Electric lifting lectern

Abstract

The utility model belongs to the technical field of teaching equipment, especially electric lifting lectern, including table board A and the symmetrical setting lifting leg of table board A bottom, still include the table board connecting mechanism of setting in the lifting leg top, the table board connecting mechanism includes the connecting seat fixedly connected in the lifting leg top, the surface fixedly connected with the positioning lug of connecting seat, the bottom of table board A is equipped with the positioning recess of cooperation with positioning lug, the surface of connecting seat is provided with first clamping sliding block and second clamping sliding block, the utility model discloses through the prepositioning cooperation of positioning lug and positioning recess, need not manual accurate alignment, and the table board can be completed preliminary positioning, and the installation time is greatly shortened, and two groups of first clamping sliding block and second clamping sliding block are symmetrically distributed, avoid the table board A inclination or connection loose of one side stress result, and the bearing stability of table board is greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of teaching equipment technology, specifically relating to an electric height-adjustable lectern. Background Technology

[0002] The electric height-adjustable lectern is a piece of teaching and office furniture that can flexibly adjust its height. Its core feature is that through precise height adjustment, it helps users improve their working posture. Whether teachers are teaching for long periods of time or office workers are handling tasks, it can avoid the stiffness caused by a fixed height, effectively reduce the pressure on the cervical and lumbar spine and the fatigue caused by long hours of work. At the same time, it supports users to quickly switch between sitting and standing postures, which can meet the needs of sitting to operate a computer and correct documents, as well as adapt to the scenarios of standing to teach and present content, making the working posture more flexible and comfortable. According to the public announcement (CN220587734U), an electric height-adjustable desk lifting transmission mechanism is disclosed. This technology discloses "including a desktop, a base, the base being disposed at the bottom of the desktop, the base having a support part for adjusting the height of the desktop, the support part including a first square tube, a second square tube, the second square tube being sleeved on the outer ring of the first square tube, a transmission component, the transmission component being disposed on the base, the transmission component being used to control the sliding engagement between the first square tube and the second square tube, etc., which has the technical effect of preventing the lead screw from deforming during the movement of the height-adjustable desk." In this existing design, the connection between the tabletop and the lifting legs of the electric height-adjustable lectern relies mainly on bolt fixing or single slot positioning, lacking a guiding and correction structure. During installation, it is necessary to repeatedly align the holes or slots, which is particularly unfriendly to single-person operation and easily leads to "alignment deviation". Users need to spend a lot of time adjusting the position of the tabletop, and may even require multiple people to cooperate, increasing the installation cost. Furthermore, forcibly installing a misaligned tabletop will cause wear on the edges of the positioning holes and slots, reducing the lifespan of the parts. Long-term use may result in loosening. If the alignment deviation is large, it may cause uneven stress on the tabletop, which may lead to tilting or even sudden detachment during later use. Therefore, an electric height-adjustable lectern was designed to solve the above problems. Utility Model Content

[0003] To address the problems mentioned in the background section, this invention provides an electric height-adjustable lectern. Using this device, the pre-positioning of the positioning protrusion and positioning groove eliminates the need for precise manual alignment; lowering the tabletop A completes the initial positioning, significantly reducing installation time. The two sets of first and second locking sliders are symmetrically distributed, preventing tilting or loosening of the tabletop A due to unilateral force, thus greatly improving the load-bearing stability of the tabletop A.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an electric lifting lectern, including a tabletop A, lifting legs symmetrically arranged at the bottom end of the tabletop A, and a tabletop connecting mechanism arranged at the top end of the lifting legs; The tabletop connecting mechanism includes a connecting seat fixedly connected to the top of the lifting leg. A positioning protrusion is fixedly connected to the surface of the connecting seat. A positioning groove cooperating with the positioning protrusion is formed at the bottom of the tabletop A. A first locking slider and a second locking slider are provided on the surface of the connecting seat. A first slider mounting groove and a second slider mounting groove cooperating with the first and second locking sliders are formed on the surface of the connecting seat. A slider guide groove is formed on the surface of the second locking slider, allowing the second locking slider to slide on the surface of the first locking slider via the slider guide groove. A first locking groove and a second locking groove cooperating with the first and second locking sliders are formed at the bottom of the tabletop A. A locking protrusion is fixedly connected to the surface of the first locking slider, and a locking groove cooperating with the locking protrusion is formed on the surface of the second locking slider.

[0005] As a preferred embodiment of the electric lifting lectern of this utility model, both the first and second locking sliders are provided in two sets, with the two sets of the first and second locking sliders symmetrically arranged on both sides of the positioning protrusion.

[0006] As a preferred embodiment of the electric height-adjustable lectern of this utility model, a first return spring is fixedly connected to the surface of the first snap-fit ​​slider, and the other end of the first return spring is fixedly connected to the connecting seat through the first slider mounting groove.

[0007] As a preferred embodiment of the electric lifting lectern of this utility model, the top of the positioning protrusion is provided with a first guide slope, the top of the first locking slider is provided with a second guide slope, and the top of the second locking slider is provided with a third guide slope.

[0008] As a preferred embodiment of the electric lifting lectern of this utility model, it also includes a linkage unlocking mechanism disposed on the surface of the connecting seat; The linkage unlocking mechanism includes a linkage slide plate disposed inside the connecting seat, and the connecting seat has a slide plate guide groove that cooperates with the linkage slide plate inside. The bottom end of the first locking slider is fixedly connected to a linkage slide post. The surface of the linkage slide plate has a slide post linkage groove that cooperates with the linkage slide post, and the surface of the connecting seat has a slide post clearance groove that cooperates with the linkage slide post.

[0009] As a preferred embodiment of the electric lifting lectern of this utility model, the bottom end of the positioning protrusion is fixedly connected to a limiting slide post, and the surface of the linkage slide plate is provided with a limiting straight groove that cooperates with the limiting slide post.

[0010] As a preferred embodiment of the electric lifting lectern of this utility model, the surface of the connecting seat is slidably connected with an unlocking push rod, and the unlocking push rod is fixedly connected to the linkage slide plate.

[0011] As a preferred embodiment of the electric lifting lectern of this utility model, a plurality of second return springs are fixedly connected to one end of the linkage slide away from the unlocking push rod, and the other end of the second return springs is fixedly connected to the connecting seat through the guide groove of the slide.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: A tabletop connecting mechanism is added to this application. Through the pre-positioning cooperation of the positioning protrusion and the positioning groove, no manual precise alignment is required; the initial positioning is completed simply by lowering the tabletop, significantly shortening the installation time. The two sets of first and second locking sliders are symmetrically distributed, avoiding tilting of the tabletop A or loosening of the connection due to unilateral force, greatly improving the load-bearing stability of the tabletop. The first and second locking sliders are linked through the locking protrusion and locking groove, forming a "double insurance" locking structure, which, combined with the continuous pre-tension of the first return spring, provides a secure and reliable locking mechanism. The mechanism effectively prevents table A from detaching due to the failure of a single slider, reducing safety risks. Simultaneously, a linkage unlocking mechanism is incorporated. Through the mechanical linkage between the unlocking push rod and the linkage slide plate, a single press simultaneously drives the retraction and unlocking of both sets of first and second locking sliders, eliminating the need to operate the locking components on both sides separately. This achieves one-click release and installation, improving the disassembly efficiency of the equipment. During the unlocking process, the linkage slide plate ensures synchronous movement of the two sliders through the sliding column linkage groove and linkage sliding column, avoiding uneven force on table A caused by single-sided unlocking, reducing component friction wear, and extending the service life of the mechanism. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall design of this utility model; Figure 2 This is a schematic diagram of the lifting leg in this utility model; Figure 3 This is a schematic diagram of the structure of the first snap-fit ​​slider in this utility model; Figure 4 This is a schematic diagram of the structure of the second snap-fit ​​slider in this utility model; Figure 5 This is a schematic diagram of the linkage sliding plate in this utility model; Figure 6 This is a schematic diagram of the unlocking push rod in this utility model; In the picture: 1. Tabletop A; 11. Adjustable legs; 2. Tabletop connecting mechanism; 21. Connecting seat; 22. Positioning protrusion; 23. Positioning groove; 24. First snap-fit ​​slider; 25. First slider mounting groove; 26. Second snap-fit ​​slider; 27. Second slider mounting groove; 28. Slider guide groove; 29. ​​First snap-fit ​​groove; 210. Second snap-fit ​​groove; 211. First return spring; 212. First guide slope; 213. Second guide slope; 214. Third guide slope; 215. Snap-fit ​​protrusion; 216. Snap-fit ​​groove; 3. Linkage unlocking mechanism; 31. Linkage skateboard; 32. Skateboard guide groove; 33. Linkage slide column; 34. Slide column linkage groove; 35. Slide column clearance groove; 36. Limiting slide column; 37. Limiting straight groove; 38. Unlocking push rod; 39. Second reset spring. Detailed Implementation

[0014] 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.

[0015] Example 1 like Figure 1 As shown; An electric height-adjustable lectern includes a tabletop A1 and height-adjustable legs 11 symmetrically arranged at the bottom of the tabletop A1.

[0016] In this implementation plan: In the prior art, the height adjustment of the tabletop is accomplished using lifting legs 11. For the specific working principle of the lifting legs 11, please refer to the technology disclosed in "CN220587734U discloses a lifting transmission mechanism for an electric lifting desk." This technology discloses that "during the process of adjusting the tabletop height, the lead screw in the transmission assembly is subjected to force at two points: through the adjusting block and the increasing balance block, thereby preventing the upper end of the lead screw from bending." However, in this prior art design, the connection between the tabletop and the lifting legs of the electric lifting lectern mostly relies on bolt fixing or a single slot positioning, lacking a guiding and corrective structure, requiring reverse installation. Aligning the holes or slots is particularly unfriendly for single-person operation, easily leading to "alignment deviations." Users need to spend a lot of time adjusting the tabletop position, and may even require multiple people to cooperate, increasing installation costs. Furthermore, forcibly installing a misaligned tabletop will cause wear on the edges of the positioning holes and slots, reducing the lifespan of the parts and potentially causing loosening over time. If the alignment deviation is large, it may lead to uneven stress on the tabletop, making it prone to tilting or even sudden detachment during later use. Considering the usage, this problem is clearly a real and difficult-to-solve issue. Therefore, to solve this technical problem, a tabletop connecting mechanism 2 and a linkage unlocking mechanism 3 are added to this application.

[0017] Furthermore: This application incorporates the aforementioned prior art, such as Figures 1 to 6 As shown: In conjunction with the above: an electric height-adjustable lectern further includes a tabletop connecting mechanism 2 disposed at the top of the height-adjustable leg 11; The tabletop connecting mechanism 2 includes a connecting seat 21 fixedly connected to the top of the lifting leg 11. A positioning protrusion 22 is fixedly connected to the surface of the connecting seat 21. A positioning groove 23 that mates with the positioning protrusion 22 is provided at the bottom of the tabletop A1. A first locking slider 24 and a second locking slider 26 are provided on the surface of the connecting seat 21. A first slider mounting groove 25 and a second slider mounting groove 27 that mate with the first locking slider 24 and the second locking slider 26 are provided on the surface of the connecting seat 21. A slider guide groove 28 is provided on the surface of the second locking slider 26. The second locking slider 26 slides on the surface of the first locking slider 24 through the slider guide groove 28. A first locking groove 29 and a second locking groove 210 that mate with the first locking slider 24 and the second locking slider 26 are provided at the bottom of the tabletop A1. A locking protrusion 215 is fixedly connected to the surface of the first locking slider 24. A locking groove 216 that mates with the locking protrusion 215 is provided on the surface of the second locking slider 26.

[0018] In this implementation scheme: the positioning groove 23 at the bottom of the tabletop A1 is aligned with the positioning protrusion 22 on the surface of the connecting seat 21. The initial positioning of the tabletop A1 and the lifting leg 11 is achieved through their engagement, ensuring accurate installation direction. When the tabletop A1 is in place, the first locking slider 24 is pushed by external force to slide along the first slider mounting groove 25 on the surface of the connecting seat 21 towards the positioning protrusion 22 until it is engaged in the first locking groove 29 of the tabletop A1. At the same time, because the locking protrusion 215 of the first locking slider 24 is embedded in the locking groove 216 of the second locking slider 26, the movement of the first locking slider 24 drives the second locking slider 26 to slide on the surface of the first locking slider 24 through the slider guide groove 28. This causes the second locking slider 26 to slide upward along the second slider mounting groove 27 on the surface of the connecting seat 21 until it is engaged in the second locking groove 210 of the tabletop A1, forming a double locking structure. This achieves rapid positioning and stable connection between the tabletop A1 and the lifting leg 11, improving connection reliability.

[0019] Furthermore: like Figures 3 to 6 As shown: In an optional embodiment, two sets of the first snap-fit ​​slider 24 and the second snap-fit ​​slider 26 are provided, and the two sets of the first snap-fit ​​slider 24 and the second snap-fit ​​slider 26 are symmetrically arranged on both sides of the positioning protrusion 22.

[0020] In this embodiment, two sets of first locking sliders 24 and second locking sliders 26 are symmetrically distributed on both sides of the positioning protrusion 22, so that the bottom of the table A1 is subjected to balanced force on both sides, avoiding the tilting of the table A or loosening of the connection caused by unilateral force, and improving the load-bearing stability of the overall structure.

[0021] Furthermore: like Figure 3 As shown: In an optional embodiment, a first return spring 211 is fixedly connected to the surface of the first snap-fit ​​slider 24, and the other end of the first return spring 211 is fixedly connected to the connecting seat 21 through the first slider mounting groove 25.

[0022] In this embodiment: one end of the first return spring 211 is fixed to the surface of the first snap-fit ​​slider 24, and the other end is fixed to the connecting seat 21 through the first slider mounting groove 25. When an external force pushes the first snap-fit ​​slider 24 to slide away from the positioning protrusion 22, the first return spring 211 is compressed and stores elastic potential energy. When the table A1 is in place and the first snap-fit ​​groove 29 is aligned with the first snap-fit ​​slider 24, the first return spring 211 releases its potential energy, pushing the first snap-fit ​​slider 24 to automatically reset and snap into the first snap-fit ​​groove 29. At the same time, the first return spring 211 continuously provides preload force to ensure a stable snap-fit ​​state.

[0023] Furthermore: like Figure 4 and Figure 6 As shown: In an optional embodiment, the top of the positioning protrusion 22 is provided with a first guide slope 212, the top of the first snap-fit ​​slider 24 is provided with a second guide slope 213, and the top of the second snap-fit ​​slider 26 is provided with a third guide slope 214.

[0024] In this embodiment: the first guide slope 212 at the top of the positioning protrusion 22, the second guide slope 213 at the top of the first snap-fit ​​slider 24, and the third guide slope 214 at the top of the second snap-fit ​​slider 26 play a guiding role when the table A1 is installed. During the installation process of the table A1, its bottom end first contacts the first guide slope 212, and the alignment deviation between the positioning groove 23 and the positioning protrusion 22 is automatically corrected by the sliding of the slope. Subsequently, the bottom end of the table A1 contacts the second guide slope 213 and the third guide slope 214 respectively. The guiding thrust of the slope forces the first snap-fit ​​slider 24 and the second snap-fit ​​slider 26 to accurately snap into the first snap-fit ​​groove 29 and the second snap-fit ​​groove 210.

[0025] Furthermore: like Figure 3 and Figure 5 As shown: In an optional embodiment, a linkage unlocking mechanism 3 is also provided on the surface of the connector 21; The linkage unlocking mechanism 3 includes a linkage slide plate 31 disposed inside the connecting base 21, and the connecting base 21 has a slide plate guide groove 32 that cooperates with the linkage slide plate 31. The bottom end of the first locking slider 24 is fixedly connected to a linkage slide post 33. The surface of the linkage slide plate 31 has a slide post linkage groove 34 that cooperates with the linkage slide post 33, and the surface of the connecting base 21 has a slide post clearance groove 35 that cooperates with the linkage slide post 33.

[0026] In this implementation scheme: the linkage unlocking mechanism 3 is used to simultaneously release the locking state of the two sets of first locking sliders 24 and second locking sliders 26. When the linkage slide plate 31 is pushed to slide along the slide plate guide groove 32, the sliding column linkage groove 34 on the surface of the linkage slide plate 31 will drive the linkage sliding column 33 at the bottom of the first locking slider 24 to move. The linkage sliding column 33 slides along the sliding column clearance groove 35, thereby forcing the first locking slider 24 to compress the first reset spring 211 and retract inward, disengaging from the first locking groove 29. Since the second locking slider 26 is linked with the first locking slider 24 through the locking protrusion 215, when the first locking slider 24 retracts, it will simultaneously drive the second locking slider 26 to disengage from the second locking groove 210, thus achieving double unlocking.

[0027] Furthermore: like Figure 5 As shown: In an optional embodiment, the bottom end of the positioning protrusion 22 is fixedly connected to the limiting slide post 36, and the surface of the linkage slide plate 31 is provided with a limiting straight groove 37 that cooperates with the limiting slide post 36.

[0028] In this embodiment: the limiting slide post 36 at the bottom of the positioning protrusion 22 is embedded in the limiting straight groove 37 of the linkage slide plate 31. When the linkage slide plate 31 slides along the slide plate guide groove 32, the limiting slide post 36 moves synchronously along the limiting straight groove 37, constraining the linkage slide plate 31 to only make linear movements, preventing deviation or rotation.

[0029] Furthermore: like Figure 6 As shown: In an optional embodiment, an unlocking push rod 38 is slidably connected to the surface of the connecting seat 21, and the unlocking push rod 38 is fixedly connected to the linkage slide plate 31.

[0030] In this embodiment: the unlocking push rod 38 is fixedly connected to the linkage slide plate 31. When the unlocking push rod 38 is pushed, the thrust is directly transmitted to the linkage slide plate 31, driving it to slide along the slide plate guide groove 32 and triggering the unlocking action.

[0031] Furthermore: like Figure 3 As shown: In an optional embodiment, a plurality of second return springs 39 are fixedly connected to one end of the linkage slide plate 31 away from the unlocking push rod 38, and the other end of the second return springs 39 is fixedly connected to the connecting seat 21 through the slide plate guide groove 32.

[0032] In this embodiment: one end of the second reset spring 39 is fixed to the end of the linkage slide plate 31 away from the unlocking push rod 38, and the other end is fixed to the connecting seat 21 through the slide plate guide groove 32. When the unlocking push rod 38 is pushed, the linkage slide plate 31 compresses the second reset spring 39 and stores elastic potential energy. After the unlocking push rod 38 is released, the second reset spring 39 releases its potential energy, pushing the linkage slide plate 31 to automatically reset, thereby driving the double slider to re-engage into the first locking groove 29 and the second locking groove 210, realizing the automatic reset of the unlocking mechanism, ensuring that the slider quickly returns to the locked state after unlocking, avoiding the loosening of the table A connection due to forgetting to manually reset, and improving structural safety.

[0033] Working principle: Pressing the unlocking push rod 38 on the surface of the connecting seat 21, the pushing force is transmitted through the unlocking push rod 38 to the linkage slide plate 31 fixedly connected to it, forcing the linkage slide plate 31 to slide away from the unlocking push rod 38 along the slide plate guide groove 32. The limiting slide post 36 at the bottom of the positioning protrusion 22 slides synchronously along the limiting straight groove 37 on the surface of the linkage slide plate 31, constraining the linkage slide plate 31 to only make linear motion and preventing deviation. The linkage slide plate 31 compresses the second return spring 39, making it store elastic potential energy. When the linkage slide plate 31 slides, the slide post linkage groove 34 on its surface pushes the linkage slide post 33 at the bottom of the first locking slider 24 to move. The linkage slide post 33 slides along the slide post clearance groove 35 of the connecting seat 21, thereby forcing the linkage slide plate 31 to slide away from the unlocking push rod 38. The first locking slider 24 slides away from the positioning protrusion 22 along the first slider mounting groove 25, compressing the first return spring 211 to store elastic potential energy. Because the locking protrusion 215 on the surface of the first locking slider 24 is embedded in the locking groove 216 of the second locking slider 26, the sliding of the first locking slider 24 synchronously drives the second locking slider 26 to slide along the second slider mounting groove 27 towards the inside of the connecting seat 21. The second locking slider 26 also slides synchronously on the surface of the first locking slider 24 through the slider guide groove 28. Finally, the first locking slider 24 and the second locking slider 26 disengage from their initial locking state, making room for the installation of the tabletop A1. Maintaining the pressed unlocking push rod 38, the bottom of the tabletop A1 is... Align the positioning groove 23 at the end with the positioning protrusion 22 on the surface of the connecting seat 21, and slowly lower the table plate A1. The bottom end of the table plate A1 first contacts the first guide slope 212 at the top of the positioning protrusion 22. The alignment deviation between the positioning groove 23 and the positioning protrusion 22 is automatically corrected by the sliding of the slope to ensure precise engagement. Continue lowering the table plate A1 until the positioning protrusion 22 is fully embedded in the positioning groove 23. The table plate A1 completes the initial positioning. At this time, the bottom end of the table plate A1 is in contact with the surface of the connecting seat 21, and the first locking groove 29 of the table plate A1 is aligned with the first locking slider 24, and the second locking groove 210 is aligned with the second locking slider 26. Release the unlocking push rod 38. At this time, the second return spring 39 releases its elastic potential energy and pushes the connecting seat 21. The movable slide plate 31 slides in the opposite direction along the slide plate guide groove 32 toward the unlocking push rod 38. The linkage slide plate 31 drives the linkage slide column 33 to reset through the slide column linkage groove 34, releasing the pushing force on the first locking slider 24. The first reset spring 211 releases elastic potential energy, pushing the first locking slider 24 to slide in the opposite direction along the first slider mounting groove 25 toward the positioning protrusion 22, and lock into the first locking groove 29 of the tabletop A1. When the first locking slider 24 slides, it drives the second locking slider 26 to slide along the slider guide groove 28 through the locking protrusion 215, so that the second locking slider 26 slides in the opposite direction along the second slider mounting groove 27 and locks into the second locking groove 210 of the tabletop A1, completing the quick installation of the tabletop A1.

[0034] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An electric height-adjustable lectern, comprising a tabletop A (1) and height-adjustable legs (11) symmetrically arranged at the bottom end of the tabletop A (1), characterized in that: It also includes a tabletop connecting mechanism (2) located at the top of the lifting leg (11); The tabletop connecting mechanism (2) includes a connecting seat (21) fixedly connected to the top of the lifting leg (11). A positioning protrusion (22) is fixedly connected to the surface of the connecting seat (21). A positioning groove (23) that mates with the positioning protrusion (22) is provided at the bottom of the tabletop A (1). A first locking slider (24) and a second locking slider (26) are provided on the surface of the connecting seat (21). A first slider mounting groove (25) and a second slider mounting groove (27) that mate with the first locking slider (24) and the second locking slider (26) are provided on the surface of the connecting seat (21). The surface of the second snap-fit ​​slider (26) is provided with a slider guide groove (28). The second snap-fit ​​slider (26) slides on the surface of the first snap-fit ​​slider (24) through the slider guide groove (28). The bottom end of the table A (1) is provided with a first snap-fit ​​groove (29) and a second snap-fit ​​groove (210) that cooperate with the first snap-fit ​​slider (24) and the second snap-fit ​​slider (26). The surface of the first snap-fit ​​slider (24) is fixedly connected with a snap-fit ​​protrusion (215). The surface of the second snap-fit ​​slider (26) is provided with a snap-fit ​​groove (216) that cooperates with the snap-fit ​​protrusion (215).

2. The electric height-adjustable lectern according to claim 1, characterized in that: The first snap-fit ​​slider (24) and the second snap-fit ​​slider (26) are provided in two sets, and the two sets of the first snap-fit ​​slider (24) and the second snap-fit ​​slider (26) are symmetrically arranged on both sides of the positioning protrusion (22).

3. The electric height-adjustable lectern according to claim 1, characterized in that: A first return spring (211) is fixedly connected to the surface of the first snap-fit ​​slider (24), and the other end of the first return spring (211) is fixedly connected to the connecting seat (21) through the first slider mounting groove (25).

4. The electric height-adjustable lectern according to claim 1, characterized in that: The top of the positioning protrusion (22) is provided with a first guide slope (212), the top of the first snap-fit ​​slider (24) is provided with a second guide slope (213), and the top of the second snap-fit ​​slider (26) is provided with a third guide slope (214).

5. The electric height-adjustable lectern according to claim 1, characterized in that: It also includes a linkage unlocking mechanism (3) disposed on the surface of the connector (21); The linkage unlocking mechanism (3) includes a linkage slide plate (31) disposed inside the connecting seat (21), and the connecting seat (21) has a slide plate guide groove (32) that cooperates with the linkage slide plate (31). The bottom end of the first locking slider (24) is fixedly connected to a linkage slide post (33). The surface of the linkage slide plate (31) has a slide post linkage groove (34) that cooperates with the linkage slide post (33), and the surface of the connecting seat (21) has a slide post clearance groove (35) that cooperates with the linkage slide post (33).

6. The electric height-adjustable lectern according to claim 5, characterized in that: The bottom end of the positioning protrusion (22) is fixedly connected to the limiting slide post (36), and the surface of the linkage slide plate (31) is provided with a limiting straight groove (37) that cooperates with the limiting slide post (36).

7. The electric height-adjustable lectern according to claim 6, characterized in that: The surface of the connecting seat (21) is slidably connected to an unlocking push rod (38), and the unlocking push rod (38) is fixedly connected to the linkage slide plate (31).

8. The electric height-adjustable lectern according to claim 7, characterized in that: A plurality of second return springs (39) are fixedly connected to one end of the linkage slide plate (31) away from the unlocking push rod (38), and the other end of the second return springs (39) is fixedly connected to the connecting seat (21) through the slide plate guide groove (32).

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