Coal belt automatic protection device

Abstract

The application discloses a coal belt coal scattering automatic protection device, which comprises a first conveying belt for conveying coal, a second conveying belt arranged below the first conveying belt and used for receiving scattered coal, a cleaning mechanism installed above the second conveying belt and used for scraping off the coal, a collecting container arranged below the cleaning mechanism and used for receiving the scraped-off coal, and a triggering mechanism used for detecting the accumulation amount of the coal in the collecting container and outputting a triggering signal when the accumulation amount reaches a predetermined triggering condition to control the first conveying belt to stop. The coal belt coal scattering automatic protection device utilizes the second conveying belt to convey the scattered coal at any position to a fixed detection point, realizes full-line coverage, automatically detects the accumulation amount in real time through the triggering mechanism, eliminates a time blind area, and is high in environmental adaptability and low in modification cost.

Description

Technical Field

[0001] This application relates to the field of safety protection technology for coal conveying systems, and more specifically, to an automatic protection device for coal spillage on a coal conveyor belt. Background Technology

[0002] In the coal conveying system of thermal power plants, belt conveyors are the core equipment for coal transportation. As a core component of the system, coal conveyor belts are characterized by high value, susceptibility to damage, and difficulty in maintenance. A coal conveyor belt that is 1.4 meters wide and 500 meters long can cost hundreds of thousands of yuan, and the replacement cycle usually takes 3 to 7 days.

[0003] During the operation of coal conveyor belts, coal frequently spills from the edges of the belt due to reasons such as belt misalignment, overload, joint damage, and puncture by sharp foreign objects. If the spilled coal is not detected and handled in time, it can easily get caught between the drum and the belt, causing the belt to tear longitudinally and potentially resulting in complete damage to tens of meters of belt within minutes.

[0004] Currently, the detection and protection against coal spillage on coal conveyor belts mainly rely on manual inspections, fixed coal pile protection devices, or artificial intelligence visual detection systems. Manual inspections are inefficient, with a significant delay between the occurrence and detection of spillage, often resulting in large coal accumulation or even belt damage, creating a serious time blind spot. Fixed coal pile protection devices are typically installed at specific locations in the coal chute or drop pipe, triggering protection by detecting the coal level. However, these devices can only detect coal levels near their installation location and cannot detect spillage occurring outside the drop point due to deviations or other reasons. Because the location of coal spillage on the conveyor belt is highly random, fixed devices have a significant spatial blind spot. Artificial intelligence visual detection systems, on the other hand, suffer from high implementation costs, complex algorithms, low recognition rates in dusty or poorly lit environments, and require substantial computing resources, making them difficult to widely implement in older power plants.

[0005] Therefore, how to achieve automatic detection and full-line coverage of coal spillage on coal conveyor belts has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] The purpose of this application is to disclose an automatic protection device for coal spillage on a coal conveyor belt, so as to realize automatic detection and full coverage of coal spillage on the coal conveyor belt.

[0007] An automatic protection device for coal spillage on a coal conveyor belt includes:

[0008] The first conveyor belt is used to transport coal;

[0009] A second conveyor belt is disposed below the first conveyor belt and is used to catch the coal spilled from the first conveyor belt;

[0010] A cleaning mechanism, installed above the second conveyor belt, is used to scrape the coal off the second conveyor belt;

[0011] A collection container, located below the cleaning mechanism, is used to receive and hold the scraped-off coal;

[0012] A triggering mechanism is used to detect the amount of coal accumulated in the collection container and output a trigger signal when the amount of coal accumulated reaches a predetermined triggering condition. The trigger signal is used to control the first conveyor belt to stop.

[0013] In one possible implementation, the triggering mechanism includes a suspension assembly and an emergency stop switch;

[0014] The trigger of the emergency stop switch is connected to the collection container through the suspension assembly; the suspension assembly converts the gravity of the collection container into a pulling force on the trigger. When the weight of the coal in the collection container reaches a preset weight threshold, the pulling force drives the emergency stop switch to operate and outputs the trigger signal.

[0015] In one possible implementation, the suspension assembly includes a pulley system and a pull rope, the pull rope passing around the pulley system; one end of the pull rope is connected to the collection container, and the other end is connected to the trigger.

[0016] In one possible implementation, the suspension assembly further includes a lever mechanism, which includes a fulcrum, a first lever arm, and a second lever arm. One end of the first lever arm is connected to the pull rope, and one end of the second lever arm is connected to the trigger. The length of the first lever arm is less than the length of the second lever arm.

[0017] In one possible implementation, the collection container is mounted on a support base; the triggering mechanism includes a pressure sensor mounted on the support base, used to detect the pressure generated by the weight of the coal in the collection container, and to output the trigger signal when the pressure reaches a preset pressure threshold.

[0018] In one possible implementation, the collection container is suspended by an elastic element;

[0019] The triggering mechanism includes a displacement sensor, which is used to detect the sinking displacement of the collection container caused by the increase in the weight of the coal, and outputs the trigger signal when the sinking displacement reaches a preset displacement threshold.

[0020] In one possible implementation, the triggering mechanism includes a level switch, which is installed on the inner wall of the collection container;

[0021] The material level switch is used to detect the accumulation height of the coal and outputs the trigger signal when the accumulation height reaches a preset material level threshold.

[0022] In one possible implementation, the triggering mechanism includes a pneumatic balancing system and a pressure switch, the pneumatic balancing system being used to balance the weight of the collection container;

[0023] The pressure switch is used to detect the air pressure of the pneumatic balance system and outputs the trigger signal when the air pressure reaches a preset air pressure threshold.

[0024] In one possible implementation, the cleaning mechanism includes:

[0025] The bracket is fixedly installed above the second conveyor belt;

[0026] A scraper, fixed to the bracket, includes two scraper units; one end of the two scraper units is connected to each other to form a connecting end, and the other end extends to both sides respectively, so that the two scraper units form an included angle of 60° to 120°; along the running direction of the second conveyor belt, the connecting end of the scraper unit is located downstream of the other end; the collection container is located below the connecting end of the two scraper units;

[0027] An angle adjustment mechanism is connected between the bracket and the scraper, and is used to adjust the contact angle between the scraper and the surface of the second conveyor belt.

[0028] In one possible implementation, the bottom of the collection container is provided with an openable discharge door for discharging the coal inside.

[0029] The automatic coal spillage protection device for a coal conveyor belt disclosed in this application operates as follows: When coal spills from the first conveyor belt due to misalignment, overload, or puncture by a foreign object, the coal falls onto the second conveyor belt below under gravity. The second conveyor belt transports the spilled coal, which is scraped off by the cleaning mechanism and falls into a collection container. As the spilled coal continues to move, it accumulates in the collection container, and a triggering mechanism continuously monitors this accumulation process. When the accumulated amount reaches a predetermined trigger condition before reaching a dangerous level, the triggering mechanism immediately sends a trigger signal to stop the first conveyor belt, thus achieving automatic protection.

[0030] Compared to related technologies, the automatic coal spillage protection device for coal conveyor belts disclosed in this application, through the cooperation of upper and lower double-layer conveyor belts, transforms coal spillage events that could originally occur at any location on the first conveyor belt into detectable coal accumulation at the cleaning mechanism, thereby achieving full coverage protection for the entire conveyor line. This design eliminates the blind spots of traditional fixed detection devices, effectively detecting coal spillage whether it occurs at the head, middle, or tail of the first conveyor belt. Simultaneously, the second conveyor belt's conveying process provides a certain time buffer, effectively avoiding malfunctions caused by momentary disturbances and improving the reliability of the protection. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of the automatic coal spillage protection device for the coal conveyor belt disclosed in the embodiments of this application;

[0033] Figure 2 This is a schematic diagram of the suspension assembly and collection container disclosed in the embodiments of this application;

[0034] Figure 3 This is a flowchart illustrating the operation of the automatic coal spillage protection device for a coal conveyor belt disclosed in an embodiment of this application.

[0035] The attached figures are labeled as follows:

[0036] 10. Coal;

[0037] 100. First conveyor belt;

[0038] 200. Second conveyor belt;

[0039] 300. Cleaning organization;

[0040] 400. Collection container; 410. Discharge door;

[0041] 500. Triggering mechanism; 510. Suspension assembly; 511. Pulley block; 512. Pull rope; 520. Emergency stop switch. Detailed Implementation

[0042] The purpose of this application is to disclose an automatic protection device for coal spillage on a coal conveyor belt, so as to realize automatic detection and full coverage of coal spillage on the coal conveyor belt.

[0043] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0044] like Figure 1 As shown, the automatic coal spillage protection device for a coal conveyor belt disclosed in this application includes a first conveyor belt 100, a second conveyor belt 200, a cleaning mechanism 300, a collection container 400, and a triggering mechanism 500.

[0045] The first conveyor belt 100, located at the top, undertakes the main task of transporting coal 10. Its width is typically 800mm to 1400mm, and its belt speed is approximately 2m / s to 3m / s. A second conveyor belt 200 is positioned directly below the first conveyor belt 100, with a vertical distance between them typically 1.5m to 3m, sufficient to accommodate the subsequent cleaning mechanism 300. The width of the second conveyor belt 200 is preferably equal to or slightly larger than the width of the first conveyor belt 100 to ensure it can fully catch any coal 10 spilled from any position on the first conveyor belt 100.

[0046] A cleaning mechanism 300 is installed above the second conveyor belt 200, and the cleaning mechanism 300 can be fixed on the frame of the second conveyor belt 200. When the spilled coal 10 falls on the surface of the second conveyor belt 200, it will move with the second conveyor belt 200. When it passes the cleaning mechanism 300, the cleaning mechanism 300 scrapes the coal 10 off the surface of the second conveyor belt 200.

[0047] A collection container 400 is located directly below the cleaning mechanism 300. The scraped coal 10 falls into the collection container 400 under gravity for temporary storage. The collection container 400 can be welded from 3mm to 6mm thick Q235 steel plate or stainless steel plate, and the interior can be lined with wear-resistant ceramic sheets or polyurethane lining to extend its service life. The angle between the side wall and the bottom of the hopper should be greater than the angle of repose of the coal, typically 35° to 45°, to ensure that the coal can slide smoothly without sticking to the wall.

[0048] A triggering mechanism 500 is installed near the collection container 400. This triggering mechanism 500 is associated with the collection container 400 and can sense the accumulation level of coal 10 in the collection container 400 in real time. When the accumulation reaches a predetermined trigger condition, the triggering mechanism 500 will output a trigger signal. This trigger signal is used to control the cutting off of the power supply to the drive motor in the drive circuit of the first conveyor belt 100, causing the first conveyor belt 100 to stop urgently.

[0049] During operation, the automatic coal spillage protection device for the coal conveyor belt disclosed in this application, when the first conveyor belt 100 spills coal due to reasons such as deviation, overload, or foreign object puncture, the coal 10 falls from the first conveyor belt 100 and falls into the second conveyor belt 200 below under the action of gravity. The second conveyor belt 200 transports the spilled coal 10, and when it passes the cleaning mechanism 300, the coal 10 is scraped off and falls into the collection container 400. As the coal spillage continues, the coal 10 in the collection container 400 continuously accumulates, and the triggering mechanism 500 continuously monitors this accumulation process. When the accumulation reaches a predetermined trigger condition before a dangerous level is reached, the triggering mechanism 500 immediately sends a trigger signal to stop the first conveyor belt 100, thereby achieving automatic protection.

[0050] Compared to related technologies, the automatic coal spillage protection device for a coal conveyor belt disclosed in this application, through the cooperation of upper and lower double-layer conveyor belts, transforms a coal spillage event that could originally occur at any location on the first conveyor belt 100 into a detectable coal accumulation at the cleaning mechanism 300, thereby achieving full coverage protection for the entire conveying line. This design eliminates the blind spots of traditional fixed detection devices, ensuring effective detection regardless of whether the coal spillage occurs at the head, middle, or tail of the first conveyor belt 100. Simultaneously, the conveying process of the second conveyor belt 200 provides a certain time buffer, effectively avoiding malfunctions caused by instantaneous disturbances and improving the reliability of the protection.

[0051] like Figure 2 As shown, the triggering mechanism 500 may include a suspension assembly 510 and an emergency stop switch 520. One end of the suspension assembly 510 is fixedly connected to the collection container 400, and the other end is connected to the trigger element of the emergency stop switch 520. The emergency stop switch 520 itself can be fixedly installed on the frame of the second conveyor belt 200 or a nearby column, and its trigger element is typically a movable pull ring or pull rod. The collection container 400 is suspended by the suspension assembly 510, and its own weight and the weight of the coal 10 inside are both borne by the suspension assembly 510. Furthermore, the suspension assembly 510 converts the downward vertical weight of the collection container 400 into a pulling force acting on the trigger element.

[0052] The emergency stop switch 520 can be modified from the original manual pull rope switch. By adding the suspension component 510, automatic protection can be achieved, resulting in low implementation costs. At the same time, since the original manual operation function of the emergency stop switch 520 can be retained, the operator can still directly pull the pull rope to stop the machine in case of automatic system failure or emergency intervention, ensuring safety redundancy.

[0053] The following is combined Figure 3 The flowchart shown below provides a detailed explanation of the complete workflow of this embodiment:

[0054] In the initial state, the first conveyor belt 100 starts and runs normally, carrying and conveying coal 10. At this time, the second conveyor belt 200 runs normally in sync, the collection container 400 is in an empty or low-load state, the tension transmitted from the suspension component 510 to the trigger of the emergency stop switch 520 is less than the action threshold, the emergency stop switch 520 remains closed, the drive control circuit of the first conveyor belt 100 is energized, and the system is in a monitoring ready state.

[0055] When coal spills from the first conveyor belt 100 due to misalignment, overloading, or puncture by a foreign object, the coal 10 falls from the edge of the first conveyor belt 100 and, under the influence of gravity, falls into the second conveyor belt 200 below. The second conveyor belt 200 transports the spilled coal 10. Subsequently, the coal 10 is transported to the cleaning mechanism 300, where it is cleaned and falls into the collection container 400 below.

[0056] Coal spreading continues, and coal 10 accumulates in the collection container 400. As the total weight of the collection container 400 gradually increases, the suspension assembly 510 generates a downward pulling force on the trigger of the emergency stop switch 520, and the tension in the pull rope 512 increases with the weight of the coal 10. If coal spreading stops or the amount spread is small, and the weight of coal 10 in the collection container 400 does not reach the preset weight threshold, the tension in the pull rope 512 is less than the actuating force of the emergency stop switch 520. The emergency stop switch 520 remains closed, the first conveyor belt 100 continues to run, and the collection container 400 continues to wait for the next coal spreading cycle.

[0057] If coal continues to be spread, and the weight of coal 10 in the collection container 400 reaches a preset weight threshold, the tension of the pull rope 512 will reach or exceed the operating force of the emergency stop switch 520. The emergency stop switch 520 will then activate, and its normally closed contact will open. After the emergency stop switch 520 activates, its normally closed contact will open, de-energizing the drive control circuit of the first conveyor belt 100. The main circuit will be cut off, and the first conveyor belt 100 will stop in an emergency, terminating the coal spreading process and preventing further accumulation of coal 10 and its entanglement in the drum, which could cause belt damage. Simultaneously, the alarm circuit will activate, and the audible and visual alarm will be activated to alert the operator.

[0058] Upon receiving the alarm signal, the operator arrives at the scene, troubleshoots the fault in the first conveyor belt 100, and then opens the discharge door 410 at the bottom of the collection container 400 to clear the accumulated coal 10. After the coal 10 in the collection container 400 is emptied, the tension of the pull rope 512 decreases, and the emergency stop switch 520 automatically resets or can be manually reset by the operator. The first conveyor belt 100 is then restarted, and the system returns to normal operation.

[0059] In one embodiment, the suspension assembly 510 may include a pulley block 511 and a pull rope 512. The pulley block 511 consists of at least one fixed pulley and is fixedly installed on the frame above the emergency stop switch 520. Lifting lugs are symmetrically welded to the outer walls of both sides of the collection container 400 to ensure that the collection container 400 remains balanced and does not tilt during suspension. The lifting lugs are made of steel plate with a central hole slightly larger in diameter than the pull rope 512 to facilitate rope threading. The pull rope 512 may be made of galvanized steel wire rope with a diameter of 6mm to 10mm, possessing sufficient tensile strength and corrosion resistance to ensure a sufficient safety factor.

[0060] The pull rope 512 originates from the lifting lug of the collection container 400, winds upwards around the pulley groove of the pulley block 511, and then extends to and is fixedly connected to the trigger of the emergency stop switch 520. The gravity of the collection container 400 is vertically downward, while the trigger of the emergency stop switch 520 typically requires horizontal tension to operate. Guided by the pulley block 511, the pull rope 512 converts the vertically downward gravity into a horizontal tension, thus adapting to the operation of the emergency stop switch 520. This allows for flexible arrangement of the relative positions of the collection container 400 and the emergency stop switch 520 according to site space conditions, without being limited by the installation angle. Simultaneously, the rolling friction characteristics of the pulley block 511 ensure high force transmission efficiency and low loss, guaranteeing the sensitivity and accuracy of the detection. An adjusting bolt can also be connected to one end of the pull rope 512 to adjust its tension and length.

[0061] Based on the above structure, a lever mechanism can be added to the suspension assembly 510. The lever mechanism includes a fixed fulcrum, a first lever arm, and a second lever arm. One end of the first lever arm is connected to a pull rope 512 from the collection container 400, and one end of the second lever arm is connected to the trigger of the emergency stop switch 520. The fulcrum is located at the junction of the first and second lever arms. The length of the first lever arm is designed to be shorter than the length of the second lever arm; that is, the first lever arm is shorter and the second lever arm is longer. This lever mechanism attenuates the pulling force on the pull rope 512. For example, when the length ratio of the first lever arm to the second lever arm is 1:10, the pulling force on the trigger is only one-tenth of the pulling force on the pull rope 512.

[0062] In the direct suspension scheme, the weight of the collection container 400 plus a small amount of coal can generate a significant pulling force, which could easily cause the emergency stop switch 520 to be falsely triggered when unloaded or with only a small amount of coal accumulation, affecting normal production. By introducing a lever mechanism to attenuate the pulling force, the pulling force on the trigger element when unloaded can be made much less than the actuating force of the emergency stop switch 520, thus effectively preventing false triggering. At the same time, the lever mechanism provides greater flexibility in system design, allowing the use of common standard models of emergency stop switches 520 on the market, without the need for custom-made high-force special switches.

[0063] In another specific embodiment, the collection container 400 is fixedly mounted on the conveyor belt frame or the ground via a rigid support. One or more pressure sensors are installed on the contact surface between the support and the collection container 400. The pressure sensors can be resistance strain gauge load cells or piezoelectric pressure switches, with their sensitive surfaces in close contact with the bottom of the collection container 400. As coal 10 accumulates inside the collection container 400, the total weight of the container increases, generating increasing pressure on the support below. The pressure sensors detect the pressure value in real time and convert it into an electrical signal. When the pressure value reaches a preset pressure threshold, the pressure sensor outputs an electrical signal as a trigger signal to cut off the drive circuit of the first conveyor belt 100. The use of pressure sensors enables digital and high-precision detection, allowing for the setting of multiple alarm thresholds, such as early warning, alarm, and shutdown, achieving refined hierarchical protection. Simultaneously, the pressure signal can be easily connected to the power plant's control system for remote monitoring and data recording, facilitating operation management and accident analysis.

[0064] In another specific embodiment, the collecting container 400 can also be suspended by an elastic element, which can be a helical compression spring, a disc spring, or a rubber spring, with its upper end fixed to the frame and its lower end connected to the collecting container 400. A displacement sensor is installed above or on the side of the collecting container 400; this sensor can be a wire encoder, a laser rangefinder, or a proximity switch. As the amount of coal 10 inside the collecting container 400 increases, its total weight increases, the elastic element is gradually compressed, and the collecting container 400 as a whole undergoes a downward displacement. The displacement sensor continuously monitors this downward displacement, and when the downward displacement reaches a preset displacement threshold, the displacement sensor outputs a trigger signal. The introduction of the elastic element gives the system a certain degree of flexibility, which can absorb the impact load when coal falls into the collecting container 400, reducing the possibility of malfunction. Furthermore, by replacing the elastic element with one of different stiffnesses, the sensitivity range of the system can be easily adjusted to adapt to the needs of different working conditions.

[0065] In another specific embodiment, a level switch is installed on the inner wall of the collection container 400, near the upper part. The level switch can be a rotary paddle level switch or a tuning fork level switch, with its probe extending into the internal space of the collection container 400. The installation height of the level switch is determined based on the preset coal accumulation height corresponding to the preset coal quantity, i.e., a preset level threshold. As coal 10 continuously accumulates within the collection container 400, the coal level gradually rises. When the coal level rises to the height of the level switch probe, the coal 10 contacts the probe, the level switch detects the presence of material, and outputs a trigger signal. This detection method directly measures the coal level height; the detection principle is intuitive and simple, and it is not affected by changes in the weight or structural deformation of the collection container 400 itself.

[0066] In another specific embodiment, the collection container 400 is supported by a pneumatic balancing system. The pneumatic balancing system may include a cylinder or air bladder, whose piston rod or bearing surface is connected to the collection container 400, and whose air inlet is connected to a stable compressed air source. A pressure switch is installed in the air circuit to monitor the air pressure within the system. The pneumatic balancing system generates an upward thrust by adjusting the air pressure to balance part or all of the weight of the collection container 400. When coal 10 accumulates in the collection container 400, the total weight increases, the cylinder or air bladder is compressed, and the air pressure within the system rises. The pressure switch monitors the air pressure changes in real time; when the air pressure rises to a preset air pressure threshold, the pressure switch activates and outputs a trigger signal. The pneumatic balancing system has the advantages of high responsiveness and long-distance signal transmission. Simultaneously, the pneumatic system itself has explosion-proof characteristics, providing a natural safety advantage in locations with a risk of coal dust explosions.

[0067] To achieve automatic coal collection and cleaning, the cleaning mechanism 300 may include a support, a scraper, and an angle adjustment mechanism. The support is a triangular frame structure welded from angle steel or channel steel, and is fixedly installed on the belt conveyor frame above the second conveyor belt 200 by bolts or welding. The height of the support can be adjusted by using elongated holes and bolts to accommodate the height of the second conveyor belt 200 of different specifications.

[0068] The scraper consists of two scraper units, each a rectangular flat plate made of polyurethane or wear-resistant rubber, offering excellent wear resistance and elasticity. This design prevents damage to the belt surface while maintaining long-term cleaning effectiveness. One end of each scraper unit is brought together and fixedly connected, forming a connecting end. The other ends extend outwards to both sides, creating an angle between the two scraper units, ranging from 60° to 120°. During installation, the connecting end of the two scraper units faces the running direction of the second conveyor belt 200, i.e., the connecting end is downstream, and the open end is upstream. The collection container 400 is located directly below the connecting end of the two scraper units. When the second conveyor belt 200 carries spilled coal 10, the coal 10 first reaches the open end of the two scraper units. As the belt continues to move, the coal 10 is guided by the two scraper units and gradually converges towards the center, eventually being scraped off the belt surface at the connecting end and falling into the collection container 400 directly below under gravity.

[0069] The angle adjustment mechanism is connected between the support and the scraper. By rotating the handwheel, the threaded pair is driven to make the scraper rotate around the hinge point on the support, thereby changing the angle between the scraper and the surface of the second conveyor belt 200. The working state of the scraper can be optimized at any time according to the wear of the belt and the moisture content of the coal.

[0070] To facilitate system reset after fault handling, a discharge door 410 is installed at the bottom of the collection container 400. The discharge door 410 can be a slide-in type or a flap-type structure. Taking the flap-type structure as an example, the discharge door 410 can consist of a cover plate hinged to the bottom of the collection container 400, and its opening and closing is controlled by a handle or pneumatic actuator. During normal operation, the discharge door 410 is in the closed state, ensuring that the collection container 400 can accumulate coal 10 normally and trigger protection. When the coal spillage fault is resolved, the discharge door 410 is opened to discharge the accumulated coal 10 from the collection container 400, restoring the collection container 400 to an unloaded state. After the coal 10 is completely discharged, the discharge door 410 is closed, and the system can be restarted. The discharged coal 10 can be recycled, reducing fuel waste.

[0071] The terms "first" and "second," etc., used in this application are used to distinguish different objects, not to describe a specific order, and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units may include steps or units not listed, but rather steps or units not listed.

[0072] In the description of this application, it should be understood that the terms "height," "thickness," "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. In the description of this application, "a plurality of" means two or more, and "at least one" can mean one, two, or more, unless otherwise expressly specified.

[0073] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Specific technical means in some embodiments may be incorporated, in whole or in part, into another embodiment unless explicitly excluded by another embodiment. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An automatic protection device for coal spillage on a coal conveyor belt, characterized in that, include: The first conveyor belt (100) is used to transport coal (10); The second conveyor belt (200) is disposed below the first conveyor belt (100) and is used to receive the coal (10) spilled from the first conveyor belt (100). A cleaning mechanism (300) is installed above the second conveyor belt (200) for scraping the coal (10) off the second conveyor belt (200); A collection container (400) is disposed below the cleaning mechanism (300) for receiving and containing the scraped coal (10). The triggering mechanism (500) is used to detect the amount of coal (10) accumulated in the collection container (400) and output a trigger signal when the amount of coal (10) reaches a predetermined triggering condition. The trigger signal is used to control the first conveyor belt (100) to stop.

2. The automatic coal spillage protection device for coal conveyor belts as described in claim 1, characterized in that, The triggering mechanism (500) includes a suspension assembly (510) and an emergency stop switch (520). The trigger of the emergency stop switch (520) is connected to the collection container (400) through the suspension assembly (510); the suspension assembly (510) converts the gravity of the collection container (400) into a pulling force on the trigger. When the weight of the coal (10) in the collection container (400) reaches a preset weight threshold, the pulling force drives the emergency stop switch (520) to operate and output the trigger signal.

3. The automatic coal spillage protection device for coal conveyor belts as described in claim 2, characterized in that, The suspension assembly (510) includes a pulley assembly (511) and a pull rope (512) that passes around the pulley assembly (511); one end of the pull rope (512) is connected to the collection container (400) and the other end is connected to the trigger.

4. The automatic coal spillage protection device for coal conveyor belts as described in claim 3, characterized in that, The suspension assembly (510) further includes a lever mechanism, which includes a fulcrum, a first lever arm, and a second lever arm. One end of the first lever arm is connected to the pull rope (512), and one end of the second lever arm is connected to the trigger. The length of the first lever arm is less than the length of the second lever arm.

5. The automatic coal spillage protection device for coal conveyor belts as described in claim 1, characterized in that, The collection container (400) is mounted on a support base; the triggering mechanism (500) includes a pressure sensor mounted on the support base, which is used to detect the pressure generated by the weight of the coal (10) in the collection container (400) and output the trigger signal when the pressure reaches a preset pressure threshold.

6. The automatic coal spillage protection device for coal conveyor belts as described in claim 1, characterized in that, The collection container (400) is suspended by an elastic element; The triggering mechanism (500) includes a displacement sensor, which is used to detect the sinking displacement of the collection container (400) due to the increase in the weight of the coal (10), and outputs the trigger signal when the sinking displacement reaches a preset displacement threshold.

7. The automatic coal spillage protection device for coal conveyor belts as described in claim 1, characterized in that, The triggering mechanism (500) includes a level switch, which is installed on the inner wall of the collection container (400); The material level switch is used to detect the stacking height of the coal (10) and outputs the trigger signal when the stacking height reaches the preset material level threshold.

8. The automatic coal spillage protection device for coal conveyor belts as described in claim 1, characterized in that, The triggering mechanism (500) includes a pneumatic balancing system and a pressure switch, the pneumatic balancing system being used to balance the weight of the collection container (400); The pressure switch is used to detect the air pressure of the pneumatic balance system and outputs the trigger signal when the air pressure reaches a preset air pressure threshold.

9. The automatic coal spillage protection device for coal conveyor belts as described in claim 1, characterized in that, The cleaning mechanism (300) includes: The bracket is fixedly installed above the second conveyor belt (200); A scraper, fixed to the bracket, includes two scraper units; one end of the two scraper units is connected to each other to form a connecting end, and the other end extends to both sides respectively, so that the two scraper units form an angle between them, the angle being 60° to 120°; along the running direction of the second conveyor belt (200), the connecting end of the scraper unit is located downstream of the other end; the collection container (400) is located below the connecting end of the two scraper units; An angle adjustment mechanism is connected between the bracket and the scraper, and is used to adjust the contact angle between the scraper and the surface of the second conveyor belt (200).

10. The automatic coal spillage protection device for coal conveyor belts as described in claim 1, characterized in that, The bottom of the collection container (400) is provided with an openable discharge door (410) for discharging the coal (10) inside.

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