Automatic cleaning method for a filtering device of a hot air circulation system of a setting machine

Abstract

The present application relates to setting machine technical field, especially disclose a kind of automatic cleaning method of setting machine hot air circulation system filter device, first start the circulating fan of drying room and heat source form hot air, hot air is filtered after passing through filter mechanism, and complete fabric setting job, control center in the process of operation real-time acquisition filter screen windward side and the air pressure value of air outlet side by detection mechanism and calculate real-time air pressure difference value, when air pressure difference value exceeds preset pressure difference threshold, system automatically determines filter screen blockage and starts cleaning assembly;After cleaning operation starts, drive mechanism drives roller body to run, so that annular conveyor belt type filter screen is continuously rotated along the cloth direction, dust removal assembly is attached to the surface of filter screen and cleaned, surface dust and fiber impurities are stripped, and cooperate with the negative pressure suction force of suction assembly to collect the falling dust in time, air jet assembly sprays high-pressure air flow upward to blow off residual dust embedded in filter screen mesh, suction assembly synchronously negative pressure suction to raise dust, complete filter screen deep cleaning.

Description

Technical Field

[0001] This invention relates to the field of stenter technology, and in particular discloses an automatic cleaning method for the filter device of the hot air circulation system of a stenter. Background Technology

[0002] During the heat setting process of fabrics, the hot air circulation system continuously dries and sets the fabrics with hot air. The hot air flow carries a large amount of fiber debris, cotton wool, and dust impurities. These impurities easily adhere to the hot air filter screen, and long-term accumulation can cause the filter screen to become clogged. This leads to an increase in the air pressure difference before and after the filter screen, a decrease in the hot air circulation volume, and uneven temperature inside the drying room. This not only affects the setting quality of the fabrics but also easily causes problems such as increased equipment energy consumption and secondary dust re-entrainment that contaminates the fabrics due to filter screen clogging. Existing cleaning methods for stenter filters are mostly timed, overall, and intense cleaning, which cannot adaptively match the cleaning intensity according to the actual degree of filter clogging. Even when the clogging is only slight, full-power deep cleaning is still performed, resulting in significant energy waste. Furthermore, conventional filters are mostly fixed structures, making continuous repositioning cleaning difficult, resulting in many cleaning dead zones, incomplete dust removal, and difficulty in effectively removing residual dust inside the mesh. At the same time, long-term circulation of the filter can easily lead to deviation, offset, and jamming, further affecting the stability and uniformity of filter operation. This cannot meet the needs of continuous production in stenters while maintaining the long-term clean filtration effect of the filter. Therefore, there is an urgent need for an automatic cleaning method for stenter hot air circulation filters that can monitor air pressure in real time, perform graded adaptive cleaning, and has an automatic filter correction function. Summary of the Invention

[0003] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this invention is to provide an automatic cleaning method for the filter device of the hot air circulation system of a stenter.

[0004] To achieve the above objectives, the present invention provides an automatic cleaning method for the filter device of a hot air circulation system in a stenter, comprising the following steps: S1. Normal hot air circulation: Start the circulating fan and heat source in the drying room. The circulating fan and heat source together form hot air, which is filtered by the filtration mechanism to shape the fabric. S2. Periodic inspection: The control center drives the inspection mechanism to start, and the inspection mechanism collects the wind pressure values ​​on the windward side and the air outlet side of the filter mechanism in real time. The inspection mechanism transmits the wind pressure values ​​to the control center, and the control center calculates the real-time wind pressure difference on both sides of the filter based on the wind pressure values. S3. Automatic cleaning trigger: The control center has a preset differential pressure threshold. When the filter mechanism is clogged with dust, causing the air pressure difference between the two sides to exceed the preset differential pressure threshold, the control center determines that the filter is clogged according to the differential pressure judgment formula and automatically starts the cleaning component to clean the filter mechanism. S4. Dynamic feed of filter screen: After the cleaning component is started, the drive mechanism of the filter mechanism drives the roller to rotate, driving the annular conveyor belt filter screen to rotate continuously along the fabric feeding direction, so that the entire width of the filter screen passes through the first cleaning station and the second cleaning station of the cleaning component in sequence. S5. Filter cleaning: The dust removal component on the first cleaning station makes close contact with the front and back of the filter to clean it, removing dust and fiber impurities attached to the filter surface. The suction component works simultaneously to collect the dust that has been cleaned off in real time through negative pressure suction. S6. Deep cleaning of the filter mesh: The spray suction components on the second cleaning station work together. The air jet component on the windward side sprays high-pressure air upward to blow away the residual dust embedded in the filter mesh, while the air extraction component on the exhaust side simultaneously sucks away the dust that is raised by negative pressure, thus achieving deep cleaning of the filter mesh.

[0005] First, the circulating fan in the drying oven is started to generate hot air from the heat source. This hot air is then filtered by the filtration mechanism to complete the normal fabric setting process. During this process, the control center uses a detection mechanism to collect real-time air pressure values ​​on the windward and exhaust sides of the filter and calculates the real-time air pressure difference. When dust accumulation and blockage on the filter cause the air pressure difference to exceed the preset threshold, the system automatically determines that the filter is clogged and activates the cleaning components. After the cleaning operation is initiated, the drive mechanism rotates the rollers, causing the annular conveyor belt filter to continuously rotate along the fabric feeding direction. The entire filter surface passes through the first and second cleaning stations sequentially. The first cleaning station uses a dust removal component to clean the front and back of the filter in close contact, removing surface dust and... The first cleaning station removes fibrous impurities and collects loose dust instantly using the negative pressure suction of the suction component. The second cleaning station uses the air jet component on the windward side to spray high-pressure air upward to blow away residual dust embedded in the filter mesh, while the exhaust component on the air outlet side simultaneously uses negative pressure to suck away the dust that is raised, thus completing the deep cleaning of the filter. This invention relies on a dual-station cleaning structure that automatically triggers cleaning based on real-time differential pressure monitoring and continuously changes the filter position. It achieves automatic identification of filter blockage, fully automatic graded surface cleaning and deep cleaning of the mesh, effectively solving the problems of untimely filter cleaning, tedious manual cleaning and incomplete cleaning of dust accumulation in the mesh of traditional filters. It ensures stable filter performance, uniform hot air circulation, and improved fabric shaping quality.

[0006] It also includes the S7 automatic reset cycle: when the cleaning component starts, the detection mechanism starts simultaneously. The detection mechanism collects the air pressure values ​​on the windward side and the air outlet side of the filter mechanism in real time. When the air pressure difference between the two sides of the filter mechanism does not exceed the preset pressure difference threshold, the control center automatically shuts down the cleaning component and the equipment resets and switches to normal hot air circulation.

[0007] This solution relies on wind pressure monitoring to achieve automatic start-stop and reset of cleaning, with fully automated operation. The dual-station combination cleaning can thoroughly clean the filter dust, reducing manual intervention and stabilizing the filtration effect and hot air conditions, thus ensuring the fabric shaping quality.

[0008] The pressure difference judgment formula is ΔP=∣P1-P2∣, where ΔP represents the real-time wind pressure difference between the two sides of the filter, P1 represents the wind pressure value on the windward side of the filter, and P2 represents the wind pressure value on the air outlet side of the filter.

[0009] Assuming the equipment is running and detects an air pressure of P1 = 200 Pa on the windward side and P2 = 120 Pa on the outlet side of the filter, substituting these values ​​into the formula yields ΔP = |200 - 120| = 80 Pa. If the equipment's preset differential pressure threshold is 70 Pa, and the currently calculated differential pressure exceeds the threshold, the system can determine that the filter is clogged and initiate the cleaning process. This calculation formula allows for intuitive and accurate acquisition of differential pressure data, enabling quantitative monitoring of the filter's condition and improving the precision of the equipment's automated control.

[0010] The control center is equipped with a timed detection component. The timed detection component intermittently triggers the detection mechanism to work at preset time intervals, periodically collects the wind pressure values ​​on the windward and air outlet sides of the filter and calculates the wind pressure difference, continuously monitoring the dust accumulation and clogging of the filter.

[0011] The control center is equipped with a timed detection component, which can intermittently start the detection mechanism at set time intervals to periodically collect the air pressure values ​​on the windward and exhaust sides of the filter and calculate the pressure difference, thereby monitoring the dust accumulation and blockage status of the filter in real time. This method does not require the detection mechanism to operate continuously around the clock, which reduces equipment energy consumption and component wear while ensuring the continuity of filter condition monitoring. The monitoring method is efficient and practical.

[0012] The filtration mechanism includes a frame, a first roller, a second roller, a filter screen, and a drive motor, all rotatably mounted on the frame. The filter screen is circulated between the first roller and the second roller. The output end of the drive motor is connected to the first roller. The first roller is located at the infeed end of the drying chamber frame, and the second roller is located at the outfeed end of the drying chamber frame. The drive motor drives the first roller to rotate, thereby causing the entire filter screen to circulate and rotate, achieving continuous filter screen repositioning and cleaning operations.

[0013] This filtration mechanism consists of a frame, a first roller, a second roller, a filter screen, and a drive motor. The filter screen is circulated between the two rollers. The drive motor drives the first roller located at the feed end to rotate, thereby driving the entire filter screen to circulate and clean each area of ​​the filter screen in sequence. This structure enables continuous and uninterrupted feeding of the filter screen, with no dead corners in cleaning. It can be used in conjunction with a cleaning mechanism to complete full-area dust removal. The structure is reasonably laid out, operates stably, and effectively ensures continuous cleaning operations.

[0014] The detection mechanism includes a differential pressure sensor, a first differential pressure detection tube and a second differential pressure detection tube disposed at the detection end of the differential pressure sensor; the first differential pressure detection tube is located on the windward side of the filter screen and is used to collect the wind pressure value on the air inlet side of the filter screen, and the second differential pressure detection tube is located on the air outlet side of the filter screen and is used to collect the wind pressure value on the air outlet side of the filter screen.

[0015] The differential pressure sensor, together with two differential pressure detection tubes respectively located on the windward and air-outlet sides of the filter, forms a detection mechanism. The two detection tubes are placed on both sides of the filter and do not come into contact with the filter's movement trajectory, so they will not interfere with the movement of the rotating filter. This allows for stable acquisition of air pressure values ​​on the inlet and outlet sides of the filter. This split-type detection layout has a simple structure, is easy to install, has accurate sampling positions, and can reliably complete the work of acquiring air pressure values ​​over a long period of time.

[0016] The cleaning assembly includes a dust removal assembly and a suction assembly, which are configured in conjunction with the filter screen. The dust removal assembly includes a support, a rotating motor mounted on the support, and a brush roller connected to the output end of the rotating motor. The brush roller has multiple bristles for contacting the filter screen. The suction assembly includes a first air duct, a first suction pump located at one end of the first air duct, and a first exhaust air duct connected to the first suction pump. The end of the first air duct away from the first suction pump is the suction end, which faces the cleaning area of ​​the brush roller and is used to collect the dust and impurities that are removed by the brush roller. The first suction pump provides negative pressure suction to the first air duct, and the suction dust airflow is discharged uniformly through the first exhaust air duct, realizing centralized collection and treatment of filter screen dust and avoiding secondary dust fallback and contamination of the filter screen and fabric.

[0017] The cleaning components are arranged in sequence along the filter screen's rotation direction, including dust removal and suction components. A rotating motor drives the brush roller to rotate and sweep dust and fibrous impurities from the filter screen surface. The suction end facing the cleaning area forms a negative pressure under the action of the first air pump, which promptly sucks the loose dust and impurities into the air duct and discharges them through the first exhaust duct. This structure enables simultaneous cleaning and dust collection, efficiently cleaning dirt from the filter screen surface, effectively preventing secondary dust re-entrainment and re-falling back to contaminate the filter screen and fabric, resulting in good dust removal effect and a smooth operation process.

[0018] The spray suction assembly includes a jet assembly and an air extraction assembly. The jet assembly includes a jet pump and a jet head connected to the jet pump. The jet pump provides a high-pressure air source to the jet head, causing the jet head to spray a high-pressure airflow upward from below the filter screen. The air extraction assembly includes a suction head, a second suction pump connected to the suction head, and a second exhaust duct connected to the second suction pump. The second suction pump provides negative pressure suction to the suction head, enabling the suction head to simultaneously extract the dust raised above the filter screen. The extracted dust airflow is discharged uniformly through the second exhaust duct.

[0019] The spray suction assembly consists of a jet pump and a suction pump working together. The jet pump sprays high-pressure airflow from below the filter screen upwards through the jet nozzle to blow away the dust embedded in the filter screen mesh. The second suction pump creates negative pressure at the upper spray nozzle, simultaneously sucking up the dust raised by the airflow. Finally, the dusty airflow is discharged through the second exhaust duct. The combined upper and lower airflow structure can deeply clean the dust accumulated in the mesh, ensuring thorough cleaning while effectively preventing dust diffusion. Overall, it is reliable in operation and has excellent cleaning effect.

[0020] The filtration mechanism also includes a correction component, which comprises two correction sensors, a correction controller, a correction adjusting roller, and a swing drive component. The two correction sensors are respectively installed on the left and right edges of the filter screen to detect the direction and amount of filter screen offset in real time. The correction sensors are electrically connected to the correction controller. The correction adjusting roller is movably mounted on the frame at both ends, and the roller surface of the correction adjusting roller is in contact with the surface of the filter screen. The swing drive component is connected to the end of the correction adjusting roller and controlled by the correction controller. When the filter screen is running, the correction sensors transmit the offset signal to the correction controller. The correction controller drives the swing drive component to cause the correction adjusting roller to deflect at an angle. The lateral friction between the correction adjusting roller and the filter screen corrects the trajectory of the filter screen. After the filter screen returns to the correct position, the swing drive component drives the correction adjusting roller to return to a horizontal state.

[0021] When the filter is running, the deviation sensor transmits the offset signal to the deviation controller. When the filter deviates to the left, the controller drives the swing drive component to tilt the left side of the adjusting roller downwards and the right side upwards. The contact between the filter and the roller surface generates a rightward lateral force, pulling the filter back to the correct position. When the filter deviates to the right, the adjusting roller tilts downwards on the right side and upwards on the left side, relying on the leftward lateral force to complete the deviation correction. The controller can also precisely control the tilt angle and holding time of the adjusting roller according to the magnitude of the deviation, gradually correcting the filter's trajectory in a progressive manner, avoiding large-scale swings at once, effectively preventing the filter from being stretched and deformed. After the filter returns to the correct position, the swing drive component drives the deviation adjusting roller to reset to a horizontal state. This structure can dynamically correct filter deviation in real time, ensuring stable rotation of the annular filter over a long period of time, reducing filter wear and equipment jamming, and improving overall operational stability.

[0022] The preset differential pressure threshold is divided into a primary differential pressure threshold and a secondary differential pressure threshold, with the primary differential pressure threshold being less than the secondary differential pressure threshold. When the wind pressure difference is greater than the primary differential pressure threshold but not greater than the secondary differential pressure threshold, only the cleaning component is activated for surface cleaning. When the wind pressure difference is greater than the secondary differential pressure threshold, the cleaning component and the spray suction component operate synchronously to achieve graded cleaning and reduce equipment energy consumption.

[0023] This solution divides the preset differential pressure threshold into two levels: a primary differential pressure threshold and a secondary differential pressure threshold, each with smaller values. The system compares the filter's air pressure difference value with these two thresholds in real time. When the air pressure difference value is between the primary and secondary thresholds, only the cleaning component is activated to clean and suck up the filter surface. When the air pressure difference value exceeds the secondary threshold, both the cleaning component and the suction component are activated simultaneously for deep cleaning. This tiered start-stop control mode can match the corresponding cleaning mode according to the actual degree of filter clogging, avoiding ineffective full-load operation and significantly reducing the overall energy consumption of the equipment while ensuring the dust removal effect.

[0024] The first differential pressure detection tube and the second differential pressure detection tube are respectively arranged in the airflow channels on both sides of the filter screen. Both differential pressure detection tubes are separated from the movement trajectory of the filter screen, and there is no structural interference during operation, so they can continuously and stably collect wind pressure values.

[0025] The width of the brush roller is not less than the effective filtration width of the filter screen. The brush roller is in close contact with the front and back of the filter screen, which can completely remove dust and fiber impurities attached to all parts of the filter screen surface.

[0026] The jet nozzle and the suction nozzle are positioned directly opposite each other, with high-pressure airflow penetrating the filter mesh from bottom to top. Simultaneously, the suction nozzle above draws in dust, forming a closed dust removal structure that blows down and sucks up, preventing dust from spreading outward.

[0027] The first and second cleaning stations are arranged sequentially along the rotation direction of the filter screen, and the two cleaning stations are independent of each other, completing the surface cleaning and deep cleaning of the filter screen in sequence.

[0028] The jet head is equipped with multiple jet holes, and the high-pressure airflow acts evenly on the entire surface of the filter screen, ensuring that dust can be effectively blown away from all parts of the screen.

[0029] Both the first and second differential pressure sensing tubes are equipped with detachable dustproof screens at their ends. These screens prevent dust from entering the tubes and causing blockages, ensuring accurate wind pressure data acquisition. The dustproof screens can be replaced after a certain period of use.

[0030] During the cleaning process, the collected fibers and dust are centrally discharged and do not flow back into the hot air circulation duct of the drying room, thus completely eliminating secondary pollution of the fabric.

[0031] The circulating fan and heat source are both located below the filter assembly, which is located inside the drying chamber.

[0032] The beneficial effects of this invention are as follows: Based on the normal hot air setting operation in the setting machine drying chamber, the filter clogging status is monitored in real time using timed intermittent air pressure detection combined with a differential pressure quantification formula. A graded intelligent cleaning control for mild and severe filter clogging is achieved through primary and secondary dual differential pressure thresholds. Combined with the continuous rotary feeding of the annular filter, the filter surface passes through the first and second cleaning stations sequentially, completing surface cleaning with mechanical brush roller sweeping and negative pressure dust collection, as well as deep cleaning of the mesh through downward blowing and upward suction high-pressure jet suction. Simultaneously, a real-time dynamic correction structure is used throughout the process, utilizing the lateral force generated by the roller tilt to progressively correct filter misalignment, ensuring stable and centered operation of the filter. It can automatically reset and return to normal production conditions after the differential pressure returns to normal. Compared to traditional manual cleaning, single cleaning, and... This invention, through its blind start-stop method, achieves integrated intelligent operation encompassing quantitative monitoring of filter clogging status, on-demand tiered cleaning, fully automatic closed-loop start-stop, and automatic filter deviation correction. The cleaning station layout is rational and free of structural interference, enabling comprehensive and thorough removal of dust and fibers embedded in the filter surface and mesh. Dust is uniformly discharged without backflow, completely eliminating secondary fabric contamination. It effectively ensures uniform and stable hot air circulation, significantly improving fabric setting quality. Furthermore, it can match different cleaning power levels according to the degree of clogging, reducing ineffective energy consumption and component wear, and preventing filter misalignment, jamming, stretching deformation, and abnormal wear. The equipment requires no downtime for cleaning and minimal manual intervention, making it suitable for long-term continuous and stable batch production in setting machines, significantly improving equipment operational stability, cleaning efficiency, and production economy. Attached Figure Description

[0033] Figure 1 This is a flowchart of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention; Figure 3 This is a schematic diagram of the cleaning component of the present invention; Figure 4 This is a schematic diagram of the structure of the spray suction assembly of the present invention.

[0034] The reference numerals in the figures include: 1. Drying oven; 2. Filtration mechanism; 3. Detection mechanism; 4. Cleaning component; 5. Filter screen; 6. Dust removal component; 7. Suction component; 8. Spray suction component; 9. Air jet component; 11. Exhaust component; 12. Windward side; 13. Air outlet side; 14. Frame; 15. First roller; 16. Second roller; 17. Differential pressure sensor; 18. First differential pressure detection tube; 19. Second differential pressure detection tube; 22. Brush roller; 23. First air duct; 24. First exhaust pump; 25. First exhaust air duct; 26. Air jet pump; 27. Air jet head; 28. Spray suction head; 29. ​​Second exhaust pump; 31. Second exhaust air duct; 32. Correction component; 33. Correction sensor; 34. Correction adjustment roller; 35. Swing drive component; 36. Circulating fan; 37. Heat source. Detailed Implementation

[0035] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.

[0036] Please see Figures 1 to 4 As shown, the automatic cleaning method for the filter device of the hot air circulation system of a stenter according to the present invention comprises the following steps: S1. Normal hot air circulation: Start the circulating fan 36 and heat source 37 in the drying room 1. The circulating fan 36 and heat source 37 together form hot air, which is filtered by the filter mechanism 2 and then used to shape the fabric. S2. Periodic inspection: The control center drives the detection mechanism 3 to start. The detection mechanism 3 collects the wind pressure values ​​of the windward side 12 and the air outlet side 13 of the filter mechanism 2 in real time. The detection mechanism 3 transmits the wind pressure values ​​to the control center. The control center calculates the real-time wind pressure difference between the two sides of the filter 5 based on the wind pressure values. S3. Automatic cleaning trigger: The control center has a preset differential pressure threshold. When the filter mechanism 2 is clogged with dust and the air pressure difference between the two sides exceeds the preset differential pressure threshold, the control center determines that the filter screen 5 is clogged according to the differential pressure judgment formula and automatically starts the cleaning component 4 to clean the filter mechanism 2. S4. Dynamic feeding of filter screen 5: After the cleaning component 4 is started, the driving mechanism of the filter mechanism 2 drives the roller to rotate, driving the annular conveyor belt filter screen 5 to rotate continuously along the fabric feeding direction, so that the entire width of the filter screen 5 passes through the first cleaning station and the second cleaning station of the cleaning component 4 in sequence. S5. Filter 5 cleaning: The dust removal component 6 on the first cleaning station makes close contact with the front and back of the filter 5 to clean it, removing the dust and fiber impurities attached to the surface of the filter 5. The suction component 7 works simultaneously to collect the dust that has been cleaned off in real time through negative pressure suction. S6. Deep cleaning of the mesh: The spray suction component 8 on the second cleaning station works in conjunction with the air jet component 9 on the windward side 12 to spray high-pressure air upward to blow away the residual dust embedded in the mesh of the filter screen 5. Simultaneously, the air extraction component 11 on the air outlet side 13 sucks away the dust that is raised by negative pressure, thus achieving deep cleaning of the filter screen 5.

[0037] First, the circulating fan 36 of the drying chamber 1 is started to generate hot air with the heat source 37. The hot air is filtered by the filter mechanism 2 to complete the normal fabric setting operation. During the operation, the control center collects the wind pressure values ​​of the windward side 12 and the air outlet side 13 of the filter screen 5 in real time through the detection mechanism 3 and calculates the real-time wind pressure difference. When the wind pressure difference exceeds the preset pressure difference threshold due to dust accumulation and blockage of the filter screen 5, the system automatically determines that the filter screen 5 is blocked and starts the cleaning component 4. After the cleaning operation is started, the drive mechanism drives the roller to rotate, so that the annular conveyor belt filter screen 5 rotates continuously along the fabric feeding direction, so that the entire width of the filter screen 5 passes through the first cleaning station and the second cleaning station in sequence. The first cleaning station uses the dust removal component 6 to clean the front and back of the filter screen 5 in close contact, removing surface dust. Dust and fiber impurities are collected instantly by the negative pressure suction of the suction component 7. The second cleaning station blows away residual dust embedded in the mesh of the filter screen 5 by spraying high-pressure air upward through the jet component 9 on the windward side 12. At the same time, the suction component 11 on the air outlet side 13 simultaneously sucks away the dust that is raised, thus completing the deep cleaning of the filter screen 5. This invention relies on real-time differential pressure monitoring to automatically trigger cleaning and a dual-station cleaning structure that continuously changes the position of the filter screen 5. It realizes automatic identification of filter screen 5 blockage, fully automatic graded surface cleaning and deep cleaning of mesh, effectively solving the problems of untimely cleaning of traditional filter screen 5, tedious manual cleaning and incomplete cleaning of dust accumulation in mesh, ensuring stable filtration performance of filter screen 5, ensuring uniform hot air circulation, and improving the fabric shaping quality.

[0038] It also includes the S7 automatic reset cycle: when the cleaning component 4 starts, the detection mechanism 3 starts simultaneously. The detection mechanism 3 collects the wind pressure values ​​of the windward side 12 and the air outlet side 13 of the filter mechanism 2 in real time. When the wind pressure difference between the two sides of the filter mechanism 2 does not exceed the preset pressure difference threshold, the control center automatically shuts down the cleaning component 4 and the equipment resets and switches to normal hot air circulation.

[0039] This solution relies on wind pressure monitoring to achieve automatic start-stop and reset of cleaning, and operates in a fully automated manner. The dual-station combination cleaning can thoroughly clean the dust on the filter screen, which reduces manual intervention, stabilizes the filtration effect and hot air conditions, and ensures the quality of fabric shaping.

[0040] The pressure difference judgment formula is ΔP=∣P1-P2∣, where ΔP represents the real-time wind pressure difference between the two sides of filter 5, P1 represents the wind pressure value on the windward side 12 of filter 5, and P2 represents the wind pressure value on the air outlet side 13 of filter 5.

[0041] Assuming the equipment is running, the detected air pressure on the windward side (12) of filter 5 is P1=200Pa, and the air pressure on the outlet side (13) is P2=120Pa. Substituting these values ​​into the formula, we get ΔP=|200-120|=80Pa. If the equipment's preset differential pressure threshold is 70Pa, and the currently calculated differential pressure exceeds the threshold, the system can determine that filter 5 is clogged and initiate the cleaning process. This calculation formula allows for intuitive and accurate acquisition of differential pressure data, enabling quantitative monitoring of filter 5's status and improving the accuracy of automated equipment control.

[0042] The control center is equipped with a timed detection component. The timed detection component intermittently triggers the detection mechanism 3 to work at a preset time interval, periodically collects the wind pressure values ​​of the windward side 12 and the air outlet side 13 of the filter 5 and calculates the wind pressure difference, continuously monitoring the dust accumulation and blockage of the filter 5.

[0043] The control center is equipped with a timed detection component, which can intermittently start the detection mechanism 3 at set time intervals to periodically collect the wind pressure values ​​of the windward side 12 and the air outlet side 13 of the filter 5 and calculate the pressure difference, thereby monitoring the dust accumulation and blockage status of the filter 5 in real time. This method does not require the detection mechanism 3 to run continuously around the clock. While ensuring the continuity of the filter 5's operating condition monitoring, it reduces equipment energy consumption and component wear. The monitoring method is efficient and practical.

[0044] The filtration mechanism 2 includes a frame 14, a first roller 15 and a second roller 16 rotatably mounted on the frame 14, a filter screen 5, and a drive motor. The filter screen 5 is circulated between the first roller 15 and the second roller 16. The output end of the drive motor is connected to the first roller 15. The first roller 15 is arranged at the cloth inlet end of the drying chamber 1 frame, and the second roller 16 is arranged at the cloth outlet end of the drying chamber 1 frame. The drive motor drives the first roller 15 to rotate, thereby driving the filter screen 5 to rotate circulantly, realizing continuous repositioning and cleaning of the filter screen 5.

[0045] This filtration mechanism 2 consists of a frame 14, a first roller 15, a second roller 16, a filter screen 5, and a drive motor. The filter screen 5 is circulated between the two rollers. The drive motor drives the first roller 15 located at the cloth inlet to rotate, thereby driving the filter screen 5 to rotate as a whole, so that each area of ​​the filter screen 5 is sequentially rotated and cleaned. This structure enables the filter screen 5 to be continuously and uninterruptedly fed, with no dead corners in cleaning. It can be used in conjunction with the cleaning mechanism to complete the whole area dust removal. The structure is reasonable, the operation is stable, and it effectively ensures the continuous operation of cleaning.

[0046] The detection mechanism 3 includes a differential pressure sensor 17, a first differential pressure detection tube 18 and a second differential pressure detection tube 19 disposed at the detection end of the differential pressure sensor 17; the first differential pressure detection tube 18 is located on the windward side 12 of the filter screen 5 and is used to collect the wind pressure value on the air inlet side of the filter screen 5, and the second differential pressure detection tube 19 is located on the air outlet side 13 of the filter screen 5 and is used to collect the wind pressure value on the air outlet side 13 of the filter screen 5.

[0047] The differential pressure sensor 17, together with two differential pressure detection tubes respectively located on the windward side 12 and the air outlet side 13 of the filter 5, forms the detection mechanism 3. The two detection tubes are placed on both sides of the filter 5 and do not contact the movement trajectory of the filter 5, so they will not interfere with the movement of the rotating filter 5. They can stably collect the wind pressure values ​​on the inlet and outlet sides 13 of the filter 5. This split detection layout has a simple structure, is easy to install, has a precise sampling position, and can reliably complete the wind pressure value collection work for a long time.

[0048] The cleaning component 4 includes a dust removal component 6 and a suction component 7, which are configured to work in conjunction with the filter screen 5. The dust removal component 6 includes a bracket, a rotating motor mounted on the bracket, and a brush roller 22 connected to the output end of the rotating motor. The brush roller 22 has multiple bristles for contacting the filter screen 5. The suction component 7 includes a first air duct 23, a first suction pump 24 located at one end of the first air duct 23, and a first exhaust air duct 25 connected to the first suction pump 24. The end of the first air duct 23 away from the first suction pump 24 is the suction end, which faces the cleaning area of ​​the brush roller 22 and is used to collect the dust and impurities that are swept off by the brush roller 22. The first suction pump 24 provides negative pressure suction to the first air duct 23, and the suction airflow of dust is discharged uniformly through the first exhaust air duct 25, realizing the centralized collection and treatment of dust on the filter screen 5 and avoiding secondary dust fallback and contamination of the filter screen 5 and the fabric.

[0049] The cleaning component 4 is arranged with the dust removal component 6 and the suction component 7 in sequence along the rotation direction of the filter screen 5. The rotating motor drives the brush roller 22 to rotate and sweep the dust and fiber impurities on the surface of the filter screen 5. The suction end facing the cleaning area forms a negative pressure under the action of the first air pump 24, which promptly sucks the detached dust and impurities into the air duct and discharges them through the first exhaust air duct 25. This structure realizes the simultaneous operation of sweeping and dust collection, which can efficiently clean the dirt on the surface of the filter screen 5, effectively prevent the dust from flying again and falling back to contaminate the filter screen 5 and the fabric, and has a good dust removal effect and a continuous operation process.

[0050] The spray suction assembly 8 includes a jet assembly 9 and an air extraction assembly 11. The jet assembly 9 includes a jet pump 26 and a jet head 27 connected to the jet pump 26. The jet pump 26 provides a high-pressure air source to the jet head 27, causing the jet head 27 to spray high-pressure airflow from below the filter screen 5 upwards. The air extraction assembly 11 includes a spray suction head 28, a second air extraction pump 29 connected to the spray suction head 28, and a second exhaust duct 31 connected to the second air extraction pump 29. The second air extraction pump 29 provides negative pressure suction to the spray suction head 28, causing the spray suction head 28 to simultaneously extract the dust raised above the filter screen 5. The extracted dust airflow is discharged uniformly through the second exhaust duct 31.

[0051] The spray suction assembly 8 works in conjunction with the jet assembly 9 and the suction assembly 11. The jet pump 26 sprays high-pressure airflow from below the filter screen 5 upwards through the jet head 27 to blow away the dust embedded in the mesh of the filter screen 5. The second suction pump 29 creates negative pressure at the upper spray suction head 28 to simultaneously suck up the dust raised by the airflow. Finally, the dust airflow is discharged through the second exhaust duct 31. The combined upper and lower airflow structure can deeply clean the dust accumulated in the mesh, ensuring thorough cleaning. At the same time, it can effectively prevent dust diffusion, and the overall operation is reliable with excellent cleaning effect.

[0052] The filtration mechanism 2 further includes a correction component 32, which includes two correction sensors 33, a correction controller, a correction adjusting roller 34, and a swing drive component 35. The two correction sensors 33 are respectively installed on the left and right edges of the filter screen 5 to detect the direction and amount of offset of the filter screen 5 in real time. The correction sensors 33 are electrically connected to the correction controller. The two ends of the correction adjusting roller 34 are movably mounted on the frame 14, and the roller surface of the correction adjusting roller 34 is in contact with the surface of the filter screen 5. The swing drive component 35 is connected to the end of the correction adjusting roller 34 and controlled by the correction controller. When the filter screen 5 is running, the correction sensors 33 transmit the offset signal to the correction controller. The correction controller drives the swing drive component 35 to drive the correction adjusting roller 34 to deflect at an angle. The lateral friction between the correction adjusting roller 34 and the filter screen 5 is used to correct the trajectory of the filter screen 5. After the filter screen 5 returns to the correct position, the swing drive component 35 drives the correction adjusting roller 34 to return to the horizontal state.

[0053] When filter 5 is running, the deviation sensor 33 transmits the offset signal to the deviation controller. When filter 5 deviates to the left, the controller drives the swing drive component 35 to tilt the left side of the adjusting roller downward and the right side upward. The filter 5 contacts the roller surface, generating a lateral force to the right, pulling the filter 5 back to the correct position. When filter 5 deviates to the right, the adjusting roller tilts downward on the right side and upward on the left side, relying on the lateral force to the left to complete the deviation correction. The controller can also precisely control the tilt angle and holding time of the adjusting roller according to the magnitude of the deviation, gradually correcting the trajectory of filter 5 in a progressive manner, avoiding large swings at once, effectively preventing filter 5 from being stretched and deformed. After filter 5 returns to the correct position, the swing drive component 35 drives the deviation adjusting roller 34 to reset to a horizontal state. This structure can dynamically correct the deviation of filter 5 in real time, ensuring the stable rotation of the annular filter 5 over a long period of time, reducing filter 5 wear and equipment jamming failures, and improving overall operational stability.

[0054] The preset differential pressure threshold is divided into a primary differential pressure threshold and a secondary differential pressure threshold, with the primary differential pressure threshold being less than the secondary differential pressure threshold. When the wind pressure difference is greater than the primary differential pressure threshold but not greater than the secondary differential pressure threshold, only the cleaning component 4 is activated for surface cleaning. When the wind pressure difference is greater than the secondary differential pressure threshold, the cleaning component 4 and the spray suction component 8 operate synchronously to achieve graded cleaning and reduce equipment energy consumption.

[0055] This solution divides the preset differential pressure threshold into two smaller thresholds: a primary differential pressure threshold and a secondary differential pressure threshold. The system compares the air pressure difference value of filter 5 with these two thresholds in real time. When the air pressure difference value is between the primary and secondary thresholds, only the cleaning component 4 is activated to clean and suck up the surface of filter 5. When the air pressure difference value exceeds the secondary threshold, both the cleaning component 4 and the suction component 8 are activated simultaneously for deep cleaning. This tiered start-stop control mode can match the corresponding cleaning mode according to the actual degree of clogging of filter 5, avoiding ineffective full-load operation and significantly reducing the overall energy consumption of the equipment while ensuring the dust removal effect.

[0056] The first differential pressure detection tube 18 and the second differential pressure detection tube 19 are respectively arranged in the airflow channels on both sides of the filter screen 5. Both differential pressure detection tubes are separated from the movement trajectory of the filter screen 5, and there is no structural interference during operation, so the wind pressure value can be continuously and stably collected.

[0057] The width of the brush roller 22 is not less than the effective filtration width of the filter screen 5. The brush roller 22 is in close contact with the front and back of the filter screen 5, which can completely remove dust and fiber impurities attached to all parts of the surface of the filter screen 5.

[0058] The jet nozzle 27 and the suction nozzle 28 are arranged vertically opposite each other. The high-pressure airflow penetrates the mesh of the filter screen 5 from bottom to top, and the suction nozzle 28 simultaneously sucks up the dust, forming a closed dust removal structure of blowing down and sucking up, which prevents the dust from spreading outward.

[0059] The first and second cleaning stations are arranged sequentially along the rotation direction of the filter screen 5, and the two cleaning stations are independent of each other, completing the surface cleaning and deep cleaning of the filter screen 5 in sequence.

[0060] The jet head 27 is equipped with multiple jet holes, and the high-pressure airflow acts evenly on the entire surface of the filter screen 5, ensuring that dust in all parts of the screen can be effectively blown away.

[0061] Both the first differential pressure detection tube 18 and the second differential pressure detection tube 19 are detachably equipped with dustproof protective nets at their ends. These nets prevent dust from entering the tubes and causing blockages in the detection lines, thus ensuring the accuracy of wind pressure data acquisition. The dustproof protective nets can be replaced after a certain period of use.

[0062] During the cleaning process, the collected fibers and dust are centrally discharged and do not flow back into the hot air circulation duct of the drying room, thus completely eliminating secondary pollution of the fabric.

[0063] Both the circulating fan 36 and the heat source 37 are located below the filter assembly, which is located inside the drying chamber 1.

[0064] The above description is only a preferred embodiment of the present invention. For those skilled in the art, there will be changes in the specific implementation and application scope based on the ideas of the present invention. The content of this specification should not be construed as a limitation of the present invention.

Claims

1. An automatic cleaning method for the filter device of a hot air circulation system in a hair setting machine, comprising the following steps: S1. Normal hot air circulation: Start the circulating fan (36) and heat source (37) in the drying room (1). The circulating fan (36) and heat source (37) together form hot air, which is filtered by the filter mechanism (2) to shape the fabric. S2. Periodic inspection: The control center drives the inspection mechanism (3) to start. The inspection mechanism (3) collects the wind pressure values ​​of the windward side (12) and the air outlet side (13) of the filter mechanism (2) in real time. The inspection mechanism (3) transmits the wind pressure values ​​to the control center. The control center calculates the real-time wind pressure difference between the two sides of the filter screen (5) based on the wind pressure values. S3. Automatic cleaning: The control center has a preset differential pressure threshold. When the filter mechanism (2) is clogged with dust, causing the air pressure difference between the two sides to exceed the preset differential pressure threshold, the control center determines that the filter screen (5) is clogged according to the differential pressure judgment formula and automatically starts the cleaning component (4) to clean the filter mechanism (2). S4. Dynamic feeding of filter screen (5): After the cleaning component (4) is started, the driving mechanism of the filter mechanism (2) drives the roller to rotate, driving the annular conveyor belt filter screen (5) to rotate continuously, so that the filter screen (5) passes through the first cleaning station and the second cleaning station of the cleaning component (4) in sequence. S5. Filter (5) cleaning: The dust removal component (6) on the first cleaning station makes close contact with the front and back of the filter (5) to clean it, and remove the dust and fiber impurities attached to the surface of the filter (5). The suction component (7) works simultaneously to collect the dust that has been cleaned off by negative pressure suction. S6. Deep cleaning of the mesh: The spray suction component (8) on the second cleaning station works together. The air jet component (9) on the windward side (12) sprays high-pressure air upward to blow away the residual dust embedded in the mesh of the filter screen (5). The air extraction component (11) on the air outlet side (13) simultaneously sucks away the dust raised by negative pressure, thus achieving deep cleaning of the filter screen (5).

2. The automatic cleaning method of the filter device of the hot air circulation system of the stenter as described in claim 1 further includes S7 automatic reset cycle: when the cleaning component (4) is started, the detection mechanism (3) is started synchronously. The detection mechanism (3) collects the wind pressure values ​​of the windward side (12) and the air outlet side (13) of the filter mechanism (2) in real time. When the wind pressure difference between the two sides of the filter mechanism (2) does not exceed the preset pressure difference threshold, the control center automatically shuts down the cleaning component (4) and the equipment is reset and switched to normal hot air circulation.

3. The automatic cleaning method for the filter device of the hot air circulation system of a stenter according to claim 1, characterized in that: The pressure difference judgment formula is ΔP=∣P1-P2∣, where ΔP represents the real-time wind pressure difference between the two sides of the filter (5), P1 represents the wind pressure value on the windward side (12) of the filter (5), and P2 represents the wind pressure value on the air outlet side (13) of the filter (5).

4. The automatic cleaning method for the filter device of the hot air circulation system of a stenter according to claim 1, characterized in that: The control center is equipped with a timed detection component. The timed detection component intermittently triggers the detection mechanism (3) to work at a preset time interval, periodically collects the wind pressure values ​​of the windward side (12) and the air outlet side (13) of the filter (5) and calculates the wind pressure difference, continuously monitoring the dust accumulation and blockage of the filter (5).

5. An automatic cleaning method for the filter device of a hot air circulation system of a stenter according to claim 1, characterized in that: The filtration mechanism (2) includes a frame (14), a first roller (15), a second roller (16), a filter screen (5), and a drive motor, which are rotatably mounted on the frame (14). The filter screen (5) is circulated between the first roller (15) and the second roller (16). The output end of the drive motor is connected to the first roller (15). The first roller (15) is arranged at the cloth inlet end of the frame of the drying chamber (1), and the second roller (16) is arranged at the cloth outlet end of the frame of the drying chamber (1). The drive motor drives the first roller (15) to rotate, thereby driving the filter screen (5) to rotate in a circular manner, so as to realize the continuous repositioning and cleaning operation of the filter screen (5).

6. The automatic cleaning method for the filter device of the hot air circulation system of a stenter according to claim 1, characterized in that: The detection mechanism (3) includes a differential pressure sensor (17), a first differential pressure detection tube (18) and a second differential pressure detection tube (19) disposed at the detection end of the differential pressure sensor (17); the first differential pressure detection tube (18) is located on the windward side (12) of the filter (5) and is used to collect the wind pressure value on the air inlet side of the filter (5); the second differential pressure detection tube (19) is located on the air outlet side (13) of the filter (5) and is used to collect the wind pressure value on the air outlet side of the filter (5).

7. The automatic cleaning method for the filter device of the hot air circulation system of a stenter according to claim 1, characterized in that: The cleaning component (4) includes a dust removal component (6) and a suction component (7), which are configured to cooperate with the filter screen (5). The dust removal component (6) includes a bracket, a rotating motor mounted on the bracket, and a brush roller (22) connected to the output end of the rotating motor. The brush roller (22) has multiple bristles for contacting the filter screen (5). The suction component (7) includes a first air duct (23), a first air pump (24) mounted at one end of the first air duct (23), and a device connected to the first air pump (24). The first exhaust duct (25) is connected to the first exhaust duct (23); the end of the first duct (23) away from the first suction pump (24) is the suction end. The suction end of the first duct (23) is directly opposite the cleaning area of ​​the brush roller (22) and is used to absorb the dust and impurities that are swept off by the brush roller (22). The first suction pump (24) provides negative pressure suction to the first duct (23). The dust airflow is uniformly discharged through the first exhaust duct (25) to realize the centralized collection and treatment of dust on the filter screen (5) and avoid secondary dust fall back and contaminate the filter screen (5) and the fabric.

8. An automatic cleaning method for the filter device of a hot air circulation system of a stenter according to claim 1, characterized in that: The spray suction assembly (8) includes a jet assembly (9) and an air extraction assembly (11). The jet assembly (9) includes a jet pump (26) and a jet head (27) connected to the jet pump (26). The jet pump (26) provides a high-pressure air source to the jet head (27), so that the jet head (27) sprays high-pressure airflow from below the filter screen (5) upwards. The air extraction assembly (11) includes a spray suction head (28), a second air extraction pump (29) connected to the spray suction head (28), and a second exhaust duct (31) connected to the second air extraction pump (29). The second air extraction pump (29) provides negative pressure suction to the spray suction head (28), so that the spray suction head (28) simultaneously extracts the dust raised above the filter screen (5). The extracted dust airflow is discharged uniformly through the second exhaust duct (31).

9. An automatic cleaning method for the filter device of a hot air circulation system of a stenter according to claim 1, characterized in that: The filtration mechanism (2) further includes a correction component (32), which includes two correction sensors (33), a correction controller, a correction adjusting roller (34), and a swing drive component (35). The two correction sensors (33) are installed on the left and right edges of the filter screen (5) respectively, and are used to detect the direction and amount of the filter screen (5)'s movement offset in real time. The correction sensors (33) are electrically connected to the correction controller. The correction adjusting roller (34) is movably mounted on the frame (14) at both ends, and the roller surface of the correction adjusting roller (34) is flush with the filter screen (5). 5) The surfaces are in contact. The swing drive component (35) is connected to the end of the correction roller (34) and controlled by the correction controller. When the filter screen (5) is running, the correction sensor (33) transmits the offset signal to the correction controller. The correction controller drives the swing drive component (35) to drive the correction roller (34) to deflect at an angle. The lateral friction between the correction roller (34) and the filter screen (5) is used to correct the trajectory of the filter screen (5). After the filter screen (5) returns to the correct position, the swing drive component (35) drives the correction roller (34) to return to the horizontal state.

10. An automatic cleaning method for the filter device of a hot air circulation system of a stenter according to claim 1, characterized in that: The preset differential pressure threshold is divided into a primary differential pressure threshold and a secondary differential pressure threshold, and the primary differential pressure threshold is less than the secondary differential pressure threshold; When the wind pressure difference is greater than the first-level pressure difference threshold but not greater than the second-level pressure difference threshold, only the cleaning component (4) is activated to clean the surface; when the wind pressure difference is greater than the second-level pressure difference threshold, the cleaning component (4) and the spray suction component (8) operate synchronously to achieve graded cleaning and reduce equipment energy consumption.

Images