JP2006292736A - Method and device for measuring power loss of conveyer belt running over conveyor roller, and evaluation method of power loss of the conveyor belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a device for measuring the resistance of a conveyor belt running over the conveyor rollers, and also to provide an evaluation method of power loss for the conveyor belt, capable of measuring the running over the conveyor rollers and capable of easily explaining the generation mechanism of the resistance of running over the conveyor rollers without having to use an actual belt conveyor device. <P>SOLUTION: The plate 9 for preventing deflection is arranged on the testing area X of the belt conveyor W, and the conveyor rollers 10A for rolling along the belt conveyor belt W are arranged on the lower surface side, on the rolling surface 10a cantilevered strain gauge 21 is embedded, and the strain in the radial direction, generating at the surface of the conveyor roller 10A with rotation, is measured by the strain gauge 21. The tension side tension Ta and the loose side tension of Tb are detected by the load cells 7a and 7b on both the sides of conveyor belt W. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method and apparatus for measuring resistance force of a conveyor belt over a conveyor roller and a method for evaluating power loss of the conveyor belt, and more particularly, to occur in a conveyor roller in order to predict and reduce power consumption during operation of the conveyor belt. TECHNICAL FIELD The present invention relates to a conveyor roller overcoming resistance measurement method for a conveyor belt for measuring the overcoming resistance force, an apparatus thereof, and a method for evaluating the power loss of the conveyor belt for evaluating the power loss of the conveyor belt that occurs during operation.

  It is known that the power consumption for driving an endless belt in a conveyor line varies greatly depending on the type of belt, peripheral equipment such as driving rollers, and the weight of the material loaded on the belt. ing. From such a viewpoint, conventionally, many proposals regarding a conveyor belt for reducing power consumption during driving have been made. (For example, refer to Patent Documents 1 and 2).

  As a method of measuring at the laboratory level how the power consumption of the conveyor belt is affected by peripheral equipment and load weight, etc., as shown in FIG. Conveying trough type conveyors C, loading unshown objects and circulating and conveying them in the direction of the arrow while changing the conveying environment such as loading weight and belt speed, and consumption of pulley E on the drive side Measuring power fluctuations has been done.

  However, with this method, the weight of the transported material is scattered or dropped, and the weight gradually decreases. In the case of a transported material containing water or a water-absorbing transported material, the weight fluctuates during the measurement. Therefore, there is a problem that the measurement result of power consumption is not reliable. Furthermore, an error may occur in the measurement result of the power consumption due to the impact force when the conveyed product falls between these two conveyors, and this slight change in power consumption may be overlooked.

  Further, when the belt conveyor becomes a long machine length, the number of conveyor rollers relatively increases, so that power loss due to contact between the conveyor belt and the conveyor rollers becomes dominant. Therefore, it is an important issue to reduce the power loss that occurs when the conveyor roller gets over. However, since the conveyor belt comes into contact with the conveyor roller in a form close to a point contact, and the rotational resistance of the conveyor roller is almost zero, there is an unclear point about what causes the resistance at the conveyor roller. Many.

  The necessary conditions for predicting and reducing the power consumption during the operation of the conveyor belt include that it is possible to measure the overcoming resistance generated per conveyor roller, and the mechanism of the overcoming resistance of the conveyor roller. Is to elucidate.

  The method for measuring the power loss generated by one conveyor roller using an actual belt conveyor device is a method of averaging the power loss by the number of all conveyor rollers. In this method, it is unclear whether there is any change in the resistance of the conveyor roller overcoming due to the position of the conveyor roller (the tension of the conveyor belt immediately before passing through the conveyor roller). Furthermore, the value including the bending force of the conveyor belt and the resistance force generated at the roller bearing portion is measured.

  In addition, the distribution force acting on the conveyor belt when passing through the conveyor roller and the winding angle with the conveyor roller cannot be measured, and there is no choice but to rely on numerical simulation. Therefore, a conveyor roller using an actual belt conveyor device. It was difficult to measure the resistance force of overcoming and to elucidate the generation mechanism of the resistance force of overcoming the conveyor roller.

For this reason, there has been a problem that a proper evaluation cannot be performed for the power loss of the conveyor belt, and a method for efficiently reducing the power loss has not been established.
Japanese Patent Laid-Open No. 2004-18752 JP 2004-142926 A

  The present invention pays attention to such a conventional problem, and without using an actual belt conveyor device, easily measures the resistance of the conveyor belt overcoming the conveyor roller, and easily elucidates the mechanism of the conveyor roller overcoming resistance. It is an object of the present invention to provide a method for measuring the resistance force of a conveyor belt over a conveyor roller, a device for the same, and a method for evaluating the power loss of a conveyor belt that can appropriately evaluate the power loss of the conveyor belt that occurs during operation. is there.

  In order to achieve the above object, the invention provides a method for measuring the resistance of a conveyor belt over a conveyor roller, and measures the resistance of the conveyor belt overcoming the conveyor belt in order to predict and reduce power consumption during operation of the conveyor belt. This is a method for measuring the resistance force of a conveyor belt over a conveyor roller, in which a plate for preventing deflection is arranged on the upper surface side, and load cells are arranged on both ends, and a strain gauge is embedded on the rolling surface from the lower surface side of the conveyor belt. With the roller being pressed at a predetermined pressure, the conveyor roller is rolled along the longitudinal direction of the conveyor belt, and the tension on the conveyor belt and the tension on the loose side during the running of the conveyor roller are adjusted by the load cell. The conveyor roller is detected by a strain gauge embedded in the conveyor roller. Measures the radial strain generated on the surface along with the rolling of the conveyor roller, and measures the distributed force generated on the conveyor belt from the difference between the tension on the conveyor belt and the tension on the loose side and the strain measured by the strain gauge. This is the gist.

  Here, the difference between the tension on the tension side and the tension on the slack side of the load cells arranged at both ends of the conveyor belt is regarded as the resistance to cross over the conveyor roller.

  In addition, the conveyor belt overcoming resistance measuring device for a conveyor belt according to the present invention predicts and reduces the power consumption during operation of the conveyor belt, and measures the overcoming resistance generated in the conveyor roller. It is a force measuring device, and a plate for preventing deflection is arranged on both sides of the conveyor belt where load cells for measuring the tension and slack side tension of the conveyor belt are arranged at both ends, and on the lower side of the conveyor belt. A conveyor roller that can roll along the conveyor belt and that can move up and down is installed, and a strain gauge is embedded in a part of the rolling surface of the conveyor roller, and a radial direction generated on the surface of the conveyor roller by the strain gauge. The main point is to measure the distortion of the roller along with the rolling of the conveyor roller. .

  Here, the support shaft of the conveyor roller is provided with a load cell for measuring a vertical drag when the conveyor roller is pressed to the lower surface side of the conveyor belt, and the conveyor roller is attached to the conveyor belt via a traveling device. The strain gauge that is rolled along the conveyor roller and embedded in the conveyor roller has a part of the rolling surface of the conveyor roller formed in a cantilever shape.

  With such a configuration, it is possible to easily elucidate the measurement of the resistance force of the conveyor roller overcoming and the generation mechanism of the resistance force of overcoming the conveyor roller without using an actual belt conveyor device.

  The method for evaluating the power loss of the conveyor belt according to the present invention is a state in which the conveyor roller is pressed at a predetermined pressure from the lower surface side of the conveyor belt using the conveyor belt overcoming resistance measurement device for the conveyor belt described above. Until the contact point moves away from the conveyor belt from the point when the conveyor roller starts to contact the conveyor belt, according to a strain measurement value embedded in the conveyor roller. A contact relaxation time is calculated, a stress relaxation curve is calculated based on data acquired by a dynamic viscoelasticity test of the conveyor belt, and a power loss of the conveyor belt is calculated based on an inclination of the stress relaxation curve in the contact time region. It is characterized by evaluating.

Since the present invention is configured as described above, the following excellent effects can be obtained. (A) Without using an actual belt conveyor device, it is possible to easily measure the resistance to cross over the conveyor roller caused by the contact of the conveyor roller.
(B) When measuring the resistance force over the conveyor roller, it is possible to remove the influence of the deflection of the conveyor belt on the resistance force over the conveyor roller and the resistance force generated at the roller bearing.
(C) Distribution force (roller radial direction) generated in the conveyor belt can be measured by contact with the conveyor roller during belt running.
(D) It becomes possible to quantitatively evaluate the winding angle (contact time) between the conveyor belt and the conveyor roller. That is, it can be calculated from the number of data corresponding to the change in waveform output from the strain gauge.
(E) It is possible to easily change the diameter of the conveyor roller, the initial tension of the conveyor belt, the normal force acting on the conveyor belt, the type of the conveyor belt, and the like.
(F) By using the conveyor belt overcoming resistance measuring device, the contact time between the conveyor belt and the conveyor roller can be accurately calculated, and in the calculated contact time region that has a large effect on power loss. Since the inclination of the stress relaxation curve is an evaluation target, the power loss of the conveyor belt can be properly evaluated.

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

  FIG. 1 shows a schematic configuration diagram (plan view) of a conveyor belt overcoming resistance measuring device 1 (hereinafter referred to as measuring device 1) for carrying out the conveyor roller overcoming resistance measuring method of the present invention. In the schematic configuration diagram, a test was performed using a steel conveyor belt obtained by cutting a part of an endless belt of a belt conveyor device actually used as a conveyor belt W into a predetermined length.

  In FIG. 1, the measuring apparatus 1 has a pair of clamping means 3a and 3b for linearly clamping both ends of a conveyor belt W having a predetermined length on both ends on a flat frame 2 (upper frame). The clamp means 3a and 3b are constituted by the clamping plate 4, a plurality of fastening bolts 5 and the like, and are slidably mounted on the slide rails 6a and 6b.

  On the opposite side of the clamping means 3a, 3b to the clamping side, load cells 7a, 7b for detecting the tension side tension Ta and the loose side tension Tb of the conveyor belt W are installed. These load cells 7a, 7b are provided with adjusting screws 8a, The position can be adjusted with respect to the longitudinal direction of the conveyor belt W by 8b.

  On the upper surface side of the test area X of the conveyor belt W, a plate 9 for preventing bending such as fluororesin is arranged in parallel, and on the lower surface side of the conveyor belt W, rolling is performed along the conveyor belt W. A traveling device 10 of a conveyor roller 10A that can be moved up and down is installed.

  In this traveling device 10, a slide plate 13 is slidably mounted on two slide rails 12a and 12b arranged in parallel on the frame 2 and the frame 11 (lower frame). The plate 13 is screwed onto a screw shaft 14 disposed in parallel between the slide rails 12 a and 12 b on the frame 11 via bearing members 15 a and 15 b, and is rotated onto the slide rails 12 a and 12 b by the rotation of the screw shaft 14. It is comprised so that it may slide to the left-right direction along. A drive motor 17 that can be rotated forward or backward is connected to one end of the screw shaft 14 via a gear mechanism 16.

  A support shaft 18 is coupled to the screw shaft 14 between the bearing members 15a and 15b in a direction orthogonal to the screw shaft 14, and a conveyor roller 10A that rolls along one lower surface of the support belt 18 along the lower surface of the conveyor belt W. Is supported rotatably via a bearing member 19, and a load cell 20 for measuring a vertical drag is installed on the other end side of the support shaft 18.

  As shown in FIGS. 2 to 5, a strain gauge 21 is embedded in a part of the rolling surface 10 a of the conveyor roller 10 </ b> A, and the strain generated in the radial direction on the surface of the conveyor roller 10 </ b> A by the strain gauge 21 is transferred to the conveyor roller 10 </ b> A. Measurement is performed together with 10A rolling.

  The strain gauge 21 is attached in a cantilever shape to a recess 22 formed in a part of the rolling surface 10a of the conveyor roller 10A, and is connected to a measuring instrument (not shown) via a cord 23.

  Next, a method for measuring the resistance overcoming the conveyor roller 10 </ b> A using the measuring device 1 will be described.

  In the present invention, in order to predict and reduce the power consumption during operation of the conveyor belt W, the overcoming resistance force generated in the conveyor roller 10A is measured by the following method.

  First, the conveyor roller 10A in which the strain gauge 21 is embedded in the rolling surface 10a is pressed at a predetermined pressure P while measuring the vertical load by the load cell 20 from the lower surface side of the conveyor belt W in which the load cells 7a and 7b are arranged at both ends. In this state, the conveyor roller 10 </ b> A is rolled along the longitudinal direction of the conveyor belt W.

  In this embodiment, the drive motor 17 of the traveling device 10 is driven to rotate to rotate the screw shaft 14, thereby moving the conveyor roller 10 </ b> A in the direction of the arrow shown in FIG. 6 (from the load cell 7 a side of the tension side tension Ta to the loose side tension Tb). To the load cell 7b side). When the conveyor roller 10A travels, the tension tension Ta and the slack tension Tb of the conveyor belt W are detected by the load cells 7a and 7b, and the radial direction generated on the surface of the conveyor roller 10A by the strain gauge 21 embedded in the conveyor roller 10A. The load Fa is measured together with the rolling of the conveyor roller 10A.

  Then, the distribution force generated in the conveyor belt W is measured from the difference (Ta−Tb) between the tension side tension Ta and the loose side tension Tb of the conveyor belt W and the strain measurement value by the strain gauge 21.

  In the present invention, the difference (Ta−Tb) between the tension side tension Ta and the slack side tension Tb of the load cells 7a and 7b disposed on both sides of the conveyor belt W is regarded as the overcoming resistance force F generated in the conveyor roller 10A.

  Next, the method of measuring the resistance force for overcoming the conveyor roller of the present invention and the measurement result will be described with reference to FIGS. 6, 7A and 7B.

[Measure overcoming resistance]
In the measuring apparatus 1, the tension on the tension side Ta and the tension on the loose side Tb are detected by the load cells 7a and 7b arranged on both sides of the conveyor belt W, and the resistance force generated on the conveyor belt W when the conveyor belt 10A is overcome. (Conveyor roller overcoming resistance force) F was determined by the following equation (1).
F = Ta-Tb (N / m) (1)

  In FIG. 1, initial tension and vertical drag were applied by rotating the adjusting screws 8a and 8b to give a forced displacement. A plate 9 for preventing deflection of fluorine resin or the like is fixed to the back surface (upper surface) of the conveyor belt W, the resistance due to the deflection of the conveyor belt W is removed, and fluorine (not shown) is interposed between the conveyor belt W and the plate 9. The friction force was reduced by interposing a plurality of resin sheets.

  Then, as described above, the radial load Fa generated on the surface of the conveyor roller 10A by the strain gauge 21 embedded in the conveyor roller 10A during the running of the conveyor roller 10A is measured together with the rolling of the conveyor roller 10A, and is shown in FIG. The relationship with the angle θ was determined.

[Measurement result]
The relationship between the vertical drag acting on the conveyor belt W when the conveyor roller 10 </ b> A having the strain gauge 21 gets over and the change in the radial load of the conveyor roller 10 </ b> A acting on the conveyor belt W is shown in FIG. FIG. 7A shows a curve for each drag. As is clear from FIG. 7A, the peak point D of the load distribution in the radial direction of the conveyor roller W shifts to the loose side as the vertical drag increases (each curve shifts downward) (hereinafter, It can be seen that the load distribution is asymmetric.

  Here, the value of the sum Fx of the component force in the longitudinal direction of the conveyor belt W of the load in the radial direction of the conveyor roller 10A is calculated, and the resistance force (conveyor generated on the conveyor belt W when the conveyor belt 10A is overcome) Roller overcoming resistance) F.

  The result is shown in FIG. From FIG. 7B, it was found that the actually measured resistance force (conveyor roller overcoming resistance force) F and the total Fx obtained by calculation showed the same tendency and were quantitatively close. Accordingly, the resistance force (conveyor roller overcoming resistance force) F generated on the conveyor belt W when it passes over one conveyor roller 10A is directly proportional to the radial load of the conveyor roller 10A acting on the conveyor belt W, and is correlated. The conclusion that there is.

  As described above, according to the present invention, the above-described method facilitates the measurement of the conveyor roller overcoming resistance force F of the conveyor belt W and the generation mechanism of the conveyor roller overcoming resistance force F without using an actual belt conveyor device. It can be clarified.

The measurement of the resistance force F over the conveyor roller described above revealed that a peak shift phenomenon occurred when the conveyor belt W crossed the conveyor roller 10A. The asymmetric distribution of the load Fa in the radial direction of the conveyor roller 10A shown in FIG. 6 generates a component force Frx that acts in the direction opposite to the belt traveling direction (the slack side in the belt longitudinal direction). This component force Frx can be expressed by the following equation (2).
Frx = ΣK · α (φ) cosφdl (2)

  Here, the load point angle φ is an angle formed by an arbitrary point in the region where the distributed force acts as shown in FIG. 9 and the horizontal direction. In the equation (2), the integration range is a range where φ is θ1 to θ2. K is a calibration coefficient for changing from bending strain α to radially distributed force, and dl is the length between plots of bending strain α output in the measurement.

  In FIG. 9, the contact angle θ1 is the angle between the point where the conveyor belt W contacts the conveyor roller 10A and the horizontal direction, and the peel angle θ2 is the angle between the point where the conveyor belt W is peeled from the conveyor roller 10A and the horizontal direction. The H value indicates the forced displacement amount of the conveyor roller 10A, and the Ur value indicates the radial displacement of the conveyor belt W.

  FIG. 10 shows a comparison result between the roller overcoming resistance force F and the component force Frx when the normal force Fv acting on the conveyor belt W measured by the measuring device 1 is changed. From the results of FIG. 10, it can be seen that the roller overcoming resistance force F and the component force Frx increase as the vertical drag force Fv increases, and that both values are almost the same. Therefore, it can be said that the force mainly constituting the roller crossing resistance force F is a component force Frx generated by the peak shift phenomenon.

Next, the hysteresis phenomenon occurring on the surface of the conveyor belt W, which is the cause of the power loss of the conveyor belt W, was verified. FIG. 11 shows a radial load-radial displacement curve generated when the conveyor belt W passes the conveyor roller 10A. This curve is the result at one point on the surface of the conveyor belt W, and the radial displacement Ur means the displacement Ur shown in FIG. 9 and is calculated by the following equation (3). This curve was calculated by deleting the elapsed time t as a parameter from the measurement results of the radial load-elapsed time t and the radial displacement-elapsed time t by the measuring device 1. In the equation (3), the r value is the radius of the conveyor roller 10A.
Ur = r (sinφ−sinθ) / sin (π−φ) (3)

  From FIG. 11, the path is different between the loading stage and the unloading stage, and a hysteresis phenomenon occurs. From this result, the contact phenomenon between the conveyor belt W and the conveyor roller 10A can be explained as a hysteresis phenomenon by observing a change over time at an arbitrary point where the radial load Fa acts, and the entire region where the radial load Fa acts can be explained. When observed, this can be explained as a peak shift phenomenon.

  Note that it is considered that the stress-strain curve in the radial direction forms a loop in the conveyor belt W and a hysteresis loss occurs, and the surface of the conveyor belt W is also shown in FIG. 11 due to the hysteresis phenomenon inside the conveyor belt W. It can be considered that the hysteresis phenomenon shown has occurred.

  Next, the load point angles φ = 75, 80, 85, 90, 95 ° under the constant normal force Fv (= 7500 N / m) measured by the measuring device 1 in FIGS. The load history curve of the load Fa is shown.

  The arrival point of each load history curve indicates the state at the current time (radial load Fa). The current time indicates the time when the distribution of the load Fa in the radial direction has the distribution shape shown in FIG. The t value in each figure indicates the elapsed time t from the load start time to the present at each load point angle φ.

  From these results shown in FIGS. 12 to 17, the elapsed time t from the start of the load is different at each point (load point angle φ) in the contact area of the conveyor belt W and the conveyor roller 10 </ b> A. , The arrival point of the load history curve at each load point angle φ is different, and the distribution shape (distribution force) of the radial load Fa is determined by superimposing the arrival points of the load history curve at each point. It is thought. FIG. 18 is a diagram in which the load history curves in FIGS. 12 to 17 and the measurement results of the radial distribution force are superimposed.

  From the above results, a hysteresis phenomenon occurs on the inner surface of the conveyor belt W due to the stress relaxation phenomenon that is a viscoelastic property, and with the time difference of the load start time of the hysteresis loop (load history curve) on the belt surface, The arrival point of the hysteresis loop at each point becomes different. As a result, a peak shift phenomenon occurs in the distribution of the radial load Fa determined by the overlapping of the arrival points, and it is considered that the component force Frx that causes the roller crossing resistance force F is generated, resulting in the power loss of the conveyor belt W. .

  Therefore, it is possible to properly evaluate the power loss caused when the conveyor belt W is operated by paying attention to the stress relaxation phenomenon of the conveyor belt W in the time domain (the belt-roller contact time domain) causing the peak shift phenomenon. I can do it.

[Power loss evaluation method]
As shown in FIG. 19, the basic curve calculated by converting the relaxation spectrum obtained from the dynamic viscoelasticity test result of the conveyor belt W for measurement, and the contact time between the belt and the roller with respect to this basic curve. An analysis was performed using a predetermined model using a stress relaxation curve in which the slope tanθ in the region was changed. The vertical axis in FIG. 19 is the shear relaxation modulus G (t), and shows the response of stress to unit strain. The analysis result is shown in FIG.

  The contact time region between the belt and the roller can be set based on the waveform of the measured strain data by the strain gauge 21 of the measuring device 1, and for example, the region where the waveform has changed can be regarded as the contact time region between the belt and the roller. it can.

  From FIG. 20, it can be confirmed that the shift amount φS of the peak point of the conveyor roller overcoming resistance force F and the radial load Fa is decreased due to the decrease in the slope tan θ of the stress relaxation curve. Therefore, in order to reduce the resistance F over the conveyor roller and reduce the power loss during the operation of the conveyor belt W, the slope tanθ of the stress relaxation curve in the time region where the conveyor belt W and the conveyor roller are in contact with each other is reduced. It should be close to zero.

  As described above, by evaluating the inclination tan θ of the stress relaxation curve of the conveyor belt W in the time region where the conveyor belt W and the conveyor roller 10A are in contact with each other, it is possible to appropriately evaluate the power loss of the conveyor belt W. . This makes it possible to efficiently take measures to reduce power loss.

It is a schematic block diagram of the conveyor-roller overcoming resistance measuring apparatus of the conveyor belt for enforcing the conveyor-roller overcoming resistance measuring method of this invention. It is an enlarged plan view of the conveyor roller of this invention. It is an enlarged plan view in which a portion where a strain gauge of the conveyor roller is embedded is partially cut away. It is an enlarged view of the A section of FIG. It is an enlarged view of the B section of FIG. It is explanatory drawing which shows the relationship between the radial load of a conveyor roller, and the rotation angle of a conveyor roller. (A) is explanatory drawing of the graph of FIG. 6, (b) is graph explanatory drawing which shows the relationship between the conveyor roller climbing resistance force of a conveyor belt, and a vertical load. It is a side view which shows an example of the conventional testing machine for power consumption measurement of a conveyor belt. It is a schematic diagram which shows the state at the time of a contact with a conveyor belt and a conveyor roller. It is a graph which shows the relationship between a vertical drag, a conveyor roller overcoming resistance force, and the load of radial direction. It is a graph which shows the relationship between the radial load which acts on a conveyor belt, and the displacement of the radial direction in that case. It is a graph which shows the load history curve of the radial direction load which acts on the conveyor belt in the load point angle of 75 degrees. It is a graph which shows the load history curve of the radial load which acts on the conveyor belt in the load point angle of 80 degrees. It is a graph which shows the load history curve of the radial direction load which acts on the conveyor belt in the load point angle of 85 degrees. It is a graph which shows the load history curve of the load of the radial direction which acts on the conveyor belt in the load point angle of 90 degrees. It is a graph which shows the load history curve of the radial load which acts on the conveyor belt in the load point angle of 95 degrees. It is a graph which shows the load history curve of the load of the radial direction which acts on the conveyor belt in the load point angle of 98 degrees (peeling angle). FIG. 18 is a graph in which the load history curves of FIGS. 12 to 17 and the experimental results of radial distribution force are superimposed. It is a graph which shows the stress relaxation curve used for the analysis. It is a graph which shows the analysis result of the relationship between the inclination of a stress relaxation curve and the peak shift amount of a conveyor roller overcoming resistance force and radial direction distribution force.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Overcoming resistance measuring device 2 Frame 3a, 3b Clamp means 4 Clamping plate 5 Fastening bolt 6a, 6b Slide rail 7a, 7b Load cell 8a, 8b Adjustment screw 9 Plate 10 Traveling device 10A Conveyor roller 10a Rolling surface 11 Frame 12a, 12b Slide rail 13 Slide plate 14 Screw shaft 15a, 15b Bearing member 16 Gear mechanism 17 Drive motor 18 Support shaft 19 Bearing member 20 Load cell 21 Strain gauge 22 Recess 23 Code W Conveyor belt X Test device P Pressure Ta Tension side tension Tb Loose side Tension Fa Radial load F Overcoming resistance force

Claims (7)

  In order to predict and reduce the power consumption during the operation of the conveyor belt, this is a method for measuring the resistance of a conveyor belt overcoming a conveyor roller, and a plate for preventing deflection is arranged on the upper surface side. The conveyor roller with a strain gauge embedded in the rolling surface is pressed with a predetermined pressure from the lower surface side of the conveyor belt with load cells arranged at both ends, and the conveyor roller is rolled along the longitudinal direction of the conveyor belt. The load cell detects the tension on the conveyor belt side and the tension on the slack side during the running of the conveyor roller, and also detects the radial strain generated on the surface of the conveyor roller by the strain gauge embedded in the conveyor roller. Measured along with roller rolling, tension and looseness of the conveyor belt Conveyor roller overcome resistance measuring method of the conveyor belt, characterized by measuring the distribution force resulting from the distortion measurements by difference between the strain gauge and the tension in the conveyor belt.   The method for measuring a conveyor roller overcoming resistance of a conveyor belt according to claim 1, wherein a difference between the tension on the tension side and the loose side tension of the load cells arranged at both ends of the conveyor belt is used as the resistance over the conveyor roller.   Conveyor roller overcoming resistance force measuring device for measuring the overcoming resistance force generated in the conveyor roller in order to predict and reduce the power consumption during the operation of the conveyor belt. Conveyor rollers capable of rolling along the conveyor belt and moving up and down on both lower sides of the conveyor belt are provided with anti-deflection plates on both sides of the conveyor belt on which load cells for measuring the side tension are arranged. The strain gauge is embedded in a part of the rolling surface of this conveyor roller, and the radial strain generated on the surface of the conveyor roller by this strain gauge is measured together with the rolling of the conveyor roller. The conveyor belt resistance resistance measurement device of the conveyor belt.   4. The conveyor belt overcoming resistance measurement device of a conveyor belt according to claim 3, wherein a load cell is provided on the support shaft of the conveyor roller to measure a vertical drag when the conveyor roller is pressed to the lower surface side of the conveyor belt.   The conveyor roller overcoming resistance measurement device of the conveyor belt according to claim 3 or 4, wherein the conveyor roller is rolled along the conveyor belt via a traveling device.   6. The conveyor roller overcoming resistance measurement device for a conveyor belt according to claim 3, wherein the strain gauge embedded in the conveyor roller has a part of a rolling surface of the conveyor roller formed in a cantilever shape.   Using the conveyor belt overcoming resistance measurement device for a conveyor belt according to any one of claims 3 to 6, the conveyor belt is pressed from the lower surface side of the conveyor belt with a predetermined pressure in the longitudinal direction of the conveyor belt. The contact time from the time when the conveyor roller starts to contact the conveyor belt to the time when the contact point moves away from the conveyor belt is calculated from the strain measurement value by a strain gauge embedded in the conveyor roller, Calculate the stress relaxation curve based on the data acquired by the dynamic viscoelasticity test of the conveyor belt, and evaluate the power loss of the conveyor belt based on the slope of the stress relaxation curve in the contact time region. Evaluation method.

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