The tire is one of the important parts of a car, just like the feet of a car. In mining transportation, the cost of tire consumption accounts for a large proportion of its transportation costs, accounting for about 20% to 30% of the production and transportation costs. The fixed cost of tires also increases with the increase in the heavy tonnage of trucks. The price of mining vehicle tires is also higher, which accounts for 7% to 10% of the cost of the vehicle. Therefore, the correct use of tires can not only extend the service life of tires, but also has important significance for ensuring driving safety and reducing transportation costs.
Tire composition and performance: Truck Parts,Truck Wheel,Diesel Filter, Machine Filter, Air Filter,Gear Box Zhengzhou Dongfeng Mid-south Enterprise Co., Ltd. , https://www.cn-dfmtruck.com
The tire consists of four main parts: ply, bead, buffer layer and tread. The performance of the tire basically depends on these four parts.
The role of tires
(1) Withstand the quality of the car itself and the load, and maintain its running performance
(2) Buffer the shock and vibration received by the vehicle while maintaining the stability and smoothness of the vehicle.
(3) Ensure that the entire tire is in reliable contact with the ground, and improve the traction, passing and braking performance of the vehicle
Tire classification
Bias tire and radial tire
Analysis of Five Bad Phenomena in LED Panel Light Market
The LED panel light embodies the lighting application that sees no light and reaches the high level. It has the advantages of uniform light distribution, soft and comfortable, clean and bright, and has the advantages of anti-mosquito, anti-fog and anti-fog. It has a simple shape and is easy to integrate with the ceiling module. Therefore, the integrated ceiling is especially complicated and the space is more complicated. The small kitchen sector has great application advantages. At the same time, LED panel lights have low power consumption, energy saving and environmental protection, long life, economical use; technology and fashion, application convenience and many other characteristics, deeply loved by modern consumers. However, due to the lack of standards for LED panel lights, the core technology is missing, and some speculators are rushing in. There is no technology, no research and development, no quality control, no bottom limit in the industry, a table, two screwdrivers, Three or four people, a large number of crude craft factories. In the market, there are a large number of LED panel lights with extremely short life, poor light color and light leakage, and even electric leakage accidents, resulting in continuous complaints from users. There is no door for dealers after sale, which greatly impacts the market's confidence in LED panel lights. Healthy development of the industry. Here, let us dissect the bad phenomenon of the LED panel light in the current market from a technical point of view. First, let us analyze the current LED light source device used in LED panel light because of its small size, suitable power, high light efficiency, easy to control light and heat dissipation. The current LED panel light mainly uses SMD4014 lamp beads. We have thoroughly tested LED lamp beads used in multi-layer factories in the industry, such as the one on the right. Inferior products in the industry are often inferior quality beads with low price, the chip is small (the advantage of 4014 lamp bead chip size is 10*30, while the low quality lamp bead chip size is below 10*23), the light output is low; at the same time its package Colloids and phosphors are inexpensive, and use copper wire with low melting point (gold wire for quality lamp beads), iron bracket (composite material with high quality thermal conductivity for lamp beads), which makes it easy to use. Burn the dead light. Second, we will analyze the same as the core component of the drive power. Because the LED lamp bead is a low-voltage start-up semiconductor device, the most basic requirement is to use a matched low-voltage power supply, and requires a constant constant current (current is too high in the presence of light) Fast decay, the light is very dark or even burned when the time is long.) At present, LED driver power supply mainly has three technical solutions: 1. Resistor-capacitance and buck: the scheme is simple, the device is small, the cost is low, and the constant current is not constant. Mainly used 3W and below LED lamp configuration, and there is danger of leakage caused by breakdown of the lamp board, so the structural shell of the lamp body must be insulated; 2. Non-isolated power supply: moderate cost, IC constant current, but also there is breakdown lamp board The danger of electric leakage is caused, and therefore the structural outer casing of the lamp body must be insulated. 3, isolated power: high cost, IC constant current, good security. In order to achieve better light extraction efficiency, the LED panel lamp generally has a slender strip structure. Therefore, in order to ensure the heat dissipation of the LED lamp, an all-aluminum structure is used as a cavity and as a heat sink. For the non-insulation of the aluminum lamp body, it is necessary to use an isolated power supply to provide basic safety protection, and at the same time provide a constant and constant current to ensure the long life of the lamp bead. At present, there is no bottom line product in the industry, which is used for cutting corners. It is also used to prevent and reduce voltage. It also uses non-isolated constant current power. In order to cover the market, it also uses inferior colloids. It is famous for its moisture-proof and waterproof, but it is afraid of inferiority. The drive scheme is dew. At the same time, the same is the isolated constant current power supply, there are also advantages and disadvantages such as whether the solution is reasonable, the configuration is complete, the device is stable, the circuit is scientific, and the process is rigorous. Here, only the circuit board that everyone can understand, the inferior drive uses the paper core board, which is easy to absorb moisture. In the process of use, it is easy to cause short circuit burnout; and the high quality drive adopts fiberglass board and has stable line. The advantage of moisture resistance and durability. In the process, the high-quality drive of the standard manufacturer adopts automatic patching and automatic wave soldering, no confusion, no virtual welding, which is unsatisfactory for the workshop process of inferior products. Third, the overall matching and process anatomy of LED panel lights From a technical point of view, LED panel lights are essentially electronic and electrical products, in addition to the choice of materials and devices, professional and rigorous R & D design, experimental verification, raw product control, aging System testing and other measures can ensure product qualification and stability. 1. The first is the reasonable matching design of the lamp bead and the power supply. If the configuration is improper, or the current or voltage is too high, it is easy to burn the LED lamp bead; or exceed the power load, the temperature rises during use, the lamp bead strobes or even the power supply burns; the match between the lamp bead and the power supply needs to be fully understood and Completed by experienced electronics engineers in cognitive LED and electronics. 2, then the heat dissipation structure design. LED lamp beads will have a considerable amount of heat during use. If the heat is not dissipated in time, the LED lamp bead temperature will be too high, which will accelerate the decay and aging of the LED lamp beads, and even dead lights. 3. Again, the structure is coordinated. LED lamp beads are used as electronic devices and are also illuminants. They need to be rigorously designed in terms of device protection, light control and light guiding, and equipped with precise production technology to ensure the realization of the design. At present, the industry is generally inferior parts that have not been professionally designed. Workshop manufacturers like to buy cabbage on the roadside shops, such structural parts can easily lead to LED packaging in the process of assembly and transportation. The colloid is crushed and broken. After a short period of time, the broken lamp will appear blue light, and the LED panel light will appear blue and white, and the quality of the flowers will be green. At the same time, such shoddy parts have poor process precision, large light leakage, large light absorption, and large light loss, which greatly reduces the overall lighting efficiency. The illuminance of the product is far less than required, completely deviating from the energy-saving advantages of LED. Another significant example of structural design, the current industry LED panel lights mostly use a DC plug. The DC connector is used for signal transmission in the weak electronics industry, such as headphones, and has poor over-power capability, and is not suitable for wire connection of different specifications of the LED panel lamp, and the junction of the connector and the wire is It is soldered, and the inferior products in the industry have not been fixed. Therefore, in the environment of assembly, packaging, transportation, installation, etc., it is easy to cause the soldering of the plug to fall off, and a large proportion of the lines are blocked and cannot be lit. And the market can not be repaired serious problems. Fourth, the production process quality control status LED panel light, as an electronic and electrical products, requires strict and rigorous quality management methods and facilities to ensure the reliability of quality, including the performance of the advantages and disadvantages, the stability of use, the guarantee of life. Wait. Usually, from research and development to production and shipment, you need to experience: optoelectronic matching design, structural design, optical design, industrial design, process design and other aspects of the design, and then through the hands-on trial production, photoelectric parameter testing, temperature rise test, life test As well as various physical and chemical stability experiments, the company will enter the development and trial production after verification, and repeat the above-mentioned development and test experiments after the trial production to ensure reliable and stable production. In mass production, it is also necessary to carry out performance and physical and chemical testing of various production materials including LED lamp beads, electronic components, light panels and various optical materials, structural materials, etc., to ensure the conformity and consistency of materials, and In the production process, it is necessary to carry out rigorous online testing to control the quality variation in the manufacturing process at any time. Then, at present, the workshop enterprises in the industry have no design and quality control concepts and practical operations. After assembling and smashing the assembly, they will be dumped to the market after lighting up, causing a large number of low-performance and inferior products to flow to the market. . V. Overall Industrial Design and Process Requirements At present, LED panel lights have the disadvantages of unscientific structure, sloppy craftsmanship and rough production in the ceiling industry, such as solder joint exposure and smashing, which has seriously hit consumers' minds. LED should have a tall image. In summary, the integrated ceiling industry as the main field of LED panel light application, hereby appeals to industry players to pay attention to and face up to the bad situation of LED application in the industry, let us jointly resist the inferiority, show positive energy, lead the industry healthy growth.