CN113370428A - Secondary vulcanization equipment for tire with annular groove and without using encapsulating sleeve - Google Patents

Abstract

A kind of secondary vulcanization equipment with tire of the annular groove without using the envelope, the tire used for both sides of the carcass extend out of the shoulder, the said shoulder forms the annular groove corresponding to annular tire tread inside, and the cushion gum locates at the bottom of said groove, including heating and pressurizing device and cushion gum sealing device, the said cushion gum sealing device is for hugging closely in the annular hoop body of the gap top between said inner wall of the groove and said annular tire tread, or imbed the annular lip sealing strip of Y type in the said gap, or set up in the annular lip of the side of the said annular tire tread, the said heating and pressurizing device includes: a vulcanizing tank and/or an annular clamping body with a heating device. The invention does not need to assemble accessories such as the packing sleeve and the like, can reduce the equipment investment and the expensive cost of replacing the accessories such as the packing sleeve and the like at regular intervals, reduces the loss of the packing sleeve and the use cost brought by the replacement, simultaneously saves the capital investment of related equipment and equipment, reduces the labor intensity and reduces the labor cost.

Description

Secondary vulcanization equipment for tire with annular groove and without using encapsulating sleeve

Technical Field

The invention relates to the field of manufacturing and retreading of tires, in particular to equipment for retreading a tire by adopting a secondary vulcanization process to produce the tire and a precuring tread process.

Background

With the continuous development of the automobile transportation industry, the holding capacity of transportation vehicles such as passenger cars and trucks is increasing, the using amount of tires used for trucks and passenger cars as vehicle consumables is increasing, and the sources of the tires mainly comprise new tires and retreaded tires. At present, in the process of producing a tire by adopting a secondary vulcanization method process and retreading the tire by adopting a precuring tread method process, the vulcanization of the tire can be completed only by adopting an encapsulating sleeve component, and the common characteristics of the processes are as follows: firstly, the outer surface (referred to as a tread bonding surface) of a prepared new tire body (without tread rubber and patterns) or an old tire body to be retreaded is polished and coated with buffer rubber, then the new tire body is laminated and molded with prefabricated tread rubber (the bonding surface of the new tire body is polished and coated with adhesive cement), and then an encapsulating sleeve is matched and is arranged in a vulcanizing tank for vulcanization. At present, the production of the above two products can adopt the following three vulcanization methods.

1. The outer surface of the tire to be vulcanized is provided with a special outer wrapping sleeve, a vulcanized inner tube is arranged in a tire cavity, clamping plates are arranged on two surfaces of the wrapping sleeve at the tire side, a rim strip, a special vulcanized rim and an adjusting washer are arranged at the tire bead, and then the rim is locked and the wall of the wrapping sleeve is compacted. The inner tube in the cavity is inflated first, and the envelope is clamped tightly therein by the expansion of the sidewall surface and the clamping plate, so as to seal the outer surface of the tire. Then the air in the encapsulating sleeve is extracted, and the vulcanizing tank can be put into the vulcanizing tank after the vacuum detection is determined to be qualified (the vulcanizing quality is prevented from being influenced because the gas in the vulcanizing tank enters the sealing cavity of the encapsulating sleeve). Then the pressure and heat of the hot air in the vulcanizing tank are transferred to the cushion rubber to be vulcanized by inflating and boosting the vulcanizing tank and heating, and the vulcanizing process is finished under the set vulcanizing process conditions (parameters include tank pressure, tire internal pressure, differential pressure of the tire internal pressure, vulcanizing temperature and time).

2. The inner surface and the outer surface of the tire are totally closed by assembling the inner wrapping sleeve and the outer wrapping sleeve, negative pressure is generated when air in the sleeve is extracted, the sealing position of the inner wrapping sleeve and the outer wrapping sleeve (the skirt edge of the outer sleeve is pressed on the flange of the inner sleeve) is further tightly attached, and the sealing effect is achieved. The following is the same as the vulcanization method 1.

3. The method is characterized in that a long skirt outer wrapping sleeve is adopted, an opening of the long skirt outer wrapping sleeve can extend to a tire bead (a meridian fixing port is defined, and the inner circle surface of the tire bead is specifically defined), a special tire bead ring clamp (adjustable clamping diameter) is selected and matched, the diameter of the special tire bead ring clamp is adjusted from small to large, and the wrapping sleeve can be tightly clamped on the tire bead (a matching surface with a wheel rim), so that the sealing effect is achieved. The following is the same as method 1.

The three methods are that the tire is wrapped in the wrapping sleeve and placed in the vulcanizing tank to complete vulcanization, different places are that the tooling clamps are selected to be different, but the tire to be vulcanized is isolated from the air medium in the vulcanizing tank (the inner surface and the outer surface of the tire are totally closed under the cooperation of the wrapping sleeve, the inner tube and the clamps, and the contact between the bonding surface and the medium is avoided), so that the pressure and the heat of the medium are transmitted to the buffer rubber, and the aim of vulcanization is fulfilled. Whether the secondary vulcanization process of a new tire or the precuring tread process of a retreaded tire adopts an envelope to carry out vulcanization, the problem that the comprehensive use cost is higher is that: special equipment and a clamp are required to assemble and disassemble the encapsulating sleeve, complicated manual operation is required, and the encapsulating sleeve is easy to damage accidentally; the encapsulating sleeve and the accessories are in a pressure-bearing hot air medium environment for a long time, and the service life is shortened by accelerating oxidation.

Disclosure of Invention

In order to solve the defects caused by the problem of the encapsulating sleeve in the prior art, the invention provides the tire vulcanizing equipment without the encapsulating sleeve.

The technical scheme of the invention is as follows:

the utility model provides a do not use encapsulation cover have tire's of annular groove's secondary vulcanization equipment, its characterized in that be used for the both sides limit of matrix respectively outwards extend the convex shoulder, the inside annular groove that forms corresponding annular tread of convex shoulder, and cushion gum is located the tire of groove bottom, including heating pressure device and cushion gum sealing device, cushion gum sealing device is for directly or indirectly hug closely in the annular hoop body at the gap top between the inner wall of groove and the annular tread, or imbed the annular lip sealing strip that the gap internal cross-section is the Y type, or set up in annular tread side and annular groove medial surface complex one or more annular lip, heating pressure device includes: a vulcanizing tank and/or an annular clamping body with a heating device.

Preferably, the annular hooping body is an annular component with an opening or a plurality of mutually combined annular components, the section of the annular component is U-shaped, the opening and the plurality of mutually combined annular components are spliced and locked through a connecting device, and the U-shaped bottom of the annular hooping body is directly or indirectly attached to and seals the gap through an inner surface curved surface formed after the U-shaped bottom of the annular hooping body is locked through the connecting device and an outer shape curved surface of the tire tread and the tire body annular groove edge.

Preferably, it is tight for gluing through being equipped with the sealed ring of gluing in the annular cramp and aerifing and make it paste tightly with child hat and tire shoulder contact surface, the sealed bottom surface both ends that the annular cramp body U type was arranged in at least to the sealed ring is sealed on the gap, the annular cramp body has the exhaust mouth of inflating on the anchor ring, the annular cramp body is sealed closely and sealed through the sealed intra-annular gas of gluing ring and sealed glue and tread matrix indirectly the cushion gum.

Preferably, the sealing rubber rings at two ends of the U-shaped bottom surface of the annular hooping body are internally provided with independent sealing air chambers respectively, and air charging and discharging ports are arranged at two sides of each sealing rubber ring.

It is further preferable that the sealing rubber rings at both ends of the U-shaped bottom surface of the annular clamping body are connected to each other along the inner surface of the annular clamping body, and the inflation/deflation port has a sealing means at a portion passing through the connection.

More preferably, the sealant ring is a heating sealant ring, and for example, a heating wire or a heating plate is provided.

Preferably, the indirect tight attaching is realized by arranging a rubber air bag in the annular tightening body and inflating the rubber air bag to enable the rubber air bag to be tightly attached to the contact surface of the tire crown and the tire shoulder in a sealing manner, and the rubber air bag is provided with an independent sealing cavity and an inflation and deflation port.

More preferably, the rubber bladder is a heated bladder, and is provided with a heater wire, a heater plate, or the like.

Preferably, the coupling device has a connecting, tensioning and opening function.

Further preferably, the coupling device is a locking buckle.

Further preferably, the coupling device is a pin.

Preferably, the tyre further comprises a special tyre bead seat positioned at the tyre bead of the tyre body, and the special tyre bead seat and the inner cavity of the tyre body form a sealing structure.

Preferably, the special bead seat is composed of two mutually nested cylindrical parts with staggered tooth shapes, one end of each part is the bead seat matched with the tire bead of the tire body, the other end of each part is of a tooth-shaped structure, one part is rotated and axially moved, the special bead seat can be quickly unlocked and disassembled, and the special bead seat is assembled on the other part. The tyre cavity is inflated and exhausted through an inflation and exhaust port arranged on the cylinder body

The invention has the following technical effects:

the vulcanization process of the raw rubber used by the tire is to match and control the elements according to the characteristics of rubber materials, and the cushion rubber can meet the requirements of a vulcanization system through proper pressure, temperature and time. The key to the curing of the cushion gum is to achieve a tight seal. After sealing, vulcanization pressure can be provided for the buffer rubber by external air pressure, and air is prevented from entering the buffer rubber.

The invention does not need an enclosing sleeve and a related clamp, so that the tyre body with the annular groove and the annular tyre surface can keep an independent sealing space of the cushion rubber needing to be vulcanized through the annular hooping body or the lip sealing device, and then the tyre can be inflated to raise the pressure in the vulcanizing tank or a special tyre bead seat of the device is added to inflate the pressure in the tyre cavity to act on the tyre body, and the force is transferred to the cushion rubber needing to be vulcanized to form the required vulcanizing pressure.

For the annular Y-shaped lip sealing strip, the lower end of the annular Y-shaped lip sealing strip is inserted into the gap, the Y-shaped opening can automatically tighten towards the middle along with the increase of the pressure of the gas below to exhaust, and the air in the gap between the tire body and the tire tread can be conveniently exhausted outwards. When air pressure exists above the tire during vulcanization, the two wings above the Y-shaped tire are compressed downwards, so that the sealing degree is increased along with the increase of the pressure, the sealing state of the cushion rubber is effectively maintained, and the annular lip on the side wall of the tire tread has the same principle.

Through the design, the invention can realize the vulcanization method which adopts the vulcanizing tank but does not use the packing sleeve. According to the type of the tire and the condition of the existing equipment, the tire vulcanization method of the annular clamping body can be realized by adopting different combinations of the following structures in combination with the cost and the difficulty of realizing the structure for clamping the annular clamping body.

1. Annular hoop body

The annular clamping body is used as a base part for sealing the gap, and the function of the annular clamping body is to form an outermost support structure at the periphery of the annular clamping structure. When the toroidal clamping structure exerts a pressure on the tyre to be vulcanised, it takes up all the reaction forces. The annular gripping body can be kept connected and tensioned by coupling means, such as locking snaps, providing a continuous gripping force and sealing the cushion gum during the vulcanization of the tire.

The structure of the annular hoop body is composed of an annular component or a plurality of partial annular components with an opening, and an annular structure with the inner surface curved surface closely attached to or equidistantly matched with the outer shape curved surfaces of the tire crown and the side wing parts is formed by the connecting device. The annular part of the annular hooping body can be used alone or combined with the inner layer part, and after the annular part is spliced by the connecting devices arranged at the two ends of the annular part, the annular part provides hooping force for the inner layer part or the tire crown part of the annular hooping structure.

2. Tread sealing rubber ring

The tread sealing rubber ring can be annular sealing rings which are tightly contacted with the tread and the annular tightening body respectively arranged on the two side surfaces of the tire body close to the tire shoulder part, and can also be connected with each other through a structure body close to the annular tightening body to form the tread sealing rubber ring with the C-shaped section.

3. Annular rubber air bag

The annular rubber air bag can be preferably adopted as one of the inner layer parts of the annular clamping structure, the rubber air bag is assembled between the annular clamping body and the tire to be vulcanized, the outer side of the rubber air bag is tightly contacted with the annular clamping body after being inflated, the inner side of the rubber air bag covers the surface of the tire tread and the surface of the side wing, and air pressure is applied to the tire tread and the tire shoulder under the support of the annular clamping body, so that the required vulcanization pressure is provided for the buffer rubber layer, and meanwhile, the rubber air bag also realizes the sealing of the gap.

As an auxiliary component in the vulcanization process, a special bead seat arranged in the middle of the tire to be vulcanized forms a supporting force on the inner wall of the tire body after being inflated, so that the rigidity of the tire body can be improved, and the stability of an external annular surface hooping structure is facilitated.

In the production process of the new tire adopting the precured tread and the tire body and the precured retreading process of the old tire, accessories such as the encapsulating sleeve and the like do not need to be assembled, so that the equipment investment and the expensive cost for periodically replacing the accessories such as the encapsulating sleeve and the like can be reduced, the loss of the encapsulating sleeve and the use cost brought by replacement are reduced, the capital investment of related equipment and equipment is saved, the labor intensity is reduced, and the labor cost is reduced.

Drawings

FIG. 1 is a schematic cross-sectional view of a coupling device according to embodiment 1;

FIG. 2 is a schematic sectional view of the coupling device according to embodiment 2;

FIG. 3 is a schematic sectional view of the coupling device according to embodiment 3;

FIG. 4 is a schematic sectional view of the coupling device according to embodiment 4;

FIG. 5 is a schematic sectional view of example 5;

FIG. 6 is an enlarged view taken at II in FIG. 5;

FIG. 7 is a schematic sectional view of example 6;

FIG. 8 is an enlarged view taken at III in FIG. 7;

FIG. 9 is a schematic view of a special bead seat according to example 7;

FIG. 10 is an enlarged view taken at I in FIG. 9;

FIG. 11 is a schematic cross-sectional view of the coupling device of the embodiment 8;

FIG. 12 is a schematic cross-sectional view of the coupling device of example 9.

1-tire body, 2-cushion rubber, 3-tire tread, 4-connecting device, 5-annular hooping body, 6-inflation and deflation port, 7-sealing rubber ring, 8-sealing air chamber, 9-shoulder, 10-rubber air bag, 11-gap, 12-Y-shaped annular lip sealing strip, 13-annular lip, 14-heating plate, 18-tire bead seat, 19-tooth-shaped structure and 20-tire bead seat sealing ring.

Detailed Description

In order that the invention may be better understood, the invention will now be further explained with reference to specific examples.

Example 1

As shown in fig. 1, the annular carcass 1 has an annular groove corresponding to the annular tread 3, the cushion gum 2 is located at the bottom of the groove, and the gap 11 between the inner wall of the groove and the annular tread is sealed by the annular clinch body 5.

The annular hooping body 5 is an annular part with an opening, the section of the annular part is U-shaped, the opening is spliced and locked through a connecting device 4 such as a locking buckle, and the U-shaped bottom of the annular hooping body forms an annular structure with an inner surface curved surface directly attached to the outer curved surfaces of the tire crown and the tire body side wing through the locking of the connecting device 4 to seal the gap 11.

And (4) vulcanizing and preparing the tire to be vulcanized in a vulcanizing tank by the locked structure according to the required vulcanization parameters.

Example 2

As shown in fig. 2, this embodiment is different from embodiment 1 in that the annular tightening body 5 is indirectly sealed and attached to the crown and the side wings by the sealant rings 7, the sealant rings 5 are disposed over the gaps at the two ends of the U-shaped bottom surface of the annular tightening body to seal the gaps 11, and the annular tightening body has the inflation/deflation ports 6 on the circumference. The sealant rings 5 at both ends are connected with each other along the inner surface of the annular tightening body 5, and the sealant ring inflation/deflation port 6 has a sealing means at a portion passing through the connection.

Example 3

As shown in fig. 3, the present embodiment is different from embodiment 2 in that there are independent air chambers 8 in the sealant ring 5, and each air chamber has an air charging and discharging port, so that the pressure and sealing effect can be further enhanced by the air charging.

Example 4

As shown in fig. 4, the present embodiment is different from embodiment 2 in that the rubber seal ring is replaced by a rubber bladder 7, and the annular tightening body 5 is indirectly sealed and attached to the tread and the carcass groove through the rubber bladder 7 to seal the gap 11.

Example 5

As shown in fig. 5 and 6, in this embodiment, the cushion rubber 2 is sealed by placing the Y-shaped annular lip sealing strip 12 with a Y-shaped cross section at the gap 11.

Example 6

As shown in fig. 7 and 8, in the present embodiment, one or more upward annular lips 13 disposed on the inner wall of the groove or the surface of the annular tread are disposed at the gap 11 to seal the cushion rubber 2.

Example 7

As shown in fig. 9 and 10, this embodiment is to add a special bead seat to the embodiments 1-6, the special bead seat is composed of two cylindrical parts nested with each other and meshed with each other through a castellated structure 19, one end of each part is a bead seat 18 matched with the tire bead of the tire body, the other end is the castellated structure 19, and the tire cavity can be inflated through an inflation and deflation port arranged on the cylindrical part. The special bead seat installed in the middle of the tire to be vulcanized forms a supporting force on the inner wall of the tire body after being inflated, so that the rigidity of the tire body can be improved, the stability of an external annular surface clamping structure is facilitated, and sealing is realized through the bead seat sealing ring 20 shown in fig. 9.

Example 8

As shown in fig. 11, example 8 is different from example 1 in that it comprises a heating plate 14, and the tire to be vulcanized is prepared by heating with the heating plate 14 and vulcanizing it with the required vulcanization parameters by the pressure of the structure after locking.

Example 9

As shown in fig. 12, example 9 is different from example 4 in that it comprises a heating plate 14, and the tire to be vulcanized is prepared by heating with the heating plate 14 and vulcanizing it with the required vulcanization parameters by the pressure of the structure after locking.

The above embodiment can basically maintain the existing vulcanization speed under the existing vulcanization parameter condition, and can partially realize the vulcanization effect even faster.

Claims (10)

1. The utility model provides a do not use encapsulation cover have tire's of annular groove's secondary vulcanization equipment, its characterized in that be used for the both sides limit of matrix respectively outwards extend the convex shoulder, the inside annular groove that forms corresponding annular tread of convex shoulder, and cushion gum is located the tire of groove bottom, including heating pressure device and cushion gum sealing device, cushion gum sealing device is for directly or indirectly hug closely in the annular hoop body at the gap top between the inner wall of groove and the annular tread, or imbed the annular lip sealing strip that the gap internal cross-section is the Y type, or set up in annular tread side and annular groove medial surface complex one or more annular lip, heating pressure device includes: a vulcanizing tank and/or an annular clamping body with a heating device.

2. The apparatus according to claim 1, wherein the annular tightening body is a U-shaped cross section having an opening or a plurality of mutually combined annular members, the opening and the plurality of mutually combined annular members are spliced and locked by the coupling device, and the U-shaped bottom of the annular tightening body is directly or indirectly tightly sealed against the gap by the inner curved surface formed by locking the U-shaped bottom of the coupling device and the outer curved surface of the annular groove edge of the tread and the carcass.

3. The apparatus of claim 2, wherein said indirect sealing is performed by placing and inflating sealant rings in said annular clamping body, said sealant rings being disposed at least at two ends of the U-shaped bottom surface of said annular clamping body to seal said gap above said gap, said annular clamping body having an inflation/deflation port on the circumferential surface thereof, said annular clamping body being adapted to indirectly seal against said tread casing and seal said cushion gum via the gas in said sealant rings and said sealant rings.

4. The apparatus as claimed in claim 3, wherein the sealing rubber rings at two ends of the U-shaped bottom surface of the annular hoop body are respectively provided with independent sealing air chambers, and air chamber charging and discharging ports are respectively arranged at two sides.

5. The apparatus according to claim 3, wherein said sealing rubber rings at both ends of the U-shaped bottom surface of the annular clamping body are connected to each other along the inner surface of the annular clamping body, and said air charging and discharging port has a sealing means at a portion passing through the connection.

6. The apparatus of claim 3 wherein said sealant ring is a heated sealant ring.

7. The apparatus of claim 2, wherein said indirect sealing is achieved by placing a rubber bladder in the annular clinching body and inflating the bladder to seal against the tread and shoulder interface, said bladder having a separate seal chamber and inflation and deflation ports.

8. The apparatus of claim 7 wherein said rubber bladder is a heated bladder.

9. The apparatus of any one of claims 1 to 8, further comprising a dedicated bead seat at the bead of the carcass, which forms a seal with the inner cavity of the carcass.

10. The apparatus according to claim 9, wherein said dedicated bead seat is composed of two nested cylindrical parts including staggered teeth, each part having one end thereof being a bead seat engaged with a tire bead of the carcass and the other end thereof having a tooth structure, and the tire cavity is inflated and deflated through an inflation/deflation port provided in the cylinder.

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