JP2019056627A - Wear detection device and wear diagnosis system of belt conveyor - Google Patents

Abstract

To provide a wear detection device and a wear diagnosis system of a belt conveyor that have high detection precision and are highly reliable regardless of simple structure.SOLUTION: A wear detection device of a belt conveyor includes: a detection part including a plurality of detection arms in which the tips are rockable in a vertical direction relative to a traveling direction of a belt; a set roller; a sensor part capable of generating a detection signal by detecting displacement of rear end parts of the detection arms; and a frame part. The belt can be clamped in a thickness direction by the tips of the detection arms and the set roller. The wear diagnosis system of the belt conveyor includes the wear detection device and a wear diagnosis device. The wear diagnosis device includes a control unit for generating an alarm signal by receiving a detection signal, and an alarm unit for starting an alarm mode by receiving the alarm signal.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a belt conveyor wear detection apparatus and wear diagnosis system, and more particularly, to a belt conveyor wear detection apparatus and wear diagnosis system having a simple structure and high detection accuracy and high reliability.

A belt conveyor is a device that rotates a wide belt connected endlessly with a roller and loads and transports a work (work) on the surface, and is widely used in various fields such as manufacturing, construction, and mining. ing.
The belt of the belt conveyor is mainly made of rubber or resin, and the surface of the belt becomes worn and thin by repeated use. If this is used continuously without being repaired, the belt may be damaged or broken.
Currently, many companies ask repairers to repair after the belt has actually been damaged and can no longer be operated. For this reason, it takes time until the restoration, and all the operation lines are stopped during the repair work, resulting in a large loss in business.
In addition, if the belt breaks during use of the belt conveyor, there is a risk that equipment and workpieces may be seriously damaged.

In order to avoid the above problems, techniques such as Patent Documents 1 to 3 have been developed that detect the degree of belt wear and enable repair before the belt is damaged.
In Patent Documents 1 and 2, an X-ray transmission image of a belt is created by using an X-ray generator and an X-ray line sensor arranged opposite to each other with the belt interposed therebetween. A technique for determining the presence or absence is disclosed.
Patent Document 3 discloses a technique in which sensors are arranged at a plurality of positions on the back side of a belt, and a magnetic material or the like embedded in the belt is sensed by the sensor to detect wear.

Japanese Patent Laying-Open No. 2015-81857 JP 2012-185148 A JP 2009-12957 A

The prior art has the following drawbacks.
<1> Since a special apparatus such as an X-ray line sensor or an image analysis apparatus is used, the introduction cost and the work cost are high.
<2> Since an amplifier for amplifying a slight change in the thickness of the belt is required, the introduction cost is high.
<3> Since a precision instrument is used, the measured value is likely to be distorted or broken due to the vibration of the belt conveyor.

The belt conveyor wear detection device of the present invention that solves the above problems includes a detection unit having a plurality of detection arms whose tip is swingable in the vertical direction with respect to the belt traveling direction, a set roller, and a detection arm. A sensor unit capable of detecting a displacement of the rear end part to generate a detection signal and a frame part are provided, and the belt can be clamped in the thickness direction between the front end of the detection arm and the set roller.
According to this configuration, it is possible to reliably detect belt wear with a simple structure.

Wear detection device for a belt conveyor of the present invention, the first distance L ¹ of the detection arm may be smaller than the second distance L ^2.
According to this configuration, the wear amount of the belt can be mechanically amplified and detected.

Wear detection device for a belt conveyor of the present invention, the second distance L ² may be first distance twice or more L ^1.
According to this configuration, a slight wear amount of the belt can be greatly amplified and detected.

In the belt conveyor wear detection device of the present invention, the detection unit may include an arm guide and an elastic member.
According to this configuration, the contact roller can always be brought into contact with the surface of the belt by the tensile tension of the elastic member.

In the belt conveyor wear detection device of the present invention, the sensor unit may include an ON / OFF type wear detection switch.
According to this configuration, it is possible to reliably detect belt wear with a simple structure.

In the belt conveyor wear detection device of the present invention, the sensor unit may include an ON / OFF type separation detection switch.
According to this configuration, it is possible to reliably detect belt separation (separation) with a simple structure.

In the belt conveyor wear detection device of the present invention, the sensor unit may include a displacement sensor.
According to this configuration, the wear state of the belt can be detected in real time.

The belt conveyor wear detection apparatus of the present invention may include guide rollers positioned before and after the set roller.
According to this configuration, it is possible to prevent the belt from slacking or shifting.

The belt conveyor wear diagnosis system of the present invention includes a wear detection device and a wear diagnosis device. The wear diagnosis device receives a detection signal and generates a warning signal, and receives the warning signal and activates a warning mode. It is characterized by having a warning unit.
According to this structure, a warning can be transmitted to an operator or an administrator based on the wear state of the belt.

In the belt conveyor wear diagnosis system of the present invention, the warning unit may stop the driving of the belt conveyor, turn on the warning light, or issue an alarm depending on the warning mode.
According to this configuration, it is possible to prevent occurrence of damage due to wear of the belt.

In the belt conveyor wear diagnosis system according to the present invention, the wear diagnosis apparatus may include a display unit.
According to this configuration, the wear state of the belt can be visually displayed.

In the belt conveyor wear diagnosis system of the present invention, the control unit may include a position detection means.
According to this configuration, the wear position in the longitudinal direction of the belt can be detected.

The belt conveyor wear detection device and wear diagnosis system according to the present invention has a simple structure comprising a combination of a mechanical detection unit and a limit switch, and a slight change in the thickness of the belt is detected mechanically using the dimensional ratio of the detection arm. Can be amplified and detected.
For this reason, the wear of the belt can be reliably detected with a simple structure, and is extremely inexpensive and highly reliable as compared with the prior art, and is less likely to fail.

Explanatory drawing of the abrasion detection apparatus of the belt conveyor of this invention. Explanatory drawing of a detection part. Explanatory drawing of a detection arm. Explanatory drawing of a sensor part. Explanatory drawing of the abrasion diagnostic system of the belt conveyor of this invention. Explanatory drawing of Example 3. FIG.

The belt conveyor wear detection device and wear diagnosis system of the present invention will be described below in detail with reference to the drawings.
In this specification and the like, the “work side” of the belt conveyor means the side that conveys the work from the beginning to the rear end of the belt conveyor, usually the upper side, and the “return side” has finished conveying the work. The side where the belt returns from the rear end to the start end, usually the lower side.
Further, the “surface” of the belt means an outer surface of the belt connected in an annular shape, that is, a work mounting surface, and the “rear surface” of the belt means an opposite surface, that is, a pulley side surface.

[Wear detection device]
<1> Overall configuration (FIG. 1).
The belt conveyor wear detection device 1 of the present invention is a device that is installed on a return-side frame of the belt conveyor B to detect belt wear and generates a detection signal SS based on the detection result.
The wear detection device 1 is connected to a detection unit 10 arranged on the front surface side of the belt, a set roller 20 arranged on the back side of the belt, a sensor unit 30 arranged near the rear end of the detection unit 10 and these. And a frame-shaped frame portion 40.
In this example, two guide rollers 50 are further provided before and after the set roller 20 in the frame portion 40. The guide roller 50 is disposed on the surface side of the belt.
The belt of the belt conveyor B is sandwiched in the thickness direction by the tip of the detection unit 10 and the set roller 20.
In this example, the wear detection device 1 is attached to the frame of the belt conveyor B, and the degree of belt wear is constantly monitored. In addition, it may be configured to be easily detachable from the belt conveyor B, and may be monitored periodically.

<2> Detection unit (FIG. 2).
The detection unit 10 is a component that detects the displacement of the belt, amplifies it, and transmits it to the sensor unit 30.
The detection unit 10 includes a plurality of elongated detection arms 11, an arm guide 12 positioned below the detection arms 11, and a support shaft 13 that pivotally supports the plurality of detection arms 11 on the arm guide 12.
The plurality of detection arms 11 can be swung up and down with respect to the running direction of the belt around the support shaft 13.
However, the structure of the detection unit 10 is not limited to the above. For example, the arm guide 12 may not be provided, and the plurality of detection arms 11 may be directly supported on the frame unit 40.

<2.1> Detection arm (FIG. 3).
The detection arm 11 is a member that contacts the surface of the belt and measures the thickness of the belt.
The detection arm 11 has an elongated shape that is refracted in the shape of a “f” in the middle. A drilled shaft hole 11c and a contact roller 11d attached to the tip of the front arm 11a are provided.
The contact roller 11d is pivotally supported at the tip of the front arm 11a and can rotate with respect to the surface of the belt.
In this example, the shaft hole 11c is provided in the front arm 11a. However, the present invention is not limited to this, and may be provided on the refracted portion of the detection arm 11 or on the rear arm 11b side as long as a dimensional ratio described later is satisfied.

<2.1.1> Dimensional ratio of detection arm (FIG. 3).
The belt conveyor wear detection device 1 of the present invention is characterized in that the belt wear can be mechanically amplified and transmitted by the dimensional ratio of the detection arm 11.
First distance L ¹ is the maximum distance from the tip of the detecting arm 11 to the center of the support shaft is set smaller than the second distance L ² is the maximum distance from the rear end of the detecting arm 11 to the center of the support shaft. That is, the second distance ^{L 2} is first distance ^{L 1} or more.
More desirably the second distance L ² is more than twice the first distance L ^1.
With this configuration, the displacement of the tip of the front arm 11a is amplified to (L ² / L ¹ ) times according to the dimensional ratio between the first distance L ¹ and the second distance L ² and transmitted to the rear arm 11b, and the belt thickness It is possible to accurately detect slight wear.

<2.2> Elastic member.
In this example, the detection unit 10 further includes a plurality of elastic members 14 that connect the rear end side of the detection arm 11 and the lower end of the arm guide 12.
In this example, a tension spring is employed as the elastic member 14.
By applying a tensile tension between the lower end of the rear arm 11b of the detection arm 11 and the lower end of the arm guide 12 by the elastic member 14, the rear arm 11b is pulled toward the arm guide 12 side.
As a result, the front arm 11a of the detection arm 11 is lifted upward about the support shaft 13, so that the contact roller 11d can be kept in contact with the surface of the belt at all times.
Note that the method of maintaining the contact of the contact roller 11d is not limited to the method using the tension tension of the elastic member 14. For example, the front arm 11a is moved by the torsion spring attached to the support shaft 13 or the weight of the rear arm 11b. You may employ | adopt the method of lifting.

<3> Set roller.
The set roller 20 is a component that supports the back surface of the belt.
The set roller 20 is pivotally supported by the frame portion 40 in the belt width direction, and is configured to be rotatable in the belt traveling direction.
When in use, the set roller 20 contacts the back surface of the belt and clamps the belt together with the contact roller 11 d of the detection arm 11.
The material of the set roller 20 can be appropriately selected from known materials such as resin, aluminum alloy, and stainless steel according to the material and thickness of the belt.

<4> Sensor part (FIG. 4).
The sensor unit 30 is a component that detects the displacement of the detection unit 10 and generates a detection signal SS.
The sensor unit 30 is installed near the rear end of the detection arm 11 in the frame unit 40. In this example, a part of the frame part 40 protrudes downward, and the sensor part 30 is installed in the protruding part.
The sensor unit 30 of this example employs a combination of a detection switch 31 and a detection plate 32 that is positioned above the detection switch 31 and is pivotally supported in the width direction of the belt in the frame unit 40.
The detection plate 32 has a width equal to or larger than the entire width of the plurality of detection arms 11 arranged in parallel, and the lower side is pivotally supported by the frame portion 40, and the upper side is located below the rear end of the detection arm 11.
A torsion spring or the like is disposed on the support shaft of the detection plate 32, and the upper side of the detection plate 32 is urged toward the upper detection arm 11 side.
The above configuration of the sensor unit 30 is merely an example, and other contact displacement sensors, non-contact displacement sensors such as optical, overcurrent, and ultrasonic sensors may be employed.
In short, any configuration that can detect the displacement of the rear end portion of the detection arm 11 and generate the detection signal SS may be used.

<4.1> Detection switch.
The detection switch 31 is a switch that generates a detection signal SS.
In this example, a limit switch is employed as the detection switch 31.
The detection switch 31 is provided on the frame portion 40 with the actuator facing upward, that is, toward the bottom surface of the detection plate 32.
The detection switch 31 generates a detection signal SS that is an ON / OFF signal when the upper actuator is pressed downward.

<4.2> A wear detection function of the sensor unit (FIG. 4).
When the belt of the belt conveyor B is worn due to friction, the thickness of the belt is reduced at the worn portion.
When the thickness of the belt decreases, the contact roller 11d at the tip of the detection arm 11 corresponding to the worn portion among the plurality of detection arms 11 is displaced toward the set roller 20 and the rear end of the detection arm 11 is centered on the support shaft 13. Goes down.
At this time, the displacement amount at the front end side of the detection arm 11 is amplified (L ² / L ¹ ) times according to the dimensional ratio between the first distance L ¹ and the second distance L ² and transmitted to the rear end of the detection arm 11. Therefore, even a slight amount of displacement can be accurately measured.
When the rear end of the detection arm 11 is displaced downward, the upper side of the detection plate 32 is pushed downward.
If any one place in the width direction of the belt wears exceeding a preset limit amount, the detection arm 11 corresponding to the worn place pushes down the detection plate 32 to a position where the actuator of the detection switch 31 is pressed. Thereby, the electric circuit inside the detection switch 31 is connected, and the detection signal SS is generated.
In addition, the sensor unit 30 may have a peeling detection function or a displacement amount detection function. Each of these configurations will be described later in Examples 2 and 3.

<5> Guide roller.
The guide roller 50 is a component that guides the belt before and after the set roller 20 to prevent the belt from slackening or shifting.
In this example, two guide rollers 50 are arranged before and after the set roller 20.
The guide roller 50 is pivotally supported by the frame portion 40 in the width direction of the belt, and can contact the surface of the belt and rotate in the belt traveling direction.
The guide roller 50 is not an essential component.

[Wear diagnosis system]
<1> Overall configuration (FIG. 5).
The wear diagnosis system A is a device that diagnoses the belt wear state of the belt conveyor B and activates a warning mode or displays on a display.
The wear diagnosis system A includes at least a wear detection device 1 and a wear diagnosis device 2.
The wear diagnosis system A is configured, for example, by attaching the wear detection device 1 to the belt conveyor B and electrically connecting the wear detection device 1 to the wear diagnosis device 2 in a wired or wireless manner.
In this example, electricity is supplied from an external power source to the wear diagnostic device 2, and electricity is supplied to the wear detection device 1 through an electrical connection with the wear diagnostic device 2.
However, the present invention is not limited to this, and the power source of the wear detection device 1 and the power source of the wear diagnosis device 2 may be individually provided.

<2> Wear diagnosis device.
The wear diagnostic device 2 is a device that performs various processes based on the detection signal SS transmitted from the wear detection device 1.
The wear diagnostic device 2 includes at least a control unit 2a that is electrically connected to the sensor unit 30 of the wear detection device 1, and a warning unit 2b that is electrically connected to the control unit 2a.
In this example, the wear diagnostic apparatus 2 further includes a display unit 2c that is electrically connected to the control unit 2a.

<2.1> Control unit.
The control unit 2 a is a unit that controls the wear diagnostic apparatus 2.
The control unit 2a receives the detection signal SS generated by the sensor unit 30, thereby generating the warning signal SW and the display signal SD, the warning signal SW to the warning unit 2b, and the display signal SD to the display unit 2c, respectively. Send.
In this example, the control unit 2a includes a position detection unit 2d.
The position detection means 2d can specify the wear position in the belt length direction by calculating the time when the detection signal SS is generated and the belt speed.

<2.2> Warning unit.
The warning unit 2b is a unit that activates the warning mode.
The warning unit 2b activates the warning mode by receiving the warning signal SW received from the control unit 2a.
In the warning mode, for example, the following function is activated in order to prevent damage due to wear of the belt of the belt conveyor B.
(1) The energization to the belt conveyor B is interrupted by a shut-off device electrically connected to the power source of the belt conveyor B, and the travel of the belt conveyor B is urgently stopped.
(2) The warning lamp of the signal tower that is electrically connected to the wear diagnostic device 2 is turned on to alert the operator and the manager.
(3) An alarm buzzer is issued from a speaker electrically connected to the wear diagnostic device 2 to alert the operator or manager.
(4) The warning information is transmitted to the manager who is away from the installation place of the belt conveyor B by wired or wireless means to call attention.

<2.3> Display unit.
The display unit 2c is a unit that visually displays the wear state of the belt.
In this example, a liquid crystal display is employed as the display unit 2c.
By receiving the display signal SD generated by the control unit 2a, the display unit 2c displays information such as whether or not the belt has worn beyond the limit amount and the time when the limit amount has been exceeded.

[Example with peeling detection function]
In this example, the sensor unit 30 includes a peeling detection function for detecting belt peeling (separation).
The detection switch 31 and the detection plate 32 having the same structure as that of the first embodiment are installed above the rear end portions of the plurality of detection arms 11 in a vertically inverted direction.
When the belt surface of the belt conveyor B peels due to deterioration, the belt piece at the peeled portion becomes thick due to the peeled and stripped belt pieces.
When the contact roller 11d of the detection arm 11 comes into contact with the peeled belt piece, the front arm 11a of the detection arm 11 swings down and the rear arm 11b swings up. As a result, the detection plate 32 is flipped upward to press the actuator of the detection switch 31, and the detection switch 31 generates the detection signal SS of the ON / OFF signal.
In this example, with the above configuration, it is possible to effectively detect belt peeling with a simple structure.

[Example with displacement detection function]
In this example, the sensor unit 30 includes a displacement amount detection function for detecting the displacement amount of the belt.
In the first embodiment, the plurality of detection arms 11 are associated with one detection plate 32, but in this example, the plurality of displacement amount sensors 33 are individually arranged on each detection arm 11.
The displacement amount sensor 33 detects the displacement amount of the detection arm 11 and generates a detection signal SS as a physical amount signal including displacement amount information instead of the ON / OFF signal, and transmits the detection signal SS to the control unit 2a.
The control unit 2a generates a display signal SD based on the detection signal SS of each displacement amount sensor 33, and transmits the display signal SD to the display unit 2c.
The display unit 2c that has received the display signal SD displays a belt thickness management screen that displays the thickness of each part in the width direction of the belt in real time.
FIG. 6 shows an example of the belt thickness management screen.
S1 to S8 on the screen correspond to the displacement sensor 33 arranged at each position in the belt width direction, and the scale of each displacement sensor 33 and the numerical value below the scale represent the thickness of the belt at each position in the width direction. .
In the example of FIG. 6, the warning is displayed because the thickness of the S3 portion of the belt is less than the predetermined limit thickness Lv1.
In this example, the belt wear condition can be visually recognized in real time, so that the belt can be systematically maintained without impairing the operation schedule.

DESCRIPTION OF SYMBOLS 1 Wear detection apparatus 10 Detection part 10a Detection unit 11 Detection arm 11a Front arm 11b Rear arm 11c Shaft hole 11d Contact roller 12 Arm guide 13 Support shaft 14 Elastic member 20 Set roller 30 Sensor part 31 Detection switch 32 Detection plate 33 Displacement amount sensor 40 Frame 50 Guide roller 2 Wear diagnostic device 2a Control unit 2b Warning unit 2c Display unit 2d Position detection means A Wear diagnosis system B Belt conveyor SS Detection signal SW Warning signal SD Display signal

Claims (12)

A belt conveyor wear detection device that is installed on the return side of a belt conveyor to detect belt wear,
A detection unit, a set roller, a sensor unit, and a frame unit;
The detection unit is an elongated detection arm attached to the frame unit, and is pivotally supported in the width direction of the belt. Has a plurality of detection arms that can swing vertically with respect to
The set roller is attached to the frame portion, is pivotally supported in the width direction of the belt, is in contact with the second surface of the belt, and is rotatable in the running direction of the belt,
The sensor unit is attached near the rear end of the detection arm in the frame unit, and can detect a displacement of the rear end of the detection arm and generate a detection signal based on the displacement.
The belt can be sandwiched in the thickness direction by the tip of the detection arm and the set roller.
Wear detection device for belt conveyors. In the detection arm, the first distance L ¹ that is the maximum distance from the tip of the detection arm to the center of the support shaft is the second distance L ² that is the maximum distance from the rear end of the detection arm to the center of the support shaft. The belt conveyor wear detection device according to claim 1, wherein the belt conveyor wear detection device is smaller. Characterized in that said the second distance L ² is at least twice the first distance L ^1, the wear detecting device for a belt conveyor according to claim 2.   The detection unit includes an arm guide and an elastic member. The detection arm is pivotally supported by the arm guide in the width direction of the belt, and the elastic member includes a rear end side of the detection arm and the The belt conveyor wear detection device according to any one of claims 1 to 3, wherein an arm guide is connected and a tensile tension can be applied therebetween.   The sensor unit includes a wear detection switch that is positioned below a rear end portion of the detection arm and generates a detection signal when a downward displacement amount of the detection arm exceeds a certain amount. The belt conveyor wear detection device according to any one of claims 1 to 4.   The sensor unit is provided above a rear end portion of the detection arm, and includes a peeling detection switch that generates a detection signal when the amount of displacement upward of the detection arm exceeds a certain amount. 6. The belt conveyor wear detection device according to claim 5.   The said sensor part is provided with the displacement amount sensor which detects the displacement amount of the rear end of the said detection arm, and produces | generates a detection signal based on this displacement amount, The one of Claims 1 thru | or 4 characterized by the above-mentioned. The belt conveyor wear detection device according to claim 1.   At least two guide rollers positioned before and after the set roller, the guide rollers being attached to the frame portion, pivotally supported in the width direction of the belt, and contacting the first surface of the belt The belt conveyor wear detection device according to any one of claims 1 to 7, wherein the belt conveyor wear detection device is rotatable in a belt traveling direction. A wear detection device according to any one of claims 1 to 8, and a wear diagnosis device,
The wear diagnostic apparatus has a control unit electrically connected to the sensor unit, and a warning unit electrically connected to the control unit,
The control unit receives the detection signal from the sensor unit, generates a warning signal based on the detection signal, transmits the warning signal to the warning unit,
The warning unit activates a warning mode based on the warning signal,
Belt conveyor wear diagnostic system.   10. The belt conveyor wear diagnosis system according to claim 9, wherein the warning unit stops driving the belt conveyor, lights a warning light, or issues an alarm according to the warning mode. .   The wear diagnostic apparatus includes a display unit electrically connected to the control unit, and the control unit generates a display signal based on the detection signal, transmits the display signal to the display unit, and displays the display. 11. The wear diagnosis system according to claim 9, wherein the unit can visually display a wear state of the belt based on the display signal.   The said control unit is provided with the position detection means which can calculate the abrasion position in the length direction of the said belt based on the time when the said detection signal was produced | generated, and the running speed of the belt. The wear diagnosis system for a belt conveyor according to any one of claims 1 to 11.

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