The tower wheel shifting device is widely used in the drafting mechanism of wool spinning machinery. For example, the Italian RC rotary head needle combing machine and the domestic B 144B471B583 and other domestic wool spinning machine maple tower wheel shifting device are more advanced, but currently various wool spinning machine mechanical tower wheel box The combination of the transform gear combination and the improved data provided by the transform gear combination is not optimal. This is an example of a tower wheel shifting device of the RC carding machine drafting mechanism, a Norton gearbox, using a simple and easy-to-understand algorithm, using C language programming to determine The optimal combination of the transformation gears has certain practical significance for the mechanical research of the textile machinery factory, the production and management of the wool textile factory, and the teaching of wool textiles.
1 Norton gearbox mechanism and its adjustment accuracy analysis shows that the Italian RC needle comb drafting adjustment Norton gearbox uses 10 towers, the drafting value E is calculated as: E = 7.95 is the draft constant; Za and the number of gear teeth aligned for the crank handle. The mechanism has a total of 91 drafts. The drafting ratio is very uneven. There are 18 grade differences of more than 2%, and 6 grades are more than 3%. The relevant data proposes improvements. Two kinds of schemes: basically maintain the original adjustment accuracy, and the number of gears in the tower wheel is reduced by one. The scheme adopts 9 tower tower wheels, a total of 55 files (with a total of 73 files for repeated files), and the adjustment accuracy is slightly better than the original mechanism, but there are still several steps with a step difference of more than 2%, and the maximum difference is up to 2 to keep the gears in the tower wheel. The number is unchanged. The program still uses 10 tower towers, a total of 67 files (with repeating files 91 files), the adjustment accuracy is better than the original mechanism, the level difference is below 2%, the maximum step is 1.96%. The ideal drafting mechanism should be able to achieve drafting All in succession. The so-called drafting is continuous, which means that within the coverage of the drafting value, the step difference between the gears is not greater than the design specification. According to the production process requirements, the step of the drafting mechanism of the carding machine is set to 2%. The combined conditions determine the conditions for determining the optimal combination of the transformation gears: under the premise of ensuring that the drafting coverage and the drafting are all continuous, the m-segment main program is set. When the number of changing gears is small, it is advantageous for the manufacturing and processing of the textile machinery factory and the production and management of the textile factory; when the drafting coverage is large, the variety adaptability is good.
Assume that a certain combination of gears, in the order of the number of teeth from small to large: 2 (1), 2 (2), 2 (3) /, 2), depending on the number of gear teeth aligned with the crank, can be obtained from small to Large m-slot draft values: E(1), E(2), E(3), E(m), let E(i) and E(i+1) be two adjacent file drafts For the value, the draft difference between the two-stage draft values ​​is: the maximum value of the m-1 u values ​​of the extension value is um, and when the um2 is satisfied, any adjacent file draft in the drafting coverage range is drawn. The draft difference of the values ​​is less than 2%, that is, the drafting is realized continuously according to the drafting mechanism of the carding tower of the combing machine described in the relevant data: Z4/Z<= When the ç 1.73, the production requirements can be met. The greater the drafting coverage K value, the greater the coverage of the drafting is to determine the specific steps of the optimal combination of the transforming gears: 1 to determine the minimum number of gears required to transform the gear combination m2 for satisfying the general 1-2 condition The transformation gear combination of n1 gears, under the condition of satisfying 2, determine the number of teeth with the largest K value. 3 Program design and operation result 3.1 Program design 2 part, the function of the main program is The algorithm generates all possible optional main programs arranged in small to large numbers. The flowchart is omitted here. The function of the subroutine is to find the umx value. The program flow chart of the subroutine is shown in the figure and various materials. Compared with the traditional algorithm, the program is not only simple and easy to understand, but also can find the optimal gear combination, while the traditional algorithm can only find the better gear combination 3.2 program running results through the m can know the gears on the pan!
When the number of gears is 8, it does not satisfy the condition of 1.2. When the number of gears of the gear combination of the change gear is 9, there are several combinations of the teeth that satisfy the conditions of 1.73 and 2, and then the gears are changed according to the principle of maximum drafting. The optimal combination of the selected number of teeth is determined as “the subroutine flow chart is compared with the current combing machine and the related data to provide the transform gear combination. The combination of the gears we have determined, using only 9 gears, achieves full drafting and adjustment. Accuracy and drafting coverage are greatly improved, as shown in Table 1.
Table 1 Comparison of various transformation gear combinations The gear combination transformation gear combination of Norton gearbox related data determined in this paper only has a few drafting ranges. 4 Conclusion The number of gears used in the transformation gear combination determined in this paper is small, and the manufacturing of textile machinery factory Both the processing and the production management of the textile mill are beneficial.
The drafting is continuous, the adjustment precision is high, the drafting coverage is large, and the variety adaptability is good.
The programming algorithm is simple and easy to understand, and has certain practical significance for mechanical research and teaching.
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