A green ventilation and dust filtering device for mine tunnel excavation

Abstract

The invention discloses a green mine tunnel excavation ventilation and dust filtering device, including an air intake mechanism for pressing airflow into the tunnel, a track is arranged at the top of the tunnel, an exhaust mechanism and a driving mechanism are installed below the track and move forward and backward along the track, and the exhaust mechanism includes an air collecting box, a longitudinal air duct, a transverse air duct, a dust collector, a dust removal fan and an air outlet duct arranged in sequence from front to back. The invention is easy to install and control, the air intake mechanism presses fresh airflow into the tunnel from back to front, after the airflow hits the excavation working face, it spreads to both sides in the vertical plane, and then pushes the air to flow backward; the dust generated by the excavation working face is sucked into the air collecting box when it spreads in the vertical plane, enters the dust collector for filtration through the longitudinal air duct and the transverse air duct, and the filtered air is discharged backward from the air outlet duct; the reverse airflow of the air intake mechanism and the exhaust mechanism accelerates the circulation of air in the tunnel, ensures the airflow quality underground, and improves the environment of the coal mine tunnel.

Description

Technical Field

[0001] The invention belongs to the technical field of ventilation and dust removal in mine tunnel engineering, and in particular relates to a ventilation and dust filtering device for green mine tunnel excavation. Background Art

[0002] my country is rich in mineral resources, and coal, metals and other mineral resources are mostly mined underground. With the development of my country's economy, the demand for coal, metals and other resources is increasing. Shallow resources have basically been mined out, and underground mining needs to be further transferred to deeper areas. The prerequisite for working underground is to maintain a good ventilation environment, dilute and discharge toxic, asphyxiating, and explosive gases and dust underground, and ensure that the quality and quantity of the underground airflow meet national safety and health standards. In newly built, expanded or in-production mines, a large number of shaft and tunnel ventilation projects are often required to prepare for production.

[0003] During the tunnel excavation process, in order to dilute and discharge the harmful gases gushing out from the coal (rock) mass, the blasting smoke and dust produced by blasting, and at the same time create good climatic conditions, local ventilators are used for ventilation. The local ventilators press fresh air into the tunnel through the air supply duct and send it to the excavation working face. The wind from the working face contains a large amount of dust and other harmful gases and returns along the tunnel and is discharged from the excavation tunnel.

[0004] However, when the tunnel boring machine is working on the excavation face, the dust concentration in the tunnel is extremely high, and the unfixed dust source generated moves forward. The dust removal effect is not ideal when using dust prevention measures such as water spraying, dust curtains, and wet dust collectors. Due to the limited height and width of underground tunnels and the relatively concentrated production equipment on the excavation face, the space available for the filter is narrow, so the existing filter placement method cannot be applied to tunnel excavation. Poor ventilation or dust removal will result in a large amount of coal and rock dust and blasting smoke generated on the excavation face that cannot be taken away in time, resulting in a serious excess of dust concentration on the working face. Therefore, it is urgent to design a ventilation and dust filtration device that can reduce the dust concentration in the tunnel and is easy to move. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a green ventilation and dust filtering device for mine tunnel excavation, which collects and purifies the dust generated by the excavation working face while ensuring ventilation through an air intake mechanism and an exhaust mechanism.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A green mine tunnel excavation ventilation and dust filtering device comprises an air intake mechanism for pressing air flow into the tunnel, the air intake mechanism comprises a ventilator and an air supply duct, with the air flow direction in the air supply duct as the front; a track extending in the front-rear direction is provided at the top of the tunnel, an exhaust mechanism and a driving mechanism that drives the exhaust mechanism to move forward and backward along the track are installed under the track, the exhaust mechanism comprises an air collection box, a longitudinal air duct, a transverse air duct, a dust collector, a dust removal fan and an air outlet duct which are arranged in sequence from front to back; the upper and lower ends of the longitudinal air duct are closed, the front side of the longitudinal air duct is open, and the front side of the longitudinal air duct is provided with left and right opposite slideways, the two slideways are respectively fixed on the left and right sides of the longitudinal air duct, and the slideways extend in the longitudinal direction, the rear side of the air collection box is embedded in the slideway, and the air collection box can move up and down along the slideway; the rear side of the air collection box is open, and the rear side of the air collection box is connected to the longitudinal air duct, and an air intake is provided on one side of the air collection box The vent, two upper and lower corresponding front rollers are arranged on the front side of the air collecting box, the front rollers are located in front of the air inlet, and two upper and lower corresponding rear rollers are arranged on the rear side of the air collecting box, the front rollers and the rear rollers are extended in the left and right directions, and a sealing rubber plate is arranged on the front sides of the upper and lower front rollers, the upper ends of the sealing rubber plates bypass the upper side of the upper front roller and the lower side of the upper rear roller, and extend upward from the rear side of the upper rear roller, the lower ends of the sealing rubber plates bypass the lower side of the lower front roller and the upper side of the lower rear roller, and extend downward from the rear side of the lower rear roller, and the sealing rubber plate located outside the air collecting box is covered on the front side port of the longitudinal air duct; the rear side of the longitudinal air duct is connected with the front end of the transverse air duct, and the rear end of the transverse air duct is connected with the inlet of the dust collector, a plurality of filter cartridges for filtering air are arranged in the dust collector, the outlet of the dust collector is connected with the air inlet of the dust removal fan, and the air outlet of the dust removal fan is connected to the air outlet duct.

[0008] Preferably, the driving mechanism is suspended on a track and can move along the track; a connecting plate is installed on the front side of the driving mechanism, and the connecting plate extends forward and is connected to the rear side of the longitudinal air duct. The tops of the longitudinal air duct, the transverse air duct, the dust collector and the air outlet duct are all provided with connecting rods. Except for the connecting rod above the longitudinal air duct, the remaining connecting rods all pass through the connecting plate upward, and the tops of the connecting rods are suspended on the track, and the tops of the connecting rods are slidably connected to the track.

[0009] Preferably, the air collecting box is formed by seamlessly splicing an upper side panel, a front side panel, a lower side panel, a left side panel and a right side panel, the bottom of the left side panel and the bottom of the right side panel are both provided with sliders facing outward, the left and right sliders are respectively embedded in the left and right slideways, and the rear ends of the upper side panel and the lower side panel are both in contact with the front side of the sealing rubber plate.

[0010] Preferably, the filter cartridge in the dust collector is formed by folding and rolling filter material, the filter material uses polyester fiber non-woven fabric as the base fabric, and the dust-facing surface of the base fabric is coated with bentonite / polytetrafluoroethylene composite material.

[0011] Preferably, the preparation method of the filter material comprises the following steps: (1) adding polyvinyl alcohol to water, stirring until dissolved, then adding bentonite, stirring for 1 to 5 minutes, and ultrasonically dispersing for 5 to 10 minutes to obtain a bentonite dispersion; wherein the amount of polyvinyl alcohol added to the water is 0.15 to 5 g / L, and the amount of bentonite added is 15 to 25 g / L;

[0012] (2) Mixing the polytetrafluoroethylene dispersion emulsion and the bentonite dispersion obtained in step (1) at a weight ratio of 1:(5-10), stirring for 20-30 min, and ultrasonicating for 20-30 min to obtain a mixed emulsion; wherein the solid content of the polytetrafluoroethylene dispersion emulsion is 58-62%;

[0013] (3) The mixed emulsion obtained in step (2) is evenly coated on the surface of the base fabric by spraying or scraping, and then dried and shaped by a tenter drying and shaping machine, and cooled to room temperature to obtain a filter material.

[0014] Preferably, the coating thickness of the mixed emulsion on the surface of the base fabric in step (3) is 10-30 μm.

[0015] Furthermore, the drying temperature of the stenter drying and setting machine in step (3) is 150-250° C., and the setting speed is 5-8 m / min.

[0016] The ventilation and dust filtering device described in the present invention is easy to install and control, and the air intake mechanism presses fresh air flow into the tunnel from the back to the front. After the air flow hits the excavation working face, it spreads to both sides in the vertical plane, and then pushes the air to flow backward; the front end of the exhaust mechanism is close to the excavation working face, and the exhaust mechanism is arranged on one side of the air intake mechanism. When the dust generated by the excavation working face is scattered in the vertical plane, it is sucked into the air collecting box, and enters the dust collector for filtration through the longitudinal air duct and the transverse air duct, and the filtered air is discharged backward from the air outlet duct; the exhaust mechanism can move forward and backward along the track, and the air collecting box can move up and down along the slide, so that the overall device is more applicable; the reverse airflow of the air intake mechanism and the exhaust mechanism accelerates the circulation of air in the tunnel, and a large amount of coal rock dust and blasting smoke generated by the excavation face are taken away in time, ensuring the airflow quality underground and greatly improving the environment of the coal mine tunnel.

[0017] The filter material used in the filter cartridge in the dust collector is attached with a layer of bentonite / polytetrafluoroethylene composite material on the surface. It is not only resistant to high temperatures, but also its extremely small sieve holes can block most submicron dust particles. The submicron dust particles gather on the surface of the filter material and form a permeable dust cake. Most dust particles are blocked on the outer surface of the filter material and cannot enter the interior of the filter material. They can be removed promptly and effectively under the blowing of compressed air. The filtration efficiency can reach more than 99.9%, and the bentonite / polytetrafluoroethylene coating treatment can increase the service life of the filter material and reduce the operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention;

[0019] Figure 2 yes Figure 1 An enlarged schematic diagram of the central air box and the longitudinal air duct;

[0020] Figure 3 yes Figure 2 Section along line AA;

[0021] Figure 4 yes Figure 2 A top view of

[0022] Figure 5 yes Figure 4 Section along line BB;

[0023] Figure 6 yes Figure 2 Left view of the central bellows;

[0024] Figure 7 yes Figure 6 (right) axonometric view;

[0025] Figure 8 yes Figure 6 (Left) Axonometric view of. DETAILED DESCRIPTION

[0026] In order to make the technical purpose, technical scheme and beneficial effects of the present invention clearer, the technical scheme of the present invention is further described below in conjunction with specific embodiments. However, the embodiments are intended to explain the present invention and cannot be understood as limiting the present invention. If no specific technology or conditions are specified in the embodiments, the technology or conditions described in the literature in the field or the product manual shall be followed.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] like Figures 1 to 8As shown, a green mine tunnel excavation ventilation and dust filtering device, with the direction indicated by arrow F as the front, includes an air intake mechanism for pressing air flow into the tunnel 1, the air intake mechanism includes a ventilator and an air supply duct 3 extending in the front-to-back direction, and the air flow direction (arrow I) in the air supply duct 3 is forward, which is the same direction as arrow F. A track 4 extending in the front-to-back direction is arranged at the top of the tunnel 1, and an exhaust mechanism and a driving mechanism 5 driving the exhaust mechanism to move forward and backward along the track 4 are installed below the track 4. The track 4 and the driving mechanism 5 can adopt a monorail crane. The exhaust mechanism is located on the right side of the air intake mechanism, and the exhaust mechanism includes an air collecting box 6, a longitudinal air duct 7, a transverse air duct 8, a dust collector 9, a dust removal fan 11 and an air outlet duct 12 arranged in sequence from front to back. The driving mechanism 5 is suspended on the track 4, and the driving mechanism 5 can move along the track 4. The air intake mechanism, the track 4 and the driving mechanism 5 can all adopt conventional technical means in the field, which is not the innovation of the present invention, so it will not be described in detail.

[0029] The upper and lower ends of the longitudinal air duct 7 are closed, the front side of the longitudinal air duct 7 is open, and the cross section of the longitudinal air duct 7 is a U-shaped groove, and the U-shaped groove is bent inward at a right angle at the groove. The air collecting box 6 is seamlessly spliced ​​by the upper side plate 601, the front side plate 602, the lower side plate 603, the left side plate 604 and the right side plate 605. The left side plate 604 is provided with an air inlet 19. The rear side of the air collecting box 6 is open, and the rear side of the air collecting box 6 is connected to the longitudinal air duct 7. The front side of the longitudinal air duct 7 is provided with left and right opposite slides 15, the cross-section of the slide 15 is L-shaped, the two slides 15 are respectively fixed on the left and right sides of the longitudinal air duct 7, and the slide 15 extends in the longitudinal direction; the bottom of the left plate 604 and the bottom of the right plate 605 are both provided with sliders 606 outwardly, the cross-section of the slider 606 is rectangular, the left and right sliders 606 are respectively embedded in the left and right slides 15, the front side surface of the slider 606 is in contact with the inner side surface of the slide 15, and the rear side surface of the slider 606 is in contact with the front side surface of the longitudinal air duct 7, and the air collecting box 6 moves up and down along the slide 15 through the slider. Two upper and lower corresponding front rollers 17 are arranged on the front inner side of the air collecting box 6, and the front rollers 17 are located in front of the air inlet 19. Two upper and lower corresponding rear rollers 18 are arranged on the rear inner side of the air collecting box 6, and the front rollers 17 and the rear rollers 18 both extend in the left and right directions. A sealing rubber plate 16 is arranged on the front sides of the upper and lower front rollers 17, and the upper ends of the sealing rubber plates 16 bypass the upper sides of the upper front rollers 17 and the lower sides of the upper rear rollers 18, and extend upward from the rear sides of the upper rear rollers 18, and the lower ends of the sealing rubber plates 16 bypass the lower sides of the lower front rollers 17 and the upper sides of the lower rear rollers 18, and extend downward from the rear sides of the lower rear rollers 18. The sealing rubber plate 16 located outside the air collecting box 6 is covered on the front side ports of the longitudinal air duct 7, and the rear ends of the upper side plates 601 and the lower side plates 603 are both in contact with the front side faces of the sealing rubber plates 16. Rubber pads may be provided at the upper and lower ends of the slideway 15 to tighten and fix the sealing rubber plate 16 .

[0030] The air collecting box 6 is located above the tunnel boring machine 2, the rear side of the longitudinal air duct 7 is connected to the front end of the transverse air duct 8, the rear end of the transverse air duct 8 is connected to the inlet of the dust collector 9, and a plurality of filter cartridges 10 for filtering air are arranged in the dust collector 9. The filter cartridges 10 adopt a bottom air intake and external filtering method. The outlet of the dust collector 9 is connected to the air inlet of the dust removal fan 11, and the air outlet of the dust removal fan 11 is connected to the air outlet duct 12. The dust and gun smoke generated by the tunnel boring machine 2 enter the air collecting box 6 through the air inlet 19, and then pass through the longitudinal air duct 7, the transverse air duct 8, the dust collector 9, the dust removal fan 11 and the air outlet duct 12 from the rear side of the air collecting box 6 in sequence, and the airflow direction (arrow O) in the exhaust mechanism is backward.

[0031] A connecting plate 13 is installed on the front side of the driving mechanism 5. The connecting plate 13 extends forward and is connected to the rear side of the longitudinal air duct 7. The tops of the longitudinal air duct 7, the transverse air duct 8, the dust collector 9 and the air outlet duct 12 are all provided with connecting rods 14. Except for the connecting rod 14 above the longitudinal air duct 7, the other connecting rods 14 all pass through the connecting plate 13 upward. The top of the connecting rod 14 is hung on the track 4, and the top of the connecting rod 14 is slidably connected to the track 4 (the existing conventional sliding connection method can be adopted). When the driving mechanism 5 is working, it moves forward and backward along the track 4, and the exhaust mechanism moves forward and backward synchronously under the push and pull of the connecting plate 13.

[0032] The dust collector 9 adopts a conventional dry dust collector for mining (such as Futong KCG-550D), and the filter cartridge 10 provided in the dust collector 9 is formed by folding and rolling filter material, and the filter material adopts polyester fiber non-woven fabric as the base fabric, and the dust-facing surface of the base fabric is coated with bentonite / polytetrafluoroethylene composite material. The preparation method of the filter material comprises the following steps:

[0033] (1) Add polyvinyl alcohol to water, stir until dissolved, then add bentonite, stir for 3 min, and ultrasonically disperse for 7 min to obtain a bentonite dispersion; wherein the amount of polyvinyl alcohol added to the water is 2 g / L, and the amount of bentonite added is 18 g / L;

[0034] (2) mixing the polytetrafluoroethylene dispersion emulsion and the bentonite dispersion obtained in step (1) at a weight ratio of 1:7, stirring for 25 minutes, and ultrasonicating for 25 minutes to obtain a mixed emulsion; wherein the solid content of the polytetrafluoroethylene dispersion emulsion is 58-62%;

[0035] (3) The mixed emulsion obtained in step (2) is uniformly coated on the surface of the base fabric by spraying or scraping, with a coating thickness of 20 μm; then, it is dried and shaped by a tenter drying and shaping machine, and cooled to room temperature to obtain a filter material; wherein the drying temperature of the tenter drying and shaping machine is 190° C. and the shaping speed is 6 m / min.

[0036] The raw materials used in the above preparation steps are all common commercially available products. Among them, the polyester fiber non-woven fabric was purchased from Guangzhou Wangtao Filter Equipment Technology Co., Ltd. (model WT216), with a fixed weight of 160 g / m 2 , thickness 0.45 mm; the polyvinyl alcohol uses Sanwei brand 088-20 (model PVA 1788), with a degree of alcoholysis of 87.0-89.0%, an average degree of polymerization of 1650-1850, a molecular weight of 72600-81400, and a particle size of 160 mesh; the polytetrafluoroethylene dispersion emulsion uses Juhua brand JUFLON (brand JF-4DCD), with a solid content of 58-62%, a surfactant content of 4.0-7.0%, and a viscosity of 20-40×10 -3Pa·S; the bentonite was purchased from Hongcheng Bentonite Factory in Pingqiao District, Xinyang City, with a particle size of 220~325 mesh and a density of 1.58 g / cm 3 .

[0037] The physical properties of the filter material before and after the polyester fiber non-woven fabric surface modification (coating with bentonite / polytetrafluoroethylene) were tested. The results are as follows: The air permeability of the original polyester fiber non-woven fabric filter material is 250 L / m 2 ·s, the filtration accuracy is 5 μm; after the mixed emulsion surface is coated, the air permeability is 170 L / m 2 ·s, the filtration accuracy is 1 μm.

[0038] When the dust collector 9 and the dust removal fan 11 are closed, the exhaust mechanism does not exhaust air, and the dust concentration in the tunnel 1 is only affected by the outlet position of the air supply duct 3. When the outlet of the air supply duct 3 is close to the excavation working face, the dust generated by the excavation working face is blown away by the airflow, and a large amount of dust is scattered to the rear of the tunnel 1 with the airflow. As the distance between the outlet of the air supply duct 3 and the excavation working face increases, the total dust and respirable dust concentrations in the rear of the tunnel 1 gradually decrease. After turning on the dust collector 9 and the dust removal fan 11, the dust concentration in the tunnel 1 is affected by the combined effect of the outlet position of the air supply duct 3 and the position of the air inlet 19 of the air collecting box 6. When the air inlet 19 of the air collecting box 6 is 3 m away from the excavation working face and the outlet of the air supply duct 3 is 12 m away from the excavation working face, the total dust concentration at a position 1.5 m from the ground and 2.5 m from the excavation working face is 198.36 mg / m 3 The total dust concentration at a distance of 1.5 m from the ground and 15 m from the excavation face is 19.20 mg / m 3 The total dust concentration at a distance of 1.5 m from the ground and 30 m from the excavation face is less than 2 mg / m 3 , which shows that the ventilation and dust filtering device of the present invention can effectively improve the environment in the tunnel 1 through the cooperation of the air intake mechanism and the exhaust mechanism.

Claims

1. A green mine tunnel excavation ventilation and dust filtering device, comprising an air intake mechanism for pressing air flow into the tunnel, the air intake mechanism comprising a ventilator and an air supply duct, with the air flow direction in the air supply duct as the front; characterized in that: A track extending in the front-to-back direction is provided at the top of the alley, and an exhaust mechanism and a driving mechanism for driving the exhaust mechanism to move forward and backward along the track are installed under the track, and the exhaust mechanism includes an air collecting box, a longitudinal air duct, a transverse air duct, a dust collector, a dust removal fan and an air outlet duct which are arranged in sequence from front to back; the upper and lower ends of the longitudinal air duct are closed, and the front side of the longitudinal air duct is open, and the front side of the longitudinal air duct is provided with left and right opposite slides, the two slides are respectively fixed to the left and right sides of the longitudinal air duct, and the slides extend longitudinally, the rear side of the air collecting box is embedded in the slide, and the air collecting box can move up and down along the slide; the rear side of the air collecting box is open, and the rear side of the air collecting box is connected with the longitudinal air duct, an air inlet is provided on one side of the air collecting box, and two upper and lower corresponding front rollers are provided on the front side of the air collecting box, and the front rollers are located at the air inlet In front of the air collecting box, two upper and lower corresponding rear rollers are arranged on the rear side of the air collecting box, and the front rollers and the rear rollers extend in the left and right directions. A sealing rubber plate is arranged on the front sides of the upper and lower front rollers, and the upper end of the sealing rubber plate bypasses the upper side of the upper front roller and the lower side of the upper rear roller, and extends upward from the rear side of the upper rear roller, and the lower end of the sealing rubber plate bypasses the lower side of the lower front roller and the upper side of the lower rear roller, and extends downward from the rear side of the lower rear roller, and the sealing rubber plate outside the air collecting box is covered on the front port of the longitudinal air duct; the rear side of the longitudinal air duct is connected with the front end of the transverse air duct, and the rear end of the transverse air duct is connected with the inlet of the dust collector, and a plurality of filter cartridges for filtering air are arranged in the dust collector, the outlet of the dust collector is connected with the air inlet of the dust removal fan, and the air outlet of the dust removal fan is connected to the air outlet duct.

2. The green mine tunnel excavation ventilation and dust filtering device according to claim 1 is characterized in that: The driving mechanism is suspended on the track and can move along the track; a connecting plate is installed on the front side of the driving mechanism, and the connecting plate extends forward and is connected to the rear side of the longitudinal air duct. The tops of the longitudinal air duct, the transverse air duct, the dust collector and the air outlet duct are all provided with connecting rods. Except for the connecting rod above the longitudinal air duct, the other connecting rods all pass through the connecting plate upward, and the tops of the connecting rods are suspended on the track, and the tops of the connecting rods are slidably connected to the track.

3. The green mine tunnel excavation ventilation and dust filtering device according to claim 1 is characterized in that: The air collecting box is formed by seamlessly splicing an upper side panel, a front side panel, a lower side panel, a left side panel and a right side panel. Sliders are provided outwardly at the bottom of the left side panel and the bottom of the right side panel. The left and right slides are respectively embedded in the left and right slide rails. The rear ends of the upper side panel and the lower side panel are both in contact with the front side of the sealing rubber plate.

4. The green mine tunnel excavation ventilation and dust filtering device according to claim 1 is characterized in that: The filter cartridge in the dust collector is formed by folding and rolling filter material, the filter material uses polyester fiber non-woven fabric as the base fabric, and the dust-facing surface of the base fabric is coated with bentonite / polytetrafluoroethylene composite material.

5. The ventilation and dust filtering device for green mine tunnel excavation according to claim 4 is characterized in that: The preparation method of the filter material comprises the following steps: (1) adding polyvinyl alcohol to water, stirring until dissolved, then adding bentonite, stirring for 1 to 5 minutes, and ultrasonically dispersing for 5 to 10 minutes to obtain a bentonite dispersion; wherein the amount of polyvinyl alcohol added to the water is 0.15 to 5 g / L, and the amount of bentonite added is 15 to 25 g / L; (2) Mixing the polytetrafluoroethylene dispersion emulsion and the bentonite dispersion obtained in step (1) at a weight ratio of 1:(5-10), stirring for 20-30 min, and ultrasonicating for 20-30 min to obtain a mixed emulsion; wherein the solid content of the polytetrafluoroethylene dispersion emulsion is 58-62%; (3) The mixed emulsion obtained in step (2) is evenly coated on the surface of the base fabric by spraying or scraping, and then dried and shaped by a tenter drying and shaping machine, and cooled to room temperature to obtain a filter material.

6. The green mine tunnel excavation ventilation and dust filtering device according to claim 5 is characterized in that: In step (3), the coating thickness of the mixed emulsion on the surface of the base fabric is 10-30 μm.

7. The green mine tunnel excavation ventilation and dust filtering device according to claim 5 or 6, characterized in that: The drying temperature of the stenter drying and setting machine in step (3) is 150-250°C, and the setting speed is 5-8 m / min.

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