Dust collecting circulation device, dust collecting circulation method, and dust collecting circulation system

Abstract

To provide a dust collecting circulation device, a dust collecting circulation method, and a dust collecting circulation system that are compatible with both wet type work and dry type work.SOLUTION: A dust collecting circulation device includes: a power supply circuit for connecting a rotation motor circuit for supplying power to a rotation motor 160 for operating a rotary tool 100 and a pump motor circuit for supplying power to a pump motor for operating a feed pump to a power supply in series; a bypass circuit for connecting the rotation motor circuit to the power supply in series while bypassing the pump motor circuit; and a changeover switch 212 for changing over the circuit between the power supply circuit and the bypass circuit.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a dust collection and circulation device, a dust collection and circulation method, and a dust collection and circulation system, and in particular to a dust collection and circulation device, a dust collection and circulation method, and a dust collection and circulation system equipped with a supply pump provided inside a housing and supplying liquid via a supply hose from a water tank to a workpiece cut or ground by a rotary tool rotating a rotating wheel, and dust collection means for collecting a mixture of dust generated from the workpiece cut or ground by the rotary tool and the liquid supplied by the supply pump in a filtering means provided inside the housing via the dust collection hose, and returning the filtered liquid to the water tank. [Background technology]

[0002] Conventionally, disc grinders have been used as tools that rotate a circular disc at high speed. By rotating the disc at high speed with a disc grinder, materials can be scraped or polished.

[0003] For example, by rotating a disk-shaped grindstone as a disk, it is possible to cut, shape, and polish metal. Also, by attaching a disk-shaped grindstone to a cup brush and rotating it, it is possible to remove rust from large surfaces such as metal surfaces, or to remove old paint when repainting.

[0004] In addition, because disc grinders rotate the disc at high speed, there is a risk of injury if the hand comes into contact with the rotating disc, injury if the cut material hits the body, or injury if hair or clothing gets caught in the rotating shaft. For this reason, disc grinders are fitted with a cover that completely covers the side and peripheral side of the rotating disc that are not used for grinding.

[0005] Also, by completely covering the side surface and the circumferential surface of the rotating disk that are not used for grinding, it is possible to prevent scattering of grinding dust, and by connecting a suction port provided in a part of the cover to a suction device using a hose or the like, the grinding dust can be sucked in and collected from the suction port (see, for example, Patent Document 1). This type of work, in which grinding dust including the coating film that has been ground and peeled off is sucked in by a dust collector, is called dry work.

[0006] However, in dry work using the device disclosed in Patent Document 1, the surface to be ground is usually ground while the disc grinder is moving, so there is a risk that the cover may come off the surface to be ground when the disc grinder is moved. If the cover comes off the surface to be ground in this way, dust will float around.

[0007] Therefore, a dust collection device has been developed that not only sucks the grinding dust, including the coating film peeled off by grinding, into a dust collector through a through opening and a dust collection cover like the dry work using the device disclosed in Patent Document 1, but also sprays water into the inside of the dust collection cover and collects the dust generated by cutting or grinding the workpiece with a rotating disk together with the sprayed water (see, for example, Patent Document 2). Work like this, in which the grinding dust is sucked in as sludge that does not float due to the sprayed water, is called wet work. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] JP 2000-202777 A [Patent Document 2] JP 2020-157427 A Summary of the Invention [Problem to be solved by the invention]

[0009] However, in the wet work disclosed in Patent Document 2, water is sprayed from a spray nozzle into the dust collection cover, and the sprayed water and sludge can cause water leakage, so wet work cannot be used in places where bringing in water is prohibited.

[0010] For example, in a server room where multiple computers, control devices, and other precision equipment are installed, if moisture gets into the precision equipment, it can cause a short circuit in the equipment, resulting in the corruption of important data.

[0011] In places where bringing in moisture is prohibited, such as server rooms where this precision equipment is installed, wet work cannot be carried out, so dry work such as that disclosed in Patent Document 1 has to be adopted.

[0012] In other words, the equipment that can be used in locations where it is possible to bring in water is different from that in locations where it is prohibited, and in order for contractors to handle work in both locations, they must prepare two types of equipment, one for wet work and one for dry work, which creates problems such as increased capital expenditures and increased storage space required to store these items.

[0013] Even if either wet work equipment or dry work equipment is brought to the construction site depending on the conditions, it is possible that when work is about to begin, it may turn out that bringing in water is actually prohibited.

[0014] In this case, it would be fine if equipment for dry work had been brought in, but if equipment for wet work had been brought in, the equipment for dry work that had been brought in would not be usable and work would not be able to be carried out.

[0015] At this time, it is possible to carry out the work without using water in the wet work equipment that has been brought in, but this would mean working while the pump for supplying water is running idle, which could lead to damage to the pump.

[0016] One possible solution would be to bring in equipment for wet work and equipment for dry work to the construction site and select the equipment at the construction site based on the conditions there; however, this would increase labor costs since both types of equipment would have to be brought to the construction site.

[0017] The present invention has been made in consideration of the above points, and an object of the present invention is to provide a dust collection and circulation device, a dust collection and circulation method, and a dust collection and circulation system that are compatible with both wet work and dry work. [Means for solving the problem]

[0018] In order to solve the above problem, the present invention provides a dust collection and circulation device comprising: a supply pump provided inside a housing for supplying liquid via a supply hose from a water tank to a workpiece being cut or ground by a rotary tool rotating a rotating wheel; and dust collection means for collecting a mixture of dust generated from the workpiece cut or ground by the rotary tool and the liquid supplied by the supply pump through a dust collection hose in a filtering means provided inside the housing and returning the filtered liquid to the water tank. The dust collection and circulation device is characterized in that it further comprises a switching means for switching between a rotary motor circuit that supplies power to a rotary motor that operates the rotary tool, a pump motor circuit that supplies power to a pump motor that operates the supply pump, and a power supply circuit that connects the rotary motor circuit in series to a power supply, and a bypass circuit that bypasses the pump motor circuit and connects the rotary motor circuit in series to a power supply.

[0019] This allows the switching means to switch between a power supply circuit that connects in series to the power source a rotary motor circuit that supplies power to the rotary motor that operates the rotary tool and a pump motor circuit that supplies power to the pump motor that operates the supply pump, and a bypass circuit that bypasses the pump motor circuit and connects the rotary motor circuit in series to the power source.

[0020] The present invention also provides a dust collection and circulation method using a dust collection and circulation device including a supply pump provided inside a housing and supplying liquid via a supply hose from a water tank to a workpiece cut or ground by a rotary tool rotating a rotating wheel, and dust collection means for collecting a mixture of dust generated from the workpiece cut or ground by the rotary tool and the liquid supplied by the supply pump through a dust collection hose in a filtering means provided inside the housing and returning the filtered liquid to the water tank, the dust collection and circulation method comprising a step of switching between a rotary motor circuit that supplies power to a rotary motor that operates the rotary tool, a pump motor circuit that supplies power to a pump motor that operates the supply pump, and a power supply circuit that connects the rotary motor circuit in series to a power supply, and a bypass circuit that bypasses the pump motor circuit and connects the rotary motor circuit in series to a power supply.

[0021] This allows the switching means to switch between a power supply circuit that connects in series to the power source a rotary motor circuit that supplies power to the rotary motor that operates the rotary tool and a pump motor circuit that supplies power to the pump motor that operates the supply pump, and a bypass circuit that bypasses the pump motor circuit and connects the rotary motor circuit in series to the power source.

[0022] The present invention also provides a dust collection and circulation system comprising: a rotating tool that cuts or grinds a workpiece by rotating a rotating wheel; a supply pump that is provided inside a housing and supplies liquid from a water tank via a supply hose to the workpiece that is cut or ground by the rotating tool that rotates the rotating wheel; dust collection means that collects a mixture of dust generated from the workpiece cut or ground by the rotating tool and the liquid supplied by the supply pump in a filtering means provided inside the housing via a dust collection hose, and returns the filtered liquid to the water tank; and a switching means that switches between a rotating motor circuit that supplies power to a rotating motor that operates the rotating tool, a pump motor circuit that supplies power to a pump motor that operates the supply pump, and a bypass circuit that bypasses the pump motor circuit and connects the rotating motor circuit in series to a power source.

[0023] This allows the switching means to switch between a power supply circuit that connects in series to the power source a rotary motor circuit that supplies power to the rotary motor that operates the rotary tool and a pump motor circuit that supplies power to the pump motor that operates the supply pump, and a bypass circuit that bypasses the pump motor circuit and connects the rotary motor circuit in series to the power source. Effect of the Invention

[0024] According to the dust collection and circulation device, dust collection and circulation method, and dust collection and circulation system of the present invention, a switching means switches between a power supply circuit that connects a rotary motor circuit that supplies power to a rotary motor that operates a rotary tool and a pump motor circuit that supplies power to a pump motor that operates a supply pump in series to a power source, and a bypass circuit that bypasses the pump motor circuit and connects the rotary motor circuit in series to a power source, so that when the switching means switches to the power supply circuit, wet work is possible, and when the switching means switches to the bypass circuit, dry work is possible. Therefore, one system or device can be used for both wet work and dry work. [Brief description of the drawings]

[0025] [Figure 1] 1 is a block diagram showing the concept of a dust collection and circulation system according to an embodiment of the present invention; [Diagram 2] FIG. 1 is a diagram showing the configuration of a changeover switch that switches between a power supply circuit that connects in series to a power source a rotary motor circuit that supplies power to a rotary motor that operates a rotary tool and a pump motor circuit that supplies power to a pump motor that operates a supply pump, and a bypass circuit that bypasses the pump motor circuit and connects the rotary motor circuit in series to the power source. [Diagram 3] FIG. 13 is a reference diagram showing a state in which the changeover switch is connected to a bypass circuit. [Figure 4] FIG. 13 is a reference diagram showing a state in which a changeover switch is connected to a power supply circuit. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing the concept of a dust collection and circulation system according to this embodiment. As shown in FIG. 1, the dust collection and circulation system 1000 includes a rotating tool 100 , a dust collection and circulation device 200 , and a suction device 300 .

[0027] The dust collection and circulation system 1000 is for removing, by cutting or grinding, a coating film containing harmful substances such as asbestos, which is an object W to be cut and applied to the wall surface of a building 400, for example.

[0028] The coating material, which is the workpiece W here, is not only applied to the wall surface of the building 400, but may also be applied to floor surfaces, ceilings, pillars, roofs, and other exposed surfaces not shown here, and may be selected arbitrarily. Note that in this embodiment, the following description will be given taking as an example a case where a coating material applied to the wall surface of the building 400 is removed by the dust collection and circulation system 1000.

[0029] The rotary tool 100 includes a tool body 110, a rotary shaft 120, a grinding disk 130, a dust collection cover 140, a power switch 150, and a rotary motor 160 (not shown).

[0030] The tool body 110 is equipped with a rotary motor 160 (not shown), and the rotary shaft 120 is rotated by being driven by the rotary motor 160. A disk-shaped grinding disk 130 is detachably attached to the rotary shaft 120, and the grinding disk 130 rotates by turning on a power switch 150 provided, for example, at the rear of the tool body 110, and cuts or grinds the workpiece W. Moreover, the rotation of the grinding disk 130 is stopped by turning off the power switch 150.

[0031] In addition, an attachment plug 170 (not shown here) is provided at the end of a power cable C that supplies power to a rotary motor 160 for driving the rotation shaft 120 to rotate. The attachment plug 170 is detachably connected to a receiving plug 211 (described later) provided in the dust collection and circulation device 200, and power is supplied via the dust collection and circulation device 200.

[0032] The dust collection cover 140 is intended to prevent the scattering of dust from the workpiece W cut or ground by the rotation of the grinding disk 130, and is formed in a cup shape that covers the top side, which is the side of the rotating shaft 120 to which the grinding disk 130 is attached, of the circular grinding disk 130 attached to the rotating shaft 120, and its peripheral side surfaces, and is open on the bottom side, which is the opposite side to the top side. Specifically, the dust collection cover 140 has an upper surface portion connected to the tool body 110 with the rotating shaft 120 passing therethrough, and a peripheral side surface portion extending downward from the peripheral edge of the upper surface portion.

[0033] The grinding disk 130 and the dust-collecting cover 140 are adjusted to positions where there is no step between the surface of the workpiece W to be cut or ground and the bottom side, which is the opposite side of the top side of the dust-collecting cover 140. This open bottom side allows the rotating, disk-shaped grinding disk 130 to come into contact with the workpiece W, and cut or grind the coating applied to the wall surface of the workpiece W.

[0034] The dust collection cover 140 also has an injection nozzle 141 connected to a supply hose S for supplying water from the dust collection and circulation device 200, and a dust collection port 142 connected to a dust collection hose D through which the dust collection and circulation device 200 sucks in dust generated by cutting or grinding the workpiece W.

[0035] The injection nozzle 141 is for injecting water supplied from the dust collection and circulation device 200 via the supply hose S. The injection nozzle 141 is provided on the upper surface side of the dust collection cover 140 so that the water can be injected from above the rotating grinding disc 130, for example.

[0036] The spray nozzle 141 can be appropriately selected from a straight nozzle that sprays the supplied water in a straight line, a shower nozzle that sprays the supplied water in a shower-like form, or a mist nozzle that sprays the supplied water in a mist-like form.

[0037] The water supplied by the injection nozzle 141 is injected from above the rotating grinding disk 130, which breaks down the water into fine particles, thereby moistening the inside of the dust-collecting cover 140. Even if dust is generated inside the dust-collecting cover 140 in this moist state, the finely divided water adsorbs the dust, thereby preventing the generated dust from scattering around.

[0038] The dust collection port 142 is for the dust collection and circulation device 200 to suck up dust generated by cutting or grinding the workpiece W through the dust collection hose D. The dust collection port 142 is provided on the upper surface side of the dust collection cover 140 so that dust generated inside the dust collection cover 140 can be sucked in from above the rotating grinding disk 130, for example.

[0039] The dust collection port 142 is an opening formed with a diameter large enough to efficiently suck in the air inside the dust collection cover 140 and collect the dust and finely divided water generated inside the dust collection cover 140, and a dust collection hose D is removably connected to it.

[0040] An injection nozzle 141 connected to a supply hose S and a dust collection port 142 connected to a dust collection hose D are disposed on the left and right sides with a gap between them, with the rotation shaft 120 on which the grinding disk 130 is attached being the center.

[0041] The positions of the injection nozzle 141 connected to the supply hose S and the dust collection port 142 connected to the dust collection hose D can be set arbitrarily as long as they are positions where water can be supplied and where dust can be sucked. The rotary tool 100 can be used by attaching a member such as an auxiliary handle as necessary.

[0042] The dust collection and circulation device 200 is a device for collecting dust and sludge, which is water with dust adsorbed thereto, generated by cutting or grinding the workpiece W with the tool body 110, filtering the collected dust and water with dust adsorbed thereto to separate the water and sludge, and circulating the water by supplying the separated water back to the tool body 110, and includes a main body 210, a supply pump 220, a water storage tank 230, and a filtering means 240. The water storage tank 230 is a hollow cylinder with a closed lower side so that water can be stored therein, and is configured such that the open upper side is closed by the main body 210 to form an enclosed space.

[0043] The main body 210 is for storing various devices and the like in its internal space, and is provided with a receiving plug 211 , a changeover switch 212 as a switching means, a suction port 213 , a cover portion 214 , and a discharge port 215 .

[0044] The receiving plug 211 is for connection to an attachment plug 170 as a connector provided at the end of a power cable C that supplies power to a rotary motor 160 for driving and rotating the rotary shaft 120 of the rotary tool 100.

[0045] The dust collection and circulation device 200 is connected to a power source such as a commercial power source or a generator (not shown). The receiving plug 211 is a connection device for supplying power from the power source to connected equipment. Specifically, an attachment plug 170 provided at the end of a power cable C of the rotating tool 100 is inserted into the receiving plug 211, and the power obtained from the power source is supplied to the rotating tool 100. This enables the rotating tool 100 to rotate.

[0046] The changeover switch 212 is for switching between circuits. Specifically, the changeover switch 212 can switch between a power supply circuit that connects in series to a power source a rotary motor circuit that supplies power to the rotary motor 160 that operates the rotary tool 100 and a pump motor circuit that supplies power to a pump motor 223 (not shown here) that operates a supply pump 220 (described later), and connects in series to the power source a bypass circuit that bypasses the pump motor circuit and connects the rotary motor circuit in series to the power source.

[0047] When the changeover switch 212 is connected to the power supply circuit, the tool body 110 starts operating and at the same time the pump motor 223 that operates the supply pump 220 starts operating. That is, the supply pump 220 starts operating in conjunction with the tool body 110.

[0048] When the changeover switch 212 is connected to the bypass circuit, the pump motor 223 does not operate even if the tool body 110 operates because the pump motor circuit is bypassed. In other words, even if the tool body 110 operates, the supply pump 220 does not operate.

[0049] Therefore, in the case of wet work that requires the supply of water, the changeover switch 212 is connected to the power supply circuit, and in the case of dry work that does not require the supply of water, the changeover switch 212 is connected to the bypass circuit. This makes it possible for one dust collection and circulation device 200 to handle both wet and dry work.

[0050] Suction port 213 is provided on the underside of main body 210, and is an opening provided for sucking air inside water tank 230 attached to the underside of main body 210. Suction port 213 is connected to exhaust port 215 inside main body 210 by a connection hose, and air inside water tank 230 is sucked by suction device 300 connected to exhaust port 215 via suction hose V.

[0051] The cover part 214 is for covering the suction port 213 so that the suction port 213 does not directly suck in dust, water vapor, etc., during wet work, for example, and is shaped to cover the water tank side of the suction port 213 and have openings on the circumferential surface at a distance from it. This makes it possible to prevent problems such as clogging of the suction port 213.

[0052] Also, during dry work, by covering the water tank side of suction port 213 and having cover portion 214 with openings on its spaced circumferential surface, suction port 213 can be prevented from directly sucking in dust, and problems such as clogging of suction port 213 can be suppressed.

[0053] The supply pump 220 is intended to supply the water stored inside the water storage tank 230 to the rotary tool 100. By operating a pump motor 223 (not shown here), the water storage tank 230 pumps up the water stored inside and then supplies the pumped water to the rotary tool 100.

[0054] A supply hose S is connected to a supply port 221 on the supply side of the supply pump 220 , and the supply port 221 of the supply pump 220 and the injection nozzle 141 of the rotary tool 100 are connected via the supply hose S.

[0055] A suction hose P is connected to a suction port 222 on the suction side of the supply pump 220, and filtered water is pumped up from the suction side end of the suction hose P arranged inside the water storage tank 230.

[0056] The water tank 230 is a hollow cylinder whose lower side is closed so that water can be stored therein, and whose open upper side is closed by the main body 210 so as to form an enclosed space. A base 231 for placing the filtering means 240 is disposed on the inner bottom of the water storage tank 230, and the filtering means 240 is placed on the base 231.

[0057] A pumping hose mounting hole 232 is provided on a portion of the peripheral surface of the water storage tank 230 for introducing the pumping hose P connected to the supply pump 220 into the interior of the water storage tank 230, and the pumping hose P is introduced into the interior of the water storage tank 230 through the pumping hose mounting hole 232.

[0058] In this embodiment, an example is described in which a part of the water storage tank 230 is provided outside the dust collection and circulation device 200, but the entire suction hose P may be integrated inside the dust collection and circulation device 200.

[0059] In addition, a dust collection hose mounting hole 233 is provided on a portion of the peripheral surface of the water storage tank 230 for introducing a dust collection hose D connected to the rotary tool 100 into the interior of the water storage tank 230, and the dust collection hose D is introduced into the interior of the water storage tank 230 through the dust collection hose mounting hole 233.

[0060] A filtering means 240 is connected to a dust collection hose D introduced inside the water storage tank 230, and filters and separates water from dust collected through the dust collection hose D and sludge, which is water that has adsorbed dust.

[0061] There is no need to limit the material or shape of the filtering means 240 as long as it can filter and separate water from the dust and sludge collected through the dust collection hose D. In this embodiment, a bag-shaped dust bag made of a mesh material is used.

[0062] The suction device 300 is detachably connected to the exhaust port 215 of the dust collection and circulation device 200 via a suction hose V, and serves to suck air from inside the water tank 230, which is sealed by the water tank 230 and the main body 210.

[0063] In addition, by detachably connecting the exhaust port 215 of the dust collection and circulation device 200 via the suction hose V, the contractor can select and connect a suction device 300 that he or she owns. For example, by selecting a suction device 300 with different suction power for wet work and dry work, the work can be performed more efficiently.

[0064] The suction device 300 is a vacuum device for discharging air from inside the water tank 230 using power supplied by a power supply device not shown here, and is equipped with, for example, a suction port 310 for taking in air from inside the water tank 230 by connecting a suction hose V to the inside of the suction device 300 main body, a HEPA filter 320 for purifying the air taken in by the suction device 300, and an exhaust port 330 with a silencer function for expelling normalized air.

[0065] As a specific example, in the suction device 300, an electric motor connected to a power source (not shown) is driven to rotate a Roots blower (not shown), and the air inside the water tank 230 that has been sucked into the suction device 300 via the suction hose V is discharged to the outside air via the exhaust port 330, generating a suction force at the suction port 310.

[0066] When the suction device 300 is operated, the air inside the water storage tank 230 is discharged to the outside air through the suction hose V. This creates a negative pressure inside the water storage tank 230. As a result of the negative pressure inside the water storage tank 230, the air in the rotary tool 100 is collected through the dust collection hose D.

[0067] The rotating tool 100 side of the dust collection hose D is connected to the dust collection cover 140 of the rotating tool 100, and collects dust generated when the tool body 110 cuts or grinds the workpiece W, and sludge, which is water that has absorbed the dust.

[0068] The dust and sludge collected inside the water storage tank 230 are filtered by the filtering means 240, and the separated water is stored inside the water storage tank 230 by the action of gravity. At this time, since the filtering means 240 is placed on the base 231, the harmful substances accumulated in the filtering means 240 do not come into contact with the water stored inside the water storage tank 230. This prevents the harmful substances from excessively dissolving into the water. Therefore, it is desirable that the height of the base 231 is higher than the water surface stored inside the water storage tank 230.

[0069] Water stored inside the water storage tank 230 is pumped up via a pumping hose P connected to the supply pump 220, and is supplied to the rotary tool 100 via a supply hose S. In this way, the water is circulated.

[0070] At this time, since the filtering means 240 is placed on the base 231, it does not come into contact with the pumping-side end of the suction hose P connected to the supply pump 220. This allows the supply pump 220 to pump up water normally without the filtering means 240 blocking the pumping-side end of the suction hose P.

[0071] Next, examples of work procedures for dry work and wet work will be described below. First, in the dry operation, a power cable E (not shown) provided on the dust collection and circulation device 200 is connected to a commercial power source or a power source such as a generator.

[0072] Next, the attachment plug 170 of the power cable C of the rotary tool 100 is inserted into the receiving plug 211 provided on the dust collection and circulation device 200 . Since no water is used in dry operation, there is no need to supply water from the supply pump 220. Therefore, the changeover switch 212 is connected to the bypass circuit.

[0073] A power cable (not shown) provided on the suction device 300 is connected to a power source such as a commercial power source or a generator, and the power switch 150 of the suction device 300 is turned ON. This starts suction by the suction device 300, and the inside of the water tank 230 becomes a negative pressure state.

[0074] By turning on the power switch 150 of the rotating tool 100, the grinding disk 130 rotates, making it possible to cut or grind the workpiece W. The rotating tool 100 is brought into contact with the workpiece W, or the power switch 150 of the rotating tool 100 is turned on while the rotating tool 100 is in contact with the workpiece W, and the workpiece W is cut or ground.

[0075] At this time, the inside of the dust collection cover 140 of the rotary tool 100 is in a negative pressure state in conjunction with the inside of the water storage tank 230, and the air inside the dust collection cover 140 is sucked into the inside of the water storage tank 230 by the connected dust collection hose D.

[0076] The dust-containing air sucked into the water tank 230 is filtered by the filtering means 240, and the separated air is sucked by the suction device 300, and the air normalized through the HEPA filter 320 is discharged to the outside air through the exhaust port 330.

[0077] As described above, in dry work, the dust generated by the rotary tool 100 cutting or grinding the workpiece W is filtered by the filtering means 240, the filtered air is sucked in by the suction device 300, and the air normalized by the HEPA filter 320 is discharged to the outside air, so that the dust does not leak to the outside. In addition, since no water is used, the dust collection and circulation system 1000 of this embodiment can cut or grind and remove coatings containing harmful substances such as asbestos even in places where bringing in water is prohibited, such as server rooms.

[0078] Next, in the wet operation, a power cable E (not shown) provided on the dust collection and circulation device 200 is connected to a commercial power source or a power source such as a generator, in the same manner as in the dry operation. Next, the attachment plug 170 of the power cable C of the rotary tool 100 is inserted into the receiving plug 211 provided on the dust collection and circulation device 200 . Since water is used in the wet work, it is necessary to supply water by the supply pump 220. Therefore, the changeover switch 212 is connected to the power supply circuit.

[0079] A power cable (not shown) provided on the suction device 300 is connected to a power source such as a commercial power source or a generator, and the power switch 150 of the suction device 300 is turned ON. This starts suction by the suction device 300, and the inside of the water tank 230 becomes a negative pressure state.

[0080] By turning on the power switch 150 of the rotary tool 100, the grinding disk 130 rotates, making it possible to cut or grind the workpiece W. In addition, the supply pump 220 is driven in conjunction with the driving of the rotary tool 100, and the supply of water to the rotary tool 100 is started.

[0081] The rotating tool 100 is brought into contact with the workpiece W, or the power switch 150 of the rotating tool 100 is turned ON while the rotating tool 100 is in contact with the workpiece W, to cut or grind the workpiece W. This enables the rotating tool 100 to cut or grind the workpiece W while the inside of the dust collection cover 140 is in a wet state.

[0082] At this time, the inside of the dust collection cover 140 of the rotary tool 100 is in a negative pressure state in conjunction with the inside of the water storage tank 230, and the air inside the dust collection cover 140 is sucked into the inside of the water storage tank 230 by the connected dust collection hose D.

[0083] The dust and sludge sucked into the water storage tank 230 are filtered by the filtering means 240, and the separated air is sucked by the suction device 300, and the air normalized through the HEPA filter 320 is discharged to the outside air through the exhaust port 330. Furthermore, the water filtered and separated by the filtering means 240 is stored inside the water storage tank 230. The water stored in the water storage tank 230 is supplied to the rotary tool 100 by the supply pump 220 which is driven in conjunction with the driving of the rotary tool 100 .

[0084] In this way, in wet work, the filtering means 240 filters the dust and sludge generated when the rotating tool 100 cuts or grinds the workpiece W, the filtered air is sucked in by the suction device 300, and the air normalized by the HEPA filter 320 is discharged to the outside air. Furthermore, the supply pump 220 supplies the water filtered by the filtering means 240 to the rotating tool 100, so that dust does not leak out to the outside. Furthermore, since water circulates within the dust collection and circulation system 1000, coatings containing harmful substances such as asbestos can be removed by cutting or grinding using a small amount of water.

[0085] As described above, in the dust collection and circulation system 1000 of this embodiment, wet work is possible when the changeover switch 212 is connected to the power supply circuit, and dry work is possible when the switching means is connected to the bypass circuit. Therefore, the dust collection and circulation system 1000 of this embodiment alone can handle both wet work and dry work.

[0086] This eliminates the need for contractors to prepare two types of equipment, one for wet work and one for dry work, thereby reducing the need for additional capital and storage space.

[0087] FIG. 2 is a diagram showing the configuration of a changeover switch that switches between a power supply circuit that connects in series to a power source a rotary motor circuit that supplies power to a rotary motor 160 that operates a rotary tool and a pump motor circuit that supplies power to a pump motor 223 that operates a supply pump, and a bypass circuit that bypasses the pump motor circuit and connects the rotary motor circuit in series to the power source.

[0088] As shown in FIG. 2, the rotary tool 100 is equipped with a rotary motor 160 for rotating the rotary shaft 120. An attachment plug 170 as a connector provided at the end of a power cable C for supplying power to the rotary tool 100 is detachably connected to a receiving plug 211 (described later) provided in the dust collection and circulation device 200, and power is supplied via the dust collection and circulation device 200.

[0089] A power switch 150 is provided in a rotary motor circuit that supplies power to a rotary motor 160 that operates the rotary tool 100. The power switch 150 can be used to switch between energizing and deenergizing the rotary motor circuit.

[0090] By turning on the power switch 150 and energizing the rotary motor circuit, the rotary motor 160 rotates and rotates the rotary shaft 120. By turning off the power switch 150 and interrupting the rotary motor circuit, the rotary motor 160 stops and the rotary shaft 120 stops.

[0091] The dust collection and circulation device 200 is equipped with a pump motor 223 that operates the supply pump 220, and a power cable E that supplies power to the dust collection and circulation device 200 is connected to a power source Q, whereby power is supplied to the dust collection and circulation device 200.

[0092] The dust collection and circulation device 200 is also provided with a changeover switch 212 that switches between a power supply circuit that connects in series to a power source a rotary motor circuit that supplies power to the rotary motor 160 that operates the rotary tool 100 and a pump motor circuit that supplies power to the pump motor 223 that operates the supply pump 220, and a bypass circuit that bypasses the pump motor circuit and connects the rotary motor circuit in series to the power source.

[0093] Specifically, the changeover switch 212 has a common contact 212A, a pump motor contact 212B which is a contact connected to a circuit including the pump motor 223, and a bypass contact 212C which is a contact that is not connected to the pump motor 223 and is connected to a circuit that bypasses the pump motor 223.

[0094] The common contact 212A is connected to the receiving plug 211 via a power line, the pump motor contact 212B is connected to the pump motor 223 via a power line, and the pump motor 223 is connected to a power source Q via a power line. Also, the bypass contact 212C is connected to the power source Q via a power line.

[0095] The changeover switch 212 can switch between a pump motor contact 212B and a bypass contact 212C, and by switching between the pump motor contact 212B and the bypass contact 212C, it is possible to switch between the power supply circuit and the bypass circuit.

[0096] FIG. 3 is a reference diagram showing a state in which the changeover switch is connected to a bypass circuit. As shown in FIG. 3(A), in the changeover switch 212, the common contact 212A and the bypass contact 212C are connected, so that the changeover switch 212 bypasses the pump motor circuit for operating the pump motor 223 and connects the rotary motor circuit for operating the rotary motor 160 in series to the power source Q.

[0097] However, the power switch 150, which controls the power supply to the rotary motor 160 that operates the rotary tool 100, is in a cut-off state, i.e., the power switch 150 is turned OFF, so the rotary motor circuit is cut off by the power switch 150, and since the rotary motor 160 is stopped, the rotary shaft 120 is also stopped.

[0098] Also, as shown in FIG. 3(B), since the common contact 212A and the bypass contact 212C are connected in the changeover switch 212, the changeover switch 212 bypasses the pump motor circuit for operating the pump motor 223 and connects the rotary motor circuit for operating the rotary motor 160 in series to the power source Q.

[0099] The power switch 150, which controls the power supply to the rotary motor 160 that operates the rotary tool 100, is in an energized state, i.e., the power switch 150 is ON, so that the rotary motor circuit is energized by the power switch 150, and the rotary motor 160 is driven, causing the rotary shaft 120 to rotate.

[0100] At this time, since the changeover switch 212 is connected to the bypass circuit, power is not supplied to the pump motor 223 of the supply pump 220 for supplying water stored in the water storage tank 230 to the rotary tool 100. Therefore, the pump motor 223 for supplying water to the rotary tool 100 is not driven. Therefore, dry work that does not require water is possible.

[0101] FIG. 4 is a reference diagram showing a state in which the changeover switch is connected to the power supply circuit. As shown in FIG. 4(A), in the changeover switch 212, the common contact 212A and the pump motor contact 212B are connected, so that the changeover switch 212 connects the pump motor circuit for operating the pump motor 223 in series to the power source Q.

[0102] However, the power switch 150, which controls the power supply to the rotary motor 160 that operates the rotary tool 100, is in a cut-off state, i.e., the power switch 150 is turned OFF, so the rotary motor circuit is cut off by the power switch 150, and since the rotary motor 160 is stopped, the rotary shaft 120 is also stopped.

[0103] Furthermore, since the rotary tool 100, whose rotary motor circuit has been cut off by the power switch 150, is connected to the pump motor circuit by the insertion plug 170 and the receiving plug 211, the power supply to the pump motor 223 is also cut off and the pump motor 223 is also stopped.

[0104] Also, as shown in FIG. 4(B), in the changeover switch 212, the common contact 212A and the pump motor contact 212B are connected, so that the changeover switch 212 connects the pump motor circuit for operating the pump motor 223 in series to the power source Q.

[0105] The power switch 150, which controls the power supply to the rotary motor 160 that operates the rotary tool 100, is in an energized state, i.e., the power switch 150 is ON, so that the rotary motor circuit is energized by the power switch 150, and the rotary motor 160 is driven, causing the rotary shaft 120 to rotate.

[0106] At this time, the supply pump 220 for supplying water stored inside the water storage tank 230 to the rotary tool 100 has power supplied to the pump motor 223 because the changeover switch 212 is connected to the pump motor circuit. Therefore, by driving the pump motor 223 for supplying water to the rotary tool 100, wet work requiring water can be performed.

[0107] As described above, in the dust collection and circulation system 1000 of the present embodiment, the changeover switch 212 Since the power supply circuit and the bypass circuit are switched, when the changeover switch 212 is connected to the power supply circuit, wet work is possible, and when the changeover means is connected to the bypass circuit, dry work is possible. Therefore, the dust collection and circulation system 1000 of this embodiment alone can handle both wet work and dry work.

[0108] This eliminates the need for contractors to prepare two types of equipment, one for wet work and one for dry work, thereby reducing the need for additional capital and storage space.

[0109] Furthermore, when the changeover switch 212 is connected to the power supply circuit, the power supply circuit including the pump motor circuit is energized by turning on the power switch 150 of the rotary tool 100, so that the pump motor 223 is driven or stopped in conjunction with the ON / OFF operation of the rotary tool 100 used for work at hand. This prevents water from being wasted. Therefore, wet work can be performed with less water. [Explanation of symbols]

[0110] 100 Rotary Tools 110 Tool body 120 Rotational Axis 130 Grinding disc 140 Dust collection cover 141 Injection nozzle 142 Dust collection port 150 Power Switch 160 RPM motor 170 Plug 200 Dust collection and circulation equipment 210 Main body 211 Receptacle plug 212 Changeover switch 212A Common Contact 212B Pump motor contacts 212C Bypass Contact 213 Suction port 214 Cover part 215 Outlet 220 Supply Pump 221 Supply port 222 Pumping port 223 Pump motor 230 Water Tank 231 Pedestal 232 Pumping hose attachment hole 233 Dust collection hose attachment hole 240 Filtration means 300 Suction device 310 Suction port 320 HEPA Filter 330 Exhaust port 400 buildings 1000: Dust collection and circulation system C Power Cable D Dust collection hose E Power Cable P Pumping hose Q power supply S Supply Hose V Suction Hose W Workpiece

Claims

1. A dust collection and circulation device comprising: a supply pump provided inside a housing for supplying liquid through a supply hose from a water tank to a workpiece to be cut or ground by a rotary tool rotating a rotary wheel; and dust collection means for collecting a mixture of dust generated from the workpiece cut or ground by the rotary tool and the liquid supplied by the supply pump through a dust collection hose in a filtering means provided inside the housing, and returning the filtered liquid to the water tank, a switching means for switching between a power supply circuit that connects in series to a power source a rotary motor circuit that supplies power to a rotary motor that operates the rotary tool and a pump motor circuit that supplies power to a pump motor that operates the supply pump, and a bypass circuit that bypasses the pump motor circuit and connects the rotary motor circuit in series to the power source; A dust collection and circulation device comprising:

2. The rotary motor circuit includes: The switch means is connected to the switch via a connector that can freely connect and disconnect the switch.

2. The dust collection and circulation device according to claim 1,

3. The housing includes: a suction port provided at an upper portion of the water storage tank for sucking in gas generated by the dust collecting means to create a negative pressure inside the housing; The filtering means is The tank is installed with the bottom raised by the base provided on the water storage section.

2. The dust collection and circulation device according to claim 1,

4. a cover portion that covers the water tank side of the suction port at a distance and has an opening around the periphery; 4. The dust collection and circulation device according to claim 3, further comprising:

5. The cover portion is 5. The dust collecting and circulating device according to claim 4, further comprising a filter on the peripheral surface.

6. a dust collecting means connection portion for detachably connecting the dust collecting means and a suction hose connected to a suction port; 4. The dust collection and circulation device according to claim 3, further comprising:

7. A dust collection and circulation method using a dust collection and circulation device including: a supply pump provided inside a housing for supplying liquid through a supply hose from a water tank to a workpiece to be cut or ground by a rotary tool rotating a rotating wheel; and dust collection means for collecting a mixture of dust generated from the workpiece cut or ground by the rotary tool and the liquid supplied by the supply pump in a filtering means provided inside the housing through a dust collection hose and returning the filtered liquid to the water tank, a step of switching, by a switching means, between a power supply circuit that connects in series to a power source a rotary motor circuit that supplies power to a rotary motor that operates the rotary tool and a pump motor circuit that supplies power to a pump motor that operates the supply pump, and a bypass circuit that bypasses the pump motor circuit and connects the rotary motor circuit in series to the power source; A dust collection and circulation method comprising:

8. A rotary tool that cuts or grinds a workpiece by rotating a rotary wheel; a dust collection and circulation device including: a supply pump provided inside a housing and supplying liquid through a supply hose from a water tank to a workpiece cut or ground by the rotary tool rotating the rotating wheel; a dust collection means for collecting a mixture of dust generated from the workpiece cut or ground by the rotary tool and the liquid supplied by the supply pump through a dust collection hose in a filtering means provided inside the housing, and returning the filtered liquid to the water tank; a power supply circuit for connecting in series to a power source a rotary motor circuit for supplying power to a rotary motor that operates the rotary tool, a pump motor circuit for supplying power to a pump motor that operates the supply pump, and a bypass circuit for connecting the rotary motor circuit in series to a power source by bypassing the pump motor circuit; A dust collection and circulation system comprising:

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