CN209955672U - Retreaded tire - Google Patents

Abstract

The utility model relates to a retreaded tire, which comprises a tire body, wherein the part of the tire body contacting a steel ring is a side edge, and the tread of the tire body is provided with patterns; the tire body is circumferentially provided with joints in end-to-end butt joint, and after the tire body is unfolded, acute angles formed by two adjacent sides of the joint are 30-45 degrees. The utility model discloses a cut to one side and increase the joint butt joint adhesion area, increase stretch-proofing performance.

Description

Retreaded tire

Technical Field

The utility model relates to a tire production field, in particular to method and retreaded tire of tire retreading.

Background

In the traditional tread rubber butt joint process, the tread is directly cut according to the butt joint length, and joints are vertically butted. The butt joint area of the joint is small due to the direct cutting, and the tensile resistance is poor; in the process of tread pasting, the tire has a certain stretching; particularly, in the case of a tread having a small tread thickness, the reliability of the abutment cannot be ensured. Finally, the situation that the joint is cracked frequently occurs in the process of loading the tire into a vehicle and using the tire. The cracking is intensified by repeated ground-holding friction in the tire, and finally, delamination, tread chipping or falling-off occurs. At this point, the tire is unloaded for a secondary treatment. On one hand, the use cost of the tire is increased, and waste is caused; on the other hand, the running efficiency of the vehicle is influenced, potential safety hazards exist under severe conditions, and the safety of driving and pedestrians is threatened. Secondly, the heating temperature of the traditional process is 115-120 ℃, the high temperature can cause secondary damage to the tire body rubber, and the aging of the tire body rubber is accelerated due to the high temperature, so that the service life of the tire is shortened.

Disclosure of Invention

The utility model aims at overcoming the defect that prior art exists, providing one kind through the mitre increase joint butt joint adhesion area, increase stretch-proofing performance, reduce the later stage and use a method and retreaded tire of retreading of the condition of fracture.

Realize the utility model discloses the technical scheme of purpose is: a retreaded tire comprises a tire body, wherein the part of the tire body contacting a steel rim is a rim, and the tread of the tire body is provided with a pattern; the tire body is circumferentially provided with joints in end-to-end butt joint, and after the tire body is unfolded, acute angles formed by two adjacent sides of the joint are 30-45 degrees.

According to the technical scheme, the section of the joint is an inclined plane.

According to the technical scheme, the inclined plane at one end of the joint is provided with the grooves which are uniformly distributed, and the inclined plane at the other end of the joint is provided with the bulges matched with the grooves.

According to the technical scheme, the end parts of the inclined planes of the joints are in a sawtooth shape and are arranged in a staggered mode.

According to the technical scheme, the included angle between the inclined plane and the horizontal direction is 30-60 degrees.

After the technical scheme is adopted, the utility model discloses following positive effect has: the utility model discloses a cut to one side butt joint technology has solved traditional joint and has cut directly to butt joint defect, and cut to one side technological requirement adopts cut to one side frock and cut-off knife when prevulcanization tread rubber docks, increases and connects the butt joint adhesion area, increases the stretch-proofing performance, solves the later stage and uses the condition of fracture.

Drawings

In order that the present invention may be more readily and clearly understood, the following detailed description of the present invention is given in conjunction with the accompanying drawings, in which

FIG. 1 is a flow chart of the retreading process of the present invention;

fig. 2 is a schematic structural view of the tire of the present invention;

fig. 3 is a first schematic view of a joint structure of a tire according to the present invention;

FIG. 4 is a schematic view of a joint structure of a tire of the present invention;

fig. 5 is a schematic view of a joint structure of the tire of the present invention;

FIG. 6 is a partially expanded schematic view of a tire body according to the present invention;

Detailed Description

(example 1)

Referring to fig. 2 to 6, a retreaded tire comprises a tire body, wherein the part of the tire body contacting a steel rim is a rim, and the tread of the tire body is provided with a pattern; the tire body is circumferentially provided with joints 1 in end-to-end butt joint, and after the tire body is unfolded, acute angles formed by two adjacent sides of the joint positions are 30-45 degrees.

The cross section of the joint 1 is a bevel 2. The inclined plane of one end of the joint 1 is provided with evenly distributed grooves 4, and the inclined plane of the other end is provided with protrusions 3 matched with the grooves 4.

The end parts of the inclined planes 2 of the joints 1 are all in a sawtooth shape 5 and are arranged in a staggered way.

The included angle between the inclined plane 2 and the horizontal direction is 30-60 degrees.

Referring to fig. 1, the present invention relates to a method for retreading a tire, comprising the following steps:

(1) and initial inspection: selecting a retreadable qualified tire body meeting the tire retreading standard by checking the tire crown, the tire shoulder, the tire side, the tire bead and the tire liner of the tire, and cleaning the tire body;

(2) and large grinding: setting polishing parameters by using a full-automatic five-axis linkage polishing machine, and polishing to obtain a polishing roughness of between RAM3 and 5;

(3) and (3) gluing the upper middle cushion: placing the tire into a middle cushion rubber extruder for inflation, heating and extruding middle cushion rubber at the heating temperature of 80 ℃ by utilizing the screw extrusion principle, extruding the tire at a high pressure at a discharge port of the extruder, adhering the heated middle cushion rubber to the surface of the tire crown coated with tread base rubber at a high pressure while rotating, wherein the adhesive thickness of the middle cushion rubber is 1.5-2 mm;

(4) and tire tread fitting: sticking the pre-vulcanized tread rubber on the surface of a tire according to the corresponding size, and pressing after obliquely cutting a joint and splicing the head and the tail;

(5) and an upper encapsulating sleeve: the molded retreaded tire is put into a flexible inner and outer encapsulating sleeve with vulcanization grains inside, and then the inner and outer encapsulating sleeve is vacuumized to be tightly attached to the surface of the tire;

(6) and vulcanizing: the tire with the surface tightly attached to the inner and outer encapsulating sleeves is vulcanized, the vulcanizing tank adopts a differential pressure vulcanizing mode, the vulcanizing tank detects and adjusts the pressure of each part constantly, and the pressure is kept stable at any time.

The step (1) comprises the following steps: A. manual inspection items:

checking a crown: blasting, pricking, delaminating;

checking a tire shoulder: delaminating;

and (3) checking the tire side: aging, cracking, contamination, cutting;

bead checking: cutting, delamination, deformation;

checking the fetal lining: grinding, breaking and nailing holes;

B. equipment inspection items:

holographic inspection: detecting whether the inner part of the tire has bulging or void by using a laser speckle inspection machine;

and (3) nail hole inspection: the method comprises the following steps of (1) utilizing an NDT (non-destructive testing) inspection machine to inspect whether the tire is punctured through by a high-voltage discharge principle;

high-pressure inspection: the tire is inflated at high pressure by using a high-pressure inspection machine, and the strength of the tire body of the tire is inspected.

The polishing parameters in the step (2) are as follows:

sanding reserve thickness, i.e. base glue to wire layer thickness: 1.5-2 mm;

and (3) polishing radian: 500-800 mm;

chamfering angle: 30-50 degrees;

chamfer radius: 2-3 mm;

the polishing height of the sidewall is 100-200 mm;

feed amount: 1-3 mm.

The bias cutting process in the step (4) comprises the following specific steps:

① reserving butt joints according to the actual circumference of the ground tire, cutting the strip-shaped pre-vulcanized tread rubber by using a corresponding tool, wherein the section presents an inclined plane with a set angle with the horizontal plane, and performing the same treatment on the two butt joints;

② cutting, and processing the cross section with a soft steel wire brush, wherein on one hand, the rubber powder of the cross section is processed, and on the other hand, the cross section has a certain roughness;

brushing a layer of adhesive cement on the upper and lower sections, naturally standing for 2-3 minutes, then sticking a middle cushion adhesive tape, butting and compacting the joints, and transversely fixing by using a pneumatic setting nail gun;

④ and for the shoulder chamfer area, a high-strength rubber sheet with corresponding width is circumferentially stuck for covering and connecting the joint seal of the tread and the tire body.

The tool is provided with a tread clamping device; the upper surface and the lower surface of the tread clamping device are set to form a slope of 30 degrees with the horizontal plane, and are transversely provided with sliding grooves for stepping on a knife; after the clamping device is fixed, starting the cut-off knife; the cutter advances horizontally to cut the tread.

The vulcanization time in the step (6) is 3.5 hours, the vulcanization temperature is 99 ℃, and the pressure of a vulcanizing tank, namely external pressure is 6 Kg/c square meter, and the pressure of a tire, namely internal pressure is 8.0 Kg/c square meter; DPC pressure is 4.8 Kg/c square meter.

The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (5)

1. A retreaded tire comprises a tire body, wherein the part of the tire body contacting a steel rim is a rim, and the tread of the tire body is provided with a pattern; the method is characterized in that: the tire body is circumferentially provided with joints in end-to-end butt joint, and after the tire body is unfolded, acute angles formed by two adjacent sides of the joint are 30-45 degrees.

2. The retreaded tire of claim 1, wherein: the section of the joint is an inclined plane.

3. The retreaded tire as recited in claim 1 or 2, wherein: the inclined plane of one end of the joint is provided with uniformly distributed grooves, and the inclined plane of the other end of the joint is provided with bulges matched with the grooves.

4. The retreaded tire as recited in claim 1 or 2, wherein; the end parts of the inclined planes of the joints are in a sawtooth shape and are arranged in a staggered mode.

5. The retreaded tire of claim 2, wherein; the inclined plane is 30 ~ 60 with the contained angle of horizontal direction.

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