A high-performance spring air hole sleeve

Abstract

A high-performance spring air hole sleeve, comprising a valve housing, a mandrel and a spring. The two ends of the mandrel are a frustum portion and a spigot portion. One end of the hole cavity of the valve housing is a tapered hole that is sealingly matched with the frustum portion of the mandrel, and the other end is a blocking portion that restricts the spigot portion of the mandrel outside the valve housing. The spring is sleeved on the mandrel and abuts against the frustum portion and the blocking portion at both ends respectively; a notch groove is provided at the top of the spigot portion of the mandrel or at the top of the blocking portion of the valve housing to form a multi-lobe structure; the valve housing is integrally in a cylindrical step shape, the end of the outer cylinder of the blocking portion is a conical surface, and the surface of the outer cylinder at the tapered hole has a number of circumferential ring grooves arranged in parallel; the connection between the frustum portion of the mandrel and the shaft body has a transition shaft section with a diameter larger than the shaft body, an arc-shaped ring groove is provided at the connection point between the transition shaft section and the frustum portion, and the end face of the frustum portion of the mandrel is set in a mushroom head shape. The present invention can have a higher matching precision with the exhaust port of the mold, better stability, better exhaust effect, the product is beautiful and flat after vulcanization, and the product quality is better.

Description

Technical Field

[0001] The present invention relates to an exhaust accessory for a tire vulcanization and molding die, and more particularly to a high-performance spring air hole sleeve, belonging to the technical field of tire vulcanization. Background Art

[0002] Currently, it is well known that when manufacturing a tire, in a die for vulcanizing a green tire that has completed the molding process, it is necessary to discharge the air between the green tire and the die. Usually, a number of air discharge ports are provided on the die. When vulcanizing the tire, the air is directly discharged through the discharge ports, and the rubber will overflow through the discharge ports, thus forming a lot of overflowed rubber on the tire after vulcanization. To overcome this drawback, an air hole sleeve installed in the discharge port has been designed.

[0003] The structure of the air hole sleeve generally includes a housing and a valve body. The valve body is installed inside the housing. One end of the valve body is limited outside the housing, and a venting notch is provided on the housing at this end; the other end of the valve body is in sealing cooperation with the housing. This end of the air hole sleeve is directly installed in the discharge port; a spring is installed on the valve body. In the initial state, the spring disconnects the sealing between the valve body and the housing, and the gas in the die cavity is discharged through the disconnected sealing fit.

[0004] During the entire use process, the installation and mating degree of the air hole sleeve in the discharge port is required to be relatively high. If it is too loose, it is easy to shake, affecting the use effect and there is a risk of falling off. If it is too tight, there is a disadvantage that it is not convenient to disassemble and replace.

[0005] In addition, the valve body of the air hole sleeve is in direct contact with the tire rubber, and the depth of the valve body penetrating into the rubber affects the appearance of the tire. The end face of the existing valve body of the air hole sleeve is a flat surface. When there is an axial position difference between the valve body and the housing, obvious grooves with step differences will be generated on the tire. During the overall installation, it is not only easy to produce an uneven appearance on the tire surface, especially more obvious on the arc surface of the tire surface, affecting the product quality. Summary of the Invention

[0006] In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a high-performance spring air hole sleeve, which has a higher matching accuracy, better stability, better exhaust effect with the die discharge port, the product is beautiful and flat after vulcanization, and the product quality is better.

[0007] The technical solution adopted by the present invention to solve its technical problems is as follows: It includes a valve housing, a mandrel, and a spring. The two ends of the mandrel are respectively a frustum part and a spigot part. The mandrel is installed in the valve housing. The valve housing has a through-hole cavity from top to bottom. One end of the cavity is a tapered hole that is sealingly matched with the frustum part of the mandrel, and the other end is a retaining part that restricts the spigot part of the mandrel outside the valve housing. The spring is sleeved on the mandrel, and its two ends respectively abut against the end faces of the frustum part and the retaining part; a notch groove A is provided at the top of the spigot part of the mandrel to form a multi-lobe structure of the spigot part. This notch groove A extends axially along the mandrel to its shaft part, or a notch groove B is provided at the top of the retaining part of the valve housing to form a multi-lobe structure at this position. This notch groove B extends axially along the valve housing to its valve part; the overall shape of the valve housing is in the form of a two-stage cylindrical step. The outer diameter of the second outer cylinder corresponding to the tapered hole is larger than the outer diameter of the first outer cylinder corresponding to the retaining part. The end of the first outer cylinder is a conical surface, and several parallel circumferential ring grooves are formed on the surface of the second outer cylinder; at the connection between the frustum part of the mandrel and the shaft part, there is a transition shaft section with a diameter larger than the shaft part. An arc-shaped ring groove is provided at the connection point of the transition shaft section and the frustum part. The end face of the frustum part of the mandrel is set in the shape of a mushroom head.

[0008] Compared with the prior art, a high-performance spring air hole sleeve of the present invention has a gas venting function by providing circumferential ring grooves outside the valve housing, and finally achieves the purpose of improving the installation accuracy and preventing shaking. The design of the arc-shaped ring groove can reduce the inclination angle of the contact part, make the positioning more reliable, and at the same time further ensure better fitting accuracy and prevent shaking, with good use effects; the design of the transition shaft section can strengthen the structural strength of the lower part of the sealing surface, and the stress point is not easily damaged during disassembly, achieving efficient disassembly and assembly and facilitating repeated use. By adopting a mushroom head-style valve core end face, during vulcanization of the tire, it is not easy to produce a step difference, improving the appearance of the vulcanized tire and enhancing the product quality. In summary, the comprehensive performance of the spring air hole sleeve of the present invention has been greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The present invention will be further described below in conjunction with the drawings and embodiments.

[0010] Figure 1 It is a schematic structural diagram of the first mandrel of the present invention.

[0011] Figure 2a It is a half-sectional front view of the first valve housing of the present invention.

[0012] Figure 2b It is a left view of the first valve housing of the present invention.

[0013] Figure 2c It is an assembly diagram of the first mandrel and the first valve housing of the present invention, in which the valve housing is shown in a half-sectional form, and the spring is also omitted.

[0014] Figure 3aIt is the half-sectional front view of the second valve housing of the present invention.

[0015] Figure 3b It is the left view of the second valve housing of the present invention.

[0016] Figure 3c It is the assembly drawing of the first mandrel and the second valve housing of the present invention, in which the valve housing is shown in a half-sectional form and the spring is omitted.

[0017] Figure 4a It is the half-sectional front view of the third valve housing of the present invention.

[0018] Figure 4b It is the left view of the third valve housing of the present invention.

[0019] Figure 4c It is the assembly drawing of the first mandrel and the third valve housing of the present invention, in which the valve housing is shown in a half-sectional form and the spring is omitted at the same time.

[0020] Figure 5 It is the schematic structural diagram of the second mandrel of the present invention, which is used for assembly with the first, second and third valve housings.

[0021] Figure 6 It is the schematic structural diagram of the third mandrel of the present invention.

[0022] Figure 7 It is the schematic structural diagram of the fourth mandrel of the present invention.

[0023] Figure 8 It is the half-sectional front view of the fourth valve housing of the present invention, which is used for cooperation with the third and fourth mandrels.

[0024] Figure 9 It is the half-sectional front view of the fifth valve housing of the present invention, which is used for cooperation with the third and fourth mandrels.

[0025] Figure 10 It is the half-sectional front view of the sixth valve housing of the present invention, which is used for cooperation with the third and fourth mandrels.

[0026] In the figure, 100, mandrel; 101, spigot part; 102, shaft body; 103, transition shaft section; 104, frustum part; 105, mushroom head shape; 106, arc-shaped ring groove; 107, notch groove A; 200, valve housing; 201, first outer cylinder; 202, second outer cylinder; 203, tapered hole; 204, circumferential ring groove; 205, cavity; 206, notch groove B; 207, retaining part; 208, longitudinal notch groove. Detailed implementation manners

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] Preferred Embodiment 1:

[0029] As Figure 1 、 Figure 2a 、 Figure 2b and Figure 2c shown, a high-performance spring air hole sleeve provided in this embodiment includes a valve housing 200, a mandrel 100, and a spring. The two ends of the mandrel 100 are respectively a frustum portion 104 and a spigot portion 101. The mandrel 100 is installed in the valve housing 200. The valve housing 200 has a through hole cavity 205 in the up and down direction. One end of the hole cavity 205 is a tapered hole 203 that is hermetically fitted with the frustum portion 104 of the mandrel 100, and the other end is a retaining portion 207 that restricts the spigot portion 101 of the mandrel 100 outside the valve housing 200. The spring is sleeved on the mandrel 100, and its two ends respectively abut against the end faces of the frustum portion 104 and the retaining portion 207; a notch groove B206 is provided at the top of the retaining portion 207 of the valve housing 200 to form a multi-lobe structure at this position, and the notch groove B206 extends axially along the valve housing 200 to its valve body; the overall shape of the valve housing 200 is in a two-stage cylindrical stepped shape, including a second outer cylinder 202 corresponding to the tapered hole 203 and a first outer cylinder 201 corresponding to the retaining portion 207. The outer diameter of the second outer cylinder 202 is greater than the outer diameter of the first outer cylinder 201. Preferably, the connection between the first outer cylinder 201 and the second outer cylinder 202 of the valve housing 200 is in a tapered surface transition; the end of the first outer cylinder 201 is a conical surface, and several parallel circumferential ring grooves 204 are formed on the surface of the second outer cylinder 202; the connection between the frustum portion 104 of the mandrel 100 and the shaft body 102 has a transition shaft section 103 with a diameter larger than the shaft body 102. Obviously, the diameter of the transition shaft section 103 needs to be smaller than the minimum diameter of the frustum portion 104. An arc-shaped ring groove 106 is provided at the connection point between the transition shaft section 103 and the frustum portion 104, and the end face of the frustum portion 104 of the mandrel 100 is set in a mushroom head shape 105.

[0030] In this embodiment, the rabbet portion 101 is a combination of a cylinder and a round-head cone. The gear portion 207 of the valve housing 200 is a stepped hole, and the large-diameter end of the stepped hole is located on the outside. The maximum diameter of the stepped hole is smaller than the inner diameter of the hole cavity 205. To meet the design function of the structure itself, the minimum diameter of the stepped hole needs to be larger than the diameter of the shaft body 102 of the mandrel and smaller than the maximum outer diameter of the rabbet portion 101 of the mandrel 100, and the maximum diameter of the stepped hole is smaller than the maximum outer diameter of the rabbet portion 101 of the mandrel 100.

[0031] In a preferred embodiment, when there are multiple circumferential annular grooves 204, the circumferential annular grooves 204 communicate with each other through longitudinal notch grooves 208 parallel to the axis direction and then extend to the stepped transition position of the valve housing 200. Specifically, the longitudinal notch grooves 208 are one or two / more symmetrically distributed in the circumferential direction. The function of the longitudinal notch grooves 208 is also to fix the installation position, prevent shaking, and further improve the installation accuracy.

[0032] In a preferred embodiment, chamfer structures are provided at the mating hole end of the hole cavity 205 of the valve housing 200 and at its inner hole shoulder to facilitate the insertion and extraction of the mandrel 100 from the hole cavity 205 of the valve housing 200.

[0033] Preferred Embodiment Two:

[0034] As shown in Figure 1 、 Figure 3a 、 Figure 3b and Figure 3c A high-performance spring air hole sleeve provided in this embodiment is different from that in Preferred Embodiment One in that, in this embodiment, the gear portion 207 of the valve housing 200 is a cylindrical hole, and the diameter of the cylindrical hole is smaller than the inner diameter of the hole cavity 205. To meet the design function of the structure itself, the diameter of the cylindrical hole needs to be larger than the diameter of the shaft body 102 of the mandrel 100 and smaller than the maximum outer diameter of the rabbet portion 101 of the mandrel 100.

[0035] Preferred Embodiment Three:

[0036] As shown in Figure 1 、 Figure 4a 、 Figure 4b and Figure 4c A high-performance spring air hole sleeve provided in this embodiment is different from that in Preferred Embodiment One in that, in this embodiment, the gear portion 207 of the valve housing 200 is a conical hole, the large-diameter opening of the conical hole is located on the outside, and the maximum diameter of the conical hole is smaller than the inner diameter of the hole cavity 205. To meet the design function of the structure itself, the maximum diameter of the conical hole needs to be larger than the diameter of the shaft body 102 of the mandrel 100 and smaller than the maximum outer diameter of the rabbet portion 101 of the mandrel 100.

[0037] Preferred Embodiment Four:

[0038] As Figure 5 , Figure 2a , Figure 2b and Figure 2c shown, a high-performance spring air hole sleeve provided in this embodiment is different from the first preferred embodiment in that, in this embodiment, the stop portion 101 is a frustum of a cone, which, like the combination of a cylinder and a round head cone, is conducive to increasing the force application contact area and facilitating rapid assembly and disassembly.

[0039] Preferred Embodiment Five:

[0040] As Figure 5 , Figure 3a , Figure 3b and Figure 3c shown, a high-performance spring air hole sleeve provided in this embodiment is different from the second preferred embodiment in that, in this embodiment, the stop portion 101 is a frustum of a cone.

[0041] Preferred Embodiment Six:

[0042] As Figure 5 , Figure 4a , Figure 4b and Figure 4c shown, a high-performance spring air hole sleeve provided in this embodiment is different from the third preferred embodiment in that, in this embodiment, the stop portion 101 is a frustum of a cone.

[0043] Preferred Embodiment Seven:

[0044] As Figure 6 and Figure 8 shown, a high-performance spring air hole sleeve provided in this embodiment is different from the first preferred embodiment in that, in this embodiment, a notch groove A107 is provided at the top end of the stop portion 101 of the mandrel 100 to form a multi-lobe structure of the stop portion 101, and the notch groove A107 extends axially along the mandrel 100 to its shaft body 102.

[0045] Preferred Embodiment Eight:

[0046] As Figure 6 and Figure 9 shown, a high-performance spring air hole sleeve provided in this embodiment is different from the seventh preferred embodiment in that, in this embodiment, the gear position portion 207 of the valve housing 200 is a cylindrical hole, and the inner diameter of the cylindrical hole is smaller than the inner diameter of the hole cavity 205.

[0047] Preferred Embodiment Nine:

[0048] As Figure 6 and Figure 10As shown, a high-performance spring air hole sleeve provided in this embodiment is different from the seventh preferred embodiment. In this embodiment, the gear position portion 207 of the valve housing 200 is a conical hole, the large-diameter opening of the conical hole is located on the outside, and the maximum diameter of the conical hole is smaller than the inner diameter of the hole cavity 205.

[0049] Tenth Preferred Embodiment:

[0050] As Figure 7 and Figure 8 shown, a high-performance spring air hole sleeve provided in this embodiment is different from the seventh preferred embodiment. In this embodiment, the stop portion 101 is a frustum of a cone.

[0051] Eleventh Preferred Embodiment:

[0052] As Figure 7 and Figure 9 shown, a high-performance spring air hole sleeve provided in this embodiment is different from the seventh preferred embodiment. In this embodiment, the stop portion 101 is a frustum of a cone.

[0053] Twelfth Preferred Embodiment:

[0054] As Figure 7 and Figure 10 shown, a high-performance spring air hole sleeve provided in this embodiment is different from the seventh preferred embodiment. In this embodiment, the stop portion 101 is a frustum of a cone.

[0055] Before the present invention is used, the valve housing 200, the mandrel 100, and the spring are first assembled to obtain a finished spring air hole sleeve. At this time, the sealing fit between the valve housing 200 and the mandrel 100 is released under the action of the spring, that is, the frustum portion 104 of the mandrel 100 does not contact the conical hole 203 of the valve housing 200. Then, multiple spring air hole sleeves are respectively installed in the exhaust ports of the molding die, and then vulcanization treatment is carried out; during the vulcanization process, the excess gas enters the hole cavity 205 of the valve housing 200 through the gap between the frustum portion 104 of the mandrel 100 and the conical hole 203 of the valve housing 200, and is then discharged to the outside through the notch groove A107 or the notch groove B206. When the vulcanization ends, the sealing fit between the valve housing 200 and the mandrel 100 is formed under the action of an external force; when the vulcanized tire is taken out, the external force disappears, and the elastic recovery of the spring causes the spring air hole sleeve to return to its initial state. Then, it is removed from the exhaust port one by one and can be reused for the exhaust of the tire vulcanization die cavity next time.

[0056] The above are only the preferred embodiments of the present invention, and do not impose any formal limitations on the present invention. Any simple modifications and equivalent changes made to the above embodiments based on the technical essence of the present invention all fall within the protection scope of the present invention.

Claims

1. A high-performance spring air hole sleeve, comprising a valve housing (200), a mandrel (100) and a spring. The two ends of the mandrel (100) are respectively a frustum portion (104) and a spigot portion (101). The mandrel (100) is installed in the valve housing (200). The valve housing (200) has a through hole cavity (205) from top to bottom. One end of the hole cavity (205) is a tapered hole (203) that is sealingly fitted with the frustum portion (104) of the mandrel (100), and the other end is a stop portion (207) that restricts the spigot portion (101) of the mandrel (100) outside the valve housing (200). The spring is sleeved on the mandrel (100), and its two ends respectively abut against the end faces of the frustum portion (104) and the stop portion (207); The characteristics are as follows: The described mandrel (100) is provided with a notch groove A (107) at the top of the rabbet portion (101) to form a multi-lobe structure of the rabbet portion (101). The notch groove A (107) extends axially along the mandrel (100) to its shaft body (102). Or the described valve housing (200) is provided with a notch groove B (206) at the top of the gear position portion (207) to form a multi-lobe structure at the top of the gear position portion (207). The notch groove B (206) extends axially along the valve housing (200) to its valve body. The overall shape of the valve housing (200) is a two-stage cylindrical stepped shape. The outer diameter of the second outer cylinder (202) corresponding to the tapered hole (203) is larger than the outer diameter of the first outer cylinder (201) corresponding to the gear position portion (207). The end of the first outer cylinder (201) is a conical surface. A plurality of circumferential ring grooves (204) arranged in parallel are formed on the surface of the second outer cylinder (202). At the connection between the frustum portion (104) of the mandrel (100) and the shaft body (102), there is a transition shaft section (103) with a diameter larger than that of the shaft body (102). An arc-shaped ring groove (106) is provided at the connection point between the transition shaft section (103) and the frustum portion (104). The end face of the frustum portion (104) of the mandrel (100) is set in the shape of a mushroom head (105). When there are multiple circumferential ring grooves (204), the circumferential ring grooves (204) are connected by longitudinal grooves parallel to the axis direction and extend to the step transition position of the valve housing (200).

2. The high-performance spring air hole sleeve according to claim 1, characterized in that: The described longitudinal groove is one or two / more symmetrically distributed in the circumferential direction.

3. A high-performance spring air hole sleeve according to claim 1, characterized in that: The described rabbet portion (101) is a frustum of a cone or a combination of a cylinder and a round head cone.

4. A high-performance spring air hole sleeve according to claim 3, characterized in that: The gear position portion (207) of the described valve housing (200) is a cylindrical hole, and the inner diameter of the cylindrical hole is smaller than the inner diameter of the hole cavity (205).

5. A high-performance spring air hole sleeve according to claim 3, characterized in that: The gear position portion (207) of the described valve housing (200) is a stepped hole, and the large-diameter end of the stepped hole is located on the outside. The maximum inner diameter of the stepped hole is smaller than the inner diameter of the hole cavity (205).

6. The high-performance spring air hole sleeve according to claim 3, characterized in that: The gear position portion (207) of the described valve housing (200) is a tapered hole, and the large-diameter opening of the tapered hole is located on the outside. The maximum inner diameter of the tapered hole is smaller than the inner diameter of the hole cavity (205).

7. A high-performance spring air hole sleeve according to claim 1 or 2, characterized in that: The connection between the first outer cylinder (201) and the second outer cylinder (202) of the described valve housing (200) is transitioned by a conical surface.

8. A high-performance spring air hole sleeve according to claim 1 or 2, characterized in that: Chamfer structures are provided at the mating hole end of the hole cavity (205) of the described valve housing (200) with the rabbet portion (101) and at its inner hole shoulder.

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