Anti-blocking intelligent monitoring and dredging system and method for weighing type coal feeder

Abstract

The invention relates to an anti-blocking intelligent monitoring and dredging system and method for a weighing type coal feeder. The system comprises a hydraulic drive and pneumatic composite gun barrel assembly, a coal feeder accumulated coal removing device, a monitoring device and a grading interlocking control module. The method comprises the following steps: entering different early warning levels according to a monitoring value of a monitoring device, and executing corresponding intelligent early warning actions. Through the technical combination of structure optimization, multi-dimensional perception, intelligent linkage and automatic treatment, closed-loop treatment of raw coal dredging is achieved, real-time monitoring and rapid treatment of raw coal blockage can be effectively achieved, the reliability of the system is improved, and the system has remarkable technical advancement and engineering application value.

Description

Technical Field

[0001] The present invention relates to the technical field of coal transportation for thermal power generation, and in particular to an anti-blocking intelligent monitoring and dredging system and method for a coal feeder. Background Art

[0002] In thermal power plants, coal feeders are crucial for transporting coal from the raw coal bunker to the boiler. However, the raw coal bunker and coal drop pipes are prone to blockage due to coal compaction, adhesion to the wall, or increased humidity. This can lead to coal supply interruptions, impacting power generation efficiency and equipment safety.

[0003] Existing unblocking methods often rely on manual intervention or single mechanical vibration, resulting in low efficiency, delayed response, and a lack of real-time monitoring. This is particularly true for deep or stubborn blockages, where conventional methods are difficult to effectively clear and lack intelligent closed-loop processing mechanisms. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention provides an anti-blocking intelligent monitoring and dredging system and method for a coal feeder to solve the above problems.

[0005] The present invention provides the following technical solutions: An anti-blocking intelligent monitoring and dredging system for a weighing-type coal feeder, comprising: A hydraulic and pneumatic composite gun barrel assembly, comprising a hydraulic advance and retreat gun barrel, a hydraulic cylinder, a hydraulic rod, an air cannon tank, and a connecting rod. The hydraulic rod is arranged parallel to the hydraulic advance and retreat gun barrel and fixedly connected by the connecting rod. A conical crushing head is sleeved on the front end of the hydraulic advance and retreat gun barrel, and a nozzle is provided on the conical crushing head. The nozzle is connected to the air cannon tank through the hydraulic advance and retreat gun barrel, and the hydraulic rod is retracted and extended in the hydraulic cylinder. A coal feeder coal accumulation removal device, the removal device comprising an arc-shaped guide tube and a rapping device, the arc-shaped guide tube being arranged at the outlet of the coal feeder, and the rapping device being installed on the arc-shaped guide tube; A monitoring device, comprising a weighing calculator, an ultrasonic thickness gauge, and an infrared camera. The weighing calculator is used to monitor changes in the amount of coal falling, the ultrasonic thickness gauge detects the thickness of attachments on the coal falling pipe wall, and the infrared camera is used to identify local hot spot temperatures on the pipe wall. The hierarchical interlocking control module enters different warning levels according to the monitoring values ​​of the coal drop pipe monitoring device and executes corresponding warning actions.

[0006] Furthermore, the hydraulic and pneumatic composite gun barrel assembly is welded to the lower portion of the outer wall of the coal drop pipe.

[0007] Furthermore, there are four nozzles, which are symmetrically distributed.

[0008] Furthermore, the arc-shaped guide tube should be made of wear-resistant steel material, and the surface should be polished or smoothed.

[0009] Furthermore, the warning levels include level one, level two and level three; the trigger conditions include the decrease in the amount of coal falling, the thickness of the pipe wall attachments and the local hot spot temperature of the pipe wall; the anti-blocking actions include the rapping of the guide tube, the hydraulically driven crushing and pneumatically driven crushing of the hydraulic and pneumatic composite gun barrel assembly.

[0010] The present invention also discloses a method for intelligently monitoring and unblocking anti-blocking of a weighing-type coal feeder. The method includes: Step S1, monitoring the change in the amount of coal dropped from the raw coal bin of the weighing coal feeder, monitoring the thickness of the wall attachments of the coal drop pipe with an ultrasonic thickness gauge, and monitoring the local hot spots with an infrared camera; Step S2: Determine whether to enter the early warning mode based on the above monitoring values: If the coal falling rate drops by 20kg / s compared to the normal value and lasts for 5s, or the wall thickness of the attachment is 2-5mm, or the local short-term temperature difference fluctuates by 3-5°C, enter the first-level early warning mode; Step S3, executing the first-level warning level action, automatically putting the rapping tube of the guide tube into operation; Step S4: Continuously monitor the above monitoring values. If the coal falling rate has not returned to normal after 20 seconds of the rapping drum operation or the coal falling rate has dropped by 30 kg / s compared to the normal value, or the wall thickness of the attachment is 5-10 mm, or the short-term temperature difference fluctuates by 5-10 ° C, enter the secondary warning mode; Step S5, executing the second-level warning level action, automatically engaging the hydraulically driven crushing of the rapping cylinder of the guide cylinder and the hydraulic and pneumatic composite gun barrel assembly; Step S6: Continuously monitor the above monitoring values. If the coal falling rate has not returned to normal or has decreased by 35 kg / s compared to normal after the gun barrel has been in place for a certain period of time, or the wall thickness of the attachment is ≥10 mm, or the short-term temperature fluctuation is ≥10°C, the system enters the third-level warning mode. Step S7, executing the third-level warning level action, automatically putting into operation the hydraulically driven crushing and pneumatically driven crushing of the rapping cylinder of the guide cylinder and the hydraulic and pneumatic composite gun barrel assembly.

[0011] Step S8: continuously monitor the above monitoring value, and if the monitoring value returns to normal, stop the above warning action.

[0012] The present invention has the following beneficial technical effects: The present invention realizes efficient clearing of blockages through the combined synergy of pneumatic and hydraulic forces; corresponding anti-blockage actions are performed according to different warning levels, which can save energy when the blockage level is low and is more efficient when the blockage level is high, making the entire dredging and cleaning process more intelligent.

[0013] This invention achieves a closed-loop process for raw coal unblocking by monitoring blockage conditions in multiple dimensions (e.g., coal volume, wall thickness, and local hotspot temperature), combined with intelligent interlocking and automated processing technologies. This effectively enables real-time monitoring and rapid resolution of raw coal blockages, improving the reliability of the pulverizing system and demonstrating significant technological advancement and engineering application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic structural diagram of the hydraulic and pneumatic composite gun barrel assembly of the present invention; Figure 2 It is a structural schematic diagram of the coal feeder coal accumulation removal device of the present invention.

[0015] The reference numerals in the figures are: 1. Gun barrel; 2. Connecting parts; 3. Hydraulic cylinder; 4. Air cannon tank; 5. Gun barrel sleeve; 6. Outer wall of coal drop pipe; 7. Gun head; 8. Nozzle; 9. Hydraulic rod; 10. Coal feeder conveyor belt; 11. Vibrating tube; 12. Rubber tube; 13. Base; 14. Raw coal bin; 15. Diversion tube. DETAILED DESCRIPTION

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only 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 making creative efforts are within the scope of protection of the present invention.

[0017] Example 1 This embodiment provides an anti-blocking intelligent monitoring and unblocking system for a weighing-type coal feeder, comprising a hydraulic and pneumatic composite gun barrel assembly, a coal feeder coal accumulation removal device, a monitoring device, and a hierarchical interlocking control module.

[0018] like Figure 1-2 As shown, a hydraulic and pneumatic composite gun barrel assembly for an intelligent anti-clogging monitoring and unblocking system for a weighing coal feeder features four bases 13 welded to the lower portion of the outer wall 6 of the coal drop pipe. A hydraulic cylinder 3 is mounted below each base 13, and above it is a hollow hydraulic advance and retract barrel 1. The rear of barrel 1 is connected to the air cannon tank 4 via a rubber tube 12. The hydraulic rod 9 of the hydraulic cylinder 3 is locked to the upper barrel 1 via a connector 2 fixed to the base 13, driving the barrel 1 forward and backward. The front of barrel 1 features a conical gun head 7, which is made of wear-resistant cemented carbide and has a length of 80 mm. The rear diameter gradually expands to a circular shape with a diameter of 30 mm and a wall thickness of 5 mm. Gun head 7 is equipped with four symmetrical nozzles 8 for air flow. These nozzles are circular, 10 mm in diameter, and evenly distributed at the front end of the conical crushing head, at a 45-degree angle to the central axis.

[0019] During use, the gun barrel 1 is inserted into the outer wall 6 of the coal drop pipe, and the gun barrel sleeve 5 seals against the outer wall 6 of the coal drop pipe, ensuring that the raw coal is leak-free. The hydraulic and pneumatic composite gun barrel assembly has two crushing modes: the first is hydraulically driven crushing, in which the gun head 7 pushes the gun barrel 1 forward through the hydraulic cylinder 3, squeezing the accumulated coal. The thrust is determined by the output of the hydraulic cylinder 3, with a maximum thrust of 5kN. The second is pneumatically driven crushing, in which the air cannon tank 4 is linked to the nozzle 8. Compressed air is directed through the interior of the gun barrel 1 and passes through the four nozzles 8 to form a shock wave. The air cannon tank has an operating pressure of 0.6-1.0MPa, and the pulse frequency is adjustable between 0.5-5Hz. These two crushing modes can be performed separately or simultaneously.

[0020] like Figure 2 The device, shown in Figure 1, features an intelligent monitoring and unblocking system for weighing coal feeders. A curved guide tube 15, made of wear-resistant steel and polished, is installed at the outlet of the feeder conveyor belt 10. Raw coal tends to become clogged when passing through the guide tube 15. A rapping tube 11 is installed above to smooth the flow of the raw coal. The rapping frequency is 2-5 Hz, and the rapping force is 50-500 N.

[0021] like Figure 2 The figure also shows the outer wall of the double-tapered, variable-diameter coal drop pipe of the weighing coal feeder. The upper area, which accounts for 80% of the total length of the coal drop pipe, is a vertically expanded section with a 10%-20% increase in diameter, reducing the frequency of coal flow impact contact and alleviating wall sticking. The lower area, which accounts for 20% of the coal drop pipe, is the funnel discharge section. It adopts a 60° cone angle and parabolic transition design, which conforms to the gravity trajectory of the coal flow while facilitating the output of the vibration device.

[0022] In this embodiment, a gravimetric coal feeder anti-clogging intelligent monitoring and unblocking system also includes a monitoring device comprising a weighing calculator, an ultrasonic thickness gauge, and an infrared camera. The weighing calculator is installed below the coal drop pipe to monitor changes in the amount of coal dropped; the ultrasonic thickness gauge is installed on the outer wall of the coal drop pipe to detect the thickness of deposits on the pipe wall; and the infrared camera is installed on the outer wall of the coal drop pipe near the separator to identify local hotspot temperatures on the pipe wall.

[0023] In this embodiment, a weighing-type coal feeder anti-blocking intelligent monitoring and unblocking system also includes a hierarchical interlocking control module, which is respectively connected to the hydraulic and pneumatic composite gun barrel assembly, the coal feeder coal accumulation removal device, and the monitoring device. The hierarchical interlocking control module enters different warning levels according to the monitoring value of the coal drop pipe monitoring device and executes corresponding warning actions. The details are as follows: Level 1 warning: If the coal falling rate drops by 20 kg / s compared to the normal value and lasts for 5 seconds, or the wall thickness of the attachment is 2-5 mm, or the local short-term temperature difference fluctuates by 3-5 ° C, the rapping tube 11 of the guide tube 15 will be automatically put into operation.

[0024] Level 2 warning: If the coal falling rate has not returned to normal 20 seconds after the rapping drum is put into operation, or the coal falling rate drops by 30 kg / s compared with the normal value, or the wall thickness of the attachment is 5-10 mm, or the local short-term temperature difference fluctuates by 5-10 ° C, the rapping drum 11 of the guide drum 15 and the hydraulically driven crushing of the hydraulic and pneumatic composite gun barrel assembly will be automatically put into operation.

[0025] Level 3 warning: When the gun barrel 1 has been in place for a certain period of time, the coal falling amount has not returned to the normal value or the coal falling amount has dropped by 35kg / s compared with the normal value, or the wall thickness of the attachment is ≥3mm, or the local short-term temperature difference fluctuation is ≥7℃, the rapping tube 11 of the guide tube 15 and the hydraulic and pneumatic composite gun barrel assembly will be automatically put into hydraulically driven crushing and pneumatically driven crushing.

[0026] Example 2 This embodiment discloses a method for intelligent monitoring and unblocking of a weighing-type coal feeder against blockage, which uses the intelligent monitoring and unblocking system for weighing-type coal feeder against blockage in the first embodiment, and includes the following steps: Step S1, monitoring the change in the amount of coal dropped from the raw coal bin 14 of the weighing coal feeder, monitoring the thickness of the wall attachments of the coal drop pipe with an ultrasonic thickness gauge, and monitoring the local hot spots with an infrared camera; Step S2: Determine whether to enter the early warning mode based on the above monitoring values: If the coal falling rate drops by 20 kg / s compared to the normal value and lasts for 5 seconds, or the wall thickness of the attachment at point B is 2-5 mm, or the local short-term temperature difference at point C fluctuates by 3-5°C, enter the first-level early warning mode; Step S3, executing the first-level warning level action, automatically putting the rapping tube 11 of the guide tube 15 into operation; Step S4: Continuously monitor the above monitoring values. If the coal falling rate has not returned to normal after 20 seconds of the rapping drum 11 being put into operation, or the coal falling rate has dropped by 30 kg / s compared to the normal value, or the wall thickness of the attachment is 5-10 mm, or the short-term temperature difference fluctuates by 5-10°C, enter the secondary warning mode; Step S5, executing the second-level warning level action, automatically putting the rapping tube 11 of the guide tube 15 and the hydraulically driven crushing of the hydraulic and pneumatic composite gun barrel assembly into operation; Step S6: Continuously monitor the above monitoring values. If the coal falling rate has not returned to normal or has decreased by 35 kg / s compared to normal after the gun barrel has been in place for a certain period of time, or the wall thickness of the attachment is ≥10 mm, or the short-term temperature fluctuation is ≥10°C, enter the third-level warning mode. Step S7, executing the third-level warning level action, automatically putting into operation the hydraulically driven crushing and pneumatically driven crushing of the rapping tube 11 of the guide tube 15 and the hydraulic and pneumatic composite gun barrel assembly, and increasing their frequency.

[0027] Step S8: continuously monitor the above monitoring value, and if the monitoring value returns to normal, stop the above warning action.

[0028] The present invention realizes closed-loop processing of raw coal dredging through a technical combination of multi-dimensional monitoring of blockage conditions, intelligent chain and automated blockage processing, and can effectively realize real-time monitoring and rapid disposal of raw coal blockage.

[0029] The above-described embodiments merely represent specific implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. An anti-blocking intelligent monitoring and dredging system for a weighing coal feeder, characterized in that: include: A hydraulic and pneumatic composite gun barrel assembly, comprising a hydraulic advance and retreat gun barrel, a hydraulic cylinder, a hydraulic rod, an air cannon tank, and a connector. The hydraulic rod is arranged parallel to the hydraulic advance and retreat gun barrel and fixedly connected by a connector. A conical crushing head is sleeved on the front end of the hydraulic advance and retreat gun barrel. The conical crushing head is provided with a nozzle, which is connected to the air cannon tank through the hydraulic advance and retreat gun barrel. The hydraulic rod is retractable in the hydraulic cylinder. A coal feeder coal accumulation removal device, the removal device comprising an arc-shaped guide tube, a double-tapered variable-diameter coal drop pipe and a rapping device, the arc-shaped guide tube being arranged at the outlet of the coal feeder, and the rapping device being installed on the arc-shaped guide tube; A monitoring device, comprising a weighing calculator, an ultrasonic thickness gauge, and an infrared camera. The weighing calculator is used to monitor changes in the amount of coal dropped from the raw coal bin. The ultrasonic thickness gauge detects the thickness of attachments on the coal drop pipe wall. The infrared camera is used to identify the local hot spot temperature on the pipe wall. The hierarchical interlocking control module enters different warning levels according to the monitoring values ​​of the monitoring device and executes corresponding warning actions.

2. The anti-blocking intelligent monitoring and dredging system for a weighing type coal feeder according to claim 1 is characterized in that: The hydraulic and pneumatic composite gun barrel assembly is welded to the lower part of the outer wall of the coal drop pipe.

3. The anti-blocking intelligent monitoring and dredging system for coal feeder according to claim 1 is characterized in that: There are four nozzles, which are symmetrically distributed.

4. The anti-blocking intelligent monitoring and dredging system for a weighing type coal feeder according to claim 1 is characterized in that: The arc-shaped guide tube is made of wear-resistant steel material, and the rapping device is a hollow rapping tube fixedly connected to the upper part of the guide tube.

5. The anti-blocking intelligent monitoring and dredging system for a weighing type coal feeder according to claim 1 is characterized in that: The upper part of the double-tapered variable-diameter coal drop pipe, which accounts for 80% of the total length of the coal drop pipe, is a vertical expansion section with a diameter increase of 10%-20%. The lower part, which accounts for 20% of the total length of the coal drop pipe, is a funnel discharge section, which adopts a combination of a 60° cone angle and a parabolic transition.

6. The anti-blocking intelligent monitoring and dredging system for a weighing type coal feeder according to claim 1 is characterized in that: The warning levels include level one, level two and level three; the trigger conditions include the change in the amount of coal falling, the thickness of the pipe wall attachments and the local hot spot temperature of the pipe wall; the anti-blocking actions include the vibration of the guide tube, the hydraulically driven crushing and pneumatically driven crushing of the hydraulic and pneumatic composite gun barrel assembly.

7. A method for intelligent monitoring and unblocking of a weighing coal feeder, characterized in that: An anti-blocking intelligent monitoring and dredging system for a weighing-type coal feeder according to any one of claims 1 to 6 comprises: Step S1, monitoring the change in the amount of coal dropped from the raw coal bin of the weighing coal feeder, monitoring the thickness of the wall attachments of the coal drop pipe with an ultrasonic thickness gauge, and monitoring the local hot spots with an infrared camera; Step S2: Determine whether to enter the early warning mode based on the above monitoring values: If the coal falling rate drops by 20kg / s compared to the normal value and lasts for 5s, or the wall thickness of the attachment is 2-5mm, or the local short-term temperature difference fluctuates by 3-5°C, enter the first-level early warning mode; Step S3, executing the first-level warning level action, automatically putting the rapping tube of the guide tube into operation; Step S4: Continuously monitor the above monitoring values. If the coal falling rate has not returned to normal after 20 seconds of the rapping drum operation or the coal falling rate has dropped by 30 kg / s compared to the normal value, or the wall thickness of the attachment is 5-10 mm, or the short-term temperature difference fluctuates by 5-10 ° C, enter the secondary warning mode; Step S5, executing the second-level warning level action, automatically engaging the hydraulically driven crushing of the rapping cylinder of the guide cylinder and the hydraulic and pneumatic composite gun barrel assembly; Step S6: Continuously monitor the above monitoring values. If the coal falling rate has not returned to normal or has decreased by 35 kg / s compared to normal after the gun barrel has been in place for a certain period of time, or the wall thickness of the attachment is ≥10 mm, or the short-term temperature fluctuation is ≥10°C, the system enters the third-level warning mode. Step S7, executing the third-level warning level action, automatically putting into operation the hydraulically driven crushing and pneumatically driven crushing of the rapping cylinder of the guide cylinder and the hydraulic and pneumatic composite gun barrel assembly. Step S8: continuously monitor the above monitoring value, and if the monitoring value returns to normal, stop the above warning action.

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