WO2020093640A1

WO2020093640A1 - Air jacket for tire vulcanization mold

Info

Publication number: WO2020093640A1
Application number: PCT/CN2019/078177
Authority: WO
Inventors: 吴波
Original assignee: 吴波
Priority date: 2018-11-06
Filing date: 2019-03-14
Publication date: 2020-05-14

Abstract

An air jacket for a tire vulcanization mold. The air jacket is in close fit with a bottom hole on the tire vulcanization mold, is integrally in a round rod shape, and comprises an exhaust part (1) and a fastening part (3); an outer diameter of the exhaust part (1) is slightly less than an inner diameter of a corresponding position of the bottom hole, so as to form an exhaust gap in which air inlet is allowed but glue feeding is not allowed between the exhaust part and the bottom hole; and the fastening part (3) is in close fit with the bottom hole and has an exhaust channel in communication with an external environment, wherein the exhaust channel is in communication with the exhaust gap. The solution simplifies the structure of the air jacket and improves the production efficiency.

Description

Air sleeve for tire vulcanization mold

Technical field

The utility model relates to the technical field of tire vulcanization molds, in particular to an air sleeve for tire vulcanization molds.

Background technique

If the green tire is made of raw rubber to form a shaped tire, it needs to undergo high-temperature and high-pressure vulcanization through a vulcanizer. The vulcanizing machine usually includes a mold with a cavity. A capsule part is arranged at the center of the cavity of the mold, and the tire blank is centered on the capsule part by using an external tire loading and unloading device to achieve the heating and pressing effect. When the green tire is placed in the cavity, there is initially a gap between the outer wall of the green tire and the cavity wall of the mold. After the tire blank is thermally expanded, how to exclude the air at the gap without affecting the molding effect of the tire blank, thereby ensuring that the tire blank is smoothly expanded to the cavity wall and the final molding becomes a problem.

The structure of the spring air sleeve in the prior art usually includes a sleeve-shaped valve housing as an outer shell, a cylindrical mandrel is coaxially sleeved in the valve housing, and a spring is sleeved on the mandrel. The bottom of the mandrel and one end of the valve housing form a one-way gear matching, and the top of the mandrel and the other end of the valve housing have a sealing mating surface that can form a one-way gear matching, and the above two one-way gears match the limit The directions are opposite to each other. In practical application, use the through hole opened in the mold to connect the cavity and the exhaust hole of the external exhaust device, insert the spring gas sleeve into the exhaust hole, and make the end of the valve housing sealing and matching surface match the type. The cavity wall is set flush. During the vulcanization process, the green tire expands due to heat, and the gap between the green tire and the mold cavity wall gradually decreases. Under the action of the spring, the sealing mating surface of the mandrel and the valve housing is in an open state, so the air in the gap overflows along the gap of the sealing mating surface and is excluded by the external exhaust device. Until the tire is completely vulcanized, there is no gap between the tire and the cavity wall of the mold, at this time, the sealing mating surface of the mandrel and the valve housing is pressed by the tire, so that the above sealing mating surface completely fits and seals. After the tire vulcanization is completed and removed, the mandrel is reset under the action of elasticity, and you can prepare for a new round of vulcanization operation.

The actual problems of the above-mentioned spring air sleeves are as follows: First, the spring air sleeves are used as pneumatic parts, and their inner springs are often stuck and damaged due to factors such as rubber infiltration or elastic fatigue. The number of exhaust holes, that is, the installation of spring gas sleeves is extremely large, which leads to the extremely high cost of replacement one by one as a whole, and the maintenance and installation are also extremely cumbersome. Secondly, because the vulcanization process is inevitably accompanied by high temperature, as a metal spring, it is easy to produce elastic failure after being affected by high temperature, resulting in a sharp decrease in spring service life. These are all adversely affecting the actual use of the spring air sleeve.

Therefore, how to simplify the structure of the gas jacket, reduce the frequency of overhaul and replacement of the gas jacket, and improve the production efficiency are technical problems that need to be solved urgently in recent years in this field.

Utility model content

In view of the existing supplements in the prior art, the present invention provides an air sleeve for tire vulcanization molds, which has a simple structure, is easy to use, and improves production efficiency.

In order to solve the above technical problems, the utility model adopts the following technical solutions:

An air sleeve for a tire vulcanization mold tightly cooperates with the bottom hole on the tire vulcanization mold. The air sleeve has a round rod shape as a whole and includes an exhaust portion and a fastening portion; the outer diameter of the exhaust portion is slightly smaller than The inner diameter of the corresponding portion of the aforementioned bottom hole forms an exhaust gap between the two without air intake; the fastening portion is closely matched with the aforementioned bottom hole, and it has an exhaust passage communicating with the outside world, the row The air channel communicates with the exhaust gap.

The above technical solutions can be further improved by the following technical measures:

As a further improvement, the exhaust passage is located inside the fastening portion, and it is an exhaust hole penetrating along the length direction of the fastening portion, and the exhaust portion has a communication hole penetrating in the radial direction of the exhaust portion. The air hole and the communication hole communicate with each other.

As a further improvement, the exhaust passage is located outside the fastening portion, and it is an air outlet groove that penetrates along the length direction of the fastening portion, and the air outlet groove extends into the exhaust portion to communicate with the exhaust gap. The air outlet groove is curved, and it surrounds the outer peripheral surface of the fastening portion. Alternatively, the air outlet groove is linear, and it is opened on the outer peripheral surface of the fastening portion. There are at least three gas outlet slots.

As a further improvement, the lower portion of the fastening portion is provided with a tapered guide portion whose diameter gradually decreases. The taper of the guide is 4 °.

As a further improvement, the outer diameter of the exhaust portion is 0.04-0.06 mm smaller than the inner diameter of the corresponding portion of the bottom hole, correspondingly, the width of the formed exhaust gap is 0.02-0.03 mm.

As a further improvement, the upper end of the exhaust portion has a tapered slope surface to enhance the strength of the root of the rubber wool when glue overflow occurs in the exhaust gap. The length of the tapered slope is 1 mm, and the taper is 0.57 °.

As a further improvement, the middle part of the gas sleeve has a blind hole communicating with the outside world, and the bottom of the blind hole has a plurality of micro holes that communicate with the cavity of the mold and are not exhausted. The number of the micro holes is 100-500 mesh.

Due to the adoption of the above technical solutions, the utility model has the following technical effects:

The air sleeve of the utility model has no elastic structure, thus effectively avoiding the problems that the spring air sleeve is easily stuck by overflowing glue and fatigue failure, greatly reducing the frequency of maintenance, and significantly improving the production efficiency. In addition, the air sleeve of the utility model has a simple structure and low cost, and it can be simply pressed into the bottom hole during use, which is very convenient.

BRIEF DESCRIPTION

FIG. 1 is a schematic structural diagram of the first embodiment.

2 is a schematic diagram of the assembly structure of the first embodiment.

FIG. 3 is a schematic structural diagram of the second embodiment.

4 is a schematic diagram of the assembly structure of the second embodiment.

5 is a schematic structural view of Embodiment 3.

6 is a schematic structural view of Embodiment 3.

Description of reference signs:

1. Exhaust part; 11. Micro hole 11; 2. Communication hole; 3. Fastening part; 4. Guide part; 5. Outlet hole; 6. Ring groove. 7. Outlet slot.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the utility model more clear, the utility model will be described in further detail below with reference to the drawings. The components of embodiments of the present invention generally described and illustrated in the drawings herein can be arranged and designed in a variety of different configurations. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

It should be noted that similar reference numerals and letters indicate similar items in the following drawings, therefore, once an item is defined in one drawing, there is no need to further define and explain it in subsequent drawings.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" The azimuth or position relationship indicated is based on the azimuth or position relationship shown in the drawings, only to facilitate the description of the present invention and simplify the description, rather than indicating or implying that the device or element referred to must have a specific orientation The azimuth structure and operation can not be understood as a limitation of the present invention. In addition, the terms "first", "second", and "third" are for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a Disassembly connection, or integral connection; it can be mechanical connection or electrical connection; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

In the following, some embodiments of the present invention will be described in detail with reference to the drawings. In the case of no conflict, the features in the following embodiments can be combined with each other.

Example one:

An air sleeve for tire vulcanization molds as shown in FIGS. 1 and 2 is used to produce tireless tires, and tightly fits with the bottom hole on the tire vulcanization mold. The entire air sleeve is round rod-shaped and includes exhaust Part 1 and the fastening part 3; the outer diameter of the exhaust part 1 is smaller than the corresponding inner diameter of the bottom hole to form an exhaust gap between the two; the fastening part 3 closely fits with the aforementioned bottom hole, and wherein The part has an air outlet 5 extending along its axial direction, and the air outlet 5 communicates with the outside world; the exhaust portion 1 has a communication hole 2 disposed along the radial direction thereof, and the air outlet 5 passes through the communication hole 2 and The exhaust gap is connected.

It should be noted that the outer diameter of the exhaust portion 1 is smaller than the inner diameter of the corresponding portion of the bottom hole means that, first, the bottom hole may be an integral part or may be divided into two parts. When the bottom hole is an integral part, its inner diameter size must first meet the tight fitting installation relationship with the fastening part 3, at this time, the outer diameter of the exhaust part 1 needs to be processed to be smaller than the inner diameter size and also smaller than the fastening The outer diameter dimension of the part 3. However, when the bottom hole is two parts, one part is matched with the fastening part 3 and the other part is matched with the exhaust part 1, and the inner diameter of the part matched with the fastening part 3 is suitable for tight fitting requirements, and The inner diameter of the fitting portion of the exhaust portion 1 is slightly larger than the outer diameter of the exhaust portion 1. In this case, the outer diameter of the exhaust portion 1 may be smaller than the outer diameter of the fastening portion 3 or may be larger than the outer diameter of the fastening portion 3.

The tail portion of the exhaust portion 1 has an annular groove 6 opened along the outer periphery, and the communication hole 2 communicates with the annular groove 6. The cross section of the annular groove 6 is arc-shaped, and its radius R is 0.2 mm.

The lower portion of the fastening portion 3 is provided with a tapered guide portion 4 whose diameter gradually decreases. The taper of the guide 4 is 4 °.

The outer diameter of the exhaust portion 1 is 0.04 mm smaller than the inner diameter of the corresponding portion of the bottom hole, correspondingly, the width of the formed exhaust gap is 0.02 mm.

It should be noted that the length of the guide portion 4 is 1 times the diameter of the fastening portion 3, and a 4 ゜ taper guide angle is designed. The length of the fastening portion 3 is 1 times its diameter, and the diameter is larger than the bottom hole on the mold 0.005mm, the length of the exhaust part 1 is 2mm, and the diameter is 0.04mm smaller than the diameter of the bottom hole. At the same time, a R0.2mm circumferential annular groove 6 is installed at the bottom of the exhaust part 1 at the junction of the annular groove 6 The cloth cuts four communication holes 2 with a diameter of 0.5 mm by laser, and the communication holes 2 communicate with the air outlet holes 5 in the fastening part 3. The diameter of the air outlet hole 5 is 1/2 of the diameter of the fastening portion 3.

It should be further noted that after the axial processing of the bottom hole of the mold body is completed, the hole is reamed and reamed with a reamer to 0.005 mm smaller than the outer diameter of the fastening portion 3 of the air sleeve, so that the fastening portion 3 and the bottom hole are tightly fitted. When assembling, directly insert the air sleeve into the air hole, which is flush with the outer arc surface of the mold cavity.

It should be further noted that during the tire vulcanization process, the gas is discharged through the 0.02 mm gap between the mold body and the air sleeve, and is discharged into the air outlet hole 5 in the center of the air sleeve through the annular groove 6 and the communication hole 2, and then further flows out of the mold.

It should also be noted that the width of the exhaust gap is 0.02mm, and only the exhaust will not remove the rubber, which can remove the tire hairs of the tire, save the rubber material, and greatly improve the appearance quality of the tire, making the tire safer.

In this embodiment, the upper end portion of the exhaust portion 1 has a tapered slope surface to enhance the strength of the root of the rubber wool when the rubber overflow occurs in the exhaust gap. The length of the tapered slope is 1 mm, and the taper is 0.57 °. The function of the tapered slope surface is that when the rubber overflow occurs in the exhaust gap, due to the existence of the tapered slope surface, the thickness of the root of the rubber wool can be increased, thereby increasing the strength of the root of the rubber wool, so that the rubber wool Pull out of the exhaust gap without breaking. In fact, the size of the tapered slope can also be adjusted according to actual needs, but it needs to meet the requirements of exhaust and non-discharge.

In addition, in this embodiment, the diameter of the exhaust portion 1 is 0.04 mm smaller than the bottom hole, and the width of the corresponding exhaust gap is 0.02 mm. In other embodiments, the diameter of the exhaust portion 1 may also be 0.06 mm smaller than the bottom hole, and the width of the corresponding exhaust gap is 0.03 mm. The diameter of the exhaust part 1 is smaller than the bottom hole by 0.04mm to 0.06mm to meet the requirement of air intake without glue.

Example 2:

As shown in FIGS. 3 and 4, an air sleeve for a tire vulcanization mold is tightly fitted with a bottom hole on the tire vulcanization mold. The entire air sleeve has a round rod shape and includes an exhaust portion 1 and a fastening portion 3; The outer diameter of the exhaust portion 1 is slightly smaller than the inner diameter of the corresponding portion of the bottom hole to form an exhaust gap between the two that does not enter the inlet. The exhaust passage is located outside the fastening portion, and it is along The air outlet groove 7 penetrating in the longitudinal direction of the fastening portion extends into the exhaust portion to communicate with the exhaust gap. The air outlet groove 7 is curved, and it surrounds the outer peripheral surface of the fastening portion. Alternatively, the air outlet groove 7 is linear, and it is opened on the outer peripheral surface of the fastening portion. There are at least three gas outlet slots 7.

In this embodiment, the air outlet groove 7 is a spiral groove provided on the outer circumference of the fastening portion 3. The tail portion of the exhaust portion 1 has an annular groove 4 provided along the outer periphery, and the air outlet groove 7 communicates with the exhaust gap through the annular groove 4. The cross section of the annular groove 4 is arc-shaped, and its radius R is 0.2 mm. The lower portion of the fastening portion 3 is provided with a tapered guide portion 3 whose diameter gradually decreases. The taper of the guide portion 3 is 4 °. The outer diameter of the exhaust portion 1 is 0.04 mm smaller than the inner diameter of the corresponding portion of the bottom hole, correspondingly, the width of the formed exhaust gap is 0.02 mm.

It should be noted that the length of the guide portion 3 is twice the diameter of the fastening portion 3, and a 4 ゜ taper guide angle is designed, and the length of the fastening portion 3 is twice its diameter, and the diameter is larger than the bottom hole on the mold 0.005mm, the length of the exhaust part 1 is 2mm, the diameter is 0.04mm smaller than the diameter of the bottom hole, and at the bottom of the exhaust part 1, a circumferential annular groove 4 with a radius of R0.2mm is connected to the connection of the annular groove 4 , Use a lathe to process a spiral air outlet 7 until the tail of the guide 3;

It should be further noted that after the axial processing of the bottom hole of the mold body is completed, the hole is reamed and reamed with a reamer to be 0.005 mm smaller than the outer diameter of the fastening portion 3 of the air sleeve, so that the fastening portion 3 and the bottom hole are tightly fitted. When assembling, directly insert the air sleeve into the air hole, which is flush with the outer arc surface of the mold cavity.

It should be further noted that during the tire vulcanization process, gas is discharged through the 0.02 mm gap between the mold body and the air sleeve, and discharged into the spiral air outlet groove 7 on the outer circumference of the air sleeve through the annular groove 6, and then further flows out of the mold.

It should also be noted that the width of the exhaust gap is 0.02mm, and only the exhaust will not remove the rubber, which can remove the tire hair, save rubber materials, and greatly improve the appearance of the tire, making the tire safer.

In addition, in this embodiment, the shape of the air outlet groove 7 is a spiral shape, that is, a curved shape. In other embodiments, other shapes of the air outlet groove 7 may be provided, such as straight lines, diagonal lines, or curves of other shapes. .

Example three:

As shown in FIGS. 5 and 6, this embodiment is further optimized on the basis of the second embodiment, that is, a blind hole communicating with the outside is provided in the middle of the gas jacket, and the bottom of the blind hole has multiple The micro-holes 11 are connected to the cavity and are not exhausted by the exhaust gas. The micro-holes 11 are provided on the top surface of the exhaust part 1. The number of the micro-holes 11 is 100-500 mesh. In this embodiment, the micropore 11 has a mesh number of 281 and a pore diameter of 0.03 mm. The blind hole corresponds to the air outlet 5 in the first embodiment, and the air outlet 5 penetrates the fastening portion 3 and the partial exhaust portion 1.

In other embodiments, the number of micropores 11 is 342 mesh, the diameter of micropores 11 is 0.03 mm, and the distribution pattern of micropores 11 is that the outer circumference forms a circle, the inner circumference forms a concentric circle, and between the two circles The micropores 11 are distributed radially in the radial direction. Alternatively, the number of micropores 11 is 191 mesh, the diameter of micropores 11 is 0.03 mm, and the distribution of micropores 11 is such that a five-pointed star is formed inside, and other micropores 11 fill the space outside the five-pointed star and form a circle. Alternatively, the diameter of the micro-holes 11 should meet the characteristics of non-discharge of exhaust gas, so the diameter is between 0.025 and 0.06 mm, and the mesh size of the micro-holes 11 is 100 to 500.

The specific embodiments described in this document are only examples of the spirit of the present invention. Those skilled in the art to which the utility model belongs can make various modifications or additions to the described specific embodiments or substitute in a similar manner, but they will not deviate from the spirit of the utility model or go beyond the appended claims The defined range.

Although this article uses 1. exhaust part; 2. communication hole; 3. fastening part; 4. guide part; 5. air outlet; 6. annular groove; 7. air outlet and other terms, but does not Exclude the possibility of using other terms. These terms are only used to describe and explain the essence of the utility model more conveniently; interpreting them as any kind of additional restrictions is contrary to the spirit of the utility model.

Claims

An air sleeve for tire vulcanization mold tightly fits with the bottom hole on the tire vulcanization mold, characterized in that the air sleeve is round rod-shaped as a whole, and includes an exhaust portion and a fastening portion; The outer diameter is slightly smaller than the inner diameter of the corresponding part of the bottom hole to form an air gap between the two without air intake; the fastening part is closely matched with the bottom hole, and it has an exhaust channel that communicates with the outside world , The exhaust passage communicates with the exhaust gap.
The gas jacket according to claim 1, wherein the exhaust passage is located inside the fastening portion, and it is an exhaust hole penetrating along the length direction of the fastening portion, and the exhaust portion has In the communication hole penetrating radially, the exhaust hole communicates with the communication hole.
The gas jacket according to claim 1, wherein the exhaust passage is located outside the fastening portion, and it is an air outlet slot penetrating along the length of the fastening portion, and the air outlet groove extends into the exhaust portion to Connect the exhaust gap.
The air jacket according to claim 3, wherein the air outlet groove is curved and surrounds the outer peripheral surface of the fastening portion.
The air jacket according to claim 3, wherein the air outlet groove is linear, and it is opened on the outer circumferential surface of the fastening portion.
The gas jacket according to claim 5, wherein there are at least three gas outlet grooves.
The gas jacket according to claim 1, wherein the lower portion of the fastening portion is provided with a tapered guide portion whose diameter gradually decreases.
The gas jacket according to claim 7, wherein the taper of the guide portion is 4 °.
The gas jacket according to claim 1, wherein the outer diameter of the exhaust portion is 0.04-0.06mm smaller than the inner diameter of the corresponding portion of the bottom hole, correspondingly, the width of the formed exhaust gap is 0.02-0.03 mm.
The gas jacket according to claim 1, wherein the upper end of the exhaust portion has a tapered slope surface to enhance the strength of the root of the rubber wool when the rubber overflow occurs in the exhaust gap.
The gas jacket according to claim 10, wherein the length of the tapered slope is 1 mm, and the taper is 0.57 °.
The gas jacket according to claim 1, wherein the middle part has a blind hole communicating with the outside, and the bottom of the blind hole has a plurality of micro holes communicating with the cavity of the mold and venting without discharging glue. The number of holes is 100-500 mesh.