CN212554639U - Mold for producing rubber-free tire - Google Patents

Abstract

The utility model discloses a mould for producing no rubber hair tire is equipped with a sealing member between upper cover and the upper cover closing plate in this mould, is equipped with the upper cover sealing member between upper cover closing plate and the well die sleeve, is equipped with between upper cover and the decorative pattern piece and covers the slide, is equipped with bottom plate seal assembly on the bottom plate, is equipped with down the steel ring sealing member down between lower side plate and the lower steel ring, is equipped with ejector retainer sealing member between ejector retainer and the upper cover. The utility model discloses can solve the problem that there is the glued hair on tire goods surface, improve the surface quality of tire product, maintain simultaneously and human cost greatly reduced, need not process the exhaust hole moreover on tire mould, practiced thrift mould manufacturing cost.

Description

Mold for producing rubber-free tire

Technical Field

The utility model relates to a make equipment for the tire, concretely relates to mould for tire vulcanization.

Background

At present, the tire industry competes to enter a blanching stage, the profit margin of each tire manufacturer is greatly reduced, and in order to ensure the market share and the profit margin, each manufacturer improves the quality and appearance market of tire products, thereby occupying a high-end product market with higher profit margin. In the competition of the high-end market, the appearance effect of the tire plays a crucial role in the sale of the tire, wherein the rubber problem is an important factor influencing the appearance of the tire. Therefore, various manufacturers adopt various technologies to reduce the rubber fuzz on the surface of the tire.

When the rubber tire is vulcanized, because of the embryo is extruded in the mould, a plurality of closed cavities can be formed between the embryo and the mould, if the air in the cavities is not discharged, the rubber material can not be completely filled on the surface of the mould finally, so that local rubber shortage is caused, the vulcanization effect is influenced, the vulcanization degree of each part is uneven, the product quality is influenced, and even serious accidents such as tire burst are caused when the rubber tire is used. In order to exhaust air in the cavity, most tire factories exhaust air by adding air exhaust holes on the mold in the production process, and the diameter of the air exhaust holes is generally more than 0.6 mm. In order to ensure the uniform size of the air holes and easy maintenance in the use process, the common air holes are processed in a mode that a fitter drills holes on the surface of the cavity and then installs an air sleeve (see figure 1), and the part which is higher than the surface of the cavity after the air sleeve is installed is uniformly processed by the fitter, so that the air sleeve is ensured to be level with the surface of the cavity. The number of the air sleeves installed on one pair of tire molds is about 2000, the air sleeves are mainly distributed on the tire surface and the tire side, and after the tire blank is pressurized in the vulcanization process, redundant air pockets can be exhausted through the exhaust holes. After punching, the rubber inevitably fills the air vent holes to form rubber wool in the extrusion process due to the fluidity of the rubber

After the tire is vulcanized, a piece of dense and hemp rubber is finally formed on the surface of the tire, and some tire factories are specially provided with a cutting procedure for trimming off the rubber on the tire surface for the purpose of attractiveness. However, in order to protect the character effect on the sidewall and the sidewall, the rubber of the sidewall is generally subjected to a retaining treatment. Because of the existence of the rubber wool, the appearance effect of the tire can not be consistent with the design effect all the time, and meanwhile, in order to treat the rubber wool, the added working procedures also cause the cost to be increased. At the in-process of pruning the glue hair, it is rotatory to make the tire body through equipment usually, and operating personnel handheld scraper removes the glue hair with the help of revolving force removes about the tire surface, and the glue hair of rejecting is short to play the effect that can not improve the outward appearance quality, and the removal amount is too big very fragile tire tread, influences the performance of tire, and consequently this process is higher to the requirement of personnel and equipment.

At present, in order to solve the problem of rubber fuzz on the surface of a tire, the prior art improves a tire mold.

Firstly, the pattern blocks are partitioned, so that the airtight cavity is provided with an exhaust seam for exhausting, and the occurrence of glue burrs is avoided, wherein the partitioning mode of the pattern blocks is divided into pitch distribution and longitudinal distribution.

The method is characterized in that the air is exhausted by utilizing the assembly gaps among the pitches of the pattern blocks according to the pitch distribution, most of domestic patents originate from a patent CN1454767A of Michelin company, as shown in figure 2, the cavity parts in the pattern blocks are partitioned according to the arrangement of the pitches of the tire, so that each area has enough air exhaust seams to ensure the air exhaust, and finally, after the vulcanization of the tire is finished, only the traces of the air exhaust seams are left on the surface of the tire without rubber burrs left by air holes.

The pattern of the longitudinal distribution is divided into a plurality of blocks according to the longitudinal direction, and then the exhaust is carried out by utilizing the assembly gaps among the blocks, which can be seen in detail in a patent CN105459301B of Haemai company, as shown in figure 3. And partitioning the pattern block middle cavity part according to longitudinal arrangement, so that each area has enough exhaust seams to ensure the exhaust of gas, and finally, after the vulcanization of the tire is finished, the surface of the tire only leaves traces of the exhaust seams without rubber burrs left by air holes.

Above-mentioned technical scheme can only solve the gluey hair problem on the tread surface, can't get rid of to the gluey hair on the tire side wall surface.

The pattern blocks are complex in structure, the control of gaps among the blocks is not easy to realize, and the gaps must be controlled within the range of 0.01 mm-0.02 mm, so that the gaps can ensure that air can pass through and tire rubber cannot overflow. The processing and assembling cost is more than 2 times of that of a normal die.

In the production process, the overflow of the sizing material can block part of the exhaust gaps, and once one gap is blocked, the whole pattern block is required to be disassembled and cleaned. And once the rusting condition occurs, parts of the rusting part are scrapped and need to be manufactured again, and the whole die is reassembled. Resulting in maintenance and repair costs several times that of a normal tire mold and also seriously affecting the productivity of the tire.

Secondly, the spring air sleeve is used, when the rubber material is completely filled, the spring air sleeve is closed, so that the rubber material cannot enter the air hole, and the occurrence of rubber hair is avoided. The spring air sleeve structure is shown in fig. 4, and when the cavity is completely filled with rubber, the spring air sleeve is closed, so that rubber burrs are avoided. After the spring air sleeves are arranged at the exhaust positions on the tire mold, the requirement of no rubber burrs on the surface can be met during tire vulcanization, and air can be exhausted from gaps of the spring air sleeves.

The maintenance, the dismantlement and the change of spring gas cover need professional instrument and professional, and troublesome poeration needs to carry out the dismouting operation at the decorative pattern piece tow sides. In the production of semi-steel tires, when one thousand tires are produced by each pair of molds, all spring air sleeves (about 2000 air holes in each pair of molds, all the spring air sleeves are required to be used) need to be repaired and maintained, and when ten thousand tires are produced, all the spring air sleeves need to be integrally replaced. If the maintenance process is incomplete, part of the spring air sleeve can be failed, so that the air can not be exhausted, and the surface of the tire is defective.

The requirement of the spring air sleeve on the fluidity of the rubber material is severe, and when the fluidity of the rubber material is high, the material flow easily enters the air sleeve to block the air sleeve. However, in order to ensure the performances of wet skid resistance, comfort, controllability, bending flexibility resistance and the like of the tire, the design hardness is generally controlled to be ShoreA 60-65 degrees and ShoreA 50-55 degrees, the rubber flowability is good in the hardness range, and the use condition of the spring air sleeve is difficult to meet. Even if the conditions are met, the air jacket is gradually blocked due to complex production conditions (dust, oils, blank sizes are different, extrusion) in actual production. Therefore, the technical popularization of the spring air sleeve has certain limitation.

The spring air sleeve can avoid the occurrence of rubber hair, but circular traces can be left on the surface of the tire to influence the appearance effect.

And thirdly, in the initial stage of the vulcanization process, the whole mold is vacuumized after the mold is closed, and the occurrence of rubber burrs is avoided.

The vacuumizing mold is characterized in that gaps between all parts of the tire mold, which are communicated with air, are sealed by sealing rings, so that a closed space is formed inside the mold after the whole mold is completely closed. After the mould is closed, the vacuum pump is used for pumping out air in the mould through the vacuum valve arranged on the mould, and finally the mould is in a vacuum state, so that the air pocket is avoided and the occurrence of glue hair is avoided.

Because the size of the tire blank is larger than that of the cavity in the mold, after the mold is completely closed, the tire blank is attached to the pattern blocks and the side plates of the mold, and the tire blank contacts and presses the pattern blocks and the side plates, so that a plurality of independent air-filled sealed cavities (air chambers) are formed in the mold, as shown in fig. 5, and the air chambers (hereinafter, referred to as air chambers) form a sealed state between the tire blank and the mold. Even inside the mould has formed airtight environment through sealed after the outer lane compound die, the accessible vacuum pump is taken out the vacuum and is formed vacuum environment, but the air in these nest air chambers also because do not communicate with each other with the inside space of taking out the air of mould and lead to unable exhaust, consequently can appear and nest the gas phenomenon. In order to avoid the air trapping phenomenon, the air in the air trapping chambers must be exhausted by arranging exhaust holes or exhaust inserts on the air trapping chambers.

Therefore, the rubber burrs or exhaust insert traces of about 70 percent still exist on the surface of the tire by directly using the vacuumizing mould and vacuumizing after closing, and the rubber burrs still need to be manually removed. The purposes of improving appearance and saving working procedures can not be achieved.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a mould for producing no rubber hair tire, it can solve the problem that there is rubber hair on the tire goods surface, improves the surface quality of tire product, maintains simultaneously and human cost greatly reduced, need not process the exhaust hole moreover on tire mold, has practiced thrift mould manufacturing cost (a pair mould has about 2000 exhaust holes of controlling, the exhaust hole position all needs installation gas cover, the manufacturing cost is 12000 yuan for ordinary gas cover, 24000 yuan for spring gas cover).

In order to achieve the above object, the present invention provides the following technical solutions:

a tire vulcanization mold comprises a secondary steel ring, an upper side plate, an upper cover sealing plate, a T-shaped block, a middle mold sleeve, a pattern block, a guide strip, an inclined plane antifriction plate, an arch-shaped seat, a bottom plate antifriction plate, a lower side plate, a lower steel ring, a lower chuck plate, an upper chuck plate, an ejector and a tire capsule; a top sealing element is arranged between the upper cover and the upper cover sealing plate, an upper cover sealing element is arranged between the upper cover sealing plate and the middle die sleeve, an upper cover upper sliding plate is arranged between the upper cover and the pattern block, a bottom plate sealing assembly is arranged on the bottom plate, a lower steel ring sealing element is arranged between the lower side plate and the lower steel ring, and an ejector sealing element is arranged between the ejector and the upper cover;

the bottom plate sealing assembly comprises an end face sealing element, a floating plate, a reset part, a positioning plate, a radial sealing element and a skirt plate; the skirt plate is fixedly sleeved outside the middle die sleeve, the reset component is pressed on the bottom plate, the floating plate is pressed on the reset component, the positioning plate is fixed on the bottom plate and sleeved outside the floating plate and the reset component, a radial sealing element is arranged between the positioning plate and the floating plate, the middle die sleeve can be inserted into the floating plate, the skirt plate can touch the floating plate, an end face sealing element is arranged between the floating plate and the skirt plate, a vacuumizing interface is arranged on the positioning plate, and a bottom plate sealing element is arranged between the positioning plate and the bottom plate.

Preferably, the top seal is a top gasket.

Preferably, the upper cover sealing member is an upper cover sealing ring.

Preferably, the upper cover upper sliding plate is sleeved outside the upper side plate.

Preferably, the bottom plate sealing member is a bottom plate sealing ring.

Preferably, the lower steel ring sealing element is a lower steel ring sealing ring.

Preferably, the ejector sealing element is an ejector sealing ring.

The end face sealing element is an end face sealing ring, the radial sealing element is a radial sealing ring, and the reset component is a spiral spring.

Preferably, a fine adjustment pressing block which is pressed on the upper cover sealing plate and used for adjusting the gap between the upper cover and the upper cover sealing plate is arranged between the upper cover and the upper cover sealing plate, and a fine adjustment pressing block which is pressed on the positioning plate and used for adjusting the gap between the positioning plate and the bottom plate is arranged between the positioning plate and the bottom plate.

The utility model provides a mould for producing no rubber hair tire through the peculiar sealed mode of action control before closing the mould to tire mold and add, makes the mould cavity be in encapsulated situation promptly before complete closure. At the moment, the tire blank is not in contact with the mold, and no air pocket is generated. In the whole vacuumizing process, the synchronous action of the vacuum pump and the vulcanizing machine is adopted, so that air in the closed space is continuously pumped out, the pressure of a tire capsule is adjusted, the pressure difference position borne by the tire blank is ensured to be unchanged, the tire blank is prevented from being subjected to expansion deformation due to reduction of external pressure, the tire blank is prevented from contacting with a mold pattern block, and a nest air chamber is formed. Before the air extraction starts, the central mechanism (capsule control mechanism) of the vulcanizer is regulated to drive the green tire to make micro-motion between the upper and lower side plates and the upper and lower steel rings, so that a certain space is formed between the side plates, the steel rings and the green tire, and air possibly sealed between the side plates, the steel rings and the green tire is extracted. When the end is about to bleeding, through the pressure adjustment of vulcanizer action and capsule for mould and capsule are along with carrying out a small amount of activities at the process of evacuation, guarantee that gas completely discharges and tire child embryo position location is accurate in the mould confined space, accomplish the secondary design of child embryo, and when finally making tire mould compound die accomplish, there is not the air to exist completely between whole mould surface and the tire child embryo, can not produce nest gas phenomenon. Therefore, the tire surface is free from any defects (air pocket, rubber fuzz and the like) caused by air under the condition of not processing air holes, and the production of the tire with zero rubber fuzz is realized.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings.

FIG. 1 is a diagram of a gas jacket component;

FIG. 2 is a pitch distribution exhaust map;

FIG. 3 is a graph of longitudinal distributed venting;

FIG. 4 is a diagram of a spring air jacket configuration;

FIG. 5 is a schematic view of an isolated sealed space;

FIG. 6 is a view of a conventional segmented mold;

fig. 7 is a structural diagram of a mold for producing a non-rubberized-rough tire according to an embodiment of the present invention;

FIG. 8 is a schematic view of a conventional tire curing process;

fig. 9 is a schematic view showing a sealing position of a mold for producing a non-rubber-tired tire according to an embodiment of the present invention;

fig. 10 is a schematic view of a sealing position of a mold for producing a non-rubber-tired tire according to an embodiment of the present invention;

fig. 11 is a schematic view of a fine tuning press block in a mold for producing a non-rubber-tired tire according to an embodiment of the present invention;

fig. 12 is a schematic view of a bottom plate sealing assembly in a mold for producing a non-rubber-tired tire according to an embodiment of the present invention.

Description of reference numerals:

1.1, an ejector; 1.2, auxiliary steel rings; 1.3, mounting a steel ring; 1.4, upper side plate; 1.5, an upper cover; 1.6, sealing a plate of an upper cover; 1.7, T-shaped blocks; 1.8, upper ring; 1.9, pattern blocks; 2.1, an arch seat; 2.2, a middle mold sleeve; 2.3, an inclined plane antifriction plate; 2.4, a guide strip; 2.5, a bottom plate; 2.6, a bottom plate antifriction plate; 2.7, lower side plate; 2.8, steel rings are arranged; 2.9, a lower chuck; 3.1, tire blanks; 3.2, tire bladder; 3.3, mounting a chuck;

1. a secondary steel ring; 2. finely adjusting a pressing block; 3. steel rings are arranged; 4. a top seal ring; 5. an upper side plate; 6. an upper cover; 7. an upper cover sealing plate; 8. the upper cover is provided with a sliding plate; 9. a T-shaped block; 10. an upper cover sealing ring; 11. a middle die sleeve; 12. pattern blocks; 13. a guide strip; 14. an inclined plane wear plate; 15. an arcuate seat; 16. a floor seal assembly; 17. a bottom plate seal ring; 18. a base plate; 19. a bottom plate wear plate; 20. a lower side plate; 21. a steel ring is arranged; 22. a lower steel ring sealing ring; 23. a lower chuck plate; 24. a chuck is arranged; 25. a top pusher; 26. a pusher seal ring; 27. a tire bladder; 28. a tire blank;

1601. an end face seal ring; 1602. a floating plate; 1603. a reset component; 1604. positioning a plate; 1605. A radial seal ring; 1606. and (4) skirting boards.

Detailed Description

In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrases "comprising … …" or "comprising … …" does not exclude the presence of additional elements in a process, method, article, or terminal that comprises the element. Further, herein, "greater than," "less than," "more than," and the like are understood to exclude the present numbers; the terms "above", "below", "within" and the like are to be understood as including the number.

The traditional segmented mold structure, as shown in fig. 6, includes an ejector 1.1, a secondary steel ring 1.2, an upper steel ring 1.3, an upper side plate 1.4, an upper cover 1.5, an upper cover sealing plate 1.6, a T-shaped block 1.7, an upper ring 1.8, a pattern block 1.9, an arch base 2.1, a middle mold sleeve 2.2, an inclined plane wear plate 2.3, a guide strip 2.4, a bottom plate 2.5, a bottom plate wear plate 2.6, a lower side plate 2.7, a lower steel ring 2.8, a lower chuck plate 2.9, a tire blank 3.1, a tire bladder 3.2, and an upper chuck plate 3.3.

The tire vulcanization mold provided by the embodiment is improved on the basis of the conventional segmented mold structure.

As shown in fig. 7, the tire vulcanizing mold provided in this embodiment includes a secondary steel ring 1, an upper steel ring 3, an upper side plate 5, an upper cover 6, an upper cover sealing plate 7, a T-shaped block 9, a middle mold sleeve 11, a pattern block 12, a guide strip 13, an inclined plane wear-reducing plate 14, an arch seat 15, a bottom plate 18, a bottom plate wear-reducing plate 19, a lower side plate 20, a lower steel ring 21, a lower chuck 23, an upper chuck 24, an ejector 25, and a tire bladder 27.

The mold is connected to the upper part of the vulcanizer using an ejector 25 and a middle mold 11, and the bottom plate 18 is connected to the vulcanizer base. The upper and lower chucks 23, 24 and the auxiliary rim 1 and the lower rim 21 are connected with a center mechanism (not shown in fig. 2) and a tire bladder 27. Wherein, the central mechanism becomes the capsule operating mechanism, its main function is to pack the tire capsule 27 into the tire embryo 28 before vulcanizing, to the tire embryo 28 fixed type; after vulcanization, the tire bladder 27 is pulled out of the tire, and the tire is separated from the lower mold and the bead by the cooperation of the release mechanism, and finally the tire bladder 27 is pulled out of the tire. The relative movement of the upper cover 6 and the middle mold sleeve 11 of the mold causes the radial (contraction) and centrifugal (expansion) movements of the arcuate seats 15 and the blocks 12 in the circumferential direction through the guide strips 13 and the T-blocks 9, so that the tire is ejected from the mold after vulcanization. Fig. 7 shows a hot plate type inclined plane segmented mold in the segmented mold, and the structure is also suitable for the hot plate type conical surface segmented mold.

The mold for producing the non-rubber-tired tire provided by the embodiment is improved from the existing mold in that:

a top sealing element is arranged between the upper cover 6 and the upper cover sealing plate 7, an upper cover sealing element is arranged between the upper cover sealing plate 7 and the middle die sleeve 11, an upper cover upper sliding plate 8 is arranged between the upper cover 6 and the pattern block 12, a bottom plate sealing assembly 16 is arranged on the bottom plate 18, a lower steel ring sealing element is arranged between the lower side plate 20 and the lower steel ring 21, and a top pusher sealing element is arranged between the top pusher 25 and the upper cover 6.

The bottom plate seal assembly comprises an end face seal, a floating plate 1602, a reset member 1603, a positioning plate 1604, a radial seal, a skirt plate 1606; the apron 1606 is tightly sleeved outside the middle die sleeve 11, the reset part 1603 is pressed on the bottom plate 18, the floating plate 1602 is pressed on the reset part 1603, the positioning plate 1604 is fixed on the bottom plate and sleeved outside the floating plate 1602 and the reset part 1603, a radial seal is arranged between the positioning plate 1604 and the floating plate 1602, the middle die sleeve 11 can be inserted into the floating plate 1602, the apron 1606 can touch the floating plate 1602, an end face seal is arranged between the floating plate 1602 and the apron 1606, a vacuumizing interface is arranged on the positioning plate 1604, and a bottom plate seal is arranged between the positioning plate 1604 and the bottom plate 18.

Preferably, the top sealing element is a top sealing ring 4, the upper cover sealing element is an upper cover sealing ring 10, the upper cover upper sliding plate 8 is sleeved outside the upper side plate 5, the bottom plate sealing element is a bottom plate sealing ring 17, the lower steel ring sealing element is a lower steel ring sealing ring 22, and the ejector sealing element is an ejector sealing ring 26. The end face seal is an end face seal ring 1601, the radial seal is a radial seal ring 1605, and the reset component 1603 is a coil spring.

In a further improvement, a fine adjustment pressing block 2 is arranged between the upper cover 6 and the upper cover sealing plate 7, and the fine adjustment pressing block 2 is pressed on the upper cover sealing plate 7 and used for adjusting a gap between the upper cover 6 and the upper cover sealing plate 7. A fine adjustment pressing block is also arranged between the positioning plate 1604 and the bottom plate 18, and the fine adjustment pressing block is pressed on the positioning plate 1604 and used for adjusting the gap between the positioning plate 1604 and the bottom plate 18.

Unlike the conventional segmented mold structure (see fig. 6), the sealing positions in the tire vulcanizing mold provided in the present embodiment are divided into a bottom plate sealing ring 17 and a bottom plate sealing assembly 16. The top seal is divided into a top seal ring 4 and an upper cover seal ring 10. The lower steel ring sealing ring 22 and the ejector sealing ring 26 seal the central mechanism, and various sealing structures can be used at various sealing positions, not only the sealing structures are used for sealing.

The bottom seal assembly 16 and the upper cap seal ring 10 in the tire vulcanization mold described above can float in the circumferential direction through the gap between the minute pressure adjusting blocks 2, and automatic centering operation is realized.

In the application process of the common vacuumizing method, vacuumizing operation is performed after the mold is completely closed. In the embodiment, the mould and the equipment are sealed, so that an integral closed space is formed in the mould closing process (before complete closing), and the vacuumizing operation can be performed before complete closing. As shown in fig. 7, the bottom seal assembly 16 and the upper cover seal plate 7 may float in the circumferential direction through the adjustable gap of the trimming press block 2, so that an automatic centering operation may be achieved, a tire bead phenomenon caused by over-positioning of the mold may be eliminated, and the life of the seal ring may be extended, as shown in fig. 11.

The bottom sealing assembly 16 changes the contact between the sealing ring and the steel piece from axial sealing to end sealing in each die assembly process in a mode of loading the axial sealing ring into the assembly and then sealing the end face from the top, thereby avoiding the damage of the sealing ring caused by repeated axial plugging and unplugging movement.

The use method of the mould for producing the rubber-free tire comprises the following steps:

the normal tire vulcanization process is shown in fig. 8, and the whole process comprises tire blank hoisting, tire blank pot loading, pre-setting, mold closing, secondary setting, vulcanization, mold opening and tire unloading. During tire vulcanization production, after a tire blank is placed into the center mechanism, the center mechanism and the lower steel ring 21 fall on the lower side plate 20, the upper half part of the tire mold (the middle mold sleeve 11, the arch-shaped seat 15, the pattern block 12, the upper cover 7 and small parts fixed on the four large parts) moves to the upper part of the tire blank, and after the tire mold reaches a fixed position, the upper cover 7 is pushed to move downwards through the upper oil cylinder of the vulcanizing machine, so that the arch-shaped seat 15 and the pattern block 12 are opened in the radial direction. The opening of the upper half of the tire mold is completed. Then placing the blank into a embryo for pre-shaping. The above apparatus action is consistent with normal vulcanization. Namely, the procedures of hoisting the green tire, loading the green tire into a pot and presetting in the vulcanization procedure are consistent with the normal vulcanization.

When the vulcanization process advances to the mold closing process, the opened upper half part continues to move downwards, when the pattern blocks 12 contact the bottom plate wear-resisting plate 19, the middle mold sleeve 11 moves downwards, and the upper cover 7 starts to move upwards relative to the middle mold sleeve 11 under the combined action of the arch-shaped seat 15 and the oil cylinder of the vulcanizing machine. According to calculation, when the pattern block 12 is just about to contact the green tire, the vulcanizing machine stops operating, and the middle die sleeve 11, the bottom plate sealing assembly 16 and the upper cover sealing ring 10 just enter the sealing position, so that an integral closed space is formed inside the die without generating air pockets. The central mechanism of the vulcanizer moves the green tire up a small distance to ensure that the space between the green tire 28 and the lower side plate 20 can communicate with the space in the mold, but the upward moving part does not exceed the sealing distance of the lower steel ring sealing ring 22. The position of the middle mold sleeve 11 and the position of the blocks 12 when the sealing is completed are shown in fig. 9 and 10.

After this action is completed, the air inside the mold is evacuated through a vacuum valve (the vacuum valve is installed at the evacuation interface, which is shown in fig. 7) provided at the outside of the mold. With the reduction of the air pressure, the pressure in the curing bladder needs to be adjusted accordingly to prevent the green tire from deforming due to the vacuum. When the vacuum degree meets the requirement, the central mechanism and the lower steel ring 21 drive the tire blank 28 to fall back to the lower side plate 20, the middle mold sleeve 11 continues to move downwards until the pattern blocks 12 are completely matched with the upper and lower side plates 5 and 20 (in the moving process of the central mechanism and the middle mold sleeve 11, the vacuum degree in the mold is ensured through sliding sealing all the time), the pressure of the vulcanization capsule is recovered to be normal vulcanization pressure, the mold closing is completed, and vulcanization is started after other vulcanization processes are carried out.

When the mold is closed, the vulcanizing machine cannot provide enough force to completely center the position of the middle mold sleeve 11 and the bottom plate due to the large weight and large movement amplitude of the mold. In order to ensure that the bottom sealing ring 17 is not damaged due to the precision of the equipment during the movement, a bottom sealing assembly 16 which can prevent the middle die sleeve 11 from being inserted into the sealing ring continuously to cause the damage of the sealing ring is specially designed, as shown in fig. 12. The radial seal ring 1605 is placed in the floating plate 1602 connected to the mold bottom plate 18, the apron 1606 capable of performing end face pressing with the floating plate 1602 is added on the middle mold sleeve 11, when the apron 1606 is pressed down, the apron 1606 and the end face seal ring 1601 on the floating plate 1602 are sealed, and the damage of the seal ring caused by the fact that the radial seal ring 1605 is inserted back and forth in the floating plate 1602 is avoided. Meanwhile, in order to ensure that the bottom plate sealing assembly 16 is always in a sealing state in the movement process, a reset component 1603 (spiral spring) is added to provide sealing pressure of the end face sealing ring 1601.

In the production process of a tyre with the specification of 195R14, in the mold closing process of a vulcanizing machine, the position of a vulcanizing machine oil cylinder connected with a mold upper cover flange 50mm before complete mold closing is changed into a micro-motion mode, and the oil cylinder is micro-moved to the position 5mm above the complete mold closing position. After the middle die sleeve 11 moves downwards to a position 33mm above the complete die closing position, the die is in a complete sealing state. The central mechanism drives the tire blank 28 to move upwards by 2mm, and after the mold stops moving, the inner space of the mold is about 0.04m³(40L), pumping out almost all air within 15 seconds by the air pumping design, namely 40L (according to a vacuum pump selection manual, the power of a vacuum pump arranged on the vulcanizing machine is 1500W), and opening an air pumping valve arranged on the mold under the driving of the vacuum pump to perform air pumping operation.

Along with the process of air exhaust, the pressure in the tire bladder 27 is gradually reduced from 0.2Mpa to 0.05Mpa, so that the tire blank is prevented from deforming due to the increase of pressure difference caused by air exhaust. When the vacuum degree of the inner cavity of the mold reaches the gauge pressure of-0.1 Mpa, air suction is completed, the upper cover 6 of the mold is moved to the mold closing position, and meanwhile, the central mechanism and the green tire 28 are pressed down to the mold closing position. Then, the middle die sleeve 11 moves down until the die is completely closed, and vulcanization is performed.

The mould for producing the rubber-less tire and the using method thereof ensure that the mould cavity is in a sealed state before being completely closed by action control before the tire mould is closed and a special sealing mode is additionally arranged. At the moment, the tire blank is not in contact with the mold, and no air pocket is generated. In the whole vacuumizing process, the synchronous action of the vacuum pump and the vulcanizing machine is adopted, so that air in the closed space is continuously pumped out, the pressure of a tire bladder is adjusted, the pressure difference position borne by the tire blank is ensured to be unchanged, the tire blank is prevented from being expanded and deformed due to the reduction of external pressure, the tire blank is prevented from contacting with a mold pattern block, and a nest air chamber is formed. Before the air extraction starts, the central mechanism (capsule control mechanism) of the vulcanizer is regulated to drive the green tyre to make micro-motion between the upper and lower side plates and the upper and lower steel rings, so that a certain space is formed between the side plates, the steel rings and the green tyre, and air which is possibly sealed between the side plates, the steel rings and the green tyre is extracted. When the end is about to bleeding, through the pressure adjustment of vulcanizer action and capsule for mould and capsule are along with carrying out a small amount of activities at the process of evacuation, guarantee that gas completely discharges and tire child embryo position location is accurate in the mould confined space, accomplish the secondary design of child embryo, and when finally making tire mould compound die accomplish, there is not the air to exist completely between whole mould surface and the tire child embryo, can not produce nest gas phenomenon. Therefore, the tire surface is free from any defects (air pocket, rubber fuzz and the like) caused by air under the condition of not processing air holes, and the production of the tire with zero rubber fuzz is realized.

While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.

Claims (9)

1. A mould for producing a non-rubber-fuzzed tire comprises a secondary steel ring, an upper side plate, an upper cover sealing plate, a T-shaped block, a middle die sleeve, a pattern block, a guide strip, an inclined plane antifriction plate, an arch-shaped seat, a bottom plate antifriction plate, a lower side plate, a lower steel ring, a lower chuck plate, an upper chuck plate, an ejector and a tire capsule; the pattern block structure is characterized in that a top sealing element is arranged between the upper cover and the upper cover sealing plate, an upper cover sealing element is arranged between the upper cover sealing plate and the middle mold sleeve, an upper cover upper sliding plate is arranged between the upper cover and the pattern block, a bottom plate sealing assembly is arranged on the bottom plate, a lower steel ring sealing element is arranged between the lower side plate and the lower steel ring, and an ejector sealing element is arranged between the ejector and the upper cover;

the bottom plate sealing assembly comprises an end face sealing element, a floating plate, a reset part, a positioning plate, a radial sealing element and a skirt plate; the skirt plate is fixedly sleeved outside the middle die sleeve, the reset component is pressed on the bottom plate, the floating plate is pressed on the reset component, the positioning plate is fixed on the bottom plate and sleeved outside the floating plate and the reset component, a radial sealing element is arranged between the positioning plate and the floating plate, the middle die sleeve can be inserted into the floating plate, the skirt plate can touch the floating plate, an end face sealing element is arranged between the floating plate and the skirt plate, a vacuumizing interface is arranged on the positioning plate, and a bottom plate sealing element is arranged between the positioning plate and the bottom plate.

2. The mold for producing a retreaded tire as recited in claim 1, wherein the top seal is a top seal ring.

3. The mold for producing a retreaded tire as recited in claim 1, wherein said upper cap seal is an upper cap seal ring.

4. The mold for producing a non-rubberized-burley tire according to claim 1, wherein said upper cover-up-slide plate is fitted over said upper side plate.

5. The mold for producing a retreaded tire as recited in claim 1, wherein said floor seal is a floor gasket.

6. The mold for producing a non-buffy coat tire according to claim 1, wherein said lower rim seal is a lower rim seal.

7. The mold for producing a green tire according to claim 1, wherein said ejector seal is an ejector seal ring.

8. The mold for producing a non-buffy coat tire according to claim 1, wherein said face seal is a face seal, said radial seal is a radial seal, and said restoring member is a coil spring.

9. The mold for producing a non-rubberized green tire according to any one of claims 1 to 8, wherein a fine adjustment pressing block that presses on the upper cover sealing plate and adjusts a gap between the upper cover and the upper cover sealing plate is provided between the upper cover and the upper cover sealing plate, and a fine adjustment pressing block that presses on the positioning plate and adjusts a gap between the positioning plate and the bottom plate is provided between the positioning plate and the bottom plate.

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