Simple cast-in-place pile reinforcement cage machining platform

Abstract

The utility model relates to the technical field of building construction auxiliary equipment, in particular to a simple cast-in-place pile reinforcement cage machining platform which comprises positioning assemblies, supporting assemblies and an adjusting track, the positioning assemblies are arranged at the two ends of the adjusting track respectively, and a plurality of supporting assemblies are arranged between the two positioning assemblies at equal intervals. The positioning assembly and the supporting assembly are both in sliding connection with the adjusting rail and are in fastening connection through bolts, the number of components is small, all the components are small in occupied area and convenient to use in a construction site, the positions of the main ribs and the reinforcing ribs are determined through the positioning assembly and the supporting assembly, the positioning effect is good, cooperation of multiple persons is not needed, and the labor intensity of workers is relieved. And meanwhile, compared with manual control positioning, positioning is more accurate, the machining precision of the cast-in-place pile reinforcement cage is improved, the design requirement is better met, the limiting ring can be rotated, workers can conveniently weld and fix main ribs and reinforcing ribs at different positions, machining of the workers is facilitated, and the machining efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of building construction auxiliary equipment, in particular to a simple cast-in-place pile reinforcement cage processing platform. Background Art

[0002] During the construction of bridges, culverts or high-rise buildings, bored piles are generally required. Bored piles are drilled on site using a machine. When the hole depth reaches the design requirement, a steel cage is placed in the corresponding pile hole, and then a guide tube is inserted to pour concrete. The steel cage constrains the concrete of the pile body, allowing the concrete to withstand a certain axial tension.

[0003] In the prior art, some cast-in-place pile steel cages are mainly manufactured by workers at the construction site. The existing steel cages are processed and placed on simple brackets for welding. The annular reinforcement bars need to be measured and marked in advance for welding positions before being welded with the main bars. The entire process requires workers' support and manual control. Due to the long length of the cast-in-place pile steel cages, the main bars may deviate and the positioning accuracy cannot meet the design requirements. In addition, multiple workers are required to cooperate, the processing efficiency is low, and the operation is relatively complicated. Utility Model Content

[0004] The main purpose of the utility model is to provide a simple cast-in-place pile reinforcement cage processing platform, which can effectively solve the above-mentioned problems.

[0005] The utility model provides the following technical scheme: a simple bored pile steel cage processing platform for fixing the positions of main bars and reinforcing bars, characterized in that: it comprises a positioning assembly, a support assembly and an adjustment track, positioning assemblies are respectively arranged at both ends of the adjustment track, a plurality of support assemblies are equidistantly arranged between the two positioning assemblies, the positioning assembly and the support assembly are both arranged on the adjustment track, the positioning assembly and the support assembly are both slidably connected to the adjustment track and fastened by bolts, the positioning assembly comprises a support frame, a main bar limiting frame, a reinforcing bar support frame and a reinforcing bar limiting clamp, a main bar limiting frame is movably arranged on one side of the support frame, a retractable reinforcing bar support frame is fixedly arranged on the other side of the support frame, two symmetrical reinforcing bar limiting clamps are fixedly arranged above the support frame, the reinforcing bar limiting clamps are connected or separated from both sides of the reinforcing bar, and the reinforcing bar support frame is connected or separated from the bottom of the reinforcing bar.

[0006] Furthermore, a semicircular notch is provided in the upper part of the support plate, an arc-shaped sliding groove is provided at the notch, the limiting ring is arranged in the sliding groove, the limiting ring is rotatably connected to the sliding groove, a plurality of evenly arranged positioning holes are provided on the limiting ring, and the main reinforcement passes through the positioning holes and is plugged into the limiting ring.

[0007] Furthermore, the main reinforcement limiting frame includes a first hydraulic cylinder, a first piston rod, a sliding plate, a column and a first limiting block, one end of the first piston rod is slidably connected to the first hydraulic cylinder, the middle part of the other end of the first piston rod passes through the support frame and is fixedly connected to the sliding plate, the two ends of the sliding plate are respectively slidably connected to the two sides of the support frame, one end of the column is fixedly connected to the sliding plate, the other end of the column is fixedly connected to the first limiting block, and a first groove is arranged above the first limiting block, and the first groove contacts or separates from the main reinforcement.

[0008] Furthermore, a plurality of columns are provided, and the top ends of the plurality of columns are arranged along an arc trajectory. The plurality of first limit blocks are all located below the reinforcing ribs, and the plurality of first limit blocks cooperate to limit the main ribs along the direction of fitting the edges of the reinforcing ribs.

[0009] Furthermore, the main reinforcement limiting frame also includes a fixed plate, a connecting plate and a telescopic rod. The connecting plates are vertically fixed at both ends of the lower part of the support frame, and the lower parts of the two connecting plates are respectively connected to the two ends of the fixed plate. The first hydraulic cylinder is fixedly arranged in the middle of the fixed plate, and the telescopic rod is arranged on each side of the first hydraulic cylinder. The fixed end of the telescopic rod is fixedly arranged on the fixed plate, and the movable end of the telescopic rod is fixedly connected to the sliding plate through the support frame.

[0010] Furthermore, the reinforcement rib support frame includes a second hydraulic cylinder, a second piston rod and a second limit block. The second hydraulic cylinder is fixedly arranged in the middle of the support frame, one end of the second piston rod is slidably connected to the second hydraulic cylinder, and the other end of the second piston rod is fixedly provided with a second limit block. A second groove is arranged above the second limit block, and the second limit block contacts or separates from the lower part of the reinforcement rib through the second groove.

[0011] Furthermore, the reinforcing rib limit clamp includes a limit block, a damping hinge and a connecting block. The fixed block, the damping hinge and the connecting block are each provided with two, and the fixed block and the connecting block are respectively fixedly connected to the two ends of the damping hinge. The two connecting blocks are symmetrically fixed on both sides above the support frame, and the rotation angle of the damping hinge is 90 degrees to 100 degrees.

[0012] Furthermore, the positioning assembly also includes a first bracket, and the two ends below the support plate are respectively plugged into the upper ends of the two first brackets, and the lower end of the first bracket is plugged into and slidably connected to the adjustment track.

[0013] Furthermore, the support assembly also includes a second bracket, and the two ends of the lower side of the support bracket are respectively plugged into the upper ends of the two second brackets, and the lower end of the second bracket is plugged into and slidably connected to the adjustment rail.

[0014] Furthermore, the adjustment track includes a track and a bolt, two of the tracks are arranged in parallel, the track is plugged in and slidably connected to the first bracket and the second bracket, a plurality of fixing holes are equidistantly arranged on the track, the bolt passes through the fixing holes and is threadedly connected to the track, and the bolt can abut and lock with the first bracket and the second bracket.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] 1. In the utility model, the simple cast-in-place pile reinforcement cage processing platform includes a positioning component, a supporting component and a sliding component, which has few components, each component occupies a small space, has low requirements on the use environment, and is convenient to use at the construction site.

[0017] 2. In the utility model, the simple bored pile reinforcement cage processing platform determines the positions of the main reinforcement and the reinforcing ribs through the positioning components and the support components, has a good positioning effect, does not require the cooperation of multiple people, reduces the labor intensity of workers, and is more accurate than manual control positioning, improves the processing accuracy of the bored pile reinforcement cage, and better meets the design requirements.

[0018] 3. In the utility model, the simple cast-in-place pile reinforcement cage processing platform can make it more convenient for workers to weld and fix the main reinforcement and reinforcing reinforcement at different positions by rotating the limit ring, which is easy to operate and can improve the processing efficiency.

[0019] 4. In the utility model, the positioning assembly and the supporting assembly of the simple cast-in-place pile reinforcement cage processing platform are plugged into and slidably connected to the adjustment track, which is not only convenient for setting the spacing distance of the reinforcement bars according to the length of the reinforcement cage, but also convenient for disassembling the processing platform after all the main bars and reinforcement bars are welded. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model is further described below in conjunction with the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the structure of a simple cast-in-place pile reinforcement cage processing platform according to an embodiment of the utility model;

[0022] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0023] Figure 3 This is a schematic diagram of the disassembly of the positioning component according to the embodiment of the utility model;

[0024] Figure 4 This is a schematic diagram of the support assembly described in an embodiment of the utility model;

[0025] Figure 5 This is a schematic diagram of a main reinforcement limit frame in a support assembly according to an embodiment of the utility model;

[0026] Figure 6 It is a schematic diagram of a reinforcing rib support frame and a reinforcing rib limiting clamp in a support assembly according to an embodiment of the utility model;

[0027] Figure 7 for Figure 6 Enlarged view of point B in the middle.

[0028] 1. Positioning assembly; 11. Support plate; 111. Sliding groove; 12. Limiting ring; 121. Positioning hole; 13. First bracket; 2. Support assembly; 21. Support frame; 22. Main rib limiting frame; 221. First hydraulic cylinder; 222. First piston rod; 223. Sliding plate; 224. Column; 225. First limiting block; 226. Fixed plate; 227. Connecting plate; 228. Telescopic rod; 23. Reinforcement rib support frame; 231. Second hydraulic cylinder; 232. Second piston rod; 233. Second limiting block; 24. Reinforcement rib limiting clip; 241. Positioning block; 242. Damping hinge; 243. Connecting block; 25. Second bracket; 3. Adjustment track; 31. Track; 311. Fixing hole; 32. Bolt; 4. Main rib; 5. Reinforcement rib. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] In the following description of the utility model, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. The term "connection" only indicates the connection between devices and has no special meaning.

[0031] In addition, the technical fields and installation methods involved in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0032] Specific implementation examples Figure 1-6As shown: a simple cast-in-place pile steel cage processing platform, used for welding the main bars 4 and reinforcing bars 5 of the steel cage, including a positioning component 1, a support component 2 and an adjustment track 3, positioning components 1 are respectively provided at both ends of the adjustment track 3, a plurality of support components 2 are equidistantly arranged between the two positioning components 1, the positioning component 1 and the support component 2 are both arranged on the adjustment track 3, the positioning component 1 and the support component 2 are both slidably connected to the adjustment track 3 and fastened by bolts 32, the processing platform has few components, each component occupies a small space, has low requirements on the construction environment, and is convenient to use at the construction site.

[0033] Furthermore, the positioning assembly 1 includes a support plate 11, a limiting ring 12 and a first bracket 13. A semicircular notch is provided on the upper portion of the support plate 11, and an arc-shaped sliding groove 111 is provided at the notch. The limiting ring 12 is arranged in the sliding groove 111, and the limiting ring 12 is rotatably connected to the sliding groove 111. The upper ends of the two first brackets 13 are respectively plugged into the two ends below the support plate 11, and the lower end of the first bracket 13 is plugged and slidably connected to the adjustment rail 3. The limiting ring 12 is provided with a plurality of evenly distributed positioning holes 121, and the end of the main reinforcement 4 passes through the positioning hole 121 and is plugged into the limiting ring 12. The position of the main reinforcement 4 can be more accurately positioned through the limiting ring 12 and the positioning hole 121, and the positioning effect is high. No need for multiple people to cooperate, which reduces the labor intensity of workers. At the same time, the limiting ring 12 can rotate to facilitate workers to weld and fix the main reinforcement 4 and the reinforcing ribs 5 at different positions, which is easy to operate and can improve processing efficiency.

[0034] The support assembly 2 includes a support frame 21, a main reinforcement limiting frame 22, a reinforcement supporting frame 23, a reinforcement limiting clamp 24 and a second bracket 25. The support frame 21 is a semi-enclosed structure. A main reinforcement limiting frame 22 is movably provided on one side of the support frame 21, and the main reinforcement limiting frame 22 can limit the position of the main reinforcement 4. A reinforcement supporting frame 23 is fixedly provided in the middle of the other side of the support frame 21. Two symmetrical reinforcement limiting clamps 24 are fixedly provided above the support frame 21. The reinforcement limiting clamps 24 are connected or separated from both sides of the reinforcement 5, and the reinforcement supporting frame 23 is connected or separated from the bottom of the reinforcement 5. The reinforcement supporting frame 23 and the reinforcement limiting clamp 24 limit the reinforcement 5. The two ends below the support frame 21 are respectively plugged into the upper ends of the two second brackets 25, and the lower end of the second bracket 25 is plugged into and slidably connected to the adjustment track 3. The support assembly 2 can determine the positions of the main reinforcement 4 and the reinforcement 5, and is more accurate than manual control positioning, improves the processing accuracy of the cast-in-place pile steel cage, and better meets the design requirements.

[0035] The main reinforcement limit frame 22 includes a first hydraulic cylinder 221, a first piston rod 222, a sliding plate 223, a column 224, a first limit block 225, a fixed plate 226 and a connecting plate 227. Connecting plates 227 are vertically fixedly arranged on both sides below the support frame 21. The two connecting plates 227 are arranged on the inner sides of the two second brackets 25. The lower parts of the two connecting plates 227 are respectively connected to the two ends of the fixed plate 226. The first hydraulic cylinder 221 is fixedly arranged in the middle of the fixed plate 226. One end of the first piston rod 222 is slidably connected to the first hydraulic cylinder 221. The other end of the plug rod 222 passes through the support frame 21 and is fixedly connected to the sliding plate 223. The two ends of the sliding plate 223 are respectively slidably connected to the two sides of the support frame 21. One end of the column 224 is vertically fixedly connected to the sliding plate 223. The other end of the column 224 is fixedly connected to the first limit block 225. A first groove is provided above the first limit block 225. The first limit block 225 contacts or separates from the main rib 4 through the first groove. The position of the main rib 4 is fixed by the first limit block 225, which can prevent the longer main rib 4 from bending and deforming, resulting in inaccurate positioning accuracy with the reinforcing rib 5.

[0036] There are multiple columns 224, which are spaced apart at the upper end of the sliding plate 223, and the top ends of the multiple columns 224 are arranged along an arc track. The multiple first limit blocks 225 are all located below the reinforcing rib 4. The multiple first limit blocks 225 cooperate to limit the main rib 4 along the direction of fitting the edge of the reinforcing rib 5.

[0037] The main reinforcement limiting frame 22 also includes a telescopic rod 228, the fixed end of the telescopic rod 228 is fixedly set on the fixed plate 226, the telescopic end of the telescopic rod 228 passes through the support frame 21 and is fixedly connected to the sliding plate 223, and one telescopic rod 228 is set on each side of the first hydraulic cylinder 221. The telescopic rod 228 can assist in supporting the sliding plate 223 to make it slide more smoothly.

[0038] The reinforcement rib support frame 23 includes a second hydraulic cylinder 231, a second piston rod 232 and a second limit block 233. The second hydraulic cylinder 231 is fixedly arranged on the support frame 21. One end of the second piston rod 232 is slidably connected to the second hydraulic cylinder 231. The other end of the second piston rod 232 is fixedly provided with a second limit block 233. A second groove is arranged above the second limit block 233. The second limit block 233 contacts or separates from the lower part of the reinforcement rib 5 through the second groove. When the second limit block 233 contacts the reinforcement rib 5, it can support the reinforcement rib 5. When the second limit block 233 is separated from the reinforcement rib 5, it can avoid the main rib 4 when rotating during the welding process of the steel cage.

[0039] The reinforcing rib limiting clamp 24 includes a positioning block 241, a damping hinge 242 and a connecting block 243. The positioning block 241, the damping hinge 242 and the connecting block 243 are each provided with two. The positioning block 241 and the connecting block 243 are respectively fixedly connected to the two ends of the damping hinge 242. The two connecting blocks 243 are symmetrically fixedly arranged on both sides above the support frame 21. The damping hinge 242 can be opened 90 degrees to 100 degrees. After the damping hinge 242 is closed, the reinforcing rib 5 can be clamped and fixed. After opening, it will not affect the rotation of the main rib 4 and can avoid the main rib 4. The damping hinge 242 adopts a damping shaft, has a certain clamping force, and can be stopped at any position. This technology is a prior art and will not be repeated here.

[0040] The adjustment track 3 includes a track 31 and a bolt 32. Two tracks 31 are arranged in parallel. The track 31 is plugged into and slidably connected with the first bracket 13 and the second bracket 25. A plurality of fixing holes 311 are equidistantly arranged on the track 31. The bolts 32 pass through the fixing holes 311 and are threadedly connected to the track 31. The bolts 32 can be abutted and locked with the first bracket 13 or the second bracket 25, so as to fix the positions of the support assembly 2 and the positioning assembly 1 and prevent them from moving during welding and fixing. It is also convenient to adjust the spacing of the reinforcing ribs 5 when making steel cages of different lengths, and it is also convenient to install all the main bars 4, so that the steel cage can be removed from the processing platform after welding.

[0041] When a simple cast-in-place pile reinforcement cage processing platform is used, the positioning assembly 1 and the support assembly 2 are placed at the appropriate position of the track 31, and then the bolts 32 are turned to fix the positions of the support assembly 2 and the positioning assembly 1, and the two ends of part of the main reinforcement 4 are inserted into the positioning holes 121 of the limiting ring 12, and then the first hydraulic cylinder 221 is started to lift the first limiting block 225 to a suitable height, so that the first limiting block 225 contacts the main reinforcement 4 for support, and the lower part of the reinforcing rib 5 is placed on the second limiting block 233, and the second hydraulic cylinder 231 is started to lift the second limiting block 233 to a suitable position, so that the second limiting block 233 and the main reinforcement 4 are in contact with each other. The contact of the reinforcing rib 5 can support the lower end of the reinforcing rib 5. The reinforcing rib limiting clamp 24 is opened to clamp the two ends of the reinforcing rib 5. Then the worker welds the main rib 4 and multiple reinforcing ribs 5 to fix them. After welding of some main ribs 4 and reinforcing ribs 5 is completed, the reinforcing rib limiting clamp 24 is opened, and the first hydraulic cylinder 221 and the second hydraulic cylinder 231 are started to lower the main rib limiting frame 22 and the reinforcing rib support frame 23, so that the first limiting block 225 and the second limiting block 233 are separated from the main rib 4 and the reinforcing rib 5, and the limiting ring 12 is rotated to continue to insert the remaining main ribs 4 and repeat the above process until all the main ribs 4 and the reinforcing ribs 5 are connected.

Claims

1. A simple cast-in-place pile reinforcement cage processing platform, used for welding the main reinforcement (4) and reinforcing reinforcement (5) of the reinforcement cage, characterized in that: The invention comprises a positioning assembly (1), a supporting assembly (2) and an adjusting track (3), wherein the positioning assemblies (1) are respectively arranged at both ends of the adjusting track (3), a plurality of supporting assemblies (2) are equidistantly arranged between the two positioning assemblies (1), the positioning assembly (1) and the supporting assembly (2) are both arranged on the adjusting track (3), the positioning assembly (1) and the supporting assembly (2) are both slidably connected to the adjusting track (3) and are fastened by bolts (32), the positioning assembly (1) comprises a supporting plate (11) and a limiting ring (12), the supporting plate (11) is rotatably connected to the limiting ring (12), and the limiting ring (12) is connected to the adjusting track (3). The ends of the main ribs (4) are plugged in, and the support assembly (2) comprises a support frame (21), a main rib limiting frame (22), a reinforcing rib support frame (23) and a reinforcing rib limiting clamp (24); one side of the support frame (21) is movably provided with a main rib limiting frame (22); the other side of the support frame (21) is fixedly provided with a retractable reinforcing rib support frame (23); two symmetrical reinforcing rib limiting clamps (24) are fixedly provided above the support frame (21); the reinforcing rib limiting clamps (24) are connected or separated from the two sides of the reinforcing rib (5); and the reinforcing rib support frame (23) is connected or separated from the bottom of the reinforcing rib (5).

2. A simple cast-in-place pile reinforcement cage processing platform according to claim 1, characterized in that: A semicircular notch is provided on the upper part of the support plate (11), an arc-shaped sliding groove (111) is provided at the notch, the limiting ring (12) is arranged in the sliding groove (111), the limiting ring (12) is rotatably connected to the sliding groove (111), a plurality of evenly arranged positioning holes (121) are provided on the limiting ring (12), and the main rib (4) passes through the positioning holes (121) and is plugged into the limiting ring (12).

3. A simple cast-in-place pile reinforcement cage processing platform according to claim 1, characterized in that: The main reinforcement limiting frame (22) comprises a first hydraulic cylinder (221), a first piston rod (222), a sliding plate (223), a column (224) and a first limiting block (225); one end of the first piston rod (222) is slidably connected to the first hydraulic cylinder (221); the middle of the other end of the first piston rod (222) passes through the support frame (21) and is fixedly connected to the sliding plate (223); the two ends of the sliding plate (223) are respectively slidably connected to the two sides of the support frame (21); one end of the column (224) is fixedly connected to the sliding plate (223); the other end of the column (224) is fixedly connected to the first limiting block (225); a first groove is arranged above the first limiting block (225); the first groove is in contact with or separated from the main reinforcement (4).

4. A simple cast-in-place pile reinforcement cage processing platform according to claim 3, characterized in that: A plurality of upright posts (224) are provided, and the top ends of the plurality of upright posts (224) are arranged along an arc track. The plurality of first limit blocks (225) are all located below the reinforcing rib (5), and the plurality of first limit blocks (225) cooperate to limit the main rib (4) in a direction that fits the edge of the reinforcing rib (5).

5. The simple cast-in-place pile reinforcement cage processing platform according to claim 3 is characterized by: The main reinforcement limiting frame (22) also includes a fixed plate (226), a connecting plate (227) and a telescopic rod (228). The connecting plates (227) are respectively vertically fixedly arranged at both ends below the support frame (21). The lower parts of the two connecting plates (227) are respectively connected to the two ends of the fixed plate (226). The first hydraulic cylinder (221) is fixedly arranged in the middle of the fixed plate (226). The telescopic rod (228) is respectively arranged on both sides of the first hydraulic cylinder (221). The fixed end of the telescopic rod (228) is fixedly arranged on the fixed plate (226), and the movable end of the telescopic rod (228) is fixedly connected to the sliding plate (223) passing through the support frame (21).

6. A simple cast-in-place pile reinforcement cage processing platform according to claim 1, characterized in that: The reinforcing rib support frame (23) comprises a second hydraulic cylinder (231), a second piston rod (232) and a second limit block (233); the second hydraulic cylinder (231) is fixedly arranged on the support frame (21); one end of the second piston rod (232) is slidably connected to the second hydraulic cylinder (231); the other end of the second piston rod (232) is fixedly arranged with a second limit block (233); a second groove is arranged above the second limit block (233); the second limit block (233) contacts or separates from the lower part of the reinforcing rib (5) through the second groove.

7. The simple cast-in-place pile reinforcement cage processing platform according to claim 1 is characterized by: The reinforcing rib limiting clamp (24) comprises a positioning block (241), a damping hinge (242) and a connecting block (243); two of each of the positioning block (241), the damping hinge (242) and the connecting block (243) are provided; the positioning block (241) and the connecting block (243) are respectively fixedly connected to two ends of the damping hinge (242); the two connecting blocks (243) are symmetrically fixedly arranged on both sides above the support frame (21); and the damping hinge (242) can be opened 90 to 100 degrees.

8. The simple cast-in-place pile reinforcement cage processing platform according to claim 1 is characterized by: The positioning assembly (1) further comprises a first bracket (13), the two lower ends of the support plate (11) are respectively plugged into the upper ends of the two first brackets (13), and the lower end of the first bracket (13) is plugged into and slidably connected to the adjustment track (3).

9. A simple cast-in-place pile reinforcement cage processing platform according to claim 8, characterized in that: The support assembly (2) further comprises a second bracket (25), the lower ends of the support bracket (21) are respectively plugged into the upper ends of the two second brackets (25), and the lower ends of the second brackets (25) are plugged into and slidably connected to the adjustment rail (3).

10. A simple cast-in-place pile reinforcement cage processing platform according to claim 9, characterized in that: The adjustment track (3) comprises a track (31) and a bolt (32). Two of the tracks (31) are arranged in parallel. The tracks (31) are plugged and slidably connected to the first bracket (13) and the second bracket (25). A plurality of fixing holes (311) are equidistantly arranged on the track (31). The bolt (32) passes through the fixing holes (311) and is threadedly connected to the track (31). The bolt (32) can be abutted and locked with the first bracket (13) and the second bracket (25).

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