Spring air hole sleeve and tire mold
By designing multiple bending and connecting channels and clearance fits in the spring vent sleeve, the problem of spring failure caused by rubber entering the vent channel is solved, achieving unobstructed venting and extended service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HIMILE MECHANICAL SCI & TECH (SHANDONG) CO LTD
- Filing Date
- 2025-06-24
- Publication Date
- 2026-06-26
AI Technical Summary
Existing spring vent sleeves are prone to failure after prolonged use due to adhesive entering the venting channel and sticking to the spring, which increases the cost of use.
A spring-loaded vent sleeve was designed. The sleeve core includes a core cap, a core rod, and a core tail. During the axial movement of the sleeve core within the bushing, the axial extension is always located within the annular groove, forming a near-S-shaped connecting channel with multiple bends. Combined with clearance fit, this reduces the probability of rubber entering the venting channel.
This effectively prevents adhesive from entering the venting channel and sticking to the spring, extending the service life of the spring vent sleeve and reducing replacement frequency and usage costs.
Smart Images
Figure CN224408540U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of exhaust devices for tire molds, specifically relating to a spring air hole sleeve and a tire mold. Background Technology
[0002] During tire vulcanization, the gas between the tread blocks, side plates, and rim and the tire blank needs to be expelled during the mold closing process. Currently, the venting devices used on tire molds are mainly divided into two types: ordinary vent sleeves and spring vent sleeves.
[0003] A standard venting sleeve refers to small vents distributed on a tire mold. Tires vulcanized using a standard venting sleeve require the removal of rubber fibers, which is time-consuming and labor-intensive. A spring venting sleeve consists of a bushing, a core inside the bushing, and a spring between the bushing and the core. Under the action of the spring and external force, the core can move axially relative to the bushing. During the tire vulcanization process, the spring venting sleeve can expel gas with the mold and close the pores to prevent rubber leakage. Therefore, it avoids the defect of needing to remove rubber fibers later, which is caused by using a standard venting sleeve.
[0004] However, after prolonged use as a venting device for tire molds, the spring vent sleeve may experience problems. During the mold closing process, as the sleeve core compresses the spring in the direction away from the cavity, some adhesive material may enter the venting channel between the bushing and the sleeve core along the incompletely closed venting holes. This adhesive material can cause the spring vent sleeve to fail. Once the spring vent sleeve fails, it needs to be replaced, increasing the cost of use. Utility Model Content
[0005] To address the problem that existing spring vent sleeves are prone to spring failure due to adhesive material entering the exhaust channel after prolonged use, this utility model provides a spring vent sleeve.
[0006] A spring vent sleeve includes a bushing, a core disposed within the bushing, and a spring disposed in an exhaust channel between the bushing and the core. The core includes a core cap, a core rod, and a core tail that are coaxially fixedly arranged in sequence, with the core tail extending out of the bushing.
[0007] The core cap includes a body, one axial end of which is coaxially fixedly connected to the core rod, and the other axial end of the body is coaxially fixedly provided with a radial extension portion, the radial outer edge of which is bent and extended toward the core rod to form an axial extension portion.
[0008] The axial extension is adapted to the annular groove, and an air passage is formed between the axial extension and the annular groove, which can connect to the exhaust channel. The radial cross-section of the air passage is U-shaped.
[0009] During the axial movement of the sleeve core within the bushing, the axial extension portion remains within the annular groove and moves along the annular groove.
[0010] Preferably, the radial outer wall surface of the axial extension is clearance-fitted with the radial outer wall surface of the annular groove;
[0011] The clearance width between the radial outer wall surface of the axial extension and the radial outer wall surface of the annular groove is in the range of 0.02mm to 0.05mm.
[0012] Preferably, an inner conical surface is provided on the side of the inner wall of the bushing away from the core tail, and a gap is always maintained between the outer wall of the main body and the inner conical surface during the axial movement of the core within the bushing.
[0013] Preferably, a plurality of protrusions are evenly provided along the circumferential direction on the end face of the radial extension facing the bushing, and when the protrusions on the radial extension are pressed against the axial end face of the bushing, a gap is left between the outer wall surface of the main body and the inner conical surface.
[0014] Preferably, the bushing has an annular groove at one end facing the radial extension.
[0015] Preferably, the inner wall surface of the bushing is uniformly provided with a plurality of air holes that extend radially into the annular groove along the circumferential direction.
[0016] This utility model also provides a tire mold.
[0017] A tire mold includes a mold body, wherein a spring air hole sleeve is provided on the mold body;
[0018] The mold body is provided with mounting holes, the bushing is fixedly installed in the mounting holes, and the core cap is installed facing the mold cavity of the mold body.
[0019] This utility model also provides a tire mold.
[0020] A tire mold includes a mold body, wherein a spring air hole sleeve is provided on the mold body;
[0021] The mold body is provided with mounting holes, the bushing is fixedly installed in the mounting holes, and the core cap is installed facing the mold cavity of the mold body;
[0022] The mold body has an annular groove on the side facing the mold cavity.
[0023] Preferably, the annular groove is located radially outside the mounting hole and is not connected to the mounting hole.
[0024] Preferably, the end of the mounting hole facing the mold cavity expands radially outward to form an annular groove;
[0025] An annular positioning part is formed on the outer wall surface of the bushing near the radial extension. The annular end face of the annular positioning part facing away from the radial extension cooperates with the annular groove and the annular step between the mounting hole to achieve axial positioning of the bushing in the mounting hole.
[0026] The beneficial effects of this utility model are:
[0027] (1) In the spring vent sleeve of this utility model, during the process of the sleeve core moving axially in the bushing, the axial extension is always located in the annular groove. The air passage between the axial extension and the annular groove, and the gap between the radial extension and the axial end face of the bushing form a connecting channel between the mold cavity and the exhaust channel. This connecting channel forms a near-S-shaped structure with multiple bends. This bend structure can ensure unobstructed exhaust. However, based on the physical properties of the rubber, it is very difficult for it to enter the exhaust channel where the spring is located through the bend connecting channel, thereby reducing the probability of the rubber entering the exhaust channel and sticking to the spring.
[0028] (2) In the spring vent sleeve of this utility model, the radial outer wall surface of the axial extension is fitted with the radial outer wall surface of the ring groove, so that the flow gap of the connecting channel near the inner cavity of the mold is smaller, further reducing the probability of the rubber material entering the exhaust channel.
[0029] (3) In this utility model, when the spring in the spring vent cap is damaged and cannot open the core cap, the protrusion setting makes the radial extension part and the diameter of the bushing axial end face still have a gap, thereby ensuring that the air passage between the mold cavity, the axial extension part and the ring groove, the gap between the radial extension part and the bushing axial end face, and the exhaust passage are connected to achieve smooth exhaust. Attached Figure Description
[0030] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.
[0031] Figure 1 This is a schematic diagram of the spring vent sleeve in Embodiment 1 of this utility model;
[0032] Figure 2 This is a schematic diagram of the state of the spring vent sleeve in Embodiment 1 of this utility model when no adhesive is injected into the mold cavity;
[0033] Figure 3 This is a schematic diagram of the state of the spring vent sleeve in Embodiment 1 of this utility model when the cavity is filled with adhesive.
[0034] Figure 4 This is a schematic diagram of the spring vent sleeve in Embodiment 2 of this utility model;
[0035] Figure 5 This is a schematic diagram of the structure of the protrusion on the radial extension in Embodiment 3 of this utility model;
[0036] Figure 6 This is a schematic diagram of the spring vent sleeve in Embodiment 4 of this utility model;
[0037] Figure 7 This is a schematic diagram of the spring vent sleeve in Embodiment 5 of this utility model;
[0038] Figure 8 This is a schematic diagram of the spring vent sleeve in Embodiment 7 of this utility model;
[0039] Figure 9 This is a schematic diagram of the spring vent sleeve in Embodiment 8 of this utility model;
[0040] Figure 10 This is a schematic diagram of the spring vent sleeve in Embodiment 9 of this utility model;
[0041] in:
[0042] 1. Bushing; 11. Inner conical surface; 12. Air hole; 13. Annular positioning part; 2. Core sleeve; 21. Core cap; 211. Body; 212. Radial extension; 213. Axial extension; 214. Air groove; 215. Protrusion; 22. Core rod; 23. Core tail; 3. Spring; 4. Exhaust channel; 5. Annular groove; 6. Mold body. Detailed Implementation
[0043] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0044] Example 1:
[0045] like Figure 1 As shown, a spring vent sleeve includes a bushing 1, a core 2 disposed within the bushing 1, and a spring 3 disposed within an exhaust channel 4 between the bushing 1 and the core 2. The core 2 includes a core cap 21, a core rod 22, and a core tail 23 coaxially fixedly arranged in sequence. The core tail 23 extends out of the bushing 1 and cannot enter the exhaust channel 4 to prevent the core 2 from detaching upwards. The core rod 22 includes a first cylindrical portion and a second cylindrical portion coaxially arranged. The diameter of the first cylindrical portion is larger than the diameter of the second cylindrical portion. The first cylindrical portion and the second cylindrical portion are coaxially fixedly connected by a frustum portion. The first cylindrical portion is connected to the small end of the body 221, and the second cylindrical portion is connected to the core tail 23. An annular step is provided on the lower part of the inner wall of the bushing 1 as a spring seat connected to the bottom end of the spring 3.
[0046] The core cap 21 includes a body 211, one axial end of which is coaxially fixedly connected to the core rod 22, and the other axial end of the body 211 is coaxially fixedly provided with a radial extension 212. The radial outer edge of the radial extension 212 is bent and extended towards the core rod 22 to form an axial extension 213. The included angle between the radial extension 212 and the axial extension 213 is α, where 90°≤α<180°. Specifically, the outer wall surface of the body 211 has a frustum structure, and the small end of the body 211 is coaxially fixedly connected to the core rod 22.
[0047] The axial extension 213 is adapted to be connected to the annular groove 5, and an air passage that can be connected to the exhaust passage 4 is formed between the axial extension 213 and the annular groove 5. The radial cross section of the air passage has a U-shaped structure.
[0048] During the axial movement of the sleeve core 2 within the bushing 1, the axial extension 213 is always located within the annular groove 5 and moves along the annular groove 5.
[0049] Preferably, the radial outer wall surface of the axial extension 213 and the radial outer wall surface of the annular groove 5 are clearance-fitted;
[0050] The clearance width between the radial outer wall of the axial extension 213 and the radial outer wall of the annular groove 5 is in the range of 0.02mm to 0.05mm.
[0051] On the one hand, during the axial movement of the core 2 within the bushing 1, the axial extension 213 remains within the annular groove 5. The air passage between the axial extension 213 and the annular groove 5, and the gap between the radial extension 212 and the axial end face of the bushing 1, form a connecting channel between the mold cavity and the venting channel 4. This connecting channel forms a near-S-shaped structure with multiple bends. This bend structure ensures unobstructed venting. However, due to the physical properties of the rubber material, it is very difficult for it to enter the venting channel 4 where the spring 3 is located through the bend connecting channel, thus reducing the probability of the rubber material entering the venting channel 4 and sticking to the spring 3. On the other hand, the radial outer wall of the axial extension 213 and the radial outer wall of the annular groove 5 are fitted with a clearance, thereby making the flow gap of the connecting channel near the mold cavity smaller, further reducing the probability of the rubber material entering the venting channel 4.
[0052] Preferably, an inner conical surface 11 is provided on the side of the inner wall of the bushing 1 away from the core tail 23, and a gap is always maintained between the outer wall of the body 211 and the inner conical surface 11 during the axial movement of the core 2 inside the bushing 1.
[0053] When the spring vent sleeve in Example 1 is used, initially, under the action of the spring 3, the radial extension 212 of the core cap 21 moves away from the axial end face of the bushing 1, thereby connecting the mold cavity, the air passage between the axial extension 213 and the annular groove 5, the gap between the radial extension 212 and the axial end face of the bushing 1, and the exhaust passage 4. The state of the spring vent sleeve when no adhesive is injected into the mold cavity is as follows: Figure 2 As shown; during the process of injecting the rubber into the mold cavity, the gas in the mold cavity enters the exhaust channel 4 through the air passage between the axial extension 213 and the annular groove 5, and the gap between the radial extension 212 and the axial end face of the bushing 1, and is discharged outward. At the same time, the rubber applies pressure to the core cap 21, causing the core cap 21 to overcome the elastic force of the spring 3 and move away from the mold cavity until the rubber fills the cavity. At this time, the radial extension 212 is pressed against the axial end face of the bushing 1, so that the rubber cannot overflow. The state of the spring vent sleeve when the mold cavity is filled with rubber is as follows. Figure 3 As shown. During the process of injecting the rubber into the mold cavity, the axial extension 213 is always located within the annular groove 5 and moves along the annular groove 5, so that the gas can be discharged along the near-S-shaped connecting channel with multiple bends between the mold cavity and the venting channel 4. Based on the physical properties of the rubber, the multiple bends of the connecting channel, and the multiple fits with small flow gaps between the radial outer wall of the axial extension 213 and the radial outer wall of the annular groove 5, the probability of the rubber entering the venting channel 4 and sticking to the spring, causing the spring 3 to fail, is effectively reduced. In particular, the rubber can almost not enter the venting channel 4 where the spring 3 is located.
[0054] Example 2:
[0055] Based on Example 1, such as Figure 4 As shown, a plurality of air grooves 214 are uniformly arranged along the circumferential direction on the radial outer wall surface of the axial extension 213.
[0056] In order to prevent the rubber material from easily entering the gap between the outer wall of the axial extension 213 and the annular groove 5, the gap between the outer wall of the axial extension 213 and the annular groove 5 is very small, and can be as small as 0.02mm. The air groove 214 can relieve the air pressure during exhaust.
[0057] Example 3:
[0058] Based on Example 1 or Example 2, such as Figure 5 As shown, several protrusions 215 are evenly arranged along the circumferential direction on the end face of the radial extension 212 facing the bushing 1, so that a gap is always left between the radial extension 212 and the bushing 1 during the axial movement of the core 2 inside the bushing 1.
[0059] In Example 3, when the spring 3 in the spring vent cap is damaged and fails to open the core cap 21, the protrusion 215 ensures that there is still a gap between the radial extension 212 and the axial end face diameter of the bushing 1. This ensures that the air passage between the mold cavity, the axial extension 213 and the annular groove 5, the gap between the radial extension 212 and the axial end face of the bushing 1, and the exhaust passage 4 are connected, so as to achieve smooth exhaust.
[0060] Meanwhile, even if the presence of the protrusion 215 causes the air passage between the mold cavity, the axial extension 213 and the annular groove 5, the gap between the radial extension 212 and the axial end face of the bushing 1, and the exhaust channel 4 to be connected, the U-shaped bend of the air passage between the axial extension 213 and the annular groove 5 and the small flow gap between the radial outer wall of the axial extension 213 and the radial outer wall of the annular groove 5 can effectively prevent the rubber material from entering the exhaust channel 4 and sticking to the spring 3 during the tire vulcanization process.
[0061] Example 4:
[0062] Based on Example 1, Example 2, or Example 3, such as Figure 6 As shown, the bushing 1 has an annular groove 5 at one end facing the radial extension 212.
[0063] Example 5:
[0064] Based on Example 4, such as Figure 7 As shown, a plurality of air holes 12 are uniformly arranged along the circumferential direction on the inner wall surface of the bushing 1, which extend radially to the annular groove 5.
[0065] When the spring vent sleeve in Example 5 is used, gas can enter the annular groove 5 through the gap between the radial outer wall of the axial extension 213 and the radial outer wall of the annular groove 5 in the inner cavity of the mold, and then directly enter the exhaust channel 4 through the vent 12 for discharge.
[0066] Example 6:
[0067] A tire mold includes a mold body 6, on which a spring air hole sleeve as described in Embodiment 1, Embodiment 2, Embodiment 3, Embodiment 4, or Embodiment 5 is provided;
[0068] The mold body 6 is provided with mounting holes, the bushing 1 is fixedly installed in the mounting holes, and the core cap 21 is installed facing the mold cavity of the mold body 6.
[0069] Example 7:
[0070] A tire mold includes a mold body 6, on which a spring air hole sleeve as described in Embodiment 1, Embodiment 2, or Embodiment 3 is provided;
[0071] The mold body 6 is provided with mounting holes, the bushing 1 is fixedly installed in the mounting holes, and the core cap 21 is installed facing the mold cavity of the mold body 6.
[0072] The mold body 6 has an annular groove 5 on the side facing the mold cavity.
[0073] Preferred, such as Figure 8 As shown, the annular groove 5 is located radially outside the mounting hole and is not connected to the mounting hole.
[0074] Example 8:
[0075] Unlike in Example 7, as Figure 9 As shown, the end of the mounting hole facing the mold cavity expands radially outward to form an annular groove 5.
[0076] Example 9:
[0077] Based on Example 8, such as Figure 10 As shown, an annular positioning part 13 is formed on the outer wall surface of the bushing 1 near the radial extension 212. The annular end face of the annular positioning part 13 facing away from the radial extension 212 is engaged with the annular step between the annular groove 5 and the mounting hole to achieve axial positioning of the bushing 1 in the mounting hole. When there is no axial positioning, the bushing 1 and the mounting hole can be interference-fitted.
[0078] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, they are not intended to limit the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the protection scope of the present utility model.
Claims
1. A spring vent sleeve, comprising a bushing (1), a core (2) disposed within the bushing (1), and a spring (3) disposed within an exhaust channel (4) between the bushing (1) and the core (2), wherein the core (2) comprises a core cap (21), a core rod (22), and a core tail (23) coaxially and fixedly disposed in sequence, and the core tail (23) extends out of the bushing (1); characterized in that, The core cap (21) includes a body (211), one axial end of the body (211) is coaxially fixedly connected to the core rod (22), and the other axial end of the body (211) is coaxially fixedly provided with a radial extension (212) in the radial direction outward. The radial outer edge of the radial extension (212) is bent and extended towards the core rod (22) to form an axial extension (213). The axial extension (213) is adapted to be connected to the annular groove (5), and an air passage that can be connected to the exhaust passage (4) is formed between the axial extension (213) and the annular groove (5). The radial cross section of the air passage is U-shaped. During the axial movement of the sleeve core (2) within the bushing (1), the axial extension (213) is always located within the annular groove (5) and moves along the annular groove (5).
2. The spring vent sleeve as described in claim 1, characterized in that, The radial outer wall surface of the axial extension (213) is clearance-fitted with the radial outer wall surface of the annular groove (5); The clearance width between the radial outer wall of the axial extension (213) and the radial outer wall of the annular groove (5) is in the range of 0.02mm to 0.05mm.
3. The spring vent sleeve as described in claim 1, characterized in that, An inner conical surface (11) is provided on the side of the inner wall of the bushing (1) away from the core tail (23). During the axial movement of the core (2) inside the bushing (1), a gap is always left between the outer wall of the body (211) and the inner conical surface (11).
4. The spring vent sleeve as described in claim 3, characterized in that, The radial extension (212) has several protrusions (215) evenly arranged in the circumferential direction on the end face of the bushing (1).
5. The spring vent sleeve as described in claim 1, characterized in that, The bushing (1) has an annular groove (5) at one end facing the radial extension (212).
6. The spring vent sleeve as described in claim 5, characterized in that, The inner wall of the bushing (1) is uniformly provided with a number of air holes (12) that extend radially to the annular groove (5).
7. A tire mold, comprising a mold body (6), characterized in that, The mold body (6) is provided with a spring air hole sleeve as described in any one of claims 1 to 6; The mold body (6) is provided with mounting holes, the bushing (1) is fixedly installed in the mounting holes, and the core cap (21) is installed facing the mold cavity of the mold body (6).
8. A tire mold, comprising a mold body (6), characterized in that, The mold body (6) is provided with a spring air hole sleeve as described in any one of claims 1 to 4; The mold body (6) is provided with mounting holes, the bushing (1) is fixedly installed in the mounting holes, and the core cap (21) is installed facing the mold cavity of the mold body (6); The mold body (6) has an annular groove (5) on the side facing the mold cavity.
9. The tire mold as described in claim 8, characterized in that, The annular groove (5) is located radially outside the mounting hole and is not connected to the mounting hole.
10. The tire mold as described in claim 8, characterized in that, The mounting hole facing the mold cavity expands radially outward to form an annular groove (5); The bushing (1) extends radially to form an annular positioning part (13) on the outer wall of one end near the radial extension (212). The annular end face of the annular positioning part (13) facing away from the radial extension (212) cooperates with the annular step between the annular groove (5) and the mounting hole to realize the axial positioning of the bushing (1) in the mounting hole.