CN118046291A - Electric grinding tool machine - Google Patents

Abstract

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

Description

Electric grinding tool machine

Technical Field

The present invention relates to an electric grinding machine, and more particularly, to an electric grinding machine capable of effectively discharging heat accumulated in a motor without an active dust suction structure.

Background

In the prior art, an air flow generating member is attached to an eccentric block of the electric grinding machine tool to generate heat dissipation air flow through the air flow generating member, so as to discharge 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 solution disclosed in fig. 1, a polishing disc mask 61 of the electric polishing tool machine 60 is provided with a plurality of ventilation holes 611, and the airflow generating member 62 is disposed adjacent to the ventilation holes 611 and is also adjacent to a port where the polishing disc mask 61 is connected to a holding body 63. Ideally, when the wind flow generating member 62 rotates, the wind flow generating member 62 will draw in the air through the air holes 611 to dissipate heat, but the air holes 611 cannot actually generate the desired effect due to the spaced arrangement of the air holes 611 and the excessive proximity of the wind flow generating member 62 to the air holes 611. When one of the ventilation holes 611 is air intake, the other one of the ventilation holes 611 is air-discharged, and a short flow problem (also called short cycle) is generated, as shown in fig. 2, such that the air intake efficiency of the ventilation holes 611 is not in line with the expectation, and the short flow problem further causes the heat dissipation effect of the air flow generating member 62 to be limited to the eccentric block, and the eccentric block can lead out waste heat due to the connection with the electric motor 64, but the shaft diameter of a shaft connected with the electric motor 64 of the eccentric block is generally smaller, and the waste heat transfer speed is lower than the heat generated by the electric motor 64, so that the waste heat is accumulated continuously and affects the feeling of a user when the user holds the air flow generating member.

In addition, although some embodiments have a plurality of air inlet holes 631 formed on the holding body 63, the air flow generating member 62 rotates to draw the external air into the air inlet holes 631 to form a heat dissipation air flow, the air flow generating member 62 has a problem of poor air inlet efficiency, and cannot generate a suction force according with requirements, so that the heat dissipation air flow passes through the electric motor 64, but the heat dissipation of the electric motor 64 is limited due to insufficient air volume of the air flow generating member 62, and the waste heat accumulation problem of the electric motor 64 is still serious.

The only current implementation to solve the above-mentioned problems is to implement an electric abrasive machine tool 70 with an active dust suction structure 71, as disclosed in fig. 3 or EP2946710B 1. In fig. 3, the air inlet of the active dust suction structure 71 is an air inlet 721 formed on a polishing disc mask 72, and when the active dust suction structure 71 is implemented, a suction force is generated in the space of the polishing disc mask 72, the suction force is significantly greater than the suction force generated by the airflow generating member 73, and a large amount of air is sucked through a plurality of air inlets 741 formed on a holding body 74, so that a large amount of air sucked from the air inlets 741 is greatly helpful for heat dissipation of an electric motor 75.

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

Disclosure of Invention

The invention mainly aims to solve the problem that the electric accumulated heat is not easy to discharge when the existing electric grinding tool machine is not provided with an active dust collection structure.

The invention aims to solve the problem that the existing electric grinding tool machine aims at the design of a wind flow generating piece and a corresponding structure to cause poor heat dissipation wind flow efficiency.

In order to achieve the above object, the present invention provides an electric polishing tool machine, which has an electric motor, a holding body provided with the electric motor, a shade connected to the holding body, an eccentric block located in the shade and driven by the electric motor, and a wind current generating member hung on the eccentric block. The holding body and the shade are provided with at least one air passing hole, the air passing hole is provided with a first distance relative to the axis of the electric motor, the shade is not provided with 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 in a circle, 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 the longitudinal length of each fan blade, the third distance is at least 50% of the radial length of each fan blade, the outer diameter of the air flow generating piece is larger than the first distance.

In one embodiment, the eccentric block 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 the first portion axis, the wind flow generating member being attached to the second portion.

In one embodiment, the wind flow generating member has a bottom edge with a level corresponding to the level of the bottom edge of the eccentric mass.

In one embodiment, the airflow generating member has an opening formed in the base plate and at least two hooks formed at edges of the opening.

In an embodiment, the plurality of fan blades are not disposed on a side of the bottom plate facing a polishing disc.

In one embodiment, the shroud is gradually separated from the wind flow generating member 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 generating member and the shroud, and the fourth distance is greater than the radial length of each of the plurality of blades.

In one embodiment, the shroud has a bevel on the inner side facing the plurality of blades, the bevel having a top level equal to or higher than the level of each top edge of the plurality of blades.

In one embodiment, the grip body has a skirt providing the masking assembly, the skirt having an inner edge that is non-planar.

In one embodiment, the gas passing holes are arc-shaped.

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

In one embodiment, the electric polishing tool has a plurality of air passing holes, and the air passing holes are identical in form and are arranged at intervals.

Compared with the prior art, the invention has the following characteristics: according to the electric grinding tool machine, the shade does not need to be provided with any vent holes for entering air from the side of the shade, the space formed between the air flow generating piece and the holding body and the range of the inner ring of the air flow generating piece enable air flow discharged from the air passing holes to flow briefly, and then the air flow is smoothly guided by the air flow generating piece and is discharged from the position between the shade and the grinding disc. The wind flow generating piece is arranged, so that the electric grinding tool machine can greatly improve the heat accumulation problem of the electric motor existing in the prior design without excessively changing the basic design of the electric grinding tool machine and without installing an active dust collection structure, and greatly increase the comfort level of the palm of a user during long-term holding and use.

Drawings

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

FIG. 2 is a schematic view of the wind flow of a conventional electric abrasive machine wind flow generator;

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

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

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

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

FIG. 7 is a schematic top view of a partial structure of the electric abrasive machine of the present invention;

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

FIG. 9 is a schematic view of the heat dissipation airflow inside the electric abrasive tool machine of the present invention;

FIG. 10 is a schematic view of the heat dissipation airflow inside the electric abrasive tool machine (II) according to the present invention;

FIG. 11 is a schematic view of the structure of the wind flow generating member attached with the eccentric block according to the present invention.

[ Symbolic description ]

20: Electric grinding tool machine

21: Electric motor

22: Holding body

221: Shell member

222: Outer casing

223: Motor outer cover

224: Channel

225: Operation pressing plate

226: Control module

227: Air inlet hole

228: Air passing hole

229: Joint plate

230: Skirt edge

231: Continuous concave-convex structure

232: Baffle plate

233: Tail section area

234: Head section area

24: Mask cover

241: Assembling port

242: Release port

243: Inclined plane

244: Top end

25: Eccentric block

251: First part

252: Second part

26: Wind current generating piece

261: Bottom plate

262: Fan blade

263: Inner ring

264: Outer ring

265: An opening

266: Hook

267: Ring wall

27: Grinding disc

30: First distance

31: Second distance

32: Third distance

33: Fourth distance

40: Radiating airflow

50: Temporary wind flow storage area

60: Electric grinding tool machine

61: Abrasive disk mask

611: Air inlet hole

62: Wind current generating piece

63: Holding body

631: Air inlet hole

64: Electric motor

70: Electric grinding tool machine

71: Active dust collection structure

72: Dust disk shade

721: Suction inlet

73: Wind current generating piece

74: Holding body

741: Air inlet

75: Electric motor

80: Palm center measuring point

81: Finger-holding measuring point

Detailed Description

The detailed description and the technical content of the invention are now as follows in conjunction with the accompanying drawings:

Referring to fig. 4 to 6, the present invention provides an electric polishing tool 20, wherein the electric polishing tool 20 comprises an electric motor 21, a holding body 22 provided with the electric motor 21, a shade 24 connected with the holding body 22, an eccentric block 25 positioned in the shade 24 and driven by the electric motor 21, and a wind current generating member 26 hung on the eccentric block 25. The electric motor 21 may be of an inner rotary type or an outer rotary type. In addition, the holding body 22 may be composed of a plurality of shells 221, one of the shells 221 may be a part of a housing 222, and one of the shells 221 may be a part of the housing 222, and a motor housing 223 may be formed, where the motor housing 223 is located in a space defined by the shells 221 when the shells 221 are assembled, that is, in the holding body 22. The present invention uses the area between the motor housing 223 and the housing 222 as a channel 224 for providing gas flow. The holding body 22 is provided with an operation pressing plate 225 and a control module 226 matched with the operation pressing plate 225 in addition to the electric motor 21. The holding body 22 is further provided with a plurality of air intake holes 227, and the air intake holes 227 introduce external air when the wind current generating member 26 is started. In one embodiment, at least one of the air intake holes 227 is disposed corresponding to the control module 226. In addition, the mask 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 mask 24 is assembled, and the releasing opening 242 faces a polishing disc 27 mounted on the eccentric block 25.

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

Referring back to fig. 9, the airflow generating member 26 of the present invention rotates with the eccentric block 25, and when the airflow generating member 26 rotates, at least one heat dissipating airflow 40 is generated in the electric polishing tool 20, and the heat dissipating airflow 40 uses the air inlet 227 as a starting point, dissipates heat of the electric motor 21 through the channel 224, and sequentially passes through the air passing hole 228 and the airflow generating member 26 (as shown in fig. 10) and is discharged from the release opening 242 of the mask 24. Referring back to fig. 10, in the present invention, when the heat dissipating air flow 40 passes through the air passing hole 228, it first enters the space between the air flow generating member 26 and the holding body 22 and the inner ring 263 of the air flow generating member 26, and is then guided and discharged by the fan blades 262. The space between the wind flow generating member 26 and the holding body 22 and the range of the inner ring 263 of the wind flow generating member 26 can be referred to as a wind flow temporary storage area 50, and the wind flow temporary storage area 50 enables the heat dissipation wind flow 40 to be smoothly guided, so that the electric polishing tool 20 of the present invention can generate a large wind flow to dissipate heat in the holding body 22 without the active dust collection structure, thereby particularly improving the problem of difficult heat accumulation and discharge of the electric motor 21 and greatly increasing the comfort of the user in holding for a long time. Referring to the first and second tables, the first table is a temperature rise comparison table of the electric polishing machine tool of the present invention (the present invention is replaced by the table), the conventional electric polishing machine tool without the active dust suction structure and with the mask having the vent hole (the conventional dust suction is replaced by the table), and the electric polishing machine tool with the active dust suction structure (the conventional dust suction is replaced by the table). The temperature measurement points are the palm positions (80 as marked in fig. 4) when the user grasps, and the set conditions are 180W load, sand paper #80, and 6 inches abrasive disc. The basic conditions of Table II are the same as those of Table I, except that the temperature measurement point is the user's finger grip (81 as indicated in FIG. 4).

List one

Watch II

From the first and second tables, it can be understood that when the conventional cleaner is operated for 15 minutes, the temperatures of the palm measuring point and the finger holding measuring point are obviously raised, and the palm measuring point and the finger holding measuring point on the outer surface of the machine tool are so high that the waste heat accumulation temperature of the electric motor in the machine tool is higher, which highlights the problems that the accumulated heat of the electric motor and the conventional wind flow generating member cannot really play a role in the prior art. Comparing the temperature of the invention with the temperature of the prior dust collector in the running time of a plurality of tool machines, the temperature of the palm measuring point and the finger holding measuring point can be compared with the performance of the prior dust collector under the condition that the active dust collection structure is not installed, and the performance of the finger holding measuring point (table two) is obviously better than that of the prior dust collector. Accordingly, the present invention does not solve the problem of heat accumulation of the electric motor in the conventional structure.

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

Referring back to fig. 8 and 11, in one embodiment, the airflow generating member 26 has an opening 265 formed on the bottom plate 261, and at least two hooks 266 formed on the edge of the opening 265. The two hooks 266 are disposed opposite to each other to be fixed on the eccentric block 25. In addition to the foregoing, the wind flow generating member 26 further has an annular wall 267 surrounding the opening 265. In one embodiment, the blades 262 are not disposed on a side of the base 261 facing the polishing plate 27. That is, the wind flow generating member 26 does not have any fan blades on the side of the bottom plate 261 facing the polishing plate 27.

Referring back to fig. 6, in one embodiment, the shroud 24 is gradually separated from the airflow generating member 26 from the top edge of each of the blades 262 toward the bottom edge of each of the blades 262, that is, the shroud 24 is in a horn shape. Further, a fourth distance 33 is provided between the outer bottom edge of the wind flow generating member 26 and the shroud 24, and the fourth distance 33 is greater than the radial length of each of the blades 262. In one embodiment, the mask 24 has an inclined surface 243 on the inner side facing the blades 262, and the top (244 as shown) of the inclined surface 243 is at the same level or higher than the top edge of each blade 262.

Referring back to fig. 5 and 6, in one embodiment, the holding body 22 has a skirt 230 for providing the assembling of the mask 24, and a continuous concave-convex structure 231 is formed on the outer surface of the skirt 230, and the continuous concave-convex structure 231 provides the assembling opening 241 of the mask 24 to be sleeved on. Further, the inner edge of the skirt 230 may be a continuous arc surface 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 back to fig. 7, in one embodiment, the air passing hole 228 is arc-shaped in a top view, and the air passing hole 228 is disposed along an edge of the motor housing 223. Further, when the electric polishing tool 20 has a plurality of air holes 228, the air holes 228 are identical in shape and are arranged at intervals. In one embodiment, the motor housing 223 is formed with baffles 232 formed on opposite sides of the motor housing 223, the baffles 232 being positioned within the channel 224. The two baffles 232 force the cooling airflow 40 to be directed to the top edge of the motor housing 223 (as shown in fig. 9) and then to flow toward the air passing holes 228 (as shown in fig. 10), thereby reducing the temperature rise of the grip body 22 in the grip portion of the user's palm. Furthermore, if the two baffles 232 are used to divide the internal space of the holding body 22 into a tail section area 233 provided with the control module 226 and a head section area 234, in this embodiment, the air inlet 227 opened on the holding body 22 is located in the tail section area 233, and the air inlet 227 may be distributed in the tail section area 233 when implemented in multiple ways, for example, one of the air inlets 227 may face the control module 226, and another of the air inlets 227 may face the motor housing 223 directly.

Claims (13)

1. An electric grinding machine tool having an electric motor, a holding body provided with the electric motor, a shade connected with the holding body, an eccentric block positioned in the shade and driven by the electric motor, and a wind flow generating member hung on the eccentric block, the electric grinding machine tool is characterized in that:

the holding body is provided with at least one air passing hole, the air passing hole is provided with a first distance relative to the axis of the electric motor, the shade is not provided with 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 in a circle, 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 the longitudinal length of each fan blade, the third distance is at least 50% of the radial length of each fan blade, and the outer diameter of the air flow generating piece is larger than the first distance.

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

3. The electric abrasive tool machine of claim 1 or 2, wherein the wind flow generating member bottom edge has a level that matches the level of the eccentric mass bottom edge.

4. The electric abrasive tool machine of claim 3, wherein the wind flow generating member has an opening formed in the base plate and at least two hooks formed on edges of the opening.

5. The electric power tool of claim 4, wherein the plurality of blades are not disposed on a side of the base plate facing an abrasive disk.

6. The electric abrasive tool machine of claim 1 or 2, wherein the shroud is progressively farther from the wind flow generator from a top edge of each of the plurality of blades toward a bottom edge of each of the plurality of blades, the wind flow generator having a fourth distance from the outer bottom edge of the wind flow generator to the shroud, the fourth distance being greater than a radial length of each of the plurality of blades.

7. The electric power tool of claim 6, wherein the shroud has an inner bevel facing the plurality of blades, the bevel having a top level equal to or higher than the level of each top edge of the plurality of blades.

8. The power tool of claim 1 or 2, wherein the grip body has a skirt providing the shroud assembly, the skirt having an inner edge that is non-planar.

9. The electric power tool of claim 8, wherein the shroud is spaced progressively away from the wind flow generating member from a top edge of each of the plurality of blades toward a bottom edge of each of the plurality of blades, the wind flow generating member having a fourth distance from the outer bottom edge of the wind flow generating member that is greater than a radial length of each of the plurality of blades.

10. The electric power tool of claim 8, wherein the shroud has an inner bevel facing the plurality of blades, the bevel having a top level equal to or higher than the level of each top edge of the plurality of blades.

11. The electric abrasive tool machine of claim 1 or 2, wherein the gas passing holes are arc-shaped.

12. The electric power tool of claim 11, wherein the vent is located along an edge of a motor housing provided to the grip body.

13. The power tool of claim 12, wherein the power tool has a plurality of the air holes, the plurality of air holes being identical in configuration and spaced apart.