Waste gas filtering device for production of protective film

Abstract

The invention relates to the technical field of waste gas treatment, in particular to a protective film production waste gas filtering device which comprises a vertically-arranged filtering cylinder, a winding mechanism, an unwinding mechanism, a switching mechanism and a filtering film, and the winding mechanism, the unwinding mechanism, the switching mechanism and the filtering film are inserted into the filtering cylinder. The winding end is wound on the winding mechanism, and the unwinding end is wound on the unwinding mechanism; the part, between the winding mechanism and the switching mechanism, of the filtering membrane forms a conical shape, the filtering membrane is configured to have a first state and a second state, in the first state, the small end of the conical shape of the filtering membrane is arranged downwards, and at the moment, the filtering membrane can vibrate through winding of the winding mechanism, so that impurities on the filtering membrane can be shaken off, and the filtering membrane can be separated from the filtering membrane; in the first state, the filter membrane can be replaced by a new filter membrane, and in the second state, the conical small end of the filter membrane faces upwards; the switching mechanism is used for switching the state of the filtering membrane.

Description

Technical Field

[0001] The invention relates to the technical field of waste gas treatment, in particular to a waste gas filtering device for protective film production. Background Art

[0002] Protective film is a cold-mounted film used to protect the screen and body, and is widely used in electronic devices such as smartphones and tablets. According to different needs and functions, protective film can be divided into many types, including anti-peep film, high-transparency and anti-scratch film, tempered film, diamond film, frosted film, mirror film, 3D film, color film, embossed film and anti-blue light film, etc.

[0003] In the process of producing the protective film, the film body needs to be polished. During the polishing, a large amount of particulate dust will be generated on the film body. These particulate dusts are mixed in the air. If they are directly discharged, they will pollute the external environment. In order to reduce the pollution of the waste gas generated in the production process of the protective film to the external environment, a filtering device is usually used to purify the waste gas generated in the production process of the protective film before discharging it. In the related technology, such as Chinese patent CN220360905U, an exhaust gas filtering device is disclosed. When the exhaust gas filtering device is in use, the exhaust gas enters the interior of the filter tank through the air inlet, and the dust particles in the exhaust gas are filtered through the filter cartridge, and the rotating rod inside the filter cartridge is driven to rotate by a driving mechanism. During the rotation of the rotating rod, the brush rod at one end of the fixed rod is used to clean the inner wall of the filter cartridge to prevent it from blocking and affecting the normal filtration of the filter cartridge, and the filter cartridge is vibrated and impacted by a vibration mechanism to shake off the dust particles adhering to the inner wall of the filter cartridge.

[0004] Although the above-mentioned exhaust gas filtering device can purify the exhaust gas to a certain extent, it is found in actual use that with the long-term use of the filter cartridge, the cleaning effect of the brush rod and the vibration mechanism on the filter cartridge will become worse and worse, resulting in the filtering effect of the filter cartridge becoming worse and worse, thereby affecting the production efficiency of the protective film. Summary of the invention

[0005] Based on this, it is necessary to provide a waste gas filtration device for protective film production to address the problem of poor filtration continuity in the current waste gas treatment process for protective film production.

[0006] The above purpose is achieved through the following technical solutions: A waste gas filter device for protective film production, the waste gas filter device for protective film production comprises a vertically placed filter cartridge and a winding mechanism, an unwinding mechanism, a switching mechanism, and a filter membrane all inserted into the filter cartridge, the filter membrane being arranged as a flexible tubular structure, and the winding end is wound on the winding mechanism, and the unwinding end is wound on the unwinding mechanism, the winding mechanism is used for winding the filter membrane, and the unwinding mechanism is used for unwinding the filter membrane; the filter membrane between the winding mechanism and the switching mechanism forms a conical shape, the filter membrane being arranged to have a first state and a second state, when in the first state, the small end of the conical shape of the filter membrane is arranged downward, and when in the second state, the small end of the conical shape of the filter membrane is arranged upward; the switching mechanism is arranged to be able to switch the state of the filter membrane.

[0007] Furthermore, the winding mechanism includes a winding elastic ring and a rotating assembly, the axis of the winding elastic ring is arranged in the vertical direction and can rotate around its own center line, and the winding end of the filter membrane is coaxially wrapped around the winding elastic ring; the rotating assembly is configured to provide a driving force for the winding elastic to rotate around its own center line.

[0008] Furthermore, the cross-sectional shape of the winding elastic ring is set to be an ellipse.

[0009] Furthermore, the winding ring elastically includes two arc-shaped strips; there are two rotating components, which are symmetrically arranged, and the rotating component includes a first driving member, two first gears and two second gears. The teeth on the first gear are partial teeth, and have two sections, and are symmetrically arranged. The two first gears are arranged at intervals, and the ends of the two arc-shaped strips that are close to each other are respectively fixed on the two end faces of the two first gears located on the outside; the first gear and the second gear are meshed with each other and can rotate on their own, and the first driving member is configured to provide a driving force for the second gear to rotate on its own.

[0010] Furthermore, the winding mechanism also includes a push ring, which is coaxially arranged with the winding elastic ring and is configured to be able to lift the filter membrane in the circumferential direction so that the filter membrane between the push ring and the winding elastic ring forms a debris collection area, and the debris collection area is used to collect solid impurities when the filter membrane is in the second state.

[0011] Furthermore, the push ring is configured to be able to slide in a vertical direction so that the debris collection area can always be formed.

[0012] Furthermore, the winding mechanism also includes a second driving member, and the second driving member is configured to provide a driving force for the push ring to slide in a vertical direction.

[0013] Further, the switching mechanism includes a closing ring and a third driving member, the closing ring is sleeved on the filter membrane and can clamp the filter membrane, the closing ring can slide in the vertical direction, and has a corresponding first position and second position before and after sliding, when in the first position, the closing ring is located between the winding mechanism and the unwinding mechanism, and the filter membrane is in the first state, and when in the second position, the closing ring is located above the winding mechanism, and the filter membrane is in the second state; the third driving member is configured to provide a driving force for the closing ring to slide in the vertical direction.

[0014] Furthermore, the winding mechanism comprises an unwinding wheel, which is capable of self-rotation, and the unwinding end of the filter membrane is wound around the unwinding wheel.

[0015] Furthermore, the winding mechanism further comprises a direction-changing frame, which is disposed below the conical shape and is used for changing the direction of the filter membrane released from the unwinding wheel to extend in a vertical direction.

[0016] The beneficial effects of the present invention are: When in use, a waste gas filter device produced by a protective membrane provided by the present invention first adjusts the filter membrane to a first state through a switching mechanism, and then introduces waste gas into the interior of the filter cartridge. After the waste gas is filtered by the filter membrane, solid impurities in the waste gas fall onto the filter membrane. After filtering for a period of time, the filter membrane that has filtered the waste gas is rolled up by a rolling mechanism. During the rolling-up process of the filter membrane, the filter membrane vibrates as it is rolled up, thereby not only shaking off the solid impurities on the filter membrane to the small end of the cone shape, but also replacing the new filter membrane. While achieving self-cleaning of the filter membrane, it is ensured that the filter membrane always has a good filtering effect. Then, the filter membrane is adjusted to a second state through the switching mechanism, so that the solid impurities accumulated at the small end of the cone shape can move along the outer cone surface of the cone shape, thereby preventing impurities from being accumulated on the filter membrane all the time and affecting the filtering effect of the filter membrane.

[0017] Furthermore, by setting the cross-sectional shape of the winding elastic ring to be an ellipse, when the winding elastic ring switches from a horizontal state to a vertical state during the rotation of the winding elastic ring, the winding elastic ring has the effect of accelerating the switching under the action of its own elasticity, thereby increasing the vibration intensity of the filter membrane, improving the effect of shedding solid impurities on the filter membrane, and further ensuring the filtering effect of the filter membrane.

[0018] Furthermore, by setting the winding mechanism also including a pushing ring, when in use, the filter membrane can be lifted up in the circumferential direction under the pushing of the pushing ring, so that the filter membrane between the pushing ring and the winding elastic ring forms a debris collection area, and then when the filter membrane is in the second state, the solid impurities accumulated at the small end of the cone shape can move along the cone shape into the debris collection area, and then when the winding mechanism winds up the filter membrane, the solid impurities located in the debris collection area can be rolled up, thereby preventing the solid impurities from being driven by the exhaust gas to float onto the filter membrane again, affecting the filtering effect of the filter membrane. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the three-dimensional structure of an exhaust gas filtering device produced by a protective film according to an embodiment of the present invention; Figure 2 A schematic front view of the structure of an exhaust gas filter device produced by a protective film according to an embodiment of the present invention; Figure 3 for Figure 2 Middle AA section view; Figure 4 for Figure 3 A schematic diagram of the partially enlarged structure at B in the middle; Figure 5 A schematic diagram of a three-dimensional cross-sectional structure of an exhaust gas filter device produced by a protective film according to an embodiment of the present invention; Figure 6 for Figure 5 A schematic diagram of the partially enlarged structure at C in the middle; Figure 7 A schematic cross-sectional structural diagram of a filter membrane of an exhaust gas filter device produced by a protective membrane according to an embodiment of the present invention when the filter membrane is in a first state; Figure 8 for Figure 7 The schematic diagram of the local enlarged structure at D in the middle; Fig. 9 A schematic cross-sectional structural diagram of a filter membrane of an exhaust gas filter device produced by a protective membrane according to an embodiment of the present invention when the filter membrane is in a second state; Fig.10 for Fig. 9 Schematic diagram of the local enlarged structure at point E in the middle.

[0020] in: 1. Filter cartridge; 101. Air inlet; 102. Air outlet; 11. Leg; 12. Support ring; 121. Support platform; 122. Mounting shell; 13. Support frame; 14. Cutting knife; 2. Filter membrane; 201. Collection area; 3. Winding mechanism; 31. Winding elastic ring; 311. Arc strip; 32. Rotating assembly; 321. First gear; 322. Second gear; 323. Driving motor; 33. Pushing ring; 331. Pushing part; 4. Switching mechanism; 41. Clamping ring; 42. Second driving cylinder; 5. Unwinding mechanism; 51. Unwinding wheel; 52. Direction changing frame. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned herein, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0023] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0024] like Figures 1 to 10As shown, the waste gas filtering device for protective film production provided by an embodiment of the present invention is used for filtering the waste gas generated in the process of protective film production, and is configured to include a vertical filter cartridge 1 and a winding mechanism 3, an unwinding mechanism 5, a switching mechanism 4, and a filter membrane 2, all of which are inserted into the filter cartridge 1. The filter membrane 2 is configured as a flexible tubular structure, and the winding end is wound on the winding mechanism 3, and the unwinding end is wound on the unwinding mechanism 5. The winding mechanism 3 is used to wind up the filter membrane 2, and the unwinding mechanism 5 is used to unwind the filter membrane 2; the filter membrane 2 between the winding mechanism 3 and the switching mechanism 4 forms a conical shape, and the filter membrane 2 is configured to have a first state and a second state. When in the first state, the small end of the conical shape of the filter membrane 2 is set downward, and when in the second state, the small end of the conical shape of the filter membrane 2 is set upward; the switching mechanism 4 is configured to be able to switch the state of the filter membrane 2.

[0025] Specifically in this embodiment, Figure 1 As shown, the filter cartridge 1 is configured as a cylindrical structure and is vertically arranged when in use. An air inlet 101 is provided at the top of the filter cartridge 1, and the air inlet 101 is used to receive the waste gas generated during the production process of the protective film. An air outlet 102 is provided on the circumferential side wall of the bottom of the filter cartridge 1, and the air outlet 102 is used to discharge the filtered waste gas; Figure 7 As shown, when the filter membrane 2 is in the first state, the filter membrane 2 between the winding mechanism 3 and the switching mechanism 4 is an inverted pyramid structure, with the large end at the top and the small end at the bottom; Fig. 9 As shown, when the filter membrane 2 is in the second state, the filter membrane 2 between the winding mechanism 3 and the switching mechanism 4 is configured as a pyramidal structure, with the small end at the top and the large end at the bottom.

[0026] More specifically, in order to facilitate supporting the filter cartridge 1 , a plurality of legs 11 are provided at the bottom of the filter cartridge 1 , and the legs 11 are in contact with the ground when in use.

[0027] Exemplarily, the number of the legs 11 may be four and evenly arranged along the circumferential direction.

[0028] Initially, the filter membrane 2 is in the first state.

[0029] First, the exhaust gas generated during the production of the protective film is introduced into the filter cartridge 1 through the air inlet 101. After the exhaust gas is filtered by the filter membrane 2, the solid impurities in the exhaust gas fall onto the filter membrane 2, and the gas is discharged through the air outlet 102. After filtering for a period of time, the filter membrane 2 that has filtered the exhaust gas is rolled up by the winding mechanism 3. During the rolling process of the filter membrane 2, the filter membrane 2 vibrates as it is rolled up, so that the solid impurities on the filter membrane 2 can be shaken off to the small end of the cone shape, and a new filter membrane 2 can be replaced. While achieving self-cleaning of the filter membrane 2, it is ensured that the filter membrane 2 always has a good filtering effect. Then, the filter membrane 2 is adjusted to the second state through the switching mechanism 4, so that the solid impurities accumulated at the small end of the cone shape can move along the outer cone surface of the cone shape, thereby preventing impurities from being accumulated on the filter membrane 2 and affecting the filtering effect of the filter membrane 2.

[0030] In some embodiments, the winding mechanism 3 is configured to include a winding elastic ring 31 and a rotating component 32. The axis of the winding elastic ring 31 is arranged in the vertical direction and can rotate around its own center line. The winding end of the filter membrane 2 is coaxially wrapped on the winding elastic ring 31; the rotating component 32 is configured to provide a driving force for the winding elastic ring 31 to rotate around its own center line.

[0031] Specifically in this embodiment, Figure 8 and Fig.10 As shown, the winding elastic ring 31 is arranged at the large end of the conical shape and is coaxially arranged with the filter cartridge 1 .

[0032] When the filter membrane 2 is rolled up, the rotating assembly 32 drives the rolling elastic ring 31 to rotate counterclockwise around its own center line. During the process of the rolling elastic ring 31 rotating counterclockwise around its own center line, the rolling elastic ring 31 synchronously drives the filter membrane 2 to be rolled up on the rolling elastic ring 31.

[0033] In a further embodiment, Figure 4 As shown, the cross-sectional shape of the winding elastic ring 31 is set to be an ellipse.

[0034] During the rotation of the winding elastic ring 31, when the winding elastic ring 31 switches from a horizontal state (horizontally placed ellipse) to a vertical state (vertically placed ellipse), the winding elastic ring 31 has the effect of accelerating the switching under the action of its own elasticity, thereby increasing the vibration intensity of the filter membrane 2, increasing the effect of shedding solid impurities on the filter membrane 2, and further ensuring the filtering effect of the filter membrane 2.

[0035] In a further embodiment, the winding ring is elastically configured to include two arcuate bars 311; there are two rotating components 32, which are symmetrically arranged. The rotating component 32 is configured to include a first driving member, two first gears 321 and two second gears 322. The teeth on the first gear 321 are partial teeth, and have two sections, and are symmetrically arranged. The two first gears 321 are arranged at intervals, and the ends of the two arcuate bars 311 that are close to each other are respectively fixed on the two end faces of the two first gears 321 located on the outside; the first gear 321 and the second gear 322 are meshed with each other and can both rotate, and the first driving member is configured to provide a driving force for the second gear 322 to rotate.

[0036] Specifically in this embodiment, Figure 3 and Figure 4 As shown, in order to facilitate the installation of the rotating component 32, a support ring 12 is coaxially and fixedly arranged on the inner circumferential wall of the filter cartridge 1, and the support ring 12 is located below the winding elastic ring 31. Two support platforms 121 are symmetrically arranged on the top of the support ring 12, and the support platform 121 is arranged as an inverted T-shaped structure. The two first gears 321 of the same rotating component 32 are coaxially and rotatably arranged at one end of the support platform 121 suspended during installation; the first driving member is arranged as a driving motor 323, and the driving motor 323 is arranged on the top of the support ring 12 during installation, and is arranged corresponding to the support platform 121, and is located on the outside of the support platform 121 on the same side. The two second gears 322 of the same rotating component 32 are coaxially and fixedly sleeved on the motor shaft of the driving motor 323 during installation, and the two second gears 322 of the same rotating component 32 are respectively meshed with the two first gears 321.

[0037] The angle occupied by the same section of teeth on the first gear 321 is set to be greater than 90 degrees, so that when the second gear 322 is meshed with the end of the same section of teeth on the first gear 321, the end of the arc strip 311 can be slightly rotated downward by a certain angle compared to the horizontal ellipse, thereby ensuring that the arc strip 311 can smoothly switch from a horizontal state to a vertical state under the action of its own elasticity; when the arc strip 311 is installed, the ellipse center of the end of the arc strip 311 is arranged to coincide with the axis of the first gear 321, so that when the first gear 321 rotates, it can synchronously drive both ends of the arc strip 311 to rotate around their respective ellipse centers.

[0038] More specifically, to prevent the filter membrane 2 from being wound around the outside of the rotating assembly 32, as shown in FIG. Figure 6 As shown, a cutting knife 14 is fixedly arranged on the top of each supporting platform 121 , and the cutting knife 14 is extended along the radial direction of the filter cartridge 1 .

[0039] When in use, the two driving motors 323 are started, wherein the driving motor 323 on the left side drives the second gear 322 on the left side to rotate in the counterclockwise direction, and the second gear 322 on the left side drives the first gear 321 on the same side to rotate in the clockwise direction through gear meshing, and the first gear 321 drives the left ends of the two arc-shaped strips 311 to rotate synchronously around their own center lines in the clockwise direction; the driving motor 323 on the right side drives the second gear 322 on the left side to rotate in the clockwise direction, and the second gear 322 on the left side drives the first gear 321 on the same side to rotate in the counterclockwise direction through gear meshing, and the first gear 321 drives the right ends of the two arc-shaped strips 311 to rotate synchronously around their own center lines in the counterclockwise direction, so that the winding elastic ring 31 rotates around its own center line as a whole, and then drives the large end of the filter membrane 2 to be continuously wound on the winding elastic ring 31; in the process of winding the filter membrane 2, when the filter membrane 2 passes through the cutting knife 14, the filter membrane 2 is divided into two, so that it can be wound on the two arc-shaped strips 311 respectively.

[0040] In other embodiments, in order to facilitate the unified treatment of solid impurities accumulated at the small end of the conical shape when the filter membrane 2 is in the second state, the winding mechanism 3 is configured to also include a push ring 33, and the push ring 33 and the winding elastic ring 31 are coaxially arranged and configured to be able to lift the filter membrane 2 along the circumferential direction, so that the filter membrane 2 between the push ring 33 and the winding elastic ring 31 forms a collection area 201, and the collection area 201 is used to collect solid impurities when the filter membrane 2 is in the second state.

[0041] Specifically in this embodiment, Figure 4 As shown, the push ring 33 is coaxially arranged with the filter cartridge 1 and is located above the support ring 12; to facilitate the installation of the push ring 33, an annular mounting shell 122 is fixed and coaxially arranged on the top of the support ring 12, and the bottom end of the push ring 33 is slidably inserted into the mounting shell 122 during installation, and the top end is suspended and pushed on the bottom of the filter membrane 2; Fig.10 As shown, the impurity collecting area 201 is configured as an annular structure, and the cross-sectional shape is configured as a V-shape, with the opening facing upward.

[0042] More specifically, in order to prevent the filter membrane 2 from being scratched by the top edge of the push ring 33 when the filter membrane 2 is rolled up, Figure 4 As shown, an annular pushing portion 331 is coaxially and fixedly arranged on the top of the pushing ring 33 , and the cross-sectional shape of the pushing portion 331 is set to be circular, so that the filter membrane 2 can achieve a smooth transition through the pushing portion 331 when passing through the pushing ring 33 .

[0043] When the filter membrane 2 is in the second state, the solid impurities accumulated at the small end of the cone shape can move downward along the outer cone surface of the cone shape into the impurity collection area 201, and then when the filter membrane 2 is rolled up, the solid impurities located in the impurity collection area 201 can be rolled up, thereby preventing the solid impurities from being driven by the exhaust gas to float onto the filter membrane 2 again, affecting the filtering effect of the filter membrane 2.

[0044] In a further embodiment, as the number of turns of the filter membrane 2 wound on the winding elastic ring 31 increases, the distance between the outermost filter membrane 2 and the push ring 33 becomes shorter, so that the impurity collection area 201 becomes smaller, thereby affecting the collection effect of solid impurities; to solve this problem, the push ring 33 is configured to be able to slide in the vertical direction so that the impurity collection area 201 can always be formed.

[0045] When in use, by driving the push ring 33 to slide upward in the vertical direction, the push portion 331 is always located above the outermost filter membrane 2 wrapped on the winding elastic ring 31, so that the impurity collecting area 201 can be always formed and the impurity collecting area 201 has a larger volume, thereby ensuring the impurity storage capacity of the impurity collecting area 201.

[0046] In a further embodiment, the winding mechanism 3 is configured to further include a second driving member, and the second driving member is configured to provide a driving force for the push ring 33 to slide in the vertical direction.

[0047] Specifically in this embodiment, the second driving member can be set as a first driving cylinder. The first driving cylinder is inserted into the mounting shell 122 during installation, and the bottom end is fixed to the top of the support ring 12. The output shaft is arranged upward in the vertical direction and fixedly connected to the bottom of the push ring 33 to synchronously drive the push ring 33 to slide in the vertical direction.

[0048] More specifically, in order to make the push ring 33 evenly stressed, a plurality of first drive cylinders may be provided and arranged at equal intervals along the circumferential direction.

[0049] It can be understood that the first driving cylinder can be configured as any one of a hydraulic cylinder, a pneumatic cylinder or an electric cylinder.

[0050] During use, the first drive cylinder is started, and when the output shaft of the first drive cylinder is extended, the push ring 33 is synchronously driven to move upward in the vertical direction; when the output shaft of the first drive cylinder is retracted, the push ring 33 is synchronously driven to move downward in the vertical direction.

[0051] In other embodiments, the switching mechanism 4 is configured to include a closing ring 41 and a third driving member. The closing ring 41 is sleeved on the filter membrane 2 and can clamp the filter membrane 2. The closing ring 41 can slide in the vertical direction and has a corresponding first position and a second position before and after sliding. When in the first position, the closing ring 41 is located between the winding mechanism 3 and the unwinding mechanism 5, and the filter membrane 2 is in the first state. When in the second position, the closing ring 41 is located above the winding mechanism 3, and the filter membrane 2 is in the second state. The third driving member is configured to provide a driving force for the closing ring 41 to slide in the vertical direction.

[0052] Specifically in this embodiment, the constriction ring 41 is set as an annular structure and is coaxially arranged with the filter cartridge 1; Figure 7 As shown, at this time, the closing ring 41 is in the first position, the filter membrane 2 is in the first state, and the closing ring 41 is located between the winding mechanism 3 and the unwinding mechanism 5; Fig. 9 As shown, at this time, the closing ring 41 is in the second position, the filter membrane 2 is in the second state, and the closing ring 41 is located above the winding mechanism 3; the third driving member can be set as a second driving cylinder 42, and the second driving cylinder 42 is fixedly set at the bottom of the filter cylinder 1 during installation, and the output end is fixedly set at the bottom of the closing ring 41.

[0053] More specifically, in order to achieve the clamping effect of the clamping ring 41 on the filter membrane 2, a plurality of arc-shaped clips (not shown) can be evenly distributed on the inner wall of the clamping ring 41. All the clips together form an annular structure. Each clip is connected to the clamping ring 41 through a compression spring. Under the action of the compression spring, the clip has a tendency to extend, thereby being able to clamp the filter membrane 2.

[0054] More specifically, in order to make the tightening ring 41 evenly stressed, the number of the second driving cylinders 42 can be three, and the three second driving cylinders 42 are evenly arranged along the circumferential direction.

[0055] It can be understood that the second driving cylinder 42 can be configured as any one of a hydraulic cylinder, a pneumatic cylinder or an electric cylinder.

[0056] During use, when the filter membrane 2 needs to switch from the first state to the second state, the second drive cylinder 42 is started, the output shaft of the second drive cylinder 42 is extended, and the closing ring 41 is synchronously driven to move from the first position to the second position; when the filter membrane 2 needs to switch from the second state to the first state, the second drive cylinder 42 is started, the output shaft of the second drive cylinder 42 is retracted, and the closing ring 41 is synchronously driven to move from the second position to the first position.

[0057] In other embodiments, the winding mechanism 3 is configured to include an unwinding wheel 51 , which is capable of self-rotation, and the unwinding end of the filter membrane 2 is wound around the unwinding wheel 51 .

[0058] Specifically in this embodiment, Figure 5 As shown, the unwinding wheel 51 is arranged as a rotating body structure in the shape of "╪", and is horizontally arranged during installation; to facilitate the installation of the unwinding wheel 51, a support frame 13 is fixedly arranged at the bottom of the filter cylinder 1. The support frame 13 is arranged as a U-shaped structure with an upward opening. The number of the support frames 13 is two and they are arranged at intervals. The two suspended end parts of the unwinding wheel 51 during installation can be rotatably inserted into the openings of the two support frames 13 respectively.

[0059] In a further embodiment, the winding mechanism 3 is further arranged to include a deflecting frame 52. The deflecting frame 52 is arranged below the conical shape and is used to deflect the filter membrane 2 released from the unwinding wheel 51 to extend in the vertical direction.

[0060] Specifically in this embodiment, as Figure 5 shown, the deflecting frame 52 is arranged as a "匚" - shaped structure with a downward opening.

[0061] During the use process, the filter membrane 2 released from the unwinding wheel 51 is first pulled horizontally to the bottom of the deflecting frame 52, and then bypasses the cross - bar part of the deflecting frame 52 and is deflected to the vertical state and passes through the converging ring 41, so that there is no angular change in the filter membrane 2 before and after passing through the converging ring 41, thereby reducing the wear of the filter membrane 2.

[0062] Combined with the above - mentioned embodiments, the working principle and process of the embodiments of the present invention are as follows: Initially, the filter membrane 2 is in the first state.

[0063] First, waste gas generated during the production of the protective film is introduced into the filter cylinder 1 through the air inlet 101. After being filtered by the filter membrane 2, the solid impurities in it fall onto the filter membrane 2, and the gas is discharged through the air outlet 102.

[0064] After filtering for a period of time, two driving motors 323 are started. The left - hand driving motor 323 drives the left - hand second gear 322 to rotate counter - clockwise around its own center line. The left - hand second gear 322 drives the first gear 321 on the same side to rotate clockwise through gear meshing. The first gear 321 drives the left ends of the two arc - shaped strips 311 to rotate synchronously around their own center lines in the clockwise direction; the right - hand driving motor 323 drives the left - hand second gear 322 to rotate clockwise around its own center line. The left - hand second gear 322 drives the first gear 321 on the same side to rotate counter - clockwise through gear meshing. The first gear 321 drives the right ends of the two arc - shaped strips 311 to rotate synchronously around their own center lines in the counter - clockwise direction, so that the winding elastic ring 31 as a whole rotates around its own center line, and then drives the large end of the filter membrane 2 to be continuously wound on the winding elastic ring 31; during the winding process of the filter membrane 2, when the filter membrane 2 passes through the cutting knife 14, the filter membrane 2 is divided into two, so that it can be wound on the two arc - shaped strips 311 respectively.

[0065] During the rolling process of the filter membrane 2 , the filter membrane 2 vibrates as it is rolled up, so that solid impurities on the filter membrane 2 can be shaken off to the small end of the cone shape, and a new filter membrane 2 can be replaced.

[0066] At the same time, the first driving cylinder is started, and the output shaft of the first driving cylinder extends to synchronously drive the pushing ring 33 to move upward in the vertical direction, so that the pushing portion 331 is always located above the outermost filter membrane 2 wound on the winding elastic ring 31.

[0067] Then the second driving cylinder 42 is started, and the output shaft of the second driving cylinder 42 is extended, synchronously driving the tightening ring 41 to move from the first position to the second position, so that the filter membrane 2 switches from the first state to the second state, so that the solid impurities accumulated at the small end of the cone shape can move downward along the outer cone surface of the cone shape to the impurity collection area 201, and then when the filter membrane 2 is rolled up, the solid impurities located in the impurity collection area 201 can be rolled up.

[0068] Then, the second driving cylinder 42 is started, and the output shaft of the second driving cylinder 42 is retracted, which synchronously drives the converging ring 41 to move from the second position to the first position, so that the filter membrane 2 is switched from the second state to the first state.

[0069] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A waste gas filtration device for protective film production, characterized in that: The waste gas filtering device produced by the protective film includes a vertically placed filter cartridge and a winding mechanism, an unwinding mechanism, a switching mechanism, and a filter membrane all of which are inserted into the filter cartridge. The filter membrane is arranged as a flexible tubular structure, and the winding end is wound on the winding mechanism, and the unwinding end is wound on the unwinding mechanism. The winding mechanism is used to wind up the filter membrane, and the unwinding mechanism is used to unwind the filter membrane. The filter membrane between the winding mechanism and the switching mechanism forms a conical shape, and the filter membrane is arranged to have a first state and a second state. When in the first state, the small end of the conical shape of the filter membrane is arranged downward, and when in the second state, the small end of the conical shape of the filter membrane is arranged upward. The switching mechanism is arranged to be able to switch the state of the filter membrane.

2. The waste gas filtering device for protective film production according to claim 1 is characterized in that: The winding mechanism includes a winding elastic ring and a rotating component. The axis of the winding elastic ring is arranged in the vertical direction and can rotate around its own center line. The winding end of the filter membrane is coaxially wrapped on the winding elastic ring; the rotating component is configured to provide a driving force for the winding elastic to rotate around its own center line.

3. The waste gas filtering device for protective film production according to claim 2 is characterized in that: The cross-sectional shape of the winding elastic ring is set to be an ellipse.

4. The waste gas filtering device for protective film production according to claim 3 is characterized in that: The winding ring elasticity includes two arcuate strips; there are two rotating components, which are symmetrically arranged, and the rotating component includes a first driving member, two first gears and two second gears. The teeth on the first gear are partial teeth, and have two sections, and are symmetrically arranged. The two first gears are arranged at intervals, and the ends of the two arcuate strips close to each other are respectively fixed on the two end faces of the two first gears located on the outside; the first gear and the second gear are meshed with each other and can rotate on their own, and the first driving member is configured to provide a driving force for the second gear to rotate on its own.

5. The waste gas filtering device for protective film production according to claim 2, characterized in that: The winding mechanism also includes a push ring, which is coaxially arranged with the winding elastic ring and configured to lift the filter membrane in a circumferential direction so that a debris collection area is formed on the filter membrane between the push ring and the winding elastic ring, and the debris collection area is used to collect solid impurities when the filter membrane is in the second state.

6. The waste gas filtering device for protective film production according to claim 5, characterized in that: The push ring is configured to be able to slide in a vertical direction so that the debris collection area can always be formed.

7. The waste gas filtering device for protective film production according to claim 6, characterized in that: The winding mechanism further comprises a second driving member, wherein the second driving member is configured to provide a driving force for the push ring to slide in a vertical direction.

8. The waste gas filtering device for protective film production according to claim 1, characterized in that: The switching mechanism includes a closing ring and a third driving member. The closing ring is sleeved on the filter membrane and can clamp the filter membrane. The closing ring can slide in the vertical direction and has a corresponding first position and second position before and after sliding. When in the first position, the closing ring is located between the winding mechanism and the unwinding mechanism, and the filter membrane is in the first state. When in the second position, the closing ring is located above the winding mechanism, and the filter membrane is in the second state. The third driving member is configured to provide a driving force for the closing ring to slide in the vertical direction.

9. The waste gas filtering device for protective film production according to claim 1, characterized in that: The winding mechanism comprises an unwinding wheel, which is capable of self-rotation, and the unwinding end of the filter membrane is wound around the unwinding wheel.

10. The waste gas filtering device for protective film production according to claim 9, characterized in that: The winding mechanism further comprises a direction-changing frame, which is arranged below the conical shape and is used for changing the direction of the filter membrane released from the unwinding wheel to extend in a vertical direction.

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