CN212399150U

CN212399150U - Electric grinding machine tool

Info

Publication number: CN212399150U
Application number: CN202021737954.8U
Authority: CN
Inventors: 陈邦和
Original assignee: Ding Peng Enterprise Co ltd
Current assignee: Ding Peng Enterprise Co ltd; Xpole Precision Tools Inc
Priority date: 2020-08-19
Filing date: 2020-08-19
Publication date: 2021-01-26
Anticipated expiration: 2030-08-19

Abstract

An electric grinding machine tool comprises a holding body, a grinding disc and a battery, wherein a tool shaft connected with the grinding disc, a driving assembly capable of rotating the tool shaft when receiving electric power and a circuit board electrically connected with the driving assembly and the battery are arranged in the holding body, and the holding body is provided with a battery mounting seat exposed on the outer surface. The surface of the circuit board is not vertical to the tool shaft, the circuit board and the battery mounting seat are respectively positioned on two opposite sides of the tool shaft, and a connecting line of the circuit board and the battery mounting seat penetrates through the tool shaft. The utility model discloses see through and change this circuit board position, make this height that grips the body descend and then reduce the focus that should grip the body to increase the stability of grinding the operation.

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 with a grip body for reducing the center of gravity of the grip body.

Background

US 2020230796A, US 2006068689a and US 2018056473a disclose arrangements of internal components of power abrasive tools. As illustrated in fig. 1, the electric grinding machine tool 50 includes a holding body 51, a grinding disc 52 and a battery 53, wherein the holding body 51 has a tool shaft 511 disposed in the holding body 51 and connected to the grinding disc 52, a driving assembly 512 disposed in the holding body 51 and driving the tool shaft 511 when receiving power, and a circuit board 513 disposed in the holding body 51 and connected to the driving assembly 512 and the battery 53. In the prior art, the circuit board 513 is disposed at the top end (as indicated by reference numeral 515) of the tool shaft 511, so that the internal components of the electric grinding machine tool 50 are configured in a linear manner. That is, the height 514 of the holding body 51 is equal to the sum of the height of the circuit board 513, the height of the tool shaft 511 and the height of the top of the holding body 51. However, the conventional arrangement is disadvantageous in that the height 514 of the conventional grip body 51 is high, so that the center of gravity of the grip body 51 cannot be lowered, and the grip body 51 is easily unstable and topples over when the user operates and moves the electric grinding machine tool 50. Particularly, when the user operates the conventional electric grinding machine tool 50 to grind the vertical plate surface, the electric grinding machine tool 50 is more difficult to be stably controlled.

On the other hand, since the circuit board 513 is disposed at the top end of the tool shaft 511, that is, the circuit board 513 is disposed on a side of the holding body 51 close to the palm of the user. When the electric grinding machine tool 50 is in operation, the circuit board 513 receives electric power to generate heat energy, so that the temperature of the holding body 51 near the palm of the user is raised. When the electric grinding machine tool 50 is used for a long time, the circuit board 513 transmits a large amount of heat energy to the holding body 51, which makes it difficult for the user to hold the holding body 51, thereby affecting the grinding operation.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a main aim at solves current electronic grinding tool machine circuit board and locates instrument axle top, causes to grip the derived problem of body focus height on the high side.

The utility model discloses a another purpose, after solving current circuit board and accept electric power and produce heat energy, cause to grip the body temperature and rise, and then influence the user and grip the problem of gripping the body comfort level.

To achieve the above object, the present invention provides an electric grinding machine tool, which comprises a holding body, a grinding disc and a battery, wherein the holding body is provided with a tool shaft connected to the grinding disc, a driving assembly capable of rotating the tool shaft when receiving electric power, a circuit board electrically connected to the driving assembly and the battery, and the holding body has a battery mounting seat exposed on the surface. Furthermore, the surface of the circuit board is not perpendicular to the tool shaft, the circuit board and the battery mounting base are respectively positioned on two opposite sides of the tool shaft, and a connecting line of the circuit board and the battery mounting base passes through the tool shaft.

In one embodiment, the holding body is formed with a plurality of vent holes that form an air path through the circuit board.

In one embodiment, the holding body is formed with a plurality of vent holes, and the vent holes form a first air path passing through the circuit board and a second air path flowing at a side of the driving assembly not facing the circuit board.

In one embodiment, the driving assembly includes a rotor coupled to the tool shaft and a stator cooperating with the rotor.

In one embodiment, the electric grinding machine tool comprises an assembling shell which is arranged in the holding body and is provided with the driving assembly, and the assembling shell comprises a pipe body and two sealing covers which are respectively arranged on two sides of the pipe body.

In one embodiment, the tool shaft is provided with a balance weight body and a fan blade which is assembled on the balance weight body and rotates synchronously with the tool shaft.

In one embodiment, the counterweight body has a first counterweight portion and a second counterweight portion disposed vertically, the second counterweight portion is eccentric with respect to the first counterweight portion, and the fan blade is disposed on the second counterweight portion.

In one embodiment, the holding body is formed with at least one opening facing the weight body near one end of the grinding disc.

In one embodiment, the holding body defines a side of the circuit board as a front side, and the electric grinding machine tool has an operation panel disposed on the front side of the holding body and electrically connected to the circuit board.

In one embodiment, the holding body has a holding space facing the driving assembly and providing the circuit board on an inner wall surface.

In one embodiment, the holding body is formed with a protrusion corresponding to the outer surface of the holding space, and the protrusion provides a commercial mark thereon.

In one embodiment, the battery mounting base has an insertion opening, and the insertion opening is perpendicular to the tool shaft.

In one embodiment, the battery mounting base has an insertion opening, and the direction of the insertion opening is parallel to the tool shaft.

See through the utility model discloses aforementioned take off, compare in prior art and have following characteristics: the utility model discloses see through and change this circuit board position, make this circuit board set up in this instrument axle not facing the other side of this battery mount pad, the face of this circuit board is set for simultaneously and is not perpendicular to this instrument axle relatively. Therefore, the utility model discloses the height that should grip the body is about the height of this instrument axle, with the total of this body top height that grips, compare in prior art should grip the height of body for low, and then can reduce this body that grips's focus, make the user must more stably operate this body that grips. On the other hand, because the utility model discloses this circuit board no longer sets up in this instrument axle not facing this abrasive disc one side, makes the user not influence the user operation because of the circuit board temperature promotes when snatching this body of gripping.

Drawings

FIG. 1 is a schematic cross-sectional view of a conventional power grinding machine tool;

fig. 2 is a schematic perspective view of an embodiment of the present invention;

fig. 3 is an exploded view of an embodiment of the present invention;

fig. 4 is a schematic cross-sectional view (a) of an embodiment of the present invention;

fig. 5 is a schematic cross-sectional view of an embodiment of the present invention (ii);

FIG. 6 is a schematic diagram of the elements of an embodiment of the present invention;

fig. 7 is a schematic perspective view of another embodiment of the present invention;

fig. 8 is a schematic cross-sectional view of another embodiment of the present invention.

[ notation ] to show

10: electric grinding machine tool

11: holding body

101: height

111: head part

112: neck part

113: shoulder part

114: tool shaft

115: drive assembly

116: circuit board

117: counterweight body

118: a first weight part

119: second counter weight

120: direction of extension

121: battery mounting seat

122: connecting wire

123: vent hole

124: first air path

125: opening holes

126: fan blade

127: the second gas path

132: rotor

133: stator

134: assembling and connecting column

135: first bearing of the bearing

136: second bearing

137: front side

138: put into the opening

139: conductive terminal

140: direction of rotation

141: direction of extension of the shaft lever

142: direction of rotation

143: bearing space

144: convex part

15: grinding disc

151: body

152: assembly parts

16: battery with a battery cell

161: boss

162: conductive hole

17: assembling shell

171: pipe body

172: sealing cover

173: assembling piece

18: operation panel

181: control signal

50: electric grinding machine tool

51: holding body

511: tool shaft

512: drive assembly

513: circuit board

514: height

515: tool shaft top end

52: grinding disc

53: battery with a battery cell

Detailed Description

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

referring to fig. 2 to 5, the present invention provides an electric grinding machine tool 10, wherein the electric grinding machine tool 10 includes a holding body 11, a grinding plate 15 and a battery 16. In one embodiment, the holding body 11 includes a head 111, a neck 112, and a shoulder 113, the head 111 is held by a user to control the holding body 11. The neck 112 extends from one side of the head 111, and the diameter of the neck 112 is smaller than the diameter of the head 111 and smaller than the diameter of the shoulder 113. In addition, the shoulder 113 is connected to the neck 112 and extends toward the direction that the neck 112 does not face the head 111, and the diameter of the shoulder 113 increases from the side of the shoulder 113 facing the neck 112 to the side of the shoulder 113 away from the neck 112, so that the shoulder 113 is flared. The side of the shoulder 113 not connected to the neck 112 is disposed facing the polishing disk 15, and the diameter of the shoulder 113 away from the neck 112 is corresponding to the diameter of the polishing disk 15.

Further, the grip body 11 further includes a tool shaft 114, a driving element 115, and a circuit board 116. Specifically, the tool shaft 114 is disposed in the holding body 11, and one end of the tool shaft 114 is assembled with the polishing disc 15. In one embodiment, the polishing disk 15 includes a main body 151 and an assembly 152 connected to the main body 151, wherein the tool shaft 114 is connected to the assembly 152. In addition, in one embodiment, the tool shaft 114 is connected to a counterweight 117 facing the polishing disc 15, the counterweight 117 has a first counterweight 118 and a second counterweight 119 disposed vertically, the second counterweight 119 is disposed below the first counterweight 118, and the second counterweight 119 is eccentric with respect to the first counterweight 118, so that the tool shaft 114 can drive the polishing disc 15 to generate an eccentric rotation stroke through the arrangement of the counterweight 117. On the other hand, the driving element 115 is assembled with the tool shaft 114 and located in the holding body 11, the driving element 115 may be an electric motor, and the driving element 115 receives electric power to drive the tool shaft 114 to rotate. The circuit board 116 and the driving element 115 are electrically connected to the battery 16, and the circuit board 116 is used for controlling the operation of the driving element 115. In this embodiment, the circuit board 116 can be fixed on the inner wall surface of the holding body 11, so that the circuit board 116 can be disposed on the neck portion 112 of the holding body 11. In more detail, the circuit board 116 has an extending direction 120 along a board surface, the board surface is a plane on which the electronic components are disposed on the circuit board 116, and the extending direction 120 of the circuit board 116 is not perpendicular to the tool axis 114. In one embodiment, the extending direction 120 of the circuit board 116 and the tool shaft 114 can be disposed in parallel to reduce the height of the holding body 11. On the other hand, the grip body 11 has a battery mounting seat 121 exposed on the surface, the battery mounting seat 121 is used for assembling the battery 16, so that the power of the battery 16 can be transmitted to the circuit board 116 through the battery mounting seat 121. The battery mounting seat 121 is disposed on a side of the tool shaft 114 not facing the circuit board 116, that is, the battery mounting seat 121 and the circuit board 116 are respectively disposed on two opposite sides of the tool shaft 114, so that a connection line 122 between the circuit board 116 and the battery mounting seat 121 passes through the tool shaft 114.

Accordingly, the present invention changes the position of the circuit board 116 to make the height 101 of the holding body 11 less than the height of the circuit board 116, and approximately equal to the sum of the height of the tool shaft 114 and the height of the top of the holding body 11, so as to reduce the height 101 of the holding body 11 and achieve the purpose of reducing the center of gravity of the holding body 11. Through the utility model discloses, the user is when operating this electronic grinding machine tool 10, because of should gripping the focus decline of body 11 for should gripping body 11 and be difficult for producing when the displacement topples over and can be more stable press close to the grinding surface when receiving the operation. Especially, when the user grinds the upright board, the user does not need to spend a great deal of force to control the holding body against the action of gravity, so that the holding body 11 is close to the board, and the grinding quality of the electric grinding machine tool 10 can be improved conveniently for the user to operate. Furthermore, because the circuit board 116 of the present invention is no longer disposed on the head 111 of the holding body 11, the user can hold the head 111 without being affected by the temperature of the circuit board 116, thereby facilitating the operation of the user.

In view of the above, referring to fig. 2 to 5, in one embodiment, in order to improve the heat dissipation effect of the circuit board 116, the holding body 11 forms a plurality of vent holes 123, the vent holes 123 are located between the driving assembly 115 and the circuit board 116, and the vent holes 123 form a first air path 124 for exchanging heat with the circuit board 116 when the air flow inside the electric grinding machine tool 10 changes. For example, the ventilation holes 123 may be disposed on two opposite sides of the holding body 11, and one of the ventilation holes 123 located on one side of the holding body 11 may allow external air to enter the holding body 11, pass through the circuit board 116 in parallel, and then be discharged from the other ventilation hole 123 located on the other side of the holding body 11, so that the circuit board 116 may dissipate heat. In yet another embodiment, the vent holes 123 may also be located between the driving element 115 and the battery mounting seat 121, so that the vent holes 123 may also form a second air path 127 passing through the driving element 115. For further example, the vent holes 123 may also be disposed on two opposite sides of the holding body 11, respectively, wherein one of the vent holes 123 located on one side of the holding body 11 is used for air to enter from the outside, and then the air flows to the side of the driving element 115 not facing the circuit board 116 and is exhausted through the other vent hole 123 located on the other side of the holding body 11. In this way, when the driving element 115 is driven to operate, the heat energy of the driving element 115 can be dissipated through the air from the second air path 127, thereby preventing the head 111 of the holding body 11 from being too hot to be held by a user, reducing the heat energy radiation of the driving element 115 to the circuit board 116, and reducing the problem that the circuit board 116 damages the service life and the stability of the circuit board 116 due to the accumulated heat. In addition, in the embodiment, when the battery 16 is inserted into the battery mounting seat 121, the air in the second air path 127 not only can dissipate heat from the driving component 115, but also can exchange heat with heat energy generated by the battery 16 when power is supplied. It should be noted that the airflow directions of the first air path 124 and the second air path 127 are only for illustration and are not intended to limit the present disclosure.

In addition, the tool shaft 114 has a fan blade 126 assembled on the counterweight body 117, and the fan blade 126 is disposed on the second counterweight portion 119 and driven by the tool shaft 114, so that the fan blade 126 and the tool shaft 114 rotate synchronously. In another embodiment, the holding body 11 is formed with at least one opening 125 near one end of the polishing disc 15, which respectively faces the weight body 117, and the opening 125 allows air to enter the holding body 11 from the outside.

On the other hand, referring to fig. 2 to 5, in an embodiment, the driving element 115 includes a rotor 132 and a stator 133, wherein the rotor 132 is connected to the tool shaft 114, and the rotor 132 starts to rotate after being acted by a magnetic force, so as to drive the tool shaft 114 to rotate therewith. In addition, the stator 133 is disposed at the periphery of the rotor 132 and is implemented in cooperation with the rotor 132. The specific structure of the stator 133 and the matching manner of the stator 133 and the rotor 132 are well known in the art, and are not described herein.

Further, the power grinding machine tool 10 includes an assembling housing 17 for disposing the driving element 115 therein, the assembling housing 17 is disposed in the holding body 11, and the assembling housing 17 includes a tube 171 and two covers 172 respectively disposed on two sides of the tube 171. More specifically, the tube 171 is disposed between the stator 133 and the rotor 132, and in one embodiment, the tube 171 is fixed to the stator 133. In another embodiment, the stator 133 is formed with at least one set of posts 134, and the set of posts 134 is assembled with one of the covers 172, so that the stator 133 can be fixed in the tube 171. In addition, the two covers 172 are used to seal the tube 171, thereby preventing the dust generated during the grinding process of the electric grinding machine tool 10 from entering the driving element 115. In one embodiment, each of the covers 172 includes at least one connecting member 173, and the connecting member 173 can fix the cover 172 and the tube 171 by screwing. In another embodiment, the driving element 115 comprises at least one first bearing 135 disposed on the tool shaft 114, the first bearing 135 can be disposed on a side of the tool shaft 114 facing one of the covers 172, and the first bearing 135 is used to reduce a friction force generated when the tool shaft 114 rotates. On the other hand, in one embodiment, at least one second bearing 136 may be disposed on the weight body 117, and the second bearing 136 assists the weight body 117 to reduce the friction force when the tool shaft 114 rotates.

In another aspect, referring to fig. 3 to 6, in an embodiment, the holding body 11 defines a side of the circuit board 116 as a front side 137, the electric grinding machine tool 10 has an operation panel 18 disposed on the front side 137 of the holding body 11, the operation panel 18 is electrically connected to the circuit board 116, the operation panel 18 generates a control signal 181 to the circuit board 116 after being operated, and the circuit board 116 controls the driving element 115 to start or stop operating according to the content of the control signal 181.

Furthermore, the battery mounting seat 121 of the present invention has an insertion opening 138 and two conductive terminals 139 disposed in the insertion opening 138, the battery 16 is formed with a protruding boss 161 facing the battery mounting seat 121 and a plurality of conductive holes 162 disposed on the boss 161, and the two conductive terminals 139 are inserted into two of the conductive holes 162. Further, the insertion opening 138 is defined by an assembling direction of the battery 16, and as shown in fig. 3, the direction (e.g., 140) of the insertion opening 138 is perpendicular to the shaft extending direction (e.g., 141) of the tool shaft 114, i.e., the battery 16 is assembled on the battery mounting seat 121 in a transverse inserting manner.

In another embodiment, the direction of the insertion opening 138 (e.g., 142) may be parallel to the shaft extension direction of the tool shaft 114 (e.g., 141). As shown in FIG. 7, the battery 16 is assembled to the battery mounting seat 121 in a straight-plug manner. Referring to fig. 8, in an embodiment, the holding body 11 of the present invention has a holding space 143 facing the driving component 115 on an inner wall surface, the holding space 143 is disposed on the front side 137 and located at the neck 112, and the holding space 143 is used for the circuit board 116 to be disposed therein. In one embodiment, the holding body 11 is formed with a protrusion 144 on the outer surface corresponding to the receiving space 143, and the protrusion 144 can provide a commercial label (not shown) thereon, wherein the commercial label can be a trademark or a product model.

Claims

1. The utility model provides an electronic grinding machine tool, contains one and grips the body, a grinding disk and a battery, should grip this internal instrument axle of being equipped with a connection this grinding disk of this, can make this instrument axle pivoted drive assembly when accepting electric power, the circuit board of this drive assembly of an electric connection and this battery, should grip the body and have one and show in apparent battery mount pad, this electronic grinding machine tool characterized in that:

the surface of the circuit board is not vertical relative to the tool shaft, the circuit board and the battery mounting seat are respectively positioned at two opposite sides of the tool shaft, and a connecting line of the circuit board and the battery mounting seat passes through the tool shaft.

2. The power abrasive tool of claim 1, wherein the gripping body defines a plurality of vent holes, the vent holes defining an air path through the circuit board.

3. The power abrasive tool machine of claim 1, wherein the gripping body defines a plurality of vent holes therein, the vent holes defining a first air path through the circuit board and a second air path through the drive assembly on a side of the circuit board not facing the circuit board.

4. The power milling tool of any one of claims 1 to 3, wherein the drive assembly includes a rotor coupled to the tool shaft and a stator implemented in cooperation with the rotor.

5. The power abrasive machine tool of claim 4, comprising an assembly housing disposed within the grip body and providing the drive assembly therein, the assembly housing comprising a tube and two covers disposed on opposite sides of the tube.

6. The power grinder tool of any one of claims 1-3, wherein the tool shaft has a counterweight and a blade mounted on the counterweight and rotating synchronously with the tool shaft.

7. The power milling machine tool of claim 6, wherein the weight body has a first weight portion and a second weight portion vertically disposed, the second weight portion being eccentric with respect to the first weight portion, the blade being disposed on the second weight portion.

8. The power abrasive tool machine of claim 7, wherein the holding body is formed with at least one opening respectively facing the weight body near an end of the abrasive disk.

9. The power abrasive tool machine of claim 6, wherein the holding body is formed with at least one opening respectively facing the weight body near one end of the polishing pad.

10. The power grinding machine tool of claim 9, wherein the grip body defines a side of the circuit board as a front side, the power grinding machine tool having an operating panel disposed on the front side of the grip body and electrically connected to the circuit board.

11. The power milling machine tool of any one of claims 1 to 3, wherein the grip body has a receiving space on an inner wall surface facing the driving assembly and providing the circuit board.

12. The power abrasive tool of claim 11, wherein the gripping body is formed with a protrusion on an exterior surface thereof opposite the receiving space, the protrusion providing a commercial indicator thereon.

13. The power abrasive tool of any one of claims 1-3, wherein the battery mount has an insertion opening oriented perpendicular to the tool axis.

14. The power abrasive tool of any one of claims 1-3, wherein the battery mount has a receiving opening oriented parallel to the tool axis.

15. The power grinding machine tool of any one of claims 1-3, wherein the grip body defines a side of the circuit board as a front side, the power grinding machine tool having an operating panel disposed on the front side of the grip body and electrically connected to the circuit board.