A recyclable universal back rib and installation method

Abstract

The present invention relates to the field of building technology, and discloses a recyclable universal back rib and installation method, wherein a recyclable universal back rib comprises: two back rib main bodies and a connection frame, the back rib main body comprises two curved beams, a plurality of connecting plates are welded between the two curved beams, the curved beams, the connecting plates and the connection frame are all made of steel; the ends of the two back rib main bodies close to each other are slidably connected to the outside of the connection frame, and an adjustment mechanism is arranged inside the connection frame. The present invention is reasonably designed, and the back rib is made of steel, so that the back rib has extremely high strength and load-bearing capacity, and the installation mechanism can be used to conveniently and quickly realize the installation of the back rib, and the installation method is highly universal, so that it can be applied to different usage scenarios, convenient for the recycling of the back rib, and in line with the concept of green construction, and the length of the back rib can be adjusted according to needs through the adjustment mechanism, which improves the flexibility and adaptability of construction.

Description

Technical Field

[0001] The invention relates to the technical field of construction, and in particular to a recyclable universal back rib and an installation method thereof. Background Art

[0002] In modern construction, wooden or steel back ribs are an important part of the formwork support system and are widely used in the forming process of various concrete structures. Traditional back ribs have problems such as large loss, low reuse rate, and inconvenient installation and disassembly during use, which not only increases the project cost, but also affects the construction efficiency and environmental sustainability. In addition, the installation method used by traditional back ribs is prone to loosening and it is not convenient to adjust the length according to actual needs. Due to the complexity and diversity of building structures, fixed-length back ribs cannot be assembled into any required structure through simple connectors, which limits its versatility and flexibility in different projects. Therefore, we propose a recyclable universal back rib and installation method to solve this problem. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings of low reuse rate, low installation stability and non-adjustable length of traditional back ribs, and to propose a recyclable universal back rib and installation method.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A recyclable universal back rib, comprising: two back rib main bodies and a connection frame, wherein the back rib main bodies comprise two curved beams, a plurality of connecting plates are welded between the two curved beams, and the curved beams, connecting plates and connection frames are all made of steel;

[0006] The ends of the two back rib bodies that are close to each other are both slidably connected to the outside of the connection frame, and an adjustment mechanism is provided inside the connection frame;

[0007] A mounting mechanism is provided at the other end of the back-rib main body, and the mounting mechanism includes a tension bolt, a movable seat, a positioning seat and a tension nut. The tension nut is threadedly sleeved on the outer side of the tension bolt, and the movable seat is slidably connected to the back-rib main body, and a hexagonal table is fixedly connected to the movable seat, the positioning seat is slidably sleeved on the outer side of the hexagonal table, and a hexagonal hole is opened on the positioning seat, the tension nut is movably inserted in the hexagonal hole, and the tension bolt passes through the middle of the movable seat.

[0008] Preferably, the movable seat is fixedly connected to a fixed shaft, a positioning head is rotatably sleeved on the fixed shaft, a torsion spring is fixedly connected to the positioning head, the rear end of the torsion spring is fixedly connected to the movable seat, and the positioning head movably abuts against the rear side of the positioning seat, and a through hole adapted to the positioning head is opened on the positioning seat, the positioning head can be aligned with the through hole after rotating ninety degrees around the fixed shaft, and a limiting head is integrally formed at the front end of the fixed shaft, and the limiting head movably abuts against the positioning head.

[0009] Preferably, a guide column is fixedly connected to the movable seat, and the positioning seat is slidably sleeved on the outer side of the guide column;

[0010] A guide rail is integrally formed on one side of the two curved beams that are close to each other, and the movable seat is slidably sleeved on the outer sides of the two guide rails;

[0011] The connecting plate is provided with a plug hole, the movable seat and the hexagonal table are provided with through holes, and the tension bolts penetrate the corresponding plug holes and through holes.

[0012] Preferably, the adjustment mechanism comprises a rotating shaft, two side plates and four transverse plates, the rotating shaft is rotatably installed in the connecting frame, the two side plates close to each other are hinged with arc-shaped connecting rods, the outer side of the rotating shaft is fixedly sleeved with a rotating disk, the rotating disk is fixedly connected with two round rods, the other end of the arc-shaped connecting rod is rotatably sleeved on the outer side of the corresponding round rod, and the side plates and the transverse plates are slidably connected in the connecting frame, and the two side plates away from each other are fixedly connected with inclined plates;

[0013] An inclined hole is provided on one side of the transverse plate, and the inclined plate is slidably connected in the corresponding inclined hole, and the two transverse plates on the same side are fixedly connected with a plurality of positioning columns on the sides away from each other, and a plurality of positioning holes are provided on the top and bottom of the curved beam, and the plurality of positioning holes are evenly arranged at equal intervals, and the positioning columns are movably inserted in the corresponding positioning holes.

[0014] Preferably, vertical rails are fixedly connected to the inner walls on both the front and rear sides of the connection frame, the horizontal plates are slidably sleeved on the outer sides of the corresponding vertical rails, and a return spring is fixedly connected between the two horizontal plates on the same side;

[0015] A knob is fixedly connected to the front end of the rotating shaft, and a plurality of vertical holes are provided on the top and the bottom of the connecting frame, and the positioning posts are slidably connected in the corresponding vertical holes.

[0016] The present invention also provides a method for installing the above-mentioned recyclable universal back rib, comprising the following steps:

[0017] S1: Rotating the knob drives the rotating shaft and the turntable to rotate, and drives the two round rods to perform circular motion. The two round rods respectively drive the two side plates to move away from each other through the cooperation with the corresponding arc-shaped connecting rods, and drive the two horizontal plates on the same side to move closer to each other through the cooperation between the inclined plate and the corresponding inclined hole, and drive the positioning column to come out of the positioning hole, release the fixation of the two back rib bodies, and then move the back rib body to adjust its relative position with the connecting frame. After adjusting to the required length, release the knob, so that the horizontal plate is reset under the elastic force of the reset spring, and drive the positioning column to insert into the corresponding positioning hole to fix the back rib body, thereby achieving length fixation;

[0018] S2: Insert the tension bolt through the insertion hole and the through hole, and screw the tension nut on the outside of the tension bolt, control the positioning head to rotate 90 degrees so that the positioning head is aligned with the through hole, push the positioning seat to move backward, so that the positioning head passes through the through hole, and the front end surface of the positioning seat is flush with the front end surface of the hexagonal table, then rotate the tension nut so that it moves along the axial direction of the tension bolt through the threaded engagement with the tension bolt, and abuts on the hexagonal table, and the tension nut is aligned with the hexagonal hole;

[0019] S3: Pull the locating seat forward to insert the tension nut into the hexagonal hole, fix the angle of the tension nut to prevent loosening, and wait for the locating head to be completely removed from the through hole. The locating head rotates and resets under the elastic force of the torsion spring, and makes the locating head abut against the rear side of the locating seat, thereby limiting the movement of the locating seat to improve the fixing stability of the tension nut and avoid loosening.

[0020] Compared with the prior art, the present invention provides a recyclable universal back rib and installation method, which has the following beneficial effects:

[0021] (1) The back ribs are made of steel, which makes them extremely strong and load-bearing. They can withstand heavy weight and pressure, significantly improving the bearing capacity and earthquake resistance of buildings. The material and structural design of the back ribs made of steel make them stable and not easy to deform or twist. They can remain flat and beautiful during construction, thus improving the quality of decoration. The back ribs made of steel have been specially treated to have good anti-corrosion and anti-rust properties. They can resist erosion from the natural environment in outdoor environments and maintain a long service life. Although the initial investment cost of the back ribs made of steel may be high, their long-term durability and recyclability reduce the overall construction cost.

[0022] (2) The installation mechanism can be used to conveniently and quickly install the back ribs, and the installation is highly stable, which can prevent loosening after installation and improve the stability and safety of use. The design of the installation mechanism makes the installation process of the back ribs simpler and faster, reduces the operation steps and time of workers, and improves the overall construction efficiency. The installation mechanism ensures the close connection between the back ribs and the formwork, improves the stability of the entire formwork system, and avoids the risk of structural deformation or collapse caused by loose back ribs. The design of the installation mechanism takes safety factors into consideration. The locking mechanism formed by the positioning seat and the tension nut prevents the back ribs from loosening during installation or use, thereby reducing safety hazards at the construction site. The stable installation mechanism helps to ensure the dimensional accuracy and surface quality during the concrete pouring process, thereby improving the overall quality of the construction project. Due to the high stability of the installation mechanism, the need for repair and replacement caused by loose back ribs is reduced, thereby reducing long-term maintenance costs. By improving installation efficiency and stability, material waste and energy consumption are reduced. The installation method is highly versatile, so it can be applied to different usage scenarios, facilitating the recycling of back ribs, and conforming to the concept of green construction.

[0023] (3) The length of the back rib can be adjusted as needed through the adjustment mechanism. The adjustable back rib can adapt to building structures of different sizes and shapes, reducing on-site cutting or processing due to back rib length mismatch, thereby saving construction time. Since the adjustable back rib reduces the demand for back ribs of specific sizes, it can reduce inventory costs and material waste. At the same time, it reduces the rework and repair costs caused by inappropriate back rib length. The adjustable back rib can be accurately adjusted according to actual needs to ensure the stability and bearing capacity of the formwork system, thereby reducing safety risks during construction. By accurately adjusting the back rib length, the deformation and displacement during concrete pouring can be better controlled, and the quality and appearance of the concrete structure can be improved. The adjustable back rib can adapt to various complex building structures and construction environments, improving the flexibility and adaptability of construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the three-dimensional structure of a recyclable universal back rib proposed by the present invention;

[0025] Figure 2 This is an exploded three-dimensional structural diagram of the back rib main body and the connection frame proposed by the present invention;

[0026] Figure 3 This is a schematic diagram of the front cross-sectional structure of a recyclable universal back rib proposed by the present invention;

[0027] Figure 4 for Figure 3A partial enlarged view of part C in the middle;

[0028] Figure 5 A schematic diagram of the three-dimensional structure of the adjustment mechanism proposed by the present invention;

[0029] Figure 6 A schematic diagram of a top view and cross-sectional structure of a recyclable universal back rib proposed by the present invention;

[0030] Figure 7 A schematic diagram of a side cross-sectional structure of a recyclable universal back rib proposed by the present invention;

[0031] Figure 8 A partial cross-sectional structural schematic diagram of a recyclable universal back rib proposed by the present invention;

[0032] Fig. 9 for Figure 8 A partial enlarged view of part A;

[0033] Fig.10 for Fig. 9 A partial enlarged view of part B;

[0034] Fig.11 This is a schematic diagram of the three-dimensional structure of the installation mechanism proposed by the present invention;

[0035] Fig.12 This is a schematic diagram of the exploded three-dimensional structure of the installation mechanism proposed by the present invention.

[0036] In the figure: 1. back rib body; 101. bent beam; 1011. positioning hole; 102. connecting plate; 1021. jack; 103. guide rail; 2. connecting frame; 201. vertical hole; 3. tension bolt; 4. rotating shaft; 401. knob; 402. turntable; 403. round rod; 404. arc connecting rod; 5. moving seat; 501. hexagonal table; 6. positioning seat; 601. through hole; 602. guide column; 7. tension nut; 8. positioning head; 801. fixed shaft; 802. torsion spring; 9. horizontal plate; 901. positioning column; 902. return spring; 903. inclined plate; 904. side plate; 905. vertical rail. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0038] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0039] Reference Figure 1-12 A recyclable universal back rib, comprising: two back rib main bodies 1 and a connection frame 2, the back rib main body 1 comprising two curved beams 101, a plurality of connecting plates 102 are welded between the two curved beams 101, the curved beams 101, the connecting plates 102 and the connection frame 2 are all made of steel;

[0040] The ends of the two back rib bodies 1 that are close to each other are slidably connected to the outside of the connection frame 2, and an adjustment mechanism is provided inside the connection frame 2;

[0041] A mounting mechanism is provided at the other end of the back-rib main body 1, and the mounting mechanism includes a tension bolt 3, a movable seat 5, a positioning seat 6 and a tension nut 7. The tension nut 7 is threadedly sleeved on the outer side of the tension bolt 3, and the movable seat 5 is slidably connected to the back-rib main body 1, and a hexagonal table 501 is fixedly connected to the movable seat 5, the positioning seat 6 is slidably sleeved on the outer side of the hexagonal table 501, and a hexagonal hole is opened on the positioning seat 6, the tension nut 7 is movably inserted in the hexagonal hole, and the tension bolt 3 passes through the middle of the movable seat 5.

[0042] In this embodiment, a fixed shaft 801 is fixedly connected to the movable seat 5, a positioning head 8 is rotatably sleeved on the fixed shaft 801, a torsion spring 802 is fixedly connected to the positioning head 8, the rear end of the torsion spring 802 is fixedly connected to the movable seat 5, and the positioning head 8 is movably abutted against the rear side of the positioning seat 6, and a through hole 601 adapted to the positioning head 8 is opened on the positioning seat 6, the positioning head 8 can be aligned with the through hole 601 after rotating ninety degrees around the fixed shaft 801, and a limiting head is integrally formed at the front end of the fixed shaft 801, and the limiting head is movably abutted against the positioning head 8.

[0043] In this embodiment, the movable seat 5 is fixedly connected with a guide column 602, and the positioning seat 6 is slidably sleeved on the outer side of the guide column 602, thereby guiding the positioning seat 6; the two curved beams 101 are both integrally formed with a guide rail 103 on the side close to each other, and the movable seat 5 is slidably sleeved on the outer sides of the two guide rails 103, thereby guiding the movable seat 5;

[0044] The connecting plate 102 is provided with an insertion hole 1021 , and the movable seat 5 and the hexagonal platform 501 are both provided with through holes, and the tension bolts 3 penetrate through the corresponding insertion holes 1021 and the through holes.

[0045] In this embodiment, the adjustment mechanism includes a rotating shaft 4, two side plates 904 and four transverse plates 9. The rotating shaft 4 is rotatably installed in the connecting frame 2. The two side plates 904 are hinged with arc-shaped connecting rods 404 on the sides close to each other. A rotating disk 402 is fixedly sleeved on the outer side of the rotating shaft 4. Two round rods 403 are fixedly connected to the rotating disk 402. The other end of the arc-shaped connecting rod 404 is rotatably sleeved on the outer side of the corresponding round rod 403. The side plates 904 and the transverse plates 9 are slidably connected in the connecting frame 2. The two side plates 904 are fixedly connected with inclined plates 903 on the sides away from each other.

[0046] An inclined hole is provided on one side of the cross plate 9, and the inclined plate 903 is slidably connected in the corresponding inclined hole, and the two cross plates 9 on the same side are fixedly connected on the sides away from each other with a number of positioning columns 901, and the top and bottom of the curved beam 101 are provided with a plurality of positioning holes 1011, and the plurality of positioning holes 1011 are evenly arranged at equal intervals, and the positioning columns 901 are movably inserted in the corresponding positioning holes 1011.

[0047] In this embodiment, vertical rails 905 are fixedly connected to the inner walls of both the front and rear sides of the connection frame 2, and the horizontal plates 9 are slidably sleeved on the outer sides of the corresponding vertical rails 905. A return spring 902 is fixedly connected between the two horizontal plates 9 on the same side;

[0048] A knob 401 is fixedly connected to the front end of the rotating shaft 4 , and a plurality of vertical holes 201 are provided on the top and bottom of the connecting frame 2 , and the positioning posts 901 are slidably connected in the corresponding vertical holes 201 .

[0049] The present invention also provides a method for installing the above-mentioned recyclable universal back rib, comprising the following steps:

[0050] S1: Rotating the knob 401 drives the rotating shaft 4 and the rotating disk 402 to rotate, and drives the two round rods 403 to perform circular motion. The two round rods 403 respectively drive the two side plates 904 to move away from each other through the cooperation with the corresponding arc-shaped connecting rods 404, and drive the two horizontal plates 9 on the same side to move closer to each other through the cooperation between the inclined plate 903 and the corresponding inclined hole, and drive the positioning column 901 to come out of the positioning hole 1011, thereby releasing the fixation of the two back-stitching main bodies 1, and then the back-stitching main body 1 can be moved to adjust its relative position with the connecting frame 2. After adjusting to the required length, the knob 401 is released, so that the horizontal plate 9 is reset under the elastic force of the reset spring 902, and the positioning column 901 is driven to be inserted into the corresponding positioning hole 1011 to fix the back-stitching main body 1, thereby achieving length fixation;

[0051] S2: Insert the tension bolt 3 through the insertion hole 1021 and the through hole, and screw the tension nut 7 on the outside of the tension bolt 3, control the positioning head 8 to rotate 90 degrees, so that the positioning head 8 is aligned with the through hole 601, push the positioning seat 6 to move backward, so that the positioning head 8 passes through the through hole 601, and the front end surface of the positioning seat 6 is flush with the front end surface of the hexagonal table 501, then rotate the tension nut 7, so that it moves along the axial direction of the tension bolt 3 through the threaded engagement with the tension bolt 3, and abuts on the hexagonal table 501, and the tension nut 7 is aligned with the hexagonal hole;

[0052] S3: Pull the positioning seat 6 forward so that the tension nut 7 is inserted into the hexagonal hole, fixing the angle of the tension nut 7 to prevent loosening. When the positioning head 8 is completely disengaged from the through hole 601, the positioning head 8 rotates and resets under the elastic force of the torsion spring 802, and makes the positioning head 8 abut against the rear side of the positioning seat 6, thereby limiting the movement of the positioning seat 6 to improve the fixing stability of the tension nut 7 and avoid loosening.

[0053] In the present embodiment, the back ribs are made of steel, so that the back ribs have extremely high strength and load-bearing capacity, can withstand greater weight and pressure, and significantly improve the bearing capacity and earthquake resistance of the building. The material and structural design of the back ribs made of steel give them good stability. The installation mechanism provided can conveniently and quickly realize the installation of the back ribs, and the installation stability is high, which can prevent loosening after the installation is completed, thereby improving the stability and safety of use. The design of the installation mechanism makes the installation process of the back ribs simpler and faster, reduces the operation steps and time of the workers, and improves the overall construction efficiency. The installation mechanism ensures a close connection between the back ribs and the formwork, improves the stability of the entire formwork system, and avoids the risk of structural deformation or collapse caused by loose back ribs. Due to the high stability of the installation mechanism, the risk of collapse caused by loose back ribs is reduced. The need for repair and replacement caused by movement, thereby reducing long-term maintenance costs, reducing material waste and energy consumption by improving installation efficiency and stability, and the installation method is highly versatile, so it can be applied to different usage scenarios, facilitating the recycling of back ribs, and conforming to the concept of green construction. The length of the back ribs can be adjusted according to needs through the set adjustment mechanism. The adjustable length back ribs can adapt to building structures of different sizes and shapes, reducing on-site cutting or processing due to back rib length mismatch, thereby saving construction time. Since the adjustable length back ribs reduce the need for specific size back ribs, it can reduce inventory costs and material waste, improve the quality and appearance of concrete structures, and the adjustable length back ribs can adapt to various complex building structures and construction environments, improving the flexibility and adaptability of construction.

[0054] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the instructions and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. Machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

Claims

1. A recyclable universal back rib, characterized in that: include: Two back-rib main bodies (1) and a connection frame (2), wherein the back-rib main body (1) comprises two curved beams (101), a plurality of connecting plates (102) are welded between the two curved beams (101), and the curved beams (101), the connecting plates (102) and the connection frame (2) are all made of steel; The ends of the two back rib bodies (1) that are close to each other are slidably connected to the outside of the connection frame (2), and an adjustment mechanism is provided inside the connection frame (2); The other end of the back-ribbed body (1) is provided with a mounting mechanism, the mounting mechanism comprising a tension bolt (3), a movable seat (5), a positioning seat (6) and a tension nut (7), the tension nut (7) being threadedly sleeved on the outer side of the tension bolt (3), the movable seat (5) being slidably connected to the back-ribbed body (1), and a hexagonal table (501) being fixedly connected to the movable seat (5), the positioning seat (6) being slidably sleeved on the outer side of the hexagonal table (501), and a hexagonal hole being formed on the positioning seat (6), the tension nut (7) being movably inserted into the hexagonal hole, and the tension bolt (3) passing through the middle of the movable seat (5); The movable seat (5) is fixedly connected to a fixed shaft (801), a positioning head (8) is rotatably sleeved on the fixed shaft (801), a torsion spring (802) is fixedly connected to the positioning head (8), a rear end of the torsion spring (802) is fixedly connected to the movable seat (5), and the positioning head (8) is movably abutted against the rear side of the positioning seat (6), and a through hole (601) adapted to the positioning head (8) is provided on the positioning seat (6), the positioning head (8) is aligned with the through hole (601) after rotating ninety degrees around the fixed shaft (801), a limiting head is integrally formed at the front end of the fixed shaft (801), and the limiting head is movably abutted against the positioning head (8); The movable seat (5) is fixedly connected to a guide column (602), and the positioning seat (6) is slidably sleeved on the outer side of the guide column (602); A guide rail (103) is integrally formed on one side of the two curved beams (101) that are close to each other, and the movable seat (5) is slidably sleeved on the outer sides of the two guide rails (103); The connecting plate (102) is provided with a plug hole (1021), the movable seat (5) and the hexagonal table (501) are both provided with through holes, and the tension bolts (3) are inserted into the corresponding plug holes (1021) and through holes; The adjustment mechanism comprises a rotating shaft (4), two side plates (904) and four transverse plates (9); the rotating shaft (4) is rotatably mounted in the connecting frame (2); the sides of the two side plates (904) close to each other are hinged with arc-shaped connecting rods (404); a rotating disk (402) is fixedly sleeved on the outer side of the rotating shaft (4); two round rods (403) are fixedly connected to the rotating disk (402); the other end of the arc-shaped connecting rod (404) is rotatably sleeved on the outer side of the corresponding round rod (403); the side plates (904) and the transverse plates (9) are slidably connected in the connecting frame (2); and the sides of the two side plates (904) away from each other are fixedly connected with inclined plates (903).

2. The recyclable universal back rib according to claim 1, characterized in that: An inclined hole is provided on one side of the transverse plate (9), the inclined plate (903) is slidably connected in the corresponding inclined hole, and two transverse plates (9) located on the same side are fixedly connected to a plurality of positioning columns (901) on the sides away from each other, and a plurality of positioning holes (1011) are provided on the top and bottom of the curved beam (101), the plurality of positioning holes (1011) are evenly arranged at equal intervals, and the positioning columns (901) are movably plugged into the corresponding positioning holes (1011).

3. The recyclable universal back rib according to claim 2, characterized in that: Vertical rails (905) are fixedly connected to the inner walls on both the front and rear sides of the connection frame (2); the horizontal plates (9) are slidably sleeved on the outer sides of the corresponding vertical rails (905); and a return spring (902) is fixedly connected between the two horizontal plates (9) on the same side; A knob (401) is fixedly connected to the front end of the rotating shaft (4), and a plurality of vertical holes (201) are provided on the top and bottom of the connecting frame (2), and the positioning columns (901) are slidably connected in the corresponding vertical holes (201).

4. A method for installing a recyclable universal back rib according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1: Rotating the knob (401) drives the rotating shaft (4) and the rotating disk (402) to rotate, and drives the two round rods (403) to perform circular motion. The two round rods (403) respectively drive the two side plates (904) to move away from each other through the cooperation with the corresponding arc-shaped connecting rods (404), and drive the two horizontal plates (9) located on the same side to move closer to each other through the cooperation between the inclined plate (903) and the corresponding inclined hole, and drive the positioning column (901) to come out of the positioning hole (1011), thereby releasing the fixation of the two back corrugated bodies (1), and then the back corrugated body (1) can be moved to adjust its relative position with the connecting frame (2). After adjusting to the required length, the knob (401) is released, so that the horizontal plate (9) is reset under the elastic force of the reset spring (902), and the positioning column (901) is driven to be inserted into the corresponding positioning hole (1011) to fix the back corrugated body (1), thereby achieving length fixation; S2: insert the tension bolt (3) through the insertion hole (1021) and the through hole, and screw the tension nut (7) onto the outside of the tension bolt (3), control the positioning head (8) to rotate 90 degrees so that the positioning head (8) is aligned with the through hole (601), push the positioning seat (6) to move backward, so that the positioning head (8) passes through the through hole (601), and the front end surface of the positioning seat (6) is flush with the front end surface of the hexagonal table (501), and then rotate the tension nut (7) so that it moves along the axial direction of the tension bolt (3) through the thread engagement with the tension bolt (3), and abuts against the hexagonal table (501), and the tension nut (7) is aligned with the hexagonal hole; S3: Pull the positioning seat (6) forward so that the tension nut (7) is inserted into the hexagonal hole, and the angle of the tension nut (7) is fixed to prevent loosening. When the positioning head (8) is completely removed from the through hole (601), the positioning head (8) rotates and resets under the elastic force of the torsion spring (802), and the positioning head (8) abuts against the rear side of the positioning seat (6), thereby limiting the movement of the positioning seat (6) to improve the fixing stability of the tension nut (7) and prevent loosening.

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