The development status of screw conveyor, existing problems and solutions should be detailed

The status quo of screw conveyor technology in foreign countries.

The development of foreign screw conveyor technology is very fast, which is mainly manifested in two aspects: on the one hand, the function of the screw conveyor is diversified and the application range is expanded, such as high inclination belt conveyor, tubular screw conveyor, space turning screw conveyor and other models; On the other hand, the technology and equipment of the screw conveyor itself have developed greatly, especially the large screw conveyor with long distance, large volume and high belt speed has become the main direction of development, and its core technology is developed and applied to the dynamic analysis and monitoring technology of the screw conveyor, which improves the operation performance and reliability of the screw conveyor. At present, the screw conveyor used in the underground coal mine has reached the main technical indicators shown in Table 1, and its key technologies and equipment have the following characteristics:

Large-scale equipment. Its main technical parameters and equipment are developing towards large-scale to meet the needs of high-yield and high-efficiency intensive production with an annual output of more than 300.5 million tons.

The application of dynamic analysis technology and mechatronics, computer monitoring and other high-tech, the use of high-power soft start and automatic tensioning technology, blower dynamic monitoring and monitoring of the conveyor, greatly reducing the dynamic tension of the conveyor belt, good equipment operation performance, high transportation efficiency.

The use of multi-machine drive and intermediate drive and its power balance, conveyor variable direction operation and other technologies, so that the single machine running length of the conveyor has been theoretically limited, and to ensure the versatility and interchangeability of the conveyor system equipment and the reliability of the unit drive.

New, high-reliability key component technology. Such as CST and other advanced high-power drive devices and speed control devices, high-life and high-speed rollers, self-cleaning drum devices, high-efficiency tape storage devices, fast self-moving tails, etc. For example, the FSW1200 (2 3) 400 (600) PTFE anti-corrosion screw conveyor produced by FSW in the United Kingdom adopts a liquid-viscous differential or frequency conversion speed regulation device, with a transportation capacity of more than 3000 t h.

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With the development of science and technology, the progress of society, the rapid development of the material conveying industry, the screw conveyor used to transport materials has won the love of more and more manufacturers with its excellent performance. The screw conveyor has developed by leaps and bounds today, and with the development of the material handling industry, the screw conveyor has been valued by many industries. After continuous improvement and development, it has gradually developed from the completion of the conveying inside the workshop to the completion of the material handling operation within and between enterprises, and has become an indispensable part of the mechanization and automation of the material handling system.

Botou Jiuyan Environmental Protection has made the following points on the future development trend of screw conveyors:

1) Continue to develop towards large-scale. Large-scale includes several aspects, such as large conveying capacity, large single machine length and large conveying inclination. Many countries are exploring more perfect conveying mechanisms for continuous transportation of materials over long distances and large volumes.

2) Expand the scope of use of screw conveyors. Develop conveyors that can work under high and low temperature conditions, corrosive, house-running, and flammable substances, as well as conveyors that can convey hot, explosive, united, and viscous materials.

3) The structure of the screw conveyor meets the requirements of the automatic control of the material handling system for the single machine.

4) Reducing energy consumption to save energy has become an important aspect of scientific research in the field of conveyor technology.

5) Reduce the dust, noise and exhaust gas generated by the screw conveyor during operation.

The development of foreign screw conveyor technology is very fast, which is mainly manifested in two aspects: on the one hand, the diversification of screw conveyor functions and the expansion of the application range; Another aspect is that the technology and equipment of the screw conveyor itself has developed greatly, especially the long-distance, large-volume, high-speed and other large-scale screw conveyors have become the main direction of development, and its core technology is the development and application of screw conveyor dynamic analysis and monitoring technology, which improves the operation performance and reliability of the screw conveyor. The gap between screw conveyor technology at home and abroad:

The gap in the key core technology of large-scale screw conveyor, screw conveyor dynamic analysis and detection technology, long distance, high power, etc., it is the core technology that restricts the development of large-scale screw conveyor. At present, China uses the rigidity theory to analyze and study the screw conveyor and formulate the calculation method and design specifications, compared with the foreign advanced level, there is still a large gap, and there are still many deficiencies in the process of designing and manufacturing the screw conveyor in China. But we should also be pleased to see that the advancement of science and technology is constantly driving its development.

Screw conveyor.

1. The main reasons for spiral shell rubbing, abnormal movement and static include (1) when the device, for multi-section spirals, it is not good for neutral, and the connecting bolts are not evenly tightened when the center is connected, resulting in the straightness of the entire spiral shaft; (2) As far as the single-section screw is concerned, the centering of the two-head bearing seat is not good, resulting in the screw touching with the trough shell and wiping the shell during operation. The treatment method is relatively simple, that is, to ensure that the straightness and alignment are good, and to ensure that the gap between the spiral and the trough is uniform according to the process requirements and equipment clarification. 2. The primary causes of spiral tearing and deformation include (1) incorrect operation; (2) The material contains large particles of medium, resulting in spiral distortion and damage, when there is no current maintenance or for a long time, it will lead to spiral tearing, deformation, especially serious, spindle deformation or torsion.

Treatment method (1) Operate the screw machine in strict accordance with the operating procedures, and prohibit the load to start the screw machine; (2) Control the hardness and particle size of impurities in the material to ensure that it is within the controllable range of the screw machine; (3) Appropriately improve the quality and strength of spare parts to ensure that the weld is dense and reliable.

Dear, I am glad to answer for you: The method of deformation treatment of the conveying screw of the screw conveyor is as follows: Suggestion:

If the thread of the screw is deformed, you can use the wrench to re-thread the thread, and the nut can be easily screwed. Because, in the process of buckle, the wrench can cut off the deformed and swollen part, so that the thread can be restored to its original shape. You can also use a suitable assorted file to file off the part that is swollen due to deformation, so that the nut can be screwed smoothly.

If only a small size of the screw head is deformed, it can be ground off with a grinding wheel.

According to the situation you described 1) Record the deformation change of the tubular tape, which changes with the change of load during the loading process, and the deformation adjustment of the tape should be carried out according to Table 2. (2) The adjustment of the curve section should be based on the different types of curve sections, and different adjustment methods should be used in the shape field. The starting point of the adjustment should be selected at the same time: (3) The position of the roller has a great influence on the adjustment section of the roller.

In general, it is best to adjust the side idler pulley and the bottom idler. (4) For the long-distance tubular belt conveyor and shouting machine, it can maintain the normal operation state, and can be restored to the centering state when it reaches the transition section between the nose and the tail. When the belt deviates from the normal range, no additional action is required.

Practice has proved that it is more convenient and effective to use the cone block method and the guide roller method, which can ensure the normal operation of the conveyor.