JP2021025997A - Temperature measurement system for conveyor, method of laying optical fiber for temperature measurement on conveyor, and jig used therefor - Google Patents

Abstract

To perform temperature measurement using an optical fiber with high precision even in application to a large-scale conveyor.SOLUTION: A temperature measurement system for conveyor comprises: an optical fiber which is laid along a conveyor to propagate light pulses made incident from a temperature measuring device, and also propagate Raman scattered light generated inside to the temperature measuring device, and a plurality of jigs which are arranged at a plurality of temperature measurement points on the conveyor, respectively, and wound with the optical fiber. The optical fiber is a continuous body connecting the plurality of jigs one after the other, and a winding length of the optical fiber around each jig is equal to or larger than sampling resolution of the temperature measuring device.SELECTED DRAWING: Figure 1

Description

The present invention relates to a conveyor temperature measuring system, a method of laying an optical fiber for measuring the temperature of a conveyor, and a jig used for these.

Conveyors, which are industrial machines, are widely used for continuously transporting raw materials, products, wastes, and the like. However, when there is a possibility that the temperature rises and causes a fire due to natural heat generation due to friction between flammable objects to be transported, it is essential to provide means for monitoring the temperature rise.

However, conveyors come in a variety of forms and sizes. For example, in a paper mill, a belt conveyor is used to convey wood chips as a raw material, but the total number of transport paths and return paths may reach several hundred meters to several kilometers. Suitable configurations for temperature detection on a conveyor of this scale include a temperature measuring device that emits an optical pulse, and Raman that is laid along the conveyor line and is generated inside by the incident of the optical pulse. An example is a system that measures a continuous temperature distribution over a long distance over the entire length of an optical fiber by providing an optical fiber that propagates scattered light to a temperature measuring device.

Here, Patent Document 1 includes a winding body formed by winding an optical fiber, a housing for accommodating the winding body, and optical connectors provided at both ends of the optical fiber of the winding body. An optical fiber sensor device is disclosed. Then, by arranging a plurality of the optical fiber sensor devices at a plurality of required temperature measurement spots on the conveyor, connecting the optical fiber serving as a crossover to the optical connector, and connecting the plurality of optical fiber sensor devices in series, the temperature is increased. A distribution measurement system can be constructed.

Japanese Unexamined Patent Publication No. 2016-183881

However, in such a system, it is inevitable that connection loss (light attenuation) will occur at the optical connector connection site. Further, since the scale of the conveyor is large and the attenuation becomes large as the number of optical fiber sensor devices increases, it is conceivable that highly accurate temperature measurement cannot be performed. Further, Patent Document 1 does not provide a clear guideline regarding the length (winding length) of the optical fiber forming the winding body in order to enable highly accurate temperature measurement.

Further, it is convenient that the temperature distribution can be measured using an optical fiber even in a small-scale conveyor, and it is desired to propose such a temperature distribution measurement system.

Therefore, an object of the present invention is to realize highly accurate temperature measurement of a conveyor regardless of the scale.

Therefore, the present invention includes an optical fiber laid along a conveyor, propagating an optical pulse incident from a temperature measuring device, and propagating Raman scattered light generated inside to the temperature measuring device, and a plurality of the conveyors. A plurality of jigs arranged at temperature measurement points and around which the optical fiber is wound are provided, and the optical fiber is a continuum in which the plurality of jigs are sequentially connected, and the optical fiber is connected to the jig. The winding length of is equal to or greater than the sampling resolution of the temperature measuring device.

Further, the present invention includes a step of arranging a plurality of jigs for winding an optical fiber at a plurality of temperature measuring points of a conveyor, propagating an optical pulse incident from the temperature measuring device, and Raman generated inside. An optical fiber for propagating scattered light to a temperature measuring device, which is a continuum, is sequentially connected to the plurality of jigs while being wound around the jig at a sampling resolution of the temperature measuring device or higher. There is a method of laying an optical fiber for measuring the temperature of the conveyor, which comprises a step.

Further, the present invention is a jig used in the temperature measuring system of the conveyor or the method of laying an optical fiber, and the wound portion of the optical fiber has a radius of curvature portion that is less than the allowable bending radius of the optical fiber. It is characterized by not having it.

According to the present invention, the number of connection points to which the optical fibers are connected is small, and in the jig, the required winding length of the optical fiber can be set to a desired distance between the jigs, regardless of the scale. It becomes possible to measure the temperature of the conveyor with high accuracy.

It is a schematic diagram for demonstrating the concept of this invention. (A) and (b) are explanatory views for demonstrating the relationship between the winding length of an optical fiber wound around a jig at a temperature measuring point and the measured temperature. It is a perspective view which shows an example of the conveyor to which one Embodiment of this invention is applied. It is sectional drawing for demonstrating the arrangement of the jig with respect to the conveyor of FIG. 3 and the winding mode of an optical fiber. It is a perspective view for demonstrating the arrangement of the jig with respect to the conveyor of FIG. 3 and the winding mode of an optical fiber. (A) and (b) are a side view and a front view of a jig used in one embodiment of the present invention, respectively. (A) and (b) are schematic views showing the connection mode of the optical fiber to the conventional jig and the jig according to one embodiment of the present invention, respectively. It is a perspective view which shows the other 1st example of the conveyor to which one Embodiment of this invention is applied. It is sectional drawing for demonstrating the arrangement of the jig with respect to the conveyor of FIG. 8 and the winding mode of an optical fiber. It is a perspective view which shows the other 2nd example of the conveyor to which one Embodiment of this invention is applied. It is a three-view drawing for demonstrating the mechanism of the conveyor of FIG.

Hereinafter, the present invention will be described in detail with reference to the drawings.

(Basic concept)
FIG. 1 is a schematic diagram for explaining the concept of the present invention. However, the figure is merely an example for the sake of explanation, and does not limit the actual positional relationship of the jig around which the optical fiber is wound, the winding state of the optical fiber, and the connection mode.

The present invention differs from the configuration of Patent Document 1 (see FIG. 7A) in the following points. That is, jigs 10 for winding optical fibers are arranged at various places (temperature measurement points) of the conveyor where temperature measurement is required, and each jig 10 is provided with a continuous optical fiber (for example, an optical fiber core wire is protected and heightened. (Sequentially coated with tensile strength fiber, external insertion, sheath, etc.) 20 is laid in a loop with respect to the temperature measuring device 30 and the conveyor while being wound over the required length. The temperature measuring device 30 which can have a known configuration has a light source of a pulse of laser light incident on the optical fiber 20. A part of the scattered light generated in the optical fiber 20 returns to the incident side as Raman scattered light, and is received by the temperature measuring device 30 in time series corresponding to the distance to the position. Further, the temperature measuring device 30 is a separation filter that separates Raman scattered light of anti-Stokes light and Stokes light, and a conversion that converts the ratio I1 / I2 of the intensity I1 of anti-Stokes light and the intensity I2 of Stokes light into temperature information. It has a vessel, etc.

In the illustrated example, the temperature measuring device 30 is connected to both ends of the looped optical fiber 20 via an optical switch 32, and the same optical fiber 20 is alternately temperature-measured from both ends. A double-ended method is adopted that eliminates the influence of the attenuation factor distribution by calculating one measurement result. However, if the length (measurement distance) of the optical fiber 20 is not long, the single-ended method may be adopted.

According to the configuration shown in FIG. 1, the number of connection points of the optical fiber 20 is basically two points for the optical switch 32 (one point for a single end), and the attenuation of light at the connection portion can be suppressed. As a result, even if the scale of the conveyor is large and the length of the optical fiber 20 laid in a loop is as long as 2 km, it is possible to measure the temperature with high accuracy. However, in consideration of maintainability, a required number of fusion points may be provided. In the example of FIG. 1, the optical fiber 20 is laid from the connection point 32L with the optical switch 32 toward the end of the conveyor path, and the portion 20L laid from the connection point 32R with the optical switch 32 toward the end of the conveyor path. It is divided into two parts with the portion 20R, and both are fused at a position 26 near the end of the transport path. In any case, the attenuation of light can be significantly suppressed as compared with the configuration of Patent Document 1 having two connection portions for each jig.

Next, the winding length of the optical fiber 20 around the jig 10 will be described.
As shown in FIG. 2A, in temperature measurement using an optical fiber, temperature information averaged is acquired for each distance interval (sampling resolution, also referred to as sampling interval) in which the temperature measuring device captures data. ..

Assuming that the sampling resolution is S (for example, 1 m) and the winding length is L (for example, 1 m), if the boundary of the sampling resolution coincides with the start point and the end point of the winding, the solid line in FIG. 2 (b). As shown in, the temperature acquired at that time represents the actual temperature at the temperature measurement point. However, if the boundary is in the middle of the wound portion, the sampling resolution also includes the non-wound portion, and as shown by the broken line in FIG. 2B, the temperature information obtained by averaging Does not exhibit the actual temperature.

Therefore, the minimum requirement for obtaining the actual temperature is to make the winding length L equal to the sampling resolution S, in which case the boundary of the sampling resolution is one at the start and end points of the winding. The optical fiber may be laid so that it is located at the measurement point. A more preferable condition is that the winding length L exceeds the sampling resolution S, and further, a preferable condition is that the actual temperature can be measured no matter where the boundary of the sampling resolution is located in the winding portion. , The winding length L is at least twice the sampling resolution S (at least 2 m if S = 1 m). In this way, by winding the optical fiber around the jig for the required length, the boundary of the sampling resolution is located at the winding part of the measurement point, and the actual temperature of the measurement point can be measured. It is possible to reduce the overall length of the optical fiber while guaranteeing the measuring ability.

The winding length does not have to be the same for all jigs. In short, it is sufficient that the required winding length is satisfied for all jigs, and there may be variations for each jig, for example, 2.2 m for one jig and 2.1 m for the next jig. .. Further, the winding direction can be appropriately determined, such as a clockwise direction for a jig and a clockwise direction for the next jig.

(First Embodiment)
FIG. 3 is a perspective view showing a large-scale belt conveyor that conveys wood chips as a raw material in a paper mill as an example of a conveyor to which one embodiment of the present invention can be applied. The figure shows the transport path side of the belt conveyor, the back of the figure is the transport start end side, and the front is the end side. FIG. 4 is a cross-sectional view taken along line IV-IV of the belt conveyor of FIG. 3, and FIG. 5 is an enlarged perspective view of a part of the belt conveyor of FIG. 3, which shows the arrangement of jigs and the optical fiber. It is a figure for demonstrating the winding mode.

A plurality of stays 52 and 54 are erected along the transport direction on the transport path side frame 50F of the belt conveyor 1. The stays 52 are provided on both sides of the transport path side frame 50F, and their respective tip portions are inclined toward the transport path F, and have a bearing 63a that pivotally supports one shaft end of the carrier roller 62. As shown in FIG. 4, one stay 54 is provided upright at a position at a predetermined distance from the base end of each stay 52, and each tip portion is provided at the other shaft end of the carrier roller 64. It has a bearing 63b that supports the shaft. Further, the stay 54 has a bearing 65 that pivotally supports each shaft end of the carrier roller 64. The height of the stay 52 is larger than the height of the stay 54, so that the carrier roller 62 is supported in an inclined state and the carrier roller 64 is supported in a horizontal state. The conveyor belt 40, which is a carrier, is made of an elastic material, and is held on the upper surface side by being regulated so that both ends are raised by the carrier rollers 62 on both sides and the carrier roller 64 in the center. The structure is such that the wood chip) C is centered to prevent it from falling.

On the return path R side of the belt conveyor 1, a plurality of one return roller 66 extending in a direction intersecting the return path is arranged along the return direction. The return roller 66 is pivotally supported on both sides of the return path R by bearings 67 at the tip of a stay 56 erected on the lower surface of the return path side frame 50R.

In the belt conveyor 1 as illustrated, the shafts of the carrier rollers 62 and 64 and the return roller 66 tend to generate heat. Therefore, in the present embodiment, the jig 10 is arranged at the tip of each of the structures near the shaft, that is, the stays 52, 54, and 56, and the optical fiber 20 is wound so that the appropriate temperature can be measured. .. In this section, the set of jigs attached to the tips of the stays 52, 54 and 56 is referred to as a jig set for convenience. Then, the set of jigs shown by the reference numerals 10а-1, 10а-2 and 10a-3 shown in the left part of FIG. 4 is referred to as the first jig set, and the reference numerals 10b-1 and 10b-1 shown in the right part are referred to. The set of jigs represented by 10b-2 and 10b-3 is referred to as a second jig set.

The optical fiber portion 20L is laid along one side (the left portion in FIG. 4) with respect to the longitudinal axis of the conveyor 1, and the optical fiber portion 20R is laid along the other side with respect to the longitudinal axis of the conveyor 1 (FIG. 4). It is laid along the right part). Then, as described above, the loop-shaped optical fiber 20 is formed by fusing the two in the vicinity of the end of the transport path of the conveyor 1.

That is, the optical fiber portion 20L connected to the optical switch 32 at the connection point 32L (see FIG. 1) sequentially connects the first jig set on the start end side of the transport path to the first jig set on the end side, and ends the transport path. It is fused to the optical fiber portion 20Ra in the vicinity of the portion. The optical fiber portion 20R sequentially connects the second jig set on the end side of the transport path to the second jig set on the start end side, and is connected to the optical switch 32 at the connection point 32R. The winding of the optical fiber 20La in each first jig set can be performed in the order of, for example, jigs 10а-1, 10а-2 and 10a-3. From the jig 10a-3, the optical fiber 20L may be connected to the jig 10a-1 of the first jig set in the next stage, or the jig 10a-3 may be connected to the jig 10a-3 in the next stage jig set. The winding may be performed in the order of 10а-2 and 10a-1. The jigs 10b-1, 10b-2 and 10b-3 of the second jig set can be wound in the same manner.

(Example of jig configuration)
6 (a) and 6 (b) are side views and front views showing a configuration example of a jig used in one embodiment of the present invention, respectively. The jig 10 of this example includes a rectangular mounting plate 12 for mounting the stays 52, 54, and 56 to the tip portions, a circular wound portion 14 for winding the optical fiber 20, and a circular wound portion 14. It has a circular flange 16 for preventing the optical fiber from falling off, which is arranged outside the wound portion 14. The jig 10 may be formed by combining these members formed separately, but may be integrally formed in advance.

Here, the stays 52, 54 and 56 are generally made of steel (channel steel or angle steel) and are sensitive to heat generated by the rollers or shafts. Then, in the jig 10, the members located in the heat conduction path, that is, at least the mounting plate 12, the bolt 17, and the wound portion 14, have good heat conductivity in order to correctly reflect the temperature of the shaft or stay. Formed from material.

The length of one side of the mounting plate 12 and the outer diameter of the flange 16 are larger than the outer diameter of the wound portion 14, so that the mounting space 12 and the flange 16 surround the outer peripheral portion of the wound portion 14. Is defined. The dimensional conditions of the wound portion 14 facing the winding space are as follows. An optical fiber generally has an allowable bending radius (for example, 30 mm), and if the radius of curvature when bent is less than the allowable bending radius, light guiding cannot be performed. Therefore, the radius of curvature of the winding portion 14 must be equal to or greater than the allowable bending radius.

Further, based on the gist of the present invention, the winding length (greater than or equal to the sampling resolution or at least twice the sampling resolution) should be secured in the winding portion 14, based on the winding length to be secured. The outer diameter dimension of the winding portion 14 and the number of windings are determined. In this example, as is clear from the figure, the number of turns is set to "4". When the sampling resolution is, for example, 1 m (1000 mm), if the outer diameter of the winding portion 14 is 90 mm, the winding length of more than 1130 mm, which is equal to or higher than the sampling resolution, is secured by winding four times. Further, if the winding length of at least twice the sampling resolution is to be realized, the outer diameter may be 160 mm.

The winding length is determined by the outer diameter dimension of the wound portion 14 and the number of windings. Since the dimensions of the jig 10 may be subject to spatial restrictions in which it is installed, the outer diameter dimension of the jig 10 or the wound portion 14 and the number of turns are determined based on the dimensions, and the desired winding length is determined. It can be realized. Further, the number of turns does not have to be an integer, and may be, for example, "2.5". Then, a mark 18 indicating that the desired winding length has been achieved, a coating, or a convex portion or a concave portion is provided on the internal measurement surface portion of the mounting plate 12 and / or the flange 16 facing the winding space. The operator may be able to recognize that the desired winding length has been secured when this is no longer visible.

The jigs do not have to have the same shape, dimensions and configuration, and may be appropriately changed according to the installation space. In this case, considering that the outer diameter dimension of the wound portion 14 may not be uniform, it is advantageous to provide a mark 18 or the like for recognizing that the desired winding length has been secured. Is.

Further, FIG. 6 illustrates a configuration in which the jig 10 is attached to the stays 52, 54 and 56 with a through bolt 17 penetrating the center of the wound portion 14, but the attachment mode can be appropriately selected. For example, it may be attached by a screw-in bolt, or it may be attached by welding, adhesion by a thermal conductive adhesive, or adsorption by magnetic force.

Further, it is preferable that the wound portion 14 has a circular shape because the distance from the center (the position of the bolt 17) to the wound optical fiber is the same at any position and a uniform temperature change is exhibited. .. However, the present invention is not limited to this, and the wound portion 14 may be elliptical or polygonal. However, it is strongly desirable that a radius of curvature less than the allowable radius is not generated. That is, the wound portion 14 should be formed so that there is no portion having a radius of curvature less than the allowable radius regardless of the shape.

The advantages of the jig 10 having the above configuration will be described with reference to FIG. 7. FIG. 3A shows a connection mode (crossover) of the optical fiber 20'to the optical fiber winding body 12' housed in the housing 10'when the optical fiber sensor device described in Patent Document 1 is used. It is a schematic diagram which shows. In each jig 10', the two optical connectors 14' project in the same direction, and when connecting the optical fiber 20'from one jig (left side) to the next jig (right side), the allowable bending radius of the optical fiber 20' In consideration of, it is necessary to avoid a connection such as a two-point chain line. However, depending on the positional relationship between the two jigs, it may be necessary to provide sufficient slack, and as a result, the amount of the optical fiber 20'used may increase.

On the other hand, when the jig 10 of the present embodiment is used, if the condition that the winding length to the wound portion 14 is longer than the required length is satisfied, the jig 10 is wound around the wound portion 14. At least one sampling resolution can be accommodated regardless of the position of the sampling resolution boundary in the optical fiber 20. Therefore, as shown in FIG. 7B, the optical fiber 20 is passed in an appropriate and substantially tangential direction or the winding direction is selected according to the positional relationship with the jig in the next stage. Can be connected in the shortest distance, and as a result, the effect of shortening the total length of the optical fiber can be expected.

(Second Embodiment)
In the first embodiment, an example in which the present invention is applied to measure the temperature of a belt conveyor has been described. However, the present invention is applicable to any type of conveyor, not limited to the belt conveyor described above, as long as the conveyor requires temperature measurement because heat generation becomes a problem.

FIG. 8 is a perspective view showing a large-scale pipe conveyor as another example of a conveyor to which the present invention can be applied. The figure shows the transport path F of the belt conveyor, and the back of the figure is the transport start end side and the front is the end side. FIG. 9 is a cross-sectional view taken along the line IX-IX of the belt conveyor of FIG. 8, which is a diagram for explaining the arrangement of jigs and the winding mode of the optical fiber.

The pipe conveyor 100 uses a set of rollers (for example, six rollers 1621-162-6 arranged corresponding to positions corresponding to the sides of a hexagon) to form a belt 140 made of an elastic member into a pipe shape. Transport goods in a regulated state. A set of rollers 1621-162-6 are arranged along the transport direction, but at the start and end of the transport, the upper part of the belt 140 is opened so that the article C can be received and discharged. The rollers 162-1, 162-2, 162-6 are not arranged. The return path R of the pipe conveyor 100 is also configured in the same manner as the transfer path F, and the belt 140 is returned to the starting end side of the transfer in a state where the belt 140 is regulated in a pipe shape by six rollers 1641-164-6.

Even in the pipe conveyor 100 as illustrated, the shafts of the rollers 1621-1162-6 and 1641-164-6 tend to generate heat. Therefore, in the present embodiment, jigs 10a-1 to 10a-3, 10a-5 to 10a-7; 10b-1 to 10b, respectively, are located near the shaft, for example, at positions between the rollers (positions corresponding to the corners of the hexagon). -3, 10b-5 to 10b-7 are arranged. Further, in the illustrated example, two jigs 10a-4 and 10b-4 are further arranged in the vicinity of the roller (162-4) at the lowermost position of the transport path (the most of the return path R). A jig may be similarly arranged on the upper roller (164-1)). Then, an optical fiber is wound around these jigs to measure the temperature. As in the description of FIG. 5, the set of jigs located on the left side of FIG. 9 is referred to as the first jig set, and the set of jigs shown on the right side is referred to as the second jig set.

The optical fiber portion 20L is laid along one side (the left portion in FIG. 9) with respect to the longitudinal axis of the conveyor 100, and the optical fiber portion 20R is laid along the other side with respect to the longitudinal axis of the conveyor 100 (FIG. 4). It is laid along the right part). Then, in the same manner as described above, the loop-shaped optical fiber 20 is formed by fusing the two in the vicinity of the end of the conveyor path.

That is, the optical fiber portion 20L connected to the optical switch 32 at the connection point 32L (see FIG. 1) sequentially connects the first jig set on the start end side of the transport path to the first jig set on the end side, and ends the transport path. It is connected to the optical fiber portion 20Ra in the vicinity of the portion. Then, the optical fiber portion 20Rb sequentially connects the second jig set on the end side of the transport path to the second jig set on the start end side, and is connected to the optical switch 32 at the connection point 32R. The winding of the optical fiber portion 20La in each first jig set can be performed in the order of, for example, jigs 10а-1 to 10a-7 (at the end, 10а-4 to 10a-7). From the jig 10a-7, the optical fiber 20L may be connected to the jig 10a-1 (or 10а-4) of the first jig set in the next stage, or the jig 10a-7 may be connected to the jig 10a-7 in the next stage. In the jig set, the jigs 10а-7 to 10a-1 (or 10а-7 to 10a-4) may be wound in this order. The jigs 10b-1 to 10b-7 constituting the second jig set can also be wound in the same manner.

(Third Embodiment)
In the first and second embodiments, an example in which the present invention is applied to measure the temperature of a belt conveyor has been described. However, the present invention is applicable to any type of conveyor, not limited to the conveyor using the belt described above, as long as the conveyor requires temperature measurement because heat generation becomes a problem.

FIG. 10 is a perspective view showing a small drive roller conveyor as another example of a conveyor to which the present invention can be applied. The figure shows an example of one drive roller conveyor, and the drive roller conveyors are connected and arranged so as to be continuous according to the required length of the transport path, such as a cardboard box or a bag. An article (not shown) having a stable shape such as the above is transported so as to pass through the upper transport path. FIG. 11 is a three-view view for explaining the mechanism of the drive roller conveyor of FIG.

In the drive roller conveyor 200, both ends of the rotation axes of a plurality of rollers 201 orthogonal to the transfer direction of the article to be conveyed in the direction indicated by the arrow in the drawing are rotatably supported by the left and right frames 205. The frame 205 is supported by a stand 206 at a desired height so that articles can be transferred at a height corresponding to the destination.

The drive roller conveyor 200 transmits a driving force to the drive shaft 215, which extends in the transport direction of the article and is rotatably supported by the couplings 215c on both ends, and the drive shaft 215 at the lower part of the frame 205. It is provided with a motor 210 for rotationally driving. The drive shaft 215 is fixed so that one sprocket 213 and a pulley 215p at a position corresponding to each roller 201 are integrally rotated, and the sprocket 213 has a chain 212 together with a drive shaft 211 of a motor 210. It is wound and connected, and a round belt 216 is wound and connected to the pulley 215p together with a pulley 202 fixed to one end of the roller 201.

As a result, the drive roller conveyor 200 transports the article placed on the upper portion in a desired transport direction by the roller 201 transmitting the drive force of the motor 210 via the drive shaft 215 to drive and rotate the roller 201.

Even in the drive roller conveyor 100 as illustrated, the shaft of the roller 201 that is rotatably supported tends to generate heat. Therefore, in the present embodiment, for example, jigs 10-1 to 10-n are arranged in the vicinity of the shaft of the roller 201 in the frame 205. Since the optical fiber 20L is wound around these jigs and laid (see FIG. 1), the temperature can be measured even at an approaching measurement point such as between rollers 201, and individual small-scale drive rollers can be measured. It can also be installed on the conveyor 200. Here, in the present embodiment, as shown in FIG. 1, the optical fiber portion 20L is laid by winding it around a jig 10 installed on one side of the roller 201, and the optical fiber portion 20R is laid so as to be linearly returned. The case will be described as an example, but the present invention is not limited to this, and the jig 10 may be installed on the opposite side of the roller 201 to lay the optical fiber portion 20R.

(Other)
The present invention is not limited to the above-described embodiments and modifications described elsewhere. For example, the dimensions, the winding length, and the number of windings of the wound portion of the optical fiber in the jig can be appropriately selected according to the sampling resolution of the temperature measuring device. Needless to say, the jig connection order in the jig set is not limited to the above.

Further, the object to which the jig is attached is not limited to the stay described above as long as it is a member in a position that sensitively reacts to heat generation of the roller or shaft. For example, a jig may be attached to the housing of the bearing. In addition, if there is a part other than the roller or shaft where temperature measurement is desired, a jig may be attached to the part. Further, the location of the temperature measuring device (or the connection point between the temperature measuring device and the end of the optical fiber) is also conveyed as described above as long as the optical fiber is laid over the entire conveyor. It is not limited to the starting side of.

1 Belt conveyor 10 Jig 12 Mounting plate 14 Winding part 16 Flange 18 Marked 20 Optical fiber 30 Temperature measuring device 40,140 Conveyor belt 52, 54, 56 Stay 62, 64, 66, 162-1 to 162-6, 162-1-162-6, 201 Roller

Claims (7)

An optical fiber laid along the conveyor that propagates the incident light pulse from the temperature measuring device and propagates the Raman scattered light generated inside to the temperature measuring device.
A plurality of jigs arranged at a plurality of temperature measurement points of the conveyor and around which the optical fiber is wound, and
With
The optical fiber is a continuum in which the plurality of jigs are sequentially connected.
The winding length of the optical fiber around the jig is equal to or higher than the sampling resolution of the temperature measuring device.
Conveyor temperature measurement system. The temperature measuring system for a conveyor according to claim 1, wherein the winding length is at least twice the sampling resolution. The conveyor has a roller that rotates and conveys the article so as to deliver the article, or a roller that supports a belt that is a carrier of the article to be held, and the jig is arranged in the vicinity of the roller or its shaft. The conveyor temperature measuring system according to claim 1 or 2. The temperature measuring system for a conveyor according to claim 3, wherein the jig is attached to a stay that supports a bearing for the roller. The process of arranging multiple jigs for winding the optical fiber at multiple temperature measurement points of the conveyor, and
An optical fiber for propagating an optical pulse incident from a temperature measuring device and propagating Raman scattered light generated inside to the temperature measuring device, and a continuous optical fiber is attached to the jig. The process of sequentially connecting to the plurality of jigs while winding at or above the sampling resolution of
A method for laying an optical fiber for measuring the temperature of the conveyor. A jig used in the temperature measuring system of the conveyor according to any one of claims 1 to 4 or the method for laying an optical fiber according to claim 5, wherein the wound portion of the optical fiber is the optical fiber. A jig characterized by having no radius of curvature portion that is less than the allowable bending radius of. The jig according to claim 6, further comprising a means for indicating that the optical fiber has been wound to satisfy the winding length.

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