Head of power tool, air passage structure, locking device and power tool

Abstract

Disclosed in the present invention are a head of a power tool, an air passage structure, a locking device and a power tool. The head is internally provided with a motor; a fan is arranged on the outer side of the head, and the fan blows air towards the head. The present invention uses the design of direct tight fit of a motor cavity and the motor on the inner side of the head to ensure excellent heat conductivity, and simultaneously uses the fan provided on the outer side of the head for cooperation and, with the fan directly blowing airflow to the rear wall of the head, fully uses the heat dissipation area of the head to achieve rapid heat dissipation, thus effectively improving the heat dissipation performance.

Description

A power tool head, air duct structure, locking device and power tool Technical Field

[0001] The present invention belongs to the technical field of electric tools, and relates to a handpiece, an air duct structure, a locking device and the electric tool. Background Art

[0002] Angle grinders are common power tools that generate a large amount of heat when running at high speeds. Existing heat dissipation designs for angle grinders typically use fans to generate heat dissipation airflow. However, angle grinders generate a large amount of dust during operation. The heat dissipation method of using fans directly blowing the motor can cause dust to enter the motor and cause damage, making it difficult to balance excellent heat dissipation performance and safety in design. Summary of the Invention

[0003] In order to overcome the deficiencies of the prior art, the present invention provides a handpiece of an electric tool, an air duct structure, a locking device and the electric tool.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A handpiece of an electric tool is provided. A motor is arranged inside the handpiece, and a fan is arranged outside the handpiece for blowing air toward the handpiece.

[0006] Furthermore, the head includes a front wall and a rear wall of the head, and air outlets connected to the rear wall of the head are provided on both sides of the head, and the blowing direction of the fan is toward the rear wall of the head.

[0007] Furthermore, the motor includes a stator and a rotor, and a motor cavity for installing the motor is provided in the machine head, and the inner peripheral wall of the motor cavity is cooperatively connected with the outer periphery of the stator; the outer peripheral annular array of the rotor is provided with six magnets; the stator includes a plurality of punching sheets distributed along the annular array, and the punching sheets are provided with windings; the punching sheets are in an I-shaped structure, and a clamping strip and a clamping slot are provided on both sides of the punching sheets respectively; it also includes a circuit board, which is provided at one axial end of the stator, and the circuit board is connected to the winding; the rotor includes a shaft body, and the shaft body is provided with a thread for installing a tool head.

[0008] Furthermore, it also includes a locking device, which includes a locking piece. A connecting channel for passing the locking piece is opened on the side of the head, and one end of the rotor of the motor is provided with a plurality of locking grooves for one end of the locking piece to be clamped.

[0009] Furthermore, the rotor includes a shaft driven by the motor stator and passing through the upper and lower ends of the motor respectively, and a clamping piece fixedly connected to the upper end of the shaft, and the locking groove is provided on the outside of the clamping piece; the connecting channel and the locking piece are arranged on a horizontal plane perpendicular to the axis of the rotor, and the locking piece slides axially along the connecting channel; the head includes a motor housing and a cover plate installed on the upper end of the motor housing, the upper end of the motor housing is provided with a through hole for passing the clamping piece, the cover plate is provided with an inner cavity and covers the outside of the clamping piece, and the connecting channel is provided on the cover plate; the connecting channel and the locking piece are located at the rear, left, right and front sides of the central axis of the cover plate. One or more sides of the side; the locking member includes a sliding rod slidably connected to the connecting channel, a limiting portion arranged on the inner side of the sliding rod for limiting the sliding rod from completely disengaging from the connecting channel, a button end detachably connected to the outer side of the sliding rod, and an elastic member arranged between the button end and the shell for pushing the button end outward; the cover plate is detachably connected to the motor shell, and a pressing channel for moving the button end inward and outward is provided on the cover plate; a latch portion is provided on the outer side of the sliding rod, and a socket for fixing the latch portion is provided on the button end; a limiting groove is provided on the inner side of the button end and is opened on the outer side of the sliding rod, and the side of the elastic member close to the button end is installed in the limiting groove.

[0010] Furthermore, the machine head includes a motor housing and a cover plate arranged above the motor housing, the rotor of the motor passes through the top of the motor housing and is fixedly connected with a clip, the locking piece is installed on the side of the clip and locked with the clip, the top of the motor housing is provided with a locking mounting portion for installing the locking piece, and the connecting channel is opened on the locking mounting portion; it also includes a protective portion, the protective portion and the locking mounting portion cooperate with each other and form a accommodating groove body on the outside of the clip, the cover plate is detachably connected to the motor housing, and the bottom of the cover plate is provided with a wrapping portion that cooperates with the protective portion and the locking mounting portion, and the wrapping portion is in the An upper groove body is formed on the inner wall of the cover plate, and the accommodating groove body cooperates with the upper groove body and seals the clamping piece; a positioning groove is formed on the protective part, and a downwardly protruding positioning block is formed on the wrapping part, and the positioning block and the positioning groove are positioned and matched with each other; a clamping groove is formed at the center position of the clamping piece, which passes through the top and bottom of the clamping piece, and the clamping groove is polygonal in structure and is clamped with the top of the rotor of the motor, and a plurality of locking grooves are formed on the circumference of the clamping piece, and the locking piece is slidably arranged in the connecting channel and is on the same horizontal plane as the locking groove; the motor housing, the locking mounting part and the protective part are integrally formed of metal material, and the cover plate is separated by a partition The locking member includes a sliding rod slidably connected to the connecting channel and perpendicular to the rotor, a limiting portion arranged on the inner side of the sliding rod and extending into the inner cavity to engage with the locking groove, a latch portion arranged on the outer side of the sliding rod, a button end provided with an insertion hole and connected to the latch portion through the insertion hole, and an elastic member arranged between the button end and the locking mounting portion, wherein the size of the limiting portion is larger than the size of the sliding rod and the connecting channel, the end face of the limiting portion away from the locking groove is provided with a first limiting surface, and the inner side of the locking mounting portion is provided with a second limiting surface, when the elastic member drives the button end to reset outward, The first limiting surface abuts against the second limiting surface, limiting the sliding rod from completely disengaging from the connecting channel; a slot is provided on the cover plate, and the slot wall fits with the top of the motor housing to form a guide channel, and the button end is slidably arranged in the guide channel; an arc-shaped portion is formed on the inner side of the button end, and a guide portion matching the arc-shaped portion is provided on the outer side of the locking mounting portion, and when the button end moves toward the locking mounting portion, the arc-shaped portion and the guide portion are movably abutted; an anti-slip groove is provided on the outer end surface of the button end, and several anti-slip grooves are symmetrically arranged along the jack to increase the friction force when the button end is pressed inward.

[0011] An electric tool includes the head of the above-mentioned electric tool, including a handle, a left housing, and a right housing. The head is connected to one end of the handle, and the left housing and the right housing are arranged at the other end of the handle. A channel is provided in the handle, and the left housing and the right housing are combined to form an internal cavity for accommodating a control circuit. The channel is connected to the internal cavity, and an air inlet is provided on the left housing or the right housing; a switch is provided at the front end of the handle.

[0012] A wind duct structure for an electric tool includes a handpiece, a handle and a blower. A motor cavity for installing a motor is provided in the handpiece. The handpiece is connected to one end of the handle. The handpiece includes a front wall and a rear wall. Air outlets connected to the rear wall of the handpiece are provided on both sides of the handpiece. The blower is provided in the handle and blows air toward the rear wall of the handpiece.

[0013] Furthermore, the fan is connected to the rear wall of the machine head.

[0014] Furthermore, it also includes a left casing and a right casing, and the left casing and the right casing are arranged at the other end of the handle, and a channel is provided in the handle, one end of the channel faces the rear wall of the head, and the fan is arranged at the other end of the channel, or the fan is arranged in the left casing and the right casing.

[0015] Furthermore, a channel is provided in the handle, and the left housing and the right housing are matched to form an internal cavity for accommodating the control circuit. The channel is connected to the internal cavity, and an air inlet is provided on the left housing or the right housing.

[0016] Furthermore, the motor includes a stator and a rotor, and the inner circumferential wall of the motor cavity is cooperatively connected with the outer circumference of the stator; the outer circumferential annular array of the rotor is provided with six magnets; the stator includes a plurality of punching sheets distributed along the annular array, and the punching sheets are provided with windings; the punching sheets are in an I-shaped structure, and a clamping strip and a clamping slot are provided on both sides of the punching sheets respectively; it also includes a circuit board, which is provided at one axial end of the stator and is connected to the winding; the rotor includes a shaft body, and the shaft body is provided with a thread for installing a tool head.

[0017] Furthermore, it also includes a locking device, which includes a locking piece and a motor installed in the machine head. A connecting channel for passing the locking piece is opened on the side of the machine head, and a plurality of locking grooves for one end of the locking piece to be clamped are provided on the rotor of the motor.

[0018] Furthermore, the rotor includes a shaft driven by the motor stator and passing through the upper and lower ends of the motor respectively, and a clamping piece fixedly connected to the upper end of the shaft, and the locking groove is provided on the outside of the clamping piece; the connecting channel and the locking piece are arranged on a horizontal plane perpendicular to the axis of the rotor, and the locking piece slides axially along the connecting channel; the head includes a motor housing and a cover plate installed on the upper end of the motor housing, the upper end of the motor housing is provided with a through hole for passing the clamping piece, the cover plate is provided with an inner cavity and covers the outside of the clamping piece, and the connecting channel is provided on the cover plate; the connecting channel and the locking piece are located at the rear, left, right and front sides of the central axis of the cover plate. One or more sides of the side; the locking member includes a sliding rod slidably connected to the connecting channel, a limiting portion arranged on the inner side of the sliding rod for limiting the sliding rod from completely disengaging from the connecting channel, a button end detachably connected to the outer side of the sliding rod, and an elastic member arranged between the button end and the shell for pushing the button end outward; the cover plate is detachably connected to the motor shell, and a pressing channel for moving the button end inward and outward is provided on the cover plate; a latch portion is provided on the outer side of the sliding rod, and a socket for fixing the latch portion is provided on the button end; a limiting groove is provided on the inner side of the button end and is opened on the outer side of the sliding rod, and the side of the elastic member close to the button end is installed in the limiting groove.

[0019] Furthermore, the machine head includes a motor housing and a cover plate arranged above the motor housing, the rotor of the motor passes through the top of the motor housing and is fixedly connected with a clip, the locking piece is installed on the side of the clip and locked with the clip, the top of the motor housing is provided with a locking mounting portion for installing the locking piece, and the connecting channel is opened on the locking mounting portion; it also includes a protective portion, the protective portion and the locking mounting portion cooperate with each other and form a accommodating groove body on the outside of the clip, the cover plate is detachably connected to the motor housing, and the bottom of the cover plate is provided with a wrapping portion that cooperates with the protective portion and the locking mounting portion, and the wrapping portion is in the An upper groove body is formed on the inner wall of the cover plate, and the accommodating groove body cooperates with the upper groove body and seals the clamping piece; a positioning groove is formed on the protective part, and a downwardly protruding positioning block is formed on the wrapping part, and the positioning block and the positioning groove are positioned and matched with each other; a clamping groove is formed at the center position of the clamping piece, which passes through the top and bottom of the clamping piece, and the clamping groove is polygonal in structure and is clamped with the top of the rotor of the motor, and a plurality of locking grooves are formed on the circumference of the clamping piece, and the locking piece is slidably arranged in the connecting channel and is on the same horizontal plane as the locking groove; the motor housing, the locking mounting part and the protective part are integrally formed of metal material, and the cover plate is separated by a partition The locking member includes a sliding rod slidably connected to the connecting channel and perpendicular to the rotor, a limiting portion arranged on the inner side of the sliding rod and extending into the inner cavity to engage with the locking groove, a latch portion arranged on the outer side of the sliding rod, a button end provided with an insertion hole and connected to the latch portion through the insertion hole, and an elastic member arranged between the button end and the locking mounting portion, wherein the size of the limiting portion is larger than the size of the sliding rod and the connecting channel, the end face of the limiting portion away from the locking groove is provided with a first limiting surface, and the inner side of the locking mounting portion is provided with a second limiting surface, when the elastic member drives the button end to reset outward, The first limiting surface abuts against the second limiting surface, limiting the sliding rod from completely disengaging from the connecting channel; a slot is provided on the cover plate, and the slot wall fits with the top of the motor housing to form a guide channel, and the button end is slidably arranged in the guide channel; an arc-shaped portion is formed on the inner side of the button end, and a guide portion matching the arc-shaped portion is provided on the outer side of the locking mounting portion, and when the button end moves toward the locking mounting portion, the arc-shaped portion and the guide portion are movably abutted; an anti-slip groove is provided on the outer end surface of the button end, and several anti-slip grooves are symmetrically arranged along the jack to increase the friction force when the button end is pressed inward.

[0020] An electric tool comprises the above-mentioned air duct structure of the electric tool, wherein a switch is provided at the front end of the handle.

[0021] A locking device for an electric tool comprises a locking member and a motor installed in a tool head. A connecting channel for passing the locking member is provided on the side of the tool head, and a rotor of the motor is provided with a plurality of locking grooves for one end of the locking member to be clamped in.

[0022] Furthermore, the rotor includes a shaft driven by the motor stator and passing through the upper and lower ends of the motor respectively, and a clamping piece fixedly connected to the upper end of the shaft, and the locking groove is provided on the outside of the clamping piece.

[0023] Furthermore, the connecting channel and the locking member are arranged on a horizontal plane perpendicular to the axis of the rotor, and the locking member slides axially in the connecting channel.

[0024] Furthermore, the machine head includes a motor housing and a cover plate installed on the upper end of the motor housing, the upper end of the motor housing is provided with a through hole for passing the clamping piece, the cover plate is provided with an inner cavity and covers the outside of the clamping piece, and the connecting channel is provided on the cover plate.

[0025] Furthermore, the connecting channel and the locking member are located on one or more sides of the rear side, left side, right side, and front side of the central axis of the cover plate.

[0026] Furthermore, the locking member includes a sliding rod slidably connected in the connecting channel, a limiting portion arranged on the inner side of the sliding rod for limiting the sliding rod from completely escaping from the connecting channel, a button end detachably connected to the outer side of the sliding rod, and an elastic member arranged between the button end and the shell for pushing the button end outward.

[0027] Furthermore, the cover plate is detachably connected to the motor housing, and a pressing channel for moving the button end inward and outward is provided on the cover plate; a latch portion is provided on the outer side of the sliding rod, and a socket for fixing the latch portion is provided on the button end; a limiting groove is provided on the inner side of the button end and is opened on the outer side of the sliding rod, and the side of the elastic member close to the button end is installed in the limiting groove.

[0028] A power tool includes the locking device of the power tool mentioned above, and also includes a handle detachably connected to the head and an electronic control system installed on the handle for powering the motor, the head includes a motor housing and a cover installed on the upper end of the motor housing, the motor housing includes a first connecting end connected to the handle and a motor mounting end fixedly connected to the first connecting end, the cover is installed above the motor mounting end, the motor mounting end is provided with a wire connection channel connecting the inner cavity of the cover and the motor, and the first connecting end is provided with a wire threading channel connecting the interior of the handle and the inner cavity of the cover.

[0029] A locking device for an electric tool includes a handpiece and a motor installed in the handpiece, the handpiece including a motor housing and a cover plate arranged above the motor housing, the rotor of the motor passes through the top of the motor housing and is fixedly connected to a clamping piece, the locking piece is installed on the side of the clamping piece and locked with the clamping piece, a locking mounting portion is provided on the top of the motor housing, and a connecting channel for passing the locking piece is opened on the locking mounting portion.

[0030] Furthermore, it also includes a protective part, which cooperates with the locking mounting part to form a receiving groove on the outside of the clip, and the cover plate is detachably connected to the motor housing. The bottom of the cover plate is provided with a wrapping part that cooperates with the protective part and the locking mounting part, and the wrapping part forms an upper groove on the inner wall of the cover plate, and the receiving groove cooperates with the upper groove and seals the clip.

[0031] Furthermore, a positioning groove is provided on the protective portion, and a downwardly protruding positioning block is formed on the wrapping portion, and the positioning block and the positioning groove are positioned and matched with each other.

[0032] Furthermore, a slot is provided at the center of the clamping member, which passes through the top and bottom of the clamping member. The slot is polygonal in structure and is clamped to the top of the rotor of the motor. A plurality of locking slots are provided on the circumference of the clamping member. The locking member is slidably arranged in the connecting channel and is on the same horizontal plane as the locking slots.

[0033] Furthermore, the motor housing, the locking mounting portion and the protective portion are integrally formed of metal material, and the cover plate is made of heat-insulating material.

[0034] Furthermore, the locking member includes a sliding rod slidably connected in the connecting channel and perpendicular to the rotor, a limiting portion arranged on the inner side of the sliding rod and extending into the inner cavity to engage with the locking groove, a latch portion arranged on the outer side of the sliding rod, a button end provided with a socket and connected to the latch portion through the socket, and an elastic member arranged between the button end and the locking mounting portion, wherein the size of the limiting portion is larger than the size of the sliding rod and the connecting channel, the end face of the limiting portion away from the locking groove is provided with a first limiting surface, and the inner side of the locking mounting portion is provided with a second limiting surface, when the elastic member drives the button end to reset outward, the first limiting surface abuts against the second limiting surface, limiting the sliding rod from completely disengaging from the connecting channel.

[0035] Furthermore, a notch is provided on the cover plate, a groove wall of the notch is fitted with the top end of the motor housing to form a guide channel, and the button end is slidably arranged in the guide channel.

[0036] Furthermore, an arcuate portion is formed on the inner side of the button end, and a guide portion matching the arcuate portion is provided on the outer side of the locking mounting portion. When the button end moves toward the locking mounting portion, the arcuate portion and the guide portion are movably abutted.

[0037] Furthermore, an anti-slip groove is provided on the outer end surface of the button end, and a plurality of the anti-slip grooves are symmetrically arranged along the insertion hole to increase the friction force when the button end is pressed inward.

[0038] An electric tool comprises the locking device of the electric tool described above, and also includes a handle detachably connected to the machine head, and an electronic control system installed on the handle for powering the motor; the motor housing includes a first connection end connected to the handle and a second connection end integrally formed with the first connection end; a wire groove is formed at a position adjacent to the first connection end and the second connection end, and a through hole connected to the interior of the handle is provided on the bottom wall of the wire groove, and a pair of guide columns for positioning the cover plate are provided on the second connection end, and the guide columns are connected to the groove wall of the wire groove on the adjacent side, and an opening area is formed between the two guide columns, and a lead channel is also provided on the second connection end, and the lead channel is located between the opening area and the locking mounting portion.

[0039] In summary, the present invention is beneficial in that:

[0040] The present invention adopts a design in which the motor cavity inside the head is directly and tightly matched with the motor, ensuring excellent thermal conductivity. At the same time, a fan is arranged on the outside of the head for cooperation. The airflow from the fan blows directly onto the rear wall of the head, making full use of the heat dissipation area of ​​the head to quickly dissipate heat and effectively improve the heat dissipation performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] FIG1 is a schematic diagram of the appearance structure of the electric tool in Example 1.

[0042] FIG2 is a schematic diagram of the cross-sectional structure in FIG1 .

[0043] FIG3 is a schematic diagram of the disassembled structure of the machine head in Example 1.

[0044] FIG4 is a schematic structural diagram of FIG3 from another perspective.

[0045] FIG5 is a schematic diagram of the rotor and stator structure of the motor in Example 1.

[0046] Figure 6 is a schematic diagram of the stator punching structure in Example 1

[0047] FIG7 is a schematic structural diagram of other configurations of the blower in FIG2 .

[0048] FIG8 is a schematic structural diagram of the power tool head in Example 2;

[0049] FIG9 is a schematic diagram of the installation of the head in Example 2;

[0050] FIG10 is an exploded view of the head of the power tool in Example 2;

[0051] Figure 11 is a schematic structural diagram of the rotor in Example 2;

[0052] Figure 12 is a schematic structural diagram of the locking member in Example 2;

[0053] FIG13 is a cross-sectional view of the locking member and the locking member housing in Example 2;

[0054] FIG14 is an exploded view of the power tool in Example 2;

[0055] FIG15 is a schematic structural diagram of Example 2 when the locking member is provided at the front end of the machine head;

[0056] FIG16 is a schematic structural diagram of Example 2 when the locking member is arranged at the rear end of the nose;

[0057] FIG17 is a schematic structural diagram of the direct-drive handpiece in Example 3;

[0058] FIG18 is a schematic structural diagram of the motor housing, the locking mounting portion, and the protective portion in Example 3;

[0059] FIG19 is a bottom view of the cover plate in Example 3;

[0060] Figure 20 is a cross-sectional view of the structure of the head in Example 3;

[0061] Figure 21 is a schematic structural diagram of the rotor and the clamping member in Example 3;

[0062] Figure 22 is a schematic structural diagram of the locking member in Example 3;

[0063] FIG23 is a schematic structural diagram of the locking mounting portion and the locking member in Example 3;

[0064] FIG24 is a top view of the motor housing in Example 3;

[0065] FIG25 is a schematic structural diagram of the electric tool in Example 3;

[0066] FIG26 is an exploded view of the structure of the electric tool in Example 3.

[0067] Markings in the figure: 1. Motor housing; 10. Locking mounting portion; 11. Shaft; 100. Motor; 102. Snap-fitting member; 103. Protective portion; 104. Locking groove; 105. Locking member; 106. Sliding rod; 107. Limiting portion; 108. Accommodating slot; 109. Latch portion; 110. Insertion hole; 111. Button end; 112. Arc-shaped portion; 113. Anti-slip groove; 114. Elastic member; 116. Second limiting surface; 117. Guide portion; 118. Slot; 119. Positioning groove; 120. First limiting surface; 121. First connecting end; 122. Second connecting end; 123. Wire groove; 124. Through hole; 125. Guide column 126. Opening area; 127. Lead channel; 12. Connection channel; 13. Press channel; 14. Working disk; 15. Wire connection channel; 16. Threading channel; 2. Cover plate; 200. Wrapping part; 201. Positioning block; 202. Upper trough body; 203. Notch; 204. Guide channel; 3. Handle; 301. Switch; 4. Electronic control system; 401. Left housing; 402. Right housing; 501. Front wall of machine head; 502. Rear wall of machine head; 503. Motor cavity; 504. Air outlet; 505. Self-locking part; 61. Stator; 62. Rotor; 601. Punching sheet; 602. Circuit board; 603. Magnet; 7. Fan; 9. Limit slot. DETAILED DESCRIPTION

[0068] The present invention will be further described below in conjunction with the accompanying drawings:

[0069] Example 1

[0070] This embodiment provides an air duct structure of an electric tool, which includes a head, a handle 3 , a left housing 401 and a right housing 402 , as shown in FIG1 .

[0071] The handle 3 is used for the user to grasp. The handle 3 includes two ends. The head is fixedly connected to one of the ends of the handle 3. A motor is provided in the head, as shown in FIG2 .

[0072] The left housing 401 and the right housing 402 are fixedly connected to each other, and after being matched, an internal cavity for accommodating the control circuit is formed. After the left housing 401 and the right housing 402 are matched, they are further fixedly connected to the other end of the handle 3.

[0073] The handpiece and the handle 3 can be fixed by screw connection. A motor cavity 503 for accommodating the motor is provided inside the handpiece. Referring to Figures 3 and 4, the inner circumferential wall of the motor cavity 503 is preferably a circular hole-shaped structure, which is used to form a tight fit with the outer periphery of the stator 61 of the motor, that is, the inner circumferential wall of the motor cavity 503 is formed as the outer wall of the motor, providing excellent heat conduction from the motor to the handpiece.

[0074] 5 , the motor further comprises a rotor 62, which is passed through the center of the stator 61. The rotor 62 comprises a shaft, on which a magnetic sleeve is fixedly provided, and on which a plurality of magnets 603 are fixedly mounted. The plurality of magnets 603 are exposed on the outer periphery of the rotor 62, and the magnets 603 are distributed in a circular array with the shaft as the center. In this embodiment, preferably, the number of magnets 603 is set to six, so as to form six-level magnets in the circumferential direction of the rotor 62. The gap between the magnets 603 and the inner periphery of the stator 61 is reduced by the exposed magnets 603, so as to reasonably enhance the torque formed by the rotor 62 and the stator 61. One axial end of the shaft is passed through the outside of the machine head and is provided with an external thread or an internal thread for connecting with the tool head of the angle grinder. The tool head of the angle grinder includes a cutting disc, a grinding disc, a louver wheel, a wire wheel, and the like.

[0075] 6 , the stator 61 is composed of a plurality of punching sheets 601 spliced ​​together, and the punching sheets 601 are in an I-shaped structure. An independent winding is wound around the middle of each punching sheet 601, and the plurality of punching sheets 601 are distributed along a circular array to form a ring-shaped stator 61 structure, wherein the punching sheets 601 are provided with a clamping strip and a clamping groove at the front and rear ends in the circumferential direction, respectively, for forming a clamping fit with the front and rear adjacent punching sheets 601, thereby ensuring accurate positioning between the punching sheets 601 and a stable structure when the stator 61 is assembled.

[0076] A circuit board 602 and a protective rubber sleeve are also provided at one axial end of the stator 61. The circuit board 602 is annular in structure and is distributed along the outer circumference of the stator 61. The windings on each punching sheet 601 are provided with pins so that the pins of each winding are electrically connected to the circuit board 602. Thus, all the windings of the stator 61 are connected through the circuit board 602. The protective rubber sleeve is provided on the circuit board 602 to provide protection.

[0077] The periphery of the head is formed with a head front wall 501 and a head rear wall 502, wherein the head rear wall 502 is set toward the handle 3, and a fan 7 is set between the handle 3 and the head. The fan 7 is fixedly connected to the head by screws, or the fan 7 is fixedly connected to the handle 3 by screws, so that the blowing direction of the fan 7 is toward the head rear wall 502, thereby dissipating the heat of the head rear wall 502.

[0078] Air outlets 504 are provided on the left and right sides of the machine head respectively. The air outlets 504 are connected to the rear wall 502 of the machine head. The fan 7 blows air directly to the rear wall 502 of the machine head, and the air flow is further blown outward along the air outlets 504.

[0079] A channel is provided in the handle 3, one end of the channel forms a connecting opening toward the rear wall 502 of the machine head, and an air inlet can be provided on the handle 3 to connect the channel with the outside of the handle 3, so that the airflow required by the fan 7 can be generated by the external air flowing into the channel through the air inlet.

[0080] Furthermore, the other end of the channel can also be set to be connected to the internal cavity formed by the left casing 401 and the right casing 402, and the air inlet can also be set on the left casing 401 or the right casing 402, so that the air flow can enter the internal cavity through the air inlet and then enter the channel, thereby simultaneously dissipating heat for the control circuit.

[0081] Furthermore, in other cases, referring to Figure 7, the fan 7 can also be set in the channel of the handle at the other end away from the head. When the fan 7 is working, it generates airflow, which flows through the channel and blows directly onto the rear wall 502 of the head to dissipate heat from the rear wall 502 of the head.

[0082] Specifically, it should be noted that the blowing direction of the fan 7 is set toward the rear wall 502 of the head, and also includes the axial direction of the fan 7 being set vertically or at an inclined set angle toward the rear wall 502 of the head, so that the wind of the fan 7 directly contacts the rear wall 502 of the head, or, it also includes setting the fan 7 at a set angle and position in the handle 3, so that after the fan 7 blows out the wind, the airflow flows along the channel and blows toward the rear wall 502 of the head. The above settings of the fan 7 can achieve heat dissipation of the head and the motor.

[0083] It should be added that a self-locking portion 505 is also provided on the machine head, and a locking groove is provided on the shaft body for the end of the self-locking portion 505 to be snapped into. When the self-locking portion 505 is snapped into the locking groove, the shaft body can be locked; a switch 301 is also provided on the handle 3, and the switch 301 is provided on the side of the handle 3 close to the machine head, which is used to switch the working state of the angle grinder.

[0084] Example 2

[0085] 8 to 10 : This embodiment discloses a locking device for an electric tool, comprising a machine head, a motor 100 mounted on the inside of the machine head, a rotor 62 mounted in the motor 100 and directly driven by the motor stator, and a working disk 14 detachably mounted on the lower end of the rotor 62 . The working disk 14 in this embodiment is directly driven by the motor 100 ; specifically, after the motor 100 is energized, the rotor 62 rotates, and the rotation of the rotor 62 drives the working disk 14 to rotate and work; the working disk 14 in this embodiment may be a grinding disk or a polishing disk; wherein the working disk 14 can be mounted on the lower end of the rotor 62 by threaded fixation. Specifically, in this embodiment, the lower end of the rotor 62 is provided with an external thread, and a mounting hole is provided at the center of the working disk 14 which is sleeved on the outside of the threaded end of the rotor 62. A boss portion mounted on the outside of the rotor 62 is provided above the working disk 14, and a fixing nut threadedly connected to the rotor 62 is provided below the working disk 14, and the working disk 14 is clamped and fixed between the fixing nut and the boss portion.

[0086] As shown in Figures 9 and 10, in this embodiment, to facilitate the removal and replacement of the working disk 14 on the rotor 62, a shaft lock structure is provided on the power tool head to lock the rotor 62 and prevent the rotor 62 from rotating. At the same time, since this embodiment adopts a method of directly driving the working disk 14 to rotate by the motor 100, in order to facilitate the operation of the power tool, the height of the power tool head in the vertical direction needs to be relatively reduced during the design and development of the power tool. Therefore, in this embodiment, the shaft lock structure is designed on the side of the power tool head, so that the shaft lock structure locks the rotation axis of the power tool head in the lateral direction. A plurality of locking grooves 104 are provided on the rotor 62. Specifically, the locking member 105 in this embodiment has three locking grooves 104, and the locking grooves 104 are evenly distributed. A connecting channel 12 corresponding to the locking grooves 104 is provided on the side of the head. A locking member 105 arranged below the upper end surface of the head is slidably connected to the connecting channel 12. When the locking member 105 slides inward, it engages laterally in the locking groove 104 to restrict the rotation of the rotor 62.

[0087] Specifically, as shown in Figure 13, the locking member 105 in this embodiment includes a sliding rod 106 slidably connected in the connecting channel 12, a limiting portion 107 arranged on the inner side of the sliding rod 106 for limiting the sliding rod 106 from completely disengaging from the connecting channel 12, a button end 111 detachably connected to the outside of the sliding rod 106, and an elastic member 114 arranged between the button end 111 and the shell 1 for pushing the button end 111 outward.

[0088] In this embodiment, a limiting portion 107 having a size larger than that of the connecting channel 12 is provided at the inner end of the sliding rod 106, thereby preventing the sliding rod 106 from falling out from the connecting channel 12; further, a limiting groove 9 is provided on the inner side of the button end 111 and is opened on the outer side of the sliding rod 106, and the elastic member 114 is installed in the limiting groove 9 on the side close to the button end 111, wherein the elastic member 114 in this embodiment can be a reset spring. When not pressed by force, the reset spring is in a relaxed state, thereby making the locking member 105 in a state where the outermost side is not in contact with the locking groove 104 and is limited. When the axis lock is required, the button end 111 is pressed inwardly, thereby causing the reset spring to contract and the sliding rod 106 to slide inward and causing the limiting portion 107 to be stuck in the locking groove.

[0089] Furthermore, in order to facilitate the installation of the return spring, in this embodiment, a latch portion 109 is provided on the outside of the sliding rod 106, and a socket 110 for fixing the latch portion 109 is opened on the button end 111; then, during installation, the sliding rod 106 can be first passed through the connecting channel 12 from the inside to the outside, and then the return spring can be sleeved on the outside of the sliding rod 106, and finally the latch portion 109 on the sliding rod 106 is inserted into the socket 110 of the button end 111, so that the button end 111 and the sliding rod 106 are fixedly installed by interference fit.

[0090] As shown in FIG11 , in order to facilitate the processing of the locking groove 104 in this embodiment, the rotor 62 is composed of a two-part structure; specifically, the rotor 62 includes a shaft body 11 driven by the motor stator and passing through the upper and lower ends of the motor 100 respectively, and a clamping piece 102 fixedly connected to the upper end of the shaft body 11, and the locking groove 104 is provided on the outside of the clamping piece 102; wherein, in order to realize the replacement of the clamping piece 102, the upper end of the shaft body 11 in this embodiment can be fixedly connected to the clamping piece 102 through a detachable structure; specifically, in this embodiment, the upper end of the shaft body 11 is designed as a column structure, and a vertically arranged anti-rotation plane is provided on the column, and a corresponding column-shaped anti-rotation plane is provided on the clamping piece 102 The clamping hole is provided and a contact plane that is in contact with the anti-rotation plane is provided on the clamping hole. The clamping hole and the column are fixedly connected by interference fit, and the close contact between the anti-rotation plane and the contact plane prevents the clamping member 102 from rotating relative to the shaft body 11; correspondingly, as shown in Figure 11, the clamping member 102 in this embodiment is a lower cylindrical structure, and there are three locking grooves 104 in this embodiment, wherein the locking grooves 104 pass through the clamping member 102 up and down and are evenly arranged on the outside of the clamping member 102; and then when locking the shaft, the locking member 105 is slid inward so that the locking member 105 is clamped into the locking groove 104, thereby limiting the rotation of the clamping member 102 and the shaft body 11.

[0091] As shown in Figures 10 and 13, the connecting channel 12 and the locking member 105 in this embodiment are arranged on a horizontal plane at the center of the vertical rotor 62, so that the locking member 105 moves laterally on the horizontal plane when in use, which makes it easier for the locking member 105 to be stuck into the locking groove 104 when moving; at the same time, when in use, the operator only needs to hold the head of the machine and press the locking member 105 laterally with his thumb, which is more ergonomic and makes the device more convenient to operate.

[0092] Furthermore, in order to facilitate the rapid maintenance and replacement of the clamping member 102, the machine head is divided into two detachable parts in this embodiment; specifically, as shown in Figure 10, the machine head includes a motor housing 1 and a cover plate 2 detachably mounted on the upper end of the motor housing 1; further, as shown in Figures 10 and 13, in order to facilitate the movement of the button end 111 and protect the button end 111, a pressing channel 13 for the inward and outward movement of the button end 111 is provided on the cover plate 2 in this embodiment, and the cover plate 2 is fixed to the upper end of the motor housing 1 by screws in this embodiment; wherein, a through hole for passing the clamping member 102 is provided at the upper end of the motor housing 1, and the cover plate 2 is provided with an inner cavity and covers the outside of the clamping member 102, and the connecting channel 12 is opened on the cover plate 2; as shown in Figure 9, when in use, the motor 100 is partially installed in the motor housing 1, and the clamping member 102 at the upper end of the rotor 62 of the motor 100 passes through the through hole and is located in the cover plate 2, so that in this embodiment, the clamping member 102 can be exposed by simply rotating the cover plate 2 to open it, and then the clamping member 102 can be repaired and replaced, avoiding the need to disassemble the entire machine head, making the device more convenient for inspection and maintenance; wherein, the connecting channel 12 and the locking member 105 can be relatively arranged on one side of the rear side, left side, right side, and front side of the central axis of the cover plate 2.

[0093] As shown in Figure 8, the locking member 105 in this embodiment is arranged on the left side of the cover plate 2; correspondingly, the locking member 105 in this embodiment can be arranged on the right side of the cover plate 2; as shown in Figure 15, the locking member 105 can also be arranged on the front side of the cover plate 2; and then when the shaft lock is required, it is only necessary to hold the head of the power tool with your hand, and it is convenient to press the locking member 105 inward with your fingers, so that the shaft lock operation is convenient. The shaft lock operation can be achieved with one hand, and then the working disk 14 can be replaced with the other hand, so that the operation of replacing the working disk 14 can be completed by one person and is easy to operate.

[0094] Furthermore, as shown in Figure 14, this embodiment also discloses an electric tool that adopts the above-mentioned locking device and handpiece. In addition to adopting the above-mentioned electric tool head, it also includes a handle 3 that is detachably connected to the handpiece and an electronic control system 4 installed on the handle 3 for powering the motor 100; the electronic control system 4 supplies power to the motor 100 so that the motor 100 drives the rotor 62 to rotate, and then drives the working disk 14 to rotate at high speed through the rotor 62; wherein, the working disk 14 can be a grinding disk or a polishing disk, etc., which can be replaced and installed according to work requirements.

[0095] At the same time, in order to facilitate the operator to perform the axis locking operation when holding the handle 3, as shown in Figure 16, the connecting channel 12 and the locking member 105 in this embodiment can be located on the central axis position of the rear end of the cover plate 2, that is, close to the central axis position of the handle 3, and the locking member 105 can move in and out in the connecting channel 12; when locking is required, the operator can push the locking member 105 sideways with his thumb to slide when holding the handle 3 to achieve axis locking, which makes the operation more convenient and flexible.

[0096] Furthermore, when the locking member 105 is designed on the left side, right side or front side of the cover plate 2, in order to facilitate the connection of the wires of the power tool head, a corresponding wire channel can be designed on the motor housing 1. Specifically, as shown in FIG14 , taking the locking member 105 designed on the left side of the cover plate 2 as an example, the motor housing 1 in this embodiment includes a first connecting end 121 connected to the handle 3 and a motor mounting end fixedly connected to the first connecting end 121. The cover plate 2 is installed above the motor mounting end, and a connection is opened on the motor mounting end to connect the inner cavity of the cover plate 2 and the motor. 100 has a wire connection channel 15, and a first connection end 121 is provided with a wire threading channel 16 connecting the interior of the handle 3 and the inner cavity of the cover 2; during installation, the connecting wire on the motor 100 passes through the wire connection channel 15 from the motor housing 1 into the cover 2, and then passes through the inner cavity of the cover 2 into the handle 3 through the wire threading channel 16. The tail of the handle 3 is provided with a mounting seat for installing and connecting the electric control system 4, and the corresponding wire is connected to the circuit connection terminal of the mounting seat, thereby realizing the connection of the power tool circuit after the electric control system 4 is installed.

[0097] Example 3

[0098] As shown in Figures 17 to 24: A locking device and a handpiece of an electric tool, including a handpiece, the handpiece includes a motor housing 1 and a motor 100 in the motor housing 1, the rotor 62 of the motor 100 passes through the top of the motor housing 1 and is fixedly connected to a clamping member 102, and a locking member 105 that cooperates with the clamping member 102 is installed on the side of the clamping member 102 to lock therewith, and a locking mounting portion 10 for mounting the locking member 105 and a protective portion 103 surrounding the outside of the clamping member 102 are provided on the top of the motor housing 1, the protective portion 103 and the locking mounting portion 10 cooperate with each other and form a accommodating groove body 120 on the outside of the clamping member 102.

[0099] The motor housing 1 is the main structure of the direct drive head, which is used to accommodate and protect the internal motor 100 and other components. The motor housing 1 is usually made of metal material to ensure its mechanical strength and durability. The motor 100 is installed inside the motor housing 1 and is responsible for providing rotational power. The rotor 62 of the motor 100 passes through the top of the motor housing 1 and is fixed to the clamping member 102 to ensure that the rotational motion of the rotor 62 can be effectively transmitted to the clamping member 102. The locking member 105 is installed on the side of the clamping member 102 to fix the clamping member 102 to prevent it from loosening during operation. The locking member 105 is locked by the locking mounting portion 10 It is installed and fixed to ensure that it can effectively cooperate with the locking groove 104 of the clip 102 to achieve a stable locking effect. In this embodiment, the locking mounting portion 10 is arranged on the top of the motor housing 1 for installing the locking member 105, and the protective portion 103 surrounds the outside of the clip 102, and the protective portion 103 cooperates with the locking mounting portion 10 to form a accommodating groove body 120 surrounding the outside of the clip 102, which is used to protect the clip 102 and prevent the power cord of the motor from contacting and hanging with the clip, causing damage to the line. In addition, the matching design of the clip 102 and the locking member 105 simplifies the direct-drive head.

[0100] Specifically, as shown in Figures 17 to 19, it also includes a cover plate 2 that is detachably connected to the top of the motor housing 1. A wrapping portion 200 that cooperates with the protective portion 103 and the locking mounting portion 10 is provided at the bottom of the cover plate 2. The wrapping portion 200 is formed with an upper groove body 202 on the inner wall of the cover plate 2 to accommodate the groove body 120 and cooperate with the upper groove body 202 to seal the clip 102.

[0101] The cover plate 2 is detachably connected to the top of the motor casing 1 to further protect the components inside the motor casing 1. The design of the cover plate 2 allows the user to easily disassemble and install it, which is convenient for maintenance and cleaning. In this embodiment, a wrapping portion 200 is provided at the bottom of the cover plate 2 to cooperate with the protective portion 103 and the locking mounting portion 10. The design of the wrapping portion 200 ensures a close fit between the cover plate 2 and the motor casing 1, and enhances the overall sealing. The wrapping portion 200 is formed with an upper groove body 202 on the inner wall of the cover plate 2. The upper groove body 202 cooperates with the accommodating groove body 120 formed by the protective portion 103 and the locking mounting portion 10 to completely seal the clip 102 inside, further improving the protection effect, preventing external dust, water vapor and other pollutants from entering the interior, affecting the performance and life of the clip 102, and improving the stability and reliability of the clip 102. It should be noted that the cover plate 2 adopts a detachable connection method. In this embodiment, it is fixed to the motor casing 1 with screws, which is convenient for users to disassemble and install.

[0102] Specifically, as shown in FIG. 19 and FIG. 23 , a positioning groove 119 is provided on the protective portion 103 , and a downwardly protruding positioning block 201 is formed on the wrapping portion 200 , and the positioning block 201 and the positioning groove 119 are positioned and matched with each other.

[0103] A positioning groove 119 is provided on the protective part 103, and a downwardly protruding positioning block 201 is formed on the wrapping part 200. The positioning block 201 cooperates with the positioning groove 119 to ensure the precise alignment of the cover 2 and the motor housing 1, providing a precise alignment position for the positioning block 201, enhancing the stability and sealing of the structure, and the positioning design makes the installation of the cover 2 more convenient and quick, reduces installation errors, and improves the user's operating convenience. The precise alignment ensures the close fit between the wrapping part 200 and the protective part 103, and further improves the overall sealing of the clamping part 102.

[0104] Furthermore, as shown in Figures 18, 20 and 21, a card slot 118 is provided at the center of the clamping member 102, which runs through the top and bottom thereof. The card slot 118 has a polygonal structure and is clamped to the top of the rotor 62 of the motor 100. A plurality of locking grooves 104 are provided in the circumferential direction of the clamping member 102, and a connecting channel 12 is provided on the locking mounting portion 10. The locking member 105 is slidably arranged in the connecting channel 12 and is on the same horizontal plane as the locking groove 104.

[0105] A card slot 118 is provided at the center of the clamping member 102, which runs through the top and bottom of the clamping member 102. The card slot 118 has a polygonal structure and is clamped with the top of the rotor 62 of the motor 100, ensuring that the rotational movement of the rotor 62 can be effectively transmitted to the clamping member 102, so that the rotor 62 drives the clamping member 102 to rotate synchronously. A number of locking grooves 104 are evenly provided on the circumference of the clamping member 102, which are used to cooperate with the locking member 105 to achieve the fixation of the clamping member 102. A connecting channel 12 is provided on the locking mounting portion 10, and the locking member 105 is slidably arranged through the connecting channel 12 and is on the same horizontal plane as the locking groove 104, ensuring that the locking member 105 can accurately cooperate with the locking groove 104, so that when the locking member 105 slides into the motor 100, it is clamped in the locking groove 104 to limit the rotation of the rotor 62, thereby enhancing the stability of the structure and reducing loosening and deformation caused by long-term use.

[0106] It is worth mentioning that the bottom of the rotor 62 is connected to a working disc via bolts. The working disc may be an angle grinding disc, a grinding disc or a polishing disc.

[0107] Specifically, as shown in FIG19 and FIG22 , the motor housing 1 , the locking mounting portion 10 and the protective portion 103 are integrally formed of a metal material, and the cover plate 2 is made of a heat-insulating material.

[0108] The motor housing 1, the locking mounting portion 10 and the protective portion 103 are integrally formed of metal material, ensuring the consistency and stability of the mechanical properties. This design improves the overall mechanical strength and durability, ensuring the stability of the structure and reliability for long-term use. The cover 2 is made of thermal insulation material to prevent the temperature at the cover 2 from being too high and the user from being burned when touching it. The thermal insulation material can absorb the vibration generated when the motor is running and reduce the vibration of the tool. In this embodiment, the motor housing 1, the locking mounting portion 10 and the protective portion 103 are integrally formed of aluminum alloy material, and the cover is made of thermal insulation plastic. It should be noted that the metal material used for the motor housing 1, the locking mounting portion 10 and the protective portion 103 is not limited to aluminum alloy, but can also be cast iron, stainless steel, etc. The thermal insulation material used for the cover 2 is not limited to plastic, but can also be thermal insulation silicone, etc.

[0109] Furthermore, as shown in Figures 20, 22 and 23, the locking member 105 includes a sliding rod 106 that is slidably connected to the connecting channel 12 and is perpendicular to the rotor 62, a limiting portion 107 that is provided on the inner side of the sliding rod 106 and extends into the inner cavity to engage with the locking groove 104, a latch portion 109 that is provided on the outer side of the sliding rod 106, a button end 111 that is provided with a socket 110 and is connected to the latch portion 109 through the socket 110, and a locking member 111 that is provided on the button end 111 and connected to the locking member 104. The elastic member 114 between the mounting parts 10, wherein the size of the limiting part 107 is larger than the size of the sliding rod 106 and the connecting channel 12, and the end face of the limiting part 107 away from the locking groove 104 is provided with a first limiting surface 108, and the inner side of the locking mounting part 10 is provided with a second limiting surface 116. When the elastic member 114 drives the button end 111 to reset outward, the first limiting surface 108 abuts against the second limiting surface 116, limiting the sliding rod 106 from completely disengaging from the connecting channel 12.

[0110] The sliding rod 106 is slidably connected in the connecting channel 12 of the locking mounting portion 10 to ensure that the locking member 105 can move smoothly. The limiting portion 107 is arranged on the inner side of the sliding rod 106, extending into the inner cavity and engaging with the locking groove 104 to ensure the stable locking of the clamping member 102. The latch portion 109 is arranged on the outer side of the sliding rod 106 for connecting with the button end 111. The button end 111 is provided with a socket 110, which is connected to the latch portion 109 through the socket 110. The user can control the movement of the locking member 105 by pressing the button end 111, thereby limiting the rotation of the rotor 62. The elastic member 114 is arranged between the button end 111 and the locking mounting portion 10. When the button end 111 is released, the elastic member 114 drives the button end 111 When reset outward, the locking member 105 disengages from the locking groove 104, allowing the rotor 62 to resume rotation. In this embodiment, the size of the limiting portion 107 is larger than the size of the sliding rod 106 and the connecting channel 12. The end face of the limiting portion 107 away from the locking groove 104 is provided with a first limiting surface 108, and the inner side of the locking mounting portion 10 is provided with a second limiting surface 116. When the elastic member 114 drives the button end 111 to reset outward, the first limiting surface 108 abuts against the second limiting surface 116, limiting the sliding rod 106 from completely disengaging from the connecting channel 12. Through the above design, the locking member 105 can realize rapid locking and unlocking of the clamping member 102, ensuring that the clamping member 102 will not loosen during operation, thereby improving the convenience and reliability of operation.

[0111] Furthermore, as shown in Figures 17 and 19, the cover plate 2 is provided with a slot 203 on the same side of the motor housing 1 where the locking mounting portion 10 is formed. The slot wall of the slot 203 fits with the top of the motor housing 1 to form a guide channel 204, and the button end 111 is slidably disposed in the guide channel 204.

[0112] A slot 203 is provided on the cover 2, and the position of the slot 203 corresponds to the locking mounting portion 10 on the motor housing 1, ensuring precise alignment of the cover 2 and the motor housing 1. The slot wall of the slot 203 fits with the top of the motor housing 1 to form a guide channel 204, which provides a stable and guiding path for the movement of the button end 111. The button end 111 is slidably arranged in the guide channel 204, ensuring the stability and accuracy of the button end 111 during movement and avoiding offset and jamming.

[0113] Furthermore, as shown in Figure 23, an arc-shaped portion 112 is formed on the inner side of the button end 111, and a guide portion 117 matching the arc-shaped portion 112 is provided on the outer side of the locking mounting portion 10. When the button end 111 moves toward the locking mounting portion 10, the arc-shaped portion 112 and the guide portion 117 are movably abutted.

[0114] An arc-shaped portion 112 is formed on the inner side of the button end 111, which matches the guide portion 117 of the locking mounting portion 10. A guide portion 117 matching the arc-shaped portion 112 is provided on the outer side of the locking mounting portion 10, providing guidance for the movement of the button end. When the button 111 moves toward the locking mounting portion 10, the arc-shaped portion 112 and the guide portion 117 are movably abutted against each other. Under the guidance of the guide portion 117, the user can easily control the movement of the locking member 105, thereby improving the convenience and efficiency of operation.

[0115] Furthermore, as shown in FIG17 , an anti-slip groove 113 is provided on the outer end surface of the button end 111 , and a plurality of anti-slip grooves 113 are symmetrically arranged along the insertion hole 110 to increase the friction force when the button end 111 is pressed inward.

[0116] An anti-slip groove 113 is provided on the outer end surface of the button end 111. Several anti-slip grooves 113 are symmetrically arranged along the socket 110 to increase the friction when the button end 111 is pressed inward. The design of the anti-slip groove 113 increases the friction when the button end 111 is pressed inward, prevents the fingers from slipping, and improves the safety and reliability of the operation.

[0117] As shown in Figures 17 to 26: This embodiment also provides an electric tool, including a direct-drive head on the electric tool, a handle 3 detachably connected to the head structure, and an electronic control system 4 installed on the handle 3 for powering the motor 100; the motor housing 1 includes a first connection end 121 connected to the handle 3; a second connection end 122 integrally formed with the first connection end 121; a wire groove 123 is formed at a position adjacent to the first connection end 121 and the second connection end 122, and a through hole 124 connected to the interior of the handle 3 is provided on the bottom wall of the wire groove 123, and a pair of guide columns 125 for positioning the cover 2 are provided on the second connection end 122, the guide columns 125 are connected to the groove wall of the wire groove 123 on the adjacent side, and an opening area 126 is formed between the two guide columns 125, and a lead channel 127 is also provided on the second connection end 122, and the lead channel 127 is located between the opening area 126 and the locking mounting portion 10.

[0118] The first connection end 121 is connected to the handle 3, ensuring a stable connection between the motor housing 1 and the handle 3. A through hole 124 communicating with the interior of the handle 3 is provided on the bottom wall of the wire groove 123, providing convenience for wiring. A pair of guide posts 125 are provided on the second connection end 122 for positioning the cover 2 to ensure accurate alignment of the cover 2 with the motor housing 1, wrapping the power cord, the locking mounting portion 10, the protective portion 103 and the clip 102, thereby improving the stability of the overall structure. A radial opening area 126 is formed between the two guide posts 125 to provide space for the installation and removal of the cover 2. , which is convenient for users to maintain and clean. The lead channel 127 is located between the opening area 126 and the locking mounting portion 10. As shown in Figure 26, an elastic barrier sleeve that serves as an insulating protection is provided between the motor housing 1 and the motor stator. Three lead pipe openings for leading out the power line are opened on the barrier sleeve along the axial direction of the rotor. The lead pipe openings and the lead channel 127 provide a better path for the wiring of the power line, ensuring that the power line in the electronic control system 4 is extended into the handle and connected to the power line of the motor 100 through the guidance of the through hole 124 and the opening area 126, further ensuring the neatness and safety of the line.

[0119] Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

Claims

1. A power tool head, characterized in that: A motor is provided in the handpiece, and a fan is provided on the outside of the handpiece for blowing air toward the handpiece.

2. The power tool head according to claim 1, wherein: The machine head comprises a front wall and a rear wall of the machine head. Air outlets connected to the rear wall of the machine head are provided on both sides of the machine head. The blowing direction of the fan is toward the rear wall of the machine head.

3. The power tool head according to claim 1, wherein: The motor includes a stator and a rotor, and a motor cavity for installing the motor is provided in the machine head, and the inner peripheral wall of the motor cavity is cooperatively connected with the outer periphery of the stator; six magnets are provided in an annular array on the outer periphery of the rotor; the stator includes a plurality of punching sheets distributed along the annular array, and windings are provided on the punching sheets; the punching sheets are in an I-shaped structure, and a clamping strip and a clamping slot are provided on both sides of the punching sheets respectively; a circuit board is also included, and the circuit board is provided at one axial end of the stator, and the circuit board is connected to the winding; the rotor includes a shaft body, and the shaft body is provided with a thread for installing a tool head.

4. The handpiece of the electric tool according to claim 1, wherein: It also includes a locking device, which includes a locking piece. A connecting channel for passing the locking piece is opened on the side of the head, and one end of the rotor of the motor is provided with a plurality of locking grooves for one end of the locking piece to be clamped.

5. The handpiece of the electric tool according to claim 4, characterized in that: The rotor includes a shaft driven by the motor stator and passing through the upper and lower ends of the motor respectively, and a clamping piece fixedly connected to the upper end of the shaft, and the locking groove is provided on the outside of the clamping piece; the connecting channel and the locking piece are arranged on a horizontal plane perpendicular to the axis of the rotor, and the locking piece slides axially along the connecting channel; the machine head includes a motor housing and a cover plate installed on the upper end of the motor housing, the upper end of the motor housing is provided with a through hole for passing the clamping piece, the cover plate is provided with an inner cavity and covers the outside of the clamping piece, and the connecting channel is provided on the cover plate; the connecting channel and the locking piece are located at the rear side, left side, right side and front side of the central axis of the cover plate one or more sides; the locking member includes a sliding rod slidably connected to the connecting channel, a limiting portion arranged on the inner side of the sliding rod for limiting the sliding rod from completely disengaging from the connecting channel, a button end detachably connected to the outer side of the sliding rod, and an elastic member arranged between the button end and the shell for pushing the button end outward; the cover plate is detachably connected to the motor shell, and a pressing channel for moving the button end inward and outward is provided on the cover plate; a latch portion is provided on the outer side of the sliding rod, and a socket for fixing the latch portion is provided on the button end; a limiting groove is provided on the inner side of the button end, and the side of the elastic member close to the button end is installed in the limiting groove.

6. The handpiece of the electric tool according to claim 4, characterized in that: The machine head includes a motor housing and a cover plate arranged above the motor housing, the rotor of the motor passes through the top of the motor housing and is fixedly connected with a clip, the locking piece is installed on the side of the clip and locked with the clip, the top of the motor housing is provided with a locking mounting portion for installing the locking piece, and the connecting channel is opened on the locking mounting portion; it also includes a protective portion, the protective portion and the locking mounting portion cooperate with each other and form a accommodating groove body on the outside of the clip, the cover plate is detachably connected to the motor housing, and the bottom of the cover plate is provided with a wrapping portion that cooperates with the protective portion and the locking mounting portion, and the wrapping portion is inside the cover plate An upper groove body is formed on the wall, and the accommodating groove body cooperates with the upper groove body and seals the clamping part; a positioning groove is provided on the protective part, and a downwardly protruding positioning block is formed on the wrapping part, and the positioning block and the positioning groove are positioned and matched with each other; a clamping groove is provided at the center position of the clamping part, which passes through the top and bottom of the clamping part, and the clamping groove is polygonal in structure and is clamped with the top of the rotor of the motor, and a plurality of locking grooves are provided on the circumference of the clamping part, and the locking part is slidably arranged in the connecting channel and is on the same horizontal plane as the locking groove; the motor housing, the locking mounting part and the protective part are integrally formed of metal materials, and the cover plate is made of heat insulating material The locking member comprises a sliding rod slidably connected to the connecting channel and perpendicular to the rotor, a limiting portion arranged on the inner side of the sliding rod and extending into the inner cavity to engage with the locking groove, a latch portion arranged on the outer side of the sliding rod, a button end provided with an insertion hole and connected to the latch portion through the insertion hole, and an elastic member arranged between the button end and the locking mounting portion, wherein the size of the limiting portion is larger than the size of the sliding rod and the connecting channel, the end face of the limiting portion away from the locking groove is provided with a first limiting surface, and the inner side of the locking mounting portion is provided with a second limiting surface. When the elastic member drives the button end to reset outward, the The first limiting surface abuts against the second limiting surface, limiting the sliding rod from completely disengaging from the connecting channel; a slot is provided on the cover plate, the slot wall fits with the top of the motor housing to form a guide channel, and the button end is slidably arranged in the guide channel; an arc-shaped portion is formed on the inner side of the button end, and a guide portion matching the arc-shaped portion is provided on the outer side of the locking mounting portion, and when the button end moves toward the locking mounting portion, the arc-shaped portion and the guide portion are movably abutted; an anti-slip groove is provided on the outer end surface of the button end, and several anti-slip grooves are symmetrically arranged along the jack to increase the friction force when the button end is pressed inward.

7. An electric tool comprising the head of the electric tool according to any one of claims 1 to 6, characterized in that: It includes a handle, a left casing, and a right casing. The head is connected to one end of the handle, and the left casing and the right casing are arranged at the other end of the handle. A channel is provided in the handle. The left casing and the right casing are matched to form an internal cavity for accommodating a control circuit. The channel is connected to the internal cavity. An air inlet is provided on the left casing or the right casing; a switch is provided at the front end of the handle.

8. An air duct structure for an electric tool, characterized in that: It includes a head, a handle and a fan, a motor cavity for installing a motor is provided in the head, the head is connected to one end of the handle, the head includes a front wall and a rear wall, and air outlets connected to the rear wall of the head are provided on both sides of the head. The fan is provided in the handle, and the fan blows air toward the rear wall of the head.

9. The air duct structure of the electric tool according to claim 8, characterized in that: The fan is connected to the rear wall of the machine head.

10. The air duct structure of the electric tool according to claim 8, characterized in that: It also includes a left casing and a right casing, wherein the left casing and the right casing are arranged at the other end of the handle, a channel is provided in the handle, one end of the channel faces the rear wall of the head, and the fan is provided at the other end of the channel, or the fan is provided in the left casing and the right casing.

11. The air duct structure of the electric tool according to claim 9 or 10, characterized in that: A channel is provided in the handle, and the left housing and the right housing are matched to form an internal cavity for accommodating the control circuit. The channel is connected to the internal cavity, and an air inlet is provided on the left housing or the right housing.

12. The air duct structure of the electric tool according to claim 8, characterized in that: The motor includes a stator and a rotor, and the inner peripheral wall of the motor cavity is cooperatively connected with the outer periphery of the stator; the outer peripheral annular array of the rotor is provided with six magnets; the stator includes a plurality of punching sheets distributed along the annular array, and windings are provided on the punching sheets; the punching sheets are in an I-shaped structure, and a clamping strip and a clamping slot are provided on both sides of the punching sheets respectively; it also includes a circuit board, which is provided at one axial end of the stator and is connected to the winding; the rotor includes a shaft body, and the shaft body is provided with a thread for installing a tool head.

13. The air duct structure of the electric tool according to claim 8, characterized in that: It also includes a locking device, which includes a locking piece and a motor installed in the machine head. A connecting channel for passing the locking piece is opened on the side of the machine head, and a plurality of locking grooves for one end of the locking piece to be clamped are provided on the rotor of the motor.

14. The air duct structure of the electric tool according to claim 13, characterized in that: The rotor includes a shaft driven by the motor stator and passing through the upper and lower ends of the motor respectively, and a clamping piece fixedly connected to the upper end of the shaft, and the locking groove is provided on the outside of the clamping piece; the connecting channel and the locking piece are arranged on a horizontal plane perpendicular to the axis of the rotor, and the locking piece slides axially along the connecting channel; the machine head includes a motor housing and a cover plate installed on the upper end of the motor housing, the upper end of the motor housing is provided with a through hole for passing the clamping piece, the cover plate is provided with an inner cavity and covers the outside of the clamping piece, and the connecting channel is provided on the cover plate; the connecting channel and the locking piece are located at the rear side, left side, right side and front side of the central axis of the cover plate one or more sides; the locking member includes a sliding rod slidably connected to the connecting channel, a limiting portion arranged on the inner side of the sliding rod for limiting the sliding rod from completely disengaging from the connecting channel, a button end detachably connected to the outer side of the sliding rod, and an elastic member arranged between the button end and the shell for pushing the button end outward; the cover plate is detachably connected to the motor shell, and a pressing channel for moving the button end inward and outward is provided on the cover plate; a latch portion is provided on the outer side of the sliding rod, and a socket for fixing the latch portion is provided on the button end; a limiting groove is provided on the inner side of the button end, and the side of the elastic member close to the button end is installed in the limiting groove.

15. The air duct structure of the electric tool according to claim 13, characterized in that: The machine head includes a motor housing and a cover plate arranged above the motor housing, the rotor of the motor passes through the top of the motor housing and is fixedly connected with a clip, the locking piece is installed on the side of the clip and locked with the clip, the top of the motor housing is provided with a locking mounting portion for installing the locking piece, and the connecting channel is opened on the locking mounting portion; it also includes a protective portion, the protective portion and the locking mounting portion cooperate with each other and form a accommodating groove body on the outside of the clip, the cover plate is detachably connected to the motor housing, and the bottom of the cover plate is provided with a wrapping portion that cooperates with the protective portion and the locking mounting portion, and the wrapping portion is inside the cover plate An upper groove body is formed on the wall, and the accommodating groove body cooperates with the upper groove body and seals the clamping part; a positioning groove is provided on the protective part, and a downwardly protruding positioning block is formed on the wrapping part, and the positioning block and the positioning groove are positioned and matched with each other; a clamping groove is provided at the center position of the clamping part, which passes through the top and bottom of the clamping part, and the clamping groove is polygonal in structure and is clamped with the top of the rotor of the motor, and a plurality of locking grooves are provided on the circumference of the clamping part, and the locking part is slidably arranged in the connecting channel and is on the same horizontal plane as the locking groove; the motor housing, the locking mounting part and the protective part are integrally formed of metal materials, and the cover plate is made of heat insulating material The locking member comprises a sliding rod slidably connected to the connecting channel and perpendicular to the rotor, a limiting portion arranged on the inner side of the sliding rod and extending into the inner cavity to engage with the locking groove, a latch portion arranged on the outer side of the sliding rod, a button end provided with an insertion hole and connected to the latch portion through the insertion hole, and an elastic member arranged between the button end and the locking mounting portion, wherein the size of the limiting portion is larger than the size of the sliding rod and the connecting channel, the end face of the limiting portion away from the locking groove is provided with a first limiting surface, and the inner side of the locking mounting portion is provided with a second limiting surface. When the elastic member drives the button end to reset outward, the The first limiting surface abuts against the second limiting surface, limiting the sliding rod from completely disengaging from the connecting channel; a slot is provided on the cover plate, the slot wall fits with the top of the motor housing to form a guide channel, and the button end is slidably arranged in the guide channel; an arc-shaped portion is formed on the inner side of the button end, and a guide portion matching the arc-shaped portion is provided on the outer side of the locking mounting portion, and when the button end moves toward the locking mounting portion, the arc-shaped portion and the guide portion are movably abutted; an anti-slip groove is provided on the outer end surface of the button end, and several anti-slip grooves are symmetrically arranged along the jack to increase the friction force when the button end is pressed inward.

16. An electric tool comprising the air duct structure of the electric tool according to any one of claims 8 to 15, characterized in that: A switch is provided at the front end of the handle.

17. A locking device for an electric tool, characterized in that: It comprises a locking piece and a motor installed in the machine head. A connecting channel for passing the locking piece is opened on the side of the machine head. A plurality of locking grooves for one end of the locking piece to be clamped in are provided on the rotor of the motor.

18. The locking device of the electric tool according to claim 17, wherein: The rotor includes a shaft body driven by the motor stator and passing through the upper and lower ends of the motor respectively, and a clamping piece fixedly connected to the upper end of the shaft body, and the locking groove is arranged on the outer side of the clamping piece.

19. The locking device of the electric tool according to claim 17, wherein: The connecting channel and the locking member are arranged on a horizontal plane perpendicular to the axis of the rotor, and the locking member slides axially along the connecting channel.

20. The locking device of the electric tool according to claim 17, wherein: The machine head includes a motor housing and a cover plate installed on the upper end of the motor housing. The upper end of the motor housing is provided with a through hole for passing the clamping piece. The cover plate is provided with an inner cavity and covers the outside of the clamping piece. The connecting channel is provided on the cover plate.

21. The locking device of the electric tool according to claim 20, characterized in that: The connecting channel and the locking member are located on one or more sides of the rear side, the left side, the right side and the front side of the central axis of the cover plate.

22. The locking device of the electric tool according to any one of claims 17 to 21, characterized in that: The locking member includes a sliding rod slidably connected in the connecting channel, a limiting portion arranged on the inner side of the sliding rod for limiting the sliding rod from completely escaping from the connecting channel, a button end detachably connected to the outer side of the sliding rod, and an elastic member arranged between the button end and the shell for pushing the button end outward.

23. The locking device of the electric tool according to claim 22, characterized in that: The cover plate is detachably connected to the motor housing, and a pressing channel for moving the button end inward and outward is provided on the cover plate; a latch portion is provided on the outer side of the sliding rod, and a socket for fixing the latch portion is provided on the button end; a limiting groove is provided on the inner side of the button end and is opened on the outer side of the sliding rod, and the side of the elastic member close to the button end is installed in the limiting groove.

24. An electric tool comprising the locking device of any one of claims 17 to 23, characterized in that: It also includes a handle that is detachably connected to the machine head and an electronic control system installed on the handle for powering the motor. The machine head includes a motor housing and a cover installed on the upper end of the motor housing. The motor housing includes a first connecting end connected to the handle and a motor mounting end fixedly connected to the first connecting end. The cover is installed above the motor mounting end. The motor mounting end is provided with a wire connection channel connecting the inner cavity of the cover and the motor. The first connecting end is provided with a wire threading channel connecting the inside of the handle and the inner cavity of the cover.

25. A locking device for an electric tool, characterized in that: It includes a machine head and a motor installed in the machine head, the machine head includes a motor housing and a cover plate arranged above the motor housing, the rotor of the motor passes through the top of the motor housing and is fixed with a clamping piece, the locking piece is installed on the side of the clamping piece and is locked with the clamping piece, and a locking mounting part is provided on the top of the motor housing, and a connecting channel for passing the locking piece is opened on the locking mounting part.

26. The locking device of the electric tool according to claim 25, characterized in that: It also includes a protective part, which cooperates with the locking mounting part to form a receiving groove on the outside of the clip, and the cover plate is detachably connected to the motor housing. A wrapping part that cooperates with the protective part and the locking mounting part is provided at the bottom of the cover plate, and the wrapping part forms an upper groove on the inner wall of the cover plate. The receiving groove cooperates with the upper groove and seals the clip.

27. The locking device of the electric tool according to claim 26, characterized in that: A positioning groove is provided on the protective portion, and a downwardly protruding positioning block is formed on the wrapping portion. The positioning block and the positioning groove are positioned and matched with each other.

28. The locking device of the electric tool according to claim 25 or 26, characterized in that: A slot is provided at the center of the clamping member, which runs through the top and bottom of the clamping member. The slot is polygonal in structure and is clamped to the top of the rotor of the motor. A plurality of locking slots are provided on the circumference of the clamping member. The locking member is slidably arranged in the connecting channel and is on the same horizontal plane as the locking slots.

29. The locking device of the electric tool according to claim 25, characterized in that: The motor housing, the locking mounting portion and the protective portion are integrally formed of metal materials, and the cover plate is made of heat-insulating material.

30. The locking device of the electric tool according to claim 29, wherein: The locking member includes a sliding rod slidably connected in the connecting channel and perpendicular to the rotor, a limiting portion arranged on the inner side of the sliding rod and extending into the inner cavity to engage with the locking groove, a latch portion arranged on the outer side of the sliding rod, a button end provided with an insertion hole and connected to the latch portion through the insertion hole, and an elastic member arranged between the button end and the locking mounting portion, wherein the size of the limiting portion is larger than the size of the sliding rod and the connecting channel, the end face of the limiting portion away from the locking groove is provided with a first limiting surface, and the inner side of the locking mounting portion is provided with a second limiting surface. When the elastic member drives the button end to reset outward, the first limiting surface abuts against the second limiting surface, limiting the sliding rod from completely disengaging from the connecting channel.

31. The locking device of the electric tool according to claim 30, characterized in that: The cover plate is provided with a notch, the notch wall and the top end of the motor housing are fitted together to form a guide channel, and the button end is slidably arranged in the guide channel.

32. The locking device of the electric tool according to claim 30, wherein: An arcuate portion is formed on the inner side of the button end, and a guide portion matching the arcuate portion is provided on the outer side of the locking mounting portion. When the button end moves toward the locking mounting portion, the arcuate portion movably abuts against the guide portion.

33. The locking device of the electric tool according to claim 32, characterized in that: An anti-slip groove is provided on the outer end surface of the button end, and a plurality of the anti-slip grooves are symmetrically arranged along the insertion hole to increase the friction force when the button end is pressed inward.

34. An electric tool comprising the locking device of any one of claims 25 to 34, characterized in that: It also includes a handle detachably connected to the machine head, and an electronic control system installed on the handle for powering the motor; the motor housing includes a first connection end connected to the handle and a second connection end integrally formed with the first connection end; a wire groove is formed at a position adjacent to the first connection end and the second connection end, and a through hole connected to the interior of the handle is provided on the bottom wall of the wire groove, and a pair of guide columns for positioning the cover are provided on the second connection end, and the guide columns are connected to the groove wall of the wire groove on the adjacent side, and an opening area is formed between the two guide columns, and a lead channel is also provided on the second connection end, and the lead channel is located between the opening area and the locking mounting portion.

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