Reinforcing steel semi-finished product tower type three-dimensional storage and intelligent transfer system

Abstract

This invention discloses a tower-type three-dimensional storage and intelligent transfer system for semi-finished steel bars, belonging to the field of semi-finished steel bar storage technology. The invention includes a vertically fixed three-dimensional frame above the ground. A drive motor is fixedly installed on the frame, and sprockets are symmetrically rotatably mounted on the frame. The shafts of both sprockets are connected to the output end of the drive motor. A conveyor chain is connected to the outer side of the sprockets, and the conveyor chain transports materials on the three-dimensional frame. Connecting members are evenly fixedly connected to the conveyor chain, and suspension frames are rotatably connected to the connecting members. A support base is rotatably connected between two suspension frames. A bracket is elastically and liftably mounted on the support base, and positioning clamps are evenly fixedly mounted on the shaft. This tower-type three-dimensional storage and intelligent transfer system for semi-finished steel bars allows for convenient loading and unloading of semi-finished steel bars and effectively ensures the stability of the semi-finished steel bars during vertical lifting, effectively reducing the risk of collapse.

Description

Technical Field

[0001] This invention relates to the field of steel bar semi-finished product storage technology, specifically a tower-type three-dimensional storage and intelligent transfer system for steel bar semi-finished products. Background Technology

[0002] In the field of construction engineering, steel bars, as core load-bearing components, need to be processed into semi-finished steel bars through processes such as cutting, bending, and threading before being put into on-site installation. With the improvement of the degree of industrialization in construction, the types (such as stirrups, main bars, and steel cages) and demand for semi-finished steel bars have increased significantly. Their storage and transportation have become key factors affecting construction efficiency, site utilization, and component quality. At present, the mainstream storage methods for semi-finished steel bars in the industry are mainly divided into two categories: one is the flat stacking method, which is to directly stack the semi-finished steel bars on the ground or on simple raised supports by dividing a fixed area on the construction site; the other is the simple multi-layer rack storage method, which uses a welded or assembled multi-layer frame structure to place the semi-finished steel bars in layers.

[0003] The prior art (Chinese patent No. CN221968026U, published on 2024-11-08) discloses a steel bar semi-finished product storage platform, including two longitudinal beams and a crossbeam fixed between the two longitudinal beams. A slider slides on the crossbeam, a crossbar is fixed on the slider, a vertical beam is engaged on the crossbar, a locking rod is inserted into the slider, a plurality of locking holes adapted to the locking rod are provided on the crossbeam, a sliding groove adapted to the crossbeam is provided at the bottom of the slider, an insertion hole adapted to the locking rod is provided on the slider, a plurality of grooves adapted to the vertical beam are provided on the crossbar, and the length of the vertical beam is 2m. This semi-finished steel bar storage platform ensures that the semi-finished steel bars do not deform or deviate from their original shape, and significantly shortens the construction cycle, improves the production efficiency of the steel bar processing plant, reduces construction costs, and can shorten the operation interruption time caused by insufficient storage capacity of the steel bar processing plant. Existing technology (Chinese patent announcement number: CN221455901U, publication date: 2024-08-02) discloses a mobile adjustable three-dimensional semi-finished steel bar storage rack, belonging to the field of bridge construction technology. It can solve the problems of the current complex types of precast box girder steel bars that are difficult to classify and store, and the excessive space occupied by storage. It includes two parallel crossbeams, with columns perpendicular to the crossbeams located in the middle of each crossbeam, and several longitudinal beams between the columns. The device features several brackets parallel to the crossbeam, with locking wheels at the bottom of the crossbeam. This design reduces the land use required for rebar processing plants, saving on land rental and construction costs. Existing technology (Chinese Patent No. CN209717686U, published on 2019-12-03) discloses a rebar cage storage rack for construction, comprising multiple connected storage units. Each storage unit includes a support frame, legs, and a positioning frame. The support frame includes a row of vertical main supports, horizontal main supports connected between adjacent vertical main supports, and vertical auxiliary supports spaced apart on top of the horizontal main supports. The bottom of the vertical main supports is lower than the plane of the bottom of the horizontal main supports. The legs are connected to the bottom of the horizontal main supports. The positioning frame is semi-circular, with its opening facing upwards, connecting between the vertical main supports and vertical auxiliary supports, as well as between adjacent vertical auxiliary supports. Horizontal auxiliary supports connect the rebar cage storage units. This rebar cage storage rack has a simple structure, is easy to manufacture, and enables the orderly storage of rebar cages.

[0004] While existing steel bar semi-finished product storage racks can reduce storage space by tiering them, the simple tiered rack structure makes it inconvenient to easily retrieve and place the steel bar semi-finished products. Furthermore, the tiered arrangement relies solely on fixed longitudinal beams to limit the movement of the steel bars, which poses a risk of collapse for the semi-finished products. Summary of the Invention

[0005] The purpose of this invention is to provide a tower-type three-dimensional storage and intelligent transfer system for semi-finished steel bars, in order to solve the problems mentioned in the background art, such as the inconvenience of storing semi-finished steel bars in the market, the inability to conveniently pick up and put away semi-finished steel bars, and the risk of collapse of semi-finished steel bars due to the reliance on fixed longitudinal beams to limit the position of steel bars during the layered placement process.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A tower-type three-dimensional storage and intelligent transfer system for semi-finished steel bars includes a three-dimensional frame vertically fixed above the ground. A drive motor is fixedly installed on the three-dimensional frame, and sprockets are symmetrically rotatably installed on the three-dimensional frame. The shafts of both sprockets are connected to the output end of the drive motor. A conveyor chain is connected to the outer side of the sprockets, and the conveyor chain transports materials on the three-dimensional frame. Connecting members are evenly fixedly connected to the conveyor chain, and suspension frames are rotatably connected to the connecting members. A support base is rotatably connected between the two suspension frames. A bracket is elastically and vertically installed on the support base, and a support wheel set is fixedly installed on the lower surface of the bracket. Longitudinal frames are symmetrically and evenly fixedly installed on the front and rear sides of the bracket. A positioning component for limiting the placement position of the semi-finished steel bars is installed between the rightmost longitudinal frame and the bracket. A shaft is rotatably connected to the longitudinal frames on both sides of the bracket, and positioning clamps for limiting the position of the semi-finished steel bars are evenly fixedly installed on the shafts. A transmission component for driving the shaft rotation is provided between the shaft and the support base.

[0008] Preferably, the suspension frame is U-shaped and inclined, and the support seat is raised and lowered by the connector and the suspension frame during the conveyor chain transport process.

[0009] Preferably, a buffer spring is fixedly connected between the support base and the bracket, and when the suspension frame moves the support base upward, the bracket moves elastically downward along the inner wall of the support base under the action of gravity, and the upper surface of the bracket is set in a V-shaped structure.

[0010] Preferably, the support wheel assembly includes a wheel frame fixedly installed on the lower surface of the bracket, and the wheel frame extends through the support base for lifting, and the lower end of the wheel frame is rotatably connected to a roller, while the roller is in contact with and supported on the ground when the support base moves to the bottom.

[0011] Preferably, the positioning component includes an adjusting motor fixedly installed on the outer side of the rightmost longitudinal frame, and a lead screw is fixedly installed on the output end of the adjusting motor. A positioning plate is threadedly connected to the outer side of the lead screw, and the lower end of the positioning plate is attached to the upper surface of the bracket. When the lead screw rotates, it drives the positioning plate to slide and adjust along the surface of the bracket.

[0012] Preferably, the transmission assembly includes a rack that is elastically and vertically mounted on a support base, and a gear is fixedly mounted on the outer side of the shaft, and the gear and the rack are meshed together.

[0013] Preferably, the transmission assembly further includes an adjustment seat fixedly installed on the outside of the support base, and a lifting column is installed on the inner side of the adjustment seat, and a return spring is fixedly connected between the adjustment seat and the lifting column.

[0014] Preferably, during the rotation of the shaft, the driving positioning clamp is attached to and clamped to the outside of the upper steel bar semi-finished product, and the positions of the positioning clamps on the two shafts are staggered.

[0015] Preferably, a baffle is elastically installed on the outer side of the left end of the bracket, and a fixed frame is fixedly installed on the right side of the support base. A steel cable is wound around the shaft of the baffle, and the upper end of the steel cable is fixedly connected to the upper end of the fixed frame. When the bracket slides inward toward the support base, the steel cable pulls the baffle to rotate and stand upright.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] This tower-type three-dimensional storage and intelligent transfer system for semi-finished steel bars can conveniently pick up and put away semi-finished steel bars, and can effectively ensure the stability of the placement of semi-finished steel bars during vertical lifting, effectively reducing the risk of collapse. The specific details are as follows;

[0018] 1. Equipped with a drive motor, sprocket, conveyor chain, and support base, the drive motor drives the sprocket to rotate, which in turn drives the conveyor chain to transport materials on the three-dimensional frame. The conveyor chain, through connectors and suspension brackets, drives the support base to adjust its vertical position, ensuring stable layered placement while facilitating the loading and unloading of semi-finished steel bars.

[0019] 2. Equipped with a lead screw and positioning plate, the lead screw is rotated by a control motor, which in turn causes the positioning plate to slide on the surface of the bracket through the threaded connection. This allows for adjustment of the placement position for different lengths of semi-finished steel bars, ensuring the stability of the center of gravity.

[0020] Furthermore, a baffle is also provided. As the support base is raised, the bracket will slide down the inside of the support base, allowing the fixing frame to rotate by pulling the baffle with steel cables. The baffle after being erected can prevent the semi-finished steel bars from falling from the left side by accident. After the baffle is lowered, it is convenient to pick up and put down the semi-finished steel bars.

[0021] 3. Equipped with a shaft and a positioning clamp, as the support seat is lifted, it moves upward on the outside of the bracket. The rack engages with the gear, driving the gear to rotate the shaft. At this time, the shaft can rotate the positioning clamp closer to the top of the placed steel bar semi-finished product, further limiting the steel bar semi-finished product and preventing it from shaking or rolling. When the positioning clamp clamps the steel bar semi-finished product, the adjusting seat and the lifting column will elastically adjust their height to prevent the positioning clamp from applying excessive force to the steel bar semi-finished product and causing deformation. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the rear view structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the suspension frame and support structure of the present invention;

[0025] Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle;

[0026] Figure 5 This is a bottom view of the support structure of the present invention;

[0027] Figure 6 This is a schematic diagram of the positioning plate installation structure of the present invention;

[0028] Figure 7 This is a schematic cross-sectional view of the adjusting seat of the present invention;

[0029] Figure 8 This is a schematic diagram of the baffle installation structure of the present invention;

[0030] Figure 9 For the present invention Figure 8 Enlarged structural diagram at point B.

[0031] In the diagram: 1. Frame; 2. Drive motor; 3. Sprocket; 4. Conveyor chain; 5. Connector; 6. Suspension frame; 7. Support seat; 8. Bracket; 9. Buffer spring; 10. Wheel frame; 11. Roller; 12. Longitudinal frame; 13. Adjusting motor; 14. Lead screw; 15. Positioning plate; 16. Shaft; 17. Gear; 18. Adjusting seat; 19. Lifting column; 20. Return spring; 21. Rack; 22. Positioning clamp; 23. Baffle; 24. Steel cable; 25. Fixing frame. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1: Existing three-dimensional storage racks for semi-finished steel bars are inconvenient for loading and unloading semi-finished steel bars. To solve this technical problem, this example discloses the following technical content. Please refer to [link / reference]. Figures 1-3 and Figures 8-9 As shown; a tower-type three-dimensional storage and intelligent transfer system for semi-finished steel bars includes a three-dimensional frame 1 vertically fixed above the ground. A drive motor 2 is fixedly installed on the three-dimensional frame 1, and sprockets 3 are symmetrically rotatably installed on the three-dimensional frame 1. The shafts of both sprockets 3 are connected to the output end of the drive motor 2. A conveyor chain 4 is connected to the outer side of the sprockets 3, and the conveyor chain 4 transports materials on the three-dimensional frame 1. Connecting parts 5 are evenly fixedly connected to the conveyor chain 4, and suspension frames 6 are rotatably connected to the connecting parts 5. A support base 7 is rotatably connected between the two suspension frames 6. A bracket 8 is elastically lifted and installed on the support base 7, and a support wheel set is fixedly installed on the lower surface of the bracket 8. Longitudinal frames 12 are symmetrically and evenly fixedly installed on the front and rear sides of the bracket 8. The suspension frame 6 is arranged in a U-shape and is inclined as a whole. During the transport process of the conveyor chain 4, the materials are transported through the connecting parts. 5 and the suspension frame 6 drive the support seat 7 to adjust its height. A buffer spring 9 is fixedly connected between the support seat 7 and the bracket 8. When the suspension frame 6 drives the support seat 7 to move upward, the bracket 8 moves elastically downward along the inner wall of the support seat 7 under the action of gravity. The upper surface of the bracket 8 is set with a V-shaped structure. The support wheel set includes a wheel frame 10 fixedly installed on the lower surface of the bracket 8. The wheel frame 10 moves through the support seat 7 and the lower end of the wheel frame 10 is rotatably connected to a roller 11. When the support seat 7 moves to the bottom, the roller 11 is attached to the ground. A baffle 23 is elastically installed on the outer side of the left end of the bracket 8. A fixing frame 25 is fixedly installed on the right side of the support seat 7. A steel cable 24 is wound around the shaft of the baffle 23. The upper end of the steel cable 24 is fixedly connected to the upper end of the fixing frame 25. When the bracket 8 slides inward to the support seat 7, the steel cable 24 pulls the baffle 23 to rotate and stand upright.

[0034] When it is necessary to pick up or put down the semi-finished steel bars, the drive motor 2 is controlled to drive the sprocket 3 to rotate through the transmission structure. The sprocket 3 drives the conveyor chain 4 on its outer side to rotate and convey the steel bars on the three-dimensional frame 1. The support seat 7 can be raised and lowered through the connector 5 and the suspension frame 6. When the support seat 7 moves to the lowest position, the roller 11 will contact the ground to provide support. At this time, the support seat 7 will move down on the outside of the bracket 8, causing the baffle 23 to rotate and tilt, which makes it easier to pick up the semi-finished steel bars on the bracket 8. After the semi-finished steel bars are picked up or placed, the drive motor 2 is controlled to drive the sprocket 3 to rotate again to lift the support seat 7. During the lifting process, the support seat 7 will move up along the outer wall of the bracket 8, thereby squeezing the buffer spring 9 to achieve a certain buffering effect and avoid shaking caused by excessive instantaneous load during the lifting process.

[0035] When storing semi-finished steel bars, they are transferred in the following way: Semi-finished product sorting: The finished semi-finished steel bars (stirrups, main bars, steel cages) are sent to the sorting area by roller conveyor. The sorting robot arm distinguishes the specifications by visual recognition (shape, size, weight, etc.), grabs them, stands them upright, and piles them up.

[0036] Rebar cage storage: The rebar cages are conveyed by roller conveyors to the turning device, where they are automatically turned into a special turnover rack (to prevent deformation). The AMR unmanned forklifts use laser navigation to move the turnover racks to the tower-type three-dimensional storage racks, which are arranged according to the "lifting sequence".

[0037] Categorized storage: The remaining semi-finished products are placed on a general turnover rack by a robotic arm, and the unmanned forklift moves them to the corresponding storage location (such as the 20mm steel bar area) according to system instructions. The electronic tag of the storage location is updated with information synchronously.

[0038] Outbound dispatch: When materials are needed on site, the system dispatches unmanned forklifts according to the "first-in, first-out" principle to move the turnover racks to the loading area and connect them with the transport vehicles.

[0039] Example 2: The technical content disclosed in this example is a further improvement based on Example 1. Most existing steel bar semi-finished product storage racks use a single fixed rod to limit the position of the steel bar semi-finished products, which has limited stability and increases the risk when stacking them in layers. To further solve this technical problem, this example discloses the following technical content: Figures 3-7As shown; a positioning component for limiting the placement of semi-finished steel bars is installed between the rightmost longitudinal frame 12 and the bracket 8. A shaft 16 is rotatably connected to the longitudinal frame 12 on both sides of the bracket 8, and a positioning clamp 22 for limiting the semi-finished steel bars is evenly fixed on the shaft 16. A transmission component for driving the shaft 16 to rotate is provided between the shaft 16 and the support base 7. The positioning assembly includes an adjusting motor 13 fixedly installed on the outer side of the rightmost longitudinal frame 12, and a lead screw 14 fixedly installed at the output end of the adjusting motor 13. A positioning plate 15 is threadedly connected to the outer side of the lead screw 14. The lower end of the positioning plate 15 is attached to the upper surface of the bracket 8. When the lead screw 14 rotates, it drives the positioning plate 15 to slide and adjust along the surface of the bracket 8. The transmission assembly includes a rack 21 elastically lifted and installed on the support seat 7, and a gear 17 is fixedly installed on the outer side of the shaft 16. The gear 17 and the rack 21 are meshed and connected. The transmission assembly also includes an adjusting seat 18 fixedly installed on the outer side of the support seat 7, and a lifting column 19 is lifted and installed on the inner side of the adjusting seat 18. A return spring 20 is fixedly connected between the adjusting seat 18 and the lifting column 19. During the rotation of the shaft 16, it drives the positioning clamp 22 to fit and clamp against the outer side of the upper steel bar semi-finished product. The positions of the positioning clamps 22 on the two shafts 16 are staggered.

[0040] Before placing the semi-finished steel bars, the adjusting motor 13 drives the lead screw 14 to rotate according to the placement length of the semi-finished steel bars. This allows the lead screw 14 to drive the positioning plate 15 to slide on the surface of the bracket 8 through the threaded connection. After adjustment, one end of the semi-finished steel bar is placed against the positioning plate 15 to ensure that the semi-finished steel bar can be placed in the center position of the bracket 8. This allows for adjustment of the placement position for different lengths of semi-finished steel bars, ensuring the stability of the placement center of gravity. As the support 7 is raised, the bracket 8 will slide down the inside of the support 7, allowing the fixing frame 25 to rotate by pulling the baffle 23 through the steel cable 24. The rear baffle 23 can prevent the semi-finished steel bars from accidentally falling from the left side. As the support seat 7 is lifted, the support seat 7 will move upward on the outside of the bracket 8. The rack 21 will mesh with the gear 17, thereby driving the gear 17 to drive the shaft 16 to rotate. At this time, the shaft 16 can drive the positioning clamp 22 to rotate and approach the upper part of the placed semi-finished steel bars, thereby further limiting the semi-finished steel bars and preventing them from shaking or rolling. When the positioning clamp 22 clamps the semi-finished steel bars, the adjusting seat 18 and the lifting column 19 will elastically adjust their height to prevent the positioning clamp 22 from applying too much force to the semi-finished steel bars and causing deformation.

[0041] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," 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 the invention 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 the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

Claims

1. A tower-type three-dimensional storage and intelligent transfer system for semi-finished steel bars, comprising a three-dimensional frame (1) vertically fixed above the ground, wherein a drive motor (2) is fixedly installed on the three-dimensional frame (1), and sprockets (3) are symmetrically rotated on the three-dimensional frame (1), and the shafts of the two sprockets (3) are connected to the output end of the drive motor (2) for transmission. A conveyor chain (4) is connected to the outside of the sprockets (3), and the conveyor chain (4) conveys the steel bars on the three-dimensional frame (1). The system is characterized in that: The conveyor chain (4) is uniformly fixedly connected with connectors (5), and the connectors (5) are rotatably connected with suspension frames (6). A support seat (7) is rotatably connected between the two suspension frames (6). A bracket (8) is elastically lifted and installed on the support seat (7). A support wheel set is fixedly installed on the lower surface of the bracket (8). Columns (12) are symmetrically and uniformly fixedly installed on the front and rear sides of the bracket (8). A positioning component for limiting the placement position of the steel bar semi-finished product is installed between the rightmost column (12) and the bracket (8). A shaft (16) is rotatably connected to the column (12) on both sides of the bracket (8). A positioning clamp (22) for limiting the position of the steel bar semi-finished product is uniformly fixedly installed on the shaft (16). A transmission component for driving the shaft (16) to rotate is provided between the shaft (16) and the support seat (7).

2. The tower-type three-dimensional storage and intelligent transfer system for semi-finished steel bars according to claim 1, characterized in that: The suspension frame (6) is U-shaped and inclined. During the conveying process, the conveyor chain (4) drives the support seat (7) to be raised and lowered through the connector (5) and the suspension frame (6).

3. The tower-type three-dimensional storage and intelligent transfer system for semi-finished steel bars according to claim 1, characterized in that: A buffer spring (9) is fixedly connected between the support base (7) and the bracket (8). When the suspension bracket (6) moves the support base (7) upward, the bracket (8) moves elastically downward along the inner wall of the support base (7) under the action of gravity. The upper surface of the bracket (8) is set in a V-shaped structure.

4. The tower-type three-dimensional storage and intelligent transfer system for semi-finished steel bars according to claim 1, characterized in that: The support wheel assembly includes a wheel frame (10) fixedly installed on the lower surface of the bracket (8), and the wheel frame (10) is lifted through the support seat (7), and the lower end of the wheel frame (10) is rotatably connected to a roller (11). At the same time, when the support seat (7) moves to the bottom, the roller (11) is attached to the ground.

5. The tower-type three-dimensional storage and intelligent transfer system for semi-finished steel bars according to claim 1, characterized in that: The positioning assembly includes an adjustment motor (13) fixedly installed on the outside of the rightmost longitudinal frame (12), and a lead screw (14) is fixedly installed at the output end of the adjustment motor (13). A positioning plate (15) is threadedly connected to the outside of the lead screw (14). The lower end of the positioning plate (15) is attached to the upper surface of the bracket (8). When the lead screw (14) rotates, it drives the positioning plate (15) to slide and adjust along the surface of the bracket (8).

6. The tower-type three-dimensional storage and intelligent transfer system for semi-finished steel bars according to claim 1, characterized in that: The transmission assembly includes a rack (21) that is elastically and vertically mounted on a support (7), and a gear (17) is fixedly mounted on the outside of the shaft (16), and the gear (17) and the rack (21) are meshed together.

7. The tower-type three-dimensional storage and intelligent transfer system for semi-finished steel bars according to claim 6, characterized in that: The transmission assembly also includes an adjustment seat (18) fixedly installed on the outside of the support seat (7), and a lifting column (19) is installed on the inner side of the adjustment seat (18), and a return spring (20) is fixedly connected between the adjustment seat (18) and the lifting column (19).

8. The tower-type three-dimensional storage and intelligent transfer system for semi-finished steel bars according to claim 6, characterized in that: During the rotation of the shaft (16), the driving positioning clamp (22) is attached to and clamped to the outside of the upper steel bar semi-finished product, and the positions of the positioning clamps (22) on the two shafts (16) are staggered.

9. The tower-type three-dimensional storage and intelligent transfer system for semi-finished steel bars according to claim 1, characterized in that: A baffle (23) is elastically installed on the outer side of the left end of the bracket (8), and a fixing frame (25) is fixedly installed on the right side of the support base (7). A steel cable (24) is wound around the shaft of the baffle (23), and the upper end of the steel cable (24) is fixedly connected to the upper end of the fixing frame (25). When the bracket (8) slides towards the inside of the support base (7), the steel cable (24) pulls the baffle (23) to rotate and stand upright.

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