A laboratory ventilation device with automatic opening and closing of smoke filtering function

Abstract

The present invention provides a laboratory ventilation device with a self-opening and closing smoke filtering function, belonging to the technical field of ventilation equipment. The technical scheme is as follows: it includes a ventilation duct, a smoke sensor, a filtering component, a fan, a controller and a relay, and a duct cleaning mechanism is arranged in the ventilation duct; the ventilation duct includes an air inlet duct and an air outlet duct; the filtering component includes a primary filter, a HEPA filter and an activated carbon filter. The beneficial effect of the present invention is that the device can clean the dust and other particles stuck inside the duct by arranging a duct cleaning mechanism, avoiding the low efficiency and excessive labor caused by manual cleaning, and improving the cleaning efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of ventilation equipment, and in particular to laboratory ventilation equipment capable of automatically opening and closing a smoke filtering function. Background Art

[0002] The laboratory is a place for various scientific research, experimental analysis and related technology development. During the experiment, it often involves the use and treatment of a variety of chemical substances, biological samples, particulate matter, etc. Ventilation ducts play a vital role in the laboratory. Its main function is to discharge harmful gases, odors and tiny particles generated in the laboratory to the outside to maintain good air quality inside the laboratory, ensure the health and safety of the experimenters, and also provide suitable environmental conditions for the accurate conduct of the experiment.

[0003] As the ventilation system continues to operate, some pollutants and dust particles will gradually adhere to the inner wall of the pipe. It is time-consuming and laborious to dismantle the pipe for cleaning. For the cleaning of straight pipes, the present invention provides a laboratory ventilation device with a self-opening and closing smoke filtering function. Summary of the invention

[0004] The object of the present invention is to provide a laboratory ventilation device which is simple to operate, can effectively clean the pipeline and has the function of automatically opening and closing the smoke filter.

[0005] The present invention is achieved by the following measures:

[0006] A laboratory ventilation device capable of automatically opening and closing a smoke filter function, characterized in that it comprises a ventilation duct, a smoke sensor, a filter component, a fan, a controller and a relay, wherein a duct cleaning mechanism is arranged in the ventilation duct;

[0007] The ventilation duct includes an air inlet duct and an air outlet duct;

[0008] The filter components include a primary filter, a HEPA filter and an activated carbon filter, and the filter components can be arranged near the connection point between the ventilation duct and the interior of the laboratory after being integrated;

[0009] The controller, such as a single chip microcomputer, can receive the signal from the smoke sensor and determine whether to turn on or off the smoke filter function according to the preset program and threshold value. It can coordinate the work of various components, such as controlling the speed of the fan, monitoring the status of the filter component, etc.;

[0010] The relay is used to control the on and off of the circuit, and to turn on or off the power of the fan, filter and other equipment according to the instructions of the controller, so as to realize the automatic opening and closing of the smoke filtering function.

[0011] The specific features of the present invention also include:

[0012] The pipeline cleaning mechanism includes a circular ring that matches the inner diameter of the ventilation duct and slides along the ventilation duct. The setting of the circular ring does not affect the ventilation performance, so it can always exist in the ventilation duct. A convex ring that is coaxial with the circular ring and protrudes from the circular ring is provided on one side of the circular ring. A rotating ring is rotatably provided on the periphery of the convex ring. A plurality of bristles are provided on the periphery of the rotating ring, and dust and other dirt on the inner wall of the ventilation duct can be brushed off by the bristles.

[0013] Annular blades that fit the inner wall of the ventilation duct are arranged on both sides of the outer surface of the circular ring. During the sliding process of the circular ring, the annular blades can clean and cut off the dirt adhering to the inner wall of the ventilation duct.

[0014] A pair of slide grooves are provided on the inner side wall of the ventilation duct, a guide rod is provided in the slide groove on one side, a screw rod is rotatably provided in the slide groove on the other side, a guide slider is provided on the periphery of the guide rod, a screw slider is provided on the periphery of the screw rod, and the ring is provided between the guide slider and the screw slider;

[0015] The corresponding end of the screw rod passes through the free end of the ventilation duct and is connected to the driving mechanism.

[0016] A second slide groove is provided on the inner wall of the ventilation duct, and a rack is provided in the second slide groove;

[0017] A gear 1 is arranged on the outer side of the outer periphery of the rotating ring away from the bristles, an L-shaped bracket is arranged on the outer periphery of the circular ring, the L-shaped bracket is in the second slide slot, so as to avoid interference with the bristles, a rotating shaft 1 is arranged on the side of the L-shaped bracket through the bracket 1, a gear 2 meshing with the gear 1 is arranged at one end of the rotating shaft 1, and a bevel gear 1 is arranged at the other end of the rotating shaft 1;

[0018] The L-shaped bracket is provided with a rotating shaft 2, one end of which is provided with a bevel gear 2 meshing with the bevel gear 1, and the other end of which is provided with a gear 3 meshing with the rack. Under the action of the driving mechanism, the screw rotates to drive the circular ring to slide, so that the gear 3 rotates under the action of the rack, and then the gear 2 drives the gear 1 to rotate through the action of the bevel gear 1 and the bevel gear 2, so that the convex ring rotates, so that the bristles rotate to brush the inner wall of the ventilation duct.

[0019] The driving mechanism comprises a mounting plate arranged on one side of the free end face of the ventilation duct, a motor is arranged on the mounting plate, a gear 4 is arranged at the output end of the motor, a rotating shaft 3 is arranged on one side of the mounting plate through a bracket 2, and a gear 5 meshing with the gear 4 is arranged at one end of the rotating shaft 3;

[0020] A rectangular groove is arranged on the end surface of one end of the rotating shaft 3 facing the screw rod, a threaded hole 1 penetrating the rotating shaft 3 is arranged on the inner end surface of the rectangular groove, a threaded rod matching with the rotating shaft 3 is arranged in the threaded hole 1, a rectangular rod matching with the rectangular groove is rotatably arranged on the inner end of the threaded rod, and a handle is arranged on the outer end of the threaded rod;

[0021] A rectangular slot matching the rectangular rod is arranged on the corresponding end surface of the screw rod, and the free end of the rectangular rod is inserted into the rectangular slot, so that the screw rod can be driven to rotate by the motor, thereby driving the ring to slide along the ventilation duct.

[0022] A fixing plate is provided on one side of the free end face of the ventilation duct, the mounting plate is hinged on the fixing plate, a locking bolt is provided on the mounting plate, and a threaded hole 2 matching with the locking bolt is provided on the corresponding fixing plate, and when the rectangular rod is inserted into the rectangular slot, the mounting plate and the fixing plate are fixed by the locking bolt;

[0023] A storage box is arranged at one side of the fixing plate. Usually, the driving mechanism is stored in the storage box after rotation and is connected with the screw rod when in use, so that the driving mechanism can avoid the influence of the ventilation duct.

[0024] The pipeline cleaning mechanism also includes a sewage discharge mechanism, which includes a T-shaped plate, and a T-shaped notch matched with the T-shaped plate is provided on the ventilation duct, and the T-shaped notch is provided at the lowest point of the ventilation duct. After the T-shaped plate slides into the T-shaped notch, a complete ventilation duct is formed. During the cleaning process of the annular blade and the bristles, dust and other particles will fall on the T-shaped notch;

[0025] Two groups of support parts are arranged on the outer side surfaces of the ventilation duct on both sides of the T-shaped notch, and the two groups of support parts are arranged on both sides of the ventilation duct respectively, and each group of support parts includes a pair of support rods arranged in parallel, and a horizontal plate is arranged between the support parts on both sides, and a support column with an external thread is arranged on the horizontal plate, and a matching sleeve is arranged on the periphery of the support column, and the upper end of the sleeve is rotatably arranged on the T-shaped plate;

[0026] An auxiliary rod corresponding to the bracket rod is arranged on the outer side surface of the T-shaped plate, and a sliding slot cooperating with the bracket rod is arranged on the auxiliary rod. The T-shaped plate slides up and down along the bracket rod through the sliding slot. Specifically, four groups of auxiliary rods are arranged, and correspond to the corresponding bracket rods.

[0027] A rotating handle is arranged on the periphery of the sleeve, and the sleeve is rotated by the rotating handle, so that the T-shaped plate can slide up and down.

[0028] A slide groove three is provided on the inner side surfaces of the two corresponding bracket rods. A receiving box matching the T-shaped notch is slidably provided through the slide groove three. Dust and other particles generated during the cleaning process will fall into the receiving box for collection.

[0029] The T-shaped notch and the two side surfaces of the T-shaped plate are provided with notch grooves, and the T-shaped plate is provided with a sealing gasket matched with the notch grooves.

[0030] Usually, the circular ring is directly arranged in the ventilation duct. Since it is an annular structure, it will not affect the ventilation of the ventilation duct. When in use, the driving mechanism is first rotated out of the storage box, and then the rectangular rod is driven to slide and insert into the rectangular slot by rotating the handle through the threaded rod, and then the rotating handle is rotated so that the sleeve drives the T-shaped plate to slide down along the bracket rod, and then the receiving box is slid into the lower side of the T-shaped notch along the slide groove three, and then the motor is started to drive the screw rod to rotate, thereby driving the circular ring to slide along the ventilation duct. During the sliding process, the gear three is rotated under the action of the rack, and then the gear two drives the gear one to rotate through the action of the bevel gear one and the bevel gear two, so that the convex ring rotates, so that the bristles rotate to brush the inner wall of the ventilation duct, and at the same time, the annular blade can clean and cut off the dirt stuck on the inner wall of the ventilation duct, and the fallen dust and other particles will fall into the receiving box below to complete the cleaning work.

[0031] The beneficial effects of the present invention are as follows: by arranging a pipeline cleaning mechanism in the device, dust and other particles stuck inside the pipeline can be cleaned, thereby avoiding the low efficiency and excessive labor caused by manual cleaning and improving the cleaning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention.

[0033] Figure 2 for Figure 1 A is an enlarged view of the middle image.

[0034] Figure 3 for Figure 1 Enlarged view of B.

[0035] Figure 4 Schematic diagram of a partial structure of a pipeline cleaning mechanism in an embodiment of the present invention.

[0036] Figure 5 Schematic diagram of the structure of a rectangular rod and a threaded rod in an embodiment of the present invention.

[0037] Figure 6It is a structural schematic diagram of pipeline cleaning in an embodiment of the present invention.

[0038] Among them, the figure markings are: 1. ventilation duct; 2. bristles; 3. gear one; 4. gear two; 5. bevel gear one; 6. bevel gear two; 7. circular ring; 8. gear three; 9. screw rod; 10. gear five; 11. gear four; 12. storage box; 13. motor; 14. mounting plate; 15. fixing plate; 16. T-shaped plate; 17. bracket rod; 18. horizontal plate; 19. support column; 20. sleeve; 21. rotating handle; 22. rack; 23. L-shaped bracket; 24. rotating shaft three; 25. threaded rod; 26. rotating ring; 27. annular blade; 28. bracket one; 29. ​​rectangular rod; 30. receiving box; 31. T-shaped notch. DETAILED DESCRIPTION

[0039] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are 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 limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0041] 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, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or 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 by specific circumstances.

[0042] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0043] See also Figure 1-6, a laboratory ventilation device capable of automatically opening and closing a smoke filter function, comprising a ventilation duct 1, a smoke sensor, a filter component, a fan, a controller and a relay, wherein a duct cleaning mechanism is arranged in the ventilation duct 1;

[0044] The ventilation duct 1 includes an air inlet duct and an air outlet duct;

[0045] The filter components include a primary filter, a HEPA filter and an activated carbon filter. After being integrated, the filter components can be arranged near the connection point between the ventilation duct 1 and the interior of the laboratory;

[0046] The controller, such as a single-chip microcomputer, can receive the signal from the smoke sensor and determine whether to turn on or off the smoke filter function according to the preset program and threshold. It can coordinate the work of various components, such as controlling the speed of the fan, monitoring the status of the filter components, etc.

[0047] The relay is used to control the on and off of the circuit, and to turn on or off the power of the fan, filter and other equipment according to the instructions of the controller, so as to realize the automatic opening and closing of the smoke filtering function.

[0048] The duct cleaning mechanism includes a circular ring 7 that matches the inner diameter of the ventilation duct 1 and slides along the ventilation duct 1. The setting of the circular ring 7 does not affect the ventilation performance, so it can always exist in the ventilation duct 1. A convex ring that is coaxial with the circular ring 7 and protrudes from the circular ring 7 is provided on one side of the circular ring 7. A rotating ring 26 is rotatably provided on the periphery of the convex ring. A plurality of bristles 2 are provided on the periphery of the rotating ring 26. The bristles 2 can be used to brush away dust and other dirt on the inner wall of the ventilation duct 1.

[0049] Annular blades 27 that fit the inner wall of the ventilation duct 1 are arranged on both sides of the outer surface of the circular ring 7. During the sliding process of the circular ring 7, the annular blades 27 can clean and cut off the dirt adhering to the inner wall of the ventilation duct 1.

[0050] A pair of slide grooves 1 are arranged on the inner wall of the ventilation duct 1, a guide rod is arranged in one slide groove 1, a screw rod 9 is rotatably arranged in the other slide groove 1, a guide slider is arranged on the periphery of the guide rod, a screw slider is arranged on the periphery of the screw rod 9, and a ring 7 is arranged between the guide slider and the screw slider;

[0051] The corresponding end of the screw rod 9 passes through the free end of the ventilation duct 1 and is connected to the driving mechanism.

[0052] A second slide groove is provided on the inner wall of the ventilation duct 1, and a rack 22 is provided in the second slide groove;

[0053] A gear 1 3 is arranged on the outer side of the rotating ring 26 away from the bristles 2, an L-shaped bracket 23 is arranged on the outer side of the ring 7, the L-shaped bracket 23 is in the slide groove 2, so as to avoid interference with the bristles 2, a rotating shaft 1 is arranged on the side of the L-shaped bracket 23 through a bracket 1 28, a gear 2 4 meshing with the gear 1 3 is arranged at one end of the rotating shaft 1, and a bevel gear 1 5 is arranged at the other end of the rotating shaft 1;

[0054] A rotating shaft 2 is provided on the L-shaped bracket 23, and a bevel gear 2 6 meshing with a bevel gear 1 5 is provided at one end of the rotating shaft 2, and a gear 3 8 meshing with a rack 22 is provided at the other end of the rotating shaft 2. Under the action of the driving mechanism, the screw 9 rotates, driving the ring 7 to slide, so that the gear 3 8 rotates under the action of the rack 22, and then the gear 2 4 drives the gear 1 3 to rotate through the action of the bevel gear 1 5 and the bevel gear 2 6, so that the convex ring rotates, so that the bristles 2 rotate to brush the inner wall of the ventilation duct 1.

[0055] The driving mechanism includes a mounting plate 14 arranged on one side of the free end face of the ventilation duct 1, a motor 13 is arranged on the mounting plate 14, a gear 4 11 is arranged at the output end of the motor 13, a rotating shaft 3 24 is arranged on one side of the mounting plate 14 through a bracket 2, and a gear 5 10 meshing with the gear 4 11 is arranged at one end of the rotating shaft 3 24;

[0056] A rectangular groove is provided on the end surface of the rotating shaft 3 24 facing the screw rod 9, a threaded hole 1 penetrating the rotating shaft 3 24 is provided on the inner end surface of the rectangular groove, a threaded rod 25 matching therewith is provided in the threaded hole 1, a rectangular rod 29 slidingly matched with the rectangular groove is rotatably provided on the inner end of the threaded rod 25, and a handle is provided on the outer end of the threaded rod 25;

[0057] A rectangular slot matching the rectangular rod 29 is provided on the corresponding end face of the screw rod 9, and the free end of the rectangular rod 29 is inserted into the rectangular slot, so that the screw rod 9 can be driven to rotate by the motor 13, thereby driving the ring 7 to slide along the ventilation duct 1.

[0058] A fixing plate 15 is provided on one side of the free end face of the ventilation duct 1, and a mounting plate 14 is hinged on the fixing plate 15. A through locking bolt is provided on the mounting plate 14, and a threaded hole 2 that matches the locking bolt is provided on the corresponding fixing plate 15. When the rectangular rod 29 is inserted into the rectangular slot, the mounting plate 14 and the fixing plate 15 are fixed by the locking bolt.

[0059] A storage box 12 is provided on one side of the fixing plate 15 . Usually, the driving mechanism is stored in the storage box 12 after rotation, and is connected to the screw rod 9 when in use, so as to avoid the influence of the driving mechanism on the ventilation duct 1 .

[0060] The pipe cleaning mechanism also includes a sewage discharge mechanism, which includes a T-shaped plate 16. A T-shaped notch 31 matching the T-shaped plate 16 is provided on the ventilation duct 1. The T-shaped notch 31 is provided at the lowest point of the ventilation duct 1. After the T-shaped plate 16 slides into the T-shaped notch 31, a complete ventilation duct 1 is formed. During the cleaning process by the annular blade 27 and the bristles 2, dust and other particles will fall on the T-shaped notch 31.

[0061] Two groups of support parts are arranged on the outer side of the ventilation duct 1 on both sides of the T-shaped notch 31. The two groups of support parts are arranged on both sides of the ventilation duct 1 respectively. Each group of support parts includes a pair of support rods 17 arranged in parallel. A horizontal plate 18 is arranged between the support parts on both sides. A support column 19 with an external thread is arranged on the horizontal plate 18. A matching sleeve 20 is arranged on the outer periphery of the support column 19. The upper end of the sleeve 20 is rotatably arranged on the T-shaped plate 16.

[0062] An auxiliary rod corresponding to the bracket rod 17 is arranged on the outer side of the T-shaped plate 16, and a sliding slot cooperating with the bracket rod 17 is arranged on the auxiliary rod. The T-shaped plate 16 slides up and down along the bracket rod 17 through the sliding slot. There are four groups of auxiliary rods corresponding to the corresponding bracket rods 17.

[0063] A rotating handle 21 is disposed on the periphery of the sleeve 20 , and the sleeve 20 is rotated by rotating the handle 21 , thereby achieving the up and down sliding of the T-shaped plate 16 .

[0064] Slide grooves three are provided on the opposite inner sides of the two corresponding support rods 17, and a receiving box 30 that cooperates with the T-shaped notch 31 is slidably provided through the slide grooves three. Dust and other particles generated during the cleaning process will fall into the receiving box 30 for collection.

[0065] Notch grooves are provided on both side surfaces of the T-shaped notch 31 and the T-shaped plate 16 , and a sealing gasket matching the notch grooves is provided on the T-shaped plate 16 .

[0066] Usually, the circular ring 7 is directly arranged in the ventilation duct 1. Since it is an annular structure, it will not affect the ventilation of the ventilation duct 1. When in use, the driving mechanism is first rotated out of the storage box 12, and then the rectangular rod 29 is driven to slide and insert into the rectangular slot by rotating the handle through the threaded rod 25, and then the rotating handle 21 is rotated to make the sleeve 20 drive the T-shaped plate 16 to slide down along the bracket rod 17, and then the receiving box 30 is slid into the lower side of the T-shaped notch 31 along the slide groove three, and then the motor 13 is started to drive the screw rod 9 to rotate, thereby driving the circular ring 7 to slide along the ventilation duct 1. During the sliding process, the gear three 8 is rotated under the action of the rack 22, and then the gear two 4 drives the gear one 3 to rotate through the action of the bevel gear one 5 and the bevel gear two 6, so that the convex ring rotates, so that the bristles 2 rotate to brush the inner wall of the ventilation duct 1, and at the same time, the annular blade 27 can clean and cut off the dirt stuck on the inner wall of the ventilation duct 1, and the fallen dust and other particles will fall into the receiving box 30 below to complete the cleaning work.

[0067] Technical features not described in the present invention can be achieved through or by adopting existing technologies and will not be described in detail here. Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. A laboratory ventilation device with automatic opening and closing of smoke filtering function, characterized in that: It comprises a ventilation duct (1), a smoke sensor, a filter component, a fan, a controller and a relay, wherein a duct cleaning mechanism is arranged in the ventilation duct (1); The ventilation duct (1) comprises an air inlet duct and an air outlet duct; The filtering components include a primary filter, a HEPA filter and an activated carbon filter; The pipeline cleaning mechanism comprises a circular ring (7) which matches the inner diameter of the ventilation pipeline (1) and slides along the ventilation pipeline (1); a convex ring which is coaxial with the circular ring (7) and protrudes from the circular ring (7) is arranged on one side of the circular ring (7); a rotating ring (26) is rotatably arranged on the periphery of the convex ring; and a plurality of bristles (2) are arranged on the periphery of the rotating ring (26); Annular blades (27) are provided on both sides of the outer surface of the circular ring (7) and are in contact with the inner wall of the ventilation duct (1); A pair of slide grooves are provided on the inner side wall of the ventilation duct (1), a guide rod is provided in the slide groove on one side, a screw rod (9) is rotatably provided in the slide groove on the other side, a guide slider is provided on the periphery of the guide rod, a screw slider is provided on the periphery of the screw rod (9), and the ring (7) is provided between the guide slider and the screw slider; The corresponding end of the screw rod (9) passes through the free end of the ventilation duct (1) and is connected to the driving mechanism; A second slide groove is provided on the inner wall of the ventilation duct (1), and a rack (22) is provided in the second slide groove; A gear 1 (3) is arranged on the outer side of the rotating ring (26) away from the bristles (2); an L-shaped bracket (23) is arranged on the outer side of the circular ring (7); the L-shaped bracket (23) is in the second slide groove; a rotating shaft 1 is arranged on the side of the L-shaped bracket (23) through a bracket 1 (28); a gear 2 (4) meshing with the gear 1 (3) is arranged at one end of the rotating shaft 1; and a bevel gear 1 (5) is arranged at the other end of the rotating shaft 1; The L-shaped bracket (23) is provided with a second rotating shaft, one end of which is provided with a second bevel gear (6) meshing with the first bevel gear (5), and the other end of which is provided with a third gear (8) meshing with the rack (22); The driving mechanism comprises a mounting plate (14) arranged on one side of the free end surface of the ventilation duct (1), a motor (13) being arranged on the mounting plate (14), a gear four (11) being arranged at the output end of the motor (13), a rotating shaft three (24) being arranged on one side of the mounting plate (14) through a bracket two, and a gear five (10) meshing with the gear four (11) being arranged at one end of the rotating shaft three (24); A rectangular groove is arranged on the end surface of one end of the rotating shaft (24) facing the screw rod (9), a threaded hole (1) penetrating the rotating shaft (24) is arranged on the inner end surface of the rectangular groove, a threaded rod (25) matching with the rotating shaft (24) is arranged in the threaded hole (1), a rectangular rod (29) slidingly matched with the rectangular groove is rotatably arranged at the inner end of the threaded rod (25), and a handle is arranged at the outer end of the threaded rod (25); A rectangular slot matching the rectangular rod (29) is arranged on the corresponding end surface of the screw rod (9), and the free end of the rectangular rod (29) is inserted into the rectangular slot.

2. The laboratory ventilation equipment with automatic opening and closing of smoke filtering function according to claim 1 is characterized in that: A fixing plate (15) is provided on one side of the free end surface of the ventilation duct (1), the fixing plate (15) is hingedly connected to the mounting plate (14), the mounting plate (14) is provided with a through locking bolt, and the fixing plate (15) is correspondingly provided with a second threaded hole that cooperates with the locking bolt; A storage box (12) is provided on one side of the fixing plate (15).

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