A control cabinet for a mill suitable for high dust environments

Abstract

The application relates to the technical field of industrial equipment protection, in particular to a flour mill control cabinet suitable for a high-dust environment; the technical scheme is as follows: a flour mill control cabinet suitable for a high-dust environment, which comprises a cabinet body, a positive pressure dustproof system, an intelligent control module and a dust discharging and pressure releasing system; the application can continuously extract air from the outside, filters the air layer by layer, and forcibly sends the purified air into the sealed cabinet body at a pressure slightly higher than that of the outside environment, so that a small positive pressure is continuously maintained in the cabinet, an outward airflow barrier is formed at all gaps, the infiltration of external dust-containing air is prevented, meanwhile, the cold air flows in the cabinet, carries away the heat generated by electrical elements, and is discharged through the bottom treatment structure, so that the risk of short circuit, insulation drop or signal interference caused by dust and heat accumulation is reduced, and the reliability and service life of the whole flour mill control cabinet are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of industrial equipment protection technology, and in particular to a control cabinet for a grinding mill suitable for high-dust environments. Background Technology

[0002] In industries such as mining, cement plants, and metallurgy, grinding mills are important production equipment, and their control cabinets are usually installed in environments with high dust concentrations.

[0003] Existing control cabinets for grinding mills used in high-dust environments are typically sealed by increasing the cabinet's sealing level and adding simple ventilation filters. However, to prevent dust from entering, the cabinet needs to be as enclosed as possible, which severely hinders the dissipation of heat generated by the operation of internal electrical components, causing the internal temperature to rise continuously. On the other hand, if ventilation openings or fans are added for heat dissipation, dust can easily intrude. Once dust enters the cabinet, it will gradually accumulate on critical parts such as circuit boards and terminals, which may not only cause electrical faults such as short circuits and leakage, but also form a heat insulation layer on the surface of components, further reducing the heat dissipation effect.

[0004] To address the aforementioned issues, this solution continuously draws air from the outside, filters it through multiple layers, and forces the purified air into the sealed cabinet at a pressure slightly higher than the ambient temperature. This maintains a constant positive pressure inside the cabinet, creating an outward-blowing airflow barrier at all gaps, preventing the infiltration of dusty external air. Simultaneously, the cool air flowing within the cabinet carries away the heat generated by the electrical components and is discharged through the bottom processing structure. This reduces the risk of short circuits, insulation degradation, or signal interference caused by dust and heat accumulation, significantly improving the reliability and service life of the entire grinding mill control cabinet. Summary of the Invention

[0005] To overcome the challenges of existing grinding mill control cabinets used in high-dust environments, the sealing level of the cabinet is usually improved and a simple ventilation filter is installed for sealing. However, in order to prevent dust from entering, the cabinet needs to be as closed as possible, which severely hinders the dissipation of heat generated by the operation of internal electrical components, causing the temperature inside the cabinet to rise continuously. If ventilation openings or fans are added for heat dissipation, dust can easily intrude. Once dust enters the cabinet, it will gradually accumulate on critical parts such as circuit boards and terminals, which may not only cause electrical faults such as short circuits and leakage, but also form a heat insulation layer on the surface of components, further reducing the heat dissipation effect.

[0006] The technical solution of this invention is: a control cabinet for a grinding mill suitable for high-dust environments, comprising: The cabinet has a sealed chamber inside that houses electrical components. The cabinet is made of double-layer steel plates welded together, with a layer of sound-absorbing and heat-insulating material filling the space between the two layers. A cabinet door is located on one side of the cabinet, and an inflatable sealing strip is installed on the side of the door. The inflatable sealing strip is distributed in a ring. A miniature air pump is installed on the top of the cabinet and is connected to the inflatable sealing strip. An active positive pressure dust suppression system is installed at the top of the cabinet. The active positive pressure dust suppression system is used to continuously supply filtered clean air into the cabinet. The active positive pressure dust suppression system includes an air inlet louver, a primary coarse filter, a centrifugal fan, an electrostatic dust removal module, a drying and cooling module, and an air outlet distribution chamber connected in sequence. Multiple sets of air supply nozzles are installed on the top surface of the cabinet, and the air supply nozzles are connected to the air outlet distribution chamber. The intelligent control module includes a pressure sensor group, a dust concentration sensor, a temperature sensor, a humidity sensor, and an embedded controller. The embedded controller is used to receive signals from the sensors and dynamically adjust the speed of the centrifugal fan, the operating voltage of the electrostatic precipitator module, and the operating power of the drying and cooling module based on preset algorithms. The dust removal and pressure relief system is located at the bottom of the cabinet. The system includes a dust collection funnel and a one-way pressure relief valve. A miniature negative pressure vacuum cleaner that operates periodically is installed at the bottom of the dust collection funnel. The one-way pressure relief valve automatically opens to release pressure when the internal pressure of the cabinet exceeds a preset safety threshold.

[0007] As a preferred option, the active positive pressure dust suppression system also includes: The electrostatic dust removal module also includes: A11: High-voltage ionization zone. The high-voltage ionization zone consists of a set of tungsten steel discharge wires and grounded aluminum dust collection plates arranged in parallel and alternating order. It is used to charge dust particles in the airflow. A12: The honeycomb dust collection area consists of multiple regular hexagonal honeycomb ceramic channels with a titanium dioxide photocatalytic coating on the surface. Each channel has a bias electrode plate with the opposite polarity to the high-voltage ionization area on its inner wall, which is used to adsorb charged dust particles. The drying and cooling module also includes a semiconductor cooling chip assembly and a rotary dehumidifier for removing moisture from the cabinet.

[0008] Preferably, the embedded controller in the intelligent control system includes the following steps when it is in operation: S11: Based on the pressure difference inside and outside the cabinet detected by the pressure sensor group, the speed of the stepless speed-regulating motor of the centrifugal fan is adjusted by the PID algorithm to stabilize the pressure difference within the set range. S12: Accumulate and calculate the approximate dust load passing through the electrostatic precipitator module, and combine it with the change in the pressure difference across its two ends to predict the degree of filter material clogging. When the preset threshold is reached, a maintenance warning is issued. S13: Based on the readings of the temperature and humidity sensors, and combined with the operating status signal of the grinding mill main unit, independently adjust the power of the semiconductor cooling chip group and the rotation speed of the rotary desiccant to ensure that the dew point temperature inside the control cabinet is always at least 5°C lower than the surface temperature of the lowest component inside the cabinet.

[0009] Preferably, the inner side of the cabinet is covered with an electromagnetic shielding liner, which is made of conductive cloth and high-permeability ferrite composite material.

[0010] Preferably, the air supply nozzles are of a venturi structure with an adjustable throat cross-sectional area. The air supply direction of multiple air supply nozzles is optimized through fluid dynamics simulation to cover the surface of all heat-generating electrical components with clean airflow and form an orderly laminar or weakly turbulent flow field.

[0011] Preferably, the primary coarse filter is a quick-detachable metal frame primary filter, and the honeycomb dust collection area of ​​the electrostatic dust removal module is equipped with a programmable high-voltage pulse cleaning circuit, which applies reverse high-voltage pulses to the bias electrode plate at a variable frequency and voltage according to the dust load, causing the adsorbed dust to fall off.

[0012] As a preferred option, all exposed sheet metal joints, screw holes, and cable entry points of the cabinet are coated with a flexible, long-lasting, corrosion-resistant sealant.

[0013] Preferably, the outer surface of the cabinet is coated with a wear-resistant epoxy coating with anti-static properties.

[0014] Preferably, the embedded controller of the intelligent control system can upload historical operating data, fault records, early warning information and maintenance cycle suggestions to a cloud server or local monitoring host through its wireless communication module, and can receive remote setting parameter modification commands or execute emergency stop commands.

[0015] As a preferred option, the bottom of the cabinet is equipped with support legs.

[0016] The beneficial effects of this invention are: Existing control cabinets for grinding mills used in high-dust environments typically achieve sealing by increasing the cabinet's airtightness and adding simple ventilation filters. However, to prevent dust from entering, the cabinet needs to be as enclosed as possible, severely hindering the dissipation of heat generated by internal electrical components, leading to a continuous rise in the cabinet's internal temperature. Conversely, if ventilation openings or fans are added for heat dissipation, dust can easily intrude. Once inside the cabinet, dust gradually accumulates on critical components such as circuit boards and terminals, potentially causing electrical faults such as short circuits and leakage. Furthermore, the dust covering the component surfaces forms a heat insulation layer, further reducing heat dissipation efficiency. This solution continuously draws air from the outside, filters it through multiple layers, and forces the purified air into the sealed cabinet at a pressure slightly higher than the external environment. This maintains a constant positive pressure inside the cabinet, creating an outward-blowing airflow barrier at all gaps, preventing the infiltration of dusty external air. At the same time, the cool air flows inside the cabinet, carrying away the heat generated by the electrical components and discharging it through the bottom treatment structure. This reduces the risk of short circuits, insulation degradation, or signal interference caused by dust and heat accumulation, thus significantly improving the reliability and service life of the entire grinding mill control cabinet. Attached Figure Description

[0017] Figure 1 The diagram shown is a first three-dimensional structural schematic of a grinding mill control cabinet suitable for high dust environments according to the present invention. Figure 2 The diagram shown is a second three-dimensional structural schematic of a grinding mill control cabinet suitable for high-dust environments according to the present invention. Figure 3 The diagram shown is a first internal three-dimensional structural diagram of a grinding mill control cabinet suitable for high dust environments according to the present invention. Figure 4 The diagram shown is a three-dimensional internal structure of a grinding mill control cabinet suitable for high-dust environments according to the present invention. Figure 5 The diagram shown is a partial three-dimensional structural schematic of a grinding mill control cabinet suitable for high dust environments according to the present invention. Figure 6 The diagram shown is a partial plan view of a grinding mill control cabinet suitable for high-dust environments according to the present invention. Explanation of reference numerals in the attached diagram: 1. Cabinet body; 11. Cabinet door; 12. Inflatable sealing strip; 13. Miniature air pump; 14. Electromagnetic shielding liner; 2. Active positive pressure dustproof system; 21. Air inlet louvers; 22. Primary coarse filter; 23. Centrifugal fan; 24. Electrostatic dust removal module; 25. Drying and cooling module; 26. Air outlet diversion chamber; 27. Air supply nozzle; 3. Intelligent control module; 4. Dust removal and pressure relief system; 41. Dust collection funnel; 42. One-way pressure relief valve; 43. Miniature negative pressure vacuum cleaner; 5. Support legs. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Please see Figure 1-6 The present invention provides an embodiment: a control cabinet for a grinding mill suitable for high-dust environments, comprising: Cabinet 1 has a sealed chamber inside that houses electrical components. Cabinet 1 is made of double-layer steel plates welded together. The space between the double-layer steel plates of cabinet 1 is filled with a layer of sound-absorbing and heat-insulating material. One side of cabinet 1 is provided with a cabinet door 11. The side of cabinet door 11 is provided with an inflatable sealing strip 12. The inflatable sealing strip 12 is distributed in a ring. The top surface of cabinet 1 is provided with a miniature air pump 13, which is connected to the inflatable sealing strip 12. Active positive pressure dustproof system 2 is installed on the top of cabinet 1. Active positive pressure dustproof system 2 is used to continuously provide filtered clean air to the inside of cabinet 1. Active positive pressure dustproof system 2 includes an air inlet louver 21, a primary coarse filter 22, a centrifugal fan 23, an electrostatic dust removal module 24, a drying and cooling module 25, and an air outlet diversion chamber 26 connected in sequence. Multiple sets of air supply nozzles 27 are provided on the inner top surface of cabinet 1. The air supply nozzles 27 are connected to the air outlet diversion chamber 26. The intelligent control module 3 includes a pressure sensor group, a dust concentration sensor, a temperature sensor, a humidity sensor, and an embedded controller. The embedded controller is used to receive signals from the sensors and dynamically adjust the speed of the centrifugal fan 23, the working voltage of the electrostatic dust removal module 24, and the operating power of the drying and cooling module according to the preset algorithm. The dust removal and pressure relief system 4 is installed at the bottom of the cabinet 1. The dust removal and pressure relief system 4 includes a dust collection funnel 41 and a one-way pressure relief valve 42. A miniature negative pressure vacuum cleaner 43 that works periodically is installed at the bottom of the dust collection funnel 41. The one-way pressure relief valve 42 automatically opens to relieve pressure when the internal pressure of the cabinet 1 exceeds a preset safety threshold.

[0020] As a preferred embodiment, the active positive pressure dust suppression system 2 also includes: The electrostatic dust removal module 24 also includes: A11: High-voltage ionization zone. The high-voltage ionization zone consists of a set of tungsten steel discharge wires and grounded aluminum dust collection plates arranged in parallel and alternating order. It is used to charge dust particles in the airflow. A12: The honeycomb dust collection area consists of multiple regular hexagonal honeycomb ceramic channels with a titanium dioxide photocatalytic coating on the surface. Each channel has a bias electrode plate with the opposite polarity to the high-voltage ionization area on its inner wall, which is used to adsorb charged dust particles. The drying and cooling module 25 also includes a semiconductor cooling chip assembly and a rotary dehumidifier for removing moisture from the cabinet 1.

[0021] Preferably, the embedded controller in the intelligent control system 3 includes the following steps when it is in operation: S11: Based on the pressure difference inside and outside the cabinet detected by the pressure sensor group, the speed of the stepless speed-regulating motor of the centrifugal fan 23 is adjusted by the PID algorithm to stabilize the pressure difference within the set range. S12: Accumulate and calculate the approximate dust load passing through the electrostatic dust removal module 24, and combine it with the pressure difference change at both ends to predict the degree of filter material blockage. When the preset threshold is reached, a maintenance warning is issued. S13: Based on the readings of the temperature and humidity sensors, and combined with the operating status signal of the grinding mill main unit, independently adjust the power of the semiconductor cooling chip group and the rotation speed of the rotary desiccant to ensure that the dew point temperature inside the control cabinet is always at least 5°C lower than the surface temperature of the lowest component inside the cabinet.

[0022] Preferably, the inner side of the cabinet 1 is provided with an electromagnetic shielding liner 14, which is made of conductive cloth and high magnetic permeability ferrite composite material.

[0023] Preferably, the air supply nozzle 27 has a venturi structure with an adjustable throat cross-sectional area. The air supply direction of the multiple air supply nozzles 27 is optimized through fluid dynamics simulation to cover the surface of all heat-generating electrical components with clean airflow and form an orderly laminar or weakly turbulent flow field.

[0024] Preferably, the primary coarse filter 22 is a quick-detachable metal frame primary filter, and the honeycomb dust collection area of ​​the electrostatic dust removal module 24 is equipped with a programmable high-voltage pulse cleaning circuit, which applies reverse high-voltage pulses to the bias electrode plate at a variable frequency and voltage according to the dust load, so that the adsorbed dust falls off.

[0025] Preferably, all exposed sheet metal joints, screw holes and cable entry points of cabinet 1 are coated with elastic, long-lasting, corrosion-resistant sealant.

[0026] Preferably, the outer surface of cabinet 1 is coated with a wear-resistant epoxy coating with anti-static function.

[0027] Preferably, the embedded controller of the intelligent control system 3 can upload historical operating data, fault records, early warning information and maintenance cycle suggestions to the cloud server or local monitoring host through its wireless communication module, and can receive remote setting parameter modification instructions or execute emergency stop instructions.

[0028] As a preferred option, the bottom surface of the cabinet 1 is provided with supporting legs 5.

[0029] Example 1 In the grinding workshop of a large ore processing plant, the working environment is filled with fine mineral dust. The dust can easily penetrate ordinary electrical equipment and cause malfunctions. In order to solve this problem, the workshop decided to install a grinding mill control cabinet for high dust environments.

[0030] The installers first placed the control cabinet 1 securely on the ground near the grinding mill using the bottom support brackets 5. Then, they connected the external power cord and all control signal lines, ensuring that all cable entry points were tightly sealed with elastic, long-lasting, corrosion-resistant sealant. After installation, the entire system was started.

[0031] Once the device starts operating, the active positive pressure dustproof system 2 immediately begins operation. External air first enters through the air inlet louvers 21, passes through the quick-removable primary coarse filter 22, and removes larger particles. Then, the centrifugal fan 23 starts operating, pushing the air into the subsequent purification process. The air then passes through the electrostatic dust removal module 24, where the high-voltage ionization zone charges the dust particles. Subsequently, the charged particles are firmly adsorbed by the honeycomb dust collection area. The air that has undergone deep dust removal continues to flow through the drying and cooling module 25, where the semiconductor cooling chip group is responsible for cooling, and the rotary dehumidifier removes excess moisture, ensuring that the air delivered into the cabinet is both clean and dry. The treated clean air is collected in the air outlet distribution chamber 26 and finally delivered into the sealed chamber inside the cabinet 1 at a specific angle and speed through multiple air delivery nozzles 27 that have been optimized by fluid dynamics.

[0032] Meanwhile, the intelligent control module 3 monitors and manages the entire process, and the embedded controller 35 reads the data from the pressure sensor group, dust concentration sensor, temperature sensor and humidity sensor in real time, and dynamically adjusts the speed of the centrifugal fan 23 to maintain the pressure inside the cabinet slightly higher than the external environment, forming an airtight barrier. At the same time, it adjusts the working mode of the electrostatic dust removal module 24 according to the cleanliness and load of the air, and controls the operating intensity of the drying and cooling module 25 to ensure that the electrical components inside the cabinet are in a suitable temperature and humidity environment. The electromagnetic shielding liner 14 laid on the inner side of the cabinet 1 effectively isolates the electromagnetic interference generated by the external motor.

[0033] At the bottom of the cabinet, even if a very small number of particles settle down due to airflow circulation, they will be collected in the dust collection funnel 41 and cleaned regularly by the mini negative pressure vacuum cleaner 43. If the pressure inside the cabinet rises abnormally for any reason, the one-way pressure relief valve 42 will open automatically.

[0034] Throughout the operation, the embedded controller continuously analyzes the data. When it predicts that the dust collection area of ​​the electrostatic dust removal module 24 may need to be cleaned, it issues a maintenance warning in advance. All operating status and warning information can be sent to the workshop monitoring room via wireless network, making it convenient for managers to remotely monitor the situation.

[0035] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A control cabinet for a grinding mill suitable for high-dust environments; characterized in that: Including: Cabinet (1), the interior of cabinet (1) is a sealed chamber for accommodating electrical components. Cabinet (1) is welded from double-layer steel plates. The double-layer steel plates of cabinet (1) are filled with a layer of sound-absorbing and heat-insulating material. A cabinet door (11) is provided on one side of cabinet (1). An inflatable sealing strip (12) is provided on the side of cabinet door (11). The inflatable sealing strip (12) is distributed in a ring. A miniature air pump (13) is provided on the top surface of cabinet (1). The miniature air pump (13) is connected to the inflatable sealing strip (12). Active positive pressure dustproof system (2) is installed on the top of cabinet (1). Active positive pressure dustproof system (2) is used to continuously provide filtered clean air to the inside of cabinet (1). Active positive pressure dustproof system (2) includes an air inlet louver (21), a primary coarse filter (22), a centrifugal fan (23), an electrostatic dust removal module (24), a drying and cooling module (25), and an air outlet diversion chamber (26) connected in sequence. Multiple sets of air supply nozzles (27) are provided on the inner top surface of cabinet (1). The air supply nozzles (27) are connected to the air outlet diversion chamber (26). The intelligent control module (3) includes a pressure sensor group, a dust concentration sensor, a temperature sensor, a humidity sensor and an embedded controller. The embedded controller is used to receive signals from each sensor and dynamically adjust the speed of the centrifugal fan (23), the working voltage of the electrostatic dust removal module (24) and the operating power of the drying and cooling module according to the preset algorithm. The dust removal and pressure relief system (4) is provided at the bottom of the cabinet (1). The dust removal and pressure relief system (4) includes a dust collection funnel (41) and a one-way pressure relief valve (42). A micro negative pressure vacuum cleaner (43) that works periodically is provided at the bottom of the dust collection funnel (41). The one-way pressure relief valve (42) automatically opens to relieve pressure when the internal pressure of the cabinet (1) exceeds the preset safety threshold.

2. The control cabinet for a grinding mill suitable for high-dust environments according to claim 1, characterized in that: The active positive pressure dust control system (2) also includes: The electrostatic dust removal module (24) also includes: A11: High-voltage ionization zone. The high-voltage ionization zone consists of a set of tungsten steel discharge wires and grounded aluminum dust collection plates arranged in parallel and alternating order. It is used to charge dust particles in the airflow. A12: The honeycomb dust collection area consists of multiple regular hexagonal honeycomb ceramic channels with a titanium dioxide photocatalytic coating on the surface. Each channel has a bias electrode plate with the opposite polarity to the high-voltage ionization area on its inner wall, which is used to adsorb charged dust particles. The drying and cooling module (25) also includes a semiconductor cooling chip assembly and a rotary dehumidifier for removing moisture from the cabinet (1).

3. A mill control cabinet suitable for high-dust environments according to claim 1, characterized in that: When the embedded controller in the intelligent control system (3) is working, it includes the following steps: S11: Based on the pressure difference inside and outside the cabinet detected by the pressure sensor group, the speed of the stepless speed regulating motor of the centrifugal fan (23) is adjusted by the PID algorithm to stabilize the pressure difference within the set range; S12: Accumulate the approximate dust load passing through the electrostatic dust removal module (24), and combine it with the change in the pressure difference between its two ends to predict the degree of filter material blockage. When the preset threshold is reached, a maintenance warning is issued. S13: Based on the readings of the temperature and humidity sensors, and combined with the operating status signal of the grinding mill main unit, independently adjust the power of the semiconductor cooling chip group and the rotation speed of the rotary desiccant to ensure that the dew point temperature inside the control cabinet is always at least 5°C lower than the surface temperature of the lowest component inside the cabinet.

4. A mill control cabinet suitable for high-dust environments according to claim 1, characterized in that: The inner side of the cabinet (1) is covered with an electromagnetic shielding liner (14), which is made of conductive cloth and high permeability ferrite composite material.

5. A mill control cabinet suitable for high-dust environments according to claim 1, characterized in that: The air supply nozzle (27) has a venturi structure and its throat cross-sectional area is adjustable. The air supply direction of multiple air supply nozzles (27) is optimized by fluid dynamics simulation to cover the surface of all heat-generating electrical components with clean airflow and form an orderly laminar or weak turbulent flow field.

6. A grinding mill control cabinet suitable for high-dust environments according to claim 1, characterized in that: The primary coarse filter (22) is a quick-detachable metal frame primary filter. The honeycomb dust collection area of ​​the electrostatic dust removal module (24) is equipped with a programmable high-voltage pulse cleaning circuit, which applies a reverse high-voltage pulse to the bias electrode plate at a variable frequency and voltage according to the dust load, so that the adsorbed dust falls off.

7. A mill control cabinet suitable for high-dust environments according to claim 1, characterized in that: All exposed sheet metal joints, screw holes and cable entry points of the cabinet (1) are coated with elastic, long-lasting anti-corrosion sealant.

8. A mill control cabinet suitable for high-dust environments according to claim 1, characterized in that: The outer surface of the cabinet (1) is coated with a wear-resistant epoxy coating with anti-static function.

9. A mill control cabinet suitable for high-dust environments according to claim 1, characterized in that: The embedded controller of the intelligent control system (3) can upload historical data, fault records, early warning information and maintenance cycle suggestions to the cloud server or local monitoring host through the wireless communication module, and can receive setting parameter modification instructions or execute emergency stop instructions from the remote location.

10. A grinding mill control cabinet suitable for high-dust environments according to claim 1, characterized in that: The bottom surface of the cabinet (1) is provided with support legs (5).

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