Handheld mixer with dynamic balance adjustment system

Abstract

The utility model discloses a handheld mixer with dynamic balance adjusting system, including host shell cover, stirring work head and built -in electric drive unit of host shell cover, still include: the pipe cover link head, and the lower end part of host shell cover is fixedly connected through locking mechanism, the pipe cover bushing, movably with the outside of pipe cover link head of axial sliding limit component, support cover, fixed in the outside of pipe cover bushing, first balance adjusting structure, act between pipe cover link head and pipe cover bushing, in the utility model, first balance adjusting structure will vibration kinetic energy be converted into elastic potential energy in the axial movement pair of pipe cover link head and pipe cover bushing constitution, and the vibration is blocked to the handle transmission, second balance adjusting structure further absorbs vibration through the axial floating of sliding bearing sleeve, can absorb the vibration that the motor high -speed operation produced when mixer starts, reduce the tremor of hand, thereby promote the operation stability, alleviate hand fatigue.

Description

Technical Field

[0001] This utility model relates to the field of handheld mixer technology, and in particular to a handheld mixer with a dynamic balance adjustment system. Background Technology

[0002] A handheld mixer is a portable power tool that uses a built-in motor to drive the working head to rotate at high speed for crushing, mixing, emulsifying, and other processing of materials. It features flexible operation, high efficiency, convenience, and easy cleaning.

[0003] In the field of handheld blender technology, traditional products often employ rigidly connected tube-and-shell assemblies. The high-frequency vibrations generated when the motor drives the blending head to rotate at high speed are transmitted along the metal rod to the handle, causing noticeable hand tremors. This is especially problematic when handling hard ingredients or during prolonged continuous operation, reducing operator comfort. While existing technologies attempt to mitigate vibration by optimizing motor dynamic balancing, these passive vibration reduction solutions cannot dynamically compensate for the instantaneous impacts caused by changes in food resistance. Therefore, they struggle to achieve dynamic response and effective buffering. Vibrations are still transmitted to the handle through the rigid connector, resulting in hand tremors and reduced grip stability, ultimately compromising operational stability and user comfort.

[0004] Therefore, an innovative structure with active balance adjustment capability is needed, which can set up an elastic buffer in the vibration transmission path to solve the technical bottlenecks of large vibration, tiring operation, and poor stability of handheld mixers. Utility Model Content

[0005] The purpose of this invention is to provide a handheld mixer with a dynamic balance adjustment system to solve the above-mentioned problems.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a handheld mixer with a dynamic balance adjustment system, comprising a main unit housing, a mixing head, and an electric drive unit built into the main unit housing, and further comprising: The tube cover connector is fixed to the lower end of the main unit housing via a locking mechanism; The tube cover bushing is movably fitted onto the outside of the tube cover connector by means of an axial sliding limiting component, wherein the axial sliding limiting component restricts the axial displacement stroke of the tube cover bushing relative to the tube cover connector. The support cover is fixed to the outside of the tube cover bushing, and its bottom end face contacts the inner bottom surface of the mixing container, providing support and positioning during operation. The first balance adjustment structure acts between the tube cover connector and the tube cover bushing, and dynamically compensates for the vibration load generated when the stirring head rotates at high speed.

[0007] Preferably, the locking structure includes: The locking ring is fixed to the bottom mounting surface of the main unit housing by bolts; The annular cover and the positioning bushing are provided. The annular cover is fixed to the outside of the locking ring by a snap-fit ​​structure. The positioning bushing is embedded in the inside of the annular cover by a snap-fit ​​structure. A guide sleeve is coaxially extended from the inner wall of the positioning bushing. A limiting component is disposed between the mating surfaces of the annular cover and the positioning bushing. When the positioning bushing is axially pushed into the inner cavity of the annular cover, the annular cover and the locking ring cooperate to clamp and lock the limiting component axially.

[0008] Preferably, the limiting component includes a locking sleeve, the bottom of which is provided with two elastic locking plates, and the side wall of the tube cover connector is provided with a corresponding locking interface. When the tube cover connector is inserted into the guide sleeve to the working position, the elastic locking plates are elastically engaged in the locking interface to restrict the axial disengagement of the tube cover connector.

[0009] Preferably, the snap-fit ​​structure includes: Multiple latches are provided on the outer circumferential surface of the locking ring; Multiple snap fasteners are provided on the outer circumferential surface of the positioning bushing; The buckle groove is provided on the side wall of the annular cover, and the buckle groove is engaged with buckle one and buckle two respectively.

[0010] Preferably, the top of the guide sleeve has an clearance opening adapted to the elastic clamping plate, and the locking ring, locking sleeve, tube cover connector and tube cover bushing are all provided with a constraint structure to restrict circumferential rotation. The constraint structure is a spline and a spline groove that cooperate with each other. The inlet end of the spline groove is a flared guide portion, which provides assembly tolerance margin.

[0011] Preferably, the first balance adjustment structure is a spring, the two ends of which elastically abut against the lower end face of the tube cover connector and the inner cavity end face of the tube cover bushing, respectively.

[0012] Preferably, the inner wall of the tube cover bushing is coaxially provided with an inner lining ring, and the axial sliding limiting assembly includes a limiting hook disposed on the outer wall of the tube cover connector and an axial limiting groove opened on the side wall of the inner lining ring. The limiting hook and the axial limiting groove slide together to constrain the axial movement range of the inner lining ring.

[0013] Preferably, a conical sleeve is embedded inside the support cover, and the inner cavity of the conical sleeve is provided with a sealing lip ring and an optional second balance adjustment structure.

[0014] Preferably, the interior of the conical sleeve is divided into an upper cavity and a lower cavity by an annular partition, the sealing lip ring is embedded in the lower cavity and elastically covers the outer circumferential surface of the stirring head, and the second balance adjustment structure includes: A sliding bearing sleeve is axially slidably disposed in the upper cavity, and the sliding bearing sleeve and the tapered sleeve are connected by a spline pair; Spring 2 elastically abuts against the sliding bearing sleeve and the annular partition; An axial limiting retaining ring is provided on the shaft section of the stirring head; Preferably, the axial limiting retaining ring is a C-shaped retaining ring, and a retaining ring groove is provided on the shaft of the stirring working head, and the C-shaped retaining ring is engaged in the retaining ring groove; The stirring head is fitted with a shock-absorbing pad, which is axially limited between the sliding bearing sleeve and the C-shaped retaining ring, and the inner wall of the sliding bearing sleeve is embedded with a damping rubber sleeve.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: 1. In this application, the first balance adjustment structure converts the vibration kinetic energy into elastic potential energy in the axial moving pair formed by the pipe cover connector and the pipe cover bushing, blocking the transmission of vibration to the handle; the second balance adjustment structure further absorbs vibration through the axial floating of the sliding bearing sleeve. When the mixer is started, it can absorb the vibration generated by the high-speed operation of the motor, reduce hand tremors, thereby improving operational stability and reducing hand fatigue.

[0016] 2. In this application, the bottom end of the support cover contacts the bottom of the container, providing stable support and positioning for the whole machine during the operation of the mixer. This can not only counteract the radial offset force generated when the mixing head rotates at high speed, preventing the mixer from shifting position due to vibration, but also distribute the weight load of the machine body by contact support, reducing the difficulty of stability control when holding the machine, and ensuring the uniformity of the mixing operation and the safety of operation.

[0017] 3. In this application, the three-layer nested buckle design of locking ring, annular cover and positioning bushing enables quick assembly and disassembly of tube cover assembly. Combined with the spline groove inlet flared guide part to compensate for assembly errors, reduce the difficulty of spline insertion, and provide a certain assembly tolerance margin for the component, thereby ensuring assembly convenience and circumferential constraint reliability. Attached Figure Description

[0018] Figure 1 A front view of a mixer provided according to an embodiment of the present invention is shown; Figure 2 A cross-sectional view of a mixer provided according to an embodiment of the present invention is shown; Figure 3A cross-sectional schematic diagram of the inner structure of the annular cover provided according to an embodiment of the present invention is shown; Figure 4 An exploded view of the inner structure of the annular cover provided according to an embodiment of the present invention is shown; Figure 5 A three-dimensional structural schematic diagram of the tube cover connector provided according to an embodiment of the present utility model is shown; Figure 6 A cross-sectional view of the tube cover connector provided according to an embodiment of the present invention is shown. Figure 7 A cross-sectional structural schematic diagram of the tube cover bushing provided according to an embodiment of the present utility model is shown; Figure 8 A cross-sectional view of the conical sleeve provided according to an embodiment of the present invention is shown.

[0019] Legend: 1. Main unit housing; 2. Pipe cover connector; 201. Limiting hook; 202. Snap-fit ​​interface; 3. Pipe cover bushing; 301. Inner liner ring; 302. Axial limiting groove; 4. Support cover; 5. Mixing head; 6. Spring 1; 7. Locking ring; 8. Snap-fit ​​1; 9. Locking sleeve; 901. Elastic retaining plate; 10. Positioning bushing; 1001. Guide sleeve; 1002. Snap-fit ​​2; 11. Conical sleeve; 12. Sliding bearing sleeve; 13. Shock-absorbing pad; 14. C-type retaining ring; 15. Annular cover; 1501. Snap groove; 16. Spring 2; 17. Sealing lip ring. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figures 1-8 This utility model provides a technical solution: a handheld mixer with a dynamic balance adjustment system, including a main housing 1, a mixing head 5, and an electric drive unit built into the main housing 1. The electric drive unit typically includes a high-speed motor, a planetary gear reducer, and an electronic control module. Its output shaft is connected to the drive shaft of the mixing head 5 via a coupling, providing an adjustable speed rotational power source for the mixing head 5.

[0022] Also includes: The tube cover connector 2 is fixed to the lower end of the main unit housing 1 by a locking mechanism; The pipe cover bushing 3 is movably fitted onto the outside of the pipe cover connector 2 via an axial sliding limiting component, which restricts the axial displacement stroke of the pipe cover bushing 3 relative to the pipe cover connector 2.

[0023] The tube cover bushing 3 and the tube cover connector 2 form an axial moving pair. In this part, the first balance adjustment structure converts the vibration kinetic energy into elastic potential energy instead of directly transmitting it to the handle, thus achieving vibration isolation.

[0024] The support cover 4 is fixed to the outside of the tube cover bushing 3, and its bottom end face is in contact with the inner bottom surface of the mixing container, providing support and positioning during operation.

[0025] The support cover 4 has its bottom end in contact with the bottom of the container, providing stable support and positioning for the whole machine during the operation of the mixer. It can not only counteract the radial offset force generated when the mixing head 5 rotates at high speed, preventing the mixer from shifting due to vibration, but also distribute the weight load of the machine body by contact support, reducing the difficulty of stability control when holding the machine, and ensuring the uniformity of mixing operation and operational safety.

[0026] The first balance adjustment structure acts between the pipe cover connector 2 and the pipe cover bushing 3, and dynamically compensates for the vibration load generated when the stirring head 5 rotates at high speed.

[0027] When the mixing head 5 vibrates due to the resistance of the ingredients and its own high-speed rotational inertia, the first balance adjustment structure can directly absorb and buffer the vibration energy, preventing the vibration from being transmitted upward along the tube cover connector 2 to the grip part of the machine body, reducing hand fatigue and grip instability.

[0028] Specifically, such as Figures 2-7 As shown, the locking structure includes: The locking ring 7 is fixed to the bottom mounting surface of the main unit housing 1 by bolts.

[0029] The locking ring 7 serves as a basic connecting component, and is fixed to the bottom mounting surface of the main unit housing 1 by bolts. This not only ensures the connection strength with the main unit housing 1, but also provides a reference carrier for the subsequent assembly of the annular cover 15 and the positioning bushing 10.

[0030] The annular cover 15 and the positioning bushing 10 are fixed to the outside of the locking ring 7 by a snap-fit ​​structure. The positioning bushing 10 is embedded in the inside of the annular cover 15 by a snap-fit ​​structure, and a guide sleeve 1001 is coaxially extended from the inner wall of the positioning bushing 10. The positioning bushing 10 and the guide sleeve 1001 are integrally injection molded.

[0031] The annular cover 15 is fixed to the outside of the locking ring 7 via a snap-fit ​​structure, enabling quick assembly and circumferential positioning with the locking ring 7. Its inner space provides an installation cavity for the positioning bushing 10. The positioning bushing 10 is then embedded into the inner side of the annular cover 15 via a snap-fit ​​structure. A guide sleeve 1001 extending coaxially from its inner wall provides guidance for the insertion and assembly of the tube cover connector 2, ensuring coaxial docking between the tube cover connector 2 and the internal electric drive mechanism of the main housing cover 1.

[0032] The snap-fit ​​structure includes: Multiple buckles 8 are provided on the outer periphery of the locking ring 7; the buckles 8 are integrally injection molded with the locking ring 7.

[0033] Multiple snap fasteners 1002 are provided on the outer peripheral surface of the positioning bushing 10; the snap fasteners 1002 and the positioning bushing 10 are integrally injection molded.

[0034] The buckle groove 1501 is provided on the side wall of the annular cover 15, and the buckle groove 1501 is engaged with buckle 8 and buckle 1002 respectively.

[0035] During assembly, the annular cover 15 is fitted onto the outside of the locking ring 7, so that the first buckle 8 is engaged in the buckle groove 1501 on the side wall of the annular cover 15. Through the elastic deformation engagement of the first buckle 8, the radial displacement and circumferential rotation of the annular cover 15 relative to the locking ring 7 are restricted. Next, the positioning bushing 10 is embedded into the inside of the annular cover 15, and the second buckle 1002 is simultaneously engaged in the buckle groove 1501. On the one hand, the engagement of the second buckle 1002 restricts the radial movement and circumferential rotation of the positioning bushing 10 relative to the annular cover 15. On the other hand, with the constraint of the cavity of the annular cover 15, the positioning bushing 10 and the locking ring 7 are coaxially aligned, providing a stable reference for the subsequent insertion of the tube cover connector 2 into the guide sleeve 1001.

[0036] The limiting component is disposed between the mating surfaces of the annular cover 15 and the positioning bushing 10. When the positioning bushing 10 is axially pushed into the inner cavity of the annular cover 15, the annular cover 15 and the locking ring 7 work together to clamp and axially lock the limiting component.

[0037] When the positioning bushing 10 is axially pushed into the preset assembly position along the inner cavity of the annular cover 15, the limiting component is in the clamping space formed by the lower end of the annular cover 15 and the upper end of the locking ring 7. At this time, the annular cover 15, which is radially fixed to the locking ring 7 by the buckle 8, works with the positioning bushing 10 to apply axial pressure, tightly clamping the limiting component, thereby axially locking the limiting component, ensuring that locking is triggered only after the component is assembled in place, and avoiding functional failure caused by assembly deviation.

[0038] The limiting component includes a locking sleeve 9, with two elastic locking plates 901 at the bottom. The side wall of the tube cover connector 2 is provided with a corresponding locking interface 202. When the tube cover connector 2 is inserted into the guide sleeve 1001 to the working position, the elastic locking plates 901 are elastically engaged in the locking interface 202 to restrict the axial disengagement of the tube cover connector 2.

[0039] The locking sleeve 9 has two elastic retaining plates 901 at its bottom, which have deformation properties. When the pipe cover connector 2 is inserted axially into the working position along the guide sleeve 1001, the side wall of the pipe cover connector 2 will first squeeze the elastic retaining plates 901 to cause elastic deformation until the pipe cover connector 2 reaches the preset position. Under its own elastic restoring action, the elastic retaining plates 901 will engage with the retaining interface 202 on the side wall of the pipe cover connector 2, forming a mechanical interlocking structure. This limits the risk of the pipe cover connector 2 coming off axially along the guide sleeve 1001.

[0040] The top of the guide sleeve 1001 has a clearance opening that is adapted to the elastic clamping plate 901. The locking ring 7, the locking sleeve 9, the pipe cover connector 2 and the pipe cover bushing 3 are all provided with a constraint structure to restrict circumferential rotation. The constraint structure is a spline and a spline groove that cooperate with each other. The inlet end of the spline groove is a flared guide part, which provides assembly tolerance margin.

[0041] The clearance opening eliminates assembly interference and ensures precise locking of the limiting components. The rigid fit between the spline and the spline groove directly restricts the relative circumferential rotation between components, preventing wear and abnormal noise caused by friction from relative rotation. The flared guide at the spline groove inlet, by widening the inlet area during assembly, compensates for minor coaxiality deviations during component assembly, reducing the difficulty of spline insertion. It also provides a certain assembly tolerance margin, ensuring that even with slight machining or assembly errors, the spline can still smoothly slide into the groove, thus guaranteeing ease of assembly and reliability of circumferential constraints.

[0042] Specifically, such as Figures 2-7 As shown, the first balance adjustment structure is a spring 6, whose two ends are elastically abutting between the lower end face of the tube cover connector 2 and the inner cavity end face of the tube cover bushing 3.

[0043] Spring 6 serves as the first balance adjustment structure. Through elastic contact between its two ends and the lower end face of the tube cover connector 2 and the inner end face of the tube cover bushing 3 respectively, when the stirring head 5 rotates at high speed and generates axial vibration, it absorbs vibration energy and buffers axial load by its own elastic deformation, thereby dynamically offsetting the impact of vibration on the whole machine and achieving balance adjustment.

[0044] The inner wall of the tube cover bushing 3 is coaxially provided with an inner lining ring 301, which is integrally injection molded with the tube cover bushing 3. The axial sliding limiting assembly includes a limiting hook 201 disposed on the outer wall of the tube cover connector 2 and an axial limiting groove 302 opened on the side wall of the inner lining ring 301. The limiting hook 201 and the axial limiting groove 302 slide in cooperation to constrain the axial movement range of the inner lining ring 301.

[0045] The inner wall of the pipe cover bushing 3 is coaxially provided with an inner lining ring 301. The axial sliding limit assembly is connected to the axial limit groove 302 through the sliding engagement of the limit hook 201. The sliding stroke of the limit hook 201 in the axial limit groove 302 is used as a constraint to limit the axial movement range of the inner lining ring 301 and the pipe cover bushing 3 relative to the pipe cover connector 2, thereby avoiding the two from affecting the operation of the first balance adjustment structure or causing the component to fail due to excessive axial displacement.

[0046] Specifically, such as Figure 8 As shown, a conical sleeve 11 is embedded inside the support cover 4, and the inner cavity of the conical sleeve 11 is provided with a sealing lip ring 17 and an optional second balance adjustment structure.

[0047] The conical sleeve 11 embedded inside the support cover 4 achieves a sealing protection between the stirring head 5 and the outside by setting a sealing lip ring 17 in the inner cavity, preventing food debris and liquid from seeping in. The second balance adjustment structure further buffers the vibration generated by the high-speed rotation of the stirring head 5, achieving the dual effect of sealing protection and vibration compensation, ensuring the stability of equipment operation and service life.

[0048] The conical sleeve 11 is embedded and fixed inside the support cover 4, providing an installation carrier for the inner sealing lip ring 17 of the conical sleeve 11 and the second balance adjustment structure.

[0049] The interior of the conical sleeve 11 is divided into an upper chamber and a lower chamber by an annular partition. The sealing lip ring 17 is embedded in the lower chamber and elastically covers the outer circumferential surface of the stirring head 5. The second balance adjustment structure includes: The sliding bearing sleeve 12 is axially slidably disposed in the upper cavity, and the sliding bearing sleeve 12 is connected to the tapered sleeve 11 through a spline pair. Spring 16 elastically abuts against the sliding bearing sleeve 12 and the annular partition plate; An axial limiting retaining ring is installed on the shaft section of the mixing head 5.

[0050] The conical sleeve 11 is divided into upper and lower cavities by an annular partition. In the lower cavity, the sealing lip ring 17 elastically covers the outer circumference of the stirring head 5 to achieve a seal. In the upper cavity, the sliding bearing sleeve 12 is circumferentially positioned with the conical sleeve 11 through a spline pair and can slide axially. The second spring 16 elastically abuts against the sliding bearing sleeve 12 and the annular partition. The axial limiting retaining ring of the shaft section of the stirring head 5 restricts the axial displacement of the sliding bearing sleeve 12. When the stirring head 5 rotates at high speed and generates axial vibration, the second spring 16 buffers the vibration load through elastic deformation to achieve dynamic balance adjustment.

[0051] The axial limiting retaining ring is a C-type retaining ring 14. A retaining ring groove is provided on the shaft of the stirring working head 5, and the C-type retaining ring 14 is engaged in the retaining ring groove.

[0052] The C-type retaining ring 14 serves as an axial limiting retaining ring. By being clamped in the retaining ring groove of the shaft of the stirring head 5, it forms an axial blocking structure, which can limit the displacement range of the sliding bearing sleeve 12 along the axial direction of the stirring head 5, and provide a stable force-bearing surface for the elastic buffer of the second spring 16 in the second balance adjustment structure.

[0053] A shock-absorbing pad 13 is fitted on the mixing head 5. The shock-absorbing pad 13 is axially limited between the sliding bearing sleeve 12 and the C-shaped retaining ring 14, and a damping rubber sleeve is embedded in the inner wall of the sliding bearing sleeve 12.

[0054] The damping pads 13 on the mixing head 5 are axially positioned between the sliding bearing sleeve 12 and the C-shaped retaining ring 14, buffering the axial impact and vibration transmission between them. The damping rubber sleeve on the inner wall of the sliding bearing sleeve 12, with its elastic material, can buffer the radial vibration impact when the mixing head 5 rotates at high speed through material deformation. The close contact between the damping rubber sleeve and the outer circumferential surface of the mixing head 5 can reduce the intermittent friction and collision caused by vibration between the two. This can reduce friction noise and weaken radial vibration through damping, further ensuring the dynamic balance of the mixer during operation and improving the stability of the mixing operation.

[0055] The above description of the embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A handheld mixer with a dynamic balance adjustment system, comprising a main housing (1), a mixing head (5), and an electric drive unit built into the main housing (1), characterized in that, Also includes: The tube cover connector (2) is fixed to the lower end of the main unit housing (1) by a locking mechanism; The tube cover bushing (3) is movably sleeved on the outside of the tube cover connector (2) by means of an axial sliding limiting component, which restricts the axial displacement stroke of the tube cover bushing (3) relative to the tube cover connector (2). The support cover (4) is fixed on the outside of the tube cover bushing (3), and its bottom end face is in contact with the inner bottom surface of the mixing container, providing support and positioning during operation. The first balance adjustment structure acts between the tube cover connector (2) and the tube cover bushing (3), and dynamically compensates for the vibration load generated when the stirring head (5) rotates at high speed through the first balance adjustment structure.

2. A handheld mixer with a dynamic balance adjustment system according to claim 1, characterized in that, The locking mechanism includes: The locking ring (7) is fixed to the bottom mounting surface of the main unit housing (1) by bolts; The annular cover (15) and the positioning bushing (10) are fixed to the outside of the locking ring (7) by a snap-fit ​​structure. The positioning bushing (10) is embedded in the inside of the annular cover (15) by a snap-fit ​​structure, and a guide sleeve (1001) is coaxially extended from the inner wall of the positioning bushing (10). The limiting component is disposed between the mating surfaces of the annular cover (15) and the positioning bushing (10). When the positioning bushing (10) is axially pushed into the inner cavity of the annular cover (15), the annular cover (15) and the locking ring (7) cooperate to clamp and axially lock the limiting component.

3. A handheld mixer with a dynamic balance adjustment system according to claim 2, characterized in that, The limiting component includes a locking sleeve (9), and the bottom of the locking sleeve (9) is provided with two elastic locking plates (901). The side wall of the tube cover connector (2) is provided with a corresponding locking interface (202). When the tube cover connector (2) is inserted into the guide sleeve (1001) to the working position, the elastic locking plate (901) is elastically engaged in the locking interface (202) to restrict the axial disengagement of the tube cover connector (2).

4. A handheld mixer with a dynamic balance adjustment system according to claim 2, characterized in that, The snap-fit ​​structure includes: Multiple latches (8) are provided on the outer periphery of the locking ring (7); Multiple snap fasteners (1002) are provided on the outer peripheral surface of the positioning bushing (10). The buckle groove (1501) is provided on the side wall of the annular cover (15), and the buckle groove (1501) is engaged with the buckle one (8) and the buckle two (1002) respectively.

5. A handheld mixer with a dynamic balance adjustment system according to claim 3, characterized in that, The top of the guide sleeve (1001) has a clearance opening adapted to the elastic clamp (901). The locking ring (7), locking sleeve (9), tube cover connector (2) and tube cover bushing (3) are all provided with a constraint structure to restrict circumferential rotation. The constraint structure is a spline and spline groove that cooperate with each other. The inlet end of the spline groove is a flared guide part, which provides assembly tolerance margin.

6. A handheld mixer with a dynamic balance adjustment system according to claim 1, characterized in that, The first balance adjustment structure is a spring (6), whose two ends are elastically abutted between the lower end face of the tube cover connector (2) and the inner cavity end face of the tube cover bushing (3).

7. A handheld mixer with a dynamic balance adjustment system according to claim 1, characterized in that, The inner wall of the tube cover bushing (3) is coaxially provided with an inner lining ring (301). The axial sliding limiting assembly includes a limiting hook (201) disposed on the outer wall of the tube cover connector (2) and an axial limiting groove (302) opened on the side wall of the inner lining ring (301). The limiting hook (201) and the axial limiting groove (302) slide to constrain the axial movement range of the inner lining ring (301).

8. A handheld mixer with a dynamic balance adjustment system according to claim 1, characterized in that, The support cover (4) is fitted with a conical sleeve (11), and the inner cavity of the conical sleeve (11) is provided with a sealing lip ring (17) and an optional second balance adjustment structure.

9. A handheld mixer with a dynamic balance adjustment system according to claim 8, characterized in that, The conical sleeve (11) is divided into an upper cavity and a lower cavity by an annular partition. The sealing lip ring (17) is embedded in the lower cavity and elastically covers the outer circumferential surface of the stirring head (5). The second balance adjustment structure includes: A sliding bearing sleeve (12) is axially slidably disposed in the upper cavity, and the sliding bearing sleeve (12) and the tapered sleeve (11) are connected by a spline pair; Spring 2 (16) elastically abuts against the sliding bearing sleeve (12) and the annular partition; An axial limiting retaining ring is provided on the shaft section of the stirring working head (5).

10. A handheld mixer with a dynamic balance adjustment system according to claim 9, characterized in that, The axial limiting retaining ring is a C-type retaining ring (14), and a retaining ring groove is provided on the shaft of the stirring working head (5), and the C-type retaining ring (14) is engaged in the retaining ring groove; The stirring head (5) is fitted with a shock-absorbing pad (13), which is axially limited between the sliding bearing sleeve (12) and the C-shaped retaining ring (14), and the inner wall of the sliding bearing sleeve (12) is fitted with a damping rubber sleeve.

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