A highly adjustable sign

Abstract

The application discloses a highly adjustable signboard and relates to the technical field of electronic information signboards.The signboard comprises a base, a mounting hole is formed in the top of the base, an electric driving lifting rod is fixedly installed in the mounting hole, a control module is arranged in the electric driving lifting rod, the control module is used for receiving remote instructions to start and stop the electric driving lifting rod, a connecting block is fixedly installed on the output end of the electric driving lifting rod, a sleeve rod is fixedly installed on the top of the connecting block, the electric driving lifting rod is used for driving the connecting block to drive the sleeve rod to ascend and descend along the vertical direction, and the signboard further comprises a shaft sleeve which is fixedly installed on the circumferential surface of the sleeve rod.Through the gravity sharing design of the supporting ring, the output end of the electric driving lifting rod does not need to continuously bear the whole gravity when waiting, thereby reducing the frequency of fault maintenance and prolonging the service life of the electric driving lifting rod.

Description

Technical Field

[0001] This invention relates to the field of electronic information signage technology, specifically to a height-adjustable signage. Background Technology

[0002] The signage in the exhibition hall is an important link connecting space, information and visitors. It has multiple functions such as wayfinding, instruction, public display, interpretation and warning. Its design and layout directly affect the smoothness and experience of visiting the exhibition.

[0003] Patent publication number CN113236931B relates to a height-adjustable electronic information sign, belonging to the field of electronic information sign technology. It includes a stabilizing base, the top of which is connected to the electronic information sign body via a height adjustment device. In this patent, the length of an electro-hydraulic telescopic rod is controlled by a controller to adjust the position of a slider. The slider moves left and right to adjust the tilt angle of a connecting rod. By adjusting the tilt angle of the connecting rod, the height of the electronic information sign body is adjusted. This solves the problem that the height of the existing electronic information sign body is limited by the length of the motor shaft of the push rod motor. Furthermore, the pushing power of the electro-hydraulic telescopic rod is less than the power of the push rod motor used in existing height-adjustable electronic information signs, reducing equipment costs. In addition, the height-adjustable electronic information sign has a smaller volume when retracted, facilitating transportation.

[0004] The aforementioned patent has the function of adjusting the height of the electronic information sign body, which solves the problem that the height of the existing electronic information sign body is limited by the length of the motor shaft of the push rod motor. However, in actual use, the output end of the electric hydraulic telescopic rod needs to bear the entire weight of the sign body for a long time. This design will accelerate the wear and tear of the telescopic rod, shorten its service life, and thus reduce the overall operational reliability of the electronic information sign body. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the present invention provides a height-adjustable sign, which solves the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a height-adjustable signboard, comprising a base, a mounting hole at the top of the base, an electrically driven lifting rod fixedly mounted within the mounting hole, a control module internally configured within the electrically driven lifting rod, the control module being used to receive remote commands to start and stop the electrically driven lifting rod, a connecting block fixedly mounted on the output end of the electrically driven lifting rod, a sleeve rod fixedly mounted on the top of the connecting block, the electrically driven lifting rod being used to drive the connecting block to move the sleeve rod vertically up and down, and activating the electrically driven lifting rod, the output end of the electrically driven lifting rod driving the connecting block. The rising mechanism, which involves the connecting block synchronously driving the sleeve rod upwards, also includes: a bushing, which is fixedly installed on the circumferential surface of the sleeve rod; a rectangular housing, which is fixedly installed on the circumferential surface of the bushing, and the outer wall of the rectangular housing has an assembly groove; an electronic display screen, which is fixedly installed inside the rectangular housing and is used to display electronic identification content; a support ring, which is fixedly installed on the top of the base; and a circular ring plate, which is fixedly installed on the bottom of the sleeve rod, and the support ring is used to support the circular ring plate. During the rising process, the sleeve rod will synchronously drive the bushing and the circular ring plate to rise together.

[0007] According to the above technical solution, the inner wall of the sleeve rod slides and fits against the circumferential surface of the electric drive lifting rod. The circumferential surface of the electric drive lifting rod is used to guide the sleeve rod. The output end of the electric drive lifting rod will drive the connecting block and the sleeve rod to rise smoothly in the vertical direction.

[0008] According to the above technical solution, a circular tube is rotatably mounted on the circumferential surface of the sleeve rod, and a mounting plate is fixedly mounted on the circumferential surface of the circular tube. A mounting groove is formed on the outer wall of the mounting plate, and a writing board is set in the mounting groove. A rectangular groove is formed on the surface of the writing board. When a finger passes through the rectangular groove and contacts the inner wall of the writing board, and then a pulling force is applied outward, the pulling force drives the writing board to move away from the mounting plate. The writing board is used to write text markings.

[0009] According to the above technical solution, the outer wall of the mounting plate is provided with a sealing strip, the surface of the writing board is provided with a circular hole, and a rubber rod is fixedly installed in the rectangular groove of the mounting plate. The circumferential surface of the rubber rod and the inner wall of the circular hole are tightly fitted, and the rubber rod will apply a reaction force to the inner wall of the circular hole to provide stable support for the writing board.

[0010] According to the above technical solution, the mounting plate is provided with an angle locking device for angle positioning, and the rectangular shell is provided with a safety protection device for safe operation. The angle locking device includes a connecting plate, a hollow tube, a fixing block, a long rod, a handle, and a limiting block. Pulling the handle upward causes the long rod to move upward along the through hole of the fixing block. The connecting plate is fixedly installed on the circumferential surface of the bushing. The hollow tube is fixedly inserted through the surface of the connecting plate. The fixing block is fixedly installed on the outer wall of the mounting plate. The surface of the fixing block has a through hole. The long rod is slidably installed in the through hole. The handle is fixedly installed on the top of the long rod. The limiting block is fixedly installed on the outer wall of the mounting plate. The circumferential surface of the long rod is tightly fitted with the inner wall of the hollow tube.

[0011] According to the above technical solution, a blind hole is provided at the top of the limiting block, and the bottom of the long rod is closely fitted with the inner wall of the blind hole. During the upward movement, the long rod disengages from the blind hole of the limiting block.

[0012] According to the above technical solution, the safety protection device includes a sliding frame, a rectangular plate, a convex plate, a connecting rod, and an elastic buckle. The long rod contacts the edge of the elastic buckle and applies lateral pressure, forcing the elastic buckle to undergo elastic deformation towards the convex plate. The sliding frame is fixedly installed in the assembly groove, the rectangular plate is disposed in the sliding frame, the convex plate is fixedly installed on the outer wall of the rectangular plate, the connecting rod is fixedly installed on the side of the convex plate away from the rectangular plate, and the elastic buckle is fixedly installed on the end of the connecting rod away from the convex plate.

[0013] According to the above technical solution, an elastic friction plate is fixedly installed on the top of the rectangular plate. The elastic friction plate is in close contact with the inner wall of the slide frame, and friction is generated between the elastic friction plate and the inner wall of the slide frame. A pull ring plate is fixedly installed on the top of the elastic friction plate.

[0014] This invention provides a height-adjustable sign. It has the following advantages: (1) When the bushing rises, the rectangular shell will be driven, and when the round tube rises, the mounting plate will be driven. By precisely adjusting the height of the electronic display screen and the writing board, the content of the sign and the exhibits will be visually aligned. This can not only flexibly match exhibits of different heights, but also make the content of the sign clear and convenient for visitors to quickly obtain relevant information about the exhibits through the sign. At the same time, the support ring provides stable support for the circular plate. Through the gravity distribution design of the support ring, the output end of the electric drive lifting rod does not need to bear the full gravity continuously when in standby, thereby reducing the frequency of fault repair and extending the service life of the electric drive lifting rod.

[0015] (2) The height-adjustable sign applies an outward pulling force, which drives the writing board to move away from the mounting plate. Through the deformation of the rubber rod after being squeezed, the writing board can be easily disassembled and can also be effectively prevented from falling off during use or height adjustment, thus ensuring the reliability of the text sign display.

[0016] (3) When the height-adjustable sign is rotated to the preset position, the sealing strip on its outer wall is tightly fitted with the outer wall of the rectangular shell. The fixed constraint of the sign can be quickly released by pulling up the handle, and then rotated to fit the rectangular shell, which strengthens the protection of the electronic display screen and isolates dust, moisture and external force collisions in the air. At the same time, the long rod is tightly fitted with the inner wall of the hollow tube to fix the placement angle of the sign. The double limiting structure of the long rod passing through the hollow tube and embedded in the blind hole achieves stable fixation of the angle of the sign, ensuring that the sign will not deflect during the display and ensuring that the sign content is conveyed normally.

[0017] (4) The height-adjustable sign has elastic buckles that tightly wrap around the circumference of the long rod, enhancing the stability of the long rod. The wrapping fixation of the elastic buckles keeps the long rod stable in the designated position, preventing the mounting plate from shifting due to slight vibration in the standby state, thus better protecting the electronic display screen. At the same time, the elastic friction plate forms a tight fit with the inner wall of the slide frame. The convenient replacement of the elastic buckles further improves the overall operation and maintenance efficiency, reduces downtime, and ensures the stability of the rectangular plate installation with the elastic friction plate. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the connecting block position structure of the present invention; Figure 3 This is a schematic diagram of the internal structure of the fixing block and the limiting block of the present invention; Figure 4 This is a schematic diagram of the connecting plate and rubber rod structure of the present invention; Figure 5 This is a schematic diagram of the internal structure of the writing board of the present invention; Figure 6 This is a schematic diagram of the positional structure of the hollow tube and the long rod of the present invention; Figure 7 This is a schematic diagram of the structure of the mounting plate of the present invention rotating to a preset position; Figure 8 This is a schematic diagram of the overall structure of the elastic buckle of the present invention.

[0019] In the diagram: 1. Base; 2. Electric-driven lifting rod; 3. Connecting block; 4. Sleeve rod; 5. Bushing; 6. Rectangular housing; 7. Electronic display screen; 8. Support ring; 9. Circular ring plate; 10. Circular tube; 11. Mounting plate; 12. Writing board; 13. Rubber rod; 21. Connecting plate; 22. Hollow tube; 23. Fixing block; 24. Long rod; 25. Handle; 26. Limiting block; 31. Sliding groove frame; 32. Rectangular plate; 33. Protruding plate; 34. Connecting rod; 35. Elastic buckle; 36. Elastic friction plate; 37. Pull ring plate. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figure 1 - Figure 8 One embodiment of the present invention is: a height-adjustable sign, including a base 1, a mounting hole on the top of the base 1, an electrically driven lifting rod 2 fixedly installed in the mounting hole, a control module inside the electrically driven lifting rod 2, the control module being used to receive remote commands to start and stop the electrically driven lifting rod 2, a connecting block 3 fixedly installed on the output end of the electrically driven lifting rod 2, a sleeve rod 4 fixedly installed on the top of the connecting block 3, the electrically driven lifting rod 2 being used to drive the connecting block 3 to move the sleeve rod 4 vertically up and down, and also including: a bushing 5, the bushing 5 being fixedly installed on the circumferential surface of the sleeve rod 4; a rectangular... A rectangular housing 6 is fixedly installed on the circumferential surface of the bushing 5, and an assembly groove is provided on the outer wall of the rectangular housing 6; an electronic display screen 7 is fixedly installed inside the rectangular housing 6 and is used to display electronic identification content; a support ring 8 is fixedly installed on the top of the base 1; a circular ring plate 9 is fixedly installed on the bottom of the sleeve rod 4, and the support ring 8 is used to support the circular ring plate 9. Through the gravity distribution design of the support ring 8, the output end of the electric drive lifting rod 2 does not need to continuously bear the full gravity when in standby mode, thereby reducing the frequency of fault maintenance.

[0022] The inner wall of the sleeve rod 4 slides against the circumferential surface of the electrically driven lifting rod 2. The circumferential surface of the electrically driven lifting rod 2 serves as a guide for the sleeve rod 4. Through the sliding contact of the sleeve rod 4, the stability during driving and lifting is effectively improved.

[0023] A circular tube 10 is rotatably mounted on the circumferential surface of the sleeve rod 4. A mounting plate 11 is fixedly mounted on the circumferential surface of the circular tube 10. A mounting groove is provided on the outer wall of the mounting plate 11. A writing board 12 is provided in the mounting groove. A rectangular groove is provided on the surface of the writing board 12. The writing board 12 is used to write text labels. By precisely adjusting the height of the electronic display screen 7 and the writing board 12, the label content and the exhibit are visually aligned, so that the label content is clearly presented.

[0024] The outer wall of the mounting plate 11 is provided with a sealing strip, and the surface of the writing board 12 is provided with a round hole. A rubber rod 13 is fixedly installed in the rectangular groove of the mounting plate 11. The circumferential surface of the rubber rod 13 and the inner wall of the round hole are tightly fitted. Through the deformation of the rubber rod 13 after being squeezed, the writing board 12 can be easily disassembled, and it can also effectively prevent it from accidentally falling off during use or height adjustment, thus ensuring the reliability of the text label display.

[0025] In this embodiment, when the staff first places the base 1 stably in front of the exhibit, then starts the electric drive lifting rod 2. The output end of the electric drive lifting rod 2 will drive the connecting block 3 to rise steadily in the vertical direction. The connecting block 3 will simultaneously drive the sleeve rod 4 to rise. The sleeve rod 4 will move together with the linkage bushing 5, the ring plate 9 and the round tube 10 to rise. When the bushing 5 rises, it will drive the rectangular housing 6, which in turn will drive the electronic display screen 7 to rise synchronously; when the round tube 10 rises, it will drive the mounting plate 11, which in turn will drive the writing board 12 and the rubber rod 13 to rise synchronously. When the boom 4 rises to the preset height, the electric-driven lifting boom 2 automatically stops, and the height adjustment of the electronic display screen 7 and the writing board 12 is completed. After the adjustment is completed, the staff turns on the electronic display screen 7 to play the electronic signs, and at the same time uses a marker to write the relevant text signs of the exhibits on the writing board 12 to complete the signage display. By precisely adjusting the height of the electronic display screen 7 and the writing board 12, the signage content and the exhibits are visually aligned. This not only flexibly accommodates exhibits of different heights, but also ensures that the signage content is clearly presented, making it convenient for visitors to quickly obtain relevant information about the exhibits through the signs. When replacing the writing board 12, the staff first inserts their fingers through the rectangular groove and contacts the inner wall of the writing board 12, and then applies a pulling force outward. This pulling force causes the writing board 12 to move away from the mounting plate 11. During the displacement, the round hole of the writing board 12 first separates from the rubber rod 13, and then the whole thing separates from the mounting groove of the mounting plate 11, completing the disassembly operation. When installing a new writing board 12, first align the round hole of the writing board 12 with the rubber rod 13, and then control the writing board 12 to move into the mounting slot for installation. During the installation process, the round hole first contacts the rubber rod 13. As the writing board 12 gradually gets closer to the mounting slot, the round hole will squeeze the elastic layer of the rubber rod 13, forcing the rubber rod 13 to undergo elastic deformation. The deformed rubber rod 13 will exert a reaction force on the inner wall of the round hole, providing stable support for the writing board 12. After the writing board 12 is completely attached to the mounting slot, the replacement is completed in one go. Through the deformation of the rubber rod 13 after being squeezed, the writing board 12 can be easily disassembled, and it can also effectively prevent it from accidentally falling off during use or height adjustment, ensuring the reliability of the text label display. After the exhibits are displayed for one day, staff will activate the electric-driven lifting rod 2. Its output end will drive the connecting block 3 to descend smoothly in the vertical direction. The connecting block 3 will simultaneously drive the sleeve rod 4 to descend, and the sleeve rod 4 will then drive the annular plate 9 to descend together. When the connecting block 3 descends to the lowest preset position with the conveying end of the electric-driven lifting rod 2, the electric-driven lifting rod 2 will automatically stop running. At the same time, the annular plate 9 will be tightly attached to the support ring 8 and stop moving. The support ring 8 provides stable support for the annular plate 9, which can effectively share the gravity load that the sleeve rod 4 applies to the output end of the electric-driven lifting rod 2 through the connecting block 3 in the standby state, avoiding it from bearing the full weight for a long time. Through the gravity sharing design of the support ring 8, the output end of the electric-driven lifting rod 2 does not need to continuously bear the full weight in the standby state, thereby reducing the frequency of failure maintenance and extending the service life of the electric-driven lifting rod 2.

[0026] Please see Figure 1 - Figure 8 In another embodiment of the present invention, based on the above embodiments, an angle locking device for angle positioning is provided on the mounting plate 11, and a safety protection device for safe operation is provided on the rectangular housing 6. The angle locking device includes a connecting plate 21, a hollow tube 22, a fixing block 23, a long rod 24, a handle 25, and a limiting block 26. The connecting plate 21 is fixedly installed on the circumferential surface of the bushing 5, the hollow tube 22 is fixedly inserted through the surface of the connecting plate 21, the fixing block 23 is fixedly installed on the outer wall of the mounting plate 11, and a through hole is opened on the surface of the fixing block 23. The long rod 24 is slidably installed in the through hole, the handle 25 is fixedly installed on the top of the long rod 24, and the limiting block 26 is fixedly installed on the outer wall of the mounting plate 11. The circumferential surface of the long rod 24 is tightly fitted with the inner wall of the hollow tube 22. By pulling up the handle 25, the fixing constraint of the mounting plate 11 is quickly released, and then it is rotated to fit the rectangular housing 6, thereby strengthening the protection of the electronic display screen 7.

[0027] The top of the limiting block 26 has a blind hole, and the bottom of the long rod 24 fits tightly against the inner wall of the blind hole. Through the double limiting structure of the long rod 24 passing through the hollow tube 22 and embedding into the blind hole, the angle of the mounting plate 11 is stably fixed, ensuring that the mounting plate 11 will not deflect during the display.

[0028] The safety protection device includes a slide frame 31, a rectangular plate 32, a protruding plate 33, a connecting rod 34, and an elastic buckle 35. The slide frame 31 is fixedly installed in the assembly slot, the rectangular plate 32 is set in the slide frame 31, the protruding plate 33 is fixedly installed on the outer wall of the rectangular plate 32, the connecting rod 34 is fixedly installed on the side of the protruding plate 33 away from the rectangular plate 32, and the elastic buckle 35 is fixedly installed on the end of the connecting rod 34 away from the protruding plate 33. Through the wrapping fixation of the elastic buckle 35, the long rod 24 is kept stable in the designated position, preventing the mounting plate 11 from shifting due to slight vibration in the standby state.

[0029] An elastic friction plate 36 is fixedly installed on the top of the rectangular plate 32. The elastic friction plate 36 is tightly fitted to the inner wall of the slide frame 31. A pull ring plate 37 is fixedly installed on the top of the elastic friction plate 36. The convenient replacement of the elastic buckle 35 further improves the efficiency of overall operation and maintenance, reduces downtime, and ensures the stability of the rectangular plate 32 installation with the elastic friction plate 36.

[0030] In this embodiment, after the output end of the electrically driven lifting rod 2 is lowered to the lowest position and enters standby mode, the operator pulls the handle 25 upward. The handle 25 drives the long rod 24 to move upward along the through hole of the fixing block 23. During the movement, the long rod 24 first disengages from the blind hole of the limiting block 26, and then disengages from the hollow tube 22. The angle limit of the mounting plate 11 is then released. Then, the mounting plate 11 is rotated clockwise. The mounting plate 11 drives the round tube 10 to rotate synchronously around the circumference of the sleeve rod 4. At the same time, the mounting plate 11 also drives the fixing block 23 and the limiting block 26 to rotate together. The fixed block 23 then drives the long rod 24 to rotate synchronously. During the rotation, the handle 25 is released, and the long rod 24 and the handle 25 naturally return to their original positions under the action of gravity. When the mounting plate 11 rotates to the preset position, the sealing strip on its outer wall fits tightly against the outer wall of the rectangular housing 6. With the cooperation of the mounting plate 11, the assembly groove of the rectangular housing 6 forms a sealed state. By pulling up the handle 25, the fixed constraint of the mounting plate 11 is quickly released, and then it is rotated to fit against the rectangular housing 6, which strengthens the protection of the electronic display screen 7 and isolates dust, moisture and external impact in the air. After the standby period ends, the staff first pulls the handle 25 up to the designated height, and then rotates the mounting plate 11 counterclockwise. This causes the round tube 10 to rotate synchronously around the circumference of the sleeve rod 4. When the mounting plate 11 rotates to the initial display position, the handle 25 is controlled to move downward. The handle 25 drives the long rod 24 to move downward synchronously. During the downward movement, the long rod 24 first fits tightly against the inner wall of the hollow tube 22. The hollow tube 22 forms an angle limit on the long rod 24, thereby fixing the placement angle of the mounting plate 11. Then the long rod 24 continues to move downward and fits tightly against the inner wall of the blind hole of the limiting block 26. The limiting block 26 forms a stable support for the long rod 24 through the blind hole, ensuring the reliability of the limit. Through the double limiting structure of the long rod 24 passing through the hollow tube 22 and embedding into the blind hole, the angle of the mounting plate 11 is stably fixed, ensuring that the mounting plate 11 will not deflect during the display and ensuring that the signage content is conveyed normally. When the long rod 24 rotates clockwise with the fixing block 23 toward the rectangular housing 6, the long rod 24 will first contact the edge of the elastic buckle 35. As the long rod 24 continues to rotate, it applies lateral pressure to the elastic buckle 35, forcing the elastic buckle 35 to undergo elastic deformation toward the convex plate 33. During the deformation process, the elastic buckle 35 will form a reverse elastic resistance to the long rod 24, effectively reducing the impact force of the collision when in contact. When the long rod 24 rotates to fit tightly against the inner wall of the elastic buckle 35, the pressure of the long rod 24 on the elastic buckle 35 gradually disappears. The elastic buckle 35 quickly recovers under the action of elastic restoring force and tightly wraps around the circumference of the long rod 24 after recovery, thereby enhancing the stability of the long rod 24 at this position. Through the wrapping fixation of the elastic buckle 35, the long rod 24 is kept stable in the designated position, avoiding the displacement of the mounting plate 11 due to slight vibration in the standby state, thereby better protecting the electronic display screen 7. When the long rod 24 rotates counterclockwise, its circumferential surface will press against the inner wall of the elastic buckle 35, causing the elastic buckle 35 to deform and gradually detach from and contact the long rod 24. When the long rod 24 completely detaches from and contacts the elastic buckle 35, the deformed elastic buckle 35 will quickly recover under the action of elastic restoring force. When replacing the elastic buckle 35, the worker pulls the pull ring plate 37 upward, causing it to move the elastic friction plate 36 upward simultaneously. During the upward movement, the elastic friction plate 36 rubs against the inner wall of the slide frame 31, which in turn moves the rectangular plate 32 precisely upward along the inner wall of the slide frame 31. The rectangular plate 32 then moves the convex plate 33 upward, and the convex plate 33 moves the elastic buckle 35 upward together through the connecting rod 34 until the rectangular plate 32 is completely pulled out of the slide frame 31. When installing the new rectangular plate 32, align it with the slide frame 31 and control the rectangular plate 32 to move downwards. During the downward movement, the rectangular plate 32 first aligns with the slide frame 31, and the protruding plate 33 then fits against the inner wall of the slide frame 31. As it continues to move downwards, the elastic friction plate 36 contacts the inner wall of the slide frame 31 and generates friction until the rectangular plate 32 is installed in place. At this time, the elastic friction plate 36 and the inner wall of the slide frame 31 form a tight contact surface, which effectively enhances the stability of the rectangular plate 32 in the slide frame 31. The convenient replacement of the elastic buckle 35 further improves the efficiency of overall operation and maintenance, reduces downtime, and ensures the stability of the rectangular plate 32 during installation with the elastic friction plate 36.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A height-adjustable signboard, comprising a base (1), characterized in that, The base (1) has a mounting hole at its top, and an electric drive lifting rod (2) is fixedly installed in the mounting hole. A control module is installed inside the electric drive lifting rod (2). The control module is used to receive remote commands to start and stop the electric drive lifting rod (2). A connecting block (3) is fixedly installed on the output end of the electric drive lifting rod (2). A sleeve rod (4) is fixedly installed on the top of the connecting block (3). The electric drive lifting rod (2) is used to drive the connecting block (3) to move the sleeve rod (4) vertically. The base (1) also includes: A bushing (5) is fixedly installed on the circumferential surface of the sleeve rod (4); A rectangular housing (6) is fixedly installed on the circumferential surface of the bushing (5), and an assembly groove is provided on the outer wall of the rectangular housing (6); An electronic display screen (7) is fixedly installed inside a rectangular housing (6) and is used to display electronic signage content. A support ring (8) is fixedly installed on the top of the base (1); A circular ring plate (9) is fixedly installed at the bottom of the sleeve rod (4), and a support ring (8) is used to support the circular ring plate (9).

2. The height-adjustable sign according to claim 1, characterized in that: The inner wall of the sleeve (4) slides against the circumferential surface of the electric-driven lifting rod (2), and the circumferential surface of the electric-driven lifting rod (2) serves as a guide for the sleeve (4).

3. The height-adjustable signboard according to claim 2, characterized in that: A circular tube (10) is rotatably mounted on the circumferential surface of the sleeve rod (4). A mounting plate (11) is fixedly mounted on the circumferential surface of the circular tube (10). A mounting groove is provided on the outer wall of the mounting plate (11). A writing board (12) is provided in the mounting groove. A rectangular groove is provided on the surface of the writing board (12). The writing board (12) is used to write text markings.

4. The height-adjustable sign according to claim 3, characterized in that: The outer wall of the mounting plate (11) is provided with a sealing strip, the surface of the writing board (12) is provided with a round hole, and a rubber rod (13) is fixedly installed in the rectangular groove of the mounting plate (11). The circumferential surface of the rubber rod (13) and the inner wall of the round hole are tightly fitted. The mounting plate (11) is provided with an angle locking device for angle positioning, and the rectangular shell (6) is provided with a safety protection device for safe operation.

5. A height-adjustable sign according to claim 4, characterized in that: The angle locking device includes a connecting plate (21), a hollow tube (22), a fixing block (23), a long rod (24), a handle (25), and a limiting block (26). The connecting plate (21) is fixedly installed on the circumferential surface of the bushing (5). The hollow tube (22) is fixedly inserted through the surface of the connecting plate (21). The fixing block (23) is fixedly installed on the outer wall of the mounting plate (11). A through hole is opened on the surface of the fixing block (23). The long rod (24) is slidably installed in the through hole. The handle (25) is fixedly installed on the top of the long rod (24). The limiting block (26) is fixedly installed on the outer wall of the mounting plate (11). The circumferential surface of the long rod (24) is tightly fitted with the inner wall of the hollow tube (22).

6. A height-adjustable sign according to claim 5, characterized in that: The top of the limiting block (26) is provided with a blind hole, and the bottom of the long rod (24) is closely fitted with the inner wall of the blind hole.

7. A height-adjustable sign according to claim 6, characterized in that: The safety protection device includes a sliding frame (31), a rectangular plate (32), a convex plate (33), a connecting rod (34), and an elastic buckle (35). The sliding frame (31) is fixedly installed in the assembly slot. The rectangular plate (32) is set in the sliding frame (31). The convex plate (33) is fixedly installed on the outer wall of the rectangular plate (32). The connecting rod (34) is fixedly installed on the side of the convex plate (33) away from the rectangular plate (32). The elastic buckle (35) is fixedly installed on the end of the connecting rod (34) away from the convex plate (33).

8. A height-adjustable sign according to claim 7, characterized in that: An elastic friction plate (36) is fixedly installed on the top of the rectangular plate (32). The elastic friction plate (36) is tightly fitted to the inner wall of the sliding frame (31). A pull ring plate (37) is fixedly installed on the top of the elastic friction plate (36).

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