A handpiece anti-suction back structure and dental handpiece

Abstract

The utility model discloses a head anti back suction structure and dental handpiece, this head anti back suction structure includes target base and sealing washer ring, wherein the middle of target base is provided with base through -hole, and the outside shaft core subassembly is worn in the base through -hole, and the inner edge of target base one side end surface is provided with limit card slot part, and the convex part of sealing washer ring is arranged in the limit card slot part, and the sealing part of sealing washer ring is in contact with the outer wall of shaft core subassembly. The utility model discloses a head anti back suction structure is through the convex part of sealing washer ring and is arranged in the limit card slot part of target base, has played the radial and axial location effect of sealing washer ring, can when assembling the shaft core subassembly of dental handpiece, prevent the friction of interference fit between shaft core subassembly and sealing washer ring and make sealing washer ring fall off and cause the assembly misplacement to avoid sealing washer ring damage to improve the sealing performance of sealing washer ring, thereby improve the service life of dental handpiece.

Description

Technical Field

[0001] This utility model relates to the field of dental medical device technology, and in particular to a head anti-backflow structure and a dental handpiece. Background Technology

[0002] Currently, dental handpieces need to be fitted with anti-backflow sealing gaskets at the opening of the handpiece head to prevent external liquids such as blood from entering the handpiece head during use, thereby avoiding corrosion of the internal shaft components and reducing their service life.

[0003] However, in practice, even with anti-backflow sealing gaskets, external liquids such as blood can still enter the dental handpiece, posing a risk of corrosion to the handpiece's core assembly and reducing its lifespan.

[0004] Therefore, improving the sealing performance of the anti-backflow structure of the dental handpiece, thereby extending its service life, has become an urgent problem to be solved. Utility Model Content

[0005] This utility model discloses a dental handpiece anti-backflow structure and a dental handpiece, which can improve the sealing performance of the dental handpiece anti-backflow structure and thus improve the service life of the dental handpiece.

[0006] To achieve the above objectives, this utility model discloses a machine head anti-backflow structure, which includes: The target base has a base through hole in the middle for external shaft core assembly to pass through, and a limit slot is provided at the inner edge of one side end face of the target base. A sealing gasket ring, wherein one end of the outer ring of the sealing gasket ring has a protrusion and one end of the inner ring of the sealing gasket ring has a sealing part, the protrusion is disposed in the limiting groove, and the sealing part abuts against the outer wall of the shaft core assembly.

[0007] As an optional implementation, in an embodiment of the first aspect of this utility model, the limiting slot includes a base groove and a base boss, the base boss being disposed at the inner edge of the base groove; the protruding part of the sealing gasket is placed in the base groove, and the base boss is used to restrict the radial movement of the sealing gasket.

[0008] As an optional implementation, in an embodiment of the first aspect of this utility model, the anti-backflow structure of the machine head further includes: A limiting washer is disposed on one end face of the target base where the limiting slot is provided, and the limiting washer abuts against the protrusion.

[0009] As an optional implementation, in an embodiment of the first aspect of this utility model, the sealing gasket ring is provided with a movable groove at a preset included angle between the protrusion and the sealing portion.

[0010] As an optional implementation, in an embodiment of the first aspect of this utility model, the edge of the outer ring sidewall of the sealing gasket is designed with a chamfer.

[0011] As an optional implementation, in an embodiment of the first aspect of this utility model, the height difference between the top surface of the base boss and the bottom surface of the base groove is not less than 0.05mm.

[0012] Secondly, this utility model discloses a dental handpiece, comprising: The head body has a working cavity and a working opening communicating with the working cavity; As described in the first aspect of this utility model, the anti-backflow structure for the machine head includes a target base disposed at the working opening. A spindle assembly is provided, which passes through the base through hole and the working cavity. The interior of the spindle assembly is used to hold the dental bur to be used. The head body is used to control the spindle assembly to rotate about the central axis of the working cavity, so as to drive the dental bur to rotate.

[0013] As an optional implementation, in an embodiment of the second aspect of this utility model, the head body includes: The housing of the machine head; A rotation control assembly is disposed within the inner cavity of the machine head housing; A spring washer is disposed between the target base and the rotation control assembly.

[0014] As an optional implementation, in an embodiment of the second aspect of this utility model, the inner wall of the base through hole and the outer wall of the shaft core assembly are provided with a preset interval.

[0015] As an optional implementation, in an embodiment of the second aspect of this invention, the rotation control component includes: A wind turbine is sleeved on the outer wall of the shaft core assembly, and the wind turbine is used to control the rotation of the shaft core assembly about the central axis of the working cavity; A bearing assembly is sleeved on the outer wall of the shaft core assembly, and the bearing assembly is used to provide support for the rotation of the shaft core assembly.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: The anti-backflow structure of the dental handpiece provided by this utility model, through the protrusion of the sealing gasket ring set in the limiting groove of the target base, plays a role in limiting the radial and axial direction of the sealing gasket ring. Thus, when assembling the shaft assembly of the dental handpiece, it can prevent the frictional force generated by the interference fit between the shaft assembly and the sealing gasket ring from causing the sealing gasket ring to fall off and resulting in assembly misalignment, and avoid damage to the sealing gasket ring due to deformation and assembly misalignment, thereby improving the sealing performance of the sealing gasket ring.

[0017] The dental handpiece provided by this utility model adopts the aforementioned anti-backflow structure of the handpiece head. The protruding part of the sealing gasket is set in the limiting groove of the target base, which plays a role in limiting the radial and axial direction of the sealing gasket. Thus, when assembling the shaft assembly of the dental handpiece, it can prevent the friction generated by the interference fit between the shaft assembly and the sealing gasket from causing the sealing gasket to fall off and resulting in misalignment. This avoids damage to the sealing gasket and affects the sealing performance, thereby improving the service life of the dental handpiece. Attached Figure Description

[0018] Figure 1 This is a cross-sectional schematic diagram of the dental handpiece in this utility model; Figure 2 This is a cross-sectional view of a specific embodiment of the dental handpiece in this utility model; Figure 3 for Figure 2 An enlarged view of region A in the cross-sectional structure shown.

[0019] The meanings of the reference numerals in the attached figures are as follows: Machine head body 01, shaft core assembly 02, target base 100, base groove 110, base boss 120, sealing gasket ring 200, protrusion 210, sealing part 220, movable groove 230, limiting gasket ring 300, machine head housing 400, rotation control assembly 500, impeller 510, bearing device 520, first bearing 521, second bearing 522, spring washer 600. 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0022] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0023] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0024] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0025] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0026] like Figure 1 As shown, this utility model discloses a machine head anti-backflow structure, which includes a target base 100 and a sealing ring 200. The target base 100 has a base through hole in the middle for the external shaft core assembly 02 to pass through. A limiting groove is provided at the inner edge of one side end face of the target base 100. The outer ring of the sealing ring 200 has a protrusion 210 at one end and a sealing part 220 at one end of the inner ring. The protrusion 210 is disposed in the limiting groove and the sealing part 220 abuts against the outer wall of the shaft core assembly 02.

[0027] In this embodiment, refer to Figure 1 and Figure 2The anti-backflow structure of the dental handpiece is applied to the opening position of the handpiece body 01. The dental handpiece includes a spindle assembly 02, which is installed in the working cavity of the handpiece through the opening at the lower end of the handpiece. The interior of the spindle assembly 02 can hold the dental bur to be used.

[0028] In the prior art, in order to prevent external liquids such as blood from entering the inside of the dental handpiece during use and thus improve the service life of the dental handpiece, the conventional solution is to install a sealing gasket ring 200 with anti-backflow function at the opening of the dental handpiece head. However, this solution still results in the problem that external liquids such as blood can enter the inside of the dental handpiece, leading to a reduction in service life.

[0029] In response, the applicant conducted targeted tests to identify the root cause of external liquids such as blood entering the dental handpiece. The tests revealed that the sealing ring 200 lacked radial restraint. During assembly of the dental handpiece's core assembly 02, the friction generated by the interference fit between the outer wall of the core assembly 02 and the sealing ring 200 easily caused the sealing ring 200 to deform and detach from its original pre-set assembly position, resulting in misalignment. This misalignment, in turn, led to severe deformation and damage to the sealing ring 200, thus reducing its sealing performance. Consequently, external liquids such as blood could still enter the dental handpiece, causing corrosion and reducing its lifespan.

[0030] Based on the experimental findings, the aforementioned new anti-backflow structure for the engine head was proposed and adopted: (Refer to...) Figure 1 The target base 100 is positioned at the opening of the dental handpiece head, and a limiting groove is formed on the inner edge of the upper end face of the target base 100. The sealing ring 200 is made of a flexible and soft material, and the sealing portion 220 at one end of the inner ring of the sealing ring 200 abuts against the outer wall of the shaft assembly 02 to achieve a seal inside the handpiece head. By engaging the protrusion 210 at one end of the outer ring of the sealing ring 200 in the limiting groove, the radial movement of the sealing ring 200 can be limited, thereby preventing the sealing ring 200 from falling off and causing misalignment during the assembly of the dental handpiece shaft assembly 02.

[0031] As can be seen, the anti-backflow structure of the dental handpiece of this invention can radially limit the sealing ring 200, preventing the sealing ring 200 from falling off during the assembly of the dental handpiece shaft assembly 02 and causing misalignment, thus avoiding damage to the sealing ring 200. This improves the sealing performance of the sealing ring 200 and effectively prevents external liquids such as blood from entering the handpiece and damaging the shaft assembly 02 and other components, thereby increasing the service life of the dental handpiece.

[0032] like Figure 2and Figure 3 As shown, in one embodiment, the limiting slot includes a base groove 110 and a base boss 120, with the base boss 120 disposed at the inner edge of the base groove 110; the protrusion 210 of the sealing ring 200 is placed in the base groove 110, and the base boss 120 is used to limit the radial movement of the sealing ring 200.

[0033] In this optional embodiment, refer to Figure 3 The base boss 120 is located on the inner edge of the base groove 110, and the base boss 120 is higher than the bottom surface of the base groove 110. The protrusion 210 of the sealing gasket 200 is placed in the base groove 110. The base boss 120, in conjunction with the side wall of the outer ring of the base groove 110, can limit the radial movement of the sealing gasket 200 by limiting the protrusion 210, thereby preventing the sealing gasket 200 from falling off and causing misalignment during assembly.

[0034] As can be seen, this optional embodiment can also form a radial limit on the protrusion 210 by combining the base boss 120 with the side wall of the outer ring of the base groove 110, thereby avoiding misalignment of the sealing gasket 200 due to detachment, and further improving the sealing performance of the sealing gasket 200.

[0035] like Figure 2 and Figure 3 As shown, in an optional embodiment, the anti-backflow structure of the machine head further includes a limiting pad ring 300, which is disposed on one end face of the target base 100 where a limiting slot is provided, and the limiting pad ring 300 abuts against the protrusion 210.

[0036] In this optional embodiment, refer to Figure 3 The upper end face of the target base 100 is also provided with a limiting washer 300. The limiting washer 300, in conjunction with the bottom surface of the base groove 110, can limit the axial movement of the sealing washer 200 by limiting the protrusion 210, thereby further ensuring that the sealing washer 200 can be installed in the preset assembly position and avoiding misalignment of the sealing washer 200.

[0037] The inner diameter of the limiting washer 300 is smaller than the inner diameter of the side wall of the outer side of the base groove 110. That is, the axial projection of the limiting washer 300 can cover the protrusion 210 of the outer ring of the sealing washer 200, ensuring that the protrusion 210 can be confined in the base groove 110. At the same time, the inner diameter of the limiting washer 300 is larger than the inner diameter of the base boss 120. That is, the axial projection of the limiting washer 300 does not cover the sealing part 220 of the inner ring of the sealing washer 200. This ensures that the limiting washer 300 will not obstruct the sealing part 220, thereby providing sufficient and appropriate deformation space for the sealing washer 200 when assembling the shaft assembly 02 of the dental handpiece, and avoiding damage to the sealing washer 200 due to severe deformation.

[0038] As can be seen, this optional embodiment can also prevent misalignment of the sealing ring 200 by limiting the gasket 300, and can provide sufficient and appropriate deformation space for the sealing ring 200 to avoid damage to the sealing ring 200 due to severe deformation.

[0039] like Figure 2 and Figure 3 As shown, in an optional embodiment, the sealing gasket ring 200 has a movable groove 230 with a preset included angle between the protrusion 210 and the sealing portion 220.

[0040] In this optional embodiment, refer to Figure 3 A movable groove 230 is also provided on one side below the sealing ring 200. This movable groove 230 is specifically located between the protrusion 210 and the sealing part 220. The movable groove 230 is set at a preset included angle. The movable groove 230 serves to prevent interference between the base boss 120 and the bottom surface of the sealing ring 200 during assembly. At the same time, it also ensures that the sealing ring 200 has sufficient and appropriate deformation space, further preventing the sealing ring 200 from being damaged due to severe deformation.

[0041] As can be seen, this optional embodiment can also provide sufficient and suitable deformation space for the sealing gasket 200 by opening a movable groove 230 with a certain included angle on the lower side of the sealing gasket 200, thereby avoiding damage to the sealing gasket 200 due to severe deformation.

[0042] like Figure 2 and Figure 3 As shown, in an optional embodiment, the edge of the outer ring sidewall of the sealing gasket 200 is designed with a chamfer.

[0043] In this optional embodiment, refer to Figure 3 The outer ring of the sealing gasket 200 is a protrusion 210, and both the upper and lower edges of the outer sidewall of the protrusion 210 are designed with chamfers. By cutting along the original right-angled edges of the upper and lower edges of the sidewall, chamfered notches can be formed at the upper and lower edges. The chamfered design of the protrusion 210 of the sealing gasket 200 can provide a certain amount of rotational deformation space for the protrusion 210 within the base groove 110 while ensuring that the range of motion of the protrusion 210 is limited by the base groove 110. In other words, it can provide sufficient and appropriate deformation space for the sealing gasket 200 as a whole, further preventing the sealing gasket 200 from being damaged due to severe deformation.

[0044] As can be seen, this optional embodiment can also provide a certain rotational deformation space for the protrusion 210 in the base groove 110 by the chamfered design of the sealing gasket 200 protrusion 210, thereby further preventing the sealing gasket 200 from being damaged due to severe deformation.

[0045] In an optional embodiment, the height difference between the top surface of the upper end of the base boss 120 and the bottom surface of the base groove 110 is not less than 0.05mm, so as to effectively limit the radial movement of the protrusion 210. The specific value of the height difference may be, but is not limited to, 0.05mm, 0.08mm, 0.1mm, 0.15mm, 0.2mm, 0.26mm, 0.29mm, 0.31mm, 0.33mm, 0.4mm, 0.5mm, 0.56mm, 0.8mm, 0.92mm, 1mm, 1.3mm, etc.

[0046] like Figure 1 and Figure 2 As shown, this utility model also discloses a dental handpiece, which includes: a handpiece body 01, a spindle assembly 02, and the anti-backflow structure of the handpiece described in the above embodiments of this utility model. The handpiece body 01 has a working cavity and a working opening communicating with the working cavity. The target base 100 is disposed at the working opening. The spindle assembly 02 passes through the through hole of the base and the working cavity. The interior of the spindle assembly 02 is used to hold the dental bur to be used. The handpiece body 01 is used to control the spindle assembly 02 to rotate about the central axis of the working cavity, so as to drive the dental bur to rotate.

[0047] In this embodiment, the target base 100 in the anti-backflow structure of the dental handpiece is installed at the opening of the handpiece. The spindle assembly 02 is installed in the working cavity of the handpiece body 01 through the working opening at the lower end of the handpiece body 01 and the base through hole of the target base 100. The interior of the spindle assembly 02 can hold the dental bur to be used. The spindle assembly 02 is rotated by the control device inside the handpiece body 01, so that the spindle assembly 02 drives the dental bur to rotate around the central axis of the working cavity, thereby using the rotating bur to perform related dental surgery.

[0048] As can be seen, in this embodiment, the dental handpiece adopts the aforementioned anti-backflow structure. The protrusion 210 of the sealing ring 200 is set in the limiting groove of the target base 100, which plays a role in limiting the radial and axial direction of the sealing ring 200. Thus, when assembling the shaft core assembly 02 of the dental handpiece, it can prevent the frictional force generated by the interference fit between the shaft core assembly 02 and the sealing ring 200 from causing the sealing ring 200 to fall off and resulting in misalignment. This avoids damage to the sealing ring 200 and affects the sealing performance, thereby improving the service life of the dental handpiece.

[0049] like Figure 2 and Figure 3As shown, in an optional embodiment, the head body 01 includes: a head housing 400, a rotation control component 500, and a spring washer 600. The rotation control component 500 is disposed in the inner cavity of the head housing 400; the spring washer 600 is disposed between the target base 100 and the rotation control component 500.

[0050] In this optional embodiment, the shaft core assembly 02 is installed in the axially arranged inner cavity of the rotation control assembly 500 through the working opening below the head housing 400 and the base through hole of the target base 100. The rotation control assembly 500 can control the shaft core assembly 02 to rotate. A spring washer 600 is provided between the target base 100 and the rotation control assembly 500. The spring washer 600 is made of elastic material, thereby reducing the impact of the vibration generated by the rotation control assembly 500 when controlling the rotation of the shaft core assembly 02 on the sealing performance of the sealing ring 200.

[0051] As can be seen, this optional embodiment can also reduce the impact of the vibration of the rotation control component 500 on the sealing performance of the sealing ring 200 by using the spring washer 600, thereby further improving the sealing performance of the sealing ring 200.

[0052] like Figure 2 As shown, in an optional embodiment, the rotation control assembly 500 includes a fan wheel 510 and a bearing assembly 520. The fan wheel 510 is sleeved on the outer wall of the shaft core assembly 02 and is used to control the rotation of the shaft core assembly 02 about the central axis of the working cavity; the bearing assembly 520 is sleeved on the outer wall of the shaft core assembly 02 and is used to provide support for the rotation of the shaft core assembly 02.

[0053] In this optional embodiment, refer to Figure 2 The impeller 510 and the shaft assembly 02 are coaxially arranged. The head housing 400 is connected to the air chamber of the dental handpiece. The air chamber allows high-speed airflow into the inner cavity of the head housing 400, causing the impeller 510 to rotate around the central axis of the working cavity, thereby controlling the shaft assembly 02 to drive the dental bur to rotate. When the shaft assembly 02 rotates, the bearing device 520 sleeved on the shaft assembly 02 provides corresponding support.

[0054] like Figure 2 and Figure 3 As shown, in an optional embodiment, the inner wall of the base through hole and the outer wall of the shaft core assembly 02 are spaced apart by a preset interval.

[0055] In this optional embodiment, refer to Figure 3There is a predetermined gap between the outer wall of the shaft core assembly 02 and the inner wall of the base through hole of the target base 100. Since the impeller 510 is driven to rotate by high-speed airflow, the airflow in the inner cavity of the head housing 400 can push the sealing part 220 of the sealing gasket ring 200 downward, so that the airflow in the inner cavity of the head housing 400 can be discharged to the outside through the gap between the shaft core assembly 02 and the base through hole. At the same time, the airflow can also be used to remove external liquids such as blood accumulated in the base through hole and the bottom of the sealing gasket ring 200, so as to achieve efficient utilization of airflow.

[0056] like Figure 2 As shown, in an optional embodiment, the bearing assembly 520 includes a first bearing 521 and a second bearing 522. The first bearing 521 is sleeved on the end of the shaft core assembly 02 near the target base 100, and a spring washer 600 is disposed between the target base 100 and the first bearing 521; the second bearing 522 is sleeved on the end of the shaft core assembly 02 away from the target base 100, and a fan wheel 510 is disposed between the first bearing 521 and the second bearing 522.

[0057] In this optional embodiment, a first bearing 521 is fitted onto the lower end of the shaft core assembly 02, and a second bearing 522 is fitted onto the upper end of the shaft core assembly 02. Sufficient distance is provided between the first bearing 521 and the second bearing 522 for the installation of the impeller 510. A spring washer 600 is specifically disposed below the first bearing 521 and above the limiting washer 300 to reduce the impact of the vibration of the first bearing 521 on the sealing performance of the sealing washer 200 when the shaft core assembly 02 rotates.

[0058] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A head anti-backflow structure, characterized in that, The anti-backflow structure of the machine head includes: The target base has a base through hole in the middle for external shaft core assembly to pass through, and a limit slot is provided at the inner edge of one side end face of the target base. A sealing gasket ring, wherein one end of the outer ring of the sealing gasket ring has a protrusion and one end of the inner ring of the sealing gasket ring has a sealing part, the protrusion is disposed in the limiting groove, and the sealing part abuts against the outer wall of the shaft core assembly.

2. The anti-backflow structure for the machine head according to claim 1, characterized in that, The limiting slot includes a base groove and a base boss, with the base boss located at the inner edge of the base groove; the protruding part of the sealing gasket is placed in the base groove, and the base boss is used to restrict the radial movement of the sealing gasket.

3. The anti-backflow structure for the machine head according to claim 2, characterized in that, The anti-backflow structure of the machine head also includes: A limiting washer is disposed on one end face of the target base where the limiting slot is provided, and the limiting washer abuts against the protrusion.

4. The anti-backflow structure for the machine head according to any one of claims 1 to 3, characterized in that, The sealing ring has a movable groove with a preset included angle between the protrusion and the sealing part.

5. The anti-backflow structure for the machine head according to any one of claims 1 to 3, characterized in that, The outer ring sidewall of the sealing gasket has a chamfered edge design.

6. The anti-backflow structure for the machine head according to claim 2 or 3, characterized in that, The height difference between the top surface of the base boss and the bottom surface of the base groove is not less than 0.05mm.

7. A dental handpiece, characterized in that, The dental handpiece includes: The head body has a working cavity and a working opening communicating with the working cavity; The anti-backflow structure for the machine head as described in any one of claims 1 to 6, wherein the target base is disposed at the working opening; A spindle assembly is provided, which passes through the base through hole and the working cavity. The interior of the spindle assembly is used to hold the dental bur to be used. The head body is used to control the spindle assembly to rotate about the central axis of the working cavity, so as to drive the dental bur to rotate.

8. The dental handpiece according to claim 7, characterized in that, The head unit includes: The housing of the machine head; A rotation control assembly is disposed within the inner cavity of the machine head housing; A spring washer is disposed between the target base and the rotation control assembly.

9. The dental handpiece according to claim 7, characterized in that, The inner wall of the base through hole and the outer wall of the shaft core assembly are spaced at a preset interval.

10. The dental handpiece according to claim 8, characterized in that, The rotation control component includes: A wind turbine is sleeved on the outer wall of the shaft core assembly, and the wind turbine is used to control the rotation of the shaft core assembly about the central axis of the working cavity; A bearing assembly is sleeved on the outer wall of the shaft core assembly, and the bearing assembly is used to provide support for the rotation of the shaft core assembly.

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