CN218575829U

CN218575829U - Electric grinding machine tool

Info

Publication number: CN218575829U
Application number: CN202222994588.XU
Authority: CN
Inventors: 陈邦和
Original assignee: Xpole Precision Tools Inc
Current assignee: Xpole Precision Tools Inc
Priority date: 2022-11-10
Filing date: 2022-11-10
Publication date: 2023-03-07
Anticipated expiration: 2032-11-10

Abstract

An electric grinding machine tool comprises an electric motor, a holding body, a shade connected with the holding body, an eccentric block positioned in the shade and driven by the electric motor, and an air flow generating piece hung on the eccentric block. The holding body is provided with at least one air passing hole, the air passing hole has a first distance relative to the axis of the electric motor, the shade is not provided with an air hole, the air flow generating piece is provided with a bottom plate and a plurality of fan blades, a second distance is arranged between the top edge of each fan blade and the holding body, a third distance is arranged between the outer edge of each fan blade and the shade, the second distance is at least 50% of each longitudinal length of the fan blades, the third distance is at least 50% of each radial length of the fan blades, and the outer diameter of the air flow generating piece is larger than the first distance.

Description

Electric grinding machine tool

Technical Field

The present invention relates to an electric grinding machine tool, and more particularly to an electric grinding machine tool that can effectively remove accumulated heat from a motor without an active dust-collecting structure.

Background

In the conventional electric grinding machine tool, an air flow generating member is generally attached to an eccentric block to generate a heat dissipating air flow through the air flow generating member, thereby discharging waste heat generated during the operation of the electric grinding machine tool. One embodiment is as disclosed in EP2132000B1 or as depicted in fig. 1. In the technical solution disclosed in fig. 1, a plurality of ventilation holes 611 are formed on a grinding disc cover 61 of the electric grinding machine tool 60, and the wind flow generating member 62 is disposed close to the ventilation holes 611 and close to a port where the grinding disc cover 61 is connected to a holding body 63. Ideally, when the airflow generating member 62 rotates, the airflow generating member 62 will introduce air from the ventilation holes 611 to dissipate heat, but the ventilation holes 611 are spaced apart from each other and the airflow generating member 62 is too close to the ventilation holes 611, so that the ventilation holes 611 cannot generate the expected effect. When one of the ventilation holes 611 is used for air intake, the other ventilation hole 611 connected to the rear one generates exhaust air, which causes a short flow problem (also called short circulation), as shown in fig. 2, such that the air intake efficiency of the ventilation holes 611 is not expected, the short flow problem further causes the heat dissipation effect of the air flow generator 62 to be limited to the eccentric block, the eccentric block can lead out waste heat due to the connection with the electric motor 64, but the shaft diameter of a shaft connecting the eccentric block and the electric motor 64 is generally small, the waste heat transfer speed is not faster than the heat generated by the electric motor 64 itself, and the waste heat is not accumulated, thereby affecting the feeling of the user when holding the user.

Furthermore, although some embodiments have a plurality of air inlet holes 631 formed on the holding body 63, and the air flow generating member 62 is rotated to draw external air into the holding body from the air inlet holes 631 to form a heat dissipating air flow, as can be seen from the above, the air flow generating member 62 has a problem of poor air inlet efficiency and fails to generate a suction force meeting the requirement, so that although the heat dissipating air flow passes through the electric motor 64, the heat dissipation of the electric motor 64 is limited due to the insufficient air volume of the air flow generating member 62, and the problem of waste heat accumulation of the electric motor 64 is still serious.

The only current embodiment that solves the above problems is to implement an active cleaning structure 71 on a power grinding machine tool 70, as shown in fig. 3 or EP2946710B 1. Referring to fig. 3, the air inlet of the active dust collecting structure 71 is an air inlet 721 opened on a grinding disc cover 72, when the active dust collecting structure 71 is implemented, the active dust collecting structure 71 will generate a suction force in the grinding disc cover 72, the suction force is significantly larger than the suction force generated by the airflow generator 73, and the air inlets 741 on the holding body 74 are connected to suck a large amount of air, and the large amount of air sucked from the air inlets 741 greatly helps the heat dissipation of an electric motor 75.

However, not all power tools can be equipped with the active dust-collecting structure, and there is still a need for a solution to the heat accumulation of the electric motor when the power tool is not equipped with the active dust-collecting structure.

SUMMERY OF THE UTILITY MODEL

The main purpose of the utility model is to solve the problem that the electric accumulated heat is difficult to discharge when the existing electric grinding machine tool is not provided with an active dust-absorbing structure.

The utility model discloses a secondary objective lies in solving current electronic grinding tool machine and producing the piece and correspond the design of structure and make the not good problem of heat dissipation wind current efficiency to the wind current.

To achieve the above object, the present invention provides an electric grinding machine tool, which comprises an electric motor, a holding body for holding the electric motor, a cover connected to the holding body, an eccentric block located in the cover and driven by the electric motor, and an air flow generator hung on the eccentric block. The holding body and the shade are provided with at least one air passing hole, the air passing hole has a first distance relative to the axis of the electric motor, the shade does not have an air vent, the air flow generating piece is provided with a bottom plate and a plurality of fan blades which are arranged on the same surface of the bottom plate at intervals and are arranged into a ring, a second distance is arranged between the top edge of each fan blade and the holding body, a third distance is arranged between the outer edge of each fan blade and the shade, the second distance is at least 50% of each longitudinal length of the fan blades, the third distance is at least 50% of each radial length of the fan blades, the third distance is at least 50% of each height of the fan blades, and the outer diameter of the air flow generating piece is larger than the first distance.

In one embodiment, the eccentric mass has a first portion connected to the electric motor and a second portion connected to the first portion, the second portion having an axis offset from an axis of the first portion, the airflow generating member being attached to the second portion.

In one embodiment, the level of the bottom edge of the wind flow generator coincides with the level of the bottom edge of the eccentric block.

In one embodiment, the wind flow generating member has an opening formed on the bottom plate and at least two hooks formed at the edge of the opening.

In one embodiment, the fan blades are not disposed on a side of the bottom plate facing a polishing disk.

In one embodiment, the cover gradually gets away from the wind flow generator from the top edge of each of the plurality of blades to the bottom edge of each of the plurality of blades, and a fourth distance is provided between the outer bottom edge of the wind flow generator and the cover, and the fourth distance is greater than the radial length of each of the plurality of blades.

In one embodiment, the mask has an inclined surface located inside and facing the blades, and the horizontal height of the top end of the inclined surface is equal to or higher than the horizontal height of each top edge of the blades.

In one embodiment, the holding body has a skirt for assembling the mask, and the inner edge of the skirt has a non-straight surface.

In one embodiment, the air passing hole is arc-shaped.

In one embodiment, the air hole is disposed along an edge of a motor housing disposed on the holding body.

In one embodiment, the electric grinding tool is provided with a plurality of air passing holes, and the air passing holes are identical in type and are arranged at intervals.

Through the utility model discloses aforementioned implement, compare in the conventional characteristics that have following: the utility model discloses need not to set up any this air vent from this shade side air inlet on this shade of this electric grinding machine tool, this air current produces the piece and should grip the space that forms between the body and the inner circle scope that this air current produced the piece, makes from this air current of passing through the short period of time flowing wherein, produces the piece by this air current again and smoothly guides and discharge between this shade and this abrasive disc. The utility model discloses this wind current produces a setting, makes this electric grinding machine tool can need not excessively to change this electric grinding machine tool basic design to and under the condition of not installing active dust collection structure, improve this electric motor heat that current design exists by a wide margin and store up the problem, increase the comfort level of user's centre of palm when gripping the use for a long time by a wide margin.

Drawings

FIG. 1 is a schematic view of a portion of a conventional electric grinding machine tool;

FIG. 2 is a schematic view of a conventional air flow generator for a power abrasive tool;

FIG. 3 is a partial schematic view of a conventional electric grinding machine tool;

FIG. 4 is a schematic view of the overall appearance of the electric grinding machine tool of the present invention;

FIG. 5 is an exploded view of the electric grinding machine tool of the present invention;

FIG. 6 is a schematic sectional view of the electric grinding machine tool of the present invention;

fig. 7 is a schematic top view of a partial structure of the electric grinding machine tool of the present invention;

FIG. 8 is a schematic top view of the wind flow generating member of the present invention;

fig. 9 is a schematic view (one) of the internal heat dissipation airflow of the electric grinding machine tool of the present invention;

fig. 10 is a schematic view (ii) of the internal heat dissipation airflow of the electric grinding machine tool of the present invention;

fig. 11 is a schematic structural view of the eccentric block attached to the wind flow generator of the present invention.

[ notation ] to show

20: electric grinding machine tool

21: electric motor

22: holding body

221: shell

222: outer cover

223: motor outer cover

224: channel

225: operation pressing plate

226: control module

227: air intake

228: air passing hole

229: connection plate

230: skirt edge

231: continuous concave-convex structure

232: baffle plate

233: tail section area

234: head segment region

24: shade cover

241: assembling port

242: release port

243: inclined plane

244: tip end

25: eccentric block

251: first part

252: the second part

26: wind flow generating member

261: base plate

262: fan blade

263: inner ring

264: outer ring

265: opening of the container

266: hook for hanging articles

267: ring wall

27: grinding disc

30: first distance

31: second distance

32: a third distance

33: a fourth distance

40: radiating air flow

50: air flow temporary storage area

60: electric grinding machine tool

61: grinding disk shade

611: air intake

62: wind flow generating member

63: grip body

631: air inlet

64: electric motor

70: electric grinding machine tool

71: active dust collection structure

72: dust-collecting plate shade

721: suction inlet

73: wind flow generating member

74: grip body

741: air inlet

75: electric motor

80: measuring point of palm center

81: finger grip measuring point

Detailed Description

The detailed description and technical contents of the present invention are described below with reference to the accompanying drawings:

referring to fig. 4 to 6, the present invention provides an electric grinding machine tool 20, wherein the electric grinding machine tool 20 includes an electric motor 21, a holding body 22 for providing the electric motor 21, a mask 24 connected to the holding body 22, an eccentric block 25 located in the mask 24 and driven by the electric motor 21, and an air flow generator 26 hung on the eccentric block 25. Wherein, the electric motor 21 can be an inward rotating structure or an outward rotating structure. In addition, the holding body 22 may be composed of a plurality of shells 221, one of the shells 221 may be used as a part of a housing 222, and besides the part of the shell 222, one of the shells 221 may also be used to form a motor housing 223, and when the shells 221 are assembled, the motor housing 223 is located in the space defined by the shells 221, that is, located in the holding body 22. The present invention provides a passage 224 for gas flow in the area between the motor housing 223 and the housing 222. The holding body 22 provides an operation pressing plate 225 and a control module 226 cooperating with the operation pressing plate 225 besides the electric motor 21. The holding body 22 further has a plurality of air inlet holes 227, and the air inlet holes 227 introduce external air when the airflow generating member 26 is activated. In one embodiment, at least one of the air inlets 227 is disposed corresponding to the control module 226. The cover 24 has an assembling opening 241 and a releasing opening 242 opposite to the assembling opening 241, the assembling opening 241 is used for assembling the holding body 22, the releasing opening 242 is still open when the cover 24 is assembled, and the releasing opening 242 faces to a grinding disc 27 installed on the eccentric block 25.

Referring to fig. 7, the holding body 22 of the present invention has at least one air hole 228, and the air hole 228 allows the holding body 22 to be in space communication with the mask 24 and is located in the channel 224. Referring also to fig. 6 and 8, the mask 24 of the present invention does not have an air vent, and specifically, the mask 24 itself only has the discharge openings 242 for the portion that allows airflow therethrough. On the other hand, the airflow generating member 26 of the present invention has a bottom plate 261 and a plurality of fan blades 262 disposed on the bottom plate 261. The blades 262 are in the same posture, and the blades 262 are not connected to each other and are spaced apart from each other on the same surface of the base plate 261. The fan blades 262 are arranged in a ring on the bottom plate 261, and further, referring to fig. 8, the fan blades 262 can be disposed along the edge of the bottom plate 261, and when viewed from the top of the wind flow generating member 26, the wind flow generating member 26 can be divided into an inner ring 263 without the fan blades 262 and an outer ring 264 disposed on the fan blades 262. Referring to fig. 6 and 7, the air passing hole 228 has a first distance 30 with respect to the axis of the electric motor 21, a second distance 31 is provided between the top edge of each of the blades 262 and the holding body 22, and a third distance 32 is provided between the outer edge of each of the blades 262 and the mask 24, more specifically, the second distance 31 is a distance from each of the blades 262 to a connecting plate 229 of the holding body 22 facing the mask 24. Further, the outer diameter of the wind flow generator 26 is greater than the first distance 30, the second distance 31 is at least 50% of each longitudinal length of the blades 262, and the third distance 32 is at least 50% of each radial length of the blades 262.

Referring to fig. 9 again, the air flow generator 26 of the present invention rotates along with the eccentric block 25, when the air flow generator 26 rotates, at least one heat dissipating air flow 40 is generated in the electric grinding machine tool 20, the heat dissipating air flow 40 uses the air inlet 227 as a starting point, and dissipates heat from the electric motor 21 through the channel 224, and then sequentially passes through the air passing hole 228 and the air flow generator 26 (as shown in fig. 10), and is discharged from the discharge hole 242 of the mask 24. Referring to fig. 10, the present invention utilizes the above design, when the heat dissipating airflow 40 passes through the air passing hole 228, it firstly enters the space between the airflow generating member 26 and the holding body 22 and the inner ring 263 of the airflow generating member 26, and then is guided and discharged by the fan blades 262. The aforesaid this wind current produces the space that produces between the body 26 and this grips and this wind current produces this inner circle 263 scope of 26 and can be called a wind current temporary storage area 50, and this wind current temporary storage area 50 makes this heat dissipation wind current 40 smoothly guided, makes the utility model discloses this electric grinding machine tool 20 must be equipped with under the active dust collecting structure condition, produces big wind current in this body 22 of gripping and dispels the heat, specifically improves the long-pending heat discharge difficult problem of this electric motor 21, increases the comfort level that the user mastered when gripping the use for a long time by a wide margin. Please refer to table one and table two, wherein table one is a temperature rise comparison table of the electric grinding machine tool (the utility model is called in the table), the conventional electric grinding machine tool without active dust absorption structure and with air vent on the mask (the utility model is called in the table without dust absorption), and the electric grinding machine tool with active dust absorption structure (the utility model is called in the table with dust absorption). The temperature measurement point is the palm position (indicated as 80 in fig. 4) at the user's hand, and the set conditions were 180W load, 80 grit paper, and 6 inches abrasive disk. The basic conditions in Table two are the same as those in Table one, except that the temperature measurement point is the user's finger (81 in FIG. 4).

Watch 1

Watch two

It can be understood from the first and second tables that the conventional dust-free person continuously operates for 15 minutes, the temperature of the palm measuring point and the finger grip measuring point is obviously increased, and the palm measuring point and the finger grip measuring point on the outer surface of the machine tool are already at such high temperature, so that the waste heat accumulation temperature of the electric motor in the machine tool is higher, and the problems that the electric motor accumulates heat and the conventional wind flow generating member cannot really function are highlighted in the description of the prior art. Furthermore, compare the utility model with the temperature of the conventional dust collector in the operation time of a plurality of machine tools, it can be known that the utility model is constructed under the condition that the active dust collection structure is not installed, the palm measurement point and the finger grip measurement point produce the performance which is obviously better than the conventional dust collector in the finger grip measurement point (table two) part except the performance of the conventional dust collector. Therefore, the utility model discloses really improve and do not solve this electric motor heat accumulation problem with the framework.

Referring to fig. 11, in one embodiment, the eccentric mass 25 has a first portion 251 connected to the electric motor 21, and a second portion 252 connected to the first portion 251, the axis of the second portion 252 is offset from the axis of the first portion 251, and the wind flow generator 26 is attached to the second portion 252. In one embodiment, the wind flow generator 26 has a bottom edge level corresponding to the bottom edge level of the eccentric mass 25.

Referring to fig. 8 and 11 again, in one embodiment, the wind flow generator 26 has an opening 265 opened on the bottom plate 261, and at least two hooks 266 formed at the edge of the opening 265. The two hooks 266 are oppositely disposed to be fixed on the eccentric block 25. In addition to the above, the wind flow generator 26 further has a ring wall 267 disposed around the opening 265. In one embodiment, the blades 262 are not disposed on the side of the bottom plate 261 facing the polishing disk 27. That is, the airflow generating member 26 does not have any fan blades on the side of the bottom plate 261 facing the polishing disk 27.

Referring back to fig. 6, in one embodiment, the mask 24 gradually moves away from the wind flow generating member 26 from the top edge of each of the blades 262 to the bottom edge of each of the blades 262, i.e., the mask 24 is flared. Furthermore, a fourth distance 33 is provided between the outer bottom edge of the wind flow generator 26 and the mask 24, and the fourth distance 33 is greater than the radial length of each of the fan blades 262. In one embodiment, the mask 24 has an inclined surface 243 at the inner side and facing the blades 262, and the top end (shown as 244) of the inclined surface 243 has a height equal to or higher than the height of each top edge of the blades 262.

Referring to fig. 5 and 6, in an embodiment, the holding body 22 has a skirt 230 for assembling the mask 24, the skirt 230 is formed with a continuous concave-convex structure 231, and the continuous concave-convex structure 231 provides the assembling opening 241 of the mask 24 to be sleeved on the continuous concave-convex structure 231. Further, the inner edge of the skirt 230 may be a continuous arc instead of a straight surface, and the inner edge of the skirt 230 may further form a continuous surface together with the inner edge of the mask 24.

Referring to fig. 7, in one embodiment, the air vent 228 is arc-shaped when viewed from a top view, and the air vent 228 is disposed along an edge of the motor housing 223. Further, when the power grinding machine tool 20 has a plurality of air passing holes 228, the air passing holes 228 are arranged in the same pattern and spaced apart from each other. In one embodiment, the motor housing 223 is formed with baffles 232 that form two opposing sides of the motor housing 223, the baffles 232 being positioned within the passageway 224. The baffle 232 forces the heat dissipating airflow 40 to be guided to the top edge of the motor housing 223 (as shown in fig. 9) and then to flow toward the air passing hole 228 (as shown in fig. 10), thereby reducing the temperature rise of the holding body 22 for the user to hold the palm. Furthermore, if the two baffles 232 are used to separate the inner space of the holding body 22, the inner space can be divided into a tail section 233 provided with the control module 226 and a head section 234, in this embodiment, the air inlet holes 227 provided on the holding body 22 are located in the tail section 233, and the air inlet holes 227 can be distributed in the tail section 233 when implemented, for example, one of the air inlet holes 227 can face the control module 226, and the other air inlet hole 227 can directly face the motor housing 223.

Claims

1. An electric grinding machine tool comprises an electric motor, a holding body for providing the electric motor, a shade connected with the holding body, an eccentric block positioned in the shade and driven by the electric motor, and an air flow generating piece hung on the eccentric block, characterized in that:

the holding body is provided with at least one air passing hole, the air passing hole has a first distance relative to the axis of the electric motor, the shade does not have an air vent, the air flow generating piece is provided with a bottom plate and a plurality of fan blades which are arranged on the same surface of the bottom plate at intervals and are arranged into a ring, a second distance is arranged between the top edge of each fan blade and the holding body, a third distance is arranged between the outer edge of each fan blade and the shade, the second distance is at least 50% of each longitudinal length of the fan blades, the third distance is at least 50% of each radial length of the fan blades, and the outer diameter of the air flow generating piece is larger than the first distance.

2. The power abrasive tool of claim 1, wherein the eccentric mass has a first portion connected to the electric motor and a second portion connected to the first portion, the second portion having an axis offset from an axis of the first portion, the wind flow generator being attached to the second portion.

3. The power abrasive tool machine of claim 1 or 2, wherein the wind flow generator has a bottom edge whose level corresponds to the level of the bottom edge of the eccentric mass.

4. The power abrasive tool of claim 3, wherein the airflow generating member has an opening defined in the base plate and at least two hooks formed on an edge of the opening.

5. The power abrasive machine tool of claim 4, wherein said plurality of fan blades are not disposed on a side of said base plate facing a polishing disk.

6. The power milling tool of claim 1 or 2, wherein the shield is gradually spaced from the wind flow generator from the top edge of each of the plurality of blades toward the bottom edge of each of the plurality of blades, and a fourth distance is provided between the outer bottom edge of the wind flow generator and the shield, the fourth distance being greater than the radial length of each of the plurality of blades.

7. An electric power abrasive machine tool as in claim 6 wherein said shroud has an inner facing ramp surface facing said plurality of blades, said ramp surface having a top end at a level equal to or greater than a level of each top edge of said plurality of blades.

8. An electric abrasive tool machine according to claim 1 or 2, wherein said holding body has a skirt providing said mask attachment, said skirt having an inner edge with a non-flat surface.

9. The power milling machine tool of claim 8, wherein the shroud is spaced from the wind flow generator from the top edge of each of the plurality of blades toward the bottom edge of each of the plurality of blades, the wind flow generator having a fourth distance between the outer bottom edge of the wind flow generator and the shroud, the fourth distance being greater than the radial length of each of the plurality of blades.

10. The power milling machine tool of claim 8, wherein the shroud has a bevel inside and facing the plurality of blades, the bevel having a top end at a level equal to or greater than a level of each top edge of the plurality of blades.

11. An electric abrasive tool machine according to claim 1 or 2, wherein the air passing hole is arc-shaped.

12. The power abrasive tool of claim 11, wherein the air vent is disposed along an edge of a motor housing disposed on the handle body.

13. The power abrasive tool of claim 12, wherein said power abrasive tool has a plurality of said air passing holes, said plurality of said air passing holes being of the same pattern and spaced apart.