Winding shaft capable of preventing center from drooping and windproof sunshade curtain

Abstract

The utility model discloses a reel capable of preventing center sagging and a windproof sunshade curtain, which are characterized in that the reel comprises a reel and a support shaft, the reel is of a hollow structure, and the reel is rotatably sleeved on the support shaft; the middle of the supporting shaft is provided with a bending part which is bent upwards, a supporting component is rotationally installed on the bending part, and the top of the supporting component abuts against the inner wall of the reel. According to the utility model, the use stability of the reel is improved, the shaking amplitude is reduced, and the device is also suitable for an ultra-long reel and has a wider application range.

Description

Technical Field

[0001] This utility model relates to a roller, and more particularly to a roller that prevents sagging from the center and a windproof sunshade. Background Technology

[0002] Curtains are made of materials such as cloth, linen, gauze, aluminum sheets, wood shavings, and metal, and serve the functions of sun shading, heat insulation, and regulating indoor light. Fabric curtains are categorized by material, including cotton gauze, polyester fabric, cotton-polyester blends, cotton-linen blends, and non-woven fabrics. Different materials, textures, colors, and patterns combine to create curtains of various styles, complementing different interior designs. Currently, motorized curtains are increasingly widely used. Motorized curtains are generally installed indoors or outdoors for sun shading, wind protection, and other purposes. In some scenarios involving large-scale or wide-width curtains, such as 5 meters, 10 meters, or even larger, extra-wide curtains are required. If the curtain roller is of the corresponding length, its own weight will cause it to bend downwards in the middle due to the weight of the curtain itself. This results in the curtain being unusable or having a poor appearance. This is especially true for long and wide curtains where the roller is also extra-long. Regardless of whether the roller is hollow or solid, the weight-to-length ratio is basically the same, leading to a sagging problem in the middle. This sagging in the middle of the roller results in an arc-shaped structure that is low in the middle and high at both ends. When the curtain (roller blind) is rolled up, it will converge towards the middle, resulting in a curtain that is thicker in the middle and thinner at the sides. This is extremely unsightly, and the roller will also wobble significantly when rolled up or down, or when exposed to outdoor winds.

[0003] To address the aforementioned technical problems, patent application number "201921281861.6," entitled "An Installation Structure for an Ultra-Wide Electric Curtain," uses a central plate in the middle of the roll to support it and prevent sagging. This effectively splits the roll into two, increasing the support point. While this structure solves the swaying problem, the curtain needs to be divided into multiple sections, connected by zippers. In practical use, the central zipper may jam during roll-up and unrolling. Especially in outdoor pergolas, strong winds can easily damage the central zipper, resulting in poor performance.

[0004] Therefore, it is difficult to achieve ultra-wide sunshades in existing structures. Generally, rollers longer than 6 meters tend to sag significantly from the center. Thus, ultra-wide sunshades typically do not exceed 6 meters (if an exceptionally wide shade is required, it is usually made by splicing together several sections, rather than creating a single, continuous shade). Using special steel would be extremely costly, have low consumer acceptance, and be impractical. Summary of the Invention

[0005] The purpose of this invention is to provide a roller and a windproof sunshade that prevents the roller from sagging. By using this structure, the sag of the roller can be effectively prevented and the strength of the roller can be improved.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is: a scroll to prevent center sagging, comprising a scroll and a support shaft, wherein the scroll has a hollow structure and is rotatably sleeved on the support shaft;

[0007] The support shaft has an upwardly curved section in the middle, and a support component is rotatably mounted on the curved section, with the top of the support component abutting against the inner wall of the reel.

[0008] In the above technical solution, the supporting component is rotatably connected to the bending part, and the supporting component is a ball, roller or swivel, with the top outer surface of the ball, roller or swivel abutting against the inner wall of the roll.

[0009] In the above technical solution, an intermediate tube is also sleeved between the support shaft and the reel, and the top of the support component abuts against the top surface of the inner wall of the intermediate tube;

[0010] And / or, the outer surface of the reel is further provided with a slot extending along the axial direction of the reel.

[0011] In the above technical solution, multiple support plates are arranged around the outer surface of both ends of the intermediate tube, and the outer edge of the support plates abuts against the inner wall of the roll.

[0012] In the above technical solution, a prestressed component is also provided on the support shaft. The prestressed component is located below the curved part, and both ends of the prestressed component are connected to the support shaft on both sides of the curved part.

[0013] In the above technical solution, a connector is provided at the bottom of the support shaft on both sides of the bending portion, and the two ends of the prestressed component are respectively connected to the two connectors.

[0014] In the above technical solution, the prestressed component includes two flexible connectors and an adjusting member. The outer ends of the two flexible connectors are respectively connected to one of the connectors, and the inner ends of the two flexible connectors are respectively connected to both ends of the adjusting member. The adjusting member adjusts the distance between the inner ends of the two flexible connectors.

[0015] In the above technical solution, the adjusting component includes an intermediate component and two hooks. The inner ends of the two hooks are respectively screwed to the two ends of the intermediate component, and the inner end of each flexible connector is respectively connected to the outer end of one hook.

[0016] And / or, the intermediate component is mounted on the bottom surface of the curved portion.

[0017] In the above technical solution, a bearing is also provided between the support shaft and the reel, and the reel is rotatably connected to the support shaft via the bearing.

[0018] This utility model also provides a windproof and sunshade curtain, including a curtain fabric and the aforementioned anti-center sagging roller, one end of which is connected to the roller.

[0019] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0020] 1. In this utility model, a support shaft is also provided in the middle of the scroll. The middle of the support shaft has an upwardly curved part, and the curved part is provided with a support part that contacts the inner wall of the scroll. When the scroll rotates, the curved part can provide an upward force to the middle of the scroll, which can effectively prevent the center of the scroll from sagging. Compared with the previous structure, the scroll can adopt a longer structure, and can also prevent the center from sagging, which effectively improves the scope of application and ensures the stability and aesthetics of use.

[0021] 2. In this utility model, the supporting component adopts a ball, roller or swivel that is rotatably connected to the bending part. When the swivel rotates, the supporting component and the swivel make rotatable contact, thereby ensuring the smoothness of the swivel rotation.

[0022] 3. In this utility model, the external force on the bending component is adjusted by the prestressed component, which can be adjusted according to the length of the roll, so that it can be applied to rolls of different lengths, so that the center of the longer roll does not sag or the sag is small, thus improving the applicability range.

[0023] 4. In this utility model, prestressed components can be omitted, and prestressed bending can be applied directly to the bending part, which can effectively ensure the stability and smoothness of the roller rotation, while preventing the roller from sagging and deforming in the middle. Attached Figure Description

[0024] Figure 1 This is a cross-sectional structural diagram of Embodiment 1 of this utility model;

[0025] Figure 2 yes Figure 1 A magnified view of the connection between the curved section and the scroll;

[0026] Figure 3 This is a schematic diagram of the bottom structure of the support shaft in Embodiment 1 of this utility model;

[0027] Figure 4 yes Figure 1 Schematic diagram of the cross-sectional structure at point AA;

[0028] Figure 5 This is a cross-sectional structural diagram of another embodiment of the present invention.

[0029] The components are: 1. Roller; 2. Support shaft; 3. Bending section; 4. Support component; 5. Bearing; 6. Slot; 7. Arc groove; 8. Connecting groove; 9. Protrusion; 10. Intermediate tube; 11. Support plate; 12. Prestressed component; 13. Connector; 14. Hanger; 15. Flexible connector; 16. Adjusting component; 17. Intermediate component. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0031] Example 1: See Figure 1-5 As shown, a scroll for preventing center sagging includes a scroll 1 and a support shaft 2. The scroll 1 has a hollow structure and is rotatably sleeved on the support shaft 2.

[0032] The support shaft 2 has an upwardly curved section 3 in the middle, and a support component 4 is rotatably mounted on the curved section 3. The top of the support component 4 abuts against the inner wall of the scroll 1.

[0033] In this embodiment, the roller is used for rolling up and down products, such as sunshades, curtains, windproof curtains, windproof sunshades, or other rollable materials. Normally, with the two ends of the roller supported and limited, the middle section will sag (an arc-shaped structure, low in the middle and high at both ends). The degree of sag varies depending on the length of the roller. If the roller is extra-long, for example, 8 meters long, the sag in the middle will be greater. Regardless of whether the roller is hollow or solid, the middle section will sag, especially when materials are mounted on top for rolling up and down, as the weight is greater and the sag in the center will be even greater. In this embodiment, the two ends of the support shaft are located outside the two ends of the roller. The roller is rotatably mounted outside the support shaft and is equipped with a separate motor or other drive mechanism to drive the roller to rotate on the support shaft. The two ends of the support shaft are fixed and do not rotate. Taking a windproof and sunshade curtain wound on a roller as an example, when the motor drives the roller to rotate, it causes the roller to rotate on the support shaft. Under normal circumstances, if the middle of the support shaft is not set with a bend, the middle of the support shaft and the middle of the roller will sag. The sag of the center of the roller is basically the same as the sag of a single roller (without a support shaft), because the middle of the support shaft will also sag. In this embodiment, the support shaft has an upward-curving section in the middle, on which a support component is rotatably mounted. The top outer surface of the support component abuts against the inner wall of the roll. Since the curved section itself is upward-curving, when the middle of the roll is subjected to its own weight and deforms downwards, this bending force is transmitted to the support component and the curved section. Because the curved section arches upwards, it transmits this upward force through the support component to the inner wall of the middle of the roll, thus counteracting the downward sag force in the middle of the roll. This prevents the middle of the roll from sagling, or at least minimizes the sag, ensuring it doesn't affect the aesthetics of the roll during use and minimally impacts the normal winding and unwinding of materials, guaranteeing stable winding and preventing material deviation. If the center of the roll sags excessively, meaning the sag arc is large when the roll is laid flat, the material will converge towards the sag center during winding, resulting in uneven winding. When unrolling, excessive sag from the center of the roller results in uneven unrolling of the material, creating an upward-opening V-shaped fold, as seen in roller blinds or windproof sunshades. In particular, the ends of windproof sunshades may move along the posts (e.g., application number "202021934957.0", patent title "An Ultra-Wide Sunshade Curtain"; application number "201921281861.6", patent title "An Ultra-Wide Electric Curtain Installation Structure"). This means that the posts limit the movement of the windproof sunshade, causing uneven tension on both sides, making it prone to damage. Therefore, in this embodiment, a curved section with an upward-curving center is incorporated inside the roller to effectively prevent or reduce sag in the center, ensuring aesthetics and the quality of unrolling and rewinding.Especially when the reel rotates to wind up and unwind materials, the sway of the reel is much smaller. (If the center is drooping, during the winding process, the center of the reel is always bent downwards. When the reel rotates, the part that was originally at the bottom of the reel will rotate 360 ​​degrees, changing its position. Especially after a long period of drooping, the reel may deform into a relatively fixed posture. When the reel rotates, it causes the originally downward-bent deformation part to rotate upwards and then downwards, resulting in a larger sway of the reel. Moreover, if the reel deforms into a relatively fixed arc shape, during use, if the reel stops at a position where the deformation part is not exactly at the bottom, but at the front, back, or top, the reel will slowly deform into a drooping arc shape. Materials often undergo this deformation, and the deformation is large, making them prone to damage. Therefore, in this invention, the reel basically does not deform, or the deformation is small, and the service life is longer.)

[0034] The supporting component 4 is rotatably connected to the bending part 3. The supporting component 4 is a ball, roller or swivel, and the top outer surface of the ball, roller or swivel abuts against the inner wall of the scroll 1.

[0035] The support component uses balls, rings, or rollers. When the spool rotates, its middle part can roll into contact with the support shaft through the support component, reducing rigid friction and thus ensuring the smoothness and stability of the spool rotation. In this embodiment, the support component uses balls, which are rotatably connected to the curved part. The top outer surface of the balls is located above the top of the curved part, and the balls are located at the highest point of the curved part. The balls can be bearings.

[0036] To ensure smooth rotation of the spool and the support shaft, a bearing 5 is provided between the support shaft 2 and the spool 1, and the spool 1 is rotatably connected to the support shaft 2 via the bearing 5.

[0037] In this embodiment, bearings are located at both ends of the reel, and the curved part is located between the two bearings. When the reel rotates, the two ends are rotatably connected to the support shaft through the bearings, while the middle part is in rolling contact with the curved part through the support component, which effectively ensures the stability and smoothness of the reel rotation.

[0038] See Figure 4As shown, the outer surface of the roller 1 is also provided with a groove 6 extending along the axial direction of the roller 1. The groove is used to limit the end of the windproof sunshade curtain, thereby ensuring that the windproof sunshade curtain can be rolled up and unrolled when the roller rotates, and that the windproof sunshade curtain will not detach from the groove. Preferably, the groove 6 includes an arc-shaped groove 7 and a connecting groove 8 that are interconnected. The diameter of the arc-shaped groove is larger than the width of the connecting groove. The two ends of the connecting groove are respectively connected to one side of the arc-shaped groove and the outer wall of the roller. The end of the windproof sunshade curtain has a snap-fit ​​component that snaps into the arc-shaped groove. The windproof sunshade curtain passes through the connecting groove and is located outside the roller. In this structure, when the roller rotates, it can drive the windproof sunshade curtain to be rolled onto the roller or released from the roller.

[0039] To reduce the material used in the reel, resulting in a thinner wall, the slot is recessed into the reel (equivalent to a raised strip). This makes the inner surface of the reel insufficient to form a regular circular structure; that is, there is a recessed raised strip 9 at the circular structure. In this structure, when the reel rotates on the support shaft, this raised strip will be stuck when it reaches the support component. Therefore, see... Figure 3 As shown, an intermediate tube 10 is also sleeved between the support shaft 2 and the scroll 1, and the top of the support component 4 abuts against the top surface of the inner wall of the intermediate tube 10. A plurality of support pieces 11 are arranged around the outer surfaces of both ends of the intermediate tube 10, and the outer edges of the support pieces 11 abut against the inner wall of the scroll 1.

[0040] In this method, the intermediate tube contacts the inner wall of the spool via support plates, ensuring coaxial alignment between the intermediate tube and the spool. The support plates, particularly the protrusions at the slots, are positioned between adjacent support plates. Therefore, when the spool rotates, the protrusions at the slots, being inside the spool, also rotate and abut against the two support plates at both ends of the intermediate tube. This simultaneously drives the support plates and the intermediate tube to rotate, making the intermediate tube, support plates, and spool a unified whole that rotates together. Thus, during spool rotation, the support components abut against the intermediate tube, and the spool makes rolling contact with the support components (ball bearings) through the intermediate tube. This method also prevents direct contact between the ball bearings and the spool, preventing wear and extending the spool's lifespan. Even if the intermediate tube is damaged, only the intermediate tube needs to be replaced. In this invention, the length of the intermediate tube can be relatively short, just enough to completely cover the support part. However, for assembly purposes and to prevent the intermediate tube from shifting and detaching from the support component, the length of the intermediate tube can be slightly longer, so that even if the intermediate tube moves axially a certain distance, the support component will always remain against the inner wall of the intermediate tube. The outer surface of the bearing will have a groove to accommodate the protruding strip.

[0041] In another embodiment, if the wall thickness of the spool exceeds the depth of the slot, the intermediate tube can be omitted; however, this would increase the cost of the spool. Alternatively, a separate intermediate tube can be used without a support plate. In this structure, the support component and the intermediate tube roll in contact, preventing direct contact between the support component and the spool. This prevents wear and deformation at the contact point between the spool and the support component, ensuring stability, aesthetics, and service life.

[0042] In another embodiment, instead of directly setting a slot on the outer surface of the roll, a raised strip component is provided, and the slot is set on the raised strip component. The end of the windproof sunshade is directly connected to the raised strip component. In this way, the intermediate tube can also be omitted, and the support component can directly abut against the inner wall of the roll.

[0043] See Figure 2 , 3 As shown, a prestressed component 12 is also provided on the support shaft 2. The prestressed component 12 is located below the bending part 3, and both ends of the prestressed component 12 are connected to the support shaft 2 on both sides of the bending part 3.

[0044] In this invention, the support shaft has an upward-curving section in the middle. Therefore, the support shaft is also an arc-shaped structure with the middle arched upward. During use, the two ends of the support shaft are fixed, and the middle section will sag due to gravity. In particular, when the spool is rotated and mounted on the support shaft, the middle section of the spool will exert downward pressure on the curved section. Over time, the curved section will also deform downward, causing the middle section of the spool to sag and bend. Therefore, in this embodiment, a prestressing component is installed on the support shaft below the curved section. The prestressing component is applied to the support shaft on both sides of the curved section, so that the curved section is always subjected to the tension of the prestressing component and always bends upward without sag. This ensures that the curved section can always provide upward prestress to the middle section of the spool, effectively preventing the middle section of the spool from sag and bend.

[0045] See Figure 2 , 3 As shown, a connector 13 is provided at the bottom of the support shaft 2 on both sides of the bending portion 3, and both ends of the prestressed component 12 are connected to the two connectors 13 respectively. The support shaft and the end of the prestressed component are connected by the connectors. In this embodiment, both the roller and the support shaft are made of metal materials, using steel. The connector is preferably also made of steel plate, which is welded and fixed to the support shaft. A hole is provided at the inner end of the steel plate, and the end of the prestressed component is directly connected to the hole in the steel plate.

[0046] See Figure 2 , 3As shown, the prestressed component 12 includes two flexible connectors 15 and an adjusting component 16. The outer ends of the two flexible connectors 15 are respectively connected to one connector 13, and the inner ends of the two flexible connectors 15 are respectively connected to the two ends of the adjusting component 16. The adjusting component 16 adjusts the distance between the inner ends of the two flexible connectors 15.

[0047] The adjusting member 16 includes an intermediate component 17 and two hooks 14. The inner ends of the two hooks 14 are respectively screwed to the two ends of the intermediate component 17. The inner end of each flexible connector 15 is respectively connected to the outer end of one hook 14.

[0048] In this embodiment, the flexible connector is a steel wire rope, and the intermediate component is a strip ring. A screw hole is provided at each end of the strip ring, with the inner end of the screw hole communicating with the inner wall of the strip ring. The outer surface of the inner end of the hanger has an external thread that connects to the screw hole. The outer end of the steel wire rope connects to the corresponding connector, and the inner end connects to the outer end of the hanger. In this way, by rotating the hanger, the distance between the outer end of the hanger and the strip ring can be adjusted, thereby pulling the distance between the two sets of connectors. The distance between the two sets of connectors is less than the length of the curved section itself. When the two sets of connectors need to be pulled closer, the hanger rotates, causing the outer end of the hanger to approach the strip ring. Therefore, the distance between the two sets of connectors decreases, causing the curved section to arch further upwards (the support shaft is a hollow tubular structure with a certain elastic deformation capacity), resulting in a higher arch height. If the connector is rotated and its outer end is moved away, the bending part will, due to its own restoring force, push the bending part back a certain distance and cause the top of the bending part to droop a little, resulting in a smaller arch angle. This method allows for easy adjustment of the arch angle of the bending part, thus adjusting its support force on the middle of the reel. The arch angle and support force can be adjusted according to the required length of the reel to suit reels of different lengths, and it is particularly suitable for extra-long reels.

[0049] Furthermore, the outer end of the hook has a hook ring that is rotatably connected to the hook, and the inner end of the wire rope is connected to the hook ring. In this way, when the hook and the intermediate component are screwed together to adjust the position, the hook ring will not rotate with the hook, thereby preventing the wire rope from rotating and preventing the wire rope from twisting or breaking.

[0050] Furthermore, the intermediate component is mounted on the bottom surface at the very center of the curved section. This arrangement ensures the flexible connector is positioned as close as possible to the bottom surface of the curved section, preventing the curved section and prestressed component from forming an arc structure and occupying less space. When the reel is sleeved on the support shaft, the inner surface of the reel will not contact the prestressed component, preventing mutual friction between the reel and the prestressed component. More preferably, the intermediate component will not be inserted into the intermediate tube; most of the flexible connector is located inside the intermediate tube. The connector will not contact the intermediate tube, nor will the flexible connector contact the inner wall of the intermediate tube. This prevents the intermediate tube from rubbing against the prestressed component when it rotates with the reel, thus preventing wear and breakage of the flexible connector.

[0051] If the support component uses a swivel (or bearing), the top of the inner surface of the swivel is connected to the top surface of the bend, and there is a gap between the bottom of the inner surface of the swivel and the bottom surface of the bend. The middle part of the adjusting component is inserted inside the swivel, without affecting the normal rotation of the swivel.

[0052] In another embodiment, the prestressed component is directly constructed using a single flexible connector, i.e., a steel wire rope. Both ends of the wire rope are connected to the support shafts on both sides of the bend, and the ends of the wire rope are directly welded to the support shafts. Furthermore, a limiting ring is provided on the bend, with the middle of the wire rope passing through the limiting ring. In this method, the required bending angle of the bend is pre-designed and adjusted, and then the bend is pre-bent before welding the wire rope. The limiting ring ensures that the wire rope is as close as possible to the bend. In this structure, the bending angle of the bend cannot be adjusted or is inconvenient to adjust subsequently.

[0053] In this utility model, as another embodiment, see [reference needed]. Figure 5As shown, prestressed components can also be omitted, with the bending section directly prestressed. The support shaft is a hollow steel pipe structure, with the middle of the steel pipe bent directly. The bent section has prestress, making the height of the entire bent support shaft greater than the inner diameter of the reel. Due to its elastic deformation capability, it is then directly inserted into the reel, so that the prestressed arch of the bent section presses against the top inner wall of the center of the reel, preventing the middle of the reel from sagging. (In this structure, the inside of the reel does not have an inward groove; the inner surface of the reel is a complete cylindrical structure, and the support component adopts...) Using a swivel ring located at the highest point of the arch in the bend eliminates the need for an intermediate tube. Furthermore, to ensure better prestress in the bend, the diameter and wall thickness of the support shaft are larger than in Embodiment 1 (the thicker the wall and the larger the diameter, the stronger the prestress resistance to deformation after bending). In this embodiment, the swivel ring provides a large contact area with the reel, effectively preventing wear at the contact point and reducing noise, while also ensuring smoother reel rotation. Of course, by adding a prestressing component to this embodiment, long-term pressure deformation during bending can be further prevented, effectively preventing sagging in the middle of the reel, resulting in greater stability and a longer lifespan. Alternatively, the bend in Embodiment 1 can also employ a prestressed bending structure, consistent with this embodiment.

[0054] This utility model also provides a windproof and sunshade curtain, including a curtain fabric and the aforementioned anti-sag roller, one end of which is connected to the roller. A motor is also provided, with both ends of a support shaft fixedly mounted on a column. The motor is mounted on the column and drives the roller to rotate.

[0055] In this embodiment, the end of the curtain is connected to the slot of the roller. In this structure, the width of the curtain can be set to be larger, such as an extra-large windproof sunshade curtain with a width of 6-15m. It is aesthetically pleasing, and when the curtain is rolled up and down, it can be stably and accurately rolled up on the roller without deviation during rolling or unrolling, and without wrinkles. At the same time, there is basically no shaking or very little shaking during the rolling up and unrolling process.

[0056] In the description of this utility model, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0057] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. For instance, the two components can be mechanically connected by abutting or contacting each other; they can also be directly hung or connected by an intermediate medium; or they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

Claims

1. A scroll that prevents center sagging, characterized in that: It includes a spool and a support shaft, wherein the spool has a hollow structure and is rotatably sleeved on the support shaft; The support shaft has an upwardly curved section in the middle, on which a support member is mounted, and the top of the support member abuts against the inner wall of the reel.

2. The anti-sagging scroll according to claim 1, characterized in that: The supporting component is rotatably connected to the bending part. The supporting component is a ball, roller, or ring, and the top outer surface of the ball, roller, or ring abuts against the inner wall of the scroll.

3. The anti-sagging scroll according to claim 1, characterized in that: An intermediate tube is also sleeved between the support shaft and the reel, and the top of the support component abuts against the top surface of the inner wall of the intermediate tube; And / or, the outer surface of the reel is further provided with a slot extending along the axial direction of the reel.

4. The anti-sagging scroll according to claim 3, characterized in that: Multiple support plates are arranged around the outer surfaces of both ends of the intermediate tube, and the outer edges of the support plates abut against the inner wall of the roll.

5. The anti-sagging scroll according to claim 1, characterized in that: The support shaft is also provided with a prestressed component, which is located below the bend. The two ends of the prestressed component are respectively connected to the support shaft on both sides of the bend.

6. The anti-sagging scroll according to claim 5, characterized in that: A connector is provided at the bottom of the support shaft on both sides of the bending section, and the two ends of the prestressed component are respectively connected to the two connectors.

7. The anti-sagging scroll according to claim 6, characterized in that: The prestressed component includes two flexible connectors and an adjusting member. The outer ends of the two flexible connectors are respectively connected to one of the connectors, and the inner ends of the two flexible connectors are respectively connected to both ends of the adjusting member. The adjusting member adjusts the distance between the inner ends of the two flexible connectors.

8. The anti-sagging scroll according to claim 7, characterized in that: The adjusting component includes an intermediate component and two hooks. The inner ends of the two hooks are respectively screwed to the two ends of the intermediate component. The inner end of each flexible connector is respectively connected to the outer end of one hook. And / or, the intermediate component is mounted on the bottom surface of the curved portion.

9. The anti-sagging scroll according to claim 1, characterized in that: A bearing is also provided between the support shaft and the reel, and the reel is rotatably connected to the support shaft via the bearing.

10. A windproof and sunshade curtain, comprising a curtain fabric, characterized in that: It also includes a roller for preventing center sagging as described in any one of claims 1-9, wherein one end of the curtain is connected to the roller.

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