A telescopic adjustable detachable device for reinforcing aluminum form of stair

Abstract

The application belongs to the technical field of building, and discloses a telescopic adjusting detachable device for reinforcing a stair aluminum mold; the device comprises a stair aluminum mold main body and two back spars, and the two back spars are fixedly installed on the stair aluminum mold main body. The first step plate, the plurality of second step plates and the third step plate are arranged above the stair aluminum mold through the step plate assembly, so that the stair aluminum mold is prevented from being scratched or deformed due to impact, the stair aluminum mold is protected, the stability of the stair aluminum mold is enhanced by arranging the step plate, the service life of the stair aluminum mold is prolonged, the bolt connecting the step plate assembly and the quadrilateral frame is removed when the device needs to be removed, the step plate assembly can be stacked due to the rotation of the telescopic assembly, the device does not need to be completely removed, the quadrilateral frame is removed from the back spar, the quadrilateral frame can be folded into an elongated strip-shaped long strip without being removed, and the device does not occupy a large space and is convenient to store.

Description

Technical Field

[0001] This invention relates to the field of building technology, and more specifically, to a telescopic, adjustable, and detachable device for reinforcing aluminum formwork for staircases. Background Technology

[0002] Staircase aluminum formwork, also known as staircase aluminum alloy formwork, is a new type of formwork material that has gradually become popular in the construction industry in recent years. It is mainly made of aluminum alloy and has many advantages such as being lightweight, high-strength, corrosion-resistant, easy to process, and reusable. The use of aluminum formwork systems has greatly improved construction speed, reduced labor intensity, and can form a smooth, right-angled concrete surface for stairs.

[0003] Long-term use of aluminum formwork for stairs can lead to the following problems: Material fragility: Although aluminum alloy is lightweight and has moderate hardness, it is more prone to scratches or deformation due to impact than steel; Wear at joints: The connection between formwork is mostly made of bolts, and long-term disassembly and assembly can cause thread wear, affecting the stability of the connection; Strength reduction: Long-term stress and environmental influences may cause the strength of aluminum formwork to decrease, especially when it is reused. Summary of the Invention

[0004] To address the problems of material fragility, wear at joints, and strength attenuation in the prior art, this invention proposes a retractable, adjustable, and detachable device for reinforcing aluminum formwork for staircases.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a telescopic, adjustable, and detachable device for reinforcing stair aluminum formwork, comprising a stair aluminum formwork body and two back ribs, the two back ribs being fixedly installed on the stair aluminum formwork body, a plurality of quadrilateral frames being provided between the two back ribs, and step plate assemblies being provided on the quadrilateral frames, further comprising:

[0006] An angle adjustment component is provided on a quadrilateral frame. The angle adjustment component is used to adjust the angle of each side of the quadrilateral frame.

[0007] A position adjustment component is installed on the step plate assembly, which is used to adjust the installation position of the step plate assembly and the quadrilateral frame.

[0008] Furthermore, the quadrilateral frame includes two first connecting plates and two second connecting plates, with two connecting rods rotatably connected between each of the two first connecting plates and the two second connecting plates. A first strip opening is provided on the back rib, and the two first connecting plates are respectively fixedly installed to the corresponding back rib by first bolts and first nuts.

[0009] Furthermore, the step plate assembly includes a first step plate, a plurality of second step plates and a third step plate. Four fixing plates are fixedly connected to one side wall of the first step plate, one side wall of the third step plate and two side walls of the second step plate. Adjacent first step plates, second step plates and third step plates are connected by fixing plates and telescopic components.

[0010] Furthermore, each of the first, second, and third step plates has two second strip-shaped openings, and a movable plate is slidably connected inside the second strip-shaped opening. The connecting rod has a third strip-shaped opening, and the connecting rod is fixedly installed to the first, second, and third step plates by the movable plate, the second bolt, and the second nut.

[0011] Furthermore, the angle adjustment assembly includes two movable blocks slidably connected to the first connecting plate, a first spring fixed between the two movable blocks, a limiting rack fixed on the movable block, and multiple toothed grooves opened at both ends of the connecting rod, with the limiting rack meshing with the toothed grooves.

[0012] Furthermore, a threaded rod is rotatably connected to the first connecting plate, a knob is fixedly connected to one end of the threaded rod, a rectangular plate is threadedly connected to the surface of the threaded rod, two guide rods that slide through the rectangular plate are fixedly connected to the first connecting plate, an extrusion plate is fixedly connected to the rectangular plate, an arc surface is provided on the moving block, and the two side walls of the extrusion plate abut against the arc surfaces of the two moving blocks.

[0013] Furthermore, the telescopic assembly includes a rotating block rotatably connected between fixed plates. The rotating block has a contraction groove, and a sliding column is slidably inserted between two corresponding contraction grooves. The sliding column has a first cavity, and a movable column is slidably inserted on the sliding column. One end of the movable column is fixedly connected to a horizontal plate slidably connected in the first cavity. A second spring is fixedly connected between the horizontal plate and the inner wall of the first cavity. Insert plates are fixedly connected to both ends of the horizontal plate. The inner wall of the contraction groove has multiple slots, and the insert plate is inserted into one of the slots.

[0014] Furthermore, the position adjustment assembly includes a rectangular slot formed on the second strip opening, the movable plate is slidably connected in the rectangular slot, the movable plate has a second cavity, a rotating column is threadedly connected to the movable plate, a rotating block is fixedly connected to one end of the rotating column, a cross groove is formed on the rotating block, an extrusion block located in the second cavity is fixedly connected to the outer wall of the rotating column, an insertion rod that contacts the extrusion block is slidably inserted in the movable plate, a third cavity is formed in the movable plate, a circular plate is fixedly connected to the outer wall of the insertion rod, a third spring is fixedly connected between the inner wall of the third cavity and the circular plate, and multiple insertion holes are formed on the side wall of the rectangular slot, the insertion rod is inserted into one of the insertion holes.

[0015] The technical effects and advantages of the present invention regarding a retractable, adjustable, and detachable device for reinforcing aluminum formwork for stairs are as follows:

[0016] (1) By setting up the step plate assembly, the first step plate, multiple second step plates and the third step plate are set on the top of the stair aluminum formwork, which avoids scratches or deformation of the stair aluminum formwork due to impact, and protects the stair aluminum formwork. In addition, setting up the step plate can enhance the stability of the stair aluminum formwork and extend the service life of the stair aluminum formwork. By setting up the quadrilateral frame and the telescopic assembly, when the device needs to be removed, only the bolts connecting the step plate assembly and the quadrilateral frame need to be removed. Since the telescopic assembly can rotate, the step plate assembly can be stacked without complete removal. The quadrilateral frame can be detached from the back rib and folded into a long and thin strip without removal, which does not take up much space and is easy to store.

[0017] (2) By setting an angle adjustment component, when it is necessary to change the angle between the four connecting rods of the quadrilateral frame, the rotating knob drives the threaded rod to rotate, and the threaded rod drives the rectangular plate and the extrusion plate to move, so that the extrusion plate does not contact the two moving blocks. Under the action of the first spring, the two limit racks leave the tooth groove, so that the connecting rod can rotate relative to the first connecting plate and the second connecting plate, thereby achieving the purpose of adjusting the angle of the connecting rod of the quadrilateral frame. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the main structure of the aluminum formwork staircase in this invention;

[0020] Figure 3 This is a schematic diagram of the first step plate structure in this invention;

[0021] Figure 4 This is a schematic diagram of the quadrilateral frame structure in this invention;

[0022] Figure 5 This is a schematic diagram of the angle adjustment component in the present invention;

[0023] Figure 6 This is a schematic diagram of the telescopic component structure in this invention;

[0024] Figure 7 This is a cross-sectional view of the movable plate in this invention;

[0025] Figure 8 For the present invention Figure 3 Enlarged diagram of point A in the middle.

[0026] In the picture:

[0027] 1. Staircase aluminum formwork main body; 2. Back rib; 3. Quadrilateral frame; 4. Tread plate assembly; 5. First connecting plate; 6. Second connecting plate; 7. Connecting rod; 8. First slot; 9. First bolt; 10. First nut; 11. First tread plate; 12. Second tread plate; 13. Third tread plate; 14. Fixing plate; 15. Telescopic assembly; 16. Second slot; 17. Moving plate; 18. Third slot; 19. Second bolt; 20. Second nut; 21. Moving block; 22. First spring; 23. Limiting rack; 24. Tooth groove; 25. Threaded rod; 26. Rectangular plate; 27. Guide rod; 28. Extrusion plate; 29. ​​Rotating block; 30. Shrinkage groove; 31. Sliding column; 32. First cavity; 33. Moving column; 34. Horizontal plate; 35. Second spring; 36. Insert plate; 37. Slot; 38. Second cavity; 39. Rotating column; 40. Rotating block; 41. Extrusion block; 42. Insert rod; 43. Third cavity; 44. Circular plate; 45. Third spring; 46. Insertion hole; 47. Rectangular groove. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0029] Reference Figure 1 and Figure 2 A retractable, adjustable, and detachable device for reinforcing aluminum formwork for stairs includes a stair formwork body 1 and two back ribs 2. The two back ribs 2 are fixedly installed on the stair formwork body 1. A plurality of quadrilateral frames 3 are provided between the two back ribs 2. Step plate assemblies 4 are provided on the quadrilateral frames 3. The device also includes:

[0030] An angle adjustment component is provided on the quadrilateral frame 3. The angle adjustment component is used to adjust the angle of each side of the quadrilateral frame 3.

[0031] A position adjustment component is installed on the step plate assembly 4. The position adjustment component is used to adjust the installation position of the step plate assembly 4 and the quadrilateral frame 3. In use, after the back rib 2 is installed on the stair aluminum formwork body 1, the quadrilateral frame 3 is assembled. The angle adjustment component is used to adjust the angle of the four sides of the quadrilateral frame 3 so that the length of the quadrilateral frame 3 matches the distance between the two back ribs 2. The quadrilateral frame 3 is then installed on the two back ribs 2. First, the position adjustment component is used to adjust the installation position on the step plate assembly 4, and then the step plate assembly 4 is installed on the corresponding quadrilateral frame 3. After installation, this device can not only enhance the strength of the aluminum formwork but also simplify the installation and disassembly process, extending the service life of the stair aluminum formwork body 1.

[0032] Reference Figure 4 and Figure 5 The quadrilateral frame 3 includes two first connecting plates 5 and two second connecting plates 6. Two connecting rods 7 are rotatably connected between the two first connecting plates 5 and the two second connecting plates 6. The back rib 2 has a first strip opening 8. The two first connecting plates 5 are respectively fixedly installed to the corresponding back rib 2 by first bolts 9 and first nuts 10. When it is necessary to adjust the angle of the four sides of the quadrilateral frame 3, the connecting rods 7 rotate between the first connecting plates 5 and the second connecting plates 6, thereby changing the distance between the two first connecting plates 5 so that the distance between the two first connecting plates 5 matches the distance between the first strip openings 8 on the two back ribs 2. The quadrilateral frame 3 is installed on the back rib 2 by the first bolts 9 and the first nuts 10.

[0033] Reference Figure 1 and Figure 3 The step plate assembly 4 includes a first step plate 11, a plurality of second step plates 12, and a third step plate 13. Four fixing plates 14 are fixedly connected to one side wall of the first step plate 11, one side wall of the third step plate 13, and two side walls of the second step plate 12. Adjacent first step plates 11, second step plates 12, and third step plates 13 are connected by fixing plates 14 and telescopic components 15. After the quadrilateral frame 3 is installed on the back rib 2, the first step plate 11, the plurality of second step plates 12, and the third step plate 13 are installed on the quadrilateral frame 3. When the step plate assembly 4 is disassembled for storage, due to the rotatable connection between the fixing plates 14 and the telescopic components 15, the first step plate 11, the plurality of second step plates 12, and the third step plate 13 can be folded and stacked together, so that the step plate assembly 4 occupies less space and is convenient for storage.

[0034] Reference Figure 3 , Figure 4 and Figure 7 Each of the first step plate 11, the second step plate 12, and the third step plate 13 has two second strip-shaped openings 16. A movable plate 17 is slidably connected within the second strip-shaped opening 16. A third strip-shaped opening 18 is provided on the connecting rod 7. The connecting rod 7 is fixedly installed to the first step plate 11, the second step plate 12, and the third step plate 13 by the movable plate 17, the second bolt 19, and the second nut 20. The movable plate 17 is limited to a certain position in the second strip-shaped opening 16 by the position adjustment component. This position allows the second bolt 19 to pass through the third strip-shaped opening 18 and the second strip-shaped opening 16 in sequence. Then, the step plate assembly 4 is installed on the quadrilateral frame 3 by the second nut 20.

[0035] Reference Figure 5The angle adjustment assembly includes two movable blocks 21 slidably connected to the first connecting plate 5, a first spring 22 fixed between the two movable blocks 21, a limiting rack 23 fixed on the movable blocks 21, and multiple toothed grooves 24 opened at both ends of the connecting rod 7, with the limiting rack 23 meshing with the toothed grooves 24.

[0036] A threaded rod 25 is rotatably connected to the first connecting plate 5. A knob is fixed to one end of the threaded rod 25. A rectangular plate 26 is threadedly connected to the surface of the threaded rod 25. Two guide rods 27 that slide through the rectangular plate 26 are fixed to the first connecting plate 5. An extrusion plate 28 is fixed to the rectangular plate 26. The moving block 21 has an arc surface. The two side walls of the extrusion plate 28 abut against the arc surfaces of the two moving blocks 21. When it is necessary to adjust the angle of the connecting rod 7 on the quadrilateral frame 3, rotating the knob drives the threaded rod 25 to rotate. The threaded rod 25 drives the rectangular plate 26 to move. The rectangular plate 26 drives the extrusion plate 28 to move. 8. Movement causes the pressing plate 28 to not contact the arc surfaces of the two moving blocks 21. Under the action of the first spring 22, the two moving blocks 21 move towards the middle. The moving blocks 21 drive the limiting rack 23 away from the tooth groove 24, so that the limiting rack 23 releases the limiting of the connecting rod 7, allowing the connecting rod 7 to rotate between the first connecting plate 5 and the second connecting plate 6. After adjustment, rotating the knob drives the threaded rod 25 to rotate, so that the pressing plate 28 presses the two moving blocks 21 to both sides. The moving blocks 21 drive the limiting rack 23 to move towards the tooth groove 24. The limiting rack 23 is inserted into the tooth groove 24 to limit the angle of the connecting rod 7.

[0037] Reference Figure 6The telescopic assembly 15 includes a rotating block 29 rotatably connected between fixed plates 14. A contraction groove 30 is formed within the rotating block 29. A sliding column 31 is slidably inserted between two corresponding contraction grooves 30. A first cavity 32 is formed within the sliding column 31. A movable column 33 is slidably inserted onto the sliding column 31. One end of the movable column 33 is fixedly connected to a horizontal plate 34 slidably connected within the first cavity 32. A second spring 35 is fixedly connected between the horizontal plate 34 and the inner wall of the first cavity 32. Insert plates 36 are fixedly connected to both ends of the horizontal plate 34. Multiple slots 37 are formed on the inner wall of the contraction groove 30, and the insert plate 36 is inserted into one of the slots 37. When the length of the stair aluminum formwork body 1 changes, the number of second step plates 12 can be increased or decreased to make the overall length of the step plate assembly 4 adapt to the stair aluminum formwork body 1. When it is necessary to fine-tune the length of the step plate assembly 4, the length of the telescopic assembly 15 can be adjusted. Press the moving column 33, and the moving column 33 drives the horizontal plate 34 and the insert plate 36 to move. The second spring 35 is compressed, causing the insert plate 36 to leave the slot 37, releasing the limit between the sliding column 31 and the rotating block 29, changing the length of the sliding column 31 in the contraction groove 30, releasing the moving column 33, and under the action of the second spring 35, the insert plate 36 is inserted into the slot 37 to limit the telescopic assembly 15.

[0038] Reference Figure 7 and Figure 8 The position adjustment assembly includes a rectangular groove 47 formed in the second strip opening 16. A movable plate 17 is slidably connected within the rectangular groove 47. A second cavity 38 is formed within the movable plate 17. A rotating column 39 is threadedly connected within the movable plate 17. A rotating block 40 is fixedly connected to one end of the rotating column 39. A cross groove is formed on the rotating block 40. An extrusion block 41 located within the second cavity 38 is fixedly connected to the outer wall of the rotating column 39. A rod 42, in contact with the extrusion block 41, is slidably inserted into the movable plate 17. A third cavity 43 is formed within the movable plate 17. A circular plate 44 is fixedly connected to the outer wall of the rod 42. A third spring 45 is fixedly connected between the inner wall of the third cavity 43 and the circular plate 44. The side wall of the rectangular groove 47 is... Multiple insertion holes 46 are provided, and the insertion rod 42 is inserted into one of the insertion holes 46. When it is necessary to adjust the position of the movable plate 17 on the step plate to match the third slot 18 of the connecting rod 7, the rotating block 40 is rotated with a Phillips screwdriver. The rotating block 40 drives the rotating column 39 to rotate, and the rotating column 39 drives the pressing block 41 to rotate and move upward in the second cavity 38. Under the action of the third spring 45, the rotating pressing block 41 can make the insertion rod 42 move towards the rotating column 39, so that the insertion rod 42 leaves the insertion hole 46, and the movable plate 17 can move in the rectangular slot 47. After moving to the corresponding position, the rotating block 40 is rotated in the opposite direction to drive the rotating column 39 to rotate, and the rotating column 39 drives the pressing block 41 to rotate, so that the pressing block 41 can press the insertion rod 42 into the insertion hole 46.

[0039] Working principle: In use, after the back ribs 2 are installed on the main body 1 of the stair aluminum formwork, the quadrilateral frame 3 is assembled. The angle adjustment component is used to adjust the angles of the four sides of the quadrilateral frame 3 so that the length of the quadrilateral frame 3 matches the distance between the two back ribs 2. The quadrilateral frame 3 is then installed onto the two back ribs 2. First, the position adjustment component is used to adjust the installation position on the step plate assembly 4, and then the step plate assembly 4 is installed on the corresponding quadrilateral frame 3. After installation, this device can both enhance the strength of the aluminum formwork and simplify the installation and disassembly process, extending the service life of the main body 1 of the stair aluminum formwork. When it is necessary to adjust the four sides of the quadrilateral frame 3... When the angle is adjusted, the connecting rod 7 rotates between the first connecting plate 5 and the second connecting plate 6, thereby changing the distance between the two first connecting plates 5 so that the distance between the two first connecting plates 5 matches the distance between the first strip openings 8 on the two back ribs 2. The quadrilateral frame 3 is then installed on the back rib 2 using the first bolt 9 and the first nut 10. After the quadrilateral frame 3 is installed on the back rib 2, the first step plate 11, multiple second step plates 12, and the third step plate 13 are installed on the quadrilateral frame 3. When the step plate assembly 4 is disassembled for storage, the rotatable connection between the fixing plate 14 and the telescopic assembly 15 allows it to be... The first step plate 11, multiple second step plates 12, and the third step plate 13 are folded and stacked together, making the step plate assembly 4 occupy less space and convenient for storage. The moving plate 17 is limited to a certain position of the second slot 16 by the position adjustment component. This position allows the second bolt 19 to pass through the third slot 18 and the second slot 16 in sequence. Then, the step plate assembly 4 is installed on the quadrilateral frame 3 by the second nut 20. When it is necessary to adjust the angle of the connecting rod 7 on the quadrilateral frame 3, rotating the knob drives the threaded rod 25 to rotate. The threaded rod 25 drives the rectangular plate 26 to move. The rectangular plate 26 drives the pressing plate 28. The movement prevents the extrusion plate 28 from contacting the arc surfaces of the two moving blocks 21. Under the action of the first spring 22, the two moving blocks 21 move towards the center. The moving blocks 21 drive the limiting rack 23 away from the tooth groove 24, so that the limiting rack 23 releases its restriction on the connecting rod 7, allowing the connecting rod 7 to rotate between the first connecting plate 5 and the second connecting plate 6. After adjustment, rotating the knob drives the threaded rod 25 to rotate, causing the extrusion plate 28 to press the two moving blocks 21 to both sides. The moving blocks 21 drive the limiting rack 23 to move towards the tooth groove 24. The limiting rack 23 is inserted into the tooth groove 24 to limit the angle of the connecting rod 7.When the length of the stair aluminum formwork body 1 changes, the number of second step plates 12 can be increased or decreased to make the overall length of the step plate assembly 4 adapt to the stair aluminum formwork body 1. When it is necessary to fine-tune the length of the step plate assembly 4, the length of the telescopic assembly 15 can be adjusted. Pressing the moving column 33 causes the horizontal plate 34 and the insert plate 36 to move, compressing the second spring 35, causing the insert plate 36 to leave the slot 37, releasing the limit between the sliding column 31 and the rotating block 29, changing the length of the sliding column 31 in the contraction groove 30, releasing the moving column 33, and under the action of the second spring 35, the insert plate 36 is inserted into the slot 37, limiting the telescopic assembly 15. When it is necessary to adjust the position of the movable plate 17 on the step plate to fit the third slot 18 of the connecting rod 7, use a Phillips screwdriver to rotate the rotating block 40. The rotating block 40 drives the rotating column 39 to rotate, and the rotating column 39 drives the pressing block 41 to rotate and move upward in the second cavity 38. Under the action of the third spring 45, the rotating pressing block 41 can move the insertion rod 42 towards the rotating column 39, so that the insertion rod 42 leaves the insertion hole 46, and the movable plate 17 can move in the rectangular slot 47. After moving to the corresponding position, rotate the rotating block 40 in the opposite direction to drive the rotating column 39 to rotate, and the rotating column 39 drives the pressing block 41 to rotate, so that the pressing block 41 can press the insertion rod 42 into the insertion hole 46.

[0040] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0041] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A retractable, adjustable, and detachable device for reinforcing aluminum formwork for stairs, comprising a stair formwork body (1) and two back ribs (2), wherein the two back ribs (2) are fixedly installed on the stair formwork body (1), characterized in that, Multiple quadrilateral frames (3) are provided between the two back ribs (2), and step plate assemblies (4) are provided on the quadrilateral frames (3), and the system further includes: An angle adjustment component is provided on the quadrilateral frame (3), which is used to adjust the angle of each side of the quadrilateral frame (3); A position adjustment component is provided on the step plate assembly (4), which is used to adjust the installation position of the step plate assembly (4) and the quadrilateral frame (3); The quadrilateral frame (3) includes two first connecting plates (5) and two second connecting plates (6). Two connecting rods (7) are rotatably connected between the two first connecting plates (5) and the two second connecting plates (6). A first strip opening (8) is provided on the back rib (2). The two first connecting plates (5) are fixedly installed to the corresponding back rib (2) by a first bolt (9) and a first nut (10). The step plate assembly (4) includes a first step plate (11), a plurality of second step plates (12) and a third step plate (13). Four fixing plates (14) are fixedly connected to one side wall of the first step plate (11), one side wall of the third step plate (13) and two side walls of the second step plate (12). Adjacent first step plates (11), second step plates (12) and third step plates (13) are connected by fixing plates (14) and telescopic components (15). The angle adjustment assembly includes two movable blocks (21) slidably connected to the first connecting plate (5), a first spring (22) is fixed between the two movable blocks (21), a limiting rack (23) is fixed on the movable blocks (21), and multiple toothed grooves (24) are opened at both ends of the connecting rod (7), and the limiting rack (23) meshes with the toothed grooves (24). A threaded rod (25) is rotatably connected to the first connecting plate (5). A knob is fixed to one end of the threaded rod (25). A rectangular plate (26) is threadedly connected to the surface of the threaded rod (25). Two guide rods (27) that slide through the rectangular plate (26) are fixed to the first connecting plate (5). An extrusion plate (28) is fixed to the rectangular plate (26). An arc surface is provided on the moving block (21). The two side walls of the extrusion plate (28) abut against the arc surfaces of the two moving blocks (21).

2. The telescopic, adjustable, and detachable device for reinforcing aluminum formwork of stairs according to claim 1, characterized in that, Two second slots (16) are opened on the first step plate (11), the second step plate (12) and the third step plate (13). A movable plate (17) is slidably connected in the second slot (16). A third slot (18) is opened on the connecting rod (7). The connecting rod (7) is fixedly installed with the first step plate (11), the second step plate (12) and the third step plate (13) through the movable plate (17), the second bolt (19) and the second nut (20).

3. The telescopic, adjustable, and detachable device for reinforcing aluminum formwork of stairs according to claim 2, characterized in that, The telescopic assembly (15) includes a rotating block (29) rotatably connected between the fixed plates (14). The rotating block (29) has a shrinkage groove (30) and a sliding column (31) is slidably inserted between two shrinkage grooves (30). The sliding column (31) has a first cavity (32) and a moving column (33) is slidably inserted on the sliding column (31). One end of the moving column (33) is fixedly connected to a horizontal plate (34) slidably connected in the first cavity (32). A second spring (35) is fixedly connected between the horizontal plate (34) and the inner wall of the first cavity (32). Insert plates (36) are fixedly connected to both ends of the horizontal plate (34). The inner wall of the shrinkage groove (30) has multiple slots (37) and the insert plate (36) is inserted into one of the slots (37).

4. The telescopic, adjustable, and detachable device for reinforcing aluminum formwork of stairs according to claim 3, characterized in that, The position adjustment assembly includes a rectangular groove (47) formed in the second slot (16). The movable plate (17) is slidably connected in the rectangular groove (47). A second cavity (38) is formed in the movable plate (17). A rotating column (39) is threadedly connected in the movable plate (17). A rotating block (40) is fixedly connected to one end of the rotating column (39). A cross groove is formed on the rotating block (40). The outer wall of the rotating column (39) is fixedly connected to a part located in the second cavity (38). The extrusion block (41) has a sliding insert rod (42) that contacts the extrusion block (41) inside the moving plate (17). The moving plate (17) has a third cavity (43). A circular plate (44) is fixed to the outer wall of the insert rod (42). A third spring (45) is fixed between the inner wall of the third cavity (43) and the circular plate (44). The side wall of the rectangular groove (47) has multiple insertion holes (46). The insert rod (42) is inserted into one of the insertion holes (46).

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