JP2568703Y2 - Light source device in paper pulp measurement control system - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light source device of a B / M system widely used as a measurement control system for a paper making / coating machine in the pulp and paper industry.

[0002]

2. Description of the Related Art In recent years, a B / M (basis weight / moisture content) system has not only been used for monitoring and controlling a single process such as a paper making / coating machine, but also for centrally monitoring and controlling a series of processes including an adjusting finishing process. , And is used for overall management of the entire factory. That is, it constitutes an indispensable part of a wide range of systems linked with a high-level FA computer. For example, it is installed in the initial processing part of the system, and the measurement result of paper moisture content by a B / M meter is measured. Is utilized in the processing of the subsequent steps.

[0003] To measure the water content of paper, the light to be measured is irradiated alternately on the paper to be measured from a light source, the transmitted light of the paper is measured by a sensor, and the transmission intensity of the comparative light and the measured light is measured. Is generally measured by measuring the ratio of A halogen lamp is used as a light source of the moisture meter.

[0004]

At present, the life of a halogen lamp is the longest, even if it is the longest.
Although it is on the order of hours, the lamp life varies from lamp to lamp, so it is not possible to predict when the lamp will run out. Therefore, when the lamp burns out, the measurement is interrupted until the lamp is replaced with a new lamp. In this case, not only the partial measurement process is interrupted, but also the entire system as described above. There is a great risk that this will lead to a stoppage of the processing, and there is a problem in operating efficiency.

The present invention has been made in consideration of such problems, and its purpose is to provide a countermeasure so as not to hinder the operation even if the lamp burns out. An object of the present invention is to provide a light source device capable of providing a space.

[0006]

The outline of a typical light source device of the present invention is as follows. That is, at least two light sources (and optical paths) each including an ellipsoidal mirror on which a lamp is disposed and a parabolic mirror for collimating light from the light source are provided.
A set is prepared, each of which has a line- symmetrical form, and a parabolic mirror for parallelizing light forms one common optical path. One lamp is used as an auxiliary lamp.

Further, a lamp burn-out detection circuit, switching means for switching to an auxiliary lamp when the lamp burn-out is detected,
It is composed of a host computer that executes a calibration operation of the optical sensor when the lamp is switched.

[0008]

[Operation] A spare lamp is prepared, the operating current of the light source used is constantly monitored, and if the current stops, the spare lamp is immediately switched to the spare lamp and the sensor is calibrated. However, the operation efficiency of the system does not decrease.

Further, there is a concern that the apparatus becomes complicated and the apparatus becomes larger due to the installation of a spare lamp, the addition of a new optical path, and the like. In addition, a common use of a parabolic mirror and a common optical path can minimize the increase in space.

Further, since the switching to the auxiliary lamp is performed automatically, no burden is imposed on the operator, and the maintenance work is also facilitated.

[0011]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram for explaining a configuration of an embodiment of the present invention.

The light source unit 1 of the present embodiment includes elliptical mirrors 50 and 5.
1 and parabolic mirrors 60 and 61 are combined, and the halogen lamps 40 and 41 are elliptical mirrors 50 and 51.
Is fixed at one focus position A, and the other focus B is
It is the focal position of parabolic mirrors 60 and 61 .

The operating current of each of the lamps 40 and 41 is detected by galvanometers 20 and 21, respectively, and amplifiers 30 and 3 are used.
1 through a one-chip microcomputer (MP shown in FIG.
U6) is sent out as a signal for detecting lamp burnout. The galvanometers 20 and 21 and the amplifiers 30 and 31 constitute a lamp burnout detector 2.

The lamps 40 and 41 can be switched by a relay 10, and the relay 10 is controlled by a lamp switching signal EX (transmitted from an MPU 6 in FIG. 2 described later).

FIG. 2 is a diagram showing an example of a main configuration of a B / M system using the light source unit 1 of FIG. The light from the light source unit 1 is applied to the paper 3, and the transmitted light intensity is detected by the sensor 4. The detection signal is converted into a digital signal by an A / D converter 5 and input to a one-chip microcomputer (MPU) 6. The host computer 7 comprehensively controls the operation of the system, and is equipped with software for automatically calibrating the sensor upon lamp replacement.

Next, the operation of the configuration shown in FIG. 2 when replacing the lamp will be described with reference to FIG. First, when the lamp-off detector 2 detects lamp current-off (lamp-off) (step 100), a detection signal _VA is sent to the MPU 6, and
In response to this, the MPU 6 issues a switching signal EX (step 101), whereby the relay 10 is switched, and the lamp is switched to the auxiliary side (step 102).

In parallel with this, the MPU 6 sends an alarm A _M to the host computer 7, and at the same time, invalidates the data after the lamp switching obtained from the sensor 4 (step 104). On the other hand, the host computer 7 outputs the sensor calibration signal V
_B to make the sensor calibrate (step 10
5).

In this embodiment, one auxiliary lamp is provided. However, the present invention is not limited to this. The number of elliptical mirrors and lamps can be further increased to extend the maintenance cycle.

[0019]

[Effects of the Invention] As described above, the present invention realizes a light source device having a simple configuration having an auxiliary lamp, thereby preventing a measurement due to a burnout of a lamp, preventing interruption of system operation, and facilitating maintenance. There is an effect that can be done.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a configuration of an embodiment (light source unit 1) of the present invention.

FIG. 2 is a diagram showing a configuration example of a main part of a B / M system using the light source unit 1 of FIG.

FIG. 3 is a flowchart showing an operation procedure at the time of lamp replacement of the configuration of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Light source part 2 Lamp burnout detector 20, 21 Current detection circuit 40, 41 Halogen lamp 50, 51 Elliptical mirror 60, 61 Parabolic mirror

Claims (1)

(57) [Scope of request for utility model registration] 1. A light source device used in a paper pulp measurement control system, comprising: first and second ellipses arranged symmetrically with respect to a line.
Plane mirrors and first and second parabolas connected to these ellipsoidal mirrors
Two light source optical paths formed by a surface mirror;
1, at one of the two focal points of the second ellipsoidal mirror
Each is provided, one of them is an auxiliary lamp when the other lamp goes out
First and second lamps configured to be used as
A light source and a lamp burnout of the first or second lamp light source
Lamp detection means for detecting
Outputs an alarm to the higher-level control means based on the output of the means
And switching means for switching to the other lamp light source.
The other focal point of the first and second elliptical mirrors
1, placed so as to be the focal point of the second parabolic mirror,
The light source device in the paper pulp measurement control system , wherein the control means performs sensor calibration for a lamp newly lit by switching the lamps in response to the alarm .