Do you know what the complex forklift tire model markings mean?

Complex forklift tire model marking, can you know what each number and letter mean?

Let's take 7.00-12/5.00 forklift tireas an example, which can be said to be the most common way of expressing forklift tyrespecifications. Let us explain to you what they mean from left to right

The first number 7 on the side represents the nominal section width of the tire, which is simply the width of the tire, in this case, the width is 7 inches;

The last two digits, 12, represent the inner diameter of the tire. In this example, the inner diameter is 12 inches. The inner diameter of the tire and the diameter of the rim need to be exactly the same;

The 5 at the end represents the rim width, which in this case is 5 inches wide. It is worth mentioning that the rim width is generally 2 inches narrower than the tire width.

The curious classmates will ask again, what does the dash between 7 and 12 mean?

Here are 3 ways of marking for annotation:

7.00-12/5.00, a standard high-elasticity solid tire dimensioning method;

7.00-12/14PR, the appearance of 14PR indicates that this is a pneumatic tire, and 14PR represents the number of layers of the tire;

7.00R12, where the letter R replaces the dash, indicating that this is a radial pneumatic tire.

After understanding the classification, do you know the characteristic differences between different tire categories?

Pneumatic tires have better driving comfort, support higher running speeds and have better shock absorption, but there is a risk of puncture;

Press-fit tires directly press-fit solid rubber on the iron ring. The biggest advantage is that it is economical and has no puncture risk, but it is only suitable for smooth working environments, and the shock absorption effect is poor;

High elastic solid tires are "assembled" products from three different rubber formulations, which can provide high service life, comfortable driving effect and zero puncture risk.

Come and come, learn and use now, take a test to see what the following series of numbers mean:

forklift tire 6.50-10 TT That's right, it's a 6.5" wide, 10" ID, Tube tire

Seven causes of abnormal wear of forklift tires

① Under certain load and driving conditions, the tire of the forklift truck has a suitable tire pressure. When the tire pressure is lower than the standard value, the radial deformation of the tire increases, and excessive deflection occurs on both sides, so that both sides of the tire crown are grounded , the inner wall of the sidewall is compressed, the outer wall of the sidewall is stretched, and the cord inside the carcass produces large deformation and alternating stress. Periodic compression deformation will speed up the fatigue damage of the cord, increase the relative slip between the ply of the tire and the tire and the ground, increase the heat generated by friction, increase the temperature of the tire sharply, and reduce the tensile strength of the rubber. , the cord is loose and partially delaminated, and a tire blowout occurs when an obstacle is impacted. The uneven pressure of the tread causes serious wear on the shoulder part, resulting in a "bridge effect", and the tread is toothed or wavy. The grooves of the tread pattern are easily embedded in the nails and stones of the road, causing mechanical damage. The rolling resistance of the carcass increases and the fuel consumption increases. The test shows: forklift rubber tire 6.00-9 TT 10PR When the tire pressure is lower than 20%-25% of the standard value, the fuel consumption will increase by 20% accordingly. When the tire pressure is higher than the standard value, the center of the tire crown is grounded, the contact area between the tire and the road surface is reduced, the load per unit area increases, and the wear of the center of the tire crown increases. The cord of the tire is overstretched, the stress of the carcass cord increases, and the fatigue process of the cord is accelerated, causing the cord to break, resulting in an early tire blowout.

② Under a certain load and tire pressure, the vehicle speed increases, the deformation frequency of the tire, the vibration of the carcass, and the circumferential and lateral twisting deformation of the tire (forming static waves) increase, and the heat generated by friction per unit time increases. The working performance of the tire decreases, and even the ply rupture and tread peeling occur, which accelerates the wear and damage of the tire.

③Under a certain tire pressure, the overload of the tire increases the deflection and deformation, and the stress of the cord and cord increases, which is easy to cause the cord at the sidewall to break, loosen and delaminate the cord, and the stress of the carcass cord will be reduced. Exceeding the design allowable stress and tire ground pressure, the heat generated increases, the carcass temperature increases, and the load carrying capacity decreases. At the same time, due to the wear of the tire shoulder and the ground, especially when encountering obstacles, even a small rock will cause the tire crown to burst. Practice has proved that in the case of turning and driving on uneven roads, the mileage of forklift rubber tyre 7.00-15 TT 14PR will be shortened by 35% when the tire load exceeds 20%; when it exceeds 50%, it will be shortened by 59%; when it exceeds 1 times, it will be shortened by 80% %above.

④The road condition also has a great influence on the service life of the tire, which affects the friction between the tire and the ground and the dynamic load on the tire.

⑤ High temperature will reduce the breaking strength, elongation and hardness of the rubber, reduce the adhesion strength between the rubber and the cord, and also accelerate the aging of the rubber. For tires at high temperature, especially those that have been aged, it is easy to tear the crown pattern when it slips or rolls over obstacles. Due to the aging of the sidewall rubber and the cracks and the severe deformation of the sidewall, the carcass layer cords are separated from the rubber. Once the tire locally encounters a sudden load, it is likely to have a puncture.

⑥ When the tire is corroded by grease, acid and alkali substances and high temperature for a long time, the physical and chemical properties of the tire will change, the bearing capacity will be greatly reduced, and the tire will be easily punctured during use. In addition, forklift tyre 23*10-12 TT 12PR tires corroded by oil will appear blocky peeling of the air seal layer, small area of rubber peeling off the tire mouth, and the carcass cord and rubber detachment and other phenomena. Since the patch is not compatible with the oil-containing rubber, even if the damage to the tire is small, the possibility of repairing is lost.

⑦Due to the different loads distributed by the front and rear axles, different working characteristics of the driving wheels and steering wheels, and different road conditions, the wear conditions of each tire are inconsistent. If the same factory, the same size, structure, level and pattern are not replaced on both sides of the same axle tires, it will accelerate tire wear.

⑧In use, if you do not pay attention to reasonable matching and regular rotation, the tires will bear uneven load, which will also accelerate tire wear.