Purging system and method for closed space coal conveying belt conveyor roller

Abstract

The invention relates to a purging system and method for a roller of a coal conveying belt conveyor in a closed space, the purging system comprises an air source supply unit, a purging pipeline unit and a control unit, the purging pipeline unit is arranged in a closed housing where the coal conveying belt conveyor is located, the air source supply unit is connected with the purging pipeline unit, and the control unit is connected with the purging pipeline unit. The blowing pipeline unit is used for providing an air source for the blowing pipeline unit, the blowing pipeline unit executes blowing action on the roller in the closed housing, and the control unit is connected with the blowing pipeline unit and used for controlling and adjusting the working state of the blowing pipeline unit according to the real-time operation state information of the roller. Compared with the prior art, the rotary drum cleaning device can effectively, reliably and comprehensively clean the rotary drum in the closed space, and the phenomena of dust accumulation and coal wrapping are prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of power plant equipment, and particularly to a purging system and method for a coal conveying belt roller in a confined space. Background Art

[0002] The coal conveying belt is a commonly used transportation equipment in power plants, cement plants, coal mines and other places, which is used to support and convey materials such as coal. It usually consists of a conveying belt, a driving device, a bracket, a roller, etc. Through a driving device, such as a motor or a reducer, the coal conveying belt can convey coal from one place to another, so as to achieve continuous material transportation.

[0003] Considering environmental protection and noise problems during the coal conveying process, the prior art designs a closed coal conveying belt to reduce dust floating in the air and cause pollution, and at the same time can reduce noise to a certain extent. However, when the roller of the coal conveying belt works in a confined space, due to the transportation characteristics of coal, a large amount of coal powder dust will be generated, and these dusts are easy to accumulate on the roller; moreover, in some cases, coal may adhere to the surface of the roller to form a coal wrapping phenomenon. This will not only affect the normal rotation of the roller, increase the running resistance of the roller, but also cause problems such as belt deviation and increased wear, thereby reducing the working efficiency and service life of the coal conveying belt.

[0004] Traditional cleaning methods are often difficult to effectively solve the problems of ash accumulation and coal wrapping on the roller in a confined space, and have disadvantages such as incomplete cleaning, inconvenient operation and possible damage to equipment. Chinese Patent CN203143617U proposes a cleaning device for the tail roller of a coal conveying belt, which is designed to install a fixed cleaning plate on the right side of the roller, and a movable scraper is placed on the fixed cleaning plate. The fixed cleaning plate plays the role of cleaning the coal sludge on the surface of the roller and collecting the coal sludge. In addition, the movable scraper is reciprocally pulled manually to scrape the coal collected on the fixed cleaning plate to the ground. Chinese Patent CN115610953A further proposes an automatic cleaning and residue collection device for the tail roller of a coal conveying belt, which is designed to use a controller to adjust the distance between the scraping blade and the barrel wall of the roller, and also uses the scraping blade to remove the materials adhered to the roller. However, the method of cleaning the roller through the cleaning plate is difficult to ensure the cleaning effect, and the cleaning plate itself is also prone to ash accumulation and coal wrapping, which is not conducive to comprehensively cleaning the roller stably and reliably. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above-mentioned defects existing in the prior art and provide a purging system and method for a coal conveying belt roller in a confined space, which can effectively and reliably comprehensively clean the roller in the confined space and prevent ash accumulation and coal wrapping.

[0006] The object of the present invention can be achieved by the following technical solutions: A purging system for the roller of a coal conveying belt conveyor in a confined space, comprising a gas source supply unit, a purging pipeline unit, and a control unit. The purging pipeline unit is arranged in the enclosed housing where the coal conveying belt conveyor is located. The gas source supply unit is connected to the purging pipeline unit to supply gas to the purging pipeline unit, and the purging pipeline unit performs a purging action on the roller in the enclosed housing. The control unit is connected to the purging pipeline unit to control and adjust the working state of the purging pipeline unit according to the real-time operating state information of the roller.

[0007] Further, the gas source supply unit includes an air compressor, a gas storage tank, and a dryer. The air compressor is used to compress the external air and store it in the gas storage tank. The dryer is used to filter and dry the compressed air, and the output end of the dryer is connected to the purging pipeline unit.

[0008] Further, a ball valve is connected to the dryer for discharging water and sewage.

[0009] Further, the purging pipeline unit includes a main pipeline and a plurality of branch pipelines connected thereto. The main pipeline is connected to the dryer through an electromagnetic valve. The ends of the branch pipelines are provided with purging nozzles with adjustable directions. The electromagnetic valve and the purging nozzles are respectively connected to the control unit.

[0010] Further, the plurality of branch pipelines are evenly distributed around the circumferential direction and the axial direction of the roller.

[0011] Further, the control unit is connected to a sensor unit. The sensor unit is used to collect the operating state information of the roller and transmit it to the control unit.

[0012] Further, the operating state information of the roller includes rotational speed and temperature.

[0013] Further, the sensor unit includes a rotational speed sensor and a temperature sensor. The rotational speed sensor is installed at the shaft end of the roller, and the temperature sensor is installed on the surface of the roller.

[0014] A purging method for the roller of a coal conveying belt conveyor in a confined space includes the following process:

[0015] According to the real-time operating state information of the roller, the control unit determines whether a purging action needs to be performed. If the determination is yes, the control unit controls to open the electromagnetic valve, so that the compressed air in the gas storage tank flows into the main pipeline and each branch pipeline through the dryer, and sprays out from the purging nozzles at the ends of each branch pipeline. Synchronously, the control unit controls to adjust the outlet directions of each purging nozzle, and uses the airflow to blow off and remove the dust and coal wrapped on the surface of the roller.

[0016] Furthermore, the process by which the control unit determines whether a purging action needs to be performed is as follows:

[0017] Compare the real-time rotational speed of the drum with the rated rotational speed, and compare the real-time surface temperature of the drum with the initial temperature. If the real-time rotational speed of the drum is lower than 80% of the rated rotational speed and the real-time surface temperature has increased by more than 5°C compared to the initial temperature, it is determined that a purging action needs to be performed.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] In the present invention, a purging pipeline unit is arranged inside the sealed housing where the coal conveying belt conveyor is located, and the purging pipeline unit is connected to the gas source supply unit. The gas source supply unit provides gas to the purging pipeline unit, and then the purging pipeline unit performs a purging action on the drum inside the sealed housing. In addition, a control unit is designed to be connected to the purging pipeline unit, so as to be able to correspondingly control and adjust the working state of the purging pipeline unit. Thus, a solution capable of automatically and controllably purging the drum of the coal conveying belt conveyor in a sealed space is realized, and the problems of dust accumulation and coal wrapping on the drum in the sealed space can be effectively solved.

[0020] In the present invention, the gas source supply unit includes an air compressor, a gas storage tank, and a dryer. The air compressor compresses the external air and stores it in the gas storage tank, and the dryer is used to filter and dry the compressed air, which can provide a temperature and dry gas source for the purging pipeline unit, ensuring both the purging effect and not affecting the quality of the coal.

[0021] The present invention designs the purging pipeline unit to include a main pipeline and a plurality of branch pipelines connected thereto. The plurality of branch pipelines are evenly distributed around the circumferential and axial directions of the drum, and purge nozzles with adjustable directions are installed at the ends of the branch pipelines, which can perform precise and comprehensive purging treatment on the surface of the drum.

[0022] In the present invention, the control unit is connected to a sensor unit, and the sensor unit is used to collect the operating state information of the drum, so as to determine whether a purging action needs to be performed and correspondingly control the working states of the solenoid valve and the purging pipeline unit, thereby achieving the purpose of automatic and effective purging, and being able to adjust the purging time, intensity, frequency, and direction. Brief Description of the Drawings

[0023] Figure 1 is a schematic structural diagram of the purging system of the present invention;

[0024] Figure 2 is a schematic connection and installation diagram of the purging system in the embodiment;

[0025] Figure 3 is a schematic layout diagram of the purging pipeline unit in the embodiment;

[0026] Figure 4 Schematic diagram of the position of the purging nozzle of the purging pipeline unit in the embodiment;

[0027] Marking description in the figure: 1. Air source supply unit, 2. Purging pipeline unit, 3. Control unit, 11. Air compressor, 12. Air storage tank, 13. Dryer, 14. Ball valve, 21. Main pipeline, 22. Branch pipeline, 23. Solenoid valve, 24. Purging nozzle. Specific implementation mode

[0028] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Embodiment

[0030] As Figure 1 shown, a purging system for a roller of a coal conveying belt in an enclosed space includes an air source supply unit 1, a purging pipeline unit 2 and a control unit 3. Among them, the purging pipeline unit 2 is arranged in the enclosed housing where the coal conveying belt is located. The air source supply unit 1 is connected to the purging pipeline unit 2 to provide air source to the purging pipeline unit 2, and the purging pipeline unit 2 performs a purging action on the roller in the enclosed housing.

[0031] The air source supply unit 1 includes an air compressor 11, an air storage tank 12 and a dryer 13. The air compressor 11 is used to compress the external air and store it in the air storage tank 12. The dryer 13 is used to filter and dry the compressed air. The output end of the dryer 13 is connected to the purging pipeline unit 2. The control unit 1 is connected to the purging pipeline unit 2 to control and adjust the working state of the purging pipeline unit 2 according to the real-time operation state information of the roller. The purging pipeline unit 2 includes a main pipeline 21 and a plurality of branch pipelines 22 connected thereto. The main pipeline 21 is connected to the dryer 13 through a solenoid valve 23. The end of the branch pipeline 22 is provided with a purging nozzle 24 with adjustable direction. The solenoid valve 23 and the purging nozzle 24 are respectively connected to the control unit 3.

[0032] In this embodiment, since there is already a dust removal system and a dust suppression system on site, this embodiment does not need to additionally set an air compressor and an air storage tank, but directly uses the on-site equipment and only needs to add a path of air source. As Figure 2 shown, a path of air source is led out from the output end of the existing dryer on site, and a dryer 13 and a solenoid valve 23 are added to introduce the filtered and dried air into the main pipeline 21. In addition, the dryer 13 is also connected with a ball valve 14 for discharging water and sewage.

[0033] It should be noted that if there are no equipment such as air compressors and air storage tanks on site, it is necessary to add a new air compressor 111 and an air storage tank 12 and install them in appropriate positions to ensure that the air inlet of the air compressor 11 is not contaminated and well ventilated, and at the same time, it will not affect the passage of on-site personnel.

[0034] In addition, the control unit 3 is connected to a sensor unit. The sensor unit is used to collect the operating state information of the drum (including rotational speed and temperature) and transmit it to the control unit 3. The sensor unit includes a rotational speed sensor and a temperature sensor. The rotational speed sensor is installed at the shaft end of the drum, and the temperature sensor is installed on the surface of the drum. The control unit 3 accordingly controls and adjusts the operating states of the solenoid valve 23 and the purge nozzles 24 based on the real-time operating state information of the drum.

[0035] When actually building the purge system proposed in this solution, first connect the main pipeline 21 to the air storage tank 12, and a plurality of branch pipelines 22 are evenly distributed around the circumferential and axial directions of the drum (as Figure 3 and Figure 4 shown). Purge nozzles 24 are correspondingly arranged on the branch pipelines 22, and the outlet directions of the purge nozzles 24 can be adjusted, so as to facilitate accurately aligning different positions on the surface of the drum for purging. The distance between the branch pipelines 22 and the surface of the drum is set within a suitable range according to the size of the drum and the working environment, generally 5 - 10 centimeters. Then install the sensor unit, install the rotational speed sensor at the shaft end of the drum, and install the temperature sensor at a position near the edge on the surface of the drum to ensure that the sensors can accurately obtain the operating state information of the drum.

[0036] The purging method of the above-mentioned purge system includes the following process:

[0037] Based on the real-time operating state information of the drum, the control unit 3 determines whether a purging action needs to be performed. If the determination is yes, the control unit 3 controls to open the solenoid valve 23, so that the compressed air in the air storage tank 12 flows into the main pipeline 21 and each branch pipeline 22 through the dryer 13, and is ejected from the purge nozzles 24 at the ends of each branch pipeline 22. At the same time, the control unit 3 controls and adjusts the outlet directions of each purge nozzle 24, and uses the airflow to blow off and remove the dust and coal wrapping on the surface of the drum.

[0038] Among them, the process for the control unit 3 to determine whether a purging action needs to be performed is:

[0039] Compare the real-time rotational speed of the drum with the rated rotational speed, and compare the real-time surface temperature of the drum with the initial temperature. If the real-time rotational speed of the drum is lower than 80% of the rated rotational speed and the real-time surface temperature has increased by more than 5°C compared to the initial temperature, it is determined that a purging action needs to be performed.

[0040] In this embodiment, a Programmable Logic Controller (PLC) is used as the control unit 3. According to the information fed back by the sensor unit, the solenoid valve in the purging system is controlled by the PLC, thereby adjusting the purging time, intensity, and frequency.

[0041] In this embodiment, initial purging parameters are set in the PLC. When the roller speed is lower than 80% of the normal speed and the temperature rises by 5°C, the purging operation starts. The initial purging intensity is set to 0.5 MPa, the purging time interval is 10 minutes, and the duration of each purging is 30 seconds. According to the actual operating conditions, the parameters can also be adjusted through the human-machine interface of the PLC. For example, in the case of relatively high coal humidity, the purging intensity and frequency are appropriately increased.

[0042] During the specific operation process, when the roller starts to work, the sensor transmits the operating parameters of the roller to the PLC. The PLC determines whether purging is required according to the preset program. If purging is required, the PLC opens the solenoid valve, and the compressed air in the gas storage tank is ejected from the purging nozzle at high speed through the main pipeline and branch pipelines. The high-speed air flow blows the dust accumulated on the roller surface away. For the phenomenon of coal wrapping, the angle of the purging nozzle and the purging intensity can also be adjusted to remove the wrapped coal by using the impact force and shear force of the air flow.

[0043] In addition, during the purging process, the PLC can dynamically adjust the purging parameters according to the data fed back by the sensor in real time to achieve the best purging effect, while avoiding damage to the roller and belt caused by excessive purging.

[0044] During operation and maintenance, when the coal conveyor belt is operating normally, the above purging system operates automatically according to the set program. On the one hand, the air compressor is regularly maintained, and the pressure safety device of the gas storage tank is checked to ensure the stability and safety of the gas source supply. On the other hand, the purging pipeline unit is inspected, impurities that may exist in the pipeline are cleaned, whether the purging nozzle is blocked or damaged is checked, and if there is a problem, it is replaced in time. The drying system is drained regularly to ensure the safety and stability of the gas source supply.

[0045] In summary, through the enclosed space coal conveyor belt roller purging system proposed in this solution, the problems of dust accumulation and coal wrapping on the roller can be effectively solved, the operating stability and working efficiency of the coal conveyor belt can be improved, and the service life of the equipment can be extended. In addition, the structure of this purging system is simple, the operability is high, the applicable range is large, and the cost is low; it can effectively avoid the abnormal damage of the conveyor belt caused by dust during operation in the enclosed space, increase the service life of the conveyor belt, and improve economic benefits; and it is convenient for maintenance operations, effectively reduces the frequency of maintenance personnel replacing the conveyor belt, and reduces the loss of labor costs.

Claims

1. A purging system for the roller of a coal conveying belt conveyor in a confined space, characterized in that, It includes an air source supply unit (1), a purging pipeline unit (2) and a control unit (3). The purging pipeline unit (2) is arranged inside the closed housing where the coal conveying belt is located. The air source supply unit (1) is connected to the purging pipeline unit (2) to provide air source to the purging pipeline unit (2), and the purging pipeline unit (2) performs a purging action on the rollers inside the closed housing. The control unit (3) is connected to the purging pipeline unit (2) to control and adjust the working state of the purging pipeline unit (2) according to the real-time operating state information of the rollers.

2. The purging system for the roller of a coal conveying belt in a confined space according to claim 1, wherein The air source supply unit (1) includes an air compressor (11), a gas storage tank (12) and a dryer (13). The air compressor (11) is used to compress the outside air and store it in the gas storage tank (12). The dryer (13) is used to filter and dry the compressed air. The output end of the dryer (13) is connected to the purging pipeline unit (2).

3. The purging system for the roller of the coal conveying belt conveyor in a confined space according to claim 2, wherein The dryer (13) is connected with a ball valve (14) for discharging water and sewage.

4. A purging system for a roller of a coal conveying belt in a confined space according to claim 2, characterized in that, The purging pipeline unit (2) includes a main pipeline (21) and a plurality of branch pipelines (22) connected thereto. The main pipeline (21) is connected to the dryer (13) through a solenoid valve (23). The ends of the branch pipelines (22) are installed with purging nozzles (24) with adjustable directions. The solenoid valve (23) and the purging nozzles (24) are respectively connected to the control unit (3).

5. A purging system for a roller of a coal conveying belt in a confined space according to claim 4, characterized in that, The plurality of branch pipelines (22) are evenly distributed in the circumferential direction and the axial direction of the roller.

6. The purging system for the roller of a coal conveying belt in a confined space according to claim 1, wherein The control unit (3) is connected with a sensor unit. The sensor unit is used to collect the operating state information of the roller and transmit it to the control unit (3).

7. A purging system for a roller of a coal conveying belt conveyor in a confined space according to claim 6, characterized in that, The operating state information of the roller includes rotational speed and temperature.

8. A purging system for a coal conveying belt roller in a confined space according to claim 7, characterized in that, The sensor unit includes a rotational speed sensor and a temperature sensor. The rotational speed sensor is installed at the shaft end of the roller, and the temperature sensor is installed on the surface of the roller.

9. A purging method for the roller of a coal conveying belt conveyor in a confined space, applied to the purging system as described in claim 4, characterized in that, It includes the following process: According to the real-time operating state information of the roller, the control unit (3) judges whether a purging action needs to be performed. If the judgment is yes, the control unit (3) controls to open the solenoid valve (23), so that the compressed air in the gas storage tank (12) flows into the main pipeline (21) and each branch pipeline (22) through the dryer (13), and sprays out from the purging nozzles (24) at the ends of each branch pipeline (22). Synchronously, the control unit (3) controls and adjusts the outlet directions of the purging nozzles (24), and uses the air flow to blow off and remove the dust and coal wrapping on the surface of the roller.

10. A purging method for a roller of a coal conveying belt conveyor in a confined space according to claim 9, characterized in that, The process for the control unit (3) to judge whether a purging action needs to be performed is as follows: Compare the real-time rotational speed of the roller with the rated rotational speed, and compare the real-time surface temperature of the roller with the initial temperature. If the real-time rotational speed of the roller is lower than 80% of the rated rotational speed and the real-time surface temperature has increased by more than 5°C compared with the initial temperature, it is judged that a purging action needs to be performed.

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