JP2701485B2 - Profile calculator for paper machine / coating machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an arithmetic unit used in a paper machine or a coating machine used in the paper industry, and in particular, a profile operation for facilitating operation at the start of operation. Related to the device.

<Related Art> The present applicant has disclosed an outline of a control device in Japanese Utility Model Application Laid-Open No. 63-175,198, "Paper Machine Control Device" and the like.
No. 8,200 proposes a "startup controller for a paper machine controller". The sensor used in such a paper machine control device is disclosed in Japanese Patent Application Laid-Open No. 61-195,303 entitled "Sheet-like object characteristic measuring device". This sensor has a detection end for measuring the basis weight and moisture of paper, and scans a henser head in the paper width direction of paper manufactured by a paper machine or a coating machine to obtain necessary measurement values.

FIG. 4 is a view for explaining the trajectories of two sensors used in the coating machine. In a coating machine, sensor heads are arranged on the upstream side and the downstream side of this process, and the amount of coating is determined using the difference between the measured values. Here, in order to remove fluctuations in the paper flow direction, it is necessary for the downstream sensor head after coating to accurately trace the trajectory of the scanning of the henser head before coating and perform measurement. Such an operation is called "synchronous operation", and the time required for the paper measured on the upstream side to reach the downstream side is called "transport delay time". Further, there are two types of scanning states of the sensor, and there are synchronous scanning used in a steady state and simultaneous scanning used in a transient state. Synchronous scanning refers to the state in which the downstream sensor calculates the coating amount by subtracting the upstream data before the transport delay time from the current data on the downstream side in the synchronous operation state, and simultaneous scanning means that the downstream sensor is on the upstream side This is a case where scanning is performed irrespective of the data, and the coating amount calculation uses the current data for both upstream and downstream.

<Problems to be Solved by the Invention> However, according to the conventional apparatus, immediately after the measurement start command, the scanning is once performed from the retreat position to the opposite side, and then the simultaneous scanning is performed. No profile updates were made. Therefore,
If the transport delay time is long, the progress cannot be known until the downstream sensor head enters the synchronous operation state,
There was a problem that the operator's request to immediately know the current driving condition could not be answered. Also, in such a device, if the profile suddenly changes, an alarm is issued because some abnormality is considered to have occurred on the coating machine side, but the transport delay time is determined from the data of simultaneous scanning. The profile often changes between the data of the synchronous scans after the elapse, and there has been a problem that this alarm is generated unnecessarily and the operator is unnecessarily stimulated.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and provides a profile calculating device of a paper machine / coating machine for obtaining transient data until a synchronous operation state is established between upstream and downstream sensors. With the goal.

<Means for Solving the Problems> The present invention that achieves the above object includes an upstream sensor arranged on the upstream side of a paper machine or a coating machine, and a downstream sensor arranged on the downstream side of the upstream sensor. A side machine, and an arithmetic unit of a paper machine / coating machine including an arithmetic unit for calculating a paper quality change amount in the paper machine or the coating machine from the detection value of the upstream sensor and the detection value of the downstream sensor, It is configured.

That is, an upstream profile creating unit that scans the upstream sensor in the width direction of the paper to measure the profile of the paper before the paper quality change, and temporarily stores profile data for each scan created by the upstream profile creating unit. And a data buffer having a storage capacity for storing the profile data of at least the number of scans determined by the paper feed speed in the normal operating state and the interval between the upstream and downstream sensors, and the downstream sensor. Downstream profile creation means for scanning in the width direction of the paper to measure the paper profile after the paper quality has changed.

The paper quality change amount calculating unit traces the position measured by the upstream sensor and scans the downstream sensor, and the paper quality change profile created by the downstream profile creation means and the data buffer. From the profile before the paper quality change at the position corresponding to the profile after the paper quality change, and calculates the paper quality change amount from the difference. If the position measured by the upstream sensor has not reached the downstream sensor, the downstream It is characterized in that the profile after the change in paper quality created by the side profile creation means and the profile before the change in paper quality measured first from the data buffer are read out, and the amount of change in the paper quality is calculated from this difference.

<Operation> Each component of the present invention performs the following operation. The upstream profile creation unit measures the paper quality before the paper quality change, and the downstream profile creation unit measures the paper quality after the paper quality change, and operates the intervening dryers and coating machines that change the paper quality. Send the basic data for grasping the status. The data buffer temporarily stores the upstream profile measured during at least the transport delay time. The paper quality change calculation unit calculates the paper quality change during synchronous operation from the downstream profile creation means and the data in the data buffer for the synchronous scan. Further, the paper quality change calculation unit uses the first data after the start of the measurement or the first one of the data stored in the data buffer after the start of the measurement among the data of the downstream profile creation means and the data of the data buffer at the start of the measurement, as data. The profile of pseudo-synchronous operation is calculated. The profile obtained by the paper quality change amount calculation unit is used for displaying or recording the paper quality or used for control.

<Example> Hereinafter, the present invention will be described with reference to the drawings.

FIG. 1 is a configuration block diagram showing one embodiment of the present invention. In the figure, an upstream sensor 10 includes a head position detecting mechanism 11 that detects a position in a paper width direction of a sensor head that measures moisture, basis weight, and the like of paper, data related to a measured value of the sensor head, and data related to the measured position. And a head drive device 13 for driving the position of the sensor head to various fixed positions.
The sensor head is driven, for example, at a position determined by dividing the number of measurement points into 360 with respect to the paper width, and the sensor head control unit 12 issues an instruction to the head driving device 13 to move the sensor head in a reciprocating linear manner in a step-like manner. Exercise and take measurements at defined locations.

The upstream profile creation unit 15 receives the position measured by the sensor head control unit 12 and a signal from the sensor, and creates a profile. Here, the profile is obtained by taking the width direction of the paper in the horizontal axis direction and providing the measurement value axis in the vertical axis direction, and each measurement value is plotted on this graph. The feature is that the uniformity of the basis weight and the moisture content in the width direction of the paper and the deviation from the target value can be easily visually recognized. The profile transmission unit 16 transmits the profile for one scan created by the upstream profile creation unit 15.

The downstream sensor 20 is installed after the drying device or the coating machine of the paper machine.The upstream sensor 10 measures the characteristics before the paper quality changes, and the downstream sensor 20 measures the characteristics of the changed words. The amount of paper quality change due to the intervening process is determined. The downstream sensor 20 includes a head position detection mechanism 21, a sensor head control unit 22, a head driving device 23, and a downstream profile creation unit 25 as those common to the upstream sensor 10. The profile receiving unit 26 receives the information transmitted from the profile transmitting unit 16 and sends the information to the data buffer 27. The data buffer 27 temporarily stores the profile data for each scan created by the upstream profile creation unit 15 and at least stores the storage capacity at the paper feed speed in the normal operation state and the upstream and downstream sensor heads. It has a value that can store the profile data of the number of scans determined by the interval, for example, for 8 scans. The paper quality change calculator 28 calculates the paper quality change from the data of the downstream profile generator 25 and the data of the upstream profile generator 15 temporarily stored in the data buffer 27, and has the following two modes. . First
In the synchronous mode, while the position measured by the upstream sensor is traced and the downstream sensor scans, the post-change paper profile created by the downstream profile creation unit 25 and the data post-change profile from the data buffer 27 are used. Is read out and the paper quality change amount is calculated from the difference. The second type is a pseudo-synchronous mode, which is used in a temporary state after the normal measurement start command is received and before the synchronous mode is entered, in which the position measured by the upstream sensor has not reached the downstream sensor. Then, the post-paper-quality change profile created by the downstream-side profile creation unit 25 and the first measured-before-paper-quality-change profile are read from the data buffer 27, and the paper-quality change amount is calculated from this difference. If the process has already reached the normal operation speed, the first data after the start of the data buffer 27 is used, and if the process starts simultaneously, the first data after the start command of the data buffer 27 is used. Alternatively, the first data stored thereafter is used.

The operation of the device configured as described above will now be described. FIG. 2 is a diagram showing the operation trajectories of the upstream sensor 10 and the downstream sensor 20 arranged side by side, where (A) is the upstream sensor and (B)
Indicates a downstream side, and (C) indicates a synchronous state. The upstream sensor 10 starts a reciprocating scan after the measurement start command. The downstream sensor 20 scans in one direction after the measurement start command, waits for a time corresponding to the fractional scan required for the synchronous operation,
Thereafter, a reciprocating scan is started. Here, since the transport delay time is about 4.7 scans, the distance operation equivalent to 0.7 scans is stopped, and then one scan is performed. This state is a simultaneous scan. When one scan is made downstream,
Since the contents of the data buffer 27 are updated,
The scan is a pseudo sync scan. Then, when the transport delay time has elapsed, the back initially measured by the upstream sensor 10 is again measured by the downstream sensor 20,
It becomes a synchronous scan state. It should be noted that in the figure of the synchronous state, a triangle mark ▲ indicates the update timing of the profile.

FIG. 3 is a diagram for explaining the data accumulation state of the data buffer 27 in time series. FIG. 3A shows the state after the first scan is completed.
(B) is an explanatory diagram of a synchronous scanning state after the second scanning is completed, and (C) to (E) of FIG. When the first scan is performed, the first profile obtained by the upstream profile creation unit 15 is recorded in the data buffer 27. The remaining seven scans are empty. Next, when the second scanning is performed by the downstream sensor 20, the first profile is shifted to the second column, and the latest data is recorded in the first column. This state is a pseudo scan state. Next, when the fifth scan is performed, since the transport delay time has elapsed, the synchronous scan state is established. The fifth column is recorded in the first column, and the profile related to the first scan is recorded in the fifth column. Is recorded, the data in the fifth column is converted to the paper quality change amount calculation unit 28.
To determine the amount of change in paper quality. When the sixth scan is completed, the second data is recorded in the fifth column, and this value is used by the paper quality change amount calculation unit 28. When the eighth scan is completed, the fourth data is recorded in the fifth column, and the eighth column of the data buffer 27 is filled with the first data. When the subsequent scanning is performed, the old data is discarded because the capacity of the data buffer 27 is equivalent to eight scans.

In the above embodiment, the profile calculation has been described as an example. However, the present invention is not limited to this, and can be similarly applied to a synchronous calculation of fixed point measurement instantaneous values.

<Effects of the Invention> As described above, the present invention has the following effects.

A pseudo-synchronous calculation is performed between the measurement start command and the elapse of the transport delay time so that a profile change can be captured, thereby responding to a request to immediately know the current operating state of the operator.

Since the scan is shifted from the synchronous scan to the synchronous scan via the pseudo-synchronous scan, a sudden change in the profile after the lapse of the transport delay time as in the related art is less likely to occur, and a false alarm is less likely to occur.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG.
FIG. 3 is a diagram showing the operation trajectories of the upstream sensor 10 and the downstream sensor 20 arranged vertically, FIG. 3 is a diagram illustrating the data accumulation state of the data buffer 27 in chronological order, and FIG. FIG. 4 is a diagram for explaining the trajectories of two sensors used in the machine. 10 …… Upstream sensor, 15 …… Upstream profile creation unit,
20 …… Downstream sensor, 25 …… Downstream profile creation unit,
27 Data buffer, 28 Paper quality change calculation unit.

Claims (1)

(57) [Claims] An upstream sensor disposed upstream of a paper machine or a coating machine, a downstream sensor disposed downstream of the upstream sensor, a detection value of the upstream sensor and a downstream sensor. In the arithmetic unit of the paper machine / coating machine provided with the arithmetic unit for calculating the paper quality change amount in the paper machine or the coating machine from the detected value of the above, the upstream sensor is scanned in the width direction of the paper, Upstream profile creation means for measuring the profile of the paper; and temporarily storing the profile data for each scan created by the upstream profile creation means, and at least storing the storage capacity with the paper feed speed in a normal operation state. A data buffer having a value that can store the profile data of the number of scans determined from the interval between the upstream side and the downstream side sensor, and scanning of the paper after the paper quality change by scanning the downstream side sensor in the width direction of the paper. Downstream profile creating means for measuring the profile, and in a state where the downstream sensor scans by tracing the position measured by the upstream sensor, the paper quality changed profile created by the downstream profile creating means and From the data buffer, the profile before the paper quality change at the position corresponding to the profile after the paper quality change is read and the paper quality change amount is calculated from the difference.In a state where the position measured by the upstream sensor has not reached the downstream sensor, A paper quality change amount calculation unit that reads the post-paper quality change profile created by the downstream profile creation means and the first measured paper quality change profile from the data buffer and calculates the paper quality change amount from the difference. Characteristic profile calculator for paper machine / coating machine.