JP2020157427A - Rotary tool and wet dust collection circulation system - Google Patents

Abstract

To provide a rotary tool and a wet dust collection circulation system, in which a work can be performed while circulating water by collecting dust by wet type even if the rotary tool performs the work while moving a rotary foil.SOLUTION: A rotary tool 10 includes: an output shaft 2 on which a rotary wheel for cutting or grinding a workpiece W is mounted so as to be rotationally driven; and a dust collection cover 3 which covers one surface side of the rotary wheel mounted on the output shaft. The dust collection cover has a top face section 4 through which the output shaft passes, a peripheral side face section 5 continuous to the top face section 4, an annular moving side face section 6 which is movably provided in a direction orthogonal to a circumferential direction of the peripheral side face section, and an abutting section 6e which is provided along the circumferential direction at a lower end of the moving side face section and abuts on a top face of the workpiece. A spray nozzle 7 and a connection hole 8 of a dust collection hose are provided to be separated from each other so as to pass through a cover inner wall surface from a cover outer wall surface in the top face section or the peripheral side face section.SELECTED DRAWING: Figure 1

Description

The present invention uses a cup-type rotary tool such as a grinder to perform operations such as polishing, cutting, and peeling of a coating film of a hard structure such as stone or concrete by circulating in a wet manner while collecting dust. Regarding tools and wet dust collection and circulation systems.

Conventionally, the rotary tool is fixed at the working position, the dust collecting hose and the supply hose are attached to the cover, the lubricating water is supplied from the supply hose, and the sludge mixed with the lubricating water and the dust is collected and filtered by the dust collecting hose. The work such as drilling is performed while circulating the lubricating water again (see Patent Document 1).
On the other hand, in the work of removing the paint, a rotating tool such as a grinder equipped with a rotating foil in which a grindstone is installed on a processed surface is used. It is known that in this rotary tool, in order to prevent dust from being scattered around, a dust collector is connected to the cover of the rotary tool to perform grinding work or cutting work while collecting dust (see Patent Document 2). ).

Japanese Unexamined Patent Publication No. 2013-67023 Japanese Unexamined Patent Publication No. 2013-63495

However, the conventional rotary tool using a rotary wheel collects dust while moving and performing the work, but since it is a dry work, there is a limit in suppressing the floating of dust generated during the work.
In addition, with a rotary tool that circulates lubricating water to make a small hole such as a drill, the work is performed in a fixed state, and when working while moving a large-diameter rotating foil with a diameter exceeding 9 cm. Is difficult to apply as is.
Furthermore, if the amount of water used during work is large, the storage tank will also be large.

Therefore, the present invention provides a rotary tool and a wet dust collection and circulation system that can collect dust in a wet manner and circulate with a small amount of water even if the rotary tool works while moving a large rotary foil. Make it an issue.

In order to solve the above problems, the rotary tool according to the present invention has an output shaft to which a rotary wheel for cutting or grinding a workpiece is attached and rotationally driven, and one side of the rotary wheel attached to the output shaft is provided. In a rotary tool having a dust collecting cover to cover, the dust collecting cover moves in a direction perpendicular to the circumferential direction of the upper surface portion through which the output shaft penetrates, the peripheral side surface portion continuous with the upper surface portion, and the peripheral side surface portion. A freely provided annular moving side surface portion and a contact portion provided along the circumferential direction at the lower end of the moving side surface portion and in contact with the upper surface of the work piece are provided, and the upper surface portion or the peripheral surface portion is provided. The side surface portion is configured such that the connection holes for the spray nozzle and the dust collecting hose are provided apart from each other so as to penetrate from the outer wall surface of the cover to the inner wall surface of the cover.

According to the above configuration, the rotary tool is a sludge in which water is sprayed from the spray nozzle into the dust collection cover to the dust generated by cutting or grinding with the rotary foil, and the dust is not suspended by the sprayed water. It will be ready for recovery. In addition, with a rotary tool, when working while moving, the amount of sludge for collecting dust in the dust collection cover is small, so even if water is used, it is sprayed inside the dust collection cover. It becomes easy to collect dust. Therefore, even if the rotary tool moves during cutting or grinding work, it is possible to minimize the leakage of water sprayed to the outside from between the contact portion of the dust collecting cover and the workpiece. it can.

Further, in order to solve the above-mentioned problems, the wet dust collection and circulation system according to the present invention has an output shaft to which a rotary foil for cutting or grinding a work piece is attached and rotationally driven, and a rotation attached to the output shaft. A rotating tool having a dust collecting cover that covers one side of the foil, and a dust collecting and circulating device that supplies and collects water to be sprayed on the dust generated by cutting or grinding the work piece with the rotating foil of the rotating tool. A wet dust collection and circulation system comprising the above, wherein the dust collection cover of the rotary tool has an upper surface portion through which the output shaft penetrates, a peripheral side surface portion continuous with the upper surface portion, and a circumferential direction of the peripheral side surface portion. It is provided with an annular moving side surface portion provided so as to be movable in a direction orthogonal to the above, and an abutting portion provided along the circumferential direction at the lower end of the moving side surface portion and in contact with the upper surface of the workpiece. A spray nozzle and a connection hole for a dust collection hose are provided on the upper surface portion or the peripheral side surface portion of the dust collection cover so as to penetrate from the outer wall surface of the cover to the inner wall surface of the cover so as to be separated from each other. Is a supply tank that supplies water to the spray nozzle via a supply hose, a dust collection pump that collects sludge mixed with water and dust via the dust collection hose, and sludge collected by the dust collection pump. A filter that separates water from the sludge and a supply pump that supplies the water separated by the filter from the supply tank to the spray nozzle via the supply hose are provided.

According to the above configuration, in the wet dust collection and circulation system, water is supplied from the supply tank of the dust collection and circulation device to the spray nozzle by the supply pump via the supply hose, and the dust is collected by the dust collection pump through the dust collection hose. The sludge, which is a mixture of the sprayed water in the cover and the dust generated by grinding or cutting, is collected in the filter. Then, in the wet dust collection and circulation system, the collected sludge is separated by a filter, and the separated water is returned to the supply tank. Further, in the wet dust collection and circulation system, when a rotary tool moves on a work piece and grinds or cuts with a rotary foil, water is sprayed from a spray nozzle into the dust collection cover to suppress dust. The amount of water supplied with the dust collecting cover can be reduced, and the amount of water leaked to the outside of the dust collecting cover can be minimized.

Since the rotary tool according to the present invention is formed so as to spray water from a spray nozzle, the work of suppressing dust and cutting or grinding can be performed while moving. In addition, since the rotary tool sprays water on the dust, the amount of water supplied can be small, and the sprayed water during work can be minimized from leaking to the outside from the dust collection cover. it can.
Further, in the wet dust collection and circulation system according to the present invention, water is sprayed from a spray nozzle of a rotary tool to suppress dust, sludge is collected through a dust collection hose, filtered by a filter, and water is circulated. Can be used. Therefore, in the wet dust collection and circulation system, it is possible to work with a rotary tool even with a small amount of water, and the dust collection and circulation device can be made smaller to improve workability.

It is a perspective view which shows typically the dust collection circulation apparatus of the wet dust collection circulation system which concerns on this invention, and the rotary tool which cut out a part. It is a schematic diagram which shows typically the structure of the dust collection circulation device of the wet dust collection circulation system which concerns on this invention, and the structure of a rotary tool in the cross section. It is a top view which shows the dust collection cover by omitting a part of the rotary tool which concerns on this invention. A cross-sectional view schematically showing a state in which the annular side surface of the moving side surface portion is located at the lower end of the moving surface by the urging portion while schematically showing the structure inside the dust collecting cover from the front side of the rotary tool according to the present invention. Is. The rotary tool according to the present invention is schematically shown with a cross section of the structure inside the dust collecting cover from the front side, and a state in which the annular side surface of the moving side surface portion is located at the upper end of the moving portion against the urging force of the urging portion. It is sectional drawing which shows typically. It is a perspective view which shows typically the state which grinds the workpiece by the rotary tool which concerns on this invention. It is a top view which shows typically the other structure of the spray nozzle by omitting a part of the rotary tool which concerns on this invention.

An embodiment which is an example of the wet dust collection and circulation system and the rotary tool according to the present invention will be described below with reference to the drawings. In addition, in each figure, the size interval and the like of each part may be exaggerated as appropriate for easy understanding. In addition, the directions such as up, down, left, right, front and back are relative ones described for the sake of easy understanding, and do not indicate a fixed direction.

As shown in FIG. 1, the wet dust collection and circulation system 100 includes a rotary tool 10 and a dust collection and circulation device 50. The wet dust collection and circulation system 100 uses a rotary tool 10 to grind or cut hard structures (hereinafter referred to as workpieces) W such as concrete, stone materials, and ceramic-related products, such as polishing, cutting, and peeling of a coating film. Hereinafter referred to as processing) is performed while circulating water by supplying and collecting dust from the dust collecting and circulating device 50.

First, the rotary tool 10 will be described.
As shown in FIGS. 1 and 2, the rotary tool 10 is, for example, an electric and handy type grinder, and a disk-shaped rotary foil RH whose center protrudes to one side is detachably attached to perform grinding or cutting work. Is to do. The rotary tool 10 includes a tool body 1, an output shaft 2 provided on the tool body 1 for rotationally driving the rotary wheel RH, a dust collecting cover 3 provided on the tool body 1 to cover one surface side of the rotary wheel RH attached to the output shaft 2. The dust collection cover 3 is provided with a spray nozzle 7 and a connection hole 8 for a dust collection hose Sh.

The dust collecting cover 3 covers one surface side of the rotating foil RH to prevent dust from scattering during processing, and is installed on the tool body with the output shaft 2 penetrating the upper surface portion 4 and the upper surface portion 4. It includes a peripheral side surface portion 5 formed downward from the peripheral end side, and a moving side surface portion 6 provided so as to move up and down along the peripheral side surface portion 5. The dust collection cover 3 is installed so as to penetrate the output shaft 2 so as to be the center of the disk-shaped upper surface portion 4, and the outer peripheral edge of the rotating wheel RH is close to the front end of the dust collection cover 3. It may be installed so as to penetrate the output shaft 2 at a position eccentric to.

As shown in FIG. 3, the upper surface portion 4 is formed so that the output shaft 2 of the tool body 1 penetrates and is installed substantially in the center as an example. Further, on the upper surface portion 4, a spray nozzle 7 is installed at a position facing the output shaft 2 and a connection hole 8 for a dust collecting hose Sh is formed. Here, the positions of the spray nozzle 7 and the connection hole 8 are arranged around the output shaft 2 so as to be separated from each other on the left and right sides thereof.
The spray nozzle 7 atomizes the water supplied via the supply hose Wh and sprays it. The spray nozzle 7 is provided on the upper surface portion 4 so that the spray nozzle 7 can be sprayed on the back surface of the rotary foil RH and the processed surface of the workpiece W. For example, the spray nozzle 7 is provided on the upper surface portion 4 so that the ratio of direct spraying from the outer peripheral end of the rotating foil RH, which is the processed surface of the workpiece W, to the inner side surface of the peripheral side surface portion 5 is 20% or more. is set up.

The spray nozzle 7 can instantly diffuse the sprayed water to the entire inside of the dust collection cover 3 by allowing a part of the spray to directly hit the back side of the rotating foil RH that rotates at high speed. Further, the spray nozzle 7 sprays 20% or more directly onto the machined surface of the workpiece W to supply moisture to the machined surface and suppress dust rising from the machined surface. By directly supplying the water sprayed from the spray nozzle 7 to the machined surface of the workpiece W, the rotating wheel RH diffuses the entire lower surface of the rotating wheel RH, and the water is sprayed on the back side of the rotating wheel RH. The collected water will be diffused into the space of the dust collection cover 3. The spray nozzle 7 sprays the workpiece W directly onto the machined surface at a rate of preferably 30% or more, more preferably 50% or more, still more preferably 60% or more.
The spray nozzle 7 is mounted or mounted so that the sprayed water positions are all on the processed surface or the back side of the rotating foil RH if the spraying conditions are as shown below. You may set the direction.

When the spray state (spray pattern) of the spray nozzle 7 is directed in the vertical direction, for example, the inside of the cone becomes a space and the inside of the cone becomes an annular shape, and the inside of the cone also It may be in a filled cone state in which all are sprayed. Further, the spray nozzle 7 may have a spray pattern of a reference fan shape, a uniform fan shape, a wide-angle fan shape, a uniform single fan shape, or the like. The particle size of the water sprayed by the spray nozzle 7 may be, for example, in the range of 45 to 1950 μm. The pressure applied to the spray nozzle 7 is preferably in the range of 0.1 to 0.7 MPa as a standard pressure. If the particle size sprayed from the spray nozzle 7 is less than 45 μm, the standard pressure of the pump used becomes high, which is not preferable. Further, if the particle size of the sprayed water exceeds 2000 μm, the mist approaches water droplets, and the entire inside of the dust collection cover 3 cannot be sufficiently diffused, and there is a possibility that the water leaks from the lower end of the dust collection cover 3. There is. Therefore, the spray nozzle 7 is most preferably used with a water particle size of 45 to 1950 μm and a standard pressure of 0.1 to 0.7 Mpa.

The connection hole 8 is formed in the upper surface portion 4 so that the dust collecting hose Sh can be detachably connected. The connection hole 8 is formed so as to penetrate the upper surface portion 4 of the dust collecting cover 3 so as to have a diameter of, for example, 20 to 50 mm. The connection hole 8 is formed to have a size of a diameter that can efficiently suck dust and sludge G containing water sprayed on the dust and air in the dust collection cover 3 to collect dust. The connection hole 8 is provided with an existing configuration such as a screw type or an attachment so that the dust collecting hose Sh can be connected and detachably fixed.

As shown in FIGS. 1, 4 and 5, the peripheral side surface portion 5 is formed in an annular shape, and when the rotating foil RH is attached, the side surface side of the rotating foil RH is combined with the moving side surface portion 6. It is intended to prevent the scattering of dust due to covering and processing. The peripheral side surface portion 5 is integrally formed from the upper surface portion 4.
The moving side surface portion 6 moves along the peripheral side surface portion 5 in a direction (vertical direction) orthogonal to the circumferential direction to prevent dust from scattering. The moving side surface portion 6 is lowered by a support portion 6a, 6c provided on the peripheral side surface portion 5 or the upper surface portion 4, an urging portion 6b composed of an elastic member supported between the support portions 6a, 6c, and the urging portion 6b. It is provided with an annular side surface portion 6d that is constantly urged to the surface and a contact portion 6e provided at the lower end of the annular side surface portion 6d.
One support portion 6a is provided on the peripheral side surface portion 5 and / or the upper surface portion 4 and supports one end side of the urging portion 6b. The other support portion 6c is provided on the annular side surface portion 6d and supports the other end side of the urging portion 6b.
A plurality of support portions 6a and 6 are arranged as a pair at regular intervals in the circumferential direction of the dust collection cover.

The urging portion 6b is an elastic member such as a coil spring, and always urges the annular side surface portion 6d downward. The urging portion 6b is formed so that when the tool body 1 is pressed against the workpiece W side by an operator's operation, the annular side surface portion 6d can move upward against the urging force.
The annular side surface portion 6d is formed so as to be able to move up and down along the peripheral surface of the peripheral side surface portion 5. The annular side surface portion 6d forms the peripheral side surface of the dust collecting cover 3 together with the peripheral side surface portion 5 and the contact portion 6d. Further, the annular side surface portion 6d has a contact portion 6e formed at the lower end thereof.

The contact portion 6e is provided with a brush as an example so that the rotary tool 10 can move in a state of being in contact with the workpiece W. The contact portion 6e is formed by bundling thin resin wires and providing them at the lower end of the annular side surface portion 6d to form a brush having a uniform density in the circumferential direction. In the case of a brush, the contact portion 6e is preferably formed with a high density so that the water sprayed into the dust collecting cover 3 is less likely to leak.

The rotary wheel RH is an existing one in which the substrate is provided with a cutting blade or a grinding blade generally used for cutting or grinding work. The rotary wheel RH includes a portion where the substrate is processed and a portion which supports the portion to be processed and is attached to the tool body 1. The rotary wheel RH is formed, for example, so that the center of the substrate projects to one side, and a through hole to be attached to the output shaft 2 is formed in the protruding center. Further, the rotary foil RH is provided with cutting blades or grinding blades on the peripheral surface of the lower surface of the substrate at predetermined intervals in the circumferential direction.

Next, the dust collector / circulation device 50 will be described with reference to FIGS. 1 and 2.
The dust collection / circulation device 50 stores, inside the housing 51, a supply tank 52 that supplies water to the spray nozzle 7 via the supply hose Wh, and sludge G that collects water via the dust collection hose Sh, and also collects water. The filter 54 for filtering and the supply pump 55 for supplying the water filtered by the filter 54 from the supply tank 52 to the spray nozzle 7 via the supply hose Wh are provided.

The housing 51 is configured so that a closed space can be formed inside so that the negative pressure is lower than the atmospheric pressure. The housing 51 is configured so that the housing body and the housing lid can create a negative pressure inside the housing 51 via rubber packing or the like. Further, the housing 51 is provided with wheels for moving the housing 51.
The supply tank 52 is formed by using the lower side of the housing 51 as an example. The supply tank 52 stores the water sent to the spray nozzle 7 via the supply hose Wh, and also stores the water filtered through the sludge G. The supply tank 52 may be formed in a box shape having an upper opening so as to be separate from the housing 51, and may be installed in the housing 51.

The water stored in the supply tank 52 is sent to the spray nozzle 7 by the supply hose Wh using the supply pump 55. The supply pump 55 is, for example, a gear pump and is formed so that a preset amount of water can be sent to the spray nozzle 7 via the supply hose Wh. As the supply pump 55, for example, a pump capable of supplying water to the spray nozzle 7 at 0.1 to 0.7 MPa is used as an example here.

The dust collecting pump 53 creates sludge G mixed with dust and water generated in the dust collecting cover 3 via the dust collecting hose Sh by making the inside of the housing 51 negative pressure, together with the air in the dust collecting cover 3. It collects dust. The dust collecting pump 53 is, for example, a vacuum pump, and sucks sludge G in the dust collecting cover 3 by reducing the pressure inside the housing 51. The sludge G collected by the dust collection pump 53 is stored in the bag-shaped filter 54 via a center pipe connected to the dust collection hose Sh in the housing 51.

The filter 54 filters the collected sludge G. The filter 54 filters sludge G to allow water to permeate, and the filtered water permeates outside the filter 54 and is stored in the supply tank 52. The filter 54 is formed in a bag shape so that it can be treated by, for example, filtering water from the sludge G and discarding the sludge G accumulated inside together with the filter 54.

Next, the operation of the wet dust collection and circulation system 100 will be described.
In explaining this operation, for example, in the wet dust collection and circulation system 100, it is assumed that a coating film containing asbestos is peeled off as a work piece W.
In the wet dust collection and circulation system 100, the dust collection and circulation device 50 is carried near the machined surface of the work piece W, and the operator operates the rotary tool 10 to perform the work of the work piece W.
By turning on the rotary tool 10, the operator also switches on the interlocking dust collecting and circulating device 50 to operate the dust collecting pump 53 and the supply pump 55. In the wet dust collection and circulation system 100, water is sprayed from the spray nozzle 7, and the inside of the housing 51 is made negative pressure to suck air or the like in the dust collection cover 3 from the connection hole 8 through the dust collection hose Sh. The operation is performed.

In the rotary tool 10, the water sprayed from the spray nozzle 7 spreads in the dust collecting cover 3 and on the machined surface of the workpiece W by rotating the rotary foil RH. The rotary tool 10 is operated so as to bring the rotary wheel RH into contact with the workpiece W and to press the dust collecting cover 3 against the workpiece W while holding the tool body 1. In the rotary tool 10, when the dust collecting cover 3 is pushed toward the workpiece W side, the annular side surface portion 6d and the contact portion 6e, which is a brush, move upward against the urging portion 6b of the moving side surface portion 6. Then, the rotating foil RH is in a state where it can come into contact with the workpiece W, and the machining work of grinding the machined surface which is the surface of the workpiece W is performed.

Then, in the rotary tool 10, when the rotary wheel RH grinds the workpiece W, dust is generated in the dust collection cover 3, but the dust collection cover 3 is sprayed from the spray nozzle 7. Since it is filled with mist-like water, water adheres to the generated dust. Therefore, even if dust such as asbestos is generated in the dust collecting cover 3 together with the dust of the coating film, the sludge G is likely to be in a state where the mist-like moisture adheres to the dust and is difficult to scatter. Then, in the dust collection cover 3, the sludge G and the air in the dust collection cover are collected from the connection hole 8 via the dust collection hose Sh by the dust collection pump 53, so that the dust leaks out of the dust collection cover 3. It is suppressed from coming out. Further, the rotary tool 10 performs the machining work while moving on the workpiece W, but since the water supplied to the dust collecting cover 3 is sprayed in the form of mist, it is easy to collect dust and collect dust. Leakage from between the contact portion 6e of the cover 3 and the surface of the workpiece W can also be minimized.

When the rotary tool 10 is performing the machining work, the dust collecting and circulating device 50 always collects the dust by the dust collecting pump 53, so that the sludge G, which is the dust to which the moisture is attached, is collected. The dust collector / circulation device 50 stores the sludge G in the bag-shaped filter 54, and the filter 54 filters water from the sludge G. Then, the dust collector / circulation device 50 stores the filtered water in the supply tank 52, and the supply pump 55 supplies water from the supply tank 52 to the spray nozzle 7 via the supply hose Wh to supply water. Circulate and use.
As described above, in the wet dust collection and circulation system 100, sludge G is formed by spraying water on the dust by the rotary tool 10 and the dust collection and circulation device 50, and water and dust are collected and filtered by collecting the dust. Then, the filtered water can be circulated and used. Therefore, in the wet dust collection and circulation system 100, it is possible to reduce the size of the supply tank 52 and realize the miniaturization.

In the rotary tool 10, the mounting position of the spray nozzle 7 is not limited to the upper surface portion 4 as long as the spray nozzle 7 can be sprayed toward the inside of the dust collecting cover 3, but the position of the peripheral side surface portion 5 or the upper surface portion 4. And the peripheral side surface portion 5. Further, the spray nozzle 7 may be installed in the front center of the upper surface portion 4. Further, the spray nozzles 7 may be installed at two or more places on the dust collection cover 3. When a plurality of spray nozzles 7 are installed on the dust collection cover 3, when the spray patterns to be sprayed are in an empty cone state or a filled cone state, some of the spray nozzles 7 may or may not overlap each other. It may be formed so as to be separated from each other. When some of the spray patterns from the spray nozzle 7 overlap, it is preferable to arrange them side by side on the front side of the dust collection cover 3 as shown in FIG. When the spray patterns from the spray nozzles 7 do not overlap, it is preferable that the connection holes 8 of the dust collecting hose Sh and the other spray nozzles 7 are installed at equal intervals in the circumferential direction.

Next, when the spray nozzle 7 is used for the rotary tool 10 via the supply hose Wh by using the wet dust collection and circulation system 100 according to the present invention, and when the spray nozzle 7 is not used and the flowing water is used as it is from the supply hose Wh. An embodiment of the case of supplying will be described.
An example of the wet dust collection and circulation system 100 is a configuration in which a spray nozzle 7 is used for the dust collection cover 3 of the rotary tool 10, and a configuration in which the spray nozzle 7 is removed and a water stream is directly supplied into the dust collection cover 3 is compared. An experiment was conducted as an example.

As the supply pump 55 used for the dust collector / circulation device 50, a gear pump model (TG-30S-PU-EB TG-85E-PU-EBX) was used. The rotary tool 10 is a rotary wheel RH with an outer diameter of 95 mm, a grinding blade thickness of 1 mm, a grinding blade width of 1.5 mm, and a hole diameter of 15 mm for mounting. Product name "Silent Thick Film Huggers" Kureei Seisakusho Co., Ltd. Was used. Further, the supply pump 55 was set so as to be 0.1 MPa when spraying water from the spray nozzle 7 or when water was directly supplied into the dust collection cover from the supply hose Wh.
In the wet dust collection circulation system 100 provided with the spray nozzle 7 and the wet dust collection system in a state where the spray nozzle 7 was not used, concrete was ground as the workpiece W in 10 minutes under the same conditions as described above. When grinding concrete, the rotary wheel RH was rotated, and the rotary tool 10 was ground at a constant moving speed and a fixed moving range. Table 1 shows the results of comparing the amounts of sludge G collected by grinding.

As shown in Table 1, when grinding was performed by spraying from the spray nozzle 7, the amount of sludge G recovered was 2.9 kg, of which 0.5 kg was concrete powder and filtered water. The amount was 2.4 kg.
On the other hand, when water was supplied without the spray nozzle 7, the amount of sludge G recovered was 5.7 kg, of which 0.5 kg of concrete powder and 5.2 kg of filtered water. It was.

As described above, since the water is atomized and supplied from the spray nozzle 7 in the example, it was found that the sludge G can be appropriately collected with a small amount of water. As for the amount of water, as shown in Table 2, the result of comparing the amount of water per unit time (cc / min) between the case where the spray nozzle 7 is used and the case where the spray nozzle 7 is not used is approximately 1/5. It can be seen that the amount of water is.
As described above, in the wet dust collection and circulation system 100, it is possible to perform processing work such as cutting or grinding with a smaller amount of water as compared with a configuration using running water while minimizing the scattering of dust. Become. Therefore, in the wet dust collection and circulation system 100, the amount of water used in the supply tank 52 of the dust collection and circulation device 50 is small, and the device can be miniaturized, which makes it easy to operate and carry.

1 Tool body 2 Output shaft 3 Dust collection cover 4 Top surface 5 Circumferential side surface 6 Moving side surface 6a Support 6b Biasing 6c Support 6d Ring side surface 6e Abutment 7 Spray nozzle 8 Connection hole 10 Rotating tool 50 Dust circulation device 51 Housing 52 Supply tank 53 Dust collection pump 54 Filter 55 Supply pump 100 Wet dust collection and circulation system G Sludge RH Rotating foil Sh Dust collection hose W Work piece Wh Supply hose

Claims (5)

In a rotary tool having an output shaft to which a rotary foil for cutting or grinding a workpiece is attached and driven to rotate, and a dust collecting cover for covering one side of the rotary foil attached to the output shaft.
The dust collecting cover has an upper surface portion through which the output shaft penetrates, a peripheral side surface portion continuous with the upper surface portion, and an annular moving side surface portion movably provided in a direction perpendicular to the circumferential direction of the peripheral side surface portion. And a contact portion that abuts on the upper surface of the work piece, which is provided along the circumferential direction at the lower end of the moving side surface portion.
A rotary tool characterized in that the upper surface portion or the peripheral side surface portion is provided with connection holes for a spray nozzle and a dust collecting hose so as to penetrate from the outer wall surface of the cover to the inner wall surface of the cover. .. The rotary tool according to claim 1, wherein the connection holes of the spray nozzle and the dust collection hose are installed at positions of the upper surface portions facing each other across the output shaft. The claim is that the spray nozzle is provided at a position where at least 20% or more is sprayed between the outer peripheral end of the rotating foil and the peripheral side surface portion when the rotating foil is attached to the output shaft. 1 or the rotary tool according to claim 2. The moving side surface portion is provided at an annular side surface portion that moves in a direction orthogonal to the circumferential direction along the peripheral side surface portion, an urging portion that urges the annular side surface portion downward, and a lower end of the annular side surface portion. With the contact portion
The rotary tool according to any one of claims 1 to 3, wherein the contact portion is a brush provided with a thin line of resin. A rotary tool having an output shaft to which a rotary foil for cutting or grinding a work piece is attached and driven to rotate, and a dust collecting cover for covering one side of the rotary foil attached to the output shaft, and a rotary wheel of the rotary tool. A wet dust collection and circulation system including a dust collection and circulation device that supplies water to be sprayed to dust generated by cutting or grinding a work piece and collects dust.
The dust collecting cover of the rotary tool is an annular shape provided so as to have an upper surface portion through which the output shaft penetrates, a peripheral side surface portion continuous with the upper surface portion, and a direction perpendicular to the circumferential direction of the peripheral side surface portion. It is provided with a moving side surface portion and a contact portion provided along the circumferential direction at the lower end of the moving side surface portion and in contact with the upper surface of the work piece.
A spray nozzle and a connection hole for a dust collection hose are provided on the upper surface portion or the peripheral side surface portion of the dust collection cover so as to penetrate from the outer wall surface of the cover to the inner wall surface of the cover so as to be separated from each other.
The dust collection / circulation device includes a supply tank that supplies water to the spray nozzle via a supply hose, a dust collection pump that collects sludge mixed with water and dust via the dust collection hose, and the dust collection pump. It is provided with a filter for storing the sludge collected in the above and separating water from the sludge, and a supply pump for supplying the water separated by the filter from the supply tank to the spray nozzle via the supply hose. Wet dust collection and circulation system.

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