Direct-drive machine head on electric tool and electric tool

Abstract

A direct drive machine head on an electric tool and the electric tool are included, a motor in the machine shell is included, a rotor of the motor penetrates out of the top of the machine shell and is fixedly connected with a clamping piece, a locking piece matched with the clamping piece for locking is installed on the side edge of the clamping piece, and a locking installation part for installing the locking piece and a protection part surrounding the outer side of the clamping piece are arranged on the top of the machine shell. The beneficial effects of the invention are that the housing, the locking installation part and the protection part are integrally formed by adopting a metal material, the consistency and stability of mechanical properties are ensured, the overall protection effect is improved, the structure is simple, the cost is low, the structure is simple, the operation is convenient, and the cost is low. The stability of the clamping piece under the conditions of high load and high-frequency use is improved, and the risk of looseness is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electric tools, and in particular to a direct-drive handpiece on an electric tool and the electric tool. Background Art

[0002] Power tools are tools that use electric motors to drive working parts to work, and are widely used in various industries. Common power tools include grinders, grinders, and polishers. One of the core components of these tools is the direct drive head, which is responsible for transmitting the rotational motion of the motor to the working parts.

[0003] The existing patent publication number is (CN 1118003290A) a direct-drive power tool head with a shaft lock structure and the power tool include a head shell, a motor installed inside the head shell, an output shaft installed in the motor and directly driven by the motor stator, and a working disk detachably installed at the lower end of the output shaft and driven by the output shaft. The output shaft is provided with a plurality of locking grooves, and the side of the head shell is provided with sliding channels corresponding to the locking grooves. The beneficial effect of the invention is: the present invention is provided with a locking member arranged on the side of the head shell, and the locking member is inserted into the locking groove of the output shaft from the side to realize the shaft lock, thereby reducing the height of the head shell, thereby ensuring that the head of the power tool using the power tool can work in a small area.

[0004] The locking member housing and the motor housing (both made of aluminum alloy) in the electric tool head disclosed in the above patent are connected together in a detachable manner. Although this design provides a certain degree of flexibility, under high load or high frequency use, the locking member may become loose, resulting in instability of the tool components, affecting work efficiency and safety, and as described in the patent Figure 2 As shown, the power cord may change position in the chamber due to vibration or movement of the equipment. This position change may cause the power cord to come into contact with the connector or other moving parts, and then be scratched or worn. Damage to the power cord will not only cause the equipment to malfunction, but may also cause electrical failures, increase the risk of damage to the equipment, and even cause safety accidents. Summary of the invention

[0005] The present invention aims to solve the above problems existing in the prior art and provide a direct-drive handpiece and an electric tool with efficient locking and protection functions, which can effectively prevent the loosening of tool parts and damage to the direct-drive handpiece on the electric tool.

[0006] The present invention solves its technical problems by adopting a technical solution: the direct-drive head on this electric tool comprises a casing and a motor in the casing, the rotor of the motor passes through the top of the casing and is fixedly connected to a clamping piece, the side of the clamping piece is equipped with a locking piece that cooperates with it to lock, the top of the casing is provided with a locking mounting portion for installing the locking piece and a protective portion surrounding the outside of the clamping piece, the protective portion and the locking mounting portion cooperate with each other and form a accommodating groove body on the outside of the clamping piece.

[0007] Preferably, it also includes a cover plate detachably connected to the top of the casing, and a wrapping portion cooperating with the protective portion and the locking mounting portion is provided at the bottom of the cover plate, and the wrapping portion forms an upper groove body on the inner wall of the cover plate, and the accommodating groove body cooperates with the upper groove body and seals the clip.

[0008] Preferably, a positioning groove is formed on the protective portion, and a positioning block protruding downward is formed on the wrapping portion, and the positioning block and the positioning groove are positioned and matched with each other.

[0009] Preferably, a card slot is provided at the center of the clamping piece and passes through the top and bottom of the clamping piece. The card slot has a polygonal structure and is clamped with the top of the rotor of the motor. A plurality of locking slots are provided in the circumferential direction of the clamping piece, and a connecting hole is provided on the locking mounting portion. The locking piece is slidably arranged in the connecting hole and is on the same horizontal plane as the locking slot.

[0010] Preferably, the 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.

[0011] Preferably, the locking member includes a sliding rod slidably connected in the connecting hole 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 hole, the end surface 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, thereby limiting the sliding rod from completely disengaging from the connecting hole.

[0012] Preferably, the cover plate is provided with a slot on the same side of the casing where the locking mounting portion is formed, the slot wall of the slot fits with the top of the casing to form a guide channel, and the button end is slidably disposed in the guide channel.

[0013] Preferably, an arc portion is formed on the inner side of the button end, and a guide portion matching the arc portion is provided on the outer side of the locking mounting portion. When the button end moves toward the locking mounting portion, the arc portion and the guide portion movably abut against each other.

[0014] Preferably, an anti-skid groove is arranged on the outer end surface of the button end, and a plurality of the anti-skid grooves are symmetrically arranged along the insertion hole to increase the friction force when the button end is pressed inwardly.

[0015] The present invention solves the above-mentioned technical problems and also provides a direct-drive power tool, including a direct-drive head on the above-mentioned power tool, and also includes a handle detachably connected to the head structure, and an electronic control system installed on the handle for powering the motor; the housing includes a first connection end connected to the handle; 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 formed 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, the guide columns are connected to the groove wall of the wire groove on an 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.

[0016] The present invention has the following beneficial effects: 1. The housing, locking mounting part and protection part are integrally formed of metal materials, which ensures the consistency and stability of mechanical properties, improves the overall protection effect, enhances the stability of the connector under high load and high frequency use, and reduces the risk of loosening.

[0017] 2. The protective part and the locking mounting part cooperate with each other to form a receiving groove around the card connector to prevent the risk of contact between the power cord and the card connector. At the same time, this design effectively prevents external dust and water vapor from entering the interior, protecting the internal structure from pollution and corrosion.

[0018] 3. The cover is made of heat-insulating material, which effectively blocks the heat from being transferred to the top of the direct-drive machine head, preventing users from getting burned when touching it. The cover can also absorb the vibration generated when the motor is running, reducing the vibration of the tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the structure of the direct-drive head in the first embodiment; Figure 2 This is a schematic diagram of the structure of the housing, the locking mounting portion and the protective portion in the first embodiment; Figure 3 is a bottom view of the cover plate in the first embodiment; Figure 4 This is a cross-sectional view of the structure of the direct-drive head in the first embodiment; Figure 5 Schematic diagram of the structure of the rotor and the clamping member in the first embodiment; Figure 6 is a schematic diagram of the structure of the locking member in the first embodiment; Figure 7 This is a schematic diagram of the structure of the locking installation portion and the locking member in the first embodiment; Figure 8 is a top view of the housing in the first embodiment; Fig. 9 is a schematic structural diagram of a direct-drive electric tool in the second embodiment; Fig.10 It is a structural explosion diagram of the direct-drive electric tool in the second embodiment.

[0020] Description of reference numerals: Casing; 10, locking mounting portion; 100, motor; 101, rotor; 102, clamping member; 103, protective portion; 104, locking groove; 105, locking member; 106, sliding rod; 107, limiting portion; 108, accommodating slot; 109, latch portion; 110, jack; 111, button end; 112, arc portion; 113, anti-slip groove; 114, elastic member; 115, connecting hole; 116, second limiting surface; 117, guide portion; 1118, clamping groove; 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; Cover plate; 200, wrapping part; 201, positioning block; 202, upper tank body; 203, notch; 204, guide channel; Grip; 4. Electronic control system. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings: Embodiment 1

[0022] like Figures 1 to 8 As shown: A direct-drive head on an electric tool includes a housing 1 and a motor 100 in the housing 1, a rotor 101 of the motor 100 passes through the top of the housing 1 and is fixedly connected to a clamping piece 102, a locking piece 105 that cooperates with the clamping piece 102 is installed on the side of the clamping piece 102, a locking mounting portion 10 for mounting the locking piece 105 and a protective portion 103 surrounding the outside of the clamping piece 102 are provided on the top of the housing 1, the protective portion 103 cooperates with the locking mounting portion 10 and forms a receiving groove 120 on the outside of the clamping piece 102.

[0023] The housing 1 is the main structure of the direct drive head, which is used to accommodate and protect the motor 100 and other components inside. The housing 1 is usually made of metal materials to ensure its mechanical strength and durability. The motor 100 is installed inside the housing 1 and is responsible for providing rotational power. The rotor 101 of the motor 100 passes through the top of the housing 1 and is fixedly connected to the clamping member 102 to ensure that the rotational motion of the rotor 101 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 inserted into the locking mounting portion 101 through the locking mounting portion 102. 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 at the top of the casing 1 for installing the locking member 105. 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. Moreover, the matching design of the clip 102 and the locking member 105 simplifies the direct-drive head.

[0024] Specifically, Figures 1 to 3 As shown, it also includes a cover plate 2 detachably connected to the top of the casing 1, and 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, and the wrapping portion 200 is formed with an upper groove body 202 on the inner wall of the cover plate 2, which accommodates the groove body 120 and cooperates with the upper groove body 202 to seal the clamping part 102.

[0025] The cover plate 2 is detachably connected to the top of the casing 1 to further protect the components in the 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 the close fit between the cover plate 2 and the 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 and affecting the performance and life of the clip 102, thereby 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 casing 1 with screws to facilitate user disassembly and installation.

[0026] Specifically, Figure 3 and Figure 7As shown, a positioning groove 119 is formed on the protection portion 103 , and a positioning block 201 protruding downward is formed on the wrapping portion 200 , and the positioning block 201 and the positioning groove 119 are positioned and matched with each other.

[0027] 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 casing 1, providing a precise alignment position for the positioning block 201, thereby enhancing the stability and sealing of the structure. 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 clip 102.

[0028] Furthermore, if Figure 2 , Figure 4 and Figure 5 As shown, a card slot 118 is provided at the center of the card connector 102 and passes through the top and bottom thereof. The card slot 118 has a polygonal structure and is engaged with the top of the rotor 101 of the motor 100. A plurality of locking slots 104 are provided in the circumferential direction of the card connector 102. A connecting hole 115 is provided on the locking mounting portion 10. The locking member 105 is slidably disposed in the connecting hole 115 and is on the same horizontal plane as the locking slot 104.

[0029] A card slot 118 is provided at the center of the card connector 102, which runs through the top and bottom of the card connector 102. The card slot 118 has a polygonal structure and is engaged with the top of the rotor 101 of the motor 100, ensuring that the rotational movement of the rotor 101 can be effectively transmitted to the card connector 102, so that the rotor 101 drives the card connector 102 to rotate synchronously. A plurality of locking grooves 104 are evenly provided on the circumference of the card connector 102, which are used to cooperate with the locking member 105 to achieve the fixation of the card connector 102. A connecting hole 115 is provided on the locking mounting portion 10, and the locking member 105 is slidably arranged through the connecting hole 115 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 inserted into the locking groove 104 to limit the rotation of the rotor 101, thereby enhancing the stability of the structure and reducing loosening and deformation caused by long-term use.

[0030] It is worth mentioning that the bottom of the rotor 101 is connected with a working disc via bolts, and the working disc may be an angle grinding disc, a grinding disc or a polishing disc.

[0031] Specifically, Figure 3 and Figure 6 As shown, the housing 1, the locking mounting portion 10 and the protective portion 103 are integrally formed of metal materials, and the cover plate 2 is made of heat-insulating material.

[0032] The casing 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, ensures the stability of the structure and reliability for long-term use, and the cover plate 2 is made of heat-insulating material to prevent the temperature at the cover plate 2 from being too high and the user from being burned when touching it, and the heat-insulating material can absorb the vibration generated when the motor is running and reduce the vibration of the tool. In this embodiment, the casing 1, the locking mounting portion 10 and the protective portion 103 are integrally formed of aluminum alloy material, and the cover plate is made of heat-insulating plastic. It should be noted that the metal material used for the casing 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 heat-insulating material used for the cover plate 2 is not limited to plastic, but can also be heat-insulating silicone, etc.

[0033] Furthermore, if Figure 4 , Figure 6 and Figure 7 As shown, the locking member 105 includes a sliding rod 106 slidably connected in the connecting hole 115 and perpendicular to the rotor 101, a limiting portion 107 arranged on the inner side of the sliding rod 106 and extending into the inner cavity to engage with the locking groove 104, a latch portion 109 arranged on the outer side of the sliding rod 106, a button end 111 provided with a plug hole 110 and connected to the latch portion 109 through the plug hole 110, and an elastic member 114 arranged between the button end 111 and the locking mounting portion 10, wherein the size of the limiting portion 107 is larger than the size of the sliding rod 106 and the connecting hole 115, and the end surface 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 hole 115.

[0034] The sliding rod 106 is slidably connected in the connecting hole 115 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 engaging 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 101. 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 After resetting outward, the locking member 105 disengages from the locking groove 104, allowing the rotor 101 to resume rotation. In the present embodiment, the size of the limiting portion 107 is larger than the size of the sliding rod 106 and the connecting hole 115. The end surface 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 hole 115. Through the above design, the locking member 105 can realize the rapid locking and unlocking of the card connector 102, ensuring that the card connector 102 will not loosen during operation, thereby improving the convenience and reliability of operation.

[0035] Furthermore, if Figure 1 and Figure 3 As shown, the cover plate 2 is provided with a slot 203 on the same side of the housing 1 as the locking mounting portion 10 , the slot wall of the slot 203 fits with the top of the housing 1 to form a guide channel 204 , and the button end 111 is slidably disposed in the guide channel 204 .

[0036] A slot 203 is provided on the cover plate 2, and the position of the slot 203 corresponds to the locking mounting portion 10 on the casing 1, thereby ensuring the precise alignment of the cover plate 2 with the casing 1. The slot wall of the slot 203 fits with the top of the casing 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, thereby ensuring the stability and accuracy of the button end 111 during movement and avoiding deviation and jamming.

[0037] Furthermore, if Figure 7 As shown, an arc portion 112 is formed on the inner side of the button end 111, and a guide portion 117 matching the arc 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 portion 112 and the guide portion 117 are movably pressed against each other.

[0038] An arc-shaped portion 112 is formed on the inner side of the button end 111 and matches with the guide portion 117 of the locking mounting portion 10. A guide portion 117 matching with the arc-shaped portion 112 is provided on the outer side of the locking mounting portion 10 to provide 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.

[0039] Furthermore, if Figure 1 As shown, an anti-skid groove 113 is arranged on the outer end surface of the button end 111, and a plurality of anti-skid grooves 113 are symmetrically arranged along the insertion hole 110 to increase the friction force when the button end 111 is pressed inward.

[0040] An anti-skid groove 113 is provided on the outer end surface of the button end 111. Several anti-skid grooves 113 are symmetrically arranged along the socket 110 to increase the friction force when the button end 111 is pressed inward. The design of the anti-skid groove 113 increases the friction force when the button end 111 is pressed inward, prevents fingers from sliding, and improves the safety and reliability of operation. Embodiment 2

[0041] like Figures 1 to 10 As shown: The present invention also provides a direct-drive power tool, including the direct-drive head on the power tool of embodiment 1, and also including a handle 3 detachably connected to the head structure, and an electric control system 4 installed on the handle 3 for powering the motor 100; the 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 formed on the bottom wall of the wire groove 123, and a pair of guide columns 125 for positioning the cover plate 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 opened on the second connection end 122, and the lead channel 127 is located between the opening area 126 and the locking mounting portion 10.

[0042] The first connection end 121 is connected to the handle 3 to ensure a stable connection between the housing 1 and the handle 3. A through hole 124 connected to the inside of the handle 3 is provided on the bottom wall of the wire groove 123, which provides 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 housing 1, wrapping the power cord, the locking mounting portion 10, the protective portion 103 and the clamping member 102 therein, thereby improving the stability of the overall structure. A radial opening area 126 is formed between the two guide posts 125, which provides space for the installation and removal of the cover 2 and facilitates maintenance and cleaning by users. The lead-in channel 127 is located between the opening area 126 and the locking mounting portion 10. Fig.10 An elastic barrier sleeve that serves as an insulating protection is arranged between the housing 1 and the motor stator. Three lead-in pipe openings for leading out the power line are opened on the barrier sleeve along the axial direction of the rotor. The lead-in pipe openings and the lead-in channel 127 provide a better path for the wiring of the power line, ensuring that the power line in the electronic control system 4 extends into the handle and is 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.

[0043] Certain words are used in the specification and claims of the present invention to refer to specific products. It should be understood by those skilled in the art that manufacturers may refer to the same component by different names. It is not intended to distinguish between components that have the same function but different names. In the following specification and patent scope, the words "comprise", "have" and "include" are open-ended words and should be interpreted as "including but not limited to...".

[0044] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A direct-drive head for an electric tool, comprising a housing and a motor in the housing, wherein the rotor of the motor passes through the top of the housing and is fixedly connected to a clamping piece, and a locking piece for locking with the clamping piece is installed on the side of the clamping piece, wherein the feature is that: The top of the housing is provided with a locking installation portion for installing the locking piece and a protective portion surrounding the outside of the clamping piece. The protective portion and the locking installation portion cooperate with each other to form a receiving groove body on the outside of the clamping piece.

2. The direct-drive handpiece of the electric tool according to claim 1, characterized in that: It also includes a cover plate detachably connected to the top of the casing, wherein a wrapping portion cooperating with the protective portion and the locking mounting portion is provided at the bottom of the cover plate, and an upper groove body is formed on the inner wall of the cover plate by the wrapping portion, and the accommodating groove body cooperates with the upper groove body and seals the clip.

3. The direct-drive handpiece of the electric tool according to claim 2, characterized in that: The protective portion is provided with a positioning groove, and the wrapping portion is formed with a positioning block protruding downward, and the positioning block and the positioning groove are positioned and matched with each other.

4. A direct-drive handpiece for an electric tool according to claim 1 or 2, characterized in that: A slot penetrating the top and bottom of the clamping piece is provided at the center of the clamping piece. The slot is a polygonal structure and is clamped with the top of the rotor of the motor. A plurality of locking slots are provided in the circumferential direction of the clamping piece. A connecting hole is provided on the locking mounting portion. The locking piece is slidably arranged in the connecting hole and is on the same horizontal plane as the locking slot.

5. A direct-drive handpiece for an electric tool according to claim 1, 2, 3 or 4, characterized in that: The housing, the locking mounting portion and the protection portion are integrally formed of metal materials, and the cover plate is made of heat-insulating material.

6. The direct-drive handpiece of the electric tool according to claim 5, characterized in that: The locking member includes a sliding rod slidably connected in the connecting hole 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 hole, the end surface 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 hole.

7. The direct-drive handpiece of the electric tool according to claim 6, characterized in that: The cover plate is provided with a slot on the same side of the casing where the locking mounting portion is formed, and the slot wall of the slot fits with the top of the casing to form a guide channel, and the button end is slidably arranged in the guide channel.

8. The direct-drive handpiece of the electric tool according to claim 6, characterized in that: An arc portion is formed on the inner side of the button end, and a guide portion matching the arc portion is arranged on the outer side of the locking mounting portion. When the button end moves toward the locking mounting portion, the arc portion and the guide portion movably abut against each other.

9. The direct-drive handpiece of the electric tool according to claim 8, characterized in that: An anti-skid groove is arranged on the outer end surface of the button end, and a plurality of the anti-skid grooves are symmetrically arranged along the insertion hole to increase the friction force when the button end is pressed inwardly.

10. A direct-drive electric tool, comprising a direct-drive handpiece according to claim 9, wherein: It also includes a handle detachably connected to the head structure, and an electronic control system installed on the handle for powering the motor; the housing includes a first connection end connected to the handle; 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, a through hole connected to the interior of the handle is formed on the bottom wall of the wire groove, a pair of guide columns for positioning the cover plate are provided on the second connection end, the guide columns are connected to the groove wall of the wire groove on an 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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