Automatic anti-blocking system suitable for pulverized coal bunker

Abstract

The invention provides an automatic anti-blocking system suitable for a pulverized coal bunker, which comprises the pulverized coal bunker, and further comprises two rotating frames which are rotatably mounted at the top and the bottom of the pulverized coal bunker respectively and are arranged in parallel; the two ends of each stirring rod are rotationally installed on the two rotating frames correspondingly, and at least two stirring rods are obliquely arranged with the included angle being an acute angle relative to the rotating axis of the rotating frames; the spiral structure is spirally wound on the periphery of the stirring rod and is used for stirring the pulverized coal; the elastic coupling is used for connecting the stirring rod and the rotating frame; and the driving mechanism is used for driving the stirring rod to rotate and revolve. According to the pulverized coal bunker, pulverized coal can be homogenized, a cavity existing when the pulverized coal is accumulated is eliminated, the situation that equipment is damaged due to excessive vibration is avoided while pulverized coal blockage is prevented, the overall performance of the pulverized coal bunker can be improved, and contribution can be made to safe production, energy conservation and emission reduction of enterprises.

Description

Technical Field

[0001] The present application relates to the technical field of coal storage equipment, and in particular to an automatic anti-blocking system suitable for a coal powder bin. Background Art

[0002] In the industrial production of thermal power plants, pulverized coal bins are widely used to store and transport pulverized coal and other fuels. However, during the long-term storage of pulverized coal, affected by the air humidity in the pulverized coal bin, the water content of the pulverized coal itself, and the interaction between the pulverized coal particles, the pulverized coal often adheres to the inner wall or even agglomerates, resulting in blockage of the pulverized coal bin and affecting the normal operation of the fuel supply system.

[0003] At present, solving the adhesion and blockage problems of coal powder bins in thermal power plants often relies on manual cleaning, which consumes a lot of time and human resources. Although conventional mechanical vibration can solve the agglomeration problem to a certain extent, excessive vibration may cause damage to the equipment.

[0004] In view of this, it is necessary to design an automated anti-blocking system for coal powder silos to eliminate the cavities present when coal powder is accumulated, to homogenize the coal powder, to ensure the stability and continuity of coal powder supply, and to avoid damage to the equipment caused by excessive vibration. Summary of the invention

[0005] In order to make the coal powder uniform and eliminate the cavities existing when the coal powder is piled up, the present application provides an automatic anti-blocking system suitable for the coal powder bin.

[0006] The present application provides an automatic anti-blocking system for coal powder silo, which adopts the following technical solutions: An automatic anti-blocking system for a pulverized coal bunker, comprising a pulverized coal bunker, and further comprising: Two rotating racks are provided and are rotatably mounted on the top and bottom of the pulverized coal bin respectively, and the two rotating racks are arranged in parallel; A plurality of stirring rods are provided, and both ends are rotatably mounted on the two rotating frames, and at least two stirring rods are arranged in an inclined state with an acute angle to the rotation axis of the rotating frame; A spiral structure, spirally wound around the outer circumference of the stirring rod, for stirring the coal powder; an elastic coupling, used to connect the stirring rod and the rotating frame; and The driving mechanism is used to drive the stirring rod to rotate and revolve.

[0007] Furthermore, among the plurality of stirring rods, one stirring rod is arranged along the rotation axis of the rotating frame, and the other stirring rods are arranged at an inclination.

[0008] Furthermore, the plurality of stirring rods are all arranged at an angle and are spatially enclosed to form a polygonal pyramid shape.

[0009] Furthermore, the angles between the plurality of inclined stirring rods and the rotation axis of the rotating frame are different from each other or different from each other.

[0010] Furthermore, the spiral structure is configured as a spiral groove or a spiral blade.

[0011] Furthermore, a speed sensor for monitoring the rotation speed of the stirring rod is arranged on the rotating frame, a material level sensor is arranged in the pulverized coal bin, and a pressure sensor is arranged at the bottom, and the speed sensor, the material level sensor and the pressure sensor are connected to a PLC automatic control device, and the PLC automatic control device is connected to the driving mechanism; The PLC automatic control device is used to receive the signals output by the speed sensor, the material level sensor and the pressure sensor, and output a control signal to the driving mechanism.

[0012] Furthermore, the PLC automatic control device is configured as follows: When the pressure sensor detects that the pressure in the pulverized coal bin exceeds a set value, the driving mechanism is controlled to start so as to drive the stirring rod to rotate; When the pressure sensor detects that the pressure in the pulverized coal bin drops below a set value, the driving mechanism is controlled to stop working.

[0013] Furthermore, the PLC automatic control device is also configured as follows: When the pressure sensor detects that the pressure in the pulverized coal bin increases and the material level sensor detects that the material level in the pulverized coal bin increases, controlling the driving mechanism to increase the rotation speed of the stirring rod; When the pressure sensor detects that the pressure in the pulverized coal bin decreases and the material level sensor detects that the material level in the pulverized coal bin decreases, the driving mechanism is controlled to reduce the rotation speed of the stirring rod.

[0014] Furthermore, the PLC automatic control device is also configured as follows: When the pressure sensor detects that the pressure in the coal powder bin continues to increase and the material level sensor detects that the material level in the coal powder bin remains unchanged for a long time, the emergency anti-blocking mode is entered, and the driving mechanism is controlled to adjust the rotation speed of the stirring rod to the maximum value; And after entering the emergency anti-blocking mode for a certain period of time, if the pressure sensor detects that the pressure in the coal powder bin decreases, the emergency anti-blocking mode is exited; if the pressure sensor detects that the pressure in the coal powder bin has no downward trend, an alarm signal is output to notify the operator to handle it.

[0015] Furthermore, the driving mechanism is configured as a main driving motor installed outside the pulverized coal bin and an auxiliary driving motor installed on the rotating frame, the main driving motor is used to drive the rotating frame to rotate, and the auxiliary driving motor is provided in plurality and is respectively used to drive the plurality of stirring rods to rotate in a one-to-one correspondence; Alternatively, the driving mechanism is configured as a power motor installed outside the pulverized coal bin, a sun gear is coaxially fixed to the output end of the power motor, an inner ring gear is fixed to the rotating frame, a plurality of planetary gears are meshingly connected between the sun gear and the inner ring gear, and the plurality of stirring rods are respectively installed on the sun gear and / or the plurality of planetary gears.

[0016] In summary, the present application includes at least one of the following beneficial technical effects: 1. By arranging a plurality of stirring rods between two rotating frames to form a rotating system, the driving mechanism drives the stirring rod to rotate and revolve simultaneously, so that the stirring rod can fully disturb the coal powder with the help of the spiral structure on it during the rotation and revolution process, which can promote the homogenization of the coal powder in the coal powder bin; 2. Arranging at least two stirring rods to be inclined at an acute angle to the rotation axis of the rotating frame can reduce the flow resistance of the coal powder, increase the sliding speed of the coal powder on the stirring rod, thereby optimizing the flow state of the coal powder, thereby reducing blockage and powder accumulation, and ensuring continuous and stable transportation of the coal powder; 3. The inclined stirring rod can reduce the shear force of coal powder during flow, reduce the wear of coal powder on the stirring rod and the inner wall of the coal powder bin, effectively reduce local accumulation and dead corners, and improve the utilization rate of the bin; in addition, it can also improve the ventilation conditions of the coal powder bin, help to reduce the temperature in the bin, and reduce the risk of coal powder spontaneous combustion and explosion; 4. The inclined stirring rod can improve the fluidity of coal powder, especially for coal powder with high viscosity. Gravity can help prevent coal powder from forming stubborn accumulation on the stirring rod, which is convenient for later cleaning and maintenance. At the same time, the inclined stirring rod can better adapt to the spatial layout of the coal powder bin, especially in occasions where space is limited or special angles are required for transportation. Therefore, through the above settings, not only can the coal powder be homogenized and the cavity existing when the coal powder is accumulated be eliminated, which helps to improve the overall performance of the coal powder bin, but also contributes to the enterprise's safe production and energy conservation and emission reduction; 5. By setting up speed sensors, level sensors and pressure sensors and connecting them with the PLC automatic control device, the speed of the rotating system can be adjusted in real time according to the storage capacity of the coal powder bin to achieve closed-loop control, so that the coal powder follows the movement to change the coal powder accumulation state, which not only achieves uniform distribution of coal powder and eliminates the cavities existing when coal powder is accumulated, but also avoids equipment damage caused by excessive vibration, thereby greatly improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application; Figure 2 is a top view of a plurality of stirring rods in an embodiment of the present application when the plurality of stirring rods are coplanar; Figure 3 is a top view of a plurality of stirring rods in an embodiment of the present application when all of them are arranged at an inclination; Figure 4 This is a schematic diagram of the overall structure of an embodiment of the present application when the angles of the inclined stirring rod are different.

[0019] Reference numerals: 1. Pulverized coal silo; 3. Rotating frame; 31. Elastic coupling; 4. Stirring rod; 41. Spiral structure; 51. Speed ​​sensor; 52. Material level sensor; 53. Pressure sensor; 61. Main drive motor; 61. Auxiliary drive motor; 7. PLC automatic control device. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not 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.

[0021] Reference Figure 1 and Figure 2 The embodiment of the present application discloses an automatic anti-blocking system applicable to a pulverized coal bin, which includes a pulverized coal bin 1 and further includes: There are two rotating frames 3 which are rotatably mounted on the top and bottom of the coal powder bin 1 respectively, and the two rotating frames 3 are arranged in parallel.

[0022] There are multiple stirring rods 4, and both ends are rotatably mounted on the two rotating frames 3 respectively. At least two stirring rods 4 are inclined with the rotating axis of the rotating frame 3 at an acute angle.

[0023] The spiral structure 41 is spirally wound around the outer periphery of the stirring rod 4 and is used to stir the coal powder. In a specific implementation, the spiral structure 41 is set as a spiral groove or a spiral blade. The spiral groove can be used as a channel for the flow of coal powder, and the spiral blade intensifies the transportation of coal powder in the coal powder bin 1. Moreover, in order to adapt to the structural setting of the upper straight section and the lower conical section of the coal powder bin 1, the radial width of the spiral blade in the stirring rod 4 can tend to decrease from top to bottom. However, the radial width of the spiral blade in the stirring rod 4 should not be set too large to avoid affecting the normal up and down flow of coal powder when the stirring rod 4 is not rotating.

[0024] The elastic coupling 31 is used to connect the stirring rod 4 and the rotating frame 3. If the elastic coupling 31 is used to connect the inclined stirring rod 4, a universal joint needs to be installed to ensure the normal rotation of the inclined stirring rod 4. The driving mechanism is used to drive the stirring rod 4 to rotate and revolve. The rotation of the stirring rod 4 is based on the axis of the stirring rod 4 itself, and the revolution of the stirring rod is based on the axis of the rotating frame 3.

[0025] In this way, a rotating system is formed by arranging a plurality of stirring rods 4 between the two rotating frames 3, so that the driving mechanism drives the stirring rod to rotate while also driving it to revolve, so that the stirring rod can fully disturb the coal powder with the help of the spiral structure 41 thereon during the rotation and revolution; and at least two stirring rods 4 are arranged to be inclined at an acute angle to the rotation axis of the rotating frame 3, which can reduce the flow resistance of the coal powder, increase the sliding speed of the coal powder on the stirring rod 4, thereby optimizing the flow state of the coal powder, thereby reducing blockage and powder accumulation, and ensuring continuous and stable transportation of the coal powder; and the inclined stirring rod 4 can reduce the shear force of the coal powder during flow, reduce the wear of the coal powder on the stirring rod 4 and the inner wall of the coal powder bin 1, can effectively reduce local accumulation and dead corners, and improve the utilization rate of the bin capacity; in addition, it can also improve the ventilation conditions of the coal powder bin 1, help reduce the temperature in the bin, and reduce the risk of spontaneous combustion and explosion of coal powder.

[0026] In addition, the inclined stirring rod 4 can improve the fluidity of the coal powder, especially for the coal powder with high viscosity, which can help prevent the coal powder from forming stubborn accumulation on the stirring rod 4 through the action of gravity, and facilitate the later cleaning and maintenance; at the same time, the inclined stirring rod 4 can better adapt to the spatial layout of the coal powder bin 1, especially in the occasions where the space is limited or special angle transportation is required, this arrangement is more advantageous. Therefore, through the above arrangement, not only the coal powder is homogenized, the cavity existing when the coal powder is accumulated is eliminated, which helps to improve the overall performance of the coal powder bin 1, but also contributes to the safe production and energy conservation and emission reduction of the enterprise.

[0027] Furthermore, in order to improve the stirring effect of the plurality of stirring rods 4 on the coal powder during revolution and rotation.

[0028] In one embodiment, referring to Figure 1 and Figure 2 Among the multiple stirring rods 4, one stirring rod 4 is arranged along the rotation axis of the rotating frame 3, and the other stirring rods 4 are arranged at an angle; and the other stirring rods 4 can be arranged coplanarly with the stirring rod 4 located in the middle, or can be arranged in different planes. In this embodiment, taking the arrangement of three stirring rods 4 as an example, the other two stirring rods 4 are arranged on both sides of the stirring rod 4 in the middle. In this way, when the stirring rod 4 rotates, the coal powder attached to the side of the stirring rod 4 can be transported; and when the stirring rod 4 revolves, the coal powder is stirred, which can greatly promote the overall flow of the coal powder in the coal powder bin 1.

[0029] In another embodiment, referring to Figure 1 and Figure 3 The plurality of stirring rods 4 are all inclined and enclosed in a polygonal pyramid shape in space. Therefore, when the stirring rods 4 rotate and revolve, the coal powder in the coal powder bin 1 can be effectively flow-promoted and stirred in space.

[0030] In other embodiments, reference Figure 4 It can also be further arranged that the angles between the plurality of inclined stirring rods 4 and the rotation axis of the rotating frame 3 are different or different in pairs. In this way, no matter which of the above embodiments is used, the trajectories of the plurality of stirring rods 4 when they are revolving can be different, which can further promote the stirring effect of the coal powder.

[0031] In order to dynamically adjust the disturbance effect of the stirring rod 4 in real time according to the material level height and pressure changes in the pulverized coal bin 1.

[0032] Reference Figure 1 A speed sensor 51 for monitoring the rotation speed of the stirring rod 4 is arranged on the rotating frame 3, a level sensor 52 is arranged in the coal powder bin 11, and a pressure sensor 53 is arranged at the bottom. The speed sensor 51, the level sensor 52 and the pressure sensor 53 are commonly connected to a PLC automatic control device 7, and the PLC automatic control device 7 is connected to the driving mechanism.

[0033] The PLC automatic control device 7 is used to receive signals output by the speed sensor 51, the level sensor 52 and the pressure sensor 53, and output control signals to the driving mechanism; wherein the speed sensor 51 is used to realize the closed-loop control of the PLC automatic control device 7; the level sensor 52 is used to monitor the level height in the pulverized coal bin 1, as an auxiliary control parameter of the PLC automatic control device 7; the pressure sensor 53 is used to monitor the pressure changes in the pulverized coal bin 1 in real time, as the main control parameter of the PLC automatic control device 7.

[0034] Specifically, the PLC automatic control device 7 is configured as follows: When the pressure sensor 53 detects that the pressure in the coal powder bin 1 exceeds the set value, the control driving mechanism is started to drive the stirring rod 4 to rotate; When the pressure sensor 53 detects that the pressure in the coal powder bin 1 drops below the set value, the driving mechanism is controlled to stop working. With this control logic, the start and stop control of the aforementioned rotating system can be realized.

[0035] The PLC automatic control device 7 is also configured as follows: When the pressure sensor 53 detects that the pressure in the coal powder bin 1 increases and the material level sensor 52 detects that the material level in the coal powder bin 1 increases, the driving mechanism is controlled to increase the rotation speed of the stirring rod 4; When the pressure sensor 53 detects that the pressure in the coal powder bin 1 decreases and the material level sensor 52 detects that the material level in the coal powder bin 1 decreases, the driving mechanism is controlled to reduce the rotation speed of the stirring rod 4. With this control logic, the speed regulation control of the rotating system can be realized. Among them, the upper and lower limits of the rotation speed of the stirring rod 4 need to be set to prevent the driving mechanism from overloading.

[0036] In addition, the PLC automatic control device 7 is also configured as: When the pressure sensor 53 detects that the pressure in the coal powder bin 1 continues to rise and the material level sensor 52 detects that the material level in the coal powder bin 1 remains unchanged for a long time, the emergency anti-blocking mode is entered, and the driving mechanism is controlled to adjust the rotation speed of the stirring rod 4 to the maximum value; And after entering the emergency anti-blocking mode for a certain period of time, if the pressure sensor 53 detects that the pressure in the coal powder bin 1 decreases, the emergency anti-blocking mode is exited; if the pressure sensor 53 detects that the pressure in the coal powder bin 1 has no downward trend, an alarm signal is output to notify the operator to handle it. This control logic can realize the anti-blocking control of the rotating system.

[0037] Moreover, during the specific operation, the PLC automatic control device 7 performs the following process: S1. Initialization: setting parameters, sensor zeroing, etc. S2, parameter detection: real-time reading of pressure, material level, speed and other parameters; S3, control logic: execute corresponding control strategies according to parameter changes; S4, closed-loop regulation: using PID algorithm to perform closed-loop regulation on the rotation speed of the rotating system; S5. Alarm processing: When an abnormal situation occurs, an alarm signal is issued and the fault information is recorded.

[0038] Therefore, the rotation speed of the rotating system is adjusted in real time according to the storage capacity of the coal powder bin 1 to realize closed-loop control, so that the coal powder follows the movement to change the coal powder accumulation state, which not only realizes the uniform distribution of coal powder and eliminates the cavities existing when coal powder is accumulated, but also avoids equipment damage caused by excessive vibration, thereby greatly improving production efficiency.

[0039] In addition, to achieve efficient rotation of the rotating system.

[0040] In one embodiment, the driving mechanism is configured as a main driving motor 61 installed outside the pulverized coal bin and an auxiliary driving motor 61 installed on the rotating frame 3. The main driving motor 61 is used to drive the rotating frame 3 to rotate, and the auxiliary driving motor 61 is provided in plurality and is respectively used to drive the plurality of stirring rods 4 to rotate one by one. The rotating frame 3 and the stirring rod 4 are independently controlled by the main driving motor 61 and the auxiliary driving motor 61, and the rotation speeds of the two can be independently adjusted to meet the special needs in actual production.

[0041] In another embodiment, the driving mechanism is set as a power motor installed outside the pulverized coal bin, the output end of the power motor is coaxially fixed with a sun gear, an inner gear ring is fixed on the rotating frame 3, a plurality of planetary gears are meshed and connected between the sun gear and the inner gear ring, a plurality of stirring rods 4 are respectively installed on the sun gear and / or a plurality of planetary gears, and the sun gear and the planetary gears are installed on the inner gear ring through the planetary frame to form a planetary gear train. Thus, by setting a power motor, the synchronous rotation and revolution of a plurality of stirring rods 4 can be realized, and its compact structure and small size are suitable for the arrangement of the pulverized coal bin 1.

[0042] In this embodiment, the configuration of the main drive motor 61 and the auxiliary drive motor 61 is selected to demonstrate the structural principle of the present application. Figure 1 However, this does not limit the present embodiment.

[0043] The implementation principle of an automatic anti-blocking system applicable to a coal powder silo in the embodiment of the present application is as follows: A rotating system is formed by arranging a plurality of stirring rods 4 between the two rotating frames 3, so that the driving mechanism drives the stirring rod to rotate and revolve at the same time, so that the stirring rod can fully disturb the coal powder with the help of the spiral structure 41 thereon during the rotation and revolution, which can promote the homogenization of the coal powder in the coal powder bin 1; and at least two stirring rods 4 are arranged to be inclined at an acute angle to the rotation axis of the rotating frame 3, which can reduce the flow resistance of the coal powder, increase the sliding speed of the coal powder on the stirring rod 4, thereby optimizing the flow state of the coal powder, thereby reducing blockage and powder accumulation, and ensuring continuous and stable transportation of the coal powder; and the inclined stirring rod 4 can reduce the shear force of the coal powder during flow, reduce the wear of the coal powder on the stirring rod 4 and the inner wall of the coal powder bin 1, can effectively reduce local accumulation and dead corners, and improve the utilization rate of the bin capacity; in addition, it can also improve the ventilation conditions of the coal powder bin 1, help reduce the temperature in the bin, and reduce the risk of spontaneous combustion and explosion of coal powder.

[0044] In addition, the inclined stirring rod 4 can improve the fluidity of the coal powder, especially for the coal powder with high viscosity, which can help prevent the coal powder from forming stubborn accumulation on the stirring rod 4 through the action of gravity, and facilitate the later cleaning and maintenance; at the same time, the inclined stirring rod 4 can better adapt to the spatial layout of the coal powder bin 1, especially in the occasions where the space is limited or special angle transportation is required, this arrangement is more advantageous. Therefore, through the above arrangement, not only the coal powder is homogenized, the cavity existing when the coal powder is accumulated is eliminated, which helps to improve the overall performance of the coal powder bin 1, but also contributes to the safe production and energy conservation and emission reduction of the enterprise.

[0045] At the same time, by setting up a speed sensor 51, a level sensor 52 and a pressure sensor 53 and connecting them to the PLC automatic control device 7, the rotation speed of the rotating system can be adjusted in real time according to the storage capacity of the coal powder bin 1 to achieve closed-loop control, so that the coal powder follows the movement to change the coal powder accumulation state, thereby achieving uniform distribution of coal powder and eliminating cavities existing when coal powder is accumulated, and avoiding equipment damage caused by excessive vibration, thereby greatly improving production efficiency.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An automatic anti-blocking system for a pulverized coal bunker, comprising a pulverized coal bunker, characterized in that: Also includes: Two rotating racks are provided and are rotatably mounted on the top and bottom of the pulverized coal bin respectively, and the two rotating racks are arranged in parallel; A plurality of stirring rods are provided, and both ends are rotatably mounted on the two rotating frames, and at least two stirring rods are arranged in an inclined state with an acute angle to the rotation axis of the rotating frame; A spiral structure, spirally wound around the outer circumference of the stirring rod, for stirring the coal powder; An elastic coupling, used for connecting the stirring rod and the rotating frame; as well as The driving mechanism is used to drive the stirring rod to rotate and revolve.

2. The automatic anti-blocking system for coal powder silo according to claim 1 is characterized in that: Among the plurality of stirring rods, one stirring rod is arranged along the rotation axis of the rotating frame, and the other stirring rods are arranged at an inclination.

3. The automatic anti-blocking system for coal powder silo according to claim 1 is characterized in that: The plurality of stirring rods are all arranged obliquely and are spatially enclosed to form a polygonal pyramid shape.

4. The automatic anti-blocking system for coal powder silo according to claim 1 is characterized in that: The included angles between the plurality of inclined stirring rods and the rotation axis of the rotating frame are different from each other or different from each other.

5. The automatic anti-blocking system for coal powder silo according to claim 1 is characterized in that: The spiral structure is configured as a spiral groove or a spiral blade.

6. An automatic anti-blocking system for coal powder silo according to any one of claims 1 to 5, characterized in that: The rotating frame is provided with a speed sensor for monitoring the rotation speed of the stirring rod, the coal powder bin is provided with a material level sensor in the coal powder bin, and a pressure sensor is provided at the bottom, the speed sensor, the material level sensor and the pressure sensor are connected to a PLC automatic control device, and the PLC automatic control device is connected to the driving mechanism; The PLC automatic control device is used to receive the signals output by the speed sensor, the material level sensor and the pressure sensor, and output a control signal to the driving mechanism.

7. The automatic anti-blocking system for coal powder silo according to claim 6, characterized in that: The PLC automatic control device is configured as follows: When the pressure sensor detects that the pressure in the pulverized coal bin exceeds a set value, the driving mechanism is controlled to start so as to drive the stirring rod to rotate; When the pressure sensor detects that the pressure in the pulverized coal bin drops below a set value, the driving mechanism is controlled to stop working.

8. The automatic anti-blocking system for coal powder silo according to claim 7, characterized in that: The PLC automatic control device is also configured as: When the pressure sensor detects that the pressure in the pulverized coal bin increases and the material level sensor detects that the material level in the pulverized coal bin increases, controlling the driving mechanism to increase the rotation speed of the stirring rod; When the pressure sensor detects that the pressure in the pulverized coal bin decreases and the material level sensor detects that the material level in the pulverized coal bin decreases, the driving mechanism is controlled to reduce the rotation speed of the stirring rod.

9. The automatic anti-blocking system for coal powder silo according to claim 8, characterized in that: The PLC automatic control device is also configured as: When the pressure sensor detects that the pressure in the coal powder bin continues to increase and the material level sensor detects that the material level in the coal powder bin remains unchanged for a long time, the emergency anti-blocking mode is entered, and the driving mechanism is controlled to adjust the rotation speed of the stirring rod to the maximum value; And after entering the emergency anti-blocking mode for a certain period of time, if the pressure sensor detects that the pressure in the coal powder bin decreases, the emergency anti-blocking mode is exited; if the pressure sensor detects that the pressure in the coal powder bin has no downward trend, an alarm signal is output to notify the operator to handle it.

10. The automatic anti-blocking system for coal powder silo according to claim 1, characterized in that: The driving mechanism is configured to include a main driving motor installed outside the pulverized coal bin and an auxiliary driving motor installed on the rotating frame, wherein the main driving motor is used to drive the rotating frame to rotate, and the auxiliary driving motor is provided in plurality and is respectively used to drive the plurality of stirring rods to rotate in a one-to-one correspondence; Alternatively, the driving mechanism is configured as a power motor installed outside the pulverized coal bin, a sun gear is coaxially fixed to the output end of the power motor, an inner ring gear is fixed to the rotating frame, a plurality of planetary gears are meshingly connected between the sun gear and the inner ring gear, and the plurality of stirring rods are respectively installed on the sun gear and / or the plurality of planetary gears.

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