Dust collection circulation device and dust collection circulation system

Abstract

To provide a dust collection circulation device that blocks bubbles generated during passage through a filter.SOLUTION: A dust collection circulation device 100 comprises a bubble blocking mechanism 30 disposed in a lower housing 20. The bubble blocking mechanism includes a lower recessed blocking part 30A opened downward and an upper recessed blocking part 30B isolated from the lower recessed blocking part, supported upward, and opened up. The lower recessed blocking part includes a lower side wall 31 disposed so as to be isolated along the inner surface of the lower housing, and a top plate 32 that is connected to the upper end of the lower side wall and that covers a space surrounded by the lower side wall. The upper recessed blocking part includes a bottom plate 37 in which an air opening 37b isolated from the top plate to serve as an air flow path is formed, and an upper side wall 36 disposed at the peripheral edge of the bottom plate so as to face the inner peripheral surface of the lower housing.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a dust collection and circulation system for performing work such as grinding, cutting, peeling off paint films, and drilling of hard structures such as stone and concrete using cup-shaped rotary tools such as grinders and drills, while collecting dust and circulating it wet, and a dust collection and circulation device used in the dust collection and circulation system. [Background technology]

[0002] A conventional wet dust collection and circulation system includes, for example, a rotary tool having an output shaft to which a rotary wheel for cutting or grinding a workpiece is attached and rotated, a dust collection cover that covers one side of the rotary wheel attached to the output shaft, and a dust collection and circulation device that supplies water to be sprayed on and collects dust generated when the rotary wheel of the rotary tool cuts or grinds the workpiece. A lubricating water circulation drilling system also includes a rotary tool that uses a shaft connected to a bit that serves as a cutting edge for drilling long holes in concrete, and a lubricating water circulation device that supplies water to the bit of the rotary tool and collects dust.

[0003] In the wet dust collection and circulation system, a water supply hose is connected to a dust collection cover that covers the rotating wheel of the rotary tool, and a dust collection hose that collects water and dust is also connected, and water is supplied from a supply tank of the dust collection and circulation device to the dust collection cover through the supply hose by a supply pump.The wet dust collection and circulation system is configured so that a mixture of water and dust (sludge) is collected through the dust collection hose by the dust collection pump, and the collected sludge is stored through a filter, and water is separated from the sludge by the filter and stored in a supply tank (Patent Document 1).In addition, a lubricating water circulation drilling system is configured to drill a long hole in concrete with a bit, collect sludge, and supply and circulate filtered water while supplying and circulating it (Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2020-157427 [Patent Document 2] Japanese Patent Publication No. 2022-184156 Summary of the Invention [Problem to be solved by the invention]

[0005] In the wet dust collection and circulation system and the lubricating water circulation drilling system, the dust generated by cutting or grinding work is mainly composed of paint films and substrates including concrete, which mix with water to form sludge, which is then collected by being sucked into the filter of the dust collection and circulation system together with air. Then, liquids and gases (hereinafter referred to as "liquids, etc.") are filtered by passing through the filter, and the purified water is stored in a supply tank, while solids remain inside the filter.

[0006] In the dust collection and filtering process, when liquid or the like passes through the filter, it foams violently on the filter surface, and the foam gradually accumulates in the supply tank. The foam then reaches the top of the supply tank in a short time and is sucked into the dust collection drive mechanism, such as the dust collection pump.

[0007] In this case, the bubbles sucked into the dust collection drive mechanism may have a negative effect on the dust collection drive mechanism.In addition, the bubbles discharged from the dust collection and circulation device may contain harmful substances contained in the coating, which could unintentionally cause harmful substances to be dispersed.

[0008] The present invention has been made to solve the above problems, and its object is to provide a dust collection and circulation device and a dust collection and circulation system that prevent bubbles generated when passing through a filter from reaching the suction drive unit. [Means for solving the problem]

[0009] To solve the above problems, the present invention provides a dust collection and circulation device comprising a lower housing and an upper housing disposed above the lower housing, in which liquid from a water storage tank in the lower housing is supplied to a machining portion of a workpiece via a supply pump while a rotary tool is used to cut or grind the workpiece, and a mixture of the liquid and dust is sucked into the housing through a dust collection hose by an air flow generated by a suction drive unit of a dust collection mechanism disposed in the upper housing, where the mixture is collected in a filter, filtered, and circulated for resupply. The dust collection and circulation device also includes a foam blocking mechanism disposed in the lower housing, the foam blocking mechanism having a lower concave blocking portion opening downward and an upper concave blocking portion supported above and spaced apart from the lower concave blocking portion, also opening upward. The lower concave blocking portion has a lower side wall disposed along the inner surface of the lower housing at a distance, and a top plate connected to the upper end of the lower side wall and covering a space enclosed by the lower side wall. Furthermore, the upper concave blocking portion has a bottom plate that is separated from the top plate and has an air opening that serves as a flow path for the air flow from the dust collection mechanism, and an upper side wall that is arranged around the periphery of the bottom plate so as to face the inner surface of the lower housing.

[0010] In the dust collection and circulation device according to the present invention, an air flow path is formed within the housing, which includes a lower housing and an upper housing, from between the lower side wall of the lower concave blocking portion of the foam blocking mechanism and the inner surface of the lower housing through the air opening in the bottom plate of the upper concave blocking portion of the foam blocking mechanism. When an air flow is formed within the housing by the suction drive unit of the dust collection mechanism, bubbles generated from the sludge filtration filter disposed in the lower housing attempt to move from within the lower housing toward the upper housing along with the air flow. As the moving bubbles rise along the inner surface of the lower housing, because the lower side wall of the foam blocking mechanism is separated from the inner surface of the lower housing, the bubbles burst upon contact with the lower side wall, or they pile up and burst under their own weight, preventing them from rising above the foam blocking mechanism even if they accumulate.

[0011] Furthermore, the dust collection and circulation system according to the present invention comprises a rotary tool having a rotary blade that cuts or grinds a workpiece and a dust collection cover that covers the processing position of the rotary blade, a liquid supply mechanism that supplies liquid from a water tank located within a housing to the rotary blade via a supply hose, a dust collection mechanism that has a suction drive unit located within the housing that sucks air from within the housing and cuts or grinds with the rotary tool from the processing position via the dust collection hose to collect a mixture of liquid and dust, and the dust collection and circulation device.

[0012] According to the dust collection and circulation system of the present invention, a mixture of dust particles and liquid, such as water, supplied from a liquid supply mechanism is collected into the housing by the suction drive unit of the dust collection mechanism through a dust collection hose. Furthermore, in the dust collection and circulation system, bubbles generated by a filter disposed within the housing are blocked by the bubble blocking mechanism in the air flow path that ascends from the lower housing to the upper housing. Note that the machining position, in the case of a grinder, is the position where the rotary blade contacts the workpiece. In the case of a bit drill, which forms a deep hole, the machining position is the surface of the workpiece where the hole is to be formed. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide a dust collection and circulation device and a dust collection and circulation system that prevent bubbles generated when passing through a filtration filter from reaching the suction drive unit of a dust collection mechanism such as a dust collection pump or ejector. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a configuration diagram illustrating a dust collection and circulation system according to the present invention; [Figure 2] 1 is a cross-sectional view illustrating a dust collection and circulation device according to the present invention. [Figure 3] 1 is a cross-sectional view illustrating an example of the configuration of a dust collection and circulation device according to the present invention in an isolated state. [Figure 4]1 is a cross-sectional view illustrating an example of the configuration of an upper housing of a dust collection and circulation device according to the present invention. [Figure 5] 3 is a cross-sectional view showing a suction drive unit (ejector) of the dust collection and circulation device according to the present invention. FIG. [Figure 6] 3 is a cross-sectional view illustrating the configuration of a lower housing of the dust collection and circulation device according to the present invention. FIG. [Figure 7] 1 is a perspective view illustrating a filter support portion that supports a filtration filter disposed in a lower housing of a dust collection and circulation device according to the present invention; [Figure 8A] 1 is a perspective view illustrating a foam blocking mechanism of a dust collection and circulation device according to the present invention; [Figure 8B] 1 is a schematic diagram showing a cross section of an upper concave blocking portion of a foam blocking mechanism of a dust collection and circulation device according to the present invention, illustrating the positional relationship with the lower housing. FIG. [Figure 8C] 1 is a perspective view illustrating a state in which a foam blocking mechanism of a dust collection and circulation device according to the present invention is viewed from below. FIG. [Figure 9A] 3 is a schematic cross-sectional view showing a state in which bubbles are generated from a filtration filter in the dust collection and circulation device according to the present invention; FIG. [Figure 9B] 1 is a schematic cross-sectional view showing a state in which bubbles generated from a filtration filter in a dust collection and circulation device according to the present invention rise up; FIG. [Figure 9C] This is a schematic diagram showing an enlarged cross section of the dust collection and circulation device of the present invention, omitting the filter, illustrating the state between the inner surface of the lower housing where bubbles rise and the lower side wall of the lower concave blocking portion. [Figure 10] FIG. 10 is a perspective view showing another configuration of the foam blocking mechanism according to the present invention. [Figure 11] 1 is a cross-sectional view schematically showing a state in which a foam blocking mechanism of a dust collection and circulation device according to the present invention is attached to an upper housing side. [Figure 12] FIG. 10 is a cross-sectional view showing another configuration of the foam blocking mechanism according to the present invention. [Figure 13] FIG. 10 is a side view schematically showing another configuration of the dust collection and circulation device according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, with reference to the drawings, an embodiment illustrating a dust collection and circulation system S100 and a dust collection and circulation device 100 according to the present invention will be described. Note that in each configuration of the dust collection and circulation system S100 and the dust collection and circulation device 100, the same elements are given the same reference numerals, and duplicated explanations will be omitted. Also, in each drawing, the size of some of the components may be exaggerated to make the relationship between the components easier to understand.

[0016] 1, the dust collection and circulation system S100 includes a dust collection and circulation device 100, a liquid supply mechanism 110, a dust collection mechanism 120, and a rotary tool 130. The rotary tool 130 performs grinding or cutting (hereinafter referred to as "processing") such as polishing, cutting, peeling off coatings, and drilling holes on hard structures such as concrete, stone, and ceramic-related products (hereinafter referred to as "workpiece W"), and the dust collection and circulation device 100 can collect sludge G, which is a mixture of dust and liquid (water) generated from the workpiece W. This system performs this while circulating water by supplying water to the processing position and collecting and filtering the sludge G from the processing site.

[0017] 1, the rotary tool 130 is, for example, a core bit drill or grinder that is electrically driven or driven by the flow of air from a compressor. Here, a grinder that rotates a rotary wheel 131 to grind off paint on the surface of a workpiece W will be described as an example of the rotary tool 130. The rotary tool 130 will be described as being configured to be driven by air from a compressor 121 as a drive source.

[0018] The rotary tool 130 includes a tool body 135, an output shaft 132 that rotates the rotary wheel 131 at the tip side of the tool body 135, a dust collection cover 133 that covers one side of the rotary wheel 131 attached to the output shaft 132, and an operation handle 134 that is attached to the tool body 135 on the side opposite to the output shaft 132. The rotary tool 130 also has an air connection part 136 from the compressor 121 at the rear of the tool body 135. The rotary tool 130 is configured to rotate the rotary wheel 131 when air is supplied to it. Furthermore, the rotary tool 130 has a liquid hose connection part 137 that connects the supply hose 113 of the liquid supply mechanism 110 and the bypass hose 114 to the tool body 135. When liquid (water) is supplied from the supply hose 113, the rotary tool 130 is configured to supply water to the machining site using the inside of the output shaft 132 as a flow path.

[0019] The dust-collection cover 133, for example, covers one side of the rotating wheel 131 to prevent dust from scattering during machining. It is attached to the tool body 135 with the output shaft 132 passing through it. The skirt portion that contacts the surface of the workpiece W is made of resin and has a certain degree of flexibility. It has notches formed in it to prevent leakage of the collected sludge G and to allow it to cover the machining area while moving. While the supply hose 113 is connected to the tool body 135 here, it may also be connected to the dust-collection cover 133. Water may be supplied to the machining area either as a mist from a spray nozzle or as a shower from a straight nozzle. A water channel may be provided in the center of the output shaft 132, allowing water to be supplied from the tip of the output shaft 132.

[0020] The rotating wheel 131 can be a known product that is generally used for processing work and has a cutting blade or grinding blade (hereinafter referred to as "cutting blade, etc.") attached to a foil base. This rotating wheel 131 has a processing section where the foil base performs processing, and a mounting section that supports the processing section and is attached to the tool body 135. The rotating wheel 131 is formed so that the center of the foil base protrudes to one side, and a through hole that is attached to the output shaft 132 is formed in the center of the protruding part. In addition, the rotating wheel 131 has cutting blades, etc., arranged at predetermined intervals in the circumferential direction on the circumferential surface of the lower surface of the foil base.

[0021] As an example, liquid supply mechanism 110 is disposed on the outer surface of lower housing 20, and supplies water from water storage tank 21 inside lower housing 20 to a processing position where cutting or grinding is performed by rotary tool 130. Liquid supply mechanism 110 includes: supply pump 111 disposed in case 110A connected to the outer surface of lower housing 20; a drive power supply 112 that drives supply pump 111; a liquid hose connection part 137 disposed on tool main body 135; a supply hose 113 having one end connected to supply pump 111 and the other end connected to liquid hose connection part 137 of rotary tool 130; a bypass hose 114 having one end connected to liquid hose connection part 137 and the other end connected to return water to water storage tank 21 of lower housing 20; and a switch knob 115 that switches the path between bypass hose 114 and supply hose 113.

[0022] The switch knob 115 is disposed at the liquid hose connection portion 137 and operates a switch valve. The switch knob 115 can be operated to switch between a path for sending the liquid (water) sent from the water storage tank to the processing position via the supply hose 113 and a path for returning the water sent from the water storage tank 21 via the supply hose 113 to the water storage tank 21 via the bypass hose 114. The switch knob 115 can be operated by the operator's fingers, and by operating it appropriately at the operator's work timing, it is possible to avoid wasteful use of the path that passes through the filtration filter 128.

[0023] The dust collection mechanism 120 collects the sludge G. The dust collection mechanism 120 includes a compressor 121 that also serves as a drive source for the rotary tool 130, a second connection hose 123B that connects via a branch to an air connection hose 122 connected to the compressor 121, an internal pipe 125 that is arranged in the upper housing 10 via a connection pipe 124 that is arranged in the upper housing 10, and an ejector 90 that is connected to the internal pipe 125. In this example, the dust collection mechanism 120 sends air from the compressor 121 to the ejector 90, which is a suction drive unit. The dust collection mechanism 120 uses the ejector 90 to suck air within the housing 1 from the lower housing 20 toward the upper housing 10, thereby forcibly forming an air flow within the housing 1, and collects the sludge G that is collected in the dust collection cover 133 via the dust collection hose 126 into the lower housing 20. The air sucked into the upper housing 10 is exhausted to the outside of the housing 1 from between the lower peripheral edge of the upper housing 10 and the upper peripheral edge 20A of the lower housing 20.

[0024] 5, the ejector 90 is formed in a cylindrical shape and creates an air flow that collects dust by sucking air inside the lower housing 20 toward the upper housing 10. The ejector 90 is attached to the mounting member 40 and disposed inside the upper housing 10. The ejector 90 includes a connection plate 91 connected to the mounting member 40 and having a flow path opening 92B formed therein, and a cylindrical main body 92 fixed to the connection plate 91. The cylindrical main body 92 has an air flow forming section 93 that is connected to the internal piping 125 and communicates with an air opening 92A that receives air and with which the flow path opening 92B is also communicated, and an air outlet cylindrical section 96 that sends out the air, the flow velocity of which has been accelerated by the air flow forming section 93, from an air outlet port 97 located above.

[0025] The air flow forming unit 93 includes an inner cylindrical portion 94 that communicates air from the flow path opening 92B to the inside and reduces the diameter of the air flow path from the air opening 92A, and an air acceleration unit 95 above the inner cylindrical portion 94 that accelerates the air from the air opening 92A and sends it toward the air outlet 97. The inner cylindrical portion 94 is arranged to form a space between the inner circumferential surface of the cylindrical main body 92 and the outer circumferential surface of the inner cylindrical portion 94. The air acceleration unit 95 is formed so that a portion of the inner circumferential surface of the cylindrical main body 92 approaches the outer circumferential surface of the upper part of the inner cylindrical portion 94, thereby making the air flow path smaller than the diameter of the internal piping 125. The air outlet 97 has an opening end 97a that is wider than the inner diameter of the cylindrical main body 92 and serves as a flow path for the air sent out from the air acceleration unit 95.

[0026] Therefore, when air from the compressor 121 is sent into the ejector 90 through the internal pipe 125, the ejector 90 receives the air in the space formed by the outer circumferential surface of the inner cylindrical portion 94 and the inner circumferential surface of the cylindrical main body 92. The ejector 90 then increases the flow velocity of the received air and sends it out from the air acceleration portion 95 toward the air outflow cylindrical portion 96. When the air is sent out, the gap in the air acceleration portion 95 is narrower than the diameter of the internal pipe 125, so the flow of the air is accelerated and sent out. Therefore, the increased air flow velocity reduces the air pressure and allows the air inside the lower housing to be sucked up.

[0027] The ejector 90 has an open end 97a of the air outlet 97 that is wider than the inner diameter of the cylindrical main body 92, so that the accelerated air flow rate is reduced and the air is sent into the upper housing 10. The sent air forms an air flow within the upper housing 10. The air sent from the ejector 90 into the upper housing 10 is sent along the ceiling 3 and the inner surface of the side peripheral surface 2 of the upper housing 10 to the lower housing 20, and is then sent out and exhausted from between the upper housing 10 and the lower housing 20 to the outside. Therefore, the dust collection hose 126 connected to the lower housing 20 sucks air from the machining site, and the air inside the dust collection cover 133 is sucked by the dust collection hose 126, thereby sending the sludge G to the filtration filter inside the lower housing 20. Note that a commercially available ejector 90 can be used. The ejector 90 may be supported by the intervening member 50, but in this case, it is supported by the mounting member 40, as will be described later.

[0028] [Dust collection and circulation device] 1 and 2, the dust collection and circulation device 100 has a lower housing 20 and an upper housing 10 arranged above the lower housing 20. The dust collection and circulation device 100 cuts or grinds the workpiece with a rotary tool 130 while supplying liquid (e.g., water) from a water storage tank 21 in the lower housing 20 to a processing site on the workpiece via a supply pump 111, and circulates a sludge (mixture) G of the liquid and dust by sucking it into the housing 1 through a dust collection hose 126 using an air flow generated by a suction drive unit (ejector) 90 of a dust collection mechanism 120 arranged in the upper housing 10, collecting it in a filtration filter 128, filtering it, and supplying it again. The dust collection and circulation device 100 also has a bubble blocking mechanism 30 arranged in the lower housing 20.

[0029] 2, 3, and 4, the upper housing 10 is formed into a dome shape by forming a side peripheral surface 2 and a ceiling 3 via a curved portion 4. The upper housing 10 has disposed therein an intervening member 50 connected to the ceiling 3 side via an auxiliary connecting portion 60, an attachment member 40 connected to the intervening member 50, an opposing plate 70 connected to the attachment member 40, and an ejector 90 attached to the attachment member 40. In addition, a lower end peripheral edge 10A of the upper housing 10 (the lower end of the side peripheral surface 2) is disposed apart from an upper end peripheral edge 20A of the lower housing 20.

[0030] Upper housing 10 has an installation section 5 at its top for attaching connection pipe 124 of first connection hose 123A that sends air from compressor 121, and multiple screw-fastening receiving sections 6 that protrude downward toward ceiling 3 and are used to attach auxiliary connection sections 60. Upper housing 10 has a curved section 4 at a position connecting ceiling 3 to side peripheral surface 2. Therefore, upper housing 10 can create an air flow such that when air from ejector 90 is sent toward ceiling 3, the air flows smoothly from the inner surface of ceiling 3, via curved section 4, along side peripheral surface 2, and is then sent out from between upper housing 10 and lower housing 20. Furthermore, screw-fastening receiving sections 6 can position auxiliary connection section 60 and are used to attach auxiliary connection section 60 to the ceiling 3 side of upper housing 10 with screws.

[0031] The auxiliary connection part 60 is used to adjust the connection position in the height direction of the intervening member 50 in the upper housing 10 and connect it. This auxiliary connection part 60 is used to increase the distance that air sent from the ejector 90 toward the ceiling 3 reaches the ceiling 3. The auxiliary connection part 60 includes a flat plate part 61 having an opening for arranging the ejector 90, a screw fastening part 62 that protrudes from the upper surface of the flat plate part 61 and is formed in a position facing the screw fastening part 6 of the upper housing 10, and a screw fastening part 63 that protrudes from the lower surface of the flat plate part 61 and is formed in a position facing the screw fastening part 52 of the intervening member 50. The auxiliary connection part 60 is attached to the upper housing 10 with a screw, with the screw fastening part 62 fitted into the screw fastening part 6 of the upper housing 10.

[0032] The intervening member 50 is attached to the upper housing 10 while supporting the mounting member 40 to which the ejector 90 is attached. The intervening member 50 includes an intervening plate 51 having an insertion hole formed therein through which the ejector 90 is inserted, and a peripheral inclined surface 54 that is disposed around the periphery of the intervening plate 51 and spaced apart from the lower peripheral edge 10A of the upper housing 10, the peripheral abutment portion 44 of the mounting member 40, and the upper peripheral edge 20A of the lower housing 20. The intervening plate 51 also includes an intervening support plate 55 spaced apart below it. The intervening support plate 55 has an opening formed in its center and is formed as a reinforcing member that reinforces the strength of the intervening plate 51 when the ejector 90 is inserted therethrough. The intervening member 50 includes a screw-retaining portion 52 that protrudes upward from the upper surface of the intervening plate 51, and a screw-receiving portion 53 that protrudes downward from the lower surface of the intervening support plate 55. Screw stop portion 52 is formed at a position facing screw stop receiving portion 63 of auxiliary connecting portion 60. Screw stop receiving portion 53 is formed at a position facing screw stop portion 42 of mounting member 40. Note that intervening member 50 is formed from resin here as an example, and intervening plate 51 and intervening support plate 55 are formed integrally and separated by a stepped portion so that the openings overlap.

[0033] The inclined peripheral surface 54 is disposed between the lower housing 20 and the upper housing 10 and guides the air discharged from the ejector 90 so that it is exhausted to the outside of the housing 1. The inclined peripheral surface 54 is disposed at a distance from the lower peripheral edge 10A of the upper housing 10 and is inclined downward from the intervening plate 51 at an angle of 30 to 60 degrees. Therefore, the air discharged from the ejector 90 flows from the inner surface of the ceiling 3 of the upper housing 10 along the inner surface of the side periphery, is guided by the inclined peripheral surface 54, and is easily discharged to the outside of the housing 1. The intervening member 50 is attached to the mounting member 40 by screws, with the screw-retaining portion 42 of the mounting member 40 fitted into the screw-retaining portion 53. Auxiliary walls 56 are formed below the inclined peripheral surface 54, extending intermittently or continuously in the circumferential direction. The auxiliary walls 56 support the inclined peripheral surface 54 to prevent it from vibrating due to the air blown against it. The intervening member 50 supports and attaches the mounting member 40 in a predetermined position with a screw, with the screw-fastening portion 42 of the mounting member 40 fitted into the screw-fastening receiving portion 53.

[0034] 2, 3, and 4, the mounting member 40 has an ejector support portion 41 that supports the ejector 90 and has an opening formed therein facing the flow path opening 92B of the ejector 90, and a peripheral abutment portion 44 that is provided on the peripheral edge of the ejector support portion 41 and abuts against the upper peripheral edge 20A of the lower housing 20. In addition, the mounting member 40 has an ejector support portion 41 that includes, for example, an ejector guide plate 41A and an ejector mounting support plate 41B that is disposed below the ejector guide plate 41A at a distance.

[0035] The ejector guide plate 41A has an opening through which the ejector 90 is inserted, and is provided with a screw fastening portion 42 that protrudes upward on its upper surface. The peripheral abutment portion 44 is disposed on the periphery of the ejector guide plate 41A. The peripheral abutment portion 44 directly abuts against the upper peripheral edge 20A of the lower housing 20, or abuts against the upper peripheral edge 39 of the upper recessed blocking portion 30B, which forms the upper peripheral edge of the bubble blocking mechanism 30 (described later).

[0036] The ejector mounting support plate 41B has an opening facing the flow path opening 92B of the ejector 90 from the ejector guide plate 41A, and also has a screw receiving portion 43 protruding downward on its underside. The ejector mounting support plate 41B has a through hole communicating with the screw receiving portion 42, and is attached to the screw receiving portion 53 of the interposition member 50 together with the ejector guide plate 41A with screws. The ejector mounting support plate 41B is formed so that a gap between it and the ejector guide plate 31A increases as it moves from the periphery toward the center. The ejector mounting support plate 41B is positioned such that the flow path opening 92B formed in the connection plate 91 of the ejector 90 faces the opening in the ejector mounting support plate 41B. The ejector 90 is inserted into the opening in the ejector guide plate 41A, and the ejector mounting support plate 41B is attached to the underside of the ejector guide plate 41A with screws. The mounting member 40 mounts the opposing plate 70 with screws to the screw receiving portions 43 arranged on the lower surface of the ejector mounting support plate 41B.

[0037] The opposing plate 70 forms part of the flow path of the ejector 90. The opposing plate 70 is disposed below the ejector mounting support plate 41B of the mounting member 40 at a distance. The opposing plate 70 has a screw-fastening portion 71 that protrudes upward on its upper surface. The opposing plate 70 is formed of, for example, metal, and is supported by the mounting member 40 so as to be located inside the upper recessed blocking portion 30B of the foam blocking mechanism 30. Here, the opposing plate 70 is disposed below the mounting member 40 at a distance along the upper side wall 36 of the foam blocking mechanism 30 and at a distance from the bottom plate 37 of the foam blocking mechanism 30. The opposing plate 70 is supported by the mounting member 40 in a state of contact with a mounting piece 37a formed on the upper surface of the bottom plate 37 of the foam blocking mechanism 30. When air is sucked in by the ejector 90, the opposing plate 70 forms an air flow path between itself and the bottom plate 37 of the foam blocking mechanism 30. The air flow path is formed within the lower housing 20 between the lower side wall 31 of the foam blocking mechanism 30 and the inner surface of the lower housing 20, between the top plate 32 and the bottom plate 37 of the foam blocking mechanism 30, and between the bottom plate 37 of the foam blocking mechanism 30 and the opposing plate 70, as flow paths leading to the ejector 90.

[0038] As shown in FIGS. 2, 3, and 6, the lower housing 20 is formed in the shape of a cylindrical body with a bottom and an open top. The lower inside of the lower housing 20 is a water storage tank 21, and a filter support part 80 is disposed above the water storage tank 21, supporting a filtration filter 128 that filters collected sludge G. The lower housing 20 also has a foam blocking mechanism 30 disposed above the filtration filter 128 supported by the filter support part 80. The lower housing 20 also has a connecting tube part 127 of a dust collection hose 126 disposed to penetrate the side wall surface. The lower housing 20 is covered with a mounting member 40, except for the air flow path of the foam blocking mechanism 30, to form an enclosed space inside. In other words, the interior of the lower housing 20 is configured to be covered with the mounting member 40 so that a pressure lower than the external atmospheric pressure (hereinafter sometimes referred to as "negative pressure") is maintained inside the lower housing 20, forming an enclosed space.

[0039] Dust collection hose 126 is detachably attached to one end of connecting tube portion 127 of dust collection hose 126, and filtration filter 128 is detachably connected to the other end of connecting tube portion 127. This connecting tube portion 127 protrudes cylindrically toward the inside of lower housing 20 to make it easy to connect filtration filter 128. As an example, connecting tube portion 127 is disposed at a position approximately one-third of the way from the top end of lower housing 20.

[0040] As shown in FIG. 7 , the filter support portion 80 supports the filtration filter 128 above the water storage tank 21. The filter support portion 80 is disposed so as to have no vertical gap with the foam blocking mechanism 30. The filter support portion 80 includes support legs 81 that abut the bottom surface of the lower housing 20 and a filter storage portion 82 supported by the support legs 81. The support legs 81 are formed so as to support a filter mounting surface 85, which is the bottom surface of the filter storage portion 82, at a predetermined height from the bottom surface of the lower housing 20. As an example, the support legs 81 are formed so that opposing arc-shaped portions of a storage side wall surface 83 continue downward from the filter mounting surface 85. The filter storage portion 82 includes the storage side wall surface 83 that is cylindrical and open at the top, and the filter mounting surface 85 disposed below. The filter mounting surface 85 and the storage side wall surface 83 have a plurality of through-holes formed therein, and are formed, for example, from a punched metal plate with through-holes formed in a metal plate. The storage side wall surface 83 has a recessed side surface 84 formed by recessing a position that will become the lower part of the connecting tube portion 127 inward from the tip of the connecting tube portion 127.

[0041] The storage side wall surface 83 is spaced apart from the inner surface of the lower housing 20 and is positioned so that there is no gap between it and the lower end of the lower concave blocking portion 30A, which is the lower end of the foam blocking mechanism 30. For example, the storage side wall surface 83 is formed so that its opening gradually widens upward from the filter mounting surface 85. A frame with a curved upper surface is attached to the upper end of the storage side wall surface 83, making it less likely to be damaged even if the filtration filter 128 comes into contact with it. The upper end of the filter storage section 82, i.e., the frame position at the upper end of the storage side wall surface 83, is positioned so that there is no gap between it and the lower end of the lower concave blocking portion 30A. Here, the lower end of the lower concave blocking portion 30A is positioned so that it fits inside the storage side wall surface 83. Below the filter mounting surface 85 is a space 86, where a water intake hose connected to the connecting tube portion 127 and a supply pump 111 connected to the water intake hose are disposed. The area below the lower surface of the filter mounting surface 85 and below the lower housing 20 serves as a water storage area. The filter support part 80 has a recessed side surface 84, so that when the filter support part 80 is placed in the lower housing 20 or removed from the lower housing 20, it can be smoothly inserted and removed without coming into contact with the connecting tube part 127. At the same time, the recessed side surface 84 is spaced apart from the connecting tube part 127, which prevents bubbles generated from the filtration filter 128 from creeping upward. Here, the recessed side surface 84 has an opening 87 on the upper side. The opening 87 is

[0042] A distance D2 is provided between the storage side wall surface 83 and the inner surface of the lower housing 20. Note that the distance D2 may vary in the circumferential direction. That is, because it is not necessary to align the center of the filter storage section 82 with the center of the lower housing 20, and because the storage side wall surface 83 is inclined from bottom to top and from inside to outside, the distance D2 is not constant. Therefore, it is preferable that the distance D2 be at least 1 cm. The length of the distance D2 is desirably 1 cm or more and 3 cm or less. Note that the shape of the filter support section 80 may be formed so that the distance D2 is a constant length.

[0043] As an example, the filter mounting surface 85 is formed by forming a plurality of through holes in a metal plate, similar to the storage side wall surface 83. The through holes formed in the metal plate are formed to the same size as the through holes in the storage side wall surface 83, but the through holes may be large, small, or a mixture of large and small sizes. It is preferable that the filter mounting surface 85 has enough strength to prevent deformation due to the weight of the sludge G that accumulates on the filtration filter 128. Note that the through holes may all have the same diameter, or may have a mixture of two or three different diameters.

[0044] As shown in FIG. 7 , the portion of the storage side wall surface 83 facing the concave side surface 84 is, for example, formed so that it changes from a circular arc to a flat surface. Having a portion of the storage side wall surface 83 as a flat surface facilitates the routing of a hose used for water supply, etc. The diameter of the storage side wall surface 83 may be adjusted to facilitate the routing of the hose. Furthermore, by forming an upper opening 87 cut out above the concave wall surface 84, a center pipe can be detachably connected to the connecting tube portion 127, and a filtration filter 128 can be attached to the center pipe. Attaching the center pipe to the connecting tube portion 127 facilitates the installation and removal of the filtration filter 128. The center pipe extends to approximately the center of the filter support portion 80.

[0045] The interior of lower housing 20 is set as water storage tank 21 between the lower ends of support legs 81 and filter mounting surface 85. The portion of lower housing 20 that corresponds to water storage tank 21 is preferably made of transparent or translucent resin so that the amount of stored water can be confirmed from the outside. Here, lower housing 20 is made of resin, as an example. The water intake section of the supply pump 111 is arranged in the water storage tank 21 via a water intake hose, and the water taken from the water storage tank 21 by the supply pump 111 is sent to the processing position via the supply hose 113.

[0046] A filter 128 is placed in the filter housing section 82 disposed above the water storage tank 21. There are no limitations on the material or shape of the filter 128 as long as it is capable of filtering and separating water from the sludge G, but in this embodiment, a known bag-shaped filter is used. The filter opening of the filter 128 is detachably attached to the connecting tube section 127 of the lower housing 20. The filter 128 is configured to filter water from the collected sludge G and drip it into the water storage tank 21. It should be noted that the filter 128 is preferably made of cloth, nonwoven fabric, or paper, for example.

[0047] 2, 3, and 8A to 8C, the foam blocking mechanism 30 blocks bubbles generated from the filtration filter 128 without allowing them to move from the lower housing 20 to the upper housing 10. The foam blocking mechanism 30 has a lower concave blocking portion 30A that opens downward, and an upper concave blocking portion 30B that is supported above and spaced apart from the lower concave blocking portion 30A, and also opens upward. As an example, the foam blocking mechanism 30 is supported by the lower housing 20 by an upper peripheral edge 39 of the upper concave blocking portion 30B abutting against the upper peripheral edge 20A of the lower housing 20.

[0048] The lower concave blocking portion 30A has a lower side wall 31 arranged at a distance along the inner surface of the lower housing 20, and a top plate 32 connected to the upper end of the lower side wall 31 and covering the space surrounded by the lower side wall 31. The lower concave blocking portion 30A is formed by the top plate 32 and the lower side wall 31 into a concave shape that opens downward. Lower sidewall 31 is disposed at a distance from the inner surface of lower housing 20. Distance D1 between lower sidewall 31 and the inner surface of lower housing 20 is preferably set in the range of 0.8 cm to 4.5 cm. If distance D1 is less than 0.8 cm, it may not be possible to efficiently prevent bubbles from climbing up. On the other hand, if distance D1 is greater than 4.5 cm, bubbles can be more efficiently prevented from climbing up, but the volume of filtration filter 128 becomes smaller. If distance D1 is 0.8 cm or more and 4.5 cm or less, even if bubbles try to climb up, they will burst when they come into contact with lower sidewall 31, and the bubbles' own weight can efficiently prevent them from climbing up. Distance D1 is more preferably 1 cm or more and 4 cm or less, and even more preferably 1.5 cm or more and 3.8 cm or less.

[0049] Furthermore, the height H1 from the bottom end to the top end of the lower side wall 31 is preferably 4 cm or more. If the height H1 of the lower side wall 31 is less than 4 cm, there is a possibility that bubbles will creep up from between the lower side wall 31 and the inner surface of the lower housing 20. Therefore, the height of the lower side wall 31 is set to 4 cm or more, preferably 6 cm or more, and more preferably 8 cm or more. It is preferable to eliminate any gap between the bottom end of the lower side wall 31 and the upper end of the filter storage section 82. Since there is no gap between the bottom end of the lower side wall 31 and the upper end of the filter storage section 82, bubbles tend to accumulate within the lower side wall 31 or the filter storage section 82. Therefore, generated bubbles move only through the through-holes in the filter support section 80 toward the inner surface of the lower housing 20, making it difficult for bubbles to accumulate.

[0050] Furthermore, the lower sidewall 31 has a wall opening 33 that opens at a position facing the connecting tube portion 127 of the dust collection hose 126 without forming a sidewall. Therefore, the connecting tube portion 127 faces the inner wall surface of the lower sidewall 31. The inner wall surface of the lower sidewall 31 that faces the connecting tube portion 127 may be made to protrude inward more than the other inner wall surfaces to increase the thickness of the wall surface. In FIG. 8C , the wall opening 33 has a rectangular opening shape. Note that a narrower opening area of ​​the wall opening 33 can suppress the upward movement of bubbles generated from the filtration filter 128, so it is preferable that the opening width be such that the connecting tube portion 127 can fit in just right.

[0051] Top plate 32 is arranged to cover the space surrounded by lower side wall 31. Top plate 32 has screw receiving portions 38 formed on its upper surface that protrude upward. Screw receiving portions 38 are portions that are screwed when screw receiving portions 35 that protrude downward are fitted into the underside of bottom plate 37 of upper recessed blocking portion 30B. A plurality of screw receiving portions 38 are formed, and as an example, in the drawing, they are arranged at three locations on top plate 32, each at an angle of 120 degrees. When the dust collection mechanism 120 sucks in air, the space between the lower side wall 31 and the inner surface of the lower housing 20 and the space between the top plate 32 and the bottom plate 37 form air flow paths that connect to the air opening 37b of the bottom plate 37.

[0052] The upper concave blocking portion 30B forms an air flow path and covers the space of the lower housing 20. The upper concave blocking portion 30B includes a bottom plate 37, an upper side wall 36 arranged on the periphery of the bottom plate 37, and an upper edge peripheral portion 39 arranged on the periphery of the upper end of the upper side wall 36. The upper concave blocking portion 30B is formed by the bottom plate 37 and the upper side wall 36 into a concave shape that opens upward. The bottom plate 37 has a screw fastening portion 35 disposed on its lower surface, protruding downward, and a mounting piece 37a of the opposing plate 70 disposed on its upper surface, protruding upward.

[0053] The bottom plate 37 has an air opening 37b at its center, which serves as an air flow path. The bottom plate 37 has a larger area than the top plate 32 of the downward recessed blocking portion 30A. The bottom plate 37 and the top plate 32 are spaced apart by a predetermined distance D3 (see FIG. 8B). The distance D3 is set to be, for example, 1 to 4 cm. The upper sidewall 36 is disposed at the periphery of the bottom plate 37 so as to face the inner surface of the lower housing 20. The upper sidewall 36 is set to be equal to or higher in height than the lower sidewall 31. The support piece 37a has a support portion whose upper end is recessed inwardly into a rectangular shape in side view, and abuts against the periphery of the opposing plate 70 to support the opposing plate 70. For example, multiple support pieces 37a (six in the drawing) are disposed in the circumferential direction.

[0054] As an example, the upper side wall 36 is arranged so as to face the inner surface of the lower housing 20 by abutting or being close to it. An upper peripheral edge 39 of the upper side wall 36 is formed so as to protrude outward from the upper end of the upper side wall 36. The upper peripheral edge 39 is arranged so as to abut against the upper peripheral edge 20A of the lower housing 20. With the upper peripheral edge 39 supported by the upper peripheral edge 20A of the lower housing 20, the bubble blocking mechanism 30 is arranged in the lower housing 20 so as to cover the opening of the lower housing 20.

[0055] As shown in FIGS. 9A, 9B, and 9C, bubble blocking mechanism 30 blocks bubbles generated from filtration filter 128 so as not to move toward upper housing 10 in the following manner. When air is sent from compressor 121 (see FIG. 1), dust collection mechanism 120 sucks air from inside lower housing 20 toward upper housing 10 via ejector 90, creating a negative pressure inside upper housing 10. When negative pressure is created inside upper housing 10, air flows from lower housing 20 to upper housing 10, and sludge G can be collected and recovered through dust collection hose 126 into filter 128 of lower housing 20. The sucked air flows from dust collection hose 126 toward filter 128. In addition, the air that has passed through filter 128 is blown against inner wall surface 34 of lower side wall 31 of lower recessed blocking section 30A.

[0056] In other words, air flows through the following channels: between the inner surface of the lower housing and lower sidewall 31 of lower recessed blocking portion 30A; between top plate 32 and bottom plate 37; between air opening 37b of bottom plate 37 and the upper surface of bottom plate 37 and the lower surface of opposing plate 70; and from the upper surface of opposing plate 70 toward channel opening 92B of ejector 90. When air flows, bubbles are generated from filtration filter 128. The generated bubbles increase in volume, piling up from filtration filter 128, and continue to grow above filtration filter 128 and through the through-holes in storage-side wall surface 83 of filter support portion 80.

[0057] The increased bubbles then attempt to creep upward along the inner surface of lower housing 20 and lower sidewall 31 of lower concave blocking portion 30A. At this time, the inner surface of lower housing 20 and lower sidewall 31 of lower concave blocking portion 30A are separated, creating a gap D1. This makes it difficult for the bubbles to burst at the position of gap D1, or for the bubbles to creep further upward due to their own weight along with the splashes of the burst bubbles. Therefore, bubbles generated by the air flow from filtration filter 128 cannot pass through bubble blocking mechanism 30 and remain within lower housing 20.

[0058] Next, the overall operation of the dust collection and circulation system S100 will be described below with reference to FIGS. 1, 9A to 9C, etc. The dust collection and circulation system S100 can basically be used in places where there are no power outlets. First, in the dust collection and circulation system S100, the compressor 121 of the dust collection mechanism 120 is started and the switch of the liquid supply mechanism 110 is turned on. In the dust collection and circulation system S100, the liquid supply mechanism 110 circulates water between the rotary tool and the water storage tank 21 arranged in the lower housing 20 of the dust collection and circulation system 100 via the bypass hose 114 and the supply hose 113, using the switch knob 115 arranged on the rotary tool 130 side.

[0059] While holding the operating handle 134 of the rotary tool 130, the operator operates the switch knob 115 to supply water to the processing position while the cutting blade of the rotary tool 130 is in contact with the coating on the wall surface of the workpiece W. Then, the operator turns on the switch of the rotary tool 130, causing the rotary tool 130 to start processing the workpiece W using air from the compressor 121. When the switch of the rotary tool 130 is turned on, compressed air is supplied via the first connection hose 123A from the branch connected to the compressor 121, causing the rotating wheel 131 to rotate at high speed and starting the cutting operation. When the cutting operation starts, sludge G, which is a mixture of water supplied to the processing site and dust produced by cutting, is collected by the dust collection mechanism 120 from the dust collection cover 133 through the dust collection hose 126 into the filter 128 attached to the lower housing 20 of the dust collection and circulation device 100.

[0060] Sludge G is collected in filter 128 by the air flow formed by dust collection mechanism 120. In dust collection mechanism 120, compressor 121 is connected to second connection hose 123B, which is connected to a branching portion, via connection pipe 124 arranged in upper housing 10 of dust collection and circulation device 100, and air is sent into housing 1. When air is sent from internal piping 125 to ejector 90 in dust collection mechanism 120, the flow rate of the air is accelerated by ejector 90 and the air is sent toward the inner top surface of upper housing 10. Therefore, air is sucked up from lower housing 20 toward upper housing 10, forming an air flow from lower housing 20 to upper housing 10, and sludge G that accumulates in dust collection cover 133 is collected in filter 128 via dust collection hose 126.

[0061] When sludge G is collected, the air flow inside the housing 1 is sent from the lower housing 20 to the upper housing 10 by the ejector 90 via the bubble blocking mechanism 30, and is exhausted to the outside of the housing 1 through the peripheral inclined surface 54 of the intervening member 50 arranged between the upper housing 10 and the lower housing 20. Meanwhile, as shown in FIG. 9A , an air flow path is formed within housing 1, causing bubbles to be generated from sludge G in filter 128. The generated bubbles pass through the through-holes above filter 128 and in storage-side wall surface 83 of filter support portion 80, piling up and increasing within lower housing 20. The bubbles that increase and creep upward then attempt to creep further upward through the gap between lower sidewall 31 of lower concave blocking portion 30A of foam blocking mechanism 30 and the inner wall surface of lower housing 20. However, because lower sidewall 31 is separated by distance D1, the bubbles burst within distance D1 and are unable to creep up due to their own weight. Furthermore, since there is no gap between the lower end of lower sidewall 31 and the upper end of storage-side wall surface 83, bubbles tend to remain within filter storage portion 82. Therefore, the bubbles are prevented from creeping up along the air flow path at the position of lower concave blocking portion 30A of foam blocking mechanism 30. The air flow path is sent from the lower housing 20 to the upper housing 10 and is formed without being obstructed.

[0062] As described above, in the dust collection and circulation system S100 and the dust collection and circulation device 100, even if foam is generated when collecting sludge G, the foam blocking mechanism 30 can prevent the foam from climbing up toward the upper housing 10. Therefore, in the dust collection and circulation system S100 and the dust collection and circulation device 100, the generated foam is not sent out of the housing 1. Furthermore, in the dust collection and circulation system S100 and the dust collection and circulation device 100, the generated foam does not reach the ejector, which is the suction drive unit, so the suction drive unit is not affected by the foam. Furthermore, according to the dust collection and circulation system S100, by combining the dust collection and circulation device 100 that achieves the above-mentioned effects with the rotary tool 130, it can be used as a system for performing work such as polishing, cutting, and coating removal of hard structures by wet circulating while collecting dust.

[0063] Furthermore, in the dust collection and circulation system S100, the rotary tool 130 and the dust collection and circulation device 100 spray water onto the dust to produce sludge G, which is then recovered and the water filtered from the sludge G can be reused. Therefore, in the dust collection and circulation system S100, the size of the water storage tank 21 can be reduced, thereby realizing miniaturization. Although an example of a preferred embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and appropriate design changes can be made to each element within the scope of the present invention. For example, the present invention may be modified as follows.

[0064] 10, in the bubble blocking mechanism 30, it is preferable that the wall opening 33A of the lower side wall 31 is shaped to cover at least half of the connecting tube portion 127. Here, the wall opening 33A is formed to have a semicircular opening shape that covers half of the shape of the connecting tube portion 127. By making the wall opening 33A semicircular, the distance D1 between the inner surface of the lower housing 20 can be maintained over a wider range, which makes it possible to further suppress bubbles from creeping up.

[0065] Furthermore, although the foam blocking mechanism 30 has been described as being supported by abutting against the upper peripheral edge 20A of the lower housing 20, as shown in FIG. 11 , a screw-receiving portion 49 may be formed on the lower surface of the mounting member 40, and a screw-receiving portion 39B may be formed on the bottom plate 37 of the foam blocking mechanism 30. The foam blocking mechanism 30 may then be attached by a screw N1 with the screw-receiving portion 39B of the bottom plate 37 of the foam blocking mechanism 30 fitted into the screw-receiving portion 49 of the mounting member 40. Note that when the bubble blocking mechanism 30 is supported on the upper housing 10 side, the upper peripheral edge 39 may not be provided, and the peripheral edge abutting portion 44 of the mounting member 40 may be configured to directly abut against the upper peripheral edge 20A of the lower housing 20. Of course, the upper peripheral edge 39 may abut against the upper peripheral edge 20A of the lower housing 20, and the peripheral abutting portion 44 of the mounting member 40 may abut against the upper peripheral edge 39.

[0066] Furthermore, while the dust collection and circulation system S100 has been described as a rotary tool 130 using a rotating wheel 131, a rotary tool that drills holes in a workpiece W, such as a bit drill, may also be used. With a bit drill, the surface of the workpiece W at the drilling position is covered as the processing area to collect sludge G. Water is supplied from the center of the shaft of the bit drill to the processing area where the bit drill is drilling. The concrete powder cut by the cutting edge of the bit drill is mixed with the water and flows out of the drilled hole as sludge G, and is sent into the dust collection cover. The dust collection mechanism then collects the sludge G in the dust collection cover via the dust collection hose 126 into a filter 128 located in the lower housing 20.

[0067] Furthermore, a suction pump may be used as the suction drive unit instead of an ejector. Any known pump (e.g., a vacuum pump) can be used as the suction pump as long as it can collect sludge G generated inside the dust collection cover 133 together with air via the dust collection hose 126 by creating a negative pressure inside the lower housing 20 including the water storage tank. Even when a suction pump is used in the dust collection and circulation system S100 and the dust collection and circulation device 100, bubbles generated by the bubble blocking mechanism 30 cannot creep up to the upper housing side, thereby preventing damage to the suction drive unit. The supply pump 111 is provided to supply water stored in the water storage tank 21 to the injection nozzle, and a known pump (for example, a gear pump) can be used.

[0068] As shown in FIG. 12 , the foam blocking mechanism 30 may include an air filter FT positioned between the lower recessed blocking portion 30A and the upper recessed blocking portion 30B to cover the air opening 37b. A wire mesh demister filter is used as an example of the air filter FT. This air filter FT is made of filamentary material, such as resin wire, arranged in a mesh shape with spaces between them. The air filter FT has an extremely high void ratio of 94% to 99% and a very large surface area, as the entire surface of the filamentary material is in contact with the space. This allows air to pass through the air while blocking bubbles. The filamentary material used in the wire mesh is not particularly limited, but may be resin wire, metal wire, or other materials. The air filter FT may also be made of rolled resin wire or metal wire, or multiple stacked mesh plates with varying mesh positions. The air filter FT is not limited as long as it allows air to pass through but does not allow bubbles to pass through. The air filter FT needs to cover the entire surface where the bottom plate 37 and the top plate 32 face each other, and at least be in a position that blocks the air opening 37b. With the air filter FT, even if bubbles creep up, they burst when they come into contact with the air filter FT, so the flow of air is not impeded and the bubbles can be reliably prevented from creeping up.

[0069] 13, the lower periphery of the upper housing 10 may be configured to abut against the upper periphery of the lower housing 20, in which case an exhaust port formed in the upper housing 10 for exhausting the air flow generated by the suction drive unit to the outside of the housing 1 is formed directly above the outer periphery of the lower end of the upper housing 10. The exhaust ports 9 for exhausting air are formed intermittently in the circumferential direction on the lower end side of the upper housing 10. Furthermore, the lower housing 20 may have casters 25 for movement whether it is configured as shown in FIG. 12 or FIG. 2.

[0070] As described above, there are no limitations on the configuration of the rotary tool and the dust collection and circulation device, and optimal components can be adopted. Furthermore, the rotary tool and the dust collection and circulation device are exemplified by the minimum necessary components, and other necessary components may be added as long as they do not impair the effects of the present invention. [Explanation of symbols]

[0071] 1 chassis 2 Side surface 3. Ceiling 4 Curved section 5 Connection 6 Screw-receiving part 10 Upper housing 10A Lower edge 20 Lower housing 20A Upper edge 21 Water Tank 30 Foam blocking mechanism 30A Lower concave cutoff section 30B Upper concave blocking part 31 Lower side wall 32 Top plate 33 Wall opening 34 Inner wall surface 35 Screw fastening part 36 Upper side wall 37 Bottom plate 37a Placement piece 37b Air opening 38 Screw-receiving part 39 Upper edge 40 Mounting material 41 Ejector support 41A Ejector guide plate 41B Ejector mounting support plate 42 Screw fastening part 43 Screw-receiving part 44 Peripheral abutment 49 Screw-receiving part 50 Intervening member 51 Intervening plate 52 Screw fastening part 53 Screw-receiving part 54 Peripheral slope 55 Interposed support plate 60 Auxiliary Connection 61 Flat plate part 62 Screw fastening part 63 Screw-receiving part 70 Opposing plate 71 Screw fastening part 80 Filter support part 81 Support leg 82 Filter storage section 83 Storage side wall 84 Concave side 85 Filter mounting surface 90 Ejector 91 Connection plate 92 Cylindrical body 92A Air opening 92B Flow path opening 93 Air flow forming section 94 Inner cylinder 95 Air Acceleration Section 96 Air outlet tube 97 Air outlet 97a Open end 100 Dust collection and circulation equipment 110 Liquid supply mechanism 110A Case 111 Supply pump 112 Drive power supply 113 Supply Hose 114 Bypass hose 115 Switching knob 120 Dust collection mechanism 121 Compressor 122 Air connection hose 123A 1st connecting hose 123B Second connecting hose 124 Connecting pipe 125 Internal Piping 126 Dust collection hose 127 Connecting tube 128 Filtration Filter 130 Rotary Tools 131 Rotating Wheel 132 output shaft 133 Dust collection cover 134 Operating handle 135 Tool body 136 Air connection 137 Fluid hose connection 140 Filtration Filter D1 interval FT Filter G Sludge M water N1 screw S100 Dust Collection and Circulation System W Workpiece

Claims

1. A dust collection and circulation device having a lower housing and an upper housing arranged above the lower housing, in which liquid in a water storage tank in the lower housing is supplied to a processing portion of a workpiece via a supply pump while cutting or grinding is performed with a rotary tool, and a mixture of the liquid and dust is sucked into the housing through a dust collection hose by an air flow caused by a suction drive unit of a dust collection mechanism arranged in the upper housing, recovered in a filter, filtered, and circulated to be supplied again, a bubble blocking mechanism disposed in the lower housing; The bubble blocking mechanism has a lower concave blocking portion that opens downward, and an upper concave blocking portion that is spaced apart from the lower concave blocking portion and supported upward, and that opens upward, the lower recessed blocking portion has a lower sidewall spaced apart from the inner surface of the lower housing, and a top plate connected to an upper end of the lower sidewall and covering a space surrounded by the lower sidewall, The upper concave blocking portion is a dust collection and circulation device having a bottom plate separated from the top plate and having an air opening formed therein which serves as a flow path for air flow by the dust collection mechanism, and an upper side wall arranged around the periphery of the bottom plate so as to face the inner surface of the lower housing.

2. The dust collection and circulation device described in claim 1, wherein the upper housing has a mounting member for mounting the ejector, which is the suction drive unit, above the foam blocking mechanism, and the mounting member has an ejector support portion that supports the ejector and has an opening facing the flow path opening of the ejector, and a peripheral abutment portion that abuts the upper peripheral edge of the lower housing on the periphery of the ejector support portion.

3. 3. The dust collection and circulation device of claim 2, wherein the mounting member supports an opposing plate below the mounting member, the opposing plate being positioned below the mounting member, spaced apart along the upper side wall of the foam blocking mechanism, and spaced apart from the bottom plate of the foam blocking mechanism.

4. 3. The dust collection and circulation device of claim 2, wherein the mounting member is attached via an intervening member supported by the upper housing, the intervening member comprising an intervening plate having an insertion hole through which the ejector is inserted, and a peripheral inclined surface disposed at the periphery of the intervening plate and spaced apart from the lower periphery of the upper housing and the peripheral abutment portion of the mounting member, the peripheral inclined surface inclining from the upper housing toward the lower housing.

5. The dust collection and circulation device according to claim 2 , wherein the foam blocking mechanism is supported by the mounting member and disposed in the lower housing at a distance below the mounting member.

6. 2. The dust collection and circulation device according to claim 1, further comprising at least one of an exhaust port disposed between the upper periphery of the lower housing and the lower periphery of the upper housing, for exhausting the air flow generated by the suction drive unit to the outside of the housing, or an exhaust port formed in the upper housing for exhausting the air flow generated by the suction drive unit to the outside of the housing.

7. a connecting tube portion, one end of which is connected to the dust collection hose and the other end of which is connected to the filtration filter that stores the mixture, provided on the lower housing; The dust collection and circulation device according to claim 1 , wherein the lower side wall of the foam blocking mechanism is shaped to cover at least half of the connecting tube portion along the connecting tube portion at a position facing the connecting tube portion.

8. a filter support portion for supporting the filtration filter disposed above the water storage tank of the lower housing, the filter support portion including a filter storage portion disposed apart from an inner surface of the lower housing, and support legs abutting against a bottom surface of the lower housing; 8. The dust collection and circulation device according to claim 7, wherein the filter storage section has a storage side wall surface, a concave side surface formed by recessing the storage side wall surface, which forms the lower part of the connecting tube portion of the dust collection hose, inward from the tip of the connecting tube portion, and a filter mounting surface, which is surrounded by the storage side wall surface and the concave side surface and on which the filtration filter is mounted, and the filter mounting surface is a mesh or a metal plate with through holes.

9. 9. The dust collection and circulation device according to claim 8, wherein the filter support portion and the foam blocking mechanism are arranged so that there is no gap between the upper end of the filter housing portion and the lower end of the lower recessed blocking portion.

10. a rotary tool including a rotary blade for cutting or grinding a workpiece and a dust collection cover for covering a processing position of the rotary blade; a liquid supply mechanism that supplies liquid from a water storage tank disposed within the housing to the rotary blade through a supply hose; a dust collection mechanism including a suction drive unit disposed in the housing, which sucks air from inside the housing and collects a mixture of liquid and dust by cutting or grinding with the rotary tool from the processing position through a dust collection hose; A dust collection and circulation system comprising: the dust collection and circulation device according to any one of claims 1 to 9.

11. 11. The dust collection and circulation system according to claim 10, wherein the liquid supply mechanism includes a bypass hose that connects the water storage tank and the rotary tool, and a switching knob that operates a switching valve that switches a liquid flow path between the supply hose that supplies liquid to the rotary tool and the bypass hose is disposed on the rotary tool.

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