Grinder

Abstract

The utility model provides a grinder which comprises an upper cover assembly, a sealing cover hinged to the upper cover assembly and an elastic piece located in the upper cover assembly, the top of one end of the sealing cover is connected with a first clamping portion, and a battery bin body and a second clamping portion are arranged in the upper cover assembly. A rechargeable battery is installed in the battery bin body, the second clamping part is movably matched with the first clamping part in a buckled mode in the telescopic direction of the elastic piece, and the elastic piece provides elastic force for the second clamping part to move towards the first clamping part to be matched in a buckled mode. The upper cover assembly is provided with a dismounting jack opposite to the second clamping part, the dismounting jack is located on the side, away from the elastic piece, of the second clamping part, the battery bin body is shielded through the sealing cover, and the situation that the rechargeable battery is exposed outside and lost is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of grinders, in particular to a grinder. Background Art

[0002] As people's needs increase, household handheld grinders are increasingly used. The battery pack is sealed with a cardboard, which can easily become dislodged due to contact during use and vibration during storage, exposing the battery and even causing it to fall and be lost. Therefore, to address this issue, we developed a grinder. Utility Model Content

[0003] The purpose of the utility model is to solve the shortcomings of the prior art and to provide a grinder.

[0004] In order to achieve the above-mentioned purpose, the present utility model adopts the following technical solutions.

[0005] An embodiment of the present utility model provides a grinder, which includes an upper cover assembly, a sealing cover hinged to the upper cover assembly, and an elastic member located inside the upper cover assembly, wherein a first clamping portion is connected to the top of one end of the sealing cover, a battery compartment body and a second clamping portion are provided inside the upper cover assembly, a rechargeable battery is installed inside the battery compartment body, the second clamping portion is movably engaged with the first clamping portion along the extension and contraction direction of the elastic member, and the elastic member provides the second clamping portion with an elastic force to move toward the first clamping portion for the purpose of clamping engagement, and the upper cover assembly is provided with a disassembly socket opposite to the second clamping portion, and the disassembly socket is located on the side of the second clamping portion facing away from the elastic member.

[0006] In some embodiments, the upper cover assembly includes a lower cover body, the top of the lower cover body is clamped with the upper cover body, and a sealing cover is provided at one end of the upper cover body and the lower cover body. A circuit board is installed on the inner wall of the lower cover body, the top of the circuit board is connected to the battery compartment body, the top of the battery compartment body is connected to the positioning storage compartment, the bottom of the inner wall of the positioning storage compartment is connected to an elastic member, a disassembly jack is opened through one end of the top of the upper cover body, the interior of the lower cover body is connected to a driving motor, the output end of the driving motor is connected to a driver, the output end of the driver is connected to a driving rod, the output end of the driving rod is connected to a grinding head, and both sides of the other end of the lower cover body are connected to a connecting frame, and the outside of the connecting frame is provided with a protective sleeve.

[0007] In some embodiments, a heat sink is connected to the bottom of the circuit board, and a heat dissipation window for use with the heat sink is formed through the bottom of the lower cover.

[0008] In some embodiments, several internal threaded columns are connected to both sides of the inner wall of the lower cover, and several positioning bolts are set on the top of the circuit board. The bottom of the positioning bolt passes through the circuit board and extends to the inside of the internal threaded column.

[0009] In some embodiments, a charging head for use with a rechargeable battery is installed at one end of the top of the circuit board, and a charging slot for use with the charging head is opened through the lower cover.

[0010] In some embodiments, several card frames are connected to both sides of the inner wall of the lower cover body, several card blocks used in conjunction with the card frames are connected to both sides of the bottom of the upper cover body, slots are provided on both sides of the top of the lower cover body, and inserts used in conjunction with the slots are connected to both sides of the bottom of the upper cover body.

[0011] In some embodiments, an installation window is provided on the top of the protective sleeve, and a sealing sliding cover is clamped inside the installation window.

[0012] In some embodiments, the inner wall of the protective sleeve is connected to a support sleeve, and the top and bottom of the connecting frame away from the lower cover body are connected to two internal threaded columns. One end of the inner wall of the protective sleeve is clamped with a cover plate, and the other end of the cover plate is connected to a protective cover used in conjunction with the grinding head. The protective cover is sleeved on the outside of the support sleeve, and the side of the grinding head away from the driving rod passes through the support sleeve and the protective cover respectively.

[0013] In some embodiments, a plurality of positioning bolts 2 are provided at the other end of the cover plate, one end of the positioning bolts 2 passes through the cover plate and extends to the interior of the internal threaded column 2, and sensor 1 and sensor 2 are respectively installed on both sides of the cover plate.

[0014] In some embodiments, the bottom of the other end of the lower cover is connected to a plug plate, and a through groove is provided on the plug plate and the protective sleeve for use with the plug plate. The lower cover and the upper cover are sleeved on the outside of the drive motor and the driver, and the protective sleeve is sleeved on the outside of the drive rod and the grinding head.

[0015] In any of the above embodiments of the present application, by cooperating with the sealing cover, the disassembly socket, the first engaging portion, the second engaging portion, and the elastic member, a pin is inserted through the disassembly socket to make it contact with the second engaging portion, and the pin is pressed hard to cause the second engaging portion to move downward under the action of the force. At this time, the elastic member is compressed, causing the second engaging portion to disengage from the first engaging portion, and the sealing cover can be pulled to remove it; the sealing cover is used to shield the battery compartment body to prevent the rechargeable battery from being exposed and lost, and also helps to reduce the probability of damage to the rechargeable battery due to external impact or misoperation, helps to maintain a tight connection between the sealing cover and the upper cover assembly, helps to reduce the loosening of the sealing cover due to vibration or collision during use, and also improves the aesthetics of the grinder. The design of the disassembly socket allows the user to easily open the sealing cover with a special tool, which helps to improve the convenience of replacing the battery and helps to reduce the trouble caused by the difficulty of removing the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 This is a schematic diagram of the structure of the utility model;

[0018] Figure 2 For this utility model Figure 1 Bottom view of

[0019] Figure 3 This is an exploded view of the structure of the utility model;

[0020] Figure 4 For this utility model Figure 3 Bottom view of

[0021] Figure 5 It is a schematic diagram of the local structure of the utility model;

[0022] Figure 6 This is a front bottom view of the protective sleeve of the utility model.

[0023] In the figure: 1. Sealing cover; 2. Disassembly jack; 3. Upper cover; 4. Lower cover; 5. Protective sleeve; 6. Sealing slide; 7. Radiator; 8. First engaging part; 9. Battery compartment; 10. Positioning storage compartment; 11. Second engaging part; 12. Elastic member; 13. Rechargeable battery; 14. Charging head; 15. Circuit board; 16. Driving motor; 17. Driver; 18. Driving rod; 19. Protective cover; 20. Sensor 1; 21. Cover; 22. Sensor 2; 23. Card block; 24. Card frame; 25. Heat dissipation window; 26. Connecting frame; 27. Installation window; 28. Insert board; 29. ​​Grinding head; 30. Support sleeve. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of the present invention.

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0026] See also Figures 1-6 , an embodiment of the present invention provides a grinder, which includes an upper cover assembly 100, a sealing cover 1 hinged to the upper cover assembly 100, and an elastic member 12 located in the upper cover assembly 100, the top of one end of the sealing cover 1 is connected to a first clamping portion 8, a battery compartment body 9 and a second clamping portion 11 are provided in the upper cover assembly 100, a rechargeable battery 13 is installed inside the battery compartment body 9, the second clamping portion 11 is movably engaged with the first clamping portion 8 along the extension and contraction direction of the elastic member 12, and the elastic member 12 provides the second clamping portion 11 with an elastic force to move toward the first clamping portion 8 for clamping engagement, the upper cover assembly 100 is provided with a disassembly socket 2 opposite to the second clamping portion 11, and the disassembly socket 2 is located on the side of the second clamping portion 11 away from the elastic member 12.

[0027] In this way, the card pin is used to penetrate the disassembly socket 2 so that it contacts the second engaging portion 11. The card pin is pressed hard so that the second engaging portion 11 moves downward under the action of the force. At this time, the elastic member 12 is compressed, so that the second engaging portion 12 is separated from the first engaging portion 8. The sealing cover 1 can be pulled to remove it. The sealing cover 1 is used to shield the battery compartment 9 to prevent the rechargeable battery 13 from being exposed and lost. It also helps to reduce the probability of the rechargeable battery 13 being damaged by external impact or misoperation, helps to maintain a close connection between the sealing cover 1 and the upper cover assembly 100, helps to reduce the loosening of the sealing cover 1 due to vibration or collision during use, and also improves the aesthetics of the grinder. The design of the disassembly socket 2 allows the user to easily open the sealing cover with a special tool, which helps to improve the convenience of replacing the battery and helps to reduce the trouble caused by the difficulty of removing the battery.

[0028] As a technical optimization solution of the present invention, the first engaging portion 8 and the second engaging portion 11 can be engaged with each other in a block-to-block manner.

[0029] For example, the first engaging portion 8 may include a rib, which may be protruding from the sealing cover 1, for example, the rib may be protruding from the inner surface of the sealing cover 1. The second engaging portion 11 may include a hook, which may be engaged in the upper cover assembly 100. The hook is opposite to the rib and can hook onto the rib, so that the sealing cover 1 and the upper cover assembly 100 can be engaged with each other.

[0030] For another example, the first engaging portion 8 may include a hook, which may be protruding from the sealing cover 1, for example, the hook may be protruding from the inner surface of the sealing cover 1. The second engaging portion 11 may include a rib, which may be engaged with the upper cover assembly 100. The hook is opposite to the rib and can hook onto the rib, thereby similarly enabling the sealing cover 1 and the upper cover assembly 100 to engage with each other.

[0031] For another example, the first engaging portion 8 and the second engaging portion 11 may both include hooks, and the hooks of the two can hook onto each other to achieve mutual engagement between the sealing cover 1 and the upper cover assembly 100 .

[0032] In some embodiments, the rechargeable battery 13 refers to a rechargeable battery with a limited number of charging times. When used with a charger, the advantages of the rechargeable battery 13 are that it is economical, environmentally friendly, has sufficient power, and is suitable for high-power and long-term use electrical appliances. The voltage of the rechargeable battery 13 is lower than that of a disposable battery of the same model.

[0033] As a technical optimization solution of the present invention, the grinder includes a lower cover body 4, the top of the lower cover body 4 is clamped with the upper cover body 3, and one end of the upper cover body 3 and the lower cover body 4 are jointly provided with a sealing cover 1, the top of one end of the sealing cover 1 is connected with a first clamping portion 8, the inner wall of the lower cover body 4 is installed with a circuit board 15, the top of the circuit board 15 is connected to a battery compartment body 9, the top of the battery compartment body 9 is connected to a positioning storage compartment 10, the bottom of the inner wall of the positioning storage compartment 10 is connected with an elastic member 12, the top of the elastic member 12 is connected with a second clamping portion 11, one end of the top of the upper cover body 3 is penetrated by the above-mentioned disassembly socket 2, the interior of the lower cover body 4 is connected to a driving motor 16, the output end of the driving motor 16 is connected to a driver 17, the output end of the driver 17 is connected to a driving rod 18, the output end of the driving rod 18 is connected to a grinding head 29, and both sides of the other end of the lower cover body 4 are connected to a connecting frame 26, and the outer side of the connecting frame 26 is provided with a protective sleeve 5. Thus, the design of the positioning storage compartment 10 helps maintain the stable position of the rechargeable battery, helping to reduce the possibility of the battery becoming loose or shifting due to device vibration or collision. The design of the protective sleeve 5 also helps to improve the safety and durability of the grinder, because the protective sleeve provides additional protection for the drive rod 18 and grinding head 29, helping to reduce direct impact of external objects on these components, and thus helping to extend the service life of the grinder.

[0034] As a technical optimization solution of the present invention, the elastic member 12 can be a spring. A spring is a mechanical part that uses elasticity to work. A part made of elastic material deforms under the action of an external force and returns to its original shape after the external force is removed.

[0035] As a technical optimization solution of the present invention, the bottom of the circuit board 15 is connected to a heat sink 7, and a heat dissipation window 25 is provided through the bottom of the lower cover 4 for use with the heat sink 7. The connection between the heat sink 7 and the bottom of the circuit board 15 helps to quickly conduct heat generated by the circuit board 15 during operation, facilitating heat dissipation from the circuit board 15 and improving the service life of the circuit board 15. The circuit board 15 provides a stable support platform for circuit components and prevents short circuits between different conductive parts in the circuit. The heat dissipation window 25 at the bottom of the lower cover 4 helps dissipate heat to the external environment, helping to reduce the risk of performance degradation or damage to the circuit board 15 due to excessive temperature, thereby improving the service life of the circuit board 15 and the stability of the system.

[0036] As a technical optimization solution of the present invention, several internally threaded posts (I) are connected to both sides of the inner wall of the lower cover body 4. Several positioning bolts (I) are provided on the top of the circuit board 15. The bottoms of the positioning bolts (I) penetrate the circuit board 15 and extend into the interior of the internally threaded posts (I). The cooperation between the internally threaded posts (I) and the positioning bolts (I) facilitates the positioning and installation of the circuit board 15. The internally threaded posts (I) mainly refer to components with threads machined on the inner surface of cylindrical parts. Their outer surface is usually a smooth cylindrical shape, which is convenient for installation and positioning, while the internal threads are used to cooperate with parts with external threads, such as bolts and screws, to achieve functions such as connection, fastening, or transmission.

[0037] As a technical optimization solution of the present invention, a charging head 14 for use with the rechargeable battery 13 is installed at one end of the top of the circuit board 15, and a charging slot for use with the charging head 14 is opened through the lower cover 4; through the charging slot, the charging head 14 is conveniently exposed to the outside, and the installation position design of the charging head 14 helps to facilitate the user to dock the charger. The design of the charging slot helps to ensure that the charging head can be smoothly connected to the power supply, helps to reduce the inconvenience caused by improper position of the charging port, is beneficial to subsequent charging, and helps to improve the user's charging experience.

[0038] In addition, such a design also helps to improve the overall aesthetics of the equipment, because a reasonable layout can make the appearance of the grinder more simple and elegant.

[0039] As a technical optimization solution of the present invention, the charging head 14 is a Type-C interface, USB Type-C, etc.

[0040] As a technical optimization solution of the present invention, several card frames 24 are connected to both sides of the inner wall of the lower cover body 4, and several card blocks 23 are connected to both sides of the bottom of the upper cover body 3 for use with the card frames 24. Slots are opened on both sides of the top of the lower cover body 4, and inserts are connected to both sides of the bottom of the upper cover body 3 for use with the slots. The cooperation between the card frames 24 and the card blocks 23 facilitates the positioning connection between the lower cover body 4 and the upper cover body 3, improves the stability of the connection between the two, helps to ensure a close fit between the two, and helps to reduce loosening caused by vibration or collision. In addition, the design of the slots and inserts facilitates the rapid alignment and installation of the upper cover body 3 and the lower cover body 4, helps to reduce the time required for assembly, and helps to improve assembly efficiency.

[0041] As a technical optimization solution of the present invention, the top of the protective sleeve 5 is provided with an installation window 27, into which a sealing slide 6 is snapped. The sealing slide 6 shields the installation window 27, simplifying the opening and closing process of the installation window 27. The design of the sealing slide 6 provides a convenient way to shield the installation window 27, helping to reduce the possibility of external dust or foreign matter entering the installation window, thereby helping to keep the internal components clean. Furthermore, the slide 6 enhances the aesthetics of the device, as it blends seamlessly into the overall design of the device, improving the product's appearance.

[0042] As a technical optimization solution of the present invention, the inner wall of the protective sleeve 5 is connected to a support sleeve 30, and the top and bottom of the connecting frame 26 away from one end of the lower cover body 4 are connected to the internal threaded column 2, one end of the inner wall of the protective sleeve 5 is clamped with a cover plate 21, and the other end of the cover plate 21 is connected to a protective cover 19 used in conjunction with the grinding head 29. The protective cover 19 is sleeved on the outside of the support sleeve 30, and the side of the grinding head 29 away from the driving rod 18 passes through the support sleeve 30 and the protective cover 19 respectively. Such a design helps to improve the stability of the grinding head 29. The combined use of the support sleeve 30 and the protective cover 19 helps to reduce the swing of the grinding head 29 during operation and helps to ensure the stability of the grinding process. At the same time, the design of the protective cover 19 helps to reduce the possibility of material splashing and helps to improve the cleanliness of the working environment.

[0043] In addition, the provision of the cover plate 21 helps to protect internal components, helps to reduce the chance of external impurities entering the interior of the protective sleeve 5, and helps to extend the service life of the equipment.

[0044] As a technical optimization solution of the present invention, a plurality of positioning bolts 2 are provided at the other end of the cover plate 21, one end of the positioning bolts 2 passes through the cover plate 21 and extends to the interior of the internal threaded column 2, and sensor 1 20 and sensor 2 22 are respectively installed on both sides of the cover plate 21; through the cooperation of the internal threaded column 2 and the positioning bolts 2, the cover plate 21 is conveniently positioned and installed.

[0045] As a technical optimization solution of the present invention, a plug plate 28 is connected to the bottom of the other end of the lower cover 4. Both the plug plate 28 and the protective sleeve 5 are provided with through slots for use with the plug plate 28. This design helps simplify the installation process of the device. By providing through slots in the plug plate 28 and the protective sleeve 5, it facilitates the insertion and securing of the plug plate 28, helps reduce positional deviation during installation, and helps improve the accuracy and convenience of installation. In addition, this design helps ensure a stable connection between the plug plate 28 and the protective sleeve 5, helping to reduce the possibility of loosening or falling off due to vibration during device operation.

[0046] As a technical optimization solution of the present invention, the lower cover 4 and the upper cover 3 are sleeved on the outside of the drive motor 16 and the driver 17, and the protective sleeve 5 is sleeved on the outside of the drive rod 18 and the grinding head 29. In this way, the wrapping of the lower cover 4 and the upper cover 3 helps to reduce the impact of the external environment on the drive motor 16 and the driver 17, helps to reduce the possibility of dust, moisture or other contaminants entering the motor and the driver, and helps to increase the service life of these key components. At the same time, such a design also helps to protect the motor and the driver from external physical damage, helping to reduce damage caused by collisions or falls.

[0047] The design of the protective sleeve 5 helps to provide additional protection for the driving rod 18 and the grinding head 29, helps to reduce damage to the grinding head due to improper operation during use, and helps to maintain the sharpness and working efficiency of the grinding head.

[0048] When the present invention is in use, when the sealing cover 1 needs to be disassembled, a card pin is used to penetrate the disassembly socket 2 so that it contacts the second engaging portion 11. The card pin is pressed so that the second engaging portion 11 moves downward under the action of force. At this time, the elastic member 12 is compressed, so that the second engaging portion 11 is disengaged from the first engaging portion 8. The sealing cover 1 can be pulled to remove it; the sealing cover 1 is used to shield the battery compartment body 9 to prevent the rechargeable battery 13 from being exposed and lost, and also improves the aesthetics of the grinder.

[0049] In this utility model, unless otherwise expressly specified or limited, terms such as "mounted," "connected," and "fixed" should be interpreted broadly. For example, these terms may refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; internal communication between two components; surface contact only; or surface contact through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0050] In addition, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as specific or special structures. The descriptions of the terms "some embodiments", "other embodiments", etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In the present invention, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present invention and the features of the different embodiments or examples, unless they are contradictory.

[0051] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. A grinder, characterized in that include: Upper cover assembly (100); A sealing cover (1) hinged to the upper cover assembly (100); as well as an elastic member (12) located in the upper cover assembly (100); The top of one end of the sealing cover (1) is connected to a first locking portion (8), a battery compartment body (9) and a second locking portion (11) are provided in the upper cover assembly (100), a rechargeable battery (13) is installed inside the battery compartment body (9), the second locking portion (11) is movably snap-fitted with the first locking portion (8) along the extension and contraction direction of the elastic member (12), the elastic member (12) provides an elastic force for the second locking portion (11) to move toward the first locking portion (8) for snap-fitting, and the upper cover assembly (100) is provided with a disassembly socket (2) opposite to the second locking portion (11), and the disassembly socket (2) is located on a side of the second locking portion (11) away from the elastic member (12).

2. The grinder according to claim 1, wherein The upper cover assembly (100) includes a lower cover body (4), the top of the lower cover body (4) is clamped with the upper cover body (3), one end of the upper cover body (3) and the lower cover body (4) are jointly provided with a sealing cover (1), the inner wall of the lower cover body (4) is installed with a circuit board (15), the top of the circuit board (15) is connected to the battery compartment body (9), the top of the battery compartment body (9) is connected to the positioning storage compartment (10), the bottom of the inner wall of the positioning storage compartment (10) is connected to the elastic member (12), one end of the top of the upper cover body (3) is penetrated by the disassembly jack (2), the interior of the lower cover body (4) is connected to a driving motor (16), the output end of the driving motor (16) is connected to a driver (17), the output end of the driver (17) is connected to a driving rod (18), the output end of the driving rod (18) is connected to a grinding head (29), and both sides of the other end of the lower cover body (4) are connected to a connecting frame (26), and the outer surface of the connecting frame (26) is provided with a protective sleeve (5).

3. The grinder according to claim 2, characterized in that The bottom of the circuit board (15) is connected to a radiator (7), and a heat dissipation window (25) for use with the radiator (7) is provided through the bottom of the lower cover (4).

4. The grinder according to claim 2, characterized in that A plurality of internal threaded columns are connected to both sides of the inner wall of the lower cover (4), and a plurality of positioning bolts are provided on the top of the circuit board (15). The bottom of the positioning bolts passes through the circuit board (15) and extends to the inside of the internal threaded column.

5. The grinder according to claim 2, wherein: A charging head (14) for use with the rechargeable battery (13) is installed at one end of the top of the circuit board (15), and a charging notch for use with the charging head (14) is provided through the lower cover (4).

6. The grinder according to claim 2, characterized in that Both sides of the inner wall of the lower cover body (4) are connected to a plurality of card frames (24), both sides of the bottom of the upper cover body (3) are connected to a plurality of card blocks (23) used in conjunction with the card frames (24), both sides of the top of the lower cover body (4) are provided with slots, and both sides of the bottom of the upper cover body (3) are connected to insert strips used in conjunction with the slots.

7. The grinder according to claim 2, characterized in that A mounting window (27) is provided on the top of the protective sleeve (5), and a sealing sliding cover (6) is clamped inside the mounting window (27).

8. The grinder according to claim 2, wherein: The inner wall of the protective sleeve (5) is connected to a support sleeve (30), and the top and bottom of the connecting frame (26) away from the lower cover body (4) are both connected to the internal threaded column 2, and one end of the inner wall of the protective sleeve (5) is clamped with a cover plate (21), and the other end of the cover plate (21) is connected to a protective cover (19) used in conjunction with the grinding head (29), and the protective cover (19) is sleeved on the outside of the support sleeve (30), and the side of the grinding head (29) away from the driving rod (18) passes through the support sleeve (30) and the protective cover (19) respectively.

9. The grinder according to claim 8, characterized in that The other end of the cover plate (21) is provided with a plurality of positioning bolts 2, one end of which passes through the cover plate (21) and extends to the interior of the internal threaded column 2. Sensor 1 (20) and sensor 2 (22) are respectively installed on both sides of the cover plate (21).

10. The grinder according to claim 2, wherein The bottom of the other end of the lower cover (4) is connected to an insert plate (28), and a through slot for use with the insert plate (28) is provided on both the insert plate (28) and the protective sleeve (5); the lower cover (4) and the upper cover (3) are sleeved on the outside of the drive motor (16) and the driver (17), and the protective sleeve (5) is sleeved on the outside of the drive rod (18) and the grinding head (29).

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