Automatic Spectrogram Analysis For Truetzschler Cards And Draw Frames
Truetzschler has integrated the automatic spectrogram analysis – an important tool for all spinning mills – in the machine control of Truetzschler cards TC 03 and Truetzschler draw frames TD 03
Figure 1
The production of card slivers and draw frame slivers involves a number of machine elements. These are mainly rollers driven by belt wheels, which have a large influence on the sliver quality.
Figure 2
Quality problems occur when the rollers run untrue or the clothing is damaged. This is noticeable in the sliver as mass fluctuation (fig. 1). These mass fluctuations show up clearly as errors in the yarn, woven and knitted fab-rics. To detect errors in time, the card and draw frame slivers are scanned continuously with the aid of a measur-ing funnel (fig. 2) and the resulting signals are evaluated. With these signals a spectrogram is prepared. The mass fluctuations of the sliver are recorded over the wavelength in the spectrogram (fig. 3). On it periodic mass fluctuations can be noticed in form of a "peak" (fig. 4).
Figure 3
Since many years the Truetzschler cards and draw frames are equipped with functions to automatically record and display spectrograms. To be able to determine which of the many elements involved in the production pro-gress is responsible for the malfunction, i.e. for the appearance of a "peak", extensive knowledge of machine structure, actual revolutions, speeds, drafts and their interrelationship is necessary.
Figure 4
Because the error analysis is complicated and requires specialists, Truetzschler has automated this function and integrated it in the control of the Truetzschler cards TC 03 and the Truetzschler draw frames TD 03 as auto-matic spectrogram analysis.
How this automatic spectrogram analysis functions is briefly explained by an example of the Truetzschler draw frame TD 03.
Figure 5
In case of error, the display function "Spectrogram" issues according information (fig. 5, red marking). It is indicated whether a "peak" exists and, if it does, at which wavelength. Then the gearing layout of the draw frame is displayed (fig. 6). Here the machine element in question can clearly be noticed by the according wave-length, marked in red; in this example it is the top rollers of the drafting system (fig. 6).
Figure 6
The automatic spectrogram analysis offers the following advantages:
- Minimizing downtimes and higher productivity by automatic error detection
- Quality improvement by automatic allocation of defective elements
- No calculation or judgement errors
Customers can obtain the automatic spectrogram analysis worldwide and exclusively from Truetzschler. Only the Truetzschler cards TC 03 and the Truetzschler draw frames TD 03 are equipped with this device.