Impact-proof stone coal hopper level measuring device

Abstract

The present application relates to the technical field of coal pulverizing equipment of coal-fired boiler of thermal power plant, and discloses a stone coal hopper level measuring device capable of preventing impact, which comprises a stone coal hopper shell, a feeding pipe is fixedly connected to the top of the stone coal hopper shell, a radar level meter is fixedly connected to the top of the stone coal hopper shell, the detection end of the radar level meter is located in the interior of the stone coal hopper shell, a cleaning assembly is arranged on the inner wall of the top of the stone coal hopper shell, the cleaning assembly comprises a gas blowing pipe fixed on the inner wall of the top of the stone coal hopper shell through bolts, and a plurality of gas blowing nozzles are arranged on the outer periphery of the gas blowing pipe. The present application gradually attenuates impact energy from flow guiding and dispersing, energy absorption, physical blocking to secondary buffering, protects the sensitive end of the radar level meter in all directions, effectively solves the problems that the radar probe rod is easy to bend and the antenna cover is easy to break in the prior art, greatly prolongs the service life of the equipment, and reduces the maintenance cost and downtime.

Description

Technical Field

[0001] This invention relates to the technical field of pulverizing equipment for coal-fired boilers in thermal power plants, specifically to an impact-resistant stone and coal hopper level measuring device. Background Technology

[0002] In thermal power plants, coal mills are key equipment for grinding raw coal into pulverized coal. Because raw coal often contains non-combustible substances such as coal gangue, stones, and metallic impurities, these impurities cannot be ground into qualified pulverized coal in the coal mill and will be discharged from the bottom of the coal mill in the form of "stone coal". The stone coal hopper, as a container for collecting and temporarily storing stone coal, is an important part of the slag discharge process of the pulverizing system.

[0003] Currently, most existing stone and coal hopper level monitoring systems use non-contact radar measurement, which is theoretically suitable for dusty environments. However, in actual operation, the coal dust concentration inside the stone and coal hopper is extremely high, and dust easily accumulates on the surface of the radar wave transmitter, leading to radar signal attenuation, weakened reflected waves, a significant decrease in measurement accuracy, or even complete loss of signal. When the stones and coal are discharged from the coal mill, they have a large falling speed and kinetic energy, which can directly impact the radar probe, easily causing the probe to bend and the radome to break, seriously affecting the equipment's lifespan.

[0004] Therefore, in order to improve the practicality of the stone and coal hopper level measuring device, and at the same time to promote technological progress in the industry and enhance core technological competitiveness, this application proposes a new implementation scheme that is different from the impact-resistant stone and coal hopper level measuring device and application method in the prior art. Summary of the Invention

[0005] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides an impact-resistant stone and coal hopper level measuring device, primarily designed to solve the problems of dust adhesion and impact damage in stone and coal hopper level measuring devices.

[0006] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: An impact-resistant stone and coal hopper level measuring device includes a stone and coal hopper shell. A feed pipe is fixedly connected to the top of the stone and coal hopper shell. A radar level gauge is fixedly connected to the top of the stone and coal hopper shell, with the detection end of the radar level gauge located inside the stone and coal hopper shell. A cleaning assembly is provided on the top inner wall of the stone and coal hopper shell. The cleaning assembly includes an air blowing pipe fixed to the top inner wall of the stone and coal hopper shell by bolts. Multiple air blowing nozzles are arranged around the outer periphery of the air blowing pipe. The axis of the air blowing nozzles forms an angle of 10°-20° with the axis of the radar level gauge detection end, forming a spiral airflow. A protective assembly is provided on the top inner wall of the stone and coal hopper shell. The protective assembly includes an impact guide shroud fixed to the top inner wall of the stone and coal hopper shell by bolts. An elastic buffer layer is fixedly connected to one side of the impact guide shroud. A rigid protective cover is fixedly connected to the bottom of the elastic buffer layer. Multiple elastic rods are fixedly connected to the inner wall of the impact guide shroud. The elastic rods are arranged in a ring array on the inner wall of the impact guide shroud, and the multiple elastic rods have an inverted conical structure.

[0007] Furthermore, a pneumatic valve A is connected to one side of the feed pipe via a flange, and a pneumatic valve B is connected to the other end of the pneumatic valve A via a flange. The pneumatic valve A is located on one side of the stone and coal hopper shell, and the pneumatic valve B is located on the side of the coal mill.

[0008] Based on the aforementioned scheme, the air blowing pipe has a ring structure, and a connector is provided on one side of the air blowing pipe, with one end of the connector connected to an external air source.

[0009] As a further embodiment of the present invention, the impact guide is a 95% alumina ceramic cover that is tilted at an angle of 30°-40°.

[0010] Furthermore, the elastic buffer layer is a hot-pressed composite structure of porous polyurethane and silicone rubber, with a thickness of 20-30 mm.

[0011] Based on the aforementioned scheme, the rigid protective cover is a 316L stainless steel perforated mesh cover with a thickness of 1.2-1.8mm.

[0012] As a further embodiment of the present invention, a grid plate is fixedly connected to the inner wall of the stone and coal hopper shell, and the grid plate is inclined.

[0013] Furthermore, a slag discharge door is provided on one side of the stone and coal hopper shell, the lowest end of the grid plate is located on one side of the slag discharge door, a door rod is fixedly connected to one side of the slag discharge door, and an electric push rod is rotatably connected to one side of the stone and coal hopper shell, and the output shaft of the electric push rod is rotatably connected to one end of the door rod.

[0014] On the basis of the aforementioned solution, a discharging pipe is arranged at the bottom of the stone coal hopper housing, an electric discharge valve is arranged on the outer surface of the discharging pipe, a screw conveyor is arranged at the bottom of the discharging pipe, and a motor is arranged on one side of the screw conveyor.

[0015] As a further solution of the present invention, an observation window is arranged at the top of the stone coal hopper housing, a conveying belt is arranged on one side of the stone coal hopper housing, and the conveying belt is located below the slag discharge door.

[0016] (3) Beneficial Effects Compared with the prior art, the present invention provides an anti-impact stone coal hopper material level measuring device, which has the following beneficial effects: 1. The present invention innovatively designs a multi-stage buffer protection system composed of an impact deflector, an elastic buffer layer, a rigid protective cover and an elastic rod. This multi-stage protection system attenuates impact energy step by step from flow diversion and dispersion, energy absorption, physical blocking to secondary buffering, and comprehensively protects the detection sensitive end of the radar level gauge, effectively solving the problems that the radar probe rod is easy to bend and the radome is easy to break in the prior art, greatly extending the service life of the equipment, and reducing maintenance costs and downtime.

[0017] 2. According to the present invention, the annular air blowing pipe is arranged on the inner wall of the top of the stone coal hopper housing, a plurality of air blowing nozzles are annularly arranged on the outer periphery of the air blowing pipe, and a spiral air flow is formed when compressed air is jetted. The spiral air flow spirally descends along the surface of the detection end, which can effectively strip the attached coal powder and dust, and prevent radar signal attenuation or false alarm caused by dust accumulation. Compared with the cleaning method adopting single-point direct blowing or simple annular blowing in the prior art, the spiral air flow cleaning method of the present invention has more uniform air flow distribution, wider cleaning coverage range and more thorough cleaning effect.

[0018] 3. According to the present invention, the inclined grid plate is arranged on the inner wall of the stone coal hopper to intercept large-particle stone coal above the partition plate, and fine-particle materials fall into the lower funnel area, so as to realize preliminary separation of coarse and fine slags. The separation and discharge design of the present invention effectively avoids the blockage problem of the slag discharge port, reduces the load and wear of downstream conveying equipment, and facilitates the classified treatment and resource utilization of coarse and fine slags. Meanwhile, after the coarse and fine separation, the fine slag can be discharged continuously, uniformly and controllably through the screw conveyor, and in linkage with the real-time monitoring data of the radar level gauge, the automatic intelligent control of the slag discharge process can be realized, and the operation efficiency and reliability of the slag discharge link of the entire pulverizing system can be improved. Brief Description of the Drawings

[0019] Figure 1 is a schematic diagram of the three-dimensional structure of the anti-impact stone coal hopper material level measuring device proposed by the present invention; Figure 2 is a schematic diagram of a partial three-dimensional structure of the anti-impact stone coal hopper material level measuring device proposed by the present invention; Figure 3 This is a partial top view schematic diagram of an impact-resistant stone and coal hopper level measuring device proposed in this invention; Figure 4 This is a partial cross-sectional view of the impact-resistant stone and coal hopper level measuring device proposed in this invention. Figure 5 This is a schematic diagram of the cleaning component structure of an impact-resistant stone and coal hopper level measuring device proposed in this invention. Figure 6 This is a schematic diagram of the protective component structure of an impact-resistant stone and coal hopper level measuring device proposed in this invention.

[0020] In the diagram: 1. Stone and coal hopper shell; 2. Feed pipe; 3. Pneumatic valve A; 4. Pneumatic valve B; 5. Radar level gauge; 6. Air blowing pipe; 7. Air blowing nozzle; 8. Connector; 9. Impact guide shroud; 10. Elastic buffer layer; 11. Rigid protective cover; 12. Elastic rod; 13. Grid plate; 14. Slag discharge gate; 15. Gate rod; 16. Electric push rod; 17. Discharge pipe; 18. Electric discharge valve; 19. Screw conveyor; 20. Motor; 21. Observation window; 22. Conveyor belt. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Reference Figures 1-6 An impact-resistant stone and coal hopper level measuring device includes a stone and coal hopper shell 1, a feed pipe 2 welded to the top of the stone and coal hopper shell 1, and a pneumatic valve A3 connected to one side of the feed pipe 2 via a flange, and a pneumatic valve B4 connected to the other end of the pneumatic valve A3 via a flange. The pneumatic valve A3 is located on one side of the stone and coal hopper shell 1 and is used to control the opening and closing of the stone and coal hopper shell 1. The pneumatic valve B4 is located on one side of the coal mill and is used to control the opening and closing of the coal mill. A radar level gauge 5 is fixed to the top of the stone and coal hopper shell 1 by bolts, and the detection end of the radar level gauge 5 is located inside the stone and coal hopper shell 1. The top inner wall of the stone and coal hopper shell 1 is equipped with a cleaning assembly, which includes an air blowing pipe 6 fixed to the top inner wall of the stone and coal hopper shell 1 by bolts. The air blowing pipe 6 has a ring structure, and multiple air blowing nozzles 7 are arranged around the outer periphery of the air blowing pipe 6. The axis of the air blowing nozzles 7 forms an angle of 10°-20° with the axis of the detection end of the radar level gauge 5, forming a spiral airflow to clean the dust on the surface of the detection end of the radar level gauge 5. The air source pressure is 0.3-0.6MPa, and the cleaning cycle is 1-5 minutes / time. A connector 8 is provided on one side of the air blowing pipe 6, and one end of the connector 8 is connected to an external air source. The inner top wall of the stone and coal hopper shell 1 is equipped with a protective assembly, which includes an impact guide shroud 9 bolted to the inner top wall of the stone and coal hopper shell 1. The impact guide shroud 9 is an inclined 95% alumina ceramic shroud with an inclination angle of 30°-40°, used to guide the vertical coal flow to the inner wall of the hopper and disperse the impact kinetic energy. An elastic buffer layer 10 is bolted to one side of the impact guide shroud 9. The elastic buffer layer 10 is a porous polyurethane and silicone rubber hot-pressed composite structure with a thickness of 20-30mm, wrapped around one side of the impact guide shroud 9, used to absorb 80 The impact energy is above 90% and the vibration transmission is isolated. The bottom of the elastic buffer layer 10 is fixed with a rigid protective cover 11 by bolts. The rigid protective cover 11 is a 316L stainless steel perforated mesh cover with a thickness of 1.2-1.8mm. It does not contact the sensitive end of the radar level gauge 5. It allows coal powder to pass through but blocks coal blocks with a particle size >10mm from directly impacting the probe rod. The inner wall of the impact guide shroud 9 is fixed with multiple elastic rods 12 by bolts. The elastic rods 12 are distributed in a ring array on the inner wall of the impact guide shroud 9. The multiple elastic rods 12 have an inverted conical structure to buffer the falling stones and coal blocks. The inner wall of the stone and coal hopper shell 1 is fixed with a grid plate 13 by bolts. The grid plate 13 is inclined and can intercept large-diameter stones and coal above the partition. Fine particles fall into the funnel area below, realizing the initial separation of coarse and fine slag. A slag discharge door 14 is provided on one side of the stone and coal hopper shell 1. The lowest end of the grid plate 13 is located on one side of the slag discharge door 14. A door rod 15 is fixed to one side of the slag discharge door 14 by bolts. An electric push rod 16 is rotatably connected to one side of the stone and coal hopper shell 1, and the output shaft of the electric push rod 16 is rotatably connected to one end of the door rod 15. The bottom of the stone and coal hopper shell 1 is provided with a discharge pipe 17, and the outer surface of the discharge pipe 17 is provided with an electric discharge valve 18. The bottom of the discharge pipe 17 is provided with a screw conveyor 19, and a motor 20 is provided on one side of the screw conveyor 19. The screw conveyor 19 can transport the filtered fine particulate material. The top of the stone and coal hopper shell 1 is equipped with an observation window 21, which allows for direct monitoring of the material level inside the stone and coal hopper shell 1; A conveyor belt 22 is provided on one side of the stone and coal hopper shell 1, and the conveyor belt 22 is located below the slag discharge gate 14.

[0023] Working principle of this embodiment: During use, the top of the stone and coal hopper shell 1 receives stone and coal from the coal mill through the feed pipe 2. Pneumatic valve A3 and pneumatic valve B4 adopt a series double valve structure to form an interlocked control: pneumatic valve B4 is located on the coal mill side and controls the opening and closing of the coal mill slag discharge channel, while pneumatic valve A3 is located on the coal hopper side and controls the feeding of the stone and coal hopper. The radar level gauge 5 is installed on the top of the stone and coal hopper shell 1, with its detection end extending into the inside of the coal hopper. It uses high-frequency radar waves to perform non-contact scanning of the material surface inside the coal hopper.

[0024] After the radar waves are emitted, they are reflected by the material surface. The material level height is calculated according to the time-of-flight method, and the real-time data is transmitted to the control system to realize continuous material level monitoring and high / low material level alarm. An air-blowing pipe 6 is arranged in a ring around the detection end of the radar level gauge 5. Multiple air-blowing nozzles 7 are evenly distributed around the outer perimeter. When compressed air is sprayed, a spiral airflow is formed. The spiral airflow spirals downward along the surface of the detection end, effectively stripping away the attached coal powder and dust, preventing dust accumulation from causing radar signal attenuation or false alarms, and ensuring long-term cleanliness of the detection end and stable measurement accuracy. The impact guide shroud 9 directs the vertically falling high-speed stone and coal flow to the inner wall of the coal hopper, changing the impact direction and avoiding direct impact on the detection end of the radar level gauge 5. The inclined surface allows the coal flow to slide down the wall, dispersing and concentrating the impact energy. The elastic buffer layer 10 utilizes the compression deformation of porous materials and the high resilience of silicone rubber to absorb more than 80% of the impact energy, isolate vibration transmission, and protect the internal precision detection elements. The rigid protective cover 11 has mesh that allows coal powder to pass through smoothly without obstructing normal material feeding. It effectively blocks coal blocks with a particle size >10mm from directly impacting the radar probe, forming a physical barrier. The elastic rod 12 has an inverted conical structure and is distributed in a ring array on the inner wall of the impact guide shroud 9. It provides secondary buffering for the stone and coal blocks falling into the shroud. The inverted conical design allows the buffered material to slide down the rod to the bottom of the coal hopper, avoiding accumulation.

[0025] All electrical components mentioned in this article are connected to an external main controller and 220V AC mains power, and the main controller can be a conventional known device such as a computer that provides control.

[0026] In the description herein, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] In the description herein, it should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0028] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An impact-resistant stone and coal hopper level measuring device, comprising a stone and coal hopper shell, characterized in that, A feed pipe is fixedly connected to the top of the stone and coal hopper shell, and a radar level gauge is also fixedly connected to the top of the stone and coal hopper shell. The detection end of the radar level gauge is located inside the stone and coal hopper shell. A cleaning assembly is provided on the top inner wall of the stone and coal hopper shell. The cleaning assembly includes an air blowing pipe fixed to the top inner wall of the stone and coal hopper shell by bolts. Multiple air blowing nozzles are arranged around the outer periphery of the air blowing pipe. The axis of the air blowing nozzles forms an angle of 10°-20° with the axis of the radar level gauge detection end, forming a spiral airflow. A protective assembly is provided on the top inner wall of the stone and coal hopper shell. The protective assembly includes an impact guide shroud fixed to the top inner wall of the stone and coal hopper shell by bolts. An elastic buffer layer is fixedly connected to one side of the impact guide shroud. A rigid protective cover is fixedly connected to the bottom of the elastic buffer layer. Multiple elastic rods are fixedly connected to the inner wall of the impact guide shroud. The elastic rods are arranged in a ring array on the inner wall of the impact guide shroud, and the multiple elastic rods have an inverted conical structure.

2. The impact-resistant stone and coal hopper level measuring device according to claim 1, characterized in that, One side of the feed pipe is connected to a pneumatic valve A via a flange, and the other end of the pneumatic valve A is connected to a pneumatic valve B via a flange. Pneumatic valve A is located on one side of the stone and coal hopper shell, and pneumatic valve B is located on the side of the coal mill.

3. The impact-resistant stone and coal hopper level measuring device according to claim 1, characterized in that, The air blowing pipe has a ring structure, and a connector is provided on one side of the air blowing pipe. One end of the connector is connected to an external air source.

4. The impact-resistant stone and coal hopper level measuring device according to claim 1, characterized in that, The impact guide shield is a 95% alumina ceramic shield that is tilted at an angle of 30°-40°.

5. The impact-resistant stone and coal hopper level measuring device according to claim 1, characterized in that, The elastic buffer layer is a porous polyurethane and silicone rubber hot-pressed composite structure with a thickness of 20-30mm.

6. The impact-resistant stone and coal hopper level measuring device according to claim 1, characterized in that, The rigid protective cover is a 316L stainless steel perforated mesh cover with a thickness of 1.2-1.8mm.

7. The impact-resistant stone and coal hopper level measuring device according to claim 1, characterized in that, The inner wall of the stone and coal hopper shell is fixedly connected with a grid plate, which is set at an angle.

8. The impact-resistant stone and coal hopper level measuring device according to claim 1, characterized in that, A slag discharge door is provided on one side of the stone and coal hopper shell. The lowest end of the grid plate is located on one side of the slag discharge door. A door rod is fixedly connected to one side of the slag discharge door. An electric push rod is rotatably connected to one side of the stone and coal hopper shell, and the output shaft of the electric push rod is rotatably connected to one end of the door rod.

9. The impact-resistant stone and coal hopper level measuring device according to claim 1, characterized in that, The bottom of the stone and coal hopper shell is provided with a discharge pipe, and the outer surface of the discharge pipe is provided with an electric discharge valve. The bottom of the discharge pipe is provided with a screw conveyor, and a motor is provided on one side of the screw conveyor.

10. The impact-resistant stone and coal hopper level measuring device according to claim 1, characterized in that, The top of the stone and coal hopper shell is provided with an observation window, and a conveyor belt is provided on one side of the stone and coal hopper shell, with the conveyor belt located below the slag discharge door.

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