Large off-the-road (OTR) tire prevulcanization retreading equipment and use method

Abstract

The invention relates to large off-the-road (OTR) tire prevulcanization retreading equipment and a use method. A ring with a hollow inner cavity is formed in a folded die of the equipment; and the inner cavity is matched with the tire tread and the tire shoulder of a tire and has a smooth cure surface without tread blocks. Two clamping disks comprise platens and central cylinders fixedly connected with the two platens which are provided with opposite through holes; the two central cylinders are respectively inserted in a rim-mounting hole in the center of the tire from upside to downside; thetwo platens are respectively pressed and covered on an upper tire bead and a lower tire bead of the tire; clamping bolts penetrate through the two platens and are fastened by nuts; and gas nozzles ofthe clamping disks are connected with an air compressor. The use method comprises the following steps of: pasting a prevulcanization tread adhesive on the tire; mounting the clamping disks to seal the inner cavity of the tire; mounting the tire; folding the die; and heating the vulcanization die while pressing the tire by the gas nozzles to finish retreading and vulcanizing. The invention only heats the top and the shoulder of a tire, avoids damaging the tread, enables the retrodden tire to resist abrasion, piercing and cutting and have stable appearance quality, does not need a rim, a package envelope and a tire tube and reduces consumption.

Description

(1) Technical field [0001] The invention relates to tire retreading technology, in particular to a large-scale engineering tire pre-vulcanization retreading equipment and a using method. (2) Background technology [0002] In recent years, with the rapid development of mining at home and abroad, the demand for large-scale engineering machinery tires has increased year by year, and the retreading of large-scale mechanical engineering tires has also become increasingly popular. Many companies and scientific research institutions have begun research in this area. [0003] At present, the relatively mature method of retreading large-scale engineering machinery tires mainly adopts the model method hot retreading. The main characteristics of this method are: simple process, product appearance close to new tires, and high dimensional accuracy of the product. However, the model method has the following disadvantages: 1. The mold needs to process pattern blocks, which has high process...

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Problems solved by technology

However, the model method has the following disadvantages: 1. The mold needs to process pattern blocks, which has high processing costs, and the same equipment can only vulcanize several specifications of tires of the same series, which increases the cost; The carcass undergoes two high-temperature vulcanization, and the carcass ages quickly, which seriously affects the service life of the retreaded tire; 3. The retreaded tire has poor wear resistance, cutting resistance and puncture resistance

[0004] It is well known that pre-vulcanized cold retreading can solve all the shortcomings of hot retreading, and the service life of tires is several times that of hot retreading. However, due to the huge size of large-scale engineering machinery tires, there are the following difficulties in the retreading of traditional encapsulation sleeve pre-vulcanization methods: 1. Currently there is no The envelope sleeve used for retreading of large-scale construction machinery tires, specially made envelope sleeves for this purpose will inevitably increase the cost; and there is also the problem of envelope wear and tear, and the cost will increase significantly; 2. Due to the thick tread of large-scale construction machinery tires, envelopes are used The pressure applied to the tread is limited, and the product has quality risks; 3. Even if it is made into a special envelope, it is extremely difficult to enclose the large tire

Therefore, there have been no relevant reports on large-scale OTR tires being refurbished by pre-vulcanization with encapsulation sleeves.

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