3、 Analysis and calculation method of mechanical wave
3.1 common fault calculation of drafting system
It is the most basic analysis method to calculate the possible fault position according to the transmission ratio or draft multiple. Take the gear transmission parts of jwf1566 ring spinning frame as an example
The wavelength of drafting parts (roller, roller and apron) is λ = π × di × di × E
Where: Di is the diameter of the drafting part; Di is the drafting multiple from the part to the front roller; E is the drafting multiple of the next process.
For example, on the spectrogram of this process:
The wavelength of front roller is π × D (diameter of front roller).
The wavelength corresponding to the middle roller is π × D (diameter of middle roller) × D1 (draft multiple of front zone).
The wavelength corresponding to the apron = π × D (diameter of the epithelial ring) × D1 (draft multiple of the anterior region).
The wavelength corresponding to the rear roller = π × D (diameter of rear roller) × D (total draft multiple).
3.2 calculation of common mechanical faults in carding
Suppose that the carding speed is up (M / min), the doffer diameter is D1 (m), and the doffer speed is N1 (R / min). There is a damage on the doffer card clothing, which causes the uneven thickness of the web after one revolution. The wavelength of the periodic irregularity in the output sliver is λ, which is equal to the perimeter of the faulty part doffer multiplied by the draught multiple D1 from doffer to the output end, that is: λ = π × D1 × D1 = π × D1 × carding speed / doffer linear speed = up / N1
According to the known production speed up and mechanical wave length λ of the equipment, it is easy to calculate N1. Based on this, it is possible to find the parts on the equipment whose rotational speed is basically consistent with N1, which may be the source of the fault. It is more direct and convenient to use this method to analyze the fault position when it is reciprocating.
3.3 calculation method of transmission ratio
Wavelength λ = π × D × I × e
Among them:
D is the diameter of the front roller.
I is the transmission ratio between the gear and the front roller.
E is the draft multiple of the next process.
