A type of lift-up lectern

Abstract

This utility model belongs to the field of lectern technology, specifically a lifting lectern, including a fixed box. A tabletop is provided on the top side of the fixed box, and a lifting sleeve is fixedly connected to the bottom side of the tabletop. The lifting sleeve is slidably connected to the inner wall of the fixed box. This utility model uses a dual-axis motor to drive the transmission rods on both sides to rotate synchronously, and the power direction is changed by the meshing of bevel gears. This drives the screw to rotate, so that the lifting plate can be raised and lowered smoothly along the limit rod. At the same time, the sliding cooperation between the lifting sleeve and the fixed box, and the guiding effect of the sliding rod and the fixed cylinder, further improve the synchronicity and stability of the tabletop lifting. It integrates a dust filter component. The negative pressure generated by the fan draws surface dust into the filter chamber through the air inlet, air inlet hopper and air inlet pipe of the tabletop. The dust is then filtered through multiple filters of the dust filter cartridge and filter plate to achieve efficient dust removal. At the same time, the dust filter cartridge is detachable by a threaded sleeve, the sealing cover is easy to open for maintenance, and the filter plate can be easily removed and replaced.

Description

Technical Field

[0001] This utility model relates to the field of lectern technology, specifically a liftable lectern. Background Technology

[0002] A lectern is a specialized platform used for teaching, lecturing, or presentations. It typically consists of a tabletop, support frame, and storage space, and is usually made of wood, metal, or composite materials. Its design aims to provide users with a stable standing height and operating space. Its core functions include improving teaching efficiency, enhancing interactivity, and ensuring equipment safety. It is widely used in school classrooms, training centers, conference rooms, and other settings to support activities such as lectures, product demonstrations, and academic reports.

[0003] Traditional lecterns are mostly designed with a fixed height, which makes it difficult to meet the needs of users of different heights. At the same time, during long-term use, chalk dust, dirt and other debris easily accumulate on the surface of the lectern. Manual cleaning is not only time-consuming and laborious, but the dust floating in the air can also cause serious damage to the health of users. Therefore, we propose a height-adjustable lectern. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a liftable lectern. The lectern panel is raised and lowered stably using a lifting component, and the lectern and air are filtered and collected using a dust filter component, thus solving the background problem.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a lifting lectern includes a fixed box, a tabletop is provided on the top side of the fixed box, a lifting sleeve is fixedly connected to the bottom side of the tabletop, the lifting sleeve is slidably connected to the inner wall of the fixed box, a dust cover is also fixedly connected to the bottom side of the tabletop, the dust cover is slidably fitted onto the outer surface of the fixed box, a lifting assembly for driving the tabletop to rise and fall is installed on the inner bottom side of the fixed box, and a dust filter assembly is also installed on the inner rear side of the fixed box; the lifting assembly includes a dual-axis motor, the dual-axis motor is fixedly installed on the inner bottom side of the fixed box, transmission rods are fixedly connected to the left and right output shaft ends of the dual-axis motor, bearing seats are sleeved on the left and right sides of the two sets of transmission rods, four sets of bearing seats are fixedly installed on the inner bottom side of the fixed box, and a lifting mechanism is also installed on the left and right sides of the inner side of the fixed box.

[0006] Preferably, the lifting mechanism includes two sets of mounting plates, both sets of mounting plates are fixedly welded to the rear inner wall of the fixed box, and limit rods are fixedly connected to the front and rear sides of the two sets of mounting plates. A screw is rotatably installed in the middle between the two sets of mounting plates, and a lifting plate is threaded onto the screw. The front and rear parts of the lifting plate are slidably sleeved on the two sets of limit rods respectively. A bevel gear is fixedly sleeved on the bottom outer surface of the screw and the end of the transmission rod near the screw. The two sets of bevel gears mesh with each other. Support plates are fixedly connected to the left and right sides of the lifting plate, and the tops of the two sets of support plates are fixedly installed on the bottom side of the platform.

[0007] Preferably, the dust filtration assembly includes a fan, a fixed plate is fixedly connected to the rear side of the fixed box, the fan is fixedly installed on the top side of the fixed plate, the input end and output end of the fan are respectively fixedly connected to an exhaust pipe and an exhaust pipe, a filter compartment is provided on the rear side of the fixed box, the input end of the exhaust pipe is fixedly connected to the middle of the front side of the filter compartment, a filter plate is fixedly connected at the connection between the exhaust pipe and the filter compartment, an air outlet is opened on the rear side of the fixed box, the output end of the exhaust pipe is fixedly connected to the air outlet, and a dust collection mechanism is provided between the table panel and the filter compartment.

[0008] Preferably, the dust collection mechanism includes an air inlet pipe, which is located inside the rear side of the fixed box. The top of the filter compartment has a connecting port, and the bottom output end of the air inlet pipe is fixedly connected to the connecting port. The table panel has two sets of air inlets, and the bottom sides of the two sets of air inlets are fixedly connected to air inlet hoppers. The bottom output ends of the two sets of air inlet hoppers are fixedly connected to the input end of the air inlet pipe through pipes. The filter compartment is also equipped with a dust collection mechanism.

[0009] Preferably, the dust collection mechanism includes a dust filter cartridge, which is disposed inside the filter chamber. A threaded sleeve is fixedly connected to the bottom end of the communication port, and the top opening of the dust filter cartridge is threadedly inserted into the threaded sleeve. A sealing cover is hinged to the top rear side of the filter chamber.

[0010] Preferably, sliding rods are fixedly welded to the four corners of the inner wall of the lifting sleeve, and fixed cylinders are fixedly welded to the four corners of the inner wall of the fixed box, with the bottom end of the sliding rod slidingly passing through the inside of the fixed cylinder.

[0011] Preferably, a limiting plate is also provided between the lifting plate and the bevel gear. The front and rear parts of the limiting plate are respectively fixedly sleeved on two sets of limiting rods, and the limiting plate is sleeved on the outside of the screw.

[0012] Preferably, a second filter plate is snapped onto the top of the air inlet, and the top front and rear sides of the second filter plate are provided with snap-on grooves.

[0013] Preferably, the front left and right sides of the fixed box are provided with storage compartments, and the front sides of the two sets of storage compartments are hinged with cabinet doors. The inner wall of one set of storage compartments is fixedly connected with several partitions.

[0014] Preferably, a number of support blocks are fixedly installed at the bottom of the fixed box.

[0015] This utility model provides a height-adjustable lectern. Compared with the prior art, it has the following advantages:

[0016] 1. This type of lifting lectern uses a dual-axis motor to drive the transmission rods on both sides to rotate synchronously. The engagement of bevel gears enables the conversion of power direction, which drives the screw to rotate and makes the lifting plate rise and fall smoothly along the limit rod. At the same time, the sliding fit between the lifting sleeve and the fixed box, as well as the guiding effect between the sliding rod and the fixed cylinder, further improve the synchronicity and stability of the lifting of the lectern.

[0017] 2. This type of lifting lectern integrates a dust filtration system. By generating negative pressure through a fan, surface dust is drawn into the filter chamber through the air inlet, air hopper, and air duct of the lectern panel. The dust is then filtered through multiple filters, including the dust cartridge and filter plates, to achieve efficient dust removal. This reduces dust accumulation on the lectern and the burden of manual cleaning. At the same time, the dust cartridge is removable via a threaded sleeve, and the sealing cover is easy to open for maintenance. The filter plates can be easily removed and replaced, thus achieving the filtration and collection of pen dust and other dust from the lectern and the air. Attached Figure Description

[0018] Figure 1 This is a front view structural diagram of the main body of this utility model;

[0019] Figure 2 This is a schematic diagram of the internal structure of the storage compartment of this utility model;

[0020] Figure 3 This is a schematic diagram of the front cross-sectional structure of the main body of this utility model;

[0021] Figure 4 This is a schematic diagram of the rear cross-sectional structure of the main body of this utility model;

[0022] Figure 5 This is a schematic diagram of the rear part of the main body of this utility model;

[0023] Figure 6 This is a schematic diagram of the right-side cross-sectional structure of the main body of this utility model;

[0024] Figure 7 This utility model Figure 1 Enlarged schematic diagram of the structure at point A in the middle;

[0025] Figure 8 This utility model Figure 6 Enlarged schematic diagram of the structure at point B.

[0026] In the diagram: 1. Fixed box; 2. Tabletop; 3. Cabinet door; 4. Storage compartment; 5. Partition; 6. Lifting sleeve; 7. Dust cover; 8. Sliding rod; 9. Fixed cylinder; 10. Fixed plate; 11. Dual-axis motor; 12. Bearing seat; 13. Transmission rod; 14. Mounting plate; 15. Limiting rod; 16. Lifting plate; 17. Screw; 18. Support plate; 19. Bevel gear; 20. Limiting plate; 21. Fan; 22. Exhaust duct; 23. Exhaust duct; 24. Filter compartment; 25. Inlet duct; 26. Inlet; 27. Inlet hopper; 28. Filter plate one; 29. ​​Sealing cover; 30. Dust filter cartridge; 31. Outlet; 32. Support block; 33. Filter plate two; 34. Clip groove; 35. Threaded sleeve; 36. Connecting port. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figure 1-8 This utility model provides a technical solution: a lifting lectern, including a fixed box 1, a table panel 2 is provided on the top side of the fixed box 1, a lifting sleeve 6 is fixedly connected to the bottom side of the table panel 2, the lifting sleeve 6 is slidably connected to the inner wall of the fixed box 1, a dust cover 7 is also fixedly connected to the bottom side of the table panel 2, the dust cover 7 is slidably fitted on the outer surface of the fixed box 1, a lifting assembly for driving the table panel 2 to rise and fall is installed on the bottom side inside the fixed box 1, and a dust filter assembly is also installed on the rear side inside the fixed box 1;

[0029] When the lifting lectern is in use, the lifting component on the bottom side of the fixed box 1 can drive the tabletop 2 to rise and fall. The lifting sleeve 6 on the bottom side of the tabletop 2 slides on the inner wall of the fixed box 1. At the same time, the dust cover 7 on the bottom side of the tabletop 2 slides on the outer surface of the fixed box 1 to prevent dust from entering the equipment. The dust filter component on the rear side of the fixed box 1 can perform dust filtering operation.

[0030] The lifting assembly includes a dual-axis motor 11, which is fixedly installed on the bottom inside of the fixed box 1. The left and right output shaft ends of the dual-axis motor 11 are fixedly connected to transmission rods 13. The left and right sides of the two sets of transmission rods 13 are fitted with bearing seats 12. The four sets of bearing seats 12 are fixedly installed on the bottom inside of the fixed box 1. The left and right sides inside the fixed box 1 are also equipped with lifting mechanisms.

[0031] The lifting mechanism includes two sets of mounting plates 14, both of which are fixedly welded to the rear inner wall of the fixed box 1. Limiting rods 15 are fixedly connected to the front and rear sides of the two sets of mounting plates 14, and a screw 17 is rotatably installed in the middle between the two sets of mounting plates 14. A lifting plate 16 is threaded on the screw 17, and the front and rear parts of the lifting plate 16 are slidably sleeved on the two sets of limiting rods 15 respectively. A bevel gear 19 is fixedly sleeved on the bottom outer surface of the screw 17 and the end of the transmission rod 13 near the screw 17. The two sets of bevel gears 19 mesh with each other. Support plates 18 are fixedly connected to the left and right sides of the lifting plate 16, and the tops of the two sets of support plates 18 are fixedly installed on the bottom side of the platform 2.

[0032] When the lifting assembly is working, the dual-axis motor 11 is fixedly installed on the bottom inside of the fixed box 1. Its left and right output shaft ends drive two sets of transmission rods 13 to rotate. The left and right sides of the two sets of transmission rods 13 are stably supported on the bottom inside of the fixed box 1 by four sets of bearing seats 12. Two sets of mounting plates 14 are provided on the left and right sides inside the fixed box 1 and are fixedly welded to the rear inner wall of the fixed box 1. Limiting rods 15 are provided on the front and rear sides between the two sets of mounting plates 14. A screw 17 is rotatably installed in the middle. The end of the transmission rod 13 near the screw 17 is driven by the bottom outer surface of the screw 17 through the meshing bevel gears 19, which makes the screw 17 rotate. The lifting plate 16, which is threaded on the screw 17, slides along the two sets of limiting rods 15. The support plates 18 on the left and right sides of the lifting plate 16 drive the platform 2 to rise and fall accordingly.

[0033] The dust filtration assembly includes a fan 21. A fixed plate 10 is fixedly connected to the rear side of the interior of the fixed box 1. The fan 21 is fixedly installed on the top side of the fixed plate 10. The input end and output end of the fan 21 are respectively fixedly connected to an exhaust pipe 22 and an exhaust pipe 23. A filter chamber 24 is provided on the rear side of the fixed box 1. The input end of the exhaust pipe 22 is fixedly connected to the middle of the front side of the filter chamber 24. A filter plate 28 is fixedly connected at the connection between the exhaust pipe 22 and the filter chamber 24. An air outlet 31 is opened on the rear side of the fixed box 1. The output end of the exhaust pipe 23 is fixedly connected to the air outlet 31. A dust collection mechanism is provided between the table panel 2 and the filter chamber 24.

[0034] The dust collection mechanism includes an air inlet pipe 25, which is located inside the rear side of the fixed box 1. The top of the filter compartment 24 has a connecting port 36, and the bottom output end of the air inlet pipe 25 is fixedly connected to the connecting port 36. Two sets of air inlets 26 are provided on the table panel 2. The bottom sides of the two sets of air inlets 26 are fixedly connected to air inlet hoppers 27. The bottom output ends of the two sets of air inlet hoppers 27 are fixedly connected to the input end of the air inlet pipe 25 through pipes. A dust collection mechanism is also provided inside the filter compartment 24.

[0035] The dust collection mechanism includes a dust filter cartridge 30, which is located inside the filter chamber 24. A threaded sleeve 35 is fixedly connected to the bottom end of the connecting port 36. The top opening of the dust filter cartridge 30 is threadedly inserted into the threaded sleeve 35, and a sealing cover 29 is hinged to the rear top of the filter chamber 24.

[0036] When the dust filtration assembly is working, the fan 21 is fixedly installed on the top side of the fixed plate 10 at the rear of the fixed box 1. Its input end is connected to the middle of the front side of the filter compartment 24 at the rear of the fixed box 1 through the exhaust pipe 22, and a filter plate 28 is provided at the connection between the exhaust pipe 22 and the filter compartment 24. The output end is connected to the air outlet 31 at the rear of the fixed box 1 through the air outlet pipe 23. The air inlet pipe 25 between the table panel 2 and the filter compartment 24 is located at the rear of the fixed box 1, and its bottom output end is fixedly connected to the connection port 36 at the top of the filter compartment 24. There are two sets of air inlets on the table panel 2. The bottom side of each of the two sets of air inlets 27 are connected to the inlet pipe 25 through a pipe. The top opening of the dust filter 30 inside the filter chamber 24 is threadedly inserted into the threaded sleeve 35 at the bottom of the connecting port 36. The top of the rear side of the filter chamber 24 is hinged with a sealing cover 29. When the fan 21 is working, the airflow enters the filter chamber 24 through the air inlet 26, air inlet 27, and air inlet pipe 25. After being filtered by the dust filter 30, it is discharged from the air outlet 31 through the filter plate 28, exhaust pipe 22, fan 21, and exhaust pipe 23. The dust remains in the dust filter 30.

[0037] Sliding rods 8 are fixedly welded to the four corners of the inner wall of the lifting sleeve 6, and fixing cylinders 9 are fixedly welded to the four corners of the inner wall of the fixing box 1. The bottom end of the sliding rod 8 slides through the inside of the fixing cylinder 9. The sliding rods 8 at the four corners of the inner wall of the lifting sleeve 6 and the fixing cylinders 9 at the four corners of the inner wall of the fixing box 1 cooperate with each other. When the platform 2 is raised or lowered, the bottom end of the sliding rod 8 slides inside the fixing cylinder 9, providing guidance and support for the raising and lowering of the platform 2, and enhancing the stability of the raising and lowering process.

[0038] A limiting plate 20 is also provided between the lifting plate 16 and the bevel gear 19. The front and rear parts of the limiting plate 20 are fixedly sleeved on two sets of limiting rods 15, and the limiting plate 20 is sleeved on the outside of the screw 17. The limiting plate 20 between the lifting plate 16 and the bevel gear 19, with its front and rear parts fixedly sleeved on two sets of limiting rods 15 and sleeved on the outside of the screw 17, can limit the downward stroke of the lifting plate 16, prevent the lifting plate 16 from falling excessively and colliding with the bevel gear 19, and play a role in protecting the components.

[0039] A filter plate 23 is snapped onto the top of the air inlet 26. The top and front sides of the filter plate 23 are provided with pull grooves 34. The filter plate 23 snapped onto the top of the air inlet 26 can perform preliminary filtration of the air entering the air inlet 26 and block larger impurities from entering. The pull grooves 34 on the top and front sides of the filter plate 23 make it easy for users to pull out the filter plate 23 for cleaning or replacement.

[0040] Storage compartments 4 are provided on the left and right sides of the front of the fixed box 1. Cabinet doors 3 are hinged to the front of both sets of storage compartments 4. Several partitions 5 are fixedly connected to the inner wall of one set of storage compartments 4. The storage compartments 4 on the left and right sides of the front of the fixed box 1 can be used to store items. The cabinet doors 3 on the front of the two sets of storage compartments 4 can seal and protect the inside of the storage compartments 4. Several partitions 5 on the inner wall of one set of storage compartments 4 can divide the internal space of the storage compartment 4, making it convenient to classify and store items.

[0041] Several support blocks 32 are fixedly installed at the bottom of the fixed box 1. The support blocks 32 installed at the bottom of the fixed box 1 support the fixed box 1, so that the bottom of the fixed box 1 is kept at a certain distance from the ground, so as to avoid the ground moisture directly affecting the internal components of the fixed box 1, and at the same time enhance the stability of the fixed box 1 when it is placed.

[0042] Working Principle: When this lifting lectern is in use, the dual-axis motor 11 is fixedly installed on the bottom side of the fixed box 1. Its left and right output shafts drive two sets of transmission rods 13 to rotate. The left and right sides of the two sets of transmission rods 13 are stably supported on the bottom side of the fixed box 1 by four sets of bearing seats 12. Two sets of mounting plates 14 are fixedly welded to the rear inner wall of the fixed box 1 on both the left and right sides. Limiting rods 15 are provided on the front and rear sides between the two sets of mounting plates 14. A screw 17 is rotatably installed in the middle. The end of the transmission rod 13 near the screw 17 is driven by the meshing bevel gear 19 to the bottom outer surface of the screw 17, causing the screw to rotate. When the screw 17 rotates, the lifting plate 16, which is threaded onto the screw 17, slides along the two sets of limit rods 15. The support plates 18 on the left and right sides of the lifting plate 16 then drive the platform 2 to rise and fall, which in turn drives the lifting sleeve 6 on the bottom side of the platform 2 to slide on the inner wall of the fixed box 1. The sliding rods 8 at the four corners of the inner wall of the lifting sleeve 6 cooperate with the fixed cylinders 9 at the four corners of the inner wall of the fixed box 1. When the platform 2 rises and falls, the bottom end of the sliding rod 8 slides inside the fixed cylinder 9, providing guidance and support for the rise and fall of the platform 2, and enhancing the stability of the rise and fall process. At the same time, the dust cover 7 on the bottom side of the platform 2 slides onto the outer surface of the fixed box 1 to prevent dust from entering the equipment.

[0043] Furthermore, since the fan 21 is fixedly installed on the top side of the fixed plate 10 inside the fixed box 1, its input end is connected to the front middle of the filter compartment 24 on the rear side of the fixed box 1 through the exhaust pipe 22, and a filter plate 28 is provided at the connection between the exhaust pipe 22 and the filter compartment 24. The output end is connected to the air outlet 31 on the rear side of the fixed box 1 through the air outlet pipe 23. The air inlet pipe 25 between the table panel 2 and the filter compartment 24 is located inside the rear side of the fixed box 1, and its bottom output end is fixedly connected to the connection port 36 on the top of the filter compartment 24. The bottom sides of the two sets of air inlets 26 on the table panel 2 are all The filter chamber 24 is equipped with an air inlet hopper 27. Two sets of air inlet hoppers 27 are connected to the input end of the air inlet pipe 25 through a pipe. The top opening of the dust filter hopper 30 inside the filter chamber 24 is threadedly inserted into the threaded sleeve 35 at the bottom end of the connecting port 36. A sealing cover 29 is hinged to the top rear side of the filter chamber 24. When the fan 21 is working, the airflow enters the filter chamber 24 through the air inlet 26, air inlet hopper 27, and air inlet pipe 25. After being filtered by the dust filter hopper 30, it is discharged from the air outlet 31 through the filter plate 28, exhaust pipe 22, fan 21, and exhaust pipe 23. The dust remains in the dust filter hopper 30 for collection.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0045] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lifting lectern comprising a stationary box (1), characterized in that: The top side of the fixed box (1) is provided with a table panel (2), and the bottom side of the table panel (2) is fixedly connected with a lifting sleeve (6). The lifting sleeve (6) is slidably connected to the inner wall of the fixed box (1). The bottom side of the table panel (2) is also fixedly connected with a dust cover (7). The dust cover (7) is slidably fitted on the outer surface of the fixed box (1). The bottom side of the inside of the fixed box (1) is equipped with a lifting assembly for driving the table panel (2) to rise and fall. The rear side of the inside of the fixed box (1) is also equipped with a dust filter assembly. The lifting assembly includes a dual-axis motor (11), which is fixedly installed on the bottom inside of the fixed box (1). The left and right output shaft ends of the dual-axis motor (11) are fixedly connected to transmission rods (13). The left and right sides of the two sets of transmission rods (13) are fitted with bearing seats (12). The four sets of bearing seats (12) are fixedly installed on the bottom inside of the fixed box (1). The left and right sides inside the fixed box (1) are also equipped with lifting mechanisms.

2. The lift podium of claim 1, wherein: The lifting mechanism includes two sets of mounting plates (14). Both sets of mounting plates (14) are fixedly welded to the rear inner wall of the fixed box (1). Limiting rods (15) are fixedly connected to the front and rear sides of the two sets of mounting plates (14). A screw (17) is rotatably installed in the middle between the two sets of mounting plates (14). A lifting plate (16) is threaded on the screw (17). The front and rear parts of the lifting plate (16) are slidably sleeved on the two sets of limiting rods (15). A bevel gear (19) is fixedly sleeved on the bottom outer surface of the screw (17) and the end of the transmission rod (13) near the screw (17). The two sets of bevel gears (19) mesh with each other. Support plates (18) are fixedly connected to the left and right sides of the lifting plate (16). The tops of the two sets of support plates (18) are fixedly installed on the bottom side of the platform (2).

3. The lift podium of claim 1, wherein: The dust filtration assembly includes a fan (21). A fixed plate (10) is fixedly connected to the rear side of the interior of the fixed box (1). The fan (21) is fixedly installed on the top side of the fixed plate (10). The input end and output end of the fan (21) are respectively fixedly connected to an exhaust pipe (22) and an exhaust pipe (23). A filter chamber (24) is provided on the rear side of the fixed box (1). The input end of the exhaust pipe (22) is fixedly connected to the middle of the front side of the filter chamber (24). A filter plate (28) is fixedly connected at the connection between the exhaust pipe (22) and the filter chamber (24). An air outlet (31) is opened on the rear side of the fixed box (1). The output end of the exhaust pipe (23) is fixedly connected to the air outlet (31). A dust collection mechanism is provided between the table panel (2) and the filter chamber (24).

4. The lift podium of claim 3, wherein: The dust collection mechanism includes an air inlet pipe (25), which is located inside the rear side of the fixed box (1). The top of the filter chamber (24) is provided with a connecting port (36). The bottom output end of the air inlet pipe (25) is fixedly connected to the connecting port (36). Two sets of air inlets (26) are provided on the table panel (2). The bottom sides of the two sets of air inlets (26) are fixedly connected to air inlet hoppers (27). The bottom output ends of the two sets of air inlet hoppers (27) are fixedly connected to the input end of the air inlet pipe (25) through pipes. A dust collection mechanism is also provided inside the filter chamber (24).

5. The lift podium of claim 4, wherein: The dust collection mechanism includes a dust filter cartridge (30), which is located inside the filter chamber (24). A threaded sleeve (35) is fixedly connected to the bottom end of the communication port (36). The top opening of the dust filter cartridge (30) is threadedly inserted into the threaded sleeve (35), and a sealing cover (29) is hinged to the rear top of the filter chamber (24).

6. The lift podium of claim 1, wherein: The inner wall of the lifting sleeve (6) is fixedly welded with sliding rods (8) at the four corners, and the inner wall of the fixed box (1) is fixedly welded with fixed cylinders (9) at the four corners. The bottom end of the sliding rod (8) slides through the inside of the fixed cylinder (9).

7. The lift podium of claim 2, wherein: A limiting plate (20) is also provided between the lifting plate (16) and the bevel gear (19). The front and rear parts of the limiting plate (20) are respectively fixedly sleeved on two sets of limiting rods (15), and the limiting plate (20) is sleeved on the outside of the screw (17).

8. The lectern of claim 4, wherein: The top of the air inlet (26) is fitted with a filter plate two (33), and the top front and rear sides of the filter plate two (33) are provided with snap-on grooves (34).

9. The lectern of claim 1, wherein: Storage compartments (4) are provided on the left and right sides of the front of the fixed box (1). Cabinet doors (3) are hinged to the front of both sets of storage compartments (4). Several partitions (5) are fixedly connected to the inner wall of one set of storage compartments (4).

10. The lift podium of claim 1, wherein: Several support blocks (32) are fixedly installed at the bottom of the fixed box (1).

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