Bearing structure of grinding machine

Abstract

The utility model provides a polisher bearing structure which comprises an outer cylinder body installed inside a manicure polishing pen, a center shaft is coaxially installed inside the outer cylinder body, a step is arranged on the outer side of the center shaft, a large bearing and a small bearing are sleeved at the upper end and the lower end close to the step respectively, and the outer walls of the large bearing and the small bearing are both connected with the inner wall of the outer cylinder body. The top end of the outer barrel is connected with a locking cover, and one end of the locking cover abuts against the outer ring of the large bearing; and an O-shaped ring I and an O-shaped ring II are respectively mounted on the outer side of the locking cover and the outer side of the bottom end of the outer barrel body. According to the utility model, the central shaft with the step is coaxially arranged in the outer cylinder body, the large bearing and the small bearing are directly sleeved at the upper end and the lower end of the step, the locking cover is matched, and the inner supporting cylinder body and the clamping ring are arranged, so that the bearing supporting and fixing mode is obviously simplified, and the working noise generated by complex structure, friction and vibration during high-speed rotation is effectively reduced; the working environment of a manicracer is improved; and the comfort level of a customer is improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of nail polishing machines, and more specifically, it relates to a bearing structure for a polishing machine. Background Technology

[0002] The nail file pen is a professional-grade handheld power tool focused on the finer details of nail services. It is widely used for the precise filing, shaping, and polishing of natural nails and various types of artificial nails (including gel nails, acrylic nails, and nail tips). It can also handle tasks such as trimming the skin around the nails and removing artificial nails. Its core power comes from a built-in miniature high-speed motor, which generates powerful rotational force. This force is efficiently transmitted to the filing head interface via a precision drive shaft, driving the filing head to perform various tasks. To support this high-speed rotating drive shaft and ensure its stability and concentricity, the nail file pen typically incorporates two sets of precision bearings. These bearings significantly reduce frictional loss and are key components for achieving smooth and efficient operation.

[0003] However, the bearing structure inside existing nail file pens is often relatively complex. A significant drawback of this complexity is the generation of considerable noise during operation. Continuous noise can not only disrupt the nail technician's working environment but also affect the customer's comfort, negatively impacting overall user satisfaction. Therefore, this paper researches and improves upon existing structures and their shortcomings to provide a nail file bearing structure with greater practical value. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a grinding machine bearing structure, which is achieved by the following specific technical means:

[0005] A nail polisher bearing structure includes an outer cylinder installed inside a nail polishing brush. A central shaft is coaxially mounted inside the outer cylinder. A step is provided on the outer side of the central shaft, and a large bearing and a small bearing are respectively fitted at the upper and lower ends near the step. The outer walls of the large bearing and the small bearing are connected to the inner wall of the outer cylinder. A locking cap is connected to the top of the outer cylinder, and one end of the locking cap abuts against the outer ring of the large bearing. O-ring one and O-ring two are respectively installed on the outer side of the locking cap and the outer side of the bottom end of the outer cylinder.

[0006] Furthermore, the bottom end of the outer cylinder is provided with a through hole for the bottom end of the central shaft to pass through, and the small bearing is located on the top side of the through hole.

[0007] Furthermore, an inner support cylinder is provided between the large bearing and the small bearing, and the upper and lower ends of the inner support cylinder are respectively abutted against the outer rings of the large bearing and the small bearing.

[0008] Furthermore, the top of the outer cylinder is provided with a threaded opening, and the bottom outer side of the locking cap is provided with an external thread for threaded connection.

[0009] Furthermore, annular grooves are provided on the outer side of the locking cap and the outer side of the bottom end of the outer cylinder, respectively for mounting O-ring one and O-ring two.

[0010] Furthermore, a connecting shaft is threadedly connected to the top of the central shaft.

[0011] Furthermore, the central shaft is a hollow shaft for mounting the silicone tube; the bottom end of the hollow shaft is provided with a constriction to restrict the silicone tube and the connecting rod connecting the grinding head.

[0012] Furthermore, a retaining ring is fitted between the bottom side of the central shaft near the large bearing and the step, with the top side of the retaining ring abutting against the inner ring of the large bearing.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] This invention significantly simplifies the bearing support and fixing method by coaxially installing a stepped central shaft inside the outer cylinder, directly mounting large and small bearings at the upper and lower ends of the step, and using a locking cap, inner support cylinder, and retaining ring. This effectively reduces the working noise caused by complex structure, friction, and vibration during high-speed rotation, improves the working environment for nail technicians, and enhances customer comfort. The structure is also relatively simple, making it easy to manufacture and assemble. Simultaneously, the steps, locking cap, retaining ring, and inner support cylinder work together to ensure the operational stability and concentricity of the central shaft and bearing assembly, reducing abnormal vibration and friction loss, and improving power transmission efficiency and equipment lifespan. Attached Figure Description

[0015] Figure 1 This is an exploded view of the structure of this utility model.

[0016] Figure 2 This is an assembly diagram of the present invention.

[0017] Figure 3 This is a three-dimensional structural diagram of the present invention.

[0018] In the diagram, the correspondence between component names and drawing numbers is as follows:

[0019] 1. Outer cylinder; 2. Central shaft; 3. Small bearing; 4. Inner support cylinder; 5. Snap ring; 6. Large bearing; 7. Locking cover; 8. Connecting shaft; 9. O-ring one; 10. O-ring two. Detailed Implementation

[0020] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0021] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] Example:

[0024] As attached Figure 1 To be continued Figure 3 As shown:

[0025] This utility model provides a bearing structure for a nail polisher, including an outer cylinder 1 installed inside a nail polishing brush. A central shaft 2 is coaxially mounted inside the outer cylinder 1. A step is provided on the outer side of the central shaft 2, and a large bearing 6 and a small bearing 3 are respectively fitted at the upper and lower ends near the step. The outer walls of both the large and small bearings 6 and 3 are connected to the inner wall of the outer cylinder 1. The step structure on the central shaft 2 provides a precise axial positioning reference for the bearings. The large and small bearings 6 and 3 are directly fitted onto the upper and lower ends of the step and are tightly constrained. Their outer walls are interference-fitted with the inner wall of the outer cylinder 1, achieving high-precision dual-point support for the central shaft 2. This effectively ensures rotational concentricity and reduces vibration and noise caused by eccentricity or looseness. A locking cap 7 is connected to the top of the outer cylinder 1, and one end of the locking cap 7 abuts against the outer ring of the large bearing 6. The locking cover 7 axially presses against the outer ring of the large bearing 6, providing a crucial adjustable axial preload, eliminating axial clearance of the large bearing 6, ensuring its working stability and rigidity, preventing axial movement during high-speed rotation, and further reducing noise and vibration. O-rings 9 and 10 are respectively installed on the outer side of the locking cover 7 and the bottom outer side of the outer cylinder 1. When the entire assembly is installed inside the nail polishing pen, it can form an elastic and tight contact with the inner wall of the pen, achieving a "soft connection", thereby helping to reduce noise and vibration.

[0026] The bottom end of the outer cylinder 1 is provided with a through hole for the bottom end of the central shaft 2 to pass through, and the small bearing 3 is located on the top side of the through hole.

[0027] An inner support cylinder 4 is provided between the large bearing 6 and the small bearing 3. The upper and lower ends of the inner support cylinder 4 are respectively abutted against the outer rings of the large bearing 6 and the small bearing 3 to rigidly determine the axial distance between the outer rings of the two bearings and ensure the stability of the bearing preload state. At the same time, it can greatly improve the ability of the entire bearing structure to resist radial and axial deformation and improve the load distribution, which helps to evenly distribute the radial load.

[0028] The outer cylinder 1 has a threaded opening at its top, and the locking cover 7 has an external thread for connection at its bottom outer side. The locking cover 7 is installed and fixed by means of threaded connection, which is convenient for installation and disassembly and easy for maintenance.

[0029] Among them, the outer side of the locking cover 7 and the outer side of the bottom end of the outer cylinder 1 are provided with annular grooves, which are used to hold O-ring 9 and O-ring 10 respectively. The annular groove design provides a standard, reliable and firm installation position for O-ring 9 and O-ring 10, ensuring that the O-rings are accurately positioned and embedded in the grooves, and are not easy to shift or fall off in the working state.

[0030] The central shaft 2 is a hollow shaft used to install the silicone tube; the bottom end of the hollow shaft is provided with a constriction to restrict the silicone tube and the connecting rod connecting the grinding head; a retaining ring 5 is fitted between the bottom side of the central shaft 2 near the large bearing 6 and the step, and the top side of the retaining ring 5 abuts against the inner ring of the large bearing 6.

[0031] The top of the central shaft 2 is connected to a connecting shaft 8 via a thread, which facilitates quick disassembly and allows for the installation and replacement of the internal silicone tube.

[0032] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A bearing structure for a nail polisher, comprising an outer cylinder (1) installed inside a nail polishing brush, characterized in that: The outer cylinder (1) is coaxially mounted with a central shaft (2). A step is provided on the outside of the central shaft (2), and a large bearing (6) and a small bearing (3) are respectively fitted at the upper and lower ends near the step. The outer walls of the large bearing (6) and the small bearing (3) are connected to the inner wall of the outer cylinder (1). A locking cover (7) is connected to the top of the outer cylinder (1). One end of the locking cover (7) is abutted against the outer ring of the large bearing (6). O-ring one (9) and O-ring two (10) are respectively installed on the outer side of the locking cover (7) and the outer side of the bottom end of the outer cylinder (1).

2. The bearing structure of the grinding machine as described in claim 1, characterized in that: The bottom end of the outer cylinder (1) is provided with a through hole for the bottom end of the central shaft (2) to pass through, and the small bearing (3) is located on the top side of the through hole.

3. The bearing structure of the grinding machine as described in claim 1, characterized in that: An inner support cylinder (4) is provided between the large bearing (6) and the small bearing (3), and the upper and lower ends of the inner support cylinder (4) are respectively abutted against the outer rings of the large bearing (6) and the small bearing (3).

4. The bearing structure of the grinding machine as described in claim 1, characterized in that: The top of the outer cylinder (1) is provided with a threaded opening, and the bottom outer side of the locking cover (7) is provided with an external thread for threaded connection.

5. The bearing structure of the grinding machine as described in claim 1, characterized in that: The outer side of the locking cover (7) and the outer side of the bottom end of the outer cylinder (1) are provided with annular grooves, which are used to clamp O-ring one (9) and O-ring two (10) respectively.

6. The bearing structure of the grinding machine as described in claim 1, characterized in that: The top end of the central shaft (2) is connected to a connecting shaft (8) by a thread.

7. The bearing structure of the grinding machine as described in claim 1, characterized in that: The central shaft (2) is a hollow shaft used to install the silicone tube; the bottom end of the hollow shaft is provided with a constriction to restrict the silicone tube and the connecting rod connecting the grinding head.

8. The bearing structure of the grinding machine as described in claim 1, characterized in that: The central shaft (2) has a retaining ring (5) fitted between the bottom side near the large bearing (6) and the step, and the top side of the retaining ring (5) abuts against the inner ring of the large bearing (6).

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