Comparative analysis of several transmission modes of three drum rotary dryer Henan Hongxing

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Comparative analysis of several transmission modes of three drum rotary dryer

At present, Three cylinder rotary dryer As a new product, its design, manufacturing and other links are not mature, and there are few relevant information and industry standards, mainly relying on experience design. There are four kinds of transmission modes of commonly used three cylinder rotary dryer: edge friction drive, edge pin tooth drive, edge gear drive and center drive. Among them, the market share of edge friction drive is 90% (four-wheel drive of supporting wheel accounts for about 4 / 5, and the rest is double drive of supporting wheel); edge pin tooth transmission accounts for about 5%; edge gear transmission accounts for about 3%; and central transmission is relatively rare.

 Three cylinder rotary dryer

1. Edge friction drive

The main reason why the edge friction drive has such a high market share is that its supporting parts and transmission parts are integrated together, so its manufacturing, installation and maintenance are convenient, the production cycle is short and the manufacturing (this mode does not need to manufacture or cooperate with the processing of large and small gears), but there are also the following problems:

(1) Friction drive is prone to slip of supporting roller, which can increase the system output by increasing the rotating speed of rotating parts, and is limited by the friction value between the supporting wheel and the wheel belt, that is, the rotation speed of the rotating parts will restrict the further increase of the output of the three cylinder rotary dryer (when the moisture content of the granular material decreases or the drying thermal efficiency increases, the feed rate should be increased to increase the system output);

(2) Although the friction coefficients of the four roller driving devices are close, there is a big difference in the positive pressure between the tyre and the supporting wheel, and the friction force is also close to each other, so it is difficult to ensure the synchronous operation of the supporting wheel drive device;

(3) The wear of tyre and supporting wheel is fast, which increases the amount of maintenance. Although the structure of the supporting parts and the transmission parts are simple, there are also contradictions that are difficult to reconcile. From the point of view of improving the reliability of supporting parts and reducing the wear of the tyre and supporting wheel, the lubrication between the tyre and the supporting wheel should be increased to make the friction coefficient as low as possible; however, from the perspective of improving the transmission efficiency, the pure rolling friction should be kept between the belt and the supporting wheel to make the friction coefficient as high as possible, so the wear of the tyre and supporting wheel is inevitable.

2. Edge pin tooth drive

The edge pin tooth drive has relatively independent supporting parts and transmission parts. It has the advantages of simple structure, easy manufacturing (because it does not need to manufacture or cooperate to process large and small gears), low cost and convenient disassembly and repair. Especially, when the pin teeth are damaged, only individual pin needs to be replaced to avoid scrapping the whole pin wheel. The transmission efficiency of the gear is not as smooth as that of the transmission edge of the gear, but it is not suitable for the edge of the gear transmission.

3. Edge gear drive

Edge gear transmission is also relatively unique The main problems are relatively difficult to manufacture (large equipment such as vertical lathe and gear hobbing machine), long manufacturing cycle (big gear is steel casting, small gear is forged steel), and production cost is high.

4. Center drive

The center transmission has good stability, less maintenance and noise. The main problem is that the transmission efficiency is slightly lower than the edge gear transmission, and the manufacturing cost is high (the price of matching reducer and motor is higher than that of edge gear transmission, and the rigidity requirements of transmission shaft, connecting shaft and outer cylinder are higher), so its application is less.

The above is a comprehensive comparison of the manufacturing cost, installation and maintenance difficulty and transmission stability of various transmission modes of the three drum rotary dryer. Users can choose the transmission mode according to their own actual situation. If you have any questions, please contact us Red Star machine manufacturer

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