JP3404976B2 - Conveyor temperature monitoring device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conveyor temperature monitoring device capable of determining and displaying an abnormal temperature rise of a conveyor by utilizing Raman scattered light from an optical fiber.

[0002]

2. Description of the Related Art For example, when carrying a load of coal or the like on an endless belt conveyor, the load is carried on a belt part on the outward side of the upper part and carried to a predetermined place, but the belt part which has finished carrying the load is , Is moved to a lower position of the forward belt portion, and returns to the base end position while moving on the lower return belt.

On the return side of the belt conveyor, the surface on which the belt portion on the forward side is loaded faces downward. For this reason, when a part of the load such as coal to be conveyed adheres to the forward belt part, the adhered load moves downward when the belt part moves on the return roller. May fall and accumulate along the bottom of the belt conveyor.

At this time, when the height of the accumulated dropped load reaches the height of the return roller, friction occurs between the dropped load and the return roller or between the dropped load and the belt portion on the return side, and this friction causes the belt conveyance power. Will increase, or the temperature of dropped cargo will rise abnormally.

For this reason, it has been considered that an existing temperature sensor utilizing a thermocouple or a change in electric resistance is provided along the conveyor to detect the temperature state of the dropped load.

[0006]

However, in the temperature monitoring system as described above, the monitoring space becomes large when the conveyor extends over a long distance (for example, about several hundred m to 1,000 m). Therefore, there are drawbacks such that it is difficult to limit the location of abnormal temperature, and malfunctions often occur.

The present invention has been made in view of the above circumstances, and is a conveyor temperature monitor capable of accurately detecting an abnormal temperature rising location with high accuracy even if the apparatus has a simple structure and extends over a long distance. The purpose is to provide a device.

[0008]

In order to achieve the above object, in the present invention, necessary information on temperature is obtained from an optical fiber sensor section arranged along a conveyor and scattered light sent from the optical fiber sensor section. , A control unit that determines at which position of the conveyor the abnormal temperature rise is based on the temperature information sent from the measurement unit, and a display unit that displays the information determined by the control unit And a plurality of the optical fiber sensor units are installed below the return roller that feeds the belt unit on the return side of the conveyor at intervals in the width direction.

In the present invention, the optical fiber sensor section is characterized in that a metal tube is arranged around the optical fiber core wire.

The present invention is characterized in that a plurality of the optical fiber sensor portions are provided above the return roller at intervals in the width direction.

[0011]

According to the present invention, only the information on the temperature is taken out from the scattered light sent from the optical fiber sensor unit by the measuring unit, and the abnormal temperature rise to any position on the conveyor is made by the control unit based on the taken temperature information. It is determined whether or not there is, and the information determined by the control unit is displayed on the display unit.

Here, the optical fiber sensor portion is provided below the return roller, and the portion below the return roller is a portion where the dropped load accumulates. Usually, the friction between the dropped load and the return roller or the belt conveyor. When an abnormal temperature rise is caused by, it can be observed first at or near the unloading area. Therefore, the abnormal temperature rise can be detected early. Further, since a plurality of optical fiber sensor units are provided, by comparing the correlations of the temperatures detected from the optical fiber sensor units, it is possible to remove disturbances such as the ambient temperature and during operation, and detect the abnormal temperature rise with high accuracy.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, a belt conveyor 3 is used to convey the coal sent from the coal unloading berth 1 to a boiler 2 for thermal power generation via a coal storage yard 30, and the conveyor temperature of the present invention is used for this belt conveyor 3. The monitoring device 4 is incorporated. In addition, 30a shows a coal management room.

FIG. 2 is a cross-sectional view showing a specific structure of the belt conveyor 3. As shown in this figure, the endless belt conveyor 3 is supported by a belt conveyor frame 6. Specifically, the supply rollers 7, 7, 7 divided into three in the upper part of the belt conveyor frame 6,
The central supply roller 7 is provided horizontally, and the left and right supply rollers are provided so as to be inclined obliquely so as to gradually rise toward the left and right ends, respectively, and below the supply rollers 7, 7, 7. The return roller 8 is provided horizontally. The endless belt conveyor 3 is supported by the supply roller 7 and the return roller 8, and the rollers 7 and 8 are also provided.
Of the endless belt conveyor 3 by rotating all or some of the rollers 7 and 8
Is rotated.

In FIG. 2, reference numeral 11 (11A, 11B,
, 11I) shows an optical fiber sensor unit arranged along the belt conveyor 3, and the optical fiber sensor unit 11 is one of the elements constituting the conveyor temperature monitoring device 4. The optical fiber sensor unit 11 is provided in two stages above and below the return roller 8 so as to surround the return roller 8 with a predetermined distance from the return roller 8. The upper stages 11A, 11D, 11G in the horizontal direction and the lower stages 11B, 11E, 22H are spaced apart from each other in the width direction, for example, as a set of three, and the left end of the return roller 8
It is positioned and installed by a bracket (not shown) so as to correspond to the central portion and the right end portion. Further, the optical fiber sensor parts 11C, 11F, 11I are also laid right above the base part 12 of the belt conveyor 3. 1
Reference numeral 3 denotes the unloaded coal that has fallen from the belt portion 6a on the return side and is deposited on the base portion. Also, 14A is an upper cover,
14B shows lateral covers, and these covers 14A and 14B
Is detachably attached so as to cover the belt conveyor 3.

As shown in FIG. 3, the optical fiber sensor section 11 has a structure in which an outer circumference of an optical fiber core wire 19 composed of a core 15, a clad 16, a primary coating 17, and a secondary coating 18 is covered with a metal tube 20. . Optical fiber core wire 19
The metal tube 20 is covered in order to prevent the optical fiber core wire 19 from being cut or damaged due to contact with the transported object. It also has the meaning of improving weather resistance. The metal tube 20 may of course be a Teflon sheath metal tube or a vinyl sheath metal tube.

FIG. 4 shows an outline of the conveyor temperature monitoring device according to the present invention. In this figure, reference numeral 21
Is a measurement unit for extracting temperature-related information from the information sent from the optical fiber sensor unit 11, and 22 is a measurement unit 21.
It is a control unit composed of, for example, a personal computer or the like, which judges which position on the belt conveyor 3 has an abnormal temperature rise based on the temperature information sent from it. The control unit 22 includes a hard disk 23, a display 24 which is a display device,
And the printer 25 are respectively connected. The measuring unit 21, the control unit 22 and the like are arranged in the management room 30a, and the measuring unit 21 is connected to the optical fiber sensor unit 11 via the optical fiber cable 26.

In the measuring section 21, as shown in FIG. 5, an optical demultiplexer 21a is connected to the optical fiber cable 26, a laser light source 21b is connected to the optical demultiplexer 21a, and a pulse control circuit 21c is connected to the laser light source 21b. Further, the optical demultiplexer 21a includes a photoelectric switch 21d and an amplifier circuit 21e.
The averaging device 21f is connected via
f is connected to the control unit 22.

Next, the operation of the conveyor temperature monitoring device having the above structure will be described. Laser light source 21b of the measuring unit 21
Emits a high output pulse while being controlled by the pulse control circuit 21c, and the high output pulse enters the optical fiber sensor unit 11 via the optical demultiplexer 21a and the optical fiber cable 26. The optical fiber sensor unit 11 generates scattered light at each passing position when the light pulse propagates.

Part of the generated scattered light returns to the optical fiber cable 26, which is the incident end, as backscattered light. Then, of these backscattered lights, the anti-stalk light and the Stokes light are demultiplexed into the optical demultiplexer 21a.
The signals are demultiplexed by, and they are guided to the photoelectric converter 21d to be converted into electric signals. The converted electric signal is amplified by the amplifier circuit 21.
After amplification in e, the averaging device 21f further performs averaging processing a number of times to improve the S / N ratio, and then sends it to the control unit 22.

The control unit 22 calculates the intensity ratio of the anti-stalk light and the Stokes light and obtains the temperature of the place where the optical fiber sensor unit 11 is installed from the calculated value. It should be noted that which position of the optical fiber sensor unit 11 the measured position corresponds to is determined by measuring the delay time of the backscattered light returning to the incident side. Finally, as shown in FIG. 6, the belt conveyor 3 having the optical fiber sensor unit 11 laid at predetermined intervals.
The temperature distribution in the vicinity is obtained. In FIG. 6, A, B,
C, ... Represents the optical fiber sensor units 11A, 11B, ..., 11I laid at respective predetermined positions in FIG. A cross-sectional position at a predetermined distance from the connecting portion, in other words, a cross-sectional position corresponding to a predetermined distance from one end of the belt conveyor 3 (see FIG. 1).
reference). The obtained temperature distribution data is displayed on the display 24.
Is displayed and displayed by the printer 25.

Here, the optical fiber sensor portion 11 is provided so as to surround the return roller 8, but the portion below the return roller 8 is a portion where a drop of coal or the like is accumulated, as shown in FIG. When an abnormal temperature rise occurs due to friction between the unloading load and the return roller 8 or the belt conveyor 3, it is the first observable portion at or near the unloading portion. As a result, as described above, the optical fiber sensor unit 1 laid under the return roller 8
By 1, the abnormal temperature rise can be detected early.

Further, since a plurality of optical fiber sensor units 11 are provided, by comparing the correlations of the temperatures detected from them, it is possible to remove the ambient temperature and disturbances during operation, etc. Accurate detection of abnormal temperature rise is possible.

In the above embodiment, the belt conveyor for carrying coal is explained as an example, but the present invention is not limited to this, and the present invention can be applied to the case of carrying other things such as grains. is there.

[0025]

According to the present invention, since the optical fiber sensor is provided below the return roller where an abnormal temperature rise can be seen at an early stage, the abnormal temperature rise can be accurately detected in the initial stage. Also, because multiple optical fiber sensor units are provided, by comparing the correlations of the temperatures detected from them, it is possible to easily remove disturbances such as ambient temperature and during operation, and highly accurate detection of abnormal temperature rise. Can be done. In addition, laying a plurality of optical fibers can be much simpler than the case where a plurality of temperature sensors are arranged at a predetermined distance along the belt conveyor.

[Brief description of drawings]

FIG. 1 is a schematic plan view illustrating a belt conveyor in which a conveyor temperature monitoring device of the present invention is incorporated.

FIG. 2 is a cross-sectional view of a belt conveyor showing an installed state of an optical fiber sensor unit.

FIG. 3 is a cross-sectional view of an optical fiber sensor unit.

FIG. 4 is a schematic configuration diagram showing a conveyor temperature monitoring device of the present invention.

FIG. 5 is a block diagram showing a structure of a measuring unit.

FIG. 6 is an explanatory diagram showing temperature measurement positions.

[Explanation of symbols]

3 belt conveyor 4 Conveyor temperature monitoring device 7 supply rollers 8 Return roller 11 Optical fiber sensor 13 coal 21 Measuring unit 22 Control unit 23 hard disk 24 display 25 printers 26 Fiber Optic Cable

Claims (3)

(57) [Claims] 1. An optical fiber sensor unit arranged along a conveyor, a measuring unit for extracting only necessary information about temperature from scattered light sent from the optical fiber sensor unit, and a temperature sent from the measuring unit. A return roller that sends a belt portion on the return side of the conveyor , which includes a control unit that determines which position of the conveyor has an abnormal temperature rise from the information and a display unit that displays the information determined by the control unit. Drop
Abnormal temperature generated by friction with load or
Due to the friction between the bare belt and the load from the conveyor.
In order to detect the abnormal temperature caused by
The bar sensor section has a width below the return roller.
A conveyor temperature monitoring device characterized in that multiple units are installed at intervals in the direction . 2. The conveyor temperature monitoring device according to claim 1, wherein the optical fiber sensor section is configured by arranging a metal tube around an optical fiber core wire. 3. The conveyor temperature monitoring device according to claim 1, wherein a plurality of the optical fiber sensor units are installed above the return roller at intervals in the width direction. Temperature monitoring device.