Handheld grinder

Abstract

The utility model relates to a handheld grinder which comprises a charging barrel with an inner cavity, an adjusting ring is arranged on the charging barrel, the adjusting ring is sleeved on the charging barrel, the adjusting ring is in threaded connection with the charging barrel, a mounting sleeve and a grinding assembly are arranged in the charging barrel, the grinding assembly comprises an outer grinding head and an inner grinding head, the outer grinding head is fixedly connected with the charging barrel, and the inner grinding head is fixedly connected with the charging barrel. The inner grinding head is connected with the top cover through a connecting rod, the connecting rod penetrates through the mounting sleeve, at least one first connecting plate is arranged between the mounting sleeve and the charging barrel, the two ends of the first connecting plate are connected with the outer wall face of the mounting sleeve and the inner wall face of the charging barrel respectively, and the connecting rod is connected with the inner grinding head. The adjusting ring is used for driving the connecting rod to ascend so as to adjust the height difference between the outer grinding head and the inner grinding head. The handheld grinder has the advantages that due to the design of the adjusting ring, the height difference between the outer grinding head and the inner grinding head can be adjusted by rotating the adjusting ring, then the grinding thickness is adjusted, and operation is convenient and comfortable.

Description

Technical Field

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

[0002] With the advancement and development of society, more and more families are adding grinders to their kitchenware to grind seasonings such as Sichuan peppercorns, peppercorns, and salt to enrich the taste of food. In the existing art, most grinders have the gear adjustment located at the bottom. However, this requires turning the grinder upside down to adjust the position, which is inconvenient to operate. Furthermore, the limited space at the bottom makes adjustment uncomfortable. Utility Model Content

[0003] An object of the present application is to provide a handheld grinder that can easily adjust the grinding coarseness.

[0004] The technical solution adopted in this application is: a hand-held grinder, comprising a barrel with an inner cavity, an adjusting ring provided on the barrel, the adjusting ring sleeve mounted on the barrel, the adjusting ring and the barrel being connected by threads, a mounting sleeve and a grinding assembly being provided in the barrel, the grinding assembly comprising an outer grinding head and an inner grinding head, the outer grinding head being connected and fixed to the barrel, the inner grinding head being connected to the top cover through a connecting rod, the connecting rod being passed through the mounting sleeve, at least one first connecting plate being provided between the mounting sleeve and the barrel, the two ends of the first connecting plate being respectively connected to the outer wall surface of the mounting sleeve and the inner wall surface of the barrel, the connecting rod being connected to the inner grinding head, and the adjusting ring being used to drive the connecting rod to rise and thereby adjust the height difference between the outer grinding head and the inner grinding head.

[0005] Compared with the prior art, the advantage of the present application lies in the design of the adjustment ring, which allows the height difference between the outer grinding head and the inner grinding head to be adjusted by rotating the adjustment ring, thereby adjusting the grinding coarseness, and the operation is convenient and comfortable.

[0006] In some embodiments of the present application, a top cover is provided on the top of the barrel, the top cover can rotate relative to the barrel, an adjustment ring is located between the barrel and the top cover, and the inner grinding head is connected to the top cover through a connecting rod.

[0007] In some embodiments of the present application, a retaining groove is provided on the inner wall surface of the adjustment ring, and the retaining groove is arranged in an array around the center of the adjustment ring, and a retaining block that cooperates with the retaining groove is provided on the outer wall surface of the barrel.

[0008] In some embodiments of the present application, a positioning ring is provided in the center of the adjustment ring, and at least one second connecting plate is provided between the positioning ring and the barrel. The two ends of the second connecting plate are respectively connected to the outer wall surface of the positioning ring and the inner wall surface of the adjustment ring, and the connecting rod is passed through the positioning ring.

[0009] Furthermore, a first mounting groove is provided on the positioning ring, a first bearing is provided on the first mounting groove, and the inner and outer ends of the first bearing are respectively connected to the connecting rod and the positioning ring; a convex ring is provided on the connecting rod, and the convex ring is used to block the first bearing.

[0010] Furthermore, the upper and lower ends of the mounting sleeve are provided with second mounting grooves, the second mounting grooves are provided with second bearings, the inner and outer ends of the second bearings are respectively connected to the connecting rod and the mounting sleeve; an elastic member is provided between the second bearing and the inner grinding head.

[0011] In some embodiments of the present application, a polygonal hole is provided on the top cover, and the top end of the connecting rod cooperates with the polygonal hole and passes through the polygonal hole.

[0012] Furthermore, a positioning hole is provided below the polygonal hole, and part of the connecting rod cooperates with the positioning hole and passes through the positioning hole; a positioning column is provided on the top cover, and the polygonal hole is provided on the positioning column and passes through the positioning column up and down.

[0013] Furthermore, the top cover includes a bottom plug and a grip tube with an inner cavity, the bottom plug is arranged at the bottom of the grip tube, and the bottom plug is connected to the grip tube by a thread; the positioning column is arranged on the bottom plug; the bottom plug is provided with an outwardly protruding arc surface or hemispherical surface, and the adjusting ring is provided with a blocking surface that cooperates with the arc surface or hemispherical surface.

[0014] In some embodiments of the present application, a positioning seat and a fixing seat are provided at the bottom of the barrel, the positioning seat is fixedly connected to the barrel, the fixing seat is connected to the barrel by threads, the top surface of the external grinding head is in contact with the positioning seat, and the bottom surface of the external grinding head is in contact with the fixing seat.

[0015] A handheld grinder comprises a barrel with an inner cavity, a mounting sleeve and a grinding assembly are provided in the barrel, the grinding assembly comprises an outer grinding head and an inner grinding head, the outer grinding head is connected and fixed to the barrel, a connecting rod is passed through the mounting sleeve, at least one first connecting plate is provided between the mounting sleeve and the barrel, the two ends of the first connecting plate are respectively connected to the outer wall surface of the mounting sleeve and the inner wall surface of the barrel, and the connecting rod is connected to the inner grinding head; a positioning seat and a fixing seat are provided at the bottom of the barrel, the positioning seat is fixedly connected to the barrel, the fixing seat is connected to the barrel by threads, the top surface of the outer grinding head is in contact with the positioning seat, and the bottom surface of the outer grinding head is in contact with the fixing seat.

[0016] In some embodiments of the present application, an adjustment ring is provided on the barrel, which is sleeved on the barrel. The adjustment ring is connected to the barrel through a threaded connection, and the adjustment ring is used to drive the connecting rod to rise and thereby adjust the height difference between the outer grinding head and the inner grinding head.

[0017] In some embodiments of the present application, a top cover is provided on the top of the barrel, the top cover can rotate relative to the barrel, an adjustment ring is located between the barrel and the top cover, and the inner grinding head is connected to the top cover through a connecting rod.

[0018] Furthermore, a retaining groove is provided on the inner wall surface of the adjusting ring, and the retaining groove is arranged in an array around the center of the adjusting ring, and a retaining block is provided on the outer wall surface of the barrel to cooperate with the retaining groove.

[0019] Furthermore, a positioning ring is provided in the center of the adjustment ring, and at least one second connecting plate is provided between the positioning ring and the barrel. The two ends of the second connecting plate are respectively connected to the outer wall surface of the positioning ring and the inner wall surface of the adjustment ring, and the connecting rod is passed through the positioning ring.

[0020] Furthermore, a first mounting groove is provided on the positioning ring, a first bearing is provided on the first mounting groove, and the inner and outer ends of the first bearing are respectively connected to the connecting rod and the positioning ring; a convex ring is provided on the connecting rod, and the convex ring is used to block the first bearing.

[0021] Furthermore, the upper and lower ends of the mounting sleeve are provided with second mounting grooves, the second mounting grooves are provided with second bearings, the inner and outer ends of the second bearings are respectively connected to the connecting rod and the mounting sleeve; an elastic member is provided between the second bearing and the inner grinding head.

[0022] In some embodiments of the present application, a polygonal hole is provided on the top cover, and the top end of the connecting rod cooperates with the polygonal hole and passes through the polygonal hole.

[0023] Furthermore, a positioning hole is provided below the polygonal hole, and part of the connecting rod cooperates with the positioning hole and passes through the positioning hole; a positioning column is provided on the top cover, and the polygonal hole is provided on the positioning column and passes through the positioning column up and down.

[0024] Furthermore, the top cover includes a bottom plug and a grip tube with an inner cavity, the bottom plug is arranged at the bottom of the grip tube, and the bottom plug is connected to the grip tube by a thread; the positioning column is arranged on the bottom plug; the bottom plug is provided with an outwardly protruding arc surface or hemispherical surface, and the adjusting ring is provided with a blocking surface that cooperates with the arc surface or hemispherical surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of Example 1 of the present utility model;

[0026] Figure 2 It is a cross-sectional view of Example 1 of the present utility model;

[0027] Figure 3 This is a schematic structural diagram of the barrel of Example 1 of the present utility model;

[0028] Figure 4 It is a structural schematic diagram of the positioning ring of Example 1 of the present utility model.

[0029] In the figure: 1. Barrel; 2. Top cover; 3. Mounting sleeve; 4. Grinding assembly; 5. Outer grinding head; 6. Inner grinding head; 7. Connecting rod; 8. First connecting plate; 9. Adjusting ring; 10. Positioning groove; 11. Block; 12. Positioning ring; 13. Second connecting plate; 14. First mounting groove; 15. First bearing; 16. Convex ring; 17. Second mounting groove; 18. Second bearing; 19. Elastic member; 20. Polygonal hole; 21. Positioning hole; 22. Positioning column; 23. Bottom plug; 24. Grip; 25. Positioning seat; 26. Fixed seat; 27. Hemispherical surface; 28. Blocking surface. DETAILED DESCRIPTION

[0030] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the following is a detailed description of the specific implementation method, structure, characteristics and effects of the present invention in combination with the accompanying drawings and preferred embodiments.

[0031] Example 1:

[0032] This embodiment provides a handheld grinder, such as Figure 1 、 Figure 2 As shown, the barrel 1 includes an inner cavity. A top cover 2 is provided on the top of the barrel 1, which is rotatable relative to the barrel 1. A mounting sleeve 3 and a grinding assembly 4 are provided within the barrel 1. The grinding assembly 4 includes an outer grinding head 5 and an inner grinding head 6. The outer grinding head 5 is fixedly connected to the barrel 1, and the inner grinding head 6 is connected to the top cover 2 via a connecting rod 7. The connecting rod 7 is provided on the mounting sleeve 3. At least one first connecting plate 8 is provided between the mounting sleeve 3 and the barrel 1. The ends of the first connecting plate 8 are respectively connected to the outer wall of the mounting sleeve 3 and the inner wall of the barrel 1. In this embodiment, three first connecting plates 8 are provided. The top cover 2 is removable, which facilitates the placement of the material to be ground into the inner cavity of the barrel 1. The inner cavity of the barrel 1 is used to hold the material to be ground. The outer grinding head 5 is fixedly connected to the barrel 1, and the inner grinding head 6 is connected to the top cover 2 via a connecting rod 7. The top cover 2 can rotate relative to the barrel 1. Therefore, when the top cover 2 is rotated, the top cover 2 drives the connecting rod 7, which in turn rotates the inner grinding head 6. The outer grinding head 5 and the inner grinding head 6 rotate relative to each other to grind the material. Compared with traditional grinders with a rotating bottom, this grinder uses a rotating top cover 2, which is more suitable for gripping and more comfortable to rotate. The bottom of the grinder can be appropriately enlarged to expand the grinding area.

[0033] To facilitate adjustment of the grinding coarseness, an adjustment ring 9 is provided between the barrel 1 and the top cover 2. The adjustment ring 9 is sleeved on the barrel 1 and is connected to the barrel 1 via a threaded connection. The adjustment ring 9 is used to drive the connecting rod 7 upward. The design of the adjustment ring 9 allows the height difference between the outer grinding head 5 and the inner grinding head 6 to be adjusted by rotating the adjustment ring 9, thereby adjusting the grinding coarseness.

[0034] In order to ensure the reliable adjustment of grinding coarseness and fineness, Figure 3、 Figure 4 As shown, the inner wall of the adjustment ring 9 is provided with retaining grooves 10, arranged in an array around the center of the adjustment ring 9. The outer wall of the barrel 1 is provided with retaining blocks 11 that engage with the retaining grooves 10. In this embodiment, there are 24 retaining grooves 10 and three retaining blocks 11; these retaining blocks 11 utilize snap-action positioning latches. The coordinated design of the retaining grooves 10 and retaining blocks 11 provides a sense of shifting when adjusting the grinding coarseness of the adjustment ring 9 while preventing the adjustment ring 9 from rotating freely.

[0035] In order to ensure the stable installation of the connecting rod 7, a positioning ring 12 is provided in the center of the adjusting ring 9. At least one second connecting plate 13 is provided between the positioning ring 12 and the barrel 1. The two ends of the second connecting plate 13 are respectively connected to the outer wall surface of the positioning ring 12 and the inner wall surface of the adjusting ring 9. The connecting rod 7 is passed through the positioning ring 12. The positioning ring 12 can guide and fix the connecting rod 7, making the rotation of the connecting rod 7 more stable.

[0036] In order to ensure smooth rotation of the connecting rod 7, the positioning ring 12 is provided with a first mounting groove 14, and a first bearing 15 is provided on the first mounting groove 14. The inner and outer ends of the first bearing 15 are respectively connected to the connecting rod 7 and the positioning ring 12. The design of the first bearing 15 can make the rotation between the connecting rod 7 and the positioning ring 12 smoother.

[0037] In order to ensure reliable installation of the connecting rod 7, a convex ring 16 is provided on the connecting rod 7, which fits against the side of the first bearing 15 away from the positioning ring 12 and blocks the first bearing 15. The design of the convex ring 16 can limit the movement of the connecting rod 7 and prevent the connecting rod 7 from sliding downward.

[0038] To ensure smooth rotation of the connecting rod 7, the mounting sleeve 3 is provided with second mounting slots 17 at both the upper and lower ends. A second bearing 18 is mounted on the second mounting slot 17. The inner and outer ends of the second bearing 18 are connected to the connecting rod 7 and the mounting sleeve 3, respectively. An elastic member 19 is provided between the second bearing 18 and the inner grinding head 6. In this embodiment, the elastic member 19 is a spring. The design of the second bearing 18 ensures smooth rotation between the connecting rod 7 and the mounting sleeve 3. The design of the elastic member 19 also applies downward pressure to the inner grinding head 6, ensuring secure installation of the inner grinding head 6.

[0039] In order to ensure that the top cover 2 drives the connecting rod 7 to rotate reliably, a polygonal hole 20 is provided on the top cover 2, and the top end of the connecting rod 7 cooperates with the polygonal hole 20 and is penetrated by the polygonal hole 20. The polygonal hole 20 cooperates with the top end of the connecting rod 7 to prevent the top end of the connecting rod 7 from slipping, thereby ensuring that the top cover 2 drives the connecting rod 7 to rotate reliably.

[0040] To facilitate the installation of the connecting rod 7, a positioning hole 21 is provided below the polygonal hole 20. A portion of the connecting rod 7 cooperates with and passes through the positioning hole 21. A positioning post 22 is provided on the top cover 2. The polygonal hole 20 is set on the positioning post 22 and passes through the positioning post 22 from top to bottom. The design of the positioning hole 21 ensures that the front end of the connecting rod 7 enters the positioning hole 21 before entering the polygonal hole 20, reducing the range of movement of the front end of the connecting rod 7 and facilitating the front end of the connecting rod 7 to enter the polygonal hole 20. The polygonal hole 20 passes through the positioning post 22, making it easy to push the connecting rod 7 downward from the polygonal hole 20 to remove the top cover 2.

[0041] To improve the practicality of the top cover 2, the top cover 2 includes a bottom plug 23 and a grip tube 24 with an inner cavity. The bottom plug 23 is located at the bottom of the grip tube 24 and is connected to the grip tube 24 via a threaded connection. A positioning post 22 is provided on the bottom plug 23. The inner cavity of the grip tube 24 can be used to accommodate spare abrasives. The bottom plug 23 and the grip tube 24 are connected via a threaded connection, allowing for easy removal of the grip tube 24.

[0042] To strengthen the connection, the bottom plug 23 is provided with an outwardly convex curved or hemispherical surface 27, and the adjustment ring 9 is provided with a blocking surface 28 that cooperates with the curved or hemispherical surface 27. In this embodiment, the hemispherical surface 27 is provided on the bottom plug 23 by a retractable marble provided on the bottom plug 23, with the retracting force provided by a spring. After the bottom plug 23 is installed, the hemispherical surface 27 mates with the blocking surface 28, which prevents the hemispherical surface 27 from being dislodged. Without force, the bottom plug 23 cannot be dislodged. To remove the bottom plug 23, simply pull it out with force. The hemispherical surface 27 and the adjustment ring 9 deform, or the hemispherical surface 27 contracts inward under force, allowing the bottom plug 23 to be smoothly dislodged.

[0043] To ensure reliable grinding, a positioning seat 25 and a fixing seat 26 are provided at the bottom of the barrel 1. The positioning seat 25 is fixedly connected to the barrel 1, and the fixing seat 26 is threadedly connected to the barrel 1. The top surface of the outer grinding head 5 is in contact with the positioning seat 25, and the bottom surface of the outer grinding head 5 is in contact with the fixing seat 26. In this embodiment, the barrel 1 is sleeved on the positioning seat 25 and the fixing seat 26, and the positioning seat 25 is sleeved on the outer grinding head 5; the positioning seat 25 is threadedly connected to the inner wall of the barrel 1 and fixed with glue to prevent the positioning seat 25 from moving. Of course, the positioning seat 25 and the barrel 1 can also be an integral structure. After the traditional grinder disassembles the grinding assembly 4 for cleaning, the relative positions of the outer grinding head 5 and the inner grinding head 6 will change, and the grinding gear needs to be readjusted, which is inconvenient to use. The design of the positioning seat 25 makes the installation position of the outer grinding head 5 fixed, and the fixing seat 26 is used to press the outer grinding head 5, and the height of the inner grinding head 6 is controlled by the connecting rod 7. Disassembling the inner grinding head 6 will not change the position of the connecting rod 7, and the position of the inner grinding head 6 will not change after reinstallation, which ensures that the grinding gear will not change and does not need to be readjusted.

[0044] Example 2:

[0045] This embodiment provides a handheld grinder, such as Figure 1 、 Figure 2 As shown, it includes a barrel 1 with an inner cavity, a mounting sleeve 3 and a grinding assembly 4 are provided in the barrel 1, the grinding assembly 4 includes an outer grinding head 5 and an inner grinding head 6, the outer grinding head 5 is fixedly connected to the barrel 1, and a connecting rod 7 is passed through the mounting sleeve 3, and at least one first connecting plate 8 is provided between the mounting sleeve 3 and the barrel 1, and the two ends of the first connecting plate 8 are respectively connected to the outer wall surface of the mounting sleeve 3 and the inner wall surface of the barrel 1, and the connecting rod 7 is connected to the inner grinding head 6; a positioning seat 25 and a fixing seat 26 are provided at the bottom of the barrel 1, the positioning seat 25 is fixedly connected to the barrel 1, and the fixing seat 26 is connected to the barrel 1 by threads, the top surface of the outer grinding head 5 is in contact with the positioning seat 25, and the bottom surface of the outer grinding head 5 is in contact with the fixing seat 26. In this embodiment, the barrel 1 is mounted on a positioning seat 25 and a fixing seat 26, and the positioning seat 25 is mounted on the outer grinding head 5. The positioning seat 25 is threadedly connected to the inner wall of the barrel 1 and fixed with glue to prevent the positioning seat 25 from moving. Of course, the positioning seat 25 and the barrel 1 can also be an integral structure. In a traditional grinder, after the grinding assembly 4 is disassembled for cleaning, the relative positions of the outer grinding head 5 and the inner grinding head 6 will change, which requires re-adjusting the grinding position, which is inconvenient to use. The design of the positioning seat 25 ensures that the installation position of the outer grinding head 5 is fixed, and the fixing seat 26 is used to press the outer grinding head 5. The height of the inner grinding head 6 is controlled by the connecting rod 7. Removing the inner grinding head 6 does not change the position of the connecting rod 7, and thus the position of the inner grinding head 6 does not change after reinstallation, which ensures that the grinding position does not change and does not require readjustment.

[0046] The remaining technical features are the same as those described in Example 1.

[0047] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A handheld grinder, characterized in that: The invention comprises a barrel (1) with an inner cavity, wherein an adjusting ring (9) is provided on the barrel (1), the adjusting ring (9) is sleeved on the barrel (1), the adjusting ring (9) and the barrel (1) are connected by threads, a mounting sleeve (3) and a grinding assembly (4) are provided in the barrel (1), the grinding assembly (4) comprises an outer grinding head (5) and an inner grinding head (6), the outer grinding head (5) is connected and fixed to the barrel (1), a connecting rod (7) is passed through the mounting sleeve (3), at least one first connecting plate (8) is provided between the mounting sleeve (3) and the barrel (1), the two ends of the first connecting plate (8) are respectively connected to the outer wall surface of the mounting sleeve (3) and the inner wall surface of the barrel (1), the connecting rod (7) is connected to the inner grinding head (6), and the adjusting ring (9) is used to drive the connecting rod (7) to rise and thereby adjust the height difference between the outer grinding head (5) and the inner grinding head (6).

2. A handheld grinder according to claim 1, characterized in that: The top of the barrel (1) is provided with a top cover (2), which can rotate relative to the barrel (1), and the adjusting ring (9) is located between the barrel (1) and the top cover (2). The inner grinding head (6) is connected to the top cover (2) via a connecting rod (7); the bottom of the barrel (1) is provided with a positioning seat (25) and a fixing seat (26), the positioning seat (25) is fixedly connected to the barrel (1), and the fixing seat (26) is connected to the barrel (1) via a threaded connection, the top surface of the outer grinding head (5) is in contact with the positioning seat (25), and the bottom surface of the outer grinding head (5) is in contact with the fixing seat (26).

3. The handheld grinder according to claim 1, wherein: The inner wall surface of the adjusting ring (9) is provided with a locking groove (10), and the locking groove (10) is arranged in an array around the center of the adjusting ring (9). The outer wall surface of the barrel (1) is provided with a locking block (11) that cooperates with the locking groove (10).

4. The handheld grinder according to claim 1, wherein: A positioning ring (12) is provided at the center of the adjusting ring (9), and at least one second connecting plate (13) is provided between the positioning ring (12) and the barrel (1). The two ends of the second connecting plate (13) are respectively connected to the outer wall surface of the positioning ring (12) and the inner wall surface of the adjusting ring (9), and the connecting rod (7) is passed through the positioning ring (12).

5. A handheld grinder according to claim 4, characterized in that: The positioning ring (12) is provided with a first mounting groove (14), the first mounting groove (14) is provided with a first bearing (15), the inner and outer ends of the first bearing (15) are respectively connected to the connecting rod (7) and the positioning ring (12); the connecting rod (7) is provided with a convex ring (16), and the convex ring (16) is used to block the first bearing (15).

6. A handheld grinder according to claim 5, characterized in that: The upper and lower ends of the mounting sleeve (3) are both provided with second mounting grooves (17), a second bearing (18) is provided on the second mounting groove (17), and the inner and outer ends of the second bearing (18) are respectively connected to the connecting rod (7) and the mounting sleeve (3); an elastic member (19) is provided between the second bearing (18) and the inner grinding head (6).

7. The handheld grinder according to claim 2, wherein: The top cover (2) is provided with a polygonal hole (20), and the top end of the connecting rod (7) cooperates with the polygonal hole (20) and is passed through the polygonal hole (20).

8. A handheld grinder according to claim 7, characterized in that: A positioning hole (21) is provided below the polygonal hole (20), and a portion of the connecting rod (7) cooperates with the positioning hole (21) and is passed through the positioning hole (21); a positioning column (22) is provided on the top cover (2), and the polygonal hole (20) is provided on the positioning column (22) and passes through the positioning column (22) from top to bottom.

9. A handheld grinder according to claim 8, characterized in that: The top cover (2) comprises a bottom plug (23) and a grip tube (24) with an inner cavity, wherein the bottom plug (23) is arranged at the bottom of the grip tube (24), and the bottom plug (23) and the grip tube (24) are connected by threads; the positioning column (22) is arranged on the bottom plug (23); the bottom plug (23) is provided with an outwardly protruding arc surface or hemispherical surface (27), and the adjusting ring (9) is provided with a blocking surface (28) that cooperates with the arc surface or hemispherical surface (27).

10. A handheld grinder, characterized in that: The invention comprises a barrel (1) with an inner cavity, wherein a mounting sleeve (3) and a grinding assembly (4) are provided in the barrel (1), wherein the grinding assembly (4) comprises an outer grinding head (5) and an inner grinding head (6), wherein the outer grinding head (5) is connected and fixed to the barrel (1), a connecting rod (7) is passed through the mounting sleeve (3), and at least one first connecting plate (8) is provided between the mounting sleeve (3) and the barrel (1), wherein the two ends of the first connecting plate (8) are respectively connected to the outer wall surface of the mounting sleeve (3) and the inner wall surface of the barrel (1), and the connecting rod (7) is connected to the inner grinding head (6); a positioning seat (25) and a fixing seat (26) are provided at the bottom of the barrel (1), wherein the positioning seat (25) is fixedly connected to the barrel (1), and the fixing seat (26) is connected to the barrel (1) by a thread, wherein the top surface of the outer grinding head (5) is in contact with the positioning seat (25), and the bottom surface of the outer grinding head (5) is in contact with the fixing seat (26).

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