A rotatable presentation screen

By combining the flip adjustment component and the height support component, the monitor can switch between multiple postures and adjust its height, solving the problem that existing monitor stands cannot meet the needs of multiple scenarios and improving the flexibility and convenience of using the monitor.

CN224680410UActive Publication Date: 2026-08-25HUBEI POLYTECHNIC INST
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Patent Information

Application Number
CN202520601984.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-04-01
Publication Date
2026-08-25
Estimated Expiration
2035-04-01

AI Technical Summary

Technical Problem

Existing monitor stands typically only allow monitors to be placed flat and stable, failing to meet the need for vertical setup of the presentation screen in different usage scenarios, thus limiting their usability.

Method used

A rotatable demonstration screen is provided, which can switch between flat and vertical states of the display by combining a flip adjustment component and a lifting support component, and the height can be adjusted. It includes the combined use of a bearing seat, a support shaft, a ring plate and a limit rod, and a connection structure between the lifting plate and the base.

Benefits of technology

It enables flexible switching of the monitor between different usage postures, improves the flexibility of use and the convenience of height adjustment, avoids interference from the base when flipping, and supports demonstration needs in multiple scenarios.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a rotatable demonstration screen, including display body and base, the back middle part of display body is fixed with the connecting plate, the rear of connecting plate is provided with the lifting plate in parallel, and the connecting plate with rear lifting plate is connected together through the turnover adjusting component combination. Advantageous effect lies in: the utility model discloses the back of display body is fixed with the connecting plate, and the connecting plate with rear lifting plate is connected together through the turnover adjusting component combination, then through the support pivot of turnover adjusting component around bearing pedestal rotation and through the limiting rod respectively with the horizontal limit hole and vertical limit hole longitudinal sliding fit's mode, can with display body respectively adjust to horizontal state and vertical state after and lock, the rotation adjustment mode of display body is simple and easy to realize, and it is convenient to adjust to the suitable use attitude of display body according to different needs in demonstration use.
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Description

Technical Field

[0001] This utility model relates to the field of auxiliary components for demonstration screens, specifically to a rotatable demonstration screen. Background Technology

[0002] In existing technologies, monitors are used as presentation screens in daily teaching or meetings. However, in actual use, due to different usage scenarios, in order to better and more comprehensively display information, the presentation screen needs to be set up horizontally in some cases and vertically in others. However, because the monitor stands that come with the monitors are designed in the past, they usually only allow the monitor to be placed stably in a horizontal position, which leads to certain limitations when using the monitor as a presentation screen. Utility Model Content

[0003] The purpose of this invention is to provide a rotatable presentation screen to solve the above problems, as detailed below.

[0004] To achieve the above objectives, the present invention provides the following technical solution: This utility model provides a rotatable demonstration screen, including a display body and a base. The display body is arranged horizontally and vertically. A connecting plate is fixed to the middle of the back of the display body. A lifting plate is arranged parallel to the rear of the connecting plate. The connecting plate and the lifting plate are connected together by a flip adjustment component, which is used to adjust the display body to a flat state and a vertical state respectively and then lock it. Lifting support components are assembled on both sides of the rear of the lifting plate, and the bottom of each lifting support component is connected to the flat base. The flat base is located below the display body, so as to adjust the overall height of the display body through the lifting support components.

[0005] Preferably, a power connection is provided on one side of the back of the display body, and multiple anti-slip pads are fixed around the bottom surface of the base.

[0006] Preferably, the tilting adjustment assembly includes a bearing housing, a support shaft, an annular plate, and a limiting rod. The bearing housing is fixedly installed at the center of the front of the lifting plate, and the inner ring of the slewing bearing built into the bearing housing is coaxially fixed to the support shaft arranged longitudinally. At the same time, the front of the support shaft is coaxially fixed to the combined sleeve installed on the back of the connecting plate. The annular plate is coaxially fixed to the back of the connecting plate outside the combined sleeve. A horizontal limiting hole and a vertical limiting hole are respectively opened longitudinally at the top and one side of the back of the annular plate. The horizontal limiting hole and the vertical limiting hole are located on the same circumference and are spaced at a right angle. The lifting plate has a mounting hole longitudinally opened above the bearing housing, and the mounting hole is longitudinally coaxially aligned with the horizontal limiting hole. The limiting rod is inserted longitudinally coaxially through the mounting hole in a sliding fit, and the front end of the limiting rod is longitudinally coaxially engaged with the horizontal limiting hole.

[0007] Preferably, the mounting hole, the horizontal limiting hole, and the vertical limiting hole are all threaded holes, the limiting rod is a stud, and the fit between the limiting rod and the mounting hole, the horizontal limiting hole, and the vertical limiting hole is a threaded fit.

[0008] Preferably, both the horizontal limiting hole and the vertical limiting hole are round holes, and the fitting relationship between the limiting rod and the mounting hole, the horizontal limiting hole and the vertical limiting hole is a coaxial sliding fit.

[0009] Preferably, a handle is coaxially fixed to the rear end of the limiting rod, and a spring is fitted to the portion of the limiting rod located between the handle and the back of the lifting plate, with both ends of the spring fixedly connected to the handle and the back of the lifting plate, respectively.

[0010] Preferably, each of the lifting support components includes a support plate and guide studs. The support plates are vertically fixed to both sides of the top surface of the base by fixing plates, and the support plates are respectively located on both sides of the back of the lifting plate. Each support plate has a guide groove vertically opened in the longitudinal direction, and the guide grooves are all through grooves in the longitudinal direction. The guide studs are fixed to the lower part of both sides of the back of the lifting plate in the longitudinal direction, and the guide studs pass through the corresponding guide grooves on the same side in a sliding fit manner. At the same time, the part of the guide studs extending out of the corresponding rear end of the guide groove is coaxially engaged with a clamping nut.

[0011] Preferably, the guide grooves are all waist-shaped elongated grooves with open tops, and when the guide stud moves to the top of the guide groove, the rotation process of the display body around the support axis does not interfere with the top surface of the base.

[0012] Preferably, the top of each guide groove is provided with an anti-loosening screw threaded through it laterally, and the inner end of each anti-loosening screw thread is inserted into the top of the corresponding guide groove.

[0013] Preferably, all the clamping nuts are hand-tightened knurled nuts, and all the guide studs have a handle coaxially fixed to their rear ends.

[0014] In the use of the aforementioned rotatable demonstration screen, specifically the display body, the connecting plate is fixed to the back of the display body, and the connecting plate is connected to the rear lifting plate via the flip adjustment assembly. The display body can be adjusted to a flat or vertical position and locked by the support shaft of the flip adjustment assembly rotating around the bearing seat and sliding longitudinally with the limiting rod through the horizontal and vertical limiting holes respectively. This simple and easy-to-implement rotation adjustment method allows the display body to be adjusted to a suitable posture according to different needs during demonstrations, improving the flexibility of the display body. Furthermore, the lifting support assembly is assembled on both sides of the rear of the lifting plate, and the bottom of each lifting support assembly is connected to the flat base. The guide studs of the lifting support assembly slide vertically along the guide groove, and the overall use of the display body can be controlled by tightening the clamping nut. The height adjustment method for the monitor body is simple and easy to implement, allowing for easy adjustment of the monitor body's height according to actual usage needs, further enhancing the monitor body's flexibility. Furthermore, by using the lifting support assembly to adjust the monitor body to its highest position, it ensures smooth tilting and adjustment of the monitor body, preventing the base from interfering with this smooth tilting and adjustment. Simultaneously, the top of the guide groove of the lifting support assembly is open and interspersed with an anti-detachment screw. The anti-detachment screw, inserted between the top ends of the guide groove, prevents the guide stud from accidentally detaching from the top of the guide groove and provides a limit indication of the highest position the monitor body can reach. When the anti-detachment screw disengages from the top ends of the guide groove, the guide stud slides vertically along the guide groove until it detaches from the top, allowing the monitor body and the lifting plate to be detached for inspection and maintenance.

[0015] The beneficial effects are as follows: 1. The present invention has a connecting plate fixed on the back of the display body, and the connecting plate and the rear lifting plate are connected together by a flip adjustment assembly. Then, by rotating the support shaft of the flip adjustment assembly around the bearing seat and sliding the limit rod with the horizontal limit hole and the vertical limit hole respectively, the display body can be adjusted to the horizontal state and the vertical state respectively and locked. The rotation adjustment method of the display body is simple and easy to realize, which makes it convenient to adjust the display body to the appropriate usage posture according to different needs during demonstration use, thus improving the flexibility of the display body. 2. Lifting support components are assembled on both sides of the rear of the lifting plate, and the bottom of the lifting support components is connected to the flat base. Then, by the guide studs of the lifting support components sliding vertically along the guide groove and tightening the clamping nut, the overall height of the monitor body can be adjusted. The height adjustment of the monitor body is simple and easy to implement, and it is convenient to match and adjust the height of the monitor body according to the actual use needs, further improving the flexibility of the monitor body. 3. By using the lifting support assembly to adjust the monitor body to its highest position, the monitor body can be smoothly flipped and adjusted in its usage posture. This avoids the base setting interfering with the smooth flipping and adjustment of the monitor body. At the same time, the top of the guide slide of the lifting support assembly is open and has anti-detachment screws inserted. The anti-detachment screws are inserted between the top of the guide slide, which can prevent the guide stud from accidentally detaching from the top of the guide slide and also provide a limit indication of the highest position of the monitor body. When the anti-detachment screws are removed from the top of the guide slide, the guide studs can slide vertically along the guide slide until they are detached from the top. Then, the monitor body and the lifting plate can be removed together for inspection and maintenance. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is an overall isometric schematic diagram of this utility model. Figure 1 ; Figure 2 This is an overall isometric schematic diagram of this utility model. Figure 2 ; Figure 3 This is a utility model Figure 1 A schematic diagram of the cross-section; Figure 4 This is a utility model Figure 1 Front view diagram; Figure 5 This is a utility model Figure 1 Rear view diagram; Figure 6 This is a utility model Figure 1 A left-view diagram; Figure 7 This is a utility model Figure 1 A top-down view.

[0018] The annotations in the attached figures are explained as follows: 1. Monitor body; 101. Power connection cable; 2. Base; 201. Anti-slip pad; 3. Connecting plate; 4. Lifting plate; 5. Lifting support assembly; 501. Anti-detachment screw; 502. Guide groove; 503. Compression nut; 504. Guide stud; 505. Handle; 506. Support plate; 507. Fixing piece; 6. Flip adjustment assembly; 601. Mounting hole; 602. Spring; 603. Handle; 604. Limiting rod; 605. Horizontal limiting hole; 606. Bearing seat; 607. Vertical limiting hole; 608. Support shaft; 609. Combination sleeve; 6010. Ring plate. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] See Figures 1-7As shown, this utility model provides a rotatable demonstration screen, including a display body 1 and a base 2. The display body 1 is arranged horizontally and vertically. A connecting plate 3 is fixed to the middle of the back of the display body 1. A lifting plate 4 is arranged parallel to the rear of the connecting plate 3. The connecting plate 3 and the lifting plate 4 are connected together by a flip adjustment assembly 6, which is used to adjust the display body 1 to a flat state and a vertical state and then lock it. Specifically, the flip adjustment assembly 6 includes a bearing seat 606, a support shaft 608, a ring plate 6010 and a limiting rod 604. The bearing seat 606 is fixedly installed in the middle of the front of the lifting plate 4. The inner ring of the rotary bearing built into the bearing seat 606 is coaxially fixed to the support shaft 608 arranged vertically. At the same time, the front of the support shaft 608 is coaxially fixed to the combination sleeve 609 installed on the back of the connecting plate 3. The ring plate 6010 is coaxially fixed to the back of the connecting plate 3 outside the combination sleeve 609. 010, and the top and one side of the back of the ring plate 6010 are respectively provided with a horizontal limiting hole 605 and a vertical limiting hole 607 along the longitudinal direction. The horizontal limiting hole 605 and the vertical limiting hole 607 are located on the same rotation circumference and are spaced at a right angle. The lifting plate 4 is provided with a mounting hole 601 along the longitudinal direction above the bearing seat 606. The mounting hole 601 is coaxially aligned with the horizontal limiting hole 605 in the longitudinal direction. The mounting hole 601 is inserted into the limiting rod 604 in the longitudinal direction in a sliding fit. The front end of the limiting rod 604 is coaxially aligned with the horizontal limiting hole 605 in the longitudinal direction. The purpose of this setting is that by rotating the support shaft 608 of the flip adjustment component 6 around the bearing seat 606 and sliding the limiting rod 604 with the horizontal limiting hole 605 and the vertical limiting hole 607 in the longitudinal direction, the display body 1 can be adjusted to the horizontal state and the vertical state respectively and then locked. The rotation adjustment method of the display body 1 is simple and easy to implement.

[0021] See Figures 1-3As shown, lifting support assemblies 5 are assembled on both sides of the rear of the lifting plate 4, and the bottom of each lifting support assembly 5 is connected to the flat base 2. The base 2 is flatly positioned below the monitor body 1, allowing for adjustment of the overall height of the monitor body 1 via the lifting support assemblies 5. Specifically, each lifting support assembly 5 includes a support plate 506 and guide studs 504. Support plates 506 are vertically fixed to both sides of the top surface of the base 2 via fixing pieces 507. The support plates 506 are located on both sides of the back of the lifting plate 4. Each support plate 506 has a guide groove 502 vertically formed along its longitudinal direction, and the guide grooves 502 are all through grooves in the longitudinal direction. Guide studs 504 are fixed to the lower part of both sides of the back of the lifting plate 4 along its longitudinal direction. All the columns 504 slide through the corresponding guide grooves 502 on the same side, and the parts of the guide studs 504 extending out of the rear end of the corresponding guide grooves 502 are coaxially engaged with the clamping nuts 503. The purpose of this arrangement is that, firstly, by sliding the guide studs 504 of the lifting support assembly 5 vertically along the guide grooves 502 and tightening the clamping nuts 503, the overall height of the monitor body 1 can be adjusted. The height adjustment of the monitor body 1 is simple and easy to achieve. At the same time, by adjusting the monitor body 1 to the highest position with the help of the lifting support assembly 5, the monitor body 1 can be smoothly flipped and adjusted in its usage posture, avoiding the interference of the base 2 on the smooth flipping and adjustment of the monitor body 1.

[0022] See Figures 1-3As shown, the monitor body 1, base 2, flip adjustment assembly 6, and lifting support assembly 5 have been optimized as follows: Specifically, a power connection cable 101 is assembled on one side of the back of the monitor body 1, and multiple anti-slip pads 201 are fixed around the bottom surface of the base 2 to facilitate the monitor body 1 to be powered on smoothly by plugging the power connection cable 101 into the power socket, and to facilitate the stable placement of the base 2 by using the anti-slip pads 201. Regarding the flip adjustment assembly 6, optionally, the mounting hole 601, the horizontal limiting hole 605, and the vertical limiting hole 607 are all threaded holes, and the limiting rod 604 is a stud. The fitting relationship between the limiting rod 604 and the mounting hole 601, the horizontal limiting hole 605, and the vertical limiting hole 607 is all threaded. This design facilitates the quick assembly and disassembly of the limiting rod 604 with the mounting hole 601, the horizontal limiting hole 605, and the vertical limiting hole 607 by screwing. Alternatively, both the horizontal limiting hole 605 and the vertical limiting hole 607 are round holes, and the limiting rod 604 is coaxially slidingly fitted with the mounting hole 601, the horizontal limiting hole 605 and the vertical limiting hole 607. The rear end of the limiting rod 604 is coaxially fixed with a handle 603, and the portion of the limiting rod 604 located between the handle 603 and the back of the lifting plate 4 is coaxially fitted with a spring 602. The two ends of the spring 602 are fixedly connected to the handle 603 and the back of the lifting plate 4, respectively. This arrangement facilitates the quick disassembly and assembly of the limiting rod 604 with the mounting hole 601, the horizontal limiting hole 605 and the vertical limiting hole 607 by pulling or releasing.

[0023] See Figures 1-7As shown, specifically for the lifting support assembly 5, the guide slide 502 is an open-top waist-shaped long slot. When the guide stud 504 moves to the top of the guide slide 502, the flipping process of the display body 1 around the support pivot 608 does not interfere with the top surface of the base 2. With this setting, the guide slide 502 can have a setting length that meets the usage requirements, and the guide stud 504 can slide in and out from the top of the guide slide 502. Alternatively, the top of each guide groove 502 is threaded with an anti-detachment screw 501 inserted laterally, and the inner end of each anti-detachment screw 501 is inserted into the top of the corresponding guide groove 502. With this configuration, the anti-detachment screw 501 inserted between the tops of the guide groove 502 can prevent the guide stud 504 from accidentally detaching from the top of the guide groove 502, and can also provide a limit indication of the highest position of the display body 1. When the anti-detachment screw 501 is removed from the tops of the guide groove 502, the guide stud 504 can slide vertically along the guide groove 502 until it detaches from the top. Furthermore, all compression nuts 503 are hand-tightened knurled nuts, and the rear end of each guide stud 504 is coaxially fixed with a handle 505 so that the compression nuts 503 can be directly tightened and loosened by hand. At the same time, it is also convenient to use the handle 505 to drive the compression stud to slide vertically along the guide groove 502 for adjustment.

[0024] With the above structure, specifically in the use of the monitor body 1, since a connecting plate 3 is fixed to the back of the monitor body 1, and the connecting plate 3 is connected to the rear lifting plate 4 by a flip adjustment assembly 6, the monitor body 1 can be adjusted to a flat or vertical position and locked by the support shaft 608 of the flip adjustment assembly 6 rotating around the bearing seat 606 and the limiting rod 604 sliding longitudinally with the horizontal limiting hole 605 and the vertical limiting hole 607 respectively. The rotation adjustment of the monitor body 1 is simple and easy to implement, making it convenient to adjust the monitor body 1 to a suitable usage posture according to different needs during demonstration use, thus improving the usage flexibility of the monitor body 1. Since lifting support assemblies 5 are combined on both sides of the rear of the lifting plate 4, and the bottom of the lifting support assemblies 5 are connected to the flat base 2, the overall usage height of the monitor body 1 can be adjusted by the guide stud 504 of the lifting support assembly 5 sliding vertically along the guide groove 502 and tightening the clamping nut 503. The height adjustment method of the monitor body 1 is simple and easy to implement, making it convenient to match and adjust the height of the monitor body 1 according to actual usage needs, further improving the flexibility of the monitor body 1. Moreover, since the monitor body 1 is adjusted to the highest position by means of the lifting support component 5, it can ensure that the monitor body 1 can be smoothly flipped and adjusted in the use posture, avoiding the interference of the base 2 setting on the smooth flipping and adjustment of the monitor body 1. At the same time, the top of the guide slide 502 of the lifting support component 5 is open and an anti-detachment screw 501 is inserted. The anti-detachment screw 501 is inserted between the top of the guide slide 502, which can prevent the guide stud 504 from accidentally detaching from the top of the guide slide 502, and can also provide a limit indication of the highest position of the monitor body 1. When the anti-detachment screw 501 is disengaged from the top of the guide slide 502, the guide stud 504 can slide vertically along the guide slide 502 until it is disengaged from the top, and then the monitor body 1 and the lifting plate 4 can be removed together for inspection and maintenance.

[0025] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A rotatable presentation screen, comprising a display body (1) and a base (2), characterized in that: The display body (1) is arranged vertically along the horizontal direction. A connecting plate (3) is fixed in the middle of the back of the display body (1). A lifting plate (4) is arranged parallel to the rear of the connecting plate (3). The connecting plate (3) and the lifting plate (4) are connected together by a flip adjustment component (6) to adjust the display body (1) to a flat state and a vertical state respectively and then lock it. Lifting support components (5) are assembled on both sides of the rear of the lifting plate (4), and the bottom of the lifting support components (5) is connected to the flat base (2). The base (2) is flatly located below the display body (1) to adjust the overall height of the display body (1) through the lifting support components (5).

2. The rotatable demonstration screen according to claim 1, characterized in that: A power connection cable (101) is assembled on one side of the back of the display body (1), and multiple anti-slip pads (201) are fixed around the bottom surface of the base (2).

3. The rotatable presentation screen according to claim 1, characterized in that: The flipping adjustment assembly (6) includes a bearing housing (606), a support shaft (608), an annular plate (6010), and a limiting rod (604). The bearing housing (606) is fixedly installed at the center of the front of the lifting plate (4), and the inner ring of the slewing bearing built into the bearing housing (606) is coaxially fixed to the support shaft (608) arranged longitudinally. At the same time, the front of the support shaft (608) is coaxially fixed to the combination sleeve (609) installed on the back of the connecting plate (3). The annular plate (6010) is coaxially fixed to the back of the connecting plate (3) at a position outside the combination sleeve (609). A horizontal limiting hole (605) and a vertical limiting hole (607) are respectively opened longitudinally at the top and one side. The horizontal limiting hole (605) and the vertical limiting hole (607) are located on the same circumference of rotation and are spaced apart by a right angle. The lifting plate (4) is provided with a mounting hole (601) longitudinally above the bearing seat (606). The mounting hole (601) is longitudinally coaxial with the horizontal limiting hole (605). The limiting rod (604) is inserted longitudinally coaxially through the mounting hole (601) in a sliding fit. The front end of the limiting rod (604) is longitudinally coaxially fitted with the horizontal limiting hole (605).

4. The rotatable presentation screen according to claim 3, characterized in that: The mounting hole (601), the horizontal limiting hole (605), and the vertical limiting hole (607) are all threaded holes, the limiting rod (604) is a stud, and the fitting relationship between the limiting rod (604) and the mounting hole (601), the horizontal limiting hole (605), and the vertical limiting hole (607) is a threaded fit.

5. A rotatable presentation screen according to claim 3, characterized in that: Both the horizontal limiting hole (605) and the vertical limiting hole (607) are round holes, and the limiting rod (604) and the mounting hole (601), the horizontal limiting hole (605) and the vertical limiting hole (607) are all coaxial sliding fits.

6. The rotatable presentation screen according to claim 5, characterized in that: The rear end of the limiting rod (604) is coaxially fixed with a handle (603). A spring (602) is fitted between the limiting rod (604) and the back of the lifting plate (4) on a portion of the coaxial gap. The two ends of the spring (602) are fixedly connected to the handle (603) and the back of the lifting plate (4), respectively.

7. A rotatable presentation screen according to any one of claims 3-6, characterized in that: Each of the lifting support components (5) includes a support plate (506) and a guide stud (504). The support plate (506) is vertically fixed on both sides of the top surface of the base (2) by a fixing piece (507). The support plate (506) is located on both sides of the back of the lifting plate (4). The support plate (506) is vertically provided with a guide groove (502) along the longitudinal direction. The guide groove (502) is a through groove in the longitudinal direction. The guide stud (504) is fixed on the lower part of both sides of the back of the lifting plate (4) along the longitudinal direction. The guide stud (504) passes through the corresponding guide groove (502) on the same side in a sliding fit manner. At the same time, the part of the guide stud (504) extending out of the rear end of the corresponding guide groove (502) is coaxially engaged with a clamping nut (503).

8. A rotatable presentation screen according to claim 7, characterized in that: The guide grooves (502) are all waist-shaped long grooves with open tops, and when the guide stud (504) moves to the top of the guide groove (502), the flipping process of the display body (1) around the support pivot (608) does not interfere with the top surface of the base (2).

9. A rotatable presentation screen according to claim 8, characterized in that: The top of each guide groove (502) is threaded with an anti-detachment screw (501) inserted laterally, and the inner end of each anti-detachment screw (501) is inserted into the top of the corresponding guide groove (502).

10. A rotatable presentation screen according to claim 8 or 9, characterized in that: All the clamping nuts (503) are hand-tightened knurled nuts, and the rear end of each guide stud (504) is coaxially fixed with a handle (505).