Exhaust device and tire mold

Abstract

The utility model discloses an exhaust device and tire mould, it belongs to tire mould technical field, and the exhaust device is used for tire mould, and the cavity surface of tire mould is equipped with exhaust hole, exhaust device includes sleeve core, and sleeve core includes exhaust part and discharging glue part, the outer periphery of exhaust part is equipped with a plurality of axial extension's recess, and recess penetrates exhaust part, and recess is spaced apart and is arranged on the outer periphery of exhaust part, and the connecting convex is formed between two adjacent recesses, discharging glue part is fixed on the second end surface of exhaust part away from the cavity, and the outer diameter of discharging glue part is less than the outer diameter of exhaust part, when using, the connecting convex is with the interference fit of exhaust hole, and the recess inside forms the front exhaust passage, and the outside of discharging glue part forms the rear exhaust passage, and the front exhaust passage is communicated with the rear exhaust passage, and the flow cross section of front exhaust passage is less than the flow cross section of rear exhaust passage, can avoid the exhaust hole of tire mould and block, and the rubber material that enters the exhaust device can break, and discharge, realizes the self -cleaning effect.

Description

Technical Field

[0001] This utility model relates to the field of tire mold technology, specifically to an exhaust device and a tire mold. Background Technology

[0002] Currently, venting devices used in tire molds are mainly divided into two types: ordinary vent sleeves and spring vent sleeves. Ordinary vent sleeves refer to small vent holes distributed on the tire mold. Tires vulcanized using ordinary vent sleeves will produce rubber fibers, requiring a rubber fiber removal step in subsequent processes, which is time-consuming, labor-intensive, and costly. Spring vent sleeves overcome the problem of rubber fibers produced by ordinary vent sleeves, but their structure is complex, mainly consisting of a sleeve shell, a core inside the sleeve shell, and a spring between the sleeve shell and the core. This not only results in high manufacturing costs but also requires a high level of skill from the installers. After prolonged use, rubber material can enter the venting channel between the sleeve shell and the core, bonding the spring and causing the spring vent sleeve to fail. Once the spring vent sleeve fails, it needs to be replaced, increasing the operating cost. Summary of the Invention

[0003] To address the problems existing in the prior art, this utility model provides an exhaust device and a tire mold. The tire mold using this exhaust device will not produce rubber hairs on the tire after vulcanization. The exhaust device has a self-cleaning effect, and the exhaust holes of the tire mold are not easily blocked.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] On the one hand, this utility model provides an exhaust device for a tire mold, wherein the cavity surface of the tire mold is provided with an exhaust hole; the exhaust device includes a core, wherein the core includes an exhaust part and a rubber discharge part;

[0006] The outer peripheral surface of the exhaust section is provided with a plurality of axially extending grooves, the grooves passing through the exhaust section, the grooves being spaced apart on the outer peripheral surface of the exhaust section, and a connecting protrusion being formed between two adjacent grooves;

[0007] The glue discharge section is fixed to the second end face of the venting section away from the cavity surface, and the outer diameter of the glue discharge section is smaller than the outer diameter of the venting section;

[0008] When the exhaust device is in use, the connecting protrusion is interference-fitted with the exhaust hole, a front exhaust channel is formed inside the groove, a rear exhaust channel is formed outside the rubber discharge part, the front exhaust channel is connected to the rear exhaust channel, and the flow cross section of the front exhaust channel is smaller than the flow cross section of the rear exhaust channel.

[0009] In one of the above-mentioned exhaust devices, the depth of the groove is 0.02~0.1mm;

[0010] And / or, the axial length of the exhaust section is 0.03~1mm;

[0011] And / or, the groove gradually deepens as its distance from the cavity surface increases.

[0012] In one of the above-mentioned exhaust devices, the exhaust section is a cylinder;

[0013] And / or, the adhesive discharge section is a cylinder;

[0014] And / or, the outer diameter of the discharge section gradually decreases in the direction away from the exhaust section;

[0015] And / or, the first end face of the exhaust portion adjacent to the cavity surface is flush with the cavity surface.

[0016] In one of the above-mentioned exhaust devices, the interference fit between the connecting protrusion and the exhaust hole is 0.01~0.1mm.

[0017] In one of the above-mentioned venting devices, a plurality of auxiliary support portions are provided on the outer side wall of the glue discharge portion. The auxiliary support portions protrude outward from the outer side wall of the glue discharge portion and are used to assist the core sleeve in being fixedly connected to the venting hole.

[0018] In one of the above-mentioned exhaust devices, the auxiliary support portions are distributed at intervals in the circumferential direction of the adhesive discharge portion;

[0019] And / or, the number of auxiliary support parts is less than 6;

[0020] And / or, the auxiliary support is inclined at one end face toward the exhaust portion to guide the adhesive material away from the exhaust portion;

[0021] And / or, the auxiliary support portion is inclined away from the fourth end face of the exhaust portion, and its end near the exhaust portion is radially outward.

[0022] In one of the above-mentioned exhaust devices, a housing is also included, the housing having an inner hole that axially penetrates the housing;

[0023] The sleeve is located inside the inner hole;

[0024] When the exhaust device is in use, the housing is interference-fitted with the exhaust hole; the connecting protrusion is interference-fitted with the inner hole; the front exhaust channel is located between the inner wall of the groove and the inner wall of the inner hole; and the rear exhaust channel is located between the outer side of the glue discharge part and the hole wall of the inner hole.

[0025] In one of the above-mentioned exhaust devices, the end face of the sleeve adjacent to the cavity surface is flush with the cavity surface;

[0026] And / or, the end face of the core adjacent to the cavity surface is flush with the end face of the shell adjacent to the cavity surface.

[0027] In one of the above-mentioned exhaust devices, the housing includes a connecting part and a guiding part. The outer diameter of the connecting part is larger than the outer diameter of the guiding part. The connecting part is adjacent to the cavity surface and is interference-fitted with the exhaust hole. The guiding part is clearance-fitted with the exhaust hole.

[0028] On the other hand, this utility model provides a tire mold, including the above-mentioned exhaust device.

[0029] The beneficial effects of this utility model are as follows:

[0030] 1. The venting device is equipped with venting sections and glue-discharging sections with different outer diameters. The outer diameter of the glue-discharging section is smaller than that of the venting section, which can form a rear venting channel with a larger cross-section between the venting hole and the glue-discharging section. The venting section divides the large flow cross-section of the venting hole into multiple front venting channels with relatively smaller flow cross-sections. Due to the small flow cross-section of the front venting channel, the effect of venting without discharging glue can be achieved. At the same time, by reasonably setting the axial length of the venting section and the depth of the groove, the rubber material entering the venting hole can be broken at the connection between the front venting channel and the cavity, that is, broken at the cavity surface, so as not to form rubber hairs on the tire. The broken rubber material will be pushed into the rear venting channel by airflow and other materials during subsequent use. The rear venting channel has a larger flow cross-section, which can accommodate the rubber material and avoid blockage of the front venting channel. The venting device has a self-cleaning function.

[0031] 2. The groove of the core can be flexibly changed to different shapes. The self-cleaning function of the venting device can be achieved by controlling the height of the venting part and the depth of the groove. The groove depth is 0.02~0.1mm, and the axial length of the venting part is 0.03~1mm. That is, the cross-sectional length of the rubber material in the front venting channel is 0.03~1mm, and the width is 0.02~0.1mm. The cross-section of the rubber material is relatively small, and the strength is low, which is conducive to the breakage of the rubber material at the cavity surface.

[0032] 3. The exhaust and glue discharge parts are designed as cylinders, which facilitates processing and production, and also makes it easy to assemble into the exhaust and vent holes. The assembly accuracy is easy to control and the assembly precision is high.

[0033] 4. The auxiliary support part further improves the installation accuracy and stability of the core sleeve. Some surfaces of the auxiliary support part have chamfers to avoid the accumulation of adhesive at the chamfers.

[0034] 5. The outer diameter of the discharge section gradually decreases in the direction away from the exhaust section, providing more space for the discharge of the adhesive.

[0035] 6. The sleeve is located between the vent hole and the core. If the core needs to be disassembled for cleaning or replacement, the vent hole will not be damaged. Attached Figure Description

[0036] Figure 1 A schematic diagram of the structure of a first embodiment of the exhaust device;

[0037] Figure 2 for Figure 1 Sectional view of section AA;

[0038] Figure 3 for Figure 1 Sectional view of section BB;

[0039] Figure 4 for Figure 1 A bottom view;

[0040] Figure 5 This is a schematic diagram of the assembly structure of the first embodiment of the exhaust device and the exhaust port;

[0041] Figure 6 This is a magnified view of a portion of the core.

[0042] Figure 7 This is a cross-sectional view of the assembled structure of the sleeve and the vent hole;

[0043] Figure 8 This is a schematic diagram of a second embodiment of the exhaust device;

[0044] Figure 9 This is a cross-sectional view of a second embodiment of the exhaust device;

[0045] Figure 10 This is a schematic diagram of the assembly structure of the second embodiment of the exhaust device and the exhaust port.

[0046] In the picture:

[0047] 100 - Core; 110 - Venting section; 111 - Groove; 112 - Connecting protrusion; 120 - Glue discharge section; 130 - Auxiliary support section; 131 - Third end face; 132 - Guide surface; 133 - Fourth end face;

[0048] 200 - Housing; 210 - Inner hole; 220 - Connecting part; 230 - Guide part;

[0049] 300 - Tire mold; 310 - Vent hole;

[0050] 400 - Front exhaust passage; 500 - Rear exhaust passage. Detailed Implementation

[0051] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0052] Please refer to Figure 1-10 The exhibition not only showcased a self-cleaning venting device but also a tire mold 300 using this device. During tire vulcanization, the venting device is used to expel gas between the tire and the cavity surface of the tire mold 300. Specifically, the cavity surface of the tire mold 300 has several vent holes 310, and the venting device is installed and fixed within these vent holes 310. This allows for the rapid and effective expulsion of gas between the tire and the cavity surface, preventing air pockets that could lead to tire defects. Furthermore, it effectively avoids vulcanizing machine downtime caused by rubber blockage.

[0053] Please refer to Figures 1-7 This is a first embodiment of the exhaust device; the exhaust device includes a sleeve 100, the sleeve 100 includes an exhaust part 110 and a glue discharge part 120; the exhaust part 110 and the glue discharge part 120 are fixed as one piece, which can be processed as one piece, or they can be assembled as one piece as needed.

[0054] The venting section 110 matches the venting hole 310. Typically, the venting hole 310 has a circular cross-section, while the venting section 110 is cylindrical. Axially, the end of the venting section 110 adjacent to the cavity surface is called the first end, and its end face is called the first end face. The other end is called the second end, and its end face is called the second end face. The first end face of the venting section 110 is flush with the cavity surface, and the glue discharge section 120 is fixedly connected to the second end face.

[0055] The outer peripheral surface of the exhaust section 110 is provided with a plurality of axially extending grooves 111, which penetrate the exhaust section 110 and are open on both the first end face and the second end face. The plurality of grooves 111 are spaced apart on the outer peripheral surface of the exhaust section 110, and the outer peripheral surface of the exhaust section 110 has concave and convex parts. The concave parts are the grooves 111, and the convex parts are referred to below as connecting protrusions 112. The connecting protrusions 112 and the grooves 111 are arranged alternately.

[0056] In use, the venting device employs an interference fit between the connecting protrusion 112 and the vent hole 310, which primarily serves to fix the sleeve 100 within the vent hole 310. The interference fit between the connecting protrusion 112 and the vent hole 310 is preferably 0.01~0.1mm. Figure 5 As shown, the inner wall of the groove 111 and the partial inner wall of the vent 310 form a front venting channel 400, maintaining the connection between the cavity of the tire mold 300 and the vent 310; the venting part 110 divides the larger flow section of the vent 310 at its corresponding position into several front venting channels 400 with smaller flow sections, ensuring that the gas passes smoothly while the flow of the glue is restricted.

[0057] The cross-sectional shape of the groove 111 can be any shape, such as rectangular or sector.

[0058] By rationally designing the axial length of the venting section 110 and the depth of the groove 111, the rubber compound can be encouraged to break during tire demolding, and the broken rubber compound remains within the front venting channel 400, having no impact on the tire vulcanization quality. Preferably, the depth of the groove 111 is 0.02~0.1mm, and the axial length of the venting section 110 is 0.03~1mm. The depth of the groove 111 and the axial length of the venting section 110 respectively correspond to and define the cross-sectional dimensions of the rubber compound within the front venting channel 400. A small cross-sectional dimension results in low strength and easy breakage of the rubber compound.

[0059] The depth of the groove 111 can be uniform; or, as the distance from the first end face increases, the depth of the groove 111 gradually increases, which can make the flow cross-section of the front exhaust channel 400 increase with the increase of the distance from the first end face. That is to say, the flow cross-section of the front exhaust channel 400 near the cavity surface is small, and the flow cross-section far from the cavity surface is large. Overall, the front exhaust channel 400 is narrower at the connection with the cavity surface. The cross-section of the rubber material at this position is smaller and the strength is lower, which is conducive to the rubber material breaking at the cavity surface during the tire demolding process. This not only avoids the generation of rubber hair on the tire, but also allows the broken rubber material to leave the front exhaust channel 400 with the assistance of fluid. The fluid includes the gas between the tire and the cavity surface, the rubber material melted in the vulcanization process, etc., which promotes the broken rubber material to move downstream in the airflow direction, thereby avoiding the rubber material from blocking the front exhaust channel 400.

[0060] like Figure 5 and Figure 7 As shown, a rear exhaust channel 500 is formed between the outer side of the rubber discharge section 120 and the wall of the exhaust hole 310. In the airflow direction, the rear exhaust channel 500 is connected upstream to the front exhaust channel 400 and downstream to other exhaust channels on the tire mold 300, ultimately achieving gas discharge from the tire mold 300. The outer diameter of the rubber discharge section 120 is smaller than the outer diameter of the exhaust section 110, therefore the flow cross-section of the rear exhaust channel 500 is larger than that of the front exhaust channel 400. The rear exhaust channel 500 temporarily stores the rubber material from the front exhaust channel 400, working with the exhaust section 110 to achieve a self-cleaning effect of the exhaust device. When the tire mold 300 is used for a long time and the rubber material in the rear exhaust channel 500 affects the exhaust, the tire mold 300 is then cleaned. The use of the exhaust device reduces the maintenance cost and workload of the tire mold 300.

[0061] Furthermore, the outer diameter of the discharge section 120 gradually decreases in the direction away from the exhaust section 110, and correspondingly, the area of ​​the flow cross section of the rear exhaust channel 500 gradually increases, providing sufficient flow space for the rubber material to be discharged from the front exhaust channel 400.

[0062] The outer wall of the glue discharge section 120 is provided with several auxiliary support sections 130. The auxiliary support sections 130 are distributed at intervals in the circumferential direction of the glue discharge section 120. The auxiliary support sections 130 protrude outward from the outer wall of the glue discharge section 120 and are interference-fitted with the vent hole 310. The auxiliary sleeve 100 is fixed in the vent hole 310. The area between two adjacent auxiliary support sections 130 arranged alternately is used for venting and glue discharge, avoiding partial blockage of the rear vent channel 500 and affecting the flow of glue.

[0063] The number of auxiliary support parts 130 can be set according to needs. For example, the number of auxiliary support parts 130 is less than 6, preferably 4. The 4 auxiliary support parts 130 are evenly distributed in the circumferential direction of the glue discharge part 120. On the basis that the auxiliary exhaust parts 110 jointly play a role in fixing the sleeve core 100, it is also necessary to ensure that the rear exhaust channel 500 has a sufficient flow cross section.

[0064] Furthermore, the auxiliary support portion 130 is inclined at one end face toward the vent portion 110 to guide the adhesive material away from the vent portion 110; it includes a third end face 131 and a guide surface 132; wherein, the end of the third end face 131 away from the vent portion 110 extends away from the adhesive discharge portion 120, that is, it is radially inclined outward, which can prevent the adhesive material from accumulating on the third end face 131 of the auxiliary support portion 130. The third end face 131 is connected to the guide surface 132 on both sides around the circumference, and the end of the guide surface 132 near the vent portion 110 is inclined inward toward the auxiliary support portion 130, further guiding the adhesive material to move and be extruded away from the vent portion 110.

[0065] The fourth end face 133 of the auxiliary support 130, which is away from the exhaust section 110, can also be set to be inclined, with the end near the exhaust section 110 inclined outward in the radial direction.

[0066] The third end face 131, the guide face 132 and the fourth end face 133 all have chamfers at their respective edges, which helps to improve the strength of the auxiliary support part 130 and can also guide the assembly of the sleeve core 100 and the vent hole 310.

[0067] Please refer to Figures 8-10 In a second embodiment of the exhaust device, the sleeve 100 is used in conjunction with the housing 200, that is, the exhaust device includes the sleeve 100 and the housing 200. The housing 200 has an inner hole 210 that axially penetrates the housing 200; the sleeve 100 is embedded in the inner hole 210.

[0068] The housing 200 includes a connecting portion 220 and a guiding portion 230. The housing 200 directly mates with the vent hole 310. The outer diameter of the connecting portion 220 is larger than the outer diameter of the guiding portion 230. The connecting portion 220 and the vent hole 310 are interference-fitted, while the guiding portion 230 and the vent hole 310 are clearance-fitted. Unlike the first embodiment, in this venting device, the housing 200 and the vent hole 310 are interference-fitted and sealed; the connecting protrusion 112 is interference-fitted with the inner hole 210; the front venting channel 400 is located between the inner wall of the groove 111 and the inner wall of the inner hole 210; and the rear venting channel 500 is located between the outer side of the glue discharge portion 120 and the hole wall of the inner hole 210.

[0069] Preferably, the end face of the connecting portion 220 is flush with the cavity surface. Furthermore, the first end face of the core 100 is also flush with the end face of the housing 200 adjacent to the cavity surface.

[0070] Setting a sleeve 200 between the sleeve 100 and the vent hole 310 can not only protect the vent hole 310 during tire mold cleaning or sleeve 100 disassembly and assembly, and prevent damage to the vent hole 310, but also increase the application range of the sleeve 100. For vent holes with different inner diameters, the sleeve 200 can be replaced accordingly, so that the sleeve 100 can be applied to the existing tire mold 300.

[0071] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A venting device for a tire mold (300), wherein the tire mold (300) has venting holes (310) on its cavity surface; characterized in that, The venting device includes a sleeve (100), which includes a venting part (110) and a glue discharge part (120). The exhaust section (110) has a plurality of axially extending grooves (111) on its outer peripheral surface. The grooves (111) penetrate the exhaust section (110). The grooves (111) are spaced apart on the outer peripheral surface of the exhaust section (110), and a connecting protrusion (112) is formed between two adjacent grooves (111). The glue discharge section (120) is fixed on the second end face of the venting section (110) away from the cavity surface, and the outer diameter of the glue discharge section (120) is smaller than the outer diameter of the venting section (110); When the exhaust device is in use, the connecting protrusion (112) is press-fitted with the exhaust hole (310), a front exhaust channel (400) is formed inside the groove (111), and a rear exhaust channel (500) is formed outside the glue discharge part (120). The front exhaust channel (400) and the rear exhaust channel (500) are connected, and the flow cross section of the front exhaust channel (400) is smaller than the flow cross section of the rear exhaust channel (500).

2. The exhaust device according to claim 1, characterized in that, The depth of the groove (111) is 0.02~0.1mm; And / or, the axial length of the exhaust section (110) is 0.03~1mm; And / or, the groove (111) gradually deepens as its distance from the cavity surface increases.

3. The exhaust device according to claim 1, characterized in that, The exhaust section (110) is a cylinder; And / or, the glue discharge section (120) is a cylinder; And / or, the outer diameter of the discharge portion (120) gradually decreases in the direction away from the exhaust portion (110); And / or, the first end face of the exhaust portion (110) adjacent to the cavity surface is flush with the cavity surface.

4. The exhaust device according to claim 1, characterized in that, The interference fit between the connecting protrusion (112) and the vent hole (310) is 0.01~0.1mm.

5. An exhaust device according to claim 1, characterized in that, The outer wall of the glue discharge section (120) is provided with a plurality of auxiliary support sections (130), which protrude outward from the outer wall of the glue discharge section (120) to assist the core (100) in being fixedly connected to the vent hole (310).

6. An exhaust device according to claim 5, characterized in that, The auxiliary support parts (130) are distributed at intervals in the circumferential direction of the glue discharge part (120); And / or, the number of auxiliary support parts (130) is less than 6; And / or, the auxiliary support (130) is inclined at one end face toward the exhaust (110) to guide the adhesive material away from the exhaust (110); And / or, the auxiliary support (130) is inclined away from the fourth end face (133) of the exhaust portion (110), and its end near the exhaust portion (110) is radially outward.

7. An exhaust device according to claim 1, characterized in that, It also includes a housing (200), the housing (200) having an inner hole (210) that axially penetrates the housing (200). The sleeve (100) is located inside the inner hole (210); When the exhaust device is in use, the housing (200) is press-fitted with the exhaust hole (310); the connecting protrusion (112) is press-fitted with the inner hole (210); the front exhaust channel (400) is located between the inner wall of the groove (111) and the inner wall of the inner hole (210); and the rear exhaust channel (500) is located between the outer side of the glue discharge part (120) and the hole wall of the inner hole (210).

8. An exhaust device according to claim 7, characterized in that, The end face of the sleeve (200) adjacent to the cavity surface is flush with the cavity surface; And / or, the end face of the core (100) near the cavity surface is flush with the end face of the shell (200) near the cavity surface.

9. An exhaust device according to claim 7, characterized in that, The housing (200) includes a connecting part (220) and a guiding part (230). The outer diameter of the connecting part (220) is larger than the outer diameter of the guiding part (230). The connecting part (220) is adjacent to the cavity surface and is interference-fitted with the vent hole (310). The guiding part (230) is clearance-fitted with the vent hole (310).

10. A tire mold, characterized in that, Includes the exhaust device as described in any one of claims 1-9.

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