Tower cranes typically use a combination of fixed and movable pulleys to lift and lower heavy loads. The pulleys are usually attached to the jib or boom of the crane and are used to change the direction and increase the mechanical advantage of the lifting system.
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According to the analysis of relevant persons from the City, Industry and Information Industry Bureau, the rapid development of the equipment manufacturing industry laid the foundation for Baoji's rapid industrial growth. Affected by the country’s revitalization industrial planning policy, Baoji’s equipment manufacturing industry saw a significant increase in production. From January to April, the total industrial output value was RMB 12 billion, an increase of 29.2%, which contributed to an increase of 9.9 percentage points in Baoji’s industrial production, and an increase in industrial production above designated size. The contribution rate reached 37.9%. In particular, the transportation equipment manufacturing industry represented by Shaanxi Automobile Group and Fast Company, and the general equipment manufacturing industry represented by Qinchuan Machine Tools Group have a strong growth momentum. The equipment manufacturing industry succeeded in replacing the metallurgical industry and successfully prevented the significant fluctuations in the industrial economy of Baoji City. Since the beginning of this year, the trend of macroeconomic stability has been further improved. Baosteel Group, with a large production scale of large enterprises and groups, has the highest growth rate in industrial output value, which has increased by 166.2%. In January-April, large industrial conglomerates accumulated a total industrial output value of 18.364 billion yuan, accounting for more than half of the total industrial output value above designated size, and contributed 45.7% to the growth of industrial production. In addition, the low base last year is also one of the reasons for the rapid growth this year. In the same period of last year, Baoji City Industrial Department was in a period of serious financial crisis and production was in a low-speed period. Among the 528 large-scale industrial enterprises in the city, the production of 180 enterprises declined. This year, the production status of enterprises has improved greatly. Two-thirds of the 180 companies that had been declining last year have already experienced a two-thirds increase in production growth. From January to April, of the 37 major industrial products monitored statistically, there were 31 types of output that had grown over the same period of last year. Among them, the output growth of high and low voltage switchboards, CNC machine tools, metal cutting machine tools, and other industrial products such as sulfuric acid are all over 1 times.
As the macroeconomic stability became more positive, the business confidence increased. A survey conducted by the Baoji Survey Team of the National Bureau of Statistics found that the city’s entrepreneur confidence index and corporate business climate index both climbed to the highest level since the financial crisis.
Some common types of pulleys used in tower cranes include:
1. Fixed Pulleys: These are stationary pulleys that are mounted at a fixed point on the crane. They change the direction of the lifting force and help distribute the load evenly.
2. Movable Pulleys: These pulleys are attached to a movable block that can be raised or lowered along the jib or boom of the crane. They provide additional mechanical advantage and allow for easier lifting of heavy loads.
3. Trolley Pulleys: These pulleys are used in conjunction with a trolley system that allows the crane to move horizontally along the jib or boom. The trolley pulleys help distribute the load evenly and provide smooth movement of the crane.
4. Counterweight Pulleys: Tower cranes often use a counterweight system to balance the load being lifted. Counterweight pulleys are used to attach the counterweights to the crane and ensure proper balance and stability.
It's important to note that the specific configuration and number of pulleys used in a Tower Crane can vary depending on the crane model and lifting capacity.
Since the beginning of this year, confidence in the industrial market above designated size in Baoji has increased and production has continued to grow rapidly. From January to April, the total industrial output value of industrial enterprises above designated size in the city has completed a total of 34.767 billion yuan, an increase of 26.1%; realized industrial added value of 11.79 billion yuan, an increase of 18.1%.