Electric grinder

Abstract

The utility model relates to the technical field of electric grinding machines, and discloses an electric grinding machine which comprises a shell, a driving motor, a main shaft and a grinding tool chuck. A containing cavity is formed in the shell, and the driving motor is located in the containing cavity and fixedly connected with the shell. The driving motor comprises a motor shell, a motor bearing and a motor body, an opening is formed in one side of the motor shell, the motor bearing is located in the opening, and the outer ring of the motor bearing is connected with the inner wall of the motor shell; a first end of the main shaft extends into an inner ring of the motor bearing and is connected with an output shaft in the motor main body, a second end of the main shaft is connected with the grinding tool chuck, and the first end is opposite to the second end. According to the electric grinding machine, the coaxiality of the motor and the main shaft is improved, and vibration generated on the motor and the main shaft can be reduced.

Description

Technical Field

[0001] This application relates to the technical field of electric grinders, and particularly to an electric grinder. Background Art

[0002] The interior of an electric grinder has a driving motor, and the output shaft of the driving motor can be connected to accessories such as drill bits, milling cutters, grinding wheels, grinding heads, grinding wheels, and cutting discs through different types of tool chucks to perform grinding operations on different types of objects to be ground.

[0003] The rotational speed of the driving motor inside the electric grinder is as high as several thousand revolutions per minute or even tens of thousands of revolutions per minute. Therefore, during the grinding operation, the driving motor and other components inside the electric grinder will generate relatively strong vibrations.

[0004] During long-term use, the vibrations will damage the driving motor and the circuits inside the electric grinder, and will also cause the user's palm to become numb, thereby affecting the precision and efficiency of grinding. Summary of the Utility Model

[0005] In view of this, this application provides an electric grinder, which improves the coaxiality of the motor and the main shaft and can reduce the vibrations generated on the motor and the main shaft.

[0006] Specifically, this application includes the following technical solutions:

[0007] In a first aspect of this application, there is provided an electric grinder, which includes a housing, a driving motor, a main shaft, and a tool chuck;

[0008] The interior of the housing has a receiving cavity, the driving motor is located in the receiving cavity and is fixedly connected to the housing;

[0009] The driving motor includes a motor housing, a motor bearing, and a motor body. One side of the motor housing has an opening, the motor bearing is located in the opening, and the outer ring of the motor bearing is connected to the inner wall of the motor housing;

[0010] The first end of the main shaft extends into the inner ring of the motor bearing and is connected to the output shaft in the motor body. The second end of the main shaft is connected to the tool chuck, and the first end and the second end are opposite to each other.

[0011] Optionally, the driving motor further includes a snap ring, the snap ring is fixedly sleeved on the main shaft, the snap ring is located on the side of the motor bearing away from the tool chuck and abuts against the motor bearing.

[0012] Optionally, the first end of the main shaft is provided with a first connection hole, and one end of the output shaft is fixed in the first connection hole;

[0013] A second connection hole is formed at the second end of the main shaft, one end of the grinding tool chuck is fixed in the second connection hole, and the second connection hole communicates with the first connection hole.

[0014] Optionally, the electric grinder further includes at least one first annular damping member, the at least one first annular damping member is an elastic member, sleeved on the motor housing, and the at least one first annular damping member is connected to or abuts against the inner wall of the accommodation cavity.

[0015] Optionally, the number of the first annular damping members is two, and the two first annular damping members are respectively located on opposite sides of the drive motor along the axial direction.

[0016] Optionally, the electric grinder further includes a bearing and a second annular damping member;

[0017] The bearing is sleeved on the outer wall of the main shaft;

[0018] The second annular damping member is an elastic member, sleeved on the outer ring of the bearing, and connected to or abuts against the inner wall of the accommodation cavity.

[0019] Optionally, the bearing is slidably connected to the main shaft.

[0020] Optionally, the electric grinder further includes a third annular damping member, the third annular damping member is sleeved on the outer wall of the housing, and is located on a side of the housing close to the grinding tool chuck, wherein the third annular damping member is an elastic member.

[0021] Optionally, the electric grinder further includes a key, a switch board and an elastic damping member;

[0022] The switch board is located in the accommodation cavity and is electrically connected to the drive motor;

[0023] An installation hole is formed through the housing, at least part of the key is located in the installation hole and can reciprocate along the axial direction of the installation hole, and the key is used to press the switch board to control the drive motor to be turned on or off;

[0024] The elastic damping member is located between the switch board and the key, and is respectively connected to or abuts against the switch board and the key.

[0025] Optionally, the electric grinder further includes a first bracket and a second bracket;

[0026] The cross-sectional shapes of the first bracket and the second bracket are both semi-circular, and a cavity is formed inside after the first bracket and the second bracket are buckled, wherein the cross-section is perpendicular to the axial direction of the drive motor;

[0027] The driving motor and the first annular damping member are located in the cavity, and the first annular damping member abuts against the inner wall of the cavity. The housing is sleeved outside the first bracket and the second bracket, and the inner wall of the accommodating cavity is respectively connected to the outer walls of the first bracket and the second bracket.

[0028] Optionally, the electric grinder further includes a first main board and a second main board. The first main board and the second main board are stacked in a direction perpendicular to the axial direction of the driving motor, and the first main board and the second main board are arranged at intervals, wherein the first main board and the second main board are electrically connected.

[0029] Optionally, the side of the first main board facing away from the second main board faces the first bracket;

[0030] A first notch is formed on the edge of the first main board. A first limiting member is arranged on the first bracket. The first limiting member passes through the first notch and abuts against the second main board;

[0031] A second notch is formed on the edge of the second main board. The orthographic projection of the second notch on the projection plane is located inside the orthographic projection of the first notch on the projection plane. The projection plane is parallel to the surface of the first main board facing the second main board;

[0032] A second limiting member is arranged on the second bracket. At least part of the second limiting member extends into the second notch.

[0033] Optionally, a charging socket is arranged on the second main board. The charging socket is vertically connected to the surface of the second main board facing away from the first main board;

[0034] A through hole is formed on the second bracket. The charging socket passes through the through hole and is exposed outside the second bracket, wherein the shape of the through hole is adapted to the shape of the charging socket.

[0035] The beneficial effects of the technical solution provided by the embodiment of the present application at least include:

[0036] In the electric grinder provided by the embodiment of the present application, the motor housing of the driving motor has an opening, the motor bearing is arranged in the opening, the main shaft passes through the motor bearing and extends into the interior of the motor housing, and is connected to the output shaft of the motor body. When the output shaft rotates, it drives the main shaft to rotate, and the main shaft drives the grinding tool chuck to rotate, thereby performing a grinding operation on the component to be ground. Since the first end of the main shaft penetrates through the motor bearing, it is equivalent to reducing the length of the main shaft exposed outside the driving motor, and thus can reduce the probability of the axis of the main shaft and the axis of the output shaft deviating. Moreover, the outer ring of the motor bearing abuts against the inner wall of the motor housing, and the axis of the motor bearing coincides with the axis of the motor housing, that is, the axis of the motor bearing coincides with the axis of the output shaft. The main shaft penetrates through the motor bearing, and the outer ring and the inner ring of the motor bearing are concentric, that is, the axis of the main shaft coincides with the axis of the output shaft, improving the coaxiality of the main shaft and the output shaft. The vibration generated on the main shaft and the output shaft is also correspondingly reduced, and finally the vibration transmitted to the user's palm will also be reduced, thereby avoiding the problem that the user's hand goes numb due to the vibration generated by the driving motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0038] Figure 1 shows a schematic structural diagram of the electric grinder provided by the embodiment of the present application;

[0039] Figure 2 shows an exploded view of an electric grinder provided by the embodiment of the present application;

[0040] Figure 3 shows a cross-sectional view of the main shaft and the driving motor provided by the embodiment of the present application;

[0041] Figure 4 shows a cross-sectional view of an electric grinder provided by the embodiment of the present application;

[0042] Figure 5 shows another exploded view of an electric grinder provided by the embodiment of the present application;

[0043] Figure 6 shows an exploded view of the grinding tool chuck, the main shaft, the bearing, the second annular damping member, and the driving motor provided by the embodiment of the present application;

[0044] Figure 7 shows an exploded view of the housing and the third annular damping member provided by the embodiment of the present application;

[0045] Figure 8 Shows a partial explosion diagram of a electric grinding machine provided by an embodiment of the present application;

[0046] Figure 9 Is Figure 5 The enlarged view of part A in;

[0047] Figure 10 Shows the structural schematic diagram of the second bracket provided by an embodiment of the present application;

[0048] Figure 11 Shows the cross-sectional view of another electric grinding machine provided by an embodiment of the present application;

[0049] Figure 12 Shows a partial explosion diagram of yet another electric grinding machine provided by an embodiment of the present application;

[0050] Figure 13 Is Figure 6 The enlarged view of part B in. Description of the drawings:

[0052] 1. Housing; 11. Accommodating cavity; 12. Mounting hole; 13. First part; 14. Second part; 15. Limiting structure;

[0053] 2. Driving motor; 21. Motor housing; 211. Opening; 22. Motor bearing; 23. Motor main body; 231. Output shaft; 24. Snap ring;

[0054] 3. Spindle; 31. First connection hole; 32. Second connection hole;

[0055] 4. Grinding tool chuck; 41. Groove; 42. Arc section;

[0056] 5. First annular damping member;

[0057] 6. Bearing; 7. Second annular damping member;

[0058] 8. Third annular damping member;

[0059] 9. Button; 10. Switch board; 101. Elastic damping member;

[0060] 102. First bracket; 1021. First limiting member;

[0061] 103. Second bracket; 1031. Second limiting member; 1032. Through hole;

[0062] 104. First main board; 1041. First notch;

[0063] 105. Second main board; 1051. Second notch; 1052. Charging socket;

[0064] 106. Self-locking nut; 107. Upper nut; 108. Stepless speed change knob.

[0065] Through the above-mentioned drawings, specific embodiments of the present application have been shown, and there will be more detailed descriptions hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Detailed implementation manners

[0066] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application. To make the technical solutions and advantages of the present application clearer, the electric grinder will be described in detail below in conjunction with the drawings.

[0067] The interior of the electric grinder has a drive motor, and the output shaft of the drive motor can be connected to accessories such as drill bits, milling cutters, grinding wheels, polishing heads, grinding wheels, and cutting discs through different types of chucks to perform grinding operations on different types of objects to be ground. The rotational speed of the drive motor inside the electric grinder is as high as several thousand revolutions per minute or even tens of thousands of revolutions per minute. Therefore, when performing grinding operations, the drive motor and other components inside the electric grinder will generate relatively strong vibrations.

[0068] In the electric grinder in the related art, the output shaft of the drive motor is exposed outside the drive motor. The main shaft is connected to the output shaft and has a certain interval from the drive motor. The distance between the grinding tool chuck and the output shaft is relatively long, increasing the probability that the axis of the main shaft and the axis of the output shaft deviate from each other. When the axes of the main shaft and the output shaft are not collinear, the generated vibration will increase, and the generated vibration will be transmitted to the outer shell. When the user operates, the palm needs to be in contact with the outer shell at all times. During long-term use, the vibration will cause the user's palm to become numb, thereby affecting the grinding accuracy and efficiency, and may also damage the drive motor and the circuit inside the electric grinder.

[0069] In response to this, the present application provides an electric grinder, such as Figure 1 、 Figure 2 and Figure 3As shown, the electric grinder may include a housing 1, a drive motor 2, a main shaft 3, and a tool chuck 4; an accommodation cavity 11 is provided inside the housing 1, the drive motor 2 is located in the accommodation cavity 11 and is fixedly connected to the housing 1; the drive motor 2 includes a motor housing 21, a motor bearing 22, and a motor body 23. An opening 211 is provided on one side of the motor housing 21, the motor bearing 22 is located in the opening 211, and the outer ring of the motor bearing 22 is connected to the inner wall of the motor housing 21; the first end of the main shaft 3 extends into the inner ring of the motor bearing 22 and is connected to the output shaft 231 in the motor body 23. The second end of the main shaft 3 is connected to the tool chuck 4, and the first end and the second end are opposite to each other.

[0070] In the electric grinder provided in the embodiment of the present application, an opening 211 is provided on the motor housing 21 of the drive motor 2, the motor bearing 22 is arranged in the opening 211, the main shaft 3 passes through the motor bearing 22 and extends into the interior of the motor housing 21 and is connected to the output shaft 231 of the motor body 23. When the output shaft 231 rotates, it drives the main shaft 3 to rotate, and the main shaft 3 drives the tool chuck 4 to rotate, thereby performing a grinding operation on the component to be ground. Since the first end of the main shaft 3 is inserted through the motor bearing 22, it is equivalent to reducing the distance between the tool chuck 4 and the output shaft 231, thereby reducing the probability that the axes of the main shaft 3 and the output shaft 231 generate an offset angle. And the outer ring of the motor bearing 22 abuts against the inner wall of the motor housing 21, and the axis of the motor bearing 22 coincides with the axis of the motor housing 21, that is, the axis of the motor bearing 22 coincides with the axis of the output shaft 231. The main shaft 3 is inserted through the motor bearing 22, and the outer ring and the inner ring of the motor bearing 22 are concentric, that is, the axis of the main shaft 3 coincides with the axis of the output shaft 231, improving the coaxiality of the main shaft 3 and the output shaft 231, and the vibration generated on the main shaft 3 and the output shaft 231 is also correspondingly reduced, and finally the vibration transmitted to the user's palm is also reduced, thereby avoiding the problem that the user's hand goes numb due to the vibration generated by the drive motor 2.

[0071] In some embodiments of the present application, as Figure 3 shown, the drive motor 2 may further include a snap ring 24, the snap ring 24 is fixedly sleeved on the main shaft 3, the snap ring 24 is located on the side of the motor bearing 22 away from the tool chuck 4 and abuts against the motor bearing 22.

[0072] By fixedly arranging the snap ring 24 on the main shaft 3, when the main shaft 3 has a tendency to move in the direction towards the tool chuck 4 under an external force, the snap ring 24 abuts against the motor bearing 22, and can limit the main shaft 3 in the axial direction of its axis.

[0073] In some embodiments, as Figure 4As shown, a limiting structure 15 may be provided on the inner wall of the housing 1. The limiting structure 15 is respectively in contact with the end face of the motor housing 21 close to one side of the main shaft 3 and the motor bearing 22, so as to cooperate with the snap ring 24 to limit the motor bearing 22 in the direction of its axis.

[0074] In some embodiments of the present application, as Figure 3 shown, a first connection hole 31 is provided at the first end of the main shaft 3, and one end of the output shaft 231 is fixed in the first connection hole 31; a second connection hole 32 is provided at the second end of the main shaft 3, and one end of the grinding tool chuck 4 is fixed in the second connection hole 32, and the second connection hole 32 communicates with the first connection hole 31.

[0075] When assembling the main shaft 3, the drive motor 2 and the grinding tool chuck 4, generally, the main shaft 3 is first connected to the output shaft 231 of the drive motor 2, and then the grinding tool chuck 4 is connected to the main shaft 3. When the output shaft 231 extends into the first connection hole 31 on the main shaft 3, the gas inside the first connection hole 31 will be compressed. At this time, if the first connection hole 31 is not communicated with the outside world, the air pressure formed by the gas will press the internal structure of the main shaft 3, and it is also difficult for the output shaft 231 to be assembled in place.

[0076] Therefore, in the electric grinder provided by the embodiments of the present application, the second connection hole 32 on the main shaft 3 for installing the grinding tool chuck 4 communicates with the first connection hole 31. When connecting the output shaft 231 and the main shaft 3, the gas in the first connection hole 31 can be discharged to the outside through the second connection hole 32, protecting the internal structure of the main shaft 3 and making the assembly easier.

[0077] In some embodiments, as Figure 3 shown, a chamfer is provided on the inner wall of the first connection hole 31 on the side far from the second connection hole 32. The slope on the chamfer is inclined such that the closer it is to the second connection hole 32, the closer it is to the axis of the first connection hole 31. By providing the chamfer, the grinding tool chuck 4 can be clamped more tightly when installed, avoiding relative movement between the grinding tool chuck 4 and the main shaft 3 during grinding.

[0078] Optionally, the angle between the slope and the outer wall of the main shaft 3 is 40° - 70°. Exemplarily, the angle is 60°.

[0079] In some embodiments of the present application, as Figure 2 and Figure 3 shown, the electric grinder may include at least one first annular damping member 5. The at least one first annular damping member 5 is an elastic member and is sleeved on the motor housing, and the at least one first annular damping member 5 is connected to or abuts against the inner wall of the accommodation cavity 11.

[0080] In the electric grinder provided by the embodiments of the present application, the first annular damping member 5 is sleeved between the drive motor 2 and the housing 1 that houses the drive motor 2. Since the first annular damping member 5 is an elastic member, it can deform when the drive motor 2 vibrates during operation to absorb part of the vibration energy, thereby playing a role in damping, weakening the vibration transmitted from the drive motor 2 to the housing 1, and reducing the impact of the vibration on other components inside the housing 1. In addition, since the vibration transmitted from the drive motor 2 to the housing 1 is reduced, the vibration transmitted from the housing 1 to the user's palm is also correspondingly reduced, thereby avoiding the problem of the user's hand going numb due to the vibration generated by the drive motor 2, and also avoiding the impact of the vibration of the drive motor 2 on the grinding efficiency and grinding accuracy, etc.

[0081] In some embodiments, the drive motor 2 can be connected to the tool chuck 4 through an output shaft. The tool chuck 4 is used to hold tools such as drill bits, milling cutters, grinding wheels, grinding heads, grinding wheels, and cutting discs. The drive motor 2 can drive the tool chuck 4 to rotate, and the tool chuck 4 drives the tool to rotate, thereby performing a grinding operation on the object to be ground.

[0082] In some embodiments, the outer shell of the drive motor 2 is cylindrical, and the housing 1 and the accommodation cavity 11 are also cylindrical. The first annular damping member 5 is sleeved on the cylindrical outer shell of the drive motor 2 and is connected or abutted against the inner wall of the accommodation cavity 11. In a cross-section perpendicular to the output shaft of the drive motor 2, the cross-sections of the motor outer shell 21, the first annular damping member 5, and the housing 1 are all circular, and the centers of the circles coincide. In this way, the axes of the output shaft of the drive motor 2 and the tool chuck 4 are both on the same straight line, thereby avoiding the aggravation of vibration caused by the angle between the output shaft of the drive motor 2 and the tool chuck.

[0083] In some embodiments, the housing 1 is a metal shell to increase the structural strength of the electric grinder. Exemplarily, the housing 1 is an aluminum shell or a steel shell.

[0084] In some embodiments, the number of the first annular damping members 5 is one and is sleeved on the outer shell of the drive motor 2, and the distances between the first annular damping member 5 and the edges on the opposite sides of the drive motor 2 along the axial direction are equal to avoid the drive motor 2 tilting under the action of gravity and causing the aggravation of vibration. This axial direction can be, for example, the extending direction of the output shaft of the drive motor 2.

[0085] In some embodiments, the first annular damping member 5 can extend along the axial direction of the drive motor 2 to be integrally cylindrical. And the length of the first annular damping member 5 along the axial direction of the drive motor 2 can be basically equal to the length of the outer shell of the drive motor 2. Thus, after the first annular damping member 5 is sleeved on the outer shell of the drive motor 2, it can basically cover the entire outer shell of the first annular damping member 5, which reduces the requirement for the installation position accuracy of the first annular damping member 5.

[0086] In some embodiments, as Figure 5 shown, the number of the first annular damping members 5 may be two, and the two first annular damping members 5 are respectively located on opposite sides of the driving motor 2 along the axial direction.

[0087] In the electric grinder provided in the embodiment of the present application, the first annular damping members 5 are symmetrically arranged on both sides of the driving motor 2, which can not only ensure that the driving motor 2 will not generate an angular offset with the tool chuck 4 due to the arrangement of the first annular damping members 5, but also is lighter in weight compared with the cylindrical first annular damping members 5.

[0088] In some embodiments, the number of the first annular damping members 5 may be multiple, and the multiple first annular damping members 5 are sleeved on the outer shell of the driving motor 2 at intervals along the axial direction. Those skilled in the art can select and adjust the number and size of the first annular damping members 5 according to actual needs.

[0089] Optionally, the first annular damping member 5 is any one of a soft rubber damping member, a rubber damping member and a sponge damping member. Those skilled in the art can select and adjust the type of the first annular damping member 5 according to actual needs.

[0090] In one implementation manner of the embodiment of the present application, as Figure 5 and Figure 6 shown, the electric grinder may further include a bearing 6 and a second annular damping member 7; the bearing 6 is sleeved on the outer wall of the main shaft 3; the second annular damping member 7 is an elastic member, sleeved on the outer ring of the bearing 6, and is connected to or abuts against the inner wall of the accommodating cavity 11.

[0091] Since the output shaft of the driving motor 2 is relatively thin, if the tool chuck 4 is directly connected to the output shaft of the driving motor 2, the output shaft will be subjected to a shearing force during the grinding process and is easily damaged. Therefore, a main shaft 3 can be additionally arranged between the output shaft and the tool chuck 4 to connect the output shaft of the driving motor 2 and the tool chuck 4, so as to reduce the damage to the output shaft of the driving motor 2.

[0092] The main shaft 3 is connected to the inner ring of the bearing 6. When the output shaft of the driving motor 2 drives the main shaft 3 to rotate, the main shaft 3 can rotate along with the output shaft and drive the inner ring of the bearing 6 to rotate. However, the outer ring of the bearing 6 is connected to or abuts against the inner wall of the accommodation cavity 11 through the second annular damping member 7. The second annular damping member 7 can act as the bearing 6, so that the outer ring of the bearing 6 does not rotate relative to the inner wall of the accommodation cavity 11. Even if the vibration generated by the driving motor 2 is transmitted to the housing 1 through the bearing 6, the second annular damping member 7 provided between the outer ring of the bearing 6 and the inner wall of the accommodation cavity 11 can absorb the vibration energy through deformation, thereby weakening the vibration transmitted from the bearing 6 to the housing 1, avoiding the user's hand numbness due to vibration, and giving the user a better use experience.

[0093] Optionally, the second annular damping member 7 is any one of a soft rubber damping member, a rubber damping member, and a sponge damping member. Those skilled in the art can select and adjust the type of the second annular damping member 7 according to actual needs.

[0094] In an implementation manner of the embodiment of the present application, the bearing 6 is slidably connected to the main shaft 3.

[0095] It should be noted that the sliding fit is a type of clearance fit. The bearing 6 is slidably connected to the main shaft 3, so that the main shaft 3 can drive the inner ring of the bearing 6 to rotate, but it is not in a tight fit with the inner ring of the bearing 6, thereby avoiding the bearing 6 from extruding the outer wall of the main shaft 3 and preventing the main shaft 3 from being damaged, and improving the service life of the main shaft 3.

[0096] In an implementation manner of the embodiment of the present application, as Figure 1 and Figure 5 shown, the electric grinder may further include a third annular damping member 8. The third annular damping member 8 is sleeved on the outer wall of the housing 1 and is located on the side of the housing 1 close to the tool holder 4, wherein the third annular damping member 8 is an elastic member.

[0097] In the electric grinder provided in the embodiment of the present application, a third annular damping member 8 may also be sleeved on the housing 1. When the user holds the electric grinder, the user's palm just contacts the third annular damping member 8. The vibration generated by the driving motor 2 is first damped by the first annular damping member 5 and then transmitted to the housing 1, and then damped by the third annular damping member 8 and then transmitted to the user's hand, further weakening the vibration transmitted to the user's palm, avoiding the negative impact of the vibration generated by the driving motor 2 on the user's palm, and improving the grinding accuracy and grinding efficiency.

[0098] In some embodiments, as Figure 7As shown, the housing 1 may include a connected first part 13 and a second part 14. The first part 13 is closer to the tool chuck 4 than the second part 14. The outer diameter of the first part 13 is smaller than that of the second part 14. The third annular damping member 8 is sleeved on the outer wall of the first part 13, and the outer diameter of the third annular damping member 8 is equal to the outer diameter of the second part 14. The first part 13 and the second part 14 may be coaxially arranged. In this way, the part of the second part 14 protruding circumferentially from the first part 13 can serve as a limiting structure to restrict the movement of the third annular damping member 8 and prevent it from detaching from the first part 13.

[0099] In some embodiments, the first part 13 and the second part 14 are two separate components, and the first part 13 and the second part 14 are detachably connected. After the first part 13 is disassembled, it is more convenient to operate components such as the drive motor 2.

[0100] In some embodiments, a plurality of anti-slip protrusions are provided on the outer peripheral wall of the third annular damping member 8. The plurality of anti-slip protrusions are arranged at intervals along the circumferential direction of the third annular damping member 8 to increase the friction between the user's palm and the third annular damping member 8.

[0101] Optionally, the third annular damping member 8 is any one of a soft rubber damping member, a rubber damping member, and a sponge damping member. Those skilled in the art can select and adjust the type of the third annular damping member 8 according to actual needs.

[0102] In some embodiments, the electric grinder may further include a key 9 and a switch board 10. The switch board 10 is located in the accommodation cavity 11 and is electrically connected to the drive motor 2. An installation hole 12 is formed through the housing 1, and at least a part of the key 9 is located in the installation hole 12 so as to be exposed from the housing 1 of the electric grinder. And the key 9 can reciprocate along the axial direction of the installation hole 12 to press the switch board 10 to control the drive motor 2 to turn on or off.

[0103] When the drive motor 2 is working, it will generate vibrations. When these vibrations are transmitted to the housing 1, it may cause the key 9 to be accidentally touched when vibrating, resulting in abnormal shutdown of the electric grinder and affecting the grinding efficiency and grinding accuracy.

[0104] Therefore, in one implementation manner of the embodiments of the present application, as Figure 1 and Figure 8 shown, the electric grinder may further include an elastic damping member 101. The elastic damping member 101 is located between the switch board 10 and the key 9 and is respectively connected to or abutted against the switch board 10 and the key 9.

[0105] By additionally providing an elastic damping member 101 between the button 9 and the switch board 10, when the button 9 moves axially along the mounting hole 12 under the action of vibration, the elastic damping member 101 will be squeezed. The elastic damping member 101 deforms to absorb a part of the squeezing force, so as to avoid accidental contact of the button 9 with the switch board 10 and accidentally shutting down the electric grinder.

[0106] Optionally, the elastic damping member 101 is any one of a soft rubber damping member, a rubber damping member, and a sponge damping member. Those skilled in the art can select and adjust the type of the elastic damping member 101 according to actual needs.

[0107] In one implementation manner of the embodiment of the present application, as Figure 5 shown, the electric grinder may further include a first bracket 102 and a second bracket 103; the cross-sectional shapes of the first bracket 102 and the second bracket 103 are both semi-circular. After the first bracket 102 and the second bracket 103 are buckled, a cavity is formed inside, and the cross-section is perpendicular to the axial direction of the drive motor 2; the drive motor 2 and the first annular damping member 5 are located in the cavity, and the first annular damping member 5 abuts against the inner wall of the cavity. The housing 1 is sleeved outside the first bracket 102 and the second bracket 103, and the inner wall of the accommodating cavity 11 is respectively connected to the outer walls of the first bracket 102 and the second bracket 103.

[0108] By additionally providing a first bracket 102 and a second bracket 103 outside the drive motor 2, the first annular damping member 5 abuts against the inner wall of the cavity. The vibration generated by the drive motor 2 during operation is first transmitted to the first annular damping member 5, weakened by the first annular damping member 5 and then transmitted to the first bracket 102 and the second bracket 103, and then transmitted to the housing 1. Compared with the solution that the drive motor 2 is directly installed inside the housing 1, resulting in the vibration generated by the drive motor 2 being directly transmitted to the housing 1, in the electric grinder provided by the embodiment of the present application, since the first bracket 102 and the second bracket 103 are provided inside the housing 1, and the drive motor 2 and the first annular damping member 5 are accommodated between the first bracket 102 and the second bracket 103, it is equivalent to increasing the wall thickness of the housing 1. The vibration weakened by the first annular damping member 5 will also be weakened to a certain extent when passing through the first bracket 102 and the second bracket 103, and less vibration will be transmitted to the housing 1, avoiding the user's palm from going numb due to vibration.

[0109] In one implementation manner of the embodiment of the present application, as Figure 5 and Figure 9As shown, the electric grinder may further include a first main board 104 and a second main board 105. The first main board 104 and the second main board 105 are stacked in a direction perpendicular to the axial direction of the drive motor 2, and the first main board 104 and the second main board 105 are spaced apart and electrically connected. In some embodiments, the first main board 104 and the second main board 105 may be electrically connected to the drive motor 2. Exemplarily, the first main board 104 and the second main board 105 may be electrically connected to the switch board 10, and the electrical connection with the drive motor 2 is achieved through the switch board 10.

[0110] In the electric grinder provided by the embodiment of the present application, the electric grinder is controlled by the stacked and electrically connected first main board 104 and second main board 105, which is equivalent to folding a main board. Thus, compared with the electric grinder in the related art, the length of the main board in the axial direction of the electric grinder can be shortened, and then the length of the electric grinder can be shortened. A shorter electric grinder is easier to operate in a narrow or restricted space, improving the operation flexibility and work efficiency, and can reduce the inconvenience caused by restricted operation; in addition, a shorter electric grinder is usually more stable during operation, with less vibration, which helps to reduce the fatigue of the user's palm and improve the comfort and accuracy of operation.

[0111] During the operation of the drive motor 2, part of the vibration generated will be transmitted to the main board. Under the influence of the vibration, problems such as component loosening, wire breakage, and short circuit may occur on the main board. Therefore, in one implementation manner of the embodiment of the present application, as Figure 9 、 Figure 10 and Figure 11 shown, the side of the first main board 104 facing away from the second main board 105 faces the first bracket 102; a first notch 1041 is formed on the edge of the first main board 104, and a first limiting member 1021 is provided on the first bracket 102. The first limiting member 1021 passes through the first notch 1041 and abuts against the second main board 105; a second notch 1051 is formed on the edge of the second main board 105, and the orthographic projection of the second notch 1051 on the projection plane is located inside the orthographic projection of the first notch 1041 on the projection plane. The projection plane is parallel to the surface of the first main board 104 facing the second main board 105; a second limiting member 1031 is provided on the second bracket 103, and at least part of the second limiting member 1031 extends into the second notch 1051.

[0112] When the first bracket 102 and the second bracket 103 are buckled, the first limiting member 1021 on the first bracket 102 passes through the first notch 1041 on the first main board 104 and abuts against the surface of the second main board 105 facing the first main board 104, forming a support between the first main board 104 and the second main board 105. And at least part of the second limiting member 1031 on the second bracket 103 extends into the second notch 1051 on the second main board 105. Since the first bracket 102 and the second bracket 103 are fixedly connected, the first limiting member 1021 and the second limiting member 1031 will not move relatively. Therefore, the first main board 104 and the second main board 105 can be limited in the axial direction of the drive motor 2, avoiding the shaking of the first main board 104 and the second main board 105 when being vibrated.

[0113] In some embodiments, the second limiting member 1031 passes through the second notch 1051 and abuts against the end face of the first limiting member 1021 facing the second main board 105. There is a frictional force between the first limiting member 1021 and the second limiting member 1031, and it is not easy for the first limiting member 1021 and the second limiting member 1031 to move relatively, which can play a better limiting role for the first main board 104 and the second main board 105.

[0114] In addition, in an implementation manner of the embodiment of the present application, as Figure 12 shown, a charging socket 1052 can be provided on the second main board 105, and the charging socket 1052 is vertically connected to the surface of the second main board 105 facing away from the first main board 104; a through hole 1032 is formed on the second bracket 103, and the charging socket 1052 passes through the through hole 1032 and is exposed outside the second bracket 103, wherein the shape of the through hole 1032 is adapted to the shape of the charging socket 1052.

[0115] In the electric grinder provided by the embodiment of the present application, a through hole 1032 can be formed on the second bracket 103, and the through hole 1032 is used for the charging socket 1052 on the second main board 105 to pass through, and the shape and size of the through hole 1032 match the shape and size of the charging socket 1052. When the first main board 104 and the second main board 105 tend to shake back and forth (shake along the axial direction of the drive motor 2) under the influence of vibration, the inner wall of the through hole 1032 abuts against the charging socket 1052, realizing the limitation of the charging socket 1052 in the axial direction of the drive motor 2, that is, limiting the first main board 104 and the second main board 105, and further avoiding the situation that the first main board 104 and the second main board 105 shake when being vibrated.

[0116] In some embodiments, as Figure 5As shown, the electric grinder may further include a self-locking nut 106 and an upper nut 107. The self-locking nut 106 is sleeved on the main shaft 3 and fixedly connected to the main shaft 3. The upper nut 107 is arranged on the side of the self-locking nut 106 away from the drive motor 2 and is threadedly connected to the main shaft 3. The self-locking nut 106 can achieve self-locking by friction and has the functions of preventing loosening and vibration resistance. When it is necessary to replace the tool chuck 4, the self-locking nut 106 can be fixed, and after the upper nut 107 is unscrewed, the tool chuck 4 can be replaced.

[0117] In some embodiments, at least two planes are formed on the outer wall of the main shaft 3 on the side away from the drive motor 2, and at least two corresponding planes are also provided on the inner wall of the self-locking nut 106. After the self-locking nut 106 is tightened, the planes on the main shaft 3 are in contact with the planes on the self-locking nut 106 to prevent the self-locking nut 106 from slipping and loosening under the action of vibration.

[0118] In some embodiments, as Figure 13 shown, three grooves 41 are formed on the side of the tool chuck 4 facing away from the drive motor 2. The three grooves 41 divide the tool chuck 4 into three arc-shaped segments 42, and the outer contours of the three arc-shaped segments 42 pass through the same circle. The diameter of this circle is larger than the diameter of the part of the tool chuck 4 where no groove 41 is formed. Therefore, during the tightening process of the upper nut 107, the three arc-shaped segments 42 will contract inward, and the three arc-shaped segments 42 are in close contact with the upper nut 107 to realize the clamping of the tool chuck 4.

[0119] In some embodiments, as Figure 1 and Figure 3 shown, the electric grinder may further include a stepless speed change knob 108. The stepless speed change knob 108 is arranged on the side of the housing 1 away from the tool chuck 4 and can rotate relative to the housing 1. By rotating the stepless speed change knob 108, the rotation speed of the tool chuck 4 can be adjusted.

[0120] In this application, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. The term "plurality" means two or more, unless otherwise clearly defined.

[0121] Those skilled in the art will readily think of other embodiments of this application after considering the specification and practicing the utility model disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application, which follow the general principles of this application and include the common general knowledge or conventional technical means in this technical field that are not disclosed in this application. The specification and embodiments are only regarded as exemplary.

[0122] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope.

Claims

1. An electric grinding machine, characterized in that, The electric grinder includes a housing (1), a drive motor (2), a main shaft (3), and a tool chuck (4); The interior of the housing (1) has a receiving cavity (11), and the drive motor (2) is located within the receiving cavity (11) and fixedly connected to the housing (1); The drive motor (2) includes a motor housing (21), a motor bearing (22), and a motor body (23). One side of the motor housing (21) has an opening (211), the motor bearing (22) is located within the opening (211), and the outer ring of the motor bearing (22) is connected to the inner wall of the motor housing (21); The first end of the main shaft (3) extends into the inner ring of the motor bearing (22) and is connected to the output shaft (231) in the motor body (23). The second end of the main shaft (3) is connected to the tool chuck (4), and the first end and the second end are opposite to each other.

2. The electric grinder according to claim 1, characterized in that, The drive motor (2) further includes a snap ring (24), the snap ring (24) is fixedly sleeved on the main shaft (3), the snap ring (24) is located on the side of the motor bearing (22) away from the tool chuck (4), and abuts against the motor bearing (22).

3. The electric grinding machine according to claim 1, wherein, The first end of the main shaft (3) is provided with a first connection hole (31), and one end of the output shaft (231) is fixed within the first connection hole (31); The second end of the main shaft (3) is provided with a second connection hole (32), one end of the tool chuck (4) is fixed within the second connection hole (32), and the second connection hole (32) communicates with the first connection hole (31).

4. The electric grinder according to claim 1, wherein The electric grinder further includes at least one first annular damping member (5), the at least one first annular damping member (5) is an elastic member, sleeved on the motor housing (21), and the at least one first annular damping member (5) is connected to or abuts against the inner wall of the receiving cavity (11).

5. The electric grinder according to claim 4, characterized in that, The number of the first annular damping members (5) is two, and the two first annular damping members (5) are respectively located on the opposite sides of the drive motor (2) along the axial direction.

6. The electric grinder according to claim 1, wherein The electric grinder further includes a bearing (6) and a second annular damping member (7); The bearing (6) is sleeved on the outer wall of the main shaft; The second annular damping member (7) is an elastic member, sleeved on the outer ring of the bearing (6), and connected to or abuts against the inner wall of the receiving cavity (11).

7. The electric grinder according to claim 6, characterized in that, The bearing (6) is slidably connected to the main shaft.

8. The electric grinder according to any one of claims 1 to 7, characterized in that, The electric grinder further includes a third annular damping member (8), the third annular damping member (8) is sleeved on the outer wall of the housing (1), and is located on the side of the housing (1) close to the tool chuck (4), wherein the third annular damping member (8) is an elastic member.

9. The electric grinding machine according to any one of claims 1 to 7, characterized in that, The electric grinder further includes a key (9), a switch board (10), and an elastic damping member (101); The switch board (10) is located within the receiving cavity (11) and is electrically connected to the drive motor (2); The housing (1) is provided with a through mounting hole (12), at least part of the button (9) is located in the mounting hole (12), and can reciprocate along the axial direction of the mounting hole (12). The button (9) is used to press the switch board (10) to control the opening or closing of the driving motor (2); The elastic shock absorber (101) is located between the switch board (10) and the button (9), and is respectively connected to or abutted against the switch board (10) and the button (9).

10. The electric grinding machine according to claim 4, characterized in that, The electric grinder further includes a first bracket (102) and a second bracket (103); The cross-sectional shapes of the first bracket (102) and the second bracket (103) are both semi-circular. After the first bracket (102) and the second bracket (103) are buckled, a cavity is formed inside, wherein the cross-section is perpendicular to the axial direction of the driving motor (2); The driving motor (2) and the first annular shock absorber (5) are located in the cavity, and the first annular shock absorber (5) abuts against the inner wall of the cavity. The housing (1) is sleeved outside the first bracket (102) and the second bracket (103), and the inner wall of the accommodating cavity (11) is respectively connected to the outer walls of the first bracket (102) and the second bracket (103).

11. The electric grinding machine according to claim 10, characterized in that, The electric grinder further includes a first main board (104) and a second main board (105). The first main board (104) and the second main board (105) are stacked in a direction perpendicular to the axial direction of the driving motor (2), and the first main board (104) and the second main board (105) are arranged at intervals, wherein the first main board (104) and the second main board (105) are electrically connected.

12. The electric grinder according to claim 11, characterized in that, The side of the first main board (104) facing away from the second main board (105) faces the first bracket (102); A first notch (1041) is formed on the edge of the first main board (104). A first limiting member (1021) is provided on the first bracket (102). The first limiting member (1021) passes through the first notch (1041) and abuts against the second main board (105); A second notch (1051) is formed on the edge of the second main board (105). The orthographic projection of the second notch (1051) on the projection plane is located inside the orthographic projection of the first notch (1041) on the projection plane. The projection plane is parallel to the surface of the first main board (104) facing the second main board (105); A second limiting member (1031) is provided on the second bracket (103), and at least part of the second limiting member (1031) extends into the second notch (1051).

13. The electric grinding machine according to claim 11, characterized in that, A charging socket (1052) is provided on the second main board (105), and the charging socket (1052) is vertically connected to the surface of the second main board (105) facing away from the first main board (104); The second bracket (103) is provided with a through opening (1032), and the charging socket (1052) passes through the through opening (1032) and is exposed outside the second bracket (103), wherein the shape of the through opening (1032) is adapted to the shape of the charging socket (1052).

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