A table tennis bat handle bevel polishing mechanism

Abstract

The application discloses a table tennis bat handle bevel polishing mechanism and relates to the table tennis bat production technical field.The polishing mechanism comprises a brush wheel body.The brush wheel body is provided with a brush wheel disc, a radially-slidable mounting seat, a polishing brush bundle, a reset elastic element and a limiting disc.The mounting seat is provided with a constraint pin, the limiting disc is provided with a limiting window, and the constraint pin extends into the limiting window.When the brush wheel rotates, centrifugal force makes the mounting seat move outward, and the brush bundle extends out to work, and the root of the brush bundle is supported by the side wall of the constraint groove on the brush wheel disc to prevent bending.The radial limiting position of the constraint pin can be adjusted by rotating the limiting disc, so that the wear of the brush bundle is compensated, and the polishing profile is kept consistent.The mechanism realizes convenient compensation of brush bundle wear, effective enhancement of working rigidity, automatic folding in the non-working state and pressure adjustment through rotation speed, solves the problems of frequent replacement of the brush wheel, complex debugging, low polishing efficiency and easy "hair explosion" of the brush bundle and the like, and significantly improves polishing quality consistency and production efficiency.

Description

Technical Field

[0001] This invention relates to the field of table tennis racket manufacturing technology, and in particular to a mechanism for grinding the beveled surface of a table tennis racket handle. Background Technology

[0002] In the polishing process of the beveled or curved surfaces of table tennis racket handles, high-speed rotating nylon bristle, animal hair, or composite abrasive bristle brush wheels are commonly used. Existing technologies mainly suffer from the following two interrelated drawbacks: The challenges of consistent processing and maintenance costs caused by brush bristle wear: As consumables, brush bristles wear down and shorten after continuous use. When the wear reaches a certain level, the overall profile of the brush wheel changes, making it impossible to guarantee the consistency of the processed surface, necessitating machine shutdown and replacement. After replacing the old brush disc with a new one, due to manufacturing tolerances and initial installation differences, the new brush disc's bristle arc profile and effective length differ from the old one. Equipment parameters (such as rotation speed, feed rate, and relative position) must be readjusted, requiring tedious adjustments to restore the original polishing effect. This not only reduces production efficiency but also makes it difficult to maintain consistent processing quality for batches of products.

[0003] The problems of insufficient rigidity and low efficiency when using long brush bristles: To extend the service life, longer brush bristles are often used. However, when grinding handles with complex curved surfaces, excessively long bristles lack effective lateral support and are prone to excessive bending when subjected to workpiece pressure. This not only leads to insufficient effective grinding pressure transmission and low grinding efficiency, but also causes short bristles to wear out quickly, requiring frequent replacement, resulting in decreased machining accuracy and uneven surface quality.

[0004] In the existing technology, there is a lack of a polishing mechanism that can easily compensate for the length of the bristles after they wear down to maintain processing consistency, while also providing the necessary lateral support for the bristles in the working state to improve rigidity and ensure efficiency. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a mechanism for grinding the beveled surface of a ping-pong paddle handle.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A mechanism for grinding the beveled surface of a ping-pong paddle handle includes a brush wheel body, the brush wheel body comprising: The brush wheel has multiple constraint grooves arranged in a ring array on its outer circular surface, and multiple locking holes are formed on its surface. Mounting base, multiple mounting bases are slidably mounted in each constraint groove, and the mounting bases can move radially along the brush wheel disk, and constraint pins are fixedly mounted on the surface of the mounting bases; The bristle bundles are polished and fixed to the side of the mounting base facing the constraint groove. A reset elastic element is connected between the mounting base and the inner wall of the constraint groove to provide an elastic force that causes the mounting base to move radially inward. A limiting plate is rotatably connected to the brush wheel plate on the same axis. A positioning bolt is threaded on the surface of the limiting plate. The end of the positioning bolt can be inserted into the locking hole. A limiting window is opened on the surface of the limiting plate. The constraint pin extends into the limiting window and constrains the maximum radial outward movement position of each mounting seat through the limiting window. When the brush wheel body rotates, the mounting base, under the action of centrifugal force, overcomes the elastic force of the reset elastic element and moves radially outward to the position defined by the limiting plate, so that the polishing brush bristles extend out to work. When the polishing brush bristles extend out to work, the two opposing inner walls of the constraint groove provide lateral support to the polishing brush bristles to suppress the bending of the polishing brush bristles along the axial direction of the brush wheel, so that the length of the polishing brush bristles can be adjusted after wear and shortening, and solves the contradiction of low efficiency of long bristles and short life of short bristles.

[0007] Preferably, guide blocks are fixedly installed on both opposite inner walls of the constraint groove, and guide grooves are provided on both sides of the mounting base, with the guide grooves sliding along the surface of the guide blocks.

[0008] Preferably, the surface of the brush wheel has a through hole extending along its axial direction, and the constraint pin extends through the through hole into the limiting window.

[0009] Preferably, the limiting window has a first arc-shaped boundary and a second arc-shaped boundary, the center of the first arc-shaped boundary is concentrically arranged with the axis of the brush wheel, and the center of the second arc-shaped boundary is not concentrically arranged with the axis of the brush wheel.

[0010] Under the elastic force of the reset elastic element, the constraint pin is pressed against the first arc-shaped boundary, and when the first arc-shaped boundary rotates with the limiting disk, the distance between the constraint pin and the axis of the brush wheel disk remains unchanged; when the brush wheel body rotates at different speeds, the constraint pin reciprocates in the area between the first arc-shaped boundary and the second arc-shaped boundary.

[0011] The limiting disc rotates at a certain angle, causing the positioning bolts to be inserted into the locking holes at different positions to lock the angle of the limiting disc. The radial position of the constraint pin is restricted by the second arc-shaped boundary. The centrifugal force of the rotating brush wheel body is used to make the polishing bristles extend radially outward to compensate for the wear of the polishing bristles.

[0012] Preferably, the cross-section of the constraint groove is fan-shaped. Before and / or after grinding begins, the brush wheel body rotates at low speed or stops, causing the grinding bristles to retract under the action of the reset elastic element. The narrow inner wall of the constraint groove then squeezes and gathers the grinding bristles, extending the effective service life.

[0013] Preferably, the end of the polishing bristle bundle away from the mounting base forms the outer contour surface of the brush wheel body. The outer contour surface is a concave structure adapted to the inclined surface of the ping-pong paddle handle. The outer contour surface maintains a certain bending resistance under the lateral support of the constraint groove. When polishing the inclined surface of the paddle handle, the operator or automated equipment does not need to rotate or adjust the angle of the paddle handle during the polishing process, which simplifies the operation process.

[0014] The present invention has the following beneficial effects: 1. The grinding mechanism proposed in this invention can synchronously adjust the maximum radial stroke of all mounting seats by rotating and locking the limiting plate, thereby compensating for the length loss caused by brush bristle wear. This mechanical adjustment mechanism replaces the cumbersome process of re-adjusting equipment parameters after replacing the entire brush wheel body, extending the service life of the brush wheel body, ensuring the consistency of the grinding handle bevel profile and processing effect in both new and old brush bristle states, and increasing the number of effectively ground handles per brush wheel body in mass production.

[0015] It is worth mentioning that after a certain number of products are polished by the bristles, the ends of the bristles wear down, and the polished products have a relatively consistent effect. If new bristles are replaced, a break-in period is required to form a stable polished surface. If new brush wheels are frequently replaced, it will disrupt the stability of production and increase the difficulty of quality control.

[0016] 2. The grinding mechanism proposed in this invention features a working grinding bristle bundle whose roots are tightly fitted and supported by the inner walls on both sides of the constraint groove when the brush wheel body rotates at high speed. This structure effectively suppresses the axial bending deformation of the grinding bristle bundle when it is squeezed by the inclined surface of a ping-pong paddle, allowing the grinding pressure to be transmitted to the workpiece surface more effectively. This solves the problem of pressure loss caused by insufficient rigidity of long bristles, while short bristles wear out quickly, and replacing them with new bristles can cause inconsistent processing results. This design resolves the contradiction between long and short bristles and improves grinding efficiency.

[0017] 3. The grinding mechanism proposed in this invention, when the brush wheel body rotates at low speed or stops, the reset elastic element pulls the mounting seat back, causing the entire grinding brush bristle bundle to be retracted into the constraint groove. At this time, the inner wall of the constraint groove exerts a squeezing force on the bristle bundle from both sides towards the center, which can automatically straighten the bristles that have become loose and messy due to work (i.e., the "frizzing" phenomenon). This design reduces manual intervention and maintains the neat working shape of the bristle bundle. In other words, each time the grinding brush bristle bundle extends for work, the concave structure of its outer contour surface matches the inclined surface of the ping-pong paddle handle as closely as possible, extending its effective service life.

[0018] 4. The grinding mechanism proposed in this invention adjusts the grinding contact surface by the rotational speed of the brush wheel body: as the rotational speed increases, the centrifugal force increases, and the extension of the grinding bristles and the contact surface with the workpiece increase accordingly; conversely, as the rotational speed decreases, the centrifugal force decreases, and the extension of the grinding bristles and the contact surface with the workpiece decrease accordingly. Considering that the beveled surface of the handle is not a uniform curved surface and there are raised details (such as anti-slip stripes, patterns, and ridges) that need to be retained, reducing the rotational speed can reduce the grinding contact surface and the grinding speed, meeting the needs of differentiated grinding and providing convenience for fine-tuning the grinding effect. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the grinding mechanism proposed in this invention.

[0020] Figure 2 This is an exploded structural diagram of the grinding mechanism proposed in this invention.

[0021] Figure 3 This is a front view schematic diagram of the brush wheel body proposed in this invention. Figure 1 Among them, the polishing brush bristles are retracted into the constraint groove.

[0022] Figure 4 This is a front view schematic diagram of the brush wheel body proposed in this invention. Figure 2 Among them, the bristles of the polishing brush are in an extended state.

[0023] Figure 5 This is a schematic diagram of the orthographic structure of the brush wheel body proposed in this invention.

[0024] Figure 6 This is a three-dimensional structural diagram of the grinding equipment proposed in this invention.

[0025] Figure 7 This is a side view of the grinding equipment proposed in this invention.

[0026] Figure 8 This is a schematic diagram of the brush wheel body of the present invention grinding the beveled surface of a ping-pong paddle handle.

[0027] In the picture: 100. Brush wheel body; 110. Brush wheel disc; 111. Constraint groove; 112. Locking hole; 113. Guide block; 114. Connecting hole; 120. Mounting base; 121. Restraining pin; 122. Guide groove; 130. Polish the bristle bundles; 131. Outer contour surface; 140. Reset elastic element; 150. Limiting plate; 151. Positioning bolt; 152. Limiting window; 153. First arc-shaped boundary; 154. Second arc-shaped boundary; 200, frame; 300, drive motor. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0029] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limitations on this invention.

[0030] Example 1 A ping-pong paddle handle bevel grinding mechanism includes a brush wheel body 100, such as... Figures 7-8 As shown, the brush wheel body 100 is mounted on the output shaft of the polishing equipment through its central hole. The polishing equipment includes a frame 200, and a drive motor 300 is fixedly mounted on the top of the frame 200. The drive motor 300 drives the output shaft of the polishing equipment to rotate through belt drive.

[0031] like Figures 1-5 As shown, the brush wheel body 100 includes: a brush wheel disc 110, a mounting base 120, a polishing bristle bundle 130, a reset elastic element 140, and a limiting disc 150.

[0032] Specifically, 110 is needed for the roulette wheel refresh. (See reference.) Figure 1 , Figure 2 The outer circular surface of the brush wheel 110 is provided with a plurality of constraint grooves 111 arranged in a ring array. Guide blocks 113 are fixedly installed on the two opposite inner walls of the constraint grooves 111. The surface of the brush wheel 110 is provided with a through hole 114 extending along its axial direction. The surface of the brush wheel 110 is provided with a plurality of locking holes 112.

[0033] Mounting base 120, multiple mounting bases 120 are slidably installed in each constraint groove 111, and the mounting base 120 can move radially along the brush wheel disk 110. A constraint pin 121 is fixedly installed on the surface of the mounting base 120. Guide grooves 122 are provided on both sides of the mounting base 120, and the guide grooves 122 slide along the surface of the guide block 113.

[0034] The abrasive bristle bundle 130, made of wear-resistant nylon filaments or composite abrasive filaments, is densely fixed to the outer end face of the mounting base 120 by adhesive bonding or implantation, i.e., fixed to the side of the mounting base 120 facing the opening of the constraint groove 111. The end of the abrasive bristle bundle 130 away from the mounting base 120 forms the outer contour surface 131 of the brush wheel body 100. The outer contour surface 131 is a concave structure formed by trimming / natural running-in of the ends of the abrasive bristle bundle 130. This concave structure matches the bevel of the ping-pong paddle handle, such as... Figure 1 , Figure 8 As shown; the bristles of the 130-grit abrasive brush will wear down and shorten after continuous use. (Refer to...) Figure 4 The area outside the outer contour surface 131 is the worn part of the polishing bristle bundle 130.

[0035] The reset elastic element 140, connected between the mounting base 120 and the inner wall of the constraint groove 111, provides an elastic force that causes the mounting base 120 to move radially inward; specifically, such as... Figure 5 As shown, the reset elastic element 140 is a helical spring. One end of the spring is fixed to the inner side of the mounting base 120, and the other end is fixed to the inner wall of the constraint groove 111, which always provides the mounting base 120 with a radial inward pulling force pointing towards the axis of the brush wheel disk 110.

[0036] A limiting disc 150 is coaxially rotatably connected to the brush wheel disc 110. A positioning bolt 151 is threaded onto the surface of the limiting disc 150, and the end of the positioning bolt 151 can be inserted into the locking hole 112. Figure 1 As shown, the angle of the limiting plate 150 is limited by the positioning bolt 151; a limiting window 152 is opened on the surface of the limiting plate 150, and the constraint pin 121 extends through the connecting hole 114 into the limiting window 152, thereby limiting the maximum radial outward movement position of each mounting seat 120. When the brush wheel body 100 rotates, the mounting base 120, under the action of centrifugal force, overcomes the elastic force of the reset elastic element 140 and moves radially outward to the position defined by the limiting plate 150, causing the polishing bristle bundle 130 to extend and work. When the polishing bristle bundle 130 extends and works, the two opposing inner walls of the constraint groove 111 provide lateral support to the polishing bristle bundle 130 to inhibit the polishing bristle bundle 130 from bending along the axial direction of the brush wheel disc 110. Figure 8As shown, under the action of two lateral support forces F, the axial bending deformation of the grinding brush bristles 130 when squeezed by the inclined surface of the ping-pong paddle handle is suppressed, so that the grinding pressure can be more effectively transmitted to both sides of the ping-pong paddle handle.

[0037] In this embodiment, as Figure 3 As shown, the limiting window 152 has a first arc-shaped boundary 153 and a second arc-shaped boundary 154. The center of the first arc-shaped boundary 153 is arranged concentrically with the axis of the brush wheel 110, and the center of the second arc-shaped boundary 154 is not arranged concentrically with the axis of the brush wheel 110.

[0038] like Figure 3 As shown, under the elastic force of the reset elastic element 140, the constraint pin 121 presses against the first arc-shaped boundary 153, and when the first arc-shaped boundary 153 rotates with the limit plate 150, the distance between the constraint pin 121 and the axis of the brush wheel 110 remains unchanged; even if the limit plate 150 is adjusted to different angles, the mounting base 120 can be reset to the starting position.

[0039] When the brush wheel body 100 rotates at different speeds, the centrifugal force is different, and the constraint pin 121 moves back and forth in the area between the first arc-shaped boundary 153 and the second arc-shaped boundary 154, providing a certain amount of space for the constraint pin 121 and the mounting base 120 to move.

[0040] like Figure 4 As shown, when the limiting plate 150 rotates at a certain angle, the positioning bolt 151 is inserted into the locking hole 112 at different positions to lock the angle of the limiting plate 150. The radial position of the constraint pin 121 is restricted by the second arc-shaped boundary 154. The centrifugal force of the rotating brush wheel body 100 is used to make the grinding brush bristle bundle 130 extend radially outward to compensate for the wear of the grinding brush bristle bundle 130. That is, the wear compensation amount (preset length) of the grinding brush bristle bundle 130 is achieved by inserting the positioning bolt 151 into the locking hole 112 at different positions for adjustment and operation.

[0041] In this embodiment, before and / or after polishing begins, the brush wheel body 100 rotates at a low speed or stops, causing the polishing bristle bundle 130 to retract under the action of the reset elastic member 140, and the inner wall of the constraint groove 111 squeezes and gathers the polishing bristle bundle 130; it should be noted that, referring to Figure 5The cross-section of the constraint groove 111 is fan-shaped, and its width gradually increases from the inside to the outside. After the brush wheel body 100 stops, the mounting base 120 can be reset to the starting position under the elastic force of the reset elastic element 140. The narrow area in the constraint groove 111 is used to squeeze and polish the bristle bundle 130, generating a squeezing force that gathers from the outside to the center. This squeezing force forces the scattered bristles to gather towards the center. This geometric design allows the gathering effect to occur along the entire length of the polishing bristle bundle 130, rather than just at the root. Each time the polishing bristle bundle 130 extends for work, the concave structure of its outer contour surface 131 matches the inclined surface of the ping-pong paddle handle as closely as possible. Moreover, the fan-shaped constraint groove 111 has a gradually increasing opening, which is beneficial for the extension of the polishing bristle bundle 130.

[0042] Working principle: In the static state, under the action of the reset elastic element 140, the mounting base 120 is located at the innermost side, the constraint pin 121 is in close contact with the first arc-shaped boundary 153 of the limit window 152, and the polishing bristle bundle 130 retracts.

[0043] During operation, the drive motor 300 drives the brush wheel 110 to rotate at high speed. Centrifugal force drives the mounting base 120 to slide outward against the tension of the reset elastic element 140 until the constraint pin 121 presses against the second arc-shaped boundary 154 of the limiting window 152. At this time, the grinding bristle bundle 130 extends to the preset length for grinding. The inner walls on both sides of the constraint groove 111 form an effective lateral constraint on the root of the extended grinding bristle bundle 130, preventing its axial bending and ensuring grinding pressure.

[0044] When the machine stops, the rotation speed decreases, the centrifugal force weakens, the reset elastic element 140 pulls the mounting base 120 back, and the bristle bundle retracts into the constraint groove 111. Its inner wall exerts a squeezing and gathering effect on the polishing bristle bundle 130.

[0045] Example 2 This embodiment describes the method for grinding the beveled surface of a ping-pong paddle handle using the grinding mechanism of Embodiment 1, specifically including the following steps: S1. Initial Setup and Wear Compensation: Based on the wear condition of the abrasive bristle bundle 130, loosen the positioning bolt 151 and slightly rotate the limiting plate 150. Then tighten the positioning bolt 151 so that its end is inserted into the adjacent locking hole 112, completing the angle locking of the limiting plate 150. This operation compensates for wear by changing the reference position of the second arc-shaped boundary 154 and setting a new maximum extension.

[0046] S2. Start-up and polishing: Start the drive motor 300 to accelerate the brush wheel body 100 to the preset working speed (e.g., 300 rpm). Under the action of centrifugal force, each mounting seat 120 moves outward synchronously, the constraint pin 121 presses tightly against the second arc-shaped boundary 154, the polishing bristle bundle 130 extends to the compensated working length, and forms a stable arc-shaped polishing surface.

[0047] S3. Perform the polishing operation: Control the clamp holding the ping-pong paddle handle so that the inclined surface of the ping-pong paddle handle to be polished smoothly passes through the high-speed rotating polishing bristle bundle 130 to complete the polishing. In addition, the grinding contact surface is adjusted by the rotation speed of the brush wheel body 100: as the rotation speed increases, the centrifugal force increases, and the extension of the grinding bristle bundle 130 and the contact surface with the workpiece increase accordingly; conversely, as the rotation speed decreases, the centrifugal force decreases, and the extension of the grinding bristle bundle 130 and the contact surface with the workpiece decrease accordingly, thus meeting the needs of differentiated grinding and providing convenience for fine-tuning the grinding effect. It is worth mentioning that, because the end of the polishing bristle bundle 130 forms a concave outer contour surface 131 that matches the bevel of the target handle during operation, and this outer contour surface 131 maintains a certain degree of bending resistance under the lateral support of the constraint groove 111, when polishing the bevel of the handle, the operator or automated equipment does not need to rotate or adjust the angle of the handle during the polishing process. Figure 8 As shown, by simply pushing the brush handle smoothly under the rotating brush wheel body 100 along the set feed path (usually a straight line), the concave outer contour surface 131 can simultaneously act on both sides and the central area of ​​the brush handle's inclined surface, completing the grinding of the entire composite curved surface in one go. This greatly simplifies the operation process, reduces the dependence on operator skills, and provides conditions for achieving stable and efficient automated mass production.

[0048] S4. Stopping and Brush Retraction: After grinding is completed, the drive motor 300 decelerates to a stop. Under the action of the reset elastic element 140, the mounting base 120 drives the grinding brush bristle bundle 130 to retract, and the inner wall of the constraint groove 111 squeezes the grinding brush bristle bundle 130 to restore its retraction, preparing it for the next operation.

[0049] This method transforms complex wear compensation into simple mechanical adjustment operations and integrates bristle maintenance (bristle retraction) into each work cycle, achieving an efficient, stable, and low-maintenance automated polishing process.

[0050] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A mechanism for grinding the beveled surface of a ping-pong paddle handle, comprising a brush wheel body (100), characterized in that, The brush wheel body (100) includes: The brush wheel (110) has multiple constraint grooves (111) arranged in a ring array on its outer circular surface, and multiple locking holes (112) are provided on its surface. Mounting base (120), multiple mounting bases (120) are slidably installed in each constraint groove (111), and the mounting base (120) can move radially along the brush wheel disk (110), and constraint pins (121) are fixedly installed on the surface of the mounting base (120). A polishing brush bristle bundle (130) is fixed to the side of the mounting base (120) facing the opening of the constraint groove (111); A reset elastic element (140) is connected between the mounting base (120) and the inner wall of the constraint groove (111) to provide an elastic force that causes the mounting base (120) to move radially inward; A limiting disk (150) is rotatably connected to the brush wheel disk (110) on the same axis. A positioning bolt (151) is threaded on the surface of the limiting disk (150). The end of the positioning bolt (151) can be inserted into the locking hole (112). A limiting window (152) is opened on the surface of the limiting disk (150). The constraint pin (121) extends into the limiting window (152) and constrains the maximum radial outward movement position of each mounting seat (120) through the limiting window (152). The limiting window (152) has a first arc-shaped boundary (153) and a second arc-shaped boundary (154). The center of the first arc-shaped boundary (153) is arranged concentrically with the axis of the brush wheel (110), and the center of the second arc-shaped boundary (154) is not arranged concentrically with the axis of the brush wheel (110). Under the elastic force of the reset elastic element (140), the constraint pin (121) presses against the first arc-shaped boundary (153), and when the first arc-shaped boundary (153) rotates with the limiting disk (150), the distance between the constraint pin (121) and the axis of the brush wheel disk (110) remains unchanged; when the brush wheel body (100) rotates at different speeds, the constraint pin (121) moves back and forth in the area between the first arc-shaped boundary (153) and the second arc-shaped boundary (154); The limiting disc (150) rotates at a certain angle, so that the positioning bolt (151) is inserted into the locking hole (112) at different positions to lock the angle of the limiting disc (150). The radial position of the constraint pin (121) is restricted by the second arc-shaped boundary (154). The centrifugal force of the brush wheel body (100) is used to make the polishing bristle bundle (130) extend radially outward to compensate for the wear of the polishing bristle bundle (130). When the brush wheel body (100) rotates, the mounting base (120) moves radially outward under the action of centrifugal force, overcoming the elastic force of the reset elastic element (140), to the position defined by the limiting disk (150), so that the polishing bristle bundle (130) extends out to work; when the polishing bristle bundle (130) extends out to work, the two opposing inner walls of the constraint groove (111) provide lateral support to the polishing bristle bundle (130) to suppress the polishing bristle bundle (130) from bending in the axial direction along the brush wheel disk (110).

2. The ping-pong paddle handle bevel grinding mechanism according to claim 1, characterized in that: Guide blocks (113) are fixedly installed on the two opposite inner walls of the constraint groove (111), and guide grooves (122) are opened on both sides of the mounting base (120). The guide grooves (122) slide along the surface of the guide block (113).

3. The ping-pong paddle handle bevel grinding mechanism according to claim 1, characterized in that: The brush wheel (110) has a through hole (114) extending through it in the axial direction, and the constraint pin (121) extends through the through hole (114) into the limiting window (152).

4. The ping-pong paddle handle bevel grinding mechanism according to claim 1, characterized in that: The cross-section of the constraint groove (111) is fan-shaped. Before and / or after grinding, the brush wheel body (100) rotates at low speed or stops, causing the grinding bristle bundle (130) to retract under the action of the reset elastic member (140), and the narrow inner wall of the constraint groove (111) squeezes and gathers the grinding bristle bundle (130).

5. The ping-pong paddle handle bevel grinding mechanism according to claim 1, characterized in that: The end of the abrasive bristle bundle (130) away from the mounting base (120) forms the outer contour surface (131) of the brush wheel body (100), and the outer contour surface (131) is a concave structure adapted to the inclined surface of the ping-pong paddle handle.

6. A method for grinding the beveled surface of a ping-pong paddle handle using the mechanism described in any one of claims 1-4, characterized in that, Includes the following steps: a) Adjust the maximum movement position by rotating and locking the limiting disc (150) according to the wear amount of the polishing bristle bundle (130); b) Drive the brush wheel body (100) to rotate to the working speed, so that the polishing bristle bundle (130) extends under the action of centrifugal force, or reduce the speed of the brush wheel body (100) and adjust the polishing contact surface at the end of the polishing bristle bundle (130). c) The inclined surface of the ping-pong paddle handle to be polished is smoothly passed under the high-speed rotating polishing bristle bundle (130) and comes into contact with the rotating polishing bristle bundle (130) for polishing.

7. A device for grinding the beveled surface of a ping-pong paddle handle, characterized in that, It includes a frame (200), a drive motor (300), and a ping-pong paddle handle bevel grinding mechanism as described in any one of claims 1-4, wherein the brush wheel body (100) is mounted on the output shaft driven by the drive motor (300).

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