A tobacco central dust extraction system and method

Abstract

The application discloses a tobacco centralized dust removal system and method, wherein the system comprises the following: a motor is connected with one end of a fan; the other end of the fan is connected with one end of a negative pressure air duct; the other end of the negative pressure air duct is connected with one end of a dust removal hopper; one end of a dust pipe is connected with the other end of the dust removal hopper; the dust removal hopper is a dust temporary storage device; a crushing device is arranged at the middle lower part of the dust removal hopper; a dust discharging motor is installed below the crushing device, one end of the dust discharging motor is connected with a material falling air lock through a speed reducer; a first material falling port is arranged below the dust discharging motor, one end of the first material falling port is threadedly connected with the material falling air lock, and the other end of the first material falling port is threadedly connected with a pipe; a twisting cage motor is installed on the pipe; the twisting cage is arranged in the pipe, and both ends of the twisting cage are connected with the pipe through bearings; and a second material falling port is arranged below one side of the pipe. The technical content disclosed by the application can effectively avoid that large block sundries are clamped in the dust discharging air lock of the centralized dust removal system, and effectively reduce the shutdown rate of the centralized dust removal system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cigarette making device, more particularly, to a tobacco centralized dust removal system and method. BACKGROUND

[0002] The dust removal system, as an important part of a cigarette factory, plays a vital role in the actual process of cigarette making. The workshop dust removal system mainly collects the production dust of each process in the workshop, and finally the dust is collected by the centralized dust remover and transported to the pressure rod. Each dust remover includes a fan and an ash unloading motor. The centralized dust removal is the starting condition of other dust removers, and when it fails, other dust removers will stop. During production, the centralized dust removal system often gets stuck in large debris in the ash unloading airlock, causing the ash unloading motor to trip due to overcurrent, resulting in the centralized dust removal fan stopping, and further causing the key processes in the workshop, such as cut tobacco and cut stem puffing, to stop. This not only affects the production quality and delays production, but also increases the loss of dry head and dry tail.

[0003] When a fault occurs, maintenance personnel often spend little time to troubleshoot the fault, but the problem of equipment downtime has already been caused.

[0004] Therefore, how to provide a tobacco centralized dust removal system and method has become a technical problem to be solved in the field. SUMMARY

[0005] The purpose of the present application is to provide a tobacco centralized dust removal system and method.

[0006] According to the first aspect of the present application, a tobacco centralized dust removal system is provided, comprising a motor, a fan, a negative pressure air duct, a flange, a dust hopper, a dust duct, a crushing device, an ash unloading motor, a material falling airlock, a cage motor, a first material falling port, a cage, a second material falling port, a support, a duct, and a PLC system.

[0007] The motor is located on the support and connected to one end of the fan to form a dust removal fan. The other end of the fan is connected to one end of the negative pressure air duct through the flange. The other end of the negative pressure air duct is connected to one end of the dust hopper through the flange. One end of the dust duct is connected to the other end of the dust hopper. The dust hopper is a temporary dust storage device. The crushing device is arranged in the middle and lower part of the dust hopper. The ash unloading motor is installed below the crushing device. One end of the ash unloading motor is connected to the material falling airlock through a speed reducer. One end of the material falling airlock is connected to the bearing seat through a bearing. The ash unloading motor and the material falling airlock form an ash unloading device. The first material falling port is arranged below the ash unloading motor. One end of the first material falling port is threadedly connected to the material falling airlock, and the other end is threadedly connected to the duct. The cage motor is installed on the duct. The cage is located inside the duct and connected to the duct through bearings at both ends. The second material falling port is located below one side of the duct.

[0008] The motor, the crushing device, the ash unloading motor and the twisting cage motor are connected with the PLC system respectively.

[0009] Optionally, the crushing device comprises an arc-shaped blade, a threaded part, a transmission shaft, a bearing seat and a crushing motor.

[0010] The arc-shaped blade is integrated with the threaded part, and the threaded part is externally provided with external threads which are screwed on the transmission shaft.

[0011] One end of the transmission shaft is connected with the crushing motor, and the other end is connected with the bearing seat.

[0012] The bearing seat is internally provided with a bearing which is connected with the transmission shaft.

[0013] The crushing motor is connected with the PLC system.

[0014] Optionally, the system further comprises a gas purification and discharge pipeline.

[0015] The gas purification and discharge pipeline is connected with the exhaust end of the fan through a flange.

[0016] Optionally, the system further comprises an observation door.

[0017] The observation door is installed on the dust removal hopper.

[0018] Optionally, the system further comprises a compressed air blowing device, a compressed air pipeline and an electromagnetic valve.

[0019] The compressed air blowing device is installed on the dust removal hopper, and one end thereof is connected with one end of the compressed air pipeline.

[0020] The other end of the compressed air pipeline is connected with one end of the electromagnetic valve.

[0021] The other end of the electromagnetic valve is connected with a compressed air source.

[0022] The compressed air blowing device and the electromagnetic valve are connected with the PLC system.

[0023] Optionally, the system further comprises a differential pressure detection device.

[0024] The differential pressure detection device is installed on the side of the dust removal hopper.

[0025] The differential pressure detection device is connected with the PLC system.

[0026] Optionally, the system further comprises a first belt pulley, a belt and a second belt pulley.

[0027] The first belt pulley is mounted on the cage motor load end bearing, the second belt pulley is mounted on the cage transmission shaft, and the first belt pulley is connected with the second belt pulley through the belt.

[0028] According to the second aspect of the present application, a tobacco centralized dust removal method is provided, comprising the tobacco centralized dust removal system of any one of the first aspect of the present application, the method comprising: a centralized dust removal equipment starting method and a centralized dust removal equipment stopping method.

[0029] The centralized dust removal equipment starting method comprises:

[0030] First, the cage motor is started, then the material crushing motor is started, then the ash discharging motor is started, then the dust removal fan is started after the ash discharging motor is started, and finally the compressed air blowing device is started.

[0031] The dust removal fan is driven to operate by a frequency converter, the material crushing motor and the ash discharging motor are driven in a feeder mode and operate at a frequency of 50 Hz, and the compressed air blowing device blows for 600 milliseconds and is intermittently blown for 5 seconds in a cycle.

[0032] The centralized dust removal equipment stopping method comprises:

[0033] First, the dust removal fan is stopped, then the ash discharging motor is stopped, then the material crushing motor is stopped, then the cage motor is stopped after the material crushing motor is stopped, and finally the compressed air blowing device is stopped.

[0034] Optionally, the method further comprises: an ash discharging motor or screw motor fault operation method.

[0035] The ash discharging motor or screw motor fault operation method comprises:

[0036] If the ash discharging motor or screw motor fails and the dust removal fan normally operates, the dust removal hopper is used as a dust temporary storage device, the centralized dust removal system does not stop, continues to operate for a predefined time, a PLC system performs real-time blockage alarm, and a timer starts timing; if the ash discharging motor or screw motor is repaired within the predefined time, the blockage alarm is eliminated, otherwise the dust removal fan stops.

[0037] According to the disclosed technical content, the following beneficial effects are achieved: the centralized dust removal system can effectively avoid the blockage of large pieces of sundries in the ash discharging air lock, thereby causing the overcurrent tripping of the ash discharging motor and the stop of the centralized dust removal fan, and further causing the stop of the key process in the workshop. The centralized dust removal system can effectively reduce the downtime, improve the equipment operation efficiency and production continuity, ensure the product quality of the cut tobacco line, and reduce the labor intensity of maintenance personnel.

[0038] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments thereof, which description should be taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0039] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0040] Figure 1 A schematic diagram of a tobacco centralized dust removal system according to an embodiment;

[0041] Figure 2 A flow chart of a method for operating a dust discharging motor or screw motor according to an embodiment.

[0042] BRIEF DESCRIPTION OF DRAWINGS: 1 - motor, 2 - fan, 3 - gas purification discharge pipeline, 4 - negative pressure air pipeline, 5 - flange, 6 - dust removal hopper, 7 - dust pipeline, 8 - observation door, 9 - compressed air blowing device, 10 - compressed air pipeline, 11 - electromagnetic valve, 12 - arc-shaped blade, 13 - threaded portion, 14 - transmission shaft, 15 - bearing seat, 16 - differential pressure detection device, 17 - crushing motor, 18 - dust discharging motor, 19 - blanking air lock, 20 - twisting cage motor, 21 - first belt pulley, 22 - belt, 23 - second belt pulley, 24 - first blanking port, 25 - twisting cage, 26 - second blanking port, 27 - support, 28 - pipeline. DETAILED DESCRIPTION

[0043] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangements, numerical expressions, and values of components and steps set forth in these embodiments are not limiting to the scope of the present application unless otherwise specifically stated.

[0044] The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the scope of the application its application or uses.

[0045] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail herein. However, where appropriate, such techniques, methods, and apparatus should be considered as being part of the specification.

[0046] In all of the examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as a limitation on the scope of the exemplary embodiments. Thus, other examples of the exemplary embodiments can have different values.

[0047] It should be noted that like numerals and letters refer to like items throughout the drawings, and as a result, once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0048] According to a first aspect of the present application, as Figure 1As shown, a tobacco centralized dust removal system is provided, comprising a motor 1, a fan 2, a negative pressure air duct 4, a flange 5, a dust removal hopper 6, a dust pipe 7, a crushing device, a dust discharging motor 18, a material falling air lock 19, a twisting cage motor 20, a first material falling port 24, a twisting cage 25, a second material falling port 26, a support 27, a pipe 28 and a PLC system;

[0049] The motor 1 is located on the support 27 and connected with one end of the fan 2 to form a dust removal fan; the other end of the fan 2 is connected with one end of the negative pressure air duct 4 through the flange 5; the other end of the negative pressure air duct 4 is connected with one end of the dust removal hopper 6 through the flange 5; one end of the dust pipe 7 is connected with the other end of the dust removal hopper 6, and the other end is connected with other dust removal devices; the dust removal hopper 6 is a dust temporary storage device; the crushing device is arranged in the middle and lower part of the dust removal hopper 6; the dust discharging motor 18 is installed below the crushing device, one end of the dust discharging motor 18 is connected with the material falling air lock 19 through a speed reducer, one end of the material falling air lock 19 is connected with a bearing seat through a bearing, and the dust discharging motor 18 and the material falling air lock 19 form a dust discharging device; the first material falling port 24 is arranged below the dust discharging motor 18, and the first material falling port 24 is a tubular structure with a horn shape; one end of the first material falling port 24, i.e. the small opening end of the horn, is threadedly connected with the material falling air lock 19, and the other end of the first material falling port 24, i.e. the large opening end of the horn, is threadedly connected with the pipe 28; the twisting cage motor 20 is installed on the pipe 28; the twisting cage 25 is located inside the pipe 28, and both ends of the twisting cage 25 are connected with the pipe 28 through bearings; the second material falling port 26 is located below one side of the pipe 28;

[0050] The motor 1, the crushing device, the dust discharging motor 18 and the twisting cage motor 20 are connected with the PLC system respectively.

[0051] In some embodiments, the crushing device comprises an arc-shaped blade 12, a threaded part 13, a transmission shaft 14, a bearing seat 15 and a crushing motor 17.

[0052] The arc-shaped blade 12 and the threaded part 13 are integrated, the threaded part is externally provided with external threads, and the threaded part 13 is screwed on the transmission shaft 14 through the external threads thereon;

[0053] One end of the transmission shaft 14 is connected with the crushing motor 17, and the other end of the transmission shaft 14 is connected with the bearing seat 15;

[0054] The bearing seat 15 is internally provided with a bearing, and the bearing is connected with the transmission shaft 14;

[0055] The crushing motor 17 is connected with the PLC system.

[0056] The system further comprises a gas purification and discharge pipe 3.

[0057] The gas purification discharge pipeline 3 is connected with the exhaust end of the fan 2 through a flange 5.

[0058] The system further comprises an observation door 8.

[0059] The observation door 8 is installed on the dust removal hopper 6.

[0060] The system further comprises a compressed air injection device 9, a compressed air pipeline 10 and a solenoid valve 11.

[0061] The compressed air injection device 9 is installed on the dust removal hopper 6, and one end thereof is connected with one end of the compressed air pipeline 10.

[0062] The other end of the compressed air pipeline 10 is connected with one end of the solenoid valve 11.

[0063] The other end of the solenoid valve 11 is connected with a compressed air source.

[0064] The compressed air injection device 9 and the solenoid valve 11 are connected with a PLC system.

[0065] The system further comprises a differential pressure detection device 16.

[0066] The differential pressure detection device 16 is installed on the side of the dust removal hopper 6.

[0067] The differential pressure detection device 16 is connected with the PLC system.

[0068] The system further comprises a first belt pulley 21, a belt 22 and a second belt pulley 23.

[0069] The first belt pulley 21 is installed on the load end bearing of the winch motor 20, the second belt pulley 23 is installed on the winch transmission shaft, and the first belt pulley 21 is connected with the second belt pulley 23 through the belt 22.

[0070] Specifically, the motor 1 is located on the support 27, the frequency converter is driven to operate, and is connected with the fan 2, the motor 1 and the fan 2 form a dust removal fan; the gas purification and discharge pipeline 3 discharges the gas in the pipeline to the atmosphere after purification; the negative pressure air pipeline 4 generates negative pressure air by the operation of the dust removal fan, so that negative pressure air is generated in the whole dust removal device, and the dust in other dust collectors is sucked into the dust hopper 6; the flange 5 is used for connecting the negative pressure air pipeline 4 and the dust hopper 6; the dust hopper 6 is used for a dust temporary storage device; the dust pipeline 7 is used as an entrance of the dust of other dust collectors; the observation door 8 is used for normal production and maintenance; the compressed air blowing device 9 is installed on the dust hopper, one end of the compressed air blowing device 9 is connected with the compressed air pipeline 10, during production, intermittent and cyclic blowing is carried out, so that the dust is prevented from accumulating on the inner wall of the dust hopper for a long time; the compressed air pipeline 10 is used for compressed air conveying; the electromagnetic valve 11 is used for controlling the opening and closing of the compressed air; the arc-shaped blade 12 and the threaded part 13 are integrated, the threaded part 13 is screwed on the transmission shaft 14, one end of the transmission shaft 14 is connected with the crushing motor 17, the other end of the transmission shaft 14 is connected with the bearing seat 15 through a bearing, and the arc-shaped blade 12, the threaded part 13, the transmission shaft 14, the bearing seat 15 and the crushing motor 17 form a crushing device, the crushing motor 17 is rotated to drive the transmission shaft to rotate, the dust falling from the dust hopper 6 is crushed, and large pieces of sundries are prevented from falling into the next stage equipment; the differential pressure detection device 16 is installed on the side of the dust hopper 6, and is used for detecting whether the pressure difference of the dust collector is normal; one end of the material falling air lock 19 is directly connected with the dust discharging motor 18 through a speed reducer, the other end of the material falling air lock 19 is connected with the bearing seat through a bearing, the dust discharging motor 18 and the material falling air lock 19 form a dust discharging device, the dust discharging motor 18 is operated to drive the material falling air lock 19 to rotate, and the dust crushed by the crushing device is conveyed into the pipeline 28; the twisting cage motor 20 is installed on the pipeline 28, the first belt pulley 21 is installed on the load end shaft of the twisting cage motor 20, the second belt pulley 23 is installed on the twisting cage transmission shaft, and the belt 22 is used for connecting the first belt pulley 21 and the second belt pulley 23; one end of the first material falling port 24 is threadedly connected with the material falling air lock 19, the other end of the first material falling port 24 is threadedly connected with the pipeline 28, and the first material falling port 24 is used as a falling inlet of the dust falling from the material falling air lock 19; the twisting cage 25 is located in the pipeline 28, and both ends of the twisting cage 25 are connected with the pipeline 28 through bearings, the twisting cage motor 20 is operated to drive the twisting cage 25 to rotate, and the dust falling from the first material falling port 24 is conveyed to the second material falling port 26; the second material falling port 26 is located below one side of the pipeline 28, and the future dust is conveyed to a rod pressing process to be subjected to rod pressing treatment; the support 27 is made of stainless steel, is located on the ground, and is used for supporting the motor 1; the pipeline 28 is located on the ground; the second material falling port 26 is connected with a rod pressing dust pipeline.

[0071] According to the second aspect of the present application, a tobacco centralized dust removal method is provided, which comprises the tobacco centralized dust removal system in any one of the embodiments, and the method comprises:

[0072] A centralized dust removal equipment starting method and a centralized dust removal equipment stopping method.

[0073] The centralized dust removal equipment starting method comprises:

[0074] First, the cage motor 20 is started, then the crushing motor 17 is started, and then the ash removal motor 18 is started. After the ash removal motor 18 is started, the dust removal fan is started, and finally the compressed air blowing device 9 is started.

[0075] The dust removal fan is driven to run by a frequency converter. The crushing motor 17 and the ash removal motor 18 are driven in a feeder mode and run at a frequency value of 50 Hz. The compressed air blowing device 9 blows for 600 milliseconds, intermittently for 5 seconds, and cyclically blows.

[0076] Specifically, the fan 2 is started to generate negative pressure wind, and the dust is sucked into the dust removal hopper 6 by the negative pressure wind. The dust in the dust removal hopper 6 falls and first passes through the crushing device for crushing treatment to prevent large impurities from being stuck in the material falling air lock 19, causing the ash removal motor 18 to trip due to overcurrent and causing the centralized dust removal fan to stop. The crushed dust enters the material falling air lock 19, falls into the pipeline 28 as the material falling air lock 19 rotates, and enters the rod pressing process through the second material falling port 26 in the pipeline 28 for rod pressing treatment. During the operation of the centralized dust removal system, the dust removal fan is driven to run by a frequency converter at a set frequency value. The crushing motor 17 and the ash removal motor 18 are driven in a feeder mode and run at a frequency value of 50 Hz. The compressed air blowing device 9 blows for 600 milliseconds, intermittently for 5 seconds, and cyclically blows to prevent dust in the dust removal hopper from adhering to the inner wall of the dust removal hopper and forming hard blocks that are difficult to clean. The differential pressure blowing alarm point monitoring function is used to detect whether the differential pressure of the dust remover is normal.

[0077] The centralized dust removal equipment stopping method comprises:

[0078] First, the dust removal fan is stopped, then the ash removal motor 18 is stopped, then the crushing motor 17 is stopped, then the cage motor 20 is stopped, and finally the compressed air blowing device 9 is stopped.

[0079] In some embodiments, as shown in Figure 2 The method further comprises an ash removal motor or spiral motor failure operation method.

[0080] The ash removal motor and spiral motor failure operation method comprises:

[0081] If the ash discharging motor 18 or the screw motor fails, the dust removal hopper 6 is used as a temporary dust storage device, the dust removal system continues to run for a predefined time without stopping, the PLC system performs real-time blockage alarm, and relevant personnel receive the alarm information to repair the fault immediately, and the timer starts counting; if the ash discharging motor 18 or the screw motor is repaired within the predefined time, the blockage alarm is eliminated, otherwise the dust removal fan stops.

[0082] Specifically, the storage capacity of the dust removal hopper 6 is also within a certain range, and it is impossible to load an unlimited amount of dust. When the dust reaches a certain amount, the dust removal hopper will also be blocked. In order to prevent the above situation from occurring, a dust removal hopper timing function is designed, and maintenance personnel can perform maintenance within the predefined time. When the timing time is reached, the dust removal fan will stop running. The specific measures are to use the existing timer module in the WICC database, add a timer counting function to the centralized monitoring interface, generate an alarm when the dust is blocked, and start counting and display when the PLC receives the signal. When the alarm is eliminated, the timer resets and hides.

[0083] In summary, the technical content disclosed in the application can effectively avoid the centralized dust removal system from being blocked by large pieces of debris in the ash discharging air lock, thereby causing the ash discharging motor to trip due to overcurrent, causing the centralized dust removal fan to stop, and further causing the key process in the workshop to stop and the material to be interrupted. The centralized dust removal system effectively reduces the downtime, improves the efficiency of the equipment and the continuity of production, ensures the quality of the cut tobacco line, and reduces the labor intensity of the maintenance personnel.

[0084] Although some specific embodiments of the application have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration and are not intended to limit the scope of the application. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the application. The scope of the application is defined by the appended claims.

Claims

1. A tobacco central dust extraction system characterised in that, The system comprises a motor, a fan, a negative pressure air duct, a flange, a dust removal hopper, a dust pipe, a crushing device, a dust discharging motor, a material falling air lock, a twisting cage motor, a first material falling port, a twisting cage, a second material falling port, a support, a pipe and a PLC system. The motor is located on the support and connected with one end of the fan to form a dust removal fan. The other end of the fan is connected with one end of the negative pressure air duct through the flange. The other end of the negative pressure air duct is connected with one end of the dust removal hopper through the flange. One end of the dust pipe is connected with the other end of the dust removal hopper. The dust removal hopper is a dust temporary storage device. The crushing device is arranged in the middle and lower part of the dust removal hopper. The dust discharging motor is installed below the crushing device. One end of the dust discharging motor is connected with the material falling air lock through a speed reducer. One end of the material falling air lock is connected with a bearing seat through a bearing. The dust discharging motor and the material falling air lock form a dust discharging device. The first material falling port is arranged below the dust discharging motor. One end of the first material falling port is threadedly connected with the material falling air lock. The other end of the first material falling port is threadedly connected with the pipe. The twisting cage motor is installed on the pipe. The twisting cage is located inside the pipe. Both ends of the twisting cage are connected with the pipe through bearings. The second material falling port is located below one side of the pipe. The motor, the crushing device, the dust discharging motor and the twisting cage motor are connected with the PLC system. The crushing device comprises an arc-shaped blade, a threaded part, a transmission shaft, a bearing seat and a crushing motor. The arc-shaped blade and the threaded part are integrated. An external thread is arranged on the outer part of the threaded part. The threaded part is screwed on the transmission shaft through the external thread.

2. A method of tobacco bulk de-dusting, characterized in that, One end of the transmission shaft is connected with the crushing motor. The other end of the transmission shaft is connected with the bearing seat. A bearing is installed in the bearing seat. The crushing motor is connected with the PLC system. The system further comprises a gas purification and discharge pipe. The gas purification and discharge pipe is connected with the exhaust end of the fan through the flange. The system further comprises an observation door. The observation door is installed on the dust removal hopper. The system further comprises a compressed air blowing device, a compressed air pipeline and an electromagnetic valve. The compressed air blowing device is installed on the dust removal hopper. One end of the compressed air blowing device is connected with one end of the compressed air pipeline. The other end of the compressed air pipeline is connected with one end of the electromagnetic valve. The other end of the electromagnetic valve is connected with a compressed air source. The compressed air blowing device and the electromagnetic valve are connected with the PLC system. The system further comprises a differential pressure detection device. The differential pressure detection device is installed on the side of the dust removal hopper. The differential pressure detection device is connected with the PLC system. The system further comprises a first belt pulley, a belt and a second belt pulley. The first belt pulley is installed on the load end bearing of the twisting cage motor. The second belt pulley is installed on the transmission shaft of the twisting cage. The first belt pulley is connected with the second belt pulley through the belt. The system comprises the tobacco centralized dust removal system of claim 1. The method comprises a centralized dust removal equipment starting method and a centralized dust removal equipment stopping method. The centralized dust removal equipment starting method comprises the following steps. First, the twisting cage motor is started. Then, the crushing motor is started. Then, the dust discharging motor is started. After the dust discharging motor is started, the dust removal fan is started. Finally, the compressed air blowing device is started. The dust removal fan is driven by a frequency converter to run; the crushing motor and the ash discharging motor are driven by a feeder to run at a frequency of 50 Hz; the air pressure blowing device blows for 600 milliseconds, and is intermittently stopped for 5 seconds, and is cyclically blown; The centralized dust removal equipment stopping method comprises: First, the dust removal fan is stopped, then the ash discharging motor is stopped, then the crushing motor is stopped, then the twisting cage motor is stopped, and finally the air pressure blowing device is stopped; The method further comprises an ash discharging motor or screw motor fault operation method; The ash discharging motor or screw motor fault operation method comprises: If the dust removal fan is normally operated when the ash discharging motor or screw motor fails, the dust removal hopper is used as a dust temporary storage device, the centralized dust removal system is not stopped, and continues to run for a predefined time, a PLC system performs real-time blockage alarm, and a timer starts timing; if the ash discharging motor or screw motor is repaired within the predefined time, the blockage alarm is eliminated, otherwise the dust removal fan is stopped.

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