CN112004639B - Belt type grinding tool - Google Patents
Belt type grinding tool Download PDFInfo
- Publication number
- CN112004639B CN112004639B CN201980025338.3A CN201980025338A CN112004639B CN 112004639 B CN112004639 B CN 112004639B CN 201980025338 A CN201980025338 A CN 201980025338A CN 112004639 B CN112004639 B CN 112004639B
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- Prior art keywords
- outer peripheral
- belt
- peripheral portion
- drive pulley
- opening
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
- B24B55/02—Equipment for cooling the grinding surfaces, e.g. devices for feeding coolant
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
- B24B23/06—Portable grinding machines, e.g. hand-guided; Accessories therefor with abrasive belts, e.g. with endless travelling belts; Accessories therefor
Abstract
Provided is a belt-type grinding tool capable of cooling an endless grinding belt more efficiently. The belt grinding tool (10) is provided with a fan (36) disposed inside the outer peripheral portion (28) of the drive pulley (22). A ventilation path (68) is formed in the belt-type grinding tool (10), and the ventilation path (68) passes through the inside of the outer peripheral portion (28) from the inside opening (62) of the cover (52), passes through the through hole (46) of the drive pulley (22), then bypasses the side end edge (28b) of the outer peripheral portion (28), passes through the outside of the outer peripheral portion (28), and reaches the outside opening (64) of the cover (52). When the fan (36) rotates together with the drive pulley (22), outside air is sucked into the housing space (58) from the inner opening (62), flows along the ventilation path (68), and is discharged out of the housing space (58) from the outer opening (64). The drive pulley (22) and the endless grinding belt (24) are efficiently cooled by the air.
Description
Technical Field
The present invention relates to a belt-type grinding tool, and more particularly, to a belt-type grinding tool having a function of cooling an endless grinding belt.
Background
The belt type grinding tool is a tool as follows: the grinding machine is provided with an idle pulley rotatably disposed, a drive pulley rotationally driven by a motor, and an endless grinding belt wound around the idle pulley and the drive pulley, and grinds an object to be ground by pressing the endless grinding belt driven to rotate in accordance with the rotation of the drive pulley against the object to be ground (patent document 1). In such a belt-type grinding tool, the annular grinding belt is heated by friction with the grinding object during the grinding operation.
As the endless grinding belt is heated, the drive pulley, the motor shaft, and the like also become heated, and in particular, the bearings supporting them to rotate sometimes deteriorate due to heat. In order to solve such a problem, for example, in a belt grinder shown in patent document 2, a fan is provided in a drive roller, and the fan is rotated together with the drive roller, whereby outside air is sucked into a tool. The drawn air passes through the inside of the drive roller and is guided into the dust bag by another dust collection fan. Thus, air flows around the shaft of the drive roller and the bearing supporting the shaft to rotate, so that these components are cooled by the flow of the air.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open No. 2014-166668
Patent document 2: japanese examined patent publication (Kokoku) No. 6-13827
Disclosure of Invention
Problems to be solved by the invention
Still another problem when heated as an endless grinding belt is breakage of the endless grinding belt. The annular grinding belt is generally formed into an annular belt shape by bonding both ends of a belt-like material with an adhesive, but if the bonded portion is excessively heated, the adhesive may melt and the belt may be broken. In the above-described conventional belt grinder, the drive roller is cooled to indirectly cool the endless grinding belt to some extent, but in the belt grinder, the shaft and the bearing of the drive roller are mainly cooled, and the cooling effect on the endless grinding belt is not sufficient.
Accordingly, an object of the present invention is to provide a belt-type grinding tool capable of efficiently cooling an endless grinding belt wound around an idle pulley and a drive pulley.
Means for solving the problems
Namely, the present invention provides a belt-type grinding tool,
the belt type grinding tool comprises:
a tool body provided with a motor;
an idle pulley rotatably attached to the tool body;
a drive pulley that is rotationally driven by the motor and has a cylindrical outer peripheral portion that supports an endless grinding belt that is wound between the drive pulley and the idler pulley;
a fan, at least a part of which is disposed radially inward of the outer peripheral portion, the fan rotating together with the drive pulley and generating a flow of air passing through the inner side of the outer peripheral portion in a direction of a rotation axis of the drive pulley;
a cover having a cover plate portion disposed adjacent to one end edge of the outer peripheral portion in the direction of the rotation axis, and defining a housing space for housing the drive pulley between the cover and the tool body, the cover having an inner opening portion and an outer opening portion formed in the cover plate portion, the inner opening portion opening into the housing space at a position radially inward of an inner peripheral surface of the outer peripheral portion, the outer opening portion opening into the housing space at a position radially outward of the inner peripheral surface of the outer peripheral portion; and
a ventilation path passing through the inner side of the outer peripheral portion from the inner opening portion in the housing space, passing around the other end edge of the outer peripheral portion, passing through the outer side of the outer peripheral portion, and reaching the outer opening portion,
when the fan rotates, outside air is sucked into the accommodating space from one of the inner opening and the outer opening, flows along the ventilation path, and is discharged out of the accommodating space from the other of the inner opening and the outer opening.
In this belt-type grinding tool, the air drawn into the housing space by the fan passes not only inside the outer peripheral portion of the drive pulley but also outside the outer peripheral portion of the drive pulley. Therefore, not only the drive pulley but also the endless grinding belt supported on the outer peripheral surface of the outer peripheral portion is directly cooled. This enables the annular grinding belt to be cooled more efficiently, and breakage of the annular grinding belt due to heat can be prevented.
Specifically, the cover plate portion may have a groove hole extending from a position radially inside to a position radially outside of the inner peripheral surface of the outer peripheral portion, and the inner opening and the outer opening may be formed as a part of the groove hole.
Preferably, the slot extends in a curved manner with respect to a radial direction of the axis of rotation. The opening area can be increased compared to a straight hole, and air can be more efficiently sucked into the housing space.
Preferably, the slot is of a size that is inaccessible to a human finger. This prevents fingers from being injured by accidentally touching the rotating drive pulley and the endless grinding belt. The "size that cannot be entered by a human finger" refers to a size that cannot be entered into the storage space by a test selected in accordance with the usage environment.
Specifically, the drive pulley may further include: a center fixing portion connected to a rotating shaft that is driven and connected to the motor; and a connecting portion extending from the outer peripheral portion to the center fixing portion, a through hole penetrating in the direction of the rotation axis being formed in the connecting portion, and the ventilation route passing through the through hole.
More specifically, when the fan rotates, the external air may be drawn into the housing space from the inner opening along the ventilation path, pass through the inner side of the outer peripheral portion, pass through the through hole, pass around the other end edge of the outer peripheral portion, pass through the outer side of the outer peripheral portion, and be discharged from the outer opening to the outside of the housing space.
Preferably, the fan may have a plurality of blades arranged at first intervals in a circumferential direction of the outer peripheral portion, and the through-holes may be arranged at second intervals different from the first intervals in the circumferential direction.
More preferably, a gap in the direction of the rotation axis may be formed between the fan and the coupling portion of the drive pulley. This prevents the through hole from being blocked by the fan.
In addition, the present invention provides a belt-type grinding tool,
the belt type grinding tool comprises:
a tool body provided with a motor;
an idle pulley rotatably attached to the tool body;
a drive pulley that is rotationally driven by the motor and has a cylindrical outer peripheral portion that supports an endless grinding belt that is wound between the drive pulley and the idler pulley;
a fan, at least a part of which is disposed radially inward of the outer peripheral portion, the fan rotating together with the drive pulley to generate a flow of air passing through the inner side of the outer peripheral portion in a direction of a rotation axis of the drive pulley; and
a cover having a cover plate portion disposed adjacent to one end edge of the outer peripheral portion in the direction of the rotation axis, and defining a housing space for housing the drive pulley between the cover and the tool body, the cover having a slot formed in the cover plate portion, the slot extending from an inner opening portion that opens into the housing space at a position radially inward of an inner peripheral surface of the outer peripheral portion, to an outer opening portion that opens into the housing space at a position radially outward of the inner peripheral surface of the outer peripheral portion,
when the fan rotates, the external air is sucked into the accommodating space from the slot hole, passes through the inner side of the outer peripheral part and is discharged out of the accommodating space.
According to this belt-type grinding tool, since the groove hole provided in the cover extends from the inside to the outside of the outer peripheral portion of the drive pulley, when external air is sucked into the housing space by the fan, the air is blown to the outer peripheral portion at the side end edge. In addition, the opening area of the slot hole is increased, so that more air can be sucked. This enables the drive pulley to be efficiently cooled.
Hereinafter, embodiments of a belt type grinding tool according to the present invention will be described with reference to the drawings.
Drawings
Fig. 1 is a side view of a belt type grinding tool according to an embodiment of the present invention.
Fig. 2 is a side view of the belt-type grinding tool of fig. 1 with a cover removed.
Fig. 3 is a partial sectional view taken along line a-a of fig. 1.
Fig. 4 is a diagram showing a second embodiment of the cover.
Fig. 5 is a diagram showing a third embodiment of the cover.
Fig. 6 is a diagram showing a fourth embodiment of the cover.
Fig. 7 is a diagram showing a fifth embodiment of the cover.
Detailed Description
As shown in fig. 1 to 3, a belt-type grinding tool 10 according to an embodiment of the present invention includes: a tool body 12 extending in the direction of the longitudinal axis L; an idler pulley 16 rotatably attached to the distal end portion 14 of the tool body 12; and a drive pulley 22 fixed to the rotary shaft 20, and the electric motor 18 of the tool body 12 is connected to drive the rotary shaft 20. An endless grinding belt 24 is wound between the idle pulley 16 and the drive pulley 22. The drive pulley 22 is driven by the electric motor 18 to rotate in a counterclockwise direction as viewed in fig. 2, and the endless grinding belt 24 also rotates in the same direction. A shoe 25 is attached to the tool body 12 so as to extend along the inner circumferential surface 24a of the annular grinding belt 24, and the rotating annular grinding belt 24 is pressed against the grinding object at a position supported from the inside by the shoe 25, whereby the grinding operation is performed on the grinding object.
As shown in fig. 3, the drive pulley 22 includes: a cylindrical center fixing portion 26 fixed to the rotary shaft 20; a cylindrical outer peripheral portion 28 that supports the annular grinding belt 24; and a coupling portion 30 extending in a radial direction with respect to the rotation axis R of the drive pulley 22 so as to couple the center fixing portion 26 and the outer peripheral portion 28. The drive pulley 22 is fixed to the rotary shaft 20 by a hexagonal nut 32 screwed to the rotary shaft 20. Flange portions 34 for preventing the annular grinding belt 24 from falling off are provided on the side end edges 28a, 28b on both sides of the outer peripheral portion 28 in the direction of the rotation axis R, respectively.
A fan 36 is provided radially inward of the outer peripheral portion 28 of the drive pulley 22. The fan 36 has a center fixing portion 38 and blades 40 extending radially outward from the center fixing portion 38. As is apparent from fig. 2, five blades 40 are arranged at equal intervals in the circumferential direction. The fan 36 is fixed to the hexagonal nut 32 by the fixing screw 42 in a state where a part of the hexagonal nut 32 is accommodated in the central fixing portion 38. The inner peripheral surface 38a of the center fixing portion 38 in which the hexagonal nut 32 is accommodated is formed in a hexagonal shape matching the outer diameter of the hexagonal nut 32, so that the fan 36 is reliably fixed in the rotational direction with respect to the hexagonal nut 32. The fixing screw 42 is fixed in a state where an end face 42a thereof abuts on the end face 20a of the rotary shaft 20. This makes it difficult for the hexagon nut 32 and the fixing screw 42 to loosen. An O-ring 44 is disposed between the fan 36 and the hexagonal nut 32, and is used to press the fan 36 against the head of the fixing screw 42 to prevent the fan 36 from rattling. The entire fan 36 is positioned inside the outer peripheral portion 28, but the fan 36 may be formed in a shape in which a part thereof protrudes outside the outer peripheral portion 28.
A through hole 46 penetrating in the direction of the rotation axis R is formed in the coupling portion 30 of the drive pulley 22. In fig. 2, a part of the through-holes 46 is hidden and not visible by the blades 40 of the fan 36, but eight through-holes 46 are provided at equal intervals in the circumferential direction. By arranging the blades 40 of the fan 36 and the through holes 46 at different intervals in the circumferential direction, the front surfaces of all the through holes 46 are not shielded by the blades 40 regardless of the direction in which the fan 36 is attached to the drive pulley 22 in the rotational direction. Further, a gap 48 in the direction of the rotation axis R is formed between the blade 40 of the fan 36 and the coupling portion 30 of the drive pulley 22 so that the through hole 46 of the coupling portion 30 is not blocked by the blade 40 of the fan 36 and does not obstruct the flow of air described later.
A cover 52 is attached to the tool body 12 by a fixing screw 50. The cover 52 has: a fixing portion 54 fixed to the tool body 12 by a fixing screw 50; and a cover plate portion 56 disposed adjacent to one end edge 28a of the outer peripheral portion 28 in the direction of the rotation axis R, and defining a housing space 58 for housing the drive pulley 22 between the cover 52 and the tool body 12. As shown in fig. 1, the cover plate 56 is provided with a plurality of slots 60 extending in a curved manner in the radial direction of the rotation axis R. The groove hole 60 extends from a radially inner position to a radially outer position of the inner circumferential surface 28c of the outer circumferential portion 28 of the drive pulley 22, and includes: an inner opening 62 that opens into the housing space 58 at a position radially inward of the inner circumferential surface 28c of the outer circumferential portion 28; and an outer opening 64 that opens into the housing space 58 at a radially outer position. The slot 60 is sized to prevent fingers of a person from entering the receiving space 58. Specifically, the slot 60 is designed to be of a size that is inaccessible into the receiving space 58 by appropriately selected tests matched to the environment of use. The test used in the design of this embodiment is based on international standard IEC 60529. An arrow-shaped hole 66 showing the rotation direction of the drive pulley 22 is formed near the center of the cover plate portion 56.
In the belt grinding tool 10, the vent route 68 indicated by an arrow in fig. 3 is formed by the above-described structure. The vent path 68 passes from the inner opening 62 of the cover 52 to the inside of the outer peripheral portion 28 of the drive pulley 22, passes through the through hole 46 of the coupling portion 30, then bypasses the other end edge 28b of the outer peripheral portion 28, passes through the outside of the outer peripheral portion 28, and reaches the outer opening 64. As described above, the fan 36 disposed inside the drive pulley 22 is fixed to the rotary shaft 20, and therefore, when the drive pulley 22 is driven to rotate, the drive pulley 22 rotates together with the fan 36. When the fan 36 rotates, a flow of air passing through the inside of the outer peripheral portion 28 of the drive pulley 22 in the direction of the rotation axis R is generated by the fan 36. Thus, the air is caused to flow along the ventilation route 68. Specifically, the outside air is sucked into the housing space 58 through the inner opening 62, passes through the inner side of the outer peripheral portion 28 of the drive pulley 22 where the fan 36 is disposed, and flows out to the outer side of the drive pulley 22 through the through hole 46. The air passing through the through hole 46 comes into contact with the inner peripheral surface 58a of the housing space 58 and changes its direction radially outward, thereby bypassing the other-side end edge 28b of the outer peripheral portion 28. The air further passes outside the outer peripheral portion 28, and is discharged from the outer opening 64 to the outside of the housing space 58. A part of the air discharged from the outer opening 64 is drawn into the housing space 58 again from the inner opening 62 after flowing along the groove hole 60 or once flowing out to the outside of the cover 52. Further, since the front portion 58b (the upper portion as viewed in fig. 1 and 2) and the lower portion 58c (the left portion as viewed in fig. 1 and 2) of the housing space 58 are open, a part of the air sucked into the housing space 58 passes through the through-hole 46 and is discharged from the front portion 58b and the lower portion 58c to the outside of the housing space 58. Since the front portion 58b and the lower portion 58c are portions through which the annular grinding belt 24 passes, a part of the air discharged from the front portion 58b and the lower portion 58c is blown to the annular grinding belt 24.
In this way, in the belt type grinding tool 10, the air sucked to the outside of the housing space 58 by the fan 36 passes through both the inside and the outside of the outer peripheral portion 28 of the drive pulley 22, and therefore the drive pulley 22 can be cooled more effectively. Therefore, the endless grinding belt 24 can be cooled more efficiently via the drive pulley 22. Further, since the air flowing through the air passage 68 also directly contacts the annular grinding belt 24 when passing outside the outer peripheral portion 28, the annular grinding belt 24 can be directly cooled. As a result, the annular grinding belt 24 can be cooled more efficiently than the conventional belt-type grinding tool 10, and breakage of the annular grinding belt 24 due to heat can be prevented.
In addition, in the above embodiment, since the groove hole 60 extends from the inside to the outside of the outer peripheral portion 28 of the drive pulley 22 and is also located at the portion of the one side end edge 28a of the outer peripheral portion 28, when air is sucked from the groove hole 60, air is caused to be blown to the outer peripheral portion 28 at the side end edge 28 a. This also enables the drive pulley 22 to be efficiently cooled, and the annular grinding belt 24 to be more reliably prevented from being broken by heat. In addition, since a part of the air discharged from the front portion 58b and the lower portion 58c of the housing space 58 is blown to the annular grinding belt 24, the annular grinding belt 24 can be cooled.
The shape and arrangement of the inner opening 62 and the outer opening 64 provided in the cover 52 can be changed arbitrarily. For example, in the cover 152 shown in fig. 4, the inner opening 162 and the outer opening 164 are formed as separate holes. However, in this case, air does not blow on the outer peripheral portion 28 of the drive pulley 22. In the cover 252 shown in fig. 5, the slot 260 is formed in a zigzag shape so that the area of the outer opening 264 is increased. In the cap 352 shown in fig. 6, the slot 360 is bent in the opposite direction to the cap 52 of fig. 1. In the cover 452 shown in fig. 7, the linear long groove holes 4601 and the short groove holes 4602 are alternately arranged in the circumferential direction. The shapes and the arrangements of the above-described slot holes, inner openings, and outer openings are examples, and other forms may be used.
The embodiments of the present invention have been described above, but the present invention is not limited to these embodiments. For example, in the above embodiment, the outside air is sucked from the inside opening portion and discharged from the outside opening portion, but the air may be reversely flowed by reversing the rotation direction of the driving pulley, reversing the direction of the blades of the fan, or the like. That is, the outside air may be sucked into the housing space from the outer opening portion, pass through the outer side of the outer peripheral portion of the drive pulley, pass around the other end edge of the outer peripheral portion, pass through the through hole of the coupling portion and the inner side of the outer peripheral portion, and be discharged from the inner opening portion to the outside of the housing space. Further, it is preferable to provide both a structure for directly blowing the air sucked into the housing space to the outer peripheral portion of the drive pulley and a structure for flowing along the air passage passing through the inner side and the outer side of the outer peripheral portion, but both of these structures are not necessarily required, and even with only one of them, a sufficiently excellent cooling effect can be obtained as compared with the conventional art. In addition, the number of the blades of the fan and the number of the through holes of the coupling portion may be changed. The above embodiment is an electric belt type grinding tool including an electric motor, but may be a pneumatic belt type grinding tool using an air motor instead of the electric motor.
Description of reference numerals:
10-belt type grinding tool
12 tool body
14 tip end portion
16 idler pulley
18 electric motor
20 rotating shaft
20a end face
22 drive pulley
24 annular grinding belt
24a inner peripheral surface
25 sliding shoe
26 center fixing part
28 outer peripheral portion
28a side end edge
28b side end edge
28c inner peripheral surface
30 connecting part
32 hexagonal nut
34 flange part
36 Fan
38 center fixing part
38a inner peripheral surface
40 blade
42 set screw
42a end face
44O-shaped ring
46 through hole
48 gaps
50 set screw
52 cover
54 fixed part
56 cover plate part
58 accommodating space
58a inner peripheral surface
58b front part
58c lower part
60 slotted hole
62 inner side opening part
64 outer opening part
66 arrow-shaped holes
68 vent route
152 cover
162 inner opening part
164 outer opening
252 cover
260 slotted hole
264 outer opening part
352 cap
360 slotted hole
452 cover
460-1 longer slot
460-2 short slotted hole
L length axis
R axis of rotation.
Claims (9)
1. A belt-type grinding tool in which, in a belt-type grinding tool,
the belt type grinding tool comprises:
a tool body provided with a motor;
an idle pulley rotatably attached to the tool body;
a drive pulley that is rotationally driven by the motor and has a cylindrical outer peripheral portion that supports an endless grinding belt that is wound between the drive pulley and the idler pulley;
a fan, at least a part of which is disposed radially inward of the outer peripheral portion, the fan rotating together with the drive pulley and generating a flow of air passing through the inner side of the outer peripheral portion in a direction of a rotation axis of the drive pulley;
a cover having a cover plate portion disposed adjacent to one end edge of the outer peripheral portion in the direction of the rotation axis, and defining a housing space for housing the drive pulley between the cover and the tool body, the cover having an inner opening portion and an outer opening portion formed in the cover plate portion, the inner opening portion opening into the housing space at a position radially inward of an inner peripheral surface of the outer peripheral portion, the outer opening portion opening into the housing space at a position radially outward of the inner peripheral surface of the outer peripheral portion; and
a ventilation path passing through the inner side of the outer peripheral portion from the inner opening portion in the housing space, passing around the other end edge of the outer peripheral portion, passing through the outer side of the outer peripheral portion, and reaching the outer opening portion,
when the fan rotates, outside air is sucked into the accommodating space from one of the inner opening and the outer opening, flows along the ventilation path, and is discharged out of the accommodating space from the other of the inner opening and the outer opening.
2. The belt grinding tool according to claim 1,
the cover plate portion has a groove hole extending from a position radially inside to a position radially outside of the inner peripheral surface of the outer peripheral portion, and the inner opening and the outer opening are formed as a part of the groove hole.
3. The belt grinding tool according to claim 2,
the slot extends in a curved manner with respect to a radial direction of the rotation axis.
4. The belt grinding tool according to claim 2 or 3,
the slot hole is the size which can not be entered by human fingers.
5. The belt grinding tool according to any one of claims 1 to 3,
the drive pulley further includes: a center fixing portion connected to a rotating shaft that is driven and connected to the motor; and a connecting portion extending from the outer peripheral portion to the center fixing portion, a through hole penetrating in the direction of the rotation axis being formed in the connecting portion, and the ventilation route passing through the through hole.
6. The belt grinding tool according to claim 5,
when the fan rotates, external air is sucked into the accommodating space from the inner opening along the ventilation route, passes through the inner side of the outer peripheral part, passes through the through hole, bypasses the other side end edge of the outer peripheral part, passes through the outer side of the outer peripheral part, and is discharged out of the accommodating space from the outer opening.
7. The belt grinding tool according to claim 5,
the fan has a plurality of blades arranged at first intervals in a circumferential direction of the outer peripheral portion, and the through-holes are arranged at second intervals different from the first intervals in the circumferential direction.
8. The belt grinding tool according to claim 5,
a gap in the direction of the rotation axis is formed between the fan and the coupling portion of the drive pulley.
9. A belt-type grinding tool in which, in a belt-type grinding tool,
the belt type grinding tool comprises:
a tool body provided with a motor;
an idle pulley rotatably attached to the tool body;
a drive pulley that is rotationally driven by the motor and has a cylindrical outer peripheral portion that supports an endless grinding belt that is wound between the drive pulley and the idler pulley;
a fan, at least a part of which is disposed radially inward of the outer peripheral portion, the fan rotating together with the drive pulley and generating a flow of air passing through the inner side of the outer peripheral portion in a direction of a rotation axis of the drive pulley; and
a cover having a cover plate portion disposed adjacent to one end edge of the outer peripheral portion in the direction of the rotation axis, and defining a housing space for housing the drive pulley between the cover and the tool body, the cover having a slot formed in the cover plate portion, the slot extending from an inner opening portion that opens into the housing space at a position radially inward of an inner peripheral surface of the outer peripheral portion, to an outer opening portion that opens into the housing space at a position radially outward of the inner peripheral surface of the outer peripheral portion,
when the fan rotates, the external air is sucked into the accommodating space from the slot hole, passes through the inner side of the outer peripheral part and is discharged out of the accommodating space.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018086634 | 2018-04-27 | ||
| JP2018-086634 | 2018-04-27 | ||
| PCT/JP2019/013541 WO2019208086A1 (en) | 2018-04-27 | 2019-03-28 | Belt type grinding tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112004639A CN112004639A (en) | 2020-11-27 |
| CN112004639B true CN112004639B (en) | 2022-05-27 |
Family
ID=68293977
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980025338.3A Active CN112004639B (en) | 2018-04-27 | 2019-03-28 | Belt type grinding tool |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP3785848B1 (en) |
| JP (1) | JP6781844B2 (en) |
| KR (1) | KR102237638B1 (en) |
| CN (1) | CN112004639B (en) |
| TW (1) | TWI687279B (en) |
| WO (1) | WO2019208086A1 (en) |
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- 2019-03-28 KR KR1020207029689A patent/KR102237638B1/en active IP Right Grant
- 2019-03-28 WO PCT/JP2019/013541 patent/WO2019208086A1/en active Application Filing
- 2019-03-28 JP JP2019537001A patent/JP6781844B2/en active Active
- 2019-03-28 CN CN201980025338.3A patent/CN112004639B/en active Active
- 2019-03-28 EP EP19792609.0A patent/EP3785848B1/en active Active
- 2019-04-10 TW TW108112449A patent/TWI687279B/en active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55115758U (en) * | 1980-02-08 | 1980-08-15 | ||
| JPS6330463U (en) * | 1986-08-08 | 1988-02-27 | ||
| TW557045U (en) * | 2002-10-17 | 2003-10-01 | Taiwan Yamamoto Electric Ind C | Motor having cooling fan |
| CN101143426A (en) * | 2007-10-10 | 2008-03-19 | 苏州协成模具科技有限公司 | Hand-held grinding polishing machine air-cooled structure |
| JP2014166668A (en) * | 2013-02-28 | 2014-09-11 | Nitto Kohki Co Ltd | Belt grinder |
| CN105026104A (en) * | 2013-02-28 | 2015-11-04 | 日东工器株式会社 | Belt-type grinding tool |
| CN107745312A (en) * | 2016-06-28 | 2018-03-02 | 苏州宝时得电动工具有限公司 | The assembly and disassembly methods of sander and its operating method and working plate |
Also Published As
| Publication number | Publication date |
|---|---|
| TW202003152A (en) | 2020-01-16 |
| KR20200122408A (en) | 2020-10-27 |
| TWI687279B (en) | 2020-03-11 |
| JP6781844B2 (en) | 2020-11-04 |
| CN112004639A (en) | 2020-11-27 |
| EP3785848A4 (en) | 2022-01-19 |
| EP3785848A1 (en) | 2021-03-03 |
| JPWO2019208086A1 (en) | 2020-04-30 |
| KR102237638B1 (en) | 2021-04-07 |
| WO2019208086A1 (en) | 2019-10-31 |
| EP3785848B1 (en) | 2023-07-26 |
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