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Keep the number of gears in the tower wheel unchanged. The scheme still uses 10 tower towers, a total of 67 files (with repeating gears of 91 files), the adjustment accuracy is better than the original mechanism, the level difference is below 2, and the maximum step difference is 1.96. The ideal drafting mechanism should be able to achieve full drafting. . 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 requirements of the production process, the step difference of the drafting mechanism of the carding machine is set to 2.
The conditions for the optimal combination of the transforming gears determine the conditions for determining the optimal combination of the transforming gears: the maximum drafting coverage is achieved with a minimum number of gears while ensuring that the drafting coverage and the drafting are all continuous. 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 is in the order of the number of teeth from small to large: Z(1), Z(2), Z(3), ..., Z(n), depending on the number of gear teeth aligned with the crank handle, From the small to the large m file draft values: E (1), E (2), E (3), ..., E (m), let E (i) and E (i 1) for two of them For the adjacent draft value, the draft difference between the two-stage draft values ​​is: u=E(i 1)-E(i)E(i)×100(). It is assumed that the maximum value of m-1 u values ​​of the m-th draft value is umax, and when umax≤2 is satisfied, the draft difference of any adjacent draft value in the drafting coverage is less than 2, That is, the drafting is all continuous.
According to the drafting mechanism of the combing machine tower wheel introduced in the relevant data: ZA/ZB≤1.73. Let K=Z(n)/Z(1), then when K≥1.73, it can meet the production requirements. Stretch coverage. The larger the value of K, the greater the coverage of the draft. A specific step of determining the optimal combination of the transforming gears is to determine the minimum number of gears n1 required to transform the gear combination under the condition that K ≥ 1.73 and umax ≤ 2 are satisfied. For a combination of transform gears having n1 gears, the combination of the number of teeth having the largest K value is determined under the condition that umax ≤ 2 is satisfied.
Program design and operation result program design The program includes the main program main and sub-program sub2 part. The function of the main program is to use the exhaustive algorithm to generate all possible combinations of the number of teeth arranged from small to large "Z(1), Z (2), Z(3), ..., Z(n)", since the main program is relatively simple, the flowchart of the subroutine is omitted. The function of the subroutine is to find the umax value and the program flow chart of the subroutine. Compared with the traditional algorithms provided by various materials, the program not only has an easy-to-understand algorithm, but also can find the optimal gear combination, while the traditional algorithm can only find a better gear combination.
The running result of the program can be known by running the program: when the number of gears of the combination of the gears is ≤8, the conditions of K≥1.73 and umax≤2 are not satisfied; when the number of gears of the combination of the number of optional gears of the gear is 9, there are several satisfying K≥ The combination of the number of teeth of 1.73 and umax ≤ 2, and then according to the principle of maximum drafting of the draft, the optimal combination of the number of available gears of the change gear is determined as "38, 47, 52, 53, 54, 55, 56, 57, 71", the combination Umax=1.99(), K=1.87.
Calculate the m-th draft values ​​E(1), E(2), ..., E(m)umax=0for(i=2;i<=m;i)u=100.0×(E[i 1]-E [i])/E[i]u>2.0YN returns to the main program u>umaxYNumax=u shows Z[1], Z[2], ...Z[n] and umax value subroutine flow chart and current carding machine Compared with the relevant data provided by the transformation gear combination, we determined the combination of the transformation gears, using only 9 gears, that is, achieving full drafting, and the adjustment accuracy and drafting coverage are greatly improved, as shown.