A detection method for a large belt conveyor

Abstract

The present invention provides a full-optical detection method for large belt conveyor rollers, offset, and pull-wire switches, which solves the problems such as the susceptibility of belt roller detection to interference. The method includes the following steps: S1: Arrange a temperature overrun detection mechanism and an offset detection mechanism at the junction of the belt and the roller; S2: When the temperature overrun detection mechanism detects that the temperature exceeds the threshold value, or when the offset detection mechanism senses that the offset amount of the belt relative to the roller exceeds a predetermined value, the safety detection component receives the mechanical displacement signal sent by the temperature overrun detection mechanism or the offset detection mechanism, and sends an optical signal to the superior management department; S3: The inspection personnel manually pull the pull-wire switch equipped with the safety detection component, and the driving mechanisms of the belt and the roller stop accordingly. The present invention has the advantages of strong anti-interference ability and high response sensitivity.

Description

Technical Field

[0001] The present invention belongs to the technical field of transmission detection, and particularly relates to a detection method for a large belt conveyor. Background Art

[0002] A large belt conveyor uses rollers to support the belt, and the rollers rotate when the belt moves. When the rollers are blocked or have large friction, the temperature is likely to rise sharply, leading to danger, and there is currently no general solution. When the temperature of the rollers exceeds the limit, an alarm signal needs to be sent in time to remind the inspection personnel to shut down in time. In addition, when the belt moves and deviates, it needs to be detected and corrected in time. When a fault is found during personnel inspection, the safety pull rope switch needs to be pulled immediately to stop the belt conveyor. The belt deviation detection and the safety pull rope switch use travel switches to detect and transmit electrical signals. Large belt conveyors are generally in the wild, and a large number of electrical and electronic devices are used, making them vulnerable to lightning threats.

[0003] In order to solve the deficiencies of the existing technology, people have conducted long-term explorations and proposed various solutions. For example, a Chinese patent document discloses a belt deviation detection method [202210608428.9], which includes selecting a belt edge detection frame from a captured video; performing edge detection on the belt edge detection frame to obtain edge points; performing line detection based on the edge points to obtain the belt edge line; drawing the initial position of the belt edge and the left and right boundaries of the deviation; judging whether the belt edge line deviates based on the initial position of the belt edge and the left and right boundaries of the deviation to obtain a judgment result; and performing belt deviation alarm based on the judgment result.

[0004] The above solution solves the problem of belt deviation detection to a certain extent, but there are still many deficiencies in this solution, such as the large-scale use of electrical and electronic detection equipment and vulnerability to electromagnetic interference. Summary of the Invention

[0005] The purpose of the present invention is to provide a detection method for a large belt conveyor with reasonable design and effective reduction of electromagnetic interference in view of the above problems.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions: A detection method for a large belt conveyor includes the following steps:

[0007] S1: Arrange a temperature over-limit detection mechanism and a deviation detection mechanism at the junction of the belt and the rollers.

[0008] S2: When the temperature over-limit detection mechanism detects that the temperature exceeds the threshold, or when the deviation detection mechanism senses that the relative deviation amount of the belt with respect to the rollers exceeds a predetermined value, the safety detection component receives the mechanical displacement signal sent by the temperature over-limit detection mechanism or the deviation detection mechanism, and sends an optical signal to the superior management department.

[0009] S3: The inspection personnel manually pull the pull cord switch equipped with the safety detection component, and the driving mechanisms of the belt and the roller stop accordingly. The temperature overrun detection mechanism and the offset detection mechanism send mechanical displacement signals to the safety detection component and upload the alarm signals in a timely manner through optical fibers. The optical signals will not be affected by electromagnetic interference, effectively improving the operation detection stability of the belt conveyor.

[0010] In the above-mentioned large belt conveyor detection method, the temperature overrun detection mechanism includes a temperature detector. A heat conduction component is installed in the temperature detector, and the heat conduction component is equipped with a thermal deformation component. The thermal deformation component is connected to the safety detection component through a thermal deformation amplification component. The temperature overrun detection mechanism uses the thermal deformation of metal to sense the temperature changes of the roller and the belt, and has stronger anti-interference ability compared with infrared induction.

[0011] In the above-mentioned large belt conveyor detection method, the temperature detector includes a detection strip plate adjacent to the roller. The detection strip plate is located between the parallel belts and has a strip-shaped opening for the heat conduction component to extend out. An insulating cavity is left in the detection strip plate. The detection strip plate has a detection protrusion opposite to the junction of the roller and the belt. The cross-section of the detection protrusion is sharp-cornered. The strip-shaped openings are arranged on both sides of the detection protrusion. Fixing components connected to the belt conveyor are provided at both ends of the detection strip plate. The temperature detector is installed at the junction of the roller and the belt to ensure the best heat exchange effect of the heat conduction component.

[0012] In the above-mentioned large belt conveyor detection method, the fixing component includes a fixing bolt arranged at the end of the detection strip plate. A fixing disk and a fixing knob for clamping and fixing the belt conveyor are threadedly connected to the fixing bolt. A gasket is arranged on the side of the fixing disk opposite to the belt conveyor, and a fixing hole for the fixing bolt to pass through is opened on the belt conveyor. The fixing component can adjust the orientation angle of the temperature detector and install the temperature detector at different positions according to needs.

[0013] In the above-mentioned large belt conveyor detection method, the heat conduction component includes a heat conduction substrate installed in the temperature detector. Heat conduction fins opposite to the belt or the roller are arranged at equal intervals on the heat conduction substrate. An insulating cover plate is arranged on the side of the heat conduction fin away from the included angle between the belt and the roller. A gap of 0.8 - 1.4 mm is left between the insulating cover plate, the heat conduction fins and the belt and the roller. The gap between adjacent heat conduction fins is 4 - 6 mm. The heat conduction component uses the heat conduction fins and the heat conduction substrate to achieve heat exchange, and at the same time retains a gap with the belt and the roller to avoid direct contact affecting normal transmission.

[0014] In the above-mentioned large belt conveyor detection method, the thermal deformation component includes an independent deformation component and a combined deformation component; the independent deformation component includes a pair of independent thermal deformation sheets that are attached to the same heat-conducting substrate and have different coefficients of thermal expansion. The independent thermal deformation sheets are attached to each other and have the same deformation bending direction; the combined deformation component includes a pair of combined thermal deformation sheets that are attached to different heat-conducting substrates and have different coefficients of thermal expansion. The combined thermal deformation sheets remain separated and have opposite deformation bending directions; the thermal deformation amplification component includes a first amplification rod rotatably installed in the temperature detector. One end of the first amplification rod is hinged or abutted against the independent thermal deformation sheet, and a first induction contact is fixed at the other end. The distance from the first induction contact to the fulcrum of the first amplification rod is greater than the distance from the independent thermal deformation sheet to the fulcrum of the first amplification rod; the thermal deformation amplification component further includes a second amplification rod that is rotatably installed in the temperature detector and is arranged crosswise. One end of the second amplification rod is hinged or abutted against the combined thermal deformation sheet, and a second induction contact is fixed at the other end. The distance from the second induction contact to the fulcrum of the second amplification rod is greater than the distance from the combined thermal deformation sheet to the fulcrum of the second amplification rod. Select a suitable thermal deformation component according to actual needs, and use the thermal deformation amplification component to improve the induction accuracy.

[0015] In the above-mentioned large belt conveyor detection method, the offset detection mechanism includes an offset detection plate arranged outside the temperature detector. The offset detection plate is axially arranged with induction components opposite to the inner side of the belt, and a heat insulation component is arranged between the induction components and the heat conduction component. The offset detection mechanism monitors the relative position of the belt to the roller and sends an offset signal in time when an offset occurs.

[0016] In the above-mentioned large belt conveyor detection method, a detection groove extending axially is opened on the offset detection plate. The induction components are installed in the detection groove. Both ends of the offset detection plate are rotatably connected to the temperature detector through swing rods. Stabilizing rods are rotatably connected to both ends of the offset detection plate, and the other ends of the stabilizing rods are slidably connected to the belt conveyor. The relative position of the offset detection plate to the temperature detector is adjustable to monitor the relationship between belt offset and temperature change in time.

[0017] In the above-mentioned large belt conveyor detection method, the induction component includes a conductive slide rod arranged in the detection groove. An induction slider is slidably installed on the conductive slide rod. An induction roller is rotatably installed on the induction slider, and a limiting groove for the induction roller to be inserted into is arranged on the inner side of the belt. The conductive slide rod and the induction slider are electrically connected to each other through induction brushes and are connected with a wiring terminal; the heat insulation component includes heat dissipation rib plates distributed at the lower end of the offset detection plate, and a heat insulation layer opposite to the heat conduction component is arranged at the upper end of the offset detection plate. The induction component converts the mechanical signal of belt offset into an electrical signal and transmits it into the safety detection component.

[0018] In the above-mentioned large belt conveyor detection method, the safety detection component includes a PLC control module. The PLC control module is connected to an optical fiber through an optoelectronic conversion module, and a pull cord switch is connected to the PLC control module. The safety detection component converts an electrical signal into an optical signal to avoid electromagnetic interference.

[0019] Compared with the existing technology, the advantages of the present invention are as follows: mechanical displacement detection is adopted instead of electronic detection, which improves the detection stability of the belt and the roller, and avoids the influence of electromagnetic interference on the detection effect; optical fiber is used for signal transmission, which has good stability during long-distance transmission; the combination of the temperature over-limit detection mechanism and the offset detection mechanism facilitates comparing the relative relationship between the belt offset and the temperature change, thereby improving the detection accuracy of the belt roller. Description of the Drawings

[0020] Figure 1 is the structural schematic diagram of the present invention;

[0021] Figure 2 is the structural schematic diagram of another perspective of the present invention;

[0022] Figure 3 is the assembly schematic diagram of the present invention;

[0023] Figure 4 is the partial cross-sectional view of the present invention;

[0024] Figure 5 is another partial cross-sectional view of the present invention;

[0025] Figure 6 is the control schematic diagram of the present invention;

[0026] In the figure, the temperature over-limit detection mechanism 1, the temperature detector 11, the detection strip plate 12, the strip-shaped opening 13, the heat insulation cavity 14, the detection protrusion 15, the fixing bolt 16, the fixing disk 17, the fixing knob 18, the gasket 19, the offset detection mechanism 2, the offset detection plate 21, the detection groove 22, the swing rod 23, the stabilizing rod 24, the safety detection component 3, the PLC control module 31, the optoelectronic conversion module 32, the heat conduction component 4, the heat conduction substrate 41, the heat conduction sheet 42, the heat insulation cover plate 43, the thermal deformation component 5, the independent deformation component 51, the independent thermal deformation sheet 52, the combined deformation component 53, the combined thermal deformation sheet 54, the thermal deformation amplification component 6, the first amplification rod 61, the first induction contact 62, the second amplification rod 63, the second induction contact 64, the induction component 7, the conductive sliding rod 71, the induction slider 72, the induction roller 73, the wiring terminal 74, the heat dissipation rib plate 75, the heat insulation layer 76, and the pull cord switch 8. Detailed Embodiments

[0027] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0028] As Figure 1-2 shown, a large belt conveyor detection method includes the following steps:

[0029] S1: After the belt and the roller are tightened, a temperature overrun detection mechanism 1 and an offset detection mechanism 2 are arranged at the junction of the belt and the roller to ensure that the temperature overrun detection mechanism 1 and the offset detection mechanism 2 have sufficient detection areas with the belt or the roller;

[0030] S2: When the roller is blocked or the friction is too large, the temperature overrun detection mechanism 1 detects that the temperature exceeds the threshold, or when the offset detection mechanism 2 senses that the relative offset of the belt with respect to the roller exceeds a predetermined value, the safety detection component 3 receives the mechanical displacement signal sent by the temperature overrun detection mechanism 1 or the offset detection mechanism 2. The safety detection component 3 converts the electrical signal into an optical signal and sends the optical signal to the superior management department for warning. At the same time, the safety detection component 3 can usually automatically shut down the driving mechanisms of the belt and the roller.

[0031] S3: The inspection personnel manually pull the pull cord switch 8 equipped with the safety detection component 3, and the driving mechanisms of the belt and the roller stop accordingly. The pull cord switch 8 is a travel switch, and part of the electrical signal sent is transmitted into the safety detection component 3.

[0032] The belt and the roller are driven by friction with each other, resulting in local heating at their junction. Conventional temperature detection devices use infrared detection methods, but they are prone to malfunction in a complex electromagnetic environment. If the inspection personnel do not shut down in time, it will cause damage to the belt conveyor. In addition, when the belt is offset relative to the roller, it will affect the belt transmission direction. At the same time, due to the misalignment, the pressing force distribution between the belt and the roller is uneven, exacerbating its local heating. Therefore, it is necessary to combine the temperature overrun detection mechanism 1 and the offset detection mechanism 2 to monitor the relative relationship between the offset amount and the temperature change.

[0033] Specifically, conventional temperature sensors are usually arranged outside the belt conveyor and opposite to the outer surface of the belt. However, when the belt and the roller are heated by friction, most of the heat accumulates inside the belt. The belt expands due to heat, further increasing its frictional torque and causing it to break. The temperature overrun detection mechanism 1 includes a temperature detector 11 arranged inside the belt, and there is also a cavity for installing the temperature detector 11 inside the belt. A heat conduction component 4 is installed inside the temperature detector 11 for heat conduction, and at the same time, a certain distance is maintained between the temperature detector 11 body and the belt and the roller. The heat conduction component 4 is equipped with a thermal deformation component 5, and the thermal deformation component 5 deforms as the temperature rises. The thermal deformation component 5 amplifies the deformation amount through a thermal deformation amplification component 6. The thermal deformation component 5 is connected to the safety detection component 3 and converts the mechanical signal into an electrical signal.

[0034] As Figure 3As shown in the figure, the temperature detector 11 includes a detection strip plate 12 adjacent to the roll. The detection strip plate 12 is usually in a square strip shape for convenient positioning and assembly with the belt conveyor. The detection strip plate 12 is located between parallel belts and has a strip-shaped opening 13 for the heat conduction component 4 to extend out. The strip-shaped opening 13 faces the belt and the roll respectively. An insulating cavity 14 is left in the detection strip plate 12 and is opposite to the strip-shaped opening 13. When the heat conduction component 4 is installed, the strip-shaped opening 13 is blocked. The detection strip plate 12 has a detection protrusion 15 opposite to the junction of the roll and the belt. The cross-section of the detection protrusion 15 is in a sharp angle shape. The strip-shaped opening 13 is arranged on both sides of the detection protrusion 15. Fixing components for connecting with the belt conveyor are provided at both ends of the detection strip plate 12. Multiple groups of temperature detectors 11 can be installed on the same belt conveyor to independently or jointly detect the roll or the belt.

[0035] Furthermore, the temperature detector 11 keeps its center line axis parallel to the center axis of the roll through the fixing components, and at the same time, the fixing components can be disassembled and installed at different positions of the belt conveyor at any time. The fixing components include fixing bolts 16 arranged at the ends of the detection strip plate 12. A fixing disk 17 and a fixing knob 18 for clamping and fixing with the belt conveyor are threadedly connected to the fixing bolts 16. A gasket 19 is arranged on the side of the fixing disk 17 opposite to the belt conveyor, and fixing holes for the fixing bolts 16 to pass through are provided on the belt conveyor. By selecting a rubber material for the gasket 19, the contact friction with the belt conveyor is increased, and the circumferential deflection of the temperature detector 11 relative to the center axis of the fixing bolt is avoided.

[0036] As Figure 1-2 shown in the figure, the heat conduction component 4 includes a heat conduction substrate 41 installed in the temperature detector 11. The heat conduction substrate 41 is usually made of brass to obtain good heat conduction performance, and its specifications are consistent with those of the strip-shaped opening 13. Heat conduction fins 42 opposite to the belt or the roll are arranged equidistantly on the heat conduction substrate 41. The heat conduction substrate 41 and the heat conduction fins 42 are usually integrally formed. An insulating cover plate 43 is arranged on the side of the heat conduction fin 42 away from the included angle between the belt and the roll to ensure the heat accumulation effect and ensure that the heat is evenly and fully conducted to the heat conduction substrate 41. A gap of 0.8 - 1.4 mm is left between the insulating cover plate 43 and the heat conduction fins 42 and the belt and the roll, and the gap between adjacent heat conduction fins 42 is 4 - 6 mm. When the belt heats up, collisions will occur, and a certain gap is left with the heat conduction fins 42 as a buffer margin to prevent the heat conduction fins 42 from directly contacting the inner side of the belt and causing scratches on the belt.

[0037] From Figure 4-5As can be seen, the thermal deformation assembly 5 includes an independent deformation assembly 51 and a combined deformation assembly 53. The independent deformation assembly 51 is suitable for individually detecting a belt or a roller, while the combined deformation assembly 53 has stronger thermal sensitivity than the independent deformation assembly 51 and has a higher response sensitivity when the temperature exceeds the threshold value. The independent deformation assembly 51 includes a pair of independent thermal deformation sheets 52 that are attached to the same heat-conducting substrate 41 and have different coefficients of thermal expansion. The independent thermal deformation sheets 52 are attached to each other and have the same deformation bending direction. Due to the different coefficients of thermal expansion of the heat-conducting substrate 41, the difference in their extension amounts causes the entire heat-conducting substrate 41 to bend toward one side. The combined deformation assembly 53 includes a pair of combined thermal deformation sheets 54 that are attached to different heat-conducting substrates 41 and have different coefficients of thermal expansion. The combined thermal deformation sheets 54 remain separated and have opposite deformation bending directions. Similar to the independent deformation assembly 51, the combined thermal deformation sheets 54 in the combined deformation assembly 53 move closer to or away from each other when heated.

[0038] Specifically, the thermal deformation amplification assembly 6 includes a first amplification rod 61 rotatably installed in the temperature detector 11. One end of the first amplification rod 61 is hinged or abutted against the independent thermal deformation sheet 52, and a first induction contact 62 is fixed to the other end. The distance from the first induction contact 62 to the fulcrum of the first amplification rod 61 is greater than the distance from the independent thermal deformation sheet 52 to the fulcrum of the first amplification rod 61. The thermal deformation amplification assembly 6 further includes a second amplification rod 63 rotatably installed in the temperature detector 11 and arranged crosswise. One end of the second amplification rod 63 is hinged or abutted against the combined thermal deformation sheet 54, and a second induction contact 64 is fixed to the other end. The distance from the second induction contact 64 to the fulcrum of the second amplification rod 63 is greater than the distance from the combined thermal deformation sheet 54 to the fulcrum of the second amplification rod 63. The first induction contact 62 and the second induction contact 64 are respectively connected to the safety detection assembly 3 through wires. The first amplification rod 61 and the second amplification rod 63 achieve the on-off of the induction contacts during rotation, and transmit alarm information through the change in the electrical level.

[0039] At the same time, different from the method of detecting the belt offset amount by infrared sensing, the offset detection mechanism 2 in the present application includes an offset detection plate 21 arranged outside the temperature detector 11. The offset detection plate 21 is axially arranged with induction components 7 opposite to the inner side of the belt. An insulation component is arranged between the induction components 7 and the heat-conducting component 4. The induction components 7 are in direct driving contact with the belt, effectively providing the detection accuracy, and the equipped insulation component reduces the influence of temperature change on the induction components 7.

[0040] Such as Figure 1As shown in the figure, a detection groove 22 extending axially is formed in the offset detection plate 21, and the induction assembly 7 is installed in the detection groove 22 and can move axially along the detection groove 22. Both ends of the offset detection plate 21 are rotatably connected to the temperature detector 11 through swing rods 23, so that the over-limit detection mechanism 1 and the offset detection mechanism 2 are paired and combined. Both ends of the offset detection plate 21 are rotatably connected with stabilizing rods 24, and the other ends of the stabilizing rods 24 are slidably connected to the belt conveyor. When the stabilizing rods 24 slide relative to the belt conveyor, the position of the offset detection plate 21 is adjusted accordingly, and the locking of the offset detection plate 21 is achieved by adjusting the included angle between the stabilizing rods 24 and the swing rods 23.

[0041] Obviously, the detection groove 22 can be filled with insulating colloid to improve the detection stability and avoid external interference. The induction assembly 7 includes a conductive sliding rod 71 arranged in the detection groove 22. An induction slider 72 is slidably installed on the conductive sliding rod 71. An induction roller 73 is rotatably installed on the induction slider 72, and a limiting groove for the induction roller 73 to be inserted into is arranged on the inner side of the belt. The conductive sliding rod 71 and the induction slider 72 are electrically connected to each other through induction brushes and are connected with a wiring terminal 74. When the belt deviates relative to the roller, the inner limiting groove deviates accordingly, and the induction roller 73 and the induction slider 72 slide synchronously, thereby adjusting the resistance between the induction sliders 72. By detecting the current change of the circuits connected to different wiring terminals 74, the deviation amount of the belt is judged. During the whole process, the induction roller 73 is always in contact with the limiting groove for transmission. The heat insulation assembly includes heat dissipation rib plates 75 distributed at the lower end of the offset detection plate 21, and a heat insulation layer 76 opposite to the heat conduction assembly 4 is arranged at the upper end of the offset detection plate 21. The heat dissipation rib plates 75 timely conduct the heat generated by the conductive sliding rod 71, and the upper heat insulation layer 76 avoids the heat generated from affecting the temperature detection of the temperature over-limit detection mechanism 1.

[0042] As Figure 6 shown, the safety detection assembly 3 includes a PLC control module 31 for the driving mechanisms of the belt and the roller, and the start and stop of the driving mechanisms are controlled by the PLC control module 31. The PLC control module 31 is connected to the optical fiber through an optoelectronic conversion module 32, and converts the electrical signals transmitted by the temperature over-limit detection mechanism 1 and the offset detection mechanism 2 into optical signals. The pull cord switch 8 is connected to the PLC control module 31, and the inspection personnel can manually pull the pull cord switch 8 to stop the belt conveyor.

[0043] In summary, the principle of this embodiment is that the temperature over-limit detection mechanism 1 and the offset detection mechanism 2 detect the temperature change and the belt deviation amount through mechanical displacement. The safety detection assembly 3 converts the mechanical displacement into an electrical signal and then into an optical signal and transmits it through the optical fiber. When the temperature or the belt deviation amount exceeds the predetermined value, the safety detection assembly 3 controls the belt conveyor to stop in time.

[0044] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways to substitute, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0045] Although terms such as temperature overlimit detection mechanism 1, temperature detector 11, detection strip plate 12, strip opening 13, heat insulation cavity 14, detection protrusion 15, fixing bolt 16, fixing plate 17, fixing knob 18, gasket 19, offset detection mechanism 2, offset detection plate 21, detection groove 22, swing rod 23, stabilizing rod 24, safety detection component 3, PLC control module 31, photoelectric conversion module 32, heat conduction component 4, heat conduction substrate 41, heat conduction sheet 42, heat insulation cover plate 43, thermal deformation component 5, independent deformation component 51, independent thermal deformation sheet 52, combined deformation component 53, combined thermal deformation sheet 54, thermal deformation amplification component 6, first amplification rod 61, first induction contact 62, second amplification rod 63, second induction contact 64, induction component 7, conductive slide bar 71, induction slider 72, induction roller 73, terminal block 74, heat dissipation rib plate 75, heat insulation layer 76, pull cord switch 8 are used more frequently herein, the possibility of using other terms is not excluded. Using these terms is only for more convenient description and explanation of the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A detection method for a large belt conveyor, characterized in that, It includes the following steps: S1: Arrange a temperature overrun detection mechanism (1) and an offset detection mechanism (2) at the junction of the belt and the roller; S2: When the temperature overrun detection mechanism (1) detects that the temperature exceeds the threshold value, or when the offset detection mechanism (2) senses that the offset amount of the belt relative to the roller exceeds the predetermined value, the safety detection component (3) receives the mechanical displacement signal sent by the temperature overrun detection mechanism (1) or the offset detection mechanism (2), and sends an optical signal to the superior management department; S3: The inspection personnel manually pull the pull cord switch (8) equipped with the safety detection component (3), and the driving mechanisms of the belt and the roller stop accordingly; The temperature overrun detection mechanism (1) includes a temperature detector (11). The temperature detector (11) is arranged inside the belt. A heat conduction component (4) is installed in the temperature detector (11). The heat conduction component (4) is equipped with a thermal deformation component (5). The thermal deformation component (5) is connected to the safety detection component (3) through a thermal deformation amplification component (6). The temperature detector (11) includes a detection strip plate (12) adjacent to the roller. The detection strip plate (12) is located between parallel belts and is provided with a strip opening (13) for the heat conduction component (4) to extend out. An insulating cavity (14) is left inside the detection strip plate (12). The detection strip plate (12) has a detection protrusion (15) opposite to the junction of the roller and the belt. The cross section of the detection protrusion (15) is in a sharp angle shape. The strip opening (13) is arranged on both sides of the detection protrusion (15). Fixing components connected to the belt conveyor are arranged at both ends of the detection strip plate (12). The thermal deformation component (5) and the thermal deformation amplification component (6) are located inside the insulating cavity (14). The offset detection mechanism (2) includes an offset detection plate (21) arranged outside the temperature detector (11). The offset detection plate (21) is arranged with induction components (7) opposite to the inside of the belt along the axial direction. An insulating component is arranged between the induction components (7) and the heat conduction component (4). A detection groove (22) extending along the axial direction is opened on the offset detection plate (21). The induction components (7) are installed in the detection groove (22). The induction component (7) includes a conductive sliding rod (71) arranged in the detection groove (22). An induction slider (72) is slidably installed on the conductive sliding rod (71). An induction roller (73) is rotatably installed on the induction slider (72), and a limit groove for the induction roller (73) to be inserted into is arranged on the inside of the belt. The conductive sliding rod (71) and the induction slider (72) are conductively connected to each other through induction brushes and are connected with a terminal block (74). The insulating component includes heat dissipation rib plates (75) distributed at the lower end of the offset detection plate (21).

2. The detection method for a large belt conveyor according to claim 1, characterized in that, The described fixing component includes a fixing bolt (16) arranged at the end of the detection strip plate (12). A fixing disk (17) and a fixing knob (18) which are clamped and fixed to the belt conveyor are threadedly connected to the fixing bolt (16). A gasket (19) is arranged on the side of the fixing disk (17) opposite to the belt conveyor, and a fixing hole for the fixing bolt (16) to pass through is formed in the belt conveyor.

3. The detection method for a large belt conveyor according to claim 1, characterized in that, The described heat conduction component (4) includes a heat conduction substrate (41) installed in the temperature detector (11). Heat conduction fins (42) opposite to the belt or the roller are arranged equidistantly on the heat conduction substrate (41). A heat insulation cover plate (43) is arranged on the side of the heat conduction fin (42) away from the included angle between the belt and the roller. A gap of 0.8 - 1.4 mm is left between the heat insulation cover plate (43), the heat conduction fins (42) and the belt and the roller, and the gap between adjacent heat conduction fins (42) is 4 - 6 mm.

4. The detection method for a large belt conveyor according to claim 3, characterized in that, The described thermal deformation component (5) includes an independent deformation component (51) and a combined deformation component (53); the independent deformation component (51) includes a pair of independent thermal deformation sheets (52) which are attached to the same heat conduction substrate (41) and have different expansion coefficients, and the deformation and bending directions of the independent thermal deformation sheets (52) are the same; the combined deformation component (53) includes a pair of combined thermal deformation sheets (54) which are attached to different heat conduction substrates (41) and have different expansion coefficients, and the combined thermal deformation sheets (54) remain separated and the deformation and bending directions are opposite; the thermal deformation amplification component (6) includes a first amplification rod (61) rotatably installed in the temperature detector (11). One end of the first amplification rod (61) is hinged or abutted against the independent thermal deformation sheet (52), and a first induction contact (62) is fixed at the other end. The distance from the first induction contact (62) to the fulcrum of the first amplification rod (61) is greater than the distance from the independent thermal deformation sheet (52) to the fulcrum of the first amplification rod (61); the thermal deformation amplification component (6) also includes a second amplification rod (63) which is rotatably installed in the temperature detector (11) and is arranged crosswise. One end of the second amplification rod (63) is hinged or abutted against the combined thermal deformation sheet (54), and a second induction contact (64) is fixed at the other end. The distance from the second induction contact (64) to the fulcrum of the second amplification rod (63) is greater than the distance from the combined thermal deformation sheet (54) to the fulcrum of the second amplification rod (63).

5. The detection method for a large belt conveyor according to claim 1, characterized in that, Both ends of the described offset detection plate (21) are rotatably connected to the temperature detector (11) through swing rods (23). Stabilizing rods (24) are rotatably connected to both ends of the offset detection plate (21), and the other ends of the stabilizing rods (24) are slidably connected to the belt conveyor.

6. The detection method for a large belt conveyor according to claim 1, characterized in that, The described safety detection component (3) includes a PLC control module (31). The PLC control module (31) is connected to an optical fiber through an optoelectronic conversion module (32), and the pull - rope switch (8) is connected to the PLC control module (31).

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