State monitoring system

Abstract

The invention relates to the technical field of coal feeders, in particular to a state monitoring system which comprises a monitoring device, a microprocessor and a distributed control module. The monitoring device is arranged between a belt of the coal feeder and a cleaning scraper chain and is used for emitting light to a no-load section of the belt and outputting an imaging digital signal; and the microprocessor is connected with the monitoring device and the distributed control module and is used for converting the imaging digital signal into one of a'normal belt 'signal, a'abnormal belt' signal, a'broken belt 'signal and a'abnormal monitoring device' signal and transmitting the signal to the distributed control module. According to the state monitoring system, the monitoring device can be automatically started, so that any state of deviation, damage, tearing or overall fracture of the belt can be monitored in real time, and auxiliary operation personnel can be timely notified to judge and process faults.

Description

Technical Field

[0001] The invention relates to the technical field of coal feeders, and in particular to a state monitoring system. Background Art

[0002] The coal feeder belt has the following common abnormal conditions: deviation, damage, tearing and overall breakage. Among them, deviation, breakage and tearing will not only affect the measurement of coal weight and the transportation of raw coal, causing inaccurate actual coal feeding rate and imbalance of water-coal ratio of the unit, but may also cause further damage to the belt; the above abnormal conditions can only be discovered by naked eye observation at present; overall belt breakage will cause the mill group to break coal, and its early phenomenon is often manifested as a sudden change of the actual coal feeding rate to 0, which is the same as the common faults of coal feeders such as coal breakage and load sensor failure. The operating personnel need to go to the equipment to observe and confirm again, which is very likely to have an adverse impact on the safety and economic operation of the unit.

[0003] In view of this, the present invention is proposed. Summary of the invention

[0004] The invention provides a state monitoring system for solving the problem that a coal feeder belt cannot be automatically monitored when in an abnormal state.

[0005] The present invention provides a state monitoring system, comprising:

[0006] The monitoring device is arranged between the belt and the cleaning scraper chain at intervals along the extension direction of the belt, and is used to emit light to the unloaded section of the belt and output an imaging digital signal;

[0007] Microprocessor, distributed control module, the microprocessor is connected to the monitoring device and the distributed control module, the microprocessor is used to convert the imaging digital signal into one of the signals of "belt normal" signal, "belt abnormal" signal, "belt broken" signal and "monitoring device abnormal" signal, and transmit it to the distributed control module.

[0008] In some embodiments, the monitoring device comprises:

[0009] A laser scanner that shines light onto the unloaded section of the belt;

[0010] A photoelectric converter, used to receive the reflected light from the belt and convert it into an electrical signal;

[0011] The decoder is used to convert the electrical signal into an imaging digital signal and send it to the microprocessor.

[0012] In some of the embodiments, when the belt is in a normal state, the monitoring device is used to output an imaging digital signal a, and the microprocessor outputs a "belt normal" signal to the distributed control module.

[0013] In some of the embodiments, when the belt deviates, is damaged or torn, the monitoring device is used to output one of the imaging digital signal b, the imaging digital signal c, and the imaging digital signal d, and the microprocessor outputs a "belt abnormality" signal to the distributed control module.

[0014] In some of the embodiments, when the belt deviates, the monitoring device is used to output an imaging digital signal b, and the microprocessor outputs a "belt abnormality" signal to the distributed control module.

[0015] In some of the embodiments, when the belt is damaged or torn, the monitoring device is used to output an imaging digital signal c or an imaging digital signal d, and the microprocessor is used to output a "belt abnormality" signal to the distributed control module.

[0016] In some of the embodiments, when the belt is broken as a whole, the monitoring device is used to output one of the imaging digital signal b, the imaging digital signal e or the imaging digital signal f, and the microprocessor is used to output a "broken belt" signal to the distributed control module.

[0017] In some of the embodiments, when the monitoring device does not output one of the imaging digital signal a, imaging digital signal b, imaging digital signal c, imaging digital signal d, imaging digital signal e, and imaging digital signal f, and / or when the microprocessor does not output one of the "belt normal" signal, "belt abnormal" signal, and "belt broken" signal, the microprocessor is used to output a "monitoring device abnormal" signal to the distributed control module.

[0018] In some embodiments, when the driving motor of the belt is started at a first time interval T1, the monitoring device is started and monitors the belt once;

[0019] Alternatively, when the coal feeder is running and the coal supply is normal, the monitoring device is started after a delay of the second time interval T2, and is started once every third time interval T3, so as to regularly monitor the belt;

[0020] Alternatively, when the amount of coal on the belt changes suddenly and the gate on the coal feeder is not in the fully closed position, the monitoring device starts after a delay of the fourth time interval T4 and sends a fault handling notification to the auxiliary operation personnel.

[0021] In some embodiments, at the minimum rotation speed of the driving motor, the time required for the belt to run one circle is the fifth time interval T0, and the operation time of the monitoring device is greater than or equal to the fifth time interval T0.

[0022] In some embodiments, the first time interval T1 is 3 seconds, the second time interval T2 is 3 seconds, the third time interval T3 is 600 seconds, and the fourth time interval T4 is 10 seconds.

[0023] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: in the state monitoring system of the present invention, the monitoring device is arranged between the belt and the cleaning scraper chain at intervals along the belt extension direction, and is used to emit light to the unloaded section of the belt and output an imaging digital signal; the microprocessor is connected to the monitoring device and the distributed control module, and is used to convert the imaging digital signal into one of the "belt normal" signal, "belt abnormal" signal, "belt broken" signal, and "monitoring device abnormal" signal, and transmit it to the distributed control module. The state monitoring system can realize the automatic start of the monitoring device to monitor any state of the belt deviation, damage, tearing or overall breakage in real time, and can promptly notify the auxiliary operation personnel to judge and handle the fault. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a structural schematic diagram of a coal feeder in an embodiment of the present invention;

[0025] Figure 2 It is a schematic diagram of the installation of a monitoring device between the belt and the cleaning scraper chain;

[0026] Figure 3 It is a structural schematic diagram of the state monitoring system of the present invention;

[0027] Figure 4a It is a schematic diagram of the imaging of two monitoring devices when the belt is in normal condition;

[0028] Figure 4b It is an imaging schematic diagram of two monitoring devices when the belt is deviating or broken as a whole;

[0029] Figure 4c It is a schematic diagram of the imaging of two monitoring devices when the belt is damaged or torn;

[0030] Figure 4d It is a schematic diagram of the imaging of two monitoring devices when the belt is damaged or torn;

[0031] Figure 4e It is another imaging schematic diagram of two monitoring devices in the state of overall belt fracture;

[0032] Figure 4f It is another imaging schematic diagram of two monitoring devices in the state of overall belt fracture;

[0033] Figure 5 It is a simple logic diagram of the monitoring device when it is working.

[0034] In the figure: 100, monitoring device; 110, laser scanner; 120, photoelectric converter; 130, decoder; 200, microprocessor; 300, distributed control module; 1, belt; 2, supporting cross roller; 3, load sensor; 4, weighing roller; 5, baffle of coal break signal device; 6, roller; 7, weighing calibration block; 8, driving sprocket; 9, cleaning scraper chain. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] For background information, see Figure 1 The coal feeder includes: a belt 1; a supporting cross roller 2; a load sensor 3; a weighing roller 4; a baffle 5 for a coal break signal device; a roller 6; a weighing calibration block 7; a driving sprocket 8; and a cleaning scraper chain 9. After starting the coal feeder, the microprocessor 200 in the coal feeder control cabinet receives a coal feeding rate setting value signal. The belt speed under the coal feeding rate and coal weight is calculated according to the following formula: belt speed (m / h) = coal feeding rate (t / h) / coal weight (t / m), and generates a corresponding speed instruction of the driving motor of the belt 1. The driving motor of the belt 1 is a variable speed motor, which controls the driving motor to drive the roller 6 to rotate and drive the belt 1 to move. Among them, the coal weight signal is output by the load sensor, and the corresponding relationship between the speed of the belt 1 and the speed of the driving motor of the belt 1 is a linear function, and the constant of the linear function can be determined by determination.

[0037] Since belt 1 has several abnormal conditions such as deviation, damage, tearing and overall fracture, deviation, damage and tearing will affect the coal weight measurement and raw coal transportation, resulting in inaccurate actual coal feeding rate and imbalance of unit water-coal ratio, which may cause further damage to belt 1; the above abnormal conditions are currently only discovered by naked eye observation. Overall fracture of belt 1 will cause the mill group to be out of coal. The early phenomenon is that the actual coal feeding rate suddenly changes to 0, which is the same as the common fault phenomenon of coal feeder such as coal outage and load sensor failure. The auxiliary operation personnel need to go to the equipment to observe and confirm again, which is very likely to have an adverse impact on the safety and economic operation of the unit.

[0038] An embodiment of the present invention provides a state monitoring system, referring to Figures 2 to 5The state monitoring system includes: a monitoring device 100, a microprocessor 200 and a distributed control module 300 (abbreviated as DCS). There are two monitoring devices 100, and the two monitoring devices 100 are arranged between the belt 1 of the coal feeder and the cleaning scraper chain 9 along the extension direction of the belt 1, and are used to emit light to the unloaded section of the belt 1 and output an imaging digital signal. The microprocessor 200 is connected to the monitoring device 100, and the microprocessor 200 is arranged in the control cabinet of the coal feeder, and is used to convert the imaging digital signal into one of a "belt normal" signal, a "belt abnormal" signal, a "belt broken" signal, and a "monitoring device abnormal" signal. The distributed control module 300 is connected to the microprocessor 200, and is used to receive one of a "belt normal" signal, a "belt abnormal" signal, a "belt broken" signal, and a "monitoring device abnormal" signal output by the microprocessor 200.

[0039] The state monitoring system of the present invention is configured by arranging a monitoring device 100 between the belt 1 of the coal feeder and the cleaning scraper chain 9. The monitoring device 100 is used to emit light to the unloaded section of the belt 1 and output an imaging digital signal. The microprocessor 200 is connected to the monitoring device 100 and is used to convert the imaging digital signal into one of a "belt normal" signal, a "belt abnormal" signal, a "belt broken" signal, and a "monitoring device abnormal" signal. The distributed control module 300 is connected to the microprocessor 200 and is used to receive one of a "belt normal" signal, a "belt abnormal" signal, a "belt broken" signal, and a "monitoring device abnormal" signal output by the microprocessor 200. Therefore, the condition monitoring system of the present invention can judge the real-time state of the belt 1 of the coal feeder through the monitoring device 100 and output an imaging digital signal based on the state of the belt 1. The monitoring device 100 and the distributed control module 300 are connected through the microprocessor 200. The microprocessor 200 can convert the imaging digital signal of the belt 1 into one of the "belt normal" signal, "belt abnormal" signal, "belt broken" signal, and "monitoring device abnormal" signal, and output it to the distributed control module 300. Therefore, the condition monitoring system of the present invention can realize the automatic start function of the monitoring device 100 to monitor any state of the deviation, damage, tearing or overall breakage of the belt 1 in real time, and can promptly notify the auxiliary operation personnel to judge and handle the fault.

[0040] It should be noted that two monitoring devices 100 are installed between the belt 1 and the cleaning scraper chain 9. The installation positions of the two monitoring devices 100 should not be too close, and should avoid the position of the feed port directly facing the coal feeder and the position of the discharge port of the coal feeder to avoid coal dust interfering with the measurement. If the coal feeder transports coal with large coal dust for a long time, the state monitoring system of the present invention also includes a purge air duct or a cleaning scraper. By adding a purge air duct or a cleaning scraper, the monitoring device 100 can be prevented from being dirty.

[0041] In some embodiments, such as Figure 3 As shown, the monitoring device 100 includes: a laser scanner 110, a photoelectric converter 120 and a decoder 130. The laser scanner 110 is used to emit light to the unloaded section of the belt 1. The photoelectric converter 120 is used to receive the reflected light of the belt 1 and convert it into an electrical signal. The decoder 130 is used to convert the electrical signal into an imaging digital signal and send it to the microprocessor 120. That is, the laser scanner 110 is used to emit light upward and irradiate the unloaded section of the belt 1, and the reflected light is imaged on the photoelectric converter 120, and is processed into a digital signal by the decoder 130 and sent to the microprocessor 200 in the coal feeder control cabinet, and then outputs the corresponding signal to the distributed control module 300.

[0042] In some embodiments, such as Figure 4a As shown, when the horizontal position of the belt 1 is located in the center of the coal feeder, the belt 1 is in a normal state, the monitoring device 100 outputs the imaging digital signal a, and the microprocessor 200 converts the imaging digital signal a into a "belt normal" signal and outputs the "belt normal" signal to the distributed control module 300. It should be added that the surface of the belt 1 in a normal state is relatively smooth, the diffuse reflection coefficient of the belt 1 is relatively small, the luminous flux of the reflected light is larger than that of other parts, and the horizontal position of the belt 1 is located in the center of the coal feeder. The imaging digital signal output by the monitoring device 100 is as shown in FIG. Figure 4a As shown, when both monitoring devices 100 are imaged in this manner, the microprocessor 200 outputs a “belt normal” signal to the distributed control module 300 .

[0043] In some embodiments, such as Figure 4b , Figure 4c , Figure 4d As shown, when the belt 1 deviates, is damaged or torn, the monitoring device 100 is used to output one of the imaging digital signal b, the imaging digital signal c, and the imaging digital signal d, and the microprocessor 200 is used to output a "belt abnormality" signal to the distributed control module 300. Specifically, when the belt 1 deviates, is damaged or torn, the monitoring device 100 outputs one of the imaging digital signal b, the imaging digital signal c, and the imaging digital signal d, and the microprocessor 200 is used to convert any one of the imaging digital signal b, the imaging digital signal c, and the imaging digital signal d into a "belt abnormality" signal, and is used to output the "belt abnormality" signal to the distributed control module 300.

[0044] In some embodiments, such as Figure 4bAs shown, when the belt 1 deviates, the monitoring device 100 is used to output the imaging digital signal b, and the microprocessor 200 is used to output the "belt abnormality" signal to the distributed control module 300. Specifically, when the belt 1 deviates, the monitoring device 100 is used to output the imaging digital signal b, and the microprocessor 200 is used to convert the imaging digital signal b into the "belt abnormality" signal and output the "belt abnormality" signal to the distributed control module 300.

[0045] In some embodiments, such as Figure 4c , Figure 4d As shown, when the belt 1 is damaged or torn, the monitoring device 100 is used to output the imaging digital signal c or the imaging digital signal d, and the microprocessor 200 is used to output the "belt abnormality" signal to the distributed control module 300. Specifically, when the belt 1 is damaged, the monitoring device 100 is used to output the imaging digital signal c or the imaging digital signal d, and the microprocessor 200 is used to convert the imaging digital signal c or the imaging digital signal d into the "belt abnormality" signal, and is used to output the "belt abnormality" signal to the distributed control module 300.

[0046] When the belt 1 is damaged or torn, the diffuse reflectance at the damaged or torn belt 1 is larger than that of the normal belt 1. Figure 4c or Figure 4d As shown, the monitoring device 100 outputs the imaging digital signal c or the imaging digital signal d. That is, when the imaging of the two monitoring devices 100 is as follows Figure 4b , Figure 4d Or any one of them is Figure 4c When, that is, when the two monitoring devices 100 output one of the imaging digital signal b, the imaging digital signal d, and the imaging digital signal c, the microprocessor 200 outputs a “belt abnormality” alarm signal to the distributed control module 300 .

[0047] In some embodiments, such as Figure 4b , Figure 4e , Figure 4f As shown, when the belt 1 is broken as a whole, the monitoring device 100 is used to output one of the imaging digital signal b, the imaging digital signal e, and the imaging digital signal f, and the microprocessor 200 is used to output a "broken belt" signal to the distributed control module 300. Specifically, when the belt 1 is broken as a whole, the monitoring device 100 is used to output one of the imaging digital signal b, the imaging digital signal e, and the imaging digital signal f, and the microprocessor 200 is used to convert one of the imaging digital signal b, the imaging digital signal e, and the imaging digital signal f into a "broken belt" signal, and to output a "broken belt" signal to the distributed control module 300. That is, when the belt 1 is broken as a whole, since the monitoring device 100 may be partially or completely covered by the belt 1, the imaging of the monitoring device 100 is Figure 4b , Figure 4e or Figure 4f As shown, when both monitoring devices 100 are imaged in this manner, the microprocessor 200 outputs a “broken belt” alarm signal to the distributed control module 300 .

[0048] In some embodiments, when the monitoring device 100 does not output one of the imaging digital signal a, imaging digital signal b, imaging digital signal c, imaging digital signal d, imaging digital signal e, and imaging digital signal f, and / or when the microprocessor 200 does not output one of the "belt normal" signal, "belt abnormal" signal, and "belt broken" signal, the microprocessor 200 is used to output a "monitoring device abnormal" signal to the distributed control module 300. In addition to the above situation, the microprocessor 200 outputs a "monitoring device abnormal" alarm signal to the distributed control module 300.

[0049] In some embodiments, such as Figure 5 As shown, when the driving motor of the belt 1 is started and the first time interval T1 passes, the monitoring device 100 is started and performs a monitoring on the belt 1. In some embodiments, the first time interval T1 is 3 seconds.

[0050] Or, in some other embodiments, such as Figure 5 As shown, when the coal feeder is running and the coal supply is normal, the monitoring device 100 is started after a delay of the second time interval T2, and is started once every third time interval T3 to regularly monitor the belt 1. In some embodiments, the second time interval T2 is 3 seconds; the third time interval T3 is 600 seconds.

[0051] Or, in some other embodiments, such as Figure 5 As shown, when the amount of coal on the belt 1 changes suddenly and the gate of the coal feeder is not in the fully closed position, the monitoring device 100 starts after a fourth time interval T4 and sends a notification of handling the fault to the auxiliary operator. In some embodiments, the fourth time interval T4 is 10 seconds.

[0052] In some other embodiments, when the gate plate on the coal feeder is not in the fully closed position, the coal feeder has a coal shortage failure, a load sensor failure, or an overall belt breakage failure, the monitoring device 100 starts and sends a notification to the auxiliary operating personnel to handle the fault.

[0053] In some embodiments, at the minimum speed of the driving motor of the belt 1, the time required for the belt 1 to run one circle is the fifth time interval T0, and the running time of the monitoring device 100 is greater than or equal to the fifth time interval T0. That is, the running time of the monitoring device 100 can be set, but the running time of the monitoring device 100 is not less than the time required for the belt 1 to run one circle at the minimum speed of the driving motor of the belt 1.

[0054] Therefore, the state monitoring system provided by the present invention is configured by arranging the monitoring device 100 between the belt 1 of the coal feeder and the cleaning scraper chain 9. The monitoring device 100 is used to emit light to the unloaded section of the belt 1 and output an imaging digital signal. The microprocessor 200 is connected to the monitoring device 100 and is used to convert the imaging digital signal into one of a "belt normal" signal, a "belt abnormal" signal, a "belt broken" signal, and a "monitoring device abnormal" signal. The distributed control module 300 is connected to the microprocessor 200 and is used to receive one of a "belt normal" signal, a "belt abnormal" signal, a "belt broken" signal, and a "monitoring device abnormal" signal output by the microprocessor 200. Therefore, the condition monitoring system of the present invention can judge the real-time state of the belt 1 of the coal feeder through the monitoring device 100 and output an imaging digital signal based on the state of the belt 1. The monitoring device 100 and the distributed control module 300 are connected through the microprocessor 200. The microprocessor 200 can convert the imaging digital signal of the belt 1 into one of the "belt normal" signal, "belt abnormal" signal, "belt broken" signal, and "monitoring device abnormal" signal, and output it to the distributed control module 300. Therefore, the condition monitoring system of the present invention can realize the automatic start function of the monitoring device 100 to monitor any state of the deviation, damage, tearing or overall breakage of the belt 1 in real time, and can promptly notify the auxiliary operation personnel to judge and handle the fault.

[0055] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0056] In addition, the terms "above" and "below" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "above" and "below" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0057] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0059] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A condition monitoring system, characterized in that: include: A monitoring device is arranged between the belt and the cleaning scraper chain at intervals along the belt extension direction, and is used to emit light to the unloaded section of the belt and output an imaging digital signal; A microprocessor and a distributed control module, wherein the microprocessor is connected to the monitoring device and the distributed control module, and is used to convert the imaging digital signal into one of a "belt normal" signal, a "belt abnormal" signal, a "belt broken" signal, and a "monitoring device abnormal" signal, and transmit the signal to the distributed control module.

2. The condition monitoring system according to claim 1, characterized in that: The monitoring device comprises: a laser scanner for emitting light to an unloaded section of the belt; A photoelectric converter, used for receiving the reflected light from the belt and converting it into an electrical signal; A decoder is used to convert the electrical signal into an imaging digital signal and send the signal to the microprocessor.

3. The condition monitoring system according to claim 1, characterized in that: When the belt is in a normal state, the monitoring device is used to output an imaging digital signal a, and the microprocessor outputs a "belt normal" signal to the distributed control module.

4. The condition monitoring system according to claim 3, characterized in that: When the belt deviates, is damaged or torn, the monitoring device is used to output one of the imaging digital signal b, the imaging digital signal c, and the imaging digital signal d, and the microprocessor outputs a "belt abnormality" signal to the distributed control module.

5. The condition monitoring system according to claim 4, characterized in that: When the belt deviates, the monitoring device is used to output the imaging digital signal b, and the microprocessor outputs the "belt abnormality" signal to the distributed control module.

6. The condition monitoring system according to claim 4, characterized in that: When the belt is damaged or torn, the monitoring device is used to output an imaging digital signal c or an imaging digital signal d, and the microprocessor is used to output the "belt abnormality" signal to the distributed control module.

7. The condition monitoring system according to claim 4, characterized in that: When the belt is broken as a whole, the monitoring device is used to output one of the imaging digital signal b, the imaging digital signal e or the imaging digital signal f, and the microprocessor is used to output a "belt breakage" signal to the distributed control module.

8. The condition monitoring system according to claim 7, characterized in that: When the monitoring device does not output one of the imaging digital signal a, the imaging digital signal b, the imaging digital signal c, the imaging digital signal d, the imaging digital signal e, and the imaging digital signal f, and / or when the microprocessor does not output one of the "belt normal" signal, the "belt abnormal" signal, and the "belt broken" signal, the microprocessor is used to output a "monitoring device abnormal" signal to the distributed control module.

9. The condition monitoring system according to claim 1, characterized in that: When the driving motor of the belt is started, at a first time interval T1, the monitoring device is started and monitors the belt once; Alternatively, when the coal feeder is running and the coal supply is normal, the monitoring device is started after a delay of the second time interval T2, and is started once every third time interval T3, so as to regularly monitor the belt; Alternatively, when the amount of coal on the belt changes suddenly and the gate on the coal feeder is not in the fully closed position, the monitoring device starts after a delay of the fourth time interval T4 and sends a fault processing notification to the auxiliary operation personnel.

10. The condition monitoring system according to claim 9, characterized in that: At the minimum rotation speed of the driving motor, the time required for the belt to run one circle is the fifth time interval T0, and the running time of the monitoring device is greater than or equal to the fifth time interval T0.

Images