Online safety monitoring system and method for conveying belt for coal mine

Abstract

An on-line safety monitoring system for a conveying belt for a coal mine comprises a steel rope core detection device and a plurality of tearing detection devices. The tearing detection device comprises a plurality of tearing detection mechanisms, the lower half portion of the conveying belt passes through the steel rope core detection device and then sequentially passes through the side portions of all the tearing detection mechanisms, and each tearing detection mechanism comprises an extrusion stretching assembly arranged between the upper half portion and the lower half portion of the conveying belt and a camera arranged below the lower half portion. Wherein the extruding and stretching assembly is used for extruding the lower half part downwards to enable the lower half part to form at least one expanding part protruding downwards, the camera is used for shooting the expanding parts, and the positions of the expanding parts formed by extruding the lower half part through different extruding and stretching assemblies in the width direction of the conveying belt are different. When whether the conveying belt is torn or not is detected, the unfolding part can be formed on the conveying belt by extruding the stretching assembly, so that cracks on the surface of the conveying belt are widened, and it is guaranteed that the cracks can be smoothly detected.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine safety monitoring, and specifically relates to an on-line safety monitoring system and method for a coal mine conveyor belt. Background Art

[0002] The conveyor belt is one of the important devices in the coal mine underground, undertaking the important task of transporting raw coal. During the use of the conveyor belt, due to the large load and continuous friction with the raw coal, it is very easy to be damaged. There are two common types of damage. The first is that the wire rope core of the conveyor belt breaks, and the second is that cracks appear on the body of the conveyor belt. Both types of damage may cause the conveyor belt to be severely torn, thus triggering a safety accident. Therefore, it is necessary to pay close attention to whether the conveyor belt is damaged.

[0003] For the first type of damage, a technology similar to wire rope flaw detection is mainly used. After magnetizing the rope core, the magnetic field generated by the rope core is detected to determine whether there are damages such as broken wires in the rope core. This technology is already very mature. For example, the conveyor belt steel wire rope core flaw detection device with the model number KJ577 produced by Luoyang Test Flaw Detection Technology Co., Ltd. can realize the on-line monitoring of the rope core.

[0004] For the second type of damage, the traditional technology is to conduct contact detection on the conveyor belt during its operation. For example, the Chinese patent application with the application number 201510580760.9 proposed by Luoyang Test Flaw Detection Technology Co., Ltd. discloses a conveyor belt tear detection device, which contacts the conveyor belt through the probe of the detector. When there is a crack on the surface of the conveyor belt, the probe can be inserted into the crack, thereby realizing the detection. This contact detection has problems of limited coverage range and high failure rate.

[0005] With the rapid development of technologies such as machine vision and neural networks, the non-contact detection technology based on images has gradually been applied to the detection of the second type of damage. By taking pictures of the surface of the conveyor belt and then identifying the images, it can be determined whether there are cracks on the surface of the conveyor belt. Compared with the traditional contact detection, this technology can comprehensively cover the conveyor belt without dead corners, is not prone to failure, and has a long service life.

[0006] However, because the conveyor belt mainly transports raw coal in the coal mine, its surface is very easy to adhere to some fine coal dust, which may block some small cracks, resulting in the inability to smoothly detect whether there are cracks on the surface of the conveyor belt from the images. Summary of the Invention

[0007] In order to solve the deficiencies in the prior art, the present invention provides an on-line safety monitoring system and method for a coal mine conveyor belt, which can automatically detect whether the conveyor belt is torn or damaged and whether the rope core is broken during the operation of the coal mine conveyor belt. When detecting whether the conveyor belt is torn or damaged, an unfolding part can be formed on the conveyor belt through an extrusion and stretching component, so as to widen the crack on the surface of the conveyor belt and ensure that the crack can be successfully detected.

[0008] To achieve the above object, the specific solution adopted by the present invention is: an on-line safety monitoring system for a coal mine conveyor belt, including a steel rope core detection device and a plurality of tear detection devices; The steel rope core detection device includes two magnetic detection components. During the operation of the conveyor belt, the lower half of the conveyor belt passes by the sides of the two magnetic detection components in sequence. The first magnetic detection component is used to generate a magnetic field to magnetize the rope core of the conveyor belt, and the second magnetic detection component is used to detect the magnetized rope core. The tear detection device includes a plurality of tear detection mechanisms. After the lower half of the conveyor belt passes through the steel rope core detection device, it passes by the sides of all the tear detection mechanisms in sequence. The tear detection mechanism includes an extrusion and stretching component arranged between the upper half and the lower half of the conveyor belt and a camera arranged below the lower half. The extrusion and stretching component is used to squeeze the lower half downward to form at least one downwardly bulging unfolding part, and the camera is used to photograph the unfolding part. The positions of the unfolding parts formed by different extrusion and stretching components squeezing the lower half in the width direction of the conveyor belt are different.

[0009] As a further optimization of the above on-line safety monitoring system for a coal mine conveyor belt: the steel rope core detection device includes two connecting bars fixedly arranged on the frame of the conveyor belt, and the connecting bars extend along the width direction of the conveyor belt. A downwardly extending hanging rod is fixedly connected to each end of the connecting bar. The hanging rods connected by the two connecting bars correspond one by one and are jointly fixedly connected to a cross bar. The cross bar extends along the conveying direction of the conveyor belt. Two mounting grooves extending along the width direction of the conveyor belt are fixedly connected between the two cross bars. The magnetic detection component is fixedly arranged on the mounting groove, and a wire passing space for the power supply wire and signal wire of the magnetic detection component to pass through is formed inside the mounting groove.

[0010] As a further optimization of the above-mentioned on-line safety monitoring system for coal mine conveyor belts: The extrusion and stretching assembly includes a substrate fixedly arranged on the frame of the conveyor belt, and the substrate is parallel to the lower half. At least one screw hole is provided on the substrate, and a screw is fitted in the screw hole. The lower end of the screw is rotatably connected to a pressing rod extending downward, and the lower end of the pressing rod is rotatably connected to an extrusion wheel. The axis of the extrusion wheel is parallel to the width direction of the conveyor belt. During the rotation of the screw, it can move downward and push the pressing rod and the extrusion wheel to move synchronously until the extrusion wheel contacts the lower half and extrudes the lower half to form the unfolding part.

[0011] As a further optimization of the above-mentioned on-line safety monitoring system for coal mine conveyor belts: The substrate is fixedly connected with at least one group of guide rods corresponding to the pressing rod. The number of each group of guide rods is set to two. The guide rods are provided with second chutes extending up and down, and the two second chutes are arranged oppositely. The pressing rod is fixedly connected with a follower rod, and the two ends of the follower rod are respectively inserted into the two second chutes.

[0012] As a further optimization of the above-mentioned on-line safety monitoring system for coal mine conveyor belts: The extrusion and stretching assembly includes at least one group of auxiliary lifting assemblies. The number of each group of auxiliary lifting assemblies is two. The auxiliary lifting assembly includes a support plate fixedly connected to the frame of the conveyor belt, and the support plate is used to support the lower half of the conveyor belt.

[0013] As a further optimization of the above-mentioned on-line safety monitoring system for coal mine conveyor belts: The tearing detection mechanism includes a lighting assembly for illuminating the unfolding part, and the lighting assembly is located on the side of the camera facing away from the unfolding part.

[0014] As a further optimization of the above-mentioned on-line safety monitoring system for coal mine conveyor belts: The lighting assembly includes a first mounting rod fixedly arranged on the frame of the conveyor belt, and the first mounting rod extends up and down. The first mounting rod is provided with a first chute extending along the length direction. A sliding block is slidably arranged in the first chute. A part of the sliding block extends out of the first chute and is fixedly connected with a connecting plate. The connecting plate is fixedly connected with a first mounting plate, and a light box for emitting light is fixedly arranged on the first mounting plate, and the light box faces the unfolding part.

[0015] As a further optimization of the above-mentioned on-line safety monitoring system for coal mine conveyor belts: The tearing detection mechanism includes a bottom plate fixedly arranged on the frame of the conveyor belt, and a telescopic rod is vertically fixedly arranged on the bottom plate. The camera is rotatably arranged on the top of the telescopic rod.

[0016] An on-line safety monitoring method for coal mine conveyor belts, based on the above-mentioned on-line safety monitoring system for coal mine conveyor belts, the method includes the following steps: Use the steel cord core detection device to detect the cord core inside the conveyor belt and obtain cord core health data; Use the extrusion and stretching assembly in the tear detection mechanism to squeeze the lower half of the conveyor belt downward, so that the lower half forms an unfolded part that bulges downward; Use the camera in the tear detection mechanism to take a detection image of the unfolded part; Identify the detection image to obtain belt health data and damage location data; Locate the cord core health data and belt health data based on the damage location data.

[0017] As a further optimization of the above-mentioned on-line safety monitoring method for a coal mine conveyor belt: The method for identifying the detection image to obtain damage location data includes: Extract at least one marker from the detection image; Determine the detection base point according to the marker; Generate damage location data according to the detection base point and the running speed of the conveyor belt.

[0018] Beneficial effects: The present invention can automatically detect whether there are tear damages on the conveyor belt and whether there are damages such as broken wires in the cord core during the operation of the coal mine conveyor belt, and thus can grasp the health condition of the conveyor belt in real time, avoiding safety accidents caused by faults such as belt breakage; when detecting whether there are tear damages on the conveyor belt, the tear detection device of the present invention can form an unfolded part on the conveyor belt by setting an extrusion and stretching assembly, so as to widen the crack on the conveyor belt surface, ensure that the crack can be smoothly detected, and thus ensure the accuracy of the detection result. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the conveyor belt; Figure 2 is a schematic structural diagram of the system of the present invention; Figure 3 is a schematic structural diagram of the lighting component; Figure 4 is a schematic structural diagram of the extrusion and stretching assembly; Figure 5 is a schematic diagram of the cooperation mode of the screw and the substrate; Figure 6 is a schematic structural diagram of the steel cord core detection device.

[0020] Description of the Drawings: 1 - cross beam, 2 - support rod, 3 - upper idler, 4 - upper half, 5 - support column, 6 - lower idler, 7 - lower half, 8 - end bracket, 9 - driving roller, 10 - driven roller, 11 - bottom plate, 12 - lighting assembly, 13 - telescopic rod, 14 - camera, 15 - extrusion and stretching assembly, 16 - unfolding part, 17 - steel cord core detection device, 18 - first mounting rod, 19 - first chute, 20 - sliding block, 21 - connecting plate, 22 - first mounting plate, 23 - fastening bolt, 24 - light box, 25 - light homogenizing plate, 26 - second mounting plate, 27 - substrate, 28 - guide rod, 29 - second chute, 30 - follower rod, 31 - operating block, 32 - screw rod, 33 - rotating disk, 34 - accommodating box, 35 - pressing rod, 36 - pressing wheel, 37 - extension rod, 38 - supporting plate, 39 - arc plate, 40 - screw hole, 41 - connecting strip, 42 - hanging rod, 43 - cross bar, 44 - mounting groove, 45 - wire threading space, 46 - magnetic detection assembly, 47 - clamping plate. Detailed Description of the Invention

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0022] As Figure 1 shown, the present invention is applicable to the conveyor belt used in coal mines. During the operation of the conveyor belt, it can be divided into an upper half 4 and a lower half 7, and the raw coal is transported on the upper half 4. The conveyor belt is supported and driven by a frame, and the structure of the frame is as Figure 1 shown. The frame includes two parallel cross beams 1, and the cross beam 1 is supported by a plurality of support columns 5. The two cross beams 1 are connected by a plurality of connecting beams. A plurality of support rods 2 are arranged on the cross beam 1, and the top of the support rod 2 is rotatably connected with an upper idler 3 for supporting the upper half 4. A plurality of lower idlers 6 for supporting the lower half 7 are also rotatably connected to the lower part of the cross beam 1. One end bracket 8 is fixedly connected to each end of the two cross beams 1. A driving roller 9 driven by a motor is rotatably arranged on one of the end brackets 8, and a driven roller 10 is rotatably arranged on the other end bracket 8. The conveyor belt bypasses the driving roller 9 and the driven roller 10, so that the motor can drive the driving roller 9 to rotate, and then the driving roller 9 drives the conveyor belt to run.

[0023] The above is the conventional structure of the conveyor belt for coal mines, and its specific working principle will not be elaborated here.

[0024] As Figure 2As shown in the figure, based on the above-mentioned coal mine conveyor belt, the present invention first provides an on-line safety monitoring system for a coal mine conveyor belt, which includes a steel cord core detection device 17 and a plurality of tearing detection devices.

[0025] The steel cord core detection device 17 includes two magnetic detection components 46. During the operation of the conveyor belt, the lower half 7 of the conveyor belt passes by the sides of the two magnetic detection components 46 in sequence. The first magnetic detection component 46 is used to generate a magnetic field to magnetize the cord core of the conveyor belt, and the second magnetic detection component 46 is used to detect the magnetized cord core.

[0026] The tearing detection device includes a plurality of tearing detection mechanisms. After the lower half 7 of the conveyor belt passes through the steel cord core detection device 17, it passes by the sides of all the tearing detection mechanisms in sequence. The tearing detection mechanism includes a squeezing and stretching component 15 arranged between the upper half 4 and the lower half 7 of the conveyor belt and a camera 14 arranged below the lower half 7. The squeezing and stretching component 15 is used to squeeze the lower half 7 downward to form at least one downwardly bulging unfolded part 16, and the camera 14 is used to photograph the unfolded part 16. The positions of the unfolded parts 16 formed by different squeezing and stretching components 15 squeezing the lower half 7 are different in the width direction of the conveyor belt.

[0027] The present invention is used for safety monitoring of a conveyor belt during operation in a coal mine to avoid accidents caused by conveyor belt damage. During use, a steel cord core detection device 17 is utilized to detect whether there are damages such as broken wires in the cord core of the conveyor belt, and a tear detection device is used to detect whether there are damages such as tears on the surface of the conveyor belt. Specifically, during the operation of the conveyor belt, the lower half 7 first passes by the side of the first magnetic detection component 46. The cord core made of steel wire inside the conveyor belt will be magnetized by the first magnetic detection component 46. The magnetized cord core can form a magnetic field, and the second magnetic detection component 46 can detect the magnetic field formed by the cord core. It is determined whether there are damages such as broken wires in the cord core according to whether there is magnetic flux leakage or other situations. If there are damages such as broken wires in the cord core. After that, the extrusion and stretching component 15 is used to squeeze the lower half 7 downward between the upper half 4 and the lower half 7, so that the lower half 7 forms a downwardly bulging unfolded part 16, and the camera 14 is used to take a detection image of the unfolded part 16. If there is a crack on the surface of the conveyor belt and the crack is located on the unfolded part 16, the crack will be widened. In the detection image, the area corresponding to the crack is larger. Therefore, it is possible to more accurately determine whether there is a crack on the surface of the conveyor belt by identifying the detection image. If there are cracks on the surface of the conveyor belt, and the width of the cracks is large or the number is large, it indicates that there is a risk of tearing of the conveyor belt. On the other hand, because the positions of the unfolded parts 16 formed by squeezing the lower half 7 by different extrusion and stretching components 15 in the width direction of the conveyor belt are different, that is, the positions of the multiple unfolded parts 16 formed by the multiple tear detection mechanisms are different. Therefore, the conveyor belt can be comprehensively detected to avoid dead angles, and the detection results are more sufficient and reliable.

[0028] It should also be noted that in the steel cord core detection device 17, the specific structures and principles of the two magnetic detection components 46 are prior art. For example, a conveyor belt steel cord core flaw detection device with the model number KJ577 produced by Luoyang Test Flaw Detection Technology Co., Ltd. can be adopted.

[0029] As Figure 6 shown, the specific setting method of the steel cord core detection device 17 is as follows: The steel cord core detection device 17 includes two connecting bars 41 fixedly arranged on the frame of the conveyor belt, and the connecting bars 41 extend along the width direction of the conveyor belt. A downwardly extending hanging rod 42 is fixedly connected to each end of the connecting bar 41. The hanging rods 42 connected by the two connecting bars 41 correspond one by one and are jointly fixedly connected with a cross bar 43. The cross bar 43 extends along the conveying direction of the conveyor belt. Two mounting grooves 44 extending along the width direction of the conveyor belt are fixedly connected between the two cross bars 43. The magnetic detection component 46 is fixedly arranged on the mounting groove 44, and a wire passing space 45 for the power supply wire and signal wire of the magnetic detection component 46 to pass through is formed inside the mounting groove 44.

[0030] Further, in order to improve the stability of the magnetic detection component 46 on the installation groove 44, the magnetic detection component 46 is fixedly connected with two parallel clamping plates 47. The two clamping plates 47 are correspondingly attached to the two outer side walls of the installation groove 44, achieving the effect of buckling the magnetic detection component 46 on the installation groove 44, avoiding the skew or tilt of the magnetic detection component 46, ensuring the stability of the magnetic detection component 46, and also ensuring the accuracy of the detection result of the steel rope core detection device 17.

[0031] In order to further improve the stability of the detection result of the steel rope core detection device 17, a through hole for the hanging rod 42 to pass through is provided on the cross bar 43, and two positioning nuts are threadedly connected to the hanging rod 42. The two positioning nuts are respectively clamped on both sides of the cross bar 43 to clamp the cross bar 43. On this basis, the positioning nuts can be moved on the hanging rod 42 by rotating the positioning nuts, so as to change the height of the cross bar 43, and then change the height of the magnetic detection component 46, and finally change the distance between the magnetic detection component 46 and the lower half part 7 of the conveyor belt, ensuring that the first magnetic detection component 46 can magnetize the rope core smoothly and the second magnetic detection component 46 can detect the magnetic field generated after the rope core is magnetized smoothly.

[0032] As Figure 4 shown, the specific structure of the extrusion and stretching component 15 is as follows: The extrusion and stretching component 15 includes a substrate 27 fixedly arranged on the frame of the conveyor belt, and the substrate 27 is parallel to the lower half part 7. At least one screw hole 40 is provided on the substrate 27, and a screw rod 32 is arranged in the screw hole 40 in a matching manner. The lower end of the screw rod 32 is rotatably connected with a pressing rod 35 extending downward, and the lower end of the pressing rod 35 is rotatably connected with an extrusion wheel 36. The axis of the extrusion wheel 36 is parallel to the width direction of the conveyor belt. During the rotation of the screw rod 32, it can move downward and push the pressing rod 35 and the extrusion wheel 36 to move synchronously until the extrusion wheel 36 contacts the lower half part 7 and extrudes the lower half part 7 to form an unfolded part 16. Before the conveyor belt starts to run, first adjust the extrusion and stretching component 15. Specifically, rotate the screw rod 32 to make it move axially. During the movement of the screw rod 32, it can push the pressing rod 35 to move downward synchronously, and then drive the extrusion wheel 36 to move downward by the pressing rod 35 until the extrusion wheel 36 extrudes the lower half part 7 of the conveyor belt to form a downwardly bulging unfolded part 16 on the lower half part 7. The lower the height of the extrusion wheel 36, the greater the bulging amplitude of the unfolded part 16 and the greater the widening amplitude of the crack. However, this will also generate greater resistance to the conveyor belt. According to actual needs, the extrusion wheel 36 can be adjusted to an appropriate height to ensure that the crack can be unfolded while avoiding excessive obstruction of the conveyor belt operation. In addition, by extruding the lower half part 7 with the extrusion wheel 36 and the axis of the extrusion wheel 36 being parallel to the width direction of the conveyor belt, the conveyor belt will drive the extrusion wheel 36 to rotate, that is, only rolling friction will occur between the extrusion wheel 36 and the lower half part 7, which can reduce the resistance generated to the conveyor belt.

[0033] The specific setting manner of the substrate 27 is as follows: The substrate 27 is fixedly connected to the cross beam 1 through a plurality of second mounting plates 26, and the substrate 27 is located above the cross beam 1.

[0034] In order to ensure that the pressure rod 35 can apply pressure to the lower half 7 in a direction perpendicular to the lower half 7, and to prevent the pressure rod 35 from deflecting and causing the extrusion wheel 36 to twist, thereby causing excessive resistance to the conveyor belt, at least one set of guide rods 28 corresponding to the pressure rod 35 is fixedly connected to the substrate 27. The number of each set of guide rods 28 is set to two. Second chutes 29 extending vertically are formed in the guide rods 28, and the two second chutes 29 are arranged oppositely. A follower rod 30 is fixedly connected to the pressure rod 35, and the two ends of the follower rod 30 respectively extend into the two second chutes 29. Through the cooperation of the second chutes 29 and the follower rod 30, the moving direction of the pressure rod 35 can be restricted, ensuring that the pressure rod 35 can only move downward in a direction perpendicular to the lower half 7.

[0035] Furthermore, the connection manner between the pressure rod 35 and the screw rod 32 is as follows: A receiving box 34 is fixedly connected to the upper end of the pressure rod 35. A through hole for the screw rod 32 to pass through is formed in the top of the receiving box 34. After the lower end of the screw rod 32 passes through the through hole and enters the interior of the receiving box 34, a rotating disk 33 is coaxially fixedly connected, and the diameter of the rotating disk 33 is larger than the diameter of the screw rod 32. During the rotation of the screw rod 32, the rotating disk 33 can rotate in the receiving box 34 without driving the pressure rod 35 to rotate synchronously, thereby realizing the rotational connection between the screw rod 32 and the pressure rod 35, and further ensuring that the screw rod 32 can smoothly push the pressure rod 35 downward during rotation. As Figure 5 shown, in order to facilitate the rotation of the screw rod 32, an operation block 31 can be fixedly connected to the upper end of the screw rod 32. The operation block 31 can be prism-shaped and is coaxially fixedly connected to the screw rod 32. For example, the operation block 31 can be hexagonal prism-shaped.

[0036] Further, the squeezing and stretching assembly 15 includes at least one set of auxiliary lifting assemblies, with two in each set. The auxiliary lifting assembly includes a support plate 38 fixedly connected to the frame of the conveyor belt. The support plate 38 is used to support the lower half 7 of the conveyor belt. Since the lower half 7 of the conveyor belt is relatively slack during actual use, the part between the two lower rollers 6 may sag, and the squeezing wheel 36 may not be able to smoothly squeeze these parts downward. Therefore, the present invention also provides an auxiliary lifting assembly in the squeezing and stretching assembly 15. The support plate 38 in the auxiliary lifting assembly is used to assist in supporting the lower half 7, and the squeezing wheel 36 squeezes the part of the lower half 7 between the two support plates 38 to ensure that the unfolding part 16 can be smoothly formed. The support plate 38 can be fixedly connected to the cross beam 1 of the frame through an extension rod 37 and is located below the cross beam 1. Two downwardly curved arc plates 39 can be connected to both ends of the support plate 38 respectively. When the lower half 7 of the conveyor belt is squeezed to form the unfolding part 16, it can contact the arc plates 39, which can prevent the edge of the support plate 38 from scratching the conveyor belt for a long time and causing damage to the conveyor belt.

[0037] As Figure 2 shown, in order to improve the clarity of the detection image and thus ensure that cracks on the conveyor belt can be smoothly detected, the tear detection mechanism includes a lighting assembly 12 for illuminating the unfolding part 16, and the lighting assembly 12 is located on the side of the camera 14 facing away from the unfolding part 16.

[0038] As Figure 3 shown, the specific structure of the lighting assembly 12 is as follows: The lighting assembly 12 includes a first mounting rod 18 fixedly arranged on the frame of the conveyor belt, and the first mounting rod 18 extends vertically. A first sliding groove 19 extending along the length direction is formed on the first mounting rod 18. A sliding block 20 is slidably arranged in the first sliding groove 19. A part of the sliding block 20 extends out of the first sliding groove 19 and is fixedly connected to a connecting plate 21. The connecting plate 21 is fixedly connected to a first mounting plate 22. A light box 24 for emitting light is fixedly arranged on the first mounting plate 22, and the light box 24 faces the unfolding part 16. During use, the light box 24 emits light towards the unfolding part 16 to illuminate the unfolding part 16, and then the camera 14 can be used to take a detection image of the unfolding part 16. After the unfolding part 16 is illuminated, the detection image is clearer. On the other hand, by adjusting the position of the sliding block 20 in the first sliding groove 19, the height of the connecting plate 21 and the first mounting plate 22 can be changed, and thus the height of the light box 24 can be changed to ensure that the light box 24 can smoothly illuminate the unfolding part 16. Further, a plurality of fastening bolts 23 are inserted through the first mounting plate 22. By rotating the fastening bolts 23, the fastening bolts 23 can be tightened against the first mounting rod 18 to fix the position of the first mounting plate 22.

[0039] The light box 24 may include a box body, a light source is arranged inside the box body, the light source may be set as an LED light source, an opening is also arranged on the box body, and a light homogenizing plate 25 is fixedly arranged in the opening, and the light homogenizing plate 25 faces the unfolding part 16. The light homogenizing plate 25 can make the light emitted by the light source irradiate the unfolding part 16 more evenly, avoiding local glare, resulting in a large number of light spots in the detected image and making it impossible to smoothly identify whether there are cracks on the conveyor belt.

[0040] The camera 14 is arranged in the following way: the tearing detection mechanism includes a bottom plate 11 fixedly arranged on the frame of the conveyor belt, a telescopic rod 13 is vertically fixedly arranged on the bottom plate 11, and the camera 14 is rotatably arranged on the top of the telescopic rod 13. The height of the camera 14 can be adjusted through the telescopic rod 13, and then the camera 14 is rotatably arranged on the top of the telescopic rod 13 by using structures such as hinges, so that the direction of the camera 14 can also be adjusted to ensure that the camera 14 can smoothly take pictures of the unfolding part 16.

[0041] The present invention also provides a method for on-line safety monitoring of a coal mine conveyor belt, based on the above-mentioned on-line safety monitoring system for a coal mine conveyor belt, and the method includes S1 to S5.

[0042] S1. Use the steel cord core detection device 17 to detect the cord core inside the conveyor belt to obtain cord core health data.

[0043] S2. Use the extrusion and stretching assembly 15 in the tearing detection mechanism to squeeze the lower half 7 of the conveyor belt downward, so that the lower half 7 forms an unfolding part 16 that bulges downward.

[0044] S3. Use the camera 14 in the tearing detection mechanism to take pictures of the unfolding part 16 to obtain a detected image.

[0045] S4. Identify the detected image to obtain belt health data and damage position data. The obtained belt health data mainly includes whether there are cracks and the crack width, etc., and the existing image recognition methods can be used to identify the detected image, such as the belt crack detection method based on image recognition disclosed in Chinese patent document CN114002228A.

[0046] S5. Locate the cord core health data and belt health data based on the damage position data. More specifically, the method for identifying the detected image to obtain the damage position data includes S51 to S53.

[0047] S51. Extract at least one marker from the detected image.

[0048] S52. Determine the detection reference point according to the marker.

[0049] S53. Generate damage position data according to the detection reference point and the running speed of the conveyor belt.

[0050] More specifically, since the cracks in the conveyor belt usually do not expand rapidly and the conveyor belt is constantly running, after a crack is detected, the same crack can be detected repeatedly multiple times, and this crack can be used as a marker. Furthermore, the conveyor belt can be simplified to a circle, the marker is used as a point on the circle and marked as the detection base point, and combined with the speed of the conveyor belt, the positions of other cracks detected subsequently can be calculated, so as to obtain the damage position data corresponding to the belt health data.

[0051] Furthermore, since the distance between any tear detection structure and the steel cord core detection device 17 is fixed, and the distance between any deployment part 16 and the steel cord core detection device 17 is also fixed. Therefore, the position of the core damage detected by the steel cord core detection device 17 can also be determined by using the detection base point. Specifically, the detection base point is marked as point O. When the detection base point is detected again, the position of the steel cord core detection device 17 is determined based on the distance between the deployment part 16 and the steel cord core detection device 17, denoted as point P, and the current time t0 is determined. After that, when the steel cord core detection device 17 detects core damage, the time t1 is determined, and then according to the running speed v of the conveyor belt and the time difference tx between time t1 and time t0, the distance between the core damage position Px and point P can be calculated, and further the distance between the core damage position Px and point O can be obtained.

[0052] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An on-line safety monitoring system for a coal mine conveyor belt, characterized in that, It includes a steel cord core detection device (17) and multiple tearing detection devices; The steel cord core detection device (17) includes two magnetic detection components (46). During the operation of the conveyor belt, the lower half (7) of the conveyor belt passes by the sides of the two magnetic detection components (46) in sequence. The first magnetic detection component (46) is used to generate a magnetic field to magnetize the cord core of the conveyor belt, and the second magnetic detection component (46) is used to detect the magnetized cord core; The tearing detection device includes multiple tearing detection mechanisms. After the lower half (7) of the conveyor belt passes through the steel cord core detection device (17), it passes by the sides of all the tearing detection mechanisms in sequence. The tearing detection mechanism includes a squeezing and stretching component (15) arranged between the upper half (4) and the lower half (7) of the conveyor belt and a camera (14) arranged below the lower half (7). Among them, the squeezing and stretching component (15) is used to squeeze the lower half (7) downward to form at least one downwardly bulging unfolding part (16), and the camera (14) is used to photograph the unfolding part (16). In the width direction of the conveyor belt, the positions of the unfolding parts (16) formed by different squeezing and stretching components (15) squeezing the lower half (7) are different.

2. The on-line safety monitoring system for a coal mine conveyor belt according to claim 1, characterized in that The steel cord core detection device (17) includes two connecting bars (41) fixedly arranged on the frame of the conveyor belt, and the connecting bars (41) extend along the width direction of the conveyor belt. A downwardly extending hanging rod (42) is fixedly connected to each end of the connecting bar (41). The hanging rods (42) connected by the two connecting bars (41) correspond one by one and are jointly fixedly connected with a cross bar (43). The cross bar (43) extends along the conveying direction of the conveyor belt. Two mounting grooves (44) extending along the width direction of the conveyor belt are fixedly connected between the two cross bars (43). The magnetic detection component (46) is fixedly arranged on the mounting groove (44), and a wire passing space (45) for the power supply wire and signal wire of the magnetic detection component (46) to pass through is formed inside the mounting groove (44).

3. The on-line safety monitoring system for a coal mine conveyor belt according to claim 1, characterized in that The squeezing and stretching component (15) includes a substrate (27) fixedly arranged on the frame of the conveyor belt, and the substrate (27) is parallel to the lower half (7). At least one screw hole (40) is opened on the substrate (27), and a screw (32) is arranged in the screw hole (40) in a matching manner. The lower end of the screw (32) is rotatably connected with a downwardly extending pressing rod (35), and the lower end of the pressing rod (35) is rotatably connected with a squeezing wheel (36). And the axis of the squeezing wheel (36) is parallel to the width direction of the conveyor belt. During the rotation of the screw (32), it can move downward and push the pressing rod (35) and the squeezing wheel (36) to move synchronously until the squeezing wheel (36) contacts the lower half (7) and squeezes the lower half (7) to form the unfolding part (16).

4. The on-line safety monitoring system for a coal mine conveyor belt according to claim 3, characterized in that, The substrate (27) is fixedly connected with at least one group of guide rods (28) corresponding to the pressure rods (35). The number of each group of guide rods (28) is set to two. A second chute (29) extending vertically is formed on the guide rod (28), and the two second chutes (29) are arranged oppositely. The pressure rod (35) is fixedly connected with a follower rod (30), and the two ends of the follower rod (30) respectively extend into the two second chutes (29).

5. The on-line safety monitoring system for coal mine conveyor belts according to claim 1, characterized in that, The extrusion and stretching assembly (15) includes at least one group of auxiliary lifting assemblies. The number of each group of auxiliary lifting assemblies is two. The auxiliary lifting assembly includes a support plate (38) fixedly connected with the frame of the conveyor belt, and the support plate (38) is used for supporting the lower half (7) of the conveyor belt.

6. The on-line safety monitoring system for a coal mine conveyor belt according to claim 1, characterized in that, The tearing detection mechanism includes a lighting assembly (12) for illuminating the unfolding part (16), and the lighting assembly (12) is located on the side of the camera (14) facing away from the unfolding part (16).

7. The on-line safety monitoring system for a coal mine conveyor belt according to claim 6, characterized in that The lighting assembly (12) includes a first mounting rod (18) fixedly arranged on the frame of the conveyor belt, and the first mounting rod (18) extends vertically. A first chute (19) extending along the length direction is formed on the first mounting rod (18). A sliding block (20) is slidably arranged in the first chute (19). A part of the sliding block (20) extends out of the first chute (19) and is fixedly connected with a connecting plate (21). The connecting plate (21) is fixedly connected with a first mounting plate (22). A light box (24) for emitting light is fixedly arranged on the first mounting plate (22), and the light box (24) faces the unfolding part (16).

8. An on-line safety monitoring system for a coal mine conveyor belt according to claim 1, characterized in that, The tearing detection mechanism includes a bottom plate (11) fixedly arranged on the frame of the conveyor belt. A telescopic rod (13) is vertically and fixedly arranged on the bottom plate (11), and the camera (14) is rotatably arranged at the top of the telescopic rod (13).

9. An on-line safety monitoring method for a conveyor belt used in a coal mine, characterized in that, Based on a coal mine conveyor belt online safety monitoring system according to any one of claims 1-8, the method includes the following steps: Using the steel cord core detection device (17) to detect the cord core inside the conveyor belt to obtain cord core health data; Using the extrusion and stretching assembly (15) in the tearing detection mechanism to squeeze the lower half (7) of the conveyor belt downward to form an unfolding part (16) bulging downward; Using the camera (14) in the tearing detection mechanism to photograph the unfolding part (16) to obtain a detection image; Identifying the detection image to obtain belt health data and damage position data; Positioning the cord core health data and the belt health data based on the damage position data.

10. The on-line safety monitoring method for a coal mine conveyor belt according to claim 9, characterized in that, The method for identifying the detection image to obtain the damage position data includes: Extracting at least one marker from the detection image; Determining a detection reference point according to the marker; Generating damage position data according to the detection reference point and the running speed of the conveyor belt.

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