After unremitting efforts have also made very great development achievements, domestic experts on the belt conveyor key technology research and the development of new products have achieved gratifying results, conveyor product series is still increasing, from the commonly used SDJ, SsJ, STJ, STJ, etc. DT and other series products have developed into a variety of belt conveyor series products that are multi-functional and can adapt to special uses. In recent years, with the development and needs of advanced coal mine technology, China has carried out theoretical research, tests and product development on the key technologies and key parts of new conveyor equipment such as large-angle fixed belt conveyor, high-yield and high-efficiency working face stretchable belt conveyor, long-haul belt conveyor and large-volume belt conveyor.

one Development of belt conveyor at home and abroad

1. In the 1950s and 1960s, for long distance, large volume and high speed belt conveyors, steel rope core belt conveyors and steel rope traction belt conveyors were mainly used. The steel rope core belt conveyor can realize long-distance transportation, simplify the transportation system, and improve the production efficiency, so it is widely used. Since 1966, China has designed and manufactured this kind of conveyor successively, and used it in Fenghuangshan Coal mine, Maoming oil shale open-pit mine in Guangdong Province. One disadvantage of the steel rope core belt conveyor is that the steel rope core conveyor belt in operation, if it is stuck by a sharp object, the conveyor belt will be split longitudinally. The most fundamental difference between the steel rope traction belt conveyor and the ordinary conveyor is that it separates the bearing member and the traction member. The special conveyor belt with ear grooving, fabric core, transverse steel bar and upper and lower rubber covering is used as the bearing member. The steel rope traction belt conveyor has a complex driving device, poor trouging of the conveyor belt and small translocation section. The spring steel bar in the traction rope, the lining of the rope support wheel and the conveyor belt is seriously damaged, and the maintenance is large. In particular, the problems of the three major wearing parts of the steel wire rope, wheel liner and steel bar seriously affect the use and development of this model.

2, in the 1970s, foreign countries developed long-distance belt conveyor in the form of intermediate multistage drive. The intermediate drive has linear friction drive, pneumatic tire drive and magnetic drive. Linear friction drive is to install several short belt conveyors in a long distance belt conveyor, and to drive the long distance conveyor with the friction generated by the close contact between the branch conveyor belt and the conveyor belt of the long distance belt conveyor on each short belt conveyor. Because of the linear friction drive form, the drive device can be arranged on the whole length of the long distance conveyor, so it can greatly reduce the tension of the conveyor belt compared with the ordinary belt conveyor. For the same conveying height, increasing the conveyor inclination can shorten the conveyor length and reduce the footprint. There are several ways to increase the conveyor Angle: increasing the friction coefficient between the material and the conveyor belt, increasing the pressure between the material and the roller, setting a transverse partition on the conveyor belt, using a magnetic field, and so on. In the 1970s, a variety of forms of large Angle conveyor were developed, such as patterned belt conveyor, wavy rib belt conveyor, magnetic large Angle conveyor, entrainage conveyor and so on. These conveyors are able to achieve a large Angle of transport, and can even achieve vertical lifting of goods. In the 1970s, Dutch scientists proposed the theory of air cushion tape transport through a series of laboratory and field studies. The air cushion belt conveyor has a tape around the driving drum and the tensioning drum, and the air bin is arranged under the loaded branch tape between the drums. Compressed air is ejected from the air bin to lift the tape and form an air cushion between the belt and the groove surface of the roller. The disadvantage of air cushion belt conveyor is that the cost is higher, due to the loss of air pressure along the gas supply line and the energy consumption is larger, especially when the conveying line is longer, in addition, the local overload will hinder the belt support, which is not suitable for transporting heavier materials and block materials.

3. In 1984, the Hungarian Mining Research Institute developed a new type of belt conveyor with a water cushion instead of a roller. In a chute filled with hydrostatic water, the water is the tape, the tape is the material transported, when the support buoyancy under the tape is greater than the weight on the belt, the belt together with the material will not sink, by adjusting the static pressure of the water, you can change the gap between the belt and the groove. The layer of water between the belt and the trough is called the water cushion. This type of water cushion transport is 80% less transport than the usual belt roller structure transport, and the equipment investment is only half of it. In the 1980s, Russia's Kuzbass Institute of Technology trial-produced magnetic tropical conveyor, its structure is similar to the ordinary belt conveyor, the difference is only that the roller is replaced by a flat barium iron magnet. Duct tape is actually an elastic magnet. The tape magnetic support is simple to make and can be produced in series. The magnet produces a stable push force along the entire conveyor line without the need for power supply. The magnetic bearing is simple in design and can be made into standard parts. Magnetic mat conveyor is almost noiseless, cheap to install and maintain. The disadvantage of magnetic pad belt conveyor is that special magnetic tape is required to ensure that the lateral movement of the tape is more complicated, and the material conveying range is limited.

4, in the 1990s, China's Coal General Institute began to study the chute belt conveyor, and achieved good results. The key component of the conveyor is the chute support. The chute bracket is riveted and welded to the frame, and the sliding strip supports the conveyor belt and carries the material. The sliding strip is made of polymer materials and composites based on it, which have lower friction coefficient and better wear resistance. The main features of the chute belt conveyor are simple structure, stable and safe operation, and high production efficiency. Maintenance, cleaning workload less, strong adaptability.

two The development trend of belt conveyor

The development of belt conveyor technology is rapid, which is mainly manifested in two aspects: on the one hand, the function of belt conveyor is diversified and the application scope is expanded, such as high-angle belt conveyor, tubular belt conveyor, space turn belt conveyor and other models; On the other hand, the technology and equipment of the belt conveyor itself has been greatly developed, especially the long distance, large volume, high belt speed and other large belt conveyor has become the main direction of development, its core technology is developed and applied to the dynamic analysis and monitoring technology of the belt conveyor, improving the operating performance and reliability of the belt conveyor. Through the above analysis, it can be predicted that the new belt conveyor model in the future should have the following characteristics:

1. Continue to develop to large scale. The large scale includes several aspects such as large conveying capacity, large single length, large conveying Angle and high power. The length of the hydraulic conveyor has reached more than 440 kilometers. The single length of the belt conveyor has been nearly 15 km, and there have been a number of "belt conveyor" connecting the two places. Many countries are exploring a more perfect conveyor structure for long-distance and large-volume continuous conveying of materials.

2, improve component performance and reliability. 0b c o(? 9l:S sPROE,auto  cad,CAD download,cad tutorial,cad shortcut key, Mechanical forum, Mechanical Design forum, Mechanical manufacturing forum, conveyor forum, dust removal technology forum, vibration forum, chemical forum, mechanical forum, mechanical CAD forum, engineering machinery forum,UG,CAXA,CAXA Solid design, Design manual,inventor,soli The high and low opening probability of dworks,CAXA electronic drawing board, mold, fixture equipment mainly depends on the performance and reliability of the component. In addition to further improving and improving the performance and reliability of the existing components, it is necessary to continuously develop and research new technologies and components, such as high-performance controllable soft start technology, dynamic analysis and monitoring technology, efficient belt storage device, fast self-shifting tail, high-speed rollers, etc., so that the performance of the belt conveyor can be further improved.

3. Low production cost. In the ordinary belt conveyor, the cost of idler manufacturing accounts for 17% to 25% of the entire belt conveyor, and there are too many moving parts, and the maintenance cost is expensive. The most effective way to reduce the cost of belt conveyor is to use non-stick support or non-contact support.

4. Low energy consumption. Reducing energy consumption to save energy has become an important aspect of scientific research in the field of transportation technology. The energy consumed by transporting 1 ton of material 1 kilometer has been taken as one of the important indicators of conveyor selection. About 80% of the energy of belt conveyors is consumed in friction losses. The most effective way to reduce friction loss is to use a non-contact belt conveyor (such as a water cushion belt conveyor), which requires only 20% of the motor power of an ordinary belt conveyor.

5. Low pollution. Reduce the dust, noise and exhaust gas produced by various conveyors during operation.

6. Intelligence. Future models should be closely connected with computers, suitable for program control and intelligent operation. Material handling, machine installation and maintenance should be able to achieve intelligent management. The application of dynamic analysis technology and mechatronics, computer monitoring and other high and new technologies, the use of high-power soft start and automatic tensioning technology, dynamic monitoring and monitoring of the conveyor belt, greatly reduce the dynamic tension of the conveyor belt, equipment performance is good, high transport efficiency.

It can be predicted that belt conveyor as a conveying capacity, low operating costs, wide range of use, simple structure, easy to maintain, less energy consumption, low cost of use of transportation equipment and will get a wider range of applications, the market prospects are very promising. Large-scale, high efficiency, low cost, low carbon environmental protection and intelligent control have become the main development direction of belt conveyor in the future.