A quick-release steel frame structure for a farm and a method of use

Abstract

The application discloses a quick-release type steel frame structure for a farm, which comprises a horizontal rod and a plurality of U-shaped steel frames, the U-shaped steel frames are arranged in parallel in sequence, the horizontal rod is fixed with the U-shaped steel frames, and quick-release structures are connected to the two ends of the U-shaped steel frames respectively. Compared with the traditional steel frame structure, the quick-release type steel frame structure for the farm changes the vertical installation mode of the traditional steel frame structure, so that the U-shaped steel frame can be installed horizontally, and then is rotated to be vertical, thereby reducing the labor loss in the installation process. When the U-shaped steel frame is disassembled, the U-shaped steel frame is rotated to change from the vertical state to the horizontal state. In this process, the limiting rod for fixing the U-shaped steel frame is separated from the blind hole at the two ends of the U-shaped steel frame by a length, so that the U-shaped steel frame and the limiting rod are separated, and thus the U-shaped steel frame is convenient to disassemble, and the difficulty of rust removal work on the steel frame structure is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of quick-release steel frame structure, in particular to a quick-release steel frame structure for a farm and a use method thereof. BACKGROUND

[0002] The existing farm is built by a steel frame structure. Since the farm is located outdoors, it is subjected to wind, rain and sun all year round, which causes the steel frame structure to rust easily. Therefore, the steel frame structure needs to be treated for rust after being built for several years. Since the existing steel frame structure of the farm is not convenient to disassemble, it brings great difficulty to the rust removal work. Therefore, the present application provides a quick-release steel frame structure for a farm and a use method thereof. SUMMARY

[0003] The present application aims to provide a quick-release steel frame structure for a farm and a use method thereof to solve the problems in the background art.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a quick-release steel frame structure for a farm, comprising a horizontal rod and a plurality of U-shaped steel frames, the plurality of U-shaped steel frames are arranged in parallel in sequence, the horizontal rod is fixed with the plurality of U-shaped steel frames, and the two ends of the U-shaped steel frame are respectively connected with a quick-release structure, the quick-release structure comprises:

[0005] an arc-shaped plate, which is in an inclined "C" shape structure;

[0006] a support rod, which is located at the center of the arc-shaped plate and is parallel to the arc-shaped plate;

[0007] a support, which is used to support the support rod, and the support rod is rotationally connected with respect to the support, and the support is fixed on the arc-shaped plate;

[0008] a fixing device, which is used to support and fix the U-shaped steel frame;

[0009] the fixing device comprises:

[0010] a threaded pipe, which is perpendicular and penetrates through the support rod, and the threaded pipe is fixedly connected with the support rod;

[0011] a screw rod, which is located in the interior of the threaded pipe and is threadedly connected with the threaded pipe;

[0012] a limiting rod, which is fixed at one end of the screw rod, and the two ends of the U-shaped steel frame are respectively provided with a blind hole, and the two ends of the U-shaped steel frame are respectively inserted into the limiting rods of the two groups of fixing devices through the blind holes;

[0013] an anti-rotation assembly, which is used to limit the rotation of the screw rod with respect to the threaded pipe;

[0014] The quick release structure further comprises a driving assembly for driving the threaded pipe to rotate.

[0015] Preferably, the driving assembly comprises a driving rod, a rotating shaft, a driving gear, an arc-shaped toothed plate and a transmission assembly, one end of the driving rod is fixed with the supporting rod, the other end of the driving rod is provided with a through slot, the driving gear is located in the through slot, the driving gear is rotatably connected with the driving rod through the rotating shaft, the driving gear is meshingly connected with the arc-shaped toothed plate, the arc-shaped toothed plate is fixed on the arc-shaped plate, and the driving gear drives the threaded pipe to rotate through the transmission assembly.

[0016] Preferably, the transmission assembly comprises a first bevel gear and a second bevel gear, the first bevel gear is fixed on the end of the rotating shaft located outside the driving rod, and the first bevel gear is meshingly connected with the second bevel gear, and the second bevel gear is fixedly sleeved outside the threaded pipe.

[0017] Preferably, the quick release structure further comprises a U-shaped reinforcing steel frame located inside the U-shaped steel frame, each quick release structure is provided with two fixing devices, and each quick release structure further comprises a synchronous assembly for driving the threaded pipes of the two fixing devices to synchronously rotate, the two ends of the U-shaped reinforcing steel frame are respectively inserted on the limiting rods of the two groups of fixing devices, and the synchronous assembly comprises a gear chain and two synchronous gears, the two synchronous gears are transmissionally connected through the gear chain, and the two synchronous gears are respectively fixedly sleeved on the two threaded pipes.

[0018] Preferably, the quick release structure further comprises a reinforcing rib, and the two ends of the reinforcing rib are respectively fixed with the U-shaped steel frame and the U-shaped reinforcing steel frame.

[0019] Preferably, the anti-rotation assembly comprises an anti-rotation rod, a sliding rod and an arc-shaped strip, the middle part of the screw rod is provided with a through hole matched with the anti-rotation rod, at least one plane is arranged on the side surface of the anti-rotation rod, one end of the anti-rotation rod is slidingly inserted in the through hole, the sliding rod is fixed on the end of the anti-rotation rod located outside the through hole, the arc-shaped strip is fixed on the arc-shaped plate, and the arc-shaped strip is provided with an arc-shaped groove, and the end of the sliding rod is slidingly inserted in the arc-shaped groove.

[0020] Preferably, the arc-shaped strip is provided with two groups in parallel, and the two ends of the sliding rod are respectively slidingly inserted in the arc-shaped grooves of the two groups of arc-shaped strips.

[0021] Preferably, the bracket is fixed with a bearing seat, and the two ends of the supporting rod are respectively rotatably connected with the bearing seat.

[0022] Preferably, the angle between one end of the arc-shaped plate and the vertical direction is α, and the α is 10°-80°.

[0023] The application discloses a method for using a quick-release steel frame structure for a farm, and relates to the field of steel frame structures.

[0024] S11, rotating the driving rod, so that the limiting rod is in a horizontal state, and the two ends of the U-shaped steel frame and the U-shaped reinforcing steel frame are respectively inserted into corresponding limiting rods;

[0025] S12, rotating the U-shaped steel frame and the U-shaped reinforcing steel frame so that they gradually change from the horizontal state to a vertical state; in the rotating process, the limiting rod is caused to increase in length by being inserted into the U-shaped steel frame and the U-shaped reinforcing steel frame under the action of the driving assembly and the transmission assembly;

[0026] S13, after the U-shaped steel frame and the U-shaped reinforcing steel frame are rotated to the vertical state, the plurality of U-shaped steel frames are fixed through the cross rod;

[0027] The method further comprises a dismounting method, and the dismounting method comprises the following steps:

[0028] S21, dismounting the cross rod from the plurality of U-shaped steel frames;

[0029] S22, rotating the U-shaped steel frame and the U-shaped reinforcing steel frame so that they change from the vertical state to the horizontal state; in this process, the limiting rod for fixing the U-shaped steel frame is caused to be separated from the blind hole at the two ends of the U-shaped steel frame by a length;

[0030] S23, pulling the U-shaped steel frame so that the U-shaped steel frame and the U-shaped reinforcing steel frame are separated from the limiting rod.

[0031] Compared with the prior art, the method has the following beneficial effects:

[0032] The quick-release steel frame structure for a farm changes the vertical installation mode of a traditional steel frame structure, so that the U-shaped steel frame can be installed horizontally, and then rotated to be vertical, thereby reducing the labor loss in the installation process; when dismounting, the U-shaped steel frame is rotated to change from the vertical state to the horizontal state; in this process, the limiting rod for fixing the U-shaped steel frame is separated from the blind hole at the two ends of the U-shaped steel frame by a length, so that the U-shaped steel frame is separated from the limiting rod, thereby facilitating the dismounting of the U-shaped steel frame and reducing the difficulty of rust removal work on the steel frame structure. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is a schematic diagram of the whole structure of the application;

[0034] Figure 2 It is a schematic diagram of the U-shaped reinforcing steel frame structure of the application;

[0035] Figure 3 It is a schematic diagram of the quick-release structure of the application;

[0036] Figure 4 Structure diagram of the anti-rotation assembly of the application;

[0037] Figure 5 Figure 3 Enlarged view of area A;

[0038] Figure 6 Figure 4 Enlarged view of area B;

[0039] Figure 7 Figure 5 Enlarged view of area C;

[0040] Figure 8 Position diagram of the included angle α.

[0041] In the figure: 1, crossbar; 2, U-shaped steel frame; 3, quick-release structure; 4, arc-shaped plate; 5, support rod; 6, support; 7, fixing device; 8, threaded pipe; 9, screw rod; 10, limiting rod; 11, anti-rotation assembly; 12, driving assembly; 13, driving rod; 14, rotating shaft; 15, driving gear; 16, arc-shaped toothed plate; 17, transmission assembly; 18, through slot; 19, first bevel gear; 20, second bevel gear; 21, U-shaped reinforcing steel frame; 22, synchronization assembly; 23, gear chain; 24, synchronization gear; 25, reinforcing rib; 26, anti-rotation rod; 27, sliding rod; 28, arc-shaped strip; 29, arc-shaped groove; 30, bearing seat; 31, base. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0043] Embodiment one

[0044] Please refer to Figure 1 The embodiment provides a technical solution: a quick-release type steel frame structure for a farm, which comprises a crossbar 1 and a plurality of U-shaped steel frames 2. The plurality of U-shaped steel frames 2 are arranged in parallel in sequence, and the crossbar 1 is fixed with the plurality of U-shaped steel frames 2. The crossbar 1 makes the positions of the plurality of U-shaped steel frames 2 more stable. In order to further reinforce the U-shaped steel frames 2, a plurality of crossbars 1 can be used to fix the U-shaped steel frames 2. The plurality of U-shaped steel frames 2 and the crossbar 1 jointly form a steel frame structure of the farm. In order to facilitate the use of the farm, a rainproof material also needs to be fixed on the steel frame structure.

[0045] ​​​The U-shaped steel frame 2 is connected with quick release structures 3 at two ends, the quick release structures 3 support the U-shaped steel frame 2 and facilitate dismounting of the U-shaped steel frame 2.

[0046] Please refer to Figures 2-3 , the quick release structure 3 comprises an arc-shaped plate 4, the arc-shaped plate 4 is in an inclined "C" shape structure, a support rod 5 is located at the center of the arc-shaped plate 4 and is parallel to the arc-shaped plate 4, a support 6 is used for supporting the support rod 5, the support rod 5 is rotationally connected with the support 6, the support 6 is fixed on the arc-shaped plate 4, a fixing device 7 is used for supporting and fixing the U-shaped steel frame 2, the fixing device 7 comprises a threaded pipe 8, the threaded pipe 8 is perpendicular and penetrates through the support rod 5, the threaded pipe 8 is fixedly connected with the support rod 5, a screw rod 9 is located in the threaded pipe 8 and is threadedly connected with the threaded pipe 8, a limiting rod 10 is fixed at one end of the screw rod 9, both ends of the U-shaped steel frame 2 are provided with blind holes, and both ends of the U-shaped steel frame 2 are inserted into the limiting rods 10 of the two groups of fixing devices 7 through the blind holes, an anti-rotation assembly 11 is used for limiting rotation of the screw rod 9 relative to the threaded pipe 8, the quick release structure 3 further comprises a driving assembly 12, the driving assembly 12 is used for driving the threaded pipe 8 to rotate.

[0047] In the embodiment, the threaded pipe 8 is driven to rotate by the driving assembly 12, under the limiting action of the anti-rotation assembly 11, the screw rod 9 moves in the threaded pipe 8, so that the length of the limiting rod 10 extending out of the threaded pipe 8 is controlled.

[0048] Please refer to Figure 4 , in order to make the limiting rod 10 extend out of the threaded pipe 8 synchronously with the rotation of the U-shaped steel frame 2, a driving mode is disclosed in the embodiment, the driving assembly 12 comprises a driving rod 13, a rotating shaft 14, a driving gear 15, an arc-shaped toothed plate 16 and a transmission assembly 17, the driving rod 13 is parallel to the threaded pipe 8, one end of the driving rod 13 is fixed with the support rod 5, the other end of the driving rod 13 is provided with a through slot 18, the driving gear 15 is located in the through slot 18 and is rotationally connected with the driving rod 13 through the rotating shaft 14, the driving gear 15 is meshingly connected with the arc-shaped toothed plate 16, and the arc-shaped toothed plate 16 is fixed on the arc-shaped plate 4.

[0049] When the U-shaped steel frame 2 is installed and dismounted, the driving rod 13 can be swung with the support rod 5 as the center by rotating the U-shaped steel frame 2, under the action of the arc-shaped toothed plate 16, the driving gear 15 is rotated, the driving gear 15 drives the threaded pipe 8 to rotate through the transmission assembly 17, so that the limiting rod 10 extends out of the threaded pipe 8 synchronously with the rotation of the U-shaped steel frame 2.

[0050] In order to reduce the abrasion of the support rod 5 relative to the support 6 when the support rod 5 rotates, a bearing seat 30 is fixed on the support 6, and the two ends of the support rod 5 are rotatably connected with the bearing seat 30.

[0051] In order to facilitate the fixation of the arc-shaped plate 4, a base 31 is fixed on the bottom of the arc-shaped plate 4, and the base 31 can be pre-buried in the ground or wall.

[0052] Embodiment Two

[0053] Please refer to Figure 5 The difference between the embodiment and the embodiment one is that the embodiment discloses a transmission assembly 17 for stably transmitting power on the basis of the embodiment one, the transmission assembly 17 comprises a first bevel gear 19 and a second bevel gear 20, the first bevel gear 19 is fixed on the end of the rotating shaft 14 outside the driving rod 13, and the first bevel gear 19 is in meshing connection with the second bevel gear 20, and the second bevel gear 20 is fixedly sleeved outside the threaded pipe 8.

[0054] In the transmission process, the rotation of the driving gear 15 drives the rotation of the first bevel gear 19 and the second bevel gear 20, thereby driving the rotation of the threaded pipe 8.

[0055] Embodiment Three

[0056] Please refer to Figures 1-4 The difference between the embodiment and the combination of the embodiment one and the embodiment two is that the embodiment further comprises a U-shaped reinforcing steel frame 21 for the stability of the steel frame structure of the farm on the basis of the embodiment one and the embodiment two, the U-shaped reinforcing steel frame 21 is located on the inner side of the U-shaped steel frame 2, each quick release structure 3 is provided with two fixing devices 7, and each quick release structure 3 further comprises a synchronous assembly 22 for driving the synchronous rotation of the threaded pipes 8 of the two fixing devices 7, the two ends of the U-shaped reinforcing steel frame 21 are respectively inserted into the limiting rods 10 of the two groups of fixing devices 7, the synchronous assembly 22 comprises a gear chain 23 and two synchronous gears 24, the two synchronous gears 24 are in transmission connection through the gear chain 23, and the two synchronous gears 24 are respectively fixedly sleeved on the two threaded pipes 8, and under the action of the two fixing devices 7 and the synchronous assembly 22, the U-shaped steel frame 2 and the U-shaped reinforcing steel frame 21 can synchronously rotate with the support rod 5 as the center, so that the U-shaped reinforcing steel frame 21 does not affect the quick installation and disassembly of the steel frame structure of the farm.

[0057] In order to make the relative positions of the U-shaped steel frame 2 and the U-shaped reinforcing steel frame 21 more stable, the technical scheme disclosed by the embodiment further comprises a reinforcing rib 25, and the two ends of the reinforcing rib 25 are respectively fixed with the U-shaped steel frame 2 and the U-shaped reinforcing steel frame 21.

[0058] Embodiment Four

[0059] Please refer to Figures 4-7 The embodiment discloses a rotation preventing assembly 11 applied to the first embodiment, the rotation preventing assembly 11 comprises a rotation preventing rod 26, a sliding rod 27 and an arc-shaped strip 28, a middle part of the screw rod 9 is provided with a through hole matched with the rotation preventing rod 26, at least one plane is arranged on a side surface of the rotation preventing rod 26, and one end of the rotation preventing rod 26 is slidingly inserted into the through hole, and under the cooperation of the rotation preventing rod 26 and the through hole, the screw rod 9 cannot rotate along with the threaded pipe 8.

[0060] The sliding rod 27 is fixed to one end of the rotation preventing rod 26 located outside the through hole, the arc-shaped strip 28 is fixed to the arc-shaped plate 4, and the arc-shaped strip 28 is provided with an arc-shaped groove 29, and the end of the sliding rod 27 is slidingly inserted into the arc-shaped groove 29, and the sliding rod 27 reduces the abrasion of the rotation preventing rod 26 in the swinging process.

[0061] In order to make the position of the rotation preventing rod 26 more stable, the arc-shaped strips 28 are arranged in parallel in two groups, and the two ends of the sliding rod 27 are slidingly inserted into the arc-shaped grooves 29 of the two groups of arc-shaped strips 28 respectively.

[0062] Embodiment five

[0063] Please refer to Figure 8 The embodiment discloses a new arc-shaped plate 4, in order to make the separation of the U-shaped steel frame 2 and the U-shaped reinforcing steel frame 21 from the limiting rod 10 more labor-saving, an angle between one end of the arc-shaped plate 4 and the vertical direction is α, the α is 10°-80°, so that the U-shaped steel frame 2 and the U-shaped reinforcing steel frame 21 can be ensured to be in an inclined downward state during disassembly, preferably 80°, so that the U-shaped steel frame 2 and the U-shaped reinforcing steel frame 21 are approximately in a horizontal state during installation and disassembly.

[0064] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0065] Although the embodiments of the present application have been shown and described, it should be understood by those ordinary skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A quick-release steel frame structure for a livestock farm, characterized in that: It includes a crossbar (1) and multiple U-shaped steel frames (2), the multiple U-shaped steel frames (2) are arranged in parallel in sequence, the crossbar (1) is fixed to the multiple U-shaped steel frames (2) respectively, and quick-release structures (3) are connected to both ends of the U-shaped steel frames (2), the quick-release structures (3) include: Arc-shaped plate (4), the arc-shaped plate (4) is an inclined "C" shaped structure; Support rod (5), the support rod (5) is located at the center of the arc plate (4) and is parallel to the arc plate (4); A bracket (6) is used to support a support rod (5), and the support rod (5) is rotatably connected relative to the bracket (6). The bracket (6) is fixed on the arc plate (4). Fixing device (7), which is used to support and fix the U-shaped steel frame (2); The fixing device (7) includes: A threaded tube (8) is perpendicular to and passes through the support rod (5), and the threaded tube (8) is fixedly connected to the support rod (5); Screw (9), the screw (9) is located inside the threaded tube (8) and is threadedly connected to the threaded tube (8); Limiting rod (10), the limiting rod (10) is fixed to one end of screw (9), and the two ends of the U-shaped steel frame (2) are respectively provided with blind holes, and the two ends of the U-shaped steel frame (2) are respectively inserted into the limiting rod (10) of the two sets of fixing devices (7) through the blind holes; Anti-rotation component (11), which is used to limit the rotation of the screw (9) relative to the threaded tube (8); The quick-release structure (3) also includes a drive assembly (12) for driving the threaded tube (8) to rotate; The drive assembly (12) includes a drive rod (13), a rotating shaft (14), a drive gear (15), an arc-shaped toothed plate (16), and a transmission assembly (17). The drive rod (13) is parallel to the threaded tube (8). One end of the drive rod (13) is fixed to the support rod (5). The other end of the drive rod (13) is provided with a through groove (18). The drive gear (15) is located in the through groove (18), and the drive gear (15) is rotatably connected to the drive rod (13) through the rotating shaft (14). The drive gear (15) is meshed with the arc-shaped toothed plate (16). The arc-shaped toothed plate (16) is fixed on the arc-shaped plate (4). The drive gear (15) drives the threaded tube (8) to rotate through the transmission assembly (17). The transmission assembly (17) includes a first bevel gear (19) and a second bevel gear (20). The first bevel gear (19) is fixed to the end of the rotating shaft (14) located outside the drive rod (13), and the first bevel gear (19) meshes with the second bevel gear (20). The second bevel gear (20) is fixedly sleeved on the outside of the threaded tube (8).

2. The quick-release steel frame structure for a livestock farm according to claim 1, characterized in that: It also includes a U-shaped reinforcing steel frame (21), which is located inside the U-shaped steel frame (2). Each quick-release structure (3) is provided with two fixing devices (7), and each quick-release structure (3) also includes a synchronization component (22) for driving the threaded tubes (8) on the two fixing devices (7) to rotate synchronously. The two ends of the U-shaped reinforcing steel frame (21) are respectively inserted into the limiting rods (10) of the two sets of fixing devices (7). The synchronization component (22) includes a gear chain (23) and two synchronization gears (24). The two synchronization gears (24) are connected by the gear chain (23) and are respectively fixedly sleeved on the two threaded tubes (8).

3. The quick-release steel frame structure for a livestock farm according to claim 2, characterized in that: It also includes a reinforcing rib (25), the two ends of which are fixed to the U-shaped steel frame (2) and the U-shaped reinforcing steel frame (21) respectively.

4. A quick-release steel frame structure for a livestock farm according to claim 3, characterized in that: The anti-rotation component (11) includes an anti-rotation rod (26), a sliding rod (27), and an arc-shaped strip (28). The screw (9) has a through hole in the middle that cooperates with the anti-rotation rod (26). The side of the anti-rotation rod (26) has at least one flat surface, and one end of the anti-rotation rod (26) is slidably inserted into the through hole. The sliding rod (27) is fixed at one end of the anti-rotation rod (26) located outside the through hole. The arc-shaped strip (28) is fixed on the arc plate (4), and the arc-shaped strip (28) is provided with an arc groove (29). The end of the sliding rod (27) is slidably inserted into the arc groove (29).

5. A quick-release steel frame structure for a livestock farm according to claim 4, characterized in that: Two sets of arc-shaped bars (28) are arranged in parallel, and the two ends of the slide rod (27) are respectively slidably inserted into the arc grooves (29) of the two sets of arc-shaped bars (28).

6. A quick-release steel frame structure for a livestock farm according to claim 1, characterized in that: The bracket (6) is fixed with a bearing seat (30), and the two ends of the support rod (5) are rotatably connected to the bearing seat (30).

7. A quick-release steel frame structure for a livestock farm according to claim 6, characterized in that: The angle between one end of the arc plate (4) and the vertical direction is α, where α is 10°-80°.

8. A method for using the quick-release steel frame structure for a livestock farm as described in claim 7, characterized in that, The installation method includes the following steps: S11. Rotate the drive rod (13) to make the limit rod (10) horizontal, and insert the two ends of the U-shaped steel frame (2) and the U-shaped reinforcing steel frame (21) into the corresponding limit rod (10); S12. Rotate the U-shaped steel frame (2) and the U-shaped reinforcing steel frame (21) to gradually change them from a horizontal state to a vertical state. During the rotation, the limit rod (10) is extended out of the threaded tube (8) by the drive assembly (12) and the transmission assembly (17), thereby increasing the length of its insertion into the U-shaped steel frame (2) and the U-shaped reinforcing steel frame (21). After S13, U-shaped steel frame (2) and U-shaped reinforced steel frame (21) are rotated to the vertical position, multiple U-shaped steel frames (2) are fixed simultaneously by the crossbar (1); It also includes a disassembly method, which comprises the following steps: S21. Remove the crossbar (1) from the multiple U-shaped steel frames (2); S22. Rotate the U-shaped steel frame (2) and the U-shaped reinforcing steel frame (21) to change them from a vertical state to a horizontal state. During this process, the limiting rod (10) that fixes the U-shaped steel frame (2) is pulled out of the blind holes at both ends of the U-shaped steel frame (2) by a certain length. S23. Pull the U-shaped steel frame (2) to separate the U-shaped steel frame (2) and the U-shaped reinforcing steel frame (21) from the limiting rod (10).

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