JPH05230786A - Frequency analysis displaying device for paper machine - Google Patents

Abstract

PURPOSE:To provide a frequency analysis displaying device for a paper machine effective in facilitating the diagnosis of the apparatus by displaying the result of a power spectrum in combination with the apparatus information of the paper machine. CONSTITUTION:The objective device is composed of a flow-direction data memory 30 for storing the data of the flow direction of paper relating to the data determined by sensors 20 for the areal density, water-content, etc., of the paper produced by a paper machine 10 having roll 14, belt, etc., a spectrum analyzing part 40 to perform the frequency analysis operation on the time series data stored in the flow-direction data memory, an imaging task part 50 for displaying the spectrum calculated by the spectrum analyzing part, an apparatus information conversion part 60 to calculate the corresponding roll diameter or belt length of the peak frequency from the peak frequency of the spectrum operated in the spectrum analysis part and the machine speed of the paper machine, and an apparatus information displaying part 70 to display the roll diameter or the belt length calculated by the apparatus information conversion part together with the spectrum displayed by the imaging task part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frequency analysis display device suitable for use in a paper machine or the like, and more particularly to an improvement for providing information presented for facility diagnosis.

[0002]

2. Description of the Related Art The applicant of the present invention has proposed a paper machine controller in Japanese Utility Model Publication No. 63-175198. In such a control device, a device that performs signal processing for facility diagnosis is disclosed in, for example, Japanese Patent Application No. 3-110167.

[0003]

However, even if the power spectrum is simply displayed, it is difficult to identify from which roll the paper machine originated, and it cannot be very important information for the operator. There were challenges. Further, what can be useful information as a spectrum is one having a certain power value or more, and the operator sequentially refers to such peaks. In this case, conventionally, there is a problem in that the cursor must be operated in accordance with the peak only by moving the cursor along the frequency domain, which is a complicated task.

The present invention has solved such a problem, and the first object is to analyze the frequency of a paper machine by displaying the result of the power spectrum and the equipment information of the paper machine in association with each other to facilitate the equipment diagnosis. It is to provide a display device.
A second object is to provide a frequency analysis / display device in which the spectrum peak can be easily searched.

[0005]

Means for Solving the Problems The present invention, which achieves such an object, relates to a sensor for measuring the basis weight, moisture content, etc. of paper manufactured by a paper machine having rolls, belts, etc.
A flow direction data storage unit that stores data in the flow direction of paper relating to the data measured by this sensor, and a spectrum analysis unit that performs frequency analysis calculation on the time-series data stored in this flow direction data storage unit. , A screen task unit that displays the spectrum calculated by this spectrum analysis unit, the peak frequency of the spectrum calculated by the spectrum analysis unit, and the papermaking speed of the paper machine, the roll diameter or belt length of the corresponding peak frequency. And an equipment information display unit that displays the roll diameter or belt length calculated by the equipment information conversion unit together with the spectrum displayed by the screen task unit.

[0006]

The flow direction data storage unit stores the signals measured by the sensor in time series. The spectrum analysis unit analyzes the frequency of the signal measured by the sensor and checks whether there is a peak frequency at which regular fluctuation appears. The screen task section displays the spectrum analysis result and time series data. The equipment information conversion unit calculates a standard of what shape the equipment corresponds to the peak frequency, and sends it to the equipment information display unit.

[0007]

The present invention will be described in detail below with reference to the drawings. FIG. 1 is a configuration block diagram showing an embodiment of the present invention. In the figure, a paper machine 10 is a general paper making process, and includes a head box 12 for supplying a stock solution containing pulp components, a roll 14 for winding up paper, and a belt (not shown) provided on a wire part for removing moisture. No.) etc. The sensor 20 measures the quality such as the basis weight and the moisture content of the paper by scanning in the paper width direction, and its external pressure gauge and thermometer are used for process control. The sensor management unit 22 grasps the measurement position of the sensor 20 and manages the measurement data. Since the position in the width direction and the position in the flow direction are important indexes in paper manufacturing, These two components are extracted. For this extraction, the technique disclosed in JP-A-1-192892 is used. The flow direction data storage unit 30 extracts the flow direction component from the signal measured by the sensor 20, and when the sensor 20 is fixed without scanning, the data measured at fixed time intervals may be used. Incidentally, when the frequency bands of the fluctuation in the width direction and the fluctuation in the flow direction are different, and therefore the two can be easily separated by frequency analysis,
The measurement data sent from the sensor may be used as it is.

The spectrum analysis unit 40 is for performing frequency analysis on the data stored in the flow direction data storage unit 30.
For example, fast Fourier transform (FFT) is used. The screen task unit 50 displays the frequency analysis result calculated by the spectrum analysis unit 40, and the flow direction data storage unit 30.
It is preferable that the time series data stored in is also displayed.
The equipment information conversion unit 60 calculates the peak frequency among the frequency analysis results calculated by the spectrum analysis unit 40, and the roll diameter and the belt length corresponding to the corresponding peak frequency from the paper making speed of the paper machine. In this case, from the assumption of the signal processing theory, in order to use the constant time sampling as the spatial data, it is necessary to establish the constant interval sampling. Therefore, during the sampling of the flow direction data which is the analysis target in the spectrum analysis unit 40. , The machine speed needs to be constant. The equipment information display unit 70 displays the roll diameter and the belt length calculated by the equipment information conversion unit 60, and here, the screen task unit 5
The same screen as the screen displayed by 0 is performed. The counter value is an index indicating the identity of the data in the flow direction data storage unit 30, and the screen task unit 50 stores the counter value of the currently displayed screen as the previous value, so that the flow direction data storage unit It is determined whether the data of 30 has already been processed by the spectrum analysis unit 40.

FIG. 2 is a diagram showing an example of a screen display. As the image that the screen task unit 50 is in charge of management, a portion 52 that displays a set of flow direction data that is the target of the analysis in the spectrum analysis unit 40, and the next spectrum analysis unit 40.
The present flow direction data storage unit 30 to be analyzed has a bar graph data acquisition display unit 53 for displaying the number of data being acquired, and a power spectrum display unit 54 analyzed by the spectrum analysis unit 40. As for the peak frequency, a peak display section 56 marked with ▼ provided in the spectrum display section 54, and a peak displayed by the peak display section 56 is moved to an adjacent peak by the marks "<<" and ">>". It has a peak transition instructing section 57, and a frequency analysis display section 58 for numerically displaying the power (magnitude) and frequency (cycle) of the peak displayed by the peak display section 56. Further, as other display elements, some so-called soft keys such as a key for instructing the flow direction data storage unit 30 to start data acquisition, a lock key for suppressing the screen display update, and a key for specifying the acquisition cycle. Is provided. Further, the effective power rank setting unit 55 inputs the lowest rank for recognizing the peak frequency in the spectrum displayed on the spectrum display unit 54. When this input is selected, the screen is switched to the numerical value setting screen. Become. This way,
The peak transition instructing unit 57 ignores a small peak having only a small power value and moves to an adjacent peak having a certain peak value with one touch. Along with this, the frequency analysis display unit 58 is also switched.

The equipment information display section 70 is a frequency analysis display section 5
This is displayed alongside 8, and data useful for equipment diagnosis corresponding to peak frequencies such as machine speed, diameter, and surroundings is displayed. Here, since the machine speed is 1000 m / min and the frequency is 13.3 Hz, the diameter (roll diameter) is 397 mm and the circumference (belt length) is 1.25 m. Preferably, the relevant part of the paper machine having such a value should be specified.

3A and 3B are explanatory views of a usage state of the peak transition instructing section 57, where FIG. 3A shows before operation and FIG. 3B shows after operation. Here, there are two peaks on the left and right, and each has a peak value exceeding the threshold value determined by the effective power rank setting unit 55. Initially, the peak display portion 56 marked with ▼ is located on the left peak. When the peak transition instructing section 57 is operated to instruct the right side transition, the peak display section 56 indicated by ▼ moves to the adjacent right side peak. Preferably, in addition to the mode of jumping to an adjacent peak, the peak transition instructing unit 57 has a mode of sequentially moving to an adjacent frequency in addition to the frequency at which the peak display unit 56 is located. Useful for operators.
Alternatively, a list of peak frequencies having peak values exceeding the threshold value determined by the effective power rank setting unit 55 may be displayed.

[0012]

As described above, according to the present invention, the equipment information conversion unit is provided, and the peak frequency is converted into information useful for equipment diagnosis of the paper machine by linking the spectrum analysis result and the paper making speed. Therefore, there is an effect that it is possible to identify a roll or a belt that causes defective paper at an early stage. Further, providing the effective power order setting unit 55 and the peak transition instructing unit 57 in the peak display unit 56 has an effect of facilitating the peak search.

[Brief description of drawings]

FIG. 1 is a configuration block diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing an example of a screen display.

FIG. 3 is an explanatory diagram of a usage state of a peak transition instruction unit 57.

Claims (2)

[Claims] Claim: What is claimed is: 1. A flow for storing, in a paper machine manufactured by a paper machine having rolls, belts, etc., a sensor for measuring basis weight, moisture content, etc. A direction data storage unit 30, a spectrum analysis unit 40 that performs a frequency analysis calculation on the time series data stored in this flow direction data storage unit, and a screen task that displays the spectrum calculated by this spectrum analysis unit Section 50, equipment peak information of the spectrum calculated by the spectrum analysis section, and equipment information conversion section 60 that calculates the roll diameter or belt length of the corresponding peak frequency from the papermaking speed of the paper machine, and this equipment information conversion And a facility information display section 70 for displaying the calculated roll diameter or belt length of the section together with the spectrum displayed by the screen task section. Frequency analysis display apparatus of a paper machine, characterized. 2. The screen task section recognizes a spectrum display section 54 for displaying a frequency spectrum, a peak display section 56 for displaying as a peak a frequency recognized as a peak frequency in the frequency spectrum, and a peak. 2. The paper machine according to claim 1, further comprising: an effective power order setting unit 55 that determines the lowest order of the power value of the frequency spectrum required for the above, and a peak transition instruction unit 57 that transitions the peak display to the adjacent peak. Frequency analysis display device.