Belt tear detection device and detection method thereof

Abstract

This application relates to the field of belt tear detection and discloses a belt tear detection device and method. The device includes: a light source, located on the side of the return belt away from the carrier belt, for emitting light toward the return belt; an optical measuring instrument, located between the return belt and the carrier belt, for collecting light intensity and illuminance on the back of the return belt; and a processor for determining whether there is a tear on the return belt based on the light intensity and illuminance collected by the optical measuring instrument. This non-contact method utilizes optical principles to directly detect belt tears. The mechanical structure of the device is relatively simple and does not require physical triggering conditions.

Description

Technical Field

[0001] The present invention relates to the field of conveying equipment detection, and in particular to a belt tear detection device and a detection method thereof. Background Art

[0002] Belt conveyors are essential equipment for transporting materials in numerous industries, including ports, metallurgy, mining, chemicals, petroleum, power plants, and building materials. As a crucial component of conveyors, the conveyor belt primarily serves to connect the drive unit and the material being transported. During actual production, conveyor belts can be punctured by sharp objects or deviate. If inspectors fail to detect these problems in time, extensive belt tears can cause cargo to spill, paralyzing the entire conveyor and, in severe cases, resulting in casualties among inspectors, causing significant economic losses to the company.

[0003] Conveyor belt tears can occur in two forms: longitudinal and transverse. Field investigations have revealed that longitudinal tears account for over 95% of belt tear statistics. Longitudinal tears primarily occur from belt deviation, longitudinal scratches, and belt core tearing. Belt tears caused by deviation generally have warning signs, and the transition from deviation to tearing typically takes a long time, making them easily detectable during belt inspection and maintenance. Core tearing is a phenomenon specific to belts containing steel wire. Longitudinal scratches and tears are more likely to cause problems during actual production.

[0004] Currently, conveyor belt detection methods generally rely on mechanical triggering. The principle is that the physical information at the belt tear site changes, and a sensing device identifies this change to determine if the belt is torn. Sensing devices include, but are not limited to, leakage sensors, proximity switches, tension cables, limit switches, electromagnetic induction, limit switches, arresting locks, and pressure locks. However, these methods require complex mechanical structures and require contact with the belt tear site or leaked material before determining if a fault has occurred. This can easily lead to accidental triggering in the external environment. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a belt tear detection device and detection method, which adopts a non-contact method and uses optical principles to directly detect belt tears. The mechanical structure of the device is relatively simple. The specific scheme is as follows:

[0006] A belt tear detection device, comprising:

[0007] a light source, located on a side of the return belt away from the carrier belt, for emitting light toward the return belt;

[0008] an optical measuring instrument, located between the return belt and the carrying belt, for collecting light intensity and illuminance on the back of the return belt;

[0009] The processor is used to determine whether there is a tear on the return belt based on the light intensity and illumination collected by the optical measuring instrument.

[0010] Preferably, the belt tear detection device provided in the embodiment of the present invention further includes:

[0011] A light shield is used to cover the optical measuring instrument.

[0012] Preferably, in the above-mentioned belt tear detection device provided by the embodiment of the present invention, the light shield covers the width area of ​​the return belt.

[0013] Preferably, in the above-mentioned belt tear detection device provided in the embodiment of the present invention, the optical measuring instrument includes a photometer and an illuminometer;

[0014] The photometer and the illuminometer are located in a corner of the light shield.

[0015] Preferably, in the above-mentioned belt tear detection device provided in an embodiment of the present invention, the processor is specifically used to determine that there is a tear on the return belt when the light intensity collected by the optical measuring instrument is not less than the light intensity setting threshold, and the light illuminance collected by the optical measuring instrument is not less than the light illuminance setting threshold.

[0016] Preferably, in the above-mentioned belt tear detection device provided in the embodiment of the present invention, the processor is further used to obtain the position of the tear point from the edge of the return belt.

[0017] Preferably, in the belt tear detection device provided in the embodiment of the present invention, the processor is further configured to obtain the distance between the tear point and the edge of the return belt using the following formula:

[0018]

[0019] Wherein, D is the distance between the tearing point and the edge of the return belt, I 测 is the light intensity collected by the optical measuring instrument, E 测 is the illuminance collected by the optical measuring instrument, H is the height of the probe of the optical measuring instrument from the return belt, and L2 is the distance between the projection point of the optical measuring instrument on the return belt and the edge of the return belt.

[0020] The embodiment of the present invention further provides a detection method of the belt tear detection device as provided in the embodiment of the present invention, comprising:

[0021] A light source located on a side of the return belt away from the carrier belt emits light toward the return belt;

[0022] An optical measuring instrument located between the return belt and the carrier belt collects light intensity and illuminance on the back of the return belt;

[0023] It is determined whether there is a tear on the return belt based on the light intensity and illumination collected by the optical measuring instrument.

[0024] Preferably, in the detection method of the belt tear detection device provided in an embodiment of the present invention, judging whether there is a tear on the return belt based on the light intensity and illuminance collected by the optical measuring instrument includes:

[0025] When the light intensity collected by the optical measuring instrument is not less than a set light intensity threshold, and the light illuminance collected by the optical measuring instrument is not less than a set illuminance threshold, it is determined that there is a tear on the return belt.

[0026] Preferably, in the detection method of the belt tear detection device provided in the embodiment of the present invention, the method further includes:

[0027] The distance between the tearing point and the edge of the return belt is obtained.

[0028] It can be seen from the above technical solution that the belt tear detection device provided by the present invention includes: a light source, located on the side of the return belt away from the carrier belt, for emitting light to the return belt; an optical measuring instrument, located between the return belt and the carrier belt, for collecting the light intensity and illuminance on the back of the return belt; a processor, for judging whether there is a tear on the return belt based on the light intensity and illuminance collected by the optical measuring instrument.

[0029] The above-mentioned belt tear detection device provided by the present invention can directly determine whether the belt is torn by reflecting the light source without contact, using the light intensity and illuminance of the optical measuring instrument on the other side of the belt. In this way, the belt tear condition can be directly detected by optical principles in a contactless manner. The mechanical structure device is relatively simple and does not require physical triggering conditions.

[0030] In addition, the present invention also provides a corresponding detection method for the belt tear detection device, which further makes the above-mentioned detection device more practical, and the detection method has corresponding advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0032] Figure 1 A schematic structural diagram of a belt tear detection device provided by an embodiment of the present invention;

[0033] Figure 2 A schematic cross-sectional view of a belt tear detection device provided by an embodiment of the present invention in the belt travel direction;

[0034] Figure 3 A schematic diagram of the relationship between the optical measuring instrument provided by an embodiment of the present invention and the torn portion of the belt;

[0035] Figure 4 A schematic diagram of the location of a belt tear provided by an embodiment of the present invention;

[0036] Figure 5 This is a flow chart of the detection method of the belt tear detection device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] The present invention provides a belt tear detection device, such as Figure 1 As shown, including:

[0039] The light source 1 is located on the side of the return belt 2 away from the carrier belt 3 and is used to emit light toward the return belt 2;

[0040] The optical measuring instrument 4 is located between the return belt 2 and the carrying belt 3 and is used to collect the light intensity and illuminance on the back of the return belt 2;

[0041] The processor is used to determine whether there is a tear on the return belt 2 based on the light intensity and illumination collected by the optical measuring instrument 4.

[0042] It should be noted that the return belt 2 and the carrying belt (i.e., the outbound belt) 3 form a conveyor belt loop. During the transport process, the belt running on top is called the carrying belt 3, with rollers 5 installed on its lower surface. The belt running below is called the return belt 2. In other words, the carrying belt 3 and the return belt 2 are constantly changing during transport; determining whether there are tears on the return belt 2 also means determining whether there are tears on the entire conveyor belt.

[0043] Preferably, the light source 1 is located below the return belt 2 and faces the belt carrying surface. The optical measuring instrument 4 is fixed between the return belt 2 and the carrying belt, and faces downward, that is, toward the back of the return belt 2.

[0044] In the above-mentioned belt tear detection device provided in the embodiment of the present invention, it is possible to directly determine whether the belt is torn by reflecting the light source without contact and using the light intensity and illuminance of the optical measuring instrument on the other side of the belt. In this way, a contactless method is used to directly detect the tearing of the belt using optical principles. The mechanical structure device is relatively simple, does not require physical trigger conditions, and has little dependence on computing hardware.

[0045] Furthermore, in the specific implementation, in the above-mentioned belt tear detection device provided by the embodiment of the present invention, since the present invention is relatively sensitive to light, in order to prevent interference from external light sources, such as Figure 1 and Figure 2 As shown, it may further include: a light shield 6 for covering the optical measuring instrument 4. The light shield 6 can shield the optical measuring instrument 4 from light, ensuring that the incident light source only comes from the torn part of the belt. Figure 2 A is the running direction of the carrying belt 3, B is the running direction of the return belt 2, and C is the crack of the belt.

[0046] Preferably, the light shield 6 can cover the entire width of the return belt 2. This ensures that the entire transport belt can be detected.

[0047] In a specific implementation, in the above-mentioned belt tear detection device provided by the embodiment of the present invention, the optical measuring instrument 4 may include a photometer and an illuminometer; the photometer and the illuminometer are both located in a corner of the light shield 6. Figure 2 For example, the photometer and the illuminometer are both located in the upper left corner of the light shield 6.

[0048] In specific implementation, in the above-mentioned belt tear detection device provided in an embodiment of the present invention, the processor can be specifically used to determine that there is a tear on the return belt when the light intensity collected by the optical measuring instrument is not less than the light intensity setting threshold, and the light illuminance collected by the optical measuring instrument is not less than the light illuminance setting threshold.

[0049] like Figure 3 As shown, when the belt is torn and runs over the light source 1, the light from below will shine into the upper light shield 6 through the gap C at the torn part of the belt. At this time, the photometer and illuminance meter can sense the light intensity and illuminance. When both measured values ​​exceed the set threshold at the same time, it is determined that the belt is torn. The discriminant formula is:

[0050]

[0051] Among them, E 测 is the measured value of the illuminometer (i.e. the illuminance collected by the optical measuring instrument), E 测 Set a threshold for illumination, I 测 is the measured value of the photometer (i.e. the light intensity collected by the optical measuring instrument), I 阈 Set a threshold for light intensity.

[0052] Furthermore, in a specific implementation, in the above-mentioned belt tear detection device provided in an embodiment of the present invention, the processor can also be used to obtain the position of the tear point C from the edge of the return belt 2.

[0053] like Figure 4 As shown, when the belt is torn and runs above the light source 1, the light from below will shine into the upper light shield 6 through the gap C at the torn part of the belt. At this time, the photometer and illuminance meter can sense the specific values ​​of light intensity and illuminance. According to the relationship between illuminance and distance, the formula is:

[0054] E=I / R 2

[0055] Where R is the distance between the optical measuring instrument and the light at the tear point C on the belt.

[0056] Thus we can deduce:

[0057]

[0058] It should be noted that the belt tear detection device provided in the embodiment of the present invention can be understood as a line scanning device. Its width is the same as the belt width, and its thickness is very small. In actual production, it should be set to ≤=1cm and can be ignored. That is, the device is regarded as performing a light line scan on the belt. Then, the photometer and the illuminometer are circles, with R as the radius, and a circle is drawn at this cross section, such as Figure 4 As shown by the dotted circle in the middle, the intersection of the virtual circle and the belt in space is the belt tear point C.

[0059] The installation positions of the photometer and illuminometer are known, that is, the height of their probes from the belt is H, and the distance from their projection points on the belt to the edge of the belt is L2.

[0060] Then we can deduce the distance D between the tear point and the belt edge:

[0061] D=L1+L2

[0062] but:

[0063]

[0064] but:

[0065]

[0066] but:

[0067]

[0068] Where D is the distance between the tear point and the edge of the return belt, I 测 is the light intensity collected by the optical measuring instrument, E 测 is the illuminance collected by the optical measuring instrument, H is the height of the optical measuring instrument's probe from the return belt, and L2 is the distance between the optical measuring instrument's projection on the return belt and the edge of the return belt. This approach can be implemented without relying on high-performance computers, requiring minimal computing hardware, and thus reducing the overuse of computing resources.

[0069] When installing the above belt tear detection device, it is important to note that first, the light shielding effect of the light shield should be ensured, and secondly, the L2 distance should be as small as possible so that most of the tears are on the other side of the installation position. If there is still light leakage after the light shielding, then E 阈 , I 阈 Ambient light intensity should be taken into consideration.

[0070] Based on the same inventive concept, an embodiment of the present invention also provides a detection method for a belt tear detection device. Since the principle of solving the problem by this method is similar to that of the aforementioned belt tear detection device, the implementation of this method can refer to the implementation of the belt tear detection device, and the repeated parts will not be repeated.

[0071] In specific implementation, the detection method of the belt tear detection device provided by the embodiment of the present invention is as follows: Figure 5 As shown, the specific steps include:

[0072] S501, a light source located on a side of the return belt away from the loading belt emits light toward the return belt;

[0073] S502, an optical measuring instrument located between the return belt and the carrier belt collects light intensity and illuminance on the back of the return belt;

[0074] S503: Determine whether there is a tear on the return belt based on the light intensity and illumination collected by the optical measuring instrument.

[0075] In the detection method of the above-mentioned belt tear detection device provided in an embodiment of the present invention, it is possible to directly determine whether the belt is torn by reflecting a light source without contact, using the light intensity and illuminance of an optical measuring instrument on the other side of the belt. In this way, the tearing of the belt can be directly detected by optical principles in a contactless manner without the need for physical triggering conditions.

[0076] In a specific implementation, in the detection method of the above-mentioned belt tear detection device provided in an embodiment of the present invention, step S503 determines whether there is a tear on the return belt based on the light intensity and illuminance collected by the optical measuring instrument. Specifically, it may include: when the light intensity collected by the optical measuring instrument is not less than the light intensity setting threshold, and the light illuminance collected by the optical measuring instrument is not less than the illuminance setting threshold, it is determined that there is a tear on the return belt.

[0077] In a specific implementation, the detection method of the belt tear detection device provided in the embodiment of the present invention may further include: obtaining the position of the tear from the edge of the return belt.

[0078] Specifically, the following formula can be used to obtain the distance between the tear point and the edge of the return belt:

[0079]

[0080] Where D is the distance between the tear point and the edge of the return belt, I 测 is the light intensity collected by the optical measuring instrument, E 测 is the illuminance collected by the optical measuring instrument, H is the height of the optical measuring instrument's probe from the return belt, and L2 is the distance between the optical measuring instrument's projection point on the return belt and the edge of the return belt.

[0081] For more specific working processes of the above steps, please refer to the corresponding contents disclosed in the above embodiments, which will not be repeated here.

[0082] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from the other embodiments. Reference will be made to the description of the detection methods disclosed in the embodiments for the same or similar parts. Since the detection methods described in the embodiments correspond to the detection devices disclosed in the embodiments, their description is relatively simple. For relevant details, refer to the description of the detection devices.

[0083] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the components and steps of each example according to their functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0084] In summary, an embodiment of the present invention provides a belt tear detection device, comprising: a light source, located on the side of the return belt away from the carrier belt, for emitting light to the return belt; an optical measuring instrument, located between the return belt and the carrier belt, for collecting light intensity and illuminance on the back of the return belt; a processor, for determining whether there is a tear on the return belt based on the light intensity and illuminance collected by the optical measuring instrument. The above-mentioned belt tear detection device can directly determine whether the belt is torn by reflecting the light source without contact, using the light intensity and illuminance of the optical measuring instrument on the other side of the belt. In this way, the belt tear can be directly detected by optical principles in a contactless manner. The mechanical structure of the device is relatively simple and does not require physical triggering conditions. In addition, the present invention also provides a corresponding detection method for the belt tear detection device, which further makes the above-mentioned detection device more practical. The detection method has corresponding advantages.

[0085] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0086] The belt tear detection device and detection method provided by the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A belt tear detection device, characterized in that: include: a light source, located on a side of the return belt away from the carrier belt, for emitting light toward the return belt; an optical measuring instrument, located between the return belt and the carrying belt, for collecting light intensity and illuminance on the back of the return belt; a processor, configured to determine whether there is a tear on the return belt based on the light intensity and illuminance collected by the optical measuring instrument, and to determine that there is a tear on the return belt when the light intensity collected by the optical measuring instrument is not less than a set light intensity threshold and the light illuminance collected by the optical measuring instrument is not less than a set illuminance threshold; and further configured to obtain a position of the tear from the edge of the return belt using the following formula: ； in, is the distance between the tearing point and the edge of the return belt, is the light intensity collected by the optical measuring instrument, is the illuminance collected by the optical measuring instrument, is the height of the probe of the optical measuring instrument from the return belt, is the distance between the projection point of the optical measuring instrument on the return belt and the edge of the return belt.

2. The belt tear detection device according to claim 1, characterized in that: Also includes: A light shield is used to cover the optical measuring instrument.

3. The belt tear detection device according to claim 2, characterized in that: The light shield covers the width area of ​​the return belt.

4. The belt tear detection device according to claim 3, characterized in that: The optical measuring instruments include a photometer and an illuminometer; The photometer and the illuminometer are located in a corner of the light shield.

5. A detection method for the belt tear detection device according to any one of claims 1 to 4, characterized in that: include: A light source located on a side of the return belt away from the carrier belt emits light toward the return belt; An optical measuring instrument located between the return belt and the carrier belt collects light intensity and illuminance on the back of the return belt; Based on the light intensity and illuminance collected by the optical measuring instrument, it is determined whether there is a tear on the return belt. When the light intensity collected by the optical measuring instrument is not less than a set light intensity threshold, and the light illuminance collected by the optical measuring instrument is not less than a set illuminance threshold, it is determined that there is a tear on the return belt. The position of the tear from the edge of the return belt is obtained using the following formula: ； in, is the distance between the tearing point and the edge of the return belt, is the light intensity collected by the optical measuring instrument, is the illuminance collected by the optical measuring instrument, is the height of the probe of the optical measuring instrument from the return belt, is the distance between the projection point of the optical measuring instrument on the return belt and the edge of the return belt.

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