Exhaust method for butt joint of cleaning equipment and strong exhaust duct system

Abstract

The invention relates to an exhaust method for a cleaning equipment butt joint strong exhaust duct system in the field of cleaning and exhaust, wind pressure sensors are arranged at an inlet, a middle section and an outlet of an exhaust duct, real-time wind pressure data are obtained at the collection frequency of one time per second, wind pressure changes can be accurately and comprehensively monitored, an accurate basis is provided for follow-up air volume regulation and control, and the service life of the cleaning equipment butt joint strong exhaust duct system is prolonged. Therefore, the problem of improper air volume control caused by inaccurate air pressure monitoring is effectively solved, the stability of the exhaust effect of the cleaning equipment is guaranteed, in the frequency regulation and control process of the exhaust motor, if the change amplitude of the air pressure of the strong exhaust duct system exceeds 0.8 kPa within one second, the control unit can timely close the exhaust motor, and the control unit is started. According to the method, the air pressure is reduced, restarting is conducted after the air pressure returns to normal, meanwhile, the recovered operation parameters are recorded, the measure effectively avoids out-of-control of the extracted air volume caused by severe fluctuation of the air pressure, the fault-tolerant capability and stability of the system are enhanced, the cleaning effect is further improved, and long-term stable operation of cleaning equipment is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of information technology, in particular to the field of cleaning equipment exhaust design, and specifically to an exhaust method for cleaning equipment to be connected to a strong exhaust duct system. Background Art

[0002] There is a technical problem when the cleaning equipment is connected to the strong exhaust duct system. The wind pressure of the strong exhaust duct system in the workshop and factory is unstable, sometimes large and sometimes small, which makes the exhaust effect of the cleaning equipment unable to be guaranteed. When the wind pressure is too high, the extraction air volume of the cleaning equipment will be too large, affecting the cleaning effect; when the wind pressure is too low, the extraction air volume will be insufficient, and the cleaning effect cannot be guaranteed. In addition, the fluctuation of wind pressure will also affect the stability and reliability of the cleaning process.

[0003] To address this problem, it is necessary to design a device that can adjust the extraction air volume to adapt to changes in the exhaust air pressure of workshops and factory services. The device should be able to dynamically adjust the extraction air volume according to the cleaning needs and changes in air pressure to achieve precise control of the wind speed; through precise control of the value, the stability of the cleaning effect can be guaranteed when the air pressure changes, thereby improving the cleaning efficiency and quality.

[0004] The realization of value control needs to consider multiple factors. First, a reasonable air volume threshold should be set to ensure that the extraction air volume is within an appropriate range; second, a mapping relationship between wind pressure and extraction air volume should be established to achieve dynamic control; third, a feedback control mechanism should be introduced to adjust the extraction air volume in real time according to the feedback information of the cleaning effect; finally, the control device should also have a certain fault tolerance to avoid the loss of control of the extraction air volume due to drastic fluctuations in wind pressure.

[0005] In short, when the cleaning equipment is connected to the strong exhaust duct system, the extraction air volume caused by unstable wind pressure is difficult to control, which is a technical problem that needs to be solved urgently. Designing a device that can adjust the extraction air volume and accurately control the value is the key to improving the cleaning effect and stability. Summary of the invention

[0006] The purpose of the present invention is to solve the above defects and provide an exhaust method for connecting cleaning equipment to a strong exhaust duct system, so as to solve the technical problem that the exhaust method of the existing cleaning equipment in the above background technology is prone to fluctuations in wind pressure and is difficult to control the air volume during the exhaust process, thereby affecting the stability and reliability of the cleaning process.

[0007] The object of the present invention is achieved in the following ways:

[0008] An exhaust method for cleaning equipment connected to a strong exhaust duct system, the exhaust method comprising:

[0009] Obtain real-time wind pressure data of the strong exhaust duct system. Wind pressure sensors are arranged at the inlet, middle and outlet of the exhaust duct. The wind pressure data is collected once per second and transmitted to the control unit of the cleaning equipment.

[0010] The control unit determines the start and stop conditions of the exhaust fan according to the operating status signal of the feeding mechanism. When receiving the feeding completion signal, the control unit issues an exhaust fan start command and sends the wind speed parameter of 20 meters per second to the speed regulator. The speed regulator controls the exhaust fan to accelerate from 0 to the rated speed of 3000 revolutions per minute.

[0011] After the exhaust fan reaches the rated speed, the control unit determines whether the current wind pressure is within a reasonable range based on the preset wind pressure threshold. The wind pressure threshold range is set to 0.5 kPa to 2.0 kPa. When the acquired wind pressure exceeds the threshold range, the control unit determines the target motor frequency based on the wind pressure and exhaust motor frequency mapping table. The initial frequency in the mapping table is 30 Hz. For every 0.1 kPa increase in wind pressure, the corresponding motor frequency increases by 2 Hz. The inverter dynamically adjusts the actual operating frequency of the exhaust motor with an adjustment step of 0.5 Hz, so that the deviation between the actual frequency and the target frequency is controlled within ±1 Hz.

[0012] After the wind pressure reaches the standard, the exhaust port on the side of the water retaining ring begins to extract the cleaning water vapor carried by the cleaning plate fixture. The exhaust port is located at the 3 o'clock and 9 o'clock positions of the water retaining ring. The top exhaust port directly above the water retaining ring extracts the water vapor on the upper side of the water retaining ring.

[0013] The drainage pipe on the back of the cleaning equipment is divided into two sections, the upper section of the pipe extracts the water vapor in the cleaning chamber, and the lower section of the pipe discharges the residual cleaning waste water to the drainage pipe. The drainage pipe opens the drainage valve when the liquid level is higher than 80% and closes the drainage valve when it is lower than 20% according to the feedback signal of the liquid level sensor. When the liquid level is between 20% and 80%, the drainage valve is kept in the current state and the residual water is discharged to the factory service pipeline.

[0014] The water vapor extracted from the exhaust port of the water retaining ring and the back drainage pipe is collected in the water-gas separation device. The water-gas separation device adopts the principle of cyclone separation. It generates centrifugal force at a rotation speed of 1000 revolutions per minute to separate the water in the water-gas mixture. The separation efficiency reaches 95%. The separated waste gas is discharged to the plant service system through the exhaust motor pipeline through the air outlet of the water-gas separation device, and the separated water is discharged through a dedicated drainage pipe.

[0015] During the frequency control process of the exhaust motor, if the wind pressure of the strong exhaust duct system changes by more than 0.8 kPa within 1 second, the inverter cannot complete the motor frequency adjustment, and the control unit turns off the exhaust motor. When the wind pressure recovers to the range of 0.5 kPa to 2.0 kPa and the wind pressure fluctuation is less than 0.1 kPa for 30 consecutive seconds, the control unit re-acquires the wind pressure data to determine whether the wind pressure is within a reasonable range. If the wind pressure returns to normal, the exhaust motor is restarted and the operating parameters after recovery are recorded.

[0016] Beneficial effects of the present invention:

[0017] By arranging wind pressure sensors at the inlet, middle section and outlet of the exhaust duct, real-time wind pressure data is acquired at a collection frequency of once per second, which can accurately and comprehensively monitor wind pressure changes and provide an accurate basis for subsequent air volume control, thereby effectively solving the problem of improper air volume control caused by inaccurate wind pressure monitoring and ensuring the stability of the exhaust effect of the cleaning equipment;

[0018] The control unit controls the start and stop of the exhaust fan according to the operating status signal of the feeding mechanism, which can realize the precise start of the exhaust fan, avoiding unnecessary energy waste and equipment wear. At the same time, when receiving the feeding completion signal, the exhaust fan is started with a wind speed parameter of 20 meters per second and a rated speed of 3000 revolutions per minute, ensuring that the cleaning equipment can obtain the appropriate exhaust air volume at the initial stage of operation, improving the initial stability of the cleaning effect;

[0019] The wind pressure threshold range of 0.5 kPa to 2.0 kPa is preset, and the actual operating frequency of the exhaust motor is dynamically adjusted with a 0.5 Hz adjustment step according to the wind pressure and exhaust motor frequency mapping table and the frequency converter, so that the deviation between the actual frequency and the target frequency is controlled within ±1 Hz. The exhaust motor frequency can be accurately adjusted according to the wind pressure change, thereby achieving precise control of the extraction air volume, ensuring that the extraction air volume of the cleaning equipment is always within a reasonable range under the condition of wind pressure fluctuations, effectively avoiding the problem of excessive or insufficient air volume affecting the cleaning effect, and significantly improving the cleaning efficiency and quality;

[0020] The reasonable arrangement of the exhaust ports on the side and top of the water retaining ring, as well as the upper and lower sections of the drainage pipes on the back of the cleaning equipment, can fully and effectively extract the water vapor and wastewater generated during the cleaning process, ensuring the cleanliness and dryness of the cleaning environment and further improving the cleaning effect;

[0021] The drain pipe controls the switch of the drain valve according to the feedback signal of the liquid level sensor, which can discharge the residual cleaning wastewater in a timely and effective manner, avoiding the damage to the cleaning equipment caused by the accumulation of wastewater, and also saving water resources;

[0022] The water-gas separation device adopts the cyclone separation principle and generates centrifugal force at a rotation speed of 1000 rpm to separate the water from the water-gas mixture. The separation efficiency reaches 95%, which not only effectively reduces the moisture content in the exhaust gas and reduces the impact on the plant system, but also improves the quality and environmental protection of the exhaust gas emission.

[0023] During the frequency control of the exhaust motor, if the wind pressure of the strong exhaust duct system changes by more than 0.8 kPa within 1 second, the control unit can shut down the exhaust motor in time, and restart it after the wind pressure returns to normal, while recording the operating parameters after recovery. This measure effectively avoids the loss of control of the extraction air volume caused by drastic fluctuations in wind pressure, enhances the fault tolerance and stability of the system, and ensures the long-term stable operation of the cleaning equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the process of this embodiment; DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] In this embodiment, refer to Figure 1 , the exhaust method for cleaning equipment docking with a strong exhaust duct system is specifically implemented, and the exhaust method includes:

[0027] Step S101, obtain real-time wind pressure data of the strong exhaust duct system, wind pressure sensors are arranged at the inlet, middle and outlet of the exhaust duct, the wind pressure data is collected once per second, and the wind pressure data is transmitted to the control unit of the cleaning equipment.

[0028] Obtain wind pressure data collected by wind pressure sensors at the inlet, middle and outlet of the exhaust duct. The wind pressure data is collected once per second.

[0029] The wind pressure data collected by the wind pressure sensor is transmitted to the control unit of the cleaning equipment in real time through the data transmission module;

[0030] The control unit receives the wind pressure data transmitted by the wind pressure sensor and determines whether the wind pressure in the exhaust duct is normal according to a preset wind pressure threshold;

[0031] If the control unit determines that the wind pressure in the exhaust duct is abnormal, it sends a cleaning instruction to the cleaning device to start the cleaning operation of the exhaust duct;

[0032] During the exhaust duct cleaning process, the control unit continuously receives the real-time wind pressure data transmitted by the wind pressure sensor and dynamically monitors the changes in the duct wind pressure during the cleaning process;

[0033] When the exhaust duct is cleaned, the control unit determines whether the air pressure in the exhaust duct has returned to normal based on the air pressure data collected by the air pressure sensor;

[0034] If the wind pressure in the exhaust duct is normal, the cleaning operation is completed; if the wind pressure in the exhaust duct is still abnormal, the control unit repeats the cleaning instruction until the wind pressure in the exhaust duct returns to normal.

[0035] Optionally, in this embodiment, as an example, a wind pressure sensor of model PT100 is installed at the inlet, middle section and outlet of the exhaust duct respectively, and the sensor has a range of 0-1000Pa and an accuracy of ±5% FS. The wind pressure sensor collects wind pressure data at a frequency of once per second, and transmits the collected data to the PLC control unit of the cleaning equipment in real time through the RS485 bus. The normal wind pressure value range is preset in the control unit as 100-500Pa. If the received wind pressure value is lower than 100Pa or higher than 500Pa, the wind pressure in the exhaust duct is judged to be abnormal. When the wind pressure is abnormal, the control unit will send a 24V high-level signal to the cleaning equipment to trigger the cleaning program. The cleaning equipment uses a high-pressure water gun to flush the inside of the pipeline, with a water pressure of 10MPa and a flow rate of 20L / min. During the cleaning process, the control unit continuously receives wind pressure data, and dynamically adjusts the cleaning time and water pressure through the PID algorithm until the wind pressure value returns to the normal range. After cleaning is completed, the control unit compares the wind pressure values ​​before and after cleaning. If the wind pressure value drops by more than 50Pa, it is judged that the pipeline cleaning effect is good. Otherwise, the cleaning will continue. This cycle will continue until the wind pressure in the pipeline returns to normal.

[0036] Step S102, the control unit determines the start and stop conditions of the exhaust fan according to the operating status signal of the feeding mechanism. When receiving the feeding completion signal, the control unit issues an exhaust fan start command and sends the wind speed parameter 20 meters per second to the speed regulator, and the speed regulator controls the exhaust fan to accelerate from 0 to the rated speed of 3000 revolutions per minute.

[0037] The control unit obtains the operating status signal of the feeding mechanism to determine whether the feeding mechanism is in a feeding completion state; if the feeding mechanism is in a feeding completion state, the control unit generates an exhaust fan start-up instruction and wind speed parameters, and sends the exhaust fan start-up instruction and wind speed parameters to the speed regulator; after the speed regulator receives the exhaust fan start-up instruction and wind speed parameters sent by the control unit, it determines the target speed of the exhaust fan according to the wind speed parameters; the speed regulator obtains the actual speed of the exhaust fan, compares the actual speed with the target speed, and obtains the speed difference; the speed regulator calculates the speed regulation signal according to the speed difference using a preset PID control algorithm, and outputs the speed regulation signal to the frequency converter of the exhaust fan; under the control of the speed regulator, the speed of the exhaust fan gradually increases until it reaches and stabilizes at the preset rated speed.

[0038] Optionally, in the present embodiment, as an example, the control unit obtains the running status signal of the feeding mechanism in real time through the RS485 bus, and the status signal of the feeding mechanism is sent by the PLC, and the signal format is 16-bit integer data. After receiving the status signal, the control unit determines whether the third bit of the status signal is 1 through bit operation, if it is 1, it means that the feeding is completed, otherwise it means that the feeding is not completed. When it is judged that the feeding is completed, the control unit generates an exhaust fan start instruction, the instruction content is a 24V DC voltage signal, and the duration is 500ms. At the same time, the control unit calculates the corresponding exhaust fan target speed of 3000 revolutions per minute according to the preset wind speed parameter of 20 meters per second, and sends the target speed data to the speed regulator through the Modbus protocol.

[0039] After receiving the start command and target speed sent by the control unit, the speed regulator obtains the current actual speed of the exhaust fan through the Hall sensor, compares the actual speed with the target speed, and obtains the speed difference. According to the speed difference, the speed regulator uses the incremental PID control algorithm, sets the proportional coefficient Kp = 5, the integral time Ti = 5 seconds, and the differential time Td = 1 second, and calculates the speed regulation signal. The value range of the speed regulation signal is 0-10V DC voltage signal. The speed regulator outputs the calculated speed regulation signal to the frequency converter of the exhaust fan through the analog output module. The frequency converter adjusts the operating frequency of the exhaust fan according to the size of the speed regulation signal, thereby realizing the precise control of the exhaust fan speed. Under the control of the speed regulator, the speed of the exhaust fan gradually increases from 0, and after a 5-second acceleration process, it finally reaches and stabilizes at 3000 revolutions per minute.

[0040] Step S103, after the exhaust fan reaches the rated speed, the control unit determines whether the current wind pressure is within a reasonable range based on the preset wind pressure threshold, and the wind pressure threshold range is set to 0.5 kPa to 2.0 kPa. When the acquired wind pressure exceeds the threshold range, the control unit determines the target motor frequency based on the wind pressure and exhaust motor frequency mapping table. The initial frequency in the mapping table is 30 Hz, and the corresponding motor frequency increases by 2 Hz for every 0.1 kPa increase in wind pressure. The inverter dynamically adjusts the actual operating frequency of the exhaust motor with an adjustment step of 0.5 Hz, so that the deviation between the actual frequency and the target frequency is controlled within ±1 Hz.

[0041] The real-time speed of the exhaust fan is obtained to determine whether the real-time speed reaches the preset rated speed. If not, the real-time speed continues to be obtained until the rated speed is reached. The current wind pressure value is obtained, and the current wind pressure value is compared with the preset wind pressure threshold range to determine whether the current wind pressure value is within the wind pressure threshold range. If the current wind pressure value exceeds the wind pressure threshold range, the target motor frequency corresponding to the current wind pressure value is obtained from the pre-established wind pressure-frequency mapping table. The actual output frequency of the inverter is obtained, and the frequency deviation between the actual output frequency and the target motor frequency is calculated. If the frequency deviation exceeds the preset deviation threshold, the fuzzy control algorithm is used to determine the adjustment step and adjustment direction of the inverter according to the positive and negative frequency deviation. According to the adjustment step and adjustment direction, the inverter is controlled to dynamically adjust the actual output frequency until the frequency deviation is less than or equal to the deviation threshold. During the frequency modulation process, the speed and wind pressure values ​​of the exhaust fan are continuously obtained. If the speed or wind pressure value undergoes a preset abnormal change, the alarm mechanism is triggered, and the speed and wind pressure values ​​are displayed in real time through data visualization technology.

[0042] Step S104, after the wind pressure reaches the standard, the exhaust port on the side of the water retaining ring begins to remove the cleaning water vapor carried by the cleaning plate fixture, and the exhaust port is located at the 3 o'clock and 9 o'clock positions of the water retaining ring. The top exhaust port directly above the water retaining ring removes the water vapor on the upper side of the water retaining ring.

[0043] Acquire the real-time wind pressure data of the wind pressure sensor, and determine whether the wind pressure reaches a preset standard threshold. If it reaches the preset standard threshold, execute the next step; otherwise, continue to acquire the real-time wind pressure data of the wind pressure sensor;

[0044] According to the pre-established three-dimensional model of the water retaining ring, the specific position coordinates of the side exhaust ports at the 3 o'clock and 9 o'clock directions of the water retaining ring are determined;

[0045] Control the side exhaust ports at the 3 o'clock and 9 o'clock directions of the water retaining ring to open, and at the same time, start the exhaust device connected to the side exhaust ports to start extracting the cleaning water vapor carried by the cleaning plate fixture;

[0046] The surface image of the cleaning plate jig is analyzed by using computer vision technology to determine whether the amount of water vapor remaining on the surface of the cleaning plate jig is lower than a preset threshold. If so, the next step is executed; otherwise, the surface image of the cleaning plate jig is continuously analyzed by using computer vision technology;

[0047] Obtain the position coordinates of the exhaust port located just above the top of the water retaining ring, control the exhaust port to open, and at the same time, start the exhaust device connected to the exhaust port to start extracting the residual water vapor in the upper area of ​​the water retaining ring;

[0048] Use infrared thermal imaging technology to perform imaging analysis on the upper side of the water retaining ring, and determine whether the residual water vapor in the upper side of the water retaining ring is lower than a preset threshold value according to the result of the imaging analysis. If so, execute the next step; otherwise, continue to use infrared thermal imaging technology to perform imaging analysis on the upper side of the water retaining ring;

[0049] If the residual water vapor in the area where the side exhaust port and the top exhaust port are located is lower than the preset threshold, all exhaust ports are controlled to be closed, the exhaust device is stopped, and the water vapor extraction process is completed.

[0050] Step S105, the drainage pipe on the back of the cleaning equipment is divided into two sections, the upper section of the pipe extracts the water vapor in the cleaning chamber, and the lower section of the pipe discharges the residual cleaning waste water to the drainage pipe. The drainage pipe opens the drainage valve when the liquid level is higher than 80% and closes the drainage valve when it is lower than 20% according to the feedback signal of the liquid level sensor. When the liquid level is between 20% and 80%, the drainage valve is kept in the current state and the residual water is discharged to the factory service pipe.

[0051] Obtain the status information of the upper and lower sections of the drainage pipeline of the cleaning equipment, and determine whether the upper section normally extracts the water vapor in the cleaning chamber, and whether the lower section normally discharges the cleaning wastewater to the drainage pipeline. Obtain the feedback signal of the liquid level sensor in the drainage pipeline, and determine the percentage of the current liquid level according to the feedback signal. If the liquid level is higher than the preset 80% threshold, the drainage valve is controlled to open and the residual water is discharged to the plant service pipeline; if the liquid level is lower than the preset 20% threshold, the drainage valve is controlled to close; if the liquid level is between 20% and 80%, the current state of the drainage valve is determined and maintained unchanged. Through machine learning algorithms, based on historical liquid level data and drainage valve control data, an association model between the liquid level percentage and the drainage valve control strategy is established to predict the optimal control strategy of the drainage valve under different liquid level conditions. Obtain the water quality test data of the residual water discharged to the plant service pipeline to determine whether the water quality meets the discharge standard. If not, an alarm signal is issued to prompt secondary treatment. According to the diameter, length and other parameters of the drainage pipe, the fluid mechanics model is used to calculate the residual water discharge rate and discharge time at different liquid level percentages to optimize the drainage efficiency. The liquid level control, water quality testing, and discharge optimization strategies are integrated into the automatic control system of the cleaning equipment to form a complete cleaning wastewater discharge solution to improve discharge efficiency and water quality compliance.

[0052] According to the feedback signal of the liquid level sensor, the liquid level in the drainage pipe is judged. By setting the liquid level threshold, the opening, closing and holding conditions of the drainage valve are determined, and the control strategy of the residual water volume is obtained, and finally the wastewater is discharged into the plant pipeline.

[0053] Step S106, the water vapor extracted from the exhaust port of the water retaining ring and the back drainage pipe is collected in the water vapor separation device. The water vapor separation device adopts the cyclone separation principle, and generates centrifugal force at a rotation speed of 1000 revolutions per minute to separate the water from the water vapor mixture, and the separation efficiency reaches 95%. The separated waste gas is discharged to the factory service system through the exhaust motor pipeline through the air outlet of the water vapor separation device, and the separated water is discharged through a dedicated drainage pipe.

[0054] The water-gas mixture extracted from the exhaust port of the water retaining ring and the back drainage pipe is obtained, and the water-gas mixture is transported to the water-gas separation device for treatment; the water-gas separation device generates centrifugal force by high-speed rotation according to the preset cyclone separation principle to separate the water-gas mixture; it is judged whether the rotation speed of the water-gas separation device reaches the preset threshold value, if so, proceed to the next step; otherwise, the rotation speed is adjusted to the preset threshold value; according to the separation efficiency parameter of the water-gas separation device, the separation ratio of the water-gas mixture is determined to obtain the separated waste gas and water; the separated waste gas is discharged to the plant service system through the air outlet of the water-gas separation device, and the discharged waste gas volume and discharge time are recorded; the separated water is discharged through a dedicated drainage pipe, and the drainage volume and drainage time are recorded, and the drainage water quality is monitored to see if it meets the emission standards; according to the recorded waste gas emission volume, drainage volume and operating parameters of the water-gas separation device, the support vector machine algorithm is used to evaluate the operating status of the water-gas separation device, and the water-gas separation device is optimized and adjusted according to the evaluation results.

[0055] Step S107: During the frequency control of the exhaust motor, if the wind pressure of the strong exhaust duct system changes by more than 0.8 kPa within 1 second, the inverter cannot complete the motor frequency adjustment, and the control unit turns off the exhaust motor. When the wind pressure returns to the range of 0.5 kPa to 2.0 kPa, and the wind pressure fluctuation is less than 0.1 kPa for 30 consecutive seconds, the control unit reacquires the wind pressure data to determine whether the wind pressure is within a reasonable range. If the wind pressure returns to normal, the exhaust motor is restarted and the operating parameters after recovery are recorded.

[0056] Acquire the real-time operating frequency of the exhaust motor and the real-time wind pressure data of the forced exhaust duct system, and transmit the real-time operating frequency and real-time wind pressure data to the control unit;

[0057] The control unit determines whether the change range of the real-time wind pressure data within the preset time exceeds the wind pressure change threshold value according to the preset wind pressure change threshold value and time threshold value;

[0058] If the change amplitude exceeds the wind pressure change threshold, the control unit sends a stop command to the frequency converter, the frequency converter stops adjusting the frequency of the exhaust fan motor, and the control unit turns off the exhaust fan motor;

[0059] After the exhaust motor is turned off, the control unit continuously obtains the real-time wind pressure data of the strong exhaust duct system to determine whether the real-time wind pressure data is restored to the preset normal wind pressure range;

[0060] If the real-time wind pressure data returns to within the normal wind pressure range, the control unit continues to monitor the fluctuation of the real-time wind pressure data within the preset duration, and determines whether the fluctuation of the real-time wind pressure data within the preset duration is less than the wind pressure fluctuation threshold according to the preset wind pressure fluctuation threshold;

[0061] If the fluctuation is less than the wind pressure fluctuation threshold, the control unit obtains the current wind pressure data, compares the current wind pressure data with the normal wind pressure range, and determines whether the current wind pressure data is within the normal wind pressure range;

[0062] If the current wind pressure data is within the normal wind pressure range, the control unit sends a restart command to the inverter, and the inverter restarts the exhaust motor and records the operating frequency of the exhaust motor after restarting.

[0063] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention is disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent changes and modifications made to the above embodiments according to the technology of the present invention are within the scope of the technical solution of the present invention without departing from the content of the technical solution of the present invention.

Claims

1. An exhaust method for cleaning equipment docking a strong exhaust duct system, characterized in that: The exhaust method comprises: Step 1: Obtain real-time wind pressure data of the strong exhaust duct system. Wind pressure sensors are arranged at the inlet, middle and outlet of the exhaust duct. The wind pressure data is collected once per second and transmitted to the control unit of the cleaning equipment. Step 2: The control unit determines the start and stop conditions of the exhaust fan according to the operating status signal of the feeding mechanism. When receiving the feeding completion signal, the control unit issues an exhaust fan start command and sends the wind speed parameter of 20 meters per second to the speed regulator. The speed regulator controls the exhaust fan to accelerate from 0 to the rated speed of 3000 revolutions per minute; Step 3: After the exhaust fan reaches the rated speed, the control unit determines whether the current wind pressure is within a reasonable range according to the preset wind pressure threshold. The wind pressure threshold range is set to 0.5 kPa to 2.0 kPa. When the acquired wind pressure exceeds the threshold range, the control unit determines the target motor frequency according to the wind pressure and exhaust motor frequency mapping table. The initial frequency in the mapping table is 30 Hz. For every 0.1 kPa increase in wind pressure, the corresponding motor frequency increases by 2 Hz. The inverter dynamically adjusts the actual operating frequency of the exhaust motor with an adjustment step of 0.5 Hz, so that the deviation between the actual frequency and the target frequency is controlled within ±1 Hz. Step 4: After the wind pressure reaches the standard, the exhaust port on the side of the water retaining ring begins to extract the cleaning water vapor carried by the cleaning plate fixture. The exhaust port is located at the 3 o'clock and 9 o'clock positions of the water retaining ring, and the top exhaust port directly above the water retaining ring extracts the water vapor on the upper side of the water retaining ring; Step 5: The drainage pipe on the back of the cleaning equipment is divided into two sections, the upper section of the pipe extracts the water vapor in the cleaning chamber, and the lower section of the pipe discharges the remaining cleaning waste water to the drainage pipe. The drainage pipe opens the drainage valve when the liquid level is higher than 80% and closes the drainage valve when it is lower than 20% according to the feedback signal of the liquid level sensor. When the liquid level is between 20% and 80%, the drainage valve is kept in the current state and the residual water is discharged to the factory service pipeline; Step 6: The water vapor extracted from the exhaust port of the water retaining ring and the back drainage pipe is collected in the water vapor separation device. The water vapor separation device adopts the cyclone separation principle and generates centrifugal force at a rotation speed of 1000 revolutions per minute to separate the water in the water vapor mixture. The separation efficiency reaches 95%. The separated waste gas is discharged to the plant service system through the exhaust motor pipeline through the air outlet of the water vapor separation device, and the separated water is discharged through a dedicated drainage pipe; Step 7: During the frequency control process of the exhaust motor, if the wind pressure of the strong exhaust duct system changes by more than 0.8 kPa within 1 second, the inverter cannot complete the motor frequency adjustment, and the control unit turns off the exhaust motor. When the wind pressure recovers to the range of 0.5 kPa to 2.0 kPa and the wind pressure fluctuation is less than 0.1 kPa for 30 consecutive seconds, the control unit re-acquires the wind pressure data to determine whether the wind pressure is within a reasonable range. If the wind pressure returns to normal, the exhaust motor is restarted and the operating parameters after recovery are recorded.

2. The exhaust method for connecting cleaning equipment to a strong exhaust duct system according to claim 1, characterized in that: In the step 1, wind pressure data collected by wind pressure sensors at the inlet, middle and outlet of the exhaust duct are obtained, and the wind pressure data is collected once per second; The wind pressure data collected by the wind pressure sensor is transmitted to the control unit of the cleaning equipment in real time through the data transmission module; The control unit receives the wind pressure data transmitted by the wind pressure sensor and determines whether the wind pressure in the exhaust duct is normal according to a preset wind pressure threshold; If the control unit determines that the wind pressure in the exhaust duct is abnormal, it sends a cleaning instruction to the cleaning device to start the cleaning operation of the exhaust duct; During the exhaust duct cleaning process, the control unit continuously receives the real-time wind pressure data transmitted by the wind pressure sensor and dynamically monitors the changes in the duct wind pressure during the cleaning process; When the exhaust duct is cleaned, the control unit determines whether the air pressure in the exhaust duct has returned to normal based on the air pressure data collected by the air pressure sensor; If the air pressure in the exhaust duct is normal, the cleaning operation is completed; If the wind pressure in the exhaust duct is still abnormal, the control unit repeatedly executes the cleaning instruction until the wind pressure in the exhaust duct returns to normal.

3. The exhaust method for connecting cleaning equipment to a strong exhaust duct system according to claim 1, characterized in that: In the step 2, the control unit obtains the operation status signal of the feeding mechanism to determine whether the feeding mechanism is in a feeding completion state; If the feeding mechanism is in a feeding completion state, the control unit generates an exhaust fan start instruction and wind speed parameters, and sends the exhaust fan start instruction and wind speed parameters to the speed regulator; After receiving the exhaust fan start-up instruction and wind speed parameters sent by the control unit, the speed regulator determines the target speed of the exhaust fan according to the wind speed parameters; The speed regulator obtains the actual speed of the exhaust fan, compares the actual speed with the target speed, and obtains the speed difference; The speed regulator calculates the speed regulation signal based on the speed difference using a preset PID control algorithm, and outputs the speed regulation signal to the frequency converter of the exhaust fan; Under the control of the speed regulator, the speed of the exhaust fan gradually increases until it reaches and stabilizes at the preset rated speed.

4. The exhaust method for connecting cleaning equipment to a strong exhaust duct system according to claim 1, characterized in that: In step 3, the real-time speed of the exhaust fan is obtained and the Whether the real-time speed reaches the preset rated speed. If not, continue to obtain the real-time speed until it reaches the rated speed; Obtain the current wind pressure value, compare the current wind pressure value with the preset wind pressure threshold range, and determine whether the current wind pressure value is within the wind pressure threshold range; If the current wind pressure value exceeds the wind pressure threshold range, the target motor frequency corresponding to the current wind pressure value is obtained from the pre-established wind pressure-frequency mapping table; Get the actual output frequency of the inverter and calculate the frequency deviation between the actual output frequency and the target motor frequency; If the frequency deviation exceeds the preset deviation threshold, the fuzzy control algorithm is used to determine the adjustment step size and adjustment direction of the frequency converter according to the positive or negative value of the frequency deviation; According to the adjustment step size and adjustment direction, the inverter is controlled to dynamically adjust the actual output frequency until the frequency deviation is less than or equal to the deviation threshold; During the frequency modulation process, the speed and wind pressure values ​​of the exhaust fan are continuously obtained. If the speed or wind pressure values ​​undergo preset abnormal changes, the alarm mechanism is triggered, and the speed and wind pressure values ​​are displayed in real time through data visualization technology.

5. The exhaust method for connecting cleaning equipment to a strong exhaust duct system according to claim 1, characterized in that: In the step 4, real-time wind pressure data of the wind pressure sensor is obtained to determine whether the wind pressure reaches a preset standard threshold. If the preset standard threshold is reached, the next step is executed; otherwise, the real-time wind pressure data of the wind pressure sensor is continued to be obtained; According to the pre-established three-dimensional model of the water retaining ring, the specific position coordinates of the side exhaust ports at the 3 o'clock and 9 o'clock directions of the water retaining ring are determined; Control the side exhaust ports at the 3 o'clock and 9 o'clock directions of the water retaining ring to open, and at the same time, start the exhaust device connected to the side exhaust ports to start extracting the cleaning water vapor carried by the cleaning plate fixture; The surface image of the cleaning plate jig is analyzed by using computer vision technology to determine whether the amount of water vapor remaining on the surface of the cleaning plate jig is lower than a preset threshold. If so, the next step is executed; otherwise, the surface image of the cleaning plate jig is continuously analyzed by using computer vision technology; Obtain the position coordinates of the exhaust port located just above the top of the water retaining ring, control the exhaust port to open, and at the same time, start the exhaust device connected to the exhaust port to start extracting the residual water vapor in the upper area of ​​the water retaining ring; Use infrared thermal imaging technology to perform imaging analysis on the upper side of the water retaining ring, and determine whether the residual water vapor in the upper side of the water retaining ring is lower than a preset threshold value according to the result of the imaging analysis. If so, execute the next step; otherwise, continue to use infrared thermal imaging technology to perform imaging analysis on the upper side of the water retaining ring; If the residual water vapor in the area where the side exhaust port and the top exhaust port are located is lower than the preset threshold, all exhaust ports are controlled to be closed, the exhaust device is stopped, and the water vapor extraction process is completed.

6. The exhaust method for connecting cleaning equipment to a strong exhaust duct system according to claim 1, characterized in that: In the step 5, the status information of the upper section and the lower section of the drainage pipe of the cleaning equipment is obtained to determine whether the upper section normally extracts the water vapor in the cleaning chamber and whether the lower section normally discharges the cleaning wastewater to the drainage pipe; Obtaining a feedback signal from a liquid level sensor in the drainage pipe, and determining the percentage of the current liquid level according to the feedback signal; If the liquid level is higher than the preset 80% threshold, the drain valve is controlled to open and the residual water is discharged into the plant service pipeline; If the liquid level is lower than the preset 20% threshold, the drain valve is controlled to close; If the liquid level is between 20% and 80%, the current state of the drain valve is determined and maintained unchanged; Through machine learning algorithms, based on historical liquid level data and drain valve control data, a correlation model between liquid level percentage and drain valve control strategy is established to predict the optimal control strategy of the drain valve under different liquid level conditions; Obtain the water quality test data of the residual water discharged into the plant service pipeline to determine whether the water quality meets the discharge standards. If not, an alarm signal will be issued to prompt secondary treatment; According to the diameter and length parameters of the drainage pipe, the fluid mechanics model is used to calculate the residual water discharge rate and discharge time at different liquid level percentages to optimize the drainage efficiency; Integrate liquid level control, water quality testing and discharge optimization strategies into the automatic control system of the cleaning equipment to form a complete cleaning wastewater discharge solution to improve discharge efficiency and water quality compliance; It also includes: judging the liquid level in the drainage pipe according to the feedback signal of the liquid level sensor, determining the opening, closing and holding conditions of the drainage valve by setting the liquid level threshold, obtaining the control strategy of the residual water volume, and finally discharging the wastewater into the plant pipeline.

7. The exhaust method for connecting cleaning equipment to a strong exhaust duct system according to claim 1, characterized in that: In the step 6, the water-gas mixture extracted from the exhaust port of the water retaining ring and the back side drainage pipe is obtained, and the water-gas mixture is transported to the water-gas separation device for treatment; The water-gas separation device separates the water-gas mixture by generating centrifugal force through high-speed rotation according to the preset cyclone separation principle; Determine whether the rotation speed of the water-gas separation device reaches a preset threshold, and if so, proceed to the next step; Otherwise, adjust the rotation speed to a preset threshold; According to the separation efficiency parameter of the water-gas separation device, the separation ratio of the water-gas mixture is determined to obtain the separated waste gas and water; Discharge the separated waste gas to the plant management system through the air outlet of the water-gas separation device, and record the amount of waste gas discharged and the time of discharge; The separated water is discharged through a special drainage pipe, and the drainage volume and drainage time are recorded, while monitoring whether the drainage water quality meets the discharge standards; According to the recorded exhaust gas emissions and drainage as well as the operating parameters of the water-gas separation device, the support vector machine algorithm is used to evaluate the operating status of the water-gas separation device, and the water-gas separation device is optimized and adjusted according to the evaluation results.

8. The exhaust method for connecting cleaning equipment to a strong exhaust duct system according to claim 1, characterized in that: In the step 7, the real-time operating frequency of the exhaust motor and the real-time wind pressure data of the forced exhaust duct system are obtained, and the real-time operating frequency and the real-time wind pressure data are transmitted to the control unit; The control unit determines whether the change range of the real-time wind pressure data within the preset time exceeds the wind pressure change threshold value according to the preset wind pressure change threshold value and time threshold value; If the change amplitude exceeds the wind pressure change threshold, the control unit sends a stop command to the frequency converter, the frequency converter stops adjusting the frequency of the exhaust fan motor, and the control unit turns off the exhaust fan motor; After the exhaust motor is turned off, the control unit continuously obtains the real-time wind pressure data of the strong exhaust duct system to determine whether the real-time wind pressure data is restored to the preset normal wind pressure range; If the real-time wind pressure data returns to within the normal wind pressure range, the control unit continues to monitor the fluctuation of the real-time wind pressure data within the preset duration, and determines whether the fluctuation of the real-time wind pressure data within the preset duration is less than the wind pressure fluctuation threshold according to the preset wind pressure fluctuation threshold; If the fluctuation is less than the wind pressure fluctuation threshold, the control unit obtains the current wind pressure data, compares the current wind pressure data with the normal wind pressure range, and determines whether the current wind pressure data is within the normal wind pressure range; If the current wind pressure data is within the normal wind pressure range, the control unit sends a restart command to the inverter, and the inverter restarts the exhaust motor and records the operating frequency of the exhaust motor after restarting.

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