Guizhou Guiyang 55008 is a CllR formulation with a thickness of 25mm and monofilament nylon along the strip. The ratio of rim diameter to bead-to-bead diameter is 1.003 1.007. The tire sidewalls and shoulders of the finished tire should be vented. The main measure to solve the problem of nitriding in the tire during vulcanization is to increase the number of exhaust lines and the sprayer.
Tubeless tires have a good airtight performance and low heat generation. Therefore, the hot tire has the characteristics of low working temperature and long service life. The tubeless structure is the development trend of construction machinery tires. At present, the North American market basically uses tireless construction machinery tires. The market for domestic tubeless construction machinery tires is relatively small. The tires mainly use inner tube rims and tubeless tires. The key to production is the solution of the factory, and the key to questioning the inner tyres is the airtightness of the air.
1 The function of the village shaking to select the inner layer of the tire is to replace the inner tube, and it is required that the airtight layer rubber have high airtight properties and good heat aging resistance.
General use halogenated butyl rubber formula. Our company does not use inner liner rubber. The monofilament nylon is used along the strip. In the front row in 1997, 1401 nylon cords were used, and when the pressure was high, it was higher than 0.9.
2 Structural design 21 Bearing diameter and bead angle The seal of a tubeless tyre is mainly based on the fit of the bead ring diameter and the rim diameter interference and the toe angle. To improve the tightness of tubeless tires. The bevel angle of the bead toe can also be used in two angles relative to the fire in the corresponding part of the nozzle. In the tire toe 20, the left and right segment inclination is 25 times larger than the corresponding part of the rim, and the engagement diameter is 37 smaller than the diameter of the corresponding part of the rim, and the amount of interference is too large. Bell 1 Tire loading and unloading is not accurate, but tire tightness is difficult to guarantee.
The ratio of the diameter of the universal rim to the diameter of the tire's engagement is 1.003 1.007. If the diameter of the rim is large, it takes a large value; otherwise it is a small value.
22 Sealing line at the bottom of the bead The sealing line at the bottom of the bead plays a definite compensating role when the unevenness at the bottom of the bead is opposite to that at the bottom of the bead, but the thickness of the inner layer of the tire 23 is easily damaged when disassembling. The thickness of the inner liner is The tire's air pressure specifications are closely related to the air-permeability properties of the rubber compound. The thickness of the air-tight layer is 25-barrel. Higher-specification tires have thicker airtight layers; on the contrary, they are thinner.
24 Tire and shoulder vents Tubeless tires Although the airtight inner layers of the tire have good airtight properties, long-term operation under high internal pressure conditions, the gas penetration of the adhesive layer is unavoidable, therefore , Tubeless tire sidewall and shoulder vent hole diameter depth snoring cord is conducive to the air infiltration through the tire through the sidewall and shoulder vent holes to discharge the tire, so as not to cause tire use, side drum, And shoulder delamination.
3 molding to prevent the tire air through the tire toe end of the cord into the sidewall ply, the use of large turn around the molding method, that is = the final end of the curtain tube counter-hugging public airtight to declare the street corpse first layer of cloth Above. The diameter 4 of the tire-rolling section is not too large, so as to ensure that there are 2 left-side dense-layer divisions at the bottom of the tire vulcanized 1 bead, and the withdrawal of 4 sparse history 1 pearls, Teng Yong, 1 4 production problems and solutions Due to the tightness of the airtight layer, the air in the tire during vulcanization of the tire is not easy to be eliminated when the tire is vulcanized, resulting in a gas in the tire.
4.1 Measure of bead and fetal alveolar gas Toe and fetal alveolar anaesthesia measures are to copy the vent line at the bottom and side of the bead, the depth and width are lmm, and the interval distance is 40, 1 or so, 1.
1 vent hole circumference 36 equally perpendicular to the sidewall; 2 vent line circumference 36 equally divided, width 2, depth 3 vent line circumference 36 equal parts, width 2, depth 24 vent line circumference 36 equal parts, width and depth , 1; 5 exhaust hole diameter 2.5 centimeters circumference 36 equal parts; 6 exhaust line circumference 36 equal parts, width 1 with depth 5, ground; 7 exhaust hole diameter 2.5 melon circumference 20 equal parts; 8 circumferential exhaust groove Width 2 deep 2, 9 exhaust line circumference 36 equal parts, width 2 out of melon, depth 2, also 1 4.2 tires in the shoulder of the gas in the fetal shoulder gas solution to solve the problem when the use of water tire curing, increase the number of water tires Number of exhaust lines, and copy the flowers; when using capsules to cure, increase the number of capsule vents, and cut flowers, and at the same time to ensure that the pre-vulcanized green tire inside the capsule does not leak; curing stereotypes, appropriate Increase the setting time and the number of times; uniform coating agent in the tires; capsule surface coating Dow Corning release agent can play the role of lubrication and gas.
5 Conclusion Tubeless construction machinery tire innerliner compound formula and thickness is the key to ensure airtight performance. The selection of the material distribution and compression value of the bead diameter should be reasonable and appropriate. In addition, the finished product should be vented.
In the past, because the tires were vulcanized by the vulcanization tank, the use of iron rods to move the mold out of the tank, so labor-intensive, easy to cause damage to the appearance of the tire and mold pattern damage, affect the appearance of the tire quality, and mold repair costs are higher. The automatic mold opening rule is to set a cross on the center of the upper mold to form the center fulcrum, install the hanging hole in the center of the lower mold, and then use 30, long chain hooks to hang the upper and lower molds. After the tire is cured, the tank can be opened under the hydraulic cylinder. After pressing, the mold automatically falls off. The tires produced by this method have a smooth appearance and are easy to operate. The cost for rebuilding each vulcanization tank is only 30 yuan. At present, the automatic mold-opening method for tire vulcanization tanks has been promoted and applied by the company.
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