, and the vacuum pump 90, as will be described later.

[0023] The vacuum pump 90 exerts suction force by negative pressure on the above-mentioned suction hose 100, second suction hose 120, third suction hose 130, and fourth suction hose 140, and the sucked air A passes through the fifth suction hose 150 and is discharged from the exhaust port 160.

[0024] The recovery tank 20 is connected to a suction hose 100. The suction hose 100 uses the negative pressure of a vacuum pump 90 to suck air A containing abrasive P, dust P1, fine dust P2, and fine particles P3 into the recovery tank 20. The recovery tank 20 has a top plate 21, a partition 22 hanging down from the top plate 21, and a retention section 23 below. Used abrasive P sucked from the suction hose 100 collides with the partition 22, causing it to fall. The abrasive P is then retained in the retention section 23, allowing it to be recovered. The collected dust P1, fine dust P2, and fine particles P3 other than the abrasive P are discharged from a second suction hose 120. The recovered abrasive P can be supplied to an abrasive supply port 220 of the ejection device 200 for reuse.

[0025] The cyclone unit 40 is connected to one end 121 of a second suction hose 120. The other end 122 of the second suction hose 120 is connected to the collection tank 20. The cyclone unit 40 also has a centrifugal separation unit 45 that performs centrifugation, and a dust collection retention unit 50 that retains the dust P1.

[0026] The dust P1 separated in the collection tank 20, and the fine dust P2 and fine particles P3 that are finer than the dust, can be separated in the centrifugal separation section 45 of the cyclone section 40. The dust P1 may contain pieces of coating removed by the abrasive P, and the dust P1 falls into the dust collection retention section 50 and can be collected. In this way, the dust P1 is removed by the cyclone section 40 and can be safely disposed of.

[0027] That is, the dust P1 sucked into the second suction hose 120, and the fine dust P2 and fine particles P3 that are finer than the dust P, are supplied to the cyclone unit 40, where they are separated into the dust P1 and the fine dust P2 and fine particles P3 that are finer than the dust P1, and the dust P1 falls into the dust collection retention unit 50, where it can be retained and removed. Note that the fine dust P2 and fine particles P3 may not fall into the dust collection retention unit 50 and may flow out from the third suction hose 130. As described above, dust P1 is known to have a particle size of 10 to 20 micrometers, so that dust of this particle size is collected by the cyclone unit 40, and particles of smaller particle sizes can be collected by the dust collector 60 and the filter unit 80.

[0028] The dust collector 60 is connected to one end 131 of a third suction hose 130. The other end 132 of the third suction hose 130 is connected to the cyclone unit 40.

[0029] Dust collector 60 has a plurality of cylindrical filters 65 disposed therein, and these filters 65 adsorb fine dust P2 that has flowed out without being collected by cyclone unit 40. That is, fine dust P2 that cannot be captured by cyclone unit 40 flows into dust collector 60 via third suction hose 130. The fine dust P2 that has flowed into dust collector 60 is captured by the plurality of cylindrical filters 65 therein, and relatively clean air A containing fine particles P3 flows out into fourth suction hose 140, which will be described later.

[0030] As mentioned above, dust P2 is known to have a particle size of 2 micrometers, so particles of that size can be collected by the dust collector 60, and particles smaller than that can be collected by the filter section 80.

[0031] One end 141 of the fourth suction hose 140 is connected to the vacuum pump 90, and the other end 142 is connected to the dust collector 60. The fourth suction hose 140 exerts suction force due to the negative pressure of the vacuum pump 90. One end 151 of the fifth suction hose 150 is connected to the filter unit 80, and the other end 152 is connected to the vacuum pump 90. The other end 152 of the fifth suction hose 150 is connected to the filter unit 80. The filter unit 80 preferably has a HEPA filter (High Efficiency Particulate Air filter) 89, which will be described later. The HEPA filter 89 may be able to capture 99.97 percent or more of fine particles P3 with a particle size of 0.3 micrometers.

[0032] The filter unit 80 has a box-shaped housing 81. The housing 81 has a top surface 82 disposed thereon, and one end 151 of a fifth suction hose 150 is connected to the top surface 82. The housing 81 also has a sloped portion 83 that slopes downward from the top surface in a side view.

[0033] The housing 81 also has a door portion 85 that can be opened and closed. The housing 81 also has a side portion 86 on its side. A HEPA filter 89 can be placed inside the housing 81. The side portion 86 also has a differential pressure gauge 86a. The differential pressure gauge 86a detects the difference in pressure before and after the HEPA filter 89, and serves as an indication of when to replace the HEPA filter 89.

[0034] The HEPA filter 89 is preferably an ultra-high airflow HEPA filter, preferably one with a rated airflow of 50 cubic meters per second. As mentioned above, the blasting device 10 of this embodiment draws in outside air, and there are cases where a large airflow is required.

[0035] Furthermore, when the HEPA filter 89 is disposed inside the housing 81, the HEPA filter 89 can be disposed so as to be sandwiched between the HEPA filter attachment members 89a, 89a.

[0036] The relatively clean exhaust air containing fine particles P3 that flows into the fourth suction hose 140 flows into the filter unit 80. The filter unit 80 can capture the fine particles P3 contained in the relatively clean exhaust air. As described above, when a so-called HEPA filter 89 is used for the filter unit 80, it can capture more than 99.97 percent of fine particles with a particle size of 0.3 micrometers, so it can capture most fine particles. The filter unit 80 is connected to the exhaust port 160, and clean air A can be discharged from the exhaust port 160.

[0037] Specifically, relatively clean exhaust air flows in through fifth suction hose 150 connected to top panel 82. This relatively clean air A may contain fine particles P3, and the air A and fine particles P3 collide with inclined surface 83, falling vertically downward, changing their flow direction horizontally, and the fine particles P3 are sucked into HEPA filter 89. At this time, the fine particles P3 contained in the relatively clean air A can be captured by HEPA filter 89. Furthermore, since the air A that becomes exhaust after passing through HEPA filter 89 has fine particles P3 captured by HEPA filter 89, even cleaner air A is discharged from exhaust port 160. In this way, when HEPA filter 89 is installed in filter unit 80, it may be possible to capture more than 99.97 percent of fine particles P3 with a particle size of 0.3 micrometers. Therefore, it goes without saying that particles with a particle size of 2 micrometers or less that flow out of dust collector 60 can also be collected by filter unit 80.

[0038] As described above, the blasting device 10 of this embodiment has the collection tank 20, cyclone section 40, dust collector 60, and filter section 80, which can collect abrasive material P with a particle size of 0.7 to 0.8 millimeters, dust P1 with a particle size of 10 to 20 micrometers, fine dust P2 with a particle size of 2 micrometers, and fine particles P3 with a particle size of 0.3 micrometers, respectively, so that the air A containing these materials sucked in from the suction hose 100 can be further purified and then discharged. [Explanation of symbols]

[0039] 10 Blasting Equipment 20 Recovery Tank 40 Cyclone Section 60 Dust collector 80 Filter section 89 HEPA filter 90 Vacuum Pump 100 suction hose 120 Second suction hose 130 Third suction hose 140 4th suction hose 150 5th suction hose 160 exhaust port 200 Squirt device

Claims

1. a recovery tank into which the abrasive, dust, and fine dust and fine particles finer than the dust flow together with air and which recovers the abrasive; a cyclone section that collects the dust from the dust, fine dust, and fine particles that flow out of the collection tank; a dust collector that collects the fine dust from the fine dust and fine particles flowing out of the cyclone unit; a filter unit that collects fine particles flowing out from the dust collector, A blasting device that discharges the air from the filter portion.

2. A recovery tank into which the abrasive, dust, and fine dust and particles finer than the dust flow together with air and into which the abrasive is recovered; a cyclone section that collects the dust from the dust, fine dust, and fine particles that flow out of the collection tank; a dust collector that collects the fine dust from the fine dust and fine particles flowing out of the cyclone unit; a filter unit that collects fine particles flowing out from the dust collector, The filter unit has a HEPA filter, A blasting device that exhausts the air through the HEPA filter.

3. A recovery tank into which the abrasive, dust, and fine dust and particles finer than the dust flow together with air and into which the abrasive is recovered; a cyclone section that collects the dust from the dust, fine dust, and fine particles that flow out of the collection tank; a dust collector that collects the fine dust from the fine dust and fine particles flowing out of the cyclone unit; a filter unit that collects fine particles flowing out from the dust collector; a vacuum pump that sucks the abrasive, the dust, fine dust finer than the dust, and fine particles together with air; A blasting device that discharges the air from the filter portion.

4. A recovery tank into which the abrasive, dust, and fine dust and particles finer than the dust flow together with air and into which the abrasive is recovered; a cyclone section that collects the dust from the dust, fine dust, and fine particles that flow out of the collection tank; a dust collector that collects the fine dust from the fine dust and fine particles flowing out of the cyclone unit; a filter unit that collects fine particles flowing out from the dust collector; a vacuum pump that sucks the abrasive, the dust, fine dust finer than the dust, fine particles, and air; The filter unit has a HEPA filter, A blasting device that exhausts the air through the HEPA filter.

5. a spraying device that sprays the abrasive material; 5. The blasting machine according to claim 1, wherein the ejection device is capable of ejecting the abrasive collected in the collection tank.

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