JP2013094926A - Power tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve dust collection efficiency of a cyclone unit without impairing compactness of a dust box, unlike the prior art, in which dust is collected by a single cyclone unit so that it is difficult to improve the dust collection efficiency of the cyclone unit while securing compactness thereof, in a bench circular saw machine having a cyclone dust collection type dust box.SOLUTION: A plurality of cyclone units 32, 32 are disposed in a box body 31, in parallel with each other. Dust collecting air in the box body 31 is blanched and used in each cyclone unit 32 to separate and collect powder dust. Without impairing the compactness, particularly, in a height direction of the dust box 30, a dimension balance of each cyclone unit 32 is desirably set to increase the dust collection efficiency thereof.

Description

  The present invention relates to a power tool that generates dust by processing, such as a desktop circular saw machine or a band saw called a slide marnoco.

A tabletop circular saw machine is a cutting tool that includes a table on which a cutting material is placed and a main body portion that can be moved up and down via a main body support portion provided on the table. A rotating circular saw blade is provided. With the cutting material positioned and fixed on the table, cutting can be performed by cutting a rotating saw blade into the cutting material by moving the main body downward. This type of cutting tool is equipped with a dust box forming a box or a dust bag forming a bag in order to collect dust such as cutting powder generated by cutting. Usually, these are connected to the rear part of the blade case covering the upper half of the upper side of the saw blade. When cutting is performed by the rotation of the saw blade, dust such as cutting powder is wound up from the cutting portion into the upper blade case. The wound dust is blown off to the rear side along the inner surface of the blade case and collected in the dust box. When the generated dust is collected in the dust box, the dust is prevented from being scattered around and a good working environment is maintained.
Conventionally, various ideas have been made for the dust box and the dust bag for the purpose of increasing the dust collection efficiency. For example, for a dust box that forms a box, a swirling flow of dust collection air (wind containing dust such as cutting powder, the same applies hereinafter) is generated inside, and the centrifugal force generated thereby collects the dust. It is known to have a cyclone unit that separates from the stream. Techniques relating to the dust box with the cyclone unit are disclosed in the following patent documents.
According to the dust boxes disclosed in these, the cyclone unit is mainly composed of an outer cylinder for dust collection and an inner cylinder for exhaust, and the outer cylinder is placed in the box via an intake port provided offset from the center thereof. It is attached vertically to the rear part of the main body, and the inner cylinder is coaxially arranged along the center of the outer cylinder. The flow of dust-collecting air containing dust blown into the outer cylinder from the box body through the connection port becomes a swirling flow around the inner cylinder along the inner surface of the outer cylinder. After being collected along the inner surface of the outer cylinder, it is discharged from the lower discharge port. The air from which dust such as cutting powder has been separated is exhausted from the lower part of the inner cylinder to the outside through the inner peripheral side and from the upper exhaust port.
Thus, after dust-collecting air is made to flow into the box body, dust can be collected more efficiently by separating the dust from the dust-collecting air using a centrifugal cyclone unit.

JP 2006-198826 A JP 2006-88539 A

However, it is necessary to further improve the dust box provided with the conventional cyclone unit. In particular, the conventional cyclone unit described above suppresses the pressure rise in the box body by further improving the dust separation performance in the outer cylinder, thereby promoting the inflow of dust-collected air into the box body. It was necessary to further increase the dust collection efficiency.
The present invention has been made in view of the conventional problems, and it is an object of the present invention to further improve the dust collection efficiency of the dust box by further increasing the dust separation efficiency of the cyclone unit.

The above problems are solved by the following invention.
1st invention has the table which mounts a cutting material, and the tool main-body part provided so that movement operation was possible up and down above the table, and the cutting tool provided with the saw blade which a tool main-body part rotates by an electric motor The tool body includes a blade case that covers the saw blade and a dust box for collecting dust in the blade case. The dust box includes an outer cylinder that is offset-connected to the box body, and an outer cylinder. The cutting tool includes an inner cylinder supported on the inner side of the cylinder, and includes a plurality of cyclone units that separate dust from the dust collection air by centrifugal force generated by the swirling flow of the dust collection air along the inner surface of the outer cylinder.
According to the first invention, the dust collecting air blown into the box body branches and flows into the plurality of cyclone units, and the dust is centrifuged from the dust collecting air in each cyclone unit. For this reason, it is possible to more efficiently centrifuge the dust from the dust collecting wind than in the case of using a single cyclone unit as in the prior art, thereby increasing the dust collection efficiency of the dust box.
In addition, by providing a plurality of cyclone units, it is possible to adopt an ideal dimensional balance for the axial length and diameter of the outer cylinder and the inner cylinder while reducing the size of each cyclone unit. The dust collection efficiency of the dust box can be further increased while reducing the size of the circular saw.
2nd invention is a dual cyclone type cutting tool provided with the cyclone unit in the left-right both sides of a box main body in 1st invention.
According to the second invention, the dust collecting air blown into the box body is branched and blown into two cyclone units arranged on the left and right, and the dust is separated from the dust collecting air in each of the left and right cyclone units. Is done. For this reason, compared with the case of using a single cyclone unit, the dust is more efficiently centrifuged, and the dust collection efficiency of the dust box can thereby be increased.
A third invention is a cutting tool according to the first or second invention, wherein a plurality of cyclone units are assembled to a box body.
According to the third invention, since a plurality of cyclone units can be handled as one assembly, the handling property of the dust box and its assembling property with respect to the box body can be improved.
According to a fourth aspect of the present invention, in any one of the first to third aspects, the box body includes a dust-collecting air branching portion that branches the dust-collecting air toward the plurality of cyclone units, and the dust-collecting air branch is provided. This is a cutting tool in which a branch surface provided corresponding to a plurality of cyclone units has an arc shape.
According to the fourth aspect of the invention, the dust collecting air blown into the dust box is blown to the branch surface having an arc shape and is efficiently branched to the plurality of cyclone units. Enhanced.
According to a fifth invention, in the fourth invention, cyclone units are provided on both the left and right sides of the box body, and the connection ports for offset connection to the box body provided in the outer cylinders of the left and right cyclone units are provided with dust collecting air. It is a cutting tool in which the left and right cyclone units are assembled to each other via a branch portion.
According to the fifth aspect of the invention, the two right and left cyclone units are connected to each other via the dust collecting air branching portion and assembled, thereby improving the handling property and the assembling property to the box body.
A sixth invention is a power tool for generating dust by processing, comprising a dust box for collecting the dust, the dust box including an outer cylinder offset connected to the box body, and the outer cylinder A power tool including a plurality of cyclone units for separating dust from the dust collecting air by centrifugal force generated by a swirling flow of the dust collecting air along the inner surface of the outer cylinder. .
According to the sixth invention, dust generated by processing is collected in a dust box and branched into a plurality of cyclone units to collect dust more efficiently. Therefore, in a conventional single cyclone dust box, In comparison, the dust collection efficiency can be increased. Further, as in the case of the first invention, the dust collection efficiency is improved by adopting an ideal dimensional balance for the axial length and diameter of the outer cylinder and the inner cylinder without impairing the compactness of the cyclone unit. Can do.
The multi-cyclone dust box is a hand-held or stationary power tool such as a portable circular saw, a chip saw cutter, a portable band saw, a disk grinder, a sander or a polisher in addition to the tabletop circular saw, for example, cutting, cutting It can be widely applied to dust boxes of power tools that generate dust by various processes such as grinding

1 is an overall side view of a desktop circular saw machine according to an embodiment of the present invention. This figure shows an initial state in which the tool body is returned to the upper moving end position and the slide start end position. It is a whole perspective view of the tabletop circular saw machine concerning this embodiment. This figure has shown the state seen from the diagonally left front side on the user side. The tool main body is shown in a state where it is returned to the upper moving end position and the slide start end position as in FIG. It is a whole perspective view of the tabletop circular saw machine concerning this embodiment. This figure has shown the state seen from diagonally left back on the opposite side to a user side. The tool main body is shown in a state where it is returned to the upper moving end position and the slide start end position as in FIG. It is a whole side view of the desk circular saw machine concerning this embodiment. This figure shows a state in which the tool body is moved down to the lower end position at the slide start end position. It is a disassembled perspective view of the dust box concerning this embodiment. This figure has shown the state which removed two assembled cyclone units from the box main body. Moreover, this figure has shown the state seen from the user side. It is a disassembled perspective view of the dust box concerning this embodiment. In the figure, the box body and the assembled cyclone unit are also disassembled. It is the front view which looked at the dust box of the decomposition | disassembly state from the arrow (VII) direction in FIG. It is the rear view which looked at the dust box of the decomposition | disassembly state from the arrow (VIII) direction in FIG. FIG. 6 is a cross-sectional view taken along line (IX)-(IX) in FIG. 5, and is a cross-sectional view of two cyclone units assembled through a dust collecting wind branching portion.

Next, an embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 to 3, in this embodiment, a tabletop circular saw 1 is illustrated as an example of a power tool. The table-top circular saw machine 1 is a table-type circular saw machine (cutting tool) called a so-called slide marnoko, and supports a table 2 on which a cutting material W is placed and the table 2 so as to be rotatable in the horizontal direction. A base 3, a main body support 10 provided at the rear of the table 2, and a tool main body 20 supported above the table 2 via the main body support 10 are provided. In FIG. 1, the user is located on the right side of the tabletop circular saw machine 1. In the following description, the user side is the front side.
Fixed pedestals 3 a and 3 a are provided on the left and right sides of the base 3. The cutting material W is fixed in a state where a slight gap is provided between the left and right fixed pedestal portions 3 a and 3 a and the upper surface of the table 2.
A grip portion 4 that is held by a user is provided at the front portion of the table 2. By grasping the grip portion 4 and rotating the table 2 in the left-right direction with respect to the cutting material W, the cutting material W can be so-called obliquely cut.
The main body support portion 10 has a function of supporting the tool main body portion 20 so that it can tilt up and down and slide back and forth above the table 2. The main body support section 10 includes a pair of left and right lower slide bars 11 and 11 parallel to each other, a support leg section 12, and a pair of left and right upper slide bars 13 and 13 parallel to each other. The rear end portions of the left and right lower slide bars 11 are fixed to the lower portion of the support leg portion 12. The lower slide bars 11 and 11 are supported on the rear portion of the table 2 so as to be slidable in the front-rear direction. The left and right upper slide bars 13 are supported on the upper portion of the support leg portion 12 so as to be slidable back and forth. A main body support bracket 14 is attached to the front end portions of the left and right upper slide bars 13 and 13. A tool body 20 is supported on the front ends of the left and right upper slide bars 13 and 13 via a vertically tilting support shaft 15 provided on the body support bracket 14 so as to be tiltable up and down.

The tool body 20 includes a circular saw blade 22 that is rotated by an electric motor 21. The range of the upper half circumference of the saw blade 22 is covered with a blade case 23. The rear portion of the blade case 23 is supported by the front portions of the upper slide bars 13 and 13 via the vertical tilt support shaft 15. A range of the lower half circumference of the saw blade 22 protruding downward from the blade case 23 is covered with a movable cover 24. The movable cover 24 is opened by the downward movement of the tool body 20 by a link arm (not shown) and closed by the upward movement. As shown in FIG. 4, when the tool body 20 is moved downward, the movable cover 24 is rotated counterclockwise in the drawing to open, and the lower portion of the saw blade 22 exposed thereby is cut into the cutting material W. Is included.
On the back side of the blade case 23 (on the right side when viewed from the user), a loop-shaped handle portion 25 that is gripped by the user is provided. A switch lever 26 is provided inside the handle portion 25. When the switch lever 26 is pulled with the fingertip of the hand holding the handle portion 25, the electric motor 21 is activated and the saw blade 22 rotates.
On the further right side of the handle portion 25, a lighting device 27 is provided. The illuminating device 27 illuminates the cutting site and its periphery brightly to facilitate the cutting work in the dark.
A loop-shaped carrying handle 28 is also provided at the rear of the handle portion 25. By using this carrying handle 28, the tabletop circular saw machine 1 can be carried with good balance.

A cylindrical dust collection port 29 is provided at the rear part of the blade case 23. The dust box 30 of this embodiment is connected to the dust collection port 29. The dust box 30 collects dust such as cutting powder blown up from the cutting site into the blade case 23 by the cutting operation. As the saw blade 22 rotates, dust such as cutting powder blows up from the cutting site into the blade case 23, and a wind flow in the same direction as the saw blade 22 rotates in the blade case 23. Dust and the like that are riding and blown into the blade case 23 are blown off toward the dust collection port 29 on the rear side of the blade case 23.
Wind (dust collecting air) containing dust in the blade case 23 generated by the rotation of the saw blade 22 is blown into the box body 31 of the dust box 30 through the dust collecting port 29. Details of the dust box 30 are shown in FIG. The dust box 30 includes one box body 31 and two cyclone units 32 and 32.
The box body 31 has a left and right halved structure. A connection port 33 is provided at the front of the box body 31. The connection port 33 is provided to be tiltable up and down with respect to the box body 31. This connection port 33 is connected to a dust collection port 29 on the blade case 23 side. For this reason, the dust box 30 is supported so as to be tiltable up and down within a certain angle range with respect to the blade case 23. The dust collection air in the blade case 23 is blown into the box body 31 through the dust collection port 29 and the connection port 33.
The box body 31 includes a central main dust collection chamber 31M and auxiliary dust collection chambers 31S and 31S on the left and right sides of the main dust collection chamber 31M. As shown in FIG. 6, between the main dust collection chamber 31M and the left and right auxiliary dust collection chambers 31S and 31S, a range from approximately the middle to the rear side in the front-rear direction is partitioned by a wall portion 31a.
A connection port 33 is provided at the front of the main dust collection chamber 31M. The dust collecting air in the blade case 23 flows to the rear side mainly through the main dust collecting chamber 31M through the connection port 33.
The lower surface of the box body 31 is provided with a large opening 35 that extends over the main dust collection chamber 31M and the left and right auxiliary dust collection chambers 31S and 31S. The discharge port 35 is closed by a discharge lid 34. A lock lever 36 is provided at the rear of the box body 31. The lock lid 36 locks the discharge lid 34 in a state where the discharge port 35 is closed. When the lock lever 36 is rotated rearward to release the engagement state with respect to the rear portion of the discharge lid 34, the lid 34 can be opened. By opening the discharge lid 34, the dust accumulated in the box body 31 can be discarded at a time.

Cyclone units 32 and 32 are provided side by side on the left and right sides on the rear side of the box body 31. The left and right cyclone units 32, 32 are bilaterally symmetric and have the same configuration. Details of the cyclone units 32, 32 are shown in FIG. The cyclone unit 32 includes an outer cylinder 32a and an inner cylinder 32b each having a cylindrical shape. The small-diameter inner cylinder 32b is supported substantially coaxially by the inside of the larger-diameter outer cylinder 32a. The diameter of the outer cylinder 32a and the inner cylinder 32b is set to a ratio of approximately 2: 1.
An outer cylinder cap 32c is attached to the upper part of the inner cylinder 32b. The outer cylinder cap 32c is attached to the upper part of the outer cylinder 32a, and the upper part of the outer cylinder 32a is closed. Further, the inner cylinder 32b is supported along the center of the outer cylinder 32a via the outer cylinder cap 32c.
A rectangular connection port 32d is provided on the side of the outer cylinder 32a. The connection port 32d is connected to the box body 31 via a dust collecting air branching section 40 described later. The connection port 32d is provided at an offset position off the center of the outer cylinder 32a. Dust collecting air flows from the box body 31 into the outer cylinder 32a through the connection port 32d. In FIG. 9, the dust-collected air that has flowed into the outer cylinder 32a through the connection port 32d provided at the offset position off the center as indicated by the white arrow is on the inner peripheral side and around the inner cylinder 32b. The swirl flow turns around. Due to the centrifugal force generated by the swirling flow, the dust moves to the inner peripheral surface of the outer cylinder 32a and is separated from the dust collecting air. The dust separated from the dust collecting air falls downward along the inner surface of the outer cylinder 32a by its own weight.
A discharge port 32e is provided at the lower portion of the outer cylinder 32a. The discharge port 32e of the outer cylinder 32a is connected to a connection port provided on the upper surface of the auxiliary dust collection chamber 31S. For this reason, the dust which fell along the inner surface of the outer cylinder 32a is discharged | emitted in the auxiliary | assistant dust collection chamber 31S through the discharge port 32e with the dead weight. In the swirling flow in the outer cylinder 32a, the clean air from which the dust is separated is exhausted from the lower part of the inner cylinder 32b through the inner peripheral side of the inner cylinder 32b.

The dust collecting air branching portion 40 has a hollow block shape having connection ports 40a, 40a on both left and right side portions. The connection ports 32d of the cyclone unit 32 are connected to the left and right connection ports 40a and 40a, respectively. As shown in FIG. 5, the left and right cyclone units 32, 32 are joined together via the dust collecting air branching section 40 and assembled into one.
A rectangular intake window 40 b is formed on the front surface of the dust collecting air branch 40. A pair of left and right branch surfaces 40c and 40c are provided in the back of the intake window 40b. As shown in FIG. 9, both branch surfaces 40c and 40c are curved in a direction in which they swell rearward in a semicircular arc shape.
In the rear portion of the box body 31 (the rear portion of the main dust collecting chamber 31M), an insertion port 31b for inserting the dust collecting wind branching portion 40 is provided so as to be cut from above. When the dust collecting wind branching portion 40 is inserted and attached to the insertion port 31b from above, the intake window 40b is directed to the front of the box body 31 at the rear portion of the main dust collecting chamber 31M.
For this reason, as shown by the white arrow in FIG. 9, the dust-collecting air blown into the box body 31 from the blade case 23 through the connection port 33 flows backward (upward in FIG. 9) and branches the dust-collecting air. Part 40 is sprayed on. When the dust-collecting air is blown to the dust-collecting air branching portion 40, the dust-collecting air is blown into the inside through the intake window 40b and is blown to the left and right branch surfaces 40c and 40c. Since the branch surfaces 40c and 40c are each curved in an arc shape, the dust collecting air is smoothly branched left and right and guided toward the left and right connection ports 40a and 40a. The dust-collected wind branched to the left and right becomes a swirling flow in the outer cylinder 32a of the cyclone unit 32, and dust is efficiently collected by the centrifugal force generated thereby.
With the dust collecting air branching portion 40 inserted into the insertion port 31b, the dust collecting air branching portion 40 is fixed to the box body 31 by fitting the fixing lid 41 into the insertion port 31b, and thus assembled. The left and right cyclone units 32 and 32 are respectively held on the left and right sides of the main dust collection chamber 31M and above the auxiliary dust collection chambers 31S and 31S. The left and right cyclone units 32, 32 are screwed to the side of the main dust collection chamber 31M with their discharge ports 32e connected to connection ports provided on the upper surface of the auxiliary dust collection chamber 31S. Fixed to the main body 31.

According to the desktop circular saw machine 1 of the present embodiment configured as described above, dust such as cutting powder generated by the rotation of the saw blade 22 is blown upward from the cutting portion, and becomes a dust collecting wind as it is. 23 is blown rearward. The dust-collected air that flows to the rear of the blade case 23 is blown into the box body 31 of the dust box 30 through the dust collection port 29 and the connection port 33. The dust-collected air blown into the box body 31 is branched into the two left and right cyclone units 32 and 32 and collected, so that the dust collection efficiency of the dust box 30 can be improved as compared with the case of the conventional one cyclone unit. It can be further increased.
Moreover, the dust-collected air blown into the box body 31 flows rearward as it is and is blown against the dust-collected air branching section 40. The dust-collected air blown to the dust-collected air branching section 40 is smoothly branched left and right by a pair of left and right branch surfaces 40c, 40c having an arc shape and guided to the cyclone unit 32, respectively. As described above, since the dust collecting air is smoothly branched by the arc-shaped branch surfaces 40c and 40c, the increase of the wind pressure in the box body 31 is suppressed and the inflow of the dust collecting air into the box body 31 is promoted. Also in this respect, the dust collection efficiency of the dust box 30 can be increased.
Further, according to the desktop circular saw machine 1 of the present embodiment, the two left and right cyclone units 32 and 32 are assembled to each other via the dust collecting branching section 40. For this reason, the handling property of the two cyclone units 32 and 32 and the assembling property to the box body 31 can be improved.
Furthermore, by providing the two cyclone units 32 and 32, each cyclone unit 32 can be reduced in size, and thereby the dust box 30 and the desk circular saw machine 1 can be reduced in size.
In particular, in a cyclone type dust collector that separates dust by centrifugal force generated by swirling flow, it is necessary to ensure its sufficient separation function, and generally the axial length of the outer cylinder size is approximately the diameter. It is necessary to set to about 3 times. However, if a long outer cylinder is used to ensure a sufficient separation function, the height of the dust box will be increased and its compactness will be impaired, so there is a limit to increasing the size of the outer cylinder and thus the cyclone unit. Conventionally, there has been a problem that the dimensional balance of the axial length and diameter of the outer cylinder and the inner cylinder is poor, and dust is easily mixed into the exhaust gas.
In this regard, according to this embodiment, an ideal dimensional balance is set for the axial length and diameter of the outer cylinder 32a and the inner cylinder 32b by using two (plural) cyclone units 32 and 32 in parallel. Thus, the dust collection efficiency can be further enhanced while the dust box 30 is particularly compact in the height direction (the axial length of the outer cylinder 32a in each cyclone unit 32).

The embodiment described above can be implemented with various modifications. For example, although the configuration in which the arcuate branch surfaces 40c and 40c are provided for the dust collecting wind branch portion 40 has been illustrated, a flat inclined surface may be used as the branch surface.
Moreover, it is good also as a structure which abbreviate | omits the branch surfaces 40c and 40c of the dust collection wind branch part 40, or omits the dust collection wind branch part 40 itself, and connects each cyclone unit 32 to the box main body 31 directly.
Furthermore, although the dust box 30 provided with the two cyclone units 32 and 32 was illustrated, it is good also as a structure provided with three or more cyclone units.
Further, the dust box 30 that guides the dust into the box body 31 by using the flow of the dust collecting air generated by the rotation of the saw blade 22 is exemplified. However, the dust box is not limited to this, and the dust is forced by the dust collecting fan rotated by the electric motor. In particular, the present invention can be applied to a dust box that collects dust in the box body.
Further, the table-like circular saw machine 1 has been exemplified as a power tool, but it is a hand-held or stationary power tool such as a portable marnoco, tip saw cutter, portable band saw, disc grinder, sander or polisher, which can be used for cutting, cutting, grinding, etc. It can be widely applied to a dust box of a power tool that generates dust by various processes.

W ... Cutting material 1 ... Table circular saw 2 ... Table 3 ... Base 3a ... Fixed pedestal part 4 ... Grip part 10 ... Main body support part 11 ... Lower slide bar 12 ... Support leg part 13 ... Upper slide bar 14 ... Main body support Bracket 15 ... Vertical tilting support shaft 20 ... Tool body 21 ... Electric motor 22 ... Saw blade 23 ... Blade case 24 ... Movable cover 25 ... Handle portion 26 ... Switch lever 27 ... Lighting tool 28 ... Carrying handle 29 ... Dust collecting port 30 ... Dust box 31 ... Box body 31M ... Main dust collection chamber, 31S ... Auxiliary dust collection chamber 31a ... Wall, 31b ... Inlet 32 ... Cyclone unit 32a ... Outer cylinder, 32b ... Inner cylinder, 32c ... Outer cylinder cap, 32d ... Connection port 32e ... Discharge port 33 ... Connection port 34 ... Discharge lid 35 ... Discharge port 36 ... Lock lever 40 ... Dust-collecting air branch 41 ... Fixed lid

Claims (6)

A cutting tool provided with a table for placing a cutting material, and a tool main body provided so as to be movable up and down above the table, the tool main body being provided with a saw blade that is rotated by an electric motor,
The tool body includes a blade case that covers the saw blade, and a dust box for collecting dust in the blade case,
The dust box includes an outer cylinder offset connected to the box body, and an inner cylinder supported on the inner side of the outer cylinder, and the centrifugal force generated by the swirling flow of dust collecting air along the inner surface of the outer cylinder Cutting tool equipped with multiple cyclone units that separate dust from the dust collection air. It is a cutting tool of Claim 1, Comprising: The cutting tool provided with the said cyclone unit in the right-and-left both sides of the said box main body. The cutting tool according to claim 1 or 2, wherein the plurality of cyclone units are assembled to the box body. The cutting tool according to any one of claims 1 to 3, wherein the box body includes a dust-collecting air branch portion that branches dust-collecting air toward the plurality of cyclone units. The cutting tool in which the branch surface provided corresponding to the plurality of cyclone units of the dust wind branch portion has an arc shape. The cutting tool according to claim 4, wherein the cyclone unit is provided on both left and right sides of the box body, and a connection port for an offset connection to the box body provided on an outer cylinder of the cyclone unit is the collecting tool. A cutting tool in which the left and right cyclone units are assembled by being connected to each other via a dust wind branch. A power tool for generating dust by processing, comprising a dust box for collecting the dust,
The dust box includes an outer cylinder offset connected to the box body, and an inner cylinder supported on the inner side of the outer cylinder, and the centrifugal force generated by the swirling flow of dust collecting air along the inner surface of the outer cylinder A power tool with multiple cyclone units that separate dust from the dust collection air.

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