Conveying belt tearing detection device

Abstract

The utility model provides a conveying belt tearing detection device. The conveying belt tearing detection device comprises a conveying belt, a carrier roller unit and an ultrasonic ranging module, wherein the conveying belt is used for placing and conveying articles; the carrier roller unit is used for supporting the conveying belt; the ultrasonic ranging module is located below the conveying belt and used for sending a first ultrasonic signal to the conveying belt, receiving a second ultrasonic signal reflected back from a to-be-detected object after the first ultrasonic signal collides with the to-be-detected object and processing the second ultrasonic signal to obtain a detection signal. The detection signal is used for representing the conveying belt state of the conveying belt, and the conveying belt state comprises a normal state or a torn state of the conveying belt. According to the conveying belt tearing detection device, the detection result of the conveying belt tearing detection device has better real-time performance and higher reliability.

Description

Technical Field

[0001] The present application relates to the field of coal mine technology, and in particular to a conveyor belt tear detection device. Background Art

[0002] Conveyor belt longitudinal tearing accidents are common in coal mines and other enterprises. The consequences are often very serious. It takes a lot of manpower and time to restore the belt conveyor to operation, causing great economic losses to the enterprise.

[0003] On the one hand, the current traditional detection of longitudinal tearing of conveyor belts is based on the principle of detecting the falling material, which is an indirect detection of the longitudinal tearing of the belt by the longitudinal tearing detection device: the falling material after the conveyor belt is longitudinally torn is detected, thereby indirectly determining whether the belt is torn. This is achieved by installing a pressure sensor or other inductive alarm device (anti-tear alarm device) under the conveyor belt. When the belt is torn, the material on the belt falls from the tear to the receiving tray of the anti-tear alarm device, so that the belt is sensed to be torn according to the change of the material in the receiving tray.

[0004] However, in the actual detection process, since the tape forms a groove on the roller, after the tape is torn, the tape on both sides of the crack tends to retract along the two sides of the groove. Therefore, after the tape is torn, it is often not wide open, but the tape on both sides of the crack overlaps to seal the crack, and the material on the tape is not easy to leak out, resulting in material leakage only after the tape is torn to a certain length, causing an alarm and resulting in poor detection effect. In addition, due to the spillage of materials, this device often misreports, causing unexpected shutdowns and affecting production. Therefore, although the tape longitudinal tear detection device based on the principle of detecting falling materials is currently the most used on site, the effect is not good.

[0005] On the other hand, in recent years, the conveyor belt longitudinal tear detection method based on machine vision has been gradually developed and applied. Its principle is to judge the longitudinal tear fault of the conveyor belt by recognizing the surface image of the conveyor belt. However, this type of detection device is expensive and has high requirements for the on-site environment such as dust and water spray. However, the actual on-site working environment of the conveyor is harsh, so its detection effect is not good.

[0006] In summary, in order to improve the detection rate of longitudinal tearing faults of conveyor belts, a new belt tearing detection device is urgently needed. Utility Model Content

[0007] The main purpose of the present application is to provide a conveyor belt tear detection device to solve the problem of poor conveyor belt tear detection effect in the prior art.

[0008] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a conveyor belt tear detection device is provided, including a conveyor belt, a roller unit and an ultrasonic ranging module, wherein: the conveyor belt is used to place and convey objects; the roller unit is used to support the conveyor belt; the ultrasonic ranging module is located below the conveyor belt, and is used to send a first ultrasonic signal to the conveyor belt, and after the first ultrasonic signal collides with the object to be detected, receive a second ultrasonic signal reflected from the object to be detected, and perform signal processing on the second ultrasonic signal to obtain a detection signal, and the detection signal is used to characterize the conveyor belt state of the conveyor belt, and the conveyor belt state includes that the conveyor belt is in a normal state or that the conveyor belt is in a torn state.

[0009] Optionally, the detection device further includes: a display module, which is communicatively connected to the ultrasonic ranging module and is used to receive and display the detection information in the detection signal.

[0010] Optionally, the detection device further includes: a monitoring background, which is communicatively connected to the ultrasonic ranging module, and is used to receive the detection signal, and monitor the operating status of the conveyor belt tear detection device according to the detection signal and the operating index of the conveyor belt tear detection device.

[0011] Optionally, the detection device further comprises: an alarm module, which is communicatively connected with the ultrasonic ranging module and is used for issuing an alarm signal when the detection signal indicates that the conveyor belt is in the torn state.

[0012] Optionally, the detection device further comprises: a switch output module, which is communicatively connected with the ultrasonic ranging module, and is used for outputting a longitudinal tear fault signal to the control console when the detection signal indicates that the conveyor belt is in the tear state.

[0013] Optionally, the detection device further comprises: a waveguide located at a critical position of the conveyor belt, for transmitting the first ultrasonic signal and the second ultrasonic signal, the critical position being a position where longitudinal tearing of the conveyor belt is prone to occur.

[0014] Optionally, there are multiple waveguide tubes, and the multiple waveguide tubes are spaced apart along the length direction of the conveyor belt.

[0015] Optionally, the ultrasonic ranging module includes: an ultrasonic signal generating device for emitting the first ultrasonic signal; an ultrasonic signal receiving device for receiving the second ultrasonic signal; and an ultrasonic signal analyzing device for performing signal processing on the second ultrasonic signal.

[0016] Optionally, the ultrasonic ranging module comprises a plurality of modules, and the plurality of ultrasonic ranging modules are distributed at intervals along the width direction of the conveyor belt.

[0017] Optionally, the above-mentioned roller unit includes a first roller unit, a second roller unit and a third roller unit; the above-mentioned first roller unit, the above-mentioned second roller unit and the above-mentioned third roller unit are connected in sequence to form an inverted trapezoidal groove structure; the above-mentioned conveyor belt is located on the side wall and the bottom of the above-mentioned groove structure.

[0018] According to the technical solution of the present application, a conveyor belt tear detection device includes a conveyor belt, a roller unit and an ultrasonic ranging module, wherein the conveyor belt is used to place and transport items, the roller unit is used to support the conveyor belt, and the ultrasonic ranging module is located below the conveyor belt, and is used to send a first ultrasonic signal to the conveyor belt, and after the first ultrasonic signal collides with the object to be detected, receive a second ultrasonic signal reflected from the object to be detected, and perform signal processing on the second ultrasonic signal to obtain a detection signal, and the detection signal is used to characterize the conveyor belt state of the conveyor belt, and the conveyor belt state includes the conveyor belt being in a normal state or the conveyor belt being torn. Since the ultrasonic ranging module in the present application can be applied to occasions with complex working conditions such as dust and water spray, therefore, in a complex underground environment, the first ultrasonic signal can be directly sent to the conveyor belt through the ultrasonic ranging module, and according to the received second sound wave signal, it is determined whether the conveyor belt state of the conveyor belt is in a normal state or in a torn state, so that the detection result of the conveyor belt tear detection device has better real-time performance and higher reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0020] Figure 1 A schematic diagram showing the positional relationship between a conveyor belt in a normal state and an ultrasonic ranging module in a conveyor belt tear detection device according to an embodiment of the present application is shown;

[0021] Figure 2 A schematic diagram showing the positional relationship between a conveyor belt in a torn state and an ultrasonic ranging module in a conveyor belt tear detection device according to an embodiment of the present application is shown;

[0022] Figure 3 A schematic diagram showing the positional relationship between a conveyor belt and a plurality of ultrasonic distance measuring modules in a conveyor belt tear detection device according to an embodiment of the present application is shown;

[0023] Figure 4A schematic diagram showing the positional relationship between a first roller unit, a second roller unit and a third roller unit in a conveyor belt tear detection device according to an embodiment of the present application is shown.

[0024] The above drawings include the following reference numerals:

[0025] 100, object to be measured; 200, ultrasonic distance measurement module; 10, first roller unit; 20, second roller unit; 30, third roller unit. DETAILED DESCRIPTION

[0026] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0027] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0028] It should be understood that when an element (such as a layer, film, region, or substrate) is described as being "on" another element, the element may be directly on the other element, or there may be intermediate elements. Moreover, in the specification and claims, when it is described that an element is "connected" to another element, the element may be "directly connected" to the other element, or "connected" to the other element through a third element.

[0029] As introduced in the background technology, the conventional detection of longitudinal tear of conveyor belt in the prior art is based on the principle of detecting the falling material, and the longitudinal tear detection device of the conveyor belt is used for indirect detection: the falling material after the conveyor belt is longitudinally torn is detected, so as to indirectly determine whether the belt is torn; or the prior art also provides a method for detecting longitudinal tear of conveyor belt, which is to judge the longitudinal tear fault of conveyor belt by image recognition of the surface of conveyor belt. Since the above indirect detection method forms a groove on the roller in the actual detection process, after the belt is torn, the belts on both sides of the crack have a tendency to retract along both sides of the groove, so after the belt is torn, it is often not open wide, but the belts on both sides of the crack overlap to seal the crack, and the material on the belt is not easy to leak, so that the material leaks only after the belt is torn to a certain length, causing an alarm, resulting in poor detection effect. In addition, since the detection device required by the above image recognition detection method is relatively expensive, and has high requirements for the on-site environment such as dust and water spray, but the on-site working environment of the actual use of the conveyor is harsh, its detection effect is not good. In order to solve the above technical problem of poor detection effect, the present application proposes a new conveyor belt tear detection device.

[0030] According to one aspect of the present application, a conveyor belt tear detection device is provided, which may include a conveyor belt, a roller unit and an ultrasonic ranging module, wherein: the conveyor belt is used to place and convey items; the roller unit is used to support the conveyor belt; the ultrasonic ranging module is located below the conveyor belt, and is used to send a first ultrasonic signal to the conveyor belt, and after the first ultrasonic signal collides with the object to be detected, receive a second ultrasonic signal reflected from the object to be detected, and perform signal processing on the second ultrasonic signal to obtain a detection signal, wherein the detection signal is used to characterize the conveyor belt state of the conveyor belt, and the conveyor belt state includes that the conveyor belt is in a normal state or that the conveyor belt is in a torn state.

[0031] Specifically, the ultrasonic ranging module is used to detect whether the conveyor belt is torn. If the ultrasonic ranging module detects that the conveyor belt is not torn, Figure 1 As shown, the distance L1 measured by the ultrasonic ranging module 200 (which can be considered as the distance between the ultrasonic ranging module 200 and the object to be measured 100) can fluctuate within a predetermined range. Figure 2As shown, the distance L2 measured by the ultrasonic ranging module 200 (which can be considered as the distance between the ultrasonic ranging module 200 and the object to be measured 100) may exceed the above-mentioned predetermined range, that is, the ultrasonic ranging module 200 will measure a distance measurement value that changes dramatically at the tearing position, and the distance measurement value is not within the above-mentioned predetermined range. The above-mentioned L2 is smaller than the above-mentioned L1.

[0032] It should be noted that the object to be detected 100 may be a conveyor belt, or an article or material placed on the conveyor belt.

[0033] In the above embodiment, a conveyor belt tear detection device includes a conveyor belt, a roller unit and an ultrasonic ranging module, wherein the conveyor belt is used to place and transport items, the roller unit is used to support the conveyor belt, and the ultrasonic ranging module is located below the conveyor belt, and is used to send a first ultrasonic signal to the conveyor belt, and after the first ultrasonic signal collides with the object to be detected, receive a second ultrasonic signal reflected from the object to be detected, and perform signal processing on the second ultrasonic signal to obtain a detection signal, and the detection signal is used to characterize the conveyor belt state of the conveyor belt, and the conveyor belt state includes the conveyor belt being in a normal state or the conveyor belt being torn. Since the ultrasonic ranging module in the present application can be applied to occasions with complex working conditions such as dust and water spray, therefore, in a complex underground environment, the first ultrasonic signal can be directly sent to the conveyor belt through the ultrasonic ranging module, and according to the received second sound wave signal, it is determined whether the conveyor belt state of the conveyor belt is in a normal state or in a torn state, so that the detection result of the conveyor belt tear detection device has better real-time performance and higher reliability.

[0034] In some optional embodiments, in order to obtain the detection results intuitively, the conveyor belt tear detection device further includes a display module, which can be communicatively connected to the ultrasonic ranging module to receive and display the detection information in the detection signal.

[0035] Specifically, the detection signal can be used to transmit detection information, and the detection information can include but is not limited to the time from the ultrasonic ranging module sending out the first ultrasonic signal to receiving the second ultrasonic signal, the distance between the ultrasonic ranging module and the object to be measured, the signal frequency of the first ultrasonic signal and the second ultrasonic signal, and the signal strength of the first ultrasonic signal and the second ultrasonic signal. Thus, the display module is used to display the time (the time from the ultrasonic ranging module sending out the first ultrasonic signal to receiving the second ultrasonic signal), the distance (the distance between the ultrasonic ranging module and the object to be measured), the signal frequency (the signal frequency of the first ultrasonic signal and the second ultrasonic signal), and the signal strength (the signal strength of the first ultrasonic signal and the second ultrasonic signal). Exemplarily, the display module can be a liquid crystal display module.

[0036] In order to monitor and manage the operation and performance of the entire conveyor belt tear detection device, in some optional embodiments, the conveyor belt tear detection device also includes a monitoring background, which communicates with the ultrasonic ranging module to receive the detection signal and monitor the operation status of the conveyor belt tear detection device based on the detection signal and the operation index of the conveyor belt tear detection device.

[0037] Exemplarily, the operating index of the conveyor belt tear detection device can be a preset time interval from the ultrasonic ranging module sending out the first ultrasonic signal to receiving the second ultrasonic signal, and the preset time interval can be detected by changing the distance between the ultrasonic ranging module and the object to be measured. In addition, when the conveyor belt is in a normal state, the distance between the ultrasonic ranging module and the object to be measured in the first direction is less than or equal to the maximum distance between the ultrasonic ranging module and the conveyor belt in the first direction, wherein the first direction is an arbitrary direction. Therefore, when the distance between the ultrasonic ranging module and the conveyor belt is constant, the monitoring background can timely discover problems that occur in the conveyor belt tear detection device during operation by obtaining the analysis result of whether the time in the detection information is within the above-mentioned preset time interval, thereby facilitating the optimization of the performance of the conveyor belt tear detection device.

[0038] Exemplarily, the detection information in the above-mentioned detection signal can also be the preset signal frequency of the first ultrasonic signal and the second ultrasonic signal. Therefore, when the distance between the ultrasonic ranging module and the conveyor belt is constant, the monitoring background can obtain the analysis result of whether the signal frequency in the detection information is consistent with the preset signal frequency, and promptly discover the problems arising from the operation of the conveyor belt tear detection device, thereby facilitating the optimization of the performance of the conveyor belt tear detection device.

[0039] In order to enable the staff to promptly discover the conveyor belt tearing, in some optional embodiments, the conveyor belt tearing detection device also includes an alarm module, which is communicatively connected to the ultrasonic ranging module and is used for issuing an alarm signal when the detection signal indicates that the conveyor belt is in the above-mentioned torn state.

[0040] The alarm module may emit a sound signal and / or a flash signal. For example, the alarm module may be an acoustic and visual alarm module. That is, when the detection signal of the ultrasonic ranging module indicates that the conveyor belt is in a torn state, the ultrasonic ranging module may directly drive the acoustic and visual alarm module to perform an on-site acoustic and visual alarm, thereby notifying the staff.

[0041] Optionally, in some other optional embodiments, the conveyor belt tear detection device may further include an induction alarm device, which may be provided with a receiving tray, and the induction alarm device may be arranged side by side with the ultrasonic ranging module. Thus, when the induction alarm device senses that material has fallen on its receiving tray, it may be considered that the conveyor belt has been torn, and an alarm signal may be output.

[0042] Optionally, in other optional embodiments, the above-mentioned sensing alarm device can also be arranged at the lower side of the ultrasonic ranging module, so that when the conveyor belt is torn, the ultrasonic ranging module will not prevent the material from falling onto the receiving tray of the sensing alarm device, thereby not affecting the sensing alarm device to output the alarm signal.

[0043] Exemplarily, the above-mentioned sensing alarm device may include but is not limited to a pressure sensor and a vibration sensor.

[0044] In order to be able to timely control the operation of the conveyor belt when the conveyor belt is in a torn state, in some optional embodiments, the conveyor belt tear detection device also includes a switch output module, and the switch output module is communicatively connected to the ultrasonic ranging module for outputting a longitudinal tear fault signal to the control console when the detection signal indicates that the conveyor belt is in the torn state.

[0045] Specifically, the switch output module can convert the detection signal into a switch quantity and output it to the console, so that the console can control the operation of the conveyor belt. For example, when the detection signal indicates that the conveyor belt is in a torn state, the switch output module can output a switch quantity so that the console controls the conveyor belt to stop running.

[0046] In some optional embodiments, the conveyor belt tear detection device further includes a waveguide tube, which is located at a critical position of the conveyor belt and is used to transmit the first ultrasonic signal and the second ultrasonic signal, and the critical position is a position where the conveyor belt is prone to longitudinal tearing.

[0047] Exemplarily, the position where the conveyor belt is prone to tearing may be a position aligned with the feed trough. Therefore, the roller unit may include a buffer roller, which is located below the position aligned with the feed trough. The portion of the conveyor belt between the feed trough and the buffer roller is the above-mentioned critical position.

[0048] Specifically, after the waveguide is set at the above key position, if the conveyor belt is in a normal state, the first ultrasonic signal and the second ultrasonic signal passing through the waveguide are both normal signals; however, if the conveyor belt is in a torn state, the waveguide at this location will be damaged due to bending, so that the first ultrasonic signal and the second ultrasonic signal passing through the waveguide are in different states, so that the detection signal obtained by the ultrasonic ranging module indicates that the conveyor belt is in a torn state. Furthermore, if the conveyor belt tear detection device includes the above-mentioned switch output module, the console can drive the motor to stop rotating at this time, thereby controlling the conveyor belt to stop running and preventing the conveyor belt tear accident from expanding.

[0049] The waveguide can be used alone, or multiple waveguides can be distributed at different nodes in the conveyor belt tear detection device. For example, in some optional embodiments, the number of the waveguides is multiple, and the multiple waveguides are spaced apart along the length direction of the conveyor belt.

[0050] In some optional embodiments, the ultrasonic ranging module may include an ultrasonic signal generating device, an ultrasonic signal receiving device and an ultrasonic signal analyzing device. The ultrasonic generating device is used to generate the first ultrasonic signal; the ultrasonic signal receiving device is used to receive the second ultrasonic signal; and the ultrasonic signal analyzing device is used to perform signal processing on the second ultrasonic signal.

[0051] In the above embodiment, the ultrasonic signal generating device is used to continuously send the first ultrasonic signal on one side of the conveyor belt. The ultrasonic signal receiving device can receive the reflected second ultrasonic signal in real time, amplify and detect the second ultrasonic signal, and then send the processed second ultrasonic signal to the ultrasonic signal analysis device. The ultrasonic signal analysis device has a microprocessor module, which can perform real-time signal processing on the received second ultrasonic signal to obtain a detection signal. Optionally, the above microprocessor can send the above detection signal to the monitoring background and / or at least one of the following modules: a display module, an alarm module and a switch output module.

[0052] In addition, the above-mentioned microprocessor module can compare the detection signal with the built-in judgment threshold in real time to determine whether the real-time detection signal is less than the judgment threshold; if the detection signal is less than the judgment threshold, it is determined that the conveyor belt state of the conveyor belt is in a normal state; if the detection signal is greater than or equal to the judgment threshold, it is determined that the conveyor belt state of the conveyor belt is in a torn state. Exemplarily, when it is determined that the conveyor belt state is in a normal state, the above-mentioned detection signal can be directly sent to the display module and / or the monitoring background; when it is determined that the conveyor belt state is in a torn state, the alarm module and / or the switch output module are triggered, so that when the alarm module is triggered, the alarm module sends an alarm signal, and when the switch output module is triggered, the switch output module outputs a longitudinal tear fault signal to the console.

[0053] In order to enable the conveyor belt status to be detected in time throughout the entire width direction of the conveyor belt, in some optional implementations, such as Figure 3 and Figure 4 As shown, the ultrasonic ranging module 200 may include a plurality of them, and the plurality of ultrasonic ranging modules 200 are spaced apart along the width direction A' of the conveyor belt (the object to be measured 100). When the conveyor belt (the object to be measured 100) is in a normal state, the distance between the ultrasonic ranging module 200 and the conveyor belt (the object to be measured 100) may be L1.

[0054] In order to prevent the articles or materials placed on the conveyor belt from leaking from the conveyor belt, in some optional embodiments, such as Figure 4 As shown, the above-mentioned roller unit includes a first roller unit 10, a second roller unit 20 and a third roller unit 30; the above-mentioned first roller unit 10, the above-mentioned second roller unit 20 and the above-mentioned third roller unit 30 are connected in sequence to form an inverted trapezoidal groove structure; the above-mentioned conveyor belt (the object to be measured 100) is located on the side wall and the bottom of the above-mentioned groove structure.

[0055] Specifically, the angle between the first roller unit 10 and the second roller unit 20 is A, and the angle between the second roller unit 20 and the third roller unit 30 is B. Both the angle A and the angle B are obtuse angles.

[0056] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0057] According to the technical solution of the present application, a conveyor belt tear detection device includes a conveyor belt, a roller unit and an ultrasonic ranging module, wherein the conveyor belt is used to place and transport items, the roller unit is used to support the conveyor belt, and the ultrasonic ranging module is located below the conveyor belt, and is used to send a first ultrasonic signal to the conveyor belt, and after the first ultrasonic signal collides with the object to be detected, receive a second ultrasonic signal reflected from the object to be detected, and perform signal processing on the second ultrasonic signal to obtain a detection signal, and the detection signal is used to characterize the conveyor belt state of the conveyor belt, and the conveyor belt state includes the conveyor belt being in a normal state or the conveyor belt being torn. Since the ultrasonic ranging module in the present application can be applied to occasions with complex working conditions such as dust and water spray, therefore, in a complex underground environment, the first ultrasonic signal can be directly sent to the conveyor belt through the ultrasonic ranging module, and according to the received second sound wave signal, it is determined whether the conveyor belt state of the conveyor belt is in a normal state or in a torn state, so that the detection result of the conveyor belt tear detection device has better real-time performance and higher reliability.

[0058] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A conveyor belt tear detection device, characterized in that: It includes a conveyor belt, a roller unit and an ultrasonic distance measurement module, wherein: The conveyor belt is used to place and convey items; The roller unit is used to support the conveyor belt; The ultrasonic ranging module is located below the conveyor belt, and is used to send a first ultrasonic signal to the conveyor belt, and after the first ultrasonic signal collides with the object to be measured, receive a second ultrasonic signal reflected from the object to be measured, and perform signal processing on the second ultrasonic signal to obtain a detection signal, wherein the detection signal is used to characterize the conveyor belt state of the conveyor belt, and the conveyor belt state includes that the conveyor belt is in a normal state or the conveyor belt is in a torn state; The detection device also includes: The monitoring background is connected to the ultrasonic ranging module for receiving the detection signal and monitoring the operation status of the conveyor belt tear detection device according to the detection signal and the operation index of the conveyor belt tear detection device.

2. The detection device according to claim 1, characterized in that: The detection device also includes: The display module is connected to the ultrasonic ranging module for receiving and displaying the detection information in the detection signal.

3. The detection device according to claim 1, characterized in that: The detection device also includes: The alarm module is communicatively connected with the ultrasonic ranging module, and is used for sending an alarm signal when the detection signal indicates that the conveyor belt is in the torn state.

4. The detection device according to claim 1, characterized in that: The detection device also includes: The switch output module is connected to the ultrasonic ranging module for outputting a longitudinal tear fault signal to the control console when the detection signal indicates that the conveyor belt is in the tear state.

5. The detection device according to claim 1, characterized in that: The detection device also includes: The waveguide is located at a key position of the conveyor belt and is used to transmit the first ultrasonic signal and the second ultrasonic signal. The key position is a position where the conveyor belt is prone to longitudinal tearing.

6. The detection device according to claim 5, characterized in that: There are multiple waveguide tubes, and the multiple waveguide tubes are spaced apart and distributed along the length direction of the conveyor belt.

7. The detection device according to any one of claims 1 to 6, characterized in that: The ultrasonic ranging module comprises: An ultrasonic signal generating device, used for generating the first ultrasonic signal; An ultrasonic signal receiving device, used for receiving the second ultrasonic signal; The ultrasonic signal analysis device is used to perform signal processing on the second ultrasonic signal.

8. The detection device according to any one of claims 1 to 6, characterized in that: The ultrasonic distance measuring modules include a plurality of them, and the plurality of ultrasonic distance measuring modules are distributed at intervals along the width direction of the conveyor belt.

9. The detection device according to any one of claims 1 to 6, characterized in that: The roller unit includes a first roller unit, a second roller unit and a third roller unit; the first roller unit, the second roller unit and the third roller unit are connected in sequence to form an inverted trapezoidal groove structure; the conveyor belt is located on the side wall and the bottom of the groove structure.

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