Rubber-hair-free and rubber-edge-free tire mold

Abstract

The invention relates to the field of tire molds, and discloses a rubber-hair-free and rubber-edge-free tire mold which comprises a pattern block, an upper side plate and a lower side plate, the pattern block, the upper side plate and the lower side plate are each provided with a plurality of air holes, exhaust assemblies are arranged in the air holes, and each exhaust assembly comprises a porous material and a protective shell arranged outside the porous material in a sleeving mode; the porous material is cylindrical, exhaust channels a are formed in the porous material in the X direction, the Y direction and the Z direction in a penetrating mode, a gap between the porous material and the protective shell is an exhaust channel b, and a gap between the protective shell and the air holes is an exhaust channel c. The exhaust assembly is arranged on the mold, gas can pass through the porous material, rubber does not flow out, so that rubber hair and rubber edges are not generated, a multi-way exhaust mode is arranged, exhaust is smooth, suffocation can be avoided, the tire vulcanization quality is improved, and compared with a traditional spring air hole sleeve, the air hole sleeve is convenient to disassemble, can be recycled, and is suitable for large-scale popularization and application. The cost is reduced.

Description

Technical Field

[0001] The invention relates to the field of tire moulds, in particular to a tire mould without rubber hair and rubber edge. Background Art

[0002] The appearance quality of tires is a key factor affecting tire reputation. When consumers replace tires, the first thing they pay attention to is whether the tires are beautiful. A tire with good appearance quality has greater competitiveness in the market, and the main factors affecting the appearance of tires are rubber hair and rubber edges. Major tire manufacturers are committed to reducing the rubber hair and rubber edges on the tire surface and have adopted many technologies.

[0003] During the vulcanization process of the tire, the vulcanizing bladder squeezes the tire embryo to fit it to the mold surface. There is air between the mold and the tire embryo. If the air cannot be discharged, the tire will not fit tightly with the mold, which will lead to insufficient sulfur and rubber in the tire, seriously affecting product quality. In order to discharge the air between the mold and the tire embryo, the traditional production method is to add exhaust holes on the tire mold for exhaust. This is also the reason why tire rubber hair is generated, because under high temperature and high pressure, the rubber flows into the air holes to form rubber hair.

[0004] In order to improve the appearance quality of tires, tire manufacturers solve the problem of rubber hair by using sheet molds, spring pore sleeves, and vacuuming the molds. However, these methods have disadvantages such as high mold investment costs, harsh production conditions, and high mold maintenance costs. Summary of the invention

[0005] The purpose of the present invention is to provide a rubber-free tire mold, which solves the above-mentioned technical problems by arranging porous materials in the pores of the tire mold.

[0006] The present invention discloses a tire mold without rubber hair and rubber edge, comprising a pattern block, an upper side plate and a lower side plate, wherein the pattern block, the upper side plate and the lower side plate are all provided with a plurality of air holes, and an exhaust component is arranged in the air hole, and the exhaust component comprises a porous material and a protective shell sleeved on the outside thereof;

[0007] The porous material is cylindrical, and has exhaust channels a extending through it in the X, Y, and Z directions; the gap between the porous material and the protective shell is the exhaust channel b; and the gap between the protective shell and the pores is the exhaust channel c;

[0008] A buffer assembly is arranged on the porous material, and the buffer assembly includes a hanging hook, and the hanging hook is loosely matched with a mounting ring. The mounting ring is fixed on a surface of the porous material away from the inner cavity of the mold, one end of the hanging hook is against the inner wall of the protective shell, and the other end of the hanging hook is sleeved with one end of a bending rod and has an interference fit, and the other end of the bending rod is connected to the limiting groove in the air hole.

[0009] The present invention provides a tire mold without rubber hair and rubber edge, wherein: the protective shell comprises a cylindrical shell and an hourglass-shaped shell, the cylindrical shell is clearance-matched with the air hole, and the hourglass-shaped shell is interference-fitted with the air hole.

[0010] The present invention provides a tire mold without rubber hair and rubber edge, wherein the hourglass-shaped shell is provided with two arc-shaped through holes, which are used to connect the exhaust channel b and the exhaust channel c.

[0011] The invention discloses a tire mold without rubber hair and rubber edge, wherein the sizes of the exhaust passage a in three directions are X>Y=Z from large to small.

[0012] The invention discloses a tire mould without rubber hair and rubber edge, wherein the porous material and the protective shell are flush with the inner cavity surface of the mould.

[0013] The invention discloses a tire mould without rubber hair and rubber edge, wherein the porous material is a ceramic porous material.

[0014] The present invention provides a tire mold without rubber hair and rubber edge, wherein a limiting component is arranged between the porous material and the protective shell, the limiting component comprises a circular ring, the circular ring is fixed to the protective shell, the circular ring is overlapped with a limiting plate, and a plurality of limiting plates are fixedly arranged along the circumference of the porous material.

[0015] The present invention provides a tire mold without rubber hair and rubber edge, wherein: one end of the hanging hook is fixed with an elastic sheet arranged obliquely, the elastic sheet can be bent, and the elastic sheet is against the inner wall of the protective shell.

[0016] The invention discloses a tire mold without rubber hair and rubber edge, wherein the other end of the hanging hook is fixed with a sleeve, and one end of the bending rod is sleeved in the sleeve.

[0017] The present invention provides a tire mold without rubber hair and rubber edge, wherein the limiting groove is annularly arranged on the inner wall of the air hole, and the bending rod can be inserted into the limiting groove.

[0018] The tire mold without rubber hair and rubber edge of the present invention is different from the prior art in that:

[0019] The tire mold without rubber hair and rubber edge of the present invention is provided with an exhaust component on the mold. The porous material can allow gas to pass through without the rubber flowing out, so no rubber hair or rubber edge is generated. In addition, a multi-channel exhaust method is provided to make the exhaust smooth and avoid holding air, so that the quality of tire vulcanization is improved. Furthermore, different from the traditional spring air hole sleeve, the present invention is easy to disassemble and can be recycled, thereby reducing costs.

[0020] The following is a further description of a tire mold without rubber hair and rubber edge of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a cross-sectional schematic diagram of an exhaust assembly and a buffer assembly;

[0022] Figure 2 It is a schematic diagram of the distribution of air holes in a tire mold without rubber hair and rubber edge;

[0023] Figure 3 yes Figure 1 A partial enlarged view of

[0024] Figure 4 yes Figure 1 A partial enlarged view of

[0025] Figure 5 It is a schematic diagram of the structure of porous materials;

[0026] Figure 6 This is an exploded view of the protective shell.

[0027] In the figure:

[0028] Air hole 13, exhaust component 2, porous material 21, exhaust channel a, exhaust channel b, exhaust channel c, protective shell 22, cylindrical shell 201, hourglass-shaped shell 202, arc-shaped through hole 203, buffer component 3, hanging hook 31, mounting ring 32, bending rod 33, limiting groove 34, elastic sheet 301, sleeve 302, limiting component 4, ring 41, limiting plate 42. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1 to Figure 6 The present invention provides two technical solutions, which specifically include the following embodiments:

[0031] Embodiment 1:

[0032] A tire mold without rubber hair and rubber edge comprises a pattern block, an upper side plate and a lower side plate, wherein the pattern block, the upper side plate and the lower side plate are all provided with a plurality of air holes 13, wherein the air holes 13 are cylindrical, and an exhaust assembly 2 is arranged in the air holes 13, wherein the exhaust assembly 2 comprises a porous material 21 and a protective shell 22 sleeved on the outside thereof;

[0033] The porous material 21 is cylindrical and has exhaust channels a extending through it in the X, Y and Z directions. The gap between the porous material 21 and the protective shell 22 is the exhaust channel b. The gap between the protective shell 22 and the pores 13 is the exhaust channel c.

[0034] The present invention arranges an exhaust component 2 on the mold, and the porous material 21 in the air hole 13 allows gas to pass through without the rubber flowing out, so no rubber hair or rubber edge is generated, and a multi-way exhaust method is arranged to make the exhaust smooth and avoid holding air, thereby improving the quality of tire vulcanization. Furthermore, different from the traditional spring air hole sleeve, the present invention is easy to disassemble and can be recycled, thereby reducing costs.

[0035] Wherein, the porous material 21 is a ceramic porous material.

[0036] The ceramics in the present invention have the advantages of corrosion resistance and high temperature resistance, and are very suitable for tire molds. Moreover, the ceramics are prepared by 3D printing, and have high precision and output, and low cost.

[0037] The porous material 21 and the protective shell 22 are flush with the surface of the inner cavity of the mold.

[0038] Among them, the porous material 21 has exhaust channels a extending through the three directions of X, Y and Z, and the gas can be discharged from these three directions. Of course, the porous material 21 can also have exhaust channels a in more directions. Considering the complexity of the preparation process of the porous material 21 and to ensure its own strength, the more pores there are, the lower the body strength of the material will be. Technicians in this field can set the pore direction and quantity of the porous material 21 according to actual needs.

[0039] It should be noted that the tread blocks, upper side plates and lower side plates are commonly used tire molds and are not shown in the accompanying drawings.

[0040] Among them, the tire vulcanized with the porous material 21 may have small, dense and non-influential small protrusions on the tread, which produces an unexpected effect, and can improve the wear resistance and grip of the tire.

[0041] As a further explanation of this example, refer to Figure 1 and Figure 6 The protective shell 22 includes a cylindrical shell 201 and an hourglass-shaped shell 202 . The cylindrical shell 201 is clearance-fitted with the air hole 13 , and the hourglass-shaped shell 202 is interference-fitted with the air hole 13 .

[0042] The present invention, by providing an hourglass-shaped shell 202, can, on the one hand, expand the cavity volume between the protective shell 22 and the inner wall of the air hole 13, so that the high-pressure gas has sufficient space to vent and reduce breath holding, and can further more effectively utilize the limited gap. On the other hand, this structure is suitable for clearance fit, and a common method is to use a tool or manually punch the protective shell 22 into the air hole 13. Compared with a circular structure, this structure is easier to deform and is more convenient to disassemble.

[0043] The matching clearance between the cylindrical shell 201 and the air hole 13 is 0.01 mm-0.03 mm.

[0044] The hourglass-shaped shell 202 is similar to an hourglass and is substantially cylindrical with a concave structure on the outer surface.

[0045] As a further explanation of this example, refer to Figure 6 The hourglass-shaped shell 202 has two arc-shaped through holes 203 for connecting the exhaust channel b and the exhaust channel c.

[0046] The present invention allows the gas in the exhaust channel b to enter the exhaust channel c, making the exhaust more unobstructed.

[0047] As a further explanation of this example, refer to Figure 5 The sizes of the exhaust channel a in three directions are X>Y=Z from large to small.

[0048] In the present invention, X refers to the up and down direction, Y refers to the left and right direction, and Z refers to the front and back direction. This structure can induce most of the gas to be discharged from the X direction, and the remaining gas flows to the exhaust channel b or the exhaust channel c from the Y or Z direction, thereby improving the gas passing rate and further avoiding holding breath.

[0049] Wherein, the cross-sectional width of the exhaust channel a in the X direction is less than 0.03 mm.

[0050] Embodiment 2:

[0051] The porous material 21 easily causes the problem of suffocation, and the ceramic material has poor plasticity. Therefore, in addition to the above-mentioned exhaust method, the present invention has made many improvements to make the exhaust smoother and protect the ceramic material from damage to improve the recycling efficiency of the ceramic material. The specific implementation methods are as follows:

[0052] Based on Example 1, refer to Figure 1 and Figure 4A buffer component 3 is arranged on the porous material 21, and the buffer component 3 includes a hanging hook 31, and the hanging hook 31 is clearance-fitted with a mounting ring 32. The mounting ring 32 is fixed on a surface of the porous material 21 away from the mold cavity, and one end of the hanging hook 31 is against the inner wall of the protective shell 22, and the other end of the hanging hook 31 is sleeved with one end of a bending rod 33 and has an interference fit, and the other end of the bending rod 33 is connected to a limiting groove 34 in the air hole 13.

[0053] The present invention provides a buffer assembly 3 to facilitate installation and removal of the porous material 21 and makes exhaust more unobstructed through a reasonable structure.

[0054] The buffer components 3 are provided in multiple groups along the circumference of the porous material 21. Considering the complexity of the process, those skilled in the art can set the number according to actual needs.

[0055] The matching clearance between the hook 31 and the mounting ring 32 is 0.03 mm to 0.06 mm.

[0056] It should be pointed out that when high-pressure gas is discharged, it will impact the porous material 21. However, the present invention allows the porous material 21 to produce a very small displacement, reducing damage to the porous material 21 and improving the reuse rate of the porous material 21. Traditional pore sleeves are easily deformed and difficult to repair.

[0057] As a further explanation of this example, refer to Figure 1 and Figure 6 A limiting assembly 4 is arranged between the porous material 21 and the protective shell 22 , and the limiting assembly 4 includes a circular ring 41 , and the circular ring 41 is fixed to the protective shell 22 , and the circular ring 41 overlaps with a limiting plate 42 , and a plurality of limiting plates 42 are fixedly arranged along the circumference of the porous material 21 .

[0058] The present invention limits the porous material 21 in the protective shell 22 through the limiting component 4, so that the porous material 21 is flush with the surface of the mold cavity. When the porous material 21 is placed into the protective shell 22, the porous material 21 is placed on the ring 41 through the limiting plate 42, which is convenient for positioning and disassembly.

[0059] At the same time, the limiting plate 42 and the ring 41 are overlapped at the upper and lower sides and do not contact each other in the radial direction, ensuring that a gap is formed between the porous material 21 and the protective shell 22. Moreover, the gaps between the plurality of limiting plates 42 can allow gas to be discharged, thereby minimizing the occurrence of gas blockage.

[0060] Of course, in order to facilitate the installation and positioning of the protective shell 22, a commonly used limiting means is to open a groove on the outer surface of the mold and set a shoulder on the protective shell 22. The two cooperate to achieve limiting. This is the existing technology, and the specific structure and connection method are not repeated here.

[0061] The limiting plate 42 is cylindrical, which can reduce the friction with the ring 41 .

[0062] The ring 41 may be welded between the cylindrical shell 201 and the hourglass-shaped shell 202 by welding.

[0063] As a further explanation of this example, refer to Figure 4 One end of the hook 31 is fixed with an elastic sheet 301 which is tilted and can be bent. The elastic sheet 301 is against the inner wall of the protective shell 22 .

[0064] The present invention can provide extrusion force through the elastic sheet 301. When the porous material 21 falls and is installed in the protective shell 22, the elastic sheet 301 bends from the root and presses against the protective shell 22. On the one hand, it ensures that an exhaust channel b is formed between the porous material 21 and the protective shell 22. On the other hand, when the gas impacts the ceramic porous material 21, the elastic sheet 301 can make the porous material 21 shake slightly, thereby reducing damage to the ceramic porous material 21. In addition, the elastic sheet 301 has a dynamically changing structure, which conforms to the driving force generated by the gas and can also reduce blockage of the gas.

[0065] As a further explanation of this example, refer to Figure 4 The other end of the hook 31 is fixed with a sleeve 302 , and one end of the bending rod 33 is sleeved in the sleeve 302 .

[0066] The present invention adopts an interference fit method, specifically, the bending rod 33 is constrained in the sleeve 302, with a certain damping, so that it cannot be easily rotated, but the bending rod 33 can be easily rotated by manpower. The bending rod 33 is often hammered into the sleeve 302 by manpower. This method can facilitate assembly and allow a relatively large dimensional tolerance. For structures with a small overall size, the simpler the assembly method, the more time-saving and labor-saving it is.

[0067] As a further explanation of this example, refer to Figure 4 The limiting groove 34 is annularly formed on the inner wall of the air hole 13, and the bending rod 33 can be inserted therein.

[0068] After the porous material 21 is placed in the protective shell 22, the bending rod 33 is twisted to insert it into the limiting groove 34 to ensure that the porous material 21 does not fall out of the protective shell 22. When the porous material 21 is taken out, the bending rod 33 is twisted in the opposite direction to achieve rapid disassembly.

[0069] At the same time, when the gas enters the porous material 21, the driving force of the gas may cause the porous material 21 to rotate. The limiting groove 34 is arranged in a ring shape, so that the bending rod 33 can rotate, thereby not hindering the rotation tendency of the porous material 21, further reducing the occurrence of breath holding and making the exhaust smoother.

Claims

1. A tire mold without rubber hair and rubber edge, comprising a tread block, an upper side plate and a lower side plate, characterized in that: The pattern block, the upper side plate and the lower side plate are all provided with a plurality of air holes (13), an exhaust assembly (2) is arranged in the air hole (13), and the exhaust assembly (2) comprises a porous material (21) and a protective shell (22) sleeved on the outside of the porous material (21); The porous material (21) is cylindrical and has exhaust channels a extending through it in the three directions of X, Y and Z; the gap between the porous material (21) and the protective shell (22) is the exhaust channel b; and the gap between the protective shell (22) and the pore (13) is the exhaust channel c; A buffer component (3) is arranged on the porous material (21), and the buffer component (3) comprises a hanging hook (31), and the hanging hook (31) is loosely matched with a mounting ring (32), and the mounting ring (32) is fixed on a surface of the porous material (21) away from the inner cavity of the mold, and one end of the hanging hook (31) is against the inner wall of the protective shell (22), and the other end of the hanging hook (31) is sleeved with one end of a bending rod (33) and is interference-fitted, and the other end of the bending rod (33) is connected to a limiting groove (34) in the air hole (13).

2. The tire mold without rubber hair and rubber edge according to claim 1, characterized in that: The protective shell (22) comprises a cylindrical shell (201) and an hourglass-shaped shell (202); the cylindrical shell (201) and the air hole (13) are clearance-fitted, and the hourglass-shaped shell (202) and the air hole (13) are interference-fitted.

3. The tire mold without rubber hair and rubber edge according to claim 2, characterized in that: The hourglass-shaped shell (202) is provided with two arc-shaped through holes (203) for connecting the exhaust channel b and the exhaust channel c.

4. The tire mold without rubber hair and rubber edge according to claim 3, characterized in that: The sizes of the exhaust passage a in three directions are X>Y=Z from large to small.

5. The tire mold without rubber hair and rubber edge according to claim 4, characterized in that: The porous material (21) and the protective shell (22) are flush with the surface of the inner cavity of the mold.

6. The tire mold without rubber hair and rubber edge according to claim 5, characterized in that: The porous material (21) is a ceramic porous material.

7. The tire mold without rubber hair and rubber edge according to claim 6, characterized in that: A limiting assembly (4) is arranged between the porous material (21) and the protective shell (22), the limiting assembly (4) comprising a circular ring (41), the circular ring (41) being fixed to the protective shell (22), the circular ring (41) being overlapped with a limiting plate (42), and a plurality of limiting plates (42) being fixedly arranged along the circumference of the porous material (21).

8. The tire mold without rubber hair and rubber edge according to claim 7, characterized in that: An elastic sheet (301) arranged obliquely is fixed to one end of the hook (31); the elastic sheet (301) is capable of bending, and the elastic sheet (301) abuts against the inner wall of the protective shell (22).

9. The tire mold without rubber hair and rubber edge according to claim 8, characterized in that: The other end of the hook (31) is fixed with a sleeve (302), and one end of the bending rod (33) is sleeved in the sleeve (302).

10. The tire mold without rubber hair and rubber edge according to claim 9, characterized in that: The limiting groove (34) is formed in an annular shape on the inner wall of the air hole (13), and the bending rod (33) can be inserted therein.

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