Height-adjustable projection screen fixing frame for works exhibition
Patent Information
- Application Number
- CN202522685847.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-18
- Publication Date
- 2026-10-20
- Estimated Expiration
- 2035-12-18
AI Technical Summary
[0005]为解决高度调节不便、幕布展开有褶皱的技术问题，本实用新型提供一种作品展示用可调节高度投影幕固定架
1、本实用新型高度调节精准稳定，适配性强。本实用新型通过四组对称分布的液压杆构成升降机构，液压杆同步伸缩可驱动支撑底板平稳升降，实现投影幕高度的精准调控，能灵活适配展览展示、学术会议、教学演示等不同场景的视角需求。相较于现有固定式固定架无法调节高度、简易可调节式稳定性不足的问题，多组对称液压杆的设计既提升了整体支撑强度，又避免了高度调节过程中的晃动，保障了展示过程的稳定性，有效解决了现有设备高度调节灵活性与稳定性难以兼顾的痛点。
Smart Images
Figure CN224873830U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of projection, and in particular to an adjustable height projection screen mounting bracket for displaying artworks. Background Technology
[0002] In exhibitions, academic conferences, and teaching demonstrations, the projection screen, as the core image-carrying component, directly impacts the display effect due to its stability and height adjustment flexibility. With the diversification of display needs, the requirements for the installation height and flatness of the projection screen in different scenarios are increasing, making projection screen mounting brackets a crucial piece of equipment for ensuring display quality.
[0003] Currently, projection screen holders for artwork display on the market are mainly divided into two categories: fixed and simple adjustable types. Furthermore, the existing projection screen holders have significant flaws in their screen storage and unfolding mechanisms: some products lack a dedicated screen flatness retention structure, causing the screen to sag or shift laterally under its own weight after unfolding, resulting in wrinkles or skew, severely affecting the clarity and aesthetics of the projected image; other products rely on manual dragging and folding for screen storage, or use a simple roller structure, which easily causes screen wear during storage and is cumbersome, time-consuming, and laborious; at the same time, existing screens offer a vertical viewing angle when unfolded, which cannot be adjusted, making them unsuitable for special scenarios.
[0004] The aforementioned problems result in insufficient adjustment flexibility and practicality of existing projection screen holders in actual use, failing to fully meet the high requirements of equipment convenience, stability, and display effect for artwork presentations. Therefore, there is an urgent need for a projection screen holder that offers highly precise and convenient adjustment, allows for flat screen unfolding, and provides efficient storage to address these technical pain points. Utility Model Content
[0005] To address the technical problems of inconvenient height adjustment and wrinkles when the screen is unfolded, this utility model provides an adjustable height projection screen mounting bracket for displaying artworks.
[0006] This utility model is achieved by the following technical solution: an adjustable height projection screen fixing frame for displaying works, including a lifting mechanism, a screen storage and adjustment mechanism, and a moving adjustment mechanism; The lifting mechanism includes a base for providing stable support and hydraulic rods vertically mounted on the upper surface of the base. There are at least four sets of hydraulic rods that are symmetrically distributed. The top of the hydraulic rods is fixedly connected to the lower surface of the support base plate. The support base plate is driven to rise and fall in the vertical direction by the extension and retraction of the hydraulic rods.
[0007] The screen retraction and adjustment mechanism includes a horizontally positioned support base plate. A through-groove is formed along the length of the support base plate's surface. A support frame is fixedly mounted on the support base plate's surface, and a bearing sleeve is fixedly mounted at the top of the support frame. A rotatable handle for manual operation is rotatably connected to the outer surface of the support base plate. A first gear is rotatably connected to the surface of the handle. One end of a chain is sleeved on the surface of the first gear, and a second gear is sleeved on the other end of the chain. A screen roller is fixedly connected to the outer side of the second gear. A projection screen is wound around the surface of the screen roller, and a support frame for maintaining the screen's flatness is fixedly mounted at the bottom of the projection screen. The first gear is driven by the chain, and the second gear is connected to the screen roller. Rotation of the second gear drives the screen roller to rotate.
[0008] The support frame has symmetrically fixed slots at both ends, which form a detachable snap-fit connection with the mounting plate. The slots are fitted into the inner side of the mounting plate, which is vertically fixed to the upper surface of the slider. The slider and the slide groove form a sliding guide connection, with the slider fitted into the inside of the slide groove. The sliding direction of the slider is consistent with the unfolding direction of the projection screen. The two ends of the slider are U-shaped and are fitted into the inner plate of the slide groove.
[0009] The movable adjustment mechanism includes a fixed block, which is fixedly connected to the bottom end of the support base plate. There are two sets of fixed blocks, and a rotating screw is rotatably connected to the inner side of the two sets of fixed blocks. A movable bushing is rotatably sleeved on the surface of the rotating screw. A movable frame is fixedly connected to both ends of the movable bushing. The movable frame is L-shaped, and the top of the movable frame is integrally formed into a receiving frame. The receiving frame is slidably engaged inside the slide groove. The top of the receiving frame is connected to the slider. One end of the rotating screw extends to the outside of the fixed block and is fixedly connected to a handle. By rotating the handle, the rotating screw is driven to rotate, thereby moving the receiving frame.
[0010] As a further optimization of this utility model, the lifting mechanism includes a base for providing stable support and hydraulic rods vertically installed on the upper surface of the base. The hydraulic rods are arranged in at least four sets and are symmetrically distributed. Their top ends are fixedly connected to the lower surface of the support base plate of the screen storage and adjustment mechanism. Through the synchronous extension and retraction of the hydraulic rods, the support base plate can be driven to rise and fall smoothly in the vertical direction, thereby driving the entire screen-related structure to rise and fall synchronously. This not only enables precise adjustment of the projection screen height to meet the viewing angle requirements of different display scenarios, but also improves the overall support stability through the arrangement of multiple sets of symmetrical hydraulic rods, avoiding swaying during height adjustment.
[0011] As a further optimization of this utility model, the screen retraction and adjustment mechanism adopts a gear-chain transmission structure to realize the retraction and unfolding of the screen. Specifically, it includes a rotating handle rotatably connected to the outer surface of the support base plate. The rotating handle is connected to a first gear, which is driven by a chain belt to a second gear. A screen roller is fixedly connected to the outside of the second gear, and a projection screen is wrapped around the surface of the screen roller. By manually rotating the handle, the gear set can be driven synchronously, thereby driving the screen roller to rotate to realize the unfolding or retraction of the screen. This transmission method has a compact structure and smooth transmission. It can reduce the intensity of manual operation, avoid the wear and tear on the screen caused by traditional manual dragging and folding, improve the efficiency of screen retraction and unfolding, and ensure convenient operation.
[0012] As a further optimization of this utility model, the screen storage and adjustment mechanism also features a dedicated screen flatness retention structure. A support frame is fixedly installed at the bottom of the projection screen, and slots are symmetrically fixed at both ends of the support frame. The slots and a plate vertically fixed to the upper surface of the slider form a detachable snap-fit engagement, and the slots are fitted into the inner side of the plate. The slider is fitted into a through-type groove on the surface of the support base plate, and its sliding direction is consistent with the unfolding direction of the projection screen. The two ends of the slider are U-shaped and are fitted into the inner plate of the groove. This structure provides supporting tension to the bottom of the screen through the support frame. Combined with the sliding guide effect of the slider and the groove, it can effectively prevent wrinkles caused by the screen sagging under its own weight during unfolding, while avoiding side offset, significantly improving the clarity and aesthetics of the projected image. The detachable design of the slots and the plate provides convenient conditions for screen storage.
[0013] As a further optimization of this utility model, a bearing sleeve is fixedly installed at the top of the support frame of the curtain storage and adjustment mechanism. The bearing sleeve rotates and cooperates with the curtain roller to provide stable support for the rotation of the curtain roller, reduce frictional resistance during rotation, further ensure the smoothness of the curtain opening and closing process, and avoid curtain wear or transmission jamming caused by friction.
[0014] As a further optimization of this utility model, the movable adjustment mechanism includes two sets of fixed blocks fixedly connected to the bottom of the support base plate. A rotating screw is rotatably connected to the inner side of the two sets of fixed blocks. A movable bushing is rotatably sleeved on the surface of the rotating screw. An L-shaped movable frame is fixedly connected to both ends of the movable bushing. The top of the movable frame is integrally formed into a receiving frame. The receiving frame is slidably engaged inside the slide groove and its top end is connected to the slider. One end of the rotating screw extends to the outside of the fixed block and is fixedly connected to a handle. By rotating the handle, the rotating screw is driven to rotate, which can drive the movable bushing to move along the screw axis. Then, through the movable frame and the receiving frame, the slider is driven to slide precisely along the slide groove. On the one hand, it can pull the support frame to adjust the overall tilt angle of the projection screen, adapting to the viewing angle requirements of special display scenarios, such as reviewing architectural design drawings or tiered classrooms where the audience is distributed in a stepped manner. On the other hand, it can further pull the screen to eliminate local wrinkles, ensuring the overall flatness of the screen when unfolded, and achieving an optimized upgrade of the display effect.
[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model offers precise and stable height adjustment with strong adaptability. It utilizes a lifting mechanism comprised of four symmetrically distributed hydraulic rods. The synchronous extension and retraction of these hydraulic rods drive the support base plate to rise and fall smoothly, achieving precise height control of the projection screen. This allows for flexible adaptation to the viewing angle requirements of various scenarios such as exhibitions, academic conferences, and teaching demonstrations. Compared to existing fixed brackets that cannot adjust height and simple adjustable brackets that lack stability, the design of multiple symmetrical hydraulic rods enhances overall support strength and prevents swaying during height adjustment, ensuring stability during the display process. This effectively solves the pain point of existing equipment where flexibility and stability in height adjustment are difficult to balance.
[0016] 2. This utility model offers convenient and efficient curtain unfolding and retraction with low wear. The curtain unfolding and adjustment mechanism adopts a gear-chain drive structure, coupled with a bearing sleeve at the top of the support frame. The curtain rollers can be smoothly rotated by manually turning the handle, enabling rapid unfolding and retraction of the curtain. This transmission method is compact and stable, significantly reducing manual operation intensity and avoiding curtain wear caused by traditional manual dragging and folding. It also improves unfolding and retraction efficiency, solving the problems of cumbersome operation and easy damage to the curtain caused by existing simple roller structures. Simultaneously, the bearing sleeve reduces frictional resistance during curtain roller rotation, further ensuring smooth unfolding and retraction and extending the curtain's lifespan.
[0017] 3. This utility model boasts superior screen flatness and excellent display effect. A dedicated flatness-maintaining structure, comprised of a support frame, slots, plates, sliders, and tracks, provides comprehensive flatness protection for the screen. The support frame provides supporting tension to the bottom of the screen, while the sliding guide mechanism of the sliders and tracks effectively prevents side shifting of the screen. Their combined action prevents wrinkles caused by the screen sagging under its own weight, significantly improving the clarity and aesthetics of the projected image. Furthermore, the detachable design of the slots and plates ensures flatness while providing convenient storage for the screen, solving the core problem of poor display effects caused by the lack of a dedicated flatness structure in existing equipment.
[0018] 4. This utility model offers flexible and diverse viewing angle adjustments, adapting to special scenarios. The movable adjustment mechanism drives the screw to rotate by turning the handle, causing the slider and support frame to move laterally. This allows for precise adjustment of the projection screen's tilt angle, meeting the needs of special scenarios such as tiered classrooms and architectural drawing reviews, ensuring a good experience for viewers or users from different positions and perspectives. Furthermore, by pulling the screen, local wrinkles can be further eliminated, optimizing the flatness. Compared to existing fixed frames that only allow vertical display and have fixed viewing angles, this design significantly improves the equipment's practicality and flexibility, broadens the product's applicability, and meets the personalized needs of diverse display scenarios. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the connection structure of the curtain storage and adjustment mechanism of this utility model; Figure 3 This utility model Figure 2 Second-view diagram of the mid-structure; Figure 4 This utility model Figure 2 Enlarged schematic diagram of the structure of region A in the middle.
[0020] Explanation of key symbols: 1. Lifting mechanism; 11. Base; 12. Hydraulic rod; 2. Screen storage and adjustment mechanism; 21. Support base plate; 22. Slide groove; 23. Support frame; 24. Bearing sleeve; 25. Rotating handle; 26. First gear; 27. Chain belt; 28. Second gear; 29. Screen roller; 210. Projection screen; 211. Support frame; 212. Slot; 213. Card plate; 214. Slider; 3. Moving adjustment mechanism; 31. Fixing block; 32. Rotating screw; 33. Moving bushing; 34. Moving frame; 35. Support frame; 36. Handle. Detailed Implementation
[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.
[0022] Example 1
[0023] Please combine Figures 1-4 This embodiment proposes an adjustable height projection screen mounting bracket for displaying works, including a lifting mechanism 1, a screen storage and adjustment mechanism 2, and a moving adjustment mechanism 3; The lifting mechanism 1 includes a base 11 for providing stable support and hydraulic rods 12 vertically mounted on the upper surface of the base 11. The hydraulic rods 12 are arranged in at least four sets and are symmetrically distributed. The top of the hydraulic rods 12 is fixedly connected to the lower surface of the support base plate 21. The support base plate 21 is driven to rise and fall in the vertical direction by the extension and retraction of the hydraulic rods 12.
[0024] In the specific technical solution, the lifting mechanism 1 provides the foundation for height adjustment of the entire fixed frame, and its core is to achieve height control through the telescopic movement of hydraulic rods 12. The base 11 serves as the load-bearing foundation, providing stable support for the entire device. Four sets of symmetrically distributed hydraulic rods 12 are vertically installed on the upper surface of the base 11, and the top of the hydraulic rods 12 is fixedly connected to the lower surface of the support base plate 21 of the screen storage and adjustment mechanism 2. When it is necessary to adjust the display height of the projection screen, the hydraulic rods 12 telescopically move, directly driving the support base plate 21 to rise and fall smoothly in the vertical direction, thereby driving the screen storage and adjustment mechanism 2, the moving adjustment mechanism 3, and the projection screen 210 fixed on the support base plate 21 to rise and fall synchronously, ultimately achieving precise adjustment of the projection screen height to adapt to the viewing angle requirements of different display scenarios.
[0025] The screen storage and adjustment mechanism 2 includes a horizontally arranged support base plate 21. A through-type sliding groove 22 is opened on the surface of the support base plate 21 along the length direction. A support frame 23 is fixedly installed on the surface of the support base plate 21. A bearing sleeve 24 is fixedly installed on the top of the support frame 23. A rotating handle 25 for easy manual operation is rotatably connected to the outer surface of the support base plate 21. A first gear 26 is rotatably connected to the surface of the rotating handle 25. One end of a chain belt 27 is sleeved on the surface of the first gear 26. A second gear 28 is sleeved on the other end of the chain belt 27. A screen roller 29 is fixedly connected to the outside of the second gear 28. A projection screen 210 is wrapped around the surface of the screen roller 29. A support frame 211 for keeping the screen flat is fixedly installed at the bottom of the projection screen 210.
[0026] Furthermore, the first gear 26 is connected to the second gear 28 via a chain belt 27, and the second gear 28 is connected to the curtain roller 29. The rotation of the second gear 28 drives the curtain roller 29 to rotate.
[0027] The two ends of the support frame 211 are symmetrically fixedly connected with slots 212. The slots 212 and the plate 213 form a detachable snap-fit engagement, and the slots 212 are adapted to snap-fit into the inner side of the plate 213. The plate 213 is vertically fixedly installed on the upper surface of the slider 214. The slider 214 and the slide groove 22 form a sliding guide engagement, and the slider 214 is adapted to slide snap-fit into the inside of the slide groove 22. The sliding direction of the slider 214 is consistent with the unfolding direction of the projection screen 210.
[0028] It should be noted that the two ends of the slider 214 are U-shaped, and the two ends of the slider 214 are engaged in the inner plate of the slide groove 22.
[0029] Specifically, the screen retraction and adjustment mechanism 2 is responsible for the unfolding and retraction of the projection screen 210, and its transmission core relies on a gear-chain mesh structure. The support frame 23 is fixed to the surface of the support base plate 21, and its top bearing sleeve 24 provides rotational support for the screen roller 29, ensuring smooth rotation of the screen roller 29. When the projection screen 210 needs to be unfolded, the rotating handle 25 on the outer surface of the support base plate 21 is manually rotated. The rotating handle 25 drives the first gear 26 connected to it to rotate synchronously. The first gear 26 transmits power to the second gear 28 through the chain belt 27 sleeved on its surface, causing the second gear 28 to rotate synchronously. Since the second gear 28 is fixedly connected to the screen roller 29, the rotation of the second gear 28 directly drives the screen roller 29 to rotate, and the projection screen 210 wrapped around the surface of the screen roller 29 unfolds downwards accordingly.
[0030] At this time, the support frame 211 at the bottom of the projection screen 210 plays a flattening role. The slots 212 at both ends of the support frame 211 and the card plate 213 form a detachable snap-fit engagement. When the projection screen 210 is stored, the snap-fit between the slots 212 and the card plate 213 needs to be removed for storage. When the projection screen 210 is unfolded, the slots 212 and the card plate 213 need to be snapped together for fixation. More specifically, the locking plate 213 is vertically fixed to the upper surface of the slider 214. The slider 214 is fitted into the groove 22 of the supporting base plate 21, and the sliding direction of the slider 214 is consistent with the unfolding direction of the projection screen 210. During the unfolding process, the slider 214 slides synchronously along the groove 22, providing guiding support for the support frame 211 and preventing the projection screen 210 from shifting to the side or wrinkling. When it is necessary to store the screen, the locking slot 212 is disconnected from the locking plate 213, and the rotating handle 25 is rotated in the opposite direction. Through the gear-chain transmission structure, the screen roller 29 is rotated in the opposite direction, and the projection screen 210 is rewound onto the surface of the screen roller 29, completing the storage.
[0031] The movable adjustment mechanism 3 includes a fixed block 31, which is fixedly connected to the bottom end of the support base plate 21. There are two sets of fixed blocks 31, and a rotating screw 32 is rotatably connected to the inner side of the two sets of fixed blocks 31. A movable bushing 33 is rotatably sleeved on the surface of the rotating screw 32. A movable frame 34 is fixedly connected to both ends of the movable bushing 33. The movable frame 34 is L-shaped. The top end of the movable frame 34 is integrally formed into a receiving frame 35. The receiving frame 35 is slidably engaged inside the slide groove 22. The top end of the receiving frame 35 is connected to the slider 214. One end of the rotating screw 32 extends to the outside of the fixed block 31 and is fixedly connected to a handle 36. By rotating the handle 36, the rotating screw 32 is driven to rotate, which drives the receiving frame 35 to move.
[0032] Specifically, the movable adjustment mechanism 3 is used to assist in optimizing the flatness of the unfolded projection screen 210. Its power transmission is achieved through a screw-bushing connection. Two sets of fixed blocks 31 are fixed to the bottom of the support base plate 21, and the rotating screw 32 is rotatably connected to the inner side of the two sets of fixed blocks 31. The trapezoidal external thread on the surface of the rotating screw 32 is adapted to mesh with the internal thread on the inner wall of the movable bushing 33. If there is local unevenness after the projection screen 210 is unfolded, the handle 36 at one end of the rotating screw 32 is rotated to drive the rotating screw 32 to rotate. The movable bushing 33 moves axially along the rotating screw 32 under the action of the thread, thereby driving the L-shaped movable frame 34 fixedly connected to the movable bushing 33 to move synchronously. The receiving frame 35, which is integrally formed at the top of the movable frame 34, slides and engages inside the slide groove 22. The top of the receiving frame 35 is connected to the slider 214. Therefore, when the receiving frame 35 moves with the movable frame 34, it will drive the slider 214 to slide precisely along the slide groove 22. Through the engagement relationship between the locking plate 213 and the locking slot 212, the support frame 211 is driven to adjust laterally, thereby pulling the bottom of the projection screen 210 and adjusting the overall tilt angle of the projection screen 210. The projection screen 210 is adjusted to a suitable tilt angle, finding the most suitable tilt angle for application in special scenarios. At the same time, the pulling process can also eliminate screen wrinkles and ensure that the projection screen 210 is fully unfolded and flat.
[0033] The overall working principle of this utility model is as follows: I. Working Principle of Height Adjustment of Lifting Mechanism The lifting mechanism 1 provides the foundation for height adjustment of the entire mounting frame. Its core mechanism achieves height control through the telescopic movement of hydraulic rods 12. The base 11 serves as the load-bearing foundation, providing stable support for the entire device. Four symmetrically distributed hydraulic rods 12 are vertically mounted on the upper surface of the base 11, with the top ends of the hydraulic rods 12 fixedly connected to the lower surface of the support base plate 21 of the screen storage and adjustment mechanism 2. When the projection screen's display height needs adjustment, the hydraulic rods 12 simultaneously telescopically extend and retract, directly driving the support base plate 21 to smoothly rise and fall vertically. This, in turn, causes the screen storage and adjustment mechanism 2, the moving adjustment mechanism 3, and the projection screen 210, all fixed to the support base plate 21, to rise and fall synchronously, ultimately achieving precise adjustment of the projection screen height to adapt to the viewing angle requirements of different display scenarios.
[0034] II. Working Principle of the Curtain Retraction and Adjustment Mechanism The screen retraction and adjustment mechanism 2 is responsible for unfolding and retracting the projection screen 210. Its transmission core relies on a gear-chain mesh structure. The support frame 23 is fixed to the surface of the support base plate 21, and the bearing sleeve 24 at its top provides rotational support for the screen roller 29, ensuring smooth rotation of the screen roller 29. When it is necessary to unfold the projection screen 210, the rotating handle 25 on the outer surface of the support base plate 21 is manually rotated. The rotating handle 25 drives the first gear 26 connected to it to rotate synchronously. The first gear 26 transmits power to the second gear 28 through the chain belt 27 sleeved on the surface, causing the second gear 28 to rotate synchronously. Since the second gear 28 is fixedly connected to the screen roller 29, the rotation of the second gear 28 directly drives the screen roller 29 to rotate, and the projection screen 210 wrapped around the surface of the screen roller 29 unfolds downwards accordingly.
[0035] At this time, the support frame 211 at the bottom of the projection screen 210 plays a flattening role. The slots 212 at both ends of the support frame 211 and the card plate 213 form a detachable snap-fit engagement. When the projection screen 210 is stored, the snap-fit between the slots 212 and the card plate 213 needs to be removed for storage. When the projection screen 210 is unfolded, the slots 212 and the card plate 213 need to be snapped together for fixation. The locking plate 213 is vertically fixed to the upper surface of the slider 214. The slider 214 is fitted into the groove 22 of the support base plate 21, and the sliding direction of the slider 214 is consistent with the unfolding direction of the projection screen 210. During the unfolding process, the slider 214 slides synchronously along the groove 22, providing guiding support for the support frame 211 and preventing the projection screen 210 from shifting to the side or wrinkling. When it is necessary to store the screen, the locking slot 212 is disconnected from the locking plate 213, and the rotating handle 25 is rotated in the opposite direction. Through the gear-chain transmission structure, the screen roller 29 is rotated in the opposite direction, and the projection screen 210 is rewound onto the surface of the screen roller 29, completing the storage.
[0036] III. Working Principle of the Movable Adjustment Mechanism for Curtain Leveling The movable adjustment mechanism 3 is used to assist in optimizing the flatness of the projection screen 210 when unfolded. Its power transmission is achieved through a screw-bushing engagement. Two sets of fixing blocks 31 are fixed to the bottom of the support base plate 21. The rotating screw 32 is rotatably connected to the inner side of the two sets of fixing blocks 31. The trapezoidal external thread on the surface of the rotating screw 32 is adapted to engage with the internal thread on the inner wall of the movable bushing 33. If there is local unevenness after the projection screen 210 is unfolded, rotating the handle 36 at one end of the rotating screw 32 will drive the rotating screw 32 to rotate. The movable bushing 33 moves axially along the rotating screw 32 under the action of the thread, thereby driving the L-shaped movable frame 34, which is fixedly connected to the movable bushing 33, to move synchronously. The receiving frame 35, which is integrally formed at the top of the movable frame 34, slides and engages inside the slide groove 22. The top of the receiving frame 35 is connected to the slider 214. Therefore, when the receiving frame 35 moves with the movable frame 34, it will drive the slider 214 to slide precisely along the slide groove 22. Through the engagement relationship between the locking plate 213 and the locking slot 212, the support frame 211 is driven to adjust laterally, thereby pulling the bottom of the projection screen 210 and adjusting the overall tilt angle of the projection screen 210. The projection screen 210 is adjusted to a suitable tilt angle, and the most suitable tilt angle is found for special scenarios, such as reviewing architectural design drawings or tiered classrooms where the audience is distributed in a stepped manner. At the same time, the pulling process can also eliminate screen wrinkles and ensure that the projection screen 210 is fully unfolded and flat.
[0037] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.
Claims
1. An adjustable height projection screen holder for displaying artworks, characterized in that, It includes a lifting mechanism (1), a curtain storage and adjustment mechanism (2), and a moving adjustment mechanism (3); The screen storage and adjustment mechanism (2) includes a horizontally arranged support base plate (21). A through-type sliding groove (22) is opened on the surface of the support base plate (21) along the length direction. A support frame (23) is fixedly installed on the surface of the support base plate (21). A bearing sleeve (24) is fixedly installed at the top of the support frame (23). A rotating handle (25) for easy manual operation is rotatably connected to the outer surface of the support base plate (21). A first gear (26) is rotatably connected to the surface of the rotating handle (25). One end of a chain belt (27) is sleeved on the surface of the first gear (26). A second gear (28) is sleeved on the other end of the chain belt (27). A screen roller (29) is fixedly connected to the outer side of the second gear (28). A projection screen (210) is wrapped around the surface of the screen roller (29). A support frame (211) for keeping the screen flat is fixedly installed at the bottom end of the projection screen (210).
2. The adjustable height projection screen holder for artwork display as described in claim 1, characterized in that, The two ends of the support frame (211) are symmetrically fixedly connected with slots (212). The slots (212) and the plate (213) form a detachable snap-fit engagement. The slots (212) are adapted to snap-fit into the inner side of the plate (213). The plate (213) is vertically fixedly installed on the upper surface of the slider (214). The slider (214) and the slide groove (22) form a sliding guide engagement. The slider (214) is adapted to slide snap-fit into the inside of the slide groove (22). The sliding direction of the slider (214) is consistent with the unfolding direction of the projection screen (210).
3. The adjustable height projection screen holder for artwork display as described in claim 1, characterized in that, The lifting mechanism (1) includes a base (11) for providing stable support and a hydraulic rod (12) vertically installed on the upper surface of the base (11). The hydraulic rod (12) is provided in at least four sets and is symmetrically distributed. The top of the hydraulic rod (12) is fixedly connected to the lower surface of the support base plate (21). The support base plate (21) is driven to rise and fall in the vertical direction by the extension and retraction of the hydraulic rod (12).
4. The adjustable height projection screen holder for artwork display as described in claim 2, characterized in that, The movable adjustment mechanism (3) includes a fixed block (31), which is fixedly connected to the bottom end of the support base plate (21). There are two sets of fixed blocks (31). Rotating screws (32) are rotatably connected to the inner side of the two sets of fixed blocks (31). Moving bushings (33) are rotatably sleeved on the surface of the rotating screws (32). Moving frames (34) are fixedly connected to both ends of the moving bushings (33). The moving frames (34) are L-shaped. The top end of the moving frames (34) is integrally formed into a receiving frame (35). The receiving frame (35) is slidably engaged inside the slide groove (22). The top end of the receiving frame (35) is connected to the slider (214). One end of the rotating screw (32) extends to the outside of the fixed block (31) and is fixedly connected to a handle (36). By rotating the handle (36), the rotating screw (32) is driven to rotate, thereby moving the receiving frame (35).
5. The adjustable height projection screen holder for artwork display as described in claim 2, characterized in that, The two ends of the slider (214) are concave, and the two ends of the slider (214) are engaged in the inner plate of the groove (22).
6. The adjustable height projection screen holder for artwork display as described in claim 1, characterized in that, The first gear (26) is connected to the second gear (28) via a chain (27). The second gear (28) is connected to the curtain roller (29). The rotation of the second gear (28) drives the curtain roller (29) to rotate.