Film puncturing needle, film puncturing device and three-roller calender

Abstract

The utility model provides a film puncturing needle, a film puncturing device and a three-roller calender, and solves the technical problem that puncturing and exhausting are not thorough in the existing tire cord fabric hot pasting process. Each film puncturing needle is provided with a puncturing section, each puncturing section is of a polygonal pyramid structure, the film puncturing device is provided with a puncturing roller, the film puncturing needles are uniformly distributed and mounted on the puncturing roller, and the three-roller calender comprises the film puncturing device; the device can be widely applied to the field of tire production equipment.

Description

Technical Field

[0001] This application relates to the field of tire production equipment, and in particular to a rubber sheet puncture needle, a rubber sheet puncture device, and a three-roll calender. Background Technology

[0002] In tire manufacturing, the thermal bonding process is a crucial step, typically using a three-roll calender to bond thin rubber sheets with tire cord fabric (such as nylon, polyester, or steel cord). However, air bubbles are a common defect in this process, affecting tire quality and performance.

[0003] Currently, the on-site method used is puncture and venting, which involves using a puncturing roller during the calendering process to puncture the thin film adhered to the cord fabric and expel residual air. Utility model disclosure CN217123386U discloses a tire fiber cord fabric puncture needle and puncture needle device, including a head for puncturing the fiber cord fabric. The head includes an interconnected puncture section and a limiting section. The puncture section is located at the end of the needle, and its diameter is smaller than that of the limiting section. A stepped surface is formed at the connection between the puncture section and the limiting section; the tip of the puncture section is conical. This utility model's needle adopts a two-section structure. Puncture is performed through the puncture section, and the limiting section limits the puncture depth, thereby controlling the puncture depth and solving the problem of the needle tip penetrating too deeply into the thin film during cord fabric perforation, thus damaging the cord fibers.

[0004] The aforementioned utility model's puncture section includes a conical needle tip 4211 and a cylindrical puncture body 4212. The conical needle tip 4211 facilitates puncturing the fiber fabric, while the cylindrical puncture body 4212 helps maintain the shape of the hole (see [link]). Figure 1 However, because the fabric with the thin rubber sheet attached is not vulcanized, the unvulcanized rubber molecular chains do not form a cross-linked structure, and the molecular chains can move relatively freely. Therefore, the rubber exhibits softness and plasticity. When the above-mentioned utility model is used to complete the piercing action of the thin rubber sheet attached to the fabric, the wound is small when the needle tip 4211 pierces. Even if a cylindrical piercing body 4212 is set, the round hole on the thin rubber sheet will shrink when the piercing section is pulled out. Since the shape of the hole is circular, its edge shrinks at the same speed, and even the phenomenon of the round hole closing occurs. This results in the incomplete expulsion of residual air in the air bubble, which in turn affects the quality and performance of the tire. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the above-mentioned technology and provide a film puncturing needle, a film puncturing device, and a three-roll calender to completely remove residual air from the air bubbles between the fabric and the thin film.

[0006] Therefore, this utility model provides a film piercing needle, which has a head and a piercing section, the piercing section being a multi-faceted frustum structure.

[0007] Preferably, the edge of the cone-shaped puncture section is provided with a chamfered bevel.

[0008] Preferably, the angle α between the side edge of the puncture segment and the center line of the puncture segment is 30±5°; the angle β between the chamfered bevel and the center line of the puncture segment is 60±5°.

[0009] Preferably, the film piercing needle also has a tail, on which there is an external thread, and the tail is connected to the bottom surface of the piercing section.

[0010] Preferably, the puncture segment has a frustum-shaped structure.

[0011] A film punching device includes a punching roller, on which film punching needles as described in any of the above claims are evenly distributed.

[0012] Preferably, the film punching device is further provided with a pair of pushing devices, which are respectively rolledly connected to both ends of the punching roller; the pushing device is provided with a linear drive device and an orientation device, the orientation device is provided with a slider and a slide rail connected to the slider through a slider bearing, the telescopic rod of the linear drive device is connected to the slider through a spherical bearing, and the slider is rolledly connected to the roller shaft located at the end of the punching roller through a punching roller bearing.

[0013] Preferably, the linear drive device is a cylinder.

[0014] A three-roll calender, comprising a film punching device as described in any of the preceding claims.

[0015] The beneficial effects of this utility model are as follows: This utility model provides a film piercing needle, a film piercing device, and a three-roll calender. The head of the film piercing needle is provided with a piercing section with a multi-faceted pyramidal structure. During the piercing action of the thin film attached to the cord fabric, the pyramidal surface of the piercing section first pierces the thin film, resulting in a larger wound. During the piercing process, the side of the multi-faceted pyramidal structure of the piercing section gradually cuts and continuously expands the wound, thereby piercing the air bubble between the cord fabric and the thin film. After the piercing section is pulled out, although the pierced hole will shrink due to the softness and plasticity of the uncured thin film, since the hole is not a round hole but a polygonal hole, the edge of the hole shrinks at different speeds during shrinkage, and a complete closure will not occur. This allows the residual air in the air bubble to be completely discharged, ensuring the quality and performance of the tire. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a needle in the prior art;

[0018] Figure 2 This is a schematic diagram of the structure of the film piercing needle of this utility model;

[0019] Figure 3 for Figure 2 A schematic diagram of the top view of the view shown;

[0020] Figure 4 This is a schematic diagram of the film perforation device;

[0021] Figure 5 for Figure 4 A schematic diagram of the structure of the enlarged left view of the perforating roller shown;

[0022] Figure 6 This is a schematic diagram illustrating the working principle of a film perforation device.

[0023] The markings in the diagram are: 1. Head, 2. Tail, 3. Puncture roller, 4. Pushing device, 5. Slider bearing, 6. Spherical bearing, 7. Puncture roller bearing, 8. Middle roller, 9. Frame, 10. Puncture section, 20. External thread, 30. Film puncture needle, 31. Roller shaft, 40. Linear drive device, 41. Orientation device, 101. Chamfered bevel, 411. Slider, 412. Slide rail, 4211. Needle tip, 4212. Puncture body;

[0024] α is the angle between the lateral edge of the puncture segment and the centerline;

[0025] β is the angle between the chamfered slope and the centerline. Detailed Implementation

[0026] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit the scope of this application. Unless otherwise specified, the methods used in this utility model are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0027] Depend on Figure 2 , Figure 3 , Figure 5 As shown, this utility model provides a film piercing needle 30, which has a head 1 and a piercing section 10, which is a frustum-shaped pyramid structure.

[0028] Compared to existing technologies, the present invention features a puncture section 10 with a frustum-shaped pyramid structure. During the puncture process on the thin film adhered to the tire cord, the frustum-shaped surface of the puncture section 10 first punctures the thin film, resulting in a larger wound. As the puncture progresses, the sides of the frustum-shaped pyramid of the puncture section 10 gradually cut and expand the wound, thereby puncturing the air bubble between the tire cord and the thin film. After the puncture section 10 is withdrawn, although the puncture hole will shrink due to the softness and plasticity of the uncured thin film, since the hole is not round but polygonal, the edges of the hole shrink at different speeds, preventing complete closure. This ensures that the residual air inside the air bubble is completely expelled, guaranteeing the tire's quality and performance.

[0029] It should be noted that the puncture segment 10 can also be a triangular frustum, pentagonal frustum, hexagonal frustum, or other multi-faceted frustum structures.

[0030] Based on production practice, by Figure 2 As shown, in some embodiments, the angle α between the side edge of the puncture segment 10 and the center line of the puncture segment 10 is preferably 30±5°, which improves the puncture and air release effect.

[0031] In some embodiments, by Figure 2 As shown, the edge of the cone-shaped puncture section 10 is provided with a chamfered bevel 101, which serves as a buffer. Preferably, the angle β between the chamfered bevel 101 and the centerline of the puncture section 10 is 60±5°, resulting in better puncture and air release effects.

[0032] In some embodiments, by Figure 2 As shown, the film piercing needle 30 also has a tail 2, on which an external thread 20 is provided, and the tail 2 is connected to the bottom surface of the piercing section 10. Through the threaded connection, the head 1 can be detachably mounted on the working surface of the piercing roller 3.

[0033] Depend on Figure 4 , Figure 5 As shown, this utility model also provides a film piercing device, which includes a piercing roller 3, on which a film piercing needle 30 as described in any of the above claims is evenly distributed.

[0034] In some embodiments, preferably, by Figure 4As shown, the film perforation device also includes a pair of pushing devices 4, which are respectively rolledly connected to both ends of the perforation roller 3. The pushing device 4 includes a linear drive device 40 and an orientation device 41. The orientation device 41 includes a slider 411 and a slide rail 412 connected to the slider 411 via a slider bearing 5. The telescopic rod of the linear drive device 40 is connected to the slider 411 via a spherical bearing 6. The slider 411 is rolledly connected to the roller shaft 31 located at the end of the perforation roller 3 via a perforation roller bearing 7. The orientation device 41 is provided to make the perforation roller 3 more stable and reliable under the extension or retraction of the telescopic rod of the linear drive device 40.

[0035] The linear drive device 40 is preferably a cylinder, but other existing linear drive devices such as electric cylinders can also be used instead of the cylinder.

[0036] Depend on Figure 6 As shown (the upper and lower rollers of the three-roll calender are not shown), this utility model also provides a three-roll calender, which includes a film piercing device as described in any of the above claims. Before use, a pair of pushing devices 4 of the film piercing device described in this utility model are respectively installed on the frame 9, so that the piercing roller 3 and the middle roller 8 are arranged parallel and spaced apart. During the calendering process, under the power output of the linear drive device 40 (extension of the telescopic rod), the pushing device 4 pushes the piercing roller 3, so that the piercing roller 3 approaches the middle roller 8 in parallel, completing the piercing roller 3 to pierce the thin film attached to the curtain and expel residual air. After the calendering work is completed, under the power output of the linear drive device 40 (retraction of the telescopic rod), the pushing device 4 drives the piercing roller 3, so that the piercing roller 3 moves away from the middle roller 8 in parallel, preparing in advance for the next calendering piercing and air venting.

[0037] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", 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 utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A film puncturing needle provided with a head (1) provided with a piercing section (10), characterized in that, The puncture section (10) is a multi-prism frustum structure.

2. A film puncturing needle according to claim 1, wherein The frustum edge of the puncture section (10) is provided with a chamfered slope (101).

3. A film puncturing needle according to claim 2, wherein The included angle α between the side edge of the puncture section (10) and the center line of the puncture section (10) is 30±5°; and the included angle β between the chamfered slope (101) and the center line of the puncture section (10) is 60±5°.

4. The film puncturing needle of claim 2, wherein The film puncture needle (30) is further provided with a tail portion (2), the tail portion (2) is provided with an external thread (20), and the tail portion (2) is connected with the bottom surface of the puncture section (10).

5. A film puncturing needle according to any one of claims 1 to 4, wherein The puncture section (10) is a four-prism frustum structure.

6. A film perforating device provided with a perforating roller (3), characterized in that The puncture roller (3) is uniformly provided with the film puncture needle according to any one of claims 1-5.

7. A film perforator according to claim 6, wherein The film puncture device is further provided with a pair of pushing devices (4), the pair of pushing devices (4) are respectively connected with the two ends of the puncture roller (3) in a rolling manner; the pushing device (4) is provided with a linear driving device (40) and a directional device (41), the directional device (41) is provided with a sliding block (411) and a slide rail (412) connected with the sliding block (411) through a sliding block bearing (5), the telescopic rod of the linear driving device (40) is connected with the sliding block (411) through a joint bearing (6), and the sliding block (411) is connected with the roller shaft (31) at the end of the puncture roller (3) in a rolling manner through a puncture roller bearing (7).

8. A film perforator according to claim 7, wherein The linear driving device (40) is a pneumatic cylinder.

9. A three-roll calender characterized by, The film puncture device comprises the film puncture device according to any one of claims 6-8.

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