JP2748614B2 - Paper machine / coating machine controller - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a paper machine or a coating machine, and more particularly to an improvement in sensor operation control when a plurality of frames are installed in parallel.

<Prior Art> The present applicant discloses an outline of a control device in Japanese Utility Model Application Laid-Open No. 63-175,198 and the like, and a sensor used in such a control device is disclosed in Japanese Patent Application Laid-Open No. 61-195,303. An outline is disclosed in a gazette and the like.

FIG. 4 is a configuration block diagram of a conventional system having a plurality of frames. Here, two frames # 1 and # 2
Are installed in the direction of paper flow. Usually, a dryer or a coating machine is installed between these frames, and a change in paper quality due to these devices is detected. Each frame is installed in the width direction of the paper, along which the sensor travels. The basic operation of this sensor is that a sensor is first provided at a start point B. When a travel command is received, the sensor passes through the lower end L of the paper width to reach the upper end U, and then reciprocates between the upper end U and the lower end L. ing.
In this case, it is important to perform control called synchronous operation in order to accurately detect a change in paper quality. Synchronous operation is
This refers to a state in which the downstream sensor head scans along the trajectory scanned by the upstream sensor head.

FIG. 5 is an explanatory view of a conventional synchronous operation, in which (A) shows the trajectory of the upstream frame # 1, and (B) shows the trajectory of the downstream frame # 2. Each frame moves from the starting point B to the upper end U when receiving the traveling start command. It is assumed that the sensor of the upstream frame # 1 measures the point S of the paper at the upper end U. Thereafter, the upstream frame # 1 continues the scanning operation. The downstream frame # 2 is transport time (point S is the downstream frame #
2 means the time obtained by dividing the inter-frame interval 1 by the speed-measuring speed SPD.) The scan was started after the elapse of Tu, and the synchronous operation was performed.

<Problem to be solved by the invention> However, when the transport time Tu is much longer than the synchronization period Period (meaning one-way or round-trip scan time in a frame, which is a data handling unit of the paper machine controller). In the first case, the standby time of the downstream frame # 2 is mischievously increased, making it impossible to grasp the change state of the paper quality and increasing the unnecessary psychological burden on the operator.
There were challenges.

In addition, some hindrance to the running of the sensor occurs, and the two frames that have been operating synchronously have almost two to
A difference of about 50% may occur. In this case, in order to secure a strict synchronous operation, it is necessary to make the downstream side frame # 2 stand by about 80 to 50% in response to this difference. However, there is a demand for simply and quickly grasping the paper quality change state. However, there is a second problem that the waiting time is too long.

An object of the present invention is to solve such a problem and to provide a paper machine / coating machine control device that performs a synchronous operation with a short waiting time.

<Means for Solving the Problems> A first invention for solving the first problem has a frame placed on the upstream side and a frame placed on the downstream side of the paper manufactured by the paper making / coating process. The paper machine / coating machine control device that controls the traveling of the sensor so that the sensor of the downstream frame measures the location measured by the sensor of the upstream frame has the following configuration.

That is, the transport time determined by the papermaking speed of the paper to be manufactured and the interval between frames is compared with the synchronization period determined by the scanning speed of the sensor and the width of the paper to be manufactured, and a phase that is a fraction in units of the synchronization period is compared. And a synchronous control unit that waits for this phase time from the start of the sensor movement of the upstream frame and instructs the start of the sensor movement of the downstream frame.

A second invention for solving the second problem has a frame placed on the upstream side and a frame placed on the downstream side of the paper manufactured by the paper making / coating process, and the sensor of the upstream side frame is used for measurement. In the paper machine / coating machine control device which controls the traveling of the sensor so that the sensor of the downstream frame measures the place where the measurement is performed, the following configuration is adopted.

That is, in the forward synchronization mode in which the downstream frame sensor travels so as to follow the travel path of the upstream frame sensor, and in the travel mode, the downstream frame sensor travels in the direction opposite to the travel path of the upstream frame sensor. The reverse operation mode in which the start point and the end point in the paper flow direction substantially coincide with each other can be adopted in the synchronous operation mode.

When a delay or advance occurs in the sensor traveling of the upstream frame or the downstream frame, and a considerable deviation occurs with respect to a synchronization cycle determined by the scanning speed of the sensor and the width of the paper to be manufactured, the downstream frame And a synchronous control unit that waits for a time necessary for the change due to the deviation.

<Operation> Each component of the present invention performs the following operation. In the synchronization control unit of the first invention, in order to reduce the standby time of the downstream frame at the time of starting traveling and measure the synchronous operation while informing,
It waits for a time corresponding to a fraction of the transport time divided by the synchronization period, and then performs a normal scan.

The second invention deals with a case in which the sensor running is hindered for some reason during the synchronous operation and a considerable deviation occurs from the strict synchronous operation. Here, two types of forward synchronization mode and reverse synchronization mode are prepared, and when a considerable delay occurs, the waiting time is reduced by changing the mode of the synchronous operation.

<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, the upstream frame # 1 and the downstream frame # 2 are the same as those described in FIG. The transport time section 11 is for obtaining the transport time Tu from the papermaking speed SPD of the paper to be manufactured and the interval l between the frames, and may be calculated and input by the operator, or provided with a computing device to calculate from the papermaking speed. Is also good.
This transport time Tu is given by the following equation.

Tu = 1 / SPD (1) The synchronization period unit 12 obtains a scan time SCT determined from the scan speed of the sensor and the width of the paper to be manufactured, and obtains a synchronization period Period from this. This relationship is represented by the following equation, and one of them is specified.

Period = SCT (one-way scan) (2) = 2 × SCT (reciprocal scan) (3) The synchronous mode section 13 allows only the forward synchronous mode, or allows both the forward synchronous mode and the reverse synchronous mode to be adopted. Is specified. Here, the forward synchronization mode refers to a state in which the downstream frame sensor # 2 travels so as to follow the traveling locus of the upstream frame # 1. In the reverse synchronization mode, the downstream frame sensor # 2 travels in a direction opposite to the path along which the upstream frame sensor # 1 travels, and the start point and the end point in the paper flow direction in the travel are substantially matched. Details will be described later with reference to FIGS. 2 and 3.

The synchronization control unit 20 receives the transportation time Tu from the transportation time unit 11 and the synchronization period Period from the synchronization period unit 12, obtains a fractional phase time Tf in units of the transportation time Tu, and is given by the following equation. .

Tf = Tu−m × Period (4) where m is a positive integer and the phase time is 0 <Tf <Peri
od satisfied.

In addition, when the synchronization mode unit 13 allows the reverse synchronization mode to be adopted, the synchronization control unit 20 causes some trouble in the traveling of the sensor and causes a considerable deviation from the synchronization period Period (for example, the synchronization period). When about 10 to 50% of the period occurs, the synchronous operation mode is changed to make the downstream frame # 2 stand by. Waiting in the same mode is synchronized with Period
The standby between different modes is performed based on the synchronization cycle Pe.
Since it is performed based on half of the riod, the waiting time is short.

The operation of the device configured as described above will now be described. 2A and 2B are explanatory diagrams of the operation of the first invention, wherein FIG. 2A shows the trajectory of the upstream frame # 1, and FIG. 2B shows the trajectory of the downstream frame # 2. When each frame receives the traveling start command, the starting point B
To the upper end U. It is assumed that the sensor of the upstream frame # 1 measures the point S of the paper at the upper end U. afterwards,
The upstream frame # 1 continues the scanning operation. The downstream frame # 2 starts the scanning operation after the elapse of the phase time Tf calculated by the synchronization control unit 20. The time required for the point S to flow to the position of the downstream frame # 2 is not, in a strict sense, synchronous operation, but the time of the downstream frame # 2
Since the measured value at 2 is obtained, it is convenient for grasping the operating state. When the point S flows to the downstream frame # 2, it is in a state of scanning the sensors necessary for the synchronous operation.

3A and 3B are explanatory diagrams of the operation of the second invention. FIG. 3A shows the trajectory of the upstream frame # 1, and FIG. 3B shows the trajectory of the downstream frame # 2. The point measured in the upstream frame # 1 is A
It is assumed that normal scanning is still performed in the upstream frame # 1 thereafter. However, in the downstream frame # 2, the scanning of the sensor starts to be delayed, and if the scan is originally normal, the scan of the trajectory indicated by the broken line should be performed.
Admits that there is considerable delay. In this case, the sensor should be located at the point A since it was initially in the forward synchronization mode. Therefore, the sensor stops from the point B and waits until the position of the point C opposite to the point A in the flow direction. Then, the measurement is started at the point C or in the reverse synchronization mode. Such an operation is effective when in a stable operation state such as a steady state of the process. Within a range of about one scan time SCT, there is no large change in paper quality, so that a measurement result close to synchronous operation can be obtained.

In the above embodiment, an example of application to a process for the papermaking industry is shown, but the invention may be applied to a process for producing a plastic film.

<Effects of the Invention> As described above, according to the first invention, the downstream frame # 2 waits for the phase time Tf and starts scanning, so that the downstream frame # 2 can be started before the synchronous operation becomes possible. Can be obtained, and the amount of change in paper quality can be easily obtained by comparing with the data of the upstream frame # 1.

According to the second aspect of the present invention, even in a case where the scan in a frame is disturbed and the synchronous operation becomes difficult, the synchronous mode is changed to the reverse synchronous mode, and the synchronous operation is performed while reducing the waiting time. Driving can be secured.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG.
FIG. 3 is an operation explanatory diagram of the first invention, and FIG. 3 is an operation explanatory diagram of the second invention. FIG. 4 is a block diagram showing a configuration of a conventional system having a plurality of frames, and FIG. 5 is an explanatory diagram of a conventional synchronous operation. 11: transport time section, 12: synchronous cycle section, 13: synchronous mode section, 20: synchronous control section. Tu: transport time, Period: synchronization cycle, Tf: phase time.

Claims (2)

(57) [Claims] 1. A method according to claim 1, further comprising a frame provided on the upstream side of the paper manufactured by the paper making / coating process and a frame provided on the downstream side. In the paper machine / coating machine controller that controls the travel of the sensor to measure, the transport time determined by the papermaking speed of the paper to be manufactured and the interval between frames, and the scanning speed of the sensor and the width of the paper to be manufactured By comparing the determined synchronization cycle with the determined synchronization cycle, a phase time that is a fraction is determined in units of the synchronization cycle, and the synchronization that instructs the start of the sensor movement of the downstream frame after waiting for the phase time from the start of the sensor movement of the upstream frame. A control unit for a paper machine / coating machine, comprising: a control unit. 2. A method according to claim 1, further comprising a frame provided on the upstream side of the paper manufactured by the paper making / coating process and a frame provided on the downstream side. A forward synchronization mode in which a downstream frame sensor travels along a trajectory on which an upstream frame sensor travels, and a forward synchronization mode in which the upstream frame sensor travels along a trajectory of the upstream frame sensor. In the synchronous operation mode, the downstream frame sensor travels in a direction opposite to the traveling locus of the vehicle and the start point and the end point in the paper flow direction in the traveling substantially coincide with each other. A delay or advance occurs in the sensor traveling of the frame, and the synchronous period is determined by the scanning speed of the sensor and the width of the paper to be manufactured. Then, when a considerable deviation occurs, the synchronous control unit that changes the synchronous operation mode of the downstream side frame and waits for a time necessary for the change due to the deviation is provided. Paper machine / coating machine controller.