Selection and precautions of hydraulic cylinders for excavators
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Statistics show that in 2009 the global polymer consumption was about 176 million tons, of which polyethylene consumption accounted for 38%, close to 67 million tons. The annual growth rate exceeds 5%, and in 2014, the demand for polyethylene will exceed 87 million tons. High-density polyethylene accounts for 17% of global polymer demand, which is approximately 30 million tons; linear low-density polyethylene and low-density polyethylene account for 11% and 10%, respectively.
The report emphasized that the strong growth in demand for linear low density polyethylene and high density polyethylene was attributed to increased use of packaging and non-durable goods. Of the new low-density polyethylene production capacity put into operation worldwide, most products are low-density polyethylene and high-density polyethylene. This year, the economy has bottomed out and demand has grown faster.
At present, the polyethylene supply in the US market has tightened and the operating rate has reached 90%. The situation in the European market is similar to that of the United States. The German domestic market will continue to grow, and the export market will gradually increase. The Turkish market will grow by more than 10% annually, and all regions in the world will be higher than the level in 2009. It is expected that the growth in polyethylene demand in 2011 will not be as significant as this year, and it will be closer to GDP growth, which is an increase of 4.5% to 5.5%.
The hydraulic cylinder of an excavator is one of the important components, which converts hydraulic energy into mechanical energy,
Drive mechanical movement. When purchasing hydraulic cylinders for excavators, the following points should be noted:
1. Size and quality: The size and quality of the excavator hydraulic cylinder should match the model and specifications of the excavator to ensure its normal operation.
2. Pressure and flow rate: The pressure and flow rate of the excavator hydraulic cylinder should match the requirements of the hydraulic system,
To fully utilize the capabilities of the hydraulic system.
3. Sealing performance: The hydraulic cylinder of the excavator has good sealing performance to avoid hydraulic oil leakage or entering the mechanical interior.
4. Durability: The hydraulic cylinder of the excavator has good durability and can withstand long-term heavy load work.
5. Brand and Quality: Choose well-known excavator hydraulic cylinders to ensure their quality and after-sales service
Polymer demand growth in the next five years
According to reports from the United States, due to the drive of emerging economies such as China, India, Latin America, and Central Europe, it is expected that polymer demand will accelerate faster than global GDP growth from 2011 to 2014, with an annual growth rate of more than 5%.