Automatic device for cleaning accumulated dust in a pipeline of a powder selecting machine

Abstract

The application discloses a device for automatically cleaning accumulated dust in a pipeline of a powder classifier, which comprises a horizontal pipeline installed between a dynamic powder classifier and a V-shaped powder classifier, a collecting hopper is installed at the bottom of the horizontal pipeline, the collecting hopper is in communication with the horizontal pipeline, a discharging structure is installed at the bottom of the collecting hopper, the horizontal pipeline is further provided with a high-pressure nozzle assembly, the high-pressure nozzle assembly is located between the V-shaped powder classifier and the collecting hopper, the high-pressure nozzle assembly is connected with a high-pressure gas structure, a pressure transmitter is further installed at the position where the high-pressure nozzle assembly is installed in the horizontal pipeline, and the pressure transmitter and the high-pressure gas structure are both controlled by a controller. The application loosens the accumulated dust through a timing blowing system, so that fine particles enter a powder classification area along with a main airflow, coarse particles are collected in a directional manner, airflow is ensured to be stable, coarse particles in the accumulated dust are discharged into a mill elevator and then returned to a grinding system through the collecting hopper, material waste is avoided, the grinding efficiency of a roller press system is improved, and the purpose of reducing power consumption is achieved.

Description

Technical Field

[0001] This utility model relates to the field of cement production technology, and in particular to an automatic ash-cleaning device for air classifier pipelines. Background Technology

[0002] In raw material roller press systems, when a horizontal dynamic classifier and a V-type classifier are used in series, their inlet ends are connected to a 2.8m diameter horizontal water pipe. Due to uneven velocity distribution (lower wind speed at the bottom of the pipe) and particle inertial settling issues, material accumulates at the bottom of the pipe over a long period. During production, the only way to alleviate dust accumulation is to increase the rotor speed and system airflow. In severe cases, the dust thickness can reach half the pipe height, reducing the effective ventilation area by more than 40%, significantly decreasing the effective ventilation volume of the fan inlet pipe. This prevents fine particles from fully entering the classification zone, resulting in qualified fine particles being mixed with coarse powder, leading to a decrease in classification efficiency. Maintaining airflow requires increasing the rotor speed, increasing motor power consumption, and necessitates periodic shutdowns for manual dust removal, affecting continuous production and increasing safety risks and maintenance costs. Therefore, we propose an automatic dust removal device for the classifier pipes to solve these problems. Utility Model Content

[0003] This application provides an automatic dust removal device for air classifier pipelines, which solves the problem that after material settles in the pipeline of a raw material roller press system, material accumulates in the pipeline, reducing the effective ventilation area of ​​the pipeline, decreasing the ventilation volume in the pipeline, and increasing the system operating power.

[0004] This application provides an automatic dust removal device for a classifier pipeline, including a horizontal pipeline installed between a dynamic classifier and a V-type classifier. A hopper is installed at the bottom of the horizontal pipeline, and the hopper is connected to the horizontal pipeline. A discharge structure is installed at the bottom of the hopper. The horizontal pipeline is also equipped with a high-pressure nozzle assembly located between the V-type classifier and the hopper. The high-pressure nozzle assembly is connected to a high-pressure gas structure. A pressure transmitter is also installed at the location of the high-pressure nozzle assembly in the horizontal pipeline. Both the pressure transmitter and the high-pressure gas structure are controlled by a controller.

[0005] Preferably, the discharge structure includes a discharge pipe installed at the bottom of the hopper, a discharge nozzle installed at the bottom of the discharge pipe, and a flap valve provided between the discharge pipe and the discharge nozzle.

[0006] Preferably, the flap valve is a non-powered flap valve.

[0007] Preferably, an inspection window is also provided on one side of the discharge pipe.

[0008] Preferably, a mill inlet elevator is installed at the bottom of the discharge nozzle.

[0009] Preferably, the high-pressure gas structure is an air pump, which is connected to the high-pressure nozzle assembly via a high-pressure pipeline, and a solenoid valve is installed on the high-pressure pipeline.

[0010] Preferably, the high-pressure nozzle assembly is a bidirectional nozzle.

[0011] Preferably, there are multiple high-pressure nozzle assemblies, which are arranged at equal intervals along the arc direction of the horizontal pipe.

[0012] Preferably, the nozzle of the high-pressure nozzle assembly emits a cone-shaped, scattering spray.

[0013] Preferably, a hollow mesh plate is also provided at the connection between the horizontal pipe and the hopper.

[0014] As can be seen from the above technical solution, this application provides an automatic ash removal device for a classifier pipeline. This device is installed at the bottom of a horizontal pipeline and consists of a hopper, a flap valve, a pressure transmitter, a hollow mesh plate, a high-pressure nozzle assembly, and a controller. When ash accumulates in the horizontal pipeline, the pressure transmitter detects a change in the pipeline wind speed. The controller sends a signal to activate the solenoid valve, and compressed air is sprayed at high speed through the high-pressure nozzle assembly arranged on-site. The impact force breaks up the ash layer at the bottom of the horizontal pipeline, causing the ash in front of the hopper to be loosened by the external force of the spray. Some fine particles enter the dynamic classifier with the wind speed, while other coarse ash particles move forward to the hopper due to the wind speed. When the coarse particles accumulate in the hopper, and the material in the hopper accumulates to a certain amount, the flap valve automatically opens to discharge the material. The material is sent through the discharge nozzle to the conveying pipeline and re-enters the roller elevator, which then transports it to the grinding stage for further grinding of the coarse powder. After discharge, the flap valve automatically resets.

[0015] Compared with the prior art, the beneficial effects of this utility model are: 1. By setting up the collection hopper, which is installed near the air inlet of the horizontal pipe, when the air-classified material passes through the horizontal pipe, its settling position is mainly in the initial section. The normally moving material enters the dynamic air classifier through the horizontal pipe, and the settling material enters the collection hopper, which can reduce pipe blockage and ensure better wind speed and fan power. 2. By setting up high-pressure nozzle assembly and pressure transmitter, when the wind speed in the horizontal pipe decreases, high-pressure blowing can be performed on the accumulation position to ensure the effective ventilation area in the pipe, thereby ensuring the stable passage of airflow in the pipe.

[0016] In summary, this application addresses the issue of ash accumulation in the inlet pipe of a dynamic air classifier during production, ensuring efficient operation of the dynamic air classifier at normal speeds. It designs and manufactures an automatic ash-cleaning device. This device is installed inside a horizontal pipe and uses a timed blowing system to loosen the accumulated ash, allowing fine particles to enter the classification area with the main airflow, while coarse particles are collected directionally. This maintains an effective ventilation area of ​​≥95% in the pipe, ensuring stable airflow and improving the classifier's classification efficiency at its designed speed. It also reduces energy consumption caused by excessively high speeds and enhances material recycling. Coarse particles from the accumulated ash are discharged through a collection hopper and returned to the grinding system via an infeed elevator, avoiding material waste and improving the grinding efficiency of the roller press system, thereby reducing power consumption. Attached Figure Description

[0017] To more clearly illustrate the technical solution of this application, the accompanying drawings used in the implementation examples will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of an automatic dust removal device for a classifier pipeline proposed in this utility model; Figure 2 This is an enlarged view of section A of the automatic dust removal device for the air classifier pipeline proposed in this utility model; Figure 3 This is a schematic diagram of the internal structure of an automatic dust removal device for a classifier pipeline proposed in this utility model; In the diagram: 1. Dynamic air classifier, 2. Horizontal pipe, 3. V-type air classifier, 4. Collection hopper, 5. Discharge pipe, 6. Inspection window, 7. Flip valve, 8. Discharge nozzle, 9. Solenoid valve, 10. Air pump, 11. Controller, 12. Pressure transmitter, 13. High-pressure nozzle assembly, 14. Hollow mesh plate. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0020] See Figure 1-3This application discloses an automatic ash-cleaning device for air classifier pipelines. This device is used for ash-cleaning in air classification systems during cement production, ensuring normal ventilation area and air velocity within the system. Specifically, it includes a horizontal pipeline 2 installed between a dynamic air classifier 1 and a V-type air classifier 3. The diameter of the horizontal pipeline 2 is 2.8m. During operation, fine material from the V-type air classifier 3 enters the dynamic air classifier 1 through the horizontal pipeline 2. During this process, due to uneven velocity distribution, low air velocity at the bottom of the pipeline, and inertial settling of particles, material accumulates at the bottom of the pipeline over a long period, especially at the end near the V-type air classifier 3 where the settling rate is lower. The problem is quite serious, affecting the effective ventilation area of ​​the pipeline, which in turn affects the effective ventilation volume. This reduces the quality of air separation and increases the operating power of the dynamic air classifier 1, thus increasing energy consumption. Therefore, a collection hopper 4 is installed at the bottom of the horizontal pipeline 2 in this application. The collection hopper 4 is connected to the horizontal pipeline 2. The collection hopper 4 is installed in a stable airflow area near the V-type air classifier 3 to ensure normal airflow. When the material in the horizontal pipeline 2 settles, some of the settled material falls into the collection hopper 4, reducing the settling in the horizontal pipeline 2. A discharge structure is installed at the bottom of the collection hopper 4. When the settled material reaches a certain amount, it is discharged to the grinding stage for processing through the discharge structure. The horizontal pipe 2 is also equipped with a high-pressure nozzle assembly 13, which is located between the V-type classifier 3 and the collection hopper 4. Besides some sediment entering the collection hopper 4, some sediment remains within the horizontal pipe 2 between the V-type classifier 3 and the collection hopper 4. Therefore, this area needs to be cleaned regularly. Specifically, the high-pressure nozzle assembly 13 is connected to a high-pressure gas structure to enhance the compressed gas. A pressure transmitter 12 is also installed at the location where the high-pressure nozzle assembly 13 is installed in the horizontal pipe 2. Both the pressure transmitter 12 and the high-pressure gas structure are controlled by a controller 11. The high-pressure nozzle assembly 13 can be started in two ways: one is by setting a start-up cycle for periodic start-up, and the other is by monitoring the pressure transmitter 12 and starting based on changes in the wind speed within the horizontal pipe 2, thereby ensuring an effective ventilation area ≥95% and guaranteeing flow stability.

[0021] In this utility model, the discharge structure includes a discharge pipe 5 installed at the bottom of the collecting hopper 4. Since the horizontal pipe 2 is generally installed at a high position, its conveying point can be sent to a suitable position through the discharge pipe 5. A discharge nozzle 8 is installed at the bottom of the discharge pipe 5 for connecting with the receiving equipment. In this application, a mill elevator is installed at the bottom of the discharge nozzle 8 to transport the material to the grinding stage, so as to achieve the re-grinding of coarse powder. A flap valve 7 is provided between the discharge pipe 5 and the discharge nozzle 8. The discharge structure is normally closed. When the material reaches a certain amount, it is discharged in a concentrated manner to reduce the impact on the powder selection system. Specifically, the flap valve 7 is a non-powered flap valve that can automatically open to discharge material when a certain weight is reached. The discharge pipe 5 is also equipped with an inspection window 6 on one side, which facilitates the inspection of the equipment during major overhauls and also facilitates the unblocking of the pipe after blockage, thereby improving the convenience of equipment maintenance and ensuring the stable operation of the device.

[0022] In this utility model, the high-pressure gas structure is an air pump 10. When there is a compressed gas pipeline in the factory area, it can also be connected to the existing gas pipeline. The air pump 10 is connected to the high-pressure nozzle assembly 13 through the high-pressure pipeline. A solenoid valve 9 is installed on the high-pressure pipeline. The high-pressure nozzle assembly 13 is controlled by the controller 11 to start the solenoid valve 9. In this application, the high-pressure nozzle assembly 13 is a bidirectional nozzle, which is installed in the middle position between the V-type classifier 3 and the collection hopper 4. After starting, the compressed gas breaks the dust layer at the bottom of the horizontal pipe 2, so that the dust in the first half of the horizontal pipe 2 is in a loose state due to the influence of the blowing force. Some fine particles enter the classifier with the wind speed, and other coarse dust particles move forward to the collection hopper 4 due to the influence of the wind speed. In this application, there are multiple high-pressure nozzle assemblies 13, which are arranged at equal intervals along the arc direction of the horizontal pipe 2. The nozzles of the high-pressure nozzle assemblies 13 spray out in a conical scattering pattern, which can achieve large-area purging of the bottom of the horizontal pipe 2 and ensure purging quality.

[0023] In this utility model, since a large opening needs to be made at the bottom of the horizontal pipe 2 to install the collection hopper 4, if the structural strength of the pipe is insufficient, a hollow grid plate 14 can be provided at the connection between the horizontal pipe 2 and the collection hopper 4 to improve the strength of the horizontal pipe 2 and prevent the pipe from breaking.

[0024] As can be seen from the above technical solution, in use, this application is installed at the bottom of the horizontal pipe 2 and consists of a hopper 4, a flap valve 7, a pressure transmitter 12, a hollow mesh plate 14, a high-pressure nozzle assembly 13, and a controller 11. When ash accumulates in the horizontal pipe 2, the pressure transmitter 12 detects a change in the pipe wind speed, and the controller 11 sends a signal to the solenoid valve 9 to operate. Compressed air is sprayed at high speed through the high-pressure nozzle assembly 13 arranged on site. The impact force breaks the ash layer at the bottom of the horizontal pipe 2, causing the ash in front of the hopper 4 in the horizontal pipe 2 to be loosened by the external force of the spray. Some fine particles enter the dynamic classifier 1 with the wind speed, while other coarse ash particles move forward to the hopper 4 under the influence of the wind speed. When the coarse particles accumulate in the hopper 4, and the material in the hopper 4 accumulates to a certain amount, the flap valve 7 automatically opens to discharge the material. The material is sent to the conveying pipe through the discharge nozzle 8 and re-enters the roller elevator, which then conveys it to the grinding stage to achieve re-grinding of the coarse powder. After discharge, the flap valve automatically resets.

[0025] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope of this application is indicated by the claims.

[0026] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The embodiments of this application described above do not constitute a limitation on the scope of protection of this application.

Claims

1. An automatic dust removal device for a classifier pipeline, comprising a horizontal pipeline (2) installed between a dynamic classifier (1) and a V-type classifier (3), characterized in that: A material collection hopper (4) is installed at the bottom of the horizontal pipe (2). The material collection hopper (4) and the horizontal pipe (2) are connected. A discharge structure is installed at the bottom of the material collection hopper (4). The horizontal pipe (2) is also equipped with a high-pressure nozzle assembly (13). The high-pressure nozzle assembly (13) is located between the V-type classifier (3) and the material collection hopper (4). The high-pressure nozzle assembly (13) is connected to a high-pressure gas structure. A pressure transmitter (12) is also installed at the location where the high-pressure nozzle assembly (13) is installed in the horizontal pipe (2). The pressure transmitter (12) and the high-pressure gas structure are both controlled by a controller (11).

2. The automatic dust removal device for air classifier pipelines according to claim 1, characterized in that, The discharge structure includes a discharge pipe (5) installed at the bottom of the collection hopper (4), a discharge nozzle (8) installed at the bottom of the discharge pipe (5), and a flap valve (7) provided between the discharge pipe (5) and the discharge nozzle (8).

3. The automatic dust removal device for the air classifier pipeline according to claim 2, characterized in that, The flap valve (7) is a non-powered flap valve.

4. The automatic dust removal device for the air classifier pipeline according to claim 2, characterized in that, A maintenance window (6) is also provided on one side of the discharge pipe (5).

5. The automatic dust removal device for the air classifier pipeline according to claim 2, characterized in that, The bottom of the discharge nozzle (8) is equipped with a mill inlet elevator.

6. The automatic dust removal device for air classifier pipelines according to claim 1, characterized in that, The high-pressure gas structure is an air pump (10), which is connected to the high-pressure nozzle assembly (13) through a high-pressure pipeline, and a solenoid valve (9) is installed on the high-pressure pipeline.

7. The automatic dust removal device for air classifier pipelines according to claim 6, characterized in that, The high-pressure nozzle assembly (13) is a bidirectional nozzle.

8. The automatic dust removal device for air classifier pipelines according to claim 6, characterized in that, The high-pressure nozzle assembly (13) consists of multiple units, which are arranged at equal intervals along the arc direction of the horizontal pipe (2).

9. The automatic dust removal device for air classifier pipelines according to claim 6, characterized in that, The nozzle of the high-pressure nozzle assembly (13) emits a cone-shaped, scattering spray.

10. The automatic dust removal device for air classifier pipelines according to claim 1, characterized in that, A hollow grid plate (14) is also provided at the connection between the horizontal pipe (2) and the collection hopper (4).

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