Inflatable tennis liner forming machine

Abstract

The invention relates to an inflatable tennis ball liner forming machine. By accurately controlling the negative pressure and pressure in a cylinder, efficient adsorption and stable positioning of a hemispherical tennis ball liner are achieved, ensuring that the liner will not deviate or detach during the forming process. The inner mold is rotated under the cooperation of a piston and a nut, so that two hemispherical liner forms a tight and uniform rolled edge during the contact and extrusion process, thereby improving the sealing performance and overall structural strength of the liner. The interaction between a positioning ring and a reset spring and an annular reset spring is utilized to ensure that the two hemispherical tennis ball liner are accurately aligned and uniformly stressed during mold closing, thereby improving the forming accuracy of the liner. By further increasing the pressure in the cylinder, the connection part of the liner is fully compacted and fused, ensuring the shape stability of the liner after inflation. By adjusting the pressure in the cylinder, a tensile test is performed on the externally formed liner to ensure that the connection quality meets the standard.

Description

Technical Field

[0001] The invention relates to an inflatable tennis liner forming machine, in particular to an inflatable tennis liner forming machine applied to the technical field of sporting goods manufacturing. Background Art

[0002] Chinese invention patent CN117261190 proposes a soccer ball liner forming device and forming method thereof, which can automatically remove the formed sphere, significantly improves the safety and convenience of operation, and improves the cooling efficiency through the combined cooling method of air cooling and water cooling. However, in view of the miniaturization characteristics of the tennis ball liner and the special double hemisphere structure, the existing soccer ball liner forming device has not provided a targeted solution, especially in terms of the precise alignment of the hemisphere, the edge sealing and the efficient pressurization forming.

[0003] In addition, Chinese invention patent CN117583989 discloses an automatic grinding device for the inner liner mold line. The device significantly improves the grinding efficiency and the performance of the grinding wheel through automated loading, grinding and unloading. However, it does not fully support the adsorption positioning, rotational docking and integrated molding process during the tennis liner molding process. Moreover, the device is mainly aimed at the grinding stage and fails to cover the entire process flow of tennis liner molding.

[0004] Although the above designs have achieved good results in their respective application scenarios, there is still room for improvement and optimization in view of the special molding requirements of the inflatable tennis liner, especially how to achieve efficient adsorption and positioning of the hemisphere, rotate the rolling edge to eliminate the mold line marks, accurately control the mold pressure, and efficiently complete the overall molding process. Summary of the invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is to provide an inflatable tennis liner forming machine that can effectively solve the problems of precise adsorption and positioning of the hemisphere, rotary rolling sealing, uniform control of mold clamping pressure and low efficiency of integrated forming during the tennis liner forming process, so as to improve the production efficiency, product quality and safety of the production process of the tennis liner, reduce production costs, and meet the growing demand for high-quality tennis liner in the sporting goods market.

[0006] In order to solve the above problems, the present invention provides an inflatable tennis liner forming machine, including a tennis liner, wherein the outer end of the tennis liner is in contact with a symmetrically arranged inner mold, the ends of the symmetrically arranged inner molds that are away from each other are in contact with the outer molds that are also symmetrically arranged, the ends of the symmetrically arranged inner molds that are away from each other are fixedly connected with swivels, the ends of the symmetrically arranged swivels that are away from the inner mold are rotatably connected with swivel blocks, the ends of the symmetrically arranged swivel blocks that are away from the inner mold are fixedly connected with screws, the ends of the symmetrically arranged screws that are away from each other are fixedly connected with pistons, the ends of the symmetrically arranged pistons that are away from each other are slidably connected with cylinders, negative pressure holes are opened in the symmetrically arranged screws, the ends of the negative pressure holes that are away from each other are fixedly connected with one-way valve diaphragms, the ends of the symmetrically arranged cylinders that are close to each other are fixedly connected with nuts, the inner ends of multiple nuts are rotatably connected to the outer ends of the screws, the multiple cylinders are connected to external equipment, and the end of the screw close to the inner mold is fixedly connected with a decompression valve, and the decompression valve is connected to the negative pressure hole.

[0007] In the above-mentioned inflatable tennis liner forming machine, through negative pressure adsorption and precise air pressure control system, efficient and precise adsorption and positioning of the hemispherical tennis liner are achieved, avoiding the instability and possible risk of injury of manual operation. Secondly, the rotary rolling process not only ensures the tight fit and excellent sealing of the seams of the tennis liner, but also optimizes the traditional polishing process, improves production efficiency and the appearance quality of the tennis liner. In addition, through the precise mold positioning structure and intelligent pressurization system, the precise alignment and uniform force of the two hemispheres during docking are ensured, thereby improving the overall structural strength and air tightness of the molded tennis liner. Finally, the equipment also has a tensile detection function to ensure that each tennis liner meets strict quality standards before leaving the factory.

[0008] As a further improvement of the present application, the ends of the symmetrically arranged swivels away from the inner mold penetrate the outer mold and extend to the outside of the symmetrically arranged outer mold, and the extended parts are fixedly connected with end covers.

[0009] As a further improvement of the present application, a return spring is fixedly connected between the symmetrically arranged end cover and the outer mold, one end of the return spring abuts against an end of the end cover close to the inner mold, and the other end abuts against an end of the outer mold away from the inner mold.

[0010] As a further improvement of the present application, the ends of the symmetrically arranged inner molds that are close to each other are provided with positioning rings that are also symmetrically arranged. The symmetrically arranged positioning rings are composed of multiple sliders, and the multiple sliders are evenly distributed around the axis of the symmetrically arranged inner mold.

[0011] As another improvement of the present application, the outer end of the symmetrically arranged positioning ring is fixedly connected to the same annular return spring. After the installation is completed, the annular return spring is in a compressed state, and the ends of the symmetrically arranged inner molds that are close to each other and the ends of the symmetrically arranged positioning rings that are far away from each other are both one to two millimeters apart.

[0012] As another improvement supplement to the present application, the ends of the symmetrically arranged positioning rings that are away from each other are in contact with the ends of the inner mold and the outer mold that are close to each other, and the ends of the symmetrically arranged positioning rings that are away from each other are provided with bevels, and the ends of the symmetrically arranged outer molds that are close to each other are provided with bevels that match the bevels on the positioning rings.

[0013] As another improvement supplement to the present application, the outer ends of the symmetrically arranged cylinders are fixedly connected to the same base, and the part of the base located between the symmetrically arranged outer molds is fixedly connected to a positioning bracket that is also symmetrically arranged. The ends of the multiple sliders on the symmetrically arranged positioning rings that are away from each other all penetrate the positioning bracket and are slidably connected to the positioning bracket. Through holes are opened at positions corresponding to the negative pressure holes on the symmetrically arranged inner molds, rotating blocks and pistons, and the through holes are interconnected with the negative pressure holes. The symmetrically arranged one-way valve diaphragms and end covers are fixedly connected by bolts.

[0014] As another improvement of the present application, the following steps are included:

[0015] S1, hemispherical adsorption;

[0016] S2, rotary hemming;

[0017] S3, mold closing and positioning;

[0018] S4, press forming;

[0019] S5. Tensile test.

[0020] In summary, this application has the following beneficial effects:

[0021] 1. Efficient and accurate adsorption positioning. Through negative pressure adsorption technology, the cylinder is evacuated to generate negative pressure, so that the piston drives the inner mold to separate and adsorb the hemispherical tennis liner. The one-way valve diaphragm ensures that the adsorption process is stable and reliable, preventing the liner from detaching in subsequent operations, greatly improving the efficiency and accuracy of the liner loading and positioning.

[0022] 2. Rotary rolling technology enhances sealing. In the rotary rolling process, gas is injected through the cylinder during the mold closing process, so that the piston drives the inner mold to rotate. The two hemispherical tennis liner edges are tightly fitted and rolled during the rotating friction, which significantly enhances the sealing of the liner joints and improves product quality.

[0023] 3. Accurate mold closing and positioning, adopts a precise mold closing and positioning system. During the mold closing process, the outer mold interacts with the positioning ring. Through the cooperation of the reset spring and the ring-type reset spring, it ensures that the connecting end faces of the two hemisphere tennis liners are accurately aligned and evenly pressurized.

[0024] 4. Pressurized molding: Further pressurized molding uses cylinder pressure to fully compact and fuse the inner liner connection parts, thereby improving the structural strength and overall performance of the inner liner.

[0025] 5. Tensile testing ensures the quality of connection. By changing the pressure in the cylinder, the formed tennis liner is subjected to tensile testing to ensure that the strength and sealing of the connection parts of the tennis liner meet the standard requirements. After passing the test, the negative pressure is released through the decompression valve, and the completed tennis liner is removed safely and conveniently, which greatly improves the qualified rate of the finished product.

[0026] 6. High degree of automation and process stability. Through the precise air pressure control system, the automatic control of the steps such as liner adsorption, rotary rolling, mold positioning, pressurization molding and stretching detection is realized, which greatly reduces the manual intervention, improves the stability of the production process, and reduces the possibility of manual operation errors.

[0027] 7. Strong repeatability and long service life. The use of high-quality wear-resistant materials and precision processing technology ensures that all components maintain good working performance during long-term repeated use, effectively extending the service life of the equipment and reducing maintenance costs and downtime. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is the overall structure diagram of this application;

[0029] Figure 2 This is the front view of the application;

[0030] Figure 3 It is the AA cross-sectional view of this application;

[0031] Figure 4 This is an enlarged view of point B of this application;

[0032] Figure 5 This is an overall exploded view of this application;

[0033] Figure 6 Partial explosion for this application Figure 1 ;

[0034] Figure 7 Partial explosion for this application Figure 2 ;

[0035] Figure 8 Partial explosion for this application Figure 3 ;

[0036] Fig. 9 This is an enlarged view of point C of this application;

[0037] Fig.10 This is the appearance structure diagram of this application.

[0038] Description of the numbers in the figure:

[0039] 1. Tennis ball liner; 2. Inner mold; 3. Outer mold; 4. Swivel; 5. Swivel block; 6. Screw; 7. Piston; 8. Cylinder; 9. Negative pressure hole; 10. One-way valve diaphragm; 11. Nut; 12. End cover; 13. Reset spring; 14. Positioning ring; 15. Ring-shaped reset spring; 16. Base; 17. Positioning bracket. DETAILED DESCRIPTION

[0040] Three implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0041] The first implementation method:

[0042] Figure 1-10 The invention shows an inflatable tennis liner forming machine, comprising a tennis liner 1, wherein the outer end of the tennis liner 1 contacts with a symmetrically arranged inner mold 2, and the ends of the symmetrically arranged inner molds 2 that are away from each other are both in contact with an outer mold 3 that is also symmetrically arranged, and the ends of the symmetrically arranged inner molds 2 that are away from each other are both fixedly connected with a rotating ring 4, and the ends of the symmetrically arranged rotating ring 4 that are away from the inner mold 2 are both rotatably connected with a rotating block 5, and the ends of the symmetrically arranged rotating blocks 5 that are away from the inner mold 2 are both fixedly connected with a screw 6, and the ends of the symmetrically arranged screws 6 that are away from each other are They are all fixedly connected with pistons 7, and the ends of the symmetrically arranged pistons 7 that are away from each other are slidably connected with cylinders 8. Negative pressure holes 9 are opened in the symmetrically arranged screws 6, and the ends of the negative pressure holes 9 that are away from each other are fixedly connected with one-way valve diaphragms 10. The ends of the symmetrically arranged cylinders 8 that are close to each other are fixedly connected with nuts 11, and the inner ends of multiple nuts 11 are rotatably connected to the outer ends of the screws 6. Multiple cylinders 8 are connected to external equipment, and a decompression valve is fixedly connected to the end of the screw 6 close to the inner mold 2, and the decompression valve is communicated with the negative pressure hole 9.

[0043] In the above-mentioned inflatable tennis liner forming machine, through negative pressure adsorption and precise air pressure control system, efficient and precise adsorption and positioning of the hemispherical tennis liner 1 is achieved, avoiding the instability and possible risk of injury caused by manual operation. Secondly, the rotary rolling process not only ensures the tight fit and excellent sealing at the seams of the tennis liner 1, but also optimizes the traditional polishing process, improves production efficiency and the appearance quality of the tennis liner 1. In addition, through the precise mold positioning structure and intelligent pressurization system, the precise alignment and uniform force of the two hemispheres during docking are ensured, thereby improving the overall structural strength and air tightness of the molded tennis liner 1. Finally, the equipment also has a tensile detection function to ensure that each tennis liner 1 meets strict quality standards before leaving the factory.

[0044] The tennis ball liner 1 is a molding object and is a part of the final product. The two hemispherical liner to be molded are precisely bonded together through a series of operations in the device to form a complete inflatable tennis ball liner.

[0045] The symmetrically arranged inner mold 2 is used to carry and adsorb the hemispherical tennis liner 1 to be formed. Through adsorption and rotary rolling, etc., the precise alignment and good fit of the tennis liner 1 are ensured. During the forming process, the inner mold 2 provides a basic platform for shaping and fixing the shape of the tennis liner 1.

[0046] The outer mold 3, which is also symmetrically arranged, works together with the inner mold 2 during the mold closing process to provide external pressure to the tennis liner 1, ensuring that the two hemispherical tennis liner 1 can be in close contact during the mold closing to achieve a reliable connection. The cooperation between the outer mold 3 and the inner mold 2 can also help achieve positioning and hemming functions.

[0047] The swivel 4 is connected to the end of the inner mold 2, and drives the inner mold 2 to rotate by its own rotation, which helps to perform rotational friction rolling on the tennis liner 1 during the mold closing process, so that the edges of the two hemispheres fit together better.

[0048] The rotating block 5 is fixed to the end of the rotating ring 4 away from the inner mold. Its function is to transmit the rotational motion of the rotating ring to the screw 6, and the linear reciprocating motion of the piston 7 can be controlled by the screw 6 to combine with the rotational motion.

[0049] The screw 6 is connected with the piston 7 in the cylinder 8 to realize mechanical transmission and force transmission. The negative pressure hole 9 inside the screw 6 is connected to the decompression valve, which can control the application and release of negative pressure to achieve adsorption and separation of the tennis ball liner 1.

[0050] The piston 7 slides in the cylinder 8 and is driven by the gas pressure in the cylinder 8. On the one hand, it controls the distance between the inner mold 2 and the outer mold 3 to realize the mold opening and closing actions; on the other hand, through the linkage relationship with the screw 6, the inner mold 2 is allowed to rotate during the mold closing process.

[0051] The cylinder 8 is used as a driving device. By connecting with external equipment, it controls the inflow and outflow of internal gas, thereby driving the piston 7 to perform reciprocating motion. At the same time, it also realizes a series of actions such as adsorption of the tennis liner 1, mold closing and pressurization, and detection and stretching through the adjustment of air pressure.

[0052] The negative pressure hole 9 is arranged in the screw 6 and connected to the one-way valve diaphragm 10, and is used to generate negative pressure when the cylinder 8 is evacuated, so that the inner mold 2 can effectively absorb the tennis ball liner 1.

[0053] The one-way valve diaphragm 10 is installed at one end of the negative pressure hole 9, allowing gas to flow in one direction only, ensuring that the tennis liner 1 can be firmly adsorbed during the suction stage and will not fall off during the deflation stage, ensuring the stability and controllability of the adsorption and release process.

[0054] The nut 11 is connected between the cylinder 8 and the screw 6 to achieve a rotational connection between the two, ensuring that the piston 7 can rotate with the screw 6 while moving linearly, ensuring that the inner mold 2 can perform rotational rolling during the mold closing process.

[0055] The second implementation method:

[0056] Figure 1-10 As shown, the ends of the symmetrically arranged swivels 4 away from the inner mold 2 penetrate the outer mold 3 and extend to the outside of the symmetrically arranged outer mold 3, and the extended parts are fixedly connected with the end caps 12.

[0057] A return spring 13 is fixedly connected between the symmetrically arranged end cover 12 and the outer mold 3 , one end of the return spring 13 abuts against the end of the end cover 12 close to the inner mold 2 , and the other end abuts against the end of the outer mold 3 away from the inner mold 2 .

[0058] The symmetrically arranged inner molds 2 are provided with symmetrically arranged positioning rings 14 at one end close to each other. The symmetrically arranged positioning rings 14 are composed of a plurality of sliders, and the plurality of sliders are evenly distributed around the axis of the symmetrically arranged inner mold 2 .

[0059] The outer end of the symmetrically arranged positioning ring 14 is fixedly connected to the same annular return spring 15. After installation, the annular return spring 15 is in a compressed state. The ends of the symmetrically arranged inner molds 2 that are close to each other and the ends of the symmetrically arranged positioning rings 14 that are far away from each other are both one to two millimeters apart.

[0060] The ends of the symmetrically arranged positioning rings 14 that are away from each other are in contact with the ends of the inner mold 2 and the outer mold 3 that are close to each other, and the ends of the symmetrically arranged positioning rings 14 that are away from each other are provided with bevels, and the ends of the symmetrically arranged outer molds 3 that are close to each other are provided with bevels that match the bevels on the positioning rings 14.

[0061] The outer ends of the symmetrically arranged cylinders 8 are fixedly connected to the same base 16, and the base 16 located between the symmetrically arranged outer molds 3 is fixedly connected to the positioning bracket 17 which is also symmetrically arranged. The ends of the multiple sliders on the symmetrically arranged positioning rings 14 that are away from each other all penetrate the positioning bracket 17 and are slidably connected to the positioning bracket 17. Through holes are opened at positions corresponding to the negative pressure holes 9 on the symmetrically arranged inner molds 2, rotating blocks 5 and pistons 7, and the through holes are interconnected with the negative pressure holes 9. The symmetrically arranged one-way valve diaphragms 10 and end covers 12 are fixedly connected by bolts.

[0062] The swivel 4 passes through the outer mold 3 and extends outward, and is fixedly connected to the end cover 12, so that the swivel can drive the inner mold 2 to rotate without affecting the fixing and clamping process of the outer mold 3. The rotational movement of the swivel 4 is transmitted to the outside of the outer mold 3 through the end cover 12, making the overall structure more compact and stable.

[0063] The end cover 12 is connected to the swivel 4, and plays a connecting and supporting role. Through the return spring 13 between the end cover 12 and the outer mold 3, after the inner mold 2 is separated from the outer mold 3, the inner mold 2 can be quickly returned to its original position with the help of the restoring force of the return spring 13, which is beneficial to improving production efficiency and the degree of automation of the equipment.

[0064] The two ends of the return spring 13 are respectively against the end cover 12 and the outer mold 3. When the inner mold 2 is separated after mold closing, the return spring 13 provides a driving force to make the inner mold 2 quickly return to the initial position, ensuring the continuous operation of the equipment and the smoothness of operation.

[0065] The positioning ring 14 is composed of a plurality of sliders, which are evenly distributed around the axis of the inner mold 2. Its function is to accurately guide the alignment of the two hemispherical tennis liners 1 during the mold closing process. The bevel on the positioning ring 14 cooperates with the bevel on the outer mold 3 to ensure smooth contact and rolling of the tennis liners 1 during mold closing, thereby improving the sealing and consistency of the joints and improving the alignment of the two hemispherical tennis liners 1.

[0066] The annular return spring 15 pushes the positioning ring 14 to return to its original position after the external force is removed, thereby maintaining the stability of the equipment and ensuring that the positioning ring 14 is in close contact with the inner mold 2 and the outer mold 3, thereby ensuring the accuracy of each mold closing.

[0067] The base 16 serves as a supporting structure for the cylinder 8 and other components, enhancing the rigidity and stability of the overall device. At the same time, the positioning bracket 17 fixedly connected to the base 16 is used to guide the slider on the positioning ring 14 to ensure the linearity and accuracy of the slider during movement.

[0068] The positioning bracket 17 cooperates with the slider of the positioning ring 14 to limit the movement trajectory of the slider and ensure that the slider can slide smoothly when subjected to force, thereby ensuring the position accuracy of the tennis liner 1 during the mold closing process.

[0069] Through holes communicating with the negative pressure hole 9 are provided on the inner mold 2, the rotating block 5 and the piston 7 to ensure that the negative pressure can act evenly on the tennis liner 1, thereby realizing reliable adsorption and fixation of the tennis liner 1. At the same time, the one-way valve diaphragm 10 and the end cover 12 are fixedly connected by bolts to ensure the sealing and stability of the negative pressure system.

[0070] The third implementation method:

[0071] Figure 1-10 Shown, comprising the following steps;

[0072] S1, hemispherical adsorption;

[0073] The gas in the symmetrically arranged cylinder 8 is extracted through external equipment. At this time, the symmetrically arranged piston 7 drives the inner mold 2 and the outer mold 3 to move away from each other under the action of negative pressure. Then, the tennis liners 1 of the two hemispheres are respectively placed on the ends of the symmetrically arranged inner mold 2 that are close to each other. Then, under the action of negative pressure, the tennis liners 1 of the two hemispheres are adsorbed onto the symmetrically arranged inner mold 2 until the tennis liners 1 of the two hemispheres are firmly adsorbed by the symmetrically arranged inner mold 2, and then the air extraction is stopped. At this time, under the action of the one-way valve diaphragm 10, the external equipment stops exhausting, and the tennis liners 1 of the two hemispheres are fixed on the inner mold 2.

[0074] S2, rotary hemming;

[0075] The symmetrically arranged cylinder 8 is pressurized by an external device, and the symmetrically arranged piston 7 drives the inner mold 2 and the outer mold 3 to move toward each other under the action of the gas pressure. During the movement of the piston 7, due to the interaction between the piston 7 and the nut 11, the piston 7 rotates while moving, and the rotation of the piston 7 drives the inner mold 2 connected thereto to follow the rotation, and the inner mold 2 then drives the tennis inner liners 1 of the two hemispheres to rotate at the same time, and the two inner molds 2 rotate in opposite directions. When the tennis inner liners 1 of the two hemispheres approach each other, under the rotation of the inner mold 2, the tennis inner liners 1 of the two hemispheres rotate and rub against each other to complete the rotary rolling.

[0076] S3, mold closing and positioning;

[0077] In the process of approaching each other, the two outer molds 3 contact the ends of the symmetrically arranged positioning rings 14 that are away from each other. Under the action of the bevel, the outer mold 3 pushes the multiple sliders on the positioning rings 14 to move in the direction of approaching each other. In this process, the sliders on the multiple positioning rings 14 contact the outer end of the tennis liner 1 and push the two ends of the tennis liner 1 of the two hemispheres that are close to each other to align with each other until the two outer molds 3 are butted against each other. At this time, the multiple sliders on the multiple positioning rings 14 press the ends of the tennis liner 1 of the two hemispheres that are close to each other to align. At this time, the tennis liner 1 of the two hemispheres is in contact with each other, and the symmetrically arranged return spring 13 is compressed, and the annular return spring 15 is compressed by the symmetrically arranged positioning rings 14 at the same time.

[0078] S4, press forming;

[0079] The cylinder 8 is continuously pressurized by external equipment, and the inner mold 2 continues to move toward each other under the pressure. At this time, the tennis liner 1 of the two hemispheres is further pressurized so that they can be better connected together.

[0080] S5. Tensile test.

[0081] After the connection is completed, the gas in the cylinder 8 is extracted through external equipment. At this time, under the action of negative pressure, the tennis ball liner 1 is stretched away from each other by the two inner molds 2. The pulling force of the two inner molds 2 is maintained at a certain level through external equipment as needed, and the connection molding effect of the tennis ball liner 1 is tested. After the test is qualified, gas is introduced into the negative pressure hole 9 through the decompression valve on the screw 6 to release the adsorption of the two inner molds 2 on the tennis ball liner 1. The tennis ball liner 1 can be removed to complete the molding process of the tennis ball liner 1.

[0082] Hemispherical adsorption generates negative pressure by exhausting air from the symmetrically arranged cylinder 8, and transmits the negative pressure to the piston 7 through the negative pressure hole 9. Under the action of the negative pressure, the piston 7 moves toward the outside of the cylinder 8, thereby driving the inner mold 2 and the outer mold 3 to expand outward synchronously. At this time, the operator places the two hemispherical tennis liner 1 on the symmetrical inner mold 2 respectively. With the continuous action of the negative pressure, the one-way valve diaphragm 10 only allows the gas to flow in one direction, ensuring that the tennis liner 1 is firmly adsorbed on the inner mold 2 until the tennis liner 1 is firmly adsorbed and the predetermined adsorption force is reached, and the external equipment stops exhausting air.

[0083] During the rotating hemming, the external equipment starts to inject high-pressure gas into the cylinder 8. The piston 7 starts to move toward the direction of the inner mold 2 under the action of the gas pressure, and realizes the rotational motion under the guidance of the nut 11. This rotational motion will be transmitted to the inner mold 2 through the rotating block 5, so that the inner mold 2 rotates synchronously with the hemispherical tennis liner 1 adsorbed thereon. The two inner molds 2 rotate in opposite directions, so that the edges of the two tennis liner 1 are better aligned and rolled during the process of approaching each other and rotating friction, thereby enhancing the sealing and structural strength of the interface of the tennis liner 1.

[0084] Mold closing and positioning, when the two outer molds 3 gradually approach each other under the push of high-pressure gas, the bevel on the positioning ring 14 meets and interacts with the bevel of the outer mold 3, which prompts the multiple sliders on the positioning ring 14 to move inward along the positioning bracket 17. After the slider contacts the outer end of the tennis liner 1, it accurately guides and pushes the connecting end surfaces of the two hemispherical tennis liner 1 to align. In this process, the return spring 13 and the annular return spring 15 are both compressed, providing balanced pressure and precise positioning for the tennis liner 1 when the mold is closed, ensuring that the interfaces of the two tennis liner 1 are tightly fitted and consistent in shape.

[0085] Pressurized molding: In order to further strengthen the connection strength of the tennis liner 1, high-pressure gas is continuously injected into the cylinder 8, so that the piston 7 drives the inner mold 2 to move further toward the center point of the inner mold 2, thereby increasing the contact pressure between the two hemispherical tennis liner 1. Under the action of higher pressure, the connection part of the tennis liner 1 is fully compacted and fused, ensuring that the tennis liner 1 can maintain its original shape and strength after inflation.

[0086] Tensile test: after the tennis liner 1 is formed, the external equipment starts the vacuum program, and through the negative pressure in the cylinder 8, the piston 7 drives the inner mold 2 to move outward, so as to perform a tensile test on the formed tennis liner 1. Under a certain tensile force, observe whether the tennis liner 1 has abnormal conditions such as tearing and leakage, so as to verify the connection reliability of the tennis liner 1. If the tensile test result shows that the quality of the tennis liner 1 is qualified, gas is filled into the negative pressure hole 9 through the pressure relief valve to release the adsorption force of the one-way valve diaphragm 10 on the liner, and then the formed tennis liner 1 is smoothly removed from the inner mold 2, completing the entire molding process of the tennis liner 1.

[0087] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. An inflatable tennis ball liner forming machine, comprising a tennis ball liner (1), characterized in that: The outer end of the tennis ball liner (1) is in contact with an inner mold (2) that is symmetrically arranged; the ends of the inner molds (2) that are symmetrically arranged and are away from each other are in contact with an outer mold (3) that is also symmetrically arranged; the ends of the inner molds (2) that are symmetrically arranged and are away from each other are fixedly connected to a rotating ring (4); the ends of the symmetrically arranged rotating ring (4) that are away from the inner mold (2) are rotatably connected to a rotating block (5); the ends of the symmetrically arranged rotating blocks (5) that are away from the inner mold (2) are fixedly connected to a screw rod (6); the ends of the symmetrically arranged screw rods (6) that are away from each other are fixedly connected to a piston (7); The ends of the pistons (7) that are arranged away from each other are slidably connected to cylinders (8), the symmetrically arranged screw rods (6) are provided with negative pressure holes (9), the ends of the negative pressure holes (9) that are arranged away from each other are fixedly connected to one-way valve diaphragms (10), the ends of the symmetrically arranged cylinders (8) that are arranged close to each other are fixedly connected to nuts (11), the inner ends of the multiple nuts (11) are rotatably connected to the outer ends of the screw rods (6), the multiple cylinders (8) are connected to external equipment, and the end of the screw rods (6) close to the inner mold (2) is fixedly connected to a decompression valve, and the decompression valve is connected to the negative pressure hole (9); The ends of the symmetrically arranged rotating rings (4) away from the inner mold (2) penetrate the outer mold (3) and extend to the outside of the symmetrically arranged outer mold (3), and the extended parts are fixedly connected to the end covers (12); Through holes are provided at positions corresponding to the negative pressure holes (9) on the symmetrically arranged inner mold (2), rotating block (5) and piston (7), and the through holes are interconnected with the negative pressure holes (9). The symmetrically arranged one-way valve diaphragm (10) and end cover (12) are fixedly connected by bolts.

2. The inflatable tennis liner forming machine according to claim 1, characterized in that: A return spring (13) is fixedly connected between the symmetrically arranged end cover (12) and the outer mold (3); one end of the return spring (13) abuts against an end of the end cover (12) close to the inner mold (2), and the other end abuts against an end of the outer mold (3) away from the inner mold (2).

3. The inflatable tennis liner forming machine according to claim 1, characterized in that: The symmetrically arranged inner molds (2) are provided with symmetrically arranged positioning rings (14) at their ends close to each other. The symmetrically arranged positioning rings (14) are each composed of a plurality of sliders, and the plurality of sliders are evenly distributed around the axis of the symmetrically arranged inner mold (2).

4. The inflatable tennis liner forming machine according to claim 3, characterized in that: The outer ends of the symmetrically arranged positioning rings (14) are fixedly connected to the same annular return spring (15). After installation, the annular return spring (15) is in a compressed state. The ends of the symmetrically arranged inner molds (2) that are close to each other and the ends of the symmetrically arranged positioning rings (14) that are far away from each other are both one to two millimeters apart.

5. The inflatable tennis liner forming machine according to claim 3, characterized in that: The ends of the symmetrically arranged positioning rings (14) that are away from each other are both arranged in contact with the ends of the inner mold (2) and the outer mold (3) that are close to each other, and the ends of the symmetrically arranged positioning rings (14) that are away from each other are both provided with bevels, and the ends of the symmetrically arranged outer molds (3) that are close to each other are both provided with bevels that match the bevels on the positioning rings (14).

6. The inflatable tennis ball liner forming machine according to claim 3, characterized in that: The outer ends of the symmetrically arranged cylinders (8) are fixedly connected to the same base (16), and the part of the base (16) located between the symmetrically arranged outer molds (3) is fixedly connected to a positioning bracket (17) that is also symmetrically arranged, and the ends of the multiple sliders on the symmetrically arranged positioning rings (14) that are away from each other all penetrate the positioning bracket (17) and are slidably connected to the positioning bracket (17).

7. An inflatable tennis liner forming machine according to any one of claims 1 to 6, characterized in that: The steps include: S1, hemispherical adsorption; S2, rotary hemming; S3, mold closing and positioning; S4, press forming; S5. Tensile test.

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