CN214393694U - Grinding machine tool for reducing hair scald of machine shell - Google Patents

Abstract

A grinding machine tool for reducing the scalding of a machine shell comprises a machine shell and a driving assembly, wherein the machine shell is divided into a head part and a body part, the machine shell comprises a plurality of shell pieces, the machine shell is provided with an air inlet arranged on the body part and an air outlet arranged on one side, far away from the body part, of the head part, a motor cover body is formed on the head part of the machine shell, and the motor cover body is not in contact with the shell pieces to enable the machine shell to form an air flow channel. The driving assembly comprises a circuit board arranged on the shell, a motor arranged in the motor cover body, an airflow generating piece rotating synchronously with the motor, a first heat dissipation airflow which is generated by the airflow generating piece and radiates heat to the circuit board and the head through the airflow channel when the airflow generating piece rotates, and a second heat dissipation airflow which is formed by radiating heat on one side of the motor facing the airflow generating piece.

Description

Grinding machine tool for reducing hair scald of machine shell

Technical Field

The present invention relates to a grinding machine tool for reducing the burning of a machine case, and more particularly to a grinding machine tool for reducing the burning of a machine case by circulating a heat dissipating air flow in the machine case.

Background

In the conventional grinding machine tool, a fan is disposed on one side of the motor, and the fan rotates along with an output shaft and outputs an air flow toward the motor. However, the conventional wind flow can only flow toward the side of the motor facing the fan, so that the conventional side of the motor not facing the fan cannot obtain heat dissipation, which causes uneven heat dissipation of the motor and continuous accumulation and transmission of heat energy on the motor to the motor housing.

Furthermore, the conventional motor is often disposed at a position corresponding to the user holding the grinding machine tool, and the conventional grinding machine tool usually uses the machine tool housing to seal the machine body for preventing dust from flowing into the machine tool, so that the air inside the machine tool cannot flow.

To solve the problem of the internal part of the grinding machine tool not being easy to dissipate heat, US patent No. US 7,270,598 discloses a conventional technology for dissipating heat from external air introduced into the internal part of the grinding machine tool by the grinding machine tool. Specifically, when the conventional grinding machine tool sucks dust-containing gas generated by grinding through the dust suction pipe, the gas pressure in the machine tool is changed, so that external air can enter the machine tool from the air inlet and enter the dust suction pipe, and the external air passes through the motor and radiates the motor in the process of flowing towards the dust suction pipe. However, in the conventional heat dissipation mechanism, the flowing direction of the external air flowing into the machine tool is different from the flowing direction of the dust-containing air flow, so that the external air and the dust-containing air flow are likely to interfere with each other to generate turbulence. Moreover, when the conventional dust suction pipe is used for sucking dust, dust suction airflow must enter the dust suction pipe through the space inside the machine tool, so that the grinding machine tool cannot prevent the dust in the dust suction airflow from flowing into the grinding machine tool, and dust is easily accumulated on the conventional motor and other electronic components to influence the operation of the components.

In order to solve the above problems, the patents CN 110270930a and US9,408,513B do not use a conventional heat dissipation mechanism for heat dissipation, that is, the grinding machine disclosed in the patents CN 110270930a and US9,408,513B do not have an air inlet for the external air to enter, but the grinding machine housing is made to seal the inside of the grinding machine to reduce the accumulation of dust. Further, patents CN 110270930a and US9,408,513B utilize a motor spaced from the grinding machine housing, thereby reducing the transfer of heat energy accumulated by the motor to the grinding machine housing. However, the grinding machine tools of CN 110270930a and US9,408,513B can only dissipate heat locally to the motor, so that the motor still has uneven heat dissipation, and the heat dissipation scheme without the motor contacting the grinding machine tool housing can only reduce the speed of heat transfer from the motor to the housing, and cannot specifically solve the problems of heat energy accumulation on the motor and heat transfer from the motor to the housing. Moreover, since the conventional fan cannot introduce external air into the interior of the machine tool, the fan can only drive the gas in the interior of the machine tool to form the wind flow, when the conventional grinding machine tool is used for a long time, the temperature of the gas in the interior of the machine tool is increased due to the heat accumulated on the motor and the circuit board in the grinding machine tool, and the wind flow generated by the fan is also increased so as not to provide good heat dissipation for the motor, so that the machine tool shell can still be scalded by the heat energy on the motor. In addition, since the conventional grinding machine tool is of a closed structure, external air cannot flow into the interior of the grinding machine tool to cool air inside the grinding machine tool, so that the temperature of the housing of the grinding machine tool is likely to rise due to the influence of the internal air, and the housing of the grinding machine tool is not easy to hold by a user.

SUMMERY OF THE UTILITY MODEL

The main objective of the present invention is to solve the problem of the conventional heat dissipation mechanism using external air to easily make dust enter the interior of the grinding machine tool.

Another object of the present invention is to solve the problem that the conventional grinding machine tool with a closed housing cannot reduce the occurrence of the hot working of the housing of the machine tool.

To achieve the above object, the present invention provides a grinding machine tool for reducing the scalding of a machine shell, comprising a machine shell and a driving assembly, wherein the machine shell is divided into a head and a body, the machine shell is composed of at least two shell members, the machine shell has an air inlet formed on the body and an air outlet formed on the head and away from one side of the body, the machine shell is provided with a motor cover body on the head, the motor cover body is open facing one end of a grinding member, and a gap is reserved between the motor cover body and the shell members to enable the machine shell to be formed and enter the air outlet through the air inlet. The driving assembly comprises a circuit board arranged in the shell, a motor which is arranged in the motor cover body and connected with the circuit board to drive the grinding piece to rotate, an airflow generating piece which shields one side of the motor cover body facing the grinding piece and synchronously rotates with the motor, a first heat dissipation airflow which can dissipate heat of the circuit board and the head of the shell through the airflow channel is generated in the shell when the airflow generating piece rotates, and a second heat dissipation airflow which can dissipate heat of one side of the motor facing the airflow generating piece.

In one embodiment, the grinding machine tool comprises a wind guide member disposed in the housing and located in the airflow channel, wherein the wind guide member has a wind receiving end and a wind outlet end higher than the wind receiving end.

In one embodiment, the motor cover body is in a cylindrical shape, and the air guide member forms a main guide surface and two auxiliary guide surfaces which are arranged on two sides of the main guide surface and have different flow guide directions from the main guide surface along the edge of the motor cover body.

In one embodiment, two sides of the air guide respectively extend into a gap between the side edge of the motor cover and the inner wall of the head, and a guide channel is formed, wherein an inlet of the guide channel is higher than an outlet of the guide channel.

In one embodiment, the flow guide member is located at the interface between the body portion and the head portion.

In one embodiment, the motor includes an output shaft and a bearing seat for the grinding member to be assembled and driven by the output shaft, and the airflow generating member includes a mounting seat assembled with the bearing seat, an end plate extending from the mounting seat, and a plurality of blades disposed on one side of the end plate facing the motor cover.

In one embodiment, the fan blades stand on the end plate.

In one embodiment, the bearing seat comprises two blocks arranged in a staggered mode, and the mounting seat is provided with an accommodating space which is matched with the two blocks in a forming mode.

In one embodiment, the mounting base is provided with at least two limiting arms for limiting the bearing base to be separated.

In one embodiment, the accommodating space penetrates through two ends of the mounting base, a limiting wall is disposed at one end of the mounting base away from the blades, and the limiting wall and the two limiting arms limit the bearing seat together.

In one embodiment, the abrasive machine tool includes an end cap disposed at an open end of the motor housing.

In one embodiment, the casing members are divided into a lower casing and an upper casing, the lower casing is assembled with the motor cover, and the upper casing does not contact the motor cover and forms the airflow channel together with the lower casing.

In one embodiment, the grinding machine tool comprises a dust-proof shield assembled with the housing and located at the head, and a dust-collecting tube arranged on the dust-proof shield.

In one embodiment, the circuit board is disposed on the body portion, the grinding machine tool comprises a heat sink disposed on the body portion and capable of dissipating heat from the circuit board, the lower housing member has a positioning groove for placing the heat sink therein, and the air inlet is formed in the positioning groove.

In one embodiment, the air inlet is formed by a plurality of strip-shaped holes.

See through the utility model discloses aforementioned take off, compare in the conventional art, the utility model has the following characteristics: the utility model discloses except that heat dissipation is carried out to this motor one side with the conventional heat dissipation mechanism, the utility model discloses after this casing equipment is accomplished, make between this motor cover body and these some shell spares not contact in order to form this airflow channel in this casing for this airflow channel can be flowed through in order to dispel the heat to this head of this circuit board and this casing to this first heat dissipation air current when this air current produces a rotation.

Drawings

Fig. 1 is a schematic perspective view of a first embodiment of the present invention;

fig. 2 is a partially exploded view of a first embodiment of the present invention;

fig. 3 is an exploded view of the cross-sectional structure of the first embodiment of the present invention;

fig. 4 is a schematic top view of a part of the elements of the first embodiment of the present invention;

fig. 5 is a schematic view (one) of the airflow of the first embodiment of the present invention;

fig. 6 is a schematic view (two) of the airflow of the first embodiment of the present invention;

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

fig. 8 is an exploded perspective view of a second embodiment of the present invention;

fig. 9 is a schematic view (one) of the airflow of the second embodiment of the present invention;

fig. 10 is a schematic view (two) of the airflow according to the second embodiment of the present invention.

[ notation ] to show

10: grinding machine tool

11: casing (CN)

111: head part

112: body part

113: shell

115: air inlet

116: air outlet

117: motor cover

118: air flow channel

119: assembly opening

120: locating slot

121: strip-shaped hole

122: assembling part

123: extension part

124: operation pressing plate

125: connecting hole

126: assembling structure

127: lower casing

128: upper shell

14: drive assembly

140: body

141: circuit board

142: motor with a stator having a stator core

143: airflow generating member

144: output shaft

145: power line

146: bearing seat

147: mounting seat

148: end plate

149: fan blade

150: containing space

151: block body

152: limiting arm

153: limiting wall

16: air guide

161: wind receiving end

162: air outlet end

163: main guide surface

164: auxiliary guide surface

165: approach way

166: inlet port

167: an outlet

168: wire passing port

18: dustproof shade

19: dust collecting pipe

21: end cap

22: heat radiation seat

221: substrate

222: heat radiation fin

30: grinding member

60: first heat radiation airflow

70: second heat radiation airflow

80: dust-collecting airflow

Detailed Description

The detailed description and technical contents of the present invention, with reference to the accompanying drawings, are as follows:

referring to fig. 1 to 6, the present invention provides a grinding machine tool 10 for reducing the casing burning, the grinding machine tool 10 is used in combination with a grinding member 30, and the grinding machine tool 10 includes a casing 11 and a driving assembly 14. The housing 11 has a head 111 and a body 112, and more specifically, the head 111 of the housing 11 is a place where a user grips a palm when operating the grinding machine tool 10, and the body 112 of the housing 11 is a place where a user's wrist or arm can abut when operating the grinding machine tool 10. The housing 11 is composed of at least two housing parts 113, the housing parts 113 are used to form the external shape of the grinding machine tool 10, the housing 11 has an air inlet 115 formed on the body 112 and an air outlet 116 formed on the side of the head 111 away from the body 112, the air inlet 115 and the air outlet 116 are respectively located at positions where they are not shielded by a user when the user operates the grinding machine tool 10. The housing 11 is provided with a motor cover 117 at the head 111, and the motor cover 117 is open at a side facing the polishing member 30. More specifically, after the shells 113 are assembled, the motor cover 117 does not contact the shells 113, so that a gap exists between the shells 113, and an air flow passage 118 is formed between the housing 11 and communicates the air inlet 115 and the air outlet 116.

In this embodiment, the driving assembly 14 includes a circuit board 141 disposed in the housing 11, a motor 142 electrically connected to the circuit board 141, and an airflow generating member 143 rotating synchronously with the motor 142. Specifically, the motor 142 is placed in the open side of the motor cover 117 and partially shielded by the motor cover 117, the airflow generating member 143 is located on the side of the motor 142 facing the polishing member 30, and the end of the motor cover 117 that is open is shielded by the airflow generating member 143 after the assembly of the airflow generating member 143 is completed, so that the end of the motor 142 that is not shielded by the motor cover 117 faces the airflow generating member 143. The motor 142 is activated after receiving the power from the circuit board 141, and an output shaft 144 of the motor 142 is rotated to drive the polishing member 30 to perform a polishing operation. In addition, the motor 142 operates to make the airflow generating member 143 rotate synchronously, and the airflow generating member 143 generates a first heat dissipating airflow 60 and a second heat dissipating airflow 70 when rotating.

Specifically, when the airflow generating member 143 rotates, the air pressure generated in the head 111 changes, so that the external air enters from the air inlet 115 and is converted into the first heat dissipation airflow 60, the first heat dissipation airflow 60 flows along the airflow channel 118 after entering the housing 11, because the motor 142 is shielded by the motor cover 117, the first heat dissipation airflow 60 cannot flow into the motor 142 and flows along the motor cover 117 and the inner wall surface of the head 111, and then the first heat dissipation airflow 60 is guided by the airflow generating member 143 and is discharged from the air outlet 116. The first heat dissipation airflow 60 exchanges heat with the circuit board 141 during flowing, and exchanges heat with the motor housing 117 when flowing through the head 111, thereby removing heat energy accumulated on the circuit board 141 and reducing heat transfer from the motor 142 to the motor housing 117. On the other hand, when the airflow generating member 143 rotates, the air pressure on the side of the motor 142 facing the airflow generating member 143 changes to generate the second heat dissipating airflow 70, the second heat dissipating airflow 70 exchanges heat with the side of the motor 142 facing the airflow generating member 143, and the second heat dissipating airflow 70 is guided by the airflow generating member 143 during flowing and is exhausted to the outside through the air outlet 116, so that the second heat dissipating airflow 70 provides heat dissipation from the side of the motor 142 facing the airflow generating member 143, and the heat on the side of the motor 142 facing the airflow generating member 143 is exhausted out of the housing 11.

Bearing, the utility model discloses except that with this second heat dissipation air current 70 to this motor 142 in the face of this air current produce the heat dissipation of 143 one side, the utility model discloses still utilize this casing 11 equipment to accomplish the back, this motor cover body 117 does not contact these some shell spare 113 and then form this airflow channel 118 for this first heat dissipation air current 60 must flow in this airflow channel 118 and make and produce the air current change in this casing 11, borrow this and reduce the condition that conventional grinding tool machine leads to the heat energy heat radiation to the casing on circuit board and the motor because of inside air is not circulated, solve the uneven problem of heat dissipation of conventional grinding tool machine simultaneously. Furthermore, when the first heat dissipation airflow 60 flows through the airflow channel 118, the motor 142 is shielded by the motor cover 117, so that the first heat dissipation airflow 60 cannot flow into the motor 142 and flows along the surface of the motor cover 117 and the inner wall of the head 111, thereby allowing the first heat dissipation airflow 60 to exchange heat between the motor cover 117 and the head 111, and reducing dust in the first heat dissipation airflow 60 from flowing into the motor 142. Additionally, the utility model discloses when this first heat dissipation air current 60 flows in this casing 11, this first heat dissipation air current 60 except to this motor 142 heat dissipation, this first heat dissipation air current 60 still can carry out the heat exchange to this circuit board 141 simultaneously, and the heat that this circuit board 141 piles up is taken away to this first heat dissipation air current 60 flow in-process, reduces this circuit board 141 heat transfer to this casing 11, borrows this in order to avoid this casing 11 to send out the boiling hot.

In one embodiment, referring to fig. 2 to 8, the grinding machine tool 10 includes an air guiding member 16 disposed in the housing 11, the air guiding member 16 is disposed on the air flow channel 118 to receive the first heat dissipation airflow 60 from the body 112, the air guiding member 16 has an air receiving end 161 and an air outlet end 162, the air outlet end 162 is higher than the air receiving end 161, and the air outlet end 162 and the air receiving end 161 guide the first heat dissipation airflow 60 to flow along the surface of the air guiding member 16. Specifically, the air guide 16 is disposed on one side of the motor cover 117 facing the body 112 and located at the boundary between the body 112 and the head 111, the motor cover 117 is cylindrical, the air guide 16 is disposed at the edge of the motor cover 117 and at least along a half of the circumference of the motor cover 117, the air guide 16 forms a main guide surface 163 and two auxiliary guide surfaces 164, the two auxiliary guide surfaces 164 are respectively disposed on two sides of the main guide surface 163 and extend from the main guide surface 163 to a gap between the side of the motor cover 117 and the inner wall of the head 111, the air flow guide direction of the two auxiliary guide surfaces 164 is different from the air flow guide direction of the main guide surface 163, specifically, the guide surface 163 guides part of the main radiating air flow 60 to a portion of the air flow channel 118 located between the top of the motor cover 117 and the shell 113, so that part of the first radiating air flow 60 exchanges heat with a portion of the head 111 contacting the palm of the user, the two auxiliary guiding surfaces 164 respectively guide a portion of the first heat dissipation airflow 60 to flow into a portion of the airflow channel 118 located between the side of the motor housing 117 and the shells 113, so that a portion of the first heat dissipation airflow 60 exchanges heat with a portion of the head 111 for being grasped by the fingers of the user.

In fact, the guiding channel 165 is implemented by a groove-shaped structure on the guiding channel 16, and the inner wall surface of the head 11 seals one side of the groove-shaped structure, so that the head 111 and the guiding channel 16 jointly define the guiding channel 165, and the guiding channel 165 guides a portion of the first heat dissipation airflow 60 located in the airflow channel 118. An inlet 166 of the guiding channel 165 is connected to the main guiding surface 163 and receives a portion of the first heat dissipating airflow 60 from the main guiding surface 163, and an outlet 167 of the guiding channel 165 is lower than the inlet 166 of the guiding channel 165 to guide a portion of the first heat dissipating airflow 60 to flow toward the air outlet 116. In addition, in the present embodiment, the guide channel 165 is formed by the air guide 16 and the upper housing 128, and in other embodiments, the guide channel 165 may be formed by the air guide 16. In addition, in one embodiment, the air guiding member 16 forms a wire passing opening 168 on the main guiding surface 163, and the wire passing opening 168 provides a power line 145 for connecting the motor 142 and the circuit board 141.

On the other hand, referring to fig. 2 to 6 again, in an embodiment, the motor 142 further includes a main body 140 assembled with the output shaft 144 and a bearing 146 for the grinding element 30 to be assembled and driven by the output shaft 144, the main body 140 is a stator and a rotor as known by those skilled in the art, the main body 140 is electrically connected to the circuit board 141 to drive the output shaft 144 to rotate, the bearing 146 is connected to the side of the output shaft 144 not facing the main body 140, the bearing 146 is assembled with the airflow generating element 143, the bearing 146 is driven by the output shaft 144 when the motor 142 is started, and the airflow generating element 143 and the grinding element 30 rotate therewith. In one embodiment, after the airflow generating member 143 and the seat 146 are assembled, the airflow generating member 143 laterally faces the air outlet 116, and the airflow generating member 143 rotates to guide the first heat-dissipating airflow 60 and the second heat-dissipating airflow 70 to flow toward the air outlet 116. Specifically, the airflow generating member 143 has a mounting base 147 coupled to the base 146, an end plate 148 extending from the mounting base 147, and a plurality of blades 149 disposed on the end plate 148. In one embodiment, the end plate 148 is disposed on the side of the mounting seat 147 facing the motor 142, and the blades 149 are disposed on the end plate 148 and face the side of the motor 142. in one embodiment, the side of the blades 149 facing the end plate 148 is assembled to the end plate 148, and the side of the blades 149 not facing the end plate 148 extends away from the end plate 148, so that the blades 149 are disposed on the end plate 148 in a standing position. The fan blades 149 laterally face the air outlet 116 during the rotation of the airflow generating member 143, and the fan blades 149 drive the first heat dissipating airflow 60 and the second heat dissipating airflow 70 after the rotation of the airflow generating member 143, so that the first heat dissipating airflow 60 and the second heat dissipating airflow 70 flow toward the outer periphery of the end plate 148 and are exhausted from the air outlet 116. In another embodiment, the mounting seat 147 has a receiving space 150 for the bearing seat 146 to be disposed, the bearing seat 146 has two blocks 151 disposed in a staggered manner, and the receiving space 150 conforms to the two blocks 151. In one embodiment, to stably assemble the bearing seat 146 and the airflow generating element 143, at least two limiting arms 152 are disposed on the mounting seat 147, and the at least two limiting arms 152 are used to limit one of the two blocks 151. Moreover, the accommodating space 150 penetrates through two ends of the mounting seat 147, that is, two ends of the mounting seat 147 are open, in order to prevent the bearing seat 146 from separating from the airflow generating element 143, a limiting wall 153 is disposed on one side of the mounting seat 147 away from the end plate 148 in the accommodating space 150, and the limiting wall 153 and the at least two limiting arms 152 limit one of the two block bodies 151 together.

In view of the above, in the foregoing embodiment, the grinding machine tool 10 does not have a dust collecting structure, and in order to reduce the dust scattering during grinding, the grinding machine tool 10 can be implemented by additionally using a dust collecting device during grinding. In another embodiment, referring to fig. 8 to 10, the grinding machine tool 10 of the present embodiment has a dust collecting function, and specifically, the grinding machine tool 10 does not blow dust by the first and second heat dissipating air flows 60 and 70 during grinding, but uses an additional air flow path for dust collection. Further, the housing 11 of the present invention has a mounting opening 119 formed in the head 111, the mounting opening 119 is used for the airflow guiding element 143 to be disposed therein, and the size of the mounting opening 119 is matched with the size of the end plate 148. In other words, the head 111 of the grinding machine tool 10 of the present invention is divided into upper and lower portions by the end plate 148, the motor 142 is accommodated in the head 111 at a side of the end plate 148 away from the grinding element 30, and the first heat-dissipating airflow 60 and the second heat-dissipating airflow 70 flow therein, and the first heat-dissipating airflow 60 and the second heat-dissipating airflow 70 do not flow in the head 111 at a side of the end plate 148 facing the grinding element 30, and the dust-absorbing airflow 80 flows therein. To explain further, the grinding machine tool 10 includes a dust-proof shield 18 disposed on the head 111 and a dust-collecting tube 19 disposed on the dust-proof shield 18, the dust-proof shield 18 is disposed on a side of the housing 11 facing the grinding member 30 and is assembled to the mounting opening 119, the dust-proof shield 18 faces the grinding member 30 after being assembled, and the dust-collecting tube 19 is communicated with the mounting opening 119 through the dust-proof shield 18 and forms an air flow path. The grinding member 30 generates at least one dust while grinding, the dust is blocked by the end plate 148 and moves in the mounting opening 119, and the dust-proof mask 18 prevents the dust from rapidly diffusing to the outside. After the dust collecting tube 19 is activated, the high pressure dust-absorbing airflow 80 is generated, and the dust-absorbing airflow 80 flows on the airflow path and carries the dust, so that the dust flows into the dust collecting tube 19 along the airflow path and the flow of the dust into the airflow channel 118 is reduced.

On the other hand, referring to fig. 6 to 10, in an embodiment, the grinding machine tool 10 includes an end cap 21 disposed at an open end of the motor housing 117, the end cap 21 is assembled to a side of the motor housing 117 facing the airflow generating element 143, and the end cap 21 and the motor housing 117 together shield the motor 142 and stabilize the motor 142 after the assembly.

Referring to fig. 6 to 10, in an embodiment, the circuit board 141 is disposed on the body 112, the grinding machine tool 10 includes a heat sink 22 disposed on the body 112, the heat sink 22 is configured to dissipate heat of the circuit board 141, the housing members 113 are formed with positioning grooves 120 for disposing the heat sink 22, and the air inlets 115 are disposed in the positioning grooves 120 such that the heat sink 22 faces the air inlets 115. Further, the air inlet 115 is composed of a plurality of bar holes 121, the heat sink 22 includes a substrate 221 disposed on the circuit board 141 and a plurality of heat dissipation fins 222 disposed on the substrate 221, the heat dissipation fins 222 do not interfere with the air inlet 115, specifically, the heat dissipation fins 222 are disposed at intervals and the heat dissipation fins 222 are not disposed on the air inlet path of the bar holes 121, so that the heat dissipation fins 222 do not affect the air inlet of the bar holes 121.

In another embodiment, the shells 113 are divided into a lower shell 127 and an upper shell 128, the lower shell 127 is assembled with the motor housing 117, and the upper shell 128 does not contact the motor housing 117 and defines the airflow channel 118 together with the lower shell 127. In one embodiment, the lower housing 127 forms the air inlet 115, and the lower housing 127 provides the first heat-dissipating airflow 60 into the housing and allows the first heat-dissipating airflow 60 to flow between the upper housing 128 and the lower housing 127. In another embodiment, the motor housing 117 may be formed from one of the shells 113 divided into the lower shell 127. Further, the upper housing 128 includes an assembling portion 122 assembled with the lower housing 127 and forming the body portion 112 together with the lower housing 127, and an extending portion 123 extending from the assembling portion 122 and forming the head portion 111 together with the lower housing 127, the assembling portion 122 is assembled with an operating pressing plate 124 for operation, and the extending portion 123 covers the motor housing 117 and forms the airflow channel 118 with the motor housing 117. In one embodiment, the extension 123 is formed with a coupling hole 125, the motor housing 117 is formed with an assembling structure 126 matching with the coupling hole 125, and the assembling structure 126 is assembled in the coupling hole 125 to assist the motor housing 117 to be stably disposed in the head 111.

Claims (15)

1. An abrasive machine tool for reducing casing burn, comprising:

a shell which is divided into a head part and a body part and consists of at least two shell parts, wherein the shell is provided with an air inlet formed on the body part and an air outlet formed on one side of the head part far away from the body part; and

the driving assembly comprises a circuit board arranged in the shell, a motor which is arranged in the motor cover body and connected with the circuit board to drive the grinding piece to rotate, an airflow generating piece which shields one side of the motor cover body facing the grinding piece and synchronously rotates with the motor, a first heat dissipation airflow which can dissipate heat of the circuit board and the head of the shell through the airflow channel and can be generated in the shell when the airflow generating piece rotates, and a second heat dissipation airflow which can dissipate heat of one side of the motor facing the airflow generating piece.

2. The grinding machine tool of claim 1, wherein the grinding machine tool comprises a wind guide disposed in the housing and located in the airflow channel, the wind guide having a wind receiving end and a wind exiting end higher than the wind receiving end.

3. The machine tool of claim 2, wherein the motor housing is cylindrical, and the air guide member forms a main guide surface along the edge of the motor housing and two auxiliary guide surfaces disposed on opposite sides of the main guide surface and having different flow directions from the main guide surface.

4. The grinder tool machine for reducing casing hair waving as set forth in claim 2 or 3, wherein said air guide has both sides extended in the gap between the side of said motor cover and the inner wall of said head respectively and is formed with a guide passage having an inlet higher than an outlet.

5. The grinder tool machine for reducing casing burn of claim 2, wherein the air guide is located at the interface between the body and the head.

6. The grinder tool machine for reducing casing hair waving according to any one of claims 1 to 3, wherein the motor comprises an output shaft and a seat for the grinder assembly to be assembled and driven by the output shaft, and the airflow generator comprises a mounting seat for the seat, an end plate extending from the mounting seat, and a plurality of blades disposed on a side of the end plate facing the motor housing.

7. The grinder tool machine for reducing casing burn of claim 6, wherein the blades stand on the end plate.

8. The grinding machine tool for reducing cabinet burn of claim 6 wherein the holder comprises two blocks disposed in a staggered arrangement, the mounting having a receiving space shaped to fit the two blocks.

9. The abrasive machine tool of claim 8, wherein said mounting base includes at least two limiting arms for limiting said carrier from disengaging.

10. The grinder tool machine for reducing casing hair waving of claim 9, wherein the receiving space penetrates two ends of the mounting base, the mounting base is provided with a limiting wall at one end of the receiving space away from the blades, and the limiting wall and the at least two limiting arms limit the bearing seat together.

11. The abrasive machine tool of any one of claims 1 to 3, further comprising an end cap disposed at an open end of the motor housing.

12. The abrasive machine tool of any one of claims 1 to 3, wherein said housing members are divided into a lower housing and an upper housing, said lower housing being assembled to said motor housing, said upper housing not contacting said motor housing and forming said air flow path together with said lower housing.

13. The abrasive machine tool of any one of claims 1 to 3, further comprising a dust shield coupled to the housing and positioned on the head, and a dust tube positioned on the dust shield.

14. The grinding machine tool for reducing casing burn according to any one of claims 1 to 3, wherein the circuit board is disposed on the body, the grinding machine tool comprises a heat sink disposed on the body and capable of dissipating heat from the circuit board, the casings are formed with a positioning groove for the heat sink to be placed therein, and the air inlet is formed in the positioning groove.

15. The abrasive machine tool of claim 14, wherein said air inlet is comprised of a plurality of bar holes.

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