A base for a table tennis practice device, a table tennis practice device, and its manufacturing method

Abstract

The table tennis training device base provided by this invention comprises only three components: a plastic base, a metal counterweight plate, and an adhesive layer. It features a simple structure, few components, and easy assembly. By providing a through hole with a diameter matching the lower end diameter of the elastic flexible shaft, the flexible shaft can be easily inserted. The presence of the surrounding plate facilitates easy removal of the base. The cavity formed between the inner wall of the surrounding plate and the lower surface of the circular support plate can also accommodate the protruding portion of the lower end of the elastic flexible shaft, facilitating a secure connection between the flexible shaft and the base. The table tennis training device provided by this invention, including the elastic flexible shaft and the aforementioned base, allows for easy insertion and fixation of the lower end of the elastic flexible shaft within the through hole, enabling direct connection between the lower end of the flexible shaft and the counterweight plate. It features a simple structure, few components, easy assembly, and good stability after assembly. The manufacturing method of the table tennis training device provided by this invention is simple and convenient for both base fabrication and connecting the elastic flexible shaft, making it suitable for mass production.

Description

Technical Field

[0001] This invention relates to the field of sporting goods, specifically to a base for a table tennis training device, a table tennis training device, and a method for manufacturing the same. Background Technology

[0002] Table tennis is a sport suitable for all ages and can be widely used by people of different ages. When practicing, it requires two people on a table tennis table. However, because table tennis tables take up a lot of space and it is sometimes difficult to find a practice partner of equal skill, it is more difficult to practice alone.

[0003] To address this issue, table tennis practice devices designed for individual practice have emerged on the market. These devices typically consist of a base, a flexible shaft, and a table tennis ball. The base usually comprises a weight plate and an anti-slip pad. The lower end of the flexible shaft connects to the weight plate, and the upper end connects to the table tennis ball, thus accommodating individual practice. However, these table tennis practice devices have at least the following drawbacks:

[0004] 1. The base is relatively thin, making it inconvenient to pick up when moving the table tennis training device. If the elastic flexible shaft is lifted directly, a large pulling force will be applied to the connection between the elastic flexible shaft and the counterweight plate, which may easily pull the elastic flexible shaft away from the counterweight plate.

[0005] 2. The gap between the connection between the elastic flexible shaft and the counterweight plate and the ground is small. If the lower end of the elastic flexible shaft does not extend downward, it is difficult to achieve a stable connection. If it does extend, it is easy to form a protrusion, which will prevent the base from being placed flat.

[0006] To address the aforementioned issues, table tennis training devices with a chassis-supported base have emerged on the market. By increasing the gap between the counterweight and the ground through the chassis, it is easier to remove the chassis and connect the elastic rod to the base. For example, Chinese patent CN217794400U discloses such a table tennis training device. However, this type of table tennis training device requires additional bolts, fasteners, and fixing tubes to connect the counterweight to the chassis and the elastic rod to the counterweight. The structure is complex, with many parts, and assembly is inconvenient, making it unsuitable for mass production. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a table tennis training device base, a table tennis training device with a simple structure, few parts, and easy assembly, as well as a method for manufacturing a table tennis training device suitable for mass production.

[0008] To achieve the above objectives, the product provided by this invention is a table tennis practice device base, comprising:

[0009] A plastic chassis, the plastic chassis being an inverted disc shape, the plastic chassis including a circular support plate and a surrounding plate extending downward and outward from the periphery of the circular support plate, the inner wall of the surrounding plate and the lower surface of the circular support plate forming a cavity;

[0010] A metal counterweight plate, wherein the projection of the metal counterweight plate in the vertical direction is a circle or a regular polygon;

[0011] The upper surface of the circular support plate is provided with a groove for accommodating the metal counterweight plate. The lower surface of the metal counterweight plate and / or the bottom wall of the groove are provided with an adhesive layer. The groove depth is equal to the sum of the thickness of the adhesive layer and the thickness of the metal counterweight plate. When the metal counterweight plate is placed in the groove, the lower surface of the metal counterweight plate is bonded to the bottom wall of the groove through the adhesive layer. The upper surface of the metal counterweight plate is flush with the upper surface of the plastic base. The ping-pong ball training device base also includes a through hole penetrating the center of the bottom wall of the groove, the center of the adhesive layer, and the center of the metal counterweight plate. The through hole is used to insert a flexible shaft supporting the ping-pong ball. The diameter of the through hole matches the diameter of the lower end of the flexible shaft.

[0012] Preferably, the adhesive layer covers the bottom wall of the groove, or the adhesive layer consists of at least two double-sided tapes symmetrically distributed on both sides of the center of the bottom wall of the groove.

[0013] Preferably, when the projection of the metal counterweight plate in the vertical direction is a regular polygon, the corners of the metal counterweight plate are provided with a first rounded chamfer.

[0014] Preferably, the sidewall of the groove is in contact with the sidewall of the metal counterweight plate.

[0015] More preferably, the groove edge is provided with a second rounded chamfer to facilitate the placement and removal of the metal counterweight plate.

[0016] Preferably, the plastic chassis further includes a skirt that is connected to the lower end of the side panel and extends horizontally in all directions, the width of the skirt being not less than 2mm.

[0017] Preferably, the height of the cavity is 13-17 mm.

[0018] Preferably, the diameter of the through hole is 4-6 mm.

[0019] Preferably, the diameter of the upper surface of the circular support plate is 170-180 mm.

[0020] More preferably, the distance between the sidewall of the groove and the outer circumferential surface of the circular support plate is 10-15 mm.

[0021] Preferably, the groove depth is 2.5-3.5mm and the metal counterweight plate thickness is 2.0-3.0mm.

[0022] Preferably, the plastic chassis is a PPC plastic chassis, and the metal counterweight plate is a stainless steel plate.

[0023] To achieve the above objectives, the product in the technical solution provided by the present invention is a table tennis training device, including a flexible shaft and a base for supporting the flexible shaft. The base is any of the table tennis training device bases mentioned above. The lower end of the flexible shaft is inserted into and fixed in the through hole, so that the lower end of the flexible shaft is directly connected to the metal counterweight plate.

[0024] Preferably, the lower end of the elastic flexible shaft is provided with a first annular flange and a second annular flange. The first annular flange is located above the metal counterweight plate and abuts against the upper surface of the metal counterweight plate, and the second annular flange is located inside the cavity and abuts against the lower surface of the circular support plate.

[0025] More preferably, the second annular flange is formed by heat-melting the lower end of the elastic flexible shaft.

[0026] More preferably, the lower end of the elastic flexible shaft is fitted with an elastic expansion plug, which passes through the through hole. The longitudinal section of the elastic expansion plug is I-shaped. The upper surface of the upper end of the elastic expansion plug and the lower surface of the lower end of the elastic expansion plug respectively abut against the first annular flange and the second annular flange. The lower surface of the upper end of the elastic expansion plug and the upper surface of the lower end of the elastic expansion plug respectively abut against the upper surface of the metal counterweight plate and the lower surface of the circular support plate.

[0027] To achieve the above objectives, the method provided by this invention is a method for manufacturing the aforementioned table tennis practice device, comprising the following steps:

[0028] S1. Insert the lower end of the elastic flexible shaft into the through hole in the center of the metal counterweight plate, so that the first annular flange on the lower end of the elastic flexible shaft abuts against the upper surface of the metal counterweight plate, and the lower end of the elastic flexible shaft protrudes from the lower surface of the metal counterweight plate to form a guide head;

[0029] S2. Apply double-sided adhesive to the lower surface of the metal counterweight plate, avoiding the guide head formed in step S1 during the application process;

[0030] S3. Insert the guide head formed in step S1 into the through hole in the center of the groove on the plastic base, so that a part of the guide head protrudes from the lower surface of the circular support plate of the plastic base, so that the metal counterweight plate is located above the groove on the plastic base, and then press the metal counterweight plate with double-sided adhesive into the groove on the plastic base, so that the metal counterweight plate is bonded to the groove of the plastic base to form the base;

[0031] S4. The portion of the guide head protruding from the lower surface of the circular support plate is heat-melted to form the second annular flange that abuts against the lower surface of the circular support plate;

[0032] S5. Connect the ping-pong ball to the upper end of the elastic flexible shaft to obtain the ping-pong ball training device.

[0033] To achieve the above objectives, the method provided by this invention is a method for manufacturing the aforementioned table tennis practice device, comprising the following steps:

[0034] S1. Apply double-sided adhesive to the lower surface of the metal counterweight plate, avoiding the through hole in the center of the metal counterweight plate during application;

[0035] S2. Press the metal counterweight plate with double-sided adhesive into the groove on the plastic base, so that the metal counterweight plate is bonded to the groove on the plastic base to form the base;

[0036] S3. The elastic expansion plug with an I-shaped longitudinal section is fitted onto the lower end of the elastic flexible shaft, so that the upper surface of the upper end of the elastic expansion plug and the lower surface of the lower end of the elastic expansion plug respectively abut against the first annular flange and the second annular flange on the elastic flexible shaft;

[0037] S4. The elastic expansion plug is squeezed into the through hole in the center of the metal counterweight plate and the through hole in the center of the groove, so that the lower surface of the upper end of the elastic expansion plug and the upper surface of the lower end of the elastic expansion plug respectively abut against the upper surface of the metal counterweight plate and the lower surface of the circular support plate.

[0038] S5. Connect the ping-pong ball to the upper end of the elastic flexible shaft to obtain a ping-pong practice device.

[0039] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0040] The table tennis training device base provided by this invention comprises only three components: a plastic base, a metal counterweight plate, and an adhesive layer for bonding the metal counterweight plate to a groove in a circular support plate of the plastic base. It features a simple structure, few components, and easy assembly. By providing a through hole penetrating the center of the groove bottom wall, the center of the adhesive layer, and the center of the metal counterweight plate, the diameter of the through hole matches the diameter of the lower end of the elastic flexible shaft. This allows for convenient insertion of the elastic flexible shaft supporting the table tennis ball. The presence of the plastic base enclosure facilitates easy removal of the base. Furthermore, the cavity formed between the inner wall of the enclosure and the lower surface of the circular support plate can accommodate the protruding portion of the lower end of the elastic flexible shaft, facilitating a secure connection between the elastic flexible shaft and the base.

[0041] The table tennis training device provided by the present invention includes a flexible elastic shaft supporting a table tennis ball and a base supporting the flexible elastic shaft. By making the base any of the above-mentioned bases, the lower end of the flexible elastic shaft can be easily inserted and fixed in the through hole, so that the lower end of the flexible elastic shaft can be directly connected to the counterweight plate. The structure is simple, with few parts, easy to assemble, and has good stability after assembly.

[0042] The method for manufacturing the table tennis training device provided by this invention is simple and convenient for making the base and connecting the elastic flexible shaft, suitable for mass production, and can be well integrated with online sales. Attached Figure Description

[0043] Figure 1 This is a top view schematic diagram of Embodiment 1 of the table tennis practice device base in this invention.

[0044] Figure 2 yes Figure 1 Cross-sectional view along the AA direction.

[0045] Figure 3 yes Figure 2 A magnified view of a portion of point B in the middle.

[0046] Figure 4 This is Embodiment 2 of the table tennis practice device base in the present invention. Figure 1 Cross-sectional view along the AA direction.

[0047] Figure 5 yes Figure 4 A magnified view of a portion of point C.

[0048] Figure 6 This is a top view schematic diagram of Embodiment 3 of the table tennis practice device base in this invention.

[0049] Figure 7 This is a cross-sectional schematic diagram of Embodiment 1 of the table tennis training device of the present invention.

[0050] Figure 8 This is a cross-sectional schematic diagram of Embodiment 2 of the table tennis training device of the present invention.

[0051] The components are: 1. base; 2. flexible shaft; 3. first annular flange; 4. second annular flange; 5. elastic expansion plug; 10. plastic chassis; 11. circular support plate; 111. groove; 112. second rounded chamfer; 12. enclosure plate; 13. cavity; 14. skirt; 20. metal counterweight plate; 21. first rounded chamfer; 30. adhesive layer; 40. through hole. Detailed Implementation

[0052] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0053] The table tennis practice device base provided by this invention includes the following three embodiments.

[0054] Example 1, as Figures 1 to 3 As shown, the table tennis training device base provided by the present invention includes: a plastic base plate 10, a metal counterweight plate 20, an adhesive layer 30, and a through hole 40. The plastic base plate 10 is an inverted disc shape, comprising a circular support plate 11 and a surrounding plate 12 extending downwards and outwards from the periphery of the circular support plate 11. A cavity 13 is formed between the inner wall of the surrounding plate 12 and the lower surface of the circular support plate 11. The metal counterweight plate 20 has a circular projection in the vertical direction and a thickness of 2.6 mm. A groove 111 for accommodating the metal counterweight plate 20 is provided on the upper surface of the circular support plate 11. The adhesive layer 30 is disposed on the metal counterweight plate 20. The lower surface of the counterweight plate 20 and / or the bottom wall of the groove 111, the groove depth of which is equal to the sum of the thickness of the adhesive layer 30 and the metal counterweight plate 20, when the metal counterweight plate 20 is placed in the groove 111, the lower surface of the metal counterweight plate 20 is bonded to the bottom wall of the groove 111 through the adhesive layer 30 to achieve fixation, and the upper surface of the metal counterweight plate 20 is flush with the upper surface of the plastic base plate 10; the through hole 40 passes through the center of the metal counterweight plate 20, the center of the adhesive layer 30 and the center of the bottom wall of the groove 111 from top to bottom, the through hole 40 is used to insert the elastic flexible shaft supporting the ping-pong ball, and the diameter of the through hole 40 matches the diameter of the lower end of the elastic flexible shaft.

[0055] The advantage of this design is that it simplifies the structure of the table tennis training device base, making it simple, with fewer parts, and easy to assemble. It optimizes the connection between the elastic flexible shaft and the table tennis training device base, allowing for easy insertion of the elastic flexible shaft to support the table tennis ball. Due to the presence of the plastic base enclosure, the base can be easily removed. Since a cavity is formed between the inner wall of the enclosure and the lower surface of the circular support plate, it can also accommodate the protruding part of the lower end of the elastic flexible shaft, facilitating the fixed connection between the elastic flexible shaft and the base.

[0056] In this embodiment, the adhesive layer 30 covers the bottom wall of the groove 111 and / or the lower surface of the metal counterweight plate 20. The adhesive layer 30 is preferably double-sided adhesive or structural adhesive. After the metal counterweight plate 20 is bonded to the bottom wall of the groove 111, the side wall of the groove 111 is in contact with the side wall of the metal counterweight plate 20. To facilitate the disassembly and assembly of the metal counterweight plate 20, the groove edge of the groove 111 is further provided with a second rounded chamfer 112 to facilitate the placement and removal of the metal counterweight plate 20.

[0057] In this embodiment, the plastic base 10 also includes a skirt 14 connected to the lower end of the surrounding plate 112 and extending horizontally in all directions. The skirt 14 is used to increase the contact area between the table tennis training device base 1 and the ground. The width of the skirt 14 is not less than 2 mm, preferably 2.5-3.0 mm. Furthermore, the diameter of the upper surface of the circular support plate 11 is 175 mm. With the same upper surface area of ​​the circular support plate 11, since the surrounding plate 12 extends downward and outward, the contact area between the skirt 14 and the ground can be larger, resulting in better support stability of the table tennis training device base.

[0058] To facilitate the handling of the table tennis training device base and the connection between the lower end of the elastic flexible shaft and the table tennis training device base, the height of the cavity 13 is preferably 13-17mm. In this embodiment, the height is 15mm. The diameter of the through hole is preferably 4-6mm. In this embodiment, the diameter is 5mm.

[0059] To facilitate the installation of the metal counterweight plate 20 and ensure its stability after installation, a distance of 10-15mm is preferably reserved between the side wall of the groove 111 and the outer circumference of the circular support plate 11. In this embodiment, the distance is 12mm. At the same time, the groove depth of the groove 111 should not be too deep or too shallow. The groove depth is preferably 2.5-3.5mm. In this embodiment, the groove depth is 3.0mm.

[0060] To facilitate manufacturing and ensure environmental friendliness, in this embodiment, the plastic chassis 10 is a PPC plastic chassis, and the metal counterweight plate 20 is a stainless steel plate.

[0061] Example 2, as Figure 4 and Figure 5 As shown, Embodiment 2 is basically the same as Embodiment 1, except that in Embodiment 2, the adhesive layer 30 is composed of two double-sided adhesive tapes, which are symmetrically distributed on both sides of the center of the bottom wall of the groove 111.

[0062] Example 3, as Figure 6 As shown, Embodiment 3 is basically the same as Embodiment 1, except that in Embodiment 3, the projection of the metal counterweight plate 20 in the vertical direction is a regular hexagon, and the corners of the metal counterweight plate 20 are provided with a first rounded chamfer 21.

[0063] The table tennis training device provided by this invention includes the following two embodiments.

[0064] Example 1, as Figure 7 As shown, the table tennis training device provided by the present invention includes a flexible shaft 2 for supporting a table tennis ball and a base 1 for supporting the flexible shaft 2. The base 1 is the base of the table tennis training device described above. The flexible shaft 2 is made of resin material. The lower end of the flexible shaft 2 is provided with a first annular flange 3 and a second annular flange 4. The lower end of the flexible shaft 2 is inserted and fixed in the through hole 40. Specifically, the first annular flange 3 is located above the metal counterweight plate 20 and abuts against the upper surface of the metal counterweight plate 20. The second annular flange 4 is located in the cavity 13 and abuts against the lower surface of the circular support plate 11, so that the lower end of the flexible shaft 2 is directly connected to the metal counterweight plate 20.

[0065] The advantage of this design is that it makes the table tennis training device simple in structure, with fewer parts, easy to assemble, and more stable after assembly.

[0066] In this embodiment, the second annular flange 4 is formed by heat melting the lower end of the elastic flexible shaft 2 (the part of the elastic flexible shaft 2 that protrudes downward from the lower surface of the circular support plate 11).

[0067] The present invention also provides a method for manufacturing the table tennis practice device described in Embodiment 1, comprising the following steps:

[0068] S1. Insert the lower end of the elastic flexible shaft into the through hole in the center of the metal counterweight plate, so that the first annular flange on the lower end of the elastic flexible shaft abuts against the upper surface of the metal counterweight plate, and the lower end of the elastic flexible shaft protrudes from the lower surface of the metal counterweight plate to form a guide head;

[0069] S2. Apply double-sided tape to the lower surface of the metal counterweight plate, avoiding the guide head formed in step S1 during application;

[0070] S3. Insert the guide head formed in step S1 into the through hole in the center of the groove on the plastic base, so that a part of the guide head protrudes from the lower surface of the circular support plate of the plastic base, so that the metal counterweight plate is located above the groove on the plastic base, and then press the metal counterweight plate with double-sided adhesive into the groove on the plastic base, so that the metal counterweight plate is bonded to the groove of the plastic base to form a base.

[0071] S4. The portion of the guide head protruding from the lower surface of the circular support plate is heat-melted to form a second annular flange that abuts against the lower surface of the circular support plate;

[0072] S5. Connect the ping-pong ball to the upper end of the elastic flexible shaft to obtain a ping-pong practice device.

[0073] Example 2, as Figure 8 As shown, Embodiment 2 is basically the same as Embodiment 1, except that in Embodiment 2, the elastic flexible shaft 2 further includes an elastic expansion plug 5. Specifically, the elastic expansion plug 5 is sleeved on the lower end of the elastic flexible shaft 2. The longitudinal section of the elastic expansion plug 5 is I-shaped. The upper surface of the upper end of the elastic expansion plug 5 and the lower surface of the lower end of the elastic expansion plug 5 respectively abut against the first annular flange 3 and the second annular flange 4. When assembling into a ping-pong ball training device, the elastic expansion plug 5 is inserted into the through hole 40, so that the lower surface of the upper end of the elastic expansion plug 5 and the upper surface of the lower end of the elastic expansion plug 5 abut against the upper surface of the metal counterweight plate 20 and the lower surface of the circular support plate 11 respectively.

[0074] The advantage of this design is that it eliminates the need to form the second annular flange 4 through heat fusion. The deformation of the elastically expandable plug 5 allows the second annular flange 4 to pass through the through hole 40 and fill and tighten, which is convenient for disassembly and assembly and can achieve a better fixing effect.

[0075] The present invention also provides a method for manufacturing the table tennis practice device described in Embodiment 2, comprising the following steps:

[0076] S1. Apply double-sided tape to the lower surface of the metal counterweight plate, avoiding the through hole in the center of the metal counterweight plate when applying the tape.

[0077] S2. Press the metal counterweight plate with double-sided adhesive into the groove on the plastic base to bond the metal counterweight plate to the groove on the plastic base and form a base.

[0078] S3. Place the I-shaped elastic expansion plug on the lower end of the elastic flexible shaft, so that the upper surface of the upper end of the elastic expansion plug and the lower surface of the lower end of the elastic expansion plug abut against the first annular flange and the second annular flange on the elastic flexible shaft, respectively.

[0079] S4. Insert the elastic expansion plug into the through hole in the center of the metal counterweight plate and the through hole in the center of the groove, so that the lower surface of the upper end of the elastic expansion plug and the upper surface of the lower end of the elastic expansion plug respectively press against the upper surface of the metal counterweight plate and the lower surface of the circular support plate.

[0080] S5. Connect the ping-pong ball to the upper end of the elastic flexible shaft to obtain a ping-pong practice device.

[0081] The method for manufacturing the table tennis training device provided by this invention is simple and convenient for making the base and connecting the elastic flexible shaft, suitable for mass production, and can be well integrated with online sales.

[0082] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A table tennis practice device, comprising: Flexible shaft; The base for supporting the elastic flexible shaft includes an inverted disc-shaped plastic base and a metal counterweight plate whose projection in the vertical direction is circular or regular polygonal. The plastic base includes a circular support plate and a surrounding plate extending downward and outward from the periphery of the circular support plate. The upper surface of the circular support plate is provided with a groove for accommodating the metal counterweight plate. The lower surface of the metal counterweight plate and / or the bottom wall of the groove are provided with an adhesive layer. The groove depth is equal to the sum of the thickness of the adhesive layer and the thickness of the metal counterweight plate. When the metal counterweight plate is placed in the groove, the lower surface of the metal counterweight plate is bonded to the bottom wall of the groove through the adhesive layer. The upper surface of the metal counterweight plate is flush with the upper surface of the plastic base. A cavity is formed between the inner wall of the surrounding plate and the lower surface of the circular support plate. A through hole runs through the center of the bottom wall of the groove, the center of the adhesive layer, and the center of the metal counterweight plate. The through hole is used to insert the elastic flexible shaft that supports the ping-pong ball. Its features are: The flexible shaft is made of resin material. The lower end of the flexible shaft is provided with a first annular flange and a second annular flange. The lower end of the flexible shaft is inserted and fixed in the through hole. The first annular flange is located above the metal counterweight plate and abuts against the upper surface of the metal counterweight plate. The second annular flange is located in the cavity and abuts against the lower surface of the circular support plate. The second annular flange is formed by heat-melting the lower end of the flexible shaft, so that the lower end of the flexible shaft is directly connected to the metal counterweight plate.

2. The table tennis practice device according to claim 1, characterized in that: The lower end of the elastic flexible shaft is fitted with an elastic expansion plug, which passes through the through hole.

3. The table tennis practice device according to claim 2, characterized in that: The longitudinal section of the elastic expansion plug is I-shaped. The upper surface of the upper end of the elastic expansion plug and the lower surface of the lower end of the elastic expansion plug respectively abut against the first annular flange and the second annular flange. The lower surface of the upper end of the elastic expansion plug and the upper surface of the lower end of the elastic expansion plug respectively abut against the upper surface of the metal counterweight plate and the lower surface of the circular support plate.

4. The table tennis practice device according to claim 1, characterized in that: The adhesive layer covers the bottom wall of the groove, or the adhesive layer consists of at least two double-sided tapes symmetrically distributed on both sides of the center of the bottom wall of the groove.

5. The table tennis practice device according to claim 1, characterized in that: The sidewall of the groove is in contact with the sidewall of the metal counterweight plate.

6. The table tennis practice device according to claim 1, characterized in that: When the projection of the metal counterweight plate in the vertical direction is a regular polygon, the corners of the metal counterweight plate are provided with a first rounded chamfer.

7. The table tennis practice device base according to claim 6, characterized in that: The groove has a second rounded chamfer along its edge to facilitate the placement and removal of the metal counterweight plate.

8. The table tennis practice device according to claim 1, characterized in that: The plastic chassis also includes a skirt that is connected to the lower end of the enclosure and extends horizontally in all directions, the width of which is not less than 2mm.

9. The table tennis practice device according to claim 1, characterized in that: The diameter of the upper surface of the circular support plate is 170-180mm.

10. The table tennis practice device according to claim 9, characterized in that: The distance between the sidewall of the groove and the outer circumference of the circular support plate is 10-15mm.

11. The table tennis practice device according to claim 1, characterized in that: The groove has a depth of 2.5-3.5 mm, and the metal counterweight plate has a thickness of 2.0-3.0 mm.

12. The table tennis practice device according to claim 1, characterized in that: The plastic chassis is a PPC plastic chassis, and the metal counterweight plate is a stainless steel plate.

13. A method for manufacturing the table tennis practice device according to claim 1, characterized in that, Includes the following steps: S1. Insert the lower end of the elastic flexible shaft into the through hole in the center of the metal counterweight plate, so that the first annular flange on the lower end of the elastic flexible shaft abuts against the upper surface of the metal counterweight plate, and the lower end of the elastic flexible shaft protrudes from the lower surface of the metal counterweight plate to form a guide head; S2. Apply double-sided adhesive to the lower surface of the metal counterweight plate, avoiding the guide head formed in step S1 during the application process; S3. Insert the guide head formed in step S1 into the through hole in the center of the groove on the plastic base, so that a part of the guide head protrudes from the lower surface of the circular support plate of the plastic base, so that the metal counterweight plate is located above the groove on the plastic base, and then press the metal counterweight plate with double-sided adhesive into the groove on the plastic base, so that the metal counterweight plate is bonded to the groove of the plastic base to form the base; S4. The portion of the guide head protruding from the lower surface of the circular support plate is heat-melted to form the second annular flange that abuts against the lower surface of the circular support plate; S5. Connect the ping-pong ball to the upper end of the elastic flexible shaft to obtain the ping-pong ball training device.

14. A method for manufacturing the table tennis practice device according to claim 2, characterized in that, Includes the following steps: S1. Apply double-sided adhesive to the lower surface of the metal counterweight plate, avoiding the through hole in the center of the metal counterweight plate during application; S2. Press the metal counterweight plate with double-sided adhesive into the groove on the plastic base, so that the metal counterweight plate is bonded to the groove on the plastic base to form the base; S3. The elastic expansion plug with an I-shaped longitudinal section is fitted onto the lower end of the elastic flexible shaft, so that the upper surface of the upper end of the elastic expansion plug and the lower surface of the lower end of the elastic expansion plug respectively abut against the first annular flange and the second annular flange on the elastic flexible shaft; S4. The elastic expansion plug is squeezed into the through hole in the center of the metal counterweight plate and the through hole in the center of the groove, so that the lower surface of the upper end of the elastic expansion plug and the upper surface of the lower end of the elastic expansion plug respectively abut against the upper surface of the metal counterweight plate and the lower surface of the circular support plate. S5. Connect the ping-pong ball to the upper end of the elastic flexible shaft to obtain a ping-pong practice device.

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