Safty Management and Using Instructions of Giant OTR Tyres

Tires are one of the most important parts of a car, just like the feet of a car. In mine transportation, in terms of transportation cost, the cost of tire consumption accounts for a large proportion, accounting for 20% to 30% of the cost of production and transportation. The fixed cost of tires increases with the increase of truck tonnage. The price of mining car tires is also higher, which accounts for 7% to 10% of the cost of the entire vehicle. Therefore, the correct use of tires can not only extend the service life of the tires, but also have important significance for ensuring driving safety and reducing transportation costs.

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Large truck tires: Currently available in China:

53/80R63 (for KOMATSU930E, etc.)

4000R57 (for KOMATSU830E, etc.)

3700R57 (for KOMATSU730E, CAT789, etc.) (previously known as the first child in China)

3600R51 (for 630E, etc.)

3300R51 (for 128-ton trucks)

3000R51 (for 108 tonnage trucks)

27OOR49 (for 77-ton trucks)

2400R35 (for 65 tonnage trucks)

2100R35 (for 30-ton trucks)

Construction machinery and equipment tires: Currently available in China:

45/65R45 (for CAT992KOMATSUWA800)

35/65R35 (for CAT834KOMATSUWA600)

Giant tire composition and performance, role, classification

Tire composition and performance:

The tire has four main parts: ply, bead, cushion layer and tread. The performance of the tire basically depends on these four parts.

The role of the tire:

(1) to withstand the quality of the car itself and the load, to maintain its performance

(2) Buffering the shock and vibration received by the vehicle to maintain the stability and smoothness of the vehicle.

(3) Ensure that the entire tire is reliably in contact with the ground to improve the traction, passability and braking of the vehicle.

Tire classification:

Bias tire (BIASTIRE)

A tire structure that has been used since a long time ago refers to a tire that constitutes a cord of the carcass at an angle (about 38 degrees) to the direction of travel of the tire.

Radial tire (RADIALTIRE)

A structure in which the arrangement of the carcass cords is 90 degrees or nearly 90 degrees with respect to the traveling direction of the tire, and the belt is used to increase the strength of the tire.

Compared with bias tires, radial tires have the following characteristics:

Good steering stability, full cornering performance, good wear resistance, low heat generation, low rolling resistance, fuel cost savings, strong traction, less slippage, and good ride comfort at high speeds.

Tire with inner tube (TUBETYPETIRE)

Tyre inside the tire and inflated

Composition: tire + inner tube + pad + rim

Correct use management method:

Choose a suitable inner tube, and the new tire must use a new inner tube.

- Radial tires should use inner tubes for radial tires.

If there is no air pressure, if the inner tube width is deformed by more than 10%, it cannot be used continuously.

When you first start to inflate, you should first make the inner tube and the pad with the low pressure, and then fill it with the appropriate air pressure.

Tubeless tire (TUBELESSTIRE)

The inner tube is not used, and a special rubber (airtight layer) in place of the inner tube is used on the inner surface of the tire to ensure the tire airtight performance.

Composition: tire (inner seal) + rim

During the running of the tubeless tire, even if there is a foreign object such as a nail, the air pressure will not decrease quickly.

Summer tires (SUMMERTIRE)

This kind of tire is used for spring, summer and autumn with temperatures above 0°. In order to be able to display excellent maneuverability and braking performance on wet and dry roads, it is required to have a large contact area with the ground to increase the friction between the tire and the ground. Therefore, a simple block pattern is often used in the tread design to increase the contact surface with the ground. Moreover, in order to enhance the drainage performance on a wet road surface, the grooves are mostly linear in the circumferential direction. Tires that do not have special seasonal signs are summer tires.

All-day tires (ALLSEASONTIRE)

This type of tire combines the characteristics of snow tires and summer tires, and its pattern is more complicated than summer tires. In order to be able to exert superior braking and handling performance on snow, snow tires have more fine grooves than summer tires, but all-weather tires cannot perform braking performance 100% on low temperature and snow surfaces, so It is safer to use special snow tires in the area.

Snow tires (SNOWTIREorWINTER)

Tires used exclusively in low temperature and snow conditions in winter. The tread is designed as a block with many small grooves, and in order to show excellent braking and handling performance in winter, the grooves are usually deep and wide. Tread rubber is a special formulation that is resistant to low temperatures and maintains its softness and good friction even at low temperatures. Studded tires were developed to improve braking and handling on the ice, but since 1987, studless snow tires are gradually replacing studded tires because of their superior performance, because studded tires are very Great noise and air pollution. Recently, with the development of tire technology and raw materials, the performance of the nailless snow tires on the ice has been greatly improved.

Tire assembly notes:

1. The tires must be assembled on the specified models and rims. Special tools and instruments should be used to install and disassemble the tires. Hard and hard smashing is strictly prohibited.

2, the same axle, should be equipped with the same brand, specifications, structure, pattern and level of tires

3, bias tires and radial tires can not be mixed.

4. When assembling the directional tire, the direction of rotation of the tire should be consistent with the direction of travel of the vehicle.

5. When the construction machinery tires are assembled, the range of the outer diameter difference of the twin tires should meet the following requirements.

When the construction machinery tires are assembled with two tires, the outer diameter of the two tires is allowed to differ:

6, disassembly and assembly of tubeless tires

(1) Before loading the tire, check the rim for deformation and cracks. If there is any problem, repair or replace the rim. The tires should be removed from the rim surface and the rust and other debris of the bead lower seat and the O-ring groove.

(2) Where a tire with an O-ring rim is removed, a lock ring is required.

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Giant tire technology and management

Truck tire technology and safety management

Abstract: According to the particularity of truck tires and engineering equipment tires, the composition and structure of truck tires and engineering tires are analyzed, and the rational use and safety management methods of truck tires and engineering tires are proposed.

1 Overview

Tires are one of the most important parts of a car, just like a pair of cars. In mine transportation, in terms of transportation cost, the cost of tire consumption accounts for a large proportion, accounting for 20% to 30% of the cost of production and transportation. The fixed cost of tires increases with the increase of truck tonnage. The price of mining car tires is also higher, which accounts for 7% to 10% of the cost of the entire vehicle. Therefore, the correct use of tires can not only extend the service life of the tires, but also have important significance for ensuring driving safety and reducing transportation costs.

2. Classification of engineering tires and types of applicable vehicles

2.1 Classification of engineering tires

(1) According to the structure of the tire, it is divided into two types: inner tube and tubeless tube.

(2) According to the air pressure of the tire, it is divided into two types: high pressure tire and low pressure.

(3) According to the carcass structure, it is divided into two types: bias tires and radial tires. In the bias tire, the cord direction of the carcass is at an angle of 35° to the center line (circumferential direction) of the tire. Radial tire, the cord direction of the carcass is 90° to the centerline direction of the tire. This distribution of the cord is very similar to the meridian on the earth, so it is called a radial tire.

(4) According to the tread pattern, it is divided into ordinary pattern tires, mixed pattern tires and cross-country pattern tires.

2.2 Types of applicable vehicles

Vehicle Type

use

Vehicle name

Required characteristics

Transportation machinery

Earth gravel rock, coal, etc.

truck

Heat resistance and wear resistance

Anti-shock fever

Flat road machinery

Leveling, flat road

Leveling machine

Ground adhesion, operational sensitivity (straight driving stability)

Loading and dozing machinery

Loading and bulldozing

Loader bulldozer

Resistance to cracking and wear resistance

Rolling machinery

Compaction

roller

Oil resistance, crack resistance, wear resistance

3 Reasonable use of tires

3.1 Control the temperature of the tire

The temperature of the tires is extremely important for mining vehicles. Due to the load, the sidewall is stretched and compressed, and the flexure and extension between the cords inside the carcass, the friction between the tread and the road surface, and frequent braking when driving downhill, cause the tire temperature to rise. The increase of the tire temperature has a great influence on the service life of the tire. It can promote the aging of the rubber to crack, reduce its physical function, and produce separation between the layers of the ply, shortening the service life.

In order to prevent the tire from being used at a higher temperature, causing early damage to the tire, foreign tire manufacturers have established a method of selecting the tire according to the conditions of use and the TKPH value of the tire. The TKPH value of the tire is an indicator that reflects the relationship between the factors causing the temperature rise of the tire, and indicates the heat generation limit of the tire, which is used to limit the working condition of the tire. The purpose is to make the tires do not appear high temperature during use to extend the service life; the load on the tire is used, and the driving speed is limited to the range of the working ability of the tire. Therefore, each type of tire has a defined load speed limit, the TKPH value. As long as the tire is selected according to the TKPH value, the service life can be effectively extended.

3.2 standard inflation pressure

Inflating without the standard air pressure specified by the tire is one of the main causes of early wear and damage of the tire. The tire pressure is affected by the tire's service life.

(1) When the tire is used under low air pressure, its radial deformation causes a large deformation stress and deformation of the cord in the tire body, which accelerates the fatigue damage of the cord. When the air pressure rolls, it will cause a sharp rise in the tire temperature, and the relative sliding between the tire and the ground will increase. The heat generated by the friction will increase, and the tire temperature will increase, which will cause partial delamination of the tire and slack of the cord. When the air pressure is too low, the contact area between the tire and the ground is increased to lower the contact pressure, and the shoulder wear is large, and the tread wear is small. The tread pattern recess is most likely to be inserted into the stone under low air pressure, causing mechanical damage.

(2) If the tire pressure is too high, the cord of the tire will be excessively stretched, which will accelerate the fatigue process of the cord. As the use time is extended, the cord will be broken and cause early damage. When the obstacle is encountered, the carcass is explosive. When the air pressure is too high, the grounding area of the tire becomes smaller, the tread pressure at the grounding portion increases, and the wear in the middle portion of the tread is accelerated.

4. Scientific management of tires

Reasonable and correct management and use of tires, timely maintenance and repair of tires, maximizing the service life of tires, reducing transportation costs and improving economic efficiency of enterprises are of great significance.

4.1 Management of tires

(1) Equipped with professionals to improve various management systems. The assembly, disassembly, repair and maintenance of tires is a relatively professional job, and it is also a high-risk type of work. Therefore, personnel engaged in tire repair must be professionally trained, and personnel with certain maintenance techniques can perform tire repair operations.

(2) Acceptance and storage of tires. After the tire arrives at the scene, it is necessary to designate a special person to carry out inspection and acceptance to ensure that the quality of each new tire meets the requirements. The storage of the tires is critical to ensure the quality of the tires. If the tires are exposed to the outside for a long time, the rubber of the tires will age rapidly and the service life of the tires will be greatly reduced. Therefore, the tires should be stored according to the following requirements to ensure the service life of the tires: 1 Keep the new tires in a cool, dry place indoors, covered with tarpaulin. 2 Keep away from electrical equipment. 3 Do not put the same room or adjacent room with oil such as gasoline. 4 can not be stacked into a stack, stored vertically.

(3) Establish a tire card. Each truck must have a corresponding tire file and tire card to make detailed and accurate tire tracking records, and the running time or running kilometers of each used or dismounted tire must be mastered in detail.

(4) Assessment of tires. In order to strengthen the driver's operational level and sense of responsibility, the operating driver is given a reasonable tire use reward and punishment system, and the tire award is used to promote the driver's awareness of protecting the tire.

(5) Strengthen the maintenance of roads. The quality of the road directly affects the service life of the tire. First of all, the indicators of mine roads must meet the prescribed standards, the angle of the ramp, the curvature of the turning, the arching degree of the road surface, and so on. Then there is the investment in road maintenance equipment to strengthen the responsibility of the driver of the grader and the rubber wheel bulldozer. It is especially important to maintain the parking space (shovel) and the maintenance of the dump site.

4.2 Maintenance of tires

(1) Grasp the routine maintenance, air pressure test, etc. Check the appearance of the tire daily and find that the small stone is taken in time to remove it; avoid the stone from sticking or causing partial cut and peeling; keep the standard pressure value of the tire in cold condition.

(2) Adjustment of the toe. The normality of the front of the truck is important. If the front beam is not normal, it will cause partial sharp wear of the two front wheels. The so-called front beam is not normal, that is, the two front wheels are not parallel, that is, the shape of the eight characters and the outer eight characters in the front wheel that people often say. The consequence of this is that the tires are eccentric and the tires are scrapped in advance. Therefore, it is necessary to frequently test the depth of the pattern on both sides of the two front tires, and find that the wear is abnormal, and adjust the toe in time.

(3) Transposition of tires. Use the tires to give full play to the value of each tire. After the tires are used for a certain period of time, they must be properly transposed to make the tread evenly worn. In the mine, especially the front wheel shift is more important and involves safety. Generally, the front wheel pattern can be changed after using about 40% of the new tire. The height difference between the two old tires assembled on the rear wheel should not exceed 15mm, and the tires of the same manufacturer should be assembled together.

5. Safety precautions for tire use

A tire filled with gas at a specified pressure is equivalent to a high-pressure vessel. If a sudden release of gas is caused, an explosion will occur, which may cause damage to equipment or personnel. Therefore, when repairing the tires, strictly follow the tire maintenance safety operation procedures, and strictly observe the following safety precautions.

(1) Personnel performing tire repairs must undergo professional pre-job training, and they can be employed after they have passed the training.

(2) There must be 2 or more people in the tire repair to carry out the work.

(3) Appropriate labor protection articles must be worn when performing tire repairs.

(4) When carrying out tire repair work, it should be carried out in the divided safe working area, the site is smooth and stable, and away from the elevated line and vehicle pedestrians.

(5) The vehicle for tire repair must be completely unloaded, notify the driver to brake, turn off the fire, and start work after listing.

(6) When handling twin-tire stones, the twins must be deflated before being disposed of.

(7) When replacing the cracked retaining ring or rim, even the inner tire must be deflated.

(8) When installing the repaired tire, the tire patch is not allowed to be installed on the outer side of the tire, and one side cannot be installed at the same time.

(9) The two tires assembled on the rear wheel must be the same manufacturer and the same type of tire.

Conclusion: At present, the price of tires is gradually rising. The supply of giant tires is relatively tight, and there are accidents during the repair of tires. This requires us to use and manage tires scientifically and rationally, and to maximize the use of each tire. Life expectancy, guarantee the smooth completion of various production tasks, and create better economic efficiency for enterprises


Artikelklassifizierung: 轮胎知识
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