Dustproof valve for ventilating duct

Abstract

The dustproof valve comprises a valve device, a shutter protecting cover is connected to the front portion of the valve device, a rear connecting dust collecting frame is connected to the rear portion of the valve device, a valve shell is arranged in the valve device, a driving device is installed on the outer wall of the valve shell, even number of valve inner guide blocks are installed in the valve shell, and valve bodies are arranged between the even number of valve inner guide blocks. When the valve body is opened, the valve body is driven by the driving device, so that the valve body is reset to a 90-degree horizontal ventilation state after being opened and closed by 135 degrees, a sliding frame connected with an ejector rod is jacked by a lower top sealing plate on a side sliding rail by the same degree and then is reset synchronously, a dust screen in a dust screen winding drum is stretched in the jacking and resetting process, and the dust screen is prevented from being blocked. According to the dust-proof net, the net body is matched with the cleaning assembly to form brushing, dust adhering to the surface of the net body falls into the collecting box to be collected under brushing, then dust cleaning work on the dust-proof net is completed under the condition that the dust-proof net is not disassembled, and the normal operation state of the air volume and the ventilation system in the long-time use state is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of valve bodies, in particular to a dust-proof valve for a ventilation duct. Background Art

[0002] Ventilation duct valves are key components of ventilation systems, primarily used to regulate air flow. Their core functions include adjusting air volume, either by opening or closing them to match ventilation requirements; controlling airflow direction, with some valves directing air along a predetermined path; and blocking or opening ventilation paths. For example, closing them can isolate areas of abnormal airflow, preventing the spread of odors and contaminants and ensuring efficient and stable system operation.

[0003] However, the existing technology has the following deficiencies: the dustproof of the existing ventilation duct valve is generally installed and fixed with the inside of the valve body in the form of a dustproof plug-in plate, so that after a certain period of use, the valve needs to be disassembled, and the dustproof plate or dustproof mesh frame therein needs to be removed for cleaning and then reinstalled. The dustproof plate that has not been cleaned for a long time is more likely to stick to dust and other foreign matter due to the dust on the surface, and the mesh holes will be blocked, resulting in a decrease in ventilation volume. In addition, the valve body needs to be stopped during the dismantling process, affecting the normal operation of the ventilation system. Summary of the Invention

[0004] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the structures particularly pointed out in the description and other drawings.

[0005] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a dust-proof valve for a ventilation duct. Each time the valve device is opened, the dust-proof net on the dust-proof net drum in the dust collecting frame is triggered by the built-in valve body to clean the dust-proof net, so that each time the valve body is opened, dust can be effectively prevented from sticking and accumulating on the dust-proof net, and the dust cleaning work on the dust-proof net can be completed without disassembly, thereby ensuring the normal operation of the air volume and ventilation system.

[0006] In order to achieve the above-mentioned purpose, the present invention is realized through the following technical scheme: a ventilation duct dust-proof valve, comprising a valve device, the front of the valve device is connected to a shutter cover, the rear of the valve device is connected to a rear dust collecting frame, a valve housing is provided in the valve device, a driving device is installed on the outer wall of the valve housing, an even number of valve guide blocks are installed in the valve housing, a valve body is provided between the even number of valve guide blocks, an even number of valve body sealing side blocks are provided in front and behind the valve body; a frame is provided in the rear dust collecting frame, and the lower part of the frame A collecting box is installed on the side, a dustproof net roll is fixed on the inner surface of the upper part of the frame, an even number of auxiliary net rails are connected to the bottom of the dustproof net roll, a guide roll is provided at the end of the auxiliary net rail, a cleaning assembly is provided behind the guide roll, and a through groove is provided between the guide roll and the cleaning assembly; a grooved guide block body is provided in the guide block in the valve, and an arc-shaped guide rail is connected to the end of the guide block in the valve, one of the arc-shaped guide rails is installed with a connected top rod, a slide is fixed on the top of the arc-shaped guide rail, and side slide rails are provided at both ends of the slide.

[0007] The present invention is further improved in that the dustproof net roll has a built-in dustproof net, and both ends of the dustproof net are hollow. The dustproof net in the dustproof net roll passes through the auxiliary net rail and the guide roll in sequence and is fixed on the slide. The slide is driven to move by the associated push rod, and the associated push rod is driven by the valve body. Both ends of the slide are slidably matched with the side slide rail, and the arc guide rail is used for limiting and sliding cooperation of the arc guide rail, and the cleaning component cooperates with the dustproof net on the dustproof net roll.

[0008] The present invention is further improved in that a drive shaft is provided in the valve body, an even number of valve discs are installed on the drive shaft, a plurality of embedded spring cylinders are installed on the valve disc, a lower top sealing plate is nested in the valve disc, and an upper disc adapter plate is installed on one surface of the valve disc.

[0009] The present invention is further improved in that the adapter plate on the petal is adapted to the valve body sealing side block, the lower top sealing plate is nested in the lower top sealing plate and is fixed by the embedded spring tube, the protrusion of the lower top sealing plate is fixed to the associated push rod, the drive shaft cooperates with the drive device, and the lower top sealing plate is engaged with the grooved guide block body and the arc guide rail.

[0010] The present invention is further improved in that an inclined guide block is provided in the cleaning component, an even number of fixing frames are fixed on the surface of the inclined guide block, a connecting rod rotating frame is installed on the inner wall of the fixing frame, an even number of nested rods are connected to the connecting rod rotating frame, elastic stretching rods are installed between the even number of nested rods, and an in-groove slide rail is opened in the through groove.

[0011] The present invention is further improved in that the inclined guide block is used to guide the dust on the dustproof net roll, and the cleaning brush and the cleaning brush can be installed on the nesting rod respectively. The lower part of the nesting rod is opposite to the through groove, and the lower part of the through groove is opposite to the through groove, and the through groove is engaged with the frame.

[0012] The present invention is further improved in that top frames are installed on both sides of the outer wall of the valve housing, a connecting rod cylinder is fixed on the outer wall of the top frame, a tension rod is connected to the connecting rod cylinder and the upper surface of the valve housing, and the driving device is arranged on the inner side of the top frame.

[0013] As a further improvement to the present invention, a driving wheel is provided in the driving device, a driven wheel is provided below the driving wheel, and a transmission belt is connected between the driven wheel and the driving wheel.

[0014] In a further improvement to the present invention, the driven wheel is connected to the valve body, the driving device is composed of a motor and a controller, and the connecting rod cylinder and the valve housing are both hoisted by the tension rod.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, when the valve body is opened, the driving device drives the valve body, so that the valve body opens and closes 135 degrees and then resets to a horizontal ventilation state of 90 degrees, so that the lower top sealing plate lifts the slide connected to the push rod on the side slide rail by the same degree and then resets synchronously. During the lifting and resetting process, the dust net in the dust net reel is stretched, so that the net body cooperates with the cleaning component to form a brush, and the dust sticking to the surface of the net body falls off under the brush and is collected in the collection box, thereby completing the dust cleaning work on the dust net without disassembly, ensuring the normal operation of the air volume and ventilation system under long-term use.

[0016] 2. The present invention can always assist in the movement and fixation of the lower top sealing plate through the cooperation of the grooved block and the arc guide rail, so that when it is closed, the grooved block always allows the lower top sealing plate to fit the surface of the grooved block while cooperating with the valve body sealing side blocks on both sides to achieve sealing of the valve body, and the two sides are adapted and fitted by the disc adapter plate on the valve disc to prevent air leakage when the valve is closed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural schematic diagram of a dust-proof valve for a ventilation duct according to the present invention; Figure 2 This is a rear structural schematic diagram of a valve device in a ventilation duct dust prevention valve according to the present invention; Figure 3 This is a schematic diagram of the structure of a dust collecting frame connected to a dust-proof valve for a ventilation duct according to the present invention; Figure 4This is a front view structural diagram of a valve inner guide block in a ventilation duct dust prevention valve according to the present invention; Figure 5 This is a schematic diagram of the rear structure of a valve body in a ventilation duct dust prevention valve of the present invention; Figure 6 This is a schematic diagram of the three-dimensional structure of a through groove in a dust-proof valve for a ventilation duct according to the present invention; Figure 7 This is a schematic diagram of the front structure of a valve body in a dust-proof valve for a ventilation duct according to the present invention; Figure 8 This is a schematic side sectional view of a dust-proof valve for a ventilation duct according to the present invention; Figure 9 for Figure 8 A partial enlarged schematic diagram of the three-dimensional structure of the middle A; Figure 10 This is a schematic diagram of the inner dust screen of the dust screen reel in a ventilation duct dust screen valve of the present invention.

[0018] Figure: Valve assembly 1, louver cover 2, rear dust collection frame 3, valve housing 11, top frame 12, tension rod 13, drive unit 14, valve guide block 15, connecting rod cylinder 16, valve body 17, valve body sealing side block 18, frame 31, collection box 32, dust screen reel 33, auxiliary mesh rail 34, guide reel 35, cleaning assembly 36, through slot 37, drive wheel 141, transmission belt 142 , driven wheel-143, grooved guide block body-151, arc-shaped guide rail-152, connected top rod-153, slide-154, side slide rail-155, drive shaft-171, valve disc-172, embedded spring cylinder-173, lower top sealing plate-174, inclined guide block-361, fixed frame-362, nested rod-363, elastic stretching rod-364, connecting rod rotating frame-365, groove slide rail-371, adapter plate on the disc-1721. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but are not intended to limit the present invention.

[0020] In addition, in the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 on the present invention.

[0021] In the present invention, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed connections, removable connections, or integration; they may refer to direct connections or indirect connections through an intermediate medium; they may refer to internal communication between two components or interactions between two components. However, the term "direct connection" indicates that the two connected entities are not connected through a transitional structure, but are connected solely through a connecting structure to form a single entity. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0022] In the present invention, unless otherwise clearly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0023] The present invention will be further described below with reference to the accompanying drawings: Example 1

[0024] As attached Figure 1 To the attached Figure 8 As shown: The present embodiment provides a ventilation duct dustproof valve, including a valve device 1, a shutter cover 2 connected to the front of the valve device 1, a rear dust collecting frame 3 connected to the rear of the valve device 1, a valve housing 11 is provided in the valve device 1, a driving device 14 is installed on the outer wall of the valve housing 11, an even-numbered valve inner guide block 15 is installed in the valve housing 11, a valve body 17 is provided between the even-numbered valve inner guide blocks 15, an even-numbered valve body sealing side block 18 is provided in front and behind the valve body 17, a top frame 12 is installed on both sides of the outer wall of the valve housing 11, and a top frame 12 is installed on both sides of the outer wall of the valve housing 11. A connecting rod 16 is fixed to the outer wall of valve housing 12, and a tension rod 13 is connected to both the connecting rod 16 and the upper surface of valve housing 11. A dust collecting frame 3 is connected to the rear dust collecting frame 3, and a collection box 32 is mounted below the frame 31. A dust screen reel 33 is fixed to the inner surface of the upper part of the frame 31. An even number of auxiliary net rails 34 are connected to the lower part of the dust screen reel 33. A guide reel 35 is installed at the end of the auxiliary net rail 34. A cleaning assembly 36 is installed behind the guide reel 35, and a through slot 37 is provided between the guide reel 35 and the cleaning assembly 36. A driving wheel 141 is installed in the driving device 14, and a driven wheel 143 is installed below the driving wheel 141. A transmission belt 142 is connected between the driven wheel 143 and the driving wheel 141. The valve guide block 15 is equipped with a grooved guide block body 151. The distal end of the guide block 15 is connected to an arcuate guide rail 152. A push rod 153 is mounted on one of the arcuate guide rails 152. A slide 154 is fixed to the top of the arcuate guide rail 152. Side rails 155 are installed on both ends of the slide 154. A drive shaft 171 is mounted on the drive shaft 171. An even number of valve discs 172 are mounted on the discs 172. Several embedded spring cylinders 173 are mounted on the discs 172. A lower top sealing plate 174 is nested within the discs 172. An in-slot slide rail 371 is defined within the through-slot 37. An upper disc adapter plate 1721 is mounted on one surface of the discs 172.

[0025] Furthermore, when the driving device 14 is turned on, it is controlled by the motor and the controller to swing from the vertical 0° state to plus or minus 135° and then reset to the 90° state.

[0026] Furthermore, there are at least two grooved guide block bodies 151, which are in an arc-shaped block shape as a whole and have a groove in the middle. The groove is used to cooperate with the protrusion set in the middle of the lower top sealing plate 174 for auxiliary sliding.

[0027] Furthermore, the arc guide rail 152 is connected to the end of the grooved guide block body 151, and is used to assist the protrusion set in the middle of the lower top sealing plate 174 to limit and assist sliding after extending out of the grooved guide block body 151, and the associated push rod 153 is installed between the slots between the arc guide rails 152, and is fixed and slid by the lower top sealing plate 174.

[0028] Furthermore, the slide 154 is mainly installed on the inner wall of the valve housing 11, and is raised together with the push rod 153 when it is fixed by the lower top sealing plate 174, thereby cooperating with the side slide rail 155 to complete the up and down sliding work, and the push rod 153 can complete the corresponding adaptive extension or contraction through its own nested structure when rising.

[0029] Furthermore, there are two sets of arc-shaped guide rails 152 designed, which are installed at opposite angles to each other, similar to the grooved guide block 151 , but the top rods 153 , slides 154 and side slide rails 155 are not installed between the arc-shaped guide rails 152 near the shutter cover 2 .

[0030] Furthermore, there are at least two valve flaps 172, which are installed in opposite directions on the surface of the drive shaft 171, and both surfaces are installed with flap adapter plates 1721, which are used to seal with the valve body sealing side block 18 when the flaps are reset to a vertically closed state.

[0031] Furthermore, a plurality of embedded spring tubes 173 are installed on the surface of the valve disc 172, and the springs in the embedded spring tubes 173 are always pressed against the surface of the lower top sealing plate 174, so that the surface is always pressed against the surface of the grooved guide block 151 for sealing when resetting.

[0032] The specific working principle is as follows: The present invention completes the covering of the valve device 1 by installing the valve device 1 at the specified position, fixing the shutter cover 2 with bolts in the front, and connecting the dust collecting frame 3 in the rear, and finally fixing it to the ventilation duct. The top frame 12 of the side wall of the valve housing 11 is pressed against the inner wall of the wall, and the tension rod 13 is respectively connected to the valve housing and the connecting rod tube 16 to form a suspension. When the driving device 14 is turned on, the driving shaft 171 in the valve body 17 drives the valve disc 172 to rotate from the vertical 0° to 135° and then return to the horizontal state of 90°. During the rotation of the valve disc 172, the lower top sealing plate 174 is displaced in the grooved guide block 151, and the rear is equipped with With the cooperation of the arc guide rail 152, the connecting push rod 153 and the slide 154 are synchronously linked to lift on the side slide rail 155, stretching the dust net inside the dust net roll 33 inside the frame 31, and the cleaning component 36 completes the cleaning of the dust net surface, allowing the dust on the dust net to fall from the through groove 37 and enter the collection box 32 for collection. When use is finished, the valve body 17 is triggered to close by the drive device 14, allowing the lower top sealing plate 174 to retract into the grooved guide block body 151, while the embedded spring cylinder 173 continues to close, allowing its valve disc 172 to be sealed, and the adapter plate 1721 on the disc is engaged with the valve body sealing side block 18, achieving a high sealing effect. Example 2

[0033] As attached Figure 3 , Attachment Figure 6 and attached Figure 9-10As shown: Among them, the rear dust collection frame 3 is provided with a frame body 31, a collection box 32 is installed below the frame body 31, a dust screen reel 33 is fixed to the inner surface of the upper part of the frame body 31, and an even number of auxiliary net rails 34 are connected to the lower part of the dust screen reel 33. A guide reel 35 is provided at the end of the auxiliary net rail 34, and a cleaning assembly 36 is provided behind the guide reel 35. A through slot 37 is provided between the guide reel 35 and the cleaning assembly 36. An inclined guide block 361 is provided in the cleaning assembly 36, and an even number of fixing frames 362 are fixed to the surface of the inclined guide block 361. A connecting rod rotating frame 365 is installed on the inner wall of the fixing frame 362. An even number of nested rods 363 are connected to the connecting rod rotating frame 365. Elastic stretch rods 364 are installed between the even number of nested rods 363. An in-slot slide rail 371 is provided in the through slot 37.

[0034] Furthermore, the collection box 32 is mainly engaged with the frame 31 , and the upper side faces the through slot 37 . With the cooperation of the cleaning assembly 36 , dust can be introduced into the collection box 32 for collection.

[0035] Furthermore, the dustproof net reel 33 has its own dustproof net, the two ends of the dustproof net are hollowed out, the middle section is in a mesh state, and the sides of the dustproof net are wrapped with rubber strips to facilitate movement in the auxiliary net rail 34, the guide reel 35 and the through groove 37.

[0036] Furthermore, the hollowed-out ends of the dust net in the dust net reel 33 are mainly convenient for the dust to fall into the collection box 32 through the hollowed-out areas during reset after the cleaning assembly 36 cleans the dust on the net surface for collection.

[0037] Furthermore, the guide reel 35 is provided with two auxiliary feeding rods, which assist the dust-proof net passing through in changing its position and enable the dust-proof net to move more smoothly and stably when being stretched by tension.

[0038] Furthermore, the inclined guide block 361 is tilted as a whole, fixed to the inner surface of the frame 31 and passing through one side of the slot 37 , and the surface of the inclined guide block 361 is fixed by a fixing frame 362 , which cooperates with the connecting rod rotating frame 365 to complete the installation of the nesting rod 363 .

[0039] Furthermore, an elastic stretching rod 364 is installed between the nesting rods 363. The elastic stretching rod 364 is mainly retracted by being compressed and nested in the nesting rods 363, thereby facilitating the installation and replacement of the cleaning brush and the cleaning brush.

[0040] The specific working principle is as follows: The dustproof net in the dustproof net winding drum 33 is engaged with the auxiliary net track 34 and the guide winding drum 35, and then slides out of the slot in the sliding track 371 in the through slot 37, and the end is fixed on the sliding carriage. When the valve body is triggered, the sliding carriage and the dustproof net are lifted, and the dustproof net is pulled, so that the cleaning brush installed on the connecting rod rotating frame 365 on the surface of the inclined guide block 361 is matched and brushed, and the dustproof net surface is brushed off, and the dust falling off is guided by the inclined guide block 361 and falls into the through slot 37 and enters the collecting box 32 for collection. The other nested rod 363 is matched with the cleaning brush on the nested rod 363, so that the cleaning brush is kept clean and the service life is prolonged. The cleaning brush cleaned falls into the collecting box 32, and when the cleaning brush and the cleaning brush need to be replaced, the elastic stretching rod 364 is removed, the nested rod 363 is separated in the middle, and the two are replaced or cleaned and then used again.

[0041] It should be understood that the disclosed embodiments are not limited to the particular process steps or materials disclosed herein, but extend to equivalents thereof that are apparent to those skilled in the relevant art. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting.

[0042] Reference throughout this specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. Thus, the appearances of the phrase "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.

[0043] Furthermore, the described features or characteristics can be combined in any other suitable manner in one or more embodiments. In the above description, specific details of particular embodiments are provided to provide a thorough understanding of embodiments of the application. However, one skilled in the relevant art will understand that the application can be practiced without one or more of the specific details, or with other methods, components, materials, etc.

Claims

1. A dust-proof valve for a ventilation duct, characterized in that: The invention comprises a valve device (1), wherein the front of the valve device (1) is connected to a shutter cover (2), the rear of the valve device (1) is connected to a rear dust collecting frame (3), a valve housing (11) is provided in the valve device (1), a driving device (14) is installed on the outer wall of the valve housing (11), an even number of valve inner guide blocks (15) are installed in the valve housing (11), a valve body (17) is provided between the even number of valve inner guide blocks (15), and an even number of valve body sealing side blocks (18) are provided in front and behind the valve body (17); The rear dust collecting frame (3) is provided with a frame (31), a collecting box (32) is installed below the frame (31), a dust screen reel (33) is fixed to the inner surface of the upper part of the frame (31), an even number of auxiliary net rails (34) are connected below the dust screen reel (33), a guide reel (35) is provided at the end of the auxiliary net rail (34), a cleaning assembly (36) is provided behind the guide reel (35), and a through slot (37) is provided between the guide reel (35) and the cleaning assembly (36); A grooved guide block body (151) is provided in the valve inner guide block (15), and an arcuate guide rail (152) is connected to the end of the valve inner guide block (15), wherein a connecting push rod (153) is installed on one of the arcuate guide rails (152), and a slide (154) is fixed on the top of the arcuate guide rail (152), and side slide rails (155) are provided at both ends of the slide (154).

2. The dust-proof valve for ventilation duct according to claim 1, characterized in that: The dustproof net reel (33) has a built-in dustproof net, and both ends of the dustproof net are hollowed out. The dustproof net in the dustproof net reel (33) passes through the auxiliary net rail (34) and the guide reel (35) in sequence and is fixed on the slide (154). The slide (154) is driven to move by the associated push rod (153), and the associated push rod (153) is driven by the valve body (17). Both ends of the slide (154) are slidably matched with the side slide rail (155). The arc guide rail (152) is used for limiting and sliding the arc guide rail (152). The cleaning component (36) is matched with the dustproof net on the dustproof net reel (33).

3. The dust-proof valve for ventilation duct according to claim 2, characterized in that: A drive shaft (171) is provided in the valve body (17), an even number of valve discs (172) are mounted on the drive shaft (171), a plurality of embedded spring cylinders (173) are mounted on the valve disc (172), a lower top sealing plate (174) is nested in the valve disc (172), and an upper disc adapter plate (1721) is mounted on one surface of the valve disc (172).

4. The dust-proof valve for ventilation duct according to claim 3, characterized in that: The adapter plate (1721) on the flap is adapted to the valve body sealing side block (18), the lower top sealing plate (174) is nested in the lower top sealing plate (174) and is fixed by the embedded spring tube (173), the raised part of the lower top sealing plate (174) is fixed to the associated push rod (153), the drive shaft (171) is matched with the drive device (14), and the lower top sealing plate (174) is engaged with the grooved guide block body (151) and the arc guide rail (152).

5. The dust-proof valve for ventilation duct according to claim 2, characterized in that: An inclined guide block (361) is provided in the cleaning assembly (36), an even number of fixing frames (362) are fixed on the surface of the inclined guide block (361), a connecting rod rotating frame (365) is installed on the inner wall of the fixing frame (362), an even number of nesting rods (363) are connected to the connecting rod rotating frame (365), and elastic stretching rods (364) are installed between the even number of nesting rods (363), and an in-slot slide rail (371) is provided in the through slot (37).

6. The dust-proof valve for a ventilation duct according to claim 5, characterized in that: The inclined guide block (361) is used to guide the dust on the dustproof net on the dustproof net reel (33). A cleaning brush and a cleaning brush can be installed on the nesting rod (363) respectively. The lower part of the nesting rod (363) is opposite to the through groove (37). The lower part of the through groove (37) is opposite to the through groove (37). The through groove (37) is engaged with the frame (31).

7. The dust-proof valve for ventilation duct according to claim 1, characterized in that: Top frames (12) are installed on both sides of the outer wall of the valve housing (11), a connecting rod tube (16) is fixed on the outer wall of the top frame (12), and a tension rod (13) is connected to the connecting rod tube (16) and the upper surface of the valve housing (11), and the driving device (14) is arranged on the inner side of the top frame (12).

8. The dust-proof valve for a ventilation duct according to claim 7, characterized in that: A driving wheel (141) is provided in the driving device (14), a driven wheel (143) is provided below the driving wheel (141), and a transmission belt (142) is connected between the driven wheel (143) and the driving wheel (141).

9. The dust-proof valve for a ventilation duct according to claim 8, characterized in that: The driven wheel (143) is connected to the valve body (17), the driving device (14) is composed of a motor and a controller, and the connecting rod cylinder (16) and the valve housing (11) are both hoisted by the tension rod (13).

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