Filter screen cleaning mechanism for textile mill air pipeline and hot air recovery pipeline of boarding machine

Abstract

The filter screen cleaning mechanism for the textile mill air pipeline comprises a base frame used for being attached to the inner wall of an air inlet of the pipeline and a reciprocating swing mechanism slidably connected to the base frame, and further comprises an air blowing assembly arranged on the reciprocating swing mechanism, and an air blowing opening facing a filter screen is formed in the air blowing assembly; the air blowing pressure of the air blowing opening is larger than the air inlet pressure of the air inlet, and when the reciprocating swing mechanism operates, the air blowing assembly is driven to reciprocate in the air inlet and blow air to the filter screen. By means of a non-contact blowing mode, soft flocks and dust particles attached to the surface of the filter screen can be effectively removed, the device is suitable for cleaning the filter screens at air inlets of various pipelines in a textile workshop, compared with an existing vibration or scraper mode, the surface of the filter screen is not prone to being damaged, and the cleaning effect is good. And the cleaning effect on filiform soft flocks is better, and the normal and continuous working time of various pipeline systems is greatly prolonged.

Description

Technical Field

[0001] This invention relates to the field of textile technology, and in particular to a filter cleaning mechanism for ventilation ducts in textile factories and a hot air recovery duct for setting machines. Background Technology

[0002] During the production process in textile workshops, a large amount of lint is generated in stages such as raw material processing (e.g., opening and carding), spinning (e.g., ring spinning and air-jet spinning), and weaving (e.g., water-jet looms and knitting machines), among which filamentous lint is the most typical. This type of lint is characterized by its fine length, easy entanglement, and easy suspension. For example, cotton fibers can reach a length of 2-35mm, while chemical fibers (e.g., polyester and nylon) are more prone to electrostatic adsorption.

[0003] These lint particles easily become suspended in the air, adhere to equipment, or are emitted outdoors, causing dust pollution, reduced equipment precision, increased failure rates, and environmental pollution. Therefore, various air ducts in textile workshops (such as air conditioning supply / return ducts, dust removal ducts, and exhaust ducts) are equipped with filters, especially at the air inlets and outlets. Some filters even require anti-static or fire-retardant specifications.

[0004] The setting machine is one of the essential pieces of equipment in the post-dyeing and printing process. Its function is to set the width of the washed fabric, making it unfolded and crisp. During the setting process, baking equipment is often used. Hot air is circulated and applied to the fabric as it is conveyed through an oven set up on the fabric conveyor line, thereby setting the fabric. Therefore, the lint generated during the setting process is the most severe.

[0005] Currently, the port of the hot air recovery duct needs to be aligned with the air outlet of the oven. The hot air output from the oven is drawn into the duct through the end of the fabric conveyor (chain track). Since some lint usually adheres to the fabric during the dyeing process, this lint will drift into the air after drying and enter the duct under the negative pressure. In existing technology, to prevent this lint from affecting the hot air circulation and heating, filters are installed at the air inlet of the duct. These filters generally have small pores to improve the filtration effect on the lint.

[0006] However, after prolonged use, these lint particles will stick to the filter screen. Some of the lint particles are filamentous and can easily get tangled in the filter screen, causing the filter screen pores to shrink. As a result, the flow rate of hot air recovery decreases, the heat utilization rate decreases, energy consumption increases, and cleaning becomes extremely inconvenient.

[0007] To address this issue, existing manufacturers install vibration mechanisms or scrapers at the air inlet to vibrate the filter or scrape its surface repeatedly, causing the lint to fall off.

[0008] In practice, we found that vibration needs to be maintained constantly, and its effect on preventing lint from getting tangled in the filter screen is not significant. Although the dust removal effect is good, when the ends of lint enter the filter screen pores, the vibration force will exacerbate the tangling of the lint, so it actually has the disadvantage of aggravating lint entanglement. Furthermore, the filter screen is prone to loosening of screws and falling off due to prolonged exposure to high temperature and vibration, which poses a potential risk, requiring regular manual maintenance.

[0009] The reciprocating scraping of the filter screen by a scraper is effective for removing larger particles of lint and dust. It is simple in structure, low in cost, and widely used. However, similarly, once the ends of fibrous lint enter the filter screen's pores, the scraper exerts a pulling force on them, causing the lint to become entangled on the filter screen or directly pull it into the air duct. Furthermore, long-term scraping of the filter screen surface causes wear, which is exacerbated by high temperatures, requiring periodic shutdowns for scraper and filter maintenance.

[0010] Therefore, in order to overcome the drawback of existing stenter filter screens being easily clogged, this application proposes a filter screen cleaning mechanism for textile factory air ducts and a stenter hot air recovery duct that can clean the filamentous lint wrapped around the filter screen without easily damaging the filter screen. Summary of the Invention

[0011] The purpose of this invention is to overcome the shortcomings of existing technologies by proposing a filter cleaning mechanism for textile factory air ducts and a hot air recovery pipe for setting machines. It can effectively remove lint and dust particles attached to the filter surface through non-contact air blowing. It is suitable for cleaning filters at the air inlets of various pipes in textile workshops. Compared with existing methods that use vibration or scrapers, it is less likely to damage the filter surface and has a better cleaning effect on filamentous lint, significantly improving the normal and continuous working time of various pipe systems.

[0012] Firstly, in order to achieve the above objectives, the present invention provides the following technical solution: A filter cleaning mechanism for air ducts in textile factories includes a base frame for attaching to the inner wall of the air inlet of the duct and a reciprocating swing mechanism slidably connected to the base frame. It also includes an air blowing assembly provided on the reciprocating swing mechanism, wherein the air blowing assembly is provided with an air blowing port facing the filter. The blowing pressure at the air outlet is greater than the air inlet pressure. When the reciprocating swing mechanism is running, it drives the air blowing assembly to move back and forth in the air inlet and blow air onto the filter.

[0013] This embodiment effectively removes lint and dust particles adhering to the filter surface through non-contact air blowing. It is suitable for cleaning filters at the air inlets of various pipelines in textile workshops. Compared with existing methods that use vibration or scrapers, it is less likely to damage the filter surface and has a better cleaning effect on filamentous lint, significantly improving the normal and continuous working time of various pipeline systems.

[0014] In one embodiment, the side surface of the air blowing assembly facing the filter is V-shaped or U-shaped.

[0015] This embodiment minimizes the impact of the air blowing component on the flow area of ​​the piping system and does not significantly affect the air intake velocity. It avoids negatively impacting the air intake pressure and thus the air extraction function of the piping system. In particular, when applied to the hot air recovery piping of a stenter, it reduces heat loss and thus reduces the energy consumption required for circulating heated air.

[0016] In one embodiment, the air blowing component is an air knife.

[0017] This method can specifically target the cleaning of filamentous hair, and its effectiveness far surpasses that of vibration and scraper methods, preventing the filter from becoming clogged due to the entanglement of filamentous hair.

[0018] In one embodiment, the blowing assembly includes an air inlet plate and a mounting plate fixedly connected to each other, the mounting plate being used to attach the blowing assembly to the reciprocating swing mechanism; The outer wall of the air intake plate is provided with at least one air intake hole, and the side of the air intake plate near the filter screen is provided with a slit, which is connected to the air intake hole, and the length direction of the slit is perpendicular to the movement direction of the reciprocating swing mechanism.

[0019] In one embodiment, the slit is located on the lower part of the side of the air intake plate closest to the mounting plate.

[0020] This embodiment ensures that the entire surface of the filter screen can be covered by the movement range of the air knife, thereby guaranteeing that fibrous debris on any part of the filter screen can be effectively cleaned.

[0021] In one embodiment, the blowing pressure of the air outlet is 1.15 to 1.95 times the air inlet pressure.

[0022] This implementation method facilitates its application in most piping systems in textile workshops.

[0023] In one embodiment, the blowing direction of the air outlet is perpendicular to the plane where the filter is located.

[0024] This embodiment provides a method for cleaning the filter screen of the air duct for hot air recovery in a stenter.

[0025] In one embodiment, the angle between the blowing direction of the air outlet and the plane where the filter screen is located is 30 to 90°.

[0026] This method allows the removed dust particles, lint particles, and other impurities to re-attach to the filter screen, improving the cleaning effect without significantly reducing the efficiency of the piping system itself. It is particularly suitable for piping systems with relatively mild or no lint problems.

[0027] In one embodiment, the reciprocating swing mechanism is a reciprocating cylinder.

[0028] This implementation method ensures that only localized airflow is generated on the filter at any given time, and the air extraction function of the pipe itself is not affected at non-force points, thus ensuring normal airflow within the textile workshop.

[0029] Secondly, in order to achieve the above objectives, the present invention also provides the following technical solution: The hot air recovery duct of the shaping machine, including the aforementioned cleaning mechanism, also includes: The main supervisor is located above the oven of the shaping machine; An air inlet duct, one end of which is fixedly connected to the air inlet end of the main pipe, and the other end of which is an air inlet facing the air outlet end of the oven. A filter screen, which covers and is fixedly connected to the air inlet; Gas source, used to supply gas to the air blowing assembly; The control module has its output terminals electrically connected to the reciprocating swing mechanism and the input terminal of the air source, respectively.

[0030] This implementation provides a targeted cleaning solution for lint, dust, and other impurities in the hot air recovery system of the setting machine. It can effectively keep the filter surface free from clogging and adhesion for a long time, enabling the hot air recovery system of the setting machine to operate efficiently for a long time.

[0031] In one embodiment, the air source is connected in a through connection to both the reciprocating cylinder and the air blowing assembly.

[0032] In one embodiment, the system further includes a timer, a first solenoid valve, and a second solenoid valve. The timer is electrically connected to the controller, and the input terminals of the two solenoid valves are electrically connected to the output terminal of the controller. The first solenoid valve is connected through the compressor and the blowing assembly, and the second solenoid valve is connected through the compressor and the reciprocating cylinder.

[0033] This implementation method effectively avoids the problem of pressure changes in compressed gas in the air pipeline, thereby improving the control of the blowing component and the reciprocating swing mechanism; it also enables the cleaning mechanism to perform periodic blowing actions according to a set time, thereby further saving the energy consumption of the cleaning mechanism while meeting the cleaning effect.

[0034] In one embodiment, the blowing pressure of the air outlet is 1.2 to 1.3 times the air inlet pressure.

[0035] This embodiment constructs an air inlet duct with low hot air intake loss, which is suitable for hot air recovery systems in stenters.

[0036] In one embodiment, the mesh size of the filter is 50-400 mesh.

[0037] This implementation method facilitates its application in most piping systems in textile workshops.

[0038] In one embodiment, the filter screen has a mesh size of 15-25.

[0039] This implementation method facilitates its application in most hot air recovery systems of setting machines in textile workshops.

[0040] Compared with the prior art, the beneficial effects of this invention are as follows: by blowing air without contact, it can effectively remove lint and dust particles attached to the filter screen surface, and it is suitable for cleaning the filter screen at the air inlet of various pipelines in textile workshops. Compared with the existing methods of vibration or scraping, it is less likely to damage the filter screen surface and has a better cleaning effect on filamentous lint, which greatly improves the normal and continuous working time of various pipeline systems. Attached Figure Description

[0041] Figure 1 This is an installation diagram of the hot air recovery pipe for the shaping machine proposed in this invention, mainly showing the airflow direction; Figure 2 This is a three-dimensional structural diagram of the hot air recovery pipeline of the shaping machine proposed in this invention, mainly showing the installation position of the filter screen; Figure 3 This is a three-dimensional structural diagram of the hot air recovery pipe of the shaping machine proposed in this invention, mainly viewed from above. Figure 4 This is a three-dimensional structural diagram of the hot air recovery pipe of the shaping machine proposed in this invention, mainly showing the view from the main pipe end and the internal structure of the air inlet pipe. Figure 5 This is a three-dimensional structural diagram of the filter cleaning mechanism for textile factory ventilation ducts proposed in this invention, mainly showing the overall structure during operation; Figure 6 This is a three-dimensional structural diagram of the filter cleaning mechanism for textile factory ventilation ducts proposed in this invention; Figure 7 This is a front view of the filter cleaning mechanism for textile factory ventilation ducts proposed in this invention, mainly showing the inclined filter and air blowing assembly; Figure 8 This is a front view of the filter cleaning mechanism for textile factory air ducts proposed in this invention, mainly showing the installation diagram of the air blowing component in the reciprocating swing mechanism; Figure 9 This is a three-dimensional structural diagram of the air knife in the filter cleaning mechanism for textile factory ventilation ducts proposed in this invention; Figure 10 This is an exploded structural diagram of the air knife in the filter cleaning mechanism for textile factory ventilation ducts proposed in this invention; Figure 11 This is a system topology diagram of the filter cleaning mechanism for textile factory ventilation ducts proposed in this invention; Figure 12 The surface image of the air inlet pipe of the hot air recovery duct of the existing shaping machine after 1 hour of use in control group 3; Figure 13 The surface image of the air inlet pipe of the existing hot air recovery pipe of the shaping machine after 1 hour of use in control group 2; Figure 14 The surface image of the air inlet pipe of the hot air recovery duct of the existing shaping machine after 1 hour of use in control group 1. Figure 15 The surface image of the hot air recovery pipe inlet pipe of this shaping machine after 1 hour of use using the method in experimental group 3; Figure 16 The image shows the surface of a filter screen after 30 seconds of manual cleaning of a clogged filter screen using the filter screen cleaning mechanism for textile factory ventilation ducts proposed in this invention.

[0042] In the diagram: A, drying oven; A1, air outlet; 1. Supervisor; 11. Air inlet end; 2. Air inlet duct; 21. Air inlet; 22. Filter screen; 3. Base frame; 4. Reciprocating swing mechanism; 41. Reciprocating cylinder; 5. Air blowing assembly; 51. Air knife; 511. Air inlet plate; 5111. Air inlet hole; 512. Mounting plate; 513. Slit; 5131. Air blowing port; 6. Gas source; 7. Control module; 8. Timer; 91. First solenoid valve; 92. Second solenoid valve. Detailed Implementation

[0043] Textile workshops typically contain significant particulate pollution, such as dust (which may be directly formed from wool lint) and lint, which can harm the health of workers, affect the operating conditions and lifespan of various equipment, and create a relatively hot environment. Therefore, modern textile workshops are usually equipped with various air ducts for air conditioning recirculation systems, dust removal systems, and exhaust systems. Furthermore, to prevent dust and lint from entering unauthorized areas or to ensure their effective collection, filters (22) are typically installed on the ducts to filter these substances.

[0044] For example, filters 22 are installed at the air inlet ducts of the air conditioning system (such as Chinese Utility Model No. CN221705711U) and the hot air recovery system of the shaping machine (such as Chinese Utility Model No. CN215822598U) to prevent lint and dust particles from entering the pipes. Filters 22 are also installed in the pipes of the exhaust system and the dust removal system (such as Chinese Utility Model No. CN216501432U) to facilitate the separation of dust particles and lint.

[0045] However, after prolonged use, these substances tend to adhere to the filter screen 22, causing blockages, affecting pipe flow, and consequently impacting its functionality. Existing cleaning methods, such as vibrating the filter screen 22 or using scrapers, are not very effective at removing fibrous debris specific to textile workshops. For the filter screen 22 in the hot air circulation system of the setting machine, they only remove dust and can easily exacerbate the entanglement and blockage of fibrous debris on the filter screen 22.

[0046] In addition, the scraper method also has the problem of the anti-rust coating on the filter screen surface being peeled off due to abrasion. Currently, acidic / alkaline cleaning agents are commonly used to maintain the filter screen. These chemicals are easy to remain on the damaged filter screen, and the filter screen is prone to corrosion in such a high-temperature environment, which increases the cost of consumables.

[0047] Therefore, it should be understood that the following embodiments are practices made in response to problems existing in the specific scenario of a textile workshop. Those skilled in the art should understand that any practice that directly applies the following embodiments or can be equivalent to them in various air ducts in a textile workshop should fall within the scope of these embodiments.

[0048] Furthermore, those skilled in the art should understand that the above-mentioned scenarios all have the characteristic of long-term uninterrupted operation. If it is a non-workshop scenario with non-continuous operation, such as household air conditioners, hair dryers, and pet shop hot air circulating hair dryers in the prior art, since there is no continuous air force, the hair and dust will adhere to the filter 22 for a long time, resulting in either no clogging or only minor clogging that can be easily cleaned manually. In such cases, the above-mentioned technical problems are not present, or it is difficult for those skilled in the art to discover the above-mentioned technical problems.

[0049] Although this embodiment can still be applied to scenarios with non-continuous wind, it does not require overcoming technical obstacles.

[0050] Therefore, the following embodiments are only for scenarios where there is continuous airflow in the duct. These embodiments enable the lint and dust particles that are continuously attached to the filter screen 22 to be cleaned, so that the cleaned filter screen 22 can support long-term continuous and efficient operation in the above scenarios.

[0051] Of course, for the parts not mentioned above, such as the collection of filtered dust and lint, existing methods can be used.

[0052] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] Example 1:

[0054] Please see Figure 1-10 The present invention provides the following technical solution: a cleaning mechanism for a filter screen 22 for a textile factory air duct, including a base frame 3 for attaching to the inner wall of the air inlet 21 of the duct and a reciprocating swing mechanism 4 slidably connected to the base frame 3, and also including an air blowing assembly 5 provided on the reciprocating swing mechanism 4, the air blowing assembly 5 being provided with an air blowing port 5131 facing the filter screen 22. The blowing pressure at the air outlet 5131 is greater than the air inlet pressure at the air inlet 21. When the reciprocating swing mechanism 4 is running, it drives the air blowing assembly 5 to move back and forth in the air inlet 21 and blow air onto the filter screen 22.

[0055] As an optional implementation of the present invention, when air is introduced into the air duct, the air in the textile workshop, as well as the lint and dust in the air, are drawn into the air duct, and the filter screen 22 blocks these larger dust particles and lint. When the reciprocating swing mechanism 4 and the air blowing assembly 5 are running, the reciprocating swing mechanism 4 drives the air blowing assembly 5 to swing back and forth, and blows air from the air inlet 21 onto the surface of the filter screen 22. At this time, the blowing direction is opposite to the air intake direction, and the air pressure of the blowing direction is greater than that of the air intake direction. Therefore, under the combined force of the two air forces, the dust particles and lint can move towards the filter screen 22. Thus, the dust particles and lint that are blocked or stuck on the filter screen 22 can be removed from the filter screen 22 by the air blowing force, thereby realizing the cleaning function of various dust and lint on the filter screen 22.

[0056] The advantage of using a reciprocating oscillating air blowing method for cleaning is that it only creates airflow to the filter 22 locally at any given time, and does not affect the air extraction function of the pipe itself at non-force points, ensuring normal airflow in the textile workshop.

[0057] In particular, on the first aspect, for filamentous hairs that are difficult to remove from the filter screen 22 using existing vibration or scraping methods, the non-contact method of blowing air ensures that the hairs inside the filter screen 22 holes do not come into contact with the cleaning mechanism itself. Therefore, it avoids the problem that the scraping method would generate a pulling force on one end of the filamentous hairs, causing the hairs to be pulled into the air duct or directly wrapped around the filter screen 22. Secondly, since the blowing pressure is required to be greater than the inlet pressure, the direction of the resultant force on the filamentous hairs remains unchanged at any local position during the swing of the blowing component 5. Therefore, compared with the existing vibration method, the filamentous hairs are less likely to get tangled on the filter screen 22 due to the disordered change of the force direction.

[0058] In some embodiments, the air inlet 5131 may be a linearly uniformly distributed porous form; In some embodiments, the air outlets 5131 are parallel or aligned with each other. In this case, the air outlets 5131 can be arranged in a wavy or straight line on the air blowing assembly 5. Of course, a straight distribution is more conducive to the production and manufacturing of the air blowing assembly 5.

[0059] In some embodiments, the air outlet 5131 can be in the form of an air knife 51. In this case, the air pressure is more concentrated, and the pressure on filamentous hair and dust particles is greater. Therefore, the cleaning effect on impurities that have already adhered to the surface of the filter screen 22 is better. Of course, such a design is also more conducive to reducing the use of compressed gas and reducing costs.

[0060] In some embodiments, the air outlet 5131 is perpendicular to the plane of the filter screen 22. In this case, the advantage is that various filamentous hairs and dust particles can be directly blown out of the surface of the filter screen 22, and the probability of entanglement is minimized. This is suitable for cases where the filter screen 22 has slightly larger pores. Moreover, for heat recovery scenarios (such as the air inlet 21 of the duct of the air supply system and exhaust system), the local hot air can be drawn back into the duct along the same path after being blown out, so the heat loss is minimized. In some other embodiments, the air outlet 5131 forms an acute or obtuse angle with the plane of the filter screen 22. In this case, the component of the blowing pressure parallel to the air inlet direction is still required to be greater than the air inlet pressure. Although the air pressure utilization rate is not optimal, and the heat loss is not optimal in the heat recovery scenario, the advantage is that when the blowing assembly 5 passes through dust particles and lint, it can generate a radial thrust along the pipe, so that during the reciprocating swing of the blowing assembly 5, these substances can be blown to the side of the pipe inlet 21. In this way, there will be no problem that some lighter dust particles and lint will be blown out and then re-adhere to the filter screen 22. This is more suitable for non-heat recovery scenarios, where the dust particles and lint are small in size and length, such as the pipe inlet 21 of the dust removal system in the workshop. There is no need to consider the impact on the ambient temperature. In addition, the dust removal system is located closer to the edge of the workshop, and the lint is not so concentrated, or the lint that can drift to the edge of the workshop is small in size and mass. Of course, this embodiment does not limit the actual direction of the air pressure, as long as there is wind force along the radial direction of the pipe, preferably tilted in the direction of the swing of the air blowing component 5.

[0061] In some embodiments, the reciprocating swing mechanism 4 adopts existing technical solutions such as reciprocating cylinder 41 and reciprocating lead screw. Due to the infinite number of examples, they will not be listed one by one. Any method that can drive the air blowing component 5 to move back and forth falls within the scope of the reciprocating swing mechanism 4.

[0062] In some embodiments, the air blowing assembly 5 reciprocates in a plane parallel to the plane where the filter screen 22 is located, which makes the air pressure on the filter screen 22 equal at all points, and the cleaning effect of the filter screen 22 is consistent at all points. This is suitable for scenarios where the air inlet pressure is equal at all points, such as when the filter screen 22 is located inside a pipe. According to Bernoulli's principle, the pressure at all points of the filter screen 22 is equal, so the probability of lint and dust adhering to any point on the filter screen 22 is relatively small. In some other embodiments, the air blowing assembly 5 may reciprocate in a plane that is not parallel to the plane where the filter 22 is located. This makes the air pressure on the filter 22 inconsistent at different points, which is suitable for situations where local air pressure is concentrated, such as when the filter 22 is located at a bend in the duct (such as the hot air return duct 2 of the stenter in a later embodiment). In some other embodiments, the blowing pressure of each air outlet 5131 in the air blowing assembly 5 is not consistent. For example, the blowing pressure of the middle air outlet 5131 is relatively greater, or the blowing pressure of one end air outlet 5131 is greater. The same applies to the situation where the air inlet pressure is inconsistent in the plane where the filter screen 22 is located.

[0063] In some embodiments, the reciprocating swing mechanism 4 can effectively reduce energy consumption by swinging at timed intervals and the air blowing component 5 can effectively reduce energy consumption by blowing air at timed intervals.

[0064] In some embodiments, the duct can be an air inlet duct 2 or an exhaust duct, such as an exhaust duct in an exhaust gas system. Dust particles and lint are filtered through a filter screen 22 on the exhaust duct, so the cleaning mechanism can be applied to the exhaust duct.

[0065] This method effectively removes lint and dust particles adhering to the surface of the filter screen 22 through non-contact air blowing. It is applicable to cleaning the filter screen 22 at the air inlet 21 of various pipelines in textile workshops. Compared with the existing methods of vibration or scraping, it is less likely to damage the surface of the filter screen 22 and has a better cleaning effect on filamentous lint, greatly improving the normal and continuous working time of various pipeline systems.

[0066] In some embodiments, the mesh size of filter 22 is 50-400 mesh or 15-25 mesh.

[0067] As an optional implementation of the present invention, most existing textile workshop filters 22 use 50-120 mesh for dust filtration and 15-25 mesh for the hot air recovery system of the stenter. They are generally made of metal and have a rust-proof surface treatment.

[0068] However, in certain customized scenarios, ultra-micropore filters 22 may be used to achieve better filtration results. For example, in the exhaust gas emission system of a textile workshop, a multi-stage filter system 22 may be used. In such scenarios, the primary, secondary, and tertiary filters 22 have different filtration levels, with the smallest pore size reaching 400 mesh, such as HEPA-grade filters 22 used for VOCs adsorption or high-precision dust removal. The pore size of such filters 22 is already less than 0.1 mm. Moreover, special materials may be used to make the filter 22, such as activated carbon mesh, photocatalytic mesh, and synthetic fiber mesh.

[0069] In summary, such a filter 22 is definitely not suitable for cleaning by vibration or scraping, while the non-contact air blowing method is obviously more advantageous. Therefore, the above-mentioned limitation on the filter 22 reflects the strong adaptability of this cleaning mechanism.

[0070] Example 2:

[0071] Please see Figure 1-10 The present invention provides the following technical solution: a cleaning mechanism for a filter screen 22 for a textile factory air duct, including a base frame 3 for attaching to the inner wall of the air inlet 21 of the duct and a reciprocating cylinder 41 slidably connected to the base frame 3, and an air knife 51 provided on the reciprocating cylinder 41, the air knife 51 being provided with an air blowing port 5131 facing the filter screen 22. The blowing pressure of the air outlet 5131 is 1.15 to 1.95 times the air inlet pressure at the air inlet 21. The blowing direction of the air outlet 5131 is perpendicular to the plane where the filter screen 22 is located. When the reciprocating cylinder 41 runs, it drives the air knife 51 to move in a plane parallel to the filter screen 22. The surface of the air knife 51 facing the filter screen 22 is V-shaped or U-shaped.

[0072] As an optional implementation of the present invention, compared with Embodiment 1, this embodiment further specifies that the blowing component is an air knife 51 and the specific blowing pressure and blowing direction. As described in Embodiment 1, the blowing pressure of the air knife 51 is stronger, and the pressure acting on dust particles and lint is greater. Since the air inlet direction is also perpendicular to the filter screen 22, the air outlet direction is also perpendicular to the filter screen 22, so that the filamentous lint attached to the filter screen 22 can be directly pushed back out of the filter holes of the filter screen 22 along the air inlet direction. This is something that existing vibration and scraper methods cannot do. Therefore, the cleaning effect on filamentous lint is significantly better.

[0073] It is understood that this embodiment is a practice specifically designed for long-length impurities such as "filamentous lint," and is particularly suitable for piping systems in textile workshops where lint is concentrated, such as hot air recovery systems and exhaust gas emission systems for setting machines.

[0074] The V-shaped or U-shaped design of the air knife 51 facing the filter screen 22 makes the air knife 51 have a sharper streamline shape at the air outlet 5131, which is more in line with the fluid dynamics design. This makes the air knife 51 have a lower impact on the flow area of ​​the pipeline system itself and will not have a significant impact on the air intake velocity. This avoids a significant negative impact on the air intake pressure, which would affect the air extraction function of the pipeline system itself. Especially when applied to the hot air recovery pipeline of the stenter, it reduces heat loss and thus reduces the energy consumption required for circulating heated air.

[0075] Regarding the specific blowing pressure, currently, the textile industry generally produces a significant amount of lint from polyester fabrics, which generate a large amount of long filaments during production. Some cotton fabrics also produce lint up to 35mm in length. Furthermore, polyester is prone to static electricity due to friction with air, creating additional attraction when it adheres to the filter screen 22. Considering the vertical blowing direction and the reciprocating oscillation method, which means the blowing pressure only briefly affects the lint, it's crucial to prevent the blown-out lint from re-entering the duct with the airflow and re-attaching to the filter screen 22. Therefore, the lint needs to be blown out of the airflow range the instant the air knife 51 passes. This typically requires approximately twice the airflow pressure to completely detach the lint from the filter screen 22.

[0076] For example, if the inlet pressure of the hot air recovery pipe of a certain shaping machine is 780 Pa, then the maximum blowing pressure can reach 1500 Pa.

[0077] The above only addresses the most difficult-to-clean lint situation known to date. However, in some embodiments, the blowing pressure can be more than twice the inlet air pressure. For example, in some customized scenarios, special fabrics are used, making the lint generated more difficult to clean than that of the aforementioned synthetic fibers.

[0078] In some embodiments, the blowing pressure can be controlled. Those skilled in the art can set an appropriate blowing pressure based on the actual fabric type, lint density, or clogging situation to balance blowing energy consumption, compressed gas consumption, and lint removal effect. Without departing from the concept of this embodiment, those skilled in the art can obtain different blowing pressure values ​​through a limited number of experiments.

[0079] In some embodiments, since these lint particles are difficult to form into filaments, or the environment in which the pipe is located is unlikely to have filamentous lint particles, resulting in the absence of filamentous lint particles in the intake airflow, and only some dust particles or very light lint particles are present, or these lint particles are rarely long, then a lower blowing pressure can be selected to ensure that the surface of the filter 22 is almost free of blockage.

[0080] This implementation method creates a way to clean filamentous hairs that is far more effective than vibration and scraping methods, and prevents the filter 22 from being clogged by filamentous hairs.

[0081] In some embodiments, such as Figure 9-10As shown, the air knife 51 includes an air intake plate 511 and a mounting plate 512 that are fixedly connected to each other. The mounting plate 512 is used to attach the air knife 51 to the reciprocating cylinder 41. The outer wall of the air intake plate 511 is provided with at least one air intake hole 5111. The side of the air intake plate 511 near the filter screen 22 is provided with a slit 513. The slit 513 communicates with the air intake hole 5111. The length direction of the slit 513 is perpendicular to the movement direction of the reciprocating swing mechanism 4. The slit 513 is located at the lower part of the side of the air intake plate 511 near the mounting plate 512.

[0082] Based on this embodiment specifically designed for cleaning filamentous hair, the air knife 51 is already a relatively mature existing technology, such as those from brands like KEAIR and SUNAIR. Most of them have a slit 513 as an air outlet 5131, so its specific structure will not be described in detail here.

[0083] In the current method of cleaning the filter screen 22 surface with a scraper, the scraper moves back and forth on the surface of the filter screen 22, allowing the dust on the surface of the filter screen 22 to be scraped off. In actual structural construction, the area where filamentous debris is generated more seriously is generally the hot air recovery duct of the shaping machine. The air inlet 21 of such ducts is usually rectangular, so the filter screen 22 as a whole has a rectangular plate structure, and the length direction of the scraper is parallel to the length direction of the duct.

[0084] Therefore, as a preferred embodiment, the length direction of the slit 513 is perpendicular to the direction of the reciprocating swing mechanism 4, which is essentially equivalent to limiting the length direction of the air knife 51 to be perpendicular to the direction of movement of the air knife 51. In order to allow the surface of the filter screen 22 to receive as much airflow as possible from the air knife 51, the length direction of the reciprocating swing mechanism 4 should be perpendicular to the axis of the air inlet 21 of the duct, so that the air knife 51 can cover the entire area of ​​the filter screen 22 during the reciprocating movement.

[0085] For example, such as Figure 16 Place the individual clogged filters and manually move the air knife 51 back and forth while blowing air onto the lower part of the filter surface for 30 seconds. You can see that there is a clear "layering" phenomenon between the upper and lower parts of the filter, and the clogging of the lower part of the filter is significantly improved, indicating that the air blowing method is effective for clearing the blockage.

[0086] Although, in some other embodiments, the length direction of the air knife 51 may not be parallel to the axis of the pipe.

[0087] Using this implementation method, a method for cleaning the filter screen 22 of the air duct for hot air recovery of the stenter is constructed, so that the entire surface of the filter screen 22 can be covered by the moving range of the air knife 51, thereby ensuring that filamentous debris in any part of the filter screen 22 can be effectively cleaned.

[0088] Example 3:

[0089] Please see Figure 1-10 The present invention provides the following technical solution: a cleaning mechanism for a filter screen 22 for a textile factory air duct, including a base frame 3 for attaching to the inner wall of the air inlet 21 of the duct and a reciprocating cylinder 41 slidably connected to the base frame 3, and an air knife 51 provided on the reciprocating cylinder 41, the air knife 51 being provided with an air blowing port 5131 facing the filter screen 22. The blowing pressure of the air outlet 5131 is 1.3 to 1.95 times the air inlet pressure at the air inlet 21. The blowing direction of the air outlet 5131 is at an angle of 30 to 90° with the plane where the filter screen 22 is located. When the reciprocating cylinder 41 runs, it drives the air knife 51 to move in a plane parallel to the filter screen 22. The surface of the air knife 51 facing the filter screen 22 is V-shaped or U-shaped.

[0090] As an optional implementation of the present invention, compared with embodiment 2, we provide a non-vertical blowing scheme. Although the description of embodiment 1 mentions that the advantage of such inclined blowing is that it can adapt to scenarios where filamentous lint is not so severe, and can "push" dust particles and lint particles to the radial edge of the pipe or outside by the blowing pressure during the movement of the reciprocating oscillating mechanism 4, so that these impurities will not re-adhere to the filter screen 22.

[0091] However, to ensure that these particulate impurities can be successfully blown off the surface of filter 22 and subjected to a radial force in the air, the required blowing pressure cannot be too low. However, it also cannot be too high, otherwise a large amount of air that needs to flow into the pipeline will be blown away, or these particulate impurities will be carried by the airflow to a distant location in the workshop, thus significantly reducing or even causing failure of the required efficiency of the pipeline system itself.

[0092] This method allows the removed dust particles, lint particles, and other impurities to re-attach to the filter 22, improving the cleaning effect without significantly reducing the efficiency of the piping system itself. It is particularly suitable for piping systems with relatively minor or no lint problems.

[0093] Example 4:

[0094] As mentioned in Examples 1 and 2, the clogging problem of filamentous debris in the hot air recovery system of the setting machine is usually the most serious. Figure 12 As can be clearly seen, although the fabric processed by the setting machine does not always produce a particularly large amount of lint, most of the time, the filter 22 still becomes severely clogged when there is no cleaning mechanism. Therefore, we need to provide a dedicated cleaning method for the hot air recovery system of the setting machine.

[0095] Please see Figure 1-4The present invention provides the following technical solution: a hot air recovery pipe for a shaping machine, including a cleaning mechanism of any one of embodiments 1-2, wherein the blowing pressure of the air outlet 5131 is 1.2 to 1.3 times the air inlet pressure at the air inlet 21, and further includes: Supervisor 1 is located above oven A of the shaping machine; Air inlet 2, one end of which is fixedly connected to the air inlet end 11 of the main pipe 1, and the other end of the air inlet 2 is the air inlet 21, which faces the air outlet end A1 of the oven A. Filter 22, which covers and is fixedly connected to the air inlet 21; Gas source 6 is used to supply gas to the air blowing assembly 5; The output of the control module 7 is electrically connected to the input of the reciprocating swing mechanism 4 and the air source 6, respectively.

[0096] As an optional implementation of the present invention, during operation, the main pipe 1 relies on the fan in the hot air recovery system to provide negative pressure, so that the hot air overflowing from port A of the setting machine oven is guided to the air inlet pipe 2 and enters from the air inlet 21. During this process, the filter screen 22 filters out impurities (dust particles, lint) contained in the hot air. These impurities adhere to the surface of the filter screen 22 due to the inlet air pressure, resulting in a reduction in the flow rate of the filter screen 22. By activating the air source 6 and the reciprocating swing mechanism 4, the reciprocating swing mechanism 4 drives the air blowing component 5 to reciprocate and blow air onto the surface of the filter screen 22, so that these impurities are blown out by the airflow with a pressure greater than the inlet air pressure, thereby preventing lint and dust from adhering to the filter screen 22 for a long time and causing blockage of the filter screen 22.

[0097] Furthermore, since the air inlet 21 faces the air outlet A1 of the oven A, and the air inlet pipe 2 is located above the oven A, this means that, from an overall perspective, the air inlet pipe 2 is actually a bent pipe (as shown in the image). Figure 1 As shown), the plane at the air inlet 21 should maintain an angle of 0-45° with the horizontal plane. After the airflow overflows from the air outlet A1 of the oven A, the overall path of the airflow to the upper air inlet 2 is curved (specifically, it can be an arc, and the radius of motion mainly depends on the distance between the air inlet 2 and the port of the oven A and the air inlet pressure). Therefore, when the blowing pressure is sufficient, the trajectory of the impurities blown out by the blowing assembly 5 starts along the direction perpendicular to the plane of the filter screen 22 and passes through an arc that bends towards the air outlet of the oven A.

[0098] like Figure 1 As shown, F1 represents the movement path of hot air from the oven A to the air inlet pipe 2, F2 represents the blowing direction, F3 represents the movement direction of impurities, and F4 represents the movement direction of hot air within this recovery pipe. If the blowing pressure is not particularly high, the dust and lint near the lowest end of the filter screen 22 will be brought back to the surface of the filter screen 22 by the intake gas, and will be blown out again when the blowing assembly 5 passes by next time, until it is completely removed from the radial outside of the air inlet pipe 2 (the highest end of the filter screen 22). If the blowing pressure is greater, and the angle between the filter 22 and the horizontal plane is larger, the impurities may move directly outside the range of the air inlet 21, although this method will result in greater loss of hot air.

[0099] Of course, those skilled in the art can select the appropriate blowing pressure based on the actual dandruff situation.

[0100] This implementation method provides a targeted cleaning solution for lint, dust and other impurities in the hot air recovery system of the stenter, which can effectively keep the surface of the filter screen 22 free from clogging and adhesion for a long time, enabling the hot air recovery system of the stenter to operate efficiently for a long time.

[0101] In some embodiments, such as Figure 5 As shown, the air source 6 is connected to the reciprocating cylinder 41 and the air blowing assembly 5 respectively.

[0102] As an optional implementation of the present invention, the blowing pressure of the blowing assembly 5 must exceed the air inlet pressure, so the blowing gas is usually selected as compressed gas, so the air source 6 should also be selected as a compressor. The reciprocating cylinder 41 is also implemented based on pneumatic means, so the air source 6 can supply gas to the reciprocating cylinder 41 and the blowing assembly 5 respectively.

[0103] Although the air pressures used by the two components differ greatly, the same compressor can still supply air directly to the two air-consuming components through a flow valve or an air storage cylinder; although in some embodiments, air can also be supplied by two separate compressors.

[0104] The advantage of using a reciprocating cylinder 41 to realize the reciprocating motion of the air blowing component 5 is that the response is faster, making the air blowing component 5 move faster. Moreover, the existing magnetically coupled rodless cylinder (such as RMT-16X500-SA(0)_rod) has a relatively small overall obstruction area. Compared with the lead screw, scissor frame and other methods, it can reduce the dependence on the customized air inlet pipe 2, and can be directly installed in the existing air inlet pipe 2 without causing a large impact on the air intake flow. It also makes the single movement time of the air blowing component 5 shorter, so the impact on the hot air intake efficiency is relatively lower.

[0105] Using this implementation method, an air inlet pipe 2 with low heat loss is constructed, which is suitable for the heat recovery system of a stenter.

[0106] In some embodiments, such as Figure 11As shown, it also includes a timer 8, a first solenoid valve 91 and a second solenoid valve 92. The timer 8 is electrically connected to the controller, and the input ends of the two solenoid valves are electrically connected to the output end of the controller. The first solenoid valve 91 is connected through between the compressor and the blowing assembly 5, and the second solenoid valve 92 is connected through between the compressor and the reciprocating cylinder 41.

[0107] As an optional implementation of the present invention, although the operation of the two gas-consuming components can be controlled directly by controlling the gas output of the compressor itself, this method requires that the gas delivery pipeline be not too long, otherwise it is easy to cause problems with insufficient control accuracy, such as changes in the pressure of the compressed gas in the gas delivery pipeline. However, by using a solenoid valve to control the receiving of compressed gas by the air blowing assembly 5 and the reciprocating cylinder 41, the problem of changes in the compressed gas pressure in the gas pipeline can be effectively avoided, thereby improving the control of the air blowing assembly 5 and the reciprocating swing mechanism 4.

[0108] In addition, the introduction of timer 8 allows the cleaning mechanism to perform periodic blowing actions according to the set time. Although technicians can adjust the cycle according to the actual situation, the energy consumption of the cleaning mechanism is further saved while still meeting the cleaning effect.

[0109] In some embodiments, the filter 22 has a mesh count of 20.

[0110] As an optional implementation of the present invention, for the hot air recovery system of the setting machine, the filter screen 22 used at the air inlet 21 typically has a mesh size of 20. The pores are relatively fine, but larger than other filters in a textile workshop. This is because after the opening and carding processes, very little dust remains on the fabric surface during the setting process, and the setting process is a relatively enclosed environment, so the dust generated is not significant compared to that commonly found in textile workshops. In this case, the setting process primarily produces filamentous lint and larger fiber dust particles, so a 20-mesh filter screen 22 is suitable for most hot air recovery systems of setting machines.

[0111] This implementation method is easy to apply in most hot air recovery systems for stenters.

[0112] Comparative Example 1: Compared to Example 1, the blowing assembly 5 is entirely replaced with the existing scraper.

[0113] Comparative Example 2: Compared to Example 1, a vibration motor (Hongda ZFB-3, 2.2kw, speed 2970rpm) is installed at the air inlet 21, and the output end of the vibration motor is connected to the filter 22 at the air inlet 21.

[0114] Experimental example: 20 mesh A 20-mesh filter 22 is installed at the air inlet duct 2 of the hot air recovery system of the setting machine. The filter 22 is made of 304 stainless steel and has an overall length and width of 446*446mm, the same as the inlet duct 2. The air inlet flow rate of the air inlet duct 2 is 6000. / h, air inlet pressure is 780Pa. The shaped fabric is made of cotton yarn.

[0115] Experimental Group 1: The cleaning mechanism described in Example 1 is installed in the air inlet duct 2; The blowing pressure of the air blowing component 5 is 1000Pa, the reciprocating oscillation frequency is 10s / time, and the stroke speed of the reciprocating oscillation mechanism 4 is 0.7m / s.

[0116] Experimental group 2: The cleaning mechanism described in Example 1 is installed in the air inlet duct 2.

[0117] Among them, the blowing pressure of the air blowing component 5 is 900Pa, the reciprocating oscillation frequency is 10s / time, and the stroke speed of the reciprocating oscillation mechanism 4 is 0.7m / s.

[0118] Experimental group 3: The cleaning mechanism described in Example 1 is installed in the air inlet duct 2; Among them, the blowing pressure of the air blowing component 5 is 1500Pa, the reciprocating oscillation frequency is 10s / time, and the stroke speed of the reciprocating oscillation mechanism 4 is 0.7m / s.

[0119] Control group 1: The cleaning mechanism from Comparative Example 1 is installed in the air inlet duct 2.

[0120] The frequency of the scraper's reciprocating oscillation is 10s / time, and the stroke speed of the reciprocating oscillation mechanism 4 is 0.7m / s.

[0121] Control group 2: The cleaning mechanism from Comparative Example 2 is installed in the air inlet duct 2.

[0122] The vibration frequency of filter 22 is 50Hz.

[0123] Control group 3: No cleaning services are used.

[0124] Experimental methods: After running the above experimental groups 1-3 and control groups 1-3 without any maintenance, the area of ​​the blocked area was calculated in real time using a camera (360 PTZ camera 8Max), and the power consumption of the heating components in the hot air recovery system was measured in real time using an electricity meter. The following experimental data were obtained: Table 1: Clogging status of filter 22 after operation of each cleaning mechanism:

[0125] Table 2: Energy consumption growth rate of heating components in the hot air recovery system after operation of each cleaning unit, assuming no blockage:

[0126] As can be seen from Tables 1 and 2, when the blowing pressure is 1000Pa, both the blockage situation and the energy consumption growth rate of the heating element are optimal, and it can maintain a low blockage situation and low energy consumption for a long time.

[0127] When the blowing pressure is 900Pa, some blockages can be seen after long-term operation. When the blowing pressure is 1000Pa, the blockages are significantly reduced. Although there are few blockages, these blockages can still be cleared later.

[0128] When using the scraper method, we can see that severe blockage occurred after 12 hours of operation. After 24 hours, the entire filter 22 was almost completely blocked, and the entire hot air recovery system could no longer take in air. Therefore, the hot air recovery system had to be forcibly shut down.

[0129] The vibration method resulted in the most severe blockages. We found that the vibration method could no longer function after 3 hours, and the hot air recovery system had to be forcibly shut down.

[0130] As can be seen from Tables 1 and 2, although the cleaning effect is best when the blowing pressure is higher, the heat recovery system has higher losses from the beginning than the 900-1000Pa pressure method. This is because the excessive blowing pressure causes some hot air to be blown out and cannot enter the air inlet 21, so the amount of hot air is lost. The heating components in the heat recovery system have to increase energy consumption to make up for the lost heat energy, but overall the amount of hot air loss is still low and the increase in energy consumption is not significant.

[0131] Conclusion: Compared with existing vibration and scraper methods, the air blowing method has a significant cleaning effect in scenarios with serious filamentous lint, such as the hot air recovery system of the stenter. It can greatly reduce the probability of filter 22 being clogged, maintain the long-term efficient operation of the hot air recovery system of the stenter, greatly reduce maintenance requirements, and also significantly reduce the impact on the energy consumption of the hot air recovery system.

[0132] The working principle and usage process of this invention are as follows: When air enters the duct, the air in the textile workshop, along with lint and dust, is drawn into the duct. The filter screen 22 blocks these larger dust particles and lint. When the reciprocating swing mechanism 4 and the air blowing assembly 5 are running, the reciprocating swing mechanism 4 drives the air blowing assembly 5 to swing back and forth, blowing air from the air inlet 21 onto the surface of the filter screen 22. At this time, the blowing direction is opposite to the air intake direction, and the air pressure of the blowing direction is greater than that of the air intake direction. Therefore, under the combined force of the two air forces, the dust particles and lint can move towards the filter screen 22. Thus, the dust particles and lint that are blocked or stuck on the filter screen 22 can be removed from the filter screen 22 by the air blowing force, thereby realizing the cleaning function of various dust and lint on the filter screen 22.

[0133] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A filter cleaning mechanism for air ducts in textile factories, comprising a base frame for attaching to the inner wall of the air inlet of the duct and a reciprocating swing mechanism slidably connected to the base frame, wherein, It also includes an air blowing assembly mounted on a reciprocating swing mechanism, the air blowing assembly having an air blowing port facing the filter screen; The blowing pressure at the air outlet is greater than the air inlet pressure. When the reciprocating swing mechanism is running, it drives the air blowing assembly to move back and forth in the air inlet and blow air onto the filter.

2. The cleaning mechanism according to claim 1, wherein, The surface of the air blowing assembly facing the filter screen is V-shaped or U-shaped.

3. The cleaning mechanism according to claim 1 or 2, wherein, The air blowing component is an air knife.

4. The cleaning mechanism according to claim 3, wherein, The air blowing assembly includes an air inlet plate and a mounting plate that are fixedly connected to each other. The mounting plate is used to attach the air blowing assembly to the reciprocating swing mechanism. The outer wall of the air intake plate is provided with at least one air intake hole, and the side of the air intake plate near the filter screen is provided with a slit, which is connected to the air intake hole, and the length direction of the slit is perpendicular to the movement direction of the reciprocating swing mechanism.

5. The cleaning mechanism according to claim 4, wherein, The slit is located on the lower part of the side of the air intake plate closest to the mounting plate.

6. The cleaning mechanism according to claim 1, wherein, The blowing pressure at the air inlet is 1.15 to 1.95 times the air inlet pressure.

7. The cleaning mechanism according to claim 1, wherein, The direction of air blowing from the air outlet is perpendicular to the plane where the filter screen is located.

8. The cleaning mechanism according to claim 1, wherein, The reciprocating swing mechanism is a reciprocating cylinder.

9. A hot air recovery duct for a setting machine, comprising the cleaning mechanism according to any one of claims 1 to 8, wherein, Also includes: The main supervisor is located above the oven of the shaping machine; An air inlet duct, one end of which is fixedly connected to the air inlet end of the main pipe, and the other end of which is an air inlet facing the air outlet end of the oven. A filter screen, which covers and is fixedly connected to the air inlet; Gas source, used to supply gas to the air blowing assembly; The control module has its output terminals electrically connected to the reciprocating swing mechanism and the input terminal of the air source, respectively.

10. The cleaning mechanism according to claim 9, wherein, The blowing pressure at the air inlet is 1.2 to 1.3 times the air inlet pressure.

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