JP2830217B2 - Sensor operation control device - 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, three frames are installed in the paper flow direction, and a dryer or a coating machine is usually installed between these frames to detect a change in paper quality due to these devices. Each frame is installed in the width direction of the paper, along which the sensor travels. In this case, it is important to perform control called synchronous operation in order to accurately detect a change in paper quality. Synchronous operation refers to a state in which a downstream sensor head scans along a locus scanned by an upstream sensor head.

Conventionally, one master station (BFCS) returns the return timing and transport time of the scanning operation of each frame (# 0 to # 2) (the time required for a specific location of paper to be sent from a specific frame to another frame). ), And synchronous operation was performed by performing batch management by a return start command.

<Problems to be Solved by the Invention> However, in the conventional device, since one master station performs collective management, there is the following problem.

The size of the synchronization buffer for transport time compensation must be large.

The load such as the amount of coating between synchronization frames is large for the master station.

If the master station goes down, synchronous operation becomes impossible and the entire system will not function.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide a sensor operation control device in which loads such as a synchronization buffer and a coating amount calculation are dispersed to avoid concentration in one place.

<Means for Solving the Problems> The present invention for achieving the above object is to independently start the return of the self-sensor and to provide the most upstream frame having the following informing means, the following informing means, and transportation time calculation. Means and an intermediate frame having sensor scanning command means;
It is characterized by comprising the following transport time calculating means and the most downstream frame having a sensor scanning command means.

Here, the notification means is for notifying the start of the return of the self-sensor to the connected downstream frame,
The transport time calculating means calculates the transport time from the interval with the upstream frame and the speed of the combined frame, and the sensor scanning instruction means uses the transport time calculating means from the return start of the sensor of the connected upstream frame. After the elapse of the obtained transport time, the self-sensor starts to turn back.

<Operation> Each component of the present invention performs the following operation. The paper machine / coater controller has a plurality of frames. For a specific frame, which frame is upstream and which frame is downstream is assigned based on the paper feeding direction. In addition, a notification unit, a transportation time calculation unit, or a sensor scanning instruction unit is provided according to whether or not an upstream / downstream frame exists in a specific frame.

<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, three frames are provided for the paper machine / coating machine to be controlled, and the numbers are # 0 and # from the upstream side.
Attach 1, # 2.

Embodiment 1 Synchronous coupling 1A is provided between frames # 0 and # 1, and synchronous coupling 2A is provided between frames # 1 and # 2. Frame # 0
Is the most upstream frame, so it independently starts the self-sensor turning back and has the notifying means RA0. Since the frame # 1 is an intermediate frame sandwiched between the frames # 0 and # 2, the frame # 1 has the notifying means RA1, the transport time calculating means LA1, and the sensor scanning command means SA1. Since frame # 2 is the most downstream frame, it has transport time calculation means LA2 and sensor scan command means SA2.

The informing means RA0 and RA1 inform the downstream frames # 1 and # 2 connected thereto of the return start of the self-sensor, and include a transmitter. Transport time calculation means
LA1 and LA2 are connected upstream frames # 0 and #
Intervals L1 and L2 from 1 are stored, and the transport times τ1 and τ2 are calculated using the papermaking speed υ separately sent from the control device. The sensor scanning instructing means SA1 and SA2, after the return of the sensors of the upstream frames # 0 and # 1 respectively connected, start the transport time τ1 and τ2 calculated by the transport time calculating means LA1 and LA2 of the own frame. Instructs the sensor to start turning back. That is, the transport time calculation means LA1, LA2 and the sensor scan command means SA1, SA2 have a device for receiving the transmission from the notification means RA0, RA1, and the sensor scan command means.
SA1 and SA2 have devices for sending commands to the sensor traveling drive device.

The operation of the device configured as described above will now be described. 2A and 2B are explanatory diagrams of the running state of the sensor in each of frames # 0 to # 2. FIG. 2A shows # 0, FIG. 2B shows # 1, and FIG. 2C shows # 2. In the figure, when frame # 0 starts to turn back, the timing is notified to frame # 1. Next, the frame # 1 starts to return after the synchronization waiting time τ1 has elapsed from the timing of receiving the notification. Here, when frame # 1 starts to turn back, the timing is notified to frame # 2. next,
In frame # 2, the return is started after the synchronization waiting time τ2 has elapsed from the timing of receiving the notification.

In the figure, the trajectory of frames # 0, # 1, and # 2 is the frame interval L
It is arranged in consideration of 1, L2. A dotted line obliquely traversing each frame indicates the time when the point measured in frame # 0 reaches downstream frames # 1 and # 2. The dashed line indicates the timing of the sensor traveling required for performing the synchronous operation, and clearly indicates the synchronization waiting time.

Next, a case where scanning of the first frame # 0 takes time for some reason will be described.

Now, a scan delay occurs in frame # 0,
Suppose that the sensor head reaches a predetermined position at the paper edge in frame # 0. Even in such a case, since the papermaking speed V does not often change, in most cases, the synchronization waiting times τ1 and τ2 remain unchanged. Then, when the scanning of the frame # 0 is started, a return start notification for the frame # 1 is issued at the start of the scanning, so that the frame # 1 has the synchronization waiting time τ
A return is started after the lapse of one, and a return start notification is made for frame # 2. As described above, even when the previous scan of frame # 0 takes a long time, the scan of the current time is not affected, and the autonomy of the system is not lost.

Next, the configuration of such a distributed station will be described in comparison with a conventional centralized station. In general, an arithmetic and control unit (not shown) is required to observe the change in paper quality in the process. To perform the synchronous operation, the upstream frame corresponding to the transport time τ between the upstream frame is required. A synchronous buffer for temporarily storing measurement data, and an arithmetic unit for obtaining an operation state from the data in the synchronous buffer and the measurement data of the own frame are required. Therefore, it is assumed that there are four types of data necessary for calculating the amount of change in paper quality, for example, the amount of coating, and the capacity of the synchronous buffer is eight scans. The synchronization buffer size for one scan is set to 720 bytes corresponding to 360 measurement points, and the number of frames is set to N.
(= 8).

Synchronous buffer size is 645kB ｛= 4 for centralized type
(Seed) × 8 (scan) × 720 (bytes) × _N C2 、, and the number of coating amount calculations is 40320 ｛= 4 (seed) × 360 (data) × _N C ₂ ｝ times. There is a problem that the number of data is too large to process at the station scale.
Therefore, when adopting the distributed type, if the stations are provided in one-to-one correspondence with the frames, the size of the synchronization buffer and the number of operations of the coating amount become clear at 1 / N. The number of man-hour operations is 5040, which is advantageous in a system with a large number of synchronization frames.

Embodiment 2 Returning to FIG. 1, the description will be continued. Here is the frame #
An example in which a synchronous connection 2B is provided between 0 and # 2 is shown. Therefore, as shown in FIG.
Has no relation to the synchronous coupling 2B and is treated as if it did not exist.

As described above, when the intermediate frame # 1 is excluded from the synchronous operation, the measurement cannot be performed due to a sensor failure or the like, or the coating amount on the front and back of the paper has been conventionally measured due to a change in the paper brand. However, this time corresponds to the case where only the coating amount on one side of the paper is measured. Frame # 0
Is an upstream frame, so that the self-sensor starts to return independently and has a notification means RB0. Since frame # 2 is a downstream frame, the transport time calculation means LB2
And sensor scanning command means SB2.

The notifying unit RB0 notifies the linked downstream frame # 2 of the return start of the self-sensor, and includes a transmitter. The transport time calculation means LB2 stores the interval L1 + L2 with the upstream frame # 0 that is connected,
The transport time τ is calculated using the paper speed υ separately sent from the control device. The sensor scan command means SB2 instructs the self-sensor to start turning back after the lapse of the transport time τ obtained by the transport time calculating means LB2 from the start of turning back of the sensor in the upstream frame # 0 that is coupled.

The operation of the device configured as described above is similar to the relationship between the frame # 0 and the frame # 1 described in the first embodiment, and thus the description is omitted.

In the above embodiment, the case of a paper machine has been described as an example. However, the present invention is not limited to this, and may be an apparatus for controlling the thickness of a sheet (made of plastic or metal). The same applies.

<Effects of the Invention> As described above, according to the present invention, since the synchronous operation is performed between frames, the system becomes autonomous. Therefore, even if one frame goes down, it becomes possible to separate only the relevant frame and perform synchronous operation using another normal frame.

Further, when a device for performing a synchronous operation is provided in a one-to-one correspondence with each frame as in the embodiment, the size and the amount of operation of the synchronous buffer of the distributed operation device are small, and the number of frames to be operated synchronously is small. There is an advantage that even if the number increases, the operation control device can be easily handled.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG.
FIG. 3 is an explanatory view of the running state of the sensor in each of frames # 0 to # 2, and FIG. 3 is an explanatory view of the synchronous connection 2B of FIG.
FIG. 4 is a configuration block diagram of a conventional system having a plurality of frames. R: notification means, L: transport time calculation means, S: sensor scanning command means.

Claims (2)

(57) [Claims] 1. An upstream frame which independently starts turning back of a sensor and has a notification means of the following (i), and a downstream frame having a transportation time calculation means and a sensor scanning command means of the following (ii) and (iii). An operation control device for a sensor, comprising: a frame; (I) notification means for notifying the start of turning back of the self-sensor to the coupled downstream frame; (ii) transportation time calculating means for determining the transportation time from the interval with the coupled upstream frame and the papermaking speed; (iii) ) Sensor scanning command means for starting the return of the self-sensor after the lapse of the transport time calculated by the transport time calculation means from the start of the return of the sensor of the coupled upstream frame. 2. The most upstream frame which independently starts turning back of the sensor and has the following notification means (i), the following notification means (i) to (iii), transportation time calculation means and sensor scanning command An operation control device for a sensor, comprising: an intermediate frame having means; and a lowermost frame having transport time calculation means and sensor scanning command means described in (ii) and (iii) below. (I) notification means for notifying the start of turning back of the self-sensor to the coupled downstream frame; (ii) transportation time calculating means for determining the transportation time from the interval with the coupled upstream frame and the papermaking speed; (iii) ) Sensor scanning command means for starting the return of the self-sensor after the lapse of the transport time calculated by the transport time calculation means from the start of the return of the sensor of the coupled upstream frame.