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belt conveyor development since at least the 150-year history, the initial design for the d elivery of the smaller density of grains and other materials, with the rapid development of science and technology, used in the manufacture, design and installation of new technologies, new The emergence of the method and the conveyor belt joint technology continues to improve, the belt conveyor technology has entered a stage of rapid development. In some areas, the belt conveyor has gradually begun to replace the motorcycle and automobile transportation, it has a wide range of transportation of materials, transport capacity, the adaptability of the conveyor line, smooth and reliable and flexible, the crushing of small as well as loading and unloading of materials. low-cost, easy to implement automatic control and energy saving and environmental protection. Has been widely used in many fields such as electricity, food, metallurgy, chemicals, coal, mining, ports, building materials, play an important role in the nat ional economy.
Development Status and Trends of domestic belt conveyor
The belt conveyor industry in China started relatively abroad later, but in basic industries such as metallurgy, mining, coal, transport, energy, building materials, driven by the belt conveyor industry development in China faster. In recent years, domestic belt conveyor production increased year by year, China Heavy Machinery Industry Association data show that in 2009 more than 8 million m belt conveyor production. Production increased year by year, while domestic belt conveyor products, types and skill levels have a greater degree of improvement. China has built a large belt conveyor manufacturers in North Heavy Industries, Sheng Yun, Anhui, Shandong mining machine, and with the implementation of the policy of the country\\ s industrial structure adjustment and energy saving enterprises in the industry began to increase large research and development effo rts, hydraulic automatic tensioning technology, turning technology, flexible brake technology, tape, anti-deviation technology, monitoring, and variable frequency technology gradually applied on the belt conveyor, making the belt conveyor safety and reliability substantial increase at the same time, more than turn on the transport, under the transport and tape flip key technologies have been a good solution. At present, China has independently developed a belt conveyor products with the ability of the equipment of major projects, and has begun to enter the overseas market. According to statistics, in 2009, our country about 15% -20% of the total industrial output value of belt conveyor, belt conveyor export value.
From the point of view of the future prospects for the development of the domestic market, the investment scale of the coal, mining, ports, electricity, steel, grain and other industries will continue to expand, this will also promote the be lt conveyor market demand is increasing; international market developing countries are vigorously developing its own basic industries, countries and regions such as India, Brazil, Southeast Asia, Africa, Latin America, the demand on the belt conveyor is also increasing. Domestic belt conveyor due to the higher cost, highly competitive in the international market. Domestic and international market development point of view, the domestic belt conveyor has a greater demand for space. According to the needs of the market trend, the belt conveyor will move towards long-distance, high power, the direction of development of large capacity, and with the implementation of energy saving policy, as well as government and society as a whole the increase in the degree of attention to production safety, small-scale thermal power, coal and cement production enterprises have been closed, replaced by large enterprises with advanced technology, therefore, higher belt conveyor performance, qua lity, safety and reliability requirements. Determines the overall performance of the machine due to the core parts of the belt conveyor, belt conveyor core components of the specialization and collaboration will become the inevitable trend of development of the industry, driven by the belt conveyor market demand, the market value of its core components are also increasingly prominent.
2, the core components of the belt conveyor
The core of the belt conveyor components, including tensioning devices, brakes and drive.
2.1 tensioning device
The tensioning device is a belt conveyor important and indispensable part of it can to ensure sufficient tension of the belt conveyor drive roller separation point, to prevent the conveyor belt slipping, and the ability to compensate for the excessive operating conditions when the conveyor belt of plastic deformation, maintain normal operation of the conveyor of the required minimum tension force, thus ensuring the normal operation of the belt conveyor. The tensioning device performance of a direct impact on the performance of the whole of the belt conveyor, belt conveyor is particularly important.
The tensioning device earlier, the 1940s of the last century, the Soviet Union and Japan have begun to use in a foreign country, our use of the tensioning device is relatively long time, theoretical research and design methods to be further improved. Throughout the course of development of the tensioning device in China, has gone through mechanical tension, semi-automatic tensioning and automatic tensioning three phases, the mechanical tension is mainly fixed winch-type and hammer two kinds of tension, including fixed winch style tensioner only manual adjustment, can not guarantee that the conveyor belt tension constant, while the heavy hammer tension response is slow, costly and operationally incon venient problem; semi-automatic tensioning mainly refers to the hydraulic winch tensioning device, such tensioning device to the basic realization of the conveyor belt tension constant, while the corresponding speed, lower cost, but there are also large energy consumption equipment badly worn and the high failure rate disadvantage; automatic tensioner hydraulic automatic control mainly refers to tension device, according to the belt conveyor in the start-up phase and the normal and stable operation of stages of different conveyor belt tension, to determine the reasonable control of the tension model, using the hydraulic integration to achieve automatic control of its tension, in order to achieve belt conveyor at startup, braking and stability of the operational phase of constant tension, greatly extending the life of the conveyor belt.
Many of the current domestic industry is still extensive use of machinery and semi-automatic tensioning device, but b ecause of the drawbacks of the two tensioning form in recent years, market demand is gradually tensioning device with hydraulic automatic control. From a marketing point of view of the tensioning device, the tensioning device market in China in 2011 achieved sales of 1.646 billion, an increase of 1.09 times compared with 2007. 2007-2011 market sales and sales of the tensioning device in China, and based on this growth rate, the value of equipment upgrade upgrading a number of factors considered to calculate the tensioning device in the next few years, China\\ s market sales and sales the following table:
2.2 brake
Brakes are applied to the inclination of the belt conveyor safety braking device, mainly used for the realization of the belt conveyor can be controlled to move parking and exceptional circumstances conveyor belt emergency braking, it can effectively prevent the coaster, slipping, rolling materials such as accidents, improve the service life of the conveyor belt. Therefore, the good performance of the braking device is to ensure that key components of the dip-type belt conveyor reliable uptime and smooth flexible parking.
Given the importance of the brake, domestic and foreign scholars have conducted extensive research in the braking system of the belt conveyor. China University of Mining and Technology, Xi\\ an University of Science and Technology, Taiyuan University of Technology, and Shandong University of Science and Technology universities in the country, carried out many years of theoretical research, and designed and developed a series of brake products, the technical level of some products have been close to or to international standards. From the domestic application of the brake situation, including a variety of brake power brake, hydraulic brake, hydraulic brake and disc brake. From the view of the market size, the 2011 sales volume reached 40,000 units , sales reached 933 million yuan. The future, as to further enhance the importance of safety in production by the State and society as a whole, the State Coal Mine Safety Regulations (2011) clearly tilt roadway belt conveyor on transport must be installed at the same time the fortification reversal devices and brake; the next transport to be fitted with a braking device. this series of laws and regulations will make the safe production areas of investment continued to increase both the performance of the belt conveyor with brake more high demand, but also to enhance the economic capacity of the industry, is expected to 2015, China\\ s belt conveyor brake market capacity will reach 20 billion yuan. Market sales and sales of brake equipment in China in 2007-2011, and based on this growth rate to calculate the sales and sales of the domestic belt conveyor brake market in the next few years
2.3 drive
The drive belt conveyor start-u p device, power source, start problem is that the belt conveyor, in particular, large belt conveyor start-up problem is not related to the use of conveyor performance, but also affect belt conveying the economic benefits of the machine. , Drives by their nature can be divided into three categories: Electrical governor, hydraulic governor and controllable drive. The development of the electrical speed drive relatively early, but the technical level is relatively low; Hydraulic Speed ​​drive fluid coupling, the domestic coal mine belt conveyor soft-start device is generally variable speed fluid coupling, mainly through regulating the working chamber, the liquid is full of change output speed and torque, with a certain soft-start function and the governor, but limited to the transmission principle and structure of variable speed fluid coupling in the soft-start far unable to meet the functionality and performance requirements; controlled drive unit is the recent development of new technology, which combines electro-hydraulic technology as one of China\\ s market more mature both CST and BOSS controlled starting device CST system is relatively large, it can achieve effective control of the entire starting process, controlled performance, the actual start of the speed curve and the ideal starting speed curve is very close, so the dynamic tension is smaller, but so far have not been able localization of the CST system. Overall, the technical level of China\\ s drive in more developed countries there is a certain gap.
From the market situation, the drive belt conveyor required core devices show a certain positive correlation between the needs of the belt conveyor, belt conveyor increase in demand for a conservative estimate, China\\ s drive to the 2015 market demand will reach 70 billion yuan.
3, the conclusion
The belt conveyor has good performance characteristics, and flexib le changes in the needs of the downstream industry more widely, more and more demand for space. In addition, with the technological advances of the downstream industry, the performance requirements of the belt conveyor is gradually increased. Specialized division of labor is the main trends of future development, which brought the belt conveyor and its core components of the market space is invaluable.
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